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bnx2x: version 1.52.1-4
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / udp.c
CommitLineData
1da177e4
LT		 1/*
2 * UDP over IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 *
8 * Based on linux/ipv4/udp.c
9 *
1da177e4
LT		 10 * 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
1da177e4
LT		 24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
1da177e4
LT		 28#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>
1781f7f5 35#include <linux/module.h>
3305b80c 36#include <linux/skbuff.h>
1da177e4
LT		 37#include <asm/uaccess.h>
38
1da177e4
LT		 39#include <net/ndisc.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/ip6_route.h>
1da177e4 43#include <net/raw.h>
c752f073 44#include <net/tcp_states.h>
1da177e4
LT		 45#include <net/ip6_checksum.h>
46#include <net/xfrm.h>
47
48#include <linux/proc_fs.h>
49#include <linux/seq_file.h>
ba4e58ec 50#include "udp_impl.h"
1da177e4 51
b2f5e7cd
VY		 52int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
53{
54 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
55 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
c720c7e8 56 __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr;
499923c7 57 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
b2f5e7cd
VY		 58 int sk_ipv6only = ipv6_only_sock(sk);
59 int sk2_ipv6only = inet_v6_ipv6only(sk2);
60 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
61 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
62
63 /* if both are mapped, treat as IPv4 */
64 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
499923c7 65 return (!sk2_ipv6only &&
c720c7e8
ED		 66 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
67 sk1_rcv_saddr == sk2_rcv_saddr));
b2f5e7cd
VY		 68
69 if (addr_type2 == IPV6_ADDR_ANY &&
70 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
71 return 1;
72
73 if (addr_type == IPV6_ADDR_ANY &&
74 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
75 return 1;
76
77 if (sk2_rcv_saddr6 &&
78 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
79 return 1;
80
81 return 0;
82}
83
d4cada4a
ED		 84static unsigned int udp6_portaddr_hash(struct net *net,
85 const struct in6_addr *addr6,
86 unsigned int port)
87{
88 unsigned int hash, mix = net_hash_mix(net);
89
90 if (ipv6_addr_any(addr6))
91 hash = jhash_1word(0, mix);
92 else if (ipv6_addr_type(addr6) == IPV6_ADDR_MAPPED)
93 hash = jhash_1word(addr6->s6_addr32[3], mix);
94 else
95 hash = jhash2(addr6->s6_addr32, 4, mix);
96
97 return hash ^ port;
98}
99
100
6ba5a3c5 101int udp_v6_get_port(struct sock *sk, unsigned short snum)
1da177e4 102{
d4cada4a
ED		 103 /* precompute partial secondary hash */
104 udp_sk(sk)->udp_portaddr_hash =
105 udp6_portaddr_hash(sock_net(sk),
106 &inet6_sk(sk)->rcv_saddr,
107 0);
6ba5a3c5 108 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
1da177e4
LT		 109}
110
645ca708
ED		 111static inline int compute_score(struct sock *sk, struct net *net,
112 unsigned short hnum,
113 struct in6_addr *saddr, __be16 sport,
114 struct in6_addr *daddr, __be16 dport,
115 int dif)
116{
117 int score = -1;
118
d4cada4a 119 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
645ca708
ED		 120 sk->sk_family == PF_INET6) {
121 struct ipv6_pinfo *np = inet6_sk(sk);
122 struct inet_sock *inet = inet_sk(sk);
123
124 score = 0;
c720c7e8
ED		 125 if (inet->inet_dport) {
126 if (inet->inet_dport != sport)
645ca708
ED		 127 return -1;
128 score++;
129 }
130 if (!ipv6_addr_any(&np->rcv_saddr)) {
131 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
132 return -1;
133 score++;
134 }
135 if (!ipv6_addr_any(&np->daddr)) {
136 if (!ipv6_addr_equal(&np->daddr, saddr))
137 return -1;
138 score++;
139 }
140 if (sk->sk_bound_dev_if) {
141 if (sk->sk_bound_dev_if != dif)
142 return -1;
143 score++;
144 }
145 }
146 return score;
147}
148
fddc17de
ED		 149#define SCORE2_MAX (1 + 1 + 1)
150static inline int compute_score2(struct sock *sk, struct net *net,
151 const struct in6_addr *saddr, __be16 sport,
152 const struct in6_addr *daddr, unsigned short hnum,
153 int dif)
154{
155 int score = -1;
156
157 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
158 sk->sk_family == PF_INET6) {
159 struct ipv6_pinfo *np = inet6_sk(sk);
160 struct inet_sock *inet = inet_sk(sk);
161
162 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
163 return -1;
164 score = 0;
165 if (inet->inet_dport) {
166 if (inet->inet_dport != sport)
167 return -1;
168 score++;
169 }
170 if (!ipv6_addr_any(&np->daddr)) {
171 if (!ipv6_addr_equal(&np->daddr, saddr))
172 return -1;
173 score++;
174 }
175 if (sk->sk_bound_dev_if) {
176 if (sk->sk_bound_dev_if != dif)
177 return -1;
178 score++;
179 }
180 }
181 return score;
182}
183
184#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
185 hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
186
187/* called with read_rcu_lock() */
188static struct sock *udp6_lib_lookup2(struct net *net,
189 const struct in6_addr *saddr, __be16 sport,
190 const struct in6_addr *daddr, unsigned int hnum, int dif,
191 struct udp_hslot *hslot2, unsigned int slot2)
192{
193 struct sock *sk, *result;
194 struct hlist_nulls_node *node;
195 int score, badness;
196
197begin:
198 result = NULL;
199 badness = -1;
200 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
201 score = compute_score2(sk, net, saddr, sport,
202 daddr, hnum, dif);
203 if (score > badness) {
204 result = sk;
205 badness = score;
206 if (score == SCORE2_MAX)
207 goto exact_match;
208 }
209 }
210 /*
211 * if the nulls value we got at the end of this lookup is
212 * not the expected one, we must restart lookup.
213 * We probably met an item that was moved to another chain.
214 */
215 if (get_nulls_value(node) != slot2)
216 goto begin;
217
218 if (result) {
219exact_match:
220 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
221 result = NULL;
222 else if (unlikely(compute_score2(result, net, saddr, sport,
223 daddr, hnum, dif) < badness)) {
224 sock_put(result);
225 goto begin;
226 }
227 }
228 return result;
229}
230
fa4d3c62
PE		 231static struct sock *__udp6_lib_lookup(struct net *net,
232 struct in6_addr *saddr, __be16 sport,
ba4e58ec 233 struct in6_addr *daddr, __be16 dport,
645ca708 234 int dif, struct udp_table *udptable)
1da177e4 235{
271b72c7 236 struct sock *sk, *result;
88ab1932 237 struct hlist_nulls_node *node;
1da177e4 238 unsigned short hnum = ntohs(dport);
fddc17de
ED		 239 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
240 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
271b72c7 241 int score, badness;
645ca708 242
271b72c7 243 rcu_read_lock();
fddc17de
ED		 244 if (hslot->count > 10) {
245 hash2 = udp6_portaddr_hash(net, daddr, hnum);
246 slot2 = hash2 & udptable->mask;
247 hslot2 = &udptable->hash2[slot2];
248 if (hslot->count < hslot2->count)
249 goto begin;
250
251 result = udp6_lib_lookup2(net, saddr, sport,
252 daddr, hnum, dif,
253 hslot2, slot2);
254 if (!result) {
255 hash2 = udp6_portaddr_hash(net, &in6addr_any, 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, &in6addr_any, sport,
262 daddr, hnum, dif,
263 hslot2, slot2);
264 }
265 rcu_read_unlock();
266 return result;
267 }
271b72c7
ED		 268begin:
269 result = NULL;
270 badness = -1;
88ab1932 271 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
645ca708
ED		 272 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
273 if (score > badness) {
274 result = sk;
275 badness = score;
1da177e4
LT		 276 }
277 }
88ab1932
ED		 278 /*
279 * if the nulls value we got at the end of this lookup is
280 * not the expected one, we must restart lookup.
281 * We probably met an item that was moved to another chain.
282 */
fddc17de 283 if (get_nulls_value(node) != slot)
88ab1932
ED		 284 goto begin;
285
271b72c7
ED		 286 if (result) {
287 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
288 result = NULL;
289 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
290 daddr, dport, dif) < badness)) {
291 sock_put(result);
292 goto begin;
293 }
294 }
295 rcu_read_unlock();
1da177e4
LT		 296 return result;
297}
298
607c4aaf
KK		 299static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
300 __be16 sport, __be16 dport,
645ca708 301 struct udp_table *udptable)
607c4aaf 302{
23542618 303 struct sock *sk;
607c4aaf
KK		 304 struct ipv6hdr *iph = ipv6_hdr(skb);
305
23542618
KK		 306 if (unlikely(sk = skb_steal_sock(skb)))
307 return sk;
adf30907
ED		 308 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
309 &iph->daddr, dport, inet6_iif(skb),
310 udptable);
607c4aaf
KK		 311}
312
1da177e4
LT		 313/*
314 * This should be easy, if there is something there we
315 * return it, otherwise we block.
316 */
317
ba4e58ec 318int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 319 struct msghdr *msg, size_t len,
320 int noblock, int flags, int *addr_len)
321{
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct inet_sock *inet = inet_sk(sk);
1ab1457c 324 struct sk_buff *skb;
759e5d00 325 unsigned int ulen, copied;
a59322be 326 int peeked;
759e5d00
HX		 327 int err;
328 int is_udplite = IS_UDPLITE(sk);
f26ba175 329 int is_udp4;
1da177e4 330
1ab1457c
YH		 331 if (addr_len)
332 *addr_len=sizeof(struct sockaddr_in6);
333
1da177e4
LT		 334 if (flags & MSG_ERRQUEUE)
335 return ipv6_recv_error(sk, msg, len);
336
337try_again:
a59322be
HX		 338 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
339 &peeked, &err);
1da177e4
LT		 340 if (!skb)
341 goto out;
342
759e5d00
HX		 343 ulen = skb->len - sizeof(struct udphdr);
344 copied = len;
345 if (copied > ulen)
346 copied = ulen;
347 else if (copied < ulen)
1ab1457c 348 msg->msg_flags |= MSG_TRUNC;
1da177e4 349
f26ba175
WY		 350 is_udp4 = (skb->protocol == htons(ETH_P_IP));
351
ba4e58ec 352 /*
759e5d00
HX		 353 * If checksum is needed at all, try to do it while copying the
354 * data. If the data is truncated, or if we only want a partial
355 * coverage checksum (UDP-Lite), do it before the copy.
ba4e58ec 356 */
ba4e58ec 357
759e5d00
HX		 358 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
359 if (udp_lib_checksum_complete(skb))
1da177e4 360 goto csum_copy_err;
ba4e58ec
GR		 361 }
362
60476372 363 if (skb_csum_unnecessary(skb))
ba4e58ec
GR		 364 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
365 msg->msg_iov, copied );
366 else {
1da177e4
LT		 367 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
368 if (err == -EINVAL)
369 goto csum_copy_err;
370 }
371 if (err)
372 goto out_free;
373
f26ba175
WY		 374 if (!peeked) {
375 if (is_udp4)
376 UDP_INC_STATS_USER(sock_net(sk),
377 UDP_MIB_INDATAGRAMS, is_udplite);
378 else
379 UDP6_INC_STATS_USER(sock_net(sk),
380 UDP_MIB_INDATAGRAMS, is_udplite);
381 }
cb75994e 382
3b885787 383 sock_recv_ts_and_drops(msg, sk, skb);
1da177e4
LT		 384
385 /* Copy the address. */
386 if (msg->msg_name) {
387 struct sockaddr_in6 *sin6;
1ab1457c 388
1da177e4
LT		 389 sin6 = (struct sockaddr_in6 *) msg->msg_name;
390 sin6->sin6_family = AF_INET6;
4bedb452 391 sin6->sin6_port = udp_hdr(skb)->source;
1da177e4
LT		 392 sin6->sin6_flowinfo = 0;
393 sin6->sin6_scope_id = 0;
394
f26ba175 395 if (is_udp4)
b301e82c
BH		 396 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
397 &sin6->sin6_addr);
1da177e4 398 else {
0660e03f
ACM		 399 ipv6_addr_copy(&sin6->sin6_addr,
400 &ipv6_hdr(skb)->saddr);
1da177e4
LT		 401 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
402 sin6->sin6_scope_id = IP6CB(skb)->iif;
403 }
404
405 }
f26ba175 406 if (is_udp4) {
1da177e4
LT		 407 if (inet->cmsg_flags)
408 ip_cmsg_recv(msg, skb);
409 } else {
410 if (np->rxopt.all)
411 datagram_recv_ctl(sk, msg, skb);
1ab1457c 412 }
1da177e4
LT		 413
414 err = copied;
415 if (flags & MSG_TRUNC)
759e5d00 416 err = ulen;
1da177e4
LT		 417
418out_free:
9d410c79 419 skb_free_datagram_locked(sk, skb);
1da177e4
LT		 420out:
421 return err;
422
423csum_copy_err:
95766fff 424 lock_sock(sk);
0856f939
WY		 425 if (!skb_kill_datagram(sk, skb, flags)) {
426 if (is_udp4)
427 UDP_INC_STATS_USER(sock_net(sk),
428 UDP_MIB_INERRORS, is_udplite);
429 else
430 UDP6_INC_STATS_USER(sock_net(sk),
431 UDP_MIB_INERRORS, is_udplite);
432 }
95766fff 433 release_sock(sk);
1da177e4 434
7a0ff716 435 if (flags & MSG_DONTWAIT)
1da177e4 436 return -EAGAIN;
1da177e4
LT		 437 goto try_again;
438}
439
ba4e58ec 440void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
d5fdd6ba 441 u8 type, u8 code, int offset, __be32 info,
645ca708 442 struct udp_table *udptable)
1da177e4
LT		 443{
444 struct ipv6_pinfo *np;
445 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
1da177e4
LT		 446 struct in6_addr *saddr = &hdr->saddr;
447 struct in6_addr *daddr = &hdr->daddr;
448 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
449 struct sock *sk;
450 int err;
451
c346dca1 452 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
ba4e58ec 453 saddr, uh->source, inet6_iif(skb), udptable);
1da177e4
LT		 454 if (sk == NULL)
455 return;
456
457 np = inet6_sk(sk);
458
459 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
460 goto out;
461
462 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
463 goto out;
464
465 if (np->recverr)
466 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
467
468 sk->sk_err = err;
469 sk->sk_error_report(sk);
470out:
471 sock_put(sk);
472}
473
ba4e58ec 474static __inline__ void udpv6_err(struct sk_buff *skb,
d5fdd6ba
BH		 475 struct inet6_skb_parm *opt, u8 type,
476 u8 code, int offset, __be32 info )
ba4e58ec 477{
645ca708 478 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
ba4e58ec
GR		 479}
480
481int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
1da177e4 482{
ba4e58ec 483 struct udp_sock *up = udp_sk(sk);
a18135eb 484 int rc;
b2bf1e26 485 int is_udplite = IS_UDPLITE(sk);
a18135eb 486
ba4e58ec
GR		 487 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
488 goto drop;
1da177e4 489
ba4e58ec
GR		 490 /*
491 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
492 */
b2bf1e26 493 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
ba4e58ec
GR		 494
495 if (up->pcrlen == 0) { /* full coverage was set */
496 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
497 " %d while full coverage %d requested\n",
498 UDP_SKB_CB(skb)->cscov, skb->len);
499 goto drop;
500 }
501 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
502 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
503 "too small, need min %d\n",
504 UDP_SKB_CB(skb)->cscov, up->pcrlen);
505 goto drop;
506 }
1da177e4
LT		 507 }
508
1ab6eb62
HX		 509 if (sk->sk_filter) {
510 if (udp_lib_checksum_complete(skb))
511 goto drop;
512 }
ba4e58ec 513
766e9037 514 if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
a18135eb 515 /* Note that an ENOMEM error is charged twice */
766e9037 516 if (rc == -ENOMEM)
ef28d1a2
PE		 517 UDP6_INC_STATS_BH(sock_net(sk),
518 UDP_MIB_RCVBUFERRORS, is_udplite);
8edf19c2 519 goto drop_no_sk_drops_inc;
1da177e4 520 }
cb75994e 521
1da177e4 522 return 0;
ba4e58ec 523drop:
8edf19c2
ED		 524 atomic_inc(&sk->sk_drops);
525drop_no_sk_drops_inc:
ef28d1a2 526 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
ba4e58ec
GR		 527 kfree_skb(skb);
528 return -1;
1da177e4
LT		 529}
530
920a4611 531static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
e69a4adc
AV		 532 __be16 loc_port, struct in6_addr *loc_addr,
533 __be16 rmt_port, struct in6_addr *rmt_addr,
1da177e4
LT		 534 int dif)
535{
88ab1932 536 struct hlist_nulls_node *node;
1da177e4
LT		 537 struct sock *s = sk;
538 unsigned short num = ntohs(loc_port);
539
88ab1932 540 sk_nulls_for_each_from(s, node) {
1da177e4
LT		 541 struct inet_sock *inet = inet_sk(s);
542
920a4611 543 if (!net_eq(sock_net(s), net))
b8ad0cbc
DL		 544 continue;
545
d4cada4a
ED		 546 if (udp_sk(s)->udp_port_hash == num &&
547 s->sk_family == PF_INET6) {
1da177e4 548 struct ipv6_pinfo *np = inet6_sk(s);
c720c7e8
ED		 549 if (inet->inet_dport) {
550 if (inet->inet_dport != rmt_port)
1da177e4
LT		 551 continue;
552 }
553 if (!ipv6_addr_any(&np->daddr) &&
554 !ipv6_addr_equal(&np->daddr, rmt_addr))
555 continue;
556
557 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
558 continue;
559
560 if (!ipv6_addr_any(&np->rcv_saddr)) {
40796c5e
DS		 561 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
562 continue;
1da177e4 563 }
add459aa 564 if (!inet6_mc_check(s, loc_addr, rmt_addr))
1da177e4
LT		 565 continue;
566 return s;
567 }
568 }
569 return NULL;
570}
571
a1ab77f9
ED		 572static void flush_stack(struct sock **stack, unsigned int count,
573 struct sk_buff *skb, unsigned int final)
574{
575 unsigned int i;
576 struct sock *sk;
577 struct sk_buff *skb1;
578
579 for (i = 0; i < count; i++) {
580 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
581
f6b8f32c 582 sk = stack[i];
a1ab77f9 583 if (skb1) {
a1ab77f9
ED		 584 bh_lock_sock(sk);
585 if (!sock_owned_by_user(sk))
586 udpv6_queue_rcv_skb(sk, skb1);
587 else
588 sk_add_backlog(sk, skb1);
589 bh_unlock_sock(sk);
f6b8f32c
ED		 590 } else {
591 atomic_inc(&sk->sk_drops);
592 UDP6_INC_STATS_BH(sock_net(sk),
593 UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
594 UDP6_INC_STATS_BH(sock_net(sk),
595 UDP_MIB_INERRORS, IS_UDPLITE(sk));
a1ab77f9
ED		 596 }
597 }
598}
1da177e4
LT		 599/*
600 * Note: called only from the BH handler context,
601 * so we don't need to lock the hashes.
602 */
e3163493
PE		 603static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
604 struct in6_addr *saddr, struct in6_addr *daddr,
645ca708 605 struct udp_table *udptable)
1da177e4 606{
a1ab77f9 607 struct sock *sk, *stack[256 / sizeof(struct sock *)];
4bedb452 608 const struct udphdr *uh = udp_hdr(skb);
f86dcc5a 609 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
1da177e4 610 int dif;
a1ab77f9 611 unsigned int i, count = 0;
1da177e4 612
645ca708 613 spin_lock(&hslot->lock);
88ab1932 614 sk = sk_nulls_head(&hslot->head);
f2776ff0 615 dif = inet6_iif(skb);
920a4611 616 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
a1ab77f9
ED		 617 while (sk) {
618 stack[count++] = sk;
619 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
620 uh->source, saddr, dif);
621 if (unlikely(count == ARRAY_SIZE(stack))) {
622 if (!sk)
623 break;
624 flush_stack(stack, count, skb, ~0);
625 count = 0;
95766fff 626 }
1da177e4 627 }
a1ab77f9
ED		 628 /*
629 * before releasing the lock, we must take reference on sockets
630 */
631 for (i = 0; i < count; i++)
632 sock_hold(stack[i]);
633
645ca708 634 spin_unlock(&hslot->lock);
a1ab77f9
ED		 635
636 if (count) {
637 flush_stack(stack, count, skb, count - 1);
638
639 for (i = 0; i < count; i++)
640 sock_put(stack[i]);
641 } else {
642 kfree_skb(skb);
643 }
ba4e58ec 644 return 0;
1da177e4
LT		 645}
646
759e5d00
HX		 647static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
648 int proto)
ba4e58ec 649{
759e5d00
HX		 650 int err;
651
652 UDP_SKB_CB(skb)->partial_cov = 0;
653 UDP_SKB_CB(skb)->cscov = skb->len;
654
db8dac20 655 if (proto == IPPROTO_UDPLITE) {
759e5d00
HX		 656 err = udplite_checksum_init(skb, uh);
657 if (err)
658 return err;
659 }
660
ba4e58ec
GR		 661 if (uh->check == 0) {
662 /* RFC 2460 section 8.1 says that we SHOULD log
663 this error. Well, it is reasonable.
664 */
665 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
666 return 1;
667 }
668 if (skb->ip_summed == CHECKSUM_COMPLETE &&
0660e03f 669 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
759e5d00 670 skb->len, proto, skb->csum))
ba4e58ec
GR		 671 skb->ip_summed = CHECKSUM_UNNECESSARY;
672
60476372 673 if (!skb_csum_unnecessary(skb))
0660e03f
ACM		 674 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
675 &ipv6_hdr(skb)->daddr,
759e5d00 676 skb->len, proto, 0));
ba4e58ec 677
759e5d00 678 return 0;
ba4e58ec
GR		 679}
680
645ca708 681int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
759e5d00 682 int proto)
1da177e4 683{
1da177e4 684 struct sock *sk;
1ab1457c 685 struct udphdr *uh;
1da177e4
LT		 686 struct net_device *dev = skb->dev;
687 struct in6_addr *saddr, *daddr;
688 u32 ulen = 0;
ef28d1a2 689 struct net *net = dev_net(skb->dev);
1da177e4
LT		 690
691 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
692 goto short_packet;
693
0660e03f
ACM		 694 saddr = &ipv6_hdr(skb)->saddr;
695 daddr = &ipv6_hdr(skb)->daddr;
4bedb452 696 uh = udp_hdr(skb);
1da177e4
LT		 697
698 ulen = ntohs(uh->len);
ba4e58ec
GR		 699 if (ulen > skb->len)
700 goto short_packet;
1da177e4 701
759e5d00
HX		 702 if (proto == IPPROTO_UDP) {
703 /* UDP validates ulen. */
1da177e4 704
ba4e58ec
GR		 705 /* Check for jumbo payload */
706 if (ulen == 0)
707 ulen = skb->len;
1da177e4 708
ba4e58ec
GR		 709 if (ulen < sizeof(*uh))
710 goto short_packet;
1da177e4 711
ba4e58ec
GR		 712 if (ulen < skb->len) {
713 if (pskb_trim_rcsum(skb, ulen))
714 goto short_packet;
0660e03f
ACM		 715 saddr = &ipv6_hdr(skb)->saddr;
716 daddr = &ipv6_hdr(skb)->daddr;
4bedb452 717 uh = udp_hdr(skb);
ba4e58ec 718 }
ba4e58ec 719 }
1da177e4 720
759e5d00
HX		 721 if (udp6_csum_init(skb, uh, proto))
722 goto discard;
723
1ab1457c
YH		 724 /*
725 * Multicast receive code
1da177e4 726 */
ba4e58ec 727 if (ipv6_addr_is_multicast(daddr))
e3163493
PE		 728 return __udp6_lib_mcast_deliver(net, skb,
729 saddr, daddr, udptable);
1da177e4
LT		 730
731 /* Unicast */
732
1ab1457c 733 /*
1da177e4
LT		 734 * check socket cache ... must talk to Alan about his plans
735 * for sock caches... i'll skip this for now.
736 */
607c4aaf 737 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1da177e4
LT		 738
739 if (sk == NULL) {
740 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
741 goto discard;
742
ba4e58ec 743 if (udp_lib_checksum_complete(skb))
1da177e4 744 goto discard;
ef28d1a2
PE		 745 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
746 proto == IPPROTO_UDPLITE);
1da177e4
LT		 747
748 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
749
750 kfree_skb(skb);
add459aa 751 return 0;
1da177e4 752 }
1ab1457c 753
1da177e4 754 /* deliver */
1ab1457c 755
d97106ea 756 bh_lock_sock(sk);
95766fff
HA		 757 if (!sock_owned_by_user(sk))
758 udpv6_queue_rcv_skb(sk, skb);
759 else
760 sk_add_backlog(sk, skb);
761 bh_unlock_sock(sk);
1da177e4 762 sock_put(sk);
add459aa 763 return 0;
1da177e4 764
1ab1457c 765short_packet:
ba4e58ec 766 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
db8dac20 767 proto == IPPROTO_UDPLITE ? "-Lite" : "",
759e5d00 768 ulen, skb->len);
1da177e4
LT		 769
770discard:
ef28d1a2 771 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1da177e4 772 kfree_skb(skb);
add459aa 773 return 0;
1da177e4 774}
ba4e58ec 775
e5bbef20 776static __inline__ int udpv6_rcv(struct sk_buff *skb)
ba4e58ec 777{
645ca708 778 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
ba4e58ec
GR		 779}
780
1da177e4
LT		 781/*
782 * Throw away all pending data and cancel the corking. Socket is locked.
783 */
784static void udp_v6_flush_pending_frames(struct sock *sk)
785{
786 struct udp_sock *up = udp_sk(sk);
787
36d926b9
DL		 788 if (up->pending == AF_INET)
789 udp_flush_pending_frames(sk);
790 else if (up->pending) {
1da177e4
LT		 791 up->len = 0;
792 up->pending = 0;
793 ip6_flush_pending_frames(sk);
1ab1457c 794 }
1da177e4
LT		 795}
796
493c6be3
SS		 797/**
798 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
799 * @sk: socket we are sending on
800 * @skb: sk_buff containing the filled-in UDP header
801 * (checksum field must be zeroed out)
802 */
803static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
804 const struct in6_addr *saddr,
805 const struct in6_addr *daddr, int len)
806{
807 unsigned int offset;
808 struct udphdr *uh = udp_hdr(skb);
809 __wsum csum = 0;
810
811 if (skb_queue_len(&sk->sk_write_queue) == 1) {
812 /* Only one fragment on the socket. */
813 skb->csum_start = skb_transport_header(skb) - skb->head;
814 skb->csum_offset = offsetof(struct udphdr, check);
815 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
816 } else {
817 /*
818 * HW-checksum won't work as there are two or more
819 * fragments on the socket so that all csums of sk_buffs
820 * should be together
821 */
822 offset = skb_transport_offset(skb);
823 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
824
825 skb->ip_summed = CHECKSUM_NONE;
826
827 skb_queue_walk(&sk->sk_write_queue, skb) {
828 csum = csum_add(csum, skb->csum);
829 }
830
831 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
832 csum);
833 if (uh->check == 0)
834 uh->check = CSUM_MANGLED_0;
835 }
836}
837
1da177e4
LT		 838/*
839 * Sending
840 */
841
4c0a6cb0 842static int udp_v6_push_pending_frames(struct sock *sk)
1da177e4
LT		 843{
844 struct sk_buff *skb;
845 struct udphdr *uh;
4c0a6cb0 846 struct udp_sock *up = udp_sk(sk);
1da177e4
LT		 847 struct inet_sock *inet = inet_sk(sk);
848 struct flowi *fl = &inet->cork.fl;
849 int err = 0;
b2bf1e26 850 int is_udplite = IS_UDPLITE(sk);
868c86bc 851 __wsum csum = 0;
1da177e4
LT		 852
853 /* Grab the skbuff where UDP header space exists. */
854 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
855 goto out;
856
857 /*
858 * Create a UDP header
859 */
4bedb452 860 uh = udp_hdr(skb);
1da177e4
LT		 861 uh->source = fl->fl_ip_sport;
862 uh->dest = fl->fl_ip_dport;
863 uh->len = htons(up->len);
864 uh->check = 0;
865
b2bf1e26 866 if (is_udplite)
ba4e58ec 867 csum = udplite_csum_outgoing(sk, skb);
493c6be3
SS		 868 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
869 udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
870 up->len);
871 goto send;
872 } else
ba4e58ec 873 csum = udp_csum_outgoing(sk, skb);
1da177e4 874
ba4e58ec
GR		 875 /* add protocol-dependent pseudo-header */
876 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
877 up->len, fl->proto, csum );
1da177e4 878 if (uh->check == 0)
f6ab0288 879 uh->check = CSUM_MANGLED_0;
1da177e4 880
493c6be3 881send:
1da177e4 882 err = ip6_push_pending_frames(sk);
6ce9e7b5
ED		 883 if (err) {
884 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
885 UDP6_INC_STATS_USER(sock_net(sk),
886 UDP_MIB_SNDBUFERRORS, is_udplite);
887 err = 0;
888 }
889 } else
890 UDP6_INC_STATS_USER(sock_net(sk),
891 UDP_MIB_OUTDATAGRAMS, is_udplite);
1da177e4
LT		 892out:
893 up->len = 0;
894 up->pending = 0;
895 return err;
896}
897
ba4e58ec 898int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 899 struct msghdr *msg, size_t len)
900{
901 struct ipv6_txoptions opt_space;
902 struct udp_sock *up = udp_sk(sk);
903 struct inet_sock *inet = inet_sk(sk);
904 struct ipv6_pinfo *np = inet6_sk(sk);
905 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
906 struct in6_addr *daddr, *final_p = NULL, final;
907 struct ipv6_txoptions *opt = NULL;
908 struct ip6_flowlabel *flowlabel = NULL;
132a55f3 909 struct flowi fl;
1da177e4
LT		 910 struct dst_entry *dst;
911 int addr_len = msg->msg_namelen;
912 int ulen = len;
913 int hlimit = -1;
41a1f8ea 914 int tclass = -1;
1da177e4
LT		 915 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
916 int err;
987905de 917 int connected = 0;
b2bf1e26 918 int is_udplite = IS_UDPLITE(sk);
ba4e58ec 919 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1da177e4
LT		 920
921 /* destination address check */
922 if (sin6) {
923 if (addr_len < offsetof(struct sockaddr, sa_data))
924 return -EINVAL;
925
926 switch (sin6->sin6_family) {
927 case AF_INET6:
928 if (addr_len < SIN6_LEN_RFC2133)
929 return -EINVAL;
930 daddr = &sin6->sin6_addr;
931 break;
932 case AF_INET:
933 goto do_udp_sendmsg;
934 case AF_UNSPEC:
935 msg->msg_name = sin6 = NULL;
936 msg->msg_namelen = addr_len = 0;
937 daddr = NULL;
938 break;
939 default:
940 return -EINVAL;
941 }
942 } else if (!up->pending) {
943 if (sk->sk_state != TCP_ESTABLISHED)
944 return -EDESTADDRREQ;
945 daddr = &np->daddr;
1ab1457c 946 } else
1da177e4
LT		 947 daddr = NULL;
948
949 if (daddr) {
e773e4fa 950 if (ipv6_addr_v4mapped(daddr)) {
1da177e4
LT		 951 struct sockaddr_in sin;
952 sin.sin_family = AF_INET;
c720c7e8 953 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1da177e4
LT		 954 sin.sin_addr.s_addr = daddr->s6_addr32[3];
955 msg->msg_name = &sin;
956 msg->msg_namelen = sizeof(sin);
957do_udp_sendmsg:
958 if (__ipv6_only_sock(sk))
959 return -ENETUNREACH;
960 return udp_sendmsg(iocb, sk, msg, len);
961 }
962 }
963
964 if (up->pending == AF_INET)
965 return udp_sendmsg(iocb, sk, msg, len);
966
967 /* Rough check on arithmetic overflow,
b59e139b 968 better check is made in ip6_append_data().
1da177e4
LT		 969 */
970 if (len > INT_MAX - sizeof(struct udphdr))
971 return -EMSGSIZE;
1ab1457c 972
1da177e4
LT		 973 if (up->pending) {
974 /*
975 * There are pending frames.
976 * The socket lock must be held while it's corked.
977 */
978 lock_sock(sk);
979 if (likely(up->pending)) {
980 if (unlikely(up->pending != AF_INET6)) {
981 release_sock(sk);
982 return -EAFNOSUPPORT;
983 }
984 dst = NULL;
985 goto do_append_data;
986 }
987 release_sock(sk);
988 }
989 ulen += sizeof(struct udphdr);
990
132a55f3 991 memset(&fl, 0, sizeof(fl));
1da177e4
LT		 992
993 if (sin6) {
994 if (sin6->sin6_port == 0)
995 return -EINVAL;
996
132a55f3 997 fl.fl_ip_dport = sin6->sin6_port;
1da177e4
LT		 998 daddr = &sin6->sin6_addr;
999
1000 if (np->sndflow) {
132a55f3
HX		 1001 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1002 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
1003 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1da177e4
LT		 1004 if (flowlabel == NULL)
1005 return -EINVAL;
1006 daddr = &flowlabel->dst;
1007 }
1008 }
1009
1010 /*
1011 * Otherwise it will be difficult to maintain
1012 * sk->sk_dst_cache.
1013 */
1014 if (sk->sk_state == TCP_ESTABLISHED &&
1015 ipv6_addr_equal(daddr, &np->daddr))
1016 daddr = &np->daddr;
1017
1018 if (addr_len >= sizeof(struct sockaddr_in6) &&
1019 sin6->sin6_scope_id &&
1020 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
132a55f3 1021 fl.oif = sin6->sin6_scope_id;
1da177e4
LT		 1022 } else {
1023 if (sk->sk_state != TCP_ESTABLISHED)
1024 return -EDESTADDRREQ;
1025
c720c7e8 1026 fl.fl_ip_dport = inet->inet_dport;
1da177e4 1027 daddr = &np->daddr;
132a55f3 1028 fl.fl6_flowlabel = np->flow_label;
987905de 1029 connected = 1;
1da177e4
LT		 1030 }
1031
132a55f3
HX		 1032 if (!fl.oif)
1033 fl.oif = sk->sk_bound_dev_if;
1da177e4 1034
9f690db7
YH		 1035 if (!fl.oif)
1036 fl.oif = np->sticky_pktinfo.ipi6_ifindex;
1037
51953d5b
BH		 1038 fl.mark = sk->sk_mark;
1039
1da177e4
LT		 1040 if (msg->msg_controllen) {
1041 opt = &opt_space;
1042 memset(opt, 0, sizeof(struct ipv6_txoptions));
1043 opt->tot_len = sizeof(*opt);
1044
91e1908f 1045 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
1da177e4
LT		 1046 if (err < 0) {
1047 fl6_sock_release(flowlabel);
1048 return err;
1049 }
132a55f3
HX		 1050 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1051 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1da177e4
LT		 1052 if (flowlabel == NULL)
1053 return -EINVAL;
1054 }
1055 if (!(opt->opt_nflen|opt->opt_flen))
1056 opt = NULL;
987905de 1057 connected = 0;
1da177e4
LT		 1058 }
1059 if (opt == NULL)
1060 opt = np->opt;
df9890c3
YH		 1061 if (flowlabel)
1062 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1063 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4 1064
ba4e58ec 1065 fl.proto = sk->sk_protocol;
876c7f41
BH		 1066 if (!ipv6_addr_any(daddr))
1067 ipv6_addr_copy(&fl.fl6_dst, daddr);
1068 else
1069 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
132a55f3
HX		 1070 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
1071 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
c720c7e8 1072 fl.fl_ip_sport = inet->inet_sport;
1ab1457c 1073
1da177e4
LT		 1074 /* merge ip6_build_xmit from ip6_output */
1075 if (opt && opt->srcrt) {
1076 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
132a55f3
HX		 1077 ipv6_addr_copy(&final, &fl.fl6_dst);
1078 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1da177e4 1079 final_p = &final;
987905de 1080 connected = 0;
1da177e4
LT		 1081 }
1082
132a55f3
HX		 1083 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
1084 fl.oif = np->mcast_oif;
987905de
MK		 1085 connected = 0;
1086 }
1da177e4 1087
132a55f3 1088 security_sk_classify_flow(sk, &fl);
beb8d13b 1089
132a55f3 1090 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1da177e4
LT		 1091 if (err)
1092 goto out;
1093 if (final_p)
132a55f3 1094 ipv6_addr_copy(&fl.fl6_dst, final_p);
1da177e4 1095
52479b62
AD		 1096 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1097 if (err < 0) {
14e50e57
DM		 1098 if (err == -EREMOTE)
1099 err = ip6_dst_blackhole(sk, &dst, &fl);
1100 if (err < 0)
1101 goto out;
1102 }
1da177e4
LT		 1103
1104 if (hlimit < 0) {
132a55f3 1105 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1da177e4
LT		 1106 hlimit = np->mcast_hops;
1107 else
1108 hlimit = np->hop_limit;
1109 if (hlimit < 0)
6b75d090 1110 hlimit = ip6_dst_hoplimit(dst);
1da177e4
LT		 1111 }
1112
e651f03a 1113 if (tclass < 0)
41a1f8ea 1114 tclass = np->tclass;
41a1f8ea 1115
1da177e4
LT		 1116 if (msg->msg_flags&MSG_CONFIRM)
1117 goto do_confirm;
1118back_from_confirm:
1119
1120 lock_sock(sk);
1121 if (unlikely(up->pending)) {
1122 /* The socket is already corked while preparing it. */
1123 /* ... which is an evident application bug. --ANK */
1124 release_sock(sk);
1125
64ce2073 1126 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 1127 err = -EINVAL;
1128 goto out;
1129 }
1130
1131 up->pending = AF_INET6;
1132
1133do_append_data:
1134 up->len += ulen;
ba4e58ec
GR		 1135 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1136 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
132a55f3 1137 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
41a1f8ea
YH		 1138 (struct rt6_info*)dst,
1139 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1da177e4
LT		 1140 if (err)
1141 udp_v6_flush_pending_frames(sk);
1142 else if (!corkreq)
4c0a6cb0 1143 err = udp_v6_push_pending_frames(sk);
1e0c14f4
HX		 1144 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1145 up->pending = 0;
1da177e4 1146
a5e7c210
DM		 1147 if (dst) {
1148 if (connected) {
1149 ip6_dst_store(sk, dst,
132a55f3 1150 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
8e1ef0a9
YH		 1151 &np->daddr : NULL,
1152#ifdef CONFIG_IPV6_SUBTREES
132a55f3 1153 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
8e1ef0a9
YH		 1154 &np->saddr :
1155#endif
1156 NULL);
a5e7c210
DM		 1157 } else {
1158 dst_release(dst);
1159 }
a3c96089 1160 dst = NULL;
a5e7c210
DM		 1161 }
1162
1da177e4
LT		 1163 if (err > 0)
1164 err = np->recverr ? net_xmit_errno(err) : 0;
1165 release_sock(sk);
1166out:
a3c96089 1167 dst_release(dst);
1da177e4 1168 fl6_sock_release(flowlabel);
cd562c98 1169 if (!err)
1da177e4 1170 return len;
a18135eb
DM		 1171 /*
1172 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1173 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1174 * we don't have a good statistic (IpOutDiscards but it can be too many
1175 * things). We could add another new stat but at least for now that
1176 * seems like overkill.
1177 */
1178 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
235b9f7a
PE		 1179 UDP6_INC_STATS_USER(sock_net(sk),
1180 UDP_MIB_SNDBUFERRORS, is_udplite);
a18135eb 1181 }
1da177e4
LT		 1182 return err;
1183
1184do_confirm:
1185 dst_confirm(dst);
1186 if (!(msg->msg_flags&MSG_PROBE) || len)
1187 goto back_from_confirm;
1188 err = 0;
1189 goto out;
1190}
1191
7d06b2e0 1192void udpv6_destroy_sock(struct sock *sk)
1da177e4
LT		 1193{
1194 lock_sock(sk);
1195 udp_v6_flush_pending_frames(sk);
1196 release_sock(sk);
1197
1198 inet6_destroy_sock(sk);
1da177e4
LT		 1199}
1200
1201/*
1202 * Socket option code for UDP
1203 */
ba4e58ec 1204int udpv6_setsockopt(struct sock *sk, int level, int optname,
b7058842 1205 char __user *optval, unsigned int optlen)
3fdadf7d 1206{
db8dac20 1207 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 1208 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1209 udp_v6_push_pending_frames);
ba4e58ec 1210 return ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1211}
1212
1213#ifdef CONFIG_COMPAT
ba4e58ec 1214int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
b7058842 1215 char __user *optval, unsigned int optlen)
3fdadf7d 1216{
db8dac20 1217 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 1218 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1219 udp_v6_push_pending_frames);
ba4e58ec 1220 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1221}
1222#endif
1223
ba4e58ec
GR		 1224int udpv6_getsockopt(struct sock *sk, int level, int optname,
1225 char __user *optval, int __user *optlen)
3fdadf7d 1226{
db8dac20 1227 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 1228 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 1229 return ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1230}
1231
1232#ifdef CONFIG_COMPAT
ba4e58ec
GR		 1233int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1234 char __user *optval, int __user *optlen)
3fdadf7d 1235{
db8dac20 1236 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 1237 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 1238 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1239}
1240#endif
1241
ba735425
SS		 1242static int udp6_ufo_send_check(struct sk_buff *skb)
1243{
1244 struct ipv6hdr *ipv6h;
1245 struct udphdr *uh;
1246
1247 if (!pskb_may_pull(skb, sizeof(*uh)))
1248 return -EINVAL;
1249
1250 ipv6h = ipv6_hdr(skb);
1251 uh = udp_hdr(skb);
1252
1253 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1254 IPPROTO_UDP, 0);
1255 skb->csum_start = skb_transport_header(skb) - skb->head;
1256 skb->csum_offset = offsetof(struct udphdr, check);
1257 skb->ip_summed = CHECKSUM_PARTIAL;
1258 return 0;
1259}
1260
1261static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
1262{
1263 struct sk_buff *segs = ERR_PTR(-EINVAL);
1264 unsigned int mss;
1265 unsigned int unfrag_ip6hlen, unfrag_len;
1266 struct frag_hdr *fptr;
1267 u8 *mac_start, *prevhdr;
1268 u8 nexthdr;
1269 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1270 int offset;
1271 __wsum csum;
1272
1273 mss = skb_shinfo(skb)->gso_size;
1274 if (unlikely(skb->len <= mss))
1275 goto out;
1276
1277 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1278 /* Packet is from an untrusted source, reset gso_segs. */
1279 int type = skb_shinfo(skb)->gso_type;
1280
1281 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1282 !(type & (SKB_GSO_UDP))))
1283 goto out;
1284
1285 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1286
1287 segs = NULL;
1288 goto out;
1289 }
1290
1291 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1292 * do checksum of UDP packets sent as multiple IP fragments.
1293 */
1294 offset = skb->csum_start - skb_headroom(skb);
1295 csum = skb_checksum(skb, offset, skb->len- offset, 0);
1296 offset += skb->csum_offset;
1297 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1298 skb->ip_summed = CHECKSUM_NONE;
1299
1300 /* Check if there is enough headroom to insert fragment header. */
1301 if ((skb_headroom(skb) < frag_hdr_sz) &&
1302 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1303 goto out;
1304
1305 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1306 * bytes to insert fragment header.
1307 */
1308 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1309 nexthdr = *prevhdr;
1310 *prevhdr = NEXTHDR_FRAGMENT;
1311 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1312 unfrag_ip6hlen;
1313 mac_start = skb_mac_header(skb);
1314 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1315
1316 skb->mac_header -= frag_hdr_sz;
1317 skb->network_header -= frag_hdr_sz;
1318
1319 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1320 fptr->nexthdr = nexthdr;
1321 fptr->reserved = 0;
1322 ipv6_select_ident(fptr);
1323
1324 /* Fragment the skb. ipv6 header and the remaining fields of the
1325 * fragment header are updated in ipv6_gso_segment()
1326 */
1327 segs = skb_segment(skb, features);
1328
1329out:
1330 return segs;
1331}
1332
41135cc8 1333static const struct inet6_protocol udpv6_protocol = {
1da177e4
LT		 1334 .handler = udpv6_rcv,
1335 .err_handler = udpv6_err,
ba735425
SS		 1336 .gso_send_check = udp6_ufo_send_check,
1337 .gso_segment = udp6_ufo_fragment,
1da177e4
LT		 1338 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1339};
1340
1341/* ------------------------------------------------------------------------ */
1342#ifdef CONFIG_PROC_FS
1343
1344static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1345{
1346 struct inet_sock *inet = inet_sk(sp);
1347 struct ipv6_pinfo *np = inet6_sk(sp);
1348 struct in6_addr *dest, *src;
1349 __u16 destp, srcp;
1350
1351 dest = &np->daddr;
1352 src = &np->rcv_saddr;
c720c7e8
ED		 1353 destp = ntohs(inet->inet_dport);
1354 srcp = ntohs(inet->inet_sport);
1da177e4 1355 seq_printf(seq,
f86dcc5a 1356 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
cb61cb9b 1357 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1da177e4
LT		 1358 bucket,
1359 src->s6_addr32[0], src->s6_addr32[1],
1360 src->s6_addr32[2], src->s6_addr32[3], srcp,
1361 dest->s6_addr32[0], dest->s6_addr32[1],
1362 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1ab1457c 1363 sp->sk_state,
31e6d363
ED		 1364 sk_wmem_alloc_get(sp),
1365 sk_rmem_alloc_get(sp),
1da177e4
LT		 1366 0, 0L, 0,
1367 sock_i_uid(sp), 0,
1368 sock_i_ino(sp),
cb61cb9b
ED		 1369 atomic_read(&sp->sk_refcnt), sp,
1370 atomic_read(&sp->sk_drops));
1da177e4
LT		 1371}
1372
ba4e58ec 1373int udp6_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 1374{
1375 if (v == SEQ_START_TOKEN)
1376 seq_printf(seq,
1377 " sl "
1378 "local_address "
1379 "remote_address "
1380 "st tx_queue rx_queue tr tm->when retrnsmt"
cb61cb9b 1381 " uid timeout inode ref pointer drops\n");
1da177e4
LT		 1382 else
1383 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1384 return 0;
1385}
1386
1da177e4 1387static struct udp_seq_afinfo udp6_seq_afinfo = {
1da177e4
LT		 1388 .name = "udp6",
1389 .family = AF_INET6,
645ca708 1390 .udp_table = &udp_table,
4ad96d39
DL		 1391 .seq_fops = {
1392 .owner = THIS_MODULE,
1393 },
dda61925
DL		 1394 .seq_ops = {
1395 .show = udp6_seq_show,
1396 },
1da177e4
LT		 1397};
1398
0c96d8c5 1399int udp6_proc_init(struct net *net)
1da177e4 1400{
0c96d8c5 1401 return udp_proc_register(net, &udp6_seq_afinfo);
1da177e4
LT		 1402}
1403
0c96d8c5
DL		 1404void udp6_proc_exit(struct net *net) {
1405 udp_proc_unregister(net, &udp6_seq_afinfo);
1da177e4
LT		 1406}
1407#endif /* CONFIG_PROC_FS */
1408
1409/* ------------------------------------------------------------------------ */
1410
1411struct proto udpv6_prot = {
543d9cfe
ACM		 1412 .name = "UDPv6",
1413 .owner = THIS_MODULE,
ba4e58ec 1414 .close = udp_lib_close,
543d9cfe
ACM		 1415 .connect = ip6_datagram_connect,
1416 .disconnect = udp_disconnect,
1417 .ioctl = udp_ioctl,
1418 .destroy = udpv6_destroy_sock,
1419 .setsockopt = udpv6_setsockopt,
1420 .getsockopt = udpv6_getsockopt,
1421 .sendmsg = udpv6_sendmsg,
1422 .recvmsg = udpv6_recvmsg,
1423 .backlog_rcv = udpv6_queue_rcv_skb,
ba4e58ec
GR		 1424 .hash = udp_lib_hash,
1425 .unhash = udp_lib_unhash,
543d9cfe 1426 .get_port = udp_v6_get_port,
95766fff
HA		 1427 .memory_allocated = &udp_memory_allocated,
1428 .sysctl_mem = sysctl_udp_mem,
1429 .sysctl_wmem = &sysctl_udp_wmem_min,
1430 .sysctl_rmem = &sysctl_udp_rmem_min,
543d9cfe 1431 .obj_size = sizeof(struct udp6_sock),
271b72c7 1432 .slab_flags = SLAB_DESTROY_BY_RCU,
645ca708 1433 .h.udp_table = &udp_table,
3fdadf7d 1434#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1435 .compat_setsockopt = compat_udpv6_setsockopt,
1436 .compat_getsockopt = compat_udpv6_getsockopt,
3fdadf7d 1437#endif
1da177e4
LT		 1438};
1439
1da177e4
LT		 1440static struct inet_protosw udpv6_protosw = {
1441 .type = SOCK_DGRAM,
1442 .protocol = IPPROTO_UDP,
1443 .prot = &udpv6_prot,
1444 .ops = &inet6_dgram_ops,
1da177e4
LT		 1445 .no_check = UDP_CSUM_DEFAULT,
1446 .flags = INET_PROTOSW_PERMANENT,
1447};
1448
1449
7f4e4868 1450int __init udpv6_init(void)
1da177e4 1451{
7f4e4868
DL		 1452 int ret;
1453
1454 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1455 if (ret)
1456 goto out;
1457
1458 ret = inet6_register_protosw(&udpv6_protosw);
1459 if (ret)
1460 goto out_udpv6_protocol;
1461out:
1462 return ret;
1463
1464out_udpv6_protocol:
1465 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1466 goto out;
1467}
1468
09f7709f 1469void udpv6_exit(void)
7f4e4868
DL		 1470{
1471 inet6_unregister_protosw(&udpv6_protosw);
1472 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1da177e4 1473}
kernel source for telekom puls (alcatel/mediatek)