blob: ab1ab95946dfaeed03dfe846eb37ca48689f5398 [file] [log] [blame]
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001/*
2 * DCCP over IPv6
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08003 * Linux INET6 implementation
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08004 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080015#include <linux/module.h>
16#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080018#include <linux/xfrm.h>
19
20#include <net/addrconf.h>
21#include <net/inet_common.h>
22#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080024#include <net/inet6_connection_sock.h>
25#include <net/inet6_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/ipv6.h>
28#include <net/protocol.h>
29#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080030#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080031#include <net/xfrm.h>
32
33#include "dccp.h"
34#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070035#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080036
Pavel Emelyanov13f51d82008-04-14 02:38:45 -070037/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080038
Stephen Hemminger3b401a82009-09-01 19:25:04 +000039static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080041
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080042static void dccp_v6_hash(struct sock *sk)
43{
44 if (sk->sk_state != DCCP_CLOSED) {
45 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080046 inet_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080047 return;
48 }
49 local_bh_disable();
Eric Dumazet9327f702009-12-04 03:46:54 +000050 __inet6_hash(sk, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080051 local_bh_enable();
52 }
53}
54
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020055/* add pseudo-header to DCCP checksum stored in skb->csum */
Al Viro868c86b2006-11-14 21:35:48 -080056static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020057 struct in6_addr *saddr,
58 struct in6_addr *daddr)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080059{
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020060 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
61}
62
Herbert Xubb296242010-04-11 02:15:55 +000063static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -020064{
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct dccp_hdr *dh = dccp_hdr(skb);
67
68 dccp_csum_outgoing(skb);
69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080070}
71
Al Viro7d533f92006-11-14 21:51:36 -080072static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -020073 __be16 sport, __be16 dport )
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080074{
Gerrit Renkerd7f73652006-11-13 13:34:38 -020075 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
76}
77
78static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
79{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -070080 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
81 ipv6_hdr(skb)->saddr.s6_addr32,
Gerrit Renkerd7f73652006-11-13 13:34:38 -020082 dccp_hdr(skb)->dccph_dport,
83 dccp_hdr(skb)->dccph_sport );
84
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080085}
86
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080087static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -070088 u8 type, u8 code, int offset, __be32 info)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080089{
90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
Wei Yongjune0bcfb02008-07-26 11:59:10 +010092 struct dccp_sock *dp;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080093 struct ipv6_pinfo *np;
94 struct sock *sk;
95 int err;
96 __u64 seq;
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -070097 struct net *net = dev_net(skb->dev);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080098
Wei Yongjun860239c2008-07-26 11:59:11 +010099 if (skb->len < offset + sizeof(*dh) ||
100 skb->len < offset + __dccp_basic_hdr_len(dh)) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700101 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
102 ICMP6_MIB_INERRORS);
Wei Yongjun860239c2008-07-26 11:59:11 +0100103 return;
104 }
105
Pavel Emelyanovca12a1a2008-07-16 20:28:42 -0700106 sk = inet6_lookup(net, &dccp_hashinfo,
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700107 &hdr->daddr, dh->dccph_dport,
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800109
110 if (sk == NULL) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 ICMP6_MIB_INERRORS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800113 return;
114 }
115
116 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700117 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800118 return;
119 }
120
121 bh_lock_sock(sk);
122 if (sock_owned_by_user(sk))
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800124
125 if (sk->sk_state == DCCP_CLOSED)
126 goto out;
127
Wei Yongjune0bcfb02008-07-26 11:59:10 +0100128 dp = dccp_sk(sk);
129 seq = dccp_hdr_seq(dh);
130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 goto out;
134 }
135
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800136 np = inet6_sk(sk);
137
138 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800139 struct dst_entry *dst = NULL;
140
141 if (sock_owned_by_user(sk))
142 goto out;
143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
144 goto out;
145
146 /* icmp should have updated the destination cache entry */
147 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800148 if (dst == NULL) {
149 struct inet_sock *inet = inet_sk(sk);
150 struct flowi fl;
151
152 /* BUGGG_FUTURE: Again, it is not clear how
153 to handle rthdr case. Ignore this complexity
154 for now.
155 */
156 memset(&fl, 0, sizeof(fl));
157 fl.proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
159 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
160 fl.oif = sk->sk_bound_dev_if;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000161 fl.fl_ip_dport = inet->inet_dport;
162 fl.fl_ip_sport = inet->inet_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700163 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800164
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800167 sk->sk_err_soft = -err;
168 goto out;
169 }
170
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800171 err = xfrm_lookup(net, &dst, &fl, sk, 0);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800172 if (err < 0) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800173 sk->sk_err_soft = -err;
174 goto out;
175 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800176 } else
177 dst_hold(dst);
178
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800180 dccp_sync_mss(sk, dst_mtu(dst));
181 } /* else let the usual retransmit timer handle it */
182 dst_release(dst);
183 goto out;
184 }
185
186 icmpv6_err_convert(type, code, &err);
187
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800188 /* Might be for an request_sock */
189 switch (sk->sk_state) {
190 struct request_sock *req, **prev;
191 case DCCP_LISTEN:
192 if (sock_owned_by_user(sk))
193 goto out;
194
195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
196 &hdr->daddr, &hdr->saddr,
197 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800198 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800199 goto out;
200
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800201 /*
202 * ICMPs are not backlogged, hence we cannot get an established
203 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800204 */
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700205 WARN_ON(req->sk != NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800206
207 if (seq != dccp_rsk(req)->dreq_iss) {
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800209 goto out;
210 }
211
212 inet_csk_reqsk_queue_drop(sk, req, prev);
213 goto out;
214
215 case DCCP_REQUESTING:
216 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800217 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800218 if (!sock_owned_by_user(sk)) {
219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220 sk->sk_err = err;
221 /*
222 * Wake people up to see the error
223 * (see connect in sock.c)
224 */
225 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800226 dccp_done(sk);
227 } else
228 sk->sk_err_soft = err;
229 goto out;
230 }
231
232 if (!sock_owned_by_user(sk) && np->recverr) {
233 sk->sk_err = err;
234 sk->sk_error_report(sk);
235 } else
236 sk->sk_err_soft = err;
237
238out:
239 bh_unlock_sock(sk);
240 sock_put(sk);
241}
242
243
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000244static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
245 struct request_values *rv_unused)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800246{
247 struct inet6_request_sock *ireq6 = inet6_rsk(req);
248 struct ipv6_pinfo *np = inet6_sk(sk);
249 struct sk_buff *skb;
250 struct ipv6_txoptions *opt = NULL;
251 struct in6_addr *final_p = NULL, final;
252 struct flowi fl;
253 int err = -1;
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800254 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800255
256 memset(&fl, 0, sizeof(fl));
257 fl.proto = IPPROTO_DCCP;
258 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
259 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
260 fl.fl6_flowlabel = 0;
261 fl.oif = ireq6->iif;
262 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700263 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700264 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800265
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800266 opt = np->opt;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800267
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800268 if (opt != NULL && opt->srcrt != NULL) {
269 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800270
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800271 ipv6_addr_copy(&final, &fl.fl6_dst);
272 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
273 final_p = &final;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800274 }
275
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800276 err = ip6_dst_lookup(sk, &dst, &fl);
277 if (err)
278 goto done;
279
280 if (final_p)
281 ipv6_addr_copy(&fl.fl6_dst, final_p);
282
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800283 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
Denis V. Lunevfd80eb92008-02-29 11:43:03 -0800284 if (err < 0)
285 goto done;
286
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800287 skb = dccp_make_response(sk, dst, req);
288 if (skb != NULL) {
289 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800290
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200291 dh->dccph_checksum = dccp_v6_csum_finish(skb,
292 &ireq6->loc_addr,
293 &ireq6->rmt_addr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800294 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
295 err = ip6_xmit(sk, skb, &fl, opt, 0);
Gerrit Renkerb9df3cb2006-11-14 11:21:36 -0200296 err = net_xmit_eval(err);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800297 }
298
299done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800300 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800301 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800302 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800303 return err;
304}
305
306static void dccp_v6_reqsk_destructor(struct request_sock *req)
307{
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800308 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800309 if (inet6_rsk(req)->pktopts != NULL)
310 kfree_skb(inet6_rsk(req)->pktopts);
311}
312
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800313static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800314{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700315 struct ipv6hdr *rxip6h;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800316 struct sk_buff *skb;
317 struct flowi fl;
Eric Dumazetadf30902009-06-02 05:19:30 +0000318 struct net *net = dev_net(skb_dst(rxskb)->dev);
Pavel Emelyanov334527d2008-04-13 22:32:45 -0700319 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
Eric Dumazetadf30902009-06-02 05:19:30 +0000320 struct dst_entry *dst;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800321
Gerrit Renkere356d372007-09-26 14:35:19 -0300322 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800323 return;
324
325 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800326 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800327
Pavel Emelyanov02047742008-04-13 22:32:25 -0700328 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800329 if (skb == NULL)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200330 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800331
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700332 rxip6h = ipv6_hdr(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300333 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
334 &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200335
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800336 memset(&fl, 0, sizeof(fl));
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700337 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
338 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200339
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800340 fl.proto = IPPROTO_DCCP;
341 fl.oif = inet6_iif(rxskb);
Gerrit Renkere356d372007-09-26 14:35:19 -0300342 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
343 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700344 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800345
346 /* sk = NULL, but it is safe for now. RST socket required. */
Eric Dumazetadf30902009-06-02 05:19:30 +0000347 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
348 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
349 skb_dst_set(skb, dst);
Pavel Emelyanov02047742008-04-13 22:32:25 -0700350 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800351 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
352 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
353 return;
354 }
355 }
356
357 kfree_skb(skb);
358}
359
Gerrit Renker73c9e022006-11-10 13:01:31 -0200360static struct request_sock_ops dccp6_request_sock_ops = {
361 .family = AF_INET6,
362 .obj_size = sizeof(struct dccp6_request_sock),
363 .rtx_syn_ack = dccp_v6_send_response,
364 .send_ack = dccp_reqsk_send_ack,
365 .destructor = dccp_v6_reqsk_destructor,
366 .send_reset = dccp_v6_ctl_send_reset,
367};
368
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800369static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
370{
371 const struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700372 const struct ipv6hdr *iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800373 struct sock *nsk;
374 struct request_sock **prev;
375 /* Find possible connection requests. */
376 struct request_sock *req = inet6_csk_search_req(sk, &prev,
377 dh->dccph_sport,
378 &iph->saddr,
379 &iph->daddr,
380 inet6_iif(skb));
381 if (req != NULL)
382 return dccp_check_req(sk, skb, req, prev);
383
Pavel Emelyanov671a1c72008-04-13 22:33:06 -0700384 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800385 &iph->saddr, dh->dccph_sport,
386 &iph->daddr, ntohs(dh->dccph_dport),
387 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800388 if (nsk != NULL) {
389 if (nsk->sk_state != DCCP_TIME_WAIT) {
390 bh_lock_sock(nsk);
391 return nsk;
392 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700393 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800394 return NULL;
395 }
396
397 return sk;
398}
399
400static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
401{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800402 struct request_sock *req;
403 struct dccp_request_sock *dreq;
404 struct inet6_request_sock *ireq6;
405 struct ipv6_pinfo *np = inet6_sk(sk);
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200406 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800407 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800408
409 if (skb->protocol == htons(ETH_P_IP))
410 return dccp_v4_conn_request(sk, skb);
411
412 if (!ipv6_unicast_destination(skb))
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700413 return 0; /* discard, don't send a reset here */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800414
415 if (dccp_bad_service_code(sk, service)) {
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700416 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800417 goto drop;
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200418 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800419 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800420 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800421 */
Gerrit Renker4a5409a2007-10-04 14:52:28 -0700422 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800423 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800424 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800425
426 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
427 goto drop;
428
Gerrit Renker82709532006-10-11 16:26:54 +0100429 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800430 if (req == NULL)
431 goto drop;
432
Gerrit Renkerac757732008-11-04 23:55:49 -0800433 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
434 goto drop_and_free;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800435
Gerrit Renker8b819412007-12-13 12:29:24 -0200436 dreq = dccp_rsk(req);
437 if (dccp_parse_options(sk, dreq, skb))
438 goto drop_and_free;
439
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700440 if (security_inet_conn_request(sk, skb, req))
441 goto drop_and_free;
442
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800443 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700444 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
445 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800446
447 if (ipv6_opt_accepted(sk, skb) ||
448 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
449 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
450 atomic_inc(&skb->users);
451 ireq6->pktopts = skb;
452 }
453 ireq6->iif = sk->sk_bound_dev_if;
454
455 /* So that link locals have meaning */
456 if (!sk->sk_bound_dev_if &&
457 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
458 ireq6->iif = inet6_iif(skb);
459
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800460 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800461 * Step 3: Process LISTEN state
462 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200463 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800464 *
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200465 * In fact we defer setting S.GSR, S.SWL, S.SWH to
466 * dccp_create_openreq_child.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800467 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800468 dreq->dreq_isr = dcb->dccpd_seq;
Gerrit Renker865e9022006-11-13 13:31:50 -0200469 dreq->dreq_iss = dccp_v6_init_sequence(skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800470 dreq->dreq_service = service;
471
William Allen Simpsone6b4d112009-12-02 18:07:39 +0000472 if (dccp_v6_send_response(sk, req, NULL))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800473 goto drop_and_free;
474
475 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
476 return 0;
477
478drop_and_free:
479 reqsk_free(req);
480drop:
481 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800482 return -1;
483}
484
485static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
486 struct sk_buff *skb,
487 struct request_sock *req,
488 struct dst_entry *dst)
489{
490 struct inet6_request_sock *ireq6 = inet6_rsk(req);
491 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
492 struct inet_sock *newinet;
493 struct dccp_sock *newdp;
494 struct dccp6_sock *newdp6;
495 struct sock *newsk;
496 struct ipv6_txoptions *opt;
497
498 if (skb->protocol == htons(ETH_P_IP)) {
499 /*
500 * v6 mapped
501 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800502 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800503 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800504 return NULL;
505
506 newdp6 = (struct dccp6_sock *)newsk;
507 newdp = dccp_sk(newsk);
508 newinet = inet_sk(newsk);
509 newinet->pinet6 = &newdp6->inet6;
510 newnp = inet6_sk(newsk);
511
512 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
513
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000514 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800515
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000516 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800517
518 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
519
520 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
521 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
522 newnp->pktoptions = NULL;
523 newnp->opt = NULL;
524 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700525 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800526
527 /*
528 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
529 * here, dccp_create_openreq_child now does this for us, see the comment in
530 * that function for the gory details. -acme
531 */
532
533 /* It is tricky place. Until this moment IPv4 tcp
534 worked with IPv6 icsk.icsk_af_ops.
535 Sync it now.
536 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800537 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800538
539 return newsk;
540 }
541
542 opt = np->opt;
543
544 if (sk_acceptq_is_full(sk))
545 goto out_overflow;
546
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800547 if (dst == NULL) {
548 struct in6_addr *final_p = NULL, final;
549 struct flowi fl;
550
551 memset(&fl, 0, sizeof(fl));
552 fl.proto = IPPROTO_DCCP;
553 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800554 if (opt != NULL && opt->srcrt != NULL) {
555 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
556
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800557 ipv6_addr_copy(&final, &fl.fl6_dst);
558 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
559 final_p = &final;
560 }
561 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
562 fl.oif = sk->sk_bound_dev_if;
563 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
Gerrit Renker944f7502008-10-19 23:36:47 -0700564 fl.fl_ip_sport = inet_rsk(req)->loc_port;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700565 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800566
567 if (ip6_dst_lookup(sk, &dst, &fl))
568 goto out;
569
570 if (final_p)
571 ipv6_addr_copy(&fl.fl6_dst, final_p);
572
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800573 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800574 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800575 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800576
577 newsk = dccp_create_openreq_child(sk, req, skb);
578 if (newsk == NULL)
579 goto out;
580
581 /*
582 * No need to charge this sock to the relevant IPv6 refcnt debug socks
583 * count here, dccp_create_openreq_child now does this for us, see the
584 * comment in that function for the gory details. -acme
585 */
586
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700587 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800588 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
589 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800590 newdp6 = (struct dccp6_sock *)newsk;
591 newinet = inet_sk(newsk);
592 newinet->pinet6 = &newdp6->inet6;
593 newdp = dccp_sk(newsk);
594 newnp = inet6_sk(newsk);
595
596 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
597
598 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
599 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
600 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
601 newsk->sk_bound_dev_if = ireq6->iif;
602
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800603 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800604
605 First: no IPv4 options.
606 */
607 newinet->opt = NULL;
608
609 /* Clone RX bits */
610 newnp->rxopt.all = np->rxopt.all;
611
612 /* Clone pktoptions received with SYN */
613 newnp->pktoptions = NULL;
614 if (ireq6->pktopts != NULL) {
615 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
616 kfree_skb(ireq6->pktopts);
617 ireq6->pktopts = NULL;
618 if (newnp->pktoptions)
619 skb_set_owner_r(newnp->pktoptions, newsk);
620 }
621 newnp->opt = NULL;
622 newnp->mcast_oif = inet6_iif(skb);
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700623 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800624
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800625 /*
626 * Clone native IPv6 options from listening socket (if any)
627 *
628 * Yes, keeping reference count would be much more clever, but we make
629 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800630 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800631 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800632 newnp->opt = ipv6_dup_options(newsk, opt);
633 if (opt != np->opt)
634 sock_kfree_s(sk, opt, opt->tot_len);
635 }
636
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800637 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800638 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800639 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
640 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800641
642 dccp_sync_mss(newsk, dst_mtu(dst));
643
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000644 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
645 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800646
Eric Dumazet9327f702009-12-04 03:46:54 +0000647 __inet6_hash(newsk, NULL);
Pavel Emelyanove56d8b82008-04-17 23:17:34 -0700648 __inet_inherit_port(sk, newsk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800649
650 return newsk;
651
652out_overflow:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800654out:
Pavel Emelyanovde0744a2008-07-16 20:31:16 -0700655 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800656 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800657 sock_kfree_s(sk, opt, opt->tot_len);
658 dst_release(dst);
659 return NULL;
660}
661
662/* The socket must have it's spinlock held when we get
663 * here.
664 *
665 * We have a potential double-lock case here, so even when
666 * doing backlog processing we use the BH locking scheme.
667 * This is because we cannot sleep with the original spinlock
668 * held.
669 */
670static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
671{
672 struct ipv6_pinfo *np = inet6_sk(sk);
673 struct sk_buff *opt_skb = NULL;
674
675 /* Imagine: socket is IPv6. IPv4 packet arrives,
676 goes to IPv4 receive handler and backlogged.
677 From backlog it always goes here. Kerboom...
678 Fortunately, dccp_rcv_established and rcv_established
679 handle them correctly, but it is not case with
680 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
681 */
682
683 if (skb->protocol == htons(ETH_P_IP))
684 return dccp_v4_do_rcv(sk, skb);
685
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700686 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800687 goto discard;
688
689 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800690 * socket locking is here for SMP purposes as backlog rcv is currently
691 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800692 */
693
694 /* Do Stevens' IPV6_PKTOPTIONS.
695
696 Yes, guys, it is the only place in our code, where we
697 may make it not affecting IPv4.
698 The rest of code is protocol independent,
699 and I do not like idea to uglify IPv4.
700
701 Actually, all the idea behind IPV6_PKTOPTIONS
702 looks not very well thought. For now we latch
703 options, received in the last packet, enqueued
704 by tcp. Feel free to propose better solution.
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900705 --ANK (980728)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800706 */
707 if (np->rxopt.all)
Gerrit Renker89e7e572006-11-10 11:13:33 -0200708 /*
709 * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
710 * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
711 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800712 opt_skb = skb_clone(skb, GFP_ATOMIC);
713
714 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
715 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
716 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700717 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200718 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700719 __kfree_skb(opt_skb);
720 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800721 return 0;
722 }
723
Gerrit Renkerd83ca5a2006-11-10 16:29:14 -0200724 /*
725 * Step 3: Process LISTEN state
726 * If S.state == LISTEN,
727 * If P.type == Request or P contains a valid Init Cookie option,
728 * (* Must scan the packet's options to check for Init
729 * Cookies. Only Init Cookies are processed here,
730 * however; other options are processed in Step 8. This
731 * scan need only be performed if the endpoint uses Init
732 * Cookies *)
733 * (* Generate a new socket and switch to that socket *)
734 * Set S := new socket for this port pair
735 * S.state = RESPOND
736 * Choose S.ISS (initial seqno) or set from Init Cookies
737 * Initialize S.GAR := S.ISS
738 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
739 * Continue with S.state == RESPOND
740 * (* A Response packet will be generated in Step 11 *)
741 * Otherwise,
742 * Generate Reset(No Connection) unless P.type == Reset
743 * Drop packet and return
744 *
745 * NOTE: the check for the packet types is done in
746 * dccp_rcv_state_process
747 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800748 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800749 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800750
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800751 if (nsk == NULL)
752 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800753 /*
754 * Queue it on the new socket if the new socket is active,
755 * otherwise we just shortcircuit this and continue with
756 * the new socket..
757 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200758 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800759 if (dccp_child_process(sk, nsk, skb))
760 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800761 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800762 __kfree_skb(opt_skb);
763 return 0;
764 }
765 }
766
767 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
768 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700769 if (opt_skb) {
Gerrit Renker89e7e572006-11-10 11:13:33 -0200770 /* XXX This is where we would goto ipv6_pktoptions. */
David S. Millerfd169f12006-10-20 19:44:17 -0700771 __kfree_skb(opt_skb);
772 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800773 return 0;
774
775reset:
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800776 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800777discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800778 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800779 __kfree_skb(opt_skb);
780 kfree_skb(skb);
781 return 0;
782}
783
Herbert Xue5bbef22007-10-15 12:50:28 -0700784static int dccp_v6_rcv(struct sk_buff *skb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800785{
786 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800787 struct sock *sk;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200788 int min_cov;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800789
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200790 /* Step 1: Check header basics */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800791
792 if (dccp_invalid_packet(skb))
793 goto discard_it;
794
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200795 /* Step 1: If header checksum is incorrect, drop packet and return. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700796 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
797 &ipv6_hdr(skb)->daddr)) {
Gerrit Renker59348b12006-11-20 18:39:23 -0200798 DCCP_WARN("dropped packet with invalid checksum\n");
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200799 goto discard_it;
800 }
801
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800802 dh = dccp_hdr(skb);
803
Gerrit Renkerfde20102007-10-24 10:12:09 -0200804 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800805 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
806
807 if (dccp_packet_without_ack(skb))
808 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
809 else
810 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
811
812 /* Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200813 * Look up flow ID in table and get corresponding socket */
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700814 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
815 dh->dccph_sport, dh->dccph_dport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800816 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800817 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200818 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800819 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200820 if (sk == NULL) {
821 dccp_pr_debug("failed to look up flow ID in table and "
822 "get corresponding socket\n");
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800823 goto no_dccp_socket;
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200824 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800825
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800826 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800827 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200828 * ... or S.state == TIMEWAIT,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800829 * Generate Reset(No Connection) unless P.type == Reset
830 * Drop packet and return
831 */
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200832 if (sk->sk_state == DCCP_TIME_WAIT) {
833 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
834 inet_twsk_put(inet_twsk(sk));
835 goto no_dccp_socket;
836 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800837
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200838 /*
839 * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200840 * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
841 * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200842 */
843 min_cov = dccp_sk(sk)->dccps_pcrlen;
844 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
845 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
846 dh->dccph_cscov, min_cov);
847 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
848 goto discard_and_relse;
849 }
850
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800851 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
852 goto discard_and_relse;
853
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200854 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800855
856no_dccp_socket:
857 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
858 goto discard_it;
859 /*
860 * Step 2:
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200861 * If no socket ...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800862 * Generate Reset(No Connection) unless P.type == Reset
863 * Drop packet and return
864 */
865 if (dh->dccph_type != DCCP_PKT_RESET) {
866 DCCP_SKB_CB(skb)->dccpd_reset_code =
867 DCCP_RESET_CODE_NO_CONNECTION;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800868 dccp_v6_ctl_send_reset(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800869 }
Gerrit Renkerd23c7102006-11-10 11:46:34 -0200870
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800871discard_it:
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800872 kfree_skb(skb);
873 return 0;
874
875discard_and_relse:
876 sock_put(sk);
877 goto discard_it;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800878}
879
Gerrit Renker73c9e022006-11-10 13:01:31 -0200880static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
881 int addr_len)
882{
883 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
884 struct inet_connection_sock *icsk = inet_csk(sk);
885 struct inet_sock *inet = inet_sk(sk);
886 struct ipv6_pinfo *np = inet6_sk(sk);
887 struct dccp_sock *dp = dccp_sk(sk);
888 struct in6_addr *saddr = NULL, *final_p = NULL, final;
889 struct flowi fl;
890 struct dst_entry *dst;
891 int addr_type;
892 int err;
893
894 dp->dccps_role = DCCP_ROLE_CLIENT;
895
896 if (addr_len < SIN6_LEN_RFC2133)
897 return -EINVAL;
898
899 if (usin->sin6_family != AF_INET6)
900 return -EAFNOSUPPORT;
901
902 memset(&fl, 0, sizeof(fl));
903
904 if (np->sndflow) {
905 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
906 IP6_ECN_flow_init(fl.fl6_flowlabel);
907 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
908 struct ip6_flowlabel *flowlabel;
909 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
910 if (flowlabel == NULL)
911 return -EINVAL;
912 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
913 fl6_sock_release(flowlabel);
914 }
915 }
916 /*
917 * connect() to INADDR_ANY means loopback (BSD'ism).
918 */
919 if (ipv6_addr_any(&usin->sin6_addr))
920 usin->sin6_addr.s6_addr[15] = 1;
921
922 addr_type = ipv6_addr_type(&usin->sin6_addr);
923
924 if (addr_type & IPV6_ADDR_MULTICAST)
925 return -ENETUNREACH;
926
927 if (addr_type & IPV6_ADDR_LINKLOCAL) {
928 if (addr_len >= sizeof(struct sockaddr_in6) &&
929 usin->sin6_scope_id) {
930 /* If interface is set while binding, indices
931 * must coincide.
932 */
933 if (sk->sk_bound_dev_if &&
934 sk->sk_bound_dev_if != usin->sin6_scope_id)
935 return -EINVAL;
936
937 sk->sk_bound_dev_if = usin->sin6_scope_id;
938 }
939
940 /* Connect to link-local address requires an interface */
941 if (!sk->sk_bound_dev_if)
942 return -EINVAL;
943 }
944
945 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
946 np->flow_label = fl.fl6_flowlabel;
947
948 /*
949 * DCCP over IPv4
950 */
951 if (addr_type == IPV6_ADDR_MAPPED) {
952 u32 exthdrlen = icsk->icsk_ext_hdr_len;
953 struct sockaddr_in sin;
954
955 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
956
957 if (__ipv6_only_sock(sk))
958 return -ENETUNREACH;
959
960 sin.sin_family = AF_INET;
961 sin.sin_port = usin->sin6_port;
962 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
963
964 icsk->icsk_af_ops = &dccp_ipv6_mapped;
965 sk->sk_backlog_rcv = dccp_v4_do_rcv;
966
967 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
968 if (err) {
969 icsk->icsk_ext_hdr_len = exthdrlen;
970 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
971 sk->sk_backlog_rcv = dccp_v6_do_rcv;
972 goto failure;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200973 }
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000974 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
975 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
Gerrit Renker73c9e022006-11-10 13:01:31 -0200976
977 return err;
978 }
979
980 if (!ipv6_addr_any(&np->rcv_saddr))
981 saddr = &np->rcv_saddr;
982
983 fl.proto = IPPROTO_DCCP;
984 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
985 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
986 fl.oif = sk->sk_bound_dev_if;
987 fl.fl_ip_dport = usin->sin6_port;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000988 fl.fl_ip_sport = inet->inet_sport;
Gerrit Renker73c9e022006-11-10 13:01:31 -0200989 security_sk_classify_flow(sk, &fl);
990
991 if (np->opt != NULL && np->opt->srcrt != NULL) {
992 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
993
994 ipv6_addr_copy(&final, &fl.fl6_dst);
995 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
996 final_p = &final;
997 }
998
999 err = ip6_dst_lookup(sk, &dst, &fl);
1000 if (err)
1001 goto failure;
1002
1003 if (final_p)
1004 ipv6_addr_copy(&fl.fl6_dst, final_p);
1005
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001006 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
David S. Miller14e50e52007-05-24 18:17:54 -07001007 if (err < 0) {
1008 if (err == -EREMOTE)
1009 err = ip6_dst_blackhole(sk, &dst, &fl);
1010 if (err < 0)
1011 goto failure;
1012 }
Gerrit Renker73c9e022006-11-10 13:01:31 -02001013
1014 if (saddr == NULL) {
1015 saddr = &fl.fl6_src;
1016 ipv6_addr_copy(&np->rcv_saddr, saddr);
1017 }
1018
1019 /* set the source address */
1020 ipv6_addr_copy(&np->saddr, saddr);
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001021 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001022
1023 __ip6_dst_store(sk, dst, NULL, NULL);
1024
1025 icsk->icsk_ext_hdr_len = 0;
1026 if (np->opt != NULL)
1027 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1028 np->opt->opt_nflen);
1029
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001030 inet->inet_dport = usin->sin6_port;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001031
1032 dccp_set_state(sk, DCCP_REQUESTING);
1033 err = inet6_hash_connect(&dccp_death_row, sk);
1034 if (err)
1035 goto late_failure;
Gerrit Renkerd7f73652006-11-13 13:34:38 -02001036
1037 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1038 np->daddr.s6_addr32,
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001039 inet->inet_sport,
1040 inet->inet_dport);
Gerrit Renker73c9e022006-11-10 13:01:31 -02001041 err = dccp_connect(sk);
1042 if (err)
1043 goto late_failure;
1044
1045 return 0;
1046
1047late_failure:
1048 dccp_set_state(sk, DCCP_CLOSED);
1049 __sk_dst_reset(sk);
1050failure:
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001051 inet->inet_dport = 0;
Gerrit Renker73c9e022006-11-10 13:01:31 -02001052 sk->sk_route_caps = 0;
1053 return err;
1054}
1055
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001056static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001057 .queue_xmit = inet6_csk_xmit,
1058 .send_check = dccp_v6_send_check,
1059 .rebuild_header = inet6_sk_rebuild_header,
1060 .conn_request = dccp_v6_conn_request,
1061 .syn_recv_sock = dccp_v6_request_recv_sock,
1062 .net_header_len = sizeof(struct ipv6hdr),
1063 .setsockopt = ipv6_setsockopt,
1064 .getsockopt = ipv6_getsockopt,
1065 .addr2sockaddr = inet6_csk_addr2sockaddr,
1066 .sockaddr_len = sizeof(struct sockaddr_in6),
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001067 .bind_conflict = inet6_csk_bind_conflict,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001068#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001069 .compat_setsockopt = compat_ipv6_setsockopt,
1070 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001071#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001072};
1073
1074/*
1075 * DCCP over IPv4 via INET6 API
1076 */
Stephen Hemminger3b401a82009-09-01 19:25:04 +00001077static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001078 .queue_xmit = ip_queue_xmit,
1079 .send_check = dccp_v4_send_check,
1080 .rebuild_header = inet_sk_rebuild_header,
1081 .conn_request = dccp_v6_conn_request,
1082 .syn_recv_sock = dccp_v6_request_recv_sock,
1083 .net_header_len = sizeof(struct iphdr),
1084 .setsockopt = ipv6_setsockopt,
1085 .getsockopt = ipv6_getsockopt,
1086 .addr2sockaddr = inet6_csk_addr2sockaddr,
1087 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001088#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001089 .compat_setsockopt = compat_ipv6_setsockopt,
1090 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001091#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001092};
1093
1094/* NOTE: A lot of things set to zero explicitly by call to
1095 * sk_alloc() so need not be done here.
1096 */
1097static int dccp_v6_init_sock(struct sock *sk)
1098{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001099 static __u8 dccp_v6_ctl_sock_initialized;
1100 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001101
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001102 if (err == 0) {
1103 if (unlikely(!dccp_v6_ctl_sock_initialized))
1104 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001105 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001106 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001107
1108 return err;
1109}
1110
Brian Haley7d06b2e2008-06-14 17:04:49 -07001111static void dccp_v6_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001112{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001113 dccp_destroy_sock(sk);
Brian Haley7d06b2e2008-06-14 17:04:49 -07001114 inet6_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001115}
1116
Gerrit Renker73c9e022006-11-10 13:01:31 -02001117static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1118 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1119};
1120
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001121static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001122 .name = "DCCPv6",
1123 .owner = THIS_MODULE,
1124 .close = dccp_close,
1125 .connect = dccp_v6_connect,
1126 .disconnect = dccp_disconnect,
1127 .ioctl = dccp_ioctl,
1128 .init = dccp_v6_init_sock,
1129 .setsockopt = dccp_setsockopt,
1130 .getsockopt = dccp_getsockopt,
1131 .sendmsg = dccp_sendmsg,
1132 .recvmsg = dccp_recvmsg,
1133 .backlog_rcv = dccp_v6_do_rcv,
1134 .hash = dccp_v6_hash,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001135 .unhash = inet_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001136 .accept = inet_csk_accept,
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -08001137 .get_port = inet_csk_get_port,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001138 .shutdown = dccp_shutdown,
1139 .destroy = dccp_v6_destroy_sock,
1140 .orphan_count = &dccp_orphan_count,
1141 .max_header = MAX_DCCP_HEADER,
1142 .obj_size = sizeof(struct dccp6_sock),
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001143 .slab_flags = SLAB_DESTROY_BY_RCU,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001144 .rsk_prot = &dccp6_request_sock_ops,
1145 .twsk_prot = &dccp6_timewait_sock_ops,
Pavel Emelyanov39d8cda2008-03-22 16:50:58 -07001146 .h.hashinfo = &dccp_hashinfo,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001147#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001148 .compat_setsockopt = compat_dccp_setsockopt,
1149 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001150#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001151};
1152
Alexey Dobriyan41135cc2009-09-14 12:22:28 +00001153static const struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001154 .handler = dccp_v6_rcv,
1155 .err_handler = dccp_v6_err,
1156 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001157};
1158
Alexey Dobriyan5708e862009-09-14 12:23:23 +00001159static const struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001160 .family = PF_INET6,
1161 .owner = THIS_MODULE,
1162 .release = inet6_release,
1163 .bind = inet6_bind,
1164 .connect = inet_stream_connect,
1165 .socketpair = sock_no_socketpair,
1166 .accept = inet_accept,
1167 .getname = inet6_getname,
1168 .poll = dccp_poll,
1169 .ioctl = inet6_ioctl,
1170 .listen = inet_dccp_listen,
1171 .shutdown = inet_shutdown,
1172 .setsockopt = sock_common_setsockopt,
1173 .getsockopt = sock_common_getsockopt,
1174 .sendmsg = inet_sendmsg,
1175 .recvmsg = sock_common_recvmsg,
1176 .mmap = sock_no_mmap,
1177 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001178#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001179 .compat_setsockopt = compat_sock_common_setsockopt,
1180 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001181#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001182};
1183
1184static struct inet_protosw dccp_v6_protosw = {
1185 .type = SOCK_DCCP,
1186 .protocol = IPPROTO_DCCP,
1187 .prot = &dccp_v6_prot,
1188 .ops = &inet6_dccp_ops,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001189 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001190};
1191
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001192static int __net_init dccp_v6_init_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001193{
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001194 if (dccp_hashinfo.bhash == NULL)
1195 return -ESOCKTNOSUPPORT;
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001196
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001197 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1198 SOCK_DCCP, IPPROTO_DCCP, net);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001199}
1200
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001201static void __net_exit dccp_v6_exit_net(struct net *net)
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001202{
Pavel Emelyanov334527d2008-04-13 22:32:45 -07001203 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001204}
1205
1206static struct pernet_operations dccp_v6_ops = {
1207 .init = dccp_v6_init_net,
1208 .exit = dccp_v6_exit_net,
1209};
1210
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001211static int __init dccp_v6_init(void)
1212{
1213 int err = proto_register(&dccp_v6_prot, 1);
1214
1215 if (err != 0)
1216 goto out;
1217
1218 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1219 if (err != 0)
1220 goto out_unregister_proto;
1221
1222 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001223
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001224 err = register_pernet_subsys(&dccp_v6_ops);
1225 if (err != 0)
1226 goto out_destroy_ctl_sock;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001227out:
1228 return err;
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001229
1230out_destroy_ctl_sock:
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001231 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1232 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001233out_unregister_proto:
1234 proto_unregister(&dccp_v6_prot);
1235 goto out;
1236}
1237
1238static void __exit dccp_v6_exit(void)
1239{
Pavel Emelyanov8231bd22008-04-13 22:32:02 -07001240 unregister_pernet_subsys(&dccp_v6_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001241 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1242 inet6_unregister_protosw(&dccp_v6_protosw);
1243 proto_unregister(&dccp_v6_prot);
1244}
1245
1246module_init(dccp_v6_init);
1247module_exit(dccp_v6_exit);
1248
1249/*
1250 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1251 * values directly, Also cover the case where the protocol is not specified,
1252 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1253 */
Jean Delvare7131c6c2007-10-21 16:45:03 -07001254MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1255MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001256MODULE_LICENSE("GPL");
1257MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1258MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");