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 /* dccp_v6_ctl_sk is used for sending RSTs and ACKs */
38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped
;
39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops
;
41 static void dccp_v6_hash(struct sock
*sk
)
43 if (sk
->sk_state
!= DCCP_CLOSED
) {
44 if (inet_csk(sk
)->icsk_af_ops
== &dccp_ipv6_mapped
) {
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
)
59 return csum_ipv6_magic(saddr
, daddr
, skb
->len
, IPPROTO_DCCP
, skb
->csum
);
62 static inline void dccp_v6_send_check(struct sock
*sk
, int unused_value
,
65 struct ipv6_pinfo
*np
= inet6_sk(sk
);
66 struct dccp_hdr
*dh
= dccp_hdr(skb
);
68 dccp_csum_outgoing(skb
);
69 dh
->dccph_checksum
= dccp_v6_csum_finish(skb
, &np
->saddr
, &np
->daddr
);
72 static inline __u32
secure_dccpv6_sequence_number(__be32
*saddr
, __be32
*daddr
,
73 __be16 sport
, __be16 dport
)
75 return secure_tcpv6_sequence_number(saddr
, daddr
, sport
, dport
);
78 static inline __u32
dccp_v6_init_sequence(struct sk_buff
*skb
)
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
);
87 static void dccp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
88 int type
, int code
, int offset
, __be32 info
)
90 struct ipv6hdr
*hdr
= (struct ipv6hdr
*)skb
->data
;
91 const struct dccp_hdr
*dh
= (struct dccp_hdr
*)(skb
->data
+ offset
);
92 struct ipv6_pinfo
*np
;
97 sk
= inet6_lookup(&init_net
, &dccp_hashinfo
, &hdr
->daddr
, dh
->dccph_dport
,
98 &hdr
->saddr
, dh
->dccph_sport
, inet6_iif(skb
));
101 ICMP6_INC_STATS_BH(__in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
105 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
106 inet_twsk_put(inet_twsk(sk
));
111 if (sock_owned_by_user(sk
))
112 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS
);
114 if (sk
->sk_state
== DCCP_CLOSED
)
119 if (type
== ICMPV6_PKT_TOOBIG
) {
120 struct dst_entry
*dst
= NULL
;
122 if (sock_owned_by_user(sk
))
124 if ((1 << sk
->sk_state
) & (DCCPF_LISTEN
| DCCPF_CLOSED
))
127 /* icmp should have updated the destination cache entry */
128 dst
= __sk_dst_check(sk
, np
->dst_cookie
);
130 struct inet_sock
*inet
= inet_sk(sk
);
133 /* BUGGG_FUTURE: Again, it is not clear how
134 to handle rthdr case. Ignore this complexity
137 memset(&fl
, 0, sizeof(fl
));
138 fl
.proto
= IPPROTO_DCCP
;
139 ipv6_addr_copy(&fl
.fl6_dst
, &np
->daddr
);
140 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
141 fl
.oif
= sk
->sk_bound_dev_if
;
142 fl
.fl_ip_dport
= inet
->dport
;
143 fl
.fl_ip_sport
= inet
->sport
;
144 security_sk_classify_flow(sk
, &fl
);
146 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
148 sk
->sk_err_soft
= -err
;
152 err
= xfrm_lookup(&dst
, &fl
, sk
, 0);
154 sk
->sk_err_soft
= -err
;
160 if (inet_csk(sk
)->icsk_pmtu_cookie
> dst_mtu(dst
)) {
161 dccp_sync_mss(sk
, dst_mtu(dst
));
162 } /* else let the usual retransmit timer handle it */
167 icmpv6_err_convert(type
, code
, &err
);
169 seq
= dccp_hdr_seq(dh
);
170 /* Might be for an request_sock */
171 switch (sk
->sk_state
) {
172 struct request_sock
*req
, **prev
;
174 if (sock_owned_by_user(sk
))
177 req
= inet6_csk_search_req(sk
, &prev
, dh
->dccph_dport
,
178 &hdr
->daddr
, &hdr
->saddr
,
184 * ICMPs are not backlogged, hence we cannot get an established
187 BUG_TRAP(req
->sk
== NULL
);
189 if (seq
!= dccp_rsk(req
)->dreq_iss
) {
190 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS
);
194 inet_csk_reqsk_queue_drop(sk
, req
, prev
);
197 case DCCP_REQUESTING
:
198 case DCCP_RESPOND
: /* Cannot happen.
199 It can, it SYNs are crossed. --ANK */
200 if (!sock_owned_by_user(sk
)) {
201 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
204 * Wake people up to see the error
205 * (see connect in sock.c)
207 sk
->sk_error_report(sk
);
210 sk
->sk_err_soft
= err
;
214 if (!sock_owned_by_user(sk
) && np
->recverr
) {
216 sk
->sk_error_report(sk
);
218 sk
->sk_err_soft
= err
;
226 static int dccp_v6_send_response(struct sock
*sk
, struct request_sock
*req
)
228 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
229 struct ipv6_pinfo
*np
= inet6_sk(sk
);
231 struct ipv6_txoptions
*opt
= NULL
;
232 struct in6_addr
*final_p
= NULL
, final
;
235 struct dst_entry
*dst
;
237 memset(&fl
, 0, sizeof(fl
));
238 fl
.proto
= IPPROTO_DCCP
;
239 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
240 ipv6_addr_copy(&fl
.fl6_src
, &ireq6
->loc_addr
);
241 fl
.fl6_flowlabel
= 0;
243 fl
.fl_ip_dport
= inet_rsk(req
)->rmt_port
;
244 fl
.fl_ip_sport
= inet_sk(sk
)->sport
;
245 security_req_classify_flow(req
, &fl
);
249 if (opt
!= NULL
&& opt
->srcrt
!= NULL
) {
250 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)opt
->srcrt
;
252 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
253 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
257 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
262 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
264 err
= xfrm_lookup(&dst
, &fl
, sk
, 0);
268 skb
= dccp_make_response(sk
, dst
, req
);
270 struct dccp_hdr
*dh
= dccp_hdr(skb
);
272 dh
->dccph_checksum
= dccp_v6_csum_finish(skb
,
275 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
276 err
= ip6_xmit(sk
, skb
, &fl
, opt
, 0);
277 err
= net_xmit_eval(err
);
281 if (opt
!= NULL
&& opt
!= np
->opt
)
282 sock_kfree_s(sk
, opt
, opt
->tot_len
);
287 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
289 if (inet6_rsk(req
)->pktopts
!= NULL
)
290 kfree_skb(inet6_rsk(req
)->pktopts
);
293 static void dccp_v6_ctl_send_reset(struct sock
*sk
, struct sk_buff
*rxskb
)
295 struct ipv6hdr
*rxip6h
;
298 struct sock
*ctl_sk
= init_net
.dccp
.v6_ctl_sk
;
300 if (dccp_hdr(rxskb
)->dccph_type
== DCCP_PKT_RESET
)
303 if (!ipv6_unicast_destination(rxskb
))
306 skb
= dccp_ctl_make_reset(ctl_sk
, 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(ctl_sk
, &skb
->dst
, &fl
)) {
326 if (xfrm_lookup(&skb
->dst
, &fl
, NULL
, 0) >= 0) {
327 ip6_xmit(ctl_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 static struct proto dccp_v6_prot
= {
1105 .owner
= THIS_MODULE
,
1106 .close
= dccp_close
,
1107 .connect
= dccp_v6_connect
,
1108 .disconnect
= dccp_disconnect
,
1109 .ioctl
= dccp_ioctl
,
1110 .init
= dccp_v6_init_sock
,
1111 .setsockopt
= dccp_setsockopt
,
1112 .getsockopt
= dccp_getsockopt
,
1113 .sendmsg
= dccp_sendmsg
,
1114 .recvmsg
= dccp_recvmsg
,
1115 .backlog_rcv
= dccp_v6_do_rcv
,
1116 .hash
= dccp_v6_hash
,
1117 .unhash
= inet_unhash
,
1118 .accept
= inet_csk_accept
,
1119 .get_port
= inet_csk_get_port
,
1120 .shutdown
= dccp_shutdown
,
1121 .destroy
= dccp_v6_destroy_sock
,
1122 .orphan_count
= &dccp_orphan_count
,
1123 .max_header
= MAX_DCCP_HEADER
,
1124 .obj_size
= sizeof(struct dccp6_sock
),
1125 .rsk_prot
= &dccp6_request_sock_ops
,
1126 .twsk_prot
= &dccp6_timewait_sock_ops
,
1127 .h
.hashinfo
= &dccp_hashinfo
,
1128 #ifdef CONFIG_COMPAT
1129 .compat_setsockopt
= compat_dccp_setsockopt
,
1130 .compat_getsockopt
= compat_dccp_getsockopt
,
1134 static struct inet6_protocol dccp_v6_protocol
= {
1135 .handler
= dccp_v6_rcv
,
1136 .err_handler
= dccp_v6_err
,
1137 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1140 static struct proto_ops inet6_dccp_ops
= {
1142 .owner
= THIS_MODULE
,
1143 .release
= inet6_release
,
1145 .connect
= inet_stream_connect
,
1146 .socketpair
= sock_no_socketpair
,
1147 .accept
= inet_accept
,
1148 .getname
= inet6_getname
,
1150 .ioctl
= inet6_ioctl
,
1151 .listen
= inet_dccp_listen
,
1152 .shutdown
= inet_shutdown
,
1153 .setsockopt
= sock_common_setsockopt
,
1154 .getsockopt
= sock_common_getsockopt
,
1155 .sendmsg
= inet_sendmsg
,
1156 .recvmsg
= sock_common_recvmsg
,
1157 .mmap
= sock_no_mmap
,
1158 .sendpage
= sock_no_sendpage
,
1159 #ifdef CONFIG_COMPAT
1160 .compat_setsockopt
= compat_sock_common_setsockopt
,
1161 .compat_getsockopt
= compat_sock_common_getsockopt
,
1165 static struct inet_protosw dccp_v6_protosw
= {
1167 .protocol
= IPPROTO_DCCP
,
1168 .prot
= &dccp_v6_prot
,
1169 .ops
= &inet6_dccp_ops
,
1171 .flags
= INET_PROTOSW_ICSK
,
1174 static int dccp_v6_init_net(struct net
*net
)
1179 static void dccp_v6_exit_net(struct net
*net
)
1183 static struct pernet_operations dccp_v6_ops
= {
1184 .init
= dccp_v6_init_net
,
1185 .exit
= dccp_v6_exit_net
,
1188 static int __init
dccp_v6_init(void)
1190 int err
= proto_register(&dccp_v6_prot
, 1);
1195 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1197 goto out_unregister_proto
;
1199 inet6_register_protosw(&dccp_v6_protosw
);
1201 err
= inet_ctl_sock_create(&init_net
.dccp
.v6_ctl_sk
, PF_INET6
,
1202 SOCK_DCCP
, IPPROTO_DCCP
, &init_net
);
1204 goto out_unregister_protosw
;
1206 err
= register_pernet_subsys(&dccp_v6_ops
);
1208 goto out_destroy_ctl_sock
;
1212 out_destroy_ctl_sock
:
1213 inet_ctl_sock_destroy(init_net
.dccp
.v6_ctl_sk
);
1214 out_unregister_protosw
:
1215 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1216 inet6_unregister_protosw(&dccp_v6_protosw
);
1217 out_unregister_proto
:
1218 proto_unregister(&dccp_v6_prot
);
1222 static void __exit
dccp_v6_exit(void)
1224 unregister_pernet_subsys(&dccp_v6_ops
);
1225 inet_ctl_sock_destroy(init_net
.dccp
.v6_ctl_sk
);
1226 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1227 inet6_unregister_protosw(&dccp_v6_protosw
);
1228 proto_unregister(&dccp_v6_prot
);
1231 module_init(dccp_v6_init
);
1232 module_exit(dccp_v6_exit
);
1235 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1236 * values directly, Also cover the case where the protocol is not specified,
1237 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1239 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1240 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1241 MODULE_LICENSE("GPL");
1242 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1243 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");