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sparc: unify sections.h
[linux-2.6/mini2440.git] / net / ipv6 / udp.c
blob8b48512ebf6ac98ce279a7ca69daa6639970f1e3
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
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
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
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>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <asm/uaccess.h>
38
39 #include <net/ndisc.h>
40 #include <net/protocol.h>
41 #include <net/transp_v6.h>
42 #include <net/ip6_route.h>
43 #include <net/raw.h>
44 #include <net/tcp_states.h>
45 #include <net/ip6_checksum.h>
46 #include <net/xfrm.h>
47
48 #include <linux/proc_fs.h>
49 #include <linux/seq_file.h>
50 #include "udp_impl.h"
51
52 int udp_v6_get_port(struct sock *sk, unsigned short snum)
53 {
54 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
55 }
56
57 static struct sock *__udp6_lib_lookup(struct net *net,
58 struct in6_addr *saddr, __be16 sport,
59 struct in6_addr *daddr, __be16 dport,
60 int dif, struct hlist_head udptable[])
61 {
62 struct sock *sk, *result = NULL;
63 struct hlist_node *node;
64 unsigned short hnum = ntohs(dport);
65 int badness = -1;
66
67 read_lock(&udp_hash_lock);
68 sk_for_each(sk, node, &udptable[udp_hashfn(net, hnum)]) {
69 struct inet_sock *inet = inet_sk(sk);
70
71 if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
72 sk->sk_family == PF_INET6) {
73 struct ipv6_pinfo *np = inet6_sk(sk);
74 int score = 0;
75 if (inet->dport) {
76 if (inet->dport != sport)
77 continue;
78 score++;
79 }
80 if (!ipv6_addr_any(&np->rcv_saddr)) {
81 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
82 continue;
83 score++;
84 }
85 if (!ipv6_addr_any(&np->daddr)) {
86 if (!ipv6_addr_equal(&np->daddr, saddr))
87 continue;
88 score++;
89 }
90 if (sk->sk_bound_dev_if) {
91 if (sk->sk_bound_dev_if != dif)
92 continue;
93 score++;
94 }
95 if (score == 4) {
96 result = sk;
97 break;
98 } else if (score > badness) {
99 result = sk;
100 badness = score;
101 }
102 }
103 }
104 if (result)
105 sock_hold(result);
106 read_unlock(&udp_hash_lock);
107 return result;
108 }
109
110 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
111 __be16 sport, __be16 dport,
112 struct hlist_head udptable[])
113 {
114 struct sock *sk;
115 struct ipv6hdr *iph = ipv6_hdr(skb);
116
117 if (unlikely(sk = skb_steal_sock(skb)))
118 return sk;
119 else
120 return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport,
121 &iph->daddr, dport, inet6_iif(skb),
122 udptable);
123 }
124
125 /*
126 * This should be easy, if there is something there we
127 * return it, otherwise we block.
128 */
129
130 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
131 struct msghdr *msg, size_t len,
132 int noblock, int flags, int *addr_len)
133 {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
136 struct sk_buff *skb;
137 unsigned int ulen, copied;
138 int peeked;
139 int err;
140 int is_udplite = IS_UDPLITE(sk);
141 int is_udp4;
142
143 if (addr_len)
144 *addr_len=sizeof(struct sockaddr_in6);
145
146 if (flags & MSG_ERRQUEUE)
147 return ipv6_recv_error(sk, msg, len);
148
149 try_again:
150 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
151 &peeked, &err);
152 if (!skb)
153 goto out;
154
155 ulen = skb->len - sizeof(struct udphdr);
156 copied = len;
157 if (copied > ulen)
158 copied = ulen;
159 else if (copied < ulen)
160 msg->msg_flags |= MSG_TRUNC;
161
162 is_udp4 = (skb->protocol == htons(ETH_P_IP));
163
164 /*
165 * If checksum is needed at all, try to do it while copying the
166 * data. If the data is truncated, or if we only want a partial
167 * coverage checksum (UDP-Lite), do it before the copy.
168 */
169
170 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
171 if (udp_lib_checksum_complete(skb))
172 goto csum_copy_err;
173 }
174
175 if (skb_csum_unnecessary(skb))
176 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
177 msg->msg_iov, copied );
178 else {
179 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
180 if (err == -EINVAL)
181 goto csum_copy_err;
182 }
183 if (err)
184 goto out_free;
185
186 if (!peeked) {
187 if (is_udp4)
188 UDP_INC_STATS_USER(sock_net(sk),
189 UDP_MIB_INDATAGRAMS, is_udplite);
190 else
191 UDP6_INC_STATS_USER(sock_net(sk),
192 UDP_MIB_INDATAGRAMS, is_udplite);
193 }
194
195 sock_recv_timestamp(msg, sk, skb);
196
197 /* Copy the address. */
198 if (msg->msg_name) {
199 struct sockaddr_in6 *sin6;
200
201 sin6 = (struct sockaddr_in6 *) msg->msg_name;
202 sin6->sin6_family = AF_INET6;
203 sin6->sin6_port = udp_hdr(skb)->source;
204 sin6->sin6_flowinfo = 0;
205 sin6->sin6_scope_id = 0;
206
207 if (is_udp4)
208 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
209 htonl(0xffff), ip_hdr(skb)->saddr);
210 else {
211 ipv6_addr_copy(&sin6->sin6_addr,
212 &ipv6_hdr(skb)->saddr);
213 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
214 sin6->sin6_scope_id = IP6CB(skb)->iif;
215 }
216
217 }
218 if (is_udp4) {
219 if (inet->cmsg_flags)
220 ip_cmsg_recv(msg, skb);
221 } else {
222 if (np->rxopt.all)
223 datagram_recv_ctl(sk, msg, skb);
224 }
225
226 err = copied;
227 if (flags & MSG_TRUNC)
228 err = ulen;
229
230 out_free:
231 lock_sock(sk);
232 skb_free_datagram(sk, skb);
233 release_sock(sk);
234 out:
235 return err;
236
237 csum_copy_err:
238 lock_sock(sk);
239 if (!skb_kill_datagram(sk, skb, flags)) {
240 if (is_udp4)
241 UDP_INC_STATS_USER(sock_net(sk),
242 UDP_MIB_INERRORS, is_udplite);
243 else
244 UDP6_INC_STATS_USER(sock_net(sk),
245 UDP_MIB_INERRORS, is_udplite);
246 }
247 release_sock(sk);
248
249 if (flags & MSG_DONTWAIT)
250 return -EAGAIN;
251 goto try_again;
252 }
253
254 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
255 int type, int code, int offset, __be32 info,
256 struct hlist_head udptable[] )
257 {
258 struct ipv6_pinfo *np;
259 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
260 struct in6_addr *saddr = &hdr->saddr;
261 struct in6_addr *daddr = &hdr->daddr;
262 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
263 struct sock *sk;
264 int err;
265
266 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
267 saddr, uh->source, inet6_iif(skb), udptable);
268 if (sk == NULL)
269 return;
270
271 np = inet6_sk(sk);
272
273 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
274 goto out;
275
276 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
277 goto out;
278
279 if (np->recverr)
280 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
281
282 sk->sk_err = err;
283 sk->sk_error_report(sk);
284 out:
285 sock_put(sk);
286 }
287
288 static __inline__ void udpv6_err(struct sk_buff *skb,
289 struct inet6_skb_parm *opt, int type,
290 int code, int offset, __be32 info )
291 {
292 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
293 }
294
295 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
296 {
297 struct udp_sock *up = udp_sk(sk);
298 int rc;
299 int is_udplite = IS_UDPLITE(sk);
300
301 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
302 goto drop;
303
304 /*
305 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
306 */
307 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
308
309 if (up->pcrlen == 0) { /* full coverage was set */
310 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
311 " %d while full coverage %d requested\n",
312 UDP_SKB_CB(skb)->cscov, skb->len);
313 goto drop;
314 }
315 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
316 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
317 "too small, need min %d\n",
318 UDP_SKB_CB(skb)->cscov, up->pcrlen);
319 goto drop;
320 }
321 }
322
323 if (sk->sk_filter) {
324 if (udp_lib_checksum_complete(skb))
325 goto drop;
326 }
327
328 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
329 /* Note that an ENOMEM error is charged twice */
330 if (rc == -ENOMEM) {
331 UDP6_INC_STATS_BH(sock_net(sk),
332 UDP_MIB_RCVBUFERRORS, is_udplite);
333 atomic_inc(&sk->sk_drops);
334 }
335 goto drop;
336 }
337
338 return 0;
339 drop:
340 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
341 kfree_skb(skb);
342 return -1;
343 }
344
345 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
346 __be16 loc_port, struct in6_addr *loc_addr,
347 __be16 rmt_port, struct in6_addr *rmt_addr,
348 int dif)
349 {
350 struct hlist_node *node;
351 struct sock *s = sk;
352 unsigned short num = ntohs(loc_port);
353
354 sk_for_each_from(s, node) {
355 struct inet_sock *inet = inet_sk(s);
356
357 if (!net_eq(sock_net(s), net))
358 continue;
359
360 if (s->sk_hash == num && s->sk_family == PF_INET6) {
361 struct ipv6_pinfo *np = inet6_sk(s);
362 if (inet->dport) {
363 if (inet->dport != rmt_port)
364 continue;
365 }
366 if (!ipv6_addr_any(&np->daddr) &&
367 !ipv6_addr_equal(&np->daddr, rmt_addr))
368 continue;
369
370 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
371 continue;
372
373 if (!ipv6_addr_any(&np->rcv_saddr)) {
374 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
375 continue;
376 }
377 if (!inet6_mc_check(s, loc_addr, rmt_addr))
378 continue;
379 return s;
380 }
381 }
382 return NULL;
383 }
384
385 /*
386 * Note: called only from the BH handler context,
387 * so we don't need to lock the hashes.
388 */
389 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
390 struct in6_addr *saddr, struct in6_addr *daddr,
391 struct hlist_head udptable[])
392 {
393 struct sock *sk, *sk2;
394 const struct udphdr *uh = udp_hdr(skb);
395 int dif;
396
397 read_lock(&udp_hash_lock);
398 sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]);
399 dif = inet6_iif(skb);
400 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
401 if (!sk) {
402 kfree_skb(skb);
403 goto out;
404 }
405
406 sk2 = sk;
407 while ((sk2 = udp_v6_mcast_next(net, sk_next(sk2), uh->dest, daddr,
408 uh->source, saddr, dif))) {
409 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
410 if (buff) {
411 bh_lock_sock(sk2);
412 if (!sock_owned_by_user(sk2))
413 udpv6_queue_rcv_skb(sk2, buff);
414 else
415 sk_add_backlog(sk2, buff);
416 bh_unlock_sock(sk2);
417 }
418 }
419 bh_lock_sock(sk);
420 if (!sock_owned_by_user(sk))
421 udpv6_queue_rcv_skb(sk, skb);
422 else
423 sk_add_backlog(sk, skb);
424 bh_unlock_sock(sk);
425 out:
426 read_unlock(&udp_hash_lock);
427 return 0;
428 }
429
430 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
431 int proto)
432 {
433 int err;
434
435 UDP_SKB_CB(skb)->partial_cov = 0;
436 UDP_SKB_CB(skb)->cscov = skb->len;
437
438 if (proto == IPPROTO_UDPLITE) {
439 err = udplite_checksum_init(skb, uh);
440 if (err)
441 return err;
442 }
443
444 if (uh->check == 0) {
445 /* RFC 2460 section 8.1 says that we SHOULD log
446 this error. Well, it is reasonable.
447 */
448 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
449 return 1;
450 }
451 if (skb->ip_summed == CHECKSUM_COMPLETE &&
452 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
453 skb->len, proto, skb->csum))
454 skb->ip_summed = CHECKSUM_UNNECESSARY;
455
456 if (!skb_csum_unnecessary(skb))
457 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
458 &ipv6_hdr(skb)->daddr,
459 skb->len, proto, 0));
460
461 return 0;
462 }
463
464 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
465 int proto)
466 {
467 struct sock *sk;
468 struct udphdr *uh;
469 struct net_device *dev = skb->dev;
470 struct in6_addr *saddr, *daddr;
471 u32 ulen = 0;
472 struct net *net = dev_net(skb->dev);
473
474 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
475 goto short_packet;
476
477 saddr = &ipv6_hdr(skb)->saddr;
478 daddr = &ipv6_hdr(skb)->daddr;
479 uh = udp_hdr(skb);
480
481 ulen = ntohs(uh->len);
482 if (ulen > skb->len)
483 goto short_packet;
484
485 if (proto == IPPROTO_UDP) {
486 /* UDP validates ulen. */
487
488 /* Check for jumbo payload */
489 if (ulen == 0)
490 ulen = skb->len;
491
492 if (ulen < sizeof(*uh))
493 goto short_packet;
494
495 if (ulen < skb->len) {
496 if (pskb_trim_rcsum(skb, ulen))
497 goto short_packet;
498 saddr = &ipv6_hdr(skb)->saddr;
499 daddr = &ipv6_hdr(skb)->daddr;
500 uh = udp_hdr(skb);
501 }
502 }
503
504 if (udp6_csum_init(skb, uh, proto))
505 goto discard;
506
507 /*
508 * Multicast receive code
509 */
510 if (ipv6_addr_is_multicast(daddr))
511 return __udp6_lib_mcast_deliver(net, skb,
512 saddr, daddr, udptable);
513
514 /* Unicast */
515
516 /*
517 * check socket cache ... must talk to Alan about his plans
518 * for sock caches... i'll skip this for now.
519 */
520 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
521
522 if (sk == NULL) {
523 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
524 goto discard;
525
526 if (udp_lib_checksum_complete(skb))
527 goto discard;
528 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
529 proto == IPPROTO_UDPLITE);
530
531 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
532
533 kfree_skb(skb);
534 return 0;
535 }
536
537 /* deliver */
538
539 bh_lock_sock(sk);
540 if (!sock_owned_by_user(sk))
541 udpv6_queue_rcv_skb(sk, skb);
542 else
543 sk_add_backlog(sk, skb);
544 bh_unlock_sock(sk);
545 sock_put(sk);
546 return 0;
547
548 short_packet:
549 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
550 proto == IPPROTO_UDPLITE ? "-Lite" : "",
551 ulen, skb->len);
552
553 discard:
554 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
555 kfree_skb(skb);
556 return 0;
557 }
558
559 static __inline__ int udpv6_rcv(struct sk_buff *skb)
560 {
561 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
562 }
563
564 /*
565 * Throw away all pending data and cancel the corking. Socket is locked.
566 */
567 static void udp_v6_flush_pending_frames(struct sock *sk)
568 {
569 struct udp_sock *up = udp_sk(sk);
570
571 if (up->pending == AF_INET)
572 udp_flush_pending_frames(sk);
573 else if (up->pending) {
574 up->len = 0;
575 up->pending = 0;
576 ip6_flush_pending_frames(sk);
577 }
578 }
579
580 /*
581 * Sending
582 */
583
584 static int udp_v6_push_pending_frames(struct sock *sk)
585 {
586 struct sk_buff *skb;
587 struct udphdr *uh;
588 struct udp_sock *up = udp_sk(sk);
589 struct inet_sock *inet = inet_sk(sk);
590 struct flowi *fl = &inet->cork.fl;
591 int err = 0;
592 int is_udplite = IS_UDPLITE(sk);
593 __wsum csum = 0;
594
595 /* Grab the skbuff where UDP header space exists. */
596 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
597 goto out;
598
599 /*
600 * Create a UDP header
601 */
602 uh = udp_hdr(skb);
603 uh->source = fl->fl_ip_sport;
604 uh->dest = fl->fl_ip_dport;
605 uh->len = htons(up->len);
606 uh->check = 0;
607
608 if (is_udplite)
609 csum = udplite_csum_outgoing(sk, skb);
610 else
611 csum = udp_csum_outgoing(sk, skb);
612
613 /* add protocol-dependent pseudo-header */
614 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
615 up->len, fl->proto, csum );
616 if (uh->check == 0)
617 uh->check = CSUM_MANGLED_0;
618
619 err = ip6_push_pending_frames(sk);
620 out:
621 up->len = 0;
622 up->pending = 0;
623 if (!err)
624 UDP6_INC_STATS_USER(sock_net(sk),
625 UDP_MIB_OUTDATAGRAMS, is_udplite);
626 return err;
627 }
628
629 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
630 struct msghdr *msg, size_t len)
631 {
632 struct ipv6_txoptions opt_space;
633 struct udp_sock *up = udp_sk(sk);
634 struct inet_sock *inet = inet_sk(sk);
635 struct ipv6_pinfo *np = inet6_sk(sk);
636 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
637 struct in6_addr *daddr, *final_p = NULL, final;
638 struct ipv6_txoptions *opt = NULL;
639 struct ip6_flowlabel *flowlabel = NULL;
640 struct flowi fl;
641 struct dst_entry *dst;
642 int addr_len = msg->msg_namelen;
643 int ulen = len;
644 int hlimit = -1;
645 int tclass = -1;
646 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
647 int err;
648 int connected = 0;
649 int is_udplite = IS_UDPLITE(sk);
650 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
651
652 /* destination address check */
653 if (sin6) {
654 if (addr_len < offsetof(struct sockaddr, sa_data))
655 return -EINVAL;
656
657 switch (sin6->sin6_family) {
658 case AF_INET6:
659 if (addr_len < SIN6_LEN_RFC2133)
660 return -EINVAL;
661 daddr = &sin6->sin6_addr;
662 break;
663 case AF_INET:
664 goto do_udp_sendmsg;
665 case AF_UNSPEC:
666 msg->msg_name = sin6 = NULL;
667 msg->msg_namelen = addr_len = 0;
668 daddr = NULL;
669 break;
670 default:
671 return -EINVAL;
672 }
673 } else if (!up->pending) {
674 if (sk->sk_state != TCP_ESTABLISHED)
675 return -EDESTADDRREQ;
676 daddr = &np->daddr;
677 } else
678 daddr = NULL;
679
680 if (daddr) {
681 if (ipv6_addr_v4mapped(daddr)) {
682 struct sockaddr_in sin;
683 sin.sin_family = AF_INET;
684 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
685 sin.sin_addr.s_addr = daddr->s6_addr32[3];
686 msg->msg_name = &sin;
687 msg->msg_namelen = sizeof(sin);
688 do_udp_sendmsg:
689 if (__ipv6_only_sock(sk))
690 return -ENETUNREACH;
691 return udp_sendmsg(iocb, sk, msg, len);
692 }
693 }
694
695 if (up->pending == AF_INET)
696 return udp_sendmsg(iocb, sk, msg, len);
697
698 /* Rough check on arithmetic overflow,
699 better check is made in ip6_append_data().
700 */
701 if (len > INT_MAX - sizeof(struct udphdr))
702 return -EMSGSIZE;
703
704 if (up->pending) {
705 /*
706 * There are pending frames.
707 * The socket lock must be held while it's corked.
708 */
709 lock_sock(sk);
710 if (likely(up->pending)) {
711 if (unlikely(up->pending != AF_INET6)) {
712 release_sock(sk);
713 return -EAFNOSUPPORT;
714 }
715 dst = NULL;
716 goto do_append_data;
717 }
718 release_sock(sk);
719 }
720 ulen += sizeof(struct udphdr);
721
722 memset(&fl, 0, sizeof(fl));
723
724 if (sin6) {
725 if (sin6->sin6_port == 0)
726 return -EINVAL;
727
728 fl.fl_ip_dport = sin6->sin6_port;
729 daddr = &sin6->sin6_addr;
730
731 if (np->sndflow) {
732 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
733 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
734 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
735 if (flowlabel == NULL)
736 return -EINVAL;
737 daddr = &flowlabel->dst;
738 }
739 }
740
741 /*
742 * Otherwise it will be difficult to maintain
743 * sk->sk_dst_cache.
744 */
745 if (sk->sk_state == TCP_ESTABLISHED &&
746 ipv6_addr_equal(daddr, &np->daddr))
747 daddr = &np->daddr;
748
749 if (addr_len >= sizeof(struct sockaddr_in6) &&
750 sin6->sin6_scope_id &&
751 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
752 fl.oif = sin6->sin6_scope_id;
753 } else {
754 if (sk->sk_state != TCP_ESTABLISHED)
755 return -EDESTADDRREQ;
756
757 fl.fl_ip_dport = inet->dport;
758 daddr = &np->daddr;
759 fl.fl6_flowlabel = np->flow_label;
760 connected = 1;
761 }
762
763 if (!fl.oif)
764 fl.oif = sk->sk_bound_dev_if;
765
766 if (msg->msg_controllen) {
767 opt = &opt_space;
768 memset(opt, 0, sizeof(struct ipv6_txoptions));
769 opt->tot_len = sizeof(*opt);
770
771 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
772 if (err < 0) {
773 fl6_sock_release(flowlabel);
774 return err;
775 }
776 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
777 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
778 if (flowlabel == NULL)
779 return -EINVAL;
780 }
781 if (!(opt->opt_nflen|opt->opt_flen))
782 opt = NULL;
783 connected = 0;
784 }
785 if (opt == NULL)
786 opt = np->opt;
787 if (flowlabel)
788 opt = fl6_merge_options(&opt_space, flowlabel, opt);
789 opt = ipv6_fixup_options(&opt_space, opt);
790
791 fl.proto = sk->sk_protocol;
792 if (!ipv6_addr_any(daddr))
793 ipv6_addr_copy(&fl.fl6_dst, daddr);
794 else
795 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
796 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
797 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
798 fl.fl_ip_sport = inet->sport;
799
800 /* merge ip6_build_xmit from ip6_output */
801 if (opt && opt->srcrt) {
802 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
803 ipv6_addr_copy(&final, &fl.fl6_dst);
804 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
805 final_p = &final;
806 connected = 0;
807 }
808
809 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
810 fl.oif = np->mcast_oif;
811 connected = 0;
812 }
813
814 security_sk_classify_flow(sk, &fl);
815
816 err = ip6_sk_dst_lookup(sk, &dst, &fl);
817 if (err)
818 goto out;
819 if (final_p)
820 ipv6_addr_copy(&fl.fl6_dst, final_p);
821
822 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
823 if (err == -EREMOTE)
824 err = ip6_dst_blackhole(sk, &dst, &fl);
825 if (err < 0)
826 goto out;
827 }
828
829 if (hlimit < 0) {
830 if (ipv6_addr_is_multicast(&fl.fl6_dst))
831 hlimit = np->mcast_hops;
832 else
833 hlimit = np->hop_limit;
834 if (hlimit < 0)
835 hlimit = ip6_dst_hoplimit(dst);
836 }
837
838 if (tclass < 0) {
839 tclass = np->tclass;
840 if (tclass < 0)
841 tclass = 0;
842 }
843
844 if (msg->msg_flags&MSG_CONFIRM)
845 goto do_confirm;
846 back_from_confirm:
847
848 lock_sock(sk);
849 if (unlikely(up->pending)) {
850 /* The socket is already corked while preparing it. */
851 /* ... which is an evident application bug. --ANK */
852 release_sock(sk);
853
854 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
855 err = -EINVAL;
856 goto out;
857 }
858
859 up->pending = AF_INET6;
860
861 do_append_data:
862 up->len += ulen;
863 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
864 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
865 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
866 (struct rt6_info*)dst,
867 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
868 if (err)
869 udp_v6_flush_pending_frames(sk);
870 else if (!corkreq)
871 err = udp_v6_push_pending_frames(sk);
872 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
873 up->pending = 0;
874
875 if (dst) {
876 if (connected) {
877 ip6_dst_store(sk, dst,
878 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
879 &np->daddr : NULL,
880 #ifdef CONFIG_IPV6_SUBTREES
881 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
882 &np->saddr :
883 #endif
884 NULL);
885 } else {
886 dst_release(dst);
887 }
888 dst = NULL;
889 }
890
891 if (err > 0)
892 err = np->recverr ? net_xmit_errno(err) : 0;
893 release_sock(sk);
894 out:
895 dst_release(dst);
896 fl6_sock_release(flowlabel);
897 if (!err)
898 return len;
899 /*
900 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
901 * ENOBUFS might not be good (it's not tunable per se), but otherwise
902 * we don't have a good statistic (IpOutDiscards but it can be too many
903 * things). We could add another new stat but at least for now that
904 * seems like overkill.
905 */
906 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
907 UDP6_INC_STATS_USER(sock_net(sk),
908 UDP_MIB_SNDBUFERRORS, is_udplite);
909 }
910 return err;
911
912 do_confirm:
913 dst_confirm(dst);
914 if (!(msg->msg_flags&MSG_PROBE) || len)
915 goto back_from_confirm;
916 err = 0;
917 goto out;
918 }
919
920 void udpv6_destroy_sock(struct sock *sk)
921 {
922 lock_sock(sk);
923 udp_v6_flush_pending_frames(sk);
924 release_sock(sk);
925
926 inet6_destroy_sock(sk);
927 }
928
929 /*
930 * Socket option code for UDP
931 */
932 int udpv6_setsockopt(struct sock *sk, int level, int optname,
933 char __user *optval, int optlen)
934 {
935 if (level == SOL_UDP || level == SOL_UDPLITE)
936 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
937 udp_v6_push_pending_frames);
938 return ipv6_setsockopt(sk, level, optname, optval, optlen);
939 }
940
941 #ifdef CONFIG_COMPAT
942 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
943 char __user *optval, int optlen)
944 {
945 if (level == SOL_UDP || level == SOL_UDPLITE)
946 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
947 udp_v6_push_pending_frames);
948 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
949 }
950 #endif
951
952 int udpv6_getsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, int __user *optlen)
954 {
955 if (level == SOL_UDP || level == SOL_UDPLITE)
956 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
957 return ipv6_getsockopt(sk, level, optname, optval, optlen);
958 }
959
960 #ifdef CONFIG_COMPAT
961 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
962 char __user *optval, int __user *optlen)
963 {
964 if (level == SOL_UDP || level == SOL_UDPLITE)
965 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
966 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
967 }
968 #endif
969
970 static struct inet6_protocol udpv6_protocol = {
971 .handler = udpv6_rcv,
972 .err_handler = udpv6_err,
973 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
974 };
975
976 /* ------------------------------------------------------------------------ */
977 #ifdef CONFIG_PROC_FS
978
979 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
980 {
981 struct inet_sock *inet = inet_sk(sp);
982 struct ipv6_pinfo *np = inet6_sk(sp);
983 struct in6_addr *dest, *src;
984 __u16 destp, srcp;
985
986 dest = &np->daddr;
987 src = &np->rcv_saddr;
988 destp = ntohs(inet->dport);
989 srcp = ntohs(inet->sport);
990 seq_printf(seq,
991 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
992 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
993 bucket,
994 src->s6_addr32[0], src->s6_addr32[1],
995 src->s6_addr32[2], src->s6_addr32[3], srcp,
996 dest->s6_addr32[0], dest->s6_addr32[1],
997 dest->s6_addr32[2], dest->s6_addr32[3], destp,
998 sp->sk_state,
999 atomic_read(&sp->sk_wmem_alloc),
1000 atomic_read(&sp->sk_rmem_alloc),
1001 0, 0L, 0,
1002 sock_i_uid(sp), 0,
1003 sock_i_ino(sp),
1004 atomic_read(&sp->sk_refcnt), sp,
1005 atomic_read(&sp->sk_drops));
1006 }
1007
1008 int udp6_seq_show(struct seq_file *seq, void *v)
1009 {
1010 if (v == SEQ_START_TOKEN)
1011 seq_printf(seq,
1012 " sl "
1013 "local_address "
1014 "remote_address "
1015 "st tx_queue rx_queue tr tm->when retrnsmt"
1016 " uid timeout inode ref pointer drops\n");
1017 else
1018 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1019 return 0;
1020 }
1021
1022 static struct udp_seq_afinfo udp6_seq_afinfo = {
1023 .name = "udp6",
1024 .family = AF_INET6,
1025 .hashtable = udp_hash,
1026 .seq_fops = {
1027 .owner = THIS_MODULE,
1028 },
1029 .seq_ops = {
1030 .show = udp6_seq_show,
1031 },
1032 };
1033
1034 int udp6_proc_init(struct net *net)
1035 {
1036 return udp_proc_register(net, &udp6_seq_afinfo);
1037 }
1038
1039 void udp6_proc_exit(struct net *net) {
1040 udp_proc_unregister(net, &udp6_seq_afinfo);
1041 }
1042 #endif /* CONFIG_PROC_FS */
1043
1044 /* ------------------------------------------------------------------------ */
1045
1046 struct proto udpv6_prot = {
1047 .name = "UDPv6",
1048 .owner = THIS_MODULE,
1049 .close = udp_lib_close,
1050 .connect = ip6_datagram_connect,
1051 .disconnect = udp_disconnect,
1052 .ioctl = udp_ioctl,
1053 .destroy = udpv6_destroy_sock,
1054 .setsockopt = udpv6_setsockopt,
1055 .getsockopt = udpv6_getsockopt,
1056 .sendmsg = udpv6_sendmsg,
1057 .recvmsg = udpv6_recvmsg,
1058 .backlog_rcv = udpv6_queue_rcv_skb,
1059 .hash = udp_lib_hash,
1060 .unhash = udp_lib_unhash,
1061 .get_port = udp_v6_get_port,
1062 .memory_allocated = &udp_memory_allocated,
1063 .sysctl_mem = sysctl_udp_mem,
1064 .sysctl_wmem = &sysctl_udp_wmem_min,
1065 .sysctl_rmem = &sysctl_udp_rmem_min,
1066 .obj_size = sizeof(struct udp6_sock),
1067 .h.udp_hash = udp_hash,
1068 #ifdef CONFIG_COMPAT
1069 .compat_setsockopt = compat_udpv6_setsockopt,
1070 .compat_getsockopt = compat_udpv6_getsockopt,
1071 #endif
1072 };
1073
1074 static struct inet_protosw udpv6_protosw = {
1075 .type = SOCK_DGRAM,
1076 .protocol = IPPROTO_UDP,
1077 .prot = &udpv6_prot,
1078 .ops = &inet6_dgram_ops,
1079 .capability =-1,
1080 .no_check = UDP_CSUM_DEFAULT,
1081 .flags = INET_PROTOSW_PERMANENT,
1082 };
1083
1084
1085 int __init udpv6_init(void)
1086 {
1087 int ret;
1088
1089 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1090 if (ret)
1091 goto out;
1092
1093 ret = inet6_register_protosw(&udpv6_protosw);
1094 if (ret)
1095 goto out_udpv6_protocol;
1096 out:
1097 return ret;
1098
1099 out_udpv6_protocol:
1100 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1101 goto out;
1102 }
1103
1104 void udpv6_exit(void)
1105 {
1106 inet6_unregister_protosw(&udpv6_protosw);
1107 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1108 }
Support for the Chinese Samsung S3C2440 based development boards