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[NET]: Treat CHECKSUM_PARTIAL as CHECKSUM_UNNECESSARY
[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 unsigned int ulen, copied;
124 int err;
125 int is_udplite = IS_UDPLITE(sk);
126
127 if (addr_len)
128 *addr_len=sizeof(struct sockaddr_in6);
129
130 if (flags & MSG_ERRQUEUE)
131 return ipv6_recv_error(sk, msg, len);
132
133 try_again:
134 skb = skb_recv_datagram(sk, flags, noblock, &err);
135 if (!skb)
136 goto out;
137
138 ulen = skb->len - sizeof(struct udphdr);
139 copied = len;
140 if (copied > ulen)
141 copied = ulen;
142 else if (copied < ulen)
143 msg->msg_flags |= MSG_TRUNC;
144
145 /*
146 * If checksum is needed at all, try to do it while copying the
147 * data. If the data is truncated, or if we only want a partial
148 * coverage checksum (UDP-Lite), do it before the copy.
149 */
150
151 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
152 if (udp_lib_checksum_complete(skb))
153 goto csum_copy_err;
154 }
155
156 if (skb_csum_unnecessary(skb))
157 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
158 msg->msg_iov, copied );
159 else {
160 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
161 if (err == -EINVAL)
162 goto csum_copy_err;
163 }
164 if (err)
165 goto out_free;
166
167 sock_recv_timestamp(msg, sk, skb);
168
169 /* Copy the address. */
170 if (msg->msg_name) {
171 struct sockaddr_in6 *sin6;
172
173 sin6 = (struct sockaddr_in6 *) msg->msg_name;
174 sin6->sin6_family = AF_INET6;
175 sin6->sin6_port = udp_hdr(skb)->source;
176 sin6->sin6_flowinfo = 0;
177 sin6->sin6_scope_id = 0;
178
179 if (skb->protocol == htons(ETH_P_IP))
180 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
181 htonl(0xffff), ip_hdr(skb)->saddr);
182 else {
183 ipv6_addr_copy(&sin6->sin6_addr,
184 &ipv6_hdr(skb)->saddr);
185 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
186 sin6->sin6_scope_id = IP6CB(skb)->iif;
187 }
188
189 }
190 if (skb->protocol == htons(ETH_P_IP)) {
191 if (inet->cmsg_flags)
192 ip_cmsg_recv(msg, skb);
193 } else {
194 if (np->rxopt.all)
195 datagram_recv_ctl(sk, msg, skb);
196 }
197
198 err = copied;
199 if (flags & MSG_TRUNC)
200 err = ulen;
201
202 out_free:
203 skb_free_datagram(sk, skb);
204 out:
205 return err;
206
207 csum_copy_err:
208 skb_kill_datagram(sk, skb, flags);
209
210 if (flags & MSG_DONTWAIT) {
211 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
212 return -EAGAIN;
213 }
214 goto try_again;
215 }
216
217 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
218 int type, int code, int offset, __be32 info,
219 struct hlist_head udptable[] )
220 {
221 struct ipv6_pinfo *np;
222 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
223 struct in6_addr *saddr = &hdr->saddr;
224 struct in6_addr *daddr = &hdr->daddr;
225 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
226 struct sock *sk;
227 int err;
228
229 sk = __udp6_lib_lookup(daddr, uh->dest,
230 saddr, uh->source, inet6_iif(skb), udptable);
231 if (sk == NULL)
232 return;
233
234 np = inet6_sk(sk);
235
236 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
237 goto out;
238
239 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
240 goto out;
241
242 if (np->recverr)
243 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
244
245 sk->sk_err = err;
246 sk->sk_error_report(sk);
247 out:
248 sock_put(sk);
249 }
250
251 static __inline__ void udpv6_err(struct sk_buff *skb,
252 struct inet6_skb_parm *opt, int type,
253 int code, int offset, __be32 info )
254 {
255 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
256 }
257
258 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
259 {
260 struct udp_sock *up = udp_sk(sk);
261 int rc;
262
263 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
264 goto drop;
265
266 /*
267 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
268 */
269 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
270
271 if (up->pcrlen == 0) { /* full coverage was set */
272 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
273 " %d while full coverage %d requested\n",
274 UDP_SKB_CB(skb)->cscov, skb->len);
275 goto drop;
276 }
277 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
278 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
279 "too small, need min %d\n",
280 UDP_SKB_CB(skb)->cscov, up->pcrlen);
281 goto drop;
282 }
283 }
284
285 if (sk->sk_filter) {
286 if (udp_lib_checksum_complete(skb))
287 goto drop;
288 }
289
290 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
291 /* Note that an ENOMEM error is charged twice */
292 if (rc == -ENOMEM)
293 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
294 goto drop;
295 }
296 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
297 return 0;
298 drop:
299 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
300 kfree_skb(skb);
301 return -1;
302 }
303
304 static struct sock *udp_v6_mcast_next(struct sock *sk,
305 __be16 loc_port, struct in6_addr *loc_addr,
306 __be16 rmt_port, struct in6_addr *rmt_addr,
307 int dif)
308 {
309 struct hlist_node *node;
310 struct sock *s = sk;
311 unsigned short num = ntohs(loc_port);
312
313 sk_for_each_from(s, node) {
314 struct inet_sock *inet = inet_sk(s);
315
316 if (s->sk_hash == num && s->sk_family == PF_INET6) {
317 struct ipv6_pinfo *np = inet6_sk(s);
318 if (inet->dport) {
319 if (inet->dport != rmt_port)
320 continue;
321 }
322 if (!ipv6_addr_any(&np->daddr) &&
323 !ipv6_addr_equal(&np->daddr, rmt_addr))
324 continue;
325
326 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
327 continue;
328
329 if (!ipv6_addr_any(&np->rcv_saddr)) {
330 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
331 continue;
332 }
333 if (!inet6_mc_check(s, loc_addr, rmt_addr))
334 continue;
335 return s;
336 }
337 }
338 return NULL;
339 }
340
341 /*
342 * Note: called only from the BH handler context,
343 * so we don't need to lock the hashes.
344 */
345 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
346 struct in6_addr *daddr, struct hlist_head udptable[])
347 {
348 struct sock *sk, *sk2;
349 const struct udphdr *uh = udp_hdr(skb);
350 int dif;
351
352 read_lock(&udp_hash_lock);
353 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
354 dif = inet6_iif(skb);
355 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
356 if (!sk) {
357 kfree_skb(skb);
358 goto out;
359 }
360
361 sk2 = sk;
362 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
363 uh->source, saddr, dif))) {
364 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
365 if (buff)
366 udpv6_queue_rcv_skb(sk2, buff);
367 }
368 udpv6_queue_rcv_skb(sk, skb);
369 out:
370 read_unlock(&udp_hash_lock);
371 return 0;
372 }
373
374 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
375 int proto)
376 {
377 int err;
378
379 UDP_SKB_CB(skb)->partial_cov = 0;
380 UDP_SKB_CB(skb)->cscov = skb->len;
381
382 if (proto == IPPROTO_UDPLITE) {
383 err = udplite_checksum_init(skb, uh);
384 if (err)
385 return err;
386 }
387
388 if (uh->check == 0) {
389 /* RFC 2460 section 8.1 says that we SHOULD log
390 this error. Well, it is reasonable.
391 */
392 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
393 return 1;
394 }
395 if (skb->ip_summed == CHECKSUM_COMPLETE &&
396 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
397 skb->len, proto, skb->csum))
398 skb->ip_summed = CHECKSUM_UNNECESSARY;
399
400 if (!skb_csum_unnecessary(skb))
401 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
402 &ipv6_hdr(skb)->daddr,
403 skb->len, proto, 0));
404
405 return 0;
406 }
407
408 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
409 int proto)
410 {
411 struct sk_buff *skb = *pskb;
412 struct sock *sk;
413 struct udphdr *uh;
414 struct net_device *dev = skb->dev;
415 struct in6_addr *saddr, *daddr;
416 u32 ulen = 0;
417
418 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
419 goto short_packet;
420
421 saddr = &ipv6_hdr(skb)->saddr;
422 daddr = &ipv6_hdr(skb)->daddr;
423 uh = udp_hdr(skb);
424
425 ulen = ntohs(uh->len);
426 if (ulen > skb->len)
427 goto short_packet;
428
429 if (proto == IPPROTO_UDP) {
430 /* UDP validates ulen. */
431
432 /* Check for jumbo payload */
433 if (ulen == 0)
434 ulen = skb->len;
435
436 if (ulen < sizeof(*uh))
437 goto short_packet;
438
439 if (ulen < skb->len) {
440 if (pskb_trim_rcsum(skb, ulen))
441 goto short_packet;
442 saddr = &ipv6_hdr(skb)->saddr;
443 daddr = &ipv6_hdr(skb)->daddr;
444 uh = udp_hdr(skb);
445 }
446 }
447
448 if (udp6_csum_init(skb, uh, proto))
449 goto discard;
450
451 /*
452 * Multicast receive code
453 */
454 if (ipv6_addr_is_multicast(daddr))
455 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
456
457 /* Unicast */
458
459 /*
460 * check socket cache ... must talk to Alan about his plans
461 * for sock caches... i'll skip this for now.
462 */
463 sk = __udp6_lib_lookup(saddr, uh->source,
464 daddr, uh->dest, inet6_iif(skb), udptable);
465
466 if (sk == NULL) {
467 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
468 goto discard;
469
470 if (udp_lib_checksum_complete(skb))
471 goto discard;
472 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
473
474 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
475
476 kfree_skb(skb);
477 return 0;
478 }
479
480 /* deliver */
481
482 udpv6_queue_rcv_skb(sk, skb);
483 sock_put(sk);
484 return 0;
485
486 short_packet:
487 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
488 proto == IPPROTO_UDPLITE ? "-Lite" : "",
489 ulen, skb->len);
490
491 discard:
492 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
493 kfree_skb(skb);
494 return 0;
495 }
496
497 static __inline__ int udpv6_rcv(struct sk_buff **pskb)
498 {
499 return __udp6_lib_rcv(pskb, udp_hash, IPPROTO_UDP);
500 }
501
502 /*
503 * Throw away all pending data and cancel the corking. Socket is locked.
504 */
505 static void udp_v6_flush_pending_frames(struct sock *sk)
506 {
507 struct udp_sock *up = udp_sk(sk);
508
509 if (up->pending) {
510 up->len = 0;
511 up->pending = 0;
512 ip6_flush_pending_frames(sk);
513 }
514 }
515
516 /*
517 * Sending
518 */
519
520 static int udp_v6_push_pending_frames(struct sock *sk)
521 {
522 struct sk_buff *skb;
523 struct udphdr *uh;
524 struct udp_sock *up = udp_sk(sk);
525 struct inet_sock *inet = inet_sk(sk);
526 struct flowi *fl = &inet->cork.fl;
527 int err = 0;
528 __wsum csum = 0;
529
530 /* Grab the skbuff where UDP header space exists. */
531 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
532 goto out;
533
534 /*
535 * Create a UDP header
536 */
537 uh = udp_hdr(skb);
538 uh->source = fl->fl_ip_sport;
539 uh->dest = fl->fl_ip_dport;
540 uh->len = htons(up->len);
541 uh->check = 0;
542
543 if (up->pcflag)
544 csum = udplite_csum_outgoing(sk, skb);
545 else
546 csum = udp_csum_outgoing(sk, skb);
547
548 /* add protocol-dependent pseudo-header */
549 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
550 up->len, fl->proto, csum );
551 if (uh->check == 0)
552 uh->check = CSUM_MANGLED_0;
553
554 err = ip6_push_pending_frames(sk);
555 out:
556 up->len = 0;
557 up->pending = 0;
558 return err;
559 }
560
561 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
562 struct msghdr *msg, size_t len)
563 {
564 struct ipv6_txoptions opt_space;
565 struct udp_sock *up = udp_sk(sk);
566 struct inet_sock *inet = inet_sk(sk);
567 struct ipv6_pinfo *np = inet6_sk(sk);
568 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
569 struct in6_addr *daddr, *final_p = NULL, final;
570 struct ipv6_txoptions *opt = NULL;
571 struct ip6_flowlabel *flowlabel = NULL;
572 struct flowi fl;
573 struct dst_entry *dst;
574 int addr_len = msg->msg_namelen;
575 int ulen = len;
576 int hlimit = -1;
577 int tclass = -1;
578 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
579 int err;
580 int connected = 0;
581 int is_udplite = up->pcflag;
582 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
583
584 /* destination address check */
585 if (sin6) {
586 if (addr_len < offsetof(struct sockaddr, sa_data))
587 return -EINVAL;
588
589 switch (sin6->sin6_family) {
590 case AF_INET6:
591 if (addr_len < SIN6_LEN_RFC2133)
592 return -EINVAL;
593 daddr = &sin6->sin6_addr;
594 break;
595 case AF_INET:
596 goto do_udp_sendmsg;
597 case AF_UNSPEC:
598 msg->msg_name = sin6 = NULL;
599 msg->msg_namelen = addr_len = 0;
600 daddr = NULL;
601 break;
602 default:
603 return -EINVAL;
604 }
605 } else if (!up->pending) {
606 if (sk->sk_state != TCP_ESTABLISHED)
607 return -EDESTADDRREQ;
608 daddr = &np->daddr;
609 } else
610 daddr = NULL;
611
612 if (daddr) {
613 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
614 struct sockaddr_in sin;
615 sin.sin_family = AF_INET;
616 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
617 sin.sin_addr.s_addr = daddr->s6_addr32[3];
618 msg->msg_name = &sin;
619 msg->msg_namelen = sizeof(sin);
620 do_udp_sendmsg:
621 if (__ipv6_only_sock(sk))
622 return -ENETUNREACH;
623 return udp_sendmsg(iocb, sk, msg, len);
624 }
625 }
626
627 if (up->pending == AF_INET)
628 return udp_sendmsg(iocb, sk, msg, len);
629
630 /* Rough check on arithmetic overflow,
631 better check is made in ip6_append_data().
632 */
633 if (len > INT_MAX - sizeof(struct udphdr))
634 return -EMSGSIZE;
635
636 if (up->pending) {
637 /*
638 * There are pending frames.
639 * The socket lock must be held while it's corked.
640 */
641 lock_sock(sk);
642 if (likely(up->pending)) {
643 if (unlikely(up->pending != AF_INET6)) {
644 release_sock(sk);
645 return -EAFNOSUPPORT;
646 }
647 dst = NULL;
648 goto do_append_data;
649 }
650 release_sock(sk);
651 }
652 ulen += sizeof(struct udphdr);
653
654 memset(&fl, 0, sizeof(fl));
655
656 if (sin6) {
657 if (sin6->sin6_port == 0)
658 return -EINVAL;
659
660 fl.fl_ip_dport = sin6->sin6_port;
661 daddr = &sin6->sin6_addr;
662
663 if (np->sndflow) {
664 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
665 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
666 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
667 if (flowlabel == NULL)
668 return -EINVAL;
669 daddr = &flowlabel->dst;
670 }
671 }
672
673 /*
674 * Otherwise it will be difficult to maintain
675 * sk->sk_dst_cache.
676 */
677 if (sk->sk_state == TCP_ESTABLISHED &&
678 ipv6_addr_equal(daddr, &np->daddr))
679 daddr = &np->daddr;
680
681 if (addr_len >= sizeof(struct sockaddr_in6) &&
682 sin6->sin6_scope_id &&
683 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
684 fl.oif = sin6->sin6_scope_id;
685 } else {
686 if (sk->sk_state != TCP_ESTABLISHED)
687 return -EDESTADDRREQ;
688
689 fl.fl_ip_dport = inet->dport;
690 daddr = &np->daddr;
691 fl.fl6_flowlabel = np->flow_label;
692 connected = 1;
693 }
694
695 if (!fl.oif)
696 fl.oif = sk->sk_bound_dev_if;
697
698 if (msg->msg_controllen) {
699 opt = &opt_space;
700 memset(opt, 0, sizeof(struct ipv6_txoptions));
701 opt->tot_len = sizeof(*opt);
702
703 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
704 if (err < 0) {
705 fl6_sock_release(flowlabel);
706 return err;
707 }
708 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
709 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
710 if (flowlabel == NULL)
711 return -EINVAL;
712 }
713 if (!(opt->opt_nflen|opt->opt_flen))
714 opt = NULL;
715 connected = 0;
716 }
717 if (opt == NULL)
718 opt = np->opt;
719 if (flowlabel)
720 opt = fl6_merge_options(&opt_space, flowlabel, opt);
721 opt = ipv6_fixup_options(&opt_space, opt);
722
723 fl.proto = sk->sk_protocol;
724 ipv6_addr_copy(&fl.fl6_dst, daddr);
725 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
726 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
727 fl.fl_ip_sport = inet->sport;
728
729 /* merge ip6_build_xmit from ip6_output */
730 if (opt && opt->srcrt) {
731 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
732 ipv6_addr_copy(&final, &fl.fl6_dst);
733 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
734 final_p = &final;
735 connected = 0;
736 }
737
738 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
739 fl.oif = np->mcast_oif;
740 connected = 0;
741 }
742
743 security_sk_classify_flow(sk, &fl);
744
745 err = ip6_sk_dst_lookup(sk, &dst, &fl);
746 if (err)
747 goto out;
748 if (final_p)
749 ipv6_addr_copy(&fl.fl6_dst, final_p);
750
751 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
752 goto out;
753
754 if (hlimit < 0) {
755 if (ipv6_addr_is_multicast(&fl.fl6_dst))
756 hlimit = np->mcast_hops;
757 else
758 hlimit = np->hop_limit;
759 if (hlimit < 0)
760 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
761 if (hlimit < 0)
762 hlimit = ipv6_get_hoplimit(dst->dev);
763 }
764
765 if (tclass < 0) {
766 tclass = np->tclass;
767 if (tclass < 0)
768 tclass = 0;
769 }
770
771 if (msg->msg_flags&MSG_CONFIRM)
772 goto do_confirm;
773 back_from_confirm:
774
775 lock_sock(sk);
776 if (unlikely(up->pending)) {
777 /* The socket is already corked while preparing it. */
778 /* ... which is an evident application bug. --ANK */
779 release_sock(sk);
780
781 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
782 err = -EINVAL;
783 goto out;
784 }
785
786 up->pending = AF_INET6;
787
788 do_append_data:
789 up->len += ulen;
790 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
791 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
792 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
793 (struct rt6_info*)dst,
794 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
795 if (err)
796 udp_v6_flush_pending_frames(sk);
797 else if (!corkreq)
798 err = udp_v6_push_pending_frames(sk);
799 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
800 up->pending = 0;
801
802 if (dst) {
803 if (connected) {
804 ip6_dst_store(sk, dst,
805 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
806 &np->daddr : NULL,
807 #ifdef CONFIG_IPV6_SUBTREES
808 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
809 &np->saddr :
810 #endif
811 NULL);
812 } else {
813 dst_release(dst);
814 }
815 }
816
817 if (err > 0)
818 err = np->recverr ? net_xmit_errno(err) : 0;
819 release_sock(sk);
820 out:
821 fl6_sock_release(flowlabel);
822 if (!err) {
823 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
824 return len;
825 }
826 /*
827 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
828 * ENOBUFS might not be good (it's not tunable per se), but otherwise
829 * we don't have a good statistic (IpOutDiscards but it can be too many
830 * things). We could add another new stat but at least for now that
831 * seems like overkill.
832 */
833 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
834 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
835 }
836 return err;
837
838 do_confirm:
839 dst_confirm(dst);
840 if (!(msg->msg_flags&MSG_PROBE) || len)
841 goto back_from_confirm;
842 err = 0;
843 goto out;
844 }
845
846 int udpv6_destroy_sock(struct sock *sk)
847 {
848 lock_sock(sk);
849 udp_v6_flush_pending_frames(sk);
850 release_sock(sk);
851
852 inet6_destroy_sock(sk);
853
854 return 0;
855 }
856
857 /*
858 * Socket option code for UDP
859 */
860 int udpv6_setsockopt(struct sock *sk, int level, int optname,
861 char __user *optval, int optlen)
862 {
863 if (level == SOL_UDP || level == SOL_UDPLITE)
864 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
865 udp_v6_push_pending_frames);
866 return ipv6_setsockopt(sk, level, optname, optval, optlen);
867 }
868
869 #ifdef CONFIG_COMPAT
870 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
871 char __user *optval, int optlen)
872 {
873 if (level == SOL_UDP || level == SOL_UDPLITE)
874 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
875 udp_v6_push_pending_frames);
876 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
877 }
878 #endif
879
880 int udpv6_getsockopt(struct sock *sk, int level, int optname,
881 char __user *optval, int __user *optlen)
882 {
883 if (level == SOL_UDP || level == SOL_UDPLITE)
884 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
885 return ipv6_getsockopt(sk, level, optname, optval, optlen);
886 }
887
888 #ifdef CONFIG_COMPAT
889 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
890 char __user *optval, int __user *optlen)
891 {
892 if (level == SOL_UDP || level == SOL_UDPLITE)
893 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
894 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
895 }
896 #endif
897
898 static struct inet6_protocol udpv6_protocol = {
899 .handler = udpv6_rcv,
900 .err_handler = udpv6_err,
901 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
902 };
903
904 /* ------------------------------------------------------------------------ */
905 #ifdef CONFIG_PROC_FS
906
907 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
908 {
909 struct inet_sock *inet = inet_sk(sp);
910 struct ipv6_pinfo *np = inet6_sk(sp);
911 struct in6_addr *dest, *src;
912 __u16 destp, srcp;
913
914 dest = &np->daddr;
915 src = &np->rcv_saddr;
916 destp = ntohs(inet->dport);
917 srcp = ntohs(inet->sport);
918 seq_printf(seq,
919 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
920 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
921 bucket,
922 src->s6_addr32[0], src->s6_addr32[1],
923 src->s6_addr32[2], src->s6_addr32[3], srcp,
924 dest->s6_addr32[0], dest->s6_addr32[1],
925 dest->s6_addr32[2], dest->s6_addr32[3], destp,
926 sp->sk_state,
927 atomic_read(&sp->sk_wmem_alloc),
928 atomic_read(&sp->sk_rmem_alloc),
929 0, 0L, 0,
930 sock_i_uid(sp), 0,
931 sock_i_ino(sp),
932 atomic_read(&sp->sk_refcnt), sp);
933 }
934
935 int udp6_seq_show(struct seq_file *seq, void *v)
936 {
937 if (v == SEQ_START_TOKEN)
938 seq_printf(seq,
939 " sl "
940 "local_address "
941 "remote_address "
942 "st tx_queue rx_queue tr tm->when retrnsmt"
943 " uid timeout inode\n");
944 else
945 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
946 return 0;
947 }
948
949 static struct file_operations udp6_seq_fops;
950 static struct udp_seq_afinfo udp6_seq_afinfo = {
951 .owner = THIS_MODULE,
952 .name = "udp6",
953 .family = AF_INET6,
954 .hashtable = udp_hash,
955 .seq_show = udp6_seq_show,
956 .seq_fops = &udp6_seq_fops,
957 };
958
959 int __init udp6_proc_init(void)
960 {
961 return udp_proc_register(&udp6_seq_afinfo);
962 }
963
964 void udp6_proc_exit(void) {
965 udp_proc_unregister(&udp6_seq_afinfo);
966 }
967 #endif /* CONFIG_PROC_FS */
968
969 /* ------------------------------------------------------------------------ */
970
971 struct proto udpv6_prot = {
972 .name = "UDPv6",
973 .owner = THIS_MODULE,
974 .close = udp_lib_close,
975 .connect = ip6_datagram_connect,
976 .disconnect = udp_disconnect,
977 .ioctl = udp_ioctl,
978 .destroy = udpv6_destroy_sock,
979 .setsockopt = udpv6_setsockopt,
980 .getsockopt = udpv6_getsockopt,
981 .sendmsg = udpv6_sendmsg,
982 .recvmsg = udpv6_recvmsg,
983 .backlog_rcv = udpv6_queue_rcv_skb,
984 .hash = udp_lib_hash,
985 .unhash = udp_lib_unhash,
986 .get_port = udp_v6_get_port,
987 .obj_size = sizeof(struct udp6_sock),
988 #ifdef CONFIG_COMPAT
989 .compat_setsockopt = compat_udpv6_setsockopt,
990 .compat_getsockopt = compat_udpv6_getsockopt,
991 #endif
992 };
993
994 static struct inet_protosw udpv6_protosw = {
995 .type = SOCK_DGRAM,
996 .protocol = IPPROTO_UDP,
997 .prot = &udpv6_prot,
998 .ops = &inet6_dgram_ops,
999 .capability =-1,
1000 .no_check = UDP_CSUM_DEFAULT,
1001 .flags = INET_PROTOSW_PERMANENT,
1002 };
1003
1004
1005 void __init udpv6_init(void)
1006 {
1007 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1008 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1009 inet6_register_protosw(&udpv6_protosw);
1010 }
Linux kernel - Deliverables
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