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[NET_SCHED]: cls_basic: fix memory leak in basic_destroy
[deliverable/linux.git] / net / ipv6 / udp.c
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/net.h>
31 #include <linux/in6.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/ipv6.h>
35 #include <linux/icmpv6.h>
36 #include <linux/init.h>
37 #include <linux/skbuff.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include "udp_impl.h"
52
53 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
54
55 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
56 {
57 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
58 }
59
60 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
61 struct in6_addr *daddr, __be16 dport,
62 int dif, struct hlist_head udptable[])
63 {
64 struct sock *sk, *result = NULL;
65 struct hlist_node *node;
66 unsigned short hnum = ntohs(dport);
67 int badness = -1;
68
69 read_lock(&udp_hash_lock);
70 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
71 struct inet_sock *inet = inet_sk(sk);
72
73 if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
74 struct ipv6_pinfo *np = inet6_sk(sk);
75 int score = 0;
76 if (inet->dport) {
77 if (inet->dport != sport)
78 continue;
79 score++;
80 }
81 if (!ipv6_addr_any(&np->rcv_saddr)) {
82 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
83 continue;
84 score++;
85 }
86 if (!ipv6_addr_any(&np->daddr)) {
87 if (!ipv6_addr_equal(&np->daddr, saddr))
88 continue;
89 score++;
90 }
91 if (sk->sk_bound_dev_if) {
92 if (sk->sk_bound_dev_if != dif)
93 continue;
94 score++;
95 }
96 if(score == 4) {
97 result = sk;
98 break;
99 } else if(score > badness) {
100 result = sk;
101 badness = score;
102 }
103 }
104 }
105 if (result)
106 sock_hold(result);
107 read_unlock(&udp_hash_lock);
108 return result;
109 }
110
111 /*
112 * This should be easy, if there is something there we
113 * return it, otherwise we block.
114 */
115
116 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
117 struct msghdr *msg, size_t len,
118 int noblock, int flags, int *addr_len)
119 {
120 struct ipv6_pinfo *np = inet6_sk(sk);
121 struct inet_sock *inet = inet_sk(sk);
122 struct sk_buff *skb;
123 size_t copied;
124 int err, copy_only, is_udplite = IS_UDPLITE(sk);
125
126 if (addr_len)
127 *addr_len=sizeof(struct sockaddr_in6);
128
129 if (flags & MSG_ERRQUEUE)
130 return ipv6_recv_error(sk, msg, len);
131
132 try_again:
133 skb = skb_recv_datagram(sk, flags, noblock, &err);
134 if (!skb)
135 goto out;
136
137 copied = skb->len - sizeof(struct udphdr);
138 if (copied > len) {
139 copied = len;
140 msg->msg_flags |= MSG_TRUNC;
141 }
142
143 /*
144 * Decide whether to checksum and/or copy data.
145 */
146 copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY);
147
148 if (is_udplite || (!copy_only && msg->msg_flags&MSG_TRUNC)) {
149 if (__udp_lib_checksum_complete(skb))
150 goto csum_copy_err;
151 copy_only = 1;
152 }
153
154 if (copy_only)
155 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
156 msg->msg_iov, copied );
157 else {
158 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
159 if (err == -EINVAL)
160 goto csum_copy_err;
161 }
162 if (err)
163 goto out_free;
164
165 sock_recv_timestamp(msg, sk, skb);
166
167 /* Copy the address. */
168 if (msg->msg_name) {
169 struct sockaddr_in6 *sin6;
170
171 sin6 = (struct sockaddr_in6 *) msg->msg_name;
172 sin6->sin6_family = AF_INET6;
173 sin6->sin6_port = skb->h.uh->source;
174 sin6->sin6_flowinfo = 0;
175 sin6->sin6_scope_id = 0;
176
177 if (skb->protocol == htons(ETH_P_IP))
178 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
179 htonl(0xffff), skb->nh.iph->saddr);
180 else {
181 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
182 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
183 sin6->sin6_scope_id = IP6CB(skb)->iif;
184 }
185
186 }
187 if (skb->protocol == htons(ETH_P_IP)) {
188 if (inet->cmsg_flags)
189 ip_cmsg_recv(msg, skb);
190 } else {
191 if (np->rxopt.all)
192 datagram_recv_ctl(sk, msg, skb);
193 }
194
195 err = copied;
196 if (flags & MSG_TRUNC)
197 err = skb->len - sizeof(struct udphdr);
198
199 out_free:
200 skb_free_datagram(sk, skb);
201 out:
202 return err;
203
204 csum_copy_err:
205 skb_kill_datagram(sk, skb, flags);
206
207 if (flags & MSG_DONTWAIT) {
208 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
209 return -EAGAIN;
210 }
211 goto try_again;
212 }
213
214 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
215 int type, int code, int offset, __be32 info,
216 struct hlist_head udptable[] )
217 {
218 struct ipv6_pinfo *np;
219 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
220 struct in6_addr *saddr = &hdr->saddr;
221 struct in6_addr *daddr = &hdr->daddr;
222 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
223 struct sock *sk;
224 int err;
225
226 sk = __udp6_lib_lookup(daddr, uh->dest,
227 saddr, uh->source, inet6_iif(skb), udptable);
228 if (sk == NULL)
229 return;
230
231 np = inet6_sk(sk);
232
233 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
234 goto out;
235
236 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
237 goto out;
238
239 if (np->recverr)
240 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
241
242 sk->sk_err = err;
243 sk->sk_error_report(sk);
244 out:
245 sock_put(sk);
246 }
247
248 static __inline__ void udpv6_err(struct sk_buff *skb,
249 struct inet6_skb_parm *opt, int type,
250 int code, int offset, __be32 info )
251 {
252 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
253 }
254
255 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
256 {
257 struct udp_sock *up = udp_sk(sk);
258 int rc;
259
260 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
261 goto drop;
262
263 /*
264 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
265 */
266 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
267
268 if (up->pcrlen == 0) { /* full coverage was set */
269 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
270 " %d while full coverage %d requested\n",
271 UDP_SKB_CB(skb)->cscov, skb->len);
272 goto drop;
273 }
274 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
275 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
276 "too small, need min %d\n",
277 UDP_SKB_CB(skb)->cscov, up->pcrlen);
278 goto drop;
279 }
280 }
281
282 if (udp_lib_checksum_complete(skb))
283 goto drop;
284
285 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
286 /* Note that an ENOMEM error is charged twice */
287 if (rc == -ENOMEM)
288 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
289 goto drop;
290 }
291 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
292 return 0;
293 drop:
294 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
295 kfree_skb(skb);
296 return -1;
297 }
298
299 static struct sock *udp_v6_mcast_next(struct sock *sk,
300 __be16 loc_port, struct in6_addr *loc_addr,
301 __be16 rmt_port, struct in6_addr *rmt_addr,
302 int dif)
303 {
304 struct hlist_node *node;
305 struct sock *s = sk;
306 unsigned short num = ntohs(loc_port);
307
308 sk_for_each_from(s, node) {
309 struct inet_sock *inet = inet_sk(s);
310
311 if (s->sk_hash == num && s->sk_family == PF_INET6) {
312 struct ipv6_pinfo *np = inet6_sk(s);
313 if (inet->dport) {
314 if (inet->dport != rmt_port)
315 continue;
316 }
317 if (!ipv6_addr_any(&np->daddr) &&
318 !ipv6_addr_equal(&np->daddr, rmt_addr))
319 continue;
320
321 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
322 continue;
323
324 if (!ipv6_addr_any(&np->rcv_saddr)) {
325 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
326 continue;
327 }
328 if(!inet6_mc_check(s, loc_addr, rmt_addr))
329 continue;
330 return s;
331 }
332 }
333 return NULL;
334 }
335
336 /*
337 * Note: called only from the BH handler context,
338 * so we don't need to lock the hashes.
339 */
340 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
341 struct in6_addr *daddr, struct hlist_head udptable[])
342 {
343 struct sock *sk, *sk2;
344 const struct udphdr *uh = skb->h.uh;
345 int dif;
346
347 read_lock(&udp_hash_lock);
348 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
349 dif = inet6_iif(skb);
350 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
351 if (!sk) {
352 kfree_skb(skb);
353 goto out;
354 }
355
356 sk2 = sk;
357 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
358 uh->source, saddr, dif))) {
359 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
360 if (buff)
361 udpv6_queue_rcv_skb(sk2, buff);
362 }
363 udpv6_queue_rcv_skb(sk, skb);
364 out:
365 read_unlock(&udp_hash_lock);
366 return 0;
367 }
368
369 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh)
370
371 {
372 if (uh->check == 0) {
373 /* RFC 2460 section 8.1 says that we SHOULD log
374 this error. Well, it is reasonable.
375 */
376 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
377 return 1;
378 }
379 if (skb->ip_summed == CHECKSUM_COMPLETE &&
380 !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
381 skb->len, IPPROTO_UDP, skb->csum ))
382 skb->ip_summed = CHECKSUM_UNNECESSARY;
383
384 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
385 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
386 &skb->nh.ipv6h->daddr,
387 skb->len, IPPROTO_UDP,
388 0));
389
390 return (UDP_SKB_CB(skb)->partial_cov = 0);
391 }
392
393 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
394 int is_udplite)
395 {
396 struct sk_buff *skb = *pskb;
397 struct sock *sk;
398 struct udphdr *uh;
399 struct net_device *dev = skb->dev;
400 struct in6_addr *saddr, *daddr;
401 u32 ulen = 0;
402
403 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
404 goto short_packet;
405
406 saddr = &skb->nh.ipv6h->saddr;
407 daddr = &skb->nh.ipv6h->daddr;
408 uh = skb->h.uh;
409
410 ulen = ntohs(uh->len);
411 if (ulen > skb->len)
412 goto short_packet;
413
414 if(! is_udplite ) { /* UDP validates ulen. */
415
416 /* Check for jumbo payload */
417 if (ulen == 0)
418 ulen = skb->len;
419
420 if (ulen < sizeof(*uh))
421 goto short_packet;
422
423 if (ulen < skb->len) {
424 if (pskb_trim_rcsum(skb, ulen))
425 goto short_packet;
426 saddr = &skb->nh.ipv6h->saddr;
427 daddr = &skb->nh.ipv6h->daddr;
428 uh = skb->h.uh;
429 }
430
431 if (udp6_csum_init(skb, uh))
432 goto discard;
433
434 } else { /* UDP-Lite validates cscov. */
435 if (udplite6_csum_init(skb, uh))
436 goto discard;
437 }
438
439 /*
440 * Multicast receive code
441 */
442 if (ipv6_addr_is_multicast(daddr))
443 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
444
445 /* Unicast */
446
447 /*
448 * check socket cache ... must talk to Alan about his plans
449 * for sock caches... i'll skip this for now.
450 */
451 sk = __udp6_lib_lookup(saddr, uh->source,
452 daddr, uh->dest, inet6_iif(skb), udptable);
453
454 if (sk == NULL) {
455 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
456 goto discard;
457
458 if (udp_lib_checksum_complete(skb))
459 goto discard;
460 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
461
462 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
463
464 kfree_skb(skb);
465 return(0);
466 }
467
468 /* deliver */
469
470 udpv6_queue_rcv_skb(sk, skb);
471 sock_put(sk);
472 return(0);
473
474 short_packet:
475 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
476 is_udplite? "-Lite" : "", ulen, skb->len);
477
478 discard:
479 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
480 kfree_skb(skb);
481 return(0);
482 }
483
484 static __inline__ int udpv6_rcv(struct sk_buff **pskb)
485 {
486 return __udp6_lib_rcv(pskb, udp_hash, 0);
487 }
488
489 /*
490 * Throw away all pending data and cancel the corking. Socket is locked.
491 */
492 static void udp_v6_flush_pending_frames(struct sock *sk)
493 {
494 struct udp_sock *up = udp_sk(sk);
495
496 if (up->pending) {
497 up->len = 0;
498 up->pending = 0;
499 ip6_flush_pending_frames(sk);
500 }
501 }
502
503 /*
504 * Sending
505 */
506
507 static int udp_v6_push_pending_frames(struct sock *sk)
508 {
509 struct sk_buff *skb;
510 struct udphdr *uh;
511 struct udp_sock *up = udp_sk(sk);
512 struct inet_sock *inet = inet_sk(sk);
513 struct flowi *fl = &inet->cork.fl;
514 int err = 0;
515 __wsum csum = 0;
516
517 /* Grab the skbuff where UDP header space exists. */
518 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
519 goto out;
520
521 /*
522 * Create a UDP header
523 */
524 uh = skb->h.uh;
525 uh->source = fl->fl_ip_sport;
526 uh->dest = fl->fl_ip_dport;
527 uh->len = htons(up->len);
528 uh->check = 0;
529
530 if (up->pcflag)
531 csum = udplite_csum_outgoing(sk, skb);
532 else
533 csum = udp_csum_outgoing(sk, skb);
534
535 /* add protocol-dependent pseudo-header */
536 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
537 up->len, fl->proto, csum );
538 if (uh->check == 0)
539 uh->check = CSUM_MANGLED_0;
540
541 err = ip6_push_pending_frames(sk);
542 out:
543 up->len = 0;
544 up->pending = 0;
545 return err;
546 }
547
548 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
549 struct msghdr *msg, size_t len)
550 {
551 struct ipv6_txoptions opt_space;
552 struct udp_sock *up = udp_sk(sk);
553 struct inet_sock *inet = inet_sk(sk);
554 struct ipv6_pinfo *np = inet6_sk(sk);
555 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
556 struct in6_addr *daddr, *final_p = NULL, final;
557 struct ipv6_txoptions *opt = NULL;
558 struct ip6_flowlabel *flowlabel = NULL;
559 struct flowi fl;
560 struct dst_entry *dst;
561 int addr_len = msg->msg_namelen;
562 int ulen = len;
563 int hlimit = -1;
564 int tclass = -1;
565 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
566 int err;
567 int connected = 0;
568 int is_udplite = up->pcflag;
569 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
570
571 /* destination address check */
572 if (sin6) {
573 if (addr_len < offsetof(struct sockaddr, sa_data))
574 return -EINVAL;
575
576 switch (sin6->sin6_family) {
577 case AF_INET6:
578 if (addr_len < SIN6_LEN_RFC2133)
579 return -EINVAL;
580 daddr = &sin6->sin6_addr;
581 break;
582 case AF_INET:
583 goto do_udp_sendmsg;
584 case AF_UNSPEC:
585 msg->msg_name = sin6 = NULL;
586 msg->msg_namelen = addr_len = 0;
587 daddr = NULL;
588 break;
589 default:
590 return -EINVAL;
591 }
592 } else if (!up->pending) {
593 if (sk->sk_state != TCP_ESTABLISHED)
594 return -EDESTADDRREQ;
595 daddr = &np->daddr;
596 } else
597 daddr = NULL;
598
599 if (daddr) {
600 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
601 struct sockaddr_in sin;
602 sin.sin_family = AF_INET;
603 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
604 sin.sin_addr.s_addr = daddr->s6_addr32[3];
605 msg->msg_name = &sin;
606 msg->msg_namelen = sizeof(sin);
607 do_udp_sendmsg:
608 if (__ipv6_only_sock(sk))
609 return -ENETUNREACH;
610 return udp_sendmsg(iocb, sk, msg, len);
611 }
612 }
613
614 if (up->pending == AF_INET)
615 return udp_sendmsg(iocb, sk, msg, len);
616
617 /* Rough check on arithmetic overflow,
618 better check is made in ip6_build_xmit
619 */
620 if (len > INT_MAX - sizeof(struct udphdr))
621 return -EMSGSIZE;
622
623 if (up->pending) {
624 /*
625 * There are pending frames.
626 * The socket lock must be held while it's corked.
627 */
628 lock_sock(sk);
629 if (likely(up->pending)) {
630 if (unlikely(up->pending != AF_INET6)) {
631 release_sock(sk);
632 return -EAFNOSUPPORT;
633 }
634 dst = NULL;
635 goto do_append_data;
636 }
637 release_sock(sk);
638 }
639 ulen += sizeof(struct udphdr);
640
641 memset(&fl, 0, sizeof(fl));
642
643 if (sin6) {
644 if (sin6->sin6_port == 0)
645 return -EINVAL;
646
647 fl.fl_ip_dport = sin6->sin6_port;
648 daddr = &sin6->sin6_addr;
649
650 if (np->sndflow) {
651 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
652 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
653 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
654 if (flowlabel == NULL)
655 return -EINVAL;
656 daddr = &flowlabel->dst;
657 }
658 }
659
660 /*
661 * Otherwise it will be difficult to maintain
662 * sk->sk_dst_cache.
663 */
664 if (sk->sk_state == TCP_ESTABLISHED &&
665 ipv6_addr_equal(daddr, &np->daddr))
666 daddr = &np->daddr;
667
668 if (addr_len >= sizeof(struct sockaddr_in6) &&
669 sin6->sin6_scope_id &&
670 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
671 fl.oif = sin6->sin6_scope_id;
672 } else {
673 if (sk->sk_state != TCP_ESTABLISHED)
674 return -EDESTADDRREQ;
675
676 fl.fl_ip_dport = inet->dport;
677 daddr = &np->daddr;
678 fl.fl6_flowlabel = np->flow_label;
679 connected = 1;
680 }
681
682 if (!fl.oif)
683 fl.oif = sk->sk_bound_dev_if;
684
685 if (msg->msg_controllen) {
686 opt = &opt_space;
687 memset(opt, 0, sizeof(struct ipv6_txoptions));
688 opt->tot_len = sizeof(*opt);
689
690 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
691 if (err < 0) {
692 fl6_sock_release(flowlabel);
693 return err;
694 }
695 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
696 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
697 if (flowlabel == NULL)
698 return -EINVAL;
699 }
700 if (!(opt->opt_nflen|opt->opt_flen))
701 opt = NULL;
702 connected = 0;
703 }
704 if (opt == NULL)
705 opt = np->opt;
706 if (flowlabel)
707 opt = fl6_merge_options(&opt_space, flowlabel, opt);
708 opt = ipv6_fixup_options(&opt_space, opt);
709
710 fl.proto = sk->sk_protocol;
711 ipv6_addr_copy(&fl.fl6_dst, daddr);
712 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
713 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
714 fl.fl_ip_sport = inet->sport;
715
716 /* merge ip6_build_xmit from ip6_output */
717 if (opt && opt->srcrt) {
718 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
719 ipv6_addr_copy(&final, &fl.fl6_dst);
720 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
721 final_p = &final;
722 connected = 0;
723 }
724
725 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
726 fl.oif = np->mcast_oif;
727 connected = 0;
728 }
729
730 security_sk_classify_flow(sk, &fl);
731
732 err = ip6_sk_dst_lookup(sk, &dst, &fl);
733 if (err)
734 goto out;
735 if (final_p)
736 ipv6_addr_copy(&fl.fl6_dst, final_p);
737
738 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
739 goto out;
740
741 if (hlimit < 0) {
742 if (ipv6_addr_is_multicast(&fl.fl6_dst))
743 hlimit = np->mcast_hops;
744 else
745 hlimit = np->hop_limit;
746 if (hlimit < 0)
747 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
748 if (hlimit < 0)
749 hlimit = ipv6_get_hoplimit(dst->dev);
750 }
751
752 if (tclass < 0) {
753 tclass = np->tclass;
754 if (tclass < 0)
755 tclass = 0;
756 }
757
758 if (msg->msg_flags&MSG_CONFIRM)
759 goto do_confirm;
760 back_from_confirm:
761
762 lock_sock(sk);
763 if (unlikely(up->pending)) {
764 /* The socket is already corked while preparing it. */
765 /* ... which is an evident application bug. --ANK */
766 release_sock(sk);
767
768 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
769 err = -EINVAL;
770 goto out;
771 }
772
773 up->pending = AF_INET6;
774
775 do_append_data:
776 up->len += ulen;
777 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
778 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
779 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
780 (struct rt6_info*)dst,
781 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
782 if (err)
783 udp_v6_flush_pending_frames(sk);
784 else if (!corkreq)
785 err = udp_v6_push_pending_frames(sk);
786 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
787 up->pending = 0;
788
789 if (dst) {
790 if (connected) {
791 ip6_dst_store(sk, dst,
792 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
793 &np->daddr : NULL,
794 #ifdef CONFIG_IPV6_SUBTREES
795 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
796 &np->saddr :
797 #endif
798 NULL);
799 } else {
800 dst_release(dst);
801 }
802 }
803
804 if (err > 0)
805 err = np->recverr ? net_xmit_errno(err) : 0;
806 release_sock(sk);
807 out:
808 fl6_sock_release(flowlabel);
809 if (!err) {
810 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
811 return len;
812 }
813 /*
814 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
815 * ENOBUFS might not be good (it's not tunable per se), but otherwise
816 * we don't have a good statistic (IpOutDiscards but it can be too many
817 * things). We could add another new stat but at least for now that
818 * seems like overkill.
819 */
820 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
821 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
822 }
823 return err;
824
825 do_confirm:
826 dst_confirm(dst);
827 if (!(msg->msg_flags&MSG_PROBE) || len)
828 goto back_from_confirm;
829 err = 0;
830 goto out;
831 }
832
833 int udpv6_destroy_sock(struct sock *sk)
834 {
835 lock_sock(sk);
836 udp_v6_flush_pending_frames(sk);
837 release_sock(sk);
838
839 inet6_destroy_sock(sk);
840
841 return 0;
842 }
843
844 /*
845 * Socket option code for UDP
846 */
847 int udpv6_setsockopt(struct sock *sk, int level, int optname,
848 char __user *optval, int optlen)
849 {
850 if (level == SOL_UDP || level == SOL_UDPLITE)
851 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
852 udp_v6_push_pending_frames);
853 return ipv6_setsockopt(sk, level, optname, optval, optlen);
854 }
855
856 #ifdef CONFIG_COMPAT
857 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
858 char __user *optval, int optlen)
859 {
860 if (level == SOL_UDP || level == SOL_UDPLITE)
861 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
862 udp_v6_push_pending_frames);
863 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
864 }
865 #endif
866
867 int udpv6_getsockopt(struct sock *sk, int level, int optname,
868 char __user *optval, int __user *optlen)
869 {
870 if (level == SOL_UDP || level == SOL_UDPLITE)
871 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
872 return ipv6_getsockopt(sk, level, optname, optval, optlen);
873 }
874
875 #ifdef CONFIG_COMPAT
876 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
877 char __user *optval, int __user *optlen)
878 {
879 if (level == SOL_UDP || level == SOL_UDPLITE)
880 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
881 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
882 }
883 #endif
884
885 static struct inet6_protocol udpv6_protocol = {
886 .handler = udpv6_rcv,
887 .err_handler = udpv6_err,
888 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
889 };
890
891 /* ------------------------------------------------------------------------ */
892 #ifdef CONFIG_PROC_FS
893
894 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
895 {
896 struct inet_sock *inet = inet_sk(sp);
897 struct ipv6_pinfo *np = inet6_sk(sp);
898 struct in6_addr *dest, *src;
899 __u16 destp, srcp;
900
901 dest = &np->daddr;
902 src = &np->rcv_saddr;
903 destp = ntohs(inet->dport);
904 srcp = ntohs(inet->sport);
905 seq_printf(seq,
906 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
907 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
908 bucket,
909 src->s6_addr32[0], src->s6_addr32[1],
910 src->s6_addr32[2], src->s6_addr32[3], srcp,
911 dest->s6_addr32[0], dest->s6_addr32[1],
912 dest->s6_addr32[2], dest->s6_addr32[3], destp,
913 sp->sk_state,
914 atomic_read(&sp->sk_wmem_alloc),
915 atomic_read(&sp->sk_rmem_alloc),
916 0, 0L, 0,
917 sock_i_uid(sp), 0,
918 sock_i_ino(sp),
919 atomic_read(&sp->sk_refcnt), sp);
920 }
921
922 int udp6_seq_show(struct seq_file *seq, void *v)
923 {
924 if (v == SEQ_START_TOKEN)
925 seq_printf(seq,
926 " sl "
927 "local_address "
928 "remote_address "
929 "st tx_queue rx_queue tr tm->when retrnsmt"
930 " uid timeout inode\n");
931 else
932 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
933 return 0;
934 }
935
936 static struct file_operations udp6_seq_fops;
937 static struct udp_seq_afinfo udp6_seq_afinfo = {
938 .owner = THIS_MODULE,
939 .name = "udp6",
940 .family = AF_INET6,
941 .hashtable = udp_hash,
942 .seq_show = udp6_seq_show,
943 .seq_fops = &udp6_seq_fops,
944 };
945
946 int __init udp6_proc_init(void)
947 {
948 return udp_proc_register(&udp6_seq_afinfo);
949 }
950
951 void udp6_proc_exit(void) {
952 udp_proc_unregister(&udp6_seq_afinfo);
953 }
954 #endif /* CONFIG_PROC_FS */
955
956 /* ------------------------------------------------------------------------ */
957
958 struct proto udpv6_prot = {
959 .name = "UDPv6",
960 .owner = THIS_MODULE,
961 .close = udp_lib_close,
962 .connect = ip6_datagram_connect,
963 .disconnect = udp_disconnect,
964 .ioctl = udp_ioctl,
965 .destroy = udpv6_destroy_sock,
966 .setsockopt = udpv6_setsockopt,
967 .getsockopt = udpv6_getsockopt,
968 .sendmsg = udpv6_sendmsg,
969 .recvmsg = udpv6_recvmsg,
970 .backlog_rcv = udpv6_queue_rcv_skb,
971 .hash = udp_lib_hash,
972 .unhash = udp_lib_unhash,
973 .get_port = udp_v6_get_port,
974 .obj_size = sizeof(struct udp6_sock),
975 #ifdef CONFIG_COMPAT
976 .compat_setsockopt = compat_udpv6_setsockopt,
977 .compat_getsockopt = compat_udpv6_getsockopt,
978 #endif
979 };
980
981 static struct inet_protosw udpv6_protosw = {
982 .type = SOCK_DGRAM,
983 .protocol = IPPROTO_UDP,
984 .prot = &udpv6_prot,
985 .ops = &inet6_dgram_ops,
986 .capability =-1,
987 .no_check = UDP_CSUM_DEFAULT,
988 .flags = INET_PROTOSW_PERMANENT,
989 };
990
991
992 void __init udpv6_init(void)
993 {
994 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
995 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
996 inet6_register_protosw(&udpv6_protosw);
997 }
Linux kernel - Deliverables
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