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[UDP]: Clean up UDP-Lite receive checksum
[linux-2.6/cjktty.git] / net / ipv6 / udp.c
blob73337168979575258250a75e9e1e598769541849
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->ip_summed == CHECKSUM_UNNECESSARY)
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 sock_recv_timestamp(msg, sk, skb);
168
169 /* Copy the address. */
170 if (msg->msg_name) {
171 struct sockaddr_in6 *sin6;
172
173 sin6 = (struct sockaddr_in6 *) msg->msg_name;
174 sin6->sin6_family = AF_INET6;
175 sin6->sin6_port = skb->h.uh->source;
176 sin6->sin6_flowinfo = 0;
177 sin6->sin6_scope_id = 0;
178
179 if (skb->protocol == htons(ETH_P_IP))
180 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
181 htonl(0xffff), skb->nh.iph->saddr);
182 else {
183 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
184 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
185 sin6->sin6_scope_id = IP6CB(skb)->iif;
186 }
187
188 }
189 if (skb->protocol == htons(ETH_P_IP)) {
190 if (inet->cmsg_flags)
191 ip_cmsg_recv(msg, skb);
192 } else {
193 if (np->rxopt.all)
194 datagram_recv_ctl(sk, msg, skb);
195 }
196
197 err = copied;
198 if (flags & MSG_TRUNC)
199 err = ulen;
200
201 out_free:
202 skb_free_datagram(sk, skb);
203 out:
204 return err;
205
206 csum_copy_err:
207 skb_kill_datagram(sk, skb, flags);
208
209 if (flags & MSG_DONTWAIT) {
210 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
211 return -EAGAIN;
212 }
213 goto try_again;
214 }
215
216 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
217 int type, int code, int offset, __be32 info,
218 struct hlist_head udptable[] )
219 {
220 struct ipv6_pinfo *np;
221 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
222 struct in6_addr *saddr = &hdr->saddr;
223 struct in6_addr *daddr = &hdr->daddr;
224 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
225 struct sock *sk;
226 int err;
227
228 sk = __udp6_lib_lookup(daddr, uh->dest,
229 saddr, uh->source, inet6_iif(skb), udptable);
230 if (sk == NULL)
231 return;
232
233 np = inet6_sk(sk);
234
235 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
236 goto out;
237
238 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
239 goto out;
240
241 if (np->recverr)
242 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
243
244 sk->sk_err = err;
245 sk->sk_error_report(sk);
246 out:
247 sock_put(sk);
248 }
249
250 static __inline__ void udpv6_err(struct sk_buff *skb,
251 struct inet6_skb_parm *opt, int type,
252 int code, int offset, __be32 info )
253 {
254 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
255 }
256
257 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
258 {
259 struct udp_sock *up = udp_sk(sk);
260 int rc;
261
262 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
263 goto drop;
264
265 /*
266 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
267 */
268 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
269
270 if (up->pcrlen == 0) { /* full coverage was set */
271 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
272 " %d while full coverage %d requested\n",
273 UDP_SKB_CB(skb)->cscov, skb->len);
274 goto drop;
275 }
276 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
277 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
278 "too small, need min %d\n",
279 UDP_SKB_CB(skb)->cscov, up->pcrlen);
280 goto drop;
281 }
282 }
283
284 if (sk->sk_filter) {
285 if (udp_lib_checksum_complete(skb))
286 goto drop;
287 }
288
289 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
290 /* Note that an ENOMEM error is charged twice */
291 if (rc == -ENOMEM)
292 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
293 goto drop;
294 }
295 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
296 return 0;
297 drop:
298 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
299 kfree_skb(skb);
300 return -1;
301 }
302
303 static struct sock *udp_v6_mcast_next(struct sock *sk,
304 __be16 loc_port, struct in6_addr *loc_addr,
305 __be16 rmt_port, struct in6_addr *rmt_addr,
306 int dif)
307 {
308 struct hlist_node *node;
309 struct sock *s = sk;
310 unsigned short num = ntohs(loc_port);
311
312 sk_for_each_from(s, node) {
313 struct inet_sock *inet = inet_sk(s);
314
315 if (s->sk_hash == num && s->sk_family == PF_INET6) {
316 struct ipv6_pinfo *np = inet6_sk(s);
317 if (inet->dport) {
318 if (inet->dport != rmt_port)
319 continue;
320 }
321 if (!ipv6_addr_any(&np->daddr) &&
322 !ipv6_addr_equal(&np->daddr, rmt_addr))
323 continue;
324
325 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
326 continue;
327
328 if (!ipv6_addr_any(&np->rcv_saddr)) {
329 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
330 continue;
331 }
332 if(!inet6_mc_check(s, loc_addr, rmt_addr))
333 continue;
334 return s;
335 }
336 }
337 return NULL;
338 }
339
340 /*
341 * Note: called only from the BH handler context,
342 * so we don't need to lock the hashes.
343 */
344 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
345 struct in6_addr *daddr, struct hlist_head udptable[])
346 {
347 struct sock *sk, *sk2;
348 const struct udphdr *uh = skb->h.uh;
349 int dif;
350
351 read_lock(&udp_hash_lock);
352 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
353 dif = inet6_iif(skb);
354 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
355 if (!sk) {
356 kfree_skb(skb);
357 goto out;
358 }
359
360 sk2 = sk;
361 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
362 uh->source, saddr, dif))) {
363 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
364 if (buff)
365 udpv6_queue_rcv_skb(sk2, buff);
366 }
367 udpv6_queue_rcv_skb(sk, skb);
368 out:
369 read_unlock(&udp_hash_lock);
370 return 0;
371 }
372
373 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
374 int proto)
375 {
376 int err;
377
378 UDP_SKB_CB(skb)->partial_cov = 0;
379 UDP_SKB_CB(skb)->cscov = skb->len;
380
381 if (proto == IPPROTO_UDPLITE) {
382 err = udplite_checksum_init(skb, uh);
383 if (err)
384 return err;
385 }
386
387 if (uh->check == 0) {
388 /* RFC 2460 section 8.1 says that we SHOULD log
389 this error. Well, it is reasonable.
390 */
391 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
392 return 1;
393 }
394 if (skb->ip_summed == CHECKSUM_COMPLETE &&
395 !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
396 skb->len, proto, skb->csum))
397 skb->ip_summed = CHECKSUM_UNNECESSARY;
398
399 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
400 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
401 &skb->nh.ipv6h->daddr,
402 skb->len, proto, 0));
403
404 return 0;
405 }
406
407 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
408 int proto)
409 {
410 struct sk_buff *skb = *pskb;
411 struct sock *sk;
412 struct udphdr *uh;
413 struct net_device *dev = skb->dev;
414 struct in6_addr *saddr, *daddr;
415 u32 ulen = 0;
416
417 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
418 goto short_packet;
419
420 saddr = &skb->nh.ipv6h->saddr;
421 daddr = &skb->nh.ipv6h->daddr;
422 uh = skb->h.uh;
423
424 ulen = ntohs(uh->len);
425 if (ulen > skb->len)
426 goto short_packet;
427
428 if (proto == IPPROTO_UDP) {
429 /* UDP validates ulen. */
430
431 /* Check for jumbo payload */
432 if (ulen == 0)
433 ulen = skb->len;
434
435 if (ulen < sizeof(*uh))
436 goto short_packet;
437
438 if (ulen < skb->len) {
439 if (pskb_trim_rcsum(skb, ulen))
440 goto short_packet;
441 saddr = &skb->nh.ipv6h->saddr;
442 daddr = &skb->nh.ipv6h->daddr;
443 uh = skb->h.uh;
444 }
445 }
446
447 if (udp6_csum_init(skb, uh, proto))
448 goto discard;
449
450 /*
451 * Multicast receive code
452 */
453 if (ipv6_addr_is_multicast(daddr))
454 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
455
456 /* Unicast */
457
458 /*
459 * check socket cache ... must talk to Alan about his plans
460 * for sock caches... i'll skip this for now.
461 */
462 sk = __udp6_lib_lookup(saddr, uh->source,
463 daddr, uh->dest, inet6_iif(skb), udptable);
464
465 if (sk == NULL) {
466 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
467 goto discard;
468
469 if (udp_lib_checksum_complete(skb))
470 goto discard;
471 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
472
473 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
474
475 kfree_skb(skb);
476 return(0);
477 }
478
479 /* deliver */
480
481 udpv6_queue_rcv_skb(sk, skb);
482 sock_put(sk);
483 return(0);
484
485 short_packet:
486 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
487 proto == IPPROTO_UDPLITE ? "-Lite" : "",
488 ulen, skb->len);
489
490 discard:
491 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
492 kfree_skb(skb);
493 return(0);
494 }
495
496 static __inline__ int udpv6_rcv(struct sk_buff **pskb)
497 {
498 return __udp6_lib_rcv(pskb, udp_hash, IPPROTO_UDP);
499 }
500
501 /*
502 * Throw away all pending data and cancel the corking. Socket is locked.
503 */
504 static void udp_v6_flush_pending_frames(struct sock *sk)
505 {
506 struct udp_sock *up = udp_sk(sk);
507
508 if (up->pending) {
509 up->len = 0;
510 up->pending = 0;
511 ip6_flush_pending_frames(sk);
512 }
513 }
514
515 /*
516 * Sending
517 */
518
519 static int udp_v6_push_pending_frames(struct sock *sk)
520 {
521 struct sk_buff *skb;
522 struct udphdr *uh;
523 struct udp_sock *up = udp_sk(sk);
524 struct inet_sock *inet = inet_sk(sk);
525 struct flowi *fl = &inet->cork.fl;
526 int err = 0;
527 __wsum csum = 0;
528
529 /* Grab the skbuff where UDP header space exists. */
530 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
531 goto out;
532
533 /*
534 * Create a UDP header
535 */
536 uh = skb->h.uh;
537 uh->source = fl->fl_ip_sport;
538 uh->dest = fl->fl_ip_dport;
539 uh->len = htons(up->len);
540 uh->check = 0;
541
542 if (up->pcflag)
543 csum = udplite_csum_outgoing(sk, skb);
544 else
545 csum = udp_csum_outgoing(sk, skb);
546
547 /* add protocol-dependent pseudo-header */
548 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
549 up->len, fl->proto, csum );
550 if (uh->check == 0)
551 uh->check = CSUM_MANGLED_0;
552
553 err = ip6_push_pending_frames(sk);
554 out:
555 up->len = 0;
556 up->pending = 0;
557 return err;
558 }
559
560 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
561 struct msghdr *msg, size_t len)
562 {
563 struct ipv6_txoptions opt_space;
564 struct udp_sock *up = udp_sk(sk);
565 struct inet_sock *inet = inet_sk(sk);
566 struct ipv6_pinfo *np = inet6_sk(sk);
567 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
568 struct in6_addr *daddr, *final_p = NULL, final;
569 struct ipv6_txoptions *opt = NULL;
570 struct ip6_flowlabel *flowlabel = NULL;
571 struct flowi fl;
572 struct dst_entry *dst;
573 int addr_len = msg->msg_namelen;
574 int ulen = len;
575 int hlimit = -1;
576 int tclass = -1;
577 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
578 int err;
579 int connected = 0;
580 int is_udplite = up->pcflag;
581 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
582
583 /* destination address check */
584 if (sin6) {
585 if (addr_len < offsetof(struct sockaddr, sa_data))
586 return -EINVAL;
587
588 switch (sin6->sin6_family) {
589 case AF_INET6:
590 if (addr_len < SIN6_LEN_RFC2133)
591 return -EINVAL;
592 daddr = &sin6->sin6_addr;
593 break;
594 case AF_INET:
595 goto do_udp_sendmsg;
596 case AF_UNSPEC:
597 msg->msg_name = sin6 = NULL;
598 msg->msg_namelen = addr_len = 0;
599 daddr = NULL;
600 break;
601 default:
602 return -EINVAL;
603 }
604 } else if (!up->pending) {
605 if (sk->sk_state != TCP_ESTABLISHED)
606 return -EDESTADDRREQ;
607 daddr = &np->daddr;
608 } else
609 daddr = NULL;
610
611 if (daddr) {
612 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
613 struct sockaddr_in sin;
614 sin.sin_family = AF_INET;
615 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
616 sin.sin_addr.s_addr = daddr->s6_addr32[3];
617 msg->msg_name = &sin;
618 msg->msg_namelen = sizeof(sin);
619 do_udp_sendmsg:
620 if (__ipv6_only_sock(sk))
621 return -ENETUNREACH;
622 return udp_sendmsg(iocb, sk, msg, len);
623 }
624 }
625
626 if (up->pending == AF_INET)
627 return udp_sendmsg(iocb, sk, msg, len);
628
629 /* Rough check on arithmetic overflow,
630 better check is made in ip6_append_data().
631 */
632 if (len > INT_MAX - sizeof(struct udphdr))
633 return -EMSGSIZE;
634
635 if (up->pending) {
636 /*
637 * There are pending frames.
638 * The socket lock must be held while it's corked.
639 */
640 lock_sock(sk);
641 if (likely(up->pending)) {
642 if (unlikely(up->pending != AF_INET6)) {
643 release_sock(sk);
644 return -EAFNOSUPPORT;
645 }
646 dst = NULL;
647 goto do_append_data;
648 }
649 release_sock(sk);
650 }
651 ulen += sizeof(struct udphdr);
652
653 memset(&fl, 0, sizeof(fl));
654
655 if (sin6) {
656 if (sin6->sin6_port == 0)
657 return -EINVAL;
658
659 fl.fl_ip_dport = sin6->sin6_port;
660 daddr = &sin6->sin6_addr;
661
662 if (np->sndflow) {
663 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
664 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
665 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
666 if (flowlabel == NULL)
667 return -EINVAL;
668 daddr = &flowlabel->dst;
669 }
670 }
671
672 /*
673 * Otherwise it will be difficult to maintain
674 * sk->sk_dst_cache.
675 */
676 if (sk->sk_state == TCP_ESTABLISHED &&
677 ipv6_addr_equal(daddr, &np->daddr))
678 daddr = &np->daddr;
679
680 if (addr_len >= sizeof(struct sockaddr_in6) &&
681 sin6->sin6_scope_id &&
682 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
683 fl.oif = sin6->sin6_scope_id;
684 } else {
685 if (sk->sk_state != TCP_ESTABLISHED)
686 return -EDESTADDRREQ;
687
688 fl.fl_ip_dport = inet->dport;
689 daddr = &np->daddr;
690 fl.fl6_flowlabel = np->flow_label;
691 connected = 1;
692 }
693
694 if (!fl.oif)
695 fl.oif = sk->sk_bound_dev_if;
696
697 if (msg->msg_controllen) {
698 opt = &opt_space;
699 memset(opt, 0, sizeof(struct ipv6_txoptions));
700 opt->tot_len = sizeof(*opt);
701
702 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
703 if (err < 0) {
704 fl6_sock_release(flowlabel);
705 return err;
706 }
707 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
708 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
709 if (flowlabel == NULL)
710 return -EINVAL;
711 }
712 if (!(opt->opt_nflen|opt->opt_flen))
713 opt = NULL;
714 connected = 0;
715 }
716 if (opt == NULL)
717 opt = np->opt;
718 if (flowlabel)
719 opt = fl6_merge_options(&opt_space, flowlabel, opt);
720 opt = ipv6_fixup_options(&opt_space, opt);
721
722 fl.proto = sk->sk_protocol;
723 ipv6_addr_copy(&fl.fl6_dst, daddr);
724 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
725 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
726 fl.fl_ip_sport = inet->sport;
727
728 /* merge ip6_build_xmit from ip6_output */
729 if (opt && opt->srcrt) {
730 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
731 ipv6_addr_copy(&final, &fl.fl6_dst);
732 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
733 final_p = &final;
734 connected = 0;
735 }
736
737 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
738 fl.oif = np->mcast_oif;
739 connected = 0;
740 }
741
742 security_sk_classify_flow(sk, &fl);
743
744 err = ip6_sk_dst_lookup(sk, &dst, &fl);
745 if (err)
746 goto out;
747 if (final_p)
748 ipv6_addr_copy(&fl.fl6_dst, final_p);
749
750 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
751 goto out;
752
753 if (hlimit < 0) {
754 if (ipv6_addr_is_multicast(&fl.fl6_dst))
755 hlimit = np->mcast_hops;
756 else
757 hlimit = np->hop_limit;
758 if (hlimit < 0)
759 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
760 if (hlimit < 0)
761 hlimit = ipv6_get_hoplimit(dst->dev);
762 }
763
764 if (tclass < 0) {
765 tclass = np->tclass;
766 if (tclass < 0)
767 tclass = 0;
768 }
769
770 if (msg->msg_flags&MSG_CONFIRM)
771 goto do_confirm;
772 back_from_confirm:
773
774 lock_sock(sk);
775 if (unlikely(up->pending)) {
776 /* The socket is already corked while preparing it. */
777 /* ... which is an evident application bug. --ANK */
778 release_sock(sk);
779
780 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
781 err = -EINVAL;
782 goto out;
783 }
784
785 up->pending = AF_INET6;
786
787 do_append_data:
788 up->len += ulen;
789 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
790 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
791 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
792 (struct rt6_info*)dst,
793 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
794 if (err)
795 udp_v6_flush_pending_frames(sk);
796 else if (!corkreq)
797 err = udp_v6_push_pending_frames(sk);
798 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
799 up->pending = 0;
800
801 if (dst) {
802 if (connected) {
803 ip6_dst_store(sk, dst,
804 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
805 &np->daddr : NULL,
806 #ifdef CONFIG_IPV6_SUBTREES
807 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
808 &np->saddr :
809 #endif
810 NULL);
811 } else {
812 dst_release(dst);
813 }
814 }
815
816 if (err > 0)
817 err = np->recverr ? net_xmit_errno(err) : 0;
818 release_sock(sk);
819 out:
820 fl6_sock_release(flowlabel);
821 if (!err) {
822 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
823 return len;
824 }
825 /*
826 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
827 * ENOBUFS might not be good (it's not tunable per se), but otherwise
828 * we don't have a good statistic (IpOutDiscards but it can be too many
829 * things). We could add another new stat but at least for now that
830 * seems like overkill.
831 */
832 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
833 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
834 }
835 return err;
836
837 do_confirm:
838 dst_confirm(dst);
839 if (!(msg->msg_flags&MSG_PROBE) || len)
840 goto back_from_confirm;
841 err = 0;
842 goto out;
843 }
844
845 int udpv6_destroy_sock(struct sock *sk)
846 {
847 lock_sock(sk);
848 udp_v6_flush_pending_frames(sk);
849 release_sock(sk);
850
851 inet6_destroy_sock(sk);
852
853 return 0;
854 }
855
856 /*
857 * Socket option code for UDP
858 */
859 int udpv6_setsockopt(struct sock *sk, int level, int optname,
860 char __user *optval, int optlen)
861 {
862 if (level == SOL_UDP || level == SOL_UDPLITE)
863 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
864 udp_v6_push_pending_frames);
865 return ipv6_setsockopt(sk, level, optname, optval, optlen);
866 }
867
868 #ifdef CONFIG_COMPAT
869 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
870 char __user *optval, int optlen)
871 {
872 if (level == SOL_UDP || level == SOL_UDPLITE)
873 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
874 udp_v6_push_pending_frames);
875 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
876 }
877 #endif
878
879 int udpv6_getsockopt(struct sock *sk, int level, int optname,
880 char __user *optval, int __user *optlen)
881 {
882 if (level == SOL_UDP || level == SOL_UDPLITE)
883 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
884 return ipv6_getsockopt(sk, level, optname, optval, optlen);
885 }
886
887 #ifdef CONFIG_COMPAT
888 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
889 char __user *optval, int __user *optlen)
890 {
891 if (level == SOL_UDP || level == SOL_UDPLITE)
892 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
893 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
894 }
895 #endif
896
897 static struct inet6_protocol udpv6_protocol = {
898 .handler = udpv6_rcv,
899 .err_handler = udpv6_err,
900 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
901 };
902
903 /* ------------------------------------------------------------------------ */
904 #ifdef CONFIG_PROC_FS
905
906 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
907 {
908 struct inet_sock *inet = inet_sk(sp);
909 struct ipv6_pinfo *np = inet6_sk(sp);
910 struct in6_addr *dest, *src;
911 __u16 destp, srcp;
912
913 dest = &np->daddr;
914 src = &np->rcv_saddr;
915 destp = ntohs(inet->dport);
916 srcp = ntohs(inet->sport);
917 seq_printf(seq,
918 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
919 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
920 bucket,
921 src->s6_addr32[0], src->s6_addr32[1],
922 src->s6_addr32[2], src->s6_addr32[3], srcp,
923 dest->s6_addr32[0], dest->s6_addr32[1],
924 dest->s6_addr32[2], dest->s6_addr32[3], destp,
925 sp->sk_state,
926 atomic_read(&sp->sk_wmem_alloc),
927 atomic_read(&sp->sk_rmem_alloc),
928 0, 0L, 0,
929 sock_i_uid(sp), 0,
930 sock_i_ino(sp),
931 atomic_read(&sp->sk_refcnt), sp);
932 }
933
934 int udp6_seq_show(struct seq_file *seq, void *v)
935 {
936 if (v == SEQ_START_TOKEN)
937 seq_printf(seq,
938 " sl "
939 "local_address "
940 "remote_address "
941 "st tx_queue rx_queue tr tm->when retrnsmt"
942 " uid timeout inode\n");
943 else
944 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
945 return 0;
946 }
947
948 static struct file_operations udp6_seq_fops;
949 static struct udp_seq_afinfo udp6_seq_afinfo = {
950 .owner = THIS_MODULE,
951 .name = "udp6",
952 .family = AF_INET6,
953 .hashtable = udp_hash,
954 .seq_show = udp6_seq_show,
955 .seq_fops = &udp6_seq_fops,
956 };
957
958 int __init udp6_proc_init(void)
959 {
960 return udp_proc_register(&udp6_seq_afinfo);
961 }
962
963 void udp6_proc_exit(void) {
964 udp_proc_unregister(&udp6_seq_afinfo);
965 }
966 #endif /* CONFIG_PROC_FS */
967
968 /* ------------------------------------------------------------------------ */
969
970 struct proto udpv6_prot = {
971 .name = "UDPv6",
972 .owner = THIS_MODULE,
973 .close = udp_lib_close,
974 .connect = ip6_datagram_connect,
975 .disconnect = udp_disconnect,
976 .ioctl = udp_ioctl,
977 .destroy = udpv6_destroy_sock,
978 .setsockopt = udpv6_setsockopt,
979 .getsockopt = udpv6_getsockopt,
980 .sendmsg = udpv6_sendmsg,
981 .recvmsg = udpv6_recvmsg,
982 .backlog_rcv = udpv6_queue_rcv_skb,
983 .hash = udp_lib_hash,
984 .unhash = udp_lib_unhash,
985 .get_port = udp_v6_get_port,
986 .obj_size = sizeof(struct udp6_sock),
987 #ifdef CONFIG_COMPAT
988 .compat_setsockopt = compat_udpv6_setsockopt,
989 .compat_getsockopt = compat_udpv6_getsockopt,
990 #endif
991 };
992
993 static struct inet_protosw udpv6_protosw = {
994 .type = SOCK_DGRAM,
995 .protocol = IPPROTO_UDP,
996 .prot = &udpv6_prot,
997 .ops = &inet6_dgram_ops,
998 .capability =-1,
999 .no_check = UDP_CSUM_DEFAULT,
1000 .flags = INET_PROTOSW_PERMANENT,
1001 };
1002
1003
1004 void __init udpv6_init(void)
1005 {
1006 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1007 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1008 inet6_register_protosw(&udpv6_protosw);
1009 }
CJK support for tty framebuffer vt