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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> |
1da177e4 LT |
37 | #include <asm/uaccess.h> |
38 | ||
1da177e4 LT |
39 | #include <net/ndisc.h> |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/ip6_route.h> | |
1da177e4 | 43 | #include <net/raw.h> |
c752f073 | 44 | #include <net/tcp_states.h> |
1da177e4 LT |
45 | #include <net/ip6_checksum.h> |
46 | #include <net/xfrm.h> | |
47 | ||
48 | #include <linux/proc_fs.h> | |
49 | #include <linux/seq_file.h> | |
ba4e58ec | 50 | #include "udp_impl.h" |
1da177e4 | 51 | |
b2f5e7cd VY |
52 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
53 | { | |
54 | const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; | |
55 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); | |
499923c7 VY |
56 | __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; |
57 | __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); | |
b2f5e7cd VY |
58 | int sk_ipv6only = ipv6_only_sock(sk); |
59 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
60 | int addr_type = ipv6_addr_type(sk_rcv_saddr6); | |
61 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; | |
62 | ||
63 | /* if both are mapped, treat as IPv4 */ | |
64 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 VY |
65 | return (!sk2_ipv6only && |
66 | (!sk_rcv_saddr || !sk2_rcv_saddr || | |
67 | sk_rcv_saddr == sk2_rcv_saddr)); | |
b2f5e7cd VY |
68 | |
69 | if (addr_type2 == IPV6_ADDR_ANY && | |
70 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
71 | return 1; | |
72 | ||
73 | if (addr_type == IPV6_ADDR_ANY && | |
74 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) | |
75 | return 1; | |
76 | ||
77 | if (sk2_rcv_saddr6 && | |
78 | ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) | |
79 | return 1; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
6ba5a3c5 | 84 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 85 | { |
6ba5a3c5 | 86 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); |
1da177e4 LT |
87 | } |
88 | ||
645ca708 ED |
89 | static inline int compute_score(struct sock *sk, struct net *net, |
90 | unsigned short hnum, | |
91 | struct in6_addr *saddr, __be16 sport, | |
92 | struct in6_addr *daddr, __be16 dport, | |
93 | int dif) | |
94 | { | |
95 | int score = -1; | |
96 | ||
97 | if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum && | |
98 | sk->sk_family == PF_INET6) { | |
99 | struct ipv6_pinfo *np = inet6_sk(sk); | |
100 | struct inet_sock *inet = inet_sk(sk); | |
101 | ||
102 | score = 0; | |
103 | if (inet->dport) { | |
104 | if (inet->dport != sport) | |
105 | return -1; | |
106 | score++; | |
107 | } | |
108 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
109 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
110 | return -1; | |
111 | score++; | |
112 | } | |
113 | if (!ipv6_addr_any(&np->daddr)) { | |
114 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
115 | return -1; | |
116 | score++; | |
117 | } | |
118 | if (sk->sk_bound_dev_if) { | |
119 | if (sk->sk_bound_dev_if != dif) | |
120 | return -1; | |
121 | score++; | |
122 | } | |
123 | } | |
124 | return score; | |
125 | } | |
126 | ||
fa4d3c62 PE |
127 | static struct sock *__udp6_lib_lookup(struct net *net, |
128 | struct in6_addr *saddr, __be16 sport, | |
ba4e58ec | 129 | struct in6_addr *daddr, __be16 dport, |
645ca708 | 130 | int dif, struct udp_table *udptable) |
1da177e4 | 131 | { |
271b72c7 | 132 | struct sock *sk, *result; |
88ab1932 | 133 | struct hlist_nulls_node *node; |
1da177e4 | 134 | unsigned short hnum = ntohs(dport); |
645ca708 ED |
135 | unsigned int hash = udp_hashfn(net, hnum); |
136 | struct udp_hslot *hslot = &udptable->hash[hash]; | |
271b72c7 | 137 | int score, badness; |
645ca708 | 138 | |
271b72c7 ED |
139 | rcu_read_lock(); |
140 | begin: | |
141 | result = NULL; | |
142 | badness = -1; | |
88ab1932 | 143 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
144 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
145 | if (score > badness) { | |
146 | result = sk; | |
147 | badness = score; | |
1da177e4 LT |
148 | } |
149 | } | |
88ab1932 ED |
150 | /* |
151 | * if the nulls value we got at the end of this lookup is | |
152 | * not the expected one, we must restart lookup. | |
153 | * We probably met an item that was moved to another chain. | |
154 | */ | |
155 | if (get_nulls_value(node) != hash) | |
156 | goto begin; | |
157 | ||
271b72c7 ED |
158 | if (result) { |
159 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
160 | result = NULL; | |
161 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
162 | daddr, dport, dif) < badness)) { | |
163 | sock_put(result); | |
164 | goto begin; | |
165 | } | |
166 | } | |
167 | rcu_read_unlock(); | |
1da177e4 LT |
168 | return result; |
169 | } | |
170 | ||
607c4aaf KK |
171 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
172 | __be16 sport, __be16 dport, | |
645ca708 | 173 | struct udp_table *udptable) |
607c4aaf | 174 | { |
23542618 | 175 | struct sock *sk; |
607c4aaf KK |
176 | struct ipv6hdr *iph = ipv6_hdr(skb); |
177 | ||
23542618 KK |
178 | if (unlikely(sk = skb_steal_sock(skb))) |
179 | return sk; | |
180 | else | |
181 | return __udp6_lib_lookup(dev_net(skb->dst->dev), &iph->saddr, sport, | |
182 | &iph->daddr, dport, inet6_iif(skb), | |
183 | udptable); | |
607c4aaf KK |
184 | } |
185 | ||
1da177e4 LT |
186 | /* |
187 | * This should be easy, if there is something there we | |
188 | * return it, otherwise we block. | |
189 | */ | |
190 | ||
ba4e58ec | 191 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
192 | struct msghdr *msg, size_t len, |
193 | int noblock, int flags, int *addr_len) | |
194 | { | |
195 | struct ipv6_pinfo *np = inet6_sk(sk); | |
196 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 197 | struct sk_buff *skb; |
759e5d00 | 198 | unsigned int ulen, copied; |
a59322be | 199 | int peeked; |
759e5d00 HX |
200 | int err; |
201 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 202 | int is_udp4; |
1da177e4 | 203 | |
1ab1457c YH |
204 | if (addr_len) |
205 | *addr_len=sizeof(struct sockaddr_in6); | |
206 | ||
1da177e4 LT |
207 | if (flags & MSG_ERRQUEUE) |
208 | return ipv6_recv_error(sk, msg, len); | |
209 | ||
210 | try_again: | |
a59322be HX |
211 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
212 | &peeked, &err); | |
1da177e4 LT |
213 | if (!skb) |
214 | goto out; | |
215 | ||
759e5d00 HX |
216 | ulen = skb->len - sizeof(struct udphdr); |
217 | copied = len; | |
218 | if (copied > ulen) | |
219 | copied = ulen; | |
220 | else if (copied < ulen) | |
1ab1457c | 221 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 222 | |
f26ba175 WY |
223 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
224 | ||
ba4e58ec | 225 | /* |
759e5d00 HX |
226 | * If checksum is needed at all, try to do it while copying the |
227 | * data. If the data is truncated, or if we only want a partial | |
228 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 229 | */ |
ba4e58ec | 230 | |
759e5d00 HX |
231 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
232 | if (udp_lib_checksum_complete(skb)) | |
1da177e4 | 233 | goto csum_copy_err; |
ba4e58ec GR |
234 | } |
235 | ||
60476372 | 236 | if (skb_csum_unnecessary(skb)) |
ba4e58ec GR |
237 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
238 | msg->msg_iov, copied ); | |
239 | else { | |
1da177e4 LT |
240 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
241 | if (err == -EINVAL) | |
242 | goto csum_copy_err; | |
243 | } | |
244 | if (err) | |
245 | goto out_free; | |
246 | ||
f26ba175 WY |
247 | if (!peeked) { |
248 | if (is_udp4) | |
249 | UDP_INC_STATS_USER(sock_net(sk), | |
250 | UDP_MIB_INDATAGRAMS, is_udplite); | |
251 | else | |
252 | UDP6_INC_STATS_USER(sock_net(sk), | |
253 | UDP_MIB_INDATAGRAMS, is_udplite); | |
254 | } | |
cb75994e | 255 | |
1da177e4 LT |
256 | sock_recv_timestamp(msg, sk, skb); |
257 | ||
258 | /* Copy the address. */ | |
259 | if (msg->msg_name) { | |
260 | struct sockaddr_in6 *sin6; | |
1ab1457c | 261 | |
1da177e4 LT |
262 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
263 | sin6->sin6_family = AF_INET6; | |
4bedb452 | 264 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 LT |
265 | sin6->sin6_flowinfo = 0; |
266 | sin6->sin6_scope_id = 0; | |
267 | ||
f26ba175 | 268 | if (is_udp4) |
1da177e4 | 269 | ipv6_addr_set(&sin6->sin6_addr, 0, 0, |
eddc9ec5 | 270 | htonl(0xffff), ip_hdr(skb)->saddr); |
1da177e4 | 271 | else { |
0660e03f ACM |
272 | ipv6_addr_copy(&sin6->sin6_addr, |
273 | &ipv6_hdr(skb)->saddr); | |
1da177e4 LT |
274 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
275 | sin6->sin6_scope_id = IP6CB(skb)->iif; | |
276 | } | |
277 | ||
278 | } | |
f26ba175 | 279 | if (is_udp4) { |
1da177e4 LT |
280 | if (inet->cmsg_flags) |
281 | ip_cmsg_recv(msg, skb); | |
282 | } else { | |
283 | if (np->rxopt.all) | |
284 | datagram_recv_ctl(sk, msg, skb); | |
1ab1457c | 285 | } |
1da177e4 LT |
286 | |
287 | err = copied; | |
288 | if (flags & MSG_TRUNC) | |
759e5d00 | 289 | err = ulen; |
1da177e4 LT |
290 | |
291 | out_free: | |
95766fff | 292 | lock_sock(sk); |
1da177e4 | 293 | skb_free_datagram(sk, skb); |
95766fff | 294 | release_sock(sk); |
1da177e4 LT |
295 | out: |
296 | return err; | |
297 | ||
298 | csum_copy_err: | |
95766fff | 299 | lock_sock(sk); |
0856f939 WY |
300 | if (!skb_kill_datagram(sk, skb, flags)) { |
301 | if (is_udp4) | |
302 | UDP_INC_STATS_USER(sock_net(sk), | |
303 | UDP_MIB_INERRORS, is_udplite); | |
304 | else | |
305 | UDP6_INC_STATS_USER(sock_net(sk), | |
306 | UDP_MIB_INERRORS, is_udplite); | |
307 | } | |
95766fff | 308 | release_sock(sk); |
1da177e4 | 309 | |
7a0ff716 | 310 | if (flags & MSG_DONTWAIT) |
1da177e4 | 311 | return -EAGAIN; |
1da177e4 LT |
312 | goto try_again; |
313 | } | |
314 | ||
ba4e58ec GR |
315 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
316 | int type, int code, int offset, __be32 info, | |
645ca708 | 317 | struct udp_table *udptable) |
1da177e4 LT |
318 | { |
319 | struct ipv6_pinfo *np; | |
320 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
1da177e4 LT |
321 | struct in6_addr *saddr = &hdr->saddr; |
322 | struct in6_addr *daddr = &hdr->daddr; | |
323 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); | |
324 | struct sock *sk; | |
325 | int err; | |
326 | ||
c346dca1 | 327 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 328 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
329 | if (sk == NULL) |
330 | return; | |
331 | ||
332 | np = inet6_sk(sk); | |
333 | ||
334 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
335 | goto out; | |
336 | ||
337 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
338 | goto out; | |
339 | ||
340 | if (np->recverr) | |
341 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); | |
342 | ||
343 | sk->sk_err = err; | |
344 | sk->sk_error_report(sk); | |
345 | out: | |
346 | sock_put(sk); | |
347 | } | |
348 | ||
ba4e58ec GR |
349 | static __inline__ void udpv6_err(struct sk_buff *skb, |
350 | struct inet6_skb_parm *opt, int type, | |
8e5200f5 | 351 | int code, int offset, __be32 info ) |
ba4e58ec | 352 | { |
645ca708 | 353 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
354 | } |
355 | ||
356 | int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) | |
1da177e4 | 357 | { |
ba4e58ec | 358 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 359 | int rc; |
b2bf1e26 | 360 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 361 | |
ba4e58ec GR |
362 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
363 | goto drop; | |
1da177e4 | 364 | |
ba4e58ec GR |
365 | /* |
366 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
367 | */ | |
b2bf1e26 | 368 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
369 | |
370 | if (up->pcrlen == 0) { /* full coverage was set */ | |
371 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
372 | " %d while full coverage %d requested\n", | |
373 | UDP_SKB_CB(skb)->cscov, skb->len); | |
374 | goto drop; | |
375 | } | |
376 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
377 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
378 | "too small, need min %d\n", | |
379 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
380 | goto drop; | |
381 | } | |
1da177e4 LT |
382 | } |
383 | ||
1ab6eb62 HX |
384 | if (sk->sk_filter) { |
385 | if (udp_lib_checksum_complete(skb)) | |
386 | goto drop; | |
387 | } | |
ba4e58ec | 388 | |
a18135eb DM |
389 | if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { |
390 | /* Note that an ENOMEM error is charged twice */ | |
cb61cb9b | 391 | if (rc == -ENOMEM) { |
ef28d1a2 PE |
392 | UDP6_INC_STATS_BH(sock_net(sk), |
393 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb61cb9b ED |
394 | atomic_inc(&sk->sk_drops); |
395 | } | |
ba4e58ec | 396 | goto drop; |
1da177e4 | 397 | } |
cb75994e | 398 | |
1da177e4 | 399 | return 0; |
ba4e58ec | 400 | drop: |
ef28d1a2 | 401 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
ba4e58ec GR |
402 | kfree_skb(skb); |
403 | return -1; | |
1da177e4 LT |
404 | } |
405 | ||
920a4611 | 406 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
e69a4adc AV |
407 | __be16 loc_port, struct in6_addr *loc_addr, |
408 | __be16 rmt_port, struct in6_addr *rmt_addr, | |
1da177e4 LT |
409 | int dif) |
410 | { | |
88ab1932 | 411 | struct hlist_nulls_node *node; |
1da177e4 LT |
412 | struct sock *s = sk; |
413 | unsigned short num = ntohs(loc_port); | |
414 | ||
88ab1932 | 415 | sk_nulls_for_each_from(s, node) { |
1da177e4 LT |
416 | struct inet_sock *inet = inet_sk(s); |
417 | ||
920a4611 | 418 | if (!net_eq(sock_net(s), net)) |
b8ad0cbc DL |
419 | continue; |
420 | ||
95f30b33 | 421 | if (s->sk_hash == num && s->sk_family == PF_INET6) { |
1da177e4 LT |
422 | struct ipv6_pinfo *np = inet6_sk(s); |
423 | if (inet->dport) { | |
424 | if (inet->dport != rmt_port) | |
425 | continue; | |
426 | } | |
427 | if (!ipv6_addr_any(&np->daddr) && | |
428 | !ipv6_addr_equal(&np->daddr, rmt_addr)) | |
429 | continue; | |
430 | ||
431 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) | |
432 | continue; | |
433 | ||
434 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
40796c5e DS |
435 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
436 | continue; | |
1da177e4 | 437 | } |
add459aa | 438 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
1da177e4 LT |
439 | continue; |
440 | return s; | |
441 | } | |
442 | } | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Note: called only from the BH handler context, | |
448 | * so we don't need to lock the hashes. | |
449 | */ | |
e3163493 PE |
450 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
451 | struct in6_addr *saddr, struct in6_addr *daddr, | |
645ca708 | 452 | struct udp_table *udptable) |
1da177e4 LT |
453 | { |
454 | struct sock *sk, *sk2; | |
4bedb452 | 455 | const struct udphdr *uh = udp_hdr(skb); |
645ca708 | 456 | struct udp_hslot *hslot = &udptable->hash[udp_hashfn(net, ntohs(uh->dest))]; |
1da177e4 LT |
457 | int dif; |
458 | ||
645ca708 | 459 | spin_lock(&hslot->lock); |
88ab1932 | 460 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 461 | dif = inet6_iif(skb); |
920a4611 | 462 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1da177e4 LT |
463 | if (!sk) { |
464 | kfree_skb(skb); | |
465 | goto out; | |
466 | } | |
467 | ||
468 | sk2 = sk; | |
88ab1932 | 469 | while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr, |
1da177e4 LT |
470 | uh->source, saddr, dif))) { |
471 | struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); | |
95766fff | 472 | if (buff) { |
d97106ea | 473 | bh_lock_sock(sk2); |
95766fff HA |
474 | if (!sock_owned_by_user(sk2)) |
475 | udpv6_queue_rcv_skb(sk2, buff); | |
476 | else | |
477 | sk_add_backlog(sk2, buff); | |
478 | bh_unlock_sock(sk2); | |
479 | } | |
1da177e4 | 480 | } |
d97106ea | 481 | bh_lock_sock(sk); |
95766fff HA |
482 | if (!sock_owned_by_user(sk)) |
483 | udpv6_queue_rcv_skb(sk, skb); | |
484 | else | |
485 | sk_add_backlog(sk, skb); | |
486 | bh_unlock_sock(sk); | |
1da177e4 | 487 | out: |
645ca708 | 488 | spin_unlock(&hslot->lock); |
ba4e58ec | 489 | return 0; |
1da177e4 LT |
490 | } |
491 | ||
759e5d00 HX |
492 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
493 | int proto) | |
ba4e58ec | 494 | { |
759e5d00 HX |
495 | int err; |
496 | ||
497 | UDP_SKB_CB(skb)->partial_cov = 0; | |
498 | UDP_SKB_CB(skb)->cscov = skb->len; | |
499 | ||
db8dac20 | 500 | if (proto == IPPROTO_UDPLITE) { |
759e5d00 HX |
501 | err = udplite_checksum_init(skb, uh); |
502 | if (err) | |
503 | return err; | |
504 | } | |
505 | ||
ba4e58ec GR |
506 | if (uh->check == 0) { |
507 | /* RFC 2460 section 8.1 says that we SHOULD log | |
508 | this error. Well, it is reasonable. | |
509 | */ | |
510 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
511 | return 1; | |
512 | } | |
513 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
0660e03f | 514 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
759e5d00 | 515 | skb->len, proto, skb->csum)) |
ba4e58ec GR |
516 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
517 | ||
60476372 | 518 | if (!skb_csum_unnecessary(skb)) |
0660e03f ACM |
519 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
520 | &ipv6_hdr(skb)->daddr, | |
759e5d00 | 521 | skb->len, proto, 0)); |
ba4e58ec | 522 | |
759e5d00 | 523 | return 0; |
ba4e58ec GR |
524 | } |
525 | ||
645ca708 | 526 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 527 | int proto) |
1da177e4 | 528 | { |
1da177e4 | 529 | struct sock *sk; |
1ab1457c | 530 | struct udphdr *uh; |
1da177e4 LT |
531 | struct net_device *dev = skb->dev; |
532 | struct in6_addr *saddr, *daddr; | |
533 | u32 ulen = 0; | |
ef28d1a2 | 534 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
535 | |
536 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
537 | goto short_packet; | |
538 | ||
0660e03f ACM |
539 | saddr = &ipv6_hdr(skb)->saddr; |
540 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 541 | uh = udp_hdr(skb); |
1da177e4 LT |
542 | |
543 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
544 | if (ulen > skb->len) |
545 | goto short_packet; | |
1da177e4 | 546 | |
759e5d00 HX |
547 | if (proto == IPPROTO_UDP) { |
548 | /* UDP validates ulen. */ | |
1da177e4 | 549 | |
ba4e58ec GR |
550 | /* Check for jumbo payload */ |
551 | if (ulen == 0) | |
552 | ulen = skb->len; | |
1da177e4 | 553 | |
ba4e58ec GR |
554 | if (ulen < sizeof(*uh)) |
555 | goto short_packet; | |
1da177e4 | 556 | |
ba4e58ec GR |
557 | if (ulen < skb->len) { |
558 | if (pskb_trim_rcsum(skb, ulen)) | |
559 | goto short_packet; | |
0660e03f ACM |
560 | saddr = &ipv6_hdr(skb)->saddr; |
561 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 562 | uh = udp_hdr(skb); |
ba4e58ec | 563 | } |
ba4e58ec | 564 | } |
1da177e4 | 565 | |
759e5d00 HX |
566 | if (udp6_csum_init(skb, uh, proto)) |
567 | goto discard; | |
568 | ||
1ab1457c YH |
569 | /* |
570 | * Multicast receive code | |
1da177e4 | 571 | */ |
ba4e58ec | 572 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
573 | return __udp6_lib_mcast_deliver(net, skb, |
574 | saddr, daddr, udptable); | |
1da177e4 LT |
575 | |
576 | /* Unicast */ | |
577 | ||
1ab1457c | 578 | /* |
1da177e4 LT |
579 | * check socket cache ... must talk to Alan about his plans |
580 | * for sock caches... i'll skip this for now. | |
581 | */ | |
607c4aaf | 582 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
1da177e4 LT |
583 | |
584 | if (sk == NULL) { | |
585 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
586 | goto discard; | |
587 | ||
ba4e58ec | 588 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 589 | goto discard; |
ef28d1a2 PE |
590 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, |
591 | proto == IPPROTO_UDPLITE); | |
1da177e4 LT |
592 | |
593 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); | |
594 | ||
595 | kfree_skb(skb); | |
add459aa | 596 | return 0; |
1da177e4 | 597 | } |
1ab1457c | 598 | |
1da177e4 | 599 | /* deliver */ |
1ab1457c | 600 | |
d97106ea | 601 | bh_lock_sock(sk); |
95766fff HA |
602 | if (!sock_owned_by_user(sk)) |
603 | udpv6_queue_rcv_skb(sk, skb); | |
604 | else | |
605 | sk_add_backlog(sk, skb); | |
606 | bh_unlock_sock(sk); | |
1da177e4 | 607 | sock_put(sk); |
add459aa | 608 | return 0; |
1da177e4 | 609 | |
1ab1457c | 610 | short_packet: |
ba4e58ec | 611 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", |
db8dac20 | 612 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
759e5d00 | 613 | ulen, skb->len); |
1da177e4 LT |
614 | |
615 | discard: | |
ef28d1a2 | 616 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 617 | kfree_skb(skb); |
add459aa | 618 | return 0; |
1da177e4 | 619 | } |
ba4e58ec | 620 | |
e5bbef20 | 621 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 622 | { |
645ca708 | 623 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
624 | } |
625 | ||
1da177e4 LT |
626 | /* |
627 | * Throw away all pending data and cancel the corking. Socket is locked. | |
628 | */ | |
629 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
630 | { | |
631 | struct udp_sock *up = udp_sk(sk); | |
632 | ||
36d926b9 DL |
633 | if (up->pending == AF_INET) |
634 | udp_flush_pending_frames(sk); | |
635 | else if (up->pending) { | |
1da177e4 LT |
636 | up->len = 0; |
637 | up->pending = 0; | |
638 | ip6_flush_pending_frames(sk); | |
1ab1457c | 639 | } |
1da177e4 LT |
640 | } |
641 | ||
642 | /* | |
643 | * Sending | |
644 | */ | |
645 | ||
4c0a6cb0 | 646 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
647 | { |
648 | struct sk_buff *skb; | |
649 | struct udphdr *uh; | |
4c0a6cb0 | 650 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
651 | struct inet_sock *inet = inet_sk(sk); |
652 | struct flowi *fl = &inet->cork.fl; | |
653 | int err = 0; | |
b2bf1e26 | 654 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 655 | __wsum csum = 0; |
1da177e4 LT |
656 | |
657 | /* Grab the skbuff where UDP header space exists. */ | |
658 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
659 | goto out; | |
660 | ||
661 | /* | |
662 | * Create a UDP header | |
663 | */ | |
4bedb452 | 664 | uh = udp_hdr(skb); |
1da177e4 LT |
665 | uh->source = fl->fl_ip_sport; |
666 | uh->dest = fl->fl_ip_dport; | |
667 | uh->len = htons(up->len); | |
668 | uh->check = 0; | |
669 | ||
b2bf1e26 | 670 | if (is_udplite) |
ba4e58ec GR |
671 | csum = udplite_csum_outgoing(sk, skb); |
672 | else | |
673 | csum = udp_csum_outgoing(sk, skb); | |
1da177e4 | 674 | |
ba4e58ec GR |
675 | /* add protocol-dependent pseudo-header */ |
676 | uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, | |
677 | up->len, fl->proto, csum ); | |
1da177e4 | 678 | if (uh->check == 0) |
f6ab0288 | 679 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 680 | |
1da177e4 LT |
681 | err = ip6_push_pending_frames(sk); |
682 | out: | |
683 | up->len = 0; | |
684 | up->pending = 0; | |
cd562c98 | 685 | if (!err) |
235b9f7a PE |
686 | UDP6_INC_STATS_USER(sock_net(sk), |
687 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
688 | return err; |
689 | } | |
690 | ||
ba4e58ec | 691 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
692 | struct msghdr *msg, size_t len) |
693 | { | |
694 | struct ipv6_txoptions opt_space; | |
695 | struct udp_sock *up = udp_sk(sk); | |
696 | struct inet_sock *inet = inet_sk(sk); | |
697 | struct ipv6_pinfo *np = inet6_sk(sk); | |
698 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
699 | struct in6_addr *daddr, *final_p = NULL, final; | |
700 | struct ipv6_txoptions *opt = NULL; | |
701 | struct ip6_flowlabel *flowlabel = NULL; | |
132a55f3 | 702 | struct flowi fl; |
1da177e4 LT |
703 | struct dst_entry *dst; |
704 | int addr_len = msg->msg_namelen; | |
705 | int ulen = len; | |
706 | int hlimit = -1; | |
41a1f8ea | 707 | int tclass = -1; |
1da177e4 LT |
708 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
709 | int err; | |
987905de | 710 | int connected = 0; |
b2bf1e26 | 711 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 712 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
713 | |
714 | /* destination address check */ | |
715 | if (sin6) { | |
716 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
717 | return -EINVAL; | |
718 | ||
719 | switch (sin6->sin6_family) { | |
720 | case AF_INET6: | |
721 | if (addr_len < SIN6_LEN_RFC2133) | |
722 | return -EINVAL; | |
723 | daddr = &sin6->sin6_addr; | |
724 | break; | |
725 | case AF_INET: | |
726 | goto do_udp_sendmsg; | |
727 | case AF_UNSPEC: | |
728 | msg->msg_name = sin6 = NULL; | |
729 | msg->msg_namelen = addr_len = 0; | |
730 | daddr = NULL; | |
731 | break; | |
732 | default: | |
733 | return -EINVAL; | |
734 | } | |
735 | } else if (!up->pending) { | |
736 | if (sk->sk_state != TCP_ESTABLISHED) | |
737 | return -EDESTADDRREQ; | |
738 | daddr = &np->daddr; | |
1ab1457c | 739 | } else |
1da177e4 LT |
740 | daddr = NULL; |
741 | ||
742 | if (daddr) { | |
e773e4fa | 743 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
744 | struct sockaddr_in sin; |
745 | sin.sin_family = AF_INET; | |
746 | sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; | |
747 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
748 | msg->msg_name = &sin; | |
749 | msg->msg_namelen = sizeof(sin); | |
750 | do_udp_sendmsg: | |
751 | if (__ipv6_only_sock(sk)) | |
752 | return -ENETUNREACH; | |
753 | return udp_sendmsg(iocb, sk, msg, len); | |
754 | } | |
755 | } | |
756 | ||
757 | if (up->pending == AF_INET) | |
758 | return udp_sendmsg(iocb, sk, msg, len); | |
759 | ||
760 | /* Rough check on arithmetic overflow, | |
b59e139b | 761 | better check is made in ip6_append_data(). |
1da177e4 LT |
762 | */ |
763 | if (len > INT_MAX - sizeof(struct udphdr)) | |
764 | return -EMSGSIZE; | |
1ab1457c | 765 | |
1da177e4 LT |
766 | if (up->pending) { |
767 | /* | |
768 | * There are pending frames. | |
769 | * The socket lock must be held while it's corked. | |
770 | */ | |
771 | lock_sock(sk); | |
772 | if (likely(up->pending)) { | |
773 | if (unlikely(up->pending != AF_INET6)) { | |
774 | release_sock(sk); | |
775 | return -EAFNOSUPPORT; | |
776 | } | |
777 | dst = NULL; | |
778 | goto do_append_data; | |
779 | } | |
780 | release_sock(sk); | |
781 | } | |
782 | ulen += sizeof(struct udphdr); | |
783 | ||
132a55f3 | 784 | memset(&fl, 0, sizeof(fl)); |
1da177e4 LT |
785 | |
786 | if (sin6) { | |
787 | if (sin6->sin6_port == 0) | |
788 | return -EINVAL; | |
789 | ||
132a55f3 | 790 | fl.fl_ip_dport = sin6->sin6_port; |
1da177e4 LT |
791 | daddr = &sin6->sin6_addr; |
792 | ||
793 | if (np->sndflow) { | |
132a55f3 HX |
794 | fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
795 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
796 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
797 | if (flowlabel == NULL) |
798 | return -EINVAL; | |
799 | daddr = &flowlabel->dst; | |
800 | } | |
801 | } | |
802 | ||
803 | /* | |
804 | * Otherwise it will be difficult to maintain | |
805 | * sk->sk_dst_cache. | |
806 | */ | |
807 | if (sk->sk_state == TCP_ESTABLISHED && | |
808 | ipv6_addr_equal(daddr, &np->daddr)) | |
809 | daddr = &np->daddr; | |
810 | ||
811 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
812 | sin6->sin6_scope_id && | |
813 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) | |
132a55f3 | 814 | fl.oif = sin6->sin6_scope_id; |
1da177e4 LT |
815 | } else { |
816 | if (sk->sk_state != TCP_ESTABLISHED) | |
817 | return -EDESTADDRREQ; | |
818 | ||
132a55f3 | 819 | fl.fl_ip_dport = inet->dport; |
1da177e4 | 820 | daddr = &np->daddr; |
132a55f3 | 821 | fl.fl6_flowlabel = np->flow_label; |
987905de | 822 | connected = 1; |
1da177e4 LT |
823 | } |
824 | ||
132a55f3 HX |
825 | if (!fl.oif) |
826 | fl.oif = sk->sk_bound_dev_if; | |
1da177e4 | 827 | |
9f690db7 YH |
828 | if (!fl.oif) |
829 | fl.oif = np->sticky_pktinfo.ipi6_ifindex; | |
830 | ||
1da177e4 LT |
831 | if (msg->msg_controllen) { |
832 | opt = &opt_space; | |
833 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
834 | opt->tot_len = sizeof(*opt); | |
835 | ||
91e1908f | 836 | err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); |
1da177e4 LT |
837 | if (err < 0) { |
838 | fl6_sock_release(flowlabel); | |
839 | return err; | |
840 | } | |
132a55f3 HX |
841 | if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
842 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
843 | if (flowlabel == NULL) |
844 | return -EINVAL; | |
845 | } | |
846 | if (!(opt->opt_nflen|opt->opt_flen)) | |
847 | opt = NULL; | |
987905de | 848 | connected = 0; |
1da177e4 LT |
849 | } |
850 | if (opt == NULL) | |
851 | opt = np->opt; | |
df9890c3 YH |
852 | if (flowlabel) |
853 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
854 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 855 | |
ba4e58ec | 856 | fl.proto = sk->sk_protocol; |
876c7f41 BH |
857 | if (!ipv6_addr_any(daddr)) |
858 | ipv6_addr_copy(&fl.fl6_dst, daddr); | |
859 | else | |
860 | fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
132a55f3 HX |
861 | if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
862 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
863 | fl.fl_ip_sport = inet->sport; | |
1ab1457c | 864 | |
1da177e4 LT |
865 | /* merge ip6_build_xmit from ip6_output */ |
866 | if (opt && opt->srcrt) { | |
867 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
132a55f3 HX |
868 | ipv6_addr_copy(&final, &fl.fl6_dst); |
869 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1da177e4 | 870 | final_p = &final; |
987905de | 871 | connected = 0; |
1da177e4 LT |
872 | } |
873 | ||
132a55f3 HX |
874 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { |
875 | fl.oif = np->mcast_oif; | |
987905de MK |
876 | connected = 0; |
877 | } | |
1da177e4 | 878 | |
132a55f3 | 879 | security_sk_classify_flow(sk, &fl); |
beb8d13b | 880 | |
132a55f3 | 881 | err = ip6_sk_dst_lookup(sk, &dst, &fl); |
1da177e4 LT |
882 | if (err) |
883 | goto out; | |
884 | if (final_p) | |
132a55f3 | 885 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
1da177e4 | 886 | |
52479b62 AD |
887 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
888 | if (err < 0) { | |
14e50e57 DM |
889 | if (err == -EREMOTE) |
890 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
891 | if (err < 0) | |
892 | goto out; | |
893 | } | |
1da177e4 LT |
894 | |
895 | if (hlimit < 0) { | |
132a55f3 | 896 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
1da177e4 LT |
897 | hlimit = np->mcast_hops; |
898 | else | |
899 | hlimit = np->hop_limit; | |
900 | if (hlimit < 0) | |
6b75d090 | 901 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 LT |
902 | } |
903 | ||
41a1f8ea YH |
904 | if (tclass < 0) { |
905 | tclass = np->tclass; | |
906 | if (tclass < 0) | |
907 | tclass = 0; | |
908 | } | |
909 | ||
1da177e4 LT |
910 | if (msg->msg_flags&MSG_CONFIRM) |
911 | goto do_confirm; | |
912 | back_from_confirm: | |
913 | ||
914 | lock_sock(sk); | |
915 | if (unlikely(up->pending)) { | |
916 | /* The socket is already corked while preparing it. */ | |
917 | /* ... which is an evident application bug. --ANK */ | |
918 | release_sock(sk); | |
919 | ||
64ce2073 | 920 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
921 | err = -EINVAL; |
922 | goto out; | |
923 | } | |
924 | ||
925 | up->pending = AF_INET6; | |
926 | ||
927 | do_append_data: | |
928 | up->len += ulen; | |
ba4e58ec GR |
929 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
930 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
132a55f3 | 931 | sizeof(struct udphdr), hlimit, tclass, opt, &fl, |
41a1f8ea YH |
932 | (struct rt6_info*)dst, |
933 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
1da177e4 LT |
934 | if (err) |
935 | udp_v6_flush_pending_frames(sk); | |
936 | else if (!corkreq) | |
4c0a6cb0 | 937 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
938 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
939 | up->pending = 0; | |
1da177e4 | 940 | |
a5e7c210 DM |
941 | if (dst) { |
942 | if (connected) { | |
943 | ip6_dst_store(sk, dst, | |
132a55f3 | 944 | ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
8e1ef0a9 YH |
945 | &np->daddr : NULL, |
946 | #ifdef CONFIG_IPV6_SUBTREES | |
132a55f3 | 947 | ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
8e1ef0a9 YH |
948 | &np->saddr : |
949 | #endif | |
950 | NULL); | |
a5e7c210 DM |
951 | } else { |
952 | dst_release(dst); | |
953 | } | |
a3c96089 | 954 | dst = NULL; |
a5e7c210 DM |
955 | } |
956 | ||
1da177e4 LT |
957 | if (err > 0) |
958 | err = np->recverr ? net_xmit_errno(err) : 0; | |
959 | release_sock(sk); | |
960 | out: | |
a3c96089 | 961 | dst_release(dst); |
1da177e4 | 962 | fl6_sock_release(flowlabel); |
cd562c98 | 963 | if (!err) |
1da177e4 | 964 | return len; |
a18135eb DM |
965 | /* |
966 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
967 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
968 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
969 | * things). We could add another new stat but at least for now that | |
970 | * seems like overkill. | |
971 | */ | |
972 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
973 | UDP6_INC_STATS_USER(sock_net(sk), |
974 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 975 | } |
1da177e4 LT |
976 | return err; |
977 | ||
978 | do_confirm: | |
979 | dst_confirm(dst); | |
980 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
981 | goto back_from_confirm; | |
982 | err = 0; | |
983 | goto out; | |
984 | } | |
985 | ||
7d06b2e0 | 986 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 LT |
987 | { |
988 | lock_sock(sk); | |
989 | udp_v6_flush_pending_frames(sk); | |
990 | release_sock(sk); | |
991 | ||
992 | inet6_destroy_sock(sk); | |
1da177e4 LT |
993 | } |
994 | ||
995 | /* | |
996 | * Socket option code for UDP | |
997 | */ | |
ba4e58ec GR |
998 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
999 | char __user *optval, int optlen) | |
3fdadf7d | 1000 | { |
db8dac20 | 1001 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1002 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1003 | udp_v6_push_pending_frames); | |
ba4e58ec | 1004 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1005 | } |
1006 | ||
1007 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1008 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
1009 | char __user *optval, int optlen) | |
3fdadf7d | 1010 | { |
db8dac20 | 1011 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1012 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1013 | udp_v6_push_pending_frames); | |
ba4e58ec | 1014 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1015 | } |
1016 | #endif | |
1017 | ||
ba4e58ec GR |
1018 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1019 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1020 | { |
db8dac20 | 1021 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1022 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1023 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1024 | } |
1025 | ||
1026 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1027 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1028 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1029 | { |
db8dac20 | 1030 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1031 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1032 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1033 | } |
1034 | #endif | |
1035 | ||
1da177e4 LT |
1036 | static struct inet6_protocol udpv6_protocol = { |
1037 | .handler = udpv6_rcv, | |
1038 | .err_handler = udpv6_err, | |
1039 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1040 | }; | |
1041 | ||
1042 | /* ------------------------------------------------------------------------ */ | |
1043 | #ifdef CONFIG_PROC_FS | |
1044 | ||
1045 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) | |
1046 | { | |
1047 | struct inet_sock *inet = inet_sk(sp); | |
1048 | struct ipv6_pinfo *np = inet6_sk(sp); | |
1049 | struct in6_addr *dest, *src; | |
1050 | __u16 destp, srcp; | |
1051 | ||
1052 | dest = &np->daddr; | |
1053 | src = &np->rcv_saddr; | |
1054 | destp = ntohs(inet->dport); | |
1055 | srcp = ntohs(inet->sport); | |
1056 | seq_printf(seq, | |
1057 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
cb61cb9b | 1058 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
1da177e4 LT |
1059 | bucket, |
1060 | src->s6_addr32[0], src->s6_addr32[1], | |
1061 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1062 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1063 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1064 | sp->sk_state, |
1da177e4 LT |
1065 | atomic_read(&sp->sk_wmem_alloc), |
1066 | atomic_read(&sp->sk_rmem_alloc), | |
1067 | 0, 0L, 0, | |
1068 | sock_i_uid(sp), 0, | |
1069 | sock_i_ino(sp), | |
cb61cb9b ED |
1070 | atomic_read(&sp->sk_refcnt), sp, |
1071 | atomic_read(&sp->sk_drops)); | |
1da177e4 LT |
1072 | } |
1073 | ||
ba4e58ec | 1074 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1075 | { |
1076 | if (v == SEQ_START_TOKEN) | |
1077 | seq_printf(seq, | |
1078 | " sl " | |
1079 | "local_address " | |
1080 | "remote_address " | |
1081 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
cb61cb9b | 1082 | " uid timeout inode ref pointer drops\n"); |
1da177e4 LT |
1083 | else |
1084 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1da177e4 | 1088 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1089 | .name = "udp6", |
1090 | .family = AF_INET6, | |
645ca708 | 1091 | .udp_table = &udp_table, |
4ad96d39 DL |
1092 | .seq_fops = { |
1093 | .owner = THIS_MODULE, | |
1094 | }, | |
dda61925 DL |
1095 | .seq_ops = { |
1096 | .show = udp6_seq_show, | |
1097 | }, | |
1da177e4 LT |
1098 | }; |
1099 | ||
0c96d8c5 | 1100 | int udp6_proc_init(struct net *net) |
1da177e4 | 1101 | { |
0c96d8c5 | 1102 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1103 | } |
1104 | ||
0c96d8c5 DL |
1105 | void udp6_proc_exit(struct net *net) { |
1106 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1107 | } |
1108 | #endif /* CONFIG_PROC_FS */ | |
1109 | ||
1110 | /* ------------------------------------------------------------------------ */ | |
1111 | ||
1112 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1113 | .name = "UDPv6", |
1114 | .owner = THIS_MODULE, | |
ba4e58ec | 1115 | .close = udp_lib_close, |
543d9cfe ACM |
1116 | .connect = ip6_datagram_connect, |
1117 | .disconnect = udp_disconnect, | |
1118 | .ioctl = udp_ioctl, | |
1119 | .destroy = udpv6_destroy_sock, | |
1120 | .setsockopt = udpv6_setsockopt, | |
1121 | .getsockopt = udpv6_getsockopt, | |
1122 | .sendmsg = udpv6_sendmsg, | |
1123 | .recvmsg = udpv6_recvmsg, | |
1124 | .backlog_rcv = udpv6_queue_rcv_skb, | |
ba4e58ec GR |
1125 | .hash = udp_lib_hash, |
1126 | .unhash = udp_lib_unhash, | |
543d9cfe | 1127 | .get_port = udp_v6_get_port, |
95766fff HA |
1128 | .memory_allocated = &udp_memory_allocated, |
1129 | .sysctl_mem = sysctl_udp_mem, | |
1130 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1131 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1132 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1133 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1134 | .h.udp_table = &udp_table, |
3fdadf7d | 1135 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1136 | .compat_setsockopt = compat_udpv6_setsockopt, |
1137 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1138 | #endif |
1da177e4 LT |
1139 | }; |
1140 | ||
1da177e4 LT |
1141 | static struct inet_protosw udpv6_protosw = { |
1142 | .type = SOCK_DGRAM, | |
1143 | .protocol = IPPROTO_UDP, | |
1144 | .prot = &udpv6_prot, | |
1145 | .ops = &inet6_dgram_ops, | |
1146 | .capability =-1, | |
1147 | .no_check = UDP_CSUM_DEFAULT, | |
1148 | .flags = INET_PROTOSW_PERMANENT, | |
1149 | }; | |
1150 | ||
1151 | ||
7f4e4868 | 1152 | int __init udpv6_init(void) |
1da177e4 | 1153 | { |
7f4e4868 DL |
1154 | int ret; |
1155 | ||
1156 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1157 | if (ret) | |
1158 | goto out; | |
1159 | ||
1160 | ret = inet6_register_protosw(&udpv6_protosw); | |
1161 | if (ret) | |
1162 | goto out_udpv6_protocol; | |
1163 | out: | |
1164 | return ret; | |
1165 | ||
1166 | out_udpv6_protocol: | |
1167 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1168 | goto out; | |
1169 | } | |
1170 | ||
09f7709f | 1171 | void udpv6_exit(void) |
7f4e4868 DL |
1172 | { |
1173 | inet6_unregister_protosw(&udpv6_protosw); | |
1174 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1175 | } |