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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/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/inet6_hashtables.h>
50#include <net/busy_poll.h>
51#include <net/sock_reuseport.h>
52
53#include <linux/proc_fs.h>
54#include <linux/seq_file.h>
55#include <trace/events/skb.h>
56#include "udp_impl.h"
57
58static u32 udp6_ehashfn(const struct net *net,
59 const struct in6_addr *laddr,
60 const u16 lport,
61 const struct in6_addr *faddr,
62 const __be16 fport)
63{
64 static u32 udp6_ehash_secret __read_mostly;
65 static u32 udp_ipv6_hash_secret __read_mostly;
66
67 u32 lhash, fhash;
68
69 net_get_random_once(&udp6_ehash_secret,
70 sizeof(udp6_ehash_secret));
71 net_get_random_once(&udp_ipv6_hash_secret,
72 sizeof(udp_ipv6_hash_secret));
73
74 lhash = (__force u32)laddr->s6_addr32[3];
75 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
76
77 return __inet6_ehashfn(lhash, lport, fhash, fport,
78 udp_ipv6_hash_secret + net_hash_mix(net));
79}
80
81static u32 udp6_portaddr_hash(const struct net *net,
82 const struct in6_addr *addr6,
83 unsigned int port)
84{
85 unsigned int hash, mix = net_hash_mix(net);
86
87 if (ipv6_addr_any(addr6))
88 hash = jhash_1word(0, mix);
89 else if (ipv6_addr_v4mapped(addr6))
90 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
91 else
92 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
93
94 return hash ^ port;
95}
96
97int udp_v6_get_port(struct sock *sk, unsigned short snum)
98{
99 unsigned int hash2_nulladdr =
100 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
101 unsigned int hash2_partial =
102 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
103
104 /* precompute partial secondary hash */
105 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
106 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
107}
108
109static void udp_v6_rehash(struct sock *sk)
110{
111 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
112 &sk->sk_v6_rcv_saddr,
113 inet_sk(sk)->inet_num);
114
115 udp_lib_rehash(sk, new_hash);
116}
117
118static inline int compute_score(struct sock *sk, struct net *net,
119 unsigned short hnum,
120 const struct in6_addr *saddr, __be16 sport,
121 const struct in6_addr *daddr, __be16 dport,
122 int dif)
123{
124 int score;
125 struct inet_sock *inet;
126
127 if (!net_eq(sock_net(sk), net) ||
128 udp_sk(sk)->udp_port_hash != hnum ||
129 sk->sk_family != PF_INET6)
130 return -1;
131
132 score = 0;
133 inet = inet_sk(sk);
134
135 if (inet->inet_dport) {
136 if (inet->inet_dport != sport)
137 return -1;
138 score++;
139 }
140
141 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
142 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
143 return -1;
144 score++;
145 }
146
147 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
148 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
149 return -1;
150 score++;
151 }
152
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158
159 if (sk->sk_incoming_cpu == raw_smp_processor_id())
160 score++;
161
162 return score;
163}
164
165static inline int compute_score2(struct sock *sk, struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr,
168 unsigned short hnum, int dif)
169{
170 int score;
171 struct inet_sock *inet;
172
173 if (!net_eq(sock_net(sk), net) ||
174 udp_sk(sk)->udp_port_hash != hnum ||
175 sk->sk_family != PF_INET6)
176 return -1;
177
178 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
179 return -1;
180
181 score = 0;
182 inet = inet_sk(sk);
183
184 if (inet->inet_dport) {
185 if (inet->inet_dport != sport)
186 return -1;
187 score++;
188 }
189
190 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
191 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
192 return -1;
193 score++;
194 }
195
196 if (sk->sk_bound_dev_if) {
197 if (sk->sk_bound_dev_if != dif)
198 return -1;
199 score++;
200 }
201
202 if (sk->sk_incoming_cpu == raw_smp_processor_id())
203 score++;
204
205 return score;
206}
207
208/* called with read_rcu_lock() */
209static struct sock *udp6_lib_lookup2(struct net *net,
210 const struct in6_addr *saddr, __be16 sport,
211 const struct in6_addr *daddr, unsigned int hnum, int dif,
212 struct udp_hslot *hslot2, unsigned int slot2,
213 struct sk_buff *skb)
214{
215 struct sock *sk, *result;
216 struct hlist_nulls_node *node;
217 int score, badness, matches = 0, reuseport = 0;
218 bool select_ok = true;
219 u32 hash = 0;
220
221begin:
222 result = NULL;
223 badness = -1;
224 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
225 score = compute_score2(sk, net, saddr, sport,
226 daddr, hnum, dif);
227 if (score > badness) {
228 result = sk;
229 badness = score;
230 reuseport = sk->sk_reuseport;
231 if (reuseport) {
232 hash = udp6_ehashfn(net, daddr, hnum,
233 saddr, sport);
234 if (select_ok) {
235 struct sock *sk2;
236
237 sk2 = reuseport_select_sock(sk, hash, skb,
238 sizeof(struct udphdr));
239 if (sk2) {
240 result = sk2;
241 select_ok = false;
242 goto found;
243 }
244 }
245 matches = 1;
246 }
247 } else if (score == badness && reuseport) {
248 matches++;
249 if (reciprocal_scale(hash, matches) == 0)
250 result = sk;
251 hash = next_pseudo_random32(hash);
252 }
253 }
254 /*
255 * if the nulls value we got at the end of this lookup is
256 * not the expected one, we must restart lookup.
257 * We probably met an item that was moved to another chain.
258 */
259 if (get_nulls_value(node) != slot2)
260 goto begin;
261
262 if (result) {
263found:
264 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
265 result = NULL;
266 else if (unlikely(compute_score2(result, net, saddr, sport,
267 daddr, hnum, dif) < badness)) {
268 sock_put(result);
269 goto begin;
270 }
271 }
272 return result;
273}
274
275struct sock *__udp6_lib_lookup(struct net *net,
276 const struct in6_addr *saddr, __be16 sport,
277 const struct in6_addr *daddr, __be16 dport,
278 int dif, struct udp_table *udptable,
279 struct sk_buff *skb)
280{
281 struct sock *sk, *result;
282 struct hlist_nulls_node *node;
283 unsigned short hnum = ntohs(dport);
284 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
285 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
286 int score, badness, matches = 0, reuseport = 0;
287 bool select_ok = true;
288 u32 hash = 0;
289
290 rcu_read_lock();
291 if (hslot->count > 10) {
292 hash2 = udp6_portaddr_hash(net, daddr, hnum);
293 slot2 = hash2 & udptable->mask;
294 hslot2 = &udptable->hash2[slot2];
295 if (hslot->count < hslot2->count)
296 goto begin;
297
298 result = udp6_lib_lookup2(net, saddr, sport,
299 daddr, hnum, dif,
300 hslot2, slot2, skb);
301 if (!result) {
302 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
303 slot2 = hash2 & udptable->mask;
304 hslot2 = &udptable->hash2[slot2];
305 if (hslot->count < hslot2->count)
306 goto begin;
307
308 result = udp6_lib_lookup2(net, saddr, sport,
309 &in6addr_any, hnum, dif,
310 hslot2, slot2, skb);
311 }
312 rcu_read_unlock();
313 return result;
314 }
315begin:
316 result = NULL;
317 badness = -1;
318 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
319 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
320 if (score > badness) {
321 result = sk;
322 badness = score;
323 reuseport = sk->sk_reuseport;
324 if (reuseport) {
325 hash = udp6_ehashfn(net, daddr, hnum,
326 saddr, sport);
327 if (select_ok) {
328 struct sock *sk2;
329
330 sk2 = reuseport_select_sock(sk, hash, skb,
331 sizeof(struct udphdr));
332 if (sk2) {
333 result = sk2;
334 select_ok = false;
335 goto found;
336 }
337 }
338 matches = 1;
339 }
340 } else if (score == badness && reuseport) {
341 matches++;
342 if (reciprocal_scale(hash, matches) == 0)
343 result = sk;
344 hash = next_pseudo_random32(hash);
345 }
346 }
347 /*
348 * if the nulls value we got at the end of this lookup is
349 * not the expected one, we must restart lookup.
350 * We probably met an item that was moved to another chain.
351 */
352 if (get_nulls_value(node) != slot)
353 goto begin;
354
355 if (result) {
356found:
357 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
358 result = NULL;
359 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
360 daddr, dport, dif) < badness)) {
361 sock_put(result);
362 goto begin;
363 }
364 }
365 rcu_read_unlock();
366 return result;
367}
368EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
369
370static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
371 __be16 sport, __be16 dport,
372 struct udp_table *udptable)
373{
374 struct sock *sk;
375 const struct ipv6hdr *iph = ipv6_hdr(skb);
376
377 sk = skb_steal_sock(skb);
378 if (unlikely(sk))
379 return sk;
380 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
381 &iph->daddr, dport, inet6_iif(skb),
382 udptable, skb);
383}
384
385struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
386 const struct in6_addr *daddr, __be16 dport, int dif)
387{
388 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
389}
390EXPORT_SYMBOL_GPL(udp6_lib_lookup);
391
392/*
393 * This should be easy, if there is something there we
394 * return it, otherwise we block.
395 */
396
397int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
398 int noblock, int flags, int *addr_len)
399{
400 struct ipv6_pinfo *np = inet6_sk(sk);
401 struct inet_sock *inet = inet_sk(sk);
402 struct sk_buff *skb;
403 unsigned int ulen, copied;
404 int peeked, off = 0;
405 int err;
406 int is_udplite = IS_UDPLITE(sk);
407 bool checksum_valid = false;
408 int is_udp4;
409 bool slow;
410
411 if (flags & MSG_ERRQUEUE)
412 return ipv6_recv_error(sk, msg, len, addr_len);
413
414 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
415 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
416
417try_again:
418 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
419 &peeked, &off, &err);
420 if (!skb)
421 goto out;
422
423 ulen = skb->len - sizeof(struct udphdr);
424 copied = len;
425 if (copied > ulen)
426 copied = ulen;
427 else if (copied < ulen)
428 msg->msg_flags |= MSG_TRUNC;
429
430 is_udp4 = (skb->protocol == htons(ETH_P_IP));
431
432 /*
433 * If checksum is needed at all, try to do it while copying the
434 * data. If the data is truncated, or if we only want a partial
435 * coverage checksum (UDP-Lite), do it before the copy.
436 */
437
438 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
439 checksum_valid = !udp_lib_checksum_complete(skb);
440 if (!checksum_valid)
441 goto csum_copy_err;
442 }
443
444 if (checksum_valid || skb_csum_unnecessary(skb))
445 err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
446 msg, copied);
447 else {
448 err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
449 if (err == -EINVAL)
450 goto csum_copy_err;
451 }
452 if (unlikely(err)) {
453 trace_kfree_skb(skb, udpv6_recvmsg);
454 if (!peeked) {
455 atomic_inc(&sk->sk_drops);
456 if (is_udp4)
457 UDP_INC_STATS_USER(sock_net(sk),
458 UDP_MIB_INERRORS,
459 is_udplite);
460 else
461 UDP6_INC_STATS_USER(sock_net(sk),
462 UDP_MIB_INERRORS,
463 is_udplite);
464 }
465 goto out_free;
466 }
467 if (!peeked) {
468 if (is_udp4)
469 UDP_INC_STATS_USER(sock_net(sk),
470 UDP_MIB_INDATAGRAMS, is_udplite);
471 else
472 UDP6_INC_STATS_USER(sock_net(sk),
473 UDP_MIB_INDATAGRAMS, is_udplite);
474 }
475
476 sock_recv_ts_and_drops(msg, sk, skb);
477
478 /* Copy the address. */
479 if (msg->msg_name) {
480 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
481 sin6->sin6_family = AF_INET6;
482 sin6->sin6_port = udp_hdr(skb)->source;
483 sin6->sin6_flowinfo = 0;
484
485 if (is_udp4) {
486 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
487 &sin6->sin6_addr);
488 sin6->sin6_scope_id = 0;
489 } else {
490 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
491 sin6->sin6_scope_id =
492 ipv6_iface_scope_id(&sin6->sin6_addr,
493 inet6_iif(skb));
494 }
495 *addr_len = sizeof(*sin6);
496 }
497
498 if (np->rxopt.all)
499 ip6_datagram_recv_common_ctl(sk, msg, skb);
500
501 if (is_udp4) {
502 if (inet->cmsg_flags)
503 ip_cmsg_recv(msg, skb);
504 } else {
505 if (np->rxopt.all)
506 ip6_datagram_recv_specific_ctl(sk, msg, skb);
507 }
508
509 err = copied;
510 if (flags & MSG_TRUNC)
511 err = ulen;
512
513out_free:
514 skb_free_datagram_locked(sk, skb);
515out:
516 return err;
517
518csum_copy_err:
519 slow = lock_sock_fast(sk);
520 if (!skb_kill_datagram(sk, skb, flags)) {
521 if (is_udp4) {
522 UDP_INC_STATS_USER(sock_net(sk),
523 UDP_MIB_CSUMERRORS, is_udplite);
524 UDP_INC_STATS_USER(sock_net(sk),
525 UDP_MIB_INERRORS, is_udplite);
526 } else {
527 UDP6_INC_STATS_USER(sock_net(sk),
528 UDP_MIB_CSUMERRORS, is_udplite);
529 UDP6_INC_STATS_USER(sock_net(sk),
530 UDP_MIB_INERRORS, is_udplite);
531 }
532 }
533 unlock_sock_fast(sk, slow);
534
535 /* starting over for a new packet, but check if we need to yield */
536 cond_resched();
537 msg->msg_flags &= ~MSG_TRUNC;
538 goto try_again;
539}
540
541void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
542 u8 type, u8 code, int offset, __be32 info,
543 struct udp_table *udptable)
544{
545 struct ipv6_pinfo *np;
546 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
547 const struct in6_addr *saddr = &hdr->saddr;
548 const struct in6_addr *daddr = &hdr->daddr;
549 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
550 struct sock *sk;
551 int harderr;
552 int err;
553 struct net *net = dev_net(skb->dev);
554
555 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
556 inet6_iif(skb), udptable, skb);
557 if (!sk) {
558 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
559 ICMP6_MIB_INERRORS);
560 return;
561 }
562
563 harderr = icmpv6_err_convert(type, code, &err);
564 np = inet6_sk(sk);
565
566 if (type == ICMPV6_PKT_TOOBIG) {
567 if (!ip6_sk_accept_pmtu(sk))
568 goto out;
569 ip6_sk_update_pmtu(skb, sk, info);
570 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
571 harderr = 1;
572 }
573 if (type == NDISC_REDIRECT) {
574 ip6_sk_redirect(skb, sk);
575 goto out;
576 }
577
578 if (!np->recverr) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
582 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
583 }
584
585 sk->sk_err = err;
586 sk->sk_error_report(sk);
587out:
588 sock_put(sk);
589}
590
591static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
592{
593 int rc;
594
595 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
596 sock_rps_save_rxhash(sk, skb);
597 sk_mark_napi_id(sk, skb);
598 sk_incoming_cpu_update(sk);
599 }
600
601 rc = sock_queue_rcv_skb(sk, skb);
602 if (rc < 0) {
603 int is_udplite = IS_UDPLITE(sk);
604
605 /* Note that an ENOMEM error is charged twice */
606 if (rc == -ENOMEM)
607 UDP6_INC_STATS_BH(sock_net(sk),
608 UDP_MIB_RCVBUFERRORS, is_udplite);
609 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
610 kfree_skb(skb);
611 return -1;
612 }
613 return 0;
614}
615
616static __inline__ void udpv6_err(struct sk_buff *skb,
617 struct inet6_skb_parm *opt, u8 type,
618 u8 code, int offset, __be32 info)
619{
620 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
621}
622
623static struct static_key udpv6_encap_needed __read_mostly;
624void udpv6_encap_enable(void)
625{
626 if (!static_key_enabled(&udpv6_encap_needed))
627 static_key_slow_inc(&udpv6_encap_needed);
628}
629EXPORT_SYMBOL(udpv6_encap_enable);
630
631int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
632{
633 struct udp_sock *up = udp_sk(sk);
634 int rc;
635 int is_udplite = IS_UDPLITE(sk);
636
637 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
638 goto drop;
639
640 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
641 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
642
643 /*
644 * This is an encapsulation socket so pass the skb to
645 * the socket's udp_encap_rcv() hook. Otherwise, just
646 * fall through and pass this up the UDP socket.
647 * up->encap_rcv() returns the following value:
648 * =0 if skb was successfully passed to the encap
649 * handler or was discarded by it.
650 * >0 if skb should be passed on to UDP.
651 * <0 if skb should be resubmitted as proto -N
652 */
653
654 /* if we're overly short, let UDP handle it */
655 encap_rcv = ACCESS_ONCE(up->encap_rcv);
656 if (skb->len > sizeof(struct udphdr) && encap_rcv) {
657 int ret;
658
659 /* Verify checksum before giving to encap */
660 if (udp_lib_checksum_complete(skb))
661 goto csum_error;
662
663 ret = encap_rcv(sk, skb);
664 if (ret <= 0) {
665 UDP_INC_STATS_BH(sock_net(sk),
666 UDP_MIB_INDATAGRAMS,
667 is_udplite);
668 return -ret;
669 }
670 }
671
672 /* FALLTHROUGH -- it's a UDP Packet */
673 }
674
675 /*
676 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
677 */
678 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
679
680 if (up->pcrlen == 0) { /* full coverage was set */
681 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
682 UDP_SKB_CB(skb)->cscov, skb->len);
683 goto drop;
684 }
685 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
686 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
687 UDP_SKB_CB(skb)->cscov, up->pcrlen);
688 goto drop;
689 }
690 }
691
692 if (rcu_access_pointer(sk->sk_filter)) {
693 if (udp_lib_checksum_complete(skb))
694 goto csum_error;
695 }
696
697 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
698 UDP6_INC_STATS_BH(sock_net(sk),
699 UDP_MIB_RCVBUFERRORS, is_udplite);
700 goto drop;
701 }
702
703 skb_dst_drop(skb);
704
705 bh_lock_sock(sk);
706 rc = 0;
707 if (!sock_owned_by_user(sk))
708 rc = __udpv6_queue_rcv_skb(sk, skb);
709 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
710 bh_unlock_sock(sk);
711 goto drop;
712 }
713 bh_unlock_sock(sk);
714
715 return rc;
716
717csum_error:
718 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
719drop:
720 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
721 atomic_inc(&sk->sk_drops);
722 kfree_skb(skb);
723 return -1;
724}
725
726static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
727 __be16 loc_port, const struct in6_addr *loc_addr,
728 __be16 rmt_port, const struct in6_addr *rmt_addr,
729 int dif, unsigned short hnum)
730{
731 struct inet_sock *inet = inet_sk(sk);
732
733 if (!net_eq(sock_net(sk), net))
734 return false;
735
736 if (udp_sk(sk)->udp_port_hash != hnum ||
737 sk->sk_family != PF_INET6 ||
738 (inet->inet_dport && inet->inet_dport != rmt_port) ||
739 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
740 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
741 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
742 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
743 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
744 return false;
745 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
746 return false;
747 return true;
748}
749
750static void flush_stack(struct sock **stack, unsigned int count,
751 struct sk_buff *skb, unsigned int final)
752{
753 struct sk_buff *skb1 = NULL;
754 struct sock *sk;
755 unsigned int i;
756
757 for (i = 0; i < count; i++) {
758 sk = stack[i];
759 if (likely(!skb1))
760 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
761 if (!skb1) {
762 atomic_inc(&sk->sk_drops);
763 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
764 IS_UDPLITE(sk));
765 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
766 IS_UDPLITE(sk));
767 }
768
769 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
770 skb1 = NULL;
771 sock_put(sk);
772 }
773 if (unlikely(skb1))
774 kfree_skb(skb1);
775}
776
777static void udp6_csum_zero_error(struct sk_buff *skb)
778{
779 /* RFC 2460 section 8.1 says that we SHOULD log
780 * this error. Well, it is reasonable.
781 */
782 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
783 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
784 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
785}
786
787/*
788 * Note: called only from the BH handler context,
789 * so we don't need to lock the hashes.
790 */
791static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
792 const struct in6_addr *saddr, const struct in6_addr *daddr,
793 struct udp_table *udptable, int proto)
794{
795 struct sock *sk, *stack[256 / sizeof(struct sock *)];
796 const struct udphdr *uh = udp_hdr(skb);
797 struct hlist_nulls_node *node;
798 unsigned short hnum = ntohs(uh->dest);
799 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
800 int dif = inet6_iif(skb);
801 unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
802 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
803 bool inner_flushed = false;
804
805 if (use_hash2) {
806 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
807 udp_table.mask;
808 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
809start_lookup:
810 hslot = &udp_table.hash2[hash2];
811 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
812 }
813
814 spin_lock(&hslot->lock);
815 sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
816 if (__udp_v6_is_mcast_sock(net, sk,
817 uh->dest, daddr,
818 uh->source, saddr,
819 dif, hnum) &&
820 /* If zero checksum and no_check is not on for
821 * the socket then skip it.
822 */
823 (uh->check || udp_sk(sk)->no_check6_rx)) {
824 if (unlikely(count == ARRAY_SIZE(stack))) {
825 flush_stack(stack, count, skb, ~0);
826 inner_flushed = true;
827 count = 0;
828 }
829 stack[count++] = sk;
830 sock_hold(sk);
831 }
832 }
833
834 spin_unlock(&hslot->lock);
835
836 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
837 if (use_hash2 && hash2 != hash2_any) {
838 hash2 = hash2_any;
839 goto start_lookup;
840 }
841
842 if (count) {
843 flush_stack(stack, count, skb, count - 1);
844 } else {
845 if (!inner_flushed)
846 UDP6_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
847 proto == IPPROTO_UDPLITE);
848 consume_skb(skb);
849 }
850 return 0;
851}
852
853int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
854 int proto)
855{
856 struct net *net = dev_net(skb->dev);
857 struct sock *sk;
858 struct udphdr *uh;
859 const struct in6_addr *saddr, *daddr;
860 u32 ulen = 0;
861
862 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
863 goto discard;
864
865 saddr = &ipv6_hdr(skb)->saddr;
866 daddr = &ipv6_hdr(skb)->daddr;
867 uh = udp_hdr(skb);
868
869 ulen = ntohs(uh->len);
870 if (ulen > skb->len)
871 goto short_packet;
872
873 if (proto == IPPROTO_UDP) {
874 /* UDP validates ulen. */
875
876 /* Check for jumbo payload */
877 if (ulen == 0)
878 ulen = skb->len;
879
880 if (ulen < sizeof(*uh))
881 goto short_packet;
882
883 if (ulen < skb->len) {
884 if (pskb_trim_rcsum(skb, ulen))
885 goto short_packet;
886 saddr = &ipv6_hdr(skb)->saddr;
887 daddr = &ipv6_hdr(skb)->daddr;
888 uh = udp_hdr(skb);
889 }
890 }
891
892 if (udp6_csum_init(skb, uh, proto))
893 goto csum_error;
894
895 /*
896 * Multicast receive code
897 */
898 if (ipv6_addr_is_multicast(daddr))
899 return __udp6_lib_mcast_deliver(net, skb,
900 saddr, daddr, udptable, proto);
901
902 /* Unicast */
903
904 /*
905 * check socket cache ... must talk to Alan about his plans
906 * for sock caches... i'll skip this for now.
907 */
908 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
909 if (sk) {
910 int ret;
911
912 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
913 sock_put(sk);
914 udp6_csum_zero_error(skb);
915 goto csum_error;
916 }
917
918 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
919 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
920 ip6_compute_pseudo);
921
922 ret = udpv6_queue_rcv_skb(sk, skb);
923 sock_put(sk);
924
925 /* a return value > 0 means to resubmit the input */
926 if (ret > 0)
927 return ret;
928
929 return 0;
930 }
931
932 if (!uh->check) {
933 udp6_csum_zero_error(skb);
934 goto csum_error;
935 }
936
937 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
938 goto discard;
939
940 if (udp_lib_checksum_complete(skb))
941 goto csum_error;
942
943 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
944 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
945
946 kfree_skb(skb);
947 return 0;
948
949short_packet:
950 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
951 proto == IPPROTO_UDPLITE ? "-Lite" : "",
952 saddr, ntohs(uh->source),
953 ulen, skb->len,
954 daddr, ntohs(uh->dest));
955 goto discard;
956csum_error:
957 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
958discard:
959 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
960 kfree_skb(skb);
961 return 0;
962}
963
964static __inline__ int udpv6_rcv(struct sk_buff *skb)
965{
966 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
967}
968
969/*
970 * Throw away all pending data and cancel the corking. Socket is locked.
971 */
972static void udp_v6_flush_pending_frames(struct sock *sk)
973{
974 struct udp_sock *up = udp_sk(sk);
975
976 if (up->pending == AF_INET)
977 udp_flush_pending_frames(sk);
978 else if (up->pending) {
979 up->len = 0;
980 up->pending = 0;
981 ip6_flush_pending_frames(sk);
982 }
983}
984
985/**
986 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
987 * @sk: socket we are sending on
988 * @skb: sk_buff containing the filled-in UDP header
989 * (checksum field must be zeroed out)
990 */
991static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
992 const struct in6_addr *saddr,
993 const struct in6_addr *daddr, int len)
994{
995 unsigned int offset;
996 struct udphdr *uh = udp_hdr(skb);
997 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
998 __wsum csum = 0;
999
1000 if (!frags) {
1001 /* Only one fragment on the socket. */
1002 skb->csum_start = skb_transport_header(skb) - skb->head;
1003 skb->csum_offset = offsetof(struct udphdr, check);
1004 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1005 } else {
1006 /*
1007 * HW-checksum won't work as there are two or more
1008 * fragments on the socket so that all csums of sk_buffs
1009 * should be together
1010 */
1011 offset = skb_transport_offset(skb);
1012 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1013
1014 skb->ip_summed = CHECKSUM_NONE;
1015
1016 do {
1017 csum = csum_add(csum, frags->csum);
1018 } while ((frags = frags->next));
1019
1020 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1021 csum);
1022 if (uh->check == 0)
1023 uh->check = CSUM_MANGLED_0;
1024 }
1025}
1026
1027/*
1028 * Sending
1029 */
1030
1031static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
1032{
1033 struct sock *sk = skb->sk;
1034 struct udphdr *uh;
1035 int err = 0;
1036 int is_udplite = IS_UDPLITE(sk);
1037 __wsum csum = 0;
1038 int offset = skb_transport_offset(skb);
1039 int len = skb->len - offset;
1040
1041 /*
1042 * Create a UDP header
1043 */
1044 uh = udp_hdr(skb);
1045 uh->source = fl6->fl6_sport;
1046 uh->dest = fl6->fl6_dport;
1047 uh->len = htons(len);
1048 uh->check = 0;
1049
1050 if (is_udplite)
1051 csum = udplite_csum(skb);
1052 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1053 skb->ip_summed = CHECKSUM_NONE;
1054 goto send;
1055 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1056 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1057 goto send;
1058 } else
1059 csum = udp_csum(skb);
1060
1061 /* add protocol-dependent pseudo-header */
1062 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1063 len, fl6->flowi6_proto, csum);
1064 if (uh->check == 0)
1065 uh->check = CSUM_MANGLED_0;
1066
1067send:
1068 err = ip6_send_skb(skb);
1069 if (err) {
1070 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1071 UDP6_INC_STATS_USER(sock_net(sk),
1072 UDP_MIB_SNDBUFERRORS, is_udplite);
1073 err = 0;
1074 }
1075 } else
1076 UDP6_INC_STATS_USER(sock_net(sk),
1077 UDP_MIB_OUTDATAGRAMS, is_udplite);
1078 return err;
1079}
1080
1081static int udp_v6_push_pending_frames(struct sock *sk)
1082{
1083 struct sk_buff *skb;
1084 struct udp_sock *up = udp_sk(sk);
1085 struct flowi6 fl6;
1086 int err = 0;
1087
1088 if (up->pending == AF_INET)
1089 return udp_push_pending_frames(sk);
1090
1091 /* ip6_finish_skb will release the cork, so make a copy of
1092 * fl6 here.
1093 */
1094 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1095
1096 skb = ip6_finish_skb(sk);
1097 if (!skb)
1098 goto out;
1099
1100 err = udp_v6_send_skb(skb, &fl6);
1101
1102out:
1103 up->len = 0;
1104 up->pending = 0;
1105 return err;
1106}
1107
1108int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1109{
1110 struct ipv6_txoptions opt_space;
1111 struct udp_sock *up = udp_sk(sk);
1112 struct inet_sock *inet = inet_sk(sk);
1113 struct ipv6_pinfo *np = inet6_sk(sk);
1114 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1115 struct in6_addr *daddr, *final_p, final;
1116 struct ipv6_txoptions *opt = NULL;
1117 struct ipv6_txoptions *opt_to_free = NULL;
1118 struct ip6_flowlabel *flowlabel = NULL;
1119 struct flowi6 fl6;
1120 struct dst_entry *dst;
1121 int addr_len = msg->msg_namelen;
1122 int ulen = len;
1123 int hlimit = -1;
1124 int tclass = -1;
1125 int dontfrag = -1;
1126 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1127 int err;
1128 int connected = 0;
1129 int is_udplite = IS_UDPLITE(sk);
1130 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1131
1132 /* destination address check */
1133 if (sin6) {
1134 if (addr_len < offsetof(struct sockaddr, sa_data))
1135 return -EINVAL;
1136
1137 switch (sin6->sin6_family) {
1138 case AF_INET6:
1139 if (addr_len < SIN6_LEN_RFC2133)
1140 return -EINVAL;
1141 daddr = &sin6->sin6_addr;
1142 break;
1143 case AF_INET:
1144 goto do_udp_sendmsg;
1145 case AF_UNSPEC:
1146 msg->msg_name = sin6 = NULL;
1147 msg->msg_namelen = addr_len = 0;
1148 daddr = NULL;
1149 break;
1150 default:
1151 return -EINVAL;
1152 }
1153 } else if (!up->pending) {
1154 if (sk->sk_state != TCP_ESTABLISHED)
1155 return -EDESTADDRREQ;
1156 daddr = &sk->sk_v6_daddr;
1157 } else
1158 daddr = NULL;
1159
1160 if (daddr) {
1161 if (ipv6_addr_v4mapped(daddr)) {
1162 struct sockaddr_in sin;
1163 sin.sin_family = AF_INET;
1164 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1165 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1166 msg->msg_name = &sin;
1167 msg->msg_namelen = sizeof(sin);
1168do_udp_sendmsg:
1169 if (__ipv6_only_sock(sk))
1170 return -ENETUNREACH;
1171 return udp_sendmsg(sk, msg, len);
1172 }
1173 }
1174
1175 if (up->pending == AF_INET)
1176 return udp_sendmsg(sk, msg, len);
1177
1178 /* Rough check on arithmetic overflow,
1179 better check is made in ip6_append_data().
1180 */
1181 if (len > INT_MAX - sizeof(struct udphdr))
1182 return -EMSGSIZE;
1183
1184 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1185 if (up->pending) {
1186 /*
1187 * There are pending frames.
1188 * The socket lock must be held while it's corked.
1189 */
1190 lock_sock(sk);
1191 if (likely(up->pending)) {
1192 if (unlikely(up->pending != AF_INET6)) {
1193 release_sock(sk);
1194 return -EAFNOSUPPORT;
1195 }
1196 dst = NULL;
1197 goto do_append_data;
1198 }
1199 release_sock(sk);
1200 }
1201 ulen += sizeof(struct udphdr);
1202
1203 memset(&fl6, 0, sizeof(fl6));
1204
1205 if (sin6) {
1206 if (sin6->sin6_port == 0)
1207 return -EINVAL;
1208
1209 fl6.fl6_dport = sin6->sin6_port;
1210 daddr = &sin6->sin6_addr;
1211
1212 if (np->sndflow) {
1213 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1214 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1215 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1216 if (!flowlabel)
1217 return -EINVAL;
1218 }
1219 }
1220
1221 /*
1222 * Otherwise it will be difficult to maintain
1223 * sk->sk_dst_cache.
1224 */
1225 if (sk->sk_state == TCP_ESTABLISHED &&
1226 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1227 daddr = &sk->sk_v6_daddr;
1228
1229 if (addr_len >= sizeof(struct sockaddr_in6) &&
1230 sin6->sin6_scope_id &&
1231 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1232 fl6.flowi6_oif = sin6->sin6_scope_id;
1233 } else {
1234 if (sk->sk_state != TCP_ESTABLISHED)
1235 return -EDESTADDRREQ;
1236
1237 fl6.fl6_dport = inet->inet_dport;
1238 daddr = &sk->sk_v6_daddr;
1239 fl6.flowlabel = np->flow_label;
1240 connected = 1;
1241 }
1242
1243 if (!fl6.flowi6_oif)
1244 fl6.flowi6_oif = sk->sk_bound_dev_if;
1245
1246 if (!fl6.flowi6_oif)
1247 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1248
1249 fl6.flowi6_mark = sk->sk_mark;
1250
1251 if (msg->msg_controllen) {
1252 opt = &opt_space;
1253 memset(opt, 0, sizeof(struct ipv6_txoptions));
1254 opt->tot_len = sizeof(*opt);
1255
1256 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1257 &hlimit, &tclass, &dontfrag);
1258 if (err < 0) {
1259 fl6_sock_release(flowlabel);
1260 return err;
1261 }
1262 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1263 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1264 if (!flowlabel)
1265 return -EINVAL;
1266 }
1267 if (!(opt->opt_nflen|opt->opt_flen))
1268 opt = NULL;
1269 connected = 0;
1270 }
1271 if (!opt) {
1272 opt = txopt_get(np);
1273 opt_to_free = opt;
1274 }
1275 if (flowlabel)
1276 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1277 opt = ipv6_fixup_options(&opt_space, opt);
1278
1279 fl6.flowi6_proto = sk->sk_protocol;
1280 if (!ipv6_addr_any(daddr))
1281 fl6.daddr = *daddr;
1282 else
1283 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1284 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1285 fl6.saddr = np->saddr;
1286 fl6.fl6_sport = inet->inet_sport;
1287
1288 final_p = fl6_update_dst(&fl6, opt, &final);
1289 if (final_p)
1290 connected = 0;
1291
1292 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1293 fl6.flowi6_oif = np->mcast_oif;
1294 connected = 0;
1295 } else if (!fl6.flowi6_oif)
1296 fl6.flowi6_oif = np->ucast_oif;
1297
1298 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1299
1300 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1301 if (IS_ERR(dst)) {
1302 err = PTR_ERR(dst);
1303 dst = NULL;
1304 goto out;
1305 }
1306
1307 if (hlimit < 0)
1308 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1309
1310 if (tclass < 0)
1311 tclass = np->tclass;
1312
1313 if (msg->msg_flags&MSG_CONFIRM)
1314 goto do_confirm;
1315back_from_confirm:
1316
1317 /* Lockless fast path for the non-corking case */
1318 if (!corkreq) {
1319 struct sk_buff *skb;
1320
1321 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1322 sizeof(struct udphdr), hlimit, tclass, opt,
1323 &fl6, (struct rt6_info *)dst,
1324 msg->msg_flags, dontfrag);
1325 err = PTR_ERR(skb);
1326 if (!IS_ERR_OR_NULL(skb))
1327 err = udp_v6_send_skb(skb, &fl6);
1328 goto release_dst;
1329 }
1330
1331 lock_sock(sk);
1332 if (unlikely(up->pending)) {
1333 /* The socket is already corked while preparing it. */
1334 /* ... which is an evident application bug. --ANK */
1335 release_sock(sk);
1336
1337 net_dbg_ratelimited("udp cork app bug 2\n");
1338 err = -EINVAL;
1339 goto out;
1340 }
1341
1342 up->pending = AF_INET6;
1343
1344do_append_data:
1345 if (dontfrag < 0)
1346 dontfrag = np->dontfrag;
1347 up->len += ulen;
1348 err = ip6_append_data(sk, getfrag, msg, ulen,
1349 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1350 (struct rt6_info *)dst,
1351 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1352 if (err)
1353 udp_v6_flush_pending_frames(sk);
1354 else if (!corkreq)
1355 err = udp_v6_push_pending_frames(sk);
1356 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1357 up->pending = 0;
1358
1359 if (err > 0)
1360 err = np->recverr ? net_xmit_errno(err) : 0;
1361 release_sock(sk);
1362
1363release_dst:
1364 if (dst) {
1365 if (connected) {
1366 ip6_dst_store(sk, dst,
1367 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1368 &sk->sk_v6_daddr : NULL,
1369#ifdef CONFIG_IPV6_SUBTREES
1370 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1371 &np->saddr :
1372#endif
1373 NULL);
1374 } else {
1375 dst_release(dst);
1376 }
1377 dst = NULL;
1378 }
1379
1380out:
1381 dst_release(dst);
1382 fl6_sock_release(flowlabel);
1383 txopt_put(opt_to_free);
1384 if (!err)
1385 return len;
1386 /*
1387 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1388 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1389 * we don't have a good statistic (IpOutDiscards but it can be too many
1390 * things). We could add another new stat but at least for now that
1391 * seems like overkill.
1392 */
1393 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1394 UDP6_INC_STATS_USER(sock_net(sk),
1395 UDP_MIB_SNDBUFERRORS, is_udplite);
1396 }
1397 return err;
1398
1399do_confirm:
1400 dst_confirm(dst);
1401 if (!(msg->msg_flags&MSG_PROBE) || len)
1402 goto back_from_confirm;
1403 err = 0;
1404 goto out;
1405}
1406
1407void udpv6_destroy_sock(struct sock *sk)
1408{
1409 struct udp_sock *up = udp_sk(sk);
1410 lock_sock(sk);
1411 udp_v6_flush_pending_frames(sk);
1412 release_sock(sk);
1413
1414 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1415 void (*encap_destroy)(struct sock *sk);
1416 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1417 if (encap_destroy)
1418 encap_destroy(sk);
1419 }
1420
1421 inet6_destroy_sock(sk);
1422}
1423
1424/*
1425 * Socket option code for UDP
1426 */
1427int udpv6_setsockopt(struct sock *sk, int level, int optname,
1428 char __user *optval, unsigned int optlen)
1429{
1430 if (level == SOL_UDP || level == SOL_UDPLITE)
1431 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1432 udp_v6_push_pending_frames);
1433 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1434}
1435
1436#ifdef CONFIG_COMPAT
1437int compat_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 compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1444}
1445#endif
1446
1447int udpv6_getsockopt(struct sock *sk, int level, int optname,
1448 char __user *optval, int __user *optlen)
1449{
1450 if (level == SOL_UDP || level == SOL_UDPLITE)
1451 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1452 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1453}
1454
1455#ifdef CONFIG_COMPAT
1456int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1457 char __user *optval, int __user *optlen)
1458{
1459 if (level == SOL_UDP || level == SOL_UDPLITE)
1460 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1461 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1462}
1463#endif
1464
1465static const struct inet6_protocol udpv6_protocol = {
1466 .handler = udpv6_rcv,
1467 .err_handler = udpv6_err,
1468 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1469};
1470
1471/* ------------------------------------------------------------------------ */
1472#ifdef CONFIG_PROC_FS
1473int udp6_seq_show(struct seq_file *seq, void *v)
1474{
1475 if (v == SEQ_START_TOKEN) {
1476 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1477 } else {
1478 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1479 struct inet_sock *inet = inet_sk(v);
1480 __u16 srcp = ntohs(inet->inet_sport);
1481 __u16 destp = ntohs(inet->inet_dport);
1482 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1483 }
1484 return 0;
1485}
1486
1487static const struct file_operations udp6_afinfo_seq_fops = {
1488 .owner = THIS_MODULE,
1489 .open = udp_seq_open,
1490 .read = seq_read,
1491 .llseek = seq_lseek,
1492 .release = seq_release_net
1493};
1494
1495static struct udp_seq_afinfo udp6_seq_afinfo = {
1496 .name = "udp6",
1497 .family = AF_INET6,
1498 .udp_table = &udp_table,
1499 .seq_fops = &udp6_afinfo_seq_fops,
1500 .seq_ops = {
1501 .show = udp6_seq_show,
1502 },
1503};
1504
1505int __net_init udp6_proc_init(struct net *net)
1506{
1507 return udp_proc_register(net, &udp6_seq_afinfo);
1508}
1509
1510void udp6_proc_exit(struct net *net)
1511{
1512 udp_proc_unregister(net, &udp6_seq_afinfo);
1513}
1514#endif /* CONFIG_PROC_FS */
1515
1516void udp_v6_clear_sk(struct sock *sk, int size)
1517{
1518 struct inet_sock *inet = inet_sk(sk);
1519
1520 /* we do not want to clear pinet6 field, because of RCU lookups */
1521 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1522
1523 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1524 memset(&inet->pinet6 + 1, 0, size);
1525}
1526
1527/* ------------------------------------------------------------------------ */
1528
1529struct proto udpv6_prot = {
1530 .name = "UDPv6",
1531 .owner = THIS_MODULE,
1532 .close = udp_lib_close,
1533 .connect = ip6_datagram_connect,
1534 .disconnect = udp_disconnect,
1535 .ioctl = udp_ioctl,
1536 .destroy = udpv6_destroy_sock,
1537 .setsockopt = udpv6_setsockopt,
1538 .getsockopt = udpv6_getsockopt,
1539 .sendmsg = udpv6_sendmsg,
1540 .recvmsg = udpv6_recvmsg,
1541 .backlog_rcv = __udpv6_queue_rcv_skb,
1542 .release_cb = ip6_datagram_release_cb,
1543 .hash = udp_lib_hash,
1544 .unhash = udp_lib_unhash,
1545 .rehash = udp_v6_rehash,
1546 .get_port = udp_v6_get_port,
1547 .memory_allocated = &udp_memory_allocated,
1548 .sysctl_mem = sysctl_udp_mem,
1549 .sysctl_wmem = &sysctl_udp_wmem_min,
1550 .sysctl_rmem = &sysctl_udp_rmem_min,
1551 .obj_size = sizeof(struct udp6_sock),
1552 .slab_flags = SLAB_DESTROY_BY_RCU,
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 .clear_sk = udp_v6_clear_sk,
1559};
1560
1561static 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
1569int __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;
1580out:
1581 return ret;
1582
1583out_udpv6_protocol:
1584 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1585 goto out;
1586}
1587
1588void udpv6_exit(void)
1589{
1590 inet6_unregister_protosw(&udpv6_protosw);
1591 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1592}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * UDP over IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/udp.c
10 *
11 * Fixes:
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
14 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
15 * a single port at the same time.
16 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
17 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
18 */
19
20#include <linux/bpf-cgroup.h>
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/socket.h>
24#include <linux/sockios.h>
25#include <linux/net.h>
26#include <linux/in6.h>
27#include <linux/netdevice.h>
28#include <linux/if_arp.h>
29#include <linux/ipv6.h>
30#include <linux/icmpv6.h>
31#include <linux/init.h>
32#include <linux/module.h>
33#include <linux/skbuff.h>
34#include <linux/slab.h>
35#include <linux/uaccess.h>
36#include <linux/indirect_call_wrapper.h>
37
38#include <net/addrconf.h>
39#include <net/ndisc.h>
40#include <net/protocol.h>
41#include <net/transp_v6.h>
42#include <net/ip6_route.h>
43#include <net/raw.h>
44#include <net/seg6.h>
45#include <net/tcp_states.h>
46#include <net/ip6_checksum.h>
47#include <net/ip6_tunnel.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
59static void udpv6_destruct_sock(struct sock *sk)
60{
61 udp_destruct_common(sk);
62 inet6_sock_destruct(sk);
63}
64
65int udpv6_init_sock(struct sock *sk)
66{
67 udp_lib_init_sock(sk);
68 sk->sk_destruct = udpv6_destruct_sock;
69 set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
70 return 0;
71}
72
73static u32 udp6_ehashfn(const struct net *net,
74 const struct in6_addr *laddr,
75 const u16 lport,
76 const struct in6_addr *faddr,
77 const __be16 fport)
78{
79 static u32 udp6_ehash_secret __read_mostly;
80 static u32 udp_ipv6_hash_secret __read_mostly;
81
82 u32 lhash, fhash;
83
84 net_get_random_once(&udp6_ehash_secret,
85 sizeof(udp6_ehash_secret));
86 net_get_random_once(&udp_ipv6_hash_secret,
87 sizeof(udp_ipv6_hash_secret));
88
89 lhash = (__force u32)laddr->s6_addr32[3];
90 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
91
92 return __inet6_ehashfn(lhash, lport, fhash, fport,
93 udp_ipv6_hash_secret + net_hash_mix(net));
94}
95
96int udp_v6_get_port(struct sock *sk, unsigned short snum)
97{
98 unsigned int hash2_nulladdr =
99 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
100 unsigned int hash2_partial =
101 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
102
103 /* precompute partial secondary hash */
104 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
105 return udp_lib_get_port(sk, snum, hash2_nulladdr);
106}
107
108void udp_v6_rehash(struct sock *sk)
109{
110 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
111 &sk->sk_v6_rcv_saddr,
112 inet_sk(sk)->inet_num);
113
114 udp_lib_rehash(sk, new_hash);
115}
116
117static int compute_score(struct sock *sk, struct net *net,
118 const struct in6_addr *saddr, __be16 sport,
119 const struct in6_addr *daddr, unsigned short hnum,
120 int dif, int sdif)
121{
122 int bound_dev_if, score;
123 struct inet_sock *inet;
124 bool dev_match;
125
126 if (!net_eq(sock_net(sk), net) ||
127 udp_sk(sk)->udp_port_hash != hnum ||
128 sk->sk_family != PF_INET6)
129 return -1;
130
131 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
132 return -1;
133
134 score = 0;
135 inet = inet_sk(sk);
136
137 if (inet->inet_dport) {
138 if (inet->inet_dport != sport)
139 return -1;
140 score++;
141 }
142
143 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
144 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
145 return -1;
146 score++;
147 }
148
149 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
150 dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif);
151 if (!dev_match)
152 return -1;
153 if (bound_dev_if)
154 score++;
155
156 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
157 score++;
158
159 return score;
160}
161
162static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
163 struct sk_buff *skb,
164 const struct in6_addr *saddr,
165 __be16 sport,
166 const struct in6_addr *daddr,
167 unsigned int hnum)
168{
169 struct sock *reuse_sk = NULL;
170 u32 hash;
171
172 if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
173 hash = udp6_ehashfn(net, daddr, hnum, saddr, sport);
174 reuse_sk = reuseport_select_sock(sk, hash, skb,
175 sizeof(struct udphdr));
176 }
177 return reuse_sk;
178}
179
180/* called with rcu_read_lock() */
181static struct sock *udp6_lib_lookup2(struct net *net,
182 const struct in6_addr *saddr, __be16 sport,
183 const struct in6_addr *daddr, unsigned int hnum,
184 int dif, int sdif, struct udp_hslot *hslot2,
185 struct sk_buff *skb)
186{
187 struct sock *sk, *result;
188 int score, badness;
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);
195 if (score > badness) {
196 result = lookup_reuseport(net, sk, skb,
197 saddr, sport, daddr, hnum);
198 /* Fall back to scoring if group has connections */
199 if (result && !reuseport_has_conns(sk))
200 return result;
201
202 result = result ? : sk;
203 badness = score;
204 }
205 }
206 return result;
207}
208
209static inline struct sock *udp6_lookup_run_bpf(struct net *net,
210 struct udp_table *udptable,
211 struct sk_buff *skb,
212 const struct in6_addr *saddr,
213 __be16 sport,
214 const struct in6_addr *daddr,
215 u16 hnum, const int dif)
216{
217 struct sock *sk, *reuse_sk;
218 bool no_reuseport;
219
220 if (udptable != net->ipv4.udp_table)
221 return NULL; /* only UDP is supported */
222
223 no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport,
224 daddr, hnum, dif, &sk);
225 if (no_reuseport || IS_ERR_OR_NULL(sk))
226 return sk;
227
228 reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
229 if (reuse_sk)
230 sk = reuse_sk;
231 return sk;
232}
233
234/* rcu_read_lock() must be held */
235struct sock *__udp6_lib_lookup(struct net *net,
236 const struct in6_addr *saddr, __be16 sport,
237 const struct in6_addr *daddr, __be16 dport,
238 int dif, int sdif, struct udp_table *udptable,
239 struct sk_buff *skb)
240{
241 unsigned short hnum = ntohs(dport);
242 unsigned int hash2, slot2;
243 struct udp_hslot *hslot2;
244 struct sock *result, *sk;
245
246 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
247 slot2 = hash2 & udptable->mask;
248 hslot2 = &udptable->hash2[slot2];
249
250 /* Lookup connected or non-wildcard sockets */
251 result = udp6_lib_lookup2(net, saddr, sport,
252 daddr, hnum, dif, sdif,
253 hslot2, skb);
254 if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED)
255 goto done;
256
257 /* Lookup redirect from BPF */
258 if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
259 sk = udp6_lookup_run_bpf(net, udptable, skb,
260 saddr, sport, daddr, hnum, dif);
261 if (sk) {
262 result = sk;
263 goto done;
264 }
265 }
266
267 /* Got non-wildcard socket or error on first lookup */
268 if (result)
269 goto done;
270
271 /* Lookup wildcard sockets */
272 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
273 slot2 = hash2 & udptable->mask;
274 hslot2 = &udptable->hash2[slot2];
275
276 result = udp6_lib_lookup2(net, saddr, sport,
277 &in6addr_any, hnum, dif, sdif,
278 hslot2, skb);
279done:
280 if (IS_ERR(result))
281 return NULL;
282 return result;
283}
284EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
285
286static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
287 __be16 sport, __be16 dport,
288 struct udp_table *udptable)
289{
290 const struct ipv6hdr *iph = ipv6_hdr(skb);
291
292 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
293 &iph->daddr, dport, inet6_iif(skb),
294 inet6_sdif(skb), udptable, skb);
295}
296
297struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
298 __be16 sport, __be16 dport)
299{
300 const struct ipv6hdr *iph = ipv6_hdr(skb);
301 struct net *net = dev_net(skb->dev);
302
303 return __udp6_lib_lookup(net, &iph->saddr, sport,
304 &iph->daddr, dport, inet6_iif(skb),
305 inet6_sdif(skb), net->ipv4.udp_table, NULL);
306}
307
308/* Must be called under rcu_read_lock().
309 * Does increment socket refcount.
310 */
311#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
312struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
313 const struct in6_addr *daddr, __be16 dport, int dif)
314{
315 struct sock *sk;
316
317 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
318 dif, 0, net->ipv4.udp_table, NULL);
319 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
320 sk = NULL;
321 return sk;
322}
323EXPORT_SYMBOL_GPL(udp6_lib_lookup);
324#endif
325
326/* do not use the scratch area len for jumbogram: their length execeeds the
327 * scratch area space; note that the IP6CB flags is still in the first
328 * cacheline, so checking for jumbograms is cheap
329 */
330static int udp6_skb_len(struct sk_buff *skb)
331{
332 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
333}
334
335/*
336 * This should be easy, if there is something there we
337 * return it, otherwise we block.
338 */
339
340int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
341 int flags, int *addr_len)
342{
343 struct ipv6_pinfo *np = inet6_sk(sk);
344 struct inet_sock *inet = inet_sk(sk);
345 struct sk_buff *skb;
346 unsigned int ulen, copied;
347 int off, err, peeking = flags & MSG_PEEK;
348 int is_udplite = IS_UDPLITE(sk);
349 struct udp_mib __percpu *mib;
350 bool checksum_valid = false;
351 int is_udp4;
352
353 if (flags & MSG_ERRQUEUE)
354 return ipv6_recv_error(sk, msg, len, addr_len);
355
356 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
357 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
358
359try_again:
360 off = sk_peek_offset(sk, flags);
361 skb = __skb_recv_udp(sk, flags, &off, &err);
362 if (!skb)
363 return err;
364
365 ulen = udp6_skb_len(skb);
366 copied = len;
367 if (copied > ulen - off)
368 copied = ulen - off;
369 else if (copied < ulen)
370 msg->msg_flags |= MSG_TRUNC;
371
372 is_udp4 = (skb->protocol == htons(ETH_P_IP));
373 mib = __UDPX_MIB(sk, is_udp4);
374
375 /*
376 * If checksum is needed at all, try to do it while copying the
377 * data. If the data is truncated, or if we only want a partial
378 * coverage checksum (UDP-Lite), do it before the copy.
379 */
380
381 if (copied < ulen || peeking ||
382 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
383 checksum_valid = udp_skb_csum_unnecessary(skb) ||
384 !__udp_lib_checksum_complete(skb);
385 if (!checksum_valid)
386 goto csum_copy_err;
387 }
388
389 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
390 if (udp_skb_is_linear(skb))
391 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
392 else
393 err = skb_copy_datagram_msg(skb, off, msg, copied);
394 } else {
395 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
396 if (err == -EINVAL)
397 goto csum_copy_err;
398 }
399 if (unlikely(err)) {
400 if (!peeking) {
401 atomic_inc(&sk->sk_drops);
402 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
403 }
404 kfree_skb(skb);
405 return err;
406 }
407 if (!peeking)
408 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS);
409
410 sock_recv_cmsgs(msg, sk, skb);
411
412 /* Copy the address. */
413 if (msg->msg_name) {
414 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
415 sin6->sin6_family = AF_INET6;
416 sin6->sin6_port = udp_hdr(skb)->source;
417 sin6->sin6_flowinfo = 0;
418
419 if (is_udp4) {
420 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
421 &sin6->sin6_addr);
422 sin6->sin6_scope_id = 0;
423 } else {
424 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
425 sin6->sin6_scope_id =
426 ipv6_iface_scope_id(&sin6->sin6_addr,
427 inet6_iif(skb));
428 }
429 *addr_len = sizeof(*sin6);
430
431 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
432 (struct sockaddr *)sin6);
433 }
434
435 if (udp_sk(sk)->gro_enabled)
436 udp_cmsg_recv(msg, sk, skb);
437
438 if (np->rxopt.all)
439 ip6_datagram_recv_common_ctl(sk, msg, skb);
440
441 if (is_udp4) {
442 if (inet->cmsg_flags)
443 ip_cmsg_recv_offset(msg, sk, skb,
444 sizeof(struct udphdr), off);
445 } else {
446 if (np->rxopt.all)
447 ip6_datagram_recv_specific_ctl(sk, msg, skb);
448 }
449
450 err = copied;
451 if (flags & MSG_TRUNC)
452 err = ulen;
453
454 skb_consume_udp(sk, skb, peeking ? -err : err);
455 return err;
456
457csum_copy_err:
458 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
459 udp_skb_destructor)) {
460 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS);
461 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
462 }
463 kfree_skb(skb);
464
465 /* starting over for a new packet, but check if we need to yield */
466 cond_resched();
467 msg->msg_flags &= ~MSG_TRUNC;
468 goto try_again;
469}
470
471DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
472void udpv6_encap_enable(void)
473{
474 static_branch_inc(&udpv6_encap_needed_key);
475}
476EXPORT_SYMBOL(udpv6_encap_enable);
477
478/* Handler for tunnels with arbitrary destination ports: no socket lookup, go
479 * through error handlers in encapsulations looking for a match.
480 */
481static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb,
482 struct inet6_skb_parm *opt,
483 u8 type, u8 code, int offset, __be32 info)
484{
485 int i;
486
487 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
488 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
489 u8 type, u8 code, int offset, __be32 info);
490 const struct ip6_tnl_encap_ops *encap;
491
492 encap = rcu_dereference(ip6tun_encaps[i]);
493 if (!encap)
494 continue;
495 handler = encap->err_handler;
496 if (handler && !handler(skb, opt, type, code, offset, info))
497 return 0;
498 }
499
500 return -ENOENT;
501}
502
503/* Try to match ICMP errors to UDP tunnels by looking up a socket without
504 * reversing source and destination port: this will match tunnels that force the
505 * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that
506 * lwtunnels might actually break this assumption by being configured with
507 * different destination ports on endpoints, in this case we won't be able to
508 * trace ICMP messages back to them.
509 *
510 * If this doesn't match any socket, probe tunnels with arbitrary destination
511 * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port
512 * we've sent packets to won't necessarily match the local destination port.
513 *
514 * Then ask the tunnel implementation to match the error against a valid
515 * association.
516 *
517 * Return an error if we can't find a match, the socket if we need further
518 * processing, zero otherwise.
519 */
520static struct sock *__udp6_lib_err_encap(struct net *net,
521 const struct ipv6hdr *hdr, int offset,
522 struct udphdr *uh,
523 struct udp_table *udptable,
524 struct sock *sk,
525 struct sk_buff *skb,
526 struct inet6_skb_parm *opt,
527 u8 type, u8 code, __be32 info)
528{
529 int (*lookup)(struct sock *sk, struct sk_buff *skb);
530 int network_offset, transport_offset;
531 struct udp_sock *up;
532
533 network_offset = skb_network_offset(skb);
534 transport_offset = skb_transport_offset(skb);
535
536 /* Network header needs to point to the outer IPv6 header inside ICMP */
537 skb_reset_network_header(skb);
538
539 /* Transport header needs to point to the UDP header */
540 skb_set_transport_header(skb, offset);
541
542 if (sk) {
543 up = udp_sk(sk);
544
545 lookup = READ_ONCE(up->encap_err_lookup);
546 if (lookup && lookup(sk, skb))
547 sk = NULL;
548
549 goto out;
550 }
551
552 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
553 &hdr->saddr, uh->dest,
554 inet6_iif(skb), 0, udptable, skb);
555 if (sk) {
556 up = udp_sk(sk);
557
558 lookup = READ_ONCE(up->encap_err_lookup);
559 if (!lookup || lookup(sk, skb))
560 sk = NULL;
561 }
562
563out:
564 if (!sk) {
565 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code,
566 offset, info));
567 }
568
569 skb_set_transport_header(skb, transport_offset);
570 skb_set_network_header(skb, network_offset);
571
572 return sk;
573}
574
575int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
576 u8 type, u8 code, int offset, __be32 info,
577 struct udp_table *udptable)
578{
579 struct ipv6_pinfo *np;
580 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
581 const struct in6_addr *saddr = &hdr->saddr;
582 const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr;
583 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
584 bool tunnel = false;
585 struct sock *sk;
586 int harderr;
587 int err;
588 struct net *net = dev_net(skb->dev);
589
590 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
591 inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
592
593 if (!sk || udp_sk(sk)->encap_type) {
594 /* No socket for error: try tunnels before discarding */
595 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
596 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
597 udptable, sk, skb,
598 opt, type, code, info);
599 if (!sk)
600 return 0;
601 } else
602 sk = ERR_PTR(-ENOENT);
603
604 if (IS_ERR(sk)) {
605 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
606 ICMP6_MIB_INERRORS);
607 return PTR_ERR(sk);
608 }
609
610 tunnel = true;
611 }
612
613 harderr = icmpv6_err_convert(type, code, &err);
614 np = inet6_sk(sk);
615
616 if (type == ICMPV6_PKT_TOOBIG) {
617 if (!ip6_sk_accept_pmtu(sk))
618 goto out;
619 ip6_sk_update_pmtu(skb, sk, info);
620 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
621 harderr = 1;
622 }
623 if (type == NDISC_REDIRECT) {
624 if (tunnel) {
625 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
626 sk->sk_mark, sk->sk_uid);
627 } else {
628 ip6_sk_redirect(skb, sk);
629 }
630 goto out;
631 }
632
633 /* Tunnels don't have an application socket: don't pass errors back */
634 if (tunnel) {
635 if (udp_sk(sk)->encap_err_rcv)
636 udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest,
637 ntohl(info), (u8 *)(uh+1));
638 goto out;
639 }
640
641 if (!np->recverr) {
642 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
643 goto out;
644 } else {
645 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
646 }
647
648 sk->sk_err = err;
649 sk_error_report(sk);
650out:
651 return 0;
652}
653
654static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
655{
656 int rc;
657
658 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
659 sock_rps_save_rxhash(sk, skb);
660 sk_mark_napi_id(sk, skb);
661 sk_incoming_cpu_update(sk);
662 } else {
663 sk_mark_napi_id_once(sk, skb);
664 }
665
666 rc = __udp_enqueue_schedule_skb(sk, skb);
667 if (rc < 0) {
668 int is_udplite = IS_UDPLITE(sk);
669 enum skb_drop_reason drop_reason;
670
671 /* Note that an ENOMEM error is charged twice */
672 if (rc == -ENOMEM) {
673 UDP6_INC_STATS(sock_net(sk),
674 UDP_MIB_RCVBUFERRORS, is_udplite);
675 drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
676 } else {
677 UDP6_INC_STATS(sock_net(sk),
678 UDP_MIB_MEMERRORS, is_udplite);
679 drop_reason = SKB_DROP_REASON_PROTO_MEM;
680 }
681 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
682 kfree_skb_reason(skb, drop_reason);
683 return -1;
684 }
685
686 return 0;
687}
688
689static __inline__ int udpv6_err(struct sk_buff *skb,
690 struct inet6_skb_parm *opt, u8 type,
691 u8 code, int offset, __be32 info)
692{
693 return __udp6_lib_err(skb, opt, type, code, offset, info,
694 dev_net(skb->dev)->ipv4.udp_table);
695}
696
697static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
698{
699 enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
700 struct udp_sock *up = udp_sk(sk);
701 int is_udplite = IS_UDPLITE(sk);
702
703 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
704 drop_reason = SKB_DROP_REASON_XFRM_POLICY;
705 goto drop;
706 }
707
708 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
709 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
710
711 /*
712 * This is an encapsulation socket so pass the skb to
713 * the socket's udp_encap_rcv() hook. Otherwise, just
714 * fall through and pass this up the UDP socket.
715 * up->encap_rcv() returns the following value:
716 * =0 if skb was successfully passed to the encap
717 * handler or was discarded by it.
718 * >0 if skb should be passed on to UDP.
719 * <0 if skb should be resubmitted as proto -N
720 */
721
722 /* if we're overly short, let UDP handle it */
723 encap_rcv = READ_ONCE(up->encap_rcv);
724 if (encap_rcv) {
725 int ret;
726
727 /* Verify checksum before giving to encap */
728 if (udp_lib_checksum_complete(skb))
729 goto csum_error;
730
731 ret = encap_rcv(sk, skb);
732 if (ret <= 0) {
733 __UDP6_INC_STATS(sock_net(sk),
734 UDP_MIB_INDATAGRAMS,
735 is_udplite);
736 return -ret;
737 }
738 }
739
740 /* FALLTHROUGH -- it's a UDP Packet */
741 }
742
743 /*
744 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
745 */
746 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
747
748 if (up->pcrlen == 0) { /* full coverage was set */
749 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
750 UDP_SKB_CB(skb)->cscov, skb->len);
751 goto drop;
752 }
753 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
754 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
755 UDP_SKB_CB(skb)->cscov, up->pcrlen);
756 goto drop;
757 }
758 }
759
760 prefetch(&sk->sk_rmem_alloc);
761 if (rcu_access_pointer(sk->sk_filter) &&
762 udp_lib_checksum_complete(skb))
763 goto csum_error;
764
765 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) {
766 drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
767 goto drop;
768 }
769
770 udp_csum_pull_header(skb);
771
772 skb_dst_drop(skb);
773
774 return __udpv6_queue_rcv_skb(sk, skb);
775
776csum_error:
777 drop_reason = SKB_DROP_REASON_UDP_CSUM;
778 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
779drop:
780 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
781 atomic_inc(&sk->sk_drops);
782 kfree_skb_reason(skb, drop_reason);
783 return -1;
784}
785
786static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
787{
788 struct sk_buff *next, *segs;
789 int ret;
790
791 if (likely(!udp_unexpected_gso(sk, skb)))
792 return udpv6_queue_rcv_one_skb(sk, skb);
793
794 __skb_push(skb, -skb_mac_offset(skb));
795 segs = udp_rcv_segment(sk, skb, false);
796 skb_list_walk_safe(segs, skb, next) {
797 __skb_pull(skb, skb_transport_offset(skb));
798
799 udp_post_segment_fix_csum(skb);
800 ret = udpv6_queue_rcv_one_skb(sk, skb);
801 if (ret > 0)
802 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
803 true);
804 }
805 return 0;
806}
807
808static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
809 __be16 loc_port, const struct in6_addr *loc_addr,
810 __be16 rmt_port, const struct in6_addr *rmt_addr,
811 int dif, int sdif, unsigned short hnum)
812{
813 struct inet_sock *inet = inet_sk(sk);
814
815 if (!net_eq(sock_net(sk), net))
816 return false;
817
818 if (udp_sk(sk)->udp_port_hash != hnum ||
819 sk->sk_family != PF_INET6 ||
820 (inet->inet_dport && inet->inet_dport != rmt_port) ||
821 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
822 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
823 !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) ||
824 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
825 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
826 return false;
827 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
828 return false;
829 return true;
830}
831
832static void udp6_csum_zero_error(struct sk_buff *skb)
833{
834 /* RFC 2460 section 8.1 says that we SHOULD log
835 * this error. Well, it is reasonable.
836 */
837 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
838 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
839 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
840}
841
842/*
843 * Note: called only from the BH handler context,
844 * so we don't need to lock the hashes.
845 */
846static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
847 const struct in6_addr *saddr, const struct in6_addr *daddr,
848 struct udp_table *udptable, int proto)
849{
850 struct sock *sk, *first = NULL;
851 const struct udphdr *uh = udp_hdr(skb);
852 unsigned short hnum = ntohs(uh->dest);
853 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
854 unsigned int offset = offsetof(typeof(*sk), sk_node);
855 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
856 int dif = inet6_iif(skb);
857 int sdif = inet6_sdif(skb);
858 struct hlist_node *node;
859 struct sk_buff *nskb;
860
861 if (use_hash2) {
862 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
863 udptable->mask;
864 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
865start_lookup:
866 hslot = &udptable->hash2[hash2];
867 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
868 }
869
870 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
871 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
872 uh->source, saddr, dif, sdif,
873 hnum))
874 continue;
875 /* If zero checksum and no_check is not on for
876 * the socket then skip it.
877 */
878 if (!uh->check && !udp_sk(sk)->no_check6_rx)
879 continue;
880 if (!first) {
881 first = sk;
882 continue;
883 }
884 nskb = skb_clone(skb, GFP_ATOMIC);
885 if (unlikely(!nskb)) {
886 atomic_inc(&sk->sk_drops);
887 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
888 IS_UDPLITE(sk));
889 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
890 IS_UDPLITE(sk));
891 continue;
892 }
893
894 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
895 consume_skb(nskb);
896 }
897
898 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
899 if (use_hash2 && hash2 != hash2_any) {
900 hash2 = hash2_any;
901 goto start_lookup;
902 }
903
904 if (first) {
905 if (udpv6_queue_rcv_skb(first, skb) > 0)
906 consume_skb(skb);
907 } else {
908 kfree_skb(skb);
909 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
910 proto == IPPROTO_UDPLITE);
911 }
912 return 0;
913}
914
915static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
916{
917 if (udp_sk_rx_dst_set(sk, dst)) {
918 const struct rt6_info *rt = (const struct rt6_info *)dst;
919
920 sk->sk_rx_dst_cookie = rt6_get_cookie(rt);
921 }
922}
923
924/* wrapper for udp_queue_rcv_skb tacking care of csum conversion and
925 * return code conversion for ip layer consumption
926 */
927static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
928 struct udphdr *uh)
929{
930 int ret;
931
932 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
933 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo);
934
935 ret = udpv6_queue_rcv_skb(sk, skb);
936
937 /* a return value > 0 means to resubmit the input */
938 if (ret > 0)
939 return ret;
940 return 0;
941}
942
943int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
944 int proto)
945{
946 enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
947 const struct in6_addr *saddr, *daddr;
948 struct net *net = dev_net(skb->dev);
949 struct udphdr *uh;
950 struct sock *sk;
951 bool refcounted;
952 u32 ulen = 0;
953
954 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
955 goto discard;
956
957 saddr = &ipv6_hdr(skb)->saddr;
958 daddr = &ipv6_hdr(skb)->daddr;
959 uh = udp_hdr(skb);
960
961 ulen = ntohs(uh->len);
962 if (ulen > skb->len)
963 goto short_packet;
964
965 if (proto == IPPROTO_UDP) {
966 /* UDP validates ulen. */
967
968 /* Check for jumbo payload */
969 if (ulen == 0)
970 ulen = skb->len;
971
972 if (ulen < sizeof(*uh))
973 goto short_packet;
974
975 if (ulen < skb->len) {
976 if (pskb_trim_rcsum(skb, ulen))
977 goto short_packet;
978 saddr = &ipv6_hdr(skb)->saddr;
979 daddr = &ipv6_hdr(skb)->daddr;
980 uh = udp_hdr(skb);
981 }
982 }
983
984 if (udp6_csum_init(skb, uh, proto))
985 goto csum_error;
986
987 /* Check if the socket is already available, e.g. due to early demux */
988 sk = skb_steal_sock(skb, &refcounted);
989 if (sk) {
990 struct dst_entry *dst = skb_dst(skb);
991 int ret;
992
993 if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst))
994 udp6_sk_rx_dst_set(sk, dst);
995
996 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
997 if (refcounted)
998 sock_put(sk);
999 goto report_csum_error;
1000 }
1001
1002 ret = udp6_unicast_rcv_skb(sk, skb, uh);
1003 if (refcounted)
1004 sock_put(sk);
1005 return ret;
1006 }
1007
1008 /*
1009 * Multicast receive code
1010 */
1011 if (ipv6_addr_is_multicast(daddr))
1012 return __udp6_lib_mcast_deliver(net, skb,
1013 saddr, daddr, udptable, proto);
1014
1015 /* Unicast */
1016 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1017 if (sk) {
1018 if (!uh->check && !udp_sk(sk)->no_check6_rx)
1019 goto report_csum_error;
1020 return udp6_unicast_rcv_skb(sk, skb, uh);
1021 }
1022
1023 reason = SKB_DROP_REASON_NO_SOCKET;
1024
1025 if (!uh->check)
1026 goto report_csum_error;
1027
1028 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1029 goto discard;
1030
1031 if (udp_lib_checksum_complete(skb))
1032 goto csum_error;
1033
1034 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
1035 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
1036
1037 kfree_skb_reason(skb, reason);
1038 return 0;
1039
1040short_packet:
1041 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1042 reason = SKB_DROP_REASON_PKT_TOO_SMALL;
1043 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
1044 proto == IPPROTO_UDPLITE ? "-Lite" : "",
1045 saddr, ntohs(uh->source),
1046 ulen, skb->len,
1047 daddr, ntohs(uh->dest));
1048 goto discard;
1049
1050report_csum_error:
1051 udp6_csum_zero_error(skb);
1052csum_error:
1053 if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
1054 reason = SKB_DROP_REASON_UDP_CSUM;
1055 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1056discard:
1057 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1058 kfree_skb_reason(skb, reason);
1059 return 0;
1060}
1061
1062
1063static struct sock *__udp6_lib_demux_lookup(struct net *net,
1064 __be16 loc_port, const struct in6_addr *loc_addr,
1065 __be16 rmt_port, const struct in6_addr *rmt_addr,
1066 int dif, int sdif)
1067{
1068 struct udp_table *udptable = net->ipv4.udp_table;
1069 unsigned short hnum = ntohs(loc_port);
1070 unsigned int hash2, slot2;
1071 struct udp_hslot *hslot2;
1072 __portpair ports;
1073 struct sock *sk;
1074
1075 hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
1076 slot2 = hash2 & udptable->mask;
1077 hslot2 = &udptable->hash2[slot2];
1078 ports = INET_COMBINED_PORTS(rmt_port, hnum);
1079
1080 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
1081 if (sk->sk_state == TCP_ESTABLISHED &&
1082 inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif))
1083 return sk;
1084 /* Only check first socket in chain */
1085 break;
1086 }
1087 return NULL;
1088}
1089
1090void udp_v6_early_demux(struct sk_buff *skb)
1091{
1092 struct net *net = dev_net(skb->dev);
1093 const struct udphdr *uh;
1094 struct sock *sk;
1095 struct dst_entry *dst;
1096 int dif = skb->dev->ifindex;
1097 int sdif = inet6_sdif(skb);
1098
1099 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
1100 sizeof(struct udphdr)))
1101 return;
1102
1103 uh = udp_hdr(skb);
1104
1105 if (skb->pkt_type == PACKET_HOST)
1106 sk = __udp6_lib_demux_lookup(net, uh->dest,
1107 &ipv6_hdr(skb)->daddr,
1108 uh->source, &ipv6_hdr(skb)->saddr,
1109 dif, sdif);
1110 else
1111 return;
1112
1113 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
1114 return;
1115
1116 skb->sk = sk;
1117 skb->destructor = sock_efree;
1118 dst = rcu_dereference(sk->sk_rx_dst);
1119
1120 if (dst)
1121 dst = dst_check(dst, sk->sk_rx_dst_cookie);
1122 if (dst) {
1123 /* set noref for now.
1124 * any place which wants to hold dst has to call
1125 * dst_hold_safe()
1126 */
1127 skb_dst_set_noref(skb, dst);
1128 }
1129}
1130
1131INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1132{
1133 return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP);
1134}
1135
1136/*
1137 * Throw away all pending data and cancel the corking. Socket is locked.
1138 */
1139static void udp_v6_flush_pending_frames(struct sock *sk)
1140{
1141 struct udp_sock *up = udp_sk(sk);
1142
1143 if (up->pending == AF_INET)
1144 udp_flush_pending_frames(sk);
1145 else if (up->pending) {
1146 up->len = 0;
1147 up->pending = 0;
1148 ip6_flush_pending_frames(sk);
1149 }
1150}
1151
1152static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1153 int addr_len)
1154{
1155 if (addr_len < offsetofend(struct sockaddr, sa_family))
1156 return -EINVAL;
1157 /* The following checks are replicated from __ip6_datagram_connect()
1158 * and intended to prevent BPF program called below from accessing
1159 * bytes that are out of the bound specified by user in addr_len.
1160 */
1161 if (uaddr->sa_family == AF_INET) {
1162 if (ipv6_only_sock(sk))
1163 return -EAFNOSUPPORT;
1164 return udp_pre_connect(sk, uaddr, addr_len);
1165 }
1166
1167 if (addr_len < SIN6_LEN_RFC2133)
1168 return -EINVAL;
1169
1170 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1171}
1172
1173/**
1174 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
1175 * @sk: socket we are sending on
1176 * @skb: sk_buff containing the filled-in UDP header
1177 * (checksum field must be zeroed out)
1178 * @saddr: source address
1179 * @daddr: destination address
1180 * @len: length of packet
1181 */
1182static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1183 const struct in6_addr *saddr,
1184 const struct in6_addr *daddr, int len)
1185{
1186 unsigned int offset;
1187 struct udphdr *uh = udp_hdr(skb);
1188 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1189 __wsum csum = 0;
1190
1191 if (!frags) {
1192 /* Only one fragment on the socket. */
1193 skb->csum_start = skb_transport_header(skb) - skb->head;
1194 skb->csum_offset = offsetof(struct udphdr, check);
1195 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1196 } else {
1197 /*
1198 * HW-checksum won't work as there are two or more
1199 * fragments on the socket so that all csums of sk_buffs
1200 * should be together
1201 */
1202 offset = skb_transport_offset(skb);
1203 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1204 csum = skb->csum;
1205
1206 skb->ip_summed = CHECKSUM_NONE;
1207
1208 do {
1209 csum = csum_add(csum, frags->csum);
1210 } while ((frags = frags->next));
1211
1212 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1213 csum);
1214 if (uh->check == 0)
1215 uh->check = CSUM_MANGLED_0;
1216 }
1217}
1218
1219/*
1220 * Sending
1221 */
1222
1223static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1224 struct inet_cork *cork)
1225{
1226 struct sock *sk = skb->sk;
1227 struct udphdr *uh;
1228 int err = 0;
1229 int is_udplite = IS_UDPLITE(sk);
1230 __wsum csum = 0;
1231 int offset = skb_transport_offset(skb);
1232 int len = skb->len - offset;
1233 int datalen = len - sizeof(*uh);
1234
1235 /*
1236 * Create a UDP header
1237 */
1238 uh = udp_hdr(skb);
1239 uh->source = fl6->fl6_sport;
1240 uh->dest = fl6->fl6_dport;
1241 uh->len = htons(len);
1242 uh->check = 0;
1243
1244 if (cork->gso_size) {
1245 const int hlen = skb_network_header_len(skb) +
1246 sizeof(struct udphdr);
1247
1248 if (hlen + cork->gso_size > cork->fragsize) {
1249 kfree_skb(skb);
1250 return -EINVAL;
1251 }
1252 if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
1253 kfree_skb(skb);
1254 return -EINVAL;
1255 }
1256 if (udp_sk(sk)->no_check6_tx) {
1257 kfree_skb(skb);
1258 return -EINVAL;
1259 }
1260 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1261 dst_xfrm(skb_dst(skb))) {
1262 kfree_skb(skb);
1263 return -EIO;
1264 }
1265
1266 if (datalen > cork->gso_size) {
1267 skb_shinfo(skb)->gso_size = cork->gso_size;
1268 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1269 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
1270 cork->gso_size);
1271 }
1272 goto csum_partial;
1273 }
1274
1275 if (is_udplite)
1276 csum = udplite_csum(skb);
1277 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
1278 skb->ip_summed = CHECKSUM_NONE;
1279 goto send;
1280 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
1281csum_partial:
1282 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1283 goto send;
1284 } else
1285 csum = udp_csum(skb);
1286
1287 /* add protocol-dependent pseudo-header */
1288 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1289 len, fl6->flowi6_proto, csum);
1290 if (uh->check == 0)
1291 uh->check = CSUM_MANGLED_0;
1292
1293send:
1294 err = ip6_send_skb(skb);
1295 if (err) {
1296 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1297 UDP6_INC_STATS(sock_net(sk),
1298 UDP_MIB_SNDBUFERRORS, is_udplite);
1299 err = 0;
1300 }
1301 } else {
1302 UDP6_INC_STATS(sock_net(sk),
1303 UDP_MIB_OUTDATAGRAMS, is_udplite);
1304 }
1305 return err;
1306}
1307
1308static int udp_v6_push_pending_frames(struct sock *sk)
1309{
1310 struct sk_buff *skb;
1311 struct udp_sock *up = udp_sk(sk);
1312 int err = 0;
1313
1314 if (up->pending == AF_INET)
1315 return udp_push_pending_frames(sk);
1316
1317 skb = ip6_finish_skb(sk);
1318 if (!skb)
1319 goto out;
1320
1321 err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6,
1322 &inet_sk(sk)->cork.base);
1323out:
1324 up->len = 0;
1325 up->pending = 0;
1326 return err;
1327}
1328
1329int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1330{
1331 struct ipv6_txoptions opt_space;
1332 struct udp_sock *up = udp_sk(sk);
1333 struct inet_sock *inet = inet_sk(sk);
1334 struct ipv6_pinfo *np = inet6_sk(sk);
1335 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1336 struct in6_addr *daddr, *final_p, final;
1337 struct ipv6_txoptions *opt = NULL;
1338 struct ipv6_txoptions *opt_to_free = NULL;
1339 struct ip6_flowlabel *flowlabel = NULL;
1340 struct inet_cork_full cork;
1341 struct flowi6 *fl6 = &cork.fl.u.ip6;
1342 struct dst_entry *dst;
1343 struct ipcm6_cookie ipc6;
1344 int addr_len = msg->msg_namelen;
1345 bool connected = false;
1346 int ulen = len;
1347 int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
1348 int err;
1349 int is_udplite = IS_UDPLITE(sk);
1350 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1351
1352 ipcm6_init(&ipc6);
1353 ipc6.gso_size = READ_ONCE(up->gso_size);
1354 ipc6.sockc.tsflags = sk->sk_tsflags;
1355 ipc6.sockc.mark = sk->sk_mark;
1356
1357 /* destination address check */
1358 if (sin6) {
1359 if (addr_len < offsetof(struct sockaddr, sa_data))
1360 return -EINVAL;
1361
1362 switch (sin6->sin6_family) {
1363 case AF_INET6:
1364 if (addr_len < SIN6_LEN_RFC2133)
1365 return -EINVAL;
1366 daddr = &sin6->sin6_addr;
1367 if (ipv6_addr_any(daddr) &&
1368 ipv6_addr_v4mapped(&np->saddr))
1369 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1370 daddr);
1371 break;
1372 case AF_INET:
1373 goto do_udp_sendmsg;
1374 case AF_UNSPEC:
1375 msg->msg_name = sin6 = NULL;
1376 msg->msg_namelen = addr_len = 0;
1377 daddr = NULL;
1378 break;
1379 default:
1380 return -EINVAL;
1381 }
1382 } else if (!up->pending) {
1383 if (sk->sk_state != TCP_ESTABLISHED)
1384 return -EDESTADDRREQ;
1385 daddr = &sk->sk_v6_daddr;
1386 } else
1387 daddr = NULL;
1388
1389 if (daddr) {
1390 if (ipv6_addr_v4mapped(daddr)) {
1391 struct sockaddr_in sin;
1392 sin.sin_family = AF_INET;
1393 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1394 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1395 msg->msg_name = &sin;
1396 msg->msg_namelen = sizeof(sin);
1397do_udp_sendmsg:
1398 if (ipv6_only_sock(sk))
1399 return -ENETUNREACH;
1400 return udp_sendmsg(sk, msg, len);
1401 }
1402 }
1403
1404 /* Rough check on arithmetic overflow,
1405 better check is made in ip6_append_data().
1406 */
1407 if (len > INT_MAX - sizeof(struct udphdr))
1408 return -EMSGSIZE;
1409
1410 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1411 if (up->pending) {
1412 if (up->pending == AF_INET)
1413 return udp_sendmsg(sk, msg, len);
1414 /*
1415 * There are pending frames.
1416 * The socket lock must be held while it's corked.
1417 */
1418 lock_sock(sk);
1419 if (likely(up->pending)) {
1420 if (unlikely(up->pending != AF_INET6)) {
1421 release_sock(sk);
1422 return -EAFNOSUPPORT;
1423 }
1424 dst = NULL;
1425 goto do_append_data;
1426 }
1427 release_sock(sk);
1428 }
1429 ulen += sizeof(struct udphdr);
1430
1431 memset(fl6, 0, sizeof(*fl6));
1432
1433 if (sin6) {
1434 if (sin6->sin6_port == 0)
1435 return -EINVAL;
1436
1437 fl6->fl6_dport = sin6->sin6_port;
1438 daddr = &sin6->sin6_addr;
1439
1440 if (np->sndflow) {
1441 fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1442 if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) {
1443 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1444 if (IS_ERR(flowlabel))
1445 return -EINVAL;
1446 }
1447 }
1448
1449 /*
1450 * Otherwise it will be difficult to maintain
1451 * sk->sk_dst_cache.
1452 */
1453 if (sk->sk_state == TCP_ESTABLISHED &&
1454 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1455 daddr = &sk->sk_v6_daddr;
1456
1457 if (addr_len >= sizeof(struct sockaddr_in6) &&
1458 sin6->sin6_scope_id &&
1459 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1460 fl6->flowi6_oif = sin6->sin6_scope_id;
1461 } else {
1462 if (sk->sk_state != TCP_ESTABLISHED)
1463 return -EDESTADDRREQ;
1464
1465 fl6->fl6_dport = inet->inet_dport;
1466 daddr = &sk->sk_v6_daddr;
1467 fl6->flowlabel = np->flow_label;
1468 connected = true;
1469 }
1470
1471 if (!fl6->flowi6_oif)
1472 fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if);
1473
1474 if (!fl6->flowi6_oif)
1475 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1476
1477 fl6->flowi6_uid = sk->sk_uid;
1478
1479 if (msg->msg_controllen) {
1480 opt = &opt_space;
1481 memset(opt, 0, sizeof(struct ipv6_txoptions));
1482 opt->tot_len = sizeof(*opt);
1483 ipc6.opt = opt;
1484
1485 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1486 if (err > 0)
1487 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6,
1488 &ipc6);
1489 if (err < 0) {
1490 fl6_sock_release(flowlabel);
1491 return err;
1492 }
1493 if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1494 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
1495 if (IS_ERR(flowlabel))
1496 return -EINVAL;
1497 }
1498 if (!(opt->opt_nflen|opt->opt_flen))
1499 opt = NULL;
1500 connected = false;
1501 }
1502 if (!opt) {
1503 opt = txopt_get(np);
1504 opt_to_free = opt;
1505 }
1506 if (flowlabel)
1507 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1508 opt = ipv6_fixup_options(&opt_space, opt);
1509 ipc6.opt = opt;
1510
1511 fl6->flowi6_proto = sk->sk_protocol;
1512 fl6->flowi6_mark = ipc6.sockc.mark;
1513 fl6->daddr = *daddr;
1514 if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr))
1515 fl6->saddr = np->saddr;
1516 fl6->fl6_sport = inet->inet_sport;
1517
1518 if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) {
1519 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1520 (struct sockaddr *)sin6,
1521 &fl6->saddr);
1522 if (err)
1523 goto out_no_dst;
1524 if (sin6) {
1525 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1526 /* BPF program rewrote IPv6-only by IPv4-mapped
1527 * IPv6. It's currently unsupported.
1528 */
1529 err = -ENOTSUPP;
1530 goto out_no_dst;
1531 }
1532 if (sin6->sin6_port == 0) {
1533 /* BPF program set invalid port. Reject it. */
1534 err = -EINVAL;
1535 goto out_no_dst;
1536 }
1537 fl6->fl6_dport = sin6->sin6_port;
1538 fl6->daddr = sin6->sin6_addr;
1539 }
1540 }
1541
1542 if (ipv6_addr_any(&fl6->daddr))
1543 fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1544
1545 final_p = fl6_update_dst(fl6, opt, &final);
1546 if (final_p)
1547 connected = false;
1548
1549 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) {
1550 fl6->flowi6_oif = np->mcast_oif;
1551 connected = false;
1552 } else if (!fl6->flowi6_oif)
1553 fl6->flowi6_oif = np->ucast_oif;
1554
1555 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
1556
1557 if (ipc6.tclass < 0)
1558 ipc6.tclass = np->tclass;
1559
1560 fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel);
1561
1562 dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected);
1563 if (IS_ERR(dst)) {
1564 err = PTR_ERR(dst);
1565 dst = NULL;
1566 goto out;
1567 }
1568
1569 if (ipc6.hlimit < 0)
1570 ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst);
1571
1572 if (msg->msg_flags&MSG_CONFIRM)
1573 goto do_confirm;
1574back_from_confirm:
1575
1576 /* Lockless fast path for the non-corking case */
1577 if (!corkreq) {
1578 struct sk_buff *skb;
1579
1580 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1581 sizeof(struct udphdr), &ipc6,
1582 (struct rt6_info *)dst,
1583 msg->msg_flags, &cork);
1584 err = PTR_ERR(skb);
1585 if (!IS_ERR_OR_NULL(skb))
1586 err = udp_v6_send_skb(skb, fl6, &cork.base);
1587 /* ip6_make_skb steals dst reference */
1588 goto out_no_dst;
1589 }
1590
1591 lock_sock(sk);
1592 if (unlikely(up->pending)) {
1593 /* The socket is already corked while preparing it. */
1594 /* ... which is an evident application bug. --ANK */
1595 release_sock(sk);
1596
1597 net_dbg_ratelimited("udp cork app bug 2\n");
1598 err = -EINVAL;
1599 goto out;
1600 }
1601
1602 up->pending = AF_INET6;
1603
1604do_append_data:
1605 if (ipc6.dontfrag < 0)
1606 ipc6.dontfrag = np->dontfrag;
1607 up->len += ulen;
1608 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1609 &ipc6, fl6, (struct rt6_info *)dst,
1610 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1611 if (err)
1612 udp_v6_flush_pending_frames(sk);
1613 else if (!corkreq)
1614 err = udp_v6_push_pending_frames(sk);
1615 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1616 up->pending = 0;
1617
1618 if (err > 0)
1619 err = np->recverr ? net_xmit_errno(err) : 0;
1620 release_sock(sk);
1621
1622out:
1623 dst_release(dst);
1624out_no_dst:
1625 fl6_sock_release(flowlabel);
1626 txopt_put(opt_to_free);
1627 if (!err)
1628 return len;
1629 /*
1630 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1631 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1632 * we don't have a good statistic (IpOutDiscards but it can be too many
1633 * things). We could add another new stat but at least for now that
1634 * seems like overkill.
1635 */
1636 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1637 UDP6_INC_STATS(sock_net(sk),
1638 UDP_MIB_SNDBUFERRORS, is_udplite);
1639 }
1640 return err;
1641
1642do_confirm:
1643 if (msg->msg_flags & MSG_PROBE)
1644 dst_confirm_neigh(dst, &fl6->daddr);
1645 if (!(msg->msg_flags&MSG_PROBE) || len)
1646 goto back_from_confirm;
1647 err = 0;
1648 goto out;
1649}
1650EXPORT_SYMBOL(udpv6_sendmsg);
1651
1652void udpv6_destroy_sock(struct sock *sk)
1653{
1654 struct udp_sock *up = udp_sk(sk);
1655 lock_sock(sk);
1656
1657 /* protects from races with udp_abort() */
1658 sock_set_flag(sk, SOCK_DEAD);
1659 udp_v6_flush_pending_frames(sk);
1660 release_sock(sk);
1661
1662 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1663 if (up->encap_type) {
1664 void (*encap_destroy)(struct sock *sk);
1665 encap_destroy = READ_ONCE(up->encap_destroy);
1666 if (encap_destroy)
1667 encap_destroy(sk);
1668 }
1669 if (up->encap_enabled) {
1670 static_branch_dec(&udpv6_encap_needed_key);
1671 udp_encap_disable();
1672 }
1673 }
1674}
1675
1676/*
1677 * Socket option code for UDP
1678 */
1679int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1680 unsigned int optlen)
1681{
1682 if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET)
1683 return udp_lib_setsockopt(sk, level, optname,
1684 optval, optlen,
1685 udp_v6_push_pending_frames);
1686 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1687}
1688
1689int udpv6_getsockopt(struct sock *sk, int level, int optname,
1690 char __user *optval, int __user *optlen)
1691{
1692 if (level == SOL_UDP || level == SOL_UDPLITE)
1693 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1694 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1695}
1696
1697static const struct inet6_protocol udpv6_protocol = {
1698 .handler = udpv6_rcv,
1699 .err_handler = udpv6_err,
1700 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1701};
1702
1703/* ------------------------------------------------------------------------ */
1704#ifdef CONFIG_PROC_FS
1705int udp6_seq_show(struct seq_file *seq, void *v)
1706{
1707 if (v == SEQ_START_TOKEN) {
1708 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1709 } else {
1710 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1711 struct inet_sock *inet = inet_sk(v);
1712 __u16 srcp = ntohs(inet->inet_sport);
1713 __u16 destp = ntohs(inet->inet_dport);
1714 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1715 udp_rqueue_get(v), bucket);
1716 }
1717 return 0;
1718}
1719
1720const struct seq_operations udp6_seq_ops = {
1721 .start = udp_seq_start,
1722 .next = udp_seq_next,
1723 .stop = udp_seq_stop,
1724 .show = udp6_seq_show,
1725};
1726EXPORT_SYMBOL(udp6_seq_ops);
1727
1728static struct udp_seq_afinfo udp6_seq_afinfo = {
1729 .family = AF_INET6,
1730 .udp_table = NULL,
1731};
1732
1733int __net_init udp6_proc_init(struct net *net)
1734{
1735 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1736 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1737 return -ENOMEM;
1738 return 0;
1739}
1740
1741void udp6_proc_exit(struct net *net)
1742{
1743 remove_proc_entry("udp6", net->proc_net);
1744}
1745#endif /* CONFIG_PROC_FS */
1746
1747/* ------------------------------------------------------------------------ */
1748
1749struct proto udpv6_prot = {
1750 .name = "UDPv6",
1751 .owner = THIS_MODULE,
1752 .close = udp_lib_close,
1753 .pre_connect = udpv6_pre_connect,
1754 .connect = ip6_datagram_connect,
1755 .disconnect = udp_disconnect,
1756 .ioctl = udp_ioctl,
1757 .init = udpv6_init_sock,
1758 .destroy = udpv6_destroy_sock,
1759 .setsockopt = udpv6_setsockopt,
1760 .getsockopt = udpv6_getsockopt,
1761 .sendmsg = udpv6_sendmsg,
1762 .recvmsg = udpv6_recvmsg,
1763 .release_cb = ip6_datagram_release_cb,
1764 .hash = udp_lib_hash,
1765 .unhash = udp_lib_unhash,
1766 .rehash = udp_v6_rehash,
1767 .get_port = udp_v6_get_port,
1768 .put_port = udp_lib_unhash,
1769#ifdef CONFIG_BPF_SYSCALL
1770 .psock_update_sk_prot = udp_bpf_update_proto,
1771#endif
1772
1773 .memory_allocated = &udp_memory_allocated,
1774 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc,
1775
1776 .sysctl_mem = sysctl_udp_mem,
1777 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1778 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1779 .obj_size = sizeof(struct udp6_sock),
1780 .h.udp_table = NULL,
1781 .diag_destroy = udp_abort,
1782};
1783
1784static struct inet_protosw udpv6_protosw = {
1785 .type = SOCK_DGRAM,
1786 .protocol = IPPROTO_UDP,
1787 .prot = &udpv6_prot,
1788 .ops = &inet6_dgram_ops,
1789 .flags = INET_PROTOSW_PERMANENT,
1790};
1791
1792int __init udpv6_init(void)
1793{
1794 int ret;
1795
1796 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1797 if (ret)
1798 goto out;
1799
1800 ret = inet6_register_protosw(&udpv6_protosw);
1801 if (ret)
1802 goto out_udpv6_protocol;
1803out:
1804 return ret;
1805
1806out_udpv6_protocol:
1807 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1808 goto out;
1809}
1810
1811void udpv6_exit(void)
1812{
1813 inet6_unregister_protosw(&udpv6_protosw);
1814 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1815}