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mm: fix page table unmap for stack guard page properly
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / dccp / ipv6.c
blob3b11e41a2929e717ded1865c864a6f7b1b5fb7e0
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/slab.h>
18 #include <linux/xfrm.h>
19
20 #include <net/addrconf.h>
21 #include <net/inet_common.h>
22 #include <net/inet_hashtables.h>
23 #include <net/inet_sock.h>
24 #include <net/inet6_connection_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/ip6_route.h>
27 #include <net/ipv6.h>
28 #include <net/protocol.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_checksum.h>
31 #include <net/xfrm.h>
32
33 #include "dccp.h"
34 #include "ipv6.h"
35 #include "feat.h"
36
37 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
38
39 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
41
42 static void dccp_v6_hash(struct sock *sk)
43 {
44 if (sk->sk_state != DCCP_CLOSED) {
45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
46 inet_hash(sk);
47 return;
48 }
49 local_bh_disable();
50 __inet6_hash(sk, NULL);
51 local_bh_enable();
52 }
53 }
54
55 /* add pseudo-header to DCCP checksum stored in skb->csum */
56 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
57 struct in6_addr *saddr,
58 struct in6_addr *daddr)
59 {
60 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
61 }
62
63 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
64 struct sk_buff *skb)
65 {
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
68
69 dccp_csum_outgoing(skb);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
71 }
72
73 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
74 __be16 sport, __be16 dport )
75 {
76 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
77 }
78
79 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
80 {
81 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
82 ipv6_hdr(skb)->saddr.s6_addr32,
83 dccp_hdr(skb)->dccph_dport,
84 dccp_hdr(skb)->dccph_sport );
85
86 }
87
88 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
89 u8 type, u8 code, int offset, __be32 info)
90 {
91 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
92 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
93 struct dccp_sock *dp;
94 struct ipv6_pinfo *np;
95 struct sock *sk;
96 int err;
97 __u64 seq;
98 struct net *net = dev_net(skb->dev);
99
100 if (skb->len < offset + sizeof(*dh) ||
101 skb->len < offset + __dccp_basic_hdr_len(dh)) {
102 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
103 ICMP6_MIB_INERRORS);
104 return;
105 }
106
107 sk = inet6_lookup(net, &dccp_hashinfo,
108 &hdr->daddr, dh->dccph_dport,
109 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
110
111 if (sk == NULL) {
112 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
113 ICMP6_MIB_INERRORS);
114 return;
115 }
116
117 if (sk->sk_state == DCCP_TIME_WAIT) {
118 inet_twsk_put(inet_twsk(sk));
119 return;
120 }
121
122 bh_lock_sock(sk);
123 if (sock_owned_by_user(sk))
124 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
125
126 if (sk->sk_state == DCCP_CLOSED)
127 goto out;
128
129 dp = dccp_sk(sk);
130 seq = dccp_hdr_seq(dh);
131 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
132 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
133 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
134 goto out;
135 }
136
137 np = inet6_sk(sk);
138
139 if (type == ICMPV6_PKT_TOOBIG) {
140 struct dst_entry *dst = NULL;
141
142 if (sock_owned_by_user(sk))
143 goto out;
144 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
145 goto out;
146
147 /* icmp should have updated the destination cache entry */
148 dst = __sk_dst_check(sk, np->dst_cookie);
149 if (dst == NULL) {
150 struct inet_sock *inet = inet_sk(sk);
151 struct flowi fl;
152
153 /* BUGGG_FUTURE: Again, it is not clear how
154 to handle rthdr case. Ignore this complexity
155 for now.
156 */
157 memset(&fl, 0, sizeof(fl));
158 fl.proto = IPPROTO_DCCP;
159 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
160 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
161 fl.oif = sk->sk_bound_dev_if;
162 fl.fl_ip_dport = inet->inet_dport;
163 fl.fl_ip_sport = inet->inet_sport;
164 security_sk_classify_flow(sk, &fl);
165
166 err = ip6_dst_lookup(sk, &dst, &fl);
167 if (err) {
168 sk->sk_err_soft = -err;
169 goto out;
170 }
171
172 err = xfrm_lookup(net, &dst, &fl, sk, 0);
173 if (err < 0) {
174 sk->sk_err_soft = -err;
175 goto out;
176 }
177 } else
178 dst_hold(dst);
179
180 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
181 dccp_sync_mss(sk, dst_mtu(dst));
182 } /* else let the usual retransmit timer handle it */
183 dst_release(dst);
184 goto out;
185 }
186
187 icmpv6_err_convert(type, code, &err);
188
189 /* Might be for an request_sock */
190 switch (sk->sk_state) {
191 struct request_sock *req, **prev;
192 case DCCP_LISTEN:
193 if (sock_owned_by_user(sk))
194 goto out;
195
196 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
197 &hdr->daddr, &hdr->saddr,
198 inet6_iif(skb));
199 if (req == NULL)
200 goto out;
201
202 /*
203 * ICMPs are not backlogged, hence we cannot get an established
204 * socket here.
205 */
206 WARN_ON(req->sk != NULL);
207
208 if (seq != dccp_rsk(req)->dreq_iss) {
209 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
210 goto out;
211 }
212
213 inet_csk_reqsk_queue_drop(sk, req, prev);
214 goto out;
215
216 case DCCP_REQUESTING:
217 case DCCP_RESPOND: /* Cannot happen.
218 It can, it SYNs are crossed. --ANK */
219 if (!sock_owned_by_user(sk)) {
220 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
221 sk->sk_err = err;
222 /*
223 * Wake people up to see the error
224 * (see connect in sock.c)
225 */
226 sk->sk_error_report(sk);
227 dccp_done(sk);
228 } else
229 sk->sk_err_soft = err;
230 goto out;
231 }
232
233 if (!sock_owned_by_user(sk) && np->recverr) {
234 sk->sk_err = err;
235 sk->sk_error_report(sk);
236 } else
237 sk->sk_err_soft = err;
238
239 out:
240 bh_unlock_sock(sk);
241 sock_put(sk);
242 }
243
244
245 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
246 struct request_values *rv_unused)
247 {
248 struct inet6_request_sock *ireq6 = inet6_rsk(req);
249 struct ipv6_pinfo *np = inet6_sk(sk);
250 struct sk_buff *skb;
251 struct ipv6_txoptions *opt = NULL;
252 struct in6_addr *final_p = NULL, final;
253 struct flowi fl;
254 int err = -1;
255 struct dst_entry *dst;
256
257 memset(&fl, 0, sizeof(fl));
258 fl.proto = IPPROTO_DCCP;
259 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
260 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
261 fl.fl6_flowlabel = 0;
262 fl.oif = ireq6->iif;
263 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
264 fl.fl_ip_sport = inet_rsk(req)->loc_port;
265 security_req_classify_flow(req, &fl);
266
267 opt = np->opt;
268
269 if (opt != NULL && opt->srcrt != NULL) {
270 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
271
272 ipv6_addr_copy(&final, &fl.fl6_dst);
273 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
274 final_p = &final;
275 }
276
277 err = ip6_dst_lookup(sk, &dst, &fl);
278 if (err)
279 goto done;
280
281 if (final_p)
282 ipv6_addr_copy(&fl.fl6_dst, final_p);
283
284 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
285 if (err < 0)
286 goto done;
287
288 skb = dccp_make_response(sk, dst, req);
289 if (skb != NULL) {
290 struct dccp_hdr *dh = dccp_hdr(skb);
291
292 dh->dccph_checksum = dccp_v6_csum_finish(skb,
293 &ireq6->loc_addr,
294 &ireq6->rmt_addr);
295 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
296 err = ip6_xmit(sk, skb, &fl, opt, 0);
297 err = net_xmit_eval(err);
298 }
299
300 done:
301 if (opt != NULL && opt != np->opt)
302 sock_kfree_s(sk, opt, opt->tot_len);
303 dst_release(dst);
304 return err;
305 }
306
307 static void dccp_v6_reqsk_destructor(struct request_sock *req)
308 {
309 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
310 if (inet6_rsk(req)->pktopts != NULL)
311 kfree_skb(inet6_rsk(req)->pktopts);
312 }
313
314 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
315 {
316 struct ipv6hdr *rxip6h;
317 struct sk_buff *skb;
318 struct flowi fl;
319 struct net *net = dev_net(skb_dst(rxskb)->dev);
320 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
321 struct dst_entry *dst;
322
323 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
324 return;
325
326 if (!ipv6_unicast_destination(rxskb))
327 return;
328
329 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
330 if (skb == NULL)
331 return;
332
333 rxip6h = ipv6_hdr(rxskb);
334 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
335 &rxip6h->daddr);
336
337 memset(&fl, 0, sizeof(fl));
338 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
339 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
340
341 fl.proto = IPPROTO_DCCP;
342 fl.oif = inet6_iif(rxskb);
343 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
344 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
345 security_skb_classify_flow(rxskb, &fl);
346
347 /* sk = NULL, but it is safe for now. RST socket required. */
348 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
349 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
350 skb_dst_set(skb, dst);
351 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
352 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
353 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
354 return;
355 }
356 }
357
358 kfree_skb(skb);
359 }
360
361 static struct request_sock_ops dccp6_request_sock_ops = {
362 .family = AF_INET6,
363 .obj_size = sizeof(struct dccp6_request_sock),
364 .rtx_syn_ack = dccp_v6_send_response,
365 .send_ack = dccp_reqsk_send_ack,
366 .destructor = dccp_v6_reqsk_destructor,
367 .send_reset = dccp_v6_ctl_send_reset,
368 };
369
370 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
371 {
372 const struct dccp_hdr *dh = dccp_hdr(skb);
373 const struct ipv6hdr *iph = ipv6_hdr(skb);
374 struct sock *nsk;
375 struct request_sock **prev;
376 /* Find possible connection requests. */
377 struct request_sock *req = inet6_csk_search_req(sk, &prev,
378 dh->dccph_sport,
379 &iph->saddr,
380 &iph->daddr,
381 inet6_iif(skb));
382 if (req != NULL)
383 return dccp_check_req(sk, skb, req, prev);
384
385 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
386 &iph->saddr, dh->dccph_sport,
387 &iph->daddr, ntohs(dh->dccph_dport),
388 inet6_iif(skb));
389 if (nsk != NULL) {
390 if (nsk->sk_state != DCCP_TIME_WAIT) {
391 bh_lock_sock(nsk);
392 return nsk;
393 }
394 inet_twsk_put(inet_twsk(nsk));
395 return NULL;
396 }
397
398 return sk;
399 }
400
401 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
402 {
403 struct request_sock *req;
404 struct dccp_request_sock *dreq;
405 struct inet6_request_sock *ireq6;
406 struct ipv6_pinfo *np = inet6_sk(sk);
407 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
408 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
409
410 if (skb->protocol == htons(ETH_P_IP))
411 return dccp_v4_conn_request(sk, skb);
412
413 if (!ipv6_unicast_destination(skb))
414 return 0; /* discard, don't send a reset here */
415
416 if (dccp_bad_service_code(sk, service)) {
417 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
418 goto drop;
419 }
420 /*
421 * There are no SYN attacks on IPv6, yet...
422 */
423 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
424 if (inet_csk_reqsk_queue_is_full(sk))
425 goto drop;
426
427 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
428 goto drop;
429
430 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
431 if (req == NULL)
432 goto drop;
433
434 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
435 goto drop_and_free;
436
437 dreq = dccp_rsk(req);
438 if (dccp_parse_options(sk, dreq, skb))
439 goto drop_and_free;
440
441 if (security_inet_conn_request(sk, skb, req))
442 goto drop_and_free;
443
444 ireq6 = inet6_rsk(req);
445 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
446 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
447
448 if (ipv6_opt_accepted(sk, skb) ||
449 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
450 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
451 atomic_inc(&skb->users);
452 ireq6->pktopts = skb;
453 }
454 ireq6->iif = sk->sk_bound_dev_if;
455
456 /* So that link locals have meaning */
457 if (!sk->sk_bound_dev_if &&
458 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
459 ireq6->iif = inet6_iif(skb);
460
461 /*
462 * Step 3: Process LISTEN state
463 *
464 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
465 *
466 * In fact we defer setting S.GSR, S.SWL, S.SWH to
467 * dccp_create_openreq_child.
468 */
469 dreq->dreq_isr = dcb->dccpd_seq;
470 dreq->dreq_iss = dccp_v6_init_sequence(skb);
471 dreq->dreq_service = service;
472
473 if (dccp_v6_send_response(sk, req, NULL))
474 goto drop_and_free;
475
476 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
477 return 0;
478
479 drop_and_free:
480 reqsk_free(req);
481 drop:
482 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
483 return -1;
484 }
485
486 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
487 struct sk_buff *skb,
488 struct request_sock *req,
489 struct dst_entry *dst)
490 {
491 struct inet6_request_sock *ireq6 = inet6_rsk(req);
492 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
493 struct inet_sock *newinet;
494 struct dccp_sock *newdp;
495 struct dccp6_sock *newdp6;
496 struct sock *newsk;
497 struct ipv6_txoptions *opt;
498
499 if (skb->protocol == htons(ETH_P_IP)) {
500 /*
501 * v6 mapped
502 */
503 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
504 if (newsk == NULL)
505 return NULL;
506
507 newdp6 = (struct dccp6_sock *)newsk;
508 newdp = dccp_sk(newsk);
509 newinet = inet_sk(newsk);
510 newinet->pinet6 = &newdp6->inet6;
511 newnp = inet6_sk(newsk);
512
513 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
514
515 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
516
517 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
518
519 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
520
521 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
522 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
523 newnp->pktoptions = NULL;
524 newnp->opt = NULL;
525 newnp->mcast_oif = inet6_iif(skb);
526 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
527
528 /*
529 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
530 * here, dccp_create_openreq_child now does this for us, see the comment in
531 * that function for the gory details. -acme
532 */
533
534 /* It is tricky place. Until this moment IPv4 tcp
535 worked with IPv6 icsk.icsk_af_ops.
536 Sync it now.
537 */
538 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
539
540 return newsk;
541 }
542
543 opt = np->opt;
544
545 if (sk_acceptq_is_full(sk))
546 goto out_overflow;
547
548 if (dst == NULL) {
549 struct in6_addr *final_p = NULL, final;
550 struct flowi fl;
551
552 memset(&fl, 0, sizeof(fl));
553 fl.proto = IPPROTO_DCCP;
554 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
555 if (opt != NULL && opt->srcrt != NULL) {
556 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
557
558 ipv6_addr_copy(&final, &fl.fl6_dst);
559 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
560 final_p = &final;
561 }
562 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
563 fl.oif = sk->sk_bound_dev_if;
564 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
565 fl.fl_ip_sport = inet_rsk(req)->loc_port;
566 security_sk_classify_flow(sk, &fl);
567
568 if (ip6_dst_lookup(sk, &dst, &fl))
569 goto out;
570
571 if (final_p)
572 ipv6_addr_copy(&fl.fl6_dst, final_p);
573
574 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
575 goto out;
576 }
577
578 newsk = dccp_create_openreq_child(sk, req, skb);
579 if (newsk == NULL)
580 goto out;
581
582 /*
583 * No need to charge this sock to the relevant IPv6 refcnt debug socks
584 * count here, dccp_create_openreq_child now does this for us, see the
585 * comment in that function for the gory details. -acme
586 */
587
588 __ip6_dst_store(newsk, dst, NULL, NULL);
589 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
590 NETIF_F_TSO);
591 newdp6 = (struct dccp6_sock *)newsk;
592 newinet = inet_sk(newsk);
593 newinet->pinet6 = &newdp6->inet6;
594 newdp = dccp_sk(newsk);
595 newnp = inet6_sk(newsk);
596
597 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
598
599 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
600 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
601 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
602 newsk->sk_bound_dev_if = ireq6->iif;
603
604 /* Now IPv6 options...
605
606 First: no IPv4 options.
607 */
608 newinet->opt = NULL;
609
610 /* Clone RX bits */
611 newnp->rxopt.all = np->rxopt.all;
612
613 /* Clone pktoptions received with SYN */
614 newnp->pktoptions = NULL;
615 if (ireq6->pktopts != NULL) {
616 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
617 kfree_skb(ireq6->pktopts);
618 ireq6->pktopts = NULL;
619 if (newnp->pktoptions)
620 skb_set_owner_r(newnp->pktoptions, newsk);
621 }
622 newnp->opt = NULL;
623 newnp->mcast_oif = inet6_iif(skb);
624 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
625
626 /*
627 * Clone native IPv6 options from listening socket (if any)
628 *
629 * Yes, keeping reference count would be much more clever, but we make
630 * one more one thing there: reattach optmem to newsk.
631 */
632 if (opt != NULL) {
633 newnp->opt = ipv6_dup_options(newsk, opt);
634 if (opt != np->opt)
635 sock_kfree_s(sk, opt, opt->tot_len);
636 }
637
638 inet_csk(newsk)->icsk_ext_hdr_len = 0;
639 if (newnp->opt != NULL)
640 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
641 newnp->opt->opt_flen);
642
643 dccp_sync_mss(newsk, dst_mtu(dst));
644
645 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
646 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
647
648 __inet6_hash(newsk, NULL);
649 __inet_inherit_port(sk, newsk);
650
651 return newsk;
652
653 out_overflow:
654 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
655 out:
656 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
657 if (opt != NULL && opt != np->opt)
658 sock_kfree_s(sk, opt, opt->tot_len);
659 dst_release(dst);
660 return NULL;
661 }
662
663 /* The socket must have it's spinlock held when we get
664 * here.
665 *
666 * We have a potential double-lock case here, so even when
667 * doing backlog processing we use the BH locking scheme.
668 * This is because we cannot sleep with the original spinlock
669 * held.
670 */
671 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
672 {
673 struct ipv6_pinfo *np = inet6_sk(sk);
674 struct sk_buff *opt_skb = NULL;
675
676 /* Imagine: socket is IPv6. IPv4 packet arrives,
677 goes to IPv4 receive handler and backlogged.
678 From backlog it always goes here. Kerboom...
679 Fortunately, dccp_rcv_established and rcv_established
680 handle them correctly, but it is not case with
681 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
682 */
683
684 if (skb->protocol == htons(ETH_P_IP))
685 return dccp_v4_do_rcv(sk, skb);
686
687 if (sk_filter(sk, skb))
688 goto discard;
689
690 /*
691 * socket locking is here for SMP purposes as backlog rcv is currently
692 * called with bh processing disabled.
693 */
694
695 /* Do Stevens' IPV6_PKTOPTIONS.
696
697 Yes, guys, it is the only place in our code, where we
698 may make it not affecting IPv4.
699 The rest of code is protocol independent,
700 and I do not like idea to uglify IPv4.
701
702 Actually, all the idea behind IPV6_PKTOPTIONS
703 looks not very well thought. For now we latch
704 options, received in the last packet, enqueued
705 by tcp. Feel free to propose better solution.
706 --ANK (980728)
707 */
708 if (np->rxopt.all)
709 /*
710 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
711 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
712 */
713 opt_skb = skb_clone(skb, GFP_ATOMIC);
714
715 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
716 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
717 goto reset;
718 if (opt_skb) {
719 /* XXX This is where we would goto ipv6_pktoptions. */
720 __kfree_skb(opt_skb);
721 }
722 return 0;
723 }
724
725 /*
726 * Step 3: Process LISTEN state
727 * If S.state == LISTEN,
728 * If P.type == Request or P contains a valid Init Cookie option,
729 * (* Must scan the packet's options to check for Init
730 * Cookies. Only Init Cookies are processed here,
731 * however; other options are processed in Step 8. This
732 * scan need only be performed if the endpoint uses Init
733 * Cookies *)
734 * (* Generate a new socket and switch to that socket *)
735 * Set S := new socket for this port pair
736 * S.state = RESPOND
737 * Choose S.ISS (initial seqno) or set from Init Cookies
738 * Initialize S.GAR := S.ISS
739 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
740 * Continue with S.state == RESPOND
741 * (* A Response packet will be generated in Step 11 *)
742 * Otherwise,
743 * Generate Reset(No Connection) unless P.type == Reset
744 * Drop packet and return
745 *
746 * NOTE: the check for the packet types is done in
747 * dccp_rcv_state_process
748 */
749 if (sk->sk_state == DCCP_LISTEN) {
750 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
751
752 if (nsk == NULL)
753 goto discard;
754 /*
755 * Queue it on the new socket if the new socket is active,
756 * otherwise we just shortcircuit this and continue with
757 * the new socket..
758 */
759 if (nsk != sk) {
760 if (dccp_child_process(sk, nsk, skb))
761 goto reset;
762 if (opt_skb != NULL)
763 __kfree_skb(opt_skb);
764 return 0;
765 }
766 }
767
768 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
769 goto reset;
770 if (opt_skb) {
771 /* XXX This is where we would goto ipv6_pktoptions. */
772 __kfree_skb(opt_skb);
773 }
774 return 0;
775
776 reset:
777 dccp_v6_ctl_send_reset(sk, skb);
778 discard:
779 if (opt_skb != NULL)
780 __kfree_skb(opt_skb);
781 kfree_skb(skb);
782 return 0;
783 }
784
785 static int dccp_v6_rcv(struct sk_buff *skb)
786 {
787 const struct dccp_hdr *dh;
788 struct sock *sk;
789 int min_cov;
790
791 /* Step 1: Check header basics */
792
793 if (dccp_invalid_packet(skb))
794 goto discard_it;
795
796 /* Step 1: If header checksum is incorrect, drop packet and return. */
797 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
798 &ipv6_hdr(skb)->daddr)) {
799 DCCP_WARN("dropped packet with invalid checksum\n");
800 goto discard_it;
801 }
802
803 dh = dccp_hdr(skb);
804
805 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
806 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
807
808 if (dccp_packet_without_ack(skb))
809 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
810 else
811 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
812
813 /* Step 2:
814 * Look up flow ID in table and get corresponding socket */
815 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
816 dh->dccph_sport, dh->dccph_dport);
817 /*
818 * Step 2:
819 * If no socket ...
820 */
821 if (sk == NULL) {
822 dccp_pr_debug("failed to look up flow ID in table and "
823 "get corresponding socket\n");
824 goto no_dccp_socket;
825 }
826
827 /*
828 * Step 2:
829 * ... or S.state == TIMEWAIT,
830 * Generate Reset(No Connection) unless P.type == Reset
831 * Drop packet and return
832 */
833 if (sk->sk_state == DCCP_TIME_WAIT) {
834 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
835 inet_twsk_put(inet_twsk(sk));
836 goto no_dccp_socket;
837 }
838
839 /*
840 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
841 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
842 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
843 */
844 min_cov = dccp_sk(sk)->dccps_pcrlen;
845 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
846 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
847 dh->dccph_cscov, min_cov);
848 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
849 goto discard_and_relse;
850 }
851
852 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
853 goto discard_and_relse;
854
855 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
856
857 no_dccp_socket:
858 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
859 goto discard_it;
860 /*
861 * Step 2:
862 * If no socket ...
863 * Generate Reset(No Connection) unless P.type == Reset
864 * Drop packet and return
865 */
866 if (dh->dccph_type != DCCP_PKT_RESET) {
867 DCCP_SKB_CB(skb)->dccpd_reset_code =
868 DCCP_RESET_CODE_NO_CONNECTION;
869 dccp_v6_ctl_send_reset(sk, skb);
870 }
871
872 discard_it:
873 kfree_skb(skb);
874 return 0;
875
876 discard_and_relse:
877 sock_put(sk);
878 goto discard_it;
879 }
880
881 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
882 int addr_len)
883 {
884 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
885 struct inet_connection_sock *icsk = inet_csk(sk);
886 struct inet_sock *inet = inet_sk(sk);
887 struct ipv6_pinfo *np = inet6_sk(sk);
888 struct dccp_sock *dp = dccp_sk(sk);
889 struct in6_addr *saddr = NULL, *final_p = NULL, final;
890 struct flowi fl;
891 struct dst_entry *dst;
892 int addr_type;
893 int err;
894
895 dp->dccps_role = DCCP_ROLE_CLIENT;
896
897 if (addr_len < SIN6_LEN_RFC2133)
898 return -EINVAL;
899
900 if (usin->sin6_family != AF_INET6)
901 return -EAFNOSUPPORT;
902
903 memset(&fl, 0, sizeof(fl));
904
905 if (np->sndflow) {
906 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
907 IP6_ECN_flow_init(fl.fl6_flowlabel);
908 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
909 struct ip6_flowlabel *flowlabel;
910 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
911 if (flowlabel == NULL)
912 return -EINVAL;
913 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
914 fl6_sock_release(flowlabel);
915 }
916 }
917 /*
918 * connect() to INADDR_ANY means loopback (BSD'ism).
919 */
920 if (ipv6_addr_any(&usin->sin6_addr))
921 usin->sin6_addr.s6_addr[15] = 1;
922
923 addr_type = ipv6_addr_type(&usin->sin6_addr);
924
925 if (addr_type & IPV6_ADDR_MULTICAST)
926 return -ENETUNREACH;
927
928 if (addr_type & IPV6_ADDR_LINKLOCAL) {
929 if (addr_len >= sizeof(struct sockaddr_in6) &&
930 usin->sin6_scope_id) {
931 /* If interface is set while binding, indices
932 * must coincide.
933 */
934 if (sk->sk_bound_dev_if &&
935 sk->sk_bound_dev_if != usin->sin6_scope_id)
936 return -EINVAL;
937
938 sk->sk_bound_dev_if = usin->sin6_scope_id;
939 }
940
941 /* Connect to link-local address requires an interface */
942 if (!sk->sk_bound_dev_if)
943 return -EINVAL;
944 }
945
946 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
947 np->flow_label = fl.fl6_flowlabel;
948
949 /*
950 * DCCP over IPv4
951 */
952 if (addr_type == IPV6_ADDR_MAPPED) {
953 u32 exthdrlen = icsk->icsk_ext_hdr_len;
954 struct sockaddr_in sin;
955
956 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
957
958 if (__ipv6_only_sock(sk))
959 return -ENETUNREACH;
960
961 sin.sin_family = AF_INET;
962 sin.sin_port = usin->sin6_port;
963 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
964
965 icsk->icsk_af_ops = &dccp_ipv6_mapped;
966 sk->sk_backlog_rcv = dccp_v4_do_rcv;
967
968 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
969 if (err) {
970 icsk->icsk_ext_hdr_len = exthdrlen;
971 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
972 sk->sk_backlog_rcv = dccp_v6_do_rcv;
973 goto failure;
974 }
975 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
976 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
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->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(sock_net(sk), &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->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->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->inet_sport,
1041 inet->inet_dport);
1042 err = dccp_connect(sk);
1043 if (err)
1044 goto late_failure;
1045
1046 return 0;
1047
1048 late_failure:
1049 dccp_set_state(sk, DCCP_CLOSED);
1050 __sk_dst_reset(sk);
1051 failure:
1052 inet->inet_dport = 0;
1053 sk->sk_route_caps = 0;
1054 return err;
1055 }
1056
1057 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1058 .queue_xmit = inet6_csk_xmit,
1059 .send_check = dccp_v6_send_check,
1060 .rebuild_header = inet6_sk_rebuild_header,
1061 .conn_request = dccp_v6_conn_request,
1062 .syn_recv_sock = dccp_v6_request_recv_sock,
1063 .net_header_len = sizeof(struct ipv6hdr),
1064 .setsockopt = ipv6_setsockopt,
1065 .getsockopt = ipv6_getsockopt,
1066 .addr2sockaddr = inet6_csk_addr2sockaddr,
1067 .sockaddr_len = sizeof(struct sockaddr_in6),
1068 .bind_conflict = inet6_csk_bind_conflict,
1069 #ifdef CONFIG_COMPAT
1070 .compat_setsockopt = compat_ipv6_setsockopt,
1071 .compat_getsockopt = compat_ipv6_getsockopt,
1072 #endif
1073 };
1074
1075 /*
1076 * DCCP over IPv4 via INET6 API
1077 */
1078 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1079 .queue_xmit = ip_queue_xmit,
1080 .send_check = dccp_v4_send_check,
1081 .rebuild_header = inet_sk_rebuild_header,
1082 .conn_request = dccp_v6_conn_request,
1083 .syn_recv_sock = dccp_v6_request_recv_sock,
1084 .net_header_len = sizeof(struct iphdr),
1085 .setsockopt = ipv6_setsockopt,
1086 .getsockopt = ipv6_getsockopt,
1087 .addr2sockaddr = inet6_csk_addr2sockaddr,
1088 .sockaddr_len = sizeof(struct sockaddr_in6),
1089 #ifdef CONFIG_COMPAT
1090 .compat_setsockopt = compat_ipv6_setsockopt,
1091 .compat_getsockopt = compat_ipv6_getsockopt,
1092 #endif
1093 };
1094
1095 /* NOTE: A lot of things set to zero explicitly by call to
1096 * sk_alloc() so need not be done here.
1097 */
1098 static int dccp_v6_init_sock(struct sock *sk)
1099 {
1100 static __u8 dccp_v6_ctl_sock_initialized;
1101 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1102
1103 if (err == 0) {
1104 if (unlikely(!dccp_v6_ctl_sock_initialized))
1105 dccp_v6_ctl_sock_initialized = 1;
1106 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1107 }
1108
1109 return err;
1110 }
1111
1112 static void dccp_v6_destroy_sock(struct sock *sk)
1113 {
1114 dccp_destroy_sock(sk);
1115 inet6_destroy_sock(sk);
1116 }
1117
1118 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1119 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1120 };
1121
1122 static struct proto dccp_v6_prot = {
1123 .name = "DCCPv6",
1124 .owner = THIS_MODULE,
1125 .close = dccp_close,
1126 .connect = dccp_v6_connect,
1127 .disconnect = dccp_disconnect,
1128 .ioctl = dccp_ioctl,
1129 .init = dccp_v6_init_sock,
1130 .setsockopt = dccp_setsockopt,
1131 .getsockopt = dccp_getsockopt,
1132 .sendmsg = dccp_sendmsg,
1133 .recvmsg = dccp_recvmsg,
1134 .backlog_rcv = dccp_v6_do_rcv,
1135 .hash = dccp_v6_hash,
1136 .unhash = inet_unhash,
1137 .accept = inet_csk_accept,
1138 .get_port = inet_csk_get_port,
1139 .shutdown = dccp_shutdown,
1140 .destroy = dccp_v6_destroy_sock,
1141 .orphan_count = &dccp_orphan_count,
1142 .max_header = MAX_DCCP_HEADER,
1143 .obj_size = sizeof(struct dccp6_sock),
1144 .slab_flags = SLAB_DESTROY_BY_RCU,
1145 .rsk_prot = &dccp6_request_sock_ops,
1146 .twsk_prot = &dccp6_timewait_sock_ops,
1147 .h.hashinfo = &dccp_hashinfo,
1148 #ifdef CONFIG_COMPAT
1149 .compat_setsockopt = compat_dccp_setsockopt,
1150 .compat_getsockopt = compat_dccp_getsockopt,
1151 #endif
1152 };
1153
1154 static const struct inet6_protocol dccp_v6_protocol = {
1155 .handler = dccp_v6_rcv,
1156 .err_handler = dccp_v6_err,
1157 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1158 };
1159
1160 static const struct proto_ops inet6_dccp_ops = {
1161 .family = PF_INET6,
1162 .owner = THIS_MODULE,
1163 .release = inet6_release,
1164 .bind = inet6_bind,
1165 .connect = inet_stream_connect,
1166 .socketpair = sock_no_socketpair,
1167 .accept = inet_accept,
1168 .getname = inet6_getname,
1169 .poll = dccp_poll,
1170 .ioctl = inet6_ioctl,
1171 .listen = inet_dccp_listen,
1172 .shutdown = inet_shutdown,
1173 .setsockopt = sock_common_setsockopt,
1174 .getsockopt = sock_common_getsockopt,
1175 .sendmsg = inet_sendmsg,
1176 .recvmsg = sock_common_recvmsg,
1177 .mmap = sock_no_mmap,
1178 .sendpage = sock_no_sendpage,
1179 #ifdef CONFIG_COMPAT
1180 .compat_setsockopt = compat_sock_common_setsockopt,
1181 .compat_getsockopt = compat_sock_common_getsockopt,
1182 #endif
1183 };
1184
1185 static struct inet_protosw dccp_v6_protosw = {
1186 .type = SOCK_DCCP,
1187 .protocol = IPPROTO_DCCP,
1188 .prot = &dccp_v6_prot,
1189 .ops = &inet6_dccp_ops,
1190 .flags = INET_PROTOSW_ICSK,
1191 };
1192
1193 static int __net_init dccp_v6_init_net(struct net *net)
1194 {
1195 if (dccp_hashinfo.bhash == NULL)
1196 return -ESOCKTNOSUPPORT;
1197
1198 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1199 SOCK_DCCP, IPPROTO_DCCP, net);
1200 }
1201
1202 static void __net_exit dccp_v6_exit_net(struct net *net)
1203 {
1204 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1205 }
1206
1207 static struct pernet_operations dccp_v6_ops = {
1208 .init = dccp_v6_init_net,
1209 .exit = dccp_v6_exit_net,
1210 };
1211
1212 static int __init dccp_v6_init(void)
1213 {
1214 int err = proto_register(&dccp_v6_prot, 1);
1215
1216 if (err != 0)
1217 goto out;
1218
1219 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1220 if (err != 0)
1221 goto out_unregister_proto;
1222
1223 inet6_register_protosw(&dccp_v6_protosw);
1224
1225 err = register_pernet_subsys(&dccp_v6_ops);
1226 if (err != 0)
1227 goto out_destroy_ctl_sock;
1228 out:
1229 return err;
1230
1231 out_destroy_ctl_sock:
1232 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1233 inet6_unregister_protosw(&dccp_v6_protosw);
1234 out_unregister_proto:
1235 proto_unregister(&dccp_v6_prot);
1236 goto out;
1237 }
1238
1239 static void __exit dccp_v6_exit(void)
1240 {
1241 unregister_pernet_subsys(&dccp_v6_ops);
1242 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1243 inet6_unregister_protosw(&dccp_v6_protosw);
1244 proto_unregister(&dccp_v6_prot);
1245 }
1246
1247 module_init(dccp_v6_init);
1248 module_exit(dccp_v6_exit);
1249
1250 /*
1251 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1252 * values directly, Also cover the case where the protocol is not specified,
1253 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1254 */
1255 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1256 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1257 MODULE_LICENSE("GPL");
1258 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1259 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree