]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/ipv6/udp.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


b5a23ce8981dfec4199f19896c41c384dd577a4b
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/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
58 static 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
81 static 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
97 int 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
109 static 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
118 static int compute_score(struct sock *sk, struct net *net,
119 const struct in6_addr *saddr, __be16 sport,
120 const struct in6_addr *daddr, unsigned short hnum,
121 int dif)
122 {
123 int score;
124 struct inet_sock *inet;
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 score = 0;
132 inet = inet_sk(sk);
133
134 if (inet->inet_dport) {
135 if (inet->inet_dport != sport)
136 return -1;
137 score++;
138 }
139
140 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
141 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
142 return -1;
143 score++;
144 }
145
146 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
147 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
148 return -1;
149 score++;
150 }
151
152 if (sk->sk_bound_dev_if) {
153 if (sk->sk_bound_dev_if != dif)
154 return -1;
155 score++;
156 }
157
158 if (sk->sk_incoming_cpu == raw_smp_processor_id())
159 score++;
160
161 return score;
162 }
163
164 /* called with rcu_read_lock() */
165 static struct sock *udp6_lib_lookup2(struct net *net,
166 const struct in6_addr *saddr, __be16 sport,
167 const struct in6_addr *daddr, unsigned int hnum, int dif,
168 struct udp_hslot *hslot2,
169 struct sk_buff *skb)
170 {
171 struct sock *sk, *result;
172 int score, badness, matches = 0, reuseport = 0;
173 u32 hash = 0;
174
175 result = NULL;
176 badness = -1;
177 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
178 score = compute_score(sk, net, saddr, sport,
179 daddr, hnum, dif);
180 if (score > badness) {
181 reuseport = sk->sk_reuseport;
182 if (reuseport) {
183 hash = udp6_ehashfn(net, daddr, hnum,
184 saddr, sport);
185
186 result = reuseport_select_sock(sk, hash, skb,
187 sizeof(struct udphdr));
188 if (result)
189 return result;
190 matches = 1;
191 }
192 result = sk;
193 badness = score;
194 } else if (score == badness && reuseport) {
195 matches++;
196 if (reciprocal_scale(hash, matches) == 0)
197 result = sk;
198 hash = next_pseudo_random32(hash);
199 }
200 }
201 return result;
202 }
203
204 /* rcu_read_lock() must be held */
205 struct sock *__udp6_lib_lookup(struct net *net,
206 const struct in6_addr *saddr, __be16 sport,
207 const struct in6_addr *daddr, __be16 dport,
208 int dif, struct udp_table *udptable,
209 struct sk_buff *skb)
210 {
211 struct sock *sk, *result;
212 unsigned short hnum = ntohs(dport);
213 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
214 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
215 int score, badness, matches = 0, reuseport = 0;
216 u32 hash = 0;
217
218 if (hslot->count > 10) {
219 hash2 = udp6_portaddr_hash(net, daddr, hnum);
220 slot2 = hash2 & udptable->mask;
221 hslot2 = &udptable->hash2[slot2];
222 if (hslot->count < hslot2->count)
223 goto begin;
224
225 result = udp6_lib_lookup2(net, saddr, sport,
226 daddr, hnum, dif,
227 hslot2, skb);
228 if (!result) {
229 unsigned int old_slot2 = slot2;
230 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
231 slot2 = hash2 & udptable->mask;
232 /* avoid searching the same slot again. */
233 if (unlikely(slot2 == old_slot2))
234 return result;
235
236 hslot2 = &udptable->hash2[slot2];
237 if (hslot->count < hslot2->count)
238 goto begin;
239
240 result = udp6_lib_lookup2(net, saddr, sport,
241 daddr, hnum, dif,
242 hslot2, skb);
243 }
244 return result;
245 }
246 begin:
247 result = NULL;
248 badness = -1;
249 sk_for_each_rcu(sk, &hslot->head) {
250 score = compute_score(sk, net, saddr, sport, daddr, hnum, dif);
251 if (score > badness) {
252 reuseport = sk->sk_reuseport;
253 if (reuseport) {
254 hash = udp6_ehashfn(net, daddr, hnum,
255 saddr, sport);
256 result = reuseport_select_sock(sk, hash, skb,
257 sizeof(struct udphdr));
258 if (result)
259 return result;
260 matches = 1;
261 }
262 result = sk;
263 badness = score;
264 } else if (score == badness && reuseport) {
265 matches++;
266 if (reciprocal_scale(hash, matches) == 0)
267 result = sk;
268 hash = next_pseudo_random32(hash);
269 }
270 }
271 return result;
272 }
273 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
274
275 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
276 __be16 sport, __be16 dport,
277 struct udp_table *udptable)
278 {
279 const struct ipv6hdr *iph = ipv6_hdr(skb);
280 struct sock *sk;
281
282 sk = skb_steal_sock(skb);
283 if (unlikely(sk))
284 return sk;
285 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
286 &iph->daddr, dport, inet6_iif(skb),
287 udptable, skb);
288 }
289
290 struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
291 __be16 sport, __be16 dport)
292 {
293 const struct ipv6hdr *iph = ipv6_hdr(skb);
294
295 return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport,
296 &iph->daddr, dport, inet6_iif(skb),
297 &udp_table, skb);
298 }
299 EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb);
300
301 /* Must be called under rcu_read_lock().
302 * Does increment socket refcount.
303 */
304 #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
305 IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
306 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
307 const struct in6_addr *daddr, __be16 dport, int dif)
308 {
309 struct sock *sk;
310
311 sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
312 dif, &udp_table, NULL);
313 if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
314 sk = NULL;
315 return sk;
316 }
317 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
318 #endif
319
320 /*
321 * This should be easy, if there is something there we
322 * return it, otherwise we block.
323 */
324
325 int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
326 int noblock, int flags, int *addr_len)
327 {
328 struct ipv6_pinfo *np = inet6_sk(sk);
329 struct inet_sock *inet = inet_sk(sk);
330 struct sk_buff *skb;
331 unsigned int ulen, copied;
332 int peeked, peeking, off;
333 int err;
334 int is_udplite = IS_UDPLITE(sk);
335 bool checksum_valid = false;
336 int is_udp4;
337
338 if (flags & MSG_ERRQUEUE)
339 return ipv6_recv_error(sk, msg, len, addr_len);
340
341 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
342 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
343
344 try_again:
345 peeking = off = sk_peek_offset(sk, flags);
346 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
347 &peeked, &off, &err);
348 if (!skb)
349 return err;
350
351 ulen = skb->len;
352 copied = len;
353 if (copied > ulen - off)
354 copied = ulen - off;
355 else if (copied < ulen)
356 msg->msg_flags |= MSG_TRUNC;
357
358 is_udp4 = (skb->protocol == htons(ETH_P_IP));
359
360 /*
361 * If checksum is needed at all, try to do it while copying the
362 * data. If the data is truncated, or if we only want a partial
363 * coverage checksum (UDP-Lite), do it before the copy.
364 */
365
366 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) {
367 checksum_valid = !udp_lib_checksum_complete(skb);
368 if (!checksum_valid)
369 goto csum_copy_err;
370 }
371
372 if (checksum_valid || skb_csum_unnecessary(skb))
373 err = skb_copy_datagram_msg(skb, off, msg, copied);
374 else {
375 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
376 if (err == -EINVAL)
377 goto csum_copy_err;
378 }
379 if (unlikely(err)) {
380 if (!peeked) {
381 atomic_inc(&sk->sk_drops);
382 if (is_udp4)
383 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
384 is_udplite);
385 else
386 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
387 is_udplite);
388 }
389 kfree_skb(skb);
390 return err;
391 }
392 if (!peeked) {
393 if (is_udp4)
394 UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
395 is_udplite);
396 else
397 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS,
398 is_udplite);
399 }
400
401 sock_recv_ts_and_drops(msg, sk, skb);
402
403 /* Copy the address. */
404 if (msg->msg_name) {
405 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
406 sin6->sin6_family = AF_INET6;
407 sin6->sin6_port = udp_hdr(skb)->source;
408 sin6->sin6_flowinfo = 0;
409
410 if (is_udp4) {
411 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
412 &sin6->sin6_addr);
413 sin6->sin6_scope_id = 0;
414 } else {
415 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
416 sin6->sin6_scope_id =
417 ipv6_iface_scope_id(&sin6->sin6_addr,
418 inet6_iif(skb));
419 }
420 *addr_len = sizeof(*sin6);
421 }
422
423 if (np->rxopt.all)
424 ip6_datagram_recv_common_ctl(sk, msg, skb);
425
426 if (is_udp4) {
427 if (inet->cmsg_flags)
428 ip_cmsg_recv_offset(msg, sk, skb,
429 sizeof(struct udphdr), off);
430 } else {
431 if (np->rxopt.all)
432 ip6_datagram_recv_specific_ctl(sk, msg, skb);
433 }
434
435 err = copied;
436 if (flags & MSG_TRUNC)
437 err = ulen;
438
439 skb_consume_udp(sk, skb, peeking ? -err : err);
440 return err;
441
442 csum_copy_err:
443 if (!__sk_queue_drop_skb(sk, skb, flags)) {
444 if (is_udp4) {
445 UDP_INC_STATS(sock_net(sk),
446 UDP_MIB_CSUMERRORS, is_udplite);
447 UDP_INC_STATS(sock_net(sk),
448 UDP_MIB_INERRORS, is_udplite);
449 } else {
450 UDP6_INC_STATS(sock_net(sk),
451 UDP_MIB_CSUMERRORS, is_udplite);
452 UDP6_INC_STATS(sock_net(sk),
453 UDP_MIB_INERRORS, is_udplite);
454 }
455 }
456 kfree_skb(skb);
457
458 /* starting over for a new packet, but check if we need to yield */
459 cond_resched();
460 msg->msg_flags &= ~MSG_TRUNC;
461 goto try_again;
462 }
463
464 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
465 u8 type, u8 code, int offset, __be32 info,
466 struct udp_table *udptable)
467 {
468 struct ipv6_pinfo *np;
469 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
470 const struct in6_addr *saddr = &hdr->saddr;
471 const struct in6_addr *daddr = &hdr->daddr;
472 struct udphdr *uh = (struct udphdr *)(skb->data+offset);
473 struct sock *sk;
474 int harderr;
475 int err;
476 struct net *net = dev_net(skb->dev);
477
478 sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
479 inet6_iif(skb), udptable, skb);
480 if (!sk) {
481 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
482 ICMP6_MIB_INERRORS);
483 return;
484 }
485
486 harderr = icmpv6_err_convert(type, code, &err);
487 np = inet6_sk(sk);
488
489 if (type == ICMPV6_PKT_TOOBIG) {
490 if (!ip6_sk_accept_pmtu(sk))
491 goto out;
492 ip6_sk_update_pmtu(skb, sk, info);
493 if (np->pmtudisc != IPV6_PMTUDISC_DONT)
494 harderr = 1;
495 }
496 if (type == NDISC_REDIRECT) {
497 ip6_sk_redirect(skb, sk);
498 goto out;
499 }
500
501 if (!np->recverr) {
502 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
503 goto out;
504 } else {
505 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
506 }
507
508 sk->sk_err = err;
509 sk->sk_error_report(sk);
510 out:
511 return;
512 }
513
514 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
515 {
516 int rc;
517
518 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
519 sock_rps_save_rxhash(sk, skb);
520 sk_mark_napi_id(sk, skb);
521 sk_incoming_cpu_update(sk);
522 }
523
524 rc = __udp_enqueue_schedule_skb(sk, skb);
525 if (rc < 0) {
526 int is_udplite = IS_UDPLITE(sk);
527
528 /* Note that an ENOMEM error is charged twice */
529 if (rc == -ENOMEM)
530 UDP6_INC_STATS(sock_net(sk),
531 UDP_MIB_RCVBUFERRORS, is_udplite);
532 UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
533 kfree_skb(skb);
534 return -1;
535 }
536
537 return 0;
538 }
539
540 static __inline__ void udpv6_err(struct sk_buff *skb,
541 struct inet6_skb_parm *opt, u8 type,
542 u8 code, int offset, __be32 info)
543 {
544 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
545 }
546
547 static struct static_key udpv6_encap_needed __read_mostly;
548 void udpv6_encap_enable(void)
549 {
550 if (!static_key_enabled(&udpv6_encap_needed))
551 static_key_slow_inc(&udpv6_encap_needed);
552 }
553 EXPORT_SYMBOL(udpv6_encap_enable);
554
555 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
556 {
557 struct udp_sock *up = udp_sk(sk);
558 int is_udplite = IS_UDPLITE(sk);
559
560 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
561 goto drop;
562
563 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
564 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
565
566 /*
567 * This is an encapsulation socket so pass the skb to
568 * the socket's udp_encap_rcv() hook. Otherwise, just
569 * fall through and pass this up the UDP socket.
570 * up->encap_rcv() returns the following value:
571 * =0 if skb was successfully passed to the encap
572 * handler or was discarded by it.
573 * >0 if skb should be passed on to UDP.
574 * <0 if skb should be resubmitted as proto -N
575 */
576
577 /* if we're overly short, let UDP handle it */
578 encap_rcv = ACCESS_ONCE(up->encap_rcv);
579 if (encap_rcv) {
580 int ret;
581
582 /* Verify checksum before giving to encap */
583 if (udp_lib_checksum_complete(skb))
584 goto csum_error;
585
586 ret = encap_rcv(sk, skb);
587 if (ret <= 0) {
588 __UDP_INC_STATS(sock_net(sk),
589 UDP_MIB_INDATAGRAMS,
590 is_udplite);
591 return -ret;
592 }
593 }
594
595 /* FALLTHROUGH -- it's a UDP Packet */
596 }
597
598 /*
599 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
600 */
601 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
602
603 if (up->pcrlen == 0) { /* full coverage was set */
604 net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
605 UDP_SKB_CB(skb)->cscov, skb->len);
606 goto drop;
607 }
608 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
609 net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
610 UDP_SKB_CB(skb)->cscov, up->pcrlen);
611 goto drop;
612 }
613 }
614
615 if (rcu_access_pointer(sk->sk_filter) &&
616 udp_lib_checksum_complete(skb))
617 goto csum_error;
618
619 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
620 goto drop;
621
622 udp_csum_pull_header(skb);
623
624 skb_dst_drop(skb);
625
626 return __udpv6_queue_rcv_skb(sk, skb);
627
628 csum_error:
629 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
630 drop:
631 __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
632 atomic_inc(&sk->sk_drops);
633 kfree_skb(skb);
634 return -1;
635 }
636
637 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
638 __be16 loc_port, const struct in6_addr *loc_addr,
639 __be16 rmt_port, const struct in6_addr *rmt_addr,
640 int dif, unsigned short hnum)
641 {
642 struct inet_sock *inet = inet_sk(sk);
643
644 if (!net_eq(sock_net(sk), net))
645 return false;
646
647 if (udp_sk(sk)->udp_port_hash != hnum ||
648 sk->sk_family != PF_INET6 ||
649 (inet->inet_dport && inet->inet_dport != rmt_port) ||
650 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
651 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
652 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
653 (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
654 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
655 return false;
656 if (!inet6_mc_check(sk, loc_addr, rmt_addr))
657 return false;
658 return true;
659 }
660
661 static void udp6_csum_zero_error(struct sk_buff *skb)
662 {
663 /* RFC 2460 section 8.1 says that we SHOULD log
664 * this error. Well, it is reasonable.
665 */
666 net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
667 &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
668 &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
669 }
670
671 /*
672 * Note: called only from the BH handler context,
673 * so we don't need to lock the hashes.
674 */
675 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
676 const struct in6_addr *saddr, const struct in6_addr *daddr,
677 struct udp_table *udptable, int proto)
678 {
679 struct sock *sk, *first = NULL;
680 const struct udphdr *uh = udp_hdr(skb);
681 unsigned short hnum = ntohs(uh->dest);
682 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
683 unsigned int offset = offsetof(typeof(*sk), sk_node);
684 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
685 int dif = inet6_iif(skb);
686 struct hlist_node *node;
687 struct sk_buff *nskb;
688
689 if (use_hash2) {
690 hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
691 udp_table.mask;
692 hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
693 start_lookup:
694 hslot = &udp_table.hash2[hash2];
695 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
696 }
697
698 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
699 if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
700 uh->source, saddr, dif, hnum))
701 continue;
702 /* If zero checksum and no_check is not on for
703 * the socket then skip it.
704 */
705 if (!uh->check && !udp_sk(sk)->no_check6_rx)
706 continue;
707 if (!first) {
708 first = sk;
709 continue;
710 }
711 nskb = skb_clone(skb, GFP_ATOMIC);
712 if (unlikely(!nskb)) {
713 atomic_inc(&sk->sk_drops);
714 __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
715 IS_UDPLITE(sk));
716 __UDP6_INC_STATS(net, UDP_MIB_INERRORS,
717 IS_UDPLITE(sk));
718 continue;
719 }
720
721 if (udpv6_queue_rcv_skb(sk, nskb) > 0)
722 consume_skb(nskb);
723 }
724
725 /* Also lookup *:port if we are using hash2 and haven't done so yet. */
726 if (use_hash2 && hash2 != hash2_any) {
727 hash2 = hash2_any;
728 goto start_lookup;
729 }
730
731 if (first) {
732 if (udpv6_queue_rcv_skb(first, skb) > 0)
733 consume_skb(skb);
734 } else {
735 kfree_skb(skb);
736 __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
737 proto == IPPROTO_UDPLITE);
738 }
739 return 0;
740 }
741
742 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
743 int proto)
744 {
745 const struct in6_addr *saddr, *daddr;
746 struct net *net = dev_net(skb->dev);
747 struct udphdr *uh;
748 struct sock *sk;
749 u32 ulen = 0;
750
751 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
752 goto discard;
753
754 saddr = &ipv6_hdr(skb)->saddr;
755 daddr = &ipv6_hdr(skb)->daddr;
756 uh = udp_hdr(skb);
757
758 ulen = ntohs(uh->len);
759 if (ulen > skb->len)
760 goto short_packet;
761
762 if (proto == IPPROTO_UDP) {
763 /* UDP validates ulen. */
764
765 /* Check for jumbo payload */
766 if (ulen == 0)
767 ulen = skb->len;
768
769 if (ulen < sizeof(*uh))
770 goto short_packet;
771
772 if (ulen < skb->len) {
773 if (pskb_trim_rcsum(skb, ulen))
774 goto short_packet;
775 saddr = &ipv6_hdr(skb)->saddr;
776 daddr = &ipv6_hdr(skb)->daddr;
777 uh = udp_hdr(skb);
778 }
779 }
780
781 if (udp6_csum_init(skb, uh, proto))
782 goto csum_error;
783
784 /*
785 * Multicast receive code
786 */
787 if (ipv6_addr_is_multicast(daddr))
788 return __udp6_lib_mcast_deliver(net, skb,
789 saddr, daddr, udptable, proto);
790
791 /* Unicast */
792
793 /*
794 * check socket cache ... must talk to Alan about his plans
795 * for sock caches... i'll skip this for now.
796 */
797 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
798 if (sk) {
799 int ret;
800
801 if (!uh->check && !udp_sk(sk)->no_check6_rx) {
802 udp6_csum_zero_error(skb);
803 goto csum_error;
804 }
805
806 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
807 skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
808 ip6_compute_pseudo);
809
810 ret = udpv6_queue_rcv_skb(sk, skb);
811
812 /* a return value > 0 means to resubmit the input */
813 if (ret > 0)
814 return ret;
815
816 return 0;
817 }
818
819 if (!uh->check) {
820 udp6_csum_zero_error(skb);
821 goto csum_error;
822 }
823
824 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
825 goto discard;
826
827 if (udp_lib_checksum_complete(skb))
828 goto csum_error;
829
830 __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
831 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
832
833 kfree_skb(skb);
834 return 0;
835
836 short_packet:
837 net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
838 proto == IPPROTO_UDPLITE ? "-Lite" : "",
839 saddr, ntohs(uh->source),
840 ulen, skb->len,
841 daddr, ntohs(uh->dest));
842 goto discard;
843 csum_error:
844 __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
845 discard:
846 __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
847 kfree_skb(skb);
848 return 0;
849 }
850
851 static __inline__ int udpv6_rcv(struct sk_buff *skb)
852 {
853 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
854 }
855
856 /*
857 * Throw away all pending data and cancel the corking. Socket is locked.
858 */
859 static void udp_v6_flush_pending_frames(struct sock *sk)
860 {
861 struct udp_sock *up = udp_sk(sk);
862
863 if (up->pending == AF_INET)
864 udp_flush_pending_frames(sk);
865 else if (up->pending) {
866 up->len = 0;
867 up->pending = 0;
868 ip6_flush_pending_frames(sk);
869 }
870 }
871
872 /**
873 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
874 * @sk: socket we are sending on
875 * @skb: sk_buff containing the filled-in UDP header
876 * (checksum field must be zeroed out)
877 */
878 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
879 const struct in6_addr *saddr,
880 const struct in6_addr *daddr, int len)
881 {
882 unsigned int offset;
883 struct udphdr *uh = udp_hdr(skb);
884 struct sk_buff *frags = skb_shinfo(skb)->frag_list;
885 __wsum csum = 0;
886
887 if (!frags) {
888 /* Only one fragment on the socket. */
889 skb->csum_start = skb_transport_header(skb) - skb->head;
890 skb->csum_offset = offsetof(struct udphdr, check);
891 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
892 } else {
893 /*
894 * HW-checksum won't work as there are two or more
895 * fragments on the socket so that all csums of sk_buffs
896 * should be together
897 */
898 offset = skb_transport_offset(skb);
899 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
900
901 skb->ip_summed = CHECKSUM_NONE;
902
903 do {
904 csum = csum_add(csum, frags->csum);
905 } while ((frags = frags->next));
906
907 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
908 csum);
909 if (uh->check == 0)
910 uh->check = CSUM_MANGLED_0;
911 }
912 }
913
914 /*
915 * Sending
916 */
917
918 static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
919 {
920 struct sock *sk = skb->sk;
921 struct udphdr *uh;
922 int err = 0;
923 int is_udplite = IS_UDPLITE(sk);
924 __wsum csum = 0;
925 int offset = skb_transport_offset(skb);
926 int len = skb->len - offset;
927
928 /*
929 * Create a UDP header
930 */
931 uh = udp_hdr(skb);
932 uh->source = fl6->fl6_sport;
933 uh->dest = fl6->fl6_dport;
934 uh->len = htons(len);
935 uh->check = 0;
936
937 if (is_udplite)
938 csum = udplite_csum(skb);
939 else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
940 skb->ip_summed = CHECKSUM_NONE;
941 goto send;
942 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
943 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
944 goto send;
945 } else
946 csum = udp_csum(skb);
947
948 /* add protocol-dependent pseudo-header */
949 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
950 len, fl6->flowi6_proto, csum);
951 if (uh->check == 0)
952 uh->check = CSUM_MANGLED_0;
953
954 send:
955 err = ip6_send_skb(skb);
956 if (err) {
957 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
958 UDP6_INC_STATS(sock_net(sk),
959 UDP_MIB_SNDBUFERRORS, is_udplite);
960 err = 0;
961 }
962 } else {
963 UDP6_INC_STATS(sock_net(sk),
964 UDP_MIB_OUTDATAGRAMS, is_udplite);
965 }
966 return err;
967 }
968
969 static int udp_v6_push_pending_frames(struct sock *sk)
970 {
971 struct sk_buff *skb;
972 struct udp_sock *up = udp_sk(sk);
973 struct flowi6 fl6;
974 int err = 0;
975
976 if (up->pending == AF_INET)
977 return udp_push_pending_frames(sk);
978
979 /* ip6_finish_skb will release the cork, so make a copy of
980 * fl6 here.
981 */
982 fl6 = inet_sk(sk)->cork.fl.u.ip6;
983
984 skb = ip6_finish_skb(sk);
985 if (!skb)
986 goto out;
987
988 err = udp_v6_send_skb(skb, &fl6);
989
990 out:
991 up->len = 0;
992 up->pending = 0;
993 return err;
994 }
995
996 int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
997 {
998 struct ipv6_txoptions opt_space;
999 struct udp_sock *up = udp_sk(sk);
1000 struct inet_sock *inet = inet_sk(sk);
1001 struct ipv6_pinfo *np = inet6_sk(sk);
1002 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
1003 struct in6_addr *daddr, *final_p, final;
1004 struct ipv6_txoptions *opt = NULL;
1005 struct ipv6_txoptions *opt_to_free = NULL;
1006 struct ip6_flowlabel *flowlabel = NULL;
1007 struct flowi6 fl6;
1008 struct dst_entry *dst;
1009 struct ipcm6_cookie ipc6;
1010 int addr_len = msg->msg_namelen;
1011 int ulen = len;
1012 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1013 int err;
1014 int connected = 0;
1015 int is_udplite = IS_UDPLITE(sk);
1016 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1017 struct sockcm_cookie sockc;
1018
1019 ipc6.hlimit = -1;
1020 ipc6.tclass = -1;
1021 ipc6.dontfrag = -1;
1022
1023 /* destination address check */
1024 if (sin6) {
1025 if (addr_len < offsetof(struct sockaddr, sa_data))
1026 return -EINVAL;
1027
1028 switch (sin6->sin6_family) {
1029 case AF_INET6:
1030 if (addr_len < SIN6_LEN_RFC2133)
1031 return -EINVAL;
1032 daddr = &sin6->sin6_addr;
1033 break;
1034 case AF_INET:
1035 goto do_udp_sendmsg;
1036 case AF_UNSPEC:
1037 msg->msg_name = sin6 = NULL;
1038 msg->msg_namelen = addr_len = 0;
1039 daddr = NULL;
1040 break;
1041 default:
1042 return -EINVAL;
1043 }
1044 } else if (!up->pending) {
1045 if (sk->sk_state != TCP_ESTABLISHED)
1046 return -EDESTADDRREQ;
1047 daddr = &sk->sk_v6_daddr;
1048 } else
1049 daddr = NULL;
1050
1051 if (daddr) {
1052 if (ipv6_addr_v4mapped(daddr)) {
1053 struct sockaddr_in sin;
1054 sin.sin_family = AF_INET;
1055 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1056 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1057 msg->msg_name = &sin;
1058 msg->msg_namelen = sizeof(sin);
1059 do_udp_sendmsg:
1060 if (__ipv6_only_sock(sk))
1061 return -ENETUNREACH;
1062 return udp_sendmsg(sk, msg, len);
1063 }
1064 }
1065
1066 if (up->pending == AF_INET)
1067 return udp_sendmsg(sk, msg, len);
1068
1069 /* Rough check on arithmetic overflow,
1070 better check is made in ip6_append_data().
1071 */
1072 if (len > INT_MAX - sizeof(struct udphdr))
1073 return -EMSGSIZE;
1074
1075 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1076 if (up->pending) {
1077 /*
1078 * There are pending frames.
1079 * The socket lock must be held while it's corked.
1080 */
1081 lock_sock(sk);
1082 if (likely(up->pending)) {
1083 if (unlikely(up->pending != AF_INET6)) {
1084 release_sock(sk);
1085 return -EAFNOSUPPORT;
1086 }
1087 dst = NULL;
1088 goto do_append_data;
1089 }
1090 release_sock(sk);
1091 }
1092 ulen += sizeof(struct udphdr);
1093
1094 memset(&fl6, 0, sizeof(fl6));
1095
1096 if (sin6) {
1097 if (sin6->sin6_port == 0)
1098 return -EINVAL;
1099
1100 fl6.fl6_dport = sin6->sin6_port;
1101 daddr = &sin6->sin6_addr;
1102
1103 if (np->sndflow) {
1104 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1105 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1106 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1107 if (!flowlabel)
1108 return -EINVAL;
1109 }
1110 }
1111
1112 /*
1113 * Otherwise it will be difficult to maintain
1114 * sk->sk_dst_cache.
1115 */
1116 if (sk->sk_state == TCP_ESTABLISHED &&
1117 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1118 daddr = &sk->sk_v6_daddr;
1119
1120 if (addr_len >= sizeof(struct sockaddr_in6) &&
1121 sin6->sin6_scope_id &&
1122 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1123 fl6.flowi6_oif = sin6->sin6_scope_id;
1124 } else {
1125 if (sk->sk_state != TCP_ESTABLISHED)
1126 return -EDESTADDRREQ;
1127
1128 fl6.fl6_dport = inet->inet_dport;
1129 daddr = &sk->sk_v6_daddr;
1130 fl6.flowlabel = np->flow_label;
1131 connected = 1;
1132 }
1133
1134 if (!fl6.flowi6_oif)
1135 fl6.flowi6_oif = sk->sk_bound_dev_if;
1136
1137 if (!fl6.flowi6_oif)
1138 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1139
1140 fl6.flowi6_mark = sk->sk_mark;
1141 fl6.flowi6_uid = sk->sk_uid;
1142 sockc.tsflags = sk->sk_tsflags;
1143
1144 if (msg->msg_controllen) {
1145 opt = &opt_space;
1146 memset(opt, 0, sizeof(struct ipv6_txoptions));
1147 opt->tot_len = sizeof(*opt);
1148 ipc6.opt = opt;
1149
1150 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
1151 if (err < 0) {
1152 fl6_sock_release(flowlabel);
1153 return err;
1154 }
1155 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1156 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1157 if (!flowlabel)
1158 return -EINVAL;
1159 }
1160 if (!(opt->opt_nflen|opt->opt_flen))
1161 opt = NULL;
1162 connected = 0;
1163 }
1164 if (!opt) {
1165 opt = txopt_get(np);
1166 opt_to_free = opt;
1167 }
1168 if (flowlabel)
1169 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1170 opt = ipv6_fixup_options(&opt_space, opt);
1171 ipc6.opt = opt;
1172
1173 fl6.flowi6_proto = sk->sk_protocol;
1174 if (!ipv6_addr_any(daddr))
1175 fl6.daddr = *daddr;
1176 else
1177 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1178 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1179 fl6.saddr = np->saddr;
1180 fl6.fl6_sport = inet->inet_sport;
1181
1182 final_p = fl6_update_dst(&fl6, opt, &final);
1183 if (final_p)
1184 connected = 0;
1185
1186 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1187 fl6.flowi6_oif = np->mcast_oif;
1188 connected = 0;
1189 } else if (!fl6.flowi6_oif)
1190 fl6.flowi6_oif = np->ucast_oif;
1191
1192 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1193
1194 if (ipc6.tclass < 0)
1195 ipc6.tclass = np->tclass;
1196
1197 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
1198
1199 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
1200 if (IS_ERR(dst)) {
1201 err = PTR_ERR(dst);
1202 dst = NULL;
1203 goto out;
1204 }
1205
1206 if (ipc6.hlimit < 0)
1207 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
1208
1209 if (msg->msg_flags&MSG_CONFIRM)
1210 goto do_confirm;
1211 back_from_confirm:
1212
1213 /* Lockless fast path for the non-corking case */
1214 if (!corkreq) {
1215 struct sk_buff *skb;
1216
1217 skb = ip6_make_skb(sk, getfrag, msg, ulen,
1218 sizeof(struct udphdr), &ipc6,
1219 &fl6, (struct rt6_info *)dst,
1220 msg->msg_flags, &sockc);
1221 err = PTR_ERR(skb);
1222 if (!IS_ERR_OR_NULL(skb))
1223 err = udp_v6_send_skb(skb, &fl6);
1224 goto release_dst;
1225 }
1226
1227 lock_sock(sk);
1228 if (unlikely(up->pending)) {
1229 /* The socket is already corked while preparing it. */
1230 /* ... which is an evident application bug. --ANK */
1231 release_sock(sk);
1232
1233 net_dbg_ratelimited("udp cork app bug 2\n");
1234 err = -EINVAL;
1235 goto out;
1236 }
1237
1238 up->pending = AF_INET6;
1239
1240 do_append_data:
1241 if (ipc6.dontfrag < 0)
1242 ipc6.dontfrag = np->dontfrag;
1243 up->len += ulen;
1244 err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
1245 &ipc6, &fl6, (struct rt6_info *)dst,
1246 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc);
1247 if (err)
1248 udp_v6_flush_pending_frames(sk);
1249 else if (!corkreq)
1250 err = udp_v6_push_pending_frames(sk);
1251 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1252 up->pending = 0;
1253
1254 if (err > 0)
1255 err = np->recverr ? net_xmit_errno(err) : 0;
1256 release_sock(sk);
1257
1258 release_dst:
1259 if (dst) {
1260 if (connected) {
1261 ip6_dst_store(sk, dst,
1262 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1263 &sk->sk_v6_daddr : NULL,
1264 #ifdef CONFIG_IPV6_SUBTREES
1265 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1266 &np->saddr :
1267 #endif
1268 NULL);
1269 } else {
1270 dst_release(dst);
1271 }
1272 dst = NULL;
1273 }
1274
1275 out:
1276 dst_release(dst);
1277 fl6_sock_release(flowlabel);
1278 txopt_put(opt_to_free);
1279 if (!err)
1280 return len;
1281 /*
1282 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1283 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1284 * we don't have a good statistic (IpOutDiscards but it can be too many
1285 * things). We could add another new stat but at least for now that
1286 * seems like overkill.
1287 */
1288 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1289 UDP6_INC_STATS(sock_net(sk),
1290 UDP_MIB_SNDBUFERRORS, is_udplite);
1291 }
1292 return err;
1293
1294 do_confirm:
1295 dst_confirm(dst);
1296 if (!(msg->msg_flags&MSG_PROBE) || len)
1297 goto back_from_confirm;
1298 err = 0;
1299 goto out;
1300 }
1301
1302 void udpv6_destroy_sock(struct sock *sk)
1303 {
1304 struct udp_sock *up = udp_sk(sk);
1305 lock_sock(sk);
1306 udp_v6_flush_pending_frames(sk);
1307 release_sock(sk);
1308
1309 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1310 void (*encap_destroy)(struct sock *sk);
1311 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1312 if (encap_destroy)
1313 encap_destroy(sk);
1314 }
1315
1316 inet6_destroy_sock(sk);
1317 }
1318
1319 /*
1320 * Socket option code for UDP
1321 */
1322 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1323 char __user *optval, unsigned int optlen)
1324 {
1325 if (level == SOL_UDP || level == SOL_UDPLITE)
1326 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1327 udp_v6_push_pending_frames);
1328 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1329 }
1330
1331 #ifdef CONFIG_COMPAT
1332 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1333 char __user *optval, unsigned int optlen)
1334 {
1335 if (level == SOL_UDP || level == SOL_UDPLITE)
1336 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1337 udp_v6_push_pending_frames);
1338 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1339 }
1340 #endif
1341
1342 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1343 char __user *optval, int __user *optlen)
1344 {
1345 if (level == SOL_UDP || level == SOL_UDPLITE)
1346 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1347 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1348 }
1349
1350 #ifdef CONFIG_COMPAT
1351 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1352 char __user *optval, int __user *optlen)
1353 {
1354 if (level == SOL_UDP || level == SOL_UDPLITE)
1355 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1356 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1357 }
1358 #endif
1359
1360 static const struct inet6_protocol udpv6_protocol = {
1361 .handler = udpv6_rcv,
1362 .err_handler = udpv6_err,
1363 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1364 };
1365
1366 /* ------------------------------------------------------------------------ */
1367 #ifdef CONFIG_PROC_FS
1368 int udp6_seq_show(struct seq_file *seq, void *v)
1369 {
1370 if (v == SEQ_START_TOKEN) {
1371 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1372 } else {
1373 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1374 struct inet_sock *inet = inet_sk(v);
1375 __u16 srcp = ntohs(inet->inet_sport);
1376 __u16 destp = ntohs(inet->inet_dport);
1377 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1378 }
1379 return 0;
1380 }
1381
1382 static const struct file_operations udp6_afinfo_seq_fops = {
1383 .owner = THIS_MODULE,
1384 .open = udp_seq_open,
1385 .read = seq_read,
1386 .llseek = seq_lseek,
1387 .release = seq_release_net
1388 };
1389
1390 static struct udp_seq_afinfo udp6_seq_afinfo = {
1391 .name = "udp6",
1392 .family = AF_INET6,
1393 .udp_table = &udp_table,
1394 .seq_fops = &udp6_afinfo_seq_fops,
1395 .seq_ops = {
1396 .show = udp6_seq_show,
1397 },
1398 };
1399
1400 int __net_init udp6_proc_init(struct net *net)
1401 {
1402 return udp_proc_register(net, &udp6_seq_afinfo);
1403 }
1404
1405 void udp6_proc_exit(struct net *net)
1406 {
1407 udp_proc_unregister(net, &udp6_seq_afinfo);
1408 }
1409 #endif /* CONFIG_PROC_FS */
1410
1411 /* ------------------------------------------------------------------------ */
1412
1413 struct proto udpv6_prot = {
1414 .name = "UDPv6",
1415 .owner = THIS_MODULE,
1416 .close = udp_lib_close,
1417 .connect = ip6_datagram_connect,
1418 .disconnect = udp_disconnect,
1419 .ioctl = udp_ioctl,
1420 .init = udp_init_sock,
1421 .destroy = udpv6_destroy_sock,
1422 .setsockopt = udpv6_setsockopt,
1423 .getsockopt = udpv6_getsockopt,
1424 .sendmsg = udpv6_sendmsg,
1425 .recvmsg = udpv6_recvmsg,
1426 .release_cb = ip6_datagram_release_cb,
1427 .hash = udp_lib_hash,
1428 .unhash = udp_lib_unhash,
1429 .rehash = udp_v6_rehash,
1430 .get_port = udp_v6_get_port,
1431 .memory_allocated = &udp_memory_allocated,
1432 .sysctl_mem = sysctl_udp_mem,
1433 .sysctl_wmem = &sysctl_udp_wmem_min,
1434 .sysctl_rmem = &sysctl_udp_rmem_min,
1435 .obj_size = sizeof(struct udp6_sock),
1436 .h.udp_table = &udp_table,
1437 #ifdef CONFIG_COMPAT
1438 .compat_setsockopt = compat_udpv6_setsockopt,
1439 .compat_getsockopt = compat_udpv6_getsockopt,
1440 #endif
1441 .diag_destroy = udp_abort,
1442 };
1443
1444 static struct inet_protosw udpv6_protosw = {
1445 .type = SOCK_DGRAM,
1446 .protocol = IPPROTO_UDP,
1447 .prot = &udpv6_prot,
1448 .ops = &inet6_dgram_ops,
1449 .flags = INET_PROTOSW_PERMANENT,
1450 };
1451
1452 int __init udpv6_init(void)
1453 {
1454 int ret;
1455
1456 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1457 if (ret)
1458 goto out;
1459
1460 ret = inet6_register_protosw(&udpv6_protosw);
1461 if (ret)
1462 goto out_udpv6_protocol;
1463 out:
1464 return ret;
1465
1466 out_udpv6_protocol:
1467 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1468 goto out;
1469 }
1470
1471 void udpv6_exit(void)
1472 {
1473 inet6_unregister_protosw(&udpv6_protosw);
1474 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1475 }
ubuntu-bionic-kernel mirror