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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
Eric Dumazet407640d2015-03-17 18:32:26 -0700389 req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk);
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;
Eric Dumazet3f66b082015-03-12 16:44:10 -0700406 ireq->ireq_family = AF_INET6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800407
Eric Dumazeta2247722014-09-27 09:50:56 -0700408 if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800409 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
410 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
411 atomic_inc(&skb->users);
Eric Dumazet634fb9792013-10-09 15:21:29 -0700412 ireq->pktopts = skb;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800413 }
Eric Dumazet634fb9792013-10-09 15:21:29 -0700414 ireq->ir_iif = sk->sk_bound_dev_if;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800415
416 /* So that link locals have meaning */
417 if (!sk->sk_bound_dev_if &&
Eric Dumazet634fb9792013-10-09 15:21:29 -0700418 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
419 ireq->ir_iif = inet6_iif(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800420
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800421 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800422 * Step 3: Process LISTEN state
423 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200424 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800425 *
Samuel Jerof541fb72012-02-26 18:22:02 -0700426 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800427 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800428 dreq->dreq_isr = dcb->dccpd_seq;
Samuel Jerof541fb72012-02-26 18:22:02 -0700429 dreq->dreq_gsr = dreq->dreq_isr;
Gerrit Renker865e9022006-11-13 13:31:50 -0200430 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Samuel Jerof541fb72012-02-26 18:22:02 -0700431 dreq->dreq_gss = dreq->dreq_iss;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800432 dreq->dreq_service = service;
433
Christoph Paasch1a2c6182013-03-17 08:23:34 +0000434 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800435 goto drop_and_free;
436
437 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
438 return 0;
439
440drop_and_free:
441 reqsk_free(req);
442drop:
443 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800444 return -1;
445}
446
447static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
448 struct sk_buff *skb,
449 struct request_sock *req,
450 struct dst_entry *dst)
451{
Eric Dumazet634fb9792013-10-09 15:21:29 -0700452 struct inet_request_sock *ireq = inet_rsk(req);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800453 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
454 struct inet_sock *newinet;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800455 struct dccp6_sock *newdp6;
456 struct sock *newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800457
458 if (skb->protocol == htons(ETH_P_IP)) {
459 /*
460 * v6 mapped
461 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800462 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800463 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800464 return NULL;
465
466 newdp6 = (struct dccp6_sock *)newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800467 newinet = inet_sk(newsk);
468 newinet->pinet6 = &newdp6->inet6;
469 newnp = inet6_sk(newsk);
470
471 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
472
Eric Dumazetefe42082013-10-03 15:42:29 -0700473 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800474
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000475 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800476
Eric Dumazetefe42082013-10-03 15:42:29 -0700477 newsk->sk_v6_rcv_saddr = newnp->saddr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800478
479 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
480 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
481 newnp->pktoptions = NULL;
482 newnp->opt = NULL;
483 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700484 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800485
486 /*
487 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
488 * here, dccp_create_openreq_child now does this for us, see the comment in
489 * that function for the gory details. -acme
490 */
491
492 /* It is tricky place. Until this moment IPv4 tcp
493 worked with IPv6 icsk.icsk_af_ops.
494 Sync it now.
495 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800496 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800497
498 return newsk;
499 }
500
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800501
502 if (sk_acceptq_is_full(sk))
503 goto out_overflow;
504
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800505 if (dst == NULL) {
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000506 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500507 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800508
David S. Miller4c9483b2011-03-12 16:22:43 -0500509 memset(&fl6, 0, sizeof(fl6));
510 fl6.flowi6_proto = IPPROTO_DCCP;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700511 fl6.daddr = ireq->ir_v6_rmt_addr;
RongQing.Li0979e462012-07-01 17:19:00 +0000512 final_p = fl6_update_dst(&fl6, np->opt, &final);
Eric Dumazet634fb9792013-10-09 15:21:29 -0700513 fl6.saddr = ireq->ir_v6_loc_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500514 fl6.flowi6_oif = sk->sk_bound_dev_if;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700515 fl6.fl6_dport = ireq->ir_rmt_port;
Eric Dumazetb44084c2013-10-10 00:04:37 -0700516 fl6.fl6_sport = htons(ireq->ir_num);
David S. Miller4c9483b2011-03-12 16:22:43 -0500517 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800518
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200519 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800520 if (IS_ERR(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800521 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800522 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800523
524 newsk = dccp_create_openreq_child(sk, req, skb);
525 if (newsk == NULL)
Balazs Scheidler093d2822010-10-21 13:06:43 +0200526 goto out_nonewsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800527
528 /*
529 * No need to charge this sock to the relevant IPv6 refcnt debug socks
530 * count here, dccp_create_openreq_child now does this for us, see the
531 * comment in that function for the gory details. -acme
532 */
533
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700534 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800535 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
536 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800537 newdp6 = (struct dccp6_sock *)newsk;
538 newinet = inet_sk(newsk);
539 newinet->pinet6 = &newdp6->inet6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800540 newnp = inet6_sk(newsk);
541
542 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
543
Eric Dumazet634fb9792013-10-09 15:21:29 -0700544 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
545 newnp->saddr = ireq->ir_v6_loc_addr;
546 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
547 newsk->sk_bound_dev_if = ireq->ir_iif;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800548
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800549 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800550
551 First: no IPv4 options.
552 */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000553 newinet->inet_opt = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800554
555 /* Clone RX bits */
556 newnp->rxopt.all = np->rxopt.all;
557
558 /* Clone pktoptions received with SYN */
559 newnp->pktoptions = NULL;
Eric Dumazet634fb9792013-10-09 15:21:29 -0700560 if (ireq->pktopts != NULL) {
561 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
562 consume_skb(ireq->pktopts);
563 ireq->pktopts = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800564 if (newnp->pktoptions)
565 skb_set_owner_r(newnp->pktoptions, newsk);
566 }
567 newnp->opt = NULL;
568 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700569 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800570
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800571 /*
572 * Clone native IPv6 options from listening socket (if any)
573 *
574 * Yes, keeping reference count would be much more clever, but we make
575 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800576 */
RongQing.Li0979e462012-07-01 17:19:00 +0000577 if (np->opt != NULL)
578 newnp->opt = ipv6_dup_options(newsk, np->opt);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800579
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800580 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800581 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800582 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
583 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800584
585 dccp_sync_mss(newsk, dst_mtu(dst));
586
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000587 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
588 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800589
Balazs Scheidler093d2822010-10-21 13:06:43 +0200590 if (__inet_inherit_port(sk, newsk) < 0) {
Christoph Paasche337e242012-12-14 04:07:58 +0000591 inet_csk_prepare_forced_close(newsk);
592 dccp_done(newsk);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200593 goto out;
594 }
Eric Dumazet9327f702009-12-04 03:46:54 +0000595 __inet6_hash(newsk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800596
597 return newsk;
598
599out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700600 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200601out_nonewsk:
602 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800603out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700604 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800605 return NULL;
606}
607
608/* The socket must have it's spinlock held when we get
609 * here.
610 *
611 * We have a potential double-lock case here, so even when
612 * doing backlog processing we use the BH locking scheme.
613 * This is because we cannot sleep with the original spinlock
614 * held.
615 */
616static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
617{
618 struct ipv6_pinfo *np = inet6_sk(sk);
619 struct sk_buff *opt_skb = NULL;
620
621 /* Imagine: socket is IPv6. IPv4 packet arrives,
622 goes to IPv4 receive handler and backlogged.
623 From backlog it always goes here. Kerboom...
624 Fortunately, dccp_rcv_established and rcv_established
625 handle them correctly, but it is not case with
626 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
627 */
628
629 if (skb->protocol == htons(ETH_P_IP))
630 return dccp_v4_do_rcv(sk, skb);
631
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700632 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800633 goto discard;
634
635 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800636 * socket locking is here for SMP purposes as backlog rcv is currently
637 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800638 */
639
640 /* Do Stevens' IPV6_PKTOPTIONS.
641
642 Yes, guys, it is the only place in our code, where we
643 may make it not affecting IPv4.
644 The rest of code is protocol independent,
645 and I do not like idea to uglify IPv4.
646
647 Actually, all the idea behind IPV6_PKTOPTIONS
648 looks not very well thought. For now we latch
649 options, received in the last packet, enqueued
650 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900651 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800652 */
653 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200654 /*
655 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
656 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
657 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800658 opt_skb = skb_clone(skb, GFP_ATOMIC);
659
660 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
661 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
662 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700663 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200664 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700665 __kfree_skb(opt_skb);
666 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800667 return 0;
668 }
669
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200670 /*
671 * Step 3: Process LISTEN state
672 * If S.state == LISTEN,
673 * If P.type == Request or P contains a valid Init Cookie option,
674 * (* Must scan the packet's options to check for Init
675 * Cookies. Only Init Cookies are processed here,
676 * however; other options are processed in Step 8. This
677 * scan need only be performed if the endpoint uses Init
678 * Cookies *)
679 * (* Generate a new socket and switch to that socket *)
680 * Set S := new socket for this port pair
681 * S.state = RESPOND
682 * Choose S.ISS (initial seqno) or set from Init Cookies
683 * Initialize S.GAR := S.ISS
684 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
685 * Continue with S.state == RESPOND
686 * (* A Response packet will be generated in Step 11 *)
687 * Otherwise,
688 * Generate Reset(No Connection) unless P.type == Reset
689 * Drop packet and return
690 *
691 * NOTE: the check for the packet types is done in
692 * dccp_rcv_state_process
693 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800694 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800695 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800696
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800697 if (nsk == NULL)
698 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800699 /*
700 * Queue it on the new socket if the new socket is active,
701 * otherwise we just shortcircuit this and continue with
702 * the new socket..
703 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200704 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800705 if (dccp_child_process(sk, nsk, skb))
706 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800707 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800708 __kfree_skb(opt_skb);
709 return 0;
710 }
711 }
712
713 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
714 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700715 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200716 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700717 __kfree_skb(opt_skb);
718 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800719 return 0;
720
721reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800722 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800723discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800724 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800725 __kfree_skb(opt_skb);
726 kfree_skb(skb);
727 return 0;
728}
729
Herbert Xue5bbef22007-10-15 12:50:28 -0700730static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800731{
732 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800733 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200734 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800735
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200736 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800737
738 if (dccp_invalid_packet(skb))
739 goto discard_it;
740
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200741 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700742 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
743 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200744 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200745 goto discard_it;
746 }
747
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800748 dh = dccp_hdr(skb);
749
Gerrit Renkerfde20102007-10-24 10:12:09 -0200750 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800751 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
752
753 if (dccp_packet_without_ack(skb))
754 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
755 else
756 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
757
758 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200759 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700760 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
Eric Dumazet870c3152014-10-17 09:17:20 -0700761 dh->dccph_sport, dh->dccph_dport,
762 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800763 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800764 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200765 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800766 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200767 if (sk == NULL) {
768 dccp_pr_debug("failed to look up flow ID in table and "
769 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800770 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200771 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800772
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800773 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800774 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200775 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800776 * Generate Reset(No Connection) unless P.type == Reset
777 * Drop packet and return
778 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200779 if (sk->sk_state == DCCP_TIME_WAIT) {
780 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
781 inet_twsk_put(inet_twsk(sk));
782 goto no_dccp_socket;
783 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800784
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200785 /*
786 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200787 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
788 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200789 */
790 min_cov = dccp_sk(sk)->dccps_pcrlen;
791 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
792 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
793 dh->dccph_cscov, min_cov);
794 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
795 goto discard_and_relse;
796 }
797
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800798 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
799 goto discard_and_relse;
800
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200801 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800802
803no_dccp_socket:
804 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
805 goto discard_it;
806 /*
807 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200808 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800809 * Generate Reset(No Connection) unless P.type == Reset
810 * Drop packet and return
811 */
812 if (dh->dccph_type != DCCP_PKT_RESET) {
813 DCCP_SKB_CB(skb)->dccpd_reset_code =
814 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800815 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800816 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200817
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800818discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800819 kfree_skb(skb);
820 return 0;
821
822discard_and_relse:
823 sock_put(sk);
824 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800825}
826
Gerrit Renker73c9e022006-11-10 13:01:31 -0200827static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
828 int addr_len)
829{
830 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
831 struct inet_connection_sock *icsk = inet_csk(sk);
832 struct inet_sock *inet = inet_sk(sk);
833 struct ipv6_pinfo *np = inet6_sk(sk);
834 struct dccp_sock *dp = dccp_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000835 struct in6_addr *saddr = NULL, *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500836 struct flowi6 fl6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200837 struct dst_entry *dst;
838 int addr_type;
839 int err;
840
841 dp->dccps_role = DCCP_ROLE_CLIENT;
842
843 if (addr_len < SIN6_LEN_RFC2133)
844 return -EINVAL;
845
846 if (usin->sin6_family != AF_INET6)
847 return -EAFNOSUPPORT;
848
David S. Miller4c9483b2011-03-12 16:22:43 -0500849 memset(&fl6, 0, sizeof(fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200850
851 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500852 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
853 IP6_ECN_flow_init(fl6.flowlabel);
854 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
Gerrit Renker73c9e022006-11-10 13:01:31 -0200855 struct ip6_flowlabel *flowlabel;
David S. Miller4c9483b2011-03-12 16:22:43 -0500856 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200857 if (flowlabel == NULL)
858 return -EINVAL;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200859 fl6_sock_release(flowlabel);
860 }
861 }
862 /*
863 * connect() to INADDR_ANY means loopback (BSD'ism).
864 */
865 if (ipv6_addr_any(&usin->sin6_addr))
866 usin->sin6_addr.s6_addr[15] = 1;
867
868 addr_type = ipv6_addr_type(&usin->sin6_addr);
869
870 if (addr_type & IPV6_ADDR_MULTICAST)
871 return -ENETUNREACH;
872
873 if (addr_type & IPV6_ADDR_LINKLOCAL) {
874 if (addr_len >= sizeof(struct sockaddr_in6) &&
875 usin->sin6_scope_id) {
876 /* If interface is set while binding, indices
877 * must coincide.
878 */
879 if (sk->sk_bound_dev_if &&
880 sk->sk_bound_dev_if != usin->sin6_scope_id)
881 return -EINVAL;
882
883 sk->sk_bound_dev_if = usin->sin6_scope_id;
884 }
885
886 /* Connect to link-local address requires an interface */
887 if (!sk->sk_bound_dev_if)
888 return -EINVAL;
889 }
890
Eric Dumazetefe42082013-10-03 15:42:29 -0700891 sk->sk_v6_daddr = usin->sin6_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500892 np->flow_label = fl6.flowlabel;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200893
894 /*
895 * DCCP over IPv4
896 */
897 if (addr_type == IPV6_ADDR_MAPPED) {
898 u32 exthdrlen = icsk->icsk_ext_hdr_len;
899 struct sockaddr_in sin;
900
901 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
902
903 if (__ipv6_only_sock(sk))
904 return -ENETUNREACH;
905
906 sin.sin_family = AF_INET;
907 sin.sin_port = usin->sin6_port;
908 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
909
910 icsk->icsk_af_ops = &dccp_ipv6_mapped;
911 sk->sk_backlog_rcv = dccp_v4_do_rcv;
912
913 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
914 if (err) {
915 icsk->icsk_ext_hdr_len = exthdrlen;
916 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
917 sk->sk_backlog_rcv = dccp_v6_do_rcv;
918 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200919 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000920 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
Eric Dumazetefe42082013-10-03 15:42:29 -0700921 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200922
923 return err;
924 }
925
Eric Dumazetefe42082013-10-03 15:42:29 -0700926 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
927 saddr = &sk->sk_v6_rcv_saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200928
David S. Miller4c9483b2011-03-12 16:22:43 -0500929 fl6.flowi6_proto = IPPROTO_DCCP;
Eric Dumazetefe42082013-10-03 15:42:29 -0700930 fl6.daddr = sk->sk_v6_daddr;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000931 fl6.saddr = saddr ? *saddr : np->saddr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500932 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500933 fl6.fl6_dport = usin->sin6_port;
934 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500935 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200936
David S. Miller4c9483b2011-03-12 16:22:43 -0500937 final_p = fl6_update_dst(&fl6, np->opt, &final);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200938
Steffen Klassert0e0d44a2013-08-28 08:04:14 +0200939 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800940 if (IS_ERR(dst)) {
941 err = PTR_ERR(dst);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200942 goto failure;
David S. Miller14e50e52007-05-24 18:17:54 -0700943 }
Gerrit Renker73c9e022006-11-10 13:01:31 -0200944
945 if (saddr == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500946 saddr = &fl6.saddr;
Eric Dumazetefe42082013-10-03 15:42:29 -0700947 sk->sk_v6_rcv_saddr = *saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200948 }
949
950 /* set the source address */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000951 np->saddr = *saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000952 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200953
954 __ip6_dst_store(sk, dst, NULL, NULL);
955
956 icsk->icsk_ext_hdr_len = 0;
957 if (np->opt != NULL)
958 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
959 np->opt->opt_nflen);
960
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000961 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200962
963 dccp_set_state(sk, DCCP_REQUESTING);
964 err = inet6_hash_connect(&dccp_death_row, sk);
965 if (err)
966 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -0200967
968 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
Eric Dumazetefe42082013-10-03 15:42:29 -0700969 sk->sk_v6_daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000970 inet->inet_sport,
971 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200972 err = dccp_connect(sk);
973 if (err)
974 goto late_failure;
975
976 return 0;
977
978late_failure:
979 dccp_set_state(sk, DCCP_CLOSED);
980 __sk_dst_reset(sk);
981failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000982 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200983 sk->sk_route_caps = 0;
984 return err;
985}
986
Stephen Hemminger3b401a82009-09-01 19:25:04 +0000987static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800988 .queue_xmit = inet6_csk_xmit,
989 .send_check = dccp_v6_send_check,
990 .rebuild_header = inet6_sk_rebuild_header,
991 .conn_request = dccp_v6_conn_request,
992 .syn_recv_sock = dccp_v6_request_recv_sock,
993 .net_header_len = sizeof(struct ipv6hdr),
994 .setsockopt = ipv6_setsockopt,
995 .getsockopt = ipv6_getsockopt,
996 .addr2sockaddr = inet6_csk_addr2sockaddr,
997 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800998 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800999#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001000 .compat_setsockopt = compat_ipv6_setsockopt,
1001 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001002#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001003};
1004
1005/*
1006 * DCCP over IPv4 via INET6 API
1007 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001008static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001009 .queue_xmit = ip_queue_xmit,
1010 .send_check = dccp_v4_send_check,
1011 .rebuild_header = inet_sk_rebuild_header,
1012 .conn_request = dccp_v6_conn_request,
1013 .syn_recv_sock = dccp_v6_request_recv_sock,
1014 .net_header_len = sizeof(struct iphdr),
1015 .setsockopt = ipv6_setsockopt,
1016 .getsockopt = ipv6_getsockopt,
1017 .addr2sockaddr = inet6_csk_addr2sockaddr,
1018 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001019#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001020 .compat_setsockopt = compat_ipv6_setsockopt,
1021 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001022#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001023};
1024
1025/* NOTE: A lot of things set to zero explicitly by call to
1026 * sk_alloc() so need not be done here.
1027 */
1028static int dccp_v6_init_sock(struct sock *sk)
1029{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001030 static __u8 dccp_v6_ctl_sock_initialized;
1031 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001032
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001033 if (err == 0) {
1034 if (unlikely(!dccp_v6_ctl_sock_initialized))
1035 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001036 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001037 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001038
1039 return err;
1040}
1041
Brian Haley7d06b2e2008-06-14 17:04:49 -07001042static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001043{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001044 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001045 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001046}
1047
Gerrit Renker73c9e022006-11-10 13:01:31 -02001048static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1049 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1050};
1051
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001052static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001053 .name = "DCCPv6",
1054 .owner = THIS_MODULE,
1055 .close = dccp_close,
1056 .connect = dccp_v6_connect,
1057 .disconnect = dccp_disconnect,
1058 .ioctl = dccp_ioctl,
1059 .init = dccp_v6_init_sock,
1060 .setsockopt = dccp_setsockopt,
1061 .getsockopt = dccp_getsockopt,
1062 .sendmsg = dccp_sendmsg,
1063 .recvmsg = dccp_recvmsg,
1064 .backlog_rcv = dccp_v6_do_rcv,
1065 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001066 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001067 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001068 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001069 .shutdown = dccp_shutdown,
1070 .destroy = dccp_v6_destroy_sock,
1071 .orphan_count = &dccp_orphan_count,
1072 .max_header = MAX_DCCP_HEADER,
1073 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001074 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001075 .rsk_prot = &dccp6_request_sock_ops,
1076 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001077 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001078#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001079 .compat_setsockopt = compat_dccp_setsockopt,
1080 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001081#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001082};
1083
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001084static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001085 .handler = dccp_v6_rcv,
1086 .err_handler = dccp_v6_err,
1087 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001088};
1089
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001090static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001091 .family = PF_INET6,
1092 .owner = THIS_MODULE,
1093 .release = inet6_release,
1094 .bind = inet6_bind,
1095 .connect = inet_stream_connect,
1096 .socketpair = sock_no_socketpair,
1097 .accept = inet_accept,
1098 .getname = inet6_getname,
1099 .poll = dccp_poll,
1100 .ioctl = inet6_ioctl,
1101 .listen = inet_dccp_listen,
1102 .shutdown = inet_shutdown,
1103 .setsockopt = sock_common_setsockopt,
1104 .getsockopt = sock_common_getsockopt,
1105 .sendmsg = inet_sendmsg,
1106 .recvmsg = sock_common_recvmsg,
1107 .mmap = sock_no_mmap,
1108 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001109#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001110 .compat_setsockopt = compat_sock_common_setsockopt,
1111 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001112#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001113};
1114
1115static struct inet_protosw dccp_v6_protosw = {
1116 .type = SOCK_DCCP,
1117 .protocol = IPPROTO_DCCP,
1118 .prot = &dccp_v6_prot,
1119 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001120 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001121};
1122
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001123static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001124{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001125 if (dccp_hashinfo.bhash == NULL)
1126 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001127
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001128 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1129 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001130}
1131
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001132static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001133{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001134 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001135}
1136
1137static struct pernet_operations dccp_v6_ops = {
1138 .init = dccp_v6_init_net,
1139 .exit = dccp_v6_exit_net,
1140};
1141
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001142static int __init dccp_v6_init(void)
1143{
1144 int err = proto_register(&dccp_v6_prot, 1);
1145
1146 if (err != 0)
1147 goto out;
1148
1149 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1150 if (err != 0)
1151 goto out_unregister_proto;
1152
1153 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001154
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001155 err = register_pernet_subsys(&dccp_v6_ops);
1156 if (err != 0)
1157 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001158out:
1159 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001160
1161out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001162 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1163 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001164out_unregister_proto:
1165 proto_unregister(&dccp_v6_prot);
1166 goto out;
1167}
1168
1169static void __exit dccp_v6_exit(void)
1170{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001171 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001172 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1173 inet6_unregister_protosw(&dccp_v6_protosw);
1174 proto_unregister(&dccp_v6_prot);
1175}
1176
1177module_init(dccp_v6_init);
1178module_exit(dccp_v6_exit);
1179
1180/*
1181 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1182 * values directly, Also cover the case where the protocol is not specified,
1183 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1184 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001185MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1186MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001187MODULE_LICENSE("GPL");
1188MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1189MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");