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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[mirror_ubuntu-zesty-kernel.git] / net / dccp / ipv6.c
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 const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39 static const 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 u8 type, u8 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(net, __in6_dev_get(skb->dev),
102 ICMP6_MIB_INERRORS);
103 return;
104 }
105
106 sk = inet6_lookup(net, &dccp_hashinfo,
107 &hdr->daddr, dh->dccph_dport,
108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
109
110 if (sk == NULL) {
111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 ICMP6_MIB_INERRORS);
113 return;
114 }
115
116 if (sk->sk_state == DCCP_TIME_WAIT) {
117 inet_twsk_put(inet_twsk(sk));
118 return;
119 }
120
121 bh_lock_sock(sk);
122 if (sock_owned_by_user(sk))
123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
124
125 if (sk->sk_state == DCCP_CLOSED)
126 goto out;
127
128 dp = dccp_sk(sk);
129 seq = dccp_hdr_seq(dh);
130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 goto out;
134 }
135
136 np = inet6_sk(sk);
137
138 if (type == ICMPV6_PKT_TOOBIG) {
139 struct dst_entry *dst = NULL;
140
141 if (sock_owned_by_user(sk))
142 goto out;
143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
144 goto out;
145
146 /* icmp should have updated the destination cache entry */
147 dst = __sk_dst_check(sk, np->dst_cookie);
148 if (dst == NULL) {
149 struct inet_sock *inet = inet_sk(sk);
150 struct flowi fl;
151
152 /* BUGGG_FUTURE: Again, it is not clear how
153 to handle rthdr case. Ignore this complexity
154 for now.
155 */
156 memset(&fl, 0, sizeof(fl));
157 fl.proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
159 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
160 fl.oif = sk->sk_bound_dev_if;
161 fl.fl_ip_dport = inet->dport;
162 fl.fl_ip_sport = inet->sport;
163 security_sk_classify_flow(sk, &fl);
164
165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err) {
167 sk->sk_err_soft = -err;
168 goto out;
169 }
170
171 err = xfrm_lookup(net, &dst, &fl, sk, 0);
172 if (err < 0) {
173 sk->sk_err_soft = -err;
174 goto out;
175 }
176 } else
177 dst_hold(dst);
178
179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
180 dccp_sync_mss(sk, dst_mtu(dst));
181 } /* else let the usual retransmit timer handle it */
182 dst_release(dst);
183 goto out;
184 }
185
186 icmpv6_err_convert(type, code, &err);
187
188 /* Might be for an request_sock */
189 switch (sk->sk_state) {
190 struct request_sock *req, **prev;
191 case DCCP_LISTEN:
192 if (sock_owned_by_user(sk))
193 goto out;
194
195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
196 &hdr->daddr, &hdr->saddr,
197 inet6_iif(skb));
198 if (req == NULL)
199 goto out;
200
201 /*
202 * ICMPs are not backlogged, hence we cannot get an established
203 * socket here.
204 */
205 WARN_ON(req->sk != NULL);
206
207 if (seq != dccp_rsk(req)->dreq_iss) {
208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
209 goto out;
210 }
211
212 inet_csk_reqsk_queue_drop(sk, req, prev);
213 goto out;
214
215 case DCCP_REQUESTING:
216 case DCCP_RESPOND: /* Cannot happen.
217 It can, it SYNs are crossed. --ANK */
218 if (!sock_owned_by_user(sk)) {
219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220 sk->sk_err = err;
221 /*
222 * Wake people up to see the error
223 * (see connect in sock.c)
224 */
225 sk->sk_error_report(sk);
226 dccp_done(sk);
227 } else
228 sk->sk_err_soft = err;
229 goto out;
230 }
231
232 if (!sock_owned_by_user(sk) && np->recverr) {
233 sk->sk_err = err;
234 sk->sk_error_report(sk);
235 } else
236 sk->sk_err_soft = err;
237
238 out:
239 bh_unlock_sock(sk);
240 sock_put(sk);
241 }
242
243
244 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
245 {
246 struct inet6_request_sock *ireq6 = inet6_rsk(req);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sk_buff *skb;
249 struct ipv6_txoptions *opt = NULL;
250 struct in6_addr *final_p = NULL, final;
251 struct flowi fl;
252 int err = -1;
253 struct dst_entry *dst;
254
255 memset(&fl, 0, sizeof(fl));
256 fl.proto = IPPROTO_DCCP;
257 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
258 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
259 fl.fl6_flowlabel = 0;
260 fl.oif = ireq6->iif;
261 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
262 fl.fl_ip_sport = inet_rsk(req)->loc_port;
263 security_req_classify_flow(req, &fl);
264
265 opt = np->opt;
266
267 if (opt != NULL && opt->srcrt != NULL) {
268 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
269
270 ipv6_addr_copy(&final, &fl.fl6_dst);
271 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
272 final_p = &final;
273 }
274
275 err = ip6_dst_lookup(sk, &dst, &fl);
276 if (err)
277 goto done;
278
279 if (final_p)
280 ipv6_addr_copy(&fl.fl6_dst, final_p);
281
282 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
283 if (err < 0)
284 goto done;
285
286 skb = dccp_make_response(sk, dst, req);
287 if (skb != NULL) {
288 struct dccp_hdr *dh = dccp_hdr(skb);
289
290 dh->dccph_checksum = dccp_v6_csum_finish(skb,
291 &ireq6->loc_addr,
292 &ireq6->rmt_addr);
293 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
294 err = ip6_xmit(sk, skb, &fl, opt, 0);
295 err = net_xmit_eval(err);
296 }
297
298 done:
299 if (opt != NULL && opt != np->opt)
300 sock_kfree_s(sk, opt, opt->tot_len);
301 dst_release(dst);
302 return err;
303 }
304
305 static void dccp_v6_reqsk_destructor(struct request_sock *req)
306 {
307 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
308 if (inet6_rsk(req)->pktopts != NULL)
309 kfree_skb(inet6_rsk(req)->pktopts);
310 }
311
312 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
313 {
314 struct ipv6hdr *rxip6h;
315 struct sk_buff *skb;
316 struct flowi fl;
317 struct net *net = dev_net(skb_dst(rxskb)->dev);
318 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
319 struct dst_entry *dst;
320
321 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
322 return;
323
324 if (!ipv6_unicast_destination(rxskb))
325 return;
326
327 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
328 if (skb == NULL)
329 return;
330
331 rxip6h = ipv6_hdr(rxskb);
332 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
333 &rxip6h->daddr);
334
335 memset(&fl, 0, sizeof(fl));
336 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
337 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
338
339 fl.proto = IPPROTO_DCCP;
340 fl.oif = inet6_iif(rxskb);
341 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
342 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
343 security_skb_classify_flow(rxskb, &fl);
344
345 /* sk = NULL, but it is safe for now. RST socket required. */
346 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
347 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
348 skb_dst_set(skb, dst);
349 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
350 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
351 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
352 return;
353 }
354 }
355
356 kfree_skb(skb);
357 }
358
359 static struct request_sock_ops dccp6_request_sock_ops = {
360 .family = AF_INET6,
361 .obj_size = sizeof(struct dccp6_request_sock),
362 .rtx_syn_ack = dccp_v6_send_response,
363 .send_ack = dccp_reqsk_send_ack,
364 .destructor = dccp_v6_reqsk_destructor,
365 .send_reset = dccp_v6_ctl_send_reset,
366 };
367
368 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
369 {
370 const struct dccp_hdr *dh = dccp_hdr(skb);
371 const struct ipv6hdr *iph = ipv6_hdr(skb);
372 struct sock *nsk;
373 struct request_sock **prev;
374 /* Find possible connection requests. */
375 struct request_sock *req = inet6_csk_search_req(sk, &prev,
376 dh->dccph_sport,
377 &iph->saddr,
378 &iph->daddr,
379 inet6_iif(skb));
380 if (req != NULL)
381 return dccp_check_req(sk, skb, req, prev);
382
383 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
384 &iph->saddr, dh->dccph_sport,
385 &iph->daddr, ntohs(dh->dccph_dport),
386 inet6_iif(skb));
387 if (nsk != NULL) {
388 if (nsk->sk_state != DCCP_TIME_WAIT) {
389 bh_lock_sock(nsk);
390 return nsk;
391 }
392 inet_twsk_put(inet_twsk(nsk));
393 return NULL;
394 }
395
396 return sk;
397 }
398
399 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
400 {
401 struct request_sock *req;
402 struct dccp_request_sock *dreq;
403 struct inet6_request_sock *ireq6;
404 struct ipv6_pinfo *np = inet6_sk(sk);
405 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
406 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
407
408 if (skb->protocol == htons(ETH_P_IP))
409 return dccp_v4_conn_request(sk, skb);
410
411 if (!ipv6_unicast_destination(skb))
412 return 0; /* discard, don't send a reset here */
413
414 if (dccp_bad_service_code(sk, service)) {
415 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
416 goto drop;
417 }
418 /*
419 * There are no SYN attacks on IPv6, yet...
420 */
421 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
422 if (inet_csk_reqsk_queue_is_full(sk))
423 goto drop;
424
425 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
426 goto drop;
427
428 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
429 if (req == NULL)
430 goto drop;
431
432 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
433 goto drop_and_free;
434
435 dreq = dccp_rsk(req);
436 if (dccp_parse_options(sk, dreq, skb))
437 goto drop_and_free;
438
439 if (security_inet_conn_request(sk, skb, req))
440 goto drop_and_free;
441
442 ireq6 = inet6_rsk(req);
443 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
444 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
445
446 if (ipv6_opt_accepted(sk, skb) ||
447 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
448 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
449 atomic_inc(&skb->users);
450 ireq6->pktopts = skb;
451 }
452 ireq6->iif = sk->sk_bound_dev_if;
453
454 /* So that link locals have meaning */
455 if (!sk->sk_bound_dev_if &&
456 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
457 ireq6->iif = inet6_iif(skb);
458
459 /*
460 * Step 3: Process LISTEN state
461 *
462 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
463 *
464 * In fact we defer setting S.GSR, S.SWL, S.SWH to
465 * dccp_create_openreq_child.
466 */
467 dreq->dreq_isr = dcb->dccpd_seq;
468 dreq->dreq_iss = dccp_v6_init_sequence(skb);
469 dreq->dreq_service = service;
470
471 if (dccp_v6_send_response(sk, req))
472 goto drop_and_free;
473
474 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
475 return 0;
476
477 drop_and_free:
478 reqsk_free(req);
479 drop:
480 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
481 return -1;
482 }
483
484 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
485 struct sk_buff *skb,
486 struct request_sock *req,
487 struct dst_entry *dst)
488 {
489 struct inet6_request_sock *ireq6 = inet6_rsk(req);
490 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
491 struct inet_sock *newinet;
492 struct dccp_sock *newdp;
493 struct dccp6_sock *newdp6;
494 struct sock *newsk;
495 struct ipv6_txoptions *opt;
496
497 if (skb->protocol == htons(ETH_P_IP)) {
498 /*
499 * v6 mapped
500 */
501 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
502 if (newsk == NULL)
503 return NULL;
504
505 newdp6 = (struct dccp6_sock *)newsk;
506 newdp = dccp_sk(newsk);
507 newinet = inet_sk(newsk);
508 newinet->pinet6 = &newdp6->inet6;
509 newnp = inet6_sk(newsk);
510
511 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
512
513 ipv6_addr_set_v4mapped(newinet->daddr, &newnp->daddr);
514
515 ipv6_addr_set_v4mapped(newinet->saddr, &newnp->saddr);
516
517 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
518
519 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
520 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
521 newnp->pktoptions = NULL;
522 newnp->opt = NULL;
523 newnp->mcast_oif = inet6_iif(skb);
524 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
525
526 /*
527 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
528 * here, dccp_create_openreq_child now does this for us, see the comment in
529 * that function for the gory details. -acme
530 */
531
532 /* It is tricky place. Until this moment IPv4 tcp
533 worked with IPv6 icsk.icsk_af_ops.
534 Sync it now.
535 */
536 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
537
538 return newsk;
539 }
540
541 opt = np->opt;
542
543 if (sk_acceptq_is_full(sk))
544 goto out_overflow;
545
546 if (dst == NULL) {
547 struct in6_addr *final_p = NULL, final;
548 struct flowi fl;
549
550 memset(&fl, 0, sizeof(fl));
551 fl.proto = IPPROTO_DCCP;
552 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
553 if (opt != NULL && opt->srcrt != NULL) {
554 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
555
556 ipv6_addr_copy(&final, &fl.fl6_dst);
557 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
558 final_p = &final;
559 }
560 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
561 fl.oif = sk->sk_bound_dev_if;
562 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
563 fl.fl_ip_sport = inet_rsk(req)->loc_port;
564 security_sk_classify_flow(sk, &fl);
565
566 if (ip6_dst_lookup(sk, &dst, &fl))
567 goto out;
568
569 if (final_p)
570 ipv6_addr_copy(&fl.fl6_dst, final_p);
571
572 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
573 goto out;
574 }
575
576 newsk = dccp_create_openreq_child(sk, req, skb);
577 if (newsk == NULL)
578 goto out;
579
580 /*
581 * No need to charge this sock to the relevant IPv6 refcnt debug socks
582 * count here, dccp_create_openreq_child now does this for us, see the
583 * comment in that function for the gory details. -acme
584 */
585
586 __ip6_dst_store(newsk, dst, NULL, NULL);
587 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
588 NETIF_F_TSO);
589 newdp6 = (struct dccp6_sock *)newsk;
590 newinet = inet_sk(newsk);
591 newinet->pinet6 = &newdp6->inet6;
592 newdp = dccp_sk(newsk);
593 newnp = inet6_sk(newsk);
594
595 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
596
597 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
598 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
599 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
600 newsk->sk_bound_dev_if = ireq6->iif;
601
602 /* Now IPv6 options...
603
604 First: no IPv4 options.
605 */
606 newinet->opt = NULL;
607
608 /* Clone RX bits */
609 newnp->rxopt.all = np->rxopt.all;
610
611 /* Clone pktoptions received with SYN */
612 newnp->pktoptions = NULL;
613 if (ireq6->pktopts != NULL) {
614 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
615 kfree_skb(ireq6->pktopts);
616 ireq6->pktopts = NULL;
617 if (newnp->pktoptions)
618 skb_set_owner_r(newnp->pktoptions, newsk);
619 }
620 newnp->opt = NULL;
621 newnp->mcast_oif = inet6_iif(skb);
622 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
623
624 /*
625 * Clone native IPv6 options from listening socket (if any)
626 *
627 * Yes, keeping reference count would be much more clever, but we make
628 * one more one thing there: reattach optmem to newsk.
629 */
630 if (opt != NULL) {
631 newnp->opt = ipv6_dup_options(newsk, opt);
632 if (opt != np->opt)
633 sock_kfree_s(sk, opt, opt->tot_len);
634 }
635
636 inet_csk(newsk)->icsk_ext_hdr_len = 0;
637 if (newnp->opt != NULL)
638 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
639 newnp->opt->opt_flen);
640
641 dccp_sync_mss(newsk, dst_mtu(dst));
642
643 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
644
645 __inet6_hash(newsk);
646 __inet_inherit_port(sk, newsk);
647
648 return newsk;
649
650 out_overflow:
651 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
652 out:
653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
654 if (opt != NULL && opt != np->opt)
655 sock_kfree_s(sk, opt, opt->tot_len);
656 dst_release(dst);
657 return NULL;
658 }
659
660 /* The socket must have it's spinlock held when we get
661 * here.
662 *
663 * We have a potential double-lock case here, so even when
664 * doing backlog processing we use the BH locking scheme.
665 * This is because we cannot sleep with the original spinlock
666 * held.
667 */
668 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
669 {
670 struct ipv6_pinfo *np = inet6_sk(sk);
671 struct sk_buff *opt_skb = NULL;
672
673 /* Imagine: socket is IPv6. IPv4 packet arrives,
674 goes to IPv4 receive handler and backlogged.
675 From backlog it always goes here. Kerboom...
676 Fortunately, dccp_rcv_established and rcv_established
677 handle them correctly, but it is not case with
678 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
679 */
680
681 if (skb->protocol == htons(ETH_P_IP))
682 return dccp_v4_do_rcv(sk, skb);
683
684 if (sk_filter(sk, skb))
685 goto discard;
686
687 /*
688 * socket locking is here for SMP purposes as backlog rcv is currently
689 * called with bh processing disabled.
690 */
691
692 /* Do Stevens' IPV6_PKTOPTIONS.
693
694 Yes, guys, it is the only place in our code, where we
695 may make it not affecting IPv4.
696 The rest of code is protocol independent,
697 and I do not like idea to uglify IPv4.
698
699 Actually, all the idea behind IPV6_PKTOPTIONS
700 looks not very well thought. For now we latch
701 options, received in the last packet, enqueued
702 by tcp. Feel free to propose better solution.
703 --ANK (980728)
704 */
705 if (np->rxopt.all)
706 /*
707 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
708 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
709 */
710 opt_skb = skb_clone(skb, GFP_ATOMIC);
711
712 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
713 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
714 goto reset;
715 if (opt_skb) {
716 /* XXX This is where we would goto ipv6_pktoptions. */
717 __kfree_skb(opt_skb);
718 }
719 return 0;
720 }
721
722 /*
723 * Step 3: Process LISTEN state
724 * If S.state == LISTEN,
725 * If P.type == Request or P contains a valid Init Cookie option,
726 * (* Must scan the packet's options to check for Init
727 * Cookies. Only Init Cookies are processed here,
728 * however; other options are processed in Step 8. This
729 * scan need only be performed if the endpoint uses Init
730 * Cookies *)
731 * (* Generate a new socket and switch to that socket *)
732 * Set S := new socket for this port pair
733 * S.state = RESPOND
734 * Choose S.ISS (initial seqno) or set from Init Cookies
735 * Initialize S.GAR := S.ISS
736 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
737 * Continue with S.state == RESPOND
738 * (* A Response packet will be generated in Step 11 *)
739 * Otherwise,
740 * Generate Reset(No Connection) unless P.type == Reset
741 * Drop packet and return
742 *
743 * NOTE: the check for the packet types is done in
744 * dccp_rcv_state_process
745 */
746 if (sk->sk_state == DCCP_LISTEN) {
747 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
748
749 if (nsk == NULL)
750 goto discard;
751 /*
752 * Queue it on the new socket if the new socket is active,
753 * otherwise we just shortcircuit this and continue with
754 * the new socket..
755 */
756 if (nsk != sk) {
757 if (dccp_child_process(sk, nsk, skb))
758 goto reset;
759 if (opt_skb != NULL)
760 __kfree_skb(opt_skb);
761 return 0;
762 }
763 }
764
765 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
766 goto reset;
767 if (opt_skb) {
768 /* XXX This is where we would goto ipv6_pktoptions. */
769 __kfree_skb(opt_skb);
770 }
771 return 0;
772
773 reset:
774 dccp_v6_ctl_send_reset(sk, skb);
775 discard:
776 if (opt_skb != NULL)
777 __kfree_skb(opt_skb);
778 kfree_skb(skb);
779 return 0;
780 }
781
782 static int dccp_v6_rcv(struct sk_buff *skb)
783 {
784 const struct dccp_hdr *dh;
785 struct sock *sk;
786 int min_cov;
787
788 /* Step 1: Check header basics */
789
790 if (dccp_invalid_packet(skb))
791 goto discard_it;
792
793 /* Step 1: If header checksum is incorrect, drop packet and return. */
794 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
795 &ipv6_hdr(skb)->daddr)) {
796 DCCP_WARN("dropped packet with invalid checksum\n");
797 goto discard_it;
798 }
799
800 dh = dccp_hdr(skb);
801
802 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
803 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
804
805 if (dccp_packet_without_ack(skb))
806 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
807 else
808 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
809
810 /* Step 2:
811 * Look up flow ID in table and get corresponding socket */
812 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
813 dh->dccph_sport, dh->dccph_dport);
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_v4mapped(inet->saddr, &np->saddr);
973 ipv6_addr_set_v4mapped(inet->rcv_saddr, &np->rcv_saddr);
974 }
975
976 return err;
977 }
978
979 if (!ipv6_addr_any(&np->rcv_saddr))
980 saddr = &np->rcv_saddr;
981
982 fl.proto = IPPROTO_DCCP;
983 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
984 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
985 fl.oif = sk->sk_bound_dev_if;
986 fl.fl_ip_dport = usin->sin6_port;
987 fl.fl_ip_sport = inet->sport;
988 security_sk_classify_flow(sk, &fl);
989
990 if (np->opt != NULL && np->opt->srcrt != NULL) {
991 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
992
993 ipv6_addr_copy(&final, &fl.fl6_dst);
994 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
995 final_p = &final;
996 }
997
998 err = ip6_dst_lookup(sk, &dst, &fl);
999 if (err)
1000 goto failure;
1001
1002 if (final_p)
1003 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
1005 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1006 if (err < 0) {
1007 if (err == -EREMOTE)
1008 err = ip6_dst_blackhole(sk, &dst, &fl);
1009 if (err < 0)
1010 goto failure;
1011 }
1012
1013 if (saddr == NULL) {
1014 saddr = &fl.fl6_src;
1015 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016 }
1017
1018 /* set the source address */
1019 ipv6_addr_copy(&np->saddr, saddr);
1020 inet->rcv_saddr = LOOPBACK4_IPV6;
1021
1022 __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024 icsk->icsk_ext_hdr_len = 0;
1025 if (np->opt != NULL)
1026 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027 np->opt->opt_nflen);
1028
1029 inet->dport = usin->sin6_port;
1030
1031 dccp_set_state(sk, DCCP_REQUESTING);
1032 err = inet6_hash_connect(&dccp_death_row, sk);
1033 if (err)
1034 goto late_failure;
1035
1036 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037 np->daddr.s6_addr32,
1038 inet->sport, inet->dport);
1039 err = dccp_connect(sk);
1040 if (err)
1041 goto late_failure;
1042
1043 return 0;
1044
1045 late_failure:
1046 dccp_set_state(sk, DCCP_CLOSED);
1047 __sk_dst_reset(sk);
1048 failure:
1049 inet->dport = 0;
1050 sk->sk_route_caps = 0;
1051 return err;
1052 }
1053
1054 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1055 .queue_xmit = inet6_csk_xmit,
1056 .send_check = dccp_v6_send_check,
1057 .rebuild_header = inet6_sk_rebuild_header,
1058 .conn_request = dccp_v6_conn_request,
1059 .syn_recv_sock = dccp_v6_request_recv_sock,
1060 .net_header_len = sizeof(struct ipv6hdr),
1061 .setsockopt = ipv6_setsockopt,
1062 .getsockopt = ipv6_getsockopt,
1063 .addr2sockaddr = inet6_csk_addr2sockaddr,
1064 .sockaddr_len = sizeof(struct sockaddr_in6),
1065 .bind_conflict = inet6_csk_bind_conflict,
1066 #ifdef CONFIG_COMPAT
1067 .compat_setsockopt = compat_ipv6_setsockopt,
1068 .compat_getsockopt = compat_ipv6_getsockopt,
1069 #endif
1070 };
1071
1072 /*
1073 * DCCP over IPv4 via INET6 API
1074 */
1075 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1076 .queue_xmit = ip_queue_xmit,
1077 .send_check = dccp_v4_send_check,
1078 .rebuild_header = inet_sk_rebuild_header,
1079 .conn_request = dccp_v6_conn_request,
1080 .syn_recv_sock = dccp_v6_request_recv_sock,
1081 .net_header_len = sizeof(struct iphdr),
1082 .setsockopt = ipv6_setsockopt,
1083 .getsockopt = ipv6_getsockopt,
1084 .addr2sockaddr = inet6_csk_addr2sockaddr,
1085 .sockaddr_len = sizeof(struct sockaddr_in6),
1086 #ifdef CONFIG_COMPAT
1087 .compat_setsockopt = compat_ipv6_setsockopt,
1088 .compat_getsockopt = compat_ipv6_getsockopt,
1089 #endif
1090 };
1091
1092 /* NOTE: A lot of things set to zero explicitly by call to
1093 * sk_alloc() so need not be done here.
1094 */
1095 static int dccp_v6_init_sock(struct sock *sk)
1096 {
1097 static __u8 dccp_v6_ctl_sock_initialized;
1098 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1099
1100 if (err == 0) {
1101 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102 dccp_v6_ctl_sock_initialized = 1;
1103 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1104 }
1105
1106 return err;
1107 }
1108
1109 static void dccp_v6_destroy_sock(struct sock *sk)
1110 {
1111 dccp_destroy_sock(sk);
1112 inet6_destroy_sock(sk);
1113 }
1114
1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1117 };
1118
1119 static struct proto dccp_v6_prot = {
1120 .name = "DCCPv6",
1121 .owner = THIS_MODULE,
1122 .close = dccp_close,
1123 .connect = dccp_v6_connect,
1124 .disconnect = dccp_disconnect,
1125 .ioctl = dccp_ioctl,
1126 .init = dccp_v6_init_sock,
1127 .setsockopt = dccp_setsockopt,
1128 .getsockopt = dccp_getsockopt,
1129 .sendmsg = dccp_sendmsg,
1130 .recvmsg = dccp_recvmsg,
1131 .backlog_rcv = dccp_v6_do_rcv,
1132 .hash = dccp_v6_hash,
1133 .unhash = inet_unhash,
1134 .accept = inet_csk_accept,
1135 .get_port = inet_csk_get_port,
1136 .shutdown = dccp_shutdown,
1137 .destroy = dccp_v6_destroy_sock,
1138 .orphan_count = &dccp_orphan_count,
1139 .max_header = MAX_DCCP_HEADER,
1140 .obj_size = sizeof(struct dccp6_sock),
1141 .slab_flags = SLAB_DESTROY_BY_RCU,
1142 .rsk_prot = &dccp6_request_sock_ops,
1143 .twsk_prot = &dccp6_timewait_sock_ops,
1144 .h.hashinfo = &dccp_hashinfo,
1145 #ifdef CONFIG_COMPAT
1146 .compat_setsockopt = compat_dccp_setsockopt,
1147 .compat_getsockopt = compat_dccp_getsockopt,
1148 #endif
1149 };
1150
1151 static const struct inet6_protocol dccp_v6_protocol = {
1152 .handler = dccp_v6_rcv,
1153 .err_handler = dccp_v6_err,
1154 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1155 };
1156
1157 static const struct proto_ops inet6_dccp_ops = {
1158 .family = PF_INET6,
1159 .owner = THIS_MODULE,
1160 .release = inet6_release,
1161 .bind = inet6_bind,
1162 .connect = inet_stream_connect,
1163 .socketpair = sock_no_socketpair,
1164 .accept = inet_accept,
1165 .getname = inet6_getname,
1166 .poll = dccp_poll,
1167 .ioctl = inet6_ioctl,
1168 .listen = inet_dccp_listen,
1169 .shutdown = inet_shutdown,
1170 .setsockopt = sock_common_setsockopt,
1171 .getsockopt = sock_common_getsockopt,
1172 .sendmsg = inet_sendmsg,
1173 .recvmsg = sock_common_recvmsg,
1174 .mmap = sock_no_mmap,
1175 .sendpage = sock_no_sendpage,
1176 #ifdef CONFIG_COMPAT
1177 .compat_setsockopt = compat_sock_common_setsockopt,
1178 .compat_getsockopt = compat_sock_common_getsockopt,
1179 #endif
1180 };
1181
1182 static struct inet_protosw dccp_v6_protosw = {
1183 .type = SOCK_DCCP,
1184 .protocol = IPPROTO_DCCP,
1185 .prot = &dccp_v6_prot,
1186 .ops = &inet6_dccp_ops,
1187 .capability = -1,
1188 .flags = INET_PROTOSW_ICSK,
1189 };
1190
1191 static int dccp_v6_init_net(struct net *net)
1192 {
1193 int err;
1194
1195 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1196 SOCK_DCCP, IPPROTO_DCCP, net);
1197 return err;
1198 }
1199
1200 static void dccp_v6_exit_net(struct net *net)
1201 {
1202 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1203 }
1204
1205 static struct pernet_operations dccp_v6_ops = {
1206 .init = dccp_v6_init_net,
1207 .exit = dccp_v6_exit_net,
1208 };
1209
1210 static int __init dccp_v6_init(void)
1211 {
1212 int err = proto_register(&dccp_v6_prot, 1);
1213
1214 if (err != 0)
1215 goto out;
1216
1217 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1218 if (err != 0)
1219 goto out_unregister_proto;
1220
1221 inet6_register_protosw(&dccp_v6_protosw);
1222
1223 err = register_pernet_subsys(&dccp_v6_ops);
1224 if (err != 0)
1225 goto out_destroy_ctl_sock;
1226 out:
1227 return err;
1228
1229 out_destroy_ctl_sock:
1230 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1231 inet6_unregister_protosw(&dccp_v6_protosw);
1232 out_unregister_proto:
1233 proto_unregister(&dccp_v6_prot);
1234 goto out;
1235 }
1236
1237 static void __exit dccp_v6_exit(void)
1238 {
1239 unregister_pernet_subsys(&dccp_v6_ops);
1240 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1241 inet6_unregister_protosw(&dccp_v6_protosw);
1242 proto_unregister(&dccp_v6_prot);
1243 }
1244
1245 module_init(dccp_v6_init);
1246 module_exit(dccp_v6_exit);
1247
1248 /*
1249 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1250 * values directly, Also cover the case where the protocol is not specified,
1251 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1252 */
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1255 MODULE_LICENSE("GPL");
1256 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1257 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
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