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import PULS_20180308
[GitHub/mt8127/android_kernel_alcatel_ttab.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
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <trace/events/skb.h>
53 #include "udp_impl.h"
54
55 int 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
87 static 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
104 int 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
116 static 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
125 static 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)
164 static 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() */
200 static 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
210 begin:
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) {
242 exact_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
254 struct 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 }
292 begin:
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 }
333 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
334
335 static 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
349 struct 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 }
354 EXPORT_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
362 int 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
383 try_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
477 out_free:
478 skb_free_datagram_locked(sk, skb);
479 out:
480 return err;
481
482 csum_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
505 void __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);
540 out:
541 sock_put(sk);
542 }
543
544 static 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
566 static __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
573 static struct static_key udpv6_encap_needed __read_mostly;
574 void udpv6_encap_enable(void)
575 {
576 if (!static_key_enabled(&udpv6_encap_needed))
577 static_key_slow_inc(&udpv6_encap_needed);
578 }
579 EXPORT_SYMBOL(udpv6_encap_enable);
580
581 int 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;
661 csum_error:
662 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
663 drop:
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
670 static 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
711 static 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 */
740 static 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
784 int __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, but
845 * it wants the return to be -protocol, or 0
846 */
847 if (ret > 0)
848 return -ret;
849
850 return 0;
851 }
852
853 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
854 goto discard;
855
856 if (udp_lib_checksum_complete(skb))
857 goto csum_error;
858
859 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
860 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
861
862 kfree_skb(skb);
863 return 0;
864
865 short_packet:
866 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
867 proto == IPPROTO_UDPLITE ? "-Lite" : "",
868 saddr,
869 ntohs(uh->source),
870 ulen,
871 skb->len,
872 daddr,
873 ntohs(uh->dest));
874 goto discard;
875 csum_error:
876 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
877 discard:
878 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
879 kfree_skb(skb);
880 return 0;
881 }
882
883 static __inline__ int udpv6_rcv(struct sk_buff *skb)
884 {
885 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
886 }
887
888 /*
889 * Throw away all pending data and cancel the corking. Socket is locked.
890 */
891 static void udp_v6_flush_pending_frames(struct sock *sk)
892 {
893 struct udp_sock *up = udp_sk(sk);
894
895 if (up->pending == AF_INET)
896 udp_flush_pending_frames(sk);
897 else if (up->pending) {
898 up->len = 0;
899 up->pending = 0;
900 ip6_flush_pending_frames(sk);
901 }
902 }
903
904 /**
905 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
906 * @sk: socket we are sending on
907 * @skb: sk_buff containing the filled-in UDP header
908 * (checksum field must be zeroed out)
909 */
910 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
911 const struct in6_addr *saddr,
912 const struct in6_addr *daddr, int len)
913 {
914 unsigned int offset;
915 struct udphdr *uh = udp_hdr(skb);
916 __wsum csum = 0;
917
918 if (skb_queue_len(&sk->sk_write_queue) == 1) {
919 /* Only one fragment on the socket. */
920 skb->csum_start = skb_transport_header(skb) - skb->head;
921 skb->csum_offset = offsetof(struct udphdr, check);
922 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
923 } else {
924 /*
925 * HW-checksum won't work as there are two or more
926 * fragments on the socket so that all csums of sk_buffs
927 * should be together
928 */
929 offset = skb_transport_offset(skb);
930 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
931
932 skb->ip_summed = CHECKSUM_NONE;
933
934 skb_queue_walk(&sk->sk_write_queue, skb) {
935 csum = csum_add(csum, skb->csum);
936 }
937
938 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
939 csum);
940 if (uh->check == 0)
941 uh->check = CSUM_MANGLED_0;
942 }
943 }
944
945 /*
946 * Sending
947 */
948
949 static int udp_v6_push_pending_frames(struct sock *sk)
950 {
951 struct sk_buff *skb;
952 struct udphdr *uh;
953 struct udp_sock *up = udp_sk(sk);
954 struct inet_sock *inet = inet_sk(sk);
955 struct flowi6 *fl6;
956 int err = 0;
957 int is_udplite = IS_UDPLITE(sk);
958 __wsum csum = 0;
959
960 if (up->pending == AF_INET)
961 return udp_push_pending_frames(sk);
962
963 fl6 = &inet->cork.fl.u.ip6;
964
965 /* Grab the skbuff where UDP header space exists. */
966 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
967 goto out;
968
969 /*
970 * Create a UDP header
971 */
972 uh = udp_hdr(skb);
973 uh->source = fl6->fl6_sport;
974 uh->dest = fl6->fl6_dport;
975 uh->len = htons(up->len);
976 uh->check = 0;
977
978 if (is_udplite)
979 csum = udplite_csum_outgoing(sk, skb);
980 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
981 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
982 up->len);
983 goto send;
984 } else
985 csum = udp_csum_outgoing(sk, skb);
986
987 /* add protocol-dependent pseudo-header */
988 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
989 up->len, fl6->flowi6_proto, csum);
990 if (uh->check == 0)
991 uh->check = CSUM_MANGLED_0;
992
993 send:
994 err = ip6_push_pending_frames(sk);
995 if (err) {
996 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
997 UDP6_INC_STATS_USER(sock_net(sk),
998 UDP_MIB_SNDBUFERRORS, is_udplite);
999 err = 0;
1000 }
1001 } else
1002 UDP6_INC_STATS_USER(sock_net(sk),
1003 UDP_MIB_OUTDATAGRAMS, is_udplite);
1004 out:
1005 up->len = 0;
1006 up->pending = 0;
1007 return err;
1008 }
1009
1010 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1011 struct msghdr *msg, size_t len)
1012 {
1013 struct ipv6_txoptions opt_space;
1014 struct udp_sock *up = udp_sk(sk);
1015 struct inet_sock *inet = inet_sk(sk);
1016 struct ipv6_pinfo *np = inet6_sk(sk);
1017 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1018 struct in6_addr *daddr, *final_p, final;
1019 struct ipv6_txoptions *opt = NULL;
1020 struct ip6_flowlabel *flowlabel = NULL;
1021 struct flowi6 fl6;
1022 struct dst_entry *dst;
1023 int addr_len = msg->msg_namelen;
1024 int ulen = len;
1025 int hlimit = -1;
1026 int tclass = -1;
1027 int dontfrag = -1;
1028 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1029 int err;
1030 int connected = 0;
1031 int is_udplite = IS_UDPLITE(sk);
1032 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1033
1034 /* destination address check */
1035 if (sin6) {
1036 if (addr_len < offsetof(struct sockaddr, sa_data))
1037 return -EINVAL;
1038
1039 switch (sin6->sin6_family) {
1040 case AF_INET6:
1041 if (addr_len < SIN6_LEN_RFC2133)
1042 return -EINVAL;
1043 daddr = &sin6->sin6_addr;
1044 break;
1045 case AF_INET:
1046 goto do_udp_sendmsg;
1047 case AF_UNSPEC:
1048 msg->msg_name = sin6 = NULL;
1049 msg->msg_namelen = addr_len = 0;
1050 daddr = NULL;
1051 break;
1052 default:
1053 return -EINVAL;
1054 }
1055 } else if (!up->pending) {
1056 if (sk->sk_state != TCP_ESTABLISHED)
1057 return -EDESTADDRREQ;
1058 daddr = &np->daddr;
1059 } else
1060 daddr = NULL;
1061
1062 if (daddr) {
1063 if (ipv6_addr_v4mapped(daddr)) {
1064 struct sockaddr_in sin;
1065 sin.sin_family = AF_INET;
1066 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1067 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1068 msg->msg_name = &sin;
1069 msg->msg_namelen = sizeof(sin);
1070 do_udp_sendmsg:
1071 if (__ipv6_only_sock(sk))
1072 return -ENETUNREACH;
1073 return udp_sendmsg(iocb, sk, msg, len);
1074 }
1075 }
1076
1077 if (up->pending == AF_INET)
1078 return udp_sendmsg(iocb, sk, msg, len);
1079
1080 /* Rough check on arithmetic overflow,
1081 better check is made in ip6_append_data().
1082 */
1083 if (len > INT_MAX - sizeof(struct udphdr))
1084 return -EMSGSIZE;
1085
1086 if (up->pending) {
1087 /*
1088 * There are pending frames.
1089 * The socket lock must be held while it's corked.
1090 */
1091 lock_sock(sk);
1092 if (likely(up->pending)) {
1093 if (unlikely(up->pending != AF_INET6)) {
1094 release_sock(sk);
1095 return -EAFNOSUPPORT;
1096 }
1097 dst = NULL;
1098 goto do_append_data;
1099 }
1100 release_sock(sk);
1101 }
1102 ulen += sizeof(struct udphdr);
1103
1104 memset(&fl6, 0, sizeof(fl6));
1105
1106 if (sin6) {
1107 if (sin6->sin6_port == 0)
1108 return -EINVAL;
1109
1110 fl6.fl6_dport = sin6->sin6_port;
1111 daddr = &sin6->sin6_addr;
1112
1113 if (np->sndflow) {
1114 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1115 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1116 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1117 if (flowlabel == NULL)
1118 return -EINVAL;
1119 daddr = &flowlabel->dst;
1120 }
1121 }
1122
1123 /*
1124 * Otherwise it will be difficult to maintain
1125 * sk->sk_dst_cache.
1126 */
1127 if (sk->sk_state == TCP_ESTABLISHED &&
1128 ipv6_addr_equal(daddr, &np->daddr))
1129 daddr = &np->daddr;
1130
1131 if (addr_len >= sizeof(struct sockaddr_in6) &&
1132 sin6->sin6_scope_id &&
1133 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
1134 fl6.flowi6_oif = sin6->sin6_scope_id;
1135 } else {
1136 if (sk->sk_state != TCP_ESTABLISHED)
1137 return -EDESTADDRREQ;
1138
1139 fl6.fl6_dport = inet->inet_dport;
1140 daddr = &np->daddr;
1141 fl6.flowlabel = np->flow_label;
1142 connected = 1;
1143 }
1144
1145 if (!fl6.flowi6_oif)
1146 fl6.flowi6_oif = sk->sk_bound_dev_if;
1147
1148 if (!fl6.flowi6_oif)
1149 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1150
1151 fl6.flowi6_mark = sk->sk_mark;
1152 fl6.flowi6_uid = sock_i_uid(sk);
1153
1154 if (msg->msg_controllen) {
1155 opt = &opt_space;
1156 memset(opt, 0, sizeof(struct ipv6_txoptions));
1157 opt->tot_len = sizeof(*opt);
1158
1159 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1160 &hlimit, &tclass, &dontfrag);
1161 if (err < 0) {
1162 fl6_sock_release(flowlabel);
1163 return err;
1164 }
1165 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1166 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1167 if (flowlabel == NULL)
1168 return -EINVAL;
1169 }
1170 if (!(opt->opt_nflen|opt->opt_flen))
1171 opt = NULL;
1172 connected = 0;
1173 }
1174 if (opt == NULL)
1175 opt = np->opt;
1176 if (flowlabel)
1177 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1178 opt = ipv6_fixup_options(&opt_space, opt);
1179
1180 fl6.flowi6_proto = sk->sk_protocol;
1181 if (!ipv6_addr_any(daddr))
1182 fl6.daddr = *daddr;
1183 else
1184 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1185 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1186 fl6.saddr = np->saddr;
1187 fl6.fl6_sport = inet->inet_sport;
1188
1189 final_p = fl6_update_dst(&fl6, opt, &final);
1190 if (final_p)
1191 connected = 0;
1192
1193 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1194 fl6.flowi6_oif = np->mcast_oif;
1195 connected = 0;
1196 } else if (!fl6.flowi6_oif)
1197 fl6.flowi6_oif = np->ucast_oif;
1198
1199 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1200
1201 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1202 if (IS_ERR(dst)) {
1203 err = PTR_ERR(dst);
1204 dst = NULL;
1205 goto out;
1206 }
1207
1208 if (hlimit < 0) {
1209 if (ipv6_addr_is_multicast(&fl6.daddr))
1210 hlimit = np->mcast_hops;
1211 else
1212 hlimit = np->hop_limit;
1213 if (hlimit < 0)
1214 hlimit = ip6_dst_hoplimit(dst);
1215 }
1216
1217 if (tclass < 0)
1218 tclass = np->tclass;
1219
1220 if (dontfrag < 0)
1221 dontfrag = np->dontfrag;
1222
1223 if (msg->msg_flags&MSG_CONFIRM)
1224 goto do_confirm;
1225 back_from_confirm:
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 LIMIT_NETDEBUG(KERN_DEBUG "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 up->len += ulen;
1242 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1243 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1244 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1245 (struct rt6_info*)dst,
1246 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
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 (dst) {
1255 if (connected) {
1256 ip6_dst_store(sk, dst,
1257 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1258 &np->daddr : NULL,
1259 #ifdef CONFIG_IPV6_SUBTREES
1260 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1261 &np->saddr :
1262 #endif
1263 NULL);
1264 } else {
1265 dst_release(dst);
1266 }
1267 dst = NULL;
1268 }
1269
1270 if (err > 0)
1271 err = np->recverr ? net_xmit_errno(err) : 0;
1272 release_sock(sk);
1273 out:
1274 dst_release(dst);
1275 fl6_sock_release(flowlabel);
1276 if (!err)
1277 return len;
1278 /*
1279 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1280 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1281 * we don't have a good statistic (IpOutDiscards but it can be too many
1282 * things). We could add another new stat but at least for now that
1283 * seems like overkill.
1284 */
1285 /* MTK_NET */
1286 if (err == -ENOBUFS || (sk->sk_socket && test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) ) {
1287 UDP6_INC_STATS_USER(sock_net(sk),
1288 UDP_MIB_SNDBUFERRORS, is_udplite);
1289 }
1290 return err;
1291
1292 do_confirm:
1293 dst_confirm(dst);
1294 if (!(msg->msg_flags&MSG_PROBE) || len)
1295 goto back_from_confirm;
1296 err = 0;
1297 goto out;
1298 }
1299
1300 void udpv6_destroy_sock(struct sock *sk)
1301 {
1302 struct udp_sock *up = udp_sk(sk);
1303 lock_sock(sk);
1304 udp_v6_flush_pending_frames(sk);
1305 release_sock(sk);
1306
1307 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
1308 void (*encap_destroy)(struct sock *sk);
1309 encap_destroy = ACCESS_ONCE(up->encap_destroy);
1310 if (encap_destroy)
1311 encap_destroy(sk);
1312 }
1313
1314 inet6_destroy_sock(sk);
1315 }
1316
1317 /*
1318 * Socket option code for UDP
1319 */
1320 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1321 char __user *optval, unsigned int optlen)
1322 {
1323 if (level == SOL_UDP || level == SOL_UDPLITE)
1324 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1325 udp_v6_push_pending_frames);
1326 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1327 }
1328
1329 #ifdef CONFIG_COMPAT
1330 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1331 char __user *optval, unsigned int optlen)
1332 {
1333 if (level == SOL_UDP || level == SOL_UDPLITE)
1334 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1335 udp_v6_push_pending_frames);
1336 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1337 }
1338 #endif
1339
1340 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1341 char __user *optval, int __user *optlen)
1342 {
1343 if (level == SOL_UDP || level == SOL_UDPLITE)
1344 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1345 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1346 }
1347
1348 #ifdef CONFIG_COMPAT
1349 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1350 char __user *optval, int __user *optlen)
1351 {
1352 if (level == SOL_UDP || level == SOL_UDPLITE)
1353 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1354 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1355 }
1356 #endif
1357
1358 static const struct inet6_protocol udpv6_protocol = {
1359 .handler = udpv6_rcv,
1360 .err_handler = udpv6_err,
1361 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1362 };
1363
1364 /* ------------------------------------------------------------------------ */
1365 #ifdef CONFIG_PROC_FS
1366
1367 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1368 {
1369 struct inet_sock *inet = inet_sk(sp);
1370 struct ipv6_pinfo *np = inet6_sk(sp);
1371 const struct in6_addr *dest, *src;
1372 __u16 destp, srcp;
1373
1374 dest = &np->daddr;
1375 src = &np->rcv_saddr;
1376 destp = ntohs(inet->inet_dport);
1377 srcp = ntohs(inet->inet_sport);
1378 seq_printf(seq,
1379 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1380 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1381 bucket,
1382 src->s6_addr32[0], src->s6_addr32[1],
1383 src->s6_addr32[2], src->s6_addr32[3], srcp,
1384 dest->s6_addr32[0], dest->s6_addr32[1],
1385 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1386 sp->sk_state,
1387 sk_wmem_alloc_get(sp),
1388 sk_rmem_alloc_get(sp),
1389 0, 0L, 0,
1390 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1391 0,
1392 sock_i_ino(sp),
1393 atomic_read(&sp->sk_refcnt), sp,
1394 atomic_read(&sp->sk_drops));
1395 }
1396
1397 int udp6_seq_show(struct seq_file *seq, void *v)
1398 {
1399 if (v == SEQ_START_TOKEN)
1400 seq_printf(seq,
1401 " sl "
1402 "local_address "
1403 "remote_address "
1404 "st tx_queue rx_queue tr tm->when retrnsmt"
1405 " uid timeout inode ref pointer drops\n");
1406 else
1407 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1408 return 0;
1409 }
1410
1411 static const struct file_operations udp6_afinfo_seq_fops = {
1412 .owner = THIS_MODULE,
1413 .open = udp_seq_open,
1414 .read = seq_read,
1415 .llseek = seq_lseek,
1416 .release = seq_release_net
1417 };
1418
1419 static struct udp_seq_afinfo udp6_seq_afinfo = {
1420 .name = "udp6",
1421 .family = AF_INET6,
1422 .udp_table = &udp_table,
1423 .seq_fops = &udp6_afinfo_seq_fops,
1424 .seq_ops = {
1425 .show = udp6_seq_show,
1426 },
1427 };
1428
1429 int __net_init udp6_proc_init(struct net *net)
1430 {
1431 return udp_proc_register(net, &udp6_seq_afinfo);
1432 }
1433
1434 void udp6_proc_exit(struct net *net) {
1435 udp_proc_unregister(net, &udp6_seq_afinfo);
1436 }
1437 #endif /* CONFIG_PROC_FS */
1438
1439 void udp_v6_clear_sk(struct sock *sk, int size)
1440 {
1441 struct inet_sock *inet = inet_sk(sk);
1442
1443 /* we do not want to clear pinet6 field, because of RCU lookups */
1444 sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
1445
1446 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1447 memset(&inet->pinet6 + 1, 0, size);
1448 }
1449
1450 /* ------------------------------------------------------------------------ */
1451
1452 struct proto udpv6_prot = {
1453 .name = "UDPv6",
1454 .owner = THIS_MODULE,
1455 .close = udp_lib_close,
1456 .connect = ip6_datagram_connect,
1457 .disconnect = udp_disconnect,
1458 .ioctl = udp_ioctl,
1459 .destroy = udpv6_destroy_sock,
1460 .setsockopt = udpv6_setsockopt,
1461 .getsockopt = udpv6_getsockopt,
1462 .sendmsg = udpv6_sendmsg,
1463 .recvmsg = udpv6_recvmsg,
1464 .backlog_rcv = __udpv6_queue_rcv_skb,
1465 .hash = udp_lib_hash,
1466 .unhash = udp_lib_unhash,
1467 .rehash = udp_v6_rehash,
1468 .get_port = udp_v6_get_port,
1469 .memory_allocated = &udp_memory_allocated,
1470 .sysctl_mem = sysctl_udp_mem,
1471 .sysctl_wmem = &sysctl_udp_wmem_min,
1472 .sysctl_rmem = &sysctl_udp_rmem_min,
1473 .obj_size = sizeof(struct udp6_sock),
1474 .slab_flags = SLAB_DESTROY_BY_RCU,
1475 .h.udp_table = &udp_table,
1476 #ifdef CONFIG_COMPAT
1477 .compat_setsockopt = compat_udpv6_setsockopt,
1478 .compat_getsockopt = compat_udpv6_getsockopt,
1479 #endif
1480 .clear_sk = udp_v6_clear_sk,
1481 };
1482
1483 static struct inet_protosw udpv6_protosw = {
1484 .type = SOCK_DGRAM,
1485 .protocol = IPPROTO_UDP,
1486 .prot = &udpv6_prot,
1487 .ops = &inet6_dgram_ops,
1488 .no_check = UDP_CSUM_DEFAULT,
1489 .flags = INET_PROTOSW_PERMANENT,
1490 };
1491
1492
1493 int __init udpv6_init(void)
1494 {
1495 int ret;
1496
1497 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1498 if (ret)
1499 goto out;
1500
1501 ret = inet6_register_protosw(&udpv6_protosw);
1502 if (ret)
1503 goto out_udpv6_protocol;
1504 out:
1505 return ret;
1506
1507 out_udpv6_protocol:
1508 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1509 goto out;
1510 }
1511
1512 void udpv6_exit(void)
1513 {
1514 inet6_unregister_protosw(&udpv6_protosw);
1515 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1516 }
kernel source for telekom puls (alcatel/mediatek)