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[PATCH] v850: call init_page_count() instead of set_page_count()
[linux-2.6/verdex.git] / net / ipv6 / udp.c
blobccc57f434cd3cde752edbf840eb624d8b6edfe7a
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/sched.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/netdevice.h>
34 #include <linux/if_arp.h>
35 #include <linux/ipv6.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/skbuff.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 #include <net/tcp_states.h>
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
62 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
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 */
67 static 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;
102 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
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 }
110 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
111 goto fail;
112 gotit:
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
136 fail:
137 write_unlock_bh(&udp_hash_lock);
138 return 1;
139 }
140
141 static void udp_v6_hash(struct sock *sk)
142 {
143 BUG();
144 }
145
146 static 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
156 static 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
210 static 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
220 static 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
236 try_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) {
251 if (__skb_checksum_complete(skb))
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
297 out_free:
298 skb_free_datagram(sk, skb);
299 out:
300 return err;
301
302 csum_copy_err:
303 skb_kill_datagram(sk, skb, flags);
304
305 if (flags & MSG_DONTWAIT) {
306 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
307 return -EAGAIN;
308 }
309 goto try_again;
310 }
311
312 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
313 int type, int code, int offset, __u32 info)
314 {
315 struct ipv6_pinfo *np;
316 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
317 struct net_device *dev = skb->dev;
318 struct in6_addr *saddr = &hdr->saddr;
319 struct in6_addr *daddr = &hdr->daddr;
320 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
321 struct sock *sk;
322 int err;
323
324 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
325
326 if (sk == NULL)
327 return;
328
329 np = inet6_sk(sk);
330
331 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
332 goto out;
333
334 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
335 goto out;
336
337 if (np->recverr)
338 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
339
340 sk->sk_err = err;
341 sk->sk_error_report(sk);
342 out:
343 sock_put(sk);
344 }
345
346 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
347 {
348 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
349 kfree_skb(skb);
350 return -1;
351 }
352
353 if (skb_checksum_complete(skb)) {
354 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
355 kfree_skb(skb);
356 return 0;
357 }
358
359 if (sock_queue_rcv_skb(sk,skb)<0) {
360 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
361 kfree_skb(skb);
362 return 0;
363 }
364 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
365 return 0;
366 }
367
368 static struct sock *udp_v6_mcast_next(struct sock *sk,
369 u16 loc_port, struct in6_addr *loc_addr,
370 u16 rmt_port, struct in6_addr *rmt_addr,
371 int dif)
372 {
373 struct hlist_node *node;
374 struct sock *s = sk;
375 unsigned short num = ntohs(loc_port);
376
377 sk_for_each_from(s, node) {
378 struct inet_sock *inet = inet_sk(s);
379
380 if (inet->num == num && s->sk_family == PF_INET6) {
381 struct ipv6_pinfo *np = inet6_sk(s);
382 if (inet->dport) {
383 if (inet->dport != rmt_port)
384 continue;
385 }
386 if (!ipv6_addr_any(&np->daddr) &&
387 !ipv6_addr_equal(&np->daddr, rmt_addr))
388 continue;
389
390 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
391 continue;
392
393 if (!ipv6_addr_any(&np->rcv_saddr)) {
394 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
395 continue;
396 }
397 if(!inet6_mc_check(s, loc_addr, rmt_addr))
398 continue;
399 return s;
400 }
401 }
402 return NULL;
403 }
404
405 /*
406 * Note: called only from the BH handler context,
407 * so we don't need to lock the hashes.
408 */
409 static void udpv6_mcast_deliver(struct udphdr *uh,
410 struct in6_addr *saddr, struct in6_addr *daddr,
411 struct sk_buff *skb)
412 {
413 struct sock *sk, *sk2;
414 int dif;
415
416 read_lock(&udp_hash_lock);
417 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
418 dif = skb->dev->ifindex;
419 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
420 if (!sk) {
421 kfree_skb(skb);
422 goto out;
423 }
424
425 sk2 = sk;
426 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
427 uh->source, saddr, dif))) {
428 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
429 if (buff)
430 udpv6_queue_rcv_skb(sk2, buff);
431 }
432 udpv6_queue_rcv_skb(sk, skb);
433 out:
434 read_unlock(&udp_hash_lock);
435 }
436
437 static int udpv6_rcv(struct sk_buff **pskb)
438 {
439 struct sk_buff *skb = *pskb;
440 struct sock *sk;
441 struct udphdr *uh;
442 struct net_device *dev = skb->dev;
443 struct in6_addr *saddr, *daddr;
444 u32 ulen = 0;
445
446 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
447 goto short_packet;
448
449 saddr = &skb->nh.ipv6h->saddr;
450 daddr = &skb->nh.ipv6h->daddr;
451 uh = skb->h.uh;
452
453 ulen = ntohs(uh->len);
454
455 /* Check for jumbo payload */
456 if (ulen == 0)
457 ulen = skb->len;
458
459 if (ulen > skb->len || ulen < sizeof(*uh))
460 goto short_packet;
461
462 if (uh->check == 0) {
463 /* RFC 2460 section 8.1 says that we SHOULD log
464 this error. Well, it is reasonable.
465 */
466 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
467 goto discard;
468 }
469
470 if (ulen < skb->len) {
471 if (pskb_trim_rcsum(skb, ulen))
472 goto discard;
473 saddr = &skb->nh.ipv6h->saddr;
474 daddr = &skb->nh.ipv6h->daddr;
475 uh = skb->h.uh;
476 }
477
478 if (skb->ip_summed == CHECKSUM_HW &&
479 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
480 skb->ip_summed = CHECKSUM_UNNECESSARY;
481
482 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
483 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
484
485 /*
486 * Multicast receive code
487 */
488 if (ipv6_addr_is_multicast(daddr)) {
489 udpv6_mcast_deliver(uh, saddr, daddr, skb);
490 return 0;
491 }
492
493 /* Unicast */
494
495 /*
496 * check socket cache ... must talk to Alan about his plans
497 * for sock caches... i'll skip this for now.
498 */
499 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
500
501 if (sk == NULL) {
502 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
503 goto discard;
504
505 if (skb_checksum_complete(skb))
506 goto discard;
507 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
508
509 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
510
511 kfree_skb(skb);
512 return(0);
513 }
514
515 /* deliver */
516
517 udpv6_queue_rcv_skb(sk, skb);
518 sock_put(sk);
519 return(0);
520
521 short_packet:
522 if (net_ratelimit())
523 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
524
525 discard:
526 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
527 kfree_skb(skb);
528 return(0);
529 }
530 /*
531 * Throw away all pending data and cancel the corking. Socket is locked.
532 */
533 static void udp_v6_flush_pending_frames(struct sock *sk)
534 {
535 struct udp_sock *up = udp_sk(sk);
536
537 if (up->pending) {
538 up->len = 0;
539 up->pending = 0;
540 ip6_flush_pending_frames(sk);
541 }
542 }
543
544 /*
545 * Sending
546 */
547
548 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
549 {
550 struct sk_buff *skb;
551 struct udphdr *uh;
552 struct inet_sock *inet = inet_sk(sk);
553 struct flowi *fl = &inet->cork.fl;
554 int err = 0;
555
556 /* Grab the skbuff where UDP header space exists. */
557 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
558 goto out;
559
560 /*
561 * Create a UDP header
562 */
563 uh = skb->h.uh;
564 uh->source = fl->fl_ip_sport;
565 uh->dest = fl->fl_ip_dport;
566 uh->len = htons(up->len);
567 uh->check = 0;
568
569 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
570 skb->ip_summed = CHECKSUM_NONE;
571 goto send;
572 }
573
574 if (skb_queue_len(&sk->sk_write_queue) == 1) {
575 skb->csum = csum_partial((char *)uh,
576 sizeof(struct udphdr), skb->csum);
577 uh->check = csum_ipv6_magic(&fl->fl6_src,
578 &fl->fl6_dst,
579 up->len, fl->proto, skb->csum);
580 } else {
581 u32 tmp_csum = 0;
582
583 skb_queue_walk(&sk->sk_write_queue, skb) {
584 tmp_csum = csum_add(tmp_csum, skb->csum);
585 }
586 tmp_csum = csum_partial((char *)uh,
587 sizeof(struct udphdr), tmp_csum);
588 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
589 &fl->fl6_dst,
590 up->len, fl->proto, tmp_csum);
591 uh->check = tmp_csum;
592
593 }
594 if (uh->check == 0)
595 uh->check = -1;
596
597 send:
598 err = ip6_push_pending_frames(sk);
599 out:
600 up->len = 0;
601 up->pending = 0;
602 return err;
603 }
604
605 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
606 struct msghdr *msg, size_t len)
607 {
608 struct ipv6_txoptions opt_space;
609 struct udp_sock *up = udp_sk(sk);
610 struct inet_sock *inet = inet_sk(sk);
611 struct ipv6_pinfo *np = inet6_sk(sk);
612 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
613 struct in6_addr *daddr, *final_p = NULL, final;
614 struct ipv6_txoptions *opt = NULL;
615 struct ip6_flowlabel *flowlabel = NULL;
616 struct flowi *fl = &inet->cork.fl;
617 struct dst_entry *dst;
618 int addr_len = msg->msg_namelen;
619 int ulen = len;
620 int hlimit = -1;
621 int tclass = -1;
622 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
623 int err;
624 int connected = 0;
625
626 /* destination address check */
627 if (sin6) {
628 if (addr_len < offsetof(struct sockaddr, sa_data))
629 return -EINVAL;
630
631 switch (sin6->sin6_family) {
632 case AF_INET6:
633 if (addr_len < SIN6_LEN_RFC2133)
634 return -EINVAL;
635 daddr = &sin6->sin6_addr;
636 break;
637 case AF_INET:
638 goto do_udp_sendmsg;
639 case AF_UNSPEC:
640 msg->msg_name = sin6 = NULL;
641 msg->msg_namelen = addr_len = 0;
642 daddr = NULL;
643 break;
644 default:
645 return -EINVAL;
646 }
647 } else if (!up->pending) {
648 if (sk->sk_state != TCP_ESTABLISHED)
649 return -EDESTADDRREQ;
650 daddr = &np->daddr;
651 } else
652 daddr = NULL;
653
654 if (daddr) {
655 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
656 struct sockaddr_in sin;
657 sin.sin_family = AF_INET;
658 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
659 sin.sin_addr.s_addr = daddr->s6_addr32[3];
660 msg->msg_name = &sin;
661 msg->msg_namelen = sizeof(sin);
662 do_udp_sendmsg:
663 if (__ipv6_only_sock(sk))
664 return -ENETUNREACH;
665 return udp_sendmsg(iocb, sk, msg, len);
666 }
667 }
668
669 if (up->pending == AF_INET)
670 return udp_sendmsg(iocb, sk, msg, len);
671
672 /* Rough check on arithmetic overflow,
673 better check is made in ip6_build_xmit
674 */
675 if (len > INT_MAX - sizeof(struct udphdr))
676 return -EMSGSIZE;
677
678 if (up->pending) {
679 /*
680 * There are pending frames.
681 * The socket lock must be held while it's corked.
682 */
683 lock_sock(sk);
684 if (likely(up->pending)) {
685 if (unlikely(up->pending != AF_INET6)) {
686 release_sock(sk);
687 return -EAFNOSUPPORT;
688 }
689 dst = NULL;
690 goto do_append_data;
691 }
692 release_sock(sk);
693 }
694 ulen += sizeof(struct udphdr);
695
696 memset(fl, 0, sizeof(*fl));
697
698 if (sin6) {
699 if (sin6->sin6_port == 0)
700 return -EINVAL;
701
702 fl->fl_ip_dport = sin6->sin6_port;
703 daddr = &sin6->sin6_addr;
704
705 if (np->sndflow) {
706 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
707 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
708 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
709 if (flowlabel == NULL)
710 return -EINVAL;
711 daddr = &flowlabel->dst;
712 }
713 }
714
715 /*
716 * Otherwise it will be difficult to maintain
717 * sk->sk_dst_cache.
718 */
719 if (sk->sk_state == TCP_ESTABLISHED &&
720 ipv6_addr_equal(daddr, &np->daddr))
721 daddr = &np->daddr;
722
723 if (addr_len >= sizeof(struct sockaddr_in6) &&
724 sin6->sin6_scope_id &&
725 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
726 fl->oif = sin6->sin6_scope_id;
727 } else {
728 if (sk->sk_state != TCP_ESTABLISHED)
729 return -EDESTADDRREQ;
730
731 fl->fl_ip_dport = inet->dport;
732 daddr = &np->daddr;
733 fl->fl6_flowlabel = np->flow_label;
734 connected = 1;
735 }
736
737 if (!fl->oif)
738 fl->oif = sk->sk_bound_dev_if;
739
740 if (msg->msg_controllen) {
741 opt = &opt_space;
742 memset(opt, 0, sizeof(struct ipv6_txoptions));
743 opt->tot_len = sizeof(*opt);
744
745 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
746 if (err < 0) {
747 fl6_sock_release(flowlabel);
748 return err;
749 }
750 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
751 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
752 if (flowlabel == NULL)
753 return -EINVAL;
754 }
755 if (!(opt->opt_nflen|opt->opt_flen))
756 opt = NULL;
757 connected = 0;
758 }
759 if (opt == NULL)
760 opt = np->opt;
761 if (flowlabel)
762 opt = fl6_merge_options(&opt_space, flowlabel, opt);
763 opt = ipv6_fixup_options(&opt_space, opt);
764
765 fl->proto = IPPROTO_UDP;
766 ipv6_addr_copy(&fl->fl6_dst, daddr);
767 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
768 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
769 fl->fl_ip_sport = inet->sport;
770
771 /* merge ip6_build_xmit from ip6_output */
772 if (opt && opt->srcrt) {
773 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
774 ipv6_addr_copy(&final, &fl->fl6_dst);
775 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
776 final_p = &final;
777 connected = 0;
778 }
779
780 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
781 fl->oif = np->mcast_oif;
782 connected = 0;
783 }
784
785 err = ip6_dst_lookup(sk, &dst, fl);
786 if (err)
787 goto out;
788 if (final_p)
789 ipv6_addr_copy(&fl->fl6_dst, final_p);
790
791 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
792 goto out;
793
794 if (hlimit < 0) {
795 if (ipv6_addr_is_multicast(&fl->fl6_dst))
796 hlimit = np->mcast_hops;
797 else
798 hlimit = np->hop_limit;
799 if (hlimit < 0)
800 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
801 if (hlimit < 0)
802 hlimit = ipv6_get_hoplimit(dst->dev);
803 }
804
805 if (tclass < 0) {
806 tclass = np->tclass;
807 if (tclass < 0)
808 tclass = 0;
809 }
810
811 if (msg->msg_flags&MSG_CONFIRM)
812 goto do_confirm;
813 back_from_confirm:
814
815 lock_sock(sk);
816 if (unlikely(up->pending)) {
817 /* The socket is already corked while preparing it. */
818 /* ... which is an evident application bug. --ANK */
819 release_sock(sk);
820
821 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
822 err = -EINVAL;
823 goto out;
824 }
825
826 up->pending = AF_INET6;
827
828 do_append_data:
829 up->len += ulen;
830 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
831 sizeof(struct udphdr), hlimit, tclass, opt, fl,
832 (struct rt6_info*)dst,
833 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
834 if (err)
835 udp_v6_flush_pending_frames(sk);
836 else if (!corkreq)
837 err = udp_v6_push_pending_frames(sk, up);
838
839 if (dst) {
840 if (connected) {
841 ip6_dst_store(sk, dst,
842 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
843 &np->daddr : NULL);
844 } else {
845 dst_release(dst);
846 }
847 }
848
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 do_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(optlen<sizeof(int))
890 return -EINVAL;
891
892 if (get_user(val, (int __user *)optval))
893 return -EFAULT;
894
895 switch(optname) {
896 case UDP_CORK:
897 if (val != 0) {
898 up->corkflag = 1;
899 } else {
900 up->corkflag = 0;
901 lock_sock(sk);
902 udp_v6_push_pending_frames(sk, up);
903 release_sock(sk);
904 }
905 break;
906
907 case UDP_ENCAP:
908 switch (val) {
909 case 0:
910 up->encap_type = val;
911 break;
912 default:
913 err = -ENOPROTOOPT;
914 break;
915 }
916 break;
917
918 default:
919 err = -ENOPROTOOPT;
920 break;
921 };
922
923 return err;
924 }
925
926 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
927 char __user *optval, int optlen)
928 {
929 if (level != SOL_UDP)
930 return ipv6_setsockopt(sk, level, optname, optval, optlen);
931 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
932 }
933
934 #ifdef CONFIG_COMPAT
935 static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
936 char __user *optval, int optlen)
937 {
938 if (level != SOL_UDP)
939 return compat_ipv6_setsockopt(sk, level, optname,
940 optval, optlen);
941 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
942 }
943 #endif
944
945 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
946 char __user *optval, int __user *optlen)
947 {
948 struct udp_sock *up = udp_sk(sk);
949 int val, len;
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
979 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
980 char __user *optval, int __user *optlen)
981 {
982 if (level != SOL_UDP)
983 return ipv6_getsockopt(sk, level, optname, optval, optlen);
984 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
985 }
986
987 #ifdef CONFIG_COMPAT
988 static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
989 char __user *optval, int __user *optlen)
990 {
991 if (level != SOL_UDP)
992 return compat_ipv6_getsockopt(sk, level, optname,
993 optval, optlen);
994 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
995 }
996 #endif
997
998 static struct inet6_protocol udpv6_protocol = {
999 .handler = udpv6_rcv,
1000 .err_handler = udpv6_err,
1001 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1002 };
1003
1004 /* ------------------------------------------------------------------------ */
1005 #ifdef CONFIG_PROC_FS
1006
1007 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1008 {
1009 struct inet_sock *inet = inet_sk(sp);
1010 struct ipv6_pinfo *np = inet6_sk(sp);
1011 struct in6_addr *dest, *src;
1012 __u16 destp, srcp;
1013
1014 dest = &np->daddr;
1015 src = &np->rcv_saddr;
1016 destp = ntohs(inet->dport);
1017 srcp = ntohs(inet->sport);
1018 seq_printf(seq,
1019 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1020 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1021 bucket,
1022 src->s6_addr32[0], src->s6_addr32[1],
1023 src->s6_addr32[2], src->s6_addr32[3], srcp,
1024 dest->s6_addr32[0], dest->s6_addr32[1],
1025 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1026 sp->sk_state,
1027 atomic_read(&sp->sk_wmem_alloc),
1028 atomic_read(&sp->sk_rmem_alloc),
1029 0, 0L, 0,
1030 sock_i_uid(sp), 0,
1031 sock_i_ino(sp),
1032 atomic_read(&sp->sk_refcnt), sp);
1033 }
1034
1035 static int udp6_seq_show(struct seq_file *seq, void *v)
1036 {
1037 if (v == SEQ_START_TOKEN)
1038 seq_printf(seq,
1039 " sl "
1040 "local_address "
1041 "remote_address "
1042 "st tx_queue rx_queue tr tm->when retrnsmt"
1043 " uid timeout inode\n");
1044 else
1045 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1046 return 0;
1047 }
1048
1049 static struct file_operations udp6_seq_fops;
1050 static struct udp_seq_afinfo udp6_seq_afinfo = {
1051 .owner = THIS_MODULE,
1052 .name = "udp6",
1053 .family = AF_INET6,
1054 .seq_show = udp6_seq_show,
1055 .seq_fops = &udp6_seq_fops,
1056 };
1057
1058 int __init udp6_proc_init(void)
1059 {
1060 return udp_proc_register(&udp6_seq_afinfo);
1061 }
1062
1063 void udp6_proc_exit(void) {
1064 udp_proc_unregister(&udp6_seq_afinfo);
1065 }
1066 #endif /* CONFIG_PROC_FS */
1067
1068 /* ------------------------------------------------------------------------ */
1069
1070 struct proto udpv6_prot = {
1071 .name = "UDPv6",
1072 .owner = THIS_MODULE,
1073 .close = udpv6_close,
1074 .connect = ip6_datagram_connect,
1075 .disconnect = udp_disconnect,
1076 .ioctl = udp_ioctl,
1077 .destroy = udpv6_destroy_sock,
1078 .setsockopt = udpv6_setsockopt,
1079 .getsockopt = udpv6_getsockopt,
1080 .sendmsg = udpv6_sendmsg,
1081 .recvmsg = udpv6_recvmsg,
1082 .backlog_rcv = udpv6_queue_rcv_skb,
1083 .hash = udp_v6_hash,
1084 .unhash = udp_v6_unhash,
1085 .get_port = udp_v6_get_port,
1086 .obj_size = sizeof(struct udp6_sock),
1087 #ifdef CONFIG_COMPAT
1088 .compat_setsockopt = compat_udpv6_setsockopt,
1089 .compat_getsockopt = compat_udpv6_getsockopt,
1090 #endif
1091 };
1092
1093 static struct inet_protosw udpv6_protosw = {
1094 .type = SOCK_DGRAM,
1095 .protocol = IPPROTO_UDP,
1096 .prot = &udpv6_prot,
1097 .ops = &inet6_dgram_ops,
1098 .capability =-1,
1099 .no_check = UDP_CSUM_DEFAULT,
1100 .flags = INET_PROTOSW_PERMANENT,
1101 };
1102
1103
1104 void __init udpv6_init(void)
1105 {
1106 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1107 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1108 inet6_register_protosw(&udpv6_protosw);
1109 }
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