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/config.h>
16 #include <linux/module.h>
17 #include <linux/random.h>
18 #include <linux/xfrm.h>
20 #include <net/addrconf.h>
21 #include <net/inet_common.h>
22 #include <net/inet_hashtables.h>
23 #include <net/inet_sock.h>
24 #include <net/inet6_connection_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/ip6_route.h>
28 #include <net/protocol.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_checksum.h>
36 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
39 static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
40 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
41 struct request_sock *req);
42 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
44 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
46 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
47 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
49 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
51 return inet_csk_get_port(&dccp_hashinfo, sk, snum,
52 inet6_csk_bind_conflict);
55 static void dccp_v6_hash(struct sock *sk)
57 if (sk->sk_state != DCCP_CLOSED) {
58 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
63 __inet6_hash(&dccp_hashinfo, sk);
68 static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
69 struct in6_addr *saddr,
70 struct in6_addr *daddr,
73 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
76 static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
78 const struct dccp_hdr *dh = dccp_hdr(skb);
80 if (skb->protocol == htons(ETH_P_IPV6))
81 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
82 skb->nh.ipv6h->saddr.s6_addr32,
86 return secure_dccp_sequence_number(skb->nh.iph->daddr,
92 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
95 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
96 struct inet_connection_sock *icsk = inet_csk(sk);
97 struct inet_sock *inet = inet_sk(sk);
98 struct ipv6_pinfo *np = inet6_sk(sk);
99 struct dccp_sock *dp = dccp_sk(sk);
100 struct in6_addr *saddr = NULL, *final_p = NULL, final;
102 struct dst_entry *dst;
106 dp->dccps_role = DCCP_ROLE_CLIENT;
108 if (addr_len < SIN6_LEN_RFC2133)
111 if (usin->sin6_family != AF_INET6)
112 return -EAFNOSUPPORT;
114 memset(&fl, 0, sizeof(fl));
117 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
118 IP6_ECN_flow_init(fl.fl6_flowlabel);
119 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
120 struct ip6_flowlabel *flowlabel;
121 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
122 if (flowlabel == NULL)
124 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
125 fl6_sock_release(flowlabel);
130 * connect() to INADDR_ANY means loopback (BSD'ism).
133 if (ipv6_addr_any(&usin->sin6_addr))
134 usin->sin6_addr.s6_addr[15] = 0x1;
136 addr_type = ipv6_addr_type(&usin->sin6_addr);
138 if(addr_type & IPV6_ADDR_MULTICAST)
141 if (addr_type & IPV6_ADDR_LINKLOCAL) {
142 if (addr_len >= sizeof(struct sockaddr_in6) &&
143 usin->sin6_scope_id) {
144 /* If interface is set while binding, indices
147 if (sk->sk_bound_dev_if &&
148 sk->sk_bound_dev_if != usin->sin6_scope_id)
151 sk->sk_bound_dev_if = usin->sin6_scope_id;
154 /* Connect to link-local address requires an interface */
155 if (!sk->sk_bound_dev_if)
159 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
160 np->flow_label = fl.fl6_flowlabel;
166 if (addr_type == IPV6_ADDR_MAPPED) {
167 u32 exthdrlen = icsk->icsk_ext_hdr_len;
168 struct sockaddr_in sin;
170 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
172 if (__ipv6_only_sock(sk))
175 sin.sin_family = AF_INET;
176 sin.sin_port = usin->sin6_port;
177 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
179 icsk->icsk_af_ops = &dccp_ipv6_mapped;
180 sk->sk_backlog_rcv = dccp_v4_do_rcv;
182 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
185 icsk->icsk_ext_hdr_len = exthdrlen;
186 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
187 sk->sk_backlog_rcv = dccp_v6_do_rcv;
190 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
192 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
199 if (!ipv6_addr_any(&np->rcv_saddr))
200 saddr = &np->rcv_saddr;
202 fl.proto = IPPROTO_DCCP;
203 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
204 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
205 fl.oif = sk->sk_bound_dev_if;
206 fl.fl_ip_dport = usin->sin6_port;
207 fl.fl_ip_sport = inet->sport;
209 if (np->opt && np->opt->srcrt) {
210 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
211 ipv6_addr_copy(&final, &fl.fl6_dst);
212 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
216 err = ip6_dst_lookup(sk, &dst, &fl);
220 ipv6_addr_copy(&fl.fl6_dst, final_p);
222 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
227 ipv6_addr_copy(&np->rcv_saddr, saddr);
230 /* set the source address */
231 ipv6_addr_copy(&np->saddr, saddr);
232 inet->rcv_saddr = LOOPBACK4_IPV6;
234 ip6_dst_store(sk, dst, NULL);
236 icsk->icsk_ext_hdr_len = 0;
238 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
241 inet->dport = usin->sin6_port;
243 dccp_set_state(sk, DCCP_REQUESTING);
244 err = inet6_hash_connect(&dccp_death_row, sk);
249 dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
254 err = dccp_connect(sk);
261 dccp_set_state(sk, DCCP_CLOSED);
265 sk->sk_route_caps = 0;
269 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
270 int type, int code, int offset, __be32 info)
272 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
273 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
274 struct ipv6_pinfo *np;
279 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
280 &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
283 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
287 if (sk->sk_state == DCCP_TIME_WAIT) {
288 inet_twsk_put((struct inet_timewait_sock *)sk);
293 if (sock_owned_by_user(sk))
294 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
296 if (sk->sk_state == DCCP_CLOSED)
301 if (type == ICMPV6_PKT_TOOBIG) {
302 struct dst_entry *dst = NULL;
304 if (sock_owned_by_user(sk))
306 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
309 /* icmp should have updated the destination cache entry */
310 dst = __sk_dst_check(sk, np->dst_cookie);
313 struct inet_sock *inet = inet_sk(sk);
316 /* BUGGG_FUTURE: Again, it is not clear how
317 to handle rthdr case. Ignore this complexity
320 memset(&fl, 0, sizeof(fl));
321 fl.proto = IPPROTO_DCCP;
322 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
323 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
324 fl.oif = sk->sk_bound_dev_if;
325 fl.fl_ip_dport = inet->dport;
326 fl.fl_ip_sport = inet->sport;
328 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
329 sk->sk_err_soft = -err;
333 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
334 sk->sk_err_soft = -err;
341 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
342 dccp_sync_mss(sk, dst_mtu(dst));
343 } /* else let the usual retransmit timer handle it */
348 icmpv6_err_convert(type, code, &err);
350 seq = DCCP_SKB_CB(skb)->dccpd_seq;
351 /* Might be for an request_sock */
352 switch (sk->sk_state) {
353 struct request_sock *req, **prev;
355 if (sock_owned_by_user(sk))
358 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
359 &hdr->daddr, &hdr->saddr,
364 /* ICMPs are not backlogged, hence we cannot get
365 * an established socket here.
367 BUG_TRAP(req->sk == NULL);
369 if (seq != dccp_rsk(req)->dreq_iss) {
370 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
374 inet_csk_reqsk_queue_drop(sk, req, prev);
377 case DCCP_REQUESTING:
378 case DCCP_RESPOND: /* Cannot happen.
379 It can, it SYNs are crossed. --ANK */
380 if (!sock_owned_by_user(sk)) {
381 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
384 * Wake people up to see the error
385 * (see connect in sock.c)
387 sk->sk_error_report(sk);
391 sk->sk_err_soft = err;
395 if (!sock_owned_by_user(sk) && np->recverr) {
397 sk->sk_error_report(sk);
399 sk->sk_err_soft = err;
407 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
408 struct dst_entry *dst)
410 struct inet6_request_sock *ireq6 = inet6_rsk(req);
411 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct ipv6_txoptions *opt = NULL;
414 struct in6_addr *final_p = NULL, final;
418 memset(&fl, 0, sizeof(fl));
419 fl.proto = IPPROTO_DCCP;
420 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
421 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
422 fl.fl6_flowlabel = 0;
424 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
425 fl.fl_ip_sport = inet_sk(sk)->sport;
430 np->rxopt.bits.osrcrt == 2 &&
432 struct sk_buff *pktopts = ireq6->pktopts;
433 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
435 opt = ipv6_invert_rthdr(sk,
436 (struct ipv6_rt_hdr *)(pktopts->nh.raw +
440 if (opt && opt->srcrt) {
441 struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
442 ipv6_addr_copy(&final, &fl.fl6_dst);
443 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
447 err = ip6_dst_lookup(sk, &dst, &fl);
451 ipv6_addr_copy(&fl.fl6_dst, final_p);
452 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
456 skb = dccp_make_response(sk, dst, req);
458 struct dccp_hdr *dh = dccp_hdr(skb);
459 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
462 csum_partial((char *)dh,
465 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
466 err = ip6_xmit(sk, skb, &fl, opt, 0);
467 if (err == NET_XMIT_CN)
472 if (opt && opt != np->opt)
473 sock_kfree_s(sk, opt, opt->tot_len);
478 static void dccp_v6_reqsk_destructor(struct request_sock *req)
480 if (inet6_rsk(req)->pktopts != NULL)
481 kfree_skb(inet6_rsk(req)->pktopts);
484 static struct request_sock_ops dccp6_request_sock_ops = {
486 .obj_size = sizeof(struct dccp6_request_sock),
487 .rtx_syn_ack = dccp_v6_send_response,
488 .send_ack = dccp_v6_reqsk_send_ack,
489 .destructor = dccp_v6_reqsk_destructor,
490 .send_reset = dccp_v6_ctl_send_reset,
493 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
494 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
497 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
499 struct ipv6_pinfo *np = inet6_sk(sk);
500 struct dccp_hdr *dh = dccp_hdr(skb);
502 dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
504 csum_partial((char *)dh,
509 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
511 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
512 const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
513 sizeof(struct dccp_hdr_ext) +
514 sizeof(struct dccp_hdr_reset);
519 if (rxdh->dccph_type == DCCP_PKT_RESET)
522 if (!ipv6_unicast_destination(rxskb))
526 * We need to grab some memory, and put together an RST,
527 * and then put it into the queue to be sent.
530 skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
531 dccp_hdr_reset_len, GFP_ATOMIC);
535 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
538 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
540 memset(dh, 0, dccp_hdr_reset_len);
542 /* Swap the send and the receive. */
543 dh->dccph_type = DCCP_PKT_RESET;
544 dh->dccph_sport = rxdh->dccph_dport;
545 dh->dccph_dport = rxdh->dccph_sport;
546 dh->dccph_doff = dccp_hdr_reset_len / 4;
548 dccp_hdr_reset(skb)->dccph_reset_code =
549 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
551 /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
553 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
554 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
556 dccp_hdr_set_seq(dh, seqno);
557 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
558 DCCP_SKB_CB(rxskb)->dccpd_seq);
560 memset(&fl, 0, sizeof(fl));
561 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
562 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
563 dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
564 sizeof(*dh), IPPROTO_DCCP,
566 fl.proto = IPPROTO_DCCP;
567 fl.oif = inet6_iif(rxskb);
568 fl.fl_ip_dport = dh->dccph_dport;
569 fl.fl_ip_sport = dh->dccph_sport;
571 /* sk = NULL, but it is safe for now. RST socket required. */
572 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
573 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
574 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
575 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
576 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
584 static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb)
587 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
588 const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
589 sizeof(struct dccp_hdr_ext) +
590 sizeof(struct dccp_hdr_ack_bits);
593 skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
594 dccp_hdr_ack_len, GFP_ATOMIC);
598 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
601 skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
603 memset(dh, 0, dccp_hdr_ack_len);
605 /* Build DCCP header and checksum it. */
606 dh->dccph_type = DCCP_PKT_ACK;
607 dh->dccph_sport = rxdh->dccph_dport;
608 dh->dccph_dport = rxdh->dccph_sport;
609 dh->dccph_doff = dccp_hdr_ack_len / 4;
612 dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
613 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
614 DCCP_SKB_CB(rxskb)->dccpd_seq);
616 memset(&fl, 0, sizeof(fl));
617 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
618 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
620 /* FIXME: calculate checksum, IPv4 also should... */
622 fl.proto = IPPROTO_DCCP;
623 fl.oif = inet6_iif(rxskb);
624 fl.fl_ip_dport = dh->dccph_dport;
625 fl.fl_ip_sport = dh->dccph_sport;
627 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
628 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
629 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
630 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
638 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
639 struct request_sock *req)
641 dccp_v6_ctl_send_ack(skb);
644 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
646 const struct dccp_hdr *dh = dccp_hdr(skb);
647 const struct ipv6hdr *iph = skb->nh.ipv6h;
649 struct request_sock **prev;
650 /* Find possible connection requests. */
651 struct request_sock *req = inet6_csk_search_req(sk, &prev,
657 return dccp_check_req(sk, skb, req, prev);
659 nsk = __inet6_lookup_established(&dccp_hashinfo,
660 &iph->saddr, dh->dccph_sport,
661 &iph->daddr, ntohs(dh->dccph_dport),
665 if (nsk->sk_state != DCCP_TIME_WAIT) {
669 inet_twsk_put((struct inet_timewait_sock *)nsk);
676 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
678 struct inet_request_sock *ireq;
680 struct request_sock *req;
681 struct dccp_request_sock *dreq;
682 struct inet6_request_sock *ireq6;
683 struct ipv6_pinfo *np = inet6_sk(sk);
684 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
685 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
686 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
688 if (skb->protocol == htons(ETH_P_IP))
689 return dccp_v4_conn_request(sk, skb);
691 if (!ipv6_unicast_destination(skb))
694 if (dccp_bad_service_code(sk, service)) {
695 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
699 * There are no SYN attacks on IPv6, yet...
701 if (inet_csk_reqsk_queue_is_full(sk))
704 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
707 req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
711 /* FIXME: process options */
713 dccp_openreq_init(req, &dp, skb);
715 ireq6 = inet6_rsk(req);
716 ireq = inet_rsk(req);
717 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
718 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
719 req->rcv_wnd = 100; /* Fake, option parsing will get the
721 ireq6->pktopts = NULL;
723 if (ipv6_opt_accepted(sk, skb) ||
724 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
725 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
726 atomic_inc(&skb->users);
727 ireq6->pktopts = skb;
729 ireq6->iif = sk->sk_bound_dev_if;
731 /* So that link locals have meaning */
732 if (!sk->sk_bound_dev_if &&
733 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
734 ireq6->iif = inet6_iif(skb);
737 * Step 3: Process LISTEN state
739 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
741 * In fact we defer setting S.GSR, S.SWL, S.SWH to
742 * dccp_create_openreq_child.
744 dreq = dccp_rsk(req);
745 dreq->dreq_isr = dcb->dccpd_seq;
746 dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
747 dreq->dreq_service = service;
749 if (dccp_v6_send_response(sk, req, NULL))
752 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
758 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
759 dcb->dccpd_reset_code = reset_code;
763 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
765 struct request_sock *req,
766 struct dst_entry *dst)
768 struct inet6_request_sock *ireq6 = inet6_rsk(req);
769 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
770 struct inet_sock *newinet;
771 struct dccp_sock *newdp;
772 struct dccp6_sock *newdp6;
774 struct ipv6_txoptions *opt;
776 if (skb->protocol == htons(ETH_P_IP)) {
781 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
785 newdp6 = (struct dccp6_sock *)newsk;
786 newdp = dccp_sk(newsk);
787 newinet = inet_sk(newsk);
788 newinet->pinet6 = &newdp6->inet6;
789 newnp = inet6_sk(newsk);
791 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
793 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
796 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
799 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
801 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
802 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
803 newnp->pktoptions = NULL;
805 newnp->mcast_oif = inet6_iif(skb);
806 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
809 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
810 * here, dccp_create_openreq_child now does this for us, see the comment in
811 * that function for the gory details. -acme
814 /* It is tricky place. Until this moment IPv4 tcp
815 worked with IPv6 icsk.icsk_af_ops.
818 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
825 if (sk_acceptq_is_full(sk))
828 if (np->rxopt.bits.osrcrt == 2 &&
829 opt == NULL && ireq6->pktopts) {
830 struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
832 opt = ipv6_invert_rthdr(sk,
833 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
838 struct in6_addr *final_p = NULL, final;
841 memset(&fl, 0, sizeof(fl));
842 fl.proto = IPPROTO_DCCP;
843 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
844 if (opt && opt->srcrt) {
845 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
846 ipv6_addr_copy(&final, &fl.fl6_dst);
847 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
850 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
851 fl.oif = sk->sk_bound_dev_if;
852 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
853 fl.fl_ip_sport = inet_sk(sk)->sport;
855 if (ip6_dst_lookup(sk, &dst, &fl))
859 ipv6_addr_copy(&fl.fl6_dst, final_p);
861 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
865 newsk = dccp_create_openreq_child(sk, req, skb);
870 * No need to charge this sock to the relevant IPv6 refcnt debug socks
871 * count here, dccp_create_openreq_child now does this for us, see the
872 * comment in that function for the gory details. -acme
875 ip6_dst_store(newsk, dst, NULL);
876 newsk->sk_route_caps = dst->dev->features &
877 ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
879 newdp6 = (struct dccp6_sock *)newsk;
880 newinet = inet_sk(newsk);
881 newinet->pinet6 = &newdp6->inet6;
882 newdp = dccp_sk(newsk);
883 newnp = inet6_sk(newsk);
885 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
887 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
888 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
889 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
890 newsk->sk_bound_dev_if = ireq6->iif;
892 /* Now IPv6 options...
894 First: no IPv4 options.
899 newnp->rxopt.all = np->rxopt.all;
901 /* Clone pktoptions received with SYN */
902 newnp->pktoptions = NULL;
903 if (ireq6->pktopts != NULL) {
904 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
905 kfree_skb(ireq6->pktopts);
906 ireq6->pktopts = NULL;
907 if (newnp->pktoptions)
908 skb_set_owner_r(newnp->pktoptions, newsk);
911 newnp->mcast_oif = inet6_iif(skb);
912 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
914 /* Clone native IPv6 options from listening socket (if any)
916 Yes, keeping reference count would be much more clever,
917 but we make one more one thing there: reattach optmem
921 newnp->opt = ipv6_dup_options(newsk, opt);
923 sock_kfree_s(sk, opt, opt->tot_len);
926 inet_csk(newsk)->icsk_ext_hdr_len = 0;
928 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
929 newnp->opt->opt_flen);
931 dccp_sync_mss(newsk, dst_mtu(dst));
933 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
935 __inet6_hash(&dccp_hashinfo, newsk);
936 inet_inherit_port(&dccp_hashinfo, sk, newsk);
941 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
943 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
944 if (opt && opt != np->opt)
945 sock_kfree_s(sk, opt, opt->tot_len);
950 /* The socket must have it's spinlock held when we get
953 * We have a potential double-lock case here, so even when
954 * doing backlog processing we use the BH locking scheme.
955 * This is because we cannot sleep with the original spinlock
958 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
960 struct ipv6_pinfo *np = inet6_sk(sk);
961 struct sk_buff *opt_skb = NULL;
963 /* Imagine: socket is IPv6. IPv4 packet arrives,
964 goes to IPv4 receive handler and backlogged.
965 From backlog it always goes here. Kerboom...
966 Fortunately, dccp_rcv_established and rcv_established
967 handle them correctly, but it is not case with
968 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
971 if (skb->protocol == htons(ETH_P_IP))
972 return dccp_v4_do_rcv(sk, skb);
974 if (sk_filter(sk, skb, 0))
978 * socket locking is here for SMP purposes as backlog rcv
979 * is currently called with bh processing disabled.
982 /* Do Stevens' IPV6_PKTOPTIONS.
984 Yes, guys, it is the only place in our code, where we
985 may make it not affecting IPv4.
986 The rest of code is protocol independent,
987 and I do not like idea to uglify IPv4.
989 Actually, all the idea behind IPV6_PKTOPTIONS
990 looks not very well thought. For now we latch
991 options, received in the last packet, enqueued
992 by tcp. Feel free to propose better solution.
996 opt_skb = skb_clone(skb, GFP_ATOMIC);
998 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
999 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
1004 if (sk->sk_state == DCCP_LISTEN) {
1005 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1010 * Queue it on the new socket if the new socket is active,
1011 * otherwise we just shortcircuit this and continue with
1015 if (dccp_child_process(sk, nsk, skb))
1018 __kfree_skb(opt_skb);
1023 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1028 dccp_v6_ctl_send_reset(skb);
1031 __kfree_skb(opt_skb);
1036 static int dccp_v6_rcv(struct sk_buff **pskb)
1038 const struct dccp_hdr *dh;
1039 struct sk_buff *skb = *pskb;
1042 /* Step 1: Check header basics: */
1044 if (dccp_invalid_packet(skb))
1049 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1050 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1052 if (dccp_packet_without_ack(skb))
1053 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1055 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1058 * Look up flow ID in table and get corresponding socket */
1059 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1061 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1066 * Generate Reset(No Connection) unless P.type == Reset
1067 * Drop packet and return
1070 goto no_dccp_socket;
1074 * ... or S.state == TIMEWAIT,
1075 * Generate Reset(No Connection) unless P.type == Reset
1076 * Drop packet and return
1079 if (sk->sk_state == DCCP_TIME_WAIT)
1082 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1083 goto discard_and_relse;
1085 return sk_receive_skb(sk, skb) ? -1 : 0;
1088 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1092 * Generate Reset(No Connection) unless P.type == Reset
1093 * Drop packet and return
1095 if (dh->dccph_type != DCCP_PKT_RESET) {
1096 DCCP_SKB_CB(skb)->dccpd_reset_code =
1097 DCCP_RESET_CODE_NO_CONNECTION;
1098 dccp_v6_ctl_send_reset(skb);
1114 inet_twsk_put((struct inet_timewait_sock *)sk);
1115 goto no_dccp_socket;
1118 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1119 .queue_xmit = inet6_csk_xmit,
1120 .send_check = dccp_v6_send_check,
1121 .rebuild_header = inet6_sk_rebuild_header,
1122 .conn_request = dccp_v6_conn_request,
1123 .syn_recv_sock = dccp_v6_request_recv_sock,
1124 .net_header_len = sizeof(struct ipv6hdr),
1125 .setsockopt = ipv6_setsockopt,
1126 .getsockopt = ipv6_getsockopt,
1127 .addr2sockaddr = inet6_csk_addr2sockaddr,
1128 .sockaddr_len = sizeof(struct sockaddr_in6)
1132 * DCCP over IPv4 via INET6 API
1134 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1135 .queue_xmit = ip_queue_xmit,
1136 .send_check = dccp_v4_send_check,
1137 .rebuild_header = inet_sk_rebuild_header,
1138 .conn_request = dccp_v6_conn_request,
1139 .syn_recv_sock = dccp_v6_request_recv_sock,
1140 .net_header_len = sizeof(struct iphdr),
1141 .setsockopt = ipv6_setsockopt,
1142 .getsockopt = ipv6_getsockopt,
1143 .addr2sockaddr = inet6_csk_addr2sockaddr,
1144 .sockaddr_len = sizeof(struct sockaddr_in6)
1147 /* NOTE: A lot of things set to zero explicitly by call to
1148 * sk_alloc() so need not be done here.
1150 static int dccp_v6_init_sock(struct sock *sk)
1152 static __u8 dccp_v6_ctl_sock_initialized;
1153 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1156 if (unlikely(!dccp_v6_ctl_sock_initialized))
1157 dccp_v6_ctl_sock_initialized = 1;
1158 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1164 static int dccp_v6_destroy_sock(struct sock *sk)
1166 dccp_destroy_sock(sk);
1167 return inet6_destroy_sock(sk);
1170 static struct proto dccp_v6_prot = {
1172 .owner = THIS_MODULE,
1173 .close = dccp_close,
1174 .connect = dccp_v6_connect,
1175 .disconnect = dccp_disconnect,
1176 .ioctl = dccp_ioctl,
1177 .init = dccp_v6_init_sock,
1178 .setsockopt = dccp_setsockopt,
1179 .getsockopt = dccp_getsockopt,
1180 .sendmsg = dccp_sendmsg,
1181 .recvmsg = dccp_recvmsg,
1182 .backlog_rcv = dccp_v6_do_rcv,
1183 .hash = dccp_v6_hash,
1184 .unhash = dccp_unhash,
1185 .accept = inet_csk_accept,
1186 .get_port = dccp_v6_get_port,
1187 .shutdown = dccp_shutdown,
1188 .destroy = dccp_v6_destroy_sock,
1189 .orphan_count = &dccp_orphan_count,
1190 .max_header = MAX_DCCP_HEADER,
1191 .obj_size = sizeof(struct dccp6_sock),
1192 .rsk_prot = &dccp6_request_sock_ops,
1193 .twsk_prot = &dccp6_timewait_sock_ops,
1196 static struct inet6_protocol dccp_v6_protocol = {
1197 .handler = dccp_v6_rcv,
1198 .err_handler = dccp_v6_err,
1199 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1202 static struct proto_ops inet6_dccp_ops = {
1204 .owner = THIS_MODULE,
1205 .release = inet6_release,
1207 .connect = inet_stream_connect,
1208 .socketpair = sock_no_socketpair,
1209 .accept = inet_accept,
1210 .getname = inet6_getname,
1212 .ioctl = inet6_ioctl,
1213 .listen = inet_dccp_listen,
1214 .shutdown = inet_shutdown,
1215 .setsockopt = sock_common_setsockopt,
1216 .getsockopt = sock_common_getsockopt,
1217 .sendmsg = inet_sendmsg,
1218 .recvmsg = sock_common_recvmsg,
1219 .mmap = sock_no_mmap,
1220 .sendpage = sock_no_sendpage,
1223 static struct inet_protosw dccp_v6_protosw = {
1225 .protocol = IPPROTO_DCCP,
1226 .prot = &dccp_v6_prot,
1227 .ops = &inet6_dccp_ops,
1229 .flags = INET_PROTOSW_ICSK,
1232 static int __init dccp_v6_init(void)
1234 int err = proto_register(&dccp_v6_prot, 1);
1239 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1241 goto out_unregister_proto;
1243 inet6_register_protosw(&dccp_v6_protosw);
1245 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1246 SOCK_DCCP, IPPROTO_DCCP);
1248 goto out_unregister_protosw;
1251 out_unregister_protosw:
1252 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1253 inet6_unregister_protosw(&dccp_v6_protosw);
1254 out_unregister_proto:
1255 proto_unregister(&dccp_v6_prot);
1259 static void __exit dccp_v6_exit(void)
1261 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1262 inet6_unregister_protosw(&dccp_v6_protosw);
1263 proto_unregister(&dccp_v6_prot);
1266 module_init(dccp_v6_init);
1267 module_exit(dccp_v6_exit);
1270 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1271 * values directly, Also cover the case where the protocol is not specified,
1272 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1274 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1275 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1276 MODULE_LICENSE("GPL");
1277 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1278 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");