Commit | Line | Data |
---|---|---|
3df80d93 ACM |
1 | /* |
2 | * DCCP over IPv6 | |
45329e71 | 3 | * Linux INET6 implementation |
3df80d93 ACM |
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 | ||
3df80d93 ACM |
15 | #include <linux/module.h> |
16 | #include <linux/random.h> | |
17 | #include <linux/xfrm.h> | |
18 | ||
19 | #include <net/addrconf.h> | |
20 | #include <net/inet_common.h> | |
21 | #include <net/inet_hashtables.h> | |
14c85021 | 22 | #include <net/inet_sock.h> |
3df80d93 ACM |
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> | |
aa0e4e4a | 29 | #include <net/ip6_checksum.h> |
3df80d93 ACM |
30 | #include <net/xfrm.h> |
31 | ||
32 | #include "dccp.h" | |
33 | #include "ipv6.h" | |
34 | ||
72478873 ACM |
35 | /* Socket used for sending RSTs and ACKs */ |
36 | static struct socket *dccp_v6_ctl_socket; | |
37 | ||
3df80d93 ACM |
38 | static void dccp_v6_ctl_send_reset(struct sk_buff *skb); |
39 | static void dccp_v6_reqsk_send_ack(struct sk_buff *skb, | |
40 | struct request_sock *req); | |
41 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
42 | ||
43 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
44 | ||
45 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; | |
46 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
47 | ||
48 | static int dccp_v6_get_port(struct sock *sk, unsigned short snum) | |
49 | { | |
50 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, | |
51 | inet6_csk_bind_conflict); | |
52 | } | |
53 | ||
54 | static void dccp_v6_hash(struct sock *sk) | |
55 | { | |
56 | if (sk->sk_state != DCCP_CLOSED) { | |
57 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
c985ed70 | 58 | dccp_hash(sk); |
3df80d93 ACM |
59 | return; |
60 | } | |
61 | local_bh_disable(); | |
62 | __inet6_hash(&dccp_hashinfo, sk); | |
63 | local_bh_enable(); | |
64 | } | |
65 | } | |
66 | ||
67 | static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len, | |
45329e71 ACM |
68 | struct in6_addr *saddr, |
69 | struct in6_addr *daddr, | |
3df80d93 ACM |
70 | unsigned long base) |
71 | { | |
72 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base); | |
73 | } | |
74 | ||
75 | static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
76 | { | |
77 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
78 | ||
79 | if (skb->protocol == htons(ETH_P_IPV6)) | |
80 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
81 | skb->nh.ipv6h->saddr.s6_addr32, | |
82 | dh->dccph_dport, | |
83 | dh->dccph_sport); | |
45329e71 ACM |
84 | |
85 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
86 | skb->nh.iph->saddr, | |
87 | dh->dccph_dport, | |
88 | dh->dccph_sport); | |
3df80d93 ACM |
89 | } |
90 | ||
45329e71 | 91 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
3df80d93 ACM |
92 | int addr_len) |
93 | { | |
45329e71 | 94 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; |
d83d8461 | 95 | struct inet_connection_sock *icsk = inet_csk(sk); |
3df80d93 ACM |
96 | struct inet_sock *inet = inet_sk(sk); |
97 | struct ipv6_pinfo *np = inet6_sk(sk); | |
98 | struct dccp_sock *dp = dccp_sk(sk); | |
99 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
100 | struct flowi fl; | |
101 | struct dst_entry *dst; | |
102 | int addr_type; | |
103 | int err; | |
104 | ||
105 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
106 | ||
45329e71 | 107 | if (addr_len < SIN6_LEN_RFC2133) |
3df80d93 ACM |
108 | return -EINVAL; |
109 | ||
45329e71 | 110 | if (usin->sin6_family != AF_INET6) |
3df80d93 ACM |
111 | return -EAFNOSUPPORT; |
112 | ||
113 | memset(&fl, 0, sizeof(fl)); | |
114 | ||
115 | if (np->sndflow) { | |
116 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
117 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
118 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
119 | struct ip6_flowlabel *flowlabel; | |
120 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
121 | if (flowlabel == NULL) | |
122 | return -EINVAL; | |
123 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
124 | fl6_sock_release(flowlabel); | |
125 | } | |
126 | } | |
3df80d93 | 127 | /* |
45329e71 ACM |
128 | * connect() to INADDR_ANY means loopback (BSD'ism). |
129 | */ | |
130 | if (ipv6_addr_any(&usin->sin6_addr)) | |
131 | usin->sin6_addr.s6_addr[15] = 1; | |
3df80d93 ACM |
132 | |
133 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
134 | ||
45329e71 | 135 | if (addr_type & IPV6_ADDR_MULTICAST) |
3df80d93 ACM |
136 | return -ENETUNREACH; |
137 | ||
138 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
139 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
140 | usin->sin6_scope_id) { | |
141 | /* If interface is set while binding, indices | |
142 | * must coincide. | |
143 | */ | |
144 | if (sk->sk_bound_dev_if && | |
145 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
146 | return -EINVAL; | |
147 | ||
148 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
149 | } | |
150 | ||
151 | /* Connect to link-local address requires an interface */ | |
152 | if (!sk->sk_bound_dev_if) | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
157 | np->flow_label = fl.fl6_flowlabel; | |
158 | ||
159 | /* | |
45329e71 | 160 | * DCCP over IPv4 |
3df80d93 | 161 | */ |
3df80d93 | 162 | if (addr_type == IPV6_ADDR_MAPPED) { |
d83d8461 | 163 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
3df80d93 ACM |
164 | struct sockaddr_in sin; |
165 | ||
166 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
167 | ||
168 | if (__ipv6_only_sock(sk)) | |
169 | return -ENETUNREACH; | |
170 | ||
171 | sin.sin_family = AF_INET; | |
172 | sin.sin_port = usin->sin6_port; | |
173 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
174 | ||
d83d8461 | 175 | icsk->icsk_af_ops = &dccp_ipv6_mapped; |
3df80d93 ACM |
176 | sk->sk_backlog_rcv = dccp_v4_do_rcv; |
177 | ||
178 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
3df80d93 | 179 | if (err) { |
d83d8461 ACM |
180 | icsk->icsk_ext_hdr_len = exthdrlen; |
181 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
3df80d93 ACM |
182 | sk->sk_backlog_rcv = dccp_v6_do_rcv; |
183 | goto failure; | |
184 | } else { | |
185 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
186 | inet->saddr); | |
187 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
188 | inet->rcv_saddr); | |
189 | } | |
190 | ||
191 | return err; | |
192 | } | |
193 | ||
194 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
195 | saddr = &np->rcv_saddr; | |
196 | ||
197 | fl.proto = IPPROTO_DCCP; | |
198 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
199 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
200 | fl.oif = sk->sk_bound_dev_if; | |
201 | fl.fl_ip_dport = usin->sin6_port; | |
202 | fl.fl_ip_sport = inet->sport; | |
203 | ||
45329e71 ACM |
204 | if (np->opt != NULL && np->opt->srcrt != NULL) { |
205 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
206 | ||
3df80d93 ACM |
207 | ipv6_addr_copy(&final, &fl.fl6_dst); |
208 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
209 | final_p = &final; | |
210 | } | |
211 | ||
212 | err = ip6_dst_lookup(sk, &dst, &fl); | |
213 | if (err) | |
214 | goto failure; | |
45329e71 | 215 | |
3df80d93 ACM |
216 | if (final_p) |
217 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
218 | ||
45329e71 ACM |
219 | err = xfrm_lookup(&dst, &fl, sk, 0); |
220 | if (err < 0) | |
3df80d93 ACM |
221 | goto failure; |
222 | ||
223 | if (saddr == NULL) { | |
224 | saddr = &fl.fl6_src; | |
225 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
226 | } | |
227 | ||
228 | /* set the source address */ | |
229 | ipv6_addr_copy(&np->saddr, saddr); | |
230 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
231 | ||
232 | ip6_dst_store(sk, dst, NULL); | |
233 | ||
d83d8461 | 234 | icsk->icsk_ext_hdr_len = 0; |
45329e71 | 235 | if (np->opt != NULL) |
d83d8461 ACM |
236 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
237 | np->opt->opt_nflen); | |
3df80d93 ACM |
238 | |
239 | inet->dport = usin->sin6_port; | |
240 | ||
241 | dccp_set_state(sk, DCCP_REQUESTING); | |
d8313f5c | 242 | err = inet6_hash_connect(&dccp_death_row, sk); |
3df80d93 ACM |
243 | if (err) |
244 | goto late_failure; | |
245 | /* FIXME */ | |
246 | #if 0 | |
247 | dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32, | |
248 | np->daddr.s6_addr32, | |
249 | inet->sport, | |
250 | inet->dport); | |
251 | #endif | |
252 | err = dccp_connect(sk); | |
253 | if (err) | |
254 | goto late_failure; | |
255 | ||
256 | return 0; | |
257 | ||
258 | late_failure: | |
259 | dccp_set_state(sk, DCCP_CLOSED); | |
260 | __sk_dst_reset(sk); | |
261 | failure: | |
262 | inet->dport = 0; | |
263 | sk->sk_route_caps = 0; | |
264 | return err; | |
265 | } | |
266 | ||
267 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
60fe62e7 | 268 | int type, int code, int offset, __be32 info) |
3df80d93 ACM |
269 | { |
270 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; | |
271 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
272 | struct ipv6_pinfo *np; | |
273 | struct sock *sk; | |
274 | int err; | |
275 | __u64 seq; | |
276 | ||
277 | sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, | |
278 | &hdr->saddr, dh->dccph_sport, skb->dev->ifindex); | |
279 | ||
280 | if (sk == NULL) { | |
281 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
282 | return; | |
283 | } | |
284 | ||
285 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
286 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
287 | return; | |
288 | } | |
289 | ||
290 | bh_lock_sock(sk); | |
291 | if (sock_owned_by_user(sk)) | |
292 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
293 | ||
294 | if (sk->sk_state == DCCP_CLOSED) | |
295 | goto out; | |
296 | ||
297 | np = inet6_sk(sk); | |
298 | ||
299 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
300 | struct dst_entry *dst = NULL; |
301 | ||
302 | if (sock_owned_by_user(sk)) | |
303 | goto out; | |
304 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
305 | goto out; | |
306 | ||
307 | /* icmp should have updated the destination cache entry */ | |
308 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
309 | if (dst == NULL) { |
310 | struct inet_sock *inet = inet_sk(sk); | |
311 | struct flowi fl; | |
312 | ||
313 | /* BUGGG_FUTURE: Again, it is not clear how | |
314 | to handle rthdr case. Ignore this complexity | |
315 | for now. | |
316 | */ | |
317 | memset(&fl, 0, sizeof(fl)); | |
318 | fl.proto = IPPROTO_DCCP; | |
319 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
320 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
321 | fl.oif = sk->sk_bound_dev_if; | |
322 | fl.fl_ip_dport = inet->dport; | |
323 | fl.fl_ip_sport = inet->sport; | |
324 | ||
45329e71 ACM |
325 | err = ip6_dst_lookup(sk, &dst, &fl); |
326 | if (err) { | |
3df80d93 ACM |
327 | sk->sk_err_soft = -err; |
328 | goto out; | |
329 | } | |
330 | ||
45329e71 ACM |
331 | err = xfrm_lookup(&dst, &fl, sk, 0); |
332 | if (err < 0) { | |
3df80d93 ACM |
333 | sk->sk_err_soft = -err; |
334 | goto out; | |
335 | } | |
3df80d93 ACM |
336 | } else |
337 | dst_hold(dst); | |
338 | ||
d83d8461 | 339 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
340 | dccp_sync_mss(sk, dst_mtu(dst)); |
341 | } /* else let the usual retransmit timer handle it */ | |
342 | dst_release(dst); | |
343 | goto out; | |
344 | } | |
345 | ||
346 | icmpv6_err_convert(type, code, &err); | |
347 | ||
348 | seq = DCCP_SKB_CB(skb)->dccpd_seq; | |
349 | /* Might be for an request_sock */ | |
350 | switch (sk->sk_state) { | |
351 | struct request_sock *req, **prev; | |
352 | case DCCP_LISTEN: | |
353 | if (sock_owned_by_user(sk)) | |
354 | goto out; | |
355 | ||
356 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
357 | &hdr->daddr, &hdr->saddr, | |
358 | inet6_iif(skb)); | |
45329e71 | 359 | if (req == NULL) |
3df80d93 ACM |
360 | goto out; |
361 | ||
45329e71 ACM |
362 | /* |
363 | * ICMPs are not backlogged, hence we cannot get an established | |
364 | * socket here. | |
3df80d93 ACM |
365 | */ |
366 | BUG_TRAP(req->sk == NULL); | |
367 | ||
368 | if (seq != dccp_rsk(req)->dreq_iss) { | |
369 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
370 | goto out; | |
371 | } | |
372 | ||
373 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
374 | goto out; | |
375 | ||
376 | case DCCP_REQUESTING: | |
377 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 378 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
379 | if (!sock_owned_by_user(sk)) { |
380 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
381 | sk->sk_err = err; | |
382 | /* | |
383 | * Wake people up to see the error | |
384 | * (see connect in sock.c) | |
385 | */ | |
386 | sk->sk_error_report(sk); | |
3df80d93 ACM |
387 | dccp_done(sk); |
388 | } else | |
389 | sk->sk_err_soft = err; | |
390 | goto out; | |
391 | } | |
392 | ||
393 | if (!sock_owned_by_user(sk) && np->recverr) { | |
394 | sk->sk_err = err; | |
395 | sk->sk_error_report(sk); | |
396 | } else | |
397 | sk->sk_err_soft = err; | |
398 | ||
399 | out: | |
400 | bh_unlock_sock(sk); | |
401 | sock_put(sk); | |
402 | } | |
403 | ||
404 | ||
405 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, | |
406 | struct dst_entry *dst) | |
407 | { | |
408 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
409 | struct ipv6_pinfo *np = inet6_sk(sk); | |
410 | struct sk_buff *skb; | |
411 | struct ipv6_txoptions *opt = NULL; | |
412 | struct in6_addr *final_p = NULL, final; | |
413 | struct flowi fl; | |
414 | int err = -1; | |
415 | ||
416 | memset(&fl, 0, sizeof(fl)); | |
417 | fl.proto = IPPROTO_DCCP; | |
418 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
419 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
420 | fl.fl6_flowlabel = 0; | |
421 | fl.oif = ireq6->iif; | |
422 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
423 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
424 | ||
425 | if (dst == NULL) { | |
426 | opt = np->opt; | |
427 | if (opt == NULL && | |
428 | np->rxopt.bits.osrcrt == 2 && | |
429 | ireq6->pktopts) { | |
430 | struct sk_buff *pktopts = ireq6->pktopts; | |
431 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); | |
45329e71 | 432 | |
3df80d93 ACM |
433 | if (rxopt->srcrt) |
434 | opt = ipv6_invert_rthdr(sk, | |
435 | (struct ipv6_rt_hdr *)(pktopts->nh.raw + | |
436 | rxopt->srcrt)); | |
437 | } | |
438 | ||
45329e71 ACM |
439 | if (opt != NULL && opt->srcrt != NULL) { |
440 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
441 | ||
3df80d93 ACM |
442 | ipv6_addr_copy(&final, &fl.fl6_dst); |
443 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
444 | final_p = &final; | |
445 | } | |
446 | ||
447 | err = ip6_dst_lookup(sk, &dst, &fl); | |
448 | if (err) | |
449 | goto done; | |
45329e71 | 450 | |
3df80d93 ACM |
451 | if (final_p) |
452 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 ACM |
453 | |
454 | err = xfrm_lookup(&dst, &fl, sk, 0); | |
455 | if (err < 0) | |
3df80d93 ACM |
456 | goto done; |
457 | } | |
458 | ||
459 | skb = dccp_make_response(sk, dst, req); | |
460 | if (skb != NULL) { | |
461 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 462 | |
3df80d93 ACM |
463 | dh->dccph_checksum = dccp_v6_check(dh, skb->len, |
464 | &ireq6->loc_addr, | |
465 | &ireq6->rmt_addr, | |
466 | csum_partial((char *)dh, | |
467 | skb->len, | |
468 | skb->csum)); | |
469 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
470 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
471 | if (err == NET_XMIT_CN) | |
472 | err = 0; | |
473 | } | |
474 | ||
475 | done: | |
45329e71 | 476 | if (opt != NULL && opt != np->opt) |
3df80d93 | 477 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 478 | dst_release(dst); |
3df80d93 ACM |
479 | return err; |
480 | } | |
481 | ||
482 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
483 | { | |
484 | if (inet6_rsk(req)->pktopts != NULL) | |
485 | kfree_skb(inet6_rsk(req)->pktopts); | |
486 | } | |
487 | ||
488 | static struct request_sock_ops dccp6_request_sock_ops = { | |
489 | .family = AF_INET6, | |
490 | .obj_size = sizeof(struct dccp6_request_sock), | |
491 | .rtx_syn_ack = dccp_v6_send_response, | |
492 | .send_ack = dccp_v6_reqsk_send_ack, | |
493 | .destructor = dccp_v6_reqsk_destructor, | |
494 | .send_reset = dccp_v6_ctl_send_reset, | |
495 | }; | |
496 | ||
6d6ee43e ACM |
497 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
498 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
499 | }; | |
500 | ||
3df80d93 ACM |
501 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
502 | { | |
503 | struct ipv6_pinfo *np = inet6_sk(sk); | |
504 | struct dccp_hdr *dh = dccp_hdr(skb); | |
505 | ||
506 | dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr, | |
45329e71 | 507 | len, IPPROTO_DCCP, |
3df80d93 ACM |
508 | csum_partial((char *)dh, |
509 | dh->dccph_doff << 2, | |
510 | skb->csum)); | |
511 | } | |
512 | ||
513 | static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb) | |
514 | { | |
45329e71 | 515 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; |
118b2c95 | 516 | const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) + |
3df80d93 ACM |
517 | sizeof(struct dccp_hdr_ext) + |
518 | sizeof(struct dccp_hdr_reset); | |
519 | struct sk_buff *skb; | |
520 | struct flowi fl; | |
521 | u64 seqno; | |
522 | ||
523 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
524 | return; | |
525 | ||
526 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 527 | return; |
3df80d93 | 528 | |
118b2c95 ACM |
529 | skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
530 | GFP_ATOMIC); | |
45329e71 | 531 | if (skb == NULL) |
3df80d93 ACM |
532 | return; |
533 | ||
118b2c95 | 534 | skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
3df80d93 ACM |
535 | |
536 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
537 | dh = dccp_hdr(skb); | |
538 | memset(dh, 0, dccp_hdr_reset_len); | |
539 | ||
540 | /* Swap the send and the receive. */ | |
541 | dh->dccph_type = DCCP_PKT_RESET; | |
542 | dh->dccph_sport = rxdh->dccph_dport; | |
543 | dh->dccph_dport = rxdh->dccph_sport; | |
544 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
545 | dh->dccph_x = 1; | |
546 | dccp_hdr_reset(skb)->dccph_reset_code = | |
547 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
548 | ||
549 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ | |
550 | seqno = 0; | |
551 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
552 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
553 | ||
554 | dccp_hdr_set_seq(dh, seqno); | |
555 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
556 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
557 | ||
558 | memset(&fl, 0, sizeof(fl)); | |
559 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
560 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
561 | dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
562 | sizeof(*dh), IPPROTO_DCCP, | |
563 | skb->csum); | |
564 | fl.proto = IPPROTO_DCCP; | |
565 | fl.oif = inet6_iif(rxskb); | |
566 | fl.fl_ip_dport = dh->dccph_dport; | |
567 | fl.fl_ip_sport = dh->dccph_sport; | |
568 | ||
569 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
570 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
571 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 572 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
573 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
574 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
575 | return; | |
576 | } | |
577 | } | |
578 | ||
579 | kfree_skb(skb); | |
580 | } | |
581 | ||
c5fed159 ACM |
582 | static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb, |
583 | struct request_sock *req) | |
3df80d93 ACM |
584 | { |
585 | struct flowi fl; | |
586 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
118b2c95 | 587 | const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) + |
3df80d93 ACM |
588 | sizeof(struct dccp_hdr_ext) + |
589 | sizeof(struct dccp_hdr_ack_bits); | |
590 | struct sk_buff *skb; | |
591 | ||
118b2c95 ACM |
592 | skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
593 | GFP_ATOMIC); | |
3df80d93 ACM |
594 | if (skb == NULL) |
595 | return; | |
596 | ||
118b2c95 | 597 | skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
3df80d93 ACM |
598 | |
599 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
600 | dh = dccp_hdr(skb); | |
601 | memset(dh, 0, dccp_hdr_ack_len); | |
602 | ||
603 | /* Build DCCP header and checksum it. */ | |
604 | dh->dccph_type = DCCP_PKT_ACK; | |
605 | dh->dccph_sport = rxdh->dccph_dport; | |
606 | dh->dccph_dport = rxdh->dccph_sport; | |
607 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
608 | dh->dccph_x = 1; | |
45329e71 | 609 | |
3df80d93 ACM |
610 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); |
611 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
612 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
613 | ||
614 | memset(&fl, 0, sizeof(fl)); | |
615 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
616 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
617 | ||
618 | /* FIXME: calculate checksum, IPv4 also should... */ | |
619 | ||
620 | fl.proto = IPPROTO_DCCP; | |
621 | fl.oif = inet6_iif(rxskb); | |
622 | fl.fl_ip_dport = dh->dccph_dport; | |
623 | fl.fl_ip_sport = dh->dccph_sport; | |
624 | ||
625 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
626 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 627 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
628 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
629 | return; | |
630 | } | |
631 | } | |
632 | ||
633 | kfree_skb(skb); | |
634 | } | |
635 | ||
3df80d93 ACM |
636 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
637 | { | |
638 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
639 | const struct ipv6hdr *iph = skb->nh.ipv6h; | |
640 | struct sock *nsk; | |
641 | struct request_sock **prev; | |
642 | /* Find possible connection requests. */ | |
643 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
644 | dh->dccph_sport, | |
645 | &iph->saddr, | |
646 | &iph->daddr, | |
647 | inet6_iif(skb)); | |
648 | if (req != NULL) | |
649 | return dccp_check_req(sk, skb, req, prev); | |
650 | ||
651 | nsk = __inet6_lookup_established(&dccp_hashinfo, | |
652 | &iph->saddr, dh->dccph_sport, | |
653 | &iph->daddr, ntohs(dh->dccph_dport), | |
654 | inet6_iif(skb)); | |
3df80d93 ACM |
655 | if (nsk != NULL) { |
656 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
657 | bh_lock_sock(nsk); | |
658 | return nsk; | |
659 | } | |
660 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
661 | return NULL; | |
662 | } | |
663 | ||
664 | return sk; | |
665 | } | |
666 | ||
667 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
668 | { | |
669 | struct inet_request_sock *ireq; | |
670 | struct dccp_sock dp; | |
671 | struct request_sock *req; | |
672 | struct dccp_request_sock *dreq; | |
673 | struct inet6_request_sock *ireq6; | |
674 | struct ipv6_pinfo *np = inet6_sk(sk); | |
60fe62e7 | 675 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 ACM |
676 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
677 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
678 | ||
679 | if (skb->protocol == htons(ETH_P_IP)) | |
680 | return dccp_v4_conn_request(sk, skb); | |
681 | ||
682 | if (!ipv6_unicast_destination(skb)) | |
45329e71 | 683 | goto drop; |
3df80d93 ACM |
684 | |
685 | if (dccp_bad_service_code(sk, service)) { | |
686 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
687 | goto drop; | |
688 | } | |
689 | /* | |
45329e71 | 690 | * There are no SYN attacks on IPv6, yet... |
3df80d93 ACM |
691 | */ |
692 | if (inet_csk_reqsk_queue_is_full(sk)) | |
45329e71 | 693 | goto drop; |
3df80d93 ACM |
694 | |
695 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
696 | goto drop; | |
697 | ||
698 | req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot); | |
699 | if (req == NULL) | |
700 | goto drop; | |
701 | ||
702 | /* FIXME: process options */ | |
703 | ||
704 | dccp_openreq_init(req, &dp, skb); | |
705 | ||
706 | ireq6 = inet6_rsk(req); | |
707 | ireq = inet_rsk(req); | |
708 | ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr); | |
709 | ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr); | |
710 | req->rcv_wnd = 100; /* Fake, option parsing will get the | |
711 | right value */ | |
712 | ireq6->pktopts = NULL; | |
713 | ||
714 | if (ipv6_opt_accepted(sk, skb) || | |
715 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
716 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
717 | atomic_inc(&skb->users); | |
718 | ireq6->pktopts = skb; | |
719 | } | |
720 | ireq6->iif = sk->sk_bound_dev_if; | |
721 | ||
722 | /* So that link locals have meaning */ | |
723 | if (!sk->sk_bound_dev_if && | |
724 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
725 | ireq6->iif = inet6_iif(skb); | |
726 | ||
45329e71 | 727 | /* |
3df80d93 ACM |
728 | * Step 3: Process LISTEN state |
729 | * | |
730 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
731 | * | |
732 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
733 | * dccp_create_openreq_child. | |
734 | */ | |
735 | dreq = dccp_rsk(req); | |
736 | dreq->dreq_isr = dcb->dccpd_seq; | |
737 | dreq->dreq_iss = dccp_v6_init_sequence(sk, skb); | |
738 | dreq->dreq_service = service; | |
739 | ||
740 | if (dccp_v6_send_response(sk, req, NULL)) | |
741 | goto drop_and_free; | |
742 | ||
743 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
744 | return 0; | |
745 | ||
746 | drop_and_free: | |
747 | reqsk_free(req); | |
748 | drop: | |
749 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
750 | dcb->dccpd_reset_code = reset_code; | |
751 | return -1; | |
752 | } | |
753 | ||
754 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
755 | struct sk_buff *skb, | |
756 | struct request_sock *req, | |
757 | struct dst_entry *dst) | |
758 | { | |
759 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
760 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
761 | struct inet_sock *newinet; | |
762 | struct dccp_sock *newdp; | |
763 | struct dccp6_sock *newdp6; | |
764 | struct sock *newsk; | |
765 | struct ipv6_txoptions *opt; | |
766 | ||
767 | if (skb->protocol == htons(ETH_P_IP)) { | |
768 | /* | |
769 | * v6 mapped | |
770 | */ | |
3df80d93 | 771 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 772 | if (newsk == NULL) |
3df80d93 ACM |
773 | return NULL; |
774 | ||
775 | newdp6 = (struct dccp6_sock *)newsk; | |
776 | newdp = dccp_sk(newsk); | |
777 | newinet = inet_sk(newsk); | |
778 | newinet->pinet6 = &newdp6->inet6; | |
779 | newnp = inet6_sk(newsk); | |
780 | ||
781 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
782 | ||
783 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
784 | newinet->daddr); | |
785 | ||
786 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
787 | newinet->saddr); | |
788 | ||
789 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
790 | ||
791 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
792 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
793 | newnp->pktoptions = NULL; | |
794 | newnp->opt = NULL; | |
795 | newnp->mcast_oif = inet6_iif(skb); | |
796 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
797 | ||
798 | /* | |
799 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
800 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
801 | * that function for the gory details. -acme | |
802 | */ | |
803 | ||
804 | /* It is tricky place. Until this moment IPv4 tcp | |
805 | worked with IPv6 icsk.icsk_af_ops. | |
806 | Sync it now. | |
807 | */ | |
d83d8461 | 808 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
809 | |
810 | return newsk; | |
811 | } | |
812 | ||
813 | opt = np->opt; | |
814 | ||
815 | if (sk_acceptq_is_full(sk)) | |
816 | goto out_overflow; | |
817 | ||
45329e71 ACM |
818 | if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) { |
819 | const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts); | |
820 | ||
3df80d93 ACM |
821 | if (rxopt->srcrt) |
822 | opt = ipv6_invert_rthdr(sk, | |
823 | (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw + | |
824 | rxopt->srcrt)); | |
825 | } | |
826 | ||
827 | if (dst == NULL) { | |
828 | struct in6_addr *final_p = NULL, final; | |
829 | struct flowi fl; | |
830 | ||
831 | memset(&fl, 0, sizeof(fl)); | |
832 | fl.proto = IPPROTO_DCCP; | |
833 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
834 | if (opt != NULL && opt->srcrt != NULL) { |
835 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
836 | ||
3df80d93 ACM |
837 | ipv6_addr_copy(&final, &fl.fl6_dst); |
838 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
839 | final_p = &final; | |
840 | } | |
841 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
842 | fl.oif = sk->sk_bound_dev_if; | |
843 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
844 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
845 | ||
846 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
847 | goto out; | |
848 | ||
849 | if (final_p) | |
850 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
851 | ||
852 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
853 | goto out; | |
45329e71 | 854 | } |
3df80d93 ACM |
855 | |
856 | newsk = dccp_create_openreq_child(sk, req, skb); | |
857 | if (newsk == NULL) | |
858 | goto out; | |
859 | ||
860 | /* | |
861 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
862 | * count here, dccp_create_openreq_child now does this for us, see the | |
863 | * comment in that function for the gory details. -acme | |
864 | */ | |
865 | ||
866 | ip6_dst_store(newsk, dst, NULL); | |
45329e71 ACM |
867 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
868 | NETIF_F_TSO); | |
3df80d93 ACM |
869 | newdp6 = (struct dccp6_sock *)newsk; |
870 | newinet = inet_sk(newsk); | |
871 | newinet->pinet6 = &newdp6->inet6; | |
872 | newdp = dccp_sk(newsk); | |
873 | newnp = inet6_sk(newsk); | |
874 | ||
875 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
876 | ||
877 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
878 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
879 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
880 | newsk->sk_bound_dev_if = ireq6->iif; | |
881 | ||
45329e71 | 882 | /* Now IPv6 options... |
3df80d93 ACM |
883 | |
884 | First: no IPv4 options. | |
885 | */ | |
886 | newinet->opt = NULL; | |
887 | ||
888 | /* Clone RX bits */ | |
889 | newnp->rxopt.all = np->rxopt.all; | |
890 | ||
891 | /* Clone pktoptions received with SYN */ | |
892 | newnp->pktoptions = NULL; | |
893 | if (ireq6->pktopts != NULL) { | |
894 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
895 | kfree_skb(ireq6->pktopts); | |
896 | ireq6->pktopts = NULL; | |
897 | if (newnp->pktoptions) | |
898 | skb_set_owner_r(newnp->pktoptions, newsk); | |
899 | } | |
900 | newnp->opt = NULL; | |
901 | newnp->mcast_oif = inet6_iif(skb); | |
902 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
903 | ||
45329e71 ACM |
904 | /* |
905 | * Clone native IPv6 options from listening socket (if any) | |
906 | * | |
907 | * Yes, keeping reference count would be much more clever, but we make | |
908 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 909 | */ |
45329e71 | 910 | if (opt != NULL) { |
3df80d93 ACM |
911 | newnp->opt = ipv6_dup_options(newsk, opt); |
912 | if (opt != np->opt) | |
913 | sock_kfree_s(sk, opt, opt->tot_len); | |
914 | } | |
915 | ||
d83d8461 | 916 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 917 | if (newnp->opt != NULL) |
d83d8461 ACM |
918 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
919 | newnp->opt->opt_flen); | |
3df80d93 ACM |
920 | |
921 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
922 | ||
923 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
924 | ||
925 | __inet6_hash(&dccp_hashinfo, newsk); | |
926 | inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
927 | ||
928 | return newsk; | |
929 | ||
930 | out_overflow: | |
931 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
932 | out: | |
933 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
45329e71 | 934 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
935 | sock_kfree_s(sk, opt, opt->tot_len); |
936 | dst_release(dst); | |
937 | return NULL; | |
938 | } | |
939 | ||
940 | /* The socket must have it's spinlock held when we get | |
941 | * here. | |
942 | * | |
943 | * We have a potential double-lock case here, so even when | |
944 | * doing backlog processing we use the BH locking scheme. | |
945 | * This is because we cannot sleep with the original spinlock | |
946 | * held. | |
947 | */ | |
948 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
949 | { | |
950 | struct ipv6_pinfo *np = inet6_sk(sk); | |
951 | struct sk_buff *opt_skb = NULL; | |
952 | ||
953 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
954 | goes to IPv4 receive handler and backlogged. | |
955 | From backlog it always goes here. Kerboom... | |
956 | Fortunately, dccp_rcv_established and rcv_established | |
957 | handle them correctly, but it is not case with | |
958 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
959 | */ | |
960 | ||
961 | if (skb->protocol == htons(ETH_P_IP)) | |
962 | return dccp_v4_do_rcv(sk, skb); | |
963 | ||
964 | if (sk_filter(sk, skb, 0)) | |
965 | goto discard; | |
966 | ||
967 | /* | |
45329e71 ACM |
968 | * socket locking is here for SMP purposes as backlog rcv is currently |
969 | * called with bh processing disabled. | |
3df80d93 ACM |
970 | */ |
971 | ||
972 | /* Do Stevens' IPV6_PKTOPTIONS. | |
973 | ||
974 | Yes, guys, it is the only place in our code, where we | |
975 | may make it not affecting IPv4. | |
976 | The rest of code is protocol independent, | |
977 | and I do not like idea to uglify IPv4. | |
978 | ||
979 | Actually, all the idea behind IPV6_PKTOPTIONS | |
980 | looks not very well thought. For now we latch | |
981 | options, received in the last packet, enqueued | |
982 | by tcp. Feel free to propose better solution. | |
983 | --ANK (980728) | |
984 | */ | |
985 | if (np->rxopt.all) | |
986 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
987 | ||
988 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
989 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
990 | goto reset; | |
991 | return 0; | |
992 | } | |
993 | ||
45329e71 | 994 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 995 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 996 | |
45329e71 ACM |
997 | if (nsk == NULL) |
998 | goto discard; | |
3df80d93 ACM |
999 | /* |
1000 | * Queue it on the new socket if the new socket is active, | |
1001 | * otherwise we just shortcircuit this and continue with | |
1002 | * the new socket.. | |
1003 | */ | |
45329e71 | 1004 | if (nsk != sk) { |
3df80d93 ACM |
1005 | if (dccp_child_process(sk, nsk, skb)) |
1006 | goto reset; | |
45329e71 | 1007 | if (opt_skb != NULL) |
3df80d93 ACM |
1008 | __kfree_skb(opt_skb); |
1009 | return 0; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
1014 | goto reset; | |
1015 | return 0; | |
1016 | ||
1017 | reset: | |
1018 | dccp_v6_ctl_send_reset(skb); | |
1019 | discard: | |
45329e71 | 1020 | if (opt_skb != NULL) |
3df80d93 ACM |
1021 | __kfree_skb(opt_skb); |
1022 | kfree_skb(skb); | |
1023 | return 0; | |
1024 | } | |
1025 | ||
951dbc8a | 1026 | static int dccp_v6_rcv(struct sk_buff **pskb) |
3df80d93 ACM |
1027 | { |
1028 | const struct dccp_hdr *dh; | |
1029 | struct sk_buff *skb = *pskb; | |
1030 | struct sock *sk; | |
3df80d93 ACM |
1031 | |
1032 | /* Step 1: Check header basics: */ | |
1033 | ||
1034 | if (dccp_invalid_packet(skb)) | |
1035 | goto discard_it; | |
1036 | ||
1037 | dh = dccp_hdr(skb); | |
1038 | ||
1039 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); | |
1040 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
1041 | ||
1042 | if (dccp_packet_without_ack(skb)) | |
1043 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
1044 | else | |
1045 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
1046 | ||
1047 | /* Step 2: | |
1048 | * Look up flow ID in table and get corresponding socket */ | |
1049 | sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr, | |
1050 | dh->dccph_sport, | |
1051 | &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport), | |
1052 | inet6_iif(skb)); | |
45329e71 | 1053 | /* |
3df80d93 ACM |
1054 | * Step 2: |
1055 | * If no socket ... | |
1056 | * Generate Reset(No Connection) unless P.type == Reset | |
1057 | * Drop packet and return | |
1058 | */ | |
1059 | if (sk == NULL) | |
1060 | goto no_dccp_socket; | |
1061 | ||
45329e71 | 1062 | /* |
3df80d93 ACM |
1063 | * Step 2: |
1064 | * ... or S.state == TIMEWAIT, | |
1065 | * Generate Reset(No Connection) unless P.type == Reset | |
1066 | * Drop packet and return | |
1067 | */ | |
3df80d93 | 1068 | if (sk->sk_state == DCCP_TIME_WAIT) |
45329e71 | 1069 | goto do_time_wait; |
3df80d93 ACM |
1070 | |
1071 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1072 | goto discard_and_relse; | |
1073 | ||
25995ff5 | 1074 | return sk_receive_skb(sk, skb) ? -1 : 0; |
3df80d93 ACM |
1075 | |
1076 | no_dccp_socket: | |
1077 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1078 | goto discard_it; | |
1079 | /* | |
1080 | * Step 2: | |
1081 | * Generate Reset(No Connection) unless P.type == Reset | |
1082 | * Drop packet and return | |
1083 | */ | |
1084 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
1085 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
1086 | DCCP_RESET_CODE_NO_CONNECTION; | |
1087 | dccp_v6_ctl_send_reset(skb); | |
1088 | } | |
1089 | discard_it: | |
1090 | ||
1091 | /* | |
1092 | * Discard frame | |
1093 | */ | |
1094 | ||
1095 | kfree_skb(skb); | |
1096 | return 0; | |
1097 | ||
1098 | discard_and_relse: | |
1099 | sock_put(sk); | |
1100 | goto discard_it; | |
1101 | ||
1102 | do_time_wait: | |
1103 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
1104 | goto no_dccp_socket; | |
1105 | } | |
1106 | ||
1107 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { | |
543d9cfe ACM |
1108 | .queue_xmit = inet6_csk_xmit, |
1109 | .send_check = dccp_v6_send_check, | |
1110 | .rebuild_header = inet6_sk_rebuild_header, | |
1111 | .conn_request = dccp_v6_conn_request, | |
1112 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1113 | .net_header_len = sizeof(struct ipv6hdr), | |
1114 | .setsockopt = ipv6_setsockopt, | |
1115 | .getsockopt = ipv6_getsockopt, | |
1116 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1117 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1118 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1119 | .compat_setsockopt = compat_ipv6_setsockopt, |
1120 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1121 | #endif |
3df80d93 ACM |
1122 | }; |
1123 | ||
1124 | /* | |
1125 | * DCCP over IPv4 via INET6 API | |
1126 | */ | |
1127 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1128 | .queue_xmit = ip_queue_xmit, |
1129 | .send_check = dccp_v4_send_check, | |
1130 | .rebuild_header = inet_sk_rebuild_header, | |
1131 | .conn_request = dccp_v6_conn_request, | |
1132 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1133 | .net_header_len = sizeof(struct iphdr), | |
1134 | .setsockopt = ipv6_setsockopt, | |
1135 | .getsockopt = ipv6_getsockopt, | |
1136 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1137 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1138 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1139 | .compat_setsockopt = compat_ipv6_setsockopt, |
1140 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1141 | #endif |
3df80d93 ACM |
1142 | }; |
1143 | ||
1144 | /* NOTE: A lot of things set to zero explicitly by call to | |
1145 | * sk_alloc() so need not be done here. | |
1146 | */ | |
1147 | static int dccp_v6_init_sock(struct sock *sk) | |
1148 | { | |
72478873 ACM |
1149 | static __u8 dccp_v6_ctl_sock_initialized; |
1150 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1151 | |
72478873 ACM |
1152 | if (err == 0) { |
1153 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1154 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1155 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1156 | } |
3df80d93 ACM |
1157 | |
1158 | return err; | |
1159 | } | |
1160 | ||
1161 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1162 | { | |
3e0fadc5 | 1163 | dccp_destroy_sock(sk); |
3df80d93 ACM |
1164 | return inet6_destroy_sock(sk); |
1165 | } | |
1166 | ||
1167 | static struct proto dccp_v6_prot = { | |
543d9cfe ACM |
1168 | .name = "DCCPv6", |
1169 | .owner = THIS_MODULE, | |
1170 | .close = dccp_close, | |
1171 | .connect = dccp_v6_connect, | |
1172 | .disconnect = dccp_disconnect, | |
1173 | .ioctl = dccp_ioctl, | |
1174 | .init = dccp_v6_init_sock, | |
1175 | .setsockopt = dccp_setsockopt, | |
1176 | .getsockopt = dccp_getsockopt, | |
1177 | .sendmsg = dccp_sendmsg, | |
1178 | .recvmsg = dccp_recvmsg, | |
1179 | .backlog_rcv = dccp_v6_do_rcv, | |
1180 | .hash = dccp_v6_hash, | |
1181 | .unhash = dccp_unhash, | |
1182 | .accept = inet_csk_accept, | |
1183 | .get_port = dccp_v6_get_port, | |
1184 | .shutdown = dccp_shutdown, | |
1185 | .destroy = dccp_v6_destroy_sock, | |
1186 | .orphan_count = &dccp_orphan_count, | |
1187 | .max_header = MAX_DCCP_HEADER, | |
1188 | .obj_size = sizeof(struct dccp6_sock), | |
1189 | .rsk_prot = &dccp6_request_sock_ops, | |
1190 | .twsk_prot = &dccp6_timewait_sock_ops, | |
3fdadf7d | 1191 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1192 | .compat_setsockopt = compat_dccp_setsockopt, |
1193 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1194 | #endif |
3df80d93 ACM |
1195 | }; |
1196 | ||
1197 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1198 | .handler = dccp_v6_rcv, |
1199 | .err_handler = dccp_v6_err, | |
1200 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1201 | }; |
1202 | ||
1203 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1204 | .family = PF_INET6, |
1205 | .owner = THIS_MODULE, | |
1206 | .release = inet6_release, | |
1207 | .bind = inet6_bind, | |
1208 | .connect = inet_stream_connect, | |
1209 | .socketpair = sock_no_socketpair, | |
1210 | .accept = inet_accept, | |
1211 | .getname = inet6_getname, | |
1212 | .poll = dccp_poll, | |
1213 | .ioctl = inet6_ioctl, | |
1214 | .listen = inet_dccp_listen, | |
1215 | .shutdown = inet_shutdown, | |
1216 | .setsockopt = sock_common_setsockopt, | |
1217 | .getsockopt = sock_common_getsockopt, | |
1218 | .sendmsg = inet_sendmsg, | |
1219 | .recvmsg = sock_common_recvmsg, | |
1220 | .mmap = sock_no_mmap, | |
1221 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1222 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1223 | .compat_setsockopt = compat_sock_common_setsockopt, |
1224 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1225 | #endif |
3df80d93 ACM |
1226 | }; |
1227 | ||
1228 | static struct inet_protosw dccp_v6_protosw = { | |
1229 | .type = SOCK_DCCP, | |
1230 | .protocol = IPPROTO_DCCP, | |
1231 | .prot = &dccp_v6_prot, | |
1232 | .ops = &inet6_dccp_ops, | |
1233 | .capability = -1, | |
d83d8461 | 1234 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1235 | }; |
1236 | ||
1237 | static int __init dccp_v6_init(void) | |
1238 | { | |
1239 | int err = proto_register(&dccp_v6_prot, 1); | |
1240 | ||
1241 | if (err != 0) | |
1242 | goto out; | |
1243 | ||
1244 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1245 | if (err != 0) | |
1246 | goto out_unregister_proto; | |
1247 | ||
1248 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1249 | |
c4d93909 ACM |
1250 | err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
1251 | SOCK_DCCP, IPPROTO_DCCP); | |
1252 | if (err != 0) | |
72478873 | 1253 | goto out_unregister_protosw; |
3df80d93 ACM |
1254 | out: |
1255 | return err; | |
72478873 ACM |
1256 | out_unregister_protosw: |
1257 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1258 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1259 | out_unregister_proto: |
1260 | proto_unregister(&dccp_v6_prot); | |
1261 | goto out; | |
1262 | } | |
1263 | ||
1264 | static void __exit dccp_v6_exit(void) | |
1265 | { | |
1266 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1267 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1268 | proto_unregister(&dccp_v6_prot); | |
1269 | } | |
1270 | ||
1271 | module_init(dccp_v6_init); | |
1272 | module_exit(dccp_v6_exit); | |
1273 | ||
1274 | /* | |
1275 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1276 | * values directly, Also cover the case where the protocol is not specified, | |
1277 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1278 | */ | |
1279 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); | |
1280 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); | |
1281 | MODULE_LICENSE("GPL"); | |
1282 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1283 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |