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 | { |
23542618 | 318 | struct sock *sk; |
b71d1d42 | 319 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 320 | |
e5d08d71 IM |
321 | sk = skb_steal_sock(skb); |
322 | if (unlikely(sk)) | |
23542618 | 323 | return sk; |
adf30907 ED |
324 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
325 | &iph->daddr, dport, inet6_iif(skb), | |
538950a1 | 326 | udptable, skb); |
607c4aaf KK |
327 | } |
328 | ||
ca065d0c ED |
329 | /* Must be called under rcu_read_lock(). |
330 | * Does increment socket refcount. | |
331 | */ | |
332 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
333 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) | |
aa976fc0 BS |
334 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
335 | const struct in6_addr *daddr, __be16 dport, int dif) | |
336 | { | |
ca065d0c ED |
337 | struct sock *sk; |
338 | ||
339 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
340 | dif, &udp_table, NULL); | |
341 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) | |
342 | sk = NULL; | |
343 | return sk; | |
aa976fc0 BS |
344 | } |
345 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 346 | #endif |
aa976fc0 | 347 | |
1da177e4 | 348 | /* |
67ba4152 IM |
349 | * This should be easy, if there is something there we |
350 | * return it, otherwise we block. | |
1da177e4 LT |
351 | */ |
352 | ||
1b784140 | 353 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
354 | int noblock, int flags, int *addr_len) |
355 | { | |
356 | struct ipv6_pinfo *np = inet6_sk(sk); | |
357 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 358 | struct sk_buff *skb; |
59c2cdae | 359 | unsigned int ulen, copied; |
3f518bf7 | 360 | int peeked, off = 0; |
759e5d00 HX |
361 | int err; |
362 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 363 | bool checksum_valid = false; |
f26ba175 | 364 | int is_udp4; |
8a74ad60 | 365 | bool slow; |
1da177e4 | 366 | |
1da177e4 | 367 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 368 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 369 | |
4b340ae2 | 370 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 371 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 372 | |
1da177e4 | 373 | try_again: |
a59322be | 374 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 375 | &peeked, &off, &err); |
1da177e4 LT |
376 | if (!skb) |
377 | goto out; | |
378 | ||
759e5d00 | 379 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
380 | copied = len; |
381 | if (copied > ulen) | |
382 | copied = ulen; | |
383 | else if (copied < ulen) | |
1ab1457c | 384 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 385 | |
f26ba175 WY |
386 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
387 | ||
ba4e58ec | 388 | /* |
759e5d00 HX |
389 | * If checksum is needed at all, try to do it while copying the |
390 | * data. If the data is truncated, or if we only want a partial | |
391 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 392 | */ |
ba4e58ec | 393 | |
59c2cdae | 394 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
197c949e ED |
395 | checksum_valid = !udp_lib_checksum_complete(skb); |
396 | if (!checksum_valid) | |
1da177e4 | 397 | goto csum_copy_err; |
ba4e58ec GR |
398 | } |
399 | ||
197c949e | 400 | if (checksum_valid || skb_csum_unnecessary(skb)) |
51f3d02b DM |
401 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
402 | msg, copied); | |
ba4e58ec | 403 | else { |
227158db | 404 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg); |
1da177e4 LT |
405 | if (err == -EINVAL) |
406 | goto csum_copy_err; | |
407 | } | |
22911fc5 ED |
408 | if (unlikely(err)) { |
409 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
410 | if (!peeked) { |
411 | atomic_inc(&sk->sk_drops); | |
412 | if (is_udp4) | |
413 | UDP_INC_STATS_USER(sock_net(sk), | |
414 | UDP_MIB_INERRORS, | |
415 | is_udplite); | |
416 | else | |
417 | UDP6_INC_STATS_USER(sock_net(sk), | |
418 | UDP_MIB_INERRORS, | |
419 | is_udplite); | |
420 | } | |
1da177e4 | 421 | goto out_free; |
22911fc5 | 422 | } |
f26ba175 WY |
423 | if (!peeked) { |
424 | if (is_udp4) | |
425 | UDP_INC_STATS_USER(sock_net(sk), | |
426 | UDP_MIB_INDATAGRAMS, is_udplite); | |
427 | else | |
428 | UDP6_INC_STATS_USER(sock_net(sk), | |
429 | UDP_MIB_INDATAGRAMS, is_udplite); | |
430 | } | |
cb75994e | 431 | |
3b885787 | 432 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
433 | |
434 | /* Copy the address. */ | |
435 | if (msg->msg_name) { | |
342dfc30 | 436 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 437 | sin6->sin6_family = AF_INET6; |
4bedb452 | 438 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 439 | sin6->sin6_flowinfo = 0; |
1da177e4 | 440 | |
842df073 | 441 | if (is_udp4) { |
b301e82c BH |
442 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
443 | &sin6->sin6_addr); | |
842df073 HFS |
444 | sin6->sin6_scope_id = 0; |
445 | } else { | |
4e3fd7a0 | 446 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
447 | sin6->sin6_scope_id = |
448 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 449 | inet6_iif(skb)); |
1da177e4 | 450 | } |
bceaa902 | 451 | *addr_len = sizeof(*sin6); |
1da177e4 | 452 | } |
4b261c75 HFS |
453 | |
454 | if (np->rxopt.all) | |
455 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
456 | ||
f26ba175 | 457 | if (is_udp4) { |
1da177e4 LT |
458 | if (inet->cmsg_flags) |
459 | ip_cmsg_recv(msg, skb); | |
460 | } else { | |
461 | if (np->rxopt.all) | |
4b261c75 | 462 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 463 | } |
1da177e4 | 464 | |
59c2cdae | 465 | err = copied; |
1da177e4 | 466 | if (flags & MSG_TRUNC) |
759e5d00 | 467 | err = ulen; |
1da177e4 LT |
468 | |
469 | out_free: | |
9d410c79 | 470 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
471 | out: |
472 | return err; | |
473 | ||
474 | csum_copy_err: | |
8a74ad60 | 475 | slow = lock_sock_fast(sk); |
0856f939 | 476 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
477 | if (is_udp4) { |
478 | UDP_INC_STATS_USER(sock_net(sk), | |
479 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
480 | UDP_INC_STATS_USER(sock_net(sk), |
481 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
482 | } else { |
483 | UDP6_INC_STATS_USER(sock_net(sk), | |
484 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
485 | UDP6_INC_STATS_USER(sock_net(sk), |
486 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 487 | } |
0856f939 | 488 | } |
8a74ad60 | 489 | unlock_sock_fast(sk, slow); |
1da177e4 | 490 | |
beb39db5 ED |
491 | /* starting over for a new packet, but check if we need to yield */ |
492 | cond_resched(); | |
9cfaa8de | 493 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
494 | goto try_again; |
495 | } | |
496 | ||
ba4e58ec | 497 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 498 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 499 | struct udp_table *udptable) |
1da177e4 LT |
500 | { |
501 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
502 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
503 | const struct in6_addr *saddr = &hdr->saddr; | |
504 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 505 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 506 | struct sock *sk; |
e0d8c1b7 | 507 | int harderr; |
1da177e4 | 508 | int err; |
7304fe46 | 509 | struct net *net = dev_net(skb->dev); |
1da177e4 | 510 | |
e32ea7e7 | 511 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 512 | inet6_iif(skb), udptable, skb); |
63159f29 | 513 | if (!sk) { |
7304fe46 DJ |
514 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
515 | ICMP6_MIB_INERRORS); | |
1da177e4 | 516 | return; |
7304fe46 | 517 | } |
1da177e4 | 518 | |
e0d8c1b7 WW |
519 | harderr = icmpv6_err_convert(type, code, &err); |
520 | np = inet6_sk(sk); | |
521 | ||
93b36cf3 HFS |
522 | if (type == ICMPV6_PKT_TOOBIG) { |
523 | if (!ip6_sk_accept_pmtu(sk)) | |
524 | goto out; | |
81aded24 | 525 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
526 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
527 | harderr = 1; | |
93b36cf3 | 528 | } |
1a462d18 | 529 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 530 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
531 | goto out; |
532 | } | |
81aded24 | 533 | |
e0d8c1b7 WW |
534 | if (!np->recverr) { |
535 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
536 | goto out; | |
537 | } else { | |
1da177e4 | 538 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 539 | } |
b1faf566 | 540 | |
1da177e4 LT |
541 | sk->sk_err = err; |
542 | sk->sk_error_report(sk); | |
543 | out: | |
ca065d0c | 544 | return; |
1da177e4 LT |
545 | } |
546 | ||
f7ad74fe BL |
547 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
548 | { | |
549 | int rc; | |
550 | ||
efe4208f | 551 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 552 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 553 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 554 | sk_incoming_cpu_update(sk); |
005ec974 | 555 | } |
f7ad74fe BL |
556 | |
557 | rc = sock_queue_rcv_skb(sk, skb); | |
558 | if (rc < 0) { | |
559 | int is_udplite = IS_UDPLITE(sk); | |
560 | ||
561 | /* Note that an ENOMEM error is charged twice */ | |
562 | if (rc == -ENOMEM) | |
563 | UDP6_INC_STATS_BH(sock_net(sk), | |
564 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
565 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
566 | kfree_skb(skb); | |
567 | return -1; | |
568 | } | |
569 | return 0; | |
570 | } | |
571 | ||
ba4e58ec | 572 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 573 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 574 | u8 code, int offset, __be32 info) |
ba4e58ec | 575 | { |
645ca708 | 576 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
577 | } |
578 | ||
d7f3f621 BL |
579 | static struct static_key udpv6_encap_needed __read_mostly; |
580 | void udpv6_encap_enable(void) | |
581 | { | |
582 | if (!static_key_enabled(&udpv6_encap_needed)) | |
583 | static_key_slow_inc(&udpv6_encap_needed); | |
584 | } | |
585 | EXPORT_SYMBOL(udpv6_encap_enable); | |
586 | ||
f7ad74fe | 587 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 588 | { |
ba4e58ec | 589 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 590 | int rc; |
b2bf1e26 | 591 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 592 | |
ba4e58ec GR |
593 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
594 | goto drop; | |
1da177e4 | 595 | |
d7f3f621 BL |
596 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
597 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
598 | ||
599 | /* | |
600 | * This is an encapsulation socket so pass the skb to | |
601 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
602 | * fall through and pass this up the UDP socket. | |
603 | * up->encap_rcv() returns the following value: | |
604 | * =0 if skb was successfully passed to the encap | |
605 | * handler or was discarded by it. | |
606 | * >0 if skb should be passed on to UDP. | |
607 | * <0 if skb should be resubmitted as proto -N | |
608 | */ | |
609 | ||
610 | /* if we're overly short, let UDP handle it */ | |
611 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 612 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
613 | int ret; |
614 | ||
0a80966b TH |
615 | /* Verify checksum before giving to encap */ |
616 | if (udp_lib_checksum_complete(skb)) | |
617 | goto csum_error; | |
618 | ||
d7f3f621 BL |
619 | ret = encap_rcv(sk, skb); |
620 | if (ret <= 0) { | |
621 | UDP_INC_STATS_BH(sock_net(sk), | |
622 | UDP_MIB_INDATAGRAMS, | |
623 | is_udplite); | |
624 | return -ret; | |
625 | } | |
626 | } | |
627 | ||
628 | /* FALLTHROUGH -- it's a UDP Packet */ | |
629 | } | |
630 | ||
ba4e58ec GR |
631 | /* |
632 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
633 | */ | |
b2bf1e26 | 634 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
635 | |
636 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
637 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
638 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
639 | goto drop; |
640 | } | |
641 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
642 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
643 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
644 | goto drop; |
645 | } | |
1da177e4 LT |
646 | } |
647 | ||
33d480ce | 648 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 649 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 650 | goto csum_error; |
1ab6eb62 | 651 | } |
ba4e58ec | 652 | |
274f482d | 653 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
3e215c8d JL |
654 | UDP6_INC_STATS_BH(sock_net(sk), |
655 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 656 | goto drop; |
3e215c8d | 657 | } |
cb80ef46 | 658 | |
d826eb14 | 659 | skb_dst_drop(skb); |
cb75994e | 660 | |
cb80ef46 BL |
661 | bh_lock_sock(sk); |
662 | rc = 0; | |
663 | if (!sock_owned_by_user(sk)) | |
664 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
665 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
666 | bh_unlock_sock(sk); | |
667 | goto drop; | |
668 | } | |
669 | bh_unlock_sock(sk); | |
f7ad74fe BL |
670 | |
671 | return rc; | |
3e215c8d | 672 | |
6a5dc9e5 ED |
673 | csum_error: |
674 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 675 | drop: |
ef28d1a2 | 676 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 677 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
678 | kfree_skb(skb); |
679 | return -1; | |
1da177e4 LT |
680 | } |
681 | ||
5cf3d461 DH |
682 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
683 | __be16 loc_port, const struct in6_addr *loc_addr, | |
684 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
685 | int dif, unsigned short hnum) | |
1da177e4 | 686 | { |
5cf3d461 | 687 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 688 | |
5cf3d461 DH |
689 | if (!net_eq(sock_net(sk), net)) |
690 | return false; | |
691 | ||
692 | if (udp_sk(sk)->udp_port_hash != hnum || | |
693 | sk->sk_family != PF_INET6 || | |
694 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
695 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
696 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
697 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
698 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
699 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
700 | return false; |
701 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
702 | return false; | |
703 | return true; | |
1da177e4 LT |
704 | } |
705 | ||
4068579e TH |
706 | static void udp6_csum_zero_error(struct sk_buff *skb) |
707 | { | |
708 | /* RFC 2460 section 8.1 says that we SHOULD log | |
709 | * this error. Well, it is reasonable. | |
710 | */ | |
ba7a46f1 JP |
711 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
712 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
713 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
714 | } |
715 | ||
1da177e4 LT |
716 | /* |
717 | * Note: called only from the BH handler context, | |
718 | * so we don't need to lock the hashes. | |
719 | */ | |
e3163493 | 720 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 721 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 722 | struct udp_table *udptable, int proto) |
1da177e4 | 723 | { |
ca065d0c | 724 | struct sock *sk, *first = NULL; |
4bedb452 | 725 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
726 | unsigned short hnum = ntohs(uh->dest); |
727 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 728 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 729 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
730 | int dif = inet6_iif(skb); |
731 | struct hlist_node *node; | |
732 | struct sk_buff *nskb; | |
2dc41cff DH |
733 | |
734 | if (use_hash2) { | |
735 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
736 | udp_table.mask; | |
737 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
738 | start_lookup: | |
739 | hslot = &udp_table.hash2[hash2]; | |
740 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
741 | } | |
1da177e4 | 742 | |
ca065d0c ED |
743 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
744 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
745 | uh->source, saddr, dif, hnum)) | |
746 | continue; | |
747 | /* If zero checksum and no_check is not on for | |
748 | * the socket then skip it. | |
749 | */ | |
750 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
751 | continue; | |
752 | if (!first) { | |
753 | first = sk; | |
754 | continue; | |
755 | } | |
756 | nskb = skb_clone(skb, GFP_ATOMIC); | |
757 | if (unlikely(!nskb)) { | |
758 | atomic_inc(&sk->sk_drops); | |
759 | UDP6_INC_STATS_BH(net, UDP_MIB_RCVBUFERRORS, | |
760 | IS_UDPLITE(sk)); | |
761 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, | |
762 | IS_UDPLITE(sk)); | |
763 | continue; | |
95766fff | 764 | } |
a1ab77f9 | 765 | |
ca065d0c ED |
766 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
767 | consume_skb(nskb); | |
768 | } | |
a1ab77f9 | 769 | |
2dc41cff DH |
770 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
771 | if (use_hash2 && hash2 != hash2_any) { | |
772 | hash2 = hash2_any; | |
773 | goto start_lookup; | |
774 | } | |
775 | ||
ca065d0c ED |
776 | if (first) { |
777 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
778 | consume_skb(skb); | |
a1ab77f9 | 779 | } else { |
ca065d0c ED |
780 | kfree_skb(skb); |
781 | UDP6_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, | |
782 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 783 | } |
ba4e58ec | 784 | return 0; |
1da177e4 LT |
785 | } |
786 | ||
645ca708 | 787 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 788 | int proto) |
1da177e4 | 789 | { |
ca065d0c | 790 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 791 | struct net *net = dev_net(skb->dev); |
1ab1457c | 792 | struct udphdr *uh; |
ca065d0c | 793 | struct sock *sk; |
1da177e4 LT |
794 | u32 ulen = 0; |
795 | ||
796 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 797 | goto discard; |
1da177e4 | 798 | |
0660e03f ACM |
799 | saddr = &ipv6_hdr(skb)->saddr; |
800 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 801 | uh = udp_hdr(skb); |
1da177e4 LT |
802 | |
803 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
804 | if (ulen > skb->len) |
805 | goto short_packet; | |
1da177e4 | 806 | |
759e5d00 HX |
807 | if (proto == IPPROTO_UDP) { |
808 | /* UDP validates ulen. */ | |
1da177e4 | 809 | |
ba4e58ec GR |
810 | /* Check for jumbo payload */ |
811 | if (ulen == 0) | |
812 | ulen = skb->len; | |
1da177e4 | 813 | |
ba4e58ec GR |
814 | if (ulen < sizeof(*uh)) |
815 | goto short_packet; | |
1da177e4 | 816 | |
ba4e58ec GR |
817 | if (ulen < skb->len) { |
818 | if (pskb_trim_rcsum(skb, ulen)) | |
819 | goto short_packet; | |
0660e03f ACM |
820 | saddr = &ipv6_hdr(skb)->saddr; |
821 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 822 | uh = udp_hdr(skb); |
ba4e58ec | 823 | } |
ba4e58ec | 824 | } |
1da177e4 | 825 | |
759e5d00 | 826 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 827 | goto csum_error; |
759e5d00 | 828 | |
1ab1457c YH |
829 | /* |
830 | * Multicast receive code | |
1da177e4 | 831 | */ |
ba4e58ec | 832 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 833 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 834 | saddr, daddr, udptable, proto); |
1da177e4 LT |
835 | |
836 | /* Unicast */ | |
837 | ||
1ab1457c | 838 | /* |
1da177e4 LT |
839 | * check socket cache ... must talk to Alan about his plans |
840 | * for sock caches... i'll skip this for now. | |
841 | */ | |
607c4aaf | 842 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 843 | if (sk) { |
a5b50476 ET |
844 | int ret; |
845 | ||
1c19448c | 846 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
4068579e TH |
847 | udp6_csum_zero_error(skb); |
848 | goto csum_error; | |
849 | } | |
850 | ||
224d019c | 851 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
852 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
853 | ip6_compute_pseudo); | |
854 | ||
a5b50476 | 855 | ret = udpv6_queue_rcv_skb(sk, skb); |
1da177e4 | 856 | |
59dca1d8 | 857 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 858 | if (ret > 0) |
59dca1d8 | 859 | return ret; |
1da177e4 | 860 | |
add459aa | 861 | return 0; |
1da177e4 | 862 | } |
1ab1457c | 863 | |
4068579e TH |
864 | if (!uh->check) { |
865 | udp6_csum_zero_error(skb); | |
866 | goto csum_error; | |
867 | } | |
868 | ||
cb80ef46 | 869 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 870 | goto discard; |
cb80ef46 BL |
871 | |
872 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 873 | goto csum_error; |
cb80ef46 BL |
874 | |
875 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
876 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
877 | ||
878 | kfree_skb(skb); | |
add459aa | 879 | return 0; |
1da177e4 | 880 | |
1ab1457c | 881 | short_packet: |
ba7a46f1 JP |
882 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
883 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
884 | saddr, ntohs(uh->source), | |
885 | ulen, skb->len, | |
886 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
887 | goto discard; |
888 | csum_error: | |
889 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 890 | discard: |
ef28d1a2 | 891 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 892 | kfree_skb(skb); |
add459aa | 893 | return 0; |
1da177e4 | 894 | } |
ba4e58ec | 895 | |
e5bbef20 | 896 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 897 | { |
645ca708 | 898 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
899 | } |
900 | ||
1da177e4 LT |
901 | /* |
902 | * Throw away all pending data and cancel the corking. Socket is locked. | |
903 | */ | |
904 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
905 | { | |
906 | struct udp_sock *up = udp_sk(sk); | |
907 | ||
36d926b9 DL |
908 | if (up->pending == AF_INET) |
909 | udp_flush_pending_frames(sk); | |
910 | else if (up->pending) { | |
1da177e4 LT |
911 | up->len = 0; |
912 | up->pending = 0; | |
913 | ip6_flush_pending_frames(sk); | |
1ab1457c | 914 | } |
1da177e4 LT |
915 | } |
916 | ||
493c6be3 | 917 | /** |
67ba4152 IM |
918 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
919 | * @sk: socket we are sending on | |
920 | * @skb: sk_buff containing the filled-in UDP header | |
921 | * (checksum field must be zeroed out) | |
493c6be3 SS |
922 | */ |
923 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
924 | const struct in6_addr *saddr, | |
925 | const struct in6_addr *daddr, int len) | |
926 | { | |
927 | unsigned int offset; | |
928 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 929 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
930 | __wsum csum = 0; |
931 | ||
d39d938c | 932 | if (!frags) { |
493c6be3 SS |
933 | /* Only one fragment on the socket. */ |
934 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
935 | skb->csum_offset = offsetof(struct udphdr, check); | |
936 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
937 | } else { | |
938 | /* | |
939 | * HW-checksum won't work as there are two or more | |
940 | * fragments on the socket so that all csums of sk_buffs | |
941 | * should be together | |
942 | */ | |
943 | offset = skb_transport_offset(skb); | |
944 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
945 | ||
946 | skb->ip_summed = CHECKSUM_NONE; | |
947 | ||
d39d938c VY |
948 | do { |
949 | csum = csum_add(csum, frags->csum); | |
950 | } while ((frags = frags->next)); | |
493c6be3 SS |
951 | |
952 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
953 | csum); | |
954 | if (uh->check == 0) | |
955 | uh->check = CSUM_MANGLED_0; | |
956 | } | |
957 | } | |
958 | ||
1da177e4 LT |
959 | /* |
960 | * Sending | |
961 | */ | |
962 | ||
d39d938c | 963 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 964 | { |
d39d938c | 965 | struct sock *sk = skb->sk; |
1da177e4 | 966 | struct udphdr *uh; |
1da177e4 | 967 | int err = 0; |
b2bf1e26 | 968 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 969 | __wsum csum = 0; |
d39d938c VY |
970 | int offset = skb_transport_offset(skb); |
971 | int len = skb->len - offset; | |
1da177e4 LT |
972 | |
973 | /* | |
974 | * Create a UDP header | |
975 | */ | |
4bedb452 | 976 | uh = udp_hdr(skb); |
1958b856 DM |
977 | uh->source = fl6->fl6_sport; |
978 | uh->dest = fl6->fl6_dport; | |
d39d938c | 979 | uh->len = htons(len); |
1da177e4 LT |
980 | uh->check = 0; |
981 | ||
b2bf1e26 | 982 | if (is_udplite) |
d39d938c VY |
983 | csum = udplite_csum(skb); |
984 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
985 | skb->ip_summed = CHECKSUM_NONE; |
986 | goto send; | |
987 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 988 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
989 | goto send; |
990 | } else | |
d39d938c | 991 | csum = udp_csum(skb); |
1da177e4 | 992 | |
ba4e58ec | 993 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 994 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 995 | len, fl6->flowi6_proto, csum); |
1da177e4 | 996 | if (uh->check == 0) |
f6ab0288 | 997 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 998 | |
493c6be3 | 999 | send: |
d39d938c | 1000 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1001 | if (err) { |
1002 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1003 | UDP6_INC_STATS_USER(sock_net(sk), | |
1004 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1005 | err = 0; | |
1006 | } | |
1007 | } else | |
1008 | UDP6_INC_STATS_USER(sock_net(sk), | |
1009 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
d39d938c VY |
1010 | return err; |
1011 | } | |
1012 | ||
1013 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1014 | { | |
1015 | struct sk_buff *skb; | |
1016 | struct udp_sock *up = udp_sk(sk); | |
1017 | struct flowi6 fl6; | |
1018 | int err = 0; | |
1019 | ||
1020 | if (up->pending == AF_INET) | |
1021 | return udp_push_pending_frames(sk); | |
1022 | ||
1023 | /* ip6_finish_skb will release the cork, so make a copy of | |
1024 | * fl6 here. | |
1025 | */ | |
1026 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1027 | ||
1028 | skb = ip6_finish_skb(sk); | |
1029 | if (!skb) | |
1030 | goto out; | |
1031 | ||
1032 | err = udp_v6_send_skb(skb, &fl6); | |
1033 | ||
1da177e4 LT |
1034 | out: |
1035 | up->len = 0; | |
1036 | up->pending = 0; | |
1037 | return err; | |
1038 | } | |
1039 | ||
1b784140 | 1040 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1041 | { |
1042 | struct ipv6_txoptions opt_space; | |
1043 | struct udp_sock *up = udp_sk(sk); | |
1044 | struct inet_sock *inet = inet_sk(sk); | |
1045 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1046 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1047 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1048 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1049 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1050 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1051 | struct flowi6 fl6; |
1da177e4 LT |
1052 | struct dst_entry *dst; |
1053 | int addr_len = msg->msg_namelen; | |
1054 | int ulen = len; | |
1055 | int hlimit = -1; | |
41a1f8ea | 1056 | int tclass = -1; |
13b52cd4 | 1057 | int dontfrag = -1; |
1da177e4 LT |
1058 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1059 | int err; | |
987905de | 1060 | int connected = 0; |
b2bf1e26 | 1061 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1062 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
ad1e46a8 | 1063 | struct sockcm_cookie sockc; |
1da177e4 LT |
1064 | |
1065 | /* destination address check */ | |
1066 | if (sin6) { | |
1067 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1068 | return -EINVAL; | |
1069 | ||
1070 | switch (sin6->sin6_family) { | |
1071 | case AF_INET6: | |
1072 | if (addr_len < SIN6_LEN_RFC2133) | |
1073 | return -EINVAL; | |
1074 | daddr = &sin6->sin6_addr; | |
1075 | break; | |
1076 | case AF_INET: | |
1077 | goto do_udp_sendmsg; | |
1078 | case AF_UNSPEC: | |
1079 | msg->msg_name = sin6 = NULL; | |
1080 | msg->msg_namelen = addr_len = 0; | |
1081 | daddr = NULL; | |
1082 | break; | |
1083 | default: | |
1084 | return -EINVAL; | |
1085 | } | |
1086 | } else if (!up->pending) { | |
1087 | if (sk->sk_state != TCP_ESTABLISHED) | |
1088 | return -EDESTADDRREQ; | |
efe4208f | 1089 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1090 | } else |
1da177e4 LT |
1091 | daddr = NULL; |
1092 | ||
1093 | if (daddr) { | |
e773e4fa | 1094 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1095 | struct sockaddr_in sin; |
1096 | sin.sin_family = AF_INET; | |
c720c7e8 | 1097 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1098 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1099 | msg->msg_name = &sin; | |
1100 | msg->msg_namelen = sizeof(sin); | |
1101 | do_udp_sendmsg: | |
1102 | if (__ipv6_only_sock(sk)) | |
1103 | return -ENETUNREACH; | |
1b784140 | 1104 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1105 | } |
1106 | } | |
1107 | ||
1108 | if (up->pending == AF_INET) | |
1b784140 | 1109 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1110 | |
1111 | /* Rough check on arithmetic overflow, | |
b59e139b | 1112 | better check is made in ip6_append_data(). |
1da177e4 LT |
1113 | */ |
1114 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1115 | return -EMSGSIZE; | |
1ab1457c | 1116 | |
03485f2a | 1117 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1118 | if (up->pending) { |
1119 | /* | |
1120 | * There are pending frames. | |
1121 | * The socket lock must be held while it's corked. | |
1122 | */ | |
1123 | lock_sock(sk); | |
1124 | if (likely(up->pending)) { | |
1125 | if (unlikely(up->pending != AF_INET6)) { | |
1126 | release_sock(sk); | |
1127 | return -EAFNOSUPPORT; | |
1128 | } | |
1129 | dst = NULL; | |
1130 | goto do_append_data; | |
1131 | } | |
1132 | release_sock(sk); | |
1133 | } | |
1134 | ulen += sizeof(struct udphdr); | |
1135 | ||
4c9483b2 | 1136 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1137 | |
1138 | if (sin6) { | |
1139 | if (sin6->sin6_port == 0) | |
1140 | return -EINVAL; | |
1141 | ||
1958b856 | 1142 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1143 | daddr = &sin6->sin6_addr; |
1144 | ||
1145 | if (np->sndflow) { | |
4c9483b2 DM |
1146 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1147 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1148 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1149 | if (!flowlabel) |
1da177e4 | 1150 | return -EINVAL; |
1da177e4 LT |
1151 | } |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Otherwise it will be difficult to maintain | |
1156 | * sk->sk_dst_cache. | |
1157 | */ | |
1158 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1159 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1160 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1161 | |
1162 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1163 | sin6->sin6_scope_id && | |
842df073 | 1164 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1165 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1166 | } else { |
1167 | if (sk->sk_state != TCP_ESTABLISHED) | |
1168 | return -EDESTADDRREQ; | |
1169 | ||
1958b856 | 1170 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1171 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1172 | fl6.flowlabel = np->flow_label; |
987905de | 1173 | connected = 1; |
1da177e4 LT |
1174 | } |
1175 | ||
4c9483b2 DM |
1176 | if (!fl6.flowi6_oif) |
1177 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1178 | |
4c9483b2 DM |
1179 | if (!fl6.flowi6_oif) |
1180 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1181 | |
4c9483b2 | 1182 | fl6.flowi6_mark = sk->sk_mark; |
c14ac945 | 1183 | sockc.tsflags = sk->sk_tsflags; |
51953d5b | 1184 | |
1da177e4 LT |
1185 | if (msg->msg_controllen) { |
1186 | opt = &opt_space; | |
1187 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1188 | opt->tot_len = sizeof(*opt); | |
1189 | ||
73df66f8 | 1190 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
ad1e46a8 SHY |
1191 | &hlimit, &tclass, &dontfrag, |
1192 | &sockc); | |
1da177e4 LT |
1193 | if (err < 0) { |
1194 | fl6_sock_release(flowlabel); | |
1195 | return err; | |
1196 | } | |
4c9483b2 DM |
1197 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1198 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1199 | if (!flowlabel) |
1da177e4 LT |
1200 | return -EINVAL; |
1201 | } | |
1202 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1203 | opt = NULL; | |
987905de | 1204 | connected = 0; |
1da177e4 | 1205 | } |
45f6fad8 ED |
1206 | if (!opt) { |
1207 | opt = txopt_get(np); | |
1208 | opt_to_free = opt; | |
1209 | } | |
df9890c3 YH |
1210 | if (flowlabel) |
1211 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1212 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1213 | |
4c9483b2 | 1214 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1215 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1216 | fl6.daddr = *daddr; |
876c7f41 | 1217 | else |
4c9483b2 DM |
1218 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1219 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1220 | fl6.saddr = np->saddr; |
1958b856 | 1221 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1222 | |
4c9483b2 | 1223 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1224 | if (final_p) |
987905de | 1225 | connected = 0; |
1da177e4 | 1226 | |
4c9483b2 DM |
1227 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1228 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1229 | connected = 0; |
c4062dfc EH |
1230 | } else if (!fl6.flowi6_oif) |
1231 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1232 | |
4c9483b2 | 1233 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1234 | |
0e0d44ab | 1235 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1236 | if (IS_ERR(dst)) { |
1237 | err = PTR_ERR(dst); | |
1238 | dst = NULL; | |
1da177e4 | 1239 | goto out; |
14e50e57 | 1240 | } |
1da177e4 | 1241 | |
5c98631c LC |
1242 | if (hlimit < 0) |
1243 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1244 | |
e651f03a | 1245 | if (tclass < 0) |
41a1f8ea | 1246 | tclass = np->tclass; |
41a1f8ea | 1247 | |
1da177e4 LT |
1248 | if (msg->msg_flags&MSG_CONFIRM) |
1249 | goto do_confirm; | |
1250 | back_from_confirm: | |
1251 | ||
03485f2a VY |
1252 | /* Lockless fast path for the non-corking case */ |
1253 | if (!corkreq) { | |
1254 | struct sk_buff *skb; | |
1255 | ||
1256 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
1257 | sizeof(struct udphdr), hlimit, tclass, opt, | |
1258 | &fl6, (struct rt6_info *)dst, | |
c14ac945 | 1259 | msg->msg_flags, dontfrag, &sockc); |
03485f2a VY |
1260 | err = PTR_ERR(skb); |
1261 | if (!IS_ERR_OR_NULL(skb)) | |
1262 | err = udp_v6_send_skb(skb, &fl6); | |
1263 | goto release_dst; | |
1264 | } | |
1265 | ||
1da177e4 LT |
1266 | lock_sock(sk); |
1267 | if (unlikely(up->pending)) { | |
1268 | /* The socket is already corked while preparing it. */ | |
1269 | /* ... which is an evident application bug. --ANK */ | |
1270 | release_sock(sk); | |
1271 | ||
ba7a46f1 | 1272 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1273 | err = -EINVAL; |
1274 | goto out; | |
1275 | } | |
1276 | ||
1277 | up->pending = AF_INET6; | |
1278 | ||
1279 | do_append_data: | |
e36d3ff9 JP |
1280 | if (dontfrag < 0) |
1281 | dontfrag = np->dontfrag; | |
1da177e4 | 1282 | up->len += ulen; |
f69e6d13 | 1283 | err = ip6_append_data(sk, getfrag, msg, ulen, |
4c9483b2 | 1284 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
67ba4152 | 1285 | (struct rt6_info *)dst, |
c14ac945 SHY |
1286 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag, |
1287 | &sockc); | |
1da177e4 LT |
1288 | if (err) |
1289 | udp_v6_flush_pending_frames(sk); | |
1290 | else if (!corkreq) | |
4c0a6cb0 | 1291 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1292 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1293 | up->pending = 0; | |
1da177e4 | 1294 | |
03485f2a VY |
1295 | if (err > 0) |
1296 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1297 | release_sock(sk); | |
1298 | ||
1299 | release_dst: | |
a5e7c210 DM |
1300 | if (dst) { |
1301 | if (connected) { | |
1302 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1303 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1304 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1305 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1306 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1307 | &np->saddr : |
1308 | #endif | |
1309 | NULL); | |
a5e7c210 DM |
1310 | } else { |
1311 | dst_release(dst); | |
1312 | } | |
a3c96089 | 1313 | dst = NULL; |
a5e7c210 DM |
1314 | } |
1315 | ||
1da177e4 | 1316 | out: |
a3c96089 | 1317 | dst_release(dst); |
1da177e4 | 1318 | fl6_sock_release(flowlabel); |
45f6fad8 | 1319 | txopt_put(opt_to_free); |
cd562c98 | 1320 | if (!err) |
1da177e4 | 1321 | return len; |
a18135eb DM |
1322 | /* |
1323 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1324 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1325 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1326 | * things). We could add another new stat but at least for now that | |
1327 | * seems like overkill. | |
1328 | */ | |
1329 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1330 | UDP6_INC_STATS_USER(sock_net(sk), |
1331 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1332 | } |
1da177e4 LT |
1333 | return err; |
1334 | ||
1335 | do_confirm: | |
1336 | dst_confirm(dst); | |
1337 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1338 | goto back_from_confirm; | |
1339 | err = 0; | |
1340 | goto out; | |
1341 | } | |
1342 | ||
7d06b2e0 | 1343 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1344 | { |
44046a59 | 1345 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1346 | lock_sock(sk); |
1347 | udp_v6_flush_pending_frames(sk); | |
1348 | release_sock(sk); | |
1349 | ||
44046a59 TP |
1350 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1351 | void (*encap_destroy)(struct sock *sk); | |
1352 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1353 | if (encap_destroy) | |
1354 | encap_destroy(sk); | |
1355 | } | |
1356 | ||
1da177e4 | 1357 | inet6_destroy_sock(sk); |
1da177e4 LT |
1358 | } |
1359 | ||
1360 | /* | |
1361 | * Socket option code for UDP | |
1362 | */ | |
ba4e58ec | 1363 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1364 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1365 | { |
db8dac20 | 1366 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1367 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1368 | udp_v6_push_pending_frames); | |
ba4e58ec | 1369 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1370 | } |
1371 | ||
1372 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1373 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1374 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1375 | { |
db8dac20 | 1376 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1377 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1378 | udp_v6_push_pending_frames); | |
ba4e58ec | 1379 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1380 | } |
1381 | #endif | |
1382 | ||
ba4e58ec GR |
1383 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1384 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1385 | { |
db8dac20 | 1386 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1387 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1388 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1389 | } |
1390 | ||
1391 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1392 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1393 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1394 | { |
db8dac20 | 1395 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1396 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1397 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1398 | } |
1399 | #endif | |
1400 | ||
41135cc8 | 1401 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1402 | .handler = udpv6_rcv, |
1403 | .err_handler = udpv6_err, | |
1404 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1405 | }; | |
1406 | ||
1407 | /* ------------------------------------------------------------------------ */ | |
1408 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1409 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1410 | { |
17ef66af LC |
1411 | if (v == SEQ_START_TOKEN) { |
1412 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1413 | } else { | |
1414 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1415 | struct inet_sock *inet = inet_sk(v); | |
1416 | __u16 srcp = ntohs(inet->inet_sport); | |
1417 | __u16 destp = ntohs(inet->inet_dport); | |
1418 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1419 | } | |
1da177e4 LT |
1420 | return 0; |
1421 | } | |
1422 | ||
73cb88ec AV |
1423 | static const struct file_operations udp6_afinfo_seq_fops = { |
1424 | .owner = THIS_MODULE, | |
1425 | .open = udp_seq_open, | |
1426 | .read = seq_read, | |
1427 | .llseek = seq_lseek, | |
1428 | .release = seq_release_net | |
1429 | }; | |
1430 | ||
1da177e4 | 1431 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1432 | .name = "udp6", |
1433 | .family = AF_INET6, | |
645ca708 | 1434 | .udp_table = &udp_table, |
73cb88ec | 1435 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1436 | .seq_ops = { |
1437 | .show = udp6_seq_show, | |
1438 | }, | |
1da177e4 LT |
1439 | }; |
1440 | ||
2c8c1e72 | 1441 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1442 | { |
0c96d8c5 | 1443 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1444 | } |
1445 | ||
ec120da6 IM |
1446 | void udp6_proc_exit(struct net *net) |
1447 | { | |
0c96d8c5 | 1448 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1449 | } |
1450 | #endif /* CONFIG_PROC_FS */ | |
1451 | ||
f77d6021 ED |
1452 | void udp_v6_clear_sk(struct sock *sk, int size) |
1453 | { | |
1454 | struct inet_sock *inet = inet_sk(sk); | |
1455 | ||
1456 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1457 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1458 | ||
1459 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1460 | memset(&inet->pinet6 + 1, 0, size); | |
1461 | } | |
1462 | ||
1da177e4 LT |
1463 | /* ------------------------------------------------------------------------ */ |
1464 | ||
1465 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1466 | .name = "UDPv6", |
1467 | .owner = THIS_MODULE, | |
ba4e58ec | 1468 | .close = udp_lib_close, |
543d9cfe ACM |
1469 | .connect = ip6_datagram_connect, |
1470 | .disconnect = udp_disconnect, | |
1471 | .ioctl = udp_ioctl, | |
1472 | .destroy = udpv6_destroy_sock, | |
1473 | .setsockopt = udpv6_setsockopt, | |
1474 | .getsockopt = udpv6_getsockopt, | |
1475 | .sendmsg = udpv6_sendmsg, | |
1476 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1477 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1478 | .hash = udp_lib_hash, |
1479 | .unhash = udp_lib_unhash, | |
719f8358 | 1480 | .rehash = udp_v6_rehash, |
543d9cfe | 1481 | .get_port = udp_v6_get_port, |
95766fff HA |
1482 | .memory_allocated = &udp_memory_allocated, |
1483 | .sysctl_mem = sysctl_udp_mem, | |
1484 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1485 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1486 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1487 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1488 | .h.udp_table = &udp_table, |
3fdadf7d | 1489 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1490 | .compat_setsockopt = compat_udpv6_setsockopt, |
1491 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1492 | #endif |
f77d6021 | 1493 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1494 | }; |
1495 | ||
1da177e4 LT |
1496 | static struct inet_protosw udpv6_protosw = { |
1497 | .type = SOCK_DGRAM, | |
1498 | .protocol = IPPROTO_UDP, | |
1499 | .prot = &udpv6_prot, | |
1500 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1501 | .flags = INET_PROTOSW_PERMANENT, |
1502 | }; | |
1503 | ||
7f4e4868 | 1504 | int __init udpv6_init(void) |
1da177e4 | 1505 | { |
7f4e4868 DL |
1506 | int ret; |
1507 | ||
3336288a VY |
1508 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1509 | if (ret) | |
c6b641a4 | 1510 | goto out; |
3336288a | 1511 | |
7f4e4868 DL |
1512 | ret = inet6_register_protosw(&udpv6_protosw); |
1513 | if (ret) | |
1514 | goto out_udpv6_protocol; | |
1515 | out: | |
1516 | return ret; | |
1517 | ||
1518 | out_udpv6_protocol: | |
1519 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1520 | goto out; | |
1521 | } | |
1522 | ||
09f7709f | 1523 | void udpv6_exit(void) |
7f4e4868 DL |
1524 | { |
1525 | inet6_unregister_protosw(&udpv6_protosw); | |
1526 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1527 | } |