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[mirror_ubuntu-bionic-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 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
38
39 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
41
42 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
43 {
44 return inet_csk_get_port(&dccp_hashinfo, sk, snum,
45 inet6_csk_bind_conflict);
46 }
47
48 static void dccp_v6_hash(struct sock *sk)
49 {
50 if (sk->sk_state != DCCP_CLOSED) {
51 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
52 dccp_hash(sk);
53 return;
54 }
55 local_bh_disable();
56 __inet6_hash(&dccp_hashinfo, sk);
57 local_bh_enable();
58 }
59 }
60
61 /* add pseudo-header to DCCP checksum stored in skb->csum */
62 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
63 struct in6_addr *saddr,
64 struct in6_addr *daddr)
65 {
66 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
67 }
68
69 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
70 struct sk_buff *skb)
71 {
72 struct ipv6_pinfo *np = inet6_sk(sk);
73 struct dccp_hdr *dh = dccp_hdr(skb);
74
75 dccp_csum_outgoing(skb);
76 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
77 }
78
79 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
80 __be16 sport, __be16 dport )
81 {
82 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
83 }
84
85 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
86 {
87 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
88 ipv6_hdr(skb)->saddr.s6_addr32,
89 dccp_hdr(skb)->dccph_dport,
90 dccp_hdr(skb)->dccph_sport );
91
92 }
93
94 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
95 int type, int code, int offset, __be32 info)
96 {
97 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
98 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
99 struct ipv6_pinfo *np;
100 struct sock *sk;
101 int err;
102 __u64 seq;
103
104 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
105 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
106
107 if (sk == NULL) {
108 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
109 return;
110 }
111
112 if (sk->sk_state == DCCP_TIME_WAIT) {
113 inet_twsk_put(inet_twsk(sk));
114 return;
115 }
116
117 bh_lock_sock(sk);
118 if (sock_owned_by_user(sk))
119 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
120
121 if (sk->sk_state == DCCP_CLOSED)
122 goto out;
123
124 np = inet6_sk(sk);
125
126 if (type == ICMPV6_PKT_TOOBIG) {
127 struct dst_entry *dst = NULL;
128
129 if (sock_owned_by_user(sk))
130 goto out;
131 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
132 goto out;
133
134 /* icmp should have updated the destination cache entry */
135 dst = __sk_dst_check(sk, np->dst_cookie);
136 if (dst == NULL) {
137 struct inet_sock *inet = inet_sk(sk);
138 struct flowi fl;
139
140 /* BUGGG_FUTURE: Again, it is not clear how
141 to handle rthdr case. Ignore this complexity
142 for now.
143 */
144 memset(&fl, 0, sizeof(fl));
145 fl.proto = IPPROTO_DCCP;
146 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
147 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
148 fl.oif = sk->sk_bound_dev_if;
149 fl.fl_ip_dport = inet->dport;
150 fl.fl_ip_sport = inet->sport;
151 security_sk_classify_flow(sk, &fl);
152
153 err = ip6_dst_lookup(sk, &dst, &fl);
154 if (err) {
155 sk->sk_err_soft = -err;
156 goto out;
157 }
158
159 err = xfrm_lookup(&dst, &fl, sk, 0);
160 if (err < 0) {
161 sk->sk_err_soft = -err;
162 goto out;
163 }
164 } else
165 dst_hold(dst);
166
167 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
168 dccp_sync_mss(sk, dst_mtu(dst));
169 } /* else let the usual retransmit timer handle it */
170 dst_release(dst);
171 goto out;
172 }
173
174 icmpv6_err_convert(type, code, &err);
175
176 seq = DCCP_SKB_CB(skb)->dccpd_seq;
177 /* Might be for an request_sock */
178 switch (sk->sk_state) {
179 struct request_sock *req, **prev;
180 case DCCP_LISTEN:
181 if (sock_owned_by_user(sk))
182 goto out;
183
184 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
185 &hdr->daddr, &hdr->saddr,
186 inet6_iif(skb));
187 if (req == NULL)
188 goto out;
189
190 /*
191 * ICMPs are not backlogged, hence we cannot get an established
192 * socket here.
193 */
194 BUG_TRAP(req->sk == NULL);
195
196 if (seq != dccp_rsk(req)->dreq_iss) {
197 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
198 goto out;
199 }
200
201 inet_csk_reqsk_queue_drop(sk, req, prev);
202 goto out;
203
204 case DCCP_REQUESTING:
205 case DCCP_RESPOND: /* Cannot happen.
206 It can, it SYNs are crossed. --ANK */
207 if (!sock_owned_by_user(sk)) {
208 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
209 sk->sk_err = err;
210 /*
211 * Wake people up to see the error
212 * (see connect in sock.c)
213 */
214 sk->sk_error_report(sk);
215 dccp_done(sk);
216 } else
217 sk->sk_err_soft = err;
218 goto out;
219 }
220
221 if (!sock_owned_by_user(sk) && np->recverr) {
222 sk->sk_err = err;
223 sk->sk_error_report(sk);
224 } else
225 sk->sk_err_soft = err;
226
227 out:
228 bh_unlock_sock(sk);
229 sock_put(sk);
230 }
231
232
233 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
234 struct dst_entry *dst)
235 {
236 struct inet6_request_sock *ireq6 = inet6_rsk(req);
237 struct ipv6_pinfo *np = inet6_sk(sk);
238 struct sk_buff *skb;
239 struct ipv6_txoptions *opt = NULL;
240 struct in6_addr *final_p = NULL, final;
241 struct flowi fl;
242 int err = -1;
243
244 memset(&fl, 0, sizeof(fl));
245 fl.proto = IPPROTO_DCCP;
246 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
247 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
248 fl.fl6_flowlabel = 0;
249 fl.oif = ireq6->iif;
250 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
251 fl.fl_ip_sport = inet_sk(sk)->sport;
252 security_req_classify_flow(req, &fl);
253
254 if (dst == NULL) {
255 opt = np->opt;
256
257 if (opt != NULL && opt->srcrt != NULL) {
258 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
259
260 ipv6_addr_copy(&final, &fl.fl6_dst);
261 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
262 final_p = &final;
263 }
264
265 err = ip6_dst_lookup(sk, &dst, &fl);
266 if (err)
267 goto done;
268
269 if (final_p)
270 ipv6_addr_copy(&fl.fl6_dst, final_p);
271
272 err = xfrm_lookup(&dst, &fl, sk, 0);
273 if (err < 0)
274 goto done;
275 }
276
277 skb = dccp_make_response(sk, dst, req);
278 if (skb != NULL) {
279 struct dccp_hdr *dh = dccp_hdr(skb);
280
281 dh->dccph_checksum = dccp_v6_csum_finish(skb,
282 &ireq6->loc_addr,
283 &ireq6->rmt_addr);
284 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
285 err = ip6_xmit(sk, skb, &fl, opt, 0);
286 err = net_xmit_eval(err);
287 }
288
289 done:
290 if (opt != NULL && opt != np->opt)
291 sock_kfree_s(sk, opt, opt->tot_len);
292 dst_release(dst);
293 return err;
294 }
295
296 static void dccp_v6_reqsk_destructor(struct request_sock *req)
297 {
298 if (inet6_rsk(req)->pktopts != NULL)
299 kfree_skb(inet6_rsk(req)->pktopts);
300 }
301
302 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
303 {
304 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
305 struct ipv6hdr *rxip6h;
306 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
307 sizeof(struct dccp_hdr_ext) +
308 sizeof(struct dccp_hdr_reset);
309 struct sk_buff *skb;
310 struct flowi fl;
311 u64 seqno = 0;
312
313 if (rxdh->dccph_type == DCCP_PKT_RESET)
314 return;
315
316 if (!ipv6_unicast_destination(rxskb))
317 return;
318
319 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
320 GFP_ATOMIC);
321 if (skb == NULL)
322 return;
323
324 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
325
326 dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
327
328 /* Swap the send and the receive. */
329 dh->dccph_type = DCCP_PKT_RESET;
330 dh->dccph_sport = rxdh->dccph_dport;
331 dh->dccph_dport = rxdh->dccph_sport;
332 dh->dccph_doff = dccp_hdr_reset_len / 4;
333 dh->dccph_x = 1;
334 dccp_hdr_reset(skb)->dccph_reset_code =
335 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
336
337 /* See "8.3.1. Abnormal Termination" in RFC 4340 */
338 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
339 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
340
341 dccp_hdr_set_seq(dh, seqno);
342 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
343
344 dccp_csum_outgoing(skb);
345 rxip6h = ipv6_hdr(rxskb);
346 dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
347 &rxip6h->daddr);
348
349 memset(&fl, 0, sizeof(fl));
350 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
351 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
352
353 fl.proto = IPPROTO_DCCP;
354 fl.oif = inet6_iif(rxskb);
355 fl.fl_ip_dport = dh->dccph_dport;
356 fl.fl_ip_sport = dh->dccph_sport;
357 security_skb_classify_flow(rxskb, &fl);
358
359 /* sk = NULL, but it is safe for now. RST socket required. */
360 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
361 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
362 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
363 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
364 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
365 return;
366 }
367 }
368
369 kfree_skb(skb);
370 }
371
372 static struct request_sock_ops dccp6_request_sock_ops = {
373 .family = AF_INET6,
374 .obj_size = sizeof(struct dccp6_request_sock),
375 .rtx_syn_ack = dccp_v6_send_response,
376 .send_ack = dccp_reqsk_send_ack,
377 .destructor = dccp_v6_reqsk_destructor,
378 .send_reset = dccp_v6_ctl_send_reset,
379 };
380
381 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
382 {
383 const struct dccp_hdr *dh = dccp_hdr(skb);
384 const struct ipv6hdr *iph = ipv6_hdr(skb);
385 struct sock *nsk;
386 struct request_sock **prev;
387 /* Find possible connection requests. */
388 struct request_sock *req = inet6_csk_search_req(sk, &prev,
389 dh->dccph_sport,
390 &iph->saddr,
391 &iph->daddr,
392 inet6_iif(skb));
393 if (req != NULL)
394 return dccp_check_req(sk, skb, req, prev);
395
396 nsk = __inet6_lookup_established(&dccp_hashinfo,
397 &iph->saddr, dh->dccph_sport,
398 &iph->daddr, ntohs(dh->dccph_dport),
399 inet6_iif(skb));
400 if (nsk != NULL) {
401 if (nsk->sk_state != DCCP_TIME_WAIT) {
402 bh_lock_sock(nsk);
403 return nsk;
404 }
405 inet_twsk_put(inet_twsk(nsk));
406 return NULL;
407 }
408
409 return sk;
410 }
411
412 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
413 {
414 struct request_sock *req;
415 struct dccp_request_sock *dreq;
416 struct inet6_request_sock *ireq6;
417 struct ipv6_pinfo *np = inet6_sk(sk);
418 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
419 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
420 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
421
422 if (skb->protocol == htons(ETH_P_IP))
423 return dccp_v4_conn_request(sk, skb);
424
425 if (!ipv6_unicast_destination(skb))
426 goto drop;
427
428 if (dccp_bad_service_code(sk, service)) {
429 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
430 goto drop;
431 }
432 /*
433 * There are no SYN attacks on IPv6, yet...
434 */
435 if (inet_csk_reqsk_queue_is_full(sk))
436 goto drop;
437
438 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
439 goto drop;
440
441 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
442 if (req == NULL)
443 goto drop;
444
445 if (dccp_parse_options(sk, skb))
446 goto drop_and_free;
447
448 dccp_reqsk_init(req, skb);
449
450 if (security_inet_conn_request(sk, skb, req))
451 goto drop_and_free;
452
453 ireq6 = inet6_rsk(req);
454 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
455 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
456 ireq6->pktopts = NULL;
457
458 if (ipv6_opt_accepted(sk, skb) ||
459 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
460 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
461 atomic_inc(&skb->users);
462 ireq6->pktopts = skb;
463 }
464 ireq6->iif = sk->sk_bound_dev_if;
465
466 /* So that link locals have meaning */
467 if (!sk->sk_bound_dev_if &&
468 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
469 ireq6->iif = inet6_iif(skb);
470
471 /*
472 * Step 3: Process LISTEN state
473 *
474 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
475 *
476 * In fact we defer setting S.GSR, S.SWL, S.SWH to
477 * dccp_create_openreq_child.
478 */
479 dreq = dccp_rsk(req);
480 dreq->dreq_isr = dcb->dccpd_seq;
481 dreq->dreq_iss = dccp_v6_init_sequence(skb);
482 dreq->dreq_service = service;
483
484 if (dccp_v6_send_response(sk, req, NULL))
485 goto drop_and_free;
486
487 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
488 return 0;
489
490 drop_and_free:
491 reqsk_free(req);
492 drop:
493 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
494 dcb->dccpd_reset_code = reset_code;
495 return -1;
496 }
497
498 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
499 struct sk_buff *skb,
500 struct request_sock *req,
501 struct dst_entry *dst)
502 {
503 struct inet6_request_sock *ireq6 = inet6_rsk(req);
504 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
505 struct inet_sock *newinet;
506 struct dccp_sock *newdp;
507 struct dccp6_sock *newdp6;
508 struct sock *newsk;
509 struct ipv6_txoptions *opt;
510
511 if (skb->protocol == htons(ETH_P_IP)) {
512 /*
513 * v6 mapped
514 */
515 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
516 if (newsk == NULL)
517 return NULL;
518
519 newdp6 = (struct dccp6_sock *)newsk;
520 newdp = dccp_sk(newsk);
521 newinet = inet_sk(newsk);
522 newinet->pinet6 = &newdp6->inet6;
523 newnp = inet6_sk(newsk);
524
525 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
526
527 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
528 newinet->daddr);
529
530 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
531 newinet->saddr);
532
533 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
534
535 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
536 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
537 newnp->pktoptions = NULL;
538 newnp->opt = NULL;
539 newnp->mcast_oif = inet6_iif(skb);
540 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
541
542 /*
543 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
544 * here, dccp_create_openreq_child now does this for us, see the comment in
545 * that function for the gory details. -acme
546 */
547
548 /* It is tricky place. Until this moment IPv4 tcp
549 worked with IPv6 icsk.icsk_af_ops.
550 Sync it now.
551 */
552 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
553
554 return newsk;
555 }
556
557 opt = np->opt;
558
559 if (sk_acceptq_is_full(sk))
560 goto out_overflow;
561
562 if (dst == NULL) {
563 struct in6_addr *final_p = NULL, final;
564 struct flowi fl;
565
566 memset(&fl, 0, sizeof(fl));
567 fl.proto = IPPROTO_DCCP;
568 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
569 if (opt != NULL && opt->srcrt != NULL) {
570 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
571
572 ipv6_addr_copy(&final, &fl.fl6_dst);
573 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
574 final_p = &final;
575 }
576 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
577 fl.oif = sk->sk_bound_dev_if;
578 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
579 fl.fl_ip_sport = inet_sk(sk)->sport;
580 security_sk_classify_flow(sk, &fl);
581
582 if (ip6_dst_lookup(sk, &dst, &fl))
583 goto out;
584
585 if (final_p)
586 ipv6_addr_copy(&fl.fl6_dst, final_p);
587
588 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
589 goto out;
590 }
591
592 newsk = dccp_create_openreq_child(sk, req, skb);
593 if (newsk == NULL)
594 goto out;
595
596 /*
597 * No need to charge this sock to the relevant IPv6 refcnt debug socks
598 * count here, dccp_create_openreq_child now does this for us, see the
599 * comment in that function for the gory details. -acme
600 */
601
602 __ip6_dst_store(newsk, dst, NULL, NULL);
603 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
604 NETIF_F_TSO);
605 newdp6 = (struct dccp6_sock *)newsk;
606 newinet = inet_sk(newsk);
607 newinet->pinet6 = &newdp6->inet6;
608 newdp = dccp_sk(newsk);
609 newnp = inet6_sk(newsk);
610
611 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
612
613 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
614 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
615 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
616 newsk->sk_bound_dev_if = ireq6->iif;
617
618 /* Now IPv6 options...
619
620 First: no IPv4 options.
621 */
622 newinet->opt = NULL;
623
624 /* Clone RX bits */
625 newnp->rxopt.all = np->rxopt.all;
626
627 /* Clone pktoptions received with SYN */
628 newnp->pktoptions = NULL;
629 if (ireq6->pktopts != NULL) {
630 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
631 kfree_skb(ireq6->pktopts);
632 ireq6->pktopts = NULL;
633 if (newnp->pktoptions)
634 skb_set_owner_r(newnp->pktoptions, newsk);
635 }
636 newnp->opt = NULL;
637 newnp->mcast_oif = inet6_iif(skb);
638 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
639
640 /*
641 * Clone native IPv6 options from listening socket (if any)
642 *
643 * Yes, keeping reference count would be much more clever, but we make
644 * one more one thing there: reattach optmem to newsk.
645 */
646 if (opt != NULL) {
647 newnp->opt = ipv6_dup_options(newsk, opt);
648 if (opt != np->opt)
649 sock_kfree_s(sk, opt, opt->tot_len);
650 }
651
652 inet_csk(newsk)->icsk_ext_hdr_len = 0;
653 if (newnp->opt != NULL)
654 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
655 newnp->opt->opt_flen);
656
657 dccp_sync_mss(newsk, dst_mtu(dst));
658
659 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
660
661 __inet6_hash(&dccp_hashinfo, newsk);
662 inet_inherit_port(&dccp_hashinfo, sk, newsk);
663
664 return newsk;
665
666 out_overflow:
667 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
668 out:
669 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
670 if (opt != NULL && opt != np->opt)
671 sock_kfree_s(sk, opt, opt->tot_len);
672 dst_release(dst);
673 return NULL;
674 }
675
676 /* The socket must have it's spinlock held when we get
677 * here.
678 *
679 * We have a potential double-lock case here, so even when
680 * doing backlog processing we use the BH locking scheme.
681 * This is because we cannot sleep with the original spinlock
682 * held.
683 */
684 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
685 {
686 struct ipv6_pinfo *np = inet6_sk(sk);
687 struct sk_buff *opt_skb = NULL;
688
689 /* Imagine: socket is IPv6. IPv4 packet arrives,
690 goes to IPv4 receive handler and backlogged.
691 From backlog it always goes here. Kerboom...
692 Fortunately, dccp_rcv_established and rcv_established
693 handle them correctly, but it is not case with
694 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
695 */
696
697 if (skb->protocol == htons(ETH_P_IP))
698 return dccp_v4_do_rcv(sk, skb);
699
700 if (sk_filter(sk, skb))
701 goto discard;
702
703 /*
704 * socket locking is here for SMP purposes as backlog rcv is currently
705 * called with bh processing disabled.
706 */
707
708 /* Do Stevens' IPV6_PKTOPTIONS.
709
710 Yes, guys, it is the only place in our code, where we
711 may make it not affecting IPv4.
712 The rest of code is protocol independent,
713 and I do not like idea to uglify IPv4.
714
715 Actually, all the idea behind IPV6_PKTOPTIONS
716 looks not very well thought. For now we latch
717 options, received in the last packet, enqueued
718 by tcp. Feel free to propose better solution.
719 --ANK (980728)
720 */
721 if (np->rxopt.all)
722 /*
723 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
724 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
725 */
726 opt_skb = skb_clone(skb, GFP_ATOMIC);
727
728 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
729 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
730 goto reset;
731 if (opt_skb) {
732 /* XXX This is where we would goto ipv6_pktoptions. */
733 __kfree_skb(opt_skb);
734 }
735 return 0;
736 }
737
738 /*
739 * Step 3: Process LISTEN state
740 * If S.state == LISTEN,
741 * If P.type == Request or P contains a valid Init Cookie option,
742 * (* Must scan the packet's options to check for Init
743 * Cookies. Only Init Cookies are processed here,
744 * however; other options are processed in Step 8. This
745 * scan need only be performed if the endpoint uses Init
746 * Cookies *)
747 * (* Generate a new socket and switch to that socket *)
748 * Set S := new socket for this port pair
749 * S.state = RESPOND
750 * Choose S.ISS (initial seqno) or set from Init Cookies
751 * Initialize S.GAR := S.ISS
752 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
753 * Continue with S.state == RESPOND
754 * (* A Response packet will be generated in Step 11 *)
755 * Otherwise,
756 * Generate Reset(No Connection) unless P.type == Reset
757 * Drop packet and return
758 *
759 * NOTE: the check for the packet types is done in
760 * dccp_rcv_state_process
761 */
762 if (sk->sk_state == DCCP_LISTEN) {
763 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
764
765 if (nsk == NULL)
766 goto discard;
767 /*
768 * Queue it on the new socket if the new socket is active,
769 * otherwise we just shortcircuit this and continue with
770 * the new socket..
771 */
772 if (nsk != sk) {
773 if (dccp_child_process(sk, nsk, skb))
774 goto reset;
775 if (opt_skb != NULL)
776 __kfree_skb(opt_skb);
777 return 0;
778 }
779 }
780
781 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
782 goto reset;
783 if (opt_skb) {
784 /* XXX This is where we would goto ipv6_pktoptions. */
785 __kfree_skb(opt_skb);
786 }
787 return 0;
788
789 reset:
790 dccp_v6_ctl_send_reset(sk, skb);
791 discard:
792 if (opt_skb != NULL)
793 __kfree_skb(opt_skb);
794 kfree_skb(skb);
795 return 0;
796 }
797
798 static int dccp_v6_rcv(struct sk_buff **pskb)
799 {
800 const struct dccp_hdr *dh;
801 struct sk_buff *skb = *pskb;
802 struct sock *sk;
803 int min_cov;
804
805 /* Step 1: Check header basics */
806
807 if (dccp_invalid_packet(skb))
808 goto discard_it;
809
810 /* Step 1: If header checksum is incorrect, drop packet and return. */
811 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
812 &ipv6_hdr(skb)->daddr)) {
813 DCCP_WARN("dropped packet with invalid checksum\n");
814 goto discard_it;
815 }
816
817 dh = dccp_hdr(skb);
818
819 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
820 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
821
822 if (dccp_packet_without_ack(skb))
823 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
824 else
825 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
826
827 /* Step 2:
828 * Look up flow ID in table and get corresponding socket */
829 sk = __inet6_lookup(&dccp_hashinfo, &ipv6_hdr(skb)->saddr,
830 dh->dccph_sport,
831 &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
832 inet6_iif(skb));
833 /*
834 * Step 2:
835 * If no socket ...
836 */
837 if (sk == NULL) {
838 dccp_pr_debug("failed to look up flow ID in table and "
839 "get corresponding socket\n");
840 goto no_dccp_socket;
841 }
842
843 /*
844 * Step 2:
845 * ... or S.state == TIMEWAIT,
846 * Generate Reset(No Connection) unless P.type == Reset
847 * Drop packet and return
848 */
849 if (sk->sk_state == DCCP_TIME_WAIT) {
850 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
851 inet_twsk_put(inet_twsk(sk));
852 goto no_dccp_socket;
853 }
854
855 /*
856 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
857 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
858 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
859 */
860 min_cov = dccp_sk(sk)->dccps_pcrlen;
861 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
862 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
863 dh->dccph_cscov, min_cov);
864 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
865 goto discard_and_relse;
866 }
867
868 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
869 goto discard_and_relse;
870
871 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
872
873 no_dccp_socket:
874 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
875 goto discard_it;
876 /*
877 * Step 2:
878 * If no socket ...
879 * Generate Reset(No Connection) unless P.type == Reset
880 * Drop packet and return
881 */
882 if (dh->dccph_type != DCCP_PKT_RESET) {
883 DCCP_SKB_CB(skb)->dccpd_reset_code =
884 DCCP_RESET_CODE_NO_CONNECTION;
885 dccp_v6_ctl_send_reset(sk, skb);
886 }
887
888 discard_it:
889 kfree_skb(skb);
890 return 0;
891
892 discard_and_relse:
893 sock_put(sk);
894 goto discard_it;
895 }
896
897 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
898 int addr_len)
899 {
900 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
901 struct inet_connection_sock *icsk = inet_csk(sk);
902 struct inet_sock *inet = inet_sk(sk);
903 struct ipv6_pinfo *np = inet6_sk(sk);
904 struct dccp_sock *dp = dccp_sk(sk);
905 struct in6_addr *saddr = NULL, *final_p = NULL, final;
906 struct flowi fl;
907 struct dst_entry *dst;
908 int addr_type;
909 int err;
910
911 dp->dccps_role = DCCP_ROLE_CLIENT;
912
913 if (addr_len < SIN6_LEN_RFC2133)
914 return -EINVAL;
915
916 if (usin->sin6_family != AF_INET6)
917 return -EAFNOSUPPORT;
918
919 memset(&fl, 0, sizeof(fl));
920
921 if (np->sndflow) {
922 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
923 IP6_ECN_flow_init(fl.fl6_flowlabel);
924 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
925 struct ip6_flowlabel *flowlabel;
926 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
927 if (flowlabel == NULL)
928 return -EINVAL;
929 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
930 fl6_sock_release(flowlabel);
931 }
932 }
933 /*
934 * connect() to INADDR_ANY means loopback (BSD'ism).
935 */
936 if (ipv6_addr_any(&usin->sin6_addr))
937 usin->sin6_addr.s6_addr[15] = 1;
938
939 addr_type = ipv6_addr_type(&usin->sin6_addr);
940
941 if (addr_type & IPV6_ADDR_MULTICAST)
942 return -ENETUNREACH;
943
944 if (addr_type & IPV6_ADDR_LINKLOCAL) {
945 if (addr_len >= sizeof(struct sockaddr_in6) &&
946 usin->sin6_scope_id) {
947 /* If interface is set while binding, indices
948 * must coincide.
949 */
950 if (sk->sk_bound_dev_if &&
951 sk->sk_bound_dev_if != usin->sin6_scope_id)
952 return -EINVAL;
953
954 sk->sk_bound_dev_if = usin->sin6_scope_id;
955 }
956
957 /* Connect to link-local address requires an interface */
958 if (!sk->sk_bound_dev_if)
959 return -EINVAL;
960 }
961
962 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
963 np->flow_label = fl.fl6_flowlabel;
964
965 /*
966 * DCCP over IPv4
967 */
968 if (addr_type == IPV6_ADDR_MAPPED) {
969 u32 exthdrlen = icsk->icsk_ext_hdr_len;
970 struct sockaddr_in sin;
971
972 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
973
974 if (__ipv6_only_sock(sk))
975 return -ENETUNREACH;
976
977 sin.sin_family = AF_INET;
978 sin.sin_port = usin->sin6_port;
979 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
980
981 icsk->icsk_af_ops = &dccp_ipv6_mapped;
982 sk->sk_backlog_rcv = dccp_v4_do_rcv;
983
984 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
985 if (err) {
986 icsk->icsk_ext_hdr_len = exthdrlen;
987 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
988 sk->sk_backlog_rcv = dccp_v6_do_rcv;
989 goto failure;
990 } else {
991 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
992 inet->saddr);
993 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
994 inet->rcv_saddr);
995 }
996
997 return err;
998 }
999
1000 if (!ipv6_addr_any(&np->rcv_saddr))
1001 saddr = &np->rcv_saddr;
1002
1003 fl.proto = IPPROTO_DCCP;
1004 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1005 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1006 fl.oif = sk->sk_bound_dev_if;
1007 fl.fl_ip_dport = usin->sin6_port;
1008 fl.fl_ip_sport = inet->sport;
1009 security_sk_classify_flow(sk, &fl);
1010
1011 if (np->opt != NULL && np->opt->srcrt != NULL) {
1012 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1013
1014 ipv6_addr_copy(&final, &fl.fl6_dst);
1015 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1016 final_p = &final;
1017 }
1018
1019 err = ip6_dst_lookup(sk, &dst, &fl);
1020 if (err)
1021 goto failure;
1022
1023 if (final_p)
1024 ipv6_addr_copy(&fl.fl6_dst, final_p);
1025
1026 err = __xfrm_lookup(&dst, &fl, sk, 1);
1027 if (err < 0) {
1028 if (err == -EREMOTE)
1029 err = ip6_dst_blackhole(sk, &dst, &fl);
1030 if (err < 0)
1031 goto failure;
1032 }
1033
1034 if (saddr == NULL) {
1035 saddr = &fl.fl6_src;
1036 ipv6_addr_copy(&np->rcv_saddr, saddr);
1037 }
1038
1039 /* set the source address */
1040 ipv6_addr_copy(&np->saddr, saddr);
1041 inet->rcv_saddr = LOOPBACK4_IPV6;
1042
1043 __ip6_dst_store(sk, dst, NULL, NULL);
1044
1045 icsk->icsk_ext_hdr_len = 0;
1046 if (np->opt != NULL)
1047 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1048 np->opt->opt_nflen);
1049
1050 inet->dport = usin->sin6_port;
1051
1052 dccp_set_state(sk, DCCP_REQUESTING);
1053 err = inet6_hash_connect(&dccp_death_row, sk);
1054 if (err)
1055 goto late_failure;
1056
1057 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1058 np->daddr.s6_addr32,
1059 inet->sport, inet->dport);
1060 err = dccp_connect(sk);
1061 if (err)
1062 goto late_failure;
1063
1064 return 0;
1065
1066 late_failure:
1067 dccp_set_state(sk, DCCP_CLOSED);
1068 __sk_dst_reset(sk);
1069 failure:
1070 inet->dport = 0;
1071 sk->sk_route_caps = 0;
1072 return err;
1073 }
1074
1075 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1076 .queue_xmit = inet6_csk_xmit,
1077 .send_check = dccp_v6_send_check,
1078 .rebuild_header = inet6_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 ipv6hdr),
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 /*
1093 * DCCP over IPv4 via INET6 API
1094 */
1095 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1096 .queue_xmit = ip_queue_xmit,
1097 .send_check = dccp_v4_send_check,
1098 .rebuild_header = inet_sk_rebuild_header,
1099 .conn_request = dccp_v6_conn_request,
1100 .syn_recv_sock = dccp_v6_request_recv_sock,
1101 .net_header_len = sizeof(struct iphdr),
1102 .setsockopt = ipv6_setsockopt,
1103 .getsockopt = ipv6_getsockopt,
1104 .addr2sockaddr = inet6_csk_addr2sockaddr,
1105 .sockaddr_len = sizeof(struct sockaddr_in6),
1106 #ifdef CONFIG_COMPAT
1107 .compat_setsockopt = compat_ipv6_setsockopt,
1108 .compat_getsockopt = compat_ipv6_getsockopt,
1109 #endif
1110 };
1111
1112 /* NOTE: A lot of things set to zero explicitly by call to
1113 * sk_alloc() so need not be done here.
1114 */
1115 static int dccp_v6_init_sock(struct sock *sk)
1116 {
1117 static __u8 dccp_v6_ctl_sock_initialized;
1118 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1119
1120 if (err == 0) {
1121 if (unlikely(!dccp_v6_ctl_sock_initialized))
1122 dccp_v6_ctl_sock_initialized = 1;
1123 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1124 }
1125
1126 return err;
1127 }
1128
1129 static int dccp_v6_destroy_sock(struct sock *sk)
1130 {
1131 dccp_destroy_sock(sk);
1132 return inet6_destroy_sock(sk);
1133 }
1134
1135 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1136 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1137 };
1138
1139 static struct proto dccp_v6_prot = {
1140 .name = "DCCPv6",
1141 .owner = THIS_MODULE,
1142 .close = dccp_close,
1143 .connect = dccp_v6_connect,
1144 .disconnect = dccp_disconnect,
1145 .ioctl = dccp_ioctl,
1146 .init = dccp_v6_init_sock,
1147 .setsockopt = dccp_setsockopt,
1148 .getsockopt = dccp_getsockopt,
1149 .sendmsg = dccp_sendmsg,
1150 .recvmsg = dccp_recvmsg,
1151 .backlog_rcv = dccp_v6_do_rcv,
1152 .hash = dccp_v6_hash,
1153 .unhash = dccp_unhash,
1154 .accept = inet_csk_accept,
1155 .get_port = dccp_v6_get_port,
1156 .shutdown = dccp_shutdown,
1157 .destroy = dccp_v6_destroy_sock,
1158 .orphan_count = &dccp_orphan_count,
1159 .max_header = MAX_DCCP_HEADER,
1160 .obj_size = sizeof(struct dccp6_sock),
1161 .rsk_prot = &dccp6_request_sock_ops,
1162 .twsk_prot = &dccp6_timewait_sock_ops,
1163 #ifdef CONFIG_COMPAT
1164 .compat_setsockopt = compat_dccp_setsockopt,
1165 .compat_getsockopt = compat_dccp_getsockopt,
1166 #endif
1167 };
1168
1169 static struct inet6_protocol dccp_v6_protocol = {
1170 .handler = dccp_v6_rcv,
1171 .err_handler = dccp_v6_err,
1172 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1173 };
1174
1175 static struct proto_ops inet6_dccp_ops = {
1176 .family = PF_INET6,
1177 .owner = THIS_MODULE,
1178 .release = inet6_release,
1179 .bind = inet6_bind,
1180 .connect = inet_stream_connect,
1181 .socketpair = sock_no_socketpair,
1182 .accept = inet_accept,
1183 .getname = inet6_getname,
1184 .poll = dccp_poll,
1185 .ioctl = inet6_ioctl,
1186 .listen = inet_dccp_listen,
1187 .shutdown = inet_shutdown,
1188 .setsockopt = sock_common_setsockopt,
1189 .getsockopt = sock_common_getsockopt,
1190 .sendmsg = inet_sendmsg,
1191 .recvmsg = sock_common_recvmsg,
1192 .mmap = sock_no_mmap,
1193 .sendpage = sock_no_sendpage,
1194 #ifdef CONFIG_COMPAT
1195 .compat_setsockopt = compat_sock_common_setsockopt,
1196 .compat_getsockopt = compat_sock_common_getsockopt,
1197 #endif
1198 };
1199
1200 static struct inet_protosw dccp_v6_protosw = {
1201 .type = SOCK_DCCP,
1202 .protocol = IPPROTO_DCCP,
1203 .prot = &dccp_v6_prot,
1204 .ops = &inet6_dccp_ops,
1205 .capability = -1,
1206 .flags = INET_PROTOSW_ICSK,
1207 };
1208
1209 static int __init dccp_v6_init(void)
1210 {
1211 int err = proto_register(&dccp_v6_prot, 1);
1212
1213 if (err != 0)
1214 goto out;
1215
1216 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1217 if (err != 0)
1218 goto out_unregister_proto;
1219
1220 inet6_register_protosw(&dccp_v6_protosw);
1221
1222 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1223 SOCK_DCCP, IPPROTO_DCCP);
1224 if (err != 0)
1225 goto out_unregister_protosw;
1226 out:
1227 return err;
1228 out_unregister_protosw:
1229 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1230 inet6_unregister_protosw(&dccp_v6_protosw);
1231 out_unregister_proto:
1232 proto_unregister(&dccp_v6_prot);
1233 goto out;
1234 }
1235
1236 static void __exit dccp_v6_exit(void)
1237 {
1238 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1239 inet6_unregister_protosw(&dccp_v6_protosw);
1240 proto_unregister(&dccp_v6_prot);
1241 }
1242
1243 module_init(dccp_v6_init);
1244 module_exit(dccp_v6_exit);
1245
1246 /*
1247 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1248 * values directly, Also cover the case where the protocol is not specified,
1249 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1250 */
1251 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1252 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1253 MODULE_LICENSE("GPL");
1254 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1255 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
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