?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
initial commit with v2.6.9
[linux-2.6.9-moxart.git] / net / ipv6 / udp.c
blobff00dc49cdd89948abf9ebb9d1761bb9dc645b54
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_opt *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_cmp(&np->rcv_saddr, daddr))
175 continue;
176 score++;
177 }
178 if (!ipv6_addr_any(&np->daddr)) {
179 if (ipv6_addr_cmp(&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 sk_buff *skb;
223 size_t copied;
224 int err;
225
226 if (addr_len)
227 *addr_len=sizeof(struct sockaddr_in6);
228
229 if (flags & MSG_ERRQUEUE)
230 return ipv6_recv_error(sk, msg, len);
231
232 try_again:
233 skb = skb_recv_datagram(sk, flags, noblock, &err);
234 if (!skb)
235 goto out;
236
237 copied = skb->len - sizeof(struct udphdr);
238 if (copied > len) {
239 copied = len;
240 msg->msg_flags |= MSG_TRUNC;
241 }
242
243 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
244 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
245 copied);
246 } else if (msg->msg_flags&MSG_TRUNC) {
247 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
248 goto csum_copy_err;
249 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
250 copied);
251 } else {
252 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
253 if (err == -EINVAL)
254 goto csum_copy_err;
255 }
256 if (err)
257 goto out_free;
258
259 sock_recv_timestamp(msg, sk, skb);
260
261 /* Copy the address. */
262 if (msg->msg_name) {
263 struct sockaddr_in6 *sin6;
264
265 sin6 = (struct sockaddr_in6 *) msg->msg_name;
266 sin6->sin6_family = AF_INET6;
267 sin6->sin6_port = skb->h.uh->source;
268 sin6->sin6_flowinfo = 0;
269 sin6->sin6_scope_id = 0;
270
271 if (skb->protocol == htons(ETH_P_IP)) {
272 struct inet_opt *inet = inet_sk(sk);
273
274 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
275 htonl(0xffff), skb->nh.iph->saddr);
276 if (inet->cmsg_flags)
277 ip_cmsg_recv(msg, skb);
278 } else {
279 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
280
281 if (np->rxopt.all)
282 datagram_recv_ctl(sk, msg, skb);
283 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
284 sin6->sin6_scope_id = IP6CB(skb)->iif;
285 }
286 }
287
288 err = copied;
289 if (flags & MSG_TRUNC)
290 err = skb->len - sizeof(struct udphdr);
291
292 out_free:
293 skb_free_datagram(sk, skb);
294 out:
295 return err;
296
297 csum_copy_err:
298 /* Clear queue. */
299 if (flags&MSG_PEEK) {
300 int clear = 0;
301 spin_lock_irq(&sk->sk_receive_queue.lock);
302 if (skb == skb_peek(&sk->sk_receive_queue)) {
303 __skb_unlink(skb, &sk->sk_receive_queue);
304 clear = 1;
305 }
306 spin_unlock_irq(&sk->sk_receive_queue.lock);
307 if (clear)
308 kfree_skb(skb);
309 }
310
311 skb_free_datagram(sk, skb);
312
313 if (flags & MSG_DONTWAIT) {
314 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
315 return -EAGAIN;
316 }
317 goto try_again;
318 }
319
320 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
321 int type, int code, int offset, __u32 info)
322 {
323 struct ipv6_pinfo *np;
324 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
325 struct net_device *dev = skb->dev;
326 struct in6_addr *saddr = &hdr->saddr;
327 struct in6_addr *daddr = &hdr->daddr;
328 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
329 struct sock *sk;
330 int err;
331
332 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
333
334 if (sk == NULL)
335 return;
336
337 np = inet6_sk(sk);
338
339 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
340 goto out;
341
342 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
343 goto out;
344
345 if (np->recverr)
346 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
347
348 sk->sk_err = err;
349 sk->sk_error_report(sk);
350 out:
351 sock_put(sk);
352 }
353
354 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
355 {
356 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
357 kfree_skb(skb);
358 return -1;
359 }
360
361 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
362 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
363 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
364 kfree_skb(skb);
365 return 0;
366 }
367 skb->ip_summed = CHECKSUM_UNNECESSARY;
368 }
369
370 if (sock_queue_rcv_skb(sk,skb)<0) {
371 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
372 kfree_skb(skb);
373 return 0;
374 }
375 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
376 return 0;
377 }
378
379 static struct sock *udp_v6_mcast_next(struct sock *sk,
380 u16 loc_port, struct in6_addr *loc_addr,
381 u16 rmt_port, struct in6_addr *rmt_addr,
382 int dif)
383 {
384 struct hlist_node *node;
385 struct sock *s = sk;
386 unsigned short num = ntohs(loc_port);
387
388 sk_for_each_from(s, node) {
389 struct inet_opt *inet = inet_sk(s);
390
391 if (inet->num == num && s->sk_family == PF_INET6) {
392 struct ipv6_pinfo *np = inet6_sk(s);
393 if (inet->dport) {
394 if (inet->dport != rmt_port)
395 continue;
396 }
397 if (!ipv6_addr_any(&np->daddr) &&
398 ipv6_addr_cmp(&np->daddr, rmt_addr))
399 continue;
400
401 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
402 continue;
403
404 if (!ipv6_addr_any(&np->rcv_saddr)) {
405 if (!ipv6_addr_cmp(&np->rcv_saddr, loc_addr))
406 return s;
407 continue;
408 }
409 if(!inet6_mc_check(s, loc_addr, rmt_addr))
410 continue;
411 return s;
412 }
413 }
414 return NULL;
415 }
416
417 /*
418 * Note: called only from the BH handler context,
419 * so we don't need to lock the hashes.
420 */
421 static void udpv6_mcast_deliver(struct udphdr *uh,
422 struct in6_addr *saddr, struct in6_addr *daddr,
423 struct sk_buff *skb)
424 {
425 struct sock *sk, *sk2;
426 int dif;
427
428 read_lock(&udp_hash_lock);
429 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
430 dif = skb->dev->ifindex;
431 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
432 if (!sk) {
433 kfree_skb(skb);
434 goto out;
435 }
436
437 sk2 = sk;
438 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
439 uh->source, saddr, dif))) {
440 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
441 if (buff)
442 udpv6_queue_rcv_skb(sk2, buff);
443 }
444 udpv6_queue_rcv_skb(sk, skb);
445 out:
446 read_unlock(&udp_hash_lock);
447 }
448
449 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
450 {
451 struct sk_buff *skb = *pskb;
452 struct sock *sk;
453 struct udphdr *uh;
454 struct net_device *dev = skb->dev;
455 struct in6_addr *saddr, *daddr;
456 u32 ulen = 0;
457
458 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
459 goto short_packet;
460
461 saddr = &skb->nh.ipv6h->saddr;
462 daddr = &skb->nh.ipv6h->daddr;
463 uh = skb->h.uh;
464
465 ulen = ntohs(uh->len);
466
467 /* Check for jumbo payload */
468 if (ulen == 0)
469 ulen = skb->len;
470
471 if (ulen > skb->len || ulen < sizeof(*uh))
472 goto short_packet;
473
474 if (uh->check == 0) {
475 /* RFC 2460 section 8.1 says that we SHOULD log
476 this error. Well, it is reasonable.
477 */
478 LIMIT_NETDEBUG(
479 printk(KERN_INFO "IPv6: udp checksum is 0\n"));
480 goto discard;
481 }
482
483 if (ulen < skb->len) {
484 if (__pskb_trim(skb, ulen))
485 goto discard;
486 saddr = &skb->nh.ipv6h->saddr;
487 daddr = &skb->nh.ipv6h->daddr;
488 uh = skb->h.uh;
489 }
490
491 if (skb->ip_summed==CHECKSUM_HW) {
492 skb->ip_summed = CHECKSUM_UNNECESSARY;
493 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
494 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
495 skb->ip_summed = CHECKSUM_NONE;
496 }
497 }
498 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
499 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
500
501 /*
502 * Multicast receive code
503 */
504 if (ipv6_addr_is_multicast(daddr)) {
505 udpv6_mcast_deliver(uh, saddr, daddr, skb);
506 return 0;
507 }
508
509 /* Unicast */
510
511 /*
512 * check socket cache ... must talk to Alan about his plans
513 * for sock caches... i'll skip this for now.
514 */
515 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
516
517 if (sk == NULL) {
518 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
519 goto discard;
520
521 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
522 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
523 goto discard;
524 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
525
526 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
527
528 kfree_skb(skb);
529 return(0);
530 }
531
532 /* deliver */
533
534 udpv6_queue_rcv_skb(sk, skb);
535 sock_put(sk);
536 return(0);
537
538 short_packet:
539 if (net_ratelimit())
540 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
541
542 discard:
543 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
544 kfree_skb(skb);
545 return(0);
546 }
547 /*
548 * Throw away all pending data and cancel the corking. Socket is locked.
549 */
550 static void udp_v6_flush_pending_frames(struct sock *sk)
551 {
552 struct udp_opt *up = udp_sk(sk);
553
554 if (up->pending) {
555 up->len = 0;
556 up->pending = 0;
557 ip6_flush_pending_frames(sk);
558 }
559 }
560
561 /*
562 * Sending
563 */
564
565 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_opt *up)
566 {
567 struct sk_buff *skb;
568 struct udphdr *uh;
569 struct inet_opt *inet = inet_sk(sk);
570 struct flowi *fl = &inet->cork.fl;
571 int err = 0;
572
573 /* Grab the skbuff where UDP header space exists. */
574 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
575 goto out;
576
577 /*
578 * Create a UDP header
579 */
580 uh = skb->h.uh;
581 uh->source = fl->fl_ip_sport;
582 uh->dest = fl->fl_ip_dport;
583 uh->len = htons(up->len);
584 uh->check = 0;
585
586 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
587 skb->ip_summed = CHECKSUM_NONE;
588 goto send;
589 }
590
591 if (skb_queue_len(&sk->sk_write_queue) == 1) {
592 skb->csum = csum_partial((char *)uh,
593 sizeof(struct udphdr), skb->csum);
594 uh->check = csum_ipv6_magic(&fl->fl6_src,
595 &fl->fl6_dst,
596 up->len, fl->proto, skb->csum);
597 } else {
598 u32 tmp_csum = 0;
599
600 skb_queue_walk(&sk->sk_write_queue, skb) {
601 tmp_csum = csum_add(tmp_csum, skb->csum);
602 }
603 tmp_csum = csum_partial((char *)uh,
604 sizeof(struct udphdr), tmp_csum);
605 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
606 &fl->fl6_dst,
607 up->len, fl->proto, tmp_csum);
608 uh->check = tmp_csum;
609
610 }
611 if (uh->check == 0)
612 uh->check = -1;
613
614 send:
615 err = ip6_push_pending_frames(sk);
616 out:
617 up->len = 0;
618 up->pending = 0;
619 return err;
620 }
621
622 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
623 struct msghdr *msg, size_t len)
624 {
625 struct ipv6_txoptions opt_space;
626 struct udp_opt *up = udp_sk(sk);
627 struct inet_opt *inet = inet_sk(sk);
628 struct ipv6_pinfo *np = inet6_sk(sk);
629 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
630 struct in6_addr *daddr, *final_p = NULL, final;
631 struct ipv6_txoptions *opt = NULL;
632 struct ip6_flowlabel *flowlabel = NULL;
633 struct flowi *fl = &inet->cork.fl;
634 struct dst_entry *dst;
635 int addr_len = msg->msg_namelen;
636 int ulen = len;
637 int hlimit = -1;
638 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
639 int err;
640
641 /* destination address check */
642 if (sin6) {
643 if (addr_len < offsetof(struct sockaddr, sa_data))
644 return -EINVAL;
645
646 switch (sin6->sin6_family) {
647 case AF_INET6:
648 if (addr_len < SIN6_LEN_RFC2133)
649 return -EINVAL;
650 daddr = &sin6->sin6_addr;
651 break;
652 case AF_INET:
653 goto do_udp_sendmsg;
654 case AF_UNSPEC:
655 msg->msg_name = sin6 = NULL;
656 msg->msg_namelen = addr_len = 0;
657 daddr = NULL;
658 break;
659 default:
660 return -EINVAL;
661 }
662 } else if (!up->pending) {
663 if (sk->sk_state != TCP_ESTABLISHED)
664 return -EDESTADDRREQ;
665 daddr = &np->daddr;
666 } else
667 daddr = NULL;
668
669 if (daddr) {
670 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
671 struct sockaddr_in sin;
672 sin.sin_family = AF_INET;
673 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
674 sin.sin_addr.s_addr = daddr->s6_addr32[3];
675 msg->msg_name = &sin;
676 msg->msg_namelen = sizeof(sin);
677 do_udp_sendmsg:
678 if (__ipv6_only_sock(sk))
679 return -ENETUNREACH;
680 return udp_sendmsg(iocb, sk, msg, len);
681 }
682 }
683
684 if (up->pending == AF_INET)
685 return udp_sendmsg(iocb, sk, msg, len);
686
687 /* Rough check on arithmetic overflow,
688 better check is made in ip6_build_xmit
689 */
690 if (len > INT_MAX - sizeof(struct udphdr))
691 return -EMSGSIZE;
692
693 if (up->pending) {
694 /*
695 * There are pending frames.
696 * The socket lock must be held while it's corked.
697 */
698 lock_sock(sk);
699 if (likely(up->pending)) {
700 if (unlikely(up->pending != AF_INET6)) {
701 release_sock(sk);
702 return -EINVAL;
703 }
704 dst = NULL;
705 goto do_append_data;
706 }
707 release_sock(sk);
708 }
709 ulen += sizeof(struct udphdr);
710
711 memset(fl, 0, sizeof(*fl));
712
713 if (sin6) {
714 if (sin6->sin6_port == 0)
715 return -EINVAL;
716
717 fl->fl_ip_dport = sin6->sin6_port;
718 daddr = &sin6->sin6_addr;
719
720 if (np->sndflow) {
721 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
722 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
723 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
724 if (flowlabel == NULL)
725 return -EINVAL;
726 daddr = &flowlabel->dst;
727 }
728 }
729
730 /*
731 * Otherwise it will be difficult to maintain
732 * sk->sk_dst_cache.
733 */
734 if (sk->sk_state == TCP_ESTABLISHED &&
735 !ipv6_addr_cmp(daddr, &np->daddr))
736 daddr = &np->daddr;
737
738 if (addr_len >= sizeof(struct sockaddr_in6) &&
739 sin6->sin6_scope_id &&
740 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
741 fl->oif = sin6->sin6_scope_id;
742 } else {
743 if (sk->sk_state != TCP_ESTABLISHED)
744 return -EDESTADDRREQ;
745
746 fl->fl_ip_dport = inet->dport;
747 daddr = &np->daddr;
748 fl->fl6_flowlabel = np->flow_label;
749 }
750
751 if (!fl->oif)
752 fl->oif = sk->sk_bound_dev_if;
753
754 if (msg->msg_controllen) {
755 opt = &opt_space;
756 memset(opt, 0, sizeof(struct ipv6_txoptions));
757 opt->tot_len = sizeof(*opt);
758
759 err = datagram_send_ctl(msg, fl, opt, &hlimit);
760 if (err < 0) {
761 fl6_sock_release(flowlabel);
762 return err;
763 }
764 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
765 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
766 if (flowlabel == NULL)
767 return -EINVAL;
768 }
769 if (!(opt->opt_nflen|opt->opt_flen))
770 opt = NULL;
771 }
772 if (opt == NULL)
773 opt = np->opt;
774 if (flowlabel)
775 opt = fl6_merge_options(&opt_space, flowlabel, opt);
776
777 fl->proto = IPPROTO_UDP;
778 ipv6_addr_copy(&fl->fl6_dst, daddr);
779 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
780 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
781 fl->fl_ip_sport = inet->sport;
782
783 /* merge ip6_build_xmit from ip6_output */
784 if (opt && opt->srcrt) {
785 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
786 ipv6_addr_copy(&final, &fl->fl6_dst);
787 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
788 final_p = &final;
789 }
790
791 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
792 fl->oif = np->mcast_oif;
793
794 err = ip6_dst_lookup(sk, &dst, fl);
795 if (err)
796 goto out;
797 if (final_p)
798 ipv6_addr_copy(&fl->fl6_dst, final_p);
799
800 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
801 dst_release(dst);
802 goto out;
803 }
804
805 if (hlimit < 0) {
806 if (ipv6_addr_is_multicast(&fl->fl6_dst))
807 hlimit = np->mcast_hops;
808 else
809 hlimit = np->hop_limit;
810 if (hlimit < 0)
811 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
812 }
813
814 if (msg->msg_flags&MSG_CONFIRM)
815 goto do_confirm;
816 back_from_confirm:
817
818 lock_sock(sk);
819 if (unlikely(up->pending)) {
820 /* The socket is already corked while preparing it. */
821 /* ... which is an evident application bug. --ANK */
822 release_sock(sk);
823
824 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
825 err = -EINVAL;
826 goto out;
827 }
828
829 up->pending = AF_INET6;
830
831 do_append_data:
832 up->len += ulen;
833 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
834 hlimit, opt, fl, (struct rt6_info*)dst,
835 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
836 if (err)
837 udp_v6_flush_pending_frames(sk);
838 else if (!corkreq)
839 err = udp_v6_push_pending_frames(sk, up);
840
841 if (dst)
842 ip6_dst_store(sk, dst,
843 !ipv6_addr_cmp(&fl->fl6_dst, &np->daddr) ?
844 &np->daddr : NULL);
845 if (err > 0)
846 err = np->recverr ? net_xmit_errno(err) : 0;
847 release_sock(sk);
848 out:
849 fl6_sock_release(flowlabel);
850 if (!err) {
851 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
852 return len;
853 }
854 return err;
855
856 do_confirm:
857 dst_confirm(dst);
858 if (!(msg->msg_flags&MSG_PROBE) || len)
859 goto back_from_confirm;
860 err = 0;
861 goto out;
862 }
863
864 static int udpv6_destroy_sock(struct sock *sk)
865 {
866 lock_sock(sk);
867 udp_v6_flush_pending_frames(sk);
868 release_sock(sk);
869
870 inet6_destroy_sock(sk);
871
872 return 0;
873 }
874
875 /*
876 * Socket option code for UDP
877 */
878 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
879 char __user *optval, int optlen)
880 {
881 struct udp_opt *up = udp_sk(sk);
882 int val;
883 int err = 0;
884
885 if (level != SOL_UDP)
886 return ipv6_setsockopt(sk, level, optname, optval, optlen);
887
888 if(optlen<sizeof(int))
889 return -EINVAL;
890
891 if (get_user(val, (int __user *)optval))
892 return -EFAULT;
893
894 switch(optname) {
895 case UDP_CORK:
896 if (val != 0) {
897 up->corkflag = 1;
898 } else {
899 up->corkflag = 0;
900 lock_sock(sk);
901 udp_v6_push_pending_frames(sk, up);
902 release_sock(sk);
903 }
904 break;
905
906 case UDP_ENCAP:
907 switch (val) {
908 case 0:
909 up->encap_type = val;
910 break;
911 default:
912 err = -ENOPROTOOPT;
913 break;
914 }
915 break;
916
917 default:
918 err = -ENOPROTOOPT;
919 break;
920 };
921
922 return err;
923 }
924
925 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
926 char __user *optval, int __user *optlen)
927 {
928 struct udp_opt *up = udp_sk(sk);
929 int val, len;
930
931 if (level != SOL_UDP)
932 return ipv6_getsockopt(sk, level, optname, optval, optlen);
933
934 if(get_user(len,optlen))
935 return -EFAULT;
936
937 len = min_t(unsigned int, len, sizeof(int));
938
939 if(len < 0)
940 return -EINVAL;
941
942 switch(optname) {
943 case UDP_CORK:
944 val = up->corkflag;
945 break;
946
947 case UDP_ENCAP:
948 val = up->encap_type;
949 break;
950
951 default:
952 return -ENOPROTOOPT;
953 };
954
955 if(put_user(len, optlen))
956 return -EFAULT;
957 if(copy_to_user(optval, &val,len))
958 return -EFAULT;
959 return 0;
960 }
961
962 static struct inet6_protocol udpv6_protocol = {
963 .handler = udpv6_rcv,
964 .err_handler = udpv6_err,
965 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
966 };
967
968 /* ------------------------------------------------------------------------ */
969 #ifdef CONFIG_PROC_FS
970
971 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
972 {
973 struct inet_opt *inet = inet_sk(sp);
974 struct ipv6_pinfo *np = inet6_sk(sp);
975 struct in6_addr *dest, *src;
976 __u16 destp, srcp;
977
978 dest = &np->daddr;
979 src = &np->rcv_saddr;
980 destp = ntohs(inet->dport);
981 srcp = ntohs(inet->sport);
982 seq_printf(seq,
983 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
984 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
985 bucket,
986 src->s6_addr32[0], src->s6_addr32[1],
987 src->s6_addr32[2], src->s6_addr32[3], srcp,
988 dest->s6_addr32[0], dest->s6_addr32[1],
989 dest->s6_addr32[2], dest->s6_addr32[3], destp,
990 sp->sk_state,
991 atomic_read(&sp->sk_wmem_alloc),
992 atomic_read(&sp->sk_rmem_alloc),
993 0, 0L, 0,
994 sock_i_uid(sp), 0,
995 sock_i_ino(sp),
996 atomic_read(&sp->sk_refcnt), sp);
997 }
998
999 static int udp6_seq_show(struct seq_file *seq, void *v)
1000 {
1001 if (v == SEQ_START_TOKEN)
1002 seq_printf(seq,
1003 " sl "
1004 "local_address "
1005 "remote_address "
1006 "st tx_queue rx_queue tr tm->when retrnsmt"
1007 " uid timeout inode\n");
1008 else
1009 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1010 return 0;
1011 }
1012
1013 static struct file_operations udp6_seq_fops;
1014 static struct udp_seq_afinfo udp6_seq_afinfo = {
1015 .owner = THIS_MODULE,
1016 .name = "udp6",
1017 .family = AF_INET6,
1018 .seq_show = udp6_seq_show,
1019 .seq_fops = &udp6_seq_fops,
1020 };
1021
1022 int __init udp6_proc_init(void)
1023 {
1024 return udp_proc_register(&udp6_seq_afinfo);
1025 }
1026
1027 void udp6_proc_exit(void) {
1028 udp_proc_unregister(&udp6_seq_afinfo);
1029 }
1030 #endif /* CONFIG_PROC_FS */
1031
1032 /* ------------------------------------------------------------------------ */
1033
1034 struct proto udpv6_prot = {
1035 .name = "UDP",
1036 .close = udpv6_close,
1037 .connect = ip6_datagram_connect,
1038 .disconnect = udp_disconnect,
1039 .ioctl = udp_ioctl,
1040 .destroy = udpv6_destroy_sock,
1041 .setsockopt = udpv6_setsockopt,
1042 .getsockopt = udpv6_getsockopt,
1043 .sendmsg = udpv6_sendmsg,
1044 .recvmsg = udpv6_recvmsg,
1045 .backlog_rcv = udpv6_queue_rcv_skb,
1046 .hash = udp_v6_hash,
1047 .unhash = udp_v6_unhash,
1048 .get_port = udp_v6_get_port,
1049 .slab_obj_size = sizeof(struct udp6_sock),
1050 };
1051
1052 extern struct proto_ops inet6_dgram_ops;
1053
1054 static struct inet_protosw udpv6_protosw = {
1055 .type = SOCK_DGRAM,
1056 .protocol = IPPROTO_UDP,
1057 .prot = &udpv6_prot,
1058 .ops = &inet6_dgram_ops,
1059 .capability =-1,
1060 .no_check = UDP_CSUM_DEFAULT,
1061 .flags = INET_PROTOSW_PERMANENT,
1062 };
1063
1064
1065 void __init udpv6_init(void)
1066 {
1067 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1068 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1069 inet6_register_protosw(&udpv6_protosw);
1070 }
MOXA 2.6.9 from sdlinux-moxaart.tgz