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-rw-r--r--net/ipv6/udp.c1065
1 files changed, 1065 insertions, 0 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
new file mode 100644
index 000000000000..53739de829db
--- /dev/null
+++ b/net/ipv6/udp.c
@@ -0,0 +1,1065 @@
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/module.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
54static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
55{
56 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
57}
58
59static struct sock *__udp6_lib_lookup(struct net *net,
60 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_net == net && sk->sk_hash == hnum &&
74 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
117int 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 unsigned int ulen, copied;
125 int peeked;
126 int err;
127 int is_udplite = IS_UDPLITE(sk);
128
129 if (addr_len)
130 *addr_len=sizeof(struct sockaddr_in6);
131
132 if (flags & MSG_ERRQUEUE)
133 return ipv6_recv_error(sk, msg, len);
134
135try_again:
136 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
137 &peeked, &err);
138 if (!skb)
139 goto out;
140
141 ulen = skb->len - sizeof(struct udphdr);
142 copied = len;
143 if (copied > ulen)
144 copied = ulen;
145 else if (copied < ulen)
146 msg->msg_flags |= MSG_TRUNC;
147
148 /*
149 * If checksum is needed at all, try to do it while copying the
150 * data. If the data is truncated, or if we only want a partial
151 * coverage checksum (UDP-Lite), do it before the copy.
152 */
153
154 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
155 if (udp_lib_checksum_complete(skb))
156 goto csum_copy_err;
157 }
158
159 if (skb_csum_unnecessary(skb))
160 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
161 msg->msg_iov, copied );
162 else {
163 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
164 if (err == -EINVAL)
165 goto csum_copy_err;
166 }
167 if (err)
168 goto out_free;
169
170 if (!peeked)
171 UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
172
173 sock_recv_timestamp(msg, sk, skb);
174
175 /* Copy the address. */
176 if (msg->msg_name) {
177 struct sockaddr_in6 *sin6;
178
179 sin6 = (struct sockaddr_in6 *) msg->msg_name;
180 sin6->sin6_family = AF_INET6;
181 sin6->sin6_port = udp_hdr(skb)->source;
182 sin6->sin6_flowinfo = 0;
183 sin6->sin6_scope_id = 0;
184
185 if (skb->protocol == htons(ETH_P_IP))
186 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
187 htonl(0xffff), ip_hdr(skb)->saddr);
188 else {
189 ipv6_addr_copy(&sin6->sin6_addr,
190 &ipv6_hdr(skb)->saddr);
191 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
192 sin6->sin6_scope_id = IP6CB(skb)->iif;
193 }
194
195 }
196 if (skb->protocol == htons(ETH_P_IP)) {
197 if (inet->cmsg_flags)
198 ip_cmsg_recv(msg, skb);
199 } else {
200 if (np->rxopt.all)
201 datagram_recv_ctl(sk, msg, skb);
202 }
203
204 err = copied;
205 if (flags & MSG_TRUNC)
206 err = ulen;
207
208out_free:
209 lock_sock(sk);
210 skb_free_datagram(sk, skb);
211 release_sock(sk);
212out:
213 return err;
214
215csum_copy_err:
216 lock_sock(sk);
217 if (!skb_kill_datagram(sk, skb, flags))
218 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
219 release_sock(sk);
220
221 if (flags & MSG_DONTWAIT)
222 return -EAGAIN;
223 goto try_again;
224}
225
226void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
227 int type, int code, int offset, __be32 info,
228 struct hlist_head udptable[] )
229{
230 struct ipv6_pinfo *np;
231 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
232 struct in6_addr *saddr = &hdr->saddr;
233 struct in6_addr *daddr = &hdr->daddr;
234 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
235 struct sock *sk;
236 int err;
237
238 sk = __udp6_lib_lookup(skb->dev->nd_net, daddr, uh->dest,
239 saddr, uh->source, inet6_iif(skb), udptable);
240 if (sk == NULL)
241 return;
242
243 np = inet6_sk(sk);
244
245 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
246 goto out;
247
248 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
249 goto out;
250
251 if (np->recverr)
252 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
253
254 sk->sk_err = err;
255 sk->sk_error_report(sk);
256out:
257 sock_put(sk);
258}
259
260static __inline__ void udpv6_err(struct sk_buff *skb,
261 struct inet6_skb_parm *opt, int type,
262 int code, int offset, __be32 info )
263{
264 __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
265}
266
267int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
268{
269 struct udp_sock *up = udp_sk(sk);
270 int rc;
271 int is_udplite = IS_UDPLITE(sk);
272
273 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
274 goto drop;
275
276 /*
277 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
278 */
279 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
280
281 if (up->pcrlen == 0) { /* full coverage was set */
282 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
283 " %d while full coverage %d requested\n",
284 UDP_SKB_CB(skb)->cscov, skb->len);
285 goto drop;
286 }
287 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
288 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
289 "too small, need min %d\n",
290 UDP_SKB_CB(skb)->cscov, up->pcrlen);
291 goto drop;
292 }
293 }
294
295 if (sk->sk_filter) {
296 if (udp_lib_checksum_complete(skb))
297 goto drop;
298 }
299
300 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
301 /* Note that an ENOMEM error is charged twice */
302 if (rc == -ENOMEM)
303 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
304 goto drop;
305 }
306
307 return 0;
308drop:
309 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
310 kfree_skb(skb);
311 return -1;
312}
313
314static struct sock *udp_v6_mcast_next(struct sock *sk,
315 __be16 loc_port, struct in6_addr *loc_addr,
316 __be16 rmt_port, struct in6_addr *rmt_addr,
317 int dif)
318{
319 struct hlist_node *node;
320 struct sock *s = sk;
321 unsigned short num = ntohs(loc_port);
322
323 sk_for_each_from(s, node) {
324 struct inet_sock *inet = inet_sk(s);
325
326 if (s->sk_hash == num && s->sk_family == PF_INET6) {
327 struct ipv6_pinfo *np = inet6_sk(s);
328 if (inet->dport) {
329 if (inet->dport != rmt_port)
330 continue;
331 }
332 if (!ipv6_addr_any(&np->daddr) &&
333 !ipv6_addr_equal(&np->daddr, rmt_addr))
334 continue;
335
336 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
337 continue;
338
339 if (!ipv6_addr_any(&np->rcv_saddr)) {
340 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
341 continue;
342 }
343 if (!inet6_mc_check(s, loc_addr, rmt_addr))
344 continue;
345 return s;
346 }
347 }
348 return NULL;
349}
350
351/*
352 * Note: called only from the BH handler context,
353 * so we don't need to lock the hashes.
354 */
355static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
356 struct in6_addr *daddr, struct hlist_head udptable[])
357{
358 struct sock *sk, *sk2;
359 const struct udphdr *uh = udp_hdr(skb);
360 int dif;
361
362 read_lock(&udp_hash_lock);
363 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
364 dif = inet6_iif(skb);
365 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
366 if (!sk) {
367 kfree_skb(skb);
368 goto out;
369 }
370
371 sk2 = sk;
372 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
373 uh->source, saddr, dif))) {
374 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
375 if (buff) {
376 bh_lock_sock_nested(sk2);
377 if (!sock_owned_by_user(sk2))
378 udpv6_queue_rcv_skb(sk2, buff);
379 else
380 sk_add_backlog(sk2, buff);
381 bh_unlock_sock(sk2);
382 }
383 }
384 bh_lock_sock_nested(sk);
385 if (!sock_owned_by_user(sk))
386 udpv6_queue_rcv_skb(sk, skb);
387 else
388 sk_add_backlog(sk, skb);
389 bh_unlock_sock(sk);
390out:
391 read_unlock(&udp_hash_lock);
392 return 0;
393}
394
395static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
396 int proto)
397{
398 int err;
399
400 UDP_SKB_CB(skb)->partial_cov = 0;
401 UDP_SKB_CB(skb)->cscov = skb->len;
402
403 if (proto == IPPROTO_UDPLITE) {
404 err = udplite_checksum_init(skb, uh);
405 if (err)
406 return err;
407 }
408
409 if (uh->check == 0) {
410 /* RFC 2460 section 8.1 says that we SHOULD log
411 this error. Well, it is reasonable.
412 */
413 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
414 return 1;
415 }
416 if (skb->ip_summed == CHECKSUM_COMPLETE &&
417 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
418 skb->len, proto, skb->csum))
419 skb->ip_summed = CHECKSUM_UNNECESSARY;
420
421 if (!skb_csum_unnecessary(skb))
422 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
423 &ipv6_hdr(skb)->daddr,
424 skb->len, proto, 0));
425
426 return 0;
427}
428
429int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
430 int proto)
431{
432 struct sock *sk;
433 struct udphdr *uh;
434 struct net_device *dev = skb->dev;
435 struct in6_addr *saddr, *daddr;
436 u32 ulen = 0;
437
438 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
439 goto short_packet;
440
441 saddr = &ipv6_hdr(skb)->saddr;
442 daddr = &ipv6_hdr(skb)->daddr;
443 uh = udp_hdr(skb);
444
445 ulen = ntohs(uh->len);
446 if (ulen > skb->len)
447 goto short_packet;
448
449 if (proto == IPPROTO_UDP) {
450 /* UDP validates ulen. */
451
452 /* Check for jumbo payload */
453 if (ulen == 0)
454 ulen = skb->len;
455
456 if (ulen < sizeof(*uh))
457 goto short_packet;
458
459 if (ulen < skb->len) {
460 if (pskb_trim_rcsum(skb, ulen))
461 goto short_packet;
462 saddr = &ipv6_hdr(skb)->saddr;
463 daddr = &ipv6_hdr(skb)->daddr;
464 uh = udp_hdr(skb);
465 }
466 }
467
468 if (udp6_csum_init(skb, uh, proto))
469 goto discard;
470
471 /*
472 * Multicast receive code
473 */
474 if (ipv6_addr_is_multicast(daddr))
475 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
476
477 /* Unicast */
478
479 /*
480 * check socket cache ... must talk to Alan about his plans
481 * for sock caches... i'll skip this for now.
482 */
483 sk = __udp6_lib_lookup(skb->dev->nd_net, saddr, uh->source,
484 daddr, uh->dest, inet6_iif(skb), udptable);
485
486 if (sk == NULL) {
487 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
488 goto discard;
489
490 if (udp_lib_checksum_complete(skb))
491 goto discard;
492 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
493
494 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
495
496 kfree_skb(skb);
497 return 0;
498 }
499
500 /* deliver */
501
502 bh_lock_sock_nested(sk);
503 if (!sock_owned_by_user(sk))
504 udpv6_queue_rcv_skb(sk, skb);
505 else
506 sk_add_backlog(sk, skb);
507 bh_unlock_sock(sk);
508 sock_put(sk);
509 return 0;
510
511short_packet:
512 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
513 proto == IPPROTO_UDPLITE ? "-Lite" : "",
514 ulen, skb->len);
515
516discard:
517 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
518 kfree_skb(skb);
519 return 0;
520}
521
522static __inline__ int udpv6_rcv(struct sk_buff *skb)
523{
524 return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
525}
526
527/*
528 * Throw away all pending data and cancel the corking. Socket is locked.
529 */
530static void udp_v6_flush_pending_frames(struct sock *sk)
531{
532 struct udp_sock *up = udp_sk(sk);
533
534 if (up->pending) {
535 up->len = 0;
536 up->pending = 0;
537 ip6_flush_pending_frames(sk);
538 }
539}
540
541/*
542 * Sending
543 */
544
545static int udp_v6_push_pending_frames(struct sock *sk)
546{
547 struct sk_buff *skb;
548 struct udphdr *uh;
549 struct udp_sock *up = udp_sk(sk);
550 struct inet_sock *inet = inet_sk(sk);
551 struct flowi *fl = &inet->cork.fl;
552 int err = 0;
553 int is_udplite = IS_UDPLITE(sk);
554 __wsum csum = 0;
555
556 /* Grab the skbuff where UDP header space exists. */
557 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
558 goto out;
559
560 /*
561 * Create a UDP header
562 */
563 uh = udp_hdr(skb);
564 uh->source = fl->fl_ip_sport;
565 uh->dest = fl->fl_ip_dport;
566 uh->len = htons(up->len);
567 uh->check = 0;
568
569 if (is_udplite)
570 csum = udplite_csum_outgoing(sk, skb);
571 else
572 csum = udp_csum_outgoing(sk, skb);
573
574 /* add protocol-dependent pseudo-header */
575 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
576 up->len, fl->proto, csum );
577 if (uh->check == 0)
578 uh->check = CSUM_MANGLED_0;
579
580 err = ip6_push_pending_frames(sk);
581out:
582 up->len = 0;
583 up->pending = 0;
584 if (!err)
585 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
586 return err;
587}
588
589int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
590 struct msghdr *msg, size_t len)
591{
592 struct ipv6_txoptions opt_space;
593 struct udp_sock *up = udp_sk(sk);
594 struct inet_sock *inet = inet_sk(sk);
595 struct ipv6_pinfo *np = inet6_sk(sk);
596 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
597 struct in6_addr *daddr, *final_p = NULL, final;
598 struct ipv6_txoptions *opt = NULL;
599 struct ip6_flowlabel *flowlabel = NULL;
600 struct flowi fl;
601 struct dst_entry *dst;
602 int addr_len = msg->msg_namelen;
603 int ulen = len;
604 int hlimit = -1;
605 int tclass = -1;
606 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
607 int err;
608 int connected = 0;
609 int is_udplite = IS_UDPLITE(sk);
610 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
611
612 /* destination address check */
613 if (sin6) {
614 if (addr_len < offsetof(struct sockaddr, sa_data))
615 return -EINVAL;
616
617 switch (sin6->sin6_family) {
618 case AF_INET6:
619 if (addr_len < SIN6_LEN_RFC2133)
620 return -EINVAL;
621 daddr = &sin6->sin6_addr;
622 break;
623 case AF_INET:
624 goto do_udp_sendmsg;
625 case AF_UNSPEC:
626 msg->msg_name = sin6 = NULL;
627 msg->msg_namelen = addr_len = 0;
628 daddr = NULL;
629 break;
630 default:
631 return -EINVAL;
632 }
633 } else if (!up->pending) {
634 if (sk->sk_state != TCP_ESTABLISHED)
635 return -EDESTADDRREQ;
636 daddr = &np->daddr;
637 } else
638 daddr = NULL;
639
640 if (daddr) {
641 if (ipv6_addr_v4mapped(daddr)) {
642 struct sockaddr_in sin;
643 sin.sin_family = AF_INET;
644 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
645 sin.sin_addr.s_addr = daddr->s6_addr32[3];
646 msg->msg_name = &sin;
647 msg->msg_namelen = sizeof(sin);
648do_udp_sendmsg:
649 if (__ipv6_only_sock(sk))
650 return -ENETUNREACH;
651 return udp_sendmsg(iocb, sk, msg, len);
652 }
653 }
654
655 if (up->pending == AF_INET)
656 return udp_sendmsg(iocb, sk, msg, len);
657
658 /* Rough check on arithmetic overflow,
659 better check is made in ip6_append_data().
660 */
661 if (len > INT_MAX - sizeof(struct udphdr))
662 return -EMSGSIZE;
663
664 if (up->pending) {
665 /*
666 * There are pending frames.
667 * The socket lock must be held while it's corked.
668 */
669 lock_sock(sk);
670 if (likely(up->pending)) {
671 if (unlikely(up->pending != AF_INET6)) {
672 release_sock(sk);
673 return -EAFNOSUPPORT;
674 }
675 dst = NULL;
676 goto do_append_data;
677 }
678 release_sock(sk);
679 }
680 ulen += sizeof(struct udphdr);
681
682 memset(&fl, 0, sizeof(fl));
683
684 if (sin6) {
685 if (sin6->sin6_port == 0)
686 return -EINVAL;
687
688 fl.fl_ip_dport = sin6->sin6_port;
689 daddr = &sin6->sin6_addr;
690
691 if (np->sndflow) {
692 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
693 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
694 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
695 if (flowlabel == NULL)
696 return -EINVAL;
697 daddr = &flowlabel->dst;
698 }
699 }
700
701 /*
702 * Otherwise it will be difficult to maintain
703 * sk->sk_dst_cache.
704 */
705 if (sk->sk_state == TCP_ESTABLISHED &&
706 ipv6_addr_equal(daddr, &np->daddr))
707 daddr = &np->daddr;
708
709 if (addr_len >= sizeof(struct sockaddr_in6) &&
710 sin6->sin6_scope_id &&
711 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
712 fl.oif = sin6->sin6_scope_id;
713 } else {
714 if (sk->sk_state != TCP_ESTABLISHED)
715 return -EDESTADDRREQ;
716
717 fl.fl_ip_dport = inet->dport;
718 daddr = &np->daddr;
719 fl.fl6_flowlabel = np->flow_label;
720 connected = 1;
721 }
722
723 if (!fl.oif)
724 fl.oif = sk->sk_bound_dev_if;
725
726 if (msg->msg_controllen) {
727 opt = &opt_space;
728 memset(opt, 0, sizeof(struct ipv6_txoptions));
729 opt->tot_len = sizeof(*opt);
730
731 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
732 if (err < 0) {
733 fl6_sock_release(flowlabel);
734 return err;
735 }
736 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
737 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
738 if (flowlabel == NULL)
739 return -EINVAL;
740 }
741 if (!(opt->opt_nflen|opt->opt_flen))
742 opt = NULL;
743 connected = 0;
744 }
745 if (opt == NULL)
746 opt = np->opt;
747 if (flowlabel)
748 opt = fl6_merge_options(&opt_space, flowlabel, opt);
749 opt = ipv6_fixup_options(&opt_space, opt);
750
751 fl.proto = sk->sk_protocol;
752 ipv6_addr_copy(&fl.fl6_dst, daddr);
753 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
754 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
755 fl.fl_ip_sport = inet->sport;
756
757 /* merge ip6_build_xmit from ip6_output */
758 if (opt && opt->srcrt) {
759 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
760 ipv6_addr_copy(&final, &fl.fl6_dst);
761 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
762 final_p = &final;
763 connected = 0;
764 }
765
766 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
767 fl.oif = np->mcast_oif;
768 connected = 0;
769 }
770
771 security_sk_classify_flow(sk, &fl);
772
773 err = ip6_sk_dst_lookup(sk, &dst, &fl);
774 if (err)
775 goto out;
776 if (final_p)
777 ipv6_addr_copy(&fl.fl6_dst, final_p);
778
779 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
780 if (err == -EREMOTE)
781 err = ip6_dst_blackhole(sk, &dst, &fl);
782 if (err < 0)
783 goto out;
784 }
785
786 if (hlimit < 0) {
787 if (ipv6_addr_is_multicast(&fl.fl6_dst))
788 hlimit = np->mcast_hops;
789 else
790 hlimit = np->hop_limit;
791 if (hlimit < 0)
792 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
793 if (hlimit < 0)
794 hlimit = ipv6_get_hoplimit(dst->dev);
795 }
796
797 if (tclass < 0) {
798 tclass = np->tclass;
799 if (tclass < 0)
800 tclass = 0;
801 }
802
803 if (msg->msg_flags&MSG_CONFIRM)
804 goto do_confirm;
805back_from_confirm:
806
807 lock_sock(sk);
808 if (unlikely(up->pending)) {
809 /* The socket is already corked while preparing it. */
810 /* ... which is an evident application bug. --ANK */
811 release_sock(sk);
812
813 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
814 err = -EINVAL;
815 goto out;
816 }
817
818 up->pending = AF_INET6;
819
820do_append_data:
821 up->len += ulen;
822 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
823 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
824 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
825 (struct rt6_info*)dst,
826 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
827 if (err)
828 udp_v6_flush_pending_frames(sk);
829 else if (!corkreq)
830 err = udp_v6_push_pending_frames(sk);
831 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
832 up->pending = 0;
833
834 if (dst) {
835 if (connected) {
836 ip6_dst_store(sk, dst,
837 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
838 &np->daddr : NULL,
839#ifdef CONFIG_IPV6_SUBTREES
840 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
841 &np->saddr :
842#endif
843 NULL);
844 } else {
845 dst_release(dst);
846 }
847 }
848
849 if (err > 0)
850 err = np->recverr ? net_xmit_errno(err) : 0;
851 release_sock(sk);
852out:
853 fl6_sock_release(flowlabel);
854 if (!err)
855 return len;
856 /*
857 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
858 * ENOBUFS might not be good (it's not tunable per se), but otherwise
859 * we don't have a good statistic (IpOutDiscards but it can be too many
860 * things). We could add another new stat but at least for now that
861 * seems like overkill.
862 */
863 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
864 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
865 }
866 return err;
867
868do_confirm:
869 dst_confirm(dst);
870 if (!(msg->msg_flags&MSG_PROBE) || len)
871 goto back_from_confirm;
872 err = 0;
873 goto out;
874}
875
876int udpv6_destroy_sock(struct sock *sk)
877{
878 lock_sock(sk);
879 udp_v6_flush_pending_frames(sk);
880 release_sock(sk);
881
882 inet6_destroy_sock(sk);
883
884 return 0;
885}
886
887/*
888 * Socket option code for UDP
889 */
890int udpv6_setsockopt(struct sock *sk, int level, int optname,
891 char __user *optval, int optlen)
892{
893 if (level == SOL_UDP || level == SOL_UDPLITE)
894 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
895 udp_v6_push_pending_frames);
896 return ipv6_setsockopt(sk, level, optname, optval, optlen);
897}
898
899#ifdef CONFIG_COMPAT
900int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
901 char __user *optval, int optlen)
902{
903 if (level == SOL_UDP || level == SOL_UDPLITE)
904 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
905 udp_v6_push_pending_frames);
906 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
907}
908#endif
909
910int udpv6_getsockopt(struct sock *sk, int level, int optname,
911 char __user *optval, int __user *optlen)
912{
913 if (level == SOL_UDP || level == SOL_UDPLITE)
914 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
915 return ipv6_getsockopt(sk, level, optname, optval, optlen);
916}
917
918#ifdef CONFIG_COMPAT
919int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
920 char __user *optval, int __user *optlen)
921{
922 if (level == SOL_UDP || level == SOL_UDPLITE)
923 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
924 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
925}
926#endif
927
928static struct inet6_protocol udpv6_protocol = {
929 .handler = udpv6_rcv,
930 .err_handler = udpv6_err,
931 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
932};
933
934/* ------------------------------------------------------------------------ */
935#ifdef CONFIG_PROC_FS
936
937static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
938{
939 struct inet_sock *inet = inet_sk(sp);
940 struct ipv6_pinfo *np = inet6_sk(sp);
941 struct in6_addr *dest, *src;
942 __u16 destp, srcp;
943
944 dest = &np->daddr;
945 src = &np->rcv_saddr;
946 destp = ntohs(inet->dport);
947 srcp = ntohs(inet->sport);
948 seq_printf(seq,
949 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
950 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
951 bucket,
952 src->s6_addr32[0], src->s6_addr32[1],
953 src->s6_addr32[2], src->s6_addr32[3], srcp,
954 dest->s6_addr32[0], dest->s6_addr32[1],
955 dest->s6_addr32[2], dest->s6_addr32[3], destp,
956 sp->sk_state,
957 atomic_read(&sp->sk_wmem_alloc),
958 atomic_read(&sp->sk_rmem_alloc),
959 0, 0L, 0,
960 sock_i_uid(sp), 0,
961 sock_i_ino(sp),
962 atomic_read(&sp->sk_refcnt), sp);
963}
964
965int udp6_seq_show(struct seq_file *seq, void *v)
966{
967 if (v == SEQ_START_TOKEN)
968 seq_printf(seq,
969 " sl "
970 "local_address "
971 "remote_address "
972 "st tx_queue rx_queue tr tm->when retrnsmt"
973 " uid timeout inode\n");
974 else
975 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
976 return 0;
977}
978
979static struct file_operations udp6_seq_fops;
980static struct udp_seq_afinfo udp6_seq_afinfo = {
981 .owner = THIS_MODULE,
982 .name = "udp6",
983 .family = AF_INET6,
984 .hashtable = udp_hash,
985 .seq_show = udp6_seq_show,
986 .seq_fops = &udp6_seq_fops,
987};
988
989int __init udp6_proc_init(void)
990{
991 return udp_proc_register(&udp6_seq_afinfo);
992}
993
994void udp6_proc_exit(void) {
995 udp_proc_unregister(&udp6_seq_afinfo);
996}
997#endif /* CONFIG_PROC_FS */
998
999/* ------------------------------------------------------------------------ */
1000
1001DEFINE_PROTO_INUSE(udpv6)
1002
1003struct proto udpv6_prot = {
1004 .name = "UDPv6",
1005 .owner = THIS_MODULE,
1006 .close = udp_lib_close,
1007 .connect = ip6_datagram_connect,
1008 .disconnect = udp_disconnect,
1009 .ioctl = udp_ioctl,
1010 .destroy = udpv6_destroy_sock,
1011 .setsockopt = udpv6_setsockopt,
1012 .getsockopt = udpv6_getsockopt,
1013 .sendmsg = udpv6_sendmsg,
1014 .recvmsg = udpv6_recvmsg,
1015 .backlog_rcv = udpv6_queue_rcv_skb,
1016 .hash = udp_lib_hash,
1017 .unhash = udp_lib_unhash,
1018 .get_port = udp_v6_get_port,
1019 .memory_allocated = &udp_memory_allocated,
1020 .sysctl_mem = sysctl_udp_mem,
1021 .sysctl_wmem = &sysctl_udp_wmem_min,
1022 .sysctl_rmem = &sysctl_udp_rmem_min,
1023 .obj_size = sizeof(struct udp6_sock),
1024#ifdef CONFIG_COMPAT
1025 .compat_setsockopt = compat_udpv6_setsockopt,
1026 .compat_getsockopt = compat_udpv6_getsockopt,
1027#endif
1028 REF_PROTO_INUSE(udpv6)
1029};
1030
1031static struct inet_protosw udpv6_protosw = {
1032 .type = SOCK_DGRAM,
1033 .protocol = IPPROTO_UDP,
1034 .prot = &udpv6_prot,
1035 .ops = &inet6_dgram_ops,
1036 .capability =-1,
1037 .no_check = UDP_CSUM_DEFAULT,
1038 .flags = INET_PROTOSW_PERMANENT,
1039};
1040
1041
1042int __init udpv6_init(void)
1043{
1044 int ret;
1045
1046 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1047 if (ret)
1048 goto out;
1049
1050 ret = inet6_register_protosw(&udpv6_protosw);
1051 if (ret)
1052 goto out_udpv6_protocol;
1053out:
1054 return ret;
1055
1056out_udpv6_protocol:
1057 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1058 goto out;
1059}
1060
1061void udpv6_exit(void)
1062{
1063 inet6_unregister_protosw(&udpv6_protosw);
1064 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1065}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-07 20:52:48 -0500