blob: 9a009c66c8a3dd549262aeeb392bf68ec60c5fd4 [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 Emelyanovfa4d3c62008-01-31 05:07:57 -0800241static struct 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}
308
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700309static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
310 __be16 sport, __be16 dport,
Eric Dumazet645ca702008-10-29 01:41:45 -0700311 struct udp_table *udptable)
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700312{
KOVACS Krisztian23542612008-10-07 12:41:01 -0700313 struct sock *sk;
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700314 struct ipv6hdr *iph = ipv6_hdr(skb);
315
KOVACS Krisztian23542612008-10-07 12:41:01 -0700316 if (unlikely(sk = skb_steal_sock(skb)))
317 return sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000318 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
319 &iph->daddr, dport, inet6_iif(skb),
320 udptable);
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700321}
322
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200323struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
324 const struct in6_addr *daddr, __be16 dport, int dif)
325{
326 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
327}
328EXPORT_SYMBOL_GPL(udp6_lib_lookup);
329
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 * This should be easy, if there is something there we
333 * return it, otherwise we block.
334 */
335
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800336int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 struct msghdr *msg, size_t len,
338 int noblock, int flags, int *addr_len)
339{
340 struct ipv6_pinfo *np = inet6_sk(sk);
341 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900342 struct sk_buff *skb;
Gerrit Renker81d54ec2010-02-10 20:26:19 +0000343 unsigned int ulen;
Herbert Xua59322b2007-12-05 01:53:40 -0800344 int peeked;
Herbert Xu759e5d02007-03-25 20:10:56 -0700345 int err;
346 int is_udplite = IS_UDPLITE(sk);
Wei Yongjunf26ba172008-11-02 16:11:01 +0000347 int is_udp4;
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000348 bool slow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900350 if (addr_len)
351 *addr_len=sizeof(struct sockaddr_in6);
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 if (flags & MSG_ERRQUEUE)
354 return ipv6_recv_error(sk, msg, len);
355
Brian Haley4b340ae2010-04-23 11:26:09 +0000356 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
357 return ipv6_recv_rxpmtu(sk, msg, len);
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359try_again:
Herbert Xua59322b2007-12-05 01:53:40 -0800360 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
361 &peeked, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (!skb)
363 goto out;
364
Herbert Xu759e5d02007-03-25 20:10:56 -0700365 ulen = skb->len - sizeof(struct udphdr);
Gerrit Renker81d54ec2010-02-10 20:26:19 +0000366 if (len > ulen)
367 len = ulen;
368 else if (len < ulen)
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900369 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Wei Yongjunf26ba172008-11-02 16:11:01 +0000371 is_udp4 = (skb->protocol == htons(ETH_P_IP));
372
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800373 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700374 * If checksum is needed at all, try to do it while copying the
375 * data. If the data is truncated, or if we only want a partial
376 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800377 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800378
Gerrit Renker81d54ec2010-02-10 20:26:19 +0000379 if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700380 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800382 }
383
Herbert Xu60476372007-04-09 11:59:39 -0700384 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800385 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
Gerrit Renker81d54ec2010-02-10 20:26:19 +0000386 msg->msg_iov,len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800387 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
389 if (err == -EINVAL)
390 goto csum_copy_err;
391 }
392 if (err)
393 goto out_free;
394
Wei Yongjunf26ba172008-11-02 16:11:01 +0000395 if (!peeked) {
396 if (is_udp4)
397 UDP_INC_STATS_USER(sock_net(sk),
398 UDP_MIB_INDATAGRAMS, is_udplite);
399 else
400 UDP6_INC_STATS_USER(sock_net(sk),
401 UDP_MIB_INDATAGRAMS, is_udplite);
402 }
Wang Chencb759942007-12-03 22:33:28 +1100403
Neil Horman3b885782009-10-12 13:26:31 -0700404 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 /* Copy the address. */
407 if (msg->msg_name) {
408 struct sockaddr_in6 *sin6;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 sin6 = (struct sockaddr_in6 *) msg->msg_name;
411 sin6->sin6_family = AF_INET6;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300412 sin6->sin6_port = udp_hdr(skb)->source;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 sin6->sin6_flowinfo = 0;
414 sin6->sin6_scope_id = 0;
415
Wei Yongjunf26ba172008-11-02 16:11:01 +0000416 if (is_udp4)
Brian Haleyb301e822009-10-07 13:58:25 -0700417 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
418 &sin6->sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 else {
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700420 ipv6_addr_copy(&sin6->sin6_addr,
421 &ipv6_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
423 sin6->sin6_scope_id = IP6CB(skb)->iif;
424 }
425
426 }
Wei Yongjunf26ba172008-11-02 16:11:01 +0000427 if (is_udp4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (inet->cmsg_flags)
429 ip_cmsg_recv(msg, skb);
430 } else {
431 if (np->rxopt.all)
432 datagram_recv_ctl(sk, msg, skb);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Gerrit Renker81d54ec2010-02-10 20:26:19 +0000435 err = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700437 err = ulen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439out_free:
Eric Dumazet9d410c72009-10-30 05:03:53 +0000440 skb_free_datagram_locked(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441out:
442 return err;
443
444csum_copy_err:
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000445 slow = lock_sock_fast(sk);
Wei Yongjun0856f932008-11-02 16:14:27 +0000446 if (!skb_kill_datagram(sk, skb, flags)) {
447 if (is_udp4)
448 UDP_INC_STATS_USER(sock_net(sk),
449 UDP_MIB_INERRORS, is_udplite);
450 else
451 UDP6_INC_STATS_USER(sock_net(sk),
452 UDP_MIB_INERRORS, is_udplite);
453 }
Eric Dumazet8a74ad62010-05-26 19:20:18 +0000454 unlock_sock_fast(sk, slow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Mitsuru Chinen7a0ff7162007-11-05 21:29:17 -0800456 if (flags & MSG_DONTWAIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 goto try_again;
459}
460
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800461void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700462 u8 type, u8 code, int offset, __be32 info,
Eric Dumazet645ca702008-10-29 01:41:45 -0700463 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
465 struct ipv6_pinfo *np;
466 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 struct in6_addr *saddr = &hdr->saddr;
468 struct in6_addr *daddr = &hdr->daddr;
469 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
470 struct sock *sk;
471 int err;
472
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900473 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800474 saddr, uh->source, inet6_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (sk == NULL)
476 return;
477
478 np = inet6_sk(sk);
479
480 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
481 goto out;
482
483 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
484 goto out;
485
Eric Dumazetb1faf562010-05-31 23:44:05 -0700486 if (np->recverr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
Eric Dumazetb1faf562010-05-31 23:44:05 -0700488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 sk->sk_err = err;
490 sk->sk_error_report(sk);
491out:
492 sock_put(sk);
493}
494
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800495static __inline__ void udpv6_err(struct sk_buff *skb,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700496 struct inet6_skb_parm *opt, u8 type,
497 u8 code, int offset, __be32 info )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
Eric Dumazet645ca702008-10-29 01:41:45 -0700499 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800500}
501
502int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
503{
504 struct udp_sock *up = udp_sk(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700505 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100506 int is_udplite = IS_UDPLITE(sk);
David S. Millera18135e2006-08-15 00:00:09 -0700507
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800508 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
509 goto drop;
510
511 /*
512 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
513 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100514 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800515
516 if (up->pcrlen == 0) { /* full coverage was set */
517 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
518 " %d while full coverage %d requested\n",
519 UDP_SKB_CB(skb)->cscov, skb->len);
520 goto drop;
521 }
522 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
523 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
524 "too small, need min %d\n",
525 UDP_SKB_CB(skb)->cscov, up->pcrlen);
526 goto drop;
527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529
Eric Dumazet0d7da9d2010-10-25 03:47:05 +0000530 if (rcu_dereference_raw(sk->sk_filter)) {
Herbert Xu1ab6eb62007-03-06 20:29:58 -0800531 if (udp_lib_checksum_complete(skb))
532 goto drop;
533 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Eric Dumazetf84af322010-04-28 15:31:51 -0700535 if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) {
David S. Millera18135e2006-08-15 00:00:09 -0700536 /* Note that an ENOMEM error is charged twice */
Eric Dumazet766e90372009-10-14 20:40:11 -0700537 if (rc == -ENOMEM)
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700538 UDP6_INC_STATS_BH(sock_net(sk),
539 UDP_MIB_RCVBUFERRORS, is_udplite);
Eric Dumazet8edf19c2009-10-15 00:12:40 +0000540 goto drop_no_sk_drops_inc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
Wang Chencb759942007-12-03 22:33:28 +1100542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800544drop:
Eric Dumazet8edf19c2009-10-15 00:12:40 +0000545 atomic_inc(&sk->sk_drops);
546drop_no_sk_drops_inc:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700547 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800548 kfree_skb(skb);
549 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}
551
Eric Dumazet920a4612008-11-01 21:22:23 -0700552static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
Al Viroe69a4adc2006-11-14 20:56:00 -0800553 __be16 loc_port, struct in6_addr *loc_addr,
554 __be16 rmt_port, struct in6_addr *rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 int dif)
556{
Eric Dumazet88ab1932008-11-16 19:39:21 -0800557 struct hlist_nulls_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 struct sock *s = sk;
559 unsigned short num = ntohs(loc_port);
560
Eric Dumazet88ab1932008-11-16 19:39:21 -0800561 sk_nulls_for_each_from(s, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct inet_sock *inet = inet_sk(s);
563
Eric Dumazet920a4612008-11-01 21:22:23 -0700564 if (!net_eq(sock_net(s), net))
Daniel Lezcanob8ad0cb2008-03-07 11:16:55 -0800565 continue;
566
Eric Dumazetd4cada42009-11-08 10:17:30 +0000567 if (udp_sk(s)->udp_port_hash == num &&
568 s->sk_family == PF_INET6) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 struct ipv6_pinfo *np = inet6_sk(s);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000570 if (inet->inet_dport) {
571 if (inet->inet_dport != rmt_port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 continue;
573 }
574 if (!ipv6_addr_any(&np->daddr) &&
575 !ipv6_addr_equal(&np->daddr, rmt_addr))
576 continue;
577
578 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
579 continue;
580
581 if (!ipv6_addr_any(&np->rcv_saddr)) {
David L Stevens40796c52005-09-14 21:10:20 -0700582 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
583 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 }
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800585 if (!inet6_mc_check(s, loc_addr, rmt_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 continue;
587 return s;
588 }
589 }
590 return NULL;
591}
592
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000593static void flush_stack(struct sock **stack, unsigned int count,
594 struct sk_buff *skb, unsigned int final)
595{
596 unsigned int i;
597 struct sock *sk;
598 struct sk_buff *skb1;
599
600 for (i = 0; i < count; i++) {
601 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
602
Eric Dumazetf6b8f322009-11-08 10:20:19 +0000603 sk = stack[i];
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000604 if (skb1) {
Jiri Pirkoc0722402010-12-09 03:40:30 +0000605 if (sk_rcvqueues_full(sk, skb1)) {
Eric Dumazetc3774112010-04-27 15:13:20 -0700606 kfree_skb(skb1);
607 goto drop;
608 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000609 bh_lock_sock(sk);
610 if (!sock_owned_by_user(sk))
611 udpv6_queue_rcv_skb(sk, skb1);
Zhu Yia3a858f2010-03-04 18:01:47 +0000612 else if (sk_add_backlog(sk, skb1)) {
Zhu Yi55349792010-03-04 18:01:42 +0000613 kfree_skb(skb1);
614 bh_unlock_sock(sk);
615 goto drop;
616 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000617 bh_unlock_sock(sk);
Zhu Yi55349792010-03-04 18:01:42 +0000618 continue;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000619 }
Zhu Yi55349792010-03-04 18:01:42 +0000620drop:
621 atomic_inc(&sk->sk_drops);
622 UDP6_INC_STATS_BH(sock_net(sk),
623 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
624 UDP6_INC_STATS_BH(sock_net(sk),
625 UDP_MIB_INERRORS, IS_UDPLITE(sk));
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000626 }
627}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628/*
629 * Note: called only from the BH handler context,
630 * so we don't need to lock the hashes.
631 */
Pavel Emelyanove3163492008-06-16 17:12:11 -0700632static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
633 struct in6_addr *saddr, struct in6_addr *daddr,
Eric Dumazet645ca702008-10-29 01:41:45 -0700634 struct udp_table *udptable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000636 struct sock *sk, *stack[256 / sizeof(struct sock *)];
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300637 const struct udphdr *uh = udp_hdr(skb);
Eric Dumazetf86dcc52009-10-07 00:37:59 +0000638 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 int dif;
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000640 unsigned int i, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Eric Dumazet645ca702008-10-29 01:41:45 -0700642 spin_lock(&hslot->lock);
Eric Dumazet88ab1932008-11-16 19:39:21 -0800643 sk = sk_nulls_head(&hslot->head);
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800644 dif = inet6_iif(skb);
Eric Dumazet920a4612008-11-01 21:22:23 -0700645 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000646 while (sk) {
647 stack[count++] = sk;
648 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
649 uh->source, saddr, dif);
650 if (unlikely(count == ARRAY_SIZE(stack))) {
651 if (!sk)
652 break;
653 flush_stack(stack, count, skb, ~0);
654 count = 0;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800655 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 }
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000657 /*
658 * before releasing the lock, we must take reference on sockets
659 */
660 for (i = 0; i < count; i++)
661 sock_hold(stack[i]);
662
Eric Dumazet645ca702008-10-29 01:41:45 -0700663 spin_unlock(&hslot->lock);
Eric Dumazeta1ab77f2009-11-08 10:18:52 +0000664
665 if (count) {
666 flush_stack(stack, count, skb, count - 1);
667
668 for (i = 0; i < count; i++)
669 sock_put(stack[i]);
670 } else {
671 kfree_skb(skb);
672 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800673 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
Herbert Xu759e5d02007-03-25 20:10:56 -0700676static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
677 int proto)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800678{
Herbert Xu759e5d02007-03-25 20:10:56 -0700679 int err;
680
681 UDP_SKB_CB(skb)->partial_cov = 0;
682 UDP_SKB_CB(skb)->cscov = skb->len;
683
David S. Millerdb8dac22008-03-06 16:22:02 -0800684 if (proto == IPPROTO_UDPLITE) {
Herbert Xu759e5d02007-03-25 20:10:56 -0700685 err = udplite_checksum_init(skb, uh);
686 if (err)
687 return err;
688 }
689
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800690 if (uh->check == 0) {
691 /* RFC 2460 section 8.1 says that we SHOULD log
692 this error. Well, it is reasonable.
693 */
694 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
695 return 1;
696 }
697 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700698 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700699 skb->len, proto, skb->csum))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800700 skb->ip_summed = CHECKSUM_UNNECESSARY;
701
Herbert Xu60476372007-04-09 11:59:39 -0700702 if (!skb_csum_unnecessary(skb))
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700703 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
704 &ipv6_hdr(skb)->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -0700705 skb->len, proto, 0));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800706
Herbert Xu759e5d02007-03-25 20:10:56 -0700707 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800708}
709
Eric Dumazet645ca702008-10-29 01:41:45 -0700710int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
Herbert Xu759e5d02007-03-25 20:10:56 -0700711 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712{
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000713 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 struct sock *sk;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900715 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 struct in6_addr *saddr, *daddr;
717 u32 ulen = 0;
718
719 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000720 goto discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700722 saddr = &ipv6_hdr(skb)->saddr;
723 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300724 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800727 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 goto short_packet;
729
Herbert Xu759e5d02007-03-25 20:10:56 -0700730 if (proto == IPPROTO_UDP) {
731 /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800733 /* Check for jumbo payload */
734 if (ulen == 0)
735 ulen = skb->len;
736
737 if (ulen < sizeof(*uh))
738 goto short_packet;
739
740 if (ulen < skb->len) {
741 if (pskb_trim_rcsum(skb, ulen))
742 goto short_packet;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700743 saddr = &ipv6_hdr(skb)->saddr;
744 daddr = &ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300745 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800746 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 }
748
Herbert Xu759e5d02007-03-25 20:10:56 -0700749 if (udp6_csum_init(skb, uh, proto))
750 goto discard;
751
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900752 /*
753 * Multicast receive code
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800755 if (ipv6_addr_is_multicast(daddr))
Pavel Emelyanove3163492008-06-16 17:12:11 -0700756 return __udp6_lib_mcast_deliver(net, skb,
757 saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
759 /* Unicast */
760
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900761 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 * check socket cache ... must talk to Alan about his plans
763 * for sock caches... i'll skip this for now.
764 */
KOVACS Krisztian607c4aa2008-10-07 12:38:32 -0700765 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
767 if (sk == NULL) {
768 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
769 goto discard;
770
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800771 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 goto discard;
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700773 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
774 proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000776 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800779 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 /* deliver */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900783
Eric Dumazetc3774112010-04-27 15:13:20 -0700784 if (sk_rcvqueues_full(sk, skb)) {
785 sock_put(sk);
786 goto discard;
787 }
Herbert Xud97106e2008-08-09 00:35:05 -0700788 bh_lock_sock(sk);
Hideo Aoki95766ff2007-12-31 00:29:24 -0800789 if (!sock_owned_by_user(sk))
790 udpv6_queue_rcv_skb(sk, skb);
Zhu Yia3a858f2010-03-04 18:01:47 +0000791 else if (sk_add_backlog(sk, skb)) {
Zhu Yi55349792010-03-04 18:01:42 +0000792 atomic_inc(&sk->sk_drops);
793 bh_unlock_sock(sk);
794 sock_put(sk);
795 goto discard;
796 }
Hideo Aoki95766ff2007-12-31 00:29:24 -0800797 bh_unlock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 sock_put(sk);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800799 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900801short_packet:
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000802 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 -0800803 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Bjørn Morkd6bc0142010-05-06 03:44:35 +0000804 saddr,
805 ntohs(uh->source),
806 ulen,
807 skb->len,
808 daddr,
809 ntohs(uh->dest));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811discard:
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700812 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 kfree_skb(skb);
Stephen Hemmingeradd459a2007-03-08 20:42:35 -0800814 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800816
Herbert Xue5bbef22007-10-15 12:50:28 -0700817static __inline__ int udpv6_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800818{
Eric Dumazet645ca702008-10-29 01:41:45 -0700819 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800820}
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822/*
823 * Throw away all pending data and cancel the corking. Socket is locked.
824 */
825static void udp_v6_flush_pending_frames(struct sock *sk)
826{
827 struct udp_sock *up = udp_sk(sk);
828
Denis V. Lunev36d926b2008-06-04 15:49:07 +0400829 if (up->pending == AF_INET)
830 udp_flush_pending_frames(sk);
831 else if (up->pending) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 up->len = 0;
833 up->pending = 0;
834 ip6_flush_pending_frames(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900835 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836}
837
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000838/**
839 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
840 * @sk: socket we are sending on
841 * @skb: sk_buff containing the filled-in UDP header
842 * (checksum field must be zeroed out)
843 */
844static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
845 const struct in6_addr *saddr,
846 const struct in6_addr *daddr, int len)
847{
848 unsigned int offset;
849 struct udphdr *uh = udp_hdr(skb);
850 __wsum csum = 0;
851
852 if (skb_queue_len(&sk->sk_write_queue) == 1) {
853 /* Only one fragment on the socket. */
854 skb->csum_start = skb_transport_header(skb) - skb->head;
855 skb->csum_offset = offsetof(struct udphdr, check);
856 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
857 } else {
858 /*
859 * HW-checksum won't work as there are two or more
860 * fragments on the socket so that all csums of sk_buffs
861 * should be together
862 */
863 offset = skb_transport_offset(skb);
864 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
865
866 skb->ip_summed = CHECKSUM_NONE;
867
868 skb_queue_walk(&sk->sk_write_queue, skb) {
869 csum = csum_add(csum, skb->csum);
870 }
871
872 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
873 csum);
874 if (uh->check == 0)
875 uh->check = CSUM_MANGLED_0;
876 }
877}
878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879/*
880 * Sending
881 */
882
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800883static int udp_v6_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884{
885 struct sk_buff *skb;
886 struct udphdr *uh;
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800887 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 struct inet_sock *inet = inet_sk(sk);
889 struct flowi *fl = &inet->cork.fl;
890 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100891 int is_udplite = IS_UDPLITE(sk);
Al Viro868c86b2006-11-14 21:35:48 -0800892 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 /* Grab the skbuff where UDP header space exists. */
895 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
896 goto out;
897
898 /*
899 * Create a UDP header
900 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300901 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 uh->source = fl->fl_ip_sport;
903 uh->dest = fl->fl_ip_dport;
904 uh->len = htons(up->len);
905 uh->check = 0;
906
Wang Chenb2bf1e22007-12-03 22:34:16 +1100907 if (is_udplite)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800908 csum = udplite_csum_outgoing(sk, skb);
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000909 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
910 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
911 up->len);
912 goto send;
913 } else
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800914 csum = udp_csum_outgoing(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800916 /* add protocol-dependent pseudo-header */
917 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
918 up->len, fl->proto, csum );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800920 uh->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Sridhar Samudrala493c6be2009-07-09 08:09:54 +0000922send:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 err = ip6_push_pending_frames(sk);
Eric Dumazet6ce9e7b2009-09-02 18:05:33 -0700924 if (err) {
925 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
926 UDP6_INC_STATS_USER(sock_net(sk),
927 UDP_MIB_SNDBUFERRORS, is_udplite);
928 err = 0;
929 }
930 } else
931 UDP6_INC_STATS_USER(sock_net(sk),
932 UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933out:
934 up->len = 0;
935 up->pending = 0;
936 return err;
937}
938
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800939int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 struct msghdr *msg, size_t len)
941{
942 struct ipv6_txoptions opt_space;
943 struct udp_sock *up = udp_sk(sk);
944 struct inet_sock *inet = inet_sk(sk);
945 struct ipv6_pinfo *np = inet6_sk(sk);
946 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000947 struct in6_addr *daddr, *final_p, final;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 struct ipv6_txoptions *opt = NULL;
949 struct ip6_flowlabel *flowlabel = NULL;
Herbert Xu132a55f2006-10-03 14:34:00 -0700950 struct flowi fl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 struct dst_entry *dst;
952 int addr_len = msg->msg_namelen;
953 int ulen = len;
954 int hlimit = -1;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900955 int tclass = -1;
Brian Haley13b52cd2010-04-23 11:26:08 +0000956 int dontfrag = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
958 int err;
Mitsuru KANDA987905d2005-09-18 00:30:08 -0700959 int connected = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100960 int is_udplite = IS_UDPLITE(sk);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800961 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
963 /* destination address check */
964 if (sin6) {
965 if (addr_len < offsetof(struct sockaddr, sa_data))
966 return -EINVAL;
967
968 switch (sin6->sin6_family) {
969 case AF_INET6:
970 if (addr_len < SIN6_LEN_RFC2133)
971 return -EINVAL;
972 daddr = &sin6->sin6_addr;
973 break;
974 case AF_INET:
975 goto do_udp_sendmsg;
976 case AF_UNSPEC:
977 msg->msg_name = sin6 = NULL;
978 msg->msg_namelen = addr_len = 0;
979 daddr = NULL;
980 break;
981 default:
982 return -EINVAL;
983 }
984 } else if (!up->pending) {
985 if (sk->sk_state != TCP_ESTABLISHED)
986 return -EDESTADDRREQ;
987 daddr = &np->daddr;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900988 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 daddr = NULL;
990
991 if (daddr) {
Brian Haleye773e4f2007-08-24 23:16:08 -0700992 if (ipv6_addr_v4mapped(daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 struct sockaddr_in sin;
994 sin.sin_family = AF_INET;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000995 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 sin.sin_addr.s_addr = daddr->s6_addr32[3];
997 msg->msg_name = &sin;
998 msg->msg_namelen = sizeof(sin);
999do_udp_sendmsg:
1000 if (__ipv6_only_sock(sk))
1001 return -ENETUNREACH;
1002 return udp_sendmsg(iocb, sk, msg, len);
1003 }
1004 }
1005
1006 if (up->pending == AF_INET)
1007 return udp_sendmsg(iocb, sk, msg, len);
1008
1009 /* Rough check on arithmetic overflow,
YOSHIFUJI Hideakib59e1392007-03-30 14:45:35 -07001010 better check is made in ip6_append_data().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 */
1012 if (len > INT_MAX - sizeof(struct udphdr))
1013 return -EMSGSIZE;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001014
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 if (up->pending) {
1016 /*
1017 * There are pending frames.
1018 * The socket lock must be held while it's corked.
1019 */
1020 lock_sock(sk);
1021 if (likely(up->pending)) {
1022 if (unlikely(up->pending != AF_INET6)) {
1023 release_sock(sk);
1024 return -EAFNOSUPPORT;
1025 }
1026 dst = NULL;
1027 goto do_append_data;
1028 }
1029 release_sock(sk);
1030 }
1031 ulen += sizeof(struct udphdr);
1032
Herbert Xu132a55f2006-10-03 14:34:00 -07001033 memset(&fl, 0, sizeof(fl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035 if (sin6) {
1036 if (sin6->sin6_port == 0)
1037 return -EINVAL;
1038
Herbert Xu132a55f2006-10-03 14:34:00 -07001039 fl.fl_ip_dport = sin6->sin6_port;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 daddr = &sin6->sin6_addr;
1041
1042 if (np->sndflow) {
Herbert Xu132a55f2006-10-03 14:34:00 -07001043 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1044 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1045 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 if (flowlabel == NULL)
1047 return -EINVAL;
1048 daddr = &flowlabel->dst;
1049 }
1050 }
1051
1052 /*
1053 * Otherwise it will be difficult to maintain
1054 * sk->sk_dst_cache.
1055 */
1056 if (sk->sk_state == TCP_ESTABLISHED &&
1057 ipv6_addr_equal(daddr, &np->daddr))
1058 daddr = &np->daddr;
1059
1060 if (addr_len >= sizeof(struct sockaddr_in6) &&
1061 sin6->sin6_scope_id &&
1062 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
Herbert Xu132a55f2006-10-03 14:34:00 -07001063 fl.oif = sin6->sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 } else {
1065 if (sk->sk_state != TCP_ESTABLISHED)
1066 return -EDESTADDRREQ;
1067
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001068 fl.fl_ip_dport = inet->inet_dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 daddr = &np->daddr;
Herbert Xu132a55f2006-10-03 14:34:00 -07001070 fl.fl6_flowlabel = np->flow_label;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001071 connected = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 }
1073
Herbert Xu132a55f2006-10-03 14:34:00 -07001074 if (!fl.oif)
1075 fl.oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
Yang Hongyang9f690db2008-12-16 02:08:29 -08001077 if (!fl.oif)
1078 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1079
Brian Haley51953d52009-10-05 08:24:16 +00001080 fl.mark = sk->sk_mark;
1081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 if (msg->msg_controllen) {
1083 opt = &opt_space;
1084 memset(opt, 0, sizeof(struct ipv6_txoptions));
1085 opt->tot_len = sizeof(*opt);
1086
Brian Haley13b52cd2010-04-23 11:26:08 +00001087 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
1088 &tclass, &dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (err < 0) {
1090 fl6_sock_release(flowlabel);
1091 return err;
1092 }
Herbert Xu132a55f2006-10-03 14:34:00 -07001093 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1094 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (flowlabel == NULL)
1096 return -EINVAL;
1097 }
1098 if (!(opt->opt_nflen|opt->opt_flen))
1099 opt = NULL;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001100 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 }
1102 if (opt == NULL)
1103 opt = np->opt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +09001104 if (flowlabel)
1105 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1106 opt = ipv6_fixup_options(&opt_space, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001108 fl.proto = sk->sk_protocol;
Brian Haley876c7f42008-04-11 00:38:24 -04001109 if (!ipv6_addr_any(daddr))
1110 ipv6_addr_copy(&fl.fl6_dst, daddr);
1111 else
1112 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
Herbert Xu132a55f2006-10-03 14:34:00 -07001113 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1114 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001115 fl.fl_ip_sport = inet->inet_sport;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001116
Arnaud Ebalard20c59de2010-06-01 21:35:01 +00001117 final_p = fl6_update_dst(&fl, opt, &final);
1118 if (final_p)
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001119 connected = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
Herbert Xu132a55f2006-10-03 14:34:00 -07001121 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1122 fl.oif = np->mcast_oif;
Mitsuru KANDA987905d2005-09-18 00:30:08 -07001123 connected = 0;
1124 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
Herbert Xu132a55f2006-10-03 14:34:00 -07001126 security_sk_classify_flow(sk, &fl);
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001127
Herbert Xu132a55f2006-10-03 14:34:00 -07001128 err = ip6_sk_dst_lookup(sk, &dst, &fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 if (err)
1130 goto out;
1131 if (final_p)
Herbert Xu132a55f2006-10-03 14:34:00 -07001132 ipv6_addr_copy(&fl.fl6_dst, final_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001134 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1135 if (err < 0) {
David S. Miller14e50e52007-05-24 18:17:54 -07001136 if (err == -EREMOTE)
1137 err = ip6_dst_blackhole(sk, &dst, &fl);
1138 if (err < 0)
1139 goto out;
1140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142 if (hlimit < 0) {
Herbert Xu132a55f2006-10-03 14:34:00 -07001143 if (ipv6_addr_is_multicast(&fl.fl6_dst))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 hlimit = np->mcast_hops;
1145 else
1146 hlimit = np->hop_limit;
1147 if (hlimit < 0)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001148 hlimit = ip6_dst_hoplimit(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 }
1150
Gerrit Renkere651f032009-08-09 08:12:48 +00001151 if (tclass < 0)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001152 tclass = np->tclass;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001153
Brian Haley13b52cd2010-04-23 11:26:08 +00001154 if (dontfrag < 0)
1155 dontfrag = np->dontfrag;
1156
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 if (msg->msg_flags&MSG_CONFIRM)
1158 goto do_confirm;
1159back_from_confirm:
1160
1161 lock_sock(sk);
1162 if (unlikely(up->pending)) {
1163 /* The socket is already corked while preparing it. */
1164 /* ... which is an evident application bug. --ANK */
1165 release_sock(sk);
1166
Patrick McHardy64ce2072005-08-09 20:50:53 -07001167 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 err = -EINVAL;
1169 goto out;
1170 }
1171
1172 up->pending = AF_INET6;
1173
1174do_append_data:
1175 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001176 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1177 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
Herbert Xu132a55f2006-10-03 14:34:00 -07001178 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001179 (struct rt6_info*)dst,
Brian Haley13b52cd2010-04-23 11:26:08 +00001180 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 if (err)
1182 udp_v6_flush_pending_frames(sk);
1183 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001184 err = udp_v6_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -07001185 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1186 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
David S. Millera5e7c212005-10-03 14:21:58 -07001188 if (dst) {
1189 if (connected) {
1190 ip6_dst_store(sk, dst,
Herbert Xu132a55f2006-10-03 14:34:00 -07001191 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001192 &np->daddr : NULL,
1193#ifdef CONFIG_IPV6_SUBTREES
Herbert Xu132a55f2006-10-03 14:34:00 -07001194 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -07001195 &np->saddr :
1196#endif
1197 NULL);
David S. Millera5e7c212005-10-03 14:21:58 -07001198 } else {
1199 dst_release(dst);
1200 }
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001201 dst = NULL;
David S. Millera5e7c212005-10-03 14:21:58 -07001202 }
1203
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 if (err > 0)
1205 err = np->recverr ? net_xmit_errno(err) : 0;
1206 release_sock(sk);
1207out:
YOSHIFUJI Hideakia3c96082008-06-04 01:30:25 +09001208 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 fl6_sock_release(flowlabel);
YOSHIFUJI Hideakicd562c92007-09-14 17:15:01 -07001210 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 return len;
David S. Millera18135e2006-08-15 00:00:09 -07001212 /*
1213 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1214 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1215 * we don't have a good statistic (IpOutDiscards but it can be too many
1216 * things). We could add another new stat but at least for now that
1217 * seems like overkill.
1218 */
1219 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Pavel Emelyanov235b9f72008-07-05 21:19:20 -07001220 UDP6_INC_STATS_USER(sock_net(sk),
1221 UDP_MIB_SNDBUFERRORS, is_udplite);
David S. Millera18135e2006-08-15 00:00:09 -07001222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 return err;
1224
1225do_confirm:
1226 dst_confirm(dst);
1227 if (!(msg->msg_flags&MSG_PROBE) || len)
1228 goto back_from_confirm;
1229 err = 0;
1230 goto out;
1231}
1232
Brian Haley7d06b2e2008-06-14 17:04:49 -07001233void udpv6_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234{
1235 lock_sock(sk);
1236 udp_v6_flush_pending_frames(sk);
1237 release_sock(sk);
1238
1239 inet6_destroy_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240}
1241
1242/*
1243 * Socket option code for UDP
1244 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001245int udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001246 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001247{
David S. Millerdb8dac22008-03-06 16:22:02 -08001248 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001249 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1250 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001251 return ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001252}
1253
1254#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001255int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001256 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001257{
David S. Millerdb8dac22008-03-06 16:22:02 -08001258 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001259 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1260 udp_v6_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001261 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001262}
1263#endif
1264
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001265int udpv6_getsockopt(struct sock *sk, int level, int optname,
1266 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001267{
David S. Millerdb8dac22008-03-06 16:22:02 -08001268 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001269 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001270 return ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001271}
1272
1273#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001274int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1275 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001276{
David S. Millerdb8dac22008-03-06 16:22:02 -08001277 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001278 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001279 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001280}
1281#endif
1282
Sridhar Samudralaba735422009-07-09 08:10:04 +00001283static int udp6_ufo_send_check(struct sk_buff *skb)
1284{
1285 struct ipv6hdr *ipv6h;
1286 struct udphdr *uh;
1287
1288 if (!pskb_may_pull(skb, sizeof(*uh)))
1289 return -EINVAL;
1290
1291 ipv6h = ipv6_hdr(skb);
1292 uh = udp_hdr(skb);
1293
1294 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1295 IPPROTO_UDP, 0);
1296 skb->csum_start = skb_transport_header(skb) - skb->head;
1297 skb->csum_offset = offsetof(struct udphdr, check);
1298 skb->ip_summed = CHECKSUM_PARTIAL;
1299 return 0;
1300}
1301
1302static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1303{
1304 struct sk_buff *segs = ERR_PTR(-EINVAL);
1305 unsigned int mss;
1306 unsigned int unfrag_ip6hlen, unfrag_len;
1307 struct frag_hdr *fptr;
1308 u8 *mac_start, *prevhdr;
1309 u8 nexthdr;
1310 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1311 int offset;
1312 __wsum csum;
1313
1314 mss = skb_shinfo(skb)->gso_size;
1315 if (unlikely(skb->len <= mss))
1316 goto out;
1317
1318 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1319 /* Packet is from an untrusted source, reset gso_segs. */
1320 int type = skb_shinfo(skb)->gso_type;
1321
1322 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1323 !(type & (SKB_GSO_UDP))))
1324 goto out;
1325
1326 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1327
1328 segs = NULL;
1329 goto out;
1330 }
1331
1332 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1333 * do checksum of UDP packets sent as multiple IP fragments.
1334 */
1335 offset = skb->csum_start - skb_headroom(skb);
1336 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1337 offset += skb->csum_offset;
1338 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1339 skb->ip_summed = CHECKSUM_NONE;
1340
1341 /* Check if there is enough headroom to insert fragment header. */
1342 if ((skb_headroom(skb) < frag_hdr_sz) &&
1343 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1344 goto out;
1345
1346 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1347 * bytes to insert fragment header.
1348 */
1349 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1350 nexthdr = *prevhdr;
1351 *prevhdr = NEXTHDR_FRAGMENT;
1352 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1353 unfrag_ip6hlen;
1354 mac_start = skb_mac_header(skb);
1355 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1356
1357 skb->mac_header -= frag_hdr_sz;
1358 skb->network_header -= frag_hdr_sz;
1359
1360 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1361 fptr->nexthdr = nexthdr;
1362 fptr->reserved = 0;
1363 ipv6_select_ident(fptr);
1364
1365 /* Fragment the skb. ipv6 header and the remaining fields of the
1366 * fragment header are updated in ipv6_gso_segment()
1367 */
1368 segs = skb_segment(skb, features);
1369
1370out:
1371 return segs;
1372}
1373
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001374static const struct inet6_protocol udpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 .handler = udpv6_rcv,
1376 .err_handler = udpv6_err,
Sridhar Samudralaba735422009-07-09 08:10:04 +00001377 .gso_send_check = udp6_ufo_send_check,
1378 .gso_segment = udp6_ufo_fragment,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1380};
1381
1382/* ------------------------------------------------------------------------ */
1383#ifdef CONFIG_PROC_FS
1384
1385static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1386{
1387 struct inet_sock *inet = inet_sk(sp);
1388 struct ipv6_pinfo *np = inet6_sk(sp);
1389 struct in6_addr *dest, *src;
1390 __u16 destp, srcp;
1391
1392 dest = &np->daddr;
1393 src = &np->rcv_saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001394 destp = ntohs(inet->inet_dport);
1395 srcp = ntohs(inet->inet_sport);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 seq_printf(seq,
Eric Dumazetf86dcc52009-10-07 00:37:59 +00001397 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001398 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 bucket,
1400 src->s6_addr32[0], src->s6_addr32[1],
1401 src->s6_addr32[2], src->s6_addr32[3], srcp,
1402 dest->s6_addr32[0], dest->s6_addr32[1],
1403 dest->s6_addr32[2], dest->s6_addr32[3], destp,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001404 sp->sk_state,
Eric Dumazet31e6d362009-06-17 19:05:41 -07001405 sk_wmem_alloc_get(sp),
1406 sk_rmem_alloc_get(sp),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 0, 0L, 0,
1408 sock_i_uid(sp), 0,
1409 sock_i_ino(sp),
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001410 atomic_read(&sp->sk_refcnt), sp,
1411 atomic_read(&sp->sk_drops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412}
1413
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001414int udp6_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415{
1416 if (v == SEQ_START_TOKEN)
1417 seq_printf(seq,
1418 " sl "
1419 "local_address "
1420 "remote_address "
1421 "st tx_queue rx_queue tr tm->when retrnsmt"
Eric Dumazetcb61cb92008-06-17 21:04:56 -07001422 " uid timeout inode ref pointer drops\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 else
1424 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1425 return 0;
1426}
1427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428static struct udp_seq_afinfo udp6_seq_afinfo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 .name = "udp6",
1430 .family = AF_INET6,
Eric Dumazet645ca702008-10-29 01:41:45 -07001431 .udp_table = &udp_table,
Denis V. Lunev4ad96d32008-03-28 18:25:53 -07001432 .seq_fops = {
1433 .owner = THIS_MODULE,
1434 },
Denis V. Lunevdda61922008-03-28 18:24:26 -07001435 .seq_ops = {
1436 .show = udp6_seq_show,
1437 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438};
1439
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001440int __net_init udp6_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441{
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001442 return udp_proc_register(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443}
1444
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -07001445void udp6_proc_exit(struct net *net) {
1446 udp_proc_unregister(net, &udp6_seq_afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447}
1448#endif /* CONFIG_PROC_FS */
1449
1450/* ------------------------------------------------------------------------ */
1451
1452struct proto udpv6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001453 .name = "UDPv6",
1454 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001455 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001456 .connect = ip6_datagram_connect,
1457 .disconnect = udp_disconnect,
1458 .ioctl = udp_ioctl,
1459 .destroy = udpv6_destroy_sock,
1460 .setsockopt = udpv6_setsockopt,
1461 .getsockopt = udpv6_getsockopt,
1462 .sendmsg = udpv6_sendmsg,
1463 .recvmsg = udpv6_recvmsg,
1464 .backlog_rcv = udpv6_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001465 .hash = udp_lib_hash,
1466 .unhash = udp_lib_unhash,
Eric Dumazet719f8352010-09-08 05:08:44 +00001467 .rehash = udp_v6_rehash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001468 .get_port = udp_v6_get_port,
Hideo Aoki95766ff2007-12-31 00:29:24 -08001469 .memory_allocated = &udp_memory_allocated,
1470 .sysctl_mem = sysctl_udp_mem,
1471 .sysctl_wmem = &sysctl_udp_wmem_min,
1472 .sysctl_rmem = &sysctl_udp_rmem_min,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001473 .obj_size = sizeof(struct udp6_sock),
Eric Dumazet271b72c2008-10-29 02:11:14 -07001474 .slab_flags = SLAB_DESTROY_BY_RCU,
Eric Dumazet645ca702008-10-29 01:41:45 -07001475 .h.udp_table = &udp_table,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001476#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001477 .compat_setsockopt = compat_udpv6_setsockopt,
1478 .compat_getsockopt = compat_udpv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001479#endif
Octavian Purdilafcbdf092010-12-16 14:26:56 -08001480 .clear_sk = sk_prot_clear_portaddr_nulls,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481};
1482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483static struct inet_protosw udpv6_protosw = {
1484 .type = SOCK_DGRAM,
1485 .protocol = IPPROTO_UDP,
1486 .prot = &udpv6_prot,
1487 .ops = &inet6_dgram_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 .no_check = UDP_CSUM_DEFAULT,
1489 .flags = INET_PROTOSW_PERMANENT,
1490};
1491
1492
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001493int __init udpv6_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494{
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001495 int ret;
1496
1497 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1498 if (ret)
1499 goto out;
1500
1501 ret = inet6_register_protosw(&udpv6_protosw);
1502 if (ret)
1503 goto out_udpv6_protocol;
1504out:
1505 return ret;
1506
1507out_udpv6_protocol:
1508 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1509 goto out;
1510}
1511
Daniel Lezcano09f77092007-12-13 05:34:58 -08001512void udpv6_exit(void)
Daniel Lezcano7f4e4862007-12-11 02:25:35 -08001513{
1514 inet6_unregister_protosw(&udpv6_protosw);
1515 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516}