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Commit | Line | Data |
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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> |
076bb0c8 | 49 | #include <net/busy_poll.h> |
e32ea7e7 | 50 | #include <net/sock_reuseport.h> |
1da177e4 LT |
51 | |
52 | #include <linux/proc_fs.h> | |
53 | #include <linux/seq_file.h> | |
22911fc5 | 54 | #include <trace/events/skb.h> |
ba4e58ec | 55 | #include "udp_impl.h" |
1da177e4 | 56 | |
6eada011 ED |
57 | static u32 udp6_ehashfn(const struct net *net, |
58 | const struct in6_addr *laddr, | |
59 | const u16 lport, | |
60 | const struct in6_addr *faddr, | |
61 | const __be16 fport) | |
b50026b5 | 62 | { |
1bbdceef HFS |
63 | static u32 udp6_ehash_secret __read_mostly; |
64 | static u32 udp_ipv6_hash_secret __read_mostly; | |
65 | ||
66 | u32 lhash, fhash; | |
67 | ||
68 | net_get_random_once(&udp6_ehash_secret, | |
69 | sizeof(udp6_ehash_secret)); | |
70 | net_get_random_once(&udp_ipv6_hash_secret, | |
71 | sizeof(udp_ipv6_hash_secret)); | |
72 | ||
73 | lhash = (__force u32)laddr->s6_addr32[3]; | |
74 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
75 | ||
b50026b5 | 76 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 77 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
78 | } |
79 | ||
e32ea7e7 CG |
80 | /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6 |
81 | * only, and any IPv4 addresses if not IPv6 only | |
82 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
83 | * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY, | |
84 | * and 0.0.0.0 equals to 0.0.0.0 only | |
85 | */ | |
86 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, | |
87 | bool match_wildcard) | |
b2f5e7cd | 88 | { |
b2f5e7cd | 89 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); |
b2f5e7cd | 90 | int sk2_ipv6only = inet_v6_ipv6only(sk2); |
efe4208f | 91 | int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); |
b2f5e7cd VY |
92 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
93 | ||
94 | /* if both are mapped, treat as IPv4 */ | |
e32ea7e7 CG |
95 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) { |
96 | if (!sk2_ipv6only) { | |
97 | if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr) | |
98 | return 1; | |
99 | if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr) | |
100 | return match_wildcard; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY) | |
106 | return 1; | |
b2f5e7cd | 107 | |
e32ea7e7 | 108 | if (addr_type2 == IPV6_ADDR_ANY && match_wildcard && |
b2f5e7cd VY |
109 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) |
110 | return 1; | |
111 | ||
e32ea7e7 | 112 | if (addr_type == IPV6_ADDR_ANY && match_wildcard && |
9fe516ba | 113 | !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED)) |
b2f5e7cd VY |
114 | return 1; |
115 | ||
116 | if (sk2_rcv_saddr6 && | |
efe4208f | 117 | ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) |
b2f5e7cd VY |
118 | return 1; |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
6eada011 ED |
123 | static u32 udp6_portaddr_hash(const struct net *net, |
124 | const struct in6_addr *addr6, | |
125 | unsigned int port) | |
d4cada4a ED |
126 | { |
127 | unsigned int hash, mix = net_hash_mix(net); | |
128 | ||
129 | if (ipv6_addr_any(addr6)) | |
130 | hash = jhash_1word(0, mix); | |
856540ee | 131 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 132 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 133 | else |
0eae88f3 | 134 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
135 | |
136 | return hash ^ port; | |
137 | } | |
138 | ||
6ba5a3c5 | 139 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 140 | { |
30fff923 ED |
141 | unsigned int hash2_nulladdr = |
142 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 143 | unsigned int hash2_partial = |
efe4208f | 144 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 145 | |
d4cada4a | 146 | /* precompute partial secondary hash */ |
30fff923 ED |
147 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
148 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
149 | } |
150 | ||
719f8358 ED |
151 | static void udp_v6_rehash(struct sock *sk) |
152 | { | |
153 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 154 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
155 | inet_sk(sk)->inet_num); |
156 | ||
157 | udp_lib_rehash(sk, new_hash); | |
158 | } | |
159 | ||
645ca708 ED |
160 | static inline int compute_score(struct sock *sk, struct net *net, |
161 | unsigned short hnum, | |
88440ae7 BS |
162 | const struct in6_addr *saddr, __be16 sport, |
163 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
164 | int dif) |
165 | { | |
60c04aec JP |
166 | int score; |
167 | struct inet_sock *inet; | |
168 | ||
169 | if (!net_eq(sock_net(sk), net) || | |
170 | udp_sk(sk)->udp_port_hash != hnum || | |
171 | sk->sk_family != PF_INET6) | |
172 | return -1; | |
173 | ||
174 | score = 0; | |
175 | inet = inet_sk(sk); | |
176 | ||
177 | if (inet->inet_dport) { | |
178 | if (inet->inet_dport != sport) | |
179 | return -1; | |
180 | score++; | |
181 | } | |
182 | ||
183 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
184 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
185 | return -1; | |
186 | score++; | |
187 | } | |
188 | ||
189 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
190 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
191 | return -1; | |
192 | score++; | |
193 | } | |
194 | ||
195 | if (sk->sk_bound_dev_if) { | |
196 | if (sk->sk_bound_dev_if != dif) | |
197 | return -1; | |
198 | score++; | |
645ca708 | 199 | } |
60c04aec | 200 | |
70da268b ED |
201 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
202 | score++; | |
203 | ||
645ca708 ED |
204 | return score; |
205 | } | |
206 | ||
fddc17de | 207 | static inline int compute_score2(struct sock *sk, struct net *net, |
60c04aec JP |
208 | const struct in6_addr *saddr, __be16 sport, |
209 | const struct in6_addr *daddr, | |
210 | unsigned short hnum, int dif) | |
fddc17de | 211 | { |
60c04aec JP |
212 | int score; |
213 | struct inet_sock *inet; | |
fddc17de | 214 | |
60c04aec JP |
215 | if (!net_eq(sock_net(sk), net) || |
216 | udp_sk(sk)->udp_port_hash != hnum || | |
217 | sk->sk_family != PF_INET6) | |
218 | return -1; | |
fddc17de | 219 | |
60c04aec JP |
220 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
221 | return -1; | |
222 | ||
223 | score = 0; | |
224 | inet = inet_sk(sk); | |
225 | ||
226 | if (inet->inet_dport) { | |
227 | if (inet->inet_dport != sport) | |
228 | return -1; | |
229 | score++; | |
230 | } | |
231 | ||
232 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
233 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de | 234 | return -1; |
60c04aec | 235 | score++; |
fddc17de | 236 | } |
60c04aec JP |
237 | |
238 | if (sk->sk_bound_dev_if) { | |
239 | if (sk->sk_bound_dev_if != dif) | |
240 | return -1; | |
241 | score++; | |
242 | } | |
243 | ||
70da268b ED |
244 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
245 | score++; | |
246 | ||
fddc17de ED |
247 | return score; |
248 | } | |
249 | ||
fddc17de ED |
250 | /* called with read_rcu_lock() */ |
251 | static struct sock *udp6_lib_lookup2(struct net *net, | |
252 | const struct in6_addr *saddr, __be16 sport, | |
253 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
1134158b CG |
254 | struct udp_hslot *hslot2, unsigned int slot2, |
255 | struct sk_buff *skb) | |
fddc17de ED |
256 | { |
257 | struct sock *sk, *result; | |
258 | struct hlist_nulls_node *node; | |
72289b96 TH |
259 | int score, badness, matches = 0, reuseport = 0; |
260 | u32 hash = 0; | |
fddc17de ED |
261 | |
262 | begin: | |
263 | result = NULL; | |
264 | badness = -1; | |
265 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
266 | score = compute_score2(sk, net, saddr, sport, | |
267 | daddr, hnum, dif); | |
268 | if (score > badness) { | |
269 | result = sk; | |
270 | badness = score; | |
72289b96 TH |
271 | reuseport = sk->sk_reuseport; |
272 | if (reuseport) { | |
e32ea7e7 | 273 | struct sock *sk2; |
b50026b5 HFS |
274 | hash = udp6_ehashfn(net, daddr, hnum, |
275 | saddr, sport); | |
1134158b CG |
276 | sk2 = reuseport_select_sock(sk, hash, skb, |
277 | sizeof(struct udphdr)); | |
e32ea7e7 CG |
278 | if (sk2) { |
279 | result = sk2; | |
280 | goto found; | |
281 | } | |
72289b96 | 282 | matches = 1; |
70da268b | 283 | } |
72289b96 TH |
284 | } else if (score == badness && reuseport) { |
285 | matches++; | |
8fc54f68 | 286 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
287 | result = sk; |
288 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
289 | } |
290 | } | |
291 | /* | |
292 | * if the nulls value we got at the end of this lookup is | |
293 | * not the expected one, we must restart lookup. | |
294 | * We probably met an item that was moved to another chain. | |
295 | */ | |
296 | if (get_nulls_value(node) != slot2) | |
297 | goto begin; | |
298 | ||
299 | if (result) { | |
e32ea7e7 | 300 | found: |
c31504dc | 301 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
302 | result = NULL; |
303 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
304 | daddr, hnum, dif) < badness)) { | |
305 | sock_put(result); | |
306 | goto begin; | |
307 | } | |
308 | } | |
309 | return result; | |
310 | } | |
311 | ||
fce82338 | 312 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
313 | const struct in6_addr *saddr, __be16 sport, |
314 | const struct in6_addr *daddr, __be16 dport, | |
538950a1 CG |
315 | int dif, struct udp_table *udptable, |
316 | struct sk_buff *skb) | |
1da177e4 | 317 | { |
271b72c7 | 318 | struct sock *sk, *result; |
88ab1932 | 319 | struct hlist_nulls_node *node; |
1da177e4 | 320 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
321 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
322 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 TH |
323 | int score, badness, matches = 0, reuseport = 0; |
324 | u32 hash = 0; | |
645ca708 | 325 | |
271b72c7 | 326 | rcu_read_lock(); |
fddc17de ED |
327 | if (hslot->count > 10) { |
328 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
329 | slot2 = hash2 & udptable->mask; | |
330 | hslot2 = &udptable->hash2[slot2]; | |
331 | if (hslot->count < hslot2->count) | |
332 | goto begin; | |
333 | ||
334 | result = udp6_lib_lookup2(net, saddr, sport, | |
335 | daddr, hnum, dif, | |
1134158b | 336 | hslot2, slot2, skb); |
fddc17de ED |
337 | if (!result) { |
338 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
339 | slot2 = hash2 & udptable->mask; | |
340 | hslot2 = &udptable->hash2[slot2]; | |
341 | if (hslot->count < hslot2->count) | |
342 | goto begin; | |
343 | ||
1223c67c JBD |
344 | result = udp6_lib_lookup2(net, saddr, sport, |
345 | &in6addr_any, hnum, dif, | |
1134158b | 346 | hslot2, slot2, skb); |
fddc17de ED |
347 | } |
348 | rcu_read_unlock(); | |
349 | return result; | |
350 | } | |
271b72c7 ED |
351 | begin: |
352 | result = NULL; | |
353 | badness = -1; | |
88ab1932 | 354 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
355 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
356 | if (score > badness) { | |
357 | result = sk; | |
358 | badness = score; | |
72289b96 TH |
359 | reuseport = sk->sk_reuseport; |
360 | if (reuseport) { | |
e32ea7e7 | 361 | struct sock *sk2; |
b50026b5 HFS |
362 | hash = udp6_ehashfn(net, daddr, hnum, |
363 | saddr, sport); | |
538950a1 CG |
364 | sk2 = reuseport_select_sock(sk, hash, skb, |
365 | sizeof(struct udphdr)); | |
e32ea7e7 CG |
366 | if (sk2) { |
367 | result = sk2; | |
368 | goto found; | |
369 | } | |
72289b96 TH |
370 | matches = 1; |
371 | } | |
372 | } else if (score == badness && reuseport) { | |
373 | matches++; | |
8fc54f68 | 374 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
375 | result = sk; |
376 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
377 | } |
378 | } | |
88ab1932 ED |
379 | /* |
380 | * if the nulls value we got at the end of this lookup is | |
381 | * not the expected one, we must restart lookup. | |
382 | * We probably met an item that was moved to another chain. | |
383 | */ | |
fddc17de | 384 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
385 | goto begin; |
386 | ||
271b72c7 | 387 | if (result) { |
e32ea7e7 | 388 | found: |
c31504dc | 389 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
390 | result = NULL; |
391 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
392 | daddr, dport, dif) < badness)) { | |
393 | sock_put(result); | |
394 | goto begin; | |
395 | } | |
396 | } | |
397 | rcu_read_unlock(); | |
1da177e4 LT |
398 | return result; |
399 | } | |
fce82338 | 400 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 401 | |
607c4aaf KK |
402 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
403 | __be16 sport, __be16 dport, | |
645ca708 | 404 | struct udp_table *udptable) |
607c4aaf | 405 | { |
23542618 | 406 | struct sock *sk; |
b71d1d42 | 407 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 408 | |
e5d08d71 IM |
409 | sk = skb_steal_sock(skb); |
410 | if (unlikely(sk)) | |
23542618 | 411 | return sk; |
adf30907 ED |
412 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
413 | &iph->daddr, dport, inet6_iif(skb), | |
538950a1 | 414 | udptable, skb); |
607c4aaf KK |
415 | } |
416 | ||
aa976fc0 BS |
417 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
418 | const struct in6_addr *daddr, __be16 dport, int dif) | |
419 | { | |
538950a1 | 420 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL); |
aa976fc0 BS |
421 | } |
422 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
423 | ||
1da177e4 | 424 | /* |
67ba4152 IM |
425 | * This should be easy, if there is something there we |
426 | * return it, otherwise we block. | |
1da177e4 LT |
427 | */ |
428 | ||
1b784140 | 429 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
430 | int noblock, int flags, int *addr_len) |
431 | { | |
432 | struct ipv6_pinfo *np = inet6_sk(sk); | |
433 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 434 | struct sk_buff *skb; |
59c2cdae | 435 | unsigned int ulen, copied; |
3f518bf7 | 436 | int peeked, off = 0; |
759e5d00 HX |
437 | int err; |
438 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 439 | bool checksum_valid = false; |
f26ba175 | 440 | int is_udp4; |
8a74ad60 | 441 | bool slow; |
1da177e4 | 442 | |
1da177e4 | 443 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 444 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 445 | |
4b340ae2 | 446 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 447 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 448 | |
1da177e4 | 449 | try_again: |
a59322be | 450 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 451 | &peeked, &off, &err); |
1da177e4 LT |
452 | if (!skb) |
453 | goto out; | |
454 | ||
759e5d00 | 455 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
456 | copied = len; |
457 | if (copied > ulen) | |
458 | copied = ulen; | |
459 | else if (copied < ulen) | |
1ab1457c | 460 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 461 | |
f26ba175 WY |
462 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
463 | ||
ba4e58ec | 464 | /* |
759e5d00 HX |
465 | * If checksum is needed at all, try to do it while copying the |
466 | * data. If the data is truncated, or if we only want a partial | |
467 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 468 | */ |
ba4e58ec | 469 | |
59c2cdae | 470 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
197c949e ED |
471 | checksum_valid = !udp_lib_checksum_complete(skb); |
472 | if (!checksum_valid) | |
1da177e4 | 473 | goto csum_copy_err; |
ba4e58ec GR |
474 | } |
475 | ||
197c949e | 476 | if (checksum_valid || skb_csum_unnecessary(skb)) |
51f3d02b DM |
477 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
478 | msg, copied); | |
ba4e58ec | 479 | else { |
227158db | 480 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); |
1da177e4 LT |
481 | if (err == -EINVAL) |
482 | goto csum_copy_err; | |
483 | } | |
22911fc5 ED |
484 | if (unlikely(err)) { |
485 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
486 | if (!peeked) { |
487 | atomic_inc(&sk->sk_drops); | |
488 | if (is_udp4) | |
489 | UDP_INC_STATS_USER(sock_net(sk), | |
490 | UDP_MIB_INERRORS, | |
491 | is_udplite); | |
492 | else | |
493 | UDP6_INC_STATS_USER(sock_net(sk), | |
494 | UDP_MIB_INERRORS, | |
495 | is_udplite); | |
496 | } | |
1da177e4 | 497 | goto out_free; |
22911fc5 | 498 | } |
f26ba175 WY |
499 | if (!peeked) { |
500 | if (is_udp4) | |
501 | UDP_INC_STATS_USER(sock_net(sk), | |
502 | UDP_MIB_INDATAGRAMS, is_udplite); | |
503 | else | |
504 | UDP6_INC_STATS_USER(sock_net(sk), | |
505 | UDP_MIB_INDATAGRAMS, is_udplite); | |
506 | } | |
cb75994e | 507 | |
3b885787 | 508 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
509 | |
510 | /* Copy the address. */ | |
511 | if (msg->msg_name) { | |
342dfc30 | 512 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 513 | sin6->sin6_family = AF_INET6; |
4bedb452 | 514 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 515 | sin6->sin6_flowinfo = 0; |
1da177e4 | 516 | |
842df073 | 517 | if (is_udp4) { |
b301e82c BH |
518 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
519 | &sin6->sin6_addr); | |
842df073 HFS |
520 | sin6->sin6_scope_id = 0; |
521 | } else { | |
4e3fd7a0 | 522 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
523 | sin6->sin6_scope_id = |
524 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 525 | inet6_iif(skb)); |
1da177e4 | 526 | } |
bceaa902 | 527 | *addr_len = sizeof(*sin6); |
1da177e4 | 528 | } |
4b261c75 HFS |
529 | |
530 | if (np->rxopt.all) | |
531 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
532 | ||
f26ba175 | 533 | if (is_udp4) { |
1da177e4 LT |
534 | if (inet->cmsg_flags) |
535 | ip_cmsg_recv(msg, skb); | |
536 | } else { | |
537 | if (np->rxopt.all) | |
4b261c75 | 538 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 539 | } |
1da177e4 | 540 | |
59c2cdae | 541 | err = copied; |
1da177e4 | 542 | if (flags & MSG_TRUNC) |
759e5d00 | 543 | err = ulen; |
1da177e4 LT |
544 | |
545 | out_free: | |
9d410c79 | 546 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
547 | out: |
548 | return err; | |
549 | ||
550 | csum_copy_err: | |
8a74ad60 | 551 | slow = lock_sock_fast(sk); |
0856f939 | 552 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
553 | if (is_udp4) { |
554 | UDP_INC_STATS_USER(sock_net(sk), | |
555 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
556 | UDP_INC_STATS_USER(sock_net(sk), |
557 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
558 | } else { |
559 | UDP6_INC_STATS_USER(sock_net(sk), | |
560 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
561 | UDP6_INC_STATS_USER(sock_net(sk), |
562 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 563 | } |
0856f939 | 564 | } |
8a74ad60 | 565 | unlock_sock_fast(sk, slow); |
1da177e4 | 566 | |
beb39db5 ED |
567 | /* starting over for a new packet, but check if we need to yield */ |
568 | cond_resched(); | |
9cfaa8de | 569 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
570 | goto try_again; |
571 | } | |
572 | ||
ba4e58ec | 573 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 574 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 575 | struct udp_table *udptable) |
1da177e4 LT |
576 | { |
577 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
578 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
579 | const struct in6_addr *saddr = &hdr->saddr; | |
580 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 581 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 LT |
582 | struct sock *sk; |
583 | int err; | |
7304fe46 | 584 | struct net *net = dev_net(skb->dev); |
1da177e4 | 585 | |
e32ea7e7 | 586 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 587 | inet6_iif(skb), udptable, skb); |
63159f29 | 588 | if (!sk) { |
7304fe46 DJ |
589 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
590 | ICMP6_MIB_INERRORS); | |
1da177e4 | 591 | return; |
7304fe46 | 592 | } |
1da177e4 | 593 | |
93b36cf3 HFS |
594 | if (type == ICMPV6_PKT_TOOBIG) { |
595 | if (!ip6_sk_accept_pmtu(sk)) | |
596 | goto out; | |
81aded24 | 597 | ip6_sk_update_pmtu(skb, sk, info); |
93b36cf3 | 598 | } |
1a462d18 | 599 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 600 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
601 | goto out; |
602 | } | |
81aded24 | 603 | |
1da177e4 LT |
604 | np = inet6_sk(sk); |
605 | ||
606 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
607 | goto out; | |
608 | ||
609 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
610 | goto out; | |
611 | ||
b1faf566 | 612 | if (np->recverr) |
1da177e4 | 613 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 614 | |
1da177e4 LT |
615 | sk->sk_err = err; |
616 | sk->sk_error_report(sk); | |
617 | out: | |
618 | sock_put(sk); | |
619 | } | |
620 | ||
f7ad74fe BL |
621 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
622 | { | |
623 | int rc; | |
624 | ||
efe4208f | 625 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 626 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 627 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 628 | sk_incoming_cpu_update(sk); |
005ec974 | 629 | } |
f7ad74fe BL |
630 | |
631 | rc = sock_queue_rcv_skb(sk, skb); | |
632 | if (rc < 0) { | |
633 | int is_udplite = IS_UDPLITE(sk); | |
634 | ||
635 | /* Note that an ENOMEM error is charged twice */ | |
636 | if (rc == -ENOMEM) | |
637 | UDP6_INC_STATS_BH(sock_net(sk), | |
638 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
639 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
640 | kfree_skb(skb); | |
641 | return -1; | |
642 | } | |
643 | return 0; | |
644 | } | |
645 | ||
ba4e58ec | 646 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 647 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 648 | u8 code, int offset, __be32 info) |
ba4e58ec | 649 | { |
645ca708 | 650 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
651 | } |
652 | ||
d7f3f621 BL |
653 | static struct static_key udpv6_encap_needed __read_mostly; |
654 | void udpv6_encap_enable(void) | |
655 | { | |
656 | if (!static_key_enabled(&udpv6_encap_needed)) | |
657 | static_key_slow_inc(&udpv6_encap_needed); | |
658 | } | |
659 | EXPORT_SYMBOL(udpv6_encap_enable); | |
660 | ||
f7ad74fe | 661 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 662 | { |
ba4e58ec | 663 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 664 | int rc; |
b2bf1e26 | 665 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 666 | |
ba4e58ec GR |
667 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
668 | goto drop; | |
1da177e4 | 669 | |
d7f3f621 BL |
670 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
671 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
672 | ||
673 | /* | |
674 | * This is an encapsulation socket so pass the skb to | |
675 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
676 | * fall through and pass this up the UDP socket. | |
677 | * up->encap_rcv() returns the following value: | |
678 | * =0 if skb was successfully passed to the encap | |
679 | * handler or was discarded by it. | |
680 | * >0 if skb should be passed on to UDP. | |
681 | * <0 if skb should be resubmitted as proto -N | |
682 | */ | |
683 | ||
684 | /* if we're overly short, let UDP handle it */ | |
685 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 686 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
687 | int ret; |
688 | ||
0a80966b TH |
689 | /* Verify checksum before giving to encap */ |
690 | if (udp_lib_checksum_complete(skb)) | |
691 | goto csum_error; | |
692 | ||
d7f3f621 BL |
693 | ret = encap_rcv(sk, skb); |
694 | if (ret <= 0) { | |
695 | UDP_INC_STATS_BH(sock_net(sk), | |
696 | UDP_MIB_INDATAGRAMS, | |
697 | is_udplite); | |
698 | return -ret; | |
699 | } | |
700 | } | |
701 | ||
702 | /* FALLTHROUGH -- it's a UDP Packet */ | |
703 | } | |
704 | ||
ba4e58ec GR |
705 | /* |
706 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
707 | */ | |
b2bf1e26 | 708 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
709 | |
710 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
711 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
712 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
713 | goto drop; |
714 | } | |
715 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
716 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
717 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
718 | goto drop; |
719 | } | |
1da177e4 LT |
720 | } |
721 | ||
33d480ce | 722 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 723 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 724 | goto csum_error; |
1ab6eb62 | 725 | } |
ba4e58ec | 726 | |
274f482d | 727 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
3e215c8d JL |
728 | UDP6_INC_STATS_BH(sock_net(sk), |
729 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 730 | goto drop; |
3e215c8d | 731 | } |
cb80ef46 | 732 | |
d826eb14 | 733 | skb_dst_drop(skb); |
cb75994e | 734 | |
cb80ef46 BL |
735 | bh_lock_sock(sk); |
736 | rc = 0; | |
737 | if (!sock_owned_by_user(sk)) | |
738 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
739 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
740 | bh_unlock_sock(sk); | |
741 | goto drop; | |
742 | } | |
743 | bh_unlock_sock(sk); | |
f7ad74fe BL |
744 | |
745 | return rc; | |
3e215c8d | 746 | |
6a5dc9e5 ED |
747 | csum_error: |
748 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 749 | drop: |
ef28d1a2 | 750 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 751 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
752 | kfree_skb(skb); |
753 | return -1; | |
1da177e4 LT |
754 | } |
755 | ||
5cf3d461 DH |
756 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
757 | __be16 loc_port, const struct in6_addr *loc_addr, | |
758 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
759 | int dif, unsigned short hnum) | |
1da177e4 | 760 | { |
5cf3d461 | 761 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 762 | |
5cf3d461 DH |
763 | if (!net_eq(sock_net(sk), net)) |
764 | return false; | |
765 | ||
766 | if (udp_sk(sk)->udp_port_hash != hnum || | |
767 | sk->sk_family != PF_INET6 || | |
768 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
769 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
770 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
771 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
772 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
773 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
774 | return false; |
775 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
776 | return false; | |
777 | return true; | |
1da177e4 LT |
778 | } |
779 | ||
a1ab77f9 ED |
780 | static void flush_stack(struct sock **stack, unsigned int count, |
781 | struct sk_buff *skb, unsigned int final) | |
782 | { | |
cb80ef46 | 783 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 784 | struct sock *sk; |
cb80ef46 | 785 | unsigned int i; |
a1ab77f9 ED |
786 | |
787 | for (i = 0; i < count; i++) { | |
f6b8f32c | 788 | sk = stack[i]; |
63159f29 | 789 | if (likely(!skb1)) |
cb80ef46 BL |
790 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
791 | if (!skb1) { | |
792 | atomic_inc(&sk->sk_drops); | |
793 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
794 | IS_UDPLITE(sk)); | |
795 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
796 | IS_UDPLITE(sk)); | |
a1ab77f9 | 797 | } |
cb80ef46 BL |
798 | |
799 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
800 | skb1 = NULL; | |
2dc41cff | 801 | sock_put(sk); |
a1ab77f9 | 802 | } |
cb80ef46 BL |
803 | if (unlikely(skb1)) |
804 | kfree_skb(skb1); | |
a1ab77f9 | 805 | } |
4068579e TH |
806 | |
807 | static void udp6_csum_zero_error(struct sk_buff *skb) | |
808 | { | |
809 | /* RFC 2460 section 8.1 says that we SHOULD log | |
810 | * this error. Well, it is reasonable. | |
811 | */ | |
ba7a46f1 JP |
812 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
813 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
814 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
815 | } |
816 | ||
1da177e4 LT |
817 | /* |
818 | * Note: called only from the BH handler context, | |
819 | * so we don't need to lock the hashes. | |
820 | */ | |
e3163493 | 821 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 822 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 823 | struct udp_table *udptable, int proto) |
1da177e4 | 824 | { |
a1ab77f9 | 825 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 826 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
827 | struct hlist_nulls_node *node; |
828 | unsigned short hnum = ntohs(uh->dest); | |
829 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
830 | int dif = inet6_iif(skb); | |
2dc41cff DH |
831 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
832 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); | |
36cbb245 | 833 | bool inner_flushed = false; |
2dc41cff DH |
834 | |
835 | if (use_hash2) { | |
836 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
837 | udp_table.mask; | |
838 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
839 | start_lookup: | |
840 | hslot = &udp_table.hash2[hash2]; | |
841 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
842 | } | |
1da177e4 | 843 | |
645ca708 | 844 | spin_lock(&hslot->lock); |
2dc41cff | 845 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
5cf3d461 DH |
846 | if (__udp_v6_is_mcast_sock(net, sk, |
847 | uh->dest, daddr, | |
848 | uh->source, saddr, | |
849 | dif, hnum) && | |
850 | /* If zero checksum and no_check is not on for | |
851 | * the socket then skip it. | |
852 | */ | |
853 | (uh->check || udp_sk(sk)->no_check6_rx)) { | |
854 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
855 | flush_stack(stack, count, skb, ~0); | |
36cbb245 | 856 | inner_flushed = true; |
5cf3d461 DH |
857 | count = 0; |
858 | } | |
4068579e | 859 | stack[count++] = sk; |
2dc41cff | 860 | sock_hold(sk); |
95766fff | 861 | } |
1da177e4 | 862 | } |
a1ab77f9 | 863 | |
645ca708 | 864 | spin_unlock(&hslot->lock); |
a1ab77f9 | 865 | |
2dc41cff DH |
866 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
867 | if (use_hash2 && hash2 != hash2_any) { | |
868 | hash2 = hash2_any; | |
869 | goto start_lookup; | |
870 | } | |
871 | ||
a1ab77f9 ED |
872 | if (count) { |
873 | flush_stack(stack, count, skb, count - 1); | |
a1ab77f9 | 874 | } else { |
36cbb245 RJ |
875 | if (!inner_flushed) |
876 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, | |
877 | proto == IPPROTO_UDPLITE); | |
878 | consume_skb(skb); | |
a1ab77f9 | 879 | } |
ba4e58ec | 880 | return 0; |
1da177e4 LT |
881 | } |
882 | ||
645ca708 | 883 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 884 | int proto) |
1da177e4 | 885 | { |
3ffe533c | 886 | struct net *net = dev_net(skb->dev); |
1da177e4 | 887 | struct sock *sk; |
1ab1457c | 888 | struct udphdr *uh; |
b71d1d42 | 889 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
890 | u32 ulen = 0; |
891 | ||
892 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 893 | goto discard; |
1da177e4 | 894 | |
0660e03f ACM |
895 | saddr = &ipv6_hdr(skb)->saddr; |
896 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 897 | uh = udp_hdr(skb); |
1da177e4 LT |
898 | |
899 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
900 | if (ulen > skb->len) |
901 | goto short_packet; | |
1da177e4 | 902 | |
759e5d00 HX |
903 | if (proto == IPPROTO_UDP) { |
904 | /* UDP validates ulen. */ | |
1da177e4 | 905 | |
ba4e58ec GR |
906 | /* Check for jumbo payload */ |
907 | if (ulen == 0) | |
908 | ulen = skb->len; | |
1da177e4 | 909 | |
ba4e58ec GR |
910 | if (ulen < sizeof(*uh)) |
911 | goto short_packet; | |
1da177e4 | 912 | |
ba4e58ec GR |
913 | if (ulen < skb->len) { |
914 | if (pskb_trim_rcsum(skb, ulen)) | |
915 | goto short_packet; | |
0660e03f ACM |
916 | saddr = &ipv6_hdr(skb)->saddr; |
917 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 918 | uh = udp_hdr(skb); |
ba4e58ec | 919 | } |
ba4e58ec | 920 | } |
1da177e4 | 921 | |
759e5d00 | 922 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 923 | goto csum_error; |
759e5d00 | 924 | |
1ab1457c YH |
925 | /* |
926 | * Multicast receive code | |
1da177e4 | 927 | */ |
ba4e58ec | 928 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 929 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 930 | saddr, daddr, udptable, proto); |
1da177e4 LT |
931 | |
932 | /* Unicast */ | |
933 | ||
1ab1457c | 934 | /* |
1da177e4 LT |
935 | * check socket cache ... must talk to Alan about his plans |
936 | * for sock caches... i'll skip this for now. | |
937 | */ | |
607c4aaf | 938 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 939 | if (sk) { |
a5b50476 ET |
940 | int ret; |
941 | ||
1c19448c | 942 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
79e0f1c9 | 943 | sock_put(sk); |
4068579e TH |
944 | udp6_csum_zero_error(skb); |
945 | goto csum_error; | |
946 | } | |
947 | ||
224d019c | 948 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
949 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
950 | ip6_compute_pseudo); | |
951 | ||
a5b50476 | 952 | ret = udpv6_queue_rcv_skb(sk, skb); |
cb80ef46 | 953 | sock_put(sk); |
1da177e4 | 954 | |
cb80ef46 BL |
955 | /* a return value > 0 means to resubmit the input, but |
956 | * it wants the return to be -protocol, or 0 | |
957 | */ | |
958 | if (ret > 0) | |
959 | return -ret; | |
1da177e4 | 960 | |
add459aa | 961 | return 0; |
1da177e4 | 962 | } |
1ab1457c | 963 | |
4068579e TH |
964 | if (!uh->check) { |
965 | udp6_csum_zero_error(skb); | |
966 | goto csum_error; | |
967 | } | |
968 | ||
cb80ef46 | 969 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 970 | goto discard; |
cb80ef46 BL |
971 | |
972 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 973 | goto csum_error; |
cb80ef46 BL |
974 | |
975 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
976 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
977 | ||
978 | kfree_skb(skb); | |
add459aa | 979 | return 0; |
1da177e4 | 980 | |
1ab1457c | 981 | short_packet: |
ba7a46f1 JP |
982 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
983 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
984 | saddr, ntohs(uh->source), | |
985 | ulen, skb->len, | |
986 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
987 | goto discard; |
988 | csum_error: | |
989 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 990 | discard: |
ef28d1a2 | 991 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 992 | kfree_skb(skb); |
add459aa | 993 | return 0; |
1da177e4 | 994 | } |
ba4e58ec | 995 | |
e5bbef20 | 996 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 997 | { |
645ca708 | 998 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
999 | } |
1000 | ||
1da177e4 LT |
1001 | /* |
1002 | * Throw away all pending data and cancel the corking. Socket is locked. | |
1003 | */ | |
1004 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
1005 | { | |
1006 | struct udp_sock *up = udp_sk(sk); | |
1007 | ||
36d926b9 DL |
1008 | if (up->pending == AF_INET) |
1009 | udp_flush_pending_frames(sk); | |
1010 | else if (up->pending) { | |
1da177e4 LT |
1011 | up->len = 0; |
1012 | up->pending = 0; | |
1013 | ip6_flush_pending_frames(sk); | |
1ab1457c | 1014 | } |
1da177e4 LT |
1015 | } |
1016 | ||
493c6be3 | 1017 | /** |
67ba4152 IM |
1018 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
1019 | * @sk: socket we are sending on | |
1020 | * @skb: sk_buff containing the filled-in UDP header | |
1021 | * (checksum field must be zeroed out) | |
493c6be3 SS |
1022 | */ |
1023 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
1024 | const struct in6_addr *saddr, | |
1025 | const struct in6_addr *daddr, int len) | |
1026 | { | |
1027 | unsigned int offset; | |
1028 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1029 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1030 | __wsum csum = 0; |
1031 | ||
d39d938c | 1032 | if (!frags) { |
493c6be3 SS |
1033 | /* Only one fragment on the socket. */ |
1034 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1035 | skb->csum_offset = offsetof(struct udphdr, check); | |
1036 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1037 | } else { | |
1038 | /* | |
1039 | * HW-checksum won't work as there are two or more | |
1040 | * fragments on the socket so that all csums of sk_buffs | |
1041 | * should be together | |
1042 | */ | |
1043 | offset = skb_transport_offset(skb); | |
1044 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1045 | ||
1046 | skb->ip_summed = CHECKSUM_NONE; | |
1047 | ||
d39d938c VY |
1048 | do { |
1049 | csum = csum_add(csum, frags->csum); | |
1050 | } while ((frags = frags->next)); | |
493c6be3 SS |
1051 | |
1052 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1053 | csum); | |
1054 | if (uh->check == 0) | |
1055 | uh->check = CSUM_MANGLED_0; | |
1056 | } | |
1057 | } | |
1058 | ||
1da177e4 LT |
1059 | /* |
1060 | * Sending | |
1061 | */ | |
1062 | ||
d39d938c | 1063 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 1064 | { |
d39d938c | 1065 | struct sock *sk = skb->sk; |
1da177e4 | 1066 | struct udphdr *uh; |
1da177e4 | 1067 | int err = 0; |
b2bf1e26 | 1068 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1069 | __wsum csum = 0; |
d39d938c VY |
1070 | int offset = skb_transport_offset(skb); |
1071 | int len = skb->len - offset; | |
1da177e4 LT |
1072 | |
1073 | /* | |
1074 | * Create a UDP header | |
1075 | */ | |
4bedb452 | 1076 | uh = udp_hdr(skb); |
1958b856 DM |
1077 | uh->source = fl6->fl6_sport; |
1078 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1079 | uh->len = htons(len); |
1da177e4 LT |
1080 | uh->check = 0; |
1081 | ||
b2bf1e26 | 1082 | if (is_udplite) |
d39d938c VY |
1083 | csum = udplite_csum(skb); |
1084 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1085 | skb->ip_summed = CHECKSUM_NONE; |
1086 | goto send; | |
1087 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1088 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1089 | goto send; |
1090 | } else | |
d39d938c | 1091 | csum = udp_csum(skb); |
1da177e4 | 1092 | |
ba4e58ec | 1093 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1094 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1095 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1096 | if (uh->check == 0) |
f6ab0288 | 1097 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1098 | |
493c6be3 | 1099 | send: |
d39d938c | 1100 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1101 | if (err) { |
1102 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1103 | UDP6_INC_STATS_USER(sock_net(sk), | |
1104 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1105 | err = 0; | |
1106 | } | |
1107 | } else | |
1108 | UDP6_INC_STATS_USER(sock_net(sk), | |
1109 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
d39d938c VY |
1110 | return err; |
1111 | } | |
1112 | ||
1113 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1114 | { | |
1115 | struct sk_buff *skb; | |
1116 | struct udp_sock *up = udp_sk(sk); | |
1117 | struct flowi6 fl6; | |
1118 | int err = 0; | |
1119 | ||
1120 | if (up->pending == AF_INET) | |
1121 | return udp_push_pending_frames(sk); | |
1122 | ||
1123 | /* ip6_finish_skb will release the cork, so make a copy of | |
1124 | * fl6 here. | |
1125 | */ | |
1126 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1127 | ||
1128 | skb = ip6_finish_skb(sk); | |
1129 | if (!skb) | |
1130 | goto out; | |
1131 | ||
1132 | err = udp_v6_send_skb(skb, &fl6); | |
1133 | ||
1da177e4 LT |
1134 | out: |
1135 | up->len = 0; | |
1136 | up->pending = 0; | |
1137 | return err; | |
1138 | } | |
1139 | ||
1b784140 | 1140 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1141 | { |
1142 | struct ipv6_txoptions opt_space; | |
1143 | struct udp_sock *up = udp_sk(sk); | |
1144 | struct inet_sock *inet = inet_sk(sk); | |
1145 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1146 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1147 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1148 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1149 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1150 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1151 | struct flowi6 fl6; |
1da177e4 LT |
1152 | struct dst_entry *dst; |
1153 | int addr_len = msg->msg_namelen; | |
1154 | int ulen = len; | |
1155 | int hlimit = -1; | |
41a1f8ea | 1156 | int tclass = -1; |
13b52cd4 | 1157 | int dontfrag = -1; |
1da177e4 LT |
1158 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1159 | int err; | |
987905de | 1160 | int connected = 0; |
b2bf1e26 | 1161 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1162 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1163 | |
1164 | /* destination address check */ | |
1165 | if (sin6) { | |
1166 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | switch (sin6->sin6_family) { | |
1170 | case AF_INET6: | |
1171 | if (addr_len < SIN6_LEN_RFC2133) | |
1172 | return -EINVAL; | |
1173 | daddr = &sin6->sin6_addr; | |
1174 | break; | |
1175 | case AF_INET: | |
1176 | goto do_udp_sendmsg; | |
1177 | case AF_UNSPEC: | |
1178 | msg->msg_name = sin6 = NULL; | |
1179 | msg->msg_namelen = addr_len = 0; | |
1180 | daddr = NULL; | |
1181 | break; | |
1182 | default: | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | } else if (!up->pending) { | |
1186 | if (sk->sk_state != TCP_ESTABLISHED) | |
1187 | return -EDESTADDRREQ; | |
efe4208f | 1188 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1189 | } else |
1da177e4 LT |
1190 | daddr = NULL; |
1191 | ||
1192 | if (daddr) { | |
e773e4fa | 1193 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1194 | struct sockaddr_in sin; |
1195 | sin.sin_family = AF_INET; | |
c720c7e8 | 1196 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1197 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1198 | msg->msg_name = &sin; | |
1199 | msg->msg_namelen = sizeof(sin); | |
1200 | do_udp_sendmsg: | |
1201 | if (__ipv6_only_sock(sk)) | |
1202 | return -ENETUNREACH; | |
1b784140 | 1203 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1204 | } |
1205 | } | |
1206 | ||
1207 | if (up->pending == AF_INET) | |
1b784140 | 1208 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1209 | |
1210 | /* Rough check on arithmetic overflow, | |
b59e139b | 1211 | better check is made in ip6_append_data(). |
1da177e4 LT |
1212 | */ |
1213 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1214 | return -EMSGSIZE; | |
1ab1457c | 1215 | |
03485f2a | 1216 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1217 | if (up->pending) { |
1218 | /* | |
1219 | * There are pending frames. | |
1220 | * The socket lock must be held while it's corked. | |
1221 | */ | |
1222 | lock_sock(sk); | |
1223 | if (likely(up->pending)) { | |
1224 | if (unlikely(up->pending != AF_INET6)) { | |
1225 | release_sock(sk); | |
1226 | return -EAFNOSUPPORT; | |
1227 | } | |
1228 | dst = NULL; | |
1229 | goto do_append_data; | |
1230 | } | |
1231 | release_sock(sk); | |
1232 | } | |
1233 | ulen += sizeof(struct udphdr); | |
1234 | ||
4c9483b2 | 1235 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1236 | |
1237 | if (sin6) { | |
1238 | if (sin6->sin6_port == 0) | |
1239 | return -EINVAL; | |
1240 | ||
1958b856 | 1241 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1242 | daddr = &sin6->sin6_addr; |
1243 | ||
1244 | if (np->sndflow) { | |
4c9483b2 DM |
1245 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1246 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1247 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1248 | if (!flowlabel) |
1da177e4 | 1249 | return -EINVAL; |
1da177e4 LT |
1250 | } |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * Otherwise it will be difficult to maintain | |
1255 | * sk->sk_dst_cache. | |
1256 | */ | |
1257 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1258 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1259 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1260 | |
1261 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1262 | sin6->sin6_scope_id && | |
842df073 | 1263 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1264 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1265 | } else { |
1266 | if (sk->sk_state != TCP_ESTABLISHED) | |
1267 | return -EDESTADDRREQ; | |
1268 | ||
1958b856 | 1269 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1270 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1271 | fl6.flowlabel = np->flow_label; |
987905de | 1272 | connected = 1; |
1da177e4 LT |
1273 | } |
1274 | ||
4c9483b2 DM |
1275 | if (!fl6.flowi6_oif) |
1276 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1277 | |
4c9483b2 DM |
1278 | if (!fl6.flowi6_oif) |
1279 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1280 | |
4c9483b2 | 1281 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1282 | |
1da177e4 LT |
1283 | if (msg->msg_controllen) { |
1284 | opt = &opt_space; | |
1285 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1286 | opt->tot_len = sizeof(*opt); | |
1287 | ||
73df66f8 TP |
1288 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1289 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1290 | if (err < 0) { |
1291 | fl6_sock_release(flowlabel); | |
1292 | return err; | |
1293 | } | |
4c9483b2 DM |
1294 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1295 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1296 | if (!flowlabel) |
1da177e4 LT |
1297 | return -EINVAL; |
1298 | } | |
1299 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1300 | opt = NULL; | |
987905de | 1301 | connected = 0; |
1da177e4 | 1302 | } |
45f6fad8 ED |
1303 | if (!opt) { |
1304 | opt = txopt_get(np); | |
1305 | opt_to_free = opt; | |
1306 | } | |
df9890c3 YH |
1307 | if (flowlabel) |
1308 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1309 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1310 | |
4c9483b2 | 1311 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1312 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1313 | fl6.daddr = *daddr; |
876c7f41 | 1314 | else |
4c9483b2 DM |
1315 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1316 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1317 | fl6.saddr = np->saddr; |
1958b856 | 1318 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1319 | |
4c9483b2 | 1320 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1321 | if (final_p) |
987905de | 1322 | connected = 0; |
1da177e4 | 1323 | |
4c9483b2 DM |
1324 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1325 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1326 | connected = 0; |
c4062dfc EH |
1327 | } else if (!fl6.flowi6_oif) |
1328 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1329 | |
4c9483b2 | 1330 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1331 | |
0e0d44ab | 1332 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1333 | if (IS_ERR(dst)) { |
1334 | err = PTR_ERR(dst); | |
1335 | dst = NULL; | |
1da177e4 | 1336 | goto out; |
14e50e57 | 1337 | } |
1da177e4 | 1338 | |
5c98631c LC |
1339 | if (hlimit < 0) |
1340 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1341 | |
e651f03a | 1342 | if (tclass < 0) |
41a1f8ea | 1343 | tclass = np->tclass; |
41a1f8ea | 1344 | |
1da177e4 LT |
1345 | if (msg->msg_flags&MSG_CONFIRM) |
1346 | goto do_confirm; | |
1347 | back_from_confirm: | |
1348 | ||
03485f2a VY |
1349 | /* Lockless fast path for the non-corking case */ |
1350 | if (!corkreq) { | |
1351 | struct sk_buff *skb; | |
1352 | ||
1353 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
1354 | sizeof(struct udphdr), hlimit, tclass, opt, | |
1355 | &fl6, (struct rt6_info *)dst, | |
1356 | msg->msg_flags, dontfrag); | |
1357 | err = PTR_ERR(skb); | |
1358 | if (!IS_ERR_OR_NULL(skb)) | |
1359 | err = udp_v6_send_skb(skb, &fl6); | |
1360 | goto release_dst; | |
1361 | } | |
1362 | ||
1da177e4 LT |
1363 | lock_sock(sk); |
1364 | if (unlikely(up->pending)) { | |
1365 | /* The socket is already corked while preparing it. */ | |
1366 | /* ... which is an evident application bug. --ANK */ | |
1367 | release_sock(sk); | |
1368 | ||
ba7a46f1 | 1369 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1370 | err = -EINVAL; |
1371 | goto out; | |
1372 | } | |
1373 | ||
1374 | up->pending = AF_INET6; | |
1375 | ||
1376 | do_append_data: | |
e36d3ff9 JP |
1377 | if (dontfrag < 0) |
1378 | dontfrag = np->dontfrag; | |
1da177e4 | 1379 | up->len += ulen; |
f69e6d13 | 1380 | err = ip6_append_data(sk, getfrag, msg, ulen, |
4c9483b2 | 1381 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
67ba4152 | 1382 | (struct rt6_info *)dst, |
13b52cd4 | 1383 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1384 | if (err) |
1385 | udp_v6_flush_pending_frames(sk); | |
1386 | else if (!corkreq) | |
4c0a6cb0 | 1387 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1388 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1389 | up->pending = 0; | |
1da177e4 | 1390 | |
03485f2a VY |
1391 | if (err > 0) |
1392 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1393 | release_sock(sk); | |
1394 | ||
1395 | release_dst: | |
a5e7c210 DM |
1396 | if (dst) { |
1397 | if (connected) { | |
1398 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1399 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1400 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1401 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1402 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1403 | &np->saddr : |
1404 | #endif | |
1405 | NULL); | |
a5e7c210 DM |
1406 | } else { |
1407 | dst_release(dst); | |
1408 | } | |
a3c96089 | 1409 | dst = NULL; |
a5e7c210 DM |
1410 | } |
1411 | ||
1da177e4 | 1412 | out: |
a3c96089 | 1413 | dst_release(dst); |
1da177e4 | 1414 | fl6_sock_release(flowlabel); |
45f6fad8 | 1415 | txopt_put(opt_to_free); |
cd562c98 | 1416 | if (!err) |
1da177e4 | 1417 | return len; |
a18135eb DM |
1418 | /* |
1419 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1420 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1421 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1422 | * things). We could add another new stat but at least for now that | |
1423 | * seems like overkill. | |
1424 | */ | |
1425 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1426 | UDP6_INC_STATS_USER(sock_net(sk), |
1427 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1428 | } |
1da177e4 LT |
1429 | return err; |
1430 | ||
1431 | do_confirm: | |
1432 | dst_confirm(dst); | |
1433 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1434 | goto back_from_confirm; | |
1435 | err = 0; | |
1436 | goto out; | |
1437 | } | |
1438 | ||
7d06b2e0 | 1439 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1440 | { |
44046a59 | 1441 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1442 | lock_sock(sk); |
1443 | udp_v6_flush_pending_frames(sk); | |
1444 | release_sock(sk); | |
1445 | ||
44046a59 TP |
1446 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1447 | void (*encap_destroy)(struct sock *sk); | |
1448 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1449 | if (encap_destroy) | |
1450 | encap_destroy(sk); | |
1451 | } | |
1452 | ||
1da177e4 | 1453 | inet6_destroy_sock(sk); |
1da177e4 LT |
1454 | } |
1455 | ||
1456 | /* | |
1457 | * Socket option code for UDP | |
1458 | */ | |
ba4e58ec | 1459 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1460 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1461 | { |
db8dac20 | 1462 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1463 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1464 | udp_v6_push_pending_frames); | |
ba4e58ec | 1465 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1466 | } |
1467 | ||
1468 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1469 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1470 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1471 | { |
db8dac20 | 1472 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1473 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1474 | udp_v6_push_pending_frames); | |
ba4e58ec | 1475 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1476 | } |
1477 | #endif | |
1478 | ||
ba4e58ec GR |
1479 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1480 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1481 | { |
db8dac20 | 1482 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1483 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1484 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1485 | } |
1486 | ||
1487 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1488 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1489 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1490 | { |
db8dac20 | 1491 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1492 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1493 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1494 | } |
1495 | #endif | |
1496 | ||
41135cc8 | 1497 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1498 | .handler = udpv6_rcv, |
1499 | .err_handler = udpv6_err, | |
1500 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1501 | }; | |
1502 | ||
1503 | /* ------------------------------------------------------------------------ */ | |
1504 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1505 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1506 | { |
17ef66af LC |
1507 | if (v == SEQ_START_TOKEN) { |
1508 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1509 | } else { | |
1510 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1511 | struct inet_sock *inet = inet_sk(v); | |
1512 | __u16 srcp = ntohs(inet->inet_sport); | |
1513 | __u16 destp = ntohs(inet->inet_dport); | |
1514 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1515 | } | |
1da177e4 LT |
1516 | return 0; |
1517 | } | |
1518 | ||
73cb88ec AV |
1519 | static const struct file_operations udp6_afinfo_seq_fops = { |
1520 | .owner = THIS_MODULE, | |
1521 | .open = udp_seq_open, | |
1522 | .read = seq_read, | |
1523 | .llseek = seq_lseek, | |
1524 | .release = seq_release_net | |
1525 | }; | |
1526 | ||
1da177e4 | 1527 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1528 | .name = "udp6", |
1529 | .family = AF_INET6, | |
645ca708 | 1530 | .udp_table = &udp_table, |
73cb88ec | 1531 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1532 | .seq_ops = { |
1533 | .show = udp6_seq_show, | |
1534 | }, | |
1da177e4 LT |
1535 | }; |
1536 | ||
2c8c1e72 | 1537 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1538 | { |
0c96d8c5 | 1539 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1540 | } |
1541 | ||
ec120da6 IM |
1542 | void udp6_proc_exit(struct net *net) |
1543 | { | |
0c96d8c5 | 1544 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1545 | } |
1546 | #endif /* CONFIG_PROC_FS */ | |
1547 | ||
f77d6021 ED |
1548 | void udp_v6_clear_sk(struct sock *sk, int size) |
1549 | { | |
1550 | struct inet_sock *inet = inet_sk(sk); | |
1551 | ||
1552 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1553 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1554 | ||
1555 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1556 | memset(&inet->pinet6 + 1, 0, size); | |
1557 | } | |
1558 | ||
1da177e4 LT |
1559 | /* ------------------------------------------------------------------------ */ |
1560 | ||
1561 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1562 | .name = "UDPv6", |
1563 | .owner = THIS_MODULE, | |
ba4e58ec | 1564 | .close = udp_lib_close, |
543d9cfe ACM |
1565 | .connect = ip6_datagram_connect, |
1566 | .disconnect = udp_disconnect, | |
1567 | .ioctl = udp_ioctl, | |
1568 | .destroy = udpv6_destroy_sock, | |
1569 | .setsockopt = udpv6_setsockopt, | |
1570 | .getsockopt = udpv6_getsockopt, | |
1571 | .sendmsg = udpv6_sendmsg, | |
1572 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1573 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1574 | .hash = udp_lib_hash, |
1575 | .unhash = udp_lib_unhash, | |
719f8358 | 1576 | .rehash = udp_v6_rehash, |
543d9cfe | 1577 | .get_port = udp_v6_get_port, |
95766fff HA |
1578 | .memory_allocated = &udp_memory_allocated, |
1579 | .sysctl_mem = sysctl_udp_mem, | |
1580 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1581 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1582 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1583 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1584 | .h.udp_table = &udp_table, |
3fdadf7d | 1585 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1586 | .compat_setsockopt = compat_udpv6_setsockopt, |
1587 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1588 | #endif |
f77d6021 | 1589 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1590 | }; |
1591 | ||
1da177e4 LT |
1592 | static struct inet_protosw udpv6_protosw = { |
1593 | .type = SOCK_DGRAM, | |
1594 | .protocol = IPPROTO_UDP, | |
1595 | .prot = &udpv6_prot, | |
1596 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1597 | .flags = INET_PROTOSW_PERMANENT, |
1598 | }; | |
1599 | ||
7f4e4868 | 1600 | int __init udpv6_init(void) |
1da177e4 | 1601 | { |
7f4e4868 DL |
1602 | int ret; |
1603 | ||
3336288a VY |
1604 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1605 | if (ret) | |
c6b641a4 | 1606 | goto out; |
3336288a | 1607 | |
7f4e4868 DL |
1608 | ret = inet6_register_protosw(&udpv6_protosw); |
1609 | if (ret) | |
1610 | goto out_udpv6_protocol; | |
1611 | out: | |
1612 | return ret; | |
1613 | ||
1614 | out_udpv6_protocol: | |
1615 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1616 | goto out; | |
1617 | } | |
1618 | ||
09f7709f | 1619 | void udpv6_exit(void) |
7f4e4868 DL |
1620 | { |
1621 | inet6_unregister_protosw(&udpv6_protosw); | |
1622 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1623 | } |