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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / udp.c
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1/*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/ipv6.h>
33#include <linux/icmpv6.h>
34#include <linux/init.h>
35#include <linux/module.h>
36#include <linux/skbuff.h>
37#include <linux/slab.h>
38#include <asm/uaccess.h>
39
40#include <net/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
50#include <linux/proc_fs.h>
51#include <linux/seq_file.h>
52#include <trace/events/skb.h>
53#include "udp_impl.h"
54
55int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
56{
57 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
58 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
59 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
60 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
61 int sk_ipv6only = ipv6_only_sock(sk);
62 int sk2_ipv6only = inet_v6_ipv6only(sk2);
63 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
64 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
65
66 /* if both are mapped, treat as IPv4 */
67 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
68 return (!sk2_ipv6only &&
69 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
70 sk1_rcv_saddr == sk2_rcv_saddr));
71
72 if (addr_type2 == IPV6_ADDR_ANY &&
73 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
74 return 1;
75
76 if (addr_type == IPV6_ADDR_ANY &&
77 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
78 return 1;
79
80 if (sk2_rcv_saddr6 &&
81 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
82 return 1;
83
84 return 0;
85}
86
87static unsigned int udp6_portaddr_hash(struct net *net,
88 const struct in6_addr *addr6,
89 unsigned int port)
90{
91 unsigned int hash, mix = net_hash_mix(net);
92
93 if (ipv6_addr_any(addr6))
94 hash = jhash_1word(0, mix);
95 else if (ipv6_addr_v4mapped(addr6))
96 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
97 else
98 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
99
100 return hash ^ port;
101}
102
103
104int udp_v6_get_port(struct sock *sk, unsigned short snum)
105{
106 unsigned int hash2_nulladdr =
107 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
108 unsigned int hash2_partial =
109 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
110
111 /* precompute partial secondary hash */
112 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
113 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
114}
115
116static void udp_v6_rehash(struct sock *sk)
117{
118 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
119 &inet6_sk(sk)->rcv_saddr,
120 inet_sk(sk)->inet_num);
121
122 udp_lib_rehash(sk, new_hash);
123}
124
125static inline int compute_score(struct sock *sk, struct net *net,
126 unsigned short hnum,
127 const struct in6_addr *saddr, __be16 sport,
128 const struct in6_addr *daddr, __be16 dport,
129 int dif)
130{
131 int score = -1;
132
133 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
134 sk->sk_family == PF_INET6) {
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct inet_sock *inet = inet_sk(sk);
137
138 score = 0;
139 if (inet->inet_dport) {
140 if (inet->inet_dport != sport)
141 return -1;
142 score++;
143 }
144 if (!ipv6_addr_any(&np->rcv_saddr)) {
145 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
146 return -1;
147 score++;
148 }
149 if (!ipv6_addr_any(&np->daddr)) {
150 if (!ipv6_addr_equal(&np->daddr, saddr))
151 return -1;
152 score++;
153 }
154 if (sk->sk_bound_dev_if) {
155 if (sk->sk_bound_dev_if != dif)
156 return -1;
157 score++;
158 }
159 }
160 return score;
161}
162
163#define SCORE2_MAX (1 + 1 + 1)
164static inline int compute_score2(struct sock *sk, struct net *net,
165 const struct in6_addr *saddr, __be16 sport,
166 const struct in6_addr *daddr, unsigned short hnum,
167 int dif)
168{
169 int score = -1;
170
171 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
172 sk->sk_family == PF_INET6) {
173 struct ipv6_pinfo *np = inet6_sk(sk);
174 struct inet_sock *inet = inet_sk(sk);
175
176 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
177 return -1;
178 score = 0;
179 if (inet->inet_dport) {
180 if (inet->inet_dport != sport)
181 return -1;
182 score++;
183 }
184 if (!ipv6_addr_any(&np->daddr)) {
185 if (!ipv6_addr_equal(&np->daddr, saddr))
186 return -1;
187 score++;
188 }
189 if (sk->sk_bound_dev_if) {
190 if (sk->sk_bound_dev_if != dif)
191 return -1;
192 score++;
193 }
194 }
195 return score;
196}
197
198
199/* called with read_rcu_lock() */
200static struct sock *udp6_lib_lookup2(struct net *net,
201 const struct in6_addr *saddr, __be16 sport,
202 const struct in6_addr *daddr, unsigned int hnum, int dif,
203 struct udp_hslot *hslot2, unsigned int slot2)
204{
205 struct sock *sk, *result;
206 struct hlist_nulls_node *node;
207 int score, badness, matches = 0, reuseport = 0;
208 u32 hash = 0;
209
210begin:
211 result = NULL;
212 badness = -1;
213 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
214 score = compute_score2(sk, net, saddr, sport,
215 daddr, hnum, dif);
216 if (score > badness) {
217 result = sk;
218 badness = score;
219 reuseport = sk->sk_reuseport;
220 if (reuseport) {
221 hash = inet6_ehashfn(net, daddr, hnum,
222 saddr, sport);
223 matches = 1;
224 } else if (score == SCORE2_MAX)
225 goto exact_match;
226 } else if (score == badness && reuseport) {
227 matches++;
228 if (((u64)hash * matches) >> 32 == 0)
229 result = sk;
230 hash = next_pseudo_random32(hash);
231 }
232 }
233 /*
234 * if the nulls value we got at the end of this lookup is
235 * not the expected one, we must restart lookup.
236 * We probably met an item that was moved to another chain.
237 */
238 if (get_nulls_value(node) != slot2)
239 goto begin;
240
241 if (result) {
242exact_match:
243 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
244 result = NULL;
245 else if (unlikely(compute_score2(result, net, saddr, sport,
246 daddr, hnum, dif) < badness)) {
247 sock_put(result);
248 goto begin;
249 }
250 }
251 return result;
252}
253
254struct sock *__udp6_lib_lookup(struct net *net,
255 const struct in6_addr *saddr, __be16 sport,
256 const struct in6_addr *daddr, __be16 dport,
257 int dif, struct udp_table *udptable)
258{
259 struct sock *sk, *result;
260 struct hlist_nulls_node *node;
261 unsigned short hnum = ntohs(dport);
262 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
263 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
264 int score, badness, matches = 0, reuseport = 0;
265 u32 hash = 0;
266
267 rcu_read_lock();
268 if (hslot->count > 10) {
269 hash2 = udp6_portaddr_hash(net, daddr, hnum);
270 slot2 = hash2 & udptable->mask;
271 hslot2 = &udptable->hash2[slot2];
272 if (hslot->count < hslot2->count)
273 goto begin;
274
275 result = udp6_lib_lookup2(net, saddr, sport,
276 daddr, hnum, dif,
277 hslot2, slot2);
278 if (!result) {
279 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
280 slot2 = hash2 & udptable->mask;
281 hslot2 = &udptable->hash2[slot2];
282 if (hslot->count < hslot2->count)
283 goto begin;
284
285 result = udp6_lib_lookup2(net, saddr, sport,
286 &in6addr_any, hnum, dif,
287 hslot2, slot2);
288 }
289 rcu_read_unlock();
290 return result;
291 }
292begin:
293 result = NULL;
294 badness = -1;
295 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
296 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
297 if (score > badness) {
298 result = sk;
299 badness = score;
300 reuseport = sk->sk_reuseport;
301 if (reuseport) {
302 hash = inet6_ehashfn(net, daddr, hnum,
303 saddr, sport);
304 matches = 1;
305 }
306 } else if (score == badness && reuseport) {
307 matches++;
308 if (((u64)hash * matches) >> 32 == 0)
309 result = sk;
310 hash = next_pseudo_random32(hash);
311 }
312 }
313 /*
314 * if the nulls value we got at the end of this lookup is
315 * not the expected one, we must restart lookup.
316 * We probably met an item that was moved to another chain.
317 */
318 if (get_nulls_value(node) != slot)
319 goto begin;
320
321 if (result) {
322 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
323 result = NULL;
324 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
325 daddr, dport, dif) < badness)) {
326 sock_put(result);
327 goto begin;
328 }
329 }
330 rcu_read_unlock();
331 return result;
332}
333EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
334
335static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
336 __be16 sport, __be16 dport,
337 struct udp_table *udptable)
338{
339 struct sock *sk;
340 const struct ipv6hdr *iph = ipv6_hdr(skb);
341
342 if (unlikely(sk = skb_steal_sock(skb)))
343 return sk;
344 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
345 &iph->daddr, dport, inet6_iif(skb),
346 udptable);
347}
348
349struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
350 const struct in6_addr *daddr, __be16 dport, int dif)
351{
352 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
353}
354EXPORT_SYMBOL_GPL(udp6_lib_lookup);
355
356
357/*
358 * This should be easy, if there is something there we
359 * return it, otherwise we block.
360 */
361
362int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
363 struct msghdr *msg, size_t len,
364 int noblock, int flags, int *addr_len)
365{
366 struct ipv6_pinfo *np = inet6_sk(sk);
367 struct inet_sock *inet = inet_sk(sk);
368 struct sk_buff *skb;
369 unsigned int ulen, copied;
370 int peeked, off = 0;
371 int err;
372 int is_udplite = IS_UDPLITE(sk);
373 bool checksum_valid = false;
374 int is_udp4;
375 bool slow;
376
377 if (flags & MSG_ERRQUEUE)
378 return ipv6_recv_error(sk, msg, len, addr_len);
379
380 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
381 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
382
383try_again:
384 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
385 &peeked, &off, &err);
386 if (!skb)
387 goto out;
388
389 ulen = skb->len - sizeof(struct udphdr);
390 copied = len;
391 if (copied > ulen)
392 copied = ulen;
393 else if (copied < ulen)
394 msg->msg_flags |= MSG_TRUNC;
395
396 is_udp4 = (skb->protocol == htons(ETH_P_IP));
397
398 /*
399 * If checksum is needed at all, try to do it while copying the
400 * data. If the data is truncated, or if we only want a partial
401 * coverage checksum (UDP-Lite), do it before the copy.
402 */
403
404 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
405 checksum_valid = !udp_lib_checksum_complete(skb);
406 if (!checksum_valid)
407 goto csum_copy_err;
408 }
409
410 if (checksum_valid || skb_csum_unnecessary(skb))
411 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
412 msg->msg_iov, copied);
413 else {
414 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
415 if (err == -EINVAL)
416 goto csum_copy_err;
417 }
418 if (unlikely(err)) {
419 trace_kfree_skb(skb, udpv6_recvmsg);
420 if (!peeked) {
421 atomic_inc(&sk->sk_drops);
422 if (is_udp4)
423 UDP_INC_STATS_USER(sock_net(sk),
424 UDP_MIB_INERRORS,
425 is_udplite);
426 else
427 UDP6_INC_STATS_USER(sock_net(sk),
428 UDP_MIB_INERRORS,
429 is_udplite);
430 }
431 goto out_free;
432 }
433 if (!peeked) {
434 if (is_udp4)
435 UDP_INC_STATS_USER(sock_net(sk),
436 UDP_MIB_INDATAGRAMS, is_udplite);
437 else
438 UDP6_INC_STATS_USER(sock_net(sk),
439 UDP_MIB_INDATAGRAMS, is_udplite);
440 }
441
442 sock_recv_ts_and_drops(msg, sk, skb);
443
444 /* Copy the address. */
445 if (msg->msg_name) {
446 struct sockaddr_in6 *sin6;
447
448 sin6 = (struct sockaddr_in6 *) msg->msg_name;
449 sin6->sin6_family = AF_INET6;
450 sin6->sin6_port = udp_hdr(skb)->source;
451 sin6->sin6_flowinfo = 0;
452
453 if (is_udp4) {
454 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
455 &sin6->sin6_addr);
456 sin6->sin6_scope_id = 0;
457 } else {
458 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
459 sin6->sin6_scope_id =
460 ipv6_iface_scope_id(&sin6->sin6_addr,
461 IP6CB(skb)->iif);
462 }
463 *addr_len = sizeof(*sin6);
464 }
465 if (is_udp4) {
466 if (inet->cmsg_flags)
467 ip_cmsg_recv(msg, skb);
468 } else {
469 if (np->rxopt.all)
470 ip6_datagram_recv_ctl(sk, msg, skb);
471 }
472
473 err = copied;
474 if (flags & MSG_TRUNC)
475 err = ulen;
476
477out_free:
478 skb_free_datagram_locked(sk, skb);
479out:
480 return err;
481
482csum_copy_err:
483 slow = lock_sock_fast(sk);
484 if (!skb_kill_datagram(sk, skb, flags)) {
485 if (is_udp4) {
486 UDP_INC_STATS_USER(sock_net(sk),
487 UDP_MIB_CSUMERRORS, is_udplite);
488 UDP_INC_STATS_USER(sock_net(sk),
489 UDP_MIB_INERRORS, is_udplite);
490 } else {
491 UDP6_INC_STATS_USER(sock_net(sk),
492 UDP_MIB_CSUMERRORS, is_udplite);
493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_INERRORS, is_udplite);
495 }
496 }
497 unlock_sock_fast(sk, slow);
498
499 /* starting over for a new packet, but check if we need to yield */
500 cond_resched();
501 msg->msg_flags &= ~MSG_TRUNC;
502 goto try_again;
503}
504
505void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
506 u8 type, u8 code, int offset, __be32 info,
507 struct udp_table *udptable)
508{
509 struct ipv6_pinfo *np;
510 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
511 const struct in6_addr *saddr = &hdr->saddr;
512 const struct in6_addr *daddr = &hdr->daddr;
513 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
514 struct sock *sk;
515 int err;
516
517 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
518 saddr, uh->source, inet6_iif(skb), udptable);
519 if (sk == NULL)
520 return;
521
522 if (type == ICMPV6_PKT_TOOBIG)
523 ip6_sk_update_pmtu(skb, sk, info);
524 if (type == NDISC_REDIRECT)
525 ip6_sk_redirect(skb, sk);
526
527 np = inet6_sk(sk);
528
529 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
530 goto out;
531
532 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
533 goto out;
534
535 if (np->recverr)
536 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
537
538 sk->sk_err = err;
539 sk->sk_error_report(sk);
540out:
541 sock_put(sk);
542}
543
544static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
545{
546 int rc;
547
548 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
549 sock_rps_save_rxhash(sk, skb);
550
551 rc = sock_queue_rcv_skb(sk, skb);
552 if (rc < 0) {
553 int is_udplite = IS_UDPLITE(sk);
554
555 /* Note that an ENOMEM error is charged twice */
556 if (rc == -ENOMEM)
557 UDP6_INC_STATS_BH(sock_net(sk),
558 UDP_MIB_RCVBUFERRORS, is_udplite);
559 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
560 kfree_skb(skb);
561 return -1;
562 }
563 return 0;
564}
565
566static __inline__ void udpv6_err(struct sk_buff *skb,
567 struct inet6_skb_parm *opt, u8 type,
568 u8 code, int offset, __be32 info )
569{
570 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
571}
572
573static struct static_key udpv6_encap_needed __read_mostly;
574void udpv6_encap_enable(void)
575{
576 if (!static_key_enabled(&udpv6_encap_needed))
577 static_key_slow_inc(&udpv6_encap_needed);
578}
579EXPORT_SYMBOL(udpv6_encap_enable);
580
581int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
582{
583 struct udp_sock *up = udp_sk(sk);
584 int rc;
585 int is_udplite = IS_UDPLITE(sk);
586
587 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
588 goto drop;
589
590 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
591 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
592
593 /*
594 * This is an encapsulation socket so pass the skb to
595 * the socket's udp_encap_rcv() hook. Otherwise, just
596 * fall through and pass this up the UDP socket.
597 * up->encap_rcv() returns the following value:
598 * =0 if skb was successfully passed to the encap
599 * handler or was discarded by it.
600 * >0 if skb should be passed on to UDP.
601 * <0 if skb should be resubmitted as proto -N
602 */
603
604 /* if we're overly short, let UDP handle it */
605 encap_rcv = ACCESS_ONCE(up->encap_rcv);
606 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
607 int ret;
608
609 ret = encap_rcv(sk, skb);
610 if (ret <= 0) {
611 UDP_INC_STATS_BH(sock_net(sk),
612 UDP_MIB_INDATAGRAMS,
613 is_udplite);
614 return -ret;
615 }
616 }
617
618 /* FALLTHROUGH -- it's a UDP Packet */
619 }
620
621 /*
622 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
623 */
624 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
625
626 if (up->pcrlen == 0) { /* full coverage was set */
627 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
628 " %d while full coverage %d requested\n",
629 UDP_SKB_CB(skb)->cscov, skb->len);
630 goto drop;
631 }
632 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
633 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
634 "too small, need min %d\n",
635 UDP_SKB_CB(skb)->cscov, up->pcrlen);
636 goto drop;
637 }
638 }
639
640 if (rcu_access_pointer(sk->sk_filter)) {
641 if (udp_lib_checksum_complete(skb))
642 goto csum_error;
643 }
644
645 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
646 goto drop;
647
648 skb_dst_drop(skb);
649
650 bh_lock_sock(sk);
651 rc = 0;
652 if (!sock_owned_by_user(sk))
653 rc = __udpv6_queue_rcv_skb(sk, skb);
654 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
655 bh_unlock_sock(sk);
656 goto drop;
657 }
658 bh_unlock_sock(sk);
659
660 return rc;
661csum_error:
662 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
663drop:
664 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
665 atomic_inc(&sk->sk_drops);
666 kfree_skb(skb);
667 return -1;
668}
669
670static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
671 __be16 loc_port, const struct in6_addr *loc_addr,
672 __be16 rmt_port, const struct in6_addr *rmt_addr,
673 int dif)
674{
675 struct hlist_nulls_node *node;
676 struct sock *s = sk;
677 unsigned short num = ntohs(loc_port);
678
679 sk_nulls_for_each_from(s, node) {
680 struct inet_sock *inet = inet_sk(s);
681
682 if (!net_eq(sock_net(s), net))
683 continue;
684
685 if (udp_sk(s)->udp_port_hash == num &&
686 s->sk_family == PF_INET6) {
687 struct ipv6_pinfo *np = inet6_sk(s);
688 if (inet->inet_dport) {
689 if (inet->inet_dport != rmt_port)
690 continue;
691 }
692 if (!ipv6_addr_any(&np->daddr) &&
693 !ipv6_addr_equal(&np->daddr, rmt_addr))
694 continue;
695
696 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
697 continue;
698
699 if (!ipv6_addr_any(&np->rcv_saddr)) {
700 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
701 continue;
702 }
703 if (!inet6_mc_check(s, loc_addr, rmt_addr))
704 continue;
705 return s;
706 }
707 }
708 return NULL;
709}
710
711static void flush_stack(struct sock **stack, unsigned int count,
712 struct sk_buff *skb, unsigned int final)
713{
714 struct sk_buff *skb1 = NULL;
715 struct sock *sk;
716 unsigned int i;
717
718 for (i = 0; i < count; i++) {
719 sk = stack[i];
720 if (likely(skb1 == NULL))
721 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
722 if (!skb1) {
723 atomic_inc(&sk->sk_drops);
724 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
725 IS_UDPLITE(sk));
726 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
727 IS_UDPLITE(sk));
728 }
729
730 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
731 skb1 = NULL;
732 }
733 if (unlikely(skb1))
734 kfree_skb(skb1);
735}
736/*
737 * Note: called only from the BH handler context,
738 * so we don't need to lock the hashes.
739 */
740static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
741 const struct in6_addr *saddr, const struct in6_addr *daddr,
742 struct udp_table *udptable)
743{
744 struct sock *sk, *stack[256 / sizeof(struct sock *)];
745 const struct udphdr *uh = udp_hdr(skb);
746 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
747 int dif;
748 unsigned int i, count = 0;
749
750 spin_lock(&hslot->lock);
751 sk = sk_nulls_head(&hslot->head);
752 dif = inet6_iif(skb);
753 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
754 while (sk) {
755 stack[count++] = sk;
756 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
757 uh->source, saddr, dif);
758 if (unlikely(count == ARRAY_SIZE(stack))) {
759 if (!sk)
760 break;
761 flush_stack(stack, count, skb, ~0);
762 count = 0;
763 }
764 }
765 /*
766 * before releasing the lock, we must take reference on sockets
767 */
768 for (i = 0; i < count; i++)
769 sock_hold(stack[i]);
770
771 spin_unlock(&hslot->lock);
772
773 if (count) {
774 flush_stack(stack, count, skb, count - 1);
775
776 for (i = 0; i < count; i++)
777 sock_put(stack[i]);
778 } else {
779 kfree_skb(skb);
780 }
781 return 0;
782}
783
784int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
785 int proto)
786{
787 struct net *net = dev_net(skb->dev);
788 struct sock *sk;
789 struct udphdr *uh;
790 const struct in6_addr *saddr, *daddr;
791 u32 ulen = 0;
792
793 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
794 goto discard;
795
796 saddr = &ipv6_hdr(skb)->saddr;
797 daddr = &ipv6_hdr(skb)->daddr;
798 uh = udp_hdr(skb);
799
800 ulen = ntohs(uh->len);
801 if (ulen > skb->len)
802 goto short_packet;
803
804 if (proto == IPPROTO_UDP) {
805 /* UDP validates ulen. */
806
807 /* Check for jumbo payload */
808 if (ulen == 0)
809 ulen = skb->len;
810
811 if (ulen < sizeof(*uh))
812 goto short_packet;
813
814 if (ulen < skb->len) {
815 if (pskb_trim_rcsum(skb, ulen))
816 goto short_packet;
817 saddr = &ipv6_hdr(skb)->saddr;
818 daddr = &ipv6_hdr(skb)->daddr;
819 uh = udp_hdr(skb);
820 }
821 }
822
823 if (udp6_csum_init(skb, uh, proto))
824 goto csum_error;
825
826 /*
827 * Multicast receive code
828 */
829 if (ipv6_addr_is_multicast(daddr))
830 return __udp6_lib_mcast_deliver(net, skb,
831 saddr, daddr, udptable);
832
833 /* Unicast */
834
835 /*
836 * check socket cache ... must talk to Alan about his plans
837 * for sock caches... i'll skip this for now.
838 */
839 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
840 if (sk != NULL) {
841 int ret = udpv6_queue_rcv_skb(sk, skb);
842 sock_put(sk);
843
844 /* a return value > 0 means to resubmit the input */
845 if (ret > 0)
846 return ret;
847
848 return 0;
849 }
850
851 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
852 goto discard;
853
854 if (udp_lib_checksum_complete(skb))
855 goto csum_error;
856
857 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
858 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
859
860 kfree_skb(skb);
861 return 0;
862
863short_packet:
864 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
865 proto == IPPROTO_UDPLITE ? "-Lite" : "",
866 saddr,
867 ntohs(uh->source),
868 ulen,
869 skb->len,
870 daddr,
871 ntohs(uh->dest));
872 goto discard;
873csum_error:
874 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
875discard:
876 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
877 kfree_skb(skb);
878 return 0;
879}
880
881static __inline__ int udpv6_rcv(struct sk_buff *skb)
882{
883 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
884}
885
886/*
887 * Throw away all pending data and cancel the corking. Socket is locked.
888 */
889static void udp_v6_flush_pending_frames(struct sock *sk)
890{
891 struct udp_sock *up = udp_sk(sk);
892
893 if (up->pending == AF_INET)
894 udp_flush_pending_frames(sk);
895 else if (up->pending) {
896 up->len = 0;
897 up->pending = 0;
898 ip6_flush_pending_frames(sk);
899 }
900}
901
902/**
903 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
904 * @sk: socket we are sending on
905 * @skb: sk_buff containing the filled-in UDP header
906 * (checksum field must be zeroed out)
907 */
908static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
909 const struct in6_addr *saddr,
910 const struct in6_addr *daddr, int len)
911{
912 unsigned int offset;
913 struct udphdr *uh = udp_hdr(skb);
914 __wsum csum = 0;
915
916 if (skb_queue_len(&sk->sk_write_queue) == 1) {
917 /* Only one fragment on the socket. */
918 skb->csum_start = skb_transport_header(skb) - skb->head;
919 skb->csum_offset = offsetof(struct udphdr, check);
920 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
921 } else {
922 /*
923 * HW-checksum won't work as there are two or more
924 * fragments on the socket so that all csums of sk_buffs
925 * should be together
926 */
927 offset = skb_transport_offset(skb);
928 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
929
930 skb->ip_summed = CHECKSUM_NONE;
931
932 skb_queue_walk(&sk->sk_write_queue, skb) {
933 csum = csum_add(csum, skb->csum);
934 }
935
936 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
937 csum);
938 if (uh->check == 0)
939 uh->check = CSUM_MANGLED_0;
940 }
941}
942
943/*
944 * Sending
945 */
946
947static int udp_v6_push_pending_frames(struct sock *sk)
948{
949 struct sk_buff *skb;
950 struct udphdr *uh;
951 struct udp_sock *up = udp_sk(sk);
952 struct inet_sock *inet = inet_sk(sk);
953 struct flowi6 *fl6;
954 int err = 0;
955 int is_udplite = IS_UDPLITE(sk);
956 __wsum csum = 0;
957
958 if (up->pending == AF_INET)
959 return udp_push_pending_frames(sk);
960
961 fl6 = &inet->cork.fl.u.ip6;
962
963 /* Grab the skbuff where UDP header space exists. */
964 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
965 goto out;
966
967 /*
968 * Create a UDP header
969 */
970 uh = udp_hdr(skb);
971 uh->source = fl6->fl6_sport;
972 uh->dest = fl6->fl6_dport;
973 uh->len = htons(up->len);
974 uh->check = 0;
975
976 if (is_udplite)
977 csum = udplite_csum_outgoing(sk, skb);
978 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
979 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
980 up->len);
981 goto send;
982 } else
983 csum = udp_csum_outgoing(sk, skb);
984
985 /* add protocol-dependent pseudo-header */
986 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
987 up->len, fl6->flowi6_proto, csum);
988 if (uh->check == 0)
989 uh->check = CSUM_MANGLED_0;
990
991send:
992 err = ip6_push_pending_frames(sk);
993 if (err) {
994 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
995 UDP6_INC_STATS_USER(sock_net(sk),
996 UDP_MIB_SNDBUFERRORS, is_udplite);
997 err = 0;
998 }
999 } else
1000 UDP6_INC_STATS_USER(sock_net(sk),
1001 UDP_MIB_OUTDATAGRAMS, is_udplite);
1002out:
1003 up->len = 0;
1004 up->pending = 0;
1005 return err;
1006}
1007
1008int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1009 struct msghdr *msg, size_t len)
1010{
1011 struct ipv6_txoptions opt_space;
1012 struct udp_sock *up = udp_sk(sk);
1013 struct inet_sock *inet = inet_sk(sk);
1014 struct ipv6_pinfo *np = inet6_sk(sk);
1015 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1016 struct in6_addr *daddr, *final_p, final;
1017 struct ipv6_txoptions *opt = NULL;
1018 struct ip6_flowlabel *flowlabel = NULL;
1019 struct flowi6 fl6;
1020 struct dst_entry *dst;
1021 int addr_len = msg->msg_namelen;
1022 int ulen = len;
1023 int hlimit = -1;
1024 int tclass = -1;
1025 int dontfrag = -1;
1026 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1027 int err;
1028 int connected = 0;
1029 int is_udplite = IS_UDPLITE(sk);
1030 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1031
1032 /* destination address check */
1033 if (sin6) {
1034 if (addr_len < offsetof(struct sockaddr, sa_data))
1035 return -EINVAL;
1036
1037 switch (sin6->sin6_family) {
1038 case AF_INET6:
1039 if (addr_len < SIN6_LEN_RFC2133)
1040 return -EINVAL;
1041 daddr = &sin6->sin6_addr;
1042 break;
1043 case AF_INET:
1044 goto do_udp_sendmsg;
1045 case AF_UNSPEC:
1046 msg->msg_name = sin6 = NULL;
1047 msg->msg_namelen = addr_len = 0;
1048 daddr = NULL;
1049 break;
1050 default:
1051 return -EINVAL;
1052 }
1053 } else if (!up->pending) {
1054 if (sk->sk_state != TCP_ESTABLISHED)
1055 return -EDESTADDRREQ;
1056 daddr = &np->daddr;
1057 } else
1058 daddr = NULL;
1059
1060 if (daddr) {
1061 if (ipv6_addr_v4mapped(daddr)) {
1062 struct sockaddr_in sin;
1063 sin.sin_family = AF_INET;
1064 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1065 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1066 msg->msg_name = &sin;
1067 msg->msg_namelen = sizeof(sin);
1068do_udp_sendmsg:
1069 if (__ipv6_only_sock(sk))
1070 return -ENETUNREACH;
1071 return udp_sendmsg(iocb, sk, msg, len);
1072 }
1073 }
1074
1075 if (up->pending == AF_INET)
1076 return udp_sendmsg(iocb, sk, msg, len);
1077
1078 /* Rough check on arithmetic overflow,
1079 better check is made in ip6_append_data().
1080 */
1081 if (len > INT_MAX - sizeof(struct udphdr))
1082 return -EMSGSIZE;
1083
1084 if (up->pending) {
1085 /*
1086 * There are pending frames.
1087 * The socket lock must be held while it's corked.
1088 */
1089 lock_sock(sk);
1090 if (likely(up->pending)) {
1091 if (unlikely(up->pending != AF_INET6)) {
1092 release_sock(sk);
1093 return -EAFNOSUPPORT;
1094 }
1095 dst = NULL;
1096 goto do_append_data;
1097 }
1098 release_sock(sk);
1099 }
1100 ulen += sizeof(struct udphdr);
1101
1102 memset(&fl6, 0, sizeof(fl6));
1103
1104 if (sin6) {
1105 if (sin6->sin6_port == 0)
1106 return -EINVAL;
1107
1108 fl6.fl6_dport = sin6->sin6_port;
1109 daddr = &sin6->sin6_addr;
1110
1111 if (np->sndflow) {
1112 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1113 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1114 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1115 if (flowlabel == NULL)
1116 return -EINVAL;
1117 daddr = &flowlabel->dst;
1118 }
1119 }
1120
1121 /*
1122 * Otherwise it will be difficult to maintain
1123 * sk->sk_dst_cache.
1124 */
1125 if (sk->sk_state == TCP_ESTABLISHED &&
1126 ipv6_addr_equal(daddr, &np->daddr))
1127 daddr = &np->daddr;
1128
1129 if (addr_len >= sizeof(struct sockaddr_in6) &&
1130 sin6->sin6_scope_id &&
1131 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1132 fl6.flowi6_oif = sin6->sin6_scope_id;
1133 } else {
1134 if (sk->sk_state != TCP_ESTABLISHED)
1135 return -EDESTADDRREQ;
1136
1137 fl6.fl6_dport = inet->inet_dport;
1138 daddr = &np->daddr;
1139 fl6.flowlabel = np->flow_label;
1140 connected = 1;
1141 }
1142
1143 if (!fl6.flowi6_oif)
1144 fl6.flowi6_oif = sk->sk_bound_dev_if;
1145
1146 if (!fl6.flowi6_oif)
1147 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1148
1149 fl6.flowi6_mark = sk->sk_mark;
1150 fl6.flowi6_uid = sock_i_uid(sk);
1151
1152 if (msg->msg_controllen) {
1153 opt = &opt_space;
1154 memset(opt, 0, sizeof(struct ipv6_txoptions));
1155 opt->tot_len = sizeof(*opt);
1156
1157 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1158 &hlimit, &tclass, &dontfrag);
1159 if (err < 0) {
1160 fl6_sock_release(flowlabel);
1161 return err;
1162 }
1163 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1164 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1165 if (flowlabel == NULL)
1166 return -EINVAL;
1167 }
1168 if (!(opt->opt_nflen|opt->opt_flen))
1169 opt = NULL;
1170 connected = 0;
1171 }
1172 if (opt == NULL)
1173 opt = np->opt;
1174 if (flowlabel)
1175 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1176 opt = ipv6_fixup_options(&opt_space, opt);
1177
1178 fl6.flowi6_proto = sk->sk_protocol;
1179 if (!ipv6_addr_any(daddr))
1180 fl6.daddr = *daddr;
1181 else
1182 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1183 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1184 fl6.saddr = np->saddr;
1185 fl6.fl6_sport = inet->inet_sport;
1186
1187 final_p = fl6_update_dst(&fl6, opt, &final);
1188 if (final_p)
1189 connected = 0;
1190
1191 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1192 fl6.flowi6_oif = np->mcast_oif;
1193 connected = 0;
1194 } else if (!fl6.flowi6_oif)
1195 fl6.flowi6_oif = np->ucast_oif;
1196
1197 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1198
1199 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1200 if (IS_ERR(dst)) {
1201 err = PTR_ERR(dst);
1202 dst = NULL;
1203 goto out;
1204 }
1205
1206 if (hlimit < 0) {
1207 if (ipv6_addr_is_multicast(&fl6.daddr))
1208 hlimit = np->mcast_hops;
1209 else
1210 hlimit = np->hop_limit;
1211 if (hlimit < 0)
1212 hlimit = ip6_dst_hoplimit(dst);
1213 }
1214
1215 if (tclass < 0)
1216 tclass = np->tclass;
1217
1218 if (dontfrag < 0)
1219 dontfrag = np->dontfrag;
1220
1221 if (msg->msg_flags&MSG_CONFIRM)
1222 goto do_confirm;
1223back_from_confirm:
1224
1225 lock_sock(sk);
1226 if (unlikely(up->pending)) {
1227 /* The socket is already corked while preparing it. */
1228 /* ... which is an evident application bug. --ANK */
1229 release_sock(sk);
1230
1231 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1232 err = -EINVAL;
1233 goto out;
1234 }
1235
1236 up->pending = AF_INET6;
1237
1238do_append_data:
1239 up->len += ulen;
1240 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1241 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1242 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1243 (struct rt6_info*)dst,
1244 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1245 if (err)
1246 udp_v6_flush_pending_frames(sk);
1247 else if (!corkreq)
1248 err = udp_v6_push_pending_frames(sk);
1249 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1250 up->pending = 0;
1251
1252 if (dst) {
1253 if (connected) {
1254 ip6_dst_store(sk, dst,
1255 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1256 &np->daddr : NULL,
1257#ifdef CONFIG_IPV6_SUBTREES
1258 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1259 &np->saddr :
1260#endif
1261 NULL);
1262 } else {
1263 dst_release(dst);
1264 }
1265 dst = NULL;
1266 }
1267
1268 if (err > 0)
1269 err = np->recverr ? net_xmit_errno(err) : 0;
1270 release_sock(sk);
1271out:
1272 dst_release(dst);
1273 fl6_sock_release(flowlabel);
1274 if (!err)
1275 return len;
1276 /*
1277 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1278 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1279 * we don't have a good statistic (IpOutDiscards but it can be too many
1280 * things). We could add another new stat but at least for now that
1281 * seems like overkill.
1282 */
1283 /* MTK_NET */
1284 if (err == -ENOBUFS || (sk->sk_socket && test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) ) {
1285 UDP6_INC_STATS_USER(sock_net(sk),
1286 UDP_MIB_SNDBUFERRORS, is_udplite);
1287 }
1288 return err;
1289
1290do_confirm:
1291 dst_confirm(dst);
1292 if (!(msg->msg_flags&MSG_PROBE) || len)
1293 goto back_from_confirm;
1294 err = 0;
1295 goto out;
1296}
1297
1298void udpv6_destroy_sock(struct sock *sk)
1299{
1300 struct udp_sock *up = udp_sk(sk);
1301 lock_sock(sk);
1302 udp_v6_flush_pending_frames(sk);
1303 release_sock(sk);
1304
1305 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1306 void (*encap_destroy)(struct sock *sk);
1307 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1308 if (encap_destroy)
1309 encap_destroy(sk);
1310 }
1311
1312 inet6_destroy_sock(sk);
1313}
1314
1315/*
1316 * Socket option code for UDP
1317 */
1318int udpv6_setsockopt(struct sock *sk, int level, int optname,
1319 char __user *optval, unsigned int optlen)
1320{
1321 if (level == SOL_UDP || level == SOL_UDPLITE)
1322 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1323 udp_v6_push_pending_frames);
1324 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1325}
1326
1327#ifdef CONFIG_COMPAT
1328int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1329 char __user *optval, unsigned int optlen)
1330{
1331 if (level == SOL_UDP || level == SOL_UDPLITE)
1332 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1333 udp_v6_push_pending_frames);
1334 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1335}
1336#endif
1337
1338int udpv6_getsockopt(struct sock *sk, int level, int optname,
1339 char __user *optval, int __user *optlen)
1340{
1341 if (level == SOL_UDP || level == SOL_UDPLITE)
1342 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1343 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1344}
1345
1346#ifdef CONFIG_COMPAT
1347int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1348 char __user *optval, int __user *optlen)
1349{
1350 if (level == SOL_UDP || level == SOL_UDPLITE)
1351 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1352 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1353}
1354#endif
1355
1356static const struct inet6_protocol udpv6_protocol = {
1357 .handler = udpv6_rcv,
1358 .err_handler = udpv6_err,
1359 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1360};
1361
1362/* ------------------------------------------------------------------------ */
1363#ifdef CONFIG_PROC_FS
1364
1365static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1366{
1367 struct inet_sock *inet = inet_sk(sp);
1368 struct ipv6_pinfo *np = inet6_sk(sp);
1369 const struct in6_addr *dest, *src;
1370 __u16 destp, srcp;
1371
1372 dest = &np->daddr;
1373 src = &np->rcv_saddr;
1374 destp = ntohs(inet->inet_dport);
1375 srcp = ntohs(inet->inet_sport);
1376 seq_printf(seq,
1377 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1378 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1379 bucket,
1380 src->s6_addr32[0], src->s6_addr32[1],
1381 src->s6_addr32[2], src->s6_addr32[3], srcp,
1382 dest->s6_addr32[0], dest->s6_addr32[1],
1383 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1384 sp->sk_state,
1385 sk_wmem_alloc_get(sp),
1386 sk_rmem_alloc_get(sp),
1387 0, 0L, 0,
1388 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1389 0,
1390 sock_i_ino(sp),
1391 atomic_read(&sp->sk_refcnt), sp,
1392 atomic_read(&sp->sk_drops));
1393}
1394
1395int udp6_seq_show(struct seq_file *seq, void *v)
1396{
1397 if (v == SEQ_START_TOKEN)
1398 seq_printf(seq,
1399 " sl "
1400 "local_address "
1401 "remote_address "
1402 "st tx_queue rx_queue tr tm->when retrnsmt"
1403 " uid timeout inode ref pointer drops\n");
1404 else
1405 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1406 return 0;
1407}
1408
1409static const struct file_operations udp6_afinfo_seq_fops = {
1410 .owner = THIS_MODULE,
1411 .open = udp_seq_open,
1412 .read = seq_read,
1413 .llseek = seq_lseek,
1414 .release = seq_release_net
1415};
1416
1417static struct udp_seq_afinfo udp6_seq_afinfo = {
1418 .name = "udp6",
1419 .family = AF_INET6,
1420 .udp_table = &udp_table,
1421 .seq_fops = &udp6_afinfo_seq_fops,
1422 .seq_ops = {
1423 .show = udp6_seq_show,
1424 },
1425};
1426
1427int __net_init udp6_proc_init(struct net *net)
1428{
1429 return udp_proc_register(net, &udp6_seq_afinfo);
1430}
1431
1432void udp6_proc_exit(struct net *net) {
1433 udp_proc_unregister(net, &udp6_seq_afinfo);
1434}
1435#endif /* CONFIG_PROC_FS */
1436
1437void udp_v6_clear_sk(struct sock *sk, int size)
1438{
1439 struct inet_sock *inet = inet_sk(sk);
1440
1441 /* we do not want to clear pinet6 field, because of RCU lookups */
1442 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1443
1444 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1445 memset(&inet->pinet6 + 1, 0, size);
1446}
1447
1448/* ------------------------------------------------------------------------ */
1449
1450struct proto udpv6_prot = {
1451 .name = "UDPv6",
1452 .owner = THIS_MODULE,
1453 .close = udp_lib_close,
1454 .connect = ip6_datagram_connect,
1455 .disconnect = udp_disconnect,
1456 .ioctl = udp_ioctl,
1457 .destroy = udpv6_destroy_sock,
1458 .setsockopt = udpv6_setsockopt,
1459 .getsockopt = udpv6_getsockopt,
1460 .sendmsg = udpv6_sendmsg,
1461 .recvmsg = udpv6_recvmsg,
1462 .backlog_rcv = __udpv6_queue_rcv_skb,
1463 .hash = udp_lib_hash,
1464 .unhash = udp_lib_unhash,
1465 .rehash = udp_v6_rehash,
1466 .get_port = udp_v6_get_port,
1467 .memory_allocated = &udp_memory_allocated,
1468 .sysctl_mem = sysctl_udp_mem,
1469 .sysctl_wmem = &sysctl_udp_wmem_min,
1470 .sysctl_rmem = &sysctl_udp_rmem_min,
1471 .obj_size = sizeof(struct udp6_sock),
1472 .slab_flags = SLAB_DESTROY_BY_RCU,
1473 .h.udp_table = &udp_table,
1474#ifdef CONFIG_COMPAT
1475 .compat_setsockopt = compat_udpv6_setsockopt,
1476 .compat_getsockopt = compat_udpv6_getsockopt,
1477#endif
1478 .clear_sk = udp_v6_clear_sk,
1479};
1480
1481static struct inet_protosw udpv6_protosw = {
1482 .type = SOCK_DGRAM,
1483 .protocol = IPPROTO_UDP,
1484 .prot = &udpv6_prot,
1485 .ops = &inet6_dgram_ops,
1486 .no_check = UDP_CSUM_DEFAULT,
1487 .flags = INET_PROTOSW_PERMANENT,
1488};
1489
1490
1491int __init udpv6_init(void)
1492{
1493 int ret;
1494
1495 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1496 if (ret)
1497 goto out;
1498
1499 ret = inet6_register_protosw(&udpv6_protosw);
1500 if (ret)
1501 goto out_udpv6_protocol;
1502out:
1503 return ret;
1504
1505out_udpv6_protocol:
1506 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1507 goto out;
1508}
1509
1510void udpv6_exit(void)
1511{
1512 inet6_unregister_protosw(&udpv6_protosw);
1513 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1514}
kernel source for telekom puls (alcatel/mediatek)