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[NET]: annotate csum_ipv6_magic() callers in net/*
[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/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/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
45 #include <net/raw.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
48 #include <net/xfrm.h>
49
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include "udp_impl.h"
53
54 DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
55
56 static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
57 {
58 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
59 }
60
61 static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
62 struct in6_addr *daddr, __be16 dport,
63 int dif, struct hlist_head udptable[])
64 {
65 struct sock *sk, *result = NULL;
66 struct hlist_node *node;
67 unsigned short hnum = ntohs(dport);
68 int badness = -1;
69
70 read_lock(&udp_hash_lock);
71 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
72 struct inet_sock *inet = inet_sk(sk);
73
74 if (inet->num == hnum && sk->sk_family == PF_INET6) {
75 struct ipv6_pinfo *np = inet6_sk(sk);
76 int score = 0;
77 if (inet->dport) {
78 if (inet->dport != sport)
79 continue;
80 score++;
81 }
82 if (!ipv6_addr_any(&np->rcv_saddr)) {
83 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
84 continue;
85 score++;
86 }
87 if (!ipv6_addr_any(&np->daddr)) {
88 if (!ipv6_addr_equal(&np->daddr, saddr))
89 continue;
90 score++;
91 }
92 if (sk->sk_bound_dev_if) {
93 if (sk->sk_bound_dev_if != dif)
94 continue;
95 score++;
96 }
97 if(score == 4) {
98 result = sk;
99 break;
100 } else if(score > badness) {
101 result = sk;
102 badness = score;
103 }
104 }
105 }
106 if (result)
107 sock_hold(result);
108 read_unlock(&udp_hash_lock);
109 return result;
110 }
111
112 /*
113 * This should be easy, if there is something there we
114 * return it, otherwise we block.
115 */
116
117 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
118 struct msghdr *msg, size_t len,
119 int noblock, int flags, int *addr_len)
120 {
121 struct ipv6_pinfo *np = inet6_sk(sk);
122 struct inet_sock *inet = inet_sk(sk);
123 struct sk_buff *skb;
124 size_t copied;
125 int err, copy_only, 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 copied = skb->len - sizeof(struct udphdr);
139 if (copied > len) {
140 copied = len;
141 msg->msg_flags |= MSG_TRUNC;
142 }
143
144 /*
145 * Decide whether to checksum and/or copy data.
146 */
147 copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY);
148
149 if (is_udplite || (!copy_only && msg->msg_flags&MSG_TRUNC)) {
150 if (__udp_lib_checksum_complete(skb))
151 goto csum_copy_err;
152 copy_only = 1;
153 }
154
155 if (copy_only)
156 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
157 msg->msg_iov, copied );
158 else {
159 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
160 if (err == -EINVAL)
161 goto csum_copy_err;
162 }
163 if (err)
164 goto out_free;
165
166 sock_recv_timestamp(msg, sk, skb);
167
168 /* Copy the address. */
169 if (msg->msg_name) {
170 struct sockaddr_in6 *sin6;
171
172 sin6 = (struct sockaddr_in6 *) msg->msg_name;
173 sin6->sin6_family = AF_INET6;
174 sin6->sin6_port = skb->h.uh->source;
175 sin6->sin6_flowinfo = 0;
176 sin6->sin6_scope_id = 0;
177
178 if (skb->protocol == htons(ETH_P_IP))
179 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
180 htonl(0xffff), skb->nh.iph->saddr);
181 else {
182 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
183 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
184 sin6->sin6_scope_id = IP6CB(skb)->iif;
185 }
186
187 }
188 if (skb->protocol == htons(ETH_P_IP)) {
189 if (inet->cmsg_flags)
190 ip_cmsg_recv(msg, skb);
191 } else {
192 if (np->rxopt.all)
193 datagram_recv_ctl(sk, msg, skb);
194 }
195
196 err = copied;
197 if (flags & MSG_TRUNC)
198 err = skb->len - sizeof(struct udphdr);
199
200 out_free:
201 skb_free_datagram(sk, skb);
202 out:
203 return err;
204
205 csum_copy_err:
206 skb_kill_datagram(sk, skb, flags);
207
208 if (flags & MSG_DONTWAIT) {
209 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
210 return -EAGAIN;
211 }
212 goto try_again;
213 }
214
215 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
216 int type, int code, int offset, __be32 info,
217 struct hlist_head udptable[] )
218 {
219 struct ipv6_pinfo *np;
220 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
221 struct in6_addr *saddr = &hdr->saddr;
222 struct in6_addr *daddr = &hdr->daddr;
223 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
224 struct sock *sk;
225 int err;
226
227 sk = __udp6_lib_lookup(daddr, uh->dest,
228 saddr, uh->source, inet6_iif(skb), udptable);
229 if (sk == NULL)
230 return;
231
232 np = inet6_sk(sk);
233
234 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
235 goto out;
236
237 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
238 goto out;
239
240 if (np->recverr)
241 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
242
243 sk->sk_err = err;
244 sk->sk_error_report(sk);
245 out:
246 sock_put(sk);
247 }
248
249 static __inline__ void udpv6_err(struct sk_buff *skb,
250 struct inet6_skb_parm *opt, int type,
251 int code, int offset, __u32 info )
252 {
253 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
254 }
255
256 int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
257 {
258 struct udp_sock *up = udp_sk(sk);
259 int rc;
260
261 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
262 goto drop;
263
264 /*
265 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
266 */
267 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
268
269 if (up->pcrlen == 0) { /* full coverage was set */
270 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
271 " %d while full coverage %d requested\n",
272 UDP_SKB_CB(skb)->cscov, skb->len);
273 goto drop;
274 }
275 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
276 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
277 "too small, need min %d\n",
278 UDP_SKB_CB(skb)->cscov, up->pcrlen);
279 goto drop;
280 }
281 }
282
283 if (udp_lib_checksum_complete(skb))
284 goto drop;
285
286 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
287 /* Note that an ENOMEM error is charged twice */
288 if (rc == -ENOMEM)
289 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
290 goto drop;
291 }
292 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
293 return 0;
294 drop:
295 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
296 kfree_skb(skb);
297 return -1;
298 }
299
300 static struct sock *udp_v6_mcast_next(struct sock *sk,
301 __be16 loc_port, struct in6_addr *loc_addr,
302 __be16 rmt_port, struct in6_addr *rmt_addr,
303 int dif)
304 {
305 struct hlist_node *node;
306 struct sock *s = sk;
307 unsigned short num = ntohs(loc_port);
308
309 sk_for_each_from(s, node) {
310 struct inet_sock *inet = inet_sk(s);
311
312 if (inet->num == num && s->sk_family == PF_INET6) {
313 struct ipv6_pinfo *np = inet6_sk(s);
314 if (inet->dport) {
315 if (inet->dport != rmt_port)
316 continue;
317 }
318 if (!ipv6_addr_any(&np->daddr) &&
319 !ipv6_addr_equal(&np->daddr, rmt_addr))
320 continue;
321
322 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
323 continue;
324
325 if (!ipv6_addr_any(&np->rcv_saddr)) {
326 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
327 continue;
328 }
329 if(!inet6_mc_check(s, loc_addr, rmt_addr))
330 continue;
331 return s;
332 }
333 }
334 return NULL;
335 }
336
337 /*
338 * Note: called only from the BH handler context,
339 * so we don't need to lock the hashes.
340 */
341 static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
342 struct in6_addr *daddr, struct hlist_head udptable[])
343 {
344 struct sock *sk, *sk2;
345 const struct udphdr *uh = skb->h.uh;
346 int dif;
347
348 read_lock(&udp_hash_lock);
349 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
350 dif = inet6_iif(skb);
351 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
352 if (!sk) {
353 kfree_skb(skb);
354 goto out;
355 }
356
357 sk2 = sk;
358 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
359 uh->source, saddr, dif))) {
360 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
361 if (buff)
362 udpv6_queue_rcv_skb(sk2, buff);
363 }
364 udpv6_queue_rcv_skb(sk, skb);
365 out:
366 read_unlock(&udp_hash_lock);
367 return 0;
368 }
369
370 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh)
371
372 {
373 if (uh->check == 0) {
374 /* RFC 2460 section 8.1 says that we SHOULD log
375 this error. Well, it is reasonable.
376 */
377 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
378 return 1;
379 }
380 if (skb->ip_summed == CHECKSUM_COMPLETE &&
381 !csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
382 skb->len, IPPROTO_UDP, skb->csum ))
383 skb->ip_summed = CHECKSUM_UNNECESSARY;
384
385 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
386 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
387 &skb->nh.ipv6h->daddr,
388 ulen, IPPROTO_UDP,
389 0));
390
391 return (UDP_SKB_CB(skb)->partial_cov = 0);
392 }
393
394 int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
395 int is_udplite)
396 {
397 struct sk_buff *skb = *pskb;
398 struct sock *sk;
399 struct udphdr *uh;
400 struct net_device *dev = skb->dev;
401 struct in6_addr *saddr, *daddr;
402 u32 ulen = 0;
403
404 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
405 goto short_packet;
406
407 saddr = &skb->nh.ipv6h->saddr;
408 daddr = &skb->nh.ipv6h->daddr;
409 uh = skb->h.uh;
410
411 ulen = ntohs(uh->len);
412 if (ulen > skb->len)
413 goto short_packet;
414
415 if(! is_udplite ) { /* UDP validates ulen. */
416
417 /* Check for jumbo payload */
418 if (ulen == 0)
419 ulen = skb->len;
420
421 if (ulen < sizeof(*uh))
422 goto short_packet;
423
424 if (ulen < skb->len) {
425 if (pskb_trim_rcsum(skb, ulen))
426 goto short_packet;
427 saddr = &skb->nh.ipv6h->saddr;
428 daddr = &skb->nh.ipv6h->daddr;
429 uh = skb->h.uh;
430 }
431
432 if (udp6_csum_init(skb, uh))
433 goto discard;
434
435 } else { /* UDP-Lite validates cscov. */
436 if (udplite6_csum_init(skb, uh))
437 goto discard;
438 }
439
440 /*
441 * Multicast receive code
442 */
443 if (ipv6_addr_is_multicast(daddr))
444 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
445
446 /* Unicast */
447
448 /*
449 * check socket cache ... must talk to Alan about his plans
450 * for sock caches... i'll skip this for now.
451 */
452 sk = __udp6_lib_lookup(saddr, uh->source,
453 daddr, uh->dest, inet6_iif(skb), udptable);
454
455 if (sk == NULL) {
456 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
457 goto discard;
458
459 if (udp_lib_checksum_complete(skb))
460 goto discard;
461 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
462
463 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
464
465 kfree_skb(skb);
466 return(0);
467 }
468
469 /* deliver */
470
471 udpv6_queue_rcv_skb(sk, skb);
472 sock_put(sk);
473 return(0);
474
475 short_packet:
476 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
477 is_udplite? "-Lite" : "", ulen, skb->len);
478
479 discard:
480 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
481 kfree_skb(skb);
482 return(0);
483 }
484
485 static __inline__ int udpv6_rcv(struct sk_buff **pskb)
486 {
487 return __udp6_lib_rcv(pskb, udp_hash, 0);
488 }
489
490 /*
491 * Throw away all pending data and cancel the corking. Socket is locked.
492 */
493 static void udp_v6_flush_pending_frames(struct sock *sk)
494 {
495 struct udp_sock *up = udp_sk(sk);
496
497 if (up->pending) {
498 up->len = 0;
499 up->pending = 0;
500 ip6_flush_pending_frames(sk);
501 }
502 }
503
504 /*
505 * Sending
506 */
507
508 static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
509 {
510 struct sk_buff *skb;
511 struct udphdr *uh;
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 = -1;
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, 0)) < 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, up);
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 static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
848 char __user *optval, int optlen)
849 {
850 struct udp_sock *up = udp_sk(sk);
851 int val;
852 int err = 0;
853
854 if(optlen<sizeof(int))
855 return -EINVAL;
856
857 if (get_user(val, (int __user *)optval))
858 return -EFAULT;
859
860 switch(optname) {
861 case UDP_CORK:
862 if (val != 0) {
863 up->corkflag = 1;
864 } else {
865 up->corkflag = 0;
866 lock_sock(sk);
867 udp_v6_push_pending_frames(sk, up);
868 release_sock(sk);
869 }
870 break;
871 case UDP_ENCAP:
872 switch (val) {
873 case 0:
874 up->encap_type = val;
875 break;
876 default:
877 err = -ENOPROTOOPT;
878 break;
879 }
880 break;
881
882 case UDPLITE_SEND_CSCOV:
883 if (!up->pcflag) /* Disable the option on UDP sockets */
884 return -ENOPROTOOPT;
885 if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
886 val = 8;
887 up->pcslen = val;
888 up->pcflag |= UDPLITE_SEND_CC;
889 break;
890
891 case UDPLITE_RECV_CSCOV:
892 if (!up->pcflag) /* Disable the option on UDP sockets */
893 return -ENOPROTOOPT;
894 if (val != 0 && val < 8) /* Avoid silly minimal values. */
895 val = 8;
896 up->pcrlen = val;
897 up->pcflag |= UDPLITE_RECV_CC;
898 break;
899
900 default:
901 err = -ENOPROTOOPT;
902 break;
903 };
904
905 return err;
906 }
907
908 int udpv6_setsockopt(struct sock *sk, int level, int optname,
909 char __user *optval, int optlen)
910 {
911 if (level == SOL_UDP || level == SOL_UDPLITE)
912 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
913 return ipv6_setsockopt(sk, level, optname, optval, optlen);
914 }
915
916 #ifdef CONFIG_COMPAT
917 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
918 char __user *optval, int optlen)
919 {
920 if (level == SOL_UDP || level == SOL_UDPLITE)
921 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
922 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
923 }
924 #endif
925
926 static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
927 char __user *optval, int __user *optlen)
928 {
929 struct udp_sock *up = udp_sk(sk);
930 int val, len;
931
932 if(get_user(len,optlen))
933 return -EFAULT;
934
935 len = min_t(unsigned int, len, sizeof(int));
936
937 if(len < 0)
938 return -EINVAL;
939
940 switch(optname) {
941 case UDP_CORK:
942 val = up->corkflag;
943 break;
944
945 case UDP_ENCAP:
946 val = up->encap_type;
947 break;
948
949 case UDPLITE_SEND_CSCOV:
950 val = up->pcslen;
951 break;
952
953 case UDPLITE_RECV_CSCOV:
954 val = up->pcrlen;
955 break;
956
957 default:
958 return -ENOPROTOOPT;
959 };
960
961 if(put_user(len, optlen))
962 return -EFAULT;
963 if(copy_to_user(optval, &val,len))
964 return -EFAULT;
965 return 0;
966 }
967
968 int udpv6_getsockopt(struct sock *sk, int level, int optname,
969 char __user *optval, int __user *optlen)
970 {
971 if (level == SOL_UDP || level == SOL_UDPLITE)
972 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
973 return ipv6_getsockopt(sk, level, optname, optval, optlen);
974 }
975
976 #ifdef CONFIG_COMPAT
977 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
978 char __user *optval, int __user *optlen)
979 {
980 if (level == SOL_UDP || level == SOL_UDPLITE)
981 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
982 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
983 }
984 #endif
985
986 static struct inet6_protocol udpv6_protocol = {
987 .handler = udpv6_rcv,
988 .err_handler = udpv6_err,
989 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
990 };
991
992 /* ------------------------------------------------------------------------ */
993 #ifdef CONFIG_PROC_FS
994
995 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
996 {
997 struct inet_sock *inet = inet_sk(sp);
998 struct ipv6_pinfo *np = inet6_sk(sp);
999 struct in6_addr *dest, *src;
1000 __u16 destp, srcp;
1001
1002 dest = &np->daddr;
1003 src = &np->rcv_saddr;
1004 destp = ntohs(inet->dport);
1005 srcp = ntohs(inet->sport);
1006 seq_printf(seq,
1007 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1008 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1009 bucket,
1010 src->s6_addr32[0], src->s6_addr32[1],
1011 src->s6_addr32[2], src->s6_addr32[3], srcp,
1012 dest->s6_addr32[0], dest->s6_addr32[1],
1013 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1014 sp->sk_state,
1015 atomic_read(&sp->sk_wmem_alloc),
1016 atomic_read(&sp->sk_rmem_alloc),
1017 0, 0L, 0,
1018 sock_i_uid(sp), 0,
1019 sock_i_ino(sp),
1020 atomic_read(&sp->sk_refcnt), sp);
1021 }
1022
1023 int udp6_seq_show(struct seq_file *seq, void *v)
1024 {
1025 if (v == SEQ_START_TOKEN)
1026 seq_printf(seq,
1027 " sl "
1028 "local_address "
1029 "remote_address "
1030 "st tx_queue rx_queue tr tm->when retrnsmt"
1031 " uid timeout inode\n");
1032 else
1033 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1034 return 0;
1035 }
1036
1037 static struct file_operations udp6_seq_fops;
1038 static struct udp_seq_afinfo udp6_seq_afinfo = {
1039 .owner = THIS_MODULE,
1040 .name = "udp6",
1041 .family = AF_INET6,
1042 .hashtable = udp_hash,
1043 .seq_show = udp6_seq_show,
1044 .seq_fops = &udp6_seq_fops,
1045 };
1046
1047 int __init udp6_proc_init(void)
1048 {
1049 return udp_proc_register(&udp6_seq_afinfo);
1050 }
1051
1052 void udp6_proc_exit(void) {
1053 udp_proc_unregister(&udp6_seq_afinfo);
1054 }
1055 #endif /* CONFIG_PROC_FS */
1056
1057 /* ------------------------------------------------------------------------ */
1058
1059 struct proto udpv6_prot = {
1060 .name = "UDPv6",
1061 .owner = THIS_MODULE,
1062 .close = udp_lib_close,
1063 .connect = ip6_datagram_connect,
1064 .disconnect = udp_disconnect,
1065 .ioctl = udp_ioctl,
1066 .destroy = udpv6_destroy_sock,
1067 .setsockopt = udpv6_setsockopt,
1068 .getsockopt = udpv6_getsockopt,
1069 .sendmsg = udpv6_sendmsg,
1070 .recvmsg = udpv6_recvmsg,
1071 .backlog_rcv = udpv6_queue_rcv_skb,
1072 .hash = udp_lib_hash,
1073 .unhash = udp_lib_unhash,
1074 .get_port = udp_v6_get_port,
1075 .obj_size = sizeof(struct udp6_sock),
1076 #ifdef CONFIG_COMPAT
1077 .compat_setsockopt = compat_udpv6_setsockopt,
1078 .compat_getsockopt = compat_udpv6_getsockopt,
1079 #endif
1080 };
1081
1082 static struct inet_protosw udpv6_protosw = {
1083 .type = SOCK_DGRAM,
1084 .protocol = IPPROTO_UDP,
1085 .prot = &udpv6_prot,
1086 .ops = &inet6_dgram_ops,
1087 .capability =-1,
1088 .no_check = UDP_CSUM_DEFAULT,
1089 .flags = INET_PROTOSW_PERMANENT,
1090 };
1091
1092
1093 void __init udpv6_init(void)
1094 {
1095 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1096 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1097 inet6_register_protosw(&udpv6_protosw);
1098 }
Linux kernel - Deliverables
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