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> |
1da177e4 LT |
50 | |
51 | #include <linux/proc_fs.h> | |
52 | #include <linux/seq_file.h> | |
22911fc5 | 53 | #include <trace/events/skb.h> |
ba4e58ec | 54 | #include "udp_impl.h" |
1da177e4 | 55 | |
6eada011 ED |
56 | static u32 udp6_ehashfn(const struct net *net, |
57 | const struct in6_addr *laddr, | |
58 | const u16 lport, | |
59 | const struct in6_addr *faddr, | |
60 | const __be16 fport) | |
b50026b5 | 61 | { |
1bbdceef HFS |
62 | static u32 udp6_ehash_secret __read_mostly; |
63 | static u32 udp_ipv6_hash_secret __read_mostly; | |
64 | ||
65 | u32 lhash, fhash; | |
66 | ||
67 | net_get_random_once(&udp6_ehash_secret, | |
68 | sizeof(udp6_ehash_secret)); | |
69 | net_get_random_once(&udp_ipv6_hash_secret, | |
70 | sizeof(udp_ipv6_hash_secret)); | |
71 | ||
72 | lhash = (__force u32)laddr->s6_addr32[3]; | |
73 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
74 | ||
b50026b5 | 75 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 76 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
77 | } |
78 | ||
b2f5e7cd VY |
79 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
80 | { | |
b2f5e7cd | 81 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); |
b2f5e7cd | 82 | int sk2_ipv6only = inet_v6_ipv6only(sk2); |
efe4208f | 83 | int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); |
b2f5e7cd VY |
84 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
85 | ||
86 | /* if both are mapped, treat as IPv4 */ | |
87 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 | 88 | return (!sk2_ipv6only && |
50805466 ED |
89 | (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr || |
90 | sk->sk_rcv_saddr == sk2->sk_rcv_saddr)); | |
b2f5e7cd VY |
91 | |
92 | if (addr_type2 == IPV6_ADDR_ANY && | |
93 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
94 | return 1; | |
95 | ||
96 | if (addr_type == IPV6_ADDR_ANY && | |
9fe516ba | 97 | !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED)) |
b2f5e7cd VY |
98 | return 1; |
99 | ||
100 | if (sk2_rcv_saddr6 && | |
efe4208f | 101 | ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) |
b2f5e7cd VY |
102 | return 1; |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
6eada011 ED |
107 | static u32 udp6_portaddr_hash(const struct net *net, |
108 | const struct in6_addr *addr6, | |
109 | unsigned int port) | |
d4cada4a ED |
110 | { |
111 | unsigned int hash, mix = net_hash_mix(net); | |
112 | ||
113 | if (ipv6_addr_any(addr6)) | |
114 | hash = jhash_1word(0, mix); | |
856540ee | 115 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 116 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 117 | else |
0eae88f3 | 118 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
119 | |
120 | return hash ^ port; | |
121 | } | |
122 | ||
6ba5a3c5 | 123 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 124 | { |
30fff923 ED |
125 | unsigned int hash2_nulladdr = |
126 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 127 | unsigned int hash2_partial = |
efe4208f | 128 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 129 | |
d4cada4a | 130 | /* precompute partial secondary hash */ |
30fff923 ED |
131 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
132 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
133 | } |
134 | ||
719f8358 ED |
135 | static void udp_v6_rehash(struct sock *sk) |
136 | { | |
137 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 138 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
139 | inet_sk(sk)->inet_num); |
140 | ||
141 | udp_lib_rehash(sk, new_hash); | |
142 | } | |
143 | ||
645ca708 ED |
144 | static inline int compute_score(struct sock *sk, struct net *net, |
145 | unsigned short hnum, | |
88440ae7 BS |
146 | const struct in6_addr *saddr, __be16 sport, |
147 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
148 | int dif) |
149 | { | |
60c04aec JP |
150 | int score; |
151 | struct inet_sock *inet; | |
152 | ||
153 | if (!net_eq(sock_net(sk), net) || | |
154 | udp_sk(sk)->udp_port_hash != hnum || | |
155 | sk->sk_family != PF_INET6) | |
156 | return -1; | |
157 | ||
158 | score = 0; | |
159 | inet = inet_sk(sk); | |
160 | ||
161 | if (inet->inet_dport) { | |
162 | if (inet->inet_dport != sport) | |
163 | return -1; | |
164 | score++; | |
165 | } | |
166 | ||
167 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
168 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
169 | return -1; | |
170 | score++; | |
171 | } | |
172 | ||
173 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
174 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
175 | return -1; | |
176 | score++; | |
177 | } | |
178 | ||
179 | if (sk->sk_bound_dev_if) { | |
180 | if (sk->sk_bound_dev_if != dif) | |
181 | return -1; | |
182 | score++; | |
645ca708 | 183 | } |
60c04aec | 184 | |
70da268b ED |
185 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
186 | score++; | |
187 | ||
645ca708 ED |
188 | return score; |
189 | } | |
190 | ||
fddc17de | 191 | static inline int compute_score2(struct sock *sk, struct net *net, |
60c04aec JP |
192 | const struct in6_addr *saddr, __be16 sport, |
193 | const struct in6_addr *daddr, | |
194 | unsigned short hnum, int dif) | |
fddc17de | 195 | { |
60c04aec JP |
196 | int score; |
197 | struct inet_sock *inet; | |
fddc17de | 198 | |
60c04aec JP |
199 | if (!net_eq(sock_net(sk), net) || |
200 | udp_sk(sk)->udp_port_hash != hnum || | |
201 | sk->sk_family != PF_INET6) | |
202 | return -1; | |
fddc17de | 203 | |
60c04aec JP |
204 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
205 | return -1; | |
206 | ||
207 | score = 0; | |
208 | inet = inet_sk(sk); | |
209 | ||
210 | if (inet->inet_dport) { | |
211 | if (inet->inet_dport != sport) | |
212 | return -1; | |
213 | score++; | |
214 | } | |
215 | ||
216 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
217 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de | 218 | return -1; |
60c04aec | 219 | score++; |
fddc17de | 220 | } |
60c04aec JP |
221 | |
222 | if (sk->sk_bound_dev_if) { | |
223 | if (sk->sk_bound_dev_if != dif) | |
224 | return -1; | |
225 | score++; | |
226 | } | |
227 | ||
70da268b ED |
228 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
229 | score++; | |
230 | ||
fddc17de ED |
231 | return score; |
232 | } | |
233 | ||
fddc17de ED |
234 | /* called with read_rcu_lock() */ |
235 | static struct sock *udp6_lib_lookup2(struct net *net, | |
236 | const struct in6_addr *saddr, __be16 sport, | |
237 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
238 | struct udp_hslot *hslot2, unsigned int slot2) | |
239 | { | |
240 | struct sock *sk, *result; | |
241 | struct hlist_nulls_node *node; | |
72289b96 TH |
242 | int score, badness, matches = 0, reuseport = 0; |
243 | u32 hash = 0; | |
fddc17de ED |
244 | |
245 | begin: | |
246 | result = NULL; | |
247 | badness = -1; | |
248 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
249 | score = compute_score2(sk, net, saddr, sport, | |
250 | daddr, hnum, dif); | |
251 | if (score > badness) { | |
252 | result = sk; | |
253 | badness = score; | |
72289b96 TH |
254 | reuseport = sk->sk_reuseport; |
255 | if (reuseport) { | |
b50026b5 HFS |
256 | hash = udp6_ehashfn(net, daddr, hnum, |
257 | saddr, sport); | |
72289b96 | 258 | matches = 1; |
70da268b | 259 | } |
72289b96 TH |
260 | } else if (score == badness && reuseport) { |
261 | matches++; | |
8fc54f68 | 262 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
263 | result = sk; |
264 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
265 | } |
266 | } | |
267 | /* | |
268 | * if the nulls value we got at the end of this lookup is | |
269 | * not the expected one, we must restart lookup. | |
270 | * We probably met an item that was moved to another chain. | |
271 | */ | |
272 | if (get_nulls_value(node) != slot2) | |
273 | goto begin; | |
274 | ||
275 | if (result) { | |
c31504dc | 276 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
277 | result = NULL; |
278 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
279 | daddr, hnum, dif) < badness)) { | |
280 | sock_put(result); | |
281 | goto begin; | |
282 | } | |
283 | } | |
284 | return result; | |
285 | } | |
286 | ||
fce82338 | 287 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
288 | const struct in6_addr *saddr, __be16 sport, |
289 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 | 290 | int dif, struct udp_table *udptable) |
1da177e4 | 291 | { |
271b72c7 | 292 | struct sock *sk, *result; |
88ab1932 | 293 | struct hlist_nulls_node *node; |
1da177e4 | 294 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
295 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
296 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 TH |
297 | int score, badness, matches = 0, reuseport = 0; |
298 | u32 hash = 0; | |
645ca708 | 299 | |
271b72c7 | 300 | rcu_read_lock(); |
fddc17de ED |
301 | if (hslot->count > 10) { |
302 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
303 | slot2 = hash2 & udptable->mask; | |
304 | hslot2 = &udptable->hash2[slot2]; | |
305 | if (hslot->count < hslot2->count) | |
306 | goto begin; | |
307 | ||
308 | result = udp6_lib_lookup2(net, saddr, sport, | |
309 | daddr, hnum, dif, | |
310 | hslot2, slot2); | |
311 | if (!result) { | |
312 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
313 | slot2 = hash2 & udptable->mask; | |
314 | hslot2 = &udptable->hash2[slot2]; | |
315 | if (hslot->count < hslot2->count) | |
316 | goto begin; | |
317 | ||
1223c67c JBD |
318 | result = udp6_lib_lookup2(net, saddr, sport, |
319 | &in6addr_any, hnum, dif, | |
fddc17de ED |
320 | hslot2, slot2); |
321 | } | |
322 | rcu_read_unlock(); | |
323 | return result; | |
324 | } | |
271b72c7 ED |
325 | begin: |
326 | result = NULL; | |
327 | badness = -1; | |
88ab1932 | 328 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
329 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
330 | if (score > badness) { | |
331 | result = sk; | |
332 | badness = score; | |
72289b96 TH |
333 | reuseport = sk->sk_reuseport; |
334 | if (reuseport) { | |
b50026b5 HFS |
335 | hash = udp6_ehashfn(net, daddr, hnum, |
336 | saddr, sport); | |
72289b96 TH |
337 | matches = 1; |
338 | } | |
339 | } else if (score == badness && reuseport) { | |
340 | matches++; | |
8fc54f68 | 341 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
342 | result = sk; |
343 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
344 | } |
345 | } | |
88ab1932 ED |
346 | /* |
347 | * if the nulls value we got at the end of this lookup is | |
348 | * not the expected one, we must restart lookup. | |
349 | * We probably met an item that was moved to another chain. | |
350 | */ | |
fddc17de | 351 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
352 | goto begin; |
353 | ||
271b72c7 | 354 | if (result) { |
c31504dc | 355 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
356 | result = NULL; |
357 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
358 | daddr, dport, dif) < badness)) { | |
359 | sock_put(result); | |
360 | goto begin; | |
361 | } | |
362 | } | |
363 | rcu_read_unlock(); | |
1da177e4 LT |
364 | return result; |
365 | } | |
fce82338 | 366 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 367 | |
607c4aaf KK |
368 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
369 | __be16 sport, __be16 dport, | |
645ca708 | 370 | struct udp_table *udptable) |
607c4aaf | 371 | { |
23542618 | 372 | struct sock *sk; |
b71d1d42 | 373 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 374 | |
e5d08d71 IM |
375 | sk = skb_steal_sock(skb); |
376 | if (unlikely(sk)) | |
23542618 | 377 | return sk; |
adf30907 ED |
378 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
379 | &iph->daddr, dport, inet6_iif(skb), | |
380 | udptable); | |
607c4aaf KK |
381 | } |
382 | ||
aa976fc0 BS |
383 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
384 | const struct in6_addr *daddr, __be16 dport, int dif) | |
385 | { | |
386 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
389 | ||
1da177e4 | 390 | /* |
67ba4152 IM |
391 | * This should be easy, if there is something there we |
392 | * return it, otherwise we block. | |
1da177e4 LT |
393 | */ |
394 | ||
1b784140 | 395 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
396 | int noblock, int flags, int *addr_len) |
397 | { | |
398 | struct ipv6_pinfo *np = inet6_sk(sk); | |
399 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 400 | struct sk_buff *skb; |
59c2cdae | 401 | unsigned int ulen, copied; |
3f518bf7 | 402 | int peeked, off = 0; |
759e5d00 HX |
403 | int err; |
404 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 405 | int is_udp4; |
8a74ad60 | 406 | bool slow; |
1da177e4 | 407 | |
1da177e4 | 408 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 409 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 410 | |
4b340ae2 | 411 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 412 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 413 | |
1da177e4 | 414 | try_again: |
a59322be | 415 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 416 | &peeked, &off, &err); |
1da177e4 LT |
417 | if (!skb) |
418 | goto out; | |
419 | ||
759e5d00 | 420 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
421 | copied = len; |
422 | if (copied > ulen) | |
423 | copied = ulen; | |
424 | else if (copied < ulen) | |
1ab1457c | 425 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 426 | |
f26ba175 WY |
427 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
428 | ||
ba4e58ec | 429 | /* |
759e5d00 HX |
430 | * If checksum is needed at all, try to do it while copying the |
431 | * data. If the data is truncated, or if we only want a partial | |
432 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 433 | */ |
ba4e58ec | 434 | |
59c2cdae | 435 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
759e5d00 | 436 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 437 | goto csum_copy_err; |
ba4e58ec GR |
438 | } |
439 | ||
60476372 | 440 | if (skb_csum_unnecessary(skb)) |
51f3d02b DM |
441 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
442 | msg, copied); | |
ba4e58ec | 443 | else { |
227158db | 444 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); |
1da177e4 LT |
445 | if (err == -EINVAL) |
446 | goto csum_copy_err; | |
447 | } | |
22911fc5 ED |
448 | if (unlikely(err)) { |
449 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
450 | if (!peeked) { |
451 | atomic_inc(&sk->sk_drops); | |
452 | if (is_udp4) | |
453 | UDP_INC_STATS_USER(sock_net(sk), | |
454 | UDP_MIB_INERRORS, | |
455 | is_udplite); | |
456 | else | |
457 | UDP6_INC_STATS_USER(sock_net(sk), | |
458 | UDP_MIB_INERRORS, | |
459 | is_udplite); | |
460 | } | |
1da177e4 | 461 | goto out_free; |
22911fc5 | 462 | } |
f26ba175 WY |
463 | if (!peeked) { |
464 | if (is_udp4) | |
465 | UDP_INC_STATS_USER(sock_net(sk), | |
466 | UDP_MIB_INDATAGRAMS, is_udplite); | |
467 | else | |
468 | UDP6_INC_STATS_USER(sock_net(sk), | |
469 | UDP_MIB_INDATAGRAMS, is_udplite); | |
470 | } | |
cb75994e | 471 | |
3b885787 | 472 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
473 | |
474 | /* Copy the address. */ | |
475 | if (msg->msg_name) { | |
342dfc30 | 476 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 477 | sin6->sin6_family = AF_INET6; |
4bedb452 | 478 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 479 | sin6->sin6_flowinfo = 0; |
1da177e4 | 480 | |
842df073 | 481 | if (is_udp4) { |
b301e82c BH |
482 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
483 | &sin6->sin6_addr); | |
842df073 HFS |
484 | sin6->sin6_scope_id = 0; |
485 | } else { | |
4e3fd7a0 | 486 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
487 | sin6->sin6_scope_id = |
488 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 489 | inet6_iif(skb)); |
1da177e4 | 490 | } |
bceaa902 | 491 | *addr_len = sizeof(*sin6); |
1da177e4 | 492 | } |
4b261c75 HFS |
493 | |
494 | if (np->rxopt.all) | |
495 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
496 | ||
f26ba175 | 497 | if (is_udp4) { |
1da177e4 LT |
498 | if (inet->cmsg_flags) |
499 | ip_cmsg_recv(msg, skb); | |
500 | } else { | |
501 | if (np->rxopt.all) | |
4b261c75 | 502 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 503 | } |
1da177e4 | 504 | |
59c2cdae | 505 | err = copied; |
1da177e4 | 506 | if (flags & MSG_TRUNC) |
759e5d00 | 507 | err = ulen; |
1da177e4 LT |
508 | |
509 | out_free: | |
9d410c79 | 510 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
511 | out: |
512 | return err; | |
513 | ||
514 | csum_copy_err: | |
8a74ad60 | 515 | slow = lock_sock_fast(sk); |
0856f939 | 516 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
517 | if (is_udp4) { |
518 | UDP_INC_STATS_USER(sock_net(sk), | |
519 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
520 | UDP_INC_STATS_USER(sock_net(sk), |
521 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
522 | } else { |
523 | UDP6_INC_STATS_USER(sock_net(sk), | |
524 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
525 | UDP6_INC_STATS_USER(sock_net(sk), |
526 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 527 | } |
0856f939 | 528 | } |
8a74ad60 | 529 | unlock_sock_fast(sk, slow); |
1da177e4 | 530 | |
beb39db5 ED |
531 | /* starting over for a new packet, but check if we need to yield */ |
532 | cond_resched(); | |
9cfaa8de | 533 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
534 | goto try_again; |
535 | } | |
536 | ||
ba4e58ec | 537 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 538 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 539 | struct udp_table *udptable) |
1da177e4 LT |
540 | { |
541 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
542 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
543 | const struct in6_addr *saddr = &hdr->saddr; | |
544 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 545 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 LT |
546 | struct sock *sk; |
547 | int err; | |
7304fe46 | 548 | struct net *net = dev_net(skb->dev); |
1da177e4 | 549 | |
7304fe46 | 550 | sk = __udp6_lib_lookup(net, daddr, uh->dest, |
ba4e58ec | 551 | saddr, uh->source, inet6_iif(skb), udptable); |
63159f29 | 552 | if (!sk) { |
7304fe46 DJ |
553 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
554 | ICMP6_MIB_INERRORS); | |
1da177e4 | 555 | return; |
7304fe46 | 556 | } |
1da177e4 | 557 | |
93b36cf3 HFS |
558 | if (type == ICMPV6_PKT_TOOBIG) { |
559 | if (!ip6_sk_accept_pmtu(sk)) | |
560 | goto out; | |
81aded24 | 561 | ip6_sk_update_pmtu(skb, sk, info); |
93b36cf3 | 562 | } |
1a462d18 | 563 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 564 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
565 | goto out; |
566 | } | |
81aded24 | 567 | |
1da177e4 LT |
568 | np = inet6_sk(sk); |
569 | ||
570 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
571 | goto out; | |
572 | ||
573 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
574 | goto out; | |
575 | ||
b1faf566 | 576 | if (np->recverr) |
1da177e4 | 577 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 578 | |
1da177e4 LT |
579 | sk->sk_err = err; |
580 | sk->sk_error_report(sk); | |
581 | out: | |
582 | sock_put(sk); | |
583 | } | |
584 | ||
f7ad74fe BL |
585 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
586 | { | |
587 | int rc; | |
588 | ||
efe4208f | 589 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 590 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 591 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 592 | sk_incoming_cpu_update(sk); |
005ec974 | 593 | } |
f7ad74fe BL |
594 | |
595 | rc = sock_queue_rcv_skb(sk, skb); | |
596 | if (rc < 0) { | |
597 | int is_udplite = IS_UDPLITE(sk); | |
598 | ||
599 | /* Note that an ENOMEM error is charged twice */ | |
600 | if (rc == -ENOMEM) | |
601 | UDP6_INC_STATS_BH(sock_net(sk), | |
602 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
603 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
604 | kfree_skb(skb); | |
605 | return -1; | |
606 | } | |
607 | return 0; | |
608 | } | |
609 | ||
ba4e58ec | 610 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 611 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 612 | u8 code, int offset, __be32 info) |
ba4e58ec | 613 | { |
645ca708 | 614 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
615 | } |
616 | ||
d7f3f621 BL |
617 | static struct static_key udpv6_encap_needed __read_mostly; |
618 | void udpv6_encap_enable(void) | |
619 | { | |
620 | if (!static_key_enabled(&udpv6_encap_needed)) | |
621 | static_key_slow_inc(&udpv6_encap_needed); | |
622 | } | |
623 | EXPORT_SYMBOL(udpv6_encap_enable); | |
624 | ||
f7ad74fe | 625 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 626 | { |
ba4e58ec | 627 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 628 | int rc; |
b2bf1e26 | 629 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 630 | |
ba4e58ec GR |
631 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
632 | goto drop; | |
1da177e4 | 633 | |
d7f3f621 BL |
634 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
635 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
636 | ||
637 | /* | |
638 | * This is an encapsulation socket so pass the skb to | |
639 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
640 | * fall through and pass this up the UDP socket. | |
641 | * up->encap_rcv() returns the following value: | |
642 | * =0 if skb was successfully passed to the encap | |
643 | * handler or was discarded by it. | |
644 | * >0 if skb should be passed on to UDP. | |
645 | * <0 if skb should be resubmitted as proto -N | |
646 | */ | |
647 | ||
648 | /* if we're overly short, let UDP handle it */ | |
649 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 650 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
651 | int ret; |
652 | ||
0a80966b TH |
653 | /* Verify checksum before giving to encap */ |
654 | if (udp_lib_checksum_complete(skb)) | |
655 | goto csum_error; | |
656 | ||
d7f3f621 BL |
657 | ret = encap_rcv(sk, skb); |
658 | if (ret <= 0) { | |
659 | UDP_INC_STATS_BH(sock_net(sk), | |
660 | UDP_MIB_INDATAGRAMS, | |
661 | is_udplite); | |
662 | return -ret; | |
663 | } | |
664 | } | |
665 | ||
666 | /* FALLTHROUGH -- it's a UDP Packet */ | |
667 | } | |
668 | ||
ba4e58ec GR |
669 | /* |
670 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
671 | */ | |
b2bf1e26 | 672 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
673 | |
674 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
675 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
676 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
677 | goto drop; |
678 | } | |
679 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
680 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
681 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
682 | goto drop; |
683 | } | |
1da177e4 LT |
684 | } |
685 | ||
33d480ce | 686 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 687 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 688 | goto csum_error; |
1ab6eb62 | 689 | } |
ba4e58ec | 690 | |
274f482d | 691 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
3e215c8d JL |
692 | UDP6_INC_STATS_BH(sock_net(sk), |
693 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 694 | goto drop; |
3e215c8d | 695 | } |
cb80ef46 | 696 | |
d826eb14 | 697 | skb_dst_drop(skb); |
cb75994e | 698 | |
cb80ef46 BL |
699 | bh_lock_sock(sk); |
700 | rc = 0; | |
701 | if (!sock_owned_by_user(sk)) | |
702 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
703 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
704 | bh_unlock_sock(sk); | |
705 | goto drop; | |
706 | } | |
707 | bh_unlock_sock(sk); | |
f7ad74fe BL |
708 | |
709 | return rc; | |
3e215c8d | 710 | |
6a5dc9e5 ED |
711 | csum_error: |
712 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 713 | drop: |
ef28d1a2 | 714 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 715 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
716 | kfree_skb(skb); |
717 | return -1; | |
1da177e4 LT |
718 | } |
719 | ||
5cf3d461 DH |
720 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
721 | __be16 loc_port, const struct in6_addr *loc_addr, | |
722 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
723 | int dif, unsigned short hnum) | |
1da177e4 | 724 | { |
5cf3d461 | 725 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 726 | |
5cf3d461 DH |
727 | if (!net_eq(sock_net(sk), net)) |
728 | return false; | |
729 | ||
730 | if (udp_sk(sk)->udp_port_hash != hnum || | |
731 | sk->sk_family != PF_INET6 || | |
732 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
733 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
734 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
735 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
736 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
737 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
738 | return false; |
739 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
740 | return false; | |
741 | return true; | |
1da177e4 LT |
742 | } |
743 | ||
a1ab77f9 ED |
744 | static void flush_stack(struct sock **stack, unsigned int count, |
745 | struct sk_buff *skb, unsigned int final) | |
746 | { | |
cb80ef46 | 747 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 748 | struct sock *sk; |
cb80ef46 | 749 | unsigned int i; |
a1ab77f9 ED |
750 | |
751 | for (i = 0; i < count; i++) { | |
f6b8f32c | 752 | sk = stack[i]; |
63159f29 | 753 | if (likely(!skb1)) |
cb80ef46 BL |
754 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
755 | if (!skb1) { | |
756 | atomic_inc(&sk->sk_drops); | |
757 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
758 | IS_UDPLITE(sk)); | |
759 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
760 | IS_UDPLITE(sk)); | |
a1ab77f9 | 761 | } |
cb80ef46 BL |
762 | |
763 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
764 | skb1 = NULL; | |
2dc41cff | 765 | sock_put(sk); |
a1ab77f9 | 766 | } |
cb80ef46 BL |
767 | if (unlikely(skb1)) |
768 | kfree_skb(skb1); | |
a1ab77f9 | 769 | } |
4068579e TH |
770 | |
771 | static void udp6_csum_zero_error(struct sk_buff *skb) | |
772 | { | |
773 | /* RFC 2460 section 8.1 says that we SHOULD log | |
774 | * this error. Well, it is reasonable. | |
775 | */ | |
ba7a46f1 JP |
776 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
777 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
778 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
779 | } |
780 | ||
1da177e4 LT |
781 | /* |
782 | * Note: called only from the BH handler context, | |
783 | * so we don't need to lock the hashes. | |
784 | */ | |
e3163493 | 785 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 786 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 787 | struct udp_table *udptable, int proto) |
1da177e4 | 788 | { |
a1ab77f9 | 789 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 790 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
791 | struct hlist_nulls_node *node; |
792 | unsigned short hnum = ntohs(uh->dest); | |
793 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
794 | int dif = inet6_iif(skb); | |
2dc41cff DH |
795 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
796 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); | |
36cbb245 | 797 | bool inner_flushed = false; |
2dc41cff DH |
798 | |
799 | if (use_hash2) { | |
800 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
801 | udp_table.mask; | |
802 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
803 | start_lookup: | |
804 | hslot = &udp_table.hash2[hash2]; | |
805 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
806 | } | |
1da177e4 | 807 | |
645ca708 | 808 | spin_lock(&hslot->lock); |
2dc41cff | 809 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
5cf3d461 DH |
810 | if (__udp_v6_is_mcast_sock(net, sk, |
811 | uh->dest, daddr, | |
812 | uh->source, saddr, | |
813 | dif, hnum) && | |
814 | /* If zero checksum and no_check is not on for | |
815 | * the socket then skip it. | |
816 | */ | |
817 | (uh->check || udp_sk(sk)->no_check6_rx)) { | |
818 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
819 | flush_stack(stack, count, skb, ~0); | |
36cbb245 | 820 | inner_flushed = true; |
5cf3d461 DH |
821 | count = 0; |
822 | } | |
4068579e | 823 | stack[count++] = sk; |
2dc41cff | 824 | sock_hold(sk); |
95766fff | 825 | } |
1da177e4 | 826 | } |
a1ab77f9 | 827 | |
645ca708 | 828 | spin_unlock(&hslot->lock); |
a1ab77f9 | 829 | |
2dc41cff DH |
830 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
831 | if (use_hash2 && hash2 != hash2_any) { | |
832 | hash2 = hash2_any; | |
833 | goto start_lookup; | |
834 | } | |
835 | ||
a1ab77f9 ED |
836 | if (count) { |
837 | flush_stack(stack, count, skb, count - 1); | |
a1ab77f9 | 838 | } else { |
36cbb245 RJ |
839 | if (!inner_flushed) |
840 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, | |
841 | proto == IPPROTO_UDPLITE); | |
842 | consume_skb(skb); | |
a1ab77f9 | 843 | } |
ba4e58ec | 844 | return 0; |
1da177e4 LT |
845 | } |
846 | ||
645ca708 | 847 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 848 | int proto) |
1da177e4 | 849 | { |
3ffe533c | 850 | struct net *net = dev_net(skb->dev); |
1da177e4 | 851 | struct sock *sk; |
1ab1457c | 852 | struct udphdr *uh; |
b71d1d42 | 853 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
854 | u32 ulen = 0; |
855 | ||
856 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 857 | goto discard; |
1da177e4 | 858 | |
0660e03f ACM |
859 | saddr = &ipv6_hdr(skb)->saddr; |
860 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 861 | uh = udp_hdr(skb); |
1da177e4 LT |
862 | |
863 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
864 | if (ulen > skb->len) |
865 | goto short_packet; | |
1da177e4 | 866 | |
759e5d00 HX |
867 | if (proto == IPPROTO_UDP) { |
868 | /* UDP validates ulen. */ | |
1da177e4 | 869 | |
ba4e58ec GR |
870 | /* Check for jumbo payload */ |
871 | if (ulen == 0) | |
872 | ulen = skb->len; | |
1da177e4 | 873 | |
ba4e58ec GR |
874 | if (ulen < sizeof(*uh)) |
875 | goto short_packet; | |
1da177e4 | 876 | |
ba4e58ec GR |
877 | if (ulen < skb->len) { |
878 | if (pskb_trim_rcsum(skb, ulen)) | |
879 | goto short_packet; | |
0660e03f ACM |
880 | saddr = &ipv6_hdr(skb)->saddr; |
881 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 882 | uh = udp_hdr(skb); |
ba4e58ec | 883 | } |
ba4e58ec | 884 | } |
1da177e4 | 885 | |
759e5d00 | 886 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 887 | goto csum_error; |
759e5d00 | 888 | |
1ab1457c YH |
889 | /* |
890 | * Multicast receive code | |
1da177e4 | 891 | */ |
ba4e58ec | 892 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 893 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 894 | saddr, daddr, udptable, proto); |
1da177e4 LT |
895 | |
896 | /* Unicast */ | |
897 | ||
1ab1457c | 898 | /* |
1da177e4 LT |
899 | * check socket cache ... must talk to Alan about his plans |
900 | * for sock caches... i'll skip this for now. | |
901 | */ | |
607c4aaf | 902 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 903 | if (sk) { |
a5b50476 ET |
904 | int ret; |
905 | ||
1c19448c | 906 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
79e0f1c9 | 907 | sock_put(sk); |
4068579e TH |
908 | udp6_csum_zero_error(skb); |
909 | goto csum_error; | |
910 | } | |
911 | ||
224d019c | 912 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
913 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
914 | ip6_compute_pseudo); | |
915 | ||
a5b50476 | 916 | ret = udpv6_queue_rcv_skb(sk, skb); |
cb80ef46 | 917 | sock_put(sk); |
1da177e4 | 918 | |
cb80ef46 BL |
919 | /* a return value > 0 means to resubmit the input, but |
920 | * it wants the return to be -protocol, or 0 | |
921 | */ | |
922 | if (ret > 0) | |
923 | return -ret; | |
1da177e4 | 924 | |
add459aa | 925 | return 0; |
1da177e4 | 926 | } |
1ab1457c | 927 | |
4068579e TH |
928 | if (!uh->check) { |
929 | udp6_csum_zero_error(skb); | |
930 | goto csum_error; | |
931 | } | |
932 | ||
cb80ef46 | 933 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 934 | goto discard; |
cb80ef46 BL |
935 | |
936 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 937 | goto csum_error; |
cb80ef46 BL |
938 | |
939 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
940 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
941 | ||
942 | kfree_skb(skb); | |
add459aa | 943 | return 0; |
1da177e4 | 944 | |
1ab1457c | 945 | short_packet: |
ba7a46f1 JP |
946 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
947 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
948 | saddr, ntohs(uh->source), | |
949 | ulen, skb->len, | |
950 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
951 | goto discard; |
952 | csum_error: | |
953 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 954 | discard: |
ef28d1a2 | 955 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 956 | kfree_skb(skb); |
add459aa | 957 | return 0; |
1da177e4 | 958 | } |
ba4e58ec | 959 | |
e5bbef20 | 960 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 961 | { |
645ca708 | 962 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
963 | } |
964 | ||
1da177e4 LT |
965 | /* |
966 | * Throw away all pending data and cancel the corking. Socket is locked. | |
967 | */ | |
968 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
969 | { | |
970 | struct udp_sock *up = udp_sk(sk); | |
971 | ||
36d926b9 DL |
972 | if (up->pending == AF_INET) |
973 | udp_flush_pending_frames(sk); | |
974 | else if (up->pending) { | |
1da177e4 LT |
975 | up->len = 0; |
976 | up->pending = 0; | |
977 | ip6_flush_pending_frames(sk); | |
1ab1457c | 978 | } |
1da177e4 LT |
979 | } |
980 | ||
493c6be3 | 981 | /** |
67ba4152 IM |
982 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
983 | * @sk: socket we are sending on | |
984 | * @skb: sk_buff containing the filled-in UDP header | |
985 | * (checksum field must be zeroed out) | |
493c6be3 SS |
986 | */ |
987 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
988 | const struct in6_addr *saddr, | |
989 | const struct in6_addr *daddr, int len) | |
990 | { | |
991 | unsigned int offset; | |
992 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 993 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
994 | __wsum csum = 0; |
995 | ||
d39d938c | 996 | if (!frags) { |
493c6be3 SS |
997 | /* Only one fragment on the socket. */ |
998 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
999 | skb->csum_offset = offsetof(struct udphdr, check); | |
1000 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1001 | } else { | |
1002 | /* | |
1003 | * HW-checksum won't work as there are two or more | |
1004 | * fragments on the socket so that all csums of sk_buffs | |
1005 | * should be together | |
1006 | */ | |
1007 | offset = skb_transport_offset(skb); | |
1008 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1009 | ||
1010 | skb->ip_summed = CHECKSUM_NONE; | |
1011 | ||
d39d938c VY |
1012 | do { |
1013 | csum = csum_add(csum, frags->csum); | |
1014 | } while ((frags = frags->next)); | |
493c6be3 SS |
1015 | |
1016 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1017 | csum); | |
1018 | if (uh->check == 0) | |
1019 | uh->check = CSUM_MANGLED_0; | |
1020 | } | |
1021 | } | |
1022 | ||
1da177e4 LT |
1023 | /* |
1024 | * Sending | |
1025 | */ | |
1026 | ||
d39d938c | 1027 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 1028 | { |
d39d938c | 1029 | struct sock *sk = skb->sk; |
1da177e4 | 1030 | struct udphdr *uh; |
1da177e4 | 1031 | int err = 0; |
b2bf1e26 | 1032 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1033 | __wsum csum = 0; |
d39d938c VY |
1034 | int offset = skb_transport_offset(skb); |
1035 | int len = skb->len - offset; | |
1da177e4 LT |
1036 | |
1037 | /* | |
1038 | * Create a UDP header | |
1039 | */ | |
4bedb452 | 1040 | uh = udp_hdr(skb); |
1958b856 DM |
1041 | uh->source = fl6->fl6_sport; |
1042 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1043 | uh->len = htons(len); |
1da177e4 LT |
1044 | uh->check = 0; |
1045 | ||
b2bf1e26 | 1046 | if (is_udplite) |
d39d938c VY |
1047 | csum = udplite_csum(skb); |
1048 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1049 | skb->ip_summed = CHECKSUM_NONE; |
1050 | goto send; | |
1051 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1052 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1053 | goto send; |
1054 | } else | |
d39d938c | 1055 | csum = udp_csum(skb); |
1da177e4 | 1056 | |
ba4e58ec | 1057 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1058 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1059 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1060 | if (uh->check == 0) |
f6ab0288 | 1061 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1062 | |
493c6be3 | 1063 | send: |
d39d938c | 1064 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1065 | if (err) { |
1066 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1067 | UDP6_INC_STATS_USER(sock_net(sk), | |
1068 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1069 | err = 0; | |
1070 | } | |
1071 | } else | |
1072 | UDP6_INC_STATS_USER(sock_net(sk), | |
1073 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
d39d938c VY |
1074 | return err; |
1075 | } | |
1076 | ||
1077 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1078 | { | |
1079 | struct sk_buff *skb; | |
1080 | struct udp_sock *up = udp_sk(sk); | |
1081 | struct flowi6 fl6; | |
1082 | int err = 0; | |
1083 | ||
1084 | if (up->pending == AF_INET) | |
1085 | return udp_push_pending_frames(sk); | |
1086 | ||
1087 | /* ip6_finish_skb will release the cork, so make a copy of | |
1088 | * fl6 here. | |
1089 | */ | |
1090 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1091 | ||
1092 | skb = ip6_finish_skb(sk); | |
1093 | if (!skb) | |
1094 | goto out; | |
1095 | ||
1096 | err = udp_v6_send_skb(skb, &fl6); | |
1097 | ||
1da177e4 LT |
1098 | out: |
1099 | up->len = 0; | |
1100 | up->pending = 0; | |
1101 | return err; | |
1102 | } | |
1103 | ||
1b784140 | 1104 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1105 | { |
1106 | struct ipv6_txoptions opt_space; | |
1107 | struct udp_sock *up = udp_sk(sk); | |
1108 | struct inet_sock *inet = inet_sk(sk); | |
1109 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1110 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1111 | struct in6_addr *daddr, *final_p, final; |
1da177e4 LT |
1112 | struct ipv6_txoptions *opt = NULL; |
1113 | struct ip6_flowlabel *flowlabel = NULL; | |
4c9483b2 | 1114 | struct flowi6 fl6; |
1da177e4 LT |
1115 | struct dst_entry *dst; |
1116 | int addr_len = msg->msg_namelen; | |
1117 | int ulen = len; | |
1118 | int hlimit = -1; | |
41a1f8ea | 1119 | int tclass = -1; |
13b52cd4 | 1120 | int dontfrag = -1; |
1da177e4 LT |
1121 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1122 | int err; | |
987905de | 1123 | int connected = 0; |
b2bf1e26 | 1124 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1125 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1126 | |
1127 | /* destination address check */ | |
1128 | if (sin6) { | |
1129 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1130 | return -EINVAL; | |
1131 | ||
1132 | switch (sin6->sin6_family) { | |
1133 | case AF_INET6: | |
1134 | if (addr_len < SIN6_LEN_RFC2133) | |
1135 | return -EINVAL; | |
1136 | daddr = &sin6->sin6_addr; | |
1137 | break; | |
1138 | case AF_INET: | |
1139 | goto do_udp_sendmsg; | |
1140 | case AF_UNSPEC: | |
1141 | msg->msg_name = sin6 = NULL; | |
1142 | msg->msg_namelen = addr_len = 0; | |
1143 | daddr = NULL; | |
1144 | break; | |
1145 | default: | |
1146 | return -EINVAL; | |
1147 | } | |
1148 | } else if (!up->pending) { | |
1149 | if (sk->sk_state != TCP_ESTABLISHED) | |
1150 | return -EDESTADDRREQ; | |
efe4208f | 1151 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1152 | } else |
1da177e4 LT |
1153 | daddr = NULL; |
1154 | ||
1155 | if (daddr) { | |
e773e4fa | 1156 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1157 | struct sockaddr_in sin; |
1158 | sin.sin_family = AF_INET; | |
c720c7e8 | 1159 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1160 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1161 | msg->msg_name = &sin; | |
1162 | msg->msg_namelen = sizeof(sin); | |
1163 | do_udp_sendmsg: | |
1164 | if (__ipv6_only_sock(sk)) | |
1165 | return -ENETUNREACH; | |
1b784140 | 1166 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1167 | } |
1168 | } | |
1169 | ||
1170 | if (up->pending == AF_INET) | |
1b784140 | 1171 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1172 | |
1173 | /* Rough check on arithmetic overflow, | |
b59e139b | 1174 | better check is made in ip6_append_data(). |
1da177e4 LT |
1175 | */ |
1176 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1177 | return -EMSGSIZE; | |
1ab1457c | 1178 | |
03485f2a | 1179 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1180 | if (up->pending) { |
1181 | /* | |
1182 | * There are pending frames. | |
1183 | * The socket lock must be held while it's corked. | |
1184 | */ | |
1185 | lock_sock(sk); | |
1186 | if (likely(up->pending)) { | |
1187 | if (unlikely(up->pending != AF_INET6)) { | |
1188 | release_sock(sk); | |
1189 | return -EAFNOSUPPORT; | |
1190 | } | |
1191 | dst = NULL; | |
1192 | goto do_append_data; | |
1193 | } | |
1194 | release_sock(sk); | |
1195 | } | |
1196 | ulen += sizeof(struct udphdr); | |
1197 | ||
4c9483b2 | 1198 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1199 | |
1200 | if (sin6) { | |
1201 | if (sin6->sin6_port == 0) | |
1202 | return -EINVAL; | |
1203 | ||
1958b856 | 1204 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1205 | daddr = &sin6->sin6_addr; |
1206 | ||
1207 | if (np->sndflow) { | |
4c9483b2 DM |
1208 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1209 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1210 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1211 | if (!flowlabel) |
1da177e4 | 1212 | return -EINVAL; |
1da177e4 LT |
1213 | } |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Otherwise it will be difficult to maintain | |
1218 | * sk->sk_dst_cache. | |
1219 | */ | |
1220 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1221 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1222 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1223 | |
1224 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1225 | sin6->sin6_scope_id && | |
842df073 | 1226 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1227 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1228 | } else { |
1229 | if (sk->sk_state != TCP_ESTABLISHED) | |
1230 | return -EDESTADDRREQ; | |
1231 | ||
1958b856 | 1232 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1233 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1234 | fl6.flowlabel = np->flow_label; |
987905de | 1235 | connected = 1; |
1da177e4 LT |
1236 | } |
1237 | ||
4c9483b2 DM |
1238 | if (!fl6.flowi6_oif) |
1239 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1240 | |
4c9483b2 DM |
1241 | if (!fl6.flowi6_oif) |
1242 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1243 | |
4c9483b2 | 1244 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1245 | |
1da177e4 LT |
1246 | if (msg->msg_controllen) { |
1247 | opt = &opt_space; | |
1248 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1249 | opt->tot_len = sizeof(*opt); | |
1250 | ||
73df66f8 TP |
1251 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1252 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1253 | if (err < 0) { |
1254 | fl6_sock_release(flowlabel); | |
1255 | return err; | |
1256 | } | |
4c9483b2 DM |
1257 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1258 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1259 | if (!flowlabel) |
1da177e4 LT |
1260 | return -EINVAL; |
1261 | } | |
1262 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1263 | opt = NULL; | |
987905de | 1264 | connected = 0; |
1da177e4 | 1265 | } |
63159f29 | 1266 | if (!opt) |
1da177e4 | 1267 | opt = np->opt; |
df9890c3 YH |
1268 | if (flowlabel) |
1269 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1270 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1271 | |
4c9483b2 | 1272 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1273 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1274 | fl6.daddr = *daddr; |
876c7f41 | 1275 | else |
4c9483b2 DM |
1276 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1277 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1278 | fl6.saddr = np->saddr; |
1958b856 | 1279 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1280 | |
4c9483b2 | 1281 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1282 | if (final_p) |
987905de | 1283 | connected = 0; |
1da177e4 | 1284 | |
4c9483b2 DM |
1285 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1286 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1287 | connected = 0; |
c4062dfc EH |
1288 | } else if (!fl6.flowi6_oif) |
1289 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1290 | |
4c9483b2 | 1291 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1292 | |
0e0d44ab | 1293 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1294 | if (IS_ERR(dst)) { |
1295 | err = PTR_ERR(dst); | |
1296 | dst = NULL; | |
1da177e4 | 1297 | goto out; |
14e50e57 | 1298 | } |
1da177e4 | 1299 | |
5c98631c LC |
1300 | if (hlimit < 0) |
1301 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1302 | |
e651f03a | 1303 | if (tclass < 0) |
41a1f8ea | 1304 | tclass = np->tclass; |
41a1f8ea | 1305 | |
1da177e4 LT |
1306 | if (msg->msg_flags&MSG_CONFIRM) |
1307 | goto do_confirm; | |
1308 | back_from_confirm: | |
1309 | ||
03485f2a VY |
1310 | /* Lockless fast path for the non-corking case */ |
1311 | if (!corkreq) { | |
1312 | struct sk_buff *skb; | |
1313 | ||
1314 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
1315 | sizeof(struct udphdr), hlimit, tclass, opt, | |
1316 | &fl6, (struct rt6_info *)dst, | |
1317 | msg->msg_flags, dontfrag); | |
1318 | err = PTR_ERR(skb); | |
1319 | if (!IS_ERR_OR_NULL(skb)) | |
1320 | err = udp_v6_send_skb(skb, &fl6); | |
1321 | goto release_dst; | |
1322 | } | |
1323 | ||
1da177e4 LT |
1324 | lock_sock(sk); |
1325 | if (unlikely(up->pending)) { | |
1326 | /* The socket is already corked while preparing it. */ | |
1327 | /* ... which is an evident application bug. --ANK */ | |
1328 | release_sock(sk); | |
1329 | ||
ba7a46f1 | 1330 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1331 | err = -EINVAL; |
1332 | goto out; | |
1333 | } | |
1334 | ||
1335 | up->pending = AF_INET6; | |
1336 | ||
1337 | do_append_data: | |
e36d3ff9 JP |
1338 | if (dontfrag < 0) |
1339 | dontfrag = np->dontfrag; | |
1da177e4 | 1340 | up->len += ulen; |
f69e6d13 | 1341 | err = ip6_append_data(sk, getfrag, msg, ulen, |
4c9483b2 | 1342 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
67ba4152 | 1343 | (struct rt6_info *)dst, |
13b52cd4 | 1344 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1345 | if (err) |
1346 | udp_v6_flush_pending_frames(sk); | |
1347 | else if (!corkreq) | |
4c0a6cb0 | 1348 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1349 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1350 | up->pending = 0; | |
1da177e4 | 1351 | |
03485f2a VY |
1352 | if (err > 0) |
1353 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1354 | release_sock(sk); | |
1355 | ||
1356 | release_dst: | |
a5e7c210 DM |
1357 | if (dst) { |
1358 | if (connected) { | |
1359 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1360 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1361 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1362 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1363 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1364 | &np->saddr : |
1365 | #endif | |
1366 | NULL); | |
a5e7c210 DM |
1367 | } else { |
1368 | dst_release(dst); | |
1369 | } | |
a3c96089 | 1370 | dst = NULL; |
a5e7c210 DM |
1371 | } |
1372 | ||
1da177e4 | 1373 | out: |
a3c96089 | 1374 | dst_release(dst); |
1da177e4 | 1375 | fl6_sock_release(flowlabel); |
cd562c98 | 1376 | if (!err) |
1da177e4 | 1377 | return len; |
a18135eb DM |
1378 | /* |
1379 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1380 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1381 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1382 | * things). We could add another new stat but at least for now that | |
1383 | * seems like overkill. | |
1384 | */ | |
1385 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1386 | UDP6_INC_STATS_USER(sock_net(sk), |
1387 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1388 | } |
1da177e4 LT |
1389 | return err; |
1390 | ||
1391 | do_confirm: | |
1392 | dst_confirm(dst); | |
1393 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1394 | goto back_from_confirm; | |
1395 | err = 0; | |
1396 | goto out; | |
1397 | } | |
1398 | ||
7d06b2e0 | 1399 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1400 | { |
44046a59 | 1401 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1402 | lock_sock(sk); |
1403 | udp_v6_flush_pending_frames(sk); | |
1404 | release_sock(sk); | |
1405 | ||
44046a59 TP |
1406 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1407 | void (*encap_destroy)(struct sock *sk); | |
1408 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1409 | if (encap_destroy) | |
1410 | encap_destroy(sk); | |
1411 | } | |
1412 | ||
1da177e4 | 1413 | inet6_destroy_sock(sk); |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | /* | |
1417 | * Socket option code for UDP | |
1418 | */ | |
ba4e58ec | 1419 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1420 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1421 | { |
db8dac20 | 1422 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1423 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1424 | udp_v6_push_pending_frames); | |
ba4e58ec | 1425 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1426 | } |
1427 | ||
1428 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1429 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1430 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1431 | { |
db8dac20 | 1432 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1433 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1434 | udp_v6_push_pending_frames); | |
ba4e58ec | 1435 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1436 | } |
1437 | #endif | |
1438 | ||
ba4e58ec GR |
1439 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1440 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1441 | { |
db8dac20 | 1442 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1443 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1444 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1445 | } |
1446 | ||
1447 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1448 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1449 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1450 | { |
db8dac20 | 1451 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1452 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1453 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1454 | } |
1455 | #endif | |
1456 | ||
41135cc8 | 1457 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1458 | .handler = udpv6_rcv, |
1459 | .err_handler = udpv6_err, | |
1460 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1461 | }; | |
1462 | ||
1463 | /* ------------------------------------------------------------------------ */ | |
1464 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1465 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1466 | { |
17ef66af LC |
1467 | if (v == SEQ_START_TOKEN) { |
1468 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1469 | } else { | |
1470 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1471 | struct inet_sock *inet = inet_sk(v); | |
1472 | __u16 srcp = ntohs(inet->inet_sport); | |
1473 | __u16 destp = ntohs(inet->inet_dport); | |
1474 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1475 | } | |
1da177e4 LT |
1476 | return 0; |
1477 | } | |
1478 | ||
73cb88ec AV |
1479 | static const struct file_operations udp6_afinfo_seq_fops = { |
1480 | .owner = THIS_MODULE, | |
1481 | .open = udp_seq_open, | |
1482 | .read = seq_read, | |
1483 | .llseek = seq_lseek, | |
1484 | .release = seq_release_net | |
1485 | }; | |
1486 | ||
1da177e4 | 1487 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1488 | .name = "udp6", |
1489 | .family = AF_INET6, | |
645ca708 | 1490 | .udp_table = &udp_table, |
73cb88ec | 1491 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1492 | .seq_ops = { |
1493 | .show = udp6_seq_show, | |
1494 | }, | |
1da177e4 LT |
1495 | }; |
1496 | ||
2c8c1e72 | 1497 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1498 | { |
0c96d8c5 | 1499 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1500 | } |
1501 | ||
ec120da6 IM |
1502 | void udp6_proc_exit(struct net *net) |
1503 | { | |
0c96d8c5 | 1504 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1505 | } |
1506 | #endif /* CONFIG_PROC_FS */ | |
1507 | ||
f77d6021 ED |
1508 | void udp_v6_clear_sk(struct sock *sk, int size) |
1509 | { | |
1510 | struct inet_sock *inet = inet_sk(sk); | |
1511 | ||
1512 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1513 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1514 | ||
1515 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1516 | memset(&inet->pinet6 + 1, 0, size); | |
1517 | } | |
1518 | ||
1da177e4 LT |
1519 | /* ------------------------------------------------------------------------ */ |
1520 | ||
1521 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1522 | .name = "UDPv6", |
1523 | .owner = THIS_MODULE, | |
ba4e58ec | 1524 | .close = udp_lib_close, |
543d9cfe ACM |
1525 | .connect = ip6_datagram_connect, |
1526 | .disconnect = udp_disconnect, | |
1527 | .ioctl = udp_ioctl, | |
1528 | .destroy = udpv6_destroy_sock, | |
1529 | .setsockopt = udpv6_setsockopt, | |
1530 | .getsockopt = udpv6_getsockopt, | |
1531 | .sendmsg = udpv6_sendmsg, | |
1532 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1533 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1534 | .hash = udp_lib_hash, |
1535 | .unhash = udp_lib_unhash, | |
719f8358 | 1536 | .rehash = udp_v6_rehash, |
543d9cfe | 1537 | .get_port = udp_v6_get_port, |
95766fff HA |
1538 | .memory_allocated = &udp_memory_allocated, |
1539 | .sysctl_mem = sysctl_udp_mem, | |
1540 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1541 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1542 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1543 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1544 | .h.udp_table = &udp_table, |
3fdadf7d | 1545 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1546 | .compat_setsockopt = compat_udpv6_setsockopt, |
1547 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1548 | #endif |
f77d6021 | 1549 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1550 | }; |
1551 | ||
1da177e4 LT |
1552 | static struct inet_protosw udpv6_protosw = { |
1553 | .type = SOCK_DGRAM, | |
1554 | .protocol = IPPROTO_UDP, | |
1555 | .prot = &udpv6_prot, | |
1556 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1557 | .flags = INET_PROTOSW_PERMANENT, |
1558 | }; | |
1559 | ||
7f4e4868 | 1560 | int __init udpv6_init(void) |
1da177e4 | 1561 | { |
7f4e4868 DL |
1562 | int ret; |
1563 | ||
3336288a VY |
1564 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1565 | if (ret) | |
c6b641a4 | 1566 | goto out; |
3336288a | 1567 | |
7f4e4868 DL |
1568 | ret = inet6_register_protosw(&udpv6_protosw); |
1569 | if (ret) | |
1570 | goto out_udpv6_protocol; | |
1571 | out: | |
1572 | return ret; | |
1573 | ||
1574 | out_udpv6_protocol: | |
1575 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1576 | goto out; | |
1577 | } | |
1578 | ||
09f7709f | 1579 | void udpv6_exit(void) |
7f4e4868 DL |
1580 | { |
1581 | inet6_unregister_protosw(&udpv6_protosw); | |
1582 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1583 | } |