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ipv6: split inet6_ehashfn to hash functions per compilation unit
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/busy_poll.h>
50
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <trace/events/skb.h>
54 #include "udp_impl.h"
55
56 static unsigned int udp6_ehashfn(struct net *net,
57 const struct in6_addr *laddr,
58 const u16 lport,
59 const struct in6_addr *faddr,
60 const __be16 fport)
61 {
62 const u32 lhash = (__force u32)laddr->s6_addr32[3];
63 const u32 fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
64 return __inet6_ehashfn(lhash, lport, fhash, fport,
65 inet_ehash_secret + net_hash_mix(net));
66 }
67
68 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
69 {
70 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
71 int sk_ipv6only = ipv6_only_sock(sk);
72 int sk2_ipv6only = inet_v6_ipv6only(sk2);
73 int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
74 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
75
76 /* if both are mapped, treat as IPv4 */
77 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
78 return (!sk2_ipv6only &&
79 (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
80 sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
81
82 if (addr_type2 == IPV6_ADDR_ANY &&
83 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
84 return 1;
85
86 if (addr_type == IPV6_ADDR_ANY &&
87 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
88 return 1;
89
90 if (sk2_rcv_saddr6 &&
91 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
92 return 1;
93
94 return 0;
95 }
96
97 static unsigned int udp6_portaddr_hash(struct net *net,
98 const struct in6_addr *addr6,
99 unsigned int port)
100 {
101 unsigned int hash, mix = net_hash_mix(net);
102
103 if (ipv6_addr_any(addr6))
104 hash = jhash_1word(0, mix);
105 else if (ipv6_addr_v4mapped(addr6))
106 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
107 else
108 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
109
110 return hash ^ port;
111 }
112
113
114 int udp_v6_get_port(struct sock *sk, unsigned short snum)
115 {
116 unsigned int hash2_nulladdr =
117 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
118 unsigned int hash2_partial =
119 udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
120
121 /* precompute partial secondary hash */
122 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
123 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
124 }
125
126 static void udp_v6_rehash(struct sock *sk)
127 {
128 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
129 &sk->sk_v6_rcv_saddr,
130 inet_sk(sk)->inet_num);
131
132 udp_lib_rehash(sk, new_hash);
133 }
134
135 static inline int compute_score(struct sock *sk, struct net *net,
136 unsigned short hnum,
137 const struct in6_addr *saddr, __be16 sport,
138 const struct in6_addr *daddr, __be16 dport,
139 int dif)
140 {
141 int score = -1;
142
143 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
144 sk->sk_family == PF_INET6) {
145 struct inet_sock *inet = inet_sk(sk);
146
147 score = 0;
148 if (inet->inet_dport) {
149 if (inet->inet_dport != sport)
150 return -1;
151 score++;
152 }
153 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
154 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
155 return -1;
156 score++;
157 }
158 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
159 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
160 return -1;
161 score++;
162 }
163 if (sk->sk_bound_dev_if) {
164 if (sk->sk_bound_dev_if != dif)
165 return -1;
166 score++;
167 }
168 }
169 return score;
170 }
171
172 #define SCORE2_MAX (1 + 1 + 1)
173 static inline int compute_score2(struct sock *sk, struct net *net,
174 const struct in6_addr *saddr, __be16 sport,
175 const struct in6_addr *daddr, unsigned short hnum,
176 int dif)
177 {
178 int score = -1;
179
180 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
181 sk->sk_family == PF_INET6) {
182 struct inet_sock *inet = inet_sk(sk);
183
184 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
185 return -1;
186 score = 0;
187 if (inet->inet_dport) {
188 if (inet->inet_dport != sport)
189 return -1;
190 score++;
191 }
192 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
193 if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
194 return -1;
195 score++;
196 }
197 if (sk->sk_bound_dev_if) {
198 if (sk->sk_bound_dev_if != dif)
199 return -1;
200 score++;
201 }
202 }
203 return score;
204 }
205
206
207 /* called with read_rcu_lock() */
208 static struct sock *udp6_lib_lookup2(struct net *net,
209 const struct in6_addr *saddr, __be16 sport,
210 const struct in6_addr *daddr, unsigned int hnum, int dif,
211 struct udp_hslot *hslot2, unsigned int slot2)
212 {
213 struct sock *sk, *result;
214 struct hlist_nulls_node *node;
215 int score, badness, matches = 0, reuseport = 0;
216 u32 hash = 0;
217
218 begin:
219 result = NULL;
220 badness = -1;
221 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
222 score = compute_score2(sk, net, saddr, sport,
223 daddr, hnum, dif);
224 if (score > badness) {
225 result = sk;
226 badness = score;
227 reuseport = sk->sk_reuseport;
228 if (reuseport) {
229 hash = udp6_ehashfn(net, daddr, hnum,
230 saddr, sport);
231 matches = 1;
232 } else if (score == SCORE2_MAX)
233 goto exact_match;
234 } else if (score == badness && reuseport) {
235 matches++;
236 if (((u64)hash * matches) >> 32 == 0)
237 result = sk;
238 hash = next_pseudo_random32(hash);
239 }
240 }
241 /*
242 * if the nulls value we got at the end of this lookup is
243 * not the expected one, we must restart lookup.
244 * We probably met an item that was moved to another chain.
245 */
246 if (get_nulls_value(node) != slot2)
247 goto begin;
248
249 if (result) {
250 exact_match:
251 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
252 result = NULL;
253 else if (unlikely(compute_score2(result, net, saddr, sport,
254 daddr, hnum, dif) < badness)) {
255 sock_put(result);
256 goto begin;
257 }
258 }
259 return result;
260 }
261
262 struct sock *__udp6_lib_lookup(struct net *net,
263 const struct in6_addr *saddr, __be16 sport,
264 const struct in6_addr *daddr, __be16 dport,
265 int dif, struct udp_table *udptable)
266 {
267 struct sock *sk, *result;
268 struct hlist_nulls_node *node;
269 unsigned short hnum = ntohs(dport);
270 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
271 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
272 int score, badness, matches = 0, reuseport = 0;
273 u32 hash = 0;
274
275 rcu_read_lock();
276 if (hslot->count > 10) {
277 hash2 = udp6_portaddr_hash(net, daddr, hnum);
278 slot2 = hash2 & udptable->mask;
279 hslot2 = &udptable->hash2[slot2];
280 if (hslot->count < hslot2->count)
281 goto begin;
282
283 result = udp6_lib_lookup2(net, saddr, sport,
284 daddr, hnum, dif,
285 hslot2, slot2);
286 if (!result) {
287 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
288 slot2 = hash2 & udptable->mask;
289 hslot2 = &udptable->hash2[slot2];
290 if (hslot->count < hslot2->count)
291 goto begin;
292
293 result = udp6_lib_lookup2(net, saddr, sport,
294 &in6addr_any, hnum, dif,
295 hslot2, slot2);
296 }
297 rcu_read_unlock();
298 return result;
299 }
300 begin:
301 result = NULL;
302 badness = -1;
303 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
304 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
305 if (score > badness) {
306 result = sk;
307 badness = score;
308 reuseport = sk->sk_reuseport;
309 if (reuseport) {
310 hash = udp6_ehashfn(net, daddr, hnum,
311 saddr, sport);
312 matches = 1;
313 }
314 } else if (score == badness && reuseport) {
315 matches++;
316 if (((u64)hash * matches) >> 32 == 0)
317 result = sk;
318 hash = next_pseudo_random32(hash);
319 }
320 }
321 /*
322 * if the nulls value we got at the end of this lookup is
323 * not the expected one, we must restart lookup.
324 * We probably met an item that was moved to another chain.
325 */
326 if (get_nulls_value(node) != slot)
327 goto begin;
328
329 if (result) {
330 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
331 result = NULL;
332 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
333 daddr, dport, dif) < badness)) {
334 sock_put(result);
335 goto begin;
336 }
337 }
338 rcu_read_unlock();
339 return result;
340 }
341 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
342
343 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
344 __be16 sport, __be16 dport,
345 struct udp_table *udptable)
346 {
347 struct sock *sk;
348 const struct ipv6hdr *iph = ipv6_hdr(skb);
349
350 if (unlikely(sk = skb_steal_sock(skb)))
351 return sk;
352 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
353 &iph->daddr, dport, inet6_iif(skb),
354 udptable);
355 }
356
357 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
358 const struct in6_addr *daddr, __be16 dport, int dif)
359 {
360 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
361 }
362 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
363
364
365 /*
366 * This should be easy, if there is something there we
367 * return it, otherwise we block.
368 */
369
370 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
371 struct msghdr *msg, size_t len,
372 int noblock, int flags, int *addr_len)
373 {
374 struct ipv6_pinfo *np = inet6_sk(sk);
375 struct inet_sock *inet = inet_sk(sk);
376 struct sk_buff *skb;
377 unsigned int ulen, copied;
378 int peeked, off = 0;
379 int err;
380 int is_udplite = IS_UDPLITE(sk);
381 int is_udp4;
382 bool slow;
383
384 if (addr_len)
385 *addr_len = sizeof(struct sockaddr_in6);
386
387 if (flags & MSG_ERRQUEUE)
388 return ipv6_recv_error(sk, msg, len);
389
390 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
391 return ipv6_recv_rxpmtu(sk, msg, len);
392
393 try_again:
394 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
395 &peeked, &off, &err);
396 if (!skb)
397 goto out;
398
399 ulen = skb->len - sizeof(struct udphdr);
400 copied = len;
401 if (copied > ulen)
402 copied = ulen;
403 else if (copied < ulen)
404 msg->msg_flags |= MSG_TRUNC;
405
406 is_udp4 = (skb->protocol == htons(ETH_P_IP));
407
408 /*
409 * If checksum is needed at all, try to do it while copying the
410 * data. If the data is truncated, or if we only want a partial
411 * coverage checksum (UDP-Lite), do it before the copy.
412 */
413
414 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
415 if (udp_lib_checksum_complete(skb))
416 goto csum_copy_err;
417 }
418
419 if (skb_csum_unnecessary(skb))
420 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
421 msg->msg_iov, copied);
422 else {
423 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
424 if (err == -EINVAL)
425 goto csum_copy_err;
426 }
427 if (unlikely(err)) {
428 trace_kfree_skb(skb, udpv6_recvmsg);
429 if (!peeked) {
430 atomic_inc(&sk->sk_drops);
431 if (is_udp4)
432 UDP_INC_STATS_USER(sock_net(sk),
433 UDP_MIB_INERRORS,
434 is_udplite);
435 else
436 UDP6_INC_STATS_USER(sock_net(sk),
437 UDP_MIB_INERRORS,
438 is_udplite);
439 }
440 goto out_free;
441 }
442 if (!peeked) {
443 if (is_udp4)
444 UDP_INC_STATS_USER(sock_net(sk),
445 UDP_MIB_INDATAGRAMS, is_udplite);
446 else
447 UDP6_INC_STATS_USER(sock_net(sk),
448 UDP_MIB_INDATAGRAMS, is_udplite);
449 }
450
451 sock_recv_ts_and_drops(msg, sk, skb);
452
453 /* Copy the address. */
454 if (msg->msg_name) {
455 struct sockaddr_in6 *sin6;
456
457 sin6 = (struct sockaddr_in6 *) msg->msg_name;
458 sin6->sin6_family = AF_INET6;
459 sin6->sin6_port = udp_hdr(skb)->source;
460 sin6->sin6_flowinfo = 0;
461
462 if (is_udp4) {
463 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
464 &sin6->sin6_addr);
465 sin6->sin6_scope_id = 0;
466 } else {
467 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
468 sin6->sin6_scope_id =
469 ipv6_iface_scope_id(&sin6->sin6_addr,
470 IP6CB(skb)->iif);
471 }
472
473 }
474 if (is_udp4) {
475 if (inet->cmsg_flags)
476 ip_cmsg_recv(msg, skb);
477 } else {
478 if (np->rxopt.all)
479 ip6_datagram_recv_ctl(sk, msg, skb);
480 }
481
482 err = copied;
483 if (flags & MSG_TRUNC)
484 err = ulen;
485
486 out_free:
487 skb_free_datagram_locked(sk, skb);
488 out:
489 return err;
490
491 csum_copy_err:
492 slow = lock_sock_fast(sk);
493 if (!skb_kill_datagram(sk, skb, flags)) {
494 if (is_udp4) {
495 UDP_INC_STATS_USER(sock_net(sk),
496 UDP_MIB_CSUMERRORS, is_udplite);
497 UDP_INC_STATS_USER(sock_net(sk),
498 UDP_MIB_INERRORS, is_udplite);
499 } else {
500 UDP6_INC_STATS_USER(sock_net(sk),
501 UDP_MIB_CSUMERRORS, is_udplite);
502 UDP6_INC_STATS_USER(sock_net(sk),
503 UDP_MIB_INERRORS, is_udplite);
504 }
505 }
506 unlock_sock_fast(sk, slow);
507
508 if (noblock)
509 return -EAGAIN;
510
511 /* starting over for a new packet */
512 msg->msg_flags &= ~MSG_TRUNC;
513 goto try_again;
514 }
515
516 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
517 u8 type, u8 code, int offset, __be32 info,
518 struct udp_table *udptable)
519 {
520 struct ipv6_pinfo *np;
521 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
522 const struct in6_addr *saddr = &hdr->saddr;
523 const struct in6_addr *daddr = &hdr->daddr;
524 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
525 struct sock *sk;
526 int err;
527
528 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
529 saddr, uh->source, inet6_iif(skb), udptable);
530 if (sk == NULL)
531 return;
532
533 if (type == ICMPV6_PKT_TOOBIG)
534 ip6_sk_update_pmtu(skb, sk, info);
535 if (type == NDISC_REDIRECT) {
536 ip6_sk_redirect(skb, sk);
537 goto out;
538 }
539
540 np = inet6_sk(sk);
541
542 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
543 goto out;
544
545 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
546 goto out;
547
548 if (np->recverr)
549 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
550
551 sk->sk_err = err;
552 sk->sk_error_report(sk);
553 out:
554 sock_put(sk);
555 }
556
557 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
558 {
559 int rc;
560
561 if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
562 sock_rps_save_rxhash(sk, skb);
563 sk_mark_napi_id(sk, skb);
564 }
565
566 rc = sock_queue_rcv_skb(sk, skb);
567 if (rc < 0) {
568 int is_udplite = IS_UDPLITE(sk);
569
570 /* Note that an ENOMEM error is charged twice */
571 if (rc == -ENOMEM)
572 UDP6_INC_STATS_BH(sock_net(sk),
573 UDP_MIB_RCVBUFERRORS, is_udplite);
574 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
575 kfree_skb(skb);
576 return -1;
577 }
578 return 0;
579 }
580
581 static __inline__ void udpv6_err(struct sk_buff *skb,
582 struct inet6_skb_parm *opt, u8 type,
583 u8 code, int offset, __be32 info )
584 {
585 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
586 }
587
588 static struct static_key udpv6_encap_needed __read_mostly;
589 void udpv6_encap_enable(void)
590 {
591 if (!static_key_enabled(&udpv6_encap_needed))
592 static_key_slow_inc(&udpv6_encap_needed);
593 }
594 EXPORT_SYMBOL(udpv6_encap_enable);
595
596 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
597 {
598 struct udp_sock *up = udp_sk(sk);
599 int rc;
600 int is_udplite = IS_UDPLITE(sk);
601
602 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
603 goto drop;
604
605 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
606 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
607
608 /*
609 * This is an encapsulation socket so pass the skb to
610 * the socket's udp_encap_rcv() hook. Otherwise, just
611 * fall through and pass this up the UDP socket.
612 * up->encap_rcv() returns the following value:
613 * =0 if skb was successfully passed to the encap
614 * handler or was discarded by it.
615 * >0 if skb should be passed on to UDP.
616 * <0 if skb should be resubmitted as proto -N
617 */
618
619 /* if we're overly short, let UDP handle it */
620 encap_rcv = ACCESS_ONCE(up->encap_rcv);
621 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
622 int ret;
623
624 ret = encap_rcv(sk, skb);
625 if (ret <= 0) {
626 UDP_INC_STATS_BH(sock_net(sk),
627 UDP_MIB_INDATAGRAMS,
628 is_udplite);
629 return -ret;
630 }
631 }
632
633 /* FALLTHROUGH -- it's a UDP Packet */
634 }
635
636 /*
637 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
638 */
639 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
640
641 if (up->pcrlen == 0) { /* full coverage was set */
642 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
643 " %d while full coverage %d requested\n",
644 UDP_SKB_CB(skb)->cscov, skb->len);
645 goto drop;
646 }
647 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
648 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
649 "too small, need min %d\n",
650 UDP_SKB_CB(skb)->cscov, up->pcrlen);
651 goto drop;
652 }
653 }
654
655 if (rcu_access_pointer(sk->sk_filter)) {
656 if (udp_lib_checksum_complete(skb))
657 goto csum_error;
658 }
659
660 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
661 goto drop;
662
663 skb_dst_drop(skb);
664
665 bh_lock_sock(sk);
666 rc = 0;
667 if (!sock_owned_by_user(sk))
668 rc = __udpv6_queue_rcv_skb(sk, skb);
669 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
670 bh_unlock_sock(sk);
671 goto drop;
672 }
673 bh_unlock_sock(sk);
674
675 return rc;
676 csum_error:
677 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
678 drop:
679 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
680 atomic_inc(&sk->sk_drops);
681 kfree_skb(skb);
682 return -1;
683 }
684
685 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
686 __be16 loc_port, const struct in6_addr *loc_addr,
687 __be16 rmt_port, const struct in6_addr *rmt_addr,
688 int dif)
689 {
690 struct hlist_nulls_node *node;
691 struct sock *s = sk;
692 unsigned short num = ntohs(loc_port);
693
694 sk_nulls_for_each_from(s, node) {
695 struct inet_sock *inet = inet_sk(s);
696
697 if (!net_eq(sock_net(s), net))
698 continue;
699
700 if (udp_sk(s)->udp_port_hash == num &&
701 s->sk_family == PF_INET6) {
702 if (inet->inet_dport) {
703 if (inet->inet_dport != rmt_port)
704 continue;
705 }
706 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
707 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
708 continue;
709
710 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
711 continue;
712
713 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
714 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
715 continue;
716 }
717 if (!inet6_mc_check(s, loc_addr, rmt_addr))
718 continue;
719 return s;
720 }
721 }
722 return NULL;
723 }
724
725 static void flush_stack(struct sock **stack, unsigned int count,
726 struct sk_buff *skb, unsigned int final)
727 {
728 struct sk_buff *skb1 = NULL;
729 struct sock *sk;
730 unsigned int i;
731
732 for (i = 0; i < count; i++) {
733 sk = stack[i];
734 if (likely(skb1 == NULL))
735 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
736 if (!skb1) {
737 atomic_inc(&sk->sk_drops);
738 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
739 IS_UDPLITE(sk));
740 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
741 IS_UDPLITE(sk));
742 }
743
744 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
745 skb1 = NULL;
746 }
747 if (unlikely(skb1))
748 kfree_skb(skb1);
749 }
750 /*
751 * Note: called only from the BH handler context,
752 * so we don't need to lock the hashes.
753 */
754 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
755 const struct in6_addr *saddr, const struct in6_addr *daddr,
756 struct udp_table *udptable)
757 {
758 struct sock *sk, *stack[256 / sizeof(struct sock *)];
759 const struct udphdr *uh = udp_hdr(skb);
760 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
761 int dif;
762 unsigned int i, count = 0;
763
764 spin_lock(&hslot->lock);
765 sk = sk_nulls_head(&hslot->head);
766 dif = inet6_iif(skb);
767 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
768 while (sk) {
769 stack[count++] = sk;
770 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
771 uh->source, saddr, dif);
772 if (unlikely(count == ARRAY_SIZE(stack))) {
773 if (!sk)
774 break;
775 flush_stack(stack, count, skb, ~0);
776 count = 0;
777 }
778 }
779 /*
780 * before releasing the lock, we must take reference on sockets
781 */
782 for (i = 0; i < count; i++)
783 sock_hold(stack[i]);
784
785 spin_unlock(&hslot->lock);
786
787 if (count) {
788 flush_stack(stack, count, skb, count - 1);
789
790 for (i = 0; i < count; i++)
791 sock_put(stack[i]);
792 } else {
793 kfree_skb(skb);
794 }
795 return 0;
796 }
797
798 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
799 int proto)
800 {
801 struct net *net = dev_net(skb->dev);
802 struct sock *sk;
803 struct udphdr *uh;
804 const struct in6_addr *saddr, *daddr;
805 u32 ulen = 0;
806
807 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
808 goto discard;
809
810 saddr = &ipv6_hdr(skb)->saddr;
811 daddr = &ipv6_hdr(skb)->daddr;
812 uh = udp_hdr(skb);
813
814 ulen = ntohs(uh->len);
815 if (ulen > skb->len)
816 goto short_packet;
817
818 if (proto == IPPROTO_UDP) {
819 /* UDP validates ulen. */
820
821 /* Check for jumbo payload */
822 if (ulen == 0)
823 ulen = skb->len;
824
825 if (ulen < sizeof(*uh))
826 goto short_packet;
827
828 if (ulen < skb->len) {
829 if (pskb_trim_rcsum(skb, ulen))
830 goto short_packet;
831 saddr = &ipv6_hdr(skb)->saddr;
832 daddr = &ipv6_hdr(skb)->daddr;
833 uh = udp_hdr(skb);
834 }
835 }
836
837 if (udp6_csum_init(skb, uh, proto))
838 goto csum_error;
839
840 /*
841 * Multicast receive code
842 */
843 if (ipv6_addr_is_multicast(daddr))
844 return __udp6_lib_mcast_deliver(net, skb,
845 saddr, daddr, udptable);
846
847 /* Unicast */
848
849 /*
850 * check socket cache ... must talk to Alan about his plans
851 * for sock caches... i'll skip this for now.
852 */
853 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
854 if (sk != NULL) {
855 int ret;
856
857 ret = udpv6_queue_rcv_skb(sk, skb);
858 sock_put(sk);
859
860 /* a return value > 0 means to resubmit the input, but
861 * it wants the return to be -protocol, or 0
862 */
863 if (ret > 0)
864 return -ret;
865
866 return 0;
867 }
868
869 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
870 goto discard;
871
872 if (udp_lib_checksum_complete(skb))
873 goto csum_error;
874
875 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
876 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
877
878 kfree_skb(skb);
879 return 0;
880
881 short_packet:
882 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
883 proto == IPPROTO_UDPLITE ? "-Lite" : "",
884 saddr,
885 ntohs(uh->source),
886 ulen,
887 skb->len,
888 daddr,
889 ntohs(uh->dest));
890 goto discard;
891 csum_error:
892 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
893 discard:
894 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
895 kfree_skb(skb);
896 return 0;
897 }
898
899 static __inline__ int udpv6_rcv(struct sk_buff *skb)
900 {
901 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
902 }
903
904 /*
905 * Throw away all pending data and cancel the corking. Socket is locked.
906 */
907 static void udp_v6_flush_pending_frames(struct sock *sk)
908 {
909 struct udp_sock *up = udp_sk(sk);
910
911 if (up->pending == AF_INET)
912 udp_flush_pending_frames(sk);
913 else if (up->pending) {
914 up->len = 0;
915 up->pending = 0;
916 ip6_flush_pending_frames(sk);
917 }
918 }
919
920 /**
921 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
922 * @sk: socket we are sending on
923 * @skb: sk_buff containing the filled-in UDP header
924 * (checksum field must be zeroed out)
925 */
926 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
927 const struct in6_addr *saddr,
928 const struct in6_addr *daddr, int len)
929 {
930 unsigned int offset;
931 struct udphdr *uh = udp_hdr(skb);
932 __wsum csum = 0;
933
934 if (skb_queue_len(&sk->sk_write_queue) == 1) {
935 /* Only one fragment on the socket. */
936 skb->csum_start = skb_transport_header(skb) - skb->head;
937 skb->csum_offset = offsetof(struct udphdr, check);
938 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
939 } else {
940 /*
941 * HW-checksum won't work as there are two or more
942 * fragments on the socket so that all csums of sk_buffs
943 * should be together
944 */
945 offset = skb_transport_offset(skb);
946 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
947
948 skb->ip_summed = CHECKSUM_NONE;
949
950 skb_queue_walk(&sk->sk_write_queue, skb) {
951 csum = csum_add(csum, skb->csum);
952 }
953
954 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
955 csum);
956 if (uh->check == 0)
957 uh->check = CSUM_MANGLED_0;
958 }
959 }
960
961 /*
962 * Sending
963 */
964
965 static int udp_v6_push_pending_frames(struct sock *sk)
966 {
967 struct sk_buff *skb;
968 struct udphdr *uh;
969 struct udp_sock *up = udp_sk(sk);
970 struct inet_sock *inet = inet_sk(sk);
971 struct flowi6 *fl6;
972 int err = 0;
973 int is_udplite = IS_UDPLITE(sk);
974 __wsum csum = 0;
975
976 if (up->pending == AF_INET)
977 return udp_push_pending_frames(sk);
978
979 fl6 = &inet->cork.fl.u.ip6;
980
981 /* Grab the skbuff where UDP header space exists. */
982 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
983 goto out;
984
985 /*
986 * Create a UDP header
987 */
988 uh = udp_hdr(skb);
989 uh->source = fl6->fl6_sport;
990 uh->dest = fl6->fl6_dport;
991 uh->len = htons(up->len);
992 uh->check = 0;
993
994 if (is_udplite)
995 csum = udplite_csum_outgoing(sk, skb);
996 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
997 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
998 up->len);
999 goto send;
1000 } else
1001 csum = udp_csum_outgoing(sk, skb);
1002
1003 /* add protocol-dependent pseudo-header */
1004 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
1005 up->len, fl6->flowi6_proto, csum);
1006 if (uh->check == 0)
1007 uh->check = CSUM_MANGLED_0;
1008
1009 send:
1010 err = ip6_push_pending_frames(sk);
1011 if (err) {
1012 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
1013 UDP6_INC_STATS_USER(sock_net(sk),
1014 UDP_MIB_SNDBUFERRORS, is_udplite);
1015 err = 0;
1016 }
1017 } else
1018 UDP6_INC_STATS_USER(sock_net(sk),
1019 UDP_MIB_OUTDATAGRAMS, is_udplite);
1020 out:
1021 up->len = 0;
1022 up->pending = 0;
1023 return err;
1024 }
1025
1026 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1027 struct msghdr *msg, size_t len)
1028 {
1029 struct ipv6_txoptions opt_space;
1030 struct udp_sock *up = udp_sk(sk);
1031 struct inet_sock *inet = inet_sk(sk);
1032 struct ipv6_pinfo *np = inet6_sk(sk);
1033 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1034 struct in6_addr *daddr, *final_p, final;
1035 struct ipv6_txoptions *opt = NULL;
1036 struct ip6_flowlabel *flowlabel = NULL;
1037 struct flowi6 fl6;
1038 struct dst_entry *dst;
1039 int addr_len = msg->msg_namelen;
1040 int ulen = len;
1041 int hlimit = -1;
1042 int tclass = -1;
1043 int dontfrag = -1;
1044 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1045 int err;
1046 int connected = 0;
1047 int is_udplite = IS_UDPLITE(sk);
1048 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1049
1050 /* destination address check */
1051 if (sin6) {
1052 if (addr_len < offsetof(struct sockaddr, sa_data))
1053 return -EINVAL;
1054
1055 switch (sin6->sin6_family) {
1056 case AF_INET6:
1057 if (addr_len < SIN6_LEN_RFC2133)
1058 return -EINVAL;
1059 daddr = &sin6->sin6_addr;
1060 break;
1061 case AF_INET:
1062 goto do_udp_sendmsg;
1063 case AF_UNSPEC:
1064 msg->msg_name = sin6 = NULL;
1065 msg->msg_namelen = addr_len = 0;
1066 daddr = NULL;
1067 break;
1068 default:
1069 return -EINVAL;
1070 }
1071 } else if (!up->pending) {
1072 if (sk->sk_state != TCP_ESTABLISHED)
1073 return -EDESTADDRREQ;
1074 daddr = &sk->sk_v6_daddr;
1075 } else
1076 daddr = NULL;
1077
1078 if (daddr) {
1079 if (ipv6_addr_v4mapped(daddr)) {
1080 struct sockaddr_in sin;
1081 sin.sin_family = AF_INET;
1082 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1083 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1084 msg->msg_name = &sin;
1085 msg->msg_namelen = sizeof(sin);
1086 do_udp_sendmsg:
1087 if (__ipv6_only_sock(sk))
1088 return -ENETUNREACH;
1089 return udp_sendmsg(iocb, sk, msg, len);
1090 }
1091 }
1092
1093 if (up->pending == AF_INET)
1094 return udp_sendmsg(iocb, sk, msg, len);
1095
1096 /* Rough check on arithmetic overflow,
1097 better check is made in ip6_append_data().
1098 */
1099 if (len > INT_MAX - sizeof(struct udphdr))
1100 return -EMSGSIZE;
1101
1102 if (up->pending) {
1103 /*
1104 * There are pending frames.
1105 * The socket lock must be held while it's corked.
1106 */
1107 lock_sock(sk);
1108 if (likely(up->pending)) {
1109 if (unlikely(up->pending != AF_INET6)) {
1110 release_sock(sk);
1111 return -EAFNOSUPPORT;
1112 }
1113 dst = NULL;
1114 goto do_append_data;
1115 }
1116 release_sock(sk);
1117 }
1118 ulen += sizeof(struct udphdr);
1119
1120 memset(&fl6, 0, sizeof(fl6));
1121
1122 if (sin6) {
1123 if (sin6->sin6_port == 0)
1124 return -EINVAL;
1125
1126 fl6.fl6_dport = sin6->sin6_port;
1127 daddr = &sin6->sin6_addr;
1128
1129 if (np->sndflow) {
1130 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1131 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1132 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1133 if (flowlabel == NULL)
1134 return -EINVAL;
1135 daddr = &flowlabel->dst;
1136 }
1137 }
1138
1139 /*
1140 * Otherwise it will be difficult to maintain
1141 * sk->sk_dst_cache.
1142 */
1143 if (sk->sk_state == TCP_ESTABLISHED &&
1144 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
1145 daddr = &sk->sk_v6_daddr;
1146
1147 if (addr_len >= sizeof(struct sockaddr_in6) &&
1148 sin6->sin6_scope_id &&
1149 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1150 fl6.flowi6_oif = sin6->sin6_scope_id;
1151 } else {
1152 if (sk->sk_state != TCP_ESTABLISHED)
1153 return -EDESTADDRREQ;
1154
1155 fl6.fl6_dport = inet->inet_dport;
1156 daddr = &sk->sk_v6_daddr;
1157 fl6.flowlabel = np->flow_label;
1158 connected = 1;
1159 }
1160
1161 if (!fl6.flowi6_oif)
1162 fl6.flowi6_oif = sk->sk_bound_dev_if;
1163
1164 if (!fl6.flowi6_oif)
1165 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1166
1167 fl6.flowi6_mark = sk->sk_mark;
1168
1169 if (msg->msg_controllen) {
1170 opt = &opt_space;
1171 memset(opt, 0, sizeof(struct ipv6_txoptions));
1172 opt->tot_len = sizeof(*opt);
1173
1174 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1175 &hlimit, &tclass, &dontfrag);
1176 if (err < 0) {
1177 fl6_sock_release(flowlabel);
1178 return err;
1179 }
1180 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1181 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1182 if (flowlabel == NULL)
1183 return -EINVAL;
1184 }
1185 if (!(opt->opt_nflen|opt->opt_flen))
1186 opt = NULL;
1187 connected = 0;
1188 }
1189 if (opt == NULL)
1190 opt = np->opt;
1191 if (flowlabel)
1192 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1193 opt = ipv6_fixup_options(&opt_space, opt);
1194
1195 fl6.flowi6_proto = sk->sk_protocol;
1196 if (!ipv6_addr_any(daddr))
1197 fl6.daddr = *daddr;
1198 else
1199 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1200 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1201 fl6.saddr = np->saddr;
1202 fl6.fl6_sport = inet->inet_sport;
1203
1204 final_p = fl6_update_dst(&fl6, opt, &final);
1205 if (final_p)
1206 connected = 0;
1207
1208 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1209 fl6.flowi6_oif = np->mcast_oif;
1210 connected = 0;
1211 } else if (!fl6.flowi6_oif)
1212 fl6.flowi6_oif = np->ucast_oif;
1213
1214 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1215
1216 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1217 if (IS_ERR(dst)) {
1218 err = PTR_ERR(dst);
1219 dst = NULL;
1220 goto out;
1221 }
1222
1223 if (hlimit < 0) {
1224 if (ipv6_addr_is_multicast(&fl6.daddr))
1225 hlimit = np->mcast_hops;
1226 else
1227 hlimit = np->hop_limit;
1228 if (hlimit < 0)
1229 hlimit = ip6_dst_hoplimit(dst);
1230 }
1231
1232 if (tclass < 0)
1233 tclass = np->tclass;
1234
1235 if (dontfrag < 0)
1236 dontfrag = np->dontfrag;
1237
1238 if (msg->msg_flags&MSG_CONFIRM)
1239 goto do_confirm;
1240 back_from_confirm:
1241
1242 lock_sock(sk);
1243 if (unlikely(up->pending)) {
1244 /* The socket is already corked while preparing it. */
1245 /* ... which is an evident application bug. --ANK */
1246 release_sock(sk);
1247
1248 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1249 err = -EINVAL;
1250 goto out;
1251 }
1252
1253 up->pending = AF_INET6;
1254
1255 do_append_data:
1256 up->len += ulen;
1257 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1258 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1259 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1260 (struct rt6_info*)dst,
1261 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1262 if (err)
1263 udp_v6_flush_pending_frames(sk);
1264 else if (!corkreq)
1265 err = udp_v6_push_pending_frames(sk);
1266 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1267 up->pending = 0;
1268
1269 if (dst) {
1270 if (connected) {
1271 ip6_dst_store(sk, dst,
1272 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
1273 &sk->sk_v6_daddr : NULL,
1274 #ifdef CONFIG_IPV6_SUBTREES
1275 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1276 &np->saddr :
1277 #endif
1278 NULL);
1279 } else {
1280 dst_release(dst);
1281 }
1282 dst = NULL;
1283 }
1284
1285 if (err > 0)
1286 err = np->recverr ? net_xmit_errno(err) : 0;
1287 release_sock(sk);
1288 out:
1289 dst_release(dst);
1290 fl6_sock_release(flowlabel);
1291 if (!err)
1292 return len;
1293 /*
1294 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1295 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1296 * we don't have a good statistic (IpOutDiscards but it can be too many
1297 * things). We could add another new stat but at least for now that
1298 * seems like overkill.
1299 */
1300 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1301 UDP6_INC_STATS_USER(sock_net(sk),
1302 UDP_MIB_SNDBUFERRORS, is_udplite);
1303 }
1304 return err;
1305
1306 do_confirm:
1307 dst_confirm(dst);
1308 if (!(msg->msg_flags&MSG_PROBE) || len)
1309 goto back_from_confirm;
1310 err = 0;
1311 goto out;
1312 }
1313
1314 void udpv6_destroy_sock(struct sock *sk)
1315 {
1316 struct udp_sock *up = udp_sk(sk);
1317 lock_sock(sk);
1318 udp_v6_flush_pending_frames(sk);
1319 release_sock(sk);
1320
1321 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1322 void (*encap_destroy)(struct sock *sk);
1323 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1324 if (encap_destroy)
1325 encap_destroy(sk);
1326 }
1327
1328 inet6_destroy_sock(sk);
1329 }
1330
1331 /*
1332 * Socket option code for UDP
1333 */
1334 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1335 char __user *optval, unsigned int optlen)
1336 {
1337 if (level == SOL_UDP || level == SOL_UDPLITE)
1338 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1339 udp_v6_push_pending_frames);
1340 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1341 }
1342
1343 #ifdef CONFIG_COMPAT
1344 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1345 char __user *optval, unsigned int optlen)
1346 {
1347 if (level == SOL_UDP || level == SOL_UDPLITE)
1348 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1349 udp_v6_push_pending_frames);
1350 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1351 }
1352 #endif
1353
1354 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1355 char __user *optval, int __user *optlen)
1356 {
1357 if (level == SOL_UDP || level == SOL_UDPLITE)
1358 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1359 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1360 }
1361
1362 #ifdef CONFIG_COMPAT
1363 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1364 char __user *optval, int __user *optlen)
1365 {
1366 if (level == SOL_UDP || level == SOL_UDPLITE)
1367 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1368 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1369 }
1370 #endif
1371
1372 static const struct inet6_protocol udpv6_protocol = {
1373 .handler = udpv6_rcv,
1374 .err_handler = udpv6_err,
1375 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1376 };
1377
1378 /* ------------------------------------------------------------------------ */
1379 #ifdef CONFIG_PROC_FS
1380 int udp6_seq_show(struct seq_file *seq, void *v)
1381 {
1382 if (v == SEQ_START_TOKEN) {
1383 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1384 } else {
1385 int bucket = ((struct udp_iter_state *)seq->private)->bucket;
1386 struct inet_sock *inet = inet_sk(v);
1387 __u16 srcp = ntohs(inet->inet_sport);
1388 __u16 destp = ntohs(inet->inet_dport);
1389 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
1390 }
1391 return 0;
1392 }
1393
1394 static const struct file_operations udp6_afinfo_seq_fops = {
1395 .owner = THIS_MODULE,
1396 .open = udp_seq_open,
1397 .read = seq_read,
1398 .llseek = seq_lseek,
1399 .release = seq_release_net
1400 };
1401
1402 static struct udp_seq_afinfo udp6_seq_afinfo = {
1403 .name = "udp6",
1404 .family = AF_INET6,
1405 .udp_table = &udp_table,
1406 .seq_fops = &udp6_afinfo_seq_fops,
1407 .seq_ops = {
1408 .show = udp6_seq_show,
1409 },
1410 };
1411
1412 int __net_init udp6_proc_init(struct net *net)
1413 {
1414 return udp_proc_register(net, &udp6_seq_afinfo);
1415 }
1416
1417 void udp6_proc_exit(struct net *net) {
1418 udp_proc_unregister(net, &udp6_seq_afinfo);
1419 }
1420 #endif /* CONFIG_PROC_FS */
1421
1422 void udp_v6_clear_sk(struct sock *sk, int size)
1423 {
1424 struct inet_sock *inet = inet_sk(sk);
1425
1426 /* we do not want to clear pinet6 field, because of RCU lookups */
1427 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1428
1429 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1430 memset(&inet->pinet6 + 1, 0, size);
1431 }
1432
1433 /* ------------------------------------------------------------------------ */
1434
1435 struct proto udpv6_prot = {
1436 .name = "UDPv6",
1437 .owner = THIS_MODULE,
1438 .close = udp_lib_close,
1439 .connect = ip6_datagram_connect,
1440 .disconnect = udp_disconnect,
1441 .ioctl = udp_ioctl,
1442 .destroy = udpv6_destroy_sock,
1443 .setsockopt = udpv6_setsockopt,
1444 .getsockopt = udpv6_getsockopt,
1445 .sendmsg = udpv6_sendmsg,
1446 .recvmsg = udpv6_recvmsg,
1447 .backlog_rcv = __udpv6_queue_rcv_skb,
1448 .hash = udp_lib_hash,
1449 .unhash = udp_lib_unhash,
1450 .rehash = udp_v6_rehash,
1451 .get_port = udp_v6_get_port,
1452 .memory_allocated = &udp_memory_allocated,
1453 .sysctl_mem = sysctl_udp_mem,
1454 .sysctl_wmem = &sysctl_udp_wmem_min,
1455 .sysctl_rmem = &sysctl_udp_rmem_min,
1456 .obj_size = sizeof(struct udp6_sock),
1457 .slab_flags = SLAB_DESTROY_BY_RCU,
1458 .h.udp_table = &udp_table,
1459 #ifdef CONFIG_COMPAT
1460 .compat_setsockopt = compat_udpv6_setsockopt,
1461 .compat_getsockopt = compat_udpv6_getsockopt,
1462 #endif
1463 .clear_sk = udp_v6_clear_sk,
1464 };
1465
1466 static struct inet_protosw udpv6_protosw = {
1467 .type = SOCK_DGRAM,
1468 .protocol = IPPROTO_UDP,
1469 .prot = &udpv6_prot,
1470 .ops = &inet6_dgram_ops,
1471 .no_check = UDP_CSUM_DEFAULT,
1472 .flags = INET_PROTOSW_PERMANENT,
1473 };
1474
1475
1476 int __init udpv6_init(void)
1477 {
1478 int ret;
1479
1480 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1481 if (ret)
1482 goto out;
1483
1484 ret = inet6_register_protosw(&udpv6_protosw);
1485 if (ret)
1486 goto out_udpv6_protocol;
1487 out:
1488 return ret;
1489
1490 out_udpv6_protocol:
1491 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1492 goto out;
1493 }
1494
1495 void udpv6_exit(void)
1496 {
1497 inet6_unregister_protosw(&udpv6_protosw);
1498 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1499 }
Linux kernel - Deliverables
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