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[PATCH] Documentation/networking/dmfe.txt: Make documentation nicer
[linux-2.6/linux-loongson.git] / net / ipv6 / udp.c
blobeff050ac7049601e6cc040c14210ac678b16e788
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/config.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/sched.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/ipv6.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <asm/uaccess.h>
40
41 #include <net/sock.h>
42 #include <net/snmp.h>
43
44 #include <net/ipv6.h>
45 #include <net/ndisc.h>
46 #include <net/protocol.h>
47 #include <net/transp_v6.h>
48 #include <net/ip6_route.h>
49 #include <net/addrconf.h>
50 #include <net/ip.h>
51 #include <net/udp.h>
52 #include <net/raw.h>
53 #include <net/inet_common.h>
54
55 #include <net/ip6_checksum.h>
56 #include <net/xfrm.h>
57
58 #include <linux/proc_fs.h>
59 #include <linux/seq_file.h>
60
61 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
62
63 /* Grrr, addr_type already calculated by caller, but I don't want
64 * to add some silly "cookie" argument to this method just for that.
65 */
66 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
67 {
68 struct sock *sk2;
69 struct hlist_node *node;
70
71 write_lock_bh(&udp_hash_lock);
72 if (snum == 0) {
73 int best_size_so_far, best, result, i;
74
75 if (udp_port_rover > sysctl_local_port_range[1] ||
76 udp_port_rover < sysctl_local_port_range[0])
77 udp_port_rover = sysctl_local_port_range[0];
78 best_size_so_far = 32767;
79 best = result = udp_port_rover;
80 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
81 int size;
82 struct hlist_head *list;
83
84 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
85 if (hlist_empty(list)) {
86 if (result > sysctl_local_port_range[1])
87 result = sysctl_local_port_range[0] +
88 ((result - sysctl_local_port_range[0]) &
89 (UDP_HTABLE_SIZE - 1));
90 goto gotit;
91 }
92 size = 0;
93 sk_for_each(sk2, node, list)
94 if (++size >= best_size_so_far)
95 goto next;
96 best_size_so_far = size;
97 best = result;
98 next:;
99 }
100 result = best;
101 for(;; result += UDP_HTABLE_SIZE) {
102 if (result > sysctl_local_port_range[1])
103 result = sysctl_local_port_range[0]
104 + ((result - sysctl_local_port_range[0]) &
105 (UDP_HTABLE_SIZE - 1));
106 if (!udp_lport_inuse(result))
107 break;
108 }
109 gotit:
110 udp_port_rover = snum = result;
111 } else {
112 sk_for_each(sk2, node,
113 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
114 if (inet_sk(sk2)->num == snum &&
115 sk2 != sk &&
116 (!sk2->sk_bound_dev_if ||
117 !sk->sk_bound_dev_if ||
118 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
119 (!sk2->sk_reuse || !sk->sk_reuse) &&
120 ipv6_rcv_saddr_equal(sk, sk2))
121 goto fail;
122 }
123 }
124
125 inet_sk(sk)->num = snum;
126 if (sk_unhashed(sk)) {
127 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
128 sock_prot_inc_use(sk->sk_prot);
129 }
130 write_unlock_bh(&udp_hash_lock);
131 return 0;
132
133 fail:
134 write_unlock_bh(&udp_hash_lock);
135 return 1;
136 }
137
138 static void udp_v6_hash(struct sock *sk)
139 {
140 BUG();
141 }
142
143 static void udp_v6_unhash(struct sock *sk)
144 {
145 write_lock_bh(&udp_hash_lock);
146 if (sk_del_node_init(sk)) {
147 inet_sk(sk)->num = 0;
148 sock_prot_dec_use(sk->sk_prot);
149 }
150 write_unlock_bh(&udp_hash_lock);
151 }
152
153 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
154 struct in6_addr *daddr, u16 dport, int dif)
155 {
156 struct sock *sk, *result = NULL;
157 struct hlist_node *node;
158 unsigned short hnum = ntohs(dport);
159 int badness = -1;
160
161 read_lock(&udp_hash_lock);
162 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
163 struct inet_sock *inet = inet_sk(sk);
164
165 if (inet->num == hnum && sk->sk_family == PF_INET6) {
166 struct ipv6_pinfo *np = inet6_sk(sk);
167 int score = 0;
168 if (inet->dport) {
169 if (inet->dport != sport)
170 continue;
171 score++;
172 }
173 if (!ipv6_addr_any(&np->rcv_saddr)) {
174 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
175 continue;
176 score++;
177 }
178 if (!ipv6_addr_any(&np->daddr)) {
179 if (!ipv6_addr_equal(&np->daddr, saddr))
180 continue;
181 score++;
182 }
183 if (sk->sk_bound_dev_if) {
184 if (sk->sk_bound_dev_if != dif)
185 continue;
186 score++;
187 }
188 if(score == 4) {
189 result = sk;
190 break;
191 } else if(score > badness) {
192 result = sk;
193 badness = score;
194 }
195 }
196 }
197 if (result)
198 sock_hold(result);
199 read_unlock(&udp_hash_lock);
200 return result;
201 }
202
203 /*
204 *
205 */
206
207 static void udpv6_close(struct sock *sk, long timeout)
208 {
209 sk_common_release(sk);
210 }
211
212 /*
213 * This should be easy, if there is something there we
214 * return it, otherwise we block.
215 */
216
217 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
218 struct msghdr *msg, size_t len,
219 int noblock, int flags, int *addr_len)
220 {
221 struct ipv6_pinfo *np = inet6_sk(sk);
222 struct inet_sock *inet = inet_sk(sk);
223 struct sk_buff *skb;
224 size_t copied;
225 int err;
226
227 if (addr_len)
228 *addr_len=sizeof(struct sockaddr_in6);
229
230 if (flags & MSG_ERRQUEUE)
231 return ipv6_recv_error(sk, msg, len);
232
233 try_again:
234 skb = skb_recv_datagram(sk, flags, noblock, &err);
235 if (!skb)
236 goto out;
237
238 copied = skb->len - sizeof(struct udphdr);
239 if (copied > len) {
240 copied = len;
241 msg->msg_flags |= MSG_TRUNC;
242 }
243
244 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
245 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
246 copied);
247 } else if (msg->msg_flags&MSG_TRUNC) {
248 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
249 goto csum_copy_err;
250 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
251 copied);
252 } else {
253 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
254 if (err == -EINVAL)
255 goto csum_copy_err;
256 }
257 if (err)
258 goto out_free;
259
260 sock_recv_timestamp(msg, sk, skb);
261
262 /* Copy the address. */
263 if (msg->msg_name) {
264 struct sockaddr_in6 *sin6;
265
266 sin6 = (struct sockaddr_in6 *) msg->msg_name;
267 sin6->sin6_family = AF_INET6;
268 sin6->sin6_port = skb->h.uh->source;
269 sin6->sin6_flowinfo = 0;
270 sin6->sin6_scope_id = 0;
271
272 if (skb->protocol == htons(ETH_P_IP))
273 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
274 htonl(0xffff), skb->nh.iph->saddr);
275 else {
276 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
277 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
278 sin6->sin6_scope_id = IP6CB(skb)->iif;
279 }
280
281 }
282 if (skb->protocol == htons(ETH_P_IP)) {
283 if (inet->cmsg_flags)
284 ip_cmsg_recv(msg, skb);
285 } else {
286 if (np->rxopt.all)
287 datagram_recv_ctl(sk, msg, skb);
288 }
289
290 err = copied;
291 if (flags & MSG_TRUNC)
292 err = skb->len - sizeof(struct udphdr);
293
294 out_free:
295 skb_free_datagram(sk, skb);
296 out:
297 return err;
298
299 csum_copy_err:
300 /* Clear queue. */
301 if (flags&MSG_PEEK) {
302 int clear = 0;
303 spin_lock_bh(&sk->sk_receive_queue.lock);
304 if (skb == skb_peek(&sk->sk_receive_queue)) {
305 __skb_unlink(skb, &sk->sk_receive_queue);
306 clear = 1;
307 }
308 spin_unlock_bh(&sk->sk_receive_queue.lock);
309 if (clear)
310 kfree_skb(skb);
311 }
312
313 skb_free_datagram(sk, skb);
314
315 if (flags & MSG_DONTWAIT) {
316 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
317 return -EAGAIN;
318 }
319 goto try_again;
320 }
321
322 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
323 int type, int code, int offset, __u32 info)
324 {
325 struct ipv6_pinfo *np;
326 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
327 struct net_device *dev = skb->dev;
328 struct in6_addr *saddr = &hdr->saddr;
329 struct in6_addr *daddr = &hdr->daddr;
330 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
331 struct sock *sk;
332 int err;
333
334 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
335
336 if (sk == NULL)
337 return;
338
339 np = inet6_sk(sk);
340
341 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
342 goto out;
343
344 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
345 goto out;
346
347 if (np->recverr)
348 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
349
350 sk->sk_err = err;
351 sk->sk_error_report(sk);
352 out:
353 sock_put(sk);
354 }
355
356 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
357 {
358 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
359 kfree_skb(skb);
360 return -1;
361 }
362
363 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
364 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
365 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
366 kfree_skb(skb);
367 return 0;
368 }
369 skb->ip_summed = CHECKSUM_UNNECESSARY;
370 }
371
372 if (sock_queue_rcv_skb(sk,skb)<0) {
373 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
374 kfree_skb(skb);
375 return 0;
376 }
377 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
378 return 0;
379 }
380
381 static struct sock *udp_v6_mcast_next(struct sock *sk,
382 u16 loc_port, struct in6_addr *loc_addr,
383 u16 rmt_port, struct in6_addr *rmt_addr,
384 int dif)
385 {
386 struct hlist_node *node;
387 struct sock *s = sk;
388 unsigned short num = ntohs(loc_port);
389
390 sk_for_each_from(s, node) {
391 struct inet_sock *inet = inet_sk(s);
392
393 if (inet->num == num && s->sk_family == PF_INET6) {
394 struct ipv6_pinfo *np = inet6_sk(s);
395 if (inet->dport) {
396 if (inet->dport != rmt_port)
397 continue;
398 }
399 if (!ipv6_addr_any(&np->daddr) &&
400 !ipv6_addr_equal(&np->daddr, rmt_addr))
401 continue;
402
403 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
404 continue;
405
406 if (!ipv6_addr_any(&np->rcv_saddr)) {
407 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
408 return s;
409 continue;
410 }
411 if(!inet6_mc_check(s, loc_addr, rmt_addr))
412 continue;
413 return s;
414 }
415 }
416 return NULL;
417 }
418
419 /*
420 * Note: called only from the BH handler context,
421 * so we don't need to lock the hashes.
422 */
423 static void udpv6_mcast_deliver(struct udphdr *uh,
424 struct in6_addr *saddr, struct in6_addr *daddr,
425 struct sk_buff *skb)
426 {
427 struct sock *sk, *sk2;
428 int dif;
429
430 read_lock(&udp_hash_lock);
431 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
432 dif = skb->dev->ifindex;
433 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
434 if (!sk) {
435 kfree_skb(skb);
436 goto out;
437 }
438
439 sk2 = sk;
440 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
441 uh->source, saddr, dif))) {
442 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
443 if (buff)
444 udpv6_queue_rcv_skb(sk2, buff);
445 }
446 udpv6_queue_rcv_skb(sk, skb);
447 out:
448 read_unlock(&udp_hash_lock);
449 }
450
451 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
452 {
453 struct sk_buff *skb = *pskb;
454 struct sock *sk;
455 struct udphdr *uh;
456 struct net_device *dev = skb->dev;
457 struct in6_addr *saddr, *daddr;
458 u32 ulen = 0;
459
460 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
461 goto short_packet;
462
463 saddr = &skb->nh.ipv6h->saddr;
464 daddr = &skb->nh.ipv6h->daddr;
465 uh = skb->h.uh;
466
467 ulen = ntohs(uh->len);
468
469 /* Check for jumbo payload */
470 if (ulen == 0)
471 ulen = skb->len;
472
473 if (ulen > skb->len || ulen < sizeof(*uh))
474 goto short_packet;
475
476 if (uh->check == 0) {
477 /* RFC 2460 section 8.1 says that we SHOULD log
478 this error. Well, it is reasonable.
479 */
480 LIMIT_NETDEBUG(
481 printk(KERN_INFO "IPv6: udp checksum is 0\n"));
482 goto discard;
483 }
484
485 if (ulen < skb->len) {
486 if (__pskb_trim(skb, ulen))
487 goto discard;
488 saddr = &skb->nh.ipv6h->saddr;
489 daddr = &skb->nh.ipv6h->daddr;
490 uh = skb->h.uh;
491 }
492
493 if (skb->ip_summed==CHECKSUM_HW) {
494 skb->ip_summed = CHECKSUM_UNNECESSARY;
495 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
496 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
497 skb->ip_summed = CHECKSUM_NONE;
498 }
499 }
500 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
501 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
502
503 /*
504 * Multicast receive code
505 */
506 if (ipv6_addr_is_multicast(daddr)) {
507 udpv6_mcast_deliver(uh, saddr, daddr, skb);
508 return 0;
509 }
510
511 /* Unicast */
512
513 /*
514 * check socket cache ... must talk to Alan about his plans
515 * for sock caches... i'll skip this for now.
516 */
517 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
518
519 if (sk == NULL) {
520 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
521 goto discard;
522
523 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
524 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
525 goto discard;
526 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
527
528 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
529
530 kfree_skb(skb);
531 return(0);
532 }
533
534 /* deliver */
535
536 udpv6_queue_rcv_skb(sk, skb);
537 sock_put(sk);
538 return(0);
539
540 short_packet:
541 if (net_ratelimit())
542 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
543
544 discard:
545 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
546 kfree_skb(skb);
547 return(0);
548 }
549 /*
550 * Throw away all pending data and cancel the corking. Socket is locked.
551 */
552 static void udp_v6_flush_pending_frames(struct sock *sk)
553 {
554 struct udp_sock *up = udp_sk(sk);
555
556 if (up->pending) {
557 up->len = 0;
558 up->pending = 0;
559 ip6_flush_pending_frames(sk);
560 }
561 }
562
563 /*
564 * Sending
565 */
566
567 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
568 {
569 struct sk_buff *skb;
570 struct udphdr *uh;
571 struct inet_sock *inet = inet_sk(sk);
572 struct flowi *fl = &inet->cork.fl;
573 int err = 0;
574
575 /* Grab the skbuff where UDP header space exists. */
576 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
577 goto out;
578
579 /*
580 * Create a UDP header
581 */
582 uh = skb->h.uh;
583 uh->source = fl->fl_ip_sport;
584 uh->dest = fl->fl_ip_dport;
585 uh->len = htons(up->len);
586 uh->check = 0;
587
588 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
589 skb->ip_summed = CHECKSUM_NONE;
590 goto send;
591 }
592
593 if (skb_queue_len(&sk->sk_write_queue) == 1) {
594 skb->csum = csum_partial((char *)uh,
595 sizeof(struct udphdr), skb->csum);
596 uh->check = csum_ipv6_magic(&fl->fl6_src,
597 &fl->fl6_dst,
598 up->len, fl->proto, skb->csum);
599 } else {
600 u32 tmp_csum = 0;
601
602 skb_queue_walk(&sk->sk_write_queue, skb) {
603 tmp_csum = csum_add(tmp_csum, skb->csum);
604 }
605 tmp_csum = csum_partial((char *)uh,
606 sizeof(struct udphdr), tmp_csum);
607 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
608 &fl->fl6_dst,
609 up->len, fl->proto, tmp_csum);
610 uh->check = tmp_csum;
611
612 }
613 if (uh->check == 0)
614 uh->check = -1;
615
616 send:
617 err = ip6_push_pending_frames(sk);
618 out:
619 up->len = 0;
620 up->pending = 0;
621 return err;
622 }
623
624 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
625 struct msghdr *msg, size_t len)
626 {
627 struct ipv6_txoptions opt_space;
628 struct udp_sock *up = udp_sk(sk);
629 struct inet_sock *inet = inet_sk(sk);
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
632 struct in6_addr *daddr, *final_p = NULL, final;
633 struct ipv6_txoptions *opt = NULL;
634 struct ip6_flowlabel *flowlabel = NULL;
635 struct flowi *fl = &inet->cork.fl;
636 struct dst_entry *dst;
637 int addr_len = msg->msg_namelen;
638 int ulen = len;
639 int hlimit = -1;
640 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
641 int err;
642
643 /* destination address check */
644 if (sin6) {
645 if (addr_len < offsetof(struct sockaddr, sa_data))
646 return -EINVAL;
647
648 switch (sin6->sin6_family) {
649 case AF_INET6:
650 if (addr_len < SIN6_LEN_RFC2133)
651 return -EINVAL;
652 daddr = &sin6->sin6_addr;
653 break;
654 case AF_INET:
655 goto do_udp_sendmsg;
656 case AF_UNSPEC:
657 msg->msg_name = sin6 = NULL;
658 msg->msg_namelen = addr_len = 0;
659 daddr = NULL;
660 break;
661 default:
662 return -EINVAL;
663 }
664 } else if (!up->pending) {
665 if (sk->sk_state != TCP_ESTABLISHED)
666 return -EDESTADDRREQ;
667 daddr = &np->daddr;
668 } else
669 daddr = NULL;
670
671 if (daddr) {
672 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
673 struct sockaddr_in sin;
674 sin.sin_family = AF_INET;
675 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
676 sin.sin_addr.s_addr = daddr->s6_addr32[3];
677 msg->msg_name = &sin;
678 msg->msg_namelen = sizeof(sin);
679 do_udp_sendmsg:
680 if (__ipv6_only_sock(sk))
681 return -ENETUNREACH;
682 return udp_sendmsg(iocb, sk, msg, len);
683 }
684 }
685
686 if (up->pending == AF_INET)
687 return udp_sendmsg(iocb, sk, msg, len);
688
689 /* Rough check on arithmetic overflow,
690 better check is made in ip6_build_xmit
691 */
692 if (len > INT_MAX - sizeof(struct udphdr))
693 return -EMSGSIZE;
694
695 if (up->pending) {
696 /*
697 * There are pending frames.
698 * The socket lock must be held while it's corked.
699 */
700 lock_sock(sk);
701 if (likely(up->pending)) {
702 if (unlikely(up->pending != AF_INET6)) {
703 release_sock(sk);
704 return -EAFNOSUPPORT;
705 }
706 dst = NULL;
707 goto do_append_data;
708 }
709 release_sock(sk);
710 }
711 ulen += sizeof(struct udphdr);
712
713 memset(fl, 0, sizeof(*fl));
714
715 if (sin6) {
716 if (sin6->sin6_port == 0)
717 return -EINVAL;
718
719 fl->fl_ip_dport = sin6->sin6_port;
720 daddr = &sin6->sin6_addr;
721
722 if (np->sndflow) {
723 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
724 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
725 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
726 if (flowlabel == NULL)
727 return -EINVAL;
728 daddr = &flowlabel->dst;
729 }
730 }
731
732 /*
733 * Otherwise it will be difficult to maintain
734 * sk->sk_dst_cache.
735 */
736 if (sk->sk_state == TCP_ESTABLISHED &&
737 ipv6_addr_equal(daddr, &np->daddr))
738 daddr = &np->daddr;
739
740 if (addr_len >= sizeof(struct sockaddr_in6) &&
741 sin6->sin6_scope_id &&
742 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
743 fl->oif = sin6->sin6_scope_id;
744 } else {
745 if (sk->sk_state != TCP_ESTABLISHED)
746 return -EDESTADDRREQ;
747
748 fl->fl_ip_dport = inet->dport;
749 daddr = &np->daddr;
750 fl->fl6_flowlabel = np->flow_label;
751 }
752
753 if (!fl->oif)
754 fl->oif = sk->sk_bound_dev_if;
755
756 if (msg->msg_controllen) {
757 opt = &opt_space;
758 memset(opt, 0, sizeof(struct ipv6_txoptions));
759 opt->tot_len = sizeof(*opt);
760
761 err = datagram_send_ctl(msg, fl, opt, &hlimit);
762 if (err < 0) {
763 fl6_sock_release(flowlabel);
764 return err;
765 }
766 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
767 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
768 if (flowlabel == NULL)
769 return -EINVAL;
770 }
771 if (!(opt->opt_nflen|opt->opt_flen))
772 opt = NULL;
773 }
774 if (opt == NULL)
775 opt = np->opt;
776 if (flowlabel)
777 opt = fl6_merge_options(&opt_space, flowlabel, opt);
778
779 fl->proto = IPPROTO_UDP;
780 ipv6_addr_copy(&fl->fl6_dst, daddr);
781 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
782 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
783 fl->fl_ip_sport = inet->sport;
784
785 /* merge ip6_build_xmit from ip6_output */
786 if (opt && opt->srcrt) {
787 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
788 ipv6_addr_copy(&final, &fl->fl6_dst);
789 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
790 final_p = &final;
791 }
792
793 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
794 fl->oif = np->mcast_oif;
795
796 err = ip6_dst_lookup(sk, &dst, fl);
797 if (err)
798 goto out;
799 if (final_p)
800 ipv6_addr_copy(&fl->fl6_dst, final_p);
801
802 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
803 dst_release(dst);
804 goto out;
805 }
806
807 if (hlimit < 0) {
808 if (ipv6_addr_is_multicast(&fl->fl6_dst))
809 hlimit = np->mcast_hops;
810 else
811 hlimit = np->hop_limit;
812 if (hlimit < 0)
813 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
814 if (hlimit < 0)
815 hlimit = ipv6_get_hoplimit(dst->dev);
816 }
817
818 if (msg->msg_flags&MSG_CONFIRM)
819 goto do_confirm;
820 back_from_confirm:
821
822 lock_sock(sk);
823 if (unlikely(up->pending)) {
824 /* The socket is already corked while preparing it. */
825 /* ... which is an evident application bug. --ANK */
826 release_sock(sk);
827
828 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
829 err = -EINVAL;
830 goto out;
831 }
832
833 up->pending = AF_INET6;
834
835 do_append_data:
836 up->len += ulen;
837 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
838 hlimit, opt, fl, (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, up);
844
845 if (dst)
846 ip6_dst_store(sk, dst,
847 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
848 &np->daddr : NULL);
849 if (err > 0)
850 err = np->recverr ? net_xmit_errno(err) : 0;
851 release_sock(sk);
852 out:
853 fl6_sock_release(flowlabel);
854 if (!err) {
855 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
856 return len;
857 }
858 return err;
859
860 do_confirm:
861 dst_confirm(dst);
862 if (!(msg->msg_flags&MSG_PROBE) || len)
863 goto back_from_confirm;
864 err = 0;
865 goto out;
866 }
867
868 static int udpv6_destroy_sock(struct sock *sk)
869 {
870 lock_sock(sk);
871 udp_v6_flush_pending_frames(sk);
872 release_sock(sk);
873
874 inet6_destroy_sock(sk);
875
876 return 0;
877 }
878
879 /*
880 * Socket option code for UDP
881 */
882 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
883 char __user *optval, int optlen)
884 {
885 struct udp_sock *up = udp_sk(sk);
886 int val;
887 int err = 0;
888
889 if (level != SOL_UDP)
890 return ipv6_setsockopt(sk, level, optname, optval, optlen);
891
892 if(optlen<sizeof(int))
893 return -EINVAL;
894
895 if (get_user(val, (int __user *)optval))
896 return -EFAULT;
897
898 switch(optname) {
899 case UDP_CORK:
900 if (val != 0) {
901 up->corkflag = 1;
902 } else {
903 up->corkflag = 0;
904 lock_sock(sk);
905 udp_v6_push_pending_frames(sk, up);
906 release_sock(sk);
907 }
908 break;
909
910 case UDP_ENCAP:
911 switch (val) {
912 case 0:
913 up->encap_type = val;
914 break;
915 default:
916 err = -ENOPROTOOPT;
917 break;
918 }
919 break;
920
921 default:
922 err = -ENOPROTOOPT;
923 break;
924 };
925
926 return err;
927 }
928
929 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
930 char __user *optval, int __user *optlen)
931 {
932 struct udp_sock *up = udp_sk(sk);
933 int val, len;
934
935 if (level != SOL_UDP)
936 return ipv6_getsockopt(sk, level, optname, optval, optlen);
937
938 if(get_user(len,optlen))
939 return -EFAULT;
940
941 len = min_t(unsigned int, len, sizeof(int));
942
943 if(len < 0)
944 return -EINVAL;
945
946 switch(optname) {
947 case UDP_CORK:
948 val = up->corkflag;
949 break;
950
951 case UDP_ENCAP:
952 val = up->encap_type;
953 break;
954
955 default:
956 return -ENOPROTOOPT;
957 };
958
959 if(put_user(len, optlen))
960 return -EFAULT;
961 if(copy_to_user(optval, &val,len))
962 return -EFAULT;
963 return 0;
964 }
965
966 static struct inet6_protocol udpv6_protocol = {
967 .handler = udpv6_rcv,
968 .err_handler = udpv6_err,
969 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
970 };
971
972 /* ------------------------------------------------------------------------ */
973 #ifdef CONFIG_PROC_FS
974
975 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
976 {
977 struct inet_sock *inet = inet_sk(sp);
978 struct ipv6_pinfo *np = inet6_sk(sp);
979 struct in6_addr *dest, *src;
980 __u16 destp, srcp;
981
982 dest = &np->daddr;
983 src = &np->rcv_saddr;
984 destp = ntohs(inet->dport);
985 srcp = ntohs(inet->sport);
986 seq_printf(seq,
987 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
988 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
989 bucket,
990 src->s6_addr32[0], src->s6_addr32[1],
991 src->s6_addr32[2], src->s6_addr32[3], srcp,
992 dest->s6_addr32[0], dest->s6_addr32[1],
993 dest->s6_addr32[2], dest->s6_addr32[3], destp,
994 sp->sk_state,
995 atomic_read(&sp->sk_wmem_alloc),
996 atomic_read(&sp->sk_rmem_alloc),
997 0, 0L, 0,
998 sock_i_uid(sp), 0,
999 sock_i_ino(sp),
1000 atomic_read(&sp->sk_refcnt), sp);
1001 }
1002
1003 static int udp6_seq_show(struct seq_file *seq, void *v)
1004 {
1005 if (v == SEQ_START_TOKEN)
1006 seq_printf(seq,
1007 " sl "
1008 "local_address "
1009 "remote_address "
1010 "st tx_queue rx_queue tr tm->when retrnsmt"
1011 " uid timeout inode\n");
1012 else
1013 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1014 return 0;
1015 }
1016
1017 static struct file_operations udp6_seq_fops;
1018 static struct udp_seq_afinfo udp6_seq_afinfo = {
1019 .owner = THIS_MODULE,
1020 .name = "udp6",
1021 .family = AF_INET6,
1022 .seq_show = udp6_seq_show,
1023 .seq_fops = &udp6_seq_fops,
1024 };
1025
1026 int __init udp6_proc_init(void)
1027 {
1028 return udp_proc_register(&udp6_seq_afinfo);
1029 }
1030
1031 void udp6_proc_exit(void) {
1032 udp_proc_unregister(&udp6_seq_afinfo);
1033 }
1034 #endif /* CONFIG_PROC_FS */
1035
1036 /* ------------------------------------------------------------------------ */
1037
1038 struct proto udpv6_prot = {
1039 .name = "UDPv6",
1040 .owner = THIS_MODULE,
1041 .close = udpv6_close,
1042 .connect = ip6_datagram_connect,
1043 .disconnect = udp_disconnect,
1044 .ioctl = udp_ioctl,
1045 .destroy = udpv6_destroy_sock,
1046 .setsockopt = udpv6_setsockopt,
1047 .getsockopt = udpv6_getsockopt,
1048 .sendmsg = udpv6_sendmsg,
1049 .recvmsg = udpv6_recvmsg,
1050 .backlog_rcv = udpv6_queue_rcv_skb,
1051 .hash = udp_v6_hash,
1052 .unhash = udp_v6_unhash,
1053 .get_port = udp_v6_get_port,
1054 .obj_size = sizeof(struct udp6_sock),
1055 };
1056
1057 extern struct proto_ops inet6_dgram_ops;
1058
1059 static struct inet_protosw udpv6_protosw = {
1060 .type = SOCK_DGRAM,
1061 .protocol = IPPROTO_UDP,
1062 .prot = &udpv6_prot,
1063 .ops = &inet6_dgram_ops,
1064 .capability =-1,
1065 .no_check = UDP_CSUM_DEFAULT,
1066 .flags = INET_PROTOSW_PERMANENT,
1067 };
1068
1069
1070 void __init udpv6_init(void)
1071 {
1072 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1073 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1074 inet6_register_protosw(&udpv6_protosw);
1075 }
linux kernel for loongson