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[UDP]: Defer InDataGrams increment until recvmsg() does checksum
[linux-2.6/mini2440.git] / net / ipv6 / udp.c
blobb0474a618bbe6afd8024d19e3c5bf68d7b8ca6fe
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 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
11 *
12 * Fixes:
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
15 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
16 * a single port at the same time.
17 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/errno.h>
27 #include <linux/types.h>
28 #include <linux/socket.h>
29 #include <linux/sockios.h>
30 #include <linux/net.h>
31 #include <linux/in6.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/ipv6.h>
35 #include <linux/icmpv6.h>
36 #include <linux/init.h>
37 #include <linux/skbuff.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include "udp_impl.h"
52
53 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
54
55 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
56 {
57 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
58 }
59
60 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
61 struct in6_addr *daddr, __be16 dport,
62 int dif, struct hlist_head udptable[])
63 {
64 struct sock *sk, *result = NULL;
65 struct hlist_node *node;
66 unsigned short hnum = ntohs(dport);
67 int badness = -1;
68
69 read_lock(&udp_hash_lock);
70 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
71 struct inet_sock *inet = inet_sk(sk);
72
73 if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
74 struct ipv6_pinfo *np = inet6_sk(sk);
75 int score = 0;
76 if (inet->dport) {
77 if (inet->dport != sport)
78 continue;
79 score++;
80 }
81 if (!ipv6_addr_any(&np->rcv_saddr)) {
82 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
83 continue;
84 score++;
85 }
86 if (!ipv6_addr_any(&np->daddr)) {
87 if (!ipv6_addr_equal(&np->daddr, saddr))
88 continue;
89 score++;
90 }
91 if (sk->sk_bound_dev_if) {
92 if (sk->sk_bound_dev_if != dif)
93 continue;
94 score++;
95 }
96 if (score == 4) {
97 result = sk;
98 break;
99 } else if (score > badness) {
100 result = sk;
101 badness = score;
102 }
103 }
104 }
105 if (result)
106 sock_hold(result);
107 read_unlock(&udp_hash_lock);
108 return result;
109 }
110
111 /*
112 * This should be easy, if there is something there we
113 * return it, otherwise we block.
114 */
115
116 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
117 struct msghdr *msg, size_t len,
118 int noblock, int flags, int *addr_len)
119 {
120 struct ipv6_pinfo *np = inet6_sk(sk);
121 struct inet_sock *inet = inet_sk(sk);
122 struct sk_buff *skb;
123 unsigned int ulen, copied;
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, &err);
135 if (!skb)
136 goto out;
137
138 ulen = skb->len - sizeof(struct udphdr);
139 copied = len;
140 if (copied > ulen)
141 copied = ulen;
142 else if (copied < ulen)
143 msg->msg_flags |= MSG_TRUNC;
144
145 /*
146 * If checksum is needed at all, try to do it while copying the
147 * data. If the data is truncated, or if we only want a partial
148 * coverage checksum (UDP-Lite), do it before the copy.
149 */
150
151 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
152 if (udp_lib_checksum_complete(skb))
153 goto csum_copy_err;
154 }
155
156 if (skb_csum_unnecessary(skb))
157 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
158 msg->msg_iov, copied );
159 else {
160 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
161 if (err == -EINVAL)
162 goto csum_copy_err;
163 }
164 if (err)
165 goto out_free;
166
167 UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
168
169 sock_recv_timestamp(msg, sk, skb);
170
171 /* Copy the address. */
172 if (msg->msg_name) {
173 struct sockaddr_in6 *sin6;
174
175 sin6 = (struct sockaddr_in6 *) msg->msg_name;
176 sin6->sin6_family = AF_INET6;
177 sin6->sin6_port = udp_hdr(skb)->source;
178 sin6->sin6_flowinfo = 0;
179 sin6->sin6_scope_id = 0;
180
181 if (skb->protocol == htons(ETH_P_IP))
182 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
183 htonl(0xffff), ip_hdr(skb)->saddr);
184 else {
185 ipv6_addr_copy(&sin6->sin6_addr,
186 &ipv6_hdr(skb)->saddr);
187 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
188 sin6->sin6_scope_id = IP6CB(skb)->iif;
189 }
190
191 }
192 if (skb->protocol == htons(ETH_P_IP)) {
193 if (inet->cmsg_flags)
194 ip_cmsg_recv(msg, skb);
195 } else {
196 if (np->rxopt.all)
197 datagram_recv_ctl(sk, msg, skb);
198 }
199
200 err = copied;
201 if (flags & MSG_TRUNC)
202 err = ulen;
203
204 out_free:
205 skb_free_datagram(sk, skb);
206 out:
207 return err;
208
209 csum_copy_err:
210 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
211 skb_kill_datagram(sk, skb, flags);
212
213 if (flags & MSG_DONTWAIT)
214 return -EAGAIN;
215 goto try_again;
216 }
217
218 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
219 int type, int code, int offset, __be32 info,
220 struct hlist_head udptable[] )
221 {
222 struct ipv6_pinfo *np;
223 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
224 struct in6_addr *saddr = &hdr->saddr;
225 struct in6_addr *daddr = &hdr->daddr;
226 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
227 struct sock *sk;
228 int err;
229
230 sk = __udp6_lib_lookup(daddr, uh->dest,
231 saddr, uh->source, inet6_iif(skb), udptable);
232 if (sk == NULL)
233 return;
234
235 np = inet6_sk(sk);
236
237 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
238 goto out;
239
240 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
241 goto out;
242
243 if (np->recverr)
244 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
245
246 sk->sk_err = err;
247 sk->sk_error_report(sk);
248 out:
249 sock_put(sk);
250 }
251
252 static __inline__ void udpv6_err(struct sk_buff *skb,
253 struct inet6_skb_parm *opt, int type,
254 int code, int offset, __be32 info )
255 {
256 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
257 }
258
259 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
260 {
261 struct udp_sock *up = udp_sk(sk);
262 int rc;
263
264 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
265 goto drop;
266
267 /*
268 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
269 */
270 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
271
272 if (up->pcrlen == 0) { /* full coverage was set */
273 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
274 " %d while full coverage %d requested\n",
275 UDP_SKB_CB(skb)->cscov, skb->len);
276 goto drop;
277 }
278 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
279 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
280 "too small, need min %d\n",
281 UDP_SKB_CB(skb)->cscov, up->pcrlen);
282 goto drop;
283 }
284 }
285
286 if (sk->sk_filter) {
287 if (udp_lib_checksum_complete(skb))
288 goto drop;
289 }
290
291 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
292 /* Note that an ENOMEM error is charged twice */
293 if (rc == -ENOMEM)
294 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
295 goto drop;
296 }
297
298 return 0;
299 drop:
300 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
301 kfree_skb(skb);
302 return -1;
303 }
304
305 static struct sock *udp_v6_mcast_next(struct sock *sk,
306 __be16 loc_port, struct in6_addr *loc_addr,
307 __be16 rmt_port, struct in6_addr *rmt_addr,
308 int dif)
309 {
310 struct hlist_node *node;
311 struct sock *s = sk;
312 unsigned short num = ntohs(loc_port);
313
314 sk_for_each_from(s, node) {
315 struct inet_sock *inet = inet_sk(s);
316
317 if (s->sk_hash == num && s->sk_family == PF_INET6) {
318 struct ipv6_pinfo *np = inet6_sk(s);
319 if (inet->dport) {
320 if (inet->dport != rmt_port)
321 continue;
322 }
323 if (!ipv6_addr_any(&np->daddr) &&
324 !ipv6_addr_equal(&np->daddr, rmt_addr))
325 continue;
326
327 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
328 continue;
329
330 if (!ipv6_addr_any(&np->rcv_saddr)) {
331 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
332 continue;
333 }
334 if (!inet6_mc_check(s, loc_addr, rmt_addr))
335 continue;
336 return s;
337 }
338 }
339 return NULL;
340 }
341
342 /*
343 * Note: called only from the BH handler context,
344 * so we don't need to lock the hashes.
345 */
346 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
347 struct in6_addr *daddr, struct hlist_head udptable[])
348 {
349 struct sock *sk, *sk2;
350 const struct udphdr *uh = udp_hdr(skb);
351 int dif;
352
353 read_lock(&udp_hash_lock);
354 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
355 dif = inet6_iif(skb);
356 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
357 if (!sk) {
358 kfree_skb(skb);
359 goto out;
360 }
361
362 sk2 = sk;
363 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
364 uh->source, saddr, dif))) {
365 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
366 if (buff)
367 udpv6_queue_rcv_skb(sk2, buff);
368 }
369 udpv6_queue_rcv_skb(sk, skb);
370 out:
371 read_unlock(&udp_hash_lock);
372 return 0;
373 }
374
375 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
376 int proto)
377 {
378 int err;
379
380 UDP_SKB_CB(skb)->partial_cov = 0;
381 UDP_SKB_CB(skb)->cscov = skb->len;
382
383 if (proto == IPPROTO_UDPLITE) {
384 err = udplite_checksum_init(skb, uh);
385 if (err)
386 return err;
387 }
388
389 if (uh->check == 0) {
390 /* RFC 2460 section 8.1 says that we SHOULD log
391 this error. Well, it is reasonable.
392 */
393 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
394 return 1;
395 }
396 if (skb->ip_summed == CHECKSUM_COMPLETE &&
397 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
398 skb->len, proto, skb->csum))
399 skb->ip_summed = CHECKSUM_UNNECESSARY;
400
401 if (!skb_csum_unnecessary(skb))
402 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
403 &ipv6_hdr(skb)->daddr,
404 skb->len, proto, 0));
405
406 return 0;
407 }
408
409 int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
410 int proto)
411 {
412 struct sock *sk;
413 struct udphdr *uh;
414 struct net_device *dev = skb->dev;
415 struct in6_addr *saddr, *daddr;
416 u32 ulen = 0;
417
418 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
419 goto short_packet;
420
421 saddr = &ipv6_hdr(skb)->saddr;
422 daddr = &ipv6_hdr(skb)->daddr;
423 uh = udp_hdr(skb);
424
425 ulen = ntohs(uh->len);
426 if (ulen > skb->len)
427 goto short_packet;
428
429 if (proto == IPPROTO_UDP) {
430 /* UDP validates ulen. */
431
432 /* Check for jumbo payload */
433 if (ulen == 0)
434 ulen = skb->len;
435
436 if (ulen < sizeof(*uh))
437 goto short_packet;
438
439 if (ulen < skb->len) {
440 if (pskb_trim_rcsum(skb, ulen))
441 goto short_packet;
442 saddr = &ipv6_hdr(skb)->saddr;
443 daddr = &ipv6_hdr(skb)->daddr;
444 uh = udp_hdr(skb);
445 }
446 }
447
448 if (udp6_csum_init(skb, uh, proto))
449 goto discard;
450
451 /*
452 * Multicast receive code
453 */
454 if (ipv6_addr_is_multicast(daddr))
455 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
456
457 /* Unicast */
458
459 /*
460 * check socket cache ... must talk to Alan about his plans
461 * for sock caches... i'll skip this for now.
462 */
463 sk = __udp6_lib_lookup(saddr, uh->source,
464 daddr, uh->dest, inet6_iif(skb), udptable);
465
466 if (sk == NULL) {
467 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
468 goto discard;
469
470 if (udp_lib_checksum_complete(skb))
471 goto discard;
472 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
473
474 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
475
476 kfree_skb(skb);
477 return 0;
478 }
479
480 /* deliver */
481
482 udpv6_queue_rcv_skb(sk, skb);
483 sock_put(sk);
484 return 0;
485
486 short_packet:
487 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
488 proto == IPPROTO_UDPLITE ? "-Lite" : "",
489 ulen, skb->len);
490
491 discard:
492 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
493 kfree_skb(skb);
494 return 0;
495 }
496
497 static __inline__ int udpv6_rcv(struct sk_buff *skb)
498 {
499 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
500 }
501
502 /*
503 * Throw away all pending data and cancel the corking. Socket is locked.
504 */
505 static void udp_v6_flush_pending_frames(struct sock *sk)
506 {
507 struct udp_sock *up = udp_sk(sk);
508
509 if (up->pending) {
510 up->len = 0;
511 up->pending = 0;
512 ip6_flush_pending_frames(sk);
513 }
514 }
515
516 /*
517 * Sending
518 */
519
520 static int udp_v6_push_pending_frames(struct sock *sk)
521 {
522 struct sk_buff *skb;
523 struct udphdr *uh;
524 struct udp_sock *up = udp_sk(sk);
525 struct inet_sock *inet = inet_sk(sk);
526 struct flowi *fl = &inet->cork.fl;
527 int err = 0;
528 __wsum csum = 0;
529
530 /* Grab the skbuff where UDP header space exists. */
531 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
532 goto out;
533
534 /*
535 * Create a UDP header
536 */
537 uh = udp_hdr(skb);
538 uh->source = fl->fl_ip_sport;
539 uh->dest = fl->fl_ip_dport;
540 uh->len = htons(up->len);
541 uh->check = 0;
542
543 if (up->pcflag)
544 csum = udplite_csum_outgoing(sk, skb);
545 else
546 csum = udp_csum_outgoing(sk, skb);
547
548 /* add protocol-dependent pseudo-header */
549 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
550 up->len, fl->proto, csum );
551 if (uh->check == 0)
552 uh->check = CSUM_MANGLED_0;
553
554 err = ip6_push_pending_frames(sk);
555 out:
556 up->len = 0;
557 up->pending = 0;
558 if (!err)
559 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, up->pcflag);
560 return err;
561 }
562
563 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
564 struct msghdr *msg, size_t len)
565 {
566 struct ipv6_txoptions opt_space;
567 struct udp_sock *up = udp_sk(sk);
568 struct inet_sock *inet = inet_sk(sk);
569 struct ipv6_pinfo *np = inet6_sk(sk);
570 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
571 struct in6_addr *daddr, *final_p = NULL, final;
572 struct ipv6_txoptions *opt = NULL;
573 struct ip6_flowlabel *flowlabel = NULL;
574 struct flowi fl;
575 struct dst_entry *dst;
576 int addr_len = msg->msg_namelen;
577 int ulen = len;
578 int hlimit = -1;
579 int tclass = -1;
580 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
581 int err;
582 int connected = 0;
583 int is_udplite = up->pcflag;
584 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
585
586 /* destination address check */
587 if (sin6) {
588 if (addr_len < offsetof(struct sockaddr, sa_data))
589 return -EINVAL;
590
591 switch (sin6->sin6_family) {
592 case AF_INET6:
593 if (addr_len < SIN6_LEN_RFC2133)
594 return -EINVAL;
595 daddr = &sin6->sin6_addr;
596 break;
597 case AF_INET:
598 goto do_udp_sendmsg;
599 case AF_UNSPEC:
600 msg->msg_name = sin6 = NULL;
601 msg->msg_namelen = addr_len = 0;
602 daddr = NULL;
603 break;
604 default:
605 return -EINVAL;
606 }
607 } else if (!up->pending) {
608 if (sk->sk_state != TCP_ESTABLISHED)
609 return -EDESTADDRREQ;
610 daddr = &np->daddr;
611 } else
612 daddr = NULL;
613
614 if (daddr) {
615 if (ipv6_addr_v4mapped(daddr)) {
616 struct sockaddr_in sin;
617 sin.sin_family = AF_INET;
618 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
619 sin.sin_addr.s_addr = daddr->s6_addr32[3];
620 msg->msg_name = &sin;
621 msg->msg_namelen = sizeof(sin);
622 do_udp_sendmsg:
623 if (__ipv6_only_sock(sk))
624 return -ENETUNREACH;
625 return udp_sendmsg(iocb, sk, msg, len);
626 }
627 }
628
629 if (up->pending == AF_INET)
630 return udp_sendmsg(iocb, sk, msg, len);
631
632 /* Rough check on arithmetic overflow,
633 better check is made in ip6_append_data().
634 */
635 if (len > INT_MAX - sizeof(struct udphdr))
636 return -EMSGSIZE;
637
638 if (up->pending) {
639 /*
640 * There are pending frames.
641 * The socket lock must be held while it's corked.
642 */
643 lock_sock(sk);
644 if (likely(up->pending)) {
645 if (unlikely(up->pending != AF_INET6)) {
646 release_sock(sk);
647 return -EAFNOSUPPORT;
648 }
649 dst = NULL;
650 goto do_append_data;
651 }
652 release_sock(sk);
653 }
654 ulen += sizeof(struct udphdr);
655
656 memset(&fl, 0, sizeof(fl));
657
658 if (sin6) {
659 if (sin6->sin6_port == 0)
660 return -EINVAL;
661
662 fl.fl_ip_dport = sin6->sin6_port;
663 daddr = &sin6->sin6_addr;
664
665 if (np->sndflow) {
666 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
667 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
668 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
669 if (flowlabel == NULL)
670 return -EINVAL;
671 daddr = &flowlabel->dst;
672 }
673 }
674
675 /*
676 * Otherwise it will be difficult to maintain
677 * sk->sk_dst_cache.
678 */
679 if (sk->sk_state == TCP_ESTABLISHED &&
680 ipv6_addr_equal(daddr, &np->daddr))
681 daddr = &np->daddr;
682
683 if (addr_len >= sizeof(struct sockaddr_in6) &&
684 sin6->sin6_scope_id &&
685 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
686 fl.oif = sin6->sin6_scope_id;
687 } else {
688 if (sk->sk_state != TCP_ESTABLISHED)
689 return -EDESTADDRREQ;
690
691 fl.fl_ip_dport = inet->dport;
692 daddr = &np->daddr;
693 fl.fl6_flowlabel = np->flow_label;
694 connected = 1;
695 }
696
697 if (!fl.oif)
698 fl.oif = sk->sk_bound_dev_if;
699
700 if (msg->msg_controllen) {
701 opt = &opt_space;
702 memset(opt, 0, sizeof(struct ipv6_txoptions));
703 opt->tot_len = sizeof(*opt);
704
705 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
706 if (err < 0) {
707 fl6_sock_release(flowlabel);
708 return err;
709 }
710 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
711 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
712 if (flowlabel == NULL)
713 return -EINVAL;
714 }
715 if (!(opt->opt_nflen|opt->opt_flen))
716 opt = NULL;
717 connected = 0;
718 }
719 if (opt == NULL)
720 opt = np->opt;
721 if (flowlabel)
722 opt = fl6_merge_options(&opt_space, flowlabel, opt);
723 opt = ipv6_fixup_options(&opt_space, opt);
724
725 fl.proto = sk->sk_protocol;
726 ipv6_addr_copy(&fl.fl6_dst, daddr);
727 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
728 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
729 fl.fl_ip_sport = inet->sport;
730
731 /* merge ip6_build_xmit from ip6_output */
732 if (opt && opt->srcrt) {
733 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
734 ipv6_addr_copy(&final, &fl.fl6_dst);
735 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
736 final_p = &final;
737 connected = 0;
738 }
739
740 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
741 fl.oif = np->mcast_oif;
742 connected = 0;
743 }
744
745 security_sk_classify_flow(sk, &fl);
746
747 err = ip6_sk_dst_lookup(sk, &dst, &fl);
748 if (err)
749 goto out;
750 if (final_p)
751 ipv6_addr_copy(&fl.fl6_dst, final_p);
752
753 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
754 if (err == -EREMOTE)
755 err = ip6_dst_blackhole(sk, &dst, &fl);
756 if (err < 0)
757 goto out;
758 }
759
760 if (hlimit < 0) {
761 if (ipv6_addr_is_multicast(&fl.fl6_dst))
762 hlimit = np->mcast_hops;
763 else
764 hlimit = np->hop_limit;
765 if (hlimit < 0)
766 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
767 if (hlimit < 0)
768 hlimit = ipv6_get_hoplimit(dst->dev);
769 }
770
771 if (tclass < 0) {
772 tclass = np->tclass;
773 if (tclass < 0)
774 tclass = 0;
775 }
776
777 if (msg->msg_flags&MSG_CONFIRM)
778 goto do_confirm;
779 back_from_confirm:
780
781 lock_sock(sk);
782 if (unlikely(up->pending)) {
783 /* The socket is already corked while preparing it. */
784 /* ... which is an evident application bug. --ANK */
785 release_sock(sk);
786
787 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
788 err = -EINVAL;
789 goto out;
790 }
791
792 up->pending = AF_INET6;
793
794 do_append_data:
795 up->len += ulen;
796 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
797 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
798 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
799 (struct rt6_info*)dst,
800 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
801 if (err)
802 udp_v6_flush_pending_frames(sk);
803 else if (!corkreq)
804 err = udp_v6_push_pending_frames(sk);
805 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
806 up->pending = 0;
807
808 if (dst) {
809 if (connected) {
810 ip6_dst_store(sk, dst,
811 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
812 &np->daddr : NULL,
813 #ifdef CONFIG_IPV6_SUBTREES
814 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
815 &np->saddr :
816 #endif
817 NULL);
818 } else {
819 dst_release(dst);
820 }
821 }
822
823 if (err > 0)
824 err = np->recverr ? net_xmit_errno(err) : 0;
825 release_sock(sk);
826 out:
827 fl6_sock_release(flowlabel);
828 if (!err)
829 return len;
830 /*
831 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
832 * ENOBUFS might not be good (it's not tunable per se), but otherwise
833 * we don't have a good statistic (IpOutDiscards but it can be too many
834 * things). We could add another new stat but at least for now that
835 * seems like overkill.
836 */
837 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
838 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
839 }
840 return err;
841
842 do_confirm:
843 dst_confirm(dst);
844 if (!(msg->msg_flags&MSG_PROBE) || len)
845 goto back_from_confirm;
846 err = 0;
847 goto out;
848 }
849
850 int udpv6_destroy_sock(struct sock *sk)
851 {
852 lock_sock(sk);
853 udp_v6_flush_pending_frames(sk);
854 release_sock(sk);
855
856 inet6_destroy_sock(sk);
857
858 return 0;
859 }
860
861 /*
862 * Socket option code for UDP
863 */
864 int udpv6_setsockopt(struct sock *sk, int level, int optname,
865 char __user *optval, int optlen)
866 {
867 if (level == SOL_UDP || level == SOL_UDPLITE)
868 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
869 udp_v6_push_pending_frames);
870 return ipv6_setsockopt(sk, level, optname, optval, optlen);
871 }
872
873 #ifdef CONFIG_COMPAT
874 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
875 char __user *optval, int optlen)
876 {
877 if (level == SOL_UDP || level == SOL_UDPLITE)
878 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
879 udp_v6_push_pending_frames);
880 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
881 }
882 #endif
883
884 int udpv6_getsockopt(struct sock *sk, int level, int optname,
885 char __user *optval, int __user *optlen)
886 {
887 if (level == SOL_UDP || level == SOL_UDPLITE)
888 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
889 return ipv6_getsockopt(sk, level, optname, optval, optlen);
890 }
891
892 #ifdef CONFIG_COMPAT
893 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
894 char __user *optval, int __user *optlen)
895 {
896 if (level == SOL_UDP || level == SOL_UDPLITE)
897 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
898 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
899 }
900 #endif
901
902 static struct inet6_protocol udpv6_protocol = {
903 .handler = udpv6_rcv,
904 .err_handler = udpv6_err,
905 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
906 };
907
908 /* ------------------------------------------------------------------------ */
909 #ifdef CONFIG_PROC_FS
910
911 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
912 {
913 struct inet_sock *inet = inet_sk(sp);
914 struct ipv6_pinfo *np = inet6_sk(sp);
915 struct in6_addr *dest, *src;
916 __u16 destp, srcp;
917
918 dest = &np->daddr;
919 src = &np->rcv_saddr;
920 destp = ntohs(inet->dport);
921 srcp = ntohs(inet->sport);
922 seq_printf(seq,
923 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
924 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
925 bucket,
926 src->s6_addr32[0], src->s6_addr32[1],
927 src->s6_addr32[2], src->s6_addr32[3], srcp,
928 dest->s6_addr32[0], dest->s6_addr32[1],
929 dest->s6_addr32[2], dest->s6_addr32[3], destp,
930 sp->sk_state,
931 atomic_read(&sp->sk_wmem_alloc),
932 atomic_read(&sp->sk_rmem_alloc),
933 0, 0L, 0,
934 sock_i_uid(sp), 0,
935 sock_i_ino(sp),
936 atomic_read(&sp->sk_refcnt), sp);
937 }
938
939 int udp6_seq_show(struct seq_file *seq, void *v)
940 {
941 if (v == SEQ_START_TOKEN)
942 seq_printf(seq,
943 " sl "
944 "local_address "
945 "remote_address "
946 "st tx_queue rx_queue tr tm->when retrnsmt"
947 " uid timeout inode\n");
948 else
949 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
950 return 0;
951 }
952
953 static struct file_operations udp6_seq_fops;
954 static struct udp_seq_afinfo udp6_seq_afinfo = {
955 .owner = THIS_MODULE,
956 .name = "udp6",
957 .family = AF_INET6,
958 .hashtable = udp_hash,
959 .seq_show = udp6_seq_show,
960 .seq_fops = &udp6_seq_fops,
961 };
962
963 int __init udp6_proc_init(void)
964 {
965 return udp_proc_register(&udp6_seq_afinfo);
966 }
967
968 void udp6_proc_exit(void) {
969 udp_proc_unregister(&udp6_seq_afinfo);
970 }
971 #endif /* CONFIG_PROC_FS */
972
973 /* ------------------------------------------------------------------------ */
974
975 DEFINE_PROTO_INUSE(udpv6)
976
977 struct proto udpv6_prot = {
978 .name = "UDPv6",
979 .owner = THIS_MODULE,
980 .close = udp_lib_close,
981 .connect = ip6_datagram_connect,
982 .disconnect = udp_disconnect,
983 .ioctl = udp_ioctl,
984 .destroy = udpv6_destroy_sock,
985 .setsockopt = udpv6_setsockopt,
986 .getsockopt = udpv6_getsockopt,
987 .sendmsg = udpv6_sendmsg,
988 .recvmsg = udpv6_recvmsg,
989 .backlog_rcv = udpv6_queue_rcv_skb,
990 .hash = udp_lib_hash,
991 .unhash = udp_lib_unhash,
992 .get_port = udp_v6_get_port,
993 .obj_size = sizeof(struct udp6_sock),
994 #ifdef CONFIG_COMPAT
995 .compat_setsockopt = compat_udpv6_setsockopt,
996 .compat_getsockopt = compat_udpv6_getsockopt,
997 #endif
998 REF_PROTO_INUSE(udpv6)
999 };
1000
1001 static struct inet_protosw udpv6_protosw = {
1002 .type = SOCK_DGRAM,
1003 .protocol = IPPROTO_UDP,
1004 .prot = &udpv6_prot,
1005 .ops = &inet6_dgram_ops,
1006 .capability =-1,
1007 .no_check = UDP_CSUM_DEFAULT,
1008 .flags = INET_PROTOSW_PERMANENT,
1009 };
1010
1011
1012 void __init udpv6_init(void)
1013 {
1014 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1015 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1016 inet6_register_protosw(&udpv6_protosw);
1017 }
Support for the Chinese Samsung S3C2440 based development boards