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import PULS_20180308
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / udp.c
CommitLineData
1da177e4
LT		 1/*
2 * UDP over IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 *
8 * Based on linux/ipv4/udp.c
9 *
1da177e4
LT		 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
1da177e4
LT		 24#include <linux/errno.h>
25#include <linux/types.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
1da177e4
LT		 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>
1781f7f5 35#include <linux/module.h>
3305b80c 36#include <linux/skbuff.h>
5a0e3ad6 37#include <linux/slab.h>
1da177e4
LT		 38#include <asm/uaccess.h>
39
1da177e4
LT		 40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/transp_v6.h>
43#include <net/ip6_route.h>
1da177e4 44#include <net/raw.h>
c752f073 45#include <net/tcp_states.h>
1da177e4
LT		 46#include <net/ip6_checksum.h>
47#include <net/xfrm.h>
72289b96 48#include <net/inet6_hashtables.h>
1da177e4
LT		 49
50#include <linux/proc_fs.h>
51#include <linux/seq_file.h>
22911fc5 52#include <trace/events/skb.h>
ba4e58ec 53#include "udp_impl.h"
1da177e4 54
b2f5e7cd
VY		 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);
68835aba
ED		 59 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
60 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
b2f5e7cd
VY		 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)
499923c7 68 return (!sk2_ipv6only &&
c720c7e8
ED		 69 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
70 sk1_rcv_saddr == sk2_rcv_saddr));
b2f5e7cd
VY		 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
d4cada4a
ED		 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);
856540ee 95 else if (ipv6_addr_v4mapped(addr6))
0eae88f3 96 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
d4cada4a 97 else
0eae88f3 98 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
d4cada4a
ED		 99
100 return hash ^ port;
101}
102
103
6ba5a3c5 104int udp_v6_get_port(struct sock *sk, unsigned short snum)
1da177e4 105{
30fff923
ED		 106 unsigned int hash2_nulladdr =
107 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
9a52e97e 108 unsigned int hash2_partial =
30fff923
ED		 109 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
110
d4cada4a 111 /* precompute partial secondary hash */
30fff923
ED		 112 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
113 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
1da177e4
LT		 114}
115
719f8358
ED		 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
645ca708
ED		 125static inline int compute_score(struct sock *sk, struct net *net,
126 unsigned short hnum,
88440ae7
BS		 127 const struct in6_addr *saddr, __be16 sport,
128 const struct in6_addr *daddr, __be16 dport,
645ca708
ED		 129 int dif)
130{
131 int score = -1;
132
d4cada4a 133 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
645ca708
ED		 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;
c720c7e8
ED		 139 if (inet->inet_dport) {
140 if (inet->inet_dport != sport)
645ca708
ED		 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
fddc17de
ED		 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
fddc17de
ED		 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;
72289b96
TH		 207 int score, badness, matches = 0, reuseport = 0;
208 u32 hash = 0;
fddc17de
ED		 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;
72289b96
TH		 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)
fddc17de 225 goto exact_match;
72289b96
TH		 226 } else if (score == badness && reuseport) {
227 matches++;
228 if (((u64)hash * matches) >> 32 == 0)
229 result = sk;
230 hash = next_pseudo_random32(hash);
fddc17de
ED		 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:
c31504dc 243 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
fddc17de
ED		 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
fce82338 254struct sock *__udp6_lib_lookup(struct net *net,
88440ae7
BS		 255 const struct in6_addr *saddr, __be16 sport,
256 const struct in6_addr *daddr, __be16 dport,
645ca708 257 int dif, struct udp_table *udptable)
1da177e4 258{
271b72c7 259 struct sock *sk, *result;
88ab1932 260 struct hlist_nulls_node *node;
1da177e4 261 unsigned short hnum = ntohs(dport);
fddc17de
ED		 262 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
263 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
72289b96
TH		 264 int score, badness, matches = 0, reuseport = 0;
265 u32 hash = 0;
645ca708 266
271b72c7 267 rcu_read_lock();
fddc17de
ED		 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
1223c67c
JBD		 285 result = udp6_lib_lookup2(net, saddr, sport,
286 &in6addr_any, hnum, dif,
fddc17de
ED		 287 hslot2, slot2);
288 }
289 rcu_read_unlock();
290 return result;
291 }
271b72c7
ED		 292begin:
293 result = NULL;
294 badness = -1;
88ab1932 295 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
645ca708
ED		 296 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
297 if (score > badness) {
298 result = sk;
299 badness = score;
72289b96
TH		 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);
1da177e4
LT		 311 }
312 }
88ab1932
ED		 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 */
fddc17de 318 if (get_nulls_value(node) != slot)
88ab1932
ED		 319 goto begin;
320
271b72c7 321 if (result) {
c31504dc 322 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
271b72c7
ED		 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();
1da177e4
LT		 331 return result;
332}
fce82338 333EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
1da177e4 334
607c4aaf
KK		 335static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
336 __be16 sport, __be16 dport,
645ca708 337 struct udp_table *udptable)
607c4aaf 338{
23542618 339 struct sock *sk;
b71d1d42 340 const struct ipv6hdr *iph = ipv6_hdr(skb);
607c4aaf 341
23542618
KK		 342 if (unlikely(sk = skb_steal_sock(skb)))
343 return sk;
adf30907
ED		 344 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
345 &iph->daddr, dport, inet6_iif(skb),
346 udptable);
607c4aaf
KK		 347}
348
aa976fc0
BS		 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
1da177e4
LT		 357/*
358 * This should be easy, if there is something there we
359 * return it, otherwise we block.
360 */
361
ba4e58ec 362int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 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);
1ab1457c 368 struct sk_buff *skb;
59c2cdae 369 unsigned int ulen, copied;
3f518bf7 370 int peeked, off = 0;
759e5d00
HX		 371 int err;
372 int is_udplite = IS_UDPLITE(sk);
4b9e9796 373 bool checksum_valid = false;
f26ba175 374 int is_udp4;
8a74ad60 375 bool slow;
1da177e4 376
1da177e4 377 if (flags & MSG_ERRQUEUE)
08c62a10 378 return ipv6_recv_error(sk, msg, len, addr_len);
1da177e4 379
4b340ae2 380 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
08c62a10 381 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
4b340ae2 382
1da177e4 383try_again:
a59322be 384 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
3f518bf7 385 &peeked, &off, &err);
1da177e4
LT		 386 if (!skb)
387 goto out;
388
759e5d00 389 ulen = skb->len - sizeof(struct udphdr);
59c2cdae
DM		 390 copied = len;
391 if (copied > ulen)
392 copied = ulen;
393 else if (copied < ulen)
1ab1457c 394 msg->msg_flags |= MSG_TRUNC;
1da177e4 395
f26ba175
WY		 396 is_udp4 = (skb->protocol == htons(ETH_P_IP));
397
ba4e58ec 398 /*
759e5d00
HX		 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.
ba4e58ec 402 */
ba4e58ec 403
59c2cdae 404 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
4b9e9796
S		 405 checksum_valid = !udp_lib_checksum_complete(skb);
406 if (!checksum_valid)
1da177e4 407 goto csum_copy_err;
ba4e58ec
GR		 408 }
409
4b9e9796 410 if (checksum_valid || skb_csum_unnecessary(skb))
ba4e58ec 411 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
22911fc5 412 msg->msg_iov, copied);
ba4e58ec 413 else {
1da177e4
LT		 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 }
22911fc5
ED		 418 if (unlikely(err)) {
419 trace_kfree_skb(skb, udpv6_recvmsg);
979402b1
ED		 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 }
1da177e4 431 goto out_free;
22911fc5 432 }
f26ba175
WY		 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 }
cb75994e 441
3b885787 442 sock_recv_ts_and_drops(msg, sk, skb);
1da177e4
LT		 443
444 /* Copy the address. */
445 if (msg->msg_name) {
446 struct sockaddr_in6 *sin6;
1ab1457c 447
1da177e4
LT		 448 sin6 = (struct sockaddr_in6 *) msg->msg_name;
449 sin6->sin6_family = AF_INET6;
4bedb452 450 sin6->sin6_port = udp_hdr(skb)->source;
1da177e4 451 sin6->sin6_flowinfo = 0;
1da177e4 452
842df073 453 if (is_udp4) {
b301e82c
BH		 454 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
455 &sin6->sin6_addr);
842df073
HFS		 456 sin6->sin6_scope_id = 0;
457 } else {
4e3fd7a0 458 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
842df073
HFS		 459 sin6->sin6_scope_id =
460 ipv6_iface_scope_id(&sin6->sin6_addr,
461 IP6CB(skb)->iif);
1da177e4 462 }
a2214488 463 *addr_len = sizeof(*sin6);
1da177e4 464 }
f26ba175 465 if (is_udp4) {
1da177e4
LT		 466 if (inet->cmsg_flags)
467 ip_cmsg_recv(msg, skb);
468 } else {
469 if (np->rxopt.all)
73df66f8 470 ip6_datagram_recv_ctl(sk, msg, skb);
1ab1457c 471 }
1da177e4 472
59c2cdae 473 err = copied;
1da177e4 474 if (flags & MSG_TRUNC)
759e5d00 475 err = ulen;
1da177e4
LT		 476
477out_free:
9d410c79 478 skb_free_datagram_locked(sk, skb);
1da177e4
LT		 479out:
480 return err;
481
482csum_copy_err:
8a74ad60 483 slow = lock_sock_fast(sk);
0856f939 484 if (!skb_kill_datagram(sk, skb, flags)) {
6a5dc9e5
ED		 485 if (is_udp4) {
486 UDP_INC_STATS_USER(sock_net(sk),
487 UDP_MIB_CSUMERRORS, is_udplite);
0856f939
WY		 488 UDP_INC_STATS_USER(sock_net(sk),
489 UDP_MIB_INERRORS, is_udplite);
6a5dc9e5
ED		 490 } else {
491 UDP6_INC_STATS_USER(sock_net(sk),
492 UDP_MIB_CSUMERRORS, is_udplite);
0856f939
WY		 493 UDP6_INC_STATS_USER(sock_net(sk),
494 UDP_MIB_INERRORS, is_udplite);
6a5dc9e5 495 }
0856f939 496 }
8a74ad60 497 unlock_sock_fast(sk, slow);
1da177e4 498
4b9e9796
S		 499 /* starting over for a new packet, but check if we need to yield */
500 cond_resched();
9cfaa8de 501 msg->msg_flags &= ~MSG_TRUNC;
1da177e4
LT		 502 goto try_again;
503}
504
ba4e58ec 505void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
d5fdd6ba 506 u8 type, u8 code, int offset, __be32 info,
645ca708 507 struct udp_table *udptable)
1da177e4
LT		 508{
509 struct ipv6_pinfo *np;
b71d1d42
ED		 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;
1da177e4
LT		 513 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
514 struct sock *sk;
515 int err;
516
c346dca1 517 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
ba4e58ec 518 saddr, uh->source, inet6_iif(skb), udptable);
1da177e4
LT		 519 if (sk == NULL)
520 return;
521
81aded24
DM		 522 if (type == ICMPV6_PKT_TOOBIG)
523 ip6_sk_update_pmtu(skb, sk, info);
ec18d9a2
DM		 524 if (type == NDISC_REDIRECT)
525 ip6_sk_redirect(skb, sk);
81aded24 526
1da177e4
LT		 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
b1faf566 535 if (np->recverr)
1da177e4 536 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
b1faf566 537
1da177e4
LT		 538 sk->sk_err = err;
539 sk->sk_error_report(sk);
540out:
541 sock_put(sk);
542}
543
f7ad74fe
BL		 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
ba4e58ec 566static __inline__ void udpv6_err(struct sk_buff *skb,
d5fdd6ba
BH		 567 struct inet6_skb_parm *opt, u8 type,
568 u8 code, int offset, __be32 info )
ba4e58ec 569{
645ca708 570 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
ba4e58ec
GR		 571}
572
d7f3f621
BL		 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
f7ad74fe 581int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1da177e4 582{
ba4e58ec 583 struct udp_sock *up = udp_sk(sk);
a18135eb 584 int rc;
b2bf1e26 585 int is_udplite = IS_UDPLITE(sk);
a18135eb 586
ba4e58ec
GR		 587 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
588 goto drop;
1da177e4 589
d7f3f621
BL		 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
ba4e58ec
GR		 621 /*
622 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
623 */
b2bf1e26 624 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
ba4e58ec
GR		 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 }
1da177e4
LT		 638 }
639
33d480ce 640 if (rcu_access_pointer(sk->sk_filter)) {
1ab6eb62 641 if (udp_lib_checksum_complete(skb))
6a5dc9e5 642 goto csum_error;
1ab6eb62 643 }
ba4e58ec 644
cb80ef46
BL		 645 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
646 goto drop;
647
d826eb14 648 skb_dst_drop(skb);
cb75994e 649
cb80ef46
BL		 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);
f7ad74fe
BL		 659
660 return rc;
6a5dc9e5
ED		 661csum_error:
662 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
ba4e58ec 663drop:
ef28d1a2 664 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
cb80ef46 665 atomic_inc(&sk->sk_drops);
ba4e58ec
GR		 666 kfree_skb(skb);
667 return -1;
1da177e4
LT		 668}
669
920a4611 670static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
b71d1d42
ED		 671 __be16 loc_port, const struct in6_addr *loc_addr,
672 __be16 rmt_port, const struct in6_addr *rmt_addr,
1da177e4
LT		 673 int dif)
674{
88ab1932 675 struct hlist_nulls_node *node;
1da177e4
LT		 676 struct sock *s = sk;
677 unsigned short num = ntohs(loc_port);
678
88ab1932 679 sk_nulls_for_each_from(s, node) {
1da177e4
LT		 680 struct inet_sock *inet = inet_sk(s);
681
920a4611 682 if (!net_eq(sock_net(s), net))
b8ad0cbc
DL		 683 continue;
684
d4cada4a
ED		 685 if (udp_sk(s)->udp_port_hash == num &&
686 s->sk_family == PF_INET6) {
1da177e4 687 struct ipv6_pinfo *np = inet6_sk(s);
c720c7e8
ED		 688 if (inet->inet_dport) {
689 if (inet->inet_dport != rmt_port)
1da177e4
LT		 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)) {
40796c5e
DS		 700 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
701 continue;
1da177e4 702 }
add459aa 703 if (!inet6_mc_check(s, loc_addr, rmt_addr))
1da177e4
LT		 704 continue;
705 return s;
706 }
707 }
708 return NULL;
709}
710
a1ab77f9
ED		 711static void flush_stack(struct sock **stack, unsigned int count,
712 struct sk_buff *skb, unsigned int final)
713{
cb80ef46 714 struct sk_buff *skb1 = NULL;
a1ab77f9 715 struct sock *sk;
cb80ef46 716 unsigned int i;
a1ab77f9
ED		 717
718 for (i = 0; i < count; i++) {
f6b8f32c 719 sk = stack[i];
cb80ef46
BL		 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));
a1ab77f9 728 }
cb80ef46
BL		 729
730 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
731 skb1 = NULL;
a1ab77f9 732 }
cb80ef46
BL		 733 if (unlikely(skb1))
734 kfree_skb(skb1);
a1ab77f9 735}
1da177e4
LT		 736/*
737 * Note: called only from the BH handler context,
738 * so we don't need to lock the hashes.
739 */
e3163493 740static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
b71d1d42 741 const struct in6_addr *saddr, const struct in6_addr *daddr,
645ca708 742 struct udp_table *udptable)
1da177e4 743{
a1ab77f9 744 struct sock *sk, *stack[256 / sizeof(struct sock *)];
4bedb452 745 const struct udphdr *uh = udp_hdr(skb);
f86dcc5a 746 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
1da177e4 747 int dif;
a1ab77f9 748 unsigned int i, count = 0;
1da177e4 749
645ca708 750 spin_lock(&hslot->lock);
88ab1932 751 sk = sk_nulls_head(&hslot->head);
f2776ff0 752 dif = inet6_iif(skb);
920a4611 753 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
a1ab77f9
ED		 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;
95766fff 763 }
1da177e4 764 }
a1ab77f9
ED		 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
645ca708 771 spin_unlock(&hslot->lock);
a1ab77f9
ED		 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 }
ba4e58ec 781 return 0;
1da177e4
LT		 782}
783
645ca708 784int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
759e5d00 785 int proto)
1da177e4 786{
3ffe533c 787 struct net *net = dev_net(skb->dev);
1da177e4 788 struct sock *sk;
1ab1457c 789 struct udphdr *uh;
b71d1d42 790 const struct in6_addr *saddr, *daddr;
1da177e4
LT		 791 u32 ulen = 0;
792
793 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
d6bc0149 794 goto discard;
1da177e4 795
0660e03f
ACM		 796 saddr = &ipv6_hdr(skb)->saddr;
797 daddr = &ipv6_hdr(skb)->daddr;
4bedb452 798 uh = udp_hdr(skb);
1da177e4
LT		 799
800 ulen = ntohs(uh->len);
ba4e58ec
GR		 801 if (ulen > skb->len)
802 goto short_packet;
1da177e4 803
759e5d00
HX		 804 if (proto == IPPROTO_UDP) {
805 /* UDP validates ulen. */
1da177e4 806
ba4e58ec
GR		 807 /* Check for jumbo payload */
808 if (ulen == 0)
809 ulen = skb->len;
1da177e4 810
ba4e58ec
GR		 811 if (ulen < sizeof(*uh))
812 goto short_packet;
1da177e4 813
ba4e58ec
GR		 814 if (ulen < skb->len) {
815 if (pskb_trim_rcsum(skb, ulen))
816 goto short_packet;
0660e03f
ACM		 817 saddr = &ipv6_hdr(skb)->saddr;
818 daddr = &ipv6_hdr(skb)->daddr;
4bedb452 819 uh = udp_hdr(skb);
ba4e58ec 820 }
ba4e58ec 821 }
1da177e4 822
759e5d00 823 if (udp6_csum_init(skb, uh, proto))
6a5dc9e5 824 goto csum_error;
759e5d00 825
1ab1457c
YH		 826 /*
827 * Multicast receive code
1da177e4 828 */
ba4e58ec 829 if (ipv6_addr_is_multicast(daddr))
e3163493
PE		 830 return __udp6_lib_mcast_deliver(net, skb,
831 saddr, daddr, udptable);
1da177e4
LT		 832
833 /* Unicast */
834
1ab1457c 835 /*
1da177e4
LT		 836 * check socket cache ... must talk to Alan about his plans
837 * for sock caches... i'll skip this for now.
838 */
607c4aaf 839 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
cb80ef46
BL		 840 if (sk != NULL) {
841 int ret = udpv6_queue_rcv_skb(sk, skb);
842 sock_put(sk);
1da177e4 843
cb80ef46
BL		 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;
1da177e4 849
add459aa 850 return 0;
1da177e4 851 }
1ab1457c 852
cb80ef46 853 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
c377411f 854 goto discard;
cb80ef46
BL		 855
856 if (udp_lib_checksum_complete(skb))
6a5dc9e5 857 goto csum_error;
cb80ef46
BL		 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);
add459aa 863 return 0;
1da177e4 864
1ab1457c 865short_packet:
d6bc0149 866 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
db8dac20 867 proto == IPPROTO_UDPLITE ? "-Lite" : "",
d6bc0149
BM		 868 saddr,
869 ntohs(uh->source),
870 ulen,
871 skb->len,
872 daddr,
873 ntohs(uh->dest));
6a5dc9e5
ED		 874 goto discard;
875csum_error:
876 UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1da177e4 877discard:
ef28d1a2 878 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1da177e4 879 kfree_skb(skb);
add459aa 880 return 0;
1da177e4 881}
ba4e58ec 882
e5bbef20 883static __inline__ int udpv6_rcv(struct sk_buff *skb)
ba4e58ec 884{
645ca708 885 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
ba4e58ec
GR		 886}
887
1da177e4
LT		 888/*
889 * Throw away all pending data and cancel the corking. Socket is locked.
890 */
891static void udp_v6_flush_pending_frames(struct sock *sk)
892{
893 struct udp_sock *up = udp_sk(sk);
894
36d926b9
DL		 895 if (up->pending == AF_INET)
896 udp_flush_pending_frames(sk);
897 else if (up->pending) {
1da177e4
LT		 898 up->len = 0;
899 up->pending = 0;
900 ip6_flush_pending_frames(sk);
1ab1457c 901 }
1da177e4
LT		 902}
903
493c6be3
SS		 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 */
910static 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
1da177e4
LT		 945/*
946 * Sending
947 */
948
4c0a6cb0 949static int udp_v6_push_pending_frames(struct sock *sk)
1da177e4
LT		 950{
951 struct sk_buff *skb;
952 struct udphdr *uh;
4c0a6cb0 953 struct udp_sock *up = udp_sk(sk);
1da177e4 954 struct inet_sock *inet = inet_sk(sk);
07243c3d 955 struct flowi6 *fl6;
1da177e4 956 int err = 0;
b2bf1e26 957 int is_udplite = IS_UDPLITE(sk);
868c86bc 958 __wsum csum = 0;
1da177e4 959
07243c3d
HFS		 960 if (up->pending == AF_INET)
961 return udp_push_pending_frames(sk);
962
963 fl6 = &inet->cork.fl.u.ip6;
964
1da177e4
LT		 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 */
4bedb452 972 uh = udp_hdr(skb);
1958b856
DM		 973 uh->source = fl6->fl6_sport;
974 uh->dest = fl6->fl6_dport;
1da177e4
LT		 975 uh->len = htons(up->len);
976 uh->check = 0;
977
b2bf1e26 978 if (is_udplite)
ba4e58ec 979 csum = udplite_csum_outgoing(sk, skb);
493c6be3 980 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
4c9483b2 981 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
493c6be3
SS		 982 up->len);
983 goto send;
984 } else
ba4e58ec 985 csum = udp_csum_outgoing(sk, skb);
1da177e4 986
ba4e58ec 987 /* add protocol-dependent pseudo-header */
4c9483b2
DM		 988 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
989 up->len, fl6->flowi6_proto, csum);
1da177e4 990 if (uh->check == 0)
f6ab0288 991 uh->check = CSUM_MANGLED_0;
1da177e4 992
493c6be3 993send:
1da177e4 994 err = ip6_push_pending_frames(sk);
6ce9e7b5
ED		 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);
1da177e4
LT		 1004out:
1005 up->len = 0;
1006 up->pending = 0;
1007 return err;
1008}
1009
ba4e58ec 1010int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
1da177e4
LT		 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;
20c59de2 1018 struct in6_addr *daddr, *final_p, final;
1da177e4
LT		 1019 struct ipv6_txoptions *opt = NULL;
1020 struct ip6_flowlabel *flowlabel = NULL;
4c9483b2 1021 struct flowi6 fl6;
1da177e4
LT		 1022 struct dst_entry *dst;
1023 int addr_len = msg->msg_namelen;
1024 int ulen = len;
1025 int hlimit = -1;
41a1f8ea 1026 int tclass = -1;
13b52cd4 1027 int dontfrag = -1;
1da177e4
LT		 1028 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1029 int err;
987905de 1030 int connected = 0;
b2bf1e26 1031 int is_udplite = IS_UDPLITE(sk);
ba4e58ec 1032 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1da177e4
LT		 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;
1ab1457c 1059 } else
1da177e4
LT		 1060 daddr = NULL;
1061
1062 if (daddr) {
e773e4fa 1063 if (ipv6_addr_v4mapped(daddr)) {
1da177e4
LT		 1064 struct sockaddr_in sin;
1065 sin.sin_family = AF_INET;
c720c7e8 1066 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1da177e4
LT		 1067 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1068 msg->msg_name = &sin;
1069 msg->msg_namelen = sizeof(sin);
1070do_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,
b59e139b 1081 better check is made in ip6_append_data().
1da177e4
LT		 1082 */
1083 if (len > INT_MAX - sizeof(struct udphdr))
1084 return -EMSGSIZE;
1ab1457c 1085
1da177e4
LT		 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
4c9483b2 1104 memset(&fl6, 0, sizeof(fl6));
1da177e4
LT		 1105
1106 if (sin6) {
1107 if (sin6->sin6_port == 0)
1108 return -EINVAL;
1109
1958b856 1110 fl6.fl6_dport = sin6->sin6_port;
1da177e4
LT		 1111 daddr = &sin6->sin6_addr;
1112
1113 if (np->sndflow) {
4c9483b2
DM		 1114 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1115 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1116 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1da177e4
LT		 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 &&
842df073 1133 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
4c9483b2 1134 fl6.flowi6_oif = sin6->sin6_scope_id;
1da177e4
LT		 1135 } else {
1136 if (sk->sk_state != TCP_ESTABLISHED)
1137 return -EDESTADDRREQ;
1138
1958b856 1139 fl6.fl6_dport = inet->inet_dport;
1da177e4 1140 daddr = &np->daddr;
4c9483b2 1141 fl6.flowlabel = np->flow_label;
987905de 1142 connected = 1;
1da177e4
LT		 1143 }
1144
4c9483b2
DM		 1145 if (!fl6.flowi6_oif)
1146 fl6.flowi6_oif = sk->sk_bound_dev_if;
1da177e4 1147
4c9483b2
DM		 1148 if (!fl6.flowi6_oif)
1149 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
9f690db7 1150
4c9483b2 1151 fl6.flowi6_mark = sk->sk_mark;
6fa3eb70 1152 fl6.flowi6_uid = sock_i_uid(sk);
51953d5b 1153
1da177e4
LT		 1154 if (msg->msg_controllen) {
1155 opt = &opt_space;
1156 memset(opt, 0, sizeof(struct ipv6_txoptions));
1157 opt->tot_len = sizeof(*opt);
1158
73df66f8
TP		 1159 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1160 &hlimit, &tclass, &dontfrag);
1da177e4
LT		 1161 if (err < 0) {
1162 fl6_sock_release(flowlabel);
1163 return err;
1164 }
4c9483b2
DM		 1165 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1166 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1da177e4
LT		 1167 if (flowlabel == NULL)
1168 return -EINVAL;
1169 }
1170 if (!(opt->opt_nflen|opt->opt_flen))
1171 opt = NULL;
987905de 1172 connected = 0;
1da177e4
LT		 1173 }
1174 if (opt == NULL)
1175 opt = np->opt;
df9890c3
YH		 1176 if (flowlabel)
1177 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1178 opt = ipv6_fixup_options(&opt_space, opt);
1da177e4 1179
4c9483b2 1180 fl6.flowi6_proto = sk->sk_protocol;
876c7f41 1181 if (!ipv6_addr_any(daddr))
4e3fd7a0 1182 fl6.daddr = *daddr;
876c7f41 1183 else
4c9483b2
DM		 1184 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1185 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
4e3fd7a0 1186 fl6.saddr = np->saddr;
1958b856 1187 fl6.fl6_sport = inet->inet_sport;
1ab1457c 1188
4c9483b2 1189 final_p = fl6_update_dst(&fl6, opt, &final);
20c59de2 1190 if (final_p)
987905de 1191 connected = 0;
1da177e4 1192
4c9483b2
DM		 1193 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1194 fl6.flowi6_oif = np->mcast_oif;
987905de 1195 connected = 0;
c4062dfc
EH		 1196 } else if (!fl6.flowi6_oif)
1197 fl6.flowi6_oif = np->ucast_oif;
1da177e4 1198
4c9483b2 1199 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
beb8d13b 1200
4c9483b2 1201 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
68d0c6d3
DM		 1202 if (IS_ERR(dst)) {
1203 err = PTR_ERR(dst);
1204 dst = NULL;
1da177e4 1205 goto out;
14e50e57 1206 }
1da177e4
LT		 1207
1208 if (hlimit < 0) {
4c9483b2 1209 if (ipv6_addr_is_multicast(&fl6.daddr))
1da177e4
LT		 1210 hlimit = np->mcast_hops;
1211 else
1212 hlimit = np->hop_limit;
1213 if (hlimit < 0)
6b75d090 1214 hlimit = ip6_dst_hoplimit(dst);
1da177e4
LT		 1215 }
1216
e651f03a 1217 if (tclass < 0)
41a1f8ea 1218 tclass = np->tclass;
41a1f8ea 1219
13b52cd4
BH		 1220 if (dontfrag < 0)
1221 dontfrag = np->dontfrag;
1222
1da177e4
LT		 1223 if (msg->msg_flags&MSG_CONFIRM)
1224 goto do_confirm;
1225back_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
64ce2073 1233 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1da177e4
LT		 1234 err = -EINVAL;
1235 goto out;
1236 }
1237
1238 up->pending = AF_INET6;
1239
1240do_append_data:
1241 up->len += ulen;
ba4e58ec
GR		 1242 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1243 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
4c9483b2 1244 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
41a1f8ea 1245 (struct rt6_info*)dst,
13b52cd4 1246 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1da177e4
LT		 1247 if (err)
1248 udp_v6_flush_pending_frames(sk);
1249 else if (!corkreq)
4c0a6cb0 1250 err = udp_v6_push_pending_frames(sk);
1e0c14f4
HX		 1251 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1252 up->pending = 0;
1da177e4 1253
a5e7c210
DM		 1254 if (dst) {
1255 if (connected) {
1256 ip6_dst_store(sk, dst,
4c9483b2 1257 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
8e1ef0a9
YH		 1258 &np->daddr : NULL,
1259#ifdef CONFIG_IPV6_SUBTREES
4c9483b2 1260 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
8e1ef0a9
YH		 1261 &np->saddr :
1262#endif
1263 NULL);
a5e7c210
DM		 1264 } else {
1265 dst_release(dst);
1266 }
a3c96089 1267 dst = NULL;
a5e7c210
DM		 1268 }
1269
1da177e4
LT		 1270 if (err > 0)
1271 err = np->recverr ? net_xmit_errno(err) : 0;
1272 release_sock(sk);
1273out:
a3c96089 1274 dst_release(dst);
1da177e4 1275 fl6_sock_release(flowlabel);
cd562c98 1276 if (!err)
1da177e4 1277 return len;
a18135eb
DM		 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 */
6fa3eb70
S		 1285 /* MTK_NET */
1286 if (err == -ENOBUFS || (sk->sk_socket && test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) ) {
235b9f7a
PE		 1287 UDP6_INC_STATS_USER(sock_net(sk),
1288 UDP_MIB_SNDBUFERRORS, is_udplite);
a18135eb 1289 }
1da177e4
LT		 1290 return err;
1291
1292do_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
7d06b2e0 1300void udpv6_destroy_sock(struct sock *sk)
1da177e4 1301{
44046a59 1302 struct udp_sock *up = udp_sk(sk);
1da177e4
LT		 1303 lock_sock(sk);
1304 udp_v6_flush_pending_frames(sk);
1305 release_sock(sk);
1306
44046a59
TP		 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
1da177e4 1314 inet6_destroy_sock(sk);
1da177e4
LT		 1315}
1316
1317/*
1318 * Socket option code for UDP
1319 */
ba4e58ec 1320int udpv6_setsockopt(struct sock *sk, int level, int optname,
b7058842 1321 char __user *optval, unsigned int optlen)
3fdadf7d 1322{
db8dac20 1323 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 1324 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1325 udp_v6_push_pending_frames);
ba4e58ec 1326 return ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1327}
1328
1329#ifdef CONFIG_COMPAT
ba4e58ec 1330int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
b7058842 1331 char __user *optval, unsigned int optlen)
3fdadf7d 1332{
db8dac20 1333 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0
GR		 1334 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1335 udp_v6_push_pending_frames);
ba4e58ec 1336 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1337}
1338#endif
1339
ba4e58ec
GR		 1340int udpv6_getsockopt(struct sock *sk, int level, int optname,
1341 char __user *optval, int __user *optlen)
3fdadf7d 1342{
db8dac20 1343 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 1344 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 1345 return ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1346}
1347
1348#ifdef CONFIG_COMPAT
ba4e58ec
GR		 1349int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1350 char __user *optval, int __user *optlen)
3fdadf7d 1351{
db8dac20 1352 if (level == SOL_UDP || level == SOL_UDPLITE)
4c0a6cb0 1353 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
ba4e58ec 1354 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1355}
1356#endif
1357
41135cc8 1358static const struct inet6_protocol udpv6_protocol = {
1da177e4
LT		 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
1367static 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);
b71d1d42 1371 const struct in6_addr *dest, *src;
1da177e4
LT		 1372 __u16 destp, srcp;
1373
1374 dest = &np->daddr;
1375 src = &np->rcv_saddr;
c720c7e8
ED		 1376 destp = ntohs(inet->inet_dport);
1377 srcp = ntohs(inet->inet_sport);
1da177e4 1378 seq_printf(seq,
f86dcc5a 1379 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 1380 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1da177e4
LT		 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,
1ab1457c 1386 sp->sk_state,
31e6d363
ED		 1387 sk_wmem_alloc_get(sp),
1388 sk_rmem_alloc_get(sp),
1da177e4 1389 0, 0L, 0,
a7cb5a49
EB		 1390 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1391 0,
1da177e4 1392 sock_i_ino(sp),
cb61cb9b
ED		 1393 atomic_read(&sp->sk_refcnt), sp,
1394 atomic_read(&sp->sk_drops));
1da177e4
LT		 1395}
1396
ba4e58ec 1397int udp6_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 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"
cb61cb9b 1405 " uid timeout inode ref pointer drops\n");
1da177e4
LT		 1406 else
1407 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1408 return 0;
1409}
1410
73cb88ec
AV		 1411static 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
1da177e4 1419static struct udp_seq_afinfo udp6_seq_afinfo = {
1da177e4
LT		 1420 .name = "udp6",
1421 .family = AF_INET6,
645ca708 1422 .udp_table = &udp_table,
73cb88ec 1423 .seq_fops = &udp6_afinfo_seq_fops,
dda61925
DL		 1424 .seq_ops = {
1425 .show = udp6_seq_show,
1426 },
1da177e4
LT		 1427};
1428
2c8c1e72 1429int __net_init udp6_proc_init(struct net *net)
1da177e4 1430{
0c96d8c5 1431 return udp_proc_register(net, &udp6_seq_afinfo);
1da177e4
LT		 1432}
1433
0c96d8c5
DL		 1434void udp6_proc_exit(struct net *net) {
1435 udp_proc_unregister(net, &udp6_seq_afinfo);
1da177e4
LT		 1436}
1437#endif /* CONFIG_PROC_FS */
1438
f77d6021
ED		 1439void 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
1da177e4
LT		 1450/* ------------------------------------------------------------------------ */
1451
1452struct proto udpv6_prot = {
543d9cfe
ACM		 1453 .name = "UDPv6",
1454 .owner = THIS_MODULE,
ba4e58ec 1455 .close = udp_lib_close,
543d9cfe
ACM		 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,
f7ad74fe 1464 .backlog_rcv = __udpv6_queue_rcv_skb,
ba4e58ec
GR		 1465 .hash = udp_lib_hash,
1466 .unhash = udp_lib_unhash,
719f8358 1467 .rehash = udp_v6_rehash,
543d9cfe 1468 .get_port = udp_v6_get_port,
95766fff
HA		 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,
543d9cfe 1473 .obj_size = sizeof(struct udp6_sock),
271b72c7 1474 .slab_flags = SLAB_DESTROY_BY_RCU,
645ca708 1475 .h.udp_table = &udp_table,
3fdadf7d 1476#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1477 .compat_setsockopt = compat_udpv6_setsockopt,
1478 .compat_getsockopt = compat_udpv6_getsockopt,
3fdadf7d 1479#endif
f77d6021 1480 .clear_sk = udp_v6_clear_sk,
1da177e4
LT		 1481};
1482
1da177e4
LT		 1483static struct inet_protosw udpv6_protosw = {
1484 .type = SOCK_DGRAM,
1485 .protocol = IPPROTO_UDP,
1486 .prot = &udpv6_prot,
1487 .ops = &inet6_dgram_ops,
1da177e4
LT		 1488 .no_check = UDP_CSUM_DEFAULT,
1489 .flags = INET_PROTOSW_PERMANENT,
1490};
1491
1492
7f4e4868 1493int __init udpv6_init(void)
1da177e4 1494{
7f4e4868
DL		 1495 int ret;
1496
3336288a
VY		 1497 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1498 if (ret)
c6b641a4 1499 goto out;
3336288a 1500
7f4e4868
DL		 1501 ret = inet6_register_protosw(&udpv6_protosw);
1502 if (ret)
1503 goto out_udpv6_protocol;
1504out:
1505 return ret;
1506
1507out_udpv6_protocol:
1508 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1509 goto out;
1510}
1511
09f7709f 1512void udpv6_exit(void)
7f4e4868
DL		 1513{
1514 inet6_unregister_protosw(&udpv6_protosw);
1515 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1da177e4 1516}
kernel source for telekom puls (alcatel/mediatek)