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[NET]: Replace CHECKSUM_HW by CHECKSUM_PARTIAL/CHECKSUM_COMPLETE
[GitHub/mt8127/android_kernel_alcatel_ttab.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
1da177e4
LT		 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>
3305b80c 38#include <linux/skbuff.h>
1da177e4
LT		 39#include <asm/uaccess.h>
40
41#include <net/sock.h>
42#include <net/snmp.h>
43
44#include <net/ipv6.h>
45#include <net/ndisc.h>
46#include <net/protocol.h>
47#include <net/transp_v6.h>
48#include <net/ip6_route.h>
49#include <net/addrconf.h>
50#include <net/ip.h>
51#include <net/udp.h>
52#include <net/raw.h>
53#include <net/inet_common.h>
c752f073 54#include <net/tcp_states.h>
1da177e4
LT		 55
56#include <net/ip6_checksum.h>
57#include <net/xfrm.h>
58
59#include <linux/proc_fs.h>
60#include <linux/seq_file.h>
61
ba89966c 62DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
1da177e4
LT		 63
64/* Grrr, addr_type already calculated by caller, but I don't want
65 * to add some silly "cookie" argument to this method just for that.
66 */
67static int udp_v6_get_port(struct sock *sk, unsigned short snum)
68{
69 struct sock *sk2;
70 struct hlist_node *node;
71
72 write_lock_bh(&udp_hash_lock);
73 if (snum == 0) {
74 int best_size_so_far, best, result, i;
75
76 if (udp_port_rover > sysctl_local_port_range[1] ||
77 udp_port_rover < sysctl_local_port_range[0])
78 udp_port_rover = sysctl_local_port_range[0];
79 best_size_so_far = 32767;
80 best = result = udp_port_rover;
81 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
82 int size;
83 struct hlist_head *list;
84
85 list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
86 if (hlist_empty(list)) {
87 if (result > sysctl_local_port_range[1])
88 result = sysctl_local_port_range[0] +
89 ((result - sysctl_local_port_range[0]) &
90 (UDP_HTABLE_SIZE - 1));
91 goto gotit;
92 }
93 size = 0;
94 sk_for_each(sk2, node, list)
95 if (++size >= best_size_so_far)
96 goto next;
97 best_size_so_far = size;
98 best = result;
99 next:;
100 }
101 result = best;
87bf9c97 102 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
1da177e4
LT		 103 if (result > sysctl_local_port_range[1])
104 result = sysctl_local_port_range[0]
105 + ((result - sysctl_local_port_range[0]) &
106 (UDP_HTABLE_SIZE - 1));
107 if (!udp_lport_inuse(result))
108 break;
109 }
87bf9c97
YH		 110 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
111 goto fail;
1da177e4
LT		 112gotit:
113 udp_port_rover = snum = result;
114 } else {
115 sk_for_each(sk2, node,
116 &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
117 if (inet_sk(sk2)->num == snum &&
118 sk2 != sk &&
119 (!sk2->sk_bound_dev_if ||
120 !sk->sk_bound_dev_if ||
121 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
122 (!sk2->sk_reuse || !sk->sk_reuse) &&
123 ipv6_rcv_saddr_equal(sk, sk2))
124 goto fail;
125 }
126 }
127
128 inet_sk(sk)->num = snum;
129 if (sk_unhashed(sk)) {
130 sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
131 sock_prot_inc_use(sk->sk_prot);
132 }
133 write_unlock_bh(&udp_hash_lock);
134 return 0;
135
136fail:
137 write_unlock_bh(&udp_hash_lock);
138 return 1;
139}
140
141static void udp_v6_hash(struct sock *sk)
142{
143 BUG();
144}
145
146static void udp_v6_unhash(struct sock *sk)
147{
148 write_lock_bh(&udp_hash_lock);
149 if (sk_del_node_init(sk)) {
150 inet_sk(sk)->num = 0;
151 sock_prot_dec_use(sk->sk_prot);
152 }
153 write_unlock_bh(&udp_hash_lock);
154}
155
156static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
157 struct in6_addr *daddr, u16 dport, int dif)
158{
159 struct sock *sk, *result = NULL;
160 struct hlist_node *node;
161 unsigned short hnum = ntohs(dport);
162 int badness = -1;
163
164 read_lock(&udp_hash_lock);
165 sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
166 struct inet_sock *inet = inet_sk(sk);
167
168 if (inet->num == hnum && sk->sk_family == PF_INET6) {
169 struct ipv6_pinfo *np = inet6_sk(sk);
170 int score = 0;
171 if (inet->dport) {
172 if (inet->dport != sport)
173 continue;
174 score++;
175 }
176 if (!ipv6_addr_any(&np->rcv_saddr)) {
177 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
178 continue;
179 score++;
180 }
181 if (!ipv6_addr_any(&np->daddr)) {
182 if (!ipv6_addr_equal(&np->daddr, saddr))
183 continue;
184 score++;
185 }
186 if (sk->sk_bound_dev_if) {
187 if (sk->sk_bound_dev_if != dif)
188 continue;
189 score++;
190 }
191 if(score == 4) {
192 result = sk;
193 break;
194 } else if(score > badness) {
195 result = sk;
196 badness = score;
197 }
198 }
199 }
200 if (result)
201 sock_hold(result);
202 read_unlock(&udp_hash_lock);
203 return result;
204}
205
206/*
207 *
208 */
209
210static void udpv6_close(struct sock *sk, long timeout)
211{
212 sk_common_release(sk);
213}
214
215/*
216 * This should be easy, if there is something there we
217 * return it, otherwise we block.
218 */
219
220static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
221 struct msghdr *msg, size_t len,
222 int noblock, int flags, int *addr_len)
223{
224 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct inet_sock *inet = inet_sk(sk);
226 struct sk_buff *skb;
227 size_t copied;
228 int err;
229
230 if (addr_len)
231 *addr_len=sizeof(struct sockaddr_in6);
232
233 if (flags & MSG_ERRQUEUE)
234 return ipv6_recv_error(sk, msg, len);
235
236try_again:
237 skb = skb_recv_datagram(sk, flags, noblock, &err);
238 if (!skb)
239 goto out;
240
241 copied = skb->len - sizeof(struct udphdr);
242 if (copied > len) {
243 copied = len;
244 msg->msg_flags |= MSG_TRUNC;
245 }
246
247 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
248 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
249 copied);
250 } else if (msg->msg_flags&MSG_TRUNC) {
fb286bb2 251 if (__skb_checksum_complete(skb))
1da177e4
LT		 252 goto csum_copy_err;
253 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
254 copied);
255 } else {
256 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
257 if (err == -EINVAL)
258 goto csum_copy_err;
259 }
260 if (err)
261 goto out_free;
262
263 sock_recv_timestamp(msg, sk, skb);
264
265 /* Copy the address. */
266 if (msg->msg_name) {
267 struct sockaddr_in6 *sin6;
268
269 sin6 = (struct sockaddr_in6 *) msg->msg_name;
270 sin6->sin6_family = AF_INET6;
271 sin6->sin6_port = skb->h.uh->source;
272 sin6->sin6_flowinfo = 0;
273 sin6->sin6_scope_id = 0;
274
275 if (skb->protocol == htons(ETH_P_IP))
276 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
277 htonl(0xffff), skb->nh.iph->saddr);
278 else {
279 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
280 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
281 sin6->sin6_scope_id = IP6CB(skb)->iif;
282 }
283
284 }
285 if (skb->protocol == htons(ETH_P_IP)) {
286 if (inet->cmsg_flags)
287 ip_cmsg_recv(msg, skb);
288 } else {
289 if (np->rxopt.all)
290 datagram_recv_ctl(sk, msg, skb);
291 }
292
293 err = copied;
294 if (flags & MSG_TRUNC)
295 err = skb->len - sizeof(struct udphdr);
296
297out_free:
298 skb_free_datagram(sk, skb);
299out:
300 return err;
301
302csum_copy_err:
3305b80c 303 skb_kill_datagram(sk, skb, flags);
1da177e4
LT		 304
305 if (flags & MSG_DONTWAIT) {
306 UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
307 return -EAGAIN;
308 }
309 goto try_again;
310}
311
312static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
313 int type, int code, int offset, __u32 info)
314{
315 struct ipv6_pinfo *np;
316 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
317 struct net_device *dev = skb->dev;
318 struct in6_addr *saddr = &hdr->saddr;
319 struct in6_addr *daddr = &hdr->daddr;
320 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
321 struct sock *sk;
322 int err;
323
324 sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
325
326 if (sk == NULL)
327 return;
328
329 np = inet6_sk(sk);
330
331 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
332 goto out;
333
334 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
335 goto out;
336
337 if (np->recverr)
338 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
339
340 sk->sk_err = err;
341 sk->sk_error_report(sk);
342out:
343 sock_put(sk);
344}
345
346static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
347{
348 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
349 kfree_skb(skb);
350 return -1;
351 }
352
fb286bb2
HX		 353 if (skb_checksum_complete(skb)) {
354 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
355 kfree_skb(skb);
356 return 0;
1da177e4
LT		 357 }
358
359 if (sock_queue_rcv_skb(sk,skb)<0) {
360 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
361 kfree_skb(skb);
362 return 0;
363 }
364 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
365 return 0;
366}
367
368static struct sock *udp_v6_mcast_next(struct sock *sk,
369 u16 loc_port, struct in6_addr *loc_addr,
370 u16 rmt_port, struct in6_addr *rmt_addr,
371 int dif)
372{
373 struct hlist_node *node;
374 struct sock *s = sk;
375 unsigned short num = ntohs(loc_port);
376
377 sk_for_each_from(s, node) {
378 struct inet_sock *inet = inet_sk(s);
379
380 if (inet->num == num && s->sk_family == PF_INET6) {
381 struct ipv6_pinfo *np = inet6_sk(s);
382 if (inet->dport) {
383 if (inet->dport != rmt_port)
384 continue;
385 }
386 if (!ipv6_addr_any(&np->daddr) &&
387 !ipv6_addr_equal(&np->daddr, rmt_addr))
388 continue;
389
390 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
391 continue;
392
393 if (!ipv6_addr_any(&np->rcv_saddr)) {
40796c5e
DS		 394 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
395 continue;
1da177e4
LT		 396 }
397 if(!inet6_mc_check(s, loc_addr, rmt_addr))
398 continue;
399 return s;
400 }
401 }
402 return NULL;
403}
404
405/*
406 * Note: called only from the BH handler context,
407 * so we don't need to lock the hashes.
408 */
409static void udpv6_mcast_deliver(struct udphdr *uh,
410 struct in6_addr *saddr, struct in6_addr *daddr,
411 struct sk_buff *skb)
412{
413 struct sock *sk, *sk2;
414 int dif;
415
416 read_lock(&udp_hash_lock);
417 sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
418 dif = skb->dev->ifindex;
419 sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
420 if (!sk) {
421 kfree_skb(skb);
422 goto out;
423 }
424
425 sk2 = sk;
426 while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
427 uh->source, saddr, dif))) {
428 struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
429 if (buff)
430 udpv6_queue_rcv_skb(sk2, buff);
431 }
432 udpv6_queue_rcv_skb(sk, skb);
433out:
434 read_unlock(&udp_hash_lock);
435}
436
951dbc8a 437static int udpv6_rcv(struct sk_buff **pskb)
1da177e4
LT		 438{
439 struct sk_buff *skb = *pskb;
440 struct sock *sk;
441 struct udphdr *uh;
442 struct net_device *dev = skb->dev;
443 struct in6_addr *saddr, *daddr;
444 u32 ulen = 0;
445
446 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
447 goto short_packet;
448
449 saddr = &skb->nh.ipv6h->saddr;
450 daddr = &skb->nh.ipv6h->daddr;
451 uh = skb->h.uh;
452
453 ulen = ntohs(uh->len);
454
455 /* Check for jumbo payload */
456 if (ulen == 0)
457 ulen = skb->len;
458
459 if (ulen > skb->len || ulen < sizeof(*uh))
460 goto short_packet;
461
462 if (uh->check == 0) {
463 /* RFC 2460 section 8.1 says that we SHOULD log
464 this error. Well, it is reasonable.
465 */
64ce2073 466 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
1da177e4
LT		 467 goto discard;
468 }
469
470 if (ulen < skb->len) {
42ca89c1 471 if (pskb_trim_rcsum(skb, ulen))
1da177e4
LT		 472 goto discard;
473 saddr = &skb->nh.ipv6h->saddr;
474 daddr = &skb->nh.ipv6h->daddr;
475 uh = skb->h.uh;
476 }
477
84fa7933 478 if (skb->ip_summed == CHECKSUM_COMPLETE &&
fb286bb2 479 !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum))
1da177e4 480 skb->ip_summed = CHECKSUM_UNNECESSARY;
fb286bb2 481
1da177e4
LT		 482 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
483 skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
484
485 /*
486 * Multicast receive code
487 */
488 if (ipv6_addr_is_multicast(daddr)) {
489 udpv6_mcast_deliver(uh, saddr, daddr, skb);
490 return 0;
491 }
492
493 /* Unicast */
494
495 /*
496 * check socket cache ... must talk to Alan about his plans
497 * for sock caches... i'll skip this for now.
498 */
499 sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
500
501 if (sk == NULL) {
502 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
503 goto discard;
504
fb286bb2 505 if (skb_checksum_complete(skb))
1da177e4
LT		 506 goto discard;
507 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
508
509 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
510
511 kfree_skb(skb);
512 return(0);
513 }
514
515 /* deliver */
516
517 udpv6_queue_rcv_skb(sk, skb);
518 sock_put(sk);
519 return(0);
520
521short_packet:
522 if (net_ratelimit())
523 printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
524
525discard:
526 UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
527 kfree_skb(skb);
528 return(0);
529}
530/*
531 * Throw away all pending data and cancel the corking. Socket is locked.
532 */
533static void udp_v6_flush_pending_frames(struct sock *sk)
534{
535 struct udp_sock *up = udp_sk(sk);
536
537 if (up->pending) {
538 up->len = 0;
539 up->pending = 0;
540 ip6_flush_pending_frames(sk);
541 }
542}
543
544/*
545 * Sending
546 */
547
548static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
549{
550 struct sk_buff *skb;
551 struct udphdr *uh;
552 struct inet_sock *inet = inet_sk(sk);
553 struct flowi *fl = &inet->cork.fl;
554 int err = 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 = skb->h.uh;
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 (sk->sk_no_check == UDP_CSUM_NOXMIT) {
570 skb->ip_summed = CHECKSUM_NONE;
571 goto send;
572 }
573
574 if (skb_queue_len(&sk->sk_write_queue) == 1) {
575 skb->csum = csum_partial((char *)uh,
576 sizeof(struct udphdr), skb->csum);
577 uh->check = csum_ipv6_magic(&fl->fl6_src,
578 &fl->fl6_dst,
579 up->len, fl->proto, skb->csum);
580 } else {
581 u32 tmp_csum = 0;
582
583 skb_queue_walk(&sk->sk_write_queue, skb) {
584 tmp_csum = csum_add(tmp_csum, skb->csum);
585 }
586 tmp_csum = csum_partial((char *)uh,
587 sizeof(struct udphdr), tmp_csum);
588 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
589 &fl->fl6_dst,
590 up->len, fl->proto, tmp_csum);
591 uh->check = tmp_csum;
592
593 }
594 if (uh->check == 0)
595 uh->check = -1;
596
597send:
598 err = ip6_push_pending_frames(sk);
599out:
600 up->len = 0;
601 up->pending = 0;
602 return err;
603}
604
605static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
606 struct msghdr *msg, size_t len)
607{
608 struct ipv6_txoptions opt_space;
609 struct udp_sock *up = udp_sk(sk);
610 struct inet_sock *inet = inet_sk(sk);
611 struct ipv6_pinfo *np = inet6_sk(sk);
612 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
613 struct in6_addr *daddr, *final_p = NULL, final;
614 struct ipv6_txoptions *opt = NULL;
615 struct ip6_flowlabel *flowlabel = NULL;
616 struct flowi *fl = &inet->cork.fl;
617 struct dst_entry *dst;
618 int addr_len = msg->msg_namelen;
619 int ulen = len;
620 int hlimit = -1;
41a1f8ea 621 int tclass = -1;
1da177e4
LT		 622 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
623 int err;
987905de 624 int connected = 0;
1da177e4
LT		 625
626 /* destination address check */
627 if (sin6) {
628 if (addr_len < offsetof(struct sockaddr, sa_data))
629 return -EINVAL;
630
631 switch (sin6->sin6_family) {
632 case AF_INET6:
633 if (addr_len < SIN6_LEN_RFC2133)
634 return -EINVAL;
635 daddr = &sin6->sin6_addr;
636 break;
637 case AF_INET:
638 goto do_udp_sendmsg;
639 case AF_UNSPEC:
640 msg->msg_name = sin6 = NULL;
641 msg->msg_namelen = addr_len = 0;
642 daddr = NULL;
643 break;
644 default:
645 return -EINVAL;
646 }
647 } else if (!up->pending) {
648 if (sk->sk_state != TCP_ESTABLISHED)
649 return -EDESTADDRREQ;
650 daddr = &np->daddr;
651 } else
652 daddr = NULL;
653
654 if (daddr) {
655 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
656 struct sockaddr_in sin;
657 sin.sin_family = AF_INET;
658 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
659 sin.sin_addr.s_addr = daddr->s6_addr32[3];
660 msg->msg_name = &sin;
661 msg->msg_namelen = sizeof(sin);
662do_udp_sendmsg:
663 if (__ipv6_only_sock(sk))
664 return -ENETUNREACH;
665 return udp_sendmsg(iocb, sk, msg, len);
666 }
667 }
668
669 if (up->pending == AF_INET)
670 return udp_sendmsg(iocb, sk, msg, len);
671
672 /* Rough check on arithmetic overflow,
673 better check is made in ip6_build_xmit
674 */
675 if (len > INT_MAX - sizeof(struct udphdr))
676 return -EMSGSIZE;
677
678 if (up->pending) {
679 /*
680 * There are pending frames.
681 * The socket lock must be held while it's corked.
682 */
683 lock_sock(sk);
684 if (likely(up->pending)) {
685 if (unlikely(up->pending != AF_INET6)) {
686 release_sock(sk);
687 return -EAFNOSUPPORT;
688 }
689 dst = NULL;
690 goto do_append_data;
691 }
692 release_sock(sk);
693 }
694 ulen += sizeof(struct udphdr);
695
696 memset(fl, 0, sizeof(*fl));
697
698 if (sin6) {
699 if (sin6->sin6_port == 0)
700 return -EINVAL;
701
702 fl->fl_ip_dport = sin6->sin6_port;
703 daddr = &sin6->sin6_addr;
704
705 if (np->sndflow) {
706 fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
707 if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
708 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
709 if (flowlabel == NULL)
710 return -EINVAL;
711 daddr = &flowlabel->dst;
712 }
713 }
714
715 /*
716 * Otherwise it will be difficult to maintain
717 * sk->sk_dst_cache.
718 */
719 if (sk->sk_state == TCP_ESTABLISHED &&
720 ipv6_addr_equal(daddr, &np->daddr))
721 daddr = &np->daddr;
722
723 if (addr_len >= sizeof(struct sockaddr_in6) &&
724 sin6->sin6_scope_id &&
725 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
726 fl->oif = sin6->sin6_scope_id;
727 } else {
728 if (sk->sk_state != TCP_ESTABLISHED)
729 return -EDESTADDRREQ;
730
731 fl->fl_ip_dport = inet->dport;
732 daddr = &np->daddr;
733 fl->fl6_flowlabel = np->flow_label;
987905de 734 connected = 1;
1da177e4
LT		 735 }
736
737 if (!fl->oif)
738 fl->oif = sk->sk_bound_dev_if;
739
740 if (msg->msg_controllen) {
741 opt = &opt_space;
742 memset(opt, 0, sizeof(struct ipv6_txoptions));
743 opt->tot_len = sizeof(*opt);
744
41a1f8ea 745 err = datagram_send_ctl(msg, fl, opt, &hlimit, &tclass);
1da177e4
LT		 746 if (err < 0) {
747 fl6_sock_release(flowlabel);
748 return err;
749 }
750 if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
751 flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
752 if (flowlabel == NULL)
753 return -EINVAL;
754 }
755 if (!(opt->opt_nflen|opt->opt_flen))
756 opt = NULL;
987905de 757 connected = 0;
1da177e4
LT		 758 }
759 if (opt == NULL)
760 opt = np->opt;
df9890c3
YH		 761 if (flowlabel)
762 opt = fl6_merge_options(&opt_space, flowlabel, opt);
763 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4
LT		 764
765 fl->proto = IPPROTO_UDP;
766 ipv6_addr_copy(&fl->fl6_dst, daddr);
767 if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
768 ipv6_addr_copy(&fl->fl6_src, &np->saddr);
769 fl->fl_ip_sport = inet->sport;
770
771 /* merge ip6_build_xmit from ip6_output */
772 if (opt && opt->srcrt) {
773 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
774 ipv6_addr_copy(&final, &fl->fl6_dst);
775 ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
776 final_p = &final;
987905de 777 connected = 0;
1da177e4
LT		 778 }
779
987905de 780 if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
1da177e4 781 fl->oif = np->mcast_oif;
987905de
MK		 782 connected = 0;
783 }
1da177e4 784
beb8d13b
VY		 785 security_sk_classify_flow(sk, fl);
786
497c615a 787 err = ip6_sk_dst_lookup(sk, &dst, fl);
1da177e4
LT		 788 if (err)
789 goto out;
790 if (final_p)
791 ipv6_addr_copy(&fl->fl6_dst, final_p);
792
e104411b 793 if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0)
1da177e4 794 goto out;
1da177e4
LT		 795
796 if (hlimit < 0) {
797 if (ipv6_addr_is_multicast(&fl->fl6_dst))
798 hlimit = np->mcast_hops;
799 else
800 hlimit = np->hop_limit;
801 if (hlimit < 0)
802 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
803 if (hlimit < 0)
804 hlimit = ipv6_get_hoplimit(dst->dev);
805 }
806
41a1f8ea
YH		 807 if (tclass < 0) {
808 tclass = np->tclass;
809 if (tclass < 0)
810 tclass = 0;
811 }
812
1da177e4
LT		 813 if (msg->msg_flags&MSG_CONFIRM)
814 goto do_confirm;
815back_from_confirm:
816
817 lock_sock(sk);
818 if (unlikely(up->pending)) {
819 /* The socket is already corked while preparing it. */
820 /* ... which is an evident application bug. --ANK */
821 release_sock(sk);
822
64ce2073 823 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 824 err = -EINVAL;
825 goto out;
826 }
827
828 up->pending = AF_INET6;
829
830do_append_data:
831 up->len += ulen;
41a1f8ea
YH		 832 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen,
833 sizeof(struct udphdr), hlimit, tclass, opt, fl,
834 (struct rt6_info*)dst,
835 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1da177e4
LT		 836 if (err)
837 udp_v6_flush_pending_frames(sk);
838 else if (!corkreq)
839 err = udp_v6_push_pending_frames(sk, up);
840
a5e7c210
DM		 841 if (dst) {
842 if (connected) {
843 ip6_dst_store(sk, dst,
844 ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
845 &np->daddr : NULL);
846 } else {
847 dst_release(dst);
848 }
849 }
850
1da177e4
LT		 851 if (err > 0)
852 err = np->recverr ? net_xmit_errno(err) : 0;
853 release_sock(sk);
854out:
855 fl6_sock_release(flowlabel);
856 if (!err) {
857 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
858 return len;
859 }
860 return err;
861
862do_confirm:
863 dst_confirm(dst);
864 if (!(msg->msg_flags&MSG_PROBE) || len)
865 goto back_from_confirm;
866 err = 0;
867 goto out;
868}
869
870static int udpv6_destroy_sock(struct sock *sk)
871{
872 lock_sock(sk);
873 udp_v6_flush_pending_frames(sk);
874 release_sock(sk);
875
876 inet6_destroy_sock(sk);
877
878 return 0;
879}
880
881/*
882 * Socket option code for UDP
883 */
3fdadf7d 884static int do_udpv6_setsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 885 char __user *optval, int optlen)
886{
887 struct udp_sock *up = udp_sk(sk);
888 int val;
889 int err = 0;
890
1da177e4
LT		 891 if(optlen<sizeof(int))
892 return -EINVAL;
893
894 if (get_user(val, (int __user *)optval))
895 return -EFAULT;
896
897 switch(optname) {
898 case UDP_CORK:
899 if (val != 0) {
900 up->corkflag = 1;
901 } else {
902 up->corkflag = 0;
903 lock_sock(sk);
904 udp_v6_push_pending_frames(sk, up);
905 release_sock(sk);
906 }
907 break;
908
909 case UDP_ENCAP:
910 switch (val) {
911 case 0:
912 up->encap_type = val;
913 break;
914 default:
915 err = -ENOPROTOOPT;
916 break;
917 }
918 break;
919
920 default:
921 err = -ENOPROTOOPT;
922 break;
923 };
924
925 return err;
926}
927
3fdadf7d
DM		 928static int udpv6_setsockopt(struct sock *sk, int level, int optname,
929 char __user *optval, int optlen)
930{
931 if (level != SOL_UDP)
932 return ipv6_setsockopt(sk, level, optname, optval, optlen);
933 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
934}
935
936#ifdef CONFIG_COMPAT
937static int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
543d9cfe 938 char __user *optval, int optlen)
3fdadf7d
DM		 939{
940 if (level != SOL_UDP)
543d9cfe
ACM		 941 return compat_ipv6_setsockopt(sk, level, optname,
942 optval, optlen);
3fdadf7d
DM		 943 return do_udpv6_setsockopt(sk, level, optname, optval, optlen);
944}
945#endif
946
947static int do_udpv6_getsockopt(struct sock *sk, int level, int optname,
1da177e4
LT		 948 char __user *optval, int __user *optlen)
949{
950 struct udp_sock *up = udp_sk(sk);
951 int val, len;
952
1da177e4
LT		 953 if(get_user(len,optlen))
954 return -EFAULT;
955
956 len = min_t(unsigned int, len, sizeof(int));
957
958 if(len < 0)
959 return -EINVAL;
960
961 switch(optname) {
962 case UDP_CORK:
963 val = up->corkflag;
964 break;
965
966 case UDP_ENCAP:
967 val = up->encap_type;
968 break;
969
970 default:
971 return -ENOPROTOOPT;
972 };
973
974 if(put_user(len, optlen))
975 return -EFAULT;
976 if(copy_to_user(optval, &val,len))
977 return -EFAULT;
978 return 0;
979}
980
3fdadf7d
DM		 981static int udpv6_getsockopt(struct sock *sk, int level, int optname,
982 char __user *optval, int __user *optlen)
983{
984 if (level != SOL_UDP)
985 return ipv6_getsockopt(sk, level, optname, optval, optlen);
986 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
987}
988
989#ifdef CONFIG_COMPAT
990static int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
543d9cfe 991 char __user *optval, int __user *optlen)
3fdadf7d
DM		 992{
993 if (level != SOL_UDP)
543d9cfe
ACM		 994 return compat_ipv6_getsockopt(sk, level, optname,
995 optval, optlen);
3fdadf7d
DM		 996 return do_udpv6_getsockopt(sk, level, optname, optval, optlen);
997}
998#endif
999
1da177e4
LT		 1000static struct inet6_protocol udpv6_protocol = {
1001 .handler = udpv6_rcv,
1002 .err_handler = udpv6_err,
1003 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1004};
1005
1006/* ------------------------------------------------------------------------ */
1007#ifdef CONFIG_PROC_FS
1008
1009static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1010{
1011 struct inet_sock *inet = inet_sk(sp);
1012 struct ipv6_pinfo *np = inet6_sk(sp);
1013 struct in6_addr *dest, *src;
1014 __u16 destp, srcp;
1015
1016 dest = &np->daddr;
1017 src = &np->rcv_saddr;
1018 destp = ntohs(inet->dport);
1019 srcp = ntohs(inet->sport);
1020 seq_printf(seq,
1021 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1022 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1023 bucket,
1024 src->s6_addr32[0], src->s6_addr32[1],
1025 src->s6_addr32[2], src->s6_addr32[3], srcp,
1026 dest->s6_addr32[0], dest->s6_addr32[1],
1027 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1028 sp->sk_state,
1029 atomic_read(&sp->sk_wmem_alloc),
1030 atomic_read(&sp->sk_rmem_alloc),
1031 0, 0L, 0,
1032 sock_i_uid(sp), 0,
1033 sock_i_ino(sp),
1034 atomic_read(&sp->sk_refcnt), sp);
1035}
1036
1037static int udp6_seq_show(struct seq_file *seq, void *v)
1038{
1039 if (v == SEQ_START_TOKEN)
1040 seq_printf(seq,
1041 " sl "
1042 "local_address "
1043 "remote_address "
1044 "st tx_queue rx_queue tr tm->when retrnsmt"
1045 " uid timeout inode\n");
1046 else
1047 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1048 return 0;
1049}
1050
1051static struct file_operations udp6_seq_fops;
1052static struct udp_seq_afinfo udp6_seq_afinfo = {
1053 .owner = THIS_MODULE,
1054 .name = "udp6",
1055 .family = AF_INET6,
1056 .seq_show = udp6_seq_show,
1057 .seq_fops = &udp6_seq_fops,
1058};
1059
1060int __init udp6_proc_init(void)
1061{
1062 return udp_proc_register(&udp6_seq_afinfo);
1063}
1064
1065void udp6_proc_exit(void) {
1066 udp_proc_unregister(&udp6_seq_afinfo);
1067}
1068#endif /* CONFIG_PROC_FS */
1069
1070/* ------------------------------------------------------------------------ */
1071
1072struct proto udpv6_prot = {
543d9cfe
ACM		 1073 .name = "UDPv6",
1074 .owner = THIS_MODULE,
1075 .close = udpv6_close,
1076 .connect = ip6_datagram_connect,
1077 .disconnect = udp_disconnect,
1078 .ioctl = udp_ioctl,
1079 .destroy = udpv6_destroy_sock,
1080 .setsockopt = udpv6_setsockopt,
1081 .getsockopt = udpv6_getsockopt,
1082 .sendmsg = udpv6_sendmsg,
1083 .recvmsg = udpv6_recvmsg,
1084 .backlog_rcv = udpv6_queue_rcv_skb,
1085 .hash = udp_v6_hash,
1086 .unhash = udp_v6_unhash,
1087 .get_port = udp_v6_get_port,
1088 .obj_size = sizeof(struct udp6_sock),
3fdadf7d 1089#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1090 .compat_setsockopt = compat_udpv6_setsockopt,
1091 .compat_getsockopt = compat_udpv6_getsockopt,
3fdadf7d 1092#endif
1da177e4
LT		 1093};
1094
1da177e4
LT		 1095static struct inet_protosw udpv6_protosw = {
1096 .type = SOCK_DGRAM,
1097 .protocol = IPPROTO_UDP,
1098 .prot = &udpv6_prot,
1099 .ops = &inet6_dgram_ops,
1100 .capability =-1,
1101 .no_check = UDP_CSUM_DEFAULT,
1102 .flags = INET_PROTOSW_PERMANENT,
1103};
1104
1105
1106void __init udpv6_init(void)
1107{
1108 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
1109 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
1110 inet6_register_protosw(&udpv6_protosw);
1111}
kernel source for telekom puls (alcatel/mediatek)