blob: 089c741a399217b2c7dd90f7783df4aa89eb5424 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * UDP over IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Based on linux/ipv4/udp.c
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/ipv6.h>
33#include <linux/icmpv6.h>
34#include <linux/init.h>
Herbert Xu1781f7f2007-12-11 11:30:32 -080035#include <linux/module.h>
Herbert Xu3305b802005-12-13 23:16:37 -080036#include <linux/skbuff.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/uaccess.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <net/raw.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070045#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <net/ip6_checksum.h>
47#include <net/xfrm.h>
Tom Herbert72289b92013-01-22 09:50:44 +000048#include <net/inet6_hashtables.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +030049#include <net/busy_poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51#include <linux/proc_fs.h>
52#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000053#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080054#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020056static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
61{
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020062 static u32 udp6_ehash_secret __read_mostly;
63 static u32 udp_ipv6_hash_secret __read_mostly;
64
65 u32 lhash, fhash;
66
67 net_get_random_once(&udp6_ehash_secret,
68 sizeof(udp6_ehash_secret));
69 net_get_random_once(&udp_ipv6_hash_secret,
70 sizeof(udp_ipv6_hash_secret));
71
72 lhash = (__force u32)laddr->s6_addr32[3];
73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
74
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020075 return __inet6_ehashfn(lhash, lport, fhash, fport,
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020076 udp_ipv6_hash_secret + net_hash_mix(net));
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020077}
78
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000079int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
80{
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000081 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82 int sk_ipv6only = ipv6_only_sock(sk);
83 int sk2_ipv6only = inet_v6_ipv6only(sk2);
Eric Dumazetefe42082013-10-03 15:42:29 -070084 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000085 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
86
87 /* if both are mapped, treat as IPv4 */
88 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
Vlad Yasevich499923c2009-04-09 17:37:33 +000089 return (!sk2_ipv6only &&
Eric Dumazet50805462013-10-02 04:29:50 -070090 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
91 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000092
93 if (addr_type2 == IPV6_ADDR_ANY &&
94 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
95 return 1;
96
97 if (addr_type == IPV6_ADDR_ANY &&
98 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
99 return 1;
100
101 if (sk2_rcv_saddr6 &&
Eric Dumazetefe42082013-10-03 15:42:29 -0700102 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +0000103 return 1;
104
105 return 0;
106}
107
Eric Dumazetd4cada42009-11-08 10:17:30 +0000108static unsigned int udp6_portaddr_hash(struct net *net,
109 const struct in6_addr *addr6,
110 unsigned int port)
111{
112 unsigned int hash, mix = net_hash_mix(net);
113
114 if (ipv6_addr_any(addr6))
115 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +0000116 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700117 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000118 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -0700119 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +0000120
121 return hash ^ port;
122}
123
124
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700125int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Eric Dumazet30fff922009-11-09 05:26:33 +0000127 unsigned int hash2_nulladdr =
128 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000129 unsigned int hash2_partial =
Eric Dumazetefe42082013-10-03 15:42:29 -0700130 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
Eric Dumazet30fff922009-11-09 05:26:33 +0000131
Eric Dumazetd4cada42009-11-08 10:17:30 +0000132 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000133 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
134 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Eric Dumazet719f8352010-09-08 05:08:44 +0000137static void udp_v6_rehash(struct sock *sk)
138{
139 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
Eric Dumazetefe42082013-10-03 15:42:29 -0700140 &sk->sk_v6_rcv_saddr,
Eric Dumazet719f8352010-09-08 05:08:44 +0000141 inet_sk(sk)->inet_num);
142
143 udp_lib_rehash(sk, new_hash);
144}
145
Eric Dumazet645ca702008-10-29 01:41:45 -0700146static inline int compute_score(struct sock *sk, struct net *net,
147 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200148 const struct in6_addr *saddr, __be16 sport,
149 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700150 int dif)
151{
152 int score = -1;
153
Eric Dumazetd4cada42009-11-08 10:17:30 +0000154 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
Eric Dumazet645ca702008-10-29 01:41:45 -0700155 sk->sk_family == PF_INET6) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700156 struct inet_sock *inet = inet_sk(sk);
157
158 score = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000159 if (inet->inet_dport) {
160 if (inet->inet_dport != sport)
Eric Dumazet645ca702008-10-29 01:41:45 -0700161 return -1;
162 score++;
163 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700164 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
165 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
Eric Dumazet645ca702008-10-29 01:41:45 -0700166 return -1;
167 score++;
168 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700169 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
170 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
Eric Dumazet645ca702008-10-29 01:41:45 -0700171 return -1;
172 score++;
173 }
174 if (sk->sk_bound_dev_if) {
175 if (sk->sk_bound_dev_if != dif)
176 return -1;
177 score++;
178 }
179 }
180 return score;
181}
182
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000183#define SCORE2_MAX (1 + 1 + 1)
184static inline int compute_score2(struct sock *sk, struct net *net,
185 const struct in6_addr *saddr, __be16 sport,
186 const struct in6_addr *daddr, unsigned short hnum,
187 int dif)
188{
189 int score = -1;
190
191 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
192 sk->sk_family == PF_INET6) {
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000193 struct inet_sock *inet = inet_sk(sk);
194
Eric Dumazetefe42082013-10-03 15:42:29 -0700195 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000196 return -1;
197 score = 0;
198 if (inet->inet_dport) {
199 if (inet->inet_dport != sport)
200 return -1;
201 score++;
202 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700203 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
204 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000205 return -1;
206 score++;
207 }
208 if (sk->sk_bound_dev_if) {
209 if (sk->sk_bound_dev_if != dif)
210 return -1;
211 score++;
212 }
213 }
214 return score;
215}
216
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000217
218/* called with read_rcu_lock() */
219static struct sock *udp6_lib_lookup2(struct net *net,
220 const struct in6_addr *saddr, __be16 sport,
221 const struct in6_addr *daddr, unsigned int hnum, int dif,
222 struct udp_hslot *hslot2, unsigned int slot2)
223{
224 struct sock *sk, *result;
225 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000226 int score, badness, matches = 0, reuseport = 0;
227 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000228
229begin:
230 result = NULL;
231 badness = -1;
232 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
233 score = compute_score2(sk, net, saddr, sport,
234 daddr, hnum, dif);
235 if (score > badness) {
236 result = sk;
237 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000238 reuseport = sk->sk_reuseport;
239 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200240 hash = udp6_ehashfn(net, daddr, hnum,
241 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000242 matches = 1;
243 } else if (score == SCORE2_MAX)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000244 goto exact_match;
Tom Herbert72289b92013-01-22 09:50:44 +0000245 } else if (score == badness && reuseport) {
246 matches++;
247 if (((u64)hash * matches) >> 32 == 0)
248 result = sk;
249 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000250 }
251 }
252 /*
253 * if the nulls value we got at the end of this lookup is
254 * not the expected one, we must restart lookup.
255 * We probably met an item that was moved to another chain.
256 */
257 if (get_nulls_value(node) != slot2)
258 goto begin;
259
260 if (result) {
261exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000262 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000263 result = NULL;
264 else if (unlikely(compute_score2(result, net, saddr, sport,
265 daddr, hnum, dif) < badness)) {
266 sock_put(result);
267 goto begin;
268 }
269 }
270 return result;
271}
272
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000273struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200274 const struct in6_addr *saddr, __be16 sport,
275 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700276 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700278 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800279 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000281 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
282 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000283 int score, badness, matches = 0, reuseport = 0;
284 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Eric Dumazet271b72c2008-10-29 02:11:14 -0700286 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000287 if (hslot->count > 10) {
288 hash2 = udp6_portaddr_hash(net, daddr, hnum);
289 slot2 = hash2 & udptable->mask;
290 hslot2 = &udptable->hash2[slot2];
291 if (hslot->count < hslot2->count)
292 goto begin;
293
294 result = udp6_lib_lookup2(net, saddr, sport,
295 daddr, hnum, dif,
296 hslot2, slot2);
297 if (!result) {
298 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
299 slot2 = hash2 & udptable->mask;
300 hslot2 = &udptable->hash2[slot2];
301 if (hslot->count < hslot2->count)
302 goto begin;
303
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000304 result = udp6_lib_lookup2(net, saddr, sport,
305 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000306 hslot2, slot2);
307 }
308 rcu_read_unlock();
309 return result;
310 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700311begin:
312 result = NULL;
313 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800314 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700315 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
316 if (score > badness) {
317 result = sk;
318 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000319 reuseport = sk->sk_reuseport;
320 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200321 hash = udp6_ehashfn(net, daddr, hnum,
322 saddr, sport);
Tom Herbert72289b92013-01-22 09:50:44 +0000323 matches = 1;
324 }
325 } else if (score == badness && reuseport) {
326 matches++;
327 if (((u64)hash * matches) >> 32 == 0)
328 result = sk;
329 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 }
331 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800332 /*
333 * if the nulls value we got at the end of this lookup is
334 * not the expected one, we must restart lookup.
335 * We probably met an item that was moved to another chain.
336 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000337 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800338 goto begin;
339
Eric Dumazet271b72c2008-10-29 02:11:14 -0700340 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000341 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700342 result = NULL;
343 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
344 daddr, dport, dif) < badness)) {
345 sock_put(result);
346 goto begin;
347 }
348 }
349 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return result;
351}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000352EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700354static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
355 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700356 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700357{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700358 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000359 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700360
KOVACS Krisztian23542612008-10-07 12:41:01 -0700361 if (unlikely(sk = skb_steal_sock(skb)))
362 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000363 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
364 &iph->daddr, dport, inet6_iif(skb),
365 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700366}
367
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200368struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
369 const struct in6_addr *daddr, __be16 dport, int dif)
370{
371 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
372}
373EXPORT_SYMBOL_GPL(udp6_lib_lookup);
374
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 * This should be easy, if there is something there we
378 * return it, otherwise we block.
379 */
380
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800381int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 struct msghdr *msg, size_t len,
383 int noblock, int flags, int *addr_len)
384{
385 struct ipv6_pinfo *np = inet6_sk(sk);
386 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900387 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500388 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000389 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700390 int err;
391 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000392 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000393 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100396 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Brian Haley4b340ae2010-04-23 11:26:09 +0000398 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100399 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800402 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000403 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 if (!skb)
405 goto out;
406
Herbert Xu759e5d02007-03-25 20:10:56 -0700407 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500408 copied = len;
409 if (copied > ulen)
410 copied = ulen;
411 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900412 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Wei Yongjunf26ba172008-11-02 16:11:01 +0000414 is_udp4 = (skb->protocol == htons(ETH_P_IP));
415
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800416 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700417 * If checksum is needed at all, try to do it while copying the
418 * data. If the data is truncated, or if we only want a partial
419 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800420 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800421
David S. Miller59c2cda2011-12-01 14:12:55 -0500422 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700423 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800425 }
426
Herbert Xu60476372007-04-09 11:59:39 -0700427 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800428 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
Eric Dumazet22911fc2012-06-27 00:23:44 +0000429 msg->msg_iov, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800430 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
432 if (err == -EINVAL)
433 goto csum_copy_err;
434 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000435 if (unlikely(err)) {
436 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000437 if (!peeked) {
438 atomic_inc(&sk->sk_drops);
439 if (is_udp4)
440 UDP_INC_STATS_USER(sock_net(sk),
441 UDP_MIB_INERRORS,
442 is_udplite);
443 else
444 UDP6_INC_STATS_USER(sock_net(sk),
445 UDP_MIB_INERRORS,
446 is_udplite);
447 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000449 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000450 if (!peeked) {
451 if (is_udp4)
452 UDP_INC_STATS_USER(sock_net(sk),
453 UDP_MIB_INDATAGRAMS, is_udplite);
454 else
455 UDP6_INC_STATS_USER(sock_net(sk),
456 UDP_MIB_INDATAGRAMS, is_udplite);
457 }
Wang Chencb759942007-12-03 22:33:28 +1100458
Neil Horman3b885782009-10-12 13:26:31 -0700459 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 /* Copy the address. */
462 if (msg->msg_name) {
463 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 sin6 = (struct sockaddr_in6 *) msg->msg_name;
466 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300467 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000470 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700471 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
472 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000473 sin6->sin6_scope_id = 0;
474 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000475 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000476 sin6->sin6_scope_id =
477 ipv6_iface_scope_id(&sin6->sin6_addr,
478 IP6CB(skb)->iif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100480 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000482 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (inet->cmsg_flags)
484 ip_cmsg_recv(msg, skb);
485 } else {
486 if (np->rxopt.all)
Tom Parkin73df66f2013-01-31 01:02:24 +0000487 ip6_datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900488 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
David S. Miller59c2cda2011-12-01 14:12:55 -0500490 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700492 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000495 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496out:
497 return err;
498
499csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000500 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000501 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000502 if (is_udp4) {
503 UDP_INC_STATS_USER(sock_net(sk),
504 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000505 UDP_INC_STATS_USER(sock_net(sk),
506 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000507 } else {
508 UDP6_INC_STATS_USER(sock_net(sk),
509 UDP_MIB_CSUMERRORS, is_udplite);
Wei Yongjun0856f932008-11-02 16:14:27 +0000510 UDP6_INC_STATS_USER(sock_net(sk),
511 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000512 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000513 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000514 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
Xufeng Zhang32c90252011-06-21 10:43:39 +0000516 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000518
519 /* starting over for a new packet */
520 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 goto try_again;
522}
523
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800524void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700525 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700526 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527{
528 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000529 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
530 const struct in6_addr *saddr = &hdr->saddr;
531 const struct in6_addr *daddr = &hdr->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
533 struct sock *sk;
534 int err;
535
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900536 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800537 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (sk == NULL)
539 return;
540
David S. Miller81aded22012-06-15 14:54:11 -0700541 if (type == ICMPV6_PKT_TOOBIG)
542 ip6_sk_update_pmtu(skb, sk, info);
Duan Jiong1a462d12013-09-20 18:20:28 +0800543 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700544 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800545 goto out;
546 }
David S. Miller81aded22012-06-15 14:54:11 -0700547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 np = inet6_sk(sk);
549
550 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
551 goto out;
552
553 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
554 goto out;
555
Eric Dumazetb1faf562010-05-31 23:44:05 -0700556 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 sk->sk_err = err;
560 sk->sk_error_report(sk);
561out:
562 sock_put(sk);
563}
564
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000565static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
566{
567 int rc;
568
Eric Dumazetefe42082013-10-03 15:42:29 -0700569 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000570 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500571 sk_mark_napi_id(sk, skb);
572 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000573
574 rc = sock_queue_rcv_skb(sk, skb);
575 if (rc < 0) {
576 int is_udplite = IS_UDPLITE(sk);
577
578 /* Note that an ENOMEM error is charged twice */
579 if (rc == -ENOMEM)
580 UDP6_INC_STATS_BH(sock_net(sk),
581 UDP_MIB_RCVBUFERRORS, is_udplite);
582 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
583 kfree_skb(skb);
584 return -1;
585 }
586 return 0;
587}
588
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800589static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700590 struct inet6_skb_parm *opt, u8 type,
591 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
Eric Dumazet645ca702008-10-29 01:41:45 -0700593 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800594}
595
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000596static struct static_key udpv6_encap_needed __read_mostly;
597void udpv6_encap_enable(void)
598{
599 if (!static_key_enabled(&udpv6_encap_needed))
600 static_key_slow_inc(&udpv6_encap_needed);
601}
602EXPORT_SYMBOL(udpv6_encap_enable);
603
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000604int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800605{
606 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700607 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100608 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700609
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800610 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
611 goto drop;
612
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000613 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
614 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
615
616 /*
617 * This is an encapsulation socket so pass the skb to
618 * the socket's udp_encap_rcv() hook. Otherwise, just
619 * fall through and pass this up the UDP socket.
620 * up->encap_rcv() returns the following value:
621 * =0 if skb was successfully passed to the encap
622 * handler or was discarded by it.
623 * >0 if skb should be passed on to UDP.
624 * <0 if skb should be resubmitted as proto -N
625 */
626
627 /* if we're overly short, let UDP handle it */
628 encap_rcv = ACCESS_ONCE(up->encap_rcv);
629 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
630 int ret;
631
632 ret = encap_rcv(sk, skb);
633 if (ret <= 0) {
634 UDP_INC_STATS_BH(sock_net(sk),
635 UDP_MIB_INDATAGRAMS,
636 is_udplite);
637 return -ret;
638 }
639 }
640
641 /* FALLTHROUGH -- it's a UDP Packet */
642 }
643
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800644 /*
645 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
646 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100647 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800648
649 if (up->pcrlen == 0) { /* full coverage was set */
650 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
651 " %d while full coverage %d requested\n",
652 UDP_SKB_CB(skb)->cscov, skb->len);
653 goto drop;
654 }
655 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
656 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
657 "too small, need min %d\n",
658 UDP_SKB_CB(skb)->cscov, up->pcrlen);
659 goto drop;
660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
662
Eric Dumazet33d480c2011-08-11 19:30:52 +0000663 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800664 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000665 goto csum_error;
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000668 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
669 goto drop;
670
Eric Dumazetd826eb12011-11-09 07:24:35 +0000671 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100672
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000673 bh_lock_sock(sk);
674 rc = 0;
675 if (!sock_owned_by_user(sk))
676 rc = __udpv6_queue_rcv_skb(sk, skb);
677 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
678 bh_unlock_sock(sk);
679 goto drop;
680 }
681 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000682
683 return rc;
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000684csum_error:
685 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800686drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700687 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000688 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800689 kfree_skb(skb);
690 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691}
692
Eric Dumazet920a4612008-11-01 21:22:23 -0700693static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000694 __be16 loc_port, const struct in6_addr *loc_addr,
695 __be16 rmt_port, const struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 int dif)
697{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800698 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 struct sock *s = sk;
700 unsigned short num = ntohs(loc_port);
701
Eric Dumazet88ab1932008-11-16 19:39:21 -0800702 sk_nulls_for_each_from(s, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 struct inet_sock *inet = inet_sk(s);
704
Eric Dumazet920a4612008-11-01 21:22:23 -0700705 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800706 continue;
707
Eric Dumazetd4cada42009-11-08 10:17:30 +0000708 if (udp_sk(s)->udp_port_hash == num &&
709 s->sk_family == PF_INET6) {
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000710 if (inet->inet_dport) {
711 if (inet->inet_dport != rmt_port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 continue;
713 }
Eric Dumazetefe42082013-10-03 15:42:29 -0700714 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
715 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 continue;
717
718 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
719 continue;
720
Eric Dumazetefe42082013-10-03 15:42:29 -0700721 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
722 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
David L Stevens40796c52005-09-14 21:10:20 -0700723 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800725 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 continue;
727 return s;
728 }
729 }
730 return NULL;
731}
732
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000733static void flush_stack(struct sock **stack, unsigned int count,
734 struct sk_buff *skb, unsigned int final)
735{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000736 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000737 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000738 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000739
740 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000741 sk = stack[i];
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000742 if (likely(skb1 == NULL))
743 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
744 if (!skb1) {
745 atomic_inc(&sk->sk_drops);
746 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
747 IS_UDPLITE(sk));
748 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
749 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000750 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000751
752 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
753 skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000754 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000755 if (unlikely(skb1))
756 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000757}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758/*
759 * Note: called only from the BH handler context,
760 * so we don't need to lock the hashes.
761 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700762static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000763 const struct in6_addr *saddr, const struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700764 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000766 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300767 const struct udphdr *uh = udp_hdr(skb);
Eric Dumazetf86dcc52009-10-07 00:37:59 +0000768 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 int dif;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000770 unsigned int i, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Eric Dumazet645ca702008-10-29 01:41:45 -0700772 spin_lock(&hslot->lock);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800773 sk = sk_nulls_head(&hslot->head);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800774 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700775 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000776 while (sk) {
777 stack[count++] = sk;
778 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
779 uh->source, saddr, dif);
780 if (unlikely(count == ARRAY_SIZE(stack))) {
781 if (!sk)
782 break;
783 flush_stack(stack, count, skb, ~0);
784 count = 0;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000787 /*
788 * before releasing the lock, we must take reference on sockets
789 */
790 for (i = 0; i < count; i++)
791 sock_hold(stack[i]);
792
Eric Dumazet645ca702008-10-29 01:41:45 -0700793 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000794
795 if (count) {
796 flush_stack(stack, count, skb, count - 1);
797
798 for (i = 0; i < count; i++)
799 sock_put(stack[i]);
800 } else {
801 kfree_skb(skb);
802 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800803 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804}
805
Eric Dumazet645ca702008-10-29 01:41:45 -0700806int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700807 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000809 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900811 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000812 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 u32 ulen = 0;
814
815 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000816 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700818 saddr = &ipv6_hdr(skb)->saddr;
819 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300820 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800823 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 goto short_packet;
825
Herbert Xu759e5d02007-03-25 20:10:56 -0700826 if (proto == IPPROTO_UDP) {
827 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800829 /* Check for jumbo payload */
830 if (ulen == 0)
831 ulen = skb->len;
832
833 if (ulen < sizeof(*uh))
834 goto short_packet;
835
836 if (ulen < skb->len) {
837 if (pskb_trim_rcsum(skb, ulen))
838 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700839 saddr = &ipv6_hdr(skb)->saddr;
840 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300841 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800842 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 }
844
Herbert Xu759e5d02007-03-25 20:10:56 -0700845 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000846 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700847
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900848 /*
849 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800851 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700852 return __udp6_lib_mcast_deliver(net, skb,
853 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855 /* Unicast */
856
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900857 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 * check socket cache ... must talk to Alan about his plans
859 * for sock caches... i'll skip this for now.
860 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700861 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000862 if (sk != NULL) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300863 int ret;
864
Eliezer Tamira5b50472013-06-10 11:40:00 +0300865 ret = udpv6_queue_rcv_skb(sk, skb);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000866 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000868 /* a return value > 0 means to resubmit the input, but
869 * it wants the return to be -protocol, or 0
870 */
871 if (ret > 0)
872 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800874 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900876
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000877 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
878 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900879
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000880 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000881 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000882
883 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
884 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
885
886 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800887 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900889short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000890 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
David S. Millerdb8dac22008-03-06 16:22:02 -0800891 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000892 saddr,
893 ntohs(uh->source),
894 ulen,
895 skb->len,
896 daddr,
897 ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000898 goto discard;
899csum_error:
900 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700902 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800906
Herbert Xue5bbef22007-10-15 12:50:28 -0700907static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800908{
Eric Dumazet645ca702008-10-29 01:41:45 -0700909 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800910}
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912/*
913 * Throw away all pending data and cancel the corking. Socket is locked.
914 */
915static void udp_v6_flush_pending_frames(struct sock *sk)
916{
917 struct udp_sock *up = udp_sk(sk);
918
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400919 if (up->pending == AF_INET)
920 udp_flush_pending_frames(sk);
921 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 up->len = 0;
923 up->pending = 0;
924 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900925 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926}
927
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000928/**
929 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
930 * @sk: socket we are sending on
931 * @skb: sk_buff containing the filled-in UDP header
932 * (checksum field must be zeroed out)
933 */
934static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
935 const struct in6_addr *saddr,
936 const struct in6_addr *daddr, int len)
937{
938 unsigned int offset;
939 struct udphdr *uh = udp_hdr(skb);
940 __wsum csum = 0;
941
942 if (skb_queue_len(&sk->sk_write_queue) == 1) {
943 /* Only one fragment on the socket. */
944 skb->csum_start = skb_transport_header(skb) - skb->head;
945 skb->csum_offset = offsetof(struct udphdr, check);
946 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
947 } else {
948 /*
949 * HW-checksum won't work as there are two or more
950 * fragments on the socket so that all csums of sk_buffs
951 * should be together
952 */
953 offset = skb_transport_offset(skb);
954 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
955
956 skb->ip_summed = CHECKSUM_NONE;
957
958 skb_queue_walk(&sk->sk_write_queue, skb) {
959 csum = csum_add(csum, skb->csum);
960 }
961
962 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
963 csum);
964 if (uh->check == 0)
965 uh->check = CSUM_MANGLED_0;
966 }
967}
968
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969/*
970 * Sending
971 */
972
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800973static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
975 struct sk_buff *skb;
976 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800977 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 struct inet_sock *inet = inet_sk(sk);
Hannes Frederic Sowa8822b642013-07-01 20:21:30 +0200979 struct flowi6 *fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100981 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800982 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
Hannes Frederic Sowa8822b642013-07-01 20:21:30 +0200984 if (up->pending == AF_INET)
985 return udp_push_pending_frames(sk);
986
987 fl6 = &inet->cork.fl.u.ip6;
988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 /* Grab the skbuff where UDP header space exists. */
990 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
991 goto out;
992
993 /*
994 * Create a UDP header
995 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300996 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -0500997 uh->source = fl6->fl6_sport;
998 uh->dest = fl6->fl6_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 uh->len = htons(up->len);
1000 uh->check = 0;
1001
Wang Chenb2bf1e22007-12-03 22:34:16 +11001002 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001003 csum = udplite_csum_outgoing(sk, skb);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001004 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
David S. Miller4c9483b2011-03-12 16:22:43 -05001005 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001006 up->len);
1007 goto send;
1008 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001009 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001011 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001012 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1013 up->len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001015 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001017send:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001019 if (err) {
1020 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1021 UDP6_INC_STATS_USER(sock_net(sk),
1022 UDP_MIB_SNDBUFERRORS, is_udplite);
1023 err = 0;
1024 }
1025 } else
1026 UDP6_INC_STATS_USER(sock_net(sk),
1027 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028out:
1029 up->len = 0;
1030 up->pending = 0;
1031 return err;
1032}
1033
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001034int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 struct msghdr *msg, size_t len)
1036{
1037 struct ipv6_txoptions opt_space;
1038 struct udp_sock *up = udp_sk(sk);
1039 struct inet_sock *inet = inet_sk(sk);
1040 struct ipv6_pinfo *np = inet6_sk(sk);
1041 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001042 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 struct ipv6_txoptions *opt = NULL;
1044 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001045 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 struct dst_entry *dst;
1047 int addr_len = msg->msg_namelen;
1048 int ulen = len;
1049 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001050 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001051 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1053 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001054 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001055 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001056 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
1058 /* destination address check */
1059 if (sin6) {
1060 if (addr_len < offsetof(struct sockaddr, sa_data))
1061 return -EINVAL;
1062
1063 switch (sin6->sin6_family) {
1064 case AF_INET6:
1065 if (addr_len < SIN6_LEN_RFC2133)
1066 return -EINVAL;
1067 daddr = &sin6->sin6_addr;
1068 break;
1069 case AF_INET:
1070 goto do_udp_sendmsg;
1071 case AF_UNSPEC:
1072 msg->msg_name = sin6 = NULL;
1073 msg->msg_namelen = addr_len = 0;
1074 daddr = NULL;
1075 break;
1076 default:
1077 return -EINVAL;
1078 }
1079 } else if (!up->pending) {
1080 if (sk->sk_state != TCP_ESTABLISHED)
1081 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001082 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001083 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 daddr = NULL;
1085
1086 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001087 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 struct sockaddr_in sin;
1089 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001090 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1092 msg->msg_name = &sin;
1093 msg->msg_namelen = sizeof(sin);
1094do_udp_sendmsg:
1095 if (__ipv6_only_sock(sk))
1096 return -ENETUNREACH;
1097 return udp_sendmsg(iocb, sk, msg, len);
1098 }
1099 }
1100
1101 if (up->pending == AF_INET)
1102 return udp_sendmsg(iocb, sk, msg, len);
1103
1104 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001105 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 */
1107 if (len > INT_MAX - sizeof(struct udphdr))
1108 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if (up->pending) {
1111 /*
1112 * There are pending frames.
1113 * The socket lock must be held while it's corked.
1114 */
1115 lock_sock(sk);
1116 if (likely(up->pending)) {
1117 if (unlikely(up->pending != AF_INET6)) {
1118 release_sock(sk);
1119 return -EAFNOSUPPORT;
1120 }
1121 dst = NULL;
1122 goto do_append_data;
1123 }
1124 release_sock(sk);
1125 }
1126 ulen += sizeof(struct udphdr);
1127
David S. Miller4c9483b2011-03-12 16:22:43 -05001128 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
1130 if (sin6) {
1131 if (sin6->sin6_port == 0)
1132 return -EINVAL;
1133
David S. Miller1958b852011-03-12 16:36:19 -05001134 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 daddr = &sin6->sin6_addr;
1136
1137 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001138 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1139 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1140 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 if (flowlabel == NULL)
1142 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 }
1144 }
1145
1146 /*
1147 * Otherwise it will be difficult to maintain
1148 * sk->sk_dst_cache.
1149 */
1150 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001151 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1152 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154 if (addr_len >= sizeof(struct sockaddr_in6) &&
1155 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001156 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001157 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 } else {
1159 if (sk->sk_state != TCP_ESTABLISHED)
1160 return -EDESTADDRREQ;
1161
David S. Miller1958b852011-03-12 16:36:19 -05001162 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001163 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001164 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001165 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 }
1167
David S. Miller4c9483b2011-03-12 16:22:43 -05001168 if (!fl6.flowi6_oif)
1169 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
David S. Miller4c9483b2011-03-12 16:22:43 -05001171 if (!fl6.flowi6_oif)
1172 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001173
David S. Miller4c9483b2011-03-12 16:22:43 -05001174 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001175
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 if (msg->msg_controllen) {
1177 opt = &opt_space;
1178 memset(opt, 0, sizeof(struct ipv6_txoptions));
1179 opt->tot_len = sizeof(*opt);
1180
Tom Parkin73df66f2013-01-31 01:02:24 +00001181 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1182 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 if (err < 0) {
1184 fl6_sock_release(flowlabel);
1185 return err;
1186 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001187 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1188 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 if (flowlabel == NULL)
1190 return -EINVAL;
1191 }
1192 if (!(opt->opt_nflen|opt->opt_flen))
1193 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001194 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 }
1196 if (opt == NULL)
1197 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001198 if (flowlabel)
1199 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1200 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
David S. Miller4c9483b2011-03-12 16:22:43 -05001202 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001203 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001204 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001205 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001206 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1207 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001208 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001209 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001210
David S. Miller4c9483b2011-03-12 16:22:43 -05001211 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001212 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001213 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
David S. Miller4c9483b2011-03-12 16:22:43 -05001215 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1216 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001217 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001218 } else if (!fl6.flowi6_oif)
1219 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
David S. Miller4c9483b2011-03-12 16:22:43 -05001221 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001222
David S. Miller4c9483b2011-03-12 16:22:43 -05001223 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001224 if (IS_ERR(dst)) {
1225 err = PTR_ERR(dst);
1226 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230 if (hlimit < 0) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001231 if (ipv6_addr_is_multicast(&fl6.daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 hlimit = np->mcast_hops;
1233 else
1234 hlimit = np->hop_limit;
1235 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001236 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 }
1238
Gerrit Renkere651f032009-08-09 08:12:48 +00001239 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001240 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001241
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 if (msg->msg_flags&MSG_CONFIRM)
1243 goto do_confirm;
1244back_from_confirm:
1245
1246 lock_sock(sk);
1247 if (unlikely(up->pending)) {
1248 /* The socket is already corked while preparing it. */
1249 /* ... which is an evident application bug. --ANK */
1250 release_sock(sk);
1251
Patrick McHardy64ce2072005-08-09 20:50:53 -07001252 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 err = -EINVAL;
1254 goto out;
1255 }
1256
1257 up->pending = AF_INET6;
1258
1259do_append_data:
Jiri Pirkoe36d3ff2013-10-19 12:29:15 +02001260 if (dontfrag < 0)
1261 dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001263 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1264 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001265 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001266 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001267 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 if (err)
1269 udp_v6_flush_pending_frames(sk);
1270 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001271 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001272 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1273 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
David S. Millera5e7c212005-10-03 14:21:58 -07001275 if (dst) {
1276 if (connected) {
1277 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001278 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1279 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001280#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001281 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001282 &np->saddr :
1283#endif
1284 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001285 } else {
1286 dst_release(dst);
1287 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001288 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001289 }
1290
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 if (err > 0)
1292 err = np->recverr ? net_xmit_errno(err) : 0;
1293 release_sock(sk);
1294out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001295 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001297 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001299 /*
1300 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1301 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1302 * we don't have a good statistic (IpOutDiscards but it can be too many
1303 * things). We could add another new stat but at least for now that
1304 * seems like overkill.
1305 */
1306 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001307 UDP6_INC_STATS_USER(sock_net(sk),
1308 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001309 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 return err;
1311
1312do_confirm:
1313 dst_confirm(dst);
1314 if (!(msg->msg_flags&MSG_PROBE) || len)
1315 goto back_from_confirm;
1316 err = 0;
1317 goto out;
1318}
1319
Brian Haley7d06b2e2008-06-14 17:04:49 -07001320void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
Tom Parkin44046a52013-03-19 06:11:12 +00001322 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 lock_sock(sk);
1324 udp_v6_flush_pending_frames(sk);
1325 release_sock(sk);
1326
Tom Parkin44046a52013-03-19 06:11:12 +00001327 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1328 void (*encap_destroy)(struct sock *sk);
1329 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1330 if (encap_destroy)
1331 encap_destroy(sk);
1332 }
1333
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335}
1336
1337/*
1338 * Socket option code for UDP
1339 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001340int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001341 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001342{
David S. Millerdb8dac22008-03-06 16:22:02 -08001343 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001344 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1345 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001346 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001347}
1348
1349#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001350int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001351 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001352{
David S. Millerdb8dac22008-03-06 16:22:02 -08001353 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001354 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1355 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001356 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001357}
1358#endif
1359
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001360int udpv6_getsockopt(struct sock *sk, int level, int optname,
1361 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001362{
David S. Millerdb8dac22008-03-06 16:22:02 -08001363 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001364 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001365 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001366}
1367
1368#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001369int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1370 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001371{
David S. Millerdb8dac22008-03-06 16:22:02 -08001372 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001373 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001374 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001375}
1376#endif
1377
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001378static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 .handler = udpv6_rcv,
1380 .err_handler = udpv6_err,
1381 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1382};
1383
1384/* ------------------------------------------------------------------------ */
1385#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001386int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001388 if (v == SEQ_START_TOKEN) {
1389 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1390 } else {
1391 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1392 struct inet_sock *inet = inet_sk(v);
1393 __u16 srcp = ntohs(inet->inet_sport);
1394 __u16 destp = ntohs(inet->inet_dport);
1395 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 return 0;
1398}
1399
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001400static const struct file_operations udp6_afinfo_seq_fops = {
1401 .owner = THIS_MODULE,
1402 .open = udp_seq_open,
1403 .read = seq_read,
1404 .llseek = seq_lseek,
1405 .release = seq_release_net
1406};
1407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 .name = "udp6",
1410 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001411 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001412 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001413 .seq_ops = {
1414 .show = udp6_seq_show,
1415 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416};
1417
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001418int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001420 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421}
1422
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001423void udp6_proc_exit(struct net *net) {
1424 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426#endif /* CONFIG_PROC_FS */
1427
Eric Dumazetf77d6022013-05-09 10:28:16 +00001428void udp_v6_clear_sk(struct sock *sk, int size)
1429{
1430 struct inet_sock *inet = inet_sk(sk);
1431
1432 /* we do not want to clear pinet6 field, because of RCU lookups */
1433 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1434
1435 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1436 memset(&inet->pinet6 + 1, 0, size);
1437}
1438
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439/* ------------------------------------------------------------------------ */
1440
1441struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001442 .name = "UDPv6",
1443 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001444 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001445 .connect = ip6_datagram_connect,
1446 .disconnect = udp_disconnect,
1447 .ioctl = udp_ioctl,
1448 .destroy = udpv6_destroy_sock,
1449 .setsockopt = udpv6_setsockopt,
1450 .getsockopt = udpv6_getsockopt,
1451 .sendmsg = udpv6_sendmsg,
1452 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001453 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001454 .hash = udp_lib_hash,
1455 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001456 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001457 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001458 .memory_allocated = &udp_memory_allocated,
1459 .sysctl_mem = sysctl_udp_mem,
1460 .sysctl_wmem = &sysctl_udp_wmem_min,
1461 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001462 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001463 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001464 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001465#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001466 .compat_setsockopt = compat_udpv6_setsockopt,
1467 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001468#endif
Eric Dumazetf77d6022013-05-09 10:28:16 +00001469 .clear_sk = udp_v6_clear_sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470};
1471
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472static struct inet_protosw udpv6_protosw = {
1473 .type = SOCK_DGRAM,
1474 .protocol = IPPROTO_UDP,
1475 .prot = &udpv6_prot,
1476 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 .no_check = UDP_CSUM_DEFAULT,
1478 .flags = INET_PROTOSW_PERMANENT,
1479};
1480
1481
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001482int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001484 int ret;
1485
Vlad Yasevich33362882012-11-15 08:49:15 +00001486 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1487 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001488 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001489
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001490 ret = inet6_register_protosw(&udpv6_protosw);
1491 if (ret)
1492 goto out_udpv6_protocol;
1493out:
1494 return ret;
1495
1496out_udpv6_protocol:
1497 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1498 goto out;
1499}
1500
Daniel Lezcano09f77092007-12-13 05:34:58 -08001501void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001502{
1503 inet6_unregister_protosw(&udpv6_protosw);
1504 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505}