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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6/btrfs-unstable.git] / net / ipv6 / udp.c
blob2a15f1bb6ef8643a07997b89f71f034231ea653c
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 <linux/uaccess.h>
39
40 #include <net/addrconf.h>
41 #include <net/ndisc.h>
42 #include <net/protocol.h>
43 #include <net/transp_v6.h>
44 #include <net/ip6_route.h>
45 #include <net/raw.h>
46 #include <net/tcp_states.h>
47 #include <net/ip6_checksum.h>
48 #include <net/xfrm.h>
49 #include <net/inet_hashtables.h>
50 #include <net/inet6_hashtables.h>
51 #include <net/busy_poll.h>
52 #include <net/sock_reuseport.h>
53
54 #include <linux/proc_fs.h>
55 #include <linux/seq_file.h>
56 #include <trace/events/skb.h>
57 #include "udp_impl.h"
58
59 static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
60 {
61 #if defined(CONFIG_NET_L3_MASTER_DEV)
62 if (!net->ipv4.sysctl_udp_l3mdev_accept &&
63 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags))
64 return true;
65 #endif
66 return false;
67 }
68
69 static u32 udp6_ehashfn(const struct net *net,
70 const struct in6_addr *laddr,
71 const u16 lport,
72 const struct in6_addr *faddr,
73 const __be16 fport)
74 {
75 static u32 udp6_ehash_secret __read_mostly;
76 static u32 udp_ipv6_hash_secret __read_mostly;
77
78 u32 lhash, fhash;
79
80 net_get_random_once(&udp6_ehash_secret,
81 sizeof(udp6_ehash_secret));
82 net_get_random_once(&udp_ipv6_hash_secret,
83 sizeof(udp_ipv6_hash_secret));
84
85 lhash = (__force u32)laddr->s6_addr32[3];
86 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
87
88 return __inet6_ehashfn(lhash, lport, fhash, fport,
89 udp_ipv6_hash_secret + net_hash_mix(net));
90 }
91
92 static u32 udp6_portaddr_hash(const struct net *net,
93 const struct in6_addr *addr6,
94 unsigned int port)
95 {
96 unsigned int hash, mix = net_hash_mix(net);
97
98 if (ipv6_addr_any(addr6))
99 hash = jhash_1word(0, mix);
100 else if (ipv6_addr_v4mapped(addr6))
101 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
102 else
103 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
104
105 return hash ^ port;
106 }
107
108 int udp_v6_get_port(struct sock *sk, unsigned short snum)
109 {
110 unsigned int hash2_nulladdr =
111 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
112 unsigned int hash2_partial =
113 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
114
115 /* precompute partial secondary hash */
116 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
117 return udp_lib_get_port(sk, snum, hash2_nulladdr);
118 }
119
120 static void udp_v6_rehash(struct sock *sk)
121 {
122 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
123 &sk->sk_v6_rcv_saddr,
124 inet_sk(sk)->inet_num);
125
126 udp_lib_rehash(sk, new_hash);
127 }
128
129 static int compute_score(struct sock *sk, struct net *net,
130 const struct in6_addr *saddr, __be16 sport,
131 const struct in6_addr *daddr, unsigned short hnum,
132 int dif, int sdif, bool exact_dif)
133 {
134 int score;
135 struct inet_sock *inet;
136
137 if (!net_eq(sock_net(sk), net) ||
138 udp_sk(sk)->udp_port_hash != hnum ||
139 sk->sk_family != PF_INET6)
140 return -1;
141
142 score = 0;
143 inet = inet_sk(sk);
144
145 if (inet->inet_dport) {
146 if (inet->inet_dport != sport)
147 return -1;
148 score++;
149 }
150
151 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
152 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
153 return -1;
154 score++;
155 }
156
157 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
158 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
159 return -1;
160 score++;
161 }
162
163 if (sk->sk_bound_dev_if || exact_dif) {
164 bool dev_match = (sk->sk_bound_dev_if == dif ||
165 sk->sk_bound_dev_if == sdif);
166
167 if (exact_dif && !dev_match)
168 return -1;
169 if (sk->sk_bound_dev_if && dev_match)
170 score++;
171 }
172
173 if (sk->sk_incoming_cpu == raw_smp_processor_id())
174 score++;
175
176 return score;
177 }
178
179 /* called with rcu_read_lock() */
180 static struct sock *udp6_lib_lookup2(struct net *net,
181 const struct in6_addr *saddr, __be16 sport,
182 const struct in6_addr *daddr, unsigned int hnum,
183 int dif, int sdif, bool exact_dif,
184 struct udp_hslot *hslot2, struct sk_buff *skb)
185 {
186 struct sock *sk, *result;
187 int score, badness, matches = 0, reuseport = 0;
188 u32 hash = 0;
189
190 result = NULL;
191 badness = -1;
192 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
193 score = compute_score(sk, net, saddr, sport,
194 daddr, hnum, dif, sdif, exact_dif);
195 if (score > badness) {
196 reuseport = sk->sk_reuseport;
197 if (reuseport) {
198 hash = udp6_ehashfn(net, daddr, hnum,
199 saddr, sport);
200
201 result = reuseport_select_sock(sk, hash, skb,
202 sizeof(struct udphdr));
203 if (result)
204 return result;
205 matches = 1;
206 }
207 result = sk;
208 badness = score;
209 } else if (score == badness && reuseport) {
210 matches++;
211 if (reciprocal_scale(hash, matches) == 0)
212 result = sk;
213 hash = next_pseudo_random32(hash);
214 }
215 }
216 return result;
217 }
218
219 /* rcu_read_lock() must be held */
220 struct sock *__udp6_lib_lookup(struct net *net,
221 const struct in6_addr *saddr, __be16 sport,
222 const struct in6_addr *daddr, __be16 dport,
223 int dif, int sdif, struct udp_table *udptable,
224 struct sk_buff *skb)
225 {
226 struct sock *sk, *result;
227 unsigned short hnum = ntohs(dport);
228 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
229 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
230 bool exact_dif = udp6_lib_exact_dif_match(net, skb);
231 int score, badness, matches = 0, reuseport = 0;
232 u32 hash = 0;
233
234 if (hslot->count > 10) {
235 hash2 = udp6_portaddr_hash(net, daddr, hnum);
236 slot2 = hash2 & udptable->mask;
237 hslot2 = &udptable->hash2[slot2];
238 if (hslot->count < hslot2->count)
239 goto begin;
240
241 result = udp6_lib_lookup2(net, saddr, sport,
242 daddr, hnum, dif, sdif, exact_dif,
243 hslot2, skb);
244 if (!result) {
245 unsigned int old_slot2 = slot2;
246 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
247 slot2 = hash2 & udptable->mask;
248 /* avoid searching the same slot again. */
249 if (unlikely(slot2 == old_slot2))
250 return result;
251
252 hslot2 = &udptable->hash2[slot2];
253 if (hslot->count < hslot2->count)
254 goto begin;
255
256 result = udp6_lib_lookup2(net, saddr, sport,
257 daddr, hnum, dif, sdif,
258 exact_dif, hslot2,
259 skb);
260 }
261 return result;
262 }
263 begin:
264 result = NULL;
265 badness = -1;
266 sk_for_each_rcu(sk, &hslot->head) {
267 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif,
268 sdif, exact_dif);
269 if (score > badness) {
270 reuseport = sk->sk_reuseport;
271 if (reuseport) {
272 hash = udp6_ehashfn(net, daddr, hnum,
273 saddr, sport);
274 result = reuseport_select_sock(sk, hash, skb,
275 sizeof(struct udphdr));
276 if (result)
277 return result;
278 matches = 1;
279 }
280 result = sk;
281 badness = score;
282 } else if (score == badness && reuseport) {
283 matches++;
284 if (reciprocal_scale(hash, matches) == 0)
285 result = sk;
286 hash = next_pseudo_random32(hash);
287 }
288 }
289 return result;
290 }
291 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
292
293 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
294 __be16 sport, __be16 dport,
295 struct udp_table *udptable)
296 {
297 const struct ipv6hdr *iph = ipv6_hdr(skb);
298
299 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
300 &iph->daddr, dport, inet6_iif(skb),
301 inet6_sdif(skb), udptable, skb);
302 }
303
304 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
305 __be16 sport, __be16 dport)
306 {
307 const struct ipv6hdr *iph = ipv6_hdr(skb);
308
309 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
310 &iph->daddr, dport, inet6_iif(skb),
311 inet6_sdif(skb), &udp_table, skb);
312 }
313 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
314
315 /* Must be called under rcu_read_lock().
316 * Does increment socket refcount.
317 */
318 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
319 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
320 IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
321 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
322 const struct in6_addr *daddr, __be16 dport, int dif)
323 {
324 struct sock *sk;
325
326 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
327 dif, 0, &udp_table, NULL);
328 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
329 sk = NULL;
330 return sk;
331 }
332 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
333 #endif
334
335 /* do not use the scratch area len for jumbogram: their length execeeds the
336 * scratch area space; note that the IP6CB flags is still in the first
337 * cacheline, so checking for jumbograms is cheap
338 */
339 static int udp6_skb_len(struct sk_buff *skb)
340 {
341 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
342 }
343
344 /*
345 * This should be easy, if there is something there we
346 * return it, otherwise we block.
347 */
348
349 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
350 int noblock, int flags, int *addr_len)
351 {
352 struct ipv6_pinfo *np = inet6_sk(sk);
353 struct inet_sock *inet = inet_sk(sk);
354 struct sk_buff *skb;
355 unsigned int ulen, copied;
356 int peeked, peeking, off;
357 int err;
358 int is_udplite = IS_UDPLITE(sk);
359 bool checksum_valid = false;
360 int is_udp4;
361
362 if (flags & MSG_ERRQUEUE)
363 return ipv6_recv_error(sk, msg, len, addr_len);
364
365 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
366 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
367
368 try_again:
369 peeking = flags & MSG_PEEK;
370 off = sk_peek_offset(sk, flags);
371 skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
372 if (!skb)
373 return err;
374
375 ulen = udp6_skb_len(skb);
376 copied = len;
377 if (copied > ulen - off)
378 copied = ulen - off;
379 else if (copied < ulen)
380 msg->msg_flags |= MSG_TRUNC;
381
382 is_udp4 = (skb->protocol == htons(ETH_P_IP));
383
384 /*
385 * If checksum is needed at all, try to do it while copying the
386 * data. If the data is truncated, or if we only want a partial
387 * coverage checksum (UDP-Lite), do it before the copy.
388 */
389
390 if (copied < ulen || peeking ||
391 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
392 checksum_valid = udp_skb_csum_unnecessary(skb) ||
393 !__udp_lib_checksum_complete(skb);
394 if (!checksum_valid)
395 goto csum_copy_err;
396 }
397
398 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
399 if (udp_skb_is_linear(skb))
400 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
401 else
402 err = skb_copy_datagram_msg(skb, off, msg, copied);
403 } else {
404 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
405 if (err == -EINVAL)
406 goto csum_copy_err;
407 }
408 if (unlikely(err)) {
409 if (!peeked) {
410 atomic_inc(&sk->sk_drops);
411 if (is_udp4)
412 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
413 is_udplite);
414 else
415 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
416 is_udplite);
417 }
418 kfree_skb(skb);
419 return err;
420 }
421 if (!peeked) {
422 if (is_udp4)
423 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
424 is_udplite);
425 else
426 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
427 is_udplite);
428 }
429
430 sock_recv_ts_and_drops(msg, sk, skb);
431
432 /* Copy the address. */
433 if (msg->msg_name) {
434 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
435 sin6->sin6_family = AF_INET6;
436 sin6->sin6_port = udp_hdr(skb)->source;
437 sin6->sin6_flowinfo = 0;
438
439 if (is_udp4) {
440 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
441 &sin6->sin6_addr);
442 sin6->sin6_scope_id = 0;
443 } else {
444 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
445 sin6->sin6_scope_id =
446 ipv6_iface_scope_id(&sin6->sin6_addr,
447 inet6_iif(skb));
448 }
449 *addr_len = sizeof(*sin6);
450 }
451
452 if (np->rxopt.all)
453 ip6_datagram_recv_common_ctl(sk, msg, skb);
454
455 if (is_udp4) {
456 if (inet->cmsg_flags)
457 ip_cmsg_recv_offset(msg, sk, skb,
458 sizeof(struct udphdr), off);
459 } else {
460 if (np->rxopt.all)
461 ip6_datagram_recv_specific_ctl(sk, msg, skb);
462 }
463
464 err = copied;
465 if (flags & MSG_TRUNC)
466 err = ulen;
467
468 skb_consume_udp(sk, skb, peeking ? -err : err);
469 return err;
470
471 csum_copy_err:
472 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
473 udp_skb_destructor)) {
474 if (is_udp4) {
475 UDP_INC_STATS(sock_net(sk),
476 UDP_MIB_CSUMERRORS, is_udplite);
477 UDP_INC_STATS(sock_net(sk),
478 UDP_MIB_INERRORS, is_udplite);
479 } else {
480 UDP6_INC_STATS(sock_net(sk),
481 UDP_MIB_CSUMERRORS, is_udplite);
482 UDP6_INC_STATS(sock_net(sk),
483 UDP_MIB_INERRORS, is_udplite);
484 }
485 }
486 kfree_skb(skb);
487
488 /* starting over for a new packet, but check if we need to yield */
489 cond_resched();
490 msg->msg_flags &= ~MSG_TRUNC;
491 goto try_again;
492 }
493
494 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
495 u8 type, u8 code, int offset, __be32 info,
496 struct udp_table *udptable)
497 {
498 struct ipv6_pinfo *np;
499 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
500 const struct in6_addr *saddr = &hdr->saddr;
501 const struct in6_addr *daddr = &hdr->daddr;
502 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
503 struct sock *sk;
504 int harderr;
505 int err;
506 struct net *net = dev_net(skb->dev);
507
508 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
509 inet6_iif(skb), 0, udptable, skb);
510 if (!sk) {
511 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
512 ICMP6_MIB_INERRORS);
513 return;
514 }
515
516 harderr = icmpv6_err_convert(type, code, &err);
517 np = inet6_sk(sk);
518
519 if (type == ICMPV6_PKT_TOOBIG) {
520 if (!ip6_sk_accept_pmtu(sk))
521 goto out;
522 ip6_sk_update_pmtu(skb, sk, info);
523 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
524 harderr = 1;
525 }
526 if (type == NDISC_REDIRECT) {
527 ip6_sk_redirect(skb, sk);
528 goto out;
529 }
530
531 if (!np->recverr) {
532 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
533 goto out;
534 } else {
535 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
536 }
537
538 sk->sk_err = err;
539 sk->sk_error_report(sk);
540 out:
541 return;
542 }
543
544 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
545 {
546 int rc;
547
548 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
549 sock_rps_save_rxhash(sk, skb);
550 sk_mark_napi_id(sk, skb);
551 sk_incoming_cpu_update(sk);
552 } else {
553 sk_mark_napi_id_once(sk, skb);
554 }
555
556 rc = __udp_enqueue_schedule_skb(sk, skb);
557 if (rc < 0) {
558 int is_udplite = IS_UDPLITE(sk);
559
560 /* Note that an ENOMEM error is charged twice */
561 if (rc == -ENOMEM)
562 UDP6_INC_STATS(sock_net(sk),
563 UDP_MIB_RCVBUFERRORS, is_udplite);
564 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
565 kfree_skb(skb);
566 return -1;
567 }
568
569 return 0;
570 }
571
572 static __inline__ void udpv6_err(struct sk_buff *skb,
573 struct inet6_skb_parm *opt, u8 type,
574 u8 code, int offset, __be32 info)
575 {
576 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
577 }
578
579 static struct static_key udpv6_encap_needed __read_mostly;
580 void udpv6_encap_enable(void)
581 {
582 if (!static_key_enabled(&udpv6_encap_needed))
583 static_key_slow_inc(&udpv6_encap_needed);
584 }
585 EXPORT_SYMBOL(udpv6_encap_enable);
586
587 static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
588 {
589 struct udp_sock *up = udp_sk(sk);
590 int is_udplite = IS_UDPLITE(sk);
591
592 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
593 goto drop;
594
595 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
596 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
597
598 /*
599 * This is an encapsulation socket so pass the skb to
600 * the socket's udp_encap_rcv() hook. Otherwise, just
601 * fall through and pass this up the UDP socket.
602 * up->encap_rcv() returns the following value:
603 * =0 if skb was successfully passed to the encap
604 * handler or was discarded by it.
605 * >0 if skb should be passed on to UDP.
606 * <0 if skb should be resubmitted as proto -N
607 */
608
609 /* if we're overly short, let UDP handle it */
610 encap_rcv = ACCESS_ONCE(up->encap_rcv);
611 if (encap_rcv) {
612 int ret;
613
614 /* Verify checksum before giving to encap */
615 if (udp_lib_checksum_complete(skb))
616 goto csum_error;
617
618 ret = encap_rcv(sk, skb);
619 if (ret <= 0) {
620 __UDP_INC_STATS(sock_net(sk),
621 UDP_MIB_INDATAGRAMS,
622 is_udplite);
623 return -ret;
624 }
625 }
626
627 /* FALLTHROUGH -- it's a UDP Packet */
628 }
629
630 /*
631 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
632 */
633 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
634
635 if (up->pcrlen == 0) { /* full coverage was set */
636 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
637 UDP_SKB_CB(skb)->cscov, skb->len);
638 goto drop;
639 }
640 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
641 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
642 UDP_SKB_CB(skb)->cscov, up->pcrlen);
643 goto drop;
644 }
645 }
646
647 prefetch(&sk->sk_rmem_alloc);
648 if (rcu_access_pointer(sk->sk_filter) &&
649 udp_lib_checksum_complete(skb))
650 goto csum_error;
651
652 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
653 goto drop;
654
655 udp_csum_pull_header(skb);
656
657 skb_dst_drop(skb);
658
659 return __udpv6_queue_rcv_skb(sk, skb);
660
661 csum_error:
662 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
663 drop:
664 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
665 atomic_inc(&sk->sk_drops);
666 kfree_skb(skb);
667 return -1;
668 }
669
670 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
671 __be16 loc_port, const struct in6_addr *loc_addr,
672 __be16 rmt_port, const struct in6_addr *rmt_addr,
673 int dif, unsigned short hnum)
674 {
675 struct inet_sock *inet = inet_sk(sk);
676
677 if (!net_eq(sock_net(sk), net))
678 return false;
679
680 if (udp_sk(sk)->udp_port_hash != hnum ||
681 sk->sk_family != PF_INET6 ||
682 (inet->inet_dport && inet->inet_dport != rmt_port) ||
683 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
684 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
685 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
686 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
687 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
688 return false;
689 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
690 return false;
691 return true;
692 }
693
694 static void udp6_csum_zero_error(struct sk_buff *skb)
695 {
696 /* RFC 2460 section 8.1 says that we SHOULD log
697 * this error. Well, it is reasonable.
698 */
699 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
700 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
701 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
702 }
703
704 /*
705 * Note: called only from the BH handler context,
706 * so we don't need to lock the hashes.
707 */
708 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
709 const struct in6_addr *saddr, const struct in6_addr *daddr,
710 struct udp_table *udptable, int proto)
711 {
712 struct sock *sk, *first = NULL;
713 const struct udphdr *uh = udp_hdr(skb);
714 unsigned short hnum = ntohs(uh->dest);
715 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
716 unsigned int offset = offsetof(typeof(*sk), sk_node);
717 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
718 int dif = inet6_iif(skb);
719 struct hlist_node *node;
720 struct sk_buff *nskb;
721
722 if (use_hash2) {
723 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
724 udptable->mask;
725 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
726 start_lookup:
727 hslot = &udptable->hash2[hash2];
728 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
729 }
730
731 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
732 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
733 uh->source, saddr, dif, hnum))
734 continue;
735 /* If zero checksum and no_check is not on for
736 * the socket then skip it.
737 */
738 if (!uh->check && !udp_sk(sk)->no_check6_rx)
739 continue;
740 if (!first) {
741 first = sk;
742 continue;
743 }
744 nskb = skb_clone(skb, GFP_ATOMIC);
745 if (unlikely(!nskb)) {
746 atomic_inc(&sk->sk_drops);
747 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
748 IS_UDPLITE(sk));
749 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
750 IS_UDPLITE(sk));
751 continue;
752 }
753
754 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
755 consume_skb(nskb);
756 }
757
758 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
759 if (use_hash2 && hash2 != hash2_any) {
760 hash2 = hash2_any;
761 goto start_lookup;
762 }
763
764 if (first) {
765 if (udpv6_queue_rcv_skb(first, skb) > 0)
766 consume_skb(skb);
767 } else {
768 kfree_skb(skb);
769 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
770 proto == IPPROTO_UDPLITE);
771 }
772 return 0;
773 }
774
775 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
776 int proto)
777 {
778 const struct in6_addr *saddr, *daddr;
779 struct net *net = dev_net(skb->dev);
780 struct udphdr *uh;
781 struct sock *sk;
782 u32 ulen = 0;
783
784 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
785 goto discard;
786
787 saddr = &ipv6_hdr(skb)->saddr;
788 daddr = &ipv6_hdr(skb)->daddr;
789 uh = udp_hdr(skb);
790
791 ulen = ntohs(uh->len);
792 if (ulen > skb->len)
793 goto short_packet;
794
795 if (proto == IPPROTO_UDP) {
796 /* UDP validates ulen. */
797
798 /* Check for jumbo payload */
799 if (ulen == 0)
800 ulen = skb->len;
801
802 if (ulen < sizeof(*uh))
803 goto short_packet;
804
805 if (ulen < skb->len) {
806 if (pskb_trim_rcsum(skb, ulen))
807 goto short_packet;
808 saddr = &ipv6_hdr(skb)->saddr;
809 daddr = &ipv6_hdr(skb)->daddr;
810 uh = udp_hdr(skb);
811 }
812 }
813
814 if (udp6_csum_init(skb, uh, proto))
815 goto csum_error;
816
817 /* Check if the socket is already available, e.g. due to early demux */
818 sk = skb_steal_sock(skb);
819 if (sk) {
820 struct dst_entry *dst = skb_dst(skb);
821 int ret;
822
823 if (unlikely(sk->sk_rx_dst != dst))
824 udp_sk_rx_dst_set(sk, dst);
825
826 ret = udpv6_queue_rcv_skb(sk, skb);
827 sock_put(sk);
828
829 /* a return value > 0 means to resubmit the input */
830 if (ret > 0)
831 return ret;
832 return 0;
833 }
834
835 /*
836 * Multicast receive code
837 */
838 if (ipv6_addr_is_multicast(daddr))
839 return __udp6_lib_mcast_deliver(net, skb,
840 saddr, daddr, udptable, proto);
841
842 /* Unicast */
843 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
844 if (sk) {
845 int ret;
846
847 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
848 udp6_csum_zero_error(skb);
849 goto csum_error;
850 }
851
852 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
853 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
854 ip6_compute_pseudo);
855
856 ret = udpv6_queue_rcv_skb(sk, skb);
857
858 /* a return value > 0 means to resubmit the input */
859 if (ret > 0)
860 return ret;
861
862 return 0;
863 }
864
865 if (!uh->check) {
866 udp6_csum_zero_error(skb);
867 goto csum_error;
868 }
869
870 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
871 goto discard;
872
873 if (udp_lib_checksum_complete(skb))
874 goto csum_error;
875
876 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
877 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
878
879 kfree_skb(skb);
880 return 0;
881
882 short_packet:
883 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
884 proto == IPPROTO_UDPLITE ? "-Lite" : "",
885 saddr, ntohs(uh->source),
886 ulen, skb->len,
887 daddr, ntohs(uh->dest));
888 goto discard;
889 csum_error:
890 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
891 discard:
892 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
893 kfree_skb(skb);
894 return 0;
895 }
896
897
898 static struct sock *__udp6_lib_demux_lookup(struct net *net,
899 __be16 loc_port, const struct in6_addr *loc_addr,
900 __be16 rmt_port, const struct in6_addr *rmt_addr,
901 int dif, int sdif)
902 {
903 unsigned short hnum = ntohs(loc_port);
904 unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);
905 unsigned int slot2 = hash2 & udp_table.mask;
906 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
907 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
908 struct sock *sk;
909
910 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
911 if (sk->sk_state == TCP_ESTABLISHED &&
912 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
913 return sk;
914 /* Only check first socket in chain */
915 break;
916 }
917 return NULL;
918 }
919
920 static void udp_v6_early_demux(struct sk_buff *skb)
921 {
922 struct net *net = dev_net(skb->dev);
923 const struct udphdr *uh;
924 struct sock *sk;
925 struct dst_entry *dst;
926 int dif = skb->dev->ifindex;
927 int sdif = inet6_sdif(skb);
928
929 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
930 sizeof(struct udphdr)))
931 return;
932
933 uh = udp_hdr(skb);
934
935 if (skb->pkt_type == PACKET_HOST)
936 sk = __udp6_lib_demux_lookup(net, uh->dest,
937 &ipv6_hdr(skb)->daddr,
938 uh->source, &ipv6_hdr(skb)->saddr,
939 dif, sdif);
940 else
941 return;
942
943 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
944 return;
945
946 skb->sk = sk;
947 skb->destructor = sock_efree;
948 dst = READ_ONCE(sk->sk_rx_dst);
949
950 if (dst)
951 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
952 if (dst) {
953 /* set noref for now.
954 * any place which wants to hold dst has to call
955 * dst_hold_safe()
956 */
957 skb_dst_set_noref(skb, dst);
958 }
959 }
960
961 static __inline__ int udpv6_rcv(struct sk_buff *skb)
962 {
963 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
964 }
965
966 /*
967 * Throw away all pending data and cancel the corking. Socket is locked.
968 */
969 static void udp_v6_flush_pending_frames(struct sock *sk)
970 {
971 struct udp_sock *up = udp_sk(sk);
972
973 if (up->pending == AF_INET)
974 udp_flush_pending_frames(sk);
975 else if (up->pending) {
976 up->len = 0;
977 up->pending = 0;
978 ip6_flush_pending_frames(sk);
979 }
980 }
981
982 /**
983 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
984 * @sk: socket we are sending on
985 * @skb: sk_buff containing the filled-in UDP header
986 * (checksum field must be zeroed out)
987 */
988 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
989 const struct in6_addr *saddr,
990 const struct in6_addr *daddr, int len)
991 {
992 unsigned int offset;
993 struct udphdr *uh = udp_hdr(skb);
994 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
995 __wsum csum = 0;
996
997 if (!frags) {
998 /* Only one fragment on the socket. */
999 skb->csum_start = skb_transport_header(skb) - skb->head;
1000 skb->csum_offset = offsetof(struct udphdr, check);
1001 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1002 } else {
1003 /*
1004 * HW-checksum won't work as there are two or more
1005 * fragments on the socket so that all csums of sk_buffs
1006 * should be together
1007 */
1008 offset = skb_transport_offset(skb);
1009 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1010
1011 skb->ip_summed = CHECKSUM_NONE;
1012
1013 do {
1014 csum = csum_add(csum, frags->csum);
1015 } while ((frags = frags->next));
1016
1017 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1018 csum);
1019 if (uh->check == 0)
1020 uh->check = CSUM_MANGLED_0;
1021 }
1022 }
1023
1024 /*
1025 * Sending
1026 */
1027
1028 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1029 {
1030 struct sock *sk = skb->sk;
1031 struct udphdr *uh;
1032 int err = 0;
1033 int is_udplite = IS_UDPLITE(sk);
1034 __wsum csum = 0;
1035 int offset = skb_transport_offset(skb);
1036 int len = skb->len - offset;
1037
1038 /*
1039 * Create a UDP header
1040 */
1041 uh = udp_hdr(skb);
1042 uh->source = fl6->fl6_sport;
1043 uh->dest = fl6->fl6_dport;
1044 uh->len = htons(len);
1045 uh->check = 0;
1046
1047 if (is_udplite)
1048 csum = udplite_csum(skb);
1049 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1050 skb->ip_summed = CHECKSUM_NONE;
1051 goto send;
1052 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1053 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1054 goto send;
1055 } else
1056 csum = udp_csum(skb);
1057
1058 /* add protocol-dependent pseudo-header */
1059 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1060 len, fl6->flowi6_proto, csum);
1061 if (uh->check == 0)
1062 uh->check = CSUM_MANGLED_0;
1063
1064 send:
1065 err = ip6_send_skb(skb);
1066 if (err) {
1067 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1068 UDP6_INC_STATS(sock_net(sk),
1069 UDP_MIB_SNDBUFERRORS, is_udplite);
1070 err = 0;
1071 }
1072 } else {
1073 UDP6_INC_STATS(sock_net(sk),
1074 UDP_MIB_OUTDATAGRAMS, is_udplite);
1075 }
1076 return err;
1077 }
1078
1079 static int udp_v6_push_pending_frames(struct sock *sk)
1080 {
1081 struct sk_buff *skb;
1082 struct udp_sock *up = udp_sk(sk);
1083 struct flowi6 fl6;
1084 int err = 0;
1085
1086 if (up->pending == AF_INET)
1087 return udp_push_pending_frames(sk);
1088
1089 /* ip6_finish_skb will release the cork, so make a copy of
1090 * fl6 here.
1091 */
1092 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1093
1094 skb = ip6_finish_skb(sk);
1095 if (!skb)
1096 goto out;
1097
1098 err = udp_v6_send_skb(skb, &fl6);
1099
1100 out:
1101 up->len = 0;
1102 up->pending = 0;
1103 return err;
1104 }
1105
1106 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1107 {
1108 struct ipv6_txoptions opt_space;
1109 struct udp_sock *up = udp_sk(sk);
1110 struct inet_sock *inet = inet_sk(sk);
1111 struct ipv6_pinfo *np = inet6_sk(sk);
1112 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1113 struct in6_addr *daddr, *final_p, final;
1114 struct ipv6_txoptions *opt = NULL;
1115 struct ipv6_txoptions *opt_to_free = NULL;
1116 struct ip6_flowlabel *flowlabel = NULL;
1117 struct flowi6 fl6;
1118 struct dst_entry *dst;
1119 struct ipcm6_cookie ipc6;
1120 int addr_len = msg->msg_namelen;
1121 int ulen = len;
1122 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1123 int err;
1124 int connected = 0;
1125 int is_udplite = IS_UDPLITE(sk);
1126 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1127 struct sockcm_cookie sockc;
1128
1129 ipc6.hlimit = -1;
1130 ipc6.tclass = -1;
1131 ipc6.dontfrag = -1;
1132 sockc.tsflags = sk->sk_tsflags;
1133
1134 /* destination address check */
1135 if (sin6) {
1136 if (addr_len < offsetof(struct sockaddr, sa_data))
1137 return -EINVAL;
1138
1139 switch (sin6->sin6_family) {
1140 case AF_INET6:
1141 if (addr_len < SIN6_LEN_RFC2133)
1142 return -EINVAL;
1143 daddr = &sin6->sin6_addr;
1144 if (ipv6_addr_any(daddr) &&
1145 ipv6_addr_v4mapped(&np->saddr))
1146 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1147 daddr);
1148 break;
1149 case AF_INET:
1150 goto do_udp_sendmsg;
1151 case AF_UNSPEC:
1152 msg->msg_name = sin6 = NULL;
1153 msg->msg_namelen = addr_len = 0;
1154 daddr = NULL;
1155 break;
1156 default:
1157 return -EINVAL;
1158 }
1159 } else if (!up->pending) {
1160 if (sk->sk_state != TCP_ESTABLISHED)
1161 return -EDESTADDRREQ;
1162 daddr = &sk->sk_v6_daddr;
1163 } else
1164 daddr = NULL;
1165
1166 if (daddr) {
1167 if (ipv6_addr_v4mapped(daddr)) {
1168 struct sockaddr_in sin;
1169 sin.sin_family = AF_INET;
1170 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1171 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1172 msg->msg_name = &sin;
1173 msg->msg_namelen = sizeof(sin);
1174 do_udp_sendmsg:
1175 if (__ipv6_only_sock(sk))
1176 return -ENETUNREACH;
1177 return udp_sendmsg(sk, msg, len);
1178 }
1179 }
1180
1181 if (up->pending == AF_INET)
1182 return udp_sendmsg(sk, msg, len);
1183
1184 /* Rough check on arithmetic overflow,
1185 better check is made in ip6_append_data().
1186 */
1187 if (len > INT_MAX - sizeof(struct udphdr))
1188 return -EMSGSIZE;
1189
1190 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1191 if (up->pending) {
1192 /*
1193 * There are pending frames.
1194 * The socket lock must be held while it's corked.
1195 */
1196 lock_sock(sk);
1197 if (likely(up->pending)) {
1198 if (unlikely(up->pending != AF_INET6)) {
1199 release_sock(sk);
1200 return -EAFNOSUPPORT;
1201 }
1202 dst = NULL;
1203 goto do_append_data;
1204 }
1205 release_sock(sk);
1206 }
1207 ulen += sizeof(struct udphdr);
1208
1209 memset(&fl6, 0, sizeof(fl6));
1210
1211 if (sin6) {
1212 if (sin6->sin6_port == 0)
1213 return -EINVAL;
1214
1215 fl6.fl6_dport = sin6->sin6_port;
1216 daddr = &sin6->sin6_addr;
1217
1218 if (np->sndflow) {
1219 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1220 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1221 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1222 if (!flowlabel)
1223 return -EINVAL;
1224 }
1225 }
1226
1227 /*
1228 * Otherwise it will be difficult to maintain
1229 * sk->sk_dst_cache.
1230 */
1231 if (sk->sk_state == TCP_ESTABLISHED &&
1232 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1233 daddr = &sk->sk_v6_daddr;
1234
1235 if (addr_len >= sizeof(struct sockaddr_in6) &&
1236 sin6->sin6_scope_id &&
1237 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1238 fl6.flowi6_oif = sin6->sin6_scope_id;
1239 } else {
1240 if (sk->sk_state != TCP_ESTABLISHED)
1241 return -EDESTADDRREQ;
1242
1243 fl6.fl6_dport = inet->inet_dport;
1244 daddr = &sk->sk_v6_daddr;
1245 fl6.flowlabel = np->flow_label;
1246 connected = 1;
1247 }
1248
1249 if (!fl6.flowi6_oif)
1250 fl6.flowi6_oif = sk->sk_bound_dev_if;
1251
1252 if (!fl6.flowi6_oif)
1253 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1254
1255 fl6.flowi6_mark = sk->sk_mark;
1256 fl6.flowi6_uid = sk->sk_uid;
1257
1258 if (msg->msg_controllen) {
1259 opt = &opt_space;
1260 memset(opt, 0, sizeof(struct ipv6_txoptions));
1261 opt->tot_len = sizeof(*opt);
1262 ipc6.opt = opt;
1263
1264 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1265 if (err < 0) {
1266 fl6_sock_release(flowlabel);
1267 return err;
1268 }
1269 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1270 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1271 if (!flowlabel)
1272 return -EINVAL;
1273 }
1274 if (!(opt->opt_nflen|opt->opt_flen))
1275 opt = NULL;
1276 connected = 0;
1277 }
1278 if (!opt) {
1279 opt = txopt_get(np);
1280 opt_to_free = opt;
1281 }
1282 if (flowlabel)
1283 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1284 opt = ipv6_fixup_options(&opt_space, opt);
1285 ipc6.opt = opt;
1286
1287 fl6.flowi6_proto = sk->sk_protocol;
1288 if (!ipv6_addr_any(daddr))
1289 fl6.daddr = *daddr;
1290 else
1291 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1292 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1293 fl6.saddr = np->saddr;
1294 fl6.fl6_sport = inet->inet_sport;
1295
1296 final_p = fl6_update_dst(&fl6, opt, &final);
1297 if (final_p)
1298 connected = 0;
1299
1300 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1301 fl6.flowi6_oif = np->mcast_oif;
1302 connected = 0;
1303 } else if (!fl6.flowi6_oif)
1304 fl6.flowi6_oif = np->ucast_oif;
1305
1306 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1307
1308 if (ipc6.tclass < 0)
1309 ipc6.tclass = np->tclass;
1310
1311 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1312
1313 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1314 if (IS_ERR(dst)) {
1315 err = PTR_ERR(dst);
1316 dst = NULL;
1317 goto out;
1318 }
1319
1320 if (ipc6.hlimit < 0)
1321 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1322
1323 if (msg->msg_flags&MSG_CONFIRM)
1324 goto do_confirm;
1325 back_from_confirm:
1326
1327 /* Lockless fast path for the non-corking case */
1328 if (!corkreq) {
1329 struct sk_buff *skb;
1330
1331 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1332 sizeof(struct udphdr), &ipc6,
1333 &fl6, (struct rt6_info *)dst,
1334 msg->msg_flags, &sockc);
1335 err = PTR_ERR(skb);
1336 if (!IS_ERR_OR_NULL(skb))
1337 err = udp_v6_send_skb(skb, &fl6);
1338 goto release_dst;
1339 }
1340
1341 lock_sock(sk);
1342 if (unlikely(up->pending)) {
1343 /* The socket is already corked while preparing it. */
1344 /* ... which is an evident application bug. --ANK */
1345 release_sock(sk);
1346
1347 net_dbg_ratelimited("udp cork app bug 2\n");
1348 err = -EINVAL;
1349 goto out;
1350 }
1351
1352 up->pending = AF_INET6;
1353
1354 do_append_data:
1355 if (ipc6.dontfrag < 0)
1356 ipc6.dontfrag = np->dontfrag;
1357 up->len += ulen;
1358 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1359 &ipc6, &fl6, (struct rt6_info *)dst,
1360 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1361 if (err)
1362 udp_v6_flush_pending_frames(sk);
1363 else if (!corkreq)
1364 err = udp_v6_push_pending_frames(sk);
1365 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1366 up->pending = 0;
1367
1368 if (err > 0)
1369 err = np->recverr ? net_xmit_errno(err) : 0;
1370 release_sock(sk);
1371
1372 release_dst:
1373 if (dst) {
1374 if (connected) {
1375 ip6_dst_store(sk, dst,
1376 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1377 &sk->sk_v6_daddr : NULL,
1378 #ifdef CONFIG_IPV6_SUBTREES
1379 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1380 &np->saddr :
1381 #endif
1382 NULL);
1383 } else {
1384 dst_release(dst);
1385 }
1386 dst = NULL;
1387 }
1388
1389 out:
1390 dst_release(dst);
1391 fl6_sock_release(flowlabel);
1392 txopt_put(opt_to_free);
1393 if (!err)
1394 return len;
1395 /*
1396 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1397 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1398 * we don't have a good statistic (IpOutDiscards but it can be too many
1399 * things). We could add another new stat but at least for now that
1400 * seems like overkill.
1401 */
1402 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1403 UDP6_INC_STATS(sock_net(sk),
1404 UDP_MIB_SNDBUFERRORS, is_udplite);
1405 }
1406 return err;
1407
1408 do_confirm:
1409 if (msg->msg_flags & MSG_PROBE)
1410 dst_confirm_neigh(dst, &fl6.daddr);
1411 if (!(msg->msg_flags&MSG_PROBE) || len)
1412 goto back_from_confirm;
1413 err = 0;
1414 goto out;
1415 }
1416
1417 void udpv6_destroy_sock(struct sock *sk)
1418 {
1419 struct udp_sock *up = udp_sk(sk);
1420 lock_sock(sk);
1421 udp_v6_flush_pending_frames(sk);
1422 release_sock(sk);
1423
1424 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1425 void (*encap_destroy)(struct sock *sk);
1426 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1427 if (encap_destroy)
1428 encap_destroy(sk);
1429 }
1430
1431 inet6_destroy_sock(sk);
1432 }
1433
1434 /*
1435 * Socket option code for UDP
1436 */
1437 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1438 char __user *optval, unsigned int optlen)
1439 {
1440 if (level == SOL_UDP || level == SOL_UDPLITE)
1441 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1442 udp_v6_push_pending_frames);
1443 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1444 }
1445
1446 #ifdef CONFIG_COMPAT
1447 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1448 char __user *optval, unsigned int optlen)
1449 {
1450 if (level == SOL_UDP || level == SOL_UDPLITE)
1451 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1452 udp_v6_push_pending_frames);
1453 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1454 }
1455 #endif
1456
1457 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1458 char __user *optval, int __user *optlen)
1459 {
1460 if (level == SOL_UDP || level == SOL_UDPLITE)
1461 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1462 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1463 }
1464
1465 #ifdef CONFIG_COMPAT
1466 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1467 char __user *optval, int __user *optlen)
1468 {
1469 if (level == SOL_UDP || level == SOL_UDPLITE)
1470 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1471 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1472 }
1473 #endif
1474
1475 static struct inet6_protocol udpv6_protocol = {
1476 .early_demux = udp_v6_early_demux,
1477 .early_demux_handler = udp_v6_early_demux,
1478 .handler = udpv6_rcv,
1479 .err_handler = udpv6_err,
1480 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1481 };
1482
1483 /* ------------------------------------------------------------------------ */
1484 #ifdef CONFIG_PROC_FS
1485 int udp6_seq_show(struct seq_file *seq, void *v)
1486 {
1487 if (v == SEQ_START_TOKEN) {
1488 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1489 } else {
1490 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1491 struct inet_sock *inet = inet_sk(v);
1492 __u16 srcp = ntohs(inet->inet_sport);
1493 __u16 destp = ntohs(inet->inet_dport);
1494 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1495 }
1496 return 0;
1497 }
1498
1499 static const struct file_operations udp6_afinfo_seq_fops = {
1500 .owner = THIS_MODULE,
1501 .open = udp_seq_open,
1502 .read = seq_read,
1503 .llseek = seq_lseek,
1504 .release = seq_release_net
1505 };
1506
1507 static struct udp_seq_afinfo udp6_seq_afinfo = {
1508 .name = "udp6",
1509 .family = AF_INET6,
1510 .udp_table = &udp_table,
1511 .seq_fops = &udp6_afinfo_seq_fops,
1512 .seq_ops = {
1513 .show = udp6_seq_show,
1514 },
1515 };
1516
1517 int __net_init udp6_proc_init(struct net *net)
1518 {
1519 return udp_proc_register(net, &udp6_seq_afinfo);
1520 }
1521
1522 void udp6_proc_exit(struct net *net)
1523 {
1524 udp_proc_unregister(net, &udp6_seq_afinfo);
1525 }
1526 #endif /* CONFIG_PROC_FS */
1527
1528 /* ------------------------------------------------------------------------ */
1529
1530 struct proto udpv6_prot = {
1531 .name = "UDPv6",
1532 .owner = THIS_MODULE,
1533 .close = udp_lib_close,
1534 .connect = ip6_datagram_connect,
1535 .disconnect = udp_disconnect,
1536 .ioctl = udp_ioctl,
1537 .init = udp_init_sock,
1538 .destroy = udpv6_destroy_sock,
1539 .setsockopt = udpv6_setsockopt,
1540 .getsockopt = udpv6_getsockopt,
1541 .sendmsg = udpv6_sendmsg,
1542 .recvmsg = udpv6_recvmsg,
1543 .release_cb = ip6_datagram_release_cb,
1544 .hash = udp_lib_hash,
1545 .unhash = udp_lib_unhash,
1546 .rehash = udp_v6_rehash,
1547 .get_port = udp_v6_get_port,
1548 .memory_allocated = &udp_memory_allocated,
1549 .sysctl_mem = sysctl_udp_mem,
1550 .sysctl_wmem = &sysctl_udp_wmem_min,
1551 .sysctl_rmem = &sysctl_udp_rmem_min,
1552 .obj_size = sizeof(struct udp6_sock),
1553 .h.udp_table = &udp_table,
1554 #ifdef CONFIG_COMPAT
1555 .compat_setsockopt = compat_udpv6_setsockopt,
1556 .compat_getsockopt = compat_udpv6_getsockopt,
1557 #endif
1558 .diag_destroy = udp_abort,
1559 };
1560
1561 static struct inet_protosw udpv6_protosw = {
1562 .type = SOCK_DGRAM,
1563 .protocol = IPPROTO_UDP,
1564 .prot = &udpv6_prot,
1565 .ops = &inet6_dgram_ops,
1566 .flags = INET_PROTOSW_PERMANENT,
1567 };
1568
1569 int __init udpv6_init(void)
1570 {
1571 int ret;
1572
1573 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1574 if (ret)
1575 goto out;
1576
1577 ret = inet6_register_protosw(&udpv6_protosw);
1578 if (ret)
1579 goto out_udpv6_protocol;
1580 out:
1581 return ret;
1582
1583 out_udpv6_protocol:
1584 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1585 goto out;
1586 }
1587
1588 void udpv6_exit(void)
1589 {
1590 inet6_unregister_protosw(&udpv6_protosw);
1591 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1592 }
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