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[IPV6]: Limit network triggerable printks.
[linux-2.6/history.git] / net / ipv6 / udp.c
blob35940f20995559db971656cfe83c240637ce11e1
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/inet_common.h>
53
54 #include <net/checksum.h>
55 #include <net/xfrm.h>
56
57 #include <linux/proc_fs.h>
58 #include <linux/seq_file.h>
59
60 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
61
62 /* Grrr, addr_type already calculated by caller, but I don't want
63 * to add some silly "cookie" argument to this method just for that.
64 */
65 static int udp_v6_get_port(struct sock *sk, unsigned short snum)
66 {
67 struct sock *sk2;
68 struct hlist_node *node;
69
70 write_lock_bh(&udp_hash_lock);
71 if (snum == 0) {
72 int best_size_so_far, best, result, i;
73
74 if (udp_port_rover > sysctl_local_port_range[1] ||
75 udp_port_rover < sysctl_local_port_range[0])
76 udp_port_rover = sysctl_local_port_range[0];
77 best_size_so_far = 32767;
78 best = result = udp_port_rover;
79 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
80 int size;
81 struct hlist_head *list;
82
83 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
84 if (hlist_empty(list)) {
85 if (result > sysctl_local_port_range[1])
86 result = sysctl_local_port_range[0] +
87 ((result - sysctl_local_port_range[0]) &
88 (UDP_HTABLE_SIZE - 1));
89 goto gotit;
90 }
91 size = 0;
92 sk_for_each(sk2, node, list)
93 if (++size >= best_size_so_far)
94 goto next;
95 best_size_so_far = size;
96 best = result;
97 next:;
98 }
99 result = best;
100 for(;; result += UDP_HTABLE_SIZE) {
101 if (result > sysctl_local_port_range[1])
102 result = sysctl_local_port_range[0]
103 + ((result - sysctl_local_port_range[0]) &
104 (UDP_HTABLE_SIZE - 1));
105 if (!udp_lport_inuse(result))
106 break;
107 }
108 gotit:
109 udp_port_rover = snum = result;
110 } else {
111 sk_for_each(sk2, node,
112 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
113 if (inet_sk(sk2)->num == snum &&
114 sk2 != sk &&
115 (!sk2->sk_bound_dev_if ||
116 !sk->sk_bound_dev_if ||
117 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
118 (!sk2->sk_reuse || !sk->sk_reuse) &&
119 ipv6_rcv_saddr_equal(sk, sk2))
120 goto fail;
121 }
122 }
123
124 inet_sk(sk)->num = snum;
125 if (sk_unhashed(sk)) {
126 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
127 sock_prot_inc_use(sk->sk_prot);
128 }
129 write_unlock_bh(&udp_hash_lock);
130 return 0;
131
132 fail:
133 write_unlock_bh(&udp_hash_lock);
134 return 1;
135 }
136
137 static void udp_v6_hash(struct sock *sk)
138 {
139 BUG();
140 }
141
142 static void udp_v6_unhash(struct sock *sk)
143 {
144 write_lock_bh(&udp_hash_lock);
145 if (sk_del_node_init(sk)) {
146 inet_sk(sk)->num = 0;
147 sock_prot_dec_use(sk->sk_prot);
148 }
149 write_unlock_bh(&udp_hash_lock);
150 }
151
152 static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
153 struct in6_addr *daddr, u16 dport, int dif)
154 {
155 struct sock *sk, *result = NULL;
156 struct hlist_node *node;
157 unsigned short hnum = ntohs(dport);
158 int badness = -1;
159
160 read_lock(&udp_hash_lock);
161 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
162 struct inet_opt *inet = inet_sk(sk);
163
164 if (inet->num == hnum && sk->sk_family == PF_INET6) {
165 struct ipv6_pinfo *np = inet6_sk(sk);
166 int score = 0;
167 if (inet->dport) {
168 if (inet->dport != sport)
169 continue;
170 score++;
171 }
172 if (!ipv6_addr_any(&np->rcv_saddr)) {
173 if (ipv6_addr_cmp(&np->rcv_saddr, daddr))
174 continue;
175 score++;
176 }
177 if (!ipv6_addr_any(&np->daddr)) {
178 if (ipv6_addr_cmp(&np->daddr, saddr))
179 continue;
180 score++;
181 }
182 if (sk->sk_bound_dev_if) {
183 if (sk->sk_bound_dev_if != dif)
184 continue;
185 score++;
186 }
187 if(score == 4) {
188 result = sk;
189 break;
190 } else if(score > badness) {
191 result = sk;
192 badness = score;
193 }
194 }
195 }
196 if (result)
197 sock_hold(result);
198 read_unlock(&udp_hash_lock);
199 return result;
200 }
201
202 /*
203 *
204 */
205
206 int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
207 {
208 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
209 struct inet_opt *inet = inet_sk(sk);
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct in6_addr *daddr;
212 struct dst_entry *dst;
213 struct flowi fl;
214 struct ip6_flowlabel *flowlabel = NULL;
215 int addr_type;
216 int err;
217
218 if (usin->sin6_family == AF_INET) {
219 if (__ipv6_only_sock(sk))
220 return -EAFNOSUPPORT;
221 err = udp_connect(sk, uaddr, addr_len);
222 goto ipv4_connected;
223 }
224
225 if (addr_len < SIN6_LEN_RFC2133)
226 return -EINVAL;
227
228 if (usin->sin6_family != AF_INET6)
229 return -EAFNOSUPPORT;
230
231 memset(&fl, 0, sizeof(fl));
232 if (np->sndflow) {
233 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
234 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
235 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
236 if (flowlabel == NULL)
237 return -EINVAL;
238 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
239 }
240 }
241
242 addr_type = ipv6_addr_type(&usin->sin6_addr);
243
244 if (addr_type == IPV6_ADDR_ANY) {
245 /*
246 * connect to self
247 */
248 usin->sin6_addr.s6_addr[15] = 0x01;
249 }
250
251 daddr = &usin->sin6_addr;
252
253 if (addr_type == IPV6_ADDR_MAPPED) {
254 struct sockaddr_in sin;
255
256 if (__ipv6_only_sock(sk)) {
257 err = -ENETUNREACH;
258 goto out;
259 }
260 sin.sin_family = AF_INET;
261 sin.sin_addr.s_addr = daddr->s6_addr32[3];
262 sin.sin_port = usin->sin6_port;
263
264 err = udp_connect(sk, (struct sockaddr*) &sin, sizeof(sin));
265
266 ipv4_connected:
267 if (err)
268 goto out;
269
270 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
271
272 if (ipv6_addr_any(&np->saddr)) {
273 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
274 inet->saddr);
275 }
276
277 if (ipv6_addr_any(&np->rcv_saddr)) {
278 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
279 inet->rcv_saddr);
280 }
281 goto out;
282 }
283
284 if (addr_type&IPV6_ADDR_LINKLOCAL) {
285 if (addr_len >= sizeof(struct sockaddr_in6) &&
286 usin->sin6_scope_id) {
287 if (sk->sk_bound_dev_if &&
288 sk->sk_bound_dev_if != usin->sin6_scope_id) {
289 err = -EINVAL;
290 goto out;
291 }
292 sk->sk_bound_dev_if = usin->sin6_scope_id;
293 if (!sk->sk_bound_dev_if &&
294 (addr_type & IPV6_ADDR_MULTICAST))
295 fl.oif = np->mcast_oif;
296 }
297
298 /* Connect to link-local address requires an interface */
299 if (!sk->sk_bound_dev_if) {
300 err = -EINVAL;
301 goto out;
302 }
303 }
304
305 ipv6_addr_copy(&np->daddr, daddr);
306 np->flow_label = fl.fl6_flowlabel;
307
308 inet->dport = usin->sin6_port;
309
310 /*
311 * Check for a route to destination an obtain the
312 * destination cache for it.
313 */
314
315 fl.proto = IPPROTO_UDP;
316 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
317 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
318 fl.oif = sk->sk_bound_dev_if;
319 fl.fl_ip_dport = inet->dport;
320 fl.fl_ip_sport = inet->sport;
321
322 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
323 fl.oif = np->mcast_oif;
324
325 if (flowlabel) {
326 if (flowlabel->opt && flowlabel->opt->srcrt) {
327 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
328 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
329 }
330 } else if (np->opt && np->opt->srcrt) {
331 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
332 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
333 }
334
335 err = ip6_dst_lookup(sk, &dst, &fl);
336 if (err)
337 goto out;
338
339 /* source address lookup done in ip6_dst_lookup */
340
341 if (ipv6_addr_any(&np->saddr))
342 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
343
344 if (ipv6_addr_any(&np->rcv_saddr)) {
345 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
346 inet->rcv_saddr = LOOPBACK4_IPV6;
347 }
348
349 ip6_dst_store(sk, dst,
350 !ipv6_addr_cmp(&fl.fl6_dst, &np->daddr) ?
351 &np->daddr : NULL);
352
353 sk->sk_state = TCP_ESTABLISHED;
354 out:
355 fl6_sock_release(flowlabel);
356 return err;
357 }
358
359 static void udpv6_close(struct sock *sk, long timeout)
360 {
361 inet_sock_release(sk);
362 }
363
364 /*
365 * This should be easy, if there is something there we
366 * return it, otherwise we block.
367 */
368
369 static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
370 struct msghdr *msg, size_t len,
371 int noblock, int flags, int *addr_len)
372 {
373 struct ipv6_pinfo *np = inet6_sk(sk);
374 struct sk_buff *skb;
375 size_t copied;
376 int err;
377
378 if (addr_len)
379 *addr_len=sizeof(struct sockaddr_in6);
380
381 if (flags & MSG_ERRQUEUE)
382 return ipv6_recv_error(sk, msg, len);
383
384 try_again:
385 skb = skb_recv_datagram(sk, flags, noblock, &err);
386 if (!skb)
387 goto out;
388
389 copied = skb->len - sizeof(struct udphdr);
390 if (copied > len) {
391 copied = len;
392 msg->msg_flags |= MSG_TRUNC;
393 }
394
395 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
396 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
397 copied);
398 } else if (msg->msg_flags&MSG_TRUNC) {
399 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
400 goto csum_copy_err;
401 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
402 copied);
403 } else {
404 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
405 if (err == -EINVAL)
406 goto csum_copy_err;
407 }
408 if (err)
409 goto out_free;
410
411 sock_recv_timestamp(msg, sk, skb);
412
413 /* Copy the address. */
414 if (msg->msg_name) {
415 struct sockaddr_in6 *sin6;
416
417 sin6 = (struct sockaddr_in6 *) msg->msg_name;
418 sin6->sin6_family = AF_INET6;
419 sin6->sin6_port = skb->h.uh->source;
420 sin6->sin6_flowinfo = 0;
421 sin6->sin6_scope_id = 0;
422
423 if (skb->protocol == htons(ETH_P_IP)) {
424 struct inet_opt *inet = inet_sk(sk);
425
426 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
427 htonl(0xffff), skb->nh.iph->saddr);
428 if (inet->cmsg_flags)
429 ip_cmsg_recv(msg, skb);
430 } else {
431 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
432
433 if (np->rxopt.all)
434 datagram_recv_ctl(sk, msg, skb);
435 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
436 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
437 sin6->sin6_scope_id = opt->iif;
438 }
439 }
440 }
441 err = copied;
442
443 out_free:
444 skb_free_datagram(sk, skb);
445 out:
446 return err;
447
448 csum_copy_err:
449 /* Clear queue. */
450 if (flags&MSG_PEEK) {
451 int clear = 0;
452 spin_lock_irq(&sk->sk_receive_queue.lock);
453 if (skb == skb_peek(&sk->sk_receive_queue)) {
454 __skb_unlink(skb, &sk->sk_receive_queue);
455 clear = 1;
456 }
457 spin_unlock_irq(&sk->sk_receive_queue.lock);
458 if (clear)
459 kfree_skb(skb);
460 }
461
462 skb_free_datagram(sk, skb);
463
464 if (flags & MSG_DONTWAIT) {
465 UDP6_INC_STATS_USER(UdpInErrors);
466 return -EAGAIN;
467 }
468 goto try_again;
469 }
470
471 static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
472 int type, int code, int offset, __u32 info)
473 {
474 struct ipv6_pinfo *np;
475 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
476 struct net_device *dev = skb->dev;
477 struct in6_addr *saddr = &hdr->saddr;
478 struct in6_addr *daddr = &hdr->daddr;
479 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
480 struct sock *sk;
481 int err;
482
483 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
484
485 if (sk == NULL)
486 return;
487
488 np = inet6_sk(sk);
489
490 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
491 goto out;
492
493 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
494 goto out;
495
496 if (np->recverr)
497 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
498
499 sk->sk_err = err;
500 sk->sk_error_report(sk);
501 out:
502 sock_put(sk);
503 }
504
505 static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
506 {
507 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
508 kfree_skb(skb);
509 return -1;
510 }
511
512 if (sk->sk_filter && skb->ip_summed != CHECKSUM_UNNECESSARY) {
513 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
514 UDP6_INC_STATS_BH(UdpInErrors);
515 kfree_skb(skb);
516 return 0;
517 }
518 skb->ip_summed = CHECKSUM_UNNECESSARY;
519 }
520
521 if (sock_queue_rcv_skb(sk,skb)<0) {
522 UDP6_INC_STATS_BH(UdpInErrors);
523 kfree_skb(skb);
524 return 0;
525 }
526 UDP6_INC_STATS_BH(UdpInDatagrams);
527 return 0;
528 }
529
530 static struct sock *udp_v6_mcast_next(struct sock *sk,
531 u16 loc_port, struct in6_addr *loc_addr,
532 u16 rmt_port, struct in6_addr *rmt_addr,
533 int dif)
534 {
535 struct hlist_node *node;
536 struct sock *s = sk;
537 unsigned short num = ntohs(loc_port);
538
539 sk_for_each_from(s, node) {
540 struct inet_opt *inet = inet_sk(s);
541
542 if (inet->num == num && s->sk_family == PF_INET6) {
543 struct ipv6_pinfo *np = inet6_sk(s);
544 if (inet->dport) {
545 if (inet->dport != rmt_port)
546 continue;
547 }
548 if (!ipv6_addr_any(&np->daddr) &&
549 ipv6_addr_cmp(&np->daddr, rmt_addr))
550 continue;
551
552 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
553 continue;
554
555 if (!ipv6_addr_any(&np->rcv_saddr)) {
556 if (!ipv6_addr_cmp(&np->rcv_saddr, loc_addr))
557 return s;
558 continue;
559 }
560 if(!inet6_mc_check(s, loc_addr, rmt_addr))
561 continue;
562 return s;
563 }
564 }
565 return NULL;
566 }
567
568 /*
569 * Note: called only from the BH handler context,
570 * so we don't need to lock the hashes.
571 */
572 static void udpv6_mcast_deliver(struct udphdr *uh,
573 struct in6_addr *saddr, struct in6_addr *daddr,
574 struct sk_buff *skb)
575 {
576 struct sock *sk, *sk2;
577 struct sk_buff *buff;
578 int dif;
579
580 read_lock(&udp_hash_lock);
581 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
582 dif = skb->dev->ifindex;
583 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
584 if (!sk)
585 goto free_skb;
586
587 buff = NULL;
588 sk2 = sk;
589 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
590 uh->source, saddr, dif))) {
591 if (!buff) {
592 buff = skb_clone(skb, GFP_ATOMIC);
593 if (!buff)
594 continue;
595 }
596 if (udpv6_queue_rcv_skb(sk2, buff) >= 0)
597 buff = NULL;
598 }
599 if (buff)
600 kfree_skb(buff);
601 if (udpv6_queue_rcv_skb(sk, skb) < 0) {
602 free_skb:
603 kfree_skb(skb);
604 }
605 read_unlock(&udp_hash_lock);
606 }
607
608 static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
609 {
610 struct sk_buff *skb = *pskb;
611 struct sock *sk;
612 struct udphdr *uh;
613 struct net_device *dev = skb->dev;
614 struct in6_addr *saddr, *daddr;
615 u32 ulen = 0;
616
617 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
618 goto short_packet;
619
620 saddr = &skb->nh.ipv6h->saddr;
621 daddr = &skb->nh.ipv6h->daddr;
622 uh = skb->h.uh;
623
624 ulen = ntohs(uh->len);
625
626 /* Check for jumbo payload */
627 if (ulen == 0)
628 ulen = skb->len;
629
630 if (ulen > skb->len || ulen < sizeof(*uh))
631 goto short_packet;
632
633 if (uh->check == 0) {
634 /* RFC 2460 section 8.1 says that we SHOULD log
635 this error. Well, it is reasonable.
636 */
637 LIMIT_NETDEBUG(
638 printk(KERN_INFO "IPv6: udp checksum is 0\n"));
639 goto discard;
640 }
641
642 if (ulen < skb->len) {
643 if (__pskb_trim(skb, ulen))
644 goto discard;
645 saddr = &skb->nh.ipv6h->saddr;
646 daddr = &skb->nh.ipv6h->daddr;
647 uh = skb->h.uh;
648 }
649
650 if (skb->ip_summed==CHECKSUM_HW) {
651 skb->ip_summed = CHECKSUM_UNNECESSARY;
652 if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
653 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
654 skb->ip_summed = CHECKSUM_NONE;
655 }
656 }
657 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
658 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
659
660 /*
661 * Multicast receive code
662 */
663 if (ipv6_addr_is_multicast(daddr)) {
664 udpv6_mcast_deliver(uh, saddr, daddr, skb);
665 return 0;
666 }
667
668 /* Unicast */
669
670 /*
671 * check socket cache ... must talk to Alan about his plans
672 * for sock caches... i'll skip this for now.
673 */
674 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
675
676 if (sk == NULL) {
677 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
678 goto discard;
679
680 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
681 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
682 goto discard;
683 UDP6_INC_STATS_BH(UdpNoPorts);
684
685 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
686
687 kfree_skb(skb);
688 return(0);
689 }
690
691 /* deliver */
692
693 udpv6_queue_rcv_skb(sk, skb);
694 sock_put(sk);
695 return(0);
696
697 short_packet:
698 if (net_ratelimit())
699 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
700
701 discard:
702 UDP6_INC_STATS_BH(UdpInErrors);
703 kfree_skb(skb);
704 return(0);
705 }
706 /*
707 * Throw away all pending data and cancel the corking. Socket is locked.
708 */
709 static void udp_v6_flush_pending_frames(struct sock *sk)
710 {
711 struct udp_opt *up = udp_sk(sk);
712
713 if (up->pending) {
714 up->len = 0;
715 up->pending = 0;
716 ip6_flush_pending_frames(sk);
717 }
718 }
719
720 /*
721 * Sending
722 */
723
724 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_opt *up)
725 {
726 struct sk_buff *skb;
727 struct udphdr *uh;
728 struct inet_opt *inet = inet_sk(sk);
729 struct flowi *fl = &inet->cork.fl;
730 int err = 0;
731
732 /* Grab the skbuff where UDP header space exists. */
733 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
734 goto out;
735
736 /*
737 * Create a UDP header
738 */
739 uh = skb->h.uh;
740 uh->source = fl->fl_ip_sport;
741 uh->dest = fl->fl_ip_dport;
742 uh->len = htons(up->len);
743 uh->check = 0;
744
745 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
746 skb->ip_summed = CHECKSUM_NONE;
747 goto send;
748 }
749
750 if (skb_queue_len(&sk->sk_write_queue) == 1) {
751 skb->csum = csum_partial((char *)uh,
752 sizeof(struct udphdr), skb->csum);
753 uh->check = csum_ipv6_magic(&fl->fl6_src,
754 &fl->fl6_dst,
755 up->len, fl->proto, skb->csum);
756 } else {
757 u32 tmp_csum = 0;
758
759 skb_queue_walk(&sk->sk_write_queue, skb) {
760 tmp_csum = csum_add(tmp_csum, skb->csum);
761 }
762 tmp_csum = csum_partial((char *)uh,
763 sizeof(struct udphdr), tmp_csum);
764 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
765 &fl->fl6_dst,
766 up->len, fl->proto, tmp_csum);
767 uh->check = tmp_csum;
768
769 }
770 if (uh->check == 0)
771 uh->check = -1;
772
773 send:
774 err = ip6_push_pending_frames(sk);
775 out:
776 up->len = 0;
777 up->pending = 0;
778 return err;
779 }
780
781 static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
782 struct msghdr *msg, size_t len)
783 {
784 struct ipv6_txoptions opt_space;
785 struct udp_opt *up = udp_sk(sk);
786 struct inet_opt *inet = inet_sk(sk);
787 struct ipv6_pinfo *np = inet6_sk(sk);
788 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
789 struct in6_addr *daddr;
790 struct ipv6_txoptions *opt = NULL;
791 struct ip6_flowlabel *flowlabel = NULL;
792 struct flowi *fl = &inet->cork.fl;
793 struct dst_entry *dst;
794 int addr_len = msg->msg_namelen;
795 int ulen = len;
796 int hlimit = -1;
797 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
798 int err;
799
800 /* destination address check */
801 if (sin6) {
802 if (addr_len < offsetof(struct sockaddr, sa_data))
803 return -EINVAL;
804
805 switch (sin6->sin6_family) {
806 case AF_INET6:
807 if (addr_len < SIN6_LEN_RFC2133)
808 return -EINVAL;
809 daddr = &sin6->sin6_addr;
810 break;
811 case AF_INET:
812 goto do_udp_sendmsg;
813 case AF_UNSPEC:
814 msg->msg_name = sin6 = NULL;
815 msg->msg_namelen = addr_len = 0;
816 daddr = NULL;
817 break;
818 default:
819 return -EINVAL;
820 }
821 } else if (!up->pending) {
822 if (sk->sk_state != TCP_ESTABLISHED)
823 return -EDESTADDRREQ;
824 daddr = &np->daddr;
825 } else
826 daddr = NULL;
827
828 if (daddr) {
829 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
830 struct sockaddr_in sin;
831 sin.sin_family = AF_INET;
832 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
833 sin.sin_addr.s_addr = daddr->s6_addr32[3];
834 msg->msg_name = &sin;
835 msg->msg_namelen = sizeof(sin);
836 do_udp_sendmsg:
837 if (__ipv6_only_sock(sk))
838 return -ENETUNREACH;
839 return udp_sendmsg(iocb, sk, msg, len);
840 }
841 }
842
843 if (up->pending == AF_INET)
844 return udp_sendmsg(iocb, sk, msg, len);
845
846 /* Rough check on arithmetic overflow,
847 better check is made in ip6_build_xmit
848 */
849 if (len > INT_MAX - sizeof(struct udphdr))
850 return -EMSGSIZE;
851
852 if (up->pending) {
853 /*
854 * There are pending frames.
855 * The socket lock must be held while it's corked.
856 */
857 lock_sock(sk);
858 if (likely(up->pending)) {
859 if (unlikely(up->pending != AF_INET6)) {
860 release_sock(sk);
861 return -EINVAL;
862 }
863 dst = NULL;
864 goto do_append_data;
865 }
866 release_sock(sk);
867 }
868 ulen += sizeof(struct udphdr);
869
870 memset(fl, 0, sizeof(*fl));
871
872 if (sin6) {
873 if (sin6->sin6_port == 0)
874 return -EINVAL;
875
876 fl->fl_ip_dport = sin6->sin6_port;
877 daddr = &sin6->sin6_addr;
878
879 if (np->sndflow) {
880 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
881 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
882 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
883 if (flowlabel == NULL)
884 return -EINVAL;
885 daddr = &flowlabel->dst;
886 }
887 }
888
889 /*
890 * Otherwise it will be difficult to maintain
891 * sk->sk_dst_cache.
892 */
893 if (sk->sk_state == TCP_ESTABLISHED &&
894 !ipv6_addr_cmp(daddr, &np->daddr))
895 daddr = &np->daddr;
896
897 if (addr_len >= sizeof(struct sockaddr_in6) &&
898 sin6->sin6_scope_id &&
899 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
900 fl->oif = sin6->sin6_scope_id;
901 } else {
902 if (sk->sk_state != TCP_ESTABLISHED)
903 return -EDESTADDRREQ;
904
905 fl->fl_ip_dport = inet->dport;
906 daddr = &np->daddr;
907 fl->fl6_flowlabel = np->flow_label;
908 }
909
910 if (!fl->oif)
911 fl->oif = sk->sk_bound_dev_if;
912
913 if (msg->msg_controllen) {
914 opt = &opt_space;
915 memset(opt, 0, sizeof(struct ipv6_txoptions));
916
917 err = datagram_send_ctl(msg, fl, opt, &hlimit);
918 if (err < 0) {
919 fl6_sock_release(flowlabel);
920 return err;
921 }
922 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
923 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
924 if (flowlabel == NULL)
925 return -EINVAL;
926 }
927 if (!(opt->opt_nflen|opt->opt_flen))
928 opt = NULL;
929 }
930 if (opt == NULL)
931 opt = np->opt;
932 if (flowlabel)
933 opt = fl6_merge_options(&opt_space, flowlabel, opt);
934
935 fl->proto = IPPROTO_UDP;
936 ipv6_addr_copy(&fl->fl6_dst, daddr);
937 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
938 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
939 fl->fl_ip_sport = inet->sport;
940
941 /* merge ip6_build_xmit from ip6_output */
942 if (opt && opt->srcrt) {
943 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
944 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
945 }
946
947 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
948 fl->oif = np->mcast_oif;
949
950 err = ip6_dst_lookup(sk, &dst, fl);
951 if (err)
952 goto out;
953
954 if (hlimit < 0) {
955 if (ipv6_addr_is_multicast(&fl->fl6_dst))
956 hlimit = np->mcast_hops;
957 else
958 hlimit = np->hop_limit;
959 if (hlimit < 0)
960 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
961 }
962
963 if (msg->msg_flags&MSG_CONFIRM)
964 goto do_confirm;
965 back_from_confirm:
966
967 lock_sock(sk);
968 if (unlikely(up->pending)) {
969 /* The socket is already corked while preparing it. */
970 /* ... which is an evident application bug. --ANK */
971 release_sock(sk);
972
973 LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
974 err = -EINVAL;
975 goto out;
976 }
977
978 up->pending = AF_INET6;
979
980 do_append_data:
981 up->len += ulen;
982 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
983 hlimit, opt, fl, (struct rt6_info*)dst,
984 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
985 if (err)
986 udp_v6_flush_pending_frames(sk);
987 else if (!corkreq)
988 err = udp_v6_push_pending_frames(sk, up);
989
990 if (dst)
991 ip6_dst_store(sk, dst,
992 !ipv6_addr_cmp(&fl->fl6_dst, &np->daddr) ?
993 &np->daddr : NULL);
994 if (err > 0)
995 err = np->recverr ? net_xmit_errno(err) : 0;
996 release_sock(sk);
997 out:
998 fl6_sock_release(flowlabel);
999 if (!err) {
1000 UDP6_INC_STATS_USER(UdpOutDatagrams);
1001 return len;
1002 }
1003 return err;
1004
1005 do_confirm:
1006 dst_confirm(dst);
1007 if (!(msg->msg_flags&MSG_PROBE) || len)
1008 goto back_from_confirm;
1009 err = 0;
1010 goto out;
1011 }
1012
1013 static int udpv6_destroy_sock(struct sock *sk)
1014 {
1015 lock_sock(sk);
1016 udp_v6_flush_pending_frames(sk);
1017 release_sock(sk);
1018
1019 inet6_destroy_sock(sk);
1020
1021 return 0;
1022 }
1023
1024 /*
1025 * Socket option code for UDP
1026 */
1027 static int udpv6_setsockopt(struct sock *sk, int level, int optname,
1028 char *optval, int optlen)
1029 {
1030 struct udp_opt *up = udp_sk(sk);
1031 int val;
1032 int err = 0;
1033
1034 if (level != SOL_UDP)
1035 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1036
1037 if(optlen<sizeof(int))
1038 return -EINVAL;
1039
1040 if (get_user(val, (int *)optval))
1041 return -EFAULT;
1042
1043 switch(optname) {
1044 case UDP_CORK:
1045 if (val != 0) {
1046 up->corkflag = 1;
1047 } else {
1048 up->corkflag = 0;
1049 lock_sock(sk);
1050 udp_v6_push_pending_frames(sk, up);
1051 release_sock(sk);
1052 }
1053 break;
1054
1055 case UDP_ENCAP:
1056 up->encap_type = val;
1057 break;
1058
1059 default:
1060 err = -ENOPROTOOPT;
1061 break;
1062 };
1063
1064 return err;
1065 }
1066
1067 static int udpv6_getsockopt(struct sock *sk, int level, int optname,
1068 char *optval, int *optlen)
1069 {
1070 struct udp_opt *up = udp_sk(sk);
1071 int val, len;
1072
1073 if (level != SOL_UDP)
1074 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1075
1076 if(get_user(len,optlen))
1077 return -EFAULT;
1078
1079 len = min_t(unsigned int, len, sizeof(int));
1080
1081 if(len < 0)
1082 return -EINVAL;
1083
1084 switch(optname) {
1085 case UDP_CORK:
1086 val = up->corkflag;
1087 break;
1088
1089 case UDP_ENCAP:
1090 val = up->encap_type;
1091 break;
1092
1093 default:
1094 return -ENOPROTOOPT;
1095 };
1096
1097 if(put_user(len, optlen))
1098 return -EFAULT;
1099 if(copy_to_user(optval, &val,len))
1100 return -EFAULT;
1101 return 0;
1102 }
1103
1104 static struct inet6_protocol udpv6_protocol = {
1105 .handler = udpv6_rcv,
1106 .err_handler = udpv6_err,
1107 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1108 };
1109
1110 /* ------------------------------------------------------------------------ */
1111 #ifdef CONFIG_PROC_FS
1112
1113 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1114 {
1115 struct inet_opt *inet = inet_sk(sp);
1116 struct ipv6_pinfo *np = inet6_sk(sp);
1117 struct in6_addr *dest, *src;
1118 __u16 destp, srcp;
1119
1120 dest = &np->daddr;
1121 src = &np->rcv_saddr;
1122 destp = ntohs(inet->dport);
1123 srcp = ntohs(inet->sport);
1124 seq_printf(seq,
1125 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1126 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1127 bucket,
1128 src->s6_addr32[0], src->s6_addr32[1],
1129 src->s6_addr32[2], src->s6_addr32[3], srcp,
1130 dest->s6_addr32[0], dest->s6_addr32[1],
1131 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1132 sp->sk_state,
1133 atomic_read(&sp->sk_wmem_alloc),
1134 atomic_read(&sp->sk_rmem_alloc),
1135 0, 0L, 0,
1136 sock_i_uid(sp), 0,
1137 sock_i_ino(sp),
1138 atomic_read(&sp->sk_refcnt), sp);
1139 }
1140
1141 static int udp6_seq_show(struct seq_file *seq, void *v)
1142 {
1143 if (v == SEQ_START_TOKEN)
1144 seq_printf(seq,
1145 " sl "
1146 "local_address "
1147 "remote_address "
1148 "st tx_queue rx_queue tr tm->when retrnsmt"
1149 " uid timeout inode\n");
1150 else
1151 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1152 return 0;
1153 }
1154
1155 static struct file_operations udp6_seq_fops;
1156 static struct udp_seq_afinfo udp6_seq_afinfo = {
1157 .owner = THIS_MODULE,
1158 .name = "udp6",
1159 .family = AF_INET6,
1160 .seq_show = udp6_seq_show,
1161 .seq_fops = &udp6_seq_fops,
1162 };
1163
1164 int __init udp6_proc_init(void)
1165 {
1166 return udp_proc_register(&udp6_seq_afinfo);
1167 }
1168
1169 void udp6_proc_exit(void) {
1170 udp_proc_unregister(&udp6_seq_afinfo);
1171 }
1172 #endif /* CONFIG_PROC_FS */
1173
1174 /* ------------------------------------------------------------------------ */
1175
1176 struct proto udpv6_prot = {
1177 .name = "UDP",
1178 .close = udpv6_close,
1179 .connect = udpv6_connect,
1180 .disconnect = udp_disconnect,
1181 .ioctl = udp_ioctl,
1182 .destroy = udpv6_destroy_sock,
1183 .setsockopt = udpv6_setsockopt,
1184 .getsockopt = udpv6_getsockopt,
1185 .sendmsg = udpv6_sendmsg,
1186 .recvmsg = udpv6_recvmsg,
1187 .backlog_rcv = udpv6_queue_rcv_skb,
1188 .hash = udp_v6_hash,
1189 .unhash = udp_v6_unhash,
1190 .get_port = udp_v6_get_port,
1191 };
1192
1193 extern struct proto_ops inet6_dgram_ops;
1194
1195 static struct inet_protosw udpv6_protosw = {
1196 .type = SOCK_DGRAM,
1197 .protocol = IPPROTO_UDP,
1198 .prot = &udpv6_prot,
1199 .ops = &inet6_dgram_ops,
1200 .capability =-1,
1201 .no_check = UDP_CSUM_DEFAULT,
1202 .flags = INET_PROTOSW_PERMANENT,
1203 };
1204
1205
1206 void __init udpv6_init(void)
1207 {
1208 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1209 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1210 inet6_register_protosw(&udpv6_protosw);
1211 }
Historical 2.5/2.6 development