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 | ||
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 | 259 | int score, badness, matches = 0, reuseport = 0; |
ed0dfffd | 260 | bool select_ok = true; |
72289b96 | 261 | u32 hash = 0; |
fddc17de ED |
262 | |
263 | begin: | |
264 | result = NULL; | |
265 | badness = -1; | |
266 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
267 | score = compute_score2(sk, net, saddr, sport, | |
268 | daddr, hnum, dif); | |
269 | if (score > badness) { | |
270 | result = sk; | |
271 | badness = score; | |
72289b96 TH |
272 | reuseport = sk->sk_reuseport; |
273 | if (reuseport) { | |
b50026b5 HFS |
274 | hash = udp6_ehashfn(net, daddr, hnum, |
275 | saddr, sport); | |
ed0dfffd ED |
276 | if (select_ok) { |
277 | struct sock *sk2; | |
278 | ||
279 | sk2 = reuseport_select_sock(sk, hash, skb, | |
280 | sizeof(struct udphdr)); | |
281 | if (sk2) { | |
282 | result = sk2; | |
283 | select_ok = false; | |
284 | goto found; | |
285 | } | |
e32ea7e7 | 286 | } |
72289b96 | 287 | matches = 1; |
70da268b | 288 | } |
72289b96 TH |
289 | } else if (score == badness && reuseport) { |
290 | matches++; | |
8fc54f68 | 291 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
292 | result = sk; |
293 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
294 | } |
295 | } | |
296 | /* | |
297 | * if the nulls value we got at the end of this lookup is | |
298 | * not the expected one, we must restart lookup. | |
299 | * We probably met an item that was moved to another chain. | |
300 | */ | |
301 | if (get_nulls_value(node) != slot2) | |
302 | goto begin; | |
303 | ||
304 | if (result) { | |
e32ea7e7 | 305 | found: |
c31504dc | 306 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
307 | result = NULL; |
308 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
309 | daddr, hnum, dif) < badness)) { | |
310 | sock_put(result); | |
311 | goto begin; | |
312 | } | |
313 | } | |
314 | return result; | |
315 | } | |
316 | ||
fce82338 | 317 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
318 | const struct in6_addr *saddr, __be16 sport, |
319 | const struct in6_addr *daddr, __be16 dport, | |
538950a1 CG |
320 | int dif, struct udp_table *udptable, |
321 | struct sk_buff *skb) | |
1da177e4 | 322 | { |
271b72c7 | 323 | struct sock *sk, *result; |
88ab1932 | 324 | struct hlist_nulls_node *node; |
1da177e4 | 325 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
326 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
327 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 | 328 | int score, badness, matches = 0, reuseport = 0; |
ed0dfffd | 329 | bool select_ok = true; |
72289b96 | 330 | u32 hash = 0; |
645ca708 | 331 | |
271b72c7 | 332 | rcu_read_lock(); |
fddc17de ED |
333 | if (hslot->count > 10) { |
334 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
335 | slot2 = hash2 & udptable->mask; | |
336 | hslot2 = &udptable->hash2[slot2]; | |
337 | if (hslot->count < hslot2->count) | |
338 | goto begin; | |
339 | ||
340 | result = udp6_lib_lookup2(net, saddr, sport, | |
341 | daddr, hnum, dif, | |
1134158b | 342 | hslot2, slot2, skb); |
fddc17de ED |
343 | if (!result) { |
344 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
345 | slot2 = hash2 & udptable->mask; | |
346 | hslot2 = &udptable->hash2[slot2]; | |
347 | if (hslot->count < hslot2->count) | |
348 | goto begin; | |
349 | ||
1223c67c JBD |
350 | result = udp6_lib_lookup2(net, saddr, sport, |
351 | &in6addr_any, hnum, dif, | |
1134158b | 352 | hslot2, slot2, skb); |
fddc17de ED |
353 | } |
354 | rcu_read_unlock(); | |
355 | return result; | |
356 | } | |
271b72c7 ED |
357 | begin: |
358 | result = NULL; | |
359 | badness = -1; | |
88ab1932 | 360 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
361 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
362 | if (score > badness) { | |
363 | result = sk; | |
364 | badness = score; | |
72289b96 TH |
365 | reuseport = sk->sk_reuseport; |
366 | if (reuseport) { | |
b50026b5 HFS |
367 | hash = udp6_ehashfn(net, daddr, hnum, |
368 | saddr, sport); | |
ed0dfffd ED |
369 | if (select_ok) { |
370 | struct sock *sk2; | |
371 | ||
372 | sk2 = reuseport_select_sock(sk, hash, skb, | |
538950a1 | 373 | sizeof(struct udphdr)); |
ed0dfffd ED |
374 | if (sk2) { |
375 | result = sk2; | |
376 | select_ok = false; | |
377 | goto found; | |
378 | } | |
e32ea7e7 | 379 | } |
72289b96 TH |
380 | matches = 1; |
381 | } | |
382 | } else if (score == badness && reuseport) { | |
383 | matches++; | |
8fc54f68 | 384 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
385 | result = sk; |
386 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
387 | } |
388 | } | |
88ab1932 ED |
389 | /* |
390 | * if the nulls value we got at the end of this lookup is | |
391 | * not the expected one, we must restart lookup. | |
392 | * We probably met an item that was moved to another chain. | |
393 | */ | |
fddc17de | 394 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
395 | goto begin; |
396 | ||
271b72c7 | 397 | if (result) { |
e32ea7e7 | 398 | found: |
c31504dc | 399 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
400 | result = NULL; |
401 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
402 | daddr, dport, dif) < badness)) { | |
403 | sock_put(result); | |
404 | goto begin; | |
405 | } | |
406 | } | |
407 | rcu_read_unlock(); | |
1da177e4 LT |
408 | return result; |
409 | } | |
fce82338 | 410 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 411 | |
607c4aaf KK |
412 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
413 | __be16 sport, __be16 dport, | |
645ca708 | 414 | struct udp_table *udptable) |
607c4aaf | 415 | { |
23542618 | 416 | struct sock *sk; |
b71d1d42 | 417 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 418 | |
e5d08d71 IM |
419 | sk = skb_steal_sock(skb); |
420 | if (unlikely(sk)) | |
23542618 | 421 | return sk; |
adf30907 ED |
422 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
423 | &iph->daddr, dport, inet6_iif(skb), | |
538950a1 | 424 | udptable, skb); |
607c4aaf KK |
425 | } |
426 | ||
aa976fc0 BS |
427 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
428 | const struct in6_addr *daddr, __be16 dport, int dif) | |
429 | { | |
538950a1 | 430 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL); |
aa976fc0 BS |
431 | } |
432 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
433 | ||
1da177e4 | 434 | /* |
67ba4152 IM |
435 | * This should be easy, if there is something there we |
436 | * return it, otherwise we block. | |
1da177e4 LT |
437 | */ |
438 | ||
1b784140 | 439 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
440 | int noblock, int flags, int *addr_len) |
441 | { | |
442 | struct ipv6_pinfo *np = inet6_sk(sk); | |
443 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 444 | struct sk_buff *skb; |
59c2cdae | 445 | unsigned int ulen, copied; |
3f518bf7 | 446 | int peeked, off = 0; |
759e5d00 HX |
447 | int err; |
448 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 449 | bool checksum_valid = false; |
f26ba175 | 450 | int is_udp4; |
8a74ad60 | 451 | bool slow; |
1da177e4 | 452 | |
1da177e4 | 453 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 454 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 455 | |
4b340ae2 | 456 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 457 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 458 | |
1da177e4 | 459 | try_again: |
a59322be | 460 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 461 | &peeked, &off, &err); |
1da177e4 LT |
462 | if (!skb) |
463 | goto out; | |
464 | ||
759e5d00 | 465 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
466 | copied = len; |
467 | if (copied > ulen) | |
468 | copied = ulen; | |
469 | else if (copied < ulen) | |
1ab1457c | 470 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 471 | |
f26ba175 WY |
472 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
473 | ||
ba4e58ec | 474 | /* |
759e5d00 HX |
475 | * If checksum is needed at all, try to do it while copying the |
476 | * data. If the data is truncated, or if we only want a partial | |
477 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 478 | */ |
ba4e58ec | 479 | |
59c2cdae | 480 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
197c949e ED |
481 | checksum_valid = !udp_lib_checksum_complete(skb); |
482 | if (!checksum_valid) | |
1da177e4 | 483 | goto csum_copy_err; |
ba4e58ec GR |
484 | } |
485 | ||
197c949e | 486 | if (checksum_valid || skb_csum_unnecessary(skb)) |
51f3d02b DM |
487 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
488 | msg, copied); | |
ba4e58ec | 489 | else { |
227158db | 490 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); |
1da177e4 LT |
491 | if (err == -EINVAL) |
492 | goto csum_copy_err; | |
493 | } | |
22911fc5 ED |
494 | if (unlikely(err)) { |
495 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
496 | if (!peeked) { |
497 | atomic_inc(&sk->sk_drops); | |
498 | if (is_udp4) | |
499 | UDP_INC_STATS_USER(sock_net(sk), | |
500 | UDP_MIB_INERRORS, | |
501 | is_udplite); | |
502 | else | |
503 | UDP6_INC_STATS_USER(sock_net(sk), | |
504 | UDP_MIB_INERRORS, | |
505 | is_udplite); | |
506 | } | |
1da177e4 | 507 | goto out_free; |
22911fc5 | 508 | } |
f26ba175 WY |
509 | if (!peeked) { |
510 | if (is_udp4) | |
511 | UDP_INC_STATS_USER(sock_net(sk), | |
512 | UDP_MIB_INDATAGRAMS, is_udplite); | |
513 | else | |
514 | UDP6_INC_STATS_USER(sock_net(sk), | |
515 | UDP_MIB_INDATAGRAMS, is_udplite); | |
516 | } | |
cb75994e | 517 | |
3b885787 | 518 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
519 | |
520 | /* Copy the address. */ | |
521 | if (msg->msg_name) { | |
342dfc30 | 522 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 523 | sin6->sin6_family = AF_INET6; |
4bedb452 | 524 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 525 | sin6->sin6_flowinfo = 0; |
1da177e4 | 526 | |
842df073 | 527 | if (is_udp4) { |
b301e82c BH |
528 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
529 | &sin6->sin6_addr); | |
842df073 HFS |
530 | sin6->sin6_scope_id = 0; |
531 | } else { | |
4e3fd7a0 | 532 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
533 | sin6->sin6_scope_id = |
534 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 535 | inet6_iif(skb)); |
1da177e4 | 536 | } |
bceaa902 | 537 | *addr_len = sizeof(*sin6); |
1da177e4 | 538 | } |
4b261c75 HFS |
539 | |
540 | if (np->rxopt.all) | |
541 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
542 | ||
f26ba175 | 543 | if (is_udp4) { |
1da177e4 LT |
544 | if (inet->cmsg_flags) |
545 | ip_cmsg_recv(msg, skb); | |
546 | } else { | |
547 | if (np->rxopt.all) | |
4b261c75 | 548 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 549 | } |
1da177e4 | 550 | |
59c2cdae | 551 | err = copied; |
1da177e4 | 552 | if (flags & MSG_TRUNC) |
759e5d00 | 553 | err = ulen; |
1da177e4 LT |
554 | |
555 | out_free: | |
9d410c79 | 556 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
557 | out: |
558 | return err; | |
559 | ||
560 | csum_copy_err: | |
8a74ad60 | 561 | slow = lock_sock_fast(sk); |
0856f939 | 562 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
563 | if (is_udp4) { |
564 | UDP_INC_STATS_USER(sock_net(sk), | |
565 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
566 | UDP_INC_STATS_USER(sock_net(sk), |
567 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
568 | } else { |
569 | UDP6_INC_STATS_USER(sock_net(sk), | |
570 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
571 | UDP6_INC_STATS_USER(sock_net(sk), |
572 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 573 | } |
0856f939 | 574 | } |
8a74ad60 | 575 | unlock_sock_fast(sk, slow); |
1da177e4 | 576 | |
beb39db5 ED |
577 | /* starting over for a new packet, but check if we need to yield */ |
578 | cond_resched(); | |
9cfaa8de | 579 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
580 | goto try_again; |
581 | } | |
582 | ||
ba4e58ec | 583 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 584 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 585 | struct udp_table *udptable) |
1da177e4 LT |
586 | { |
587 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
588 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
589 | const struct in6_addr *saddr = &hdr->saddr; | |
590 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 591 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 LT |
592 | struct sock *sk; |
593 | int err; | |
7304fe46 | 594 | struct net *net = dev_net(skb->dev); |
1da177e4 | 595 | |
e32ea7e7 | 596 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 597 | inet6_iif(skb), udptable, skb); |
63159f29 | 598 | if (!sk) { |
7304fe46 DJ |
599 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
600 | ICMP6_MIB_INERRORS); | |
1da177e4 | 601 | return; |
7304fe46 | 602 | } |
1da177e4 | 603 | |
93b36cf3 HFS |
604 | if (type == ICMPV6_PKT_TOOBIG) { |
605 | if (!ip6_sk_accept_pmtu(sk)) | |
606 | goto out; | |
81aded24 | 607 | ip6_sk_update_pmtu(skb, sk, info); |
93b36cf3 | 608 | } |
1a462d18 | 609 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 610 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
611 | goto out; |
612 | } | |
81aded24 | 613 | |
1da177e4 LT |
614 | np = inet6_sk(sk); |
615 | ||
616 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
617 | goto out; | |
618 | ||
619 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
620 | goto out; | |
621 | ||
b1faf566 | 622 | if (np->recverr) |
1da177e4 | 623 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 624 | |
1da177e4 LT |
625 | sk->sk_err = err; |
626 | sk->sk_error_report(sk); | |
627 | out: | |
628 | sock_put(sk); | |
629 | } | |
630 | ||
f7ad74fe BL |
631 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
632 | { | |
633 | int rc; | |
634 | ||
efe4208f | 635 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 636 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 637 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 638 | sk_incoming_cpu_update(sk); |
005ec974 | 639 | } |
f7ad74fe BL |
640 | |
641 | rc = sock_queue_rcv_skb(sk, skb); | |
642 | if (rc < 0) { | |
643 | int is_udplite = IS_UDPLITE(sk); | |
644 | ||
645 | /* Note that an ENOMEM error is charged twice */ | |
646 | if (rc == -ENOMEM) | |
647 | UDP6_INC_STATS_BH(sock_net(sk), | |
648 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
649 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
650 | kfree_skb(skb); | |
651 | return -1; | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
ba4e58ec | 656 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 657 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 658 | u8 code, int offset, __be32 info) |
ba4e58ec | 659 | { |
645ca708 | 660 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
661 | } |
662 | ||
d7f3f621 BL |
663 | static struct static_key udpv6_encap_needed __read_mostly; |
664 | void udpv6_encap_enable(void) | |
665 | { | |
666 | if (!static_key_enabled(&udpv6_encap_needed)) | |
667 | static_key_slow_inc(&udpv6_encap_needed); | |
668 | } | |
669 | EXPORT_SYMBOL(udpv6_encap_enable); | |
670 | ||
f7ad74fe | 671 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 672 | { |
ba4e58ec | 673 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 674 | int rc; |
b2bf1e26 | 675 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 676 | |
ba4e58ec GR |
677 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
678 | goto drop; | |
1da177e4 | 679 | |
d7f3f621 BL |
680 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
681 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
682 | ||
683 | /* | |
684 | * This is an encapsulation socket so pass the skb to | |
685 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
686 | * fall through and pass this up the UDP socket. | |
687 | * up->encap_rcv() returns the following value: | |
688 | * =0 if skb was successfully passed to the encap | |
689 | * handler or was discarded by it. | |
690 | * >0 if skb should be passed on to UDP. | |
691 | * <0 if skb should be resubmitted as proto -N | |
692 | */ | |
693 | ||
694 | /* if we're overly short, let UDP handle it */ | |
695 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 696 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
697 | int ret; |
698 | ||
0a80966b TH |
699 | /* Verify checksum before giving to encap */ |
700 | if (udp_lib_checksum_complete(skb)) | |
701 | goto csum_error; | |
702 | ||
d7f3f621 BL |
703 | ret = encap_rcv(sk, skb); |
704 | if (ret <= 0) { | |
705 | UDP_INC_STATS_BH(sock_net(sk), | |
706 | UDP_MIB_INDATAGRAMS, | |
707 | is_udplite); | |
708 | return -ret; | |
709 | } | |
710 | } | |
711 | ||
712 | /* FALLTHROUGH -- it's a UDP Packet */ | |
713 | } | |
714 | ||
ba4e58ec GR |
715 | /* |
716 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
717 | */ | |
b2bf1e26 | 718 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
719 | |
720 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
721 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
722 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
723 | goto drop; |
724 | } | |
725 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
726 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
727 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
728 | goto drop; |
729 | } | |
1da177e4 LT |
730 | } |
731 | ||
33d480ce | 732 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 733 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 734 | goto csum_error; |
1ab6eb62 | 735 | } |
ba4e58ec | 736 | |
274f482d | 737 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
3e215c8d JL |
738 | UDP6_INC_STATS_BH(sock_net(sk), |
739 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 740 | goto drop; |
3e215c8d | 741 | } |
cb80ef46 | 742 | |
d826eb14 | 743 | skb_dst_drop(skb); |
cb75994e | 744 | |
cb80ef46 BL |
745 | bh_lock_sock(sk); |
746 | rc = 0; | |
747 | if (!sock_owned_by_user(sk)) | |
748 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
749 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
750 | bh_unlock_sock(sk); | |
751 | goto drop; | |
752 | } | |
753 | bh_unlock_sock(sk); | |
f7ad74fe BL |
754 | |
755 | return rc; | |
3e215c8d | 756 | |
6a5dc9e5 ED |
757 | csum_error: |
758 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 759 | drop: |
ef28d1a2 | 760 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 761 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
762 | kfree_skb(skb); |
763 | return -1; | |
1da177e4 LT |
764 | } |
765 | ||
5cf3d461 DH |
766 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
767 | __be16 loc_port, const struct in6_addr *loc_addr, | |
768 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
769 | int dif, unsigned short hnum) | |
1da177e4 | 770 | { |
5cf3d461 | 771 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 772 | |
5cf3d461 DH |
773 | if (!net_eq(sock_net(sk), net)) |
774 | return false; | |
775 | ||
776 | if (udp_sk(sk)->udp_port_hash != hnum || | |
777 | sk->sk_family != PF_INET6 || | |
778 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
779 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
780 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
781 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
782 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
783 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
784 | return false; |
785 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
786 | return false; | |
787 | return true; | |
1da177e4 LT |
788 | } |
789 | ||
a1ab77f9 ED |
790 | static void flush_stack(struct sock **stack, unsigned int count, |
791 | struct sk_buff *skb, unsigned int final) | |
792 | { | |
cb80ef46 | 793 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 794 | struct sock *sk; |
cb80ef46 | 795 | unsigned int i; |
a1ab77f9 ED |
796 | |
797 | for (i = 0; i < count; i++) { | |
f6b8f32c | 798 | sk = stack[i]; |
63159f29 | 799 | if (likely(!skb1)) |
cb80ef46 BL |
800 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
801 | if (!skb1) { | |
802 | atomic_inc(&sk->sk_drops); | |
803 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
804 | IS_UDPLITE(sk)); | |
805 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
806 | IS_UDPLITE(sk)); | |
a1ab77f9 | 807 | } |
cb80ef46 BL |
808 | |
809 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
810 | skb1 = NULL; | |
2dc41cff | 811 | sock_put(sk); |
a1ab77f9 | 812 | } |
cb80ef46 BL |
813 | if (unlikely(skb1)) |
814 | kfree_skb(skb1); | |
a1ab77f9 | 815 | } |
4068579e TH |
816 | |
817 | static void udp6_csum_zero_error(struct sk_buff *skb) | |
818 | { | |
819 | /* RFC 2460 section 8.1 says that we SHOULD log | |
820 | * this error. Well, it is reasonable. | |
821 | */ | |
ba7a46f1 JP |
822 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
823 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
824 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
825 | } |
826 | ||
1da177e4 LT |
827 | /* |
828 | * Note: called only from the BH handler context, | |
829 | * so we don't need to lock the hashes. | |
830 | */ | |
e3163493 | 831 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 832 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 833 | struct udp_table *udptable, int proto) |
1da177e4 | 834 | { |
a1ab77f9 | 835 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 836 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
837 | struct hlist_nulls_node *node; |
838 | unsigned short hnum = ntohs(uh->dest); | |
839 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
840 | int dif = inet6_iif(skb); | |
2dc41cff DH |
841 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
842 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); | |
36cbb245 | 843 | bool inner_flushed = false; |
2dc41cff DH |
844 | |
845 | if (use_hash2) { | |
846 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
847 | udp_table.mask; | |
848 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
849 | start_lookup: | |
850 | hslot = &udp_table.hash2[hash2]; | |
851 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
852 | } | |
1da177e4 | 853 | |
645ca708 | 854 | spin_lock(&hslot->lock); |
2dc41cff | 855 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
5cf3d461 DH |
856 | if (__udp_v6_is_mcast_sock(net, sk, |
857 | uh->dest, daddr, | |
858 | uh->source, saddr, | |
859 | dif, hnum) && | |
860 | /* If zero checksum and no_check is not on for | |
861 | * the socket then skip it. | |
862 | */ | |
863 | (uh->check || udp_sk(sk)->no_check6_rx)) { | |
864 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
865 | flush_stack(stack, count, skb, ~0); | |
36cbb245 | 866 | inner_flushed = true; |
5cf3d461 DH |
867 | count = 0; |
868 | } | |
4068579e | 869 | stack[count++] = sk; |
2dc41cff | 870 | sock_hold(sk); |
95766fff | 871 | } |
1da177e4 | 872 | } |
a1ab77f9 | 873 | |
645ca708 | 874 | spin_unlock(&hslot->lock); |
a1ab77f9 | 875 | |
2dc41cff DH |
876 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
877 | if (use_hash2 && hash2 != hash2_any) { | |
878 | hash2 = hash2_any; | |
879 | goto start_lookup; | |
880 | } | |
881 | ||
a1ab77f9 ED |
882 | if (count) { |
883 | flush_stack(stack, count, skb, count - 1); | |
a1ab77f9 | 884 | } else { |
36cbb245 RJ |
885 | if (!inner_flushed) |
886 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, | |
887 | proto == IPPROTO_UDPLITE); | |
888 | consume_skb(skb); | |
a1ab77f9 | 889 | } |
ba4e58ec | 890 | return 0; |
1da177e4 LT |
891 | } |
892 | ||
645ca708 | 893 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 894 | int proto) |
1da177e4 | 895 | { |
3ffe533c | 896 | struct net *net = dev_net(skb->dev); |
1da177e4 | 897 | struct sock *sk; |
1ab1457c | 898 | struct udphdr *uh; |
b71d1d42 | 899 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
900 | u32 ulen = 0; |
901 | ||
902 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 903 | goto discard; |
1da177e4 | 904 | |
0660e03f ACM |
905 | saddr = &ipv6_hdr(skb)->saddr; |
906 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 907 | uh = udp_hdr(skb); |
1da177e4 LT |
908 | |
909 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
910 | if (ulen > skb->len) |
911 | goto short_packet; | |
1da177e4 | 912 | |
759e5d00 HX |
913 | if (proto == IPPROTO_UDP) { |
914 | /* UDP validates ulen. */ | |
1da177e4 | 915 | |
ba4e58ec GR |
916 | /* Check for jumbo payload */ |
917 | if (ulen == 0) | |
918 | ulen = skb->len; | |
1da177e4 | 919 | |
ba4e58ec GR |
920 | if (ulen < sizeof(*uh)) |
921 | goto short_packet; | |
1da177e4 | 922 | |
ba4e58ec GR |
923 | if (ulen < skb->len) { |
924 | if (pskb_trim_rcsum(skb, ulen)) | |
925 | goto short_packet; | |
0660e03f ACM |
926 | saddr = &ipv6_hdr(skb)->saddr; |
927 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 928 | uh = udp_hdr(skb); |
ba4e58ec | 929 | } |
ba4e58ec | 930 | } |
1da177e4 | 931 | |
759e5d00 | 932 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 933 | goto csum_error; |
759e5d00 | 934 | |
1ab1457c YH |
935 | /* |
936 | * Multicast receive code | |
1da177e4 | 937 | */ |
ba4e58ec | 938 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 939 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 940 | saddr, daddr, udptable, proto); |
1da177e4 LT |
941 | |
942 | /* Unicast */ | |
943 | ||
1ab1457c | 944 | /* |
1da177e4 LT |
945 | * check socket cache ... must talk to Alan about his plans |
946 | * for sock caches... i'll skip this for now. | |
947 | */ | |
607c4aaf | 948 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 949 | if (sk) { |
a5b50476 ET |
950 | int ret; |
951 | ||
1c19448c | 952 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
79e0f1c9 | 953 | sock_put(sk); |
4068579e TH |
954 | udp6_csum_zero_error(skb); |
955 | goto csum_error; | |
956 | } | |
957 | ||
224d019c | 958 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
959 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
960 | ip6_compute_pseudo); | |
961 | ||
a5b50476 | 962 | ret = udpv6_queue_rcv_skb(sk, skb); |
cb80ef46 | 963 | sock_put(sk); |
1da177e4 | 964 | |
59dca1d8 | 965 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 966 | if (ret > 0) |
59dca1d8 | 967 | return ret; |
1da177e4 | 968 | |
add459aa | 969 | return 0; |
1da177e4 | 970 | } |
1ab1457c | 971 | |
4068579e TH |
972 | if (!uh->check) { |
973 | udp6_csum_zero_error(skb); | |
974 | goto csum_error; | |
975 | } | |
976 | ||
cb80ef46 | 977 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 978 | goto discard; |
cb80ef46 BL |
979 | |
980 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 981 | goto csum_error; |
cb80ef46 BL |
982 | |
983 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
984 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
985 | ||
986 | kfree_skb(skb); | |
add459aa | 987 | return 0; |
1da177e4 | 988 | |
1ab1457c | 989 | short_packet: |
ba7a46f1 JP |
990 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
991 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
992 | saddr, ntohs(uh->source), | |
993 | ulen, skb->len, | |
994 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
995 | goto discard; |
996 | csum_error: | |
997 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 998 | discard: |
ef28d1a2 | 999 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1000 | kfree_skb(skb); |
add459aa | 1001 | return 0; |
1da177e4 | 1002 | } |
ba4e58ec | 1003 | |
e5bbef20 | 1004 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 1005 | { |
645ca708 | 1006 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
1007 | } |
1008 | ||
1da177e4 LT |
1009 | /* |
1010 | * Throw away all pending data and cancel the corking. Socket is locked. | |
1011 | */ | |
1012 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
1013 | { | |
1014 | struct udp_sock *up = udp_sk(sk); | |
1015 | ||
36d926b9 DL |
1016 | if (up->pending == AF_INET) |
1017 | udp_flush_pending_frames(sk); | |
1018 | else if (up->pending) { | |
1da177e4 LT |
1019 | up->len = 0; |
1020 | up->pending = 0; | |
1021 | ip6_flush_pending_frames(sk); | |
1ab1457c | 1022 | } |
1da177e4 LT |
1023 | } |
1024 | ||
493c6be3 | 1025 | /** |
67ba4152 IM |
1026 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
1027 | * @sk: socket we are sending on | |
1028 | * @skb: sk_buff containing the filled-in UDP header | |
1029 | * (checksum field must be zeroed out) | |
493c6be3 SS |
1030 | */ |
1031 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
1032 | const struct in6_addr *saddr, | |
1033 | const struct in6_addr *daddr, int len) | |
1034 | { | |
1035 | unsigned int offset; | |
1036 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1037 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1038 | __wsum csum = 0; |
1039 | ||
d39d938c | 1040 | if (!frags) { |
493c6be3 SS |
1041 | /* Only one fragment on the socket. */ |
1042 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1043 | skb->csum_offset = offsetof(struct udphdr, check); | |
1044 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1045 | } else { | |
1046 | /* | |
1047 | * HW-checksum won't work as there are two or more | |
1048 | * fragments on the socket so that all csums of sk_buffs | |
1049 | * should be together | |
1050 | */ | |
1051 | offset = skb_transport_offset(skb); | |
1052 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1053 | ||
1054 | skb->ip_summed = CHECKSUM_NONE; | |
1055 | ||
d39d938c VY |
1056 | do { |
1057 | csum = csum_add(csum, frags->csum); | |
1058 | } while ((frags = frags->next)); | |
493c6be3 SS |
1059 | |
1060 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1061 | csum); | |
1062 | if (uh->check == 0) | |
1063 | uh->check = CSUM_MANGLED_0; | |
1064 | } | |
1065 | } | |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Sending | |
1069 | */ | |
1070 | ||
d39d938c | 1071 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 1072 | { |
d39d938c | 1073 | struct sock *sk = skb->sk; |
1da177e4 | 1074 | struct udphdr *uh; |
1da177e4 | 1075 | int err = 0; |
b2bf1e26 | 1076 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1077 | __wsum csum = 0; |
d39d938c VY |
1078 | int offset = skb_transport_offset(skb); |
1079 | int len = skb->len - offset; | |
1da177e4 LT |
1080 | |
1081 | /* | |
1082 | * Create a UDP header | |
1083 | */ | |
4bedb452 | 1084 | uh = udp_hdr(skb); |
1958b856 DM |
1085 | uh->source = fl6->fl6_sport; |
1086 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1087 | uh->len = htons(len); |
1da177e4 LT |
1088 | uh->check = 0; |
1089 | ||
b2bf1e26 | 1090 | if (is_udplite) |
d39d938c VY |
1091 | csum = udplite_csum(skb); |
1092 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1093 | skb->ip_summed = CHECKSUM_NONE; |
1094 | goto send; | |
1095 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1096 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1097 | goto send; |
1098 | } else | |
d39d938c | 1099 | csum = udp_csum(skb); |
1da177e4 | 1100 | |
ba4e58ec | 1101 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1102 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1103 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1104 | if (uh->check == 0) |
f6ab0288 | 1105 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1106 | |
493c6be3 | 1107 | send: |
d39d938c | 1108 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1109 | if (err) { |
1110 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1111 | UDP6_INC_STATS_USER(sock_net(sk), | |
1112 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1113 | err = 0; | |
1114 | } | |
1115 | } else | |
1116 | UDP6_INC_STATS_USER(sock_net(sk), | |
1117 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
d39d938c VY |
1118 | return err; |
1119 | } | |
1120 | ||
1121 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1122 | { | |
1123 | struct sk_buff *skb; | |
1124 | struct udp_sock *up = udp_sk(sk); | |
1125 | struct flowi6 fl6; | |
1126 | int err = 0; | |
1127 | ||
1128 | if (up->pending == AF_INET) | |
1129 | return udp_push_pending_frames(sk); | |
1130 | ||
1131 | /* ip6_finish_skb will release the cork, so make a copy of | |
1132 | * fl6 here. | |
1133 | */ | |
1134 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1135 | ||
1136 | skb = ip6_finish_skb(sk); | |
1137 | if (!skb) | |
1138 | goto out; | |
1139 | ||
1140 | err = udp_v6_send_skb(skb, &fl6); | |
1141 | ||
1da177e4 LT |
1142 | out: |
1143 | up->len = 0; | |
1144 | up->pending = 0; | |
1145 | return err; | |
1146 | } | |
1147 | ||
1b784140 | 1148 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1149 | { |
1150 | struct ipv6_txoptions opt_space; | |
1151 | struct udp_sock *up = udp_sk(sk); | |
1152 | struct inet_sock *inet = inet_sk(sk); | |
1153 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1154 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1155 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1156 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1157 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1158 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1159 | struct flowi6 fl6; |
1da177e4 LT |
1160 | struct dst_entry *dst; |
1161 | int addr_len = msg->msg_namelen; | |
1162 | int ulen = len; | |
1163 | int hlimit = -1; | |
41a1f8ea | 1164 | int tclass = -1; |
13b52cd4 | 1165 | int dontfrag = -1; |
1da177e4 LT |
1166 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1167 | int err; | |
987905de | 1168 | int connected = 0; |
b2bf1e26 | 1169 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1170 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1171 | |
1172 | /* destination address check */ | |
1173 | if (sin6) { | |
1174 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1175 | return -EINVAL; | |
1176 | ||
1177 | switch (sin6->sin6_family) { | |
1178 | case AF_INET6: | |
1179 | if (addr_len < SIN6_LEN_RFC2133) | |
1180 | return -EINVAL; | |
1181 | daddr = &sin6->sin6_addr; | |
1182 | break; | |
1183 | case AF_INET: | |
1184 | goto do_udp_sendmsg; | |
1185 | case AF_UNSPEC: | |
1186 | msg->msg_name = sin6 = NULL; | |
1187 | msg->msg_namelen = addr_len = 0; | |
1188 | daddr = NULL; | |
1189 | break; | |
1190 | default: | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | } else if (!up->pending) { | |
1194 | if (sk->sk_state != TCP_ESTABLISHED) | |
1195 | return -EDESTADDRREQ; | |
efe4208f | 1196 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1197 | } else |
1da177e4 LT |
1198 | daddr = NULL; |
1199 | ||
1200 | if (daddr) { | |
e773e4fa | 1201 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1202 | struct sockaddr_in sin; |
1203 | sin.sin_family = AF_INET; | |
c720c7e8 | 1204 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1205 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1206 | msg->msg_name = &sin; | |
1207 | msg->msg_namelen = sizeof(sin); | |
1208 | do_udp_sendmsg: | |
1209 | if (__ipv6_only_sock(sk)) | |
1210 | return -ENETUNREACH; | |
1b784140 | 1211 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1212 | } |
1213 | } | |
1214 | ||
1215 | if (up->pending == AF_INET) | |
1b784140 | 1216 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1217 | |
1218 | /* Rough check on arithmetic overflow, | |
b59e139b | 1219 | better check is made in ip6_append_data(). |
1da177e4 LT |
1220 | */ |
1221 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1222 | return -EMSGSIZE; | |
1ab1457c | 1223 | |
03485f2a | 1224 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1225 | if (up->pending) { |
1226 | /* | |
1227 | * There are pending frames. | |
1228 | * The socket lock must be held while it's corked. | |
1229 | */ | |
1230 | lock_sock(sk); | |
1231 | if (likely(up->pending)) { | |
1232 | if (unlikely(up->pending != AF_INET6)) { | |
1233 | release_sock(sk); | |
1234 | return -EAFNOSUPPORT; | |
1235 | } | |
1236 | dst = NULL; | |
1237 | goto do_append_data; | |
1238 | } | |
1239 | release_sock(sk); | |
1240 | } | |
1241 | ulen += sizeof(struct udphdr); | |
1242 | ||
4c9483b2 | 1243 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1244 | |
1245 | if (sin6) { | |
1246 | if (sin6->sin6_port == 0) | |
1247 | return -EINVAL; | |
1248 | ||
1958b856 | 1249 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1250 | daddr = &sin6->sin6_addr; |
1251 | ||
1252 | if (np->sndflow) { | |
4c9483b2 DM |
1253 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1254 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1255 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1256 | if (!flowlabel) |
1da177e4 | 1257 | return -EINVAL; |
1da177e4 LT |
1258 | } |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Otherwise it will be difficult to maintain | |
1263 | * sk->sk_dst_cache. | |
1264 | */ | |
1265 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1266 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1267 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1268 | |
1269 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1270 | sin6->sin6_scope_id && | |
842df073 | 1271 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1272 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1273 | } else { |
1274 | if (sk->sk_state != TCP_ESTABLISHED) | |
1275 | return -EDESTADDRREQ; | |
1276 | ||
1958b856 | 1277 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1278 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1279 | fl6.flowlabel = np->flow_label; |
987905de | 1280 | connected = 1; |
1da177e4 LT |
1281 | } |
1282 | ||
4c9483b2 DM |
1283 | if (!fl6.flowi6_oif) |
1284 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1285 | |
4c9483b2 DM |
1286 | if (!fl6.flowi6_oif) |
1287 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1288 | |
4c9483b2 | 1289 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1290 | |
1da177e4 LT |
1291 | if (msg->msg_controllen) { |
1292 | opt = &opt_space; | |
1293 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1294 | opt->tot_len = sizeof(*opt); | |
1295 | ||
73df66f8 TP |
1296 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1297 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1298 | if (err < 0) { |
1299 | fl6_sock_release(flowlabel); | |
1300 | return err; | |
1301 | } | |
4c9483b2 DM |
1302 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1303 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1304 | if (!flowlabel) |
1da177e4 LT |
1305 | return -EINVAL; |
1306 | } | |
1307 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1308 | opt = NULL; | |
987905de | 1309 | connected = 0; |
1da177e4 | 1310 | } |
45f6fad8 ED |
1311 | if (!opt) { |
1312 | opt = txopt_get(np); | |
1313 | opt_to_free = opt; | |
1314 | } | |
df9890c3 YH |
1315 | if (flowlabel) |
1316 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1317 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1318 | |
4c9483b2 | 1319 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1320 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1321 | fl6.daddr = *daddr; |
876c7f41 | 1322 | else |
4c9483b2 DM |
1323 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1324 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1325 | fl6.saddr = np->saddr; |
1958b856 | 1326 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1327 | |
4c9483b2 | 1328 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1329 | if (final_p) |
987905de | 1330 | connected = 0; |
1da177e4 | 1331 | |
4c9483b2 DM |
1332 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1333 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1334 | connected = 0; |
c4062dfc EH |
1335 | } else if (!fl6.flowi6_oif) |
1336 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1337 | |
4c9483b2 | 1338 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1339 | |
0e0d44ab | 1340 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1341 | if (IS_ERR(dst)) { |
1342 | err = PTR_ERR(dst); | |
1343 | dst = NULL; | |
1da177e4 | 1344 | goto out; |
14e50e57 | 1345 | } |
1da177e4 | 1346 | |
5c98631c LC |
1347 | if (hlimit < 0) |
1348 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1349 | |
e651f03a | 1350 | if (tclass < 0) |
41a1f8ea | 1351 | tclass = np->tclass; |
41a1f8ea | 1352 | |
1da177e4 LT |
1353 | if (msg->msg_flags&MSG_CONFIRM) |
1354 | goto do_confirm; | |
1355 | back_from_confirm: | |
1356 | ||
03485f2a VY |
1357 | /* Lockless fast path for the non-corking case */ |
1358 | if (!corkreq) { | |
1359 | struct sk_buff *skb; | |
1360 | ||
1361 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
1362 | sizeof(struct udphdr), hlimit, tclass, opt, | |
1363 | &fl6, (struct rt6_info *)dst, | |
1364 | msg->msg_flags, dontfrag); | |
1365 | err = PTR_ERR(skb); | |
1366 | if (!IS_ERR_OR_NULL(skb)) | |
1367 | err = udp_v6_send_skb(skb, &fl6); | |
1368 | goto release_dst; | |
1369 | } | |
1370 | ||
1da177e4 LT |
1371 | lock_sock(sk); |
1372 | if (unlikely(up->pending)) { | |
1373 | /* The socket is already corked while preparing it. */ | |
1374 | /* ... which is an evident application bug. --ANK */ | |
1375 | release_sock(sk); | |
1376 | ||
ba7a46f1 | 1377 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1378 | err = -EINVAL; |
1379 | goto out; | |
1380 | } | |
1381 | ||
1382 | up->pending = AF_INET6; | |
1383 | ||
1384 | do_append_data: | |
e36d3ff9 JP |
1385 | if (dontfrag < 0) |
1386 | dontfrag = np->dontfrag; | |
1da177e4 | 1387 | up->len += ulen; |
f69e6d13 | 1388 | err = ip6_append_data(sk, getfrag, msg, ulen, |
4c9483b2 | 1389 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
67ba4152 | 1390 | (struct rt6_info *)dst, |
13b52cd4 | 1391 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1392 | if (err) |
1393 | udp_v6_flush_pending_frames(sk); | |
1394 | else if (!corkreq) | |
4c0a6cb0 | 1395 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1396 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1397 | up->pending = 0; | |
1da177e4 | 1398 | |
03485f2a VY |
1399 | if (err > 0) |
1400 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1401 | release_sock(sk); | |
1402 | ||
1403 | release_dst: | |
a5e7c210 DM |
1404 | if (dst) { |
1405 | if (connected) { | |
1406 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1407 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1408 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1409 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1410 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1411 | &np->saddr : |
1412 | #endif | |
1413 | NULL); | |
a5e7c210 DM |
1414 | } else { |
1415 | dst_release(dst); | |
1416 | } | |
a3c96089 | 1417 | dst = NULL; |
a5e7c210 DM |
1418 | } |
1419 | ||
1da177e4 | 1420 | out: |
a3c96089 | 1421 | dst_release(dst); |
1da177e4 | 1422 | fl6_sock_release(flowlabel); |
45f6fad8 | 1423 | txopt_put(opt_to_free); |
cd562c98 | 1424 | if (!err) |
1da177e4 | 1425 | return len; |
a18135eb DM |
1426 | /* |
1427 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1428 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1429 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1430 | * things). We could add another new stat but at least for now that | |
1431 | * seems like overkill. | |
1432 | */ | |
1433 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1434 | UDP6_INC_STATS_USER(sock_net(sk), |
1435 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1436 | } |
1da177e4 LT |
1437 | return err; |
1438 | ||
1439 | do_confirm: | |
1440 | dst_confirm(dst); | |
1441 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1442 | goto back_from_confirm; | |
1443 | err = 0; | |
1444 | goto out; | |
1445 | } | |
1446 | ||
7d06b2e0 | 1447 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1448 | { |
44046a59 | 1449 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1450 | lock_sock(sk); |
1451 | udp_v6_flush_pending_frames(sk); | |
1452 | release_sock(sk); | |
1453 | ||
44046a59 TP |
1454 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1455 | void (*encap_destroy)(struct sock *sk); | |
1456 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1457 | if (encap_destroy) | |
1458 | encap_destroy(sk); | |
1459 | } | |
1460 | ||
1da177e4 | 1461 | inet6_destroy_sock(sk); |
1da177e4 LT |
1462 | } |
1463 | ||
1464 | /* | |
1465 | * Socket option code for UDP | |
1466 | */ | |
ba4e58ec | 1467 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1468 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1469 | { |
db8dac20 | 1470 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1471 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1472 | udp_v6_push_pending_frames); | |
ba4e58ec | 1473 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1474 | } |
1475 | ||
1476 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1477 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1478 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1479 | { |
db8dac20 | 1480 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1481 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1482 | udp_v6_push_pending_frames); | |
ba4e58ec | 1483 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1484 | } |
1485 | #endif | |
1486 | ||
ba4e58ec GR |
1487 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1488 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1489 | { |
db8dac20 | 1490 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1491 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1492 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1493 | } |
1494 | ||
1495 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1496 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1497 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1498 | { |
db8dac20 | 1499 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1500 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1501 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1502 | } |
1503 | #endif | |
1504 | ||
41135cc8 | 1505 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1506 | .handler = udpv6_rcv, |
1507 | .err_handler = udpv6_err, | |
1508 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1509 | }; | |
1510 | ||
1511 | /* ------------------------------------------------------------------------ */ | |
1512 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1513 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1514 | { |
17ef66af LC |
1515 | if (v == SEQ_START_TOKEN) { |
1516 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1517 | } else { | |
1518 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1519 | struct inet_sock *inet = inet_sk(v); | |
1520 | __u16 srcp = ntohs(inet->inet_sport); | |
1521 | __u16 destp = ntohs(inet->inet_dport); | |
1522 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1523 | } | |
1da177e4 LT |
1524 | return 0; |
1525 | } | |
1526 | ||
73cb88ec AV |
1527 | static const struct file_operations udp6_afinfo_seq_fops = { |
1528 | .owner = THIS_MODULE, | |
1529 | .open = udp_seq_open, | |
1530 | .read = seq_read, | |
1531 | .llseek = seq_lseek, | |
1532 | .release = seq_release_net | |
1533 | }; | |
1534 | ||
1da177e4 | 1535 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1536 | .name = "udp6", |
1537 | .family = AF_INET6, | |
645ca708 | 1538 | .udp_table = &udp_table, |
73cb88ec | 1539 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1540 | .seq_ops = { |
1541 | .show = udp6_seq_show, | |
1542 | }, | |
1da177e4 LT |
1543 | }; |
1544 | ||
2c8c1e72 | 1545 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1546 | { |
0c96d8c5 | 1547 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1548 | } |
1549 | ||
ec120da6 IM |
1550 | void udp6_proc_exit(struct net *net) |
1551 | { | |
0c96d8c5 | 1552 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1553 | } |
1554 | #endif /* CONFIG_PROC_FS */ | |
1555 | ||
f77d6021 ED |
1556 | void udp_v6_clear_sk(struct sock *sk, int size) |
1557 | { | |
1558 | struct inet_sock *inet = inet_sk(sk); | |
1559 | ||
1560 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1561 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1562 | ||
1563 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1564 | memset(&inet->pinet6 + 1, 0, size); | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | /* ------------------------------------------------------------------------ */ |
1568 | ||
1569 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1570 | .name = "UDPv6", |
1571 | .owner = THIS_MODULE, | |
ba4e58ec | 1572 | .close = udp_lib_close, |
543d9cfe ACM |
1573 | .connect = ip6_datagram_connect, |
1574 | .disconnect = udp_disconnect, | |
1575 | .ioctl = udp_ioctl, | |
1576 | .destroy = udpv6_destroy_sock, | |
1577 | .setsockopt = udpv6_setsockopt, | |
1578 | .getsockopt = udpv6_getsockopt, | |
1579 | .sendmsg = udpv6_sendmsg, | |
1580 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1581 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1582 | .hash = udp_lib_hash, |
1583 | .unhash = udp_lib_unhash, | |
719f8358 | 1584 | .rehash = udp_v6_rehash, |
543d9cfe | 1585 | .get_port = udp_v6_get_port, |
95766fff HA |
1586 | .memory_allocated = &udp_memory_allocated, |
1587 | .sysctl_mem = sysctl_udp_mem, | |
1588 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1589 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1590 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1591 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1592 | .h.udp_table = &udp_table, |
3fdadf7d | 1593 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1594 | .compat_setsockopt = compat_udpv6_setsockopt, |
1595 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1596 | #endif |
f77d6021 | 1597 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1598 | }; |
1599 | ||
1da177e4 LT |
1600 | static struct inet_protosw udpv6_protosw = { |
1601 | .type = SOCK_DGRAM, | |
1602 | .protocol = IPPROTO_UDP, | |
1603 | .prot = &udpv6_prot, | |
1604 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1605 | .flags = INET_PROTOSW_PERMANENT, |
1606 | }; | |
1607 | ||
7f4e4868 | 1608 | int __init udpv6_init(void) |
1da177e4 | 1609 | { |
7f4e4868 DL |
1610 | int ret; |
1611 | ||
3336288a VY |
1612 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1613 | if (ret) | |
c6b641a4 | 1614 | goto out; |
3336288a | 1615 | |
7f4e4868 DL |
1616 | ret = inet6_register_protosw(&udpv6_protosw); |
1617 | if (ret) | |
1618 | goto out_udpv6_protocol; | |
1619 | out: | |
1620 | return ret; | |
1621 | ||
1622 | out_udpv6_protocol: | |
1623 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1624 | goto out; | |
1625 | } | |
1626 | ||
09f7709f | 1627 | void udpv6_exit(void) |
7f4e4868 DL |
1628 | { |
1629 | inet6_unregister_protosw(&udpv6_protosw); | |
1630 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1631 | } |