Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | ||
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
72289b96 | 49 | #include <net/inet6_hashtables.h> |
076bb0c8 | 50 | #include <net/busy_poll.h> |
e32ea7e7 | 51 | #include <net/sock_reuseport.h> |
1da177e4 LT |
52 | |
53 | #include <linux/proc_fs.h> | |
54 | #include <linux/seq_file.h> | |
22911fc5 | 55 | #include <trace/events/skb.h> |
ba4e58ec | 56 | #include "udp_impl.h" |
1da177e4 | 57 | |
6eada011 ED |
58 | static u32 udp6_ehashfn(const struct net *net, |
59 | const struct in6_addr *laddr, | |
60 | const u16 lport, | |
61 | const struct in6_addr *faddr, | |
62 | const __be16 fport) | |
b50026b5 | 63 | { |
1bbdceef HFS |
64 | static u32 udp6_ehash_secret __read_mostly; |
65 | static u32 udp_ipv6_hash_secret __read_mostly; | |
66 | ||
67 | u32 lhash, fhash; | |
68 | ||
69 | net_get_random_once(&udp6_ehash_secret, | |
70 | sizeof(udp6_ehash_secret)); | |
71 | net_get_random_once(&udp_ipv6_hash_secret, | |
72 | sizeof(udp_ipv6_hash_secret)); | |
73 | ||
74 | lhash = (__force u32)laddr->s6_addr32[3]; | |
75 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
76 | ||
b50026b5 | 77 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 78 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
79 | } |
80 | ||
6eada011 ED |
81 | static u32 udp6_portaddr_hash(const struct net *net, |
82 | const struct in6_addr *addr6, | |
83 | unsigned int port) | |
d4cada4a ED |
84 | { |
85 | unsigned int hash, mix = net_hash_mix(net); | |
86 | ||
87 | if (ipv6_addr_any(addr6)) | |
88 | hash = jhash_1word(0, mix); | |
856540ee | 89 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 90 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 91 | else |
0eae88f3 | 92 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
93 | |
94 | return hash ^ port; | |
95 | } | |
96 | ||
6ba5a3c5 | 97 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 98 | { |
30fff923 ED |
99 | unsigned int hash2_nulladdr = |
100 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 101 | unsigned int hash2_partial = |
efe4208f | 102 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 103 | |
d4cada4a | 104 | /* precompute partial secondary hash */ |
30fff923 ED |
105 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
106 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
107 | } |
108 | ||
719f8358 ED |
109 | static void udp_v6_rehash(struct sock *sk) |
110 | { | |
111 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 112 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
113 | inet_sk(sk)->inet_num); |
114 | ||
115 | udp_lib_rehash(sk, new_hash); | |
116 | } | |
117 | ||
645ca708 ED |
118 | static inline int compute_score(struct sock *sk, struct net *net, |
119 | unsigned short hnum, | |
88440ae7 BS |
120 | const struct in6_addr *saddr, __be16 sport, |
121 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
122 | int dif) |
123 | { | |
60c04aec JP |
124 | int score; |
125 | struct inet_sock *inet; | |
126 | ||
127 | if (!net_eq(sock_net(sk), net) || | |
128 | udp_sk(sk)->udp_port_hash != hnum || | |
129 | sk->sk_family != PF_INET6) | |
130 | return -1; | |
131 | ||
132 | score = 0; | |
133 | inet = inet_sk(sk); | |
134 | ||
135 | if (inet->inet_dport) { | |
136 | if (inet->inet_dport != sport) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | ||
141 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
142 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
143 | return -1; | |
144 | score++; | |
145 | } | |
146 | ||
147 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
148 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
149 | return -1; | |
150 | score++; | |
151 | } | |
152 | ||
153 | if (sk->sk_bound_dev_if) { | |
154 | if (sk->sk_bound_dev_if != dif) | |
155 | return -1; | |
156 | score++; | |
645ca708 | 157 | } |
60c04aec | 158 | |
70da268b ED |
159 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
160 | score++; | |
161 | ||
645ca708 ED |
162 | return score; |
163 | } | |
164 | ||
fddc17de | 165 | static inline int compute_score2(struct sock *sk, struct net *net, |
60c04aec JP |
166 | const struct in6_addr *saddr, __be16 sport, |
167 | const struct in6_addr *daddr, | |
168 | unsigned short hnum, int dif) | |
fddc17de | 169 | { |
60c04aec JP |
170 | int score; |
171 | struct inet_sock *inet; | |
fddc17de | 172 | |
60c04aec JP |
173 | if (!net_eq(sock_net(sk), net) || |
174 | udp_sk(sk)->udp_port_hash != hnum || | |
175 | sk->sk_family != PF_INET6) | |
176 | return -1; | |
fddc17de | 177 | |
60c04aec JP |
178 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
179 | return -1; | |
180 | ||
181 | score = 0; | |
182 | inet = inet_sk(sk); | |
183 | ||
184 | if (inet->inet_dport) { | |
185 | if (inet->inet_dport != sport) | |
186 | return -1; | |
187 | score++; | |
188 | } | |
189 | ||
190 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
191 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de | 192 | return -1; |
60c04aec | 193 | score++; |
fddc17de | 194 | } |
60c04aec JP |
195 | |
196 | if (sk->sk_bound_dev_if) { | |
197 | if (sk->sk_bound_dev_if != dif) | |
198 | return -1; | |
199 | score++; | |
200 | } | |
201 | ||
70da268b ED |
202 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
203 | score++; | |
204 | ||
fddc17de ED |
205 | return score; |
206 | } | |
207 | ||
fddc17de ED |
208 | /* called with read_rcu_lock() */ |
209 | static struct sock *udp6_lib_lookup2(struct net *net, | |
210 | const struct in6_addr *saddr, __be16 sport, | |
211 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
1134158b CG |
212 | struct udp_hslot *hslot2, unsigned int slot2, |
213 | struct sk_buff *skb) | |
fddc17de ED |
214 | { |
215 | struct sock *sk, *result; | |
72289b96 TH |
216 | int score, badness, matches = 0, reuseport = 0; |
217 | u32 hash = 0; | |
fddc17de | 218 | |
fddc17de ED |
219 | result = NULL; |
220 | badness = -1; | |
ca065d0c | 221 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
fddc17de ED |
222 | score = compute_score2(sk, net, saddr, sport, |
223 | daddr, hnum, dif); | |
224 | if (score > badness) { | |
72289b96 TH |
225 | reuseport = sk->sk_reuseport; |
226 | if (reuseport) { | |
b50026b5 HFS |
227 | hash = udp6_ehashfn(net, daddr, hnum, |
228 | saddr, sport); | |
ed0dfffd | 229 | |
ca065d0c | 230 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 231 | sizeof(struct udphdr)); |
ca065d0c ED |
232 | if (result) |
233 | return result; | |
72289b96 | 234 | matches = 1; |
70da268b | 235 | } |
ca065d0c ED |
236 | result = sk; |
237 | badness = score; | |
72289b96 TH |
238 | } else if (score == badness && reuseport) { |
239 | matches++; | |
8fc54f68 | 240 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
241 | result = sk; |
242 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
243 | } |
244 | } | |
fddc17de ED |
245 | return result; |
246 | } | |
247 | ||
ca065d0c | 248 | /* rcu_read_lock() must be held */ |
fce82338 | 249 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
250 | const struct in6_addr *saddr, __be16 sport, |
251 | const struct in6_addr *daddr, __be16 dport, | |
538950a1 CG |
252 | int dif, struct udp_table *udptable, |
253 | struct sk_buff *skb) | |
1da177e4 | 254 | { |
271b72c7 | 255 | struct sock *sk, *result; |
1da177e4 | 256 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
257 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
258 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 TH |
259 | int score, badness, matches = 0, reuseport = 0; |
260 | u32 hash = 0; | |
645ca708 | 261 | |
fddc17de ED |
262 | if (hslot->count > 10) { |
263 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
264 | slot2 = hash2 & udptable->mask; | |
265 | hslot2 = &udptable->hash2[slot2]; | |
266 | if (hslot->count < hslot2->count) | |
267 | goto begin; | |
268 | ||
269 | result = udp6_lib_lookup2(net, saddr, sport, | |
270 | daddr, hnum, dif, | |
1134158b | 271 | hslot2, slot2, skb); |
fddc17de ED |
272 | if (!result) { |
273 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
274 | slot2 = hash2 & udptable->mask; | |
275 | hslot2 = &udptable->hash2[slot2]; | |
276 | if (hslot->count < hslot2->count) | |
277 | goto begin; | |
278 | ||
1223c67c JBD |
279 | result = udp6_lib_lookup2(net, saddr, sport, |
280 | &in6addr_any, hnum, dif, | |
1134158b | 281 | hslot2, slot2, skb); |
fddc17de | 282 | } |
fddc17de ED |
283 | return result; |
284 | } | |
271b72c7 ED |
285 | begin: |
286 | result = NULL; | |
287 | badness = -1; | |
ca065d0c | 288 | sk_for_each_rcu(sk, &hslot->head) { |
645ca708 ED |
289 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
290 | if (score > badness) { | |
72289b96 TH |
291 | reuseport = sk->sk_reuseport; |
292 | if (reuseport) { | |
b50026b5 HFS |
293 | hash = udp6_ehashfn(net, daddr, hnum, |
294 | saddr, sport); | |
ca065d0c | 295 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 296 | sizeof(struct udphdr)); |
ca065d0c ED |
297 | if (result) |
298 | return result; | |
72289b96 TH |
299 | matches = 1; |
300 | } | |
ca065d0c ED |
301 | result = sk; |
302 | badness = score; | |
72289b96 TH |
303 | } else if (score == badness && reuseport) { |
304 | matches++; | |
8fc54f68 | 305 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
306 | result = sk; |
307 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
308 | } |
309 | } | |
1da177e4 LT |
310 | return result; |
311 | } | |
fce82338 | 312 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 313 | |
607c4aaf KK |
314 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
315 | __be16 sport, __be16 dport, | |
645ca708 | 316 | struct udp_table *udptable) |
607c4aaf | 317 | { |
b71d1d42 | 318 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
ed7cbbce | 319 | struct sock *sk; |
607c4aaf | 320 | |
e5d08d71 IM |
321 | sk = skb_steal_sock(skb); |
322 | if (unlikely(sk)) | |
23542618 | 323 | return sk; |
ed7cbbce | 324 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 325 | &iph->daddr, dport, inet6_iif(skb), |
538950a1 | 326 | udptable, skb); |
607c4aaf KK |
327 | } |
328 | ||
63058308 TH |
329 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
330 | __be16 sport, __be16 dport) | |
331 | { | |
332 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
63058308 | 333 | |
ed7cbbce | 334 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
63058308 TH |
335 | &iph->daddr, dport, inet6_iif(skb), |
336 | &udp_table, skb); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); | |
339 | ||
ca065d0c ED |
340 | /* Must be called under rcu_read_lock(). |
341 | * Does increment socket refcount. | |
342 | */ | |
343 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
344 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) | |
aa976fc0 BS |
345 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
346 | const struct in6_addr *daddr, __be16 dport, int dif) | |
347 | { | |
ca065d0c ED |
348 | struct sock *sk; |
349 | ||
350 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
351 | dif, &udp_table, NULL); | |
352 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) | |
353 | sk = NULL; | |
354 | return sk; | |
aa976fc0 BS |
355 | } |
356 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 357 | #endif |
aa976fc0 | 358 | |
1da177e4 | 359 | /* |
67ba4152 IM |
360 | * This should be easy, if there is something there we |
361 | * return it, otherwise we block. | |
1da177e4 LT |
362 | */ |
363 | ||
1b784140 | 364 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
365 | int noblock, int flags, int *addr_len) |
366 | { | |
367 | struct ipv6_pinfo *np = inet6_sk(sk); | |
368 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 369 | struct sk_buff *skb; |
59c2cdae | 370 | unsigned int ulen, copied; |
627d2d6b | 371 | int peeked, peeking, off; |
759e5d00 HX |
372 | int err; |
373 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 374 | bool checksum_valid = false; |
f26ba175 | 375 | int is_udp4; |
8a74ad60 | 376 | bool slow; |
1da177e4 | 377 | |
1da177e4 | 378 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 379 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 380 | |
4b340ae2 | 381 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 382 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 383 | |
1da177e4 | 384 | try_again: |
627d2d6b | 385 | peeking = off = sk_peek_offset(sk, flags); |
a59322be | 386 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 387 | &peeked, &off, &err); |
1da177e4 | 388 | if (!skb) |
627d2d6b | 389 | return err; |
1da177e4 | 390 | |
e6afc8ac | 391 | ulen = skb->len; |
59c2cdae | 392 | copied = len; |
627d2d6b | 393 | if (copied > ulen - off) |
394 | copied = ulen - off; | |
59c2cdae | 395 | else if (copied < ulen) |
1ab1457c | 396 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 397 | |
f26ba175 WY |
398 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
399 | ||
ba4e58ec | 400 | /* |
759e5d00 HX |
401 | * If checksum is needed at all, try to do it while copying the |
402 | * data. If the data is truncated, or if we only want a partial | |
403 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 404 | */ |
ba4e58ec | 405 | |
627d2d6b | 406 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { |
197c949e ED |
407 | checksum_valid = !udp_lib_checksum_complete(skb); |
408 | if (!checksum_valid) | |
1da177e4 | 409 | goto csum_copy_err; |
ba4e58ec GR |
410 | } |
411 | ||
197c949e | 412 | if (checksum_valid || skb_csum_unnecessary(skb)) |
627d2d6b | 413 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
ba4e58ec | 414 | else { |
627d2d6b | 415 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
416 | if (err == -EINVAL) |
417 | goto csum_copy_err; | |
418 | } | |
22911fc5 ED |
419 | if (unlikely(err)) { |
420 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
421 | if (!peeked) { |
422 | atomic_inc(&sk->sk_drops); | |
423 | if (is_udp4) | |
6aef70a8 ED |
424 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
425 | is_udplite); | |
979402b1 | 426 | else |
6aef70a8 ED |
427 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
428 | is_udplite); | |
979402b1 | 429 | } |
627d2d6b | 430 | skb_free_datagram_locked(sk, skb); |
431 | return err; | |
22911fc5 | 432 | } |
f26ba175 WY |
433 | if (!peeked) { |
434 | if (is_udp4) | |
6aef70a8 ED |
435 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
436 | is_udplite); | |
f26ba175 | 437 | else |
6aef70a8 ED |
438 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
439 | is_udplite); | |
f26ba175 | 440 | } |
cb75994e | 441 | |
3b885787 | 442 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
443 | |
444 | /* Copy the address. */ | |
445 | if (msg->msg_name) { | |
342dfc30 | 446 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 447 | sin6->sin6_family = AF_INET6; |
4bedb452 | 448 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 449 | sin6->sin6_flowinfo = 0; |
1da177e4 | 450 | |
842df073 | 451 | if (is_udp4) { |
b301e82c BH |
452 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
453 | &sin6->sin6_addr); | |
842df073 HFS |
454 | sin6->sin6_scope_id = 0; |
455 | } else { | |
4e3fd7a0 | 456 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
457 | sin6->sin6_scope_id = |
458 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 459 | inet6_iif(skb)); |
1da177e4 | 460 | } |
bceaa902 | 461 | *addr_len = sizeof(*sin6); |
1da177e4 | 462 | } |
4b261c75 HFS |
463 | |
464 | if (np->rxopt.all) | |
465 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
466 | ||
f26ba175 | 467 | if (is_udp4) { |
1da177e4 LT |
468 | if (inet->cmsg_flags) |
469 | ip_cmsg_recv(msg, skb); | |
470 | } else { | |
471 | if (np->rxopt.all) | |
4b261c75 | 472 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 473 | } |
1da177e4 | 474 | |
59c2cdae | 475 | err = copied; |
1da177e4 | 476 | if (flags & MSG_TRUNC) |
759e5d00 | 477 | err = ulen; |
1da177e4 | 478 | |
627d2d6b | 479 | __skb_free_datagram_locked(sk, skb, peeking ? -err : err); |
1da177e4 LT |
480 | return err; |
481 | ||
482 | csum_copy_err: | |
8a74ad60 | 483 | slow = lock_sock_fast(sk); |
0856f939 | 484 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 | 485 | if (is_udp4) { |
6aef70a8 ED |
486 | UDP_INC_STATS(sock_net(sk), |
487 | UDP_MIB_CSUMERRORS, is_udplite); | |
488 | UDP_INC_STATS(sock_net(sk), | |
489 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 490 | } else { |
6aef70a8 ED |
491 | UDP6_INC_STATS(sock_net(sk), |
492 | UDP_MIB_CSUMERRORS, is_udplite); | |
493 | UDP6_INC_STATS(sock_net(sk), | |
494 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 495 | } |
0856f939 | 496 | } |
8a74ad60 | 497 | unlock_sock_fast(sk, slow); |
1da177e4 | 498 | |
beb39db5 ED |
499 | /* starting over for a new packet, but check if we need to yield */ |
500 | cond_resched(); | |
9cfaa8de | 501 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
502 | goto try_again; |
503 | } | |
504 | ||
ba4e58ec | 505 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 506 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 507 | struct udp_table *udptable) |
1da177e4 LT |
508 | { |
509 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
510 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
511 | const struct in6_addr *saddr = &hdr->saddr; | |
512 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 513 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 514 | struct sock *sk; |
e0d8c1b7 | 515 | int harderr; |
1da177e4 | 516 | int err; |
7304fe46 | 517 | struct net *net = dev_net(skb->dev); |
1da177e4 | 518 | |
e32ea7e7 | 519 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 520 | inet6_iif(skb), udptable, skb); |
63159f29 | 521 | if (!sk) { |
a16292a0 ED |
522 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
523 | ICMP6_MIB_INERRORS); | |
1da177e4 | 524 | return; |
7304fe46 | 525 | } |
1da177e4 | 526 | |
e0d8c1b7 WW |
527 | harderr = icmpv6_err_convert(type, code, &err); |
528 | np = inet6_sk(sk); | |
529 | ||
93b36cf3 HFS |
530 | if (type == ICMPV6_PKT_TOOBIG) { |
531 | if (!ip6_sk_accept_pmtu(sk)) | |
532 | goto out; | |
81aded24 | 533 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
534 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
535 | harderr = 1; | |
93b36cf3 | 536 | } |
1a462d18 | 537 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 538 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
539 | goto out; |
540 | } | |
81aded24 | 541 | |
e0d8c1b7 WW |
542 | if (!np->recverr) { |
543 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
544 | goto out; | |
545 | } else { | |
1da177e4 | 546 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 547 | } |
b1faf566 | 548 | |
1da177e4 LT |
549 | sk->sk_err = err; |
550 | sk->sk_error_report(sk); | |
551 | out: | |
ca065d0c | 552 | return; |
1da177e4 LT |
553 | } |
554 | ||
f7ad74fe BL |
555 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
556 | { | |
557 | int rc; | |
558 | ||
efe4208f | 559 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 560 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 561 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 562 | sk_incoming_cpu_update(sk); |
005ec974 | 563 | } |
f7ad74fe | 564 | |
e6afc8ac | 565 | rc = __sock_queue_rcv_skb(sk, skb); |
f7ad74fe BL |
566 | if (rc < 0) { |
567 | int is_udplite = IS_UDPLITE(sk); | |
568 | ||
569 | /* Note that an ENOMEM error is charged twice */ | |
570 | if (rc == -ENOMEM) | |
e61da9e2 | 571 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 572 | UDP_MIB_RCVBUFERRORS, is_udplite); |
e61da9e2 | 573 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
f7ad74fe BL |
574 | kfree_skb(skb); |
575 | return -1; | |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
ba4e58ec | 580 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 581 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 582 | u8 code, int offset, __be32 info) |
ba4e58ec | 583 | { |
645ca708 | 584 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
585 | } |
586 | ||
d7f3f621 BL |
587 | static struct static_key udpv6_encap_needed __read_mostly; |
588 | void udpv6_encap_enable(void) | |
589 | { | |
590 | if (!static_key_enabled(&udpv6_encap_needed)) | |
591 | static_key_slow_inc(&udpv6_encap_needed); | |
592 | } | |
593 | EXPORT_SYMBOL(udpv6_encap_enable); | |
594 | ||
f7ad74fe | 595 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 596 | { |
ba4e58ec | 597 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 598 | int rc; |
b2bf1e26 | 599 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 600 | |
ba4e58ec GR |
601 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
602 | goto drop; | |
1da177e4 | 603 | |
d7f3f621 BL |
604 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
605 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
606 | ||
607 | /* | |
608 | * This is an encapsulation socket so pass the skb to | |
609 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
610 | * fall through and pass this up the UDP socket. | |
611 | * up->encap_rcv() returns the following value: | |
612 | * =0 if skb was successfully passed to the encap | |
613 | * handler or was discarded by it. | |
614 | * >0 if skb should be passed on to UDP. | |
615 | * <0 if skb should be resubmitted as proto -N | |
616 | */ | |
617 | ||
618 | /* if we're overly short, let UDP handle it */ | |
619 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
e5aed006 | 620 | if (encap_rcv) { |
d7f3f621 BL |
621 | int ret; |
622 | ||
0a80966b TH |
623 | /* Verify checksum before giving to encap */ |
624 | if (udp_lib_checksum_complete(skb)) | |
625 | goto csum_error; | |
626 | ||
d7f3f621 BL |
627 | ret = encap_rcv(sk, skb); |
628 | if (ret <= 0) { | |
02c22347 ED |
629 | __UDP_INC_STATS(sock_net(sk), |
630 | UDP_MIB_INDATAGRAMS, | |
631 | is_udplite); | |
d7f3f621 BL |
632 | return -ret; |
633 | } | |
634 | } | |
635 | ||
636 | /* FALLTHROUGH -- it's a UDP Packet */ | |
637 | } | |
638 | ||
ba4e58ec GR |
639 | /* |
640 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
641 | */ | |
b2bf1e26 | 642 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
643 | |
644 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
645 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
646 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
647 | goto drop; |
648 | } | |
649 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
650 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
651 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
652 | goto drop; |
653 | } | |
1da177e4 LT |
654 | } |
655 | ||
ce25d66a ED |
656 | if (rcu_access_pointer(sk->sk_filter) && |
657 | udp_lib_checksum_complete(skb)) | |
658 | goto csum_error; | |
659 | ||
660 | if (sk_filter(sk, skb)) | |
661 | goto drop; | |
ba4e58ec | 662 | |
e6afc8ac | 663 | udp_csum_pull_header(skb); |
274f482d | 664 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
02c22347 ED |
665 | __UDP6_INC_STATS(sock_net(sk), |
666 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 667 | goto drop; |
3e215c8d | 668 | } |
cb80ef46 | 669 | |
d826eb14 | 670 | skb_dst_drop(skb); |
cb75994e | 671 | |
cb80ef46 BL |
672 | bh_lock_sock(sk); |
673 | rc = 0; | |
674 | if (!sock_owned_by_user(sk)) | |
675 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
676 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
677 | bh_unlock_sock(sk); | |
678 | goto drop; | |
679 | } | |
680 | bh_unlock_sock(sk); | |
f7ad74fe BL |
681 | |
682 | return rc; | |
3e215c8d | 683 | |
6a5dc9e5 | 684 | csum_error: |
02c22347 | 685 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 686 | drop: |
02c22347 | 687 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 688 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
689 | kfree_skb(skb); |
690 | return -1; | |
1da177e4 LT |
691 | } |
692 | ||
5cf3d461 DH |
693 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
694 | __be16 loc_port, const struct in6_addr *loc_addr, | |
695 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
696 | int dif, unsigned short hnum) | |
1da177e4 | 697 | { |
5cf3d461 | 698 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 699 | |
5cf3d461 DH |
700 | if (!net_eq(sock_net(sk), net)) |
701 | return false; | |
702 | ||
703 | if (udp_sk(sk)->udp_port_hash != hnum || | |
704 | sk->sk_family != PF_INET6 || | |
705 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
706 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
707 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
708 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
709 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
710 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
711 | return false; |
712 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
713 | return false; | |
714 | return true; | |
1da177e4 LT |
715 | } |
716 | ||
4068579e TH |
717 | static void udp6_csum_zero_error(struct sk_buff *skb) |
718 | { | |
719 | /* RFC 2460 section 8.1 says that we SHOULD log | |
720 | * this error. Well, it is reasonable. | |
721 | */ | |
ba7a46f1 JP |
722 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
723 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
724 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
725 | } |
726 | ||
1da177e4 LT |
727 | /* |
728 | * Note: called only from the BH handler context, | |
729 | * so we don't need to lock the hashes. | |
730 | */ | |
e3163493 | 731 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 732 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 733 | struct udp_table *udptable, int proto) |
1da177e4 | 734 | { |
ca065d0c | 735 | struct sock *sk, *first = NULL; |
4bedb452 | 736 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
737 | unsigned short hnum = ntohs(uh->dest); |
738 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 739 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 740 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
741 | int dif = inet6_iif(skb); |
742 | struct hlist_node *node; | |
743 | struct sk_buff *nskb; | |
2dc41cff DH |
744 | |
745 | if (use_hash2) { | |
746 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
747 | udp_table.mask; | |
748 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
749 | start_lookup: | |
750 | hslot = &udp_table.hash2[hash2]; | |
751 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
752 | } | |
1da177e4 | 753 | |
ca065d0c ED |
754 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
755 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
756 | uh->source, saddr, dif, hnum)) | |
757 | continue; | |
758 | /* If zero checksum and no_check is not on for | |
759 | * the socket then skip it. | |
760 | */ | |
761 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
762 | continue; | |
763 | if (!first) { | |
764 | first = sk; | |
765 | continue; | |
766 | } | |
767 | nskb = skb_clone(skb, GFP_ATOMIC); | |
768 | if (unlikely(!nskb)) { | |
769 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
770 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
771 | IS_UDPLITE(sk)); | |
772 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
773 | IS_UDPLITE(sk)); | |
ca065d0c | 774 | continue; |
95766fff | 775 | } |
a1ab77f9 | 776 | |
ca065d0c ED |
777 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
778 | consume_skb(nskb); | |
779 | } | |
a1ab77f9 | 780 | |
2dc41cff DH |
781 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
782 | if (use_hash2 && hash2 != hash2_any) { | |
783 | hash2 = hash2_any; | |
784 | goto start_lookup; | |
785 | } | |
786 | ||
ca065d0c ED |
787 | if (first) { |
788 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
789 | consume_skb(skb); | |
a1ab77f9 | 790 | } else { |
ca065d0c | 791 | kfree_skb(skb); |
02c22347 ED |
792 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
793 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 794 | } |
ba4e58ec | 795 | return 0; |
1da177e4 LT |
796 | } |
797 | ||
645ca708 | 798 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 799 | int proto) |
1da177e4 | 800 | { |
ca065d0c | 801 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 802 | struct net *net = dev_net(skb->dev); |
1ab1457c | 803 | struct udphdr *uh; |
ca065d0c | 804 | struct sock *sk; |
1da177e4 LT |
805 | u32 ulen = 0; |
806 | ||
807 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 808 | goto discard; |
1da177e4 | 809 | |
0660e03f ACM |
810 | saddr = &ipv6_hdr(skb)->saddr; |
811 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 812 | uh = udp_hdr(skb); |
1da177e4 LT |
813 | |
814 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
815 | if (ulen > skb->len) |
816 | goto short_packet; | |
1da177e4 | 817 | |
759e5d00 HX |
818 | if (proto == IPPROTO_UDP) { |
819 | /* UDP validates ulen. */ | |
1da177e4 | 820 | |
ba4e58ec GR |
821 | /* Check for jumbo payload */ |
822 | if (ulen == 0) | |
823 | ulen = skb->len; | |
1da177e4 | 824 | |
ba4e58ec GR |
825 | if (ulen < sizeof(*uh)) |
826 | goto short_packet; | |
1da177e4 | 827 | |
ba4e58ec GR |
828 | if (ulen < skb->len) { |
829 | if (pskb_trim_rcsum(skb, ulen)) | |
830 | goto short_packet; | |
0660e03f ACM |
831 | saddr = &ipv6_hdr(skb)->saddr; |
832 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 833 | uh = udp_hdr(skb); |
ba4e58ec | 834 | } |
ba4e58ec | 835 | } |
1da177e4 | 836 | |
759e5d00 | 837 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 838 | goto csum_error; |
759e5d00 | 839 | |
1ab1457c YH |
840 | /* |
841 | * Multicast receive code | |
1da177e4 | 842 | */ |
ba4e58ec | 843 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 844 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 845 | saddr, daddr, udptable, proto); |
1da177e4 LT |
846 | |
847 | /* Unicast */ | |
848 | ||
1ab1457c | 849 | /* |
1da177e4 LT |
850 | * check socket cache ... must talk to Alan about his plans |
851 | * for sock caches... i'll skip this for now. | |
852 | */ | |
607c4aaf | 853 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 854 | if (sk) { |
a5b50476 ET |
855 | int ret; |
856 | ||
1c19448c | 857 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
4068579e TH |
858 | udp6_csum_zero_error(skb); |
859 | goto csum_error; | |
860 | } | |
861 | ||
224d019c | 862 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
863 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
864 | ip6_compute_pseudo); | |
865 | ||
a5b50476 | 866 | ret = udpv6_queue_rcv_skb(sk, skb); |
1da177e4 | 867 | |
59dca1d8 | 868 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 869 | if (ret > 0) |
59dca1d8 | 870 | return ret; |
1da177e4 | 871 | |
add459aa | 872 | return 0; |
1da177e4 | 873 | } |
1ab1457c | 874 | |
4068579e TH |
875 | if (!uh->check) { |
876 | udp6_csum_zero_error(skb); | |
877 | goto csum_error; | |
878 | } | |
879 | ||
cb80ef46 | 880 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 881 | goto discard; |
cb80ef46 BL |
882 | |
883 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 884 | goto csum_error; |
cb80ef46 | 885 | |
02c22347 | 886 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
887 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
888 | ||
889 | kfree_skb(skb); | |
add459aa | 890 | return 0; |
1da177e4 | 891 | |
1ab1457c | 892 | short_packet: |
ba7a46f1 JP |
893 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
894 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
895 | saddr, ntohs(uh->source), | |
896 | ulen, skb->len, | |
897 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
898 | goto discard; |
899 | csum_error: | |
02c22347 | 900 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 901 | discard: |
02c22347 | 902 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 903 | kfree_skb(skb); |
add459aa | 904 | return 0; |
1da177e4 | 905 | } |
ba4e58ec | 906 | |
e5bbef20 | 907 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 908 | { |
645ca708 | 909 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
910 | } |
911 | ||
1da177e4 LT |
912 | /* |
913 | * Throw away all pending data and cancel the corking. Socket is locked. | |
914 | */ | |
915 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
916 | { | |
917 | struct udp_sock *up = udp_sk(sk); | |
918 | ||
36d926b9 DL |
919 | if (up->pending == AF_INET) |
920 | udp_flush_pending_frames(sk); | |
921 | else if (up->pending) { | |
1da177e4 LT |
922 | up->len = 0; |
923 | up->pending = 0; | |
924 | ip6_flush_pending_frames(sk); | |
1ab1457c | 925 | } |
1da177e4 LT |
926 | } |
927 | ||
493c6be3 | 928 | /** |
67ba4152 IM |
929 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
930 | * @sk: socket we are sending on | |
931 | * @skb: sk_buff containing the filled-in UDP header | |
932 | * (checksum field must be zeroed out) | |
493c6be3 SS |
933 | */ |
934 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
935 | const struct in6_addr *saddr, | |
936 | const struct in6_addr *daddr, int len) | |
937 | { | |
938 | unsigned int offset; | |
939 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 940 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
941 | __wsum csum = 0; |
942 | ||
d39d938c | 943 | if (!frags) { |
493c6be3 SS |
944 | /* Only one fragment on the socket. */ |
945 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
946 | skb->csum_offset = offsetof(struct udphdr, check); | |
947 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
948 | } else { | |
949 | /* | |
950 | * HW-checksum won't work as there are two or more | |
951 | * fragments on the socket so that all csums of sk_buffs | |
952 | * should be together | |
953 | */ | |
954 | offset = skb_transport_offset(skb); | |
955 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
956 | ||
957 | skb->ip_summed = CHECKSUM_NONE; | |
958 | ||
d39d938c VY |
959 | do { |
960 | csum = csum_add(csum, frags->csum); | |
961 | } while ((frags = frags->next)); | |
493c6be3 SS |
962 | |
963 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
964 | csum); | |
965 | if (uh->check == 0) | |
966 | uh->check = CSUM_MANGLED_0; | |
967 | } | |
968 | } | |
969 | ||
1da177e4 LT |
970 | /* |
971 | * Sending | |
972 | */ | |
973 | ||
d39d938c | 974 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 975 | { |
d39d938c | 976 | struct sock *sk = skb->sk; |
1da177e4 | 977 | struct udphdr *uh; |
1da177e4 | 978 | int err = 0; |
b2bf1e26 | 979 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 980 | __wsum csum = 0; |
d39d938c VY |
981 | int offset = skb_transport_offset(skb); |
982 | int len = skb->len - offset; | |
1da177e4 LT |
983 | |
984 | /* | |
985 | * Create a UDP header | |
986 | */ | |
4bedb452 | 987 | uh = udp_hdr(skb); |
1958b856 DM |
988 | uh->source = fl6->fl6_sport; |
989 | uh->dest = fl6->fl6_dport; | |
d39d938c | 990 | uh->len = htons(len); |
1da177e4 LT |
991 | uh->check = 0; |
992 | ||
b2bf1e26 | 993 | if (is_udplite) |
d39d938c VY |
994 | csum = udplite_csum(skb); |
995 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
996 | skb->ip_summed = CHECKSUM_NONE; |
997 | goto send; | |
998 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 999 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1000 | goto send; |
1001 | } else | |
d39d938c | 1002 | csum = udp_csum(skb); |
1da177e4 | 1003 | |
ba4e58ec | 1004 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1005 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1006 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1007 | if (uh->check == 0) |
f6ab0288 | 1008 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1009 | |
493c6be3 | 1010 | send: |
d39d938c | 1011 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1012 | if (err) { |
1013 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1014 | UDP6_INC_STATS(sock_net(sk), |
1015 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1016 | err = 0; |
1017 | } | |
6aef70a8 ED |
1018 | } else { |
1019 | UDP6_INC_STATS(sock_net(sk), | |
1020 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1021 | } | |
d39d938c VY |
1022 | return err; |
1023 | } | |
1024 | ||
1025 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1026 | { | |
1027 | struct sk_buff *skb; | |
1028 | struct udp_sock *up = udp_sk(sk); | |
1029 | struct flowi6 fl6; | |
1030 | int err = 0; | |
1031 | ||
1032 | if (up->pending == AF_INET) | |
1033 | return udp_push_pending_frames(sk); | |
1034 | ||
1035 | /* ip6_finish_skb will release the cork, so make a copy of | |
1036 | * fl6 here. | |
1037 | */ | |
1038 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1039 | ||
1040 | skb = ip6_finish_skb(sk); | |
1041 | if (!skb) | |
1042 | goto out; | |
1043 | ||
1044 | err = udp_v6_send_skb(skb, &fl6); | |
1045 | ||
1da177e4 LT |
1046 | out: |
1047 | up->len = 0; | |
1048 | up->pending = 0; | |
1049 | return err; | |
1050 | } | |
1051 | ||
1b784140 | 1052 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1053 | { |
1054 | struct ipv6_txoptions opt_space; | |
1055 | struct udp_sock *up = udp_sk(sk); | |
1056 | struct inet_sock *inet = inet_sk(sk); | |
1057 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1058 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1059 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1060 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1061 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1062 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1063 | struct flowi6 fl6; |
1da177e4 | 1064 | struct dst_entry *dst; |
26879da5 | 1065 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
1066 | int addr_len = msg->msg_namelen; |
1067 | int ulen = len; | |
1da177e4 LT |
1068 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1069 | int err; | |
987905de | 1070 | int connected = 0; |
b2bf1e26 | 1071 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1072 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
ad1e46a8 | 1073 | struct sockcm_cookie sockc; |
1da177e4 | 1074 | |
26879da5 WW |
1075 | ipc6.hlimit = -1; |
1076 | ipc6.tclass = -1; | |
1077 | ipc6.dontfrag = -1; | |
1078 | ||
1da177e4 LT |
1079 | /* destination address check */ |
1080 | if (sin6) { | |
1081 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | switch (sin6->sin6_family) { | |
1085 | case AF_INET6: | |
1086 | if (addr_len < SIN6_LEN_RFC2133) | |
1087 | return -EINVAL; | |
1088 | daddr = &sin6->sin6_addr; | |
1089 | break; | |
1090 | case AF_INET: | |
1091 | goto do_udp_sendmsg; | |
1092 | case AF_UNSPEC: | |
1093 | msg->msg_name = sin6 = NULL; | |
1094 | msg->msg_namelen = addr_len = 0; | |
1095 | daddr = NULL; | |
1096 | break; | |
1097 | default: | |
1098 | return -EINVAL; | |
1099 | } | |
1100 | } else if (!up->pending) { | |
1101 | if (sk->sk_state != TCP_ESTABLISHED) | |
1102 | return -EDESTADDRREQ; | |
efe4208f | 1103 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1104 | } else |
1da177e4 LT |
1105 | daddr = NULL; |
1106 | ||
1107 | if (daddr) { | |
e773e4fa | 1108 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1109 | struct sockaddr_in sin; |
1110 | sin.sin_family = AF_INET; | |
c720c7e8 | 1111 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1112 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1113 | msg->msg_name = &sin; | |
1114 | msg->msg_namelen = sizeof(sin); | |
1115 | do_udp_sendmsg: | |
1116 | if (__ipv6_only_sock(sk)) | |
1117 | return -ENETUNREACH; | |
1b784140 | 1118 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1119 | } |
1120 | } | |
1121 | ||
1122 | if (up->pending == AF_INET) | |
1b784140 | 1123 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1124 | |
1125 | /* Rough check on arithmetic overflow, | |
b59e139b | 1126 | better check is made in ip6_append_data(). |
1da177e4 LT |
1127 | */ |
1128 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1129 | return -EMSGSIZE; | |
1ab1457c | 1130 | |
03485f2a | 1131 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1132 | if (up->pending) { |
1133 | /* | |
1134 | * There are pending frames. | |
1135 | * The socket lock must be held while it's corked. | |
1136 | */ | |
1137 | lock_sock(sk); | |
1138 | if (likely(up->pending)) { | |
1139 | if (unlikely(up->pending != AF_INET6)) { | |
1140 | release_sock(sk); | |
1141 | return -EAFNOSUPPORT; | |
1142 | } | |
1143 | dst = NULL; | |
1144 | goto do_append_data; | |
1145 | } | |
1146 | release_sock(sk); | |
1147 | } | |
1148 | ulen += sizeof(struct udphdr); | |
1149 | ||
4c9483b2 | 1150 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1151 | |
1152 | if (sin6) { | |
1153 | if (sin6->sin6_port == 0) | |
1154 | return -EINVAL; | |
1155 | ||
1958b856 | 1156 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1157 | daddr = &sin6->sin6_addr; |
1158 | ||
1159 | if (np->sndflow) { | |
4c9483b2 DM |
1160 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1161 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1162 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1163 | if (!flowlabel) |
1da177e4 | 1164 | return -EINVAL; |
1da177e4 LT |
1165 | } |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Otherwise it will be difficult to maintain | |
1170 | * sk->sk_dst_cache. | |
1171 | */ | |
1172 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1173 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1174 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1175 | |
1176 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1177 | sin6->sin6_scope_id && | |
842df073 | 1178 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1179 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1180 | } else { |
1181 | if (sk->sk_state != TCP_ESTABLISHED) | |
1182 | return -EDESTADDRREQ; | |
1183 | ||
1958b856 | 1184 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1185 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1186 | fl6.flowlabel = np->flow_label; |
987905de | 1187 | connected = 1; |
1da177e4 LT |
1188 | } |
1189 | ||
4c9483b2 DM |
1190 | if (!fl6.flowi6_oif) |
1191 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1192 | |
4c9483b2 DM |
1193 | if (!fl6.flowi6_oif) |
1194 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1195 | |
4c9483b2 | 1196 | fl6.flowi6_mark = sk->sk_mark; |
c14ac945 | 1197 | sockc.tsflags = sk->sk_tsflags; |
51953d5b | 1198 | |
1da177e4 LT |
1199 | if (msg->msg_controllen) { |
1200 | opt = &opt_space; | |
1201 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1202 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1203 | ipc6.opt = opt; |
1da177e4 | 1204 | |
26879da5 | 1205 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); |
1da177e4 LT |
1206 | if (err < 0) { |
1207 | fl6_sock_release(flowlabel); | |
1208 | return err; | |
1209 | } | |
4c9483b2 DM |
1210 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1211 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1212 | if (!flowlabel) |
1da177e4 LT |
1213 | return -EINVAL; |
1214 | } | |
1215 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1216 | opt = NULL; | |
987905de | 1217 | connected = 0; |
1da177e4 | 1218 | } |
45f6fad8 ED |
1219 | if (!opt) { |
1220 | opt = txopt_get(np); | |
1221 | opt_to_free = opt; | |
1222 | } | |
df9890c3 YH |
1223 | if (flowlabel) |
1224 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1225 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1226 | ipc6.opt = opt; |
1da177e4 | 1227 | |
4c9483b2 | 1228 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1229 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1230 | fl6.daddr = *daddr; |
876c7f41 | 1231 | else |
4c9483b2 DM |
1232 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1233 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1234 | fl6.saddr = np->saddr; |
1958b856 | 1235 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1236 | |
4c9483b2 | 1237 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1238 | if (final_p) |
987905de | 1239 | connected = 0; |
1da177e4 | 1240 | |
4c9483b2 DM |
1241 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1242 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1243 | connected = 0; |
c4062dfc EH |
1244 | } else if (!fl6.flowi6_oif) |
1245 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1246 | |
4c9483b2 | 1247 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1248 | |
0e0d44ab | 1249 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1250 | if (IS_ERR(dst)) { |
1251 | err = PTR_ERR(dst); | |
1252 | dst = NULL; | |
1da177e4 | 1253 | goto out; |
14e50e57 | 1254 | } |
1da177e4 | 1255 | |
26879da5 WW |
1256 | if (ipc6.hlimit < 0) |
1257 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1258 | |
26879da5 WW |
1259 | if (ipc6.tclass < 0) |
1260 | ipc6.tclass = np->tclass; | |
41a1f8ea | 1261 | |
1da177e4 LT |
1262 | if (msg->msg_flags&MSG_CONFIRM) |
1263 | goto do_confirm; | |
1264 | back_from_confirm: | |
1265 | ||
03485f2a VY |
1266 | /* Lockless fast path for the non-corking case */ |
1267 | if (!corkreq) { | |
1268 | struct sk_buff *skb; | |
1269 | ||
1270 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1271 | sizeof(struct udphdr), &ipc6, |
03485f2a | 1272 | &fl6, (struct rt6_info *)dst, |
26879da5 | 1273 | msg->msg_flags, &sockc); |
03485f2a VY |
1274 | err = PTR_ERR(skb); |
1275 | if (!IS_ERR_OR_NULL(skb)) | |
1276 | err = udp_v6_send_skb(skb, &fl6); | |
1277 | goto release_dst; | |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | lock_sock(sk); |
1281 | if (unlikely(up->pending)) { | |
1282 | /* The socket is already corked while preparing it. */ | |
1283 | /* ... which is an evident application bug. --ANK */ | |
1284 | release_sock(sk); | |
1285 | ||
ba7a46f1 | 1286 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1287 | err = -EINVAL; |
1288 | goto out; | |
1289 | } | |
1290 | ||
1291 | up->pending = AF_INET6; | |
1292 | ||
1293 | do_append_data: | |
26879da5 WW |
1294 | if (ipc6.dontfrag < 0) |
1295 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1296 | up->len += ulen; |
26879da5 WW |
1297 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
1298 | &ipc6, &fl6, (struct rt6_info *)dst, | |
1299 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); | |
1da177e4 LT |
1300 | if (err) |
1301 | udp_v6_flush_pending_frames(sk); | |
1302 | else if (!corkreq) | |
4c0a6cb0 | 1303 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1304 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1305 | up->pending = 0; | |
1da177e4 | 1306 | |
03485f2a VY |
1307 | if (err > 0) |
1308 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1309 | release_sock(sk); | |
1310 | ||
1311 | release_dst: | |
a5e7c210 DM |
1312 | if (dst) { |
1313 | if (connected) { | |
1314 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1315 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1316 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1317 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1318 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1319 | &np->saddr : |
1320 | #endif | |
1321 | NULL); | |
a5e7c210 DM |
1322 | } else { |
1323 | dst_release(dst); | |
1324 | } | |
a3c96089 | 1325 | dst = NULL; |
a5e7c210 DM |
1326 | } |
1327 | ||
1da177e4 | 1328 | out: |
a3c96089 | 1329 | dst_release(dst); |
1da177e4 | 1330 | fl6_sock_release(flowlabel); |
45f6fad8 | 1331 | txopt_put(opt_to_free); |
cd562c98 | 1332 | if (!err) |
1da177e4 | 1333 | return len; |
a18135eb DM |
1334 | /* |
1335 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1336 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1337 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1338 | * things). We could add another new stat but at least for now that | |
1339 | * seems like overkill. | |
1340 | */ | |
1341 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1342 | UDP6_INC_STATS(sock_net(sk), |
1343 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1344 | } |
1da177e4 LT |
1345 | return err; |
1346 | ||
1347 | do_confirm: | |
1348 | dst_confirm(dst); | |
1349 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1350 | goto back_from_confirm; | |
1351 | err = 0; | |
1352 | goto out; | |
1353 | } | |
1354 | ||
7d06b2e0 | 1355 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1356 | { |
44046a59 | 1357 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1358 | lock_sock(sk); |
1359 | udp_v6_flush_pending_frames(sk); | |
1360 | release_sock(sk); | |
1361 | ||
44046a59 TP |
1362 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1363 | void (*encap_destroy)(struct sock *sk); | |
1364 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1365 | if (encap_destroy) | |
1366 | encap_destroy(sk); | |
1367 | } | |
1368 | ||
1da177e4 | 1369 | inet6_destroy_sock(sk); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | /* | |
1373 | * Socket option code for UDP | |
1374 | */ | |
ba4e58ec | 1375 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1376 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1377 | { |
db8dac20 | 1378 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1379 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1380 | udp_v6_push_pending_frames); | |
ba4e58ec | 1381 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1382 | } |
1383 | ||
1384 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1385 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1386 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1387 | { |
db8dac20 | 1388 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1389 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1390 | udp_v6_push_pending_frames); | |
ba4e58ec | 1391 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1392 | } |
1393 | #endif | |
1394 | ||
ba4e58ec GR |
1395 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1396 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1397 | { |
db8dac20 | 1398 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1399 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1400 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1401 | } |
1402 | ||
1403 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1404 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1405 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1406 | { |
db8dac20 | 1407 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1408 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1409 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1410 | } |
1411 | #endif | |
1412 | ||
41135cc8 | 1413 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1414 | .handler = udpv6_rcv, |
1415 | .err_handler = udpv6_err, | |
1416 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1417 | }; | |
1418 | ||
1419 | /* ------------------------------------------------------------------------ */ | |
1420 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1421 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1422 | { |
17ef66af LC |
1423 | if (v == SEQ_START_TOKEN) { |
1424 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1425 | } else { | |
1426 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1427 | struct inet_sock *inet = inet_sk(v); | |
1428 | __u16 srcp = ntohs(inet->inet_sport); | |
1429 | __u16 destp = ntohs(inet->inet_dport); | |
1430 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1431 | } | |
1da177e4 LT |
1432 | return 0; |
1433 | } | |
1434 | ||
73cb88ec AV |
1435 | static const struct file_operations udp6_afinfo_seq_fops = { |
1436 | .owner = THIS_MODULE, | |
1437 | .open = udp_seq_open, | |
1438 | .read = seq_read, | |
1439 | .llseek = seq_lseek, | |
1440 | .release = seq_release_net | |
1441 | }; | |
1442 | ||
1da177e4 | 1443 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1444 | .name = "udp6", |
1445 | .family = AF_INET6, | |
645ca708 | 1446 | .udp_table = &udp_table, |
73cb88ec | 1447 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1448 | .seq_ops = { |
1449 | .show = udp6_seq_show, | |
1450 | }, | |
1da177e4 LT |
1451 | }; |
1452 | ||
2c8c1e72 | 1453 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1454 | { |
0c96d8c5 | 1455 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1456 | } |
1457 | ||
ec120da6 IM |
1458 | void udp6_proc_exit(struct net *net) |
1459 | { | |
0c96d8c5 | 1460 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1461 | } |
1462 | #endif /* CONFIG_PROC_FS */ | |
1463 | ||
f77d6021 ED |
1464 | void udp_v6_clear_sk(struct sock *sk, int size) |
1465 | { | |
1466 | struct inet_sock *inet = inet_sk(sk); | |
1467 | ||
1468 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1469 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1470 | ||
1471 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1472 | memset(&inet->pinet6 + 1, 0, size); | |
1473 | } | |
1474 | ||
1da177e4 LT |
1475 | /* ------------------------------------------------------------------------ */ |
1476 | ||
1477 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1478 | .name = "UDPv6", |
1479 | .owner = THIS_MODULE, | |
ba4e58ec | 1480 | .close = udp_lib_close, |
543d9cfe ACM |
1481 | .connect = ip6_datagram_connect, |
1482 | .disconnect = udp_disconnect, | |
1483 | .ioctl = udp_ioctl, | |
1484 | .destroy = udpv6_destroy_sock, | |
1485 | .setsockopt = udpv6_setsockopt, | |
1486 | .getsockopt = udpv6_getsockopt, | |
1487 | .sendmsg = udpv6_sendmsg, | |
1488 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1489 | .backlog_rcv = __udpv6_queue_rcv_skb, |
e646b657 | 1490 | .release_cb = ip6_datagram_release_cb, |
ba4e58ec GR |
1491 | .hash = udp_lib_hash, |
1492 | .unhash = udp_lib_unhash, | |
719f8358 | 1493 | .rehash = udp_v6_rehash, |
543d9cfe | 1494 | .get_port = udp_v6_get_port, |
95766fff HA |
1495 | .memory_allocated = &udp_memory_allocated, |
1496 | .sysctl_mem = sysctl_udp_mem, | |
1497 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1498 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1499 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1500 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1501 | .h.udp_table = &udp_table, |
3fdadf7d | 1502 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1503 | .compat_setsockopt = compat_udpv6_setsockopt, |
1504 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1505 | #endif |
f77d6021 | 1506 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1507 | }; |
1508 | ||
1da177e4 LT |
1509 | static struct inet_protosw udpv6_protosw = { |
1510 | .type = SOCK_DGRAM, | |
1511 | .protocol = IPPROTO_UDP, | |
1512 | .prot = &udpv6_prot, | |
1513 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1514 | .flags = INET_PROTOSW_PERMANENT, |
1515 | }; | |
1516 | ||
7f4e4868 | 1517 | int __init udpv6_init(void) |
1da177e4 | 1518 | { |
7f4e4868 DL |
1519 | int ret; |
1520 | ||
3336288a VY |
1521 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1522 | if (ret) | |
c6b641a4 | 1523 | goto out; |
3336288a | 1524 | |
7f4e4868 DL |
1525 | ret = inet6_register_protosw(&udpv6_protosw); |
1526 | if (ret) | |
1527 | goto out_udpv6_protocol; | |
1528 | out: | |
1529 | return ret; | |
1530 | ||
1531 | out_udpv6_protocol: | |
1532 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1533 | goto out; | |
1534 | } | |
1535 | ||
09f7709f | 1536 | void udpv6_exit(void) |
7f4e4868 DL |
1537 | { |
1538 | inet6_unregister_protosw(&udpv6_protosw); | |
1539 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1540 | } |