]> bbs.cooldavid.org Git - net-next-2.6.git/blame - net/ipv6/udp.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[DCCP]: Introduce dccp_ipv4_af_ops
[net-next-2.6.git] / net / ipv6 / udp.c
CommitLineData
1da177e4
LT		 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>
c752f073 54#include <net/tcp_states.h>
1da177e4
LT		 55
56#include <net/ip6_checksum.h>
57#include <net/xfrm.h>
58
59#include <linux/proc_fs.h>
60#include <linux/seq_file.h>
61
ba89966c 62DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
1da177e4
LT		 63
64/* Grrr, addr_type already calculated by caller, but I don't want
65 * to add some silly "cookie" argument to this method just for that.
66 */
67static int udp_v6_get_port(struct sock *sk, unsigned short snum)
68{
69 struct sock *sk2;
70 struct hlist_node *node;
71
72 write_lock_bh(&udp_hash_lock);
73 if (snum == 0) {
74 int best_size_so_far, best, result, i;
75
76 if (udp_port_rover > sysctl_local_port_range[1] ||
77 udp_port_rover < sysctl_local_port_range[0])
78 udp_port_rover = sysctl_local_port_range[0];
79 best_size_so_far = 32767;
80 best = result = udp_port_rover;
81 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
82 int size;
83 struct hlist_head *list;
84
85 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
86 if (hlist_empty(list)) {
87 if (result > sysctl_local_port_range[1])
88 result = sysctl_local_port_range[0] +
89 ((result - sysctl_local_port_range[0]) &
90 (UDP_HTABLE_SIZE - 1));
91 goto gotit;
92 }
93 size = 0;
94 sk_for_each(sk2, node, list)
95 if (++size >= best_size_so_far)
96 goto next;
97 best_size_so_far = size;
98 best = result;
99 next:;
100 }
101 result = best;
87bf9c97 102 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
1da177e4
LT		 103 if (result > sysctl_local_port_range[1])
104 result = sysctl_local_port_range[0]
105 + ((result - sysctl_local_port_range[0]) &
106 (UDP_HTABLE_SIZE - 1));
107 if (!udp_lport_inuse(result))
108 break;
109 }
87bf9c97
YH		 110 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
111 goto fail;
1da177e4
LT		 112gotit:
113 udp_port_rover = snum = result;
114 } else {
115 sk_for_each(sk2, node,
116 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
117 if (inet_sk(sk2)->num == snum &&
118 sk2 != sk &&
119 (!sk2->sk_bound_dev_if ||
120 !sk->sk_bound_dev_if ||
121 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
122 (!sk2->sk_reuse || !sk->sk_reuse) &&
123 ipv6_rcv_saddr_equal(sk, sk2))
124 goto fail;
125 }
126 }
127
128 inet_sk(sk)->num = snum;
129 if (sk_unhashed(sk)) {
130 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
131 sock_prot_inc_use(sk->sk_prot);
132 }
133 write_unlock_bh(&udp_hash_lock);
134 return 0;
135
136fail:
137 write_unlock_bh(&udp_hash_lock);
138 return 1;
139}
140
141static void udp_v6_hash(struct sock *sk)
142{
143 BUG();
144}
145
146static void udp_v6_unhash(struct sock *sk)
147{
148 write_lock_bh(&udp_hash_lock);
149 if (sk_del_node_init(sk)) {
150 inet_sk(sk)->num = 0;
151 sock_prot_dec_use(sk->sk_prot);
152 }
153 write_unlock_bh(&udp_hash_lock);
154}
155
156static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
157 struct in6_addr *daddr, u16 dport, int dif)
158{
159 struct sock *sk, *result = NULL;
160 struct hlist_node *node;
161 unsigned short hnum = ntohs(dport);
162 int badness = -1;
163
164 read_lock(&udp_hash_lock);
165 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
166 struct inet_sock *inet = inet_sk(sk);
167
168 if (inet->num == hnum && sk->sk_family == PF_INET6) {
169 struct ipv6_pinfo *np = inet6_sk(sk);
170 int score = 0;
171 if (inet->dport) {
172 if (inet->dport != sport)
173 continue;
174 score++;
175 }
176 if (!ipv6_addr_any(&np->rcv_saddr)) {
177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
178 continue;
179 score++;
180 }
181 if (!ipv6_addr_any(&np->daddr)) {
182 if (!ipv6_addr_equal(&np->daddr, saddr))
183 continue;
184 score++;
185 }
186 if (sk->sk_bound_dev_if) {
187 if (sk->sk_bound_dev_if != dif)
188 continue;
189 score++;
190 }
191 if(score == 4) {
192 result = sk;
193 break;
194 } else if(score > badness) {
195 result = sk;
196 badness = score;
197 }
198 }
199 }
200 if (result)
201 sock_hold(result);
202 read_unlock(&udp_hash_lock);
203 return result;
204}
205
206/*
207 *
208 */
209
210static void udpv6_close(struct sock *sk, long timeout)
211{
212 sk_common_release(sk);
213}
214
215/*
216 * This should be easy, if there is something there we
217 * return it, otherwise we block.
218 */
219
220static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
221 struct msghdr *msg, size_t len,
222 int noblock, int flags, int *addr_len)
223{
224 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct inet_sock *inet = inet_sk(sk);
226 struct sk_buff *skb;
227 size_t copied;
228 int err;
229
230 if (addr_len)
231 *addr_len=sizeof(struct sockaddr_in6);
232
233 if (flags & MSG_ERRQUEUE)
234 return ipv6_recv_error(sk, msg, len);
235
236try_again:
237 skb = skb_recv_datagram(sk, flags, noblock, &err);
238 if (!skb)
239 goto out;
240
241 copied = skb->len - sizeof(struct udphdr);
242 if (copied > len) {
243 copied = len;
244 msg->msg_flags |= MSG_TRUNC;
245 }
246
247 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
248 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
249 copied);
250 } else if (msg->msg_flags&MSG_TRUNC) {
fb286bb2 251 if (__skb_checksum_complete(skb))
1da177e4
LT		 252 goto csum_copy_err;
253 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
254 copied);
255 } else {
256 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
257 if (err == -EINVAL)
258 goto csum_copy_err;
259 }
260 if (err)
261 goto out_free;
262
263 sock_recv_timestamp(msg, sk, skb);
264
265 /* Copy the address. */
266 if (msg->msg_name) {
267 struct sockaddr_in6 *sin6;
268
269 sin6 = (struct sockaddr_in6 *) msg->msg_name;
270 sin6->sin6_family = AF_INET6;
271 sin6->sin6_port = skb->h.uh->source;
272 sin6->sin6_flowinfo = 0;
273 sin6->sin6_scope_id = 0;
274
275 if (skb->protocol == htons(ETH_P_IP))
276 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
277 htonl(0xffff), skb->nh.iph->saddr);
278 else {
279 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
280 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
281 sin6->sin6_scope_id = IP6CB(skb)->iif;
282 }
283
284 }
285 if (skb->protocol == htons(ETH_P_IP)) {
286 if (inet->cmsg_flags)
287 ip_cmsg_recv(msg, skb);
288 } else {
289 if (np->rxopt.all)
290 datagram_recv_ctl(sk, msg, skb);
291 }
292
293 err = copied;
294 if (flags & MSG_TRUNC)
295 err = skb->len - sizeof(struct udphdr);
296
297out_free:
298 skb_free_datagram(sk, skb);
299out:
300 return err;
301
302csum_copy_err:
303 /* Clear queue. */
304 if (flags&MSG_PEEK) {
305 int clear = 0;
e0f9f858 306 spin_lock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 307 if (skb == skb_peek(&sk->sk_receive_queue)) {
308 __skb_unlink(skb, &sk->sk_receive_queue);
309 clear = 1;
310 }
e0f9f858 311 spin_unlock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 312 if (clear)
313 kfree_skb(skb);
314 }
315
316 skb_free_datagram(sk, skb);
317
318 if (flags & MSG_DONTWAIT) {
319 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
320 return -EAGAIN;
321 }
322 goto try_again;
323}
324
325static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
326 int type, int code, int offset, __u32 info)
327{
328 struct ipv6_pinfo *np;
329 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
330 struct net_device *dev = skb->dev;
331 struct in6_addr *saddr = &hdr->saddr;
332 struct in6_addr *daddr = &hdr->daddr;
333 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
334 struct sock *sk;
335 int err;
336
337 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
338
339 if (sk == NULL)
340 return;
341
342 np = inet6_sk(sk);
343
344 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
345 goto out;
346
347 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
348 goto out;
349
350 if (np->recverr)
351 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
352
353 sk->sk_err = err;
354 sk->sk_error_report(sk);
355out:
356 sock_put(sk);
357}
358
359static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
360{
361 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
362 kfree_skb(skb);
363 return -1;
364 }
365
fb286bb2
HX		 366 if (skb_checksum_complete(skb)) {
367 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
368 kfree_skb(skb);
369 return 0;
1da177e4
LT		 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
381static 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)) {
40796c5e
DS		 407 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
408 continue;
1da177e4
LT		 409 }
410 if(!inet6_mc_check(s, loc_addr, rmt_addr))
411 continue;
412 return s;
413 }
414 }
415 return NULL;
416}
417
418/*
419 * Note: called only from the BH handler context,
420 * so we don't need to lock the hashes.
421 */
422static void udpv6_mcast_deliver(struct udphdr *uh,
423 struct in6_addr *saddr, struct in6_addr *daddr,
424 struct sk_buff *skb)
425{
426 struct sock *sk, *sk2;
427 int dif;
428
429 read_lock(&udp_hash_lock);
430 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
431 dif = skb->dev->ifindex;
432 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
433 if (!sk) {
434 kfree_skb(skb);
435 goto out;
436 }
437
438 sk2 = sk;
439 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
440 uh->source, saddr, dif))) {
441 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
442 if (buff)
443 udpv6_queue_rcv_skb(sk2, buff);
444 }
445 udpv6_queue_rcv_skb(sk, skb);
446out:
447 read_unlock(&udp_hash_lock);
448}
449
450static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
451{
452 struct sk_buff *skb = *pskb;
453 struct sock *sk;
454 struct udphdr *uh;
455 struct net_device *dev = skb->dev;
456 struct in6_addr *saddr, *daddr;
457 u32 ulen = 0;
458
459 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
460 goto short_packet;
461
462 saddr = &skb->nh.ipv6h->saddr;
463 daddr = &skb->nh.ipv6h->daddr;
464 uh = skb->h.uh;
465
466 ulen = ntohs(uh->len);
467
468 /* Check for jumbo payload */
469 if (ulen == 0)
470 ulen = skb->len;
471
472 if (ulen > skb->len || ulen < sizeof(*uh))
473 goto short_packet;
474
475 if (uh->check == 0) {
476 /* RFC 2460 section 8.1 says that we SHOULD log
477 this error. Well, it is reasonable.
478 */
64ce2073 479 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
1da177e4
LT		 480 goto discard;
481 }
482
483 if (ulen < skb->len) {
42ca89c1 484 if (pskb_trim_rcsum(skb, ulen))
1da177e4
LT		 485 goto discard;
486 saddr = &skb->nh.ipv6h->saddr;
487 daddr = &skb->nh.ipv6h->daddr;
488 uh = skb->h.uh;
489 }
490
fb286bb2
HX		 491 if (skb->ip_summed == CHECKSUM_HW &&
492 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
1da177e4 493 skb->ip_summed = CHECKSUM_UNNECESSARY;
fb286bb2 494
1da177e4
LT		 495 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
496 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
497
498 /*
499 * Multicast receive code
500 */
501 if (ipv6_addr_is_multicast(daddr)) {
502 udpv6_mcast_deliver(uh, saddr, daddr, skb);
503 return 0;
504 }
505
506 /* Unicast */
507
508 /*
509 * check socket cache ... must talk to Alan about his plans
510 * for sock caches... i'll skip this for now.
511 */
512 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
513
514 if (sk == NULL) {
515 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
516 goto discard;
517
fb286bb2 518 if (skb_checksum_complete(skb))
1da177e4
LT		 519 goto discard;
520 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
521
522 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
523
524 kfree_skb(skb);
525 return(0);
526 }
527
528 /* deliver */
529
530 udpv6_queue_rcv_skb(sk, skb);
531 sock_put(sk);
532 return(0);
533
534short_packet:
535 if (net_ratelimit())
536 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
537
538discard:
539 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
540 kfree_skb(skb);
541 return(0);
542}
543/*
544 * Throw away all pending data and cancel the corking. Socket is locked.
545 */
546static void udp_v6_flush_pending_frames(struct sock *sk)
547{
548 struct udp_sock *up = udp_sk(sk);
549
550 if (up->pending) {
551 up->len = 0;
552 up->pending = 0;
553 ip6_flush_pending_frames(sk);
554 }
555}
556
557/*
558 * Sending
559 */
560
561static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
562{
563 struct sk_buff *skb;
564 struct udphdr *uh;
565 struct inet_sock *inet = inet_sk(sk);
566 struct flowi *fl = &inet->cork.fl;
567 int err = 0;
568
569 /* Grab the skbuff where UDP header space exists. */
570 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
571 goto out;
572
573 /*
574 * Create a UDP header
575 */
576 uh = skb->h.uh;
577 uh->source = fl->fl_ip_sport;
578 uh->dest = fl->fl_ip_dport;
579 uh->len = htons(up->len);
580 uh->check = 0;
581
582 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
583 skb->ip_summed = CHECKSUM_NONE;
584 goto send;
585 }
586
587 if (skb_queue_len(&sk->sk_write_queue) == 1) {
588 skb->csum = csum_partial((char *)uh,
589 sizeof(struct udphdr), skb->csum);
590 uh->check = csum_ipv6_magic(&fl->fl6_src,
591 &fl->fl6_dst,
592 up->len, fl->proto, skb->csum);
593 } else {
594 u32 tmp_csum = 0;
595
596 skb_queue_walk(&sk->sk_write_queue, skb) {
597 tmp_csum = csum_add(tmp_csum, skb->csum);
598 }
599 tmp_csum = csum_partial((char *)uh,
600 sizeof(struct udphdr), tmp_csum);
601 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
602 &fl->fl6_dst,
603 up->len, fl->proto, tmp_csum);
604 uh->check = tmp_csum;
605
606 }
607 if (uh->check == 0)
608 uh->check = -1;
609
610send:
611 err = ip6_push_pending_frames(sk);
612out:
613 up->len = 0;
614 up->pending = 0;
615 return err;
616}
617
618static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
619 struct msghdr *msg, size_t len)
620{
621 struct ipv6_txoptions opt_space;
622 struct udp_sock *up = udp_sk(sk);
623 struct inet_sock *inet = inet_sk(sk);
624 struct ipv6_pinfo *np = inet6_sk(sk);
625 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
626 struct in6_addr *daddr, *final_p = NULL, final;
627 struct ipv6_txoptions *opt = NULL;
628 struct ip6_flowlabel *flowlabel = NULL;
629 struct flowi *fl = &inet->cork.fl;
630 struct dst_entry *dst;
631 int addr_len = msg->msg_namelen;
632 int ulen = len;
633 int hlimit = -1;
41a1f8ea 634 int tclass = -1;
1da177e4
LT		 635 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
636 int err;
987905de 637 int connected = 0;
1da177e4
LT		 638
639 /* destination address check */
640 if (sin6) {
641 if (addr_len < offsetof(struct sockaddr, sa_data))
642 return -EINVAL;
643
644 switch (sin6->sin6_family) {
645 case AF_INET6:
646 if (addr_len < SIN6_LEN_RFC2133)
647 return -EINVAL;
648 daddr = &sin6->sin6_addr;
649 break;
650 case AF_INET:
651 goto do_udp_sendmsg;
652 case AF_UNSPEC:
653 msg->msg_name = sin6 = NULL;
654 msg->msg_namelen = addr_len = 0;
655 daddr = NULL;
656 break;
657 default:
658 return -EINVAL;
659 }
660 } else if (!up->pending) {
661 if (sk->sk_state != TCP_ESTABLISHED)
662 return -EDESTADDRREQ;
663 daddr = &np->daddr;
664 } else
665 daddr = NULL;
666
667 if (daddr) {
668 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
669 struct sockaddr_in sin;
670 sin.sin_family = AF_INET;
671 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
672 sin.sin_addr.s_addr = daddr->s6_addr32[3];
673 msg->msg_name = &sin;
674 msg->msg_namelen = sizeof(sin);
675do_udp_sendmsg:
676 if (__ipv6_only_sock(sk))
677 return -ENETUNREACH;
678 return udp_sendmsg(iocb, sk, msg, len);
679 }
680 }
681
682 if (up->pending == AF_INET)
683 return udp_sendmsg(iocb, sk, msg, len);
684
685 /* Rough check on arithmetic overflow,
686 better check is made in ip6_build_xmit
687 */
688 if (len > INT_MAX - sizeof(struct udphdr))
689 return -EMSGSIZE;
690
691 if (up->pending) {
692 /*
693 * There are pending frames.
694 * The socket lock must be held while it's corked.
695 */
696 lock_sock(sk);
697 if (likely(up->pending)) {
698 if (unlikely(up->pending != AF_INET6)) {
699 release_sock(sk);
700 return -EAFNOSUPPORT;
701 }
702 dst = NULL;
703 goto do_append_data;
704 }
705 release_sock(sk);
706 }
707 ulen += sizeof(struct udphdr);
708
709 memset(fl, 0, sizeof(*fl));
710
711 if (sin6) {
712 if (sin6->sin6_port == 0)
713 return -EINVAL;
714
715 fl->fl_ip_dport = sin6->sin6_port;
716 daddr = &sin6->sin6_addr;
717
718 if (np->sndflow) {
719 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
720 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
721 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
722 if (flowlabel == NULL)
723 return -EINVAL;
724 daddr = &flowlabel->dst;
725 }
726 }
727
728 /*
729 * Otherwise it will be difficult to maintain
730 * sk->sk_dst_cache.
731 */
732 if (sk->sk_state == TCP_ESTABLISHED &&
733 ipv6_addr_equal(daddr, &np->daddr))
734 daddr = &np->daddr;
735
736 if (addr_len >= sizeof(struct sockaddr_in6) &&
737 sin6->sin6_scope_id &&
738 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
739 fl->oif = sin6->sin6_scope_id;
740 } else {
741 if (sk->sk_state != TCP_ESTABLISHED)
742 return -EDESTADDRREQ;
743
744 fl->fl_ip_dport = inet->dport;
745 daddr = &np->daddr;
746 fl->fl6_flowlabel = np->flow_label;
987905de 747 connected = 1;
1da177e4
LT		 748 }
749
750 if (!fl->oif)
751 fl->oif = sk->sk_bound_dev_if;
752
753 if (msg->msg_controllen) {
754 opt = &opt_space;
755 memset(opt, 0, sizeof(struct ipv6_txoptions));
756 opt->tot_len = sizeof(*opt);
757
41a1f8ea 758 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
1da177e4
LT		 759 if (err < 0) {
760 fl6_sock_release(flowlabel);
761 return err;
762 }
763 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
764 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
765 if (flowlabel == NULL)
766 return -EINVAL;
767 }
768 if (!(opt->opt_nflen|opt->opt_flen))
769 opt = NULL;
987905de 770 connected = 0;
1da177e4
LT		 771 }
772 if (opt == NULL)
773 opt = np->opt;
df9890c3
YH		 774 if (flowlabel)
775 opt = fl6_merge_options(&opt_space, flowlabel, opt);
776 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4
LT		 777
778 fl->proto = IPPROTO_UDP;
779 ipv6_addr_copy(&fl->fl6_dst, daddr);
780 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
781 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
782 fl->fl_ip_sport = inet->sport;
783
784 /* merge ip6_build_xmit from ip6_output */
785 if (opt && opt->srcrt) {
786 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
787 ipv6_addr_copy(&final, &fl->fl6_dst);
788 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
789 final_p = &final;
987905de 790 connected = 0;
1da177e4
LT		 791 }
792
987905de 793 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
1da177e4 794 fl->oif = np->mcast_oif;
987905de
MK		 795 connected = 0;
796 }
1da177e4
LT		 797
798 err = ip6_dst_lookup(sk, &dst, fl);
799 if (err)
800 goto out;
801 if (final_p)
802 ipv6_addr_copy(&fl->fl6_dst, final_p);
803
e104411b 804 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
1da177e4 805 goto out;
1da177e4
LT		 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
41a1f8ea
YH		 818 if (tclass < 0) {
819 tclass = np->tclass;
820 if (tclass < 0)
821 tclass = 0;
822 }
823
1da177e4
LT		 824 if (msg->msg_flags&MSG_CONFIRM)
825 goto do_confirm;
826back_from_confirm:
827
828 lock_sock(sk);
829 if (unlikely(up->pending)) {
830 /* The socket is already corked while preparing it. */
831 /* ... which is an evident application bug. --ANK */
832 release_sock(sk);
833
64ce2073 834 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 835 err = -EINVAL;
836 goto out;
837 }
838
839 up->pending = AF_INET6;
840
841do_append_data:
842 up->len += ulen;
41a1f8ea
YH		 843 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
844 sizeof(struct udphdr), hlimit, tclass, opt, fl,
845 (struct rt6_info*)dst,
846 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1da177e4
LT		 847 if (err)
848 udp_v6_flush_pending_frames(sk);
849 else if (!corkreq)
850 err = udp_v6_push_pending_frames(sk, up);
851
a5e7c210
DM		 852 if (dst) {
853 if (connected) {
854 ip6_dst_store(sk, dst,
855 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
856 &np->daddr : NULL);
857 } else {
858 dst_release(dst);
859 }
860 }
861
1da177e4
LT		 862 if (err > 0)
863 err = np->recverr ? net_xmit_errno(err) : 0;
864 release_sock(sk);
865out:
866 fl6_sock_release(flowlabel);
867 if (!err) {
868 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
869 return len;
870 }
871 return err;
872
873do_confirm:
874 dst_confirm(dst);
875 if (!(msg->msg_flags&MSG_PROBE) || len)
876 goto back_from_confirm;
877 err = 0;
878 goto out;
879}
880
881static int udpv6_destroy_sock(struct sock *sk)
882{
883 lock_sock(sk);
884 udp_v6_flush_pending_frames(sk);
885 release_sock(sk);
886
887 inet6_destroy_sock(sk);
888
889 return 0;
890}
891
892/*
893 * Socket option code for UDP
894 */
895static int udpv6_setsockopt(struct sock *sk, int level, int optname,
896 char __user *optval, int optlen)
897{
898 struct udp_sock *up = udp_sk(sk);
899 int val;
900 int err = 0;
901
902 if (level != SOL_UDP)
903 return ipv6_setsockopt(sk, level, optname, optval, optlen);
904
905 if(optlen<sizeof(int))
906 return -EINVAL;
907
908 if (get_user(val, (int __user *)optval))
909 return -EFAULT;
910
911 switch(optname) {
912 case UDP_CORK:
913 if (val != 0) {
914 up->corkflag = 1;
915 } else {
916 up->corkflag = 0;
917 lock_sock(sk);
918 udp_v6_push_pending_frames(sk, up);
919 release_sock(sk);
920 }
921 break;
922
923 case UDP_ENCAP:
924 switch (val) {
925 case 0:
926 up->encap_type = val;
927 break;
928 default:
929 err = -ENOPROTOOPT;
930 break;
931 }
932 break;
933
934 default:
935 err = -ENOPROTOOPT;
936 break;
937 };
938
939 return err;
940}
941
942static int udpv6_getsockopt(struct sock *sk, int level, int optname,
943 char __user *optval, int __user *optlen)
944{
945 struct udp_sock *up = udp_sk(sk);
946 int val, len;
947
948 if (level != SOL_UDP)
949 return ipv6_getsockopt(sk, level, optname, optval, optlen);
950
951 if(get_user(len,optlen))
952 return -EFAULT;
953
954 len = min_t(unsigned int, len, sizeof(int));
955
956 if(len < 0)
957 return -EINVAL;
958
959 switch(optname) {
960 case UDP_CORK:
961 val = up->corkflag;
962 break;
963
964 case UDP_ENCAP:
965 val = up->encap_type;
966 break;
967
968 default:
969 return -ENOPROTOOPT;
970 };
971
972 if(put_user(len, optlen))
973 return -EFAULT;
974 if(copy_to_user(optval, &val,len))
975 return -EFAULT;
976 return 0;
977}
978
979static struct inet6_protocol udpv6_protocol = {
980 .handler = udpv6_rcv,
981 .err_handler = udpv6_err,
982 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
983};
984
985/* ------------------------------------------------------------------------ */
986#ifdef CONFIG_PROC_FS
987
988static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
989{
990 struct inet_sock *inet = inet_sk(sp);
991 struct ipv6_pinfo *np = inet6_sk(sp);
992 struct in6_addr *dest, *src;
993 __u16 destp, srcp;
994
995 dest = &np->daddr;
996 src = &np->rcv_saddr;
997 destp = ntohs(inet->dport);
998 srcp = ntohs(inet->sport);
999 seq_printf(seq,
1000 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1001 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1002 bucket,
1003 src->s6_addr32[0], src->s6_addr32[1],
1004 src->s6_addr32[2], src->s6_addr32[3], srcp,
1005 dest->s6_addr32[0], dest->s6_addr32[1],
1006 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1007 sp->sk_state,
1008 atomic_read(&sp->sk_wmem_alloc),
1009 atomic_read(&sp->sk_rmem_alloc),
1010 0, 0L, 0,
1011 sock_i_uid(sp), 0,
1012 sock_i_ino(sp),
1013 atomic_read(&sp->sk_refcnt), sp);
1014}
1015
1016static int udp6_seq_show(struct seq_file *seq, void *v)
1017{
1018 if (v == SEQ_START_TOKEN)
1019 seq_printf(seq,
1020 " sl "
1021 "local_address "
1022 "remote_address "
1023 "st tx_queue rx_queue tr tm->when retrnsmt"
1024 " uid timeout inode\n");
1025 else
1026 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1027 return 0;
1028}
1029
1030static struct file_operations udp6_seq_fops;
1031static struct udp_seq_afinfo udp6_seq_afinfo = {
1032 .owner = THIS_MODULE,
1033 .name = "udp6",
1034 .family = AF_INET6,
1035 .seq_show = udp6_seq_show,
1036 .seq_fops = &udp6_seq_fops,
1037};
1038
1039int __init udp6_proc_init(void)
1040{
1041 return udp_proc_register(&udp6_seq_afinfo);
1042}
1043
1044void udp6_proc_exit(void) {
1045 udp_proc_unregister(&udp6_seq_afinfo);
1046}
1047#endif /* CONFIG_PROC_FS */
1048
1049/* ------------------------------------------------------------------------ */
1050
1051struct proto udpv6_prot = {
1052 .name = "UDPv6",
1053 .owner = THIS_MODULE,
1054 .close = udpv6_close,
1055 .connect = ip6_datagram_connect,
1056 .disconnect = udp_disconnect,
1057 .ioctl = udp_ioctl,
1058 .destroy = udpv6_destroy_sock,
1059 .setsockopt = udpv6_setsockopt,
1060 .getsockopt = udpv6_getsockopt,
1061 .sendmsg = udpv6_sendmsg,
1062 .recvmsg = udpv6_recvmsg,
1063 .backlog_rcv = udpv6_queue_rcv_skb,
1064 .hash = udp_v6_hash,
1065 .unhash = udp_v6_unhash,
1066 .get_port = udp_v6_get_port,
1067 .obj_size = sizeof(struct udp6_sock),
1068};
1069
1da177e4
LT		 1070static struct inet_protosw udpv6_protosw = {
1071 .type = SOCK_DGRAM,
1072 .protocol = IPPROTO_UDP,
1073 .prot = &udpv6_prot,
1074 .ops = &inet6_dgram_ops,
1075 .capability =-1,
1076 .no_check = UDP_CSUM_DEFAULT,
1077 .flags = INET_PROTOSW_PERMANENT,
1078};
1079
1080
1081void __init udpv6_init(void)
1082{
1083 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1084 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1085 inet6_register_protosw(&udpv6_protosw);
1086}
Clone of davem's net-next-2.6 tree