blob: 8b48512ebf6ac98ce279a7ca69daa6639970f1e3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * UDP over IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Based on linux/ipv4/udp.c
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/ipv6.h>
33#include <linux/icmpv6.h>
34#include <linux/init.h>
Herbert Xu1781f7f2007-12-11 11:30:32 -080035#include <linux/module.h>
Herbert Xu3305b802005-12-13 23:16:37 -080036#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <asm/uaccess.h>
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <net/ndisc.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <net/raw.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070044#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/ip6_checksum.h>
46#include <net/xfrm.h>
47
48#include <linux/proc_fs.h>
49#include <linux/seq_file.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080050#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -070052int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -070054 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Pavel Emelyanovfa4d3c62008-01-31 05:07:57 -080057static struct sock *__udp6_lib_lookup(struct net *net,
58 struct in6_addr *saddr, __be16 sport,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080059 struct in6_addr *daddr, __be16 dport,
60 int dif, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62 struct sock *sk, *result = NULL;
63 struct hlist_node *node;
64 unsigned short hnum = ntohs(dport);
65 int badness = -1;
66
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090067 read_lock(&udp_hash_lock);
Pavel Emelyanov19c75782008-06-16 17:12:29 -070068 sk_for_each(sk, node, &udptable[udp_hashfn(net, hnum)]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 struct inet_sock *inet = inet_sk(sk);
70
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +090071 if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
Pavel Emelyanovfa4d3c62008-01-31 05:07:57 -080072 sk->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 struct ipv6_pinfo *np = inet6_sk(sk);
74 int score = 0;
75 if (inet->dport) {
76 if (inet->dport != sport)
77 continue;
78 score++;
79 }
80 if (!ipv6_addr_any(&np->rcv_saddr)) {
81 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
82 continue;
83 score++;
84 }
85 if (!ipv6_addr_any(&np->daddr)) {
86 if (!ipv6_addr_equal(&np->daddr, saddr))
87 continue;
88 score++;
89 }
90 if (sk->sk_bound_dev_if) {
91 if (sk->sk_bound_dev_if != dif)
92 continue;
93 score++;
94 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -080095 if (score == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 result = sk;
97 break;
Stephen Hemmingeradd459a2007-03-08 20:42:35 -080098 } else if (score > badness) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 result = sk;
100 badness = score;
101 }
102 }
103 }
104 if (result)
105 sock_hold(result);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900106 read_unlock(&udp_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return result;
108}
109
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700110static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
111 __be16 sport, __be16 dport,
112 struct hlist_head udptable[])
113{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700114 struct sock *sk;
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700115 struct ipv6hdr *iph = ipv6_hdr(skb);
116
KOVACS Krisztian23542612008-10-07 12:41:01 -0700117 if (unlikely(sk = skb_steal_sock(skb)))
118 return sk;
119 else
120 return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
121 &iph->daddr, dport, inet6_iif(skb),
122 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700123}
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 * This should be easy, if there is something there we
127 * return it, otherwise we block.
128 */
129
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800130int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 struct msghdr *msg, size_t len,
132 int noblock, int flags, int *addr_len)
133{
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900136 struct sk_buff *skb;
Herbert Xu759e5d02007-03-25 20:10:56 -0700137 unsigned int ulen, copied;
Herbert Xua59322b2007-12-05 01:53:40 -0800138 int peeked;
Herbert Xu759e5d02007-03-25 20:10:56 -0700139 int err;
140 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000141 int is_udp4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900143 if (addr_len)
144 *addr_len=sizeof(struct sockaddr_in6);
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (flags & MSG_ERRQUEUE)
147 return ipv6_recv_error(sk, msg, len);
148
149try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800150 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
151 &peeked, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 if (!skb)
153 goto out;
154
Herbert Xu759e5d02007-03-25 20:10:56 -0700155 ulen = skb->len - sizeof(struct udphdr);
156 copied = len;
157 if (copied > ulen)
158 copied = ulen;
159 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900160 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Wei Yongjunf26ba172008-11-02 16:11:01 +0000162 is_udp4 = (skb->protocol == htons(ETH_P_IP));
163
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800164 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700165 * If checksum is needed at all, try to do it while copying the
166 * data. If the data is truncated, or if we only want a partial
167 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800168 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800169
Herbert Xu759e5d02007-03-25 20:10:56 -0700170 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
171 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800173 }
174
Herbert Xu60476372007-04-09 11:59:39 -0700175 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800176 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
177 msg->msg_iov, copied );
178 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
180 if (err == -EINVAL)
181 goto csum_copy_err;
182 }
183 if (err)
184 goto out_free;
185
Wei Yongjunf26ba172008-11-02 16:11:01 +0000186 if (!peeked) {
187 if (is_udp4)
188 UDP_INC_STATS_USER(sock_net(sk),
189 UDP_MIB_INDATAGRAMS, is_udplite);
190 else
191 UDP6_INC_STATS_USER(sock_net(sk),
192 UDP_MIB_INDATAGRAMS, is_udplite);
193 }
Wang Chencb759942007-12-03 22:33:28 +1100194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 sock_recv_timestamp(msg, sk, skb);
196
197 /* Copy the address. */
198 if (msg->msg_name) {
199 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 sin6 = (struct sockaddr_in6 *) msg->msg_name;
202 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300203 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 sin6->sin6_flowinfo = 0;
205 sin6->sin6_scope_id = 0;
206
Wei Yongjunf26ba172008-11-02 16:11:01 +0000207 if (is_udp4)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700209 htonl(0xffff), ip_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 else {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700211 ipv6_addr_copy(&sin6->sin6_addr,
212 &ipv6_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
214 sin6->sin6_scope_id = IP6CB(skb)->iif;
215 }
216
217 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000218 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (inet->cmsg_flags)
220 ip_cmsg_recv(msg, skb);
221 } else {
222 if (np->rxopt.all)
223 datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 err = copied;
227 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700228 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230out_free:
Hideo Aoki95766ff2007-12-31 00:29:24 -0800231 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 skb_free_datagram(sk, skb);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800233 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234out:
235 return err;
236
237csum_copy_err:
Hideo Aoki95766ff2007-12-31 00:29:24 -0800238 lock_sock(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000239 if (!skb_kill_datagram(sk, skb, flags)) {
240 if (is_udp4)
241 UDP_INC_STATS_USER(sock_net(sk),
242 UDP_MIB_INERRORS, is_udplite);
243 else
244 UDP6_INC_STATS_USER(sock_net(sk),
245 UDP_MIB_INERRORS, is_udplite);
246 }
Hideo Aoki95766ff2007-12-31 00:29:24 -0800247 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Mitsuru Chinen7a0ff7162007-11-05 21:29:17 -0800249 if (flags & MSG_DONTWAIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 goto try_again;
252}
253
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800254void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
255 int type, int code, int offset, __be32 info,
256 struct hlist_head udptable[] )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
258 struct ipv6_pinfo *np;
259 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 struct in6_addr *saddr = &hdr->saddr;
261 struct in6_addr *daddr = &hdr->daddr;
262 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
263 struct sock *sk;
264 int err;
265
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900266 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800267 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 if (sk == NULL)
269 return;
270
271 np = inet6_sk(sk);
272
273 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
274 goto out;
275
276 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
277 goto out;
278
279 if (np->recverr)
280 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
281
282 sk->sk_err = err;
283 sk->sk_error_report(sk);
284out:
285 sock_put(sk);
286}
287
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800288static __inline__ void udpv6_err(struct sk_buff *skb,
289 struct inet6_skb_parm *opt, int type,
Al Viro8e5200f2006-11-20 18:06:37 -0800290 int code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
YOSHIFUJI Hideaki77d0d352008-01-22 17:09:55 +0900292 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800293}
294
295int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
296{
297 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700298 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100299 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700300
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800301 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
302 goto drop;
303
304 /*
305 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
306 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100307 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800308
309 if (up->pcrlen == 0) { /* full coverage was set */
310 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
311 " %d while full coverage %d requested\n",
312 UDP_SKB_CB(skb)->cscov, skb->len);
313 goto drop;
314 }
315 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
316 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
317 "too small, need min %d\n",
318 UDP_SKB_CB(skb)->cscov, up->pcrlen);
319 goto drop;
320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
322
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800323 if (sk->sk_filter) {
324 if (udp_lib_checksum_complete(skb))
325 goto drop;
326 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
David S. Millera18135e2006-08-15 00:00:09 -0700328 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
329 /* Note that an ENOMEM error is charged twice */
Eric Dumazetcb61cb92008-06-17 21:04:56 -0700330 if (rc == -ENOMEM) {
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700331 UDP6_INC_STATS_BH(sock_net(sk),
332 UDP_MIB_RCVBUFERRORS, is_udplite);
Eric Dumazetcb61cb92008-06-17 21:04:56 -0700333 atomic_inc(&sk->sk_drops);
334 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800335 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
Wang Chencb759942007-12-03 22:33:28 +1100337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800339drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700340 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800341 kfree_skb(skb);
342 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Eric Dumazet920a4612008-11-01 21:22:23 -0700345static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Al Viroe69a4adc2006-11-14 20:56:00 -0800346 __be16 loc_port, struct in6_addr *loc_addr,
347 __be16 rmt_port, struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 int dif)
349{
350 struct hlist_node *node;
351 struct sock *s = sk;
352 unsigned short num = ntohs(loc_port);
353
354 sk_for_each_from(s, node) {
355 struct inet_sock *inet = inet_sk(s);
356
Eric Dumazet920a4612008-11-01 21:22:23 -0700357 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800358 continue;
359
Eric Dumazet95f30b32007-02-09 15:44:52 -0800360 if (s->sk_hash == num && s->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 struct ipv6_pinfo *np = inet6_sk(s);
362 if (inet->dport) {
363 if (inet->dport != rmt_port)
364 continue;
365 }
366 if (!ipv6_addr_any(&np->daddr) &&
367 !ipv6_addr_equal(&np->daddr, rmt_addr))
368 continue;
369
370 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
371 continue;
372
373 if (!ipv6_addr_any(&np->rcv_saddr)) {
David L Stevens40796c52005-09-14 21:10:20 -0700374 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
375 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800377 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 continue;
379 return s;
380 }
381 }
382 return NULL;
383}
384
385/*
386 * Note: called only from the BH handler context,
387 * so we don't need to lock the hashes.
388 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700389static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
390 struct in6_addr *saddr, struct in6_addr *daddr,
391 struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
393 struct sock *sk, *sk2;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300394 const struct udphdr *uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 int dif;
396
397 read_lock(&udp_hash_lock);
Pavel Emelyanov19c75782008-06-16 17:12:29 -0700398 sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800399 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700400 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (!sk) {
402 kfree_skb(skb);
403 goto out;
404 }
405
406 sk2 = sk;
Eric Dumazet920a4612008-11-01 21:22:23 -0700407 while ((sk2 = udp_v6_mcast_next(net, sk_next(sk2), uh->dest, daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 uh->source, saddr, dif))) {
409 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800410 if (buff) {
Herbert Xud97106e2008-08-09 00:35:05 -0700411 bh_lock_sock(sk2);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800412 if (!sock_owned_by_user(sk2))
413 udpv6_queue_rcv_skb(sk2, buff);
414 else
415 sk_add_backlog(sk2, buff);
416 bh_unlock_sock(sk2);
417 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 }
Herbert Xud97106e2008-08-09 00:35:05 -0700419 bh_lock_sock(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800420 if (!sock_owned_by_user(sk))
421 udpv6_queue_rcv_skb(sk, skb);
422 else
423 sk_add_backlog(sk, skb);
424 bh_unlock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425out:
426 read_unlock(&udp_hash_lock);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800427 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
429
Herbert Xu759e5d02007-03-25 20:10:56 -0700430static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
431 int proto)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800432{
Herbert Xu759e5d02007-03-25 20:10:56 -0700433 int err;
434
435 UDP_SKB_CB(skb)->partial_cov = 0;
436 UDP_SKB_CB(skb)->cscov = skb->len;
437
David S. Millerdb8dac22008-03-06 16:22:02 -0800438 if (proto == IPPROTO_UDPLITE) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700439 err = udplite_checksum_init(skb, uh);
440 if (err)
441 return err;
442 }
443
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800444 if (uh->check == 0) {
445 /* RFC 2460 section 8.1 says that we SHOULD log
446 this error. Well, it is reasonable.
447 */
448 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
449 return 1;
450 }
451 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700452 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700453 skb->len, proto, skb->csum))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800454 skb->ip_summed = CHECKSUM_UNNECESSARY;
455
Herbert Xu60476372007-04-09 11:59:39 -0700456 if (!skb_csum_unnecessary(skb))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700457 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
458 &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700459 skb->len, proto, 0));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800460
Herbert Xu759e5d02007-03-25 20:10:56 -0700461 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800462}
463
Herbert Xue5bbef22007-10-15 12:50:28 -0700464int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
Herbert Xu759e5d02007-03-25 20:10:56 -0700465 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900468 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 struct net_device *dev = skb->dev;
470 struct in6_addr *saddr, *daddr;
471 u32 ulen = 0;
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700472 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
475 goto short_packet;
476
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700477 saddr = &ipv6_hdr(skb)->saddr;
478 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300479 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800482 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 goto short_packet;
484
Herbert Xu759e5d02007-03-25 20:10:56 -0700485 if (proto == IPPROTO_UDP) {
486 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800488 /* Check for jumbo payload */
489 if (ulen == 0)
490 ulen = skb->len;
491
492 if (ulen < sizeof(*uh))
493 goto short_packet;
494
495 if (ulen < skb->len) {
496 if (pskb_trim_rcsum(skb, ulen))
497 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700498 saddr = &ipv6_hdr(skb)->saddr;
499 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300500 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800501 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 }
503
Herbert Xu759e5d02007-03-25 20:10:56 -0700504 if (udp6_csum_init(skb, uh, proto))
505 goto discard;
506
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900507 /*
508 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800510 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700511 return __udp6_lib_mcast_deliver(net, skb,
512 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514 /* Unicast */
515
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900516 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 * check socket cache ... must talk to Alan about his plans
518 * for sock caches... i'll skip this for now.
519 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700520 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 if (sk == NULL) {
523 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
524 goto discard;
525
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800526 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 goto discard;
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700528 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
529 proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
532
533 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800534 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 /* deliver */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900538
Herbert Xud97106e2008-08-09 00:35:05 -0700539 bh_lock_sock(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800540 if (!sock_owned_by_user(sk))
541 udpv6_queue_rcv_skb(sk, skb);
542 else
543 sk_add_backlog(sk, skb);
544 bh_unlock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 sock_put(sk);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800546 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900548short_packet:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800549 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
David S. Millerdb8dac22008-03-06 16:22:02 -0800550 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Herbert Xu759e5d02007-03-25 20:10:56 -0700551 ulen, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700554 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800558
Herbert Xue5bbef22007-10-15 12:50:28 -0700559static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800560{
Herbert Xue5bbef22007-10-15 12:50:28 -0700561 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800562}
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564/*
565 * Throw away all pending data and cancel the corking. Socket is locked.
566 */
567static void udp_v6_flush_pending_frames(struct sock *sk)
568{
569 struct udp_sock *up = udp_sk(sk);
570
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400571 if (up->pending == AF_INET)
572 udp_flush_pending_frames(sk);
573 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 up->len = 0;
575 up->pending = 0;
576 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578}
579
580/*
581 * Sending
582 */
583
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800584static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585{
586 struct sk_buff *skb;
587 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800588 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 struct inet_sock *inet = inet_sk(sk);
590 struct flowi *fl = &inet->cork.fl;
591 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100592 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800593 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 /* Grab the skbuff where UDP header space exists. */
596 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
597 goto out;
598
599 /*
600 * Create a UDP header
601 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300602 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 uh->source = fl->fl_ip_sport;
604 uh->dest = fl->fl_ip_dport;
605 uh->len = htons(up->len);
606 uh->check = 0;
607
Wang Chenb2bf1e22007-12-03 22:34:16 +1100608 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800609 csum = udplite_csum_outgoing(sk, skb);
610 else
611 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800613 /* add protocol-dependent pseudo-header */
614 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
615 up->len, fl->proto, csum );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800617 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 err = ip6_push_pending_frames(sk);
620out:
621 up->len = 0;
622 up->pending = 0;
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -0700623 if (!err)
Pavel Emelyanov235b9f72008-07-05 21:19:20 -0700624 UDP6_INC_STATS_USER(sock_net(sk),
625 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return err;
627}
628
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800629int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 struct msghdr *msg, size_t len)
631{
632 struct ipv6_txoptions opt_space;
633 struct udp_sock *up = udp_sk(sk);
634 struct inet_sock *inet = inet_sk(sk);
635 struct ipv6_pinfo *np = inet6_sk(sk);
636 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
637 struct in6_addr *daddr, *final_p = NULL, final;
638 struct ipv6_txoptions *opt = NULL;
639 struct ip6_flowlabel *flowlabel = NULL;
Herbert Xu132a55f2006-10-03 14:34:00 -0700640 struct flowi fl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 struct dst_entry *dst;
642 int addr_len = msg->msg_namelen;
643 int ulen = len;
644 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900645 int tclass = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
647 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700648 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100649 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800650 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 /* destination address check */
653 if (sin6) {
654 if (addr_len < offsetof(struct sockaddr, sa_data))
655 return -EINVAL;
656
657 switch (sin6->sin6_family) {
658 case AF_INET6:
659 if (addr_len < SIN6_LEN_RFC2133)
660 return -EINVAL;
661 daddr = &sin6->sin6_addr;
662 break;
663 case AF_INET:
664 goto do_udp_sendmsg;
665 case AF_UNSPEC:
666 msg->msg_name = sin6 = NULL;
667 msg->msg_namelen = addr_len = 0;
668 daddr = NULL;
669 break;
670 default:
671 return -EINVAL;
672 }
673 } else if (!up->pending) {
674 if (sk->sk_state != TCP_ESTABLISHED)
675 return -EDESTADDRREQ;
676 daddr = &np->daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900677 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 daddr = NULL;
679
680 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -0700681 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 struct sockaddr_in sin;
683 sin.sin_family = AF_INET;
684 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
685 sin.sin_addr.s_addr = daddr->s6_addr32[3];
686 msg->msg_name = &sin;
687 msg->msg_namelen = sizeof(sin);
688do_udp_sendmsg:
689 if (__ipv6_only_sock(sk))
690 return -ENETUNREACH;
691 return udp_sendmsg(iocb, sk, msg, len);
692 }
693 }
694
695 if (up->pending == AF_INET)
696 return udp_sendmsg(iocb, sk, msg, len);
697
698 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -0700699 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 */
701 if (len > INT_MAX - sizeof(struct udphdr))
702 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 if (up->pending) {
705 /*
706 * There are pending frames.
707 * The socket lock must be held while it's corked.
708 */
709 lock_sock(sk);
710 if (likely(up->pending)) {
711 if (unlikely(up->pending != AF_INET6)) {
712 release_sock(sk);
713 return -EAFNOSUPPORT;
714 }
715 dst = NULL;
716 goto do_append_data;
717 }
718 release_sock(sk);
719 }
720 ulen += sizeof(struct udphdr);
721
Herbert Xu132a55f2006-10-03 14:34:00 -0700722 memset(&fl, 0, sizeof(fl));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 if (sin6) {
725 if (sin6->sin6_port == 0)
726 return -EINVAL;
727
Herbert Xu132a55f2006-10-03 14:34:00 -0700728 fl.fl_ip_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 daddr = &sin6->sin6_addr;
730
731 if (np->sndflow) {
Herbert Xu132a55f2006-10-03 14:34:00 -0700732 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
733 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
734 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 if (flowlabel == NULL)
736 return -EINVAL;
737 daddr = &flowlabel->dst;
738 }
739 }
740
741 /*
742 * Otherwise it will be difficult to maintain
743 * sk->sk_dst_cache.
744 */
745 if (sk->sk_state == TCP_ESTABLISHED &&
746 ipv6_addr_equal(daddr, &np->daddr))
747 daddr = &np->daddr;
748
749 if (addr_len >= sizeof(struct sockaddr_in6) &&
750 sin6->sin6_scope_id &&
751 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
Herbert Xu132a55f2006-10-03 14:34:00 -0700752 fl.oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 } else {
754 if (sk->sk_state != TCP_ESTABLISHED)
755 return -EDESTADDRREQ;
756
Herbert Xu132a55f2006-10-03 14:34:00 -0700757 fl.fl_ip_dport = inet->dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 daddr = &np->daddr;
Herbert Xu132a55f2006-10-03 14:34:00 -0700759 fl.fl6_flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700760 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 }
762
Herbert Xu132a55f2006-10-03 14:34:00 -0700763 if (!fl.oif)
764 fl.oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766 if (msg->msg_controllen) {
767 opt = &opt_space;
768 memset(opt, 0, sizeof(struct ipv6_txoptions));
769 opt->tot_len = sizeof(*opt);
770
YOSHIFUJI Hideaki91e19082008-06-04 13:02:49 +0900771 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 if (err < 0) {
773 fl6_sock_release(flowlabel);
774 return err;
775 }
Herbert Xu132a55f2006-10-03 14:34:00 -0700776 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
777 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 if (flowlabel == NULL)
779 return -EINVAL;
780 }
781 if (!(opt->opt_nflen|opt->opt_flen))
782 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700783 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 }
785 if (opt == NULL)
786 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900787 if (flowlabel)
788 opt = fl6_merge_options(&opt_space, flowlabel, opt);
789 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800791 fl.proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -0400792 if (!ipv6_addr_any(daddr))
793 ipv6_addr_copy(&fl.fl6_dst, daddr);
794 else
795 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
Herbert Xu132a55f2006-10-03 14:34:00 -0700796 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
797 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
798 fl.fl_ip_sport = inet->sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900799
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 /* merge ip6_build_xmit from ip6_output */
801 if (opt && opt->srcrt) {
802 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
Herbert Xu132a55f2006-10-03 14:34:00 -0700803 ipv6_addr_copy(&final, &fl.fl6_dst);
804 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 final_p = &final;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700806 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808
Herbert Xu132a55f2006-10-03 14:34:00 -0700809 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
810 fl.oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700811 connected = 0;
812 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Herbert Xu132a55f2006-10-03 14:34:00 -0700814 security_sk_classify_flow(sk, &fl);
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700815
Herbert Xu132a55f2006-10-03 14:34:00 -0700816 err = ip6_sk_dst_lookup(sk, &dst, &fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 if (err)
818 goto out;
819 if (final_p)
Herbert Xu132a55f2006-10-03 14:34:00 -0700820 ipv6_addr_copy(&fl.fl6_dst, final_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Herbert Xubb728452007-12-12 18:48:58 -0800822 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
David S. Miller14e50e52007-05-24 18:17:54 -0700823 if (err == -EREMOTE)
824 err = ip6_dst_blackhole(sk, &dst, &fl);
825 if (err < 0)
826 goto out;
827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
829 if (hlimit < 0) {
Herbert Xu132a55f2006-10-03 14:34:00 -0700830 if (ipv6_addr_is_multicast(&fl.fl6_dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 hlimit = np->mcast_hops;
832 else
833 hlimit = np->hop_limit;
834 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -0400835 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
837
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900838 if (tclass < 0) {
839 tclass = np->tclass;
840 if (tclass < 0)
841 tclass = 0;
842 }
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 if (msg->msg_flags&MSG_CONFIRM)
845 goto do_confirm;
846back_from_confirm:
847
848 lock_sock(sk);
849 if (unlikely(up->pending)) {
850 /* The socket is already corked while preparing it. */
851 /* ... which is an evident application bug. --ANK */
852 release_sock(sk);
853
Patrick McHardy64ce2072005-08-09 20:50:53 -0700854 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 err = -EINVAL;
856 goto out;
857 }
858
859 up->pending = AF_INET6;
860
861do_append_data:
862 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800863 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
864 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
Herbert Xu132a55f2006-10-03 14:34:00 -0700865 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900866 (struct rt6_info*)dst,
867 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 if (err)
869 udp_v6_flush_pending_frames(sk);
870 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800871 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -0700872 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
873 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
David S. Millera5e7c212005-10-03 14:21:58 -0700875 if (dst) {
876 if (connected) {
877 ip6_dst_store(sk, dst,
Herbert Xu132a55f2006-10-03 14:34:00 -0700878 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700879 &np->daddr : NULL,
880#ifdef CONFIG_IPV6_SUBTREES
Herbert Xu132a55f2006-10-03 14:34:00 -0700881 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700882 &np->saddr :
883#endif
884 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -0700885 } else {
886 dst_release(dst);
887 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +0900888 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -0700889 }
890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 if (err > 0)
892 err = np->recverr ? net_xmit_errno(err) : 0;
893 release_sock(sk);
894out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +0900895 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -0700897 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 return len;
David S. Millera18135e2006-08-15 00:00:09 -0700899 /*
900 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
901 * ENOBUFS might not be good (it's not tunable per se), but otherwise
902 * we don't have a good statistic (IpOutDiscards but it can be too many
903 * things). We could add another new stat but at least for now that
904 * seems like overkill.
905 */
906 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -0700907 UDP6_INC_STATS_USER(sock_net(sk),
908 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -0700909 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 return err;
911
912do_confirm:
913 dst_confirm(dst);
914 if (!(msg->msg_flags&MSG_PROBE) || len)
915 goto back_from_confirm;
916 err = 0;
917 goto out;
918}
919
Brian Haley7d06b2e2008-06-14 17:04:49 -0700920void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921{
922 lock_sock(sk);
923 udp_v6_flush_pending_frames(sk);
924 release_sock(sk);
925
926 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
928
929/*
930 * Socket option code for UDP
931 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800932int udpv6_setsockopt(struct sock *sk, int level, int optname,
933 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800934{
David S. Millerdb8dac22008-03-06 16:22:02 -0800935 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800936 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
937 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800938 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800939}
940
941#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800942int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
943 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800944{
David S. Millerdb8dac22008-03-06 16:22:02 -0800945 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800946 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
947 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800948 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800949}
950#endif
951
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800952int udpv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800954{
David S. Millerdb8dac22008-03-06 16:22:02 -0800955 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800956 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800957 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800958}
959
960#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800961int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
962 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800963{
David S. Millerdb8dac22008-03-06 16:22:02 -0800964 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800965 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800966 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800967}
968#endif
969
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970static struct inet6_protocol udpv6_protocol = {
971 .handler = udpv6_rcv,
972 .err_handler = udpv6_err,
973 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
974};
975
976/* ------------------------------------------------------------------------ */
977#ifdef CONFIG_PROC_FS
978
979static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
980{
981 struct inet_sock *inet = inet_sk(sp);
982 struct ipv6_pinfo *np = inet6_sk(sp);
983 struct in6_addr *dest, *src;
984 __u16 destp, srcp;
985
986 dest = &np->daddr;
987 src = &np->rcv_saddr;
988 destp = ntohs(inet->dport);
989 srcp = ntohs(inet->sport);
990 seq_printf(seq,
991 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
Eric Dumazetcb61cb92008-06-17 21:04:56 -0700992 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 bucket,
994 src->s6_addr32[0], src->s6_addr32[1],
995 src->s6_addr32[2], src->s6_addr32[3], srcp,
996 dest->s6_addr32[0], dest->s6_addr32[1],
997 dest->s6_addr32[2], dest->s6_addr32[3], destp,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900998 sp->sk_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 atomic_read(&sp->sk_wmem_alloc),
1000 atomic_read(&sp->sk_rmem_alloc),
1001 0, 0L, 0,
1002 sock_i_uid(sp), 0,
1003 sock_i_ino(sp),
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001004 atomic_read(&sp->sk_refcnt), sp,
1005 atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006}
1007
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001008int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
1010 if (v == SEQ_START_TOKEN)
1011 seq_printf(seq,
1012 " sl "
1013 "local_address "
1014 "remote_address "
1015 "st tx_queue rx_queue tr tm->when retrnsmt"
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001016 " uid timeout inode ref pointer drops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 else
1018 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1019 return 0;
1020}
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 .name = "udp6",
1024 .family = AF_INET6,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001025 .hashtable = udp_hash,
Denis V. Lunev4ad96d32008-03-28 18:25:53 -07001026 .seq_fops = {
1027 .owner = THIS_MODULE,
1028 },
Denis V. Lunevdda61922008-03-28 18:24:26 -07001029 .seq_ops = {
1030 .show = udp6_seq_show,
1031 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032};
1033
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001034int udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001036 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037}
1038
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001039void udp6_proc_exit(struct net *net) {
1040 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041}
1042#endif /* CONFIG_PROC_FS */
1043
1044/* ------------------------------------------------------------------------ */
1045
1046struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001047 .name = "UDPv6",
1048 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001049 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001050 .connect = ip6_datagram_connect,
1051 .disconnect = udp_disconnect,
1052 .ioctl = udp_ioctl,
1053 .destroy = udpv6_destroy_sock,
1054 .setsockopt = udpv6_setsockopt,
1055 .getsockopt = udpv6_getsockopt,
1056 .sendmsg = udpv6_sendmsg,
1057 .recvmsg = udpv6_recvmsg,
1058 .backlog_rcv = udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001059 .hash = udp_lib_hash,
1060 .unhash = udp_lib_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001061 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001062 .memory_allocated = &udp_memory_allocated,
1063 .sysctl_mem = sysctl_udp_mem,
1064 .sysctl_wmem = &sysctl_udp_wmem_min,
1065 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001066 .obj_size = sizeof(struct udp6_sock),
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -07001067 .h.udp_hash = udp_hash,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001068#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001069 .compat_setsockopt = compat_udpv6_setsockopt,
1070 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001071#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072};
1073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074static struct inet_protosw udpv6_protosw = {
1075 .type = SOCK_DGRAM,
1076 .protocol = IPPROTO_UDP,
1077 .prot = &udpv6_prot,
1078 .ops = &inet6_dgram_ops,
1079 .capability =-1,
1080 .no_check = UDP_CSUM_DEFAULT,
1081 .flags = INET_PROTOSW_PERMANENT,
1082};
1083
1084
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001085int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001087 int ret;
1088
1089 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1090 if (ret)
1091 goto out;
1092
1093 ret = inet6_register_protosw(&udpv6_protosw);
1094 if (ret)
1095 goto out_udpv6_protocol;
1096out:
1097 return ret;
1098
1099out_udpv6_protocol:
1100 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1101 goto out;
1102}
1103
Daniel Lezcano09f77092007-12-13 05:34:58 -08001104void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001105{
1106 inet6_unregister_protosw(&udpv6_protosw);
1107 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108}