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>
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>
37 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
39 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
;
40 static const 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
) {
50 __inet6_hash(sk
, NULL
);
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 u8 type
, u8 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
);
94 struct ipv6_pinfo
*np
;
98 struct net
*net
= dev_net(skb
->dev
);
100 if (skb
->len
< offset
+ sizeof(*dh
) ||
101 skb
->len
< offset
+ __dccp_basic_hdr_len(dh
)) {
102 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
107 sk
= inet6_lookup(net
, &dccp_hashinfo
,
108 &hdr
->daddr
, dh
->dccph_dport
,
109 &hdr
->saddr
, dh
->dccph_sport
, inet6_iif(skb
));
112 ICMP6_INC_STATS_BH(net
, __in6_dev_get(skb
->dev
),
117 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
118 inet_twsk_put(inet_twsk(sk
));
123 if (sock_owned_by_user(sk
))
124 NET_INC_STATS_BH(net
, LINUX_MIB_LOCKDROPPEDICMPS
);
126 if (sk
->sk_state
== DCCP_CLOSED
)
130 seq
= dccp_hdr_seq(dh
);
131 if ((1 << sk
->sk_state
) & ~(DCCPF_REQUESTING
| DCCPF_LISTEN
) &&
132 !between48(seq
, dp
->dccps_awl
, dp
->dccps_awh
)) {
133 NET_INC_STATS_BH(net
, LINUX_MIB_OUTOFWINDOWICMPS
);
139 if (type
== ICMPV6_PKT_TOOBIG
) {
140 struct dst_entry
*dst
= NULL
;
142 if (sock_owned_by_user(sk
))
144 if ((1 << sk
->sk_state
) & (DCCPF_LISTEN
| DCCPF_CLOSED
))
147 /* icmp should have updated the destination cache entry */
148 dst
= __sk_dst_check(sk
, np
->dst_cookie
);
150 struct inet_sock
*inet
= inet_sk(sk
);
153 /* BUGGG_FUTURE: Again, it is not clear how
154 to handle rthdr case. Ignore this complexity
157 memset(&fl
, 0, sizeof(fl
));
158 fl
.proto
= IPPROTO_DCCP
;
159 ipv6_addr_copy(&fl
.fl6_dst
, &np
->daddr
);
160 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
161 fl
.oif
= sk
->sk_bound_dev_if
;
162 fl
.fl_ip_dport
= inet
->inet_dport
;
163 fl
.fl_ip_sport
= inet
->inet_sport
;
164 security_sk_classify_flow(sk
, &fl
);
166 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
168 sk
->sk_err_soft
= -err
;
172 err
= xfrm_lookup(net
, &dst
, &fl
, sk
, 0);
174 sk
->sk_err_soft
= -err
;
180 if (inet_csk(sk
)->icsk_pmtu_cookie
> dst_mtu(dst
)) {
181 dccp_sync_mss(sk
, dst_mtu(dst
));
182 } /* else let the usual retransmit timer handle it */
187 icmpv6_err_convert(type
, code
, &err
);
189 /* Might be for an request_sock */
190 switch (sk
->sk_state
) {
191 struct request_sock
*req
, **prev
;
193 if (sock_owned_by_user(sk
))
196 req
= inet6_csk_search_req(sk
, &prev
, dh
->dccph_dport
,
197 &hdr
->daddr
, &hdr
->saddr
,
203 * ICMPs are not backlogged, hence we cannot get an established
206 WARN_ON(req
->sk
!= NULL
);
208 if (seq
!= dccp_rsk(req
)->dreq_iss
) {
209 NET_INC_STATS_BH(net
, LINUX_MIB_OUTOFWINDOWICMPS
);
213 inet_csk_reqsk_queue_drop(sk
, req
, prev
);
216 case DCCP_REQUESTING
:
217 case DCCP_RESPOND
: /* Cannot happen.
218 It can, it SYNs are crossed. --ANK */
219 if (!sock_owned_by_user(sk
)) {
220 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
223 * Wake people up to see the error
224 * (see connect in sock.c)
226 sk
->sk_error_report(sk
);
229 sk
->sk_err_soft
= err
;
233 if (!sock_owned_by_user(sk
) && np
->recverr
) {
235 sk
->sk_error_report(sk
);
237 sk
->sk_err_soft
= err
;
245 static int dccp_v6_send_response(struct sock
*sk
, struct request_sock
*req
,
246 struct request_values
*rv_unused
)
248 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
249 struct ipv6_pinfo
*np
= inet6_sk(sk
);
251 struct ipv6_txoptions
*opt
= NULL
;
252 struct in6_addr
*final_p
= NULL
, final
;
255 struct dst_entry
*dst
;
257 memset(&fl
, 0, sizeof(fl
));
258 fl
.proto
= IPPROTO_DCCP
;
259 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
260 ipv6_addr_copy(&fl
.fl6_src
, &ireq6
->loc_addr
);
261 fl
.fl6_flowlabel
= 0;
263 fl
.fl_ip_dport
= inet_rsk(req
)->rmt_port
;
264 fl
.fl_ip_sport
= inet_rsk(req
)->loc_port
;
265 security_req_classify_flow(req
, &fl
);
269 if (opt
!= NULL
&& opt
->srcrt
!= NULL
) {
270 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)opt
->srcrt
;
272 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
273 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
277 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
282 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
284 err
= xfrm_lookup(sock_net(sk
), &dst
, &fl
, sk
, 0);
288 skb
= dccp_make_response(sk
, dst
, req
);
290 struct dccp_hdr
*dh
= dccp_hdr(skb
);
292 dh
->dccph_checksum
= dccp_v6_csum_finish(skb
,
295 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
296 err
= ip6_xmit(sk
, skb
, &fl
, opt
, 0);
297 err
= net_xmit_eval(err
);
301 if (opt
!= NULL
&& opt
!= np
->opt
)
302 sock_kfree_s(sk
, opt
, opt
->tot_len
);
307 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
309 dccp_feat_list_purge(&dccp_rsk(req
)->dreq_featneg
);
310 if (inet6_rsk(req
)->pktopts
!= NULL
)
311 kfree_skb(inet6_rsk(req
)->pktopts
);
314 static void dccp_v6_ctl_send_reset(struct sock
*sk
, struct sk_buff
*rxskb
)
316 struct ipv6hdr
*rxip6h
;
319 struct net
*net
= dev_net(skb_dst(rxskb
)->dev
);
320 struct sock
*ctl_sk
= net
->dccp
.v6_ctl_sk
;
321 struct dst_entry
*dst
;
323 if (dccp_hdr(rxskb
)->dccph_type
== DCCP_PKT_RESET
)
326 if (!ipv6_unicast_destination(rxskb
))
329 skb
= dccp_ctl_make_reset(ctl_sk
, rxskb
);
333 rxip6h
= ipv6_hdr(rxskb
);
334 dccp_hdr(skb
)->dccph_checksum
= dccp_v6_csum_finish(skb
, &rxip6h
->saddr
,
337 memset(&fl
, 0, sizeof(fl
));
338 ipv6_addr_copy(&fl
.fl6_dst
, &rxip6h
->saddr
);
339 ipv6_addr_copy(&fl
.fl6_src
, &rxip6h
->daddr
);
341 fl
.proto
= IPPROTO_DCCP
;
342 fl
.oif
= inet6_iif(rxskb
);
343 fl
.fl_ip_dport
= dccp_hdr(skb
)->dccph_dport
;
344 fl
.fl_ip_sport
= dccp_hdr(skb
)->dccph_sport
;
345 security_skb_classify_flow(rxskb
, &fl
);
347 /* sk = NULL, but it is safe for now. RST socket required. */
348 if (!ip6_dst_lookup(ctl_sk
, &dst
, &fl
)) {
349 if (xfrm_lookup(net
, &dst
, &fl
, NULL
, 0) >= 0) {
350 skb_dst_set(skb
, dst
);
351 ip6_xmit(ctl_sk
, skb
, &fl
, NULL
, 0);
352 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS
);
353 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS
);
361 static struct request_sock_ops dccp6_request_sock_ops
= {
363 .obj_size
= sizeof(struct dccp6_request_sock
),
364 .rtx_syn_ack
= dccp_v6_send_response
,
365 .send_ack
= dccp_reqsk_send_ack
,
366 .destructor
= dccp_v6_reqsk_destructor
,
367 .send_reset
= dccp_v6_ctl_send_reset
,
370 static struct sock
*dccp_v6_hnd_req(struct sock
*sk
,struct sk_buff
*skb
)
372 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
373 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
375 struct request_sock
**prev
;
376 /* Find possible connection requests. */
377 struct request_sock
*req
= inet6_csk_search_req(sk
, &prev
,
383 return dccp_check_req(sk
, skb
, req
, prev
);
385 nsk
= __inet6_lookup_established(sock_net(sk
), &dccp_hashinfo
,
386 &iph
->saddr
, dh
->dccph_sport
,
387 &iph
->daddr
, ntohs(dh
->dccph_dport
),
390 if (nsk
->sk_state
!= DCCP_TIME_WAIT
) {
394 inet_twsk_put(inet_twsk(nsk
));
401 static int dccp_v6_conn_request(struct sock
*sk
, struct sk_buff
*skb
)
403 struct request_sock
*req
;
404 struct dccp_request_sock
*dreq
;
405 struct inet6_request_sock
*ireq6
;
406 struct ipv6_pinfo
*np
= inet6_sk(sk
);
407 const __be32 service
= dccp_hdr_request(skb
)->dccph_req_service
;
408 struct dccp_skb_cb
*dcb
= DCCP_SKB_CB(skb
);
410 if (skb
->protocol
== htons(ETH_P_IP
))
411 return dccp_v4_conn_request(sk
, skb
);
413 if (!ipv6_unicast_destination(skb
))
414 return 0; /* discard, don't send a reset here */
416 if (dccp_bad_service_code(sk
, service
)) {
417 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_BAD_SERVICE_CODE
;
421 * There are no SYN attacks on IPv6, yet...
423 dcb
->dccpd_reset_code
= DCCP_RESET_CODE_TOO_BUSY
;
424 if (inet_csk_reqsk_queue_is_full(sk
))
427 if (sk_acceptq_is_full(sk
) && inet_csk_reqsk_queue_young(sk
) > 1)
430 req
= inet6_reqsk_alloc(&dccp6_request_sock_ops
);
434 if (dccp_reqsk_init(req
, dccp_sk(sk
), skb
))
437 dreq
= dccp_rsk(req
);
438 if (dccp_parse_options(sk
, dreq
, skb
))
441 if (security_inet_conn_request(sk
, skb
, req
))
444 ireq6
= inet6_rsk(req
);
445 ipv6_addr_copy(&ireq6
->rmt_addr
, &ipv6_hdr(skb
)->saddr
);
446 ipv6_addr_copy(&ireq6
->loc_addr
, &ipv6_hdr(skb
)->daddr
);
448 if (ipv6_opt_accepted(sk
, skb
) ||
449 np
->rxopt
.bits
.rxinfo
|| np
->rxopt
.bits
.rxoinfo
||
450 np
->rxopt
.bits
.rxhlim
|| np
->rxopt
.bits
.rxohlim
) {
451 atomic_inc(&skb
->users
);
452 ireq6
->pktopts
= skb
;
454 ireq6
->iif
= sk
->sk_bound_dev_if
;
456 /* So that link locals have meaning */
457 if (!sk
->sk_bound_dev_if
&&
458 ipv6_addr_type(&ireq6
->rmt_addr
) & IPV6_ADDR_LINKLOCAL
)
459 ireq6
->iif
= inet6_iif(skb
);
462 * Step 3: Process LISTEN state
464 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
466 * In fact we defer setting S.GSR, S.SWL, S.SWH to
467 * dccp_create_openreq_child.
469 dreq
->dreq_isr
= dcb
->dccpd_seq
;
470 dreq
->dreq_iss
= dccp_v6_init_sequence(skb
);
471 dreq
->dreq_service
= service
;
473 if (dccp_v6_send_response(sk
, req
, NULL
))
476 inet6_csk_reqsk_queue_hash_add(sk
, req
, DCCP_TIMEOUT_INIT
);
482 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
486 static struct sock
*dccp_v6_request_recv_sock(struct sock
*sk
,
488 struct request_sock
*req
,
489 struct dst_entry
*dst
)
491 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
492 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
493 struct inet_sock
*newinet
;
494 struct dccp_sock
*newdp
;
495 struct dccp6_sock
*newdp6
;
497 struct ipv6_txoptions
*opt
;
499 if (skb
->protocol
== htons(ETH_P_IP
)) {
503 newsk
= dccp_v4_request_recv_sock(sk
, skb
, req
, dst
);
507 newdp6
= (struct dccp6_sock
*)newsk
;
508 newdp
= dccp_sk(newsk
);
509 newinet
= inet_sk(newsk
);
510 newinet
->pinet6
= &newdp6
->inet6
;
511 newnp
= inet6_sk(newsk
);
513 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
515 ipv6_addr_set_v4mapped(newinet
->inet_daddr
, &newnp
->daddr
);
517 ipv6_addr_set_v4mapped(newinet
->inet_saddr
, &newnp
->saddr
);
519 ipv6_addr_copy(&newnp
->rcv_saddr
, &newnp
->saddr
);
521 inet_csk(newsk
)->icsk_af_ops
= &dccp_ipv6_mapped
;
522 newsk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
523 newnp
->pktoptions
= NULL
;
525 newnp
->mcast_oif
= inet6_iif(skb
);
526 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
529 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
530 * here, dccp_create_openreq_child now does this for us, see the comment in
531 * that function for the gory details. -acme
534 /* It is tricky place. Until this moment IPv4 tcp
535 worked with IPv6 icsk.icsk_af_ops.
538 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
545 if (sk_acceptq_is_full(sk
))
549 struct in6_addr
*final_p
= NULL
, final
;
552 memset(&fl
, 0, sizeof(fl
));
553 fl
.proto
= IPPROTO_DCCP
;
554 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
555 if (opt
!= NULL
&& opt
->srcrt
!= NULL
) {
556 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)opt
->srcrt
;
558 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
559 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
562 ipv6_addr_copy(&fl
.fl6_src
, &ireq6
->loc_addr
);
563 fl
.oif
= sk
->sk_bound_dev_if
;
564 fl
.fl_ip_dport
= inet_rsk(req
)->rmt_port
;
565 fl
.fl_ip_sport
= inet_rsk(req
)->loc_port
;
566 security_sk_classify_flow(sk
, &fl
);
568 if (ip6_dst_lookup(sk
, &dst
, &fl
))
572 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
574 if ((xfrm_lookup(sock_net(sk
), &dst
, &fl
, sk
, 0)) < 0)
578 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
583 * No need to charge this sock to the relevant IPv6 refcnt debug socks
584 * count here, dccp_create_openreq_child now does this for us, see the
585 * comment in that function for the gory details. -acme
588 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
589 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
591 newdp6
= (struct dccp6_sock
*)newsk
;
592 newinet
= inet_sk(newsk
);
593 newinet
->pinet6
= &newdp6
->inet6
;
594 newdp
= dccp_sk(newsk
);
595 newnp
= inet6_sk(newsk
);
597 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
599 ipv6_addr_copy(&newnp
->daddr
, &ireq6
->rmt_addr
);
600 ipv6_addr_copy(&newnp
->saddr
, &ireq6
->loc_addr
);
601 ipv6_addr_copy(&newnp
->rcv_saddr
, &ireq6
->loc_addr
);
602 newsk
->sk_bound_dev_if
= ireq6
->iif
;
604 /* Now IPv6 options...
606 First: no IPv4 options.
611 newnp
->rxopt
.all
= np
->rxopt
.all
;
613 /* Clone pktoptions received with SYN */
614 newnp
->pktoptions
= NULL
;
615 if (ireq6
->pktopts
!= NULL
) {
616 newnp
->pktoptions
= skb_clone(ireq6
->pktopts
, GFP_ATOMIC
);
617 kfree_skb(ireq6
->pktopts
);
618 ireq6
->pktopts
= NULL
;
619 if (newnp
->pktoptions
)
620 skb_set_owner_r(newnp
->pktoptions
, newsk
);
623 newnp
->mcast_oif
= inet6_iif(skb
);
624 newnp
->mcast_hops
= ipv6_hdr(skb
)->hop_limit
;
627 * Clone native IPv6 options from listening socket (if any)
629 * Yes, keeping reference count would be much more clever, but we make
630 * one more one thing there: reattach optmem to newsk.
633 newnp
->opt
= ipv6_dup_options(newsk
, opt
);
635 sock_kfree_s(sk
, opt
, opt
->tot_len
);
638 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
639 if (newnp
->opt
!= NULL
)
640 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
641 newnp
->opt
->opt_flen
);
643 dccp_sync_mss(newsk
, dst_mtu(dst
));
645 newinet
->inet_daddr
= newinet
->inet_saddr
= LOOPBACK4_IPV6
;
646 newinet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
648 __inet6_hash(newsk
, NULL
);
649 __inet_inherit_port(sk
, newsk
);
654 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENOVERFLOWS
);
656 NET_INC_STATS_BH(sock_net(sk
), LINUX_MIB_LISTENDROPS
);
657 if (opt
!= NULL
&& opt
!= np
->opt
)
658 sock_kfree_s(sk
, opt
, opt
->tot_len
);
663 /* The socket must have it's spinlock held when we get
666 * We have a potential double-lock case here, so even when
667 * doing backlog processing we use the BH locking scheme.
668 * This is because we cannot sleep with the original spinlock
671 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
673 struct ipv6_pinfo
*np
= inet6_sk(sk
);
674 struct sk_buff
*opt_skb
= NULL
;
676 /* Imagine: socket is IPv6. IPv4 packet arrives,
677 goes to IPv4 receive handler and backlogged.
678 From backlog it always goes here. Kerboom...
679 Fortunately, dccp_rcv_established and rcv_established
680 handle them correctly, but it is not case with
681 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
684 if (skb
->protocol
== htons(ETH_P_IP
))
685 return dccp_v4_do_rcv(sk
, skb
);
687 if (sk_filter(sk
, skb
))
691 * socket locking is here for SMP purposes as backlog rcv is currently
692 * called with bh processing disabled.
695 /* Do Stevens' IPV6_PKTOPTIONS.
697 Yes, guys, it is the only place in our code, where we
698 may make it not affecting IPv4.
699 The rest of code is protocol independent,
700 and I do not like idea to uglify IPv4.
702 Actually, all the idea behind IPV6_PKTOPTIONS
703 looks not very well thought. For now we latch
704 options, received in the last packet, enqueued
705 by tcp. Feel free to propose better solution.
710 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
711 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
713 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
715 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
716 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
719 /* XXX This is where we would goto ipv6_pktoptions. */
720 __kfree_skb(opt_skb
);
726 * Step 3: Process LISTEN state
727 * If S.state == LISTEN,
728 * If P.type == Request or P contains a valid Init Cookie option,
729 * (* Must scan the packet's options to check for Init
730 * Cookies. Only Init Cookies are processed here,
731 * however; other options are processed in Step 8. This
732 * scan need only be performed if the endpoint uses Init
734 * (* Generate a new socket and switch to that socket *)
735 * Set S := new socket for this port pair
737 * Choose S.ISS (initial seqno) or set from Init Cookies
738 * Initialize S.GAR := S.ISS
739 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
740 * Continue with S.state == RESPOND
741 * (* A Response packet will be generated in Step 11 *)
743 * Generate Reset(No Connection) unless P.type == Reset
744 * Drop packet and return
746 * NOTE: the check for the packet types is done in
747 * dccp_rcv_state_process
749 if (sk
->sk_state
== DCCP_LISTEN
) {
750 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
755 * Queue it on the new socket if the new socket is active,
756 * otherwise we just shortcircuit this and continue with
760 if (dccp_child_process(sk
, nsk
, skb
))
763 __kfree_skb(opt_skb
);
768 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
771 /* XXX This is where we would goto ipv6_pktoptions. */
772 __kfree_skb(opt_skb
);
777 dccp_v6_ctl_send_reset(sk
, skb
);
780 __kfree_skb(opt_skb
);
785 static int dccp_v6_rcv(struct sk_buff
*skb
)
787 const struct dccp_hdr
*dh
;
791 /* Step 1: Check header basics */
793 if (dccp_invalid_packet(skb
))
796 /* Step 1: If header checksum is incorrect, drop packet and return. */
797 if (dccp_v6_csum_finish(skb
, &ipv6_hdr(skb
)->saddr
,
798 &ipv6_hdr(skb
)->daddr
)) {
799 DCCP_WARN("dropped packet with invalid checksum\n");
805 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(dh
);
806 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
808 if (dccp_packet_without_ack(skb
))
809 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
811 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
814 * Look up flow ID in table and get corresponding socket */
815 sk
= __inet6_lookup_skb(&dccp_hashinfo
, skb
,
816 dh
->dccph_sport
, dh
->dccph_dport
);
822 dccp_pr_debug("failed to look up flow ID in table and "
823 "get corresponding socket\n");
829 * ... or S.state == TIMEWAIT,
830 * Generate Reset(No Connection) unless P.type == Reset
831 * Drop packet and return
833 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
834 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
835 inet_twsk_put(inet_twsk(sk
));
840 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
841 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
842 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
844 min_cov
= dccp_sk(sk
)->dccps_pcrlen
;
845 if (dh
->dccph_cscov
&& (min_cov
== 0 || dh
->dccph_cscov
< min_cov
)) {
846 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
847 dh
->dccph_cscov
, min_cov
);
848 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
849 goto discard_and_relse
;
852 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
853 goto discard_and_relse
;
855 return sk_receive_skb(sk
, skb
, 1) ? -1 : 0;
858 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
863 * Generate Reset(No Connection) unless P.type == Reset
864 * Drop packet and return
866 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
867 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
868 DCCP_RESET_CODE_NO_CONNECTION
;
869 dccp_v6_ctl_send_reset(sk
, skb
);
881 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
884 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
885 struct inet_connection_sock
*icsk
= inet_csk(sk
);
886 struct inet_sock
*inet
= inet_sk(sk
);
887 struct ipv6_pinfo
*np
= inet6_sk(sk
);
888 struct dccp_sock
*dp
= dccp_sk(sk
);
889 struct in6_addr
*saddr
= NULL
, *final_p
= NULL
, final
;
891 struct dst_entry
*dst
;
895 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
897 if (addr_len
< SIN6_LEN_RFC2133
)
900 if (usin
->sin6_family
!= AF_INET6
)
901 return -EAFNOSUPPORT
;
903 memset(&fl
, 0, sizeof(fl
));
906 fl
.fl6_flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
907 IP6_ECN_flow_init(fl
.fl6_flowlabel
);
908 if (fl
.fl6_flowlabel
& IPV6_FLOWLABEL_MASK
) {
909 struct ip6_flowlabel
*flowlabel
;
910 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
911 if (flowlabel
== NULL
)
913 ipv6_addr_copy(&usin
->sin6_addr
, &flowlabel
->dst
);
914 fl6_sock_release(flowlabel
);
918 * connect() to INADDR_ANY means loopback (BSD'ism).
920 if (ipv6_addr_any(&usin
->sin6_addr
))
921 usin
->sin6_addr
.s6_addr
[15] = 1;
923 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
925 if (addr_type
& IPV6_ADDR_MULTICAST
)
928 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
929 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
930 usin
->sin6_scope_id
) {
931 /* If interface is set while binding, indices
934 if (sk
->sk_bound_dev_if
&&
935 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
938 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
941 /* Connect to link-local address requires an interface */
942 if (!sk
->sk_bound_dev_if
)
946 ipv6_addr_copy(&np
->daddr
, &usin
->sin6_addr
);
947 np
->flow_label
= fl
.fl6_flowlabel
;
952 if (addr_type
== IPV6_ADDR_MAPPED
) {
953 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
954 struct sockaddr_in sin
;
956 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
958 if (__ipv6_only_sock(sk
))
961 sin
.sin_family
= AF_INET
;
962 sin
.sin_port
= usin
->sin6_port
;
963 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
965 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
966 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
968 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
970 icsk
->icsk_ext_hdr_len
= exthdrlen
;
971 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
972 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
975 ipv6_addr_set_v4mapped(inet
->inet_saddr
, &np
->saddr
);
976 ipv6_addr_set_v4mapped(inet
->inet_rcv_saddr
, &np
->rcv_saddr
);
981 if (!ipv6_addr_any(&np
->rcv_saddr
))
982 saddr
= &np
->rcv_saddr
;
984 fl
.proto
= IPPROTO_DCCP
;
985 ipv6_addr_copy(&fl
.fl6_dst
, &np
->daddr
);
986 ipv6_addr_copy(&fl
.fl6_src
, saddr
? saddr
: &np
->saddr
);
987 fl
.oif
= sk
->sk_bound_dev_if
;
988 fl
.fl_ip_dport
= usin
->sin6_port
;
989 fl
.fl_ip_sport
= inet
->inet_sport
;
990 security_sk_classify_flow(sk
, &fl
);
992 if (np
->opt
!= NULL
&& np
->opt
->srcrt
!= NULL
) {
993 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)np
->opt
->srcrt
;
995 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
996 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
1000 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
1005 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
1007 err
= __xfrm_lookup(sock_net(sk
), &dst
, &fl
, sk
, XFRM_LOOKUP_WAIT
);
1009 if (err
== -EREMOTE
)
1010 err
= ip6_dst_blackhole(sk
, &dst
, &fl
);
1015 if (saddr
== NULL
) {
1016 saddr
= &fl
.fl6_src
;
1017 ipv6_addr_copy(&np
->rcv_saddr
, saddr
);
1020 /* set the source address */
1021 ipv6_addr_copy(&np
->saddr
, saddr
);
1022 inet
->inet_rcv_saddr
= LOOPBACK4_IPV6
;
1024 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
1026 icsk
->icsk_ext_hdr_len
= 0;
1027 if (np
->opt
!= NULL
)
1028 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
1029 np
->opt
->opt_nflen
);
1031 inet
->inet_dport
= usin
->sin6_port
;
1033 dccp_set_state(sk
, DCCP_REQUESTING
);
1034 err
= inet6_hash_connect(&dccp_death_row
, sk
);
1038 dp
->dccps_iss
= secure_dccpv6_sequence_number(np
->saddr
.s6_addr32
,
1039 np
->daddr
.s6_addr32
,
1042 err
= dccp_connect(sk
);
1049 dccp_set_state(sk
, DCCP_CLOSED
);
1052 inet
->inet_dport
= 0;
1053 sk
->sk_route_caps
= 0;
1057 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
1058 .queue_xmit
= inet6_csk_xmit
,
1059 .send_check
= dccp_v6_send_check
,
1060 .rebuild_header
= inet6_sk_rebuild_header
,
1061 .conn_request
= dccp_v6_conn_request
,
1062 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1063 .net_header_len
= sizeof(struct ipv6hdr
),
1064 .setsockopt
= ipv6_setsockopt
,
1065 .getsockopt
= ipv6_getsockopt
,
1066 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1067 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1068 .bind_conflict
= inet6_csk_bind_conflict
,
1069 #ifdef CONFIG_COMPAT
1070 .compat_setsockopt
= compat_ipv6_setsockopt
,
1071 .compat_getsockopt
= compat_ipv6_getsockopt
,
1076 * DCCP over IPv4 via INET6 API
1078 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
1079 .queue_xmit
= ip_queue_xmit
,
1080 .send_check
= dccp_v4_send_check
,
1081 .rebuild_header
= inet_sk_rebuild_header
,
1082 .conn_request
= dccp_v6_conn_request
,
1083 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1084 .net_header_len
= sizeof(struct iphdr
),
1085 .setsockopt
= ipv6_setsockopt
,
1086 .getsockopt
= ipv6_getsockopt
,
1087 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1088 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1089 #ifdef CONFIG_COMPAT
1090 .compat_setsockopt
= compat_ipv6_setsockopt
,
1091 .compat_getsockopt
= compat_ipv6_getsockopt
,
1095 /* NOTE: A lot of things set to zero explicitly by call to
1096 * sk_alloc() so need not be done here.
1098 static int dccp_v6_init_sock(struct sock
*sk
)
1100 static __u8 dccp_v6_ctl_sock_initialized
;
1101 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
1104 if (unlikely(!dccp_v6_ctl_sock_initialized
))
1105 dccp_v6_ctl_sock_initialized
= 1;
1106 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
1112 static void dccp_v6_destroy_sock(struct sock
*sk
)
1114 dccp_destroy_sock(sk
);
1115 inet6_destroy_sock(sk
);
1118 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1119 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1122 static struct proto dccp_v6_prot
= {
1124 .owner
= THIS_MODULE
,
1125 .close
= dccp_close
,
1126 .connect
= dccp_v6_connect
,
1127 .disconnect
= dccp_disconnect
,
1128 .ioctl
= dccp_ioctl
,
1129 .init
= dccp_v6_init_sock
,
1130 .setsockopt
= dccp_setsockopt
,
1131 .getsockopt
= dccp_getsockopt
,
1132 .sendmsg
= dccp_sendmsg
,
1133 .recvmsg
= dccp_recvmsg
,
1134 .backlog_rcv
= dccp_v6_do_rcv
,
1135 .hash
= dccp_v6_hash
,
1136 .unhash
= inet_unhash
,
1137 .accept
= inet_csk_accept
,
1138 .get_port
= inet_csk_get_port
,
1139 .shutdown
= dccp_shutdown
,
1140 .destroy
= dccp_v6_destroy_sock
,
1141 .orphan_count
= &dccp_orphan_count
,
1142 .max_header
= MAX_DCCP_HEADER
,
1143 .obj_size
= sizeof(struct dccp6_sock
),
1144 .slab_flags
= SLAB_DESTROY_BY_RCU
,
1145 .rsk_prot
= &dccp6_request_sock_ops
,
1146 .twsk_prot
= &dccp6_timewait_sock_ops
,
1147 .h
.hashinfo
= &dccp_hashinfo
,
1148 #ifdef CONFIG_COMPAT
1149 .compat_setsockopt
= compat_dccp_setsockopt
,
1150 .compat_getsockopt
= compat_dccp_getsockopt
,
1154 static const struct inet6_protocol dccp_v6_protocol
= {
1155 .handler
= dccp_v6_rcv
,
1156 .err_handler
= dccp_v6_err
,
1157 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1160 static const struct proto_ops inet6_dccp_ops
= {
1162 .owner
= THIS_MODULE
,
1163 .release
= inet6_release
,
1165 .connect
= inet_stream_connect
,
1166 .socketpair
= sock_no_socketpair
,
1167 .accept
= inet_accept
,
1168 .getname
= inet6_getname
,
1170 .ioctl
= inet6_ioctl
,
1171 .listen
= inet_dccp_listen
,
1172 .shutdown
= inet_shutdown
,
1173 .setsockopt
= sock_common_setsockopt
,
1174 .getsockopt
= sock_common_getsockopt
,
1175 .sendmsg
= inet_sendmsg
,
1176 .recvmsg
= sock_common_recvmsg
,
1177 .mmap
= sock_no_mmap
,
1178 .sendpage
= sock_no_sendpage
,
1179 #ifdef CONFIG_COMPAT
1180 .compat_setsockopt
= compat_sock_common_setsockopt
,
1181 .compat_getsockopt
= compat_sock_common_getsockopt
,
1185 static struct inet_protosw dccp_v6_protosw
= {
1187 .protocol
= IPPROTO_DCCP
,
1188 .prot
= &dccp_v6_prot
,
1189 .ops
= &inet6_dccp_ops
,
1190 .flags
= INET_PROTOSW_ICSK
,
1193 static int __net_init
dccp_v6_init_net(struct net
*net
)
1195 if (dccp_hashinfo
.bhash
== NULL
)
1196 return -ESOCKTNOSUPPORT
;
1198 return inet_ctl_sock_create(&net
->dccp
.v6_ctl_sk
, PF_INET6
,
1199 SOCK_DCCP
, IPPROTO_DCCP
, net
);
1202 static void __net_exit
dccp_v6_exit_net(struct net
*net
)
1204 inet_ctl_sock_destroy(net
->dccp
.v6_ctl_sk
);
1207 static struct pernet_operations dccp_v6_ops
= {
1208 .init
= dccp_v6_init_net
,
1209 .exit
= dccp_v6_exit_net
,
1212 static int __init
dccp_v6_init(void)
1214 int err
= proto_register(&dccp_v6_prot
, 1);
1219 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1221 goto out_unregister_proto
;
1223 inet6_register_protosw(&dccp_v6_protosw
);
1225 err
= register_pernet_subsys(&dccp_v6_ops
);
1227 goto out_destroy_ctl_sock
;
1231 out_destroy_ctl_sock
:
1232 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1233 inet6_unregister_protosw(&dccp_v6_protosw
);
1234 out_unregister_proto
:
1235 proto_unregister(&dccp_v6_prot
);
1239 static void __exit
dccp_v6_exit(void)
1241 unregister_pernet_subsys(&dccp_v6_ops
);
1242 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1243 inet6_unregister_protosw(&dccp_v6_protosw
);
1244 proto_unregister(&dccp_v6_prot
);
1247 module_init(dccp_v6_init
);
1248 module_exit(dccp_v6_exit
);
1251 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1252 * values directly, Also cover the case where the protocol is not specified,
1253 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1255 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 33, 6);
1256 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6
, 0, 6);
1257 MODULE_LICENSE("GPL");
1258 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1259 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");