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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080018#include <linux/xfrm.h>
19
20#include <net/addrconf.h>
21#include <net/inet_common.h>
22#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080024#include <net/inet6_connection_sock.h>
25#include <net/inet6_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/ipv6.h>
28#include <net/protocol.h>
29#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080030#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080031#include <net/xfrm.h>
32
33#include "dccp.h"
34#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070035#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080036
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070037/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080038
Stephen Hemminger3b401a82009-09-01 19:25:04 +000039static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080041
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080042static void dccp_v6_hash(struct sock *sk)
43{
44 if (sk->sk_state != DCCP_CLOSED) {
45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080046 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080047 return;
48 }
49 local_bh_disable();
Eric Dumazet9327f702009-12-04 03:46:54 +000050 __inet6_hash(sk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080051 local_bh_enable();
52 }
53}
54
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020055/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080056static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020057 struct in6_addr *saddr,
58 struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080059{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020060 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
61}
62
63static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
64 struct sk_buff *skb)
65{
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
68
69 dccp_csum_outgoing(skb);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080071}
72
Al Viro7d533f92006-11-14 21:51:36 -080073static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -020074 __be16 sport, __be16 dport )
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080075{
Gerrit Renkerd7f73652006-11-13 13:34:38 -020076 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
77}
78
79static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
80{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070081 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
82 ipv6_hdr(skb)->saddr.s6_addr32,
Gerrit Renkerd7f73652006-11-13 13:34:38 -020083 dccp_hdr(skb)->dccph_dport,
84 dccp_hdr(skb)->dccph_sport );
85
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080086}
87
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080088static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070089 u8 type, u8 code, int offset, __be32 info)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080090{
91 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
92 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
Wei Yongjune0bcfb02008-07-26 11:59:10 +010093 struct dccp_sock *dp;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080094 struct ipv6_pinfo *np;
95 struct sock *sk;
96 int err;
97 __u64 seq;
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -070098 struct net *net = dev_net(skb->dev);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080099
Wei Yongjun860239c2008-07-26 11:59:11 +0100100 if (skb->len < offset + sizeof(*dh) ||
101 skb->len < offset + __dccp_basic_hdr_len(dh)) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700102 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
103 ICMP6_MIB_INERRORS);
Wei Yongjun860239c2008-07-26 11:59:11 +0100104 return;
105 }
106
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -0700107 sk = inet6_lookup(net, &dccp_hashinfo,
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700108 &hdr->daddr, dh->dccph_dport,
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800109 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800110
111 if (sk == NULL) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700112 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
113 ICMP6_MIB_INERRORS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800114 return;
115 }
116
117 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700118 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800119 return;
120 }
121
122 bh_lock_sock(sk);
123 if (sock_owned_by_user(sk))
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700124 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800125
126 if (sk->sk_state == DCCP_CLOSED)
127 goto out;
128
Wei Yongjune0bcfb02008-07-26 11:59:10 +0100129 dp = dccp_sk(sk);
130 seq = dccp_hdr_seq(dh);
131 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
132 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
133 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
134 goto out;
135 }
136
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800137 np = inet6_sk(sk);
138
139 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800140 struct dst_entry *dst = NULL;
141
142 if (sock_owned_by_user(sk))
143 goto out;
144 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
145 goto out;
146
147 /* icmp should have updated the destination cache entry */
148 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800149 if (dst == NULL) {
150 struct inet_sock *inet = inet_sk(sk);
151 struct flowi fl;
152
153 /* BUGGG_FUTURE: Again, it is not clear how
154 to handle rthdr case. Ignore this complexity
155 for now.
156 */
157 memset(&fl, 0, sizeof(fl));
158 fl.proto = IPPROTO_DCCP;
159 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
160 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
161 fl.oif = sk->sk_bound_dev_if;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000162 fl.fl_ip_dport = inet->inet_dport;
163 fl.fl_ip_sport = inet->inet_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700164 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800165
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800166 err = ip6_dst_lookup(sk, &dst, &fl);
167 if (err) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800168 sk->sk_err_soft = -err;
169 goto out;
170 }
171
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800172 err = xfrm_lookup(net, &dst, &fl, sk, 0);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800173 if (err < 0) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800174 sk->sk_err_soft = -err;
175 goto out;
176 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800177 } else
178 dst_hold(dst);
179
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800180 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800181 dccp_sync_mss(sk, dst_mtu(dst));
182 } /* else let the usual retransmit timer handle it */
183 dst_release(dst);
184 goto out;
185 }
186
187 icmpv6_err_convert(type, code, &err);
188
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800189 /* Might be for an request_sock */
190 switch (sk->sk_state) {
191 struct request_sock *req, **prev;
192 case DCCP_LISTEN:
193 if (sock_owned_by_user(sk))
194 goto out;
195
196 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
197 &hdr->daddr, &hdr->saddr,
198 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800199 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800200 goto out;
201
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800202 /*
203 * ICMPs are not backlogged, hence we cannot get an established
204 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800205 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700206 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800207
208 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700209 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800210 goto out;
211 }
212
213 inet_csk_reqsk_queue_drop(sk, req, prev);
214 goto out;
215
216 case DCCP_REQUESTING:
217 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800218 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800219 if (!sock_owned_by_user(sk)) {
220 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
221 sk->sk_err = err;
222 /*
223 * Wake people up to see the error
224 * (see connect in sock.c)
225 */
226 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800227 dccp_done(sk);
228 } else
229 sk->sk_err_soft = err;
230 goto out;
231 }
232
233 if (!sock_owned_by_user(sk) && np->recverr) {
234 sk->sk_err = err;
235 sk->sk_error_report(sk);
236 } else
237 sk->sk_err_soft = err;
238
239out:
240 bh_unlock_sock(sk);
241 sock_put(sk);
242}
243
244
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000245static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
246 struct request_values *rv_unused)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800247{
248 struct inet6_request_sock *ireq6 = inet6_rsk(req);
249 struct ipv6_pinfo *np = inet6_sk(sk);
250 struct sk_buff *skb;
251 struct ipv6_txoptions *opt = NULL;
252 struct in6_addr *final_p = NULL, final;
253 struct flowi fl;
254 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800255 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800256
257 memset(&fl, 0, sizeof(fl));
258 fl.proto = IPPROTO_DCCP;
259 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
260 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
261 fl.fl6_flowlabel = 0;
262 fl.oif = ireq6->iif;
263 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700264 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700265 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800266
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800267 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800268
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800269 if (opt != NULL && opt->srcrt != NULL) {
270 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800271
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800272 ipv6_addr_copy(&final, &fl.fl6_dst);
273 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
274 final_p = &final;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800275 }
276
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800277 err = ip6_dst_lookup(sk, &dst, &fl);
278 if (err)
279 goto done;
280
281 if (final_p)
282 ipv6_addr_copy(&fl.fl6_dst, final_p);
283
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800284 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800285 if (err < 0)
286 goto done;
287
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800288 skb = dccp_make_response(sk, dst, req);
289 if (skb != NULL) {
290 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800291
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200292 dh->dccph_checksum = dccp_v6_csum_finish(skb,
293 &ireq6->loc_addr,
294 &ireq6->rmt_addr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800295 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
296 err = ip6_xmit(sk, skb, &fl, opt, 0);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200297 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800298 }
299
300done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800301 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800302 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800303 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800304 return err;
305}
306
307static void dccp_v6_reqsk_destructor(struct request_sock *req)
308{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800309 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800310 if (inet6_rsk(req)->pktopts != NULL)
311 kfree_skb(inet6_rsk(req)->pktopts);
312}
313
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800314static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800315{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700316 struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800317 struct sk_buff *skb;
318 struct flowi fl;
Eric Dumazetadf30902009-06-02 05:19:30 +0000319 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700320 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000321 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800322
Gerrit Renkere356d372007-09-26 14:35:19 -0300323 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800324 return;
325
326 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800327 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800328
Pavel Emelyanov02047742008-04-13 22:32:25 -0700329 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800330 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200331 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800332
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700333 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300334 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
335 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200336
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800337 memset(&fl, 0, sizeof(fl));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700338 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
339 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200340
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800341 fl.proto = IPPROTO_DCCP;
342 fl.oif = inet6_iif(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300343 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
344 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700345 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800346
347 /* sk = NULL, but it is safe for now. RST socket required. */
Eric Dumazetadf30902009-06-02 05:19:30 +0000348 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
349 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
350 skb_dst_set(skb, dst);
Pavel Emelyanov02047742008-04-13 22:32:25 -0700351 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800352 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
353 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
354 return;
355 }
356 }
357
358 kfree_skb(skb);
359}
360
Gerrit Renker73c9e022006-11-10 13:01:31 -0200361static struct request_sock_ops dccp6_request_sock_ops = {
362 .family = AF_INET6,
363 .obj_size = sizeof(struct dccp6_request_sock),
364 .rtx_syn_ack = dccp_v6_send_response,
365 .send_ack = dccp_reqsk_send_ack,
366 .destructor = dccp_v6_reqsk_destructor,
367 .send_reset = dccp_v6_ctl_send_reset,
368};
369
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800370static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
371{
372 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700373 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800374 struct sock *nsk;
375 struct request_sock **prev;
376 /* Find possible connection requests. */
377 struct request_sock *req = inet6_csk_search_req(sk, &prev,
378 dh->dccph_sport,
379 &iph->saddr,
380 &iph->daddr,
381 inet6_iif(skb));
382 if (req != NULL)
383 return dccp_check_req(sk, skb, req, prev);
384
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700385 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800386 &iph->saddr, dh->dccph_sport,
387 &iph->daddr, ntohs(dh->dccph_dport),
388 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800389 if (nsk != NULL) {
390 if (nsk->sk_state != DCCP_TIME_WAIT) {
391 bh_lock_sock(nsk);
392 return nsk;
393 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700394 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800395 return NULL;
396 }
397
398 return sk;
399}
400
401static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
402{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800403 struct request_sock *req;
404 struct dccp_request_sock *dreq;
405 struct inet6_request_sock *ireq6;
406 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200407 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800408 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800409
410 if (skb->protocol == htons(ETH_P_IP))
411 return dccp_v4_conn_request(sk, skb);
412
413 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700414 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800415
416 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700417 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800418 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200419 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800420 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800421 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800422 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700423 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800424 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800425 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800426
427 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
428 goto drop;
429
Gerrit Renker82709532006-10-11 16:26:54 +0100430 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800431 if (req == NULL)
432 goto drop;
433
Gerrit Renkerac757732008-11-04 23:55:49 -0800434 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
435 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800436
Gerrit Renker8b819412007-12-13 12:29:24 -0200437 dreq = dccp_rsk(req);
438 if (dccp_parse_options(sk, dreq, skb))
439 goto drop_and_free;
440
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700441 if (security_inet_conn_request(sk, skb, req))
442 goto drop_and_free;
443
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800444 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700445 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
446 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800447
448 if (ipv6_opt_accepted(sk, skb) ||
449 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
450 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
451 atomic_inc(&skb->users);
452 ireq6->pktopts = skb;
453 }
454 ireq6->iif = sk->sk_bound_dev_if;
455
456 /* So that link locals have meaning */
457 if (!sk->sk_bound_dev_if &&
458 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
459 ireq6->iif = inet6_iif(skb);
460
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800461 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800462 * Step 3: Process LISTEN state
463 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200464 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800465 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200466 * In fact we defer setting S.GSR, S.SWL, S.SWH to
467 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800468 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800469 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200470 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800471 dreq->dreq_service = service;
472
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000473 if (dccp_v6_send_response(sk, req, NULL))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800474 goto drop_and_free;
475
476 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
477 return 0;
478
479drop_and_free:
480 reqsk_free(req);
481drop:
482 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800483 return -1;
484}
485
486static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
487 struct sk_buff *skb,
488 struct request_sock *req,
489 struct dst_entry *dst)
490{
491 struct inet6_request_sock *ireq6 = inet6_rsk(req);
492 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
493 struct inet_sock *newinet;
494 struct dccp_sock *newdp;
495 struct dccp6_sock *newdp6;
496 struct sock *newsk;
497 struct ipv6_txoptions *opt;
498
499 if (skb->protocol == htons(ETH_P_IP)) {
500 /*
501 * v6 mapped
502 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800503 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800504 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800505 return NULL;
506
507 newdp6 = (struct dccp6_sock *)newsk;
508 newdp = dccp_sk(newsk);
509 newinet = inet_sk(newsk);
510 newinet->pinet6 = &newdp6->inet6;
511 newnp = inet6_sk(newsk);
512
513 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
514
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000515 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800516
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000517 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800518
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
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000645 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
646 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800647
Eric Dumazet9327f702009-12-04 03:46:54 +0000648 __inet6_hash(newsk, NULL);
Pavel Emelyanove56d8b82008-04-17 23:17:34 -0700649 __inet_inherit_port(sk, newsk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800650
651 return newsk;
652
653out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700654 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800655out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700656 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800657 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800658 sock_kfree_s(sk, opt, opt->tot_len);
659 dst_release(dst);
660 return NULL;
661}
662
663/* The socket must have it's spinlock held when we get
664 * here.
665 *
666 * We have a potential double-lock case here, so even when
667 * doing backlog processing we use the BH locking scheme.
668 * This is because we cannot sleep with the original spinlock
669 * held.
670 */
671static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
672{
673 struct ipv6_pinfo *np = inet6_sk(sk);
674 struct sk_buff *opt_skb = NULL;
675
676 /* Imagine: socket is IPv6. IPv4 packet arrives,
677 goes to IPv4 receive handler and backlogged.
678 From backlog it always goes here. Kerboom...
679 Fortunately, dccp_rcv_established and rcv_established
680 handle them correctly, but it is not case with
681 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
682 */
683
684 if (skb->protocol == htons(ETH_P_IP))
685 return dccp_v4_do_rcv(sk, skb);
686
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700687 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800688 goto discard;
689
690 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800691 * socket locking is here for SMP purposes as backlog rcv is currently
692 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800693 */
694
695 /* Do Stevens' IPV6_PKTOPTIONS.
696
697 Yes, guys, it is the only place in our code, where we
698 may make it not affecting IPv4.
699 The rest of code is protocol independent,
700 and I do not like idea to uglify IPv4.
701
702 Actually, all the idea behind IPV6_PKTOPTIONS
703 looks not very well thought. For now we latch
704 options, received in the last packet, enqueued
705 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900706 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800707 */
708 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200709 /*
710 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
711 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
712 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800713 opt_skb = skb_clone(skb, GFP_ATOMIC);
714
715 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
716 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
717 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700718 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200719 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700720 __kfree_skb(opt_skb);
721 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800722 return 0;
723 }
724
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200725 /*
726 * Step 3: Process LISTEN state
727 * If S.state == LISTEN,
728 * If P.type == Request or P contains a valid Init Cookie option,
729 * (* Must scan the packet's options to check for Init
730 * Cookies. Only Init Cookies are processed here,
731 * however; other options are processed in Step 8. This
732 * scan need only be performed if the endpoint uses Init
733 * Cookies *)
734 * (* Generate a new socket and switch to that socket *)
735 * Set S := new socket for this port pair
736 * S.state = RESPOND
737 * Choose S.ISS (initial seqno) or set from Init Cookies
738 * Initialize S.GAR := S.ISS
739 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
740 * Continue with S.state == RESPOND
741 * (* A Response packet will be generated in Step 11 *)
742 * Otherwise,
743 * Generate Reset(No Connection) unless P.type == Reset
744 * Drop packet and return
745 *
746 * NOTE: the check for the packet types is done in
747 * dccp_rcv_state_process
748 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800749 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800750 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800751
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800752 if (nsk == NULL)
753 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800754 /*
755 * Queue it on the new socket if the new socket is active,
756 * otherwise we just shortcircuit this and continue with
757 * the new socket..
758 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200759 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800760 if (dccp_child_process(sk, nsk, skb))
761 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800762 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800763 __kfree_skb(opt_skb);
764 return 0;
765 }
766 }
767
768 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
769 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700770 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200771 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700772 __kfree_skb(opt_skb);
773 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800774 return 0;
775
776reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800777 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800778discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800779 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800780 __kfree_skb(opt_skb);
781 kfree_skb(skb);
782 return 0;
783}
784
Herbert Xue5bbef22007-10-15 12:50:28 -0700785static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800786{
787 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800788 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200789 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800790
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200791 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800792
793 if (dccp_invalid_packet(skb))
794 goto discard_it;
795
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200796 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700797 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
798 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200799 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200800 goto discard_it;
801 }
802
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800803 dh = dccp_hdr(skb);
804
Gerrit Renkerfde20102007-10-24 10:12:09 -0200805 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800806 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
807
808 if (dccp_packet_without_ack(skb))
809 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
810 else
811 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
812
813 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200814 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700815 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
816 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800817 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800818 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200819 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800820 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200821 if (sk == NULL) {
822 dccp_pr_debug("failed to look up flow ID in table and "
823 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800824 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200825 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800826
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800827 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800828 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200829 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800830 * Generate Reset(No Connection) unless P.type == Reset
831 * Drop packet and return
832 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200833 if (sk->sk_state == DCCP_TIME_WAIT) {
834 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
835 inet_twsk_put(inet_twsk(sk));
836 goto no_dccp_socket;
837 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800838
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200839 /*
840 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200841 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
842 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200843 */
844 min_cov = dccp_sk(sk)->dccps_pcrlen;
845 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
846 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
847 dh->dccph_cscov, min_cov);
848 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
849 goto discard_and_relse;
850 }
851
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800852 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
853 goto discard_and_relse;
854
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200855 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800856
857no_dccp_socket:
858 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
859 goto discard_it;
860 /*
861 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200862 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800863 * Generate Reset(No Connection) unless P.type == Reset
864 * Drop packet and return
865 */
866 if (dh->dccph_type != DCCP_PKT_RESET) {
867 DCCP_SKB_CB(skb)->dccpd_reset_code =
868 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800869 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800870 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200871
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800872discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800873 kfree_skb(skb);
874 return 0;
875
876discard_and_relse:
877 sock_put(sk);
878 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800879}
880
Gerrit Renker73c9e022006-11-10 13:01:31 -0200881static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
882 int addr_len)
883{
884 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
885 struct inet_connection_sock *icsk = inet_csk(sk);
886 struct inet_sock *inet = inet_sk(sk);
887 struct ipv6_pinfo *np = inet6_sk(sk);
888 struct dccp_sock *dp = dccp_sk(sk);
889 struct in6_addr *saddr = NULL, *final_p = NULL, final;
890 struct flowi fl;
891 struct dst_entry *dst;
892 int addr_type;
893 int err;
894
895 dp->dccps_role = DCCP_ROLE_CLIENT;
896
897 if (addr_len < SIN6_LEN_RFC2133)
898 return -EINVAL;
899
900 if (usin->sin6_family != AF_INET6)
901 return -EAFNOSUPPORT;
902
903 memset(&fl, 0, sizeof(fl));
904
905 if (np->sndflow) {
906 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
907 IP6_ECN_flow_init(fl.fl6_flowlabel);
908 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
909 struct ip6_flowlabel *flowlabel;
910 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
911 if (flowlabel == NULL)
912 return -EINVAL;
913 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
914 fl6_sock_release(flowlabel);
915 }
916 }
917 /*
918 * connect() to INADDR_ANY means loopback (BSD'ism).
919 */
920 if (ipv6_addr_any(&usin->sin6_addr))
921 usin->sin6_addr.s6_addr[15] = 1;
922
923 addr_type = ipv6_addr_type(&usin->sin6_addr);
924
925 if (addr_type & IPV6_ADDR_MULTICAST)
926 return -ENETUNREACH;
927
928 if (addr_type & IPV6_ADDR_LINKLOCAL) {
929 if (addr_len >= sizeof(struct sockaddr_in6) &&
930 usin->sin6_scope_id) {
931 /* If interface is set while binding, indices
932 * must coincide.
933 */
934 if (sk->sk_bound_dev_if &&
935 sk->sk_bound_dev_if != usin->sin6_scope_id)
936 return -EINVAL;
937
938 sk->sk_bound_dev_if = usin->sin6_scope_id;
939 }
940
941 /* Connect to link-local address requires an interface */
942 if (!sk->sk_bound_dev_if)
943 return -EINVAL;
944 }
945
946 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
947 np->flow_label = fl.fl6_flowlabel;
948
949 /*
950 * DCCP over IPv4
951 */
952 if (addr_type == IPV6_ADDR_MAPPED) {
953 u32 exthdrlen = icsk->icsk_ext_hdr_len;
954 struct sockaddr_in sin;
955
956 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
957
958 if (__ipv6_only_sock(sk))
959 return -ENETUNREACH;
960
961 sin.sin_family = AF_INET;
962 sin.sin_port = usin->sin6_port;
963 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
964
965 icsk->icsk_af_ops = &dccp_ipv6_mapped;
966 sk->sk_backlog_rcv = dccp_v4_do_rcv;
967
968 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
969 if (err) {
970 icsk->icsk_ext_hdr_len = exthdrlen;
971 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
972 sk->sk_backlog_rcv = dccp_v6_do_rcv;
973 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200974 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000975 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
976 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200977
978 return err;
979 }
980
981 if (!ipv6_addr_any(&np->rcv_saddr))
982 saddr = &np->rcv_saddr;
983
984 fl.proto = IPPROTO_DCCP;
985 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
986 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
987 fl.oif = sk->sk_bound_dev_if;
988 fl.fl_ip_dport = usin->sin6_port;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000989 fl.fl_ip_sport = inet->inet_sport;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200990 security_sk_classify_flow(sk, &fl);
991
992 if (np->opt != NULL && np->opt->srcrt != NULL) {
993 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
994
995 ipv6_addr_copy(&final, &fl.fl6_dst);
996 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
997 final_p = &final;
998 }
999
1000 err = ip6_dst_lookup(sk, &dst, &fl);
1001 if (err)
1002 goto failure;
1003
1004 if (final_p)
1005 ipv6_addr_copy(&fl.fl6_dst, final_p);
1006
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001007 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
David S. Miller14e50e52007-05-24 18:17:54 -07001008 if (err < 0) {
1009 if (err == -EREMOTE)
1010 err = ip6_dst_blackhole(sk, &dst, &fl);
1011 if (err < 0)
1012 goto failure;
1013 }
Gerrit Renker73c9e022006-11-10 13:01:31 -02001014
1015 if (saddr == NULL) {
1016 saddr = &fl.fl6_src;
1017 ipv6_addr_copy(&np->rcv_saddr, saddr);
1018 }
1019
1020 /* set the source address */
1021 ipv6_addr_copy(&np->saddr, saddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001022 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001023
1024 __ip6_dst_store(sk, dst, NULL, NULL);
1025
1026 icsk->icsk_ext_hdr_len = 0;
1027 if (np->opt != NULL)
1028 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1029 np->opt->opt_nflen);
1030
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001031 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001032
1033 dccp_set_state(sk, DCCP_REQUESTING);
1034 err = inet6_hash_connect(&dccp_death_row, sk);
1035 if (err)
1036 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -02001037
1038 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1039 np->daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001040 inet->inet_sport,
1041 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -02001042 err = dccp_connect(sk);
1043 if (err)
1044 goto late_failure;
1045
1046 return 0;
1047
1048late_failure:
1049 dccp_set_state(sk, DCCP_CLOSED);
1050 __sk_dst_reset(sk);
1051failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001052 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001053 sk->sk_route_caps = 0;
1054 return err;
1055}
1056
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001057static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001058 .queue_xmit = inet6_csk_xmit,
1059 .send_check = dccp_v6_send_check,
1060 .rebuild_header = inet6_sk_rebuild_header,
1061 .conn_request = dccp_v6_conn_request,
1062 .syn_recv_sock = dccp_v6_request_recv_sock,
1063 .net_header_len = sizeof(struct ipv6hdr),
1064 .setsockopt = ipv6_setsockopt,
1065 .getsockopt = ipv6_getsockopt,
1066 .addr2sockaddr = inet6_csk_addr2sockaddr,
1067 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001068 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001069#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001070 .compat_setsockopt = compat_ipv6_setsockopt,
1071 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001072#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001073};
1074
1075/*
1076 * DCCP over IPv4 via INET6 API
1077 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001078static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001079 .queue_xmit = ip_queue_xmit,
1080 .send_check = dccp_v4_send_check,
1081 .rebuild_header = inet_sk_rebuild_header,
1082 .conn_request = dccp_v6_conn_request,
1083 .syn_recv_sock = dccp_v6_request_recv_sock,
1084 .net_header_len = sizeof(struct iphdr),
1085 .setsockopt = ipv6_setsockopt,
1086 .getsockopt = ipv6_getsockopt,
1087 .addr2sockaddr = inet6_csk_addr2sockaddr,
1088 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001089#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001090 .compat_setsockopt = compat_ipv6_setsockopt,
1091 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001092#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001093};
1094
1095/* NOTE: A lot of things set to zero explicitly by call to
1096 * sk_alloc() so need not be done here.
1097 */
1098static int dccp_v6_init_sock(struct sock *sk)
1099{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001100 static __u8 dccp_v6_ctl_sock_initialized;
1101 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001102
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001103 if (err == 0) {
1104 if (unlikely(!dccp_v6_ctl_sock_initialized))
1105 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001106 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001107 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001108
1109 return err;
1110}
1111
Brian Haley7d06b2e2008-06-14 17:04:49 -07001112static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001113{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001114 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001115 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001116}
1117
Gerrit Renker73c9e022006-11-10 13:01:31 -02001118static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1119 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1120};
1121
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001122static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001123 .name = "DCCPv6",
1124 .owner = THIS_MODULE,
1125 .close = dccp_close,
1126 .connect = dccp_v6_connect,
1127 .disconnect = dccp_disconnect,
1128 .ioctl = dccp_ioctl,
1129 .init = dccp_v6_init_sock,
1130 .setsockopt = dccp_setsockopt,
1131 .getsockopt = dccp_getsockopt,
1132 .sendmsg = dccp_sendmsg,
1133 .recvmsg = dccp_recvmsg,
1134 .backlog_rcv = dccp_v6_do_rcv,
1135 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001136 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001137 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001138 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001139 .shutdown = dccp_shutdown,
1140 .destroy = dccp_v6_destroy_sock,
1141 .orphan_count = &dccp_orphan_count,
1142 .max_header = MAX_DCCP_HEADER,
1143 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001144 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001145 .rsk_prot = &dccp6_request_sock_ops,
1146 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001147 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001148#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001149 .compat_setsockopt = compat_dccp_setsockopt,
1150 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001151#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001152};
1153
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001154static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001155 .handler = dccp_v6_rcv,
1156 .err_handler = dccp_v6_err,
1157 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001158};
1159
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001160static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001161 .family = PF_INET6,
1162 .owner = THIS_MODULE,
1163 .release = inet6_release,
1164 .bind = inet6_bind,
1165 .connect = inet_stream_connect,
1166 .socketpair = sock_no_socketpair,
1167 .accept = inet_accept,
1168 .getname = inet6_getname,
1169 .poll = dccp_poll,
1170 .ioctl = inet6_ioctl,
1171 .listen = inet_dccp_listen,
1172 .shutdown = inet_shutdown,
1173 .setsockopt = sock_common_setsockopt,
1174 .getsockopt = sock_common_getsockopt,
1175 .sendmsg = inet_sendmsg,
1176 .recvmsg = sock_common_recvmsg,
1177 .mmap = sock_no_mmap,
1178 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001179#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001180 .compat_setsockopt = compat_sock_common_setsockopt,
1181 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001182#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001183};
1184
1185static struct inet_protosw dccp_v6_protosw = {
1186 .type = SOCK_DCCP,
1187 .protocol = IPPROTO_DCCP,
1188 .prot = &dccp_v6_prot,
1189 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001190 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001191};
1192
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001193static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001194{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001195 if (dccp_hashinfo.bhash == NULL)
1196 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001197
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001198 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1199 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001200}
1201
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001202static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001203{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001204 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001205}
1206
1207static struct pernet_operations dccp_v6_ops = {
1208 .init = dccp_v6_init_net,
1209 .exit = dccp_v6_exit_net,
1210};
1211
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001212static int __init dccp_v6_init(void)
1213{
1214 int err = proto_register(&dccp_v6_prot, 1);
1215
1216 if (err != 0)
1217 goto out;
1218
1219 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1220 if (err != 0)
1221 goto out_unregister_proto;
1222
1223 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001224
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001225 err = register_pernet_subsys(&dccp_v6_ops);
1226 if (err != 0)
1227 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001228out:
1229 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001230
1231out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001232 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1233 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001234out_unregister_proto:
1235 proto_unregister(&dccp_v6_prot);
1236 goto out;
1237}
1238
1239static void __exit dccp_v6_exit(void)
1240{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001241 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001242 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1243 inet6_unregister_protosw(&dccp_v6_protosw);
1244 proto_unregister(&dccp_v6_prot);
1245}
1246
1247module_init(dccp_v6_init);
1248module_exit(dccp_v6_exit);
1249
1250/*
1251 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1252 * values directly, Also cover the case where the protocol is not specified,
1253 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1254 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001255MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1256MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001257MODULE_LICENSE("GPL");
1258MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1259MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");