Commit | Line | Data |
---|---|---|
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 | ||
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
72289b96 | 49 | #include <net/inet6_hashtables.h> |
076bb0c8 | 50 | #include <net/busy_poll.h> |
e32ea7e7 | 51 | #include <net/sock_reuseport.h> |
1da177e4 LT |
52 | |
53 | #include <linux/proc_fs.h> | |
54 | #include <linux/seq_file.h> | |
22911fc5 | 55 | #include <trace/events/skb.h> |
ba4e58ec | 56 | #include "udp_impl.h" |
1da177e4 | 57 | |
6eada011 ED |
58 | static u32 udp6_ehashfn(const struct net *net, |
59 | const struct in6_addr *laddr, | |
60 | const u16 lport, | |
61 | const struct in6_addr *faddr, | |
62 | const __be16 fport) | |
b50026b5 | 63 | { |
1bbdceef HFS |
64 | static u32 udp6_ehash_secret __read_mostly; |
65 | static u32 udp_ipv6_hash_secret __read_mostly; | |
66 | ||
67 | u32 lhash, fhash; | |
68 | ||
69 | net_get_random_once(&udp6_ehash_secret, | |
70 | sizeof(udp6_ehash_secret)); | |
71 | net_get_random_once(&udp_ipv6_hash_secret, | |
72 | sizeof(udp_ipv6_hash_secret)); | |
73 | ||
74 | lhash = (__force u32)laddr->s6_addr32[3]; | |
75 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
76 | ||
b50026b5 | 77 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 78 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
79 | } |
80 | ||
6eada011 ED |
81 | static u32 udp6_portaddr_hash(const struct net *net, |
82 | const struct in6_addr *addr6, | |
83 | unsigned int port) | |
d4cada4a ED |
84 | { |
85 | unsigned int hash, mix = net_hash_mix(net); | |
86 | ||
87 | if (ipv6_addr_any(addr6)) | |
88 | hash = jhash_1word(0, mix); | |
856540ee | 89 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 90 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 91 | else |
0eae88f3 | 92 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
93 | |
94 | return hash ^ port; | |
95 | } | |
96 | ||
6ba5a3c5 | 97 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 98 | { |
30fff923 ED |
99 | unsigned int hash2_nulladdr = |
100 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 101 | unsigned int hash2_partial = |
efe4208f | 102 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 103 | |
d4cada4a | 104 | /* precompute partial secondary hash */ |
30fff923 ED |
105 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
106 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
107 | } |
108 | ||
719f8358 ED |
109 | static void udp_v6_rehash(struct sock *sk) |
110 | { | |
111 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 112 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
113 | inet_sk(sk)->inet_num); |
114 | ||
115 | udp_lib_rehash(sk, new_hash); | |
116 | } | |
117 | ||
645ca708 ED |
118 | static inline int compute_score(struct sock *sk, struct net *net, |
119 | unsigned short hnum, | |
88440ae7 BS |
120 | const struct in6_addr *saddr, __be16 sport, |
121 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
122 | int dif) |
123 | { | |
60c04aec JP |
124 | int score; |
125 | struct inet_sock *inet; | |
126 | ||
127 | if (!net_eq(sock_net(sk), net) || | |
128 | udp_sk(sk)->udp_port_hash != hnum || | |
129 | sk->sk_family != PF_INET6) | |
130 | return -1; | |
131 | ||
132 | score = 0; | |
133 | inet = inet_sk(sk); | |
134 | ||
135 | if (inet->inet_dport) { | |
136 | if (inet->inet_dport != sport) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | ||
141 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
142 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
143 | return -1; | |
144 | score++; | |
145 | } | |
146 | ||
147 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
148 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
149 | return -1; | |
150 | score++; | |
151 | } | |
152 | ||
153 | if (sk->sk_bound_dev_if) { | |
154 | if (sk->sk_bound_dev_if != dif) | |
155 | return -1; | |
156 | score++; | |
645ca708 | 157 | } |
60c04aec | 158 | |
70da268b ED |
159 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
160 | score++; | |
161 | ||
645ca708 ED |
162 | return score; |
163 | } | |
164 | ||
fddc17de | 165 | static inline int compute_score2(struct sock *sk, struct net *net, |
60c04aec JP |
166 | const struct in6_addr *saddr, __be16 sport, |
167 | const struct in6_addr *daddr, | |
168 | unsigned short hnum, int dif) | |
fddc17de | 169 | { |
60c04aec JP |
170 | int score; |
171 | struct inet_sock *inet; | |
fddc17de | 172 | |
60c04aec JP |
173 | if (!net_eq(sock_net(sk), net) || |
174 | udp_sk(sk)->udp_port_hash != hnum || | |
175 | sk->sk_family != PF_INET6) | |
176 | return -1; | |
fddc17de | 177 | |
60c04aec JP |
178 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
179 | return -1; | |
180 | ||
181 | score = 0; | |
182 | inet = inet_sk(sk); | |
183 | ||
184 | if (inet->inet_dport) { | |
185 | if (inet->inet_dport != sport) | |
186 | return -1; | |
187 | score++; | |
188 | } | |
189 | ||
190 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
191 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de | 192 | return -1; |
60c04aec | 193 | score++; |
fddc17de | 194 | } |
60c04aec JP |
195 | |
196 | if (sk->sk_bound_dev_if) { | |
197 | if (sk->sk_bound_dev_if != dif) | |
198 | return -1; | |
199 | score++; | |
200 | } | |
201 | ||
70da268b ED |
202 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
203 | score++; | |
204 | ||
fddc17de ED |
205 | return score; |
206 | } | |
207 | ||
fddc17de ED |
208 | /* called with read_rcu_lock() */ |
209 | static struct sock *udp6_lib_lookup2(struct net *net, | |
210 | const struct in6_addr *saddr, __be16 sport, | |
211 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
1134158b CG |
212 | struct udp_hslot *hslot2, unsigned int slot2, |
213 | struct sk_buff *skb) | |
fddc17de ED |
214 | { |
215 | struct sock *sk, *result; | |
216 | struct hlist_nulls_node *node; | |
72289b96 | 217 | int score, badness, matches = 0, reuseport = 0; |
ed0dfffd | 218 | bool select_ok = true; |
72289b96 | 219 | u32 hash = 0; |
fddc17de ED |
220 | |
221 | begin: | |
222 | result = NULL; | |
223 | badness = -1; | |
224 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
225 | score = compute_score2(sk, net, saddr, sport, | |
226 | daddr, hnum, dif); | |
227 | if (score > badness) { | |
228 | result = sk; | |
229 | badness = score; | |
72289b96 TH |
230 | reuseport = sk->sk_reuseport; |
231 | if (reuseport) { | |
b50026b5 HFS |
232 | hash = udp6_ehashfn(net, daddr, hnum, |
233 | saddr, sport); | |
ed0dfffd ED |
234 | if (select_ok) { |
235 | struct sock *sk2; | |
236 | ||
237 | sk2 = reuseport_select_sock(sk, hash, skb, | |
238 | sizeof(struct udphdr)); | |
239 | if (sk2) { | |
240 | result = sk2; | |
241 | select_ok = false; | |
242 | goto found; | |
243 | } | |
e32ea7e7 | 244 | } |
72289b96 | 245 | matches = 1; |
70da268b | 246 | } |
72289b96 TH |
247 | } else if (score == badness && reuseport) { |
248 | matches++; | |
8fc54f68 | 249 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
250 | result = sk; |
251 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
252 | } |
253 | } | |
254 | /* | |
255 | * if the nulls value we got at the end of this lookup is | |
256 | * not the expected one, we must restart lookup. | |
257 | * We probably met an item that was moved to another chain. | |
258 | */ | |
259 | if (get_nulls_value(node) != slot2) | |
260 | goto begin; | |
261 | ||
262 | if (result) { | |
e32ea7e7 | 263 | found: |
c31504dc | 264 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
265 | result = NULL; |
266 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
267 | daddr, hnum, dif) < badness)) { | |
268 | sock_put(result); | |
269 | goto begin; | |
270 | } | |
271 | } | |
272 | return result; | |
273 | } | |
274 | ||
fce82338 | 275 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
276 | const struct in6_addr *saddr, __be16 sport, |
277 | const struct in6_addr *daddr, __be16 dport, | |
538950a1 CG |
278 | int dif, struct udp_table *udptable, |
279 | struct sk_buff *skb) | |
1da177e4 | 280 | { |
271b72c7 | 281 | struct sock *sk, *result; |
88ab1932 | 282 | struct hlist_nulls_node *node; |
1da177e4 | 283 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
284 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
285 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 | 286 | int score, badness, matches = 0, reuseport = 0; |
ed0dfffd | 287 | bool select_ok = true; |
72289b96 | 288 | u32 hash = 0; |
645ca708 | 289 | |
271b72c7 | 290 | rcu_read_lock(); |
fddc17de ED |
291 | if (hslot->count > 10) { |
292 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
293 | slot2 = hash2 & udptable->mask; | |
294 | hslot2 = &udptable->hash2[slot2]; | |
295 | if (hslot->count < hslot2->count) | |
296 | goto begin; | |
297 | ||
298 | result = udp6_lib_lookup2(net, saddr, sport, | |
299 | daddr, hnum, dif, | |
1134158b | 300 | hslot2, slot2, skb); |
fddc17de ED |
301 | if (!result) { |
302 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
303 | slot2 = hash2 & udptable->mask; | |
304 | hslot2 = &udptable->hash2[slot2]; | |
305 | if (hslot->count < hslot2->count) | |
306 | goto begin; | |
307 | ||
1223c67c JBD |
308 | result = udp6_lib_lookup2(net, saddr, sport, |
309 | &in6addr_any, hnum, dif, | |
1134158b | 310 | hslot2, slot2, skb); |
fddc17de ED |
311 | } |
312 | rcu_read_unlock(); | |
313 | return result; | |
314 | } | |
271b72c7 ED |
315 | begin: |
316 | result = NULL; | |
317 | badness = -1; | |
88ab1932 | 318 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
319 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
320 | if (score > badness) { | |
321 | result = sk; | |
322 | badness = score; | |
72289b96 TH |
323 | reuseport = sk->sk_reuseport; |
324 | if (reuseport) { | |
b50026b5 HFS |
325 | hash = udp6_ehashfn(net, daddr, hnum, |
326 | saddr, sport); | |
ed0dfffd ED |
327 | if (select_ok) { |
328 | struct sock *sk2; | |
329 | ||
330 | sk2 = reuseport_select_sock(sk, hash, skb, | |
538950a1 | 331 | sizeof(struct udphdr)); |
ed0dfffd ED |
332 | if (sk2) { |
333 | result = sk2; | |
334 | select_ok = false; | |
335 | goto found; | |
336 | } | |
e32ea7e7 | 337 | } |
72289b96 TH |
338 | matches = 1; |
339 | } | |
340 | } else if (score == badness && reuseport) { | |
341 | matches++; | |
8fc54f68 | 342 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
343 | result = sk; |
344 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
345 | } |
346 | } | |
88ab1932 ED |
347 | /* |
348 | * if the nulls value we got at the end of this lookup is | |
349 | * not the expected one, we must restart lookup. | |
350 | * We probably met an item that was moved to another chain. | |
351 | */ | |
fddc17de | 352 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
353 | goto begin; |
354 | ||
271b72c7 | 355 | if (result) { |
e32ea7e7 | 356 | found: |
c31504dc | 357 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
358 | result = NULL; |
359 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
360 | daddr, dport, dif) < badness)) { | |
361 | sock_put(result); | |
362 | goto begin; | |
363 | } | |
364 | } | |
365 | rcu_read_unlock(); | |
1da177e4 LT |
366 | return result; |
367 | } | |
fce82338 | 368 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 369 | |
607c4aaf KK |
370 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
371 | __be16 sport, __be16 dport, | |
645ca708 | 372 | struct udp_table *udptable) |
607c4aaf | 373 | { |
23542618 | 374 | struct sock *sk; |
b71d1d42 | 375 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 376 | |
e5d08d71 IM |
377 | sk = skb_steal_sock(skb); |
378 | if (unlikely(sk)) | |
23542618 | 379 | return sk; |
adf30907 ED |
380 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
381 | &iph->daddr, dport, inet6_iif(skb), | |
538950a1 | 382 | udptable, skb); |
607c4aaf KK |
383 | } |
384 | ||
aa976fc0 BS |
385 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
386 | const struct in6_addr *daddr, __be16 dport, int dif) | |
387 | { | |
538950a1 | 388 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL); |
aa976fc0 BS |
389 | } |
390 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
391 | ||
1da177e4 | 392 | /* |
67ba4152 IM |
393 | * This should be easy, if there is something there we |
394 | * return it, otherwise we block. | |
1da177e4 LT |
395 | */ |
396 | ||
1b784140 | 397 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
398 | int noblock, int flags, int *addr_len) |
399 | { | |
400 | struct ipv6_pinfo *np = inet6_sk(sk); | |
401 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 402 | struct sk_buff *skb; |
59c2cdae | 403 | unsigned int ulen, copied; |
3f518bf7 | 404 | int peeked, off = 0; |
759e5d00 HX |
405 | int err; |
406 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 407 | bool checksum_valid = false; |
f26ba175 | 408 | int is_udp4; |
8a74ad60 | 409 | bool slow; |
1da177e4 | 410 | |
1da177e4 | 411 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 412 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 413 | |
4b340ae2 | 414 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 415 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 416 | |
1da177e4 | 417 | try_again: |
a59322be | 418 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 419 | &peeked, &off, &err); |
1da177e4 LT |
420 | if (!skb) |
421 | goto out; | |
422 | ||
759e5d00 | 423 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
424 | copied = len; |
425 | if (copied > ulen) | |
426 | copied = ulen; | |
427 | else if (copied < ulen) | |
1ab1457c | 428 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 429 | |
f26ba175 WY |
430 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
431 | ||
ba4e58ec | 432 | /* |
759e5d00 HX |
433 | * If checksum is needed at all, try to do it while copying the |
434 | * data. If the data is truncated, or if we only want a partial | |
435 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 436 | */ |
ba4e58ec | 437 | |
59c2cdae | 438 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
197c949e ED |
439 | checksum_valid = !udp_lib_checksum_complete(skb); |
440 | if (!checksum_valid) | |
1da177e4 | 441 | goto csum_copy_err; |
ba4e58ec GR |
442 | } |
443 | ||
197c949e | 444 | if (checksum_valid || skb_csum_unnecessary(skb)) |
51f3d02b DM |
445 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
446 | msg, copied); | |
ba4e58ec | 447 | else { |
227158db | 448 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); |
1da177e4 LT |
449 | if (err == -EINVAL) |
450 | goto csum_copy_err; | |
451 | } | |
22911fc5 ED |
452 | if (unlikely(err)) { |
453 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
454 | if (!peeked) { |
455 | atomic_inc(&sk->sk_drops); | |
456 | if (is_udp4) | |
457 | UDP_INC_STATS_USER(sock_net(sk), | |
458 | UDP_MIB_INERRORS, | |
459 | is_udplite); | |
460 | else | |
461 | UDP6_INC_STATS_USER(sock_net(sk), | |
462 | UDP_MIB_INERRORS, | |
463 | is_udplite); | |
464 | } | |
1da177e4 | 465 | goto out_free; |
22911fc5 | 466 | } |
f26ba175 WY |
467 | if (!peeked) { |
468 | if (is_udp4) | |
469 | UDP_INC_STATS_USER(sock_net(sk), | |
470 | UDP_MIB_INDATAGRAMS, is_udplite); | |
471 | else | |
472 | UDP6_INC_STATS_USER(sock_net(sk), | |
473 | UDP_MIB_INDATAGRAMS, is_udplite); | |
474 | } | |
cb75994e | 475 | |
3b885787 | 476 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
477 | |
478 | /* Copy the address. */ | |
479 | if (msg->msg_name) { | |
342dfc30 | 480 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 481 | sin6->sin6_family = AF_INET6; |
4bedb452 | 482 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 483 | sin6->sin6_flowinfo = 0; |
1da177e4 | 484 | |
842df073 | 485 | if (is_udp4) { |
b301e82c BH |
486 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
487 | &sin6->sin6_addr); | |
842df073 HFS |
488 | sin6->sin6_scope_id = 0; |
489 | } else { | |
4e3fd7a0 | 490 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
491 | sin6->sin6_scope_id = |
492 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 493 | inet6_iif(skb)); |
1da177e4 | 494 | } |
bceaa902 | 495 | *addr_len = sizeof(*sin6); |
1da177e4 | 496 | } |
4b261c75 HFS |
497 | |
498 | if (np->rxopt.all) | |
499 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
500 | ||
f26ba175 | 501 | if (is_udp4) { |
1da177e4 LT |
502 | if (inet->cmsg_flags) |
503 | ip_cmsg_recv(msg, skb); | |
504 | } else { | |
505 | if (np->rxopt.all) | |
4b261c75 | 506 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 507 | } |
1da177e4 | 508 | |
59c2cdae | 509 | err = copied; |
1da177e4 | 510 | if (flags & MSG_TRUNC) |
759e5d00 | 511 | err = ulen; |
1da177e4 LT |
512 | |
513 | out_free: | |
9d410c79 | 514 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
515 | out: |
516 | return err; | |
517 | ||
518 | csum_copy_err: | |
8a74ad60 | 519 | slow = lock_sock_fast(sk); |
0856f939 | 520 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
521 | if (is_udp4) { |
522 | UDP_INC_STATS_USER(sock_net(sk), | |
523 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
524 | UDP_INC_STATS_USER(sock_net(sk), |
525 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
526 | } else { |
527 | UDP6_INC_STATS_USER(sock_net(sk), | |
528 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
529 | UDP6_INC_STATS_USER(sock_net(sk), |
530 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 531 | } |
0856f939 | 532 | } |
8a74ad60 | 533 | unlock_sock_fast(sk, slow); |
1da177e4 | 534 | |
beb39db5 ED |
535 | /* starting over for a new packet, but check if we need to yield */ |
536 | cond_resched(); | |
9cfaa8de | 537 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
538 | goto try_again; |
539 | } | |
540 | ||
ba4e58ec | 541 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 542 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 543 | struct udp_table *udptable) |
1da177e4 LT |
544 | { |
545 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
546 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
547 | const struct in6_addr *saddr = &hdr->saddr; | |
548 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 549 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 550 | struct sock *sk; |
e0d8c1b7 | 551 | int harderr; |
1da177e4 | 552 | int err; |
7304fe46 | 553 | struct net *net = dev_net(skb->dev); |
1da177e4 | 554 | |
e32ea7e7 | 555 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 556 | inet6_iif(skb), udptable, skb); |
63159f29 | 557 | if (!sk) { |
7304fe46 DJ |
558 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
559 | ICMP6_MIB_INERRORS); | |
1da177e4 | 560 | return; |
7304fe46 | 561 | } |
1da177e4 | 562 | |
e0d8c1b7 WW |
563 | harderr = icmpv6_err_convert(type, code, &err); |
564 | np = inet6_sk(sk); | |
565 | ||
93b36cf3 HFS |
566 | if (type == ICMPV6_PKT_TOOBIG) { |
567 | if (!ip6_sk_accept_pmtu(sk)) | |
568 | goto out; | |
81aded24 | 569 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
570 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
571 | harderr = 1; | |
93b36cf3 | 572 | } |
1a462d18 | 573 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 574 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
575 | goto out; |
576 | } | |
81aded24 | 577 | |
e0d8c1b7 WW |
578 | if (!np->recverr) { |
579 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
580 | goto out; | |
581 | } else { | |
1da177e4 | 582 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 583 | } |
b1faf566 | 584 | |
1da177e4 LT |
585 | sk->sk_err = err; |
586 | sk->sk_error_report(sk); | |
587 | out: | |
588 | sock_put(sk); | |
589 | } | |
590 | ||
f7ad74fe BL |
591 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
592 | { | |
593 | int rc; | |
594 | ||
efe4208f | 595 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 596 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 597 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 598 | sk_incoming_cpu_update(sk); |
005ec974 | 599 | } |
f7ad74fe BL |
600 | |
601 | rc = sock_queue_rcv_skb(sk, skb); | |
602 | if (rc < 0) { | |
603 | int is_udplite = IS_UDPLITE(sk); | |
604 | ||
605 | /* Note that an ENOMEM error is charged twice */ | |
606 | if (rc == -ENOMEM) | |
607 | UDP6_INC_STATS_BH(sock_net(sk), | |
608 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
609 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
610 | kfree_skb(skb); | |
611 | return -1; | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | ||
ba4e58ec | 616 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 617 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 618 | u8 code, int offset, __be32 info) |
ba4e58ec | 619 | { |
645ca708 | 620 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
621 | } |
622 | ||
d7f3f621 BL |
623 | static struct static_key udpv6_encap_needed __read_mostly; |
624 | void udpv6_encap_enable(void) | |
625 | { | |
626 | if (!static_key_enabled(&udpv6_encap_needed)) | |
627 | static_key_slow_inc(&udpv6_encap_needed); | |
628 | } | |
629 | EXPORT_SYMBOL(udpv6_encap_enable); | |
630 | ||
f7ad74fe | 631 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 632 | { |
ba4e58ec | 633 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 634 | int rc; |
b2bf1e26 | 635 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 636 | |
ba4e58ec GR |
637 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
638 | goto drop; | |
1da177e4 | 639 | |
d7f3f621 BL |
640 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
641 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
642 | ||
643 | /* | |
644 | * This is an encapsulation socket so pass the skb to | |
645 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
646 | * fall through and pass this up the UDP socket. | |
647 | * up->encap_rcv() returns the following value: | |
648 | * =0 if skb was successfully passed to the encap | |
649 | * handler or was discarded by it. | |
650 | * >0 if skb should be passed on to UDP. | |
651 | * <0 if skb should be resubmitted as proto -N | |
652 | */ | |
653 | ||
654 | /* if we're overly short, let UDP handle it */ | |
655 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 656 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
657 | int ret; |
658 | ||
0a80966b TH |
659 | /* Verify checksum before giving to encap */ |
660 | if (udp_lib_checksum_complete(skb)) | |
661 | goto csum_error; | |
662 | ||
d7f3f621 BL |
663 | ret = encap_rcv(sk, skb); |
664 | if (ret <= 0) { | |
665 | UDP_INC_STATS_BH(sock_net(sk), | |
666 | UDP_MIB_INDATAGRAMS, | |
667 | is_udplite); | |
668 | return -ret; | |
669 | } | |
670 | } | |
671 | ||
672 | /* FALLTHROUGH -- it's a UDP Packet */ | |
673 | } | |
674 | ||
ba4e58ec GR |
675 | /* |
676 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
677 | */ | |
b2bf1e26 | 678 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
679 | |
680 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
681 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
682 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
683 | goto drop; |
684 | } | |
685 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
686 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
687 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
688 | goto drop; |
689 | } | |
1da177e4 LT |
690 | } |
691 | ||
33d480ce | 692 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 693 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 694 | goto csum_error; |
1ab6eb62 | 695 | } |
ba4e58ec | 696 | |
274f482d | 697 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
3e215c8d JL |
698 | UDP6_INC_STATS_BH(sock_net(sk), |
699 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 700 | goto drop; |
3e215c8d | 701 | } |
cb80ef46 | 702 | |
d826eb14 | 703 | skb_dst_drop(skb); |
cb75994e | 704 | |
cb80ef46 BL |
705 | bh_lock_sock(sk); |
706 | rc = 0; | |
707 | if (!sock_owned_by_user(sk)) | |
708 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
709 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
710 | bh_unlock_sock(sk); | |
711 | goto drop; | |
712 | } | |
713 | bh_unlock_sock(sk); | |
f7ad74fe BL |
714 | |
715 | return rc; | |
3e215c8d | 716 | |
6a5dc9e5 ED |
717 | csum_error: |
718 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 719 | drop: |
ef28d1a2 | 720 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 721 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
722 | kfree_skb(skb); |
723 | return -1; | |
1da177e4 LT |
724 | } |
725 | ||
5cf3d461 DH |
726 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
727 | __be16 loc_port, const struct in6_addr *loc_addr, | |
728 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
729 | int dif, unsigned short hnum) | |
1da177e4 | 730 | { |
5cf3d461 | 731 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 732 | |
5cf3d461 DH |
733 | if (!net_eq(sock_net(sk), net)) |
734 | return false; | |
735 | ||
736 | if (udp_sk(sk)->udp_port_hash != hnum || | |
737 | sk->sk_family != PF_INET6 || | |
738 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
739 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
740 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
741 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
742 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
743 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
744 | return false; |
745 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
746 | return false; | |
747 | return true; | |
1da177e4 LT |
748 | } |
749 | ||
a1ab77f9 ED |
750 | static void flush_stack(struct sock **stack, unsigned int count, |
751 | struct sk_buff *skb, unsigned int final) | |
752 | { | |
cb80ef46 | 753 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 754 | struct sock *sk; |
cb80ef46 | 755 | unsigned int i; |
a1ab77f9 ED |
756 | |
757 | for (i = 0; i < count; i++) { | |
f6b8f32c | 758 | sk = stack[i]; |
63159f29 | 759 | if (likely(!skb1)) |
cb80ef46 BL |
760 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
761 | if (!skb1) { | |
762 | atomic_inc(&sk->sk_drops); | |
763 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
764 | IS_UDPLITE(sk)); | |
765 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
766 | IS_UDPLITE(sk)); | |
a1ab77f9 | 767 | } |
cb80ef46 BL |
768 | |
769 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
770 | skb1 = NULL; | |
2dc41cff | 771 | sock_put(sk); |
a1ab77f9 | 772 | } |
cb80ef46 BL |
773 | if (unlikely(skb1)) |
774 | kfree_skb(skb1); | |
a1ab77f9 | 775 | } |
4068579e TH |
776 | |
777 | static void udp6_csum_zero_error(struct sk_buff *skb) | |
778 | { | |
779 | /* RFC 2460 section 8.1 says that we SHOULD log | |
780 | * this error. Well, it is reasonable. | |
781 | */ | |
ba7a46f1 JP |
782 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
783 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
784 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
785 | } |
786 | ||
1da177e4 LT |
787 | /* |
788 | * Note: called only from the BH handler context, | |
789 | * so we don't need to lock the hashes. | |
790 | */ | |
e3163493 | 791 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 792 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 793 | struct udp_table *udptable, int proto) |
1da177e4 | 794 | { |
a1ab77f9 | 795 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 796 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
797 | struct hlist_nulls_node *node; |
798 | unsigned short hnum = ntohs(uh->dest); | |
799 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
800 | int dif = inet6_iif(skb); | |
2dc41cff DH |
801 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
802 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); | |
36cbb245 | 803 | bool inner_flushed = false; |
2dc41cff DH |
804 | |
805 | if (use_hash2) { | |
806 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
807 | udp_table.mask; | |
808 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
809 | start_lookup: | |
810 | hslot = &udp_table.hash2[hash2]; | |
811 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
812 | } | |
1da177e4 | 813 | |
645ca708 | 814 | spin_lock(&hslot->lock); |
2dc41cff | 815 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
5cf3d461 DH |
816 | if (__udp_v6_is_mcast_sock(net, sk, |
817 | uh->dest, daddr, | |
818 | uh->source, saddr, | |
819 | dif, hnum) && | |
820 | /* If zero checksum and no_check is not on for | |
821 | * the socket then skip it. | |
822 | */ | |
823 | (uh->check || udp_sk(sk)->no_check6_rx)) { | |
824 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
825 | flush_stack(stack, count, skb, ~0); | |
36cbb245 | 826 | inner_flushed = true; |
5cf3d461 DH |
827 | count = 0; |
828 | } | |
4068579e | 829 | stack[count++] = sk; |
2dc41cff | 830 | sock_hold(sk); |
95766fff | 831 | } |
1da177e4 | 832 | } |
a1ab77f9 | 833 | |
645ca708 | 834 | spin_unlock(&hslot->lock); |
a1ab77f9 | 835 | |
2dc41cff DH |
836 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
837 | if (use_hash2 && hash2 != hash2_any) { | |
838 | hash2 = hash2_any; | |
839 | goto start_lookup; | |
840 | } | |
841 | ||
a1ab77f9 ED |
842 | if (count) { |
843 | flush_stack(stack, count, skb, count - 1); | |
a1ab77f9 | 844 | } else { |
36cbb245 RJ |
845 | if (!inner_flushed) |
846 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, | |
847 | proto == IPPROTO_UDPLITE); | |
848 | consume_skb(skb); | |
a1ab77f9 | 849 | } |
ba4e58ec | 850 | return 0; |
1da177e4 LT |
851 | } |
852 | ||
645ca708 | 853 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 854 | int proto) |
1da177e4 | 855 | { |
3ffe533c | 856 | struct net *net = dev_net(skb->dev); |
1da177e4 | 857 | struct sock *sk; |
1ab1457c | 858 | struct udphdr *uh; |
b71d1d42 | 859 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
860 | u32 ulen = 0; |
861 | ||
862 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 863 | goto discard; |
1da177e4 | 864 | |
0660e03f ACM |
865 | saddr = &ipv6_hdr(skb)->saddr; |
866 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 867 | uh = udp_hdr(skb); |
1da177e4 LT |
868 | |
869 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
870 | if (ulen > skb->len) |
871 | goto short_packet; | |
1da177e4 | 872 | |
759e5d00 HX |
873 | if (proto == IPPROTO_UDP) { |
874 | /* UDP validates ulen. */ | |
1da177e4 | 875 | |
ba4e58ec GR |
876 | /* Check for jumbo payload */ |
877 | if (ulen == 0) | |
878 | ulen = skb->len; | |
1da177e4 | 879 | |
ba4e58ec GR |
880 | if (ulen < sizeof(*uh)) |
881 | goto short_packet; | |
1da177e4 | 882 | |
ba4e58ec GR |
883 | if (ulen < skb->len) { |
884 | if (pskb_trim_rcsum(skb, ulen)) | |
885 | goto short_packet; | |
0660e03f ACM |
886 | saddr = &ipv6_hdr(skb)->saddr; |
887 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 888 | uh = udp_hdr(skb); |
ba4e58ec | 889 | } |
ba4e58ec | 890 | } |
1da177e4 | 891 | |
759e5d00 | 892 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 893 | goto csum_error; |
759e5d00 | 894 | |
1ab1457c YH |
895 | /* |
896 | * Multicast receive code | |
1da177e4 | 897 | */ |
ba4e58ec | 898 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 899 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 900 | saddr, daddr, udptable, proto); |
1da177e4 LT |
901 | |
902 | /* Unicast */ | |
903 | ||
1ab1457c | 904 | /* |
1da177e4 LT |
905 | * check socket cache ... must talk to Alan about his plans |
906 | * for sock caches... i'll skip this for now. | |
907 | */ | |
607c4aaf | 908 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 909 | if (sk) { |
a5b50476 ET |
910 | int ret; |
911 | ||
1c19448c | 912 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
79e0f1c9 | 913 | sock_put(sk); |
4068579e TH |
914 | udp6_csum_zero_error(skb); |
915 | goto csum_error; | |
916 | } | |
917 | ||
224d019c | 918 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
919 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
920 | ip6_compute_pseudo); | |
921 | ||
a5b50476 | 922 | ret = udpv6_queue_rcv_skb(sk, skb); |
cb80ef46 | 923 | sock_put(sk); |
1da177e4 | 924 | |
59dca1d8 | 925 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 926 | if (ret > 0) |
59dca1d8 | 927 | return ret; |
1da177e4 | 928 | |
add459aa | 929 | return 0; |
1da177e4 | 930 | } |
1ab1457c | 931 | |
4068579e TH |
932 | if (!uh->check) { |
933 | udp6_csum_zero_error(skb); | |
934 | goto csum_error; | |
935 | } | |
936 | ||
cb80ef46 | 937 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 938 | goto discard; |
cb80ef46 BL |
939 | |
940 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 941 | goto csum_error; |
cb80ef46 BL |
942 | |
943 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
944 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
945 | ||
946 | kfree_skb(skb); | |
add459aa | 947 | return 0; |
1da177e4 | 948 | |
1ab1457c | 949 | short_packet: |
ba7a46f1 JP |
950 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
951 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
952 | saddr, ntohs(uh->source), | |
953 | ulen, skb->len, | |
954 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
955 | goto discard; |
956 | csum_error: | |
957 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 958 | discard: |
ef28d1a2 | 959 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 960 | kfree_skb(skb); |
add459aa | 961 | return 0; |
1da177e4 | 962 | } |
ba4e58ec | 963 | |
e5bbef20 | 964 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 965 | { |
645ca708 | 966 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
967 | } |
968 | ||
1da177e4 LT |
969 | /* |
970 | * Throw away all pending data and cancel the corking. Socket is locked. | |
971 | */ | |
972 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
973 | { | |
974 | struct udp_sock *up = udp_sk(sk); | |
975 | ||
36d926b9 DL |
976 | if (up->pending == AF_INET) |
977 | udp_flush_pending_frames(sk); | |
978 | else if (up->pending) { | |
1da177e4 LT |
979 | up->len = 0; |
980 | up->pending = 0; | |
981 | ip6_flush_pending_frames(sk); | |
1ab1457c | 982 | } |
1da177e4 LT |
983 | } |
984 | ||
493c6be3 | 985 | /** |
67ba4152 IM |
986 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
987 | * @sk: socket we are sending on | |
988 | * @skb: sk_buff containing the filled-in UDP header | |
989 | * (checksum field must be zeroed out) | |
493c6be3 SS |
990 | */ |
991 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
992 | const struct in6_addr *saddr, | |
993 | const struct in6_addr *daddr, int len) | |
994 | { | |
995 | unsigned int offset; | |
996 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 997 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
998 | __wsum csum = 0; |
999 | ||
d39d938c | 1000 | if (!frags) { |
493c6be3 SS |
1001 | /* Only one fragment on the socket. */ |
1002 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1003 | skb->csum_offset = offsetof(struct udphdr, check); | |
1004 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1005 | } else { | |
1006 | /* | |
1007 | * HW-checksum won't work as there are two or more | |
1008 | * fragments on the socket so that all csums of sk_buffs | |
1009 | * should be together | |
1010 | */ | |
1011 | offset = skb_transport_offset(skb); | |
1012 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1013 | ||
1014 | skb->ip_summed = CHECKSUM_NONE; | |
1015 | ||
d39d938c VY |
1016 | do { |
1017 | csum = csum_add(csum, frags->csum); | |
1018 | } while ((frags = frags->next)); | |
493c6be3 SS |
1019 | |
1020 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1021 | csum); | |
1022 | if (uh->check == 0) | |
1023 | uh->check = CSUM_MANGLED_0; | |
1024 | } | |
1025 | } | |
1026 | ||
1da177e4 LT |
1027 | /* |
1028 | * Sending | |
1029 | */ | |
1030 | ||
d39d938c | 1031 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 1032 | { |
d39d938c | 1033 | struct sock *sk = skb->sk; |
1da177e4 | 1034 | struct udphdr *uh; |
1da177e4 | 1035 | int err = 0; |
b2bf1e26 | 1036 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1037 | __wsum csum = 0; |
d39d938c VY |
1038 | int offset = skb_transport_offset(skb); |
1039 | int len = skb->len - offset; | |
1da177e4 LT |
1040 | |
1041 | /* | |
1042 | * Create a UDP header | |
1043 | */ | |
4bedb452 | 1044 | uh = udp_hdr(skb); |
1958b856 DM |
1045 | uh->source = fl6->fl6_sport; |
1046 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1047 | uh->len = htons(len); |
1da177e4 LT |
1048 | uh->check = 0; |
1049 | ||
b2bf1e26 | 1050 | if (is_udplite) |
d39d938c VY |
1051 | csum = udplite_csum(skb); |
1052 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1053 | skb->ip_summed = CHECKSUM_NONE; |
1054 | goto send; | |
1055 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1056 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1057 | goto send; |
1058 | } else | |
d39d938c | 1059 | csum = udp_csum(skb); |
1da177e4 | 1060 | |
ba4e58ec | 1061 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1062 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1063 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1064 | if (uh->check == 0) |
f6ab0288 | 1065 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1066 | |
493c6be3 | 1067 | send: |
d39d938c | 1068 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1069 | if (err) { |
1070 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1071 | UDP6_INC_STATS_USER(sock_net(sk), | |
1072 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1073 | err = 0; | |
1074 | } | |
1075 | } else | |
1076 | UDP6_INC_STATS_USER(sock_net(sk), | |
1077 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
d39d938c VY |
1078 | return err; |
1079 | } | |
1080 | ||
1081 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1082 | { | |
1083 | struct sk_buff *skb; | |
1084 | struct udp_sock *up = udp_sk(sk); | |
1085 | struct flowi6 fl6; | |
1086 | int err = 0; | |
1087 | ||
1088 | if (up->pending == AF_INET) | |
1089 | return udp_push_pending_frames(sk); | |
1090 | ||
1091 | /* ip6_finish_skb will release the cork, so make a copy of | |
1092 | * fl6 here. | |
1093 | */ | |
1094 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1095 | ||
1096 | skb = ip6_finish_skb(sk); | |
1097 | if (!skb) | |
1098 | goto out; | |
1099 | ||
1100 | err = udp_v6_send_skb(skb, &fl6); | |
1101 | ||
1da177e4 LT |
1102 | out: |
1103 | up->len = 0; | |
1104 | up->pending = 0; | |
1105 | return err; | |
1106 | } | |
1107 | ||
1b784140 | 1108 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1109 | { |
1110 | struct ipv6_txoptions opt_space; | |
1111 | struct udp_sock *up = udp_sk(sk); | |
1112 | struct inet_sock *inet = inet_sk(sk); | |
1113 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1114 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1115 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1116 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1117 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1118 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1119 | struct flowi6 fl6; |
1da177e4 LT |
1120 | struct dst_entry *dst; |
1121 | int addr_len = msg->msg_namelen; | |
1122 | int ulen = len; | |
1123 | int hlimit = -1; | |
41a1f8ea | 1124 | int tclass = -1; |
13b52cd4 | 1125 | int dontfrag = -1; |
1da177e4 LT |
1126 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1127 | int err; | |
987905de | 1128 | int connected = 0; |
b2bf1e26 | 1129 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1130 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1131 | |
1132 | /* destination address check */ | |
1133 | if (sin6) { | |
1134 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1135 | return -EINVAL; | |
1136 | ||
1137 | switch (sin6->sin6_family) { | |
1138 | case AF_INET6: | |
1139 | if (addr_len < SIN6_LEN_RFC2133) | |
1140 | return -EINVAL; | |
1141 | daddr = &sin6->sin6_addr; | |
1142 | break; | |
1143 | case AF_INET: | |
1144 | goto do_udp_sendmsg; | |
1145 | case AF_UNSPEC: | |
1146 | msg->msg_name = sin6 = NULL; | |
1147 | msg->msg_namelen = addr_len = 0; | |
1148 | daddr = NULL; | |
1149 | break; | |
1150 | default: | |
1151 | return -EINVAL; | |
1152 | } | |
1153 | } else if (!up->pending) { | |
1154 | if (sk->sk_state != TCP_ESTABLISHED) | |
1155 | return -EDESTADDRREQ; | |
efe4208f | 1156 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1157 | } else |
1da177e4 LT |
1158 | daddr = NULL; |
1159 | ||
1160 | if (daddr) { | |
e773e4fa | 1161 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1162 | struct sockaddr_in sin; |
1163 | sin.sin_family = AF_INET; | |
c720c7e8 | 1164 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1165 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1166 | msg->msg_name = &sin; | |
1167 | msg->msg_namelen = sizeof(sin); | |
1168 | do_udp_sendmsg: | |
1169 | if (__ipv6_only_sock(sk)) | |
1170 | return -ENETUNREACH; | |
1b784140 | 1171 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1172 | } |
1173 | } | |
1174 | ||
1175 | if (up->pending == AF_INET) | |
1b784140 | 1176 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1177 | |
1178 | /* Rough check on arithmetic overflow, | |
b59e139b | 1179 | better check is made in ip6_append_data(). |
1da177e4 LT |
1180 | */ |
1181 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1182 | return -EMSGSIZE; | |
1ab1457c | 1183 | |
03485f2a | 1184 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1185 | if (up->pending) { |
1186 | /* | |
1187 | * There are pending frames. | |
1188 | * The socket lock must be held while it's corked. | |
1189 | */ | |
1190 | lock_sock(sk); | |
1191 | if (likely(up->pending)) { | |
1192 | if (unlikely(up->pending != AF_INET6)) { | |
1193 | release_sock(sk); | |
1194 | return -EAFNOSUPPORT; | |
1195 | } | |
1196 | dst = NULL; | |
1197 | goto do_append_data; | |
1198 | } | |
1199 | release_sock(sk); | |
1200 | } | |
1201 | ulen += sizeof(struct udphdr); | |
1202 | ||
4c9483b2 | 1203 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1204 | |
1205 | if (sin6) { | |
1206 | if (sin6->sin6_port == 0) | |
1207 | return -EINVAL; | |
1208 | ||
1958b856 | 1209 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1210 | daddr = &sin6->sin6_addr; |
1211 | ||
1212 | if (np->sndflow) { | |
4c9483b2 DM |
1213 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1214 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1215 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1216 | if (!flowlabel) |
1da177e4 | 1217 | return -EINVAL; |
1da177e4 LT |
1218 | } |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Otherwise it will be difficult to maintain | |
1223 | * sk->sk_dst_cache. | |
1224 | */ | |
1225 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1226 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1227 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1228 | |
1229 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1230 | sin6->sin6_scope_id && | |
842df073 | 1231 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1232 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1233 | } else { |
1234 | if (sk->sk_state != TCP_ESTABLISHED) | |
1235 | return -EDESTADDRREQ; | |
1236 | ||
1958b856 | 1237 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1238 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1239 | fl6.flowlabel = np->flow_label; |
987905de | 1240 | connected = 1; |
1da177e4 LT |
1241 | } |
1242 | ||
4c9483b2 DM |
1243 | if (!fl6.flowi6_oif) |
1244 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1245 | |
4c9483b2 DM |
1246 | if (!fl6.flowi6_oif) |
1247 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1248 | |
4c9483b2 | 1249 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1250 | |
1da177e4 LT |
1251 | if (msg->msg_controllen) { |
1252 | opt = &opt_space; | |
1253 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1254 | opt->tot_len = sizeof(*opt); | |
1255 | ||
73df66f8 TP |
1256 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1257 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1258 | if (err < 0) { |
1259 | fl6_sock_release(flowlabel); | |
1260 | return err; | |
1261 | } | |
4c9483b2 DM |
1262 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1263 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1264 | if (!flowlabel) |
1da177e4 LT |
1265 | return -EINVAL; |
1266 | } | |
1267 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1268 | opt = NULL; | |
987905de | 1269 | connected = 0; |
1da177e4 | 1270 | } |
45f6fad8 ED |
1271 | if (!opt) { |
1272 | opt = txopt_get(np); | |
1273 | opt_to_free = opt; | |
1274 | } | |
df9890c3 YH |
1275 | if (flowlabel) |
1276 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1277 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1278 | |
4c9483b2 | 1279 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1280 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1281 | fl6.daddr = *daddr; |
876c7f41 | 1282 | else |
4c9483b2 DM |
1283 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1284 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1285 | fl6.saddr = np->saddr; |
1958b856 | 1286 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1287 | |
4c9483b2 | 1288 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1289 | if (final_p) |
987905de | 1290 | connected = 0; |
1da177e4 | 1291 | |
4c9483b2 DM |
1292 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1293 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1294 | connected = 0; |
c4062dfc EH |
1295 | } else if (!fl6.flowi6_oif) |
1296 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1297 | |
4c9483b2 | 1298 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1299 | |
0e0d44ab | 1300 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1301 | if (IS_ERR(dst)) { |
1302 | err = PTR_ERR(dst); | |
1303 | dst = NULL; | |
1da177e4 | 1304 | goto out; |
14e50e57 | 1305 | } |
1da177e4 | 1306 | |
5c98631c LC |
1307 | if (hlimit < 0) |
1308 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1309 | |
e651f03a | 1310 | if (tclass < 0) |
41a1f8ea | 1311 | tclass = np->tclass; |
41a1f8ea | 1312 | |
1da177e4 LT |
1313 | if (msg->msg_flags&MSG_CONFIRM) |
1314 | goto do_confirm; | |
1315 | back_from_confirm: | |
1316 | ||
03485f2a VY |
1317 | /* Lockless fast path for the non-corking case */ |
1318 | if (!corkreq) { | |
1319 | struct sk_buff *skb; | |
1320 | ||
1321 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
1322 | sizeof(struct udphdr), hlimit, tclass, opt, | |
1323 | &fl6, (struct rt6_info *)dst, | |
1324 | msg->msg_flags, dontfrag); | |
1325 | err = PTR_ERR(skb); | |
1326 | if (!IS_ERR_OR_NULL(skb)) | |
1327 | err = udp_v6_send_skb(skb, &fl6); | |
1328 | goto release_dst; | |
1329 | } | |
1330 | ||
1da177e4 LT |
1331 | lock_sock(sk); |
1332 | if (unlikely(up->pending)) { | |
1333 | /* The socket is already corked while preparing it. */ | |
1334 | /* ... which is an evident application bug. --ANK */ | |
1335 | release_sock(sk); | |
1336 | ||
ba7a46f1 | 1337 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1338 | err = -EINVAL; |
1339 | goto out; | |
1340 | } | |
1341 | ||
1342 | up->pending = AF_INET6; | |
1343 | ||
1344 | do_append_data: | |
e36d3ff9 JP |
1345 | if (dontfrag < 0) |
1346 | dontfrag = np->dontfrag; | |
1da177e4 | 1347 | up->len += ulen; |
f69e6d13 | 1348 | err = ip6_append_data(sk, getfrag, msg, ulen, |
4c9483b2 | 1349 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
67ba4152 | 1350 | (struct rt6_info *)dst, |
13b52cd4 | 1351 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1352 | if (err) |
1353 | udp_v6_flush_pending_frames(sk); | |
1354 | else if (!corkreq) | |
4c0a6cb0 | 1355 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1356 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1357 | up->pending = 0; | |
1da177e4 | 1358 | |
03485f2a VY |
1359 | if (err > 0) |
1360 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1361 | release_sock(sk); | |
1362 | ||
1363 | release_dst: | |
a5e7c210 DM |
1364 | if (dst) { |
1365 | if (connected) { | |
1366 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1367 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1368 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1369 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1370 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1371 | &np->saddr : |
1372 | #endif | |
1373 | NULL); | |
a5e7c210 DM |
1374 | } else { |
1375 | dst_release(dst); | |
1376 | } | |
a3c96089 | 1377 | dst = NULL; |
a5e7c210 DM |
1378 | } |
1379 | ||
1da177e4 | 1380 | out: |
a3c96089 | 1381 | dst_release(dst); |
1da177e4 | 1382 | fl6_sock_release(flowlabel); |
45f6fad8 | 1383 | txopt_put(opt_to_free); |
cd562c98 | 1384 | if (!err) |
1da177e4 | 1385 | return len; |
a18135eb DM |
1386 | /* |
1387 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1388 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1389 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1390 | * things). We could add another new stat but at least for now that | |
1391 | * seems like overkill. | |
1392 | */ | |
1393 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1394 | UDP6_INC_STATS_USER(sock_net(sk), |
1395 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1396 | } |
1da177e4 LT |
1397 | return err; |
1398 | ||
1399 | do_confirm: | |
1400 | dst_confirm(dst); | |
1401 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1402 | goto back_from_confirm; | |
1403 | err = 0; | |
1404 | goto out; | |
1405 | } | |
1406 | ||
7d06b2e0 | 1407 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1408 | { |
44046a59 | 1409 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1410 | lock_sock(sk); |
1411 | udp_v6_flush_pending_frames(sk); | |
1412 | release_sock(sk); | |
1413 | ||
44046a59 TP |
1414 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1415 | void (*encap_destroy)(struct sock *sk); | |
1416 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1417 | if (encap_destroy) | |
1418 | encap_destroy(sk); | |
1419 | } | |
1420 | ||
1da177e4 | 1421 | inet6_destroy_sock(sk); |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | /* | |
1425 | * Socket option code for UDP | |
1426 | */ | |
ba4e58ec | 1427 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1428 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1429 | { |
db8dac20 | 1430 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1431 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1432 | udp_v6_push_pending_frames); | |
ba4e58ec | 1433 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1434 | } |
1435 | ||
1436 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1437 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1438 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1439 | { |
db8dac20 | 1440 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1441 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1442 | udp_v6_push_pending_frames); | |
ba4e58ec | 1443 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1444 | } |
1445 | #endif | |
1446 | ||
ba4e58ec GR |
1447 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1448 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1449 | { |
db8dac20 | 1450 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1451 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1452 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1453 | } |
1454 | ||
1455 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1456 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1457 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1458 | { |
db8dac20 | 1459 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1460 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1461 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1462 | } |
1463 | #endif | |
1464 | ||
41135cc8 | 1465 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1466 | .handler = udpv6_rcv, |
1467 | .err_handler = udpv6_err, | |
1468 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1469 | }; | |
1470 | ||
1471 | /* ------------------------------------------------------------------------ */ | |
1472 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1473 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1474 | { |
17ef66af LC |
1475 | if (v == SEQ_START_TOKEN) { |
1476 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1477 | } else { | |
1478 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1479 | struct inet_sock *inet = inet_sk(v); | |
1480 | __u16 srcp = ntohs(inet->inet_sport); | |
1481 | __u16 destp = ntohs(inet->inet_dport); | |
1482 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1483 | } | |
1da177e4 LT |
1484 | return 0; |
1485 | } | |
1486 | ||
73cb88ec AV |
1487 | static const struct file_operations udp6_afinfo_seq_fops = { |
1488 | .owner = THIS_MODULE, | |
1489 | .open = udp_seq_open, | |
1490 | .read = seq_read, | |
1491 | .llseek = seq_lseek, | |
1492 | .release = seq_release_net | |
1493 | }; | |
1494 | ||
1da177e4 | 1495 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1496 | .name = "udp6", |
1497 | .family = AF_INET6, | |
645ca708 | 1498 | .udp_table = &udp_table, |
73cb88ec | 1499 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1500 | .seq_ops = { |
1501 | .show = udp6_seq_show, | |
1502 | }, | |
1da177e4 LT |
1503 | }; |
1504 | ||
2c8c1e72 | 1505 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1506 | { |
0c96d8c5 | 1507 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1508 | } |
1509 | ||
ec120da6 IM |
1510 | void udp6_proc_exit(struct net *net) |
1511 | { | |
0c96d8c5 | 1512 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1513 | } |
1514 | #endif /* CONFIG_PROC_FS */ | |
1515 | ||
f77d6021 ED |
1516 | void udp_v6_clear_sk(struct sock *sk, int size) |
1517 | { | |
1518 | struct inet_sock *inet = inet_sk(sk); | |
1519 | ||
1520 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1521 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1522 | ||
1523 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1524 | memset(&inet->pinet6 + 1, 0, size); | |
1525 | } | |
1526 | ||
1da177e4 LT |
1527 | /* ------------------------------------------------------------------------ */ |
1528 | ||
1529 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1530 | .name = "UDPv6", |
1531 | .owner = THIS_MODULE, | |
ba4e58ec | 1532 | .close = udp_lib_close, |
543d9cfe ACM |
1533 | .connect = ip6_datagram_connect, |
1534 | .disconnect = udp_disconnect, | |
1535 | .ioctl = udp_ioctl, | |
1536 | .destroy = udpv6_destroy_sock, | |
1537 | .setsockopt = udpv6_setsockopt, | |
1538 | .getsockopt = udpv6_getsockopt, | |
1539 | .sendmsg = udpv6_sendmsg, | |
1540 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1541 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1542 | .hash = udp_lib_hash, |
1543 | .unhash = udp_lib_unhash, | |
719f8358 | 1544 | .rehash = udp_v6_rehash, |
543d9cfe | 1545 | .get_port = udp_v6_get_port, |
95766fff HA |
1546 | .memory_allocated = &udp_memory_allocated, |
1547 | .sysctl_mem = sysctl_udp_mem, | |
1548 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1549 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1550 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1551 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1552 | .h.udp_table = &udp_table, |
3fdadf7d | 1553 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1554 | .compat_setsockopt = compat_udpv6_setsockopt, |
1555 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1556 | #endif |
f77d6021 | 1557 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1558 | }; |
1559 | ||
1da177e4 LT |
1560 | static struct inet_protosw udpv6_protosw = { |
1561 | .type = SOCK_DGRAM, | |
1562 | .protocol = IPPROTO_UDP, | |
1563 | .prot = &udpv6_prot, | |
1564 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1565 | .flags = INET_PROTOSW_PERMANENT, |
1566 | }; | |
1567 | ||
7f4e4868 | 1568 | int __init udpv6_init(void) |
1da177e4 | 1569 | { |
7f4e4868 DL |
1570 | int ret; |
1571 | ||
3336288a VY |
1572 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1573 | if (ret) | |
c6b641a4 | 1574 | goto out; |
3336288a | 1575 | |
7f4e4868 DL |
1576 | ret = inet6_register_protosw(&udpv6_protosw); |
1577 | if (ret) | |
1578 | goto out_udpv6_protocol; | |
1579 | out: | |
1580 | return ret; | |
1581 | ||
1582 | out_udpv6_protocol: | |
1583 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1584 | goto out; | |
1585 | } | |
1586 | ||
09f7709f | 1587 | void udpv6_exit(void) |
7f4e4868 DL |
1588 | { |
1589 | inet6_unregister_protosw(&udpv6_protosw); | |
1590 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1591 | } |