3 * Linux INET6 implementation
5 * Based on net/dccp6/ipv6.c
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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.
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/xfrm.h>
19 #include <linux/string.h>
21 #include <net/addrconf.h>
22 #include <net/inet_common.h>
23 #include <net/inet_hashtables.h>
24 #include <net/inet_sock.h>
25 #include <net/inet6_connection_sock.h>
26 #include <net/inet6_hashtables.h>
27 #include <net/ip6_route.h>
29 #include <net/protocol.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_checksum.h>
33 #include <net/secure_seq.h>
40 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
42 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
43 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
45 /* add pseudo-header to DCCP checksum stored in skb->csum */
46 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
47 const struct in6_addr *saddr,
48 const struct in6_addr *daddr)
50 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
53 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
55 struct ipv6_pinfo *np = inet6_sk(sk);
56 struct dccp_hdr *dh = dccp_hdr(skb);
58 dccp_csum_outgoing(skb);
59 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
62 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
64 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
65 ipv6_hdr(skb)->saddr.s6_addr32,
66 dccp_hdr(skb)->dccph_dport,
67 dccp_hdr(skb)->dccph_sport );
71 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
72 u8 type, u8 code, int offset, __be32 info)
74 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
75 const struct dccp_hdr *dh;
77 struct ipv6_pinfo *np;
81 struct net *net = dev_net(skb->dev);
83 /* Only need dccph_dport & dccph_sport which are the first
84 * 4 bytes in dccp header.
85 * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
87 BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8);
88 BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8);
89 dh = (struct dccp_hdr *)(skb->data + offset);
91 sk = __inet6_lookup_established(net, &dccp_hashinfo,
92 &hdr->daddr, dh->dccph_dport,
93 &hdr->saddr, ntohs(dh->dccph_sport),
97 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
102 if (sk->sk_state == DCCP_TIME_WAIT) {
103 inet_twsk_put(inet_twsk(sk));
106 seq = dccp_hdr_seq(dh);
107 if (sk->sk_state == DCCP_NEW_SYN_RECV)
108 return dccp_req_err(sk, seq);
111 if (sock_owned_by_user(sk))
112 __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
114 if (sk->sk_state == DCCP_CLOSED)
118 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
119 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
120 __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
126 if (type == NDISC_REDIRECT) {
127 if (!sock_owned_by_user(sk)) {
128 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
131 dst->ops->redirect(dst, sk, skb);
136 if (type == ICMPV6_PKT_TOOBIG) {
137 struct dst_entry *dst = NULL;
139 if (!ip6_sk_accept_pmtu(sk))
142 if (sock_owned_by_user(sk))
144 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
147 dst = inet6_csk_update_pmtu(sk, ntohl(info));
151 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
152 dccp_sync_mss(sk, dst_mtu(dst));
156 icmpv6_err_convert(type, code, &err);
158 /* Might be for an request_sock */
159 switch (sk->sk_state) {
160 case DCCP_REQUESTING:
161 case DCCP_RESPOND: /* Cannot happen.
162 It can, it SYNs are crossed. --ANK */
163 if (!sock_owned_by_user(sk)) {
164 __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
167 * Wake people up to see the error
168 * (see connect in sock.c)
170 sk->sk_error_report(sk);
173 sk->sk_err_soft = err;
177 if (!sock_owned_by_user(sk) && np->recverr) {
179 sk->sk_error_report(sk);
181 sk->sk_err_soft = err;
189 static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req)
191 struct inet_request_sock *ireq = inet_rsk(req);
192 struct ipv6_pinfo *np = inet6_sk(sk);
194 struct in6_addr *final_p, final;
197 struct dst_entry *dst;
199 memset(&fl6, 0, sizeof(fl6));
200 fl6.flowi6_proto = IPPROTO_DCCP;
201 fl6.daddr = ireq->ir_v6_rmt_addr;
202 fl6.saddr = ireq->ir_v6_loc_addr;
204 fl6.flowi6_oif = ireq->ir_iif;
205 fl6.fl6_dport = ireq->ir_rmt_port;
206 fl6.fl6_sport = htons(ireq->ir_num);
207 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
211 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
214 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
221 skb = dccp_make_response(sk, dst, req);
223 struct dccp_hdr *dh = dccp_hdr(skb);
224 struct ipv6_txoptions *opt;
226 dh->dccph_checksum = dccp_v6_csum_finish(skb,
227 &ireq->ir_v6_loc_addr,
228 &ireq->ir_v6_rmt_addr);
229 fl6.daddr = ireq->ir_v6_rmt_addr;
231 opt = ireq->ipv6_opt;
233 opt = rcu_dereference(np->opt);
234 err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass);
236 err = net_xmit_eval(err);
244 static void dccp_v6_reqsk_destructor(struct request_sock *req)
246 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
247 kfree(inet_rsk(req)->ipv6_opt);
248 kfree_skb(inet_rsk(req)->pktopts);
251 static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb)
253 const struct ipv6hdr *rxip6h;
256 struct net *net = dev_net(skb_dst(rxskb)->dev);
257 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
258 struct dst_entry *dst;
260 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
263 if (!ipv6_unicast_destination(rxskb))
266 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
270 rxip6h = ipv6_hdr(rxskb);
271 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
274 memset(&fl6, 0, sizeof(fl6));
275 fl6.daddr = rxip6h->saddr;
276 fl6.saddr = rxip6h->daddr;
278 fl6.flowi6_proto = IPPROTO_DCCP;
279 fl6.flowi6_oif = inet6_iif(rxskb);
280 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
281 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
282 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
284 /* sk = NULL, but it is safe for now. RST socket required. */
285 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
287 skb_dst_set(skb, dst);
288 ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0);
289 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
290 DCCP_INC_STATS(DCCP_MIB_OUTRSTS);
297 static struct request_sock_ops dccp6_request_sock_ops = {
299 .obj_size = sizeof(struct dccp6_request_sock),
300 .rtx_syn_ack = dccp_v6_send_response,
301 .send_ack = dccp_reqsk_send_ack,
302 .destructor = dccp_v6_reqsk_destructor,
303 .send_reset = dccp_v6_ctl_send_reset,
304 .syn_ack_timeout = dccp_syn_ack_timeout,
307 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
309 struct request_sock *req;
310 struct dccp_request_sock *dreq;
311 struct inet_request_sock *ireq;
312 struct ipv6_pinfo *np = inet6_sk(sk);
313 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
314 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
316 if (skb->protocol == htons(ETH_P_IP))
317 return dccp_v4_conn_request(sk, skb);
319 if (!ipv6_unicast_destination(skb))
320 return 0; /* discard, don't send a reset here */
322 if (dccp_bad_service_code(sk, service)) {
323 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
327 * There are no SYN attacks on IPv6, yet...
329 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
330 if (inet_csk_reqsk_queue_is_full(sk))
333 if (sk_acceptq_is_full(sk))
336 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
340 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
343 dreq = dccp_rsk(req);
344 if (dccp_parse_options(sk, dreq, skb))
347 if (security_inet_conn_request(sk, skb, req))
350 ireq = inet_rsk(req);
351 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
352 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
353 ireq->ireq_family = AF_INET6;
354 ireq->ir_mark = inet_request_mark(sk, skb);
356 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
357 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
358 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
359 refcount_inc(&skb->users);
362 ireq->ir_iif = sk->sk_bound_dev_if;
364 /* So that link locals have meaning */
365 if (!sk->sk_bound_dev_if &&
366 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
367 ireq->ir_iif = inet6_iif(skb);
370 * Step 3: Process LISTEN state
372 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
374 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
376 dreq->dreq_isr = dcb->dccpd_seq;
377 dreq->dreq_gsr = dreq->dreq_isr;
378 dreq->dreq_iss = dccp_v6_init_sequence(skb);
379 dreq->dreq_gss = dreq->dreq_iss;
380 dreq->dreq_service = service;
382 if (dccp_v6_send_response(sk, req))
385 inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
392 __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
396 static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
398 struct request_sock *req,
399 struct dst_entry *dst,
400 struct request_sock *req_unhash,
403 struct inet_request_sock *ireq = inet_rsk(req);
404 struct ipv6_pinfo *newnp;
405 const struct ipv6_pinfo *np = inet6_sk(sk);
406 struct ipv6_txoptions *opt;
407 struct inet_sock *newinet;
408 struct dccp6_sock *newdp6;
411 if (skb->protocol == htons(ETH_P_IP)) {
415 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst,
416 req_unhash, own_req);
420 newdp6 = (struct dccp6_sock *)newsk;
421 newinet = inet_sk(newsk);
422 newinet->pinet6 = &newdp6->inet6;
423 newnp = inet6_sk(newsk);
425 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
427 newnp->saddr = newsk->sk_v6_rcv_saddr;
429 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
430 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
431 newnp->pktoptions = NULL;
433 newnp->ipv6_mc_list = NULL;
434 newnp->ipv6_ac_list = NULL;
435 newnp->ipv6_fl_list = NULL;
436 newnp->mcast_oif = inet6_iif(skb);
437 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
440 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
441 * here, dccp_create_openreq_child now does this for us, see the comment in
442 * that function for the gory details. -acme
445 /* It is tricky place. Until this moment IPv4 tcp
446 worked with IPv6 icsk.icsk_af_ops.
449 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
455 if (sk_acceptq_is_full(sk))
461 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP);
466 newsk = dccp_create_openreq_child(sk, req, skb);
471 * No need to charge this sock to the relevant IPv6 refcnt debug socks
472 * count here, dccp_create_openreq_child now does this for us, see the
473 * comment in that function for the gory details. -acme
476 ip6_dst_store(newsk, dst, NULL, NULL);
477 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
479 newdp6 = (struct dccp6_sock *)newsk;
480 newinet = inet_sk(newsk);
481 newinet->pinet6 = &newdp6->inet6;
482 newnp = inet6_sk(newsk);
484 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
486 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
487 newnp->saddr = ireq->ir_v6_loc_addr;
488 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
489 newsk->sk_bound_dev_if = ireq->ir_iif;
491 /* Now IPv6 options...
493 First: no IPv4 options.
495 newinet->inet_opt = NULL;
498 newnp->rxopt.all = np->rxopt.all;
500 newnp->ipv6_mc_list = NULL;
501 newnp->ipv6_ac_list = NULL;
502 newnp->ipv6_fl_list = NULL;
503 newnp->pktoptions = NULL;
505 newnp->mcast_oif = inet6_iif(skb);
506 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
509 * Clone native IPv6 options from listening socket (if any)
511 * Yes, keeping reference count would be much more clever, but we make
512 * one more one thing there: reattach optmem to newsk.
514 opt = ireq->ipv6_opt;
516 opt = rcu_dereference(np->opt);
518 opt = ipv6_dup_options(newsk, opt);
519 RCU_INIT_POINTER(newnp->opt, opt);
521 inet_csk(newsk)->icsk_ext_hdr_len = 0;
523 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
526 dccp_sync_mss(newsk, dst_mtu(dst));
528 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
529 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
531 if (__inet_inherit_port(sk, newsk) < 0) {
532 inet_csk_prepare_forced_close(newsk);
536 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
537 /* Clone pktoptions received with SYN, if we own the req */
538 if (*own_req && ireq->pktopts) {
539 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
540 consume_skb(ireq->pktopts);
541 ireq->pktopts = NULL;
542 if (newnp->pktoptions)
543 skb_set_owner_r(newnp->pktoptions, newsk);
549 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
553 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS);
557 /* The socket must have it's spinlock held when we get
560 * We have a potential double-lock case here, so even when
561 * doing backlog processing we use the BH locking scheme.
562 * This is because we cannot sleep with the original spinlock
565 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
567 struct ipv6_pinfo *np = inet6_sk(sk);
568 struct sk_buff *opt_skb = NULL;
570 /* Imagine: socket is IPv6. IPv4 packet arrives,
571 goes to IPv4 receive handler and backlogged.
572 From backlog it always goes here. Kerboom...
573 Fortunately, dccp_rcv_established and rcv_established
574 handle them correctly, but it is not case with
575 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
578 if (skb->protocol == htons(ETH_P_IP))
579 return dccp_v4_do_rcv(sk, skb);
581 if (sk_filter(sk, skb))
585 * socket locking is here for SMP purposes as backlog rcv is currently
586 * called with bh processing disabled.
589 /* Do Stevens' IPV6_PKTOPTIONS.
591 Yes, guys, it is the only place in our code, where we
592 may make it not affecting IPv4.
593 The rest of code is protocol independent,
594 and I do not like idea to uglify IPv4.
596 Actually, all the idea behind IPV6_PKTOPTIONS
597 looks not very well thought. For now we latch
598 options, received in the last packet, enqueued
599 by tcp. Feel free to propose better solution.
603 opt_skb = skb_clone(skb, GFP_ATOMIC);
605 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
606 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
609 goto ipv6_pktoptions;
614 * Step 3: Process LISTEN state
615 * If S.state == LISTEN,
616 * If P.type == Request or P contains a valid Init Cookie option,
617 * (* Must scan the packet's options to check for Init
618 * Cookies. Only Init Cookies are processed here,
619 * however; other options are processed in Step 8. This
620 * scan need only be performed if the endpoint uses Init
622 * (* Generate a new socket and switch to that socket *)
623 * Set S := new socket for this port pair
625 * Choose S.ISS (initial seqno) or set from Init Cookies
626 * Initialize S.GAR := S.ISS
627 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
628 * Continue with S.state == RESPOND
629 * (* A Response packet will be generated in Step 11 *)
631 * Generate Reset(No Connection) unless P.type == Reset
632 * Drop packet and return
634 * NOTE: the check for the packet types is done in
635 * dccp_rcv_state_process
638 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
641 goto ipv6_pktoptions;
645 dccp_v6_ctl_send_reset(sk, skb);
648 __kfree_skb(opt_skb);
652 /* Handling IPV6_PKTOPTIONS skb the similar
653 * way it's done for net/ipv6/tcp_ipv6.c
656 if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) {
657 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
658 np->mcast_oif = inet6_iif(opt_skb);
659 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
660 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
661 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
662 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
664 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
665 if (ipv6_opt_accepted(sk, opt_skb,
666 &DCCP_SKB_CB(opt_skb)->header.h6)) {
667 skb_set_owner_r(opt_skb, sk);
668 memmove(IP6CB(opt_skb),
669 &DCCP_SKB_CB(opt_skb)->header.h6,
670 sizeof(struct inet6_skb_parm));
671 opt_skb = xchg(&np->pktoptions, opt_skb);
673 __kfree_skb(opt_skb);
674 opt_skb = xchg(&np->pktoptions, NULL);
682 static int dccp_v6_rcv(struct sk_buff *skb)
684 const struct dccp_hdr *dh;
689 /* Step 1: Check header basics */
691 if (dccp_invalid_packet(skb))
694 /* Step 1: If header checksum is incorrect, drop packet and return. */
695 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
696 &ipv6_hdr(skb)->daddr)) {
697 DCCP_WARN("dropped packet with invalid checksum\n");
703 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
704 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
706 if (dccp_packet_without_ack(skb))
707 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
709 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
712 sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh),
713 dh->dccph_sport, dh->dccph_dport,
714 inet6_iif(skb), 0, &refcounted);
716 dccp_pr_debug("failed to look up flow ID in table and "
717 "get corresponding socket\n");
723 * ... or S.state == TIMEWAIT,
724 * Generate Reset(No Connection) unless P.type == Reset
725 * Drop packet and return
727 if (sk->sk_state == DCCP_TIME_WAIT) {
728 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
729 inet_twsk_put(inet_twsk(sk));
733 if (sk->sk_state == DCCP_NEW_SYN_RECV) {
734 struct request_sock *req = inet_reqsk(sk);
737 sk = req->rsk_listener;
738 if (unlikely(sk->sk_state != DCCP_LISTEN)) {
739 inet_csk_reqsk_queue_drop_and_put(sk, req);
744 nsk = dccp_check_req(sk, skb, req);
747 goto discard_and_relse;
751 } else if (dccp_child_process(sk, nsk, skb)) {
752 dccp_v6_ctl_send_reset(sk, skb);
753 goto discard_and_relse;
760 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
761 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
762 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
764 min_cov = dccp_sk(sk)->dccps_pcrlen;
765 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
766 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
767 dh->dccph_cscov, min_cov);
768 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
769 goto discard_and_relse;
772 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
773 goto discard_and_relse;
775 return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4,
776 refcounted) ? -1 : 0;
779 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
784 * Generate Reset(No Connection) unless P.type == Reset
785 * Drop packet and return
787 if (dh->dccph_type != DCCP_PKT_RESET) {
788 DCCP_SKB_CB(skb)->dccpd_reset_code =
789 DCCP_RESET_CODE_NO_CONNECTION;
790 dccp_v6_ctl_send_reset(sk, skb);
803 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
806 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
807 struct inet_connection_sock *icsk = inet_csk(sk);
808 struct inet_sock *inet = inet_sk(sk);
809 struct ipv6_pinfo *np = inet6_sk(sk);
810 struct dccp_sock *dp = dccp_sk(sk);
811 struct in6_addr *saddr = NULL, *final_p, final;
812 struct ipv6_txoptions *opt;
814 struct dst_entry *dst;
818 dp->dccps_role = DCCP_ROLE_CLIENT;
820 if (addr_len < SIN6_LEN_RFC2133)
823 if (usin->sin6_family != AF_INET6)
824 return -EAFNOSUPPORT;
826 memset(&fl6, 0, sizeof(fl6));
829 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
830 IP6_ECN_flow_init(fl6.flowlabel);
831 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
832 struct ip6_flowlabel *flowlabel;
833 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
834 if (flowlabel == NULL)
836 fl6_sock_release(flowlabel);
840 * connect() to INADDR_ANY means loopback (BSD'ism).
842 if (ipv6_addr_any(&usin->sin6_addr))
843 usin->sin6_addr.s6_addr[15] = 1;
845 addr_type = ipv6_addr_type(&usin->sin6_addr);
847 if (addr_type & IPV6_ADDR_MULTICAST)
850 if (addr_type & IPV6_ADDR_LINKLOCAL) {
851 if (addr_len >= sizeof(struct sockaddr_in6) &&
852 usin->sin6_scope_id) {
853 /* If interface is set while binding, indices
856 if (sk->sk_bound_dev_if &&
857 sk->sk_bound_dev_if != usin->sin6_scope_id)
860 sk->sk_bound_dev_if = usin->sin6_scope_id;
863 /* Connect to link-local address requires an interface */
864 if (!sk->sk_bound_dev_if)
868 sk->sk_v6_daddr = usin->sin6_addr;
869 np->flow_label = fl6.flowlabel;
874 if (addr_type == IPV6_ADDR_MAPPED) {
875 u32 exthdrlen = icsk->icsk_ext_hdr_len;
876 struct sockaddr_in sin;
878 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
880 if (__ipv6_only_sock(sk))
883 sin.sin_family = AF_INET;
884 sin.sin_port = usin->sin6_port;
885 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
887 icsk->icsk_af_ops = &dccp_ipv6_mapped;
888 sk->sk_backlog_rcv = dccp_v4_do_rcv;
890 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
892 icsk->icsk_ext_hdr_len = exthdrlen;
893 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
894 sk->sk_backlog_rcv = dccp_v6_do_rcv;
897 np->saddr = sk->sk_v6_rcv_saddr;
901 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
902 saddr = &sk->sk_v6_rcv_saddr;
904 fl6.flowi6_proto = IPPROTO_DCCP;
905 fl6.daddr = sk->sk_v6_daddr;
906 fl6.saddr = saddr ? *saddr : np->saddr;
907 fl6.flowi6_oif = sk->sk_bound_dev_if;
908 fl6.fl6_dport = usin->sin6_port;
909 fl6.fl6_sport = inet->inet_sport;
910 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
912 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
913 final_p = fl6_update_dst(&fl6, opt, &final);
915 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
923 sk->sk_v6_rcv_saddr = *saddr;
926 /* set the source address */
928 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
930 ip6_dst_store(sk, dst, NULL, NULL);
932 icsk->icsk_ext_hdr_len = 0;
934 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
936 inet->inet_dport = usin->sin6_port;
938 dccp_set_state(sk, DCCP_REQUESTING);
939 err = inet6_hash_connect(&dccp_death_row, sk);
943 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
944 sk->sk_v6_daddr.s6_addr32,
947 err = dccp_connect(sk);
954 dccp_set_state(sk, DCCP_CLOSED);
957 inet->inet_dport = 0;
958 sk->sk_route_caps = 0;
962 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
963 .queue_xmit = inet6_csk_xmit,
964 .send_check = dccp_v6_send_check,
965 .rebuild_header = inet6_sk_rebuild_header,
966 .conn_request = dccp_v6_conn_request,
967 .syn_recv_sock = dccp_v6_request_recv_sock,
968 .net_header_len = sizeof(struct ipv6hdr),
969 .setsockopt = ipv6_setsockopt,
970 .getsockopt = ipv6_getsockopt,
971 .addr2sockaddr = inet6_csk_addr2sockaddr,
972 .sockaddr_len = sizeof(struct sockaddr_in6),
974 .compat_setsockopt = compat_ipv6_setsockopt,
975 .compat_getsockopt = compat_ipv6_getsockopt,
980 * DCCP over IPv4 via INET6 API
982 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
983 .queue_xmit = ip_queue_xmit,
984 .send_check = dccp_v4_send_check,
985 .rebuild_header = inet_sk_rebuild_header,
986 .conn_request = dccp_v6_conn_request,
987 .syn_recv_sock = dccp_v6_request_recv_sock,
988 .net_header_len = sizeof(struct iphdr),
989 .setsockopt = ipv6_setsockopt,
990 .getsockopt = ipv6_getsockopt,
991 .addr2sockaddr = inet6_csk_addr2sockaddr,
992 .sockaddr_len = sizeof(struct sockaddr_in6),
994 .compat_setsockopt = compat_ipv6_setsockopt,
995 .compat_getsockopt = compat_ipv6_getsockopt,
999 /* NOTE: A lot of things set to zero explicitly by call to
1000 * sk_alloc() so need not be done here.
1002 static int dccp_v6_init_sock(struct sock *sk)
1004 static __u8 dccp_v6_ctl_sock_initialized;
1005 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1008 if (unlikely(!dccp_v6_ctl_sock_initialized))
1009 dccp_v6_ctl_sock_initialized = 1;
1010 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1016 static void dccp_v6_destroy_sock(struct sock *sk)
1018 dccp_destroy_sock(sk);
1019 inet6_destroy_sock(sk);
1022 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1023 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1026 static struct proto dccp_v6_prot = {
1028 .owner = THIS_MODULE,
1029 .close = dccp_close,
1030 .connect = dccp_v6_connect,
1031 .disconnect = dccp_disconnect,
1032 .ioctl = dccp_ioctl,
1033 .init = dccp_v6_init_sock,
1034 .setsockopt = dccp_setsockopt,
1035 .getsockopt = dccp_getsockopt,
1036 .sendmsg = dccp_sendmsg,
1037 .recvmsg = dccp_recvmsg,
1038 .backlog_rcv = dccp_v6_do_rcv,
1040 .unhash = inet_unhash,
1041 .accept = inet_csk_accept,
1042 .get_port = inet_csk_get_port,
1043 .shutdown = dccp_shutdown,
1044 .destroy = dccp_v6_destroy_sock,
1045 .orphan_count = &dccp_orphan_count,
1046 .max_header = MAX_DCCP_HEADER,
1047 .obj_size = sizeof(struct dccp6_sock),
1048 .slab_flags = SLAB_TYPESAFE_BY_RCU,
1049 .rsk_prot = &dccp6_request_sock_ops,
1050 .twsk_prot = &dccp6_timewait_sock_ops,
1051 .h.hashinfo = &dccp_hashinfo,
1052 #ifdef CONFIG_COMPAT
1053 .compat_setsockopt = compat_dccp_setsockopt,
1054 .compat_getsockopt = compat_dccp_getsockopt,
1058 static const struct inet6_protocol dccp_v6_protocol = {
1059 .handler = dccp_v6_rcv,
1060 .err_handler = dccp_v6_err,
1061 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1064 static const struct proto_ops inet6_dccp_ops = {
1066 .owner = THIS_MODULE,
1067 .release = inet6_release,
1069 .connect = inet_stream_connect,
1070 .socketpair = sock_no_socketpair,
1071 .accept = inet_accept,
1072 .getname = inet6_getname,
1073 .poll_mask = dccp_poll_mask,
1074 .ioctl = inet6_ioctl,
1075 .listen = inet_dccp_listen,
1076 .shutdown = inet_shutdown,
1077 .setsockopt = sock_common_setsockopt,
1078 .getsockopt = sock_common_getsockopt,
1079 .sendmsg = inet_sendmsg,
1080 .recvmsg = sock_common_recvmsg,
1081 .mmap = sock_no_mmap,
1082 .sendpage = sock_no_sendpage,
1083 #ifdef CONFIG_COMPAT
1084 .compat_setsockopt = compat_sock_common_setsockopt,
1085 .compat_getsockopt = compat_sock_common_getsockopt,
1089 static struct inet_protosw dccp_v6_protosw = {
1091 .protocol = IPPROTO_DCCP,
1092 .prot = &dccp_v6_prot,
1093 .ops = &inet6_dccp_ops,
1094 .flags = INET_PROTOSW_ICSK,
1097 static int __net_init dccp_v6_init_net(struct net *net)
1099 if (dccp_hashinfo.bhash == NULL)
1100 return -ESOCKTNOSUPPORT;
1102 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1103 SOCK_DCCP, IPPROTO_DCCP, net);
1106 static void __net_exit dccp_v6_exit_net(struct net *net)
1108 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1111 static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
1113 inet_twsk_purge(&dccp_hashinfo, AF_INET6);
1116 static struct pernet_operations dccp_v6_ops = {
1117 .init = dccp_v6_init_net,
1118 .exit = dccp_v6_exit_net,
1119 .exit_batch = dccp_v6_exit_batch,
1122 static int __init dccp_v6_init(void)
1124 int err = proto_register(&dccp_v6_prot, 1);
1129 inet6_register_protosw(&dccp_v6_protosw);
1131 err = register_pernet_subsys(&dccp_v6_ops);
1133 goto out_destroy_ctl_sock;
1135 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1137 goto out_unregister_proto;
1141 out_unregister_proto:
1142 unregister_pernet_subsys(&dccp_v6_ops);
1143 out_destroy_ctl_sock:
1144 inet6_unregister_protosw(&dccp_v6_protosw);
1145 proto_unregister(&dccp_v6_prot);
1149 static void __exit dccp_v6_exit(void)
1151 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1152 unregister_pernet_subsys(&dccp_v6_ops);
1153 inet6_unregister_protosw(&dccp_v6_protosw);
1154 proto_unregister(&dccp_v6_prot);
1157 module_init(dccp_v6_init);
1158 module_exit(dccp_v6_exit);
1161 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1162 * values directly, Also cover the case where the protocol is not specified,
1163 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1165 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1166 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1167 MODULE_LICENSE("GPL");
1168 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1169 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");