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inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once
[mirror_ubuntu-jammy-kernel.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 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
54 #include "udp_impl.h"
55
56 static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
61 {
62 static u32 udp6_ehash_secret __read_mostly;
63 static u32 udp_ipv6_hash_secret __read_mostly;
64
65 u32 lhash, fhash;
66
67 net_get_random_once(&udp6_ehash_secret,
68 sizeof(udp6_ehash_secret));
69 net_get_random_once(&udp_ipv6_hash_secret,
70 sizeof(udp_ipv6_hash_secret));
71
72 lhash = (__force u32)laddr->s6_addr32[3];
73 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
74
75 return __inet6_ehashfn(lhash, lport, fhash, fport,
76 udp_ipv6_hash_secret + net_hash_mix(net));
77 }
78
79 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
80 {
81 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82 int sk_ipv6only = ipv6_only_sock(sk);
83 int sk2_ipv6only = inet_v6_ipv6only(sk2);
84 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
85 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
86
87 /* if both are mapped, treat as IPv4 */
88 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
89 return (!sk2_ipv6only &&
90 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
91 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
92
93 if (addr_type2 == IPV6_ADDR_ANY &&
94 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
95 return 1;
96
97 if (addr_type == IPV6_ADDR_ANY &&
98 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
99 return 1;
100
101 if (sk2_rcv_saddr6 &&
102 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
103 return 1;
104
105 return 0;
106 }
107
108 static unsigned int udp6_portaddr_hash(struct net *net,
109 const struct in6_addr *addr6,
110 unsigned int port)
111 {
112 unsigned int hash, mix = net_hash_mix(net);
113
114 if (ipv6_addr_any(addr6))
115 hash = jhash_1word(0, mix);
116 else if (ipv6_addr_v4mapped(addr6))
117 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
118 else
119 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
120
121 return hash ^ port;
122 }
123
124
125 int udp_v6_get_port(struct sock *sk, unsigned short snum)
126 {
127 unsigned int hash2_nulladdr =
128 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
129 unsigned int hash2_partial =
130 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
131
132 /* precompute partial secondary hash */
133 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
134 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
135 }
136
137 static void udp_v6_rehash(struct sock *sk)
138 {
139 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
140 &sk->sk_v6_rcv_saddr,
141 inet_sk(sk)->inet_num);
142
143 udp_lib_rehash(sk, new_hash);
144 }
145
146 static inline int compute_score(struct sock *sk, struct net *net,
147 unsigned short hnum,
148 const struct in6_addr *saddr, __be16 sport,
149 const struct in6_addr *daddr, __be16 dport,
150 int dif)
151 {
152 int score = -1;
153
154 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
155 sk->sk_family == PF_INET6) {
156 struct inet_sock *inet = inet_sk(sk);
157
158 score = 0;
159 if (inet->inet_dport) {
160 if (inet->inet_dport != sport)
161 return -1;
162 score++;
163 }
164 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
165 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
166 return -1;
167 score++;
168 }
169 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
170 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
171 return -1;
172 score++;
173 }
174 if (sk->sk_bound_dev_if) {
175 if (sk->sk_bound_dev_if != dif)
176 return -1;
177 score++;
178 }
179 }
180 return score;
181 }
182
183 #define SCORE2_MAX (1 + 1 + 1)
184 static inline int compute_score2(struct sock *sk, struct net *net,
185 const struct in6_addr *saddr, __be16 sport,
186 const struct in6_addr *daddr, unsigned short hnum,
187 int dif)
188 {
189 int score = -1;
190
191 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
192 sk->sk_family == PF_INET6) {
193 struct inet_sock *inet = inet_sk(sk);
194
195 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
196 return -1;
197 score = 0;
198 if (inet->inet_dport) {
199 if (inet->inet_dport != sport)
200 return -1;
201 score++;
202 }
203 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
204 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
205 return -1;
206 score++;
207 }
208 if (sk->sk_bound_dev_if) {
209 if (sk->sk_bound_dev_if != dif)
210 return -1;
211 score++;
212 }
213 }
214 return score;
215 }
216
217
218 /* called with read_rcu_lock() */
219 static struct sock *udp6_lib_lookup2(struct net *net,
220 const struct in6_addr *saddr, __be16 sport,
221 const struct in6_addr *daddr, unsigned int hnum, int dif,
222 struct udp_hslot *hslot2, unsigned int slot2)
223 {
224 struct sock *sk, *result;
225 struct hlist_nulls_node *node;
226 int score, badness, matches = 0, reuseport = 0;
227 u32 hash = 0;
228
229 begin:
230 result = NULL;
231 badness = -1;
232 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
233 score = compute_score2(sk, net, saddr, sport,
234 daddr, hnum, dif);
235 if (score > badness) {
236 result = sk;
237 badness = score;
238 reuseport = sk->sk_reuseport;
239 if (reuseport) {
240 hash = udp6_ehashfn(net, daddr, hnum,
241 saddr, sport);
242 matches = 1;
243 } else if (score == SCORE2_MAX)
244 goto exact_match;
245 } else if (score == badness && reuseport) {
246 matches++;
247 if (((u64)hash * matches) >> 32 == 0)
248 result = sk;
249 hash = next_pseudo_random32(hash);
250 }
251 }
252 /*
253 * if the nulls value we got at the end of this lookup is
254 * not the expected one, we must restart lookup.
255 * We probably met an item that was moved to another chain.
256 */
257 if (get_nulls_value(node) != slot2)
258 goto begin;
259
260 if (result) {
261 exact_match:
262 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
263 result = NULL;
264 else if (unlikely(compute_score2(result, net, saddr, sport,
265 daddr, hnum, dif) < badness)) {
266 sock_put(result);
267 goto begin;
268 }
269 }
270 return result;
271 }
272
273 struct sock *__udp6_lib_lookup(struct net *net,
274 const struct in6_addr *saddr, __be16 sport,
275 const struct in6_addr *daddr, __be16 dport,
276 int dif, struct udp_table *udptable)
277 {
278 struct sock *sk, *result;
279 struct hlist_nulls_node *node;
280 unsigned short hnum = ntohs(dport);
281 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
282 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
283 int score, badness, matches = 0, reuseport = 0;
284 u32 hash = 0;
285
286 rcu_read_lock();
287 if (hslot->count > 10) {
288 hash2 = udp6_portaddr_hash(net, daddr, hnum);
289 slot2 = hash2 & udptable->mask;
290 hslot2 = &udptable->hash2[slot2];
291 if (hslot->count < hslot2->count)
292 goto begin;
293
294 result = udp6_lib_lookup2(net, saddr, sport,
295 daddr, hnum, dif,
296 hslot2, slot2);
297 if (!result) {
298 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
299 slot2 = hash2 & udptable->mask;
300 hslot2 = &udptable->hash2[slot2];
301 if (hslot->count < hslot2->count)
302 goto begin;
303
304 result = udp6_lib_lookup2(net, saddr, sport,
305 &in6addr_any, hnum, dif,
306 hslot2, slot2);
307 }
308 rcu_read_unlock();
309 return result;
310 }
311 begin:
312 result = NULL;
313 badness = -1;
314 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
315 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
316 if (score > badness) {
317 result = sk;
318 badness = score;
319 reuseport = sk->sk_reuseport;
320 if (reuseport) {
321 hash = udp6_ehashfn(net, daddr, hnum,
322 saddr, sport);
323 matches = 1;
324 }
325 } else if (score == badness && reuseport) {
326 matches++;
327 if (((u64)hash * matches) >> 32 == 0)
328 result = sk;
329 hash = next_pseudo_random32(hash);
330 }
331 }
332 /*
333 * if the nulls value we got at the end of this lookup is
334 * not the expected one, we must restart lookup.
335 * We probably met an item that was moved to another chain.
336 */
337 if (get_nulls_value(node) != slot)
338 goto begin;
339
340 if (result) {
341 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
342 result = NULL;
343 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
344 daddr, dport, dif) < badness)) {
345 sock_put(result);
346 goto begin;
347 }
348 }
349 rcu_read_unlock();
350 return result;
351 }
352 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
353
354 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
355 __be16 sport, __be16 dport,
356 struct udp_table *udptable)
357 {
358 struct sock *sk;
359 const struct ipv6hdr *iph = ipv6_hdr(skb);
360
361 if (unlikely(sk = skb_steal_sock(skb)))
362 return sk;
363 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
364 &iph->daddr, dport, inet6_iif(skb),
365 udptable);
366 }
367
368 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
369 const struct in6_addr *daddr, __be16 dport, int dif)
370 {
371 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
372 }
373 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
374
375
376 /*
377 * This should be easy, if there is something there we
378 * return it, otherwise we block.
379 */
380
381 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
382 struct msghdr *msg, size_t len,
383 int noblock, int flags, int *addr_len)
384 {
385 struct ipv6_pinfo *np = inet6_sk(sk);
386 struct inet_sock *inet = inet_sk(sk);
387 struct sk_buff *skb;
388 unsigned int ulen, copied;
389 int peeked, off = 0;
390 int err;
391 int is_udplite = IS_UDPLITE(sk);
392 int is_udp4;
393 bool slow;
394
395 if (addr_len)
396 *addr_len = sizeof(struct sockaddr_in6);
397
398 if (flags & MSG_ERRQUEUE)
399 return ipv6_recv_error(sk, msg, len);
400
401 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
402 return ipv6_recv_rxpmtu(sk, msg, len);
403
404 try_again:
405 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
406 &peeked, &off, &err);
407 if (!skb)
408 goto out;
409
410 ulen = skb->len - sizeof(struct udphdr);
411 copied = len;
412 if (copied > ulen)
413 copied = ulen;
414 else if (copied < ulen)
415 msg->msg_flags |= MSG_TRUNC;
416
417 is_udp4 = (skb->protocol == htons(ETH_P_IP));
418
419 /*
420 * If checksum is needed at all, try to do it while copying the
421 * data. If the data is truncated, or if we only want a partial
422 * coverage checksum (UDP-Lite), do it before the copy.
423 */
424
425 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
426 if (udp_lib_checksum_complete(skb))
427 goto csum_copy_err;
428 }
429
430 if (skb_csum_unnecessary(skb))
431 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
432 msg->msg_iov, copied);
433 else {
434 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
435 if (err == -EINVAL)
436 goto csum_copy_err;
437 }
438 if (unlikely(err)) {
439 trace_kfree_skb(skb, udpv6_recvmsg);
440 if (!peeked) {
441 atomic_inc(&sk->sk_drops);
442 if (is_udp4)
443 UDP_INC_STATS_USER(sock_net(sk),
444 UDP_MIB_INERRORS,
445 is_udplite);
446 else
447 UDP6_INC_STATS_USER(sock_net(sk),
448 UDP_MIB_INERRORS,
449 is_udplite);
450 }
451 goto out_free;
452 }
453 if (!peeked) {
454 if (is_udp4)
455 UDP_INC_STATS_USER(sock_net(sk),
456 UDP_MIB_INDATAGRAMS, is_udplite);
457 else
458 UDP6_INC_STATS_USER(sock_net(sk),
459 UDP_MIB_INDATAGRAMS, is_udplite);
460 }
461
462 sock_recv_ts_and_drops(msg, sk, skb);
463
464 /* Copy the address. */
465 if (msg->msg_name) {
466 struct sockaddr_in6 *sin6;
467
468 sin6 = (struct sockaddr_in6 *) msg->msg_name;
469 sin6->sin6_family = AF_INET6;
470 sin6->sin6_port = udp_hdr(skb)->source;
471 sin6->sin6_flowinfo = 0;
472
473 if (is_udp4) {
474 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
475 &sin6->sin6_addr);
476 sin6->sin6_scope_id = 0;
477 } else {
478 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
479 sin6->sin6_scope_id =
480 ipv6_iface_scope_id(&sin6->sin6_addr,
481 IP6CB(skb)->iif);
482 }
483
484 }
485 if (is_udp4) {
486 if (inet->cmsg_flags)
487 ip_cmsg_recv(msg, skb);
488 } else {
489 if (np->rxopt.all)
490 ip6_datagram_recv_ctl(sk, msg, skb);
491 }
492
493 err = copied;
494 if (flags & MSG_TRUNC)
495 err = ulen;
496
497 out_free:
498 skb_free_datagram_locked(sk, skb);
499 out:
500 return err;
501
502 csum_copy_err:
503 slow = lock_sock_fast(sk);
504 if (!skb_kill_datagram(sk, skb, flags)) {
505 if (is_udp4) {
506 UDP_INC_STATS_USER(sock_net(sk),
507 UDP_MIB_CSUMERRORS, is_udplite);
508 UDP_INC_STATS_USER(sock_net(sk),
509 UDP_MIB_INERRORS, is_udplite);
510 } else {
511 UDP6_INC_STATS_USER(sock_net(sk),
512 UDP_MIB_CSUMERRORS, is_udplite);
513 UDP6_INC_STATS_USER(sock_net(sk),
514 UDP_MIB_INERRORS, is_udplite);
515 }
516 }
517 unlock_sock_fast(sk, slow);
518
519 if (noblock)
520 return -EAGAIN;
521
522 /* starting over for a new packet */
523 msg->msg_flags &= ~MSG_TRUNC;
524 goto try_again;
525 }
526
527 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
528 u8 type, u8 code, int offset, __be32 info,
529 struct udp_table *udptable)
530 {
531 struct ipv6_pinfo *np;
532 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
533 const struct in6_addr *saddr = &hdr->saddr;
534 const struct in6_addr *daddr = &hdr->daddr;
535 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
536 struct sock *sk;
537 int err;
538
539 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
540 saddr, uh->source, inet6_iif(skb), udptable);
541 if (sk == NULL)
542 return;
543
544 if (type == ICMPV6_PKT_TOOBIG)
545 ip6_sk_update_pmtu(skb, sk, info);
546 if (type == NDISC_REDIRECT) {
547 ip6_sk_redirect(skb, sk);
548 goto out;
549 }
550
551 np = inet6_sk(sk);
552
553 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
554 goto out;
555
556 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
557 goto out;
558
559 if (np->recverr)
560 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
561
562 sk->sk_err = err;
563 sk->sk_error_report(sk);
564 out:
565 sock_put(sk);
566 }
567
568 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
569 {
570 int rc;
571
572 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
573 sock_rps_save_rxhash(sk, skb);
574 sk_mark_napi_id(sk, skb);
575 }
576
577 rc = sock_queue_rcv_skb(sk, skb);
578 if (rc < 0) {
579 int is_udplite = IS_UDPLITE(sk);
580
581 /* Note that an ENOMEM error is charged twice */
582 if (rc == -ENOMEM)
583 UDP6_INC_STATS_BH(sock_net(sk),
584 UDP_MIB_RCVBUFERRORS, is_udplite);
585 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
586 kfree_skb(skb);
587 return -1;
588 }
589 return 0;
590 }
591
592 static __inline__ void udpv6_err(struct sk_buff *skb,
593 struct inet6_skb_parm *opt, u8 type,
594 u8 code, int offset, __be32 info )
595 {
596 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
597 }
598
599 static struct static_key udpv6_encap_needed __read_mostly;
600 void udpv6_encap_enable(void)
601 {
602 if (!static_key_enabled(&udpv6_encap_needed))
603 static_key_slow_inc(&udpv6_encap_needed);
604 }
605 EXPORT_SYMBOL(udpv6_encap_enable);
606
607 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
608 {
609 struct udp_sock *up = udp_sk(sk);
610 int rc;
611 int is_udplite = IS_UDPLITE(sk);
612
613 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
614 goto drop;
615
616 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
617 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
618
619 /*
620 * This is an encapsulation socket so pass the skb to
621 * the socket's udp_encap_rcv() hook. Otherwise, just
622 * fall through and pass this up the UDP socket.
623 * up->encap_rcv() returns the following value:
624 * =0 if skb was successfully passed to the encap
625 * handler or was discarded by it.
626 * >0 if skb should be passed on to UDP.
627 * <0 if skb should be resubmitted as proto -N
628 */
629
630 /* if we're overly short, let UDP handle it */
631 encap_rcv = ACCESS_ONCE(up->encap_rcv);
632 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
633 int ret;
634
635 ret = encap_rcv(sk, skb);
636 if (ret <= 0) {
637 UDP_INC_STATS_BH(sock_net(sk),
638 UDP_MIB_INDATAGRAMS,
639 is_udplite);
640 return -ret;
641 }
642 }
643
644 /* FALLTHROUGH -- it's a UDP Packet */
645 }
646
647 /*
648 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
649 */
650 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
651
652 if (up->pcrlen == 0) { /* full coverage was set */
653 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
654 " %d while full coverage %d requested\n",
655 UDP_SKB_CB(skb)->cscov, skb->len);
656 goto drop;
657 }
658 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
659 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
660 "too small, need min %d\n",
661 UDP_SKB_CB(skb)->cscov, up->pcrlen);
662 goto drop;
663 }
664 }
665
666 if (rcu_access_pointer(sk->sk_filter)) {
667 if (udp_lib_checksum_complete(skb))
668 goto csum_error;
669 }
670
671 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
672 goto drop;
673
674 skb_dst_drop(skb);
675
676 bh_lock_sock(sk);
677 rc = 0;
678 if (!sock_owned_by_user(sk))
679 rc = __udpv6_queue_rcv_skb(sk, skb);
680 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
681 bh_unlock_sock(sk);
682 goto drop;
683 }
684 bh_unlock_sock(sk);
685
686 return rc;
687 csum_error:
688 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
689 drop:
690 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
691 atomic_inc(&sk->sk_drops);
692 kfree_skb(skb);
693 return -1;
694 }
695
696 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
697 __be16 loc_port, const struct in6_addr *loc_addr,
698 __be16 rmt_port, const struct in6_addr *rmt_addr,
699 int dif)
700 {
701 struct hlist_nulls_node *node;
702 struct sock *s = sk;
703 unsigned short num = ntohs(loc_port);
704
705 sk_nulls_for_each_from(s, node) {
706 struct inet_sock *inet = inet_sk(s);
707
708 if (!net_eq(sock_net(s), net))
709 continue;
710
711 if (udp_sk(s)->udp_port_hash == num &&
712 s->sk_family == PF_INET6) {
713 if (inet->inet_dport) {
714 if (inet->inet_dport != rmt_port)
715 continue;
716 }
717 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
718 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
719 continue;
720
721 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
722 continue;
723
724 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
725 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
726 continue;
727 }
728 if (!inet6_mc_check(s, loc_addr, rmt_addr))
729 continue;
730 return s;
731 }
732 }
733 return NULL;
734 }
735
736 static void flush_stack(struct sock **stack, unsigned int count,
737 struct sk_buff *skb, unsigned int final)
738 {
739 struct sk_buff *skb1 = NULL;
740 struct sock *sk;
741 unsigned int i;
742
743 for (i = 0; i < count; i++) {
744 sk = stack[i];
745 if (likely(skb1 == NULL))
746 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
747 if (!skb1) {
748 atomic_inc(&sk->sk_drops);
749 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
750 IS_UDPLITE(sk));
751 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
752 IS_UDPLITE(sk));
753 }
754
755 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
756 skb1 = NULL;
757 }
758 if (unlikely(skb1))
759 kfree_skb(skb1);
760 }
761 /*
762 * Note: called only from the BH handler context,
763 * so we don't need to lock the hashes.
764 */
765 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
766 const struct in6_addr *saddr, const struct in6_addr *daddr,
767 struct udp_table *udptable)
768 {
769 struct sock *sk, *stack[256 / sizeof(struct sock *)];
770 const struct udphdr *uh = udp_hdr(skb);
771 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
772 int dif;
773 unsigned int i, count = 0;
774
775 spin_lock(&hslot->lock);
776 sk = sk_nulls_head(&hslot->head);
777 dif = inet6_iif(skb);
778 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
779 while (sk) {
780 stack[count++] = sk;
781 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
782 uh->source, saddr, dif);
783 if (unlikely(count == ARRAY_SIZE(stack))) {
784 if (!sk)
785 break;
786 flush_stack(stack, count, skb, ~0);
787 count = 0;
788 }
789 }
790 /*
791 * before releasing the lock, we must take reference on sockets
792 */
793 for (i = 0; i < count; i++)
794 sock_hold(stack[i]);
795
796 spin_unlock(&hslot->lock);
797
798 if (count) {
799 flush_stack(stack, count, skb, count - 1);
800
801 for (i = 0; i < count; i++)
802 sock_put(stack[i]);
803 } else {
804 kfree_skb(skb);
805 }
806 return 0;
807 }
808
809 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
810 int proto)
811 {
812 struct net *net = dev_net(skb->dev);
813 struct sock *sk;
814 struct udphdr *uh;
815 const struct in6_addr *saddr, *daddr;
816 u32 ulen = 0;
817
818 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
819 goto discard;
820
821 saddr = &ipv6_hdr(skb)->saddr;
822 daddr = &ipv6_hdr(skb)->daddr;
823 uh = udp_hdr(skb);
824
825 ulen = ntohs(uh->len);
826 if (ulen > skb->len)
827 goto short_packet;
828
829 if (proto == IPPROTO_UDP) {
830 /* UDP validates ulen. */
831
832 /* Check for jumbo payload */
833 if (ulen == 0)
834 ulen = skb->len;
835
836 if (ulen < sizeof(*uh))
837 goto short_packet;
838
839 if (ulen < skb->len) {
840 if (pskb_trim_rcsum(skb, ulen))
841 goto short_packet;
842 saddr = &ipv6_hdr(skb)->saddr;
843 daddr = &ipv6_hdr(skb)->daddr;
844 uh = udp_hdr(skb);
845 }
846 }
847
848 if (udp6_csum_init(skb, uh, proto))
849 goto csum_error;
850
851 /*
852 * Multicast receive code
853 */
854 if (ipv6_addr_is_multicast(daddr))
855 return __udp6_lib_mcast_deliver(net, skb,
856 saddr, daddr, udptable);
857
858 /* Unicast */
859
860 /*
861 * check socket cache ... must talk to Alan about his plans
862 * for sock caches... i'll skip this for now.
863 */
864 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
865 if (sk != NULL) {
866 int ret;
867
868 ret = udpv6_queue_rcv_skb(sk, skb);
869 sock_put(sk);
870
871 /* a return value > 0 means to resubmit the input, but
872 * it wants the return to be -protocol, or 0
873 */
874 if (ret > 0)
875 return -ret;
876
877 return 0;
878 }
879
880 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
881 goto discard;
882
883 if (udp_lib_checksum_complete(skb))
884 goto csum_error;
885
886 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
887 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
888
889 kfree_skb(skb);
890 return 0;
891
892 short_packet:
893 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
894 proto == IPPROTO_UDPLITE ? "-Lite" : "",
895 saddr,
896 ntohs(uh->source),
897 ulen,
898 skb->len,
899 daddr,
900 ntohs(uh->dest));
901 goto discard;
902 csum_error:
903 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
904 discard:
905 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
906 kfree_skb(skb);
907 return 0;
908 }
909
910 static __inline__ int udpv6_rcv(struct sk_buff *skb)
911 {
912 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
913 }
914
915 /*
916 * Throw away all pending data and cancel the corking. Socket is locked.
917 */
918 static void udp_v6_flush_pending_frames(struct sock *sk)
919 {
920 struct udp_sock *up = udp_sk(sk);
921
922 if (up->pending == AF_INET)
923 udp_flush_pending_frames(sk);
924 else if (up->pending) {
925 up->len = 0;
926 up->pending = 0;
927 ip6_flush_pending_frames(sk);
928 }
929 }
930
931 /**
932 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
933 * @sk: socket we are sending on
934 * @skb: sk_buff containing the filled-in UDP header
935 * (checksum field must be zeroed out)
936 */
937 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
938 const struct in6_addr *saddr,
939 const struct in6_addr *daddr, int len)
940 {
941 unsigned int offset;
942 struct udphdr *uh = udp_hdr(skb);
943 __wsum csum = 0;
944
945 if (skb_queue_len(&sk->sk_write_queue) == 1) {
946 /* Only one fragment on the socket. */
947 skb->csum_start = skb_transport_header(skb) - skb->head;
948 skb->csum_offset = offsetof(struct udphdr, check);
949 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
950 } else {
951 /*
952 * HW-checksum won't work as there are two or more
953 * fragments on the socket so that all csums of sk_buffs
954 * should be together
955 */
956 offset = skb_transport_offset(skb);
957 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
958
959 skb->ip_summed = CHECKSUM_NONE;
960
961 skb_queue_walk(&sk->sk_write_queue, skb) {
962 csum = csum_add(csum, skb->csum);
963 }
964
965 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
966 csum);
967 if (uh->check == 0)
968 uh->check = CSUM_MANGLED_0;
969 }
970 }
971
972 /*
973 * Sending
974 */
975
976 static int udp_v6_push_pending_frames(struct sock *sk)
977 {
978 struct sk_buff *skb;
979 struct udphdr *uh;
980 struct udp_sock *up = udp_sk(sk);
981 struct inet_sock *inet = inet_sk(sk);
982 struct flowi6 *fl6;
983 int err = 0;
984 int is_udplite = IS_UDPLITE(sk);
985 __wsum csum = 0;
986
987 if (up->pending == AF_INET)
988 return udp_push_pending_frames(sk);
989
990 fl6 = &inet->cork.fl.u.ip6;
991
992 /* Grab the skbuff where UDP header space exists. */
993 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
994 goto out;
995
996 /*
997 * Create a UDP header
998 */
999 uh = udp_hdr(skb);
1000 uh->source = fl6->fl6_sport;
1001 uh->dest = fl6->fl6_dport;
1002 uh->len = htons(up->len);
1003 uh->check = 0;
1004
1005 if (is_udplite)
1006 csum = udplite_csum_outgoing(sk, skb);
1007 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1008 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
1009 up->len);
1010 goto send;
1011 } else
1012 csum = udp_csum_outgoing(sk, skb);
1013
1014 /* add protocol-dependent pseudo-header */
1015 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1016 up->len, fl6->flowi6_proto, csum);
1017 if (uh->check == 0)
1018 uh->check = CSUM_MANGLED_0;
1019
1020 send:
1021 err = ip6_push_pending_frames(sk);
1022 if (err) {
1023 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1024 UDP6_INC_STATS_USER(sock_net(sk),
1025 UDP_MIB_SNDBUFERRORS, is_udplite);
1026 err = 0;
1027 }
1028 } else
1029 UDP6_INC_STATS_USER(sock_net(sk),
1030 UDP_MIB_OUTDATAGRAMS, is_udplite);
1031 out:
1032 up->len = 0;
1033 up->pending = 0;
1034 return err;
1035 }
1036
1037 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1038 struct msghdr *msg, size_t len)
1039 {
1040 struct ipv6_txoptions opt_space;
1041 struct udp_sock *up = udp_sk(sk);
1042 struct inet_sock *inet = inet_sk(sk);
1043 struct ipv6_pinfo *np = inet6_sk(sk);
1044 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1045 struct in6_addr *daddr, *final_p, final;
1046 struct ipv6_txoptions *opt = NULL;
1047 struct ip6_flowlabel *flowlabel = NULL;
1048 struct flowi6 fl6;
1049 struct dst_entry *dst;
1050 int addr_len = msg->msg_namelen;
1051 int ulen = len;
1052 int hlimit = -1;
1053 int tclass = -1;
1054 int dontfrag = -1;
1055 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1056 int err;
1057 int connected = 0;
1058 int is_udplite = IS_UDPLITE(sk);
1059 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1060
1061 /* destination address check */
1062 if (sin6) {
1063 if (addr_len < offsetof(struct sockaddr, sa_data))
1064 return -EINVAL;
1065
1066 switch (sin6->sin6_family) {
1067 case AF_INET6:
1068 if (addr_len < SIN6_LEN_RFC2133)
1069 return -EINVAL;
1070 daddr = &sin6->sin6_addr;
1071 break;
1072 case AF_INET:
1073 goto do_udp_sendmsg;
1074 case AF_UNSPEC:
1075 msg->msg_name = sin6 = NULL;
1076 msg->msg_namelen = addr_len = 0;
1077 daddr = NULL;
1078 break;
1079 default:
1080 return -EINVAL;
1081 }
1082 } else if (!up->pending) {
1083 if (sk->sk_state != TCP_ESTABLISHED)
1084 return -EDESTADDRREQ;
1085 daddr = &sk->sk_v6_daddr;
1086 } else
1087 daddr = NULL;
1088
1089 if (daddr) {
1090 if (ipv6_addr_v4mapped(daddr)) {
1091 struct sockaddr_in sin;
1092 sin.sin_family = AF_INET;
1093 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1094 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1095 msg->msg_name = &sin;
1096 msg->msg_namelen = sizeof(sin);
1097 do_udp_sendmsg:
1098 if (__ipv6_only_sock(sk))
1099 return -ENETUNREACH;
1100 return udp_sendmsg(iocb, sk, msg, len);
1101 }
1102 }
1103
1104 if (up->pending == AF_INET)
1105 return udp_sendmsg(iocb, sk, msg, len);
1106
1107 /* Rough check on arithmetic overflow,
1108 better check is made in ip6_append_data().
1109 */
1110 if (len > INT_MAX - sizeof(struct udphdr))
1111 return -EMSGSIZE;
1112
1113 if (up->pending) {
1114 /*
1115 * There are pending frames.
1116 * The socket lock must be held while it's corked.
1117 */
1118 lock_sock(sk);
1119 if (likely(up->pending)) {
1120 if (unlikely(up->pending != AF_INET6)) {
1121 release_sock(sk);
1122 return -EAFNOSUPPORT;
1123 }
1124 dst = NULL;
1125 goto do_append_data;
1126 }
1127 release_sock(sk);
1128 }
1129 ulen += sizeof(struct udphdr);
1130
1131 memset(&fl6, 0, sizeof(fl6));
1132
1133 if (sin6) {
1134 if (sin6->sin6_port == 0)
1135 return -EINVAL;
1136
1137 fl6.fl6_dport = sin6->sin6_port;
1138 daddr = &sin6->sin6_addr;
1139
1140 if (np->sndflow) {
1141 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1142 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1143 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1144 if (flowlabel == NULL)
1145 return -EINVAL;
1146 daddr = &flowlabel->dst;
1147 }
1148 }
1149
1150 /*
1151 * Otherwise it will be difficult to maintain
1152 * sk->sk_dst_cache.
1153 */
1154 if (sk->sk_state == TCP_ESTABLISHED &&
1155 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1156 daddr = &sk->sk_v6_daddr;
1157
1158 if (addr_len >= sizeof(struct sockaddr_in6) &&
1159 sin6->sin6_scope_id &&
1160 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1161 fl6.flowi6_oif = sin6->sin6_scope_id;
1162 } else {
1163 if (sk->sk_state != TCP_ESTABLISHED)
1164 return -EDESTADDRREQ;
1165
1166 fl6.fl6_dport = inet->inet_dport;
1167 daddr = &sk->sk_v6_daddr;
1168 fl6.flowlabel = np->flow_label;
1169 connected = 1;
1170 }
1171
1172 if (!fl6.flowi6_oif)
1173 fl6.flowi6_oif = sk->sk_bound_dev_if;
1174
1175 if (!fl6.flowi6_oif)
1176 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1177
1178 fl6.flowi6_mark = sk->sk_mark;
1179
1180 if (msg->msg_controllen) {
1181 opt = &opt_space;
1182 memset(opt, 0, sizeof(struct ipv6_txoptions));
1183 opt->tot_len = sizeof(*opt);
1184
1185 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1186 &hlimit, &tclass, &dontfrag);
1187 if (err < 0) {
1188 fl6_sock_release(flowlabel);
1189 return err;
1190 }
1191 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1192 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1193 if (flowlabel == NULL)
1194 return -EINVAL;
1195 }
1196 if (!(opt->opt_nflen|opt->opt_flen))
1197 opt = NULL;
1198 connected = 0;
1199 }
1200 if (opt == NULL)
1201 opt = np->opt;
1202 if (flowlabel)
1203 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1204 opt = ipv6_fixup_options(&opt_space, opt);
1205
1206 fl6.flowi6_proto = sk->sk_protocol;
1207 if (!ipv6_addr_any(daddr))
1208 fl6.daddr = *daddr;
1209 else
1210 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1211 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1212 fl6.saddr = np->saddr;
1213 fl6.fl6_sport = inet->inet_sport;
1214
1215 final_p = fl6_update_dst(&fl6, opt, &final);
1216 if (final_p)
1217 connected = 0;
1218
1219 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1220 fl6.flowi6_oif = np->mcast_oif;
1221 connected = 0;
1222 } else if (!fl6.flowi6_oif)
1223 fl6.flowi6_oif = np->ucast_oif;
1224
1225 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1226
1227 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1228 if (IS_ERR(dst)) {
1229 err = PTR_ERR(dst);
1230 dst = NULL;
1231 goto out;
1232 }
1233
1234 if (hlimit < 0) {
1235 if (ipv6_addr_is_multicast(&fl6.daddr))
1236 hlimit = np->mcast_hops;
1237 else
1238 hlimit = np->hop_limit;
1239 if (hlimit < 0)
1240 hlimit = ip6_dst_hoplimit(dst);
1241 }
1242
1243 if (tclass < 0)
1244 tclass = np->tclass;
1245
1246 if (dontfrag < 0)
1247 dontfrag = np->dontfrag;
1248
1249 if (msg->msg_flags&MSG_CONFIRM)
1250 goto do_confirm;
1251 back_from_confirm:
1252
1253 lock_sock(sk);
1254 if (unlikely(up->pending)) {
1255 /* The socket is already corked while preparing it. */
1256 /* ... which is an evident application bug. --ANK */
1257 release_sock(sk);
1258
1259 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1260 err = -EINVAL;
1261 goto out;
1262 }
1263
1264 up->pending = AF_INET6;
1265
1266 do_append_data:
1267 up->len += ulen;
1268 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1269 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1270 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1271 (struct rt6_info*)dst,
1272 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1273 if (err)
1274 udp_v6_flush_pending_frames(sk);
1275 else if (!corkreq)
1276 err = udp_v6_push_pending_frames(sk);
1277 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1278 up->pending = 0;
1279
1280 if (dst) {
1281 if (connected) {
1282 ip6_dst_store(sk, dst,
1283 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1284 &sk->sk_v6_daddr : NULL,
1285 #ifdef CONFIG_IPV6_SUBTREES
1286 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1287 &np->saddr :
1288 #endif
1289 NULL);
1290 } else {
1291 dst_release(dst);
1292 }
1293 dst = NULL;
1294 }
1295
1296 if (err > 0)
1297 err = np->recverr ? net_xmit_errno(err) : 0;
1298 release_sock(sk);
1299 out:
1300 dst_release(dst);
1301 fl6_sock_release(flowlabel);
1302 if (!err)
1303 return len;
1304 /*
1305 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1306 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1307 * we don't have a good statistic (IpOutDiscards but it can be too many
1308 * things). We could add another new stat but at least for now that
1309 * seems like overkill.
1310 */
1311 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1312 UDP6_INC_STATS_USER(sock_net(sk),
1313 UDP_MIB_SNDBUFERRORS, is_udplite);
1314 }
1315 return err;
1316
1317 do_confirm:
1318 dst_confirm(dst);
1319 if (!(msg->msg_flags&MSG_PROBE) || len)
1320 goto back_from_confirm;
1321 err = 0;
1322 goto out;
1323 }
1324
1325 void udpv6_destroy_sock(struct sock *sk)
1326 {
1327 struct udp_sock *up = udp_sk(sk);
1328 lock_sock(sk);
1329 udp_v6_flush_pending_frames(sk);
1330 release_sock(sk);
1331
1332 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1333 void (*encap_destroy)(struct sock *sk);
1334 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1335 if (encap_destroy)
1336 encap_destroy(sk);
1337 }
1338
1339 inet6_destroy_sock(sk);
1340 }
1341
1342 /*
1343 * Socket option code for UDP
1344 */
1345 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1346 char __user *optval, unsigned int optlen)
1347 {
1348 if (level == SOL_UDP || level == SOL_UDPLITE)
1349 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1350 udp_v6_push_pending_frames);
1351 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1352 }
1353
1354 #ifdef CONFIG_COMPAT
1355 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1356 char __user *optval, unsigned int optlen)
1357 {
1358 if (level == SOL_UDP || level == SOL_UDPLITE)
1359 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1360 udp_v6_push_pending_frames);
1361 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1362 }
1363 #endif
1364
1365 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1366 char __user *optval, int __user *optlen)
1367 {
1368 if (level == SOL_UDP || level == SOL_UDPLITE)
1369 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1370 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1371 }
1372
1373 #ifdef CONFIG_COMPAT
1374 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1375 char __user *optval, int __user *optlen)
1376 {
1377 if (level == SOL_UDP || level == SOL_UDPLITE)
1378 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1379 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1380 }
1381 #endif
1382
1383 static const struct inet6_protocol udpv6_protocol = {
1384 .handler = udpv6_rcv,
1385 .err_handler = udpv6_err,
1386 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1387 };
1388
1389 /* ------------------------------------------------------------------------ */
1390 #ifdef CONFIG_PROC_FS
1391 int udp6_seq_show(struct seq_file *seq, void *v)
1392 {
1393 if (v == SEQ_START_TOKEN) {
1394 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1395 } else {
1396 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1397 struct inet_sock *inet = inet_sk(v);
1398 __u16 srcp = ntohs(inet->inet_sport);
1399 __u16 destp = ntohs(inet->inet_dport);
1400 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1401 }
1402 return 0;
1403 }
1404
1405 static const struct file_operations udp6_afinfo_seq_fops = {
1406 .owner = THIS_MODULE,
1407 .open = udp_seq_open,
1408 .read = seq_read,
1409 .llseek = seq_lseek,
1410 .release = seq_release_net
1411 };
1412
1413 static struct udp_seq_afinfo udp6_seq_afinfo = {
1414 .name = "udp6",
1415 .family = AF_INET6,
1416 .udp_table = &udp_table,
1417 .seq_fops = &udp6_afinfo_seq_fops,
1418 .seq_ops = {
1419 .show = udp6_seq_show,
1420 },
1421 };
1422
1423 int __net_init udp6_proc_init(struct net *net)
1424 {
1425 return udp_proc_register(net, &udp6_seq_afinfo);
1426 }
1427
1428 void udp6_proc_exit(struct net *net) {
1429 udp_proc_unregister(net, &udp6_seq_afinfo);
1430 }
1431 #endif /* CONFIG_PROC_FS */
1432
1433 void udp_v6_clear_sk(struct sock *sk, int size)
1434 {
1435 struct inet_sock *inet = inet_sk(sk);
1436
1437 /* we do not want to clear pinet6 field, because of RCU lookups */
1438 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1439
1440 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1441 memset(&inet->pinet6 + 1, 0, size);
1442 }
1443
1444 /* ------------------------------------------------------------------------ */
1445
1446 struct proto udpv6_prot = {
1447 .name = "UDPv6",
1448 .owner = THIS_MODULE,
1449 .close = udp_lib_close,
1450 .connect = ip6_datagram_connect,
1451 .disconnect = udp_disconnect,
1452 .ioctl = udp_ioctl,
1453 .destroy = udpv6_destroy_sock,
1454 .setsockopt = udpv6_setsockopt,
1455 .getsockopt = udpv6_getsockopt,
1456 .sendmsg = udpv6_sendmsg,
1457 .recvmsg = udpv6_recvmsg,
1458 .backlog_rcv = __udpv6_queue_rcv_skb,
1459 .hash = udp_lib_hash,
1460 .unhash = udp_lib_unhash,
1461 .rehash = udp_v6_rehash,
1462 .get_port = udp_v6_get_port,
1463 .memory_allocated = &udp_memory_allocated,
1464 .sysctl_mem = sysctl_udp_mem,
1465 .sysctl_wmem = &sysctl_udp_wmem_min,
1466 .sysctl_rmem = &sysctl_udp_rmem_min,
1467 .obj_size = sizeof(struct udp6_sock),
1468 .slab_flags = SLAB_DESTROY_BY_RCU,
1469 .h.udp_table = &udp_table,
1470 #ifdef CONFIG_COMPAT
1471 .compat_setsockopt = compat_udpv6_setsockopt,
1472 .compat_getsockopt = compat_udpv6_getsockopt,
1473 #endif
1474 .clear_sk = udp_v6_clear_sk,
1475 };
1476
1477 static struct inet_protosw udpv6_protosw = {
1478 .type = SOCK_DGRAM,
1479 .protocol = IPPROTO_UDP,
1480 .prot = &udpv6_prot,
1481 .ops = &inet6_dgram_ops,
1482 .no_check = UDP_CSUM_DEFAULT,
1483 .flags = INET_PROTOSW_PERMANENT,
1484 };
1485
1486
1487 int __init udpv6_init(void)
1488 {
1489 int ret;
1490
1491 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1492 if (ret)
1493 goto out;
1494
1495 ret = inet6_register_protosw(&udpv6_protosw);
1496 if (ret)
1497 goto out_udpv6_protocol;
1498 out:
1499 return ret;
1500
1501 out_udpv6_protocol:
1502 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1503 goto out;
1504 }
1505
1506 void udpv6_exit(void)
1507 {
1508 inet6_unregister_protosw(&udpv6_protosw);
1509 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1510 }
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