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net: Discard and warn about LRO'd skbs received for forwarding
[linux-2.6/verdex.git] / net / ipv6 / udp.c
blobf91e1df0d25e25d9ab48f9334f7f0faacbde688f
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(UDP_MIB_INDATAGRAMS, is_udplite);
170
171 sock_recv_timestamp(msg, sk, skb);
172
173 /* Copy the address. */
174 if (msg->msg_name) {
175 struct sockaddr_in6 *sin6;
176
177 sin6 = (struct sockaddr_in6 *) msg->msg_name;
178 sin6->sin6_family = AF_INET6;
179 sin6->sin6_port = udp_hdr(skb)->source;
180 sin6->sin6_flowinfo = 0;
181 sin6->sin6_scope_id = 0;
182
183 if (skb->protocol == htons(ETH_P_IP))
184 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
185 htonl(0xffff), ip_hdr(skb)->saddr);
186 else {
187 ipv6_addr_copy(&sin6->sin6_addr,
188 &ipv6_hdr(skb)->saddr);
189 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
190 sin6->sin6_scope_id = IP6CB(skb)->iif;
191 }
192
193 }
194 if (skb->protocol == htons(ETH_P_IP)) {
195 if (inet->cmsg_flags)
196 ip_cmsg_recv(msg, skb);
197 } else {
198 if (np->rxopt.all)
199 datagram_recv_ctl(sk, msg, skb);
200 }
201
202 err = copied;
203 if (flags & MSG_TRUNC)
204 err = ulen;
205
206 out_free:
207 lock_sock(sk);
208 skb_free_datagram(sk, skb);
209 release_sock(sk);
210 out:
211 return err;
212
213 csum_copy_err:
214 lock_sock(sk);
215 if (!skb_kill_datagram(sk, skb, flags))
216 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
217 release_sock(sk);
218
219 if (flags & MSG_DONTWAIT)
220 return -EAGAIN;
221 goto try_again;
222 }
223
224 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
225 int type, int code, int offset, __be32 info,
226 struct hlist_head udptable[] )
227 {
228 struct ipv6_pinfo *np;
229 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
230 struct in6_addr *saddr = &hdr->saddr;
231 struct in6_addr *daddr = &hdr->daddr;
232 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
233 struct sock *sk;
234 int err;
235
236 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
237 saddr, uh->source, inet6_iif(skb), udptable);
238 if (sk == NULL)
239 return;
240
241 np = inet6_sk(sk);
242
243 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
244 goto out;
245
246 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
247 goto out;
248
249 if (np->recverr)
250 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
251
252 sk->sk_err = err;
253 sk->sk_error_report(sk);
254 out:
255 sock_put(sk);
256 }
257
258 static __inline__ void udpv6_err(struct sk_buff *skb,
259 struct inet6_skb_parm *opt, int type,
260 int code, int offset, __be32 info )
261 {
262 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
263 }
264
265 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
266 {
267 struct udp_sock *up = udp_sk(sk);
268 int rc;
269 int is_udplite = IS_UDPLITE(sk);
270
271 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
272 goto drop;
273
274 /*
275 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
276 */
277 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
278
279 if (up->pcrlen == 0) { /* full coverage was set */
280 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
281 " %d while full coverage %d requested\n",
282 UDP_SKB_CB(skb)->cscov, skb->len);
283 goto drop;
284 }
285 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
286 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
287 "too small, need min %d\n",
288 UDP_SKB_CB(skb)->cscov, up->pcrlen);
289 goto drop;
290 }
291 }
292
293 if (sk->sk_filter) {
294 if (udp_lib_checksum_complete(skb))
295 goto drop;
296 }
297
298 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
299 /* Note that an ENOMEM error is charged twice */
300 if (rc == -ENOMEM) {
301 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
302 atomic_inc(&sk->sk_drops);
303 }
304 goto drop;
305 }
306
307 return 0;
308 drop:
309 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
310 kfree_skb(skb);
311 return -1;
312 }
313
314 static struct sock *udp_v6_mcast_next(struct sock *sk,
315 __be16 loc_port, struct in6_addr *loc_addr,
316 __be16 rmt_port, struct in6_addr *rmt_addr,
317 int dif)
318 {
319 struct hlist_node *node;
320 struct sock *s = sk;
321 unsigned short num = ntohs(loc_port);
322
323 sk_for_each_from(s, node) {
324 struct inet_sock *inet = inet_sk(s);
325
326 if (sock_net(s) != sock_net(sk))
327 continue;
328
329 if (s->sk_hash == num && s->sk_family == PF_INET6) {
330 struct ipv6_pinfo *np = inet6_sk(s);
331 if (inet->dport) {
332 if (inet->dport != rmt_port)
333 continue;
334 }
335 if (!ipv6_addr_any(&np->daddr) &&
336 !ipv6_addr_equal(&np->daddr, rmt_addr))
337 continue;
338
339 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
340 continue;
341
342 if (!ipv6_addr_any(&np->rcv_saddr)) {
343 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
344 continue;
345 }
346 if (!inet6_mc_check(s, loc_addr, rmt_addr))
347 continue;
348 return s;
349 }
350 }
351 return NULL;
352 }
353
354 /*
355 * Note: called only from the BH handler context,
356 * so we don't need to lock the hashes.
357 */
358 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
359 struct in6_addr *saddr, struct in6_addr *daddr,
360 struct hlist_head udptable[])
361 {
362 struct sock *sk, *sk2;
363 const struct udphdr *uh = udp_hdr(skb);
364 int dif;
365
366 read_lock(&udp_hash_lock);
367 sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]);
368 dif = inet6_iif(skb);
369 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
370 if (!sk) {
371 kfree_skb(skb);
372 goto out;
373 }
374
375 sk2 = sk;
376 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
377 uh->source, saddr, dif))) {
378 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
379 if (buff) {
380 bh_lock_sock_nested(sk2);
381 if (!sock_owned_by_user(sk2))
382 udpv6_queue_rcv_skb(sk2, buff);
383 else
384 sk_add_backlog(sk2, buff);
385 bh_unlock_sock(sk2);
386 }
387 }
388 bh_lock_sock_nested(sk);
389 if (!sock_owned_by_user(sk))
390 udpv6_queue_rcv_skb(sk, skb);
391 else
392 sk_add_backlog(sk, skb);
393 bh_unlock_sock(sk);
394 out:
395 read_unlock(&udp_hash_lock);
396 return 0;
397 }
398
399 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
400 int proto)
401 {
402 int err;
403
404 UDP_SKB_CB(skb)->partial_cov = 0;
405 UDP_SKB_CB(skb)->cscov = skb->len;
406
407 if (proto == IPPROTO_UDPLITE) {
408 err = udplite_checksum_init(skb, uh);
409 if (err)
410 return err;
411 }
412
413 if (uh->check == 0) {
414 /* RFC 2460 section 8.1 says that we SHOULD log
415 this error. Well, it is reasonable.
416 */
417 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
418 return 1;
419 }
420 if (skb->ip_summed == CHECKSUM_COMPLETE &&
421 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
422 skb->len, proto, skb->csum))
423 skb->ip_summed = CHECKSUM_UNNECESSARY;
424
425 if (!skb_csum_unnecessary(skb))
426 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
427 &ipv6_hdr(skb)->daddr,
428 skb->len, proto, 0));
429
430 return 0;
431 }
432
433 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
434 int proto)
435 {
436 struct sock *sk;
437 struct udphdr *uh;
438 struct net_device *dev = skb->dev;
439 struct in6_addr *saddr, *daddr;
440 u32 ulen = 0;
441 struct net *net;
442
443 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
444 goto short_packet;
445
446 saddr = &ipv6_hdr(skb)->saddr;
447 daddr = &ipv6_hdr(skb)->daddr;
448 uh = udp_hdr(skb);
449
450 ulen = ntohs(uh->len);
451 if (ulen > skb->len)
452 goto short_packet;
453
454 if (proto == IPPROTO_UDP) {
455 /* UDP validates ulen. */
456
457 /* Check for jumbo payload */
458 if (ulen == 0)
459 ulen = skb->len;
460
461 if (ulen < sizeof(*uh))
462 goto short_packet;
463
464 if (ulen < skb->len) {
465 if (pskb_trim_rcsum(skb, ulen))
466 goto short_packet;
467 saddr = &ipv6_hdr(skb)->saddr;
468 daddr = &ipv6_hdr(skb)->daddr;
469 uh = udp_hdr(skb);
470 }
471 }
472
473 if (udp6_csum_init(skb, uh, proto))
474 goto discard;
475
476 net = dev_net(skb->dev);
477 /*
478 * Multicast receive code
479 */
480 if (ipv6_addr_is_multicast(daddr))
481 return __udp6_lib_mcast_deliver(net, skb,
482 saddr, daddr, udptable);
483
484 /* Unicast */
485
486 /*
487 * check socket cache ... must talk to Alan about his plans
488 * for sock caches... i'll skip this for now.
489 */
490 sk = __udp6_lib_lookup(net, saddr, uh->source,
491 daddr, uh->dest, inet6_iif(skb), udptable);
492
493 if (sk == NULL) {
494 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
495 goto discard;
496
497 if (udp_lib_checksum_complete(skb))
498 goto discard;
499 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
500
501 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
502
503 kfree_skb(skb);
504 return 0;
505 }
506
507 /* deliver */
508
509 bh_lock_sock_nested(sk);
510 if (!sock_owned_by_user(sk))
511 udpv6_queue_rcv_skb(sk, skb);
512 else
513 sk_add_backlog(sk, skb);
514 bh_unlock_sock(sk);
515 sock_put(sk);
516 return 0;
517
518 short_packet:
519 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
520 proto == IPPROTO_UDPLITE ? "-Lite" : "",
521 ulen, skb->len);
522
523 discard:
524 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
525 kfree_skb(skb);
526 return 0;
527 }
528
529 static __inline__ int udpv6_rcv(struct sk_buff *skb)
530 {
531 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
532 }
533
534 /*
535 * Throw away all pending data and cancel the corking. Socket is locked.
536 */
537 static void udp_v6_flush_pending_frames(struct sock *sk)
538 {
539 struct udp_sock *up = udp_sk(sk);
540
541 if (up->pending == AF_INET)
542 udp_flush_pending_frames(sk);
543 else if (up->pending) {
544 up->len = 0;
545 up->pending = 0;
546 ip6_flush_pending_frames(sk);
547 }
548 }
549
550 /*
551 * Sending
552 */
553
554 static int udp_v6_push_pending_frames(struct sock *sk)
555 {
556 struct sk_buff *skb;
557 struct udphdr *uh;
558 struct udp_sock *up = udp_sk(sk);
559 struct inet_sock *inet = inet_sk(sk);
560 struct flowi *fl = &inet->cork.fl;
561 int err = 0;
562 int is_udplite = IS_UDPLITE(sk);
563 __wsum csum = 0;
564
565 /* Grab the skbuff where UDP header space exists. */
566 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
567 goto out;
568
569 /*
570 * Create a UDP header
571 */
572 uh = udp_hdr(skb);
573 uh->source = fl->fl_ip_sport;
574 uh->dest = fl->fl_ip_dport;
575 uh->len = htons(up->len);
576 uh->check = 0;
577
578 if (is_udplite)
579 csum = udplite_csum_outgoing(sk, skb);
580 else
581 csum = udp_csum_outgoing(sk, skb);
582
583 /* add protocol-dependent pseudo-header */
584 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
585 up->len, fl->proto, csum );
586 if (uh->check == 0)
587 uh->check = CSUM_MANGLED_0;
588
589 err = ip6_push_pending_frames(sk);
590 out:
591 up->len = 0;
592 up->pending = 0;
593 if (!err)
594 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
595 return err;
596 }
597
598 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
599 struct msghdr *msg, size_t len)
600 {
601 struct ipv6_txoptions opt_space;
602 struct udp_sock *up = udp_sk(sk);
603 struct inet_sock *inet = inet_sk(sk);
604 struct ipv6_pinfo *np = inet6_sk(sk);
605 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
606 struct in6_addr *daddr, *final_p = NULL, final;
607 struct ipv6_txoptions *opt = NULL;
608 struct ip6_flowlabel *flowlabel = NULL;
609 struct flowi fl;
610 struct dst_entry *dst;
611 int addr_len = msg->msg_namelen;
612 int ulen = len;
613 int hlimit = -1;
614 int tclass = -1;
615 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
616 int err;
617 int connected = 0;
618 int is_udplite = IS_UDPLITE(sk);
619 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
620
621 /* destination address check */
622 if (sin6) {
623 if (addr_len < offsetof(struct sockaddr, sa_data))
624 return -EINVAL;
625
626 switch (sin6->sin6_family) {
627 case AF_INET6:
628 if (addr_len < SIN6_LEN_RFC2133)
629 return -EINVAL;
630 daddr = &sin6->sin6_addr;
631 break;
632 case AF_INET:
633 goto do_udp_sendmsg;
634 case AF_UNSPEC:
635 msg->msg_name = sin6 = NULL;
636 msg->msg_namelen = addr_len = 0;
637 daddr = NULL;
638 break;
639 default:
640 return -EINVAL;
641 }
642 } else if (!up->pending) {
643 if (sk->sk_state != TCP_ESTABLISHED)
644 return -EDESTADDRREQ;
645 daddr = &np->daddr;
646 } else
647 daddr = NULL;
648
649 if (daddr) {
650 if (ipv6_addr_v4mapped(daddr)) {
651 struct sockaddr_in sin;
652 sin.sin_family = AF_INET;
653 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
654 sin.sin_addr.s_addr = daddr->s6_addr32[3];
655 msg->msg_name = &sin;
656 msg->msg_namelen = sizeof(sin);
657 do_udp_sendmsg:
658 if (__ipv6_only_sock(sk))
659 return -ENETUNREACH;
660 return udp_sendmsg(iocb, sk, msg, len);
661 }
662 }
663
664 if (up->pending == AF_INET)
665 return udp_sendmsg(iocb, sk, msg, len);
666
667 /* Rough check on arithmetic overflow,
668 better check is made in ip6_append_data().
669 */
670 if (len > INT_MAX - sizeof(struct udphdr))
671 return -EMSGSIZE;
672
673 if (up->pending) {
674 /*
675 * There are pending frames.
676 * The socket lock must be held while it's corked.
677 */
678 lock_sock(sk);
679 if (likely(up->pending)) {
680 if (unlikely(up->pending != AF_INET6)) {
681 release_sock(sk);
682 return -EAFNOSUPPORT;
683 }
684 dst = NULL;
685 goto do_append_data;
686 }
687 release_sock(sk);
688 }
689 ulen += sizeof(struct udphdr);
690
691 memset(&fl, 0, sizeof(fl));
692
693 if (sin6) {
694 if (sin6->sin6_port == 0)
695 return -EINVAL;
696
697 fl.fl_ip_dport = sin6->sin6_port;
698 daddr = &sin6->sin6_addr;
699
700 if (np->sndflow) {
701 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
702 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
703 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
704 if (flowlabel == NULL)
705 return -EINVAL;
706 daddr = &flowlabel->dst;
707 }
708 }
709
710 /*
711 * Otherwise it will be difficult to maintain
712 * sk->sk_dst_cache.
713 */
714 if (sk->sk_state == TCP_ESTABLISHED &&
715 ipv6_addr_equal(daddr, &np->daddr))
716 daddr = &np->daddr;
717
718 if (addr_len >= sizeof(struct sockaddr_in6) &&
719 sin6->sin6_scope_id &&
720 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
721 fl.oif = sin6->sin6_scope_id;
722 } else {
723 if (sk->sk_state != TCP_ESTABLISHED)
724 return -EDESTADDRREQ;
725
726 fl.fl_ip_dport = inet->dport;
727 daddr = &np->daddr;
728 fl.fl6_flowlabel = np->flow_label;
729 connected = 1;
730 }
731
732 if (!fl.oif)
733 fl.oif = sk->sk_bound_dev_if;
734
735 if (msg->msg_controllen) {
736 opt = &opt_space;
737 memset(opt, 0, sizeof(struct ipv6_txoptions));
738 opt->tot_len = sizeof(*opt);
739
740 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
741 if (err < 0) {
742 fl6_sock_release(flowlabel);
743 return err;
744 }
745 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
746 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
747 if (flowlabel == NULL)
748 return -EINVAL;
749 }
750 if (!(opt->opt_nflen|opt->opt_flen))
751 opt = NULL;
752 connected = 0;
753 }
754 if (opt == NULL)
755 opt = np->opt;
756 if (flowlabel)
757 opt = fl6_merge_options(&opt_space, flowlabel, opt);
758 opt = ipv6_fixup_options(&opt_space, opt);
759
760 fl.proto = sk->sk_protocol;
761 if (!ipv6_addr_any(daddr))
762 ipv6_addr_copy(&fl.fl6_dst, daddr);
763 else
764 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
765 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
766 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
767 fl.fl_ip_sport = inet->sport;
768
769 /* merge ip6_build_xmit from ip6_output */
770 if (opt && opt->srcrt) {
771 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
772 ipv6_addr_copy(&final, &fl.fl6_dst);
773 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
774 final_p = &final;
775 connected = 0;
776 }
777
778 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
779 fl.oif = np->mcast_oif;
780 connected = 0;
781 }
782
783 security_sk_classify_flow(sk, &fl);
784
785 err = ip6_sk_dst_lookup(sk, &dst, &fl);
786 if (err)
787 goto out;
788 if (final_p)
789 ipv6_addr_copy(&fl.fl6_dst, final_p);
790
791 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
792 if (err == -EREMOTE)
793 err = ip6_dst_blackhole(sk, &dst, &fl);
794 if (err < 0)
795 goto out;
796 }
797
798 if (hlimit < 0) {
799 if (ipv6_addr_is_multicast(&fl.fl6_dst))
800 hlimit = np->mcast_hops;
801 else
802 hlimit = np->hop_limit;
803 if (hlimit < 0)
804 hlimit = ip6_dst_hoplimit(dst);
805 }
806
807 if (tclass < 0) {
808 tclass = np->tclass;
809 if (tclass < 0)
810 tclass = 0;
811 }
812
813 if (msg->msg_flags&MSG_CONFIRM)
814 goto do_confirm;
815 back_from_confirm:
816
817 lock_sock(sk);
818 if (unlikely(up->pending)) {
819 /* The socket is already corked while preparing it. */
820 /* ... which is an evident application bug. --ANK */
821 release_sock(sk);
822
823 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
824 err = -EINVAL;
825 goto out;
826 }
827
828 up->pending = AF_INET6;
829
830 do_append_data:
831 up->len += ulen;
832 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
833 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
834 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
835 (struct rt6_info*)dst,
836 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
837 if (err)
838 udp_v6_flush_pending_frames(sk);
839 else if (!corkreq)
840 err = udp_v6_push_pending_frames(sk);
841 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
842 up->pending = 0;
843
844 if (dst) {
845 if (connected) {
846 ip6_dst_store(sk, dst,
847 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
848 &np->daddr : NULL,
849 #ifdef CONFIG_IPV6_SUBTREES
850 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
851 &np->saddr :
852 #endif
853 NULL);
854 } else {
855 dst_release(dst);
856 }
857 dst = NULL;
858 }
859
860 if (err > 0)
861 err = np->recverr ? net_xmit_errno(err) : 0;
862 release_sock(sk);
863 out:
864 dst_release(dst);
865 fl6_sock_release(flowlabel);
866 if (!err)
867 return len;
868 /*
869 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
870 * ENOBUFS might not be good (it's not tunable per se), but otherwise
871 * we don't have a good statistic (IpOutDiscards but it can be too many
872 * things). We could add another new stat but at least for now that
873 * seems like overkill.
874 */
875 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
876 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
877 }
878 return err;
879
880 do_confirm:
881 dst_confirm(dst);
882 if (!(msg->msg_flags&MSG_PROBE) || len)
883 goto back_from_confirm;
884 err = 0;
885 goto out;
886 }
887
888 void udpv6_destroy_sock(struct sock *sk)
889 {
890 lock_sock(sk);
891 udp_v6_flush_pending_frames(sk);
892 release_sock(sk);
893
894 inet6_destroy_sock(sk);
895 }
896
897 /*
898 * Socket option code for UDP
899 */
900 int udpv6_setsockopt(struct sock *sk, int level, int optname,
901 char __user *optval, int optlen)
902 {
903 if (level == SOL_UDP || level == SOL_UDPLITE)
904 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
905 udp_v6_push_pending_frames);
906 return ipv6_setsockopt(sk, level, optname, optval, optlen);
907 }
908
909 #ifdef CONFIG_COMPAT
910 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
911 char __user *optval, int optlen)
912 {
913 if (level == SOL_UDP || level == SOL_UDPLITE)
914 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
915 udp_v6_push_pending_frames);
916 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
917 }
918 #endif
919
920 int udpv6_getsockopt(struct sock *sk, int level, int optname,
921 char __user *optval, int __user *optlen)
922 {
923 if (level == SOL_UDP || level == SOL_UDPLITE)
924 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
925 return ipv6_getsockopt(sk, level, optname, optval, optlen);
926 }
927
928 #ifdef CONFIG_COMPAT
929 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
930 char __user *optval, int __user *optlen)
931 {
932 if (level == SOL_UDP || level == SOL_UDPLITE)
933 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
934 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
935 }
936 #endif
937
938 static struct inet6_protocol udpv6_protocol = {
939 .handler = udpv6_rcv,
940 .err_handler = udpv6_err,
941 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
942 };
943
944 /* ------------------------------------------------------------------------ */
945 #ifdef CONFIG_PROC_FS
946
947 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
948 {
949 struct inet_sock *inet = inet_sk(sp);
950 struct ipv6_pinfo *np = inet6_sk(sp);
951 struct in6_addr *dest, *src;
952 __u16 destp, srcp;
953
954 dest = &np->daddr;
955 src = &np->rcv_saddr;
956 destp = ntohs(inet->dport);
957 srcp = ntohs(inet->sport);
958 seq_printf(seq,
959 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
960 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
961 bucket,
962 src->s6_addr32[0], src->s6_addr32[1],
963 src->s6_addr32[2], src->s6_addr32[3], srcp,
964 dest->s6_addr32[0], dest->s6_addr32[1],
965 dest->s6_addr32[2], dest->s6_addr32[3], destp,
966 sp->sk_state,
967 atomic_read(&sp->sk_wmem_alloc),
968 atomic_read(&sp->sk_rmem_alloc),
969 0, 0L, 0,
970 sock_i_uid(sp), 0,
971 sock_i_ino(sp),
972 atomic_read(&sp->sk_refcnt), sp,
973 atomic_read(&sp->sk_drops));
974 }
975
976 int udp6_seq_show(struct seq_file *seq, void *v)
977 {
978 if (v == SEQ_START_TOKEN)
979 seq_printf(seq,
980 " sl "
981 "local_address "
982 "remote_address "
983 "st tx_queue rx_queue tr tm->when retrnsmt"
984 " uid timeout inode ref pointer drops\n");
985 else
986 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
987 return 0;
988 }
989
990 static struct udp_seq_afinfo udp6_seq_afinfo = {
991 .name = "udp6",
992 .family = AF_INET6,
993 .hashtable = udp_hash,
994 .seq_fops = {
995 .owner = THIS_MODULE,
996 },
997 .seq_ops = {
998 .show = udp6_seq_show,
999 },
1000 };
1001
1002 int udp6_proc_init(struct net *net)
1003 {
1004 return udp_proc_register(net, &udp6_seq_afinfo);
1005 }
1006
1007 void udp6_proc_exit(struct net *net) {
1008 udp_proc_unregister(net, &udp6_seq_afinfo);
1009 }
1010 #endif /* CONFIG_PROC_FS */
1011
1012 /* ------------------------------------------------------------------------ */
1013
1014 struct proto udpv6_prot = {
1015 .name = "UDPv6",
1016 .owner = THIS_MODULE,
1017 .close = udp_lib_close,
1018 .connect = ip6_datagram_connect,
1019 .disconnect = udp_disconnect,
1020 .ioctl = udp_ioctl,
1021 .destroy = udpv6_destroy_sock,
1022 .setsockopt = udpv6_setsockopt,
1023 .getsockopt = udpv6_getsockopt,
1024 .sendmsg = udpv6_sendmsg,
1025 .recvmsg = udpv6_recvmsg,
1026 .backlog_rcv = udpv6_queue_rcv_skb,
1027 .hash = udp_lib_hash,
1028 .unhash = udp_lib_unhash,
1029 .get_port = udp_v6_get_port,
1030 .memory_allocated = &udp_memory_allocated,
1031 .sysctl_mem = sysctl_udp_mem,
1032 .sysctl_wmem = &sysctl_udp_wmem_min,
1033 .sysctl_rmem = &sysctl_udp_rmem_min,
1034 .obj_size = sizeof(struct udp6_sock),
1035 .h.udp_hash = udp_hash,
1036 #ifdef CONFIG_COMPAT
1037 .compat_setsockopt = compat_udpv6_setsockopt,
1038 .compat_getsockopt = compat_udpv6_getsockopt,
1039 #endif
1040 };
1041
1042 static struct inet_protosw udpv6_protosw = {
1043 .type = SOCK_DGRAM,
1044 .protocol = IPPROTO_UDP,
1045 .prot = &udpv6_prot,
1046 .ops = &inet6_dgram_ops,
1047 .capability =-1,
1048 .no_check = UDP_CSUM_DEFAULT,
1049 .flags = INET_PROTOSW_PERMANENT,
1050 };
1051
1052
1053 int __init udpv6_init(void)
1054 {
1055 int ret;
1056
1057 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1058 if (ret)
1059 goto out;
1060
1061 ret = inet6_register_protosw(&udpv6_protosw);
1062 if (ret)
1063 goto out_udpv6_protocol;
1064 out:
1065 return ret;
1066
1067 out_udpv6_protocol:
1068 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1069 goto out;
1070 }
1071
1072 void udpv6_exit(void)
1073 {
1074 inet6_unregister_protosw(&udpv6_protosw);
1075 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1076 }
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