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Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001/*
2 * DCCP over IPv6
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08003 * Linux INET6 implementation
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08004 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080015#include <linux/module.h>
16#include <linux/random.h>
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)) {
101 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
102 return;
103 }
104
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -0700105 sk = inet6_lookup(net, &dccp_hashinfo,
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700106 &hdr->daddr, dh->dccph_dport,
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800107 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800108
109 if (sk == NULL) {
110 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
111 return;
112 }
113
114 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700115 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800116 return;
117 }
118
119 bh_lock_sock(sk);
120 if (sock_owned_by_user(sk))
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700121 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800122
123 if (sk->sk_state == DCCP_CLOSED)
124 goto out;
125
Wei Yongjune0bcfb02008-07-26 11:59:10 +0100126 dp = dccp_sk(sk);
127 seq = dccp_hdr_seq(dh);
128 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
129 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
130 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
131 goto out;
132 }
133
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800134 np = inet6_sk(sk);
135
136 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800137 struct dst_entry *dst = NULL;
138
139 if (sock_owned_by_user(sk))
140 goto out;
141 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
142 goto out;
143
144 /* icmp should have updated the destination cache entry */
145 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800146 if (dst == NULL) {
147 struct inet_sock *inet = inet_sk(sk);
148 struct flowi fl;
149
150 /* BUGGG_FUTURE: Again, it is not clear how
151 to handle rthdr case. Ignore this complexity
152 for now.
153 */
154 memset(&fl, 0, sizeof(fl));
155 fl.proto = IPPROTO_DCCP;
156 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
157 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
158 fl.oif = sk->sk_bound_dev_if;
159 fl.fl_ip_dport = inet->dport;
160 fl.fl_ip_sport = inet->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700161 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800162
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800163 err = ip6_dst_lookup(sk, &dst, &fl);
164 if (err) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800165 sk->sk_err_soft = -err;
166 goto out;
167 }
168
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800169 err = xfrm_lookup(&dst, &fl, sk, 0);
170 if (err < 0) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800171 sk->sk_err_soft = -err;
172 goto out;
173 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800174 } else
175 dst_hold(dst);
176
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800177 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800178 dccp_sync_mss(sk, dst_mtu(dst));
179 } /* else let the usual retransmit timer handle it */
180 dst_release(dst);
181 goto out;
182 }
183
184 icmpv6_err_convert(type, code, &err);
185
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800186 /* Might be for an request_sock */
187 switch (sk->sk_state) {
188 struct request_sock *req, **prev;
189 case DCCP_LISTEN:
190 if (sock_owned_by_user(sk))
191 goto out;
192
193 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
194 &hdr->daddr, &hdr->saddr,
195 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800196 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800197 goto out;
198
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800199 /*
200 * ICMPs are not backlogged, hence we cannot get an established
201 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800202 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700203 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800204
205 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700206 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800207 goto out;
208 }
209
210 inet_csk_reqsk_queue_drop(sk, req, prev);
211 goto out;
212
213 case DCCP_REQUESTING:
214 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800215 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800216 if (!sock_owned_by_user(sk)) {
217 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
218 sk->sk_err = err;
219 /*
220 * Wake people up to see the error
221 * (see connect in sock.c)
222 */
223 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800224 dccp_done(sk);
225 } else
226 sk->sk_err_soft = err;
227 goto out;
228 }
229
230 if (!sock_owned_by_user(sk) && np->recverr) {
231 sk->sk_err = err;
232 sk->sk_error_report(sk);
233 } else
234 sk->sk_err_soft = err;
235
236out:
237 bh_unlock_sock(sk);
238 sock_put(sk);
239}
240
241
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800242static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800243{
244 struct inet6_request_sock *ireq6 = inet6_rsk(req);
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sk_buff *skb;
247 struct ipv6_txoptions *opt = NULL;
248 struct in6_addr *final_p = NULL, final;
249 struct flowi fl;
250 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800251 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800252
253 memset(&fl, 0, sizeof(fl));
254 fl.proto = IPPROTO_DCCP;
255 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
256 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
257 fl.fl6_flowlabel = 0;
258 fl.oif = ireq6->iif;
259 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
260 fl.fl_ip_sport = inet_sk(sk)->sport;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700261 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800262
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800263 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800264
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800265 if (opt != NULL && opt->srcrt != NULL) {
266 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800267
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800268 ipv6_addr_copy(&final, &fl.fl6_dst);
269 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
270 final_p = &final;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800271 }
272
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800273 err = ip6_dst_lookup(sk, &dst, &fl);
274 if (err)
275 goto done;
276
277 if (final_p)
278 ipv6_addr_copy(&fl.fl6_dst, final_p);
279
280 err = xfrm_lookup(&dst, &fl, sk, 0);
281 if (err < 0)
282 goto done;
283
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800284 skb = dccp_make_response(sk, dst, req);
285 if (skb != NULL) {
286 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800287
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200288 dh->dccph_checksum = dccp_v6_csum_finish(skb,
289 &ireq6->loc_addr,
290 &ireq6->rmt_addr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800291 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
292 err = ip6_xmit(sk, skb, &fl, opt, 0);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200293 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800294 }
295
296done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800297 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800298 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800299 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800300 return err;
301}
302
303static void dccp_v6_reqsk_destructor(struct request_sock *req)
304{
305 if (inet6_rsk(req)->pktopts != NULL)
306 kfree_skb(inet6_rsk(req)->pktopts);
307}
308
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800309static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800310{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700311 struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800312 struct sk_buff *skb;
313 struct flowi fl;
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700314 struct net *net = dev_net(rxskb->dst->dev);
315 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800316
Gerrit Renkere356d372007-09-26 14:35:19 -0300317 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800318 return;
319
320 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800321 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800322
Pavel Emelyanov02047742008-04-13 22:32:25 -0700323 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800324 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200325 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800326
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700327 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300328 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
329 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200330
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800331 memset(&fl, 0, sizeof(fl));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700332 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
333 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200334
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800335 fl.proto = IPPROTO_DCCP;
336 fl.oif = inet6_iif(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300337 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
338 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700339 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800340
341 /* sk = NULL, but it is safe for now. RST socket required. */
Pavel Emelyanov02047742008-04-13 22:32:25 -0700342 if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800343 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
Pavel Emelyanov02047742008-04-13 22:32:25 -0700344 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800345 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
346 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
347 return;
348 }
349 }
350
351 kfree_skb(skb);
352}
353
Gerrit Renker73c9e022006-11-10 13:01:31 -0200354static struct request_sock_ops dccp6_request_sock_ops = {
355 .family = AF_INET6,
356 .obj_size = sizeof(struct dccp6_request_sock),
357 .rtx_syn_ack = dccp_v6_send_response,
358 .send_ack = dccp_reqsk_send_ack,
359 .destructor = dccp_v6_reqsk_destructor,
360 .send_reset = dccp_v6_ctl_send_reset,
361};
362
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800363static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
364{
365 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700366 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800367 struct sock *nsk;
368 struct request_sock **prev;
369 /* Find possible connection requests. */
370 struct request_sock *req = inet6_csk_search_req(sk, &prev,
371 dh->dccph_sport,
372 &iph->saddr,
373 &iph->daddr,
374 inet6_iif(skb));
375 if (req != NULL)
376 return dccp_check_req(sk, skb, req, prev);
377
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700378 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800379 &iph->saddr, dh->dccph_sport,
380 &iph->daddr, ntohs(dh->dccph_dport),
381 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800382 if (nsk != NULL) {
383 if (nsk->sk_state != DCCP_TIME_WAIT) {
384 bh_lock_sock(nsk);
385 return nsk;
386 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700387 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800388 return NULL;
389 }
390
391 return sk;
392}
393
394static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
395{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800396 struct request_sock *req;
397 struct dccp_request_sock *dreq;
398 struct inet6_request_sock *ireq6;
399 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200400 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800401 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800402
403 if (skb->protocol == htons(ETH_P_IP))
404 return dccp_v4_conn_request(sk, skb);
405
406 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700407 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800408
409 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700410 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800411 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200412 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800413 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800414 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800415 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700416 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800417 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800418 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800419
420 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
421 goto drop;
422
Gerrit Renker82709532006-10-11 16:26:54 +0100423 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424 if (req == NULL)
425 goto drop;
426
Gerrit Renkercf557922006-11-10 16:08:37 -0200427 dccp_reqsk_init(req, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800428
Gerrit Renker8b819412007-12-13 12:29:24 -0200429 dreq = dccp_rsk(req);
430 if (dccp_parse_options(sk, dreq, skb))
431 goto drop_and_free;
432
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700433 if (security_inet_conn_request(sk, skb, req))
434 goto drop_and_free;
435
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800436 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700437 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
438 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800439
440 if (ipv6_opt_accepted(sk, skb) ||
441 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
442 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
443 atomic_inc(&skb->users);
444 ireq6->pktopts = skb;
445 }
446 ireq6->iif = sk->sk_bound_dev_if;
447
448 /* So that link locals have meaning */
449 if (!sk->sk_bound_dev_if &&
450 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
451 ireq6->iif = inet6_iif(skb);
452
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800453 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800454 * Step 3: Process LISTEN state
455 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200456 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800457 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200458 * In fact we defer setting S.GSR, S.SWL, S.SWH to
459 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800460 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800461 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200462 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800463 dreq->dreq_service = service;
464
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800465 if (dccp_v6_send_response(sk, req))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800466 goto drop_and_free;
467
468 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
469 return 0;
470
471drop_and_free:
472 reqsk_free(req);
473drop:
474 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800475 return -1;
476}
477
478static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
479 struct sk_buff *skb,
480 struct request_sock *req,
481 struct dst_entry *dst)
482{
483 struct inet6_request_sock *ireq6 = inet6_rsk(req);
484 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
485 struct inet_sock *newinet;
486 struct dccp_sock *newdp;
487 struct dccp6_sock *newdp6;
488 struct sock *newsk;
489 struct ipv6_txoptions *opt;
490
491 if (skb->protocol == htons(ETH_P_IP)) {
492 /*
493 * v6 mapped
494 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800495 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800496 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800497 return NULL;
498
499 newdp6 = (struct dccp6_sock *)newsk;
500 newdp = dccp_sk(newsk);
501 newinet = inet_sk(newsk);
502 newinet->pinet6 = &newdp6->inet6;
503 newnp = inet6_sk(newsk);
504
505 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
506
507 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
508 newinet->daddr);
509
510 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
511 newinet->saddr);
512
513 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
514
515 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
516 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
517 newnp->pktoptions = NULL;
518 newnp->opt = NULL;
519 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700520 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800521
522 /*
523 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
524 * here, dccp_create_openreq_child now does this for us, see the comment in
525 * that function for the gory details. -acme
526 */
527
528 /* It is tricky place. Until this moment IPv4 tcp
529 worked with IPv6 icsk.icsk_af_ops.
530 Sync it now.
531 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800532 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800533
534 return newsk;
535 }
536
537 opt = np->opt;
538
539 if (sk_acceptq_is_full(sk))
540 goto out_overflow;
541
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800542 if (dst == NULL) {
543 struct in6_addr *final_p = NULL, final;
544 struct flowi fl;
545
546 memset(&fl, 0, sizeof(fl));
547 fl.proto = IPPROTO_DCCP;
548 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800549 if (opt != NULL && opt->srcrt != NULL) {
550 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
551
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800552 ipv6_addr_copy(&final, &fl.fl6_dst);
553 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
554 final_p = &final;
555 }
556 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
557 fl.oif = sk->sk_bound_dev_if;
558 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
559 fl.fl_ip_sport = inet_sk(sk)->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700560 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800561
562 if (ip6_dst_lookup(sk, &dst, &fl))
563 goto out;
564
565 if (final_p)
566 ipv6_addr_copy(&fl.fl6_dst, final_p);
567
568 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
569 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800570 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800571
572 newsk = dccp_create_openreq_child(sk, req, skb);
573 if (newsk == NULL)
574 goto out;
575
576 /*
577 * No need to charge this sock to the relevant IPv6 refcnt debug socks
578 * count here, dccp_create_openreq_child now does this for us, see the
579 * comment in that function for the gory details. -acme
580 */
581
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700582 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800583 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
584 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800585 newdp6 = (struct dccp6_sock *)newsk;
586 newinet = inet_sk(newsk);
587 newinet->pinet6 = &newdp6->inet6;
588 newdp = dccp_sk(newsk);
589 newnp = inet6_sk(newsk);
590
591 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
592
593 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
594 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
595 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
596 newsk->sk_bound_dev_if = ireq6->iif;
597
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800598 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800599
600 First: no IPv4 options.
601 */
602 newinet->opt = NULL;
603
604 /* Clone RX bits */
605 newnp->rxopt.all = np->rxopt.all;
606
607 /* Clone pktoptions received with SYN */
608 newnp->pktoptions = NULL;
609 if (ireq6->pktopts != NULL) {
610 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
611 kfree_skb(ireq6->pktopts);
612 ireq6->pktopts = NULL;
613 if (newnp->pktoptions)
614 skb_set_owner_r(newnp->pktoptions, newsk);
615 }
616 newnp->opt = NULL;
617 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700618 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800619
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800620 /*
621 * Clone native IPv6 options from listening socket (if any)
622 *
623 * Yes, keeping reference count would be much more clever, but we make
624 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800625 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800626 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800627 newnp->opt = ipv6_dup_options(newsk, opt);
628 if (opt != np->opt)
629 sock_kfree_s(sk, opt, opt->tot_len);
630 }
631
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800632 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800633 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800634 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
635 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800636
637 dccp_sync_mss(newsk, dst_mtu(dst));
638
639 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
640
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800641 __inet6_hash(newsk);
Pavel Emelyanove56d8b82008-04-17 23:17:34 -0700642 __inet_inherit_port(sk, newsk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800643
644 return newsk;
645
646out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700647 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800648out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700649 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800650 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800651 sock_kfree_s(sk, opt, opt->tot_len);
652 dst_release(dst);
653 return NULL;
654}
655
656/* The socket must have it's spinlock held when we get
657 * here.
658 *
659 * We have a potential double-lock case here, so even when
660 * doing backlog processing we use the BH locking scheme.
661 * This is because we cannot sleep with the original spinlock
662 * held.
663 */
664static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
665{
666 struct ipv6_pinfo *np = inet6_sk(sk);
667 struct sk_buff *opt_skb = NULL;
668
669 /* Imagine: socket is IPv6. IPv4 packet arrives,
670 goes to IPv4 receive handler and backlogged.
671 From backlog it always goes here. Kerboom...
672 Fortunately, dccp_rcv_established and rcv_established
673 handle them correctly, but it is not case with
674 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
675 */
676
677 if (skb->protocol == htons(ETH_P_IP))
678 return dccp_v4_do_rcv(sk, skb);
679
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700680 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800681 goto discard;
682
683 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800684 * socket locking is here for SMP purposes as backlog rcv is currently
685 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800686 */
687
688 /* Do Stevens' IPV6_PKTOPTIONS.
689
690 Yes, guys, it is the only place in our code, where we
691 may make it not affecting IPv4.
692 The rest of code is protocol independent,
693 and I do not like idea to uglify IPv4.
694
695 Actually, all the idea behind IPV6_PKTOPTIONS
696 looks not very well thought. For now we latch
697 options, received in the last packet, enqueued
698 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900699 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800700 */
701 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200702 /*
703 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
704 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
705 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800706 opt_skb = skb_clone(skb, GFP_ATOMIC);
707
708 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
709 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
710 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700711 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200712 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700713 __kfree_skb(opt_skb);
714 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800715 return 0;
716 }
717
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200718 /*
719 * Step 3: Process LISTEN state
720 * If S.state == LISTEN,
721 * If P.type == Request or P contains a valid Init Cookie option,
722 * (* Must scan the packet's options to check for Init
723 * Cookies. Only Init Cookies are processed here,
724 * however; other options are processed in Step 8. This
725 * scan need only be performed if the endpoint uses Init
726 * Cookies *)
727 * (* Generate a new socket and switch to that socket *)
728 * Set S := new socket for this port pair
729 * S.state = RESPOND
730 * Choose S.ISS (initial seqno) or set from Init Cookies
731 * Initialize S.GAR := S.ISS
732 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
733 * Continue with S.state == RESPOND
734 * (* A Response packet will be generated in Step 11 *)
735 * Otherwise,
736 * Generate Reset(No Connection) unless P.type == Reset
737 * Drop packet and return
738 *
739 * NOTE: the check for the packet types is done in
740 * dccp_rcv_state_process
741 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800742 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800743 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800744
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800745 if (nsk == NULL)
746 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800747 /*
748 * Queue it on the new socket if the new socket is active,
749 * otherwise we just shortcircuit this and continue with
750 * the new socket..
751 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200752 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800753 if (dccp_child_process(sk, nsk, skb))
754 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800755 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800756 __kfree_skb(opt_skb);
757 return 0;
758 }
759 }
760
761 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
762 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700763 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200764 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700765 __kfree_skb(opt_skb);
766 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800767 return 0;
768
769reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800770 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800771discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800772 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800773 __kfree_skb(opt_skb);
774 kfree_skb(skb);
775 return 0;
776}
777
Herbert Xue5bbef22007-10-15 12:50:28 -0700778static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800779{
780 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800781 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200782 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800783
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200784 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800785
786 if (dccp_invalid_packet(skb))
787 goto discard_it;
788
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200789 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700790 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
791 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200792 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200793 goto discard_it;
794 }
795
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800796 dh = dccp_hdr(skb);
797
Gerrit Renkerfde20102007-10-24 10:12:09 -0200798 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800799 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
800
801 if (dccp_packet_without_ack(skb))
802 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
803 else
804 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
805
806 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200807 * Look up flow ID in table and get corresponding socket */
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700808 sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
809 &ipv6_hdr(skb)->saddr, dh->dccph_sport,
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700810 &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800811 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800812 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800813 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200814 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800815 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200816 if (sk == NULL) {
817 dccp_pr_debug("failed to look up flow ID in table and "
818 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800819 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200820 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800821
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800822 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200824 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800825 * Generate Reset(No Connection) unless P.type == Reset
826 * Drop packet and return
827 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200828 if (sk->sk_state == DCCP_TIME_WAIT) {
829 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
830 inet_twsk_put(inet_twsk(sk));
831 goto no_dccp_socket;
832 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800833
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200834 /*
835 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200836 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
837 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200838 */
839 min_cov = dccp_sk(sk)->dccps_pcrlen;
840 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
841 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
842 dh->dccph_cscov, min_cov);
843 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
844 goto discard_and_relse;
845 }
846
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800847 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
848 goto discard_and_relse;
849
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200850 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800851
852no_dccp_socket:
853 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
854 goto discard_it;
855 /*
856 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200857 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800858 * Generate Reset(No Connection) unless P.type == Reset
859 * Drop packet and return
860 */
861 if (dh->dccph_type != DCCP_PKT_RESET) {
862 DCCP_SKB_CB(skb)->dccpd_reset_code =
863 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800864 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800865 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200866
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800867discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800868 kfree_skb(skb);
869 return 0;
870
871discard_and_relse:
872 sock_put(sk);
873 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800874}
875
Gerrit Renker73c9e022006-11-10 13:01:31 -0200876static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
877 int addr_len)
878{
879 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
880 struct inet_connection_sock *icsk = inet_csk(sk);
881 struct inet_sock *inet = inet_sk(sk);
882 struct ipv6_pinfo *np = inet6_sk(sk);
883 struct dccp_sock *dp = dccp_sk(sk);
884 struct in6_addr *saddr = NULL, *final_p = NULL, final;
885 struct flowi fl;
886 struct dst_entry *dst;
887 int addr_type;
888 int err;
889
890 dp->dccps_role = DCCP_ROLE_CLIENT;
891
892 if (addr_len < SIN6_LEN_RFC2133)
893 return -EINVAL;
894
895 if (usin->sin6_family != AF_INET6)
896 return -EAFNOSUPPORT;
897
898 memset(&fl, 0, sizeof(fl));
899
900 if (np->sndflow) {
901 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
902 IP6_ECN_flow_init(fl.fl6_flowlabel);
903 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
904 struct ip6_flowlabel *flowlabel;
905 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
906 if (flowlabel == NULL)
907 return -EINVAL;
908 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
909 fl6_sock_release(flowlabel);
910 }
911 }
912 /*
913 * connect() to INADDR_ANY means loopback (BSD'ism).
914 */
915 if (ipv6_addr_any(&usin->sin6_addr))
916 usin->sin6_addr.s6_addr[15] = 1;
917
918 addr_type = ipv6_addr_type(&usin->sin6_addr);
919
920 if (addr_type & IPV6_ADDR_MULTICAST)
921 return -ENETUNREACH;
922
923 if (addr_type & IPV6_ADDR_LINKLOCAL) {
924 if (addr_len >= sizeof(struct sockaddr_in6) &&
925 usin->sin6_scope_id) {
926 /* If interface is set while binding, indices
927 * must coincide.
928 */
929 if (sk->sk_bound_dev_if &&
930 sk->sk_bound_dev_if != usin->sin6_scope_id)
931 return -EINVAL;
932
933 sk->sk_bound_dev_if = usin->sin6_scope_id;
934 }
935
936 /* Connect to link-local address requires an interface */
937 if (!sk->sk_bound_dev_if)
938 return -EINVAL;
939 }
940
941 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
942 np->flow_label = fl.fl6_flowlabel;
943
944 /*
945 * DCCP over IPv4
946 */
947 if (addr_type == IPV6_ADDR_MAPPED) {
948 u32 exthdrlen = icsk->icsk_ext_hdr_len;
949 struct sockaddr_in sin;
950
951 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
952
953 if (__ipv6_only_sock(sk))
954 return -ENETUNREACH;
955
956 sin.sin_family = AF_INET;
957 sin.sin_port = usin->sin6_port;
958 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
959
960 icsk->icsk_af_ops = &dccp_ipv6_mapped;
961 sk->sk_backlog_rcv = dccp_v4_do_rcv;
962
963 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
964 if (err) {
965 icsk->icsk_ext_hdr_len = exthdrlen;
966 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
967 sk->sk_backlog_rcv = dccp_v6_do_rcv;
968 goto failure;
969 } else {
970 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
971 inet->saddr);
972 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
973 inet->rcv_saddr);
974 }
975
976 return err;
977 }
978
979 if (!ipv6_addr_any(&np->rcv_saddr))
980 saddr = &np->rcv_saddr;
981
982 fl.proto = IPPROTO_DCCP;
983 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
984 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
985 fl.oif = sk->sk_bound_dev_if;
986 fl.fl_ip_dport = usin->sin6_port;
987 fl.fl_ip_sport = inet->sport;
988 security_sk_classify_flow(sk, &fl);
989
990 if (np->opt != NULL && np->opt->srcrt != NULL) {
991 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
992
993 ipv6_addr_copy(&final, &fl.fl6_dst);
994 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
995 final_p = &final;
996 }
997
998 err = ip6_dst_lookup(sk, &dst, &fl);
999 if (err)
1000 goto failure;
1001
1002 if (final_p)
1003 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
Herbert Xubb728452007-12-12 18:48:58 -08001005 err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
David S. Miller14e50e52007-05-24 18:17:54 -07001006 if (err < 0) {
1007 if (err == -EREMOTE)
1008 err = ip6_dst_blackhole(sk, &dst, &fl);
1009 if (err < 0)
1010 goto failure;
1011 }
Gerrit Renker73c9e022006-11-10 13:01:31 -02001012
1013 if (saddr == NULL) {
1014 saddr = &fl.fl6_src;
1015 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016 }
1017
1018 /* set the source address */
1019 ipv6_addr_copy(&np->saddr, saddr);
1020 inet->rcv_saddr = LOOPBACK4_IPV6;
1021
1022 __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024 icsk->icsk_ext_hdr_len = 0;
1025 if (np->opt != NULL)
1026 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027 np->opt->opt_nflen);
1028
1029 inet->dport = usin->sin6_port;
1030
1031 dccp_set_state(sk, DCCP_REQUESTING);
1032 err = inet6_hash_connect(&dccp_death_row, sk);
1033 if (err)
1034 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -02001035
1036 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037 np->daddr.s6_addr32,
1038 inet->sport, inet->dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -02001039 err = dccp_connect(sk);
1040 if (err)
1041 goto late_failure;
1042
1043 return 0;
1044
1045late_failure:
1046 dccp_set_state(sk, DCCP_CLOSED);
1047 __sk_dst_reset(sk);
1048failure:
1049 inet->dport = 0;
1050 sk->sk_route_caps = 0;
1051 return err;
1052}
1053
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001054static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001055 .queue_xmit = inet6_csk_xmit,
1056 .send_check = dccp_v6_send_check,
1057 .rebuild_header = inet6_sk_rebuild_header,
1058 .conn_request = dccp_v6_conn_request,
1059 .syn_recv_sock = dccp_v6_request_recv_sock,
1060 .net_header_len = sizeof(struct ipv6hdr),
1061 .setsockopt = ipv6_setsockopt,
1062 .getsockopt = ipv6_getsockopt,
1063 .addr2sockaddr = inet6_csk_addr2sockaddr,
1064 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001065 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001066#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001067 .compat_setsockopt = compat_ipv6_setsockopt,
1068 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001069#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001070};
1071
1072/*
1073 * DCCP over IPv4 via INET6 API
1074 */
1075static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001076 .queue_xmit = ip_queue_xmit,
1077 .send_check = dccp_v4_send_check,
1078 .rebuild_header = inet_sk_rebuild_header,
1079 .conn_request = dccp_v6_conn_request,
1080 .syn_recv_sock = dccp_v6_request_recv_sock,
1081 .net_header_len = sizeof(struct iphdr),
1082 .setsockopt = ipv6_setsockopt,
1083 .getsockopt = ipv6_getsockopt,
1084 .addr2sockaddr = inet6_csk_addr2sockaddr,
1085 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001086#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001087 .compat_setsockopt = compat_ipv6_setsockopt,
1088 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001089#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001090};
1091
1092/* NOTE: A lot of things set to zero explicitly by call to
1093 * sk_alloc() so need not be done here.
1094 */
1095static int dccp_v6_init_sock(struct sock *sk)
1096{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001097 static __u8 dccp_v6_ctl_sock_initialized;
1098 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001099
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001100 if (err == 0) {
1101 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001103 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001104 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001105
1106 return err;
1107}
1108
Brian Haley7d06b2e2008-06-14 17:04:49 -07001109static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001110{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001111 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001112 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001113}
1114
Gerrit Renker73c9e022006-11-10 13:01:31 -02001115static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1117};
1118
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001119static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001120 .name = "DCCPv6",
1121 .owner = THIS_MODULE,
1122 .close = dccp_close,
1123 .connect = dccp_v6_connect,
1124 .disconnect = dccp_disconnect,
1125 .ioctl = dccp_ioctl,
1126 .init = dccp_v6_init_sock,
1127 .setsockopt = dccp_setsockopt,
1128 .getsockopt = dccp_getsockopt,
1129 .sendmsg = dccp_sendmsg,
1130 .recvmsg = dccp_recvmsg,
1131 .backlog_rcv = dccp_v6_do_rcv,
1132 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001133 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001134 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001135 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001136 .shutdown = dccp_shutdown,
1137 .destroy = dccp_v6_destroy_sock,
1138 .orphan_count = &dccp_orphan_count,
1139 .max_header = MAX_DCCP_HEADER,
1140 .obj_size = sizeof(struct dccp6_sock),
1141 .rsk_prot = &dccp6_request_sock_ops,
1142 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001143 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001144#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001145 .compat_setsockopt = compat_dccp_setsockopt,
1146 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001147#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001148};
1149
1150static struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001151 .handler = dccp_v6_rcv,
1152 .err_handler = dccp_v6_err,
1153 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001154};
1155
1156static struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001157 .family = PF_INET6,
1158 .owner = THIS_MODULE,
1159 .release = inet6_release,
1160 .bind = inet6_bind,
1161 .connect = inet_stream_connect,
1162 .socketpair = sock_no_socketpair,
1163 .accept = inet_accept,
1164 .getname = inet6_getname,
1165 .poll = dccp_poll,
1166 .ioctl = inet6_ioctl,
1167 .listen = inet_dccp_listen,
1168 .shutdown = inet_shutdown,
1169 .setsockopt = sock_common_setsockopt,
1170 .getsockopt = sock_common_getsockopt,
1171 .sendmsg = inet_sendmsg,
1172 .recvmsg = sock_common_recvmsg,
1173 .mmap = sock_no_mmap,
1174 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001175#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001176 .compat_setsockopt = compat_sock_common_setsockopt,
1177 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001178#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001179};
1180
1181static struct inet_protosw dccp_v6_protosw = {
1182 .type = SOCK_DCCP,
1183 .protocol = IPPROTO_DCCP,
1184 .prot = &dccp_v6_prot,
1185 .ops = &inet6_dccp_ops,
1186 .capability = -1,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001187 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001188};
1189
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001190static int dccp_v6_init_net(struct net *net)
1191{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001192 int err;
1193
1194 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1195 SOCK_DCCP, IPPROTO_DCCP, net);
1196 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001197}
1198
1199static void dccp_v6_exit_net(struct net *net)
1200{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001201 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001202}
1203
1204static struct pernet_operations dccp_v6_ops = {
1205 .init = dccp_v6_init_net,
1206 .exit = dccp_v6_exit_net,
1207};
1208
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001209static int __init dccp_v6_init(void)
1210{
1211 int err = proto_register(&dccp_v6_prot, 1);
1212
1213 if (err != 0)
1214 goto out;
1215
1216 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1217 if (err != 0)
1218 goto out_unregister_proto;
1219
1220 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001221
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001222 err = register_pernet_subsys(&dccp_v6_ops);
1223 if (err != 0)
1224 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001225out:
1226 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001227
1228out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001229 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1230 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001231out_unregister_proto:
1232 proto_unregister(&dccp_v6_prot);
1233 goto out;
1234}
1235
1236static void __exit dccp_v6_exit(void)
1237{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001238 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001239 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240 inet6_unregister_protosw(&dccp_v6_protosw);
1241 proto_unregister(&dccp_v6_prot);
1242}
1243
1244module_init(dccp_v6_init);
1245module_exit(dccp_v6_exit);
1246
1247/*
1248 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1249 * values directly, Also cover the case where the protocol is not specified,
1250 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1251 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001252MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1253MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001254MODULE_LICENSE("GPL");
1255MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1256MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");