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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);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->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
144 if (sock_owned_by_user(sk))
145 goto out;
146 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
147 goto out;
148
David S. Miller35ad9b92012-07-16 03:44:56 -0700149 dst = inet6_csk_update_pmtu(sk, ntohl(info));
150 if (!dst)
151 goto out;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800152
David S. Miller35ad9b92012-07-16 03:44:56 -0700153 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800154 dccp_sync_mss(sk, dst_mtu(dst));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800155 goto out;
156 }
157
158 icmpv6_err_convert(type, code, &err);
159
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800160 /* Might be for an request_sock */
161 switch (sk->sk_state) {
162 struct request_sock *req, **prev;
163 case DCCP_LISTEN:
164 if (sock_owned_by_user(sk))
165 goto out;
166
167 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
168 &hdr->daddr, &hdr->saddr,
169 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800170 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800171 goto out;
172
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800173 /*
174 * ICMPs are not backlogged, hence we cannot get an established
175 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800176 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700177 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800178
Samuel Jerof541fb72012-02-26 18:22:02 -0700179 if (!between48(seq, dccp_rsk(req)->dreq_iss,
180 dccp_rsk(req)->dreq_gss)) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700181 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800182 goto out;
183 }
184
185 inet_csk_reqsk_queue_drop(sk, req, prev);
186 goto out;
187
188 case DCCP_REQUESTING:
189 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800190 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800191 if (!sock_owned_by_user(sk)) {
192 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
193 sk->sk_err = err;
194 /*
195 * Wake people up to see the error
196 * (see connect in sock.c)
197 */
198 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800199 dccp_done(sk);
200 } else
201 sk->sk_err_soft = err;
202 goto out;
203 }
204
205 if (!sock_owned_by_user(sk) && np->recverr) {
206 sk->sk_err = err;
207 sk->sk_error_report(sk);
208 } else
209 sk->sk_err_soft = err;
210
211out:
212 bh_unlock_sock(sk);
213 sock_put(sk);
214}
215
216
Christoph Paasch1a2c6182013-03-17 08:23:34 +0000217static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800218{
219 struct inet6_request_sock *ireq6 = inet6_rsk(req);
220 struct ipv6_pinfo *np = inet6_sk(sk);
221 struct sk_buff *skb;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000222 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500223 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800224 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800225 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800226
David S. Miller4c9483b2011-03-12 16:22:43 -0500227 memset(&fl6, 0, sizeof(fl6));
228 fl6.flowi6_proto = IPPROTO_DCCP;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000229 fl6.daddr = ireq6->rmt_addr;
230 fl6.saddr = ireq6->loc_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500231 fl6.flowlabel = 0;
232 fl6.flowi6_oif = ireq6->iif;
David S. Miller1958b852011-03-12 16:36:19 -0500233 fl6.fl6_dport = inet_rsk(req)->rmt_port;
234 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500235 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800236
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800237
RongQing.Li0979e462012-07-01 17:19:00 +0000238 final_p = fl6_update_dst(&fl6, np->opt, &final);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800239
David S. Miller4c9483b2011-03-12 16:22:43 -0500240 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800241 if (IS_ERR(dst)) {
242 err = PTR_ERR(dst);
243 dst = NULL;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800244 goto done;
David S. Miller68d0c6d2011-03-01 13:19:07 -0800245 }
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800246
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800247 skb = dccp_make_response(sk, dst, req);
248 if (skb != NULL) {
249 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800250
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200251 dh->dccph_checksum = dccp_v6_csum_finish(skb,
252 &ireq6->loc_addr,
253 &ireq6->rmt_addr);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000254 fl6.daddr = ireq6->rmt_addr;
RongQing.Li0979e462012-07-01 17:19:00 +0000255 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200256 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800257 }
258
259done:
David S. Miller0cbd7822006-01-31 17:53:37 -0800260 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800261 return err;
262}
263
264static void dccp_v6_reqsk_destructor(struct request_sock *req)
265{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800266 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800267 if (inet6_rsk(req)->pktopts != NULL)
268 kfree_skb(inet6_rsk(req)->pktopts);
269}
270
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800271static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800272{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000273 const struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800274 struct sk_buff *skb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500275 struct flowi6 fl6;
Eric Dumazetadf30902009-06-02 05:19:30 +0000276 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700277 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000278 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800279
Gerrit Renkere356d372007-09-26 14:35:19 -0300280 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800281 return;
282
283 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800284 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800285
Pavel Emelyanov02047742008-04-13 22:32:25 -0700286 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800287 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200288 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800289
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700290 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300291 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
292 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200293
David S. Miller4c9483b2011-03-12 16:22:43 -0500294 memset(&fl6, 0, sizeof(fl6));
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000295 fl6.daddr = rxip6h->saddr;
296 fl6.saddr = rxip6h->daddr;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200297
David S. Miller4c9483b2011-03-12 16:22:43 -0500298 fl6.flowi6_proto = IPPROTO_DCCP;
299 fl6.flowi6_oif = inet6_iif(rxskb);
David S. Miller1958b852011-03-12 16:36:19 -0500300 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
301 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500302 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800303
304 /* sk = NULL, but it is safe for now. RST socket required. */
David S. Miller4c9483b2011-03-12 16:22:43 -0500305 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800306 if (!IS_ERR(dst)) {
307 skb_dst_set(skb, dst);
Eric Dumazetb903d322011-10-27 00:44:35 -0400308 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800309 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
310 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
311 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800312 }
313
314 kfree_skb(skb);
315}
316
Gerrit Renker73c9e022006-11-10 13:01:31 -0200317static struct request_sock_ops dccp6_request_sock_ops = {
318 .family = AF_INET6,
319 .obj_size = sizeof(struct dccp6_request_sock),
320 .rtx_syn_ack = dccp_v6_send_response,
321 .send_ack = dccp_reqsk_send_ack,
322 .destructor = dccp_v6_reqsk_destructor,
323 .send_reset = dccp_v6_ctl_send_reset,
Eric Dumazetc72e1182012-04-12 22:16:05 +0000324 .syn_ack_timeout = dccp_syn_ack_timeout,
Gerrit Renker73c9e022006-11-10 13:01:31 -0200325};
326
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800327static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
328{
329 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700330 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800331 struct sock *nsk;
332 struct request_sock **prev;
333 /* Find possible connection requests. */
334 struct request_sock *req = inet6_csk_search_req(sk, &prev,
335 dh->dccph_sport,
336 &iph->saddr,
337 &iph->daddr,
338 inet6_iif(skb));
339 if (req != NULL)
340 return dccp_check_req(sk, skb, req, prev);
341
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700342 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800343 &iph->saddr, dh->dccph_sport,
344 &iph->daddr, ntohs(dh->dccph_dport),
345 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800346 if (nsk != NULL) {
347 if (nsk->sk_state != DCCP_TIME_WAIT) {
348 bh_lock_sock(nsk);
349 return nsk;
350 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700351 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800352 return NULL;
353 }
354
355 return sk;
356}
357
358static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
359{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800360 struct request_sock *req;
361 struct dccp_request_sock *dreq;
362 struct inet6_request_sock *ireq6;
363 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200364 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800365 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800366
367 if (skb->protocol == htons(ETH_P_IP))
368 return dccp_v4_conn_request(sk, skb);
369
370 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700371 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800372
373 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700374 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800375 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200376 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800377 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800378 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800379 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700380 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800381 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800382 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800383
384 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
385 goto drop;
386
Gerrit Renker82709532006-10-11 16:26:54 +0100387 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800388 if (req == NULL)
389 goto drop;
390
Gerrit Renkerac757732008-11-04 23:55:49 -0800391 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
392 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800393
Gerrit Renker8b819412007-12-13 12:29:24 -0200394 dreq = dccp_rsk(req);
395 if (dccp_parse_options(sk, dreq, skb))
396 goto drop_and_free;
397
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700398 if (security_inet_conn_request(sk, skb, req))
399 goto drop_and_free;
400
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800401 ireq6 = inet6_rsk(req);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000402 ireq6->rmt_addr = ipv6_hdr(skb)->saddr;
403 ireq6->loc_addr = ipv6_hdr(skb)->daddr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800404
405 if (ipv6_opt_accepted(sk, skb) ||
406 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
407 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
408 atomic_inc(&skb->users);
409 ireq6->pktopts = skb;
410 }
411 ireq6->iif = sk->sk_bound_dev_if;
412
413 /* So that link locals have meaning */
414 if (!sk->sk_bound_dev_if &&
415 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
416 ireq6->iif = inet6_iif(skb);
417
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800418 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800419 * Step 3: Process LISTEN state
420 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200421 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800422 *
Samuel Jerof541fb72012-02-26 18:22:02 -0700423 * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800425 dreq->dreq_isr = dcb->dccpd_seq;
Samuel Jerof541fb72012-02-26 18:22:02 -0700426 dreq->dreq_gsr = dreq->dreq_isr;
Gerrit Renker865e9022006-11-13 13:31:50 -0200427 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Samuel Jerof541fb72012-02-26 18:22:02 -0700428 dreq->dreq_gss = dreq->dreq_iss;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800429 dreq->dreq_service = service;
430
Christoph Paasch1a2c6182013-03-17 08:23:34 +0000431 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800432 goto drop_and_free;
433
434 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
435 return 0;
436
437drop_and_free:
438 reqsk_free(req);
439drop:
440 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800441 return -1;
442}
443
444static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
445 struct sk_buff *skb,
446 struct request_sock *req,
447 struct dst_entry *dst)
448{
449 struct inet6_request_sock *ireq6 = inet6_rsk(req);
450 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
451 struct inet_sock *newinet;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800452 struct dccp6_sock *newdp6;
453 struct sock *newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800454
455 if (skb->protocol == htons(ETH_P_IP)) {
456 /*
457 * v6 mapped
458 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800459 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800460 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800461 return NULL;
462
463 newdp6 = (struct dccp6_sock *)newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800464 newinet = inet_sk(newsk);
465 newinet->pinet6 = &newdp6->inet6;
466 newnp = inet6_sk(newsk);
467
468 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
469
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000470 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800471
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000472 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800473
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000474 newnp->rcv_saddr = newnp->saddr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800475
476 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
477 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
478 newnp->pktoptions = NULL;
479 newnp->opt = NULL;
480 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700481 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800482
483 /*
484 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
485 * here, dccp_create_openreq_child now does this for us, see the comment in
486 * that function for the gory details. -acme
487 */
488
489 /* It is tricky place. Until this moment IPv4 tcp
490 worked with IPv6 icsk.icsk_af_ops.
491 Sync it now.
492 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800493 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800494
495 return newsk;
496 }
497
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800498
499 if (sk_acceptq_is_full(sk))
500 goto out_overflow;
501
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800502 if (dst == NULL) {
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000503 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500504 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800505
David S. Miller4c9483b2011-03-12 16:22:43 -0500506 memset(&fl6, 0, sizeof(fl6));
507 fl6.flowi6_proto = IPPROTO_DCCP;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000508 fl6.daddr = ireq6->rmt_addr;
RongQing.Li0979e462012-07-01 17:19:00 +0000509 final_p = fl6_update_dst(&fl6, np->opt, &final);
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000510 fl6.saddr = ireq6->loc_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500511 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500512 fl6.fl6_dport = inet_rsk(req)->rmt_port;
513 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500514 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800515
David S. Miller4c9483b2011-03-12 16:22:43 -0500516 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800517 if (IS_ERR(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800518 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800519 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800520
521 newsk = dccp_create_openreq_child(sk, req, skb);
522 if (newsk == NULL)
Balazs Scheidler093d2822010-10-21 13:06:43 +0200523 goto out_nonewsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800524
525 /*
526 * No need to charge this sock to the relevant IPv6 refcnt debug socks
527 * count here, dccp_create_openreq_child now does this for us, see the
528 * comment in that function for the gory details. -acme
529 */
530
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700531 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800532 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
533 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800534 newdp6 = (struct dccp6_sock *)newsk;
535 newinet = inet_sk(newsk);
536 newinet->pinet6 = &newdp6->inet6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800537 newnp = inet6_sk(newsk);
538
539 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
540
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000541 newnp->daddr = ireq6->rmt_addr;
542 newnp->saddr = ireq6->loc_addr;
543 newnp->rcv_saddr = ireq6->loc_addr;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800544 newsk->sk_bound_dev_if = ireq6->iif;
545
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800546 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800547
548 First: no IPv4 options.
549 */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000550 newinet->inet_opt = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800551
552 /* Clone RX bits */
553 newnp->rxopt.all = np->rxopt.all;
554
555 /* Clone pktoptions received with SYN */
556 newnp->pktoptions = NULL;
557 if (ireq6->pktopts != NULL) {
558 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
Eric Dumazet7604adc2012-04-19 02:24:48 +0000559 consume_skb(ireq6->pktopts);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800560 ireq6->pktopts = NULL;
561 if (newnp->pktoptions)
562 skb_set_owner_r(newnp->pktoptions, newsk);
563 }
564 newnp->opt = NULL;
565 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700566 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800567
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800568 /*
569 * Clone native IPv6 options from listening socket (if any)
570 *
571 * Yes, keeping reference count would be much more clever, but we make
572 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800573 */
RongQing.Li0979e462012-07-01 17:19:00 +0000574 if (np->opt != NULL)
575 newnp->opt = ipv6_dup_options(newsk, np->opt);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800576
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800577 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800578 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800579 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
580 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800581
582 dccp_sync_mss(newsk, dst_mtu(dst));
583
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000584 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
585 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800586
Balazs Scheidler093d2822010-10-21 13:06:43 +0200587 if (__inet_inherit_port(sk, newsk) < 0) {
Christoph Paasche337e242012-12-14 04:07:58 +0000588 inet_csk_prepare_forced_close(newsk);
589 dccp_done(newsk);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200590 goto out;
591 }
Eric Dumazet9327f702009-12-04 03:46:54 +0000592 __inet6_hash(newsk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800593
594 return newsk;
595
596out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700597 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200598out_nonewsk:
599 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800600out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700601 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800602 return NULL;
603}
604
605/* The socket must have it's spinlock held when we get
606 * here.
607 *
608 * We have a potential double-lock case here, so even when
609 * doing backlog processing we use the BH locking scheme.
610 * This is because we cannot sleep with the original spinlock
611 * held.
612 */
613static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
614{
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct sk_buff *opt_skb = NULL;
617
618 /* Imagine: socket is IPv6. IPv4 packet arrives,
619 goes to IPv4 receive handler and backlogged.
620 From backlog it always goes here. Kerboom...
621 Fortunately, dccp_rcv_established and rcv_established
622 handle them correctly, but it is not case with
623 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
624 */
625
626 if (skb->protocol == htons(ETH_P_IP))
627 return dccp_v4_do_rcv(sk, skb);
628
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700629 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800630 goto discard;
631
632 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800633 * socket locking is here for SMP purposes as backlog rcv is currently
634 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800635 */
636
637 /* Do Stevens' IPV6_PKTOPTIONS.
638
639 Yes, guys, it is the only place in our code, where we
640 may make it not affecting IPv4.
641 The rest of code is protocol independent,
642 and I do not like idea to uglify IPv4.
643
644 Actually, all the idea behind IPV6_PKTOPTIONS
645 looks not very well thought. For now we latch
646 options, received in the last packet, enqueued
647 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900648 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800649 */
650 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200651 /*
652 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
653 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
654 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800655 opt_skb = skb_clone(skb, GFP_ATOMIC);
656
657 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
658 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
659 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700660 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200661 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700662 __kfree_skb(opt_skb);
663 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800664 return 0;
665 }
666
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200667 /*
668 * Step 3: Process LISTEN state
669 * If S.state == LISTEN,
670 * If P.type == Request or P contains a valid Init Cookie option,
671 * (* Must scan the packet's options to check for Init
672 * Cookies. Only Init Cookies are processed here,
673 * however; other options are processed in Step 8. This
674 * scan need only be performed if the endpoint uses Init
675 * Cookies *)
676 * (* Generate a new socket and switch to that socket *)
677 * Set S := new socket for this port pair
678 * S.state = RESPOND
679 * Choose S.ISS (initial seqno) or set from Init Cookies
680 * Initialize S.GAR := S.ISS
681 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
682 * Continue with S.state == RESPOND
683 * (* A Response packet will be generated in Step 11 *)
684 * Otherwise,
685 * Generate Reset(No Connection) unless P.type == Reset
686 * Drop packet and return
687 *
688 * NOTE: the check for the packet types is done in
689 * dccp_rcv_state_process
690 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800691 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800692 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800693
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800694 if (nsk == NULL)
695 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800696 /*
697 * Queue it on the new socket if the new socket is active,
698 * otherwise we just shortcircuit this and continue with
699 * the new socket..
700 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200701 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800702 if (dccp_child_process(sk, nsk, skb))
703 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800704 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800705 __kfree_skb(opt_skb);
706 return 0;
707 }
708 }
709
710 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
711 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700712 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200713 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700714 __kfree_skb(opt_skb);
715 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800716 return 0;
717
718reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800719 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800720discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800721 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800722 __kfree_skb(opt_skb);
723 kfree_skb(skb);
724 return 0;
725}
726
Herbert Xue5bbef22007-10-15 12:50:28 -0700727static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800728{
729 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800730 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200731 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800732
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200733 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800734
735 if (dccp_invalid_packet(skb))
736 goto discard_it;
737
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200738 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700739 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
740 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200741 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200742 goto discard_it;
743 }
744
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800745 dh = dccp_hdr(skb);
746
Gerrit Renkerfde20102007-10-24 10:12:09 -0200747 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800748 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
749
750 if (dccp_packet_without_ack(skb))
751 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
752 else
753 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
754
755 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200756 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700757 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
758 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800759 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800760 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200761 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800762 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200763 if (sk == NULL) {
764 dccp_pr_debug("failed to look up flow ID in table and "
765 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800766 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200767 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800768
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800769 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800770 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200771 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800772 * Generate Reset(No Connection) unless P.type == Reset
773 * Drop packet and return
774 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200775 if (sk->sk_state == DCCP_TIME_WAIT) {
776 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
777 inet_twsk_put(inet_twsk(sk));
778 goto no_dccp_socket;
779 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800780
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200781 /*
782 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200783 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
784 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200785 */
786 min_cov = dccp_sk(sk)->dccps_pcrlen;
787 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
788 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
789 dh->dccph_cscov, min_cov);
790 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
791 goto discard_and_relse;
792 }
793
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800794 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
795 goto discard_and_relse;
796
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200797 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800798
799no_dccp_socket:
800 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
801 goto discard_it;
802 /*
803 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200804 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800805 * Generate Reset(No Connection) unless P.type == Reset
806 * Drop packet and return
807 */
808 if (dh->dccph_type != DCCP_PKT_RESET) {
809 DCCP_SKB_CB(skb)->dccpd_reset_code =
810 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800811 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800812 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200813
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800814discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800815 kfree_skb(skb);
816 return 0;
817
818discard_and_relse:
819 sock_put(sk);
820 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800821}
822
Gerrit Renker73c9e022006-11-10 13:01:31 -0200823static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
824 int addr_len)
825{
826 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
827 struct inet_connection_sock *icsk = inet_csk(sk);
828 struct inet_sock *inet = inet_sk(sk);
829 struct ipv6_pinfo *np = inet6_sk(sk);
830 struct dccp_sock *dp = dccp_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000831 struct in6_addr *saddr = NULL, *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500832 struct flowi6 fl6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200833 struct dst_entry *dst;
834 int addr_type;
835 int err;
836
837 dp->dccps_role = DCCP_ROLE_CLIENT;
838
839 if (addr_len < SIN6_LEN_RFC2133)
840 return -EINVAL;
841
842 if (usin->sin6_family != AF_INET6)
843 return -EAFNOSUPPORT;
844
David S. Miller4c9483b2011-03-12 16:22:43 -0500845 memset(&fl6, 0, sizeof(fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200846
847 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500848 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
849 IP6_ECN_flow_init(fl6.flowlabel);
850 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
Gerrit Renker73c9e022006-11-10 13:01:31 -0200851 struct ip6_flowlabel *flowlabel;
David S. Miller4c9483b2011-03-12 16:22:43 -0500852 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200853 if (flowlabel == NULL)
854 return -EINVAL;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000855 usin->sin6_addr = flowlabel->dst;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200856 fl6_sock_release(flowlabel);
857 }
858 }
859 /*
860 * connect() to INADDR_ANY means loopback (BSD'ism).
861 */
862 if (ipv6_addr_any(&usin->sin6_addr))
863 usin->sin6_addr.s6_addr[15] = 1;
864
865 addr_type = ipv6_addr_type(&usin->sin6_addr);
866
867 if (addr_type & IPV6_ADDR_MULTICAST)
868 return -ENETUNREACH;
869
870 if (addr_type & IPV6_ADDR_LINKLOCAL) {
871 if (addr_len >= sizeof(struct sockaddr_in6) &&
872 usin->sin6_scope_id) {
873 /* If interface is set while binding, indices
874 * must coincide.
875 */
876 if (sk->sk_bound_dev_if &&
877 sk->sk_bound_dev_if != usin->sin6_scope_id)
878 return -EINVAL;
879
880 sk->sk_bound_dev_if = usin->sin6_scope_id;
881 }
882
883 /* Connect to link-local address requires an interface */
884 if (!sk->sk_bound_dev_if)
885 return -EINVAL;
886 }
887
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000888 np->daddr = usin->sin6_addr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500889 np->flow_label = fl6.flowlabel;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200890
891 /*
892 * DCCP over IPv4
893 */
894 if (addr_type == IPV6_ADDR_MAPPED) {
895 u32 exthdrlen = icsk->icsk_ext_hdr_len;
896 struct sockaddr_in sin;
897
898 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
899
900 if (__ipv6_only_sock(sk))
901 return -ENETUNREACH;
902
903 sin.sin_family = AF_INET;
904 sin.sin_port = usin->sin6_port;
905 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
906
907 icsk->icsk_af_ops = &dccp_ipv6_mapped;
908 sk->sk_backlog_rcv = dccp_v4_do_rcv;
909
910 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
911 if (err) {
912 icsk->icsk_ext_hdr_len = exthdrlen;
913 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
914 sk->sk_backlog_rcv = dccp_v6_do_rcv;
915 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200916 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000917 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
918 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200919
920 return err;
921 }
922
923 if (!ipv6_addr_any(&np->rcv_saddr))
924 saddr = &np->rcv_saddr;
925
David S. Miller4c9483b2011-03-12 16:22:43 -0500926 fl6.flowi6_proto = IPPROTO_DCCP;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000927 fl6.daddr = np->daddr;
928 fl6.saddr = saddr ? *saddr : np->saddr;
David S. Miller4c9483b2011-03-12 16:22:43 -0500929 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500930 fl6.fl6_dport = usin->sin6_port;
931 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500932 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200933
David S. Miller4c9483b2011-03-12 16:22:43 -0500934 final_p = fl6_update_dst(&fl6, np->opt, &final);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200935
David S. Miller4c9483b2011-03-12 16:22:43 -0500936 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800937 if (IS_ERR(dst)) {
938 err = PTR_ERR(dst);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200939 goto failure;
David S. Miller14e50e52007-05-24 18:17:54 -0700940 }
Gerrit Renker73c9e022006-11-10 13:01:31 -0200941
942 if (saddr == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500943 saddr = &fl6.saddr;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000944 np->rcv_saddr = *saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200945 }
946
947 /* set the source address */
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000948 np->saddr = *saddr;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000949 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200950
951 __ip6_dst_store(sk, dst, NULL, NULL);
952
953 icsk->icsk_ext_hdr_len = 0;
954 if (np->opt != NULL)
955 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
956 np->opt->opt_nflen);
957
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000958 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200959
960 dccp_set_state(sk, DCCP_REQUESTING);
961 err = inet6_hash_connect(&dccp_death_row, sk);
962 if (err)
963 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -0200964
965 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
966 np->daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000967 inet->inet_sport,
968 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200969 err = dccp_connect(sk);
970 if (err)
971 goto late_failure;
972
973 return 0;
974
975late_failure:
976 dccp_set_state(sk, DCCP_CLOSED);
977 __sk_dst_reset(sk);
978failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000979 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200980 sk->sk_route_caps = 0;
981 return err;
982}
983
Stephen Hemminger3b401a82009-09-01 19:25:04 +0000984static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800985 .queue_xmit = inet6_csk_xmit,
986 .send_check = dccp_v6_send_check,
987 .rebuild_header = inet6_sk_rebuild_header,
988 .conn_request = dccp_v6_conn_request,
989 .syn_recv_sock = dccp_v6_request_recv_sock,
990 .net_header_len = sizeof(struct ipv6hdr),
991 .setsockopt = ipv6_setsockopt,
992 .getsockopt = ipv6_getsockopt,
993 .addr2sockaddr = inet6_csk_addr2sockaddr,
994 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800995 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800996#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800997 .compat_setsockopt = compat_ipv6_setsockopt,
998 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800999#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001000};
1001
1002/*
1003 * DCCP over IPv4 via INET6 API
1004 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001005static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001006 .queue_xmit = ip_queue_xmit,
1007 .send_check = dccp_v4_send_check,
1008 .rebuild_header = inet_sk_rebuild_header,
1009 .conn_request = dccp_v6_conn_request,
1010 .syn_recv_sock = dccp_v6_request_recv_sock,
1011 .net_header_len = sizeof(struct iphdr),
1012 .setsockopt = ipv6_setsockopt,
1013 .getsockopt = ipv6_getsockopt,
1014 .addr2sockaddr = inet6_csk_addr2sockaddr,
1015 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001016#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001017 .compat_setsockopt = compat_ipv6_setsockopt,
1018 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001019#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001020};
1021
1022/* NOTE: A lot of things set to zero explicitly by call to
1023 * sk_alloc() so need not be done here.
1024 */
1025static int dccp_v6_init_sock(struct sock *sk)
1026{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001027 static __u8 dccp_v6_ctl_sock_initialized;
1028 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001029
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001030 if (err == 0) {
1031 if (unlikely(!dccp_v6_ctl_sock_initialized))
1032 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001033 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001034 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001035
1036 return err;
1037}
1038
Brian Haley7d06b2e2008-06-14 17:04:49 -07001039static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001040{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001041 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001042 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001043}
1044
Gerrit Renker73c9e022006-11-10 13:01:31 -02001045static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1046 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1047};
1048
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001049static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001050 .name = "DCCPv6",
1051 .owner = THIS_MODULE,
1052 .close = dccp_close,
1053 .connect = dccp_v6_connect,
1054 .disconnect = dccp_disconnect,
1055 .ioctl = dccp_ioctl,
1056 .init = dccp_v6_init_sock,
1057 .setsockopt = dccp_setsockopt,
1058 .getsockopt = dccp_getsockopt,
1059 .sendmsg = dccp_sendmsg,
1060 .recvmsg = dccp_recvmsg,
1061 .backlog_rcv = dccp_v6_do_rcv,
1062 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001063 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001064 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001065 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001066 .shutdown = dccp_shutdown,
1067 .destroy = dccp_v6_destroy_sock,
1068 .orphan_count = &dccp_orphan_count,
1069 .max_header = MAX_DCCP_HEADER,
1070 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001071 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001072 .rsk_prot = &dccp6_request_sock_ops,
1073 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001074 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001075#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001076 .compat_setsockopt = compat_dccp_setsockopt,
1077 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001078#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001079};
1080
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001081static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001082 .handler = dccp_v6_rcv,
1083 .err_handler = dccp_v6_err,
1084 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001085};
1086
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001087static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001088 .family = PF_INET6,
1089 .owner = THIS_MODULE,
1090 .release = inet6_release,
1091 .bind = inet6_bind,
1092 .connect = inet_stream_connect,
1093 .socketpair = sock_no_socketpair,
1094 .accept = inet_accept,
1095 .getname = inet6_getname,
1096 .poll = dccp_poll,
1097 .ioctl = inet6_ioctl,
1098 .listen = inet_dccp_listen,
1099 .shutdown = inet_shutdown,
1100 .setsockopt = sock_common_setsockopt,
1101 .getsockopt = sock_common_getsockopt,
1102 .sendmsg = inet_sendmsg,
1103 .recvmsg = sock_common_recvmsg,
1104 .mmap = sock_no_mmap,
1105 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001106#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001107 .compat_setsockopt = compat_sock_common_setsockopt,
1108 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001109#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001110};
1111
1112static struct inet_protosw dccp_v6_protosw = {
1113 .type = SOCK_DCCP,
1114 .protocol = IPPROTO_DCCP,
1115 .prot = &dccp_v6_prot,
1116 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001117 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001118};
1119
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001120static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001121{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001122 if (dccp_hashinfo.bhash == NULL)
1123 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001124
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001125 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1126 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001127}
1128
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001129static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001130{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001131 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001132}
1133
1134static struct pernet_operations dccp_v6_ops = {
1135 .init = dccp_v6_init_net,
1136 .exit = dccp_v6_exit_net,
1137};
1138
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001139static int __init dccp_v6_init(void)
1140{
1141 int err = proto_register(&dccp_v6_prot, 1);
1142
1143 if (err != 0)
1144 goto out;
1145
1146 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1147 if (err != 0)
1148 goto out_unregister_proto;
1149
1150 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001151
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001152 err = register_pernet_subsys(&dccp_v6_ops);
1153 if (err != 0)
1154 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001155out:
1156 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001157
1158out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001159 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1160 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001161out_unregister_proto:
1162 proto_unregister(&dccp_v6_prot);
1163 goto out;
1164}
1165
1166static void __exit dccp_v6_exit(void)
1167{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001168 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001169 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1170 inet6_unregister_protosw(&dccp_v6_protosw);
1171 proto_unregister(&dccp_v6_prot);
1172}
1173
1174module_init(dccp_v6_init);
1175module_exit(dccp_v6_exit);
1176
1177/*
1178 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1179 * values directly, Also cover the case where the protocol is not specified,
1180 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1181 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001182MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1183MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001184MODULE_LICENSE("GPL");
1185MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1186MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");