blob: 364bfc76c29eb78c9ae08ced56aa1436c414a685 [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
Stephen Hemminger3b401a82009-09-01 19:25:04 +000038static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080040
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,
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);
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
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800171 err = xfrm_lookup(net, &dst, &fl, sk, 0);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800172 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
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800282 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800283 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;
Eric Dumazetadf30902009-06-02 05:19:30 +0000317 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700318 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000319 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800320
Gerrit Renkere356d372007-09-26 14:35:19 -0300321 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800322 return;
323
324 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800325 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800326
Pavel Emelyanov02047742008-04-13 22:32:25 -0700327 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800328 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200329 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800330
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700331 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300332 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
333 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200334
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800335 memset(&fl, 0, sizeof(fl));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700336 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
337 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200338
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800339 fl.proto = IPPROTO_DCCP;
340 fl.oif = inet6_iif(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300341 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
342 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700343 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800344
345 /* sk = NULL, but it is safe for now. RST socket required. */
Eric Dumazetadf30902009-06-02 05:19:30 +0000346 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
347 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
348 skb_dst_set(skb, dst);
Pavel Emelyanov02047742008-04-13 22:32:25 -0700349 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800350 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
351 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
352 return;
353 }
354 }
355
356 kfree_skb(skb);
357}
358
Gerrit Renker73c9e022006-11-10 13:01:31 -0200359static struct request_sock_ops dccp6_request_sock_ops = {
360 .family = AF_INET6,
361 .obj_size = sizeof(struct dccp6_request_sock),
362 .rtx_syn_ack = dccp_v6_send_response,
363 .send_ack = dccp_reqsk_send_ack,
364 .destructor = dccp_v6_reqsk_destructor,
365 .send_reset = dccp_v6_ctl_send_reset,
366};
367
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800368static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
369{
370 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700371 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800372 struct sock *nsk;
373 struct request_sock **prev;
374 /* Find possible connection requests. */
375 struct request_sock *req = inet6_csk_search_req(sk, &prev,
376 dh->dccph_sport,
377 &iph->saddr,
378 &iph->daddr,
379 inet6_iif(skb));
380 if (req != NULL)
381 return dccp_check_req(sk, skb, req, prev);
382
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700383 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800384 &iph->saddr, dh->dccph_sport,
385 &iph->daddr, ntohs(dh->dccph_dport),
386 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800387 if (nsk != NULL) {
388 if (nsk->sk_state != DCCP_TIME_WAIT) {
389 bh_lock_sock(nsk);
390 return nsk;
391 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700392 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800393 return NULL;
394 }
395
396 return sk;
397}
398
399static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
400{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800401 struct request_sock *req;
402 struct dccp_request_sock *dreq;
403 struct inet6_request_sock *ireq6;
404 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200405 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800406 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800407
408 if (skb->protocol == htons(ETH_P_IP))
409 return dccp_v4_conn_request(sk, skb);
410
411 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700412 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800413
414 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700415 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800416 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200417 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800418 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800419 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800420 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700421 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800422 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800423 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424
425 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
426 goto drop;
427
Gerrit Renker82709532006-10-11 16:26:54 +0100428 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800429 if (req == NULL)
430 goto drop;
431
Gerrit Renkerac757732008-11-04 23:55:49 -0800432 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
433 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800434
Gerrit Renker8b819412007-12-13 12:29:24 -0200435 dreq = dccp_rsk(req);
436 if (dccp_parse_options(sk, dreq, skb))
437 goto drop_and_free;
438
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700439 if (security_inet_conn_request(sk, skb, req))
440 goto drop_and_free;
441
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800442 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700443 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
444 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800445
446 if (ipv6_opt_accepted(sk, skb) ||
447 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
448 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
449 atomic_inc(&skb->users);
450 ireq6->pktopts = skb;
451 }
452 ireq6->iif = sk->sk_bound_dev_if;
453
454 /* So that link locals have meaning */
455 if (!sk->sk_bound_dev_if &&
456 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
457 ireq6->iif = inet6_iif(skb);
458
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800459 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800460 * Step 3: Process LISTEN state
461 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200462 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800463 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200464 * In fact we defer setting S.GSR, S.SWL, S.SWH to
465 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800466 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800467 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200468 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800469 dreq->dreq_service = service;
470
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800471 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800472 goto drop_and_free;
473
474 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
475 return 0;
476
477drop_and_free:
478 reqsk_free(req);
479drop:
480 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800481 return -1;
482}
483
484static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
485 struct sk_buff *skb,
486 struct request_sock *req,
487 struct dst_entry *dst)
488{
489 struct inet6_request_sock *ireq6 = inet6_rsk(req);
490 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
491 struct inet_sock *newinet;
492 struct dccp_sock *newdp;
493 struct dccp6_sock *newdp6;
494 struct sock *newsk;
495 struct ipv6_txoptions *opt;
496
497 if (skb->protocol == htons(ETH_P_IP)) {
498 /*
499 * v6 mapped
500 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800501 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800502 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800503 return NULL;
504
505 newdp6 = (struct dccp6_sock *)newsk;
506 newdp = dccp_sk(newsk);
507 newinet = inet_sk(newsk);
508 newinet->pinet6 = &newdp6->inet6;
509 newnp = inet6_sk(newsk);
510
511 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
512
513 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
514 newinet->daddr);
515
516 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
517 newinet->saddr);
518
519 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
520
521 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
522 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
523 newnp->pktoptions = NULL;
524 newnp->opt = NULL;
525 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700526 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800527
528 /*
529 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
530 * here, dccp_create_openreq_child now does this for us, see the comment in
531 * that function for the gory details. -acme
532 */
533
534 /* It is tricky place. Until this moment IPv4 tcp
535 worked with IPv6 icsk.icsk_af_ops.
536 Sync it now.
537 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800538 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800539
540 return newsk;
541 }
542
543 opt = np->opt;
544
545 if (sk_acceptq_is_full(sk))
546 goto out_overflow;
547
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800548 if (dst == NULL) {
549 struct in6_addr *final_p = NULL, final;
550 struct flowi fl;
551
552 memset(&fl, 0, sizeof(fl));
553 fl.proto = IPPROTO_DCCP;
554 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800555 if (opt != NULL && opt->srcrt != NULL) {
556 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
557
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800558 ipv6_addr_copy(&final, &fl.fl6_dst);
559 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
560 final_p = &final;
561 }
562 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
563 fl.oif = sk->sk_bound_dev_if;
564 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700565 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700566 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800567
568 if (ip6_dst_lookup(sk, &dst, &fl))
569 goto out;
570
571 if (final_p)
572 ipv6_addr_copy(&fl.fl6_dst, final_p);
573
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800574 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800575 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800576 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800577
578 newsk = dccp_create_openreq_child(sk, req, skb);
579 if (newsk == NULL)
580 goto out;
581
582 /*
583 * No need to charge this sock to the relevant IPv6 refcnt debug socks
584 * count here, dccp_create_openreq_child now does this for us, see the
585 * comment in that function for the gory details. -acme
586 */
587
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700588 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800589 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
590 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800591 newdp6 = (struct dccp6_sock *)newsk;
592 newinet = inet_sk(newsk);
593 newinet->pinet6 = &newdp6->inet6;
594 newdp = dccp_sk(newsk);
595 newnp = inet6_sk(newsk);
596
597 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
598
599 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
600 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
601 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
602 newsk->sk_bound_dev_if = ireq6->iif;
603
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800604 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800605
606 First: no IPv4 options.
607 */
608 newinet->opt = NULL;
609
610 /* Clone RX bits */
611 newnp->rxopt.all = np->rxopt.all;
612
613 /* Clone pktoptions received with SYN */
614 newnp->pktoptions = NULL;
615 if (ireq6->pktopts != NULL) {
616 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
617 kfree_skb(ireq6->pktopts);
618 ireq6->pktopts = NULL;
619 if (newnp->pktoptions)
620 skb_set_owner_r(newnp->pktoptions, newsk);
621 }
622 newnp->opt = NULL;
623 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700624 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800625
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800626 /*
627 * Clone native IPv6 options from listening socket (if any)
628 *
629 * Yes, keeping reference count would be much more clever, but we make
630 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800631 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800632 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800633 newnp->opt = ipv6_dup_options(newsk, opt);
634 if (opt != np->opt)
635 sock_kfree_s(sk, opt, opt->tot_len);
636 }
637
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800638 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800639 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800640 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
641 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800642
643 dccp_sync_mss(newsk, dst_mtu(dst));
644
645 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
646
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800647 __inet6_hash(newsk);
Pavel Emelyanove56d8b82008-04-17 23:17:34 -0700648 __inet_inherit_port(sk, newsk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800649
650 return newsk;
651
652out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800654out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700655 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800656 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800657 sock_kfree_s(sk, opt, opt->tot_len);
658 dst_release(dst);
659 return NULL;
660}
661
662/* The socket must have it's spinlock held when we get
663 * here.
664 *
665 * We have a potential double-lock case here, so even when
666 * doing backlog processing we use the BH locking scheme.
667 * This is because we cannot sleep with the original spinlock
668 * held.
669 */
670static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
671{
672 struct ipv6_pinfo *np = inet6_sk(sk);
673 struct sk_buff *opt_skb = NULL;
674
675 /* Imagine: socket is IPv6. IPv4 packet arrives,
676 goes to IPv4 receive handler and backlogged.
677 From backlog it always goes here. Kerboom...
678 Fortunately, dccp_rcv_established and rcv_established
679 handle them correctly, but it is not case with
680 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
681 */
682
683 if (skb->protocol == htons(ETH_P_IP))
684 return dccp_v4_do_rcv(sk, skb);
685
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700686 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800687 goto discard;
688
689 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800690 * socket locking is here for SMP purposes as backlog rcv is currently
691 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800692 */
693
694 /* Do Stevens' IPV6_PKTOPTIONS.
695
696 Yes, guys, it is the only place in our code, where we
697 may make it not affecting IPv4.
698 The rest of code is protocol independent,
699 and I do not like idea to uglify IPv4.
700
701 Actually, all the idea behind IPV6_PKTOPTIONS
702 looks not very well thought. For now we latch
703 options, received in the last packet, enqueued
704 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900705 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800706 */
707 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200708 /*
709 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
710 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
711 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800712 opt_skb = skb_clone(skb, GFP_ATOMIC);
713
714 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
715 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
716 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700717 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200718 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700719 __kfree_skb(opt_skb);
720 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800721 return 0;
722 }
723
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200724 /*
725 * Step 3: Process LISTEN state
726 * If S.state == LISTEN,
727 * If P.type == Request or P contains a valid Init Cookie option,
728 * (* Must scan the packet's options to check for Init
729 * Cookies. Only Init Cookies are processed here,
730 * however; other options are processed in Step 8. This
731 * scan need only be performed if the endpoint uses Init
732 * Cookies *)
733 * (* Generate a new socket and switch to that socket *)
734 * Set S := new socket for this port pair
735 * S.state = RESPOND
736 * Choose S.ISS (initial seqno) or set from Init Cookies
737 * Initialize S.GAR := S.ISS
738 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
739 * Continue with S.state == RESPOND
740 * (* A Response packet will be generated in Step 11 *)
741 * Otherwise,
742 * Generate Reset(No Connection) unless P.type == Reset
743 * Drop packet and return
744 *
745 * NOTE: the check for the packet types is done in
746 * dccp_rcv_state_process
747 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800748 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800749 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800750
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800751 if (nsk == NULL)
752 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800753 /*
754 * Queue it on the new socket if the new socket is active,
755 * otherwise we just shortcircuit this and continue with
756 * the new socket..
757 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200758 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800759 if (dccp_child_process(sk, nsk, skb))
760 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800761 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800762 __kfree_skb(opt_skb);
763 return 0;
764 }
765 }
766
767 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
768 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700769 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200770 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700771 __kfree_skb(opt_skb);
772 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800773 return 0;
774
775reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800776 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800777discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800778 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800779 __kfree_skb(opt_skb);
780 kfree_skb(skb);
781 return 0;
782}
783
Herbert Xue5bbef22007-10-15 12:50:28 -0700784static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800785{
786 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800787 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200788 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800789
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200790 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800791
792 if (dccp_invalid_packet(skb))
793 goto discard_it;
794
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200795 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700796 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
797 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200798 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200799 goto discard_it;
800 }
801
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800802 dh = dccp_hdr(skb);
803
Gerrit Renkerfde20102007-10-24 10:12:09 -0200804 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800805 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
806
807 if (dccp_packet_without_ack(skb))
808 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
809 else
810 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
811
812 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200813 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700814 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
815 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800816 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800817 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200818 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800819 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200820 if (sk == NULL) {
821 dccp_pr_debug("failed to look up flow ID in table and "
822 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200824 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800825
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800826 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800827 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200828 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800829 * Generate Reset(No Connection) unless P.type == Reset
830 * Drop packet and return
831 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200832 if (sk->sk_state == DCCP_TIME_WAIT) {
833 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
834 inet_twsk_put(inet_twsk(sk));
835 goto no_dccp_socket;
836 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800837
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200838 /*
839 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200840 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
841 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200842 */
843 min_cov = dccp_sk(sk)->dccps_pcrlen;
844 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
845 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
846 dh->dccph_cscov, min_cov);
847 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
848 goto discard_and_relse;
849 }
850
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800851 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
852 goto discard_and_relse;
853
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200854 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800855
856no_dccp_socket:
857 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
858 goto discard_it;
859 /*
860 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200861 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800862 * Generate Reset(No Connection) unless P.type == Reset
863 * Drop packet and return
864 */
865 if (dh->dccph_type != DCCP_PKT_RESET) {
866 DCCP_SKB_CB(skb)->dccpd_reset_code =
867 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800868 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800869 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200870
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800871discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800872 kfree_skb(skb);
873 return 0;
874
875discard_and_relse:
876 sock_put(sk);
877 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800878}
879
Gerrit Renker73c9e022006-11-10 13:01:31 -0200880static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
881 int addr_len)
882{
883 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
884 struct inet_connection_sock *icsk = inet_csk(sk);
885 struct inet_sock *inet = inet_sk(sk);
886 struct ipv6_pinfo *np = inet6_sk(sk);
887 struct dccp_sock *dp = dccp_sk(sk);
888 struct in6_addr *saddr = NULL, *final_p = NULL, final;
889 struct flowi fl;
890 struct dst_entry *dst;
891 int addr_type;
892 int err;
893
894 dp->dccps_role = DCCP_ROLE_CLIENT;
895
896 if (addr_len < SIN6_LEN_RFC2133)
897 return -EINVAL;
898
899 if (usin->sin6_family != AF_INET6)
900 return -EAFNOSUPPORT;
901
902 memset(&fl, 0, sizeof(fl));
903
904 if (np->sndflow) {
905 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
906 IP6_ECN_flow_init(fl.fl6_flowlabel);
907 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
908 struct ip6_flowlabel *flowlabel;
909 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
910 if (flowlabel == NULL)
911 return -EINVAL;
912 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
913 fl6_sock_release(flowlabel);
914 }
915 }
916 /*
917 * connect() to INADDR_ANY means loopback (BSD'ism).
918 */
919 if (ipv6_addr_any(&usin->sin6_addr))
920 usin->sin6_addr.s6_addr[15] = 1;
921
922 addr_type = ipv6_addr_type(&usin->sin6_addr);
923
924 if (addr_type & IPV6_ADDR_MULTICAST)
925 return -ENETUNREACH;
926
927 if (addr_type & IPV6_ADDR_LINKLOCAL) {
928 if (addr_len >= sizeof(struct sockaddr_in6) &&
929 usin->sin6_scope_id) {
930 /* If interface is set while binding, indices
931 * must coincide.
932 */
933 if (sk->sk_bound_dev_if &&
934 sk->sk_bound_dev_if != usin->sin6_scope_id)
935 return -EINVAL;
936
937 sk->sk_bound_dev_if = usin->sin6_scope_id;
938 }
939
940 /* Connect to link-local address requires an interface */
941 if (!sk->sk_bound_dev_if)
942 return -EINVAL;
943 }
944
945 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
946 np->flow_label = fl.fl6_flowlabel;
947
948 /*
949 * DCCP over IPv4
950 */
951 if (addr_type == IPV6_ADDR_MAPPED) {
952 u32 exthdrlen = icsk->icsk_ext_hdr_len;
953 struct sockaddr_in sin;
954
955 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
956
957 if (__ipv6_only_sock(sk))
958 return -ENETUNREACH;
959
960 sin.sin_family = AF_INET;
961 sin.sin_port = usin->sin6_port;
962 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
963
964 icsk->icsk_af_ops = &dccp_ipv6_mapped;
965 sk->sk_backlog_rcv = dccp_v4_do_rcv;
966
967 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
968 if (err) {
969 icsk->icsk_ext_hdr_len = exthdrlen;
970 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
971 sk->sk_backlog_rcv = dccp_v6_do_rcv;
972 goto failure;
973 } else {
974 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
975 inet->saddr);
976 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
977 inet->rcv_saddr);
978 }
979
980 return err;
981 }
982
983 if (!ipv6_addr_any(&np->rcv_saddr))
984 saddr = &np->rcv_saddr;
985
986 fl.proto = IPPROTO_DCCP;
987 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
988 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
989 fl.oif = sk->sk_bound_dev_if;
990 fl.fl_ip_dport = usin->sin6_port;
991 fl.fl_ip_sport = inet->sport;
992 security_sk_classify_flow(sk, &fl);
993
994 if (np->opt != NULL && np->opt->srcrt != NULL) {
995 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
996
997 ipv6_addr_copy(&final, &fl.fl6_dst);
998 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
999 final_p = &final;
1000 }
1001
1002 err = ip6_dst_lookup(sk, &dst, &fl);
1003 if (err)
1004 goto failure;
1005
1006 if (final_p)
1007 ipv6_addr_copy(&fl.fl6_dst, final_p);
1008
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001009 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
David S. Miller14e50e52007-05-24 18:17:54 -07001010 if (err < 0) {
1011 if (err == -EREMOTE)
1012 err = ip6_dst_blackhole(sk, &dst, &fl);
1013 if (err < 0)
1014 goto failure;
1015 }
Gerrit Renker73c9e022006-11-10 13:01:31 -02001016
1017 if (saddr == NULL) {
1018 saddr = &fl.fl6_src;
1019 ipv6_addr_copy(&np->rcv_saddr, saddr);
1020 }
1021
1022 /* set the source address */
1023 ipv6_addr_copy(&np->saddr, saddr);
1024 inet->rcv_saddr = LOOPBACK4_IPV6;
1025
1026 __ip6_dst_store(sk, dst, NULL, NULL);
1027
1028 icsk->icsk_ext_hdr_len = 0;
1029 if (np->opt != NULL)
1030 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1031 np->opt->opt_nflen);
1032
1033 inet->dport = usin->sin6_port;
1034
1035 dccp_set_state(sk, DCCP_REQUESTING);
1036 err = inet6_hash_connect(&dccp_death_row, sk);
1037 if (err)
1038 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -02001039
1040 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1041 np->daddr.s6_addr32,
1042 inet->sport, inet->dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -02001043 err = dccp_connect(sk);
1044 if (err)
1045 goto late_failure;
1046
1047 return 0;
1048
1049late_failure:
1050 dccp_set_state(sk, DCCP_CLOSED);
1051 __sk_dst_reset(sk);
1052failure:
1053 inet->dport = 0;
1054 sk->sk_route_caps = 0;
1055 return err;
1056}
1057
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001058static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001059 .queue_xmit = inet6_csk_xmit,
1060 .send_check = dccp_v6_send_check,
1061 .rebuild_header = inet6_sk_rebuild_header,
1062 .conn_request = dccp_v6_conn_request,
1063 .syn_recv_sock = dccp_v6_request_recv_sock,
1064 .net_header_len = sizeof(struct ipv6hdr),
1065 .setsockopt = ipv6_setsockopt,
1066 .getsockopt = ipv6_getsockopt,
1067 .addr2sockaddr = inet6_csk_addr2sockaddr,
1068 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001069 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001070#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001071 .compat_setsockopt = compat_ipv6_setsockopt,
1072 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001073#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001074};
1075
1076/*
1077 * DCCP over IPv4 via INET6 API
1078 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001079static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001080 .queue_xmit = ip_queue_xmit,
1081 .send_check = dccp_v4_send_check,
1082 .rebuild_header = inet_sk_rebuild_header,
1083 .conn_request = dccp_v6_conn_request,
1084 .syn_recv_sock = dccp_v6_request_recv_sock,
1085 .net_header_len = sizeof(struct iphdr),
1086 .setsockopt = ipv6_setsockopt,
1087 .getsockopt = ipv6_getsockopt,
1088 .addr2sockaddr = inet6_csk_addr2sockaddr,
1089 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001090#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001091 .compat_setsockopt = compat_ipv6_setsockopt,
1092 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001093#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001094};
1095
1096/* NOTE: A lot of things set to zero explicitly by call to
1097 * sk_alloc() so need not be done here.
1098 */
1099static int dccp_v6_init_sock(struct sock *sk)
1100{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001101 static __u8 dccp_v6_ctl_sock_initialized;
1102 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001103
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001104 if (err == 0) {
1105 if (unlikely(!dccp_v6_ctl_sock_initialized))
1106 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001107 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001108 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001109
1110 return err;
1111}
1112
Brian Haley7d06b2e2008-06-14 17:04:49 -07001113static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001114{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001115 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001116 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001117}
1118
Gerrit Renker73c9e022006-11-10 13:01:31 -02001119static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1120 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1121};
1122
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001123static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001124 .name = "DCCPv6",
1125 .owner = THIS_MODULE,
1126 .close = dccp_close,
1127 .connect = dccp_v6_connect,
1128 .disconnect = dccp_disconnect,
1129 .ioctl = dccp_ioctl,
1130 .init = dccp_v6_init_sock,
1131 .setsockopt = dccp_setsockopt,
1132 .getsockopt = dccp_getsockopt,
1133 .sendmsg = dccp_sendmsg,
1134 .recvmsg = dccp_recvmsg,
1135 .backlog_rcv = dccp_v6_do_rcv,
1136 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001137 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001138 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001139 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001140 .shutdown = dccp_shutdown,
1141 .destroy = dccp_v6_destroy_sock,
1142 .orphan_count = &dccp_orphan_count,
1143 .max_header = MAX_DCCP_HEADER,
1144 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001145 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001146 .rsk_prot = &dccp6_request_sock_ops,
1147 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001148 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001149#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001150 .compat_setsockopt = compat_dccp_setsockopt,
1151 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001152#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001153};
1154
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001155static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001156 .handler = dccp_v6_rcv,
1157 .err_handler = dccp_v6_err,
1158 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001159};
1160
1161static struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001162 .family = PF_INET6,
1163 .owner = THIS_MODULE,
1164 .release = inet6_release,
1165 .bind = inet6_bind,
1166 .connect = inet_stream_connect,
1167 .socketpair = sock_no_socketpair,
1168 .accept = inet_accept,
1169 .getname = inet6_getname,
1170 .poll = dccp_poll,
1171 .ioctl = inet6_ioctl,
1172 .listen = inet_dccp_listen,
1173 .shutdown = inet_shutdown,
1174 .setsockopt = sock_common_setsockopt,
1175 .getsockopt = sock_common_getsockopt,
1176 .sendmsg = inet_sendmsg,
1177 .recvmsg = sock_common_recvmsg,
1178 .mmap = sock_no_mmap,
1179 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001180#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001181 .compat_setsockopt = compat_sock_common_setsockopt,
1182 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001183#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001184};
1185
1186static struct inet_protosw dccp_v6_protosw = {
1187 .type = SOCK_DCCP,
1188 .protocol = IPPROTO_DCCP,
1189 .prot = &dccp_v6_prot,
1190 .ops = &inet6_dccp_ops,
1191 .capability = -1,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001192 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001193};
1194
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001195static int dccp_v6_init_net(struct net *net)
1196{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001197 int err;
1198
1199 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1200 SOCK_DCCP, IPPROTO_DCCP, net);
1201 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001202}
1203
1204static void dccp_v6_exit_net(struct net *net)
1205{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001206 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001207}
1208
1209static struct pernet_operations dccp_v6_ops = {
1210 .init = dccp_v6_init_net,
1211 .exit = dccp_v6_exit_net,
1212};
1213
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001214static int __init dccp_v6_init(void)
1215{
1216 int err = proto_register(&dccp_v6_prot, 1);
1217
1218 if (err != 0)
1219 goto out;
1220
1221 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1222 if (err != 0)
1223 goto out_unregister_proto;
1224
1225 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001226
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001227 err = register_pernet_subsys(&dccp_v6_ops);
1228 if (err != 0)
1229 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001230out:
1231 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001232
1233out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001234 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1235 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001236out_unregister_proto:
1237 proto_unregister(&dccp_v6_prot);
1238 goto out;
1239}
1240
1241static void __exit dccp_v6_exit(void)
1242{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001243 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001244 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1245 inet6_unregister_protosw(&dccp_v6_protosw);
1246 proto_unregister(&dccp_v6_prot);
1247}
1248
1249module_init(dccp_v6_init);
1250module_exit(dccp_v6_exit);
1251
1252/*
1253 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1254 * values directly, Also cover the case where the protocol is not specified,
1255 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1256 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001257MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1258MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001259MODULE_LICENSE("GPL");
1260MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1261MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");