blob: 5d2c2afffe7b2c0790bc00505c518d21eb4b589b [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>
Craig Galleke32ea7e2016-01-04 17:41:46 -050050#include <net/sock_reuseport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52#include <linux/proc_fs.h>
53#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000054#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080055#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Eric Dumazet6eada012015-03-18 14:05:33 -070057static u32 udp6_ehashfn(const struct net *net,
58 const struct in6_addr *laddr,
59 const u16 lport,
60 const struct in6_addr *faddr,
61 const __be16 fport)
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020062{
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020063 static u32 udp6_ehash_secret __read_mostly;
64 static u32 udp_ipv6_hash_secret __read_mostly;
65
66 u32 lhash, fhash;
67
68 net_get_random_once(&udp6_ehash_secret,
69 sizeof(udp6_ehash_secret));
70 net_get_random_once(&udp_ipv6_hash_secret,
71 sizeof(udp_ipv6_hash_secret));
72
73 lhash = (__force u32)laddr->s6_addr32[3];
74 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020076 return __inet6_ehashfn(lhash, lport, fhash, fport,
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020077 udp_ipv6_hash_secret + net_hash_mix(net));
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020078}
79
Craig Galleke32ea7e2016-01-04 17:41:46 -050080/* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
81 * only, and any IPv4 addresses if not IPv6 only
82 * match_wildcard == false: addresses must be exactly the same, i.e.
83 * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
84 * and 0.0.0.0 equals to 0.0.0.0 only
85 */
86int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
87 bool match_wildcard)
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000088{
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000089 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000090 int sk2_ipv6only = inet_v6_ipv6only(sk2);
Eric Dumazetefe42082013-10-03 15:42:29 -070091 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000092 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
93
94 /* if both are mapped, treat as IPv4 */
Craig Galleke32ea7e2016-01-04 17:41:46 -050095 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
96 if (!sk2_ipv6only) {
97 if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
98 return 1;
99 if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
100 return match_wildcard;
101 }
102 return 0;
103 }
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000104
Craig Galleke32ea7e2016-01-04 17:41:46 -0500105 if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
106 return 1;
107
108 if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000109 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
110 return 1;
111
Craig Galleke32ea7e2016-01-04 17:41:46 -0500112 if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
Eric Dumazet9fe516b2014-06-27 08:36:16 -0700113 !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000114 return 1;
115
116 if (sk2_rcv_saddr6 &&
Eric Dumazetefe42082013-10-03 15:42:29 -0700117 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000118 return 1;
119
120 return 0;
121}
122
Eric Dumazet6eada012015-03-18 14:05:33 -0700123static u32 udp6_portaddr_hash(const struct net *net,
124 const struct in6_addr *addr6,
125 unsigned int port)
Eric Dumazetd4cada42009-11-08 10:17:30 +0000126{
127 unsigned int hash, mix = net_hash_mix(net);
128
129 if (ipv6_addr_any(addr6))
130 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +0000131 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700132 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000133 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700134 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000135
136 return hash ^ port;
137}
138
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700139int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
Eric Dumazet30fff922009-11-09 05:26:33 +0000141 unsigned int hash2_nulladdr =
142 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000143 unsigned int hash2_partial =
Eric Dumazetefe42082013-10-03 15:42:29 -0700144 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
Eric Dumazet30fff922009-11-09 05:26:33 +0000145
Eric Dumazetd4cada42009-11-08 10:17:30 +0000146 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000147 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
148 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
Eric Dumazet719f8352010-09-08 05:08:44 +0000151static void udp_v6_rehash(struct sock *sk)
152{
153 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
Eric Dumazetefe42082013-10-03 15:42:29 -0700154 &sk->sk_v6_rcv_saddr,
Eric Dumazet719f8352010-09-08 05:08:44 +0000155 inet_sk(sk)->inet_num);
156
157 udp_lib_rehash(sk, new_hash);
158}
159
Eric Dumazet645ca702008-10-29 01:41:45 -0700160static inline int compute_score(struct sock *sk, struct net *net,
161 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200162 const struct in6_addr *saddr, __be16 sport,
163 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700164 int dif)
165{
Joe Perches60c04ae2014-12-01 20:29:06 -0800166 int score;
167 struct inet_sock *inet;
Eric Dumazet645ca702008-10-29 01:41:45 -0700168
Joe Perches60c04ae2014-12-01 20:29:06 -0800169 if (!net_eq(sock_net(sk), net) ||
170 udp_sk(sk)->udp_port_hash != hnum ||
171 sk->sk_family != PF_INET6)
172 return -1;
Eric Dumazet645ca702008-10-29 01:41:45 -0700173
Joe Perches60c04ae2014-12-01 20:29:06 -0800174 score = 0;
175 inet = inet_sk(sk);
176
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
Eric Dumazet645ca702008-10-29 01:41:45 -0700181 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800182
183 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
184 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
185 return -1;
186 score++;
187 }
188
189 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
190 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
191 return -1;
192 score++;
193 }
194
195 if (sk->sk_bound_dev_if) {
196 if (sk->sk_bound_dev_if != dif)
197 return -1;
198 score++;
199 }
200
Eric Dumazet70da2682015-10-08 19:33:21 -0700201 if (sk->sk_incoming_cpu == raw_smp_processor_id())
202 score++;
203
Eric Dumazet645ca702008-10-29 01:41:45 -0700204 return score;
205}
206
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000207static inline int compute_score2(struct sock *sk, struct net *net,
Joe Perches60c04ae2014-12-01 20:29:06 -0800208 const struct in6_addr *saddr, __be16 sport,
209 const struct in6_addr *daddr,
210 unsigned short hnum, int dif)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000211{
Joe Perches60c04ae2014-12-01 20:29:06 -0800212 int score;
213 struct inet_sock *inet;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000214
Joe Perches60c04ae2014-12-01 20:29:06 -0800215 if (!net_eq(sock_net(sk), net) ||
216 udp_sk(sk)->udp_port_hash != hnum ||
217 sk->sk_family != PF_INET6)
218 return -1;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000219
Joe Perches60c04ae2014-12-01 20:29:06 -0800220 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
221 return -1;
222
223 score = 0;
224 inet = inet_sk(sk);
225
226 if (inet->inet_dport) {
227 if (inet->inet_dport != sport)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000228 return -1;
Joe Perches60c04ae2014-12-01 20:29:06 -0800229 score++;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000230 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800231
232 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
233 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
234 return -1;
235 score++;
236 }
237
238 if (sk->sk_bound_dev_if) {
239 if (sk->sk_bound_dev_if != dif)
240 return -1;
241 score++;
242 }
243
Eric Dumazet70da2682015-10-08 19:33:21 -0700244 if (sk->sk_incoming_cpu == raw_smp_processor_id())
245 score++;
246
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000247 return score;
248}
249
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000250/* called with read_rcu_lock() */
251static struct sock *udp6_lib_lookup2(struct net *net,
252 const struct in6_addr *saddr, __be16 sport,
253 const struct in6_addr *daddr, unsigned int hnum, int dif,
Craig Gallek11341582016-01-05 15:08:07 -0500254 struct udp_hslot *hslot2, unsigned int slot2,
255 struct sk_buff *skb)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000256{
257 struct sock *sk, *result;
258 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000259 int score, badness, matches = 0, reuseport = 0;
260 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000261
262begin:
263 result = NULL;
264 badness = -1;
265 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
266 score = compute_score2(sk, net, saddr, sport,
267 daddr, hnum, dif);
268 if (score > badness) {
269 result = sk;
270 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000271 reuseport = sk->sk_reuseport;
272 if (reuseport) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500273 struct sock *sk2;
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200274 hash = udp6_ehashfn(net, daddr, hnum,
275 saddr, sport);
Craig Gallek11341582016-01-05 15:08:07 -0500276 sk2 = reuseport_select_sock(sk, hash, skb,
277 sizeof(struct udphdr));
Craig Galleke32ea7e2016-01-04 17:41:46 -0500278 if (sk2) {
279 result = sk2;
280 goto found;
281 }
Tom Herbert72289b92013-01-22 09:50:44 +0000282 matches = 1;
Eric Dumazet70da2682015-10-08 19:33:21 -0700283 }
Tom Herbert72289b92013-01-22 09:50:44 +0000284 } else if (score == badness && reuseport) {
285 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200286 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000287 result = sk;
288 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000289 }
290 }
291 /*
292 * if the nulls value we got at the end of this lookup is
293 * not the expected one, we must restart lookup.
294 * We probably met an item that was moved to another chain.
295 */
296 if (get_nulls_value(node) != slot2)
297 goto begin;
298
299 if (result) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500300found:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000301 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000302 result = NULL;
303 else if (unlikely(compute_score2(result, net, saddr, sport,
304 daddr, hnum, dif) < badness)) {
305 sock_put(result);
306 goto begin;
307 }
308 }
309 return result;
310}
311
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000312struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200313 const struct in6_addr *saddr, __be16 sport,
314 const struct in6_addr *daddr, __be16 dport,
Craig Gallek538950a2016-01-04 17:41:47 -0500315 int dif, struct udp_table *udptable,
316 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700318 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800319 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000321 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
322 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000323 int score, badness, matches = 0, reuseport = 0;
324 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Eric Dumazet271b72c2008-10-29 02:11:14 -0700326 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000327 if (hslot->count > 10) {
328 hash2 = udp6_portaddr_hash(net, daddr, hnum);
329 slot2 = hash2 & udptable->mask;
330 hslot2 = &udptable->hash2[slot2];
331 if (hslot->count < hslot2->count)
332 goto begin;
333
334 result = udp6_lib_lookup2(net, saddr, sport,
335 daddr, hnum, dif,
Craig Gallek11341582016-01-05 15:08:07 -0500336 hslot2, slot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000337 if (!result) {
338 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
339 slot2 = hash2 & udptable->mask;
340 hslot2 = &udptable->hash2[slot2];
341 if (hslot->count < hslot2->count)
342 goto begin;
343
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000344 result = udp6_lib_lookup2(net, saddr, sport,
345 &in6addr_any, hnum, dif,
Craig Gallek11341582016-01-05 15:08:07 -0500346 hslot2, slot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000347 }
348 rcu_read_unlock();
349 return result;
350 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700351begin:
352 result = NULL;
353 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800354 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700355 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
356 if (score > badness) {
357 result = sk;
358 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000359 reuseport = sk->sk_reuseport;
360 if (reuseport) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500361 struct sock *sk2;
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200362 hash = udp6_ehashfn(net, daddr, hnum,
363 saddr, sport);
Craig Gallek538950a2016-01-04 17:41:47 -0500364 sk2 = reuseport_select_sock(sk, hash, skb,
365 sizeof(struct udphdr));
Craig Galleke32ea7e2016-01-04 17:41:46 -0500366 if (sk2) {
367 result = sk2;
368 goto found;
369 }
Tom Herbert72289b92013-01-22 09:50:44 +0000370 matches = 1;
371 }
372 } else if (score == badness && reuseport) {
373 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200374 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000375 result = sk;
376 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
378 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800379 /*
380 * if the nulls value we got at the end of this lookup is
381 * not the expected one, we must restart lookup.
382 * We probably met an item that was moved to another chain.
383 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000384 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800385 goto begin;
386
Eric Dumazet271b72c2008-10-29 02:11:14 -0700387 if (result) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500388found:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000389 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700390 result = NULL;
391 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
392 daddr, dport, dif) < badness)) {
393 sock_put(result);
394 goto begin;
395 }
396 }
397 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return result;
399}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000400EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700402static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
403 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700404 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700405{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700406 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000407 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700408
Ian Morrise5d08d72014-11-23 21:28:43 +0000409 sk = skb_steal_sock(skb);
410 if (unlikely(sk))
KOVACS Krisztian23542612008-10-07 12:41:01 -0700411 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000412 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
413 &iph->daddr, dport, inet6_iif(skb),
Craig Gallek538950a2016-01-04 17:41:47 -0500414 udptable, skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700415}
416
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200417struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
418 const struct in6_addr *daddr, __be16 dport, int dif)
419{
Craig Gallek538950a2016-01-04 17:41:47 -0500420 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200421}
422EXPORT_SYMBOL_GPL(udp6_lib_lookup);
423
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424/*
Ian Morris67ba4152014-08-24 21:53:10 +0100425 * This should be easy, if there is something there we
426 * return it, otherwise we block.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 */
428
Ying Xue1b784142015-03-02 15:37:48 +0800429int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 int noblock, int flags, int *addr_len)
431{
432 struct ipv6_pinfo *np = inet6_sk(sk);
433 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900434 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500435 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000436 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700437 int err;
438 int is_udplite = IS_UDPLITE(sk);
Eric Dumazet197c9492015-12-30 08:51:12 -0500439 bool checksum_valid = false;
Wei Yongjunf26ba172008-11-02 16:11:01 +0000440 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000441 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100444 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Brian Haley4b340ae2010-04-23 11:26:09 +0000446 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100447 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800450 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000451 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (!skb)
453 goto out;
454
Herbert Xu759e5d02007-03-25 20:10:56 -0700455 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500456 copied = len;
457 if (copied > ulen)
458 copied = ulen;
459 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900460 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Wei Yongjunf26ba172008-11-02 16:11:01 +0000462 is_udp4 = (skb->protocol == htons(ETH_P_IP));
463
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800464 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700465 * If checksum is needed at all, try to do it while copying the
466 * data. If the data is truncated, or if we only want a partial
467 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800468 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800469
David S. Miller59c2cda2011-12-01 14:12:55 -0500470 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Eric Dumazet197c9492015-12-30 08:51:12 -0500471 checksum_valid = !udp_lib_checksum_complete(skb);
472 if (!checksum_valid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800474 }
475
Eric Dumazet197c9492015-12-30 08:51:12 -0500476 if (checksum_valid || skb_csum_unnecessary(skb))
David S. Miller51f3d022014-11-05 16:46:40 -0500477 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
478 msg, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800479 else {
Al Viro227158d2014-04-06 18:47:38 -0400480 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (err == -EINVAL)
482 goto csum_copy_err;
483 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000484 if (unlikely(err)) {
485 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000486 if (!peeked) {
487 atomic_inc(&sk->sk_drops);
488 if (is_udp4)
489 UDP_INC_STATS_USER(sock_net(sk),
490 UDP_MIB_INERRORS,
491 is_udplite);
492 else
493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_INERRORS,
495 is_udplite);
496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000498 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000499 if (!peeked) {
500 if (is_udp4)
501 UDP_INC_STATS_USER(sock_net(sk),
502 UDP_MIB_INDATAGRAMS, is_udplite);
503 else
504 UDP6_INC_STATS_USER(sock_net(sk),
505 UDP_MIB_INDATAGRAMS, is_udplite);
506 }
Wang Chencb759942007-12-03 22:33:28 +1100507
Neil Horman3b885782009-10-12 13:26:31 -0700508 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 /* Copy the address. */
511 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100512 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300514 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000517 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700518 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
519 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000520 sin6->sin6_scope_id = 0;
521 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000522 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000523 sin6->sin6_scope_id =
524 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800525 inet6_iif(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100527 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100529
530 if (np->rxopt.all)
531 ip6_datagram_recv_common_ctl(sk, msg, skb);
532
Wei Yongjunf26ba172008-11-02 16:11:01 +0000533 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 if (inet->cmsg_flags)
535 ip_cmsg_recv(msg, skb);
536 } else {
537 if (np->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100538 ip6_datagram_recv_specific_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900539 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
David S. Miller59c2cda2011-12-01 14:12:55 -0500541 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700543 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000546 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547out:
548 return err;
549
550csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000551 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000552 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000553 if (is_udp4) {
554 UDP_INC_STATS_USER(sock_net(sk),
555 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000556 UDP_INC_STATS_USER(sock_net(sk),
557 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000558 } else {
559 UDP6_INC_STATS_USER(sock_net(sk),
560 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000561 UDP6_INC_STATS_USER(sock_net(sk),
562 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000563 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000564 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000565 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Eric Dumazetbeb39db2015-05-30 09:16:53 -0700567 /* starting over for a new packet, but check if we need to yield */
568 cond_resched();
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000569 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 goto try_again;
571}
572
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800573void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700574 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700575 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
577 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000578 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
579 const struct in6_addr *saddr = &hdr->saddr;
580 const struct in6_addr *daddr = &hdr->daddr;
Ian Morris67ba4152014-08-24 21:53:10 +0100581 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 struct sock *sk;
583 int err;
Duan Jiong7304fe42014-07-31 17:54:32 +0800584 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Craig Galleke32ea7e2016-01-04 17:41:46 -0500586 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
Craig Gallek538950a2016-01-04 17:41:47 -0500587 inet6_iif(skb), udptable, skb);
Ian Morris63159f22015-03-29 14:00:04 +0100588 if (!sk) {
Duan Jiong7304fe42014-07-31 17:54:32 +0800589 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
590 ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 return;
Duan Jiong7304fe42014-07-31 17:54:32 +0800592 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100594 if (type == ICMPV6_PKT_TOOBIG) {
595 if (!ip6_sk_accept_pmtu(sk))
596 goto out;
David S. Miller81aded22012-06-15 14:54:11 -0700597 ip6_sk_update_pmtu(skb, sk, info);
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100598 }
Duan Jiong1a462d12013-09-20 18:20:28 +0800599 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700600 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800601 goto out;
602 }
David S. Miller81aded22012-06-15 14:54:11 -0700603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 np = inet6_sk(sk);
605
606 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
607 goto out;
608
609 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
610 goto out;
611
Eric Dumazetb1faf562010-05-31 23:44:05 -0700612 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 sk->sk_err = err;
616 sk->sk_error_report(sk);
617out:
618 sock_put(sk);
619}
620
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000621static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
622{
623 int rc;
624
Eric Dumazetefe42082013-10-03 15:42:29 -0700625 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000626 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500627 sk_mark_napi_id(sk, skb);
Eric Dumazet2c8c56e2014-11-11 05:54:28 -0800628 sk_incoming_cpu_update(sk);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500629 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000630
631 rc = sock_queue_rcv_skb(sk, skb);
632 if (rc < 0) {
633 int is_udplite = IS_UDPLITE(sk);
634
635 /* Note that an ENOMEM error is charged twice */
636 if (rc == -ENOMEM)
637 UDP6_INC_STATS_BH(sock_net(sk),
638 UDP_MIB_RCVBUFERRORS, is_udplite);
639 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
640 kfree_skb(skb);
641 return -1;
642 }
643 return 0;
644}
645
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800646static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700647 struct inet6_skb_parm *opt, u8 type,
Ian Morris67ba4152014-08-24 21:53:10 +0100648 u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
Eric Dumazet645ca702008-10-29 01:41:45 -0700650 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800651}
652
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000653static struct static_key udpv6_encap_needed __read_mostly;
654void udpv6_encap_enable(void)
655{
656 if (!static_key_enabled(&udpv6_encap_needed))
657 static_key_slow_inc(&udpv6_encap_needed);
658}
659EXPORT_SYMBOL(udpv6_encap_enable);
660
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000661int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800662{
663 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700664 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100665 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700666
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800667 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
668 goto drop;
669
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000670 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
671 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
672
673 /*
674 * This is an encapsulation socket so pass the skb to
675 * the socket's udp_encap_rcv() hook. Otherwise, just
676 * fall through and pass this up the UDP socket.
677 * up->encap_rcv() returns the following value:
678 * =0 if skb was successfully passed to the encap
679 * handler or was discarded by it.
680 * >0 if skb should be passed on to UDP.
681 * <0 if skb should be resubmitted as proto -N
682 */
683
684 /* if we're overly short, let UDP handle it */
685 encap_rcv = ACCESS_ONCE(up->encap_rcv);
Ian Morris53b24b82015-03-29 14:00:05 +0100686 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000687 int ret;
688
Tom Herbert0a809662014-05-07 16:52:39 -0700689 /* Verify checksum before giving to encap */
690 if (udp_lib_checksum_complete(skb))
691 goto csum_error;
692
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000693 ret = encap_rcv(sk, skb);
694 if (ret <= 0) {
695 UDP_INC_STATS_BH(sock_net(sk),
696 UDP_MIB_INDATAGRAMS,
697 is_udplite);
698 return -ret;
699 }
700 }
701
702 /* FALLTHROUGH -- it's a UDP Packet */
703 }
704
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800705 /*
706 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
707 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100708 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800709
710 if (up->pcrlen == 0) { /* full coverage was set */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800711 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
712 UDP_SKB_CB(skb)->cscov, skb->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800713 goto drop;
714 }
715 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800716 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
717 UDP_SKB_CB(skb)->cscov, up->pcrlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800718 goto drop;
719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 }
721
Eric Dumazet33d480c2011-08-11 19:30:52 +0000722 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800723 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000724 goto csum_error;
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800725 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
Sorin Dumitru274f4822014-07-22 21:16:51 +0300727 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
James M Leddy3e215c82014-06-25 17:38:13 -0400728 UDP6_INC_STATS_BH(sock_net(sk),
729 UDP_MIB_RCVBUFERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000730 goto drop;
James M Leddy3e215c82014-06-25 17:38:13 -0400731 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000732
Eric Dumazetd826eb12011-11-09 07:24:35 +0000733 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100734
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000735 bh_lock_sock(sk);
736 rc = 0;
737 if (!sock_owned_by_user(sk))
738 rc = __udpv6_queue_rcv_skb(sk, skb);
739 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
740 bh_unlock_sock(sk);
741 goto drop;
742 }
743 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000744
745 return rc;
James M Leddy3e215c82014-06-25 17:38:13 -0400746
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000747csum_error:
748 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800749drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700750 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000751 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800752 kfree_skb(skb);
753 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
David Held5cf3d462014-07-15 23:28:31 -0400756static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
757 __be16 loc_port, const struct in6_addr *loc_addr,
758 __be16 rmt_port, const struct in6_addr *rmt_addr,
759 int dif, unsigned short hnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760{
David Held5cf3d462014-07-15 23:28:31 -0400761 struct inet_sock *inet = inet_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
David Held5cf3d462014-07-15 23:28:31 -0400763 if (!net_eq(sock_net(sk), net))
764 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
David Held5cf3d462014-07-15 23:28:31 -0400766 if (udp_sk(sk)->udp_port_hash != hnum ||
767 sk->sk_family != PF_INET6 ||
768 (inet->inet_dport && inet->inet_dport != rmt_port) ||
769 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
770 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
Henning Rogge33b4b012015-05-18 21:08:49 +0200771 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
772 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
773 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
David Held5cf3d462014-07-15 23:28:31 -0400774 return false;
775 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
776 return false;
777 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000780static void flush_stack(struct sock **stack, unsigned int count,
781 struct sk_buff *skb, unsigned int final)
782{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000783 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000784 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000785 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000786
787 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000788 sk = stack[i];
Ian Morris63159f22015-03-29 14:00:04 +0100789 if (likely(!skb1))
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000790 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
791 if (!skb1) {
792 atomic_inc(&sk->sk_drops);
793 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
794 IS_UDPLITE(sk));
795 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
796 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000797 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000798
799 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
800 skb1 = NULL;
David Held2dc41cf2014-07-15 23:28:32 -0400801 sock_put(sk);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000802 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000803 if (unlikely(skb1))
804 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000805}
Tom Herbert40685792014-05-02 16:29:58 -0700806
807static void udp6_csum_zero_error(struct sk_buff *skb)
808{
809 /* RFC 2460 section 8.1 says that we SHOULD log
810 * this error. Well, it is reasonable.
811 */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800812 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
813 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
814 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
Tom Herbert40685792014-05-02 16:29:58 -0700815}
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817/*
818 * Note: called only from the BH handler context,
819 * so we don't need to lock the hashes.
820 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700821static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000822 const struct in6_addr *saddr, const struct in6_addr *daddr,
Rick Jones36cbb242014-11-06 10:37:54 -0800823 struct udp_table *udptable, int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000825 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300826 const struct udphdr *uh = udp_hdr(skb);
David Held5cf3d462014-07-15 23:28:31 -0400827 struct hlist_nulls_node *node;
828 unsigned short hnum = ntohs(uh->dest);
829 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
830 int dif = inet6_iif(skb);
David Held2dc41cf2014-07-15 23:28:32 -0400831 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
832 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
Rick Jones36cbb242014-11-06 10:37:54 -0800833 bool inner_flushed = false;
David Held2dc41cf2014-07-15 23:28:32 -0400834
835 if (use_hash2) {
836 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
837 udp_table.mask;
838 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
839start_lookup:
840 hslot = &udp_table.hash2[hash2];
841 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
842 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Eric Dumazet645ca702008-10-29 01:41:45 -0700844 spin_lock(&hslot->lock);
David Held2dc41cf2014-07-15 23:28:32 -0400845 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
David Held5cf3d462014-07-15 23:28:31 -0400846 if (__udp_v6_is_mcast_sock(net, sk,
847 uh->dest, daddr,
848 uh->source, saddr,
849 dif, hnum) &&
850 /* If zero checksum and no_check is not on for
851 * the socket then skip it.
852 */
853 (uh->check || udp_sk(sk)->no_check6_rx)) {
854 if (unlikely(count == ARRAY_SIZE(stack))) {
855 flush_stack(stack, count, skb, ~0);
Rick Jones36cbb242014-11-06 10:37:54 -0800856 inner_flushed = true;
David Held5cf3d462014-07-15 23:28:31 -0400857 count = 0;
858 }
Tom Herbert40685792014-05-02 16:29:58 -0700859 stack[count++] = sk;
David Held2dc41cf2014-07-15 23:28:32 -0400860 sock_hold(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800861 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000863
Eric Dumazet645ca702008-10-29 01:41:45 -0700864 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000865
David Held2dc41cf2014-07-15 23:28:32 -0400866 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
867 if (use_hash2 && hash2 != hash2_any) {
868 hash2 = hash2_any;
869 goto start_lookup;
870 }
871
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000872 if (count) {
873 flush_stack(stack, count, skb, count - 1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000874 } else {
Rick Jones36cbb242014-11-06 10:37:54 -0800875 if (!inner_flushed)
876 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
877 proto == IPPROTO_UDPLITE);
878 consume_skb(skb);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000879 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800880 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881}
882
Eric Dumazet645ca702008-10-29 01:41:45 -0700883int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700884 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000886 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900888 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000889 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 u32 ulen = 0;
891
892 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000893 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700895 saddr = &ipv6_hdr(skb)->saddr;
896 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300897 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800900 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 goto short_packet;
902
Herbert Xu759e5d02007-03-25 20:10:56 -0700903 if (proto == IPPROTO_UDP) {
904 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800906 /* Check for jumbo payload */
907 if (ulen == 0)
908 ulen = skb->len;
909
910 if (ulen < sizeof(*uh))
911 goto short_packet;
912
913 if (ulen < skb->len) {
914 if (pskb_trim_rcsum(skb, ulen))
915 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700916 saddr = &ipv6_hdr(skb)->saddr;
917 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300918 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 }
921
Herbert Xu759e5d02007-03-25 20:10:56 -0700922 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000923 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700924
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900925 /*
926 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800928 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700929 return __udp6_lib_mcast_deliver(net, skb,
Rick Jones36cbb242014-11-06 10:37:54 -0800930 saddr, daddr, udptable, proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
932 /* Unicast */
933
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900934 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 * check socket cache ... must talk to Alan about his plans
936 * for sock caches... i'll skip this for now.
937 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700938 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Ian Morris53b24b82015-03-29 14:00:05 +0100939 if (sk) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300940 int ret;
941
Tom Herbert1c194482014-05-23 08:47:32 -0700942 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
Tom Herbert79e0f1c2014-05-05 16:43:58 -0700943 sock_put(sk);
Tom Herbert40685792014-05-02 16:29:58 -0700944 udp6_csum_zero_error(skb);
945 goto csum_error;
946 }
947
Tom Herbert224d0192015-01-05 13:56:14 -0800948 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
Tom Herbert2abb7cd2014-08-31 15:12:43 -0700949 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
950 ip6_compute_pseudo);
951
Eliezer Tamira5b50472013-06-10 11:40:00 +0300952 ret = udpv6_queue_rcv_skb(sk, skb);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000953 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000955 /* a return value > 0 means to resubmit the input, but
956 * it wants the return to be -protocol, or 0
957 */
958 if (ret > 0)
959 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800961 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900963
Tom Herbert40685792014-05-02 16:29:58 -0700964 if (!uh->check) {
965 udp6_csum_zero_error(skb);
966 goto csum_error;
967 }
968
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000969 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
970 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900971
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000972 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000973 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000974
975 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
976 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
977
978 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800979 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900981short_packet:
Joe Perchesba7a46f2014-11-11 10:59:17 -0800982 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
983 proto == IPPROTO_UDPLITE ? "-Lite" : "",
984 saddr, ntohs(uh->source),
985 ulen, skb->len,
986 daddr, ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000987 goto discard;
988csum_error:
989 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700991 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800993 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800995
Herbert Xue5bbef22007-10-15 12:50:28 -0700996static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800997{
Eric Dumazet645ca702008-10-29 01:41:45 -0700998 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800999}
1000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001/*
1002 * Throw away all pending data and cancel the corking. Socket is locked.
1003 */
1004static void udp_v6_flush_pending_frames(struct sock *sk)
1005{
1006 struct udp_sock *up = udp_sk(sk);
1007
Denis V. Lunev36d926b2008-06-04 15:49:07 +04001008 if (up->pending == AF_INET)
1009 udp_flush_pending_frames(sk);
1010 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 up->len = 0;
1012 up->pending = 0;
1013 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001014 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015}
1016
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001017/**
Ian Morris67ba4152014-08-24 21:53:10 +01001018 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1019 * @sk: socket we are sending on
1020 * @skb: sk_buff containing the filled-in UDP header
1021 * (checksum field must be zeroed out)
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001022 */
1023static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1024 const struct in6_addr *saddr,
1025 const struct in6_addr *daddr, int len)
1026{
1027 unsigned int offset;
1028 struct udphdr *uh = udp_hdr(skb);
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001029 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001030 __wsum csum = 0;
1031
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001032 if (!frags) {
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001033 /* Only one fragment on the socket. */
1034 skb->csum_start = skb_transport_header(skb) - skb->head;
1035 skb->csum_offset = offsetof(struct udphdr, check);
1036 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1037 } else {
1038 /*
1039 * HW-checksum won't work as there are two or more
1040 * fragments on the socket so that all csums of sk_buffs
1041 * should be together
1042 */
1043 offset = skb_transport_offset(skb);
1044 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1045
1046 skb->ip_summed = CHECKSUM_NONE;
1047
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001048 do {
1049 csum = csum_add(csum, frags->csum);
1050 } while ((frags = frags->next));
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001051
1052 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1053 csum);
1054 if (uh->check == 0)
1055 uh->check = CSUM_MANGLED_0;
1056 }
1057}
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059/*
1060 * Sending
1061 */
1062
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001063static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064{
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001065 struct sock *sk = skb->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001068 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -08001069 __wsum csum = 0;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001070 int offset = skb_transport_offset(skb);
1071 int len = skb->len - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
1073 /*
1074 * Create a UDP header
1075 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001076 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -05001077 uh->source = fl6->fl6_sport;
1078 uh->dest = fl6->fl6_dport;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001079 uh->len = htons(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 uh->check = 0;
1081
Wang Chenb2bf1e22007-12-03 22:34:16 +11001082 if (is_udplite)
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001083 csum = udplite_csum(skb);
1084 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
Tom Herbert40685792014-05-02 16:29:58 -07001085 skb->ip_summed = CHECKSUM_NONE;
1086 goto send;
1087 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001088 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001089 goto send;
1090 } else
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001091 csum = udp_csum(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001093 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001094 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001095 len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001097 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001099send:
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001100 err = ip6_send_skb(skb);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001101 if (err) {
1102 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1103 UDP6_INC_STATS_USER(sock_net(sk),
1104 UDP_MIB_SNDBUFERRORS, is_udplite);
1105 err = 0;
1106 }
1107 } else
1108 UDP6_INC_STATS_USER(sock_net(sk),
1109 UDP_MIB_OUTDATAGRAMS, is_udplite);
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001110 return err;
1111}
1112
1113static int udp_v6_push_pending_frames(struct sock *sk)
1114{
1115 struct sk_buff *skb;
1116 struct udp_sock *up = udp_sk(sk);
1117 struct flowi6 fl6;
1118 int err = 0;
1119
1120 if (up->pending == AF_INET)
1121 return udp_push_pending_frames(sk);
1122
1123 /* ip6_finish_skb will release the cork, so make a copy of
1124 * fl6 here.
1125 */
1126 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1127
1128 skb = ip6_finish_skb(sk);
1129 if (!skb)
1130 goto out;
1131
1132 err = udp_v6_send_skb(skb, &fl6);
1133
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134out:
1135 up->len = 0;
1136 up->pending = 0;
1137 return err;
1138}
1139
Ying Xue1b784142015-03-02 15:37:48 +08001140int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
1142 struct ipv6_txoptions opt_space;
1143 struct udp_sock *up = udp_sk(sk);
1144 struct inet_sock *inet = inet_sk(sk);
1145 struct ipv6_pinfo *np = inet6_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001146 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001147 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 struct ipv6_txoptions *opt = NULL;
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001149 struct ipv6_txoptions *opt_to_free = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001151 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 struct dst_entry *dst;
1153 int addr_len = msg->msg_namelen;
1154 int ulen = len;
1155 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001156 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001157 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1159 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001160 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001161 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001162 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
1164 /* destination address check */
1165 if (sin6) {
1166 if (addr_len < offsetof(struct sockaddr, sa_data))
1167 return -EINVAL;
1168
1169 switch (sin6->sin6_family) {
1170 case AF_INET6:
1171 if (addr_len < SIN6_LEN_RFC2133)
1172 return -EINVAL;
1173 daddr = &sin6->sin6_addr;
1174 break;
1175 case AF_INET:
1176 goto do_udp_sendmsg;
1177 case AF_UNSPEC:
1178 msg->msg_name = sin6 = NULL;
1179 msg->msg_namelen = addr_len = 0;
1180 daddr = NULL;
1181 break;
1182 default:
1183 return -EINVAL;
1184 }
1185 } else if (!up->pending) {
1186 if (sk->sk_state != TCP_ESTABLISHED)
1187 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001188 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001189 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 daddr = NULL;
1191
1192 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001193 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 struct sockaddr_in sin;
1195 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001196 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1198 msg->msg_name = &sin;
1199 msg->msg_namelen = sizeof(sin);
1200do_udp_sendmsg:
1201 if (__ipv6_only_sock(sk))
1202 return -ENETUNREACH;
Ying Xue1b784142015-03-02 15:37:48 +08001203 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 }
1205 }
1206
1207 if (up->pending == AF_INET)
Ying Xue1b784142015-03-02 15:37:48 +08001208 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
1210 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001211 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 */
1213 if (len > INT_MAX - sizeof(struct udphdr))
1214 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001215
Vlad Yasevich03485f22015-01-31 10:40:17 -05001216 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 if (up->pending) {
1218 /*
1219 * There are pending frames.
1220 * The socket lock must be held while it's corked.
1221 */
1222 lock_sock(sk);
1223 if (likely(up->pending)) {
1224 if (unlikely(up->pending != AF_INET6)) {
1225 release_sock(sk);
1226 return -EAFNOSUPPORT;
1227 }
1228 dst = NULL;
1229 goto do_append_data;
1230 }
1231 release_sock(sk);
1232 }
1233 ulen += sizeof(struct udphdr);
1234
David S. Miller4c9483b2011-03-12 16:22:43 -05001235 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
1237 if (sin6) {
1238 if (sin6->sin6_port == 0)
1239 return -EINVAL;
1240
David S. Miller1958b852011-03-12 16:36:19 -05001241 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 daddr = &sin6->sin6_addr;
1243
1244 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001245 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1246 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1247 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001248 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251 }
1252
1253 /*
1254 * Otherwise it will be difficult to maintain
1255 * sk->sk_dst_cache.
1256 */
1257 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001258 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1259 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
1261 if (addr_len >= sizeof(struct sockaddr_in6) &&
1262 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001263 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001264 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 } else {
1266 if (sk->sk_state != TCP_ESTABLISHED)
1267 return -EDESTADDRREQ;
1268
David S. Miller1958b852011-03-12 16:36:19 -05001269 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001270 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001271 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001272 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 }
1274
David S. Miller4c9483b2011-03-12 16:22:43 -05001275 if (!fl6.flowi6_oif)
1276 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
David S. Miller4c9483b2011-03-12 16:22:43 -05001278 if (!fl6.flowi6_oif)
1279 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001280
David S. Miller4c9483b2011-03-12 16:22:43 -05001281 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 if (msg->msg_controllen) {
1284 opt = &opt_space;
1285 memset(opt, 0, sizeof(struct ipv6_txoptions));
1286 opt->tot_len = sizeof(*opt);
1287
Tom Parkin73df66f2013-01-31 01:02:24 +00001288 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1289 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 if (err < 0) {
1291 fl6_sock_release(flowlabel);
1292 return err;
1293 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001294 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1295 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001296 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 return -EINVAL;
1298 }
1299 if (!(opt->opt_nflen|opt->opt_flen))
1300 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001301 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 }
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001303 if (!opt) {
1304 opt = txopt_get(np);
1305 opt_to_free = opt;
1306 }
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001307 if (flowlabel)
1308 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1309 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
David S. Miller4c9483b2011-03-12 16:22:43 -05001311 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001312 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001313 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001314 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001315 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1316 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001317 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001318 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001319
David S. Miller4c9483b2011-03-12 16:22:43 -05001320 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001321 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001322 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
David S. Miller4c9483b2011-03-12 16:22:43 -05001324 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1325 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001326 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001327 } else if (!fl6.flowi6_oif)
1328 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
David S. Miller4c9483b2011-03-12 16:22:43 -05001330 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001331
Steffen Klassert0e0d44a2013-08-28 08:04:14 +02001332 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001333 if (IS_ERR(dst)) {
1334 err = PTR_ERR(dst);
1335 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001337 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Lorenzo Colitti5c986312014-04-29 11:57:34 +09001339 if (hlimit < 0)
1340 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
Gerrit Renkere651f032009-08-09 08:12:48 +00001342 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001343 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 if (msg->msg_flags&MSG_CONFIRM)
1346 goto do_confirm;
1347back_from_confirm:
1348
Vlad Yasevich03485f22015-01-31 10:40:17 -05001349 /* Lockless fast path for the non-corking case */
1350 if (!corkreq) {
1351 struct sk_buff *skb;
1352
1353 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1354 sizeof(struct udphdr), hlimit, tclass, opt,
1355 &fl6, (struct rt6_info *)dst,
1356 msg->msg_flags, dontfrag);
1357 err = PTR_ERR(skb);
1358 if (!IS_ERR_OR_NULL(skb))
1359 err = udp_v6_send_skb(skb, &fl6);
1360 goto release_dst;
1361 }
1362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 lock_sock(sk);
1364 if (unlikely(up->pending)) {
1365 /* The socket is already corked while preparing it. */
1366 /* ... which is an evident application bug. --ANK */
1367 release_sock(sk);
1368
Joe Perchesba7a46f2014-11-11 10:59:17 -08001369 net_dbg_ratelimited("udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 err = -EINVAL;
1371 goto out;
1372 }
1373
1374 up->pending = AF_INET6;
1375
1376do_append_data:
Jiri Pirkoe36d3ff2013-10-19 12:29:15 +02001377 if (dontfrag < 0)
1378 dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 up->len += ulen;
Al Virof69e6d12014-11-24 13:23:40 -05001380 err = ip6_append_data(sk, getfrag, msg, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001381 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
Ian Morris67ba4152014-08-24 21:53:10 +01001382 (struct rt6_info *)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001383 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 if (err)
1385 udp_v6_flush_pending_frames(sk);
1386 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001387 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001388 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1389 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Vlad Yasevich03485f22015-01-31 10:40:17 -05001391 if (err > 0)
1392 err = np->recverr ? net_xmit_errno(err) : 0;
1393 release_sock(sk);
1394
1395release_dst:
David S. Millera5e7c212005-10-03 14:21:58 -07001396 if (dst) {
1397 if (connected) {
1398 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001399 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1400 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001401#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001402 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001403 &np->saddr :
1404#endif
1405 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001406 } else {
1407 dst_release(dst);
1408 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001409 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001410 }
1411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001413 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 fl6_sock_release(flowlabel);
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001415 txopt_put(opt_to_free);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001416 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001418 /*
1419 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1420 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1421 * we don't have a good statistic (IpOutDiscards but it can be too many
1422 * things). We could add another new stat but at least for now that
1423 * seems like overkill.
1424 */
1425 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001426 UDP6_INC_STATS_USER(sock_net(sk),
1427 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 return err;
1430
1431do_confirm:
1432 dst_confirm(dst);
1433 if (!(msg->msg_flags&MSG_PROBE) || len)
1434 goto back_from_confirm;
1435 err = 0;
1436 goto out;
1437}
1438
Brian Haley7d06b2e2008-06-14 17:04:49 -07001439void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440{
Tom Parkin44046a52013-03-19 06:11:12 +00001441 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 lock_sock(sk);
1443 udp_v6_flush_pending_frames(sk);
1444 release_sock(sk);
1445
Tom Parkin44046a52013-03-19 06:11:12 +00001446 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1447 void (*encap_destroy)(struct sock *sk);
1448 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1449 if (encap_destroy)
1450 encap_destroy(sk);
1451 }
1452
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454}
1455
1456/*
1457 * Socket option code for UDP
1458 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001459int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001460 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001461{
David S. Millerdb8dac22008-03-06 16:22:02 -08001462 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001463 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1464 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001465 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001466}
1467
1468#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001469int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001470 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001471{
David S. Millerdb8dac22008-03-06 16:22:02 -08001472 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001473 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1474 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001475 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001476}
1477#endif
1478
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001479int udpv6_getsockopt(struct sock *sk, int level, int optname,
1480 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001481{
David S. Millerdb8dac22008-03-06 16:22:02 -08001482 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001483 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001484 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001485}
1486
1487#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001488int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1489 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001490{
David S. Millerdb8dac22008-03-06 16:22:02 -08001491 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001492 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001493 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001494}
1495#endif
1496
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001497static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 .handler = udpv6_rcv,
1499 .err_handler = udpv6_err,
1500 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1501};
1502
1503/* ------------------------------------------------------------------------ */
1504#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001505int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001507 if (v == SEQ_START_TOKEN) {
1508 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1509 } else {
1510 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1511 struct inet_sock *inet = inet_sk(v);
1512 __u16 srcp = ntohs(inet->inet_sport);
1513 __u16 destp = ntohs(inet->inet_dport);
1514 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1515 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 return 0;
1517}
1518
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001519static const struct file_operations udp6_afinfo_seq_fops = {
1520 .owner = THIS_MODULE,
1521 .open = udp_seq_open,
1522 .read = seq_read,
1523 .llseek = seq_lseek,
1524 .release = seq_release_net
1525};
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 .name = "udp6",
1529 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001530 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001531 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001532 .seq_ops = {
1533 .show = udp6_seq_show,
1534 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535};
1536
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001537int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001539 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540}
1541
Ian Morrisec120da2015-08-14 22:43:38 +01001542void udp6_proc_exit(struct net *net)
1543{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001544 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545}
1546#endif /* CONFIG_PROC_FS */
1547
Eric Dumazetf77d6022013-05-09 10:28:16 +00001548void udp_v6_clear_sk(struct sock *sk, int size)
1549{
1550 struct inet_sock *inet = inet_sk(sk);
1551
1552 /* we do not want to clear pinet6 field, because of RCU lookups */
1553 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1554
1555 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1556 memset(&inet->pinet6 + 1, 0, size);
1557}
1558
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559/* ------------------------------------------------------------------------ */
1560
1561struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001562 .name = "UDPv6",
1563 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001564 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001565 .connect = ip6_datagram_connect,
1566 .disconnect = udp_disconnect,
1567 .ioctl = udp_ioctl,
1568 .destroy = udpv6_destroy_sock,
1569 .setsockopt = udpv6_setsockopt,
1570 .getsockopt = udpv6_getsockopt,
1571 .sendmsg = udpv6_sendmsg,
1572 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001573 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001574 .hash = udp_lib_hash,
1575 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001576 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001577 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001578 .memory_allocated = &udp_memory_allocated,
1579 .sysctl_mem = sysctl_udp_mem,
1580 .sysctl_wmem = &sysctl_udp_wmem_min,
1581 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001582 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001583 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001584 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001585#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001586 .compat_setsockopt = compat_udpv6_setsockopt,
1587 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001588#endif
Eric Dumazetf77d6022013-05-09 10:28:16 +00001589 .clear_sk = udp_v6_clear_sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590};
1591
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592static struct inet_protosw udpv6_protosw = {
1593 .type = SOCK_DGRAM,
1594 .protocol = IPPROTO_UDP,
1595 .prot = &udpv6_prot,
1596 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 .flags = INET_PROTOSW_PERMANENT,
1598};
1599
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001600int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001602 int ret;
1603
Vlad Yasevich33362882012-11-15 08:49:15 +00001604 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1605 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001606 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001607
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001608 ret = inet6_register_protosw(&udpv6_protosw);
1609 if (ret)
1610 goto out_udpv6_protocol;
1611out:
1612 return ret;
1613
1614out_udpv6_protocol:
1615 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1616 goto out;
1617}
1618
Daniel Lezcano09f77092007-12-13 05:34:58 -08001619void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001620{
1621 inet6_unregister_protosw(&udpv6_protosw);
1622 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623}