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Linux 2.6.19-rc6
[cris-mirror.git] / net / dccp / ipv6.c
blobeb0ff7ab05ed3a1d4062522cf6f58846c82e3fcd
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/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>
22 #include <net/inet_sock.h>
23 #include <net/inet6_connection_sock.h>
24 #include <net/inet6_hashtables.h>
25 #include <net/ip6_route.h>
26 #include <net/ipv6.h>
27 #include <net/protocol.h>
28 #include <net/transp_v6.h>
29 #include <net/ip6_checksum.h>
30 #include <net/xfrm.h>
31
32 #include "dccp.h"
33 #include "ipv6.h"
34 #include "feat.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 security_sk_classify_flow(sk, &fl);
205
206 if (np->opt != NULL && np->opt->srcrt != NULL) {
207 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
208
209 ipv6_addr_copy(&final, &fl.fl6_dst);
210 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
211 final_p = &final;
212 }
213
214 err = ip6_dst_lookup(sk, &dst, &fl);
215 if (err)
216 goto failure;
217
218 if (final_p)
219 ipv6_addr_copy(&fl.fl6_dst, final_p);
220
221 err = xfrm_lookup(&dst, &fl, sk, 0);
222 if (err < 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, NULL);
235
236 icsk->icsk_ext_hdr_len = 0;
237 if (np->opt != NULL)
238 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
239 np->opt->opt_nflen);
240
241 inet->dport = usin->sin6_port;
242
243 dccp_set_state(sk, DCCP_REQUESTING);
244 err = inet6_hash_connect(&dccp_death_row, sk);
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,
270 int type, int code, int offset, __be32 info)
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(inet_twsk(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) {
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 if (dst == NULL) {
312 struct inet_sock *inet = inet_sk(sk);
313 struct flowi fl;
314
315 /* BUGGG_FUTURE: Again, it is not clear how
316 to handle rthdr case. Ignore this complexity
317 for now.
318 */
319 memset(&fl, 0, sizeof(fl));
320 fl.proto = IPPROTO_DCCP;
321 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
322 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
323 fl.oif = sk->sk_bound_dev_if;
324 fl.fl_ip_dport = inet->dport;
325 fl.fl_ip_sport = inet->sport;
326 security_sk_classify_flow(sk, &fl);
327
328 err = ip6_dst_lookup(sk, &dst, &fl);
329 if (err) {
330 sk->sk_err_soft = -err;
331 goto out;
332 }
333
334 err = xfrm_lookup(&dst, &fl, sk, 0);
335 if (err < 0) {
336 sk->sk_err_soft = -err;
337 goto out;
338 }
339 } else
340 dst_hold(dst);
341
342 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
343 dccp_sync_mss(sk, dst_mtu(dst));
344 } /* else let the usual retransmit timer handle it */
345 dst_release(dst);
346 goto out;
347 }
348
349 icmpv6_err_convert(type, code, &err);
350
351 seq = DCCP_SKB_CB(skb)->dccpd_seq;
352 /* Might be for an request_sock */
353 switch (sk->sk_state) {
354 struct request_sock *req, **prev;
355 case DCCP_LISTEN:
356 if (sock_owned_by_user(sk))
357 goto out;
358
359 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
360 &hdr->daddr, &hdr->saddr,
361 inet6_iif(skb));
362 if (req == NULL)
363 goto out;
364
365 /*
366 * ICMPs are not backlogged, hence we cannot get an established
367 * socket here.
368 */
369 BUG_TRAP(req->sk == NULL);
370
371 if (seq != dccp_rsk(req)->dreq_iss) {
372 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
373 goto out;
374 }
375
376 inet_csk_reqsk_queue_drop(sk, req, prev);
377 goto out;
378
379 case DCCP_REQUESTING:
380 case DCCP_RESPOND: /* Cannot happen.
381 It can, it SYNs are crossed. --ANK */
382 if (!sock_owned_by_user(sk)) {
383 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
384 sk->sk_err = err;
385 /*
386 * Wake people up to see the error
387 * (see connect in sock.c)
388 */
389 sk->sk_error_report(sk);
390 dccp_done(sk);
391 } else
392 sk->sk_err_soft = err;
393 goto out;
394 }
395
396 if (!sock_owned_by_user(sk) && np->recverr) {
397 sk->sk_err = err;
398 sk->sk_error_report(sk);
399 } else
400 sk->sk_err_soft = err;
401
402 out:
403 bh_unlock_sock(sk);
404 sock_put(sk);
405 }
406
407
408 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
409 struct dst_entry *dst)
410 {
411 struct inet6_request_sock *ireq6 = inet6_rsk(req);
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct sk_buff *skb;
414 struct ipv6_txoptions *opt = NULL;
415 struct in6_addr *final_p = NULL, final;
416 struct flowi fl;
417 int err = -1;
418
419 memset(&fl, 0, sizeof(fl));
420 fl.proto = IPPROTO_DCCP;
421 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
422 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
423 fl.fl6_flowlabel = 0;
424 fl.oif = ireq6->iif;
425 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
426 fl.fl_ip_sport = inet_sk(sk)->sport;
427 security_req_classify_flow(req, &fl);
428
429 if (dst == NULL) {
430 opt = np->opt;
431 if (opt == NULL &&
432 np->rxopt.bits.osrcrt == 2 &&
433 ireq6->pktopts) {
434 struct sk_buff *pktopts = ireq6->pktopts;
435 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
436
437 if (rxopt->srcrt)
438 opt = ipv6_invert_rthdr(sk,
439 (struct ipv6_rt_hdr *)(pktopts->nh.raw +
440 rxopt->srcrt));
441 }
442
443 if (opt != NULL && opt->srcrt != NULL) {
444 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
445
446 ipv6_addr_copy(&final, &fl.fl6_dst);
447 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
448 final_p = &final;
449 }
450
451 err = ip6_dst_lookup(sk, &dst, &fl);
452 if (err)
453 goto done;
454
455 if (final_p)
456 ipv6_addr_copy(&fl.fl6_dst, final_p);
457
458 err = xfrm_lookup(&dst, &fl, sk, 0);
459 if (err < 0)
460 goto done;
461 }
462
463 skb = dccp_make_response(sk, dst, req);
464 if (skb != NULL) {
465 struct dccp_hdr *dh = dccp_hdr(skb);
466
467 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
468 &ireq6->loc_addr,
469 &ireq6->rmt_addr,
470 csum_partial((char *)dh,
471 skb->len,
472 skb->csum));
473 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
474 err = ip6_xmit(sk, skb, &fl, opt, 0);
475 if (err == NET_XMIT_CN)
476 err = 0;
477 }
478
479 done:
480 if (opt != NULL && opt != np->opt)
481 sock_kfree_s(sk, opt, opt->tot_len);
482 dst_release(dst);
483 return err;
484 }
485
486 static void dccp_v6_reqsk_destructor(struct request_sock *req)
487 {
488 if (inet6_rsk(req)->pktopts != NULL)
489 kfree_skb(inet6_rsk(req)->pktopts);
490 }
491
492 static struct request_sock_ops dccp6_request_sock_ops = {
493 .family = AF_INET6,
494 .obj_size = sizeof(struct dccp6_request_sock),
495 .rtx_syn_ack = dccp_v6_send_response,
496 .send_ack = dccp_v6_reqsk_send_ack,
497 .destructor = dccp_v6_reqsk_destructor,
498 .send_reset = dccp_v6_ctl_send_reset,
499 };
500
501 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
502 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
503 };
504
505 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
506 {
507 struct ipv6_pinfo *np = inet6_sk(sk);
508 struct dccp_hdr *dh = dccp_hdr(skb);
509
510 dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
511 len, IPPROTO_DCCP,
512 csum_partial((char *)dh,
513 dh->dccph_doff << 2,
514 skb->csum));
515 }
516
517 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
518 {
519 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
520 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
521 sizeof(struct dccp_hdr_ext) +
522 sizeof(struct dccp_hdr_reset);
523 struct sk_buff *skb;
524 struct flowi fl;
525 u64 seqno;
526
527 if (rxdh->dccph_type == DCCP_PKT_RESET)
528 return;
529
530 if (!ipv6_unicast_destination(rxskb))
531 return;
532
533 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
534 GFP_ATOMIC);
535 if (skb == NULL)
536 return;
537
538 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
539
540 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
541 dh = dccp_hdr(skb);
542 memset(dh, 0, dccp_hdr_reset_len);
543
544 /* Swap the send and the receive. */
545 dh->dccph_type = DCCP_PKT_RESET;
546 dh->dccph_sport = rxdh->dccph_dport;
547 dh->dccph_dport = rxdh->dccph_sport;
548 dh->dccph_doff = dccp_hdr_reset_len / 4;
549 dh->dccph_x = 1;
550 dccp_hdr_reset(skb)->dccph_reset_code =
551 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
552
553 /* See "8.3.1. Abnormal Termination" in RFC 4340 */
554 seqno = 0;
555 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
556 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
557
558 dccp_hdr_set_seq(dh, seqno);
559 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
560 DCCP_SKB_CB(rxskb)->dccpd_seq);
561
562 memset(&fl, 0, sizeof(fl));
563 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
564 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
565 dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
566 sizeof(*dh), IPPROTO_DCCP,
567 skb->csum);
568 fl.proto = IPPROTO_DCCP;
569 fl.oif = inet6_iif(rxskb);
570 fl.fl_ip_dport = dh->dccph_dport;
571 fl.fl_ip_sport = dh->dccph_sport;
572 security_skb_classify_flow(rxskb, &fl);
573
574 /* sk = NULL, but it is safe for now. RST socket required. */
575 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
576 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
577 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
578 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
579 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
580 return;
581 }
582 }
583
584 kfree_skb(skb);
585 }
586
587 static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
588 struct request_sock *req)
589 {
590 struct flowi fl;
591 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
592 const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
593 sizeof(struct dccp_hdr_ext) +
594 sizeof(struct dccp_hdr_ack_bits);
595 struct sk_buff *skb;
596
597 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
598 GFP_ATOMIC);
599 if (skb == NULL)
600 return;
601
602 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
603
604 skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
605 dh = dccp_hdr(skb);
606 memset(dh, 0, dccp_hdr_ack_len);
607
608 /* Build DCCP header and checksum it. */
609 dh->dccph_type = DCCP_PKT_ACK;
610 dh->dccph_sport = rxdh->dccph_dport;
611 dh->dccph_dport = rxdh->dccph_sport;
612 dh->dccph_doff = dccp_hdr_ack_len / 4;
613 dh->dccph_x = 1;
614
615 dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
616 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
617 DCCP_SKB_CB(rxskb)->dccpd_seq);
618
619 memset(&fl, 0, sizeof(fl));
620 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
621 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
622
623 /* FIXME: calculate checksum, IPv4 also should... */
624
625 fl.proto = IPPROTO_DCCP;
626 fl.oif = inet6_iif(rxskb);
627 fl.fl_ip_dport = dh->dccph_dport;
628 fl.fl_ip_sport = dh->dccph_sport;
629 security_req_classify_flow(req, &fl);
630
631 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
632 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
633 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
634 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
635 return;
636 }
637 }
638
639 kfree_skb(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(inet_twsk(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 dccp_sock dp;
676 struct request_sock *req;
677 struct dccp_request_sock *dreq;
678 struct inet6_request_sock *ireq6;
679 struct ipv6_pinfo *np = inet6_sk(sk);
680 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
681 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
682 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
683
684 if (skb->protocol == htons(ETH_P_IP))
685 return dccp_v4_conn_request(sk, skb);
686
687 if (!ipv6_unicast_destination(skb))
688 goto drop;
689
690 if (dccp_bad_service_code(sk, service)) {
691 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
692 goto drop;
693 }
694 /*
695 * There are no SYN attacks on IPv6, yet...
696 */
697 if (inet_csk_reqsk_queue_is_full(sk))
698 goto drop;
699
700 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
701 goto drop;
702
703 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
704 if (req == NULL)
705 goto drop;
706
707 /* FIXME: process options */
708
709 dccp_openreq_init(req, &dp, skb);
710
711 if (security_inet_conn_request(sk, skb, req))
712 goto drop_and_free;
713
714 ireq6 = inet6_rsk(req);
715 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
716 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
717 req->rcv_wnd = dccp_feat_default_sequence_window;
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 security_sk_classify_flow(sk, &fl);
852
853 if (ip6_dst_lookup(sk, &dst, &fl))
854 goto out;
855
856 if (final_p)
857 ipv6_addr_copy(&fl.fl6_dst, final_p);
858
859 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
860 goto out;
861 }
862
863 newsk = dccp_create_openreq_child(sk, req, skb);
864 if (newsk == NULL)
865 goto out;
866
867 /*
868 * No need to charge this sock to the relevant IPv6 refcnt debug socks
869 * count here, dccp_create_openreq_child now does this for us, see the
870 * comment in that function for the gory details. -acme
871 */
872
873 __ip6_dst_store(newsk, dst, NULL, NULL);
874 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
875 NETIF_F_TSO);
876 newdp6 = (struct dccp6_sock *)newsk;
877 newinet = inet_sk(newsk);
878 newinet->pinet6 = &newdp6->inet6;
879 newdp = dccp_sk(newsk);
880 newnp = inet6_sk(newsk);
881
882 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
883
884 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
885 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
886 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
887 newsk->sk_bound_dev_if = ireq6->iif;
888
889 /* Now IPv6 options...
890
891 First: no IPv4 options.
892 */
893 newinet->opt = NULL;
894
895 /* Clone RX bits */
896 newnp->rxopt.all = np->rxopt.all;
897
898 /* Clone pktoptions received with SYN */
899 newnp->pktoptions = NULL;
900 if (ireq6->pktopts != NULL) {
901 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
902 kfree_skb(ireq6->pktopts);
903 ireq6->pktopts = NULL;
904 if (newnp->pktoptions)
905 skb_set_owner_r(newnp->pktoptions, newsk);
906 }
907 newnp->opt = NULL;
908 newnp->mcast_oif = inet6_iif(skb);
909 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
910
911 /*
912 * Clone native IPv6 options from listening socket (if any)
913 *
914 * Yes, keeping reference count would be much more clever, but we make
915 * one more one thing there: reattach optmem to newsk.
916 */
917 if (opt != NULL) {
918 newnp->opt = ipv6_dup_options(newsk, opt);
919 if (opt != np->opt)
920 sock_kfree_s(sk, opt, opt->tot_len);
921 }
922
923 inet_csk(newsk)->icsk_ext_hdr_len = 0;
924 if (newnp->opt != NULL)
925 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
926 newnp->opt->opt_flen);
927
928 dccp_sync_mss(newsk, dst_mtu(dst));
929
930 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
931
932 __inet6_hash(&dccp_hashinfo, newsk);
933 inet_inherit_port(&dccp_hashinfo, sk, newsk);
934
935 return newsk;
936
937 out_overflow:
938 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
939 out:
940 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
941 if (opt != NULL && opt != np->opt)
942 sock_kfree_s(sk, opt, opt->tot_len);
943 dst_release(dst);
944 return NULL;
945 }
946
947 /* The socket must have it's spinlock held when we get
948 * here.
949 *
950 * We have a potential double-lock case here, so even when
951 * doing backlog processing we use the BH locking scheme.
952 * This is because we cannot sleep with the original spinlock
953 * held.
954 */
955 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
956 {
957 struct ipv6_pinfo *np = inet6_sk(sk);
958 struct sk_buff *opt_skb = NULL;
959
960 /* Imagine: socket is IPv6. IPv4 packet arrives,
961 goes to IPv4 receive handler and backlogged.
962 From backlog it always goes here. Kerboom...
963 Fortunately, dccp_rcv_established and rcv_established
964 handle them correctly, but it is not case with
965 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
966 */
967
968 if (skb->protocol == htons(ETH_P_IP))
969 return dccp_v4_do_rcv(sk, skb);
970
971 if (sk_filter(sk, skb))
972 goto discard;
973
974 /*
975 * socket locking is here for SMP purposes as backlog rcv is currently
976 * called with bh processing disabled.
977 */
978
979 /* Do Stevens' IPV6_PKTOPTIONS.
980
981 Yes, guys, it is the only place in our code, where we
982 may make it not affecting IPv4.
983 The rest of code is protocol independent,
984 and I do not like idea to uglify IPv4.
985
986 Actually, all the idea behind IPV6_PKTOPTIONS
987 looks not very well thought. For now we latch
988 options, received in the last packet, enqueued
989 by tcp. Feel free to propose better solution.
990 --ANK (980728)
991 */
992 if (np->rxopt.all)
993 opt_skb = skb_clone(skb, GFP_ATOMIC);
994
995 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
996 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
997 goto reset;
998 if (opt_skb) {
999 /* This is where we would goto ipv6_pktoptions. */
1000 __kfree_skb(opt_skb);
1001 }
1002 return 0;
1003 }
1004
1005 if (sk->sk_state == DCCP_LISTEN) {
1006 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1007
1008 if (nsk == NULL)
1009 goto discard;
1010 /*
1011 * Queue it on the new socket if the new socket is active,
1012 * otherwise we just shortcircuit this and continue with
1013 * the new socket..
1014 */
1015 if (nsk != sk) {
1016 if (dccp_child_process(sk, nsk, skb))
1017 goto reset;
1018 if (opt_skb != NULL)
1019 __kfree_skb(opt_skb);
1020 return 0;
1021 }
1022 }
1023
1024 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1025 goto reset;
1026 if (opt_skb) {
1027 /* This is where we would goto ipv6_pktoptions. */
1028 __kfree_skb(opt_skb);
1029 }
1030 return 0;
1031
1032 reset:
1033 dccp_v6_ctl_send_reset(skb);
1034 discard:
1035 if (opt_skb != NULL)
1036 __kfree_skb(opt_skb);
1037 kfree_skb(skb);
1038 return 0;
1039 }
1040
1041 static int dccp_v6_rcv(struct sk_buff **pskb)
1042 {
1043 const struct dccp_hdr *dh;
1044 struct sk_buff *skb = *pskb;
1045 struct sock *sk;
1046
1047 /* Step 1: Check header basics: */
1048
1049 if (dccp_invalid_packet(skb))
1050 goto discard_it;
1051
1052 dh = dccp_hdr(skb);
1053
1054 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1055 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1056
1057 if (dccp_packet_without_ack(skb))
1058 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1059 else
1060 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1061
1062 /* Step 2:
1063 * Look up flow ID in table and get corresponding socket */
1064 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1065 dh->dccph_sport,
1066 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1067 inet6_iif(skb));
1068 /*
1069 * Step 2:
1070 * If no socket ...
1071 * Generate Reset(No Connection) unless P.type == Reset
1072 * Drop packet and return
1073 */
1074 if (sk == NULL)
1075 goto no_dccp_socket;
1076
1077 /*
1078 * Step 2:
1079 * ... or S.state == TIMEWAIT,
1080 * Generate Reset(No Connection) unless P.type == Reset
1081 * Drop packet and return
1082 */
1083 if (sk->sk_state == DCCP_TIME_WAIT)
1084 goto do_time_wait;
1085
1086 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1087 goto discard_and_relse;
1088
1089 return sk_receive_skb(sk, skb) ? -1 : 0;
1090
1091 no_dccp_socket:
1092 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1093 goto discard_it;
1094 /*
1095 * Step 2:
1096 * Generate Reset(No Connection) unless P.type == Reset
1097 * Drop packet and return
1098 */
1099 if (dh->dccph_type != DCCP_PKT_RESET) {
1100 DCCP_SKB_CB(skb)->dccpd_reset_code =
1101 DCCP_RESET_CODE_NO_CONNECTION;
1102 dccp_v6_ctl_send_reset(skb);
1103 }
1104 discard_it:
1105
1106 /*
1107 * Discard frame
1108 */
1109
1110 kfree_skb(skb);
1111 return 0;
1112
1113 discard_and_relse:
1114 sock_put(sk);
1115 goto discard_it;
1116
1117 do_time_wait:
1118 inet_twsk_put(inet_twsk(sk));
1119 goto no_dccp_socket;
1120 }
1121
1122 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1123 .queue_xmit = inet6_csk_xmit,
1124 .send_check = dccp_v6_send_check,
1125 .rebuild_header = inet6_sk_rebuild_header,
1126 .conn_request = dccp_v6_conn_request,
1127 .syn_recv_sock = dccp_v6_request_recv_sock,
1128 .net_header_len = sizeof(struct ipv6hdr),
1129 .setsockopt = ipv6_setsockopt,
1130 .getsockopt = ipv6_getsockopt,
1131 .addr2sockaddr = inet6_csk_addr2sockaddr,
1132 .sockaddr_len = sizeof(struct sockaddr_in6),
1133 #ifdef CONFIG_COMPAT
1134 .compat_setsockopt = compat_ipv6_setsockopt,
1135 .compat_getsockopt = compat_ipv6_getsockopt,
1136 #endif
1137 };
1138
1139 /*
1140 * DCCP over IPv4 via INET6 API
1141 */
1142 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1143 .queue_xmit = ip_queue_xmit,
1144 .send_check = dccp_v4_send_check,
1145 .rebuild_header = inet_sk_rebuild_header,
1146 .conn_request = dccp_v6_conn_request,
1147 .syn_recv_sock = dccp_v6_request_recv_sock,
1148 .net_header_len = sizeof(struct iphdr),
1149 .setsockopt = ipv6_setsockopt,
1150 .getsockopt = ipv6_getsockopt,
1151 .addr2sockaddr = inet6_csk_addr2sockaddr,
1152 .sockaddr_len = sizeof(struct sockaddr_in6),
1153 #ifdef CONFIG_COMPAT
1154 .compat_setsockopt = compat_ipv6_setsockopt,
1155 .compat_getsockopt = compat_ipv6_getsockopt,
1156 #endif
1157 };
1158
1159 /* NOTE: A lot of things set to zero explicitly by call to
1160 * sk_alloc() so need not be done here.
1161 */
1162 static int dccp_v6_init_sock(struct sock *sk)
1163 {
1164 static __u8 dccp_v6_ctl_sock_initialized;
1165 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1166
1167 if (err == 0) {
1168 if (unlikely(!dccp_v6_ctl_sock_initialized))
1169 dccp_v6_ctl_sock_initialized = 1;
1170 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1171 }
1172
1173 return err;
1174 }
1175
1176 static int dccp_v6_destroy_sock(struct sock *sk)
1177 {
1178 dccp_destroy_sock(sk);
1179 return inet6_destroy_sock(sk);
1180 }
1181
1182 static struct proto dccp_v6_prot = {
1183 .name = "DCCPv6",
1184 .owner = THIS_MODULE,
1185 .close = dccp_close,
1186 .connect = dccp_v6_connect,
1187 .disconnect = dccp_disconnect,
1188 .ioctl = dccp_ioctl,
1189 .init = dccp_v6_init_sock,
1190 .setsockopt = dccp_setsockopt,
1191 .getsockopt = dccp_getsockopt,
1192 .sendmsg = dccp_sendmsg,
1193 .recvmsg = dccp_recvmsg,
1194 .backlog_rcv = dccp_v6_do_rcv,
1195 .hash = dccp_v6_hash,
1196 .unhash = dccp_unhash,
1197 .accept = inet_csk_accept,
1198 .get_port = dccp_v6_get_port,
1199 .shutdown = dccp_shutdown,
1200 .destroy = dccp_v6_destroy_sock,
1201 .orphan_count = &dccp_orphan_count,
1202 .max_header = MAX_DCCP_HEADER,
1203 .obj_size = sizeof(struct dccp6_sock),
1204 .rsk_prot = &dccp6_request_sock_ops,
1205 .twsk_prot = &dccp6_timewait_sock_ops,
1206 #ifdef CONFIG_COMPAT
1207 .compat_setsockopt = compat_dccp_setsockopt,
1208 .compat_getsockopt = compat_dccp_getsockopt,
1209 #endif
1210 };
1211
1212 static struct inet6_protocol dccp_v6_protocol = {
1213 .handler = dccp_v6_rcv,
1214 .err_handler = dccp_v6_err,
1215 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1216 };
1217
1218 static struct proto_ops inet6_dccp_ops = {
1219 .family = PF_INET6,
1220 .owner = THIS_MODULE,
1221 .release = inet6_release,
1222 .bind = inet6_bind,
1223 .connect = inet_stream_connect,
1224 .socketpair = sock_no_socketpair,
1225 .accept = inet_accept,
1226 .getname = inet6_getname,
1227 .poll = dccp_poll,
1228 .ioctl = inet6_ioctl,
1229 .listen = inet_dccp_listen,
1230 .shutdown = inet_shutdown,
1231 .setsockopt = sock_common_setsockopt,
1232 .getsockopt = sock_common_getsockopt,
1233 .sendmsg = inet_sendmsg,
1234 .recvmsg = sock_common_recvmsg,
1235 .mmap = sock_no_mmap,
1236 .sendpage = sock_no_sendpage,
1237 #ifdef CONFIG_COMPAT
1238 .compat_setsockopt = compat_sock_common_setsockopt,
1239 .compat_getsockopt = compat_sock_common_getsockopt,
1240 #endif
1241 };
1242
1243 static struct inet_protosw dccp_v6_protosw = {
1244 .type = SOCK_DCCP,
1245 .protocol = IPPROTO_DCCP,
1246 .prot = &dccp_v6_prot,
1247 .ops = &inet6_dccp_ops,
1248 .capability = -1,
1249 .flags = INET_PROTOSW_ICSK,
1250 };
1251
1252 static int __init dccp_v6_init(void)
1253 {
1254 int err = proto_register(&dccp_v6_prot, 1);
1255
1256 if (err != 0)
1257 goto out;
1258
1259 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1260 if (err != 0)
1261 goto out_unregister_proto;
1262
1263 inet6_register_protosw(&dccp_v6_protosw);
1264
1265 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1266 SOCK_DCCP, IPPROTO_DCCP);
1267 if (err != 0)
1268 goto out_unregister_protosw;
1269 out:
1270 return err;
1271 out_unregister_protosw:
1272 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1273 inet6_unregister_protosw(&dccp_v6_protosw);
1274 out_unregister_proto:
1275 proto_unregister(&dccp_v6_prot);
1276 goto out;
1277 }
1278
1279 static void __exit dccp_v6_exit(void)
1280 {
1281 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1282 inet6_unregister_protosw(&dccp_v6_protosw);
1283 proto_unregister(&dccp_v6_prot);
1284 }
1285
1286 module_init(dccp_v6_init);
1287 module_exit(dccp_v6_exit);
1288
1289 /*
1290 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1291 * values directly, Also cover the case where the protocol is not specified,
1292 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1293 */
1294 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1295 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1296 MODULE_LICENSE("GPL");
1297 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1298 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
CRIS linux kernel tree