blob: 0711f8fe4d44f52950a86c565df68cd61134953f [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
Craig Gallek496611d2016-02-10 11:50:36 -050040#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <net/ndisc.h>
42#include <net/protocol.h>
43#include <net/transp_v6.h>
44#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/raw.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070046#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <net/ip6_checksum.h>
48#include <net/xfrm.h>
Tom Herbert72289b92013-01-22 09:50:44 +000049#include <net/inet6_hashtables.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +030050#include <net/busy_poll.h>
Craig Galleke32ea7e2016-01-04 17:41:46 -050051#include <net/sock_reuseport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53#include <linux/proc_fs.h>
54#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000055#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080056#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Eric Dumazet6eada012015-03-18 14:05:33 -070058static u32 udp6_ehashfn(const struct net *net,
59 const struct in6_addr *laddr,
60 const u16 lport,
61 const struct in6_addr *faddr,
62 const __be16 fport)
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020063{
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020064 static u32 udp6_ehash_secret __read_mostly;
65 static u32 udp_ipv6_hash_secret __read_mostly;
66
67 u32 lhash, fhash;
68
69 net_get_random_once(&udp6_ehash_secret,
70 sizeof(udp6_ehash_secret));
71 net_get_random_once(&udp_ipv6_hash_secret,
72 sizeof(udp_ipv6_hash_secret));
73
74 lhash = (__force u32)laddr->s6_addr32[3];
75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
76
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020077 return __inet6_ehashfn(lhash, lport, fhash, fport,
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020078 udp_ipv6_hash_secret + net_hash_mix(net));
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020079}
80
Eric Dumazet6eada012015-03-18 14:05:33 -070081static u32 udp6_portaddr_hash(const struct net *net,
82 const struct in6_addr *addr6,
83 unsigned int port)
Eric Dumazetd4cada42009-11-08 10:17:30 +000084{
85 unsigned int hash, mix = net_hash_mix(net);
86
87 if (ipv6_addr_any(addr6))
88 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +000089 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -070090 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000091 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -070092 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000093
94 return hash ^ port;
95}
96
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -070097int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Eric Dumazet30fff922009-11-09 05:26:33 +000099 unsigned int hash2_nulladdr =
100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000101 unsigned int hash2_partial =
Eric Dumazetefe42082013-10-03 15:42:29 -0700102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
Eric Dumazet30fff922009-11-09 05:26:33 +0000103
Eric Dumazetd4cada42009-11-08 10:17:30 +0000104 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000105 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
Eric Dumazet719f8352010-09-08 05:08:44 +0000109static void udp_v6_rehash(struct sock *sk)
110{
111 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
Eric Dumazetefe42082013-10-03 15:42:29 -0700112 &sk->sk_v6_rcv_saddr,
Eric Dumazet719f8352010-09-08 05:08:44 +0000113 inet_sk(sk)->inet_num);
114
115 udp_lib_rehash(sk, new_hash);
116}
117
Eric Dumazet645ca702008-10-29 01:41:45 -0700118static inline int compute_score(struct sock *sk, struct net *net,
119 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200120 const struct in6_addr *saddr, __be16 sport,
121 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700122 int dif)
123{
Joe Perches60c04ae2014-12-01 20:29:06 -0800124 int score;
125 struct inet_sock *inet;
Eric Dumazet645ca702008-10-29 01:41:45 -0700126
Joe Perches60c04ae2014-12-01 20:29:06 -0800127 if (!net_eq(sock_net(sk), net) ||
128 udp_sk(sk)->udp_port_hash != hnum ||
129 sk->sk_family != PF_INET6)
130 return -1;
Eric Dumazet645ca702008-10-29 01:41:45 -0700131
Joe Perches60c04ae2014-12-01 20:29:06 -0800132 score = 0;
133 inet = inet_sk(sk);
134
135 if (inet->inet_dport) {
136 if (inet->inet_dport != sport)
137 return -1;
138 score++;
Eric Dumazet645ca702008-10-29 01:41:45 -0700139 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800140
141 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
143 return -1;
144 score++;
145 }
146
147 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
148 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
149 return -1;
150 score++;
151 }
152
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158
Eric Dumazet70da2682015-10-08 19:33:21 -0700159 if (sk->sk_incoming_cpu == raw_smp_processor_id())
160 score++;
161
Eric Dumazet645ca702008-10-29 01:41:45 -0700162 return score;
163}
164
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000165static inline int compute_score2(struct sock *sk, struct net *net,
Joe Perches60c04ae2014-12-01 20:29:06 -0800166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr,
168 unsigned short hnum, int dif)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000169{
Joe Perches60c04ae2014-12-01 20:29:06 -0800170 int score;
171 struct inet_sock *inet;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000172
Joe Perches60c04ae2014-12-01 20:29:06 -0800173 if (!net_eq(sock_net(sk), net) ||
174 udp_sk(sk)->udp_port_hash != hnum ||
175 sk->sk_family != PF_INET6)
176 return -1;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000177
Joe Perches60c04ae2014-12-01 20:29:06 -0800178 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
179 return -1;
180
181 score = 0;
182 inet = inet_sk(sk);
183
184 if (inet->inet_dport) {
185 if (inet->inet_dport != sport)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000186 return -1;
Joe Perches60c04ae2014-12-01 20:29:06 -0800187 score++;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000188 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800189
190 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
191 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
192 return -1;
193 score++;
194 }
195
196 if (sk->sk_bound_dev_if) {
197 if (sk->sk_bound_dev_if != dif)
198 return -1;
199 score++;
200 }
201
Eric Dumazet70da2682015-10-08 19:33:21 -0700202 if (sk->sk_incoming_cpu == raw_smp_processor_id())
203 score++;
204
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000205 return score;
206}
207
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000208/* called with read_rcu_lock() */
209static struct sock *udp6_lib_lookup2(struct net *net,
210 const struct in6_addr *saddr, __be16 sport,
211 const struct in6_addr *daddr, unsigned int hnum, int dif,
Craig Gallek11341582016-01-05 15:08:07 -0500212 struct udp_hslot *hslot2, unsigned int slot2,
213 struct sk_buff *skb)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000214{
215 struct sock *sk, *result;
216 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000217 int score, badness, matches = 0, reuseport = 0;
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800218 bool select_ok = true;
Tom Herbert72289b92013-01-22 09:50:44 +0000219 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000220
221begin:
222 result = NULL;
223 badness = -1;
224 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
225 score = compute_score2(sk, net, saddr, sport,
226 daddr, hnum, dif);
227 if (score > badness) {
228 result = sk;
229 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000230 reuseport = sk->sk_reuseport;
231 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200232 hash = udp6_ehashfn(net, daddr, hnum,
233 saddr, sport);
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800234 if (select_ok) {
235 struct sock *sk2;
236
237 sk2 = reuseport_select_sock(sk, hash, skb,
238 sizeof(struct udphdr));
239 if (sk2) {
240 result = sk2;
241 select_ok = false;
242 goto found;
243 }
Craig Galleke32ea7e2016-01-04 17:41:46 -0500244 }
Tom Herbert72289b92013-01-22 09:50:44 +0000245 matches = 1;
Eric Dumazet70da2682015-10-08 19:33:21 -0700246 }
Tom Herbert72289b92013-01-22 09:50:44 +0000247 } else if (score == badness && reuseport) {
248 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200249 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000250 result = sk;
251 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000252 }
253 }
254 /*
255 * if the nulls value we got at the end of this lookup is
256 * not the expected one, we must restart lookup.
257 * We probably met an item that was moved to another chain.
258 */
259 if (get_nulls_value(node) != slot2)
260 goto begin;
261
262 if (result) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500263found:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000264 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000265 result = NULL;
266 else if (unlikely(compute_score2(result, net, saddr, sport,
267 daddr, hnum, dif) < badness)) {
268 sock_put(result);
269 goto begin;
270 }
271 }
272 return result;
273}
274
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000275struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200276 const struct in6_addr *saddr, __be16 sport,
277 const struct in6_addr *daddr, __be16 dport,
Craig Gallek538950a2016-01-04 17:41:47 -0500278 int dif, struct udp_table *udptable,
279 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700281 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800282 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000284 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
285 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000286 int score, badness, matches = 0, reuseport = 0;
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800287 bool select_ok = true;
Tom Herbert72289b92013-01-22 09:50:44 +0000288 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Eric Dumazet271b72c2008-10-29 02:11:14 -0700290 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000291 if (hslot->count > 10) {
292 hash2 = udp6_portaddr_hash(net, daddr, hnum);
293 slot2 = hash2 & udptable->mask;
294 hslot2 = &udptable->hash2[slot2];
295 if (hslot->count < hslot2->count)
296 goto begin;
297
298 result = udp6_lib_lookup2(net, saddr, sport,
299 daddr, hnum, dif,
Craig Gallek11341582016-01-05 15:08:07 -0500300 hslot2, slot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000301 if (!result) {
302 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
303 slot2 = hash2 & udptable->mask;
304 hslot2 = &udptable->hash2[slot2];
305 if (hslot->count < hslot2->count)
306 goto begin;
307
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000308 result = udp6_lib_lookup2(net, saddr, sport,
309 &in6addr_any, hnum, dif,
Craig Gallek11341582016-01-05 15:08:07 -0500310 hslot2, slot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000311 }
312 rcu_read_unlock();
313 return result;
314 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700315begin:
316 result = NULL;
317 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800318 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700319 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
320 if (score > badness) {
321 result = sk;
322 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000323 reuseport = sk->sk_reuseport;
324 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200325 hash = udp6_ehashfn(net, daddr, hnum,
326 saddr, sport);
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800327 if (select_ok) {
328 struct sock *sk2;
329
330 sk2 = reuseport_select_sock(sk, hash, skb,
Craig Gallek538950a2016-01-04 17:41:47 -0500331 sizeof(struct udphdr));
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800332 if (sk2) {
333 result = sk2;
334 select_ok = false;
335 goto found;
336 }
Craig Galleke32ea7e2016-01-04 17:41:46 -0500337 }
Tom Herbert72289b92013-01-22 09:50:44 +0000338 matches = 1;
339 }
340 } else if (score == badness && reuseport) {
341 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200342 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000343 result = sk;
344 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 }
346 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800347 /*
348 * if the nulls value we got at the end of this lookup is
349 * not the expected one, we must restart lookup.
350 * We probably met an item that was moved to another chain.
351 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000352 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800353 goto begin;
354
Eric Dumazet271b72c2008-10-29 02:11:14 -0700355 if (result) {
Craig Galleke32ea7e2016-01-04 17:41:46 -0500356found:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000357 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700358 result = NULL;
359 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
360 daddr, dport, dif) < badness)) {
361 sock_put(result);
362 goto begin;
363 }
364 }
365 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 return result;
367}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000368EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700370static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
371 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700372 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700373{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700374 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000375 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700376
Ian Morrise5d08d72014-11-23 21:28:43 +0000377 sk = skb_steal_sock(skb);
378 if (unlikely(sk))
KOVACS Krisztian23542612008-10-07 12:41:01 -0700379 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000380 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
381 &iph->daddr, dport, inet6_iif(skb),
Craig Gallek538950a2016-01-04 17:41:47 -0500382 udptable, skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700383}
384
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200385struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
386 const struct in6_addr *daddr, __be16 dport, int dif)
387{
Craig Gallek538950a2016-01-04 17:41:47 -0500388 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200389}
390EXPORT_SYMBOL_GPL(udp6_lib_lookup);
391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392/*
Ian Morris67ba4152014-08-24 21:53:10 +0100393 * This should be easy, if there is something there we
394 * return it, otherwise we block.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 */
396
Ying Xue1b784142015-03-02 15:37:48 +0800397int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 int noblock, int flags, int *addr_len)
399{
400 struct ipv6_pinfo *np = inet6_sk(sk);
401 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900402 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500403 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000404 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700405 int err;
406 int is_udplite = IS_UDPLITE(sk);
Eric Dumazet197c9492015-12-30 08:51:12 -0500407 bool checksum_valid = false;
Wei Yongjunf26ba172008-11-02 16:11:01 +0000408 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000409 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100412 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Brian Haley4b340ae2010-04-23 11:26:09 +0000414 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100415 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800418 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000419 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 if (!skb)
421 goto out;
422
Herbert Xu759e5d02007-03-25 20:10:56 -0700423 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500424 copied = len;
425 if (copied > ulen)
426 copied = ulen;
427 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900428 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Wei Yongjunf26ba172008-11-02 16:11:01 +0000430 is_udp4 = (skb->protocol == htons(ETH_P_IP));
431
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800432 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700433 * If checksum is needed at all, try to do it while copying the
434 * data. If the data is truncated, or if we only want a partial
435 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800436 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800437
David S. Miller59c2cda2011-12-01 14:12:55 -0500438 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Eric Dumazet197c9492015-12-30 08:51:12 -0500439 checksum_valid = !udp_lib_checksum_complete(skb);
440 if (!checksum_valid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800442 }
443
Eric Dumazet197c9492015-12-30 08:51:12 -0500444 if (checksum_valid || skb_csum_unnecessary(skb))
David S. Miller51f3d022014-11-05 16:46:40 -0500445 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
446 msg, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800447 else {
Al Viro227158d2014-04-06 18:47:38 -0400448 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (err == -EINVAL)
450 goto csum_copy_err;
451 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000452 if (unlikely(err)) {
453 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000454 if (!peeked) {
455 atomic_inc(&sk->sk_drops);
456 if (is_udp4)
457 UDP_INC_STATS_USER(sock_net(sk),
458 UDP_MIB_INERRORS,
459 is_udplite);
460 else
461 UDP6_INC_STATS_USER(sock_net(sk),
462 UDP_MIB_INERRORS,
463 is_udplite);
464 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000466 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000467 if (!peeked) {
468 if (is_udp4)
469 UDP_INC_STATS_USER(sock_net(sk),
470 UDP_MIB_INDATAGRAMS, is_udplite);
471 else
472 UDP6_INC_STATS_USER(sock_net(sk),
473 UDP_MIB_INDATAGRAMS, is_udplite);
474 }
Wang Chencb759942007-12-03 22:33:28 +1100475
Neil Horman3b885782009-10-12 13:26:31 -0700476 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 /* Copy the address. */
479 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100480 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300482 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000485 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700486 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
487 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000488 sin6->sin6_scope_id = 0;
489 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000490 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000491 sin6->sin6_scope_id =
492 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800493 inet6_iif(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100495 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100497
498 if (np->rxopt.all)
499 ip6_datagram_recv_common_ctl(sk, msg, skb);
500
Wei Yongjunf26ba172008-11-02 16:11:01 +0000501 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (inet->cmsg_flags)
503 ip_cmsg_recv(msg, skb);
504 } else {
505 if (np->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100506 ip6_datagram_recv_specific_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
David S. Miller59c2cda2011-12-01 14:12:55 -0500509 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700511 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000514 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515out:
516 return err;
517
518csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000519 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000520 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000521 if (is_udp4) {
522 UDP_INC_STATS_USER(sock_net(sk),
523 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000524 UDP_INC_STATS_USER(sock_net(sk),
525 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000526 } else {
527 UDP6_INC_STATS_USER(sock_net(sk),
528 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000529 UDP6_INC_STATS_USER(sock_net(sk),
530 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000531 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000532 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000533 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Eric Dumazetbeb39db2015-05-30 09:16:53 -0700535 /* starting over for a new packet, but check if we need to yield */
536 cond_resched();
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000537 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 goto try_again;
539}
540
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800541void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700542 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700543 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
545 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000546 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
547 const struct in6_addr *saddr = &hdr->saddr;
548 const struct in6_addr *daddr = &hdr->daddr;
Ian Morris67ba4152014-08-24 21:53:10 +0100549 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 struct sock *sk;
Wei Wange0d8c1b2016-02-17 13:58:22 -0800551 int harderr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 int err;
Duan Jiong7304fe42014-07-31 17:54:32 +0800553 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Craig Galleke32ea7e2016-01-04 17:41:46 -0500555 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
Craig Gallek538950a2016-01-04 17:41:47 -0500556 inet6_iif(skb), udptable, skb);
Ian Morris63159f22015-03-29 14:00:04 +0100557 if (!sk) {
Duan Jiong7304fe42014-07-31 17:54:32 +0800558 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
559 ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return;
Duan Jiong7304fe42014-07-31 17:54:32 +0800561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
Wei Wange0d8c1b2016-02-17 13:58:22 -0800563 harderr = icmpv6_err_convert(type, code, &err);
564 np = inet6_sk(sk);
565
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100566 if (type == ICMPV6_PKT_TOOBIG) {
567 if (!ip6_sk_accept_pmtu(sk))
568 goto out;
David S. Miller81aded22012-06-15 14:54:11 -0700569 ip6_sk_update_pmtu(skb, sk, info);
Wei Wange0d8c1b2016-02-17 13:58:22 -0800570 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
571 harderr = 1;
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100572 }
Duan Jiong1a462d12013-09-20 18:20:28 +0800573 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700574 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800575 goto out;
576 }
David S. Miller81aded22012-06-15 14:54:11 -0700577
Wei Wange0d8c1b2016-02-17 13:58:22 -0800578 if (!np->recverr) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Wei Wange0d8c1b2016-02-17 13:58:22 -0800583 }
Eric Dumazetb1faf562010-05-31 23:44:05 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 sk->sk_err = err;
586 sk->sk_error_report(sk);
587out:
588 sock_put(sk);
589}
590
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000591static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
592{
593 int rc;
594
Eric Dumazetefe42082013-10-03 15:42:29 -0700595 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000596 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500597 sk_mark_napi_id(sk, skb);
Eric Dumazet2c8c56e2014-11-11 05:54:28 -0800598 sk_incoming_cpu_update(sk);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500599 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000600
601 rc = sock_queue_rcv_skb(sk, skb);
602 if (rc < 0) {
603 int is_udplite = IS_UDPLITE(sk);
604
605 /* Note that an ENOMEM error is charged twice */
606 if (rc == -ENOMEM)
607 UDP6_INC_STATS_BH(sock_net(sk),
608 UDP_MIB_RCVBUFERRORS, is_udplite);
609 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
610 kfree_skb(skb);
611 return -1;
612 }
613 return 0;
614}
615
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800616static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700617 struct inet6_skb_parm *opt, u8 type,
Ian Morris67ba4152014-08-24 21:53:10 +0100618 u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
Eric Dumazet645ca702008-10-29 01:41:45 -0700620 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800621}
622
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000623static struct static_key udpv6_encap_needed __read_mostly;
624void udpv6_encap_enable(void)
625{
626 if (!static_key_enabled(&udpv6_encap_needed))
627 static_key_slow_inc(&udpv6_encap_needed);
628}
629EXPORT_SYMBOL(udpv6_encap_enable);
630
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000631int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800632{
633 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700634 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100635 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700636
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800637 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
638 goto drop;
639
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000640 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
641 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
642
643 /*
644 * This is an encapsulation socket so pass the skb to
645 * the socket's udp_encap_rcv() hook. Otherwise, just
646 * fall through and pass this up the UDP socket.
647 * up->encap_rcv() returns the following value:
648 * =0 if skb was successfully passed to the encap
649 * handler or was discarded by it.
650 * >0 if skb should be passed on to UDP.
651 * <0 if skb should be resubmitted as proto -N
652 */
653
654 /* if we're overly short, let UDP handle it */
655 encap_rcv = ACCESS_ONCE(up->encap_rcv);
Ian Morris53b24b82015-03-29 14:00:05 +0100656 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000657 int ret;
658
Tom Herbert0a809662014-05-07 16:52:39 -0700659 /* Verify checksum before giving to encap */
660 if (udp_lib_checksum_complete(skb))
661 goto csum_error;
662
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000663 ret = encap_rcv(sk, skb);
664 if (ret <= 0) {
665 UDP_INC_STATS_BH(sock_net(sk),
666 UDP_MIB_INDATAGRAMS,
667 is_udplite);
668 return -ret;
669 }
670 }
671
672 /* FALLTHROUGH -- it's a UDP Packet */
673 }
674
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800675 /*
676 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
677 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100678 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800679
680 if (up->pcrlen == 0) { /* full coverage was set */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800681 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
682 UDP_SKB_CB(skb)->cscov, skb->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800683 goto drop;
684 }
685 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800686 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
687 UDP_SKB_CB(skb)->cscov, up->pcrlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800688 goto drop;
689 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
691
Eric Dumazet33d480c2011-08-11 19:30:52 +0000692 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800693 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000694 goto csum_error;
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800695 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Sorin Dumitru274f4822014-07-22 21:16:51 +0300697 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
James M Leddy3e215c82014-06-25 17:38:13 -0400698 UDP6_INC_STATS_BH(sock_net(sk),
699 UDP_MIB_RCVBUFERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000700 goto drop;
James M Leddy3e215c82014-06-25 17:38:13 -0400701 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000702
Eric Dumazetd826eb12011-11-09 07:24:35 +0000703 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100704
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000705 bh_lock_sock(sk);
706 rc = 0;
707 if (!sock_owned_by_user(sk))
708 rc = __udpv6_queue_rcv_skb(sk, skb);
709 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
710 bh_unlock_sock(sk);
711 goto drop;
712 }
713 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000714
715 return rc;
James M Leddy3e215c82014-06-25 17:38:13 -0400716
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000717csum_error:
718 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800719drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700720 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000721 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800722 kfree_skb(skb);
723 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724}
725
David Held5cf3d462014-07-15 23:28:31 -0400726static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
727 __be16 loc_port, const struct in6_addr *loc_addr,
728 __be16 rmt_port, const struct in6_addr *rmt_addr,
729 int dif, unsigned short hnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
David Held5cf3d462014-07-15 23:28:31 -0400731 struct inet_sock *inet = inet_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
David Held5cf3d462014-07-15 23:28:31 -0400733 if (!net_eq(sock_net(sk), net))
734 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
David Held5cf3d462014-07-15 23:28:31 -0400736 if (udp_sk(sk)->udp_port_hash != hnum ||
737 sk->sk_family != PF_INET6 ||
738 (inet->inet_dport && inet->inet_dport != rmt_port) ||
739 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
740 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
Henning Rogge33b4b012015-05-18 21:08:49 +0200741 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
742 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
743 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
David Held5cf3d462014-07-15 23:28:31 -0400744 return false;
745 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
746 return false;
747 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000750static void flush_stack(struct sock **stack, unsigned int count,
751 struct sk_buff *skb, unsigned int final)
752{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000753 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000754 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000755 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000756
757 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000758 sk = stack[i];
Ian Morris63159f22015-03-29 14:00:04 +0100759 if (likely(!skb1))
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000760 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
761 if (!skb1) {
762 atomic_inc(&sk->sk_drops);
763 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
764 IS_UDPLITE(sk));
765 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
766 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000767 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000768
769 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
770 skb1 = NULL;
David Held2dc41cf2014-07-15 23:28:32 -0400771 sock_put(sk);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000772 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000773 if (unlikely(skb1))
774 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000775}
Tom Herbert40685792014-05-02 16:29:58 -0700776
777static void udp6_csum_zero_error(struct sk_buff *skb)
778{
779 /* RFC 2460 section 8.1 says that we SHOULD log
780 * this error. Well, it is reasonable.
781 */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800782 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
783 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
784 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
Tom Herbert40685792014-05-02 16:29:58 -0700785}
786
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787/*
788 * Note: called only from the BH handler context,
789 * so we don't need to lock the hashes.
790 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700791static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000792 const struct in6_addr *saddr, const struct in6_addr *daddr,
Rick Jones36cbb242014-11-06 10:37:54 -0800793 struct udp_table *udptable, int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000795 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300796 const struct udphdr *uh = udp_hdr(skb);
David Held5cf3d462014-07-15 23:28:31 -0400797 struct hlist_nulls_node *node;
798 unsigned short hnum = ntohs(uh->dest);
799 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
800 int dif = inet6_iif(skb);
David Held2dc41cf2014-07-15 23:28:32 -0400801 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
802 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
Rick Jones36cbb242014-11-06 10:37:54 -0800803 bool inner_flushed = false;
David Held2dc41cf2014-07-15 23:28:32 -0400804
805 if (use_hash2) {
806 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
807 udp_table.mask;
808 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
809start_lookup:
810 hslot = &udp_table.hash2[hash2];
811 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
812 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Eric Dumazet645ca702008-10-29 01:41:45 -0700814 spin_lock(&hslot->lock);
David Held2dc41cf2014-07-15 23:28:32 -0400815 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
David Held5cf3d462014-07-15 23:28:31 -0400816 if (__udp_v6_is_mcast_sock(net, sk,
817 uh->dest, daddr,
818 uh->source, saddr,
819 dif, hnum) &&
820 /* If zero checksum and no_check is not on for
821 * the socket then skip it.
822 */
823 (uh->check || udp_sk(sk)->no_check6_rx)) {
824 if (unlikely(count == ARRAY_SIZE(stack))) {
825 flush_stack(stack, count, skb, ~0);
Rick Jones36cbb242014-11-06 10:37:54 -0800826 inner_flushed = true;
David Held5cf3d462014-07-15 23:28:31 -0400827 count = 0;
828 }
Tom Herbert40685792014-05-02 16:29:58 -0700829 stack[count++] = sk;
David Held2dc41cf2014-07-15 23:28:32 -0400830 sock_hold(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000833
Eric Dumazet645ca702008-10-29 01:41:45 -0700834 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000835
David Held2dc41cf2014-07-15 23:28:32 -0400836 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
837 if (use_hash2 && hash2 != hash2_any) {
838 hash2 = hash2_any;
839 goto start_lookup;
840 }
841
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000842 if (count) {
843 flush_stack(stack, count, skb, count - 1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000844 } else {
Rick Jones36cbb242014-11-06 10:37:54 -0800845 if (!inner_flushed)
846 UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
847 proto == IPPROTO_UDPLITE);
848 consume_skb(skb);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000849 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800850 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
852
Eric Dumazet645ca702008-10-29 01:41:45 -0700853int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700854 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000856 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900858 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000859 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 u32 ulen = 0;
861
862 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000863 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700865 saddr = &ipv6_hdr(skb)->saddr;
866 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300867 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800870 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 goto short_packet;
872
Herbert Xu759e5d02007-03-25 20:10:56 -0700873 if (proto == IPPROTO_UDP) {
874 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800876 /* Check for jumbo payload */
877 if (ulen == 0)
878 ulen = skb->len;
879
880 if (ulen < sizeof(*uh))
881 goto short_packet;
882
883 if (ulen < skb->len) {
884 if (pskb_trim_rcsum(skb, ulen))
885 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700886 saddr = &ipv6_hdr(skb)->saddr;
887 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300888 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800889 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 }
891
Herbert Xu759e5d02007-03-25 20:10:56 -0700892 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000893 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700894
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900895 /*
896 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800898 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700899 return __udp6_lib_mcast_deliver(net, skb,
Rick Jones36cbb242014-11-06 10:37:54 -0800900 saddr, daddr, udptable, proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 /* Unicast */
903
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900904 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 * check socket cache ... must talk to Alan about his plans
906 * for sock caches... i'll skip this for now.
907 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700908 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Ian Morris53b24b82015-03-29 14:00:05 +0100909 if (sk) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300910 int ret;
911
Tom Herbert1c194482014-05-23 08:47:32 -0700912 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
Tom Herbert79e0f1c2014-05-05 16:43:58 -0700913 sock_put(sk);
Tom Herbert40685792014-05-02 16:29:58 -0700914 udp6_csum_zero_error(skb);
915 goto csum_error;
916 }
917
Tom Herbert224d0192015-01-05 13:56:14 -0800918 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
Tom Herbert2abb7cd2014-08-31 15:12:43 -0700919 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
920 ip6_compute_pseudo);
921
Eliezer Tamira5b50472013-06-10 11:40:00 +0300922 ret = udpv6_queue_rcv_skb(sk, skb);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000923 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000925 /* a return value > 0 means to resubmit the input, but
926 * it wants the return to be -protocol, or 0
927 */
928 if (ret > 0)
929 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800931 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900933
Tom Herbert40685792014-05-02 16:29:58 -0700934 if (!uh->check) {
935 udp6_csum_zero_error(skb);
936 goto csum_error;
937 }
938
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000939 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
940 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900941
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000942 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000943 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000944
945 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
946 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
947
948 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800949 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900951short_packet:
Joe Perchesba7a46f2014-11-11 10:59:17 -0800952 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
953 proto == IPPROTO_UDPLITE ? "-Lite" : "",
954 saddr, ntohs(uh->source),
955 ulen, skb->len,
956 daddr, ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000957 goto discard;
958csum_error:
959 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700961 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800963 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800965
Herbert Xue5bbef22007-10-15 12:50:28 -0700966static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800967{
Eric Dumazet645ca702008-10-29 01:41:45 -0700968 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800969}
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971/*
972 * Throw away all pending data and cancel the corking. Socket is locked.
973 */
974static void udp_v6_flush_pending_frames(struct sock *sk)
975{
976 struct udp_sock *up = udp_sk(sk);
977
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400978 if (up->pending == AF_INET)
979 udp_flush_pending_frames(sk);
980 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 up->len = 0;
982 up->pending = 0;
983 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900984 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985}
986
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000987/**
Ian Morris67ba4152014-08-24 21:53:10 +0100988 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
989 * @sk: socket we are sending on
990 * @skb: sk_buff containing the filled-in UDP header
991 * (checksum field must be zeroed out)
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000992 */
993static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
994 const struct in6_addr *saddr,
995 const struct in6_addr *daddr, int len)
996{
997 unsigned int offset;
998 struct udphdr *uh = udp_hdr(skb);
Vlad Yasevichd39d9382015-01-31 10:40:16 -0500999 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001000 __wsum csum = 0;
1001
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001002 if (!frags) {
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001003 /* Only one fragment on the socket. */
1004 skb->csum_start = skb_transport_header(skb) - skb->head;
1005 skb->csum_offset = offsetof(struct udphdr, check);
1006 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1007 } else {
1008 /*
1009 * HW-checksum won't work as there are two or more
1010 * fragments on the socket so that all csums of sk_buffs
1011 * should be together
1012 */
1013 offset = skb_transport_offset(skb);
1014 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1015
1016 skb->ip_summed = CHECKSUM_NONE;
1017
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001018 do {
1019 csum = csum_add(csum, frags->csum);
1020 } while ((frags = frags->next));
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001021
1022 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1023 csum);
1024 if (uh->check == 0)
1025 uh->check = CSUM_MANGLED_0;
1026 }
1027}
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029/*
1030 * Sending
1031 */
1032
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001033static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034{
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001035 struct sock *sk = skb->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001038 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -08001039 __wsum csum = 0;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001040 int offset = skb_transport_offset(skb);
1041 int len = skb->len - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
1043 /*
1044 * Create a UDP header
1045 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001046 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -05001047 uh->source = fl6->fl6_sport;
1048 uh->dest = fl6->fl6_dport;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001049 uh->len = htons(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 uh->check = 0;
1051
Wang Chenb2bf1e22007-12-03 22:34:16 +11001052 if (is_udplite)
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001053 csum = udplite_csum(skb);
1054 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
Tom Herbert40685792014-05-02 16:29:58 -07001055 skb->ip_summed = CHECKSUM_NONE;
1056 goto send;
1057 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001058 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001059 goto send;
1060 } else
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001061 csum = udp_csum(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001063 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001064 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001065 len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001067 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001069send:
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001070 err = ip6_send_skb(skb);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001071 if (err) {
1072 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1073 UDP6_INC_STATS_USER(sock_net(sk),
1074 UDP_MIB_SNDBUFERRORS, is_udplite);
1075 err = 0;
1076 }
1077 } else
1078 UDP6_INC_STATS_USER(sock_net(sk),
1079 UDP_MIB_OUTDATAGRAMS, is_udplite);
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001080 return err;
1081}
1082
1083static int udp_v6_push_pending_frames(struct sock *sk)
1084{
1085 struct sk_buff *skb;
1086 struct udp_sock *up = udp_sk(sk);
1087 struct flowi6 fl6;
1088 int err = 0;
1089
1090 if (up->pending == AF_INET)
1091 return udp_push_pending_frames(sk);
1092
1093 /* ip6_finish_skb will release the cork, so make a copy of
1094 * fl6 here.
1095 */
1096 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1097
1098 skb = ip6_finish_skb(sk);
1099 if (!skb)
1100 goto out;
1101
1102 err = udp_v6_send_skb(skb, &fl6);
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104out:
1105 up->len = 0;
1106 up->pending = 0;
1107 return err;
1108}
1109
Ying Xue1b784142015-03-02 15:37:48 +08001110int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111{
1112 struct ipv6_txoptions opt_space;
1113 struct udp_sock *up = udp_sk(sk);
1114 struct inet_sock *inet = inet_sk(sk);
1115 struct ipv6_pinfo *np = inet6_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001116 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001117 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 struct ipv6_txoptions *opt = NULL;
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001119 struct ipv6_txoptions *opt_to_free = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001121 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 struct dst_entry *dst;
1123 int addr_len = msg->msg_namelen;
1124 int ulen = len;
1125 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001126 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001127 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1129 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001130 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001131 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001132 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134 /* destination address check */
1135 if (sin6) {
1136 if (addr_len < offsetof(struct sockaddr, sa_data))
1137 return -EINVAL;
1138
1139 switch (sin6->sin6_family) {
1140 case AF_INET6:
1141 if (addr_len < SIN6_LEN_RFC2133)
1142 return -EINVAL;
1143 daddr = &sin6->sin6_addr;
1144 break;
1145 case AF_INET:
1146 goto do_udp_sendmsg;
1147 case AF_UNSPEC:
1148 msg->msg_name = sin6 = NULL;
1149 msg->msg_namelen = addr_len = 0;
1150 daddr = NULL;
1151 break;
1152 default:
1153 return -EINVAL;
1154 }
1155 } else if (!up->pending) {
1156 if (sk->sk_state != TCP_ESTABLISHED)
1157 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001158 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001159 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 daddr = NULL;
1161
1162 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001163 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 struct sockaddr_in sin;
1165 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001166 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1168 msg->msg_name = &sin;
1169 msg->msg_namelen = sizeof(sin);
1170do_udp_sendmsg:
1171 if (__ipv6_only_sock(sk))
1172 return -ENETUNREACH;
Ying Xue1b784142015-03-02 15:37:48 +08001173 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 }
1175 }
1176
1177 if (up->pending == AF_INET)
Ying Xue1b784142015-03-02 15:37:48 +08001178 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
1180 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001181 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 */
1183 if (len > INT_MAX - sizeof(struct udphdr))
1184 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001185
Vlad Yasevich03485f22015-01-31 10:40:17 -05001186 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 if (up->pending) {
1188 /*
1189 * There are pending frames.
1190 * The socket lock must be held while it's corked.
1191 */
1192 lock_sock(sk);
1193 if (likely(up->pending)) {
1194 if (unlikely(up->pending != AF_INET6)) {
1195 release_sock(sk);
1196 return -EAFNOSUPPORT;
1197 }
1198 dst = NULL;
1199 goto do_append_data;
1200 }
1201 release_sock(sk);
1202 }
1203 ulen += sizeof(struct udphdr);
1204
David S. Miller4c9483b2011-03-12 16:22:43 -05001205 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
1207 if (sin6) {
1208 if (sin6->sin6_port == 0)
1209 return -EINVAL;
1210
David S. Miller1958b852011-03-12 16:36:19 -05001211 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 daddr = &sin6->sin6_addr;
1213
1214 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001215 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1216 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1217 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001218 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 }
1221 }
1222
1223 /*
1224 * Otherwise it will be difficult to maintain
1225 * sk->sk_dst_cache.
1226 */
1227 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001228 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1229 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 if (addr_len >= sizeof(struct sockaddr_in6) &&
1232 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001233 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001234 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 } else {
1236 if (sk->sk_state != TCP_ESTABLISHED)
1237 return -EDESTADDRREQ;
1238
David S. Miller1958b852011-03-12 16:36:19 -05001239 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001240 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001241 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001242 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
1244
David S. Miller4c9483b2011-03-12 16:22:43 -05001245 if (!fl6.flowi6_oif)
1246 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
David S. Miller4c9483b2011-03-12 16:22:43 -05001248 if (!fl6.flowi6_oif)
1249 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001250
David S. Miller4c9483b2011-03-12 16:22:43 -05001251 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (msg->msg_controllen) {
1254 opt = &opt_space;
1255 memset(opt, 0, sizeof(struct ipv6_txoptions));
1256 opt->tot_len = sizeof(*opt);
1257
Tom Parkin73df66f2013-01-31 01:02:24 +00001258 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1259 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 if (err < 0) {
1261 fl6_sock_release(flowlabel);
1262 return err;
1263 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001264 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1265 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001266 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 return -EINVAL;
1268 }
1269 if (!(opt->opt_nflen|opt->opt_flen))
1270 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001271 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 }
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001273 if (!opt) {
1274 opt = txopt_get(np);
1275 opt_to_free = opt;
1276 }
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001277 if (flowlabel)
1278 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1279 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
David S. Miller4c9483b2011-03-12 16:22:43 -05001281 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001282 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001283 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001284 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001285 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1286 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001287 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001288 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001289
David S. Miller4c9483b2011-03-12 16:22:43 -05001290 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001291 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001292 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
David S. Miller4c9483b2011-03-12 16:22:43 -05001294 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1295 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001296 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001297 } else if (!fl6.flowi6_oif)
1298 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
David S. Miller4c9483b2011-03-12 16:22:43 -05001300 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001301
Steffen Klassert0e0d44a2013-08-28 08:04:14 +02001302 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001303 if (IS_ERR(dst)) {
1304 err = PTR_ERR(dst);
1305 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
Lorenzo Colitti5c986312014-04-29 11:57:34 +09001309 if (hlimit < 0)
1310 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
Gerrit Renkere651f032009-08-09 08:12:48 +00001312 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001313 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001314
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 if (msg->msg_flags&MSG_CONFIRM)
1316 goto do_confirm;
1317back_from_confirm:
1318
Vlad Yasevich03485f22015-01-31 10:40:17 -05001319 /* Lockless fast path for the non-corking case */
1320 if (!corkreq) {
1321 struct sk_buff *skb;
1322
1323 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1324 sizeof(struct udphdr), hlimit, tclass, opt,
1325 &fl6, (struct rt6_info *)dst,
1326 msg->msg_flags, dontfrag);
1327 err = PTR_ERR(skb);
1328 if (!IS_ERR_OR_NULL(skb))
1329 err = udp_v6_send_skb(skb, &fl6);
1330 goto release_dst;
1331 }
1332
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 lock_sock(sk);
1334 if (unlikely(up->pending)) {
1335 /* The socket is already corked while preparing it. */
1336 /* ... which is an evident application bug. --ANK */
1337 release_sock(sk);
1338
Joe Perchesba7a46f2014-11-11 10:59:17 -08001339 net_dbg_ratelimited("udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 err = -EINVAL;
1341 goto out;
1342 }
1343
1344 up->pending = AF_INET6;
1345
1346do_append_data:
Jiri Pirkoe36d3ff2013-10-19 12:29:15 +02001347 if (dontfrag < 0)
1348 dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 up->len += ulen;
Al Virof69e6d12014-11-24 13:23:40 -05001350 err = ip6_append_data(sk, getfrag, msg, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001351 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
Ian Morris67ba4152014-08-24 21:53:10 +01001352 (struct rt6_info *)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001353 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (err)
1355 udp_v6_flush_pending_frames(sk);
1356 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001357 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001358 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1359 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Vlad Yasevich03485f22015-01-31 10:40:17 -05001361 if (err > 0)
1362 err = np->recverr ? net_xmit_errno(err) : 0;
1363 release_sock(sk);
1364
1365release_dst:
David S. Millera5e7c212005-10-03 14:21:58 -07001366 if (dst) {
1367 if (connected) {
1368 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001369 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1370 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001371#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001372 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001373 &np->saddr :
1374#endif
1375 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001376 } else {
1377 dst_release(dst);
1378 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001379 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001380 }
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001383 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 fl6_sock_release(flowlabel);
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001385 txopt_put(opt_to_free);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001386 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001388 /*
1389 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1390 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1391 * we don't have a good statistic (IpOutDiscards but it can be too many
1392 * things). We could add another new stat but at least for now that
1393 * seems like overkill.
1394 */
1395 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001396 UDP6_INC_STATS_USER(sock_net(sk),
1397 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 return err;
1400
1401do_confirm:
1402 dst_confirm(dst);
1403 if (!(msg->msg_flags&MSG_PROBE) || len)
1404 goto back_from_confirm;
1405 err = 0;
1406 goto out;
1407}
1408
Brian Haley7d06b2e2008-06-14 17:04:49 -07001409void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
Tom Parkin44046a52013-03-19 06:11:12 +00001411 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 lock_sock(sk);
1413 udp_v6_flush_pending_frames(sk);
1414 release_sock(sk);
1415
Tom Parkin44046a52013-03-19 06:11:12 +00001416 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1417 void (*encap_destroy)(struct sock *sk);
1418 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1419 if (encap_destroy)
1420 encap_destroy(sk);
1421 }
1422
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424}
1425
1426/*
1427 * Socket option code for UDP
1428 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001429int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001430 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001431{
David S. Millerdb8dac22008-03-06 16:22:02 -08001432 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001433 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1434 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001435 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001436}
1437
1438#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001439int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001440 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001441{
David S. Millerdb8dac22008-03-06 16:22:02 -08001442 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001443 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1444 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001445 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001446}
1447#endif
1448
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001449int udpv6_getsockopt(struct sock *sk, int level, int optname,
1450 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001451{
David S. Millerdb8dac22008-03-06 16:22:02 -08001452 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001453 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001454 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001455}
1456
1457#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001458int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1459 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001460{
David S. Millerdb8dac22008-03-06 16:22:02 -08001461 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001462 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001463 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001464}
1465#endif
1466
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001467static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 .handler = udpv6_rcv,
1469 .err_handler = udpv6_err,
1470 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1471};
1472
1473/* ------------------------------------------------------------------------ */
1474#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001475int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001477 if (v == SEQ_START_TOKEN) {
1478 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1479 } else {
1480 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1481 struct inet_sock *inet = inet_sk(v);
1482 __u16 srcp = ntohs(inet->inet_sport);
1483 __u16 destp = ntohs(inet->inet_dport);
1484 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1485 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 return 0;
1487}
1488
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001489static const struct file_operations udp6_afinfo_seq_fops = {
1490 .owner = THIS_MODULE,
1491 .open = udp_seq_open,
1492 .read = seq_read,
1493 .llseek = seq_lseek,
1494 .release = seq_release_net
1495};
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 .name = "udp6",
1499 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001500 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001501 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001502 .seq_ops = {
1503 .show = udp6_seq_show,
1504 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505};
1506
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001507int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001509 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510}
1511
Ian Morrisec120da2015-08-14 22:43:38 +01001512void udp6_proc_exit(struct net *net)
1513{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001514 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515}
1516#endif /* CONFIG_PROC_FS */
1517
Eric Dumazetf77d6022013-05-09 10:28:16 +00001518void udp_v6_clear_sk(struct sock *sk, int size)
1519{
1520 struct inet_sock *inet = inet_sk(sk);
1521
1522 /* we do not want to clear pinet6 field, because of RCU lookups */
1523 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1524
1525 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1526 memset(&inet->pinet6 + 1, 0, size);
1527}
1528
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529/* ------------------------------------------------------------------------ */
1530
1531struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001532 .name = "UDPv6",
1533 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001534 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001535 .connect = ip6_datagram_connect,
1536 .disconnect = udp_disconnect,
1537 .ioctl = udp_ioctl,
1538 .destroy = udpv6_destroy_sock,
1539 .setsockopt = udpv6_setsockopt,
1540 .getsockopt = udpv6_getsockopt,
1541 .sendmsg = udpv6_sendmsg,
1542 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001543 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001544 .hash = udp_lib_hash,
1545 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001546 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001547 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001548 .memory_allocated = &udp_memory_allocated,
1549 .sysctl_mem = sysctl_udp_mem,
1550 .sysctl_wmem = &sysctl_udp_wmem_min,
1551 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001552 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001553 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001554 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001555#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001556 .compat_setsockopt = compat_udpv6_setsockopt,
1557 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001558#endif
Eric Dumazetf77d6022013-05-09 10:28:16 +00001559 .clear_sk = udp_v6_clear_sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560};
1561
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562static struct inet_protosw udpv6_protosw = {
1563 .type = SOCK_DGRAM,
1564 .protocol = IPPROTO_UDP,
1565 .prot = &udpv6_prot,
1566 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 .flags = INET_PROTOSW_PERMANENT,
1568};
1569
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001570int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001572 int ret;
1573
Vlad Yasevich33362882012-11-15 08:49:15 +00001574 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1575 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001576 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001577
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001578 ret = inet6_register_protosw(&udpv6_protosw);
1579 if (ret)
1580 goto out_udpv6_protocol;
1581out:
1582 return ret;
1583
1584out_udpv6_protocol:
1585 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1586 goto out;
1587}
1588
Daniel Lezcano09f77092007-12-13 05:34:58 -08001589void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001590{
1591 inet6_unregister_protosw(&udpv6_protosw);
1592 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593}