| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * RAW - implementation of IP "raw" sockets. |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * |
| * Fixes: |
| * Alan Cox : verify_area() fixed up |
| * Alan Cox : ICMP error handling |
| * Alan Cox : EMSGSIZE if you send too big a packet |
| * Alan Cox : Now uses generic datagrams and shared |
| * skbuff library. No more peek crashes, |
| * no more backlogs |
| * Alan Cox : Checks sk->broadcast. |
| * Alan Cox : Uses skb_free_datagram/skb_copy_datagram |
| * Alan Cox : Raw passes ip options too |
| * Alan Cox : Setsocketopt added |
| * Alan Cox : Fixed error return for broadcasts |
| * Alan Cox : Removed wake_up calls |
| * Alan Cox : Use ttl/tos |
| * Alan Cox : Cleaned up old debugging |
| * Alan Cox : Use new kernel side addresses |
| * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. |
| * Alan Cox : BSD style RAW socket demultiplexing. |
| * Alan Cox : Beginnings of mrouted support. |
| * Alan Cox : Added IP_HDRINCL option. |
| * Alan Cox : Skip broadcast check if BSDism set. |
| * David S. Miller : New socket lookup architecture. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/atomic.h> |
| #include <asm/byteorder.h> |
| #include <asm/current.h> |
| #include <linux/uaccess.h> |
| #include <asm/ioctls.h> |
| #include <linux/stddef.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/spinlock.h> |
| #include <linux/sockios.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/mroute.h> |
| #include <linux/netdevice.h> |
| #include <linux/in_route.h> |
| #include <linux/route.h> |
| #include <linux/skbuff.h> |
| #include <linux/igmp.h> |
| #include <net/net_namespace.h> |
| #include <net/dst.h> |
| #include <net/sock.h> |
| #include <linux/ip.h> |
| #include <linux/net.h> |
| #include <net/ip.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/raw.h> |
| #include <net/snmp.h> |
| #include <net/tcp_states.h> |
| #include <net/inet_common.h> |
| #include <net/checksum.h> |
| #include <net/xfrm.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/compat.h> |
| #include <linux/uio.h> |
| |
| struct raw_frag_vec { |
| struct msghdr *msg; |
| union { |
| struct icmphdr icmph; |
| char c[1]; |
| } hdr; |
| int hlen; |
| }; |
| |
| struct raw_hashinfo raw_v4_hashinfo = { |
| .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), |
| }; |
| EXPORT_SYMBOL_GPL(raw_v4_hashinfo); |
| |
| int raw_hash_sk(struct sock *sk) |
| { |
| struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
| struct hlist_head *head; |
| |
| head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; |
| |
| write_lock_bh(&h->lock); |
| sk_add_node(sk, head); |
| sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
| write_unlock_bh(&h->lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(raw_hash_sk); |
| |
| void raw_unhash_sk(struct sock *sk) |
| { |
| struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; |
| |
| write_lock_bh(&h->lock); |
| if (sk_del_node_init(sk)) |
| sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
| write_unlock_bh(&h->lock); |
| } |
| EXPORT_SYMBOL_GPL(raw_unhash_sk); |
| |
| struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, |
| unsigned short num, __be32 raddr, __be32 laddr, |
| int dif, int sdif) |
| { |
| sk_for_each_from(sk) { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (net_eq(sock_net(sk), net) && inet->inet_num == num && |
| !(inet->inet_daddr && inet->inet_daddr != raddr) && |
| !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && |
| raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) |
| goto found; /* gotcha */ |
| } |
| sk = NULL; |
| found: |
| return sk; |
| } |
| EXPORT_SYMBOL_GPL(__raw_v4_lookup); |
| |
| /* |
| * 0 - deliver |
| * 1 - block |
| */ |
| static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) |
| { |
| struct icmphdr _hdr; |
| const struct icmphdr *hdr; |
| |
| hdr = skb_header_pointer(skb, skb_transport_offset(skb), |
| sizeof(_hdr), &_hdr); |
| if (!hdr) |
| return 1; |
| |
| if (hdr->type < 32) { |
| __u32 data = raw_sk(sk)->filter.data; |
| |
| return ((1U << hdr->type) & data) != 0; |
| } |
| |
| /* Do not block unknown ICMP types */ |
| return 0; |
| } |
| |
| /* IP input processing comes here for RAW socket delivery. |
| * Caller owns SKB, so we must make clones. |
| * |
| * RFC 1122: SHOULD pass TOS value up to the transport layer. |
| * -> It does. And not only TOS, but all IP header. |
| */ |
| static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash) |
| { |
| int sdif = inet_sdif(skb); |
| int dif = inet_iif(skb); |
| struct sock *sk; |
| struct hlist_head *head; |
| int delivered = 0; |
| struct net *net; |
| |
| read_lock(&raw_v4_hashinfo.lock); |
| head = &raw_v4_hashinfo.ht[hash]; |
| if (hlist_empty(head)) |
| goto out; |
| |
| net = dev_net(skb->dev); |
| sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, |
| iph->saddr, iph->daddr, dif, sdif); |
| |
| while (sk) { |
| delivered = 1; |
| if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && |
| ip_mc_sf_allow(sk, iph->daddr, iph->saddr, |
| skb->dev->ifindex, sdif)) { |
| struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); |
| |
| /* Not releasing hash table! */ |
| if (clone) |
| raw_rcv(sk, clone); |
| } |
| sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, |
| iph->saddr, iph->daddr, |
| skb->dev->ifindex, sdif); |
| } |
| out: |
| read_unlock(&raw_v4_hashinfo.lock); |
| return delivered; |
| } |
| |
| int raw_local_deliver(struct sk_buff *skb, int protocol) |
| { |
| int hash; |
| struct sock *raw_sk; |
| |
| hash = protocol & (RAW_HTABLE_SIZE - 1); |
| raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); |
| |
| /* If there maybe a raw socket we must check - if not we |
| * don't care less |
| */ |
| if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) |
| raw_sk = NULL; |
| |
| return raw_sk != NULL; |
| |
| } |
| |
| static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| const int type = icmp_hdr(skb)->type; |
| const int code = icmp_hdr(skb)->code; |
| int err = 0; |
| int harderr = 0; |
| |
| if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) |
| ipv4_sk_update_pmtu(skb, sk, info); |
| else if (type == ICMP_REDIRECT) { |
| ipv4_sk_redirect(skb, sk); |
| return; |
| } |
| |
| /* Report error on raw socket, if: |
| 1. User requested ip_recverr. |
| 2. Socket is connected (otherwise the error indication |
| is useless without ip_recverr and error is hard. |
| */ |
| if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) |
| return; |
| |
| switch (type) { |
| default: |
| case ICMP_TIME_EXCEEDED: |
| err = EHOSTUNREACH; |
| break; |
| case ICMP_SOURCE_QUENCH: |
| return; |
| case ICMP_PARAMETERPROB: |
| err = EPROTO; |
| harderr = 1; |
| break; |
| case ICMP_DEST_UNREACH: |
| err = EHOSTUNREACH; |
| if (code > NR_ICMP_UNREACH) |
| break; |
| err = icmp_err_convert[code].errno; |
| harderr = icmp_err_convert[code].fatal; |
| if (code == ICMP_FRAG_NEEDED) { |
| harderr = inet->pmtudisc != IP_PMTUDISC_DONT; |
| err = EMSGSIZE; |
| } |
| } |
| |
| if (inet->recverr) { |
| const struct iphdr *iph = (const struct iphdr *)skb->data; |
| u8 *payload = skb->data + (iph->ihl << 2); |
| |
| if (inet->hdrincl) |
| payload = skb->data; |
| ip_icmp_error(sk, skb, err, 0, info, payload); |
| } |
| |
| if (inet->recverr || harderr) { |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| } |
| } |
| |
| void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) |
| { |
| int hash; |
| struct sock *raw_sk; |
| const struct iphdr *iph; |
| struct net *net; |
| |
| hash = protocol & (RAW_HTABLE_SIZE - 1); |
| |
| read_lock(&raw_v4_hashinfo.lock); |
| raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); |
| if (raw_sk) { |
| int dif = skb->dev->ifindex; |
| int sdif = inet_sdif(skb); |
| |
| iph = (const struct iphdr *)skb->data; |
| net = dev_net(skb->dev); |
| |
| while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, |
| iph->daddr, iph->saddr, |
| dif, sdif)) != NULL) { |
| raw_err(raw_sk, skb, info); |
| raw_sk = sk_next(raw_sk); |
| iph = (const struct iphdr *)skb->data; |
| } |
| } |
| read_unlock(&raw_v4_hashinfo.lock); |
| } |
| |
| static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| { |
| /* Charge it to the socket. */ |
| |
| ipv4_pktinfo_prepare(sk, skb); |
| if (sock_queue_rcv_skb(sk, skb) < 0) { |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| return NET_RX_SUCCESS; |
| } |
| |
| int raw_rcv(struct sock *sk, struct sk_buff *skb) |
| { |
| if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { |
| atomic_inc(&sk->sk_drops); |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| nf_reset(skb); |
| |
| skb_push(skb, skb->data - skb_network_header(skb)); |
| |
| raw_rcv_skb(sk, skb); |
| return 0; |
| } |
| |
| static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, |
| struct msghdr *msg, size_t length, |
| struct rtable **rtp, unsigned int flags, |
| const struct sockcm_cookie *sockc) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct net *net = sock_net(sk); |
| struct iphdr *iph; |
| struct sk_buff *skb; |
| unsigned int iphlen; |
| int err; |
| struct rtable *rt = *rtp; |
| int hlen, tlen; |
| |
| if (length > rt->dst.dev->mtu) { |
| ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, |
| rt->dst.dev->mtu); |
| return -EMSGSIZE; |
| } |
| if (length < sizeof(struct iphdr)) |
| return -EINVAL; |
| |
| if (flags&MSG_PROBE) |
| goto out; |
| |
| hlen = LL_RESERVED_SPACE(rt->dst.dev); |
| tlen = rt->dst.dev->needed_tailroom; |
| skb = sock_alloc_send_skb(sk, |
| length + hlen + tlen + 15, |
| flags & MSG_DONTWAIT, &err); |
| if (!skb) |
| goto error; |
| skb_reserve(skb, hlen); |
| |
| skb->priority = sk->sk_priority; |
| skb->mark = sk->sk_mark; |
| skb->tstamp = sockc->transmit_time; |
| skb_dst_set(skb, &rt->dst); |
| *rtp = NULL; |
| |
| skb_reset_network_header(skb); |
| iph = ip_hdr(skb); |
| skb_put(skb, length); |
| |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| skb_setup_tx_timestamp(skb, sockc->tsflags); |
| |
| if (flags & MSG_CONFIRM) |
| skb_set_dst_pending_confirm(skb, 1); |
| |
| skb->transport_header = skb->network_header; |
| err = -EFAULT; |
| if (memcpy_from_msg(iph, msg, length)) |
| goto error_free; |
| |
| iphlen = iph->ihl * 4; |
| |
| /* |
| * We don't want to modify the ip header, but we do need to |
| * be sure that it won't cause problems later along the network |
| * stack. Specifically we want to make sure that iph->ihl is a |
| * sane value. If ihl points beyond the length of the buffer passed |
| * in, reject the frame as invalid |
| */ |
| err = -EINVAL; |
| if (iphlen > length) |
| goto error_free; |
| |
| if (iphlen >= sizeof(*iph)) { |
| if (!iph->saddr) |
| iph->saddr = fl4->saddr; |
| iph->check = 0; |
| iph->tot_len = htons(length); |
| if (!iph->id) |
| ip_select_ident(net, skb, NULL); |
| |
| iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| skb->transport_header += iphlen; |
| if (iph->protocol == IPPROTO_ICMP && |
| length >= iphlen + sizeof(struct icmphdr)) |
| icmp_out_count(net, ((struct icmphdr *) |
| skb_transport_header(skb))->type); |
| } |
| |
| err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, |
| net, sk, skb, NULL, rt->dst.dev, |
| dst_output); |
| if (err > 0) |
| err = net_xmit_errno(err); |
| if (err) |
| goto error; |
| out: |
| return 0; |
| |
| error_free: |
| kfree_skb(skb); |
| error: |
| IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); |
| if (err == -ENOBUFS && !inet->recverr) |
| err = 0; |
| return err; |
| } |
| |
| static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) |
| { |
| int err; |
| |
| if (fl4->flowi4_proto != IPPROTO_ICMP) |
| return 0; |
| |
| /* We only need the first two bytes. */ |
| rfv->hlen = 2; |
| |
| err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); |
| if (err) |
| return err; |
| |
| fl4->fl4_icmp_type = rfv->hdr.icmph.type; |
| fl4->fl4_icmp_code = rfv->hdr.icmph.code; |
| |
| return 0; |
| } |
| |
| static int raw_getfrag(void *from, char *to, int offset, int len, int odd, |
| struct sk_buff *skb) |
| { |
| struct raw_frag_vec *rfv = from; |
| |
| if (offset < rfv->hlen) { |
| int copy = min(rfv->hlen - offset, len); |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| memcpy(to, rfv->hdr.c + offset, copy); |
| else |
| skb->csum = csum_block_add( |
| skb->csum, |
| csum_partial_copy_nocheck(rfv->hdr.c + offset, |
| to, copy, 0), |
| odd); |
| |
| odd = 0; |
| offset += copy; |
| to += copy; |
| len -= copy; |
| |
| if (!len) |
| return 0; |
| } |
| |
| offset -= rfv->hlen; |
| |
| return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); |
| } |
| |
| static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct net *net = sock_net(sk); |
| struct ipcm_cookie ipc; |
| struct rtable *rt = NULL; |
| struct flowi4 fl4; |
| int free = 0; |
| __be32 daddr; |
| __be32 saddr; |
| u8 tos; |
| int err; |
| struct ip_options_data opt_copy; |
| struct raw_frag_vec rfv; |
| int hdrincl; |
| |
| err = -EMSGSIZE; |
| if (len > 0xFFFF) |
| goto out; |
| |
| /* hdrincl should be READ_ONCE(inet->hdrincl) |
| * but READ_ONCE() doesn't work with bit fields. |
| * Doing this indirectly yields the same result. |
| */ |
| hdrincl = inet->hdrincl; |
| hdrincl = READ_ONCE(hdrincl); |
| /* |
| * Check the flags. |
| */ |
| |
| err = -EOPNOTSUPP; |
| if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ |
| goto out; /* compatibility */ |
| |
| /* |
| * Get and verify the address. |
| */ |
| |
| if (msg->msg_namelen) { |
| DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
| err = -EINVAL; |
| if (msg->msg_namelen < sizeof(*usin)) |
| goto out; |
| if (usin->sin_family != AF_INET) { |
| pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", |
| __func__, current->comm); |
| err = -EAFNOSUPPORT; |
| if (usin->sin_family) |
| goto out; |
| } |
| daddr = usin->sin_addr.s_addr; |
| /* ANK: I did not forget to get protocol from port field. |
| * I just do not know, who uses this weirdness. |
| * IP_HDRINCL is much more convenient. |
| */ |
| } else { |
| err = -EDESTADDRREQ; |
| if (sk->sk_state != TCP_ESTABLISHED) |
| goto out; |
| daddr = inet->inet_daddr; |
| } |
| |
| ipcm_init_sk(&ipc, inet); |
| |
| if (msg->msg_controllen) { |
| err = ip_cmsg_send(sk, msg, &ipc, false); |
| if (unlikely(err)) { |
| kfree(ipc.opt); |
| goto out; |
| } |
| if (ipc.opt) |
| free = 1; |
| } |
| |
| saddr = ipc.addr; |
| ipc.addr = daddr; |
| |
| if (!ipc.opt) { |
| struct ip_options_rcu *inet_opt; |
| |
| rcu_read_lock(); |
| inet_opt = rcu_dereference(inet->inet_opt); |
| if (inet_opt) { |
| memcpy(&opt_copy, inet_opt, |
| sizeof(*inet_opt) + inet_opt->opt.optlen); |
| ipc.opt = &opt_copy.opt; |
| } |
| rcu_read_unlock(); |
| } |
| |
| if (ipc.opt) { |
| err = -EINVAL; |
| /* Linux does not mangle headers on raw sockets, |
| * so that IP options + IP_HDRINCL is non-sense. |
| */ |
| if (hdrincl) |
| goto done; |
| if (ipc.opt->opt.srr) { |
| if (!daddr) |
| goto done; |
| daddr = ipc.opt->opt.faddr; |
| } |
| } |
| tos = get_rtconn_flags(&ipc, sk); |
| if (msg->msg_flags & MSG_DONTROUTE) |
| tos |= RTO_ONLINK; |
| |
| if (ipv4_is_multicast(daddr)) { |
| if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) |
| ipc.oif = inet->mc_index; |
| if (!saddr) |
| saddr = inet->mc_addr; |
| } else if (!ipc.oif) { |
| ipc.oif = inet->uc_index; |
| } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { |
| /* oif is set, packet is to local broadcast and |
| * and uc_index is set. oif is most likely set |
| * by sk_bound_dev_if. If uc_index != oif check if the |
| * oif is an L3 master and uc_index is an L3 slave. |
| * If so, we want to allow the send using the uc_index. |
| */ |
| if (ipc.oif != inet->uc_index && |
| ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), |
| inet->uc_index)) { |
| ipc.oif = inet->uc_index; |
| } |
| } |
| |
| flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, |
| RT_SCOPE_UNIVERSE, |
| hdrincl ? IPPROTO_RAW : sk->sk_protocol, |
| inet_sk_flowi_flags(sk) | |
| (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), |
| daddr, saddr, 0, 0, sk->sk_uid); |
| |
| if (!hdrincl) { |
| rfv.msg = msg; |
| rfv.hlen = 0; |
| |
| err = raw_probe_proto_opt(&rfv, &fl4); |
| if (err) |
| goto done; |
| } |
| |
| security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
| rt = ip_route_output_flow(net, &fl4, sk); |
| if (IS_ERR(rt)) { |
| err = PTR_ERR(rt); |
| rt = NULL; |
| goto done; |
| } |
| |
| err = -EACCES; |
| if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) |
| goto done; |
| |
| if (msg->msg_flags & MSG_CONFIRM) |
| goto do_confirm; |
| back_from_confirm: |
| |
| if (hdrincl) |
| err = raw_send_hdrinc(sk, &fl4, msg, len, |
| &rt, msg->msg_flags, &ipc.sockc); |
| |
| else { |
| if (!ipc.addr) |
| ipc.addr = fl4.daddr; |
| lock_sock(sk); |
| err = ip_append_data(sk, &fl4, raw_getfrag, |
| &rfv, len, 0, |
| &ipc, &rt, msg->msg_flags); |
| if (err) |
| ip_flush_pending_frames(sk); |
| else if (!(msg->msg_flags & MSG_MORE)) { |
| err = ip_push_pending_frames(sk, &fl4); |
| if (err == -ENOBUFS && !inet->recverr) |
| err = 0; |
| } |
| release_sock(sk); |
| } |
| done: |
| if (free) |
| kfree(ipc.opt); |
| ip_rt_put(rt); |
| |
| out: |
| if (err < 0) |
| return err; |
| return len; |
| |
| do_confirm: |
| if (msg->msg_flags & MSG_PROBE) |
| dst_confirm_neigh(&rt->dst, &fl4.daddr); |
| if (!(msg->msg_flags & MSG_PROBE) || len) |
| goto back_from_confirm; |
| err = 0; |
| goto done; |
| } |
| |
| static void raw_close(struct sock *sk, long timeout) |
| { |
| /* |
| * Raw sockets may have direct kernel references. Kill them. |
| */ |
| ip_ra_control(sk, 0, NULL); |
| |
| sk_common_release(sk); |
| } |
| |
| static void raw_destroy(struct sock *sk) |
| { |
| lock_sock(sk); |
| ip_flush_pending_frames(sk); |
| release_sock(sk); |
| } |
| |
| /* This gets rid of all the nasties in af_inet. -DaveM */ |
| static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; |
| u32 tb_id = RT_TABLE_LOCAL; |
| int ret = -EINVAL; |
| int chk_addr_ret; |
| |
| if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) |
| goto out; |
| |
| if (sk->sk_bound_dev_if) |
| tb_id = l3mdev_fib_table_by_index(sock_net(sk), |
| sk->sk_bound_dev_if) ? : tb_id; |
| |
| chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, |
| tb_id); |
| |
| ret = -EADDRNOTAVAIL; |
| if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && |
| chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) |
| goto out; |
| inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; |
| if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
| inet->inet_saddr = 0; /* Use device */ |
| sk_dst_reset(sk); |
| ret = 0; |
| out: return ret; |
| } |
| |
| /* |
| * This should be easy, if there is something there |
| * we return it, otherwise we block. |
| */ |
| |
| static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
| int noblock, int flags, int *addr_len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| size_t copied = 0; |
| int err = -EOPNOTSUPP; |
| DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
| struct sk_buff *skb; |
| |
| if (flags & MSG_OOB) |
| goto out; |
| |
| if (flags & MSG_ERRQUEUE) { |
| err = ip_recv_error(sk, msg, len, addr_len); |
| goto out; |
| } |
| |
| skb = skb_recv_datagram(sk, flags, noblock, &err); |
| if (!skb) |
| goto out; |
| |
| copied = skb->len; |
| if (len < copied) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| |
| err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| if (err) |
| goto done; |
| |
| sock_recv_ts_and_drops(msg, sk, skb); |
| |
| /* Copy the address. */ |
| if (sin) { |
| sin->sin_family = AF_INET; |
| sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| sin->sin_port = 0; |
| memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| *addr_len = sizeof(*sin); |
| } |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| if (flags & MSG_TRUNC) |
| copied = skb->len; |
| done: |
| skb_free_datagram(sk, skb); |
| out: |
| if (err) |
| return err; |
| return copied; |
| } |
| |
| static int raw_sk_init(struct sock *sk) |
| { |
| struct raw_sock *rp = raw_sk(sk); |
| |
| if (inet_sk(sk)->inet_num == IPPROTO_ICMP) |
| memset(&rp->filter, 0, sizeof(rp->filter)); |
| return 0; |
| } |
| |
| static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) |
| { |
| if (optlen > sizeof(struct icmp_filter)) |
| optlen = sizeof(struct icmp_filter); |
| if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) |
| { |
| int len, ret = -EFAULT; |
| |
| if (get_user(len, optlen)) |
| goto out; |
| ret = -EINVAL; |
| if (len < 0) |
| goto out; |
| if (len > sizeof(struct icmp_filter)) |
| len = sizeof(struct icmp_filter); |
| ret = -EFAULT; |
| if (put_user(len, optlen) || |
| copy_to_user(optval, &raw_sk(sk)->filter, len)) |
| goto out; |
| ret = 0; |
| out: return ret; |
| } |
| |
| static int do_raw_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| if (optname == ICMP_FILTER) { |
| if (inet_sk(sk)->inet_num != IPPROTO_ICMP) |
| return -EOPNOTSUPP; |
| else |
| return raw_seticmpfilter(sk, optval, optlen); |
| } |
| return -ENOPROTOOPT; |
| } |
| |
| static int raw_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| if (level != SOL_RAW) |
| return ip_setsockopt(sk, level, optname, optval, optlen); |
| return do_raw_setsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int compat_raw_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| if (level != SOL_RAW) |
| return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
| return do_raw_setsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| static int do_raw_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| if (optname == ICMP_FILTER) { |
| if (inet_sk(sk)->inet_num != IPPROTO_ICMP) |
| return -EOPNOTSUPP; |
| else |
| return raw_geticmpfilter(sk, optval, optlen); |
| } |
| return -ENOPROTOOPT; |
| } |
| |
| static int raw_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| if (level != SOL_RAW) |
| return ip_getsockopt(sk, level, optname, optval, optlen); |
| return do_raw_getsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int compat_raw_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| if (level != SOL_RAW) |
| return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
| return do_raw_getsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case SIOCOUTQ: { |
| int amount = sk_wmem_alloc_get(sk); |
| |
| return put_user(amount, (int __user *)arg); |
| } |
| case SIOCINQ: { |
| struct sk_buff *skb; |
| int amount = 0; |
| |
| spin_lock_bh(&sk->sk_receive_queue.lock); |
| skb = skb_peek(&sk->sk_receive_queue); |
| if (skb) |
| amount = skb->len; |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| return put_user(amount, (int __user *)arg); |
| } |
| |
| default: |
| #ifdef CONFIG_IP_MROUTE |
| return ipmr_ioctl(sk, cmd, (void __user *)arg); |
| #else |
| return -ENOIOCTLCMD; |
| #endif |
| } |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case SIOCOUTQ: |
| case SIOCINQ: |
| return -ENOIOCTLCMD; |
| default: |
| #ifdef CONFIG_IP_MROUTE |
| return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); |
| #else |
| return -ENOIOCTLCMD; |
| #endif |
| } |
| } |
| #endif |
| |
| int raw_abort(struct sock *sk, int err) |
| { |
| lock_sock(sk); |
| |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| __udp_disconnect(sk, 0); |
| |
| release_sock(sk); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(raw_abort); |
| |
| struct proto raw_prot = { |
| .name = "RAW", |
| .owner = THIS_MODULE, |
| .close = raw_close, |
| .destroy = raw_destroy, |
| .connect = ip4_datagram_connect, |
| .disconnect = __udp_disconnect, |
| .ioctl = raw_ioctl, |
| .init = raw_sk_init, |
| .setsockopt = raw_setsockopt, |
| .getsockopt = raw_getsockopt, |
| .sendmsg = raw_sendmsg, |
| .recvmsg = raw_recvmsg, |
| .bind = raw_bind, |
| .backlog_rcv = raw_rcv_skb, |
| .release_cb = ip4_datagram_release_cb, |
| .hash = raw_hash_sk, |
| .unhash = raw_unhash_sk, |
| .obj_size = sizeof(struct raw_sock), |
| .useroffset = offsetof(struct raw_sock, filter), |
| .usersize = sizeof_field(struct raw_sock, filter), |
| .h.raw_hash = &raw_v4_hashinfo, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_raw_setsockopt, |
| .compat_getsockopt = compat_raw_getsockopt, |
| .compat_ioctl = compat_raw_ioctl, |
| #endif |
| .diag_destroy = raw_abort, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| static struct sock *raw_get_first(struct seq_file *seq) |
| { |
| struct sock *sk; |
| struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
| struct raw_iter_state *state = raw_seq_private(seq); |
| |
| for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; |
| ++state->bucket) { |
| sk_for_each(sk, &h->ht[state->bucket]) |
| if (sock_net(sk) == seq_file_net(seq)) |
| goto found; |
| } |
| sk = NULL; |
| found: |
| return sk; |
| } |
| |
| static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) |
| { |
| struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
| struct raw_iter_state *state = raw_seq_private(seq); |
| |
| do { |
| sk = sk_next(sk); |
| try_again: |
| ; |
| } while (sk && sock_net(sk) != seq_file_net(seq)); |
| |
| if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { |
| sk = sk_head(&h->ht[state->bucket]); |
| goto try_again; |
| } |
| return sk; |
| } |
| |
| static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) |
| { |
| struct sock *sk = raw_get_first(seq); |
| |
| if (sk) |
| while (pos && (sk = raw_get_next(seq, sk)) != NULL) |
| --pos; |
| return pos ? NULL : sk; |
| } |
| |
| void *raw_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
| |
| read_lock(&h->lock); |
| return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| } |
| EXPORT_SYMBOL_GPL(raw_seq_start); |
| |
| void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct sock *sk; |
| |
| if (v == SEQ_START_TOKEN) |
| sk = raw_get_first(seq); |
| else |
| sk = raw_get_next(seq, v); |
| ++*pos; |
| return sk; |
| } |
| EXPORT_SYMBOL_GPL(raw_seq_next); |
| |
| void raw_seq_stop(struct seq_file *seq, void *v) |
| { |
| struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); |
| |
| read_unlock(&h->lock); |
| } |
| EXPORT_SYMBOL_GPL(raw_seq_stop); |
| |
| static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) |
| { |
| struct inet_sock *inet = inet_sk(sp); |
| __be32 dest = inet->inet_daddr, |
| src = inet->inet_rcv_saddr; |
| __u16 destp = 0, |
| srcp = inet->inet_num; |
| |
| seq_printf(seq, "%4d: %08X:%04X %08X:%04X" |
| " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", |
| i, src, srcp, dest, destp, sp->sk_state, |
| sk_wmem_alloc_get(sp), |
| sk_rmem_alloc_get(sp), |
| 0, 0L, 0, |
| from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
| 0, sock_i_ino(sp), |
| refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); |
| } |
| |
| static int raw_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_printf(seq, " sl local_address rem_address st tx_queue " |
| "rx_queue tr tm->when retrnsmt uid timeout " |
| "inode ref pointer drops\n"); |
| else |
| raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); |
| return 0; |
| } |
| |
| static const struct seq_operations raw_seq_ops = { |
| .start = raw_seq_start, |
| .next = raw_seq_next, |
| .stop = raw_seq_stop, |
| .show = raw_seq_show, |
| }; |
| |
| static __net_init int raw_init_net(struct net *net) |
| { |
| if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, |
| sizeof(struct raw_iter_state), &raw_v4_hashinfo)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static __net_exit void raw_exit_net(struct net *net) |
| { |
| remove_proc_entry("raw", net->proc_net); |
| } |
| |
| static __net_initdata struct pernet_operations raw_net_ops = { |
| .init = raw_init_net, |
| .exit = raw_exit_net, |
| }; |
| |
| int __init raw_proc_init(void) |
| { |
| return register_pernet_subsys(&raw_net_ops); |
| } |
| |
| void __init raw_proc_exit(void) |
| { |
| unregister_pernet_subsys(&raw_net_ops); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| static void raw_sysctl_init_net(struct net *net) |
| { |
| #ifdef CONFIG_NET_L3_MASTER_DEV |
| net->ipv4.sysctl_raw_l3mdev_accept = 1; |
| #endif |
| } |
| |
| static int __net_init raw_sysctl_init(struct net *net) |
| { |
| raw_sysctl_init_net(net); |
| return 0; |
| } |
| |
| static struct pernet_operations __net_initdata raw_sysctl_ops = { |
| .init = raw_sysctl_init, |
| }; |
| |
| void __init raw_init(void) |
| { |
| raw_sysctl_init_net(&init_net); |
| if (register_pernet_subsys(&raw_sysctl_ops)) |
| panic("RAW: failed to init sysctl parameters.\n"); |
| } |