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[NET] IPV4: Fix whitespace errors.
[linux-block.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
1da177e4
LT		 41#include <net/ndisc.h>
42#include <net/protocol.h>
43#include <net/transp_v6.h>
44#include <net/ip6_route.h>
1da177e4 45#include <net/raw.h>
c752f073 46#include <net/tcp_states.h>
1da177e4
LT		 47#include <net/ip6_checksum.h>
48#include <net/xfrm.h>
49
50#include <linux/proc_fs.h>
51#include <linux/seq_file.h>
ba4e58ec 52#include "udp_impl.h"
1da177e4 53
ba89966c 54DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
1da177e4 55
25030a7f 56static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
1da177e4 57{
25030a7f 58 return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
1da177e4
LT		 59}
60
ba4e58ec
GR		 61static 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[])
1da177e4
LT		 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);
ba4e58ec 71 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
1da177e4
LT		 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
1da177e4
LT		 112/*
113 * This should be easy, if there is something there we
114 * return it, otherwise we block.
115 */
116
ba4e58ec 117int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 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;
ba4e58ec 125 int err, copy_only, is_udplite = IS_UDPLITE(sk);
1da177e4
LT		 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
133try_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
ba4e58ec
GR		 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))
1da177e4 151 goto csum_copy_err;
ba4e58ec
GR		 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 {
1da177e4
LT		 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
200out_free:
201 skb_free_datagram(sk, skb);
202out:
203 return err;
204
205csum_copy_err:
3305b80c 206 skb_kill_datagram(sk, skb, flags);
1da177e4
LT		 207
208 if (flags & MSG_DONTWAIT) {
ba4e58ec 209 UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
1da177e4
LT		 210 return -EAGAIN;
211 }
212 goto try_again;
213}
214
ba4e58ec
GR		 215void __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[] )
1da177e4
LT		 218{
219 struct ipv6_pinfo *np;
220 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
1da177e4
LT		 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
ba4e58ec
GR		 227 sk = __udp6_lib_lookup(daddr, uh->dest,
228 saddr, uh->source, inet6_iif(skb), udptable);
1da177e4
LT		 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);
245out:
246 sock_put(sk);
247}
248
ba4e58ec
GR		 249static __inline__ void udpv6_err(struct sk_buff *skb,
250 struct inet6_skb_parm *opt, int type,
8e5200f5 251 int code, int offset, __be32 info )
ba4e58ec
GR		 252{
253 return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
254}
255
256int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
1da177e4 257{
ba4e58ec 258 struct udp_sock *up = udp_sk(sk);
a18135eb
DM		 259 int rc;
260
ba4e58ec
GR		 261 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
262 goto drop;
1da177e4 263
ba4e58ec
GR		 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 }
1da177e4
LT		 281 }
282
ba4e58ec
GR		 283 if (udp_lib_checksum_complete(skb))
284 goto drop;
285
a18135eb
DM		 286 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
287 /* Note that an ENOMEM error is charged twice */
288 if (rc == -ENOMEM)
ba4e58ec
GR		 289 UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
290 goto drop;
1da177e4 291 }
ba4e58ec 292 UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
1da177e4 293 return 0;
ba4e58ec
GR		 294drop:
295 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
296 kfree_skb(skb);
297 return -1;
1da177e4
LT		 298}
299
300static struct sock *udp_v6_mcast_next(struct sock *sk,
e69a4adc
AV		 301 __be16 loc_port, struct in6_addr *loc_addr,
302 __be16 rmt_port, struct in6_addr *rmt_addr,
1da177e4
LT		 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)) {
40796c5e
DS		 326 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
327 continue;
1da177e4
LT		 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 */
ba4e58ec
GR		 341static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
342 struct in6_addr *daddr, struct hlist_head udptable[])
1da177e4
LT		 343{
344 struct sock *sk, *sk2;
ba4e58ec 345 const struct udphdr *uh = skb->h.uh;
1da177e4
LT		 346 int dif;
347
348 read_lock(&udp_hash_lock);
ba4e58ec 349 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
f2776ff0 350 dif = inet6_iif(skb);
1da177e4
LT		 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);
365out:
366 read_unlock(&udp_hash_lock);
ba4e58ec 367 return 0;
1da177e4
LT		 368}
369
ba4e58ec
GR		 370static 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)
868c86bc
AV		 386 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
387 &skb->nh.ipv6h->daddr,
7d9e9b3d 388 skb->len, IPPROTO_UDP,
868c86bc 389 0));
ba4e58ec
GR		 390
391 return (UDP_SKB_CB(skb)->partial_cov = 0);
392}
393
394int __udp6_lib_rcv(struct sk_buff **pskb, struct hlist_head udptable[],
395 int is_udplite)
1da177e4
LT		 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);
ba4e58ec
GR		 412 if (ulen > skb->len)
413 goto short_packet;
1da177e4 414
ba4e58ec 415 if(! is_udplite ) { /* UDP validates ulen. */
1da177e4 416
ba4e58ec
GR		 417 /* Check for jumbo payload */
418 if (ulen == 0)
419 ulen = skb->len;
1da177e4 420
ba4e58ec
GR		 421 if (ulen < sizeof(*uh))
422 goto short_packet;
1da177e4 423
ba4e58ec
GR		 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 }
1da177e4 431
ba4e58ec
GR		 432 if (udp6_csum_init(skb, uh))
433 goto discard;
fb286bb2 434
ba4e58ec
GR		 435 } else { /* UDP-Lite validates cscov. */
436 if (udplite6_csum_init(skb, uh))
437 goto discard;
438 }
1da177e4
LT		 439
440 /*
441 * Multicast receive code
442 */
ba4e58ec
GR		 443 if (ipv6_addr_is_multicast(daddr))
444 return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);
1da177e4
LT		 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 */
ba4e58ec
GR		 452 sk = __udp6_lib_lookup(saddr, uh->source,
453 daddr, uh->dest, inet6_iif(skb), udptable);
1da177e4
LT		 454
455 if (sk == NULL) {
456 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
457 goto discard;
458
ba4e58ec 459 if (udp_lib_checksum_complete(skb))
1da177e4 460 goto discard;
ba4e58ec 461 UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
1da177e4
LT		 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
475short_packet:
ba4e58ec
GR		 476 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
477 is_udplite? "-Lite" : "", ulen, skb->len);
1da177e4
LT		 478
479discard:
ba4e58ec 480 UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
1da177e4
LT		 481 kfree_skb(skb);
482 return(0);
483}
ba4e58ec
GR		 484
485static __inline__ int udpv6_rcv(struct sk_buff **pskb)
486{
487 return __udp6_lib_rcv(pskb, udp_hash, 0);
488}
489
1da177e4
LT		 490/*
491 * Throw away all pending data and cancel the corking. Socket is locked.
492 */
493static 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
4c0a6cb0 508static int udp_v6_push_pending_frames(struct sock *sk)
1da177e4
LT		 509{
510 struct sk_buff *skb;
511 struct udphdr *uh;
4c0a6cb0 512 struct udp_sock *up = udp_sk(sk);
1da177e4
LT		 513 struct inet_sock *inet = inet_sk(sk);
514 struct flowi *fl = &inet->cork.fl;
515 int err = 0;
868c86bc 516 __wsum csum = 0;
1da177e4
LT		 517
518 /* Grab the skbuff where UDP header space exists. */
519 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
520 goto out;
521
522 /*
523 * Create a UDP header
524 */
525 uh = skb->h.uh;
526 uh->source = fl->fl_ip_sport;
527 uh->dest = fl->fl_ip_dport;
528 uh->len = htons(up->len);
529 uh->check = 0;
530
ba4e58ec
GR		 531 if (up->pcflag)
532 csum = udplite_csum_outgoing(sk, skb);
533 else
534 csum = udp_csum_outgoing(sk, skb);
1da177e4 535
ba4e58ec
GR		 536 /* add protocol-dependent pseudo-header */
537 uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
538 up->len, fl->proto, csum );
1da177e4 539 if (uh->check == 0)
f6ab0288 540 uh->check = CSUM_MANGLED_0;
1da177e4 541
1da177e4
LT		 542 err = ip6_push_pending_frames(sk);
543out:
544 up->len = 0;
545 up->pending = 0;
546 return err;
547}
548
ba4e58ec 549int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 550 struct msghdr *msg, size_t len)
551{
552 struct ipv6_txoptions opt_space;
553 struct udp_sock *up = udp_sk(sk);
554 struct inet_sock *inet = inet_sk(sk);
555 struct ipv6_pinfo *np = inet6_sk(sk);
556 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
557 struct in6_addr *daddr, *final_p = NULL, final;
558 struct ipv6_txoptions *opt = NULL;
559 struct ip6_flowlabel *flowlabel = NULL;
132a55f3 560 struct flowi fl;
1da177e4
LT		 561 struct dst_entry *dst;
562 int addr_len = msg->msg_namelen;
563 int ulen = len;
564 int hlimit = -1;
41a1f8ea 565 int tclass = -1;
1da177e4
LT		 566 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
567 int err;
987905de 568 int connected = 0;
ba4e58ec
GR		 569 int is_udplite = up->pcflag;
570 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1da177e4
LT		 571
572 /* destination address check */
573 if (sin6) {
574 if (addr_len < offsetof(struct sockaddr, sa_data))
575 return -EINVAL;
576
577 switch (sin6->sin6_family) {
578 case AF_INET6:
579 if (addr_len < SIN6_LEN_RFC2133)
580 return -EINVAL;
581 daddr = &sin6->sin6_addr;
582 break;
583 case AF_INET:
584 goto do_udp_sendmsg;
585 case AF_UNSPEC:
586 msg->msg_name = sin6 = NULL;
587 msg->msg_namelen = addr_len = 0;
588 daddr = NULL;
589 break;
590 default:
591 return -EINVAL;
592 }
593 } else if (!up->pending) {
594 if (sk->sk_state != TCP_ESTABLISHED)
595 return -EDESTADDRREQ;
596 daddr = &np->daddr;
597 } else
598 daddr = NULL;
599
600 if (daddr) {
601 if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
602 struct sockaddr_in sin;
603 sin.sin_family = AF_INET;
604 sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
605 sin.sin_addr.s_addr = daddr->s6_addr32[3];
606 msg->msg_name = &sin;
607 msg->msg_namelen = sizeof(sin);
608do_udp_sendmsg:
609 if (__ipv6_only_sock(sk))
610 return -ENETUNREACH;
611 return udp_sendmsg(iocb, sk, msg, len);
612 }
613 }
614
615 if (up->pending == AF_INET)
616 return udp_sendmsg(iocb, sk, msg, len);
617
618 /* Rough check on arithmetic overflow,
619 better check is made in ip6_build_xmit
620 */
621 if (len > INT_MAX - sizeof(struct udphdr))
622 return -EMSGSIZE;
623
624 if (up->pending) {
625 /*
626 * There are pending frames.
627 * The socket lock must be held while it's corked.
628 */
629 lock_sock(sk);
630 if (likely(up->pending)) {
631 if (unlikely(up->pending != AF_INET6)) {
632 release_sock(sk);
633 return -EAFNOSUPPORT;
634 }
635 dst = NULL;
636 goto do_append_data;
637 }
638 release_sock(sk);
639 }
640 ulen += sizeof(struct udphdr);
641
132a55f3 642 memset(&fl, 0, sizeof(fl));
1da177e4
LT		 643
644 if (sin6) {
645 if (sin6->sin6_port == 0)
646 return -EINVAL;
647
132a55f3 648 fl.fl_ip_dport = sin6->sin6_port;
1da177e4
LT		 649 daddr = &sin6->sin6_addr;
650
651 if (np->sndflow) {
132a55f3
HX		 652 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
653 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
654 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1da177e4
LT		 655 if (flowlabel == NULL)
656 return -EINVAL;
657 daddr = &flowlabel->dst;
658 }
659 }
660
661 /*
662 * Otherwise it will be difficult to maintain
663 * sk->sk_dst_cache.
664 */
665 if (sk->sk_state == TCP_ESTABLISHED &&
666 ipv6_addr_equal(daddr, &np->daddr))
667 daddr = &np->daddr;
668
669 if (addr_len >= sizeof(struct sockaddr_in6) &&
670 sin6->sin6_scope_id &&
671 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
132a55f3 672 fl.oif = sin6->sin6_scope_id;
1da177e4
LT		 673 } else {
674 if (sk->sk_state != TCP_ESTABLISHED)
675 return -EDESTADDRREQ;
676
132a55f3 677 fl.fl_ip_dport = inet->dport;
1da177e4 678 daddr = &np->daddr;
132a55f3 679 fl.fl6_flowlabel = np->flow_label;
987905de 680 connected = 1;
1da177e4
LT		 681 }
682
132a55f3
HX		 683 if (!fl.oif)
684 fl.oif = sk->sk_bound_dev_if;
1da177e4
LT		 685
686 if (msg->msg_controllen) {
687 opt = &opt_space;
688 memset(opt, 0, sizeof(struct ipv6_txoptions));
689 opt->tot_len = sizeof(*opt);
690
132a55f3 691 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
1da177e4
LT		 692 if (err < 0) {
693 fl6_sock_release(flowlabel);
694 return err;
695 }
132a55f3
HX		 696 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
697 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
1da177e4
LT		 698 if (flowlabel == NULL)
699 return -EINVAL;
700 }
701 if (!(opt->opt_nflen|opt->opt_flen))
702 opt = NULL;
987905de 703 connected = 0;
1da177e4
LT		 704 }
705 if (opt == NULL)
706 opt = np->opt;
df9890c3
YH		 707 if (flowlabel)
708 opt = fl6_merge_options(&opt_space, flowlabel, opt);
709 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4 710
ba4e58ec 711 fl.proto = sk->sk_protocol;
132a55f3
HX		 712 ipv6_addr_copy(&fl.fl6_dst, daddr);
713 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
714 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
715 fl.fl_ip_sport = inet->sport;
1da177e4
LT		 716
717 /* merge ip6_build_xmit from ip6_output */
718 if (opt && opt->srcrt) {
719 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
132a55f3
HX		 720 ipv6_addr_copy(&final, &fl.fl6_dst);
721 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1da177e4 722 final_p = &final;
987905de 723 connected = 0;
1da177e4
LT		 724 }
725
132a55f3
HX		 726 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
727 fl.oif = np->mcast_oif;
987905de
MK		 728 connected = 0;
729 }
1da177e4 730
132a55f3 731 security_sk_classify_flow(sk, &fl);
beb8d13b 732
132a55f3 733 err = ip6_sk_dst_lookup(sk, &dst, &fl);
1da177e4
LT		 734 if (err)
735 goto out;
736 if (final_p)
132a55f3 737 ipv6_addr_copy(&fl.fl6_dst, final_p);
1da177e4 738
8eb9086f 739 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
1da177e4 740 goto out;
1da177e4
LT		 741
742 if (hlimit < 0) {
132a55f3 743 if (ipv6_addr_is_multicast(&fl.fl6_dst))
1da177e4
LT		 744 hlimit = np->mcast_hops;
745 else
746 hlimit = np->hop_limit;
747 if (hlimit < 0)
748 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
749 if (hlimit < 0)
750 hlimit = ipv6_get_hoplimit(dst->dev);
751 }
752
41a1f8ea
YH		 753 if (tclass < 0) {
754 tclass = np->tclass;
755 if (tclass < 0)
756 tclass = 0;
757 }
758
1da177e4
LT		 759 if (msg->msg_flags&MSG_CONFIRM)
760 goto do_confirm;
761back_from_confirm:
762
763 lock_sock(sk);
764 if (unlikely(up->pending)) {
765 /* The socket is already corked while preparing it. */
766 /* ... which is an evident application bug. --ANK */
767 release_sock(sk);
768
64ce2073 769 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 770 err = -EINVAL;
771 goto out;
772 }
773
774 up->pending = AF_INET6;
775
776do_append_data:
777 up->len += ulen;
ba4e58ec
GR		 778 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
779 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
132a55f3 780 sizeof(struct udphdr), hlimit, tclass, opt, &fl,
41a1f8ea
YH		 781 (struct rt6_info*)dst,
782 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1da177e4
LT		 783 if (err)
784 udp_v6_flush_pending_frames(sk);
785 else if (!corkreq)
4c0a6cb0 786 err = udp_v6_push_pending_frames(sk);
1e0c14f4
HX		 787 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
788 up->pending = 0;
1da177e4 789
a5e7c210
DM		 790 if (dst) {
791 if (connected) {
792 ip6_dst_store(sk, dst,
132a55f3 793 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
8e1ef0a9
YH		 794 &np->daddr : NULL,
795#ifdef CONFIG_IPV6_SUBTREES
132a55f3 796 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
8e1ef0a9
YH		 797 &np->saddr :
798#endif
799 NULL);
a5e7c210
DM		 800 } else {
801 dst_release(dst);
802 }
803 }
804
1da177e4
LT		 805 if (err > 0)
806 err = np->recverr ? net_xmit_errno(err) : 0;
807 release_sock(sk);
808out:
809 fl6_sock_release(flowlabel);
810 if (!err) {
ba4e58ec 811 UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
1da177e4
LT		 812 return len;
813 }
a18135eb
DM		 814 /*
815 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
816 * ENOBUFS might not be good (it's not tunable per se), but otherwise
817 * we don't have a good statistic (IpOutDiscards but it can be too many
818 * things). We could add another new stat but at least for now that
819 * seems like overkill.
820 */
821 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
ba4e58ec 822 UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
a18135eb 823 }
1da177e4
LT		 824 return err;
825
826do_confirm:
827 dst_confirm(dst);
828 if (!(msg->msg_flags&MSG_PROBE) || len)
829 goto back_from_confirm;
830 err = 0;
831 goto out;
832}
833
ba4e58ec 834int udpv6_destroy_sock(struct sock *sk)
1da177e4
LT		 835{
836 lock_sock(sk);
837 udp_v6_flush_pending_frames(sk);
838 release_sock(sk);
839
840 inet6_destroy_sock(sk);
841
842 return 0;
843}
844
845/*
846 * Socket option code for UDP
847 */
ba4e58ec
GR		 848int udpv6_setsockopt(struct sock *sk, int level, int optname,
849 char __user *optval, int optlen)
3fdadf7d 850{
ba4e58ec 851 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 852 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
853 udp_v6_push_pending_frames);
ba4e58ec 854 return ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 855}
856
857#ifdef CONFIG_COMPAT
ba4e58ec
GR		 858int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
859 char __user *optval, int optlen)
3fdadf7d 860{
ba4e58ec 861 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 862 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
863 udp_v6_push_pending_frames);
ba4e58ec 864 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 865}
866#endif
867
ba4e58ec
GR		 868int udpv6_getsockopt(struct sock *sk, int level, int optname,
869 char __user *optval, int __user *optlen)
3fdadf7d 870{
ba4e58ec 871 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 872 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 873 return ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 874}
875
876#ifdef CONFIG_COMPAT
ba4e58ec
GR		 877int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
878 char __user *optval, int __user *optlen)
3fdadf7d 879{
ba4e58ec 880 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 881 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 882 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 883}
884#endif
885
1da177e4
LT		 886static struct inet6_protocol udpv6_protocol = {
887 .handler = udpv6_rcv,
888 .err_handler = udpv6_err,
889 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
890};
891
892/* ------------------------------------------------------------------------ */
893#ifdef CONFIG_PROC_FS
894
895static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
896{
897 struct inet_sock *inet = inet_sk(sp);
898 struct ipv6_pinfo *np = inet6_sk(sp);
899 struct in6_addr *dest, *src;
900 __u16 destp, srcp;
901
902 dest = &np->daddr;
903 src = &np->rcv_saddr;
904 destp = ntohs(inet->dport);
905 srcp = ntohs(inet->sport);
906 seq_printf(seq,
907 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
908 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
909 bucket,
910 src->s6_addr32[0], src->s6_addr32[1],
911 src->s6_addr32[2], src->s6_addr32[3], srcp,
912 dest->s6_addr32[0], dest->s6_addr32[1],
913 dest->s6_addr32[2], dest->s6_addr32[3], destp,
914 sp->sk_state,
915 atomic_read(&sp->sk_wmem_alloc),
916 atomic_read(&sp->sk_rmem_alloc),
917 0, 0L, 0,
918 sock_i_uid(sp), 0,
919 sock_i_ino(sp),
920 atomic_read(&sp->sk_refcnt), sp);
921}
922
ba4e58ec 923int udp6_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 924{
925 if (v == SEQ_START_TOKEN)
926 seq_printf(seq,
927 " sl "
928 "local_address "
929 "remote_address "
930 "st tx_queue rx_queue tr tm->when retrnsmt"
931 " uid timeout inode\n");
932 else
933 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
934 return 0;
935}
936
937static struct file_operations udp6_seq_fops;
938static struct udp_seq_afinfo udp6_seq_afinfo = {
939 .owner = THIS_MODULE,
940 .name = "udp6",
941 .family = AF_INET6,
ba4e58ec 942 .hashtable = udp_hash,
1da177e4
LT		 943 .seq_show = udp6_seq_show,
944 .seq_fops = &udp6_seq_fops,
945};
946
947int __init udp6_proc_init(void)
948{
949 return udp_proc_register(&udp6_seq_afinfo);
950}
951
952void udp6_proc_exit(void) {
953 udp_proc_unregister(&udp6_seq_afinfo);
954}
955#endif /* CONFIG_PROC_FS */
956
957/* ------------------------------------------------------------------------ */
958
959struct proto udpv6_prot = {
543d9cfe
ACM		 960 .name = "UDPv6",
961 .owner = THIS_MODULE,
ba4e58ec 962 .close = udp_lib_close,
543d9cfe
ACM		 963 .connect = ip6_datagram_connect,
964 .disconnect = udp_disconnect,
965 .ioctl = udp_ioctl,
966 .destroy = udpv6_destroy_sock,
967 .setsockopt = udpv6_setsockopt,
968 .getsockopt = udpv6_getsockopt,
969 .sendmsg = udpv6_sendmsg,
970 .recvmsg = udpv6_recvmsg,
971 .backlog_rcv = udpv6_queue_rcv_skb,
ba4e58ec
GR		 972 .hash = udp_lib_hash,
973 .unhash = udp_lib_unhash,
543d9cfe
ACM		 974 .get_port = udp_v6_get_port,
975 .obj_size = sizeof(struct udp6_sock),
3fdadf7d 976#ifdef CONFIG_COMPAT
543d9cfe
ACM		 977 .compat_setsockopt = compat_udpv6_setsockopt,
978 .compat_getsockopt = compat_udpv6_getsockopt,
3fdadf7d 979#endif
1da177e4
LT		 980};
981
1da177e4
LT		 982static struct inet_protosw udpv6_protosw = {
983 .type = SOCK_DGRAM,
984 .protocol = IPPROTO_UDP,
985 .prot = &udpv6_prot,
986 .ops = &inet6_dgram_ops,
987 .capability =-1,
988 .no_check = UDP_CSUM_DEFAULT,
989 .flags = INET_PROTOSW_PERMANENT,
990};
991
992
993void __init udpv6_init(void)
994{
995 if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
996 printk(KERN_ERR "udpv6_init: Could not register protocol\n");
997 inet6_register_protosw(&udpv6_protosw);
998}
Linux 6.x block layer and io_uring tree(s)