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ipv6: Change skb->data before using icmpv6_notify() to propagate redirect
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include <trace/events/skb.h>
52 #include "udp_impl.h"
53
54 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
55 {
56 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
57 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
58 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
59 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
60 int sk_ipv6only = ipv6_only_sock(sk);
61 int sk2_ipv6only = inet_v6_ipv6only(sk2);
62 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
63 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
64
65 /* if both are mapped, treat as IPv4 */
66 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
67 return (!sk2_ipv6only &&
68 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
69 sk1_rcv_saddr == sk2_rcv_saddr));
70
71 if (addr_type2 == IPV6_ADDR_ANY &&
72 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
73 return 1;
74
75 if (addr_type == IPV6_ADDR_ANY &&
76 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
77 return 1;
78
79 if (sk2_rcv_saddr6 &&
80 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
81 return 1;
82
83 return 0;
84 }
85
86 static unsigned int udp6_portaddr_hash(struct net *net,
87 const struct in6_addr *addr6,
88 unsigned int port)
89 {
90 unsigned int hash, mix = net_hash_mix(net);
91
92 if (ipv6_addr_any(addr6))
93 hash = jhash_1word(0, mix);
94 else if (ipv6_addr_v4mapped(addr6))
95 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
96 else
97 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
98
99 return hash ^ port;
100 }
101
102
103 int udp_v6_get_port(struct sock *sk, unsigned short snum)
104 {
105 unsigned int hash2_nulladdr =
106 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
107 unsigned int hash2_partial =
108 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
109
110 /* precompute partial secondary hash */
111 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
112 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
113 }
114
115 static void udp_v6_rehash(struct sock *sk)
116 {
117 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
118 &inet6_sk(sk)->rcv_saddr,
119 inet_sk(sk)->inet_num);
120
121 udp_lib_rehash(sk, new_hash);
122 }
123
124 static inline int compute_score(struct sock *sk, struct net *net,
125 unsigned short hnum,
126 const struct in6_addr *saddr, __be16 sport,
127 const struct in6_addr *daddr, __be16 dport,
128 int dif)
129 {
130 int score = -1;
131
132 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
133 sk->sk_family == PF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
136
137 score = 0;
138 if (inet->inet_dport) {
139 if (inet->inet_dport != sport)
140 return -1;
141 score++;
142 }
143 if (!ipv6_addr_any(&np->rcv_saddr)) {
144 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
145 return -1;
146 score++;
147 }
148 if (!ipv6_addr_any(&np->daddr)) {
149 if (!ipv6_addr_equal(&np->daddr, saddr))
150 return -1;
151 score++;
152 }
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158 }
159 return score;
160 }
161
162 #define SCORE2_MAX (1 + 1 + 1)
163 static inline int compute_score2(struct sock *sk, struct net *net,
164 const struct in6_addr *saddr, __be16 sport,
165 const struct in6_addr *daddr, unsigned short hnum,
166 int dif)
167 {
168 int score = -1;
169
170 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
171 sk->sk_family == PF_INET6) {
172 struct ipv6_pinfo *np = inet6_sk(sk);
173 struct inet_sock *inet = inet_sk(sk);
174
175 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
176 return -1;
177 score = 0;
178 if (inet->inet_dport) {
179 if (inet->inet_dport != sport)
180 return -1;
181 score++;
182 }
183 if (!ipv6_addr_any(&np->daddr)) {
184 if (!ipv6_addr_equal(&np->daddr, saddr))
185 return -1;
186 score++;
187 }
188 if (sk->sk_bound_dev_if) {
189 if (sk->sk_bound_dev_if != dif)
190 return -1;
191 score++;
192 }
193 }
194 return score;
195 }
196
197
198 /* called with read_rcu_lock() */
199 static struct sock *udp6_lib_lookup2(struct net *net,
200 const struct in6_addr *saddr, __be16 sport,
201 const struct in6_addr *daddr, unsigned int hnum, int dif,
202 struct udp_hslot *hslot2, unsigned int slot2)
203 {
204 struct sock *sk, *result;
205 struct hlist_nulls_node *node;
206 int score, badness;
207
208 begin:
209 result = NULL;
210 badness = -1;
211 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
212 score = compute_score2(sk, net, saddr, sport,
213 daddr, hnum, dif);
214 if (score > badness) {
215 result = sk;
216 badness = score;
217 if (score == SCORE2_MAX)
218 goto exact_match;
219 }
220 }
221 /*
222 * if the nulls value we got at the end of this lookup is
223 * not the expected one, we must restart lookup.
224 * We probably met an item that was moved to another chain.
225 */
226 if (get_nulls_value(node) != slot2)
227 goto begin;
228
229 if (result) {
230 exact_match:
231 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
232 result = NULL;
233 else if (unlikely(compute_score2(result, net, saddr, sport,
234 daddr, hnum, dif) < badness)) {
235 sock_put(result);
236 goto begin;
237 }
238 }
239 return result;
240 }
241
242 struct sock *__udp6_lib_lookup(struct net *net,
243 const struct in6_addr *saddr, __be16 sport,
244 const struct in6_addr *daddr, __be16 dport,
245 int dif, struct udp_table *udptable)
246 {
247 struct sock *sk, *result;
248 struct hlist_nulls_node *node;
249 unsigned short hnum = ntohs(dport);
250 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
251 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
252 int score, badness;
253
254 rcu_read_lock();
255 if (hslot->count > 10) {
256 hash2 = udp6_portaddr_hash(net, daddr, hnum);
257 slot2 = hash2 & udptable->mask;
258 hslot2 = &udptable->hash2[slot2];
259 if (hslot->count < hslot2->count)
260 goto begin;
261
262 result = udp6_lib_lookup2(net, saddr, sport,
263 daddr, hnum, dif,
264 hslot2, slot2);
265 if (!result) {
266 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
267 slot2 = hash2 & udptable->mask;
268 hslot2 = &udptable->hash2[slot2];
269 if (hslot->count < hslot2->count)
270 goto begin;
271
272 result = udp6_lib_lookup2(net, saddr, sport,
273 &in6addr_any, hnum, dif,
274 hslot2, slot2);
275 }
276 rcu_read_unlock();
277 return result;
278 }
279 begin:
280 result = NULL;
281 badness = -1;
282 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
283 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
284 if (score > badness) {
285 result = sk;
286 badness = score;
287 }
288 }
289 /*
290 * if the nulls value we got at the end of this lookup is
291 * not the expected one, we must restart lookup.
292 * We probably met an item that was moved to another chain.
293 */
294 if (get_nulls_value(node) != slot)
295 goto begin;
296
297 if (result) {
298 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
299 result = NULL;
300 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
301 daddr, dport, dif) < badness)) {
302 sock_put(result);
303 goto begin;
304 }
305 }
306 rcu_read_unlock();
307 return result;
308 }
309 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
310
311 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
312 __be16 sport, __be16 dport,
313 struct udp_table *udptable)
314 {
315 struct sock *sk;
316 const struct ipv6hdr *iph = ipv6_hdr(skb);
317
318 if (unlikely(sk = skb_steal_sock(skb)))
319 return sk;
320 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
321 &iph->daddr, dport, inet6_iif(skb),
322 udptable);
323 }
324
325 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
326 const struct in6_addr *daddr, __be16 dport, int dif)
327 {
328 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
329 }
330 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
331
332
333 /*
334 * This should be easy, if there is something there we
335 * return it, otherwise we block.
336 */
337
338 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
339 struct msghdr *msg, size_t len,
340 int noblock, int flags, int *addr_len)
341 {
342 struct ipv6_pinfo *np = inet6_sk(sk);
343 struct inet_sock *inet = inet_sk(sk);
344 struct sk_buff *skb;
345 unsigned int ulen, copied;
346 int peeked, off = 0;
347 int err;
348 int is_udplite = IS_UDPLITE(sk);
349 int is_udp4;
350 bool slow;
351
352 if (addr_len)
353 *addr_len = sizeof(struct sockaddr_in6);
354
355 if (flags & MSG_ERRQUEUE)
356 return ipv6_recv_error(sk, msg, len);
357
358 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
359 return ipv6_recv_rxpmtu(sk, msg, len);
360
361 try_again:
362 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
363 &peeked, &off, &err);
364 if (!skb)
365 goto out;
366
367 ulen = skb->len - sizeof(struct udphdr);
368 copied = len;
369 if (copied > ulen)
370 copied = ulen;
371 else if (copied < ulen)
372 msg->msg_flags |= MSG_TRUNC;
373
374 is_udp4 = (skb->protocol == htons(ETH_P_IP));
375
376 /*
377 * If checksum is needed at all, try to do it while copying the
378 * data. If the data is truncated, or if we only want a partial
379 * coverage checksum (UDP-Lite), do it before the copy.
380 */
381
382 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
383 if (udp_lib_checksum_complete(skb))
384 goto csum_copy_err;
385 }
386
387 if (skb_csum_unnecessary(skb))
388 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
389 msg->msg_iov, copied);
390 else {
391 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
392 if (err == -EINVAL)
393 goto csum_copy_err;
394 }
395 if (unlikely(err)) {
396 trace_kfree_skb(skb, udpv6_recvmsg);
397 if (!peeked) {
398 atomic_inc(&sk->sk_drops);
399 if (is_udp4)
400 UDP_INC_STATS_USER(sock_net(sk),
401 UDP_MIB_INERRORS,
402 is_udplite);
403 else
404 UDP6_INC_STATS_USER(sock_net(sk),
405 UDP_MIB_INERRORS,
406 is_udplite);
407 }
408 goto out_free;
409 }
410 if (!peeked) {
411 if (is_udp4)
412 UDP_INC_STATS_USER(sock_net(sk),
413 UDP_MIB_INDATAGRAMS, is_udplite);
414 else
415 UDP6_INC_STATS_USER(sock_net(sk),
416 UDP_MIB_INDATAGRAMS, is_udplite);
417 }
418
419 sock_recv_ts_and_drops(msg, sk, skb);
420
421 /* Copy the address. */
422 if (msg->msg_name) {
423 struct sockaddr_in6 *sin6;
424
425 sin6 = (struct sockaddr_in6 *) msg->msg_name;
426 sin6->sin6_family = AF_INET6;
427 sin6->sin6_port = udp_hdr(skb)->source;
428 sin6->sin6_flowinfo = 0;
429 sin6->sin6_scope_id = 0;
430
431 if (is_udp4)
432 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
433 &sin6->sin6_addr);
434 else {
435 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
436 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
437 sin6->sin6_scope_id = IP6CB(skb)->iif;
438 }
439
440 }
441 if (is_udp4) {
442 if (inet->cmsg_flags)
443 ip_cmsg_recv(msg, skb);
444 } else {
445 if (np->rxopt.all)
446 datagram_recv_ctl(sk, msg, skb);
447 }
448
449 err = copied;
450 if (flags & MSG_TRUNC)
451 err = ulen;
452
453 out_free:
454 skb_free_datagram_locked(sk, skb);
455 out:
456 return err;
457
458 csum_copy_err:
459 slow = lock_sock_fast(sk);
460 if (!skb_kill_datagram(sk, skb, flags)) {
461 if (is_udp4)
462 UDP_INC_STATS_USER(sock_net(sk),
463 UDP_MIB_INERRORS, is_udplite);
464 else
465 UDP6_INC_STATS_USER(sock_net(sk),
466 UDP_MIB_INERRORS, is_udplite);
467 }
468 unlock_sock_fast(sk, slow);
469
470 if (noblock)
471 return -EAGAIN;
472
473 /* starting over for a new packet */
474 msg->msg_flags &= ~MSG_TRUNC;
475 goto try_again;
476 }
477
478 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
479 u8 type, u8 code, int offset, __be32 info,
480 struct udp_table *udptable)
481 {
482 struct ipv6_pinfo *np;
483 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
484 const struct in6_addr *saddr = &hdr->saddr;
485 const struct in6_addr *daddr = &hdr->daddr;
486 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
487 struct sock *sk;
488 int err;
489
490 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
491 saddr, uh->source, inet6_iif(skb), udptable);
492 if (sk == NULL)
493 return;
494
495 if (type == ICMPV6_PKT_TOOBIG)
496 ip6_sk_update_pmtu(skb, sk, info);
497 if (type == NDISC_REDIRECT)
498 ip6_sk_redirect(skb, sk);
499
500 np = inet6_sk(sk);
501
502 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
503 goto out;
504
505 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
506 goto out;
507
508 if (np->recverr)
509 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
510
511 sk->sk_err = err;
512 sk->sk_error_report(sk);
513 out:
514 sock_put(sk);
515 }
516
517 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
518 {
519 int rc;
520
521 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
522 sock_rps_save_rxhash(sk, skb);
523
524 rc = sock_queue_rcv_skb(sk, skb);
525 if (rc < 0) {
526 int is_udplite = IS_UDPLITE(sk);
527
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
530 UDP6_INC_STATS_BH(sock_net(sk),
531 UDP_MIB_RCVBUFERRORS, is_udplite);
532 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
533 kfree_skb(skb);
534 return -1;
535 }
536 return 0;
537 }
538
539 static __inline__ void udpv6_err(struct sk_buff *skb,
540 struct inet6_skb_parm *opt, u8 type,
541 u8 code, int offset, __be32 info )
542 {
543 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
544 }
545
546 static struct static_key udpv6_encap_needed __read_mostly;
547 void udpv6_encap_enable(void)
548 {
549 if (!static_key_enabled(&udpv6_encap_needed))
550 static_key_slow_inc(&udpv6_encap_needed);
551 }
552 EXPORT_SYMBOL(udpv6_encap_enable);
553
554 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
555 {
556 struct udp_sock *up = udp_sk(sk);
557 int rc;
558 int is_udplite = IS_UDPLITE(sk);
559
560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
561 goto drop;
562
563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
565
566 /*
567 * This is an encapsulation socket so pass the skb to
568 * the socket's udp_encap_rcv() hook. Otherwise, just
569 * fall through and pass this up the UDP socket.
570 * up->encap_rcv() returns the following value:
571 * =0 if skb was successfully passed to the encap
572 * handler or was discarded by it.
573 * >0 if skb should be passed on to UDP.
574 * <0 if skb should be resubmitted as proto -N
575 */
576
577 /* if we're overly short, let UDP handle it */
578 encap_rcv = ACCESS_ONCE(up->encap_rcv);
579 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
580 int ret;
581
582 ret = encap_rcv(sk, skb);
583 if (ret <= 0) {
584 UDP_INC_STATS_BH(sock_net(sk),
585 UDP_MIB_INDATAGRAMS,
586 is_udplite);
587 return -ret;
588 }
589 }
590
591 /* FALLTHROUGH -- it's a UDP Packet */
592 }
593
594 /*
595 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
596 */
597 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
598
599 if (up->pcrlen == 0) { /* full coverage was set */
600 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
601 " %d while full coverage %d requested\n",
602 UDP_SKB_CB(skb)->cscov, skb->len);
603 goto drop;
604 }
605 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
606 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
607 "too small, need min %d\n",
608 UDP_SKB_CB(skb)->cscov, up->pcrlen);
609 goto drop;
610 }
611 }
612
613 if (rcu_access_pointer(sk->sk_filter)) {
614 if (udp_lib_checksum_complete(skb))
615 goto drop;
616 }
617
618 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
619 goto drop;
620
621 skb_dst_drop(skb);
622
623 bh_lock_sock(sk);
624 rc = 0;
625 if (!sock_owned_by_user(sk))
626 rc = __udpv6_queue_rcv_skb(sk, skb);
627 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
628 bh_unlock_sock(sk);
629 goto drop;
630 }
631 bh_unlock_sock(sk);
632
633 return rc;
634 drop:
635 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
636 atomic_inc(&sk->sk_drops);
637 kfree_skb(skb);
638 return -1;
639 }
640
641 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
642 __be16 loc_port, const struct in6_addr *loc_addr,
643 __be16 rmt_port, const struct in6_addr *rmt_addr,
644 int dif)
645 {
646 struct hlist_nulls_node *node;
647 struct sock *s = sk;
648 unsigned short num = ntohs(loc_port);
649
650 sk_nulls_for_each_from(s, node) {
651 struct inet_sock *inet = inet_sk(s);
652
653 if (!net_eq(sock_net(s), net))
654 continue;
655
656 if (udp_sk(s)->udp_port_hash == num &&
657 s->sk_family == PF_INET6) {
658 struct ipv6_pinfo *np = inet6_sk(s);
659 if (inet->inet_dport) {
660 if (inet->inet_dport != rmt_port)
661 continue;
662 }
663 if (!ipv6_addr_any(&np->daddr) &&
664 !ipv6_addr_equal(&np->daddr, rmt_addr))
665 continue;
666
667 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
668 continue;
669
670 if (!ipv6_addr_any(&np->rcv_saddr)) {
671 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
672 continue;
673 }
674 if (!inet6_mc_check(s, loc_addr, rmt_addr))
675 continue;
676 return s;
677 }
678 }
679 return NULL;
680 }
681
682 static void flush_stack(struct sock **stack, unsigned int count,
683 struct sk_buff *skb, unsigned int final)
684 {
685 struct sk_buff *skb1 = NULL;
686 struct sock *sk;
687 unsigned int i;
688
689 for (i = 0; i < count; i++) {
690 sk = stack[i];
691 if (likely(skb1 == NULL))
692 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
693 if (!skb1) {
694 atomic_inc(&sk->sk_drops);
695 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
696 IS_UDPLITE(sk));
697 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
698 IS_UDPLITE(sk));
699 }
700
701 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
702 skb1 = NULL;
703 }
704 if (unlikely(skb1))
705 kfree_skb(skb1);
706 }
707 /*
708 * Note: called only from the BH handler context,
709 * so we don't need to lock the hashes.
710 */
711 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
712 const struct in6_addr *saddr, const struct in6_addr *daddr,
713 struct udp_table *udptable)
714 {
715 struct sock *sk, *stack[256 / sizeof(struct sock *)];
716 const struct udphdr *uh = udp_hdr(skb);
717 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
718 int dif;
719 unsigned int i, count = 0;
720
721 spin_lock(&hslot->lock);
722 sk = sk_nulls_head(&hslot->head);
723 dif = inet6_iif(skb);
724 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
725 while (sk) {
726 stack[count++] = sk;
727 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
728 uh->source, saddr, dif);
729 if (unlikely(count == ARRAY_SIZE(stack))) {
730 if (!sk)
731 break;
732 flush_stack(stack, count, skb, ~0);
733 count = 0;
734 }
735 }
736 /*
737 * before releasing the lock, we must take reference on sockets
738 */
739 for (i = 0; i < count; i++)
740 sock_hold(stack[i]);
741
742 spin_unlock(&hslot->lock);
743
744 if (count) {
745 flush_stack(stack, count, skb, count - 1);
746
747 for (i = 0; i < count; i++)
748 sock_put(stack[i]);
749 } else {
750 kfree_skb(skb);
751 }
752 return 0;
753 }
754
755 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
756 int proto)
757 {
758 int err;
759
760 UDP_SKB_CB(skb)->partial_cov = 0;
761 UDP_SKB_CB(skb)->cscov = skb->len;
762
763 if (proto == IPPROTO_UDPLITE) {
764 err = udplite_checksum_init(skb, uh);
765 if (err)
766 return err;
767 }
768
769 if (uh->check == 0) {
770 /* RFC 2460 section 8.1 says that we SHOULD log
771 this error. Well, it is reasonable.
772 */
773 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
774 return 1;
775 }
776 if (skb->ip_summed == CHECKSUM_COMPLETE &&
777 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
778 skb->len, proto, skb->csum))
779 skb->ip_summed = CHECKSUM_UNNECESSARY;
780
781 if (!skb_csum_unnecessary(skb))
782 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
783 &ipv6_hdr(skb)->daddr,
784 skb->len, proto, 0));
785
786 return 0;
787 }
788
789 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
790 int proto)
791 {
792 struct net *net = dev_net(skb->dev);
793 struct sock *sk;
794 struct udphdr *uh;
795 const struct in6_addr *saddr, *daddr;
796 u32 ulen = 0;
797
798 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
799 goto discard;
800
801 saddr = &ipv6_hdr(skb)->saddr;
802 daddr = &ipv6_hdr(skb)->daddr;
803 uh = udp_hdr(skb);
804
805 ulen = ntohs(uh->len);
806 if (ulen > skb->len)
807 goto short_packet;
808
809 if (proto == IPPROTO_UDP) {
810 /* UDP validates ulen. */
811
812 /* Check for jumbo payload */
813 if (ulen == 0)
814 ulen = skb->len;
815
816 if (ulen < sizeof(*uh))
817 goto short_packet;
818
819 if (ulen < skb->len) {
820 if (pskb_trim_rcsum(skb, ulen))
821 goto short_packet;
822 saddr = &ipv6_hdr(skb)->saddr;
823 daddr = &ipv6_hdr(skb)->daddr;
824 uh = udp_hdr(skb);
825 }
826 }
827
828 if (udp6_csum_init(skb, uh, proto))
829 goto discard;
830
831 /*
832 * Multicast receive code
833 */
834 if (ipv6_addr_is_multicast(daddr))
835 return __udp6_lib_mcast_deliver(net, skb,
836 saddr, daddr, udptable);
837
838 /* Unicast */
839
840 /*
841 * check socket cache ... must talk to Alan about his plans
842 * for sock caches... i'll skip this for now.
843 */
844 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
845 if (sk != NULL) {
846 int ret = udpv6_queue_rcv_skb(sk, skb);
847 sock_put(sk);
848
849 /* a return value > 0 means to resubmit the input, but
850 * it wants the return to be -protocol, or 0
851 */
852 if (ret > 0)
853 return -ret;
854
855 return 0;
856 }
857
858 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
859 goto discard;
860
861 if (udp_lib_checksum_complete(skb))
862 goto discard;
863
864 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
865 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
866
867 kfree_skb(skb);
868 return 0;
869
870 short_packet:
871 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
872 proto == IPPROTO_UDPLITE ? "-Lite" : "",
873 saddr,
874 ntohs(uh->source),
875 ulen,
876 skb->len,
877 daddr,
878 ntohs(uh->dest));
879
880 discard:
881 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
882 kfree_skb(skb);
883 return 0;
884 }
885
886 static __inline__ int udpv6_rcv(struct sk_buff *skb)
887 {
888 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
889 }
890
891 /*
892 * Throw away all pending data and cancel the corking. Socket is locked.
893 */
894 static void udp_v6_flush_pending_frames(struct sock *sk)
895 {
896 struct udp_sock *up = udp_sk(sk);
897
898 if (up->pending == AF_INET)
899 udp_flush_pending_frames(sk);
900 else if (up->pending) {
901 up->len = 0;
902 up->pending = 0;
903 ip6_flush_pending_frames(sk);
904 }
905 }
906
907 /**
908 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
909 * @sk: socket we are sending on
910 * @skb: sk_buff containing the filled-in UDP header
911 * (checksum field must be zeroed out)
912 */
913 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
914 const struct in6_addr *saddr,
915 const struct in6_addr *daddr, int len)
916 {
917 unsigned int offset;
918 struct udphdr *uh = udp_hdr(skb);
919 __wsum csum = 0;
920
921 if (skb_queue_len(&sk->sk_write_queue) == 1) {
922 /* Only one fragment on the socket. */
923 skb->csum_start = skb_transport_header(skb) - skb->head;
924 skb->csum_offset = offsetof(struct udphdr, check);
925 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
926 } else {
927 /*
928 * HW-checksum won't work as there are two or more
929 * fragments on the socket so that all csums of sk_buffs
930 * should be together
931 */
932 offset = skb_transport_offset(skb);
933 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
934
935 skb->ip_summed = CHECKSUM_NONE;
936
937 skb_queue_walk(&sk->sk_write_queue, skb) {
938 csum = csum_add(csum, skb->csum);
939 }
940
941 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
942 csum);
943 if (uh->check == 0)
944 uh->check = CSUM_MANGLED_0;
945 }
946 }
947
948 /*
949 * Sending
950 */
951
952 static int udp_v6_push_pending_frames(struct sock *sk)
953 {
954 struct sk_buff *skb;
955 struct udphdr *uh;
956 struct udp_sock *up = udp_sk(sk);
957 struct inet_sock *inet = inet_sk(sk);
958 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
959 int err = 0;
960 int is_udplite = IS_UDPLITE(sk);
961 __wsum csum = 0;
962
963 /* Grab the skbuff where UDP header space exists. */
964 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
965 goto out;
966
967 /*
968 * Create a UDP header
969 */
970 uh = udp_hdr(skb);
971 uh->source = fl6->fl6_sport;
972 uh->dest = fl6->fl6_dport;
973 uh->len = htons(up->len);
974 uh->check = 0;
975
976 if (is_udplite)
977 csum = udplite_csum_outgoing(sk, skb);
978 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
979 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
980 up->len);
981 goto send;
982 } else
983 csum = udp_csum_outgoing(sk, skb);
984
985 /* add protocol-dependent pseudo-header */
986 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
987 up->len, fl6->flowi6_proto, csum);
988 if (uh->check == 0)
989 uh->check = CSUM_MANGLED_0;
990
991 send:
992 err = ip6_push_pending_frames(sk);
993 if (err) {
994 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
995 UDP6_INC_STATS_USER(sock_net(sk),
996 UDP_MIB_SNDBUFERRORS, is_udplite);
997 err = 0;
998 }
999 } else
1000 UDP6_INC_STATS_USER(sock_net(sk),
1001 UDP_MIB_OUTDATAGRAMS, is_udplite);
1002 out:
1003 up->len = 0;
1004 up->pending = 0;
1005 return err;
1006 }
1007
1008 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1009 struct msghdr *msg, size_t len)
1010 {
1011 struct ipv6_txoptions opt_space;
1012 struct udp_sock *up = udp_sk(sk);
1013 struct inet_sock *inet = inet_sk(sk);
1014 struct ipv6_pinfo *np = inet6_sk(sk);
1015 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1016 struct in6_addr *daddr, *final_p, final;
1017 struct ipv6_txoptions *opt = NULL;
1018 struct ip6_flowlabel *flowlabel = NULL;
1019 struct flowi6 fl6;
1020 struct dst_entry *dst;
1021 int addr_len = msg->msg_namelen;
1022 int ulen = len;
1023 int hlimit = -1;
1024 int tclass = -1;
1025 int dontfrag = -1;
1026 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1027 int err;
1028 int connected = 0;
1029 int is_udplite = IS_UDPLITE(sk);
1030 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1031
1032 /* destination address check */
1033 if (sin6) {
1034 if (addr_len < offsetof(struct sockaddr, sa_data))
1035 return -EINVAL;
1036
1037 switch (sin6->sin6_family) {
1038 case AF_INET6:
1039 if (addr_len < SIN6_LEN_RFC2133)
1040 return -EINVAL;
1041 daddr = &sin6->sin6_addr;
1042 break;
1043 case AF_INET:
1044 goto do_udp_sendmsg;
1045 case AF_UNSPEC:
1046 msg->msg_name = sin6 = NULL;
1047 msg->msg_namelen = addr_len = 0;
1048 daddr = NULL;
1049 break;
1050 default:
1051 return -EINVAL;
1052 }
1053 } else if (!up->pending) {
1054 if (sk->sk_state != TCP_ESTABLISHED)
1055 return -EDESTADDRREQ;
1056 daddr = &np->daddr;
1057 } else
1058 daddr = NULL;
1059
1060 if (daddr) {
1061 if (ipv6_addr_v4mapped(daddr)) {
1062 struct sockaddr_in sin;
1063 sin.sin_family = AF_INET;
1064 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1065 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1066 msg->msg_name = &sin;
1067 msg->msg_namelen = sizeof(sin);
1068 do_udp_sendmsg:
1069 if (__ipv6_only_sock(sk))
1070 return -ENETUNREACH;
1071 return udp_sendmsg(iocb, sk, msg, len);
1072 }
1073 }
1074
1075 if (up->pending == AF_INET)
1076 return udp_sendmsg(iocb, sk, msg, len);
1077
1078 /* Rough check on arithmetic overflow,
1079 better check is made in ip6_append_data().
1080 */
1081 if (len > INT_MAX - sizeof(struct udphdr))
1082 return -EMSGSIZE;
1083
1084 if (up->pending) {
1085 /*
1086 * There are pending frames.
1087 * The socket lock must be held while it's corked.
1088 */
1089 lock_sock(sk);
1090 if (likely(up->pending)) {
1091 if (unlikely(up->pending != AF_INET6)) {
1092 release_sock(sk);
1093 return -EAFNOSUPPORT;
1094 }
1095 dst = NULL;
1096 goto do_append_data;
1097 }
1098 release_sock(sk);
1099 }
1100 ulen += sizeof(struct udphdr);
1101
1102 memset(&fl6, 0, sizeof(fl6));
1103
1104 if (sin6) {
1105 if (sin6->sin6_port == 0)
1106 return -EINVAL;
1107
1108 fl6.fl6_dport = sin6->sin6_port;
1109 daddr = &sin6->sin6_addr;
1110
1111 if (np->sndflow) {
1112 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1113 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1114 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1115 if (flowlabel == NULL)
1116 return -EINVAL;
1117 daddr = &flowlabel->dst;
1118 }
1119 }
1120
1121 /*
1122 * Otherwise it will be difficult to maintain
1123 * sk->sk_dst_cache.
1124 */
1125 if (sk->sk_state == TCP_ESTABLISHED &&
1126 ipv6_addr_equal(daddr, &np->daddr))
1127 daddr = &np->daddr;
1128
1129 if (addr_len >= sizeof(struct sockaddr_in6) &&
1130 sin6->sin6_scope_id &&
1131 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1132 fl6.flowi6_oif = sin6->sin6_scope_id;
1133 } else {
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 return -EDESTADDRREQ;
1136
1137 fl6.fl6_dport = inet->inet_dport;
1138 daddr = &np->daddr;
1139 fl6.flowlabel = np->flow_label;
1140 connected = 1;
1141 }
1142
1143 if (!fl6.flowi6_oif)
1144 fl6.flowi6_oif = sk->sk_bound_dev_if;
1145
1146 if (!fl6.flowi6_oif)
1147 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1148
1149 fl6.flowi6_mark = sk->sk_mark;
1150
1151 if (msg->msg_controllen) {
1152 opt = &opt_space;
1153 memset(opt, 0, sizeof(struct ipv6_txoptions));
1154 opt->tot_len = sizeof(*opt);
1155
1156 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1157 &hlimit, &tclass, &dontfrag);
1158 if (err < 0) {
1159 fl6_sock_release(flowlabel);
1160 return err;
1161 }
1162 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1163 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1164 if (flowlabel == NULL)
1165 return -EINVAL;
1166 }
1167 if (!(opt->opt_nflen|opt->opt_flen))
1168 opt = NULL;
1169 connected = 0;
1170 }
1171 if (opt == NULL)
1172 opt = np->opt;
1173 if (flowlabel)
1174 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1175 opt = ipv6_fixup_options(&opt_space, opt);
1176
1177 fl6.flowi6_proto = sk->sk_protocol;
1178 if (!ipv6_addr_any(daddr))
1179 fl6.daddr = *daddr;
1180 else
1181 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1182 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1183 fl6.saddr = np->saddr;
1184 fl6.fl6_sport = inet->inet_sport;
1185
1186 final_p = fl6_update_dst(&fl6, opt, &final);
1187 if (final_p)
1188 connected = 0;
1189
1190 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1191 fl6.flowi6_oif = np->mcast_oif;
1192 connected = 0;
1193 } else if (!fl6.flowi6_oif)
1194 fl6.flowi6_oif = np->ucast_oif;
1195
1196 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1197
1198 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1199 if (IS_ERR(dst)) {
1200 err = PTR_ERR(dst);
1201 dst = NULL;
1202 goto out;
1203 }
1204
1205 if (hlimit < 0) {
1206 if (ipv6_addr_is_multicast(&fl6.daddr))
1207 hlimit = np->mcast_hops;
1208 else
1209 hlimit = np->hop_limit;
1210 if (hlimit < 0)
1211 hlimit = ip6_dst_hoplimit(dst);
1212 }
1213
1214 if (tclass < 0)
1215 tclass = np->tclass;
1216
1217 if (dontfrag < 0)
1218 dontfrag = np->dontfrag;
1219
1220 if (msg->msg_flags&MSG_CONFIRM)
1221 goto do_confirm;
1222 back_from_confirm:
1223
1224 lock_sock(sk);
1225 if (unlikely(up->pending)) {
1226 /* The socket is already corked while preparing it. */
1227 /* ... which is an evident application bug. --ANK */
1228 release_sock(sk);
1229
1230 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1231 err = -EINVAL;
1232 goto out;
1233 }
1234
1235 up->pending = AF_INET6;
1236
1237 do_append_data:
1238 up->len += ulen;
1239 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1240 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1241 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1242 (struct rt6_info*)dst,
1243 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1244 if (err)
1245 udp_v6_flush_pending_frames(sk);
1246 else if (!corkreq)
1247 err = udp_v6_push_pending_frames(sk);
1248 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1249 up->pending = 0;
1250
1251 if (dst) {
1252 if (connected) {
1253 ip6_dst_store(sk, dst,
1254 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1255 &np->daddr : NULL,
1256 #ifdef CONFIG_IPV6_SUBTREES
1257 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1258 &np->saddr :
1259 #endif
1260 NULL);
1261 } else {
1262 dst_release(dst);
1263 }
1264 dst = NULL;
1265 }
1266
1267 if (err > 0)
1268 err = np->recverr ? net_xmit_errno(err) : 0;
1269 release_sock(sk);
1270 out:
1271 dst_release(dst);
1272 fl6_sock_release(flowlabel);
1273 if (!err)
1274 return len;
1275 /*
1276 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1277 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1278 * we don't have a good statistic (IpOutDiscards but it can be too many
1279 * things). We could add another new stat but at least for now that
1280 * seems like overkill.
1281 */
1282 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1283 UDP6_INC_STATS_USER(sock_net(sk),
1284 UDP_MIB_SNDBUFERRORS, is_udplite);
1285 }
1286 return err;
1287
1288 do_confirm:
1289 dst_confirm(dst);
1290 if (!(msg->msg_flags&MSG_PROBE) || len)
1291 goto back_from_confirm;
1292 err = 0;
1293 goto out;
1294 }
1295
1296 void udpv6_destroy_sock(struct sock *sk)
1297 {
1298 lock_sock(sk);
1299 udp_v6_flush_pending_frames(sk);
1300 release_sock(sk);
1301
1302 inet6_destroy_sock(sk);
1303 }
1304
1305 /*
1306 * Socket option code for UDP
1307 */
1308 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1309 char __user *optval, unsigned int optlen)
1310 {
1311 if (level == SOL_UDP || level == SOL_UDPLITE)
1312 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1313 udp_v6_push_pending_frames);
1314 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1315 }
1316
1317 #ifdef CONFIG_COMPAT
1318 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1319 char __user *optval, unsigned int optlen)
1320 {
1321 if (level == SOL_UDP || level == SOL_UDPLITE)
1322 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1323 udp_v6_push_pending_frames);
1324 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1325 }
1326 #endif
1327
1328 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1329 char __user *optval, int __user *optlen)
1330 {
1331 if (level == SOL_UDP || level == SOL_UDPLITE)
1332 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1333 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1334 }
1335
1336 #ifdef CONFIG_COMPAT
1337 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1338 char __user *optval, int __user *optlen)
1339 {
1340 if (level == SOL_UDP || level == SOL_UDPLITE)
1341 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1342 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1343 }
1344 #endif
1345
1346 static const struct inet6_protocol udpv6_protocol = {
1347 .handler = udpv6_rcv,
1348 .err_handler = udpv6_err,
1349 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1350 };
1351
1352 /* ------------------------------------------------------------------------ */
1353 #ifdef CONFIG_PROC_FS
1354
1355 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1356 {
1357 struct inet_sock *inet = inet_sk(sp);
1358 struct ipv6_pinfo *np = inet6_sk(sp);
1359 const struct in6_addr *dest, *src;
1360 __u16 destp, srcp;
1361
1362 dest = &np->daddr;
1363 src = &np->rcv_saddr;
1364 destp = ntohs(inet->inet_dport);
1365 srcp = ntohs(inet->inet_sport);
1366 seq_printf(seq,
1367 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1368 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1369 bucket,
1370 src->s6_addr32[0], src->s6_addr32[1],
1371 src->s6_addr32[2], src->s6_addr32[3], srcp,
1372 dest->s6_addr32[0], dest->s6_addr32[1],
1373 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1374 sp->sk_state,
1375 sk_wmem_alloc_get(sp),
1376 sk_rmem_alloc_get(sp),
1377 0, 0L, 0,
1378 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1379 0,
1380 sock_i_ino(sp),
1381 atomic_read(&sp->sk_refcnt), sp,
1382 atomic_read(&sp->sk_drops));
1383 }
1384
1385 int udp6_seq_show(struct seq_file *seq, void *v)
1386 {
1387 if (v == SEQ_START_TOKEN)
1388 seq_printf(seq,
1389 " sl "
1390 "local_address "
1391 "remote_address "
1392 "st tx_queue rx_queue tr tm->when retrnsmt"
1393 " uid timeout inode ref pointer drops\n");
1394 else
1395 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1396 return 0;
1397 }
1398
1399 static const struct file_operations udp6_afinfo_seq_fops = {
1400 .owner = THIS_MODULE,
1401 .open = udp_seq_open,
1402 .read = seq_read,
1403 .llseek = seq_lseek,
1404 .release = seq_release_net
1405 };
1406
1407 static struct udp_seq_afinfo udp6_seq_afinfo = {
1408 .name = "udp6",
1409 .family = AF_INET6,
1410 .udp_table = &udp_table,
1411 .seq_fops = &udp6_afinfo_seq_fops,
1412 .seq_ops = {
1413 .show = udp6_seq_show,
1414 },
1415 };
1416
1417 int __net_init udp6_proc_init(struct net *net)
1418 {
1419 return udp_proc_register(net, &udp6_seq_afinfo);
1420 }
1421
1422 void udp6_proc_exit(struct net *net) {
1423 udp_proc_unregister(net, &udp6_seq_afinfo);
1424 }
1425 #endif /* CONFIG_PROC_FS */
1426
1427 /* ------------------------------------------------------------------------ */
1428
1429 struct proto udpv6_prot = {
1430 .name = "UDPv6",
1431 .owner = THIS_MODULE,
1432 .close = udp_lib_close,
1433 .connect = ip6_datagram_connect,
1434 .disconnect = udp_disconnect,
1435 .ioctl = udp_ioctl,
1436 .destroy = udpv6_destroy_sock,
1437 .setsockopt = udpv6_setsockopt,
1438 .getsockopt = udpv6_getsockopt,
1439 .sendmsg = udpv6_sendmsg,
1440 .recvmsg = udpv6_recvmsg,
1441 .backlog_rcv = __udpv6_queue_rcv_skb,
1442 .hash = udp_lib_hash,
1443 .unhash = udp_lib_unhash,
1444 .rehash = udp_v6_rehash,
1445 .get_port = udp_v6_get_port,
1446 .memory_allocated = &udp_memory_allocated,
1447 .sysctl_mem = sysctl_udp_mem,
1448 .sysctl_wmem = &sysctl_udp_wmem_min,
1449 .sysctl_rmem = &sysctl_udp_rmem_min,
1450 .obj_size = sizeof(struct udp6_sock),
1451 .slab_flags = SLAB_DESTROY_BY_RCU,
1452 .h.udp_table = &udp_table,
1453 #ifdef CONFIG_COMPAT
1454 .compat_setsockopt = compat_udpv6_setsockopt,
1455 .compat_getsockopt = compat_udpv6_getsockopt,
1456 #endif
1457 .clear_sk = sk_prot_clear_portaddr_nulls,
1458 };
1459
1460 static struct inet_protosw udpv6_protosw = {
1461 .type = SOCK_DGRAM,
1462 .protocol = IPPROTO_UDP,
1463 .prot = &udpv6_prot,
1464 .ops = &inet6_dgram_ops,
1465 .no_check = UDP_CSUM_DEFAULT,
1466 .flags = INET_PROTOSW_PERMANENT,
1467 };
1468
1469
1470 int __init udpv6_init(void)
1471 {
1472 int ret;
1473
1474 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1475 if (ret)
1476 goto out;
1477
1478 ret = inet6_register_protosw(&udpv6_protosw);
1479 if (ret)
1480 goto out_udpv6_protocol;
1481 out:
1482 return ret;
1483
1484 out_udpv6_protocol:
1485 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1486 goto out;
1487 }
1488
1489 void udpv6_exit(void)
1490 {
1491 inet6_unregister_protosw(&udpv6_protosw);
1492 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1493 }
Linux kernel - Deliverables
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