Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * PACKET - implements raw packet sockets. |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 11 | * |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 12 | * Fixes: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Alan Cox : verify_area() now used correctly |
| 14 | * Alan Cox : new skbuff lists, look ma no backlogs! |
| 15 | * Alan Cox : tidied skbuff lists. |
| 16 | * Alan Cox : Now uses generic datagram routines I |
| 17 | * added. Also fixed the peek/read crash |
| 18 | * from all old Linux datagram code. |
| 19 | * Alan Cox : Uses the improved datagram code. |
| 20 | * Alan Cox : Added NULL's for socket options. |
| 21 | * Alan Cox : Re-commented the code. |
| 22 | * Alan Cox : Use new kernel side addressing |
| 23 | * Rob Janssen : Correct MTU usage. |
| 24 | * Dave Platt : Counter leaks caused by incorrect |
| 25 | * interrupt locking and some slightly |
| 26 | * dubious gcc output. Can you read |
| 27 | * compiler: it said _VOLATILE_ |
| 28 | * Richard Kooijman : Timestamp fixes. |
| 29 | * Alan Cox : New buffers. Use sk->mac.raw. |
| 30 | * Alan Cox : sendmsg/recvmsg support. |
| 31 | * Alan Cox : Protocol setting support |
| 32 | * Alexey Kuznetsov : Untied from IPv4 stack. |
| 33 | * Cyrus Durgin : Fixed kerneld for kmod. |
| 34 | * Michal Ostrowski : Module initialization cleanup. |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 35 | * Ulises Alonso : Frame number limit removal and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * packet_set_ring memory leak. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
| 38 | * The convention is that longer addresses |
| 39 | * will simply extend the hardware address |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 40 | * byte arrays at the end of sockaddr_ll |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 41 | * and packet_mreq. |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 42 | * Johann Baudy : Added TX RING. |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 43 | * Chetan Loke : Implemented TPACKET_V3 block abstraction |
| 44 | * layer. |
| 45 | * Copyright (C) 2011, <lokec@ccs.neu.edu> |
| 46 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * |
| 48 | * This program is free software; you can redistribute it and/or |
| 49 | * modify it under the terms of the GNU General Public License |
| 50 | * as published by the Free Software Foundation; either version |
| 51 | * 2 of the License, or (at your option) any later version. |
| 52 | * |
| 53 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/mm.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 57 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <linux/fcntl.h> |
| 59 | #include <linux/socket.h> |
| 60 | #include <linux/in.h> |
| 61 | #include <linux/inet.h> |
| 62 | #include <linux/netdevice.h> |
| 63 | #include <linux/if_packet.h> |
| 64 | #include <linux/wireless.h> |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 65 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <linux/kmod.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 67 | #include <linux/slab.h> |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 68 | #include <linux/vmalloc.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 69 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <net/ip.h> |
| 71 | #include <net/protocol.h> |
| 72 | #include <linux/skbuff.h> |
| 73 | #include <net/sock.h> |
| 74 | #include <linux/errno.h> |
| 75 | #include <linux/timer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <asm/uaccess.h> |
| 77 | #include <asm/ioctls.h> |
| 78 | #include <asm/page.h> |
Al Viro | a1f8e7f7 | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 79 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <asm/io.h> |
| 81 | #include <linux/proc_fs.h> |
| 82 | #include <linux/seq_file.h> |
| 83 | #include <linux/poll.h> |
| 84 | #include <linux/module.h> |
| 85 | #include <linux/init.h> |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 86 | #include <linux/mutex.h> |
Eric Dumazet | 05423b2 | 2009-10-26 18:40:35 -0700 | [diff] [blame] | 87 | #include <linux/if_vlan.h> |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 88 | #include <linux/virtio_net.h> |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 89 | #include <linux/errqueue.h> |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 90 | #include <linux/net_tstamp.h> |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 91 | #include <linux/percpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #ifdef CONFIG_INET |
| 93 | #include <net/inet_common.h> |
| 94 | #endif |
| 95 | |
Pavel Emelyanov | 2787b04 | 2012-08-13 05:49:39 +0000 | [diff] [blame] | 96 | #include "internal.h" |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | Assumptions: |
| 100 | - if device has no dev->hard_header routine, it adds and removes ll header |
| 101 | inside itself. In this case ll header is invisible outside of device, |
| 102 | but higher levels still should reserve dev->hard_header_len. |
| 103 | Some devices are enough clever to reallocate skb, when header |
| 104 | will not fit to reserved space (tunnel), another ones are silly |
| 105 | (PPP). |
| 106 | - packet socket receives packets with pulled ll header, |
| 107 | so that SOCK_RAW should push it back. |
| 108 | |
| 109 | On receive: |
| 110 | ----------- |
| 111 | |
| 112 | Incoming, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 113 | mac_header -> ll header |
| 114 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | Outgoing, dev->hard_header!=NULL |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 117 | mac_header -> ll header |
| 118 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | Incoming, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 121 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| 122 | header. PPP makes it, that is wrong, because introduce |
YOSHIFUJI Hideaki | db0c58f | 2007-07-19 10:44:35 +0900 | [diff] [blame] | 123 | assymetry between rx and tx paths. |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 124 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | Outgoing, dev->hard_header==NULL |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 127 | mac_header -> data. ll header is still not built! |
| 128 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | Resume |
| 131 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| 132 | |
| 133 | |
| 134 | On transmit: |
| 135 | ------------ |
| 136 | |
| 137 | dev->hard_header != NULL |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 138 | mac_header -> ll header |
| 139 | data -> ll header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | dev->hard_header == NULL (ll header is added by device, we cannot control it) |
Arnaldo Carvalho de Melo | b0e380b1 | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 142 | mac_header -> data |
| 143 | data -> data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | We should set nh.raw on output to correct posistion, |
| 146 | packet classifier depends on it. |
| 147 | */ |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* Private packet socket structures. */ |
| 150 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 151 | /* identical to struct packet_mreq except it has |
| 152 | * a longer address field. |
| 153 | */ |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 154 | struct packet_mreq_max { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 155 | int mr_ifindex; |
| 156 | unsigned short mr_type; |
| 157 | unsigned short mr_alen; |
| 158 | unsigned char mr_address[MAX_ADDR_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | }; |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 160 | |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 161 | union tpacket_uhdr { |
| 162 | struct tpacket_hdr *h1; |
| 163 | struct tpacket2_hdr *h2; |
| 164 | struct tpacket3_hdr *h3; |
| 165 | void *raw; |
| 166 | }; |
| 167 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 168 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 169 | int closing, int tx_ring); |
| 170 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 171 | #define V3_ALIGNMENT (8) |
| 172 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 173 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 174 | |
| 175 | #define BLK_PLUS_PRIV(sz_of_priv) \ |
| 176 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) |
| 177 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 178 | #define PGV_FROM_VMALLOC 1 |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 179 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 180 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
| 181 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) |
| 182 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) |
| 183 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) |
| 184 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) |
| 185 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) |
| 186 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) |
| 187 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 188 | struct packet_sock; |
| 189 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 190 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 191 | struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 193 | static void *packet_previous_frame(struct packet_sock *po, |
| 194 | struct packet_ring_buffer *rb, |
| 195 | int status); |
| 196 | static void packet_increment_head(struct packet_ring_buffer *buff); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 197 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
| 198 | struct tpacket_block_desc *); |
| 199 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 200 | struct packet_sock *); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 201 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 202 | struct packet_sock *, unsigned int status); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 203 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
| 204 | static void prb_open_block(struct tpacket_kbdq_core *, |
| 205 | struct tpacket_block_desc *); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 206 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 207 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
| 208 | static void prb_init_blk_timer(struct packet_sock *, |
| 209 | struct tpacket_kbdq_core *, |
| 210 | void (*func) (unsigned long)); |
| 211 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); |
| 212 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, |
| 213 | struct tpacket3_hdr *); |
| 214 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, |
| 215 | struct tpacket3_hdr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | static void packet_flush_mclist(struct sock *sk); |
| 217 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 218 | struct packet_skb_cb { |
| 219 | unsigned int origlen; |
| 220 | union { |
| 221 | struct sockaddr_pkt pkt; |
| 222 | struct sockaddr_ll ll; |
| 223 | } sa; |
| 224 | }; |
| 225 | |
| 226 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 227 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 228 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 229 | #define GET_PBLOCK_DESC(x, bid) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 230 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 231 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 232 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 233 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
| 234 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ |
| 235 | ((x)->kactive_blk_num+1) : 0) |
| 236 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 237 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
| 238 | static void __fanout_link(struct sock *sk, struct packet_sock *po); |
| 239 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 240 | static int packet_direct_xmit(struct sk_buff *skb) |
| 241 | { |
| 242 | struct net_device *dev = skb->dev; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 243 | netdev_features_t features; |
| 244 | struct netdev_queue *txq; |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 245 | int ret = NETDEV_TX_BUSY; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 246 | |
| 247 | if (unlikely(!netif_running(dev) || |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 248 | !netif_carrier_ok(dev))) |
| 249 | goto drop; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 250 | |
| 251 | features = netif_skb_features(skb); |
| 252 | if (skb_needs_linearize(skb, features) && |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 253 | __skb_linearize(skb)) |
| 254 | goto drop; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 255 | |
Daniel Borkmann | 10c51b5623 | 2014-08-27 11:11:27 +0200 | [diff] [blame] | 256 | txq = skb_get_tx_queue(dev, skb); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 257 | |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 258 | local_bh_disable(); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 259 | |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 260 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
David S. Miller | 10b3ad8 | 2014-08-29 21:07:24 -0700 | [diff] [blame] | 261 | if (!netif_xmit_frozen_or_drv_stopped(txq)) |
David S. Miller | fa2dbdc2 | 2014-08-29 21:55:22 -0700 | [diff] [blame] | 262 | ret = netdev_start_xmit(skb, dev, txq, false); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 263 | HARD_TX_UNLOCK(dev, txq); |
| 264 | |
| 265 | local_bh_enable(); |
| 266 | |
| 267 | if (!dev_xmit_complete(ret)) |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 268 | kfree_skb(skb); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 269 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 270 | return ret; |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 271 | drop: |
Daniel Borkmann | 0f97ede | 2014-04-02 20:52:56 +0200 | [diff] [blame] | 272 | atomic_long_inc(&dev->tx_dropped); |
Daniel Borkmann | 4327950 | 2014-03-27 16:38:30 +0100 | [diff] [blame] | 273 | kfree_skb(skb); |
| 274 | return NET_XMIT_DROP; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 275 | } |
| 276 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 277 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
| 278 | { |
| 279 | struct net_device *dev; |
| 280 | |
| 281 | rcu_read_lock(); |
| 282 | dev = rcu_dereference(po->cached_dev); |
| 283 | if (likely(dev)) |
| 284 | dev_hold(dev); |
| 285 | rcu_read_unlock(); |
| 286 | |
| 287 | return dev; |
| 288 | } |
| 289 | |
| 290 | static void packet_cached_dev_assign(struct packet_sock *po, |
| 291 | struct net_device *dev) |
| 292 | { |
| 293 | rcu_assign_pointer(po->cached_dev, dev); |
| 294 | } |
| 295 | |
| 296 | static void packet_cached_dev_reset(struct packet_sock *po) |
| 297 | { |
| 298 | RCU_INIT_POINTER(po->cached_dev, NULL); |
| 299 | } |
| 300 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 301 | static bool packet_use_direct_xmit(const struct packet_sock *po) |
| 302 | { |
| 303 | return po->xmit == packet_direct_xmit; |
| 304 | } |
| 305 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 306 | static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 307 | { |
Li Zhong | 1cbac01 | 2013-12-12 22:39:55 +0100 | [diff] [blame] | 308 | return (u16) raw_smp_processor_id() % dev->real_num_tx_queues; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 309 | } |
| 310 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 311 | static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
| 312 | { |
| 313 | const struct net_device_ops *ops = dev->netdev_ops; |
| 314 | u16 queue_index; |
| 315 | |
| 316 | if (ops->ndo_select_queue) { |
| 317 | queue_index = ops->ndo_select_queue(dev, skb, NULL, |
| 318 | __packet_pick_tx_queue); |
| 319 | queue_index = netdev_cap_txqueue(dev, queue_index); |
| 320 | } else { |
| 321 | queue_index = __packet_pick_tx_queue(dev, skb); |
| 322 | } |
| 323 | |
| 324 | skb_set_queue_mapping(skb, queue_index); |
| 325 | } |
| 326 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 327 | /* register_prot_hook must be invoked with the po->bind_lock held, |
| 328 | * or from a context in which asynchronous accesses to the packet |
| 329 | * socket is not possible (packet_create()). |
| 330 | */ |
| 331 | static void register_prot_hook(struct sock *sk) |
| 332 | { |
| 333 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 334 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 335 | if (!po->running) { |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 336 | if (po->fanout) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 337 | __fanout_link(sk, po); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 338 | else |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 339 | dev_add_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 340 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 341 | sock_hold(sk); |
| 342 | po->running = 1; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock |
| 347 | * held. If the sync parameter is true, we will temporarily drop |
| 348 | * the po->bind_lock and do a synchronize_net to make sure no |
| 349 | * asynchronous packet processing paths still refer to the elements |
| 350 | * of po->prot_hook. If the sync parameter is false, it is the |
| 351 | * callers responsibility to take care of this. |
| 352 | */ |
| 353 | static void __unregister_prot_hook(struct sock *sk, bool sync) |
| 354 | { |
| 355 | struct packet_sock *po = pkt_sk(sk); |
| 356 | |
| 357 | po->running = 0; |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 358 | |
| 359 | if (po->fanout) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 360 | __fanout_unlink(sk, po); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 361 | else |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 362 | __dev_remove_pack(&po->prot_hook); |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 363 | |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 364 | __sock_put(sk); |
| 365 | |
| 366 | if (sync) { |
| 367 | spin_unlock(&po->bind_lock); |
| 368 | synchronize_net(); |
| 369 | spin_lock(&po->bind_lock); |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | static void unregister_prot_hook(struct sock *sk, bool sync) |
| 374 | { |
| 375 | struct packet_sock *po = pkt_sk(sk); |
| 376 | |
| 377 | if (po->running) |
| 378 | __unregister_prot_hook(sk, sync); |
| 379 | } |
| 380 | |
Michael S. Tsirkin | 6e58040 | 2014-11-24 13:32:16 +0200 | [diff] [blame] | 381 | static inline struct page * __pure pgv_to_page(void *addr) |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 382 | { |
| 383 | if (is_vmalloc_addr(addr)) |
| 384 | return vmalloc_to_page(addr); |
| 385 | return virt_to_page(addr); |
| 386 | } |
| 387 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 388 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| 389 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 390 | union tpacket_uhdr h; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 391 | |
| 392 | h.raw = frame; |
| 393 | switch (po->tp_version) { |
| 394 | case TPACKET_V1: |
| 395 | h.h1->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 396 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 397 | break; |
| 398 | case TPACKET_V2: |
| 399 | h.h2->tp_status = status; |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 400 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 401 | break; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 402 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 403 | default: |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 404 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 405 | BUG(); |
| 406 | } |
| 407 | |
| 408 | smp_wmb(); |
| 409 | } |
| 410 | |
| 411 | static int __packet_get_status(struct packet_sock *po, void *frame) |
| 412 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 413 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 414 | |
| 415 | smp_rmb(); |
| 416 | |
| 417 | h.raw = frame; |
| 418 | switch (po->tp_version) { |
| 419 | case TPACKET_V1: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 420 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 421 | return h.h1->tp_status; |
| 422 | case TPACKET_V2: |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 423 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 424 | return h.h2->tp_status; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 425 | case TPACKET_V3: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 426 | default: |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 427 | WARN(1, "TPACKET version not supported.\n"); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 428 | BUG(); |
| 429 | return 0; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 430 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 432 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 433 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
| 434 | unsigned int flags) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 435 | { |
| 436 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
| 437 | |
Willem de Bruijn | 68a360e | 2014-07-25 18:01:31 -0400 | [diff] [blame] | 438 | if (shhwtstamps && |
| 439 | (flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
| 440 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) |
| 441 | return TP_STATUS_TS_RAW_HARDWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 442 | |
| 443 | if (ktime_to_timespec_cond(skb->tstamp, ts)) |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 444 | return TP_STATUS_TS_SOFTWARE; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 445 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 446 | return 0; |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 447 | } |
| 448 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 449 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
| 450 | struct sk_buff *skb) |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 451 | { |
| 452 | union tpacket_uhdr h; |
| 453 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 454 | __u32 ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 455 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 456 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
| 457 | return 0; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 458 | |
| 459 | h.raw = frame; |
| 460 | switch (po->tp_version) { |
| 461 | case TPACKET_V1: |
| 462 | h.h1->tp_sec = ts.tv_sec; |
| 463 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
| 464 | break; |
| 465 | case TPACKET_V2: |
| 466 | h.h2->tp_sec = ts.tv_sec; |
| 467 | h.h2->tp_nsec = ts.tv_nsec; |
| 468 | break; |
| 469 | case TPACKET_V3: |
| 470 | default: |
| 471 | WARN(1, "TPACKET version not supported.\n"); |
| 472 | BUG(); |
| 473 | } |
| 474 | |
| 475 | /* one flush is safe, as both fields always lie on the same cacheline */ |
| 476 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); |
| 477 | smp_wmb(); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 478 | |
| 479 | return ts_status; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 480 | } |
| 481 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 482 | static void *packet_lookup_frame(struct packet_sock *po, |
| 483 | struct packet_ring_buffer *rb, |
| 484 | unsigned int position, |
| 485 | int status) |
| 486 | { |
| 487 | unsigned int pg_vec_pos, frame_offset; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 488 | union tpacket_uhdr h; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 489 | |
| 490 | pg_vec_pos = position / rb->frames_per_block; |
| 491 | frame_offset = position % rb->frames_per_block; |
| 492 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 493 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
| 494 | (frame_offset * rb->frame_size); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 495 | |
| 496 | if (status != __packet_get_status(po, h.raw)) |
| 497 | return NULL; |
| 498 | |
| 499 | return h.raw; |
| 500 | } |
| 501 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 502 | static void *packet_current_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 503 | struct packet_ring_buffer *rb, |
| 504 | int status) |
| 505 | { |
| 506 | return packet_lookup_frame(po, rb, rb->head, status); |
| 507 | } |
| 508 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 509 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 510 | { |
| 511 | del_timer_sync(&pkc->retire_blk_timer); |
| 512 | } |
| 513 | |
| 514 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, |
| 515 | int tx_ring, |
| 516 | struct sk_buff_head *rb_queue) |
| 517 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 518 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 519 | |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 520 | pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) : |
| 521 | GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 522 | |
Veaceslav Falico | ec6f809 | 2013-11-29 09:53:23 +0100 | [diff] [blame] | 523 | spin_lock_bh(&rb_queue->lock); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 524 | pkc->delete_blk_timer = 1; |
Veaceslav Falico | ec6f809 | 2013-11-29 09:53:23 +0100 | [diff] [blame] | 525 | spin_unlock_bh(&rb_queue->lock); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 526 | |
| 527 | prb_del_retire_blk_timer(pkc); |
| 528 | } |
| 529 | |
| 530 | static void prb_init_blk_timer(struct packet_sock *po, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 531 | struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 532 | void (*func) (unsigned long)) |
| 533 | { |
| 534 | init_timer(&pkc->retire_blk_timer); |
| 535 | pkc->retire_blk_timer.data = (long)po; |
| 536 | pkc->retire_blk_timer.function = func; |
| 537 | pkc->retire_blk_timer.expires = jiffies; |
| 538 | } |
| 539 | |
| 540 | static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring) |
| 541 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 542 | struct tpacket_kbdq_core *pkc; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 543 | |
| 544 | if (tx_ring) |
| 545 | BUG(); |
| 546 | |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 547 | pkc = tx_ring ? GET_PBDQC_FROM_RB(&po->tx_ring) : |
| 548 | GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 549 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
| 550 | } |
| 551 | |
| 552 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, |
| 553 | int blk_size_in_bytes) |
| 554 | { |
| 555 | struct net_device *dev; |
| 556 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 557 | struct ethtool_cmd ecmd; |
| 558 | int err; |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 559 | u32 speed; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 560 | |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 561 | rtnl_lock(); |
| 562 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); |
| 563 | if (unlikely(!dev)) { |
| 564 | rtnl_unlock(); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 565 | return DEFAULT_PRB_RETIRE_TOV; |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 566 | } |
| 567 | err = __ethtool_get_settings(dev, &ecmd); |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 568 | speed = ethtool_cmd_speed(&ecmd); |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 569 | rtnl_unlock(); |
| 570 | if (!err) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 571 | /* |
| 572 | * If the link speed is so slow you don't really |
| 573 | * need to worry about perf anyways |
| 574 | */ |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 575 | if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) { |
Jiri Pirko | 4bc71cb | 2011-09-03 03:34:30 +0000 | [diff] [blame] | 576 | return DEFAULT_PRB_RETIRE_TOV; |
parav.pandit@emulex.com | e440cf2 | 2012-06-27 03:56:12 +0000 | [diff] [blame] | 577 | } else { |
| 578 | msec = 1; |
| 579 | div = speed / 1000; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 580 | } |
| 581 | } |
| 582 | |
| 583 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); |
| 584 | |
| 585 | if (div) |
| 586 | mbits /= div; |
| 587 | |
| 588 | tmo = mbits * msec; |
| 589 | |
| 590 | if (div) |
| 591 | return tmo+1; |
| 592 | return tmo; |
| 593 | } |
| 594 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 595 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 596 | union tpacket_req_u *req_u) |
| 597 | { |
| 598 | p1->feature_req_word = req_u->req3.tp_feature_req_word; |
| 599 | } |
| 600 | |
| 601 | static void init_prb_bdqc(struct packet_sock *po, |
| 602 | struct packet_ring_buffer *rb, |
| 603 | struct pgv *pg_vec, |
| 604 | union tpacket_req_u *req_u, int tx_ring) |
| 605 | { |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 606 | struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 607 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 608 | |
| 609 | memset(p1, 0x0, sizeof(*p1)); |
| 610 | |
| 611 | p1->knxt_seq_num = 1; |
| 612 | p1->pkbdq = pg_vec; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 613 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 614 | p1->pkblk_start = pg_vec[0].buffer; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 615 | p1->kblk_size = req_u->req3.tp_block_size; |
| 616 | p1->knum_blocks = req_u->req3.tp_block_nr; |
| 617 | p1->hdrlen = po->tp_hdrlen; |
| 618 | p1->version = po->tp_version; |
| 619 | p1->last_kactive_blk_num = 0; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 620 | po->stats.stats3.tp_freeze_q_cnt = 0; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 621 | if (req_u->req3.tp_retire_blk_tov) |
| 622 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; |
| 623 | else |
| 624 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, |
| 625 | req_u->req3.tp_block_size); |
| 626 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); |
| 627 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; |
| 628 | |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 629 | p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 630 | prb_init_ft_ops(p1, req_u); |
| 631 | prb_setup_retire_blk_timer(po, tx_ring); |
| 632 | prb_open_block(p1, pbd); |
| 633 | } |
| 634 | |
| 635 | /* Do NOT update the last_blk_num first. |
| 636 | * Assumes sk_buff_head lock is held. |
| 637 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 638 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 639 | { |
| 640 | mod_timer(&pkc->retire_blk_timer, |
| 641 | jiffies + pkc->tov_in_jiffies); |
| 642 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Timer logic: |
| 647 | * 1) We refresh the timer only when we open a block. |
| 648 | * By doing this we don't waste cycles refreshing the timer |
| 649 | * on packet-by-packet basis. |
| 650 | * |
| 651 | * With a 1MB block-size, on a 1Gbps line, it will take |
| 652 | * i) ~8 ms to fill a block + ii) memcpy etc. |
| 653 | * In this cut we are not accounting for the memcpy time. |
| 654 | * |
| 655 | * So, if the user sets the 'tmo' to 10ms then the timer |
| 656 | * will never fire while the block is still getting filled |
| 657 | * (which is what we want). However, the user could choose |
| 658 | * to close a block early and that's fine. |
| 659 | * |
| 660 | * But when the timer does fire, we check whether or not to refresh it. |
| 661 | * Since the tmo granularity is in msecs, it is not too expensive |
| 662 | * to refresh the timer, lets say every '8' msecs. |
| 663 | * Either the user can set the 'tmo' or we can derive it based on |
| 664 | * a) line-speed and b) block-size. |
| 665 | * prb_calc_retire_blk_tmo() calculates the tmo. |
| 666 | * |
| 667 | */ |
| 668 | static void prb_retire_rx_blk_timer_expired(unsigned long data) |
| 669 | { |
| 670 | struct packet_sock *po = (struct packet_sock *)data; |
Duan Jiong | 22781a5 | 2013-12-06 13:29:36 +0800 | [diff] [blame] | 671 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 672 | unsigned int frozen; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 673 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 674 | |
| 675 | spin_lock(&po->sk.sk_receive_queue.lock); |
| 676 | |
| 677 | frozen = prb_queue_frozen(pkc); |
| 678 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 679 | |
| 680 | if (unlikely(pkc->delete_blk_timer)) |
| 681 | goto out; |
| 682 | |
| 683 | /* We only need to plug the race when the block is partially filled. |
| 684 | * tpacket_rcv: |
| 685 | * lock(); increment BLOCK_NUM_PKTS; unlock() |
| 686 | * copy_bits() is in progress ... |
| 687 | * timer fires on other cpu: |
| 688 | * we can't retire the current block because copy_bits |
| 689 | * is in progress. |
| 690 | * |
| 691 | */ |
| 692 | if (BLOCK_NUM_PKTS(pbd)) { |
| 693 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 694 | /* Waiting for skb_copy_bits to finish... */ |
| 695 | cpu_relax(); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { |
| 700 | if (!frozen) { |
| 701 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
| 702 | if (!prb_dispatch_next_block(pkc, po)) |
| 703 | goto refresh_timer; |
| 704 | else |
| 705 | goto out; |
| 706 | } else { |
| 707 | /* Case 1. Queue was frozen because user-space was |
| 708 | * lagging behind. |
| 709 | */ |
| 710 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 711 | /* |
| 712 | * Ok, user-space is still behind. |
| 713 | * So just refresh the timer. |
| 714 | */ |
| 715 | goto refresh_timer; |
| 716 | } else { |
| 717 | /* Case 2. queue was frozen,user-space caught up, |
| 718 | * now the link went idle && the timer fired. |
| 719 | * We don't have a block to close.So we open this |
| 720 | * block and restart the timer. |
| 721 | * opening a block thaws the queue,restarts timer |
| 722 | * Thawing/timer-refresh is a side effect. |
| 723 | */ |
| 724 | prb_open_block(pkc, pbd); |
| 725 | goto out; |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | refresh_timer: |
| 731 | _prb_refresh_rx_retire_blk_timer(pkc); |
| 732 | |
| 733 | out: |
| 734 | spin_unlock(&po->sk.sk_receive_queue.lock); |
| 735 | } |
| 736 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 737 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 738 | struct tpacket_block_desc *pbd1, __u32 status) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 739 | { |
| 740 | /* Flush everything minus the block header */ |
| 741 | |
| 742 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 743 | u8 *start, *end; |
| 744 | |
| 745 | start = (u8 *)pbd1; |
| 746 | |
| 747 | /* Skip the block header(we know header WILL fit in 4K) */ |
| 748 | start += PAGE_SIZE; |
| 749 | |
| 750 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); |
| 751 | for (; start < end; start += PAGE_SIZE) |
| 752 | flush_dcache_page(pgv_to_page(start)); |
| 753 | |
| 754 | smp_wmb(); |
| 755 | #endif |
| 756 | |
| 757 | /* Now update the block status. */ |
| 758 | |
| 759 | BLOCK_STATUS(pbd1) = status; |
| 760 | |
| 761 | /* Flush the block header */ |
| 762 | |
| 763 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 764 | start = (u8 *)pbd1; |
| 765 | flush_dcache_page(pgv_to_page(start)); |
| 766 | |
| 767 | smp_wmb(); |
| 768 | #endif |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Side effect: |
| 773 | * |
| 774 | * 1) flush the block |
| 775 | * 2) Increment active_blk_num |
| 776 | * |
| 777 | * Note:We DONT refresh the timer on purpose. |
| 778 | * Because almost always the next block will be opened. |
| 779 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 780 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
| 781 | struct tpacket_block_desc *pbd1, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 782 | struct packet_sock *po, unsigned int stat) |
| 783 | { |
| 784 | __u32 status = TP_STATUS_USER | stat; |
| 785 | |
| 786 | struct tpacket3_hdr *last_pkt; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 787 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 788 | |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 789 | if (po->stats.stats3.tp_drops) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 790 | status |= TP_STATUS_LOSING; |
| 791 | |
| 792 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; |
| 793 | last_pkt->tp_next_offset = 0; |
| 794 | |
| 795 | /* Get the ts of the last pkt */ |
| 796 | if (BLOCK_NUM_PKTS(pbd1)) { |
| 797 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; |
| 798 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; |
| 799 | } else { |
| 800 | /* Ok, we tmo'd - so get the current time */ |
| 801 | struct timespec ts; |
| 802 | getnstimeofday(&ts); |
| 803 | h1->ts_last_pkt.ts_sec = ts.tv_sec; |
| 804 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; |
| 805 | } |
| 806 | |
| 807 | smp_wmb(); |
| 808 | |
| 809 | /* Flush the block */ |
| 810 | prb_flush_block(pkc1, pbd1, status); |
| 811 | |
| 812 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
| 813 | } |
| 814 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 815 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 816 | { |
| 817 | pkc->reset_pending_on_curr_blk = 0; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Side effect of opening a block: |
| 822 | * |
| 823 | * 1) prb_queue is thawed. |
| 824 | * 2) retire_blk_timer is refreshed. |
| 825 | * |
| 826 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 827 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
| 828 | struct tpacket_block_desc *pbd1) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 829 | { |
| 830 | struct timespec ts; |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 831 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 832 | |
| 833 | smp_rmb(); |
| 834 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 835 | /* We could have just memset this but we will lose the |
| 836 | * flexibility of making the priv area sticky |
| 837 | */ |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 838 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 839 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
| 840 | BLOCK_NUM_PKTS(pbd1) = 0; |
| 841 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 842 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 843 | getnstimeofday(&ts); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 844 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 845 | h1->ts_first_pkt.ts_sec = ts.tv_sec; |
| 846 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 847 | |
Daniel Borkmann | 8da3056 | 2013-05-03 02:57:00 +0000 | [diff] [blame] | 848 | pkc1->pkblk_start = (char *)pbd1; |
| 849 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 850 | |
| 851 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
| 852 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; |
| 853 | |
| 854 | pbd1->version = pkc1->version; |
| 855 | pkc1->prev = pkc1->nxt_offset; |
| 856 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; |
| 857 | |
| 858 | prb_thaw_queue(pkc1); |
| 859 | _prb_refresh_rx_retire_blk_timer(pkc1); |
| 860 | |
| 861 | smp_wmb(); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 862 | } |
| 863 | |
| 864 | /* |
| 865 | * Queue freeze logic: |
| 866 | * 1) Assume tp_block_nr = 8 blocks. |
| 867 | * 2) At time 't0', user opens Rx ring. |
| 868 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 |
| 869 | * 4) user-space is either sleeping or processing block '0'. |
| 870 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, |
| 871 | * it will close block-7,loop around and try to fill block '0'. |
| 872 | * call-flow: |
| 873 | * __packet_lookup_frame_in_block |
| 874 | * prb_retire_current_block() |
| 875 | * prb_dispatch_next_block() |
| 876 | * |->(BLOCK_STATUS == USER) evaluates to true |
| 877 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. |
| 878 | * 6) Now there are two cases: |
| 879 | * 6.1) Link goes idle right after the queue is frozen. |
| 880 | * But remember, the last open_block() refreshed the timer. |
| 881 | * When this timer expires,it will refresh itself so that we can |
| 882 | * re-open block-0 in near future. |
| 883 | * 6.2) Link is busy and keeps on receiving packets. This is a simple |
| 884 | * case and __packet_lookup_frame_in_block will check if block-0 |
| 885 | * is free and can now be re-used. |
| 886 | */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 887 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 888 | struct packet_sock *po) |
| 889 | { |
| 890 | pkc->reset_pending_on_curr_blk = 1; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 891 | po->stats.stats3.tp_freeze_q_cnt++; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) |
| 895 | |
| 896 | /* |
| 897 | * If the next block is free then we will dispatch it |
| 898 | * and return a good offset. |
| 899 | * Else, we will freeze the queue. |
| 900 | * So, caller must check the return value. |
| 901 | */ |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 902 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 903 | struct packet_sock *po) |
| 904 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 905 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 906 | |
| 907 | smp_rmb(); |
| 908 | |
| 909 | /* 1. Get current block num */ |
| 910 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 911 | |
| 912 | /* 2. If this block is currently in_use then freeze the queue */ |
| 913 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { |
| 914 | prb_freeze_queue(pkc, po); |
| 915 | return NULL; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * 3. |
| 920 | * open this block and return the offset where the first packet |
| 921 | * needs to get stored. |
| 922 | */ |
| 923 | prb_open_block(pkc, pbd); |
| 924 | return (void *)pkc->nxt_offset; |
| 925 | } |
| 926 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 927 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 928 | struct packet_sock *po, unsigned int status) |
| 929 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 930 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 931 | |
| 932 | /* retire/close the current block */ |
| 933 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { |
| 934 | /* |
| 935 | * Plug the case where copy_bits() is in progress on |
| 936 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't |
| 937 | * have space to copy the pkt in the current block and |
| 938 | * called prb_retire_current_block() |
| 939 | * |
| 940 | * We don't need to worry about the TMO case because |
| 941 | * the timer-handler already handled this case. |
| 942 | */ |
| 943 | if (!(status & TP_STATUS_BLK_TMO)) { |
| 944 | while (atomic_read(&pkc->blk_fill_in_prog)) { |
| 945 | /* Waiting for skb_copy_bits to finish... */ |
| 946 | cpu_relax(); |
| 947 | } |
| 948 | } |
| 949 | prb_close_block(pkc, pbd, po, status); |
| 950 | return; |
| 951 | } |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 952 | } |
| 953 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 954 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 955 | struct tpacket_block_desc *pbd) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 956 | { |
| 957 | return TP_STATUS_USER & BLOCK_STATUS(pbd); |
| 958 | } |
| 959 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 960 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 961 | { |
| 962 | return pkc->reset_pending_on_curr_blk; |
| 963 | } |
| 964 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 965 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 966 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 967 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 968 | atomic_dec(&pkc->blk_fill_in_prog); |
| 969 | } |
| 970 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 971 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 972 | struct tpacket3_hdr *ppd) |
| 973 | { |
Tom Herbert | 3958afa1b | 2013-12-15 22:12:06 -0800 | [diff] [blame] | 974 | ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 975 | } |
| 976 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 977 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 978 | struct tpacket3_hdr *ppd) |
| 979 | { |
| 980 | ppd->hv1.tp_rxhash = 0; |
| 981 | } |
| 982 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 983 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 984 | struct tpacket3_hdr *ppd) |
| 985 | { |
| 986 | if (vlan_tx_tag_present(pkc->skb)) { |
| 987 | ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 988 | ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto); |
| 989 | ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 990 | } else { |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 991 | ppd->hv1.tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 992 | ppd->hv1.tp_vlan_tpid = 0; |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 993 | ppd->tp_status = TP_STATUS_AVAILABLE; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 994 | } |
| 995 | } |
| 996 | |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 997 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 998 | struct tpacket3_hdr *ppd) |
| 999 | { |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 1000 | ppd->hv1.tp_padding = 0; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1001 | prb_fill_vlan_info(pkc, ppd); |
| 1002 | |
| 1003 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) |
| 1004 | prb_fill_rxhash(pkc, ppd); |
| 1005 | else |
| 1006 | prb_clear_rxhash(pkc, ppd); |
| 1007 | } |
| 1008 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1009 | static void prb_fill_curr_block(char *curr, |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1010 | struct tpacket_kbdq_core *pkc, |
| 1011 | struct tpacket_block_desc *pbd, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1012 | unsigned int len) |
| 1013 | { |
| 1014 | struct tpacket3_hdr *ppd; |
| 1015 | |
| 1016 | ppd = (struct tpacket3_hdr *)curr; |
| 1017 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1018 | pkc->prev = curr; |
| 1019 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1020 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); |
| 1021 | BLOCK_NUM_PKTS(pbd) += 1; |
| 1022 | atomic_inc(&pkc->blk_fill_in_prog); |
| 1023 | prb_run_all_ft_ops(pkc, ppd); |
| 1024 | } |
| 1025 | |
| 1026 | /* Assumes caller has the sk->rx_queue.lock */ |
| 1027 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, |
| 1028 | struct sk_buff *skb, |
| 1029 | int status, |
| 1030 | unsigned int len |
| 1031 | ) |
| 1032 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1033 | struct tpacket_kbdq_core *pkc; |
| 1034 | struct tpacket_block_desc *pbd; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1035 | char *curr, *end; |
| 1036 | |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 1037 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1038 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 1039 | |
| 1040 | /* Queue is frozen when user space is lagging behind */ |
| 1041 | if (prb_queue_frozen(pkc)) { |
| 1042 | /* |
| 1043 | * Check if that last block which caused the queue to freeze, |
| 1044 | * is still in_use by user-space. |
| 1045 | */ |
| 1046 | if (prb_curr_blk_in_use(pkc, pbd)) { |
| 1047 | /* Can't record this packet */ |
| 1048 | return NULL; |
| 1049 | } else { |
| 1050 | /* |
| 1051 | * Ok, the block was released by user-space. |
| 1052 | * Now let's open that block. |
| 1053 | * opening a block also thaws the queue. |
| 1054 | * Thawing is a side effect. |
| 1055 | */ |
| 1056 | prb_open_block(pkc, pbd); |
| 1057 | } |
| 1058 | } |
| 1059 | |
| 1060 | smp_mb(); |
| 1061 | curr = pkc->nxt_offset; |
| 1062 | pkc->skb = skb; |
Joe Perches | e319269 | 2012-06-03 17:41:40 +0000 | [diff] [blame] | 1063 | end = (char *)pbd + pkc->kblk_size; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1064 | |
| 1065 | /* first try the current block */ |
| 1066 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { |
| 1067 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 1068 | return (void *)curr; |
| 1069 | } |
| 1070 | |
| 1071 | /* Ok, close the current block */ |
| 1072 | prb_retire_current_block(pkc, po, 0); |
| 1073 | |
| 1074 | /* Now, try to dispatch the next block */ |
| 1075 | curr = (char *)prb_dispatch_next_block(pkc, po); |
| 1076 | if (curr) { |
| 1077 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
| 1078 | prb_fill_curr_block(curr, pkc, pbd, len); |
| 1079 | return (void *)curr; |
| 1080 | } |
| 1081 | |
| 1082 | /* |
| 1083 | * No free blocks are available.user_space hasn't caught up yet. |
| 1084 | * Queue was just frozen and now this packet will get dropped. |
| 1085 | */ |
| 1086 | return NULL; |
| 1087 | } |
| 1088 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1089 | static void *packet_current_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1090 | struct sk_buff *skb, |
| 1091 | int status, unsigned int len) |
| 1092 | { |
| 1093 | char *curr = NULL; |
| 1094 | switch (po->tp_version) { |
| 1095 | case TPACKET_V1: |
| 1096 | case TPACKET_V2: |
| 1097 | curr = packet_lookup_frame(po, &po->rx_ring, |
| 1098 | po->rx_ring.head, status); |
| 1099 | return curr; |
| 1100 | case TPACKET_V3: |
| 1101 | return __packet_lookup_frame_in_block(po, skb, status, len); |
| 1102 | default: |
| 1103 | WARN(1, "TPACKET version not supported\n"); |
| 1104 | BUG(); |
Ying Xue | 99aa347 | 2012-08-06 16:27:10 +0000 | [diff] [blame] | 1105 | return NULL; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1106 | } |
| 1107 | } |
| 1108 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1109 | static void *prb_lookup_block(struct packet_sock *po, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1110 | struct packet_ring_buffer *rb, |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1111 | unsigned int idx, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1112 | int status) |
| 1113 | { |
chetan loke | bc59ba3 | 2011-08-25 10:43:30 +0000 | [diff] [blame] | 1114 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1115 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1116 | |
| 1117 | if (status != BLOCK_STATUS(pbd)) |
| 1118 | return NULL; |
| 1119 | return pbd; |
| 1120 | } |
| 1121 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1122 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1123 | { |
| 1124 | unsigned int prev; |
| 1125 | if (rb->prb_bdqc.kactive_blk_num) |
| 1126 | prev = rb->prb_bdqc.kactive_blk_num-1; |
| 1127 | else |
| 1128 | prev = rb->prb_bdqc.knum_blocks-1; |
| 1129 | return prev; |
| 1130 | } |
| 1131 | |
| 1132 | /* Assumes caller has held the rx_queue.lock */ |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1133 | static void *__prb_previous_block(struct packet_sock *po, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1134 | struct packet_ring_buffer *rb, |
| 1135 | int status) |
| 1136 | { |
| 1137 | unsigned int previous = prb_previous_blk_num(rb); |
| 1138 | return prb_lookup_block(po, rb, previous, status); |
| 1139 | } |
| 1140 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1141 | static void *packet_previous_rx_frame(struct packet_sock *po, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1142 | struct packet_ring_buffer *rb, |
| 1143 | int status) |
| 1144 | { |
| 1145 | if (po->tp_version <= TPACKET_V2) |
| 1146 | return packet_previous_frame(po, rb, status); |
| 1147 | |
| 1148 | return __prb_previous_block(po, rb, status); |
| 1149 | } |
| 1150 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1151 | static void packet_increment_rx_head(struct packet_sock *po, |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1152 | struct packet_ring_buffer *rb) |
| 1153 | { |
| 1154 | switch (po->tp_version) { |
| 1155 | case TPACKET_V1: |
| 1156 | case TPACKET_V2: |
| 1157 | return packet_increment_head(rb); |
| 1158 | case TPACKET_V3: |
| 1159 | default: |
| 1160 | WARN(1, "TPACKET version not supported.\n"); |
| 1161 | BUG(); |
| 1162 | return; |
| 1163 | } |
| 1164 | } |
| 1165 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1166 | static void *packet_previous_frame(struct packet_sock *po, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1167 | struct packet_ring_buffer *rb, |
| 1168 | int status) |
| 1169 | { |
| 1170 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
| 1171 | return packet_lookup_frame(po, rb, previous, status); |
| 1172 | } |
| 1173 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1174 | static void packet_increment_head(struct packet_ring_buffer *buff) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 1175 | { |
| 1176 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
| 1177 | } |
| 1178 | |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 1179 | static void packet_inc_pending(struct packet_ring_buffer *rb) |
| 1180 | { |
| 1181 | this_cpu_inc(*rb->pending_refcnt); |
| 1182 | } |
| 1183 | |
| 1184 | static void packet_dec_pending(struct packet_ring_buffer *rb) |
| 1185 | { |
| 1186 | this_cpu_dec(*rb->pending_refcnt); |
| 1187 | } |
| 1188 | |
| 1189 | static unsigned int packet_read_pending(const struct packet_ring_buffer *rb) |
| 1190 | { |
| 1191 | unsigned int refcnt = 0; |
| 1192 | int cpu; |
| 1193 | |
| 1194 | /* We don't use pending refcount in rx_ring. */ |
| 1195 | if (rb->pending_refcnt == NULL) |
| 1196 | return 0; |
| 1197 | |
| 1198 | for_each_possible_cpu(cpu) |
| 1199 | refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu); |
| 1200 | |
| 1201 | return refcnt; |
| 1202 | } |
| 1203 | |
| 1204 | static int packet_alloc_pending(struct packet_sock *po) |
| 1205 | { |
| 1206 | po->rx_ring.pending_refcnt = NULL; |
| 1207 | |
| 1208 | po->tx_ring.pending_refcnt = alloc_percpu(unsigned int); |
| 1209 | if (unlikely(po->tx_ring.pending_refcnt == NULL)) |
| 1210 | return -ENOBUFS; |
| 1211 | |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
| 1215 | static void packet_free_pending(struct packet_sock *po) |
| 1216 | { |
| 1217 | free_percpu(po->tx_ring.pending_refcnt); |
| 1218 | } |
| 1219 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1220 | static bool packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
| 1221 | { |
| 1222 | struct sock *sk = &po->sk; |
| 1223 | bool has_room; |
| 1224 | |
| 1225 | if (po->prot_hook.func != tpacket_rcv) |
| 1226 | return (atomic_read(&sk->sk_rmem_alloc) + skb->truesize) |
| 1227 | <= sk->sk_rcvbuf; |
| 1228 | |
| 1229 | spin_lock(&sk->sk_receive_queue.lock); |
| 1230 | if (po->tp_version == TPACKET_V3) |
| 1231 | has_room = prb_lookup_block(po, &po->rx_ring, |
| 1232 | po->rx_ring.prb_bdqc.kactive_blk_num, |
| 1233 | TP_STATUS_KERNEL); |
| 1234 | else |
| 1235 | has_room = packet_lookup_frame(po, &po->rx_ring, |
| 1236 | po->rx_ring.head, |
| 1237 | TP_STATUS_KERNEL); |
| 1238 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1239 | |
| 1240 | return has_room; |
| 1241 | } |
| 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | static void packet_sock_destruct(struct sock *sk) |
| 1244 | { |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 1245 | skb_queue_purge(&sk->sk_error_queue); |
| 1246 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1247 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 1248 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
| 1250 | if (!sock_flag(sk, SOCK_DEAD)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1251 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | return; |
| 1253 | } |
| 1254 | |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 1255 | sk_refcnt_debug_dec(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | } |
| 1257 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1258 | static int fanout_rr_next(struct packet_fanout *f, unsigned int num) |
| 1259 | { |
| 1260 | int x = atomic_read(&f->rr_cur) + 1; |
| 1261 | |
| 1262 | if (x >= num) |
| 1263 | x = 0; |
| 1264 | |
| 1265 | return x; |
| 1266 | } |
| 1267 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1268 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
| 1269 | struct sk_buff *skb, |
| 1270 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1271 | { |
Tom Herbert | 61b905d | 2014-03-24 15:34:47 -0700 | [diff] [blame] | 1272 | return reciprocal_scale(skb_get_hash(skb), num); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1273 | } |
| 1274 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1275 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
| 1276 | struct sk_buff *skb, |
| 1277 | unsigned int num) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1278 | { |
| 1279 | int cur, old; |
| 1280 | |
| 1281 | cur = atomic_read(&f->rr_cur); |
| 1282 | while ((old = atomic_cmpxchg(&f->rr_cur, cur, |
| 1283 | fanout_rr_next(f, num))) != cur) |
| 1284 | cur = old; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1285 | return cur; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1286 | } |
| 1287 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1288 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, |
| 1289 | struct sk_buff *skb, |
| 1290 | unsigned int num) |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1291 | { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1292 | return smp_processor_id() % num; |
| 1293 | } |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1294 | |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1295 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
| 1296 | struct sk_buff *skb, |
| 1297 | unsigned int num) |
| 1298 | { |
Daniel Borkmann | f337db6 | 2014-01-22 02:29:39 +0100 | [diff] [blame] | 1299 | return prandom_u32_max(num); |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1300 | } |
| 1301 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1302 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
| 1303 | struct sk_buff *skb, |
| 1304 | unsigned int idx, unsigned int skip, |
| 1305 | unsigned int num) |
| 1306 | { |
| 1307 | unsigned int i, j; |
| 1308 | |
| 1309 | i = j = min_t(int, f->next[idx], num - 1); |
| 1310 | do { |
| 1311 | if (i != skip && packet_rcv_has_room(pkt_sk(f->arr[i]), skb)) { |
| 1312 | if (i != j) |
| 1313 | f->next[idx] = i; |
| 1314 | return i; |
| 1315 | } |
| 1316 | if (++i == num) |
| 1317 | i = 0; |
| 1318 | } while (i != j); |
| 1319 | |
| 1320 | return idx; |
| 1321 | } |
| 1322 | |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1323 | static unsigned int fanout_demux_qm(struct packet_fanout *f, |
| 1324 | struct sk_buff *skb, |
| 1325 | unsigned int num) |
| 1326 | { |
| 1327 | return skb_get_queue_mapping(skb) % num; |
| 1328 | } |
| 1329 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1330 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
| 1331 | { |
| 1332 | return f->flags & (flag >> 8); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1333 | } |
| 1334 | |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1335 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
| 1336 | struct packet_type *pt, struct net_device *orig_dev) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1337 | { |
| 1338 | struct packet_fanout *f = pt->af_packet_priv; |
| 1339 | unsigned int num = f->num_members; |
| 1340 | struct packet_sock *po; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1341 | unsigned int idx; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1342 | |
| 1343 | if (!net_eq(dev_net(dev), read_pnet(&f->net)) || |
| 1344 | !num) { |
| 1345 | kfree_skb(skb); |
| 1346 | return 0; |
| 1347 | } |
| 1348 | |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1349 | switch (f->type) { |
| 1350 | case PACKET_FANOUT_HASH: |
| 1351 | default: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1352 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
Eric Dumazet | bc416d9 | 2011-10-06 10:28:31 +0000 | [diff] [blame] | 1353 | skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1354 | if (!skb) |
| 1355 | return 0; |
| 1356 | } |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1357 | idx = fanout_demux_hash(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1358 | break; |
| 1359 | case PACKET_FANOUT_LB: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1360 | idx = fanout_demux_lb(f, skb, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1361 | break; |
| 1362 | case PACKET_FANOUT_CPU: |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1363 | idx = fanout_demux_cpu(f, skb, num); |
| 1364 | break; |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1365 | case PACKET_FANOUT_RND: |
| 1366 | idx = fanout_demux_rnd(f, skb, num); |
| 1367 | break; |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1368 | case PACKET_FANOUT_QM: |
| 1369 | idx = fanout_demux_qm(f, skb, num); |
| 1370 | break; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1371 | case PACKET_FANOUT_ROLLOVER: |
| 1372 | idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num); |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1373 | break; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1374 | } |
| 1375 | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1376 | po = pkt_sk(f->arr[idx]); |
| 1377 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER) && |
| 1378 | unlikely(!packet_rcv_has_room(po, skb))) { |
| 1379 | idx = fanout_demux_rollover(f, skb, idx, idx, num); |
| 1380 | po = pkt_sk(f->arr[idx]); |
| 1381 | } |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1382 | |
| 1383 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
| 1384 | } |
| 1385 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1386 | DEFINE_MUTEX(fanout_mutex); |
| 1387 | EXPORT_SYMBOL_GPL(fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1388 | static LIST_HEAD(fanout_list); |
| 1389 | |
| 1390 | static void __fanout_link(struct sock *sk, struct packet_sock *po) |
| 1391 | { |
| 1392 | struct packet_fanout *f = po->fanout; |
| 1393 | |
| 1394 | spin_lock(&f->lock); |
| 1395 | f->arr[f->num_members] = sk; |
| 1396 | smp_wmb(); |
| 1397 | f->num_members++; |
| 1398 | spin_unlock(&f->lock); |
| 1399 | } |
| 1400 | |
| 1401 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) |
| 1402 | { |
| 1403 | struct packet_fanout *f = po->fanout; |
| 1404 | int i; |
| 1405 | |
| 1406 | spin_lock(&f->lock); |
| 1407 | for (i = 0; i < f->num_members; i++) { |
| 1408 | if (f->arr[i] == sk) |
| 1409 | break; |
| 1410 | } |
| 1411 | BUG_ON(i >= f->num_members); |
| 1412 | f->arr[i] = f->arr[f->num_members - 1]; |
| 1413 | f->num_members--; |
| 1414 | spin_unlock(&f->lock); |
| 1415 | } |
| 1416 | |
Weilong Chen | d4dd8ae | 2013-12-23 11:31:38 +0800 | [diff] [blame] | 1417 | static bool match_fanout_group(struct packet_type *ptype, struct sock *sk) |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1418 | { |
Weilong Chen | d4dd8ae | 2013-12-23 11:31:38 +0800 | [diff] [blame] | 1419 | if (ptype->af_packet_priv == (void *)((struct packet_sock *)sk)->fanout) |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1420 | return true; |
| 1421 | |
| 1422 | return false; |
| 1423 | } |
| 1424 | |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1425 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1426 | { |
| 1427 | struct packet_sock *po = pkt_sk(sk); |
| 1428 | struct packet_fanout *f, *match; |
David S. Miller | 7736d33 | 2011-07-05 01:43:20 -0700 | [diff] [blame] | 1429 | u8 type = type_flags & 0xff; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1430 | u8 flags = type_flags >> 8; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1431 | int err; |
| 1432 | |
| 1433 | switch (type) { |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1434 | case PACKET_FANOUT_ROLLOVER: |
| 1435 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) |
| 1436 | return -EINVAL; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1437 | case PACKET_FANOUT_HASH: |
| 1438 | case PACKET_FANOUT_LB: |
David S. Miller | 95ec3eb | 2011-07-06 01:56:38 -0700 | [diff] [blame] | 1439 | case PACKET_FANOUT_CPU: |
Daniel Borkmann | 5df0ddf | 2013-08-28 22:13:09 +0200 | [diff] [blame] | 1440 | case PACKET_FANOUT_RND: |
Neil Horman | 2d36097 | 2014-01-22 16:01:44 -0500 | [diff] [blame] | 1441 | case PACKET_FANOUT_QM: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1442 | break; |
| 1443 | default: |
| 1444 | return -EINVAL; |
| 1445 | } |
| 1446 | |
| 1447 | if (!po->running) |
| 1448 | return -EINVAL; |
| 1449 | |
| 1450 | if (po->fanout) |
| 1451 | return -EALREADY; |
| 1452 | |
| 1453 | mutex_lock(&fanout_mutex); |
| 1454 | match = NULL; |
| 1455 | list_for_each_entry(f, &fanout_list, list) { |
| 1456 | if (f->id == id && |
| 1457 | read_pnet(&f->net) == sock_net(sk)) { |
| 1458 | match = f; |
| 1459 | break; |
| 1460 | } |
| 1461 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1462 | err = -EINVAL; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1463 | if (match && match->flags != flags) |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1464 | goto out; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1465 | if (!match) { |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1466 | err = -ENOMEM; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1467 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1468 | if (!match) |
| 1469 | goto out; |
| 1470 | write_pnet(&match->net, sock_net(sk)); |
| 1471 | match->id = id; |
| 1472 | match->type = type; |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 1473 | match->flags = flags; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1474 | atomic_set(&match->rr_cur, 0); |
| 1475 | INIT_LIST_HEAD(&match->list); |
| 1476 | spin_lock_init(&match->lock); |
| 1477 | atomic_set(&match->sk_ref, 0); |
| 1478 | match->prot_hook.type = po->prot_hook.type; |
| 1479 | match->prot_hook.dev = po->prot_hook.dev; |
| 1480 | match->prot_hook.func = packet_rcv_fanout; |
| 1481 | match->prot_hook.af_packet_priv = match; |
Eric Leblond | c0de08d | 2012-08-16 22:02:58 +0000 | [diff] [blame] | 1482 | match->prot_hook.id_match = match_fanout_group; |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1483 | dev_add_pack(&match->prot_hook); |
| 1484 | list_add(&match->list, &fanout_list); |
| 1485 | } |
| 1486 | err = -EINVAL; |
| 1487 | if (match->type == type && |
| 1488 | match->prot_hook.type == po->prot_hook.type && |
| 1489 | match->prot_hook.dev == po->prot_hook.dev) { |
| 1490 | err = -ENOSPC; |
| 1491 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { |
| 1492 | __dev_remove_pack(&po->prot_hook); |
| 1493 | po->fanout = match; |
| 1494 | atomic_inc(&match->sk_ref); |
| 1495 | __fanout_link(sk, po); |
| 1496 | err = 0; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1497 | } |
| 1498 | } |
Eric Dumazet | afe62c6 | 2011-07-07 06:41:29 -0700 | [diff] [blame] | 1499 | out: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1500 | mutex_unlock(&fanout_mutex); |
| 1501 | return err; |
| 1502 | } |
| 1503 | |
| 1504 | static void fanout_release(struct sock *sk) |
| 1505 | { |
| 1506 | struct packet_sock *po = pkt_sk(sk); |
| 1507 | struct packet_fanout *f; |
| 1508 | |
| 1509 | f = po->fanout; |
| 1510 | if (!f) |
| 1511 | return; |
| 1512 | |
Pavel Emelyanov | fff3321 | 2012-08-16 05:36:48 +0000 | [diff] [blame] | 1513 | mutex_lock(&fanout_mutex); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1514 | po->fanout = NULL; |
| 1515 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 1516 | if (atomic_dec_and_test(&f->sk_ref)) { |
| 1517 | list_del(&f->list); |
| 1518 | dev_remove_pack(&f->prot_hook); |
| 1519 | kfree(f); |
| 1520 | } |
| 1521 | mutex_unlock(&fanout_mutex); |
| 1522 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1524 | static const struct proto_ops packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1526 | static const struct proto_ops packet_ops_spkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1528 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
| 1529 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | { |
| 1531 | struct sock *sk; |
| 1532 | struct sockaddr_pkt *spkt; |
| 1533 | |
| 1534 | /* |
| 1535 | * When we registered the protocol we saved the socket in the data |
| 1536 | * field for just this event. |
| 1537 | */ |
| 1538 | |
| 1539 | sk = pt->af_packet_priv; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | /* |
| 1542 | * Yank back the headers [hope the device set this |
| 1543 | * right or kerboom...] |
| 1544 | * |
| 1545 | * Incoming packets have ll header pulled, |
| 1546 | * push it back. |
| 1547 | * |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1548 | * For outgoing ones skb->data == skb_mac_header(skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | * so that this procedure is noop. |
| 1550 | */ |
| 1551 | |
| 1552 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1553 | goto out; |
| 1554 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1555 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1556 | goto out; |
| 1557 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1558 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 1559 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | goto oom; |
| 1561 | |
| 1562 | /* drop any routing info */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1563 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 1565 | /* drop conntrack reference */ |
| 1566 | nf_reset(skb); |
| 1567 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1568 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1570 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | |
| 1572 | /* |
| 1573 | * The SOCK_PACKET socket receives _all_ frames. |
| 1574 | */ |
| 1575 | |
| 1576 | spkt->spkt_family = dev->type; |
| 1577 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| 1578 | spkt->spkt_protocol = skb->protocol; |
| 1579 | |
| 1580 | /* |
| 1581 | * Charge the memory to the socket. This is done specifically |
| 1582 | * to prevent sockets using all the memory up. |
| 1583 | */ |
| 1584 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1585 | if (sock_queue_rcv_skb(sk, skb) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | return 0; |
| 1587 | |
| 1588 | out: |
| 1589 | kfree_skb(skb); |
| 1590 | oom: |
| 1591 | return 0; |
| 1592 | } |
| 1593 | |
| 1594 | |
| 1595 | /* |
| 1596 | * Output a raw packet to a device layer. This bypasses all the other |
| 1597 | * protocol layers and you must therefore supply it with a complete frame |
| 1598 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
| 1601 | struct msghdr *msg, size_t len) |
| 1602 | { |
| 1603 | struct sock *sk = sock->sk; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1604 | DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1605 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | struct net_device *dev; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1607 | __be16 proto = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | int err; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1609 | int extra_len = 0; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1612 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | */ |
| 1614 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1615 | if (saddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1617 | return -EINVAL; |
| 1618 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) |
| 1619 | proto = saddr->spkt_protocol; |
| 1620 | } else |
| 1621 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | |
| 1623 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1624 | * Find the device first to size check it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | */ |
| 1626 | |
danborkmann@iogearbox.net | de74e92 | 2012-06-10 08:59:28 +0000 | [diff] [blame] | 1627 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1628 | retry: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1629 | rcu_read_lock(); |
| 1630 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | err = -ENODEV; |
| 1632 | if (dev == NULL) |
| 1633 | goto out_unlock; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1634 | |
David S. Miller | d5e76b0 | 2007-01-25 19:30:36 -0800 | [diff] [blame] | 1635 | err = -ENETDOWN; |
| 1636 | if (!(dev->flags & IFF_UP)) |
| 1637 | goto out_unlock; |
| 1638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | /* |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1640 | * You may not queue a frame bigger than the mtu. This is the lowest level |
| 1641 | * raw protocol and you must do your own fragmentation at this level. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1643 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1644 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 1645 | if (!netif_supports_nofcs(dev)) { |
| 1646 | err = -EPROTONOSUPPORT; |
| 1647 | goto out_unlock; |
| 1648 | } |
| 1649 | extra_len = 4; /* We're doing our own CRC */ |
| 1650 | } |
| 1651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | err = -EMSGSIZE; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1653 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | goto out_unlock; |
| 1655 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1656 | if (!skb) { |
| 1657 | size_t reserved = LL_RESERVED_SPACE(dev); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1658 | int tlen = dev->needed_tailroom; |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1659 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1661 | rcu_read_unlock(); |
Herbert Xu | 4ce4091 | 2011-11-18 02:20:05 +0000 | [diff] [blame] | 1662 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1663 | if (skb == NULL) |
| 1664 | return -ENOBUFS; |
| 1665 | /* FIXME: Save some space for broken drivers that write a hard |
| 1666 | * header at transmission time by themselves. PPP is the notable |
| 1667 | * one here. This should really be fixed at the driver level. |
| 1668 | */ |
| 1669 | skb_reserve(skb, reserved); |
| 1670 | skb_reset_network_header(skb); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 1671 | |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1672 | /* Try to align data part correctly */ |
| 1673 | if (hhlen) { |
| 1674 | skb->data -= hhlen; |
| 1675 | skb->tail -= hhlen; |
| 1676 | if (len < hhlen) |
| 1677 | skb_reset_network_header(skb); |
| 1678 | } |
| 1679 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
| 1680 | if (err) |
| 1681 | goto out_free; |
| 1682 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | } |
| 1684 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1685 | if (len > (dev->mtu + dev->hard_header_len + extra_len)) { |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 1686 | /* Earlier code assumed this would be a VLAN pkt, |
| 1687 | * double-check this now that we have the actual |
| 1688 | * packet in hand. |
| 1689 | */ |
| 1690 | struct ethhdr *ehdr; |
| 1691 | skb_reset_mac_header(skb); |
| 1692 | ehdr = eth_hdr(skb); |
| 1693 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| 1694 | err = -EMSGSIZE; |
| 1695 | goto out_unlock; |
| 1696 | } |
| 1697 | } |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | skb->protocol = proto; |
| 1700 | skb->dev = dev; |
| 1701 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 1702 | skb->mark = sk->sk_mark; |
Daniel Borkmann | bf84a010 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 1703 | |
| 1704 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 1706 | if (unlikely(extra_len == 4)) |
| 1707 | skb->no_fcs = 1; |
| 1708 | |
Jason Wang | 40893fd | 2013-03-26 23:11:22 +0000 | [diff] [blame] | 1709 | skb_probe_transport_header(skb, 0); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 1710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | dev_queue_xmit(skb); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1712 | rcu_read_unlock(); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1713 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | out_unlock: |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 1716 | rcu_read_unlock(); |
Eric Dumazet | 1a35ca8 | 2009-12-15 05:47:03 +0000 | [diff] [blame] | 1717 | out_free: |
| 1718 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | return err; |
| 1720 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 1722 | static unsigned int run_filter(const struct sk_buff *skb, |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1723 | const struct sock *sk, |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1724 | unsigned int res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | { |
| 1726 | struct sk_filter *filter; |
| 1727 | |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1728 | rcu_read_lock(); |
| 1729 | filter = rcu_dereference(sk->sk_filter); |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1730 | if (filter != NULL) |
Eric Dumazet | 0a14842 | 2011-04-20 09:27:32 +0000 | [diff] [blame] | 1731 | res = SK_RUN_FILTER(filter, skb); |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1732 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1734 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | } |
| 1736 | |
| 1737 | /* |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1738 | * This function makes lazy skb cloning in hope that most of packets |
| 1739 | * are discarded by BPF. |
| 1740 | * |
| 1741 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| 1742 | * and skb->cb are mangled. It works because (and until) packets |
| 1743 | * falling here are owned by current CPU. Output packets are cloned |
| 1744 | * by dev_queue_xmit_nit(), input packets are processed by net_bh |
| 1745 | * sequencially, so that if we return skb to original state on exit, |
| 1746 | * we will not harm anyone. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | */ |
| 1748 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1749 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
| 1750 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | { |
| 1752 | struct sock *sk; |
| 1753 | struct sockaddr_ll *sll; |
| 1754 | struct packet_sock *po; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1755 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1757 | unsigned int snaplen, res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | |
| 1759 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1760 | goto drop; |
| 1761 | |
| 1762 | sk = pt->af_packet_priv; |
| 1763 | po = pkt_sk(sk); |
| 1764 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1765 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1766 | goto drop; |
| 1767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | skb->dev = dev; |
| 1769 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1770 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | /* The device has an explicit notion of ll header, |
Eric Dumazet | 62ab081 | 2010-12-06 20:50:09 +0000 | [diff] [blame] | 1772 | * exported to higher levels. |
| 1773 | * |
| 1774 | * Otherwise, the device hides details of its frame |
| 1775 | * structure, so that corresponding packet head is |
| 1776 | * never delivered to user. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | */ |
| 1778 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1779 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 1781 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1782 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | } |
| 1784 | } |
| 1785 | |
| 1786 | snaplen = skb->len; |
| 1787 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1788 | res = run_filter(skb, sk, snaplen); |
| 1789 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1790 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1791 | if (snaplen > res) |
| 1792 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 1794 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | goto drop_n_acct; |
| 1796 | |
| 1797 | if (skb_shared(skb)) { |
| 1798 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| 1799 | if (nskb == NULL) |
| 1800 | goto drop_n_acct; |
| 1801 | |
| 1802 | if (skb_head != skb->data) { |
| 1803 | skb->data = skb_head; |
| 1804 | skb->len = skb_len; |
| 1805 | } |
Eric Dumazet | abc4e4f | 2012-04-19 02:24:42 +0000 | [diff] [blame] | 1806 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | skb = nskb; |
| 1808 | } |
| 1809 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1810 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| 1811 | sizeof(skb->cb)); |
| 1812 | |
| 1813 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | sll->sll_family = AF_PACKET; |
| 1815 | sll->sll_hatype = dev->type; |
| 1816 | sll->sll_protocol = skb->protocol; |
| 1817 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 1818 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 1819 | sll->sll_ifindex = orig_dev->ifindex; |
| 1820 | else |
| 1821 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 1823 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 1825 | PACKET_SKB_CB(skb)->origlen = skb->len; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | if (pskb_trim(skb, snaplen)) |
| 1828 | goto drop_n_acct; |
| 1829 | |
| 1830 | skb_set_owner_r(skb, sk); |
| 1831 | skb->dev = NULL; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1832 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | |
Phil Oester | 84531c2 | 2005-07-12 11:57:52 -0700 | [diff] [blame] | 1834 | /* drop conntrack reference */ |
| 1835 | nf_reset(skb); |
| 1836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1838 | po->stats.stats1.tp_packets++; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1839 | skb->dropcount = atomic_read(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 1841 | spin_unlock(&sk->sk_receive_queue.lock); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1842 | sk->sk_data_ready(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | return 0; |
| 1844 | |
| 1845 | drop_n_acct: |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 1846 | spin_lock(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1847 | po->stats.stats1.tp_drops++; |
Willem de Bruijn | 7091fbd | 2011-09-30 10:38:28 +0000 | [diff] [blame] | 1848 | atomic_inc(&sk->sk_drops); |
| 1849 | spin_unlock(&sk->sk_receive_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | |
| 1851 | drop_n_restore: |
| 1852 | if (skb_head != skb->data && skb_shared(skb)) { |
| 1853 | skb->data = skb_head; |
| 1854 | skb->len = skb_len; |
| 1855 | } |
| 1856 | drop: |
Neil Horman | ead2ceb | 2009-03-11 09:49:55 +0000 | [diff] [blame] | 1857 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | return 0; |
| 1859 | } |
| 1860 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1861 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| 1862 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | { |
| 1864 | struct sock *sk; |
| 1865 | struct packet_sock *po; |
| 1866 | struct sockaddr_ll *sll; |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 1867 | union tpacket_uhdr h; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 1868 | u8 *skb_head = skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | int skb_len = skb->len; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1870 | unsigned int snaplen, res; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1871 | unsigned long status = TP_STATUS_USER; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1872 | unsigned short macoff, netoff, hdrlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | struct sk_buff *copy_skb = NULL; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1874 | struct timespec ts; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1875 | __u32 ts_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | |
Atzm Watanabe | 5184635 | 2013-12-17 22:53:32 +0900 | [diff] [blame] | 1877 | /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT. |
| 1878 | * We may add members to them until current aligned size without forcing |
| 1879 | * userspace to call getsockopt(..., PACKET_HDRLEN, ...). |
| 1880 | */ |
| 1881 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32); |
| 1882 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48); |
| 1883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1885 | goto drop; |
| 1886 | |
| 1887 | sk = pt->af_packet_priv; |
| 1888 | po = pkt_sk(sk); |
| 1889 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1890 | if (!net_eq(dev_net(dev), sock_net(sk))) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 1891 | goto drop; |
| 1892 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1893 | if (dev->header_ops) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | if (sk->sk_type != SOCK_DGRAM) |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1895 | skb_push(skb, skb->data - skb_mac_header(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | else if (skb->pkt_type == PACKET_OUTGOING) { |
| 1897 | /* Special case: outgoing packets have ll header at head */ |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1898 | skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | } |
| 1900 | } |
| 1901 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 1902 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1903 | status |= TP_STATUS_CSUMNOTREADY; |
| 1904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | snaplen = skb->len; |
| 1906 | |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1907 | res = run_filter(skb, sk, snaplen); |
| 1908 | if (!res) |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1909 | goto drop_n_restore; |
David S. Miller | dbcb585 | 2007-01-24 15:21:02 -0800 | [diff] [blame] | 1910 | if (snaplen > res) |
| 1911 | snaplen = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | if (sk->sk_type == SOCK_DGRAM) { |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1914 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| 1915 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } else { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1917 | unsigned int maclen = skb_network_offset(skb); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1918 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 1919 | (maclen < 16 ? 16 : maclen)) + |
| 1920 | po->tp_reserve; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | macoff = netoff - maclen; |
| 1922 | } |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1923 | if (po->tp_version <= TPACKET_V2) { |
| 1924 | if (macoff + snaplen > po->rx_ring.frame_size) { |
| 1925 | if (po->copy_thresh && |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 1926 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1927 | if (skb_shared(skb)) { |
| 1928 | copy_skb = skb_clone(skb, GFP_ATOMIC); |
| 1929 | } else { |
| 1930 | copy_skb = skb_get(skb); |
| 1931 | skb_head = skb->data; |
| 1932 | } |
| 1933 | if (copy_skb) |
| 1934 | skb_set_owner_r(copy_skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | } |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1936 | snaplen = po->rx_ring.frame_size - macoff; |
| 1937 | if ((int)snaplen < 0) |
| 1938 | snaplen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | } |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 1940 | } else if (unlikely(macoff + snaplen > |
| 1941 | GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) { |
| 1942 | u32 nval; |
| 1943 | |
| 1944 | nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff; |
| 1945 | pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n", |
| 1946 | snaplen, nval, macoff); |
| 1947 | snaplen = nval; |
| 1948 | if (unlikely((int)snaplen < 0)) { |
| 1949 | snaplen = 0; |
| 1950 | macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len; |
| 1951 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | spin_lock(&sk->sk_receive_queue.lock); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1954 | h.raw = packet_current_rx_frame(po, skb, |
| 1955 | TP_STATUS_KERNEL, (macoff+snaplen)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1956 | if (!h.raw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | goto ring_is_full; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1958 | if (po->tp_version <= TPACKET_V2) { |
| 1959 | packet_increment_rx_head(po, &po->rx_ring); |
| 1960 | /* |
| 1961 | * LOSING will be reported till you read the stats, |
| 1962 | * because it's COR - Clear On Read. |
| 1963 | * Anyways, moving it for V1/V2 only as V3 doesn't need this |
| 1964 | * at packet level. |
| 1965 | */ |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1966 | if (po->stats.stats1.tp_drops) |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 1967 | status |= TP_STATUS_LOSING; |
| 1968 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 1969 | po->stats.stats1.tp_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | if (copy_skb) { |
| 1971 | status |= TP_STATUS_COPY; |
| 1972 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| 1973 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | spin_unlock(&sk->sk_receive_queue.lock); |
| 1975 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1976 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1977 | |
| 1978 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
Daniel Borkmann | 7a51384 | 2013-04-23 00:39:29 +0000 | [diff] [blame] | 1979 | getnstimeofday(&ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 1981 | status |= ts_status; |
| 1982 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1983 | switch (po->tp_version) { |
| 1984 | case TPACKET_V1: |
| 1985 | h.h1->tp_len = skb->len; |
| 1986 | h.h1->tp_snaplen = snaplen; |
| 1987 | h.h1->tp_mac = macoff; |
| 1988 | h.h1->tp_net = netoff; |
Daniel Borkmann | 4b457bd | 2013-04-16 01:29:11 +0000 | [diff] [blame] | 1989 | h.h1->tp_sec = ts.tv_sec; |
| 1990 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1991 | hdrlen = sizeof(*h.h1); |
| 1992 | break; |
| 1993 | case TPACKET_V2: |
| 1994 | h.h2->tp_len = skb->len; |
| 1995 | h.h2->tp_snaplen = snaplen; |
| 1996 | h.h2->tp_mac = macoff; |
| 1997 | h.h2->tp_net = netoff; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 1998 | h.h2->tp_sec = ts.tv_sec; |
| 1999 | h.h2->tp_nsec = ts.tv_nsec; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2000 | if (vlan_tx_tag_present(skb)) { |
| 2001 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 2002 | h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto); |
| 2003 | status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2004 | } else { |
| 2005 | h.h2->tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 2006 | h.h2->tp_vlan_tpid = 0; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2007 | } |
Atzm Watanabe | e4d26f4 | 2013-12-17 22:53:36 +0900 | [diff] [blame] | 2008 | memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding)); |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2009 | hdrlen = sizeof(*h.h2); |
| 2010 | break; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2011 | case TPACKET_V3: |
| 2012 | /* tp_nxt_offset,vlan are already populated above. |
| 2013 | * So DONT clear those fields here |
| 2014 | */ |
| 2015 | h.h3->tp_status |= status; |
| 2016 | h.h3->tp_len = skb->len; |
| 2017 | h.h3->tp_snaplen = snaplen; |
| 2018 | h.h3->tp_mac = macoff; |
| 2019 | h.h3->tp_net = netoff; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2020 | h.h3->tp_sec = ts.tv_sec; |
| 2021 | h.h3->tp_nsec = ts.tv_nsec; |
Atzm Watanabe | e4d26f4 | 2013-12-17 22:53:36 +0900 | [diff] [blame] | 2022 | memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding)); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2023 | hdrlen = sizeof(*h.h3); |
| 2024 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2025 | default: |
| 2026 | BUG(); |
| 2027 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 2029 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
Stephen Hemminger | b95cce3 | 2007-09-26 22:13:38 -0700 | [diff] [blame] | 2030 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | sll->sll_family = AF_PACKET; |
| 2032 | sll->sll_hatype = dev->type; |
| 2033 | sll->sll_protocol = skb->protocol; |
| 2034 | sll->sll_pkttype = skb->pkt_type; |
Peter P Waskiewicz Jr | 8032b46 | 2007-11-10 22:03:25 -0800 | [diff] [blame] | 2035 | if (unlikely(po->origdev)) |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 2036 | sll->sll_ifindex = orig_dev->ifindex; |
| 2037 | else |
| 2038 | sll->sll_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | |
Ralf Baechle | e16aa20 | 2006-12-07 00:11:33 -0800 | [diff] [blame] | 2040 | smp_mb(); |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2041 | |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 2042 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2043 | if (po->tp_version <= TPACKET_V2) { |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2044 | u8 *start, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2046 | end = (u8 *) PAGE_ALIGN((unsigned long) h.raw + |
| 2047 | macoff + snaplen); |
| 2048 | |
| 2049 | for (start = h.raw; start < end; start += PAGE_SIZE) |
| 2050 | flush_dcache_page(pgv_to_page(start)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | } |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2052 | smp_wmb(); |
Changli Gao | f6dafa9 | 2010-12-07 04:26:16 +0000 | [diff] [blame] | 2053 | #endif |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2054 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2055 | if (po->tp_version <= TPACKET_V2) |
| 2056 | __packet_set_status(po, h.raw, status); |
| 2057 | else |
| 2058 | prb_clear_blk_fill_status(&po->rx_ring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2060 | sk->sk_data_ready(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | |
| 2062 | drop_n_restore: |
| 2063 | if (skb_head != skb->data && skb_shared(skb)) { |
| 2064 | skb->data = skb_head; |
| 2065 | skb->len = skb_len; |
| 2066 | } |
| 2067 | drop: |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2068 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | return 0; |
| 2070 | |
| 2071 | ring_is_full: |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 2072 | po->stats.stats1.tp_drops++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | spin_unlock(&sk->sk_receive_queue.lock); |
| 2074 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2075 | sk->sk_data_ready(sk); |
Wei Yongjun | acb5d75 | 2009-02-25 00:36:42 +0000 | [diff] [blame] | 2076 | kfree_skb(copy_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | goto drop_n_restore; |
| 2078 | } |
| 2079 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2080 | static void tpacket_destruct_skb(struct sk_buff *skb) |
| 2081 | { |
| 2082 | struct packet_sock *po = pkt_sk(skb->sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2083 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2084 | if (likely(po->tx_ring.pg_vec)) { |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 2085 | void *ph; |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2086 | __u32 ts; |
| 2087 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2088 | ph = skb_shinfo(skb)->destructor_arg; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2089 | packet_dec_pending(&po->tx_ring); |
Daniel Borkmann | b9c32fb | 2013-04-23 00:39:31 +0000 | [diff] [blame] | 2090 | |
| 2091 | ts = __packet_set_timestamp(po, ph, skb); |
| 2092 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2093 | } |
| 2094 | |
| 2095 | sock_wfree(skb); |
| 2096 | } |
| 2097 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2098 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
| 2099 | void *frame, struct net_device *dev, int size_max, |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2100 | __be16 proto, unsigned char *addr, int hlen) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2101 | { |
Daniel Borkmann | 184f489 | 2013-04-16 01:57:46 +0000 | [diff] [blame] | 2102 | union tpacket_uhdr ph; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2103 | int to_write, offset, len, tp_len, nr_frags, len_max; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2104 | struct socket *sock = po->sk.sk_socket; |
| 2105 | struct page *page; |
| 2106 | void *data; |
| 2107 | int err; |
| 2108 | |
| 2109 | ph.raw = frame; |
| 2110 | |
| 2111 | skb->protocol = proto; |
| 2112 | skb->dev = dev; |
| 2113 | skb->priority = po->sk.sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 2114 | skb->mark = po->sk.sk_mark; |
Willem de Bruijn | 2e31396 | 2013-04-23 00:39:28 +0000 | [diff] [blame] | 2115 | sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2116 | skb_shinfo(skb)->destructor_arg = ph.raw; |
| 2117 | |
| 2118 | switch (po->tp_version) { |
| 2119 | case TPACKET_V2: |
| 2120 | tp_len = ph.h2->tp_len; |
| 2121 | break; |
| 2122 | default: |
| 2123 | tp_len = ph.h1->tp_len; |
| 2124 | break; |
| 2125 | } |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2126 | if (unlikely(tp_len > size_max)) { |
| 2127 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
| 2128 | return -EMSGSIZE; |
| 2129 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2130 | |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2131 | skb_reserve(skb, hlen); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2132 | skb_reset_network_header(skb); |
Jason Wang | c1aad27 | 2013-03-25 20:19:57 +0000 | [diff] [blame] | 2133 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2134 | if (!packet_use_direct_xmit(po)) |
| 2135 | skb_probe_transport_header(skb, 0); |
| 2136 | if (unlikely(po->tp_tx_has_off)) { |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 2137 | int off_min, off_max, off; |
| 2138 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 2139 | off_max = po->tx_ring.frame_size - tp_len; |
| 2140 | if (sock->type == SOCK_DGRAM) { |
| 2141 | switch (po->tp_version) { |
| 2142 | case TPACKET_V2: |
| 2143 | off = ph.h2->tp_net; |
| 2144 | break; |
| 2145 | default: |
| 2146 | off = ph.h1->tp_net; |
| 2147 | break; |
| 2148 | } |
| 2149 | } else { |
| 2150 | switch (po->tp_version) { |
| 2151 | case TPACKET_V2: |
| 2152 | off = ph.h2->tp_mac; |
| 2153 | break; |
| 2154 | default: |
| 2155 | off = ph.h1->tp_mac; |
| 2156 | break; |
| 2157 | } |
| 2158 | } |
| 2159 | if (unlikely((off < off_min) || (off_max < off))) |
| 2160 | return -EINVAL; |
| 2161 | data = ph.raw + off; |
| 2162 | } else { |
| 2163 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| 2164 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2165 | to_write = tp_len; |
| 2166 | |
| 2167 | if (sock->type == SOCK_DGRAM) { |
| 2168 | err = dev_hard_header(skb, dev, ntohs(proto), addr, |
| 2169 | NULL, tp_len); |
| 2170 | if (unlikely(err < 0)) |
| 2171 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2172 | } else if (dev->hard_header_len) { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2173 | /* net device doesn't like empty head */ |
| 2174 | if (unlikely(tp_len <= dev->hard_header_len)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2175 | pr_err("packet size is too short (%d < %d)\n", |
| 2176 | tp_len, dev->hard_header_len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2177 | return -EINVAL; |
| 2178 | } |
| 2179 | |
| 2180 | skb_push(skb, dev->hard_header_len); |
| 2181 | err = skb_store_bits(skb, 0, data, |
| 2182 | dev->hard_header_len); |
| 2183 | if (unlikely(err)) |
| 2184 | return err; |
| 2185 | |
| 2186 | data += dev->hard_header_len; |
| 2187 | to_write -= dev->hard_header_len; |
| 2188 | } |
| 2189 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2190 | offset = offset_in_page(data); |
| 2191 | len_max = PAGE_SIZE - offset; |
| 2192 | len = ((to_write > len_max) ? len_max : to_write); |
| 2193 | |
| 2194 | skb->data_len = to_write; |
| 2195 | skb->len += to_write; |
| 2196 | skb->truesize += to_write; |
| 2197 | atomic_add(to_write, &po->sk.sk_wmem_alloc); |
| 2198 | |
| 2199 | while (likely(to_write)) { |
| 2200 | nr_frags = skb_shinfo(skb)->nr_frags; |
| 2201 | |
| 2202 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2203 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
| 2204 | MAX_SKB_FRAGS); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2205 | return -EFAULT; |
| 2206 | } |
| 2207 | |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2208 | page = pgv_to_page(data); |
| 2209 | data += len; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2210 | flush_dcache_page(page); |
| 2211 | get_page(page); |
Changli Gao | 0af55bb | 2010-12-01 02:52:20 +0000 | [diff] [blame] | 2212 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2213 | to_write -= len; |
| 2214 | offset = 0; |
| 2215 | len_max = PAGE_SIZE; |
| 2216 | len = ((to_write > len_max) ? len_max : to_write); |
| 2217 | } |
| 2218 | |
| 2219 | return tp_len; |
| 2220 | } |
| 2221 | |
| 2222 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
| 2223 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2224 | struct sk_buff *skb; |
| 2225 | struct net_device *dev; |
| 2226 | __be16 proto; |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2227 | int err, reserve = 0; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2228 | void *ph; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2229 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2230 | bool need_wait = !(msg->msg_flags & MSG_DONTWAIT); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2231 | int tp_len, size_max; |
| 2232 | unsigned char *addr; |
| 2233 | int len_sum = 0; |
danborkmann@iogearbox.net | 9e67030 | 2012-08-20 03:34:03 +0000 | [diff] [blame] | 2234 | int status = TP_STATUS_AVAILABLE; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2235 | int hlen, tlen; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2236 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2237 | mutex_lock(&po->pg_vec_lock); |
| 2238 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2239 | if (likely(saddr == NULL)) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2240 | dev = packet_cached_dev_get(po); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2241 | proto = po->num; |
| 2242 | addr = NULL; |
| 2243 | } else { |
| 2244 | err = -EINVAL; |
| 2245 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2246 | goto out; |
| 2247 | if (msg->msg_namelen < (saddr->sll_halen |
| 2248 | + offsetof(struct sockaddr_ll, |
| 2249 | sll_addr))) |
| 2250 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2251 | proto = saddr->sll_protocol; |
| 2252 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2253 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2254 | } |
| 2255 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2256 | err = -ENXIO; |
| 2257 | if (unlikely(dev == NULL)) |
| 2258 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2259 | err = -ENETDOWN; |
| 2260 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2261 | goto out_put; |
| 2262 | |
Daniel Borkmann | 52f1454 | 2014-02-28 02:22:06 +0100 | [diff] [blame] | 2263 | reserve = dev->hard_header_len + VLAN_HLEN; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2264 | size_max = po->tx_ring.frame_size |
Gabor Gombas | b5dd884 | 2009-10-29 03:19:11 -0700 | [diff] [blame] | 2265 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2266 | |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2267 | if (size_max > dev->mtu + reserve) |
| 2268 | size_max = dev->mtu + reserve; |
| 2269 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2270 | do { |
| 2271 | ph = packet_current_frame(po, &po->tx_ring, |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2272 | TP_STATUS_SEND_REQUEST); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2273 | if (unlikely(ph == NULL)) { |
Daniel Borkmann | 87a2fd2 | 2014-01-15 16:25:35 +0100 | [diff] [blame] | 2274 | if (need_wait && need_resched()) |
| 2275 | schedule(); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2276 | continue; |
| 2277 | } |
| 2278 | |
| 2279 | status = TP_STATUS_SEND_REQUEST; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2280 | hlen = LL_RESERVED_SPACE(dev); |
| 2281 | tlen = dev->needed_tailroom; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2282 | skb = sock_alloc_send_skb(&po->sk, |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2283 | hlen + tlen + sizeof(struct sockaddr_ll), |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2284 | 0, &err); |
| 2285 | |
| 2286 | if (unlikely(skb == NULL)) |
| 2287 | goto out_status; |
| 2288 | |
| 2289 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
Daniel Borkmann | 52f1454 | 2014-02-28 02:22:06 +0100 | [diff] [blame] | 2290 | addr, hlen); |
| 2291 | if (tp_len > dev->mtu + dev->hard_header_len) { |
| 2292 | struct ethhdr *ehdr; |
| 2293 | /* Earlier code assumed this would be a VLAN pkt, |
| 2294 | * double-check this now that we have the actual |
| 2295 | * packet in hand. |
| 2296 | */ |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2297 | |
Daniel Borkmann | 52f1454 | 2014-02-28 02:22:06 +0100 | [diff] [blame] | 2298 | skb_reset_mac_header(skb); |
| 2299 | ehdr = eth_hdr(skb); |
| 2300 | if (ehdr->h_proto != htons(ETH_P_8021Q)) |
| 2301 | tp_len = -EMSGSIZE; |
| 2302 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2303 | if (unlikely(tp_len < 0)) { |
| 2304 | if (po->tp_loss) { |
| 2305 | __packet_set_status(po, ph, |
| 2306 | TP_STATUS_AVAILABLE); |
| 2307 | packet_increment_head(&po->tx_ring); |
| 2308 | kfree_skb(skb); |
| 2309 | continue; |
| 2310 | } else { |
| 2311 | status = TP_STATUS_WRONG_FORMAT; |
| 2312 | err = tp_len; |
| 2313 | goto out_status; |
| 2314 | } |
| 2315 | } |
| 2316 | |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 2317 | packet_pick_tx_queue(dev, skb); |
| 2318 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2319 | skb->destructor = tpacket_destruct_skb; |
| 2320 | __packet_set_status(po, ph, TP_STATUS_SENDING); |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2321 | packet_inc_pending(&po->tx_ring); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2322 | |
| 2323 | status = TP_STATUS_SEND_REQUEST; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2324 | err = po->xmit(skb); |
Jarek Poplawski | eb70df1 | 2010-01-10 22:04:19 +0000 | [diff] [blame] | 2325 | if (unlikely(err > 0)) { |
| 2326 | err = net_xmit_errno(err); |
| 2327 | if (err && __packet_get_status(po, ph) == |
| 2328 | TP_STATUS_AVAILABLE) { |
| 2329 | /* skb was destructed already */ |
| 2330 | skb = NULL; |
| 2331 | goto out_status; |
| 2332 | } |
| 2333 | /* |
| 2334 | * skb was dropped but not destructed yet; |
| 2335 | * let's treat it like congestion or err < 0 |
| 2336 | */ |
| 2337 | err = 0; |
| 2338 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2339 | packet_increment_head(&po->tx_ring); |
| 2340 | len_sum += tp_len; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2341 | } while (likely((ph != NULL) || |
| 2342 | /* Note: packet_read_pending() might be slow if we have |
| 2343 | * to call it as it's per_cpu variable, but in fast-path |
| 2344 | * we already short-circuit the loop with the first |
| 2345 | * condition, and luckily don't have to go that path |
| 2346 | * anyway. |
| 2347 | */ |
| 2348 | (need_wait && packet_read_pending(&po->tx_ring)))); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2349 | |
| 2350 | err = len_sum; |
| 2351 | goto out_put; |
| 2352 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2353 | out_status: |
| 2354 | __packet_set_status(po, ph, status); |
| 2355 | kfree_skb(skb); |
| 2356 | out_put: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2357 | dev_put(dev); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2358 | out: |
| 2359 | mutex_unlock(&po->pg_vec_lock); |
| 2360 | return err; |
| 2361 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 2363 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
| 2364 | size_t reserve, size_t len, |
| 2365 | size_t linear, int noblock, |
| 2366 | int *err) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2367 | { |
| 2368 | struct sk_buff *skb; |
| 2369 | |
| 2370 | /* Under a page? Don't bother with paged skb. */ |
| 2371 | if (prepad + len < PAGE_SIZE || !linear) |
| 2372 | linear = len; |
| 2373 | |
| 2374 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 2375 | err, 0); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2376 | if (!skb) |
| 2377 | return NULL; |
| 2378 | |
| 2379 | skb_reserve(skb, reserve); |
| 2380 | skb_put(skb, linear); |
| 2381 | skb->data_len = len - linear; |
| 2382 | skb->len += len - linear; |
| 2383 | |
| 2384 | return skb; |
| 2385 | } |
| 2386 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2387 | static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | { |
| 2389 | struct sock *sk = sock->sk; |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2390 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | struct sk_buff *skb; |
| 2392 | struct net_device *dev; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2393 | __be16 proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | unsigned char *addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2395 | int err, reserve = 0; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2396 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 2397 | int offset = 0; |
| 2398 | int vnet_hdr_len; |
| 2399 | struct packet_sock *po = pkt_sk(sk); |
| 2400 | unsigned short gso_type = 0; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2401 | int hlen, tlen; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2402 | int extra_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | |
| 2404 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2405 | * Get and verify the address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2407 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2408 | if (likely(saddr == NULL)) { |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2409 | dev = packet_cached_dev_get(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | proto = po->num; |
| 2411 | addr = NULL; |
| 2412 | } else { |
| 2413 | err = -EINVAL; |
| 2414 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| 2415 | goto out; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2416 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| 2417 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | proto = saddr->sll_protocol; |
| 2419 | addr = saddr->sll_addr; |
Ben Greear | 827d978 | 2011-06-01 07:18:53 +0000 | [diff] [blame] | 2420 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2421 | } |
| 2422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | err = -ENXIO; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2424 | if (unlikely(dev == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | goto out_unlock; |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2426 | err = -ENETDOWN; |
| 2427 | if (unlikely(!(dev->flags & IFF_UP))) |
| 2428 | goto out_unlock; |
| 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | if (sock->type == SOCK_RAW) |
| 2431 | reserve = dev->hard_header_len; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2432 | if (po->has_vnet_hdr) { |
| 2433 | vnet_hdr_len = sizeof(vnet_hdr); |
| 2434 | |
| 2435 | err = -EINVAL; |
| 2436 | if (len < vnet_hdr_len) |
| 2437 | goto out_unlock; |
| 2438 | |
| 2439 | len -= vnet_hdr_len; |
| 2440 | |
| 2441 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, |
| 2442 | vnet_hdr_len); |
| 2443 | if (err < 0) |
| 2444 | goto out_unlock; |
| 2445 | |
| 2446 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2447 | (__virtio16_to_cpu(false, vnet_hdr.csum_start) + |
| 2448 | __virtio16_to_cpu(false, vnet_hdr.csum_offset) + 2 > |
| 2449 | __virtio16_to_cpu(false, vnet_hdr.hdr_len))) |
| 2450 | vnet_hdr.hdr_len = __cpu_to_virtio16(false, |
| 2451 | __virtio16_to_cpu(false, vnet_hdr.csum_start) + |
| 2452 | __virtio16_to_cpu(false, vnet_hdr.csum_offset) + 2); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2453 | |
| 2454 | err = -EINVAL; |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2455 | if (__virtio16_to_cpu(false, vnet_hdr.hdr_len) > len) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2456 | goto out_unlock; |
| 2457 | |
| 2458 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| 2459 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| 2460 | case VIRTIO_NET_HDR_GSO_TCPV4: |
| 2461 | gso_type = SKB_GSO_TCPV4; |
| 2462 | break; |
| 2463 | case VIRTIO_NET_HDR_GSO_TCPV6: |
| 2464 | gso_type = SKB_GSO_TCPV6; |
| 2465 | break; |
| 2466 | case VIRTIO_NET_HDR_GSO_UDP: |
| 2467 | gso_type = SKB_GSO_UDP; |
| 2468 | break; |
| 2469 | default: |
| 2470 | goto out_unlock; |
| 2471 | } |
| 2472 | |
| 2473 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| 2474 | gso_type |= SKB_GSO_TCP_ECN; |
| 2475 | |
| 2476 | if (vnet_hdr.gso_size == 0) |
| 2477 | goto out_unlock; |
| 2478 | |
| 2479 | } |
| 2480 | } |
| 2481 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2482 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
| 2483 | if (!netif_supports_nofcs(dev)) { |
| 2484 | err = -EPROTONOSUPPORT; |
| 2485 | goto out_unlock; |
| 2486 | } |
| 2487 | extra_len = 4; /* We're doing our own CRC */ |
| 2488 | } |
| 2489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | err = -EMSGSIZE; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2491 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | goto out_unlock; |
| 2493 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2494 | err = -ENOBUFS; |
Herbert Xu | ae64194 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 2495 | hlen = LL_RESERVED_SPACE(dev); |
| 2496 | tlen = dev->needed_tailroom; |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2497 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, |
| 2498 | __virtio16_to_cpu(false, vnet_hdr.hdr_len), |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2499 | msg->msg_flags & MSG_DONTWAIT, &err); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2500 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | goto out_unlock; |
| 2502 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2503 | skb_set_network_header(skb, reserve); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 2505 | err = -EINVAL; |
| 2506 | if (sock->type == SOCK_DGRAM && |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2507 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 2508 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | |
| 2510 | /* Returns -EFAULT on error */ |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2511 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | if (err) |
| 2513 | goto out_free; |
Daniel Borkmann | bf84a010 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 2514 | |
| 2515 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2517 | if (!gso_type && (len > dev->mtu + reserve + extra_len)) { |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2518 | /* Earlier code assumed this would be a VLAN pkt, |
| 2519 | * double-check this now that we have the actual |
| 2520 | * packet in hand. |
| 2521 | */ |
| 2522 | struct ethhdr *ehdr; |
| 2523 | skb_reset_mac_header(skb); |
| 2524 | ehdr = eth_hdr(skb); |
| 2525 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| 2526 | err = -EMSGSIZE; |
| 2527 | goto out_free; |
| 2528 | } |
Ben Greear | 57f89bf | 2011-02-11 09:35:18 +0000 | [diff] [blame] | 2529 | } |
| 2530 | |
David S. Miller | 09effa6 | 2013-08-07 17:11:00 -0700 | [diff] [blame] | 2531 | skb->protocol = proto; |
| 2532 | skb->dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | skb->priority = sk->sk_priority; |
Eric Dumazet | 2d37a18 | 2009-10-01 19:14:46 +0000 | [diff] [blame] | 2534 | skb->mark = sk->sk_mark; |
Daniel Borkmann | 0fd5d57 | 2014-02-16 15:55:22 +0100 | [diff] [blame] | 2535 | |
| 2536 | packet_pick_tx_queue(dev, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2538 | if (po->has_vnet_hdr) { |
| 2539 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2540 | u16 s = __virtio16_to_cpu(false, vnet_hdr.csum_start); |
| 2541 | u16 o = __virtio16_to_cpu(false, vnet_hdr.csum_offset); |
| 2542 | if (!skb_partial_csum_set(skb, s, o)) { |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2543 | err = -EINVAL; |
| 2544 | goto out_free; |
| 2545 | } |
| 2546 | } |
| 2547 | |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2548 | skb_shinfo(skb)->gso_size = |
| 2549 | __virtio16_to_cpu(false, vnet_hdr.gso_size); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2550 | skb_shinfo(skb)->gso_type = gso_type; |
| 2551 | |
| 2552 | /* Header must be checked, and gso_segs computed. */ |
| 2553 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| 2554 | skb_shinfo(skb)->gso_segs = 0; |
| 2555 | |
| 2556 | len += vnet_hdr_len; |
| 2557 | } |
| 2558 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2559 | if (!packet_use_direct_xmit(po)) |
| 2560 | skb_probe_transport_header(skb, reserve); |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 2561 | if (unlikely(extra_len == 4)) |
| 2562 | skb->no_fcs = 1; |
| 2563 | |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2564 | err = po->xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| 2566 | goto out_unlock; |
| 2567 | |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2568 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2570 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2571 | |
| 2572 | out_free: |
| 2573 | kfree_skb(skb); |
| 2574 | out_unlock: |
Daniel Borkmann | e40526c | 2013-11-21 16:50:58 +0100 | [diff] [blame] | 2575 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | dev_put(dev); |
| 2577 | out: |
| 2578 | return err; |
| 2579 | } |
| 2580 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2581 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 2582 | struct msghdr *msg, size_t len) |
| 2583 | { |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2584 | struct sock *sk = sock->sk; |
| 2585 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2586 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2587 | if (po->tx_ring.pg_vec) |
| 2588 | return tpacket_snd(po, msg); |
| 2589 | else |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2590 | return packet_snd(sock, msg, len); |
| 2591 | } |
| 2592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | /* |
| 2594 | * Close a PACKET socket. This is fairly simple. We immediately go |
| 2595 | * to 'closed' state and remove our protocol entry in the device list. |
| 2596 | */ |
| 2597 | |
| 2598 | static int packet_release(struct socket *sock) |
| 2599 | { |
| 2600 | struct sock *sk = sock->sk; |
| 2601 | struct packet_sock *po; |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 2602 | struct net *net; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2603 | union tpacket_req_u req_u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | |
| 2605 | if (!sk) |
| 2606 | return 0; |
| 2607 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2608 | net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | po = pkt_sk(sk); |
| 2610 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2611 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2612 | sk_del_node_init_rcu(sk); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2613 | mutex_unlock(&net->packet.sklist_lock); |
| 2614 | |
| 2615 | preempt_disable(); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 2616 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2617 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2618 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2619 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2620 | unregister_prot_hook(sk, false); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2621 | packet_cached_dev_reset(po); |
| 2622 | |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 2623 | if (po->prot_hook.dev) { |
| 2624 | dev_put(po->prot_hook.dev); |
| 2625 | po->prot_hook.dev = NULL; |
| 2626 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2627 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | packet_flush_mclist(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2631 | if (po->rx_ring.pg_vec) { |
| 2632 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2633 | packet_set_ring(sk, &req_u, 1, 0); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2634 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 2635 | |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2636 | if (po->tx_ring.pg_vec) { |
| 2637 | memset(&req_u, 0, sizeof(req_u)); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 2638 | packet_set_ring(sk, &req_u, 1, 1); |
Phil Sutter | 9665d5d | 2013-02-01 07:21:41 +0000 | [diff] [blame] | 2639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2641 | fanout_release(sk); |
| 2642 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2643 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | /* |
| 2645 | * Now the socket is dead. No more input will appear. |
| 2646 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | sock_orphan(sk); |
| 2648 | sock->sk = NULL; |
| 2649 | |
| 2650 | /* Purge queues */ |
| 2651 | |
| 2652 | skb_queue_purge(&sk->sk_receive_queue); |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2653 | packet_free_pending(po); |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 2654 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | |
| 2656 | sock_put(sk); |
| 2657 | return 0; |
| 2658 | } |
| 2659 | |
| 2660 | /* |
| 2661 | * Attach a packet hook. |
| 2662 | */ |
| 2663 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2664 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | { |
| 2666 | struct packet_sock *po = pkt_sk(sk); |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2667 | const struct net_device *dev_curr; |
| 2668 | __be16 proto_curr; |
| 2669 | bool need_rehook; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2670 | |
Wei Yongjun | aef950b | 2011-12-27 22:32:41 -0500 | [diff] [blame] | 2671 | if (po->fanout) { |
| 2672 | if (dev) |
| 2673 | dev_put(dev); |
| 2674 | |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 2675 | return -EINVAL; |
Wei Yongjun | aef950b | 2011-12-27 22:32:41 -0500 | [diff] [blame] | 2676 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | |
| 2678 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | spin_lock(&po->bind_lock); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2680 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2681 | proto_curr = po->prot_hook.type; |
| 2682 | dev_curr = po->prot_hook.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2684 | need_rehook = proto_curr != proto || dev_curr != dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2685 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2686 | if (need_rehook) { |
| 2687 | unregister_prot_hook(sk, true); |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2688 | |
Daniel Borkmann | 902fefb | 2014-01-15 16:25:34 +0100 | [diff] [blame] | 2689 | po->num = proto; |
| 2690 | po->prot_hook.type = proto; |
| 2691 | |
| 2692 | if (po->prot_hook.dev) |
| 2693 | dev_put(po->prot_hook.dev); |
| 2694 | |
| 2695 | po->prot_hook.dev = dev; |
| 2696 | |
| 2697 | po->ifindex = dev ? dev->ifindex : 0; |
| 2698 | packet_cached_dev_assign(po, dev); |
| 2699 | } |
| 2700 | |
| 2701 | if (proto == 0 || !need_rehook) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | goto out_unlock; |
| 2703 | |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 2704 | if (!dev || (dev->flags & IFF_UP)) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2705 | register_prot_hook(sk); |
Urs Thuermann | be85d4a | 2007-11-12 21:05:20 -0800 | [diff] [blame] | 2706 | } else { |
| 2707 | sk->sk_err = ENETDOWN; |
| 2708 | if (!sock_flag(sk, SOCK_DEAD)) |
| 2709 | sk->sk_error_report(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | } |
| 2711 | |
| 2712 | out_unlock: |
| 2713 | spin_unlock(&po->bind_lock); |
| 2714 | release_sock(sk); |
| 2715 | return 0; |
| 2716 | } |
| 2717 | |
| 2718 | /* |
| 2719 | * Bind a packet socket to a device |
| 2720 | */ |
| 2721 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2722 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 2723 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2725 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | char name[15]; |
| 2727 | struct net_device *dev; |
| 2728 | int err = -ENODEV; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | /* |
| 2731 | * Check legality |
| 2732 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2733 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 2734 | if (addr_len != sizeof(struct sockaddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2736 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2738 | dev = dev_get_by_name(sock_net(sk), name); |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 2739 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2740 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | return err; |
| 2742 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | |
| 2744 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 2745 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2746 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
| 2747 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2748 | struct net_device *dev = NULL; |
| 2749 | int err; |
| 2750 | |
| 2751 | |
| 2752 | /* |
| 2753 | * Check legality |
| 2754 | */ |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | if (addr_len < sizeof(struct sockaddr_ll)) |
| 2757 | return -EINVAL; |
| 2758 | if (sll->sll_family != AF_PACKET) |
| 2759 | return -EINVAL; |
| 2760 | |
| 2761 | if (sll->sll_ifindex) { |
| 2762 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2763 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2764 | if (dev == NULL) |
| 2765 | goto out; |
| 2766 | } |
| 2767 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2768 | |
| 2769 | out: |
| 2770 | return err; |
| 2771 | } |
| 2772 | |
| 2773 | static struct proto packet_proto = { |
| 2774 | .name = "PACKET", |
| 2775 | .owner = THIS_MODULE, |
| 2776 | .obj_size = sizeof(struct packet_sock), |
| 2777 | }; |
| 2778 | |
| 2779 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2780 | * Create a packet of type SOCK_PACKET. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | */ |
| 2782 | |
Eric Paris | 3f378b68 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 2783 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
| 2784 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2785 | { |
| 2786 | struct sock *sk; |
| 2787 | struct packet_sock *po; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2788 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | int err; |
| 2790 | |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 2791 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | return -EPERM; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2793 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| 2794 | sock->type != SOCK_PACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2795 | return -ESOCKTNOSUPPORT; |
| 2796 | |
| 2797 | sock->state = SS_UNCONNECTED; |
| 2798 | |
| 2799 | err = -ENOBUFS; |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 2800 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | if (sk == NULL) |
| 2802 | goto out; |
| 2803 | |
| 2804 | sock->ops = &packet_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | if (sock->type == SOCK_PACKET) |
| 2806 | sock->ops = &packet_ops_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | sock_init_data(sock, sk); |
| 2809 | |
| 2810 | po = pkt_sk(sk); |
| 2811 | sk->sk_family = PF_PACKET; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2812 | po->num = proto; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 2813 | po->xmit = dev_queue_xmit; |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2814 | |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2815 | err = packet_alloc_pending(po); |
| 2816 | if (err) |
| 2817 | goto out2; |
| 2818 | |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 2819 | packet_cached_dev_reset(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | |
| 2821 | sk->sk_destruct = packet_sock_destruct; |
Pavel Emelyanov | 17ab56a | 2007-11-10 21:38:48 -0800 | [diff] [blame] | 2822 | sk_refcnt_debug_inc(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2823 | |
| 2824 | /* |
| 2825 | * Attach a protocol block |
| 2826 | */ |
| 2827 | |
| 2828 | spin_lock_init(&po->bind_lock); |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 2829 | mutex_init(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2830 | po->prot_hook.func = packet_rcv; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2832 | if (sock->type == SOCK_PACKET) |
| 2833 | po->prot_hook.func = packet_rcv_spkt; |
David S. Miller | be02097 | 2007-05-29 13:16:31 -0700 | [diff] [blame] | 2834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2835 | po->prot_hook.af_packet_priv = sk; |
| 2836 | |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 2837 | if (proto) { |
| 2838 | po->prot_hook.type = proto; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 2839 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2840 | } |
| 2841 | |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2842 | mutex_lock(&net->packet.sklist_lock); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2843 | sk_add_node_rcu(sk, &net->packet.sklist); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2844 | mutex_unlock(&net->packet.sklist_lock); |
| 2845 | |
| 2846 | preempt_disable(); |
Eric Dumazet | 3680453 | 2008-11-19 14:25:35 -0800 | [diff] [blame] | 2847 | sock_prot_inuse_add(net, &packet_proto, 1); |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 2848 | preempt_enable(); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 2849 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2850 | return 0; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 2851 | out2: |
| 2852 | sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2853 | out: |
| 2854 | return err; |
| 2855 | } |
| 2856 | |
| 2857 | /* |
| 2858 | * Pull a packet from our receive queue and hand it to the user. |
| 2859 | * If necessary we block. |
| 2860 | */ |
| 2861 | |
| 2862 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 2863 | struct msghdr *msg, size_t len, int flags) |
| 2864 | { |
| 2865 | struct sock *sk = sock->sk; |
| 2866 | struct sk_buff *skb; |
| 2867 | int copied, err; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2868 | int vnet_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | |
| 2870 | err = -EINVAL; |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2871 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2872 | goto out; |
| 2873 | |
| 2874 | #if 0 |
| 2875 | /* What error should we return now? EUNATTACH? */ |
| 2876 | if (pkt_sk(sk)->ifindex < 0) |
| 2877 | return -ENODEV; |
| 2878 | #endif |
| 2879 | |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2880 | if (flags & MSG_ERRQUEUE) { |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2881 | err = sock_recv_errqueue(sk, msg, len, |
| 2882 | SOL_PACKET, PACKET_TX_TIMESTAMP); |
Richard Cochran | ed85b56 | 2010-04-07 22:41:28 +0000 | [diff] [blame] | 2883 | goto out; |
| 2884 | } |
| 2885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | * Call the generic datagram receiver. This handles all sorts |
| 2888 | * of horrible races and re-entrancy so we can forget about it |
| 2889 | * in the protocol layers. |
| 2890 | * |
| 2891 | * Now it will return ENETDOWN, if device have just gone down, |
| 2892 | * but then it will block. |
| 2893 | */ |
| 2894 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2895 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2896 | |
| 2897 | /* |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 2898 | * An error occurred so return it. Because skb_recv_datagram() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | * handles the blocking we don't see and worry about blocking |
| 2900 | * retries. |
| 2901 | */ |
| 2902 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 2903 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | goto out; |
| 2905 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2906 | if (pkt_sk(sk)->has_vnet_hdr) { |
| 2907 | struct virtio_net_hdr vnet_hdr = { 0 }; |
| 2908 | |
| 2909 | err = -EINVAL; |
| 2910 | vnet_hdr_len = sizeof(vnet_hdr); |
Mariusz Kozlowski | 1f18b71 | 2010-11-08 11:58:45 +0000 | [diff] [blame] | 2911 | if (len < vnet_hdr_len) |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2912 | goto out_free; |
| 2913 | |
Mariusz Kozlowski | 1f18b71 | 2010-11-08 11:58:45 +0000 | [diff] [blame] | 2914 | len -= vnet_hdr_len; |
| 2915 | |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2916 | if (skb_is_gso(skb)) { |
| 2917 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
| 2918 | |
| 2919 | /* This is a hint as to how much should be linear. */ |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2920 | vnet_hdr.hdr_len = |
| 2921 | __cpu_to_virtio16(false, skb_headlen(skb)); |
| 2922 | vnet_hdr.gso_size = |
| 2923 | __cpu_to_virtio16(false, sinfo->gso_size); |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2924 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
| 2925 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| 2926 | else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| 2927 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| 2928 | else if (sinfo->gso_type & SKB_GSO_UDP) |
| 2929 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| 2930 | else if (sinfo->gso_type & SKB_GSO_FCOE) |
| 2931 | goto out_free; |
| 2932 | else |
| 2933 | BUG(); |
| 2934 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| 2935 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| 2936 | } else |
| 2937 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 2938 | |
| 2939 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 2940 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
Michael S. Tsirkin | dc9e515 | 2014-11-23 18:16:19 +0200 | [diff] [blame^] | 2941 | vnet_hdr.csum_start = __cpu_to_virtio16(false, |
| 2942 | skb_checksum_start_offset(skb)); |
| 2943 | vnet_hdr.csum_offset = __cpu_to_virtio16(false, |
| 2944 | skb->csum_offset); |
Jason Wang | 10a8d94 | 2011-06-10 00:56:17 +0000 | [diff] [blame] | 2945 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
| 2946 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 2947 | } /* else everything is zero */ |
| 2948 | |
| 2949 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, |
| 2950 | vnet_hdr_len); |
| 2951 | if (err < 0) |
| 2952 | goto out_free; |
| 2953 | } |
| 2954 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2955 | /* You lose any data beyond the buffer you gave. If it worries |
| 2956 | * a user program they can ask the device for its MTU |
| 2957 | * anyway. |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 2958 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2959 | copied = skb->len; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 2960 | if (copied > len) { |
| 2961 | copied = len; |
| 2962 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | } |
| 2964 | |
| 2965 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 2966 | if (err) |
| 2967 | goto out_free; |
| 2968 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 2969 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2970 | |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2971 | if (msg->msg_name) { |
| 2972 | /* If the address length field is there to be filled |
| 2973 | * in, we fill it in now. |
| 2974 | */ |
| 2975 | if (sock->type == SOCK_PACKET) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2976 | __sockaddr_check_size(sizeof(struct sockaddr_pkt)); |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2977 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| 2978 | } else { |
| 2979 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
| 2980 | msg->msg_namelen = sll->sll_halen + |
| 2981 | offsetof(struct sockaddr_ll, sll_addr); |
| 2982 | } |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2983 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| 2984 | msg->msg_namelen); |
Hannes Frederic Sowa | f3d3342 | 2013-11-21 03:14:22 +0100 | [diff] [blame] | 2985 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2986 | |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 2987 | if (pkt_sk(sk)->auxdata) { |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 2988 | struct tpacket_auxdata aux; |
| 2989 | |
| 2990 | aux.tp_status = TP_STATUS_USER; |
| 2991 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 2992 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| 2993 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| 2994 | aux.tp_snaplen = skb->len; |
| 2995 | aux.tp_mac = 0; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 2996 | aux.tp_net = skb_network_offset(skb); |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 2997 | if (vlan_tx_tag_present(skb)) { |
| 2998 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 2999 | aux.tp_vlan_tpid = ntohs(skb->vlan_proto); |
| 3000 | aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 3001 | } else { |
| 3002 | aux.tp_vlan_tci = 0; |
Atzm Watanabe | a0cdfcf | 2013-12-17 22:53:40 +0900 | [diff] [blame] | 3003 | aux.tp_vlan_tpid = 0; |
Ben Greear | a3bcc23 | 2011-06-01 06:49:10 +0000 | [diff] [blame] | 3004 | } |
Herbert Xu | ffbc611 | 2007-02-04 23:33:10 -0800 | [diff] [blame] | 3005 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3006 | } |
| 3007 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | /* |
| 3009 | * Free or return the buffer as appropriate. Again this |
| 3010 | * hides all the races and re-entrancy issues from us. |
| 3011 | */ |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3012 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3013 | |
| 3014 | out_free: |
| 3015 | skb_free_datagram(sk, skb); |
| 3016 | out: |
| 3017 | return err; |
| 3018 | } |
| 3019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| 3021 | int *uaddr_len, int peer) |
| 3022 | { |
| 3023 | struct net_device *dev; |
| 3024 | struct sock *sk = sock->sk; |
| 3025 | |
| 3026 | if (peer) |
| 3027 | return -EOPNOTSUPP; |
| 3028 | |
| 3029 | uaddr->sa_family = AF_PACKET; |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 3030 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3031 | rcu_read_lock(); |
| 3032 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
| 3033 | if (dev) |
Daniel Borkmann | 2dc85bf | 2013-06-12 16:02:27 +0200 | [diff] [blame] | 3034 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3035 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | *uaddr_len = sizeof(*uaddr); |
| 3037 | |
| 3038 | return 0; |
| 3039 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | |
| 3041 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| 3042 | int *uaddr_len, int peer) |
| 3043 | { |
| 3044 | struct net_device *dev; |
| 3045 | struct sock *sk = sock->sk; |
| 3046 | struct packet_sock *po = pkt_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 3047 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3048 | |
| 3049 | if (peer) |
| 3050 | return -EOPNOTSUPP; |
| 3051 | |
| 3052 | sll->sll_family = AF_PACKET; |
| 3053 | sll->sll_ifindex = po->ifindex; |
| 3054 | sll->sll_protocol = po->num; |
Vasiliy Kulikov | 6728664 | 2010-11-10 12:09:10 -0800 | [diff] [blame] | 3055 | sll->sll_pkttype = 0; |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3056 | rcu_read_lock(); |
| 3057 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3058 | if (dev) { |
| 3059 | sll->sll_hatype = dev->type; |
| 3060 | sll->sll_halen = dev->addr_len; |
| 3061 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3062 | } else { |
| 3063 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| 3064 | sll->sll_halen = 0; |
| 3065 | } |
Eric Dumazet | 654d1f8 | 2009-11-02 10:43:32 +0100 | [diff] [blame] | 3066 | rcu_read_unlock(); |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3067 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | |
| 3069 | return 0; |
| 3070 | } |
| 3071 | |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3072 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| 3073 | int what) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3074 | { |
| 3075 | switch (i->type) { |
| 3076 | case PACKET_MR_MULTICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3077 | if (i->alen != dev->addr_len) |
| 3078 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | if (what > 0) |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 3080 | return dev_mc_add(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | else |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 3082 | return dev_mc_del(dev, i->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3083 | break; |
| 3084 | case PACKET_MR_PROMISC: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3085 | return dev_set_promiscuity(dev, what); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3086 | case PACKET_MR_ALLMULTI: |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3087 | return dev_set_allmulti(dev, what); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3088 | case PACKET_MR_UNICAST: |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3089 | if (i->alen != dev->addr_len) |
| 3090 | return -EINVAL; |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3091 | if (what > 0) |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 3092 | return dev_uc_add(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3093 | else |
Jiri Pirko | a748ee2 | 2010-04-01 21:22:09 +0000 | [diff] [blame] | 3094 | return dev_uc_del(dev, i->addr); |
Eric W. Biederman | d95ed92 | 2009-05-19 18:27:17 +0000 | [diff] [blame] | 3095 | break; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3096 | default: |
| 3097 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3098 | } |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3099 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3100 | } |
| 3101 | |
| 3102 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
| 3103 | { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3104 | for ( ; i; i = i->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3105 | if (i->ifindex == dev->ifindex) |
| 3106 | packet_dev_mc(dev, i, what); |
| 3107 | } |
| 3108 | } |
| 3109 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3110 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | { |
| 3112 | struct packet_sock *po = pkt_sk(sk); |
| 3113 | struct packet_mclist *ml, *i; |
| 3114 | struct net_device *dev; |
| 3115 | int err; |
| 3116 | |
| 3117 | rtnl_lock(); |
| 3118 | |
| 3119 | err = -ENODEV; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 3120 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3121 | if (!dev) |
| 3122 | goto done; |
| 3123 | |
| 3124 | err = -EINVAL; |
Jiri Pirko | 1162563 | 2010-03-02 20:40:01 +0000 | [diff] [blame] | 3125 | if (mreq->mr_alen > dev->addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | goto done; |
| 3127 | |
| 3128 | err = -ENOBUFS; |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 3129 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3130 | if (i == NULL) |
| 3131 | goto done; |
| 3132 | |
| 3133 | err = 0; |
| 3134 | for (ml = po->mclist; ml; ml = ml->next) { |
| 3135 | if (ml->ifindex == mreq->mr_ifindex && |
| 3136 | ml->type == mreq->mr_type && |
| 3137 | ml->alen == mreq->mr_alen && |
| 3138 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 3139 | ml->count++; |
| 3140 | /* Free the new element ... */ |
| 3141 | kfree(i); |
| 3142 | goto done; |
| 3143 | } |
| 3144 | } |
| 3145 | |
| 3146 | i->type = mreq->mr_type; |
| 3147 | i->ifindex = mreq->mr_ifindex; |
| 3148 | i->alen = mreq->mr_alen; |
| 3149 | memcpy(i->addr, mreq->mr_address, i->alen); |
| 3150 | i->count = 1; |
| 3151 | i->next = po->mclist; |
| 3152 | po->mclist = i; |
Wang Chen | 2aeb0b8 | 2008-07-14 20:49:46 -0700 | [diff] [blame] | 3153 | err = packet_dev_mc(dev, i, 1); |
| 3154 | if (err) { |
| 3155 | po->mclist = i->next; |
| 3156 | kfree(i); |
| 3157 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3158 | |
| 3159 | done: |
| 3160 | rtnl_unlock(); |
| 3161 | return err; |
| 3162 | } |
| 3163 | |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3164 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | { |
| 3166 | struct packet_mclist *ml, **mlp; |
| 3167 | |
| 3168 | rtnl_lock(); |
| 3169 | |
| 3170 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| 3171 | if (ml->ifindex == mreq->mr_ifindex && |
| 3172 | ml->type == mreq->mr_type && |
| 3173 | ml->alen == mreq->mr_alen && |
| 3174 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| 3175 | if (--ml->count == 0) { |
| 3176 | struct net_device *dev; |
| 3177 | *mlp = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 3178 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 3179 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3181 | kfree(ml); |
| 3182 | } |
| 3183 | rtnl_unlock(); |
| 3184 | return 0; |
| 3185 | } |
| 3186 | } |
| 3187 | rtnl_unlock(); |
| 3188 | return -EADDRNOTAVAIL; |
| 3189 | } |
| 3190 | |
| 3191 | static void packet_flush_mclist(struct sock *sk) |
| 3192 | { |
| 3193 | struct packet_sock *po = pkt_sk(sk); |
| 3194 | struct packet_mclist *ml; |
| 3195 | |
| 3196 | if (!po->mclist) |
| 3197 | return; |
| 3198 | |
| 3199 | rtnl_lock(); |
| 3200 | while ((ml = po->mclist) != NULL) { |
| 3201 | struct net_device *dev; |
| 3202 | |
| 3203 | po->mclist = ml->next; |
Eric Dumazet | ad959e7 | 2009-10-16 06:38:46 +0000 | [diff] [blame] | 3204 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| 3205 | if (dev != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3206 | packet_dev_mc(dev, ml, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3207 | kfree(ml); |
| 3208 | } |
| 3209 | rtnl_unlock(); |
| 3210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3211 | |
| 3212 | static int |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 3213 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3214 | { |
| 3215 | struct sock *sk = sock->sk; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3216 | struct packet_sock *po = pkt_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3217 | int ret; |
| 3218 | |
| 3219 | if (level != SOL_PACKET) |
| 3220 | return -ENOPROTOOPT; |
| 3221 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3222 | switch (optname) { |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3223 | case PACKET_ADD_MEMBERSHIP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | case PACKET_DROP_MEMBERSHIP: |
| 3225 | { |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3226 | struct packet_mreq_max mreq; |
| 3227 | int len = optlen; |
| 3228 | memset(&mreq, 0, sizeof(mreq)); |
| 3229 | if (len < sizeof(struct packet_mreq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3230 | return -EINVAL; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3231 | if (len > sizeof(mreq)) |
| 3232 | len = sizeof(mreq); |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3233 | if (copy_from_user(&mreq, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3234 | return -EFAULT; |
Eric W. Biederman | 0fb375f | 2005-09-21 00:11:37 -0700 | [diff] [blame] | 3235 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| 3236 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3237 | if (optname == PACKET_ADD_MEMBERSHIP) |
| 3238 | ret = packet_mc_add(sk, &mreq); |
| 3239 | else |
| 3240 | ret = packet_mc_drop(sk, &mreq); |
| 3241 | return ret; |
| 3242 | } |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3244 | case PACKET_RX_RING: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3245 | case PACKET_TX_RING: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3246 | { |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3247 | union tpacket_req_u req_u; |
| 3248 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3249 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3250 | switch (po->tp_version) { |
| 3251 | case TPACKET_V1: |
| 3252 | case TPACKET_V2: |
| 3253 | len = sizeof(req_u.req); |
| 3254 | break; |
| 3255 | case TPACKET_V3: |
| 3256 | default: |
| 3257 | len = sizeof(req_u.req3); |
| 3258 | break; |
| 3259 | } |
| 3260 | if (optlen < len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3261 | return -EINVAL; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3262 | if (pkt_sk(sk)->has_vnet_hdr) |
| 3263 | return -EINVAL; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3264 | if (copy_from_user(&req_u.req, optval, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | return -EFAULT; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3266 | return packet_set_ring(sk, &req_u, 0, |
| 3267 | optname == PACKET_TX_RING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3268 | } |
| 3269 | case PACKET_COPY_THRESH: |
| 3270 | { |
| 3271 | int val; |
| 3272 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3273 | if (optlen != sizeof(val)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3274 | return -EINVAL; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3275 | if (copy_from_user(&val, optval, sizeof(val))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3276 | return -EFAULT; |
| 3277 | |
| 3278 | pkt_sk(sk)->copy_thresh = val; |
| 3279 | return 0; |
| 3280 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3281 | case PACKET_VERSION: |
| 3282 | { |
| 3283 | int val; |
| 3284 | |
| 3285 | if (optlen != sizeof(val)) |
| 3286 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3287 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3288 | return -EBUSY; |
| 3289 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3290 | return -EFAULT; |
| 3291 | switch (val) { |
| 3292 | case TPACKET_V1: |
| 3293 | case TPACKET_V2: |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3294 | case TPACKET_V3: |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3295 | po->tp_version = val; |
| 3296 | return 0; |
| 3297 | default: |
| 3298 | return -EINVAL; |
| 3299 | } |
| 3300 | } |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3301 | case PACKET_RESERVE: |
| 3302 | { |
| 3303 | unsigned int val; |
| 3304 | |
| 3305 | if (optlen != sizeof(val)) |
| 3306 | return -EINVAL; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3307 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3308 | return -EBUSY; |
| 3309 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3310 | return -EFAULT; |
| 3311 | po->tp_reserve = val; |
| 3312 | return 0; |
| 3313 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3314 | case PACKET_LOSS: |
| 3315 | { |
| 3316 | unsigned int val; |
| 3317 | |
| 3318 | if (optlen != sizeof(val)) |
| 3319 | return -EINVAL; |
| 3320 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3321 | return -EBUSY; |
| 3322 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3323 | return -EFAULT; |
| 3324 | po->tp_loss = !!val; |
| 3325 | return 0; |
| 3326 | } |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3327 | case PACKET_AUXDATA: |
| 3328 | { |
| 3329 | int val; |
| 3330 | |
| 3331 | if (optlen < sizeof(val)) |
| 3332 | return -EINVAL; |
| 3333 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3334 | return -EFAULT; |
| 3335 | |
| 3336 | po->auxdata = !!val; |
| 3337 | return 0; |
| 3338 | } |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3339 | case PACKET_ORIGDEV: |
| 3340 | { |
| 3341 | int val; |
| 3342 | |
| 3343 | if (optlen < sizeof(val)) |
| 3344 | return -EINVAL; |
| 3345 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3346 | return -EFAULT; |
| 3347 | |
| 3348 | po->origdev = !!val; |
| 3349 | return 0; |
| 3350 | } |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3351 | case PACKET_VNET_HDR: |
| 3352 | { |
| 3353 | int val; |
| 3354 | |
| 3355 | if (sock->type != SOCK_RAW) |
| 3356 | return -EINVAL; |
| 3357 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3358 | return -EBUSY; |
| 3359 | if (optlen < sizeof(val)) |
| 3360 | return -EINVAL; |
| 3361 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3362 | return -EFAULT; |
| 3363 | |
| 3364 | po->has_vnet_hdr = !!val; |
| 3365 | return 0; |
| 3366 | } |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3367 | case PACKET_TIMESTAMP: |
| 3368 | { |
| 3369 | int val; |
| 3370 | |
| 3371 | if (optlen != sizeof(val)) |
| 3372 | return -EINVAL; |
| 3373 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3374 | return -EFAULT; |
| 3375 | |
| 3376 | po->tp_tstamp = val; |
| 3377 | return 0; |
| 3378 | } |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3379 | case PACKET_FANOUT: |
| 3380 | { |
| 3381 | int val; |
| 3382 | |
| 3383 | if (optlen != sizeof(val)) |
| 3384 | return -EINVAL; |
| 3385 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3386 | return -EFAULT; |
| 3387 | |
| 3388 | return fanout_add(sk, val & 0xffff, val >> 16); |
| 3389 | } |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3390 | case PACKET_TX_HAS_OFF: |
| 3391 | { |
| 3392 | unsigned int val; |
| 3393 | |
| 3394 | if (optlen != sizeof(val)) |
| 3395 | return -EINVAL; |
| 3396 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| 3397 | return -EBUSY; |
| 3398 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3399 | return -EFAULT; |
| 3400 | po->tp_tx_has_off = !!val; |
| 3401 | return 0; |
| 3402 | } |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 3403 | case PACKET_QDISC_BYPASS: |
| 3404 | { |
| 3405 | int val; |
| 3406 | |
| 3407 | if (optlen != sizeof(val)) |
| 3408 | return -EINVAL; |
| 3409 | if (copy_from_user(&val, optval, sizeof(val))) |
| 3410 | return -EFAULT; |
| 3411 | |
| 3412 | po->xmit = val ? packet_direct_xmit : dev_queue_xmit; |
| 3413 | return 0; |
| 3414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3415 | default: |
| 3416 | return -ENOPROTOOPT; |
| 3417 | } |
| 3418 | } |
| 3419 | |
| 3420 | static int packet_getsockopt(struct socket *sock, int level, int optname, |
| 3421 | char __user *optval, int __user *optlen) |
| 3422 | { |
| 3423 | int len; |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3424 | int val, lv = sizeof(val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3425 | struct sock *sk = sock->sk; |
| 3426 | struct packet_sock *po = pkt_sk(sk); |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3427 | void *data = &val; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3428 | union tpacket_stats_u st; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3429 | |
| 3430 | if (level != SOL_PACKET) |
| 3431 | return -ENOPROTOOPT; |
| 3432 | |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3433 | if (get_user(len, optlen)) |
| 3434 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3435 | |
| 3436 | if (len < 0) |
| 3437 | return -EINVAL; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3438 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3439 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3440 | case PACKET_STATISTICS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3441 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3442 | memcpy(&st, &po->stats, sizeof(st)); |
| 3443 | memset(&po->stats, 0, sizeof(po->stats)); |
| 3444 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 3445 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3446 | if (po->tp_version == TPACKET_V3) { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3447 | lv = sizeof(struct tpacket_stats_v3); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3448 | st.stats3.tp_packets += st.stats3.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3449 | data = &st.stats3; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3450 | } else { |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3451 | lv = sizeof(struct tpacket_stats); |
Willem de Bruijn | 8bcdeaf | 2013-08-19 16:40:22 -0400 | [diff] [blame] | 3452 | st.stats1.tp_packets += st.stats1.tp_drops; |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3453 | data = &st.stats1; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3454 | } |
Daniel Borkmann | ee80fbf | 2013-04-19 06:12:29 +0000 | [diff] [blame] | 3455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3456 | break; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3457 | case PACKET_AUXDATA: |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3458 | val = po->auxdata; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3459 | break; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3460 | case PACKET_ORIGDEV: |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3461 | val = po->origdev; |
Peter P. Waskiewicz Jr | 80feaac | 2007-04-20 16:05:39 -0700 | [diff] [blame] | 3462 | break; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3463 | case PACKET_VNET_HDR: |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3464 | val = po->has_vnet_hdr; |
Sridhar Samudrala | bfd5f4a | 2010-02-04 20:24:10 -0800 | [diff] [blame] | 3465 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3466 | case PACKET_VERSION: |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3467 | val = po->tp_version; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3468 | break; |
| 3469 | case PACKET_HDRLEN: |
| 3470 | if (len > sizeof(int)) |
| 3471 | len = sizeof(int); |
| 3472 | if (copy_from_user(&val, optval, len)) |
| 3473 | return -EFAULT; |
| 3474 | switch (val) { |
| 3475 | case TPACKET_V1: |
| 3476 | val = sizeof(struct tpacket_hdr); |
| 3477 | break; |
| 3478 | case TPACKET_V2: |
| 3479 | val = sizeof(struct tpacket2_hdr); |
| 3480 | break; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3481 | case TPACKET_V3: |
| 3482 | val = sizeof(struct tpacket3_hdr); |
| 3483 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3484 | default: |
| 3485 | return -EINVAL; |
| 3486 | } |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3487 | break; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3488 | case PACKET_RESERVE: |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3489 | val = po->tp_reserve; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3490 | break; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3491 | case PACKET_LOSS: |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3492 | val = po->tp_loss; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3493 | break; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3494 | case PACKET_TIMESTAMP: |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3495 | val = po->tp_tstamp; |
Scott McMillan | 614f60f | 2010-06-02 05:53:56 -0700 | [diff] [blame] | 3496 | break; |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3497 | case PACKET_FANOUT: |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3498 | val = (po->fanout ? |
| 3499 | ((u32)po->fanout->id | |
Willem de Bruijn | 77f65eb | 2013-03-19 10:18:11 +0000 | [diff] [blame] | 3500 | ((u32)po->fanout->type << 16) | |
| 3501 | ((u32)po->fanout->flags << 24)) : |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3502 | 0); |
David S. Miller | dc99f60 | 2011-07-05 01:45:05 -0700 | [diff] [blame] | 3503 | break; |
Paul Chavent | 5920cd3a | 2012-11-06 23:10:47 +0000 | [diff] [blame] | 3504 | case PACKET_TX_HAS_OFF: |
| 3505 | val = po->tp_tx_has_off; |
| 3506 | break; |
Daniel Borkmann | d346a3f | 2013-12-06 11:36:17 +0100 | [diff] [blame] | 3507 | case PACKET_QDISC_BYPASS: |
| 3508 | val = packet_use_direct_xmit(po); |
| 3509 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3510 | default: |
| 3511 | return -ENOPROTOOPT; |
| 3512 | } |
| 3513 | |
Eric Dumazet | c06fff6 | 2012-04-19 21:56:11 +0000 | [diff] [blame] | 3514 | if (len > lv) |
| 3515 | len = lv; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3516 | if (put_user(len, optlen)) |
| 3517 | return -EFAULT; |
Herbert Xu | 8dc4194 | 2007-02-04 23:31:32 -0800 | [diff] [blame] | 3518 | if (copy_to_user(optval, data, len)) |
| 3519 | return -EFAULT; |
Kris Katterjohn | 8ae55f0 | 2006-01-23 16:28:02 -0800 | [diff] [blame] | 3520 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3521 | } |
| 3522 | |
| 3523 | |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3524 | static int packet_notifier(struct notifier_block *this, |
| 3525 | unsigned long msg, void *ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3526 | { |
| 3527 | struct sock *sk; |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 3528 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 3529 | struct net *net = dev_net(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3530 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3531 | rcu_read_lock(); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 3532 | sk_for_each_rcu(sk, &net->packet.sklist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3533 | struct packet_sock *po = pkt_sk(sk); |
| 3534 | |
| 3535 | switch (msg) { |
| 3536 | case NETDEV_UNREGISTER: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | if (po->mclist) |
| 3538 | packet_dev_mclist(dev, po->mclist, -1); |
David S. Miller | a2efcfa | 2007-05-29 13:12:50 -0700 | [diff] [blame] | 3539 | /* fallthrough */ |
| 3540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | case NETDEV_DOWN: |
| 3542 | if (dev->ifindex == po->ifindex) { |
| 3543 | spin_lock(&po->bind_lock); |
| 3544 | if (po->running) { |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3545 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | sk->sk_err = ENETDOWN; |
| 3547 | if (!sock_flag(sk, SOCK_DEAD)) |
| 3548 | sk->sk_error_report(sk); |
| 3549 | } |
| 3550 | if (msg == NETDEV_UNREGISTER) { |
Daniel Borkmann | 66e56cd | 2013-12-06 11:36:15 +0100 | [diff] [blame] | 3551 | packet_cached_dev_reset(po); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3552 | po->ifindex = -1; |
Ben Greear | 160ff18 | 2011-06-01 07:18:52 +0000 | [diff] [blame] | 3553 | if (po->prot_hook.dev) |
| 3554 | dev_put(po->prot_hook.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | po->prot_hook.dev = NULL; |
| 3556 | } |
| 3557 | spin_unlock(&po->bind_lock); |
| 3558 | } |
| 3559 | break; |
| 3560 | case NETDEV_UP: |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3561 | if (dev->ifindex == po->ifindex) { |
| 3562 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3563 | if (po->num) |
| 3564 | register_prot_hook(sk); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3565 | spin_unlock(&po->bind_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3567 | break; |
| 3568 | } |
| 3569 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 3570 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3571 | return NOTIFY_DONE; |
| 3572 | } |
| 3573 | |
| 3574 | |
| 3575 | static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| 3576 | unsigned long arg) |
| 3577 | { |
| 3578 | struct sock *sk = sock->sk; |
| 3579 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3580 | switch (cmd) { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3581 | case SIOCOUTQ: |
| 3582 | { |
| 3583 | int amount = sk_wmem_alloc_get(sk); |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 3584 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3585 | return put_user(amount, (int __user *)arg); |
| 3586 | } |
| 3587 | case SIOCINQ: |
| 3588 | { |
| 3589 | struct sk_buff *skb; |
| 3590 | int amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3591 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3592 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 3593 | skb = skb_peek(&sk->sk_receive_queue); |
| 3594 | if (skb) |
| 3595 | amount = skb->len; |
| 3596 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 3597 | return put_user(amount, (int __user *)arg); |
| 3598 | } |
| 3599 | case SIOCGSTAMP: |
| 3600 | return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| 3601 | case SIOCGSTAMPNS: |
| 3602 | return sock_get_timestampns(sk, (struct timespec __user *)arg); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3604 | #ifdef CONFIG_INET |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3605 | case SIOCADDRT: |
| 3606 | case SIOCDELRT: |
| 3607 | case SIOCDARP: |
| 3608 | case SIOCGARP: |
| 3609 | case SIOCSARP: |
| 3610 | case SIOCGIFADDR: |
| 3611 | case SIOCSIFADDR: |
| 3612 | case SIOCGIFBRDADDR: |
| 3613 | case SIOCSIFBRDADDR: |
| 3614 | case SIOCGIFNETMASK: |
| 3615 | case SIOCSIFNETMASK: |
| 3616 | case SIOCGIFDSTADDR: |
| 3617 | case SIOCSIFDSTADDR: |
| 3618 | case SIOCSIFFLAGS: |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3619 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3620 | #endif |
| 3621 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3622 | default: |
| 3623 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3624 | } |
| 3625 | return 0; |
| 3626 | } |
| 3627 | |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3628 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3629 | poll_table *wait) |
| 3630 | { |
| 3631 | struct sock *sk = sock->sk; |
| 3632 | struct packet_sock *po = pkt_sk(sk); |
| 3633 | unsigned int mask = datagram_poll(file, sock, wait); |
| 3634 | |
| 3635 | spin_lock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3636 | if (po->rx_ring.pg_vec) { |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3637 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
| 3638 | TP_STATUS_KERNEL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3639 | mask |= POLLIN | POLLRDNORM; |
| 3640 | } |
| 3641 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3642 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 3643 | if (po->tx_ring.pg_vec) { |
| 3644 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
| 3645 | mask |= POLLOUT | POLLWRNORM; |
| 3646 | } |
| 3647 | spin_unlock_bh(&sk->sk_write_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3648 | return mask; |
| 3649 | } |
| 3650 | |
| 3651 | |
| 3652 | /* Dirty? Well, I still did not learn better way to account |
| 3653 | * for user mmaps. |
| 3654 | */ |
| 3655 | |
| 3656 | static void packet_mm_open(struct vm_area_struct *vma) |
| 3657 | { |
| 3658 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3659 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3660 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3662 | if (sk) |
| 3663 | atomic_inc(&pkt_sk(sk)->mapped); |
| 3664 | } |
| 3665 | |
| 3666 | static void packet_mm_close(struct vm_area_struct *vma) |
| 3667 | { |
| 3668 | struct file *file = vma->vm_file; |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3669 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3670 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3672 | if (sk) |
| 3673 | atomic_dec(&pkt_sk(sk)->mapped); |
| 3674 | } |
| 3675 | |
Alexey Dobriyan | f0f37e2f | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 3676 | static const struct vm_operations_struct packet_mmap_ops = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3677 | .open = packet_mm_open, |
| 3678 | .close = packet_mm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3679 | }; |
| 3680 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3681 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
| 3682 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3683 | { |
| 3684 | int i; |
| 3685 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3686 | for (i = 0; i < len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3687 | if (likely(pg_vec[i].buffer)) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3688 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3689 | vfree(pg_vec[i].buffer); |
| 3690 | else |
| 3691 | free_pages((unsigned long)pg_vec[i].buffer, |
| 3692 | order); |
| 3693 | pg_vec[i].buffer = NULL; |
| 3694 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3695 | } |
| 3696 | kfree(pg_vec); |
| 3697 | } |
| 3698 | |
Olof Johansson | eea49cc9 | 2011-11-02 11:00:49 +0000 | [diff] [blame] | 3699 | static char *alloc_one_pg_vec_page(unsigned long order) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3700 | { |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 3701 | char *buffer; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3702 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
| 3703 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; |
Eric Dumazet | 719bfea | 2009-04-15 03:39:52 -0700 | [diff] [blame] | 3704 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3705 | buffer = (char *) __get_free_pages(gfp_flags, order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3706 | if (buffer) |
| 3707 | return buffer; |
| 3708 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 3709 | /* __get_free_pages failed, fall back to vmalloc */ |
Eric Dumazet | bbce5a5 | 2010-11-20 07:31:54 +0000 | [diff] [blame] | 3710 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3711 | if (buffer) |
| 3712 | return buffer; |
| 3713 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 3714 | /* vmalloc failed, lets dig into swap here */ |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3715 | gfp_flags &= ~__GFP_NORETRY; |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 3716 | buffer = (char *) __get_free_pages(gfp_flags, order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3717 | if (buffer) |
| 3718 | return buffer; |
| 3719 | |
Daniel Borkmann | f0d4eb2 | 2014-01-19 11:46:53 +0100 | [diff] [blame] | 3720 | /* complete and utter failure */ |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3721 | return NULL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3722 | } |
| 3723 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3724 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3725 | { |
| 3726 | unsigned int block_nr = req->tp_block_nr; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3727 | struct pgv *pg_vec; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3728 | int i; |
| 3729 | |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3730 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3731 | if (unlikely(!pg_vec)) |
| 3732 | goto out; |
| 3733 | |
| 3734 | for (i = 0; i < block_nr; i++) { |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3735 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3736 | if (unlikely(!pg_vec[i].buffer)) |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3737 | goto out_free_pgvec; |
| 3738 | } |
| 3739 | |
| 3740 | out: |
| 3741 | return pg_vec; |
| 3742 | |
| 3743 | out_free_pgvec: |
| 3744 | free_pg_vec(pg_vec, order, block_nr); |
| 3745 | pg_vec = NULL; |
| 3746 | goto out; |
| 3747 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3748 | |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3749 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3750 | int closing, int tx_ring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3751 | { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3752 | struct pgv *pg_vec = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3753 | struct packet_sock *po = pkt_sk(sk); |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3754 | int was_running, order = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3755 | struct packet_ring_buffer *rb; |
| 3756 | struct sk_buff_head *rb_queue; |
Al Viro | 0e11c91 | 2006-11-08 00:26:29 -0800 | [diff] [blame] | 3757 | __be16 num; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3758 | int err = -EINVAL; |
| 3759 | /* Added to avoid minimal code churn */ |
| 3760 | struct tpacket_req *req = &req_u->req; |
| 3761 | |
| 3762 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ |
| 3763 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { |
| 3764 | WARN(1, "Tx-ring is not supported.\n"); |
| 3765 | goto out; |
| 3766 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3767 | |
| 3768 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
| 3769 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 3770 | |
| 3771 | err = -EBUSY; |
| 3772 | if (!closing) { |
| 3773 | if (atomic_read(&po->mapped)) |
| 3774 | goto out; |
Daniel Borkmann | b013840 | 2014-01-15 16:25:36 +0100 | [diff] [blame] | 3775 | if (packet_read_pending(rb)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3776 | goto out; |
| 3777 | } |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3779 | if (req->tp_block_nr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3780 | /* Sanity tests and some calculations */ |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3781 | err = -EBUSY; |
| 3782 | if (unlikely(rb->pg_vec)) |
| 3783 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3784 | |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3785 | switch (po->tp_version) { |
| 3786 | case TPACKET_V1: |
| 3787 | po->tp_hdrlen = TPACKET_HDRLEN; |
| 3788 | break; |
| 3789 | case TPACKET_V2: |
| 3790 | po->tp_hdrlen = TPACKET2_HDRLEN; |
| 3791 | break; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3792 | case TPACKET_V3: |
| 3793 | po->tp_hdrlen = TPACKET3_HDRLEN; |
| 3794 | break; |
Patrick McHardy | bbd6ef8 | 2008-07-14 22:50:15 -0700 | [diff] [blame] | 3795 | } |
| 3796 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3797 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3798 | if (unlikely((int)req->tp_block_size <= 0)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3799 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3800 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3801 | goto out; |
Eric Dumazet | dc80811 | 2014-08-15 09:16:04 -0700 | [diff] [blame] | 3802 | if (po->tp_version >= TPACKET_V3 && |
| 3803 | (int)(req->tp_block_size - |
| 3804 | BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0) |
| 3805 | goto out; |
Patrick McHardy | 8913336a | 2008-07-18 18:05:19 -0700 | [diff] [blame] | 3806 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3807 | po->tp_reserve)) |
| 3808 | goto out; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3809 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3810 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3811 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3812 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
| 3813 | if (unlikely(rb->frames_per_block <= 0)) |
| 3814 | goto out; |
| 3815 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
| 3816 | req->tp_frame_nr)) |
| 3817 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3818 | |
| 3819 | err = -ENOMEM; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3820 | order = get_order(req->tp_block_size); |
| 3821 | pg_vec = alloc_pg_vec(req, order); |
| 3822 | if (unlikely(!pg_vec)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3823 | goto out; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3824 | switch (po->tp_version) { |
| 3825 | case TPACKET_V3: |
| 3826 | /* Transmit path is not supported. We checked |
| 3827 | * it above but just being paranoid |
| 3828 | */ |
| 3829 | if (!tx_ring) |
| 3830 | init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring); |
Dan Carpenter | d7cf0c3 | 2014-02-18 15:20:51 +0300 | [diff] [blame] | 3831 | break; |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3832 | default: |
| 3833 | break; |
| 3834 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3835 | } |
| 3836 | /* Done */ |
| 3837 | else { |
| 3838 | err = -EINVAL; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3839 | if (unlikely(req->tp_frame_nr)) |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3840 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3841 | } |
| 3842 | |
| 3843 | lock_sock(sk); |
| 3844 | |
| 3845 | /* Detach socket from network */ |
| 3846 | spin_lock(&po->bind_lock); |
| 3847 | was_running = po->running; |
| 3848 | num = po->num; |
| 3849 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3850 | po->num = 0; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3851 | __unregister_prot_hook(sk, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3852 | } |
| 3853 | spin_unlock(&po->bind_lock); |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3855 | synchronize_net(); |
| 3856 | |
| 3857 | err = -EBUSY; |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3858 | mutex_lock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3859 | if (closing || atomic_read(&po->mapped) == 0) { |
| 3860 | err = 0; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3861 | spin_lock_bh(&rb_queue->lock); |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 3862 | swap(rb->pg_vec, pg_vec); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3863 | rb->frame_max = (req->tp_frame_nr - 1); |
| 3864 | rb->head = 0; |
| 3865 | rb->frame_size = req->tp_frame_size; |
| 3866 | spin_unlock_bh(&rb_queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3867 | |
Changli Gao | c053fd9 | 2010-12-10 16:02:20 -0800 | [diff] [blame] | 3868 | swap(rb->pg_vec_order, order); |
| 3869 | swap(rb->pg_vec_len, req->tp_block_nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3870 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3871 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| 3872 | po->prot_hook.func = (po->rx_ring.pg_vec) ? |
| 3873 | tpacket_rcv : packet_rcv; |
| 3874 | skb_queue_purge(rb_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3875 | if (atomic_read(&po->mapped)) |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 3876 | pr_err("packet_mmap: vma is busy: %d\n", |
| 3877 | atomic_read(&po->mapped)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3878 | } |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3879 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3880 | |
| 3881 | spin_lock(&po->bind_lock); |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3882 | if (was_running) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3883 | po->num = num; |
David S. Miller | ce06b03 | 2011-07-04 01:44:29 -0700 | [diff] [blame] | 3884 | register_prot_hook(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3885 | } |
| 3886 | spin_unlock(&po->bind_lock); |
chetan loke | f6fb8f1 | 2011-08-19 10:18:16 +0000 | [diff] [blame] | 3887 | if (closing && (po->tp_version > TPACKET_V2)) { |
| 3888 | /* Because we don't support block-based V3 on tx-ring */ |
| 3889 | if (!tx_ring) |
| 3890 | prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue); |
| 3891 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3892 | release_sock(sk); |
| 3893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | if (pg_vec) |
| 3895 | free_pg_vec(pg_vec, order, req->tp_block_nr); |
| 3896 | out: |
| 3897 | return err; |
| 3898 | } |
| 3899 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3900 | static int packet_mmap(struct file *file, struct socket *sock, |
| 3901 | struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3902 | { |
| 3903 | struct sock *sk = sock->sk; |
| 3904 | struct packet_sock *po = pkt_sk(sk); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3905 | unsigned long size, expected_size; |
| 3906 | struct packet_ring_buffer *rb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3907 | unsigned long start; |
| 3908 | int err = -EINVAL; |
| 3909 | int i; |
| 3910 | |
| 3911 | if (vma->vm_pgoff) |
| 3912 | return -EINVAL; |
| 3913 | |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3914 | mutex_lock(&po->pg_vec_lock); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3915 | |
| 3916 | expected_size = 0; |
| 3917 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 3918 | if (rb->pg_vec) { |
| 3919 | expected_size += rb->pg_vec_len |
| 3920 | * rb->pg_vec_pages |
| 3921 | * PAGE_SIZE; |
| 3922 | } |
| 3923 | } |
| 3924 | |
| 3925 | if (expected_size == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | goto out; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3927 | |
| 3928 | size = vma->vm_end - vma->vm_start; |
| 3929 | if (size != expected_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3930 | goto out; |
| 3931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3932 | start = vma->vm_start; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3933 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| 3934 | if (rb->pg_vec == NULL) |
| 3935 | continue; |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3936 | |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3937 | for (i = 0; i < rb->pg_vec_len; i++) { |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3938 | struct page *page; |
| 3939 | void *kaddr = rb->pg_vec[i].buffer; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3940 | int pg_num; |
| 3941 | |
Changli Gao | c56b4d9 | 2010-12-01 02:52:57 +0000 | [diff] [blame] | 3942 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
| 3943 | page = pgv_to_page(kaddr); |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3944 | err = vm_insert_page(vma, start, page); |
| 3945 | if (unlikely(err)) |
| 3946 | goto out; |
| 3947 | start += PAGE_SIZE; |
Neil Horman | 0e3125c | 2010-11-16 10:26:47 -0800 | [diff] [blame] | 3948 | kaddr += PAGE_SIZE; |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3949 | } |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3950 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3951 | } |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 3952 | |
David S. Miller | 4ebf0ae | 2005-12-06 16:38:35 -0800 | [diff] [blame] | 3953 | atomic_inc(&po->mapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3954 | vma->vm_ops = &packet_mmap_ops; |
| 3955 | err = 0; |
| 3956 | |
| 3957 | out: |
Herbert Xu | 905db44 | 2009-01-30 14:12:06 -0800 | [diff] [blame] | 3958 | mutex_unlock(&po->pg_vec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3959 | return err; |
| 3960 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3961 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3962 | static const struct proto_ops packet_ops_spkt = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3963 | .family = PF_PACKET, |
| 3964 | .owner = THIS_MODULE, |
| 3965 | .release = packet_release, |
| 3966 | .bind = packet_bind_spkt, |
| 3967 | .connect = sock_no_connect, |
| 3968 | .socketpair = sock_no_socketpair, |
| 3969 | .accept = sock_no_accept, |
| 3970 | .getname = packet_getname_spkt, |
| 3971 | .poll = datagram_poll, |
| 3972 | .ioctl = packet_ioctl, |
| 3973 | .listen = sock_no_listen, |
| 3974 | .shutdown = sock_no_shutdown, |
| 3975 | .setsockopt = sock_no_setsockopt, |
| 3976 | .getsockopt = sock_no_getsockopt, |
| 3977 | .sendmsg = packet_sendmsg_spkt, |
| 3978 | .recvmsg = packet_recvmsg, |
| 3979 | .mmap = sock_no_mmap, |
| 3980 | .sendpage = sock_no_sendpage, |
| 3981 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3982 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3983 | static const struct proto_ops packet_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3984 | .family = PF_PACKET, |
| 3985 | .owner = THIS_MODULE, |
| 3986 | .release = packet_release, |
| 3987 | .bind = packet_bind, |
| 3988 | .connect = sock_no_connect, |
| 3989 | .socketpair = sock_no_socketpair, |
| 3990 | .accept = sock_no_accept, |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 3991 | .getname = packet_getname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3992 | .poll = packet_poll, |
| 3993 | .ioctl = packet_ioctl, |
| 3994 | .listen = sock_no_listen, |
| 3995 | .shutdown = sock_no_shutdown, |
| 3996 | .setsockopt = packet_setsockopt, |
| 3997 | .getsockopt = packet_getsockopt, |
| 3998 | .sendmsg = packet_sendmsg, |
| 3999 | .recvmsg = packet_recvmsg, |
| 4000 | .mmap = packet_mmap, |
| 4001 | .sendpage = sock_no_sendpage, |
| 4002 | }; |
| 4003 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 4004 | static const struct net_proto_family packet_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4005 | .family = PF_PACKET, |
| 4006 | .create = packet_create, |
| 4007 | .owner = THIS_MODULE, |
| 4008 | }; |
| 4009 | |
| 4010 | static struct notifier_block packet_netdev_notifier = { |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4011 | .notifier_call = packet_notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4012 | }; |
| 4013 | |
| 4014 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4015 | |
| 4016 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4017 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4018 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4019 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4020 | |
| 4021 | rcu_read_lock(); |
| 4022 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | } |
| 4024 | |
| 4025 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 4026 | { |
Herbert Xu | 1bf4095 | 2007-12-16 14:04:02 -0800 | [diff] [blame] | 4027 | struct net *net = seq_file_net(seq); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4028 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4029 | } |
| 4030 | |
| 4031 | static void packet_seq_stop(struct seq_file *seq, void *v) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4032 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4033 | { |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 4034 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4035 | } |
| 4036 | |
YOSHIFUJI Hideaki | 1ce4f28 | 2007-02-09 23:25:10 +0900 | [diff] [blame] | 4037 | static int packet_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4038 | { |
| 4039 | if (v == SEQ_START_TOKEN) |
| 4040 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| 4041 | else { |
Li Zefan | b7ceabd | 2010-02-08 23:19:29 +0000 | [diff] [blame] | 4042 | struct sock *s = sk_entry(v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4043 | const struct packet_sock *po = pkt_sk(s); |
| 4044 | |
| 4045 | seq_printf(seq, |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 4046 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4047 | s, |
| 4048 | atomic_read(&s->sk_refcnt), |
| 4049 | s->sk_type, |
| 4050 | ntohs(po->num), |
| 4051 | po->ifindex, |
| 4052 | po->running, |
| 4053 | atomic_read(&s->sk_rmem_alloc), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 4054 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
Eric Dumazet | 40d4e3d | 2009-07-21 21:57:59 +0000 | [diff] [blame] | 4055 | sock_i_ino(s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4056 | } |
| 4057 | |
| 4058 | return 0; |
| 4059 | } |
| 4060 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 4061 | static const struct seq_operations packet_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4062 | .start = packet_seq_start, |
| 4063 | .next = packet_seq_next, |
| 4064 | .stop = packet_seq_stop, |
| 4065 | .show = packet_seq_show, |
| 4066 | }; |
| 4067 | |
| 4068 | static int packet_seq_open(struct inode *inode, struct file *file) |
| 4069 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4070 | return seq_open_net(inode, file, &packet_seq_ops, |
| 4071 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4072 | } |
| 4073 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 4074 | static const struct file_operations packet_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4075 | .owner = THIS_MODULE, |
| 4076 | .open = packet_seq_open, |
| 4077 | .read = seq_read, |
| 4078 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 4079 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4080 | }; |
| 4081 | |
| 4082 | #endif |
| 4083 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 4084 | static int __net_init packet_net_init(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4085 | { |
Pavel Emelyanov | 0fa7fa9 | 2012-08-21 01:06:47 +0000 | [diff] [blame] | 4086 | mutex_init(&net->packet.sklist_lock); |
Denis V. Lunev | 2aaef4e | 2007-12-11 04:19:54 -0800 | [diff] [blame] | 4087 | INIT_HLIST_HEAD(&net->packet.sklist); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4088 | |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 4089 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4090 | return -ENOMEM; |
| 4091 | |
| 4092 | return 0; |
| 4093 | } |
| 4094 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 4095 | static void __net_exit packet_net_exit(struct net *net) |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4096 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 4097 | remove_proc_entry("packet", net->proc_net); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4098 | } |
| 4099 | |
| 4100 | static struct pernet_operations packet_net_ops = { |
| 4101 | .init = packet_net_init, |
| 4102 | .exit = packet_net_exit, |
| 4103 | }; |
| 4104 | |
| 4105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4106 | static void __exit packet_exit(void) |
| 4107 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4108 | unregister_netdevice_notifier(&packet_netdev_notifier); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4109 | unregister_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4110 | sock_unregister(PF_PACKET); |
| 4111 | proto_unregister(&packet_proto); |
| 4112 | } |
| 4113 | |
| 4114 | static int __init packet_init(void) |
| 4115 | { |
| 4116 | int rc = proto_register(&packet_proto, 0); |
| 4117 | |
| 4118 | if (rc != 0) |
| 4119 | goto out; |
| 4120 | |
| 4121 | sock_register(&packet_family_ops); |
Denis V. Lunev | d12d01d | 2007-11-19 22:28:35 -0800 | [diff] [blame] | 4122 | register_pernet_subsys(&packet_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4123 | register_netdevice_notifier(&packet_netdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4124 | out: |
| 4125 | return rc; |
| 4126 | } |
| 4127 | |
| 4128 | module_init(packet_init); |
| 4129 | module_exit(packet_exit); |
| 4130 | MODULE_LICENSE("GPL"); |
| 4131 | MODULE_ALIAS_NETPROTO(PF_PACKET); |