blob: 17ee85ce148dee3ac5e12e572a61f38dcfa8d381 [file] [log] [blame]
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001/*
2 * DCCP over IPv6
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08003 * Linux INET6 implementation
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08004 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080015#include <linux/module.h>
16#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080018#include <linux/xfrm.h>
19
20#include <net/addrconf.h>
21#include <net/inet_common.h>
22#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080024#include <net/inet6_connection_sock.h>
25#include <net/inet6_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/ipv6.h>
28#include <net/protocol.h>
29#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080030#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080031#include <net/xfrm.h>
David S. Miller6e5714e2011-08-03 20:50:44 -070032#include <net/secure_seq.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080033
34#include "dccp.h"
35#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070036#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080037
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070038/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080039
Stephen Hemminger3b401a82009-09-01 19:25:04 +000040static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
41static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080042
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080043static void dccp_v6_hash(struct sock *sk)
44{
45 if (sk->sk_state != DCCP_CLOSED) {
46 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080047 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080048 return;
49 }
50 local_bh_disable();
Eric Dumazet9327f702009-12-04 03:46:54 +000051 __inet6_hash(sk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080052 local_bh_enable();
53 }
54}
55
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020056/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080057static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Eric Dumazetb71d1d42011-04-22 04:53:02 +000058 const struct in6_addr *saddr,
59 const struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080060{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020061 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
62}
63
Herbert Xubb296242010-04-11 02:15:55 +000064static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020065{
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
68
69 dccp_csum_outgoing(skb);
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
133 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800134 struct dst_entry *dst = NULL;
135
136 if (sock_owned_by_user(sk))
137 goto out;
138 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
139 goto out;
140
141 /* icmp should have updated the destination cache entry */
142 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800143 if (dst == NULL) {
144 struct inet_sock *inet = inet_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500145 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800146
147 /* BUGGG_FUTURE: Again, it is not clear how
148 to handle rthdr case. Ignore this complexity
149 for now.
150 */
David S. Miller4c9483b2011-03-12 16:22:43 -0500151 memset(&fl6, 0, sizeof(fl6));
152 fl6.flowi6_proto = IPPROTO_DCCP;
153 ipv6_addr_copy(&fl6.daddr, &np->daddr);
154 ipv6_addr_copy(&fl6.saddr, &np->saddr);
155 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500156 fl6.fl6_dport = inet->inet_dport;
157 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500158 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800159
David S. Miller4c9483b2011-03-12 16:22:43 -0500160 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800161 if (IS_ERR(dst)) {
162 sk->sk_err_soft = -PTR_ERR(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800163 goto out;
164 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800165 } else
166 dst_hold(dst);
167
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800168 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800169 dccp_sync_mss(sk, dst_mtu(dst));
170 } /* else let the usual retransmit timer handle it */
171 dst_release(dst);
172 goto out;
173 }
174
175 icmpv6_err_convert(type, code, &err);
176
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800177 /* Might be for an request_sock */
178 switch (sk->sk_state) {
179 struct request_sock *req, **prev;
180 case DCCP_LISTEN:
181 if (sock_owned_by_user(sk))
182 goto out;
183
184 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
185 &hdr->daddr, &hdr->saddr,
186 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800187 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800188 goto out;
189
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800190 /*
191 * ICMPs are not backlogged, hence we cannot get an established
192 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800193 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700194 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800195
196 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700197 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800198 goto out;
199 }
200
201 inet_csk_reqsk_queue_drop(sk, req, prev);
202 goto out;
203
204 case DCCP_REQUESTING:
205 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800206 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800207 if (!sock_owned_by_user(sk)) {
208 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
209 sk->sk_err = err;
210 /*
211 * Wake people up to see the error
212 * (see connect in sock.c)
213 */
214 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800215 dccp_done(sk);
216 } else
217 sk->sk_err_soft = err;
218 goto out;
219 }
220
221 if (!sock_owned_by_user(sk) && np->recverr) {
222 sk->sk_err = err;
223 sk->sk_error_report(sk);
224 } else
225 sk->sk_err_soft = err;
226
227out:
228 bh_unlock_sock(sk);
229 sock_put(sk);
230}
231
232
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000233static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
234 struct request_values *rv_unused)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800235{
236 struct inet6_request_sock *ireq6 = inet6_rsk(req);
237 struct ipv6_pinfo *np = inet6_sk(sk);
238 struct sk_buff *skb;
239 struct ipv6_txoptions *opt = NULL;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000240 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500241 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800242 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800243 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800244
David S. Miller4c9483b2011-03-12 16:22:43 -0500245 memset(&fl6, 0, sizeof(fl6));
246 fl6.flowi6_proto = IPPROTO_DCCP;
247 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
248 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
249 fl6.flowlabel = 0;
250 fl6.flowi6_oif = ireq6->iif;
David S. Miller1958b852011-03-12 16:36:19 -0500251 fl6.fl6_dport = inet_rsk(req)->rmt_port;
252 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500253 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800254
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800255 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800256
David S. Miller4c9483b2011-03-12 16:22:43 -0500257 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800258
David S. Miller4c9483b2011-03-12 16:22:43 -0500259 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800260 if (IS_ERR(dst)) {
261 err = PTR_ERR(dst);
262 dst = NULL;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800263 goto done;
David S. Miller68d0c6d2011-03-01 13:19:07 -0800264 }
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800265
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800266 skb = dccp_make_response(sk, dst, req);
267 if (skb != NULL) {
268 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800269
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200270 dh->dccph_checksum = dccp_v6_csum_finish(skb,
271 &ireq6->loc_addr,
272 &ireq6->rmt_addr);
David S. Miller4c9483b2011-03-12 16:22:43 -0500273 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
Eric Dumazetb903d322011-10-27 00:44:35 -0400274 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200275 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800276 }
277
278done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800279 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800280 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800281 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800282 return err;
283}
284
285static void dccp_v6_reqsk_destructor(struct request_sock *req)
286{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800287 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800288 if (inet6_rsk(req)->pktopts != NULL)
289 kfree_skb(inet6_rsk(req)->pktopts);
290}
291
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800292static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800293{
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000294 const struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800295 struct sk_buff *skb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500296 struct flowi6 fl6;
Eric Dumazetadf30902009-06-02 05:19:30 +0000297 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700298 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000299 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800300
Gerrit Renkere356d372007-09-26 14:35:19 -0300301 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800302 return;
303
304 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800305 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800306
Pavel Emelyanov02047742008-04-13 22:32:25 -0700307 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800308 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200309 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800310
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700311 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300312 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
313 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200314
David S. Miller4c9483b2011-03-12 16:22:43 -0500315 memset(&fl6, 0, sizeof(fl6));
316 ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
317 ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200318
David S. Miller4c9483b2011-03-12 16:22:43 -0500319 fl6.flowi6_proto = IPPROTO_DCCP;
320 fl6.flowi6_oif = inet6_iif(rxskb);
David S. Miller1958b852011-03-12 16:36:19 -0500321 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
322 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500323 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800324
325 /* sk = NULL, but it is safe for now. RST socket required. */
David S. Miller4c9483b2011-03-12 16:22:43 -0500326 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800327 if (!IS_ERR(dst)) {
328 skb_dst_set(skb, dst);
Eric Dumazetb903d322011-10-27 00:44:35 -0400329 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800330 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
331 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
332 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800333 }
334
335 kfree_skb(skb);
336}
337
Gerrit Renker73c9e022006-11-10 13:01:31 -0200338static struct request_sock_ops dccp6_request_sock_ops = {
339 .family = AF_INET6,
340 .obj_size = sizeof(struct dccp6_request_sock),
341 .rtx_syn_ack = dccp_v6_send_response,
342 .send_ack = dccp_reqsk_send_ack,
343 .destructor = dccp_v6_reqsk_destructor,
344 .send_reset = dccp_v6_ctl_send_reset,
345};
346
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800347static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
348{
349 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700350 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800351 struct sock *nsk;
352 struct request_sock **prev;
353 /* Find possible connection requests. */
354 struct request_sock *req = inet6_csk_search_req(sk, &prev,
355 dh->dccph_sport,
356 &iph->saddr,
357 &iph->daddr,
358 inet6_iif(skb));
359 if (req != NULL)
360 return dccp_check_req(sk, skb, req, prev);
361
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700362 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800363 &iph->saddr, dh->dccph_sport,
364 &iph->daddr, ntohs(dh->dccph_dport),
365 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800366 if (nsk != NULL) {
367 if (nsk->sk_state != DCCP_TIME_WAIT) {
368 bh_lock_sock(nsk);
369 return nsk;
370 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700371 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800372 return NULL;
373 }
374
375 return sk;
376}
377
378static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
379{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800380 struct request_sock *req;
381 struct dccp_request_sock *dreq;
382 struct inet6_request_sock *ireq6;
383 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200384 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800385 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800386
387 if (skb->protocol == htons(ETH_P_IP))
388 return dccp_v4_conn_request(sk, skb);
389
390 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700391 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800392
393 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700394 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800395 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200396 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800397 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800398 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800399 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700400 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800401 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800402 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800403
404 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
405 goto drop;
406
Gerrit Renker82709532006-10-11 16:26:54 +0100407 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800408 if (req == NULL)
409 goto drop;
410
Gerrit Renkerac757732008-11-04 23:55:49 -0800411 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
412 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800413
Gerrit Renker8b819412007-12-13 12:29:24 -0200414 dreq = dccp_rsk(req);
415 if (dccp_parse_options(sk, dreq, skb))
416 goto drop_and_free;
417
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700418 if (security_inet_conn_request(sk, skb, req))
419 goto drop_and_free;
420
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800421 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700422 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
423 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424
425 if (ipv6_opt_accepted(sk, skb) ||
426 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
427 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
428 atomic_inc(&skb->users);
429 ireq6->pktopts = skb;
430 }
431 ireq6->iif = sk->sk_bound_dev_if;
432
433 /* So that link locals have meaning */
434 if (!sk->sk_bound_dev_if &&
435 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
436 ireq6->iif = inet6_iif(skb);
437
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800438 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800439 * Step 3: Process LISTEN state
440 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200441 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800442 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200443 * In fact we defer setting S.GSR, S.SWL, S.SWH to
444 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800445 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800446 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200447 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800448 dreq->dreq_service = service;
449
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000450 if (dccp_v6_send_response(sk, req, NULL))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800451 goto drop_and_free;
452
453 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
454 return 0;
455
456drop_and_free:
457 reqsk_free(req);
458drop:
459 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800460 return -1;
461}
462
463static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
464 struct sk_buff *skb,
465 struct request_sock *req,
466 struct dst_entry *dst)
467{
468 struct inet6_request_sock *ireq6 = inet6_rsk(req);
469 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
470 struct inet_sock *newinet;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800471 struct dccp6_sock *newdp6;
472 struct sock *newsk;
473 struct ipv6_txoptions *opt;
474
475 if (skb->protocol == htons(ETH_P_IP)) {
476 /*
477 * v6 mapped
478 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800479 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800480 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800481 return NULL;
482
483 newdp6 = (struct dccp6_sock *)newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800484 newinet = inet_sk(newsk);
485 newinet->pinet6 = &newdp6->inet6;
486 newnp = inet6_sk(newsk);
487
488 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
489
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000490 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800491
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000492 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800493
494 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
495
496 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
497 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
498 newnp->pktoptions = NULL;
499 newnp->opt = NULL;
500 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700501 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800502
503 /*
504 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
505 * here, dccp_create_openreq_child now does this for us, see the comment in
506 * that function for the gory details. -acme
507 */
508
509 /* It is tricky place. Until this moment IPv4 tcp
510 worked with IPv6 icsk.icsk_af_ops.
511 Sync it now.
512 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800513 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800514
515 return newsk;
516 }
517
518 opt = np->opt;
519
520 if (sk_acceptq_is_full(sk))
521 goto out_overflow;
522
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800523 if (dst == NULL) {
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000524 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500525 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800526
David S. Miller4c9483b2011-03-12 16:22:43 -0500527 memset(&fl6, 0, sizeof(fl6));
528 fl6.flowi6_proto = IPPROTO_DCCP;
529 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
530 final_p = fl6_update_dst(&fl6, opt, &final);
531 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
532 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500533 fl6.fl6_dport = inet_rsk(req)->rmt_port;
534 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500535 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800536
David S. Miller4c9483b2011-03-12 16:22:43 -0500537 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800538 if (IS_ERR(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800539 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800540 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800541
542 newsk = dccp_create_openreq_child(sk, req, skb);
543 if (newsk == NULL)
Balazs Scheidler093d2822010-10-21 13:06:43 +0200544 goto out_nonewsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800545
546 /*
547 * No need to charge this sock to the relevant IPv6 refcnt debug socks
548 * count here, dccp_create_openreq_child now does this for us, see the
549 * comment in that function for the gory details. -acme
550 */
551
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700552 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800553 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
554 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800555 newdp6 = (struct dccp6_sock *)newsk;
556 newinet = inet_sk(newsk);
557 newinet->pinet6 = &newdp6->inet6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800558 newnp = inet6_sk(newsk);
559
560 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
561
562 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
563 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
564 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
565 newsk->sk_bound_dev_if = ireq6->iif;
566
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800567 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800568
569 First: no IPv4 options.
570 */
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000571 newinet->inet_opt = NULL;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800572
573 /* Clone RX bits */
574 newnp->rxopt.all = np->rxopt.all;
575
576 /* Clone pktoptions received with SYN */
577 newnp->pktoptions = NULL;
578 if (ireq6->pktopts != NULL) {
579 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
580 kfree_skb(ireq6->pktopts);
581 ireq6->pktopts = NULL;
582 if (newnp->pktoptions)
583 skb_set_owner_r(newnp->pktoptions, newsk);
584 }
585 newnp->opt = NULL;
586 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700587 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800588
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800589 /*
590 * Clone native IPv6 options from listening socket (if any)
591 *
592 * Yes, keeping reference count would be much more clever, but we make
593 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800594 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800595 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800596 newnp->opt = ipv6_dup_options(newsk, opt);
597 if (opt != np->opt)
598 sock_kfree_s(sk, opt, opt->tot_len);
599 }
600
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800601 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800602 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800603 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
604 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800605
606 dccp_sync_mss(newsk, dst_mtu(dst));
607
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000608 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
609 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800610
Balazs Scheidler093d2822010-10-21 13:06:43 +0200611 if (__inet_inherit_port(sk, newsk) < 0) {
612 sock_put(newsk);
613 goto out;
614 }
Eric Dumazet9327f702009-12-04 03:46:54 +0000615 __inet6_hash(newsk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800616
617 return newsk;
618
619out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700620 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200621out_nonewsk:
622 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800623out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700624 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800625 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800626 sock_kfree_s(sk, opt, opt->tot_len);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800627 return NULL;
628}
629
630/* The socket must have it's spinlock held when we get
631 * here.
632 *
633 * We have a potential double-lock case here, so even when
634 * doing backlog processing we use the BH locking scheme.
635 * This is because we cannot sleep with the original spinlock
636 * held.
637 */
638static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
639{
640 struct ipv6_pinfo *np = inet6_sk(sk);
641 struct sk_buff *opt_skb = NULL;
642
643 /* Imagine: socket is IPv6. IPv4 packet arrives,
644 goes to IPv4 receive handler and backlogged.
645 From backlog it always goes here. Kerboom...
646 Fortunately, dccp_rcv_established and rcv_established
647 handle them correctly, but it is not case with
648 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
649 */
650
651 if (skb->protocol == htons(ETH_P_IP))
652 return dccp_v4_do_rcv(sk, skb);
653
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700654 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800655 goto discard;
656
657 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800658 * socket locking is here for SMP purposes as backlog rcv is currently
659 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800660 */
661
662 /* Do Stevens' IPV6_PKTOPTIONS.
663
664 Yes, guys, it is the only place in our code, where we
665 may make it not affecting IPv4.
666 The rest of code is protocol independent,
667 and I do not like idea to uglify IPv4.
668
669 Actually, all the idea behind IPV6_PKTOPTIONS
670 looks not very well thought. For now we latch
671 options, received in the last packet, enqueued
672 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900673 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800674 */
675 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200676 /*
677 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
678 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
679 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800680 opt_skb = skb_clone(skb, GFP_ATOMIC);
681
682 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
683 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
684 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700685 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200686 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700687 __kfree_skb(opt_skb);
688 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800689 return 0;
690 }
691
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200692 /*
693 * Step 3: Process LISTEN state
694 * If S.state == LISTEN,
695 * If P.type == Request or P contains a valid Init Cookie option,
696 * (* Must scan the packet's options to check for Init
697 * Cookies. Only Init Cookies are processed here,
698 * however; other options are processed in Step 8. This
699 * scan need only be performed if the endpoint uses Init
700 * Cookies *)
701 * (* Generate a new socket and switch to that socket *)
702 * Set S := new socket for this port pair
703 * S.state = RESPOND
704 * Choose S.ISS (initial seqno) or set from Init Cookies
705 * Initialize S.GAR := S.ISS
706 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
707 * Continue with S.state == RESPOND
708 * (* A Response packet will be generated in Step 11 *)
709 * Otherwise,
710 * Generate Reset(No Connection) unless P.type == Reset
711 * Drop packet and return
712 *
713 * NOTE: the check for the packet types is done in
714 * dccp_rcv_state_process
715 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800716 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800717 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800718
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800719 if (nsk == NULL)
720 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800721 /*
722 * Queue it on the new socket if the new socket is active,
723 * otherwise we just shortcircuit this and continue with
724 * the new socket..
725 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200726 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800727 if (dccp_child_process(sk, nsk, skb))
728 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800729 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800730 __kfree_skb(opt_skb);
731 return 0;
732 }
733 }
734
735 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
736 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700737 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200738 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700739 __kfree_skb(opt_skb);
740 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800741 return 0;
742
743reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800744 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800745discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800746 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800747 __kfree_skb(opt_skb);
748 kfree_skb(skb);
749 return 0;
750}
751
Herbert Xue5bbef22007-10-15 12:50:28 -0700752static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800753{
754 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800755 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200756 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800757
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200758 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800759
760 if (dccp_invalid_packet(skb))
761 goto discard_it;
762
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200763 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700764 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
765 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200766 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200767 goto discard_it;
768 }
769
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800770 dh = dccp_hdr(skb);
771
Gerrit Renkerfde20102007-10-24 10:12:09 -0200772 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800773 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
774
775 if (dccp_packet_without_ack(skb))
776 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
777 else
778 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
779
780 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200781 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700782 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
783 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800784 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800785 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200786 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800787 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200788 if (sk == NULL) {
789 dccp_pr_debug("failed to look up flow ID in table and "
790 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800791 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200792 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800793
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800794 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800795 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200796 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800797 * Generate Reset(No Connection) unless P.type == Reset
798 * Drop packet and return
799 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200800 if (sk->sk_state == DCCP_TIME_WAIT) {
801 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
802 inet_twsk_put(inet_twsk(sk));
803 goto no_dccp_socket;
804 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800805
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200806 /*
807 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200808 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
809 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200810 */
811 min_cov = dccp_sk(sk)->dccps_pcrlen;
812 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
813 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
814 dh->dccph_cscov, min_cov);
815 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
816 goto discard_and_relse;
817 }
818
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800819 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
820 goto discard_and_relse;
821
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200822 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823
824no_dccp_socket:
825 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
826 goto discard_it;
827 /*
828 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200829 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800830 * Generate Reset(No Connection) unless P.type == Reset
831 * Drop packet and return
832 */
833 if (dh->dccph_type != DCCP_PKT_RESET) {
834 DCCP_SKB_CB(skb)->dccpd_reset_code =
835 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800836 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800837 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200838
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800839discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800840 kfree_skb(skb);
841 return 0;
842
843discard_and_relse:
844 sock_put(sk);
845 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800846}
847
Gerrit Renker73c9e022006-11-10 13:01:31 -0200848static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
849 int addr_len)
850{
851 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
852 struct inet_connection_sock *icsk = inet_csk(sk);
853 struct inet_sock *inet = inet_sk(sk);
854 struct ipv6_pinfo *np = inet6_sk(sk);
855 struct dccp_sock *dp = dccp_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000856 struct in6_addr *saddr = NULL, *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500857 struct flowi6 fl6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200858 struct dst_entry *dst;
859 int addr_type;
860 int err;
861
862 dp->dccps_role = DCCP_ROLE_CLIENT;
863
864 if (addr_len < SIN6_LEN_RFC2133)
865 return -EINVAL;
866
867 if (usin->sin6_family != AF_INET6)
868 return -EAFNOSUPPORT;
869
David S. Miller4c9483b2011-03-12 16:22:43 -0500870 memset(&fl6, 0, sizeof(fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200871
872 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500873 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
874 IP6_ECN_flow_init(fl6.flowlabel);
875 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
Gerrit Renker73c9e022006-11-10 13:01:31 -0200876 struct ip6_flowlabel *flowlabel;
David S. Miller4c9483b2011-03-12 16:22:43 -0500877 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200878 if (flowlabel == NULL)
879 return -EINVAL;
880 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
881 fl6_sock_release(flowlabel);
882 }
883 }
884 /*
885 * connect() to INADDR_ANY means loopback (BSD'ism).
886 */
887 if (ipv6_addr_any(&usin->sin6_addr))
888 usin->sin6_addr.s6_addr[15] = 1;
889
890 addr_type = ipv6_addr_type(&usin->sin6_addr);
891
892 if (addr_type & IPV6_ADDR_MULTICAST)
893 return -ENETUNREACH;
894
895 if (addr_type & IPV6_ADDR_LINKLOCAL) {
896 if (addr_len >= sizeof(struct sockaddr_in6) &&
897 usin->sin6_scope_id) {
898 /* If interface is set while binding, indices
899 * must coincide.
900 */
901 if (sk->sk_bound_dev_if &&
902 sk->sk_bound_dev_if != usin->sin6_scope_id)
903 return -EINVAL;
904
905 sk->sk_bound_dev_if = usin->sin6_scope_id;
906 }
907
908 /* Connect to link-local address requires an interface */
909 if (!sk->sk_bound_dev_if)
910 return -EINVAL;
911 }
912
913 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
David S. Miller4c9483b2011-03-12 16:22:43 -0500914 np->flow_label = fl6.flowlabel;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200915
916 /*
917 * DCCP over IPv4
918 */
919 if (addr_type == IPV6_ADDR_MAPPED) {
920 u32 exthdrlen = icsk->icsk_ext_hdr_len;
921 struct sockaddr_in sin;
922
923 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
924
925 if (__ipv6_only_sock(sk))
926 return -ENETUNREACH;
927
928 sin.sin_family = AF_INET;
929 sin.sin_port = usin->sin6_port;
930 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
931
932 icsk->icsk_af_ops = &dccp_ipv6_mapped;
933 sk->sk_backlog_rcv = dccp_v4_do_rcv;
934
935 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
936 if (err) {
937 icsk->icsk_ext_hdr_len = exthdrlen;
938 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
939 sk->sk_backlog_rcv = dccp_v6_do_rcv;
940 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200941 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000942 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
943 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200944
945 return err;
946 }
947
948 if (!ipv6_addr_any(&np->rcv_saddr))
949 saddr = &np->rcv_saddr;
950
David S. Miller4c9483b2011-03-12 16:22:43 -0500951 fl6.flowi6_proto = IPPROTO_DCCP;
952 ipv6_addr_copy(&fl6.daddr, &np->daddr);
953 ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
954 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500955 fl6.fl6_dport = usin->sin6_port;
956 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500957 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200958
David S. Miller4c9483b2011-03-12 16:22:43 -0500959 final_p = fl6_update_dst(&fl6, np->opt, &final);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200960
David S. Miller4c9483b2011-03-12 16:22:43 -0500961 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800962 if (IS_ERR(dst)) {
963 err = PTR_ERR(dst);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200964 goto failure;
David S. Miller14e50e52007-05-24 18:17:54 -0700965 }
Gerrit Renker73c9e022006-11-10 13:01:31 -0200966
967 if (saddr == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500968 saddr = &fl6.saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200969 ipv6_addr_copy(&np->rcv_saddr, saddr);
970 }
971
972 /* set the source address */
973 ipv6_addr_copy(&np->saddr, saddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000974 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200975
976 __ip6_dst_store(sk, dst, NULL, NULL);
977
978 icsk->icsk_ext_hdr_len = 0;
979 if (np->opt != NULL)
980 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
981 np->opt->opt_nflen);
982
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000983 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200984
985 dccp_set_state(sk, DCCP_REQUESTING);
986 err = inet6_hash_connect(&dccp_death_row, sk);
987 if (err)
988 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -0200989
990 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
991 np->daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000992 inet->inet_sport,
993 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200994 err = dccp_connect(sk);
995 if (err)
996 goto late_failure;
997
998 return 0;
999
1000late_failure:
1001 dccp_set_state(sk, DCCP_CLOSED);
1002 __sk_dst_reset(sk);
1003failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001004 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001005 sk->sk_route_caps = 0;
1006 return err;
1007}
1008
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001009static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001010 .queue_xmit = inet6_csk_xmit,
1011 .send_check = dccp_v6_send_check,
1012 .rebuild_header = inet6_sk_rebuild_header,
1013 .conn_request = dccp_v6_conn_request,
1014 .syn_recv_sock = dccp_v6_request_recv_sock,
1015 .net_header_len = sizeof(struct ipv6hdr),
1016 .setsockopt = ipv6_setsockopt,
1017 .getsockopt = ipv6_getsockopt,
1018 .addr2sockaddr = inet6_csk_addr2sockaddr,
1019 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001020 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001021#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001022 .compat_setsockopt = compat_ipv6_setsockopt,
1023 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001024#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001025};
1026
1027/*
1028 * DCCP over IPv4 via INET6 API
1029 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001030static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001031 .queue_xmit = ip_queue_xmit,
1032 .send_check = dccp_v4_send_check,
1033 .rebuild_header = inet_sk_rebuild_header,
1034 .conn_request = dccp_v6_conn_request,
1035 .syn_recv_sock = dccp_v6_request_recv_sock,
1036 .net_header_len = sizeof(struct iphdr),
1037 .setsockopt = ipv6_setsockopt,
1038 .getsockopt = ipv6_getsockopt,
1039 .addr2sockaddr = inet6_csk_addr2sockaddr,
1040 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001041#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001042 .compat_setsockopt = compat_ipv6_setsockopt,
1043 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001044#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001045};
1046
1047/* NOTE: A lot of things set to zero explicitly by call to
1048 * sk_alloc() so need not be done here.
1049 */
1050static int dccp_v6_init_sock(struct sock *sk)
1051{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001052 static __u8 dccp_v6_ctl_sock_initialized;
1053 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001054
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001055 if (err == 0) {
1056 if (unlikely(!dccp_v6_ctl_sock_initialized))
1057 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001058 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001059 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001060
1061 return err;
1062}
1063
Brian Haley7d06b2e2008-06-14 17:04:49 -07001064static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001065{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001066 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001067 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001068}
1069
Gerrit Renker73c9e022006-11-10 13:01:31 -02001070static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1071 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1072};
1073
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001074static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001075 .name = "DCCPv6",
1076 .owner = THIS_MODULE,
1077 .close = dccp_close,
1078 .connect = dccp_v6_connect,
1079 .disconnect = dccp_disconnect,
1080 .ioctl = dccp_ioctl,
1081 .init = dccp_v6_init_sock,
1082 .setsockopt = dccp_setsockopt,
1083 .getsockopt = dccp_getsockopt,
1084 .sendmsg = dccp_sendmsg,
1085 .recvmsg = dccp_recvmsg,
1086 .backlog_rcv = dccp_v6_do_rcv,
1087 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001088 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001089 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001090 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001091 .shutdown = dccp_shutdown,
1092 .destroy = dccp_v6_destroy_sock,
1093 .orphan_count = &dccp_orphan_count,
1094 .max_header = MAX_DCCP_HEADER,
1095 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001096 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001097 .rsk_prot = &dccp6_request_sock_ops,
1098 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001099 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001100#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001101 .compat_setsockopt = compat_dccp_setsockopt,
1102 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001103#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001104};
1105
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001106static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001107 .handler = dccp_v6_rcv,
1108 .err_handler = dccp_v6_err,
1109 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001110};
1111
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001112static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001113 .family = PF_INET6,
1114 .owner = THIS_MODULE,
1115 .release = inet6_release,
1116 .bind = inet6_bind,
1117 .connect = inet_stream_connect,
1118 .socketpair = sock_no_socketpair,
1119 .accept = inet_accept,
1120 .getname = inet6_getname,
1121 .poll = dccp_poll,
1122 .ioctl = inet6_ioctl,
1123 .listen = inet_dccp_listen,
1124 .shutdown = inet_shutdown,
1125 .setsockopt = sock_common_setsockopt,
1126 .getsockopt = sock_common_getsockopt,
1127 .sendmsg = inet_sendmsg,
1128 .recvmsg = sock_common_recvmsg,
1129 .mmap = sock_no_mmap,
1130 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001131#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001132 .compat_setsockopt = compat_sock_common_setsockopt,
1133 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001134#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001135};
1136
1137static struct inet_protosw dccp_v6_protosw = {
1138 .type = SOCK_DCCP,
1139 .protocol = IPPROTO_DCCP,
1140 .prot = &dccp_v6_prot,
1141 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001142 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001143};
1144
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001145static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001146{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001147 if (dccp_hashinfo.bhash == NULL)
1148 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001149
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001150 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1151 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001152}
1153
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001154static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001155{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001156 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001157}
1158
1159static struct pernet_operations dccp_v6_ops = {
1160 .init = dccp_v6_init_net,
1161 .exit = dccp_v6_exit_net,
1162};
1163
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001164static int __init dccp_v6_init(void)
1165{
1166 int err = proto_register(&dccp_v6_prot, 1);
1167
1168 if (err != 0)
1169 goto out;
1170
1171 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1172 if (err != 0)
1173 goto out_unregister_proto;
1174
1175 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001176
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001177 err = register_pernet_subsys(&dccp_v6_ops);
1178 if (err != 0)
1179 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001180out:
1181 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001182
1183out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001184 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1185 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001186out_unregister_proto:
1187 proto_unregister(&dccp_v6_prot);
1188 goto out;
1189}
1190
1191static void __exit dccp_v6_exit(void)
1192{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001193 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001194 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1195 inet6_unregister_protosw(&dccp_v6_protosw);
1196 proto_unregister(&dccp_v6_prot);
1197}
1198
1199module_init(dccp_v6_init);
1200module_exit(dccp_v6_exit);
1201
1202/*
1203 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1204 * values directly, Also cover the case where the protocol is not specified,
1205 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1206 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001207MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1208MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001209MODULE_LICENSE("GPL");
1210MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1211MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");