blob: de1b7e37ad5b7fdb4431988e1f1e212fc0bd71a9 [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>
32
33#include "dccp.h"
34#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070035#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080036
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070037/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080038
Stephen Hemminger3b401a82009-09-01 19:25:04 +000039static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080041
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080042static void dccp_v6_hash(struct sock *sk)
43{
44 if (sk->sk_state != DCCP_CLOSED) {
45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080046 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080047 return;
48 }
49 local_bh_disable();
Eric Dumazet9327f702009-12-04 03:46:54 +000050 __inet6_hash(sk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080051 local_bh_enable();
52 }
53}
54
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020055/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080056static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020057 struct in6_addr *saddr,
58 struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080059{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020060 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
61}
62
Herbert Xubb296242010-04-11 02:15:55 +000063static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020064{
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct dccp_hdr *dh = dccp_hdr(skb);
67
68 dccp_csum_outgoing(skb);
69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080070}
71
Al Viro7d533f92006-11-14 21:51:36 -080072static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -020073 __be16 sport, __be16 dport )
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080074{
Gerrit Renkerd7f73652006-11-13 13:34:38 -020075 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
76}
77
78static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
79{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070080 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
81 ipv6_hdr(skb)->saddr.s6_addr32,
Gerrit Renkerd7f73652006-11-13 13:34:38 -020082 dccp_hdr(skb)->dccph_dport,
83 dccp_hdr(skb)->dccph_sport );
84
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080085}
86
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080087static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070088 u8 type, u8 code, int offset, __be32 info)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080089{
90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
Wei Yongjune0bcfb02008-07-26 11:59:10 +010092 struct dccp_sock *dp;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080093 struct ipv6_pinfo *np;
94 struct sock *sk;
95 int err;
96 __u64 seq;
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -070097 struct net *net = dev_net(skb->dev);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080098
Wei Yongjun860239c2008-07-26 11:59:11 +010099 if (skb->len < offset + sizeof(*dh) ||
100 skb->len < offset + __dccp_basic_hdr_len(dh)) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700101 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
102 ICMP6_MIB_INERRORS);
Wei Yongjun860239c2008-07-26 11:59:11 +0100103 return;
104 }
105
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -0700106 sk = inet6_lookup(net, &dccp_hashinfo,
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700107 &hdr->daddr, dh->dccph_dport,
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800109
110 if (sk == NULL) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 ICMP6_MIB_INERRORS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800113 return;
114 }
115
116 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700117 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800118 return;
119 }
120
121 bh_lock_sock(sk);
122 if (sock_owned_by_user(sk))
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800124
125 if (sk->sk_state == DCCP_CLOSED)
126 goto out;
127
Wei Yongjune0bcfb02008-07-26 11:59:10 +0100128 dp = dccp_sk(sk);
129 seq = dccp_hdr_seq(dh);
130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 goto out;
134 }
135
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800136 np = inet6_sk(sk);
137
138 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800139 struct dst_entry *dst = NULL;
140
141 if (sock_owned_by_user(sk))
142 goto out;
143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
144 goto out;
145
146 /* icmp should have updated the destination cache entry */
147 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800148 if (dst == NULL) {
149 struct inet_sock *inet = inet_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500150 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800151
152 /* BUGGG_FUTURE: Again, it is not clear how
153 to handle rthdr case. Ignore this complexity
154 for now.
155 */
David S. Miller4c9483b2011-03-12 16:22:43 -0500156 memset(&fl6, 0, sizeof(fl6));
157 fl6.flowi6_proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl6.daddr, &np->daddr);
159 ipv6_addr_copy(&fl6.saddr, &np->saddr);
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500161 fl6.fl6_dport = inet->inet_dport;
162 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500163 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800164
David S. Miller4c9483b2011-03-12 16:22:43 -0500165 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800166 if (IS_ERR(dst)) {
167 sk->sk_err_soft = -PTR_ERR(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800168 goto out;
169 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800170 } else
171 dst_hold(dst);
172
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800173 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800174 dccp_sync_mss(sk, dst_mtu(dst));
175 } /* else let the usual retransmit timer handle it */
176 dst_release(dst);
177 goto out;
178 }
179
180 icmpv6_err_convert(type, code, &err);
181
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800182 /* Might be for an request_sock */
183 switch (sk->sk_state) {
184 struct request_sock *req, **prev;
185 case DCCP_LISTEN:
186 if (sock_owned_by_user(sk))
187 goto out;
188
189 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
190 &hdr->daddr, &hdr->saddr,
191 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800192 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800193 goto out;
194
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800195 /*
196 * ICMPs are not backlogged, hence we cannot get an established
197 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800198 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700199 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800200
201 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700202 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800203 goto out;
204 }
205
206 inet_csk_reqsk_queue_drop(sk, req, prev);
207 goto out;
208
209 case DCCP_REQUESTING:
210 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800211 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800212 if (!sock_owned_by_user(sk)) {
213 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
214 sk->sk_err = err;
215 /*
216 * Wake people up to see the error
217 * (see connect in sock.c)
218 */
219 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800220 dccp_done(sk);
221 } else
222 sk->sk_err_soft = err;
223 goto out;
224 }
225
226 if (!sock_owned_by_user(sk) && np->recverr) {
227 sk->sk_err = err;
228 sk->sk_error_report(sk);
229 } else
230 sk->sk_err_soft = err;
231
232out:
233 bh_unlock_sock(sk);
234 sock_put(sk);
235}
236
237
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000238static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
239 struct request_values *rv_unused)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800240{
241 struct inet6_request_sock *ireq6 = inet6_rsk(req);
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 struct sk_buff *skb;
244 struct ipv6_txoptions *opt = NULL;
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000245 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500246 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800247 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800248 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800249
David S. Miller4c9483b2011-03-12 16:22:43 -0500250 memset(&fl6, 0, sizeof(fl6));
251 fl6.flowi6_proto = IPPROTO_DCCP;
252 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
253 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
254 fl6.flowlabel = 0;
255 fl6.flowi6_oif = ireq6->iif;
David S. Miller1958b852011-03-12 16:36:19 -0500256 fl6.fl6_dport = inet_rsk(req)->rmt_port;
257 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500258 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800259
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800260 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800261
David S. Miller4c9483b2011-03-12 16:22:43 -0500262 final_p = fl6_update_dst(&fl6, opt, &final);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800263
David S. Miller4c9483b2011-03-12 16:22:43 -0500264 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800265 if (IS_ERR(dst)) {
266 err = PTR_ERR(dst);
267 dst = NULL;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800268 goto done;
David S. Miller68d0c6d2011-03-01 13:19:07 -0800269 }
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800270
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800271 skb = dccp_make_response(sk, dst, req);
272 if (skb != NULL) {
273 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800274
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200275 dh->dccph_checksum = dccp_v6_csum_finish(skb,
276 &ireq6->loc_addr,
277 &ireq6->rmt_addr);
David S. Miller4c9483b2011-03-12 16:22:43 -0500278 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
279 err = ip6_xmit(sk, skb, &fl6, opt);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200280 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800281 }
282
283done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800284 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800285 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800286 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800287 return err;
288}
289
290static void dccp_v6_reqsk_destructor(struct request_sock *req)
291{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800292 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800293 if (inet6_rsk(req)->pktopts != NULL)
294 kfree_skb(inet6_rsk(req)->pktopts);
295}
296
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800297static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800298{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700299 struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800300 struct sk_buff *skb;
David S. Miller4c9483b2011-03-12 16:22:43 -0500301 struct flowi6 fl6;
Eric Dumazetadf30902009-06-02 05:19:30 +0000302 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700303 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000304 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800305
Gerrit Renkere356d372007-09-26 14:35:19 -0300306 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800307 return;
308
309 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800310 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800311
Pavel Emelyanov02047742008-04-13 22:32:25 -0700312 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800313 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200314 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800315
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700316 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300317 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
318 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200319
David S. Miller4c9483b2011-03-12 16:22:43 -0500320 memset(&fl6, 0, sizeof(fl6));
321 ipv6_addr_copy(&fl6.daddr, &rxip6h->saddr);
322 ipv6_addr_copy(&fl6.saddr, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200323
David S. Miller4c9483b2011-03-12 16:22:43 -0500324 fl6.flowi6_proto = IPPROTO_DCCP;
325 fl6.flowi6_oif = inet6_iif(rxskb);
David S. Miller1958b852011-03-12 16:36:19 -0500326 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
327 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500328 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800329
330 /* sk = NULL, but it is safe for now. RST socket required. */
David S. Miller4c9483b2011-03-12 16:22:43 -0500331 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800332 if (!IS_ERR(dst)) {
333 skb_dst_set(skb, dst);
David S. Miller4c9483b2011-03-12 16:22:43 -0500334 ip6_xmit(ctl_sk, skb, &fl6, NULL);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800335 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
336 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
337 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800338 }
339
340 kfree_skb(skb);
341}
342
Gerrit Renker73c9e022006-11-10 13:01:31 -0200343static struct request_sock_ops dccp6_request_sock_ops = {
344 .family = AF_INET6,
345 .obj_size = sizeof(struct dccp6_request_sock),
346 .rtx_syn_ack = dccp_v6_send_response,
347 .send_ack = dccp_reqsk_send_ack,
348 .destructor = dccp_v6_reqsk_destructor,
349 .send_reset = dccp_v6_ctl_send_reset,
350};
351
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800352static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
353{
354 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700355 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800356 struct sock *nsk;
357 struct request_sock **prev;
358 /* Find possible connection requests. */
359 struct request_sock *req = inet6_csk_search_req(sk, &prev,
360 dh->dccph_sport,
361 &iph->saddr,
362 &iph->daddr,
363 inet6_iif(skb));
364 if (req != NULL)
365 return dccp_check_req(sk, skb, req, prev);
366
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700367 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800368 &iph->saddr, dh->dccph_sport,
369 &iph->daddr, ntohs(dh->dccph_dport),
370 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800371 if (nsk != NULL) {
372 if (nsk->sk_state != DCCP_TIME_WAIT) {
373 bh_lock_sock(nsk);
374 return nsk;
375 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700376 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800377 return NULL;
378 }
379
380 return sk;
381}
382
383static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
384{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800385 struct request_sock *req;
386 struct dccp_request_sock *dreq;
387 struct inet6_request_sock *ireq6;
388 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200389 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800390 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800391
392 if (skb->protocol == htons(ETH_P_IP))
393 return dccp_v4_conn_request(sk, skb);
394
395 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700396 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800397
398 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700399 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800400 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200401 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800402 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800403 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800404 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700405 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800406 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800407 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800408
409 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
410 goto drop;
411
Gerrit Renker82709532006-10-11 16:26:54 +0100412 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800413 if (req == NULL)
414 goto drop;
415
Gerrit Renkerac757732008-11-04 23:55:49 -0800416 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
417 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800418
Gerrit Renker8b819412007-12-13 12:29:24 -0200419 dreq = dccp_rsk(req);
420 if (dccp_parse_options(sk, dreq, skb))
421 goto drop_and_free;
422
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700423 if (security_inet_conn_request(sk, skb, req))
424 goto drop_and_free;
425
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800426 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700427 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
428 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800429
430 if (ipv6_opt_accepted(sk, skb) ||
431 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
432 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
433 atomic_inc(&skb->users);
434 ireq6->pktopts = skb;
435 }
436 ireq6->iif = sk->sk_bound_dev_if;
437
438 /* So that link locals have meaning */
439 if (!sk->sk_bound_dev_if &&
440 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
441 ireq6->iif = inet6_iif(skb);
442
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800443 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800444 * Step 3: Process LISTEN state
445 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200446 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800447 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200448 * In fact we defer setting S.GSR, S.SWL, S.SWH to
449 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800450 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800451 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200452 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800453 dreq->dreq_service = service;
454
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000455 if (dccp_v6_send_response(sk, req, NULL))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800456 goto drop_and_free;
457
458 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
459 return 0;
460
461drop_and_free:
462 reqsk_free(req);
463drop:
464 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800465 return -1;
466}
467
468static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
469 struct sk_buff *skb,
470 struct request_sock *req,
471 struct dst_entry *dst)
472{
473 struct inet6_request_sock *ireq6 = inet6_rsk(req);
474 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
475 struct inet_sock *newinet;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800476 struct dccp6_sock *newdp6;
477 struct sock *newsk;
478 struct ipv6_txoptions *opt;
479
480 if (skb->protocol == htons(ETH_P_IP)) {
481 /*
482 * v6 mapped
483 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800484 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800485 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800486 return NULL;
487
488 newdp6 = (struct dccp6_sock *)newsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800489 newinet = inet_sk(newsk);
490 newinet->pinet6 = &newdp6->inet6;
491 newnp = inet6_sk(newsk);
492
493 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
494
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000495 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800496
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000497 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800498
499 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
500
501 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
502 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
503 newnp->pktoptions = NULL;
504 newnp->opt = NULL;
505 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700506 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800507
508 /*
509 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
510 * here, dccp_create_openreq_child now does this for us, see the comment in
511 * that function for the gory details. -acme
512 */
513
514 /* It is tricky place. Until this moment IPv4 tcp
515 worked with IPv6 icsk.icsk_af_ops.
516 Sync it now.
517 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800518 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800519
520 return newsk;
521 }
522
523 opt = np->opt;
524
525 if (sk_acceptq_is_full(sk))
526 goto out_overflow;
527
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800528 if (dst == NULL) {
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000529 struct in6_addr *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500530 struct flowi6 fl6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800531
David S. Miller4c9483b2011-03-12 16:22:43 -0500532 memset(&fl6, 0, sizeof(fl6));
533 fl6.flowi6_proto = IPPROTO_DCCP;
534 ipv6_addr_copy(&fl6.daddr, &ireq6->rmt_addr);
535 final_p = fl6_update_dst(&fl6, opt, &final);
536 ipv6_addr_copy(&fl6.saddr, &ireq6->loc_addr);
537 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500538 fl6.fl6_dport = inet_rsk(req)->rmt_port;
539 fl6.fl6_sport = inet_rsk(req)->loc_port;
David S. Miller4c9483b2011-03-12 16:22:43 -0500540 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800541
David S. Miller4c9483b2011-03-12 16:22:43 -0500542 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800543 if (IS_ERR(dst))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800544 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800545 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800546
547 newsk = dccp_create_openreq_child(sk, req, skb);
548 if (newsk == NULL)
Balazs Scheidler093d2822010-10-21 13:06:43 +0200549 goto out_nonewsk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800550
551 /*
552 * No need to charge this sock to the relevant IPv6 refcnt debug socks
553 * count here, dccp_create_openreq_child now does this for us, see the
554 * comment in that function for the gory details. -acme
555 */
556
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700557 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800558 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
559 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800560 newdp6 = (struct dccp6_sock *)newsk;
561 newinet = inet_sk(newsk);
562 newinet->pinet6 = &newdp6->inet6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800563 newnp = inet6_sk(newsk);
564
565 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
566
567 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
568 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
569 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
570 newsk->sk_bound_dev_if = ireq6->iif;
571
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800572 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800573
574 First: no IPv4 options.
575 */
576 newinet->opt = NULL;
577
578 /* Clone RX bits */
579 newnp->rxopt.all = np->rxopt.all;
580
581 /* Clone pktoptions received with SYN */
582 newnp->pktoptions = NULL;
583 if (ireq6->pktopts != NULL) {
584 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
585 kfree_skb(ireq6->pktopts);
586 ireq6->pktopts = NULL;
587 if (newnp->pktoptions)
588 skb_set_owner_r(newnp->pktoptions, newsk);
589 }
590 newnp->opt = NULL;
591 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700592 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800593
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800594 /*
595 * Clone native IPv6 options from listening socket (if any)
596 *
597 * Yes, keeping reference count would be much more clever, but we make
598 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800599 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800600 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800601 newnp->opt = ipv6_dup_options(newsk, opt);
602 if (opt != np->opt)
603 sock_kfree_s(sk, opt, opt->tot_len);
604 }
605
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800606 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800607 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800608 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
609 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800610
611 dccp_sync_mss(newsk, dst_mtu(dst));
612
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000613 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
614 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800615
Balazs Scheidler093d2822010-10-21 13:06:43 +0200616 if (__inet_inherit_port(sk, newsk) < 0) {
617 sock_put(newsk);
618 goto out;
619 }
Eric Dumazet9327f702009-12-04 03:46:54 +0000620 __inet6_hash(newsk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800621
622 return newsk;
623
624out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700625 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Balazs Scheidler093d2822010-10-21 13:06:43 +0200626out_nonewsk:
627 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800628out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700629 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800630 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800631 sock_kfree_s(sk, opt, opt->tot_len);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800632 return NULL;
633}
634
635/* The socket must have it's spinlock held when we get
636 * here.
637 *
638 * We have a potential double-lock case here, so even when
639 * doing backlog processing we use the BH locking scheme.
640 * This is because we cannot sleep with the original spinlock
641 * held.
642 */
643static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
644{
645 struct ipv6_pinfo *np = inet6_sk(sk);
646 struct sk_buff *opt_skb = NULL;
647
648 /* Imagine: socket is IPv6. IPv4 packet arrives,
649 goes to IPv4 receive handler and backlogged.
650 From backlog it always goes here. Kerboom...
651 Fortunately, dccp_rcv_established and rcv_established
652 handle them correctly, but it is not case with
653 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
654 */
655
656 if (skb->protocol == htons(ETH_P_IP))
657 return dccp_v4_do_rcv(sk, skb);
658
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700659 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800660 goto discard;
661
662 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800663 * socket locking is here for SMP purposes as backlog rcv is currently
664 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800665 */
666
667 /* Do Stevens' IPV6_PKTOPTIONS.
668
669 Yes, guys, it is the only place in our code, where we
670 may make it not affecting IPv4.
671 The rest of code is protocol independent,
672 and I do not like idea to uglify IPv4.
673
674 Actually, all the idea behind IPV6_PKTOPTIONS
675 looks not very well thought. For now we latch
676 options, received in the last packet, enqueued
677 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900678 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800679 */
680 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200681 /*
682 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
683 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
684 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800685 opt_skb = skb_clone(skb, GFP_ATOMIC);
686
687 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
688 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
689 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700690 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200691 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700692 __kfree_skb(opt_skb);
693 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800694 return 0;
695 }
696
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200697 /*
698 * Step 3: Process LISTEN state
699 * If S.state == LISTEN,
700 * If P.type == Request or P contains a valid Init Cookie option,
701 * (* Must scan the packet's options to check for Init
702 * Cookies. Only Init Cookies are processed here,
703 * however; other options are processed in Step 8. This
704 * scan need only be performed if the endpoint uses Init
705 * Cookies *)
706 * (* Generate a new socket and switch to that socket *)
707 * Set S := new socket for this port pair
708 * S.state = RESPOND
709 * Choose S.ISS (initial seqno) or set from Init Cookies
710 * Initialize S.GAR := S.ISS
711 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
712 * Continue with S.state == RESPOND
713 * (* A Response packet will be generated in Step 11 *)
714 * Otherwise,
715 * Generate Reset(No Connection) unless P.type == Reset
716 * Drop packet and return
717 *
718 * NOTE: the check for the packet types is done in
719 * dccp_rcv_state_process
720 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800721 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800722 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800723
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800724 if (nsk == NULL)
725 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800726 /*
727 * Queue it on the new socket if the new socket is active,
728 * otherwise we just shortcircuit this and continue with
729 * the new socket..
730 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200731 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800732 if (dccp_child_process(sk, nsk, skb))
733 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800734 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800735 __kfree_skb(opt_skb);
736 return 0;
737 }
738 }
739
740 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
741 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700742 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200743 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700744 __kfree_skb(opt_skb);
745 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800746 return 0;
747
748reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800749 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800750discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800751 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800752 __kfree_skb(opt_skb);
753 kfree_skb(skb);
754 return 0;
755}
756
Herbert Xue5bbef22007-10-15 12:50:28 -0700757static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800758{
759 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800760 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200761 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800762
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200763 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800764
765 if (dccp_invalid_packet(skb))
766 goto discard_it;
767
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200768 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700769 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
770 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200771 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200772 goto discard_it;
773 }
774
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800775 dh = dccp_hdr(skb);
776
Gerrit Renkerfde20102007-10-24 10:12:09 -0200777 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800778 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
779
780 if (dccp_packet_without_ack(skb))
781 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
782 else
783 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
784
785 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200786 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700787 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
788 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800789 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800790 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200791 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800792 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200793 if (sk == NULL) {
794 dccp_pr_debug("failed to look up flow ID in table and "
795 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800796 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200797 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800798
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800799 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800800 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200801 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800802 * Generate Reset(No Connection) unless P.type == Reset
803 * Drop packet and return
804 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200805 if (sk->sk_state == DCCP_TIME_WAIT) {
806 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
807 inet_twsk_put(inet_twsk(sk));
808 goto no_dccp_socket;
809 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800810
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200811 /*
812 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200813 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
814 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200815 */
816 min_cov = dccp_sk(sk)->dccps_pcrlen;
817 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
818 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
819 dh->dccph_cscov, min_cov);
820 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
821 goto discard_and_relse;
822 }
823
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800824 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
825 goto discard_and_relse;
826
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200827 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800828
829no_dccp_socket:
830 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
831 goto discard_it;
832 /*
833 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200834 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800835 * Generate Reset(No Connection) unless P.type == Reset
836 * Drop packet and return
837 */
838 if (dh->dccph_type != DCCP_PKT_RESET) {
839 DCCP_SKB_CB(skb)->dccpd_reset_code =
840 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800841 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800842 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200843
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800844discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800845 kfree_skb(skb);
846 return 0;
847
848discard_and_relse:
849 sock_put(sk);
850 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800851}
852
Gerrit Renker73c9e022006-11-10 13:01:31 -0200853static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
854 int addr_len)
855{
856 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
857 struct inet_connection_sock *icsk = inet_csk(sk);
858 struct inet_sock *inet = inet_sk(sk);
859 struct ipv6_pinfo *np = inet6_sk(sk);
860 struct dccp_sock *dp = dccp_sk(sk);
Arnaud Ebalard20c59de2010-06-01 21:35:01 +0000861 struct in6_addr *saddr = NULL, *final_p, final;
David S. Miller4c9483b2011-03-12 16:22:43 -0500862 struct flowi6 fl6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200863 struct dst_entry *dst;
864 int addr_type;
865 int err;
866
867 dp->dccps_role = DCCP_ROLE_CLIENT;
868
869 if (addr_len < SIN6_LEN_RFC2133)
870 return -EINVAL;
871
872 if (usin->sin6_family != AF_INET6)
873 return -EAFNOSUPPORT;
874
David S. Miller4c9483b2011-03-12 16:22:43 -0500875 memset(&fl6, 0, sizeof(fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200876
877 if (np->sndflow) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500878 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
879 IP6_ECN_flow_init(fl6.flowlabel);
880 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
Gerrit Renker73c9e022006-11-10 13:01:31 -0200881 struct ip6_flowlabel *flowlabel;
David S. Miller4c9483b2011-03-12 16:22:43 -0500882 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200883 if (flowlabel == NULL)
884 return -EINVAL;
885 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
886 fl6_sock_release(flowlabel);
887 }
888 }
889 /*
890 * connect() to INADDR_ANY means loopback (BSD'ism).
891 */
892 if (ipv6_addr_any(&usin->sin6_addr))
893 usin->sin6_addr.s6_addr[15] = 1;
894
895 addr_type = ipv6_addr_type(&usin->sin6_addr);
896
897 if (addr_type & IPV6_ADDR_MULTICAST)
898 return -ENETUNREACH;
899
900 if (addr_type & IPV6_ADDR_LINKLOCAL) {
901 if (addr_len >= sizeof(struct sockaddr_in6) &&
902 usin->sin6_scope_id) {
903 /* If interface is set while binding, indices
904 * must coincide.
905 */
906 if (sk->sk_bound_dev_if &&
907 sk->sk_bound_dev_if != usin->sin6_scope_id)
908 return -EINVAL;
909
910 sk->sk_bound_dev_if = usin->sin6_scope_id;
911 }
912
913 /* Connect to link-local address requires an interface */
914 if (!sk->sk_bound_dev_if)
915 return -EINVAL;
916 }
917
918 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
David S. Miller4c9483b2011-03-12 16:22:43 -0500919 np->flow_label = fl6.flowlabel;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200920
921 /*
922 * DCCP over IPv4
923 */
924 if (addr_type == IPV6_ADDR_MAPPED) {
925 u32 exthdrlen = icsk->icsk_ext_hdr_len;
926 struct sockaddr_in sin;
927
928 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
929
930 if (__ipv6_only_sock(sk))
931 return -ENETUNREACH;
932
933 sin.sin_family = AF_INET;
934 sin.sin_port = usin->sin6_port;
935 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
936
937 icsk->icsk_af_ops = &dccp_ipv6_mapped;
938 sk->sk_backlog_rcv = dccp_v4_do_rcv;
939
940 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
941 if (err) {
942 icsk->icsk_ext_hdr_len = exthdrlen;
943 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
944 sk->sk_backlog_rcv = dccp_v6_do_rcv;
945 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200946 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000947 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
948 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200949
950 return err;
951 }
952
953 if (!ipv6_addr_any(&np->rcv_saddr))
954 saddr = &np->rcv_saddr;
955
David S. Miller4c9483b2011-03-12 16:22:43 -0500956 fl6.flowi6_proto = IPPROTO_DCCP;
957 ipv6_addr_copy(&fl6.daddr, &np->daddr);
958 ipv6_addr_copy(&fl6.saddr, saddr ? saddr : &np->saddr);
959 fl6.flowi6_oif = sk->sk_bound_dev_if;
David S. Miller1958b852011-03-12 16:36:19 -0500960 fl6.fl6_dport = usin->sin6_port;
961 fl6.fl6_sport = inet->inet_sport;
David S. Miller4c9483b2011-03-12 16:22:43 -0500962 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
Gerrit Renker73c9e022006-11-10 13:01:31 -0200963
David S. Miller4c9483b2011-03-12 16:22:43 -0500964 final_p = fl6_update_dst(&fl6, np->opt, &final);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200965
David S. Miller4c9483b2011-03-12 16:22:43 -0500966 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
David S. Miller68d0c6d2011-03-01 13:19:07 -0800967 if (IS_ERR(dst)) {
968 err = PTR_ERR(dst);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200969 goto failure;
David S. Miller14e50e52007-05-24 18:17:54 -0700970 }
Gerrit Renker73c9e022006-11-10 13:01:31 -0200971
972 if (saddr == NULL) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500973 saddr = &fl6.saddr;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200974 ipv6_addr_copy(&np->rcv_saddr, saddr);
975 }
976
977 /* set the source address */
978 ipv6_addr_copy(&np->saddr, saddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000979 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200980
981 __ip6_dst_store(sk, dst, NULL, NULL);
982
983 icsk->icsk_ext_hdr_len = 0;
984 if (np->opt != NULL)
985 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
986 np->opt->opt_nflen);
987
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000988 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200989
990 dccp_set_state(sk, DCCP_REQUESTING);
991 err = inet6_hash_connect(&dccp_death_row, sk);
992 if (err)
993 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -0200994
995 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
996 np->daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000997 inet->inet_sport,
998 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200999 err = dccp_connect(sk);
1000 if (err)
1001 goto late_failure;
1002
1003 return 0;
1004
1005late_failure:
1006 dccp_set_state(sk, DCCP_CLOSED);
1007 __sk_dst_reset(sk);
1008failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001009 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001010 sk->sk_route_caps = 0;
1011 return err;
1012}
1013
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001014static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001015 .queue_xmit = inet6_csk_xmit,
1016 .send_check = dccp_v6_send_check,
1017 .rebuild_header = inet6_sk_rebuild_header,
1018 .conn_request = dccp_v6_conn_request,
1019 .syn_recv_sock = dccp_v6_request_recv_sock,
1020 .net_header_len = sizeof(struct ipv6hdr),
1021 .setsockopt = ipv6_setsockopt,
1022 .getsockopt = ipv6_getsockopt,
1023 .addr2sockaddr = inet6_csk_addr2sockaddr,
1024 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001025 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001026#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001027 .compat_setsockopt = compat_ipv6_setsockopt,
1028 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001029#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001030};
1031
1032/*
1033 * DCCP over IPv4 via INET6 API
1034 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001035static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001036 .queue_xmit = ip_queue_xmit,
1037 .send_check = dccp_v4_send_check,
1038 .rebuild_header = inet_sk_rebuild_header,
1039 .conn_request = dccp_v6_conn_request,
1040 .syn_recv_sock = dccp_v6_request_recv_sock,
1041 .net_header_len = sizeof(struct iphdr),
1042 .setsockopt = ipv6_setsockopt,
1043 .getsockopt = ipv6_getsockopt,
1044 .addr2sockaddr = inet6_csk_addr2sockaddr,
1045 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001046#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001047 .compat_setsockopt = compat_ipv6_setsockopt,
1048 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001049#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001050};
1051
1052/* NOTE: A lot of things set to zero explicitly by call to
1053 * sk_alloc() so need not be done here.
1054 */
1055static int dccp_v6_init_sock(struct sock *sk)
1056{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001057 static __u8 dccp_v6_ctl_sock_initialized;
1058 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001059
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001060 if (err == 0) {
1061 if (unlikely(!dccp_v6_ctl_sock_initialized))
1062 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001063 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001064 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001065
1066 return err;
1067}
1068
Brian Haley7d06b2e2008-06-14 17:04:49 -07001069static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001070{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001071 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001072 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001073}
1074
Gerrit Renker73c9e022006-11-10 13:01:31 -02001075static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1076 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1077};
1078
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001079static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001080 .name = "DCCPv6",
1081 .owner = THIS_MODULE,
1082 .close = dccp_close,
1083 .connect = dccp_v6_connect,
1084 .disconnect = dccp_disconnect,
1085 .ioctl = dccp_ioctl,
1086 .init = dccp_v6_init_sock,
1087 .setsockopt = dccp_setsockopt,
1088 .getsockopt = dccp_getsockopt,
1089 .sendmsg = dccp_sendmsg,
1090 .recvmsg = dccp_recvmsg,
1091 .backlog_rcv = dccp_v6_do_rcv,
1092 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001093 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001094 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001095 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001096 .shutdown = dccp_shutdown,
1097 .destroy = dccp_v6_destroy_sock,
1098 .orphan_count = &dccp_orphan_count,
1099 .max_header = MAX_DCCP_HEADER,
1100 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001101 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001102 .rsk_prot = &dccp6_request_sock_ops,
1103 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001104 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001105#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001106 .compat_setsockopt = compat_dccp_setsockopt,
1107 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001108#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001109};
1110
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001111static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001112 .handler = dccp_v6_rcv,
1113 .err_handler = dccp_v6_err,
1114 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001115};
1116
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001117static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001118 .family = PF_INET6,
1119 .owner = THIS_MODULE,
1120 .release = inet6_release,
1121 .bind = inet6_bind,
1122 .connect = inet_stream_connect,
1123 .socketpair = sock_no_socketpair,
1124 .accept = inet_accept,
1125 .getname = inet6_getname,
1126 .poll = dccp_poll,
1127 .ioctl = inet6_ioctl,
1128 .listen = inet_dccp_listen,
1129 .shutdown = inet_shutdown,
1130 .setsockopt = sock_common_setsockopt,
1131 .getsockopt = sock_common_getsockopt,
1132 .sendmsg = inet_sendmsg,
1133 .recvmsg = sock_common_recvmsg,
1134 .mmap = sock_no_mmap,
1135 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001136#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001137 .compat_setsockopt = compat_sock_common_setsockopt,
1138 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001139#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001140};
1141
1142static struct inet_protosw dccp_v6_protosw = {
1143 .type = SOCK_DCCP,
1144 .protocol = IPPROTO_DCCP,
1145 .prot = &dccp_v6_prot,
1146 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001147 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001148};
1149
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001150static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001151{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001152 if (dccp_hashinfo.bhash == NULL)
1153 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001154
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001155 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1156 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001157}
1158
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001159static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001160{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001161 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001162}
1163
1164static struct pernet_operations dccp_v6_ops = {
1165 .init = dccp_v6_init_net,
1166 .exit = dccp_v6_exit_net,
1167};
1168
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001169static int __init dccp_v6_init(void)
1170{
1171 int err = proto_register(&dccp_v6_prot, 1);
1172
1173 if (err != 0)
1174 goto out;
1175
1176 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1177 if (err != 0)
1178 goto out_unregister_proto;
1179
1180 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001181
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001182 err = register_pernet_subsys(&dccp_v6_ops);
1183 if (err != 0)
1184 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001185out:
1186 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001187
1188out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001189 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1190 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001191out_unregister_proto:
1192 proto_unregister(&dccp_v6_prot);
1193 goto out;
1194}
1195
1196static void __exit dccp_v6_exit(void)
1197{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001198 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001199 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1200 inet6_unregister_protosw(&dccp_v6_protosw);
1201 proto_unregister(&dccp_v6_prot);
1202}
1203
1204module_init(dccp_v6_init);
1205module_exit(dccp_v6_exit);
1206
1207/*
1208 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1209 * values directly, Also cover the case where the protocol is not specified,
1210 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1211 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001212MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1213MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001214MODULE_LICENSE("GPL");
1215MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1216MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");