?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
[linux-2.6/linux-mips.git] / net / dccp / ipv6.c
blob0f328c753c575ea1a07a178e52605a942adeb71f
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/inet_sock.h>
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>
30 #include <net/ip6_checksum.h>
31 #include <net/xfrm.h>
32
33 #include "dccp.h"
34 #include "ipv6.h"
35
36 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
38
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) {
59 dccp_hash(sk);
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
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
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;
96 struct inet_connection_sock *icsk = inet_csk(sk);
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 * connect() to INADDR_ANY means loopback (BSD'ism).
130 */
131 if (ipv6_addr_any(&usin->sin6_addr))
132 usin->sin6_addr.s6_addr[15] = 1;
133
134 addr_type = ipv6_addr_type(&usin->sin6_addr);
135
136 if (addr_type & IPV6_ADDR_MULTICAST)
137 return -ENETUNREACH;
138
139 if (addr_type & IPV6_ADDR_LINKLOCAL) {
140 if (addr_len >= sizeof(struct sockaddr_in6) &&
141 usin->sin6_scope_id) {
142 /* If interface is set while binding, indices
143 * must coincide.
144 */
145 if (sk->sk_bound_dev_if &&
146 sk->sk_bound_dev_if != usin->sin6_scope_id)
147 return -EINVAL;
148
149 sk->sk_bound_dev_if = usin->sin6_scope_id;
150 }
151
152 /* Connect to link-local address requires an interface */
153 if (!sk->sk_bound_dev_if)
154 return -EINVAL;
155 }
156
157 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
158 np->flow_label = fl.fl6_flowlabel;
159
160 /*
161 * DCCP over IPv4
162 */
163 if (addr_type == IPV6_ADDR_MAPPED) {
164 u32 exthdrlen = icsk->icsk_ext_hdr_len;
165 struct sockaddr_in sin;
166
167 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
168
169 if (__ipv6_only_sock(sk))
170 return -ENETUNREACH;
171
172 sin.sin_family = AF_INET;
173 sin.sin_port = usin->sin6_port;
174 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
175
176 icsk->icsk_af_ops = &dccp_ipv6_mapped;
177 sk->sk_backlog_rcv = dccp_v4_do_rcv;
178
179 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
180 if (err) {
181 icsk->icsk_ext_hdr_len = exthdrlen;
182 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
183 sk->sk_backlog_rcv = dccp_v6_do_rcv;
184 goto failure;
185 } else {
186 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
187 inet->saddr);
188 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
189 inet->rcv_saddr);
190 }
191
192 return err;
193 }
194
195 if (!ipv6_addr_any(&np->rcv_saddr))
196 saddr = &np->rcv_saddr;
197
198 fl.proto = IPPROTO_DCCP;
199 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
200 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
201 fl.oif = sk->sk_bound_dev_if;
202 fl.fl_ip_dport = usin->sin6_port;
203 fl.fl_ip_sport = inet->sport;
204
205 if (np->opt != NULL && np->opt->srcrt != NULL) {
206 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
207
208 ipv6_addr_copy(&final, &fl.fl6_dst);
209 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
210 final_p = &final;
211 }
212
213 err = ip6_dst_lookup(sk, &dst, &fl);
214 if (err)
215 goto failure;
216
217 if (final_p)
218 ipv6_addr_copy(&fl.fl6_dst, final_p);
219
220 err = xfrm_lookup(&dst, &fl, sk, 0);
221 if (err < 0)
222 goto failure;
223
224 if (saddr == NULL) {
225 saddr = &fl.fl6_src;
226 ipv6_addr_copy(&np->rcv_saddr, saddr);
227 }
228
229 /* set the source address */
230 ipv6_addr_copy(&np->saddr, saddr);
231 inet->rcv_saddr = LOOPBACK4_IPV6;
232
233 ip6_dst_store(sk, dst, NULL);
234
235 icsk->icsk_ext_hdr_len = 0;
236 if (np->opt != NULL)
237 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
238 np->opt->opt_nflen);
239
240 inet->dport = usin->sin6_port;
241
242 dccp_set_state(sk, DCCP_REQUESTING);
243 err = inet6_hash_connect(&dccp_death_row, sk);
244 if (err)
245 goto late_failure;
246 /* FIXME */
247 #if 0
248 dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
249 np->daddr.s6_addr32,
250 inet->sport,
251 inet->dport);
252 #endif
253 err = dccp_connect(sk);
254 if (err)
255 goto late_failure;
256
257 return 0;
258
259 late_failure:
260 dccp_set_state(sk, DCCP_CLOSED);
261 __sk_dst_reset(sk);
262 failure:
263 inet->dport = 0;
264 sk->sk_route_caps = 0;
265 return err;
266 }
267
268 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
269 int type, int code, int offset, __be32 info)
270 {
271 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
272 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
273 struct ipv6_pinfo *np;
274 struct sock *sk;
275 int err;
276 __u64 seq;
277
278 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
279 &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
280
281 if (sk == NULL) {
282 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
283 return;
284 }
285
286 if (sk->sk_state == DCCP_TIME_WAIT) {
287 inet_twsk_put((struct inet_timewait_sock *)sk);
288 return;
289 }
290
291 bh_lock_sock(sk);
292 if (sock_owned_by_user(sk))
293 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
294
295 if (sk->sk_state == DCCP_CLOSED)
296 goto out;
297
298 np = inet6_sk(sk);
299
300 if (type == ICMPV6_PKT_TOOBIG) {
301 struct dst_entry *dst = NULL;
302
303 if (sock_owned_by_user(sk))
304 goto out;
305 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
306 goto out;
307
308 /* icmp should have updated the destination cache entry */
309 dst = __sk_dst_check(sk, np->dst_cookie);
310 if (dst == NULL) {
311 struct inet_sock *inet = inet_sk(sk);
312 struct flowi fl;
313
314 /* BUGGG_FUTURE: Again, it is not clear how
315 to handle rthdr case. Ignore this complexity
316 for now.
317 */
318 memset(&fl, 0, sizeof(fl));
319 fl.proto = IPPROTO_DCCP;
320 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
321 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
322 fl.oif = sk->sk_bound_dev_if;
323 fl.fl_ip_dport = inet->dport;
324 fl.fl_ip_sport = inet->sport;
325
326 err = ip6_dst_lookup(sk, &dst, &fl);
327 if (err) {
328 sk->sk_err_soft = -err;
329 goto out;
330 }
331
332 err = xfrm_lookup(&dst, &fl, sk, 0);
333 if (err < 0) {
334 sk->sk_err_soft = -err;
335 goto out;
336 }
337 } else
338 dst_hold(dst);
339
340 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
341 dccp_sync_mss(sk, dst_mtu(dst));
342 } /* else let the usual retransmit timer handle it */
343 dst_release(dst);
344 goto out;
345 }
346
347 icmpv6_err_convert(type, code, &err);
348
349 seq = DCCP_SKB_CB(skb)->dccpd_seq;
350 /* Might be for an request_sock */
351 switch (sk->sk_state) {
352 struct request_sock *req, **prev;
353 case DCCP_LISTEN:
354 if (sock_owned_by_user(sk))
355 goto out;
356
357 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
358 &hdr->daddr, &hdr->saddr,
359 inet6_iif(skb));
360 if (req == NULL)
361 goto out;
362
363 /*
364 * ICMPs are not backlogged, hence we cannot get an established
365 * 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 dccp_done(sk);
389 } else
390 sk->sk_err_soft = err;
391 goto out;
392 }
393
394 if (!sock_owned_by_user(sk) && np->recverr) {
395 sk->sk_err = err;
396 sk->sk_error_report(sk);
397 } else
398 sk->sk_err_soft = err;
399
400 out:
401 bh_unlock_sock(sk);
402 sock_put(sk);
403 }
404
405
406 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
407 struct dst_entry *dst)
408 {
409 struct inet6_request_sock *ireq6 = inet6_rsk(req);
410 struct ipv6_pinfo *np = inet6_sk(sk);
411 struct sk_buff *skb;
412 struct ipv6_txoptions *opt = NULL;
413 struct in6_addr *final_p = NULL, final;
414 struct flowi fl;
415 int err = -1;
416
417 memset(&fl, 0, sizeof(fl));
418 fl.proto = IPPROTO_DCCP;
419 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
420 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
421 fl.fl6_flowlabel = 0;
422 fl.oif = ireq6->iif;
423 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
424 fl.fl_ip_sport = inet_sk(sk)->sport;
425
426 if (dst == NULL) {
427 opt = np->opt;
428 if (opt == NULL &&
429 np->rxopt.bits.osrcrt == 2 &&
430 ireq6->pktopts) {
431 struct sk_buff *pktopts = ireq6->pktopts;
432 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
433
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 != NULL && opt->srcrt != NULL) {
441 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
442
443 ipv6_addr_copy(&final, &fl.fl6_dst);
444 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
445 final_p = &final;
446 }
447
448 err = ip6_dst_lookup(sk, &dst, &fl);
449 if (err)
450 goto done;
451
452 if (final_p)
453 ipv6_addr_copy(&fl.fl6_dst, final_p);
454
455 err = xfrm_lookup(&dst, &fl, sk, 0);
456 if (err < 0)
457 goto done;
458 }
459
460 skb = dccp_make_response(sk, dst, req);
461 if (skb != NULL) {
462 struct dccp_hdr *dh = dccp_hdr(skb);
463
464 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
465 &ireq6->loc_addr,
466 &ireq6->rmt_addr,
467 csum_partial((char *)dh,
468 skb->len,
469 skb->csum));
470 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
471 err = ip6_xmit(sk, skb, &fl, opt, 0);
472 if (err == NET_XMIT_CN)
473 err = 0;
474 }
475
476 done:
477 if (opt != NULL && opt != np->opt)
478 sock_kfree_s(sk, opt, opt->tot_len);
479 dst_release(dst);
480 return err;
481 }
482
483 static void dccp_v6_reqsk_destructor(struct request_sock *req)
484 {
485 if (inet6_rsk(req)->pktopts != NULL)
486 kfree_skb(inet6_rsk(req)->pktopts);
487 }
488
489 static struct request_sock_ops dccp6_request_sock_ops = {
490 .family = AF_INET6,
491 .obj_size = sizeof(struct dccp6_request_sock),
492 .rtx_syn_ack = dccp_v6_send_response,
493 .send_ack = dccp_v6_reqsk_send_ack,
494 .destructor = dccp_v6_reqsk_destructor,
495 .send_reset = dccp_v6_ctl_send_reset,
496 };
497
498 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
499 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
500 };
501
502 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
503 {
504 struct ipv6_pinfo *np = inet6_sk(sk);
505 struct dccp_hdr *dh = dccp_hdr(skb);
506
507 dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
508 len, IPPROTO_DCCP,
509 csum_partial((char *)dh,
510 dh->dccph_doff << 2,
511 skb->csum));
512 }
513
514 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
515 {
516 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
517 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
518 sizeof(struct dccp_hdr_ext) +
519 sizeof(struct dccp_hdr_reset);
520 struct sk_buff *skb;
521 struct flowi fl;
522 u64 seqno;
523
524 if (rxdh->dccph_type == DCCP_PKT_RESET)
525 return;
526
527 if (!ipv6_unicast_destination(rxskb))
528 return;
529
530 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
531 GFP_ATOMIC);
532 if (skb == NULL)
533 return;
534
535 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
536
537 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
538 dh = dccp_hdr(skb);
539 memset(dh, 0, dccp_hdr_reset_len);
540
541 /* Swap the send and the receive. */
542 dh->dccph_type = DCCP_PKT_RESET;
543 dh->dccph_sport = rxdh->dccph_dport;
544 dh->dccph_dport = rxdh->dccph_sport;
545 dh->dccph_doff = dccp_hdr_reset_len / 4;
546 dh->dccph_x = 1;
547 dccp_hdr_reset(skb)->dccph_reset_code =
548 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
549
550 /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
551 seqno = 0;
552 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
553 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
554
555 dccp_hdr_set_seq(dh, seqno);
556 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
557 DCCP_SKB_CB(rxskb)->dccpd_seq);
558
559 memset(&fl, 0, sizeof(fl));
560 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
561 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
562 dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
563 sizeof(*dh), IPPROTO_DCCP,
564 skb->csum);
565 fl.proto = IPPROTO_DCCP;
566 fl.oif = inet6_iif(rxskb);
567 fl.fl_ip_dport = dh->dccph_dport;
568 fl.fl_ip_sport = dh->dccph_sport;
569
570 /* sk = NULL, but it is safe for now. RST socket required. */
571 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
572 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
573 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
574 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
575 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
576 return;
577 }
578 }
579
580 kfree_skb(skb);
581 }
582
583 static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb)
584 {
585 struct flowi fl;
586 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
587 const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
588 sizeof(struct dccp_hdr_ext) +
589 sizeof(struct dccp_hdr_ack_bits);
590 struct sk_buff *skb;
591
592 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
593 GFP_ATOMIC);
594 if (skb == NULL)
595 return;
596
597 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
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;
609
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) {
627 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
628 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
629 return;
630 }
631 }
632
633 kfree_skb(skb);
634 }
635
636 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
637 struct request_sock *req)
638 {
639 dccp_v6_ctl_send_ack(skb);
640 }
641
642 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
643 {
644 const struct dccp_hdr *dh = dccp_hdr(skb);
645 const struct ipv6hdr *iph = skb->nh.ipv6h;
646 struct sock *nsk;
647 struct request_sock **prev;
648 /* Find possible connection requests. */
649 struct request_sock *req = inet6_csk_search_req(sk, &prev,
650 dh->dccph_sport,
651 &iph->saddr,
652 &iph->daddr,
653 inet6_iif(skb));
654 if (req != NULL)
655 return dccp_check_req(sk, skb, req, prev);
656
657 nsk = __inet6_lookup_established(&dccp_hashinfo,
658 &iph->saddr, dh->dccph_sport,
659 &iph->daddr, ntohs(dh->dccph_dport),
660 inet6_iif(skb));
661 if (nsk != NULL) {
662 if (nsk->sk_state != DCCP_TIME_WAIT) {
663 bh_lock_sock(nsk);
664 return nsk;
665 }
666 inet_twsk_put((struct inet_timewait_sock *)nsk);
667 return NULL;
668 }
669
670 return sk;
671 }
672
673 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
674 {
675 struct inet_request_sock *ireq;
676 struct dccp_sock dp;
677 struct request_sock *req;
678 struct dccp_request_sock *dreq;
679 struct inet6_request_sock *ireq6;
680 struct ipv6_pinfo *np = inet6_sk(sk);
681 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
682 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
683 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
684
685 if (skb->protocol == htons(ETH_P_IP))
686 return dccp_v4_conn_request(sk, skb);
687
688 if (!ipv6_unicast_destination(skb))
689 goto drop;
690
691 if (dccp_bad_service_code(sk, service)) {
692 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
693 goto drop;
694 }
695 /*
696 * There are no SYN attacks on IPv6, yet...
697 */
698 if (inet_csk_reqsk_queue_is_full(sk))
699 goto drop;
700
701 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
702 goto drop;
703
704 req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
705 if (req == NULL)
706 goto drop;
707
708 /* FIXME: process options */
709
710 dccp_openreq_init(req, &dp, skb);
711
712 ireq6 = inet6_rsk(req);
713 ireq = inet_rsk(req);
714 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
715 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
716 req->rcv_wnd = 100; /* Fake, option parsing will get the
717 right value */
718 ireq6->pktopts = NULL;
719
720 if (ipv6_opt_accepted(sk, skb) ||
721 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
722 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
723 atomic_inc(&skb->users);
724 ireq6->pktopts = skb;
725 }
726 ireq6->iif = sk->sk_bound_dev_if;
727
728 /* So that link locals have meaning */
729 if (!sk->sk_bound_dev_if &&
730 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
731 ireq6->iif = inet6_iif(skb);
732
733 /*
734 * Step 3: Process LISTEN state
735 *
736 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
737 *
738 * In fact we defer setting S.GSR, S.SWL, S.SWH to
739 * dccp_create_openreq_child.
740 */
741 dreq = dccp_rsk(req);
742 dreq->dreq_isr = dcb->dccpd_seq;
743 dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
744 dreq->dreq_service = service;
745
746 if (dccp_v6_send_response(sk, req, NULL))
747 goto drop_and_free;
748
749 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
750 return 0;
751
752 drop_and_free:
753 reqsk_free(req);
754 drop:
755 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
756 dcb->dccpd_reset_code = reset_code;
757 return -1;
758 }
759
760 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
761 struct sk_buff *skb,
762 struct request_sock *req,
763 struct dst_entry *dst)
764 {
765 struct inet6_request_sock *ireq6 = inet6_rsk(req);
766 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
767 struct inet_sock *newinet;
768 struct dccp_sock *newdp;
769 struct dccp6_sock *newdp6;
770 struct sock *newsk;
771 struct ipv6_txoptions *opt;
772
773 if (skb->protocol == htons(ETH_P_IP)) {
774 /*
775 * v6 mapped
776 */
777 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
778 if (newsk == NULL)
779 return NULL;
780
781 newdp6 = (struct dccp6_sock *)newsk;
782 newdp = dccp_sk(newsk);
783 newinet = inet_sk(newsk);
784 newinet->pinet6 = &newdp6->inet6;
785 newnp = inet6_sk(newsk);
786
787 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
788
789 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
790 newinet->daddr);
791
792 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
793 newinet->saddr);
794
795 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
796
797 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
798 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
799 newnp->pktoptions = NULL;
800 newnp->opt = NULL;
801 newnp->mcast_oif = inet6_iif(skb);
802 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
803
804 /*
805 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
806 * here, dccp_create_openreq_child now does this for us, see the comment in
807 * that function for the gory details. -acme
808 */
809
810 /* It is tricky place. Until this moment IPv4 tcp
811 worked with IPv6 icsk.icsk_af_ops.
812 Sync it now.
813 */
814 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
815
816 return newsk;
817 }
818
819 opt = np->opt;
820
821 if (sk_acceptq_is_full(sk))
822 goto out_overflow;
823
824 if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
825 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
826
827 if (rxopt->srcrt)
828 opt = ipv6_invert_rthdr(sk,
829 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
830 rxopt->srcrt));
831 }
832
833 if (dst == NULL) {
834 struct in6_addr *final_p = NULL, final;
835 struct flowi fl;
836
837 memset(&fl, 0, sizeof(fl));
838 fl.proto = IPPROTO_DCCP;
839 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
840 if (opt != NULL && opt->srcrt != NULL) {
841 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
842
843 ipv6_addr_copy(&final, &fl.fl6_dst);
844 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
845 final_p = &final;
846 }
847 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
848 fl.oif = sk->sk_bound_dev_if;
849 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
850 fl.fl_ip_sport = inet_sk(sk)->sport;
851
852 if (ip6_dst_lookup(sk, &dst, &fl))
853 goto out;
854
855 if (final_p)
856 ipv6_addr_copy(&fl.fl6_dst, final_p);
857
858 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
859 goto out;
860 }
861
862 newsk = dccp_create_openreq_child(sk, req, skb);
863 if (newsk == NULL)
864 goto out;
865
866 /*
867 * No need to charge this sock to the relevant IPv6 refcnt debug socks
868 * count here, dccp_create_openreq_child now does this for us, see the
869 * comment in that function for the gory details. -acme
870 */
871
872 ip6_dst_store(newsk, dst, NULL);
873 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
874 NETIF_F_TSO);
875 newdp6 = (struct dccp6_sock *)newsk;
876 newinet = inet_sk(newsk);
877 newinet->pinet6 = &newdp6->inet6;
878 newdp = dccp_sk(newsk);
879 newnp = inet6_sk(newsk);
880
881 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
882
883 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
884 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
885 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
886 newsk->sk_bound_dev_if = ireq6->iif;
887
888 /* Now IPv6 options...
889
890 First: no IPv4 options.
891 */
892 newinet->opt = NULL;
893
894 /* Clone RX bits */
895 newnp->rxopt.all = np->rxopt.all;
896
897 /* Clone pktoptions received with SYN */
898 newnp->pktoptions = NULL;
899 if (ireq6->pktopts != NULL) {
900 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
901 kfree_skb(ireq6->pktopts);
902 ireq6->pktopts = NULL;
903 if (newnp->pktoptions)
904 skb_set_owner_r(newnp->pktoptions, newsk);
905 }
906 newnp->opt = NULL;
907 newnp->mcast_oif = inet6_iif(skb);
908 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
909
910 /*
911 * Clone native IPv6 options from listening socket (if any)
912 *
913 * Yes, keeping reference count would be much more clever, but we make
914 * one more one thing there: reattach optmem to newsk.
915 */
916 if (opt != NULL) {
917 newnp->opt = ipv6_dup_options(newsk, opt);
918 if (opt != np->opt)
919 sock_kfree_s(sk, opt, opt->tot_len);
920 }
921
922 inet_csk(newsk)->icsk_ext_hdr_len = 0;
923 if (newnp->opt != NULL)
924 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
925 newnp->opt->opt_flen);
926
927 dccp_sync_mss(newsk, dst_mtu(dst));
928
929 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
930
931 __inet6_hash(&dccp_hashinfo, newsk);
932 inet_inherit_port(&dccp_hashinfo, sk, newsk);
933
934 return newsk;
935
936 out_overflow:
937 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
938 out:
939 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
940 if (opt != NULL && opt != np->opt)
941 sock_kfree_s(sk, opt, opt->tot_len);
942 dst_release(dst);
943 return NULL;
944 }
945
946 /* The socket must have it's spinlock held when we get
947 * here.
948 *
949 * We have a potential double-lock case here, so even when
950 * doing backlog processing we use the BH locking scheme.
951 * This is because we cannot sleep with the original spinlock
952 * held.
953 */
954 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
955 {
956 struct ipv6_pinfo *np = inet6_sk(sk);
957 struct sk_buff *opt_skb = NULL;
958
959 /* Imagine: socket is IPv6. IPv4 packet arrives,
960 goes to IPv4 receive handler and backlogged.
961 From backlog it always goes here. Kerboom...
962 Fortunately, dccp_rcv_established and rcv_established
963 handle them correctly, but it is not case with
964 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
965 */
966
967 if (skb->protocol == htons(ETH_P_IP))
968 return dccp_v4_do_rcv(sk, skb);
969
970 if (sk_filter(sk, skb, 0))
971 goto discard;
972
973 /*
974 * socket locking is here for SMP purposes as backlog rcv is currently
975 * called with bh processing disabled.
976 */
977
978 /* Do Stevens' IPV6_PKTOPTIONS.
979
980 Yes, guys, it is the only place in our code, where we
981 may make it not affecting IPv4.
982 The rest of code is protocol independent,
983 and I do not like idea to uglify IPv4.
984
985 Actually, all the idea behind IPV6_PKTOPTIONS
986 looks not very well thought. For now we latch
987 options, received in the last packet, enqueued
988 by tcp. Feel free to propose better solution.
989 --ANK (980728)
990 */
991 if (np->rxopt.all)
992 opt_skb = skb_clone(skb, GFP_ATOMIC);
993
994 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
995 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
996 goto reset;
997 return 0;
998 }
999
1000 if (sk->sk_state == DCCP_LISTEN) {
1001 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1002
1003 if (nsk == NULL)
1004 goto discard;
1005 /*
1006 * Queue it on the new socket if the new socket is active,
1007 * otherwise we just shortcircuit this and continue with
1008 * the new socket..
1009 */
1010 if (nsk != sk) {
1011 if (dccp_child_process(sk, nsk, skb))
1012 goto reset;
1013 if (opt_skb != NULL)
1014 __kfree_skb(opt_skb);
1015 return 0;
1016 }
1017 }
1018
1019 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1020 goto reset;
1021 return 0;
1022
1023 reset:
1024 dccp_v6_ctl_send_reset(skb);
1025 discard:
1026 if (opt_skb != NULL)
1027 __kfree_skb(opt_skb);
1028 kfree_skb(skb);
1029 return 0;
1030 }
1031
1032 static int dccp_v6_rcv(struct sk_buff **pskb)
1033 {
1034 const struct dccp_hdr *dh;
1035 struct sk_buff *skb = *pskb;
1036 struct sock *sk;
1037
1038 /* Step 1: Check header basics: */
1039
1040 if (dccp_invalid_packet(skb))
1041 goto discard_it;
1042
1043 dh = dccp_hdr(skb);
1044
1045 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1046 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1047
1048 if (dccp_packet_without_ack(skb))
1049 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1050 else
1051 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1052
1053 /* Step 2:
1054 * Look up flow ID in table and get corresponding socket */
1055 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1056 dh->dccph_sport,
1057 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1058 inet6_iif(skb));
1059 /*
1060 * Step 2:
1061 * If no socket ...
1062 * Generate Reset(No Connection) unless P.type == Reset
1063 * Drop packet and return
1064 */
1065 if (sk == NULL)
1066 goto no_dccp_socket;
1067
1068 /*
1069 * Step 2:
1070 * ... or S.state == TIMEWAIT,
1071 * Generate Reset(No Connection) unless P.type == Reset
1072 * Drop packet and return
1073 */
1074 if (sk->sk_state == DCCP_TIME_WAIT)
1075 goto do_time_wait;
1076
1077 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1078 goto discard_and_relse;
1079
1080 return sk_receive_skb(sk, skb) ? -1 : 0;
1081
1082 no_dccp_socket:
1083 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1084 goto discard_it;
1085 /*
1086 * Step 2:
1087 * Generate Reset(No Connection) unless P.type == Reset
1088 * Drop packet and return
1089 */
1090 if (dh->dccph_type != DCCP_PKT_RESET) {
1091 DCCP_SKB_CB(skb)->dccpd_reset_code =
1092 DCCP_RESET_CODE_NO_CONNECTION;
1093 dccp_v6_ctl_send_reset(skb);
1094 }
1095 discard_it:
1096
1097 /*
1098 * Discard frame
1099 */
1100
1101 kfree_skb(skb);
1102 return 0;
1103
1104 discard_and_relse:
1105 sock_put(sk);
1106 goto discard_it;
1107
1108 do_time_wait:
1109 inet_twsk_put((struct inet_timewait_sock *)sk);
1110 goto no_dccp_socket;
1111 }
1112
1113 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1114 .queue_xmit = inet6_csk_xmit,
1115 .send_check = dccp_v6_send_check,
1116 .rebuild_header = inet6_sk_rebuild_header,
1117 .conn_request = dccp_v6_conn_request,
1118 .syn_recv_sock = dccp_v6_request_recv_sock,
1119 .net_header_len = sizeof(struct ipv6hdr),
1120 .setsockopt = ipv6_setsockopt,
1121 .getsockopt = ipv6_getsockopt,
1122 .addr2sockaddr = inet6_csk_addr2sockaddr,
1123 .sockaddr_len = sizeof(struct sockaddr_in6)
1124 };
1125
1126 /*
1127 * DCCP over IPv4 via INET6 API
1128 */
1129 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1130 .queue_xmit = ip_queue_xmit,
1131 .send_check = dccp_v4_send_check,
1132 .rebuild_header = inet_sk_rebuild_header,
1133 .conn_request = dccp_v6_conn_request,
1134 .syn_recv_sock = dccp_v6_request_recv_sock,
1135 .net_header_len = sizeof(struct iphdr),
1136 .setsockopt = ipv6_setsockopt,
1137 .getsockopt = ipv6_getsockopt,
1138 .addr2sockaddr = inet6_csk_addr2sockaddr,
1139 .sockaddr_len = sizeof(struct sockaddr_in6)
1140 };
1141
1142 /* NOTE: A lot of things set to zero explicitly by call to
1143 * sk_alloc() so need not be done here.
1144 */
1145 static int dccp_v6_init_sock(struct sock *sk)
1146 {
1147 static __u8 dccp_v6_ctl_sock_initialized;
1148 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1149
1150 if (err == 0) {
1151 if (unlikely(!dccp_v6_ctl_sock_initialized))
1152 dccp_v6_ctl_sock_initialized = 1;
1153 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1154 }
1155
1156 return err;
1157 }
1158
1159 static int dccp_v6_destroy_sock(struct sock *sk)
1160 {
1161 dccp_destroy_sock(sk);
1162 return inet6_destroy_sock(sk);
1163 }
1164
1165 static struct proto dccp_v6_prot = {
1166 .name = "DCCPv6",
1167 .owner = THIS_MODULE,
1168 .close = dccp_close,
1169 .connect = dccp_v6_connect,
1170 .disconnect = dccp_disconnect,
1171 .ioctl = dccp_ioctl,
1172 .init = dccp_v6_init_sock,
1173 .setsockopt = dccp_setsockopt,
1174 .getsockopt = dccp_getsockopt,
1175 .sendmsg = dccp_sendmsg,
1176 .recvmsg = dccp_recvmsg,
1177 .backlog_rcv = dccp_v6_do_rcv,
1178 .hash = dccp_v6_hash,
1179 .unhash = dccp_unhash,
1180 .accept = inet_csk_accept,
1181 .get_port = dccp_v6_get_port,
1182 .shutdown = dccp_shutdown,
1183 .destroy = dccp_v6_destroy_sock,
1184 .orphan_count = &dccp_orphan_count,
1185 .max_header = MAX_DCCP_HEADER,
1186 .obj_size = sizeof(struct dccp6_sock),
1187 .rsk_prot = &dccp6_request_sock_ops,
1188 .twsk_prot = &dccp6_timewait_sock_ops,
1189 };
1190
1191 static struct inet6_protocol dccp_v6_protocol = {
1192 .handler = dccp_v6_rcv,
1193 .err_handler = dccp_v6_err,
1194 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1195 };
1196
1197 static struct proto_ops inet6_dccp_ops = {
1198 .family = PF_INET6,
1199 .owner = THIS_MODULE,
1200 .release = inet6_release,
1201 .bind = inet6_bind,
1202 .connect = inet_stream_connect,
1203 .socketpair = sock_no_socketpair,
1204 .accept = inet_accept,
1205 .getname = inet6_getname,
1206 .poll = dccp_poll,
1207 .ioctl = inet6_ioctl,
1208 .listen = inet_dccp_listen,
1209 .shutdown = inet_shutdown,
1210 .setsockopt = sock_common_setsockopt,
1211 .getsockopt = sock_common_getsockopt,
1212 .sendmsg = inet_sendmsg,
1213 .recvmsg = sock_common_recvmsg,
1214 .mmap = sock_no_mmap,
1215 .sendpage = sock_no_sendpage,
1216 };
1217
1218 static struct inet_protosw dccp_v6_protosw = {
1219 .type = SOCK_DCCP,
1220 .protocol = IPPROTO_DCCP,
1221 .prot = &dccp_v6_prot,
1222 .ops = &inet6_dccp_ops,
1223 .capability = -1,
1224 .flags = INET_PROTOSW_ICSK,
1225 };
1226
1227 static int __init dccp_v6_init(void)
1228 {
1229 int err = proto_register(&dccp_v6_prot, 1);
1230
1231 if (err != 0)
1232 goto out;
1233
1234 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1235 if (err != 0)
1236 goto out_unregister_proto;
1237
1238 inet6_register_protosw(&dccp_v6_protosw);
1239
1240 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1241 SOCK_DCCP, IPPROTO_DCCP);
1242 if (err != 0)
1243 goto out_unregister_protosw;
1244 out:
1245 return err;
1246 out_unregister_protosw:
1247 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1248 inet6_unregister_protosw(&dccp_v6_protosw);
1249 out_unregister_proto:
1250 proto_unregister(&dccp_v6_prot);
1251 goto out;
1252 }
1253
1254 static void __exit dccp_v6_exit(void)
1255 {
1256 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1257 inet6_unregister_protosw(&dccp_v6_protosw);
1258 proto_unregister(&dccp_v6_prot);
1259 }
1260
1261 module_init(dccp_v6_init);
1262 module_exit(dccp_v6_exit);
1263
1264 /*
1265 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1266 * values directly, Also cover the case where the protocol is not specified,
1267 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1268 */
1269 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1270 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1271 MODULE_LICENSE("GPL");
1272 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1273 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Mirror of the linux-mips.org kernel tree