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/xfrm.h>
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>
27 #include <net/protocol.h>
28 #include <net/transp_v6.h>
29 #include <net/ip6_checksum.h>
36 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
39 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
42 static void dccp_v6_hash(struct sock *sk)
44 if (sk->sk_state != DCCP_CLOSED) {
45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
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)
60 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
63 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
69 dccp_csum_outgoing(skb);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
73 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
74 __be16 sport, __be16 dport )
76 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
79 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
81 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
82 ipv6_hdr(skb)->saddr.s6_addr32,
83 dccp_hdr(skb)->dccph_dport,
84 dccp_hdr(skb)->dccph_sport );
88 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
89 int type, int code, int offset, __be32 info)
91 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
92 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
93 struct ipv6_pinfo *np;
98 sk = inet6_lookup(&init_net, &dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
99 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
102 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
106 if (sk->sk_state == DCCP_TIME_WAIT) {
107 inet_twsk_put(inet_twsk(sk));
112 if (sock_owned_by_user(sk))
113 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
115 if (sk->sk_state == DCCP_CLOSED)
120 if (type == ICMPV6_PKT_TOOBIG) {
121 struct dst_entry *dst = NULL;
123 if (sock_owned_by_user(sk))
125 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
128 /* icmp should have updated the destination cache entry */
129 dst = __sk_dst_check(sk, np->dst_cookie);
131 struct inet_sock *inet = inet_sk(sk);
134 /* BUGGG_FUTURE: Again, it is not clear how
135 to handle rthdr case. Ignore this complexity
138 memset(&fl, 0, sizeof(fl));
139 fl.proto = IPPROTO_DCCP;
140 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
141 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
142 fl.oif = sk->sk_bound_dev_if;
143 fl.fl_ip_dport = inet->dport;
144 fl.fl_ip_sport = inet->sport;
145 security_sk_classify_flow(sk, &fl);
147 err = ip6_dst_lookup(sk, &dst, &fl);
149 sk->sk_err_soft = -err;
153 err = xfrm_lookup(&dst, &fl, sk, 0);
155 sk->sk_err_soft = -err;
161 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
162 dccp_sync_mss(sk, dst_mtu(dst));
163 } /* else let the usual retransmit timer handle it */
168 icmpv6_err_convert(type, code, &err);
170 seq = dccp_hdr_seq(dh);
171 /* Might be for an request_sock */
172 switch (sk->sk_state) {
173 struct request_sock *req, **prev;
175 if (sock_owned_by_user(sk))
178 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
179 &hdr->daddr, &hdr->saddr,
185 * ICMPs are not backlogged, hence we cannot get an established
188 BUG_TRAP(req->sk == NULL);
190 if (seq != dccp_rsk(req)->dreq_iss) {
191 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
195 inet_csk_reqsk_queue_drop(sk, req, prev);
198 case DCCP_REQUESTING:
199 case DCCP_RESPOND: /* Cannot happen.
200 It can, it SYNs are crossed. --ANK */
201 if (!sock_owned_by_user(sk)) {
202 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
205 * Wake people up to see the error
206 * (see connect in sock.c)
208 sk->sk_error_report(sk);
211 sk->sk_err_soft = err;
215 if (!sock_owned_by_user(sk) && np->recverr) {
217 sk->sk_error_report(sk);
219 sk->sk_err_soft = err;
227 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
229 struct inet6_request_sock *ireq6 = inet6_rsk(req);
230 struct ipv6_pinfo *np = inet6_sk(sk);
232 struct ipv6_txoptions *opt = NULL;
233 struct in6_addr *final_p = NULL, final;
236 struct dst_entry *dst;
238 memset(&fl, 0, sizeof(fl));
239 fl.proto = IPPROTO_DCCP;
240 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
241 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
242 fl.fl6_flowlabel = 0;
244 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
245 fl.fl_ip_sport = inet_sk(sk)->sport;
246 security_req_classify_flow(req, &fl);
250 if (opt != NULL && opt->srcrt != NULL) {
251 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
253 ipv6_addr_copy(&final, &fl.fl6_dst);
254 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
258 err = ip6_dst_lookup(sk, &dst, &fl);
263 ipv6_addr_copy(&fl.fl6_dst, final_p);
265 err = xfrm_lookup(&dst, &fl, sk, 0);
269 skb = dccp_make_response(sk, dst, req);
271 struct dccp_hdr *dh = dccp_hdr(skb);
273 dh->dccph_checksum = dccp_v6_csum_finish(skb,
276 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
277 err = ip6_xmit(sk, skb, &fl, opt, 0);
278 err = net_xmit_eval(err);
282 if (opt != NULL && opt != np->opt)
283 sock_kfree_s(sk, opt, opt->tot_len);
288 static void dccp_v6_reqsk_destructor(struct request_sock *req)
290 if (inet6_rsk(req)->pktopts != NULL)
291 kfree_skb(inet6_rsk(req)->pktopts);
294 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
296 struct ipv6hdr *rxip6h;
300 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
303 if (!ipv6_unicast_destination(rxskb))
306 skb = dccp_ctl_make_reset(dccp_v6_ctl_socket, rxskb);
310 rxip6h = ipv6_hdr(rxskb);
311 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
314 memset(&fl, 0, sizeof(fl));
315 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
316 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
318 fl.proto = IPPROTO_DCCP;
319 fl.oif = inet6_iif(rxskb);
320 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
321 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
322 security_skb_classify_flow(rxskb, &fl);
324 /* sk = NULL, but it is safe for now. RST socket required. */
325 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
326 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
327 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
328 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
329 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
337 static struct request_sock_ops dccp6_request_sock_ops = {
339 .obj_size = sizeof(struct dccp6_request_sock),
340 .rtx_syn_ack = dccp_v6_send_response,
341 .send_ack = dccp_reqsk_send_ack,
342 .destructor = dccp_v6_reqsk_destructor,
343 .send_reset = dccp_v6_ctl_send_reset,
346 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
348 const struct dccp_hdr *dh = dccp_hdr(skb);
349 const struct ipv6hdr *iph = ipv6_hdr(skb);
351 struct request_sock **prev;
352 /* Find possible connection requests. */
353 struct request_sock *req = inet6_csk_search_req(sk, &prev,
359 return dccp_check_req(sk, skb, req, prev);
361 nsk = __inet6_lookup_established(&init_net, &dccp_hashinfo,
362 &iph->saddr, dh->dccph_sport,
363 &iph->daddr, ntohs(dh->dccph_dport),
366 if (nsk->sk_state != DCCP_TIME_WAIT) {
370 inet_twsk_put(inet_twsk(nsk));
377 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
379 struct request_sock *req;
380 struct dccp_request_sock *dreq;
381 struct inet6_request_sock *ireq6;
382 struct ipv6_pinfo *np = inet6_sk(sk);
383 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
384 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
386 if (skb->protocol == htons(ETH_P_IP))
387 return dccp_v4_conn_request(sk, skb);
389 if (!ipv6_unicast_destination(skb))
390 return 0; /* discard, don't send a reset here */
392 if (dccp_bad_service_code(sk, service)) {
393 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
397 * There are no SYN attacks on IPv6, yet...
399 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
400 if (inet_csk_reqsk_queue_is_full(sk))
403 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
406 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
410 dccp_reqsk_init(req, skb);
412 dreq = dccp_rsk(req);
413 if (dccp_parse_options(sk, dreq, skb))
416 if (security_inet_conn_request(sk, skb, req))
419 ireq6 = inet6_rsk(req);
420 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
421 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
422 ireq6->pktopts = NULL;
424 if (ipv6_opt_accepted(sk, skb) ||
425 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
426 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
427 atomic_inc(&skb->users);
428 ireq6->pktopts = skb;
430 ireq6->iif = sk->sk_bound_dev_if;
432 /* So that link locals have meaning */
433 if (!sk->sk_bound_dev_if &&
434 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
435 ireq6->iif = inet6_iif(skb);
438 * Step 3: Process LISTEN state
440 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
442 * In fact we defer setting S.GSR, S.SWL, S.SWH to
443 * dccp_create_openreq_child.
445 dreq->dreq_isr = dcb->dccpd_seq;
446 dreq->dreq_iss = dccp_v6_init_sequence(skb);
447 dreq->dreq_service = service;
449 if (dccp_v6_send_response(sk, req))
452 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
458 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
462 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
464 struct request_sock *req,
465 struct dst_entry *dst)
467 struct inet6_request_sock *ireq6 = inet6_rsk(req);
468 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
469 struct inet_sock *newinet;
470 struct dccp_sock *newdp;
471 struct dccp6_sock *newdp6;
473 struct ipv6_txoptions *opt;
475 if (skb->protocol == htons(ETH_P_IP)) {
479 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
483 newdp6 = (struct dccp6_sock *)newsk;
484 newdp = dccp_sk(newsk);
485 newinet = inet_sk(newsk);
486 newinet->pinet6 = &newdp6->inet6;
487 newnp = inet6_sk(newsk);
489 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
491 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
494 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
497 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
499 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
500 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
501 newnp->pktoptions = NULL;
503 newnp->mcast_oif = inet6_iif(skb);
504 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
507 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
508 * here, dccp_create_openreq_child now does this for us, see the comment in
509 * that function for the gory details. -acme
512 /* It is tricky place. Until this moment IPv4 tcp
513 worked with IPv6 icsk.icsk_af_ops.
516 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
523 if (sk_acceptq_is_full(sk))
527 struct in6_addr *final_p = NULL, final;
530 memset(&fl, 0, sizeof(fl));
531 fl.proto = IPPROTO_DCCP;
532 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
533 if (opt != NULL && opt->srcrt != NULL) {
534 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
536 ipv6_addr_copy(&final, &fl.fl6_dst);
537 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
540 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
541 fl.oif = sk->sk_bound_dev_if;
542 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
543 fl.fl_ip_sport = inet_sk(sk)->sport;
544 security_sk_classify_flow(sk, &fl);
546 if (ip6_dst_lookup(sk, &dst, &fl))
550 ipv6_addr_copy(&fl.fl6_dst, final_p);
552 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
556 newsk = dccp_create_openreq_child(sk, req, skb);
561 * No need to charge this sock to the relevant IPv6 refcnt debug socks
562 * count here, dccp_create_openreq_child now does this for us, see the
563 * comment in that function for the gory details. -acme
566 __ip6_dst_store(newsk, dst, NULL, NULL);
567 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
569 newdp6 = (struct dccp6_sock *)newsk;
570 newinet = inet_sk(newsk);
571 newinet->pinet6 = &newdp6->inet6;
572 newdp = dccp_sk(newsk);
573 newnp = inet6_sk(newsk);
575 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
577 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
578 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
579 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
580 newsk->sk_bound_dev_if = ireq6->iif;
582 /* Now IPv6 options...
584 First: no IPv4 options.
589 newnp->rxopt.all = np->rxopt.all;
591 /* Clone pktoptions received with SYN */
592 newnp->pktoptions = NULL;
593 if (ireq6->pktopts != NULL) {
594 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
595 kfree_skb(ireq6->pktopts);
596 ireq6->pktopts = NULL;
597 if (newnp->pktoptions)
598 skb_set_owner_r(newnp->pktoptions, newsk);
601 newnp->mcast_oif = inet6_iif(skb);
602 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
605 * Clone native IPv6 options from listening socket (if any)
607 * Yes, keeping reference count would be much more clever, but we make
608 * one more one thing there: reattach optmem to newsk.
611 newnp->opt = ipv6_dup_options(newsk, opt);
613 sock_kfree_s(sk, opt, opt->tot_len);
616 inet_csk(newsk)->icsk_ext_hdr_len = 0;
617 if (newnp->opt != NULL)
618 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
619 newnp->opt->opt_flen);
621 dccp_sync_mss(newsk, dst_mtu(dst));
623 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
626 inet_inherit_port(sk, newsk);
631 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
633 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
634 if (opt != NULL && opt != np->opt)
635 sock_kfree_s(sk, opt, opt->tot_len);
640 /* The socket must have it's spinlock held when we get
643 * We have a potential double-lock case here, so even when
644 * doing backlog processing we use the BH locking scheme.
645 * This is because we cannot sleep with the original spinlock
648 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
650 struct ipv6_pinfo *np = inet6_sk(sk);
651 struct sk_buff *opt_skb = NULL;
653 /* Imagine: socket is IPv6. IPv4 packet arrives,
654 goes to IPv4 receive handler and backlogged.
655 From backlog it always goes here. Kerboom...
656 Fortunately, dccp_rcv_established and rcv_established
657 handle them correctly, but it is not case with
658 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
661 if (skb->protocol == htons(ETH_P_IP))
662 return dccp_v4_do_rcv(sk, skb);
664 if (sk_filter(sk, skb))
668 * socket locking is here for SMP purposes as backlog rcv is currently
669 * called with bh processing disabled.
672 /* Do Stevens' IPV6_PKTOPTIONS.
674 Yes, guys, it is the only place in our code, where we
675 may make it not affecting IPv4.
676 The rest of code is protocol independent,
677 and I do not like idea to uglify IPv4.
679 Actually, all the idea behind IPV6_PKTOPTIONS
680 looks not very well thought. For now we latch
681 options, received in the last packet, enqueued
682 by tcp. Feel free to propose better solution.
687 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
688 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
690 opt_skb = skb_clone(skb, GFP_ATOMIC);
692 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
693 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
696 /* XXX This is where we would goto ipv6_pktoptions. */
697 __kfree_skb(opt_skb);
703 * Step 3: Process LISTEN state
704 * If S.state == LISTEN,
705 * If P.type == Request or P contains a valid Init Cookie option,
706 * (* Must scan the packet's options to check for Init
707 * Cookies. Only Init Cookies are processed here,
708 * however; other options are processed in Step 8. This
709 * scan need only be performed if the endpoint uses Init
711 * (* Generate a new socket and switch to that socket *)
712 * Set S := new socket for this port pair
714 * Choose S.ISS (initial seqno) or set from Init Cookies
715 * Initialize S.GAR := S.ISS
716 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
717 * Continue with S.state == RESPOND
718 * (* A Response packet will be generated in Step 11 *)
720 * Generate Reset(No Connection) unless P.type == Reset
721 * Drop packet and return
723 * NOTE: the check for the packet types is done in
724 * dccp_rcv_state_process
726 if (sk->sk_state == DCCP_LISTEN) {
727 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
732 * Queue it on the new socket if the new socket is active,
733 * otherwise we just shortcircuit this and continue with
737 if (dccp_child_process(sk, nsk, skb))
740 __kfree_skb(opt_skb);
745 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
748 /* XXX This is where we would goto ipv6_pktoptions. */
749 __kfree_skb(opt_skb);
754 dccp_v6_ctl_send_reset(sk, skb);
757 __kfree_skb(opt_skb);
762 static int dccp_v6_rcv(struct sk_buff *skb)
764 const struct dccp_hdr *dh;
768 /* Step 1: Check header basics */
770 if (dccp_invalid_packet(skb))
773 /* Step 1: If header checksum is incorrect, drop packet and return. */
774 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
775 &ipv6_hdr(skb)->daddr)) {
776 DCCP_WARN("dropped packet with invalid checksum\n");
782 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
783 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
785 if (dccp_packet_without_ack(skb))
786 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
788 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
791 * Look up flow ID in table and get corresponding socket */
792 sk = __inet6_lookup(&init_net, &dccp_hashinfo, &ipv6_hdr(skb)->saddr,
794 &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
801 dccp_pr_debug("failed to look up flow ID in table and "
802 "get corresponding socket\n");
808 * ... or S.state == TIMEWAIT,
809 * Generate Reset(No Connection) unless P.type == Reset
810 * Drop packet and return
812 if (sk->sk_state == DCCP_TIME_WAIT) {
813 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
814 inet_twsk_put(inet_twsk(sk));
819 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
820 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
821 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
823 min_cov = dccp_sk(sk)->dccps_pcrlen;
824 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
825 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
826 dh->dccph_cscov, min_cov);
827 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
828 goto discard_and_relse;
831 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
832 goto discard_and_relse;
834 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
837 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
842 * Generate Reset(No Connection) unless P.type == Reset
843 * Drop packet and return
845 if (dh->dccph_type != DCCP_PKT_RESET) {
846 DCCP_SKB_CB(skb)->dccpd_reset_code =
847 DCCP_RESET_CODE_NO_CONNECTION;
848 dccp_v6_ctl_send_reset(sk, skb);
860 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
863 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
864 struct inet_connection_sock *icsk = inet_csk(sk);
865 struct inet_sock *inet = inet_sk(sk);
866 struct ipv6_pinfo *np = inet6_sk(sk);
867 struct dccp_sock *dp = dccp_sk(sk);
868 struct in6_addr *saddr = NULL, *final_p = NULL, final;
870 struct dst_entry *dst;
874 dp->dccps_role = DCCP_ROLE_CLIENT;
876 if (addr_len < SIN6_LEN_RFC2133)
879 if (usin->sin6_family != AF_INET6)
880 return -EAFNOSUPPORT;
882 memset(&fl, 0, sizeof(fl));
885 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
886 IP6_ECN_flow_init(fl.fl6_flowlabel);
887 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
888 struct ip6_flowlabel *flowlabel;
889 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
890 if (flowlabel == NULL)
892 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
893 fl6_sock_release(flowlabel);
897 * connect() to INADDR_ANY means loopback (BSD'ism).
899 if (ipv6_addr_any(&usin->sin6_addr))
900 usin->sin6_addr.s6_addr[15] = 1;
902 addr_type = ipv6_addr_type(&usin->sin6_addr);
904 if (addr_type & IPV6_ADDR_MULTICAST)
907 if (addr_type & IPV6_ADDR_LINKLOCAL) {
908 if (addr_len >= sizeof(struct sockaddr_in6) &&
909 usin->sin6_scope_id) {
910 /* If interface is set while binding, indices
913 if (sk->sk_bound_dev_if &&
914 sk->sk_bound_dev_if != usin->sin6_scope_id)
917 sk->sk_bound_dev_if = usin->sin6_scope_id;
920 /* Connect to link-local address requires an interface */
921 if (!sk->sk_bound_dev_if)
925 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
926 np->flow_label = fl.fl6_flowlabel;
931 if (addr_type == IPV6_ADDR_MAPPED) {
932 u32 exthdrlen = icsk->icsk_ext_hdr_len;
933 struct sockaddr_in sin;
935 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
937 if (__ipv6_only_sock(sk))
940 sin.sin_family = AF_INET;
941 sin.sin_port = usin->sin6_port;
942 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
944 icsk->icsk_af_ops = &dccp_ipv6_mapped;
945 sk->sk_backlog_rcv = dccp_v4_do_rcv;
947 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
949 icsk->icsk_ext_hdr_len = exthdrlen;
950 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
951 sk->sk_backlog_rcv = dccp_v6_do_rcv;
954 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
956 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
963 if (!ipv6_addr_any(&np->rcv_saddr))
964 saddr = &np->rcv_saddr;
966 fl.proto = IPPROTO_DCCP;
967 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
968 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
969 fl.oif = sk->sk_bound_dev_if;
970 fl.fl_ip_dport = usin->sin6_port;
971 fl.fl_ip_sport = inet->sport;
972 security_sk_classify_flow(sk, &fl);
974 if (np->opt != NULL && np->opt->srcrt != NULL) {
975 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
977 ipv6_addr_copy(&final, &fl.fl6_dst);
978 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
982 err = ip6_dst_lookup(sk, &dst, &fl);
987 ipv6_addr_copy(&fl.fl6_dst, final_p);
989 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
992 err = ip6_dst_blackhole(sk, &dst, &fl);
999 ipv6_addr_copy(&np->rcv_saddr, saddr);
1002 /* set the source address */
1003 ipv6_addr_copy(&np->saddr, saddr);
1004 inet->rcv_saddr = LOOPBACK4_IPV6;
1006 __ip6_dst_store(sk, dst, NULL, NULL);
1008 icsk->icsk_ext_hdr_len = 0;
1009 if (np->opt != NULL)
1010 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1011 np->opt->opt_nflen);
1013 inet->dport = usin->sin6_port;
1015 dccp_set_state(sk, DCCP_REQUESTING);
1016 err = inet6_hash_connect(&dccp_death_row, sk);
1020 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1021 np->daddr.s6_addr32,
1022 inet->sport, inet->dport);
1023 err = dccp_connect(sk);
1030 dccp_set_state(sk, DCCP_CLOSED);
1034 sk->sk_route_caps = 0;
1038 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1039 .queue_xmit = inet6_csk_xmit,
1040 .send_check = dccp_v6_send_check,
1041 .rebuild_header = inet6_sk_rebuild_header,
1042 .conn_request = dccp_v6_conn_request,
1043 .syn_recv_sock = dccp_v6_request_recv_sock,
1044 .net_header_len = sizeof(struct ipv6hdr),
1045 .setsockopt = ipv6_setsockopt,
1046 .getsockopt = ipv6_getsockopt,
1047 .addr2sockaddr = inet6_csk_addr2sockaddr,
1048 .sockaddr_len = sizeof(struct sockaddr_in6),
1049 .bind_conflict = inet6_csk_bind_conflict,
1050 #ifdef CONFIG_COMPAT
1051 .compat_setsockopt = compat_ipv6_setsockopt,
1052 .compat_getsockopt = compat_ipv6_getsockopt,
1057 * DCCP over IPv4 via INET6 API
1059 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1060 .queue_xmit = ip_queue_xmit,
1061 .send_check = dccp_v4_send_check,
1062 .rebuild_header = inet_sk_rebuild_header,
1063 .conn_request = dccp_v6_conn_request,
1064 .syn_recv_sock = dccp_v6_request_recv_sock,
1065 .net_header_len = sizeof(struct iphdr),
1066 .setsockopt = ipv6_setsockopt,
1067 .getsockopt = ipv6_getsockopt,
1068 .addr2sockaddr = inet6_csk_addr2sockaddr,
1069 .sockaddr_len = sizeof(struct sockaddr_in6),
1070 #ifdef CONFIG_COMPAT
1071 .compat_setsockopt = compat_ipv6_setsockopt,
1072 .compat_getsockopt = compat_ipv6_getsockopt,
1076 /* NOTE: A lot of things set to zero explicitly by call to
1077 * sk_alloc() so need not be done here.
1079 static int dccp_v6_init_sock(struct sock *sk)
1081 static __u8 dccp_v6_ctl_sock_initialized;
1082 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1085 if (unlikely(!dccp_v6_ctl_sock_initialized))
1086 dccp_v6_ctl_sock_initialized = 1;
1087 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1093 static int dccp_v6_destroy_sock(struct sock *sk)
1095 dccp_destroy_sock(sk);
1096 return inet6_destroy_sock(sk);
1099 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1100 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1103 DEFINE_PROTO_INUSE(dccp_v6)
1105 static struct proto dccp_v6_prot = {
1107 .owner = THIS_MODULE,
1108 .close = dccp_close,
1109 .connect = dccp_v6_connect,
1110 .disconnect = dccp_disconnect,
1111 .ioctl = dccp_ioctl,
1112 .init = dccp_v6_init_sock,
1113 .setsockopt = dccp_setsockopt,
1114 .getsockopt = dccp_getsockopt,
1115 .sendmsg = dccp_sendmsg,
1116 .recvmsg = dccp_recvmsg,
1117 .backlog_rcv = dccp_v6_do_rcv,
1118 .hash = dccp_v6_hash,
1119 .unhash = inet_unhash,
1120 .accept = inet_csk_accept,
1121 .get_port = inet_csk_get_port,
1122 .shutdown = dccp_shutdown,
1123 .destroy = dccp_v6_destroy_sock,
1124 .orphan_count = &dccp_orphan_count,
1125 .max_header = MAX_DCCP_HEADER,
1126 .obj_size = sizeof(struct dccp6_sock),
1127 .rsk_prot = &dccp6_request_sock_ops,
1128 .twsk_prot = &dccp6_timewait_sock_ops,
1129 .hashinfo = &dccp_hashinfo,
1130 #ifdef CONFIG_COMPAT
1131 .compat_setsockopt = compat_dccp_setsockopt,
1132 .compat_getsockopt = compat_dccp_getsockopt,
1134 REF_PROTO_INUSE(dccp_v6)
1137 static struct inet6_protocol dccp_v6_protocol = {
1138 .handler = dccp_v6_rcv,
1139 .err_handler = dccp_v6_err,
1140 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1143 static struct proto_ops inet6_dccp_ops = {
1145 .owner = THIS_MODULE,
1146 .release = inet6_release,
1148 .connect = inet_stream_connect,
1149 .socketpair = sock_no_socketpair,
1150 .accept = inet_accept,
1151 .getname = inet6_getname,
1153 .ioctl = inet6_ioctl,
1154 .listen = inet_dccp_listen,
1155 .shutdown = inet_shutdown,
1156 .setsockopt = sock_common_setsockopt,
1157 .getsockopt = sock_common_getsockopt,
1158 .sendmsg = inet_sendmsg,
1159 .recvmsg = sock_common_recvmsg,
1160 .mmap = sock_no_mmap,
1161 .sendpage = sock_no_sendpage,
1162 #ifdef CONFIG_COMPAT
1163 .compat_setsockopt = compat_sock_common_setsockopt,
1164 .compat_getsockopt = compat_sock_common_getsockopt,
1168 static struct inet_protosw dccp_v6_protosw = {
1170 .protocol = IPPROTO_DCCP,
1171 .prot = &dccp_v6_prot,
1172 .ops = &inet6_dccp_ops,
1174 .flags = INET_PROTOSW_ICSK,
1177 static int __init dccp_v6_init(void)
1179 int err = proto_register(&dccp_v6_prot, 1);
1184 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1186 goto out_unregister_proto;
1188 inet6_register_protosw(&dccp_v6_protosw);
1190 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1191 SOCK_DCCP, IPPROTO_DCCP);
1193 goto out_unregister_protosw;
1196 out_unregister_protosw:
1197 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1198 inet6_unregister_protosw(&dccp_v6_protosw);
1199 out_unregister_proto:
1200 proto_unregister(&dccp_v6_prot);
1204 static void __exit dccp_v6_exit(void)
1206 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1207 inet6_unregister_protosw(&dccp_v6_protosw);
1208 proto_unregister(&dccp_v6_prot);
1211 module_init(dccp_v6_init);
1212 module_exit(dccp_v6_exit);
1215 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1216 * values directly, Also cover the case where the protocol is not specified,
1217 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1219 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1220 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1221 MODULE_LICENSE("GPL");
1222 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1223 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");