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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> | |
14c85021 | 23 | #include <net/inet_sock.h> |
3df80d93 ACM |
24 | #include <net/inet6_connection_sock.h> |
25 | #include <net/inet6_hashtables.h> | |
26 | #include <net/ip6_route.h> | |
27 | #include <net/ipv6.h> | |
28 | #include <net/protocol.h> | |
29 | #include <net/transp_v6.h> | |
aa0e4e4a | 30 | #include <net/ip6_checksum.h> |
3df80d93 ACM |
31 | #include <net/xfrm.h> |
32 | ||
33 | #include "dccp.h" | |
34 | #include "ipv6.h" | |
35 | ||
72478873 ACM |
36 | /* Socket used for sending RSTs and ACKs */ |
37 | static struct socket *dccp_v6_ctl_socket; | |
38 | ||
3df80d93 ACM |
39 | static void dccp_v6_ctl_send_reset(struct sk_buff *skb); |
40 | static void dccp_v6_reqsk_send_ack(struct sk_buff *skb, | |
41 | struct request_sock *req); | |
42 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
43 | ||
44 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
45 | ||
46 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; | |
47 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
48 | ||
49 | static int dccp_v6_get_port(struct sock *sk, unsigned short snum) | |
50 | { | |
51 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, | |
52 | inet6_csk_bind_conflict); | |
53 | } | |
54 | ||
55 | static void dccp_v6_hash(struct sock *sk) | |
56 | { | |
57 | if (sk->sk_state != DCCP_CLOSED) { | |
58 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
c985ed70 | 59 | dccp_hash(sk); |
3df80d93 ACM |
60 | return; |
61 | } | |
62 | local_bh_disable(); | |
63 | __inet6_hash(&dccp_hashinfo, sk); | |
64 | local_bh_enable(); | |
65 | } | |
66 | } | |
67 | ||
68 | static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len, | |
69 | struct in6_addr *saddr, | |
70 | struct in6_addr *daddr, | |
71 | unsigned long base) | |
72 | { | |
73 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base); | |
74 | } | |
75 | ||
76 | static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) | |
77 | { | |
78 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
79 | ||
80 | if (skb->protocol == htons(ETH_P_IPV6)) | |
81 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
82 | skb->nh.ipv6h->saddr.s6_addr32, | |
83 | dh->dccph_dport, | |
84 | dh->dccph_sport); | |
85 | else | |
86 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
87 | skb->nh.iph->saddr, | |
88 | dh->dccph_dport, | |
89 | dh->dccph_sport); | |
90 | } | |
91 | ||
3df80d93 ACM |
92 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
93 | int addr_len) | |
94 | { | |
95 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
d83d8461 | 96 | struct inet_connection_sock *icsk = inet_csk(sk); |
3df80d93 ACM |
97 | struct inet_sock *inet = inet_sk(sk); |
98 | struct ipv6_pinfo *np = inet6_sk(sk); | |
99 | struct dccp_sock *dp = dccp_sk(sk); | |
100 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
101 | struct flowi fl; | |
102 | struct dst_entry *dst; | |
103 | int addr_type; | |
104 | int err; | |
105 | ||
106 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
107 | ||
108 | if (addr_len < SIN6_LEN_RFC2133) | |
109 | return -EINVAL; | |
110 | ||
111 | if (usin->sin6_family != AF_INET6) | |
112 | return -EAFNOSUPPORT; | |
113 | ||
114 | memset(&fl, 0, sizeof(fl)); | |
115 | ||
116 | if (np->sndflow) { | |
117 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
118 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
119 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
120 | struct ip6_flowlabel *flowlabel; | |
121 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
122 | if (flowlabel == NULL) | |
123 | return -EINVAL; | |
124 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
125 | fl6_sock_release(flowlabel); | |
126 | } | |
127 | } | |
128 | ||
129 | /* | |
130 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
131 | */ | |
132 | ||
133 | if (ipv6_addr_any(&usin->sin6_addr)) | |
134 | usin->sin6_addr.s6_addr[15] = 0x1; | |
135 | ||
136 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
137 | ||
138 | if(addr_type & IPV6_ADDR_MULTICAST) | |
139 | return -ENETUNREACH; | |
140 | ||
141 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
142 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
143 | usin->sin6_scope_id) { | |
144 | /* If interface is set while binding, indices | |
145 | * must coincide. | |
146 | */ | |
147 | if (sk->sk_bound_dev_if && | |
148 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
149 | return -EINVAL; | |
150 | ||
151 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
152 | } | |
153 | ||
154 | /* Connect to link-local address requires an interface */ | |
155 | if (!sk->sk_bound_dev_if) | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
160 | np->flow_label = fl.fl6_flowlabel; | |
161 | ||
162 | /* | |
163 | * DCCP over IPv4 | |
164 | */ | |
165 | ||
166 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 167 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
3df80d93 ACM |
168 | struct sockaddr_in sin; |
169 | ||
170 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
171 | ||
172 | if (__ipv6_only_sock(sk)) | |
173 | return -ENETUNREACH; | |
174 | ||
175 | sin.sin_family = AF_INET; | |
176 | sin.sin_port = usin->sin6_port; | |
177 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
178 | ||
d83d8461 | 179 | icsk->icsk_af_ops = &dccp_ipv6_mapped; |
3df80d93 ACM |
180 | sk->sk_backlog_rcv = dccp_v4_do_rcv; |
181 | ||
182 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
183 | ||
184 | if (err) { | |
d83d8461 ACM |
185 | icsk->icsk_ext_hdr_len = exthdrlen; |
186 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
3df80d93 ACM |
187 | sk->sk_backlog_rcv = dccp_v6_do_rcv; |
188 | goto failure; | |
189 | } else { | |
190 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
191 | inet->saddr); | |
192 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
193 | inet->rcv_saddr); | |
194 | } | |
195 | ||
196 | return err; | |
197 | } | |
198 | ||
199 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
200 | saddr = &np->rcv_saddr; | |
201 | ||
202 | fl.proto = IPPROTO_DCCP; | |
203 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
204 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
205 | fl.oif = sk->sk_bound_dev_if; | |
206 | fl.fl_ip_dport = usin->sin6_port; | |
207 | fl.fl_ip_sport = inet->sport; | |
208 | ||
209 | if (np->opt && np->opt->srcrt) { | |
210 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
211 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
212 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
213 | final_p = &final; | |
214 | } | |
215 | ||
216 | err = ip6_dst_lookup(sk, &dst, &fl); | |
217 | if (err) | |
218 | goto failure; | |
219 | if (final_p) | |
220 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
221 | ||
222 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
223 | goto failure; | |
224 | ||
225 | if (saddr == NULL) { | |
226 | saddr = &fl.fl6_src; | |
227 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
228 | } | |
229 | ||
230 | /* set the source address */ | |
231 | ipv6_addr_copy(&np->saddr, saddr); | |
232 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
233 | ||
234 | ip6_dst_store(sk, dst, NULL); | |
235 | ||
d83d8461 | 236 | icsk->icsk_ext_hdr_len = 0; |
3df80d93 | 237 | if (np->opt) |
d83d8461 ACM |
238 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
239 | np->opt->opt_nflen); | |
3df80d93 ACM |
240 | |
241 | inet->dport = usin->sin6_port; | |
242 | ||
243 | dccp_set_state(sk, DCCP_REQUESTING); | |
d8313f5c | 244 | err = inet6_hash_connect(&dccp_death_row, sk); |
3df80d93 ACM |
245 | if (err) |
246 | goto late_failure; | |
247 | /* FIXME */ | |
248 | #if 0 | |
249 | dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32, | |
250 | np->daddr.s6_addr32, | |
251 | inet->sport, | |
252 | inet->dport); | |
253 | #endif | |
254 | err = dccp_connect(sk); | |
255 | if (err) | |
256 | goto late_failure; | |
257 | ||
258 | return 0; | |
259 | ||
260 | late_failure: | |
261 | dccp_set_state(sk, DCCP_CLOSED); | |
262 | __sk_dst_reset(sk); | |
263 | failure: | |
264 | inet->dport = 0; | |
265 | sk->sk_route_caps = 0; | |
266 | return err; | |
267 | } | |
268 | ||
269 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
60fe62e7 | 270 | int type, int code, int offset, __be32 info) |
3df80d93 ACM |
271 | { |
272 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; | |
273 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
274 | struct ipv6_pinfo *np; | |
275 | struct sock *sk; | |
276 | int err; | |
277 | __u64 seq; | |
278 | ||
279 | sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, | |
280 | &hdr->saddr, dh->dccph_sport, skb->dev->ifindex); | |
281 | ||
282 | if (sk == NULL) { | |
283 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
284 | return; | |
285 | } | |
286 | ||
287 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
288 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
289 | return; | |
290 | } | |
291 | ||
292 | bh_lock_sock(sk); | |
293 | if (sock_owned_by_user(sk)) | |
294 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
295 | ||
296 | if (sk->sk_state == DCCP_CLOSED) | |
297 | goto out; | |
298 | ||
299 | np = inet6_sk(sk); | |
300 | ||
301 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
302 | struct dst_entry *dst = NULL; |
303 | ||
304 | if (sock_owned_by_user(sk)) | |
305 | goto out; | |
306 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
307 | goto out; | |
308 | ||
309 | /* icmp should have updated the destination cache entry */ | |
310 | dst = __sk_dst_check(sk, np->dst_cookie); | |
311 | ||
312 | if (dst == NULL) { | |
313 | struct inet_sock *inet = inet_sk(sk); | |
314 | struct flowi fl; | |
315 | ||
316 | /* BUGGG_FUTURE: Again, it is not clear how | |
317 | to handle rthdr case. Ignore this complexity | |
318 | for now. | |
319 | */ | |
320 | memset(&fl, 0, sizeof(fl)); | |
321 | fl.proto = IPPROTO_DCCP; | |
322 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
323 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
324 | fl.oif = sk->sk_bound_dev_if; | |
325 | fl.fl_ip_dport = inet->dport; | |
326 | fl.fl_ip_sport = inet->sport; | |
327 | ||
328 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { | |
329 | sk->sk_err_soft = -err; | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { | |
334 | sk->sk_err_soft = -err; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | } else | |
339 | dst_hold(dst); | |
340 | ||
d83d8461 | 341 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
342 | dccp_sync_mss(sk, dst_mtu(dst)); |
343 | } /* else let the usual retransmit timer handle it */ | |
344 | dst_release(dst); | |
345 | goto out; | |
346 | } | |
347 | ||
348 | icmpv6_err_convert(type, code, &err); | |
349 | ||
350 | seq = DCCP_SKB_CB(skb)->dccpd_seq; | |
351 | /* Might be for an request_sock */ | |
352 | switch (sk->sk_state) { | |
353 | struct request_sock *req, **prev; | |
354 | case DCCP_LISTEN: | |
355 | if (sock_owned_by_user(sk)) | |
356 | goto out; | |
357 | ||
358 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
359 | &hdr->daddr, &hdr->saddr, | |
360 | inet6_iif(skb)); | |
361 | if (!req) | |
362 | goto out; | |
363 | ||
364 | /* ICMPs are not backlogged, hence we cannot get | |
365 | * an established socket here. | |
366 | */ | |
367 | BUG_TRAP(req->sk == NULL); | |
368 | ||
369 | if (seq != dccp_rsk(req)->dreq_iss) { | |
370 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
371 | goto out; | |
372 | } | |
373 | ||
374 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
375 | goto out; | |
376 | ||
377 | case DCCP_REQUESTING: | |
378 | case DCCP_RESPOND: /* Cannot happen. | |
379 | It can, it SYNs are crossed. --ANK */ | |
380 | if (!sock_owned_by_user(sk)) { | |
381 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
382 | sk->sk_err = err; | |
383 | /* | |
384 | * Wake people up to see the error | |
385 | * (see connect in sock.c) | |
386 | */ | |
387 | sk->sk_error_report(sk); | |
388 | ||
389 | dccp_done(sk); | |
390 | } else | |
391 | sk->sk_err_soft = err; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | if (!sock_owned_by_user(sk) && np->recverr) { | |
396 | sk->sk_err = err; | |
397 | sk->sk_error_report(sk); | |
398 | } else | |
399 | sk->sk_err_soft = err; | |
400 | ||
401 | out: | |
402 | bh_unlock_sock(sk); | |
403 | sock_put(sk); | |
404 | } | |
405 | ||
406 | ||
407 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, | |
408 | struct dst_entry *dst) | |
409 | { | |
410 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
411 | struct ipv6_pinfo *np = inet6_sk(sk); | |
412 | struct sk_buff *skb; | |
413 | struct ipv6_txoptions *opt = NULL; | |
414 | struct in6_addr *final_p = NULL, final; | |
415 | struct flowi fl; | |
416 | int err = -1; | |
417 | ||
418 | memset(&fl, 0, sizeof(fl)); | |
419 | fl.proto = IPPROTO_DCCP; | |
420 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
421 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
422 | fl.fl6_flowlabel = 0; | |
423 | fl.oif = ireq6->iif; | |
424 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
425 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
426 | ||
427 | if (dst == NULL) { | |
428 | opt = np->opt; | |
429 | if (opt == NULL && | |
430 | np->rxopt.bits.osrcrt == 2 && | |
431 | ireq6->pktopts) { | |
432 | struct sk_buff *pktopts = ireq6->pktopts; | |
433 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); | |
434 | if (rxopt->srcrt) | |
435 | opt = ipv6_invert_rthdr(sk, | |
436 | (struct ipv6_rt_hdr *)(pktopts->nh.raw + | |
437 | rxopt->srcrt)); | |
438 | } | |
439 | ||
440 | if (opt && opt->srcrt) { | |
441 | struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
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; | |
450 | if (final_p) | |
451 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
452 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
453 | goto done; | |
454 | } | |
455 | ||
456 | skb = dccp_make_response(sk, dst, req); | |
457 | if (skb != NULL) { | |
458 | struct dccp_hdr *dh = dccp_hdr(skb); | |
459 | dh->dccph_checksum = dccp_v6_check(dh, skb->len, | |
460 | &ireq6->loc_addr, | |
461 | &ireq6->rmt_addr, | |
462 | csum_partial((char *)dh, | |
463 | skb->len, | |
464 | skb->csum)); | |
465 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
466 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
467 | if (err == NET_XMIT_CN) | |
468 | err = 0; | |
469 | } | |
470 | ||
471 | done: | |
472 | if (opt && opt != np->opt) | |
473 | sock_kfree_s(sk, opt, opt->tot_len); | |
0cbd7825 | 474 | dst_release(dst); |
3df80d93 ACM |
475 | return err; |
476 | } | |
477 | ||
478 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
479 | { | |
480 | if (inet6_rsk(req)->pktopts != NULL) | |
481 | kfree_skb(inet6_rsk(req)->pktopts); | |
482 | } | |
483 | ||
484 | static struct request_sock_ops dccp6_request_sock_ops = { | |
485 | .family = AF_INET6, | |
486 | .obj_size = sizeof(struct dccp6_request_sock), | |
487 | .rtx_syn_ack = dccp_v6_send_response, | |
488 | .send_ack = dccp_v6_reqsk_send_ack, | |
489 | .destructor = dccp_v6_reqsk_destructor, | |
490 | .send_reset = dccp_v6_ctl_send_reset, | |
491 | }; | |
492 | ||
6d6ee43e ACM |
493 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
494 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
495 | }; | |
496 | ||
3df80d93 ACM |
497 | static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
498 | { | |
499 | struct ipv6_pinfo *np = inet6_sk(sk); | |
500 | struct dccp_hdr *dh = dccp_hdr(skb); | |
501 | ||
502 | dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr, | |
503 | len, IPPROTO_DCCP, | |
504 | csum_partial((char *)dh, | |
505 | dh->dccph_doff << 2, | |
506 | skb->csum)); | |
507 | } | |
508 | ||
509 | static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb) | |
510 | { | |
511 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
512 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
513 | sizeof(struct dccp_hdr_ext) + | |
514 | sizeof(struct dccp_hdr_reset); | |
515 | struct sk_buff *skb; | |
516 | struct flowi fl; | |
517 | u64 seqno; | |
518 | ||
519 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
520 | return; | |
521 | ||
522 | if (!ipv6_unicast_destination(rxskb)) | |
523 | return; | |
524 | ||
525 | /* | |
526 | * We need to grab some memory, and put together an RST, | |
527 | * and then put it into the queue to be sent. | |
528 | */ | |
529 | ||
530 | skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + | |
531 | dccp_hdr_reset_len, GFP_ATOMIC); | |
532 | if (skb == NULL) | |
533 | return; | |
534 | ||
535 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) + | |
536 | dccp_hdr_reset_len); | |
537 | ||
538 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
539 | dh = dccp_hdr(skb); | |
540 | memset(dh, 0, dccp_hdr_reset_len); | |
541 | ||
542 | /* Swap the send and the receive. */ | |
543 | dh->dccph_type = DCCP_PKT_RESET; | |
544 | dh->dccph_sport = rxdh->dccph_dport; | |
545 | dh->dccph_dport = rxdh->dccph_sport; | |
546 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
547 | dh->dccph_x = 1; | |
548 | dccp_hdr_reset(skb)->dccph_reset_code = | |
549 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
550 | ||
551 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ | |
552 | seqno = 0; | |
553 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
554 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
555 | ||
556 | dccp_hdr_set_seq(dh, seqno); | |
557 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
558 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
559 | ||
560 | memset(&fl, 0, sizeof(fl)); | |
561 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
562 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
563 | dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, | |
564 | sizeof(*dh), IPPROTO_DCCP, | |
565 | skb->csum); | |
566 | fl.proto = IPPROTO_DCCP; | |
567 | fl.oif = inet6_iif(rxskb); | |
568 | fl.fl_ip_dport = dh->dccph_dport; | |
569 | fl.fl_ip_sport = dh->dccph_sport; | |
570 | ||
571 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
572 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
573 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 574 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
575 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
576 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
577 | return; | |
578 | } | |
579 | } | |
580 | ||
581 | kfree_skb(skb); | |
582 | } | |
583 | ||
584 | static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb) | |
585 | { | |
586 | struct flowi fl; | |
587 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
588 | const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) + | |
589 | sizeof(struct dccp_hdr_ext) + | |
590 | sizeof(struct dccp_hdr_ack_bits); | |
591 | struct sk_buff *skb; | |
592 | ||
593 | skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + | |
594 | dccp_hdr_ack_len, GFP_ATOMIC); | |
595 | if (skb == NULL) | |
596 | return; | |
597 | ||
598 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) + | |
599 | dccp_hdr_ack_len); | |
600 | ||
601 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
602 | dh = dccp_hdr(skb); | |
603 | memset(dh, 0, dccp_hdr_ack_len); | |
604 | ||
605 | /* Build DCCP header and checksum it. */ | |
606 | dh->dccph_type = DCCP_PKT_ACK; | |
607 | dh->dccph_sport = rxdh->dccph_dport; | |
608 | dh->dccph_dport = rxdh->dccph_sport; | |
609 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
610 | dh->dccph_x = 1; | |
611 | ||
612 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); | |
613 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), | |
614 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
615 | ||
616 | memset(&fl, 0, sizeof(fl)); | |
617 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
618 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
619 | ||
620 | /* FIXME: calculate checksum, IPv4 also should... */ | |
621 | ||
622 | fl.proto = IPPROTO_DCCP; | |
623 | fl.oif = inet6_iif(rxskb); | |
624 | fl.fl_ip_dport = dh->dccph_dport; | |
625 | fl.fl_ip_sport = dh->dccph_sport; | |
626 | ||
627 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
628 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 629 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
630 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
631 | return; | |
632 | } | |
633 | } | |
634 | ||
635 | kfree_skb(skb); | |
636 | } | |
637 | ||
638 | static void dccp_v6_reqsk_send_ack(struct sk_buff *skb, | |
639 | struct request_sock *req) | |
640 | { | |
641 | dccp_v6_ctl_send_ack(skb); | |
642 | } | |
643 | ||
644 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
645 | { | |
646 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
647 | const struct ipv6hdr *iph = skb->nh.ipv6h; | |
648 | struct sock *nsk; | |
649 | struct request_sock **prev; | |
650 | /* Find possible connection requests. */ | |
651 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
652 | dh->dccph_sport, | |
653 | &iph->saddr, | |
654 | &iph->daddr, | |
655 | inet6_iif(skb)); | |
656 | if (req != NULL) | |
657 | return dccp_check_req(sk, skb, req, prev); | |
658 | ||
659 | nsk = __inet6_lookup_established(&dccp_hashinfo, | |
660 | &iph->saddr, dh->dccph_sport, | |
661 | &iph->daddr, ntohs(dh->dccph_dport), | |
662 | inet6_iif(skb)); | |
663 | ||
664 | if (nsk != NULL) { | |
665 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
666 | bh_lock_sock(nsk); | |
667 | return nsk; | |
668 | } | |
669 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
670 | return NULL; | |
671 | } | |
672 | ||
673 | return sk; | |
674 | } | |
675 | ||
676 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
677 | { | |
678 | struct inet_request_sock *ireq; | |
679 | struct dccp_sock dp; | |
680 | struct request_sock *req; | |
681 | struct dccp_request_sock *dreq; | |
682 | struct inet6_request_sock *ireq6; | |
683 | struct ipv6_pinfo *np = inet6_sk(sk); | |
60fe62e7 | 684 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 ACM |
685 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
686 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
687 | ||
688 | if (skb->protocol == htons(ETH_P_IP)) | |
689 | return dccp_v4_conn_request(sk, skb); | |
690 | ||
691 | if (!ipv6_unicast_destination(skb)) | |
692 | goto drop; | |
693 | ||
694 | if (dccp_bad_service_code(sk, service)) { | |
695 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
696 | goto drop; | |
697 | } | |
698 | /* | |
699 | * There are no SYN attacks on IPv6, yet... | |
700 | */ | |
701 | if (inet_csk_reqsk_queue_is_full(sk)) | |
702 | goto drop; | |
703 | ||
704 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
705 | goto drop; | |
706 | ||
707 | req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot); | |
708 | if (req == NULL) | |
709 | goto drop; | |
710 | ||
711 | /* FIXME: process options */ | |
712 | ||
713 | dccp_openreq_init(req, &dp, skb); | |
714 | ||
715 | ireq6 = inet6_rsk(req); | |
716 | ireq = inet_rsk(req); | |
717 | ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr); | |
718 | ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr); | |
719 | req->rcv_wnd = 100; /* Fake, option parsing will get the | |
720 | right value */ | |
721 | ireq6->pktopts = NULL; | |
722 | ||
723 | if (ipv6_opt_accepted(sk, skb) || | |
724 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
725 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
726 | atomic_inc(&skb->users); | |
727 | ireq6->pktopts = skb; | |
728 | } | |
729 | ireq6->iif = sk->sk_bound_dev_if; | |
730 | ||
731 | /* So that link locals have meaning */ | |
732 | if (!sk->sk_bound_dev_if && | |
733 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
734 | ireq6->iif = inet6_iif(skb); | |
735 | ||
736 | /* | |
737 | * Step 3: Process LISTEN state | |
738 | * | |
739 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
740 | * | |
741 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
742 | * dccp_create_openreq_child. | |
743 | */ | |
744 | dreq = dccp_rsk(req); | |
745 | dreq->dreq_isr = dcb->dccpd_seq; | |
746 | dreq->dreq_iss = dccp_v6_init_sequence(sk, skb); | |
747 | dreq->dreq_service = service; | |
748 | ||
749 | if (dccp_v6_send_response(sk, req, NULL)) | |
750 | goto drop_and_free; | |
751 | ||
752 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
753 | return 0; | |
754 | ||
755 | drop_and_free: | |
756 | reqsk_free(req); | |
757 | drop: | |
758 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
759 | dcb->dccpd_reset_code = reset_code; | |
760 | return -1; | |
761 | } | |
762 | ||
763 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
764 | struct sk_buff *skb, | |
765 | struct request_sock *req, | |
766 | struct dst_entry *dst) | |
767 | { | |
768 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
769 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
770 | struct inet_sock *newinet; | |
771 | struct dccp_sock *newdp; | |
772 | struct dccp6_sock *newdp6; | |
773 | struct sock *newsk; | |
774 | struct ipv6_txoptions *opt; | |
775 | ||
776 | if (skb->protocol == htons(ETH_P_IP)) { | |
777 | /* | |
778 | * v6 mapped | |
779 | */ | |
780 | ||
781 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); | |
782 | if (newsk == NULL) | |
783 | return NULL; | |
784 | ||
785 | newdp6 = (struct dccp6_sock *)newsk; | |
786 | newdp = dccp_sk(newsk); | |
787 | newinet = inet_sk(newsk); | |
788 | newinet->pinet6 = &newdp6->inet6; | |
789 | newnp = inet6_sk(newsk); | |
790 | ||
791 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
792 | ||
793 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
794 | newinet->daddr); | |
795 | ||
796 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
797 | newinet->saddr); | |
798 | ||
799 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
800 | ||
801 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
802 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
803 | newnp->pktoptions = NULL; | |
804 | newnp->opt = NULL; | |
805 | newnp->mcast_oif = inet6_iif(skb); | |
806 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
807 | ||
808 | /* | |
809 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
810 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
811 | * that function for the gory details. -acme | |
812 | */ | |
813 | ||
814 | /* It is tricky place. Until this moment IPv4 tcp | |
815 | worked with IPv6 icsk.icsk_af_ops. | |
816 | Sync it now. | |
817 | */ | |
d83d8461 | 818 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
819 | |
820 | return newsk; | |
821 | } | |
822 | ||
823 | opt = np->opt; | |
824 | ||
825 | if (sk_acceptq_is_full(sk)) | |
826 | goto out_overflow; | |
827 | ||
828 | if (np->rxopt.bits.osrcrt == 2 && | |
829 | opt == NULL && ireq6->pktopts) { | |
830 | struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts); | |
831 | if (rxopt->srcrt) | |
832 | opt = ipv6_invert_rthdr(sk, | |
833 | (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw + | |
834 | rxopt->srcrt)); | |
835 | } | |
836 | ||
837 | if (dst == NULL) { | |
838 | struct in6_addr *final_p = NULL, final; | |
839 | struct flowi fl; | |
840 | ||
841 | memset(&fl, 0, sizeof(fl)); | |
842 | fl.proto = IPPROTO_DCCP; | |
843 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
844 | if (opt && opt->srcrt) { | |
845 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
846 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
847 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
848 | final_p = &final; | |
849 | } | |
850 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
851 | fl.oif = sk->sk_bound_dev_if; | |
852 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
853 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
854 | ||
855 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
856 | goto out; | |
857 | ||
858 | if (final_p) | |
859 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
860 | ||
861 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
862 | goto out; | |
863 | } | |
864 | ||
865 | newsk = dccp_create_openreq_child(sk, req, skb); | |
866 | if (newsk == NULL) | |
867 | goto out; | |
868 | ||
869 | /* | |
870 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
871 | * count here, dccp_create_openreq_child now does this for us, see the | |
872 | * comment in that function for the gory details. -acme | |
873 | */ | |
874 | ||
875 | ip6_dst_store(newsk, dst, NULL); | |
876 | newsk->sk_route_caps = dst->dev->features & | |
877 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); | |
878 | ||
879 | newdp6 = (struct dccp6_sock *)newsk; | |
880 | newinet = inet_sk(newsk); | |
881 | newinet->pinet6 = &newdp6->inet6; | |
882 | newdp = dccp_sk(newsk); | |
883 | newnp = inet6_sk(newsk); | |
884 | ||
885 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
886 | ||
887 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
888 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
889 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
890 | newsk->sk_bound_dev_if = ireq6->iif; | |
891 | ||
892 | /* Now IPv6 options... | |
893 | ||
894 | First: no IPv4 options. | |
895 | */ | |
896 | newinet->opt = NULL; | |
897 | ||
898 | /* Clone RX bits */ | |
899 | newnp->rxopt.all = np->rxopt.all; | |
900 | ||
901 | /* Clone pktoptions received with SYN */ | |
902 | newnp->pktoptions = NULL; | |
903 | if (ireq6->pktopts != NULL) { | |
904 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
905 | kfree_skb(ireq6->pktopts); | |
906 | ireq6->pktopts = NULL; | |
907 | if (newnp->pktoptions) | |
908 | skb_set_owner_r(newnp->pktoptions, newsk); | |
909 | } | |
910 | newnp->opt = NULL; | |
911 | newnp->mcast_oif = inet6_iif(skb); | |
912 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
913 | ||
914 | /* Clone native IPv6 options from listening socket (if any) | |
915 | ||
916 | Yes, keeping reference count would be much more clever, | |
917 | but we make one more one thing there: reattach optmem | |
918 | to newsk. | |
919 | */ | |
920 | if (opt) { | |
921 | newnp->opt = ipv6_dup_options(newsk, opt); | |
922 | if (opt != np->opt) | |
923 | sock_kfree_s(sk, opt, opt->tot_len); | |
924 | } | |
925 | ||
d83d8461 | 926 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
3df80d93 | 927 | if (newnp->opt) |
d83d8461 ACM |
928 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
929 | newnp->opt->opt_flen); | |
3df80d93 ACM |
930 | |
931 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
932 | ||
933 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
934 | ||
935 | __inet6_hash(&dccp_hashinfo, newsk); | |
936 | inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
937 | ||
938 | return newsk; | |
939 | ||
940 | out_overflow: | |
941 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
942 | out: | |
943 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
944 | if (opt && opt != np->opt) | |
945 | sock_kfree_s(sk, opt, opt->tot_len); | |
946 | dst_release(dst); | |
947 | return NULL; | |
948 | } | |
949 | ||
950 | /* The socket must have it's spinlock held when we get | |
951 | * here. | |
952 | * | |
953 | * We have a potential double-lock case here, so even when | |
954 | * doing backlog processing we use the BH locking scheme. | |
955 | * This is because we cannot sleep with the original spinlock | |
956 | * held. | |
957 | */ | |
958 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
959 | { | |
960 | struct ipv6_pinfo *np = inet6_sk(sk); | |
961 | struct sk_buff *opt_skb = NULL; | |
962 | ||
963 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
964 | goes to IPv4 receive handler and backlogged. | |
965 | From backlog it always goes here. Kerboom... | |
966 | Fortunately, dccp_rcv_established and rcv_established | |
967 | handle them correctly, but it is not case with | |
968 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
969 | */ | |
970 | ||
971 | if (skb->protocol == htons(ETH_P_IP)) | |
972 | return dccp_v4_do_rcv(sk, skb); | |
973 | ||
974 | if (sk_filter(sk, skb, 0)) | |
975 | goto discard; | |
976 | ||
977 | /* | |
978 | * socket locking is here for SMP purposes as backlog rcv | |
979 | * is currently called with bh processing disabled. | |
980 | */ | |
981 | ||
982 | /* Do Stevens' IPV6_PKTOPTIONS. | |
983 | ||
984 | Yes, guys, it is the only place in our code, where we | |
985 | may make it not affecting IPv4. | |
986 | The rest of code is protocol independent, | |
987 | and I do not like idea to uglify IPv4. | |
988 | ||
989 | Actually, all the idea behind IPV6_PKTOPTIONS | |
990 | looks not very well thought. For now we latch | |
991 | options, received in the last packet, enqueued | |
992 | by tcp. Feel free to propose better solution. | |
993 | --ANK (980728) | |
994 | */ | |
995 | if (np->rxopt.all) | |
996 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
997 | ||
998 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
999 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
1000 | goto reset; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | if (sk->sk_state == DCCP_LISTEN) { | |
1005 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); | |
1006 | if (!nsk) | |
1007 | goto discard; | |
1008 | ||
1009 | /* | |
1010 | * Queue it on the new socket if the new socket is active, | |
1011 | * otherwise we just shortcircuit this and continue with | |
1012 | * the new socket.. | |
1013 | */ | |
1014 | if(nsk != sk) { | |
1015 | if (dccp_child_process(sk, nsk, skb)) | |
1016 | goto reset; | |
1017 | if (opt_skb) | |
1018 | __kfree_skb(opt_skb); | |
1019 | return 0; | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
1024 | goto reset; | |
1025 | return 0; | |
1026 | ||
1027 | reset: | |
1028 | dccp_v6_ctl_send_reset(skb); | |
1029 | discard: | |
1030 | if (opt_skb) | |
1031 | __kfree_skb(opt_skb); | |
1032 | kfree_skb(skb); | |
1033 | return 0; | |
1034 | } | |
1035 | ||
951dbc8a | 1036 | static int dccp_v6_rcv(struct sk_buff **pskb) |
3df80d93 ACM |
1037 | { |
1038 | const struct dccp_hdr *dh; | |
1039 | struct sk_buff *skb = *pskb; | |
1040 | struct sock *sk; | |
3df80d93 ACM |
1041 | |
1042 | /* Step 1: Check header basics: */ | |
1043 | ||
1044 | if (dccp_invalid_packet(skb)) | |
1045 | goto discard_it; | |
1046 | ||
1047 | dh = dccp_hdr(skb); | |
1048 | ||
1049 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); | |
1050 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
1051 | ||
1052 | if (dccp_packet_without_ack(skb)) | |
1053 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
1054 | else | |
1055 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
1056 | ||
1057 | /* Step 2: | |
1058 | * Look up flow ID in table and get corresponding socket */ | |
1059 | sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr, | |
1060 | dh->dccph_sport, | |
1061 | &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport), | |
1062 | inet6_iif(skb)); | |
1063 | /* | |
1064 | * Step 2: | |
1065 | * If no socket ... | |
1066 | * Generate Reset(No Connection) unless P.type == Reset | |
1067 | * Drop packet and return | |
1068 | */ | |
1069 | if (sk == NULL) | |
1070 | goto no_dccp_socket; | |
1071 | ||
1072 | /* | |
1073 | * Step 2: | |
1074 | * ... or S.state == TIMEWAIT, | |
1075 | * Generate Reset(No Connection) unless P.type == Reset | |
1076 | * Drop packet and return | |
1077 | */ | |
1078 | ||
1079 | if (sk->sk_state == DCCP_TIME_WAIT) | |
1080 | goto do_time_wait; | |
1081 | ||
1082 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1083 | goto discard_and_relse; | |
1084 | ||
25995ff5 | 1085 | return sk_receive_skb(sk, skb) ? -1 : 0; |
3df80d93 ACM |
1086 | |
1087 | no_dccp_socket: | |
1088 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1089 | goto discard_it; | |
1090 | /* | |
1091 | * Step 2: | |
1092 | * Generate Reset(No Connection) unless P.type == Reset | |
1093 | * Drop packet and return | |
1094 | */ | |
1095 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
1096 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
1097 | DCCP_RESET_CODE_NO_CONNECTION; | |
1098 | dccp_v6_ctl_send_reset(skb); | |
1099 | } | |
1100 | discard_it: | |
1101 | ||
1102 | /* | |
1103 | * Discard frame | |
1104 | */ | |
1105 | ||
1106 | kfree_skb(skb); | |
1107 | return 0; | |
1108 | ||
1109 | discard_and_relse: | |
1110 | sock_put(sk); | |
1111 | goto discard_it; | |
1112 | ||
1113 | do_time_wait: | |
1114 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
1115 | goto no_dccp_socket; | |
1116 | } | |
1117 | ||
1118 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { | |
1119 | .queue_xmit = inet6_csk_xmit, | |
1120 | .send_check = dccp_v6_send_check, | |
1121 | .rebuild_header = inet6_sk_rebuild_header, | |
1122 | .conn_request = dccp_v6_conn_request, | |
1123 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1124 | .net_header_len = sizeof(struct ipv6hdr), | |
1125 | .setsockopt = ipv6_setsockopt, | |
1126 | .getsockopt = ipv6_getsockopt, | |
1127 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1128 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1129 | }; | |
1130 | ||
1131 | /* | |
1132 | * DCCP over IPv4 via INET6 API | |
1133 | */ | |
1134 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
1135 | .queue_xmit = ip_queue_xmit, | |
1136 | .send_check = dccp_v4_send_check, | |
1137 | .rebuild_header = inet_sk_rebuild_header, | |
1138 | .conn_request = dccp_v6_conn_request, | |
1139 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1140 | .net_header_len = sizeof(struct iphdr), | |
1141 | .setsockopt = ipv6_setsockopt, | |
1142 | .getsockopt = ipv6_getsockopt, | |
1143 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1144 | .sockaddr_len = sizeof(struct sockaddr_in6) | |
1145 | }; | |
1146 | ||
1147 | /* NOTE: A lot of things set to zero explicitly by call to | |
1148 | * sk_alloc() so need not be done here. | |
1149 | */ | |
1150 | static int dccp_v6_init_sock(struct sock *sk) | |
1151 | { | |
72478873 ACM |
1152 | static __u8 dccp_v6_ctl_sock_initialized; |
1153 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1154 | |
72478873 ACM |
1155 | if (err == 0) { |
1156 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1157 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1158 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1159 | } |
3df80d93 ACM |
1160 | |
1161 | return err; | |
1162 | } | |
1163 | ||
1164 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1165 | { | |
3e0fadc5 | 1166 | dccp_destroy_sock(sk); |
3df80d93 ACM |
1167 | return inet6_destroy_sock(sk); |
1168 | } | |
1169 | ||
1170 | static struct proto dccp_v6_prot = { | |
1171 | .name = "DCCPv6", | |
1172 | .owner = THIS_MODULE, | |
1173 | .close = dccp_close, | |
1174 | .connect = dccp_v6_connect, | |
1175 | .disconnect = dccp_disconnect, | |
1176 | .ioctl = dccp_ioctl, | |
1177 | .init = dccp_v6_init_sock, | |
1178 | .setsockopt = dccp_setsockopt, | |
1179 | .getsockopt = dccp_getsockopt, | |
1180 | .sendmsg = dccp_sendmsg, | |
1181 | .recvmsg = dccp_recvmsg, | |
1182 | .backlog_rcv = dccp_v6_do_rcv, | |
1183 | .hash = dccp_v6_hash, | |
1184 | .unhash = dccp_unhash, | |
1185 | .accept = inet_csk_accept, | |
1186 | .get_port = dccp_v6_get_port, | |
1187 | .shutdown = dccp_shutdown, | |
1188 | .destroy = dccp_v6_destroy_sock, | |
1189 | .orphan_count = &dccp_orphan_count, | |
1190 | .max_header = MAX_DCCP_HEADER, | |
1191 | .obj_size = sizeof(struct dccp6_sock), | |
1192 | .rsk_prot = &dccp6_request_sock_ops, | |
6d6ee43e | 1193 | .twsk_prot = &dccp6_timewait_sock_ops, |
3df80d93 ACM |
1194 | }; |
1195 | ||
1196 | static struct inet6_protocol dccp_v6_protocol = { | |
1197 | .handler = dccp_v6_rcv, | |
1198 | .err_handler = dccp_v6_err, | |
1199 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
1200 | }; | |
1201 | ||
1202 | static struct proto_ops inet6_dccp_ops = { | |
1203 | .family = PF_INET6, | |
1204 | .owner = THIS_MODULE, | |
1205 | .release = inet6_release, | |
1206 | .bind = inet6_bind, | |
1207 | .connect = inet_stream_connect, | |
1208 | .socketpair = sock_no_socketpair, | |
1209 | .accept = inet_accept, | |
1210 | .getname = inet6_getname, | |
1211 | .poll = dccp_poll, | |
1212 | .ioctl = inet6_ioctl, | |
1213 | .listen = inet_dccp_listen, | |
1214 | .shutdown = inet_shutdown, | |
1215 | .setsockopt = sock_common_setsockopt, | |
1216 | .getsockopt = sock_common_getsockopt, | |
1217 | .sendmsg = inet_sendmsg, | |
1218 | .recvmsg = sock_common_recvmsg, | |
1219 | .mmap = sock_no_mmap, | |
1220 | .sendpage = sock_no_sendpage, | |
1221 | }; | |
1222 | ||
1223 | static struct inet_protosw dccp_v6_protosw = { | |
1224 | .type = SOCK_DCCP, | |
1225 | .protocol = IPPROTO_DCCP, | |
1226 | .prot = &dccp_v6_prot, | |
1227 | .ops = &inet6_dccp_ops, | |
1228 | .capability = -1, | |
d83d8461 | 1229 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1230 | }; |
1231 | ||
1232 | static int __init dccp_v6_init(void) | |
1233 | { | |
1234 | int err = proto_register(&dccp_v6_prot, 1); | |
1235 | ||
1236 | if (err != 0) | |
1237 | goto out; | |
1238 | ||
1239 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1240 | if (err != 0) | |
1241 | goto out_unregister_proto; | |
1242 | ||
1243 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1244 | |
c4d93909 ACM |
1245 | err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
1246 | SOCK_DCCP, IPPROTO_DCCP); | |
1247 | if (err != 0) | |
72478873 | 1248 | goto out_unregister_protosw; |
3df80d93 ACM |
1249 | out: |
1250 | return err; | |
72478873 ACM |
1251 | out_unregister_protosw: |
1252 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1253 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1254 | out_unregister_proto: |
1255 | proto_unregister(&dccp_v6_prot); | |
1256 | goto out; | |
1257 | } | |
1258 | ||
1259 | static void __exit dccp_v6_exit(void) | |
1260 | { | |
1261 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1262 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1263 | proto_unregister(&dccp_v6_prot); | |
1264 | } | |
1265 | ||
1266 | module_init(dccp_v6_init); | |
1267 | module_exit(dccp_v6_exit); | |
1268 | ||
1269 | /* | |
1270 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1271 | * values directly, Also cover the case where the protocol is not specified, | |
1272 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1273 | */ | |
1274 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); | |
1275 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); | |
1276 | MODULE_LICENSE("GPL"); | |
1277 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1278 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |