blob: 04cb17d4b0cea9e9a0eac62f7e7f7135d7b9337c [file] [log] [blame]
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001/*
2 * DCCP over IPv6
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08003 * Linux INET6 implementation
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08004 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
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.
13 */
14
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080015#include <linux/module.h>
16#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080018#include <linux/xfrm.h>
19
20#include <net/addrconf.h>
21#include <net/inet_common.h>
22#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080024#include <net/inet6_connection_sock.h>
25#include <net/inet6_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/ipv6.h>
28#include <net/protocol.h>
29#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080030#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080031#include <net/xfrm.h>
David S. Miller6e5714e2011-08-03 20:50:44 -070032#include <net/secure_seq.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080033
34#include "dccp.h"
35#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070036#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080037
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070038/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080039
Stephen Hemminger3b401a82009-09-01 19:25:04 +000040static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
41static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080042
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080043static void dccp_v6_hash(struct sock *sk)
44{
45 if (sk->sk_state != DCCP_CLOSED) {
46 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080047 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080048 return;
49 }
50 local_bh_disable();
Eric Dumazet9327f702009-12-04 03:46:54 +000051 __inet6_hash(sk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080052 local_bh_enable();
53 }
54}
55
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020056/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080057static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +000058 const struct in6_addr *saddr,
59 const struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080060{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020061 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
62}
63
Herbert Xubb296242010-04-11 02:15:55 +000064static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020065{
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
68
69 dccp_csum_outgoing(skb);
Eric Dumazetefe42082013-10-03 15:42:29 -070070 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080071}
72
David S. Miller6e5714e2011-08-03 20:50:44 -070073static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
Gerrit Renkerd7f73652006-11-13 13:34:38 -020074{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070075 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
76 ipv6_hdr(skb)->saddr.s6_addr32,
Gerrit Renkerd7f73652006-11-13 13:34:38 -020077 dccp_hdr(skb)->dccph_dport,
78 dccp_hdr(skb)->dccph_sport );
79
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080080}
81
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080082static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070083 u8 type, u8 code, int offset, __be32 info)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080084{
Eric Dumazetb71d1d42011-04-22 04:53:02 +000085 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080086 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
Wei Yongjune0bcfb02008-07-26 11:59:10 +010087 struct dccp_sock *dp;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080088 struct ipv6_pinfo *np;
89 struct sock *sk;
90 int err;
91 __u64 seq;
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -070092 struct net *net = dev_net(skb->dev);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080093
Wei Yongjun860239c2008-07-26 11:59:11 +010094 if (skb->len < offset + sizeof(*dh) ||
95 skb->len < offset + __dccp_basic_hdr_len(dh)) {
Denis V. Luneve41b5362008-10-08 10:33:26 -070096 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
97 ICMP6_MIB_INERRORS);
Wei Yongjun860239c2008-07-26 11:59:11 +010098 return;
99 }
100
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -0700101 sk = inet6_lookup(net, &dccp_hashinfo,
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700102 &hdr->daddr, dh->dccph_dport,
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800103 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800104
105 if (sk == NULL) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700106 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
107 ICMP6_MIB_INERRORS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800108 return;
109 }
110
111 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700112 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800113 return;
114 }
115
116 bh_lock_sock(sk);
117 if (sock_owned_by_user(sk))
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700118 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800119
120 if (sk->sk_state == DCCP_CLOSED)
121 goto out;
122
Wei Yongjune0bcfb02008-07-26 11:59:10 +0100123 dp = dccp_sk(sk);
124 seq = dccp_hdr_seq(dh);
125 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
126 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
127 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
128 goto out;
129 }
130
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800131 np = inet6_sk(sk);
132
David S. Millerec18d9a2012-07-12 00:25:15 -0700133 if (type == NDISC_REDIRECT) {
134 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
135
David S. Miller1ed5c482012-07-12 00:41:25 -0700136 if (dst)
David S. Miller6700c272012-07-17 03:29:28 -0700137 dst->ops->redirect(dst, sk, skb);
Duan Jiongbd784a12013-09-18 20:03:27 +0800138 goto out;
David S. Millerec18d9a2012-07-12 00:25:15 -0700139 }
140
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800141 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800142 struct dst_entry *dst = NULL;
143
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100144 if (!ip6_sk_accept_pmtu(sk))
145 goto out;
146
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800147 if (sock_owned_by_user(sk))
148 goto out;
149 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
150 goto out;
151
David S. Miller35ad9b92012-07-16 03:44:56 -0700152 dst = inet6_csk_update_pmtu(sk, ntohl(info));
153 if (!dst)
154 goto out;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800155
David S. Miller35ad9b92012-07-16 03:44:56 -0700156 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800157 dccp_sync_mss(sk, dst_mtu(dst));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800158 goto out;
159 }
160
161 icmpv6_err_convert(type, code, &err);
162
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800163 /* Might be for an request_sock */
164 switch (sk->sk_state) {
165 struct request_sock *req, **prev;
166 case DCCP_LISTEN:
167 if (sock_owned_by_user(sk))
168 goto out;
169
170 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
171 &hdr->daddr, &hdr->saddr,
172 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800173 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800174 goto out;
175
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800176 /*
177 * ICMPs are not backlogged, hence we cannot get an established
178 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800179 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700180 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800181
Samuel Jerof541fb72012-02-26 18:22:02 -0700182 if (!between48(seq, dccp_rsk(req)->dreq_iss,
183 dccp_rsk(req)->dreq_gss)) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700184 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800185 goto out;
186 }
187
188 inet_csk_reqsk_queue_drop(sk, req, prev);
189 goto out;
190
191 case DCCP_REQUESTING:
192 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800193 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800194 if (!sock_owned_by_user(sk)) {
195 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
196 sk->sk_err = err;
197 /*
198 * Wake people up to see the error
199 * (see connect in sock.c)
200 */
201 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800202 dccp_done(sk);
203 } else
204 sk->sk_err_soft = err;
205 goto out;
206 }
207
208 if (!sock_owned_by_user(sk) && np->recverr) {
209 sk->sk_err = err;
210 sk->sk_error_report(sk);
211 } else
212 sk->sk_err_soft = err;
213
214out:
215 bh_unlock_sock(sk);
216 sock_put(sk);
217}
218
219
Christoph Paasch1a2c6182013-03-17 08:23:34 +0000220static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800221{
Eric Dumazet634fb9792013-10-09 15:21:29 -0700222 struct inet_request_sock *ireq = inet_rsk(req);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800223 struct ipv6_pinfo *np = inet6_sk(sk);
224 struct sk_buff *skb;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000225 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500226 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800227 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800228 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800229
David S. Miller4c9483b2011-03-12 16:22:43 -0500230 memset(&fl6, 0, sizeof(fl6));
231 fl6.flowi6_proto = IPPROTO_DCCP;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700232 fl6.daddr = ireq->ir_v6_rmt_addr;
233 fl6.saddr = ireq->ir_v6_loc_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500234 fl6.flowlabel = 0;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700235 fl6.flowi6_oif = ireq->ir_iif;
236 fl6.fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -0700237 fl6.fl6_sport = htons(ireq->ir_num);
David S. Miller4c9483b2011-03-12 16:22:43 -0500238 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800239
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800240
RongQing.Li0979e462012-07-01 17:19:00 +0000241 final_p = fl6_update_dst(&fl6, np->opt, &final);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800242
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200243 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800244 if (IS_ERR(dst)) {
245 err = PTR_ERR(dst);
246 dst = NULL;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800247 goto done;
David S. Miller68d0c6d2011-03-01 13:19:07 -0800248 }
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800249
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800250 skb = dccp_make_response(sk, dst, req);
251 if (skb != NULL) {
252 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800253
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200254 dh->dccph_checksum = dccp_v6_csum_finish(skb,
Eric Dumazet634fb9792013-10-09 15:21:29 -0700255 &ireq->ir_v6_loc_addr,
256 &ireq->ir_v6_rmt_addr);
257 fl6.daddr = ireq->ir_v6_rmt_addr;
RongQing.Li0979e462012-07-01 17:19:00 +0000258 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200259 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800260 }
261
262done:
David S. Miller0cbd7822006-01-31 17:53:37 -0800263 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800264 return err;
265}
266
267static void dccp_v6_reqsk_destructor(struct request_sock *req)
268{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800269 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Eric Dumazet634fb9792013-10-09 15:21:29 -0700270 kfree_skb(inet_rsk(req)->pktopts);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800271}
272
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800273static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800274{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000275 const struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800276 struct sk_buff *skb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500277 struct flowi6 fl6;
Eric Dumazetadf30902009-06-02 05:19:30 +0000278 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700279 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000280 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800281
Gerrit Renkere356d372007-09-26 14:35:19 -0300282 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800283 return;
284
285 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800286 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800287
Pavel Emelyanov02047742008-04-13 22:32:25 -0700288 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800289 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200290 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800291
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700292 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300293 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
294 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200295
David S. Miller4c9483b2011-03-12 16:22:43 -0500296 memset(&fl6, 0, sizeof(fl6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000297 fl6.daddr = rxip6h->saddr;
298 fl6.saddr = rxip6h->daddr;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200299
David S. Miller4c9483b2011-03-12 16:22:43 -0500300 fl6.flowi6_proto = IPPROTO_DCCP;
301 fl6.flowi6_oif = inet6_iif(rxskb);
David S. Miller1958b852011-03-12 16:36:19 -0500302 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
303 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500304 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800305
306 /* sk = NULL, but it is safe for now. RST socket required. */
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200307 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800308 if (!IS_ERR(dst)) {
309 skb_dst_set(skb, dst);
Eric Dumazetb903d322011-10-27 00:44:35 -0400310 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800311 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
312 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
313 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800314 }
315
316 kfree_skb(skb);
317}
318
Gerrit Renker73c9e022006-11-10 13:01:31 -0200319static struct request_sock_ops dccp6_request_sock_ops = {
320 .family = AF_INET6,
321 .obj_size = sizeof(struct dccp6_request_sock),
322 .rtx_syn_ack = dccp_v6_send_response,
323 .send_ack = dccp_reqsk_send_ack,
324 .destructor = dccp_v6_reqsk_destructor,
325 .send_reset = dccp_v6_ctl_send_reset,
Eric Dumazetc72e1182012-04-12 22:16:05 +0000326 .syn_ack_timeout = dccp_syn_ack_timeout,
Gerrit Renker73c9e022006-11-10 13:01:31 -0200327};
328
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800329static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
330{
331 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700332 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800333 struct sock *nsk;
334 struct request_sock **prev;
335 /* Find possible connection requests. */
336 struct request_sock *req = inet6_csk_search_req(sk, &prev,
337 dh->dccph_sport,
338 &iph->saddr,
339 &iph->daddr,
340 inet6_iif(skb));
341 if (req != NULL)
342 return dccp_check_req(sk, skb, req, prev);
343
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700344 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800345 &iph->saddr, dh->dccph_sport,
346 &iph->daddr, ntohs(dh->dccph_dport),
347 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800348 if (nsk != NULL) {
349 if (nsk->sk_state != DCCP_TIME_WAIT) {
350 bh_lock_sock(nsk);
351 return nsk;
352 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700353 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800354 return NULL;
355 }
356
357 return sk;
358}
359
360static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
361{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800362 struct request_sock *req;
363 struct dccp_request_sock *dreq;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700364 struct inet_request_sock *ireq;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800365 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200366 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800367 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800368
369 if (skb->protocol == htons(ETH_P_IP))
370 return dccp_v4_conn_request(sk, skb);
371
372 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700373 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800374
375 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700376 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800377 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200378 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800379 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800380 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800381 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700382 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800383 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800384 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800385
386 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
387 goto drop;
388
Octavian Purdila476eab82014-06-25 17:09:52 +0300389 req = inet_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800390 if (req == NULL)
391 goto drop;
392
Gerrit Renkerac757732008-11-04 23:55:49 -0800393 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
394 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800395
Gerrit Renker8b819412007-12-13 12:29:24 -0200396 dreq = dccp_rsk(req);
397 if (dccp_parse_options(sk, dreq, skb))
398 goto drop_and_free;
399
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700400 if (security_inet_conn_request(sk, skb, req))
401 goto drop_and_free;
402
Eric Dumazet634fb9792013-10-09 15:21:29 -0700403 ireq = inet_rsk(req);
404 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
405 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800406
407 if (ipv6_opt_accepted(sk, skb) ||
408 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
409 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
410 atomic_inc(&skb->users);
Eric Dumazet634fb9792013-10-09 15:21:29 -0700411 ireq->pktopts = skb;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800412 }
Eric Dumazet634fb9792013-10-09 15:21:29 -0700413 ireq->ir_iif = sk->sk_bound_dev_if;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800414
415 /* So that link locals have meaning */
416 if (!sk->sk_bound_dev_if &&
Eric Dumazet634fb9792013-10-09 15:21:29 -0700417 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
418 ireq->ir_iif = inet6_iif(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800419
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800420 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800421 * Step 3: Process LISTEN state
422 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200423 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424 *
Samuel Jerof541fb72012-02-26 18:22:02 -0700425 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800426 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800427 dreq->dreq_isr = dcb->dccpd_seq;
Samuel Jerof541fb72012-02-26 18:22:02 -0700428 dreq->dreq_gsr = dreq->dreq_isr;
Gerrit Renker865e9022006-11-13 13:31:50 -0200429 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Samuel Jerof541fb72012-02-26 18:22:02 -0700430 dreq->dreq_gss = dreq->dreq_iss;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800431 dreq->dreq_service = service;
432
Christoph Paasch1a2c6182013-03-17 08:23:34 +0000433 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800434 goto drop_and_free;
435
436 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
437 return 0;
438
439drop_and_free:
440 reqsk_free(req);
441drop:
442 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800443 return -1;
444}
445
446static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
447 struct sk_buff *skb,
448 struct request_sock *req,
449 struct dst_entry *dst)
450{
Eric Dumazet634fb9792013-10-09 15:21:29 -0700451 struct inet_request_sock *ireq = inet_rsk(req);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800452 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
453 struct inet_sock *newinet;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800454 struct dccp6_sock *newdp6;
455 struct sock *newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800456
457 if (skb->protocol == htons(ETH_P_IP)) {
458 /*
459 * v6 mapped
460 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800461 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800462 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800463 return NULL;
464
465 newdp6 = (struct dccp6_sock *)newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800466 newinet = inet_sk(newsk);
467 newinet->pinet6 = &newdp6->inet6;
468 newnp = inet6_sk(newsk);
469
470 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
471
Eric Dumazetefe42082013-10-03 15:42:29 -0700472 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800473
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000474 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800475
Eric Dumazetefe42082013-10-03 15:42:29 -0700476 newsk->sk_v6_rcv_saddr = newnp->saddr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800477
478 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
479 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
480 newnp->pktoptions = NULL;
481 newnp->opt = NULL;
482 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700483 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800484
485 /*
486 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
487 * here, dccp_create_openreq_child now does this for us, see the comment in
488 * that function for the gory details. -acme
489 */
490
491 /* It is tricky place. Until this moment IPv4 tcp
492 worked with IPv6 icsk.icsk_af_ops.
493 Sync it now.
494 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800495 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800496
497 return newsk;
498 }
499
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800500
501 if (sk_acceptq_is_full(sk))
502 goto out_overflow;
503
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800504 if (dst == NULL) {
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000505 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500506 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800507
David S. Miller4c9483b2011-03-12 16:22:43 -0500508 memset(&fl6, 0, sizeof(fl6));
509 fl6.flowi6_proto = IPPROTO_DCCP;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700510 fl6.daddr = ireq->ir_v6_rmt_addr;
RongQing.Li0979e462012-07-01 17:19:00 +0000511 final_p = fl6_update_dst(&fl6, np->opt, &final);
Eric Dumazet634fb9792013-10-09 15:21:29 -0700512 fl6.saddr = ireq->ir_v6_loc_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500513 fl6.flowi6_oif = sk->sk_bound_dev_if;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700514 fl6.fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -0700515 fl6.fl6_sport = htons(ireq->ir_num);
David S. Miller4c9483b2011-03-12 16:22:43 -0500516 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800517
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200518 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800519 if (IS_ERR(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800520 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800521 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800522
523 newsk = dccp_create_openreq_child(sk, req, skb);
524 if (newsk == NULL)
Balazs Scheidler093d2822010-10-21 13:06:43 +0200525 goto out_nonewsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800526
527 /*
528 * No need to charge this sock to the relevant IPv6 refcnt debug socks
529 * count here, dccp_create_openreq_child now does this for us, see the
530 * comment in that function for the gory details. -acme
531 */
532
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700533 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800534 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
535 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800536 newdp6 = (struct dccp6_sock *)newsk;
537 newinet = inet_sk(newsk);
538 newinet->pinet6 = &newdp6->inet6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800539 newnp = inet6_sk(newsk);
540
541 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
542
Eric Dumazet634fb9792013-10-09 15:21:29 -0700543 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
544 newnp->saddr = ireq->ir_v6_loc_addr;
545 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
546 newsk->sk_bound_dev_if = ireq->ir_iif;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800547
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800548 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800549
550 First: no IPv4 options.
551 */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000552 newinet->inet_opt = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800553
554 /* Clone RX bits */
555 newnp->rxopt.all = np->rxopt.all;
556
557 /* Clone pktoptions received with SYN */
558 newnp->pktoptions = NULL;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700559 if (ireq->pktopts != NULL) {
560 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
561 consume_skb(ireq->pktopts);
562 ireq->pktopts = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800563 if (newnp->pktoptions)
564 skb_set_owner_r(newnp->pktoptions, newsk);
565 }
566 newnp->opt = NULL;
567 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700568 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800569
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800570 /*
571 * Clone native IPv6 options from listening socket (if any)
572 *
573 * Yes, keeping reference count would be much more clever, but we make
574 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800575 */
RongQing.Li0979e462012-07-01 17:19:00 +0000576 if (np->opt != NULL)
577 newnp->opt = ipv6_dup_options(newsk, np->opt);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800578
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800579 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800580 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800581 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
582 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800583
584 dccp_sync_mss(newsk, dst_mtu(dst));
585
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000586 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
587 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800588
Balazs Scheidler093d2822010-10-21 13:06:43 +0200589 if (__inet_inherit_port(sk, newsk) < 0) {
Christoph Paasche337e242012-12-14 04:07:58 +0000590 inet_csk_prepare_forced_close(newsk);
591 dccp_done(newsk);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200592 goto out;
593 }
Eric Dumazet9327f702009-12-04 03:46:54 +0000594 __inet6_hash(newsk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800595
596 return newsk;
597
598out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700599 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200600out_nonewsk:
601 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800602out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700603 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800604 return NULL;
605}
606
607/* The socket must have it's spinlock held when we get
608 * here.
609 *
610 * We have a potential double-lock case here, so even when
611 * doing backlog processing we use the BH locking scheme.
612 * This is because we cannot sleep with the original spinlock
613 * held.
614 */
615static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
616{
617 struct ipv6_pinfo *np = inet6_sk(sk);
618 struct sk_buff *opt_skb = NULL;
619
620 /* Imagine: socket is IPv6. IPv4 packet arrives,
621 goes to IPv4 receive handler and backlogged.
622 From backlog it always goes here. Kerboom...
623 Fortunately, dccp_rcv_established and rcv_established
624 handle them correctly, but it is not case with
625 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
626 */
627
628 if (skb->protocol == htons(ETH_P_IP))
629 return dccp_v4_do_rcv(sk, skb);
630
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700631 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800632 goto discard;
633
634 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800635 * socket locking is here for SMP purposes as backlog rcv is currently
636 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800637 */
638
639 /* Do Stevens' IPV6_PKTOPTIONS.
640
641 Yes, guys, it is the only place in our code, where we
642 may make it not affecting IPv4.
643 The rest of code is protocol independent,
644 and I do not like idea to uglify IPv4.
645
646 Actually, all the idea behind IPV6_PKTOPTIONS
647 looks not very well thought. For now we latch
648 options, received in the last packet, enqueued
649 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900650 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800651 */
652 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200653 /*
654 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
655 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
656 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800657 opt_skb = skb_clone(skb, GFP_ATOMIC);
658
659 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
660 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
661 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700662 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200663 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700664 __kfree_skb(opt_skb);
665 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800666 return 0;
667 }
668
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200669 /*
670 * Step 3: Process LISTEN state
671 * If S.state == LISTEN,
672 * If P.type == Request or P contains a valid Init Cookie option,
673 * (* Must scan the packet's options to check for Init
674 * Cookies. Only Init Cookies are processed here,
675 * however; other options are processed in Step 8. This
676 * scan need only be performed if the endpoint uses Init
677 * Cookies *)
678 * (* Generate a new socket and switch to that socket *)
679 * Set S := new socket for this port pair
680 * S.state = RESPOND
681 * Choose S.ISS (initial seqno) or set from Init Cookies
682 * Initialize S.GAR := S.ISS
683 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
684 * Continue with S.state == RESPOND
685 * (* A Response packet will be generated in Step 11 *)
686 * Otherwise,
687 * Generate Reset(No Connection) unless P.type == Reset
688 * Drop packet and return
689 *
690 * NOTE: the check for the packet types is done in
691 * dccp_rcv_state_process
692 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800693 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800694 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800695
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800696 if (nsk == NULL)
697 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800698 /*
699 * Queue it on the new socket if the new socket is active,
700 * otherwise we just shortcircuit this and continue with
701 * the new socket..
702 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200703 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800704 if (dccp_child_process(sk, nsk, skb))
705 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800706 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800707 __kfree_skb(opt_skb);
708 return 0;
709 }
710 }
711
712 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
713 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700714 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200715 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700716 __kfree_skb(opt_skb);
717 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800718 return 0;
719
720reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800721 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800722discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800723 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800724 __kfree_skb(opt_skb);
725 kfree_skb(skb);
726 return 0;
727}
728
Herbert Xue5bbef22007-10-15 12:50:28 -0700729static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800730{
731 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800732 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200733 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800734
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200735 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800736
737 if (dccp_invalid_packet(skb))
738 goto discard_it;
739
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200740 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700741 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
742 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200743 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200744 goto discard_it;
745 }
746
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800747 dh = dccp_hdr(skb);
748
Gerrit Renkerfde20102007-10-24 10:12:09 -0200749 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800750 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
751
752 if (dccp_packet_without_ack(skb))
753 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
754 else
755 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
756
757 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200758 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700759 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
760 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800761 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800762 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200763 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800764 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200765 if (sk == NULL) {
766 dccp_pr_debug("failed to look up flow ID in table and "
767 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800768 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200769 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800770
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800771 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800772 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200773 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800774 * Generate Reset(No Connection) unless P.type == Reset
775 * Drop packet and return
776 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200777 if (sk->sk_state == DCCP_TIME_WAIT) {
778 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
779 inet_twsk_put(inet_twsk(sk));
780 goto no_dccp_socket;
781 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800782
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200783 /*
784 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200785 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
786 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200787 */
788 min_cov = dccp_sk(sk)->dccps_pcrlen;
789 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
790 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
791 dh->dccph_cscov, min_cov);
792 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
793 goto discard_and_relse;
794 }
795
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800796 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
797 goto discard_and_relse;
798
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200799 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800800
801no_dccp_socket:
802 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
803 goto discard_it;
804 /*
805 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200806 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800807 * Generate Reset(No Connection) unless P.type == Reset
808 * Drop packet and return
809 */
810 if (dh->dccph_type != DCCP_PKT_RESET) {
811 DCCP_SKB_CB(skb)->dccpd_reset_code =
812 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800813 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800814 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200815
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800816discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800817 kfree_skb(skb);
818 return 0;
819
820discard_and_relse:
821 sock_put(sk);
822 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823}
824
Gerrit Renker73c9e022006-11-10 13:01:31 -0200825static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
826 int addr_len)
827{
828 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
829 struct inet_connection_sock *icsk = inet_csk(sk);
830 struct inet_sock *inet = inet_sk(sk);
831 struct ipv6_pinfo *np = inet6_sk(sk);
832 struct dccp_sock *dp = dccp_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000833 struct in6_addr *saddr = NULL, *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500834 struct flowi6 fl6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200835 struct dst_entry *dst;
836 int addr_type;
837 int err;
838
839 dp->dccps_role = DCCP_ROLE_CLIENT;
840
841 if (addr_len < SIN6_LEN_RFC2133)
842 return -EINVAL;
843
844 if (usin->sin6_family != AF_INET6)
845 return -EAFNOSUPPORT;
846
David S. Miller4c9483b2011-03-12 16:22:43 -0500847 memset(&fl6, 0, sizeof(fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200848
849 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500850 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
851 IP6_ECN_flow_init(fl6.flowlabel);
852 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
Gerrit Renker73c9e022006-11-10 13:01:31 -0200853 struct ip6_flowlabel *flowlabel;
David S. Miller4c9483b2011-03-12 16:22:43 -0500854 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200855 if (flowlabel == NULL)
856 return -EINVAL;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200857 fl6_sock_release(flowlabel);
858 }
859 }
860 /*
861 * connect() to INADDR_ANY means loopback (BSD'ism).
862 */
863 if (ipv6_addr_any(&usin->sin6_addr))
864 usin->sin6_addr.s6_addr[15] = 1;
865
866 addr_type = ipv6_addr_type(&usin->sin6_addr);
867
868 if (addr_type & IPV6_ADDR_MULTICAST)
869 return -ENETUNREACH;
870
871 if (addr_type & IPV6_ADDR_LINKLOCAL) {
872 if (addr_len >= sizeof(struct sockaddr_in6) &&
873 usin->sin6_scope_id) {
874 /* If interface is set while binding, indices
875 * must coincide.
876 */
877 if (sk->sk_bound_dev_if &&
878 sk->sk_bound_dev_if != usin->sin6_scope_id)
879 return -EINVAL;
880
881 sk->sk_bound_dev_if = usin->sin6_scope_id;
882 }
883
884 /* Connect to link-local address requires an interface */
885 if (!sk->sk_bound_dev_if)
886 return -EINVAL;
887 }
888
Eric Dumazetefe42082013-10-03 15:42:29 -0700889 sk->sk_v6_daddr = usin->sin6_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500890 np->flow_label = fl6.flowlabel;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200891
892 /*
893 * DCCP over IPv4
894 */
895 if (addr_type == IPV6_ADDR_MAPPED) {
896 u32 exthdrlen = icsk->icsk_ext_hdr_len;
897 struct sockaddr_in sin;
898
899 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
900
901 if (__ipv6_only_sock(sk))
902 return -ENETUNREACH;
903
904 sin.sin_family = AF_INET;
905 sin.sin_port = usin->sin6_port;
906 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
907
908 icsk->icsk_af_ops = &dccp_ipv6_mapped;
909 sk->sk_backlog_rcv = dccp_v4_do_rcv;
910
911 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
912 if (err) {
913 icsk->icsk_ext_hdr_len = exthdrlen;
914 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
915 sk->sk_backlog_rcv = dccp_v6_do_rcv;
916 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200917 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000918 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
Eric Dumazetefe42082013-10-03 15:42:29 -0700919 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200920
921 return err;
922 }
923
Eric Dumazetefe42082013-10-03 15:42:29 -0700924 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
925 saddr = &sk->sk_v6_rcv_saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200926
David S. Miller4c9483b2011-03-12 16:22:43 -0500927 fl6.flowi6_proto = IPPROTO_DCCP;
Eric Dumazetefe42082013-10-03 15:42:29 -0700928 fl6.daddr = sk->sk_v6_daddr;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000929 fl6.saddr = saddr ? *saddr : np->saddr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500930 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500931 fl6.fl6_dport = usin->sin6_port;
932 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500933 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200934
David S. Miller4c9483b2011-03-12 16:22:43 -0500935 final_p = fl6_update_dst(&fl6, np->opt, &final);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200936
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200937 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800938 if (IS_ERR(dst)) {
939 err = PTR_ERR(dst);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200940 goto failure;
David S. Miller14e50e52007-05-24 18:17:54 -0700941 }
Gerrit Renker73c9e022006-11-10 13:01:31 -0200942
943 if (saddr == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500944 saddr = &fl6.saddr;
Eric Dumazetefe42082013-10-03 15:42:29 -0700945 sk->sk_v6_rcv_saddr = *saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200946 }
947
948 /* set the source address */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000949 np->saddr = *saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000950 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200951
952 __ip6_dst_store(sk, dst, NULL, NULL);
953
954 icsk->icsk_ext_hdr_len = 0;
955 if (np->opt != NULL)
956 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
957 np->opt->opt_nflen);
958
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000959 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200960
961 dccp_set_state(sk, DCCP_REQUESTING);
962 err = inet6_hash_connect(&dccp_death_row, sk);
963 if (err)
964 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -0200965
966 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
Eric Dumazetefe42082013-10-03 15:42:29 -0700967 sk->sk_v6_daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000968 inet->inet_sport,
969 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200970 err = dccp_connect(sk);
971 if (err)
972 goto late_failure;
973
974 return 0;
975
976late_failure:
977 dccp_set_state(sk, DCCP_CLOSED);
978 __sk_dst_reset(sk);
979failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000980 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200981 sk->sk_route_caps = 0;
982 return err;
983}
984
Stephen Hemminger3b401a82009-09-01 19:25:04 +0000985static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800986 .queue_xmit = inet6_csk_xmit,
987 .send_check = dccp_v6_send_check,
988 .rebuild_header = inet6_sk_rebuild_header,
989 .conn_request = dccp_v6_conn_request,
990 .syn_recv_sock = dccp_v6_request_recv_sock,
991 .net_header_len = sizeof(struct ipv6hdr),
992 .setsockopt = ipv6_setsockopt,
993 .getsockopt = ipv6_getsockopt,
994 .addr2sockaddr = inet6_csk_addr2sockaddr,
995 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800996 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800997#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800998 .compat_setsockopt = compat_ipv6_setsockopt,
999 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001000#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001001};
1002
1003/*
1004 * DCCP over IPv4 via INET6 API
1005 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001006static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001007 .queue_xmit = ip_queue_xmit,
1008 .send_check = dccp_v4_send_check,
1009 .rebuild_header = inet_sk_rebuild_header,
1010 .conn_request = dccp_v6_conn_request,
1011 .syn_recv_sock = dccp_v6_request_recv_sock,
1012 .net_header_len = sizeof(struct iphdr),
1013 .setsockopt = ipv6_setsockopt,
1014 .getsockopt = ipv6_getsockopt,
1015 .addr2sockaddr = inet6_csk_addr2sockaddr,
1016 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001017#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001018 .compat_setsockopt = compat_ipv6_setsockopt,
1019 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001020#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001021};
1022
1023/* NOTE: A lot of things set to zero explicitly by call to
1024 * sk_alloc() so need not be done here.
1025 */
1026static int dccp_v6_init_sock(struct sock *sk)
1027{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001028 static __u8 dccp_v6_ctl_sock_initialized;
1029 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001030
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001031 if (err == 0) {
1032 if (unlikely(!dccp_v6_ctl_sock_initialized))
1033 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001034 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001035 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001036
1037 return err;
1038}
1039
Brian Haley7d06b2e2008-06-14 17:04:49 -07001040static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001041{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001042 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001043 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001044}
1045
Gerrit Renker73c9e022006-11-10 13:01:31 -02001046static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1047 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1048};
1049
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001050static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001051 .name = "DCCPv6",
1052 .owner = THIS_MODULE,
1053 .close = dccp_close,
1054 .connect = dccp_v6_connect,
1055 .disconnect = dccp_disconnect,
1056 .ioctl = dccp_ioctl,
1057 .init = dccp_v6_init_sock,
1058 .setsockopt = dccp_setsockopt,
1059 .getsockopt = dccp_getsockopt,
1060 .sendmsg = dccp_sendmsg,
1061 .recvmsg = dccp_recvmsg,
1062 .backlog_rcv = dccp_v6_do_rcv,
1063 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001064 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001065 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001066 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001067 .shutdown = dccp_shutdown,
1068 .destroy = dccp_v6_destroy_sock,
1069 .orphan_count = &dccp_orphan_count,
1070 .max_header = MAX_DCCP_HEADER,
1071 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001072 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001073 .rsk_prot = &dccp6_request_sock_ops,
1074 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001075 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001076#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001077 .compat_setsockopt = compat_dccp_setsockopt,
1078 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001079#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001080};
1081
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001082static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001083 .handler = dccp_v6_rcv,
1084 .err_handler = dccp_v6_err,
1085 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001086};
1087
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001088static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001089 .family = PF_INET6,
1090 .owner = THIS_MODULE,
1091 .release = inet6_release,
1092 .bind = inet6_bind,
1093 .connect = inet_stream_connect,
1094 .socketpair = sock_no_socketpair,
1095 .accept = inet_accept,
1096 .getname = inet6_getname,
1097 .poll = dccp_poll,
1098 .ioctl = inet6_ioctl,
1099 .listen = inet_dccp_listen,
1100 .shutdown = inet_shutdown,
1101 .setsockopt = sock_common_setsockopt,
1102 .getsockopt = sock_common_getsockopt,
1103 .sendmsg = inet_sendmsg,
1104 .recvmsg = sock_common_recvmsg,
1105 .mmap = sock_no_mmap,
1106 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001107#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001108 .compat_setsockopt = compat_sock_common_setsockopt,
1109 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001110#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001111};
1112
1113static struct inet_protosw dccp_v6_protosw = {
1114 .type = SOCK_DCCP,
1115 .protocol = IPPROTO_DCCP,
1116 .prot = &dccp_v6_prot,
1117 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001118 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001119};
1120
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001121static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001122{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001123 if (dccp_hashinfo.bhash == NULL)
1124 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001125
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001126 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1127 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001128}
1129
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001130static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001131{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001132 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001133}
1134
1135static struct pernet_operations dccp_v6_ops = {
1136 .init = dccp_v6_init_net,
1137 .exit = dccp_v6_exit_net,
1138};
1139
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001140static int __init dccp_v6_init(void)
1141{
1142 int err = proto_register(&dccp_v6_prot, 1);
1143
1144 if (err != 0)
1145 goto out;
1146
1147 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1148 if (err != 0)
1149 goto out_unregister_proto;
1150
1151 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001152
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001153 err = register_pernet_subsys(&dccp_v6_ops);
1154 if (err != 0)
1155 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001156out:
1157 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001158
1159out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001160 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1161 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001162out_unregister_proto:
1163 proto_unregister(&dccp_v6_prot);
1164 goto out;
1165}
1166
1167static void __exit dccp_v6_exit(void)
1168{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001169 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001170 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1171 inet6_unregister_protosw(&dccp_v6_protosw);
1172 proto_unregister(&dccp_v6_prot);
1173}
1174
1175module_init(dccp_v6_init);
1176module_exit(dccp_v6_exit);
1177
1178/*
1179 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1180 * values directly, Also cover the case where the protocol is not specified,
1181 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1182 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001183MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1184MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001185MODULE_LICENSE("GPL");
1186MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1187MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");