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[IPV6]: remove useless test in ip6_append_data
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / udp.c
CommitLineData
1da177e4
LT		 1/*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
11 *
12 * Fixes:
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
15 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
16 * a single port at the same time.
17 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26#include <linux/config.h>
27#include <linux/errno.h>
28#include <linux/types.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/sched.h>
32#include <linux/net.h>
33#include <linux/in6.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/ipv6.h>
37#include <linux/icmpv6.h>
38#include <linux/init.h>
3305b80c 39#include <linux/skbuff.h>
1da177e4
LT		 40#include <asm/uaccess.h>
41
42#include <net/sock.h>
43#include <net/snmp.h>
44
45#include <net/ipv6.h>
46#include <net/ndisc.h>
47#include <net/protocol.h>
48#include <net/transp_v6.h>
49#include <net/ip6_route.h>
50#include <net/addrconf.h>
51#include <net/ip.h>
52#include <net/udp.h>
53#include <net/raw.h>
54#include <net/inet_common.h>
c752f073 55#include <net/tcp_states.h>
1da177e4
LT		 56
57#include <net/ip6_checksum.h>
58#include <net/xfrm.h>
59
60#include <linux/proc_fs.h>
61#include <linux/seq_file.h>
62
ba89966c 63DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
1da177e4
LT		 64
65/* Grrr, addr_type already calculated by caller, but I don't want
66 * to add some silly "cookie" argument to this method just for that.
67 */
68static int udp_v6_get_port(struct sock *sk, unsigned short snum)
69{
70 struct sock *sk2;
71 struct hlist_node *node;
72
73 write_lock_bh(&udp_hash_lock);
74 if (snum == 0) {
75 int best_size_so_far, best, result, i;
76
77 if (udp_port_rover > sysctl_local_port_range[1] ||
78 udp_port_rover < sysctl_local_port_range[0])
79 udp_port_rover = sysctl_local_port_range[0];
80 best_size_so_far = 32767;
81 best = result = udp_port_rover;
82 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
83 int size;
84 struct hlist_head *list;
85
86 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
87 if (hlist_empty(list)) {
88 if (result > sysctl_local_port_range[1])
89 result = sysctl_local_port_range[0] +
90 ((result - sysctl_local_port_range[0]) &
91 (UDP_HTABLE_SIZE - 1));
92 goto gotit;
93 }
94 size = 0;
95 sk_for_each(sk2, node, list)
96 if (++size >= best_size_so_far)
97 goto next;
98 best_size_so_far = size;
99 best = result;
100 next:;
101 }
102 result = best;
87bf9c97 103 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
1da177e4
LT		 104 if (result > sysctl_local_port_range[1])
105 result = sysctl_local_port_range[0]
106 + ((result - sysctl_local_port_range[0]) &
107 (UDP_HTABLE_SIZE - 1));
108 if (!udp_lport_inuse(result))
109 break;
110 }
87bf9c97
YH		 111 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
112 goto fail;
1da177e4
LT		 113gotit:
114 udp_port_rover = snum = result;
115 } else {
116 sk_for_each(sk2, node,
117 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
118 if (inet_sk(sk2)->num == snum &&
119 sk2 != sk &&
120 (!sk2->sk_bound_dev_if ||
121 !sk->sk_bound_dev_if ||
122 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
123 (!sk2->sk_reuse || !sk->sk_reuse) &&
124 ipv6_rcv_saddr_equal(sk, sk2))
125 goto fail;
126 }
127 }
128
129 inet_sk(sk)->num = snum;
130 if (sk_unhashed(sk)) {
131 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
132 sock_prot_inc_use(sk->sk_prot);
133 }
134 write_unlock_bh(&udp_hash_lock);
135 return 0;
136
137fail:
138 write_unlock_bh(&udp_hash_lock);
139 return 1;
140}
141
142static void udp_v6_hash(struct sock *sk)
143{
144 BUG();
145}
146
147static void udp_v6_unhash(struct sock *sk)
148{
149 write_lock_bh(&udp_hash_lock);
150 if (sk_del_node_init(sk)) {
151 inet_sk(sk)->num = 0;
152 sock_prot_dec_use(sk->sk_prot);
153 }
154 write_unlock_bh(&udp_hash_lock);
155}
156
157static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
158 struct in6_addr *daddr, u16 dport, int dif)
159{
160 struct sock *sk, *result = NULL;
161 struct hlist_node *node;
162 unsigned short hnum = ntohs(dport);
163 int badness = -1;
164
165 read_lock(&udp_hash_lock);
166 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
167 struct inet_sock *inet = inet_sk(sk);
168
169 if (inet->num == hnum && sk->sk_family == PF_INET6) {
170 struct ipv6_pinfo *np = inet6_sk(sk);
171 int score = 0;
172 if (inet->dport) {
173 if (inet->dport != sport)
174 continue;
175 score++;
176 }
177 if (!ipv6_addr_any(&np->rcv_saddr)) {
178 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
179 continue;
180 score++;
181 }
182 if (!ipv6_addr_any(&np->daddr)) {
183 if (!ipv6_addr_equal(&np->daddr, saddr))
184 continue;
185 score++;
186 }
187 if (sk->sk_bound_dev_if) {
188 if (sk->sk_bound_dev_if != dif)
189 continue;
190 score++;
191 }
192 if(score == 4) {
193 result = sk;
194 break;
195 } else if(score > badness) {
196 result = sk;
197 badness = score;
198 }
199 }
200 }
201 if (result)
202 sock_hold(result);
203 read_unlock(&udp_hash_lock);
204 return result;
205}
206
207/*
208 *
209 */
210
211static void udpv6_close(struct sock *sk, long timeout)
212{
213 sk_common_release(sk);
214}
215
216/*
217 * This should be easy, if there is something there we
218 * return it, otherwise we block.
219 */
220
221static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
222 struct msghdr *msg, size_t len,
223 int noblock, int flags, int *addr_len)
224{
225 struct ipv6_pinfo *np = inet6_sk(sk);
226 struct inet_sock *inet = inet_sk(sk);
227 struct sk_buff *skb;
228 size_t copied;
229 int err;
230
231 if (addr_len)
232 *addr_len=sizeof(struct sockaddr_in6);
233
234 if (flags & MSG_ERRQUEUE)
235 return ipv6_recv_error(sk, msg, len);
236
237try_again:
238 skb = skb_recv_datagram(sk, flags, noblock, &err);
239 if (!skb)
240 goto out;
241
242 copied = skb->len - sizeof(struct udphdr);
243 if (copied > len) {
244 copied = len;
245 msg->msg_flags |= MSG_TRUNC;
246 }
247
248 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
249 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
250 copied);
251 } else if (msg->msg_flags&MSG_TRUNC) {
fb286bb2 252 if (__skb_checksum_complete(skb))
1da177e4
LT		 253 goto csum_copy_err;
254 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
255 copied);
256 } else {
257 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
258 if (err == -EINVAL)
259 goto csum_copy_err;
260 }
261 if (err)
262 goto out_free;
263
264 sock_recv_timestamp(msg, sk, skb);
265
266 /* Copy the address. */
267 if (msg->msg_name) {
268 struct sockaddr_in6 *sin6;
269
270 sin6 = (struct sockaddr_in6 *) msg->msg_name;
271 sin6->sin6_family = AF_INET6;
272 sin6->sin6_port = skb->h.uh->source;
273 sin6->sin6_flowinfo = 0;
274 sin6->sin6_scope_id = 0;
275
276 if (skb->protocol == htons(ETH_P_IP))
277 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
278 htonl(0xffff), skb->nh.iph->saddr);
279 else {
280 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
281 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
282 sin6->sin6_scope_id = IP6CB(skb)->iif;
283 }
284
285 }
286 if (skb->protocol == htons(ETH_P_IP)) {
287 if (inet->cmsg_flags)
288 ip_cmsg_recv(msg, skb);
289 } else {
290 if (np->rxopt.all)
291 datagram_recv_ctl(sk, msg, skb);
292 }
293
294 err = copied;
295 if (flags & MSG_TRUNC)
296 err = skb->len - sizeof(struct udphdr);
297
298out_free:
299 skb_free_datagram(sk, skb);
300out:
301 return err;
302
303csum_copy_err:
3305b80c 304 skb_kill_datagram(sk, skb, flags);
1da177e4
LT		 305
306 if (flags & MSG_DONTWAIT) {
307 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
308 return -EAGAIN;
309 }
310 goto try_again;
311}
312
313static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
314 int type, int code, int offset, __u32 info)
315{
316 struct ipv6_pinfo *np;
317 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
318 struct net_device *dev = skb->dev;
319 struct in6_addr *saddr = &hdr->saddr;
320 struct in6_addr *daddr = &hdr->daddr;
321 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
322 struct sock *sk;
323 int err;
324
325 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
326
327 if (sk == NULL)
328 return;
329
330 np = inet6_sk(sk);
331
332 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
333 goto out;
334
335 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
336 goto out;
337
338 if (np->recverr)
339 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
340
341 sk->sk_err = err;
342 sk->sk_error_report(sk);
343out:
344 sock_put(sk);
345}
346
347static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
348{
349 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
350 kfree_skb(skb);
351 return -1;
352 }
353
fb286bb2
HX		 354 if (skb_checksum_complete(skb)) {
355 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
356 kfree_skb(skb);
357 return 0;
1da177e4
LT		 358 }
359
360 if (sock_queue_rcv_skb(sk,skb)<0) {
361 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
362 kfree_skb(skb);
363 return 0;
364 }
365 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
366 return 0;
367}
368
369static struct sock *udp_v6_mcast_next(struct sock *sk,
370 u16 loc_port, struct in6_addr *loc_addr,
371 u16 rmt_port, struct in6_addr *rmt_addr,
372 int dif)
373{
374 struct hlist_node *node;
375 struct sock *s = sk;
376 unsigned short num = ntohs(loc_port);
377
378 sk_for_each_from(s, node) {
379 struct inet_sock *inet = inet_sk(s);
380
381 if (inet->num == num && s->sk_family == PF_INET6) {
382 struct ipv6_pinfo *np = inet6_sk(s);
383 if (inet->dport) {
384 if (inet->dport != rmt_port)
385 continue;
386 }
387 if (!ipv6_addr_any(&np->daddr) &&
388 !ipv6_addr_equal(&np->daddr, rmt_addr))
389 continue;
390
391 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
392 continue;
393
394 if (!ipv6_addr_any(&np->rcv_saddr)) {
40796c5e
DS		 395 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
396 continue;
1da177e4
LT		 397 }
398 if(!inet6_mc_check(s, loc_addr, rmt_addr))
399 continue;
400 return s;
401 }
402 }
403 return NULL;
404}
405
406/*
407 * Note: called only from the BH handler context,
408 * so we don't need to lock the hashes.
409 */
410static void udpv6_mcast_deliver(struct udphdr *uh,
411 struct in6_addr *saddr, struct in6_addr *daddr,
412 struct sk_buff *skb)
413{
414 struct sock *sk, *sk2;
415 int dif;
416
417 read_lock(&udp_hash_lock);
418 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
419 dif = skb->dev->ifindex;
420 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
421 if (!sk) {
422 kfree_skb(skb);
423 goto out;
424 }
425
426 sk2 = sk;
427 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
428 uh->source, saddr, dif))) {
429 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
430 if (buff)
431 udpv6_queue_rcv_skb(sk2, buff);
432 }
433 udpv6_queue_rcv_skb(sk, skb);
434out:
435 read_unlock(&udp_hash_lock);
436}
437
951dbc8a 438static int udpv6_rcv(struct sk_buff **pskb)
1da177e4
LT		 439{
440 struct sk_buff *skb = *pskb;
441 struct sock *sk;
442 struct udphdr *uh;
443 struct net_device *dev = skb->dev;
444 struct in6_addr *saddr, *daddr;
445 u32 ulen = 0;
446
447 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
448 goto short_packet;
449
450 saddr = &skb->nh.ipv6h->saddr;
451 daddr = &skb->nh.ipv6h->daddr;
452 uh = skb->h.uh;
453
454 ulen = ntohs(uh->len);
455
456 /* Check for jumbo payload */
457 if (ulen == 0)
458 ulen = skb->len;
459
460 if (ulen > skb->len || ulen < sizeof(*uh))
461 goto short_packet;
462
463 if (uh->check == 0) {
464 /* RFC 2460 section 8.1 says that we SHOULD log
465 this error. Well, it is reasonable.
466 */
64ce2073 467 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
1da177e4
LT		 468 goto discard;
469 }
470
471 if (ulen < skb->len) {
42ca89c1 472 if (pskb_trim_rcsum(skb, ulen))
1da177e4
LT		 473 goto discard;
474 saddr = &skb->nh.ipv6h->saddr;
475 daddr = &skb->nh.ipv6h->daddr;
476 uh = skb->h.uh;
477 }
478
fb286bb2
HX		 479 if (skb->ip_summed == CHECKSUM_HW &&
480 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
1da177e4 481 skb->ip_summed = CHECKSUM_UNNECESSARY;
fb286bb2 482
1da177e4
LT		 483 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
484 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
485
486 /*
487 * Multicast receive code
488 */
489 if (ipv6_addr_is_multicast(daddr)) {
490 udpv6_mcast_deliver(uh, saddr, daddr, skb);
491 return 0;
492 }
493
494 /* Unicast */
495
496 /*
497 * check socket cache ... must talk to Alan about his plans
498 * for sock caches... i'll skip this for now.
499 */
500 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
501
502 if (sk == NULL) {
503 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
504 goto discard;
505
fb286bb2 506 if (skb_checksum_complete(skb))
1da177e4
LT		 507 goto discard;
508 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
509
510 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
511
512 kfree_skb(skb);
513 return(0);
514 }
515
516 /* deliver */
517
518 udpv6_queue_rcv_skb(sk, skb);
519 sock_put(sk);
520 return(0);
521
522short_packet:
523 if (net_ratelimit())
524 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
525
526discard:
527 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
528 kfree_skb(skb);
529 return(0);
530}
531/*
532 * Throw away all pending data and cancel the corking. Socket is locked.
533 */
534static void udp_v6_flush_pending_frames(struct sock *sk)
535{
536 struct udp_sock *up = udp_sk(sk);
537
538 if (up->pending) {
539 up->len = 0;
540 up->pending = 0;
541 ip6_flush_pending_frames(sk);
542 }
543}
544
545/*
546 * Sending
547 */
548
549static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
550{
551 struct sk_buff *skb;
552 struct udphdr *uh;
553 struct inet_sock *inet = inet_sk(sk);
554 struct flowi *fl = &inet->cork.fl;
555 int err = 0;
556
557 /* Grab the skbuff where UDP header space exists. */
558 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
559 goto out;
560
561 /*
562 * Create a UDP header
563 */
564 uh = skb->h.uh;
565 uh->source = fl->fl_ip_sport;
566 uh->dest = fl->fl_ip_dport;
567 uh->len = htons(up->len);
568 uh->check = 0;
569
570 if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
571 skb->ip_summed = CHECKSUM_NONE;
572 goto send;
573 }
574
575 if (skb_queue_len(&sk->sk_write_queue) == 1) {
576 skb->csum = csum_partial((char *)uh,
577 sizeof(struct udphdr), skb->csum);
578 uh->check = csum_ipv6_magic(&fl->fl6_src,
579 &fl->fl6_dst,
580 up->len, fl->proto, skb->csum);
581 } else {
582 u32 tmp_csum = 0;
583
584 skb_queue_walk(&sk->sk_write_queue, skb) {
585 tmp_csum = csum_add(tmp_csum, skb->csum);
586 }
587 tmp_csum = csum_partial((char *)uh,
588 sizeof(struct udphdr), tmp_csum);
589 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
590 &fl->fl6_dst,
591 up->len, fl->proto, tmp_csum);
592 uh->check = tmp_csum;
593
594 }
595 if (uh->check == 0)
596 uh->check = -1;
597
598send:
599 err = ip6_push_pending_frames(sk);
600out:
601 up->len = 0;
602 up->pending = 0;
603 return err;
604}
605
606static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
607 struct msghdr *msg, size_t len)
608{
609 struct ipv6_txoptions opt_space;
610 struct udp_sock *up = udp_sk(sk);
611 struct inet_sock *inet = inet_sk(sk);
612 struct ipv6_pinfo *np = inet6_sk(sk);
613 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
614 struct in6_addr *daddr, *final_p = NULL, final;
615 struct ipv6_txoptions *opt = NULL;
616 struct ip6_flowlabel *flowlabel = NULL;
617 struct flowi *fl = &inet->cork.fl;
618 struct dst_entry *dst;
619 int addr_len = msg->msg_namelen;
620 int ulen = len;
621 int hlimit = -1;
41a1f8ea 622 int tclass = -1;
1da177e4
LT		 623 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
624 int err;
987905de 625 int connected = 0;
1da177e4
LT		 626
627 /* destination address check */
628 if (sin6) {
629 if (addr_len < offsetof(struct sockaddr, sa_data))
630 return -EINVAL;
631
632 switch (sin6->sin6_family) {
633 case AF_INET6:
634 if (addr_len < SIN6_LEN_RFC2133)
635 return -EINVAL;
636 daddr = &sin6->sin6_addr;
637 break;
638 case AF_INET:
639 goto do_udp_sendmsg;
640 case AF_UNSPEC:
641 msg->msg_name = sin6 = NULL;
642 msg->msg_namelen = addr_len = 0;
643 daddr = NULL;
644 break;
645 default:
646 return -EINVAL;
647 }
648 } else if (!up->pending) {
649 if (sk->sk_state != TCP_ESTABLISHED)
650 return -EDESTADDRREQ;
651 daddr = &np->daddr;
652 } else
653 daddr = NULL;
654
655 if (daddr) {
656 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
657 struct sockaddr_in sin;
658 sin.sin_family = AF_INET;
659 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
660 sin.sin_addr.s_addr = daddr->s6_addr32[3];
661 msg->msg_name = &sin;
662 msg->msg_namelen = sizeof(sin);
663do_udp_sendmsg:
664 if (__ipv6_only_sock(sk))
665 return -ENETUNREACH;
666 return udp_sendmsg(iocb, sk, msg, len);
667 }
668 }
669
670 if (up->pending == AF_INET)
671 return udp_sendmsg(iocb, sk, msg, len);
672
673 /* Rough check on arithmetic overflow,
674 better check is made in ip6_build_xmit
675 */
676 if (len > INT_MAX - sizeof(struct udphdr))
677 return -EMSGSIZE;
678
679 if (up->pending) {
680 /*
681 * There are pending frames.
682 * The socket lock must be held while it's corked.
683 */
684 lock_sock(sk);
685 if (likely(up->pending)) {
686 if (unlikely(up->pending != AF_INET6)) {
687 release_sock(sk);
688 return -EAFNOSUPPORT;
689 }
690 dst = NULL;
691 goto do_append_data;
692 }
693 release_sock(sk);
694 }
695 ulen += sizeof(struct udphdr);
696
697 memset(fl, 0, sizeof(*fl));
698
699 if (sin6) {
700 if (sin6->sin6_port == 0)
701 return -EINVAL;
702
703 fl->fl_ip_dport = sin6->sin6_port;
704 daddr = &sin6->sin6_addr;
705
706 if (np->sndflow) {
707 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
708 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
709 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
710 if (flowlabel == NULL)
711 return -EINVAL;
712 daddr = &flowlabel->dst;
713 }
714 }
715
716 /*
717 * Otherwise it will be difficult to maintain
718 * sk->sk_dst_cache.
719 */
720 if (sk->sk_state == TCP_ESTABLISHED &&
721 ipv6_addr_equal(daddr, &np->daddr))
722 daddr = &np->daddr;
723
724 if (addr_len >= sizeof(struct sockaddr_in6) &&
725 sin6->sin6_scope_id &&
726 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
727 fl->oif = sin6->sin6_scope_id;
728 } else {
729 if (sk->sk_state != TCP_ESTABLISHED)
730 return -EDESTADDRREQ;
731
732 fl->fl_ip_dport = inet->dport;
733 daddr = &np->daddr;
734 fl->fl6_flowlabel = np->flow_label;
987905de 735 connected = 1;
1da177e4
LT		 736 }
737
738 if (!fl->oif)
739 fl->oif = sk->sk_bound_dev_if;
740
741 if (msg->msg_controllen) {
742 opt = &opt_space;
743 memset(opt, 0, sizeof(struct ipv6_txoptions));
744 opt->tot_len = sizeof(*opt);
745
41a1f8ea 746 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
1da177e4
LT		 747 if (err < 0) {
748 fl6_sock_release(flowlabel);
749 return err;
750 }
751 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
752 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
753 if (flowlabel == NULL)
754 return -EINVAL;
755 }
756 if (!(opt->opt_nflen|opt->opt_flen))
757 opt = NULL;
987905de 758 connected = 0;
1da177e4
LT		 759 }
760 if (opt == NULL)
761 opt = np->opt;
df9890c3
YH		 762 if (flowlabel)
763 opt = fl6_merge_options(&opt_space, flowlabel, opt);
764 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4
LT		 765
766 fl->proto = IPPROTO_UDP;
767 ipv6_addr_copy(&fl->fl6_dst, daddr);
768 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
769 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
770 fl->fl_ip_sport = inet->sport;
771
772 /* merge ip6_build_xmit from ip6_output */
773 if (opt && opt->srcrt) {
774 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
775 ipv6_addr_copy(&final, &fl->fl6_dst);
776 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
777 final_p = &final;
987905de 778 connected = 0;
1da177e4
LT		 779 }
780
987905de 781 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
1da177e4 782 fl->oif = np->mcast_oif;
987905de
MK		 783 connected = 0;
784 }
1da177e4
LT		 785
786 err = ip6_dst_lookup(sk, &dst, fl);
787 if (err)
788 goto out;
789 if (final_p)
790 ipv6_addr_copy(&fl->fl6_dst, final_p);
791
e104411b 792 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
1da177e4 793 goto out;
1da177e4
LT		 794
795 if (hlimit < 0) {
796 if (ipv6_addr_is_multicast(&fl->fl6_dst))
797 hlimit = np->mcast_hops;
798 else
799 hlimit = np->hop_limit;
800 if (hlimit < 0)
801 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
802 if (hlimit < 0)
803 hlimit = ipv6_get_hoplimit(dst->dev);
804 }
805
41a1f8ea
YH		 806 if (tclass < 0) {
807 tclass = np->tclass;
808 if (tclass < 0)
809 tclass = 0;
810 }
811
1da177e4
LT		 812 if (msg->msg_flags&MSG_CONFIRM)
813 goto do_confirm;
814back_from_confirm:
815
816 lock_sock(sk);
817 if (unlikely(up->pending)) {
818 /* The socket is already corked while preparing it. */
819 /* ... which is an evident application bug. --ANK */
820 release_sock(sk);
821
64ce2073 822 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 823 err = -EINVAL;
824 goto out;
825 }
826
827 up->pending = AF_INET6;
828
829do_append_data:
830 up->len += ulen;
41a1f8ea
YH		 831 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
832 sizeof(struct udphdr), hlimit, tclass, opt, fl,
833 (struct rt6_info*)dst,
834 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1da177e4
LT		 835 if (err)
836 udp_v6_flush_pending_frames(sk);
837 else if (!corkreq)
838 err = udp_v6_push_pending_frames(sk, up);
839
a5e7c210
DM		 840 if (dst) {
841 if (connected) {
842 ip6_dst_store(sk, dst,
843 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
844 &np->daddr : NULL);
845 } else {
846 dst_release(dst);
847 }
848 }
849
1da177e4
LT		 850 if (err > 0)
851 err = np->recverr ? net_xmit_errno(err) : 0;
852 release_sock(sk);
853out:
854 fl6_sock_release(flowlabel);
855 if (!err) {
856 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
857 return len;
858 }
859 return err;
860
861do_confirm:
862 dst_confirm(dst);
863 if (!(msg->msg_flags&MSG_PROBE) || len)
864 goto back_from_confirm;
865 err = 0;
866 goto out;
867}
868
869static int udpv6_destroy_sock(struct sock *sk)
870{
871 lock_sock(sk);
872 udp_v6_flush_pending_frames(sk);
873 release_sock(sk);
874
875 inet6_destroy_sock(sk);
876
877 return 0;
878}
879
880/*
881 * Socket option code for UDP
882 */
883static int udpv6_setsockopt(struct sock *sk, int level, int optname,
884 char __user *optval, int optlen)
885{
886 struct udp_sock *up = udp_sk(sk);
887 int val;
888 int err = 0;
889
890 if (level != SOL_UDP)
891 return ipv6_setsockopt(sk, level, optname, optval, optlen);
892
893 if(optlen<sizeof(int))
894 return -EINVAL;
895
896 if (get_user(val, (int __user *)optval))
897 return -EFAULT;
898
899 switch(optname) {
900 case UDP_CORK:
901 if (val != 0) {
902 up->corkflag = 1;
903 } else {
904 up->corkflag = 0;
905 lock_sock(sk);
906 udp_v6_push_pending_frames(sk, up);
907 release_sock(sk);
908 }
909 break;
910
911 case UDP_ENCAP:
912 switch (val) {
913 case 0:
914 up->encap_type = val;
915 break;
916 default:
917 err = -ENOPROTOOPT;
918 break;
919 }
920 break;
921
922 default:
923 err = -ENOPROTOOPT;
924 break;
925 };
926
927 return err;
928}
929
930static int udpv6_getsockopt(struct sock *sk, int level, int optname,
931 char __user *optval, int __user *optlen)
932{
933 struct udp_sock *up = udp_sk(sk);
934 int val, len;
935
936 if (level != SOL_UDP)
937 return ipv6_getsockopt(sk, level, optname, optval, optlen);
938
939 if(get_user(len,optlen))
940 return -EFAULT;
941
942 len = min_t(unsigned int, len, sizeof(int));
943
944 if(len < 0)
945 return -EINVAL;
946
947 switch(optname) {
948 case UDP_CORK:
949 val = up->corkflag;
950 break;
951
952 case UDP_ENCAP:
953 val = up->encap_type;
954 break;
955
956 default:
957 return -ENOPROTOOPT;
958 };
959
960 if(put_user(len, optlen))
961 return -EFAULT;
962 if(copy_to_user(optval, &val,len))
963 return -EFAULT;
964 return 0;
965}
966
967static struct inet6_protocol udpv6_protocol = {
968 .handler = udpv6_rcv,
969 .err_handler = udpv6_err,
970 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
971};
972
973/* ------------------------------------------------------------------------ */
974#ifdef CONFIG_PROC_FS
975
976static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
977{
978 struct inet_sock *inet = inet_sk(sp);
979 struct ipv6_pinfo *np = inet6_sk(sp);
980 struct in6_addr *dest, *src;
981 __u16 destp, srcp;
982
983 dest = &np->daddr;
984 src = &np->rcv_saddr;
985 destp = ntohs(inet->dport);
986 srcp = ntohs(inet->sport);
987 seq_printf(seq,
988 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
989 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
990 bucket,
991 src->s6_addr32[0], src->s6_addr32[1],
992 src->s6_addr32[2], src->s6_addr32[3], srcp,
993 dest->s6_addr32[0], dest->s6_addr32[1],
994 dest->s6_addr32[2], dest->s6_addr32[3], destp,
995 sp->sk_state,
996 atomic_read(&sp->sk_wmem_alloc),
997 atomic_read(&sp->sk_rmem_alloc),
998 0, 0L, 0,
999 sock_i_uid(sp), 0,
1000 sock_i_ino(sp),
1001 atomic_read(&sp->sk_refcnt), sp);
1002}
1003
1004static int udp6_seq_show(struct seq_file *seq, void *v)
1005{
1006 if (v == SEQ_START_TOKEN)
1007 seq_printf(seq,
1008 " sl "
1009 "local_address "
1010 "remote_address "
1011 "st tx_queue rx_queue tr tm->when retrnsmt"
1012 " uid timeout inode\n");
1013 else
1014 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1015 return 0;
1016}
1017
1018static struct file_operations udp6_seq_fops;
1019static struct udp_seq_afinfo udp6_seq_afinfo = {
1020 .owner = THIS_MODULE,
1021 .name = "udp6",
1022 .family = AF_INET6,
1023 .seq_show = udp6_seq_show,
1024 .seq_fops = &udp6_seq_fops,
1025};
1026
1027int __init udp6_proc_init(void)
1028{
1029 return udp_proc_register(&udp6_seq_afinfo);
1030}
1031
1032void udp6_proc_exit(void) {
1033 udp_proc_unregister(&udp6_seq_afinfo);
1034}
1035#endif /* CONFIG_PROC_FS */
1036
1037/* ------------------------------------------------------------------------ */
1038
1039struct proto udpv6_prot = {
1040 .name = "UDPv6",
1041 .owner = THIS_MODULE,
1042 .close = udpv6_close,
1043 .connect = ip6_datagram_connect,
1044 .disconnect = udp_disconnect,
1045 .ioctl = udp_ioctl,
1046 .destroy = udpv6_destroy_sock,
1047 .setsockopt = udpv6_setsockopt,
1048 .getsockopt = udpv6_getsockopt,
1049 .sendmsg = udpv6_sendmsg,
1050 .recvmsg = udpv6_recvmsg,
1051 .backlog_rcv = udpv6_queue_rcv_skb,
1052 .hash = udp_v6_hash,
1053 .unhash = udp_v6_unhash,
1054 .get_port = udp_v6_get_port,
1055 .obj_size = sizeof(struct udp6_sock),
1056};
1057
1da177e4
LT		 1058static struct inet_protosw udpv6_protosw = {
1059 .type = SOCK_DGRAM,
1060 .protocol = IPPROTO_UDP,
1061 .prot = &udpv6_prot,
1062 .ops = &inet6_dgram_ops,
1063 .capability =-1,
1064 .no_check = UDP_CSUM_DEFAULT,
1065 .flags = INET_PROTOSW_PERMANENT,
1066};
1067
1068
1069void __init udpv6_init(void)
1070{
1071 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1072 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1073 inet6_register_protosw(&udpv6_protosw);
1074}
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