blob: 7fe0329c0d37875d41ac8e1d385cbaadecd0927f [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
Eric Dumazet6eada012015-03-18 14:05:33 -070056static u32 udp6_ehashfn(const struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020061{
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 Dumazet6eada012015-03-18 14:05:33 -0700107static u32 udp6_portaddr_hash(const struct net *net,
108 const struct in6_addr *addr6,
109 unsigned int port)
Eric Dumazetd4cada42009-11-08 10:17:30 +0000110{
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{
Joe Perches60c04ae2014-12-01 20:29:06 -0800151 int score;
152 struct inet_sock *inet;
Eric Dumazet645ca702008-10-29 01:41:45 -0700153
Joe Perches60c04ae2014-12-01 20:29:06 -0800154 if (!net_eq(sock_net(sk), net) ||
155 udp_sk(sk)->udp_port_hash != hnum ||
156 sk->sk_family != PF_INET6)
157 return -1;
Eric Dumazet645ca702008-10-29 01:41:45 -0700158
Joe Perches60c04ae2014-12-01 20:29:06 -0800159 score = 0;
160 inet = inet_sk(sk);
161
162 if (inet->inet_dport) {
163 if (inet->inet_dport != sport)
164 return -1;
165 score++;
Eric Dumazet645ca702008-10-29 01:41:45 -0700166 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800167
168 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
169 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
170 return -1;
171 score++;
172 }
173
174 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
175 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
176 return -1;
177 score++;
178 }
179
180 if (sk->sk_bound_dev_if) {
181 if (sk->sk_bound_dev_if != dif)
182 return -1;
183 score++;
184 }
185
Eric Dumazet645ca702008-10-29 01:41:45 -0700186 return score;
187}
188
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000189#define SCORE2_MAX (1 + 1 + 1)
190static inline int compute_score2(struct sock *sk, struct net *net,
Joe Perches60c04ae2014-12-01 20:29:06 -0800191 const struct in6_addr *saddr, __be16 sport,
192 const struct in6_addr *daddr,
193 unsigned short hnum, int dif)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000194{
Joe Perches60c04ae2014-12-01 20:29:06 -0800195 int score;
196 struct inet_sock *inet;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000197
Joe Perches60c04ae2014-12-01 20:29:06 -0800198 if (!net_eq(sock_net(sk), net) ||
199 udp_sk(sk)->udp_port_hash != hnum ||
200 sk->sk_family != PF_INET6)
201 return -1;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000202
Joe Perches60c04ae2014-12-01 20:29:06 -0800203 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
204 return -1;
205
206 score = 0;
207 inet = inet_sk(sk);
208
209 if (inet->inet_dport) {
210 if (inet->inet_dport != sport)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000211 return -1;
Joe Perches60c04ae2014-12-01 20:29:06 -0800212 score++;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000213 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800214
215 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
216 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
217 return -1;
218 score++;
219 }
220
221 if (sk->sk_bound_dev_if) {
222 if (sk->sk_bound_dev_if != dif)
223 return -1;
224 score++;
225 }
226
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000227 return score;
228}
229
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000230/* called with read_rcu_lock() */
231static struct sock *udp6_lib_lookup2(struct net *net,
232 const struct in6_addr *saddr, __be16 sport,
233 const struct in6_addr *daddr, unsigned int hnum, int dif,
234 struct udp_hslot *hslot2, unsigned int slot2)
235{
236 struct sock *sk, *result;
237 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000238 int score, badness, matches = 0, reuseport = 0;
239 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000240
241begin:
242 result = NULL;
243 badness = -1;
244 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
245 score = compute_score2(sk, net, saddr, sport,
246 daddr, hnum, dif);
247 if (score > badness) {
248 result = sk;
249 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000250 reuseport = sk->sk_reuseport;
251 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200252 hash = udp6_ehashfn(net, daddr, hnum,
253 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000254 matches = 1;
255 } else if (score == SCORE2_MAX)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000256 goto exact_match;
Tom Herbert72289b92013-01-22 09:50:44 +0000257 } else if (score == badness && reuseport) {
258 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200259 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000260 result = sk;
261 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000262 }
263 }
264 /*
265 * if the nulls value we got at the end of this lookup is
266 * not the expected one, we must restart lookup.
267 * We probably met an item that was moved to another chain.
268 */
269 if (get_nulls_value(node) != slot2)
270 goto begin;
271
272 if (result) {
273exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000274 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000275 result = NULL;
276 else if (unlikely(compute_score2(result, net, saddr, sport,
277 daddr, hnum, dif) < badness)) {
278 sock_put(result);
279 goto begin;
280 }
281 }
282 return result;
283}
284
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000285struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200286 const struct in6_addr *saddr, __be16 sport,
287 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700288 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700290 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800291 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000293 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
294 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000295 int score, badness, matches = 0, reuseport = 0;
296 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Eric Dumazet271b72c2008-10-29 02:11:14 -0700298 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000299 if (hslot->count > 10) {
300 hash2 = udp6_portaddr_hash(net, daddr, hnum);
301 slot2 = hash2 & udptable->mask;
302 hslot2 = &udptable->hash2[slot2];
303 if (hslot->count < hslot2->count)
304 goto begin;
305
306 result = udp6_lib_lookup2(net, saddr, sport,
307 daddr, hnum, dif,
308 hslot2, slot2);
309 if (!result) {
310 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
311 slot2 = hash2 & udptable->mask;
312 hslot2 = &udptable->hash2[slot2];
313 if (hslot->count < hslot2->count)
314 goto begin;
315
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000316 result = udp6_lib_lookup2(net, saddr, sport,
317 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000318 hslot2, slot2);
319 }
320 rcu_read_unlock();
321 return result;
322 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700323begin:
324 result = NULL;
325 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800326 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700327 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
328 if (score > badness) {
329 result = sk;
330 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000331 reuseport = sk->sk_reuseport;
332 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200333 hash = udp6_ehashfn(net, daddr, hnum,
334 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000335 matches = 1;
336 }
337 } else if (score == badness && reuseport) {
338 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200339 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000340 result = sk;
341 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
343 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800344 /*
345 * if the nulls value we got at the end of this lookup is
346 * not the expected one, we must restart lookup.
347 * We probably met an item that was moved to another chain.
348 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000349 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800350 goto begin;
351
Eric Dumazet271b72c2008-10-29 02:11:14 -0700352 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000353 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700354 result = NULL;
355 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
356 daddr, dport, dif) < badness)) {
357 sock_put(result);
358 goto begin;
359 }
360 }
361 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return result;
363}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000364EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700366static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
367 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700368 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700369{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700370 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000371 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700372
Ian Morrise5d08d72014-11-23 21:28:43 +0000373 sk = skb_steal_sock(skb);
374 if (unlikely(sk))
KOVACS Krisztian23542612008-10-07 12:41:01 -0700375 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000376 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
377 &iph->daddr, dport, inet6_iif(skb),
378 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700379}
380
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200381struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
382 const struct in6_addr *daddr, __be16 dport, int dif)
383{
384 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
385}
386EXPORT_SYMBOL_GPL(udp6_lib_lookup);
387
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389/*
Ian Morris67ba4152014-08-24 21:53:10 +0100390 * This should be easy, if there is something there we
391 * return it, otherwise we block.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 */
393
Ying Xue1b784142015-03-02 15:37:48 +0800394int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 int noblock, int flags, int *addr_len)
396{
397 struct ipv6_pinfo *np = inet6_sk(sk);
398 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900399 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500400 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000401 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700402 int err;
403 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000404 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000405 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100408 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Brian Haley4b340ae2010-04-23 11:26:09 +0000410 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100411 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800414 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000415 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 if (!skb)
417 goto out;
418
Herbert Xu759e5d02007-03-25 20:10:56 -0700419 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500420 copied = len;
421 if (copied > ulen)
422 copied = ulen;
423 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900424 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Wei Yongjunf26ba172008-11-02 16:11:01 +0000426 is_udp4 = (skb->protocol == htons(ETH_P_IP));
427
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800428 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700429 * If checksum is needed at all, try to do it while copying the
430 * data. If the data is truncated, or if we only want a partial
431 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800432 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800433
David S. Miller59c2cda2011-12-01 14:12:55 -0500434 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700435 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800437 }
438
Herbert Xu60476372007-04-09 11:59:39 -0700439 if (skb_csum_unnecessary(skb))
David S. Miller51f3d022014-11-05 16:46:40 -0500440 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
441 msg, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800442 else {
Al Viro227158d2014-04-06 18:47:38 -0400443 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (err == -EINVAL)
445 goto csum_copy_err;
446 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000447 if (unlikely(err)) {
448 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000449 if (!peeked) {
450 atomic_inc(&sk->sk_drops);
451 if (is_udp4)
452 UDP_INC_STATS_USER(sock_net(sk),
453 UDP_MIB_INERRORS,
454 is_udplite);
455 else
456 UDP6_INC_STATS_USER(sock_net(sk),
457 UDP_MIB_INERRORS,
458 is_udplite);
459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000461 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000462 if (!peeked) {
463 if (is_udp4)
464 UDP_INC_STATS_USER(sock_net(sk),
465 UDP_MIB_INDATAGRAMS, is_udplite);
466 else
467 UDP6_INC_STATS_USER(sock_net(sk),
468 UDP_MIB_INDATAGRAMS, is_udplite);
469 }
Wang Chencb759942007-12-03 22:33:28 +1100470
Neil Horman3b885782009-10-12 13:26:31 -0700471 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 /* Copy the address. */
474 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100475 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300477 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000480 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700481 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
482 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000483 sin6->sin6_scope_id = 0;
484 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000485 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000486 sin6->sin6_scope_id =
487 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800488 inet6_iif(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100490 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100492
493 if (np->rxopt.all)
494 ip6_datagram_recv_common_ctl(sk, msg, skb);
495
Wei Yongjunf26ba172008-11-02 16:11:01 +0000496 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 if (inet->cmsg_flags)
498 ip_cmsg_recv(msg, skb);
499 } else {
500 if (np->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100501 ip6_datagram_recv_specific_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900502 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
David S. Miller59c2cda2011-12-01 14:12:55 -0500504 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700506 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000509 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510out:
511 return err;
512
513csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000514 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000515 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000516 if (is_udp4) {
517 UDP_INC_STATS_USER(sock_net(sk),
518 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000519 UDP_INC_STATS_USER(sock_net(sk),
520 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000521 } else {
522 UDP6_INC_STATS_USER(sock_net(sk),
523 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000524 UDP6_INC_STATS_USER(sock_net(sk),
525 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000526 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000527 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000528 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Xufeng Zhang32c90252011-06-21 10:43:39 +0000530 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000532
533 /* starting over for a new packet */
534 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 goto try_again;
536}
537
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800538void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700539 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700540 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
542 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000543 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
544 const struct in6_addr *saddr = &hdr->saddr;
545 const struct in6_addr *daddr = &hdr->daddr;
Ian Morris67ba4152014-08-24 21:53:10 +0100546 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 struct sock *sk;
548 int err;
Duan Jiong7304fe42014-07-31 17:54:32 +0800549 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Duan Jiong7304fe42014-07-31 17:54:32 +0800551 sk = __udp6_lib_lookup(net, daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800552 saddr, uh->source, inet6_iif(skb), udptable);
Duan Jiong7304fe42014-07-31 17:54:32 +0800553 if (sk == NULL) {
554 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
555 ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 return;
Duan Jiong7304fe42014-07-31 17:54:32 +0800557 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100559 if (type == ICMPV6_PKT_TOOBIG) {
560 if (!ip6_sk_accept_pmtu(sk))
561 goto out;
David S. Miller81aded22012-06-15 14:54:11 -0700562 ip6_sk_update_pmtu(skb, sk, info);
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100563 }
Duan Jiong1a462d12013-09-20 18:20:28 +0800564 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700565 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800566 goto out;
567 }
David S. Miller81aded22012-06-15 14:54:11 -0700568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 np = inet6_sk(sk);
570
571 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
572 goto out;
573
574 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
575 goto out;
576
Eric Dumazetb1faf562010-05-31 23:44:05 -0700577 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 sk->sk_err = err;
581 sk->sk_error_report(sk);
582out:
583 sock_put(sk);
584}
585
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000586static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
587{
588 int rc;
589
Eric Dumazetefe42082013-10-03 15:42:29 -0700590 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000591 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500592 sk_mark_napi_id(sk, skb);
Eric Dumazet2c8c56e2014-11-11 05:54:28 -0800593 sk_incoming_cpu_update(sk);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500594 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000595
596 rc = sock_queue_rcv_skb(sk, skb);
597 if (rc < 0) {
598 int is_udplite = IS_UDPLITE(sk);
599
600 /* Note that an ENOMEM error is charged twice */
601 if (rc == -ENOMEM)
602 UDP6_INC_STATS_BH(sock_net(sk),
603 UDP_MIB_RCVBUFERRORS, is_udplite);
604 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
605 kfree_skb(skb);
606 return -1;
607 }
608 return 0;
609}
610
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800611static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700612 struct inet6_skb_parm *opt, u8 type,
Ian Morris67ba4152014-08-24 21:53:10 +0100613 u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614{
Eric Dumazet645ca702008-10-29 01:41:45 -0700615 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800616}
617
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000618static struct static_key udpv6_encap_needed __read_mostly;
619void udpv6_encap_enable(void)
620{
621 if (!static_key_enabled(&udpv6_encap_needed))
622 static_key_slow_inc(&udpv6_encap_needed);
623}
624EXPORT_SYMBOL(udpv6_encap_enable);
625
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000626int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800627{
628 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700629 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100630 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700631
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800632 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
633 goto drop;
634
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000635 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
636 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
637
638 /*
639 * This is an encapsulation socket so pass the skb to
640 * the socket's udp_encap_rcv() hook. Otherwise, just
641 * fall through and pass this up the UDP socket.
642 * up->encap_rcv() returns the following value:
643 * =0 if skb was successfully passed to the encap
644 * handler or was discarded by it.
645 * >0 if skb should be passed on to UDP.
646 * <0 if skb should be resubmitted as proto -N
647 */
648
649 /* if we're overly short, let UDP handle it */
650 encap_rcv = ACCESS_ONCE(up->encap_rcv);
651 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
652 int ret;
653
Tom Herbert0a809662014-05-07 16:52:39 -0700654 /* Verify checksum before giving to encap */
655 if (udp_lib_checksum_complete(skb))
656 goto csum_error;
657
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000658 ret = encap_rcv(sk, skb);
659 if (ret <= 0) {
660 UDP_INC_STATS_BH(sock_net(sk),
661 UDP_MIB_INDATAGRAMS,
662 is_udplite);
663 return -ret;
664 }
665 }
666
667 /* FALLTHROUGH -- it's a UDP Packet */
668 }
669
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800670 /*
671 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
672 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100673 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800674
675 if (up->pcrlen == 0) { /* full coverage was set */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800676 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
677 UDP_SKB_CB(skb)->cscov, skb->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800678 goto drop;
679 }
680 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800681 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
682 UDP_SKB_CB(skb)->cscov, up->pcrlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800683 goto drop;
684 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 }
686
Eric Dumazet33d480c2011-08-11 19:30:52 +0000687 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800688 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000689 goto csum_error;
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800690 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Sorin Dumitru274f4822014-07-22 21:16:51 +0300692 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
James M Leddy3e215c82014-06-25 17:38:13 -0400693 UDP6_INC_STATS_BH(sock_net(sk),
694 UDP_MIB_RCVBUFERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000695 goto drop;
James M Leddy3e215c82014-06-25 17:38:13 -0400696 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000697
Eric Dumazetd826eb12011-11-09 07:24:35 +0000698 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100699
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000700 bh_lock_sock(sk);
701 rc = 0;
702 if (!sock_owned_by_user(sk))
703 rc = __udpv6_queue_rcv_skb(sk, skb);
704 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
705 bh_unlock_sock(sk);
706 goto drop;
707 }
708 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000709
710 return rc;
James M Leddy3e215c82014-06-25 17:38:13 -0400711
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000712csum_error:
713 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800714drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700715 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000716 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800717 kfree_skb(skb);
718 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719}
720
David Held5cf3d462014-07-15 23:28:31 -0400721static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
722 __be16 loc_port, const struct in6_addr *loc_addr,
723 __be16 rmt_port, const struct in6_addr *rmt_addr,
724 int dif, unsigned short hnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725{
David Held5cf3d462014-07-15 23:28:31 -0400726 struct inet_sock *inet = inet_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
David Held5cf3d462014-07-15 23:28:31 -0400728 if (!net_eq(sock_net(sk), net))
729 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
David Held5cf3d462014-07-15 23:28:31 -0400731 if (udp_sk(sk)->udp_port_hash != hnum ||
732 sk->sk_family != PF_INET6 ||
733 (inet->inet_dport && inet->inet_dport != rmt_port) ||
734 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
735 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
736 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
737 return false;
738 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
739 return false;
740 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741}
742
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000743static void flush_stack(struct sock **stack, unsigned int count,
744 struct sk_buff *skb, unsigned int final)
745{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000746 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000747 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000748 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000749
750 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000751 sk = stack[i];
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000752 if (likely(skb1 == NULL))
753 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
754 if (!skb1) {
755 atomic_inc(&sk->sk_drops);
756 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
757 IS_UDPLITE(sk));
758 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
759 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000760 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000761
762 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
763 skb1 = NULL;
David Held2dc41cf2014-07-15 23:28:32 -0400764 sock_put(sk);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000765 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000766 if (unlikely(skb1))
767 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000768}
Tom Herbert40685792014-05-02 16:29:58 -0700769
770static void udp6_csum_zero_error(struct sk_buff *skb)
771{
772 /* RFC 2460 section 8.1 says that we SHOULD log
773 * this error. Well, it is reasonable.
774 */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800775 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
776 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
777 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
Tom Herbert40685792014-05-02 16:29:58 -0700778}
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780/*
781 * Note: called only from the BH handler context,
782 * so we don't need to lock the hashes.
783 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700784static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000785 const struct in6_addr *saddr, const struct in6_addr *daddr,
Rick Jones36cbb242014-11-06 10:37:54 -0800786 struct udp_table *udptable, int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000788 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300789 const struct udphdr *uh = udp_hdr(skb);
David Held5cf3d462014-07-15 23:28:31 -0400790 struct hlist_nulls_node *node;
791 unsigned short hnum = ntohs(uh->dest);
792 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
793 int dif = inet6_iif(skb);
David Held2dc41cf2014-07-15 23:28:32 -0400794 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
795 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
Rick Jones36cbb242014-11-06 10:37:54 -0800796 bool inner_flushed = false;
David Held2dc41cf2014-07-15 23:28:32 -0400797
798 if (use_hash2) {
799 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
800 udp_table.mask;
801 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
802start_lookup:
803 hslot = &udp_table.hash2[hash2];
804 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
805 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
Eric Dumazet645ca702008-10-29 01:41:45 -0700807 spin_lock(&hslot->lock);
David Held2dc41cf2014-07-15 23:28:32 -0400808 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
David Held5cf3d462014-07-15 23:28:31 -0400809 if (__udp_v6_is_mcast_sock(net, sk,
810 uh->dest, daddr,
811 uh->source, saddr,
812 dif, hnum) &&
813 /* If zero checksum and no_check is not on for
814 * the socket then skip it.
815 */
816 (uh->check || udp_sk(sk)->no_check6_rx)) {
817 if (unlikely(count == ARRAY_SIZE(stack))) {
818 flush_stack(stack, count, skb, ~0);
Rick Jones36cbb242014-11-06 10:37:54 -0800819 inner_flushed = true;
David Held5cf3d462014-07-15 23:28:31 -0400820 count = 0;
821 }
Tom Herbert40685792014-05-02 16:29:58 -0700822 stack[count++] = sk;
David Held2dc41cf2014-07-15 23:28:32 -0400823 sock_hold(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800824 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000826
Eric Dumazet645ca702008-10-29 01:41:45 -0700827 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000828
David Held2dc41cf2014-07-15 23:28:32 -0400829 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
830 if (use_hash2 && hash2 != hash2_any) {
831 hash2 = hash2_any;
832 goto start_lookup;
833 }
834
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000835 if (count) {
836 flush_stack(stack, count, skb, count - 1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000837 } else {
Rick Jones36cbb242014-11-06 10:37:54 -0800838 if (!inner_flushed)
839 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
840 proto == IPPROTO_UDPLITE);
841 consume_skb(skb);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000842 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800843 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844}
845
Eric Dumazet645ca702008-10-29 01:41:45 -0700846int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700847 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000849 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900851 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000852 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 u32 ulen = 0;
854
855 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000856 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800863 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 goto short_packet;
865
Herbert Xu759e5d02007-03-25 20:10:56 -0700866 if (proto == IPPROTO_UDP) {
867 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800869 /* Check for jumbo payload */
870 if (ulen == 0)
871 ulen = skb->len;
872
873 if (ulen < sizeof(*uh))
874 goto short_packet;
875
876 if (ulen < skb->len) {
877 if (pskb_trim_rcsum(skb, ulen))
878 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700879 saddr = &ipv6_hdr(skb)->saddr;
880 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300881 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800882 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 }
884
Herbert Xu759e5d02007-03-25 20:10:56 -0700885 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000886 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700887
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900888 /*
889 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800891 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700892 return __udp6_lib_mcast_deliver(net, skb,
Rick Jones36cbb242014-11-06 10:37:54 -0800893 saddr, daddr, udptable, proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 /* Unicast */
896
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900897 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 * check socket cache ... must talk to Alan about his plans
899 * for sock caches... i'll skip this for now.
900 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700901 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000902 if (sk != NULL) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300903 int ret;
904
Tom Herbert1c194482014-05-23 08:47:32 -0700905 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
Tom Herbert79e0f1c2014-05-05 16:43:58 -0700906 sock_put(sk);
Tom Herbert40685792014-05-02 16:29:58 -0700907 udp6_csum_zero_error(skb);
908 goto csum_error;
909 }
910
Tom Herbert224d0192015-01-05 13:56:14 -0800911 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
Tom Herbert2abb7cd2014-08-31 15:12:43 -0700912 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
913 ip6_compute_pseudo);
914
Eliezer Tamira5b50472013-06-10 11:40:00 +0300915 ret = udpv6_queue_rcv_skb(sk, skb);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000916 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000918 /* a return value > 0 means to resubmit the input, but
919 * it wants the return to be -protocol, or 0
920 */
921 if (ret > 0)
922 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800924 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900926
Tom Herbert40685792014-05-02 16:29:58 -0700927 if (!uh->check) {
928 udp6_csum_zero_error(skb);
929 goto csum_error;
930 }
931
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000932 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
933 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900934
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000935 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000936 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000937
938 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
939 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
940
941 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800942 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900944short_packet:
Joe Perchesba7a46f2014-11-11 10:59:17 -0800945 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
946 proto == IPPROTO_UDPLITE ? "-Lite" : "",
947 saddr, ntohs(uh->source),
948 ulen, skb->len,
949 daddr, ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000950 goto discard;
951csum_error:
952 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700954 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800956 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800958
Herbert Xue5bbef22007-10-15 12:50:28 -0700959static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800960{
Eric Dumazet645ca702008-10-29 01:41:45 -0700961 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800962}
963
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964/*
965 * Throw away all pending data and cancel the corking. Socket is locked.
966 */
967static void udp_v6_flush_pending_frames(struct sock *sk)
968{
969 struct udp_sock *up = udp_sk(sk);
970
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400971 if (up->pending == AF_INET)
972 udp_flush_pending_frames(sk);
973 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 up->len = 0;
975 up->pending = 0;
976 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900977 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978}
979
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000980/**
Ian Morris67ba4152014-08-24 21:53:10 +0100981 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
982 * @sk: socket we are sending on
983 * @skb: sk_buff containing the filled-in UDP header
984 * (checksum field must be zeroed out)
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000985 */
986static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
987 const struct in6_addr *saddr,
988 const struct in6_addr *daddr, int len)
989{
990 unsigned int offset;
991 struct udphdr *uh = udp_hdr(skb);
Vlad Yasevichd39d9382015-01-31 10:40:16 -0500992 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000993 __wsum csum = 0;
994
Vlad Yasevichd39d9382015-01-31 10:40:16 -0500995 if (!frags) {
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000996 /* Only one fragment on the socket. */
997 skb->csum_start = skb_transport_header(skb) - skb->head;
998 skb->csum_offset = offsetof(struct udphdr, check);
999 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1000 } else {
1001 /*
1002 * HW-checksum won't work as there are two or more
1003 * fragments on the socket so that all csums of sk_buffs
1004 * should be together
1005 */
1006 offset = skb_transport_offset(skb);
1007 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1008
1009 skb->ip_summed = CHECKSUM_NONE;
1010
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001011 do {
1012 csum = csum_add(csum, frags->csum);
1013 } while ((frags = frags->next));
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001014
1015 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1016 csum);
1017 if (uh->check == 0)
1018 uh->check = CSUM_MANGLED_0;
1019 }
1020}
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022/*
1023 * Sending
1024 */
1025
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001026static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027{
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001028 struct sock *sk = skb->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001031 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -08001032 __wsum csum = 0;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001033 int offset = skb_transport_offset(skb);
1034 int len = skb->len - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
1036 /*
1037 * Create a UDP header
1038 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001039 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -05001040 uh->source = fl6->fl6_sport;
1041 uh->dest = fl6->fl6_dport;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001042 uh->len = htons(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 uh->check = 0;
1044
Wang Chenb2bf1e22007-12-03 22:34:16 +11001045 if (is_udplite)
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001046 csum = udplite_csum(skb);
1047 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
Tom Herbert40685792014-05-02 16:29:58 -07001048 skb->ip_summed = CHECKSUM_NONE;
1049 goto send;
1050 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001051 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001052 goto send;
1053 } else
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001054 csum = udp_csum(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001056 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001057 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001058 len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001060 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001062send:
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001063 err = ip6_send_skb(skb);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001064 if (err) {
1065 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1066 UDP6_INC_STATS_USER(sock_net(sk),
1067 UDP_MIB_SNDBUFERRORS, is_udplite);
1068 err = 0;
1069 }
1070 } else
1071 UDP6_INC_STATS_USER(sock_net(sk),
1072 UDP_MIB_OUTDATAGRAMS, is_udplite);
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001073 return err;
1074}
1075
1076static int udp_v6_push_pending_frames(struct sock *sk)
1077{
1078 struct sk_buff *skb;
1079 struct udp_sock *up = udp_sk(sk);
1080 struct flowi6 fl6;
1081 int err = 0;
1082
1083 if (up->pending == AF_INET)
1084 return udp_push_pending_frames(sk);
1085
1086 /* ip6_finish_skb will release the cork, so make a copy of
1087 * fl6 here.
1088 */
1089 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1090
1091 skb = ip6_finish_skb(sk);
1092 if (!skb)
1093 goto out;
1094
1095 err = udp_v6_send_skb(skb, &fl6);
1096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097out:
1098 up->len = 0;
1099 up->pending = 0;
1100 return err;
1101}
1102
Ying Xue1b784142015-03-02 15:37:48 +08001103int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104{
1105 struct ipv6_txoptions opt_space;
1106 struct udp_sock *up = udp_sk(sk);
1107 struct inet_sock *inet = inet_sk(sk);
1108 struct ipv6_pinfo *np = inet6_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001109 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001110 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 struct ipv6_txoptions *opt = NULL;
1112 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001113 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 struct dst_entry *dst;
1115 int addr_len = msg->msg_namelen;
1116 int ulen = len;
1117 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001118 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001119 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1121 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001122 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001123 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001124 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126 /* destination address check */
1127 if (sin6) {
1128 if (addr_len < offsetof(struct sockaddr, sa_data))
1129 return -EINVAL;
1130
1131 switch (sin6->sin6_family) {
1132 case AF_INET6:
1133 if (addr_len < SIN6_LEN_RFC2133)
1134 return -EINVAL;
1135 daddr = &sin6->sin6_addr;
1136 break;
1137 case AF_INET:
1138 goto do_udp_sendmsg;
1139 case AF_UNSPEC:
1140 msg->msg_name = sin6 = NULL;
1141 msg->msg_namelen = addr_len = 0;
1142 daddr = NULL;
1143 break;
1144 default:
1145 return -EINVAL;
1146 }
1147 } else if (!up->pending) {
1148 if (sk->sk_state != TCP_ESTABLISHED)
1149 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001150 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001151 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 daddr = NULL;
1153
1154 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001155 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 struct sockaddr_in sin;
1157 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001158 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1160 msg->msg_name = &sin;
1161 msg->msg_namelen = sizeof(sin);
1162do_udp_sendmsg:
1163 if (__ipv6_only_sock(sk))
1164 return -ENETUNREACH;
Ying Xue1b784142015-03-02 15:37:48 +08001165 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 }
1167 }
1168
1169 if (up->pending == AF_INET)
Ying Xue1b784142015-03-02 15:37:48 +08001170 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001173 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 */
1175 if (len > INT_MAX - sizeof(struct udphdr))
1176 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001177
Vlad Yasevich03485f22015-01-31 10:40:17 -05001178 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 if (up->pending) {
1180 /*
1181 * There are pending frames.
1182 * The socket lock must be held while it's corked.
1183 */
1184 lock_sock(sk);
1185 if (likely(up->pending)) {
1186 if (unlikely(up->pending != AF_INET6)) {
1187 release_sock(sk);
1188 return -EAFNOSUPPORT;
1189 }
1190 dst = NULL;
1191 goto do_append_data;
1192 }
1193 release_sock(sk);
1194 }
1195 ulen += sizeof(struct udphdr);
1196
David S. Miller4c9483b2011-03-12 16:22:43 -05001197 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
1199 if (sin6) {
1200 if (sin6->sin6_port == 0)
1201 return -EINVAL;
1202
David S. Miller1958b852011-03-12 16:36:19 -05001203 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 daddr = &sin6->sin6_addr;
1205
1206 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001207 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1208 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1209 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 if (flowlabel == NULL)
1211 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 }
1213 }
1214
1215 /*
1216 * Otherwise it will be difficult to maintain
1217 * sk->sk_dst_cache.
1218 */
1219 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001220 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1221 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
1223 if (addr_len >= sizeof(struct sockaddr_in6) &&
1224 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001225 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001226 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 } else {
1228 if (sk->sk_state != TCP_ESTABLISHED)
1229 return -EDESTADDRREQ;
1230
David S. Miller1958b852011-03-12 16:36:19 -05001231 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001232 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001233 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001234 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 }
1236
David S. Miller4c9483b2011-03-12 16:22:43 -05001237 if (!fl6.flowi6_oif)
1238 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
David S. Miller4c9483b2011-03-12 16:22:43 -05001240 if (!fl6.flowi6_oif)
1241 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001242
David S. Miller4c9483b2011-03-12 16:22:43 -05001243 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001244
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 if (msg->msg_controllen) {
1246 opt = &opt_space;
1247 memset(opt, 0, sizeof(struct ipv6_txoptions));
1248 opt->tot_len = sizeof(*opt);
1249
Tom Parkin73df66f2013-01-31 01:02:24 +00001250 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1251 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 if (err < 0) {
1253 fl6_sock_release(flowlabel);
1254 return err;
1255 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001256 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1257 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 if (flowlabel == NULL)
1259 return -EINVAL;
1260 }
1261 if (!(opt->opt_nflen|opt->opt_flen))
1262 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001263 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 }
1265 if (opt == NULL)
1266 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001267 if (flowlabel)
1268 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1269 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
David S. Miller4c9483b2011-03-12 16:22:43 -05001271 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001272 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001273 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001274 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001275 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1276 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001277 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001278 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001279
David S. Miller4c9483b2011-03-12 16:22:43 -05001280 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001281 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001282 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
David S. Miller4c9483b2011-03-12 16:22:43 -05001284 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1285 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001286 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001287 } else if (!fl6.flowi6_oif)
1288 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
David S. Miller4c9483b2011-03-12 16:22:43 -05001290 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001291
Steffen Klassert0e0d44a2013-08-28 08:04:14 +02001292 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001293 if (IS_ERR(dst)) {
1294 err = PTR_ERR(dst);
1295 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001297 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Lorenzo Colitti5c986312014-04-29 11:57:34 +09001299 if (hlimit < 0)
1300 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Gerrit Renkere651f032009-08-09 08:12:48 +00001302 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001303 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001304
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 if (msg->msg_flags&MSG_CONFIRM)
1306 goto do_confirm;
1307back_from_confirm:
1308
Vlad Yasevich03485f22015-01-31 10:40:17 -05001309 /* Lockless fast path for the non-corking case */
1310 if (!corkreq) {
1311 struct sk_buff *skb;
1312
1313 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1314 sizeof(struct udphdr), hlimit, tclass, opt,
1315 &fl6, (struct rt6_info *)dst,
1316 msg->msg_flags, dontfrag);
1317 err = PTR_ERR(skb);
1318 if (!IS_ERR_OR_NULL(skb))
1319 err = udp_v6_send_skb(skb, &fl6);
1320 goto release_dst;
1321 }
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 lock_sock(sk);
1324 if (unlikely(up->pending)) {
1325 /* The socket is already corked while preparing it. */
1326 /* ... which is an evident application bug. --ANK */
1327 release_sock(sk);
1328
Joe Perchesba7a46f2014-11-11 10:59:17 -08001329 net_dbg_ratelimited("udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 err = -EINVAL;
1331 goto out;
1332 }
1333
1334 up->pending = AF_INET6;
1335
1336do_append_data:
Jiri Pirkoe36d3ff2013-10-19 12:29:15 +02001337 if (dontfrag < 0)
1338 dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 up->len += ulen;
Al Virof69e6d12014-11-24 13:23:40 -05001340 err = ip6_append_data(sk, getfrag, msg, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001341 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
Ian Morris67ba4152014-08-24 21:53:10 +01001342 (struct rt6_info *)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001343 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 if (err)
1345 udp_v6_flush_pending_frames(sk);
1346 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001347 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001348 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1349 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
Vlad Yasevich03485f22015-01-31 10:40:17 -05001351 if (err > 0)
1352 err = np->recverr ? net_xmit_errno(err) : 0;
1353 release_sock(sk);
1354
1355release_dst:
David S. Millera5e7c212005-10-03 14:21:58 -07001356 if (dst) {
1357 if (connected) {
1358 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001359 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1360 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001361#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001362 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001363 &np->saddr :
1364#endif
1365 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001366 } else {
1367 dst_release(dst);
1368 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001369 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001370 }
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001373 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001375 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001377 /*
1378 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1379 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1380 * we don't have a good statistic (IpOutDiscards but it can be too many
1381 * things). We could add another new stat but at least for now that
1382 * seems like overkill.
1383 */
1384 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001385 UDP6_INC_STATS_USER(sock_net(sk),
1386 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 return err;
1389
1390do_confirm:
1391 dst_confirm(dst);
1392 if (!(msg->msg_flags&MSG_PROBE) || len)
1393 goto back_from_confirm;
1394 err = 0;
1395 goto out;
1396}
1397
Brian Haley7d06b2e2008-06-14 17:04:49 -07001398void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399{
Tom Parkin44046a52013-03-19 06:11:12 +00001400 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 lock_sock(sk);
1402 udp_v6_flush_pending_frames(sk);
1403 release_sock(sk);
1404
Tom Parkin44046a52013-03-19 06:11:12 +00001405 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1406 void (*encap_destroy)(struct sock *sk);
1407 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1408 if (encap_destroy)
1409 encap_destroy(sk);
1410 }
1411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413}
1414
1415/*
1416 * Socket option code for UDP
1417 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001418int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001419 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001420{
David S. Millerdb8dac22008-03-06 16:22:02 -08001421 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001422 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1423 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001424 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001425}
1426
1427#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001428int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001429 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001430{
David S. Millerdb8dac22008-03-06 16:22:02 -08001431 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001432 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1433 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001434 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001435}
1436#endif
1437
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001438int udpv6_getsockopt(struct sock *sk, int level, int optname,
1439 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001440{
David S. Millerdb8dac22008-03-06 16:22:02 -08001441 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001442 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001443 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001444}
1445
1446#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001447int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1448 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001449{
David S. Millerdb8dac22008-03-06 16:22:02 -08001450 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001451 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001452 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001453}
1454#endif
1455
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001456static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 .handler = udpv6_rcv,
1458 .err_handler = udpv6_err,
1459 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1460};
1461
1462/* ------------------------------------------------------------------------ */
1463#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001464int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001466 if (v == SEQ_START_TOKEN) {
1467 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1468 } else {
1469 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1470 struct inet_sock *inet = inet_sk(v);
1471 __u16 srcp = ntohs(inet->inet_sport);
1472 __u16 destp = ntohs(inet->inet_dport);
1473 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1474 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 return 0;
1476}
1477
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001478static const struct file_operations udp6_afinfo_seq_fops = {
1479 .owner = THIS_MODULE,
1480 .open = udp_seq_open,
1481 .read = seq_read,
1482 .llseek = seq_lseek,
1483 .release = seq_release_net
1484};
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 .name = "udp6",
1488 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001489 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001490 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001491 .seq_ops = {
1492 .show = udp6_seq_show,
1493 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494};
1495
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001496int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001498 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499}
1500
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001501void udp6_proc_exit(struct net *net) {
1502 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
1504#endif /* CONFIG_PROC_FS */
1505
Eric Dumazetf77d6022013-05-09 10:28:16 +00001506void udp_v6_clear_sk(struct sock *sk, int size)
1507{
1508 struct inet_sock *inet = inet_sk(sk);
1509
1510 /* we do not want to clear pinet6 field, because of RCU lookups */
1511 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1512
1513 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1514 memset(&inet->pinet6 + 1, 0, size);
1515}
1516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517/* ------------------------------------------------------------------------ */
1518
1519struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001520 .name = "UDPv6",
1521 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001522 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001523 .connect = ip6_datagram_connect,
1524 .disconnect = udp_disconnect,
1525 .ioctl = udp_ioctl,
1526 .destroy = udpv6_destroy_sock,
1527 .setsockopt = udpv6_setsockopt,
1528 .getsockopt = udpv6_getsockopt,
1529 .sendmsg = udpv6_sendmsg,
1530 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001531 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001532 .hash = udp_lib_hash,
1533 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001534 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001535 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001536 .memory_allocated = &udp_memory_allocated,
1537 .sysctl_mem = sysctl_udp_mem,
1538 .sysctl_wmem = &sysctl_udp_wmem_min,
1539 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001540 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001541 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001542 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001543#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001544 .compat_setsockopt = compat_udpv6_setsockopt,
1545 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001546#endif
Eric Dumazetf77d6022013-05-09 10:28:16 +00001547 .clear_sk = udp_v6_clear_sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548};
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550static struct inet_protosw udpv6_protosw = {
1551 .type = SOCK_DGRAM,
1552 .protocol = IPPROTO_UDP,
1553 .prot = &udpv6_prot,
1554 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 .flags = INET_PROTOSW_PERMANENT,
1556};
1557
1558
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001559int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001561 int ret;
1562
Vlad Yasevich33362882012-11-15 08:49:15 +00001563 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1564 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001565 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001566
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001567 ret = inet6_register_protosw(&udpv6_protosw);
1568 if (ret)
1569 goto out_udpv6_protocol;
1570out:
1571 return ret;
1572
1573out_udpv6_protocol:
1574 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1575 goto out;
1576}
1577
Daniel Lezcano09f77092007-12-13 05:34:58 -08001578void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001579{
1580 inet6_unregister_protosw(&udpv6_protosw);
1581 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582}