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init from v2.6.32.60
[mach-moxart.git] / net / dccp / ipv6.c
blob9ed19628da48c798512782c97e7c6027f93c2070
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 #include <net/secure_seq.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);
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 __u64 dccp_v6_init_sequence(struct sk_buff *skb)
74 {
75 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
76 ipv6_hdr(skb)->saddr.s6_addr32,
77 dccp_hdr(skb)->dccph_dport,
78 dccp_hdr(skb)->dccph_sport );
79
80 }
81
82 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
83 u8 type, u8 code, int offset, __be32 info)
84 {
85 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
86 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
87 struct dccp_sock *dp;
88 struct ipv6_pinfo *np;
89 struct sock *sk;
90 int err;
91 __u64 seq;
92 struct net *net = dev_net(skb->dev);
93
94 if (skb->len < offset + sizeof(*dh) ||
95 skb->len < offset + __dccp_basic_hdr_len(dh)) {
96 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
97 ICMP6_MIB_INERRORS);
98 return;
99 }
100
101 sk = inet6_lookup(net, &dccp_hashinfo,
102 &hdr->daddr, dh->dccph_dport,
103 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
104
105 if (sk == NULL) {
106 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
107 ICMP6_MIB_INERRORS);
108 return;
109 }
110
111 if (sk->sk_state == DCCP_TIME_WAIT) {
112 inet_twsk_put(inet_twsk(sk));
113 return;
114 }
115
116 bh_lock_sock(sk);
117 if (sock_owned_by_user(sk))
118 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
119
120 if (sk->sk_state == DCCP_CLOSED)
121 goto out;
122
123 dp = dccp_sk(sk);
124 seq = dccp_hdr_seq(dh);
125 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
126 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
127 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
128 goto out;
129 }
130
131 np = inet6_sk(sk);
132
133 if (type == ICMPV6_PKT_TOOBIG) {
134 struct dst_entry *dst = NULL;
135
136 if (sock_owned_by_user(sk))
137 goto out;
138 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
139 goto out;
140
141 /* icmp should have updated the destination cache entry */
142 dst = __sk_dst_check(sk, np->dst_cookie);
143 if (dst == NULL) {
144 struct inet_sock *inet = inet_sk(sk);
145 struct flowi fl;
146
147 /* BUGGG_FUTURE: Again, it is not clear how
148 to handle rthdr case. Ignore this complexity
149 for now.
150 */
151 memset(&fl, 0, sizeof(fl));
152 fl.proto = IPPROTO_DCCP;
153 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
154 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
155 fl.oif = sk->sk_bound_dev_if;
156 fl.fl_ip_dport = inet->dport;
157 fl.fl_ip_sport = inet->sport;
158 security_sk_classify_flow(sk, &fl);
159
160 err = ip6_dst_lookup(sk, &dst, &fl);
161 if (err) {
162 sk->sk_err_soft = -err;
163 goto out;
164 }
165
166 err = xfrm_lookup(net, &dst, &fl, sk, 0);
167 if (err < 0) {
168 sk->sk_err_soft = -err;
169 goto out;
170 }
171 } else
172 dst_hold(dst);
173
174 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
175 dccp_sync_mss(sk, dst_mtu(dst));
176 } /* else let the usual retransmit timer handle it */
177 dst_release(dst);
178 goto out;
179 }
180
181 icmpv6_err_convert(type, code, &err);
182
183 /* Might be for an request_sock */
184 switch (sk->sk_state) {
185 struct request_sock *req, **prev;
186 case DCCP_LISTEN:
187 if (sock_owned_by_user(sk))
188 goto out;
189
190 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
191 &hdr->daddr, &hdr->saddr,
192 inet6_iif(skb));
193 if (req == NULL)
194 goto out;
195
196 /*
197 * ICMPs are not backlogged, hence we cannot get an established
198 * socket here.
199 */
200 WARN_ON(req->sk != NULL);
201
202 if (seq != dccp_rsk(req)->dreq_iss) {
203 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
204 goto out;
205 }
206
207 inet_csk_reqsk_queue_drop(sk, req, prev);
208 goto out;
209
210 case DCCP_REQUESTING:
211 case DCCP_RESPOND: /* Cannot happen.
212 It can, it SYNs are crossed. --ANK */
213 if (!sock_owned_by_user(sk)) {
214 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
215 sk->sk_err = err;
216 /*
217 * Wake people up to see the error
218 * (see connect in sock.c)
219 */
220 sk->sk_error_report(sk);
221 dccp_done(sk);
222 } else
223 sk->sk_err_soft = err;
224 goto out;
225 }
226
227 if (!sock_owned_by_user(sk) && np->recverr) {
228 sk->sk_err = err;
229 sk->sk_error_report(sk);
230 } else
231 sk->sk_err_soft = err;
232
233 out:
234 bh_unlock_sock(sk);
235 sock_put(sk);
236 }
237
238
239 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
240 {
241 struct inet6_request_sock *ireq6 = inet6_rsk(req);
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 struct sk_buff *skb;
244 struct ipv6_txoptions *opt = NULL;
245 struct in6_addr *final_p = NULL, final;
246 struct flowi fl;
247 int err = -1;
248 struct dst_entry *dst;
249
250 memset(&fl, 0, sizeof(fl));
251 fl.proto = IPPROTO_DCCP;
252 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
253 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
254 fl.fl6_flowlabel = 0;
255 fl.oif = ireq6->iif;
256 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
257 fl.fl_ip_sport = inet_rsk(req)->loc_port;
258 security_req_classify_flow(req, &fl);
259
260 opt = np->opt;
261
262 if (opt != NULL && opt->srcrt != NULL) {
263 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
264
265 ipv6_addr_copy(&final, &fl.fl6_dst);
266 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
267 final_p = &final;
268 }
269
270 err = ip6_dst_lookup(sk, &dst, &fl);
271 if (err)
272 goto done;
273
274 if (final_p)
275 ipv6_addr_copy(&fl.fl6_dst, final_p);
276
277 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
278 if (err < 0)
279 goto done;
280
281 skb = dccp_make_response(sk, dst, req);
282 if (skb != NULL) {
283 struct dccp_hdr *dh = dccp_hdr(skb);
284
285 dh->dccph_checksum = dccp_v6_csum_finish(skb,
286 &ireq6->loc_addr,
287 &ireq6->rmt_addr);
288 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
289 err = ip6_xmit(sk, skb, &fl, opt, 0);
290 err = net_xmit_eval(err);
291 }
292
293 done:
294 if (opt != NULL && opt != np->opt)
295 sock_kfree_s(sk, opt, opt->tot_len);
296 dst_release(dst);
297 return err;
298 }
299
300 static void dccp_v6_reqsk_destructor(struct request_sock *req)
301 {
302 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
303 if (inet6_rsk(req)->pktopts != NULL)
304 kfree_skb(inet6_rsk(req)->pktopts);
305 }
306
307 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
308 {
309 struct ipv6hdr *rxip6h;
310 struct sk_buff *skb;
311 struct flowi fl;
312 struct net *net = dev_net(skb_dst(rxskb)->dev);
313 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
314 struct dst_entry *dst;
315
316 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
317 return;
318
319 if (!ipv6_unicast_destination(rxskb))
320 return;
321
322 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
323 if (skb == NULL)
324 return;
325
326 rxip6h = ipv6_hdr(rxskb);
327 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
328 &rxip6h->daddr);
329
330 memset(&fl, 0, sizeof(fl));
331 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
332 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
333
334 fl.proto = IPPROTO_DCCP;
335 fl.oif = inet6_iif(rxskb);
336 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
337 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
338 security_skb_classify_flow(rxskb, &fl);
339
340 /* sk = NULL, but it is safe for now. RST socket required. */
341 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
342 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
343 skb_dst_set(skb, dst);
344 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
345 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
346 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
347 return;
348 }
349 }
350
351 kfree_skb(skb);
352 }
353
354 static struct request_sock_ops dccp6_request_sock_ops = {
355 .family = AF_INET6,
356 .obj_size = sizeof(struct dccp6_request_sock),
357 .rtx_syn_ack = dccp_v6_send_response,
358 .send_ack = dccp_reqsk_send_ack,
359 .destructor = dccp_v6_reqsk_destructor,
360 .send_reset = dccp_v6_ctl_send_reset,
361 };
362
363 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
364 {
365 const struct dccp_hdr *dh = dccp_hdr(skb);
366 const struct ipv6hdr *iph = ipv6_hdr(skb);
367 struct sock *nsk;
368 struct request_sock **prev;
369 /* Find possible connection requests. */
370 struct request_sock *req = inet6_csk_search_req(sk, &prev,
371 dh->dccph_sport,
372 &iph->saddr,
373 &iph->daddr,
374 inet6_iif(skb));
375 if (req != NULL)
376 return dccp_check_req(sk, skb, req, prev);
377
378 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
379 &iph->saddr, dh->dccph_sport,
380 &iph->daddr, ntohs(dh->dccph_dport),
381 inet6_iif(skb));
382 if (nsk != NULL) {
383 if (nsk->sk_state != DCCP_TIME_WAIT) {
384 bh_lock_sock(nsk);
385 return nsk;
386 }
387 inet_twsk_put(inet_twsk(nsk));
388 return NULL;
389 }
390
391 return sk;
392 }
393
394 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
395 {
396 struct request_sock *req;
397 struct dccp_request_sock *dreq;
398 struct inet6_request_sock *ireq6;
399 struct ipv6_pinfo *np = inet6_sk(sk);
400 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
401 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
402
403 if (skb->protocol == htons(ETH_P_IP))
404 return dccp_v4_conn_request(sk, skb);
405
406 if (!ipv6_unicast_destination(skb))
407 return 0; /* discard, don't send a reset here */
408
409 if (dccp_bad_service_code(sk, service)) {
410 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
411 goto drop;
412 }
413 /*
414 * There are no SYN attacks on IPv6, yet...
415 */
416 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
417 if (inet_csk_reqsk_queue_is_full(sk))
418 goto drop;
419
420 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
421 goto drop;
422
423 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
424 if (req == NULL)
425 goto drop;
426
427 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
428 goto drop_and_free;
429
430 dreq = dccp_rsk(req);
431 if (dccp_parse_options(sk, dreq, skb))
432 goto drop_and_free;
433
434 if (security_inet_conn_request(sk, skb, req))
435 goto drop_and_free;
436
437 ireq6 = inet6_rsk(req);
438 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
439 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
440
441 if (ipv6_opt_accepted(sk, skb) ||
442 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
443 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
444 atomic_inc(&skb->users);
445 ireq6->pktopts = skb;
446 }
447 ireq6->iif = sk->sk_bound_dev_if;
448
449 /* So that link locals have meaning */
450 if (!sk->sk_bound_dev_if &&
451 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
452 ireq6->iif = inet6_iif(skb);
453
454 /*
455 * Step 3: Process LISTEN state
456 *
457 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
458 *
459 * In fact we defer setting S.GSR, S.SWL, S.SWH to
460 * dccp_create_openreq_child.
461 */
462 dreq->dreq_isr = dcb->dccpd_seq;
463 dreq->dreq_iss = dccp_v6_init_sequence(skb);
464 dreq->dreq_service = service;
465
466 if (dccp_v6_send_response(sk, req))
467 goto drop_and_free;
468
469 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
470 return 0;
471
472 drop_and_free:
473 reqsk_free(req);
474 drop:
475 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
476 return -1;
477 }
478
479 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
480 struct sk_buff *skb,
481 struct request_sock *req,
482 struct dst_entry *dst)
483 {
484 struct inet6_request_sock *ireq6 = inet6_rsk(req);
485 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
486 struct inet_sock *newinet;
487 struct dccp_sock *newdp;
488 struct dccp6_sock *newdp6;
489 struct sock *newsk;
490 struct ipv6_txoptions *opt;
491
492 if (skb->protocol == htons(ETH_P_IP)) {
493 /*
494 * v6 mapped
495 */
496 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
497 if (newsk == NULL)
498 return NULL;
499
500 newdp6 = (struct dccp6_sock *)newsk;
501 newdp = dccp_sk(newsk);
502 newinet = inet_sk(newsk);
503 newinet->pinet6 = &newdp6->inet6;
504 newnp = inet6_sk(newsk);
505
506 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
507
508 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
509 newinet->daddr);
510
511 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
512 newinet->saddr);
513
514 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
515
516 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
517 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
518 newnp->pktoptions = NULL;
519 newnp->opt = NULL;
520 newnp->mcast_oif = inet6_iif(skb);
521 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
522
523 /*
524 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
525 * here, dccp_create_openreq_child now does this for us, see the comment in
526 * that function for the gory details. -acme
527 */
528
529 /* It is tricky place. Until this moment IPv4 tcp
530 worked with IPv6 icsk.icsk_af_ops.
531 Sync it now.
532 */
533 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
534
535 return newsk;
536 }
537
538 opt = np->opt;
539
540 if (sk_acceptq_is_full(sk))
541 goto out_overflow;
542
543 if (dst == NULL) {
544 struct in6_addr *final_p = NULL, final;
545 struct flowi fl;
546
547 memset(&fl, 0, sizeof(fl));
548 fl.proto = IPPROTO_DCCP;
549 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
550 if (opt != NULL && opt->srcrt != NULL) {
551 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
552
553 ipv6_addr_copy(&final, &fl.fl6_dst);
554 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
555 final_p = &final;
556 }
557 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
558 fl.oif = sk->sk_bound_dev_if;
559 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
560 fl.fl_ip_sport = inet_rsk(req)->loc_port;
561 security_sk_classify_flow(sk, &fl);
562
563 if (ip6_dst_lookup(sk, &dst, &fl))
564 goto out;
565
566 if (final_p)
567 ipv6_addr_copy(&fl.fl6_dst, final_p);
568
569 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
570 goto out;
571 }
572
573 newsk = dccp_create_openreq_child(sk, req, skb);
574 if (newsk == NULL)
575 goto out;
576
577 /*
578 * No need to charge this sock to the relevant IPv6 refcnt debug socks
579 * count here, dccp_create_openreq_child now does this for us, see the
580 * comment in that function for the gory details. -acme
581 */
582
583 __ip6_dst_store(newsk, dst, NULL, NULL);
584 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
585 NETIF_F_TSO);
586 newdp6 = (struct dccp6_sock *)newsk;
587 newinet = inet_sk(newsk);
588 newinet->pinet6 = &newdp6->inet6;
589 newdp = dccp_sk(newsk);
590 newnp = inet6_sk(newsk);
591
592 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
593
594 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
595 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
596 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
597 newsk->sk_bound_dev_if = ireq6->iif;
598
599 /* Now IPv6 options...
600
601 First: no IPv4 options.
602 */
603 newinet->opt = NULL;
604
605 /* Clone RX bits */
606 newnp->rxopt.all = np->rxopt.all;
607
608 /* Clone pktoptions received with SYN */
609 newnp->pktoptions = NULL;
610 if (ireq6->pktopts != NULL) {
611 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
612 kfree_skb(ireq6->pktopts);
613 ireq6->pktopts = NULL;
614 if (newnp->pktoptions)
615 skb_set_owner_r(newnp->pktoptions, newsk);
616 }
617 newnp->opt = NULL;
618 newnp->mcast_oif = inet6_iif(skb);
619 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
620
621 /*
622 * Clone native IPv6 options from listening socket (if any)
623 *
624 * Yes, keeping reference count would be much more clever, but we make
625 * one more one thing there: reattach optmem to newsk.
626 */
627 if (opt != NULL) {
628 newnp->opt = ipv6_dup_options(newsk, opt);
629 if (opt != np->opt)
630 sock_kfree_s(sk, opt, opt->tot_len);
631 }
632
633 inet_csk(newsk)->icsk_ext_hdr_len = 0;
634 if (newnp->opt != NULL)
635 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
636 newnp->opt->opt_flen);
637
638 dccp_sync_mss(newsk, dst_mtu(dst));
639
640 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
641
642 __inet6_hash(newsk);
643 __inet_inherit_port(sk, newsk);
644
645 return newsk;
646
647 out_overflow:
648 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
649 out:
650 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
651 if (opt != NULL && opt != np->opt)
652 sock_kfree_s(sk, opt, opt->tot_len);
653 dst_release(dst);
654 return NULL;
655 }
656
657 /* The socket must have it's spinlock held when we get
658 * here.
659 *
660 * We have a potential double-lock case here, so even when
661 * doing backlog processing we use the BH locking scheme.
662 * This is because we cannot sleep with the original spinlock
663 * held.
664 */
665 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
666 {
667 struct ipv6_pinfo *np = inet6_sk(sk);
668 struct sk_buff *opt_skb = NULL;
669
670 /* Imagine: socket is IPv6. IPv4 packet arrives,
671 goes to IPv4 receive handler and backlogged.
672 From backlog it always goes here. Kerboom...
673 Fortunately, dccp_rcv_established and rcv_established
674 handle them correctly, but it is not case with
675 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
676 */
677
678 if (skb->protocol == htons(ETH_P_IP))
679 return dccp_v4_do_rcv(sk, skb);
680
681 if (sk_filter(sk, skb))
682 goto discard;
683
684 /*
685 * socket locking is here for SMP purposes as backlog rcv is currently
686 * called with bh processing disabled.
687 */
688
689 /* Do Stevens' IPV6_PKTOPTIONS.
690
691 Yes, guys, it is the only place in our code, where we
692 may make it not affecting IPv4.
693 The rest of code is protocol independent,
694 and I do not like idea to uglify IPv4.
695
696 Actually, all the idea behind IPV6_PKTOPTIONS
697 looks not very well thought. For now we latch
698 options, received in the last packet, enqueued
699 by tcp. Feel free to propose better solution.
700 --ANK (980728)
701 */
702 if (np->rxopt.all)
703 /*
704 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
705 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
706 */
707 opt_skb = skb_clone(skb, GFP_ATOMIC);
708
709 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
710 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
711 goto reset;
712 if (opt_skb) {
713 /* XXX This is where we would goto ipv6_pktoptions. */
714 __kfree_skb(opt_skb);
715 }
716 return 0;
717 }
718
719 /*
720 * Step 3: Process LISTEN state
721 * If S.state == LISTEN,
722 * If P.type == Request or P contains a valid Init Cookie option,
723 * (* Must scan the packet's options to check for Init
724 * Cookies. Only Init Cookies are processed here,
725 * however; other options are processed in Step 8. This
726 * scan need only be performed if the endpoint uses Init
727 * Cookies *)
728 * (* Generate a new socket and switch to that socket *)
729 * Set S := new socket for this port pair
730 * S.state = RESPOND
731 * Choose S.ISS (initial seqno) or set from Init Cookies
732 * Initialize S.GAR := S.ISS
733 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
734 * Continue with S.state == RESPOND
735 * (* A Response packet will be generated in Step 11 *)
736 * Otherwise,
737 * Generate Reset(No Connection) unless P.type == Reset
738 * Drop packet and return
739 *
740 * NOTE: the check for the packet types is done in
741 * dccp_rcv_state_process
742 */
743 if (sk->sk_state == DCCP_LISTEN) {
744 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
745
746 if (nsk == NULL)
747 goto discard;
748 /*
749 * Queue it on the new socket if the new socket is active,
750 * otherwise we just shortcircuit this and continue with
751 * the new socket..
752 */
753 if (nsk != sk) {
754 if (dccp_child_process(sk, nsk, skb))
755 goto reset;
756 if (opt_skb != NULL)
757 __kfree_skb(opt_skb);
758 return 0;
759 }
760 }
761
762 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
763 goto reset;
764 if (opt_skb) {
765 /* XXX This is where we would goto ipv6_pktoptions. */
766 __kfree_skb(opt_skb);
767 }
768 return 0;
769
770 reset:
771 dccp_v6_ctl_send_reset(sk, skb);
772 discard:
773 if (opt_skb != NULL)
774 __kfree_skb(opt_skb);
775 kfree_skb(skb);
776 return 0;
777 }
778
779 static int dccp_v6_rcv(struct sk_buff *skb)
780 {
781 const struct dccp_hdr *dh;
782 struct sock *sk;
783 int min_cov;
784
785 /* Step 1: Check header basics */
786
787 if (dccp_invalid_packet(skb))
788 goto discard_it;
789
790 /* Step 1: If header checksum is incorrect, drop packet and return. */
791 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
792 &ipv6_hdr(skb)->daddr)) {
793 DCCP_WARN("dropped packet with invalid checksum\n");
794 goto discard_it;
795 }
796
797 dh = dccp_hdr(skb);
798
799 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
800 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
801
802 if (dccp_packet_without_ack(skb))
803 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
804 else
805 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
806
807 /* Step 2:
808 * Look up flow ID in table and get corresponding socket */
809 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
810 dh->dccph_sport, dh->dccph_dport);
811 /*
812 * Step 2:
813 * If no socket ...
814 */
815 if (sk == NULL) {
816 dccp_pr_debug("failed to look up flow ID in table and "
817 "get corresponding socket\n");
818 goto no_dccp_socket;
819 }
820
821 /*
822 * Step 2:
823 * ... or S.state == TIMEWAIT,
824 * Generate Reset(No Connection) unless P.type == Reset
825 * Drop packet and return
826 */
827 if (sk->sk_state == DCCP_TIME_WAIT) {
828 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
829 inet_twsk_put(inet_twsk(sk));
830 goto no_dccp_socket;
831 }
832
833 /*
834 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
835 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
836 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
837 */
838 min_cov = dccp_sk(sk)->dccps_pcrlen;
839 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
840 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
841 dh->dccph_cscov, min_cov);
842 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
843 goto discard_and_relse;
844 }
845
846 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
847 goto discard_and_relse;
848
849 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
850
851 no_dccp_socket:
852 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
853 goto discard_it;
854 /*
855 * Step 2:
856 * If no socket ...
857 * Generate Reset(No Connection) unless P.type == Reset
858 * Drop packet and return
859 */
860 if (dh->dccph_type != DCCP_PKT_RESET) {
861 DCCP_SKB_CB(skb)->dccpd_reset_code =
862 DCCP_RESET_CODE_NO_CONNECTION;
863 dccp_v6_ctl_send_reset(sk, skb);
864 }
865
866 discard_it:
867 kfree_skb(skb);
868 return 0;
869
870 discard_and_relse:
871 sock_put(sk);
872 goto discard_it;
873 }
874
875 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
876 int addr_len)
877 {
878 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
879 struct inet_connection_sock *icsk = inet_csk(sk);
880 struct inet_sock *inet = inet_sk(sk);
881 struct ipv6_pinfo *np = inet6_sk(sk);
882 struct dccp_sock *dp = dccp_sk(sk);
883 struct in6_addr *saddr = NULL, *final_p = NULL, final;
884 struct flowi fl;
885 struct dst_entry *dst;
886 int addr_type;
887 int err;
888
889 dp->dccps_role = DCCP_ROLE_CLIENT;
890
891 if (addr_len < SIN6_LEN_RFC2133)
892 return -EINVAL;
893
894 if (usin->sin6_family != AF_INET6)
895 return -EAFNOSUPPORT;
896
897 memset(&fl, 0, sizeof(fl));
898
899 if (np->sndflow) {
900 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
901 IP6_ECN_flow_init(fl.fl6_flowlabel);
902 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
903 struct ip6_flowlabel *flowlabel;
904 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
905 if (flowlabel == NULL)
906 return -EINVAL;
907 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
908 fl6_sock_release(flowlabel);
909 }
910 }
911 /*
912 * connect() to INADDR_ANY means loopback (BSD'ism).
913 */
914 if (ipv6_addr_any(&usin->sin6_addr))
915 usin->sin6_addr.s6_addr[15] = 1;
916
917 addr_type = ipv6_addr_type(&usin->sin6_addr);
918
919 if (addr_type & IPV6_ADDR_MULTICAST)
920 return -ENETUNREACH;
921
922 if (addr_type & IPV6_ADDR_LINKLOCAL) {
923 if (addr_len >= sizeof(struct sockaddr_in6) &&
924 usin->sin6_scope_id) {
925 /* If interface is set while binding, indices
926 * must coincide.
927 */
928 if (sk->sk_bound_dev_if &&
929 sk->sk_bound_dev_if != usin->sin6_scope_id)
930 return -EINVAL;
931
932 sk->sk_bound_dev_if = usin->sin6_scope_id;
933 }
934
935 /* Connect to link-local address requires an interface */
936 if (!sk->sk_bound_dev_if)
937 return -EINVAL;
938 }
939
940 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
941 np->flow_label = fl.fl6_flowlabel;
942
943 /*
944 * DCCP over IPv4
945 */
946 if (addr_type == IPV6_ADDR_MAPPED) {
947 u32 exthdrlen = icsk->icsk_ext_hdr_len;
948 struct sockaddr_in sin;
949
950 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
951
952 if (__ipv6_only_sock(sk))
953 return -ENETUNREACH;
954
955 sin.sin_family = AF_INET;
956 sin.sin_port = usin->sin6_port;
957 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
958
959 icsk->icsk_af_ops = &dccp_ipv6_mapped;
960 sk->sk_backlog_rcv = dccp_v4_do_rcv;
961
962 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
963 if (err) {
964 icsk->icsk_ext_hdr_len = exthdrlen;
965 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
966 sk->sk_backlog_rcv = dccp_v6_do_rcv;
967 goto failure;
968 } else {
969 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
970 inet->saddr);
971 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
972 inet->rcv_saddr);
973 }
974
975 return err;
976 }
977
978 if (!ipv6_addr_any(&np->rcv_saddr))
979 saddr = &np->rcv_saddr;
980
981 fl.proto = IPPROTO_DCCP;
982 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
983 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
984 fl.oif = sk->sk_bound_dev_if;
985 fl.fl_ip_dport = usin->sin6_port;
986 fl.fl_ip_sport = inet->sport;
987 security_sk_classify_flow(sk, &fl);
988
989 if (np->opt != NULL && np->opt->srcrt != NULL) {
990 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
991
992 ipv6_addr_copy(&final, &fl.fl6_dst);
993 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
994 final_p = &final;
995 }
996
997 err = ip6_dst_lookup(sk, &dst, &fl);
998 if (err)
999 goto failure;
1000
1001 if (final_p)
1002 ipv6_addr_copy(&fl.fl6_dst, final_p);
1003
1004 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1005 if (err < 0) {
1006 if (err == -EREMOTE)
1007 err = ip6_dst_blackhole(sk, &dst, &fl);
1008 if (err < 0)
1009 goto failure;
1010 }
1011
1012 if (saddr == NULL) {
1013 saddr = &fl.fl6_src;
1014 ipv6_addr_copy(&np->rcv_saddr, saddr);
1015 }
1016
1017 /* set the source address */
1018 ipv6_addr_copy(&np->saddr, saddr);
1019 inet->rcv_saddr = LOOPBACK4_IPV6;
1020
1021 __ip6_dst_store(sk, dst, NULL, NULL);
1022
1023 icsk->icsk_ext_hdr_len = 0;
1024 if (np->opt != NULL)
1025 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1026 np->opt->opt_nflen);
1027
1028 inet->dport = usin->sin6_port;
1029
1030 dccp_set_state(sk, DCCP_REQUESTING);
1031 err = inet6_hash_connect(&dccp_death_row, sk);
1032 if (err)
1033 goto late_failure;
1034
1035 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1036 np->daddr.s6_addr32,
1037 inet->sport, inet->dport);
1038 err = dccp_connect(sk);
1039 if (err)
1040 goto late_failure;
1041
1042 return 0;
1043
1044 late_failure:
1045 dccp_set_state(sk, DCCP_CLOSED);
1046 __sk_dst_reset(sk);
1047 failure:
1048 inet->dport = 0;
1049 sk->sk_route_caps = 0;
1050 return err;
1051 }
1052
1053 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1054 .queue_xmit = inet6_csk_xmit,
1055 .send_check = dccp_v6_send_check,
1056 .rebuild_header = inet6_sk_rebuild_header,
1057 .conn_request = dccp_v6_conn_request,
1058 .syn_recv_sock = dccp_v6_request_recv_sock,
1059 .net_header_len = sizeof(struct ipv6hdr),
1060 .setsockopt = ipv6_setsockopt,
1061 .getsockopt = ipv6_getsockopt,
1062 .addr2sockaddr = inet6_csk_addr2sockaddr,
1063 .sockaddr_len = sizeof(struct sockaddr_in6),
1064 .bind_conflict = inet6_csk_bind_conflict,
1065 #ifdef CONFIG_COMPAT
1066 .compat_setsockopt = compat_ipv6_setsockopt,
1067 .compat_getsockopt = compat_ipv6_getsockopt,
1068 #endif
1069 };
1070
1071 /*
1072 * DCCP over IPv4 via INET6 API
1073 */
1074 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1075 .queue_xmit = ip_queue_xmit,
1076 .send_check = dccp_v4_send_check,
1077 .rebuild_header = inet_sk_rebuild_header,
1078 .conn_request = dccp_v6_conn_request,
1079 .syn_recv_sock = dccp_v6_request_recv_sock,
1080 .net_header_len = sizeof(struct iphdr),
1081 .setsockopt = ipv6_setsockopt,
1082 .getsockopt = ipv6_getsockopt,
1083 .addr2sockaddr = inet6_csk_addr2sockaddr,
1084 .sockaddr_len = sizeof(struct sockaddr_in6),
1085 #ifdef CONFIG_COMPAT
1086 .compat_setsockopt = compat_ipv6_setsockopt,
1087 .compat_getsockopt = compat_ipv6_getsockopt,
1088 #endif
1089 };
1090
1091 /* NOTE: A lot of things set to zero explicitly by call to
1092 * sk_alloc() so need not be done here.
1093 */
1094 static int dccp_v6_init_sock(struct sock *sk)
1095 {
1096 static __u8 dccp_v6_ctl_sock_initialized;
1097 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1098
1099 if (err == 0) {
1100 if (unlikely(!dccp_v6_ctl_sock_initialized))
1101 dccp_v6_ctl_sock_initialized = 1;
1102 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1103 }
1104
1105 return err;
1106 }
1107
1108 static void dccp_v6_destroy_sock(struct sock *sk)
1109 {
1110 dccp_destroy_sock(sk);
1111 inet6_destroy_sock(sk);
1112 }
1113
1114 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1115 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1116 };
1117
1118 static struct proto dccp_v6_prot = {
1119 .name = "DCCPv6",
1120 .owner = THIS_MODULE,
1121 .close = dccp_close,
1122 .connect = dccp_v6_connect,
1123 .disconnect = dccp_disconnect,
1124 .ioctl = dccp_ioctl,
1125 .init = dccp_v6_init_sock,
1126 .setsockopt = dccp_setsockopt,
1127 .getsockopt = dccp_getsockopt,
1128 .sendmsg = dccp_sendmsg,
1129 .recvmsg = dccp_recvmsg,
1130 .backlog_rcv = dccp_v6_do_rcv,
1131 .hash = dccp_v6_hash,
1132 .unhash = inet_unhash,
1133 .accept = inet_csk_accept,
1134 .get_port = inet_csk_get_port,
1135 .shutdown = dccp_shutdown,
1136 .destroy = dccp_v6_destroy_sock,
1137 .orphan_count = &dccp_orphan_count,
1138 .max_header = MAX_DCCP_HEADER,
1139 .obj_size = sizeof(struct dccp6_sock),
1140 .slab_flags = SLAB_DESTROY_BY_RCU,
1141 .rsk_prot = &dccp6_request_sock_ops,
1142 .twsk_prot = &dccp6_timewait_sock_ops,
1143 .h.hashinfo = &dccp_hashinfo,
1144 #ifdef CONFIG_COMPAT
1145 .compat_setsockopt = compat_dccp_setsockopt,
1146 .compat_getsockopt = compat_dccp_getsockopt,
1147 #endif
1148 };
1149
1150 static const struct inet6_protocol dccp_v6_protocol = {
1151 .handler = dccp_v6_rcv,
1152 .err_handler = dccp_v6_err,
1153 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1154 };
1155
1156 static const struct proto_ops inet6_dccp_ops = {
1157 .family = PF_INET6,
1158 .owner = THIS_MODULE,
1159 .release = inet6_release,
1160 .bind = inet6_bind,
1161 .connect = inet_stream_connect,
1162 .socketpair = sock_no_socketpair,
1163 .accept = inet_accept,
1164 .getname = inet6_getname,
1165 .poll = dccp_poll,
1166 .ioctl = inet6_ioctl,
1167 .listen = inet_dccp_listen,
1168 .shutdown = inet_shutdown,
1169 .setsockopt = sock_common_setsockopt,
1170 .getsockopt = sock_common_getsockopt,
1171 .sendmsg = inet_sendmsg,
1172 .recvmsg = sock_common_recvmsg,
1173 .mmap = sock_no_mmap,
1174 .sendpage = sock_no_sendpage,
1175 #ifdef CONFIG_COMPAT
1176 .compat_setsockopt = compat_sock_common_setsockopt,
1177 .compat_getsockopt = compat_sock_common_getsockopt,
1178 #endif
1179 };
1180
1181 static struct inet_protosw dccp_v6_protosw = {
1182 .type = SOCK_DCCP,
1183 .protocol = IPPROTO_DCCP,
1184 .prot = &dccp_v6_prot,
1185 .ops = &inet6_dccp_ops,
1186 .capability = -1,
1187 .flags = INET_PROTOSW_ICSK,
1188 };
1189
1190 static int dccp_v6_init_net(struct net *net)
1191 {
1192 int err;
1193
1194 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1195 SOCK_DCCP, IPPROTO_DCCP, net);
1196 return err;
1197 }
1198
1199 static void dccp_v6_exit_net(struct net *net)
1200 {
1201 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1202 }
1203
1204 static struct pernet_operations dccp_v6_ops = {
1205 .init = dccp_v6_init_net,
1206 .exit = dccp_v6_exit_net,
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 = register_pernet_subsys(&dccp_v6_ops);
1223 if (err != 0)
1224 goto out_destroy_ctl_sock;
1225 out:
1226 return err;
1227
1228 out_destroy_ctl_sock:
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 unregister_pernet_subsys(&dccp_v6_ops);
1239 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240 inet6_unregister_protosw(&dccp_v6_protosw);
1241 proto_unregister(&dccp_v6_prot);
1242 }
1243
1244 module_init(dccp_v6_init);
1245 module_exit(dccp_v6_exit);
1246
1247 /*
1248 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1249 * values directly, Also cover the case where the protocol is not specified,
1250 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1251 */
1252 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1254 MODULE_LICENSE("GPL");
1255 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1256 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Linux MOXA ART SoC ARM port