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dccp ccid-2: Separate internals of Ack Vectors from option-parsing code
[linux-2.6/mini2440.git] / net / dccp / ipv6.c
blobad6212e00435bbffc2587d018dab1e4bdc06a451
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 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
37
38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
40
41 static void dccp_v6_hash(struct sock *sk)
42 {
43 if (sk->sk_state != DCCP_CLOSED) {
44 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
45 inet_hash(sk);
46 return;
47 }
48 local_bh_disable();
49 __inet6_hash(sk);
50 local_bh_enable();
51 }
52 }
53
54 /* add pseudo-header to DCCP checksum stored in skb->csum */
55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
56 struct in6_addr *saddr,
57 struct in6_addr *daddr)
58 {
59 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
60 }
61
62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
63 struct sk_buff *skb)
64 {
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct dccp_hdr *dh = dccp_hdr(skb);
67
68 dccp_csum_outgoing(skb);
69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
70 }
71
72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
73 __be16 sport, __be16 dport )
74 {
75 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
76 }
77
78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
79 {
80 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
81 ipv6_hdr(skb)->saddr.s6_addr32,
82 dccp_hdr(skb)->dccph_dport,
83 dccp_hdr(skb)->dccph_sport );
84
85 }
86
87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __be32 info)
89 {
90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
92 struct dccp_sock *dp;
93 struct ipv6_pinfo *np;
94 struct sock *sk;
95 int err;
96 __u64 seq;
97 struct net *net = dev_net(skb->dev);
98
99 if (skb->len < offset + sizeof(*dh) ||
100 skb->len < offset + __dccp_basic_hdr_len(dh)) {
101 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
102 return;
103 }
104
105 sk = inet6_lookup(net, &dccp_hashinfo,
106 &hdr->daddr, dh->dccph_dport,
107 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
108
109 if (sk == NULL) {
110 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
111 return;
112 }
113
114 if (sk->sk_state == DCCP_TIME_WAIT) {
115 inet_twsk_put(inet_twsk(sk));
116 return;
117 }
118
119 bh_lock_sock(sk);
120 if (sock_owned_by_user(sk))
121 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
122
123 if (sk->sk_state == DCCP_CLOSED)
124 goto out;
125
126 dp = dccp_sk(sk);
127 seq = dccp_hdr_seq(dh);
128 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
129 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
130 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
131 goto out;
132 }
133
134 np = inet6_sk(sk);
135
136 if (type == ICMPV6_PKT_TOOBIG) {
137 struct dst_entry *dst = NULL;
138
139 if (sock_owned_by_user(sk))
140 goto out;
141 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
142 goto out;
143
144 /* icmp should have updated the destination cache entry */
145 dst = __sk_dst_check(sk, np->dst_cookie);
146 if (dst == NULL) {
147 struct inet_sock *inet = inet_sk(sk);
148 struct flowi fl;
149
150 /* BUGGG_FUTURE: Again, it is not clear how
151 to handle rthdr case. Ignore this complexity
152 for now.
153 */
154 memset(&fl, 0, sizeof(fl));
155 fl.proto = IPPROTO_DCCP;
156 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
157 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
158 fl.oif = sk->sk_bound_dev_if;
159 fl.fl_ip_dport = inet->dport;
160 fl.fl_ip_sport = inet->sport;
161 security_sk_classify_flow(sk, &fl);
162
163 err = ip6_dst_lookup(sk, &dst, &fl);
164 if (err) {
165 sk->sk_err_soft = -err;
166 goto out;
167 }
168
169 err = xfrm_lookup(&dst, &fl, sk, 0);
170 if (err < 0) {
171 sk->sk_err_soft = -err;
172 goto out;
173 }
174 } else
175 dst_hold(dst);
176
177 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
178 dccp_sync_mss(sk, dst_mtu(dst));
179 } /* else let the usual retransmit timer handle it */
180 dst_release(dst);
181 goto out;
182 }
183
184 icmpv6_err_convert(type, code, &err);
185
186 /* Might be for an request_sock */
187 switch (sk->sk_state) {
188 struct request_sock *req, **prev;
189 case DCCP_LISTEN:
190 if (sock_owned_by_user(sk))
191 goto out;
192
193 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
194 &hdr->daddr, &hdr->saddr,
195 inet6_iif(skb));
196 if (req == NULL)
197 goto out;
198
199 /*
200 * ICMPs are not backlogged, hence we cannot get an established
201 * socket here.
202 */
203 WARN_ON(req->sk != NULL);
204
205 if (seq != dccp_rsk(req)->dreq_iss) {
206 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
207 goto out;
208 }
209
210 inet_csk_reqsk_queue_drop(sk, req, prev);
211 goto out;
212
213 case DCCP_REQUESTING:
214 case DCCP_RESPOND: /* Cannot happen.
215 It can, it SYNs are crossed. --ANK */
216 if (!sock_owned_by_user(sk)) {
217 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
218 sk->sk_err = err;
219 /*
220 * Wake people up to see the error
221 * (see connect in sock.c)
222 */
223 sk->sk_error_report(sk);
224 dccp_done(sk);
225 } else
226 sk->sk_err_soft = err;
227 goto out;
228 }
229
230 if (!sock_owned_by_user(sk) && np->recverr) {
231 sk->sk_err = err;
232 sk->sk_error_report(sk);
233 } else
234 sk->sk_err_soft = err;
235
236 out:
237 bh_unlock_sock(sk);
238 sock_put(sk);
239 }
240
241
242 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
243 {
244 struct inet6_request_sock *ireq6 = inet6_rsk(req);
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sk_buff *skb;
247 struct ipv6_txoptions *opt = NULL;
248 struct in6_addr *final_p = NULL, final;
249 struct flowi fl;
250 int err = -1;
251 struct dst_entry *dst;
252
253 memset(&fl, 0, sizeof(fl));
254 fl.proto = IPPROTO_DCCP;
255 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
256 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
257 fl.fl6_flowlabel = 0;
258 fl.oif = ireq6->iif;
259 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
260 fl.fl_ip_sport = inet_sk(sk)->sport;
261 security_req_classify_flow(req, &fl);
262
263 opt = np->opt;
264
265 if (opt != NULL && opt->srcrt != NULL) {
266 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
267
268 ipv6_addr_copy(&final, &fl.fl6_dst);
269 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
270 final_p = &final;
271 }
272
273 err = ip6_dst_lookup(sk, &dst, &fl);
274 if (err)
275 goto done;
276
277 if (final_p)
278 ipv6_addr_copy(&fl.fl6_dst, final_p);
279
280 err = xfrm_lookup(&dst, &fl, sk, 0);
281 if (err < 0)
282 goto done;
283
284 skb = dccp_make_response(sk, dst, req);
285 if (skb != NULL) {
286 struct dccp_hdr *dh = dccp_hdr(skb);
287
288 dh->dccph_checksum = dccp_v6_csum_finish(skb,
289 &ireq6->loc_addr,
290 &ireq6->rmt_addr);
291 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
292 err = ip6_xmit(sk, skb, &fl, opt, 0);
293 err = net_xmit_eval(err);
294 }
295
296 done:
297 if (opt != NULL && opt != np->opt)
298 sock_kfree_s(sk, opt, opt->tot_len);
299 dst_release(dst);
300 return err;
301 }
302
303 static void dccp_v6_reqsk_destructor(struct request_sock *req)
304 {
305 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
306 if (inet6_rsk(req)->pktopts != NULL)
307 kfree_skb(inet6_rsk(req)->pktopts);
308 }
309
310 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
311 {
312 struct ipv6hdr *rxip6h;
313 struct sk_buff *skb;
314 struct flowi fl;
315 struct net *net = dev_net(rxskb->dst->dev);
316 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
317
318 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
319 return;
320
321 if (!ipv6_unicast_destination(rxskb))
322 return;
323
324 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
325 if (skb == NULL)
326 return;
327
328 rxip6h = ipv6_hdr(rxskb);
329 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
330 &rxip6h->daddr);
331
332 memset(&fl, 0, sizeof(fl));
333 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
334 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
335
336 fl.proto = IPPROTO_DCCP;
337 fl.oif = inet6_iif(rxskb);
338 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
339 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
340 security_skb_classify_flow(rxskb, &fl);
341
342 /* sk = NULL, but it is safe for now. RST socket required. */
343 if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
344 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
345 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
346 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
347 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
348 return;
349 }
350 }
351
352 kfree_skb(skb);
353 }
354
355 static struct request_sock_ops dccp6_request_sock_ops = {
356 .family = AF_INET6,
357 .obj_size = sizeof(struct dccp6_request_sock),
358 .rtx_syn_ack = dccp_v6_send_response,
359 .send_ack = dccp_reqsk_send_ack,
360 .destructor = dccp_v6_reqsk_destructor,
361 .send_reset = dccp_v6_ctl_send_reset,
362 };
363
364 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
365 {
366 const struct dccp_hdr *dh = dccp_hdr(skb);
367 const struct ipv6hdr *iph = ipv6_hdr(skb);
368 struct sock *nsk;
369 struct request_sock **prev;
370 /* Find possible connection requests. */
371 struct request_sock *req = inet6_csk_search_req(sk, &prev,
372 dh->dccph_sport,
373 &iph->saddr,
374 &iph->daddr,
375 inet6_iif(skb));
376 if (req != NULL)
377 return dccp_check_req(sk, skb, req, prev);
378
379 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
380 &iph->saddr, dh->dccph_sport,
381 &iph->daddr, ntohs(dh->dccph_dport),
382 inet6_iif(skb));
383 if (nsk != NULL) {
384 if (nsk->sk_state != DCCP_TIME_WAIT) {
385 bh_lock_sock(nsk);
386 return nsk;
387 }
388 inet_twsk_put(inet_twsk(nsk));
389 return NULL;
390 }
391
392 return sk;
393 }
394
395 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
396 {
397 struct request_sock *req;
398 struct dccp_request_sock *dreq;
399 struct inet6_request_sock *ireq6;
400 struct ipv6_pinfo *np = inet6_sk(sk);
401 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
402 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
403
404 if (skb->protocol == htons(ETH_P_IP))
405 return dccp_v4_conn_request(sk, skb);
406
407 if (!ipv6_unicast_destination(skb))
408 return 0; /* discard, don't send a reset here */
409
410 if (dccp_bad_service_code(sk, service)) {
411 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
412 goto drop;
413 }
414 /*
415 * There are no SYN attacks on IPv6, yet...
416 */
417 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
418 if (inet_csk_reqsk_queue_is_full(sk))
419 goto drop;
420
421 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
422 goto drop;
423
424 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
425 if (req == NULL)
426 goto drop;
427
428 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
429 goto drop_and_free;
430
431 dreq = dccp_rsk(req);
432 if (dccp_parse_options(sk, dreq, skb))
433 goto drop_and_free;
434
435 if (security_inet_conn_request(sk, skb, req))
436 goto drop_and_free;
437
438 ireq6 = inet6_rsk(req);
439 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
440 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
441
442 if (ipv6_opt_accepted(sk, skb) ||
443 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
444 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
445 atomic_inc(&skb->users);
446 ireq6->pktopts = skb;
447 }
448 ireq6->iif = sk->sk_bound_dev_if;
449
450 /* So that link locals have meaning */
451 if (!sk->sk_bound_dev_if &&
452 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
453 ireq6->iif = inet6_iif(skb);
454
455 /*
456 * Step 3: Process LISTEN state
457 *
458 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
459 *
460 * In fact we defer setting S.GSR, S.SWL, S.SWH to
461 * dccp_create_openreq_child.
462 */
463 dreq->dreq_isr = dcb->dccpd_seq;
464 dreq->dreq_iss = dccp_v6_init_sequence(skb);
465 dreq->dreq_service = service;
466
467 if (dccp_v6_send_response(sk, req))
468 goto drop_and_free;
469
470 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
471 return 0;
472
473 drop_and_free:
474 reqsk_free(req);
475 drop:
476 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
477 return -1;
478 }
479
480 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
481 struct sk_buff *skb,
482 struct request_sock *req,
483 struct dst_entry *dst)
484 {
485 struct inet6_request_sock *ireq6 = inet6_rsk(req);
486 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
487 struct inet_sock *newinet;
488 struct dccp_sock *newdp;
489 struct dccp6_sock *newdp6;
490 struct sock *newsk;
491 struct ipv6_txoptions *opt;
492
493 if (skb->protocol == htons(ETH_P_IP)) {
494 /*
495 * v6 mapped
496 */
497 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
498 if (newsk == NULL)
499 return NULL;
500
501 newdp6 = (struct dccp6_sock *)newsk;
502 newdp = dccp_sk(newsk);
503 newinet = inet_sk(newsk);
504 newinet->pinet6 = &newdp6->inet6;
505 newnp = inet6_sk(newsk);
506
507 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
508
509 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
510 newinet->daddr);
511
512 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
513 newinet->saddr);
514
515 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
516
517 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
518 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
519 newnp->pktoptions = NULL;
520 newnp->opt = NULL;
521 newnp->mcast_oif = inet6_iif(skb);
522 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
523
524 /*
525 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
526 * here, dccp_create_openreq_child now does this for us, see the comment in
527 * that function for the gory details. -acme
528 */
529
530 /* It is tricky place. Until this moment IPv4 tcp
531 worked with IPv6 icsk.icsk_af_ops.
532 Sync it now.
533 */
534 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
535
536 return newsk;
537 }
538
539 opt = np->opt;
540
541 if (sk_acceptq_is_full(sk))
542 goto out_overflow;
543
544 if (dst == NULL) {
545 struct in6_addr *final_p = NULL, final;
546 struct flowi fl;
547
548 memset(&fl, 0, sizeof(fl));
549 fl.proto = IPPROTO_DCCP;
550 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
551 if (opt != NULL && opt->srcrt != NULL) {
552 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
553
554 ipv6_addr_copy(&final, &fl.fl6_dst);
555 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
556 final_p = &final;
557 }
558 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
559 fl.oif = sk->sk_bound_dev_if;
560 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
561 fl.fl_ip_sport = inet_sk(sk)->sport;
562 security_sk_classify_flow(sk, &fl);
563
564 if (ip6_dst_lookup(sk, &dst, &fl))
565 goto out;
566
567 if (final_p)
568 ipv6_addr_copy(&fl.fl6_dst, final_p);
569
570 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
571 goto out;
572 }
573
574 newsk = dccp_create_openreq_child(sk, req, skb);
575 if (newsk == NULL)
576 goto out;
577
578 /*
579 * No need to charge this sock to the relevant IPv6 refcnt debug socks
580 * count here, dccp_create_openreq_child now does this for us, see the
581 * comment in that function for the gory details. -acme
582 */
583
584 __ip6_dst_store(newsk, dst, NULL, NULL);
585 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
586 NETIF_F_TSO);
587 newdp6 = (struct dccp6_sock *)newsk;
588 newinet = inet_sk(newsk);
589 newinet->pinet6 = &newdp6->inet6;
590 newdp = dccp_sk(newsk);
591 newnp = inet6_sk(newsk);
592
593 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
594
595 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
596 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
597 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
598 newsk->sk_bound_dev_if = ireq6->iif;
599
600 /* Now IPv6 options...
601
602 First: no IPv4 options.
603 */
604 newinet->opt = NULL;
605
606 /* Clone RX bits */
607 newnp->rxopt.all = np->rxopt.all;
608
609 /* Clone pktoptions received with SYN */
610 newnp->pktoptions = NULL;
611 if (ireq6->pktopts != NULL) {
612 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
613 kfree_skb(ireq6->pktopts);
614 ireq6->pktopts = NULL;
615 if (newnp->pktoptions)
616 skb_set_owner_r(newnp->pktoptions, newsk);
617 }
618 newnp->opt = NULL;
619 newnp->mcast_oif = inet6_iif(skb);
620 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
621
622 /*
623 * Clone native IPv6 options from listening socket (if any)
624 *
625 * Yes, keeping reference count would be much more clever, but we make
626 * one more one thing there: reattach optmem to newsk.
627 */
628 if (opt != NULL) {
629 newnp->opt = ipv6_dup_options(newsk, opt);
630 if (opt != np->opt)
631 sock_kfree_s(sk, opt, opt->tot_len);
632 }
633
634 inet_csk(newsk)->icsk_ext_hdr_len = 0;
635 if (newnp->opt != NULL)
636 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
637 newnp->opt->opt_flen);
638
639 dccp_sync_mss(newsk, dst_mtu(dst));
640
641 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
642
643 __inet6_hash(newsk);
644 __inet_inherit_port(sk, newsk);
645
646 return newsk;
647
648 out_overflow:
649 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
650 out:
651 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
652 if (opt != NULL && opt != np->opt)
653 sock_kfree_s(sk, opt, opt->tot_len);
654 dst_release(dst);
655 return NULL;
656 }
657
658 /* The socket must have it's spinlock held when we get
659 * here.
660 *
661 * We have a potential double-lock case here, so even when
662 * doing backlog processing we use the BH locking scheme.
663 * This is because we cannot sleep with the original spinlock
664 * held.
665 */
666 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
667 {
668 struct ipv6_pinfo *np = inet6_sk(sk);
669 struct sk_buff *opt_skb = NULL;
670
671 /* Imagine: socket is IPv6. IPv4 packet arrives,
672 goes to IPv4 receive handler and backlogged.
673 From backlog it always goes here. Kerboom...
674 Fortunately, dccp_rcv_established and rcv_established
675 handle them correctly, but it is not case with
676 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
677 */
678
679 if (skb->protocol == htons(ETH_P_IP))
680 return dccp_v4_do_rcv(sk, skb);
681
682 if (sk_filter(sk, skb))
683 goto discard;
684
685 /*
686 * socket locking is here for SMP purposes as backlog rcv is currently
687 * called with bh processing disabled.
688 */
689
690 /* Do Stevens' IPV6_PKTOPTIONS.
691
692 Yes, guys, it is the only place in our code, where we
693 may make it not affecting IPv4.
694 The rest of code is protocol independent,
695 and I do not like idea to uglify IPv4.
696
697 Actually, all the idea behind IPV6_PKTOPTIONS
698 looks not very well thought. For now we latch
699 options, received in the last packet, enqueued
700 by tcp. Feel free to propose better solution.
701 --ANK (980728)
702 */
703 if (np->rxopt.all)
704 /*
705 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
706 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
707 */
708 opt_skb = skb_clone(skb, GFP_ATOMIC);
709
710 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
711 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
712 goto reset;
713 if (opt_skb) {
714 /* XXX This is where we would goto ipv6_pktoptions. */
715 __kfree_skb(opt_skb);
716 }
717 return 0;
718 }
719
720 /*
721 * Step 3: Process LISTEN state
722 * If S.state == LISTEN,
723 * If P.type == Request or P contains a valid Init Cookie option,
724 * (* Must scan the packet's options to check for Init
725 * Cookies. Only Init Cookies are processed here,
726 * however; other options are processed in Step 8. This
727 * scan need only be performed if the endpoint uses Init
728 * Cookies *)
729 * (* Generate a new socket and switch to that socket *)
730 * Set S := new socket for this port pair
731 * S.state = RESPOND
732 * Choose S.ISS (initial seqno) or set from Init Cookies
733 * Initialize S.GAR := S.ISS
734 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
735 * Continue with S.state == RESPOND
736 * (* A Response packet will be generated in Step 11 *)
737 * Otherwise,
738 * Generate Reset(No Connection) unless P.type == Reset
739 * Drop packet and return
740 *
741 * NOTE: the check for the packet types is done in
742 * dccp_rcv_state_process
743 */
744 if (sk->sk_state == DCCP_LISTEN) {
745 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
746
747 if (nsk == NULL)
748 goto discard;
749 /*
750 * Queue it on the new socket if the new socket is active,
751 * otherwise we just shortcircuit this and continue with
752 * the new socket..
753 */
754 if (nsk != sk) {
755 if (dccp_child_process(sk, nsk, skb))
756 goto reset;
757 if (opt_skb != NULL)
758 __kfree_skb(opt_skb);
759 return 0;
760 }
761 }
762
763 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
764 goto reset;
765 if (opt_skb) {
766 /* XXX This is where we would goto ipv6_pktoptions. */
767 __kfree_skb(opt_skb);
768 }
769 return 0;
770
771 reset:
772 dccp_v6_ctl_send_reset(sk, skb);
773 discard:
774 if (opt_skb != NULL)
775 __kfree_skb(opt_skb);
776 kfree_skb(skb);
777 return 0;
778 }
779
780 static int dccp_v6_rcv(struct sk_buff *skb)
781 {
782 const struct dccp_hdr *dh;
783 struct sock *sk;
784 int min_cov;
785
786 /* Step 1: Check header basics */
787
788 if (dccp_invalid_packet(skb))
789 goto discard_it;
790
791 /* Step 1: If header checksum is incorrect, drop packet and return. */
792 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
793 &ipv6_hdr(skb)->daddr)) {
794 DCCP_WARN("dropped packet with invalid checksum\n");
795 goto discard_it;
796 }
797
798 dh = dccp_hdr(skb);
799
800 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
801 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
802
803 if (dccp_packet_without_ack(skb))
804 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
805 else
806 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
807
808 /* Step 2:
809 * Look up flow ID in table and get corresponding socket */
810 sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
811 &ipv6_hdr(skb)->saddr, dh->dccph_sport,
812 &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
813 inet6_iif(skb));
814 /*
815 * Step 2:
816 * If no socket ...
817 */
818 if (sk == NULL) {
819 dccp_pr_debug("failed to look up flow ID in table and "
820 "get corresponding socket\n");
821 goto no_dccp_socket;
822 }
823
824 /*
825 * Step 2:
826 * ... or S.state == TIMEWAIT,
827 * Generate Reset(No Connection) unless P.type == Reset
828 * Drop packet and return
829 */
830 if (sk->sk_state == DCCP_TIME_WAIT) {
831 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
832 inet_twsk_put(inet_twsk(sk));
833 goto no_dccp_socket;
834 }
835
836 /*
837 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
838 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
839 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
840 */
841 min_cov = dccp_sk(sk)->dccps_pcrlen;
842 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
843 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
844 dh->dccph_cscov, min_cov);
845 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
846 goto discard_and_relse;
847 }
848
849 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
850 goto discard_and_relse;
851
852 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
853
854 no_dccp_socket:
855 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
856 goto discard_it;
857 /*
858 * Step 2:
859 * If no socket ...
860 * Generate Reset(No Connection) unless P.type == Reset
861 * Drop packet and return
862 */
863 if (dh->dccph_type != DCCP_PKT_RESET) {
864 DCCP_SKB_CB(skb)->dccpd_reset_code =
865 DCCP_RESET_CODE_NO_CONNECTION;
866 dccp_v6_ctl_send_reset(sk, skb);
867 }
868
869 discard_it:
870 kfree_skb(skb);
871 return 0;
872
873 discard_and_relse:
874 sock_put(sk);
875 goto discard_it;
876 }
877
878 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
879 int addr_len)
880 {
881 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
882 struct inet_connection_sock *icsk = inet_csk(sk);
883 struct inet_sock *inet = inet_sk(sk);
884 struct ipv6_pinfo *np = inet6_sk(sk);
885 struct dccp_sock *dp = dccp_sk(sk);
886 struct in6_addr *saddr = NULL, *final_p = NULL, final;
887 struct flowi fl;
888 struct dst_entry *dst;
889 int addr_type;
890 int err;
891
892 dp->dccps_role = DCCP_ROLE_CLIENT;
893
894 if (addr_len < SIN6_LEN_RFC2133)
895 return -EINVAL;
896
897 if (usin->sin6_family != AF_INET6)
898 return -EAFNOSUPPORT;
899
900 memset(&fl, 0, sizeof(fl));
901
902 if (np->sndflow) {
903 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
904 IP6_ECN_flow_init(fl.fl6_flowlabel);
905 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
906 struct ip6_flowlabel *flowlabel;
907 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
908 if (flowlabel == NULL)
909 return -EINVAL;
910 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
911 fl6_sock_release(flowlabel);
912 }
913 }
914 /*
915 * connect() to INADDR_ANY means loopback (BSD'ism).
916 */
917 if (ipv6_addr_any(&usin->sin6_addr))
918 usin->sin6_addr.s6_addr[15] = 1;
919
920 addr_type = ipv6_addr_type(&usin->sin6_addr);
921
922 if (addr_type & IPV6_ADDR_MULTICAST)
923 return -ENETUNREACH;
924
925 if (addr_type & IPV6_ADDR_LINKLOCAL) {
926 if (addr_len >= sizeof(struct sockaddr_in6) &&
927 usin->sin6_scope_id) {
928 /* If interface is set while binding, indices
929 * must coincide.
930 */
931 if (sk->sk_bound_dev_if &&
932 sk->sk_bound_dev_if != usin->sin6_scope_id)
933 return -EINVAL;
934
935 sk->sk_bound_dev_if = usin->sin6_scope_id;
936 }
937
938 /* Connect to link-local address requires an interface */
939 if (!sk->sk_bound_dev_if)
940 return -EINVAL;
941 }
942
943 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
944 np->flow_label = fl.fl6_flowlabel;
945
946 /*
947 * DCCP over IPv4
948 */
949 if (addr_type == IPV6_ADDR_MAPPED) {
950 u32 exthdrlen = icsk->icsk_ext_hdr_len;
951 struct sockaddr_in sin;
952
953 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
954
955 if (__ipv6_only_sock(sk))
956 return -ENETUNREACH;
957
958 sin.sin_family = AF_INET;
959 sin.sin_port = usin->sin6_port;
960 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
961
962 icsk->icsk_af_ops = &dccp_ipv6_mapped;
963 sk->sk_backlog_rcv = dccp_v4_do_rcv;
964
965 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
966 if (err) {
967 icsk->icsk_ext_hdr_len = exthdrlen;
968 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
969 sk->sk_backlog_rcv = dccp_v6_do_rcv;
970 goto failure;
971 } else {
972 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
973 inet->saddr);
974 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
975 inet->rcv_saddr);
976 }
977
978 return err;
979 }
980
981 if (!ipv6_addr_any(&np->rcv_saddr))
982 saddr = &np->rcv_saddr;
983
984 fl.proto = IPPROTO_DCCP;
985 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
986 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
987 fl.oif = sk->sk_bound_dev_if;
988 fl.fl_ip_dport = usin->sin6_port;
989 fl.fl_ip_sport = inet->sport;
990 security_sk_classify_flow(sk, &fl);
991
992 if (np->opt != NULL && np->opt->srcrt != NULL) {
993 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
994
995 ipv6_addr_copy(&final, &fl.fl6_dst);
996 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
997 final_p = &final;
998 }
999
1000 err = ip6_dst_lookup(sk, &dst, &fl);
1001 if (err)
1002 goto failure;
1003
1004 if (final_p)
1005 ipv6_addr_copy(&fl.fl6_dst, final_p);
1006
1007 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1008 if (err < 0) {
1009 if (err == -EREMOTE)
1010 err = ip6_dst_blackhole(sk, &dst, &fl);
1011 if (err < 0)
1012 goto failure;
1013 }
1014
1015 if (saddr == NULL) {
1016 saddr = &fl.fl6_src;
1017 ipv6_addr_copy(&np->rcv_saddr, saddr);
1018 }
1019
1020 /* set the source address */
1021 ipv6_addr_copy(&np->saddr, saddr);
1022 inet->rcv_saddr = LOOPBACK4_IPV6;
1023
1024 __ip6_dst_store(sk, dst, NULL, NULL);
1025
1026 icsk->icsk_ext_hdr_len = 0;
1027 if (np->opt != NULL)
1028 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1029 np->opt->opt_nflen);
1030
1031 inet->dport = usin->sin6_port;
1032
1033 dccp_set_state(sk, DCCP_REQUESTING);
1034 err = inet6_hash_connect(&dccp_death_row, sk);
1035 if (err)
1036 goto late_failure;
1037
1038 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1039 np->daddr.s6_addr32,
1040 inet->sport, inet->dport);
1041 err = dccp_connect(sk);
1042 if (err)
1043 goto late_failure;
1044
1045 return 0;
1046
1047 late_failure:
1048 dccp_set_state(sk, DCCP_CLOSED);
1049 __sk_dst_reset(sk);
1050 failure:
1051 inet->dport = 0;
1052 sk->sk_route_caps = 0;
1053 return err;
1054 }
1055
1056 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1057 .queue_xmit = inet6_csk_xmit,
1058 .send_check = dccp_v6_send_check,
1059 .rebuild_header = inet6_sk_rebuild_header,
1060 .conn_request = dccp_v6_conn_request,
1061 .syn_recv_sock = dccp_v6_request_recv_sock,
1062 .net_header_len = sizeof(struct ipv6hdr),
1063 .setsockopt = ipv6_setsockopt,
1064 .getsockopt = ipv6_getsockopt,
1065 .addr2sockaddr = inet6_csk_addr2sockaddr,
1066 .sockaddr_len = sizeof(struct sockaddr_in6),
1067 .bind_conflict = inet6_csk_bind_conflict,
1068 #ifdef CONFIG_COMPAT
1069 .compat_setsockopt = compat_ipv6_setsockopt,
1070 .compat_getsockopt = compat_ipv6_getsockopt,
1071 #endif
1072 };
1073
1074 /*
1075 * DCCP over IPv4 via INET6 API
1076 */
1077 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1078 .queue_xmit = ip_queue_xmit,
1079 .send_check = dccp_v4_send_check,
1080 .rebuild_header = inet_sk_rebuild_header,
1081 .conn_request = dccp_v6_conn_request,
1082 .syn_recv_sock = dccp_v6_request_recv_sock,
1083 .net_header_len = sizeof(struct iphdr),
1084 .setsockopt = ipv6_setsockopt,
1085 .getsockopt = ipv6_getsockopt,
1086 .addr2sockaddr = inet6_csk_addr2sockaddr,
1087 .sockaddr_len = sizeof(struct sockaddr_in6),
1088 #ifdef CONFIG_COMPAT
1089 .compat_setsockopt = compat_ipv6_setsockopt,
1090 .compat_getsockopt = compat_ipv6_getsockopt,
1091 #endif
1092 };
1093
1094 /* NOTE: A lot of things set to zero explicitly by call to
1095 * sk_alloc() so need not be done here.
1096 */
1097 static int dccp_v6_init_sock(struct sock *sk)
1098 {
1099 static __u8 dccp_v6_ctl_sock_initialized;
1100 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1101
1102 if (err == 0) {
1103 if (unlikely(!dccp_v6_ctl_sock_initialized))
1104 dccp_v6_ctl_sock_initialized = 1;
1105 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1106 }
1107
1108 return err;
1109 }
1110
1111 static void dccp_v6_destroy_sock(struct sock *sk)
1112 {
1113 dccp_destroy_sock(sk);
1114 inet6_destroy_sock(sk);
1115 }
1116
1117 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1118 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1119 };
1120
1121 static struct proto dccp_v6_prot = {
1122 .name = "DCCPv6",
1123 .owner = THIS_MODULE,
1124 .close = dccp_close,
1125 .connect = dccp_v6_connect,
1126 .disconnect = dccp_disconnect,
1127 .ioctl = dccp_ioctl,
1128 .init = dccp_v6_init_sock,
1129 .setsockopt = dccp_setsockopt,
1130 .getsockopt = dccp_getsockopt,
1131 .sendmsg = dccp_sendmsg,
1132 .recvmsg = dccp_recvmsg,
1133 .backlog_rcv = dccp_v6_do_rcv,
1134 .hash = dccp_v6_hash,
1135 .unhash = inet_unhash,
1136 .accept = inet_csk_accept,
1137 .get_port = inet_csk_get_port,
1138 .shutdown = dccp_shutdown,
1139 .destroy = dccp_v6_destroy_sock,
1140 .orphan_count = &dccp_orphan_count,
1141 .max_header = MAX_DCCP_HEADER,
1142 .obj_size = sizeof(struct dccp6_sock),
1143 .rsk_prot = &dccp6_request_sock_ops,
1144 .twsk_prot = &dccp6_timewait_sock_ops,
1145 .h.hashinfo = &dccp_hashinfo,
1146 #ifdef CONFIG_COMPAT
1147 .compat_setsockopt = compat_dccp_setsockopt,
1148 .compat_getsockopt = compat_dccp_getsockopt,
1149 #endif
1150 };
1151
1152 static struct inet6_protocol dccp_v6_protocol = {
1153 .handler = dccp_v6_rcv,
1154 .err_handler = dccp_v6_err,
1155 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1156 };
1157
1158 static struct proto_ops inet6_dccp_ops = {
1159 .family = PF_INET6,
1160 .owner = THIS_MODULE,
1161 .release = inet6_release,
1162 .bind = inet6_bind,
1163 .connect = inet_stream_connect,
1164 .socketpair = sock_no_socketpair,
1165 .accept = inet_accept,
1166 .getname = inet6_getname,
1167 .poll = dccp_poll,
1168 .ioctl = inet6_ioctl,
1169 .listen = inet_dccp_listen,
1170 .shutdown = inet_shutdown,
1171 .setsockopt = sock_common_setsockopt,
1172 .getsockopt = sock_common_getsockopt,
1173 .sendmsg = inet_sendmsg,
1174 .recvmsg = sock_common_recvmsg,
1175 .mmap = sock_no_mmap,
1176 .sendpage = sock_no_sendpage,
1177 #ifdef CONFIG_COMPAT
1178 .compat_setsockopt = compat_sock_common_setsockopt,
1179 .compat_getsockopt = compat_sock_common_getsockopt,
1180 #endif
1181 };
1182
1183 static struct inet_protosw dccp_v6_protosw = {
1184 .type = SOCK_DCCP,
1185 .protocol = IPPROTO_DCCP,
1186 .prot = &dccp_v6_prot,
1187 .ops = &inet6_dccp_ops,
1188 .capability = -1,
1189 .flags = INET_PROTOSW_ICSK,
1190 };
1191
1192 static int dccp_v6_init_net(struct net *net)
1193 {
1194 int err;
1195
1196 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1197 SOCK_DCCP, IPPROTO_DCCP, net);
1198 return err;
1199 }
1200
1201 static void dccp_v6_exit_net(struct net *net)
1202 {
1203 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1204 }
1205
1206 static struct pernet_operations dccp_v6_ops = {
1207 .init = dccp_v6_init_net,
1208 .exit = dccp_v6_exit_net,
1209 };
1210
1211 static int __init dccp_v6_init(void)
1212 {
1213 int err = proto_register(&dccp_v6_prot, 1);
1214
1215 if (err != 0)
1216 goto out;
1217
1218 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1219 if (err != 0)
1220 goto out_unregister_proto;
1221
1222 inet6_register_protosw(&dccp_v6_protosw);
1223
1224 err = register_pernet_subsys(&dccp_v6_ops);
1225 if (err != 0)
1226 goto out_destroy_ctl_sock;
1227 out:
1228 return err;
1229
1230 out_destroy_ctl_sock:
1231 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1232 inet6_unregister_protosw(&dccp_v6_protosw);
1233 out_unregister_proto:
1234 proto_unregister(&dccp_v6_prot);
1235 goto out;
1236 }
1237
1238 static void __exit dccp_v6_exit(void)
1239 {
1240 unregister_pernet_subsys(&dccp_v6_ops);
1241 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1242 inet6_unregister_protosw(&dccp_v6_protosw);
1243 proto_unregister(&dccp_v6_prot);
1244 }
1245
1246 module_init(dccp_v6_init);
1247 module_exit(dccp_v6_exit);
1248
1249 /*
1250 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1251 * values directly, Also cover the case where the protocol is not specified,
1252 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1253 */
1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1255 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1256 MODULE_LICENSE("GPL");
1257 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1258 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Support for the Chinese Samsung S3C2440 based development boards