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dccp: List management for new feature negotiation
[deliverable/linux.git] / net / dccp / ipv6.c
1 /*
2 * DCCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/xfrm.h>
18
19 #include <net/addrconf.h>
20 #include <net/inet_common.h>
21 #include <net/inet_hashtables.h>
22 #include <net/inet_sock.h>
23 #include <net/inet6_connection_sock.h>
24 #include <net/inet6_hashtables.h>
25 #include <net/ip6_route.h>
26 #include <net/ipv6.h>
27 #include <net/protocol.h>
28 #include <net/transp_v6.h>
29 #include <net/ip6_checksum.h>
30 #include <net/xfrm.h>
31
32 #include "dccp.h"
33 #include "ipv6.h"
34 #include "feat.h"
35
36 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
37
38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
40
41 static void dccp_v6_hash(struct sock *sk)
42 {
43 if (sk->sk_state != DCCP_CLOSED) {
44 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
45 inet_hash(sk);
46 return;
47 }
48 local_bh_disable();
49 __inet6_hash(sk);
50 local_bh_enable();
51 }
52 }
53
54 /* add pseudo-header to DCCP checksum stored in skb->csum */
55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
56 struct in6_addr *saddr,
57 struct in6_addr *daddr)
58 {
59 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
60 }
61
62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
63 struct sk_buff *skb)
64 {
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct dccp_hdr *dh = dccp_hdr(skb);
67
68 dccp_csum_outgoing(skb);
69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
70 }
71
72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
73 __be16 sport, __be16 dport )
74 {
75 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
76 }
77
78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
79 {
80 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
81 ipv6_hdr(skb)->saddr.s6_addr32,
82 dccp_hdr(skb)->dccph_dport,
83 dccp_hdr(skb)->dccph_sport );
84
85 }
86
87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __be32 info)
89 {
90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
92 struct dccp_sock *dp;
93 struct ipv6_pinfo *np;
94 struct sock *sk;
95 int err;
96 __u64 seq;
97 struct net *net = dev_net(skb->dev);
98
99 if (skb->len < offset + sizeof(*dh) ||
100 skb->len < offset + __dccp_basic_hdr_len(dh)) {
101 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
102 ICMP6_MIB_INERRORS);
103 return;
104 }
105
106 sk = inet6_lookup(net, &dccp_hashinfo,
107 &hdr->daddr, dh->dccph_dport,
108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
109
110 if (sk == NULL) {
111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 ICMP6_MIB_INERRORS);
113 return;
114 }
115
116 if (sk->sk_state == DCCP_TIME_WAIT) {
117 inet_twsk_put(inet_twsk(sk));
118 return;
119 }
120
121 bh_lock_sock(sk);
122 if (sock_owned_by_user(sk))
123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
124
125 if (sk->sk_state == DCCP_CLOSED)
126 goto out;
127
128 dp = dccp_sk(sk);
129 seq = dccp_hdr_seq(dh);
130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 goto out;
134 }
135
136 np = inet6_sk(sk);
137
138 if (type == ICMPV6_PKT_TOOBIG) {
139 struct dst_entry *dst = NULL;
140
141 if (sock_owned_by_user(sk))
142 goto out;
143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
144 goto out;
145
146 /* icmp should have updated the destination cache entry */
147 dst = __sk_dst_check(sk, np->dst_cookie);
148 if (dst == NULL) {
149 struct inet_sock *inet = inet_sk(sk);
150 struct flowi fl;
151
152 /* BUGGG_FUTURE: Again, it is not clear how
153 to handle rthdr case. Ignore this complexity
154 for now.
155 */
156 memset(&fl, 0, sizeof(fl));
157 fl.proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
159 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
160 fl.oif = sk->sk_bound_dev_if;
161 fl.fl_ip_dport = inet->dport;
162 fl.fl_ip_sport = inet->sport;
163 security_sk_classify_flow(sk, &fl);
164
165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err) {
167 sk->sk_err_soft = -err;
168 goto out;
169 }
170
171 err = xfrm_lookup(&dst, &fl, sk, 0);
172 if (err < 0) {
173 sk->sk_err_soft = -err;
174 goto out;
175 }
176 } else
177 dst_hold(dst);
178
179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
180 dccp_sync_mss(sk, dst_mtu(dst));
181 } /* else let the usual retransmit timer handle it */
182 dst_release(dst);
183 goto out;
184 }
185
186 icmpv6_err_convert(type, code, &err);
187
188 /* Might be for an request_sock */
189 switch (sk->sk_state) {
190 struct request_sock *req, **prev;
191 case DCCP_LISTEN:
192 if (sock_owned_by_user(sk))
193 goto out;
194
195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
196 &hdr->daddr, &hdr->saddr,
197 inet6_iif(skb));
198 if (req == NULL)
199 goto out;
200
201 /*
202 * ICMPs are not backlogged, hence we cannot get an established
203 * socket here.
204 */
205 WARN_ON(req->sk != NULL);
206
207 if (seq != dccp_rsk(req)->dreq_iss) {
208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
209 goto out;
210 }
211
212 inet_csk_reqsk_queue_drop(sk, req, prev);
213 goto out;
214
215 case DCCP_REQUESTING:
216 case DCCP_RESPOND: /* Cannot happen.
217 It can, it SYNs are crossed. --ANK */
218 if (!sock_owned_by_user(sk)) {
219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220 sk->sk_err = err;
221 /*
222 * Wake people up to see the error
223 * (see connect in sock.c)
224 */
225 sk->sk_error_report(sk);
226 dccp_done(sk);
227 } else
228 sk->sk_err_soft = err;
229 goto out;
230 }
231
232 if (!sock_owned_by_user(sk) && np->recverr) {
233 sk->sk_err = err;
234 sk->sk_error_report(sk);
235 } else
236 sk->sk_err_soft = err;
237
238 out:
239 bh_unlock_sock(sk);
240 sock_put(sk);
241 }
242
243
244 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
245 {
246 struct inet6_request_sock *ireq6 = inet6_rsk(req);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sk_buff *skb;
249 struct ipv6_txoptions *opt = NULL;
250 struct in6_addr *final_p = NULL, final;
251 struct flowi fl;
252 int err = -1;
253 struct dst_entry *dst;
254
255 memset(&fl, 0, sizeof(fl));
256 fl.proto = IPPROTO_DCCP;
257 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
258 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
259 fl.fl6_flowlabel = 0;
260 fl.oif = ireq6->iif;
261 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
262 fl.fl_ip_sport = inet_rsk(req)->loc_port;
263 security_req_classify_flow(req, &fl);
264
265 opt = np->opt;
266
267 if (opt != NULL && opt->srcrt != NULL) {
268 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
269
270 ipv6_addr_copy(&final, &fl.fl6_dst);
271 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
272 final_p = &final;
273 }
274
275 err = ip6_dst_lookup(sk, &dst, &fl);
276 if (err)
277 goto done;
278
279 if (final_p)
280 ipv6_addr_copy(&fl.fl6_dst, final_p);
281
282 err = xfrm_lookup(&dst, &fl, sk, 0);
283 if (err < 0)
284 goto done;
285
286 skb = dccp_make_response(sk, dst, req);
287 if (skb != NULL) {
288 struct dccp_hdr *dh = dccp_hdr(skb);
289
290 dh->dccph_checksum = dccp_v6_csum_finish(skb,
291 &ireq6->loc_addr,
292 &ireq6->rmt_addr);
293 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
294 err = ip6_xmit(sk, skb, &fl, opt, 0);
295 err = net_xmit_eval(err);
296 }
297
298 done:
299 if (opt != NULL && opt != np->opt)
300 sock_kfree_s(sk, opt, opt->tot_len);
301 dst_release(dst);
302 return err;
303 }
304
305 static void dccp_v6_reqsk_destructor(struct request_sock *req)
306 {
307 if (inet6_rsk(req)->pktopts != NULL)
308 kfree_skb(inet6_rsk(req)->pktopts);
309 }
310
311 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
312 {
313 struct ipv6hdr *rxip6h;
314 struct sk_buff *skb;
315 struct flowi fl;
316 struct net *net = dev_net(rxskb->dst->dev);
317 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
318
319 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
320 return;
321
322 if (!ipv6_unicast_destination(rxskb))
323 return;
324
325 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
326 if (skb == NULL)
327 return;
328
329 rxip6h = ipv6_hdr(rxskb);
330 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
331 &rxip6h->daddr);
332
333 memset(&fl, 0, sizeof(fl));
334 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
335 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
336
337 fl.proto = IPPROTO_DCCP;
338 fl.oif = inet6_iif(rxskb);
339 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
340 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
341 security_skb_classify_flow(rxskb, &fl);
342
343 /* sk = NULL, but it is safe for now. RST socket required. */
344 if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
345 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
346 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
347 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
348 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
349 return;
350 }
351 }
352
353 kfree_skb(skb);
354 }
355
356 static struct request_sock_ops dccp6_request_sock_ops = {
357 .family = AF_INET6,
358 .obj_size = sizeof(struct dccp6_request_sock),
359 .rtx_syn_ack = dccp_v6_send_response,
360 .send_ack = dccp_reqsk_send_ack,
361 .destructor = dccp_v6_reqsk_destructor,
362 .send_reset = dccp_v6_ctl_send_reset,
363 };
364
365 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
366 {
367 const struct dccp_hdr *dh = dccp_hdr(skb);
368 const struct ipv6hdr *iph = ipv6_hdr(skb);
369 struct sock *nsk;
370 struct request_sock **prev;
371 /* Find possible connection requests. */
372 struct request_sock *req = inet6_csk_search_req(sk, &prev,
373 dh->dccph_sport,
374 &iph->saddr,
375 &iph->daddr,
376 inet6_iif(skb));
377 if (req != NULL)
378 return dccp_check_req(sk, skb, req, prev);
379
380 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
381 &iph->saddr, dh->dccph_sport,
382 &iph->daddr, ntohs(dh->dccph_dport),
383 inet6_iif(skb));
384 if (nsk != NULL) {
385 if (nsk->sk_state != DCCP_TIME_WAIT) {
386 bh_lock_sock(nsk);
387 return nsk;
388 }
389 inet_twsk_put(inet_twsk(nsk));
390 return NULL;
391 }
392
393 return sk;
394 }
395
396 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
397 {
398 struct request_sock *req;
399 struct dccp_request_sock *dreq;
400 struct inet6_request_sock *ireq6;
401 struct ipv6_pinfo *np = inet6_sk(sk);
402 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
403 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
404
405 if (skb->protocol == htons(ETH_P_IP))
406 return dccp_v4_conn_request(sk, skb);
407
408 if (!ipv6_unicast_destination(skb))
409 return 0; /* discard, don't send a reset here */
410
411 if (dccp_bad_service_code(sk, service)) {
412 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
413 goto drop;
414 }
415 /*
416 * There are no SYN attacks on IPv6, yet...
417 */
418 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
419 if (inet_csk_reqsk_queue_is_full(sk))
420 goto drop;
421
422 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
423 goto drop;
424
425 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
426 if (req == NULL)
427 goto drop;
428
429 dccp_reqsk_init(req, skb);
430
431 dreq = dccp_rsk(req);
432 if (dccp_parse_options(sk, dreq, skb))
433 goto drop_and_free;
434
435 if (security_inet_conn_request(sk, skb, req))
436 goto drop_and_free;
437
438 ireq6 = inet6_rsk(req);
439 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
440 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
441
442 if (ipv6_opt_accepted(sk, skb) ||
443 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
444 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
445 atomic_inc(&skb->users);
446 ireq6->pktopts = skb;
447 }
448 ireq6->iif = sk->sk_bound_dev_if;
449
450 /* So that link locals have meaning */
451 if (!sk->sk_bound_dev_if &&
452 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
453 ireq6->iif = inet6_iif(skb);
454
455 /*
456 * Step 3: Process LISTEN state
457 *
458 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
459 *
460 * In fact we defer setting S.GSR, S.SWL, S.SWH to
461 * dccp_create_openreq_child.
462 */
463 dreq->dreq_isr = dcb->dccpd_seq;
464 dreq->dreq_iss = dccp_v6_init_sequence(skb);
465 dreq->dreq_service = service;
466
467 if (dccp_v6_send_response(sk, req))
468 goto drop_and_free;
469
470 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
471 return 0;
472
473 drop_and_free:
474 reqsk_free(req);
475 drop:
476 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
477 return -1;
478 }
479
480 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
481 struct sk_buff *skb,
482 struct request_sock *req,
483 struct dst_entry *dst)
484 {
485 struct inet6_request_sock *ireq6 = inet6_rsk(req);
486 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
487 struct inet_sock *newinet;
488 struct dccp_sock *newdp;
489 struct dccp6_sock *newdp6;
490 struct sock *newsk;
491 struct ipv6_txoptions *opt;
492
493 if (skb->protocol == htons(ETH_P_IP)) {
494 /*
495 * v6 mapped
496 */
497 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
498 if (newsk == NULL)
499 return NULL;
500
501 newdp6 = (struct dccp6_sock *)newsk;
502 newdp = dccp_sk(newsk);
503 newinet = inet_sk(newsk);
504 newinet->pinet6 = &newdp6->inet6;
505 newnp = inet6_sk(newsk);
506
507 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
508
509 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
510 newinet->daddr);
511
512 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
513 newinet->saddr);
514
515 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
516
517 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
518 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
519 newnp->pktoptions = NULL;
520 newnp->opt = NULL;
521 newnp->mcast_oif = inet6_iif(skb);
522 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
523
524 /*
525 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
526 * here, dccp_create_openreq_child now does this for us, see the comment in
527 * that function for the gory details. -acme
528 */
529
530 /* It is tricky place. Until this moment IPv4 tcp
531 worked with IPv6 icsk.icsk_af_ops.
532 Sync it now.
533 */
534 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
535
536 return newsk;
537 }
538
539 opt = np->opt;
540
541 if (sk_acceptq_is_full(sk))
542 goto out_overflow;
543
544 if (dst == NULL) {
545 struct in6_addr *final_p = NULL, final;
546 struct flowi fl;
547
548 memset(&fl, 0, sizeof(fl));
549 fl.proto = IPPROTO_DCCP;
550 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
551 if (opt != NULL && opt->srcrt != NULL) {
552 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
553
554 ipv6_addr_copy(&final, &fl.fl6_dst);
555 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
556 final_p = &final;
557 }
558 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
559 fl.oif = sk->sk_bound_dev_if;
560 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
561 fl.fl_ip_sport = inet_rsk(req)->loc_port;
562 security_sk_classify_flow(sk, &fl);
563
564 if (ip6_dst_lookup(sk, &dst, &fl))
565 goto out;
566
567 if (final_p)
568 ipv6_addr_copy(&fl.fl6_dst, final_p);
569
570 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
571 goto out;
572 }
573
574 newsk = dccp_create_openreq_child(sk, req, skb);
575 if (newsk == NULL)
576 goto out;
577
578 /*
579 * No need to charge this sock to the relevant IPv6 refcnt debug socks
580 * count here, dccp_create_openreq_child now does this for us, see the
581 * comment in that function for the gory details. -acme
582 */
583
584 __ip6_dst_store(newsk, dst, NULL, NULL);
585 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
586 NETIF_F_TSO);
587 newdp6 = (struct dccp6_sock *)newsk;
588 newinet = inet_sk(newsk);
589 newinet->pinet6 = &newdp6->inet6;
590 newdp = dccp_sk(newsk);
591 newnp = inet6_sk(newsk);
592
593 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
594
595 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
596 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
597 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
598 newsk->sk_bound_dev_if = ireq6->iif;
599
600 /* Now IPv6 options...
601
602 First: no IPv4 options.
603 */
604 newinet->opt = NULL;
605
606 /* Clone RX bits */
607 newnp->rxopt.all = np->rxopt.all;
608
609 /* Clone pktoptions received with SYN */
610 newnp->pktoptions = NULL;
611 if (ireq6->pktopts != NULL) {
612 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
613 kfree_skb(ireq6->pktopts);
614 ireq6->pktopts = NULL;
615 if (newnp->pktoptions)
616 skb_set_owner_r(newnp->pktoptions, newsk);
617 }
618 newnp->opt = NULL;
619 newnp->mcast_oif = inet6_iif(skb);
620 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
621
622 /*
623 * Clone native IPv6 options from listening socket (if any)
624 *
625 * Yes, keeping reference count would be much more clever, but we make
626 * one more one thing there: reattach optmem to newsk.
627 */
628 if (opt != NULL) {
629 newnp->opt = ipv6_dup_options(newsk, opt);
630 if (opt != np->opt)
631 sock_kfree_s(sk, opt, opt->tot_len);
632 }
633
634 inet_csk(newsk)->icsk_ext_hdr_len = 0;
635 if (newnp->opt != NULL)
636 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
637 newnp->opt->opt_flen);
638
639 dccp_sync_mss(newsk, dst_mtu(dst));
640
641 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
642
643 __inet6_hash(newsk);
644 __inet_inherit_port(sk, newsk);
645
646 return newsk;
647
648 out_overflow:
649 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
650 out:
651 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
652 if (opt != NULL && opt != np->opt)
653 sock_kfree_s(sk, opt, opt->tot_len);
654 dst_release(dst);
655 return NULL;
656 }
657
658 /* The socket must have it's spinlock held when we get
659 * here.
660 *
661 * We have a potential double-lock case here, so even when
662 * doing backlog processing we use the BH locking scheme.
663 * This is because we cannot sleep with the original spinlock
664 * held.
665 */
666 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
667 {
668 struct ipv6_pinfo *np = inet6_sk(sk);
669 struct sk_buff *opt_skb = NULL;
670
671 /* Imagine: socket is IPv6. IPv4 packet arrives,
672 goes to IPv4 receive handler and backlogged.
673 From backlog it always goes here. Kerboom...
674 Fortunately, dccp_rcv_established and rcv_established
675 handle them correctly, but it is not case with
676 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
677 */
678
679 if (skb->protocol == htons(ETH_P_IP))
680 return dccp_v4_do_rcv(sk, skb);
681
682 if (sk_filter(sk, skb))
683 goto discard;
684
685 /*
686 * socket locking is here for SMP purposes as backlog rcv is currently
687 * called with bh processing disabled.
688 */
689
690 /* Do Stevens' IPV6_PKTOPTIONS.
691
692 Yes, guys, it is the only place in our code, where we
693 may make it not affecting IPv4.
694 The rest of code is protocol independent,
695 and I do not like idea to uglify IPv4.
696
697 Actually, all the idea behind IPV6_PKTOPTIONS
698 looks not very well thought. For now we latch
699 options, received in the last packet, enqueued
700 by tcp. Feel free to propose better solution.
701 --ANK (980728)
702 */
703 if (np->rxopt.all)
704 /*
705 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
706 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
707 */
708 opt_skb = skb_clone(skb, GFP_ATOMIC);
709
710 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
711 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
712 goto reset;
713 if (opt_skb) {
714 /* XXX This is where we would goto ipv6_pktoptions. */
715 __kfree_skb(opt_skb);
716 }
717 return 0;
718 }
719
720 /*
721 * Step 3: Process LISTEN state
722 * If S.state == LISTEN,
723 * If P.type == Request or P contains a valid Init Cookie option,
724 * (* Must scan the packet's options to check for Init
725 * Cookies. Only Init Cookies are processed here,
726 * however; other options are processed in Step 8. This
727 * scan need only be performed if the endpoint uses Init
728 * Cookies *)
729 * (* Generate a new socket and switch to that socket *)
730 * Set S := new socket for this port pair
731 * S.state = RESPOND
732 * Choose S.ISS (initial seqno) or set from Init Cookies
733 * Initialize S.GAR := S.ISS
734 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
735 * Continue with S.state == RESPOND
736 * (* A Response packet will be generated in Step 11 *)
737 * Otherwise,
738 * Generate Reset(No Connection) unless P.type == Reset
739 * Drop packet and return
740 *
741 * NOTE: the check for the packet types is done in
742 * dccp_rcv_state_process
743 */
744 if (sk->sk_state == DCCP_LISTEN) {
745 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
746
747 if (nsk == NULL)
748 goto discard;
749 /*
750 * Queue it on the new socket if the new socket is active,
751 * otherwise we just shortcircuit this and continue with
752 * the new socket..
753 */
754 if (nsk != sk) {
755 if (dccp_child_process(sk, nsk, skb))
756 goto reset;
757 if (opt_skb != NULL)
758 __kfree_skb(opt_skb);
759 return 0;
760 }
761 }
762
763 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
764 goto reset;
765 if (opt_skb) {
766 /* XXX This is where we would goto ipv6_pktoptions. */
767 __kfree_skb(opt_skb);
768 }
769 return 0;
770
771 reset:
772 dccp_v6_ctl_send_reset(sk, skb);
773 discard:
774 if (opt_skb != NULL)
775 __kfree_skb(opt_skb);
776 kfree_skb(skb);
777 return 0;
778 }
779
780 static int dccp_v6_rcv(struct sk_buff *skb)
781 {
782 const struct dccp_hdr *dh;
783 struct sock *sk;
784 int min_cov;
785
786 /* Step 1: Check header basics */
787
788 if (dccp_invalid_packet(skb))
789 goto discard_it;
790
791 /* Step 1: If header checksum is incorrect, drop packet and return. */
792 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
793 &ipv6_hdr(skb)->daddr)) {
794 DCCP_WARN("dropped packet with invalid checksum\n");
795 goto discard_it;
796 }
797
798 dh = dccp_hdr(skb);
799
800 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
801 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
802
803 if (dccp_packet_without_ack(skb))
804 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
805 else
806 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
807
808 /* Step 2:
809 * Look up flow ID in table and get corresponding socket */
810 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
811 dh->dccph_sport, dh->dccph_dport);
812 /*
813 * Step 2:
814 * If no socket ...
815 */
816 if (sk == NULL) {
817 dccp_pr_debug("failed to look up flow ID in table and "
818 "get corresponding socket\n");
819 goto no_dccp_socket;
820 }
821
822 /*
823 * Step 2:
824 * ... or S.state == TIMEWAIT,
825 * Generate Reset(No Connection) unless P.type == Reset
826 * Drop packet and return
827 */
828 if (sk->sk_state == DCCP_TIME_WAIT) {
829 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
830 inet_twsk_put(inet_twsk(sk));
831 goto no_dccp_socket;
832 }
833
834 /*
835 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
836 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
837 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
838 */
839 min_cov = dccp_sk(sk)->dccps_pcrlen;
840 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
841 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
842 dh->dccph_cscov, min_cov);
843 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
844 goto discard_and_relse;
845 }
846
847 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
848 goto discard_and_relse;
849
850 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
851
852 no_dccp_socket:
853 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
854 goto discard_it;
855 /*
856 * Step 2:
857 * If no socket ...
858 * Generate Reset(No Connection) unless P.type == Reset
859 * Drop packet and return
860 */
861 if (dh->dccph_type != DCCP_PKT_RESET) {
862 DCCP_SKB_CB(skb)->dccpd_reset_code =
863 DCCP_RESET_CODE_NO_CONNECTION;
864 dccp_v6_ctl_send_reset(sk, skb);
865 }
866
867 discard_it:
868 kfree_skb(skb);
869 return 0;
870
871 discard_and_relse:
872 sock_put(sk);
873 goto discard_it;
874 }
875
876 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
877 int addr_len)
878 {
879 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
880 struct inet_connection_sock *icsk = inet_csk(sk);
881 struct inet_sock *inet = inet_sk(sk);
882 struct ipv6_pinfo *np = inet6_sk(sk);
883 struct dccp_sock *dp = dccp_sk(sk);
884 struct in6_addr *saddr = NULL, *final_p = NULL, final;
885 struct flowi fl;
886 struct dst_entry *dst;
887 int addr_type;
888 int err;
889
890 dp->dccps_role = DCCP_ROLE_CLIENT;
891
892 if (addr_len < SIN6_LEN_RFC2133)
893 return -EINVAL;
894
895 if (usin->sin6_family != AF_INET6)
896 return -EAFNOSUPPORT;
897
898 memset(&fl, 0, sizeof(fl));
899
900 if (np->sndflow) {
901 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
902 IP6_ECN_flow_init(fl.fl6_flowlabel);
903 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
904 struct ip6_flowlabel *flowlabel;
905 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
906 if (flowlabel == NULL)
907 return -EINVAL;
908 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
909 fl6_sock_release(flowlabel);
910 }
911 }
912 /*
913 * connect() to INADDR_ANY means loopback (BSD'ism).
914 */
915 if (ipv6_addr_any(&usin->sin6_addr))
916 usin->sin6_addr.s6_addr[15] = 1;
917
918 addr_type = ipv6_addr_type(&usin->sin6_addr);
919
920 if (addr_type & IPV6_ADDR_MULTICAST)
921 return -ENETUNREACH;
922
923 if (addr_type & IPV6_ADDR_LINKLOCAL) {
924 if (addr_len >= sizeof(struct sockaddr_in6) &&
925 usin->sin6_scope_id) {
926 /* If interface is set while binding, indices
927 * must coincide.
928 */
929 if (sk->sk_bound_dev_if &&
930 sk->sk_bound_dev_if != usin->sin6_scope_id)
931 return -EINVAL;
932
933 sk->sk_bound_dev_if = usin->sin6_scope_id;
934 }
935
936 /* Connect to link-local address requires an interface */
937 if (!sk->sk_bound_dev_if)
938 return -EINVAL;
939 }
940
941 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
942 np->flow_label = fl.fl6_flowlabel;
943
944 /*
945 * DCCP over IPv4
946 */
947 if (addr_type == IPV6_ADDR_MAPPED) {
948 u32 exthdrlen = icsk->icsk_ext_hdr_len;
949 struct sockaddr_in sin;
950
951 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
952
953 if (__ipv6_only_sock(sk))
954 return -ENETUNREACH;
955
956 sin.sin_family = AF_INET;
957 sin.sin_port = usin->sin6_port;
958 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
959
960 icsk->icsk_af_ops = &dccp_ipv6_mapped;
961 sk->sk_backlog_rcv = dccp_v4_do_rcv;
962
963 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
964 if (err) {
965 icsk->icsk_ext_hdr_len = exthdrlen;
966 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
967 sk->sk_backlog_rcv = dccp_v6_do_rcv;
968 goto failure;
969 } else {
970 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
971 inet->saddr);
972 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
973 inet->rcv_saddr);
974 }
975
976 return err;
977 }
978
979 if (!ipv6_addr_any(&np->rcv_saddr))
980 saddr = &np->rcv_saddr;
981
982 fl.proto = IPPROTO_DCCP;
983 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
984 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
985 fl.oif = sk->sk_bound_dev_if;
986 fl.fl_ip_dport = usin->sin6_port;
987 fl.fl_ip_sport = inet->sport;
988 security_sk_classify_flow(sk, &fl);
989
990 if (np->opt != NULL && np->opt->srcrt != NULL) {
991 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
992
993 ipv6_addr_copy(&final, &fl.fl6_dst);
994 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
995 final_p = &final;
996 }
997
998 err = ip6_dst_lookup(sk, &dst, &fl);
999 if (err)
1000 goto failure;
1001
1002 if (final_p)
1003 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
1005 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1006 if (err < 0) {
1007 if (err == -EREMOTE)
1008 err = ip6_dst_blackhole(sk, &dst, &fl);
1009 if (err < 0)
1010 goto failure;
1011 }
1012
1013 if (saddr == NULL) {
1014 saddr = &fl.fl6_src;
1015 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016 }
1017
1018 /* set the source address */
1019 ipv6_addr_copy(&np->saddr, saddr);
1020 inet->rcv_saddr = LOOPBACK4_IPV6;
1021
1022 __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024 icsk->icsk_ext_hdr_len = 0;
1025 if (np->opt != NULL)
1026 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027 np->opt->opt_nflen);
1028
1029 inet->dport = usin->sin6_port;
1030
1031 dccp_set_state(sk, DCCP_REQUESTING);
1032 err = inet6_hash_connect(&dccp_death_row, sk);
1033 if (err)
1034 goto late_failure;
1035
1036 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037 np->daddr.s6_addr32,
1038 inet->sport, inet->dport);
1039 err = dccp_connect(sk);
1040 if (err)
1041 goto late_failure;
1042
1043 return 0;
1044
1045 late_failure:
1046 dccp_set_state(sk, DCCP_CLOSED);
1047 __sk_dst_reset(sk);
1048 failure:
1049 inet->dport = 0;
1050 sk->sk_route_caps = 0;
1051 return err;
1052 }
1053
1054 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1055 .queue_xmit = inet6_csk_xmit,
1056 .send_check = dccp_v6_send_check,
1057 .rebuild_header = inet6_sk_rebuild_header,
1058 .conn_request = dccp_v6_conn_request,
1059 .syn_recv_sock = dccp_v6_request_recv_sock,
1060 .net_header_len = sizeof(struct ipv6hdr),
1061 .setsockopt = ipv6_setsockopt,
1062 .getsockopt = ipv6_getsockopt,
1063 .addr2sockaddr = inet6_csk_addr2sockaddr,
1064 .sockaddr_len = sizeof(struct sockaddr_in6),
1065 .bind_conflict = inet6_csk_bind_conflict,
1066 #ifdef CONFIG_COMPAT
1067 .compat_setsockopt = compat_ipv6_setsockopt,
1068 .compat_getsockopt = compat_ipv6_getsockopt,
1069 #endif
1070 };
1071
1072 /*
1073 * DCCP over IPv4 via INET6 API
1074 */
1075 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1076 .queue_xmit = ip_queue_xmit,
1077 .send_check = dccp_v4_send_check,
1078 .rebuild_header = inet_sk_rebuild_header,
1079 .conn_request = dccp_v6_conn_request,
1080 .syn_recv_sock = dccp_v6_request_recv_sock,
1081 .net_header_len = sizeof(struct iphdr),
1082 .setsockopt = ipv6_setsockopt,
1083 .getsockopt = ipv6_getsockopt,
1084 .addr2sockaddr = inet6_csk_addr2sockaddr,
1085 .sockaddr_len = sizeof(struct sockaddr_in6),
1086 #ifdef CONFIG_COMPAT
1087 .compat_setsockopt = compat_ipv6_setsockopt,
1088 .compat_getsockopt = compat_ipv6_getsockopt,
1089 #endif
1090 };
1091
1092 /* NOTE: A lot of things set to zero explicitly by call to
1093 * sk_alloc() so need not be done here.
1094 */
1095 static int dccp_v6_init_sock(struct sock *sk)
1096 {
1097 static __u8 dccp_v6_ctl_sock_initialized;
1098 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1099
1100 if (err == 0) {
1101 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102 dccp_v6_ctl_sock_initialized = 1;
1103 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1104 }
1105
1106 return err;
1107 }
1108
1109 static void dccp_v6_destroy_sock(struct sock *sk)
1110 {
1111 dccp_destroy_sock(sk);
1112 inet6_destroy_sock(sk);
1113 }
1114
1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1117 };
1118
1119 static struct proto dccp_v6_prot = {
1120 .name = "DCCPv6",
1121 .owner = THIS_MODULE,
1122 .close = dccp_close,
1123 .connect = dccp_v6_connect,
1124 .disconnect = dccp_disconnect,
1125 .ioctl = dccp_ioctl,
1126 .init = dccp_v6_init_sock,
1127 .setsockopt = dccp_setsockopt,
1128 .getsockopt = dccp_getsockopt,
1129 .sendmsg = dccp_sendmsg,
1130 .recvmsg = dccp_recvmsg,
1131 .backlog_rcv = dccp_v6_do_rcv,
1132 .hash = dccp_v6_hash,
1133 .unhash = inet_unhash,
1134 .accept = inet_csk_accept,
1135 .get_port = inet_csk_get_port,
1136 .shutdown = dccp_shutdown,
1137 .destroy = dccp_v6_destroy_sock,
1138 .orphan_count = &dccp_orphan_count,
1139 .max_header = MAX_DCCP_HEADER,
1140 .obj_size = sizeof(struct dccp6_sock),
1141 .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 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 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 kernel - Deliverables
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