blob: 37b0699e95e5331dffb186f6971411d2d16c88c8 [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>
48
49#include <linux/proc_fs.h>
50#include <linux/seq_file.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080051#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000053int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
54{
55 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
56 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
Eric Dumazet68835ab2010-11-30 19:04:07 +000057 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
58 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000059 int sk_ipv6only = ipv6_only_sock(sk);
60 int sk2_ipv6only = inet_v6_ipv6only(sk2);
61 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
62 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
63
64 /* if both are mapped, treat as IPv4 */
65 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
Vlad Yasevich499923c2009-04-09 17:37:33 +000066 return (!sk2_ipv6only &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +000067 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
68 sk1_rcv_saddr == sk2_rcv_saddr));
Vlad Yasevichb2f5e7c2009-03-24 16:24:51 +000069
70 if (addr_type2 == IPV6_ADDR_ANY &&
71 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
72 return 1;
73
74 if (addr_type == IPV6_ADDR_ANY &&
75 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
76 return 1;
77
78 if (sk2_rcv_saddr6 &&
79 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
80 return 1;
81
82 return 0;
83}
84
Eric Dumazetd4cada42009-11-08 10:17:30 +000085static unsigned int udp6_portaddr_hash(struct net *net,
86 const struct in6_addr *addr6,
87 unsigned int port)
88{
89 unsigned int hash, mix = net_hash_mix(net);
90
91 if (ipv6_addr_any(addr6))
92 hash = jhash_1word(0, mix);
Brian Haley856540e2009-11-09 12:05:53 +000093 else if (ipv6_addr_v4mapped(addr6))
Eric Dumazet0eae88f2010-04-20 19:06:52 -070094 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000095 else
Eric Dumazet0eae88f2010-04-20 19:06:52 -070096 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
Eric Dumazetd4cada42009-11-08 10:17:30 +000097
98 return hash ^ port;
99}
100
101
Pavel Emelyanov6ba5a3c2008-03-22 16:51:21 -0700102int udp_v6_get_port(struct sock *sk, unsigned short snum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Eric Dumazet30fff922009-11-09 05:26:33 +0000104 unsigned int hash2_nulladdr =
105 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
106 unsigned int hash2_partial =
107 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
108
Eric Dumazetd4cada42009-11-08 10:17:30 +0000109 /* precompute partial secondary hash */
Eric Dumazet30fff922009-11-09 05:26:33 +0000110 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
111 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Eric Dumazet719f8352010-09-08 05:08:44 +0000114static void udp_v6_rehash(struct sock *sk)
115{
116 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
117 &inet6_sk(sk)->rcv_saddr,
118 inet_sk(sk)->inet_num);
119
120 udp_lib_rehash(sk, new_hash);
121}
122
Eric Dumazet645ca702008-10-29 01:41:45 -0700123static inline int compute_score(struct sock *sk, struct net *net,
124 unsigned short hnum,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200125 const struct in6_addr *saddr, __be16 sport,
126 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700127 int dif)
128{
129 int score = -1;
130
Eric Dumazetd4cada42009-11-08 10:17:30 +0000131 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
Eric Dumazet645ca702008-10-29 01:41:45 -0700132 sk->sk_family == PF_INET6) {
133 struct ipv6_pinfo *np = inet6_sk(sk);
134 struct inet_sock *inet = inet_sk(sk);
135
136 score = 0;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000137 if (inet->inet_dport) {
138 if (inet->inet_dport != sport)
Eric Dumazet645ca702008-10-29 01:41:45 -0700139 return -1;
140 score++;
141 }
142 if (!ipv6_addr_any(&np->rcv_saddr)) {
143 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
144 return -1;
145 score++;
146 }
147 if (!ipv6_addr_any(&np->daddr)) {
148 if (!ipv6_addr_equal(&np->daddr, saddr))
149 return -1;
150 score++;
151 }
152 if (sk->sk_bound_dev_if) {
153 if (sk->sk_bound_dev_if != dif)
154 return -1;
155 score++;
156 }
157 }
158 return score;
159}
160
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000161#define SCORE2_MAX (1 + 1 + 1)
162static inline int compute_score2(struct sock *sk, struct net *net,
163 const struct in6_addr *saddr, __be16 sport,
164 const struct in6_addr *daddr, unsigned short hnum,
165 int dif)
166{
167 int score = -1;
168
169 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
170 sk->sk_family == PF_INET6) {
171 struct ipv6_pinfo *np = inet6_sk(sk);
172 struct inet_sock *inet = inet_sk(sk);
173
174 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
175 return -1;
176 score = 0;
177 if (inet->inet_dport) {
178 if (inet->inet_dport != sport)
179 return -1;
180 score++;
181 }
182 if (!ipv6_addr_any(&np->daddr)) {
183 if (!ipv6_addr_equal(&np->daddr, saddr))
184 return -1;
185 score++;
186 }
187 if (sk->sk_bound_dev_if) {
188 if (sk->sk_bound_dev_if != dif)
189 return -1;
190 score++;
191 }
192 }
193 return score;
194}
195
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000196
197/* called with read_rcu_lock() */
198static struct sock *udp6_lib_lookup2(struct net *net,
199 const struct in6_addr *saddr, __be16 sport,
200 const struct in6_addr *daddr, unsigned int hnum, int dif,
201 struct udp_hslot *hslot2, unsigned int slot2)
202{
203 struct sock *sk, *result;
204 struct hlist_nulls_node *node;
205 int score, badness;
206
207begin:
208 result = NULL;
209 badness = -1;
210 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
211 score = compute_score2(sk, net, saddr, sport,
212 daddr, hnum, dif);
213 if (score > badness) {
214 result = sk;
215 badness = score;
216 if (score == SCORE2_MAX)
217 goto exact_match;
218 }
219 }
220 /*
221 * if the nulls value we got at the end of this lookup is
222 * not the expected one, we must restart lookup.
223 * We probably met an item that was moved to another chain.
224 */
225 if (get_nulls_value(node) != slot2)
226 goto begin;
227
228 if (result) {
229exact_match:
Eric Dumazetc31504d2010-11-15 19:58:26 +0000230 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000231 result = NULL;
232 else if (unlikely(compute_score2(result, net, saddr, sport,
233 daddr, hnum, dif) < badness)) {
234 sock_put(result);
235 goto begin;
236 }
237 }
238 return result;
239}
240
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000241struct sock *__udp6_lib_lookup(struct net *net,
Balazs Scheidler88440ae2010-10-21 16:04:33 +0200242 const struct in6_addr *saddr, __be16 sport,
243 const struct in6_addr *daddr, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700244 int dif, struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
Eric Dumazet271b72c2008-10-29 02:11:14 -0700246 struct sock *sk, *result;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800247 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 unsigned short hnum = ntohs(dport);
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000249 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
250 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
Eric Dumazet271b72c2008-10-29 02:11:14 -0700251 int score, badness;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Eric Dumazet271b72c2008-10-29 02:11:14 -0700253 rcu_read_lock();
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000254 if (hslot->count > 10) {
255 hash2 = udp6_portaddr_hash(net, daddr, hnum);
256 slot2 = hash2 & udptable->mask;
257 hslot2 = &udptable->hash2[slot2];
258 if (hslot->count < hslot2->count)
259 goto begin;
260
261 result = udp6_lib_lookup2(net, saddr, sport,
262 daddr, hnum, dif,
263 hslot2, slot2);
264 if (!result) {
265 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
266 slot2 = hash2 & udptable->mask;
267 hslot2 = &udptable->hash2[slot2];
268 if (hslot->count < hslot2->count)
269 goto begin;
270
Jorge Boncompte [DTI2]1223c672010-04-08 04:56:48 +0000271 result = udp6_lib_lookup2(net, saddr, sport,
272 &in6addr_any, hnum, dif,
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000273 hslot2, slot2);
274 }
275 rcu_read_unlock();
276 return result;
277 }
Eric Dumazet271b72c2008-10-29 02:11:14 -0700278begin:
279 result = NULL;
280 badness = -1;
Eric Dumazet88ab1932008-11-16 19:39:21 -0800281 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
Eric Dumazet645ca702008-10-29 01:41:45 -0700282 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
283 if (score > badness) {
284 result = sk;
285 badness = score;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
287 }
Eric Dumazet88ab1932008-11-16 19:39:21 -0800288 /*
289 * if the nulls value we got at the end of this lookup is
290 * not the expected one, we must restart lookup.
291 * We probably met an item that was moved to another chain.
292 */
Eric Dumazetfddc17d2009-11-08 10:18:30 +0000293 if (get_nulls_value(node) != slot)
Eric Dumazet88ab1932008-11-16 19:39:21 -0800294 goto begin;
295
Eric Dumazet271b72c2008-10-29 02:11:14 -0700296 if (result) {
Eric Dumazetc31504d2010-11-15 19:58:26 +0000297 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
Eric Dumazet271b72c2008-10-29 02:11:14 -0700298 result = NULL;
299 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
300 daddr, dport, dif) < badness)) {
301 sock_put(result);
302 goto begin;
303 }
304 }
305 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return result;
307}
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000308EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700310static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
311 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700312 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700313{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700314 struct sock *sk;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000315 const struct ipv6hdr *iph = ipv6_hdr(skb);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700316
KOVACS Krisztian23542612008-10-07 12:41:01 -0700317 if (unlikely(sk = skb_steal_sock(skb)))
318 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000319 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
320 &iph->daddr, dport, inet6_iif(skb),
321 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700322}
323
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200324struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
325 const struct in6_addr *daddr, __be16 dport, int dif)
326{
327 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
328}
329EXPORT_SYMBOL_GPL(udp6_lib_lookup);
330
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 * This should be easy, if there is something there we
334 * return it, otherwise we block.
335 */
336
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800337int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 struct msghdr *msg, size_t len,
339 int noblock, int flags, int *addr_len)
340{
341 struct ipv6_pinfo *np = inet6_sk(sk);
342 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900343 struct sk_buff *skb;
David S. Miller59c2cda2011-12-01 14:12:55 -0500344 unsigned int ulen, copied;
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000345 int peeked, off = 0;
Herbert Xu759e5d02007-03-25 20:10:56 -0700346 int err;
347 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000348 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000349 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900351 if (addr_len)
352 *addr_len=sizeof(struct sockaddr_in6);
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (flags & MSG_ERRQUEUE)
355 return ipv6_recv_error(sk, msg, len);
356
Brian Haley4b340ae2010-04-23 11:26:09 +0000357 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
358 return ipv6_recv_rxpmtu(sk, msg, len);
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800361 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
Pavel Emelyanov3f518bf2012-02-21 07:30:58 +0000362 &peeked, &off, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if (!skb)
364 goto out;
365
Herbert Xu759e5d02007-03-25 20:10:56 -0700366 ulen = skb->len - sizeof(struct udphdr);
David S. Miller59c2cda2011-12-01 14:12:55 -0500367 copied = len;
368 if (copied > ulen)
369 copied = ulen;
370 else if (copied < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900371 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Wei Yongjunf26ba172008-11-02 16:11:01 +0000373 is_udp4 = (skb->protocol == htons(ETH_P_IP));
374
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800375 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700376 * If checksum is needed at all, try to do it while copying the
377 * data. If the data is truncated, or if we only want a partial
378 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800379 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800380
David S. Miller59c2cda2011-12-01 14:12:55 -0500381 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700382 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800384 }
385
Herbert Xu60476372007-04-09 11:59:39 -0700386 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800387 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
David S. Miller59c2cda2011-12-01 14:12:55 -0500388 msg->msg_iov, copied );
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800389 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
391 if (err == -EINVAL)
392 goto csum_copy_err;
393 }
394 if (err)
395 goto out_free;
396
Wei Yongjunf26ba172008-11-02 16:11:01 +0000397 if (!peeked) {
398 if (is_udp4)
399 UDP_INC_STATS_USER(sock_net(sk),
400 UDP_MIB_INDATAGRAMS, is_udplite);
401 else
402 UDP6_INC_STATS_USER(sock_net(sk),
403 UDP_MIB_INDATAGRAMS, is_udplite);
404 }
Wang Chencb759942007-12-03 22:33:28 +1100405
Neil Horman3b885782009-10-12 13:26:31 -0700406 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 /* Copy the address. */
409 if (msg->msg_name) {
410 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 sin6 = (struct sockaddr_in6 *) msg->msg_name;
413 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300414 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 sin6->sin6_flowinfo = 0;
416 sin6->sin6_scope_id = 0;
417
Wei Yongjunf26ba172008-11-02 16:11:01 +0000418 if (is_udp4)
Brian Haleyb301e822009-10-07 13:58:25 -0700419 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
420 &sin6->sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 else {
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000422 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
424 sin6->sin6_scope_id = IP6CB(skb)->iif;
425 }
426
427 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000428 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 if (inet->cmsg_flags)
430 ip_cmsg_recv(msg, skb);
431 } else {
432 if (np->rxopt.all)
433 datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900434 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
David S. Miller59c2cda2011-12-01 14:12:55 -0500436 err = copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700438 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000441 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442out:
443 return err;
444
445csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000446 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000447 if (!skb_kill_datagram(sk, skb, flags)) {
448 if (is_udp4)
449 UDP_INC_STATS_USER(sock_net(sk),
450 UDP_MIB_INERRORS, is_udplite);
451 else
452 UDP6_INC_STATS_USER(sock_net(sk),
453 UDP_MIB_INERRORS, is_udplite);
454 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000455 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Xufeng Zhang32c90252011-06-21 10:43:39 +0000457 if (noblock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 return -EAGAIN;
Xufeng Zhang9cfaa8d2011-06-21 10:43:40 +0000459
460 /* starting over for a new packet */
461 msg->msg_flags &= ~MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 goto try_again;
463}
464
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800465void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700466 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700467 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
469 struct ipv6_pinfo *np;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000470 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
471 const struct in6_addr *saddr = &hdr->saddr;
472 const struct in6_addr *daddr = &hdr->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
474 struct sock *sk;
475 int err;
476
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900477 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800478 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (sk == NULL)
480 return;
481
482 np = inet6_sk(sk);
483
484 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
485 goto out;
486
487 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
488 goto out;
489
Eric Dumazetb1faf562010-05-31 23:44:05 -0700490 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 sk->sk_err = err;
494 sk->sk_error_report(sk);
495out:
496 sock_put(sk);
497}
498
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800499static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700500 struct inet6_skb_parm *opt, u8 type,
501 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
Eric Dumazet645ca702008-10-29 01:41:45 -0700503 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800504}
505
506int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
507{
508 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700509 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100510 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700511
Neil Horman47482f12011-04-06 13:07:09 -0700512 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
Tom Herbertbdeab992011-08-14 19:45:55 +0000513 sock_rps_save_rxhash(sk, skb);
Neil Horman47482f12011-04-06 13:07:09 -0700514
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800515 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
516 goto drop;
517
518 /*
519 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
520 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100521 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800522
523 if (up->pcrlen == 0) { /* full coverage was set */
524 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
525 " %d while full coverage %d requested\n",
526 UDP_SKB_CB(skb)->cscov, skb->len);
527 goto drop;
528 }
529 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
530 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
531 "too small, need min %d\n",
532 UDP_SKB_CB(skb)->cscov, up->pcrlen);
533 goto drop;
534 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 }
536
Eric Dumazet33d480c2011-08-11 19:30:52 +0000537 if (rcu_access_pointer(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800538 if (udp_lib_checksum_complete(skb))
539 goto drop;
540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
Eric Dumazetd826eb12011-11-09 07:24:35 +0000542 skb_dst_drop(skb);
543 rc = sock_queue_rcv_skb(sk, skb);
544 if (rc < 0) {
David S. Millera18135e2006-08-15 00:00:09 -0700545 /* Note that an ENOMEM error is charged twice */
Eric Dumazet766e90372009-10-14 20:40:11 -0700546 if (rc == -ENOMEM)
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700547 UDP6_INC_STATS_BH(sock_net(sk),
548 UDP_MIB_RCVBUFERRORS, is_udplite);
Eric Dumazet8edf19c2009-10-15 00:12:40 +0000549 goto drop_no_sk_drops_inc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 }
Wang Chencb759942007-12-03 22:33:28 +1100551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800553drop:
Eric Dumazet8edf19c2009-10-15 00:12:40 +0000554 atomic_inc(&sk->sk_drops);
555drop_no_sk_drops_inc:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700556 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800557 kfree_skb(skb);
558 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559}
560
Eric Dumazet920a4612008-11-01 21:22:23 -0700561static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000562 __be16 loc_port, const struct in6_addr *loc_addr,
563 __be16 rmt_port, const struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 int dif)
565{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800566 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 struct sock *s = sk;
568 unsigned short num = ntohs(loc_port);
569
Eric Dumazet88ab1932008-11-16 19:39:21 -0800570 sk_nulls_for_each_from(s, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 struct inet_sock *inet = inet_sk(s);
572
Eric Dumazet920a4612008-11-01 21:22:23 -0700573 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800574 continue;
575
Eric Dumazetd4cada42009-11-08 10:17:30 +0000576 if (udp_sk(s)->udp_port_hash == num &&
577 s->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 struct ipv6_pinfo *np = inet6_sk(s);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000579 if (inet->inet_dport) {
580 if (inet->inet_dport != rmt_port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 continue;
582 }
583 if (!ipv6_addr_any(&np->daddr) &&
584 !ipv6_addr_equal(&np->daddr, rmt_addr))
585 continue;
586
587 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
588 continue;
589
590 if (!ipv6_addr_any(&np->rcv_saddr)) {
David L Stevens40796c52005-09-14 21:10:20 -0700591 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
592 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800594 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 continue;
596 return s;
597 }
598 }
599 return NULL;
600}
601
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000602static void flush_stack(struct sock **stack, unsigned int count,
603 struct sk_buff *skb, unsigned int final)
604{
605 unsigned int i;
606 struct sock *sk;
607 struct sk_buff *skb1;
608
609 for (i = 0; i < count; i++) {
610 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
611
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000612 sk = stack[i];
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000613 if (skb1) {
Jiri Pirkoc0722402010-12-09 03:40:30 +0000614 if (sk_rcvqueues_full(sk, skb1)) {
Eric Dumazetc3774112010-04-27 15:13:20 -0700615 kfree_skb(skb1);
616 goto drop;
617 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000618 bh_lock_sock(sk);
619 if (!sock_owned_by_user(sk))
620 udpv6_queue_rcv_skb(sk, skb1);
Zhu Yia3a858f2010-03-04 18:01:47 +0000621 else if (sk_add_backlog(sk, skb1)) {
Zhu Yi55349792010-03-04 18:01:42 +0000622 kfree_skb(skb1);
623 bh_unlock_sock(sk);
624 goto drop;
625 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000626 bh_unlock_sock(sk);
Zhu Yi55349792010-03-04 18:01:42 +0000627 continue;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000628 }
Zhu Yi55349792010-03-04 18:01:42 +0000629drop:
630 atomic_inc(&sk->sk_drops);
631 UDP6_INC_STATS_BH(sock_net(sk),
632 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
633 UDP6_INC_STATS_BH(sock_net(sk),
634 UDP_MIB_INERRORS, IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000635 }
636}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637/*
638 * Note: called only from the BH handler context,
639 * so we don't need to lock the hashes.
640 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700641static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000642 const struct in6_addr *saddr, const struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700643 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000645 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300646 const struct udphdr *uh = udp_hdr(skb);
Eric Dumazetf86dcc52009-10-07 00:37:59 +0000647 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 int dif;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000649 unsigned int i, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Eric Dumazet645ca702008-10-29 01:41:45 -0700651 spin_lock(&hslot->lock);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800652 sk = sk_nulls_head(&hslot->head);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800653 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700654 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000655 while (sk) {
656 stack[count++] = sk;
657 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
658 uh->source, saddr, dif);
659 if (unlikely(count == ARRAY_SIZE(stack))) {
660 if (!sk)
661 break;
662 flush_stack(stack, count, skb, ~0);
663 count = 0;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800664 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000666 /*
667 * before releasing the lock, we must take reference on sockets
668 */
669 for (i = 0; i < count; i++)
670 sock_hold(stack[i]);
671
Eric Dumazet645ca702008-10-29 01:41:45 -0700672 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000673
674 if (count) {
675 flush_stack(stack, count, skb, count - 1);
676
677 for (i = 0; i < count; i++)
678 sock_put(stack[i]);
679 } else {
680 kfree_skb(skb);
681 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800682 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Herbert Xu759e5d02007-03-25 20:10:56 -0700685static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
686 int proto)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800687{
Herbert Xu759e5d02007-03-25 20:10:56 -0700688 int err;
689
690 UDP_SKB_CB(skb)->partial_cov = 0;
691 UDP_SKB_CB(skb)->cscov = skb->len;
692
David S. Millerdb8dac22008-03-06 16:22:02 -0800693 if (proto == IPPROTO_UDPLITE) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700694 err = udplite_checksum_init(skb, uh);
695 if (err)
696 return err;
697 }
698
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800699 if (uh->check == 0) {
700 /* RFC 2460 section 8.1 says that we SHOULD log
701 this error. Well, it is reasonable.
702 */
703 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
704 return 1;
705 }
706 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700707 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700708 skb->len, proto, skb->csum))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800709 skb->ip_summed = CHECKSUM_UNNECESSARY;
710
Herbert Xu60476372007-04-09 11:59:39 -0700711 if (!skb_csum_unnecessary(skb))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700712 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
713 &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700714 skb->len, proto, 0));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800715
Herbert Xu759e5d02007-03-25 20:10:56 -0700716 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800717}
718
Eric Dumazet645ca702008-10-29 01:41:45 -0700719int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700720 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000722 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900724 struct udphdr *uh;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000725 const struct in6_addr *saddr, *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 u32 ulen = 0;
727
728 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000729 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700731 saddr = &ipv6_hdr(skb)->saddr;
732 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300733 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800736 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 goto short_packet;
738
Herbert Xu759e5d02007-03-25 20:10:56 -0700739 if (proto == IPPROTO_UDP) {
740 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800742 /* Check for jumbo payload */
743 if (ulen == 0)
744 ulen = skb->len;
745
746 if (ulen < sizeof(*uh))
747 goto short_packet;
748
749 if (ulen < skb->len) {
750 if (pskb_trim_rcsum(skb, ulen))
751 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700752 saddr = &ipv6_hdr(skb)->saddr;
753 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300754 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800755 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
757
Herbert Xu759e5d02007-03-25 20:10:56 -0700758 if (udp6_csum_init(skb, uh, proto))
759 goto discard;
760
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900761 /*
762 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800764 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700765 return __udp6_lib_mcast_deliver(net, skb,
766 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 /* Unicast */
769
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900770 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 * check socket cache ... must talk to Alan about his plans
772 * for sock caches... i'll skip this for now.
773 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700774 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 if (sk == NULL) {
777 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
778 goto discard;
779
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800780 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 goto discard;
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700782 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
783 proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000785 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800788 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 /* deliver */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900792
Eric Dumazetc3774112010-04-27 15:13:20 -0700793 if (sk_rcvqueues_full(sk, skb)) {
794 sock_put(sk);
795 goto discard;
796 }
Herbert Xud97106e2008-08-09 00:35:05 -0700797 bh_lock_sock(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800798 if (!sock_owned_by_user(sk))
799 udpv6_queue_rcv_skb(sk, skb);
Zhu Yia3a858f2010-03-04 18:01:47 +0000800 else if (sk_add_backlog(sk, skb)) {
Zhu Yi55349792010-03-04 18:01:42 +0000801 atomic_inc(&sk->sk_drops);
802 bh_unlock_sock(sk);
803 sock_put(sk);
804 goto discard;
805 }
Hideo Aoki95766ff2007-12-31 00:29:24 -0800806 bh_unlock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 sock_put(sk);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800808 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900810short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000811 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 -0800812 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000813 saddr,
814 ntohs(uh->source),
815 ulen,
816 skb->len,
817 daddr,
818 ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700821 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800823 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800825
Herbert Xue5bbef22007-10-15 12:50:28 -0700826static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800827{
Eric Dumazet645ca702008-10-29 01:41:45 -0700828 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800829}
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831/*
832 * Throw away all pending data and cancel the corking. Socket is locked.
833 */
834static void udp_v6_flush_pending_frames(struct sock *sk)
835{
836 struct udp_sock *up = udp_sk(sk);
837
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400838 if (up->pending == AF_INET)
839 udp_flush_pending_frames(sk);
840 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 up->len = 0;
842 up->pending = 0;
843 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900844 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845}
846
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000847/**
848 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
849 * @sk: socket we are sending on
850 * @skb: sk_buff containing the filled-in UDP header
851 * (checksum field must be zeroed out)
852 */
853static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
854 const struct in6_addr *saddr,
855 const struct in6_addr *daddr, int len)
856{
857 unsigned int offset;
858 struct udphdr *uh = udp_hdr(skb);
859 __wsum csum = 0;
860
861 if (skb_queue_len(&sk->sk_write_queue) == 1) {
862 /* Only one fragment on the socket. */
863 skb->csum_start = skb_transport_header(skb) - skb->head;
864 skb->csum_offset = offsetof(struct udphdr, check);
865 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
866 } else {
867 /*
868 * HW-checksum won't work as there are two or more
869 * fragments on the socket so that all csums of sk_buffs
870 * should be together
871 */
872 offset = skb_transport_offset(skb);
873 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
874
875 skb->ip_summed = CHECKSUM_NONE;
876
877 skb_queue_walk(&sk->sk_write_queue, skb) {
878 csum = csum_add(csum, skb->csum);
879 }
880
881 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
882 csum);
883 if (uh->check == 0)
884 uh->check = CSUM_MANGLED_0;
885 }
886}
887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888/*
889 * Sending
890 */
891
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800892static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893{
894 struct sk_buff *skb;
895 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800896 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 struct inet_sock *inet = inet_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500898 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100900 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800901 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903 /* Grab the skbuff where UDP header space exists. */
904 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
905 goto out;
906
907 /*
908 * Create a UDP header
909 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300910 uh = udp_hdr(skb);
David S. Miller1958b852011-03-12 16:36:19 -0500911 uh->source = fl6->fl6_sport;
912 uh->dest = fl6->fl6_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 uh->len = htons(up->len);
914 uh->check = 0;
915
Wang Chenb2bf1e22007-12-03 22:34:16 +1100916 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800917 csum = udplite_csum_outgoing(sk, skb);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000918 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
David S. Miller4c9483b2011-03-12 16:22:43 -0500919 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000920 up->len);
921 goto send;
922 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800923 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800925 /* add protocol-dependent pseudo-header */
David S. Miller4c9483b2011-03-12 16:22:43 -0500926 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
927 up->len, fl6->flowi6_proto, csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800929 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000931send:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -0700933 if (err) {
934 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
935 UDP6_INC_STATS_USER(sock_net(sk),
936 UDP_MIB_SNDBUFERRORS, is_udplite);
937 err = 0;
938 }
939 } else
940 UDP6_INC_STATS_USER(sock_net(sk),
941 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942out:
943 up->len = 0;
944 up->pending = 0;
945 return err;
946}
947
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800948int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 struct msghdr *msg, size_t len)
950{
951 struct ipv6_txoptions opt_space;
952 struct udp_sock *up = udp_sk(sk);
953 struct inet_sock *inet = inet_sk(sk);
954 struct ipv6_pinfo *np = inet6_sk(sk);
955 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000956 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 struct ipv6_txoptions *opt = NULL;
958 struct ip6_flowlabel *flowlabel = NULL;
David S. Miller4c9483b2011-03-12 16:22:43 -0500959 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 struct dst_entry *dst;
961 int addr_len = msg->msg_namelen;
962 int ulen = len;
963 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900964 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +0000965 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
967 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700968 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100969 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800970 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
972 /* destination address check */
973 if (sin6) {
974 if (addr_len < offsetof(struct sockaddr, sa_data))
975 return -EINVAL;
976
977 switch (sin6->sin6_family) {
978 case AF_INET6:
979 if (addr_len < SIN6_LEN_RFC2133)
980 return -EINVAL;
981 daddr = &sin6->sin6_addr;
982 break;
983 case AF_INET:
984 goto do_udp_sendmsg;
985 case AF_UNSPEC:
986 msg->msg_name = sin6 = NULL;
987 msg->msg_namelen = addr_len = 0;
988 daddr = NULL;
989 break;
990 default:
991 return -EINVAL;
992 }
993 } else if (!up->pending) {
994 if (sk->sk_state != TCP_ESTABLISHED)
995 return -EDESTADDRREQ;
996 daddr = &np->daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900997 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 daddr = NULL;
999
1000 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -07001001 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 struct sockaddr_in sin;
1003 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001004 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1006 msg->msg_name = &sin;
1007 msg->msg_namelen = sizeof(sin);
1008do_udp_sendmsg:
1009 if (__ipv6_only_sock(sk))
1010 return -ENETUNREACH;
1011 return udp_sendmsg(iocb, sk, msg, len);
1012 }
1013 }
1014
1015 if (up->pending == AF_INET)
1016 return udp_sendmsg(iocb, sk, msg, len);
1017
1018 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001019 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 */
1021 if (len > INT_MAX - sizeof(struct udphdr))
1022 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 if (up->pending) {
1025 /*
1026 * There are pending frames.
1027 * The socket lock must be held while it's corked.
1028 */
1029 lock_sock(sk);
1030 if (likely(up->pending)) {
1031 if (unlikely(up->pending != AF_INET6)) {
1032 release_sock(sk);
1033 return -EAFNOSUPPORT;
1034 }
1035 dst = NULL;
1036 goto do_append_data;
1037 }
1038 release_sock(sk);
1039 }
1040 ulen += sizeof(struct udphdr);
1041
David S. Miller4c9483b2011-03-12 16:22:43 -05001042 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
1044 if (sin6) {
1045 if (sin6->sin6_port == 0)
1046 return -EINVAL;
1047
David S. Miller1958b852011-03-12 16:36:19 -05001048 fl6.fl6_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 daddr = &sin6->sin6_addr;
1050
1051 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001052 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1053 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1054 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 if (flowlabel == NULL)
1056 return -EINVAL;
1057 daddr = &flowlabel->dst;
1058 }
1059 }
1060
1061 /*
1062 * Otherwise it will be difficult to maintain
1063 * sk->sk_dst_cache.
1064 */
1065 if (sk->sk_state == TCP_ESTABLISHED &&
1066 ipv6_addr_equal(daddr, &np->daddr))
1067 daddr = &np->daddr;
1068
1069 if (addr_len >= sizeof(struct sockaddr_in6) &&
1070 sin6->sin6_scope_id &&
1071 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
David S. Miller4c9483b2011-03-12 16:22:43 -05001072 fl6.flowi6_oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 } else {
1074 if (sk->sk_state != TCP_ESTABLISHED)
1075 return -EDESTADDRREQ;
1076
David S. Miller1958b852011-03-12 16:36:19 -05001077 fl6.fl6_dport = inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 daddr = &np->daddr;
David S. Miller4c9483b2011-03-12 16:22:43 -05001079 fl6.flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001080 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 }
1082
David S. Miller4c9483b2011-03-12 16:22:43 -05001083 if (!fl6.flowi6_oif)
1084 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085
David S. Miller4c9483b2011-03-12 16:22:43 -05001086 if (!fl6.flowi6_oif)
1087 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
Yang Hongyang9f690db2008-12-16 02:08:29 -08001088
David S. Miller4c9483b2011-03-12 16:22:43 -05001089 fl6.flowi6_mark = sk->sk_mark;
Brian Haley51953d52009-10-05 08:24:16 +00001090
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 if (msg->msg_controllen) {
1092 opt = &opt_space;
1093 memset(opt, 0, sizeof(struct ipv6_txoptions));
1094 opt->tot_len = sizeof(*opt);
1095
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +00001096 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1097 &hlimit, &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 if (err < 0) {
1099 fl6_sock_release(flowlabel);
1100 return err;
1101 }
David S. Miller4c9483b2011-03-12 16:22:43 -05001102 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1103 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 if (flowlabel == NULL)
1105 return -EINVAL;
1106 }
1107 if (!(opt->opt_nflen|opt->opt_flen))
1108 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001109 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 }
1111 if (opt == NULL)
1112 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001113 if (flowlabel)
1114 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1115 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
David S. Miller4c9483b2011-03-12 16:22:43 -05001117 fl6.flowi6_proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001118 if (!ipv6_addr_any(daddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001119 fl6.daddr = *daddr;
Brian Haley876c7f42008-04-11 00:38:24 -04001120 else
David S. Miller4c9483b2011-03-12 16:22:43 -05001121 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1122 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001123 fl6.saddr = np->saddr;
David S. Miller1958b852011-03-12 16:36:19 -05001124 fl6.fl6_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001125
David S. Miller4c9483b2011-03-12 16:22:43 -05001126 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001127 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001128 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
David S. Miller4c9483b2011-03-12 16:22:43 -05001130 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1131 fl6.flowi6_oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001132 connected = 0;
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001133 } else if (!fl6.flowi6_oif)
1134 fl6.flowi6_oif = np->ucast_oif;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
David S. Miller4c9483b2011-03-12 16:22:43 -05001136 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001137
David S. Miller4c9483b2011-03-12 16:22:43 -05001138 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -08001139 if (IS_ERR(dst)) {
1140 err = PTR_ERR(dst);
1141 dst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 goto out;
David S. Miller14e50e52007-05-24 18:17:54 -07001143 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
1145 if (hlimit < 0) {
David S. Miller4c9483b2011-03-12 16:22:43 -05001146 if (ipv6_addr_is_multicast(&fl6.daddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 hlimit = np->mcast_hops;
1148 else
1149 hlimit = np->hop_limit;
1150 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001151 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 }
1153
Gerrit Renkere651f032009-08-09 08:12:48 +00001154 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001155 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001156
Brian Haley13b52cd2010-04-23 11:26:08 +00001157 if (dontfrag < 0)
1158 dontfrag = np->dontfrag;
1159
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 if (msg->msg_flags&MSG_CONFIRM)
1161 goto do_confirm;
1162back_from_confirm:
1163
1164 lock_sock(sk);
1165 if (unlikely(up->pending)) {
1166 /* The socket is already corked while preparing it. */
1167 /* ... which is an evident application bug. --ANK */
1168 release_sock(sk);
1169
Patrick McHardy64ce2072005-08-09 20:50:53 -07001170 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 err = -EINVAL;
1172 goto out;
1173 }
1174
1175 up->pending = AF_INET6;
1176
1177do_append_data:
1178 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001179 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1180 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
David S. Miller4c9483b2011-03-12 16:22:43 -05001181 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001182 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001183 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 if (err)
1185 udp_v6_flush_pending_frames(sk);
1186 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001187 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001188 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1189 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
David S. Millera5e7c212005-10-03 14:21:58 -07001191 if (dst) {
1192 if (connected) {
1193 ip6_dst_store(sk, dst,
David S. Miller4c9483b2011-03-12 16:22:43 -05001194 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001195 &np->daddr : NULL,
1196#ifdef CONFIG_IPV6_SUBTREES
David S. Miller4c9483b2011-03-12 16:22:43 -05001197 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001198 &np->saddr :
1199#endif
1200 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001201 } else {
1202 dst_release(dst);
1203 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001204 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001205 }
1206
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 if (err > 0)
1208 err = np->recverr ? net_xmit_errno(err) : 0;
1209 release_sock(sk);
1210out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001211 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001213 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001215 /*
1216 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1217 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1218 * we don't have a good statistic (IpOutDiscards but it can be too many
1219 * things). We could add another new stat but at least for now that
1220 * seems like overkill.
1221 */
1222 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001223 UDP6_INC_STATS_USER(sock_net(sk),
1224 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001225 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 return err;
1227
1228do_confirm:
1229 dst_confirm(dst);
1230 if (!(msg->msg_flags&MSG_PROBE) || len)
1231 goto back_from_confirm;
1232 err = 0;
1233 goto out;
1234}
1235
Brian Haley7d06b2e2008-06-14 17:04:49 -07001236void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237{
1238 lock_sock(sk);
1239 udp_v6_flush_pending_frames(sk);
1240 release_sock(sk);
1241
1242 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243}
1244
1245/*
1246 * Socket option code for UDP
1247 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001248int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001249 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001250{
David S. Millerdb8dac22008-03-06 16:22:02 -08001251 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001252 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1253 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001254 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001255}
1256
1257#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001258int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001259 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001260{
David S. Millerdb8dac22008-03-06 16:22:02 -08001261 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001262 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1263 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001264 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001265}
1266#endif
1267
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001268int udpv6_getsockopt(struct sock *sk, int level, int optname,
1269 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001270{
David S. Millerdb8dac22008-03-06 16:22:02 -08001271 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001272 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001273 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001274}
1275
1276#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001277int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1278 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001279{
David S. Millerdb8dac22008-03-06 16:22:02 -08001280 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001281 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001282 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001283}
1284#endif
1285
Sridhar Samudralaba735422009-07-09 08:10:04 +00001286static int udp6_ufo_send_check(struct sk_buff *skb)
1287{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001288 const struct ipv6hdr *ipv6h;
Sridhar Samudralaba735422009-07-09 08:10:04 +00001289 struct udphdr *uh;
1290
1291 if (!pskb_may_pull(skb, sizeof(*uh)))
1292 return -EINVAL;
1293
1294 ipv6h = ipv6_hdr(skb);
1295 uh = udp_hdr(skb);
1296
1297 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1298 IPPROTO_UDP, 0);
1299 skb->csum_start = skb_transport_header(skb) - skb->head;
1300 skb->csum_offset = offsetof(struct udphdr, check);
1301 skb->ip_summed = CHECKSUM_PARTIAL;
1302 return 0;
1303}
1304
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001305static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
1306 netdev_features_t features)
Sridhar Samudralaba735422009-07-09 08:10:04 +00001307{
1308 struct sk_buff *segs = ERR_PTR(-EINVAL);
1309 unsigned int mss;
1310 unsigned int unfrag_ip6hlen, unfrag_len;
1311 struct frag_hdr *fptr;
1312 u8 *mac_start, *prevhdr;
1313 u8 nexthdr;
1314 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1315 int offset;
1316 __wsum csum;
1317
1318 mss = skb_shinfo(skb)->gso_size;
1319 if (unlikely(skb->len <= mss))
1320 goto out;
1321
1322 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1323 /* Packet is from an untrusted source, reset gso_segs. */
1324 int type = skb_shinfo(skb)->gso_type;
1325
1326 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1327 !(type & (SKB_GSO_UDP))))
1328 goto out;
1329
1330 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1331
1332 segs = NULL;
1333 goto out;
1334 }
1335
1336 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1337 * do checksum of UDP packets sent as multiple IP fragments.
1338 */
Shan Wei96339d62011-04-22 19:07:41 +08001339 offset = skb_checksum_start_offset(skb);
Sridhar Samudralaba735422009-07-09 08:10:04 +00001340 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1341 offset += skb->csum_offset;
1342 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1343 skb->ip_summed = CHECKSUM_NONE;
1344
1345 /* Check if there is enough headroom to insert fragment header. */
Shan Weia9cf73e2011-04-19 22:52:49 +00001346 if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) &&
Sridhar Samudralaba735422009-07-09 08:10:04 +00001347 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1348 goto out;
1349
1350 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1351 * bytes to insert fragment header.
1352 */
1353 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1354 nexthdr = *prevhdr;
1355 *prevhdr = NEXTHDR_FRAGMENT;
1356 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1357 unfrag_ip6hlen;
1358 mac_start = skb_mac_header(skb);
1359 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1360
1361 skb->mac_header -= frag_hdr_sz;
1362 skb->network_header -= frag_hdr_sz;
1363
1364 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1365 fptr->nexthdr = nexthdr;
1366 fptr->reserved = 0;
Eric Dumazet87c48fa2011-07-21 21:25:58 -07001367 ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb));
Sridhar Samudralaba735422009-07-09 08:10:04 +00001368
1369 /* Fragment the skb. ipv6 header and the remaining fields of the
1370 * fragment header are updated in ipv6_gso_segment()
1371 */
1372 segs = skb_segment(skb, features);
1373
1374out:
1375 return segs;
1376}
1377
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001378static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 .handler = udpv6_rcv,
1380 .err_handler = udpv6_err,
Sridhar Samudralaba735422009-07-09 08:10:04 +00001381 .gso_send_check = udp6_ufo_send_check,
1382 .gso_segment = udp6_ufo_fragment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1384};
1385
1386/* ------------------------------------------------------------------------ */
1387#ifdef CONFIG_PROC_FS
1388
1389static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1390{
1391 struct inet_sock *inet = inet_sk(sp);
1392 struct ipv6_pinfo *np = inet6_sk(sp);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001393 const struct in6_addr *dest, *src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 __u16 destp, srcp;
1395
1396 dest = &np->daddr;
1397 src = &np->rcv_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001398 destp = ntohs(inet->inet_dport);
1399 srcp = ntohs(inet->inet_sport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 seq_printf(seq,
Eric Dumazetf86dcc52009-10-07 00:37:59 +00001401 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
Dan Rosenberg71338aa2011-05-23 12:17:35 +00001402 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 bucket,
1404 src->s6_addr32[0], src->s6_addr32[1],
1405 src->s6_addr32[2], src->s6_addr32[3], srcp,
1406 dest->s6_addr32[0], dest->s6_addr32[1],
1407 dest->s6_addr32[2], dest->s6_addr32[3], destp,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001408 sp->sk_state,
Eric Dumazet31e6d362009-06-17 19:05:41 -07001409 sk_wmem_alloc_get(sp),
1410 sk_rmem_alloc_get(sp),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 0, 0L, 0,
1412 sock_i_uid(sp), 0,
1413 sock_i_ino(sp),
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001414 atomic_read(&sp->sk_refcnt), sp,
1415 atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416}
1417
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001418int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419{
1420 if (v == SEQ_START_TOKEN)
1421 seq_printf(seq,
1422 " sl "
1423 "local_address "
1424 "remote_address "
1425 "st tx_queue rx_queue tr tm->when retrnsmt"
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001426 " uid timeout inode ref pointer drops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 else
1428 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1429 return 0;
1430}
1431
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001432static const struct file_operations udp6_afinfo_seq_fops = {
1433 .owner = THIS_MODULE,
1434 .open = udp_seq_open,
1435 .read = seq_read,
1436 .llseek = seq_lseek,
1437 .release = seq_release_net
1438};
1439
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 .name = "udp6",
1442 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001443 .udp_table = &udp_table,
Arjan van de Ven73cb88e2011-10-30 06:46:30 +00001444 .seq_fops = &udp6_afinfo_seq_fops,
Denis V. Lunevdda61922008-03-28 18:24:26 -07001445 .seq_ops = {
1446 .show = udp6_seq_show,
1447 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448};
1449
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001450int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001452 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453}
1454
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001455void udp6_proc_exit(struct net *net) {
1456 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457}
1458#endif /* CONFIG_PROC_FS */
1459
1460/* ------------------------------------------------------------------------ */
1461
1462struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001463 .name = "UDPv6",
1464 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001465 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001466 .connect = ip6_datagram_connect,
1467 .disconnect = udp_disconnect,
1468 .ioctl = udp_ioctl,
1469 .destroy = udpv6_destroy_sock,
1470 .setsockopt = udpv6_setsockopt,
1471 .getsockopt = udpv6_getsockopt,
1472 .sendmsg = udpv6_sendmsg,
1473 .recvmsg = udpv6_recvmsg,
1474 .backlog_rcv = udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001475 .hash = udp_lib_hash,
1476 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001477 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001478 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001479 .memory_allocated = &udp_memory_allocated,
1480 .sysctl_mem = sysctl_udp_mem,
1481 .sysctl_wmem = &sysctl_udp_wmem_min,
1482 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001483 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001484 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001485 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001486#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001487 .compat_setsockopt = compat_udpv6_setsockopt,
1488 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001489#endif
Octavian Purdilafcbdf092010-12-16 14:26:56 -08001490 .clear_sk = sk_prot_clear_portaddr_nulls,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491};
1492
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493static struct inet_protosw udpv6_protosw = {
1494 .type = SOCK_DGRAM,
1495 .protocol = IPPROTO_UDP,
1496 .prot = &udpv6_prot,
1497 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 .no_check = UDP_CSUM_DEFAULT,
1499 .flags = INET_PROTOSW_PERMANENT,
1500};
1501
1502
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001503int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001505 int ret;
1506
1507 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1508 if (ret)
1509 goto out;
1510
1511 ret = inet6_register_protosw(&udpv6_protosw);
1512 if (ret)
1513 goto out_udpv6_protocol;
1514out:
1515 return ret;
1516
1517out_udpv6_protocol:
1518 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1519 goto out;
1520}
1521
Daniel Lezcano09f77092007-12-13 05:34:58 -08001522void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001523{
1524 inet6_unregister_protosw(&udpv6_protosw);
1525 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526}