Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic PPP layer for Linux. |
| 3 | * |
| 4 | * Copyright 1999-2002 Paul Mackerras. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * The generic PPP layer handles the PPP network interfaces, the |
| 12 | * /dev/ppp device, packet and VJ compression, and multilink. |
| 13 | * It talks to PPP `channels' via the interface defined in |
| 14 | * include/linux/ppp_channel.h. Channels provide the basic means for |
| 15 | * sending and receiving PPP frames on some kind of communications |
| 16 | * channel. |
| 17 | * |
| 18 | * Part of the code in this driver was inspired by the old async-only |
| 19 | * PPP driver, written by Michael Callahan and Al Longyear, and |
| 20 | * subsequently hacked by Paul Mackerras. |
| 21 | * |
| 22 | * ==FILEVERSION 20041108== |
| 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/kmod.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/list.h> |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 30 | #include <linux/idr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/poll.h> |
| 33 | #include <linux/ppp_defs.h> |
| 34 | #include <linux/filter.h> |
| 35 | #include <linux/if_ppp.h> |
| 36 | #include <linux/ppp_channel.h> |
| 37 | #include <linux/ppp-comp.h> |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/rtnetlink.h> |
| 40 | #include <linux/if_arp.h> |
| 41 | #include <linux/ip.h> |
| 42 | #include <linux/tcp.h> |
Jonathan Corbet | f2b9857 | 2008-05-18 15:32:43 -0600 | [diff] [blame] | 43 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/rwsem.h> |
| 46 | #include <linux/stddef.h> |
| 47 | #include <linux/device.h> |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 48 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 49 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <net/slhc_vj.h> |
| 51 | #include <asm/atomic.h> |
| 52 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 53 | #include <linux/nsproxy.h> |
| 54 | #include <net/net_namespace.h> |
| 55 | #include <net/netns/generic.h> |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #define PPP_VERSION "2.4.2" |
| 58 | |
| 59 | /* |
| 60 | * Network protocols we support. |
| 61 | */ |
| 62 | #define NP_IP 0 /* Internet Protocol V4 */ |
| 63 | #define NP_IPV6 1 /* Internet Protocol V6 */ |
| 64 | #define NP_IPX 2 /* IPX protocol */ |
| 65 | #define NP_AT 3 /* Appletalk protocol */ |
| 66 | #define NP_MPLS_UC 4 /* MPLS unicast */ |
| 67 | #define NP_MPLS_MC 5 /* MPLS multicast */ |
| 68 | #define NUM_NP 6 /* Number of NPs. */ |
| 69 | |
| 70 | #define MPHDRLEN 6 /* multilink protocol header length */ |
| 71 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ |
| 72 | #define MIN_FRAG_SIZE 64 |
| 73 | |
| 74 | /* |
| 75 | * An instance of /dev/ppp can be associated with either a ppp |
| 76 | * interface unit or a ppp channel. In both cases, file->private_data |
| 77 | * points to one of these. |
| 78 | */ |
| 79 | struct ppp_file { |
| 80 | enum { |
| 81 | INTERFACE=1, CHANNEL |
| 82 | } kind; |
| 83 | struct sk_buff_head xq; /* pppd transmit queue */ |
| 84 | struct sk_buff_head rq; /* receive queue for pppd */ |
| 85 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ |
| 86 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ |
| 87 | int hdrlen; /* space to leave for headers */ |
| 88 | int index; /* interface unit / channel number */ |
| 89 | int dead; /* unit/channel has been shut down */ |
| 90 | }; |
| 91 | |
Robert P. J. Day | b385a14 | 2007-02-10 01:46:25 -0800 | [diff] [blame] | 92 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) |
| 95 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | /* |
| 98 | * Data structure describing one ppp unit. |
| 99 | * A ppp unit corresponds to a ppp network interface device |
| 100 | * and represents a multilink bundle. |
| 101 | * It can have 0 or more ppp channels connected to it. |
| 102 | */ |
| 103 | struct ppp { |
| 104 | struct ppp_file file; /* stuff for read/write/poll 0 */ |
| 105 | struct file *owner; /* file that owns this unit 48 */ |
| 106 | struct list_head channels; /* list of attached channels 4c */ |
| 107 | int n_channels; /* how many channels are attached 54 */ |
| 108 | spinlock_t rlock; /* lock for receive side 58 */ |
| 109 | spinlock_t wlock; /* lock for transmit side 5c */ |
| 110 | int mru; /* max receive unit 60 */ |
| 111 | unsigned int flags; /* control bits 64 */ |
| 112 | unsigned int xstate; /* transmit state bits 68 */ |
| 113 | unsigned int rstate; /* receive state bits 6c */ |
| 114 | int debug; /* debug flags 70 */ |
| 115 | struct slcompress *vj; /* state for VJ header compression */ |
| 116 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ |
| 117 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ |
| 118 | struct compressor *xcomp; /* transmit packet compressor 8c */ |
| 119 | void *xc_state; /* its internal state 90 */ |
| 120 | struct compressor *rcomp; /* receive decompressor 94 */ |
| 121 | void *rc_state; /* its internal state 98 */ |
| 122 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ |
| 123 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ |
| 124 | struct net_device *dev; /* network interface device a4 */ |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 125 | int closing; /* is device closing down? a8 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #ifdef CONFIG_PPP_MULTILINK |
| 127 | int nxchan; /* next channel to send something on */ |
| 128 | u32 nxseq; /* next sequence number to send */ |
| 129 | int mrru; /* MP: max reconst. receive unit */ |
| 130 | u32 nextseq; /* MP: seq no of next packet */ |
| 131 | u32 minseq; /* MP: min of most recent seqnos */ |
| 132 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ |
| 133 | #endif /* CONFIG_PPP_MULTILINK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | #ifdef CONFIG_PPP_FILTER |
| 135 | struct sock_filter *pass_filter; /* filter for packets to pass */ |
| 136 | struct sock_filter *active_filter;/* filter for pkts to reset idle */ |
| 137 | unsigned pass_len, active_len; |
| 138 | #endif /* CONFIG_PPP_FILTER */ |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 139 | struct net *ppp_net; /* the net we belong to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | }; |
| 141 | |
| 142 | /* |
| 143 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 144 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
| 145 | * SC_MUST_COMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
| 147 | * Bits in xstate: SC_COMP_RUN |
| 148 | */ |
| 149 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ |
| 150 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 151 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | /* |
| 154 | * Private data structure for each channel. |
| 155 | * This includes the data structure used for multilink. |
| 156 | */ |
| 157 | struct channel { |
| 158 | struct ppp_file file; /* stuff for read/write/poll */ |
| 159 | struct list_head list; /* link in all/new_channels list */ |
| 160 | struct ppp_channel *chan; /* public channel data structure */ |
| 161 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ |
| 162 | spinlock_t downl; /* protects `chan', file.xq dequeue */ |
| 163 | struct ppp *ppp; /* ppp unit we're connected to */ |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 164 | struct net *chan_net; /* the net channel belongs to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | struct list_head clist; /* link in list of channels per unit */ |
| 166 | rwlock_t upl; /* protects `ppp' */ |
| 167 | #ifdef CONFIG_PPP_MULTILINK |
| 168 | u8 avail; /* flag used in multilink stuff */ |
| 169 | u8 had_frag; /* >= 1 fragments have been sent */ |
| 170 | u32 lastseq; /* MP: last sequence # received */ |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 171 | int speed; /* speed of the corresponding ppp channel*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | #endif /* CONFIG_PPP_MULTILINK */ |
| 173 | }; |
| 174 | |
| 175 | /* |
| 176 | * SMP locking issues: |
| 177 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels |
| 178 | * list and the ppp.n_channels field, you need to take both locks |
| 179 | * before you modify them. |
| 180 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> |
| 181 | * channel.downl. |
| 182 | */ |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | static atomic_t channel_count = ATOMIC_INIT(0); |
| 186 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 187 | /* per-net private data for this module */ |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 188 | static int ppp_net_id __read_mostly; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 189 | struct ppp_net { |
| 190 | /* units to ppp mapping */ |
| 191 | struct idr units_idr; |
| 192 | |
| 193 | /* |
| 194 | * all_ppp_mutex protects the units_idr mapping. |
| 195 | * It also ensures that finding a ppp unit in the units_idr |
| 196 | * map and updating its file.refcnt field is atomic. |
| 197 | */ |
| 198 | struct mutex all_ppp_mutex; |
| 199 | |
| 200 | /* channels */ |
| 201 | struct list_head all_channels; |
| 202 | struct list_head new_channels; |
| 203 | int last_channel_index; |
| 204 | |
| 205 | /* |
| 206 | * all_channels_lock protects all_channels and |
| 207 | * last_channel_index, and the atomicity of find |
| 208 | * a channel and updating its file.refcnt field. |
| 209 | */ |
| 210 | spinlock_t all_channels_lock; |
| 211 | }; |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /* Get the PPP protocol number from a skb */ |
| 214 | #define PPP_PROTO(skb) (((skb)->data[0] << 8) + (skb)->data[1]) |
| 215 | |
| 216 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ |
| 217 | #define PPP_MAX_RQLEN 32 |
| 218 | |
| 219 | /* |
| 220 | * Maximum number of multilink fragments queued up. |
| 221 | * This has to be large enough to cope with the maximum latency of |
| 222 | * the slowest channel relative to the others. Strictly it should |
| 223 | * depend on the number of channels and their characteristics. |
| 224 | */ |
| 225 | #define PPP_MP_MAX_QLEN 128 |
| 226 | |
| 227 | /* Multilink header bits. */ |
| 228 | #define B 0x80 /* this fragment begins a packet */ |
| 229 | #define E 0x40 /* this fragment ends a packet */ |
| 230 | |
| 231 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ |
| 232 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) |
| 233 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) |
| 234 | |
| 235 | /* Prototypes. */ |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 236 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
| 237 | struct file *file, unsigned int cmd, unsigned long arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | static void ppp_xmit_process(struct ppp *ppp); |
| 239 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); |
| 240 | static void ppp_push(struct ppp *ppp); |
| 241 | static void ppp_channel_push(struct channel *pch); |
| 242 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, |
| 243 | struct channel *pch); |
| 244 | static void ppp_receive_error(struct ppp *ppp); |
| 245 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); |
| 246 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, |
| 247 | struct sk_buff *skb); |
| 248 | #ifdef CONFIG_PPP_MULTILINK |
| 249 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, |
| 250 | struct channel *pch); |
| 251 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); |
| 252 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); |
| 253 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); |
| 254 | #endif /* CONFIG_PPP_MULTILINK */ |
| 255 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); |
| 256 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); |
| 257 | static void ppp_ccp_closed(struct ppp *ppp); |
| 258 | static struct compressor *find_compressor(int type); |
| 259 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 260 | static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | static void init_ppp_file(struct ppp_file *pf, int kind); |
| 262 | static void ppp_shutdown_interface(struct ppp *ppp); |
| 263 | static void ppp_destroy_interface(struct ppp *ppp); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 264 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
| 265 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | static int ppp_connect_channel(struct channel *pch, int unit); |
| 267 | static int ppp_disconnect_channel(struct channel *pch); |
| 268 | static void ppp_destroy_channel(struct channel *pch); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 269 | static int unit_get(struct idr *p, void *ptr); |
Cyrill Gorcunov | 8599757 | 2009-01-12 22:11:56 -0800 | [diff] [blame] | 270 | static int unit_set(struct idr *p, void *ptr, int n); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 271 | static void unit_put(struct idr *p, int n); |
| 272 | static void *unit_find(struct idr *p, int n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame] | 274 | static struct class *ppp_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 276 | /* per net-namespace data */ |
| 277 | static inline struct ppp_net *ppp_pernet(struct net *net) |
| 278 | { |
| 279 | BUG_ON(!net); |
| 280 | |
| 281 | return net_generic(net, ppp_net_id); |
| 282 | } |
| 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
| 285 | static inline int proto_to_npindex(int proto) |
| 286 | { |
| 287 | switch (proto) { |
| 288 | case PPP_IP: |
| 289 | return NP_IP; |
| 290 | case PPP_IPV6: |
| 291 | return NP_IPV6; |
| 292 | case PPP_IPX: |
| 293 | return NP_IPX; |
| 294 | case PPP_AT: |
| 295 | return NP_AT; |
| 296 | case PPP_MPLS_UC: |
| 297 | return NP_MPLS_UC; |
| 298 | case PPP_MPLS_MC: |
| 299 | return NP_MPLS_MC; |
| 300 | } |
| 301 | return -EINVAL; |
| 302 | } |
| 303 | |
| 304 | /* Translates an NP index into a PPP protocol number */ |
| 305 | static const int npindex_to_proto[NUM_NP] = { |
| 306 | PPP_IP, |
| 307 | PPP_IPV6, |
| 308 | PPP_IPX, |
| 309 | PPP_AT, |
| 310 | PPP_MPLS_UC, |
| 311 | PPP_MPLS_MC, |
| 312 | }; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | /* Translates an ethertype into an NP index */ |
| 315 | static inline int ethertype_to_npindex(int ethertype) |
| 316 | { |
| 317 | switch (ethertype) { |
| 318 | case ETH_P_IP: |
| 319 | return NP_IP; |
| 320 | case ETH_P_IPV6: |
| 321 | return NP_IPV6; |
| 322 | case ETH_P_IPX: |
| 323 | return NP_IPX; |
| 324 | case ETH_P_PPPTALK: |
| 325 | case ETH_P_ATALK: |
| 326 | return NP_AT; |
| 327 | case ETH_P_MPLS_UC: |
| 328 | return NP_MPLS_UC; |
| 329 | case ETH_P_MPLS_MC: |
| 330 | return NP_MPLS_MC; |
| 331 | } |
| 332 | return -1; |
| 333 | } |
| 334 | |
| 335 | /* Translates an NP index into an ethertype */ |
| 336 | static const int npindex_to_ethertype[NUM_NP] = { |
| 337 | ETH_P_IP, |
| 338 | ETH_P_IPV6, |
| 339 | ETH_P_IPX, |
| 340 | ETH_P_PPPTALK, |
| 341 | ETH_P_MPLS_UC, |
| 342 | ETH_P_MPLS_MC, |
| 343 | }; |
| 344 | |
| 345 | /* |
| 346 | * Locking shorthand. |
| 347 | */ |
| 348 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) |
| 349 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) |
| 350 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) |
| 351 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) |
| 352 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ |
| 353 | ppp_recv_lock(ppp); } while (0) |
| 354 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ |
| 355 | ppp_xmit_unlock(ppp); } while (0) |
| 356 | |
| 357 | /* |
| 358 | * /dev/ppp device routines. |
| 359 | * The /dev/ppp device is used by pppd to control the ppp unit. |
| 360 | * It supports the read, write, ioctl and poll functions. |
| 361 | * Open instances of /dev/ppp can be in one of three states: |
| 362 | * unattached, attached to a ppp unit, or attached to a ppp channel. |
| 363 | */ |
| 364 | static int ppp_open(struct inode *inode, struct file *file) |
| 365 | { |
Jonathan Corbet | f2b9857 | 2008-05-18 15:32:43 -0600 | [diff] [blame] | 366 | cycle_kernel_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /* |
| 368 | * This could (should?) be enforced by the permissions on /dev/ppp. |
| 369 | */ |
| 370 | if (!capable(CAP_NET_ADMIN)) |
| 371 | return -EPERM; |
| 372 | return 0; |
| 373 | } |
| 374 | |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 375 | static int ppp_release(struct inode *unused, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
| 377 | struct ppp_file *pf = file->private_data; |
| 378 | struct ppp *ppp; |
| 379 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 380 | if (pf) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | file->private_data = NULL; |
| 382 | if (pf->kind == INTERFACE) { |
| 383 | ppp = PF_TO_PPP(pf); |
| 384 | if (file == ppp->owner) |
| 385 | ppp_shutdown_interface(ppp); |
| 386 | } |
| 387 | if (atomic_dec_and_test(&pf->refcnt)) { |
| 388 | switch (pf->kind) { |
| 389 | case INTERFACE: |
| 390 | ppp_destroy_interface(PF_TO_PPP(pf)); |
| 391 | break; |
| 392 | case CHANNEL: |
| 393 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); |
| 394 | break; |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | static ssize_t ppp_read(struct file *file, char __user *buf, |
| 402 | size_t count, loff_t *ppos) |
| 403 | { |
| 404 | struct ppp_file *pf = file->private_data; |
| 405 | DECLARE_WAITQUEUE(wait, current); |
| 406 | ssize_t ret; |
| 407 | struct sk_buff *skb = NULL; |
Simon Arlott | 19937d0 | 2010-05-03 10:20:27 +0000 | [diff] [blame] | 408 | struct iovec iov; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
| 410 | ret = count; |
| 411 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 412 | if (!pf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | return -ENXIO; |
| 414 | add_wait_queue(&pf->rwait, &wait); |
| 415 | for (;;) { |
| 416 | set_current_state(TASK_INTERRUPTIBLE); |
| 417 | skb = skb_dequeue(&pf->rq); |
| 418 | if (skb) |
| 419 | break; |
| 420 | ret = 0; |
| 421 | if (pf->dead) |
| 422 | break; |
| 423 | if (pf->kind == INTERFACE) { |
| 424 | /* |
| 425 | * Return 0 (EOF) on an interface that has no |
| 426 | * channels connected, unless it is looping |
| 427 | * network traffic (demand mode). |
| 428 | */ |
| 429 | struct ppp *ppp = PF_TO_PPP(pf); |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 430 | if (ppp->n_channels == 0 && |
| 431 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | break; |
| 433 | } |
| 434 | ret = -EAGAIN; |
| 435 | if (file->f_flags & O_NONBLOCK) |
| 436 | break; |
| 437 | ret = -ERESTARTSYS; |
| 438 | if (signal_pending(current)) |
| 439 | break; |
| 440 | schedule(); |
| 441 | } |
| 442 | set_current_state(TASK_RUNNING); |
| 443 | remove_wait_queue(&pf->rwait, &wait); |
| 444 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 445 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto out; |
| 447 | |
| 448 | ret = -EOVERFLOW; |
| 449 | if (skb->len > count) |
| 450 | goto outf; |
| 451 | ret = -EFAULT; |
Simon Arlott | 19937d0 | 2010-05-03 10:20:27 +0000 | [diff] [blame] | 452 | iov.iov_base = buf; |
| 453 | iov.iov_len = count; |
| 454 | if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | goto outf; |
| 456 | ret = skb->len; |
| 457 | |
| 458 | outf: |
| 459 | kfree_skb(skb); |
| 460 | out: |
| 461 | return ret; |
| 462 | } |
| 463 | |
| 464 | static ssize_t ppp_write(struct file *file, const char __user *buf, |
| 465 | size_t count, loff_t *ppos) |
| 466 | { |
| 467 | struct ppp_file *pf = file->private_data; |
| 468 | struct sk_buff *skb; |
| 469 | ssize_t ret; |
| 470 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 471 | if (!pf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | return -ENXIO; |
| 473 | ret = -ENOMEM; |
| 474 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 475 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | goto out; |
| 477 | skb_reserve(skb, pf->hdrlen); |
| 478 | ret = -EFAULT; |
| 479 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
| 480 | kfree_skb(skb); |
| 481 | goto out; |
| 482 | } |
| 483 | |
| 484 | skb_queue_tail(&pf->xq, skb); |
| 485 | |
| 486 | switch (pf->kind) { |
| 487 | case INTERFACE: |
| 488 | ppp_xmit_process(PF_TO_PPP(pf)); |
| 489 | break; |
| 490 | case CHANNEL: |
| 491 | ppp_channel_push(PF_TO_CHANNEL(pf)); |
| 492 | break; |
| 493 | } |
| 494 | |
| 495 | ret = count; |
| 496 | |
| 497 | out: |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | /* No kernel lock - fine */ |
| 502 | static unsigned int ppp_poll(struct file *file, poll_table *wait) |
| 503 | { |
| 504 | struct ppp_file *pf = file->private_data; |
| 505 | unsigned int mask; |
| 506 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 507 | if (!pf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return 0; |
| 509 | poll_wait(file, &pf->rwait, wait); |
| 510 | mask = POLLOUT | POLLWRNORM; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 511 | if (skb_peek(&pf->rq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | mask |= POLLIN | POLLRDNORM; |
| 513 | if (pf->dead) |
| 514 | mask |= POLLHUP; |
| 515 | else if (pf->kind == INTERFACE) { |
| 516 | /* see comment in ppp_read */ |
| 517 | struct ppp *ppp = PF_TO_PPP(pf); |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 518 | if (ppp->n_channels == 0 && |
| 519 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | mask |= POLLIN | POLLRDNORM; |
| 521 | } |
| 522 | |
| 523 | return mask; |
| 524 | } |
| 525 | |
| 526 | #ifdef CONFIG_PPP_FILTER |
| 527 | static int get_filter(void __user *arg, struct sock_filter **p) |
| 528 | { |
| 529 | struct sock_fprog uprog; |
| 530 | struct sock_filter *code = NULL; |
| 531 | int len, err; |
| 532 | |
| 533 | if (copy_from_user(&uprog, arg, sizeof(uprog))) |
| 534 | return -EFAULT; |
| 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | if (!uprog.len) { |
| 537 | *p = NULL; |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | len = uprog.len * sizeof(struct sock_filter); |
| 542 | code = kmalloc(len, GFP_KERNEL); |
| 543 | if (code == NULL) |
| 544 | return -ENOMEM; |
| 545 | |
| 546 | if (copy_from_user(code, uprog.filter, len)) { |
| 547 | kfree(code); |
| 548 | return -EFAULT; |
| 549 | } |
| 550 | |
| 551 | err = sk_chk_filter(code, uprog.len); |
| 552 | if (err) { |
| 553 | kfree(code); |
| 554 | return err; |
| 555 | } |
| 556 | |
| 557 | *p = code; |
| 558 | return uprog.len; |
| 559 | } |
| 560 | #endif /* CONFIG_PPP_FILTER */ |
| 561 | |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 562 | static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
| 564 | struct ppp_file *pf = file->private_data; |
| 565 | struct ppp *ppp; |
| 566 | int err = -EFAULT, val, val2, i; |
| 567 | struct ppp_idle idle; |
| 568 | struct npioctl npi; |
| 569 | int unit, cflags; |
| 570 | struct slcompress *vj; |
| 571 | void __user *argp = (void __user *)arg; |
| 572 | int __user *p = argp; |
| 573 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 574 | if (!pf) |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 575 | return ppp_unattached_ioctl(current->nsproxy->net_ns, |
| 576 | pf, file, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
| 578 | if (cmd == PPPIOCDETACH) { |
| 579 | /* |
| 580 | * We have to be careful here... if the file descriptor |
| 581 | * has been dup'd, we could have another process in the |
| 582 | * middle of a poll using the same file *, so we had |
| 583 | * better not free the interface data structures - |
| 584 | * instead we fail the ioctl. Even in this case, we |
| 585 | * shut down the interface if we are the owner of it. |
| 586 | * Actually, we should get rid of PPPIOCDETACH, userland |
| 587 | * (i.e. pppd) could achieve the same effect by closing |
| 588 | * this fd and reopening /dev/ppp. |
| 589 | */ |
| 590 | err = -EINVAL; |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 591 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | if (pf->kind == INTERFACE) { |
| 593 | ppp = PF_TO_PPP(pf); |
| 594 | if (file == ppp->owner) |
| 595 | ppp_shutdown_interface(ppp); |
| 596 | } |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 597 | if (atomic_long_read(&file->f_count) <= 2) { |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 598 | ppp_release(NULL, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | err = 0; |
| 600 | } else |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 601 | printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%ld\n", |
| 602 | atomic_long_read(&file->f_count)); |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 603 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | return err; |
| 605 | } |
| 606 | |
| 607 | if (pf->kind == CHANNEL) { |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 608 | struct channel *pch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | struct ppp_channel *chan; |
| 610 | |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 611 | lock_kernel(); |
| 612 | pch = PF_TO_CHANNEL(pf); |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | switch (cmd) { |
| 615 | case PPPIOCCONNECT: |
| 616 | if (get_user(unit, p)) |
| 617 | break; |
| 618 | err = ppp_connect_channel(pch, unit); |
| 619 | break; |
| 620 | |
| 621 | case PPPIOCDISCONN: |
| 622 | err = ppp_disconnect_channel(pch); |
| 623 | break; |
| 624 | |
| 625 | default: |
| 626 | down_read(&pch->chan_sem); |
| 627 | chan = pch->chan; |
| 628 | err = -ENOTTY; |
| 629 | if (chan && chan->ops->ioctl) |
| 630 | err = chan->ops->ioctl(chan, cmd, arg); |
| 631 | up_read(&pch->chan_sem); |
| 632 | } |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 633 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | return err; |
| 635 | } |
| 636 | |
| 637 | if (pf->kind != INTERFACE) { |
| 638 | /* can't happen */ |
| 639 | printk(KERN_ERR "PPP: not interface or channel??\n"); |
| 640 | return -EINVAL; |
| 641 | } |
| 642 | |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 643 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | ppp = PF_TO_PPP(pf); |
| 645 | switch (cmd) { |
| 646 | case PPPIOCSMRU: |
| 647 | if (get_user(val, p)) |
| 648 | break; |
| 649 | ppp->mru = val; |
| 650 | err = 0; |
| 651 | break; |
| 652 | |
| 653 | case PPPIOCSFLAGS: |
| 654 | if (get_user(val, p)) |
| 655 | break; |
| 656 | ppp_lock(ppp); |
| 657 | cflags = ppp->flags & ~val; |
| 658 | ppp->flags = val & SC_FLAG_BITS; |
| 659 | ppp_unlock(ppp); |
| 660 | if (cflags & SC_CCP_OPEN) |
| 661 | ppp_ccp_closed(ppp); |
| 662 | err = 0; |
| 663 | break; |
| 664 | |
| 665 | case PPPIOCGFLAGS: |
| 666 | val = ppp->flags | ppp->xstate | ppp->rstate; |
| 667 | if (put_user(val, p)) |
| 668 | break; |
| 669 | err = 0; |
| 670 | break; |
| 671 | |
| 672 | case PPPIOCSCOMPRESS: |
| 673 | err = ppp_set_compress(ppp, arg); |
| 674 | break; |
| 675 | |
| 676 | case PPPIOCGUNIT: |
| 677 | if (put_user(ppp->file.index, p)) |
| 678 | break; |
| 679 | err = 0; |
| 680 | break; |
| 681 | |
| 682 | case PPPIOCSDEBUG: |
| 683 | if (get_user(val, p)) |
| 684 | break; |
| 685 | ppp->debug = val; |
| 686 | err = 0; |
| 687 | break; |
| 688 | |
| 689 | case PPPIOCGDEBUG: |
| 690 | if (put_user(ppp->debug, p)) |
| 691 | break; |
| 692 | err = 0; |
| 693 | break; |
| 694 | |
| 695 | case PPPIOCGIDLE: |
| 696 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; |
| 697 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; |
| 698 | if (copy_to_user(argp, &idle, sizeof(idle))) |
| 699 | break; |
| 700 | err = 0; |
| 701 | break; |
| 702 | |
| 703 | case PPPIOCSMAXCID: |
| 704 | if (get_user(val, p)) |
| 705 | break; |
| 706 | val2 = 15; |
| 707 | if ((val >> 16) != 0) { |
| 708 | val2 = val >> 16; |
| 709 | val &= 0xffff; |
| 710 | } |
| 711 | vj = slhc_init(val2+1, val+1); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 712 | if (!vj) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | printk(KERN_ERR "PPP: no memory (VJ compressor)\n"); |
| 714 | err = -ENOMEM; |
| 715 | break; |
| 716 | } |
| 717 | ppp_lock(ppp); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 718 | if (ppp->vj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | slhc_free(ppp->vj); |
| 720 | ppp->vj = vj; |
| 721 | ppp_unlock(ppp); |
| 722 | err = 0; |
| 723 | break; |
| 724 | |
| 725 | case PPPIOCGNPMODE: |
| 726 | case PPPIOCSNPMODE: |
| 727 | if (copy_from_user(&npi, argp, sizeof(npi))) |
| 728 | break; |
| 729 | err = proto_to_npindex(npi.protocol); |
| 730 | if (err < 0) |
| 731 | break; |
| 732 | i = err; |
| 733 | if (cmd == PPPIOCGNPMODE) { |
| 734 | err = -EFAULT; |
| 735 | npi.mode = ppp->npmode[i]; |
| 736 | if (copy_to_user(argp, &npi, sizeof(npi))) |
| 737 | break; |
| 738 | } else { |
| 739 | ppp->npmode[i] = npi.mode; |
| 740 | /* we may be able to transmit more packets now (??) */ |
| 741 | netif_wake_queue(ppp->dev); |
| 742 | } |
| 743 | err = 0; |
| 744 | break; |
| 745 | |
| 746 | #ifdef CONFIG_PPP_FILTER |
| 747 | case PPPIOCSPASS: |
| 748 | { |
| 749 | struct sock_filter *code; |
| 750 | err = get_filter(argp, &code); |
| 751 | if (err >= 0) { |
| 752 | ppp_lock(ppp); |
| 753 | kfree(ppp->pass_filter); |
| 754 | ppp->pass_filter = code; |
| 755 | ppp->pass_len = err; |
| 756 | ppp_unlock(ppp); |
| 757 | err = 0; |
| 758 | } |
| 759 | break; |
| 760 | } |
| 761 | case PPPIOCSACTIVE: |
| 762 | { |
| 763 | struct sock_filter *code; |
| 764 | err = get_filter(argp, &code); |
| 765 | if (err >= 0) { |
| 766 | ppp_lock(ppp); |
| 767 | kfree(ppp->active_filter); |
| 768 | ppp->active_filter = code; |
| 769 | ppp->active_len = err; |
| 770 | ppp_unlock(ppp); |
| 771 | err = 0; |
| 772 | } |
| 773 | break; |
| 774 | } |
| 775 | #endif /* CONFIG_PPP_FILTER */ |
| 776 | |
| 777 | #ifdef CONFIG_PPP_MULTILINK |
| 778 | case PPPIOCSMRRU: |
| 779 | if (get_user(val, p)) |
| 780 | break; |
| 781 | ppp_recv_lock(ppp); |
| 782 | ppp->mrru = val; |
| 783 | ppp_recv_unlock(ppp); |
| 784 | err = 0; |
| 785 | break; |
| 786 | #endif /* CONFIG_PPP_MULTILINK */ |
| 787 | |
| 788 | default: |
| 789 | err = -ENOTTY; |
| 790 | } |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 791 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return err; |
| 793 | } |
| 794 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 795 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
| 796 | struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
| 798 | int unit, err = -EFAULT; |
| 799 | struct ppp *ppp; |
| 800 | struct channel *chan; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 801 | struct ppp_net *pn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | int __user *p = (int __user *)arg; |
| 803 | |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 804 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | switch (cmd) { |
| 806 | case PPPIOCNEWUNIT: |
| 807 | /* Create a new ppp unit */ |
| 808 | if (get_user(unit, p)) |
| 809 | break; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 810 | ppp = ppp_create_interface(net, unit, &err); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 811 | if (!ppp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | break; |
| 813 | file->private_data = &ppp->file; |
| 814 | ppp->owner = file; |
| 815 | err = -EFAULT; |
| 816 | if (put_user(ppp->file.index, p)) |
| 817 | break; |
| 818 | err = 0; |
| 819 | break; |
| 820 | |
| 821 | case PPPIOCATTACH: |
| 822 | /* Attach to an existing ppp unit */ |
| 823 | if (get_user(unit, p)) |
| 824 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | err = -ENXIO; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 826 | pn = ppp_pernet(net); |
| 827 | mutex_lock(&pn->all_ppp_mutex); |
| 828 | ppp = ppp_find_unit(pn, unit); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 829 | if (ppp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | atomic_inc(&ppp->file.refcnt); |
| 831 | file->private_data = &ppp->file; |
| 832 | err = 0; |
| 833 | } |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 834 | mutex_unlock(&pn->all_ppp_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | break; |
| 836 | |
| 837 | case PPPIOCATTCHAN: |
| 838 | if (get_user(unit, p)) |
| 839 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | err = -ENXIO; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 841 | pn = ppp_pernet(net); |
| 842 | spin_lock_bh(&pn->all_channels_lock); |
| 843 | chan = ppp_find_channel(pn, unit); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 844 | if (chan) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | atomic_inc(&chan->file.refcnt); |
| 846 | file->private_data = &chan->file; |
| 847 | err = 0; |
| 848 | } |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 849 | spin_unlock_bh(&pn->all_channels_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | break; |
| 851 | |
| 852 | default: |
| 853 | err = -ENOTTY; |
| 854 | } |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 855 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | return err; |
| 857 | } |
| 858 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 859 | static const struct file_operations ppp_device_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | .owner = THIS_MODULE, |
| 861 | .read = ppp_read, |
| 862 | .write = ppp_write, |
| 863 | .poll = ppp_poll, |
Alan Cox | f3ff8a4 | 2008-05-25 23:40:58 -0700 | [diff] [blame] | 864 | .unlocked_ioctl = ppp_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | .open = ppp_open, |
| 866 | .release = ppp_release |
| 867 | }; |
| 868 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 869 | static __net_init int ppp_init_net(struct net *net) |
| 870 | { |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 871 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 872 | |
| 873 | idr_init(&pn->units_idr); |
| 874 | mutex_init(&pn->all_ppp_mutex); |
| 875 | |
| 876 | INIT_LIST_HEAD(&pn->all_channels); |
| 877 | INIT_LIST_HEAD(&pn->new_channels); |
| 878 | |
| 879 | spin_lock_init(&pn->all_channels_lock); |
| 880 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 881 | return 0; |
| 882 | } |
| 883 | |
| 884 | static __net_exit void ppp_exit_net(struct net *net) |
| 885 | { |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 886 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 887 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 888 | idr_destroy(&pn->units_idr); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 889 | } |
| 890 | |
Alexey Dobriyan | 0012985 | 2009-02-09 18:05:16 -0800 | [diff] [blame] | 891 | static struct pernet_operations ppp_net_ops = { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 892 | .init = ppp_init_net, |
| 893 | .exit = ppp_exit_net, |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 894 | .id = &ppp_net_id, |
| 895 | .size = sizeof(struct ppp_net), |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 896 | }; |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | #define PPP_MAJOR 108 |
| 899 | |
| 900 | /* Called at boot time if ppp is compiled into the kernel, |
| 901 | or at module load time (from init_module) if compiled as a module. */ |
| 902 | static int __init ppp_init(void) |
| 903 | { |
| 904 | int err; |
| 905 | |
| 906 | printk(KERN_INFO "PPP generic driver version " PPP_VERSION "\n"); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 907 | |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 908 | err = register_pernet_device(&ppp_net_ops); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 909 | if (err) { |
| 910 | printk(KERN_ERR "failed to register PPP pernet device (%d)\n", err); |
| 911 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | } |
| 913 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 914 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
| 915 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | printk(KERN_ERR "failed to register PPP device (%d)\n", err); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 917 | goto out_net; |
| 918 | } |
| 919 | |
| 920 | ppp_class = class_create(THIS_MODULE, "ppp"); |
| 921 | if (IS_ERR(ppp_class)) { |
| 922 | err = PTR_ERR(ppp_class); |
| 923 | goto out_chrdev; |
| 924 | } |
| 925 | |
| 926 | /* not a big deal if we fail here :-) */ |
| 927 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); |
| 928 | |
| 929 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | out_chrdev: |
| 932 | unregister_chrdev(PPP_MAJOR, "ppp"); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 933 | out_net: |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 934 | unregister_pernet_device(&ppp_net_ops); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 935 | out: |
| 936 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | /* |
| 940 | * Network interface unit routines. |
| 941 | */ |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 942 | static netdev_tx_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 944 | { |
Wang Chen | c8019bf | 2008-11-20 04:24:17 -0800 | [diff] [blame] | 945 | struct ppp *ppp = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | int npi, proto; |
| 947 | unsigned char *pp; |
| 948 | |
| 949 | npi = ethertype_to_npindex(ntohs(skb->protocol)); |
| 950 | if (npi < 0) |
| 951 | goto outf; |
| 952 | |
| 953 | /* Drop, accept or reject the packet */ |
| 954 | switch (ppp->npmode[npi]) { |
| 955 | case NPMODE_PASS: |
| 956 | break; |
| 957 | case NPMODE_QUEUE: |
| 958 | /* it would be nice to have a way to tell the network |
| 959 | system to queue this one up for later. */ |
| 960 | goto outf; |
| 961 | case NPMODE_DROP: |
| 962 | case NPMODE_ERROR: |
| 963 | goto outf; |
| 964 | } |
| 965 | |
| 966 | /* Put the 2-byte PPP protocol number on the front, |
| 967 | making sure there is room for the address and control fields. */ |
Herbert Xu | 7b797d5 | 2007-09-16 16:21:42 -0700 | [diff] [blame] | 968 | if (skb_cow_head(skb, PPP_HDRLEN)) |
| 969 | goto outf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | pp = skb_push(skb, 2); |
| 972 | proto = npindex_to_proto[npi]; |
| 973 | pp[0] = proto >> 8; |
| 974 | pp[1] = proto; |
| 975 | |
| 976 | netif_stop_queue(dev); |
| 977 | skb_queue_tail(&ppp->file.xq, skb); |
| 978 | ppp_xmit_process(ppp); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 979 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
| 981 | outf: |
| 982 | kfree_skb(skb); |
Paulius Zaleckas | 6ceffd4 | 2009-02-23 04:59:43 +0000 | [diff] [blame] | 983 | ++dev->stats.tx_dropped; |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 984 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
| 986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | static int |
| 988 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 989 | { |
Wang Chen | c8019bf | 2008-11-20 04:24:17 -0800 | [diff] [blame] | 990 | struct ppp *ppp = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | int err = -EFAULT; |
| 992 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; |
| 993 | struct ppp_stats stats; |
| 994 | struct ppp_comp_stats cstats; |
| 995 | char *vers; |
| 996 | |
| 997 | switch (cmd) { |
| 998 | case SIOCGPPPSTATS: |
| 999 | ppp_get_stats(ppp, &stats); |
| 1000 | if (copy_to_user(addr, &stats, sizeof(stats))) |
| 1001 | break; |
| 1002 | err = 0; |
| 1003 | break; |
| 1004 | |
| 1005 | case SIOCGPPPCSTATS: |
| 1006 | memset(&cstats, 0, sizeof(cstats)); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1007 | if (ppp->xc_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1009 | if (ppp->rc_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
| 1011 | if (copy_to_user(addr, &cstats, sizeof(cstats))) |
| 1012 | break; |
| 1013 | err = 0; |
| 1014 | break; |
| 1015 | |
| 1016 | case SIOCGPPPVER: |
| 1017 | vers = PPP_VERSION; |
| 1018 | if (copy_to_user(addr, vers, strlen(vers) + 1)) |
| 1019 | break; |
| 1020 | err = 0; |
| 1021 | break; |
| 1022 | |
| 1023 | default: |
| 1024 | err = -EINVAL; |
| 1025 | } |
| 1026 | |
| 1027 | return err; |
| 1028 | } |
| 1029 | |
Stephen Hemminger | 52256cf | 2008-11-19 22:22:30 -0800 | [diff] [blame] | 1030 | static const struct net_device_ops ppp_netdev_ops = { |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1031 | .ndo_start_xmit = ppp_start_xmit, |
| 1032 | .ndo_do_ioctl = ppp_net_ioctl, |
Stephen Hemminger | 52256cf | 2008-11-19 22:22:30 -0800 | [diff] [blame] | 1033 | }; |
| 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | static void ppp_setup(struct net_device *dev) |
| 1036 | { |
Stephen Hemminger | 52256cf | 2008-11-19 22:22:30 -0800 | [diff] [blame] | 1037 | dev->netdev_ops = &ppp_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | dev->hard_header_len = PPP_HDRLEN; |
| 1039 | dev->mtu = PPP_MTU; |
| 1040 | dev->addr_len = 0; |
| 1041 | dev->tx_queue_len = 3; |
| 1042 | dev->type = ARPHRD_PPP; |
| 1043 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 1044 | dev->features |= NETIF_F_NETNS_LOCAL; |
Eric Dumazet | 8b2d850 | 2009-05-19 14:24:37 -0700 | [diff] [blame] | 1045 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
| 1048 | /* |
| 1049 | * Transmit-side routines. |
| 1050 | */ |
| 1051 | |
| 1052 | /* |
| 1053 | * Called to do any work queued up on the transmit side |
| 1054 | * that can now be done. |
| 1055 | */ |
| 1056 | static void |
| 1057 | ppp_xmit_process(struct ppp *ppp) |
| 1058 | { |
| 1059 | struct sk_buff *skb; |
| 1060 | |
| 1061 | ppp_xmit_lock(ppp); |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 1062 | if (!ppp->closing) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | ppp_push(ppp); |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1064 | while (!ppp->xmit_pending && |
| 1065 | (skb = skb_dequeue(&ppp->file.xq))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | ppp_send_frame(ppp, skb); |
| 1067 | /* If there's no work left to do, tell the core net |
| 1068 | code that we can accept some more. */ |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1069 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | netif_wake_queue(ppp->dev); |
| 1071 | } |
| 1072 | ppp_xmit_unlock(ppp); |
| 1073 | } |
| 1074 | |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 1075 | static inline struct sk_buff * |
| 1076 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) |
| 1077 | { |
| 1078 | struct sk_buff *new_skb; |
| 1079 | int len; |
| 1080 | int new_skb_size = ppp->dev->mtu + |
| 1081 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; |
| 1082 | int compressor_skb_size = ppp->dev->mtu + |
| 1083 | ppp->xcomp->comp_extra + PPP_HDRLEN; |
| 1084 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); |
| 1085 | if (!new_skb) { |
| 1086 | if (net_ratelimit()) |
| 1087 | printk(KERN_ERR "PPP: no memory (comp pkt)\n"); |
| 1088 | return NULL; |
| 1089 | } |
| 1090 | if (ppp->dev->hard_header_len > PPP_HDRLEN) |
| 1091 | skb_reserve(new_skb, |
| 1092 | ppp->dev->hard_header_len - PPP_HDRLEN); |
| 1093 | |
| 1094 | /* compressor still expects A/C bytes in hdr */ |
| 1095 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, |
| 1096 | new_skb->data, skb->len + 2, |
| 1097 | compressor_skb_size); |
| 1098 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { |
| 1099 | kfree_skb(skb); |
| 1100 | skb = new_skb; |
| 1101 | skb_put(skb, len); |
| 1102 | skb_pull(skb, 2); /* pull off A/C bytes */ |
| 1103 | } else if (len == 0) { |
| 1104 | /* didn't compress, or CCP not up yet */ |
| 1105 | kfree_skb(new_skb); |
| 1106 | new_skb = skb; |
| 1107 | } else { |
| 1108 | /* |
| 1109 | * (len < 0) |
| 1110 | * MPPE requires that we do not send unencrypted |
| 1111 | * frames. The compressor will return -1 if we |
| 1112 | * should drop the frame. We cannot simply test |
| 1113 | * the compress_proto because MPPE and MPPC share |
| 1114 | * the same number. |
| 1115 | */ |
| 1116 | if (net_ratelimit()) |
| 1117 | printk(KERN_ERR "ppp: compressor dropped pkt\n"); |
| 1118 | kfree_skb(skb); |
| 1119 | kfree_skb(new_skb); |
| 1120 | new_skb = NULL; |
| 1121 | } |
| 1122 | return new_skb; |
| 1123 | } |
| 1124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | /* |
| 1126 | * Compress and send a frame. |
| 1127 | * The caller should have locked the xmit path, |
| 1128 | * and xmit_pending should be 0. |
| 1129 | */ |
| 1130 | static void |
| 1131 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) |
| 1132 | { |
| 1133 | int proto = PPP_PROTO(skb); |
| 1134 | struct sk_buff *new_skb; |
| 1135 | int len; |
| 1136 | unsigned char *cp; |
| 1137 | |
| 1138 | if (proto < 0x8000) { |
| 1139 | #ifdef CONFIG_PPP_FILTER |
| 1140 | /* check if we should pass this packet */ |
| 1141 | /* the filter instructions are constructed assuming |
| 1142 | a four-byte PPP header on each packet */ |
| 1143 | *skb_push(skb, 2) = 1; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1144 | if (ppp->pass_filter && |
| 1145 | sk_run_filter(skb, ppp->pass_filter, |
| 1146 | ppp->pass_len) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | if (ppp->debug & 1) |
| 1148 | printk(KERN_DEBUG "PPP: outbound frame not passed\n"); |
| 1149 | kfree_skb(skb); |
| 1150 | return; |
| 1151 | } |
| 1152 | /* if this packet passes the active filter, record the time */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1153 | if (!(ppp->active_filter && |
| 1154 | sk_run_filter(skb, ppp->active_filter, |
| 1155 | ppp->active_len) == 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | ppp->last_xmit = jiffies; |
| 1157 | skb_pull(skb, 2); |
| 1158 | #else |
| 1159 | /* for data packets, record the time */ |
| 1160 | ppp->last_xmit = jiffies; |
| 1161 | #endif /* CONFIG_PPP_FILTER */ |
| 1162 | } |
| 1163 | |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1164 | ++ppp->dev->stats.tx_packets; |
| 1165 | ppp->dev->stats.tx_bytes += skb->len - 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | switch (proto) { |
| 1168 | case PPP_IP: |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1169 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | break; |
| 1171 | /* try to do VJ TCP header compression */ |
| 1172 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, |
| 1173 | GFP_ATOMIC); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1174 | if (!new_skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | printk(KERN_ERR "PPP: no memory (VJ comp pkt)\n"); |
| 1176 | goto drop; |
| 1177 | } |
| 1178 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); |
| 1179 | cp = skb->data + 2; |
| 1180 | len = slhc_compress(ppp->vj, cp, skb->len - 2, |
| 1181 | new_skb->data + 2, &cp, |
| 1182 | !(ppp->flags & SC_NO_TCP_CCID)); |
| 1183 | if (cp == skb->data + 2) { |
| 1184 | /* didn't compress */ |
| 1185 | kfree_skb(new_skb); |
| 1186 | } else { |
| 1187 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { |
| 1188 | proto = PPP_VJC_COMP; |
| 1189 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; |
| 1190 | } else { |
| 1191 | proto = PPP_VJC_UNCOMP; |
| 1192 | cp[0] = skb->data[2]; |
| 1193 | } |
| 1194 | kfree_skb(skb); |
| 1195 | skb = new_skb; |
| 1196 | cp = skb_put(skb, len + 2); |
| 1197 | cp[0] = 0; |
| 1198 | cp[1] = proto; |
| 1199 | } |
| 1200 | break; |
| 1201 | |
| 1202 | case PPP_CCP: |
| 1203 | /* peek at outbound CCP frames */ |
| 1204 | ppp_ccp_peek(ppp, skb, 0); |
| 1205 | break; |
| 1206 | } |
| 1207 | |
| 1208 | /* try to do packet compression */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1209 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
| 1210 | proto != PPP_LCP && proto != PPP_CCP) { |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 1211 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
| 1212 | if (net_ratelimit()) |
| 1213 | printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | goto drop; |
| 1215 | } |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 1216 | skb = pad_compress_skb(ppp, skb); |
| 1217 | if (!skb) |
| 1218 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | /* |
| 1222 | * If we are waiting for traffic (demand dialling), |
| 1223 | * queue it up for pppd to receive. |
| 1224 | */ |
| 1225 | if (ppp->flags & SC_LOOP_TRAFFIC) { |
| 1226 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) |
| 1227 | goto drop; |
| 1228 | skb_queue_tail(&ppp->file.rq, skb); |
| 1229 | wake_up_interruptible(&ppp->file.rwait); |
| 1230 | return; |
| 1231 | } |
| 1232 | |
| 1233 | ppp->xmit_pending = skb; |
| 1234 | ppp_push(ppp); |
| 1235 | return; |
| 1236 | |
| 1237 | drop: |
Wei Yongjun | 1d2f8c9 | 2009-02-25 00:16:08 +0000 | [diff] [blame] | 1238 | kfree_skb(skb); |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1239 | ++ppp->dev->stats.tx_errors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } |
| 1241 | |
| 1242 | /* |
| 1243 | * Try to send the frame in xmit_pending. |
| 1244 | * The caller should have the xmit path locked. |
| 1245 | */ |
| 1246 | static void |
| 1247 | ppp_push(struct ppp *ppp) |
| 1248 | { |
| 1249 | struct list_head *list; |
| 1250 | struct channel *pch; |
| 1251 | struct sk_buff *skb = ppp->xmit_pending; |
| 1252 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1253 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return; |
| 1255 | |
| 1256 | list = &ppp->channels; |
| 1257 | if (list_empty(list)) { |
| 1258 | /* nowhere to send the packet, just drop it */ |
| 1259 | ppp->xmit_pending = NULL; |
| 1260 | kfree_skb(skb); |
| 1261 | return; |
| 1262 | } |
| 1263 | |
| 1264 | if ((ppp->flags & SC_MULTILINK) == 0) { |
| 1265 | /* not doing multilink: send it down the first channel */ |
| 1266 | list = list->next; |
| 1267 | pch = list_entry(list, struct channel, clist); |
| 1268 | |
| 1269 | spin_lock_bh(&pch->downl); |
| 1270 | if (pch->chan) { |
| 1271 | if (pch->chan->ops->start_xmit(pch->chan, skb)) |
| 1272 | ppp->xmit_pending = NULL; |
| 1273 | } else { |
| 1274 | /* channel got unregistered */ |
| 1275 | kfree_skb(skb); |
| 1276 | ppp->xmit_pending = NULL; |
| 1277 | } |
| 1278 | spin_unlock_bh(&pch->downl); |
| 1279 | return; |
| 1280 | } |
| 1281 | |
| 1282 | #ifdef CONFIG_PPP_MULTILINK |
| 1283 | /* Multilink: fragment the packet over as many links |
| 1284 | as can take the packet at the moment. */ |
| 1285 | if (!ppp_mp_explode(ppp, skb)) |
| 1286 | return; |
| 1287 | #endif /* CONFIG_PPP_MULTILINK */ |
| 1288 | |
| 1289 | ppp->xmit_pending = NULL; |
| 1290 | kfree_skb(skb); |
| 1291 | } |
| 1292 | |
| 1293 | #ifdef CONFIG_PPP_MULTILINK |
| 1294 | /* |
| 1295 | * Divide a packet to be transmitted into fragments and |
| 1296 | * send them out the individual links. |
| 1297 | */ |
| 1298 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) |
| 1299 | { |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1300 | int len, totlen; |
| 1301 | int i, bits, hdrlen, mtu; |
| 1302 | int flen; |
| 1303 | int navail, nfree, nzero; |
| 1304 | int nbigger; |
| 1305 | int totspeed; |
| 1306 | int totfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | unsigned char *p, *q; |
| 1308 | struct list_head *list; |
| 1309 | struct channel *pch; |
| 1310 | struct sk_buff *frag; |
| 1311 | struct ppp_channel *chan; |
| 1312 | |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1313 | totspeed = 0; /*total bitrate of the bundle*/ |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1314 | nfree = 0; /* # channels which have no packet already queued */ |
| 1315 | navail = 0; /* total # of usable channels (not deregistered) */ |
| 1316 | nzero = 0; /* number of channels with zero speed associated*/ |
| 1317 | totfree = 0; /*total # of channels available and |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1318 | *having no queued packets before |
| 1319 | *starting the fragmentation*/ |
| 1320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1322 | i = 0; |
| 1323 | list_for_each_entry(pch, &ppp->channels, clist) { |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1324 | navail += pch->avail = (pch->chan != NULL); |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1325 | pch->speed = pch->chan->speed; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1326 | if (pch->avail) { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1327 | if (skb_queue_empty(&pch->file.xq) || |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1328 | !pch->had_frag) { |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1329 | if (pch->speed == 0) |
| 1330 | nzero++; |
| 1331 | else |
| 1332 | totspeed += pch->speed; |
| 1333 | |
| 1334 | pch->avail = 2; |
| 1335 | ++nfree; |
| 1336 | ++totfree; |
| 1337 | } |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1338 | if (!pch->had_frag && i < ppp->nxchan) |
| 1339 | ppp->nxchan = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | } |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1341 | ++i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | } |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1343 | /* |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1344 | * Don't start sending this packet unless at least half of |
| 1345 | * the channels are free. This gives much better TCP |
| 1346 | * performance if we have a lot of channels. |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1347 | */ |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1348 | if (nfree == 0 || nfree < navail / 2) |
| 1349 | return 0; /* can't take now, leave it in xmit_pending */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
| 1351 | /* Do protocol field compression (XXX this should be optional) */ |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1352 | p = skb->data; |
| 1353 | len = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | if (*p == 0) { |
| 1355 | ++p; |
| 1356 | --len; |
| 1357 | } |
| 1358 | |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1359 | totlen = len; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1360 | nbigger = len % nfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1362 | /* skip to the channel after the one we last used |
| 1363 | and start at that one */ |
Domen Puncer | 81616c5 | 2005-09-10 00:27:04 -0700 | [diff] [blame] | 1364 | list = &ppp->channels; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1365 | for (i = 0; i < ppp->nxchan; ++i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | list = list->next; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1367 | if (list == &ppp->channels) { |
| 1368 | i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | break; |
| 1370 | } |
| 1371 | } |
| 1372 | |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1373 | /* create a fragment for each channel */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | bits = B; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1375 | while (len > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | list = list->next; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1377 | if (list == &ppp->channels) { |
| 1378 | i = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | continue; |
| 1380 | } |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1381 | pch = list_entry(list, struct channel, clist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | ++i; |
| 1383 | if (!pch->avail) |
| 1384 | continue; |
| 1385 | |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1386 | /* |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1387 | * Skip this channel if it has a fragment pending already and |
| 1388 | * we haven't given a fragment to all of the free channels. |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1389 | */ |
| 1390 | if (pch->avail == 1) { |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1391 | if (nfree > 0) |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1392 | continue; |
| 1393 | } else { |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1394 | pch->avail = 1; |
| 1395 | } |
| 1396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | /* check the channel's mtu and whether it is still attached. */ |
| 1398 | spin_lock_bh(&pch->downl); |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1399 | if (pch->chan == NULL) { |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1400 | /* can't use this channel, it's being deregistered */ |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1401 | if (pch->speed == 0) |
| 1402 | nzero--; |
| 1403 | else |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1404 | totspeed -= pch->speed; |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | spin_unlock_bh(&pch->downl); |
| 1407 | pch->avail = 0; |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1408 | totlen = len; |
| 1409 | totfree--; |
| 1410 | nfree--; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1411 | if (--navail == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | break; |
| 1413 | continue; |
| 1414 | } |
| 1415 | |
| 1416 | /* |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1417 | *if the channel speed is not set divide |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1418 | *the packet evenly among the free channels; |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1419 | *otherwise divide it according to the speed |
| 1420 | *of the channel we are going to transmit on |
| 1421 | */ |
David S. Miller | 886f9fe | 2009-08-19 13:55:55 -0700 | [diff] [blame] | 1422 | flen = len; |
Ben McKeegan | a53a8b5 | 2009-07-28 07:43:57 +0000 | [diff] [blame] | 1423 | if (nfree > 0) { |
| 1424 | if (pch->speed == 0) { |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1425 | flen = totlen/nfree; |
Ben McKeegan | a53a8b5 | 2009-07-28 07:43:57 +0000 | [diff] [blame] | 1426 | if (nbigger > 0) { |
| 1427 | flen++; |
| 1428 | nbigger--; |
| 1429 | } |
| 1430 | } else { |
| 1431 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / |
| 1432 | ((totspeed*totfree)/pch->speed)) - hdrlen; |
| 1433 | if (nbigger > 0) { |
| 1434 | flen += ((totfree - nzero)*pch->speed)/totspeed; |
| 1435 | nbigger -= ((totfree - nzero)*pch->speed)/ |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1436 | totspeed; |
Ben McKeegan | a53a8b5 | 2009-07-28 07:43:57 +0000 | [diff] [blame] | 1437 | } |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1438 | } |
Ben McKeegan | a53a8b5 | 2009-07-28 07:43:57 +0000 | [diff] [blame] | 1439 | nfree--; |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1440 | } |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1441 | |
| 1442 | /* |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1443 | *check if we are on the last channel or |
| 1444 | *we exceded the lenght of the data to |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1445 | *fragment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | */ |
Ben McKeegan | a53a8b5 | 2009-07-28 07:43:57 +0000 | [diff] [blame] | 1447 | if ((nfree <= 0) || (flen > len)) |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1448 | flen = len; |
| 1449 | /* |
| 1450 | *it is not worth to tx on slow channels: |
| 1451 | *in that case from the resulting flen according to the |
| 1452 | *above formula will be equal or less than zero. |
| 1453 | *Skip the channel in this case |
| 1454 | */ |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1455 | if (flen <= 0) { |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1456 | pch->avail = 2; |
| 1457 | spin_unlock_bh(&pch->downl); |
| 1458 | continue; |
| 1459 | } |
| 1460 | |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1461 | mtu = pch->chan->mtu - hdrlen; |
| 1462 | if (mtu < 4) |
| 1463 | mtu = 4; |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1464 | if (flen > mtu) |
| 1465 | flen = mtu; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1466 | if (flen == len) |
| 1467 | bits |= E; |
| 1468 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1469 | if (!frag) |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1470 | goto noskb; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1471 | q = skb_put(frag, flen + hdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1473 | /* make the MP header */ |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1474 | q[0] = PPP_MP >> 8; |
| 1475 | q[1] = PPP_MP; |
| 1476 | if (ppp->flags & SC_MP_XSHORTSEQ) { |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1477 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1478 | q[3] = ppp->nxseq; |
| 1479 | } else { |
| 1480 | q[2] = bits; |
| 1481 | q[3] = ppp->nxseq >> 16; |
| 1482 | q[4] = ppp->nxseq >> 8; |
| 1483 | q[5] = ppp->nxseq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | } |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1485 | |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1486 | memcpy(q + hdrlen, p, flen); |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1487 | |
| 1488 | /* try to send it down the channel */ |
| 1489 | chan = pch->chan; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1490 | if (!skb_queue_empty(&pch->file.xq) || |
Gabriele Paoloni | 9c70526 | 2009-03-13 16:09:12 -0700 | [diff] [blame] | 1491 | !chan->ops->start_xmit(chan, frag)) |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1492 | skb_queue_tail(&pch->file.xq, frag); |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1493 | pch->had_frag = 1; |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1494 | p += flen; |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1495 | len -= flen; |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1496 | ++ppp->nxseq; |
| 1497 | bits = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | spin_unlock_bh(&pch->downl); |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1499 | } |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1500 | ppp->nxchan = i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
| 1502 | return 1; |
| 1503 | |
| 1504 | noskb: |
| 1505 | spin_unlock_bh(&pch->downl); |
| 1506 | if (ppp->debug & 1) |
Lennart Sorensen | fa44a73 | 2010-01-18 12:59:55 +0000 | [diff] [blame] | 1507 | printk(KERN_ERR "PPP: no memory (fragment)\n"); |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1508 | ++ppp->dev->stats.tx_errors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | ++ppp->nxseq; |
| 1510 | return 1; /* abandon the frame */ |
| 1511 | } |
| 1512 | #endif /* CONFIG_PPP_MULTILINK */ |
| 1513 | |
| 1514 | /* |
| 1515 | * Try to send data out on a channel. |
| 1516 | */ |
| 1517 | static void |
| 1518 | ppp_channel_push(struct channel *pch) |
| 1519 | { |
| 1520 | struct sk_buff *skb; |
| 1521 | struct ppp *ppp; |
| 1522 | |
| 1523 | spin_lock_bh(&pch->downl); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1524 | if (pch->chan) { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1525 | while (!skb_queue_empty(&pch->file.xq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | skb = skb_dequeue(&pch->file.xq); |
| 1527 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { |
| 1528 | /* put the packet back and try again later */ |
| 1529 | skb_queue_head(&pch->file.xq, skb); |
| 1530 | break; |
| 1531 | } |
| 1532 | } |
| 1533 | } else { |
| 1534 | /* channel got deregistered */ |
| 1535 | skb_queue_purge(&pch->file.xq); |
| 1536 | } |
| 1537 | spin_unlock_bh(&pch->downl); |
| 1538 | /* see if there is anything from the attached unit to be sent */ |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1539 | if (skb_queue_empty(&pch->file.xq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | read_lock_bh(&pch->upl); |
| 1541 | ppp = pch->ppp; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1542 | if (ppp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | ppp_xmit_process(ppp); |
| 1544 | read_unlock_bh(&pch->upl); |
| 1545 | } |
| 1546 | } |
| 1547 | |
| 1548 | /* |
| 1549 | * Receive-side routines. |
| 1550 | */ |
| 1551 | |
| 1552 | /* misuse a few fields of the skb for MP reconstruction */ |
| 1553 | #define sequence priority |
| 1554 | #define BEbits cb[0] |
| 1555 | |
| 1556 | static inline void |
| 1557 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) |
| 1558 | { |
| 1559 | ppp_recv_lock(ppp); |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 1560 | if (!ppp->closing) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | ppp_receive_frame(ppp, skb, pch); |
| 1562 | else |
| 1563 | kfree_skb(skb); |
| 1564 | ppp_recv_unlock(ppp); |
| 1565 | } |
| 1566 | |
| 1567 | void |
| 1568 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) |
| 1569 | { |
| 1570 | struct channel *pch = chan->ppp; |
| 1571 | int proto; |
| 1572 | |
Simon Arlott | ea8420e | 2010-05-03 10:19:33 +0000 | [diff] [blame] | 1573 | if (!pch) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | kfree_skb(skb); |
| 1575 | return; |
| 1576 | } |
Paul Mackerras | 516cd15 | 2005-05-12 19:47:12 -0400 | [diff] [blame] | 1577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | read_lock_bh(&pch->upl); |
Simon Arlott | ea8420e | 2010-05-03 10:19:33 +0000 | [diff] [blame] | 1579 | if (!pskb_may_pull(skb, 2)) { |
| 1580 | kfree_skb(skb); |
| 1581 | if (pch->ppp) { |
| 1582 | ++pch->ppp->dev->stats.rx_length_errors; |
| 1583 | ppp_receive_error(pch->ppp); |
| 1584 | } |
| 1585 | goto done; |
| 1586 | } |
| 1587 | |
| 1588 | proto = PPP_PROTO(skb); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1589 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | /* put it on the channel queue */ |
| 1591 | skb_queue_tail(&pch->file.rq, skb); |
| 1592 | /* drop old frames if queue too long */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1593 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
| 1594 | (skb = skb_dequeue(&pch->file.rq))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | kfree_skb(skb); |
| 1596 | wake_up_interruptible(&pch->file.rwait); |
| 1597 | } else { |
| 1598 | ppp_do_recv(pch->ppp, skb, pch); |
| 1599 | } |
Simon Arlott | ea8420e | 2010-05-03 10:19:33 +0000 | [diff] [blame] | 1600 | |
| 1601 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | read_unlock_bh(&pch->upl); |
| 1603 | } |
| 1604 | |
| 1605 | /* Put a 0-length skb in the receive queue as an error indication */ |
| 1606 | void |
| 1607 | ppp_input_error(struct ppp_channel *chan, int code) |
| 1608 | { |
| 1609 | struct channel *pch = chan->ppp; |
| 1610 | struct sk_buff *skb; |
| 1611 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1612 | if (!pch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | return; |
| 1614 | |
| 1615 | read_lock_bh(&pch->upl); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1616 | if (pch->ppp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | skb = alloc_skb(0, GFP_ATOMIC); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1618 | if (skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | skb->len = 0; /* probably unnecessary */ |
| 1620 | skb->cb[0] = code; |
| 1621 | ppp_do_recv(pch->ppp, skb, pch); |
| 1622 | } |
| 1623 | } |
| 1624 | read_unlock_bh(&pch->upl); |
| 1625 | } |
| 1626 | |
| 1627 | /* |
| 1628 | * We come in here to process a received frame. |
| 1629 | * The receive side of the ppp unit is locked. |
| 1630 | */ |
| 1631 | static void |
| 1632 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) |
| 1633 | { |
Simon Arlott | ea8420e | 2010-05-03 10:19:33 +0000 | [diff] [blame] | 1634 | /* note: a 0-length skb is used as an error indication */ |
| 1635 | if (skb->len > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | #ifdef CONFIG_PPP_MULTILINK |
| 1637 | /* XXX do channel-level decompression here */ |
| 1638 | if (PPP_PROTO(skb) == PPP_MP) |
| 1639 | ppp_receive_mp_frame(ppp, skb, pch); |
| 1640 | else |
| 1641 | #endif /* CONFIG_PPP_MULTILINK */ |
| 1642 | ppp_receive_nonmp_frame(ppp, skb); |
Simon Arlott | ea8420e | 2010-05-03 10:19:33 +0000 | [diff] [blame] | 1643 | } else { |
| 1644 | kfree_skb(skb); |
| 1645 | ppp_receive_error(ppp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | } |
| 1648 | |
| 1649 | static void |
| 1650 | ppp_receive_error(struct ppp *ppp) |
| 1651 | { |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1652 | ++ppp->dev->stats.rx_errors; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1653 | if (ppp->vj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | slhc_toss(ppp->vj); |
| 1655 | } |
| 1656 | |
| 1657 | static void |
| 1658 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) |
| 1659 | { |
| 1660 | struct sk_buff *ns; |
| 1661 | int proto, len, npi; |
| 1662 | |
| 1663 | /* |
| 1664 | * Decompress the frame, if compressed. |
| 1665 | * Note that some decompressors need to see uncompressed frames |
| 1666 | * that come in as well as compressed frames. |
| 1667 | */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1668 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
| 1669 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | skb = ppp_decompress_frame(ppp, skb); |
| 1671 | |
Matt Domsch | b3f9b92 | 2005-11-08 09:40:47 -0800 | [diff] [blame] | 1672 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
| 1673 | goto err; |
| 1674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | proto = PPP_PROTO(skb); |
| 1676 | switch (proto) { |
| 1677 | case PPP_VJC_COMP: |
| 1678 | /* decompress VJ compressed packets */ |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1679 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | goto err; |
| 1681 | |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1682 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | /* copy to a new sk_buff with more tailroom */ |
| 1684 | ns = dev_alloc_skb(skb->len + 128); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1685 | if (!ns) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | printk(KERN_ERR"PPP: no memory (VJ decomp)\n"); |
| 1687 | goto err; |
| 1688 | } |
| 1689 | skb_reserve(ns, 2); |
| 1690 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); |
| 1691 | kfree_skb(skb); |
| 1692 | skb = ns; |
| 1693 | } |
Herbert Xu | e3f749c | 2006-02-05 20:23:33 -0800 | [diff] [blame] | 1694 | else |
| 1695 | skb->ip_summed = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | |
| 1697 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); |
| 1698 | if (len <= 0) { |
| 1699 | printk(KERN_DEBUG "PPP: VJ decompression error\n"); |
| 1700 | goto err; |
| 1701 | } |
| 1702 | len += 2; |
| 1703 | if (len > skb->len) |
| 1704 | skb_put(skb, len - skb->len); |
| 1705 | else if (len < skb->len) |
| 1706 | skb_trim(skb, len); |
| 1707 | proto = PPP_IP; |
| 1708 | break; |
| 1709 | |
| 1710 | case PPP_VJC_UNCOMP: |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1711 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | goto err; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | /* Until we fix the decompressor need to make sure |
| 1715 | * data portion is linear. |
| 1716 | */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1717 | if (!pskb_may_pull(skb, skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | goto err; |
| 1719 | |
| 1720 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { |
| 1721 | printk(KERN_ERR "PPP: VJ uncompressed error\n"); |
| 1722 | goto err; |
| 1723 | } |
| 1724 | proto = PPP_IP; |
| 1725 | break; |
| 1726 | |
| 1727 | case PPP_CCP: |
| 1728 | ppp_ccp_peek(ppp, skb, 1); |
| 1729 | break; |
| 1730 | } |
| 1731 | |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1732 | ++ppp->dev->stats.rx_packets; |
| 1733 | ppp->dev->stats.rx_bytes += skb->len - 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | |
| 1735 | npi = proto_to_npindex(proto); |
| 1736 | if (npi < 0) { |
| 1737 | /* control or unknown frame - pass it to pppd */ |
| 1738 | skb_queue_tail(&ppp->file.rq, skb); |
| 1739 | /* limit queue length by dropping old frames */ |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1740 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
| 1741 | (skb = skb_dequeue(&ppp->file.rq))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | kfree_skb(skb); |
| 1743 | /* wake up any process polling or blocking on read */ |
| 1744 | wake_up_interruptible(&ppp->file.rwait); |
| 1745 | |
| 1746 | } else { |
| 1747 | /* network protocol frame - give it to the kernel */ |
| 1748 | |
| 1749 | #ifdef CONFIG_PPP_FILTER |
| 1750 | /* check if the packet passes the pass and active filters */ |
| 1751 | /* the filter instructions are constructed assuming |
| 1752 | a four-byte PPP header on each packet */ |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1753 | if (ppp->pass_filter || ppp->active_filter) { |
| 1754 | if (skb_cloned(skb) && |
| 1755 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
| 1756 | goto err; |
| 1757 | |
| 1758 | *skb_push(skb, 2) = 0; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1759 | if (ppp->pass_filter && |
| 1760 | sk_run_filter(skb, ppp->pass_filter, |
| 1761 | ppp->pass_len) == 0) { |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1762 | if (ppp->debug & 1) |
| 1763 | printk(KERN_DEBUG "PPP: inbound frame " |
| 1764 | "not passed\n"); |
| 1765 | kfree_skb(skb); |
| 1766 | return; |
| 1767 | } |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1768 | if (!(ppp->active_filter && |
| 1769 | sk_run_filter(skb, ppp->active_filter, |
| 1770 | ppp->active_len) == 0)) |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1771 | ppp->last_recv = jiffies; |
| 1772 | __skb_pull(skb, 2); |
| 1773 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | #endif /* CONFIG_PPP_FILTER */ |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1775 | ppp->last_recv = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 1777 | if ((ppp->dev->flags & IFF_UP) == 0 || |
| 1778 | ppp->npmode[npi] != NPMODE_PASS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | kfree_skb(skb); |
| 1780 | } else { |
Herbert Xu | cbb042f | 2006-03-20 22:43:56 -0800 | [diff] [blame] | 1781 | /* chop off protocol */ |
| 1782 | skb_pull_rcsum(skb, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | skb->dev = ppp->dev; |
| 1784 | skb->protocol = htons(npindex_to_ethertype[npi]); |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1785 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | } |
| 1788 | } |
| 1789 | return; |
| 1790 | |
| 1791 | err: |
| 1792 | kfree_skb(skb); |
| 1793 | ppp_receive_error(ppp); |
| 1794 | } |
| 1795 | |
| 1796 | static struct sk_buff * |
| 1797 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) |
| 1798 | { |
| 1799 | int proto = PPP_PROTO(skb); |
| 1800 | struct sk_buff *ns; |
| 1801 | int len; |
| 1802 | |
| 1803 | /* Until we fix all the decompressor's need to make sure |
| 1804 | * data portion is linear. |
| 1805 | */ |
| 1806 | if (!pskb_may_pull(skb, skb->len)) |
| 1807 | goto err; |
| 1808 | |
| 1809 | if (proto == PPP_COMP) { |
Konstantin Sharlaimov | 4b2a8fb | 2007-06-23 23:05:54 -0700 | [diff] [blame] | 1810 | int obuff_size; |
| 1811 | |
| 1812 | switch(ppp->rcomp->compress_proto) { |
| 1813 | case CI_MPPE: |
| 1814 | obuff_size = ppp->mru + PPP_HDRLEN + 1; |
| 1815 | break; |
| 1816 | default: |
| 1817 | obuff_size = ppp->mru + PPP_HDRLEN; |
| 1818 | break; |
| 1819 | } |
| 1820 | |
| 1821 | ns = dev_alloc_skb(obuff_size); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 1822 | if (!ns) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | printk(KERN_ERR "ppp_decompress_frame: no memory\n"); |
| 1824 | goto err; |
| 1825 | } |
| 1826 | /* the decompressor still expects the A/C bytes in the hdr */ |
| 1827 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, |
Konstantin Sharlaimov | 06c7af5 | 2007-08-21 00:12:44 -0700 | [diff] [blame] | 1828 | skb->len + 2, ns->data, obuff_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | if (len < 0) { |
| 1830 | /* Pass the compressed frame to pppd as an |
| 1831 | error indication. */ |
| 1832 | if (len == DECOMP_FATALERROR) |
| 1833 | ppp->rstate |= SC_DC_FERROR; |
| 1834 | kfree_skb(ns); |
| 1835 | goto err; |
| 1836 | } |
| 1837 | |
| 1838 | kfree_skb(skb); |
| 1839 | skb = ns; |
| 1840 | skb_put(skb, len); |
| 1841 | skb_pull(skb, 2); /* pull off the A/C bytes */ |
| 1842 | |
| 1843 | } else { |
| 1844 | /* Uncompressed frame - pass to decompressor so it |
| 1845 | can update its dictionary if necessary. */ |
| 1846 | if (ppp->rcomp->incomp) |
| 1847 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, |
| 1848 | skb->len + 2); |
| 1849 | } |
| 1850 | |
| 1851 | return skb; |
| 1852 | |
| 1853 | err: |
| 1854 | ppp->rstate |= SC_DC_ERROR; |
| 1855 | ppp_receive_error(ppp); |
| 1856 | return skb; |
| 1857 | } |
| 1858 | |
| 1859 | #ifdef CONFIG_PPP_MULTILINK |
| 1860 | /* |
| 1861 | * Receive a multilink frame. |
| 1862 | * We put it on the reconstruction queue and then pull off |
| 1863 | * as many completed frames as we can. |
| 1864 | */ |
| 1865 | static void |
| 1866 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) |
| 1867 | { |
| 1868 | u32 mask, seq; |
Domen Puncer | 81616c5 | 2005-09-10 00:27:04 -0700 | [diff] [blame] | 1869 | struct channel *ch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
| 1871 | |
Herbert Xu | 2a38b77 | 2007-09-16 16:22:13 -0700 | [diff] [blame] | 1872 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | goto err; /* no good, throw it away */ |
| 1874 | |
| 1875 | /* Decode sequence number and begin/end bits */ |
| 1876 | if (ppp->flags & SC_MP_SHORTSEQ) { |
| 1877 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; |
| 1878 | mask = 0xfff; |
| 1879 | } else { |
| 1880 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; |
| 1881 | mask = 0xffffff; |
| 1882 | } |
| 1883 | skb->BEbits = skb->data[2]; |
| 1884 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ |
| 1885 | |
| 1886 | /* |
| 1887 | * Do protocol ID decompression on the first fragment of each packet. |
| 1888 | */ |
| 1889 | if ((skb->BEbits & B) && (skb->data[0] & 1)) |
| 1890 | *skb_push(skb, 1) = 0; |
| 1891 | |
| 1892 | /* |
| 1893 | * Expand sequence number to 32 bits, making it as close |
| 1894 | * as possible to ppp->minseq. |
| 1895 | */ |
| 1896 | seq |= ppp->minseq & ~mask; |
| 1897 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) |
| 1898 | seq += mask + 1; |
| 1899 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) |
| 1900 | seq -= mask + 1; /* should never happen */ |
| 1901 | skb->sequence = seq; |
| 1902 | pch->lastseq = seq; |
| 1903 | |
| 1904 | /* |
| 1905 | * If this packet comes before the next one we were expecting, |
| 1906 | * drop it. |
| 1907 | */ |
| 1908 | if (seq_before(seq, ppp->nextseq)) { |
| 1909 | kfree_skb(skb); |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 1910 | ++ppp->dev->stats.rx_dropped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | ppp_receive_error(ppp); |
| 1912 | return; |
| 1913 | } |
| 1914 | |
| 1915 | /* |
| 1916 | * Reevaluate minseq, the minimum over all channels of the |
| 1917 | * last sequence number received on each channel. Because of |
| 1918 | * the increasing sequence number rule, we know that any fragment |
| 1919 | * before `minseq' which hasn't arrived is never going to arrive. |
| 1920 | * The list of channels can't change because we have the receive |
| 1921 | * side of the ppp unit locked. |
| 1922 | */ |
Domen Puncer | 81616c5 | 2005-09-10 00:27:04 -0700 | [diff] [blame] | 1923 | list_for_each_entry(ch, &ppp->channels, clist) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | if (seq_before(ch->lastseq, seq)) |
| 1925 | seq = ch->lastseq; |
| 1926 | } |
| 1927 | if (seq_before(ppp->minseq, seq)) |
| 1928 | ppp->minseq = seq; |
| 1929 | |
| 1930 | /* Put the fragment on the reconstruction queue */ |
| 1931 | ppp_mp_insert(ppp, skb); |
| 1932 | |
| 1933 | /* If the queue is getting long, don't wait any longer for packets |
| 1934 | before the start of the queue. */ |
David S. Miller | 38ce7c7 | 2008-09-23 01:17:18 -0700 | [diff] [blame] | 1935 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
| 1936 | struct sk_buff *skb = skb_peek(&ppp->mrq); |
| 1937 | if (seq_before(ppp->minseq, skb->sequence)) |
| 1938 | ppp->minseq = skb->sequence; |
| 1939 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | |
| 1941 | /* Pull completed packets off the queue and receive them. */ |
Ben McKeegan | 82b3cc1 | 2009-11-16 03:44:25 +0000 | [diff] [blame] | 1942 | while ((skb = ppp_mp_reconstruct(ppp))) { |
| 1943 | if (pskb_may_pull(skb, 2)) |
| 1944 | ppp_receive_nonmp_frame(ppp, skb); |
| 1945 | else { |
| 1946 | ++ppp->dev->stats.rx_length_errors; |
| 1947 | kfree_skb(skb); |
| 1948 | ppp_receive_error(ppp); |
| 1949 | } |
| 1950 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | |
| 1952 | return; |
| 1953 | |
| 1954 | err: |
| 1955 | kfree_skb(skb); |
| 1956 | ppp_receive_error(ppp); |
| 1957 | } |
| 1958 | |
| 1959 | /* |
| 1960 | * Insert a fragment on the MP reconstruction queue. |
| 1961 | * The queue is ordered by increasing sequence number. |
| 1962 | */ |
| 1963 | static void |
| 1964 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) |
| 1965 | { |
| 1966 | struct sk_buff *p; |
| 1967 | struct sk_buff_head *list = &ppp->mrq; |
| 1968 | u32 seq = skb->sequence; |
| 1969 | |
| 1970 | /* N.B. we don't need to lock the list lock because we have the |
| 1971 | ppp unit receive-side lock. */ |
David S. Miller | 13c9821 | 2008-10-09 16:40:29 -0700 | [diff] [blame] | 1972 | skb_queue_walk(list, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | if (seq_before(seq, p->sequence)) |
| 1974 | break; |
David S. Miller | 13c9821 | 2008-10-09 16:40:29 -0700 | [diff] [blame] | 1975 | } |
David S. Miller | 43f59c8 | 2008-09-21 21:28:51 -0700 | [diff] [blame] | 1976 | __skb_queue_before(list, p, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * Reconstruct a packet from the MP fragment queue. |
| 1981 | * We go through increasing sequence numbers until we find a |
| 1982 | * complete packet, or we get to the sequence number for a fragment |
| 1983 | * which hasn't arrived but might still do so. |
| 1984 | */ |
Stephen Hemminger | 3c582b3 | 2008-01-23 20:54:07 -0800 | [diff] [blame] | 1985 | static struct sk_buff * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | ppp_mp_reconstruct(struct ppp *ppp) |
| 1987 | { |
| 1988 | u32 seq = ppp->nextseq; |
| 1989 | u32 minseq = ppp->minseq; |
| 1990 | struct sk_buff_head *list = &ppp->mrq; |
| 1991 | struct sk_buff *p, *next; |
| 1992 | struct sk_buff *head, *tail; |
| 1993 | struct sk_buff *skb = NULL; |
| 1994 | int lost = 0, len = 0; |
| 1995 | |
| 1996 | if (ppp->mrru == 0) /* do nothing until mrru is set */ |
| 1997 | return NULL; |
| 1998 | head = list->next; |
| 1999 | tail = NULL; |
| 2000 | for (p = head; p != (struct sk_buff *) list; p = next) { |
| 2001 | next = p->next; |
| 2002 | if (seq_before(p->sequence, seq)) { |
| 2003 | /* this can't happen, anyway ignore the skb */ |
| 2004 | printk(KERN_ERR "ppp_mp_reconstruct bad seq %u < %u\n", |
| 2005 | p->sequence, seq); |
| 2006 | head = next; |
| 2007 | continue; |
| 2008 | } |
| 2009 | if (p->sequence != seq) { |
| 2010 | /* Fragment `seq' is missing. If it is after |
| 2011 | minseq, it might arrive later, so stop here. */ |
| 2012 | if (seq_after(seq, minseq)) |
| 2013 | break; |
| 2014 | /* Fragment `seq' is lost, keep going. */ |
| 2015 | lost = 1; |
| 2016 | seq = seq_before(minseq, p->sequence)? |
| 2017 | minseq + 1: p->sequence; |
| 2018 | next = p; |
| 2019 | continue; |
| 2020 | } |
| 2021 | |
| 2022 | /* |
| 2023 | * At this point we know that all the fragments from |
| 2024 | * ppp->nextseq to seq are either present or lost. |
| 2025 | * Also, there are no complete packets in the queue |
| 2026 | * that have no missing fragments and end before this |
| 2027 | * fragment. |
| 2028 | */ |
| 2029 | |
| 2030 | /* B bit set indicates this fragment starts a packet */ |
| 2031 | if (p->BEbits & B) { |
| 2032 | head = p; |
| 2033 | lost = 0; |
| 2034 | len = 0; |
| 2035 | } |
| 2036 | |
| 2037 | len += p->len; |
| 2038 | |
| 2039 | /* Got a complete packet yet? */ |
| 2040 | if (lost == 0 && (p->BEbits & E) && (head->BEbits & B)) { |
| 2041 | if (len > ppp->mrru + 2) { |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 2042 | ++ppp->dev->stats.rx_length_errors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | printk(KERN_DEBUG "PPP: reconstructed packet" |
| 2044 | " is too long (%d)\n", len); |
| 2045 | } else if (p == head) { |
| 2046 | /* fragment is complete packet - reuse skb */ |
| 2047 | tail = p; |
| 2048 | skb = skb_get(p); |
| 2049 | break; |
| 2050 | } else if ((skb = dev_alloc_skb(len)) == NULL) { |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 2051 | ++ppp->dev->stats.rx_missed_errors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | printk(KERN_DEBUG "PPP: no memory for " |
| 2053 | "reconstructed packet"); |
| 2054 | } else { |
| 2055 | tail = p; |
| 2056 | break; |
| 2057 | } |
| 2058 | ppp->nextseq = seq + 1; |
| 2059 | } |
| 2060 | |
| 2061 | /* |
| 2062 | * If this is the ending fragment of a packet, |
| 2063 | * and we haven't found a complete valid packet yet, |
| 2064 | * we can discard up to and including this fragment. |
| 2065 | */ |
| 2066 | if (p->BEbits & E) |
| 2067 | head = next; |
| 2068 | |
| 2069 | ++seq; |
| 2070 | } |
| 2071 | |
| 2072 | /* If we have a complete packet, copy it all into one skb. */ |
| 2073 | if (tail != NULL) { |
| 2074 | /* If we have discarded any fragments, |
| 2075 | signal a receive error. */ |
| 2076 | if (head->sequence != ppp->nextseq) { |
| 2077 | if (ppp->debug & 1) |
| 2078 | printk(KERN_DEBUG " missed pkts %u..%u\n", |
| 2079 | ppp->nextseq, head->sequence-1); |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 2080 | ++ppp->dev->stats.rx_dropped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | ppp_receive_error(ppp); |
| 2082 | } |
| 2083 | |
| 2084 | if (head != tail) |
| 2085 | /* copy to a single skb */ |
| 2086 | for (p = head; p != tail->next; p = p->next) |
| 2087 | skb_copy_bits(p, 0, skb_put(skb, p->len), p->len); |
| 2088 | ppp->nextseq = tail->sequence + 1; |
| 2089 | head = tail->next; |
| 2090 | } |
| 2091 | |
| 2092 | /* Discard all the skbuffs that we have copied the data out of |
| 2093 | or that we can't use. */ |
| 2094 | while ((p = list->next) != head) { |
| 2095 | __skb_unlink(p, list); |
| 2096 | kfree_skb(p); |
| 2097 | } |
| 2098 | |
| 2099 | return skb; |
| 2100 | } |
| 2101 | #endif /* CONFIG_PPP_MULTILINK */ |
| 2102 | |
| 2103 | /* |
| 2104 | * Channel interface. |
| 2105 | */ |
| 2106 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2107 | /* Create a new, unattached ppp channel. */ |
| 2108 | int ppp_register_channel(struct ppp_channel *chan) |
| 2109 | { |
| 2110 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); |
| 2111 | } |
| 2112 | |
| 2113 | /* Create a new, unattached ppp channel for specified net. */ |
| 2114 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | { |
| 2116 | struct channel *pch; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2117 | struct ppp_net *pn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | |
Panagiotis Issaris | d4274b5 | 2006-08-15 16:01:07 -0700 | [diff] [blame] | 2119 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2120 | if (!pch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | return -ENOMEM; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2122 | |
| 2123 | pn = ppp_pernet(net); |
| 2124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | pch->ppp = NULL; |
| 2126 | pch->chan = chan; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2127 | pch->chan_net = net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | chan->ppp = pch; |
| 2129 | init_ppp_file(&pch->file, CHANNEL); |
| 2130 | pch->file.hdrlen = chan->hdrlen; |
| 2131 | #ifdef CONFIG_PPP_MULTILINK |
| 2132 | pch->lastseq = -1; |
| 2133 | #endif /* CONFIG_PPP_MULTILINK */ |
| 2134 | init_rwsem(&pch->chan_sem); |
| 2135 | spin_lock_init(&pch->downl); |
| 2136 | rwlock_init(&pch->upl); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2137 | |
| 2138 | spin_lock_bh(&pn->all_channels_lock); |
| 2139 | pch->file.index = ++pn->last_channel_index; |
| 2140 | list_add(&pch->list, &pn->new_channels); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | atomic_inc(&channel_count); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2142 | spin_unlock_bh(&pn->all_channels_lock); |
| 2143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | return 0; |
| 2145 | } |
| 2146 | |
| 2147 | /* |
| 2148 | * Return the index of a channel. |
| 2149 | */ |
| 2150 | int ppp_channel_index(struct ppp_channel *chan) |
| 2151 | { |
| 2152 | struct channel *pch = chan->ppp; |
| 2153 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2154 | if (pch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | return pch->file.index; |
| 2156 | return -1; |
| 2157 | } |
| 2158 | |
| 2159 | /* |
| 2160 | * Return the PPP unit number to which a channel is connected. |
| 2161 | */ |
| 2162 | int ppp_unit_number(struct ppp_channel *chan) |
| 2163 | { |
| 2164 | struct channel *pch = chan->ppp; |
| 2165 | int unit = -1; |
| 2166 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2167 | if (pch) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | read_lock_bh(&pch->upl); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2169 | if (pch->ppp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | unit = pch->ppp->file.index; |
| 2171 | read_unlock_bh(&pch->upl); |
| 2172 | } |
| 2173 | return unit; |
| 2174 | } |
| 2175 | |
| 2176 | /* |
| 2177 | * Disconnect a channel from the generic layer. |
| 2178 | * This must be called in process context. |
| 2179 | */ |
| 2180 | void |
| 2181 | ppp_unregister_channel(struct ppp_channel *chan) |
| 2182 | { |
| 2183 | struct channel *pch = chan->ppp; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2184 | struct ppp_net *pn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2186 | if (!pch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | return; /* should never happen */ |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | chan->ppp = NULL; |
| 2190 | |
| 2191 | /* |
| 2192 | * This ensures that we have returned from any calls into the |
| 2193 | * the channel's start_xmit or ioctl routine before we proceed. |
| 2194 | */ |
| 2195 | down_write(&pch->chan_sem); |
| 2196 | spin_lock_bh(&pch->downl); |
| 2197 | pch->chan = NULL; |
| 2198 | spin_unlock_bh(&pch->downl); |
| 2199 | up_write(&pch->chan_sem); |
| 2200 | ppp_disconnect_channel(pch); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2201 | |
| 2202 | pn = ppp_pernet(pch->chan_net); |
| 2203 | spin_lock_bh(&pn->all_channels_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | list_del(&pch->list); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2205 | spin_unlock_bh(&pn->all_channels_lock); |
| 2206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | pch->file.dead = 1; |
| 2208 | wake_up_interruptible(&pch->file.rwait); |
| 2209 | if (atomic_dec_and_test(&pch->file.refcnt)) |
| 2210 | ppp_destroy_channel(pch); |
| 2211 | } |
| 2212 | |
| 2213 | /* |
| 2214 | * Callback from a channel when it can accept more to transmit. |
| 2215 | * This should be called at BH/softirq level, not interrupt level. |
| 2216 | */ |
| 2217 | void |
| 2218 | ppp_output_wakeup(struct ppp_channel *chan) |
| 2219 | { |
| 2220 | struct channel *pch = chan->ppp; |
| 2221 | |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2222 | if (!pch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | return; |
| 2224 | ppp_channel_push(pch); |
| 2225 | } |
| 2226 | |
| 2227 | /* |
| 2228 | * Compression control. |
| 2229 | */ |
| 2230 | |
| 2231 | /* Process the PPPIOCSCOMPRESS ioctl. */ |
| 2232 | static int |
| 2233 | ppp_set_compress(struct ppp *ppp, unsigned long arg) |
| 2234 | { |
| 2235 | int err; |
| 2236 | struct compressor *cp, *ocomp; |
| 2237 | struct ppp_option_data data; |
| 2238 | void *state, *ostate; |
| 2239 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; |
| 2240 | |
| 2241 | err = -EFAULT; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 2242 | if (copy_from_user(&data, (void __user *) arg, sizeof(data)) || |
| 2243 | (data.length <= CCP_MAX_OPTION_LENGTH && |
| 2244 | copy_from_user(ccp_option, (void __user *) data.ptr, data.length))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | goto out; |
| 2246 | err = -EINVAL; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 2247 | if (data.length > CCP_MAX_OPTION_LENGTH || |
| 2248 | ccp_option[1] < 2 || ccp_option[1] > data.length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | goto out; |
| 2250 | |
Johannes Berg | a65e5d7 | 2008-07-09 10:28:38 +0200 | [diff] [blame] | 2251 | cp = try_then_request_module( |
| 2252 | find_compressor(ccp_option[0]), |
| 2253 | "ppp-compress-%d", ccp_option[0]); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2254 | if (!cp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | goto out; |
| 2256 | |
| 2257 | err = -ENOBUFS; |
| 2258 | if (data.transmit) { |
| 2259 | state = cp->comp_alloc(ccp_option, data.length); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2260 | if (state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | ppp_xmit_lock(ppp); |
| 2262 | ppp->xstate &= ~SC_COMP_RUN; |
| 2263 | ocomp = ppp->xcomp; |
| 2264 | ostate = ppp->xc_state; |
| 2265 | ppp->xcomp = cp; |
| 2266 | ppp->xc_state = state; |
| 2267 | ppp_xmit_unlock(ppp); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2268 | if (ostate) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | ocomp->comp_free(ostate); |
| 2270 | module_put(ocomp->owner); |
| 2271 | } |
| 2272 | err = 0; |
| 2273 | } else |
| 2274 | module_put(cp->owner); |
| 2275 | |
| 2276 | } else { |
| 2277 | state = cp->decomp_alloc(ccp_option, data.length); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2278 | if (state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | ppp_recv_lock(ppp); |
| 2280 | ppp->rstate &= ~SC_DECOMP_RUN; |
| 2281 | ocomp = ppp->rcomp; |
| 2282 | ostate = ppp->rc_state; |
| 2283 | ppp->rcomp = cp; |
| 2284 | ppp->rc_state = state; |
| 2285 | ppp_recv_unlock(ppp); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2286 | if (ostate) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | ocomp->decomp_free(ostate); |
| 2288 | module_put(ocomp->owner); |
| 2289 | } |
| 2290 | err = 0; |
| 2291 | } else |
| 2292 | module_put(cp->owner); |
| 2293 | } |
| 2294 | |
| 2295 | out: |
| 2296 | return err; |
| 2297 | } |
| 2298 | |
| 2299 | /* |
| 2300 | * Look at a CCP packet and update our state accordingly. |
| 2301 | * We assume the caller has the xmit or recv path locked. |
| 2302 | */ |
| 2303 | static void |
| 2304 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) |
| 2305 | { |
| 2306 | unsigned char *dp; |
| 2307 | int len; |
| 2308 | |
| 2309 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) |
| 2310 | return; /* no header */ |
| 2311 | dp = skb->data + 2; |
| 2312 | |
| 2313 | switch (CCP_CODE(dp)) { |
| 2314 | case CCP_CONFREQ: |
| 2315 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2316 | /* A ConfReq starts negotiation of compression |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | * in one direction of transmission, |
| 2318 | * and hence brings it down...but which way? |
| 2319 | * |
| 2320 | * Remember: |
| 2321 | * A ConfReq indicates what the sender would like to receive |
| 2322 | */ |
| 2323 | if(inbound) |
| 2324 | /* He is proposing what I should send */ |
| 2325 | ppp->xstate &= ~SC_COMP_RUN; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2326 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | /* I am proposing to what he should send */ |
| 2328 | ppp->rstate &= ~SC_DECOMP_RUN; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | break; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | case CCP_TERMREQ: |
| 2333 | case CCP_TERMACK: |
| 2334 | /* |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 2335 | * CCP is going down, both directions of transmission |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | */ |
| 2337 | ppp->rstate &= ~SC_DECOMP_RUN; |
| 2338 | ppp->xstate &= ~SC_COMP_RUN; |
| 2339 | break; |
| 2340 | |
| 2341 | case CCP_CONFACK: |
| 2342 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) |
| 2343 | break; |
| 2344 | len = CCP_LENGTH(dp); |
| 2345 | if (!pskb_may_pull(skb, len + 2)) |
| 2346 | return; /* too short */ |
| 2347 | dp += CCP_HDRLEN; |
| 2348 | len -= CCP_HDRLEN; |
| 2349 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) |
| 2350 | break; |
| 2351 | if (inbound) { |
| 2352 | /* we will start receiving compressed packets */ |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2353 | if (!ppp->rc_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | break; |
| 2355 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, |
| 2356 | ppp->file.index, 0, ppp->mru, ppp->debug)) { |
| 2357 | ppp->rstate |= SC_DECOMP_RUN; |
| 2358 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); |
| 2359 | } |
| 2360 | } else { |
| 2361 | /* we will soon start sending compressed packets */ |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2362 | if (!ppp->xc_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | break; |
| 2364 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, |
| 2365 | ppp->file.index, 0, ppp->debug)) |
| 2366 | ppp->xstate |= SC_COMP_RUN; |
| 2367 | } |
| 2368 | break; |
| 2369 | |
| 2370 | case CCP_RESETACK: |
| 2371 | /* reset the [de]compressor */ |
| 2372 | if ((ppp->flags & SC_CCP_UP) == 0) |
| 2373 | break; |
| 2374 | if (inbound) { |
| 2375 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { |
| 2376 | ppp->rcomp->decomp_reset(ppp->rc_state); |
| 2377 | ppp->rstate &= ~SC_DC_ERROR; |
| 2378 | } |
| 2379 | } else { |
| 2380 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) |
| 2381 | ppp->xcomp->comp_reset(ppp->xc_state); |
| 2382 | } |
| 2383 | break; |
| 2384 | } |
| 2385 | } |
| 2386 | |
| 2387 | /* Free up compression resources. */ |
| 2388 | static void |
| 2389 | ppp_ccp_closed(struct ppp *ppp) |
| 2390 | { |
| 2391 | void *xstate, *rstate; |
| 2392 | struct compressor *xcomp, *rcomp; |
| 2393 | |
| 2394 | ppp_lock(ppp); |
| 2395 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); |
| 2396 | ppp->xstate = 0; |
| 2397 | xcomp = ppp->xcomp; |
| 2398 | xstate = ppp->xc_state; |
| 2399 | ppp->xc_state = NULL; |
| 2400 | ppp->rstate = 0; |
| 2401 | rcomp = ppp->rcomp; |
| 2402 | rstate = ppp->rc_state; |
| 2403 | ppp->rc_state = NULL; |
| 2404 | ppp_unlock(ppp); |
| 2405 | |
| 2406 | if (xstate) { |
| 2407 | xcomp->comp_free(xstate); |
| 2408 | module_put(xcomp->owner); |
| 2409 | } |
| 2410 | if (rstate) { |
| 2411 | rcomp->decomp_free(rstate); |
| 2412 | module_put(rcomp->owner); |
| 2413 | } |
| 2414 | } |
| 2415 | |
| 2416 | /* List of compressors. */ |
| 2417 | static LIST_HEAD(compressor_list); |
| 2418 | static DEFINE_SPINLOCK(compressor_list_lock); |
| 2419 | |
| 2420 | struct compressor_entry { |
| 2421 | struct list_head list; |
| 2422 | struct compressor *comp; |
| 2423 | }; |
| 2424 | |
| 2425 | static struct compressor_entry * |
| 2426 | find_comp_entry(int proto) |
| 2427 | { |
| 2428 | struct compressor_entry *ce; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
Domen Puncer | 81616c5 | 2005-09-10 00:27:04 -0700 | [diff] [blame] | 2430 | list_for_each_entry(ce, &compressor_list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | if (ce->comp->compress_proto == proto) |
| 2432 | return ce; |
| 2433 | } |
| 2434 | return NULL; |
| 2435 | } |
| 2436 | |
| 2437 | /* Register a compressor */ |
| 2438 | int |
| 2439 | ppp_register_compressor(struct compressor *cp) |
| 2440 | { |
| 2441 | struct compressor_entry *ce; |
| 2442 | int ret; |
| 2443 | spin_lock(&compressor_list_lock); |
| 2444 | ret = -EEXIST; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2445 | if (find_comp_entry(cp->compress_proto)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | goto out; |
| 2447 | ret = -ENOMEM; |
| 2448 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2449 | if (!ce) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | goto out; |
| 2451 | ret = 0; |
| 2452 | ce->comp = cp; |
| 2453 | list_add(&ce->list, &compressor_list); |
| 2454 | out: |
| 2455 | spin_unlock(&compressor_list_lock); |
| 2456 | return ret; |
| 2457 | } |
| 2458 | |
| 2459 | /* Unregister a compressor */ |
| 2460 | void |
| 2461 | ppp_unregister_compressor(struct compressor *cp) |
| 2462 | { |
| 2463 | struct compressor_entry *ce; |
| 2464 | |
| 2465 | spin_lock(&compressor_list_lock); |
| 2466 | ce = find_comp_entry(cp->compress_proto); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2467 | if (ce && ce->comp == cp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | list_del(&ce->list); |
| 2469 | kfree(ce); |
| 2470 | } |
| 2471 | spin_unlock(&compressor_list_lock); |
| 2472 | } |
| 2473 | |
| 2474 | /* Find a compressor. */ |
| 2475 | static struct compressor * |
| 2476 | find_compressor(int type) |
| 2477 | { |
| 2478 | struct compressor_entry *ce; |
| 2479 | struct compressor *cp = NULL; |
| 2480 | |
| 2481 | spin_lock(&compressor_list_lock); |
| 2482 | ce = find_comp_entry(type); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2483 | if (ce) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | cp = ce->comp; |
| 2485 | if (!try_module_get(cp->owner)) |
| 2486 | cp = NULL; |
| 2487 | } |
| 2488 | spin_unlock(&compressor_list_lock); |
| 2489 | return cp; |
| 2490 | } |
| 2491 | |
| 2492 | /* |
| 2493 | * Miscelleneous stuff. |
| 2494 | */ |
| 2495 | |
| 2496 | static void |
| 2497 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) |
| 2498 | { |
| 2499 | struct slcompress *vj = ppp->vj; |
| 2500 | |
| 2501 | memset(st, 0, sizeof(*st)); |
Paulius Zaleckas | 8c0469c | 2008-04-23 18:54:01 -0700 | [diff] [blame] | 2502 | st->p.ppp_ipackets = ppp->dev->stats.rx_packets; |
| 2503 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; |
| 2504 | st->p.ppp_ibytes = ppp->dev->stats.rx_bytes; |
| 2505 | st->p.ppp_opackets = ppp->dev->stats.tx_packets; |
| 2506 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; |
| 2507 | st->p.ppp_obytes = ppp->dev->stats.tx_bytes; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2508 | if (!vj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | return; |
| 2510 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; |
| 2511 | st->vj.vjs_compressed = vj->sls_o_compressed; |
| 2512 | st->vj.vjs_searches = vj->sls_o_searches; |
| 2513 | st->vj.vjs_misses = vj->sls_o_misses; |
| 2514 | st->vj.vjs_errorin = vj->sls_i_error; |
| 2515 | st->vj.vjs_tossed = vj->sls_i_tossed; |
| 2516 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; |
| 2517 | st->vj.vjs_compressedin = vj->sls_i_compressed; |
| 2518 | } |
| 2519 | |
| 2520 | /* |
| 2521 | * Stuff for handling the lists of ppp units and channels |
| 2522 | * and for initialization. |
| 2523 | */ |
| 2524 | |
| 2525 | /* |
| 2526 | * Create a new ppp interface unit. Fails if it can't allocate memory |
| 2527 | * or if there is already a unit with the requested number. |
| 2528 | * unit == -1 means allocate a new number. |
| 2529 | */ |
| 2530 | static struct ppp * |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2531 | ppp_create_interface(struct net *net, int unit, int *retp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2532 | { |
| 2533 | struct ppp *ppp; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2534 | struct ppp_net *pn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | struct net_device *dev = NULL; |
| 2536 | int ret = -ENOMEM; |
| 2537 | int i; |
| 2538 | |
Wang Chen | c8019bf | 2008-11-20 04:24:17 -0800 | [diff] [blame] | 2539 | dev = alloc_netdev(sizeof(struct ppp), "", ppp_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | if (!dev) |
| 2541 | goto out1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2543 | pn = ppp_pernet(net); |
| 2544 | |
Wang Chen | c8019bf | 2008-11-20 04:24:17 -0800 | [diff] [blame] | 2545 | ppp = netdev_priv(dev); |
| 2546 | ppp->dev = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | ppp->mru = PPP_MRU; |
| 2548 | init_ppp_file(&ppp->file, INTERFACE); |
| 2549 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ |
| 2550 | for (i = 0; i < NUM_NP; ++i) |
| 2551 | ppp->npmode[i] = NPMODE_PASS; |
| 2552 | INIT_LIST_HEAD(&ppp->channels); |
| 2553 | spin_lock_init(&ppp->rlock); |
| 2554 | spin_lock_init(&ppp->wlock); |
| 2555 | #ifdef CONFIG_PPP_MULTILINK |
| 2556 | ppp->minseq = -1; |
| 2557 | skb_queue_head_init(&ppp->mrq); |
| 2558 | #endif /* CONFIG_PPP_MULTILINK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2560 | /* |
| 2561 | * drum roll: don't forget to set |
| 2562 | * the net device is belong to |
| 2563 | */ |
| 2564 | dev_net_set(dev, net); |
| 2565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | ret = -EEXIST; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2567 | mutex_lock(&pn->all_ppp_mutex); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2568 | |
| 2569 | if (unit < 0) { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2570 | unit = unit_get(&pn->units_idr, ppp); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2571 | if (unit < 0) { |
| 2572 | *retp = unit; |
| 2573 | goto out2; |
| 2574 | } |
| 2575 | } else { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2576 | if (unit_find(&pn->units_idr, unit)) |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2577 | goto out2; /* unit already exists */ |
Cyrill Gorcunov | 8599757 | 2009-01-12 22:11:56 -0800 | [diff] [blame] | 2578 | /* |
| 2579 | * if caller need a specified unit number |
| 2580 | * lets try to satisfy him, otherwise -- |
| 2581 | * he should better ask us for new unit number |
| 2582 | * |
| 2583 | * NOTE: yes I know that returning EEXIST it's not |
| 2584 | * fair but at least pppd will ask us to allocate |
| 2585 | * new unit in this case so user is happy :) |
| 2586 | */ |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2587 | unit = unit_set(&pn->units_idr, ppp, unit); |
Cyrill Gorcunov | 8599757 | 2009-01-12 22:11:56 -0800 | [diff] [blame] | 2588 | if (unit < 0) |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2589 | goto out2; |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2590 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | |
| 2592 | /* Initialize the new ppp unit */ |
| 2593 | ppp->file.index = unit; |
| 2594 | sprintf(dev->name, "ppp%d", unit); |
| 2595 | |
| 2596 | ret = register_netdev(dev); |
| 2597 | if (ret != 0) { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2598 | unit_put(&pn->units_idr, unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | printk(KERN_ERR "PPP: couldn't register device %s (%d)\n", |
| 2600 | dev->name, ret); |
| 2601 | goto out2; |
| 2602 | } |
| 2603 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2604 | ppp->ppp_net = net; |
| 2605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | atomic_inc(&ppp_unit_count); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2607 | mutex_unlock(&pn->all_ppp_mutex); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | *retp = 0; |
| 2610 | return ppp; |
| 2611 | |
| 2612 | out2: |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2613 | mutex_unlock(&pn->all_ppp_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2614 | free_netdev(dev); |
| 2615 | out1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | *retp = ret; |
| 2617 | return NULL; |
| 2618 | } |
| 2619 | |
| 2620 | /* |
| 2621 | * Initialize a ppp_file structure. |
| 2622 | */ |
| 2623 | static void |
| 2624 | init_ppp_file(struct ppp_file *pf, int kind) |
| 2625 | { |
| 2626 | pf->kind = kind; |
| 2627 | skb_queue_head_init(&pf->xq); |
| 2628 | skb_queue_head_init(&pf->rq); |
| 2629 | atomic_set(&pf->refcnt, 1); |
| 2630 | init_waitqueue_head(&pf->rwait); |
| 2631 | } |
| 2632 | |
| 2633 | /* |
| 2634 | * Take down a ppp interface unit - called when the owning file |
| 2635 | * (the one that created the unit) is closed or detached. |
| 2636 | */ |
| 2637 | static void ppp_shutdown_interface(struct ppp *ppp) |
| 2638 | { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2639 | struct ppp_net *pn; |
| 2640 | |
| 2641 | pn = ppp_pernet(ppp->ppp_net); |
| 2642 | mutex_lock(&pn->all_ppp_mutex); |
| 2643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | /* This will call dev_close() for us. */ |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 2645 | ppp_lock(ppp); |
| 2646 | if (!ppp->closing) { |
| 2647 | ppp->closing = 1; |
| 2648 | ppp_unlock(ppp); |
| 2649 | unregister_netdev(ppp->dev); |
| 2650 | } else |
| 2651 | ppp_unlock(ppp); |
| 2652 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2653 | unit_put(&pn->units_idr, ppp->file.index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | ppp->file.dead = 1; |
| 2655 | ppp->owner = NULL; |
| 2656 | wake_up_interruptible(&ppp->file.rwait); |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2657 | |
| 2658 | mutex_unlock(&pn->all_ppp_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2659 | } |
| 2660 | |
| 2661 | /* |
| 2662 | * Free the memory used by a ppp unit. This is only called once |
| 2663 | * there are no channels connected to the unit and no file structs |
| 2664 | * that reference the unit. |
| 2665 | */ |
| 2666 | static void ppp_destroy_interface(struct ppp *ppp) |
| 2667 | { |
| 2668 | atomic_dec(&ppp_unit_count); |
| 2669 | |
| 2670 | if (!ppp->file.dead || ppp->n_channels) { |
| 2671 | /* "can't happen" */ |
| 2672 | printk(KERN_ERR "ppp: destroying ppp struct %p but dead=%d " |
| 2673 | "n_channels=%d !\n", ppp, ppp->file.dead, |
| 2674 | ppp->n_channels); |
| 2675 | return; |
| 2676 | } |
| 2677 | |
| 2678 | ppp_ccp_closed(ppp); |
| 2679 | if (ppp->vj) { |
| 2680 | slhc_free(ppp->vj); |
| 2681 | ppp->vj = NULL; |
| 2682 | } |
| 2683 | skb_queue_purge(&ppp->file.xq); |
| 2684 | skb_queue_purge(&ppp->file.rq); |
| 2685 | #ifdef CONFIG_PPP_MULTILINK |
| 2686 | skb_queue_purge(&ppp->mrq); |
| 2687 | #endif /* CONFIG_PPP_MULTILINK */ |
| 2688 | #ifdef CONFIG_PPP_FILTER |
Jesper Juhl | 96edf83 | 2005-05-03 14:38:09 -0700 | [diff] [blame] | 2689 | kfree(ppp->pass_filter); |
| 2690 | ppp->pass_filter = NULL; |
| 2691 | kfree(ppp->active_filter); |
| 2692 | ppp->active_filter = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | #endif /* CONFIG_PPP_FILTER */ |
| 2694 | |
Wei Yongjun | 1d2f8c9 | 2009-02-25 00:16:08 +0000 | [diff] [blame] | 2695 | kfree_skb(ppp->xmit_pending); |
G. Liakhovetski | 165de5b | 2007-03-25 19:04:09 -0700 | [diff] [blame] | 2696 | |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 2697 | free_netdev(ppp->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | } |
| 2699 | |
| 2700 | /* |
| 2701 | * Locate an existing ppp unit. |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 2702 | * The caller should have locked the all_ppp_mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2703 | */ |
| 2704 | static struct ppp * |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2705 | ppp_find_unit(struct ppp_net *pn, int unit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2707 | return unit_find(&pn->units_idr, unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2708 | } |
| 2709 | |
| 2710 | /* |
| 2711 | * Locate an existing ppp channel. |
| 2712 | * The caller should have locked the all_channels_lock. |
| 2713 | * First we look in the new_channels list, then in the |
| 2714 | * all_channels list. If found in the new_channels list, |
| 2715 | * we move it to the all_channels list. This is for speed |
| 2716 | * when we have a lot of channels in use. |
| 2717 | */ |
| 2718 | static struct channel * |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2719 | ppp_find_channel(struct ppp_net *pn, int unit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | { |
| 2721 | struct channel *pch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2722 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2723 | list_for_each_entry(pch, &pn->new_channels, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | if (pch->file.index == unit) { |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2725 | list_move(&pch->list, &pn->all_channels); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | return pch; |
| 2727 | } |
| 2728 | } |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2729 | |
| 2730 | list_for_each_entry(pch, &pn->all_channels, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2731 | if (pch->file.index == unit) |
| 2732 | return pch; |
| 2733 | } |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | return NULL; |
| 2736 | } |
| 2737 | |
| 2738 | /* |
| 2739 | * Connect a PPP channel to a PPP interface unit. |
| 2740 | */ |
| 2741 | static int |
| 2742 | ppp_connect_channel(struct channel *pch, int unit) |
| 2743 | { |
| 2744 | struct ppp *ppp; |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2745 | struct ppp_net *pn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | int ret = -ENXIO; |
| 2747 | int hdrlen; |
| 2748 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2749 | pn = ppp_pernet(pch->chan_net); |
| 2750 | |
| 2751 | mutex_lock(&pn->all_ppp_mutex); |
| 2752 | ppp = ppp_find_unit(pn, unit); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2753 | if (!ppp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | goto out; |
| 2755 | write_lock_bh(&pch->upl); |
| 2756 | ret = -EINVAL; |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2757 | if (pch->ppp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | goto outl; |
| 2759 | |
| 2760 | ppp_lock(ppp); |
| 2761 | if (pch->file.hdrlen > ppp->file.hdrlen) |
| 2762 | ppp->file.hdrlen = pch->file.hdrlen; |
| 2763 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ |
James Chapman | 739840d | 2008-12-17 12:02:16 +0000 | [diff] [blame] | 2764 | if (hdrlen > ppp->dev->hard_header_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | ppp->dev->hard_header_len = hdrlen; |
| 2766 | list_add_tail(&pch->clist, &ppp->channels); |
| 2767 | ++ppp->n_channels; |
| 2768 | pch->ppp = ppp; |
| 2769 | atomic_inc(&ppp->file.refcnt); |
| 2770 | ppp_unlock(ppp); |
| 2771 | ret = 0; |
| 2772 | |
| 2773 | outl: |
| 2774 | write_unlock_bh(&pch->upl); |
| 2775 | out: |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2776 | mutex_unlock(&pn->all_ppp_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2777 | return ret; |
| 2778 | } |
| 2779 | |
| 2780 | /* |
| 2781 | * Disconnect a channel from its ppp unit. |
| 2782 | */ |
| 2783 | static int |
| 2784 | ppp_disconnect_channel(struct channel *pch) |
| 2785 | { |
| 2786 | struct ppp *ppp; |
| 2787 | int err = -EINVAL; |
| 2788 | |
| 2789 | write_lock_bh(&pch->upl); |
| 2790 | ppp = pch->ppp; |
| 2791 | pch->ppp = NULL; |
| 2792 | write_unlock_bh(&pch->upl); |
Joe Perches | cd228d5 | 2007-11-12 18:07:31 -0800 | [diff] [blame] | 2793 | if (ppp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | /* remove it from the ppp unit's list */ |
| 2795 | ppp_lock(ppp); |
| 2796 | list_del(&pch->clist); |
| 2797 | if (--ppp->n_channels == 0) |
| 2798 | wake_up_interruptible(&ppp->file.rwait); |
| 2799 | ppp_unlock(ppp); |
| 2800 | if (atomic_dec_and_test(&ppp->file.refcnt)) |
| 2801 | ppp_destroy_interface(ppp); |
| 2802 | err = 0; |
| 2803 | } |
| 2804 | return err; |
| 2805 | } |
| 2806 | |
| 2807 | /* |
| 2808 | * Free up the resources used by a ppp channel. |
| 2809 | */ |
| 2810 | static void ppp_destroy_channel(struct channel *pch) |
| 2811 | { |
| 2812 | atomic_dec(&channel_count); |
| 2813 | |
| 2814 | if (!pch->file.dead) { |
| 2815 | /* "can't happen" */ |
| 2816 | printk(KERN_ERR "ppp: destroying undead channel %p !\n", |
| 2817 | pch); |
| 2818 | return; |
| 2819 | } |
| 2820 | skb_queue_purge(&pch->file.xq); |
| 2821 | skb_queue_purge(&pch->file.rq); |
| 2822 | kfree(pch); |
| 2823 | } |
| 2824 | |
| 2825 | static void __exit ppp_cleanup(void) |
| 2826 | { |
| 2827 | /* should never happen */ |
| 2828 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) |
| 2829 | printk(KERN_ERR "PPP: removing module but units remain!\n"); |
Akinobu Mita | 68fc4fa | 2007-07-19 01:47:50 -0700 | [diff] [blame] | 2830 | unregister_chrdev(PPP_MAJOR, "ppp"); |
Greg Kroah-Hartman | 9a6a2a5 | 2006-09-12 17:00:10 +0200 | [diff] [blame] | 2831 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
gregkh@suse.de | 56b2293 | 2005-03-23 10:01:41 -0800 | [diff] [blame] | 2832 | class_destroy(ppp_class); |
Eric W. Biederman | 741a6fa | 2009-11-29 15:46:09 +0000 | [diff] [blame] | 2833 | unregister_pernet_device(&ppp_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | } |
| 2835 | |
| 2836 | /* |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2837 | * Units handling. Caller must protect concurrent access |
| 2838 | * by holding all_ppp_mutex |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2839 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2840 | |
Cyrill Gorcunov | 8599757 | 2009-01-12 22:11:56 -0800 | [diff] [blame] | 2841 | /* associate pointer with specified number */ |
| 2842 | static int unit_set(struct idr *p, void *ptr, int n) |
| 2843 | { |
| 2844 | int unit, err; |
| 2845 | |
| 2846 | again: |
| 2847 | if (!idr_pre_get(p, GFP_KERNEL)) { |
| 2848 | printk(KERN_ERR "PPP: No free memory for idr\n"); |
| 2849 | return -ENOMEM; |
| 2850 | } |
| 2851 | |
| 2852 | err = idr_get_new_above(p, ptr, n, &unit); |
| 2853 | if (err == -EAGAIN) |
| 2854 | goto again; |
| 2855 | |
| 2856 | if (unit != n) { |
| 2857 | idr_remove(p, unit); |
| 2858 | return -EINVAL; |
| 2859 | } |
| 2860 | |
| 2861 | return unit; |
| 2862 | } |
| 2863 | |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2864 | /* get new free unit number and associate pointer with it */ |
| 2865 | static int unit_get(struct idr *p, void *ptr) |
| 2866 | { |
| 2867 | int unit, err; |
| 2868 | |
| 2869 | again: |
Cyrill Gorcunov | 8599757 | 2009-01-12 22:11:56 -0800 | [diff] [blame] | 2870 | if (!idr_pre_get(p, GFP_KERNEL)) { |
| 2871 | printk(KERN_ERR "PPP: No free memory for idr\n"); |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2872 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | } |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2874 | |
| 2875 | err = idr_get_new_above(p, ptr, 0, &unit); |
| 2876 | if (err == -EAGAIN) |
| 2877 | goto again; |
| 2878 | |
| 2879 | return unit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | } |
| 2881 | |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2882 | /* put unit number back to a pool */ |
| 2883 | static void unit_put(struct idr *p, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2884 | { |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2885 | idr_remove(p, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | } |
| 2887 | |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2888 | /* get pointer associated with the number */ |
| 2889 | static void *unit_find(struct idr *p, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2890 | { |
Cyrill Gorcunov | 7a95d26 | 2008-12-17 00:34:06 -0800 | [diff] [blame] | 2891 | return idr_find(p, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | } |
| 2893 | |
| 2894 | /* Module/initialization stuff */ |
| 2895 | |
| 2896 | module_init(ppp_init); |
| 2897 | module_exit(ppp_cleanup); |
| 2898 | |
Cyrill Gorcunov | 273ec51 | 2009-01-21 15:55:35 -0800 | [diff] [blame] | 2899 | EXPORT_SYMBOL(ppp_register_net_channel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2900 | EXPORT_SYMBOL(ppp_register_channel); |
| 2901 | EXPORT_SYMBOL(ppp_unregister_channel); |
| 2902 | EXPORT_SYMBOL(ppp_channel_index); |
| 2903 | EXPORT_SYMBOL(ppp_unit_number); |
| 2904 | EXPORT_SYMBOL(ppp_input); |
| 2905 | EXPORT_SYMBOL(ppp_input_error); |
| 2906 | EXPORT_SYMBOL(ppp_output_wakeup); |
| 2907 | EXPORT_SYMBOL(ppp_register_compressor); |
| 2908 | EXPORT_SYMBOL(ppp_unregister_compressor); |
| 2909 | MODULE_LICENSE("GPL"); |
| 2910 | MODULE_ALIAS_CHARDEV_MAJOR(PPP_MAJOR); |
| 2911 | MODULE_ALIAS("/dev/ppp"); |