Commit | Line | Data |
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3df80d93 ACM |
1 | /* |
2 | * DCCP over IPv6 | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Based on net/dccp6/ipv6.c | |
6 | * | |
7 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/xfrm.h> | |
19 | ||
20 | #include <net/addrconf.h> | |
21 | #include <net/inet_common.h> | |
22 | #include <net/inet_hashtables.h> | |
23 | #include <net/inet6_connection_sock.h> | |
24 | #include <net/inet6_hashtables.h> | |
25 | #include <net/ip6_route.h> | |
26 | #include <net/ipv6.h> | |
27 | #include <net/protocol.h> | |
28 | #include <net/transp_v6.h> | |
29 | #include <net/xfrm.h> | |
30 | ||
31 | #include "dccp.h" | |
32 | #include "ipv6.h" | |
33 | ||
34 | static void dccp_v6_ctl_send_reset(struct sk_buff *skb); | |
35 | static void dccp_v6_reqsk_send_ack(struct sk_buff *skb, | |
36 | struct request_sock *req); | |
37 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
38 | ||
39 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
40 | ||
41 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; | |
42 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
43 | ||
44 | static int dccp_v6_get_port(struct sock *sk, unsigned short snum) | |
45 | { | |
46 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, | |
47 | inet6_csk_bind_conflict); | |
48 | } | |
49 | ||
50 | static void dccp_v6_hash(struct sock *sk) | |
51 | { | |
52 | if (sk->sk_state != DCCP_CLOSED) { | |
53 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
54 | dccp_prot.hash(sk); | |
55 | return; | |
56 | } | |
57 | local_bh_disable(); | |
58 | __inet6_hash(&dccp_hashinfo, sk); | |
59 | local_bh_enable(); | |
60 | } | |
61 | } | |
62 | ||
63 | static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len, | |
64 | struct in6_addr *saddr, | |
65 | struct in6_addr *daddr, | |
66 | unsigned long base) | |
67 | { | |
68 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base); | |
69 | } | |
70 | ||
71 | static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
72 | { | |
73 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
74 | ||
75 | if (skb->protocol == htons(ETH_P_IPV6)) | |
76 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
77 | skb->nh.ipv6h->saddr.s6_addr32, | |
78 | dh->dccph_dport, | |
79 | dh->dccph_sport); | |
80 | else | |
81 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
82 | skb->nh.iph->saddr, | |
83 | dh->dccph_dport, | |
84 | dh->dccph_sport); | |
85 | } | |
86 | ||
87 | static int __dccp_v6_check_established(struct sock *sk, const __u16 lport, | |
88 | struct inet_timewait_sock **twp) | |
89 | { | |
90 | struct inet_sock *inet = inet_sk(sk); | |
91 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
92 | const struct in6_addr *daddr = &np->rcv_saddr; | |
93 | const struct in6_addr *saddr = &np->daddr; | |
94 | const int dif = sk->sk_bound_dev_if; | |
95 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); | |
96 | const unsigned int hash = inet6_ehashfn(daddr, inet->num, | |
97 | saddr, inet->dport); | |
98 | struct inet_ehash_bucket *head = inet_ehash_bucket(&dccp_hashinfo, hash); | |
99 | struct sock *sk2; | |
100 | const struct hlist_node *node; | |
101 | struct inet_timewait_sock *tw; | |
102 | ||
103 | prefetch(head->chain.first); | |
104 | write_lock(&head->lock); | |
105 | ||
106 | /* Check TIME-WAIT sockets first. */ | |
107 | sk_for_each(sk2, node, &(head + dccp_hashinfo.ehash_size)->chain) { | |
108 | const struct inet6_timewait_sock *tw6 = inet6_twsk(sk2); | |
109 | ||
110 | tw = inet_twsk(sk2); | |
111 | ||
112 | if(*((__u32 *)&(tw->tw_dport)) == ports && | |
113 | sk2->sk_family == PF_INET6 && | |
114 | ipv6_addr_equal(&tw6->tw_v6_daddr, saddr) && | |
115 | ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr) && | |
116 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) | |
117 | goto not_unique; | |
118 | } | |
119 | tw = NULL; | |
120 | ||
121 | /* And established part... */ | |
122 | sk_for_each(sk2, node, &head->chain) { | |
123 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) | |
124 | goto not_unique; | |
125 | } | |
126 | ||
127 | BUG_TRAP(sk_unhashed(sk)); | |
128 | __sk_add_node(sk, &head->chain); | |
129 | sk->sk_hash = hash; | |
130 | sock_prot_inc_use(sk->sk_prot); | |
131 | write_unlock(&head->lock); | |
132 | ||
133 | if (twp) { | |
134 | *twp = tw; | |
135 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
136 | } else if (tw) { | |
137 | /* Silly. Should hash-dance instead... */ | |
138 | inet_twsk_deschedule(tw, &dccp_death_row); | |
139 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
140 | ||
141 | inet_twsk_put(tw); | |
142 | } | |
143 | return 0; | |
144 | ||
145 | not_unique: | |
146 | write_unlock(&head->lock); | |
147 | return -EADDRNOTAVAIL; | |
148 | } | |
149 | ||
150 | static inline u32 dccp_v6_port_offset(const struct sock *sk) | |
151 | { | |
152 | const struct inet_sock *inet = inet_sk(sk); | |
153 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
154 | ||
155 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
156 | np->daddr.s6_addr32, | |
157 | inet->dport); | |
158 | } | |
159 | ||
160 | static int dccp_v6_hash_connect(struct sock *sk) | |
161 | { | |
162 | const unsigned short snum = inet_sk(sk)->num; | |
163 | struct inet_bind_hashbucket *head; | |
164 | struct inet_bind_bucket *tb; | |
165 | int ret; | |
166 | ||
167 | if (snum == 0) { | |
168 | int low = sysctl_local_port_range[0]; | |
169 | int high = sysctl_local_port_range[1]; | |
170 | int range = high - low; | |
171 | int i; | |
172 | int port; | |
173 | static u32 hint; | |
174 | u32 offset = hint + dccp_v6_port_offset(sk); | |
175 | struct hlist_node *node; | |
176 | struct inet_timewait_sock *tw = NULL; | |
177 | ||
178 | local_bh_disable(); | |
179 | for (i = 1; i <= range; i++) { | |
180 | port = low + (i + offset) % range; | |
181 | head = &dccp_hashinfo.bhash[inet_bhashfn(port, | |
182 | dccp_hashinfo.bhash_size)]; | |
183 | spin_lock(&head->lock); | |
184 | ||
185 | /* Does not bother with rcv_saddr checks, | |
186 | * because the established check is already | |
187 | * unique enough. | |
188 | */ | |
189 | inet_bind_bucket_for_each(tb, node, &head->chain) { | |
190 | if (tb->port == port) { | |
191 | BUG_TRAP(!hlist_empty(&tb->owners)); | |
192 | if (tb->fastreuse >= 0) | |
193 | goto next_port; | |
194 | if (!__dccp_v6_check_established(sk, | |
195 | port, | |
196 | &tw)) | |
197 | goto ok; | |
198 | goto next_port; | |
199 | } | |
200 | } | |
201 | ||
202 | tb = inet_bind_bucket_create(dccp_hashinfo.bind_bucket_cachep, | |
203 | head, port); | |
204 | if (!tb) { | |
205 | spin_unlock(&head->lock); | |
206 | break; | |
207 | } | |
208 | tb->fastreuse = -1; | |
209 | goto ok; | |
210 | ||
211 | next_port: | |
212 | spin_unlock(&head->lock); | |
213 | } | |
214 | local_bh_enable(); | |
215 | ||
216 | return -EADDRNOTAVAIL; | |
217 | ok: | |
218 | hint += i; | |
219 | ||
220 | /* Head lock still held and bh's disabled */ | |
221 | inet_bind_hash(sk, tb, port); | |
222 | if (sk_unhashed(sk)) { | |
223 | inet_sk(sk)->sport = htons(port); | |
224 | __inet6_hash(&dccp_hashinfo, sk); | |
225 | } | |
226 | spin_unlock(&head->lock); | |
227 | ||
228 | if (tw) { | |
229 | inet_twsk_deschedule(tw, &dccp_death_row); | |
230 | inet_twsk_put(tw); | |
231 | } | |
232 | ||
233 | ret = 0; | |
234 | goto out; | |
235 | } | |
236 | ||
237 | head = &dccp_hashinfo.bhash[inet_bhashfn(snum, | |
238 | dccp_hashinfo.bhash_size)]; | |
239 | tb = inet_csk(sk)->icsk_bind_hash; | |
240 | spin_lock_bh(&head->lock); | |
241 | ||
242 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
243 | __inet6_hash(&dccp_hashinfo, sk); | |
244 | spin_unlock_bh(&head->lock); | |
245 | return 0; | |
246 | } else { | |
247 | spin_unlock(&head->lock); | |
248 | /* No definite answer... Walk to established hash table */ | |
249 | ret = __dccp_v6_check_established(sk, snum, NULL); | |
250 | out: | |
251 | local_bh_enable(); | |
252 | return ret; | |
253 | } | |
254 | } | |
255 | ||
256 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, | |
257 | int addr_len) | |
258 | { | |
259 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
260 | struct inet_sock *inet = inet_sk(sk); | |
261 | struct ipv6_pinfo *np = inet6_sk(sk); | |
262 | struct dccp_sock *dp = dccp_sk(sk); | |
263 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
264 | struct flowi fl; | |
265 | struct dst_entry *dst; | |
266 | int addr_type; | |
267 | int err; | |
268 | ||
269 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
270 | ||
271 | if (addr_len < SIN6_LEN_RFC2133) | |
272 | return -EINVAL; | |
273 | ||
274 | if (usin->sin6_family != AF_INET6) | |
275 | return -EAFNOSUPPORT; | |
276 | ||
277 | memset(&fl, 0, sizeof(fl)); | |
278 | ||
279 | if (np->sndflow) { | |
280 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
281 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
282 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
283 | struct ip6_flowlabel *flowlabel; | |
284 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
285 | if (flowlabel == NULL) | |
286 | return -EINVAL; | |
287 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
288 | fl6_sock_release(flowlabel); | |
289 | } | |
290 | } | |
291 | ||
292 | /* | |
293 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
294 | */ | |
295 | ||
296 | if (ipv6_addr_any(&usin->sin6_addr)) | |
297 | usin->sin6_addr.s6_addr[15] = 0x1; | |
298 | ||
299 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
300 | ||
301 | if(addr_type & IPV6_ADDR_MULTICAST) | |
302 | return -ENETUNREACH; | |
303 | ||
304 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
305 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
306 | usin->sin6_scope_id) { | |
307 | /* If interface is set while binding, indices | |
308 | * must coincide. | |
309 | */ | |
310 | if (sk->sk_bound_dev_if && | |
311 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
312 | return -EINVAL; | |
313 | ||
314 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
315 | } | |
316 | ||
317 | /* Connect to link-local address requires an interface */ | |
318 | if (!sk->sk_bound_dev_if) | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
323 | np->flow_label = fl.fl6_flowlabel; | |
324 | ||
325 | /* | |
326 | * DCCP over IPv4 | |
327 | */ | |
328 | ||
329 | if (addr_type == IPV6_ADDR_MAPPED) { | |
330 | u32 exthdrlen = dp->dccps_ext_header_len; | |
331 | struct sockaddr_in sin; | |
332 | ||
333 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
334 | ||
335 | if (__ipv6_only_sock(sk)) | |
336 | return -ENETUNREACH; | |
337 | ||
338 | sin.sin_family = AF_INET; | |
339 | sin.sin_port = usin->sin6_port; | |
340 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
341 | ||
342 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_mapped; | |
343 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
344 | ||
345 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
346 | ||
347 | if (err) { | |
348 | dp->dccps_ext_header_len = exthdrlen; | |
349 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; | |
350 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
351 | goto failure; | |
352 | } else { | |
353 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
354 | inet->saddr); | |
355 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
356 | inet->rcv_saddr); | |
357 | } | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
363 | saddr = &np->rcv_saddr; | |
364 | ||
365 | fl.proto = IPPROTO_DCCP; | |
366 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
367 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
368 | fl.oif = sk->sk_bound_dev_if; | |
369 | fl.fl_ip_dport = usin->sin6_port; | |
370 | fl.fl_ip_sport = inet->sport; | |
371 | ||
372 | if (np->opt && np->opt->srcrt) { | |
373 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
374 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
375 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
376 | final_p = &final; | |
377 | } | |
378 | ||
379 | err = ip6_dst_lookup(sk, &dst, &fl); | |
380 | if (err) | |
381 | goto failure; | |
382 | if (final_p) | |
383 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
384 | ||
385 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
386 | goto failure; | |
387 | ||
388 | if (saddr == NULL) { | |
389 | saddr = &fl.fl6_src; | |
390 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
391 | } | |
392 | ||
393 | /* set the source address */ | |
394 | ipv6_addr_copy(&np->saddr, saddr); | |
395 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
396 | ||
397 | ip6_dst_store(sk, dst, NULL); | |
398 | ||
399 | dp->dccps_ext_header_len = 0; | |
400 | if (np->opt) | |
401 | dp->dccps_ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; | |
402 | ||
403 | inet->dport = usin->sin6_port; | |
404 | ||
405 | dccp_set_state(sk, DCCP_REQUESTING); | |
406 | err = dccp_v6_hash_connect(sk); | |
407 | if (err) | |
408 | goto late_failure; | |
409 | /* FIXME */ | |
410 | #if 0 | |
411 | dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32, | |
412 | np->daddr.s6_addr32, | |
413 | inet->sport, | |
414 | inet->dport); | |
415 | #endif | |
416 | err = dccp_connect(sk); | |
417 | if (err) | |
418 | goto late_failure; | |
419 | ||
420 | return 0; | |
421 | ||
422 | late_failure: | |
423 | dccp_set_state(sk, DCCP_CLOSED); | |
424 | __sk_dst_reset(sk); | |
425 | failure: | |
426 | inet->dport = 0; | |
427 | sk->sk_route_caps = 0; | |
428 | return err; | |
429 | } | |
430 | ||
431 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
432 | int type, int code, int offset, __u32 info) | |
433 | { | |
434 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; | |
435 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
436 | struct ipv6_pinfo *np; | |
437 | struct sock *sk; | |
438 | int err; | |
439 | __u64 seq; | |
440 | ||
441 | sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, | |
442 | &hdr->saddr, dh->dccph_sport, skb->dev->ifindex); | |
443 | ||
444 | if (sk == NULL) { | |
445 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
446 | return; | |
447 | } | |
448 | ||
449 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
450 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
451 | return; | |
452 | } | |
453 | ||
454 | bh_lock_sock(sk); | |
455 | if (sock_owned_by_user(sk)) | |
456 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
457 | ||
458 | if (sk->sk_state == DCCP_CLOSED) | |
459 | goto out; | |
460 | ||
461 | np = inet6_sk(sk); | |
462 | ||
463 | if (type == ICMPV6_PKT_TOOBIG) { | |
464 | struct dccp_sock *dp = dccp_sk(sk); | |
465 | struct dst_entry *dst = NULL; | |
466 | ||
467 | if (sock_owned_by_user(sk)) | |
468 | goto out; | |
469 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
470 | goto out; | |
471 | ||
472 | /* icmp should have updated the destination cache entry */ | |
473 | dst = __sk_dst_check(sk, np->dst_cookie); | |
474 | ||
475 | if (dst == NULL) { | |
476 | struct inet_sock *inet = inet_sk(sk); | |
477 | struct flowi fl; | |
478 | ||
479 | /* BUGGG_FUTURE: Again, it is not clear how | |
480 | to handle rthdr case. Ignore this complexity | |
481 | for now. | |
482 | */ | |
483 | memset(&fl, 0, sizeof(fl)); | |
484 | fl.proto = IPPROTO_DCCP; | |
485 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
486 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
487 | fl.oif = sk->sk_bound_dev_if; | |
488 | fl.fl_ip_dport = inet->dport; | |
489 | fl.fl_ip_sport = inet->sport; | |
490 | ||
491 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
492 | sk->sk_err_soft = -err; | |
493 | goto out; | |
494 | } | |
495 | ||
496 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
497 | sk->sk_err_soft = -err; | |
498 | goto out; | |
499 | } | |
500 | ||
501 | } else | |
502 | dst_hold(dst); | |
503 | ||
504 | if (dp->dccps_pmtu_cookie > dst_mtu(dst)) { | |
505 | dccp_sync_mss(sk, dst_mtu(dst)); | |
506 | } /* else let the usual retransmit timer handle it */ | |
507 | dst_release(dst); | |
508 | goto out; | |
509 | } | |
510 | ||
511 | icmpv6_err_convert(type, code, &err); | |
512 | ||
513 | seq = DCCP_SKB_CB(skb)->dccpd_seq; | |
514 | /* Might be for an request_sock */ | |
515 | switch (sk->sk_state) { | |
516 | struct request_sock *req, **prev; | |
517 | case DCCP_LISTEN: | |
518 | if (sock_owned_by_user(sk)) | |
519 | goto out; | |
520 | ||
521 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
522 | &hdr->daddr, &hdr->saddr, | |
523 | inet6_iif(skb)); | |
524 | if (!req) | |
525 | goto out; | |
526 | ||
527 | /* ICMPs are not backlogged, hence we cannot get | |
528 | * an established socket here. | |
529 | */ | |
530 | BUG_TRAP(req->sk == NULL); | |
531 | ||
532 | if (seq != dccp_rsk(req)->dreq_iss) { | |
533 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
534 | goto out; | |
535 | } | |
536 | ||
537 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
538 | goto out; | |
539 | ||
540 | case DCCP_REQUESTING: | |
541 | case DCCP_RESPOND: /* Cannot happen. | |
542 | It can, it SYNs are crossed. --ANK */ | |
543 | if (!sock_owned_by_user(sk)) { | |
544 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
545 | sk->sk_err = err; | |
546 | /* | |
547 | * Wake people up to see the error | |
548 | * (see connect in sock.c) | |
549 | */ | |
550 | sk->sk_error_report(sk); | |
551 | ||
552 | dccp_done(sk); | |
553 | } else | |
554 | sk->sk_err_soft = err; | |
555 | goto out; | |
556 | } | |
557 | ||
558 | if (!sock_owned_by_user(sk) && np->recverr) { | |
559 | sk->sk_err = err; | |
560 | sk->sk_error_report(sk); | |
561 | } else | |
562 | sk->sk_err_soft = err; | |
563 | ||
564 | out: | |
565 | bh_unlock_sock(sk); | |
566 | sock_put(sk); | |
567 | } | |
568 | ||
569 | ||
570 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, | |
571 | struct dst_entry *dst) | |
572 | { | |
573 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
574 | struct ipv6_pinfo *np = inet6_sk(sk); | |
575 | struct sk_buff *skb; | |
576 | struct ipv6_txoptions *opt = NULL; | |
577 | struct in6_addr *final_p = NULL, final; | |
578 | struct flowi fl; | |
579 | int err = -1; | |
580 | ||
581 | memset(&fl, 0, sizeof(fl)); | |
582 | fl.proto = IPPROTO_DCCP; | |
583 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
584 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
585 | fl.fl6_flowlabel = 0; | |
586 | fl.oif = ireq6->iif; | |
587 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
588 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
589 | ||
590 | if (dst == NULL) { | |
591 | opt = np->opt; | |
592 | if (opt == NULL && | |
593 | np->rxopt.bits.osrcrt == 2 && | |
594 | ireq6->pktopts) { | |
595 | struct sk_buff *pktopts = ireq6->pktopts; | |
596 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); | |
597 | if (rxopt->srcrt) | |
598 | opt = ipv6_invert_rthdr(sk, | |
599 | (struct ipv6_rt_hdr *)(pktopts->nh.raw + | |
600 | rxopt->srcrt)); | |
601 | } | |
602 | ||
603 | if (opt && opt->srcrt) { | |
604 | struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
605 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
606 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
607 | final_p = &final; | |
608 | } | |
609 | ||
610 | err = ip6_dst_lookup(sk, &dst, &fl); | |
611 | if (err) | |
612 | goto done; | |
613 | if (final_p) | |
614 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
615 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
616 | goto done; | |
617 | } | |
618 | ||
619 | skb = dccp_make_response(sk, dst, req); | |
620 | if (skb != NULL) { | |
621 | struct dccp_hdr *dh = dccp_hdr(skb); | |
622 | dh->dccph_checksum = dccp_v6_check(dh, skb->len, | |
623 | &ireq6->loc_addr, | |
624 | &ireq6->rmt_addr, | |
625 | csum_partial((char *)dh, | |
626 | skb->len, | |
627 | skb->csum)); | |
628 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
629 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
630 | if (err == NET_XMIT_CN) | |
631 | err = 0; | |
632 | } | |
633 | ||
634 | done: | |
635 | if (opt && opt != np->opt) | |
636 | sock_kfree_s(sk, opt, opt->tot_len); | |
637 | return err; | |
638 | } | |
639 | ||
640 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
641 | { | |
642 | if (inet6_rsk(req)->pktopts != NULL) | |
643 | kfree_skb(inet6_rsk(req)->pktopts); | |
644 | } | |
645 | ||
646 | static struct request_sock_ops dccp6_request_sock_ops = { | |
647 | .family = AF_INET6, | |
648 | .obj_size = sizeof(struct dccp6_request_sock), | |
649 | .rtx_syn_ack = dccp_v6_send_response, | |
650 | .send_ack = dccp_v6_reqsk_send_ack, | |
651 | .destructor = dccp_v6_reqsk_destructor, | |
652 | .send_reset = dccp_v6_ctl_send_reset, | |
653 | }; | |
654 | ||
655 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) | |
656 | { | |
657 | struct ipv6_pinfo *np = inet6_sk(sk); | |
658 | struct dccp_hdr *dh = dccp_hdr(skb); | |
659 | ||
660 | dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr, | |
661 | len, IPPROTO_DCCP, | |
662 | csum_partial((char *)dh, | |
663 | dh->dccph_doff << 2, | |
664 | skb->csum)); | |
665 | } | |
666 | ||
667 | static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb) | |
668 | { | |
669 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
670 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
671 | sizeof(struct dccp_hdr_ext) + | |
672 | sizeof(struct dccp_hdr_reset); | |
673 | struct sk_buff *skb; | |
674 | struct flowi fl; | |
675 | u64 seqno; | |
676 | ||
677 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
678 | return; | |
679 | ||
680 | if (!ipv6_unicast_destination(rxskb)) | |
681 | return; | |
682 | ||
683 | /* | |
684 | * We need to grab some memory, and put together an RST, | |
685 | * and then put it into the queue to be sent. | |
686 | */ | |
687 | ||
688 | skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + | |
689 | dccp_hdr_reset_len, GFP_ATOMIC); | |
690 | if (skb == NULL) | |
691 | return; | |
692 | ||
693 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) + | |
694 | dccp_hdr_reset_len); | |
695 | ||
696 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
697 | dh = dccp_hdr(skb); | |
698 | memset(dh, 0, dccp_hdr_reset_len); | |
699 | ||
700 | /* Swap the send and the receive. */ | |
701 | dh->dccph_type = DCCP_PKT_RESET; | |
702 | dh->dccph_sport = rxdh->dccph_dport; | |
703 | dh->dccph_dport = rxdh->dccph_sport; | |
704 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
705 | dh->dccph_x = 1; | |
706 | dccp_hdr_reset(skb)->dccph_reset_code = | |
707 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
708 | ||
709 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ | |
710 | seqno = 0; | |
711 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
712 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
713 | ||
714 | dccp_hdr_set_seq(dh, seqno); | |
715 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
716 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
717 | ||
718 | memset(&fl, 0, sizeof(fl)); | |
719 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
720 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
721 | dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
722 | sizeof(*dh), IPPROTO_DCCP, | |
723 | skb->csum); | |
724 | fl.proto = IPPROTO_DCCP; | |
725 | fl.oif = inet6_iif(rxskb); | |
726 | fl.fl_ip_dport = dh->dccph_dport; | |
727 | fl.fl_ip_sport = dh->dccph_sport; | |
728 | ||
729 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
730 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
731 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
732 | ip6_xmit(NULL, skb, &fl, NULL, 0); | |
733 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
734 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
735 | return; | |
736 | } | |
737 | } | |
738 | ||
739 | kfree_skb(skb); | |
740 | } | |
741 | ||
742 | static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb) | |
743 | { | |
744 | struct flowi fl; | |
745 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
746 | const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) + | |
747 | sizeof(struct dccp_hdr_ext) + | |
748 | sizeof(struct dccp_hdr_ack_bits); | |
749 | struct sk_buff *skb; | |
750 | ||
751 | skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + | |
752 | dccp_hdr_ack_len, GFP_ATOMIC); | |
753 | if (skb == NULL) | |
754 | return; | |
755 | ||
756 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) + | |
757 | dccp_hdr_ack_len); | |
758 | ||
759 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
760 | dh = dccp_hdr(skb); | |
761 | memset(dh, 0, dccp_hdr_ack_len); | |
762 | ||
763 | /* Build DCCP header and checksum it. */ | |
764 | dh->dccph_type = DCCP_PKT_ACK; | |
765 | dh->dccph_sport = rxdh->dccph_dport; | |
766 | dh->dccph_dport = rxdh->dccph_sport; | |
767 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
768 | dh->dccph_x = 1; | |
769 | ||
770 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); | |
771 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
772 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
773 | ||
774 | memset(&fl, 0, sizeof(fl)); | |
775 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
776 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
777 | ||
778 | /* FIXME: calculate checksum, IPv4 also should... */ | |
779 | ||
780 | fl.proto = IPPROTO_DCCP; | |
781 | fl.oif = inet6_iif(rxskb); | |
782 | fl.fl_ip_dport = dh->dccph_dport; | |
783 | fl.fl_ip_sport = dh->dccph_sport; | |
784 | ||
785 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
786 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
787 | ip6_xmit(NULL, skb, &fl, NULL, 0); | |
788 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
789 | return; | |
790 | } | |
791 | } | |
792 | ||
793 | kfree_skb(skb); | |
794 | } | |
795 | ||
796 | static void dccp_v6_reqsk_send_ack(struct sk_buff *skb, | |
797 | struct request_sock *req) | |
798 | { | |
799 | dccp_v6_ctl_send_ack(skb); | |
800 | } | |
801 | ||
802 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
803 | { | |
804 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
805 | const struct ipv6hdr *iph = skb->nh.ipv6h; | |
806 | struct sock *nsk; | |
807 | struct request_sock **prev; | |
808 | /* Find possible connection requests. */ | |
809 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
810 | dh->dccph_sport, | |
811 | &iph->saddr, | |
812 | &iph->daddr, | |
813 | inet6_iif(skb)); | |
814 | if (req != NULL) | |
815 | return dccp_check_req(sk, skb, req, prev); | |
816 | ||
817 | nsk = __inet6_lookup_established(&dccp_hashinfo, | |
818 | &iph->saddr, dh->dccph_sport, | |
819 | &iph->daddr, ntohs(dh->dccph_dport), | |
820 | inet6_iif(skb)); | |
821 | ||
822 | if (nsk != NULL) { | |
823 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
824 | bh_lock_sock(nsk); | |
825 | return nsk; | |
826 | } | |
827 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
828 | return NULL; | |
829 | } | |
830 | ||
831 | return sk; | |
832 | } | |
833 | ||
834 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
835 | { | |
836 | struct inet_request_sock *ireq; | |
837 | struct dccp_sock dp; | |
838 | struct request_sock *req; | |
839 | struct dccp_request_sock *dreq; | |
840 | struct inet6_request_sock *ireq6; | |
841 | struct ipv6_pinfo *np = inet6_sk(sk); | |
842 | const __u32 service = dccp_hdr_request(skb)->dccph_req_service; | |
843 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); | |
844 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
845 | ||
846 | if (skb->protocol == htons(ETH_P_IP)) | |
847 | return dccp_v4_conn_request(sk, skb); | |
848 | ||
849 | if (!ipv6_unicast_destination(skb)) | |
850 | goto drop; | |
851 | ||
852 | if (dccp_bad_service_code(sk, service)) { | |
853 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
854 | goto drop; | |
855 | } | |
856 | /* | |
857 | * There are no SYN attacks on IPv6, yet... | |
858 | */ | |
859 | if (inet_csk_reqsk_queue_is_full(sk)) | |
860 | goto drop; | |
861 | ||
862 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
863 | goto drop; | |
864 | ||
865 | req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot); | |
866 | if (req == NULL) | |
867 | goto drop; | |
868 | ||
869 | /* FIXME: process options */ | |
870 | ||
871 | dccp_openreq_init(req, &dp, skb); | |
872 | ||
873 | ireq6 = inet6_rsk(req); | |
874 | ireq = inet_rsk(req); | |
875 | ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr); | |
876 | ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr); | |
877 | req->rcv_wnd = 100; /* Fake, option parsing will get the | |
878 | right value */ | |
879 | ireq6->pktopts = NULL; | |
880 | ||
881 | if (ipv6_opt_accepted(sk, skb) || | |
882 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
883 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
884 | atomic_inc(&skb->users); | |
885 | ireq6->pktopts = skb; | |
886 | } | |
887 | ireq6->iif = sk->sk_bound_dev_if; | |
888 | ||
889 | /* So that link locals have meaning */ | |
890 | if (!sk->sk_bound_dev_if && | |
891 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
892 | ireq6->iif = inet6_iif(skb); | |
893 | ||
894 | /* | |
895 | * Step 3: Process LISTEN state | |
896 | * | |
897 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
898 | * | |
899 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
900 | * dccp_create_openreq_child. | |
901 | */ | |
902 | dreq = dccp_rsk(req); | |
903 | dreq->dreq_isr = dcb->dccpd_seq; | |
904 | dreq->dreq_iss = dccp_v6_init_sequence(sk, skb); | |
905 | dreq->dreq_service = service; | |
906 | ||
907 | if (dccp_v6_send_response(sk, req, NULL)) | |
908 | goto drop_and_free; | |
909 | ||
910 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
911 | return 0; | |
912 | ||
913 | drop_and_free: | |
914 | reqsk_free(req); | |
915 | drop: | |
916 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
917 | dcb->dccpd_reset_code = reset_code; | |
918 | return -1; | |
919 | } | |
920 | ||
921 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
922 | struct sk_buff *skb, | |
923 | struct request_sock *req, | |
924 | struct dst_entry *dst) | |
925 | { | |
926 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
927 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
928 | struct inet_sock *newinet; | |
929 | struct dccp_sock *newdp; | |
930 | struct dccp6_sock *newdp6; | |
931 | struct sock *newsk; | |
932 | struct ipv6_txoptions *opt; | |
933 | ||
934 | if (skb->protocol == htons(ETH_P_IP)) { | |
935 | /* | |
936 | * v6 mapped | |
937 | */ | |
938 | ||
939 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); | |
940 | if (newsk == NULL) | |
941 | return NULL; | |
942 | ||
943 | newdp6 = (struct dccp6_sock *)newsk; | |
944 | newdp = dccp_sk(newsk); | |
945 | newinet = inet_sk(newsk); | |
946 | newinet->pinet6 = &newdp6->inet6; | |
947 | newnp = inet6_sk(newsk); | |
948 | ||
949 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
950 | ||
951 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
952 | newinet->daddr); | |
953 | ||
954 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
955 | newinet->saddr); | |
956 | ||
957 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
958 | ||
959 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
960 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
961 | newnp->pktoptions = NULL; | |
962 | newnp->opt = NULL; | |
963 | newnp->mcast_oif = inet6_iif(skb); | |
964 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
965 | ||
966 | /* | |
967 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
968 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
969 | * that function for the gory details. -acme | |
970 | */ | |
971 | ||
972 | /* It is tricky place. Until this moment IPv4 tcp | |
973 | worked with IPv6 icsk.icsk_af_ops. | |
974 | Sync it now. | |
975 | */ | |
976 | dccp_sync_mss(newsk, newdp->dccps_pmtu_cookie); | |
977 | ||
978 | return newsk; | |
979 | } | |
980 | ||
981 | opt = np->opt; | |
982 | ||
983 | if (sk_acceptq_is_full(sk)) | |
984 | goto out_overflow; | |
985 | ||
986 | if (np->rxopt.bits.osrcrt == 2 && | |
987 | opt == NULL && ireq6->pktopts) { | |
988 | struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts); | |
989 | if (rxopt->srcrt) | |
990 | opt = ipv6_invert_rthdr(sk, | |
991 | (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw + | |
992 | rxopt->srcrt)); | |
993 | } | |
994 | ||
995 | if (dst == NULL) { | |
996 | struct in6_addr *final_p = NULL, final; | |
997 | struct flowi fl; | |
998 | ||
999 | memset(&fl, 0, sizeof(fl)); | |
1000 | fl.proto = IPPROTO_DCCP; | |
1001 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
1002 | if (opt && opt->srcrt) { | |
1003 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
1004 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1005 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1006 | final_p = &final; | |
1007 | } | |
1008 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
1009 | fl.oif = sk->sk_bound_dev_if; | |
1010 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
1011 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
1012 | ||
1013 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
1014 | goto out; | |
1015 | ||
1016 | if (final_p) | |
1017 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1018 | ||
1019 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
1020 | goto out; | |
1021 | } | |
1022 | ||
1023 | newsk = dccp_create_openreq_child(sk, req, skb); | |
1024 | if (newsk == NULL) | |
1025 | goto out; | |
1026 | ||
1027 | /* | |
1028 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1029 | * count here, dccp_create_openreq_child now does this for us, see the | |
1030 | * comment in that function for the gory details. -acme | |
1031 | */ | |
1032 | ||
1033 | ip6_dst_store(newsk, dst, NULL); | |
1034 | newsk->sk_route_caps = dst->dev->features & | |
1035 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
1036 | ||
1037 | newdp6 = (struct dccp6_sock *)newsk; | |
1038 | newinet = inet_sk(newsk); | |
1039 | newinet->pinet6 = &newdp6->inet6; | |
1040 | newdp = dccp_sk(newsk); | |
1041 | newnp = inet6_sk(newsk); | |
1042 | ||
1043 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1044 | ||
1045 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
1046 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
1047 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
1048 | newsk->sk_bound_dev_if = ireq6->iif; | |
1049 | ||
1050 | /* Now IPv6 options... | |
1051 | ||
1052 | First: no IPv4 options. | |
1053 | */ | |
1054 | newinet->opt = NULL; | |
1055 | ||
1056 | /* Clone RX bits */ | |
1057 | newnp->rxopt.all = np->rxopt.all; | |
1058 | ||
1059 | /* Clone pktoptions received with SYN */ | |
1060 | newnp->pktoptions = NULL; | |
1061 | if (ireq6->pktopts != NULL) { | |
1062 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
1063 | kfree_skb(ireq6->pktopts); | |
1064 | ireq6->pktopts = NULL; | |
1065 | if (newnp->pktoptions) | |
1066 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1067 | } | |
1068 | newnp->opt = NULL; | |
1069 | newnp->mcast_oif = inet6_iif(skb); | |
1070 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
1071 | ||
1072 | /* Clone native IPv6 options from listening socket (if any) | |
1073 | ||
1074 | Yes, keeping reference count would be much more clever, | |
1075 | but we make one more one thing there: reattach optmem | |
1076 | to newsk. | |
1077 | */ | |
1078 | if (opt) { | |
1079 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1080 | if (opt != np->opt) | |
1081 | sock_kfree_s(sk, opt, opt->tot_len); | |
1082 | } | |
1083 | ||
1084 | newdp->dccps_ext_header_len = 0; | |
1085 | if (newnp->opt) | |
1086 | newdp->dccps_ext_header_len = newnp->opt->opt_nflen + | |
1087 | newnp->opt->opt_flen; | |
1088 | ||
1089 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
1090 | ||
1091 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
1092 | ||
1093 | __inet6_hash(&dccp_hashinfo, newsk); | |
1094 | inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
1095 | ||
1096 | return newsk; | |
1097 | ||
1098 | out_overflow: | |
1099 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
1100 | out: | |
1101 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
1102 | if (opt && opt != np->opt) | |
1103 | sock_kfree_s(sk, opt, opt->tot_len); | |
1104 | dst_release(dst); | |
1105 | return NULL; | |
1106 | } | |
1107 | ||
1108 | /* The socket must have it's spinlock held when we get | |
1109 | * here. | |
1110 | * | |
1111 | * We have a potential double-lock case here, so even when | |
1112 | * doing backlog processing we use the BH locking scheme. | |
1113 | * This is because we cannot sleep with the original spinlock | |
1114 | * held. | |
1115 | */ | |
1116 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1117 | { | |
1118 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1119 | struct sk_buff *opt_skb = NULL; | |
1120 | ||
1121 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1122 | goes to IPv4 receive handler and backlogged. | |
1123 | From backlog it always goes here. Kerboom... | |
1124 | Fortunately, dccp_rcv_established and rcv_established | |
1125 | handle them correctly, but it is not case with | |
1126 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
1127 | */ | |
1128 | ||
1129 | if (skb->protocol == htons(ETH_P_IP)) | |
1130 | return dccp_v4_do_rcv(sk, skb); | |
1131 | ||
1132 | if (sk_filter(sk, skb, 0)) | |
1133 | goto discard; | |
1134 | ||
1135 | /* | |
1136 | * socket locking is here for SMP purposes as backlog rcv | |
1137 | * is currently called with bh processing disabled. | |
1138 | */ | |
1139 | ||
1140 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1141 | ||
1142 | Yes, guys, it is the only place in our code, where we | |
1143 | may make it not affecting IPv4. | |
1144 | The rest of code is protocol independent, | |
1145 | and I do not like idea to uglify IPv4. | |
1146 | ||
1147 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1148 | looks not very well thought. For now we latch | |
1149 | options, received in the last packet, enqueued | |
1150 | by tcp. Feel free to propose better solution. | |
1151 | --ANK (980728) | |
1152 | */ | |
1153 | if (np->rxopt.all) | |
1154 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1155 | ||
1156 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
1157 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
1158 | goto reset; | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | if (sk->sk_state == DCCP_LISTEN) { | |
1163 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); | |
1164 | if (!nsk) | |
1165 | goto discard; | |
1166 | ||
1167 | /* | |
1168 | * Queue it on the new socket if the new socket is active, | |
1169 | * otherwise we just shortcircuit this and continue with | |
1170 | * the new socket.. | |
1171 | */ | |
1172 | if(nsk != sk) { | |
1173 | if (dccp_child_process(sk, nsk, skb)) | |
1174 | goto reset; | |
1175 | if (opt_skb) | |
1176 | __kfree_skb(opt_skb); | |
1177 | return 0; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
1182 | goto reset; | |
1183 | return 0; | |
1184 | ||
1185 | reset: | |
1186 | dccp_v6_ctl_send_reset(skb); | |
1187 | discard: | |
1188 | if (opt_skb) | |
1189 | __kfree_skb(opt_skb); | |
1190 | kfree_skb(skb); | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | static int dccp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
1195 | { | |
1196 | const struct dccp_hdr *dh; | |
1197 | struct sk_buff *skb = *pskb; | |
1198 | struct sock *sk; | |
1199 | int rc; | |
1200 | ||
1201 | /* Step 1: Check header basics: */ | |
1202 | ||
1203 | if (dccp_invalid_packet(skb)) | |
1204 | goto discard_it; | |
1205 | ||
1206 | dh = dccp_hdr(skb); | |
1207 | ||
1208 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); | |
1209 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
1210 | ||
1211 | if (dccp_packet_without_ack(skb)) | |
1212 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
1213 | else | |
1214 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
1215 | ||
1216 | /* Step 2: | |
1217 | * Look up flow ID in table and get corresponding socket */ | |
1218 | sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr, | |
1219 | dh->dccph_sport, | |
1220 | &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport), | |
1221 | inet6_iif(skb)); | |
1222 | /* | |
1223 | * Step 2: | |
1224 | * If no socket ... | |
1225 | * Generate Reset(No Connection) unless P.type == Reset | |
1226 | * Drop packet and return | |
1227 | */ | |
1228 | if (sk == NULL) | |
1229 | goto no_dccp_socket; | |
1230 | ||
1231 | /* | |
1232 | * Step 2: | |
1233 | * ... or S.state == TIMEWAIT, | |
1234 | * Generate Reset(No Connection) unless P.type == Reset | |
1235 | * Drop packet and return | |
1236 | */ | |
1237 | ||
1238 | if (sk->sk_state == DCCP_TIME_WAIT) | |
1239 | goto do_time_wait; | |
1240 | ||
1241 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1242 | goto discard_and_relse; | |
1243 | ||
1244 | if (sk_filter(sk, skb, 0)) | |
1245 | goto discard_and_relse; | |
1246 | ||
1247 | skb->dev = NULL; | |
1248 | ||
1249 | bh_lock_sock(sk); | |
1250 | rc = 0; | |
1251 | if (!sock_owned_by_user(sk)) | |
1252 | rc = dccp_v6_do_rcv(sk, skb); | |
1253 | else | |
1254 | sk_add_backlog(sk, skb); | |
1255 | bh_unlock_sock(sk); | |
1256 | ||
1257 | sock_put(sk); | |
1258 | return rc ? -1 : 0; | |
1259 | ||
1260 | no_dccp_socket: | |
1261 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1262 | goto discard_it; | |
1263 | /* | |
1264 | * Step 2: | |
1265 | * Generate Reset(No Connection) unless P.type == Reset | |
1266 | * Drop packet and return | |
1267 | */ | |
1268 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
1269 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
1270 | DCCP_RESET_CODE_NO_CONNECTION; | |
1271 | dccp_v6_ctl_send_reset(skb); | |
1272 | } | |
1273 | discard_it: | |
1274 | ||
1275 | /* | |
1276 | * Discard frame | |
1277 | */ | |
1278 | ||
1279 | kfree_skb(skb); | |
1280 | return 0; | |
1281 | ||
1282 | discard_and_relse: | |
1283 | sock_put(sk); | |
1284 | goto discard_it; | |
1285 | ||
1286 | do_time_wait: | |
1287 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
1288 | goto no_dccp_socket; | |
1289 | } | |
1290 | ||
1291 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { | |
1292 | .queue_xmit = inet6_csk_xmit, | |
1293 | .send_check = dccp_v6_send_check, | |
1294 | .rebuild_header = inet6_sk_rebuild_header, | |
1295 | .conn_request = dccp_v6_conn_request, | |
1296 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1297 | .net_header_len = sizeof(struct ipv6hdr), | |
1298 | .setsockopt = ipv6_setsockopt, | |
1299 | .getsockopt = ipv6_getsockopt, | |
1300 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1301 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1302 | }; | |
1303 | ||
1304 | /* | |
1305 | * DCCP over IPv4 via INET6 API | |
1306 | */ | |
1307 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
1308 | .queue_xmit = ip_queue_xmit, | |
1309 | .send_check = dccp_v4_send_check, | |
1310 | .rebuild_header = inet_sk_rebuild_header, | |
1311 | .conn_request = dccp_v6_conn_request, | |
1312 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1313 | .net_header_len = sizeof(struct iphdr), | |
1314 | .setsockopt = ipv6_setsockopt, | |
1315 | .getsockopt = ipv6_getsockopt, | |
1316 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1317 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1318 | }; | |
1319 | ||
1320 | /* NOTE: A lot of things set to zero explicitly by call to | |
1321 | * sk_alloc() so need not be done here. | |
1322 | */ | |
1323 | static int dccp_v6_init_sock(struct sock *sk) | |
1324 | { | |
1325 | int err = dccp_v4_init_sock(sk); | |
1326 | ||
1327 | if (err == 0) | |
1328 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; | |
1329 | ||
1330 | return err; | |
1331 | } | |
1332 | ||
1333 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1334 | { | |
1335 | dccp_v4_destroy_sock(sk); | |
1336 | return inet6_destroy_sock(sk); | |
1337 | } | |
1338 | ||
1339 | static struct proto dccp_v6_prot = { | |
1340 | .name = "DCCPv6", | |
1341 | .owner = THIS_MODULE, | |
1342 | .close = dccp_close, | |
1343 | .connect = dccp_v6_connect, | |
1344 | .disconnect = dccp_disconnect, | |
1345 | .ioctl = dccp_ioctl, | |
1346 | .init = dccp_v6_init_sock, | |
1347 | .setsockopt = dccp_setsockopt, | |
1348 | .getsockopt = dccp_getsockopt, | |
1349 | .sendmsg = dccp_sendmsg, | |
1350 | .recvmsg = dccp_recvmsg, | |
1351 | .backlog_rcv = dccp_v6_do_rcv, | |
1352 | .hash = dccp_v6_hash, | |
1353 | .unhash = dccp_unhash, | |
1354 | .accept = inet_csk_accept, | |
1355 | .get_port = dccp_v6_get_port, | |
1356 | .shutdown = dccp_shutdown, | |
1357 | .destroy = dccp_v6_destroy_sock, | |
1358 | .orphan_count = &dccp_orphan_count, | |
1359 | .max_header = MAX_DCCP_HEADER, | |
1360 | .obj_size = sizeof(struct dccp6_sock), | |
1361 | .rsk_prot = &dccp6_request_sock_ops, | |
1362 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1363 | }; | |
1364 | ||
1365 | static struct inet6_protocol dccp_v6_protocol = { | |
1366 | .handler = dccp_v6_rcv, | |
1367 | .err_handler = dccp_v6_err, | |
1368 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
1369 | }; | |
1370 | ||
1371 | static struct proto_ops inet6_dccp_ops = { | |
1372 | .family = PF_INET6, | |
1373 | .owner = THIS_MODULE, | |
1374 | .release = inet6_release, | |
1375 | .bind = inet6_bind, | |
1376 | .connect = inet_stream_connect, | |
1377 | .socketpair = sock_no_socketpair, | |
1378 | .accept = inet_accept, | |
1379 | .getname = inet6_getname, | |
1380 | .poll = dccp_poll, | |
1381 | .ioctl = inet6_ioctl, | |
1382 | .listen = inet_dccp_listen, | |
1383 | .shutdown = inet_shutdown, | |
1384 | .setsockopt = sock_common_setsockopt, | |
1385 | .getsockopt = sock_common_getsockopt, | |
1386 | .sendmsg = inet_sendmsg, | |
1387 | .recvmsg = sock_common_recvmsg, | |
1388 | .mmap = sock_no_mmap, | |
1389 | .sendpage = sock_no_sendpage, | |
1390 | }; | |
1391 | ||
1392 | static struct inet_protosw dccp_v6_protosw = { | |
1393 | .type = SOCK_DCCP, | |
1394 | .protocol = IPPROTO_DCCP, | |
1395 | .prot = &dccp_v6_prot, | |
1396 | .ops = &inet6_dccp_ops, | |
1397 | .capability = -1, | |
1398 | }; | |
1399 | ||
1400 | static int __init dccp_v6_init(void) | |
1401 | { | |
1402 | int err = proto_register(&dccp_v6_prot, 1); | |
1403 | ||
1404 | if (err != 0) | |
1405 | goto out; | |
1406 | ||
1407 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1408 | if (err != 0) | |
1409 | goto out_unregister_proto; | |
1410 | ||
1411 | inet6_register_protosw(&dccp_v6_protosw); | |
1412 | out: | |
1413 | return err; | |
1414 | out_unregister_proto: | |
1415 | proto_unregister(&dccp_v6_prot); | |
1416 | goto out; | |
1417 | } | |
1418 | ||
1419 | static void __exit dccp_v6_exit(void) | |
1420 | { | |
1421 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1422 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1423 | proto_unregister(&dccp_v6_prot); | |
1424 | } | |
1425 | ||
1426 | module_init(dccp_v6_init); | |
1427 | module_exit(dccp_v6_exit); | |
1428 | ||
1429 | /* | |
1430 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1431 | * values directly, Also cover the case where the protocol is not specified, | |
1432 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1433 | */ | |
1434 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); | |
1435 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); | |
1436 | MODULE_LICENSE("GPL"); | |
1437 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1438 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |