Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | ||
1da177e4 LT |
40 | #include <net/ndisc.h> |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_route.h> | |
1da177e4 | 44 | #include <net/raw.h> |
c752f073 | 45 | #include <net/tcp_states.h> |
1da177e4 LT |
46 | #include <net/ip6_checksum.h> |
47 | #include <net/xfrm.h> | |
72289b96 | 48 | #include <net/inet6_hashtables.h> |
076bb0c8 | 49 | #include <net/busy_poll.h> |
1da177e4 LT |
50 | |
51 | #include <linux/proc_fs.h> | |
52 | #include <linux/seq_file.h> | |
22911fc5 | 53 | #include <trace/events/skb.h> |
ba4e58ec | 54 | #include "udp_impl.h" |
1da177e4 | 55 | |
b50026b5 HFS |
56 | static unsigned int udp6_ehashfn(struct net *net, |
57 | const struct in6_addr *laddr, | |
58 | const u16 lport, | |
59 | const struct in6_addr *faddr, | |
60 | const __be16 fport) | |
61 | { | |
1bbdceef HFS |
62 | static u32 udp6_ehash_secret __read_mostly; |
63 | static u32 udp_ipv6_hash_secret __read_mostly; | |
64 | ||
65 | u32 lhash, fhash; | |
66 | ||
67 | net_get_random_once(&udp6_ehash_secret, | |
68 | sizeof(udp6_ehash_secret)); | |
69 | net_get_random_once(&udp_ipv6_hash_secret, | |
70 | sizeof(udp_ipv6_hash_secret)); | |
71 | ||
72 | lhash = (__force u32)laddr->s6_addr32[3]; | |
73 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
74 | ||
b50026b5 | 75 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 76 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
77 | } |
78 | ||
b2f5e7cd VY |
79 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
80 | { | |
b2f5e7cd VY |
81 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); |
82 | int sk_ipv6only = ipv6_only_sock(sk); | |
83 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
efe4208f | 84 | int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); |
b2f5e7cd VY |
85 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
86 | ||
87 | /* if both are mapped, treat as IPv4 */ | |
88 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 | 89 | return (!sk2_ipv6only && |
50805466 ED |
90 | (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr || |
91 | sk->sk_rcv_saddr == sk2->sk_rcv_saddr)); | |
b2f5e7cd VY |
92 | |
93 | if (addr_type2 == IPV6_ADDR_ANY && | |
94 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
95 | return 1; | |
96 | ||
97 | if (addr_type == IPV6_ADDR_ANY && | |
98 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) | |
99 | return 1; | |
100 | ||
101 | if (sk2_rcv_saddr6 && | |
efe4208f | 102 | ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) |
b2f5e7cd VY |
103 | return 1; |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
d4cada4a ED |
108 | static unsigned int udp6_portaddr_hash(struct net *net, |
109 | const struct in6_addr *addr6, | |
110 | unsigned int port) | |
111 | { | |
112 | unsigned int hash, mix = net_hash_mix(net); | |
113 | ||
114 | if (ipv6_addr_any(addr6)) | |
115 | hash = jhash_1word(0, mix); | |
856540ee | 116 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 117 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 118 | else |
0eae88f3 | 119 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
120 | |
121 | return hash ^ port; | |
122 | } | |
123 | ||
124 | ||
6ba5a3c5 | 125 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 126 | { |
30fff923 ED |
127 | unsigned int hash2_nulladdr = |
128 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 129 | unsigned int hash2_partial = |
efe4208f | 130 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 131 | |
d4cada4a | 132 | /* precompute partial secondary hash */ |
30fff923 ED |
133 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
134 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
135 | } |
136 | ||
719f8358 ED |
137 | static void udp_v6_rehash(struct sock *sk) |
138 | { | |
139 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 140 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
141 | inet_sk(sk)->inet_num); |
142 | ||
143 | udp_lib_rehash(sk, new_hash); | |
144 | } | |
145 | ||
645ca708 ED |
146 | static inline int compute_score(struct sock *sk, struct net *net, |
147 | unsigned short hnum, | |
88440ae7 BS |
148 | const struct in6_addr *saddr, __be16 sport, |
149 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
150 | int dif) |
151 | { | |
152 | int score = -1; | |
153 | ||
d4cada4a | 154 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 | 155 | sk->sk_family == PF_INET6) { |
645ca708 ED |
156 | struct inet_sock *inet = inet_sk(sk); |
157 | ||
158 | score = 0; | |
c720c7e8 ED |
159 | if (inet->inet_dport) { |
160 | if (inet->inet_dport != sport) | |
645ca708 ED |
161 | return -1; |
162 | score++; | |
163 | } | |
efe4208f ED |
164 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
165 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
645ca708 ED |
166 | return -1; |
167 | score++; | |
168 | } | |
efe4208f ED |
169 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
170 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
645ca708 ED |
171 | return -1; |
172 | score++; | |
173 | } | |
174 | if (sk->sk_bound_dev_if) { | |
175 | if (sk->sk_bound_dev_if != dif) | |
176 | return -1; | |
177 | score++; | |
178 | } | |
179 | } | |
180 | return score; | |
181 | } | |
182 | ||
fddc17de ED |
183 | #define SCORE2_MAX (1 + 1 + 1) |
184 | static inline int compute_score2(struct sock *sk, struct net *net, | |
185 | const struct in6_addr *saddr, __be16 sport, | |
186 | const struct in6_addr *daddr, unsigned short hnum, | |
187 | int dif) | |
188 | { | |
189 | int score = -1; | |
190 | ||
191 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && | |
192 | sk->sk_family == PF_INET6) { | |
fddc17de ED |
193 | struct inet_sock *inet = inet_sk(sk); |
194 | ||
efe4208f | 195 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
fddc17de ED |
196 | return -1; |
197 | score = 0; | |
198 | if (inet->inet_dport) { | |
199 | if (inet->inet_dport != sport) | |
200 | return -1; | |
201 | score++; | |
202 | } | |
efe4208f ED |
203 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
204 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de ED |
205 | return -1; |
206 | score++; | |
207 | } | |
208 | if (sk->sk_bound_dev_if) { | |
209 | if (sk->sk_bound_dev_if != dif) | |
210 | return -1; | |
211 | score++; | |
212 | } | |
213 | } | |
214 | return score; | |
215 | } | |
216 | ||
fddc17de ED |
217 | |
218 | /* called with read_rcu_lock() */ | |
219 | static struct sock *udp6_lib_lookup2(struct net *net, | |
220 | const struct in6_addr *saddr, __be16 sport, | |
221 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
222 | struct udp_hslot *hslot2, unsigned int slot2) | |
223 | { | |
224 | struct sock *sk, *result; | |
225 | struct hlist_nulls_node *node; | |
72289b96 TH |
226 | int score, badness, matches = 0, reuseport = 0; |
227 | u32 hash = 0; | |
fddc17de ED |
228 | |
229 | begin: | |
230 | result = NULL; | |
231 | badness = -1; | |
232 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
233 | score = compute_score2(sk, net, saddr, sport, | |
234 | daddr, hnum, dif); | |
235 | if (score > badness) { | |
236 | result = sk; | |
237 | badness = score; | |
72289b96 TH |
238 | reuseport = sk->sk_reuseport; |
239 | if (reuseport) { | |
b50026b5 HFS |
240 | hash = udp6_ehashfn(net, daddr, hnum, |
241 | saddr, sport); | |
72289b96 TH |
242 | matches = 1; |
243 | } else if (score == SCORE2_MAX) | |
fddc17de | 244 | goto exact_match; |
72289b96 TH |
245 | } else if (score == badness && reuseport) { |
246 | matches++; | |
247 | if (((u64)hash * matches) >> 32 == 0) | |
248 | result = sk; | |
249 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
250 | } |
251 | } | |
252 | /* | |
253 | * if the nulls value we got at the end of this lookup is | |
254 | * not the expected one, we must restart lookup. | |
255 | * We probably met an item that was moved to another chain. | |
256 | */ | |
257 | if (get_nulls_value(node) != slot2) | |
258 | goto begin; | |
259 | ||
260 | if (result) { | |
261 | exact_match: | |
c31504dc | 262 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
263 | result = NULL; |
264 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
265 | daddr, hnum, dif) < badness)) { | |
266 | sock_put(result); | |
267 | goto begin; | |
268 | } | |
269 | } | |
270 | return result; | |
271 | } | |
272 | ||
fce82338 | 273 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
274 | const struct in6_addr *saddr, __be16 sport, |
275 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 | 276 | int dif, struct udp_table *udptable) |
1da177e4 | 277 | { |
271b72c7 | 278 | struct sock *sk, *result; |
88ab1932 | 279 | struct hlist_nulls_node *node; |
1da177e4 | 280 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
281 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
282 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 TH |
283 | int score, badness, matches = 0, reuseport = 0; |
284 | u32 hash = 0; | |
645ca708 | 285 | |
271b72c7 | 286 | rcu_read_lock(); |
fddc17de ED |
287 | if (hslot->count > 10) { |
288 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
289 | slot2 = hash2 & udptable->mask; | |
290 | hslot2 = &udptable->hash2[slot2]; | |
291 | if (hslot->count < hslot2->count) | |
292 | goto begin; | |
293 | ||
294 | result = udp6_lib_lookup2(net, saddr, sport, | |
295 | daddr, hnum, dif, | |
296 | hslot2, slot2); | |
297 | if (!result) { | |
298 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
299 | slot2 = hash2 & udptable->mask; | |
300 | hslot2 = &udptable->hash2[slot2]; | |
301 | if (hslot->count < hslot2->count) | |
302 | goto begin; | |
303 | ||
1223c67c JBD |
304 | result = udp6_lib_lookup2(net, saddr, sport, |
305 | &in6addr_any, hnum, dif, | |
fddc17de ED |
306 | hslot2, slot2); |
307 | } | |
308 | rcu_read_unlock(); | |
309 | return result; | |
310 | } | |
271b72c7 ED |
311 | begin: |
312 | result = NULL; | |
313 | badness = -1; | |
88ab1932 | 314 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
315 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
316 | if (score > badness) { | |
317 | result = sk; | |
318 | badness = score; | |
72289b96 TH |
319 | reuseport = sk->sk_reuseport; |
320 | if (reuseport) { | |
b50026b5 HFS |
321 | hash = udp6_ehashfn(net, daddr, hnum, |
322 | saddr, sport); | |
72289b96 TH |
323 | matches = 1; |
324 | } | |
325 | } else if (score == badness && reuseport) { | |
326 | matches++; | |
327 | if (((u64)hash * matches) >> 32 == 0) | |
328 | result = sk; | |
329 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
330 | } |
331 | } | |
88ab1932 ED |
332 | /* |
333 | * if the nulls value we got at the end of this lookup is | |
334 | * not the expected one, we must restart lookup. | |
335 | * We probably met an item that was moved to another chain. | |
336 | */ | |
fddc17de | 337 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
338 | goto begin; |
339 | ||
271b72c7 | 340 | if (result) { |
c31504dc | 341 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
342 | result = NULL; |
343 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
344 | daddr, dport, dif) < badness)) { | |
345 | sock_put(result); | |
346 | goto begin; | |
347 | } | |
348 | } | |
349 | rcu_read_unlock(); | |
1da177e4 LT |
350 | return result; |
351 | } | |
fce82338 | 352 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 353 | |
607c4aaf KK |
354 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
355 | __be16 sport, __be16 dport, | |
645ca708 | 356 | struct udp_table *udptable) |
607c4aaf | 357 | { |
23542618 | 358 | struct sock *sk; |
b71d1d42 | 359 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 360 | |
23542618 KK |
361 | if (unlikely(sk = skb_steal_sock(skb))) |
362 | return sk; | |
adf30907 ED |
363 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
364 | &iph->daddr, dport, inet6_iif(skb), | |
365 | udptable); | |
607c4aaf KK |
366 | } |
367 | ||
aa976fc0 BS |
368 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
369 | const struct in6_addr *daddr, __be16 dport, int dif) | |
370 | { | |
371 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
374 | ||
375 | ||
1da177e4 LT |
376 | /* |
377 | * This should be easy, if there is something there we | |
378 | * return it, otherwise we block. | |
379 | */ | |
380 | ||
ba4e58ec | 381 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
382 | struct msghdr *msg, size_t len, |
383 | int noblock, int flags, int *addr_len) | |
384 | { | |
385 | struct ipv6_pinfo *np = inet6_sk(sk); | |
386 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 387 | struct sk_buff *skb; |
59c2cdae | 388 | unsigned int ulen, copied; |
3f518bf7 | 389 | int peeked, off = 0; |
759e5d00 HX |
390 | int err; |
391 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 392 | int is_udp4; |
8a74ad60 | 393 | bool slow; |
1da177e4 | 394 | |
1da177e4 | 395 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 396 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 397 | |
4b340ae2 | 398 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 399 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 400 | |
1da177e4 | 401 | try_again: |
a59322be | 402 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 403 | &peeked, &off, &err); |
1da177e4 LT |
404 | if (!skb) |
405 | goto out; | |
406 | ||
759e5d00 | 407 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
408 | copied = len; |
409 | if (copied > ulen) | |
410 | copied = ulen; | |
411 | else if (copied < ulen) | |
1ab1457c | 412 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 413 | |
f26ba175 WY |
414 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
415 | ||
ba4e58ec | 416 | /* |
759e5d00 HX |
417 | * If checksum is needed at all, try to do it while copying the |
418 | * data. If the data is truncated, or if we only want a partial | |
419 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 420 | */ |
ba4e58ec | 421 | |
59c2cdae | 422 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
759e5d00 | 423 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 424 | goto csum_copy_err; |
ba4e58ec GR |
425 | } |
426 | ||
60476372 | 427 | if (skb_csum_unnecessary(skb)) |
ba4e58ec | 428 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
22911fc5 | 429 | msg->msg_iov, copied); |
ba4e58ec | 430 | else { |
1da177e4 LT |
431 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
432 | if (err == -EINVAL) | |
433 | goto csum_copy_err; | |
434 | } | |
22911fc5 ED |
435 | if (unlikely(err)) { |
436 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
437 | if (!peeked) { |
438 | atomic_inc(&sk->sk_drops); | |
439 | if (is_udp4) | |
440 | UDP_INC_STATS_USER(sock_net(sk), | |
441 | UDP_MIB_INERRORS, | |
442 | is_udplite); | |
443 | else | |
444 | UDP6_INC_STATS_USER(sock_net(sk), | |
445 | UDP_MIB_INERRORS, | |
446 | is_udplite); | |
447 | } | |
1da177e4 | 448 | goto out_free; |
22911fc5 | 449 | } |
f26ba175 WY |
450 | if (!peeked) { |
451 | if (is_udp4) | |
452 | UDP_INC_STATS_USER(sock_net(sk), | |
453 | UDP_MIB_INDATAGRAMS, is_udplite); | |
454 | else | |
455 | UDP6_INC_STATS_USER(sock_net(sk), | |
456 | UDP_MIB_INDATAGRAMS, is_udplite); | |
457 | } | |
cb75994e | 458 | |
3b885787 | 459 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
460 | |
461 | /* Copy the address. */ | |
462 | if (msg->msg_name) { | |
342dfc30 | 463 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 464 | sin6->sin6_family = AF_INET6; |
4bedb452 | 465 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 466 | sin6->sin6_flowinfo = 0; |
1da177e4 | 467 | |
842df073 | 468 | if (is_udp4) { |
b301e82c BH |
469 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
470 | &sin6->sin6_addr); | |
842df073 HFS |
471 | sin6->sin6_scope_id = 0; |
472 | } else { | |
4e3fd7a0 | 473 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
474 | sin6->sin6_scope_id = |
475 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
476 | IP6CB(skb)->iif); | |
1da177e4 | 477 | } |
bceaa902 | 478 | *addr_len = sizeof(*sin6); |
1da177e4 | 479 | } |
4b261c75 HFS |
480 | |
481 | if (np->rxopt.all) | |
482 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
483 | ||
f26ba175 | 484 | if (is_udp4) { |
1da177e4 LT |
485 | if (inet->cmsg_flags) |
486 | ip_cmsg_recv(msg, skb); | |
487 | } else { | |
488 | if (np->rxopt.all) | |
4b261c75 | 489 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 490 | } |
1da177e4 | 491 | |
59c2cdae | 492 | err = copied; |
1da177e4 | 493 | if (flags & MSG_TRUNC) |
759e5d00 | 494 | err = ulen; |
1da177e4 LT |
495 | |
496 | out_free: | |
9d410c79 | 497 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
498 | out: |
499 | return err; | |
500 | ||
501 | csum_copy_err: | |
8a74ad60 | 502 | slow = lock_sock_fast(sk); |
0856f939 | 503 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 ED |
504 | if (is_udp4) { |
505 | UDP_INC_STATS_USER(sock_net(sk), | |
506 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
507 | UDP_INC_STATS_USER(sock_net(sk), |
508 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 ED |
509 | } else { |
510 | UDP6_INC_STATS_USER(sock_net(sk), | |
511 | UDP_MIB_CSUMERRORS, is_udplite); | |
0856f939 WY |
512 | UDP6_INC_STATS_USER(sock_net(sk), |
513 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 514 | } |
0856f939 | 515 | } |
8a74ad60 | 516 | unlock_sock_fast(sk, slow); |
1da177e4 | 517 | |
32c90254 | 518 | if (noblock) |
1da177e4 | 519 | return -EAGAIN; |
9cfaa8de XZ |
520 | |
521 | /* starting over for a new packet */ | |
522 | msg->msg_flags &= ~MSG_TRUNC; | |
1da177e4 LT |
523 | goto try_again; |
524 | } | |
525 | ||
ba4e58ec | 526 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 527 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 528 | struct udp_table *udptable) |
1da177e4 LT |
529 | { |
530 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
531 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
532 | const struct in6_addr *saddr = &hdr->saddr; | |
533 | const struct in6_addr *daddr = &hdr->daddr; | |
1da177e4 LT |
534 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
535 | struct sock *sk; | |
536 | int err; | |
537 | ||
c346dca1 | 538 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 539 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
540 | if (sk == NULL) |
541 | return; | |
542 | ||
93b36cf3 HFS |
543 | if (type == ICMPV6_PKT_TOOBIG) { |
544 | if (!ip6_sk_accept_pmtu(sk)) | |
545 | goto out; | |
81aded24 | 546 | ip6_sk_update_pmtu(skb, sk, info); |
93b36cf3 | 547 | } |
1a462d18 | 548 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 549 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
550 | goto out; |
551 | } | |
81aded24 | 552 | |
1da177e4 LT |
553 | np = inet6_sk(sk); |
554 | ||
555 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
556 | goto out; | |
557 | ||
558 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
559 | goto out; | |
560 | ||
b1faf566 | 561 | if (np->recverr) |
1da177e4 | 562 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 563 | |
1da177e4 LT |
564 | sk->sk_err = err; |
565 | sk->sk_error_report(sk); | |
566 | out: | |
567 | sock_put(sk); | |
568 | } | |
569 | ||
f7ad74fe BL |
570 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
571 | { | |
572 | int rc; | |
573 | ||
efe4208f | 574 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 575 | sock_rps_save_rxhash(sk, skb); |
005ec974 SB |
576 | sk_mark_napi_id(sk, skb); |
577 | } | |
f7ad74fe BL |
578 | |
579 | rc = sock_queue_rcv_skb(sk, skb); | |
580 | if (rc < 0) { | |
581 | int is_udplite = IS_UDPLITE(sk); | |
582 | ||
583 | /* Note that an ENOMEM error is charged twice */ | |
584 | if (rc == -ENOMEM) | |
585 | UDP6_INC_STATS_BH(sock_net(sk), | |
586 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
587 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
588 | kfree_skb(skb); | |
589 | return -1; | |
590 | } | |
591 | return 0; | |
592 | } | |
593 | ||
ba4e58ec | 594 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba BH |
595 | struct inet6_skb_parm *opt, u8 type, |
596 | u8 code, int offset, __be32 info ) | |
ba4e58ec | 597 | { |
645ca708 | 598 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
599 | } |
600 | ||
d7f3f621 BL |
601 | static struct static_key udpv6_encap_needed __read_mostly; |
602 | void udpv6_encap_enable(void) | |
603 | { | |
604 | if (!static_key_enabled(&udpv6_encap_needed)) | |
605 | static_key_slow_inc(&udpv6_encap_needed); | |
606 | } | |
607 | EXPORT_SYMBOL(udpv6_encap_enable); | |
608 | ||
f7ad74fe | 609 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 610 | { |
ba4e58ec | 611 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 612 | int rc; |
b2bf1e26 | 613 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 614 | |
ba4e58ec GR |
615 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
616 | goto drop; | |
1da177e4 | 617 | |
d7f3f621 BL |
618 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
619 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
620 | ||
621 | /* | |
622 | * This is an encapsulation socket so pass the skb to | |
623 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
624 | * fall through and pass this up the UDP socket. | |
625 | * up->encap_rcv() returns the following value: | |
626 | * =0 if skb was successfully passed to the encap | |
627 | * handler or was discarded by it. | |
628 | * >0 if skb should be passed on to UDP. | |
629 | * <0 if skb should be resubmitted as proto -N | |
630 | */ | |
631 | ||
632 | /* if we're overly short, let UDP handle it */ | |
633 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
634 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
635 | int ret; | |
636 | ||
0a80966b TH |
637 | /* Verify checksum before giving to encap */ |
638 | if (udp_lib_checksum_complete(skb)) | |
639 | goto csum_error; | |
640 | ||
d7f3f621 BL |
641 | ret = encap_rcv(sk, skb); |
642 | if (ret <= 0) { | |
643 | UDP_INC_STATS_BH(sock_net(sk), | |
644 | UDP_MIB_INDATAGRAMS, | |
645 | is_udplite); | |
646 | return -ret; | |
647 | } | |
648 | } | |
649 | ||
650 | /* FALLTHROUGH -- it's a UDP Packet */ | |
651 | } | |
652 | ||
ba4e58ec GR |
653 | /* |
654 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
655 | */ | |
b2bf1e26 | 656 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
657 | |
658 | if (up->pcrlen == 0) { /* full coverage was set */ | |
659 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
660 | " %d while full coverage %d requested\n", | |
661 | UDP_SKB_CB(skb)->cscov, skb->len); | |
662 | goto drop; | |
663 | } | |
664 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
665 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
666 | "too small, need min %d\n", | |
667 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
668 | goto drop; | |
669 | } | |
1da177e4 LT |
670 | } |
671 | ||
33d480ce | 672 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 673 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 674 | goto csum_error; |
1ab6eb62 | 675 | } |
ba4e58ec | 676 | |
cb80ef46 BL |
677 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
678 | goto drop; | |
679 | ||
d826eb14 | 680 | skb_dst_drop(skb); |
cb75994e | 681 | |
cb80ef46 BL |
682 | bh_lock_sock(sk); |
683 | rc = 0; | |
684 | if (!sock_owned_by_user(sk)) | |
685 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
686 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
687 | bh_unlock_sock(sk); | |
688 | goto drop; | |
689 | } | |
690 | bh_unlock_sock(sk); | |
f7ad74fe BL |
691 | |
692 | return rc; | |
6a5dc9e5 ED |
693 | csum_error: |
694 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
ba4e58ec | 695 | drop: |
ef28d1a2 | 696 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 697 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
698 | kfree_skb(skb); |
699 | return -1; | |
1da177e4 LT |
700 | } |
701 | ||
920a4611 | 702 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
b71d1d42 ED |
703 | __be16 loc_port, const struct in6_addr *loc_addr, |
704 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
1da177e4 LT |
705 | int dif) |
706 | { | |
88ab1932 | 707 | struct hlist_nulls_node *node; |
1da177e4 LT |
708 | unsigned short num = ntohs(loc_port); |
709 | ||
9e89fd8b SW |
710 | sk_nulls_for_each_from(sk, node) { |
711 | struct inet_sock *inet = inet_sk(sk); | |
1da177e4 | 712 | |
9e89fd8b | 713 | if (!net_eq(sock_net(sk), net)) |
b8ad0cbc DL |
714 | continue; |
715 | ||
9e89fd8b SW |
716 | if (udp_sk(sk)->udp_port_hash == num && |
717 | sk->sk_family == PF_INET6) { | |
c720c7e8 ED |
718 | if (inet->inet_dport) { |
719 | if (inet->inet_dport != rmt_port) | |
1da177e4 LT |
720 | continue; |
721 | } | |
9e89fd8b SW |
722 | if (!ipv6_addr_any(&sk->sk_v6_daddr) && |
723 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) | |
1da177e4 LT |
724 | continue; |
725 | ||
9e89fd8b | 726 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
1da177e4 LT |
727 | continue; |
728 | ||
9e89fd8b SW |
729 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
730 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)) | |
40796c5e | 731 | continue; |
1da177e4 | 732 | } |
9e89fd8b | 733 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) |
1da177e4 | 734 | continue; |
9e89fd8b | 735 | return sk; |
1da177e4 LT |
736 | } |
737 | } | |
738 | return NULL; | |
739 | } | |
740 | ||
a1ab77f9 ED |
741 | static void flush_stack(struct sock **stack, unsigned int count, |
742 | struct sk_buff *skb, unsigned int final) | |
743 | { | |
cb80ef46 | 744 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 745 | struct sock *sk; |
cb80ef46 | 746 | unsigned int i; |
a1ab77f9 ED |
747 | |
748 | for (i = 0; i < count; i++) { | |
f6b8f32c | 749 | sk = stack[i]; |
cb80ef46 BL |
750 | if (likely(skb1 == NULL)) |
751 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
752 | if (!skb1) { | |
753 | atomic_inc(&sk->sk_drops); | |
754 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
755 | IS_UDPLITE(sk)); | |
756 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
757 | IS_UDPLITE(sk)); | |
a1ab77f9 | 758 | } |
cb80ef46 BL |
759 | |
760 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
761 | skb1 = NULL; | |
a1ab77f9 | 762 | } |
cb80ef46 BL |
763 | if (unlikely(skb1)) |
764 | kfree_skb(skb1); | |
a1ab77f9 | 765 | } |
4068579e TH |
766 | |
767 | static void udp6_csum_zero_error(struct sk_buff *skb) | |
768 | { | |
769 | /* RFC 2460 section 8.1 says that we SHOULD log | |
770 | * this error. Well, it is reasonable. | |
771 | */ | |
772 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", | |
773 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
774 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
775 | } | |
776 | ||
1da177e4 LT |
777 | /* |
778 | * Note: called only from the BH handler context, | |
779 | * so we don't need to lock the hashes. | |
780 | */ | |
e3163493 | 781 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 782 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
645ca708 | 783 | struct udp_table *udptable) |
1da177e4 | 784 | { |
a1ab77f9 | 785 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 786 | const struct udphdr *uh = udp_hdr(skb); |
f86dcc5a | 787 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
1da177e4 | 788 | int dif; |
a1ab77f9 | 789 | unsigned int i, count = 0; |
1da177e4 | 790 | |
645ca708 | 791 | spin_lock(&hslot->lock); |
88ab1932 | 792 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 793 | dif = inet6_iif(skb); |
920a4611 | 794 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
a1ab77f9 | 795 | while (sk) { |
1c19448c | 796 | /* If zero checksum and no_check is not on for |
4068579e TH |
797 | * the socket then skip it. |
798 | */ | |
1c19448c | 799 | if (uh->check || udp_sk(sk)->no_check6_rx) |
4068579e TH |
800 | stack[count++] = sk; |
801 | ||
a1ab77f9 ED |
802 | sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, |
803 | uh->source, saddr, dif); | |
804 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
805 | if (!sk) | |
806 | break; | |
807 | flush_stack(stack, count, skb, ~0); | |
808 | count = 0; | |
95766fff | 809 | } |
1da177e4 | 810 | } |
a1ab77f9 ED |
811 | /* |
812 | * before releasing the lock, we must take reference on sockets | |
813 | */ | |
814 | for (i = 0; i < count; i++) | |
815 | sock_hold(stack[i]); | |
816 | ||
645ca708 | 817 | spin_unlock(&hslot->lock); |
a1ab77f9 ED |
818 | |
819 | if (count) { | |
820 | flush_stack(stack, count, skb, count - 1); | |
821 | ||
822 | for (i = 0; i < count; i++) | |
823 | sock_put(stack[i]); | |
824 | } else { | |
825 | kfree_skb(skb); | |
826 | } | |
ba4e58ec | 827 | return 0; |
1da177e4 LT |
828 | } |
829 | ||
645ca708 | 830 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 831 | int proto) |
1da177e4 | 832 | { |
3ffe533c | 833 | struct net *net = dev_net(skb->dev); |
1da177e4 | 834 | struct sock *sk; |
1ab1457c | 835 | struct udphdr *uh; |
b71d1d42 | 836 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
837 | u32 ulen = 0; |
838 | ||
839 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 840 | goto discard; |
1da177e4 | 841 | |
0660e03f ACM |
842 | saddr = &ipv6_hdr(skb)->saddr; |
843 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 844 | uh = udp_hdr(skb); |
1da177e4 LT |
845 | |
846 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
847 | if (ulen > skb->len) |
848 | goto short_packet; | |
1da177e4 | 849 | |
759e5d00 HX |
850 | if (proto == IPPROTO_UDP) { |
851 | /* UDP validates ulen. */ | |
1da177e4 | 852 | |
ba4e58ec GR |
853 | /* Check for jumbo payload */ |
854 | if (ulen == 0) | |
855 | ulen = skb->len; | |
1da177e4 | 856 | |
ba4e58ec GR |
857 | if (ulen < sizeof(*uh)) |
858 | goto short_packet; | |
1da177e4 | 859 | |
ba4e58ec GR |
860 | if (ulen < skb->len) { |
861 | if (pskb_trim_rcsum(skb, ulen)) | |
862 | goto short_packet; | |
0660e03f ACM |
863 | saddr = &ipv6_hdr(skb)->saddr; |
864 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 865 | uh = udp_hdr(skb); |
ba4e58ec | 866 | } |
ba4e58ec | 867 | } |
1da177e4 | 868 | |
759e5d00 | 869 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 870 | goto csum_error; |
759e5d00 | 871 | |
1ab1457c YH |
872 | /* |
873 | * Multicast receive code | |
1da177e4 | 874 | */ |
ba4e58ec | 875 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
876 | return __udp6_lib_mcast_deliver(net, skb, |
877 | saddr, daddr, udptable); | |
1da177e4 LT |
878 | |
879 | /* Unicast */ | |
880 | ||
1ab1457c | 881 | /* |
1da177e4 LT |
882 | * check socket cache ... must talk to Alan about his plans |
883 | * for sock caches... i'll skip this for now. | |
884 | */ | |
607c4aaf | 885 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
cb80ef46 | 886 | if (sk != NULL) { |
a5b50476 ET |
887 | int ret; |
888 | ||
1c19448c | 889 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
79e0f1c9 | 890 | sock_put(sk); |
4068579e TH |
891 | udp6_csum_zero_error(skb); |
892 | goto csum_error; | |
893 | } | |
894 | ||
a5b50476 | 895 | ret = udpv6_queue_rcv_skb(sk, skb); |
cb80ef46 | 896 | sock_put(sk); |
1da177e4 | 897 | |
cb80ef46 BL |
898 | /* a return value > 0 means to resubmit the input, but |
899 | * it wants the return to be -protocol, or 0 | |
900 | */ | |
901 | if (ret > 0) | |
902 | return -ret; | |
1da177e4 | 903 | |
add459aa | 904 | return 0; |
1da177e4 | 905 | } |
1ab1457c | 906 | |
4068579e TH |
907 | if (!uh->check) { |
908 | udp6_csum_zero_error(skb); | |
909 | goto csum_error; | |
910 | } | |
911 | ||
cb80ef46 | 912 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 913 | goto discard; |
cb80ef46 BL |
914 | |
915 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 916 | goto csum_error; |
cb80ef46 BL |
917 | |
918 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
919 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
920 | ||
921 | kfree_skb(skb); | |
add459aa | 922 | return 0; |
1da177e4 | 923 | |
1ab1457c | 924 | short_packet: |
d6bc0149 | 925 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
db8dac20 | 926 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
d6bc0149 BM |
927 | saddr, |
928 | ntohs(uh->source), | |
929 | ulen, | |
930 | skb->len, | |
931 | daddr, | |
932 | ntohs(uh->dest)); | |
6a5dc9e5 ED |
933 | goto discard; |
934 | csum_error: | |
935 | UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); | |
1da177e4 | 936 | discard: |
ef28d1a2 | 937 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 938 | kfree_skb(skb); |
add459aa | 939 | return 0; |
1da177e4 | 940 | } |
ba4e58ec | 941 | |
e5bbef20 | 942 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 943 | { |
645ca708 | 944 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
945 | } |
946 | ||
1da177e4 LT |
947 | /* |
948 | * Throw away all pending data and cancel the corking. Socket is locked. | |
949 | */ | |
950 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
951 | { | |
952 | struct udp_sock *up = udp_sk(sk); | |
953 | ||
36d926b9 DL |
954 | if (up->pending == AF_INET) |
955 | udp_flush_pending_frames(sk); | |
956 | else if (up->pending) { | |
1da177e4 LT |
957 | up->len = 0; |
958 | up->pending = 0; | |
959 | ip6_flush_pending_frames(sk); | |
1ab1457c | 960 | } |
1da177e4 LT |
961 | } |
962 | ||
493c6be3 SS |
963 | /** |
964 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming | |
965 | * @sk: socket we are sending on | |
966 | * @skb: sk_buff containing the filled-in UDP header | |
967 | * (checksum field must be zeroed out) | |
968 | */ | |
969 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
970 | const struct in6_addr *saddr, | |
971 | const struct in6_addr *daddr, int len) | |
972 | { | |
973 | unsigned int offset; | |
974 | struct udphdr *uh = udp_hdr(skb); | |
975 | __wsum csum = 0; | |
976 | ||
977 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
978 | /* Only one fragment on the socket. */ | |
979 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
980 | skb->csum_offset = offsetof(struct udphdr, check); | |
981 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
982 | } else { | |
983 | /* | |
984 | * HW-checksum won't work as there are two or more | |
985 | * fragments on the socket so that all csums of sk_buffs | |
986 | * should be together | |
987 | */ | |
988 | offset = skb_transport_offset(skb); | |
989 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
990 | ||
991 | skb->ip_summed = CHECKSUM_NONE; | |
992 | ||
993 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
994 | csum = csum_add(csum, skb->csum); | |
995 | } | |
996 | ||
997 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
998 | csum); | |
999 | if (uh->check == 0) | |
1000 | uh->check = CSUM_MANGLED_0; | |
1001 | } | |
1002 | } | |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Sending | |
1006 | */ | |
1007 | ||
4c0a6cb0 | 1008 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
1009 | { |
1010 | struct sk_buff *skb; | |
1011 | struct udphdr *uh; | |
4c0a6cb0 | 1012 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 1013 | struct inet_sock *inet = inet_sk(sk); |
8822b64a | 1014 | struct flowi6 *fl6; |
1da177e4 | 1015 | int err = 0; |
b2bf1e26 | 1016 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1017 | __wsum csum = 0; |
1da177e4 | 1018 | |
8822b64a HFS |
1019 | if (up->pending == AF_INET) |
1020 | return udp_push_pending_frames(sk); | |
1021 | ||
1022 | fl6 = &inet->cork.fl.u.ip6; | |
1023 | ||
1da177e4 LT |
1024 | /* Grab the skbuff where UDP header space exists. */ |
1025 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
1026 | goto out; | |
1027 | ||
1028 | /* | |
1029 | * Create a UDP header | |
1030 | */ | |
4bedb452 | 1031 | uh = udp_hdr(skb); |
1958b856 DM |
1032 | uh->source = fl6->fl6_sport; |
1033 | uh->dest = fl6->fl6_dport; | |
1da177e4 LT |
1034 | uh->len = htons(up->len); |
1035 | uh->check = 0; | |
1036 | ||
b2bf1e26 | 1037 | if (is_udplite) |
ba4e58ec | 1038 | csum = udplite_csum_outgoing(sk, skb); |
1c19448c | 1039 | else if (up->no_check6_tx) { /* UDP csum disabled */ |
4068579e TH |
1040 | skb->ip_summed = CHECKSUM_NONE; |
1041 | goto send; | |
1042 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
4c9483b2 | 1043 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, |
493c6be3 SS |
1044 | up->len); |
1045 | goto send; | |
1046 | } else | |
ba4e58ec | 1047 | csum = udp_csum_outgoing(sk, skb); |
1da177e4 | 1048 | |
ba4e58ec | 1049 | /* add protocol-dependent pseudo-header */ |
4c9483b2 DM |
1050 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
1051 | up->len, fl6->flowi6_proto, csum); | |
1da177e4 | 1052 | if (uh->check == 0) |
f6ab0288 | 1053 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1054 | |
493c6be3 | 1055 | send: |
1da177e4 | 1056 | err = ip6_push_pending_frames(sk); |
6ce9e7b5 ED |
1057 | if (err) { |
1058 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
1059 | UDP6_INC_STATS_USER(sock_net(sk), | |
1060 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
1061 | err = 0; | |
1062 | } | |
1063 | } else | |
1064 | UDP6_INC_STATS_USER(sock_net(sk), | |
1065 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
1066 | out: |
1067 | up->len = 0; | |
1068 | up->pending = 0; | |
1069 | return err; | |
1070 | } | |
1071 | ||
ba4e58ec | 1072 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
1073 | struct msghdr *msg, size_t len) |
1074 | { | |
1075 | struct ipv6_txoptions opt_space; | |
1076 | struct udp_sock *up = udp_sk(sk); | |
1077 | struct inet_sock *inet = inet_sk(sk); | |
1078 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1079 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1080 | struct in6_addr *daddr, *final_p, final; |
1da177e4 LT |
1081 | struct ipv6_txoptions *opt = NULL; |
1082 | struct ip6_flowlabel *flowlabel = NULL; | |
4c9483b2 | 1083 | struct flowi6 fl6; |
1da177e4 LT |
1084 | struct dst_entry *dst; |
1085 | int addr_len = msg->msg_namelen; | |
1086 | int ulen = len; | |
1087 | int hlimit = -1; | |
41a1f8ea | 1088 | int tclass = -1; |
13b52cd4 | 1089 | int dontfrag = -1; |
1da177e4 LT |
1090 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1091 | int err; | |
987905de | 1092 | int connected = 0; |
b2bf1e26 | 1093 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1094 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1095 | |
1096 | /* destination address check */ | |
1097 | if (sin6) { | |
1098 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1099 | return -EINVAL; | |
1100 | ||
1101 | switch (sin6->sin6_family) { | |
1102 | case AF_INET6: | |
1103 | if (addr_len < SIN6_LEN_RFC2133) | |
1104 | return -EINVAL; | |
1105 | daddr = &sin6->sin6_addr; | |
1106 | break; | |
1107 | case AF_INET: | |
1108 | goto do_udp_sendmsg; | |
1109 | case AF_UNSPEC: | |
1110 | msg->msg_name = sin6 = NULL; | |
1111 | msg->msg_namelen = addr_len = 0; | |
1112 | daddr = NULL; | |
1113 | break; | |
1114 | default: | |
1115 | return -EINVAL; | |
1116 | } | |
1117 | } else if (!up->pending) { | |
1118 | if (sk->sk_state != TCP_ESTABLISHED) | |
1119 | return -EDESTADDRREQ; | |
efe4208f | 1120 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1121 | } else |
1da177e4 LT |
1122 | daddr = NULL; |
1123 | ||
1124 | if (daddr) { | |
e773e4fa | 1125 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1126 | struct sockaddr_in sin; |
1127 | sin.sin_family = AF_INET; | |
c720c7e8 | 1128 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1129 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1130 | msg->msg_name = &sin; | |
1131 | msg->msg_namelen = sizeof(sin); | |
1132 | do_udp_sendmsg: | |
1133 | if (__ipv6_only_sock(sk)) | |
1134 | return -ENETUNREACH; | |
1135 | return udp_sendmsg(iocb, sk, msg, len); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | if (up->pending == AF_INET) | |
1140 | return udp_sendmsg(iocb, sk, msg, len); | |
1141 | ||
1142 | /* Rough check on arithmetic overflow, | |
b59e139b | 1143 | better check is made in ip6_append_data(). |
1da177e4 LT |
1144 | */ |
1145 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1146 | return -EMSGSIZE; | |
1ab1457c | 1147 | |
1da177e4 LT |
1148 | if (up->pending) { |
1149 | /* | |
1150 | * There are pending frames. | |
1151 | * The socket lock must be held while it's corked. | |
1152 | */ | |
1153 | lock_sock(sk); | |
1154 | if (likely(up->pending)) { | |
1155 | if (unlikely(up->pending != AF_INET6)) { | |
1156 | release_sock(sk); | |
1157 | return -EAFNOSUPPORT; | |
1158 | } | |
1159 | dst = NULL; | |
1160 | goto do_append_data; | |
1161 | } | |
1162 | release_sock(sk); | |
1163 | } | |
1164 | ulen += sizeof(struct udphdr); | |
1165 | ||
4c9483b2 | 1166 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1167 | |
1168 | if (sin6) { | |
1169 | if (sin6->sin6_port == 0) | |
1170 | return -EINVAL; | |
1171 | ||
1958b856 | 1172 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1173 | daddr = &sin6->sin6_addr; |
1174 | ||
1175 | if (np->sndflow) { | |
4c9483b2 DM |
1176 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1177 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1178 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1179 | if (flowlabel == NULL) |
1180 | return -EINVAL; | |
1da177e4 LT |
1181 | } |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Otherwise it will be difficult to maintain | |
1186 | * sk->sk_dst_cache. | |
1187 | */ | |
1188 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1189 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1190 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1191 | |
1192 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1193 | sin6->sin6_scope_id && | |
842df073 | 1194 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1195 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1196 | } else { |
1197 | if (sk->sk_state != TCP_ESTABLISHED) | |
1198 | return -EDESTADDRREQ; | |
1199 | ||
1958b856 | 1200 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1201 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1202 | fl6.flowlabel = np->flow_label; |
987905de | 1203 | connected = 1; |
1da177e4 LT |
1204 | } |
1205 | ||
4c9483b2 DM |
1206 | if (!fl6.flowi6_oif) |
1207 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1208 | |
4c9483b2 DM |
1209 | if (!fl6.flowi6_oif) |
1210 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1211 | |
4c9483b2 | 1212 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1213 | |
1da177e4 LT |
1214 | if (msg->msg_controllen) { |
1215 | opt = &opt_space; | |
1216 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1217 | opt->tot_len = sizeof(*opt); | |
1218 | ||
73df66f8 TP |
1219 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1220 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1221 | if (err < 0) { |
1222 | fl6_sock_release(flowlabel); | |
1223 | return err; | |
1224 | } | |
4c9483b2 DM |
1225 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1226 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1227 | if (flowlabel == NULL) |
1228 | return -EINVAL; | |
1229 | } | |
1230 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1231 | opt = NULL; | |
987905de | 1232 | connected = 0; |
1da177e4 LT |
1233 | } |
1234 | if (opt == NULL) | |
1235 | opt = np->opt; | |
df9890c3 YH |
1236 | if (flowlabel) |
1237 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1238 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1239 | |
4c9483b2 | 1240 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1241 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1242 | fl6.daddr = *daddr; |
876c7f41 | 1243 | else |
4c9483b2 DM |
1244 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1245 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1246 | fl6.saddr = np->saddr; |
1958b856 | 1247 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1248 | |
4c9483b2 | 1249 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1250 | if (final_p) |
987905de | 1251 | connected = 0; |
1da177e4 | 1252 | |
4c9483b2 DM |
1253 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1254 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1255 | connected = 0; |
c4062dfc EH |
1256 | } else if (!fl6.flowi6_oif) |
1257 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1258 | |
4c9483b2 | 1259 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1260 | |
0e0d44ab | 1261 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1262 | if (IS_ERR(dst)) { |
1263 | err = PTR_ERR(dst); | |
1264 | dst = NULL; | |
1da177e4 | 1265 | goto out; |
14e50e57 | 1266 | } |
1da177e4 | 1267 | |
5c98631c LC |
1268 | if (hlimit < 0) |
1269 | hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1270 | |
e651f03a | 1271 | if (tclass < 0) |
41a1f8ea | 1272 | tclass = np->tclass; |
41a1f8ea | 1273 | |
1da177e4 LT |
1274 | if (msg->msg_flags&MSG_CONFIRM) |
1275 | goto do_confirm; | |
1276 | back_from_confirm: | |
1277 | ||
1278 | lock_sock(sk); | |
1279 | if (unlikely(up->pending)) { | |
1280 | /* The socket is already corked while preparing it. */ | |
1281 | /* ... which is an evident application bug. --ANK */ | |
1282 | release_sock(sk); | |
1283 | ||
64ce2073 | 1284 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
1285 | err = -EINVAL; |
1286 | goto out; | |
1287 | } | |
1288 | ||
1289 | up->pending = AF_INET6; | |
1290 | ||
1291 | do_append_data: | |
e36d3ff9 JP |
1292 | if (dontfrag < 0) |
1293 | dontfrag = np->dontfrag; | |
1da177e4 | 1294 | up->len += ulen; |
ba4e58ec GR |
1295 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1296 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
4c9483b2 | 1297 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
41a1f8ea | 1298 | (struct rt6_info*)dst, |
13b52cd4 | 1299 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
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 | |
a5e7c210 DM |
1307 | if (dst) { |
1308 | if (connected) { | |
1309 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1310 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1311 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1312 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1313 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1314 | &np->saddr : |
1315 | #endif | |
1316 | NULL); | |
a5e7c210 DM |
1317 | } else { |
1318 | dst_release(dst); | |
1319 | } | |
a3c96089 | 1320 | dst = NULL; |
a5e7c210 DM |
1321 | } |
1322 | ||
1da177e4 LT |
1323 | if (err > 0) |
1324 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1325 | release_sock(sk); | |
1326 | out: | |
a3c96089 | 1327 | dst_release(dst); |
1da177e4 | 1328 | fl6_sock_release(flowlabel); |
cd562c98 | 1329 | if (!err) |
1da177e4 | 1330 | return len; |
a18135eb DM |
1331 | /* |
1332 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1333 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1334 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1335 | * things). We could add another new stat but at least for now that | |
1336 | * seems like overkill. | |
1337 | */ | |
1338 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1339 | UDP6_INC_STATS_USER(sock_net(sk), |
1340 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1341 | } |
1da177e4 LT |
1342 | return err; |
1343 | ||
1344 | do_confirm: | |
1345 | dst_confirm(dst); | |
1346 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1347 | goto back_from_confirm; | |
1348 | err = 0; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
7d06b2e0 | 1352 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1353 | { |
44046a59 | 1354 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1355 | lock_sock(sk); |
1356 | udp_v6_flush_pending_frames(sk); | |
1357 | release_sock(sk); | |
1358 | ||
44046a59 TP |
1359 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1360 | void (*encap_destroy)(struct sock *sk); | |
1361 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1362 | if (encap_destroy) | |
1363 | encap_destroy(sk); | |
1364 | } | |
1365 | ||
1da177e4 | 1366 | inet6_destroy_sock(sk); |
1da177e4 LT |
1367 | } |
1368 | ||
1369 | /* | |
1370 | * Socket option code for UDP | |
1371 | */ | |
ba4e58ec | 1372 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1373 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1374 | { |
db8dac20 | 1375 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1376 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1377 | udp_v6_push_pending_frames); | |
ba4e58ec | 1378 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1379 | } |
1380 | ||
1381 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1382 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1383 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1384 | { |
db8dac20 | 1385 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1386 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1387 | udp_v6_push_pending_frames); | |
ba4e58ec | 1388 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1389 | } |
1390 | #endif | |
1391 | ||
ba4e58ec GR |
1392 | int 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 ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1398 | } |
1399 | ||
1400 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1401 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1402 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1403 | { |
db8dac20 | 1404 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1405 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1406 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1407 | } |
1408 | #endif | |
1409 | ||
41135cc8 | 1410 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1411 | .handler = udpv6_rcv, |
1412 | .err_handler = udpv6_err, | |
1413 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1414 | }; | |
1415 | ||
1416 | /* ------------------------------------------------------------------------ */ | |
1417 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1418 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1419 | { |
17ef66af LC |
1420 | if (v == SEQ_START_TOKEN) { |
1421 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1422 | } else { | |
1423 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1424 | struct inet_sock *inet = inet_sk(v); | |
1425 | __u16 srcp = ntohs(inet->inet_sport); | |
1426 | __u16 destp = ntohs(inet->inet_dport); | |
1427 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1428 | } | |
1da177e4 LT |
1429 | return 0; |
1430 | } | |
1431 | ||
73cb88ec AV |
1432 | static const struct file_operations udp6_afinfo_seq_fops = { |
1433 | .owner = THIS_MODULE, | |
1434 | .open = udp_seq_open, | |
1435 | .read = seq_read, | |
1436 | .llseek = seq_lseek, | |
1437 | .release = seq_release_net | |
1438 | }; | |
1439 | ||
1da177e4 | 1440 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1441 | .name = "udp6", |
1442 | .family = AF_INET6, | |
645ca708 | 1443 | .udp_table = &udp_table, |
73cb88ec | 1444 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1445 | .seq_ops = { |
1446 | .show = udp6_seq_show, | |
1447 | }, | |
1da177e4 LT |
1448 | }; |
1449 | ||
2c8c1e72 | 1450 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1451 | { |
0c96d8c5 | 1452 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1453 | } |
1454 | ||
0c96d8c5 DL |
1455 | void udp6_proc_exit(struct net *net) { |
1456 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1457 | } |
1458 | #endif /* CONFIG_PROC_FS */ | |
1459 | ||
f77d6021 ED |
1460 | void udp_v6_clear_sk(struct sock *sk, int size) |
1461 | { | |
1462 | struct inet_sock *inet = inet_sk(sk); | |
1463 | ||
1464 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1465 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1466 | ||
1467 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1468 | memset(&inet->pinet6 + 1, 0, size); | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | /* ------------------------------------------------------------------------ */ |
1472 | ||
1473 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1474 | .name = "UDPv6", |
1475 | .owner = THIS_MODULE, | |
ba4e58ec | 1476 | .close = udp_lib_close, |
543d9cfe ACM |
1477 | .connect = ip6_datagram_connect, |
1478 | .disconnect = udp_disconnect, | |
1479 | .ioctl = udp_ioctl, | |
1480 | .destroy = udpv6_destroy_sock, | |
1481 | .setsockopt = udpv6_setsockopt, | |
1482 | .getsockopt = udpv6_getsockopt, | |
1483 | .sendmsg = udpv6_sendmsg, | |
1484 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1485 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1486 | .hash = udp_lib_hash, |
1487 | .unhash = udp_lib_unhash, | |
719f8358 | 1488 | .rehash = udp_v6_rehash, |
543d9cfe | 1489 | .get_port = udp_v6_get_port, |
95766fff HA |
1490 | .memory_allocated = &udp_memory_allocated, |
1491 | .sysctl_mem = sysctl_udp_mem, | |
1492 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1493 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1494 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1495 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1496 | .h.udp_table = &udp_table, |
3fdadf7d | 1497 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1498 | .compat_setsockopt = compat_udpv6_setsockopt, |
1499 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1500 | #endif |
f77d6021 | 1501 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1502 | }; |
1503 | ||
1da177e4 LT |
1504 | static struct inet_protosw udpv6_protosw = { |
1505 | .type = SOCK_DGRAM, | |
1506 | .protocol = IPPROTO_UDP, | |
1507 | .prot = &udpv6_prot, | |
1508 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1509 | .flags = INET_PROTOSW_PERMANENT, |
1510 | }; | |
1511 | ||
1512 | ||
7f4e4868 | 1513 | int __init udpv6_init(void) |
1da177e4 | 1514 | { |
7f4e4868 DL |
1515 | int ret; |
1516 | ||
3336288a VY |
1517 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1518 | if (ret) | |
c6b641a4 | 1519 | goto out; |
3336288a | 1520 | |
7f4e4868 DL |
1521 | ret = inet6_register_protosw(&udpv6_protosw); |
1522 | if (ret) | |
1523 | goto out_udpv6_protocol; | |
1524 | out: | |
1525 | return ret; | |
1526 | ||
1527 | out_udpv6_protocol: | |
1528 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1529 | goto out; | |
1530 | } | |
1531 | ||
09f7709f | 1532 | void udpv6_exit(void) |
7f4e4868 DL |
1533 | { |
1534 | inet6_unregister_protosw(&udpv6_protosw); | |
1535 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1536 | } |