blob: da6019b63730fcf81f4af2a41bb2b30a8fcde3b1 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50#include <linux/proc_fs.h>
51#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000052#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080053#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000055int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
56{
57 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
58 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
Eric Dumazet68835ab2010-11-30 19:04:07 +000059 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
60 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000061 int sk_ipv6only = ipv6_only_sock(sk);
62 int sk2_ipv6only = inet_v6_ipv6only(sk2);
63 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
64 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
65
66 /* if both are mapped, treat as IPv4 */
67 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
Vlad Yasevich499923c2009-04-09 17:37:33 +000068 return (!sk2_ipv6only &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +000069 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
70 sk1_rcv_saddr == sk2_rcv_saddr));
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000071
72 if (addr_type2 == IPV6_ADDR_ANY &&
73 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
74 return 1;
75
76 if (addr_type == IPV6_ADDR_ANY &&
77 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
78 return 1;
79
80 if (sk2_rcv_saddr6 &&
81 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
82 return 1;
83
84 return 0;
85}
86
Eric Dumazetd4cada42009-11-08 10:17:30 +000087static unsigned int udp6_portaddr_hash(struct net *net,
88 const struct in6_addr *addr6,
89 unsigned int port)
90{
91 unsigned int hash, mix = net_hash_mix(net);
92
93 if (ipv6_addr_any(addr6))
94 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +000095 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -070096 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000097 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -070098 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000099
100 return hash ^ port;
101}
102
103
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700104int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Eric Dumazet30fff922009-11-09 05:26:33 +0000106 unsigned int hash2_nulladdr =
107 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000108 unsigned int hash2_partial =
Eric Dumazet30fff922009-11-09 05:26:33 +0000109 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
110
Eric Dumazetd4cada42009-11-08 10:17:30 +0000111 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000112 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
113 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
Eric Dumazet719f8352010-09-08 05:08:44 +0000116static void udp_v6_rehash(struct sock *sk)
117{
118 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
119 &inet6_sk(sk)->rcv_saddr,
120 inet_sk(sk)->inet_num);
121
122 udp_lib_rehash(sk, new_hash);
123}
124
Eric Dumazet645ca702008-10-29 01:41:45 -0700125static inline int compute_score(struct sock *sk, struct net *net,
126 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200127 const struct in6_addr *saddr, __be16 sport,
128 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700129 int dif)
130{
131 int score = -1;
132
Eric Dumazetd4cada42009-11-08 10:17:30 +0000133 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
Eric Dumazet645ca702008-10-29 01:41:45 -0700134 sk->sk_family == PF_INET6) {
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct inet_sock *inet = inet_sk(sk);
137
138 score = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000139 if (inet->inet_dport) {
140 if (inet->inet_dport != sport)
Eric Dumazet645ca702008-10-29 01:41:45 -0700141 return -1;
142 score++;
143 }
144 if (!ipv6_addr_any(&np->rcv_saddr)) {
145 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
146 return -1;
147 score++;
148 }
149 if (!ipv6_addr_any(&np->daddr)) {
150 if (!ipv6_addr_equal(&np->daddr, saddr))
151 return -1;
152 score++;
153 }
154 if (sk->sk_bound_dev_if) {
155 if (sk->sk_bound_dev_if != dif)
156 return -1;
157 score++;
158 }
159 }
160 return score;
161}
162
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000163#define SCORE2_MAX (1 + 1 + 1)
164static inline int compute_score2(struct sock *sk, struct net *net,
165 const struct in6_addr *saddr, __be16 sport,
166 const struct in6_addr *daddr, unsigned short hnum,
167 int dif)
168{
169 int score = -1;
170
171 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
172 sk->sk_family == PF_INET6) {
173 struct ipv6_pinfo *np = inet6_sk(sk);
174 struct inet_sock *inet = inet_sk(sk);
175
176 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
177 return -1;
178 score = 0;
179 if (inet->inet_dport) {
180 if (inet->inet_dport != sport)
181 return -1;
182 score++;
183 }
184 if (!ipv6_addr_any(&np->daddr)) {
185 if (!ipv6_addr_equal(&np->daddr, saddr))
186 return -1;
187 score++;
188 }
189 if (sk->sk_bound_dev_if) {
190 if (sk->sk_bound_dev_if != dif)
191 return -1;
192 score++;
193 }
194 }
195 return score;
196}
197
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000198
199/* called with read_rcu_lock() */
200static struct sock *udp6_lib_lookup2(struct net *net,
201 const struct in6_addr *saddr, __be16 sport,
202 const struct in6_addr *daddr, unsigned int hnum, int dif,
203 struct udp_hslot *hslot2, unsigned int slot2)
204{
205 struct sock *sk, *result;
206 struct hlist_nulls_node *node;
Tom Herbert72289b92013-01-22 09:50:44 +0000207 int score, badness, matches = 0, reuseport = 0;
208 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000209
210begin:
211 result = NULL;
212 badness = -1;
213 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
214 score = compute_score2(sk, net, saddr, sport,
215 daddr, hnum, dif);
216 if (score > badness) {
217 result = sk;
218 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000219 reuseport = sk->sk_reuseport;
220 if (reuseport) {
221 hash = inet6_ehashfn(net, daddr, hnum,
222 saddr, sport);
223 matches = 1;
224 } else if (score == SCORE2_MAX)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000225 goto exact_match;
Tom Herbert72289b92013-01-22 09:50:44 +0000226 } else if (score == badness && reuseport) {
227 matches++;
228 if (((u64)hash * matches) >> 32 == 0)
229 result = sk;
230 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000231 }
232 }
233 /*
234 * if the nulls value we got at the end of this lookup is
235 * not the expected one, we must restart lookup.
236 * We probably met an item that was moved to another chain.
237 */
238 if (get_nulls_value(node) != slot2)
239 goto begin;
240
241 if (result) {
242exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000243 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000244 result = NULL;
245 else if (unlikely(compute_score2(result, net, saddr, sport,
246 daddr, hnum, dif) < badness)) {
247 sock_put(result);
248 goto begin;
249 }
250 }
251 return result;
252}
253
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000254struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200255 const struct in6_addr *saddr, __be16 sport,
256 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700257 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700259 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800260 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000262 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
263 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000264 int score, badness, matches = 0, reuseport = 0;
265 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Eric Dumazet271b72c2008-10-29 02:11:14 -0700267 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000268 if (hslot->count > 10) {
269 hash2 = udp6_portaddr_hash(net, daddr, hnum);
270 slot2 = hash2 & udptable->mask;
271 hslot2 = &udptable->hash2[slot2];
272 if (hslot->count < hslot2->count)
273 goto begin;
274
275 result = udp6_lib_lookup2(net, saddr, sport,
276 daddr, hnum, dif,
277 hslot2, slot2);
278 if (!result) {
279 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
280 slot2 = hash2 & udptable->mask;
281 hslot2 = &udptable->hash2[slot2];
282 if (hslot->count < hslot2->count)
283 goto begin;
284
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000285 result = udp6_lib_lookup2(net, saddr, sport,
286 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000287 hslot2, slot2);
288 }
289 rcu_read_unlock();
290 return result;
291 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700292begin:
293 result = NULL;
294 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800295 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700296 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
297 if (score > badness) {
298 result = sk;
299 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000300 reuseport = sk->sk_reuseport;
301 if (reuseport) {
302 hash = inet6_ehashfn(net, daddr, hnum,
303 saddr, sport);
304 matches = 1;
305 }
306 } else if (score == badness && reuseport) {
307 matches++;
308 if (((u64)hash * matches) >> 32 == 0)
309 result = sk;
310 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
312 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800313 /*
314 * if the nulls value we got at the end of this lookup is
315 * not the expected one, we must restart lookup.
316 * We probably met an item that was moved to another chain.
317 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000318 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800319 goto begin;
320
Eric Dumazet271b72c2008-10-29 02:11:14 -0700321 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000322 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700323 result = NULL;
324 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
325 daddr, dport, dif) < badness)) {
326 sock_put(result);
327 goto begin;
328 }
329 }
330 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 return result;
332}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000333EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700335static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
336 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700337 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700338{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700339 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000340 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700341
KOVACS Krisztian23542612008-10-07 12:41:01 -0700342 if (unlikely(sk = skb_steal_sock(skb)))
343 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000344 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
345 &iph->daddr, dport, inet6_iif(skb),
346 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700347}
348
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200349struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
350 const struct in6_addr *daddr, __be16 dport, int dif)
351{
352 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
353}
354EXPORT_SYMBOL_GPL(udp6_lib_lookup);
355
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 * This should be easy, if there is something there we
359 * return it, otherwise we block.
360 */
361
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800362int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 struct msghdr *msg, size_t len,
364 int noblock, int flags, int *addr_len)
365{
366 struct ipv6_pinfo *np = inet6_sk(sk);
367 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900368 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500369 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000370 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700371 int err;
372 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000373 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000374 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900376 if (addr_len)
Jeffrin Jose3dde2592012-05-19 01:59:04 +0000377 *addr_len = sizeof(struct sockaddr_in6);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (flags & MSG_ERRQUEUE)
380 return ipv6_recv_error(sk, msg, len);
381
Brian Haley4b340ae2010-04-23 11:26:09 +0000382 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
383 return ipv6_recv_rxpmtu(sk, msg, len);
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800386 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000387 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (!skb)
389 goto out;
390
Herbert Xu759e5d02007-03-25 20:10:56 -0700391 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500392 copied = len;
393 if (copied > ulen)
394 copied = ulen;
395 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900396 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Wei Yongjunf26ba172008-11-02 16:11:01 +0000398 is_udp4 = (skb->protocol == htons(ETH_P_IP));
399
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800400 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700401 * If checksum is needed at all, try to do it while copying the
402 * data. If the data is truncated, or if we only want a partial
403 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800404 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800405
David S. Miller59c2cda2011-12-01 14:12:55 -0500406 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700407 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800409 }
410
Herbert Xu60476372007-04-09 11:59:39 -0700411 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800412 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
Eric Dumazet22911fc2012-06-27 00:23:44 +0000413 msg->msg_iov, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800414 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
416 if (err == -EINVAL)
417 goto csum_copy_err;
418 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000419 if (unlikely(err)) {
420 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000421 if (!peeked) {
422 atomic_inc(&sk->sk_drops);
423 if (is_udp4)
424 UDP_INC_STATS_USER(sock_net(sk),
425 UDP_MIB_INERRORS,
426 is_udplite);
427 else
428 UDP6_INC_STATS_USER(sock_net(sk),
429 UDP_MIB_INERRORS,
430 is_udplite);
431 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 goto out_free;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000433 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000434 if (!peeked) {
435 if (is_udp4)
436 UDP_INC_STATS_USER(sock_net(sk),
437 UDP_MIB_INDATAGRAMS, is_udplite);
438 else
439 UDP6_INC_STATS_USER(sock_net(sk),
440 UDP_MIB_INDATAGRAMS, is_udplite);
441 }
Wang Chencb759942007-12-03 22:33:28 +1100442
Neil Horman3b885782009-10-12 13:26:31 -0700443 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445 /* Copy the address. */
446 if (msg->msg_name) {
447 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 sin6 = (struct sockaddr_in6 *) msg->msg_name;
450 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300451 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000454 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700455 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
456 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000457 sin6->sin6_scope_id = 0;
458 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000459 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000460 sin6->sin6_scope_id =
461 ipv6_iface_scope_id(&sin6->sin6_addr,
462 IP6CB(skb)->iif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464
465 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000466 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 if (inet->cmsg_flags)
468 ip_cmsg_recv(msg, skb);
469 } else {
470 if (np->rxopt.all)
Tom Parkin73df66f2013-01-31 01:02:24 +0000471 ip6_datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900472 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
David S. Miller59c2cda2011-12-01 14:12:55 -0500474 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700476 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000479 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480out:
481 return err;
482
483csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000484 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000485 if (!skb_kill_datagram(sk, skb, flags)) {
486 if (is_udp4)
487 UDP_INC_STATS_USER(sock_net(sk),
488 UDP_MIB_INERRORS, is_udplite);
489 else
490 UDP6_INC_STATS_USER(sock_net(sk),
491 UDP_MIB_INERRORS, is_udplite);
492 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000493 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Xufeng Zhang32c90252011-06-21 10:43:39 +0000495 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000497
498 /* starting over for a new packet */
499 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 goto try_again;
501}
502
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800503void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700504 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700505 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
507 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000508 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
509 const struct in6_addr *saddr = &hdr->saddr;
510 const struct in6_addr *daddr = &hdr->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
512 struct sock *sk;
513 int err;
514
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900515 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800516 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (sk == NULL)
518 return;
519
David S. Miller81aded22012-06-15 14:54:11 -0700520 if (type == ICMPV6_PKT_TOOBIG)
521 ip6_sk_update_pmtu(skb, sk, info);
David S. Millerec18d9a2012-07-12 00:25:15 -0700522 if (type == NDISC_REDIRECT)
523 ip6_sk_redirect(skb, sk);
David S. Miller81aded22012-06-15 14:54:11 -0700524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 np = inet6_sk(sk);
526
527 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
528 goto out;
529
530 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
531 goto out;
532
Eric Dumazetb1faf562010-05-31 23:44:05 -0700533 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 sk->sk_err = err;
537 sk->sk_error_report(sk);
538out:
539 sock_put(sk);
540}
541
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000542static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
543{
544 int rc;
545
546 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
547 sock_rps_save_rxhash(sk, skb);
548
549 rc = sock_queue_rcv_skb(sk, skb);
550 if (rc < 0) {
551 int is_udplite = IS_UDPLITE(sk);
552
553 /* Note that an ENOMEM error is charged twice */
554 if (rc == -ENOMEM)
555 UDP6_INC_STATS_BH(sock_net(sk),
556 UDP_MIB_RCVBUFERRORS, is_udplite);
557 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
558 kfree_skb(skb);
559 return -1;
560 }
561 return 0;
562}
563
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800564static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700565 struct inet6_skb_parm *opt, u8 type,
566 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
Eric Dumazet645ca702008-10-29 01:41:45 -0700568 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800569}
570
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000571static struct static_key udpv6_encap_needed __read_mostly;
572void udpv6_encap_enable(void)
573{
574 if (!static_key_enabled(&udpv6_encap_needed))
575 static_key_slow_inc(&udpv6_encap_needed);
576}
577EXPORT_SYMBOL(udpv6_encap_enable);
578
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000579int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800580{
581 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700582 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100583 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700584
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800585 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
586 goto drop;
587
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000588 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
589 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
590
591 /*
592 * This is an encapsulation socket so pass the skb to
593 * the socket's udp_encap_rcv() hook. Otherwise, just
594 * fall through and pass this up the UDP socket.
595 * up->encap_rcv() returns the following value:
596 * =0 if skb was successfully passed to the encap
597 * handler or was discarded by it.
598 * >0 if skb should be passed on to UDP.
599 * <0 if skb should be resubmitted as proto -N
600 */
601
602 /* if we're overly short, let UDP handle it */
603 encap_rcv = ACCESS_ONCE(up->encap_rcv);
604 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
605 int ret;
606
607 ret = encap_rcv(sk, skb);
608 if (ret <= 0) {
609 UDP_INC_STATS_BH(sock_net(sk),
610 UDP_MIB_INDATAGRAMS,
611 is_udplite);
612 return -ret;
613 }
614 }
615
616 /* FALLTHROUGH -- it's a UDP Packet */
617 }
618
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800619 /*
620 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
621 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100622 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800623
624 if (up->pcrlen == 0) { /* full coverage was set */
625 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
626 " %d while full coverage %d requested\n",
627 UDP_SKB_CB(skb)->cscov, skb->len);
628 goto drop;
629 }
630 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
631 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
632 "too small, need min %d\n",
633 UDP_SKB_CB(skb)->cscov, up->pcrlen);
634 goto drop;
635 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
637
Eric Dumazet33d480c2011-08-11 19:30:52 +0000638 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800639 if (udp_lib_checksum_complete(skb))
640 goto drop;
641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000643 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
644 goto drop;
645
Eric Dumazetd826eb12011-11-09 07:24:35 +0000646 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100647
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000648 bh_lock_sock(sk);
649 rc = 0;
650 if (!sock_owned_by_user(sk))
651 rc = __udpv6_queue_rcv_skb(sk, skb);
652 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
653 bh_unlock_sock(sk);
654 goto drop;
655 }
656 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000657
658 return rc;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800659drop:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700660 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000661 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800662 kfree_skb(skb);
663 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
Eric Dumazet920a4612008-11-01 21:22:23 -0700666static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000667 __be16 loc_port, const struct in6_addr *loc_addr,
668 __be16 rmt_port, const struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 int dif)
670{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800671 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 struct sock *s = sk;
673 unsigned short num = ntohs(loc_port);
674
Eric Dumazet88ab1932008-11-16 19:39:21 -0800675 sk_nulls_for_each_from(s, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 struct inet_sock *inet = inet_sk(s);
677
Eric Dumazet920a4612008-11-01 21:22:23 -0700678 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800679 continue;
680
Eric Dumazetd4cada42009-11-08 10:17:30 +0000681 if (udp_sk(s)->udp_port_hash == num &&
682 s->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 struct ipv6_pinfo *np = inet6_sk(s);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000684 if (inet->inet_dport) {
685 if (inet->inet_dport != rmt_port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 continue;
687 }
688 if (!ipv6_addr_any(&np->daddr) &&
689 !ipv6_addr_equal(&np->daddr, rmt_addr))
690 continue;
691
692 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
693 continue;
694
695 if (!ipv6_addr_any(&np->rcv_saddr)) {
David L Stevens40796c52005-09-14 21:10:20 -0700696 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
697 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800699 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 continue;
701 return s;
702 }
703 }
704 return NULL;
705}
706
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000707static void flush_stack(struct sock **stack, unsigned int count,
708 struct sk_buff *skb, unsigned int final)
709{
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000710 struct sk_buff *skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000711 struct sock *sk;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000712 unsigned int i;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000713
714 for (i = 0; i < count; i++) {
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000715 sk = stack[i];
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000716 if (likely(skb1 == NULL))
717 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
718 if (!skb1) {
719 atomic_inc(&sk->sk_drops);
720 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
721 IS_UDPLITE(sk));
722 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
723 IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000724 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000725
726 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
727 skb1 = NULL;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000728 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000729 if (unlikely(skb1))
730 kfree_skb(skb1);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000731}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732/*
733 * Note: called only from the BH handler context,
734 * so we don't need to lock the hashes.
735 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700736static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000737 const struct in6_addr *saddr, const struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700738 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000740 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300741 const struct udphdr *uh = udp_hdr(skb);
Eric Dumazetf86dcc52009-10-07 00:37:59 +0000742 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 int dif;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000744 unsigned int i, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Eric Dumazet645ca702008-10-29 01:41:45 -0700746 spin_lock(&hslot->lock);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800747 sk = sk_nulls_head(&hslot->head);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800748 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700749 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000750 while (sk) {
751 stack[count++] = sk;
752 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
753 uh->source, saddr, dif);
754 if (unlikely(count == ARRAY_SIZE(stack))) {
755 if (!sk)
756 break;
757 flush_stack(stack, count, skb, ~0);
758 count = 0;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800759 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000761 /*
762 * before releasing the lock, we must take reference on sockets
763 */
764 for (i = 0; i < count; i++)
765 sock_hold(stack[i]);
766
Eric Dumazet645ca702008-10-29 01:41:45 -0700767 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000768
769 if (count) {
770 flush_stack(stack, count, skb, count - 1);
771
772 for (i = 0; i < count; i++)
773 sock_put(stack[i]);
774 } else {
775 kfree_skb(skb);
776 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800777 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779
Eric Dumazet645ca702008-10-29 01:41:45 -0700780int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700781 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000783 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900785 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000786 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 u32 ulen = 0;
788
789 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000790 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700792 saddr = &ipv6_hdr(skb)->saddr;
793 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300794 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800797 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 goto short_packet;
799
Herbert Xu759e5d02007-03-25 20:10:56 -0700800 if (proto == IPPROTO_UDP) {
801 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800803 /* Check for jumbo payload */
804 if (ulen == 0)
805 ulen = skb->len;
806
807 if (ulen < sizeof(*uh))
808 goto short_packet;
809
810 if (ulen < skb->len) {
811 if (pskb_trim_rcsum(skb, ulen))
812 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700813 saddr = &ipv6_hdr(skb)->saddr;
814 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300815 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800816 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 }
818
Herbert Xu759e5d02007-03-25 20:10:56 -0700819 if (udp6_csum_init(skb, uh, proto))
820 goto discard;
821
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900822 /*
823 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800825 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700826 return __udp6_lib_mcast_deliver(net, skb,
827 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
829 /* Unicast */
830
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900831 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 * check socket cache ... must talk to Alan about his plans
833 * for sock caches... i'll skip this for now.
834 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700835 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000836 if (sk != NULL) {
837 int ret = udpv6_queue_rcv_skb(sk, skb);
838 sock_put(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000840 /* a return value > 0 means to resubmit the input, but
841 * it wants the return to be -protocol, or 0
842 */
843 if (ret > 0)
844 return -ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800846 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900848
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000849 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
850 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900851
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000852 if (udp_lib_checksum_complete(skb))
Eric Dumazetc3774112010-04-27 15:13:20 -0700853 goto discard;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000854
855 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
856 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
857
858 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800859 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900861short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000862 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 -0800863 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000864 saddr,
865 ntohs(uh->source),
866 ulen,
867 skb->len,
868 daddr,
869 ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700872 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800874 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800876
Herbert Xue5bbef22007-10-15 12:50:28 -0700877static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800878{
Eric Dumazet645ca702008-10-29 01:41:45 -0700879 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800880}
881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882/*
883 * Throw away all pending data and cancel the corking. Socket is locked.
884 */
885static void udp_v6_flush_pending_frames(struct sock *sk)
886{
887 struct udp_sock *up = udp_sk(sk);
888
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400889 if (up->pending == AF_INET)
890 udp_flush_pending_frames(sk);
891 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 up->len = 0;
893 up->pending = 0;
894 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900895 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896}
897
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000898/**
899 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
900 * @sk: socket we are sending on
901 * @skb: sk_buff containing the filled-in UDP header
902 * (checksum field must be zeroed out)
903 */
904static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
905 const struct in6_addr *saddr,
906 const struct in6_addr *daddr, int len)
907{
908 unsigned int offset;
909 struct udphdr *uh = udp_hdr(skb);
910 __wsum csum = 0;
911
912 if (skb_queue_len(&sk->sk_write_queue) == 1) {
913 /* Only one fragment on the socket. */
914 skb->csum_start = skb_transport_header(skb) - skb->head;
915 skb->csum_offset = offsetof(struct udphdr, check);
916 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
917 } else {
918 /*
919 * HW-checksum won't work as there are two or more
920 * fragments on the socket so that all csums of sk_buffs
921 * should be together
922 */
923 offset = skb_transport_offset(skb);
924 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
925
926 skb->ip_summed = CHECKSUM_NONE;
927
928 skb_queue_walk(&sk->sk_write_queue, skb) {
929 csum = csum_add(csum, skb->csum);
930 }
931
932 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
933 csum);
934 if (uh->check == 0)
935 uh->check = CSUM_MANGLED_0;
936 }
937}
938
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939/*
940 * Sending
941 */
942
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800943static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944{
945 struct sk_buff *skb;
946 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800947 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 struct inet_sock *inet = inet_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500949 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100951 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800952 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954 /* Grab the skbuff where UDP header space exists. */
955 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
956 goto out;
957
958 /*
959 * Create a UDP header
960 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300961 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -0500962 uh->source = fl6->fl6_sport;
963 uh->dest = fl6->fl6_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 uh->len = htons(up->len);
965 uh->check = 0;
966
Wang Chenb2bf1e22007-12-03 22:34:16 +1100967 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800968 csum = udplite_csum_outgoing(sk, skb);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000969 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
David S. Miller4c9483b2011-03-12 16:22:43 -0500970 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000971 up->len);
972 goto send;
973 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800974 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800976 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -0500977 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
978 up->len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800980 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000982send:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -0700984 if (err) {
985 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
986 UDP6_INC_STATS_USER(sock_net(sk),
987 UDP_MIB_SNDBUFERRORS, is_udplite);
988 err = 0;
989 }
990 } else
991 UDP6_INC_STATS_USER(sock_net(sk),
992 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993out:
994 up->len = 0;
995 up->pending = 0;
996 return err;
997}
998
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800999int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 struct msghdr *msg, size_t len)
1001{
1002 struct ipv6_txoptions opt_space;
1003 struct udp_sock *up = udp_sk(sk);
1004 struct inet_sock *inet = inet_sk(sk);
1005 struct ipv6_pinfo *np = inet6_sk(sk);
1006 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001007 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 struct ipv6_txoptions *opt = NULL;
1009 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001010 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 struct dst_entry *dst;
1012 int addr_len = msg->msg_namelen;
1013 int ulen = len;
1014 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001015 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +00001016 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1018 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001019 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001020 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001021 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
1023 /* destination address check */
1024 if (sin6) {
1025 if (addr_len < offsetof(struct sockaddr, sa_data))
1026 return -EINVAL;
1027
1028 switch (sin6->sin6_family) {
1029 case AF_INET6:
1030 if (addr_len < SIN6_LEN_RFC2133)
1031 return -EINVAL;
1032 daddr = &sin6->sin6_addr;
1033 break;
1034 case AF_INET:
1035 goto do_udp_sendmsg;
1036 case AF_UNSPEC:
1037 msg->msg_name = sin6 = NULL;
1038 msg->msg_namelen = addr_len = 0;
1039 daddr = NULL;
1040 break;
1041 default:
1042 return -EINVAL;
1043 }
1044 } else if (!up->pending) {
1045 if (sk->sk_state != TCP_ESTABLISHED)
1046 return -EDESTADDRREQ;
1047 daddr = &np->daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001048 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 daddr = NULL;
1050
1051 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001052 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 struct sockaddr_in sin;
1054 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001055 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1057 msg->msg_name = &sin;
1058 msg->msg_namelen = sizeof(sin);
1059do_udp_sendmsg:
1060 if (__ipv6_only_sock(sk))
1061 return -ENETUNREACH;
1062 return udp_sendmsg(iocb, sk, msg, len);
1063 }
1064 }
1065
1066 if (up->pending == AF_INET)
1067 return udp_sendmsg(iocb, sk, msg, len);
1068
1069 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001070 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 */
1072 if (len > INT_MAX - sizeof(struct udphdr))
1073 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001074
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 if (up->pending) {
1076 /*
1077 * There are pending frames.
1078 * The socket lock must be held while it's corked.
1079 */
1080 lock_sock(sk);
1081 if (likely(up->pending)) {
1082 if (unlikely(up->pending != AF_INET6)) {
1083 release_sock(sk);
1084 return -EAFNOSUPPORT;
1085 }
1086 dst = NULL;
1087 goto do_append_data;
1088 }
1089 release_sock(sk);
1090 }
1091 ulen += sizeof(struct udphdr);
1092
David S. Miller4c9483b2011-03-12 16:22:43 -05001093 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
1095 if (sin6) {
1096 if (sin6->sin6_port == 0)
1097 return -EINVAL;
1098
David S. Miller1958b852011-03-12 16:36:19 -05001099 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 daddr = &sin6->sin6_addr;
1101
1102 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001103 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1104 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1105 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 if (flowlabel == NULL)
1107 return -EINVAL;
1108 daddr = &flowlabel->dst;
1109 }
1110 }
1111
1112 /*
1113 * Otherwise it will be difficult to maintain
1114 * sk->sk_dst_cache.
1115 */
1116 if (sk->sk_state == TCP_ESTABLISHED &&
1117 ipv6_addr_equal(daddr, &np->daddr))
1118 daddr = &np->daddr;
1119
1120 if (addr_len >= sizeof(struct sockaddr_in6) &&
1121 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001122 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001123 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 } else {
1125 if (sk->sk_state != TCP_ESTABLISHED)
1126 return -EDESTADDRREQ;
1127
David S. Miller1958b852011-03-12 16:36:19 -05001128 fl6.fl6_dport = inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 daddr = &np->daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001130 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001131 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 }
1133
David S. Miller4c9483b2011-03-12 16:22:43 -05001134 if (!fl6.flowi6_oif)
1135 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
David S. Miller4c9483b2011-03-12 16:22:43 -05001137 if (!fl6.flowi6_oif)
1138 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001139
David S. Miller4c9483b2011-03-12 16:22:43 -05001140 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 if (msg->msg_controllen) {
1143 opt = &opt_space;
1144 memset(opt, 0, sizeof(struct ipv6_txoptions));
1145 opt->tot_len = sizeof(*opt);
1146
Tom Parkin73df66f2013-01-31 01:02:24 +00001147 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1148 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 if (err < 0) {
1150 fl6_sock_release(flowlabel);
1151 return err;
1152 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001153 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1154 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 if (flowlabel == NULL)
1156 return -EINVAL;
1157 }
1158 if (!(opt->opt_nflen|opt->opt_flen))
1159 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001160 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 }
1162 if (opt == NULL)
1163 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001164 if (flowlabel)
1165 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1166 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
David S. Miller4c9483b2011-03-12 16:22:43 -05001168 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001169 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001170 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001171 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001172 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1173 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001174 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001175 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001176
David S. Miller4c9483b2011-03-12 16:22:43 -05001177 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001178 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001179 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
David S. Miller4c9483b2011-03-12 16:22:43 -05001181 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1182 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001183 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001184 } else if (!fl6.flowi6_oif)
1185 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
David S. Miller4c9483b2011-03-12 16:22:43 -05001187 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001188
David S. Miller4c9483b2011-03-12 16:22:43 -05001189 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001190 if (IS_ERR(dst)) {
1191 err = PTR_ERR(dst);
1192 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 if (hlimit < 0) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001197 if (ipv6_addr_is_multicast(&fl6.daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 hlimit = np->mcast_hops;
1199 else
1200 hlimit = np->hop_limit;
1201 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001202 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 }
1204
Gerrit Renkere651f032009-08-09 08:12:48 +00001205 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001206 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001207
Brian Haley13b52cd2010-04-23 11:26:08 +00001208 if (dontfrag < 0)
1209 dontfrag = np->dontfrag;
1210
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 if (msg->msg_flags&MSG_CONFIRM)
1212 goto do_confirm;
1213back_from_confirm:
1214
1215 lock_sock(sk);
1216 if (unlikely(up->pending)) {
1217 /* The socket is already corked while preparing it. */
1218 /* ... which is an evident application bug. --ANK */
1219 release_sock(sk);
1220
Patrick McHardy64ce2072005-08-09 20:50:53 -07001221 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 err = -EINVAL;
1223 goto out;
1224 }
1225
1226 up->pending = AF_INET6;
1227
1228do_append_data:
1229 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001230 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1231 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001232 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001233 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001234 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 if (err)
1236 udp_v6_flush_pending_frames(sk);
1237 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001238 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001239 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1240 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
David S. Millera5e7c212005-10-03 14:21:58 -07001242 if (dst) {
1243 if (connected) {
1244 ip6_dst_store(sk, dst,
David S. Miller4c9483b2011-03-12 16:22:43 -05001245 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001246 &np->daddr : NULL,
1247#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001248 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001249 &np->saddr :
1250#endif
1251 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001252 } else {
1253 dst_release(dst);
1254 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001255 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001256 }
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 if (err > 0)
1259 err = np->recverr ? net_xmit_errno(err) : 0;
1260 release_sock(sk);
1261out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001262 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001264 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001266 /*
1267 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1268 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1269 * we don't have a good statistic (IpOutDiscards but it can be too many
1270 * things). We could add another new stat but at least for now that
1271 * seems like overkill.
1272 */
1273 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001274 UDP6_INC_STATS_USER(sock_net(sk),
1275 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001276 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 return err;
1278
1279do_confirm:
1280 dst_confirm(dst);
1281 if (!(msg->msg_flags&MSG_PROBE) || len)
1282 goto back_from_confirm;
1283 err = 0;
1284 goto out;
1285}
1286
Brian Haley7d06b2e2008-06-14 17:04:49 -07001287void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288{
Tom Parkin44046a52013-03-19 06:11:12 +00001289 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 lock_sock(sk);
1291 udp_v6_flush_pending_frames(sk);
1292 release_sock(sk);
1293
Tom Parkin44046a52013-03-19 06:11:12 +00001294 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1295 void (*encap_destroy)(struct sock *sk);
1296 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1297 if (encap_destroy)
1298 encap_destroy(sk);
1299 }
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302}
1303
1304/*
1305 * Socket option code for UDP
1306 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001307int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001308 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001309{
David S. Millerdb8dac22008-03-06 16:22:02 -08001310 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001311 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1312 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001313 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001314}
1315
1316#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001317int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001318 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001319{
David S. Millerdb8dac22008-03-06 16:22:02 -08001320 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001321 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1322 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001323 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001324}
1325#endif
1326
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001327int udpv6_getsockopt(struct sock *sk, int level, int optname,
1328 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001329{
David S. Millerdb8dac22008-03-06 16:22:02 -08001330 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001331 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001332 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001333}
1334
1335#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001336int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1337 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001338{
David S. Millerdb8dac22008-03-06 16:22:02 -08001339 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001340 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001341 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001342}
1343#endif
1344
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001345static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 .handler = udpv6_rcv,
1347 .err_handler = udpv6_err,
1348 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1349};
1350
1351/* ------------------------------------------------------------------------ */
1352#ifdef CONFIG_PROC_FS
1353
1354static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1355{
1356 struct inet_sock *inet = inet_sk(sp);
1357 struct ipv6_pinfo *np = inet6_sk(sp);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001358 const struct in6_addr *dest, *src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 __u16 destp, srcp;
1360
1361 dest = &np->daddr;
1362 src = &np->rcv_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001363 destp = ntohs(inet->inet_dport);
1364 srcp = ntohs(inet->inet_sport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 seq_printf(seq,
Eric Dumazetf86dcc52009-10-07 00:37:59 +00001366 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
Dan Rosenberg71338aa2011-05-23 12:17:35 +00001367 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 bucket,
1369 src->s6_addr32[0], src->s6_addr32[1],
1370 src->s6_addr32[2], src->s6_addr32[3], srcp,
1371 dest->s6_addr32[0], dest->s6_addr32[1],
1372 dest->s6_addr32[2], dest->s6_addr32[3], destp,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001373 sp->sk_state,
Eric Dumazet31e6d362009-06-17 19:05:41 -07001374 sk_wmem_alloc_get(sp),
1375 sk_rmem_alloc_get(sp),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 0, 0L, 0,
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001377 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1378 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 sock_i_ino(sp),
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001380 atomic_read(&sp->sk_refcnt), sp,
1381 atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382}
1383
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001384int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
1386 if (v == SEQ_START_TOKEN)
1387 seq_printf(seq,
1388 " sl "
1389 "local_address "
1390 "remote_address "
1391 "st tx_queue rx_queue tr tm->when retrnsmt"
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001392 " uid timeout inode ref pointer drops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 else
1394 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1395 return 0;
1396}
1397
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001398static const struct file_operations udp6_afinfo_seq_fops = {
1399 .owner = THIS_MODULE,
1400 .open = udp_seq_open,
1401 .read = seq_read,
1402 .llseek = seq_lseek,
1403 .release = seq_release_net
1404};
1405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 .name = "udp6",
1408 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001409 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001410 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001411 .seq_ops = {
1412 .show = udp6_seq_show,
1413 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414};
1415
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001416int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001418 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419}
1420
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001421void udp6_proc_exit(struct net *net) {
1422 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423}
1424#endif /* CONFIG_PROC_FS */
1425
1426/* ------------------------------------------------------------------------ */
1427
1428struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001429 .name = "UDPv6",
1430 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001431 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001432 .connect = ip6_datagram_connect,
1433 .disconnect = udp_disconnect,
1434 .ioctl = udp_ioctl,
1435 .destroy = udpv6_destroy_sock,
1436 .setsockopt = udpv6_setsockopt,
1437 .getsockopt = udpv6_getsockopt,
1438 .sendmsg = udpv6_sendmsg,
1439 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001440 .backlog_rcv = __udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001441 .hash = udp_lib_hash,
1442 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001443 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001444 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001445 .memory_allocated = &udp_memory_allocated,
1446 .sysctl_mem = sysctl_udp_mem,
1447 .sysctl_wmem = &sysctl_udp_wmem_min,
1448 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001449 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001450 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001451 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001452#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001453 .compat_setsockopt = compat_udpv6_setsockopt,
1454 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001455#endif
Octavian Purdilafcbdf092010-12-16 14:26:56 -08001456 .clear_sk = sk_prot_clear_portaddr_nulls,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457};
1458
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459static struct inet_protosw udpv6_protosw = {
1460 .type = SOCK_DGRAM,
1461 .protocol = IPPROTO_UDP,
1462 .prot = &udpv6_prot,
1463 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 .no_check = UDP_CSUM_DEFAULT,
1465 .flags = INET_PROTOSW_PERMANENT,
1466};
1467
1468
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001469int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001471 int ret;
1472
Vlad Yasevich33362882012-11-15 08:49:15 +00001473 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1474 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001475 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001476
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001477 ret = inet6_register_protosw(&udpv6_protosw);
1478 if (ret)
1479 goto out_udpv6_protocol;
1480out:
1481 return ret;
1482
1483out_udpv6_protocol:
1484 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1485 goto out;
1486}
1487
Daniel Lezcano09f77092007-12-13 05:34:58 -08001488void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001489{
1490 inet6_unregister_protosw(&udpv6_protosw);
1491 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492}