blob: 2db6808a91e48829779c09c661a4d46e27c2eb42 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * UDP over IPv6
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Based on linux/ipv4/udp.c
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/ipv6.h>
33#include <linux/icmpv6.h>
34#include <linux/init.h>
Herbert Xu1781f7f2007-12-11 11:30:32 -080035#include <linux/module.h>
Herbert Xu3305b802005-12-13 23:16:37 -080036#include <linux/skbuff.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/uaccess.h>
39
Craig Gallek496611d2016-02-10 11:50:36 -050040#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <net/ndisc.h>
42#include <net/protocol.h>
43#include <net/transp_v6.h>
44#include <net/ip6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/raw.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070046#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <net/ip6_checksum.h>
48#include <net/xfrm.h>
subashab@codeaurora.orga4c9e522017-04-18 11:39:41 -060049#include <net/inet_hashtables.h>
Tom Herbert72289b92013-01-22 09:50:44 +000050#include <net/inet6_hashtables.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +030051#include <net/busy_poll.h>
Craig Galleke32ea7e2016-01-04 17:41:46 -050052#include <net/sock_reuseport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54#include <linux/proc_fs.h>
55#include <linux/seq_file.h>
Eric Dumazet22911fc2012-06-27 00:23:44 +000056#include <trace/events/skb.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080057#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Eric Dumazet6eada012015-03-18 14:05:33 -070059static u32 udp6_ehashfn(const struct net *net,
60 const struct in6_addr *laddr,
61 const u16 lport,
62 const struct in6_addr *faddr,
63 const __be16 fport)
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020064{
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020065 static u32 udp6_ehash_secret __read_mostly;
66 static u32 udp_ipv6_hash_secret __read_mostly;
67
68 u32 lhash, fhash;
69
70 net_get_random_once(&udp6_ehash_secret,
71 sizeof(udp6_ehash_secret));
72 net_get_random_once(&udp_ipv6_hash_secret,
73 sizeof(udp_ipv6_hash_secret));
74
75 lhash = (__force u32)laddr->s6_addr32[3];
76 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
77
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020078 return __inet6_ehashfn(lhash, lport, fhash, fport,
Hannes Frederic Sowa1bbdcee2013-10-19 21:48:57 +020079 udp_ipv6_hash_secret + net_hash_mix(net));
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +020080}
81
Eric Dumazet6eada012015-03-18 14:05:33 -070082static u32 udp6_portaddr_hash(const struct net *net,
83 const struct in6_addr *addr6,
84 unsigned int port)
Eric Dumazetd4cada42009-11-08 10:17:30 +000085{
86 unsigned int hash, mix = net_hash_mix(net);
87
88 if (ipv6_addr_any(addr6))
89 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +000090 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -070091 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000092 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -070093 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000094
95 return hash ^ port;
96}
97
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -070098int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
Eric Dumazet30fff922009-11-09 05:26:33 +0000100 unsigned int hash2_nulladdr =
101 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
Jeffrin Jose9a52e972012-05-19 01:45:21 +0000102 unsigned int hash2_partial =
Eric Dumazetefe42082013-10-03 15:42:29 -0700103 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
Eric Dumazet30fff922009-11-09 05:26:33 +0000104
Eric Dumazetd4cada42009-11-08 10:17:30 +0000105 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000106 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
107 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108}
109
Eric Dumazet719f8352010-09-08 05:08:44 +0000110static void udp_v6_rehash(struct sock *sk)
111{
112 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
Eric Dumazetefe42082013-10-03 15:42:29 -0700113 &sk->sk_v6_rcv_saddr,
Eric Dumazet719f8352010-09-08 05:08:44 +0000114 inet_sk(sk)->inet_num);
115
116 udp_lib_rehash(sk, new_hash);
117}
118
Su, Xuemind1e37282016-06-13 11:02:50 +0800119static int compute_score(struct sock *sk, struct net *net,
120 const struct in6_addr *saddr, __be16 sport,
121 const struct in6_addr *daddr, unsigned short hnum,
122 int dif)
Eric Dumazet645ca702008-10-29 01:41:45 -0700123{
Joe Perches60c04ae2014-12-01 20:29:06 -0800124 int score;
125 struct inet_sock *inet;
Eric Dumazet645ca702008-10-29 01:41:45 -0700126
Joe Perches60c04ae2014-12-01 20:29:06 -0800127 if (!net_eq(sock_net(sk), net) ||
128 udp_sk(sk)->udp_port_hash != hnum ||
129 sk->sk_family != PF_INET6)
130 return -1;
Eric Dumazet645ca702008-10-29 01:41:45 -0700131
Joe Perches60c04ae2014-12-01 20:29:06 -0800132 score = 0;
133 inet = inet_sk(sk);
134
135 if (inet->inet_dport) {
136 if (inet->inet_dport != sport)
137 return -1;
138 score++;
Eric Dumazet645ca702008-10-29 01:41:45 -0700139 }
Joe Perches60c04ae2014-12-01 20:29:06 -0800140
141 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
143 return -1;
144 score++;
145 }
146
147 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
148 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
149 return -1;
150 score++;
151 }
152
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158
Eric Dumazet70da2682015-10-08 19:33:21 -0700159 if (sk->sk_incoming_cpu == raw_smp_processor_id())
160 score++;
161
Eric Dumazet645ca702008-10-29 01:41:45 -0700162 return score;
163}
164
Su, Xuemind1e37282016-06-13 11:02:50 +0800165/* called with rcu_read_lock() */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000166static struct sock *udp6_lib_lookup2(struct net *net,
167 const struct in6_addr *saddr, __be16 sport,
168 const struct in6_addr *daddr, unsigned int hnum, int dif,
Su, Xuemind1e37282016-06-13 11:02:50 +0800169 struct udp_hslot *hslot2,
Craig Gallek11341582016-01-05 15:08:07 -0500170 struct sk_buff *skb)
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000171{
172 struct sock *sk, *result;
Tom Herbert72289b92013-01-22 09:50:44 +0000173 int score, badness, matches = 0, reuseport = 0;
174 u32 hash = 0;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000175
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000176 result = NULL;
177 badness = -1;
Eric Dumazetca065d02016-04-01 08:52:13 -0700178 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
Su, Xuemind1e37282016-06-13 11:02:50 +0800179 score = compute_score(sk, net, saddr, sport,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000180 daddr, hnum, dif);
181 if (score > badness) {
Tom Herbert72289b92013-01-22 09:50:44 +0000182 reuseport = sk->sk_reuseport;
183 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200184 hash = udp6_ehashfn(net, daddr, hnum,
185 saddr, sport);
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800186
Eric Dumazetca065d02016-04-01 08:52:13 -0700187 result = reuseport_select_sock(sk, hash, skb,
Eric Dumazeted0dfff2016-01-19 08:36:43 -0800188 sizeof(struct udphdr));
Eric Dumazetca065d02016-04-01 08:52:13 -0700189 if (result)
190 return result;
Tom Herbert72289b92013-01-22 09:50:44 +0000191 matches = 1;
Eric Dumazet70da2682015-10-08 19:33:21 -0700192 }
Eric Dumazetca065d02016-04-01 08:52:13 -0700193 result = sk;
194 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000195 } else if (score == badness && reuseport) {
196 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200197 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000198 result = sk;
199 hash = next_pseudo_random32(hash);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000200 }
201 }
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000202 return result;
203}
204
Eric Dumazetca065d02016-04-01 08:52:13 -0700205/* rcu_read_lock() must be held */
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000206struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200207 const struct in6_addr *saddr, __be16 sport,
208 const struct in6_addr *daddr, __be16 dport,
Craig Gallek538950a2016-01-04 17:41:47 -0500209 int dif, struct udp_table *udptable,
210 struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700212 struct sock *sk, *result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000214 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
215 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Tom Herbert72289b92013-01-22 09:50:44 +0000216 int score, badness, matches = 0, reuseport = 0;
217 u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000219 if (hslot->count > 10) {
220 hash2 = udp6_portaddr_hash(net, daddr, hnum);
221 slot2 = hash2 & udptable->mask;
222 hslot2 = &udptable->hash2[slot2];
223 if (hslot->count < hslot2->count)
224 goto begin;
225
226 result = udp6_lib_lookup2(net, saddr, sport,
227 daddr, hnum, dif,
Su, Xuemind1e37282016-06-13 11:02:50 +0800228 hslot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000229 if (!result) {
Su, Xuemind1e37282016-06-13 11:02:50 +0800230 unsigned int old_slot2 = slot2;
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000231 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
232 slot2 = hash2 & udptable->mask;
Su, Xuemind1e37282016-06-13 11:02:50 +0800233 /* avoid searching the same slot again. */
234 if (unlikely(slot2 == old_slot2))
235 return result;
236
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000237 hslot2 = &udptable->hash2[slot2];
238 if (hslot->count < hslot2->count)
239 goto begin;
240
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000241 result = udp6_lib_lookup2(net, saddr, sport,
Su, Xuemind1e37282016-06-13 11:02:50 +0800242 daddr, hnum, dif,
243 hslot2, skb);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000244 }
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000245 return result;
246 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700247begin:
248 result = NULL;
249 badness = -1;
Eric Dumazetca065d02016-04-01 08:52:13 -0700250 sk_for_each_rcu(sk, &hslot->head) {
Su, Xuemind1e37282016-06-13 11:02:50 +0800251 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif);
Eric Dumazet645ca702008-10-29 01:41:45 -0700252 if (score > badness) {
Tom Herbert72289b92013-01-22 09:50:44 +0000253 reuseport = sk->sk_reuseport;
254 if (reuseport) {
Hannes Frederic Sowab50026b2013-10-19 21:48:52 +0200255 hash = udp6_ehashfn(net, daddr, hnum,
256 saddr, sport);
Eric Dumazetca065d02016-04-01 08:52:13 -0700257 result = reuseport_select_sock(sk, hash, skb,
Craig Gallek538950a2016-01-04 17:41:47 -0500258 sizeof(struct udphdr));
Eric Dumazetca065d02016-04-01 08:52:13 -0700259 if (result)
260 return result;
Tom Herbert72289b92013-01-22 09:50:44 +0000261 matches = 1;
262 }
Eric Dumazetca065d02016-04-01 08:52:13 -0700263 result = sk;
264 badness = score;
Tom Herbert72289b92013-01-22 09:50:44 +0000265 } else if (score == badness && reuseport) {
266 matches++;
Daniel Borkmann8fc54f62014-08-23 20:58:54 +0200267 if (reciprocal_scale(hash, matches) == 0)
Tom Herbert72289b92013-01-22 09:50:44 +0000268 result = sk;
269 hash = next_pseudo_random32(hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return result;
273}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000274EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700276static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
277 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700278 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700279{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000280 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700281
Alexander Duycked7cbbc2016-05-12 16:23:44 -0700282 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
Eric Dumazetadf30902009-06-02 05:19:30 +0000283 &iph->daddr, dport, inet6_iif(skb),
Craig Gallek538950a2016-01-04 17:41:47 -0500284 udptable, skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700285}
286
Tom Herbert63058302016-04-05 08:22:50 -0700287struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
288 __be16 sport, __be16 dport)
289{
290 const struct ipv6hdr *iph = ipv6_hdr(skb);
Tom Herbert63058302016-04-05 08:22:50 -0700291
Alexander Duycked7cbbc2016-05-12 16:23:44 -0700292 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
Tom Herbert63058302016-04-05 08:22:50 -0700293 &iph->daddr, dport, inet6_iif(skb),
294 &udp_table, skb);
295}
296EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
297
Eric Dumazetca065d02016-04-01 08:52:13 -0700298/* Must be called under rcu_read_lock().
299 * Does increment socket refcount.
300 */
301#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
302 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200303struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
304 const struct in6_addr *daddr, __be16 dport, int dif)
305{
Eric Dumazetca065d02016-04-01 08:52:13 -0700306 struct sock *sk;
307
308 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
309 dif, &udp_table, NULL);
310 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
311 sk = NULL;
312 return sk;
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200313}
314EXPORT_SYMBOL_GPL(udp6_lib_lookup);
Eric Dumazetca065d02016-04-01 08:52:13 -0700315#endif
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317/*
Ian Morris67ba4152014-08-24 21:53:10 +0100318 * This should be easy, if there is something there we
319 * return it, otherwise we block.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 */
321
Ying Xue1b784142015-03-02 15:37:48 +0800322int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 int noblock, int flags, int *addr_len)
324{
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900327 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500328 unsigned int ulen, copied;
samanthakumar627d2d62016-04-05 12:41:16 -0400329 int peeked, peeking, off;
Herbert Xu759e5d02007-03-25 20:10:56 -0700330 int err;
331 int is_udplite = IS_UDPLITE(sk);
Eric Dumazet197c9492015-12-30 08:51:12 -0500332 bool checksum_valid = false;
Wei Yongjunf26ba172008-11-02 16:11:01 +0000333 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000334 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (flags & MSG_ERRQUEUE)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100337 return ipv6_recv_error(sk, msg, len, addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Brian Haley4b340ae2010-04-23 11:26:09 +0000339 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100340 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
Brian Haley4b340ae2010-04-23 11:26:09 +0000341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342try_again:
samanthakumar627d2d62016-04-05 12:41:16 -0400343 peeking = off = sk_peek_offset(sk, flags);
Herbert Xua59322b2007-12-05 01:53:40 -0800344 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000345 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (!skb)
samanthakumar627d2d62016-04-05 12:41:16 -0400347 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
samanthakumare6afc8a2016-04-05 12:41:15 -0400349 ulen = skb->len;
David S. Miller59c2cda2011-12-01 14:12:55 -0500350 copied = len;
samanthakumar627d2d62016-04-05 12:41:16 -0400351 if (copied > ulen - off)
352 copied = ulen - off;
David S. Miller59c2cda2011-12-01 14:12:55 -0500353 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900354 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Wei Yongjunf26ba172008-11-02 16:11:01 +0000356 is_udp4 = (skb->protocol == htons(ETH_P_IP));
357
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800358 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700359 * If checksum is needed at all, try to do it while copying the
360 * data. If the data is truncated, or if we only want a partial
361 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800362 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800363
samanthakumar627d2d62016-04-05 12:41:16 -0400364 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
Eric Dumazet197c9492015-12-30 08:51:12 -0500365 checksum_valid = !udp_lib_checksum_complete(skb);
366 if (!checksum_valid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800368 }
369
Eric Dumazet197c9492015-12-30 08:51:12 -0500370 if (checksum_valid || skb_csum_unnecessary(skb))
samanthakumar627d2d62016-04-05 12:41:16 -0400371 err = skb_copy_datagram_msg(skb, off, msg, copied);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800372 else {
samanthakumar627d2d62016-04-05 12:41:16 -0400373 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (err == -EINVAL)
375 goto csum_copy_err;
376 }
Eric Dumazet22911fc2012-06-27 00:23:44 +0000377 if (unlikely(err)) {
378 trace_kfree_skb(skb, udpv6_recvmsg);
Eric Dumazet979402b2012-09-05 23:34:44 +0000379 if (!peeked) {
380 atomic_inc(&sk->sk_drops);
381 if (is_udp4)
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700382 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
383 is_udplite);
Eric Dumazet979402b2012-09-05 23:34:44 +0000384 else
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700385 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
386 is_udplite);
Eric Dumazet979402b2012-09-05 23:34:44 +0000387 }
samanthakumar627d2d62016-04-05 12:41:16 -0400388 skb_free_datagram_locked(sk, skb);
389 return err;
Eric Dumazet22911fc2012-06-27 00:23:44 +0000390 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000391 if (!peeked) {
392 if (is_udp4)
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700393 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
394 is_udplite);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000395 else
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700396 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
397 is_udplite);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000398 }
Wang Chencb759942007-12-03 22:33:28 +1100399
Neil Horman3b885782009-10-12 13:26:31 -0700400 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 /* Copy the address. */
403 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100404 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300406 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 sin6->sin6_flowinfo = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000409 if (is_udp4) {
Brian Haleyb301e822009-10-07 13:58:25 -0700410 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
411 &sin6->sin6_addr);
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000412 sin6->sin6_scope_id = 0;
413 } else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000414 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Hannes Frederic Sowa842df072013-03-08 02:07:19 +0000415 sin6->sin6_scope_id =
416 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800417 inet6_iif(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 }
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100419 *addr_len = sizeof(*sin6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100421
422 if (np->rxopt.all)
423 ip6_datagram_recv_common_ctl(sk, msg, skb);
424
Wei Yongjunf26ba172008-11-02 16:11:01 +0000425 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 if (inet->cmsg_flags)
Eric Dumazet10df8e62016-10-23 18:03:06 -0700427 ip_cmsg_recv_offset(msg, skb,
428 sizeof(struct udphdr), off);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 } else {
430 if (np->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100431 ip6_datagram_recv_specific_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
David S. Miller59c2cda2011-12-01 14:12:55 -0500434 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700436 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
samanthakumar627d2d62016-04-05 12:41:16 -0400438 __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 return err;
440
441csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000442 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000443 if (!skb_kill_datagram(sk, skb, flags)) {
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000444 if (is_udp4) {
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700445 UDP_INC_STATS(sock_net(sk),
446 UDP_MIB_CSUMERRORS, is_udplite);
447 UDP_INC_STATS(sock_net(sk),
448 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000449 } else {
Eric Dumazet6aef70a2016-04-27 16:44:27 -0700450 UDP6_INC_STATS(sock_net(sk),
451 UDP_MIB_CSUMERRORS, is_udplite);
452 UDP6_INC_STATS(sock_net(sk),
453 UDP_MIB_INERRORS, is_udplite);
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000454 }
Wei Yongjun0856f932008-11-02 16:14:27 +0000455 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000456 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Eric Dumazetbeb39db2015-05-30 09:16:53 -0700458 /* starting over for a new packet, but check if we need to yield */
459 cond_resched();
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000460 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 goto try_again;
462}
463
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800464void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700465 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700466 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
468 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000469 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
470 const struct in6_addr *saddr = &hdr->saddr;
471 const struct in6_addr *daddr = &hdr->daddr;
Ian Morris67ba4152014-08-24 21:53:10 +0100472 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct sock *sk;
Wei Wange0d8c1b2016-02-17 13:58:22 -0800474 int harderr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 int err;
Duan Jiong7304fe42014-07-31 17:54:32 +0800476 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Craig Galleke32ea7e2016-01-04 17:41:46 -0500478 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
Craig Gallek538950a2016-01-04 17:41:47 -0500479 inet6_iif(skb), udptable, skb);
Ian Morris63159f22015-03-29 14:00:04 +0100480 if (!sk) {
Eric Dumazeta16292a2016-04-27 16:44:36 -0700481 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
482 ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 return;
Duan Jiong7304fe42014-07-31 17:54:32 +0800484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Wei Wange0d8c1b2016-02-17 13:58:22 -0800486 harderr = icmpv6_err_convert(type, code, &err);
487 np = inet6_sk(sk);
488
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100489 if (type == ICMPV6_PKT_TOOBIG) {
490 if (!ip6_sk_accept_pmtu(sk))
491 goto out;
David S. Miller81aded22012-06-15 14:54:11 -0700492 ip6_sk_update_pmtu(skb, sk, info);
Wei Wange0d8c1b2016-02-17 13:58:22 -0800493 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
494 harderr = 1;
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100495 }
Duan Jiong1a462d12013-09-20 18:20:28 +0800496 if (type == NDISC_REDIRECT) {
David S. Millerec18d9a2012-07-12 00:25:15 -0700497 ip6_sk_redirect(skb, sk);
Duan Jiong1a462d12013-09-20 18:20:28 +0800498 goto out;
499 }
David S. Miller81aded22012-06-15 14:54:11 -0700500
Wei Wange0d8c1b2016-02-17 13:58:22 -0800501 if (!np->recverr) {
502 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
503 goto out;
504 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Wei Wange0d8c1b2016-02-17 13:58:22 -0800506 }
Eric Dumazetb1faf562010-05-31 23:44:05 -0700507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 sk->sk_err = err;
509 sk->sk_error_report(sk);
510out:
Eric Dumazetca065d02016-04-01 08:52:13 -0700511 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512}
513
Eric Dumazet30c7be22016-11-22 09:06:45 -0800514int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000515{
516 int rc;
517
Eric Dumazetefe42082013-10-03 15:42:29 -0700518 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000519 sock_rps_save_rxhash(sk, skb);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500520 sk_mark_napi_id(sk, skb);
Eric Dumazet2c8c56e2014-11-11 05:54:28 -0800521 sk_incoming_cpu_update(sk);
Shawn Bohrer005ec972013-10-07 11:01:38 -0500522 }
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000523
samanthakumare6afc8a2016-04-05 12:41:15 -0400524 rc = __sock_queue_rcv_skb(sk, skb);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000525 if (rc < 0) {
526 int is_udplite = IS_UDPLITE(sk);
527
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
Eric Dumazete61da9e2016-04-29 14:16:50 -0700530 UDP6_INC_STATS(sock_net(sk),
Eric Dumazet02c22342016-04-27 16:44:30 -0700531 UDP_MIB_RCVBUFERRORS, is_udplite);
Eric Dumazete61da9e2016-04-29 14:16:50 -0700532 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000533 kfree_skb(skb);
534 return -1;
535 }
536 return 0;
537}
538
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800539static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700540 struct inet6_skb_parm *opt, u8 type,
Ian Morris67ba4152014-08-24 21:53:10 +0100541 u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
Eric Dumazet645ca702008-10-29 01:41:45 -0700543 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800544}
545
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000546static struct static_key udpv6_encap_needed __read_mostly;
547void udpv6_encap_enable(void)
548{
549 if (!static_key_enabled(&udpv6_encap_needed))
550 static_key_slow_inc(&udpv6_encap_needed);
551}
552EXPORT_SYMBOL(udpv6_encap_enable);
553
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000554int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800555{
556 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700557 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100558 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700559
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
561 goto drop;
562
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
565
566 /*
567 * This is an encapsulation socket so pass the skb to
568 * the socket's udp_encap_rcv() hook. Otherwise, just
569 * fall through and pass this up the UDP socket.
570 * up->encap_rcv() returns the following value:
571 * =0 if skb was successfully passed to the encap
572 * handler or was discarded by it.
573 * >0 if skb should be passed on to UDP.
574 * <0 if skb should be resubmitted as proto -N
575 */
576
577 /* if we're overly short, let UDP handle it */
578 encap_rcv = ACCESS_ONCE(up->encap_rcv);
Hannes Frederic Sowae5aed002016-05-19 15:58:33 +0200579 if (encap_rcv) {
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000580 int ret;
581
Tom Herbert0a809662014-05-07 16:52:39 -0700582 /* Verify checksum before giving to encap */
583 if (udp_lib_checksum_complete(skb))
584 goto csum_error;
585
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000586 ret = encap_rcv(sk, skb);
587 if (ret <= 0) {
Eric Dumazet02c22342016-04-27 16:44:30 -0700588 __UDP_INC_STATS(sock_net(sk),
589 UDP_MIB_INDATAGRAMS,
590 is_udplite);
Benjamin LaHaised7f3f622012-04-27 08:24:08 +0000591 return -ret;
592 }
593 }
594
595 /* FALLTHROUGH -- it's a UDP Packet */
596 }
597
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800598 /*
599 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
600 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100601 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800602
603 if (up->pcrlen == 0) { /* full coverage was set */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800604 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
605 UDP_SKB_CB(skb)->cscov, skb->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800606 goto drop;
607 }
608 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
Joe Perchesba7a46f2014-11-11 10:59:17 -0800609 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
610 UDP_SKB_CB(skb)->cscov, up->pcrlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800611 goto drop;
612 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 }
614
Eric Dumazetce25d662016-06-02 14:52:43 -0700615 if (rcu_access_pointer(sk->sk_filter) &&
616 udp_lib_checksum_complete(skb))
617 goto csum_error;
618
Daniel Borkmannba66bbe2016-07-25 18:06:12 +0200619 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
Michal Kubečeka6127692016-07-08 17:52:33 +0200620 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
samanthakumare6afc8a2016-04-05 12:41:15 -0400622 udp_csum_pull_header(skb);
Sorin Dumitru274f4822014-07-22 21:16:51 +0300623 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
Eric Dumazet02c22342016-04-27 16:44:30 -0700624 __UDP6_INC_STATS(sock_net(sk),
625 UDP_MIB_RCVBUFERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000626 goto drop;
James M Leddy3e215c82014-06-25 17:38:13 -0400627 }
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000628
Eric Dumazetd826eb12011-11-09 07:24:35 +0000629 skb_dst_drop(skb);
Wang Chencb759942007-12-03 22:33:28 +1100630
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000631 bh_lock_sock(sk);
632 rc = 0;
633 if (!sock_owned_by_user(sk))
634 rc = __udpv6_queue_rcv_skb(sk, skb);
635 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
636 bh_unlock_sock(sk);
637 goto drop;
638 }
639 bh_unlock_sock(sk);
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +0000640
641 return rc;
James M Leddy3e215c82014-06-25 17:38:13 -0400642
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000643csum_error:
Eric Dumazet02c22342016-04-27 16:44:30 -0700644 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800645drop:
Eric Dumazet02c22342016-04-27 16:44:30 -0700646 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000647 atomic_inc(&sk->sk_drops);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800648 kfree_skb(skb);
649 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
David Held5cf3d462014-07-15 23:28:31 -0400652static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
653 __be16 loc_port, const struct in6_addr *loc_addr,
654 __be16 rmt_port, const struct in6_addr *rmt_addr,
655 int dif, unsigned short hnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
David Held5cf3d462014-07-15 23:28:31 -0400657 struct inet_sock *inet = inet_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
David Held5cf3d462014-07-15 23:28:31 -0400659 if (!net_eq(sock_net(sk), net))
660 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
David Held5cf3d462014-07-15 23:28:31 -0400662 if (udp_sk(sk)->udp_port_hash != hnum ||
663 sk->sk_family != PF_INET6 ||
664 (inet->inet_dport && inet->inet_dport != rmt_port) ||
665 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
666 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
Henning Rogge33b4b012015-05-18 21:08:49 +0200667 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
668 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
669 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
David Held5cf3d462014-07-15 23:28:31 -0400670 return false;
671 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
672 return false;
673 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
Tom Herbert40685792014-05-02 16:29:58 -0700676static void udp6_csum_zero_error(struct sk_buff *skb)
677{
678 /* RFC 2460 section 8.1 says that we SHOULD log
679 * this error. Well, it is reasonable.
680 */
Joe Perchesba7a46f2014-11-11 10:59:17 -0800681 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
682 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
683 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
Tom Herbert40685792014-05-02 16:29:58 -0700684}
685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686/*
687 * Note: called only from the BH handler context,
688 * so we don't need to lock the hashes.
689 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700690static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000691 const struct in6_addr *saddr, const struct in6_addr *daddr,
Rick Jones36cbb242014-11-06 10:37:54 -0800692 struct udp_table *udptable, int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Eric Dumazetca065d02016-04-01 08:52:13 -0700694 struct sock *sk, *first = NULL;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300695 const struct udphdr *uh = udp_hdr(skb);
David Held5cf3d462014-07-15 23:28:31 -0400696 unsigned short hnum = ntohs(uh->dest);
697 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
Eric Dumazetca065d02016-04-01 08:52:13 -0700698 unsigned int offset = offsetof(typeof(*sk), sk_node);
David Held2dc41cf2014-07-15 23:28:32 -0400699 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
Eric Dumazetca065d02016-04-01 08:52:13 -0700700 int dif = inet6_iif(skb);
701 struct hlist_node *node;
702 struct sk_buff *nskb;
David Held2dc41cf2014-07-15 23:28:32 -0400703
704 if (use_hash2) {
705 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
Pablo Neira73e2d5e2016-11-14 23:40:30 +0100706 udptable->mask;
707 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
David Held2dc41cf2014-07-15 23:28:32 -0400708start_lookup:
Pablo Neira73e2d5e2016-11-14 23:40:30 +0100709 hslot = &udptable->hash2[hash2];
David Held2dc41cf2014-07-15 23:28:32 -0400710 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
Eric Dumazetca065d02016-04-01 08:52:13 -0700713 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
714 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
715 uh->source, saddr, dif, hnum))
716 continue;
717 /* If zero checksum and no_check is not on for
718 * the socket then skip it.
719 */
720 if (!uh->check && !udp_sk(sk)->no_check6_rx)
721 continue;
722 if (!first) {
723 first = sk;
724 continue;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800725 }
Eric Dumazetca065d02016-04-01 08:52:13 -0700726 nskb = skb_clone(skb, GFP_ATOMIC);
727 if (unlikely(!nskb)) {
728 atomic_inc(&sk->sk_drops);
Eric Dumazet02c22342016-04-27 16:44:30 -0700729 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
730 IS_UDPLITE(sk));
731 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
732 IS_UDPLITE(sk));
Eric Dumazetca065d02016-04-01 08:52:13 -0700733 continue;
734 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000735
Eric Dumazetca065d02016-04-01 08:52:13 -0700736 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
737 consume_skb(nskb);
738 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000739
David Held2dc41cf2014-07-15 23:28:32 -0400740 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
741 if (use_hash2 && hash2 != hash2_any) {
742 hash2 = hash2_any;
743 goto start_lookup;
744 }
745
Eric Dumazetca065d02016-04-01 08:52:13 -0700746 if (first) {
747 if (udpv6_queue_rcv_skb(first, skb) > 0)
748 consume_skb(skb);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000749 } else {
Eric Dumazetca065d02016-04-01 08:52:13 -0700750 kfree_skb(skb);
Eric Dumazet02c22342016-04-27 16:44:30 -0700751 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
752 proto == IPPROTO_UDPLITE);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000753 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800754 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
756
Paolo Abeni6767cbd2017-08-25 14:31:01 +0200757static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
758{
759 if (udp_sk_rx_dst_set(sk, dst)) {
760 const struct rt6_info *rt = (const struct rt6_info *)dst;
761
762 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
763 }
764}
765
Eric Dumazet645ca702008-10-29 01:41:45 -0700766int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700767 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000769 const struct in6_addr *saddr, *daddr;
Eric Dumazetca065d02016-04-01 08:52:13 -0700770 struct net *net = dev_net(skb->dev);
771 struct udphdr *uh;
772 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 u32 ulen = 0;
774
775 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000776 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700778 saddr = &ipv6_hdr(skb)->saddr;
779 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300780 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800783 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 goto short_packet;
785
Herbert Xu759e5d02007-03-25 20:10:56 -0700786 if (proto == IPPROTO_UDP) {
787 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800789 /* Check for jumbo payload */
790 if (ulen == 0)
791 ulen = skb->len;
792
793 if (ulen < sizeof(*uh))
794 goto short_packet;
795
796 if (ulen < skb->len) {
797 if (pskb_trim_rcsum(skb, ulen))
798 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700799 saddr = &ipv6_hdr(skb)->saddr;
800 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300801 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800802 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 }
804
Herbert Xu759e5d02007-03-25 20:10:56 -0700805 if (udp6_csum_init(skb, uh, proto))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000806 goto csum_error;
Herbert Xu759e5d02007-03-25 20:10:56 -0700807
Paolo Abeni04cb69d2017-07-27 14:45:09 +0200808 /* Check if the socket is already available, e.g. due to early demux */
809 sk = skb_steal_sock(skb);
810 if (sk) {
811 struct dst_entry *dst = skb_dst(skb);
812 int ret;
813
814 if (unlikely(sk->sk_rx_dst != dst))
Paolo Abeni6767cbd2017-08-25 14:31:01 +0200815 udp6_sk_rx_dst_set(sk, dst);
Paolo Abeni04cb69d2017-07-27 14:45:09 +0200816
817 ret = udpv6_queue_rcv_skb(sk, skb);
818 sock_put(sk);
819
820 /* a return value > 0 means to resubmit the input */
821 if (ret > 0)
822 return ret;
823 return 0;
824 }
825
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900826 /*
827 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800829 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700830 return __udp6_lib_mcast_deliver(net, skb,
Rick Jones36cbb242014-11-06 10:37:54 -0800831 saddr, daddr, udptable, proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 /* Unicast */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700834 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Ian Morris53b24b82015-03-29 14:00:05 +0100835 if (sk) {
Eliezer Tamira5b50472013-06-10 11:40:00 +0300836 int ret;
837
Tom Herbert1c194482014-05-23 08:47:32 -0700838 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
Tom Herbert40685792014-05-02 16:29:58 -0700839 udp6_csum_zero_error(skb);
840 goto csum_error;
841 }
842
Tom Herbert224d0192015-01-05 13:56:14 -0800843 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
Tom Herbert2abb7cd2014-08-31 15:12:43 -0700844 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
845 ip6_compute_pseudo);
846
Eliezer Tamira5b50472013-06-10 11:40:00 +0300847 ret = udpv6_queue_rcv_skb(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
Bill Sommerfeld59dca1d2016-03-04 14:47:21 -0800849 /* a return value > 0 means to resubmit the input */
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000850 if (ret > 0)
Bill Sommerfeld59dca1d2016-03-04 14:47:21 -0800851 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800853 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900855
Tom Herbert40685792014-05-02 16:29:58 -0700856 if (!uh->check) {
857 udp6_csum_zero_error(skb);
858 goto csum_error;
859 }
860
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000861 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
862 goto discard;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900863
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000864 if (udp_lib_checksum_complete(skb))
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000865 goto csum_error;
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000866
Eric Dumazet02c22342016-04-27 16:44:30 -0700867 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
Benjamin LaHaisecb80ef42012-04-27 08:23:59 +0000868 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
869
870 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800871 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900873short_packet:
Joe Perchesba7a46f2014-11-11 10:59:17 -0800874 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
875 proto == IPPROTO_UDPLITE ? "-Lite" : "",
876 saddr, ntohs(uh->source),
877 ulen, skb->len,
878 daddr, ntohs(uh->dest));
Eric Dumazet6a5dc9e2013-04-29 08:39:56 +0000879 goto discard;
880csum_error:
Eric Dumazet02c22342016-04-27 16:44:30 -0700881 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882discard:
Eric Dumazet02c22342016-04-27 16:44:30 -0700883 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800885 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800887
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -0700888static struct sock *__udp6_lib_demux_lookup(struct net *net,
889 __be16 loc_port,
890 const struct in6_addr *loc_addr,
891 __be16 rmt_port,
892 const struct in6_addr *rmt_addr,
893 int dif)
894{
subashab@codeaurora.orga4c9e522017-04-18 11:39:41 -0600895 unsigned short hnum = ntohs(loc_port);
896 unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);
897 unsigned int slot2 = hash2 & udp_table.mask;
898 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
899
900 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -0700901 struct sock *sk;
902
subashab@codeaurora.orga4c9e522017-04-18 11:39:41 -0600903 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
Wei Wangd61f7af2017-06-23 15:25:37 -0700904 if (sk->sk_state == TCP_ESTABLISHED &&
905 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif))
subashab@codeaurora.orga4c9e522017-04-18 11:39:41 -0600906 return sk;
907 /* Only check first socket in chain */
908 break;
909 }
910 return NULL;
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -0700911}
912
913static void udp_v6_early_demux(struct sk_buff *skb)
914{
915 struct net *net = dev_net(skb->dev);
916 const struct udphdr *uh;
917 struct sock *sk;
918 struct dst_entry *dst;
919 int dif = skb->dev->ifindex;
920
921 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
922 sizeof(struct udphdr)))
923 return;
924
925 uh = udp_hdr(skb);
926
927 if (skb->pkt_type == PACKET_HOST)
928 sk = __udp6_lib_demux_lookup(net, uh->dest,
929 &ipv6_hdr(skb)->daddr,
930 uh->source, &ipv6_hdr(skb)->saddr,
931 dif);
932 else
933 return;
934
subashab@codeaurora.orga4c9e522017-04-18 11:39:41 -0600935 if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2))
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -0700936 return;
937
938 skb->sk = sk;
939 skb->destructor = sock_efree;
940 dst = READ_ONCE(sk->sk_rx_dst);
941
942 if (dst)
943 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
944 if (dst) {
Wei Wang18fb43b2017-06-17 10:42:25 -0700945 /* set noref for now.
946 * any place which wants to hold dst has to call
947 * dst_hold_safe()
948 */
949 skb_dst_set_noref(skb, dst);
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -0700950 }
951}
952
Herbert Xue5bbef22007-10-15 12:50:28 -0700953static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800954{
Eric Dumazet645ca702008-10-29 01:41:45 -0700955 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800956}
957
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958/*
959 * Throw away all pending data and cancel the corking. Socket is locked.
960 */
961static void udp_v6_flush_pending_frames(struct sock *sk)
962{
963 struct udp_sock *up = udp_sk(sk);
964
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400965 if (up->pending == AF_INET)
966 udp_flush_pending_frames(sk);
967 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 up->len = 0;
969 up->pending = 0;
970 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972}
973
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000974/**
Ian Morris67ba4152014-08-24 21:53:10 +0100975 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
976 * @sk: socket we are sending on
977 * @skb: sk_buff containing the filled-in UDP header
978 * (checksum field must be zeroed out)
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000979 */
980static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
981 const struct in6_addr *saddr,
982 const struct in6_addr *daddr, int len)
983{
984 unsigned int offset;
985 struct udphdr *uh = udp_hdr(skb);
Vlad Yasevichd39d9382015-01-31 10:40:16 -0500986 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000987 __wsum csum = 0;
988
Vlad Yasevichd39d9382015-01-31 10:40:16 -0500989 if (!frags) {
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000990 /* Only one fragment on the socket. */
991 skb->csum_start = skb_transport_header(skb) - skb->head;
992 skb->csum_offset = offsetof(struct udphdr, check);
993 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
994 } else {
995 /*
996 * HW-checksum won't work as there are two or more
997 * fragments on the socket so that all csums of sk_buffs
998 * should be together
999 */
1000 offset = skb_transport_offset(skb);
1001 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
Subash Abhinov Kasiviswanathandf3b8832017-09-13 17:56:39 -06001002 csum = skb->csum;
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001003
1004 skb->ip_summed = CHECKSUM_NONE;
1005
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001006 do {
1007 csum = csum_add(csum, frags->csum);
1008 } while ((frags = frags->next));
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001009
1010 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1011 csum);
1012 if (uh->check == 0)
1013 uh->check = CSUM_MANGLED_0;
1014 }
1015}
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017/*
1018 * Sending
1019 */
1020
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001021static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022{
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001023 struct sock *sk = skb->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001026 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -08001027 __wsum csum = 0;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001028 int offset = skb_transport_offset(skb);
1029 int len = skb->len - offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031 /*
1032 * Create a UDP header
1033 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001034 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -05001035 uh->source = fl6->fl6_sport;
1036 uh->dest = fl6->fl6_dport;
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001037 uh->len = htons(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 uh->check = 0;
1039
Wang Chenb2bf1e22007-12-03 22:34:16 +11001040 if (is_udplite)
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001041 csum = udplite_csum(skb);
1042 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
Tom Herbert40685792014-05-02 16:29:58 -07001043 skb->ip_summed = CHECKSUM_NONE;
1044 goto send;
1045 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001046 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001047 goto send;
1048 } else
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001049 csum = udp_csum(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001051 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -05001052 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001053 len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -08001055 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Sridhar Samudrala493c6be2009-07-09 08:09:54 +00001057send:
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001058 err = ip6_send_skb(skb);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001059 if (err) {
1060 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
Eric Dumazet6aef70a2016-04-27 16:44:27 -07001061 UDP6_INC_STATS(sock_net(sk),
1062 UDP_MIB_SNDBUFERRORS, is_udplite);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -07001063 err = 0;
1064 }
Eric Dumazet6aef70a2016-04-27 16:44:27 -07001065 } else {
1066 UDP6_INC_STATS(sock_net(sk),
1067 UDP_MIB_OUTDATAGRAMS, is_udplite);
1068 }
Vlad Yasevichd39d9382015-01-31 10:40:16 -05001069 return err;
1070}
1071
1072static int udp_v6_push_pending_frames(struct sock *sk)
1073{
1074 struct sk_buff *skb;
1075 struct udp_sock *up = udp_sk(sk);
1076 struct flowi6 fl6;
1077 int err = 0;
1078
1079 if (up->pending == AF_INET)
1080 return udp_push_pending_frames(sk);
1081
1082 /* ip6_finish_skb will release the cork, so make a copy of
1083 * fl6 here.
1084 */
1085 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1086
1087 skb = ip6_finish_skb(sk);
1088 if (!skb)
1089 goto out;
1090
1091 err = udp_v6_send_skb(skb, &fl6);
1092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093out:
1094 up->len = 0;
1095 up->pending = 0;
1096 return err;
1097}
1098
Ying Xue1b784142015-03-02 15:37:48 +08001099int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100{
1101 struct ipv6_txoptions opt_space;
1102 struct udp_sock *up = udp_sk(sk);
1103 struct inet_sock *inet = inet_sk(sk);
1104 struct ipv6_pinfo *np = inet6_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001105 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001106 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 struct ipv6_txoptions *opt = NULL;
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001108 struct ipv6_txoptions *opt_to_free = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -05001110 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 struct dst_entry *dst;
Wei Wang26879da2016-05-02 21:40:07 -07001112 struct ipcm6_cookie ipc6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 int addr_len = msg->msg_namelen;
1114 int ulen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1116 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001117 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001118 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001119 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Soheil Hassas Yeganehad1e46a2016-04-02 23:08:11 -04001120 struct sockcm_cookie sockc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Wei Wang26879da2016-05-02 21:40:07 -07001122 ipc6.hlimit = -1;
1123 ipc6.tclass = -1;
1124 ipc6.dontfrag = -1;
Alexander Potapenkod80caeb2017-03-21 17:14:27 +01001125 sockc.tsflags = sk->sk_tsflags;
Wei Wang26879da2016-05-02 21:40:07 -07001126
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 /* destination address check */
1128 if (sin6) {
1129 if (addr_len < offsetof(struct sockaddr, sa_data))
1130 return -EINVAL;
1131
1132 switch (sin6->sin6_family) {
1133 case AF_INET6:
1134 if (addr_len < SIN6_LEN_RFC2133)
1135 return -EINVAL;
1136 daddr = &sin6->sin6_addr;
Jonathan T. Leighton12ec2562017-05-23 21:53:33 -04001137 if (ipv6_addr_any(daddr) &&
1138 ipv6_addr_v4mapped(&np->saddr))
1139 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1140 daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 break;
1142 case AF_INET:
1143 goto do_udp_sendmsg;
1144 case AF_UNSPEC:
1145 msg->msg_name = sin6 = NULL;
1146 msg->msg_namelen = addr_len = 0;
1147 daddr = NULL;
1148 break;
1149 default:
1150 return -EINVAL;
1151 }
1152 } else if (!up->pending) {
1153 if (sk->sk_state != TCP_ESTABLISHED)
1154 return -EDESTADDRREQ;
Eric Dumazetefe42082013-10-03 15:42:29 -07001155 daddr = &sk->sk_v6_daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001156 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 daddr = NULL;
1158
1159 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001160 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 struct sockaddr_in sin;
1162 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001163 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1165 msg->msg_name = &sin;
1166 msg->msg_namelen = sizeof(sin);
1167do_udp_sendmsg:
1168 if (__ipv6_only_sock(sk))
1169 return -ENETUNREACH;
Ying Xue1b784142015-03-02 15:37:48 +08001170 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 }
1172 }
1173
1174 if (up->pending == AF_INET)
Ying Xue1b784142015-03-02 15:37:48 +08001175 return udp_sendmsg(sk, msg, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001178 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 */
1180 if (len > INT_MAX - sizeof(struct udphdr))
1181 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001182
Vlad Yasevich03485f22015-01-31 10:40:17 -05001183 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 if (up->pending) {
1185 /*
1186 * There are pending frames.
1187 * The socket lock must be held while it's corked.
1188 */
1189 lock_sock(sk);
1190 if (likely(up->pending)) {
1191 if (unlikely(up->pending != AF_INET6)) {
1192 release_sock(sk);
1193 return -EAFNOSUPPORT;
1194 }
1195 dst = NULL;
1196 goto do_append_data;
1197 }
1198 release_sock(sk);
1199 }
1200 ulen += sizeof(struct udphdr);
1201
David S. Miller4c9483b2011-03-12 16:22:43 -05001202 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204 if (sin6) {
1205 if (sin6->sin6_port == 0)
1206 return -EINVAL;
1207
David S. Miller1958b852011-03-12 16:36:19 -05001208 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 daddr = &sin6->sin6_addr;
1210
1211 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001212 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1213 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1214 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001215 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 }
1218 }
1219
1220 /*
1221 * Otherwise it will be difficult to maintain
1222 * sk->sk_dst_cache.
1223 */
1224 if (sk->sk_state == TCP_ESTABLISHED &&
Eric Dumazetefe42082013-10-03 15:42:29 -07001225 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1226 daddr = &sk->sk_v6_daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
1228 if (addr_len >= sizeof(struct sockaddr_in6) &&
1229 sin6->sin6_scope_id &&
Hannes Frederic Sowa842df072013-03-08 02:07:19 +00001230 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
David S. Miller4c9483b2011-03-12 16:22:43 -05001231 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 } else {
1233 if (sk->sk_state != TCP_ESTABLISHED)
1234 return -EDESTADDRREQ;
1235
David S. Miller1958b852011-03-12 16:36:19 -05001236 fl6.fl6_dport = inet->inet_dport;
Eric Dumazetefe42082013-10-03 15:42:29 -07001237 daddr = &sk->sk_v6_daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001238 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001239 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 }
1241
David S. Miller4c9483b2011-03-12 16:22:43 -05001242 if (!fl6.flowi6_oif)
1243 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
David S. Miller4c9483b2011-03-12 16:22:43 -05001245 if (!fl6.flowi6_oif)
1246 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001247
David S. Miller4c9483b2011-03-12 16:22:43 -05001248 fl6.flowi6_mark = sk->sk_mark;
Lorenzo Colitti50442922016-11-04 02:23:43 +09001249 fl6.flowi6_uid = sk->sk_uid;
Brian Haley51953d52009-10-05 08:24:16 +00001250
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 if (msg->msg_controllen) {
1252 opt = &opt_space;
1253 memset(opt, 0, sizeof(struct ipv6_txoptions));
1254 opt->tot_len = sizeof(*opt);
Wei Wang26879da2016-05-02 21:40:07 -07001255 ipc6.opt = opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
Wei Wang26879da2016-05-02 21:40:07 -07001257 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 if (err < 0) {
1259 fl6_sock_release(flowlabel);
1260 return err;
1261 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001262 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1263 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Ian Morris63159f22015-03-29 14:00:04 +01001264 if (!flowlabel)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 return -EINVAL;
1266 }
1267 if (!(opt->opt_nflen|opt->opt_flen))
1268 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001269 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 }
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001271 if (!opt) {
1272 opt = txopt_get(np);
1273 opt_to_free = opt;
1274 }
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001275 if (flowlabel)
1276 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1277 opt = ipv6_fixup_options(&opt_space, opt);
Wei Wang26879da2016-05-02 21:40:07 -07001278 ipc6.opt = opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279
David S. Miller4c9483b2011-03-12 16:22:43 -05001280 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001281 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001282 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001283 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001284 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1285 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001286 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001287 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001288
David S. Miller4c9483b2011-03-12 16:22:43 -05001289 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001290 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001291 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
David S. Miller4c9483b2011-03-12 16:22:43 -05001293 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1294 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001295 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001296 } else if (!fl6.flowi6_oif)
1297 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
David S. Miller4c9483b2011-03-12 16:22:43 -05001299 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001300
Hannes Frederic Sowa38b70972016-06-11 20:08:19 +02001301 if (ipc6.tclass < 0)
1302 ipc6.tclass = np->tclass;
1303
1304 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1305
Steffen Klassert0e0d44a2013-08-28 08:04:14 +02001306 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001307 if (IS_ERR(dst)) {
1308 err = PTR_ERR(dst);
1309 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
Wei Wang26879da2016-05-02 21:40:07 -07001313 if (ipc6.hlimit < 0)
1314 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315
1316 if (msg->msg_flags&MSG_CONFIRM)
1317 goto do_confirm;
1318back_from_confirm:
1319
Vlad Yasevich03485f22015-01-31 10:40:17 -05001320 /* Lockless fast path for the non-corking case */
1321 if (!corkreq) {
1322 struct sk_buff *skb;
1323
1324 skb = ip6_make_skb(sk, getfrag, msg, ulen,
Wei Wang26879da2016-05-02 21:40:07 -07001325 sizeof(struct udphdr), &ipc6,
Vlad Yasevich03485f22015-01-31 10:40:17 -05001326 &fl6, (struct rt6_info *)dst,
Wei Wang26879da2016-05-02 21:40:07 -07001327 msg->msg_flags, &sockc);
Vlad Yasevich03485f22015-01-31 10:40:17 -05001328 err = PTR_ERR(skb);
1329 if (!IS_ERR_OR_NULL(skb))
1330 err = udp_v6_send_skb(skb, &fl6);
1331 goto release_dst;
1332 }
1333
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 lock_sock(sk);
1335 if (unlikely(up->pending)) {
1336 /* The socket is already corked while preparing it. */
1337 /* ... which is an evident application bug. --ANK */
1338 release_sock(sk);
1339
Joe Perchesba7a46f2014-11-11 10:59:17 -08001340 net_dbg_ratelimited("udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 err = -EINVAL;
1342 goto out;
1343 }
1344
1345 up->pending = AF_INET6;
1346
1347do_append_data:
Wei Wang26879da2016-05-02 21:40:07 -07001348 if (ipc6.dontfrag < 0)
1349 ipc6.dontfrag = np->dontfrag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 up->len += ulen;
Wei Wang26879da2016-05-02 21:40:07 -07001351 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1352 &ipc6, &fl6, (struct rt6_info *)dst,
1353 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (err)
1355 udp_v6_flush_pending_frames(sk);
1356 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001357 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001358 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1359 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Vlad Yasevich03485f22015-01-31 10:40:17 -05001361 if (err > 0)
1362 err = np->recverr ? net_xmit_errno(err) : 0;
1363 release_sock(sk);
1364
1365release_dst:
David S. Millera5e7c212005-10-03 14:21:58 -07001366 if (dst) {
1367 if (connected) {
1368 ip6_dst_store(sk, dst,
Eric Dumazetefe42082013-10-03 15:42:29 -07001369 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1370 &sk->sk_v6_daddr : NULL,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001371#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001372 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001373 &np->saddr :
1374#endif
1375 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001376 } else {
1377 dst_release(dst);
1378 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001379 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001380 }
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001383 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 fl6_sock_release(flowlabel);
Eric Dumazet45f6fad2015-11-29 19:37:57 -08001385 txopt_put(opt_to_free);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001386 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001388 /*
1389 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1390 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1391 * we don't have a good statistic (IpOutDiscards but it can be too many
1392 * things). We could add another new stat but at least for now that
1393 * seems like overkill.
1394 */
1395 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Eric Dumazet6aef70a2016-04-27 16:44:27 -07001396 UDP6_INC_STATS(sock_net(sk),
1397 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 return err;
1400
1401do_confirm:
1402 dst_confirm(dst);
1403 if (!(msg->msg_flags&MSG_PROBE) || len)
1404 goto back_from_confirm;
1405 err = 0;
1406 goto out;
1407}
1408
Brian Haley7d06b2e2008-06-14 17:04:49 -07001409void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
Tom Parkin44046a52013-03-19 06:11:12 +00001411 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 lock_sock(sk);
1413 udp_v6_flush_pending_frames(sk);
1414 release_sock(sk);
1415
Tom Parkin44046a52013-03-19 06:11:12 +00001416 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1417 void (*encap_destroy)(struct sock *sk);
1418 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1419 if (encap_destroy)
1420 encap_destroy(sk);
1421 }
1422
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424}
1425
1426/*
1427 * Socket option code for UDP
1428 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001429int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001430 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001431{
David S. Millerdb8dac22008-03-06 16:22:02 -08001432 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001433 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1434 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001435 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001436}
1437
1438#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001439int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001440 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001441{
David S. Millerdb8dac22008-03-06 16:22:02 -08001442 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001443 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1444 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001445 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001446}
1447#endif
1448
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001449int udpv6_getsockopt(struct sock *sk, int level, int optname,
1450 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001451{
David S. Millerdb8dac22008-03-06 16:22:02 -08001452 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001453 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001454 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001455}
1456
1457#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001458int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1459 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001460{
David S. Millerdb8dac22008-03-06 16:22:02 -08001461 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001462 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001463 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001464}
1465#endif
1466
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001467static const struct inet6_protocol udpv6_protocol = {
subashab@codeaurora.orgf6c002e2017-03-08 16:36:49 -07001468 .early_demux = udp_v6_early_demux,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 .handler = udpv6_rcv,
1470 .err_handler = udpv6_err,
1471 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1472};
1473
1474/* ------------------------------------------------------------------------ */
1475#ifdef CONFIG_PROC_FS
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001476int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477{
Lorenzo Colitti17ef66af2013-05-31 15:05:48 +00001478 if (v == SEQ_START_TOKEN) {
1479 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1480 } else {
1481 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1482 struct inet_sock *inet = inet_sk(v);
1483 __u16 srcp = ntohs(inet->inet_sport);
1484 __u16 destp = ntohs(inet->inet_dport);
1485 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 return 0;
1488}
1489
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001490static const struct file_operations udp6_afinfo_seq_fops = {
1491 .owner = THIS_MODULE,
1492 .open = udp_seq_open,
1493 .read = seq_read,
1494 .llseek = seq_lseek,
1495 .release = seq_release_net
1496};
1497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 .name = "udp6",
1500 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001501 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001502 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001503 .seq_ops = {
1504 .show = udp6_seq_show,
1505 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506};
1507
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001508int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001510 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511}
1512
Ian Morrisec120da2015-08-14 22:43:38 +01001513void udp6_proc_exit(struct net *net)
1514{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001515 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516}
1517#endif /* CONFIG_PROC_FS */
1518
1519/* ------------------------------------------------------------------------ */
1520
1521struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001522 .name = "UDPv6",
1523 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001524 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001525 .connect = ip6_datagram_connect,
1526 .disconnect = udp_disconnect,
1527 .ioctl = udp_ioctl,
1528 .destroy = udpv6_destroy_sock,
1529 .setsockopt = udpv6_setsockopt,
1530 .getsockopt = udpv6_getsockopt,
1531 .sendmsg = udpv6_sendmsg,
1532 .recvmsg = udpv6_recvmsg,
Benjamin LaHaisef7ad74f2012-04-27 08:23:21 +00001533 .backlog_rcv = __udpv6_queue_rcv_skb,
Martin KaFai Laue646b652016-04-11 15:29:37 -07001534 .release_cb = ip6_datagram_release_cb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001535 .hash = udp_lib_hash,
1536 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001537 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001538 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001539 .memory_allocated = &udp_memory_allocated,
1540 .sysctl_mem = sysctl_udp_mem,
1541 .sysctl_wmem = &sysctl_udp_wmem_min,
1542 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001543 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet645ca702008-10-29 01:41:45 -07001544 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001545#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001546 .compat_setsockopt = compat_udpv6_setsockopt,
1547 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001548#endif
David Ahern5d77dca2016-08-23 21:06:33 -07001549 .diag_destroy = udp_abort,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550};
1551
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552static struct inet_protosw udpv6_protosw = {
1553 .type = SOCK_DGRAM,
1554 .protocol = IPPROTO_UDP,
1555 .prot = &udpv6_prot,
1556 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 .flags = INET_PROTOSW_PERMANENT,
1558};
1559
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001560int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001562 int ret;
1563
Vlad Yasevich33362882012-11-15 08:49:15 +00001564 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1565 if (ret)
Vlad Yasevichc6b641a2012-11-15 08:49:22 +00001566 goto out;
Vlad Yasevich33362882012-11-15 08:49:15 +00001567
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001568 ret = inet6_register_protosw(&udpv6_protosw);
1569 if (ret)
1570 goto out_udpv6_protocol;
1571out:
1572 return ret;
1573
1574out_udpv6_protocol:
1575 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1576 goto out;
1577}
1578
Daniel Lezcano09f77092007-12-13 05:34:58 -08001579void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001580{
1581 inet6_unregister_protosw(&udpv6_protosw);
1582 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583}