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20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/socket.h>
23#include <linux/sockios.h>
24#include <linux/net.h>
25#include <linux/in6.h>
26#include <linux/netdevice.h>
27#include <linux/if_arp.h>
28#include <linux/ipv6.h>
29#include <linux/icmpv6.h>
30#include <linux/init.h>
31#include <linux/module.h>
32#include <linux/skbuff.h>
33#include <linux/slab.h>
34#include <linux/uaccess.h>
35#include <linux/indirect_call_wrapper.h>
36
37#include <net/addrconf.h>
38#include <net/ndisc.h>
39#include <net/protocol.h>
40#include <net/transp_v6.h>
41#include <net/ip6_route.h>
42#include <net/raw.h>
43#include <net/tcp_states.h>
44#include <net/ip6_checksum.h>
45#include <net/ip6_tunnel.h>
46#include <net/xfrm.h>
47#include <net/inet_hashtables.h>
48#include <net/inet6_hashtables.h>
49#include <net/busy_poll.h>
50#include <net/sock_reuseport.h>
51
52#include <linux/proc_fs.h>
53#include <linux/seq_file.h>
54#include <trace/events/skb.h>
55#include "udp_impl.h"
56
57static u32 udp6_ehashfn(const struct net *net,
58 const struct in6_addr *laddr,
59 const u16 lport,
60 const struct in6_addr *faddr,
61 const __be16 fport)
62{
63 static u32 udp6_ehash_secret __read_mostly;
64 static u32 udp_ipv6_hash_secret __read_mostly;
65
66 u32 lhash, fhash;
67
68 net_get_random_once(&udp6_ehash_secret,
69 sizeof(udp6_ehash_secret));
70 net_get_random_once(&udp_ipv6_hash_secret,
71 sizeof(udp_ipv6_hash_secret));
72
73 lhash = (__force u32)laddr->s6_addr32[3];
74 fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
75
76 return __inet6_ehashfn(lhash, lport, fhash, fport,
77 udp_ipv6_hash_secret + net_hash_mix(net));
78}
79
80int udp_v6_get_port(struct sock *sk, unsigned short snum)
81{
82 unsigned int hash2_nulladdr =
83 ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
84 unsigned int hash2_partial =
85 ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
86
87
88 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
89 return udp_lib_get_port(sk, snum, hash2_nulladdr);
90}
91
92void udp_v6_rehash(struct sock *sk)
93{
94 u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
95 &sk->sk_v6_rcv_saddr,
96 inet_sk(sk)->inet_num);
97
98 udp_lib_rehash(sk, new_hash);
99}
100
101static int compute_score(struct sock *sk, struct net *net,
102 const struct in6_addr *saddr, __be16 sport,
103 const struct in6_addr *daddr, unsigned short hnum,
104 int dif, int sdif)
105{
106 int score;
107 struct inet_sock *inet;
108 bool dev_match;
109
110 if (!net_eq(sock_net(sk), net) ||
111 udp_sk(sk)->udp_port_hash != hnum ||
112 sk->sk_family != PF_INET6)
113 return -1;
114
115 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
116 return -1;
117
118 score = 0;
119 inet = inet_sk(sk);
120
121 if (inet->inet_dport) {
122 if (inet->inet_dport != sport)
123 return -1;
124 score++;
125 }
126
127 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
128 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
129 return -1;
130 score++;
131 }
132
133 dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif);
134 if (!dev_match)
135 return -1;
136 score++;
137
138 if (sk->sk_incoming_cpu == raw_smp_processor_id())
139 score++;
140
141 return score;
142}
143
144
145static struct sock *udp6_lib_lookup2(struct net *net,
146 const struct in6_addr *saddr, __be16 sport,
147 const struct in6_addr *daddr, unsigned int hnum,
148 int dif, int sdif, struct udp_hslot *hslot2,
149 struct sk_buff *skb)
150{
151 struct sock *sk, *result;
152 int score, badness;
153 u32 hash = 0;
154
155 result = NULL;
156 badness = -1;
157 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
158 score = compute_score(sk, net, saddr, sport,
159 daddr, hnum, dif, sdif);
160 if (score > badness) {
161 if (sk->sk_reuseport) {
162 hash = udp6_ehashfn(net, daddr, hnum,
163 saddr, sport);
164
165 result = reuseport_select_sock(sk, hash, skb,
166 sizeof(struct udphdr));
167 if (result)
168 return result;
169 }
170 result = sk;
171 badness = score;
172 }
173 }
174 return result;
175}
176
177
178struct sock *__udp6_lib_lookup(struct net *net,
179 const struct in6_addr *saddr, __be16 sport,
180 const struct in6_addr *daddr, __be16 dport,
181 int dif, int sdif, struct udp_table *udptable,
182 struct sk_buff *skb)
183{
184 unsigned short hnum = ntohs(dport);
185 unsigned int hash2, slot2;
186 struct udp_hslot *hslot2;
187 struct sock *result;
188
189 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
190 slot2 = hash2 & udptable->mask;
191 hslot2 = &udptable->hash2[slot2];
192
193 result = udp6_lib_lookup2(net, saddr, sport,
194 daddr, hnum, dif, sdif,
195 hslot2, skb);
196 if (!result) {
197 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
198 slot2 = hash2 & udptable->mask;
199
200 hslot2 = &udptable->hash2[slot2];
201
202 result = udp6_lib_lookup2(net, saddr, sport,
203 &in6addr_any, hnum, dif, sdif,
204 hslot2, skb);
205 }
206 if (IS_ERR(result))
207 return NULL;
208 return result;
209}
210EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
211
212static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
213 __be16 sport, __be16 dport,
214 struct udp_table *udptable)
215{
216 const struct ipv6hdr *iph = ipv6_hdr(skb);
217
218 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
219 &iph->daddr, dport, inet6_iif(skb),
220 inet6_sdif(skb), udptable, skb);
221}
222
223struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
224 __be16 sport, __be16 dport)
225{
226 const struct ipv6hdr *iph = ipv6_hdr(skb);
227
228 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
229 &iph->daddr, dport, inet6_iif(skb),
230 inet6_sdif(skb), &udp_table, NULL);
231}
232EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
233
234
235
236
237#if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6)
238struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
239 const struct in6_addr *daddr, __be16 dport, int dif)
240{
241 struct sock *sk;
242
243 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
244 dif, 0, &udp_table, NULL);
245 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
246 sk = NULL;
247 return sk;
248}
249EXPORT_SYMBOL_GPL(udp6_lib_lookup);
250#endif
251
252
253
254
255
256static int udp6_skb_len(struct sk_buff *skb)
257{
258 return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb);
259}
260
261
262
263
264
265
266int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
267 int noblock, int flags, int *addr_len)
268{
269 struct ipv6_pinfo *np = inet6_sk(sk);
270 struct inet_sock *inet = inet_sk(sk);
271 struct sk_buff *skb;
272 unsigned int ulen, copied;
273 int off, err, peeking = flags & MSG_PEEK;
274 int is_udplite = IS_UDPLITE(sk);
275 struct udp_mib __percpu *mib;
276 bool checksum_valid = false;
277 int is_udp4;
278
279 if (flags & MSG_ERRQUEUE)
280 return ipv6_recv_error(sk, msg, len, addr_len);
281
282 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
283 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
284
285try_again:
286 off = sk_peek_offset(sk, flags);
287 skb = __skb_recv_udp(sk, flags, noblock, &off, &err);
288 if (!skb)
289 return err;
290
291 ulen = udp6_skb_len(skb);
292 copied = len;
293 if (copied > ulen - off)
294 copied = ulen - off;
295 else if (copied < ulen)
296 msg->msg_flags |= MSG_TRUNC;
297
298 is_udp4 = (skb->protocol == htons(ETH_P_IP));
299 mib = __UDPX_MIB(sk, is_udp4);
300
301
302
303
304
305
306
307 if (copied < ulen || peeking ||
308 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
309 checksum_valid = udp_skb_csum_unnecessary(skb) ||
310 !__udp_lib_checksum_complete(skb);
311 if (!checksum_valid)
312 goto csum_copy_err;
313 }
314
315 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
316 if (udp_skb_is_linear(skb))
317 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
318 else
319 err = skb_copy_datagram_msg(skb, off, msg, copied);
320 } else {
321 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
322 if (err == -EINVAL)
323 goto csum_copy_err;
324 }
325 if (unlikely(err)) {
326 if (!peeking) {
327 atomic_inc(&sk->sk_drops);
328 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
329 }
330 kfree_skb(skb);
331 return err;
332 }
333 if (!peeking)
334 SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS);
335
336 sock_recv_ts_and_drops(msg, sk, skb);
337
338
339 if (msg->msg_name) {
340 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
341 sin6->sin6_family = AF_INET6;
342 sin6->sin6_port = udp_hdr(skb)->source;
343 sin6->sin6_flowinfo = 0;
344
345 if (is_udp4) {
346 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
347 &sin6->sin6_addr);
348 sin6->sin6_scope_id = 0;
349 } else {
350 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
351 sin6->sin6_scope_id =
352 ipv6_iface_scope_id(&sin6->sin6_addr,
353 inet6_iif(skb));
354 }
355 *addr_len = sizeof(*sin6);
356
357 if (cgroup_bpf_enabled)
358 BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk,
359 (struct sockaddr *)sin6);
360 }
361
362 if (udp_sk(sk)->gro_enabled)
363 udp_cmsg_recv(msg, sk, skb);
364
365 if (np->rxopt.all)
366 ip6_datagram_recv_common_ctl(sk, msg, skb);
367
368 if (is_udp4) {
369 if (inet->cmsg_flags)
370 ip_cmsg_recv_offset(msg, sk, skb,
371 sizeof(struct udphdr), off);
372 } else {
373 if (np->rxopt.all)
374 ip6_datagram_recv_specific_ctl(sk, msg, skb);
375 }
376
377 err = copied;
378 if (flags & MSG_TRUNC)
379 err = ulen;
380
381 skb_consume_udp(sk, skb, peeking ? -err : err);
382 return err;
383
384csum_copy_err:
385 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
386 udp_skb_destructor)) {
387 SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS);
388 SNMP_INC_STATS(mib, UDP_MIB_INERRORS);
389 }
390 kfree_skb(skb);
391
392
393 cond_resched();
394 msg->msg_flags &= ~MSG_TRUNC;
395 goto try_again;
396}
397
398DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
399void udpv6_encap_enable(void)
400{
401 static_branch_inc(&udpv6_encap_needed_key);
402}
403EXPORT_SYMBOL(udpv6_encap_enable);
404
405
406
407
408static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb,
409 struct inet6_skb_parm *opt,
410 u8 type, u8 code, int offset, __be32 info)
411{
412 int i;
413
414 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
415 int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
416 u8 type, u8 code, int offset, __be32 info);
417 const struct ip6_tnl_encap_ops *encap;
418
419 encap = rcu_dereference(ip6tun_encaps[i]);
420 if (!encap)
421 continue;
422 handler = encap->err_handler;
423 if (handler && !handler(skb, opt, type, code, offset, info))
424 return 0;
425 }
426
427 return -ENOENT;
428}
429
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443
444
445
446
447static struct sock *__udp6_lib_err_encap(struct net *net,
448 const struct ipv6hdr *hdr, int offset,
449 struct udphdr *uh,
450 struct udp_table *udptable,
451 struct sk_buff *skb,
452 struct inet6_skb_parm *opt,
453 u8 type, u8 code, __be32 info)
454{
455 int network_offset, transport_offset;
456 struct sock *sk;
457
458 network_offset = skb_network_offset(skb);
459 transport_offset = skb_transport_offset(skb);
460
461
462 skb_reset_network_header(skb);
463
464
465 skb_set_transport_header(skb, offset);
466
467 sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source,
468 &hdr->saddr, uh->dest,
469 inet6_iif(skb), 0, udptable, skb);
470 if (sk) {
471 int (*lookup)(struct sock *sk, struct sk_buff *skb);
472 struct udp_sock *up = udp_sk(sk);
473
474 lookup = READ_ONCE(up->encap_err_lookup);
475 if (!lookup || lookup(sk, skb))
476 sk = NULL;
477 }
478
479 if (!sk) {
480 sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code,
481 offset, info));
482 }
483
484 skb_set_transport_header(skb, transport_offset);
485 skb_set_network_header(skb, network_offset);
486
487 return sk;
488}
489
490int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
491 u8 type, u8 code, int offset, __be32 info,
492 struct udp_table *udptable)
493{
494 struct ipv6_pinfo *np;
495 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
496 const struct in6_addr *saddr = &hdr->saddr;
497 const struct in6_addr *daddr = &hdr->daddr;
498 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
499 bool tunnel = false;
500 struct sock *sk;
501 int harderr;
502 int err;
503 struct net *net = dev_net(skb->dev);
504
505 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
506 inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
507 if (!sk) {
508
509 sk = ERR_PTR(-ENOENT);
510 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
511 sk = __udp6_lib_err_encap(net, hdr, offset, uh,
512 udptable, skb,
513 opt, type, code, info);
514 if (!sk)
515 return 0;
516 }
517
518 if (IS_ERR(sk)) {
519 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
520 ICMP6_MIB_INERRORS);
521 return PTR_ERR(sk);
522 }
523
524 tunnel = true;
525 }
526
527 harderr = icmpv6_err_convert(type, code, &err);
528 np = inet6_sk(sk);
529
530 if (type == ICMPV6_PKT_TOOBIG) {
531 if (!ip6_sk_accept_pmtu(sk))
532 goto out;
533 ip6_sk_update_pmtu(skb, sk, info);
534 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
535 harderr = 1;
536 }
537 if (type == NDISC_REDIRECT) {
538 if (tunnel) {
539 ip6_redirect(skb, sock_net(sk), inet6_iif(skb),
540 sk->sk_mark, sk->sk_uid);
541 } else {
542 ip6_sk_redirect(skb, sk);
543 }
544 goto out;
545 }
546
547
548 if (tunnel)
549 goto out;
550
551 if (!np->recverr) {
552 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
553 goto out;
554 } else {
555 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
556 }
557
558 sk->sk_err = err;
559 sk->sk_error_report(sk);
560out:
561 return 0;
562}
563
564static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
565{
566 int rc;
567
568 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
569 sock_rps_save_rxhash(sk, skb);
570 sk_mark_napi_id(sk, skb);
571 sk_incoming_cpu_update(sk);
572 } else {
573 sk_mark_napi_id_once(sk, skb);
574 }
575
576 rc = __udp_enqueue_schedule_skb(sk, skb);
577 if (rc < 0) {
578 int is_udplite = IS_UDPLITE(sk);
579
580
581 if (rc == -ENOMEM)
582 UDP6_INC_STATS(sock_net(sk),
583 UDP_MIB_RCVBUFERRORS, is_udplite);
584 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
585 kfree_skb(skb);
586 return -1;
587 }
588
589 return 0;
590}
591
592static __inline__ int udpv6_err(struct sk_buff *skb,
593 struct inet6_skb_parm *opt, u8 type,
594 u8 code, int offset, __be32 info)
595{
596 return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
597}
598
599static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
600{
601 struct udp_sock *up = udp_sk(sk);
602 int is_udplite = IS_UDPLITE(sk);
603
604 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
605 goto drop;
606
607 if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) {
608 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
609
610
611
612
613
614
615
616
617
618
619
620
621
622 encap_rcv = READ_ONCE(up->encap_rcv);
623 if (encap_rcv) {
624 int ret;
625
626
627 if (udp_lib_checksum_complete(skb))
628 goto csum_error;
629
630 ret = encap_rcv(sk, skb);
631 if (ret <= 0) {
632 __UDP_INC_STATS(sock_net(sk),
633 UDP_MIB_INDATAGRAMS,
634 is_udplite);
635 return -ret;
636 }
637 }
638
639
640 }
641
642
643
644
645 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
646
647 if (up->pcrlen == 0) {
648 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
649 UDP_SKB_CB(skb)->cscov, skb->len);
650 goto drop;
651 }
652 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
653 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
654 UDP_SKB_CB(skb)->cscov, up->pcrlen);
655 goto drop;
656 }
657 }
658
659 prefetch(&sk->sk_rmem_alloc);
660 if (rcu_access_pointer(sk->sk_filter) &&
661 udp_lib_checksum_complete(skb))
662 goto csum_error;
663
664 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
665 goto drop;
666
667 udp_csum_pull_header(skb);
668
669 skb_dst_drop(skb);
670
671 return __udpv6_queue_rcv_skb(sk, skb);
672
673csum_error:
674 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
675drop:
676 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
677 atomic_inc(&sk->sk_drops);
678 kfree_skb(skb);
679 return -1;
680}
681
682static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
683{
684 struct sk_buff *next, *segs;
685 int ret;
686
687 if (likely(!udp_unexpected_gso(sk, skb)))
688 return udpv6_queue_rcv_one_skb(sk, skb);
689
690 __skb_push(skb, -skb_mac_offset(skb));
691 segs = udp_rcv_segment(sk, skb, false);
692 for (skb = segs; skb; skb = next) {
693 next = skb->next;
694 __skb_pull(skb, skb_transport_offset(skb));
695
696 ret = udpv6_queue_rcv_one_skb(sk, skb);
697 if (ret > 0)
698 ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret,
699 true);
700 }
701 return 0;
702}
703
704static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
705 __be16 loc_port, const struct in6_addr *loc_addr,
706 __be16 rmt_port, const struct in6_addr *rmt_addr,
707 int dif, int sdif, unsigned short hnum)
708{
709 struct inet_sock *inet = inet_sk(sk);
710
711 if (!net_eq(sock_net(sk), net))
712 return false;
713
714 if (udp_sk(sk)->udp_port_hash != hnum ||
715 sk->sk_family != PF_INET6 ||
716 (inet->inet_dport && inet->inet_dport != rmt_port) ||
717 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
718 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
719 !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) ||
720 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
721 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
722 return false;
723 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
724 return false;
725 return true;
726}
727
728static void udp6_csum_zero_error(struct sk_buff *skb)
729{
730
731
732
733 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
734 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
735 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
736}
737
738
739
740
741
742static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
743 const struct in6_addr *saddr, const struct in6_addr *daddr,
744 struct udp_table *udptable, int proto)
745{
746 struct sock *sk, *first = NULL;
747 const struct udphdr *uh = udp_hdr(skb);
748 unsigned short hnum = ntohs(uh->dest);
749 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
750 unsigned int offset = offsetof(typeof(*sk), sk_node);
751 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
752 int dif = inet6_iif(skb);
753 int sdif = inet6_sdif(skb);
754 struct hlist_node *node;
755 struct sk_buff *nskb;
756
757 if (use_hash2) {
758 hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
759 udptable->mask;
760 hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
761start_lookup:
762 hslot = &udptable->hash2[hash2];
763 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
764 }
765
766 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
767 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
768 uh->source, saddr, dif, sdif,
769 hnum))
770 continue;
771
772
773
774 if (!uh->check && !udp_sk(sk)->no_check6_rx)
775 continue;
776 if (!first) {
777 first = sk;
778 continue;
779 }
780 nskb = skb_clone(skb, GFP_ATOMIC);
781 if (unlikely(!nskb)) {
782 atomic_inc(&sk->sk_drops);
783 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
784 IS_UDPLITE(sk));
785 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
786 IS_UDPLITE(sk));
787 continue;
788 }
789
790 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
791 consume_skb(nskb);
792 }
793
794
795 if (use_hash2 && hash2 != hash2_any) {
796 hash2 = hash2_any;
797 goto start_lookup;
798 }
799
800 if (first) {
801 if (udpv6_queue_rcv_skb(first, skb) > 0)
802 consume_skb(skb);
803 } else {
804 kfree_skb(skb);
805 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
806 proto == IPPROTO_UDPLITE);
807 }
808 return 0;
809}
810
811static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
812{
813 if (udp_sk_rx_dst_set(sk, dst)) {
814 const struct rt6_info *rt = (const struct rt6_info *)dst;
815
816 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
817 }
818}
819
820
821
822
823static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
824 struct udphdr *uh)
825{
826 int ret;
827
828 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
829 skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo);
830
831 ret = udpv6_queue_rcv_skb(sk, skb);
832
833
834 if (ret > 0)
835 return ret;
836 return 0;
837}
838
839int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
840 int proto)
841{
842 const struct in6_addr *saddr, *daddr;
843 struct net *net = dev_net(skb->dev);
844 struct udphdr *uh;
845 struct sock *sk;
846 u32 ulen = 0;
847
848 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
849 goto discard;
850
851 saddr = &ipv6_hdr(skb)->saddr;
852 daddr = &ipv6_hdr(skb)->daddr;
853 uh = udp_hdr(skb);
854
855 ulen = ntohs(uh->len);
856 if (ulen > skb->len)
857 goto short_packet;
858
859 if (proto == IPPROTO_UDP) {
860
861
862
863 if (ulen == 0)
864 ulen = skb->len;
865
866 if (ulen < sizeof(*uh))
867 goto short_packet;
868
869 if (ulen < skb->len) {
870 if (pskb_trim_rcsum(skb, ulen))
871 goto short_packet;
872 saddr = &ipv6_hdr(skb)->saddr;
873 daddr = &ipv6_hdr(skb)->daddr;
874 uh = udp_hdr(skb);
875 }
876 }
877
878 if (udp6_csum_init(skb, uh, proto))
879 goto csum_error;
880
881
882 sk = skb_steal_sock(skb);
883 if (sk) {
884 struct dst_entry *dst = skb_dst(skb);
885 int ret;
886
887 if (unlikely(sk->sk_rx_dst != dst))
888 udp6_sk_rx_dst_set(sk, dst);
889
890 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
891 sock_put(sk);
892 goto report_csum_error;
893 }
894
895 ret = udp6_unicast_rcv_skb(sk, skb, uh);
896 sock_put(sk);
897 return ret;
898 }
899
900
901
902
903 if (ipv6_addr_is_multicast(daddr))
904 return __udp6_lib_mcast_deliver(net, skb,
905 saddr, daddr, udptable, proto);
906
907
908 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
909 if (sk) {
910 if (!uh->check && !udp_sk(sk)->no_check6_rx)
911 goto report_csum_error;
912 return udp6_unicast_rcv_skb(sk, skb, uh);
913 }
914
915 if (!uh->check)
916 goto report_csum_error;
917
918 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
919 goto discard;
920
921 if (udp_lib_checksum_complete(skb))
922 goto csum_error;
923
924 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
925 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
926
927 kfree_skb(skb);
928 return 0;
929
930short_packet:
931 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
932 proto == IPPROTO_UDPLITE ? "-Lite" : "",
933 saddr, ntohs(uh->source),
934 ulen, skb->len,
935 daddr, ntohs(uh->dest));
936 goto discard;
937
938report_csum_error:
939 udp6_csum_zero_error(skb);
940csum_error:
941 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
942discard:
943 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
944 kfree_skb(skb);
945 return 0;
946}
947
948
949static struct sock *__udp6_lib_demux_lookup(struct net *net,
950 __be16 loc_port, const struct in6_addr *loc_addr,
951 __be16 rmt_port, const struct in6_addr *rmt_addr,
952 int dif, int sdif)
953{
954 unsigned short hnum = ntohs(loc_port);
955 unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
956 unsigned int slot2 = hash2 & udp_table.mask;
957 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
958 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
959 struct sock *sk;
960
961 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
962 if (sk->sk_state == TCP_ESTABLISHED &&
963 INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif))
964 return sk;
965
966 break;
967 }
968 return NULL;
969}
970
971INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
972{
973 struct net *net = dev_net(skb->dev);
974 const struct udphdr *uh;
975 struct sock *sk;
976 struct dst_entry *dst;
977 int dif = skb->dev->ifindex;
978 int sdif = inet6_sdif(skb);
979
980 if (!pskb_may_pull(skb, skb_transport_offset(skb) +
981 sizeof(struct udphdr)))
982 return;
983
984 uh = udp_hdr(skb);
985
986 if (skb->pkt_type == PACKET_HOST)
987 sk = __udp6_lib_demux_lookup(net, uh->dest,
988 &ipv6_hdr(skb)->daddr,
989 uh->source, &ipv6_hdr(skb)->saddr,
990 dif, sdif);
991 else
992 return;
993
994 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
995 return;
996
997 skb->sk = sk;
998 skb->destructor = sock_efree;
999 dst = READ_ONCE(sk->sk_rx_dst);
1000
1001 if (dst)
1002 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1003 if (dst) {
1004
1005
1006
1007
1008 skb_dst_set_noref(skb, dst);
1009 }
1010}
1011
1012INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
1013{
1014 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1015}
1016
1017
1018
1019
1020static void udp_v6_flush_pending_frames(struct sock *sk)
1021{
1022 struct udp_sock *up = udp_sk(sk);
1023
1024 if (up->pending == AF_INET)
1025 udp_flush_pending_frames(sk);
1026 else if (up->pending) {
1027 up->len = 0;
1028 up->pending = 0;
1029 ip6_flush_pending_frames(sk);
1030 }
1031}
1032
1033static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
1034 int addr_len)
1035{
1036 if (addr_len < offsetofend(struct sockaddr, sa_family))
1037 return -EINVAL;
1038
1039
1040
1041
1042 if (uaddr->sa_family == AF_INET) {
1043 if (__ipv6_only_sock(sk))
1044 return -EAFNOSUPPORT;
1045 return udp_pre_connect(sk, uaddr, addr_len);
1046 }
1047
1048 if (addr_len < SIN6_LEN_RFC2133)
1049 return -EINVAL;
1050
1051 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
1052}
1053
1054
1055
1056
1057
1058
1059
1060static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
1061 const struct in6_addr *saddr,
1062 const struct in6_addr *daddr, int len)
1063{
1064 unsigned int offset;
1065 struct udphdr *uh = udp_hdr(skb);
1066 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
1067 __wsum csum = 0;
1068
1069 if (!frags) {
1070
1071 skb->csum_start = skb_transport_header(skb) - skb->head;
1072 skb->csum_offset = offsetof(struct udphdr, check);
1073 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
1074 } else {
1075
1076
1077
1078
1079
1080 offset = skb_transport_offset(skb);
1081 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
1082 csum = skb->csum;
1083
1084 skb->ip_summed = CHECKSUM_NONE;
1085
1086 do {
1087 csum = csum_add(csum, frags->csum);
1088 } while ((frags = frags->next));
1089
1090 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
1091 csum);
1092 if (uh->check == 0)
1093 uh->check = CSUM_MANGLED_0;
1094 }
1095}
1096
1097
1098
1099
1100
1101static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
1102 struct inet_cork *cork)
1103{
1104 struct sock *sk = skb->sk;
1105 struct udphdr *uh;
1106 int err = 0;
1107 int is_udplite = IS_UDPLITE(sk);
1108 __wsum csum = 0;
1109 int offset = skb_transport_offset(skb);
1110 int len = skb->len - offset;
1111
1112
1113
1114
1115 uh = udp_hdr(skb);
1116 uh->source = fl6->fl6_sport;
1117 uh->dest = fl6->fl6_dport;
1118 uh->len = htons(len);
1119 uh->check = 0;
1120
1121 if (cork->gso_size) {
1122 const int hlen = skb_network_header_len(skb) +
1123 sizeof(struct udphdr);
1124
1125 if (hlen + cork->gso_size > cork->fragsize) {
1126 kfree_skb(skb);
1127 return -EINVAL;
1128 }
1129 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
1130 kfree_skb(skb);
1131 return -EINVAL;
1132 }
1133 if (udp_sk(sk)->no_check6_tx) {
1134 kfree_skb(skb);
1135 return -EINVAL;
1136 }
1137 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
1138 dst_xfrm(skb_dst(skb))) {
1139 kfree_skb(skb);
1140 return -EIO;
1141 }
1142
1143 skb_shinfo(skb)->gso_size = cork->gso_size;
1144 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
1145 goto csum_partial;
1146 }
1147
1148 if (is_udplite)
1149 csum = udplite_csum(skb);
1150 else if (udp_sk(sk)->no_check6_tx) {
1151 skb->ip_summed = CHECKSUM_NONE;
1152 goto send;
1153 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1154csum_partial:
1155 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
1156 goto send;
1157 } else
1158 csum = udp_csum(skb);
1159
1160
1161 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1162 len, fl6->flowi6_proto, csum);
1163 if (uh->check == 0)
1164 uh->check = CSUM_MANGLED_0;
1165
1166send:
1167 err = ip6_send_skb(skb);
1168 if (err) {
1169 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1170 UDP6_INC_STATS(sock_net(sk),
1171 UDP_MIB_SNDBUFERRORS, is_udplite);
1172 err = 0;
1173 }
1174 } else {
1175 UDP6_INC_STATS(sock_net(sk),
1176 UDP_MIB_OUTDATAGRAMS, is_udplite);
1177 }
1178 return err;
1179}
1180
1181static int udp_v6_push_pending_frames(struct sock *sk)
1182{
1183 struct sk_buff *skb;
1184 struct udp_sock *up = udp_sk(sk);
1185 struct flowi6 fl6;
1186 int err = 0;
1187
1188 if (up->pending == AF_INET)
1189 return udp_push_pending_frames(sk);
1190
1191
1192
1193
1194 fl6 = inet_sk(sk)->cork.fl.u.ip6;
1195
1196 skb = ip6_finish_skb(sk);
1197 if (!skb)
1198 goto out;
1199
1200 err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base);
1201
1202out:
1203 up->len = 0;
1204 up->pending = 0;
1205 return err;
1206}
1207
1208int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1209{
1210 struct ipv6_txoptions opt_space;
1211 struct udp_sock *up = udp_sk(sk);
1212 struct inet_sock *inet = inet_sk(sk);
1213 struct ipv6_pinfo *np = inet6_sk(sk);
1214 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1215 struct in6_addr *daddr, *final_p, final;
1216 struct ipv6_txoptions *opt = NULL;
1217 struct ipv6_txoptions *opt_to_free = NULL;
1218 struct ip6_flowlabel *flowlabel = NULL;
1219 struct flowi6 fl6;
1220 struct dst_entry *dst;
1221 struct ipcm6_cookie ipc6;
1222 int addr_len = msg->msg_namelen;
1223 bool connected = false;
1224 int ulen = len;
1225 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1226 int err;
1227 int is_udplite = IS_UDPLITE(sk);
1228 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1229
1230 ipcm6_init(&ipc6);
1231 ipc6.gso_size = up->gso_size;
1232 ipc6.sockc.tsflags = sk->sk_tsflags;
1233
1234
1235 if (sin6) {
1236 if (addr_len < offsetof(struct sockaddr, sa_data))
1237 return -EINVAL;
1238
1239 switch (sin6->sin6_family) {
1240 case AF_INET6:
1241 if (addr_len < SIN6_LEN_RFC2133)
1242 return -EINVAL;
1243 daddr = &sin6->sin6_addr;
1244 if (ipv6_addr_any(daddr) &&
1245 ipv6_addr_v4mapped(&np->saddr))
1246 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
1247 daddr);
1248 break;
1249 case AF_INET:
1250 goto do_udp_sendmsg;
1251 case AF_UNSPEC:
1252 msg->msg_name = sin6 = NULL;
1253 msg->msg_namelen = addr_len = 0;
1254 daddr = NULL;
1255 break;
1256 default:
1257 return -EINVAL;
1258 }
1259 } else if (!up->pending) {
1260 if (sk->sk_state != TCP_ESTABLISHED)
1261 return -EDESTADDRREQ;
1262 daddr = &sk->sk_v6_daddr;
1263 } else
1264 daddr = NULL;
1265
1266 if (daddr) {
1267 if (ipv6_addr_v4mapped(daddr)) {
1268 struct sockaddr_in sin;
1269 sin.sin_family = AF_INET;
1270 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1271 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1272 msg->msg_name = &sin;
1273 msg->msg_namelen = sizeof(sin);
1274do_udp_sendmsg:
1275 if (__ipv6_only_sock(sk))
1276 return -ENETUNREACH;
1277 return udp_sendmsg(sk, msg, len);
1278 }
1279 }
1280
1281 if (up->pending == AF_INET)
1282 return udp_sendmsg(sk, msg, len);
1283
1284
1285
1286
1287 if (len > INT_MAX - sizeof(struct udphdr))
1288 return -EMSGSIZE;
1289
1290 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1291 if (up->pending) {
1292
1293
1294
1295
1296 lock_sock(sk);
1297 if (likely(up->pending)) {
1298 if (unlikely(up->pending != AF_INET6)) {
1299 release_sock(sk);
1300 return -EAFNOSUPPORT;
1301 }
1302 dst = NULL;
1303 goto do_append_data;
1304 }
1305 release_sock(sk);
1306 }
1307 ulen += sizeof(struct udphdr);
1308
1309 memset(&fl6, 0, sizeof(fl6));
1310
1311 if (sin6) {
1312 if (sin6->sin6_port == 0)
1313 return -EINVAL;
1314
1315 fl6.fl6_dport = sin6->sin6_port;
1316 daddr = &sin6->sin6_addr;
1317
1318 if (np->sndflow) {
1319 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1320 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1321 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1322 if (IS_ERR(flowlabel))
1323 return -EINVAL;
1324 }
1325 }
1326
1327
1328
1329
1330
1331 if (sk->sk_state == TCP_ESTABLISHED &&
1332 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1333 daddr = &sk->sk_v6_daddr;
1334
1335 if (addr_len >= sizeof(struct sockaddr_in6) &&
1336 sin6->sin6_scope_id &&
1337 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1338 fl6.flowi6_oif = sin6->sin6_scope_id;
1339 } else {
1340 if (sk->sk_state != TCP_ESTABLISHED)
1341 return -EDESTADDRREQ;
1342
1343 fl6.fl6_dport = inet->inet_dport;
1344 daddr = &sk->sk_v6_daddr;
1345 fl6.flowlabel = np->flow_label;
1346 connected = true;
1347 }
1348
1349 if (!fl6.flowi6_oif)
1350 fl6.flowi6_oif = sk->sk_bound_dev_if;
1351
1352 if (!fl6.flowi6_oif)
1353 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1354
1355 fl6.flowi6_mark = sk->sk_mark;
1356 fl6.flowi6_uid = sk->sk_uid;
1357
1358 if (msg->msg_controllen) {
1359 opt = &opt_space;
1360 memset(opt, 0, sizeof(struct ipv6_txoptions));
1361 opt->tot_len = sizeof(*opt);
1362 ipc6.opt = opt;
1363
1364 err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
1365 if (err > 0)
1366 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
1367 &ipc6);
1368 if (err < 0) {
1369 fl6_sock_release(flowlabel);
1370 return err;
1371 }
1372 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1373 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1374 if (IS_ERR(flowlabel))
1375 return -EINVAL;
1376 }
1377 if (!(opt->opt_nflen|opt->opt_flen))
1378 opt = NULL;
1379 connected = false;
1380 }
1381 if (!opt) {
1382 opt = txopt_get(np);
1383 opt_to_free = opt;
1384 }
1385 if (flowlabel)
1386 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1387 opt = ipv6_fixup_options(&opt_space, opt);
1388 ipc6.opt = opt;
1389
1390 fl6.flowi6_proto = sk->sk_protocol;
1391 fl6.daddr = *daddr;
1392 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1393 fl6.saddr = np->saddr;
1394 fl6.fl6_sport = inet->inet_sport;
1395
1396 if (cgroup_bpf_enabled && !connected) {
1397 err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk,
1398 (struct sockaddr *)sin6, &fl6.saddr);
1399 if (err)
1400 goto out_no_dst;
1401 if (sin6) {
1402 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
1403
1404
1405
1406 err = -ENOTSUPP;
1407 goto out_no_dst;
1408 }
1409 if (sin6->sin6_port == 0) {
1410
1411 err = -EINVAL;
1412 goto out_no_dst;
1413 }
1414 fl6.fl6_dport = sin6->sin6_port;
1415 fl6.daddr = sin6->sin6_addr;
1416 }
1417 }
1418
1419 if (ipv6_addr_any(&fl6.daddr))
1420 fl6.daddr.s6_addr[15] = 0x1;
1421
1422 final_p = fl6_update_dst(&fl6, opt, &final);
1423 if (final_p)
1424 connected = false;
1425
1426 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1427 fl6.flowi6_oif = np->mcast_oif;
1428 connected = false;
1429 } else if (!fl6.flowi6_oif)
1430 fl6.flowi6_oif = np->ucast_oif;
1431
1432 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1433
1434 if (ipc6.tclass < 0)
1435 ipc6.tclass = np->tclass;
1436
1437 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1438
1439 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
1440 if (IS_ERR(dst)) {
1441 err = PTR_ERR(dst);
1442 dst = NULL;
1443 goto out;
1444 }
1445
1446 if (ipc6.hlimit < 0)
1447 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1448
1449 if (msg->msg_flags&MSG_CONFIRM)
1450 goto do_confirm;
1451back_from_confirm:
1452
1453
1454 if (!corkreq) {
1455 struct inet_cork_full cork;
1456 struct sk_buff *skb;
1457
1458 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1459 sizeof(struct udphdr), &ipc6,
1460 &fl6, (struct rt6_info *)dst,
1461 msg->msg_flags, &cork);
1462 err = PTR_ERR(skb);
1463 if (!IS_ERR_OR_NULL(skb))
1464 err = udp_v6_send_skb(skb, &fl6, &cork.base);
1465 goto out;
1466 }
1467
1468 lock_sock(sk);
1469 if (unlikely(up->pending)) {
1470
1471
1472 release_sock(sk);
1473
1474 net_dbg_ratelimited("udp cork app bug 2\n");
1475 err = -EINVAL;
1476 goto out;
1477 }
1478
1479 up->pending = AF_INET6;
1480
1481do_append_data:
1482 if (ipc6.dontfrag < 0)
1483 ipc6.dontfrag = np->dontfrag;
1484 up->len += ulen;
1485 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1486 &ipc6, &fl6, (struct rt6_info *)dst,
1487 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1488 if (err)
1489 udp_v6_flush_pending_frames(sk);
1490 else if (!corkreq)
1491 err = udp_v6_push_pending_frames(sk);
1492 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1493 up->pending = 0;
1494
1495 if (err > 0)
1496 err = np->recverr ? net_xmit_errno(err) : 0;
1497 release_sock(sk);
1498
1499out:
1500 dst_release(dst);
1501out_no_dst:
1502 fl6_sock_release(flowlabel);
1503 txopt_put(opt_to_free);
1504 if (!err)
1505 return len;
1506
1507
1508
1509
1510
1511
1512
1513 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1514 UDP6_INC_STATS(sock_net(sk),
1515 UDP_MIB_SNDBUFERRORS, is_udplite);
1516 }
1517 return err;
1518
1519do_confirm:
1520 if (msg->msg_flags & MSG_PROBE)
1521 dst_confirm_neigh(dst, &fl6.daddr);
1522 if (!(msg->msg_flags&MSG_PROBE) || len)
1523 goto back_from_confirm;
1524 err = 0;
1525 goto out;
1526}
1527
1528void udpv6_destroy_sock(struct sock *sk)
1529{
1530 struct udp_sock *up = udp_sk(sk);
1531 lock_sock(sk);
1532 udp_v6_flush_pending_frames(sk);
1533 release_sock(sk);
1534
1535 if (static_branch_unlikely(&udpv6_encap_needed_key)) {
1536 if (up->encap_type) {
1537 void (*encap_destroy)(struct sock *sk);
1538 encap_destroy = READ_ONCE(up->encap_destroy);
1539 if (encap_destroy)
1540 encap_destroy(sk);
1541 }
1542 if (up->encap_enabled)
1543 static_branch_dec(&udpv6_encap_needed_key);
1544 }
1545
1546 inet6_destroy_sock(sk);
1547}
1548
1549
1550
1551
1552int udpv6_setsockopt(struct sock *sk, int level, int optname,
1553 char __user *optval, unsigned int optlen)
1554{
1555 if (level == SOL_UDP || level == SOL_UDPLITE)
1556 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1557 udp_v6_push_pending_frames);
1558 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1559}
1560
1561#ifdef CONFIG_COMPAT
1562int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1563 char __user *optval, unsigned int optlen)
1564{
1565 if (level == SOL_UDP || level == SOL_UDPLITE)
1566 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1567 udp_v6_push_pending_frames);
1568 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1569}
1570#endif
1571
1572int udpv6_getsockopt(struct sock *sk, int level, int optname,
1573 char __user *optval, int __user *optlen)
1574{
1575 if (level == SOL_UDP || level == SOL_UDPLITE)
1576 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1577 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1578}
1579
1580#ifdef CONFIG_COMPAT
1581int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1582 char __user *optval, int __user *optlen)
1583{
1584 if (level == SOL_UDP || level == SOL_UDPLITE)
1585 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1586 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1587}
1588#endif
1589
1590
1591
1592
1593static struct inet6_protocol udpv6_protocol = {
1594 .early_demux = udp_v6_early_demux,
1595 .early_demux_handler = udp_v6_early_demux,
1596 .handler = udpv6_rcv,
1597 .err_handler = udpv6_err,
1598 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1599};
1600
1601
1602#ifdef CONFIG_PROC_FS
1603int udp6_seq_show(struct seq_file *seq, void *v)
1604{
1605 if (v == SEQ_START_TOKEN) {
1606 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1607 } else {
1608 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1609 struct inet_sock *inet = inet_sk(v);
1610 __u16 srcp = ntohs(inet->inet_sport);
1611 __u16 destp = ntohs(inet->inet_dport);
1612 __ip6_dgram_sock_seq_show(seq, v, srcp, destp,
1613 udp_rqueue_get(v), bucket);
1614 }
1615 return 0;
1616}
1617
1618const struct seq_operations udp6_seq_ops = {
1619 .start = udp_seq_start,
1620 .next = udp_seq_next,
1621 .stop = udp_seq_stop,
1622 .show = udp6_seq_show,
1623};
1624EXPORT_SYMBOL(udp6_seq_ops);
1625
1626static struct udp_seq_afinfo udp6_seq_afinfo = {
1627 .family = AF_INET6,
1628 .udp_table = &udp_table,
1629};
1630
1631int __net_init udp6_proc_init(struct net *net)
1632{
1633 if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops,
1634 sizeof(struct udp_iter_state), &udp6_seq_afinfo))
1635 return -ENOMEM;
1636 return 0;
1637}
1638
1639void udp6_proc_exit(struct net *net)
1640{
1641 remove_proc_entry("udp6", net->proc_net);
1642}
1643#endif
1644
1645
1646
1647struct proto udpv6_prot = {
1648 .name = "UDPv6",
1649 .owner = THIS_MODULE,
1650 .close = udp_lib_close,
1651 .pre_connect = udpv6_pre_connect,
1652 .connect = ip6_datagram_connect,
1653 .disconnect = udp_disconnect,
1654 .ioctl = udp_ioctl,
1655 .init = udp_init_sock,
1656 .destroy = udpv6_destroy_sock,
1657 .setsockopt = udpv6_setsockopt,
1658 .getsockopt = udpv6_getsockopt,
1659 .sendmsg = udpv6_sendmsg,
1660 .recvmsg = udpv6_recvmsg,
1661 .release_cb = ip6_datagram_release_cb,
1662 .hash = udp_lib_hash,
1663 .unhash = udp_lib_unhash,
1664 .rehash = udp_v6_rehash,
1665 .get_port = udp_v6_get_port,
1666 .memory_allocated = &udp_memory_allocated,
1667 .sysctl_mem = sysctl_udp_mem,
1668 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
1669 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
1670 .obj_size = sizeof(struct udp6_sock),
1671 .h.udp_table = &udp_table,
1672#ifdef CONFIG_COMPAT
1673 .compat_setsockopt = compat_udpv6_setsockopt,
1674 .compat_getsockopt = compat_udpv6_getsockopt,
1675#endif
1676 .diag_destroy = udp_abort,
1677};
1678
1679static struct inet_protosw udpv6_protosw = {
1680 .type = SOCK_DGRAM,
1681 .protocol = IPPROTO_UDP,
1682 .prot = &udpv6_prot,
1683 .ops = &inet6_dgram_ops,
1684 .flags = INET_PROTOSW_PERMANENT,
1685};
1686
1687int __init udpv6_init(void)
1688{
1689 int ret;
1690
1691 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1692 if (ret)
1693 goto out;
1694
1695 ret = inet6_register_protosw(&udpv6_protosw);
1696 if (ret)
1697 goto out_udpv6_protocol;
1698out:
1699 return ret;
1700
1701out_udpv6_protocol:
1702 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1703 goto out;
1704}
1705
1706void udpv6_exit(void)
1707{
1708 inet6_unregister_protosw(&udpv6_protosw);
1709 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1710}
1711
