blob: 5b6091de5868493c9beb6a160877a18e86ecf755 [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>
Tom Herbert72289b92013-01-22 09:50:44 +000048#include <net/inet6_hashtables.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +030049#include <net/busy_poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51#include <linux/proc_fs.h>
52#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000053#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080054#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020056static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
61{
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020062 static u32 udp6_ehash_secret __read_mostly;
63 static u32 udp_ipv6_hash_secret __read_mostly;
64
65 u32 lhash, fhash;
66
67 net_get_random_once(&udp6_ehash_secret,
68 sizeof(udp6_ehash_secret));
69 net_get_random_once(&udp_ipv6_hash_secret,
70 sizeof(udp_ipv6_hash_secret));
71
72 lhash = (__force u32)laddr->s6_addr32[3];
73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
74
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020075 return __inet6_ehashfn(lhash, lport, fhash, fport,
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020076 udp_ipv6_hash_secret + net_hash_mix(net));
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020077}
78
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000079int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
80{
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000081 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000082 int sk2_ipv6only = inet_v6_ipv6only(sk2);
Eric Dumazetefe42082013-10-03 15:42:29 -070083 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000084 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
85
86 /* if both are mapped, treat as IPv4 */
87 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
Vlad Yasevich499923c2009-04-09 17:37:33 +000088 return (!sk2_ipv6only &&
Eric Dumazet50805462013-10-02 04:29:50 -070089 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
90 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000091
92 if (addr_type2 == IPV6_ADDR_ANY &&
93 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
94 return 1;
95
96 if (addr_type == IPV6_ADDR_ANY &&
Eric Dumazet9fe516b2014-06-27 08:36:16 -070097 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000098 return 1;
99
100 if (sk2_rcv_saddr6 &&
Eric Dumazetefe42082013-10-03 15:42:29 -0700101 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000102 return 1;
103
104 return 0;
105}
106
Eric Dumazetd4cada42009-11-08 10:17:30 +0000107static unsigned int udp6_portaddr_hash(struct net *net,
108 const struct in6_addr *addr6,
109 unsigned int port)
110{
111 unsigned int hash, mix = net_hash_mix(net);
112
113 if (ipv6_addr_any(addr6))
114 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +0000115 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700116 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000117 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700118 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000119
120 return hash ^ port;
121}
122
123
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700124int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Eric Dumazet30fff922009-11-09 05:26:33 +0000126 unsigned int hash2_nulladdr =
127 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000128 unsigned int hash2_partial =
Eric Dumazetefe42082013-10-03 15:42:29 -0700129 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
Eric Dumazet30fff922009-11-09 05:26:33 +0000130
Eric Dumazetd4cada42009-11-08 10:17:30 +0000131 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000132 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
133 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
Eric Dumazet719f8352010-09-08 05:08:44 +0000136static void udp_v6_rehash(struct sock *sk)
137{
138 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
Eric Dumazetefe42082013-10-03 15:42:29 -0700139 &sk->sk_v6_rcv_saddr,
Eric Dumazet719f8352010-09-08 05:08:44 +0000140 inet_sk(sk)->inet_num);
141
142 udp_lib_rehash(sk, new_hash);
143}
144
Eric Dumazet645ca702008-10-29 01:41:45 -0700145static inline int compute_score(struct sock *sk, struct net *net,
146 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200147 const struct in6_addr *saddr, __be16 sport,
148 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700149 int dif)
150{
151 int score = -1;
152
Eric Dumazetd4cada42009-11-08 10:17:30 +0000153 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
Eric Dumazet645ca702008-10-29 01:41:45 -0700154 sk->sk_family == PF_INET6) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700155 struct inet_sock *inet = inet_sk(sk);
156
157 score = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000158 if (inet->inet_dport) {
159 if (inet->inet_dport != sport)
Eric Dumazet645ca702008-10-29 01:41:45 -0700160 return -1;
161 score++;
162 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700163 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
164 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
Eric Dumazet645ca702008-10-29 01:41:45 -0700165 return -1;
166 score++;
167 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700168 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
169 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
Eric Dumazet645ca702008-10-29 01:41:45 -0700170 return -1;
171 score++;
172 }
173 if (sk->sk_bound_dev_if) {
174 if (sk->sk_bound_dev_if != dif)
175 return -1;
176 score++;
177 }
178 }
179 return score;
180}
181
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000182#define SCORE2_MAX (1 + 1 + 1)
183static inline int compute_score2(struct sock *sk, struct net *net,
184 const struct in6_addr *saddr, __be16 sport,
185 const struct in6_addr *daddr, unsigned short hnum,
186 int dif)
187{
188 int score = -1;
189
190 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
191 sk->sk_family == PF_INET6) {
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000192 struct inet_sock *inet = inet_sk(sk);
193
Eric Dumazetefe42082013-10-03 15:42:29 -0700194 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000195 return -1;
196 score = 0;
197 if (inet->inet_dport) {
198 if (inet->inet_dport != sport)
199 return -1;
200 score++;
201 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700202 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
203 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000204 return -1;
205 score++;
206 }
207 if (sk->sk_bound_dev_if) {
208 if (sk->sk_bound_dev_if != dif)
209 return -1;
210 score++;
211 }
212 }
213 return score;
214}
215
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000216
217/* called with read_rcu_lock() */
218static struct sock *udp6_lib_lookup2(struct net *net,
219 const struct in6_addr *saddr, __be16 sport,
220 const struct in6_addr *daddr, unsigned int hnum, int dif,
221 struct udp_hslot *hslot2, unsigned int slot2)
222{
223 struct sock *sk, *result;
224 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000225 int score, badness, matches = 0, reuseport = 0;
226 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000227
228begin:
229 result = NULL;
230 badness = -1;
231 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
232 score = compute_score2(sk, net, saddr, sport,
233 daddr, hnum, dif);
234 if (score > badness) {
235 result = sk;
236 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000237 reuseport = sk->sk_reuseport;
238 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200239 hash = udp6_ehashfn(net, daddr, hnum,
240 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000241 matches = 1;
242 } else if (score == SCORE2_MAX)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000243 goto exact_match;
Tom Herbert72289b92013-01-22 09:50:44 +0000244 } else if (score == badness && reuseport) {
245 matches++;
246 if (((u64)hash * matches) >> 32 == 0)
247 result = sk;
248 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000249 }
250 }
251 /*
252 * if the nulls value we got at the end of this lookup is
253 * not the expected one, we must restart lookup.
254 * We probably met an item that was moved to another chain.
255 */
256 if (get_nulls_value(node) != slot2)
257 goto begin;
258
259 if (result) {
260exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000261 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000262 result = NULL;
263 else if (unlikely(compute_score2(result, net, saddr, sport,
264 daddr, hnum, dif) < badness)) {
265 sock_put(result);
266 goto begin;
267 }
268 }
269 return result;
270}
271
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000272struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200273 const struct in6_addr *saddr, __be16 sport,
274 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700275 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700277 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800278 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000280 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
281 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000282 int score, badness, matches = 0, reuseport = 0;
283 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Eric Dumazet271b72c2008-10-29 02:11:14 -0700285 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000286 if (hslot->count > 10) {
287 hash2 = udp6_portaddr_hash(net, daddr, hnum);
288 slot2 = hash2 & udptable->mask;
289 hslot2 = &udptable->hash2[slot2];
290 if (hslot->count < hslot2->count)
291 goto begin;
292
293 result = udp6_lib_lookup2(net, saddr, sport,
294 daddr, hnum, dif,
295 hslot2, slot2);
296 if (!result) {
297 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
298 slot2 = hash2 & udptable->mask;
299 hslot2 = &udptable->hash2[slot2];
300 if (hslot->count < hslot2->count)
301 goto begin;
302
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000303 result = udp6_lib_lookup2(net, saddr, sport,
304 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000305 hslot2, slot2);
306 }
307 rcu_read_unlock();
308 return result;
309 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700310begin:
311 result = NULL;
312 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800313 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700314 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
315 if (score > badness) {
316 result = sk;
317 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000318 reuseport = sk->sk_reuseport;
319 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200320 hash = udp6_ehashfn(net, daddr, hnum,
321 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000322 matches = 1;
323 }
324 } else if (score == badness && reuseport) {
325 matches++;
326 if (((u64)hash * matches) >> 32 == 0)
327 result = sk;
328 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 }
330 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800331 /*
332 * if the nulls value we got at the end of this lookup is
333 * not the expected one, we must restart lookup.
334 * We probably met an item that was moved to another chain.
335 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000336 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800337 goto begin;
338
Eric Dumazet271b72c2008-10-29 02:11:14 -0700339 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000340 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700341 result = NULL;
342 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
343 daddr, dport, dif) < badness)) {
344 sock_put(result);
345 goto begin;
346 }
347 }
348 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 return result;
350}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000351EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700353static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
354 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700355 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700356{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700357 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000358 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700359
KOVACS Krisztian23542612008-10-07 12:41:01 -0700360 if (unlikely(sk = skb_steal_sock(skb)))
361 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000362 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
363 &iph->daddr, dport, inet6_iif(skb),
364 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700365}
366
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200367struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
368 const struct in6_addr *daddr, __be16 dport, int dif)
369{
370 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
371}
372EXPORT_SYMBOL_GPL(udp6_lib_lookup);
373
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 * This should be easy, if there is something there we
377 * return it, otherwise we block.
378 */
379
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800380int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 struct msghdr *msg, size_t len,
382 int noblock, int flags, int *addr_len)
383{
384 struct ipv6_pinfo *np = inet6_sk(sk);
385 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900386 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500387 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000388 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700389 int err;
390 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000391 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000392 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100395 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Brian Haley4b340ae2010-04-23 11:26:09 +0000397 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100398 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800401 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000402 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 if (!skb)
404 goto out;
405
Herbert Xu759e5d02007-03-25 20:10:56 -0700406 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500407 copied = len;
408 if (copied > ulen)
409 copied = ulen;
410 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900411 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Wei Yongjunf26ba172008-11-02 16:11:01 +0000413 is_udp4 = (skb->protocol == htons(ETH_P_IP));
414
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800415 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700416 * If checksum is needed at all, try to do it while copying the
417 * data. If the data is truncated, or if we only want a partial
418 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800419 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800420
David S. Miller59c2cda2011-12-01 14:12:55 -0500421 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700422 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800424 }
425
Herbert Xu60476372007-04-09 11:59:39 -0700426 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800427 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
Eric Dumazet22911fc2012-06-27 00:23:44 +0000428 msg->msg_iov, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800429 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
431 if (err == -EINVAL)
432 goto csum_copy_err;
433 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000434 if (unlikely(err)) {
435 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000436 if (!peeked) {
437 atomic_inc(&sk->sk_drops);
438 if (is_udp4)
439 UDP_INC_STATS_USER(sock_net(sk),
440 UDP_MIB_INERRORS,
441 is_udplite);
442 else
443 UDP6_INC_STATS_USER(sock_net(sk),
444 UDP_MIB_INERRORS,
445 is_udplite);
446 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000448 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000449 if (!peeked) {
450 if (is_udp4)
451 UDP_INC_STATS_USER(sock_net(sk),
452 UDP_MIB_INDATAGRAMS, is_udplite);
453 else
454 UDP6_INC_STATS_USER(sock_net(sk),
455 UDP_MIB_INDATAGRAMS, is_udplite);
456 }
Wang Chencb759942007-12-03 22:33:28 +1100457
Neil Horman3b885782009-10-12 13:26:31 -0700458 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 /* Copy the address. */
461 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100462 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300464 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000467 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700468 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
469 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000470 sin6->sin6_scope_id = 0;
471 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000472 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000473 sin6->sin6_scope_id =
474 ipv6_iface_scope_id(&sin6->sin6_addr,
475 IP6CB(skb)->iif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100477 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100479
480 if (np->rxopt.all)
481 ip6_datagram_recv_common_ctl(sk, msg, skb);
482
Wei Yongjunf26ba172008-11-02 16:11:01 +0000483 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (inet->cmsg_flags)
485 ip_cmsg_recv(msg, skb);
486 } else {
487 if (np->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100488 ip6_datagram_recv_specific_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
David S. Miller59c2cda2011-12-01 14:12:55 -0500491 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700493 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000496 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497out:
498 return err;
499
500csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000501 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000502 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000503 if (is_udp4) {
504 UDP_INC_STATS_USER(sock_net(sk),
505 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000506 UDP_INC_STATS_USER(sock_net(sk),
507 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000508 } else {
509 UDP6_INC_STATS_USER(sock_net(sk),
510 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000511 UDP6_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000513 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000514 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000515 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Xufeng Zhang32c90252011-06-21 10:43:39 +0000517 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000519
520 /* starting over for a new packet */
521 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 goto try_again;
523}
524
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800525void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700526 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700527 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
529 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000530 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
531 const struct in6_addr *saddr = &hdr->saddr;
532 const struct in6_addr *daddr = &hdr->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
534 struct sock *sk;
535 int err;
536
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900537 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800538 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (sk == NULL)
540 return;
541
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100542 if (type == ICMPV6_PKT_TOOBIG) {
543 if (!ip6_sk_accept_pmtu(sk))
544 goto out;
David S. Miller81aded22012-06-15 14:54:11 -0700545 ip6_sk_update_pmtu(skb, sk, info);
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100546 }
Duan Jiong1a462d12013-09-20 18:20:28 +0800547 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700548 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800549 goto out;
550 }
David S. Miller81aded22012-06-15 14:54:11 -0700551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 np = inet6_sk(sk);
553
554 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
555 goto out;
556
557 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
558 goto out;
559
Eric Dumazetb1faf562010-05-31 23:44:05 -0700560 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 sk->sk_err = err;
564 sk->sk_error_report(sk);
565out:
566 sock_put(sk);
567}
568
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000569static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
570{
571 int rc;
572
Eric Dumazetefe42082013-10-03 15:42:29 -0700573 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000574 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500575 sk_mark_napi_id(sk, skb);
576 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000577
578 rc = sock_queue_rcv_skb(sk, skb);
579 if (rc < 0) {
580 int is_udplite = IS_UDPLITE(sk);
581
582 /* Note that an ENOMEM error is charged twice */
583 if (rc == -ENOMEM)
584 UDP6_INC_STATS_BH(sock_net(sk),
585 UDP_MIB_RCVBUFERRORS, is_udplite);
586 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
587 kfree_skb(skb);
588 return -1;
589 }
590 return 0;
591}
592
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800593static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700594 struct inet6_skb_parm *opt, u8 type,
595 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
Eric Dumazet645ca702008-10-29 01:41:45 -0700597 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800598}
599
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000600static struct static_key udpv6_encap_needed __read_mostly;
601void udpv6_encap_enable(void)
602{
603 if (!static_key_enabled(&udpv6_encap_needed))
604 static_key_slow_inc(&udpv6_encap_needed);
605}
606EXPORT_SYMBOL(udpv6_encap_enable);
607
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000608int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800609{
610 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700611 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100612 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700613
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800614 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
615 goto drop;
616
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000617 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
618 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
619
620 /*
621 * This is an encapsulation socket so pass the skb to
622 * the socket's udp_encap_rcv() hook. Otherwise, just
623 * fall through and pass this up the UDP socket.
624 * up->encap_rcv() returns the following value:
625 * =0 if skb was successfully passed to the encap
626 * handler or was discarded by it.
627 * >0 if skb should be passed on to UDP.
628 * <0 if skb should be resubmitted as proto -N
629 */
630
631 /* if we're overly short, let UDP handle it */
632 encap_rcv = ACCESS_ONCE(up->encap_rcv);
633 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
634 int ret;
635
Tom Herbert0a809662014-05-07 16:52:39 -0700636 /* Verify checksum before giving to encap */
637 if (udp_lib_checksum_complete(skb))
638 goto csum_error;
639
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000640 ret = encap_rcv(sk, skb);
641 if (ret <= 0) {
642 UDP_INC_STATS_BH(sock_net(sk),
643 UDP_MIB_INDATAGRAMS,
644 is_udplite);
645 return -ret;
646 }
647 }
648
649 /* FALLTHROUGH -- it's a UDP Packet */
650 }
651
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800652 /*
653 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
654 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100655 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800656
657 if (up->pcrlen == 0) { /* full coverage was set */
658 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
659 " %d while full coverage %d requested\n",
660 UDP_SKB_CB(skb)->cscov, skb->len);
661 goto drop;
662 }
663 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
664 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
665 "too small, need min %d\n",
666 UDP_SKB_CB(skb)->cscov, up->pcrlen);
667 goto drop;
668 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 }
670
Eric Dumazet33d480c2011-08-11 19:30:52 +0000671 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800672 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000673 goto csum_error;
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Sorin Dumitru274f4822014-07-22 21:16:51 +0300676 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
James M Leddy3e215c82014-06-25 17:38:13 -0400677 UDP6_INC_STATS_BH(sock_net(sk),
678 UDP_MIB_RCVBUFERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000679 goto drop;
James M Leddy3e215c82014-06-25 17:38:13 -0400680 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000681
Eric Dumazetd826eb12011-11-09 07:24:35 +0000682 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100683
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000684 bh_lock_sock(sk);
685 rc = 0;
686 if (!sock_owned_by_user(sk))
687 rc = __udpv6_queue_rcv_skb(sk, skb);
688 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
689 bh_unlock_sock(sk);
690 goto drop;
691 }
692 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000693
694 return rc;
James M Leddy3e215c82014-06-25 17:38:13 -0400695
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000696csum_error:
697 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800698drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700699 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000700 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800701 kfree_skb(skb);
702 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703}
704
David Held5cf3d462014-07-15 23:28:31 -0400705static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
706 __be16 loc_port, const struct in6_addr *loc_addr,
707 __be16 rmt_port, const struct in6_addr *rmt_addr,
708 int dif, unsigned short hnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
David Held5cf3d462014-07-15 23:28:31 -0400710 struct inet_sock *inet = inet_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
David Held5cf3d462014-07-15 23:28:31 -0400712 if (!net_eq(sock_net(sk), net))
713 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
David Held5cf3d462014-07-15 23:28:31 -0400715 if (udp_sk(sk)->udp_port_hash != hnum ||
716 sk->sk_family != PF_INET6 ||
717 (inet->inet_dport && inet->inet_dport != rmt_port) ||
718 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
719 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
720 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
721 return false;
722 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
723 return false;
724 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725}
726
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000727static void flush_stack(struct sock **stack, unsigned int count,
728 struct sk_buff *skb, unsigned int final)
729{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000730 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000731 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000732 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000733
734 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000735 sk = stack[i];
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000736 if (likely(skb1 == NULL))
737 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
738 if (!skb1) {
739 atomic_inc(&sk->sk_drops);
740 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
741 IS_UDPLITE(sk));
742 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
743 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000744 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000745
746 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
747 skb1 = NULL;
David Held2dc41cf2014-07-15 23:28:32 -0400748 sock_put(sk);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000749 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000750 if (unlikely(skb1))
751 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000752}
Tom Herbert40685792014-05-02 16:29:58 -0700753
754static void udp6_csum_zero_error(struct sk_buff *skb)
755{
756 /* RFC 2460 section 8.1 says that we SHOULD log
757 * this error. Well, it is reasonable.
758 */
759 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
760 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
761 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
762}
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764/*
765 * Note: called only from the BH handler context,
766 * so we don't need to lock the hashes.
767 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700768static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000769 const struct in6_addr *saddr, const struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700770 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000772 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300773 const struct udphdr *uh = udp_hdr(skb);
David Held5cf3d462014-07-15 23:28:31 -0400774 struct hlist_nulls_node *node;
775 unsigned short hnum = ntohs(uh->dest);
776 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
777 int dif = inet6_iif(skb);
David Held2dc41cf2014-07-15 23:28:32 -0400778 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
779 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
780
781 if (use_hash2) {
782 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
783 udp_table.mask;
784 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
785start_lookup:
786 hslot = &udp_table.hash2[hash2];
787 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
788 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Eric Dumazet645ca702008-10-29 01:41:45 -0700790 spin_lock(&hslot->lock);
David Held2dc41cf2014-07-15 23:28:32 -0400791 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
David Held5cf3d462014-07-15 23:28:31 -0400792 if (__udp_v6_is_mcast_sock(net, sk,
793 uh->dest, daddr,
794 uh->source, saddr,
795 dif, hnum) &&
796 /* If zero checksum and no_check is not on for
797 * the socket then skip it.
798 */
799 (uh->check || udp_sk(sk)->no_check6_rx)) {
800 if (unlikely(count == ARRAY_SIZE(stack))) {
801 flush_stack(stack, count, skb, ~0);
802 count = 0;
803 }
Tom Herbert40685792014-05-02 16:29:58 -0700804 stack[count++] = sk;
David Held2dc41cf2014-07-15 23:28:32 -0400805 sock_hold(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800806 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000808
Eric Dumazet645ca702008-10-29 01:41:45 -0700809 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000810
David Held2dc41cf2014-07-15 23:28:32 -0400811 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
812 if (use_hash2 && hash2 != hash2_any) {
813 hash2 = hash2_any;
814 goto start_lookup;
815 }
816
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000817 if (count) {
818 flush_stack(stack, count, skb, count - 1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000819 } else {
820 kfree_skb(skb);
821 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800822 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823}
824
Eric Dumazet645ca702008-10-29 01:41:45 -0700825int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700826 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000828 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900830 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000831 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 u32 ulen = 0;
833
834 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000835 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700837 saddr = &ipv6_hdr(skb)->saddr;
838 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300839 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
841 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800842 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 goto short_packet;
844
Herbert Xu759e5d02007-03-25 20:10:56 -0700845 if (proto == IPPROTO_UDP) {
846 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800848 /* Check for jumbo payload */
849 if (ulen == 0)
850 ulen = skb->len;
851
852 if (ulen < sizeof(*uh))
853 goto short_packet;
854
855 if (ulen < skb->len) {
856 if (pskb_trim_rcsum(skb, ulen))
857 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700858 saddr = &ipv6_hdr(skb)->saddr;
859 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300860 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800861 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 }
863
Herbert Xu759e5d02007-03-25 20:10:56 -0700864 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000865 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700866
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900867 /*
868 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800870 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700871 return __udp6_lib_mcast_deliver(net, skb,
872 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 /* Unicast */
875
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900876 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 * check socket cache ... must talk to Alan about his plans
878 * for sock caches... i'll skip this for now.
879 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700880 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000881 if (sk != NULL) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300882 int ret;
883
Tom Herbert1c194482014-05-23 08:47:32 -0700884 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
Tom Herbert79e0f1c2014-05-05 16:43:58 -0700885 sock_put(sk);
Tom Herbert40685792014-05-02 16:29:58 -0700886 udp6_csum_zero_error(skb);
887 goto csum_error;
888 }
889
Eliezer Tamira5b50472013-06-10 11:40:00 +0300890 ret = udpv6_queue_rcv_skb(sk, skb);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000891 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000893 /* a return value > 0 means to resubmit the input, but
894 * it wants the return to be -protocol, or 0
895 */
896 if (ret > 0)
897 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800899 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900901
Tom Herbert40685792014-05-02 16:29:58 -0700902 if (!uh->check) {
903 udp6_csum_zero_error(skb);
904 goto csum_error;
905 }
906
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000907 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
908 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900909
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000910 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000911 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000912
913 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
914 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
915
916 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800917 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900919short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000920 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 -0800921 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000922 saddr,
923 ntohs(uh->source),
924 ulen,
925 skb->len,
926 daddr,
927 ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000928 goto discard;
929csum_error:
930 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700932 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800934 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800936
Herbert Xue5bbef22007-10-15 12:50:28 -0700937static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800938{
Eric Dumazet645ca702008-10-29 01:41:45 -0700939 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800940}
941
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942/*
943 * Throw away all pending data and cancel the corking. Socket is locked.
944 */
945static void udp_v6_flush_pending_frames(struct sock *sk)
946{
947 struct udp_sock *up = udp_sk(sk);
948
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400949 if (up->pending == AF_INET)
950 udp_flush_pending_frames(sk);
951 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 up->len = 0;
953 up->pending = 0;
954 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900955 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956}
957
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000958/**
959 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
960 * @sk: socket we are sending on
961 * @skb: sk_buff containing the filled-in UDP header
962 * (checksum field must be zeroed out)
963 */
964static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
965 const struct in6_addr *saddr,
966 const struct in6_addr *daddr, int len)
967{
968 unsigned int offset;
969 struct udphdr *uh = udp_hdr(skb);
970 __wsum csum = 0;
971
972 if (skb_queue_len(&sk->sk_write_queue) == 1) {
973 /* Only one fragment on the socket. */
974 skb->csum_start = skb_transport_header(skb) - skb->head;
975 skb->csum_offset = offsetof(struct udphdr, check);
976 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
977 } else {
978 /*
979 * HW-checksum won't work as there are two or more
980 * fragments on the socket so that all csums of sk_buffs
981 * should be together
982 */
983 offset = skb_transport_offset(skb);
984 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
985
986 skb->ip_summed = CHECKSUM_NONE;
987
988 skb_queue_walk(&sk->sk_write_queue, skb) {
989 csum = csum_add(csum, skb->csum);
990 }
991
992 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
993 csum);
994 if (uh->check == 0)
995 uh->check = CSUM_MANGLED_0;
996 }
997}
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999/*
1000 * Sending
1001 */
1002
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001003static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
1005 struct sk_buff *skb;
1006 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001007 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 struct inet_sock *inet = inet_sk(sk);
Hannes Frederic Sowa8822b642013-07-01 20:21:30 +02001009 struct flowi6 *fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001011 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -08001012 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Hannes Frederic Sowa8822b642013-07-01 20:21:30 +02001014 if (up->pending == AF_INET)
1015 return udp_push_pending_frames(sk);
1016
1017 fl6 = &inet->cork.fl.u.ip6;
1018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 /* Grab the skbuff where UDP header space exists. */
1020 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
1021 goto out;
1022
1023 /*
1024 * Create a UDP header
1025 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001026 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -05001027 uh->source = fl6->fl6_sport;
1028 uh->dest = fl6->fl6_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 uh->len = htons(up->len);
1030 uh->check = 0;
1031
Wang Chenb2bf1e22007-12-03 22:34:16 +11001032 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001033 csum = udplite_csum_outgoing(sk, skb);
Tom Herbert1c194482014-05-23 08:47:32 -07001034 else if (up->no_check6_tx) { /* UDP csum disabled */
Tom Herbert40685792014-05-02 16:29:58 -07001035 skb->ip_summed = CHECKSUM_NONE;
1036 goto send;
1037 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
David S. Miller4c9483b2011-03-12 16:22:43 -05001038 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001039 up->len);
1040 goto send;
1041 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001042 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001044 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001045 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1046 up->len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001048 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001050send:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001052 if (err) {
1053 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1054 UDP6_INC_STATS_USER(sock_net(sk),
1055 UDP_MIB_SNDBUFERRORS, is_udplite);
1056 err = 0;
1057 }
1058 } else
1059 UDP6_INC_STATS_USER(sock_net(sk),
1060 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061out:
1062 up->len = 0;
1063 up->pending = 0;
1064 return err;
1065}
1066
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001067int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 struct msghdr *msg, size_t len)
1069{
1070 struct ipv6_txoptions opt_space;
1071 struct udp_sock *up = udp_sk(sk);
1072 struct inet_sock *inet = inet_sk(sk);
1073 struct ipv6_pinfo *np = inet6_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001074 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001075 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 struct ipv6_txoptions *opt = NULL;
1077 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001078 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 struct dst_entry *dst;
1080 int addr_len = msg->msg_namelen;
1081 int ulen = len;
1082 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001083 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001084 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1086 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001087 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001088 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001089 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
1091 /* destination address check */
1092 if (sin6) {
1093 if (addr_len < offsetof(struct sockaddr, sa_data))
1094 return -EINVAL;
1095
1096 switch (sin6->sin6_family) {
1097 case AF_INET6:
1098 if (addr_len < SIN6_LEN_RFC2133)
1099 return -EINVAL;
1100 daddr = &sin6->sin6_addr;
1101 break;
1102 case AF_INET:
1103 goto do_udp_sendmsg;
1104 case AF_UNSPEC:
1105 msg->msg_name = sin6 = NULL;
1106 msg->msg_namelen = addr_len = 0;
1107 daddr = NULL;
1108 break;
1109 default:
1110 return -EINVAL;
1111 }
1112 } else if (!up->pending) {
1113 if (sk->sk_state != TCP_ESTABLISHED)
1114 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001115 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001116 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 daddr = NULL;
1118
1119 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001120 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 struct sockaddr_in sin;
1122 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001123 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1125 msg->msg_name = &sin;
1126 msg->msg_namelen = sizeof(sin);
1127do_udp_sendmsg:
1128 if (__ipv6_only_sock(sk))
1129 return -ENETUNREACH;
1130 return udp_sendmsg(iocb, sk, msg, len);
1131 }
1132 }
1133
1134 if (up->pending == AF_INET)
1135 return udp_sendmsg(iocb, sk, msg, len);
1136
1137 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001138 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 */
1140 if (len > INT_MAX - sizeof(struct udphdr))
1141 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 if (up->pending) {
1144 /*
1145 * There are pending frames.
1146 * The socket lock must be held while it's corked.
1147 */
1148 lock_sock(sk);
1149 if (likely(up->pending)) {
1150 if (unlikely(up->pending != AF_INET6)) {
1151 release_sock(sk);
1152 return -EAFNOSUPPORT;
1153 }
1154 dst = NULL;
1155 goto do_append_data;
1156 }
1157 release_sock(sk);
1158 }
1159 ulen += sizeof(struct udphdr);
1160
David S. Miller4c9483b2011-03-12 16:22:43 -05001161 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 if (sin6) {
1164 if (sin6->sin6_port == 0)
1165 return -EINVAL;
1166
David S. Miller1958b852011-03-12 16:36:19 -05001167 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 daddr = &sin6->sin6_addr;
1169
1170 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001171 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1172 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1173 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 if (flowlabel == NULL)
1175 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 }
1177 }
1178
1179 /*
1180 * Otherwise it will be difficult to maintain
1181 * sk->sk_dst_cache.
1182 */
1183 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001184 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1185 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 if (addr_len >= sizeof(struct sockaddr_in6) &&
1188 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001189 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001190 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 } else {
1192 if (sk->sk_state != TCP_ESTABLISHED)
1193 return -EDESTADDRREQ;
1194
David S. Miller1958b852011-03-12 16:36:19 -05001195 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001196 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001197 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001198 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 }
1200
David S. Miller4c9483b2011-03-12 16:22:43 -05001201 if (!fl6.flowi6_oif)
1202 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
David S. Miller4c9483b2011-03-12 16:22:43 -05001204 if (!fl6.flowi6_oif)
1205 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001206
David S. Miller4c9483b2011-03-12 16:22:43 -05001207 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 if (msg->msg_controllen) {
1210 opt = &opt_space;
1211 memset(opt, 0, sizeof(struct ipv6_txoptions));
1212 opt->tot_len = sizeof(*opt);
1213
Tom Parkin73df66f2013-01-31 01:02:24 +00001214 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1215 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 if (err < 0) {
1217 fl6_sock_release(flowlabel);
1218 return err;
1219 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001220 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1221 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 if (flowlabel == NULL)
1223 return -EINVAL;
1224 }
1225 if (!(opt->opt_nflen|opt->opt_flen))
1226 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001227 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 }
1229 if (opt == NULL)
1230 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001231 if (flowlabel)
1232 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1233 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
David S. Miller4c9483b2011-03-12 16:22:43 -05001235 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001236 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001237 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001238 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001239 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1240 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001241 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001242 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001243
David S. Miller4c9483b2011-03-12 16:22:43 -05001244 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001245 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001246 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
David S. Miller4c9483b2011-03-12 16:22:43 -05001248 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1249 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001250 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001251 } else if (!fl6.flowi6_oif)
1252 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
David S. Miller4c9483b2011-03-12 16:22:43 -05001254 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001255
Steffen Klassert0e0d44a2013-08-28 08:04:14 +02001256 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001257 if (IS_ERR(dst)) {
1258 err = PTR_ERR(dst);
1259 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001261 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
Lorenzo Colitti5c986312014-04-29 11:57:34 +09001263 if (hlimit < 0)
1264 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265
Gerrit Renkere651f032009-08-09 08:12:48 +00001266 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001267 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001268
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 if (msg->msg_flags&MSG_CONFIRM)
1270 goto do_confirm;
1271back_from_confirm:
1272
1273 lock_sock(sk);
1274 if (unlikely(up->pending)) {
1275 /* The socket is already corked while preparing it. */
1276 /* ... which is an evident application bug. --ANK */
1277 release_sock(sk);
1278
Patrick McHardy64ce2072005-08-09 20:50:53 -07001279 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 err = -EINVAL;
1281 goto out;
1282 }
1283
1284 up->pending = AF_INET6;
1285
1286do_append_data:
Jiri Pirkoe36d3ff2013-10-19 12:29:15 +02001287 if (dontfrag < 0)
1288 dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001290 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1291 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001292 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001293 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001294 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 if (err)
1296 udp_v6_flush_pending_frames(sk);
1297 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001298 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001299 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1300 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
David S. Millera5e7c212005-10-03 14:21:58 -07001302 if (dst) {
1303 if (connected) {
1304 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001305 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1306 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001307#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001308 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001309 &np->saddr :
1310#endif
1311 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001312 } else {
1313 dst_release(dst);
1314 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001315 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001316 }
1317
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 if (err > 0)
1319 err = np->recverr ? net_xmit_errno(err) : 0;
1320 release_sock(sk);
1321out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001322 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001324 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001326 /*
1327 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1328 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1329 * we don't have a good statistic (IpOutDiscards but it can be too many
1330 * things). We could add another new stat but at least for now that
1331 * seems like overkill.
1332 */
1333 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001334 UDP6_INC_STATS_USER(sock_net(sk),
1335 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001336 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 return err;
1338
1339do_confirm:
1340 dst_confirm(dst);
1341 if (!(msg->msg_flags&MSG_PROBE) || len)
1342 goto back_from_confirm;
1343 err = 0;
1344 goto out;
1345}
1346
Brian Haley7d06b2e2008-06-14 17:04:49 -07001347void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348{
Tom Parkin44046a52013-03-19 06:11:12 +00001349 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 lock_sock(sk);
1351 udp_v6_flush_pending_frames(sk);
1352 release_sock(sk);
1353
Tom Parkin44046a52013-03-19 06:11:12 +00001354 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1355 void (*encap_destroy)(struct sock *sk);
1356 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1357 if (encap_destroy)
1358 encap_destroy(sk);
1359 }
1360
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362}
1363
1364/*
1365 * Socket option code for UDP
1366 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001367int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001368 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001369{
David S. Millerdb8dac22008-03-06 16:22:02 -08001370 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001371 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1372 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001373 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001374}
1375
1376#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001377int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001378 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001379{
David S. Millerdb8dac22008-03-06 16:22:02 -08001380 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001381 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1382 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001383 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001384}
1385#endif
1386
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001387int udpv6_getsockopt(struct sock *sk, int level, int optname,
1388 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001389{
David S. Millerdb8dac22008-03-06 16:22:02 -08001390 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001391 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001392 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001393}
1394
1395#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001396int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1397 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001398{
David S. Millerdb8dac22008-03-06 16:22:02 -08001399 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001400 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001401 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001402}
1403#endif
1404
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001405static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 .handler = udpv6_rcv,
1407 .err_handler = udpv6_err,
1408 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1409};
1410
1411/* ------------------------------------------------------------------------ */
1412#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001413int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001415 if (v == SEQ_START_TOKEN) {
1416 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1417 } else {
1418 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1419 struct inet_sock *inet = inet_sk(v);
1420 __u16 srcp = ntohs(inet->inet_sport);
1421 __u16 destp = ntohs(inet->inet_dport);
1422 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 return 0;
1425}
1426
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001427static const struct file_operations udp6_afinfo_seq_fops = {
1428 .owner = THIS_MODULE,
1429 .open = udp_seq_open,
1430 .read = seq_read,
1431 .llseek = seq_lseek,
1432 .release = seq_release_net
1433};
1434
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 .name = "udp6",
1437 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001438 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001439 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001440 .seq_ops = {
1441 .show = udp6_seq_show,
1442 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443};
1444
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001445int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001447 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448}
1449
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001450void udp6_proc_exit(struct net *net) {
1451 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452}
1453#endif /* CONFIG_PROC_FS */
1454
Eric Dumazetf77d6022013-05-09 10:28:16 +00001455void udp_v6_clear_sk(struct sock *sk, int size)
1456{
1457 struct inet_sock *inet = inet_sk(sk);
1458
1459 /* we do not want to clear pinet6 field, because of RCU lookups */
1460 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1461
1462 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1463 memset(&inet->pinet6 + 1, 0, size);
1464}
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466/* ------------------------------------------------------------------------ */
1467
1468struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001469 .name = "UDPv6",
1470 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001471 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001472 .connect = ip6_datagram_connect,
1473 .disconnect = udp_disconnect,
1474 .ioctl = udp_ioctl,
1475 .destroy = udpv6_destroy_sock,
1476 .setsockopt = udpv6_setsockopt,
1477 .getsockopt = udpv6_getsockopt,
1478 .sendmsg = udpv6_sendmsg,
1479 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001480 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001481 .hash = udp_lib_hash,
1482 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001483 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001484 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001485 .memory_allocated = &udp_memory_allocated,
1486 .sysctl_mem = sysctl_udp_mem,
1487 .sysctl_wmem = &sysctl_udp_wmem_min,
1488 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001489 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001490 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001491 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001492#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001493 .compat_setsockopt = compat_udpv6_setsockopt,
1494 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001495#endif
Eric Dumazetf77d6022013-05-09 10:28:16 +00001496 .clear_sk = udp_v6_clear_sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497};
1498
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499static struct inet_protosw udpv6_protosw = {
1500 .type = SOCK_DGRAM,
1501 .protocol = IPPROTO_UDP,
1502 .prot = &udpv6_prot,
1503 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 .flags = INET_PROTOSW_PERMANENT,
1505};
1506
1507
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001508int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001510 int ret;
1511
Vlad Yasevich33362882012-11-15 08:49:15 +00001512 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1513 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001514 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001515
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001516 ret = inet6_register_protosw(&udpv6_protosw);
1517 if (ret)
1518 goto out_udpv6_protocol;
1519out:
1520 return ret;
1521
1522out_udpv6_protocol:
1523 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1524 goto out;
1525}
1526
Daniel Lezcano09f77092007-12-13 05:34:58 -08001527void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001528{
1529 inet6_unregister_protosw(&udpv6_protosw);
1530 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}