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 int dccp_v6_get_port(struct sock
*sk
, unsigned short snum
)
44 return inet_csk_get_port(&dccp_hashinfo
, sk
, snum
,
45 inet6_csk_bind_conflict
);
48 static void dccp_v6_hash(struct sock
*sk
)
50 if (sk
->sk_state
!= DCCP_CLOSED
) {
51 if (inet_csk(sk
)->icsk_af_ops
== &dccp_ipv6_mapped
) {
56 __inet6_hash(&dccp_hashinfo
, sk
);
61 static inline u16
dccp_v6_check(struct dccp_hdr
*dh
, int len
,
62 struct in6_addr
*saddr
,
63 struct in6_addr
*daddr
,
66 return csum_ipv6_magic(saddr
, daddr
, len
, IPPROTO_DCCP
, base
);
69 static __u32
dccp_v6_init_sequence(struct sock
*sk
, struct sk_buff
*skb
)
71 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
73 if (skb
->protocol
== htons(ETH_P_IPV6
))
74 return secure_tcpv6_sequence_number(skb
->nh
.ipv6h
->daddr
.s6_addr32
,
75 skb
->nh
.ipv6h
->saddr
.s6_addr32
,
79 return secure_dccp_sequence_number(skb
->nh
.iph
->daddr
,
85 static void dccp_v6_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
86 int type
, int code
, int offset
, __be32 info
)
88 struct ipv6hdr
*hdr
= (struct ipv6hdr
*)skb
->data
;
89 const struct dccp_hdr
*dh
= (struct dccp_hdr
*)(skb
->data
+ offset
);
90 struct ipv6_pinfo
*np
;
95 sk
= inet6_lookup(&dccp_hashinfo
, &hdr
->daddr
, dh
->dccph_dport
,
96 &hdr
->saddr
, dh
->dccph_sport
, inet6_iif(skb
));
99 ICMP6_INC_STATS_BH(__in6_dev_get(skb
->dev
), ICMP6_MIB_INERRORS
);
103 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
104 inet_twsk_put(inet_twsk(sk
));
109 if (sock_owned_by_user(sk
))
110 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS
);
112 if (sk
->sk_state
== DCCP_CLOSED
)
117 if (type
== ICMPV6_PKT_TOOBIG
) {
118 struct dst_entry
*dst
= NULL
;
120 if (sock_owned_by_user(sk
))
122 if ((1 << sk
->sk_state
) & (DCCPF_LISTEN
| DCCPF_CLOSED
))
125 /* icmp should have updated the destination cache entry */
126 dst
= __sk_dst_check(sk
, np
->dst_cookie
);
128 struct inet_sock
*inet
= inet_sk(sk
);
131 /* BUGGG_FUTURE: Again, it is not clear how
132 to handle rthdr case. Ignore this complexity
135 memset(&fl
, 0, sizeof(fl
));
136 fl
.proto
= IPPROTO_DCCP
;
137 ipv6_addr_copy(&fl
.fl6_dst
, &np
->daddr
);
138 ipv6_addr_copy(&fl
.fl6_src
, &np
->saddr
);
139 fl
.oif
= sk
->sk_bound_dev_if
;
140 fl
.fl_ip_dport
= inet
->dport
;
141 fl
.fl_ip_sport
= inet
->sport
;
142 security_sk_classify_flow(sk
, &fl
);
144 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
146 sk
->sk_err_soft
= -err
;
150 err
= xfrm_lookup(&dst
, &fl
, sk
, 0);
152 sk
->sk_err_soft
= -err
;
158 if (inet_csk(sk
)->icsk_pmtu_cookie
> dst_mtu(dst
)) {
159 dccp_sync_mss(sk
, dst_mtu(dst
));
160 } /* else let the usual retransmit timer handle it */
165 icmpv6_err_convert(type
, code
, &err
);
167 seq
= DCCP_SKB_CB(skb
)->dccpd_seq
;
168 /* Might be for an request_sock */
169 switch (sk
->sk_state
) {
170 struct request_sock
*req
, **prev
;
172 if (sock_owned_by_user(sk
))
175 req
= inet6_csk_search_req(sk
, &prev
, dh
->dccph_dport
,
176 &hdr
->daddr
, &hdr
->saddr
,
182 * ICMPs are not backlogged, hence we cannot get an established
185 BUG_TRAP(req
->sk
== NULL
);
187 if (seq
!= dccp_rsk(req
)->dreq_iss
) {
188 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS
);
192 inet_csk_reqsk_queue_drop(sk
, req
, prev
);
195 case DCCP_REQUESTING
:
196 case DCCP_RESPOND
: /* Cannot happen.
197 It can, it SYNs are crossed. --ANK */
198 if (!sock_owned_by_user(sk
)) {
199 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
202 * Wake people up to see the error
203 * (see connect in sock.c)
205 sk
->sk_error_report(sk
);
208 sk
->sk_err_soft
= err
;
212 if (!sock_owned_by_user(sk
) && np
->recverr
) {
214 sk
->sk_error_report(sk
);
216 sk
->sk_err_soft
= err
;
224 static int dccp_v6_send_response(struct sock
*sk
, struct request_sock
*req
,
225 struct dst_entry
*dst
)
227 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
228 struct ipv6_pinfo
*np
= inet6_sk(sk
);
230 struct ipv6_txoptions
*opt
= NULL
;
231 struct in6_addr
*final_p
= NULL
, final
;
235 memset(&fl
, 0, sizeof(fl
));
236 fl
.proto
= IPPROTO_DCCP
;
237 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
238 ipv6_addr_copy(&fl
.fl6_src
, &ireq6
->loc_addr
);
239 fl
.fl6_flowlabel
= 0;
241 fl
.fl_ip_dport
= inet_rsk(req
)->rmt_port
;
242 fl
.fl_ip_sport
= inet_sk(sk
)->sport
;
243 security_req_classify_flow(req
, &fl
);
248 np
->rxopt
.bits
.osrcrt
== 2 &&
250 struct sk_buff
*pktopts
= ireq6
->pktopts
;
251 struct inet6_skb_parm
*rxopt
= IP6CB(pktopts
);
254 opt
= ipv6_invert_rthdr(sk
,
255 (struct ipv6_rt_hdr
*)(pktopts
->nh
.raw
+
259 if (opt
!= NULL
&& opt
->srcrt
!= NULL
) {
260 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)opt
->srcrt
;
262 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
263 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
267 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
272 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
274 err
= xfrm_lookup(&dst
, &fl
, sk
, 0);
279 skb
= dccp_make_response(sk
, dst
, req
);
281 struct dccp_hdr
*dh
= dccp_hdr(skb
);
283 dh
->dccph_checksum
= dccp_v6_check(dh
, skb
->len
,
286 csum_partial((char *)dh
,
289 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
290 err
= ip6_xmit(sk
, skb
, &fl
, opt
, 0);
291 if (err
== NET_XMIT_CN
)
296 if (opt
!= NULL
&& opt
!= np
->opt
)
297 sock_kfree_s(sk
, opt
, opt
->tot_len
);
302 static void dccp_v6_reqsk_destructor(struct request_sock
*req
)
304 if (inet6_rsk(req
)->pktopts
!= NULL
)
305 kfree_skb(inet6_rsk(req
)->pktopts
);
308 static void dccp_v6_send_check(struct sock
*sk
, int len
, struct sk_buff
*skb
)
310 struct ipv6_pinfo
*np
= inet6_sk(sk
);
311 struct dccp_hdr
*dh
= dccp_hdr(skb
);
313 dh
->dccph_checksum
= csum_ipv6_magic(&np
->saddr
, &np
->daddr
,
315 csum_partial((char *)dh
,
320 static void dccp_v6_ctl_send_reset(struct sk_buff
*rxskb
)
322 struct dccp_hdr
*rxdh
= dccp_hdr(rxskb
), *dh
;
323 const u32 dccp_hdr_reset_len
= sizeof(struct dccp_hdr
) +
324 sizeof(struct dccp_hdr_ext
) +
325 sizeof(struct dccp_hdr_reset
);
330 if (rxdh
->dccph_type
== DCCP_PKT_RESET
)
333 if (!ipv6_unicast_destination(rxskb
))
336 skb
= alloc_skb(dccp_v6_ctl_socket
->sk
->sk_prot
->max_header
,
341 skb_reserve(skb
, dccp_v6_ctl_socket
->sk
->sk_prot
->max_header
);
343 dh
= dccp_zeroed_hdr(skb
, dccp_hdr_reset_len
);
345 /* Swap the send and the receive. */
346 dh
->dccph_type
= DCCP_PKT_RESET
;
347 dh
->dccph_sport
= rxdh
->dccph_dport
;
348 dh
->dccph_dport
= rxdh
->dccph_sport
;
349 dh
->dccph_doff
= dccp_hdr_reset_len
/ 4;
351 dccp_hdr_reset(skb
)->dccph_reset_code
=
352 DCCP_SKB_CB(rxskb
)->dccpd_reset_code
;
354 /* See "8.3.1. Abnormal Termination" in RFC 4340 */
356 if (DCCP_SKB_CB(rxskb
)->dccpd_ack_seq
!= DCCP_PKT_WITHOUT_ACK_SEQ
)
357 dccp_set_seqno(&seqno
, DCCP_SKB_CB(rxskb
)->dccpd_ack_seq
+ 1);
359 dccp_hdr_set_seq(dh
, seqno
);
360 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb
),
361 DCCP_SKB_CB(rxskb
)->dccpd_seq
);
363 memset(&fl
, 0, sizeof(fl
));
364 ipv6_addr_copy(&fl
.fl6_dst
, &rxskb
->nh
.ipv6h
->saddr
);
365 ipv6_addr_copy(&fl
.fl6_src
, &rxskb
->nh
.ipv6h
->daddr
);
366 dh
->dccph_checksum
= csum_ipv6_magic(&fl
.fl6_src
, &fl
.fl6_dst
,
367 sizeof(*dh
), IPPROTO_DCCP
,
369 fl
.proto
= IPPROTO_DCCP
;
370 fl
.oif
= inet6_iif(rxskb
);
371 fl
.fl_ip_dport
= dh
->dccph_dport
;
372 fl
.fl_ip_sport
= dh
->dccph_sport
;
373 security_skb_classify_flow(rxskb
, &fl
);
375 /* sk = NULL, but it is safe for now. RST socket required. */
376 if (!ip6_dst_lookup(NULL
, &skb
->dst
, &fl
)) {
377 if (xfrm_lookup(&skb
->dst
, &fl
, NULL
, 0) >= 0) {
378 ip6_xmit(dccp_v6_ctl_socket
->sk
, skb
, &fl
, NULL
, 0);
379 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS
);
380 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS
);
388 static struct request_sock_ops dccp6_request_sock_ops
= {
390 .obj_size
= sizeof(struct dccp6_request_sock
),
391 .rtx_syn_ack
= dccp_v6_send_response
,
392 .send_ack
= dccp_reqsk_send_ack
,
393 .destructor
= dccp_v6_reqsk_destructor
,
394 .send_reset
= dccp_v6_ctl_send_reset
,
397 static struct sock
*dccp_v6_hnd_req(struct sock
*sk
,struct sk_buff
*skb
)
399 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
400 const struct ipv6hdr
*iph
= skb
->nh
.ipv6h
;
402 struct request_sock
**prev
;
403 /* Find possible connection requests. */
404 struct request_sock
*req
= inet6_csk_search_req(sk
, &prev
,
410 return dccp_check_req(sk
, skb
, req
, prev
);
412 nsk
= __inet6_lookup_established(&dccp_hashinfo
,
413 &iph
->saddr
, dh
->dccph_sport
,
414 &iph
->daddr
, ntohs(dh
->dccph_dport
),
417 if (nsk
->sk_state
!= DCCP_TIME_WAIT
) {
421 inet_twsk_put(inet_twsk(nsk
));
428 static int dccp_v6_conn_request(struct sock
*sk
, struct sk_buff
*skb
)
431 struct request_sock
*req
;
432 struct dccp_request_sock
*dreq
;
433 struct inet6_request_sock
*ireq6
;
434 struct ipv6_pinfo
*np
= inet6_sk(sk
);
435 const __be32 service
= dccp_hdr_request(skb
)->dccph_req_service
;
436 struct dccp_skb_cb
*dcb
= DCCP_SKB_CB(skb
);
437 __u8 reset_code
= DCCP_RESET_CODE_TOO_BUSY
;
439 if (skb
->protocol
== htons(ETH_P_IP
))
440 return dccp_v4_conn_request(sk
, skb
);
442 if (!ipv6_unicast_destination(skb
))
445 if (dccp_bad_service_code(sk
, service
)) {
446 reset_code
= DCCP_RESET_CODE_BAD_SERVICE_CODE
;
450 * There are no SYN attacks on IPv6, yet...
452 if (inet_csk_reqsk_queue_is_full(sk
))
455 if (sk_acceptq_is_full(sk
) && inet_csk_reqsk_queue_young(sk
) > 1)
458 req
= inet6_reqsk_alloc(&dccp6_request_sock_ops
);
462 /* FIXME: process options */
464 dccp_openreq_init(req
, &dp
, skb
);
466 if (security_inet_conn_request(sk
, skb
, req
))
469 ireq6
= inet6_rsk(req
);
470 ipv6_addr_copy(&ireq6
->rmt_addr
, &skb
->nh
.ipv6h
->saddr
);
471 ipv6_addr_copy(&ireq6
->loc_addr
, &skb
->nh
.ipv6h
->daddr
);
472 req
->rcv_wnd
= dccp_feat_default_sequence_window
;
473 ireq6
->pktopts
= NULL
;
475 if (ipv6_opt_accepted(sk
, skb
) ||
476 np
->rxopt
.bits
.rxinfo
|| np
->rxopt
.bits
.rxoinfo
||
477 np
->rxopt
.bits
.rxhlim
|| np
->rxopt
.bits
.rxohlim
) {
478 atomic_inc(&skb
->users
);
479 ireq6
->pktopts
= skb
;
481 ireq6
->iif
= sk
->sk_bound_dev_if
;
483 /* So that link locals have meaning */
484 if (!sk
->sk_bound_dev_if
&&
485 ipv6_addr_type(&ireq6
->rmt_addr
) & IPV6_ADDR_LINKLOCAL
)
486 ireq6
->iif
= inet6_iif(skb
);
489 * Step 3: Process LISTEN state
491 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
493 * In fact we defer setting S.GSR, S.SWL, S.SWH to
494 * dccp_create_openreq_child.
496 dreq
= dccp_rsk(req
);
497 dreq
->dreq_isr
= dcb
->dccpd_seq
;
498 dreq
->dreq_iss
= dccp_v6_init_sequence(sk
, skb
);
499 dreq
->dreq_service
= service
;
501 if (dccp_v6_send_response(sk
, req
, NULL
))
504 inet6_csk_reqsk_queue_hash_add(sk
, req
, DCCP_TIMEOUT_INIT
);
510 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS
);
511 dcb
->dccpd_reset_code
= reset_code
;
515 static struct sock
*dccp_v6_request_recv_sock(struct sock
*sk
,
517 struct request_sock
*req
,
518 struct dst_entry
*dst
)
520 struct inet6_request_sock
*ireq6
= inet6_rsk(req
);
521 struct ipv6_pinfo
*newnp
, *np
= inet6_sk(sk
);
522 struct inet_sock
*newinet
;
523 struct dccp_sock
*newdp
;
524 struct dccp6_sock
*newdp6
;
526 struct ipv6_txoptions
*opt
;
528 if (skb
->protocol
== htons(ETH_P_IP
)) {
532 newsk
= dccp_v4_request_recv_sock(sk
, skb
, req
, dst
);
536 newdp6
= (struct dccp6_sock
*)newsk
;
537 newdp
= dccp_sk(newsk
);
538 newinet
= inet_sk(newsk
);
539 newinet
->pinet6
= &newdp6
->inet6
;
540 newnp
= inet6_sk(newsk
);
542 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
544 ipv6_addr_set(&newnp
->daddr
, 0, 0, htonl(0x0000FFFF),
547 ipv6_addr_set(&newnp
->saddr
, 0, 0, htonl(0x0000FFFF),
550 ipv6_addr_copy(&newnp
->rcv_saddr
, &newnp
->saddr
);
552 inet_csk(newsk
)->icsk_af_ops
= &dccp_ipv6_mapped
;
553 newsk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
554 newnp
->pktoptions
= NULL
;
556 newnp
->mcast_oif
= inet6_iif(skb
);
557 newnp
->mcast_hops
= skb
->nh
.ipv6h
->hop_limit
;
560 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
561 * here, dccp_create_openreq_child now does this for us, see the comment in
562 * that function for the gory details. -acme
565 /* It is tricky place. Until this moment IPv4 tcp
566 worked with IPv6 icsk.icsk_af_ops.
569 dccp_sync_mss(newsk
, inet_csk(newsk
)->icsk_pmtu_cookie
);
576 if (sk_acceptq_is_full(sk
))
579 if (np
->rxopt
.bits
.osrcrt
== 2 && opt
== NULL
&& ireq6
->pktopts
) {
580 const struct inet6_skb_parm
*rxopt
= IP6CB(ireq6
->pktopts
);
583 opt
= ipv6_invert_rthdr(sk
,
584 (struct ipv6_rt_hdr
*)(ireq6
->pktopts
->nh
.raw
+
589 struct in6_addr
*final_p
= NULL
, final
;
592 memset(&fl
, 0, sizeof(fl
));
593 fl
.proto
= IPPROTO_DCCP
;
594 ipv6_addr_copy(&fl
.fl6_dst
, &ireq6
->rmt_addr
);
595 if (opt
!= NULL
&& opt
->srcrt
!= NULL
) {
596 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)opt
->srcrt
;
598 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
599 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
602 ipv6_addr_copy(&fl
.fl6_src
, &ireq6
->loc_addr
);
603 fl
.oif
= sk
->sk_bound_dev_if
;
604 fl
.fl_ip_dport
= inet_rsk(req
)->rmt_port
;
605 fl
.fl_ip_sport
= inet_sk(sk
)->sport
;
606 security_sk_classify_flow(sk
, &fl
);
608 if (ip6_dst_lookup(sk
, &dst
, &fl
))
612 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
614 if ((xfrm_lookup(&dst
, &fl
, sk
, 0)) < 0)
618 newsk
= dccp_create_openreq_child(sk
, req
, skb
);
623 * No need to charge this sock to the relevant IPv6 refcnt debug socks
624 * count here, dccp_create_openreq_child now does this for us, see the
625 * comment in that function for the gory details. -acme
628 __ip6_dst_store(newsk
, dst
, NULL
, NULL
);
629 newsk
->sk_route_caps
= dst
->dev
->features
& ~(NETIF_F_IP_CSUM
|
631 newdp6
= (struct dccp6_sock
*)newsk
;
632 newinet
= inet_sk(newsk
);
633 newinet
->pinet6
= &newdp6
->inet6
;
634 newdp
= dccp_sk(newsk
);
635 newnp
= inet6_sk(newsk
);
637 memcpy(newnp
, np
, sizeof(struct ipv6_pinfo
));
639 ipv6_addr_copy(&newnp
->daddr
, &ireq6
->rmt_addr
);
640 ipv6_addr_copy(&newnp
->saddr
, &ireq6
->loc_addr
);
641 ipv6_addr_copy(&newnp
->rcv_saddr
, &ireq6
->loc_addr
);
642 newsk
->sk_bound_dev_if
= ireq6
->iif
;
644 /* Now IPv6 options...
646 First: no IPv4 options.
651 newnp
->rxopt
.all
= np
->rxopt
.all
;
653 /* Clone pktoptions received with SYN */
654 newnp
->pktoptions
= NULL
;
655 if (ireq6
->pktopts
!= NULL
) {
656 newnp
->pktoptions
= skb_clone(ireq6
->pktopts
, GFP_ATOMIC
);
657 kfree_skb(ireq6
->pktopts
);
658 ireq6
->pktopts
= NULL
;
659 if (newnp
->pktoptions
)
660 skb_set_owner_r(newnp
->pktoptions
, newsk
);
663 newnp
->mcast_oif
= inet6_iif(skb
);
664 newnp
->mcast_hops
= skb
->nh
.ipv6h
->hop_limit
;
667 * Clone native IPv6 options from listening socket (if any)
669 * Yes, keeping reference count would be much more clever, but we make
670 * one more one thing there: reattach optmem to newsk.
673 newnp
->opt
= ipv6_dup_options(newsk
, opt
);
675 sock_kfree_s(sk
, opt
, opt
->tot_len
);
678 inet_csk(newsk
)->icsk_ext_hdr_len
= 0;
679 if (newnp
->opt
!= NULL
)
680 inet_csk(newsk
)->icsk_ext_hdr_len
= (newnp
->opt
->opt_nflen
+
681 newnp
->opt
->opt_flen
);
683 dccp_sync_mss(newsk
, dst_mtu(dst
));
685 newinet
->daddr
= newinet
->saddr
= newinet
->rcv_saddr
= LOOPBACK4_IPV6
;
687 __inet6_hash(&dccp_hashinfo
, newsk
);
688 inet_inherit_port(&dccp_hashinfo
, sk
, newsk
);
693 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS
);
695 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS
);
696 if (opt
!= NULL
&& opt
!= np
->opt
)
697 sock_kfree_s(sk
, opt
, opt
->tot_len
);
702 /* The socket must have it's spinlock held when we get
705 * We have a potential double-lock case here, so even when
706 * doing backlog processing we use the BH locking scheme.
707 * This is because we cannot sleep with the original spinlock
710 static int dccp_v6_do_rcv(struct sock
*sk
, struct sk_buff
*skb
)
712 struct ipv6_pinfo
*np
= inet6_sk(sk
);
713 struct sk_buff
*opt_skb
= NULL
;
715 /* Imagine: socket is IPv6. IPv4 packet arrives,
716 goes to IPv4 receive handler and backlogged.
717 From backlog it always goes here. Kerboom...
718 Fortunately, dccp_rcv_established and rcv_established
719 handle them correctly, but it is not case with
720 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
723 if (skb
->protocol
== htons(ETH_P_IP
))
724 return dccp_v4_do_rcv(sk
, skb
);
726 if (sk_filter(sk
, skb
))
730 * socket locking is here for SMP purposes as backlog rcv is currently
731 * called with bh processing disabled.
734 /* Do Stevens' IPV6_PKTOPTIONS.
736 Yes, guys, it is the only place in our code, where we
737 may make it not affecting IPv4.
738 The rest of code is protocol independent,
739 and I do not like idea to uglify IPv4.
741 Actually, all the idea behind IPV6_PKTOPTIONS
742 looks not very well thought. For now we latch
743 options, received in the last packet, enqueued
744 by tcp. Feel free to propose better solution.
749 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
750 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
752 opt_skb
= skb_clone(skb
, GFP_ATOMIC
);
754 if (sk
->sk_state
== DCCP_OPEN
) { /* Fast path */
755 if (dccp_rcv_established(sk
, skb
, dccp_hdr(skb
), skb
->len
))
758 /* XXX This is where we would goto ipv6_pktoptions. */
759 __kfree_skb(opt_skb
);
764 if (sk
->sk_state
== DCCP_LISTEN
) {
765 struct sock
*nsk
= dccp_v6_hnd_req(sk
, skb
);
770 * Queue it on the new socket if the new socket is active,
771 * otherwise we just shortcircuit this and continue with
775 if (dccp_child_process(sk
, nsk
, skb
))
778 __kfree_skb(opt_skb
);
783 if (dccp_rcv_state_process(sk
, skb
, dccp_hdr(skb
), skb
->len
))
786 /* XXX This is where we would goto ipv6_pktoptions. */
787 __kfree_skb(opt_skb
);
792 dccp_v6_ctl_send_reset(skb
);
795 __kfree_skb(opt_skb
);
800 static int dccp_v6_rcv(struct sk_buff
**pskb
)
802 const struct dccp_hdr
*dh
;
803 struct sk_buff
*skb
= *pskb
;
806 /* Step 1: Check header basics: */
808 if (dccp_invalid_packet(skb
))
813 DCCP_SKB_CB(skb
)->dccpd_seq
= dccp_hdr_seq(skb
);
814 DCCP_SKB_CB(skb
)->dccpd_type
= dh
->dccph_type
;
816 if (dccp_packet_without_ack(skb
))
817 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= DCCP_PKT_WITHOUT_ACK_SEQ
;
819 DCCP_SKB_CB(skb
)->dccpd_ack_seq
= dccp_hdr_ack_seq(skb
);
822 * Look up flow ID in table and get corresponding socket */
823 sk
= __inet6_lookup(&dccp_hashinfo
, &skb
->nh
.ipv6h
->saddr
,
825 &skb
->nh
.ipv6h
->daddr
, ntohs(dh
->dccph_dport
),
830 * Generate Reset(No Connection) unless P.type == Reset
831 * Drop packet and return
834 dccp_pr_debug("failed to look up flow ID in table and "
835 "get corresponding socket\n");
841 * ... or S.state == TIMEWAIT,
842 * Generate Reset(No Connection) unless P.type == Reset
843 * Drop packet and return
845 if (sk
->sk_state
== DCCP_TIME_WAIT
) {
846 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
847 inet_twsk_put(inet_twsk(sk
));
851 if (!xfrm6_policy_check(sk
, XFRM_POLICY_IN
, skb
))
852 goto discard_and_relse
;
854 return sk_receive_skb(sk
, skb
) ? -1 : 0;
857 if (!xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
861 * Generate Reset(No Connection) unless P.type == Reset
862 * Drop packet and return
864 if (dh
->dccph_type
!= DCCP_PKT_RESET
) {
865 DCCP_SKB_CB(skb
)->dccpd_reset_code
=
866 DCCP_RESET_CODE_NO_CONNECTION
;
867 dccp_v6_ctl_send_reset(skb
);
879 static int dccp_v6_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
882 struct sockaddr_in6
*usin
= (struct sockaddr_in6
*)uaddr
;
883 struct inet_connection_sock
*icsk
= inet_csk(sk
);
884 struct inet_sock
*inet
= inet_sk(sk
);
885 struct ipv6_pinfo
*np
= inet6_sk(sk
);
886 struct dccp_sock
*dp
= dccp_sk(sk
);
887 struct in6_addr
*saddr
= NULL
, *final_p
= NULL
, final
;
889 struct dst_entry
*dst
;
893 dp
->dccps_role
= DCCP_ROLE_CLIENT
;
895 if (addr_len
< SIN6_LEN_RFC2133
)
898 if (usin
->sin6_family
!= AF_INET6
)
899 return -EAFNOSUPPORT
;
901 memset(&fl
, 0, sizeof(fl
));
904 fl
.fl6_flowlabel
= usin
->sin6_flowinfo
& IPV6_FLOWINFO_MASK
;
905 IP6_ECN_flow_init(fl
.fl6_flowlabel
);
906 if (fl
.fl6_flowlabel
& IPV6_FLOWLABEL_MASK
) {
907 struct ip6_flowlabel
*flowlabel
;
908 flowlabel
= fl6_sock_lookup(sk
, fl
.fl6_flowlabel
);
909 if (flowlabel
== NULL
)
911 ipv6_addr_copy(&usin
->sin6_addr
, &flowlabel
->dst
);
912 fl6_sock_release(flowlabel
);
916 * connect() to INADDR_ANY means loopback (BSD'ism).
918 if (ipv6_addr_any(&usin
->sin6_addr
))
919 usin
->sin6_addr
.s6_addr
[15] = 1;
921 addr_type
= ipv6_addr_type(&usin
->sin6_addr
);
923 if (addr_type
& IPV6_ADDR_MULTICAST
)
926 if (addr_type
& IPV6_ADDR_LINKLOCAL
) {
927 if (addr_len
>= sizeof(struct sockaddr_in6
) &&
928 usin
->sin6_scope_id
) {
929 /* If interface is set while binding, indices
932 if (sk
->sk_bound_dev_if
&&
933 sk
->sk_bound_dev_if
!= usin
->sin6_scope_id
)
936 sk
->sk_bound_dev_if
= usin
->sin6_scope_id
;
939 /* Connect to link-local address requires an interface */
940 if (!sk
->sk_bound_dev_if
)
944 ipv6_addr_copy(&np
->daddr
, &usin
->sin6_addr
);
945 np
->flow_label
= fl
.fl6_flowlabel
;
950 if (addr_type
== IPV6_ADDR_MAPPED
) {
951 u32 exthdrlen
= icsk
->icsk_ext_hdr_len
;
952 struct sockaddr_in sin
;
954 SOCK_DEBUG(sk
, "connect: ipv4 mapped\n");
956 if (__ipv6_only_sock(sk
))
959 sin
.sin_family
= AF_INET
;
960 sin
.sin_port
= usin
->sin6_port
;
961 sin
.sin_addr
.s_addr
= usin
->sin6_addr
.s6_addr32
[3];
963 icsk
->icsk_af_ops
= &dccp_ipv6_mapped
;
964 sk
->sk_backlog_rcv
= dccp_v4_do_rcv
;
966 err
= dccp_v4_connect(sk
, (struct sockaddr
*)&sin
, sizeof(sin
));
968 icsk
->icsk_ext_hdr_len
= exthdrlen
;
969 icsk
->icsk_af_ops
= &dccp_ipv6_af_ops
;
970 sk
->sk_backlog_rcv
= dccp_v6_do_rcv
;
973 ipv6_addr_set(&np
->saddr
, 0, 0, htonl(0x0000FFFF),
975 ipv6_addr_set(&np
->rcv_saddr
, 0, 0, htonl(0x0000FFFF),
982 if (!ipv6_addr_any(&np
->rcv_saddr
))
983 saddr
= &np
->rcv_saddr
;
985 fl
.proto
= IPPROTO_DCCP
;
986 ipv6_addr_copy(&fl
.fl6_dst
, &np
->daddr
);
987 ipv6_addr_copy(&fl
.fl6_src
, saddr
? saddr
: &np
->saddr
);
988 fl
.oif
= sk
->sk_bound_dev_if
;
989 fl
.fl_ip_dport
= usin
->sin6_port
;
990 fl
.fl_ip_sport
= inet
->sport
;
991 security_sk_classify_flow(sk
, &fl
);
993 if (np
->opt
!= NULL
&& np
->opt
->srcrt
!= NULL
) {
994 const struct rt0_hdr
*rt0
= (struct rt0_hdr
*)np
->opt
->srcrt
;
996 ipv6_addr_copy(&final
, &fl
.fl6_dst
);
997 ipv6_addr_copy(&fl
.fl6_dst
, rt0
->addr
);
1001 err
= ip6_dst_lookup(sk
, &dst
, &fl
);
1006 ipv6_addr_copy(&fl
.fl6_dst
, final_p
);
1008 err
= xfrm_lookup(&dst
, &fl
, sk
, 0);
1012 if (saddr
== NULL
) {
1013 saddr
= &fl
.fl6_src
;
1014 ipv6_addr_copy(&np
->rcv_saddr
, saddr
);
1017 /* set the source address */
1018 ipv6_addr_copy(&np
->saddr
, saddr
);
1019 inet
->rcv_saddr
= LOOPBACK4_IPV6
;
1021 __ip6_dst_store(sk
, dst
, NULL
, NULL
);
1023 icsk
->icsk_ext_hdr_len
= 0;
1024 if (np
->opt
!= NULL
)
1025 icsk
->icsk_ext_hdr_len
= (np
->opt
->opt_flen
+
1026 np
->opt
->opt_nflen
);
1028 inet
->dport
= usin
->sin6_port
;
1030 dccp_set_state(sk
, DCCP_REQUESTING
);
1031 err
= inet6_hash_connect(&dccp_death_row
, sk
);
1036 dp
->dccps_gar
= secure_dccp_v6_sequence_number(np
->saddr
.s6_addr32
,
1037 np
->daddr
.s6_addr32
,
1041 err
= dccp_connect(sk
);
1048 dccp_set_state(sk
, DCCP_CLOSED
);
1052 sk
->sk_route_caps
= 0;
1056 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops
= {
1057 .queue_xmit
= inet6_csk_xmit
,
1058 .send_check
= dccp_v6_send_check
,
1059 .rebuild_header
= inet6_sk_rebuild_header
,
1060 .conn_request
= dccp_v6_conn_request
,
1061 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1062 .net_header_len
= sizeof(struct ipv6hdr
),
1063 .setsockopt
= ipv6_setsockopt
,
1064 .getsockopt
= ipv6_getsockopt
,
1065 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1066 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1067 #ifdef CONFIG_COMPAT
1068 .compat_setsockopt
= compat_ipv6_setsockopt
,
1069 .compat_getsockopt
= compat_ipv6_getsockopt
,
1074 * DCCP over IPv4 via INET6 API
1076 static struct inet_connection_sock_af_ops dccp_ipv6_mapped
= {
1077 .queue_xmit
= ip_queue_xmit
,
1078 .send_check
= dccp_v4_send_check
,
1079 .rebuild_header
= inet_sk_rebuild_header
,
1080 .conn_request
= dccp_v6_conn_request
,
1081 .syn_recv_sock
= dccp_v6_request_recv_sock
,
1082 .net_header_len
= sizeof(struct iphdr
),
1083 .setsockopt
= ipv6_setsockopt
,
1084 .getsockopt
= ipv6_getsockopt
,
1085 .addr2sockaddr
= inet6_csk_addr2sockaddr
,
1086 .sockaddr_len
= sizeof(struct sockaddr_in6
),
1087 #ifdef CONFIG_COMPAT
1088 .compat_setsockopt
= compat_ipv6_setsockopt
,
1089 .compat_getsockopt
= compat_ipv6_getsockopt
,
1093 /* NOTE: A lot of things set to zero explicitly by call to
1094 * sk_alloc() so need not be done here.
1096 static int dccp_v6_init_sock(struct sock
*sk
)
1098 static __u8 dccp_v6_ctl_sock_initialized
;
1099 int err
= dccp_init_sock(sk
, dccp_v6_ctl_sock_initialized
);
1102 if (unlikely(!dccp_v6_ctl_sock_initialized
))
1103 dccp_v6_ctl_sock_initialized
= 1;
1104 inet_csk(sk
)->icsk_af_ops
= &dccp_ipv6_af_ops
;
1110 static int dccp_v6_destroy_sock(struct sock
*sk
)
1112 dccp_destroy_sock(sk
);
1113 return inet6_destroy_sock(sk
);
1116 static struct timewait_sock_ops dccp6_timewait_sock_ops
= {
1117 .twsk_obj_size
= sizeof(struct dccp6_timewait_sock
),
1120 static struct proto dccp_v6_prot
= {
1122 .owner
= THIS_MODULE
,
1123 .close
= dccp_close
,
1124 .connect
= dccp_v6_connect
,
1125 .disconnect
= dccp_disconnect
,
1126 .ioctl
= dccp_ioctl
,
1127 .init
= dccp_v6_init_sock
,
1128 .setsockopt
= dccp_setsockopt
,
1129 .getsockopt
= dccp_getsockopt
,
1130 .sendmsg
= dccp_sendmsg
,
1131 .recvmsg
= dccp_recvmsg
,
1132 .backlog_rcv
= dccp_v6_do_rcv
,
1133 .hash
= dccp_v6_hash
,
1134 .unhash
= dccp_unhash
,
1135 .accept
= inet_csk_accept
,
1136 .get_port
= dccp_v6_get_port
,
1137 .shutdown
= dccp_shutdown
,
1138 .destroy
= dccp_v6_destroy_sock
,
1139 .orphan_count
= &dccp_orphan_count
,
1140 .max_header
= MAX_DCCP_HEADER
,
1141 .obj_size
= sizeof(struct dccp6_sock
),
1142 .rsk_prot
= &dccp6_request_sock_ops
,
1143 .twsk_prot
= &dccp6_timewait_sock_ops
,
1144 #ifdef CONFIG_COMPAT
1145 .compat_setsockopt
= compat_dccp_setsockopt
,
1146 .compat_getsockopt
= compat_dccp_getsockopt
,
1150 static struct inet6_protocol dccp_v6_protocol
= {
1151 .handler
= dccp_v6_rcv
,
1152 .err_handler
= dccp_v6_err
,
1153 .flags
= INET6_PROTO_NOPOLICY
| INET6_PROTO_FINAL
,
1156 static struct proto_ops inet6_dccp_ops
= {
1158 .owner
= THIS_MODULE
,
1159 .release
= inet6_release
,
1161 .connect
= inet_stream_connect
,
1162 .socketpair
= sock_no_socketpair
,
1163 .accept
= inet_accept
,
1164 .getname
= inet6_getname
,
1166 .ioctl
= inet6_ioctl
,
1167 .listen
= inet_dccp_listen
,
1168 .shutdown
= inet_shutdown
,
1169 .setsockopt
= sock_common_setsockopt
,
1170 .getsockopt
= sock_common_getsockopt
,
1171 .sendmsg
= inet_sendmsg
,
1172 .recvmsg
= sock_common_recvmsg
,
1173 .mmap
= sock_no_mmap
,
1174 .sendpage
= sock_no_sendpage
,
1175 #ifdef CONFIG_COMPAT
1176 .compat_setsockopt
= compat_sock_common_setsockopt
,
1177 .compat_getsockopt
= compat_sock_common_getsockopt
,
1181 static struct inet_protosw dccp_v6_protosw
= {
1183 .protocol
= IPPROTO_DCCP
,
1184 .prot
= &dccp_v6_prot
,
1185 .ops
= &inet6_dccp_ops
,
1187 .flags
= INET_PROTOSW_ICSK
,
1190 static int __init
dccp_v6_init(void)
1192 int err
= proto_register(&dccp_v6_prot
, 1);
1197 err
= inet6_add_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1199 goto out_unregister_proto
;
1201 inet6_register_protosw(&dccp_v6_protosw
);
1203 err
= inet_csk_ctl_sock_create(&dccp_v6_ctl_socket
, PF_INET6
,
1204 SOCK_DCCP
, IPPROTO_DCCP
);
1206 goto out_unregister_protosw
;
1209 out_unregister_protosw
:
1210 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1211 inet6_unregister_protosw(&dccp_v6_protosw
);
1212 out_unregister_proto
:
1213 proto_unregister(&dccp_v6_prot
);
1217 static void __exit
dccp_v6_exit(void)
1219 inet6_del_protocol(&dccp_v6_protocol
, IPPROTO_DCCP
);
1220 inet6_unregister_protosw(&dccp_v6_protosw
);
1221 proto_unregister(&dccp_v6_prot
);
1224 module_init(dccp_v6_init
);
1225 module_exit(dccp_v6_exit
);
1228 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1229 * values directly, Also cover the case where the protocol is not specified,
1230 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1232 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-33-type-6");
1233 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-0-type-6");
1234 MODULE_LICENSE("GPL");
1235 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1236 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");