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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); | |
c720c7e8 | 56 | __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr; |
499923c7 | 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 | 65 | return (!sk2_ipv6only && |
c720c7e8 ED |
66 | (!sk1_rcv_saddr || !sk2_rcv_saddr || |
67 | sk1_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; | |
c720c7e8 ED |
103 | if (inet->inet_dport) { |
104 | if (inet->inet_dport != sport) | |
645ca708 ED |
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); |
f86dcc5a | 135 | unsigned int hash = udp_hashfn(net, hnum, udptable->mask); |
645ca708 | 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; | |
adf30907 ED |
180 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
181 | &iph->daddr, dport, inet6_iif(skb), | |
182 | udptable); | |
607c4aaf KK |
183 | } |
184 | ||
1da177e4 LT |
185 | /* |
186 | * This should be easy, if there is something there we | |
187 | * return it, otherwise we block. | |
188 | */ | |
189 | ||
ba4e58ec | 190 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
191 | struct msghdr *msg, size_t len, |
192 | int noblock, int flags, int *addr_len) | |
193 | { | |
194 | struct ipv6_pinfo *np = inet6_sk(sk); | |
195 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 196 | struct sk_buff *skb; |
759e5d00 | 197 | unsigned int ulen, copied; |
a59322be | 198 | int peeked; |
759e5d00 HX |
199 | int err; |
200 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 201 | int is_udp4; |
1da177e4 | 202 | |
1ab1457c YH |
203 | if (addr_len) |
204 | *addr_len=sizeof(struct sockaddr_in6); | |
205 | ||
1da177e4 LT |
206 | if (flags & MSG_ERRQUEUE) |
207 | return ipv6_recv_error(sk, msg, len); | |
208 | ||
209 | try_again: | |
a59322be HX |
210 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
211 | &peeked, &err); | |
1da177e4 LT |
212 | if (!skb) |
213 | goto out; | |
214 | ||
759e5d00 HX |
215 | ulen = skb->len - sizeof(struct udphdr); |
216 | copied = len; | |
217 | if (copied > ulen) | |
218 | copied = ulen; | |
219 | else if (copied < ulen) | |
1ab1457c | 220 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 221 | |
f26ba175 WY |
222 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
223 | ||
ba4e58ec | 224 | /* |
759e5d00 HX |
225 | * If checksum is needed at all, try to do it while copying the |
226 | * data. If the data is truncated, or if we only want a partial | |
227 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 228 | */ |
ba4e58ec | 229 | |
759e5d00 HX |
230 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
231 | if (udp_lib_checksum_complete(skb)) | |
1da177e4 | 232 | goto csum_copy_err; |
ba4e58ec GR |
233 | } |
234 | ||
60476372 | 235 | if (skb_csum_unnecessary(skb)) |
ba4e58ec GR |
236 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
237 | msg->msg_iov, copied ); | |
238 | else { | |
1da177e4 LT |
239 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
240 | if (err == -EINVAL) | |
241 | goto csum_copy_err; | |
242 | } | |
243 | if (err) | |
244 | goto out_free; | |
245 | ||
f26ba175 WY |
246 | if (!peeked) { |
247 | if (is_udp4) | |
248 | UDP_INC_STATS_USER(sock_net(sk), | |
249 | UDP_MIB_INDATAGRAMS, is_udplite); | |
250 | else | |
251 | UDP6_INC_STATS_USER(sock_net(sk), | |
252 | UDP_MIB_INDATAGRAMS, is_udplite); | |
253 | } | |
cb75994e | 254 | |
3b885787 | 255 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
256 | |
257 | /* Copy the address. */ | |
258 | if (msg->msg_name) { | |
259 | struct sockaddr_in6 *sin6; | |
1ab1457c | 260 | |
1da177e4 LT |
261 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
262 | sin6->sin6_family = AF_INET6; | |
4bedb452 | 263 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 LT |
264 | sin6->sin6_flowinfo = 0; |
265 | sin6->sin6_scope_id = 0; | |
266 | ||
f26ba175 | 267 | if (is_udp4) |
b301e82c BH |
268 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
269 | &sin6->sin6_addr); | |
1da177e4 | 270 | else { |
0660e03f ACM |
271 | ipv6_addr_copy(&sin6->sin6_addr, |
272 | &ipv6_hdr(skb)->saddr); | |
1da177e4 LT |
273 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
274 | sin6->sin6_scope_id = IP6CB(skb)->iif; | |
275 | } | |
276 | ||
277 | } | |
f26ba175 | 278 | if (is_udp4) { |
1da177e4 LT |
279 | if (inet->cmsg_flags) |
280 | ip_cmsg_recv(msg, skb); | |
281 | } else { | |
282 | if (np->rxopt.all) | |
283 | datagram_recv_ctl(sk, msg, skb); | |
1ab1457c | 284 | } |
1da177e4 LT |
285 | |
286 | err = copied; | |
287 | if (flags & MSG_TRUNC) | |
759e5d00 | 288 | err = ulen; |
1da177e4 LT |
289 | |
290 | out_free: | |
9d410c79 | 291 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
292 | out: |
293 | return err; | |
294 | ||
295 | csum_copy_err: | |
95766fff | 296 | lock_sock(sk); |
0856f939 WY |
297 | if (!skb_kill_datagram(sk, skb, flags)) { |
298 | if (is_udp4) | |
299 | UDP_INC_STATS_USER(sock_net(sk), | |
300 | UDP_MIB_INERRORS, is_udplite); | |
301 | else | |
302 | UDP6_INC_STATS_USER(sock_net(sk), | |
303 | UDP_MIB_INERRORS, is_udplite); | |
304 | } | |
95766fff | 305 | release_sock(sk); |
1da177e4 | 306 | |
7a0ff716 | 307 | if (flags & MSG_DONTWAIT) |
1da177e4 | 308 | return -EAGAIN; |
1da177e4 LT |
309 | goto try_again; |
310 | } | |
311 | ||
ba4e58ec | 312 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 313 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 314 | struct udp_table *udptable) |
1da177e4 LT |
315 | { |
316 | struct ipv6_pinfo *np; | |
317 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
1da177e4 LT |
318 | struct in6_addr *saddr = &hdr->saddr; |
319 | struct in6_addr *daddr = &hdr->daddr; | |
320 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); | |
321 | struct sock *sk; | |
322 | int err; | |
323 | ||
c346dca1 | 324 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 325 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
326 | if (sk == NULL) |
327 | return; | |
328 | ||
329 | np = inet6_sk(sk); | |
330 | ||
331 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
332 | goto out; | |
333 | ||
334 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
335 | goto out; | |
336 | ||
337 | if (np->recverr) | |
338 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); | |
339 | ||
340 | sk->sk_err = err; | |
341 | sk->sk_error_report(sk); | |
342 | out: | |
343 | sock_put(sk); | |
344 | } | |
345 | ||
ba4e58ec | 346 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba BH |
347 | struct inet6_skb_parm *opt, u8 type, |
348 | u8 code, int offset, __be32 info ) | |
ba4e58ec | 349 | { |
645ca708 | 350 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
351 | } |
352 | ||
353 | int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) | |
1da177e4 | 354 | { |
ba4e58ec | 355 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 356 | int rc; |
b2bf1e26 | 357 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 358 | |
ba4e58ec GR |
359 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
360 | goto drop; | |
1da177e4 | 361 | |
ba4e58ec GR |
362 | /* |
363 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
364 | */ | |
b2bf1e26 | 365 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
366 | |
367 | if (up->pcrlen == 0) { /* full coverage was set */ | |
368 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
369 | " %d while full coverage %d requested\n", | |
370 | UDP_SKB_CB(skb)->cscov, skb->len); | |
371 | goto drop; | |
372 | } | |
373 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
374 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
375 | "too small, need min %d\n", | |
376 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
377 | goto drop; | |
378 | } | |
1da177e4 LT |
379 | } |
380 | ||
1ab6eb62 HX |
381 | if (sk->sk_filter) { |
382 | if (udp_lib_checksum_complete(skb)) | |
383 | goto drop; | |
384 | } | |
ba4e58ec | 385 | |
766e9037 | 386 | if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) { |
a18135eb | 387 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 388 | if (rc == -ENOMEM) |
ef28d1a2 PE |
389 | UDP6_INC_STATS_BH(sock_net(sk), |
390 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
8edf19c2 | 391 | goto drop_no_sk_drops_inc; |
1da177e4 | 392 | } |
cb75994e | 393 | |
1da177e4 | 394 | return 0; |
ba4e58ec | 395 | drop: |
8edf19c2 ED |
396 | atomic_inc(&sk->sk_drops); |
397 | drop_no_sk_drops_inc: | |
ef28d1a2 | 398 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
ba4e58ec GR |
399 | kfree_skb(skb); |
400 | return -1; | |
1da177e4 LT |
401 | } |
402 | ||
920a4611 | 403 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
e69a4adc AV |
404 | __be16 loc_port, struct in6_addr *loc_addr, |
405 | __be16 rmt_port, struct in6_addr *rmt_addr, | |
1da177e4 LT |
406 | int dif) |
407 | { | |
88ab1932 | 408 | struct hlist_nulls_node *node; |
1da177e4 LT |
409 | struct sock *s = sk; |
410 | unsigned short num = ntohs(loc_port); | |
411 | ||
88ab1932 | 412 | sk_nulls_for_each_from(s, node) { |
1da177e4 LT |
413 | struct inet_sock *inet = inet_sk(s); |
414 | ||
920a4611 | 415 | if (!net_eq(sock_net(s), net)) |
b8ad0cbc DL |
416 | continue; |
417 | ||
95f30b33 | 418 | if (s->sk_hash == num && s->sk_family == PF_INET6) { |
1da177e4 | 419 | struct ipv6_pinfo *np = inet6_sk(s); |
c720c7e8 ED |
420 | if (inet->inet_dport) { |
421 | if (inet->inet_dport != rmt_port) | |
1da177e4 LT |
422 | continue; |
423 | } | |
424 | if (!ipv6_addr_any(&np->daddr) && | |
425 | !ipv6_addr_equal(&np->daddr, rmt_addr)) | |
426 | continue; | |
427 | ||
428 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) | |
429 | continue; | |
430 | ||
431 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
40796c5e DS |
432 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
433 | continue; | |
1da177e4 | 434 | } |
add459aa | 435 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
1da177e4 LT |
436 | continue; |
437 | return s; | |
438 | } | |
439 | } | |
440 | return NULL; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Note: called only from the BH handler context, | |
445 | * so we don't need to lock the hashes. | |
446 | */ | |
e3163493 PE |
447 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
448 | struct in6_addr *saddr, struct in6_addr *daddr, | |
645ca708 | 449 | struct udp_table *udptable) |
1da177e4 LT |
450 | { |
451 | struct sock *sk, *sk2; | |
4bedb452 | 452 | const struct udphdr *uh = udp_hdr(skb); |
f86dcc5a | 453 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
1da177e4 LT |
454 | int dif; |
455 | ||
645ca708 | 456 | spin_lock(&hslot->lock); |
88ab1932 | 457 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 458 | dif = inet6_iif(skb); |
920a4611 | 459 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1da177e4 LT |
460 | if (!sk) { |
461 | kfree_skb(skb); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | sk2 = sk; | |
88ab1932 | 466 | while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr, |
1da177e4 LT |
467 | uh->source, saddr, dif))) { |
468 | struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); | |
95766fff | 469 | if (buff) { |
d97106ea | 470 | bh_lock_sock(sk2); |
95766fff HA |
471 | if (!sock_owned_by_user(sk2)) |
472 | udpv6_queue_rcv_skb(sk2, buff); | |
473 | else | |
474 | sk_add_backlog(sk2, buff); | |
475 | bh_unlock_sock(sk2); | |
476 | } | |
1da177e4 | 477 | } |
d97106ea | 478 | bh_lock_sock(sk); |
95766fff HA |
479 | if (!sock_owned_by_user(sk)) |
480 | udpv6_queue_rcv_skb(sk, skb); | |
481 | else | |
482 | sk_add_backlog(sk, skb); | |
483 | bh_unlock_sock(sk); | |
1da177e4 | 484 | out: |
645ca708 | 485 | spin_unlock(&hslot->lock); |
ba4e58ec | 486 | return 0; |
1da177e4 LT |
487 | } |
488 | ||
759e5d00 HX |
489 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
490 | int proto) | |
ba4e58ec | 491 | { |
759e5d00 HX |
492 | int err; |
493 | ||
494 | UDP_SKB_CB(skb)->partial_cov = 0; | |
495 | UDP_SKB_CB(skb)->cscov = skb->len; | |
496 | ||
db8dac20 | 497 | if (proto == IPPROTO_UDPLITE) { |
759e5d00 HX |
498 | err = udplite_checksum_init(skb, uh); |
499 | if (err) | |
500 | return err; | |
501 | } | |
502 | ||
ba4e58ec GR |
503 | if (uh->check == 0) { |
504 | /* RFC 2460 section 8.1 says that we SHOULD log | |
505 | this error. Well, it is reasonable. | |
506 | */ | |
507 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
508 | return 1; | |
509 | } | |
510 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
0660e03f | 511 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
759e5d00 | 512 | skb->len, proto, skb->csum)) |
ba4e58ec GR |
513 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
514 | ||
60476372 | 515 | if (!skb_csum_unnecessary(skb)) |
0660e03f ACM |
516 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
517 | &ipv6_hdr(skb)->daddr, | |
759e5d00 | 518 | skb->len, proto, 0)); |
ba4e58ec | 519 | |
759e5d00 | 520 | return 0; |
ba4e58ec GR |
521 | } |
522 | ||
645ca708 | 523 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 524 | int proto) |
1da177e4 | 525 | { |
1da177e4 | 526 | struct sock *sk; |
1ab1457c | 527 | struct udphdr *uh; |
1da177e4 LT |
528 | struct net_device *dev = skb->dev; |
529 | struct in6_addr *saddr, *daddr; | |
530 | u32 ulen = 0; | |
ef28d1a2 | 531 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
532 | |
533 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
534 | goto short_packet; | |
535 | ||
0660e03f ACM |
536 | saddr = &ipv6_hdr(skb)->saddr; |
537 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 538 | uh = udp_hdr(skb); |
1da177e4 LT |
539 | |
540 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
541 | if (ulen > skb->len) |
542 | goto short_packet; | |
1da177e4 | 543 | |
759e5d00 HX |
544 | if (proto == IPPROTO_UDP) { |
545 | /* UDP validates ulen. */ | |
1da177e4 | 546 | |
ba4e58ec GR |
547 | /* Check for jumbo payload */ |
548 | if (ulen == 0) | |
549 | ulen = skb->len; | |
1da177e4 | 550 | |
ba4e58ec GR |
551 | if (ulen < sizeof(*uh)) |
552 | goto short_packet; | |
1da177e4 | 553 | |
ba4e58ec GR |
554 | if (ulen < skb->len) { |
555 | if (pskb_trim_rcsum(skb, ulen)) | |
556 | goto short_packet; | |
0660e03f ACM |
557 | saddr = &ipv6_hdr(skb)->saddr; |
558 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 559 | uh = udp_hdr(skb); |
ba4e58ec | 560 | } |
ba4e58ec | 561 | } |
1da177e4 | 562 | |
759e5d00 HX |
563 | if (udp6_csum_init(skb, uh, proto)) |
564 | goto discard; | |
565 | ||
1ab1457c YH |
566 | /* |
567 | * Multicast receive code | |
1da177e4 | 568 | */ |
ba4e58ec | 569 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
570 | return __udp6_lib_mcast_deliver(net, skb, |
571 | saddr, daddr, udptable); | |
1da177e4 LT |
572 | |
573 | /* Unicast */ | |
574 | ||
1ab1457c | 575 | /* |
1da177e4 LT |
576 | * check socket cache ... must talk to Alan about his plans |
577 | * for sock caches... i'll skip this for now. | |
578 | */ | |
607c4aaf | 579 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
1da177e4 LT |
580 | |
581 | if (sk == NULL) { | |
582 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
583 | goto discard; | |
584 | ||
ba4e58ec | 585 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 586 | goto discard; |
ef28d1a2 PE |
587 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, |
588 | proto == IPPROTO_UDPLITE); | |
1da177e4 LT |
589 | |
590 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); | |
591 | ||
592 | kfree_skb(skb); | |
add459aa | 593 | return 0; |
1da177e4 | 594 | } |
1ab1457c | 595 | |
1da177e4 | 596 | /* deliver */ |
1ab1457c | 597 | |
d97106ea | 598 | bh_lock_sock(sk); |
95766fff HA |
599 | if (!sock_owned_by_user(sk)) |
600 | udpv6_queue_rcv_skb(sk, skb); | |
601 | else | |
602 | sk_add_backlog(sk, skb); | |
603 | bh_unlock_sock(sk); | |
1da177e4 | 604 | sock_put(sk); |
add459aa | 605 | return 0; |
1da177e4 | 606 | |
1ab1457c | 607 | short_packet: |
ba4e58ec | 608 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", |
db8dac20 | 609 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
759e5d00 | 610 | ulen, skb->len); |
1da177e4 LT |
611 | |
612 | discard: | |
ef28d1a2 | 613 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 614 | kfree_skb(skb); |
add459aa | 615 | return 0; |
1da177e4 | 616 | } |
ba4e58ec | 617 | |
e5bbef20 | 618 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 619 | { |
645ca708 | 620 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
621 | } |
622 | ||
1da177e4 LT |
623 | /* |
624 | * Throw away all pending data and cancel the corking. Socket is locked. | |
625 | */ | |
626 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
627 | { | |
628 | struct udp_sock *up = udp_sk(sk); | |
629 | ||
36d926b9 DL |
630 | if (up->pending == AF_INET) |
631 | udp_flush_pending_frames(sk); | |
632 | else if (up->pending) { | |
1da177e4 LT |
633 | up->len = 0; |
634 | up->pending = 0; | |
635 | ip6_flush_pending_frames(sk); | |
1ab1457c | 636 | } |
1da177e4 LT |
637 | } |
638 | ||
493c6be3 SS |
639 | /** |
640 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming | |
641 | * @sk: socket we are sending on | |
642 | * @skb: sk_buff containing the filled-in UDP header | |
643 | * (checksum field must be zeroed out) | |
644 | */ | |
645 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
646 | const struct in6_addr *saddr, | |
647 | const struct in6_addr *daddr, int len) | |
648 | { | |
649 | unsigned int offset; | |
650 | struct udphdr *uh = udp_hdr(skb); | |
651 | __wsum csum = 0; | |
652 | ||
653 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
654 | /* Only one fragment on the socket. */ | |
655 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
656 | skb->csum_offset = offsetof(struct udphdr, check); | |
657 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
658 | } else { | |
659 | /* | |
660 | * HW-checksum won't work as there are two or more | |
661 | * fragments on the socket so that all csums of sk_buffs | |
662 | * should be together | |
663 | */ | |
664 | offset = skb_transport_offset(skb); | |
665 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
666 | ||
667 | skb->ip_summed = CHECKSUM_NONE; | |
668 | ||
669 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
670 | csum = csum_add(csum, skb->csum); | |
671 | } | |
672 | ||
673 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
674 | csum); | |
675 | if (uh->check == 0) | |
676 | uh->check = CSUM_MANGLED_0; | |
677 | } | |
678 | } | |
679 | ||
1da177e4 LT |
680 | /* |
681 | * Sending | |
682 | */ | |
683 | ||
4c0a6cb0 | 684 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
685 | { |
686 | struct sk_buff *skb; | |
687 | struct udphdr *uh; | |
4c0a6cb0 | 688 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
689 | struct inet_sock *inet = inet_sk(sk); |
690 | struct flowi *fl = &inet->cork.fl; | |
691 | int err = 0; | |
b2bf1e26 | 692 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 693 | __wsum csum = 0; |
1da177e4 LT |
694 | |
695 | /* Grab the skbuff where UDP header space exists. */ | |
696 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
697 | goto out; | |
698 | ||
699 | /* | |
700 | * Create a UDP header | |
701 | */ | |
4bedb452 | 702 | uh = udp_hdr(skb); |
1da177e4 LT |
703 | uh->source = fl->fl_ip_sport; |
704 | uh->dest = fl->fl_ip_dport; | |
705 | uh->len = htons(up->len); | |
706 | uh->check = 0; | |
707 | ||
b2bf1e26 | 708 | if (is_udplite) |
ba4e58ec | 709 | csum = udplite_csum_outgoing(sk, skb); |
493c6be3 SS |
710 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
711 | udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, | |
712 | up->len); | |
713 | goto send; | |
714 | } else | |
ba4e58ec | 715 | csum = udp_csum_outgoing(sk, skb); |
1da177e4 | 716 | |
ba4e58ec GR |
717 | /* add protocol-dependent pseudo-header */ |
718 | uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, | |
719 | up->len, fl->proto, csum ); | |
1da177e4 | 720 | if (uh->check == 0) |
f6ab0288 | 721 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 722 | |
493c6be3 | 723 | send: |
1da177e4 | 724 | err = ip6_push_pending_frames(sk); |
6ce9e7b5 ED |
725 | if (err) { |
726 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
727 | UDP6_INC_STATS_USER(sock_net(sk), | |
728 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
729 | err = 0; | |
730 | } | |
731 | } else | |
732 | UDP6_INC_STATS_USER(sock_net(sk), | |
733 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
734 | out: |
735 | up->len = 0; | |
736 | up->pending = 0; | |
737 | return err; | |
738 | } | |
739 | ||
ba4e58ec | 740 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
741 | struct msghdr *msg, size_t len) |
742 | { | |
743 | struct ipv6_txoptions opt_space; | |
744 | struct udp_sock *up = udp_sk(sk); | |
745 | struct inet_sock *inet = inet_sk(sk); | |
746 | struct ipv6_pinfo *np = inet6_sk(sk); | |
747 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
748 | struct in6_addr *daddr, *final_p = NULL, final; | |
749 | struct ipv6_txoptions *opt = NULL; | |
750 | struct ip6_flowlabel *flowlabel = NULL; | |
132a55f3 | 751 | struct flowi fl; |
1da177e4 LT |
752 | struct dst_entry *dst; |
753 | int addr_len = msg->msg_namelen; | |
754 | int ulen = len; | |
755 | int hlimit = -1; | |
41a1f8ea | 756 | int tclass = -1; |
1da177e4 LT |
757 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
758 | int err; | |
987905de | 759 | int connected = 0; |
b2bf1e26 | 760 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 761 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
762 | |
763 | /* destination address check */ | |
764 | if (sin6) { | |
765 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
766 | return -EINVAL; | |
767 | ||
768 | switch (sin6->sin6_family) { | |
769 | case AF_INET6: | |
770 | if (addr_len < SIN6_LEN_RFC2133) | |
771 | return -EINVAL; | |
772 | daddr = &sin6->sin6_addr; | |
773 | break; | |
774 | case AF_INET: | |
775 | goto do_udp_sendmsg; | |
776 | case AF_UNSPEC: | |
777 | msg->msg_name = sin6 = NULL; | |
778 | msg->msg_namelen = addr_len = 0; | |
779 | daddr = NULL; | |
780 | break; | |
781 | default: | |
782 | return -EINVAL; | |
783 | } | |
784 | } else if (!up->pending) { | |
785 | if (sk->sk_state != TCP_ESTABLISHED) | |
786 | return -EDESTADDRREQ; | |
787 | daddr = &np->daddr; | |
1ab1457c | 788 | } else |
1da177e4 LT |
789 | daddr = NULL; |
790 | ||
791 | if (daddr) { | |
e773e4fa | 792 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
793 | struct sockaddr_in sin; |
794 | sin.sin_family = AF_INET; | |
c720c7e8 | 795 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
796 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
797 | msg->msg_name = &sin; | |
798 | msg->msg_namelen = sizeof(sin); | |
799 | do_udp_sendmsg: | |
800 | if (__ipv6_only_sock(sk)) | |
801 | return -ENETUNREACH; | |
802 | return udp_sendmsg(iocb, sk, msg, len); | |
803 | } | |
804 | } | |
805 | ||
806 | if (up->pending == AF_INET) | |
807 | return udp_sendmsg(iocb, sk, msg, len); | |
808 | ||
809 | /* Rough check on arithmetic overflow, | |
b59e139b | 810 | better check is made in ip6_append_data(). |
1da177e4 LT |
811 | */ |
812 | if (len > INT_MAX - sizeof(struct udphdr)) | |
813 | return -EMSGSIZE; | |
1ab1457c | 814 | |
1da177e4 LT |
815 | if (up->pending) { |
816 | /* | |
817 | * There are pending frames. | |
818 | * The socket lock must be held while it's corked. | |
819 | */ | |
820 | lock_sock(sk); | |
821 | if (likely(up->pending)) { | |
822 | if (unlikely(up->pending != AF_INET6)) { | |
823 | release_sock(sk); | |
824 | return -EAFNOSUPPORT; | |
825 | } | |
826 | dst = NULL; | |
827 | goto do_append_data; | |
828 | } | |
829 | release_sock(sk); | |
830 | } | |
831 | ulen += sizeof(struct udphdr); | |
832 | ||
132a55f3 | 833 | memset(&fl, 0, sizeof(fl)); |
1da177e4 LT |
834 | |
835 | if (sin6) { | |
836 | if (sin6->sin6_port == 0) | |
837 | return -EINVAL; | |
838 | ||
132a55f3 | 839 | fl.fl_ip_dport = sin6->sin6_port; |
1da177e4 LT |
840 | daddr = &sin6->sin6_addr; |
841 | ||
842 | if (np->sndflow) { | |
132a55f3 HX |
843 | fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
844 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
845 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
846 | if (flowlabel == NULL) |
847 | return -EINVAL; | |
848 | daddr = &flowlabel->dst; | |
849 | } | |
850 | } | |
851 | ||
852 | /* | |
853 | * Otherwise it will be difficult to maintain | |
854 | * sk->sk_dst_cache. | |
855 | */ | |
856 | if (sk->sk_state == TCP_ESTABLISHED && | |
857 | ipv6_addr_equal(daddr, &np->daddr)) | |
858 | daddr = &np->daddr; | |
859 | ||
860 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
861 | sin6->sin6_scope_id && | |
862 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) | |
132a55f3 | 863 | fl.oif = sin6->sin6_scope_id; |
1da177e4 LT |
864 | } else { |
865 | if (sk->sk_state != TCP_ESTABLISHED) | |
866 | return -EDESTADDRREQ; | |
867 | ||
c720c7e8 | 868 | fl.fl_ip_dport = inet->inet_dport; |
1da177e4 | 869 | daddr = &np->daddr; |
132a55f3 | 870 | fl.fl6_flowlabel = np->flow_label; |
987905de | 871 | connected = 1; |
1da177e4 LT |
872 | } |
873 | ||
132a55f3 HX |
874 | if (!fl.oif) |
875 | fl.oif = sk->sk_bound_dev_if; | |
1da177e4 | 876 | |
9f690db7 YH |
877 | if (!fl.oif) |
878 | fl.oif = np->sticky_pktinfo.ipi6_ifindex; | |
879 | ||
51953d5b BH |
880 | fl.mark = sk->sk_mark; |
881 | ||
1da177e4 LT |
882 | if (msg->msg_controllen) { |
883 | opt = &opt_space; | |
884 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
885 | opt->tot_len = sizeof(*opt); | |
886 | ||
91e1908f | 887 | err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); |
1da177e4 LT |
888 | if (err < 0) { |
889 | fl6_sock_release(flowlabel); | |
890 | return err; | |
891 | } | |
132a55f3 HX |
892 | if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
893 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
894 | if (flowlabel == NULL) |
895 | return -EINVAL; | |
896 | } | |
897 | if (!(opt->opt_nflen|opt->opt_flen)) | |
898 | opt = NULL; | |
987905de | 899 | connected = 0; |
1da177e4 LT |
900 | } |
901 | if (opt == NULL) | |
902 | opt = np->opt; | |
df9890c3 YH |
903 | if (flowlabel) |
904 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
905 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 906 | |
ba4e58ec | 907 | fl.proto = sk->sk_protocol; |
876c7f41 BH |
908 | if (!ipv6_addr_any(daddr)) |
909 | ipv6_addr_copy(&fl.fl6_dst, daddr); | |
910 | else | |
911 | fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
132a55f3 HX |
912 | if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
913 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
c720c7e8 | 914 | fl.fl_ip_sport = inet->inet_sport; |
1ab1457c | 915 | |
1da177e4 LT |
916 | /* merge ip6_build_xmit from ip6_output */ |
917 | if (opt && opt->srcrt) { | |
918 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
132a55f3 HX |
919 | ipv6_addr_copy(&final, &fl.fl6_dst); |
920 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1da177e4 | 921 | final_p = &final; |
987905de | 922 | connected = 0; |
1da177e4 LT |
923 | } |
924 | ||
132a55f3 HX |
925 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { |
926 | fl.oif = np->mcast_oif; | |
987905de MK |
927 | connected = 0; |
928 | } | |
1da177e4 | 929 | |
132a55f3 | 930 | security_sk_classify_flow(sk, &fl); |
beb8d13b | 931 | |
132a55f3 | 932 | err = ip6_sk_dst_lookup(sk, &dst, &fl); |
1da177e4 LT |
933 | if (err) |
934 | goto out; | |
935 | if (final_p) | |
132a55f3 | 936 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
1da177e4 | 937 | |
52479b62 AD |
938 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
939 | if (err < 0) { | |
14e50e57 DM |
940 | if (err == -EREMOTE) |
941 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
942 | if (err < 0) | |
943 | goto out; | |
944 | } | |
1da177e4 LT |
945 | |
946 | if (hlimit < 0) { | |
132a55f3 | 947 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
1da177e4 LT |
948 | hlimit = np->mcast_hops; |
949 | else | |
950 | hlimit = np->hop_limit; | |
951 | if (hlimit < 0) | |
6b75d090 | 952 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 LT |
953 | } |
954 | ||
e651f03a | 955 | if (tclass < 0) |
41a1f8ea | 956 | tclass = np->tclass; |
41a1f8ea | 957 | |
1da177e4 LT |
958 | if (msg->msg_flags&MSG_CONFIRM) |
959 | goto do_confirm; | |
960 | back_from_confirm: | |
961 | ||
962 | lock_sock(sk); | |
963 | if (unlikely(up->pending)) { | |
964 | /* The socket is already corked while preparing it. */ | |
965 | /* ... which is an evident application bug. --ANK */ | |
966 | release_sock(sk); | |
967 | ||
64ce2073 | 968 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
969 | err = -EINVAL; |
970 | goto out; | |
971 | } | |
972 | ||
973 | up->pending = AF_INET6; | |
974 | ||
975 | do_append_data: | |
976 | up->len += ulen; | |
ba4e58ec GR |
977 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
978 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
132a55f3 | 979 | sizeof(struct udphdr), hlimit, tclass, opt, &fl, |
41a1f8ea YH |
980 | (struct rt6_info*)dst, |
981 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
1da177e4 LT |
982 | if (err) |
983 | udp_v6_flush_pending_frames(sk); | |
984 | else if (!corkreq) | |
4c0a6cb0 | 985 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
986 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
987 | up->pending = 0; | |
1da177e4 | 988 | |
a5e7c210 DM |
989 | if (dst) { |
990 | if (connected) { | |
991 | ip6_dst_store(sk, dst, | |
132a55f3 | 992 | ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
8e1ef0a9 YH |
993 | &np->daddr : NULL, |
994 | #ifdef CONFIG_IPV6_SUBTREES | |
132a55f3 | 995 | ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
8e1ef0a9 YH |
996 | &np->saddr : |
997 | #endif | |
998 | NULL); | |
a5e7c210 DM |
999 | } else { |
1000 | dst_release(dst); | |
1001 | } | |
a3c96089 | 1002 | dst = NULL; |
a5e7c210 DM |
1003 | } |
1004 | ||
1da177e4 LT |
1005 | if (err > 0) |
1006 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1007 | release_sock(sk); | |
1008 | out: | |
a3c96089 | 1009 | dst_release(dst); |
1da177e4 | 1010 | fl6_sock_release(flowlabel); |
cd562c98 | 1011 | if (!err) |
1da177e4 | 1012 | return len; |
a18135eb DM |
1013 | /* |
1014 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1015 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1016 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1017 | * things). We could add another new stat but at least for now that | |
1018 | * seems like overkill. | |
1019 | */ | |
1020 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1021 | UDP6_INC_STATS_USER(sock_net(sk), |
1022 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1023 | } |
1da177e4 LT |
1024 | return err; |
1025 | ||
1026 | do_confirm: | |
1027 | dst_confirm(dst); | |
1028 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1029 | goto back_from_confirm; | |
1030 | err = 0; | |
1031 | goto out; | |
1032 | } | |
1033 | ||
7d06b2e0 | 1034 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 LT |
1035 | { |
1036 | lock_sock(sk); | |
1037 | udp_v6_flush_pending_frames(sk); | |
1038 | release_sock(sk); | |
1039 | ||
1040 | inet6_destroy_sock(sk); | |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | /* | |
1044 | * Socket option code for UDP | |
1045 | */ | |
ba4e58ec | 1046 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1047 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1048 | { |
db8dac20 | 1049 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1050 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1051 | udp_v6_push_pending_frames); | |
ba4e58ec | 1052 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1053 | } |
1054 | ||
1055 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1056 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1057 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1058 | { |
db8dac20 | 1059 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1060 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1061 | udp_v6_push_pending_frames); | |
ba4e58ec | 1062 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1063 | } |
1064 | #endif | |
1065 | ||
ba4e58ec GR |
1066 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1067 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1068 | { |
db8dac20 | 1069 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1070 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1071 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1072 | } |
1073 | ||
1074 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1075 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1076 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1077 | { |
db8dac20 | 1078 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1079 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1080 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1081 | } |
1082 | #endif | |
1083 | ||
ba735425 SS |
1084 | static int udp6_ufo_send_check(struct sk_buff *skb) |
1085 | { | |
1086 | struct ipv6hdr *ipv6h; | |
1087 | struct udphdr *uh; | |
1088 | ||
1089 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | ipv6h = ipv6_hdr(skb); | |
1093 | uh = udp_hdr(skb); | |
1094 | ||
1095 | uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
1096 | IPPROTO_UDP, 0); | |
1097 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1098 | skb->csum_offset = offsetof(struct udphdr, check); | |
1099 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) | |
1104 | { | |
1105 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1106 | unsigned int mss; | |
1107 | unsigned int unfrag_ip6hlen, unfrag_len; | |
1108 | struct frag_hdr *fptr; | |
1109 | u8 *mac_start, *prevhdr; | |
1110 | u8 nexthdr; | |
1111 | u8 frag_hdr_sz = sizeof(struct frag_hdr); | |
1112 | int offset; | |
1113 | __wsum csum; | |
1114 | ||
1115 | mss = skb_shinfo(skb)->gso_size; | |
1116 | if (unlikely(skb->len <= mss)) | |
1117 | goto out; | |
1118 | ||
1119 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
1120 | /* Packet is from an untrusted source, reset gso_segs. */ | |
1121 | int type = skb_shinfo(skb)->gso_type; | |
1122 | ||
1123 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
1124 | !(type & (SKB_GSO_UDP)))) | |
1125 | goto out; | |
1126 | ||
1127 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
1128 | ||
1129 | segs = NULL; | |
1130 | goto out; | |
1131 | } | |
1132 | ||
1133 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
1134 | * do checksum of UDP packets sent as multiple IP fragments. | |
1135 | */ | |
1136 | offset = skb->csum_start - skb_headroom(skb); | |
1137 | csum = skb_checksum(skb, offset, skb->len- offset, 0); | |
1138 | offset += skb->csum_offset; | |
1139 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
1140 | skb->ip_summed = CHECKSUM_NONE; | |
1141 | ||
1142 | /* Check if there is enough headroom to insert fragment header. */ | |
1143 | if ((skb_headroom(skb) < frag_hdr_sz) && | |
1144 | pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) | |
1145 | goto out; | |
1146 | ||
1147 | /* Find the unfragmentable header and shift it left by frag_hdr_sz | |
1148 | * bytes to insert fragment header. | |
1149 | */ | |
1150 | unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
1151 | nexthdr = *prevhdr; | |
1152 | *prevhdr = NEXTHDR_FRAGMENT; | |
1153 | unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + | |
1154 | unfrag_ip6hlen; | |
1155 | mac_start = skb_mac_header(skb); | |
1156 | memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); | |
1157 | ||
1158 | skb->mac_header -= frag_hdr_sz; | |
1159 | skb->network_header -= frag_hdr_sz; | |
1160 | ||
1161 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); | |
1162 | fptr->nexthdr = nexthdr; | |
1163 | fptr->reserved = 0; | |
1164 | ipv6_select_ident(fptr); | |
1165 | ||
1166 | /* Fragment the skb. ipv6 header and the remaining fields of the | |
1167 | * fragment header are updated in ipv6_gso_segment() | |
1168 | */ | |
1169 | segs = skb_segment(skb, features); | |
1170 | ||
1171 | out: | |
1172 | return segs; | |
1173 | } | |
1174 | ||
41135cc8 | 1175 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1176 | .handler = udpv6_rcv, |
1177 | .err_handler = udpv6_err, | |
ba735425 SS |
1178 | .gso_send_check = udp6_ufo_send_check, |
1179 | .gso_segment = udp6_ufo_fragment, | |
1da177e4 LT |
1180 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1181 | }; | |
1182 | ||
1183 | /* ------------------------------------------------------------------------ */ | |
1184 | #ifdef CONFIG_PROC_FS | |
1185 | ||
1186 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) | |
1187 | { | |
1188 | struct inet_sock *inet = inet_sk(sp); | |
1189 | struct ipv6_pinfo *np = inet6_sk(sp); | |
1190 | struct in6_addr *dest, *src; | |
1191 | __u16 destp, srcp; | |
1192 | ||
1193 | dest = &np->daddr; | |
1194 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1195 | destp = ntohs(inet->inet_dport); |
1196 | srcp = ntohs(inet->inet_sport); | |
1da177e4 | 1197 | seq_printf(seq, |
f86dcc5a | 1198 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
cb61cb9b | 1199 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
1da177e4 LT |
1200 | bucket, |
1201 | src->s6_addr32[0], src->s6_addr32[1], | |
1202 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1203 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1204 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1205 | sp->sk_state, |
31e6d363 ED |
1206 | sk_wmem_alloc_get(sp), |
1207 | sk_rmem_alloc_get(sp), | |
1da177e4 LT |
1208 | 0, 0L, 0, |
1209 | sock_i_uid(sp), 0, | |
1210 | sock_i_ino(sp), | |
cb61cb9b ED |
1211 | atomic_read(&sp->sk_refcnt), sp, |
1212 | atomic_read(&sp->sk_drops)); | |
1da177e4 LT |
1213 | } |
1214 | ||
ba4e58ec | 1215 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1216 | { |
1217 | if (v == SEQ_START_TOKEN) | |
1218 | seq_printf(seq, | |
1219 | " sl " | |
1220 | "local_address " | |
1221 | "remote_address " | |
1222 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
cb61cb9b | 1223 | " uid timeout inode ref pointer drops\n"); |
1da177e4 LT |
1224 | else |
1225 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1da177e4 | 1229 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1230 | .name = "udp6", |
1231 | .family = AF_INET6, | |
645ca708 | 1232 | .udp_table = &udp_table, |
4ad96d39 DL |
1233 | .seq_fops = { |
1234 | .owner = THIS_MODULE, | |
1235 | }, | |
dda61925 DL |
1236 | .seq_ops = { |
1237 | .show = udp6_seq_show, | |
1238 | }, | |
1da177e4 LT |
1239 | }; |
1240 | ||
0c96d8c5 | 1241 | int udp6_proc_init(struct net *net) |
1da177e4 | 1242 | { |
0c96d8c5 | 1243 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1244 | } |
1245 | ||
0c96d8c5 DL |
1246 | void udp6_proc_exit(struct net *net) { |
1247 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1248 | } |
1249 | #endif /* CONFIG_PROC_FS */ | |
1250 | ||
1251 | /* ------------------------------------------------------------------------ */ | |
1252 | ||
1253 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1254 | .name = "UDPv6", |
1255 | .owner = THIS_MODULE, | |
ba4e58ec | 1256 | .close = udp_lib_close, |
543d9cfe ACM |
1257 | .connect = ip6_datagram_connect, |
1258 | .disconnect = udp_disconnect, | |
1259 | .ioctl = udp_ioctl, | |
1260 | .destroy = udpv6_destroy_sock, | |
1261 | .setsockopt = udpv6_setsockopt, | |
1262 | .getsockopt = udpv6_getsockopt, | |
1263 | .sendmsg = udpv6_sendmsg, | |
1264 | .recvmsg = udpv6_recvmsg, | |
1265 | .backlog_rcv = udpv6_queue_rcv_skb, | |
ba4e58ec GR |
1266 | .hash = udp_lib_hash, |
1267 | .unhash = udp_lib_unhash, | |
543d9cfe | 1268 | .get_port = udp_v6_get_port, |
95766fff HA |
1269 | .memory_allocated = &udp_memory_allocated, |
1270 | .sysctl_mem = sysctl_udp_mem, | |
1271 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1272 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1273 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1274 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1275 | .h.udp_table = &udp_table, |
3fdadf7d | 1276 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1277 | .compat_setsockopt = compat_udpv6_setsockopt, |
1278 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1279 | #endif |
1da177e4 LT |
1280 | }; |
1281 | ||
1da177e4 LT |
1282 | static struct inet_protosw udpv6_protosw = { |
1283 | .type = SOCK_DGRAM, | |
1284 | .protocol = IPPROTO_UDP, | |
1285 | .prot = &udpv6_prot, | |
1286 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1287 | .no_check = UDP_CSUM_DEFAULT, |
1288 | .flags = INET_PROTOSW_PERMANENT, | |
1289 | }; | |
1290 | ||
1291 | ||
7f4e4868 | 1292 | int __init udpv6_init(void) |
1da177e4 | 1293 | { |
7f4e4868 DL |
1294 | int ret; |
1295 | ||
1296 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1297 | if (ret) | |
1298 | goto out; | |
1299 | ||
1300 | ret = inet6_register_protosw(&udpv6_protosw); | |
1301 | if (ret) | |
1302 | goto out_udpv6_protocol; | |
1303 | out: | |
1304 | return ret; | |
1305 | ||
1306 | out_udpv6_protocol: | |
1307 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1308 | goto out; | |
1309 | } | |
1310 | ||
09f7709f | 1311 | void udpv6_exit(void) |
7f4e4868 DL |
1312 | { |
1313 | inet6_unregister_protosw(&udpv6_protosw); | |
1314 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1315 | } |