blob: f033e845bb076aa2c911e7ccac4bcb8dc1f46856 [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>
17#include <linux/xfrm.h>
18
19#include <net/addrconf.h>
20#include <net/inet_common.h>
21#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020022#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080023#include <net/inet6_connection_sock.h>
24#include <net/inet6_hashtables.h>
25#include <net/ip6_route.h>
26#include <net/ipv6.h>
27#include <net/protocol.h>
28#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080029#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080030#include <net/xfrm.h>
31
32#include "dccp.h"
33#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070034#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080035
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070036/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080037
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080038static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
40
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080041static void dccp_v6_hash(struct sock *sk)
42{
43 if (sk->sk_state != DCCP_CLOSED) {
44 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080045 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080046 return;
47 }
48 local_bh_disable();
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080049 __inet6_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080050 local_bh_enable();
51 }
52}
53
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020054/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080055static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020056 struct in6_addr *saddr,
57 struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080058{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020059 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
60}
61
62static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
63 struct sk_buff *skb)
64{
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,
Andrea Bittau60fe62e2006-03-20 19:23:32 -080088 int type, int 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);
150 struct flowi fl;
151
152 /* BUGGG_FUTURE: Again, it is not clear how
153 to handle rthdr case. Ignore this complexity
154 for now.
155 */
156 memset(&fl, 0, sizeof(fl));
157 fl.proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
159 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
160 fl.oif = sk->sk_bound_dev_if;
161 fl.fl_ip_dport = inet->dport;
162 fl.fl_ip_sport = inet->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700163 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800164
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800167 sk->sk_err_soft = -err;
168 goto out;
169 }
170
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800171 err = xfrm_lookup(&dst, &fl, sk, 0);
172 if (err < 0) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800173 sk->sk_err_soft = -err;
174 goto out;
175 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800176 } else
177 dst_hold(dst);
178
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800180 dccp_sync_mss(sk, dst_mtu(dst));
181 } /* else let the usual retransmit timer handle it */
182 dst_release(dst);
183 goto out;
184 }
185
186 icmpv6_err_convert(type, code, &err);
187
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800188 /* Might be for an request_sock */
189 switch (sk->sk_state) {
190 struct request_sock *req, **prev;
191 case DCCP_LISTEN:
192 if (sock_owned_by_user(sk))
193 goto out;
194
195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
196 &hdr->daddr, &hdr->saddr,
197 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800198 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800199 goto out;
200
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800201 /*
202 * ICMPs are not backlogged, hence we cannot get an established
203 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800204 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700205 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800206
207 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800209 goto out;
210 }
211
212 inet_csk_reqsk_queue_drop(sk, req, prev);
213 goto out;
214
215 case DCCP_REQUESTING:
216 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800217 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800218 if (!sock_owned_by_user(sk)) {
219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220 sk->sk_err = err;
221 /*
222 * Wake people up to see the error
223 * (see connect in sock.c)
224 */
225 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800226 dccp_done(sk);
227 } else
228 sk->sk_err_soft = err;
229 goto out;
230 }
231
232 if (!sock_owned_by_user(sk) && np->recverr) {
233 sk->sk_err = err;
234 sk->sk_error_report(sk);
235 } else
236 sk->sk_err_soft = err;
237
238out:
239 bh_unlock_sock(sk);
240 sock_put(sk);
241}
242
243
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800244static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800245{
246 struct inet6_request_sock *ireq6 = inet6_rsk(req);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sk_buff *skb;
249 struct ipv6_txoptions *opt = NULL;
250 struct in6_addr *final_p = NULL, final;
251 struct flowi fl;
252 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800253 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800254
255 memset(&fl, 0, sizeof(fl));
256 fl.proto = IPPROTO_DCCP;
257 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
258 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
259 fl.fl6_flowlabel = 0;
260 fl.oif = ireq6->iif;
261 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700262 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700263 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800264
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800265 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800266
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800267 if (opt != NULL && opt->srcrt != NULL) {
268 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800269
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800270 ipv6_addr_copy(&final, &fl.fl6_dst);
271 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
272 final_p = &final;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800273 }
274
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800275 err = ip6_dst_lookup(sk, &dst, &fl);
276 if (err)
277 goto done;
278
279 if (final_p)
280 ipv6_addr_copy(&fl.fl6_dst, final_p);
281
282 err = xfrm_lookup(&dst, &fl, sk, 0);
283 if (err < 0)
284 goto done;
285
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800286 skb = dccp_make_response(sk, dst, req);
287 if (skb != NULL) {
288 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800289
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200290 dh->dccph_checksum = dccp_v6_csum_finish(skb,
291 &ireq6->loc_addr,
292 &ireq6->rmt_addr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800293 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
294 err = ip6_xmit(sk, skb, &fl, opt, 0);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200295 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800296 }
297
298done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800299 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800300 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800301 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800302 return err;
303}
304
305static void dccp_v6_reqsk_destructor(struct request_sock *req)
306{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800307 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800308 if (inet6_rsk(req)->pktopts != NULL)
309 kfree_skb(inet6_rsk(req)->pktopts);
310}
311
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800312static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800313{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700314 struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800315 struct sk_buff *skb;
316 struct flowi fl;
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700317 struct net *net = dev_net(rxskb->dst->dev);
318 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800319
Gerrit Renkere356d372007-09-26 14:35:19 -0300320 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800321 return;
322
323 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800324 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800325
Pavel Emelyanov02047742008-04-13 22:32:25 -0700326 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800327 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200328 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800329
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700330 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300331 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
332 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200333
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800334 memset(&fl, 0, sizeof(fl));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700335 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
336 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200337
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800338 fl.proto = IPPROTO_DCCP;
339 fl.oif = inet6_iif(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300340 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
341 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700342 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800343
344 /* sk = NULL, but it is safe for now. RST socket required. */
Pavel Emelyanov02047742008-04-13 22:32:25 -0700345 if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800346 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
Pavel Emelyanov02047742008-04-13 22:32:25 -0700347 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800348 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
349 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
350 return;
351 }
352 }
353
354 kfree_skb(skb);
355}
356
Gerrit Renker73c9e022006-11-10 13:01:31 -0200357static struct request_sock_ops dccp6_request_sock_ops = {
358 .family = AF_INET6,
359 .obj_size = sizeof(struct dccp6_request_sock),
360 .rtx_syn_ack = dccp_v6_send_response,
361 .send_ack = dccp_reqsk_send_ack,
362 .destructor = dccp_v6_reqsk_destructor,
363 .send_reset = dccp_v6_ctl_send_reset,
364};
365
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800366static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
367{
368 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700369 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800370 struct sock *nsk;
371 struct request_sock **prev;
372 /* Find possible connection requests. */
373 struct request_sock *req = inet6_csk_search_req(sk, &prev,
374 dh->dccph_sport,
375 &iph->saddr,
376 &iph->daddr,
377 inet6_iif(skb));
378 if (req != NULL)
379 return dccp_check_req(sk, skb, req, prev);
380
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700381 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800382 &iph->saddr, dh->dccph_sport,
383 &iph->daddr, ntohs(dh->dccph_dport),
384 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800385 if (nsk != NULL) {
386 if (nsk->sk_state != DCCP_TIME_WAIT) {
387 bh_lock_sock(nsk);
388 return nsk;
389 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700390 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800391 return NULL;
392 }
393
394 return sk;
395}
396
397static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
398{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800399 struct request_sock *req;
400 struct dccp_request_sock *dreq;
401 struct inet6_request_sock *ireq6;
402 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200403 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800404 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800405
406 if (skb->protocol == htons(ETH_P_IP))
407 return dccp_v4_conn_request(sk, skb);
408
409 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700410 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800411
412 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700413 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800414 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200415 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800416 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800417 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800418 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700419 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800420 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800421 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800422
423 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
424 goto drop;
425
Gerrit Renker82709532006-10-11 16:26:54 +0100426 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800427 if (req == NULL)
428 goto drop;
429
Gerrit Renkerac757732008-11-04 23:55:49 -0800430 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
431 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800432
Gerrit Renker8b819412007-12-13 12:29:24 -0200433 dreq = dccp_rsk(req);
434 if (dccp_parse_options(sk, dreq, skb))
435 goto drop_and_free;
436
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700437 if (security_inet_conn_request(sk, skb, req))
438 goto drop_and_free;
439
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800440 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700441 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
442 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800443
444 if (ipv6_opt_accepted(sk, skb) ||
445 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
446 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
447 atomic_inc(&skb->users);
448 ireq6->pktopts = skb;
449 }
450 ireq6->iif = sk->sk_bound_dev_if;
451
452 /* So that link locals have meaning */
453 if (!sk->sk_bound_dev_if &&
454 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
455 ireq6->iif = inet6_iif(skb);
456
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800457 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800458 * Step 3: Process LISTEN state
459 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200460 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800461 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200462 * In fact we defer setting S.GSR, S.SWL, S.SWH to
463 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800464 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800465 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200466 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800467 dreq->dreq_service = service;
468
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800469 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800470 goto drop_and_free;
471
472 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
473 return 0;
474
475drop_and_free:
476 reqsk_free(req);
477drop:
478 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800479 return -1;
480}
481
482static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
483 struct sk_buff *skb,
484 struct request_sock *req,
485 struct dst_entry *dst)
486{
487 struct inet6_request_sock *ireq6 = inet6_rsk(req);
488 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
489 struct inet_sock *newinet;
490 struct dccp_sock *newdp;
491 struct dccp6_sock *newdp6;
492 struct sock *newsk;
493 struct ipv6_txoptions *opt;
494
495 if (skb->protocol == htons(ETH_P_IP)) {
496 /*
497 * v6 mapped
498 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800499 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800500 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800501 return NULL;
502
503 newdp6 = (struct dccp6_sock *)newsk;
504 newdp = dccp_sk(newsk);
505 newinet = inet_sk(newsk);
506 newinet->pinet6 = &newdp6->inet6;
507 newnp = inet6_sk(newsk);
508
509 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
510
511 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
512 newinet->daddr);
513
514 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
515 newinet->saddr);
516
517 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
518
519 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
520 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
521 newnp->pktoptions = NULL;
522 newnp->opt = NULL;
523 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700524 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800525
526 /*
527 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
528 * here, dccp_create_openreq_child now does this for us, see the comment in
529 * that function for the gory details. -acme
530 */
531
532 /* It is tricky place. Until this moment IPv4 tcp
533 worked with IPv6 icsk.icsk_af_ops.
534 Sync it now.
535 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800536 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800537
538 return newsk;
539 }
540
541 opt = np->opt;
542
543 if (sk_acceptq_is_full(sk))
544 goto out_overflow;
545
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800546 if (dst == NULL) {
547 struct in6_addr *final_p = NULL, final;
548 struct flowi fl;
549
550 memset(&fl, 0, sizeof(fl));
551 fl.proto = IPPROTO_DCCP;
552 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800553 if (opt != NULL && opt->srcrt != NULL) {
554 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
555
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800556 ipv6_addr_copy(&final, &fl.fl6_dst);
557 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
558 final_p = &final;
559 }
560 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
561 fl.oif = sk->sk_bound_dev_if;
562 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700563 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700564 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800565
566 if (ip6_dst_lookup(sk, &dst, &fl))
567 goto out;
568
569 if (final_p)
570 ipv6_addr_copy(&fl.fl6_dst, final_p);
571
572 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
573 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800574 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800575
576 newsk = dccp_create_openreq_child(sk, req, skb);
577 if (newsk == NULL)
578 goto out;
579
580 /*
581 * No need to charge this sock to the relevant IPv6 refcnt debug socks
582 * count here, dccp_create_openreq_child now does this for us, see the
583 * comment in that function for the gory details. -acme
584 */
585
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700586 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800587 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
588 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800589 newdp6 = (struct dccp6_sock *)newsk;
590 newinet = inet_sk(newsk);
591 newinet->pinet6 = &newdp6->inet6;
592 newdp = dccp_sk(newsk);
593 newnp = inet6_sk(newsk);
594
595 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
596
597 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
598 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
599 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
600 newsk->sk_bound_dev_if = ireq6->iif;
601
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800602 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800603
604 First: no IPv4 options.
605 */
606 newinet->opt = NULL;
607
608 /* Clone RX bits */
609 newnp->rxopt.all = np->rxopt.all;
610
611 /* Clone pktoptions received with SYN */
612 newnp->pktoptions = NULL;
613 if (ireq6->pktopts != NULL) {
614 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
615 kfree_skb(ireq6->pktopts);
616 ireq6->pktopts = NULL;
617 if (newnp->pktoptions)
618 skb_set_owner_r(newnp->pktoptions, newsk);
619 }
620 newnp->opt = NULL;
621 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700622 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800623
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800624 /*
625 * Clone native IPv6 options from listening socket (if any)
626 *
627 * Yes, keeping reference count would be much more clever, but we make
628 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800629 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800630 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800631 newnp->opt = ipv6_dup_options(newsk, opt);
632 if (opt != np->opt)
633 sock_kfree_s(sk, opt, opt->tot_len);
634 }
635
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800636 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800637 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800638 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
639 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800640
641 dccp_sync_mss(newsk, dst_mtu(dst));
642
643 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
644
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800645 __inet6_hash(newsk);
Pavel Emelyanove56d8b82008-04-17 23:17:34 -0700646 __inet_inherit_port(sk, newsk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800647
648 return newsk;
649
650out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700651 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800652out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800654 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800655 sock_kfree_s(sk, opt, opt->tot_len);
656 dst_release(dst);
657 return NULL;
658}
659
660/* The socket must have it's spinlock held when we get
661 * here.
662 *
663 * We have a potential double-lock case here, so even when
664 * doing backlog processing we use the BH locking scheme.
665 * This is because we cannot sleep with the original spinlock
666 * held.
667 */
668static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
669{
670 struct ipv6_pinfo *np = inet6_sk(sk);
671 struct sk_buff *opt_skb = NULL;
672
673 /* Imagine: socket is IPv6. IPv4 packet arrives,
674 goes to IPv4 receive handler and backlogged.
675 From backlog it always goes here. Kerboom...
676 Fortunately, dccp_rcv_established and rcv_established
677 handle them correctly, but it is not case with
678 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
679 */
680
681 if (skb->protocol == htons(ETH_P_IP))
682 return dccp_v4_do_rcv(sk, skb);
683
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700684 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800685 goto discard;
686
687 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800688 * socket locking is here for SMP purposes as backlog rcv is currently
689 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800690 */
691
692 /* Do Stevens' IPV6_PKTOPTIONS.
693
694 Yes, guys, it is the only place in our code, where we
695 may make it not affecting IPv4.
696 The rest of code is protocol independent,
697 and I do not like idea to uglify IPv4.
698
699 Actually, all the idea behind IPV6_PKTOPTIONS
700 looks not very well thought. For now we latch
701 options, received in the last packet, enqueued
702 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900703 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800704 */
705 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200706 /*
707 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
708 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
709 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800710 opt_skb = skb_clone(skb, GFP_ATOMIC);
711
712 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
713 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
714 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700715 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200716 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700717 __kfree_skb(opt_skb);
718 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800719 return 0;
720 }
721
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200722 /*
723 * Step 3: Process LISTEN state
724 * If S.state == LISTEN,
725 * If P.type == Request or P contains a valid Init Cookie option,
726 * (* Must scan the packet's options to check for Init
727 * Cookies. Only Init Cookies are processed here,
728 * however; other options are processed in Step 8. This
729 * scan need only be performed if the endpoint uses Init
730 * Cookies *)
731 * (* Generate a new socket and switch to that socket *)
732 * Set S := new socket for this port pair
733 * S.state = RESPOND
734 * Choose S.ISS (initial seqno) or set from Init Cookies
735 * Initialize S.GAR := S.ISS
736 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
737 * Continue with S.state == RESPOND
738 * (* A Response packet will be generated in Step 11 *)
739 * Otherwise,
740 * Generate Reset(No Connection) unless P.type == Reset
741 * Drop packet and return
742 *
743 * NOTE: the check for the packet types is done in
744 * dccp_rcv_state_process
745 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800746 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800747 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800748
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800749 if (nsk == NULL)
750 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800751 /*
752 * Queue it on the new socket if the new socket is active,
753 * otherwise we just shortcircuit this and continue with
754 * the new socket..
755 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200756 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800757 if (dccp_child_process(sk, nsk, skb))
758 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800759 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800760 __kfree_skb(opt_skb);
761 return 0;
762 }
763 }
764
765 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
766 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700767 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200768 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700769 __kfree_skb(opt_skb);
770 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800771 return 0;
772
773reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800774 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800775discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800776 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800777 __kfree_skb(opt_skb);
778 kfree_skb(skb);
779 return 0;
780}
781
Herbert Xue5bbef22007-10-15 12:50:28 -0700782static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800783{
784 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800785 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200786 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800787
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200788 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800789
790 if (dccp_invalid_packet(skb))
791 goto discard_it;
792
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200793 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700794 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
795 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200796 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200797 goto discard_it;
798 }
799
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800800 dh = dccp_hdr(skb);
801
Gerrit Renkerfde20102007-10-24 10:12:09 -0200802 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800803 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
804
805 if (dccp_packet_without_ack(skb))
806 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
807 else
808 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
809
810 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200811 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700812 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
813 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800814 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800815 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200816 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800817 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200818 if (sk == NULL) {
819 dccp_pr_debug("failed to look up flow ID in table and "
820 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800821 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200822 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800824 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800825 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200826 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800827 * Generate Reset(No Connection) unless P.type == Reset
828 * Drop packet and return
829 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200830 if (sk->sk_state == DCCP_TIME_WAIT) {
831 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
832 inet_twsk_put(inet_twsk(sk));
833 goto no_dccp_socket;
834 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800835
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200836 /*
837 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200838 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
839 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200840 */
841 min_cov = dccp_sk(sk)->dccps_pcrlen;
842 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
843 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
844 dh->dccph_cscov, min_cov);
845 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
846 goto discard_and_relse;
847 }
848
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800849 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
850 goto discard_and_relse;
851
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200852 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800853
854no_dccp_socket:
855 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
856 goto discard_it;
857 /*
858 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200859 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800860 * Generate Reset(No Connection) unless P.type == Reset
861 * Drop packet and return
862 */
863 if (dh->dccph_type != DCCP_PKT_RESET) {
864 DCCP_SKB_CB(skb)->dccpd_reset_code =
865 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800866 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800867 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200868
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800869discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800870 kfree_skb(skb);
871 return 0;
872
873discard_and_relse:
874 sock_put(sk);
875 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800876}
877
Gerrit Renker73c9e022006-11-10 13:01:31 -0200878static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
879 int addr_len)
880{
881 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
882 struct inet_connection_sock *icsk = inet_csk(sk);
883 struct inet_sock *inet = inet_sk(sk);
884 struct ipv6_pinfo *np = inet6_sk(sk);
885 struct dccp_sock *dp = dccp_sk(sk);
886 struct in6_addr *saddr = NULL, *final_p = NULL, final;
887 struct flowi fl;
888 struct dst_entry *dst;
889 int addr_type;
890 int err;
891
892 dp->dccps_role = DCCP_ROLE_CLIENT;
893
894 if (addr_len < SIN6_LEN_RFC2133)
895 return -EINVAL;
896
897 if (usin->sin6_family != AF_INET6)
898 return -EAFNOSUPPORT;
899
900 memset(&fl, 0, sizeof(fl));
901
902 if (np->sndflow) {
903 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
904 IP6_ECN_flow_init(fl.fl6_flowlabel);
905 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
906 struct ip6_flowlabel *flowlabel;
907 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
908 if (flowlabel == NULL)
909 return -EINVAL;
910 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
911 fl6_sock_release(flowlabel);
912 }
913 }
914 /*
915 * connect() to INADDR_ANY means loopback (BSD'ism).
916 */
917 if (ipv6_addr_any(&usin->sin6_addr))
918 usin->sin6_addr.s6_addr[15] = 1;
919
920 addr_type = ipv6_addr_type(&usin->sin6_addr);
921
922 if (addr_type & IPV6_ADDR_MULTICAST)
923 return -ENETUNREACH;
924
925 if (addr_type & IPV6_ADDR_LINKLOCAL) {
926 if (addr_len >= sizeof(struct sockaddr_in6) &&
927 usin->sin6_scope_id) {
928 /* If interface is set while binding, indices
929 * must coincide.
930 */
931 if (sk->sk_bound_dev_if &&
932 sk->sk_bound_dev_if != usin->sin6_scope_id)
933 return -EINVAL;
934
935 sk->sk_bound_dev_if = usin->sin6_scope_id;
936 }
937
938 /* Connect to link-local address requires an interface */
939 if (!sk->sk_bound_dev_if)
940 return -EINVAL;
941 }
942
943 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
944 np->flow_label = fl.fl6_flowlabel;
945
946 /*
947 * DCCP over IPv4
948 */
949 if (addr_type == IPV6_ADDR_MAPPED) {
950 u32 exthdrlen = icsk->icsk_ext_hdr_len;
951 struct sockaddr_in sin;
952
953 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
954
955 if (__ipv6_only_sock(sk))
956 return -ENETUNREACH;
957
958 sin.sin_family = AF_INET;
959 sin.sin_port = usin->sin6_port;
960 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
961
962 icsk->icsk_af_ops = &dccp_ipv6_mapped;
963 sk->sk_backlog_rcv = dccp_v4_do_rcv;
964
965 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
966 if (err) {
967 icsk->icsk_ext_hdr_len = exthdrlen;
968 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
969 sk->sk_backlog_rcv = dccp_v6_do_rcv;
970 goto failure;
971 } else {
972 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
973 inet->saddr);
974 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
975 inet->rcv_saddr);
976 }
977
978 return err;
979 }
980
981 if (!ipv6_addr_any(&np->rcv_saddr))
982 saddr = &np->rcv_saddr;
983
984 fl.proto = IPPROTO_DCCP;
985 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
986 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
987 fl.oif = sk->sk_bound_dev_if;
988 fl.fl_ip_dport = usin->sin6_port;
989 fl.fl_ip_sport = inet->sport;
990 security_sk_classify_flow(sk, &fl);
991
992 if (np->opt != NULL && np->opt->srcrt != NULL) {
993 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
994
995 ipv6_addr_copy(&final, &fl.fl6_dst);
996 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
997 final_p = &final;
998 }
999
1000 err = ip6_dst_lookup(sk, &dst, &fl);
1001 if (err)
1002 goto failure;
1003
1004 if (final_p)
1005 ipv6_addr_copy(&fl.fl6_dst, final_p);
1006
Herbert Xubb728452007-12-12 18:48:58 -08001007 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
David S. Miller14e50e52007-05-24 18:17:54 -07001008 if (err < 0) {
1009 if (err == -EREMOTE)
1010 err = ip6_dst_blackhole(sk, &dst, &fl);
1011 if (err < 0)
1012 goto failure;
1013 }
Gerrit Renker73c9e022006-11-10 13:01:31 -02001014
1015 if (saddr == NULL) {
1016 saddr = &fl.fl6_src;
1017 ipv6_addr_copy(&np->rcv_saddr, saddr);
1018 }
1019
1020 /* set the source address */
1021 ipv6_addr_copy(&np->saddr, saddr);
1022 inet->rcv_saddr = LOOPBACK4_IPV6;
1023
1024 __ip6_dst_store(sk, dst, NULL, NULL);
1025
1026 icsk->icsk_ext_hdr_len = 0;
1027 if (np->opt != NULL)
1028 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1029 np->opt->opt_nflen);
1030
1031 inet->dport = usin->sin6_port;
1032
1033 dccp_set_state(sk, DCCP_REQUESTING);
1034 err = inet6_hash_connect(&dccp_death_row, sk);
1035 if (err)
1036 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -02001037
1038 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1039 np->daddr.s6_addr32,
1040 inet->sport, inet->dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -02001041 err = dccp_connect(sk);
1042 if (err)
1043 goto late_failure;
1044
1045 return 0;
1046
1047late_failure:
1048 dccp_set_state(sk, DCCP_CLOSED);
1049 __sk_dst_reset(sk);
1050failure:
1051 inet->dport = 0;
1052 sk->sk_route_caps = 0;
1053 return err;
1054}
1055
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001056static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001057 .queue_xmit = inet6_csk_xmit,
1058 .send_check = dccp_v6_send_check,
1059 .rebuild_header = inet6_sk_rebuild_header,
1060 .conn_request = dccp_v6_conn_request,
1061 .syn_recv_sock = dccp_v6_request_recv_sock,
1062 .net_header_len = sizeof(struct ipv6hdr),
1063 .setsockopt = ipv6_setsockopt,
1064 .getsockopt = ipv6_getsockopt,
1065 .addr2sockaddr = inet6_csk_addr2sockaddr,
1066 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001067 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001068#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001069 .compat_setsockopt = compat_ipv6_setsockopt,
1070 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001071#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001072};
1073
1074/*
1075 * DCCP over IPv4 via INET6 API
1076 */
1077static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001078 .queue_xmit = ip_queue_xmit,
1079 .send_check = dccp_v4_send_check,
1080 .rebuild_header = inet_sk_rebuild_header,
1081 .conn_request = dccp_v6_conn_request,
1082 .syn_recv_sock = dccp_v6_request_recv_sock,
1083 .net_header_len = sizeof(struct iphdr),
1084 .setsockopt = ipv6_setsockopt,
1085 .getsockopt = ipv6_getsockopt,
1086 .addr2sockaddr = inet6_csk_addr2sockaddr,
1087 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001088#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001089 .compat_setsockopt = compat_ipv6_setsockopt,
1090 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001091#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001092};
1093
1094/* NOTE: A lot of things set to zero explicitly by call to
1095 * sk_alloc() so need not be done here.
1096 */
1097static int dccp_v6_init_sock(struct sock *sk)
1098{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001099 static __u8 dccp_v6_ctl_sock_initialized;
1100 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001101
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001102 if (err == 0) {
1103 if (unlikely(!dccp_v6_ctl_sock_initialized))
1104 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001105 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001106 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001107
1108 return err;
1109}
1110
Brian Haley7d06b2e2008-06-14 17:04:49 -07001111static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001112{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001113 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001114 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001115}
1116
Gerrit Renker73c9e022006-11-10 13:01:31 -02001117static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1118 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1119};
1120
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001121static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001122 .name = "DCCPv6",
1123 .owner = THIS_MODULE,
1124 .close = dccp_close,
1125 .connect = dccp_v6_connect,
1126 .disconnect = dccp_disconnect,
1127 .ioctl = dccp_ioctl,
1128 .init = dccp_v6_init_sock,
1129 .setsockopt = dccp_setsockopt,
1130 .getsockopt = dccp_getsockopt,
1131 .sendmsg = dccp_sendmsg,
1132 .recvmsg = dccp_recvmsg,
1133 .backlog_rcv = dccp_v6_do_rcv,
1134 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001135 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001136 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001137 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001138 .shutdown = dccp_shutdown,
1139 .destroy = dccp_v6_destroy_sock,
1140 .orphan_count = &dccp_orphan_count,
1141 .max_header = MAX_DCCP_HEADER,
1142 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001143 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001144 .rsk_prot = &dccp6_request_sock_ops,
1145 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001146 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001147#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001148 .compat_setsockopt = compat_dccp_setsockopt,
1149 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001150#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001151};
1152
1153static struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001154 .handler = dccp_v6_rcv,
1155 .err_handler = dccp_v6_err,
1156 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001157};
1158
1159static struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001160 .family = PF_INET6,
1161 .owner = THIS_MODULE,
1162 .release = inet6_release,
1163 .bind = inet6_bind,
1164 .connect = inet_stream_connect,
1165 .socketpair = sock_no_socketpair,
1166 .accept = inet_accept,
1167 .getname = inet6_getname,
1168 .poll = dccp_poll,
1169 .ioctl = inet6_ioctl,
1170 .listen = inet_dccp_listen,
1171 .shutdown = inet_shutdown,
1172 .setsockopt = sock_common_setsockopt,
1173 .getsockopt = sock_common_getsockopt,
1174 .sendmsg = inet_sendmsg,
1175 .recvmsg = sock_common_recvmsg,
1176 .mmap = sock_no_mmap,
1177 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001178#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001179 .compat_setsockopt = compat_sock_common_setsockopt,
1180 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001181#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001182};
1183
1184static struct inet_protosw dccp_v6_protosw = {
1185 .type = SOCK_DCCP,
1186 .protocol = IPPROTO_DCCP,
1187 .prot = &dccp_v6_prot,
1188 .ops = &inet6_dccp_ops,
1189 .capability = -1,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001190 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001191};
1192
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001193static int dccp_v6_init_net(struct net *net)
1194{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001195 int err;
1196
1197 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1198 SOCK_DCCP, IPPROTO_DCCP, net);
1199 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001200}
1201
1202static void dccp_v6_exit_net(struct net *net)
1203{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001204 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001205}
1206
1207static struct pernet_operations dccp_v6_ops = {
1208 .init = dccp_v6_init_net,
1209 .exit = dccp_v6_exit_net,
1210};
1211
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001212static int __init dccp_v6_init(void)
1213{
1214 int err = proto_register(&dccp_v6_prot, 1);
1215
1216 if (err != 0)
1217 goto out;
1218
1219 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1220 if (err != 0)
1221 goto out_unregister_proto;
1222
1223 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001224
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001225 err = register_pernet_subsys(&dccp_v6_ops);
1226 if (err != 0)
1227 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001228out:
1229 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001230
1231out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001232 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1233 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001234out_unregister_proto:
1235 proto_unregister(&dccp_v6_prot);
1236 goto out;
1237}
1238
1239static void __exit dccp_v6_exit(void)
1240{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001241 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001242 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1243 inet6_unregister_protosw(&dccp_v6_protosw);
1244 proto_unregister(&dccp_v6_prot);
1245}
1246
1247module_init(dccp_v6_init);
1248module_exit(dccp_v6_exit);
1249
1250/*
1251 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1252 * values directly, Also cover the case where the protocol is not specified,
1253 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1254 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001255MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1256MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001257MODULE_LICENSE("GPL");
1258MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1259MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");