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