blob: dfaa29b8b2939c03fef13fa416f6fdaef031bf5d [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/uaccess.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <net/raw.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070045#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <net/ip6_checksum.h>
47#include <net/xfrm.h>
48
49#include <linux/proc_fs.h>
50#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000051#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080052#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000054int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
55{
56 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
57 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
Eric Dumazet68835ab2010-11-30 19:04:07 +000058 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
59 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000060 int sk_ipv6only = ipv6_only_sock(sk);
61 int sk2_ipv6only = inet_v6_ipv6only(sk2);
62 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
63 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
64
65 /* if both are mapped, treat as IPv4 */
66 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
Vlad Yasevich499923c2009-04-09 17:37:33 +000067 return (!sk2_ipv6only &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +000068 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
69 sk1_rcv_saddr == sk2_rcv_saddr));
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000070
71 if (addr_type2 == IPV6_ADDR_ANY &&
72 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
73 return 1;
74
75 if (addr_type == IPV6_ADDR_ANY &&
76 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
77 return 1;
78
79 if (sk2_rcv_saddr6 &&
80 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
81 return 1;
82
83 return 0;
84}
85
Eric Dumazetd4cada42009-11-08 10:17:30 +000086static unsigned int udp6_portaddr_hash(struct net *net,
87 const struct in6_addr *addr6,
88 unsigned int port)
89{
90 unsigned int hash, mix = net_hash_mix(net);
91
92 if (ipv6_addr_any(addr6))
93 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +000094 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -070095 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000096 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -070097 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000098
99 return hash ^ port;
100}
101
102
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700103int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Eric Dumazet30fff922009-11-09 05:26:33 +0000105 unsigned int hash2_nulladdr =
106 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000107 unsigned int hash2_partial =
Eric Dumazet30fff922009-11-09 05:26:33 +0000108 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
109
Eric Dumazetd4cada42009-11-08 10:17:30 +0000110 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000111 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
112 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
Eric Dumazet719f8352010-09-08 05:08:44 +0000115static void udp_v6_rehash(struct sock *sk)
116{
117 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
118 &inet6_sk(sk)->rcv_saddr,
119 inet_sk(sk)->inet_num);
120
121 udp_lib_rehash(sk, new_hash);
122}
123
Eric Dumazet645ca702008-10-29 01:41:45 -0700124static inline int compute_score(struct sock *sk, struct net *net,
125 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200126 const struct in6_addr *saddr, __be16 sport,
127 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700128 int dif)
129{
130 int score = -1;
131
Eric Dumazetd4cada42009-11-08 10:17:30 +0000132 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
Eric Dumazet645ca702008-10-29 01:41:45 -0700133 sk->sk_family == PF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
136
137 score = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000138 if (inet->inet_dport) {
139 if (inet->inet_dport != sport)
Eric Dumazet645ca702008-10-29 01:41:45 -0700140 return -1;
141 score++;
142 }
143 if (!ipv6_addr_any(&np->rcv_saddr)) {
144 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
145 return -1;
146 score++;
147 }
148 if (!ipv6_addr_any(&np->daddr)) {
149 if (!ipv6_addr_equal(&np->daddr, saddr))
150 return -1;
151 score++;
152 }
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158 }
159 return score;
160}
161
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000162#define SCORE2_MAX (1 + 1 + 1)
163static inline int compute_score2(struct sock *sk, struct net *net,
164 const struct in6_addr *saddr, __be16 sport,
165 const struct in6_addr *daddr, unsigned short hnum,
166 int dif)
167{
168 int score = -1;
169
170 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
171 sk->sk_family == PF_INET6) {
172 struct ipv6_pinfo *np = inet6_sk(sk);
173 struct inet_sock *inet = inet_sk(sk);
174
175 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
176 return -1;
177 score = 0;
178 if (inet->inet_dport) {
179 if (inet->inet_dport != sport)
180 return -1;
181 score++;
182 }
183 if (!ipv6_addr_any(&np->daddr)) {
184 if (!ipv6_addr_equal(&np->daddr, saddr))
185 return -1;
186 score++;
187 }
188 if (sk->sk_bound_dev_if) {
189 if (sk->sk_bound_dev_if != dif)
190 return -1;
191 score++;
192 }
193 }
194 return score;
195}
196
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000197
198/* called with read_rcu_lock() */
199static struct sock *udp6_lib_lookup2(struct net *net,
200 const struct in6_addr *saddr, __be16 sport,
201 const struct in6_addr *daddr, unsigned int hnum, int dif,
202 struct udp_hslot *hslot2, unsigned int slot2)
203{
204 struct sock *sk, *result;
205 struct hlist_nulls_node *node;
206 int score, badness;
207
208begin:
209 result = NULL;
210 badness = -1;
211 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
212 score = compute_score2(sk, net, saddr, sport,
213 daddr, hnum, dif);
214 if (score > badness) {
215 result = sk;
216 badness = score;
217 if (score == SCORE2_MAX)
218 goto exact_match;
219 }
220 }
221 /*
222 * if the nulls value we got at the end of this lookup is
223 * not the expected one, we must restart lookup.
224 * We probably met an item that was moved to another chain.
225 */
226 if (get_nulls_value(node) != slot2)
227 goto begin;
228
229 if (result) {
230exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000231 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000232 result = NULL;
233 else if (unlikely(compute_score2(result, net, saddr, sport,
234 daddr, hnum, dif) < badness)) {
235 sock_put(result);
236 goto begin;
237 }
238 }
239 return result;
240}
241
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000242struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200243 const struct in6_addr *saddr, __be16 sport,
244 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700245 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700247 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800248 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000250 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
251 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Eric Dumazet271b72c2008-10-29 02:11:14 -0700252 int score, badness;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Eric Dumazet271b72c2008-10-29 02:11:14 -0700254 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000255 if (hslot->count > 10) {
256 hash2 = udp6_portaddr_hash(net, daddr, hnum);
257 slot2 = hash2 & udptable->mask;
258 hslot2 = &udptable->hash2[slot2];
259 if (hslot->count < hslot2->count)
260 goto begin;
261
262 result = udp6_lib_lookup2(net, saddr, sport,
263 daddr, hnum, dif,
264 hslot2, slot2);
265 if (!result) {
266 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
267 slot2 = hash2 & udptable->mask;
268 hslot2 = &udptable->hash2[slot2];
269 if (hslot->count < hslot2->count)
270 goto begin;
271
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000272 result = udp6_lib_lookup2(net, saddr, sport,
273 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000274 hslot2, slot2);
275 }
276 rcu_read_unlock();
277 return result;
278 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700279begin:
280 result = NULL;
281 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800282 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700283 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
284 if (score > badness) {
285 result = sk;
286 badness = score;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
288 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800289 /*
290 * if the nulls value we got at the end of this lookup is
291 * not the expected one, we must restart lookup.
292 * We probably met an item that was moved to another chain.
293 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000294 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800295 goto begin;
296
Eric Dumazet271b72c2008-10-29 02:11:14 -0700297 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000298 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700299 result = NULL;
300 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
301 daddr, dport, dif) < badness)) {
302 sock_put(result);
303 goto begin;
304 }
305 }
306 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return result;
308}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000309EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700311static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
312 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700313 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700314{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700315 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000316 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700317
KOVACS Krisztian23542612008-10-07 12:41:01 -0700318 if (unlikely(sk = skb_steal_sock(skb)))
319 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000320 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
321 &iph->daddr, dport, inet6_iif(skb),
322 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700323}
324
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200325struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
326 const struct in6_addr *daddr, __be16 dport, int dif)
327{
328 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
329}
330EXPORT_SYMBOL_GPL(udp6_lib_lookup);
331
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 * This should be easy, if there is something there we
335 * return it, otherwise we block.
336 */
337
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800338int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 struct msghdr *msg, size_t len,
340 int noblock, int flags, int *addr_len)
341{
342 struct ipv6_pinfo *np = inet6_sk(sk);
343 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900344 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500345 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000346 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700347 int err;
348 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000349 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000350 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900352 if (addr_len)
Jeffrin Jose3dde2592012-05-19 01:59:04 +0000353 *addr_len = sizeof(struct sockaddr_in6);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 if (flags & MSG_ERRQUEUE)
356 return ipv6_recv_error(sk, msg, len);
357
Brian Haley4b340ae2010-04-23 11:26:09 +0000358 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
359 return ipv6_recv_rxpmtu(sk, msg, len);
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800362 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000363 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if (!skb)
365 goto out;
366
Herbert Xu759e5d02007-03-25 20:10:56 -0700367 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500368 copied = len;
369 if (copied > ulen)
370 copied = ulen;
371 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900372 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Wei Yongjunf26ba172008-11-02 16:11:01 +0000374 is_udp4 = (skb->protocol == htons(ETH_P_IP));
375
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800376 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700377 * If checksum is needed at all, try to do it while copying the
378 * data. If the data is truncated, or if we only want a partial
379 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800380 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800381
David S. Miller59c2cda2011-12-01 14:12:55 -0500382 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700383 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800385 }
386
Herbert Xu60476372007-04-09 11:59:39 -0700387 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800388 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
Eric Dumazet22911fc2012-06-27 00:23:44 +0000389 msg->msg_iov, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800390 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
392 if (err == -EINVAL)
393 goto csum_copy_err;
394 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000395 if (unlikely(err)) {
396 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000397 if (!peeked) {
398 atomic_inc(&sk->sk_drops);
399 if (is_udp4)
400 UDP_INC_STATS_USER(sock_net(sk),
401 UDP_MIB_INERRORS,
402 is_udplite);
403 else
404 UDP6_INC_STATS_USER(sock_net(sk),
405 UDP_MIB_INERRORS,
406 is_udplite);
407 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000409 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000410 if (!peeked) {
411 if (is_udp4)
412 UDP_INC_STATS_USER(sock_net(sk),
413 UDP_MIB_INDATAGRAMS, is_udplite);
414 else
415 UDP6_INC_STATS_USER(sock_net(sk),
416 UDP_MIB_INDATAGRAMS, is_udplite);
417 }
Wang Chencb759942007-12-03 22:33:28 +1100418
Neil Horman3b885782009-10-12 13:26:31 -0700419 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 /* Copy the address. */
422 if (msg->msg_name) {
423 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 sin6 = (struct sockaddr_in6 *) msg->msg_name;
426 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300427 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 sin6->sin6_flowinfo = 0;
429 sin6->sin6_scope_id = 0;
430
Wei Yongjunf26ba172008-11-02 16:11:01 +0000431 if (is_udp4)
Brian Haleyb301e822009-10-07 13:58:25 -0700432 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
433 &sin6->sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000435 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
437 sin6->sin6_scope_id = IP6CB(skb)->iif;
438 }
439
440 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000441 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (inet->cmsg_flags)
443 ip_cmsg_recv(msg, skb);
444 } else {
445 if (np->rxopt.all)
446 datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900447 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
David S. Miller59c2cda2011-12-01 14:12:55 -0500449 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700451 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000454 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455out:
456 return err;
457
458csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000459 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000460 if (!skb_kill_datagram(sk, skb, flags)) {
461 if (is_udp4)
462 UDP_INC_STATS_USER(sock_net(sk),
463 UDP_MIB_INERRORS, is_udplite);
464 else
465 UDP6_INC_STATS_USER(sock_net(sk),
466 UDP_MIB_INERRORS, is_udplite);
467 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000468 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Xufeng Zhang32c90252011-06-21 10:43:39 +0000470 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000472
473 /* starting over for a new packet */
474 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 goto try_again;
476}
477
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800478void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700479 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700480 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
482 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000483 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
484 const struct in6_addr *saddr = &hdr->saddr;
485 const struct in6_addr *daddr = &hdr->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
487 struct sock *sk;
488 int err;
489
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900490 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800491 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (sk == NULL)
493 return;
494
David S. Miller81aded22012-06-15 14:54:11 -0700495 if (type == ICMPV6_PKT_TOOBIG)
496 ip6_sk_update_pmtu(skb, sk, info);
David S. Millerec18d9a2012-07-12 00:25:15 -0700497 if (type == NDISC_REDIRECT)
498 ip6_sk_redirect(skb, sk);
David S. Miller81aded22012-06-15 14:54:11 -0700499
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 np = inet6_sk(sk);
501
502 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
503 goto out;
504
505 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
506 goto out;
507
Eric Dumazetb1faf562010-05-31 23:44:05 -0700508 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700510
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 sk->sk_err = err;
512 sk->sk_error_report(sk);
513out:
514 sock_put(sk);
515}
516
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000517static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
518{
519 int rc;
520
521 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
522 sock_rps_save_rxhash(sk, skb);
523
524 rc = sock_queue_rcv_skb(sk, skb);
525 if (rc < 0) {
526 int is_udplite = IS_UDPLITE(sk);
527
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
530 UDP6_INC_STATS_BH(sock_net(sk),
531 UDP_MIB_RCVBUFERRORS, is_udplite);
532 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
533 kfree_skb(skb);
534 return -1;
535 }
536 return 0;
537}
538
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800539static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700540 struct inet6_skb_parm *opt, u8 type,
541 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
Eric Dumazet645ca702008-10-29 01:41:45 -0700543 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800544}
545
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000546static struct static_key udpv6_encap_needed __read_mostly;
547void udpv6_encap_enable(void)
548{
549 if (!static_key_enabled(&udpv6_encap_needed))
550 static_key_slow_inc(&udpv6_encap_needed);
551}
552EXPORT_SYMBOL(udpv6_encap_enable);
553
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000554int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800555{
556 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700557 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100558 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700559
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
561 goto drop;
562
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
565
566 /*
567 * This is an encapsulation socket so pass the skb to
568 * the socket's udp_encap_rcv() hook. Otherwise, just
569 * fall through and pass this up the UDP socket.
570 * up->encap_rcv() returns the following value:
571 * =0 if skb was successfully passed to the encap
572 * handler or was discarded by it.
573 * >0 if skb should be passed on to UDP.
574 * <0 if skb should be resubmitted as proto -N
575 */
576
577 /* if we're overly short, let UDP handle it */
578 encap_rcv = ACCESS_ONCE(up->encap_rcv);
579 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
580 int ret;
581
582 ret = encap_rcv(sk, skb);
583 if (ret <= 0) {
584 UDP_INC_STATS_BH(sock_net(sk),
585 UDP_MIB_INDATAGRAMS,
586 is_udplite);
587 return -ret;
588 }
589 }
590
591 /* FALLTHROUGH -- it's a UDP Packet */
592 }
593
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800594 /*
595 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
596 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100597 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800598
599 if (up->pcrlen == 0) { /* full coverage was set */
600 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
601 " %d while full coverage %d requested\n",
602 UDP_SKB_CB(skb)->cscov, skb->len);
603 goto drop;
604 }
605 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
606 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
607 "too small, need min %d\n",
608 UDP_SKB_CB(skb)->cscov, up->pcrlen);
609 goto drop;
610 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 }
612
Eric Dumazet33d480c2011-08-11 19:30:52 +0000613 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800614 if (udp_lib_checksum_complete(skb))
615 goto drop;
616 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000618 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
619 goto drop;
620
Eric Dumazetd826eb12011-11-09 07:24:35 +0000621 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100622
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000623 bh_lock_sock(sk);
624 rc = 0;
625 if (!sock_owned_by_user(sk))
626 rc = __udpv6_queue_rcv_skb(sk, skb);
627 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
628 bh_unlock_sock(sk);
629 goto drop;
630 }
631 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000632
633 return rc;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800634drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700635 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000636 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800637 kfree_skb(skb);
638 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640
Eric Dumazet920a4612008-11-01 21:22:23 -0700641static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000642 __be16 loc_port, const struct in6_addr *loc_addr,
643 __be16 rmt_port, const struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 int dif)
645{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800646 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 struct sock *s = sk;
648 unsigned short num = ntohs(loc_port);
649
Eric Dumazet88ab1932008-11-16 19:39:21 -0800650 sk_nulls_for_each_from(s, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 struct inet_sock *inet = inet_sk(s);
652
Eric Dumazet920a4612008-11-01 21:22:23 -0700653 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800654 continue;
655
Eric Dumazetd4cada42009-11-08 10:17:30 +0000656 if (udp_sk(s)->udp_port_hash == num &&
657 s->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 struct ipv6_pinfo *np = inet6_sk(s);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000659 if (inet->inet_dport) {
660 if (inet->inet_dport != rmt_port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 continue;
662 }
663 if (!ipv6_addr_any(&np->daddr) &&
664 !ipv6_addr_equal(&np->daddr, rmt_addr))
665 continue;
666
667 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
668 continue;
669
670 if (!ipv6_addr_any(&np->rcv_saddr)) {
David L Stevens40796c52005-09-14 21:10:20 -0700671 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
672 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800674 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 continue;
676 return s;
677 }
678 }
679 return NULL;
680}
681
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000682static void flush_stack(struct sock **stack, unsigned int count,
683 struct sk_buff *skb, unsigned int final)
684{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000685 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000686 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000687 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000688
689 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000690 sk = stack[i];
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000691 if (likely(skb1 == NULL))
692 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
693 if (!skb1) {
694 atomic_inc(&sk->sk_drops);
695 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
696 IS_UDPLITE(sk));
697 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
698 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000699 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000700
701 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
702 skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000703 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000704 if (unlikely(skb1))
705 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000706}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707/*
708 * Note: called only from the BH handler context,
709 * so we don't need to lock the hashes.
710 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700711static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000712 const struct in6_addr *saddr, const struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700713 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000715 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300716 const struct udphdr *uh = udp_hdr(skb);
Eric Dumazetf86dcc52009-10-07 00:37:59 +0000717 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 int dif;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000719 unsigned int i, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Eric Dumazet645ca702008-10-29 01:41:45 -0700721 spin_lock(&hslot->lock);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800722 sk = sk_nulls_head(&hslot->head);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800723 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700724 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000725 while (sk) {
726 stack[count++] = sk;
727 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
728 uh->source, saddr, dif);
729 if (unlikely(count == ARRAY_SIZE(stack))) {
730 if (!sk)
731 break;
732 flush_stack(stack, count, skb, ~0);
733 count = 0;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800734 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000736 /*
737 * before releasing the lock, we must take reference on sockets
738 */
739 for (i = 0; i < count; i++)
740 sock_hold(stack[i]);
741
Eric Dumazet645ca702008-10-29 01:41:45 -0700742 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000743
744 if (count) {
745 flush_stack(stack, count, skb, count - 1);
746
747 for (i = 0; i < count; i++)
748 sock_put(stack[i]);
749 } else {
750 kfree_skb(skb);
751 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800752 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753}
754
Herbert Xu759e5d02007-03-25 20:10:56 -0700755static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
756 int proto)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800757{
Herbert Xu759e5d02007-03-25 20:10:56 -0700758 int err;
759
760 UDP_SKB_CB(skb)->partial_cov = 0;
761 UDP_SKB_CB(skb)->cscov = skb->len;
762
David S. Millerdb8dac22008-03-06 16:22:02 -0800763 if (proto == IPPROTO_UDPLITE) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700764 err = udplite_checksum_init(skb, uh);
765 if (err)
766 return err;
767 }
768
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800769 if (uh->check == 0) {
770 /* RFC 2460 section 8.1 says that we SHOULD log
771 this error. Well, it is reasonable.
772 */
773 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
774 return 1;
775 }
776 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700777 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700778 skb->len, proto, skb->csum))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800779 skb->ip_summed = CHECKSUM_UNNECESSARY;
780
Herbert Xu60476372007-04-09 11:59:39 -0700781 if (!skb_csum_unnecessary(skb))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700782 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
783 &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700784 skb->len, proto, 0));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800785
Herbert Xu759e5d02007-03-25 20:10:56 -0700786 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800787}
788
Eric Dumazet645ca702008-10-29 01:41:45 -0700789int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700790 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000792 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900794 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000795 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 u32 ulen = 0;
797
798 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000799 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700801 saddr = &ipv6_hdr(skb)->saddr;
802 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300803 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800806 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 goto short_packet;
808
Herbert Xu759e5d02007-03-25 20:10:56 -0700809 if (proto == IPPROTO_UDP) {
810 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800812 /* Check for jumbo payload */
813 if (ulen == 0)
814 ulen = skb->len;
815
816 if (ulen < sizeof(*uh))
817 goto short_packet;
818
819 if (ulen < skb->len) {
820 if (pskb_trim_rcsum(skb, ulen))
821 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700822 saddr = &ipv6_hdr(skb)->saddr;
823 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300824 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800825 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 }
827
Herbert Xu759e5d02007-03-25 20:10:56 -0700828 if (udp6_csum_init(skb, uh, proto))
829 goto discard;
830
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900831 /*
832 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800834 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700835 return __udp6_lib_mcast_deliver(net, skb,
836 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
838 /* Unicast */
839
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900840 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 * check socket cache ... must talk to Alan about his plans
842 * for sock caches... i'll skip this for now.
843 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700844 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000845 if (sk != NULL) {
846 int ret = udpv6_queue_rcv_skb(sk, skb);
847 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000849 /* a return value > 0 means to resubmit the input, but
850 * it wants the return to be -protocol, or 0
851 */
852 if (ret > 0)
853 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800855 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900857
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000858 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
859 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900860
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000861 if (udp_lib_checksum_complete(skb))
Eric Dumazetc3774112010-04-27 15:13:20 -0700862 goto discard;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000863
864 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
865 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
866
867 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800868 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900870short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000871 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
David S. Millerdb8dac22008-03-06 16:22:02 -0800872 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000873 saddr,
874 ntohs(uh->source),
875 ulen,
876 skb->len,
877 daddr,
878 ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700881 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800883 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800885
Herbert Xue5bbef22007-10-15 12:50:28 -0700886static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800887{
Eric Dumazet645ca702008-10-29 01:41:45 -0700888 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800889}
890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891/*
892 * Throw away all pending data and cancel the corking. Socket is locked.
893 */
894static void udp_v6_flush_pending_frames(struct sock *sk)
895{
896 struct udp_sock *up = udp_sk(sk);
897
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400898 if (up->pending == AF_INET)
899 udp_flush_pending_frames(sk);
900 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 up->len = 0;
902 up->pending = 0;
903 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900904 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000907/**
908 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
909 * @sk: socket we are sending on
910 * @skb: sk_buff containing the filled-in UDP header
911 * (checksum field must be zeroed out)
912 */
913static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
914 const struct in6_addr *saddr,
915 const struct in6_addr *daddr, int len)
916{
917 unsigned int offset;
918 struct udphdr *uh = udp_hdr(skb);
919 __wsum csum = 0;
920
921 if (skb_queue_len(&sk->sk_write_queue) == 1) {
922 /* Only one fragment on the socket. */
923 skb->csum_start = skb_transport_header(skb) - skb->head;
924 skb->csum_offset = offsetof(struct udphdr, check);
925 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
926 } else {
927 /*
928 * HW-checksum won't work as there are two or more
929 * fragments on the socket so that all csums of sk_buffs
930 * should be together
931 */
932 offset = skb_transport_offset(skb);
933 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
934
935 skb->ip_summed = CHECKSUM_NONE;
936
937 skb_queue_walk(&sk->sk_write_queue, skb) {
938 csum = csum_add(csum, skb->csum);
939 }
940
941 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
942 csum);
943 if (uh->check == 0)
944 uh->check = CSUM_MANGLED_0;
945 }
946}
947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948/*
949 * Sending
950 */
951
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800952static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953{
954 struct sk_buff *skb;
955 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800956 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 struct inet_sock *inet = inet_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500958 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100960 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800961 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
963 /* Grab the skbuff where UDP header space exists. */
964 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
965 goto out;
966
967 /*
968 * Create a UDP header
969 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300970 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -0500971 uh->source = fl6->fl6_sport;
972 uh->dest = fl6->fl6_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 uh->len = htons(up->len);
974 uh->check = 0;
975
Wang Chenb2bf1e22007-12-03 22:34:16 +1100976 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800977 csum = udplite_csum_outgoing(sk, skb);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000978 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
David S. Miller4c9483b2011-03-12 16:22:43 -0500979 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000980 up->len);
981 goto send;
982 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800983 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800985 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -0500986 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
987 up->len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800989 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000991send:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -0700993 if (err) {
994 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
995 UDP6_INC_STATS_USER(sock_net(sk),
996 UDP_MIB_SNDBUFERRORS, is_udplite);
997 err = 0;
998 }
999 } else
1000 UDP6_INC_STATS_USER(sock_net(sk),
1001 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002out:
1003 up->len = 0;
1004 up->pending = 0;
1005 return err;
1006}
1007
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001008int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 struct msghdr *msg, size_t len)
1010{
1011 struct ipv6_txoptions opt_space;
1012 struct udp_sock *up = udp_sk(sk);
1013 struct inet_sock *inet = inet_sk(sk);
1014 struct ipv6_pinfo *np = inet6_sk(sk);
1015 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001016 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 struct ipv6_txoptions *opt = NULL;
1018 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001019 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 struct dst_entry *dst;
1021 int addr_len = msg->msg_namelen;
1022 int ulen = len;
1023 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001024 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001025 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1027 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001028 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001029 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001030 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
1032 /* destination address check */
1033 if (sin6) {
1034 if (addr_len < offsetof(struct sockaddr, sa_data))
1035 return -EINVAL;
1036
1037 switch (sin6->sin6_family) {
1038 case AF_INET6:
1039 if (addr_len < SIN6_LEN_RFC2133)
1040 return -EINVAL;
1041 daddr = &sin6->sin6_addr;
1042 break;
1043 case AF_INET:
1044 goto do_udp_sendmsg;
1045 case AF_UNSPEC:
1046 msg->msg_name = sin6 = NULL;
1047 msg->msg_namelen = addr_len = 0;
1048 daddr = NULL;
1049 break;
1050 default:
1051 return -EINVAL;
1052 }
1053 } else if (!up->pending) {
1054 if (sk->sk_state != TCP_ESTABLISHED)
1055 return -EDESTADDRREQ;
1056 daddr = &np->daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001057 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 daddr = NULL;
1059
1060 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001061 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 struct sockaddr_in sin;
1063 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001064 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1066 msg->msg_name = &sin;
1067 msg->msg_namelen = sizeof(sin);
1068do_udp_sendmsg:
1069 if (__ipv6_only_sock(sk))
1070 return -ENETUNREACH;
1071 return udp_sendmsg(iocb, sk, msg, len);
1072 }
1073 }
1074
1075 if (up->pending == AF_INET)
1076 return udp_sendmsg(iocb, sk, msg, len);
1077
1078 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001079 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 */
1081 if (len > INT_MAX - sizeof(struct udphdr))
1082 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 if (up->pending) {
1085 /*
1086 * There are pending frames.
1087 * The socket lock must be held while it's corked.
1088 */
1089 lock_sock(sk);
1090 if (likely(up->pending)) {
1091 if (unlikely(up->pending != AF_INET6)) {
1092 release_sock(sk);
1093 return -EAFNOSUPPORT;
1094 }
1095 dst = NULL;
1096 goto do_append_data;
1097 }
1098 release_sock(sk);
1099 }
1100 ulen += sizeof(struct udphdr);
1101
David S. Miller4c9483b2011-03-12 16:22:43 -05001102 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
1104 if (sin6) {
1105 if (sin6->sin6_port == 0)
1106 return -EINVAL;
1107
David S. Miller1958b852011-03-12 16:36:19 -05001108 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 daddr = &sin6->sin6_addr;
1110
1111 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001112 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1113 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1114 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 if (flowlabel == NULL)
1116 return -EINVAL;
1117 daddr = &flowlabel->dst;
1118 }
1119 }
1120
1121 /*
1122 * Otherwise it will be difficult to maintain
1123 * sk->sk_dst_cache.
1124 */
1125 if (sk->sk_state == TCP_ESTABLISHED &&
1126 ipv6_addr_equal(daddr, &np->daddr))
1127 daddr = &np->daddr;
1128
1129 if (addr_len >= sizeof(struct sockaddr_in6) &&
1130 sin6->sin6_scope_id &&
1131 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
David S. Miller4c9483b2011-03-12 16:22:43 -05001132 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 } else {
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 return -EDESTADDRREQ;
1136
David S. Miller1958b852011-03-12 16:36:19 -05001137 fl6.fl6_dport = inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 daddr = &np->daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001139 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001140 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 }
1142
David S. Miller4c9483b2011-03-12 16:22:43 -05001143 if (!fl6.flowi6_oif)
1144 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
David S. Miller4c9483b2011-03-12 16:22:43 -05001146 if (!fl6.flowi6_oif)
1147 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001148
David S. Miller4c9483b2011-03-12 16:22:43 -05001149 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001150
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 if (msg->msg_controllen) {
1152 opt = &opt_space;
1153 memset(opt, 0, sizeof(struct ipv6_txoptions));
1154 opt->tot_len = sizeof(*opt);
1155
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +00001156 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1157 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 if (err < 0) {
1159 fl6_sock_release(flowlabel);
1160 return err;
1161 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001162 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1163 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 if (flowlabel == NULL)
1165 return -EINVAL;
1166 }
1167 if (!(opt->opt_nflen|opt->opt_flen))
1168 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001169 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 }
1171 if (opt == NULL)
1172 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001173 if (flowlabel)
1174 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1175 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
David S. Miller4c9483b2011-03-12 16:22:43 -05001177 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001178 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001179 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001180 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001181 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1182 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001183 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001184 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001185
David S. Miller4c9483b2011-03-12 16:22:43 -05001186 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001187 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001188 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
David S. Miller4c9483b2011-03-12 16:22:43 -05001190 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1191 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001192 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001193 } else if (!fl6.flowi6_oif)
1194 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
David S. Miller4c9483b2011-03-12 16:22:43 -05001196 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001197
David S. Miller4c9483b2011-03-12 16:22:43 -05001198 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001199 if (IS_ERR(dst)) {
1200 err = PTR_ERR(dst);
1201 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
1205 if (hlimit < 0) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001206 if (ipv6_addr_is_multicast(&fl6.daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 hlimit = np->mcast_hops;
1208 else
1209 hlimit = np->hop_limit;
1210 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001211 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 }
1213
Gerrit Renkere651f032009-08-09 08:12:48 +00001214 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001215 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001216
Brian Haley13b52cd2010-04-23 11:26:08 +00001217 if (dontfrag < 0)
1218 dontfrag = np->dontfrag;
1219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 if (msg->msg_flags&MSG_CONFIRM)
1221 goto do_confirm;
1222back_from_confirm:
1223
1224 lock_sock(sk);
1225 if (unlikely(up->pending)) {
1226 /* The socket is already corked while preparing it. */
1227 /* ... which is an evident application bug. --ANK */
1228 release_sock(sk);
1229
Patrick McHardy64ce2072005-08-09 20:50:53 -07001230 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 err = -EINVAL;
1232 goto out;
1233 }
1234
1235 up->pending = AF_INET6;
1236
1237do_append_data:
1238 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001239 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1240 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001241 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001242 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001243 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 if (err)
1245 udp_v6_flush_pending_frames(sk);
1246 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001247 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001248 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1249 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250
David S. Millera5e7c212005-10-03 14:21:58 -07001251 if (dst) {
1252 if (connected) {
1253 ip6_dst_store(sk, dst,
David S. Miller4c9483b2011-03-12 16:22:43 -05001254 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001255 &np->daddr : NULL,
1256#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001257 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001258 &np->saddr :
1259#endif
1260 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001261 } else {
1262 dst_release(dst);
1263 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001264 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001265 }
1266
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 if (err > 0)
1268 err = np->recverr ? net_xmit_errno(err) : 0;
1269 release_sock(sk);
1270out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001271 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001273 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001275 /*
1276 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1277 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1278 * we don't have a good statistic (IpOutDiscards but it can be too many
1279 * things). We could add another new stat but at least for now that
1280 * seems like overkill.
1281 */
1282 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001283 UDP6_INC_STATS_USER(sock_net(sk),
1284 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001285 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 return err;
1287
1288do_confirm:
1289 dst_confirm(dst);
1290 if (!(msg->msg_flags&MSG_PROBE) || len)
1291 goto back_from_confirm;
1292 err = 0;
1293 goto out;
1294}
1295
Brian Haley7d06b2e2008-06-14 17:04:49 -07001296void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297{
1298 lock_sock(sk);
1299 udp_v6_flush_pending_frames(sk);
1300 release_sock(sk);
1301
1302 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303}
1304
1305/*
1306 * Socket option code for UDP
1307 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001308int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001309 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001310{
David S. Millerdb8dac22008-03-06 16:22:02 -08001311 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001312 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1313 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001314 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001315}
1316
1317#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001318int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001319 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001320{
David S. Millerdb8dac22008-03-06 16:22:02 -08001321 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001322 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1323 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001324 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001325}
1326#endif
1327
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001328int udpv6_getsockopt(struct sock *sk, int level, int optname,
1329 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001330{
David S. Millerdb8dac22008-03-06 16:22:02 -08001331 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001332 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001333 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001334}
1335
1336#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001337int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1338 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001339{
David S. Millerdb8dac22008-03-06 16:22:02 -08001340 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001341 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001342 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001343}
1344#endif
1345
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001346static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 .handler = udpv6_rcv,
1348 .err_handler = udpv6_err,
1349 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1350};
1351
1352/* ------------------------------------------------------------------------ */
1353#ifdef CONFIG_PROC_FS
1354
1355static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1356{
1357 struct inet_sock *inet = inet_sk(sp);
1358 struct ipv6_pinfo *np = inet6_sk(sp);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001359 const struct in6_addr *dest, *src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 __u16 destp, srcp;
1361
1362 dest = &np->daddr;
1363 src = &np->rcv_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001364 destp = ntohs(inet->inet_dport);
1365 srcp = ntohs(inet->inet_sport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 seq_printf(seq,
Eric Dumazetf86dcc52009-10-07 00:37:59 +00001367 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
Dan Rosenberg71338aa2011-05-23 12:17:35 +00001368 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 bucket,
1370 src->s6_addr32[0], src->s6_addr32[1],
1371 src->s6_addr32[2], src->s6_addr32[3], srcp,
1372 dest->s6_addr32[0], dest->s6_addr32[1],
1373 dest->s6_addr32[2], dest->s6_addr32[3], destp,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001374 sp->sk_state,
Eric Dumazet31e6d362009-06-17 19:05:41 -07001375 sk_wmem_alloc_get(sp),
1376 sk_rmem_alloc_get(sp),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 0, 0L, 0,
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001378 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1379 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 sock_i_ino(sp),
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001381 atomic_read(&sp->sk_refcnt), sp,
1382 atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383}
1384
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001385int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386{
1387 if (v == SEQ_START_TOKEN)
1388 seq_printf(seq,
1389 " sl "
1390 "local_address "
1391 "remote_address "
1392 "st tx_queue rx_queue tr tm->when retrnsmt"
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001393 " uid timeout inode ref pointer drops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 else
1395 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1396 return 0;
1397}
1398
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001399static const struct file_operations udp6_afinfo_seq_fops = {
1400 .owner = THIS_MODULE,
1401 .open = udp_seq_open,
1402 .read = seq_read,
1403 .llseek = seq_lseek,
1404 .release = seq_release_net
1405};
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 .name = "udp6",
1409 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001410 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001411 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001412 .seq_ops = {
1413 .show = udp6_seq_show,
1414 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415};
1416
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001417int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001419 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420}
1421
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001422void udp6_proc_exit(struct net *net) {
1423 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424}
1425#endif /* CONFIG_PROC_FS */
1426
1427/* ------------------------------------------------------------------------ */
1428
1429struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001430 .name = "UDPv6",
1431 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001432 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001433 .connect = ip6_datagram_connect,
1434 .disconnect = udp_disconnect,
1435 .ioctl = udp_ioctl,
1436 .destroy = udpv6_destroy_sock,
1437 .setsockopt = udpv6_setsockopt,
1438 .getsockopt = udpv6_getsockopt,
1439 .sendmsg = udpv6_sendmsg,
1440 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001441 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001442 .hash = udp_lib_hash,
1443 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001444 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001445 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001446 .memory_allocated = &udp_memory_allocated,
1447 .sysctl_mem = sysctl_udp_mem,
1448 .sysctl_wmem = &sysctl_udp_wmem_min,
1449 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001450 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001451 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001452 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001453#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001454 .compat_setsockopt = compat_udpv6_setsockopt,
1455 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001456#endif
Octavian Purdilafcbdf092010-12-16 14:26:56 -08001457 .clear_sk = sk_prot_clear_portaddr_nulls,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458};
1459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460static struct inet_protosw udpv6_protosw = {
1461 .type = SOCK_DGRAM,
1462 .protocol = IPPROTO_UDP,
1463 .prot = &udpv6_prot,
1464 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 .no_check = UDP_CSUM_DEFAULT,
1466 .flags = INET_PROTOSW_PERMANENT,
1467};
1468
1469
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001470int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001472 int ret;
1473
Vlad Yasevich33362882012-11-15 08:49:15 +00001474 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1475 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001476 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001477
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001478 ret = inet6_register_protosw(&udpv6_protosw);
1479 if (ret)
1480 goto out_udpv6_protocol;
1481out:
1482 return ret;
1483
1484out_udpv6_protocol:
1485 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1486 goto out;
1487}
1488
Daniel Lezcano09f77092007-12-13 05:34:58 -08001489void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001490{
1491 inet6_unregister_protosw(&udpv6_protosw);
1492 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493}