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Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001/*
2 * DCCP over IPv6
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08003 * Linux INET6 implementation
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08004 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080015#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/xfrm.h>
18
19#include <net/addrconf.h>
20#include <net/inet_common.h>
21#include <net/inet_hashtables.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020022#include <net/inet_sock.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080023#include <net/inet6_connection_sock.h>
24#include <net/inet6_hashtables.h>
25#include <net/ip6_route.h>
26#include <net/ipv6.h>
27#include <net/protocol.h>
28#include <net/transp_v6.h>
David S. Milleraa0e4e42006-01-06 22:55:39 -080029#include <net/ip6_checksum.h>
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080030#include <net/xfrm.h>
31
32#include "dccp.h"
33#include "ipv6.h"
Ian McDonald4b79f0a2006-07-23 23:33:28 -070034#include "feat.h"
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080035
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -080036/* Socket used for sending RSTs and ACKs */
37static struct socket *dccp_v6_ctl_socket;
38
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080039static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
40static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
41 struct request_sock *req);
42static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
43
44static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
45
46static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
47static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
48
49static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
50{
51 return inet_csk_get_port(&dccp_hashinfo, sk, snum,
52 inet6_csk_bind_conflict);
53}
54
55static void dccp_v6_hash(struct sock *sk)
56{
57 if (sk->sk_state != DCCP_CLOSED) {
58 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -080059 dccp_hash(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080060 return;
61 }
62 local_bh_disable();
63 __inet6_hash(&dccp_hashinfo, sk);
64 local_bh_enable();
65 }
66}
67
68static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -080069 struct in6_addr *saddr,
70 struct in6_addr *daddr,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080071 unsigned long base)
72{
73 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
74}
75
76static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
77{
78 const struct dccp_hdr *dh = dccp_hdr(skb);
79
80 if (skb->protocol == htons(ETH_P_IPV6))
81 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
82 skb->nh.ipv6h->saddr.s6_addr32,
83 dh->dccph_dport,
84 dh->dccph_sport);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -080085
86 return secure_dccp_sequence_number(skb->nh.iph->daddr,
87 skb->nh.iph->saddr,
88 dh->dccph_dport,
89 dh->dccph_sport);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080090}
91
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -080092static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080093 int addr_len)
94{
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -080095 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080096 struct inet_connection_sock *icsk = inet_csk(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -080097 struct inet_sock *inet = inet_sk(sk);
98 struct ipv6_pinfo *np = inet6_sk(sk);
99 struct dccp_sock *dp = dccp_sk(sk);
100 struct in6_addr *saddr = NULL, *final_p = NULL, final;
101 struct flowi fl;
102 struct dst_entry *dst;
103 int addr_type;
104 int err;
105
106 dp->dccps_role = DCCP_ROLE_CLIENT;
107
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800108 if (addr_len < SIN6_LEN_RFC2133)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800109 return -EINVAL;
110
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800111 if (usin->sin6_family != AF_INET6)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800112 return -EAFNOSUPPORT;
113
114 memset(&fl, 0, sizeof(fl));
115
116 if (np->sndflow) {
117 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
118 IP6_ECN_flow_init(fl.fl6_flowlabel);
119 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
120 struct ip6_flowlabel *flowlabel;
121 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
122 if (flowlabel == NULL)
123 return -EINVAL;
124 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
125 fl6_sock_release(flowlabel);
126 }
127 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800128 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800129 * connect() to INADDR_ANY means loopback (BSD'ism).
130 */
131 if (ipv6_addr_any(&usin->sin6_addr))
132 usin->sin6_addr.s6_addr[15] = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800133
134 addr_type = ipv6_addr_type(&usin->sin6_addr);
135
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800136 if (addr_type & IPV6_ADDR_MULTICAST)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800137 return -ENETUNREACH;
138
139 if (addr_type & IPV6_ADDR_LINKLOCAL) {
140 if (addr_len >= sizeof(struct sockaddr_in6) &&
141 usin->sin6_scope_id) {
142 /* If interface is set while binding, indices
143 * must coincide.
144 */
145 if (sk->sk_bound_dev_if &&
146 sk->sk_bound_dev_if != usin->sin6_scope_id)
147 return -EINVAL;
148
149 sk->sk_bound_dev_if = usin->sin6_scope_id;
150 }
151
152 /* Connect to link-local address requires an interface */
153 if (!sk->sk_bound_dev_if)
154 return -EINVAL;
155 }
156
157 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
158 np->flow_label = fl.fl6_flowlabel;
159
160 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800161 * DCCP over IPv4
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800162 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800163 if (addr_type == IPV6_ADDR_MAPPED) {
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800164 u32 exthdrlen = icsk->icsk_ext_hdr_len;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800165 struct sockaddr_in sin;
166
167 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
168
169 if (__ipv6_only_sock(sk))
170 return -ENETUNREACH;
171
172 sin.sin_family = AF_INET;
173 sin.sin_port = usin->sin6_port;
174 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
175
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800176 icsk->icsk_af_ops = &dccp_ipv6_mapped;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800177 sk->sk_backlog_rcv = dccp_v4_do_rcv;
178
179 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800180 if (err) {
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800181 icsk->icsk_ext_hdr_len = exthdrlen;
182 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800183 sk->sk_backlog_rcv = dccp_v6_do_rcv;
184 goto failure;
185 } else {
186 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
187 inet->saddr);
188 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
189 inet->rcv_saddr);
190 }
191
192 return err;
193 }
194
195 if (!ipv6_addr_any(&np->rcv_saddr))
196 saddr = &np->rcv_saddr;
197
198 fl.proto = IPPROTO_DCCP;
199 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
200 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
201 fl.oif = sk->sk_bound_dev_if;
202 fl.fl_ip_dport = usin->sin6_port;
203 fl.fl_ip_sport = inet->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700204 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800205
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800206 if (np->opt != NULL && np->opt->srcrt != NULL) {
207 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
208
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800209 ipv6_addr_copy(&final, &fl.fl6_dst);
210 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
211 final_p = &final;
212 }
213
214 err = ip6_dst_lookup(sk, &dst, &fl);
215 if (err)
216 goto failure;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800217
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800218 if (final_p)
219 ipv6_addr_copy(&fl.fl6_dst, final_p);
220
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800221 err = xfrm_lookup(&dst, &fl, sk, 0);
222 if (err < 0)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800223 goto failure;
224
225 if (saddr == NULL) {
226 saddr = &fl.fl6_src;
227 ipv6_addr_copy(&np->rcv_saddr, saddr);
228 }
229
230 /* set the source address */
231 ipv6_addr_copy(&np->saddr, saddr);
232 inet->rcv_saddr = LOOPBACK4_IPV6;
233
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700234 __ip6_dst_store(sk, dst, NULL, NULL);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800235
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800236 icsk->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800237 if (np->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800238 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
239 np->opt->opt_nflen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800240
241 inet->dport = usin->sin6_port;
242
243 dccp_set_state(sk, DCCP_REQUESTING);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800244 err = inet6_hash_connect(&dccp_death_row, sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800245 if (err)
246 goto late_failure;
247 /* FIXME */
248#if 0
249 dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
250 np->daddr.s6_addr32,
251 inet->sport,
252 inet->dport);
253#endif
254 err = dccp_connect(sk);
255 if (err)
256 goto late_failure;
257
258 return 0;
259
260late_failure:
261 dccp_set_state(sk, DCCP_CLOSED);
262 __sk_dst_reset(sk);
263failure:
264 inet->dport = 0;
265 sk->sk_route_caps = 0;
266 return err;
267}
268
269static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800270 int type, int code, int offset, __be32 info)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800271{
272 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
273 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
274 struct ipv6_pinfo *np;
275 struct sock *sk;
276 int err;
277 __u64 seq;
278
279 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
YOSHIFUJI Hideakif2776ff2006-11-21 17:41:56 -0800280 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800281
282 if (sk == NULL) {
283 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
284 return;
285 }
286
287 if (sk->sk_state == DCCP_TIME_WAIT) {
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700288 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800289 return;
290 }
291
292 bh_lock_sock(sk);
293 if (sock_owned_by_user(sk))
294 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
295
296 if (sk->sk_state == DCCP_CLOSED)
297 goto out;
298
299 np = inet6_sk(sk);
300
301 if (type == ICMPV6_PKT_TOOBIG) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800302 struct dst_entry *dst = NULL;
303
304 if (sock_owned_by_user(sk))
305 goto out;
306 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
307 goto out;
308
309 /* icmp should have updated the destination cache entry */
310 dst = __sk_dst_check(sk, np->dst_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800311 if (dst == NULL) {
312 struct inet_sock *inet = inet_sk(sk);
313 struct flowi fl;
314
315 /* BUGGG_FUTURE: Again, it is not clear how
316 to handle rthdr case. Ignore this complexity
317 for now.
318 */
319 memset(&fl, 0, sizeof(fl));
320 fl.proto = IPPROTO_DCCP;
321 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
322 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
323 fl.oif = sk->sk_bound_dev_if;
324 fl.fl_ip_dport = inet->dport;
325 fl.fl_ip_sport = inet->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700326 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800327
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800328 err = ip6_dst_lookup(sk, &dst, &fl);
329 if (err) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800330 sk->sk_err_soft = -err;
331 goto out;
332 }
333
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800334 err = xfrm_lookup(&dst, &fl, sk, 0);
335 if (err < 0) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800336 sk->sk_err_soft = -err;
337 goto out;
338 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800339 } else
340 dst_hold(dst);
341
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800342 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800343 dccp_sync_mss(sk, dst_mtu(dst));
344 } /* else let the usual retransmit timer handle it */
345 dst_release(dst);
346 goto out;
347 }
348
349 icmpv6_err_convert(type, code, &err);
350
351 seq = DCCP_SKB_CB(skb)->dccpd_seq;
352 /* Might be for an request_sock */
353 switch (sk->sk_state) {
354 struct request_sock *req, **prev;
355 case DCCP_LISTEN:
356 if (sock_owned_by_user(sk))
357 goto out;
358
359 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
360 &hdr->daddr, &hdr->saddr,
361 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800362 if (req == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800363 goto out;
364
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800365 /*
366 * ICMPs are not backlogged, hence we cannot get an established
367 * socket here.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800368 */
369 BUG_TRAP(req->sk == NULL);
370
371 if (seq != dccp_rsk(req)->dreq_iss) {
372 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
373 goto out;
374 }
375
376 inet_csk_reqsk_queue_drop(sk, req, prev);
377 goto out;
378
379 case DCCP_REQUESTING:
380 case DCCP_RESPOND: /* Cannot happen.
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800381 It can, it SYNs are crossed. --ANK */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800382 if (!sock_owned_by_user(sk)) {
383 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
384 sk->sk_err = err;
385 /*
386 * Wake people up to see the error
387 * (see connect in sock.c)
388 */
389 sk->sk_error_report(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800390 dccp_done(sk);
391 } else
392 sk->sk_err_soft = err;
393 goto out;
394 }
395
396 if (!sock_owned_by_user(sk) && np->recverr) {
397 sk->sk_err = err;
398 sk->sk_error_report(sk);
399 } else
400 sk->sk_err_soft = err;
401
402out:
403 bh_unlock_sock(sk);
404 sock_put(sk);
405}
406
407
408static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
409 struct dst_entry *dst)
410{
411 struct inet6_request_sock *ireq6 = inet6_rsk(req);
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct sk_buff *skb;
414 struct ipv6_txoptions *opt = NULL;
415 struct in6_addr *final_p = NULL, final;
416 struct flowi fl;
417 int err = -1;
418
419 memset(&fl, 0, sizeof(fl));
420 fl.proto = IPPROTO_DCCP;
421 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
422 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
423 fl.fl6_flowlabel = 0;
424 fl.oif = ireq6->iif;
425 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
426 fl.fl_ip_sport = inet_sk(sk)->sport;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700427 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800428
429 if (dst == NULL) {
430 opt = np->opt;
431 if (opt == NULL &&
432 np->rxopt.bits.osrcrt == 2 &&
433 ireq6->pktopts) {
434 struct sk_buff *pktopts = ireq6->pktopts;
435 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800436
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800437 if (rxopt->srcrt)
438 opt = ipv6_invert_rthdr(sk,
439 (struct ipv6_rt_hdr *)(pktopts->nh.raw +
440 rxopt->srcrt));
441 }
442
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800443 if (opt != NULL && opt->srcrt != NULL) {
444 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
445
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800446 ipv6_addr_copy(&final, &fl.fl6_dst);
447 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
448 final_p = &final;
449 }
450
451 err = ip6_dst_lookup(sk, &dst, &fl);
452 if (err)
453 goto done;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800454
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800455 if (final_p)
456 ipv6_addr_copy(&fl.fl6_dst, final_p);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800457
458 err = xfrm_lookup(&dst, &fl, sk, 0);
459 if (err < 0)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800460 goto done;
461 }
462
463 skb = dccp_make_response(sk, dst, req);
464 if (skb != NULL) {
465 struct dccp_hdr *dh = dccp_hdr(skb);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800466
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800467 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
468 &ireq6->loc_addr,
469 &ireq6->rmt_addr,
470 csum_partial((char *)dh,
471 skb->len,
472 skb->csum));
473 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
474 err = ip6_xmit(sk, skb, &fl, opt, 0);
475 if (err == NET_XMIT_CN)
476 err = 0;
477 }
478
479done:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800480 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800481 sock_kfree_s(sk, opt, opt->tot_len);
David S. Miller0cbd7822006-01-31 17:53:37 -0800482 dst_release(dst);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800483 return err;
484}
485
486static void dccp_v6_reqsk_destructor(struct request_sock *req)
487{
488 if (inet6_rsk(req)->pktopts != NULL)
489 kfree_skb(inet6_rsk(req)->pktopts);
490}
491
492static struct request_sock_ops dccp6_request_sock_ops = {
493 .family = AF_INET6,
494 .obj_size = sizeof(struct dccp6_request_sock),
495 .rtx_syn_ack = dccp_v6_send_response,
496 .send_ack = dccp_v6_reqsk_send_ack,
497 .destructor = dccp_v6_reqsk_destructor,
498 .send_reset = dccp_v6_ctl_send_reset,
499};
500
Arnaldo Carvalho de Melo6d6ee432005-12-13 23:25:19 -0800501static struct timewait_sock_ops dccp6_timewait_sock_ops = {
502 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
503};
504
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800505static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
506{
507 struct ipv6_pinfo *np = inet6_sk(sk);
508 struct dccp_hdr *dh = dccp_hdr(skb);
509
510 dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800511 len, IPPROTO_DCCP,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800512 csum_partial((char *)dh,
513 dh->dccph_doff << 2,
514 skb->csum));
515}
516
517static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
518{
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800519 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800520 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800521 sizeof(struct dccp_hdr_ext) +
522 sizeof(struct dccp_hdr_reset);
523 struct sk_buff *skb;
524 struct flowi fl;
525 u64 seqno;
526
527 if (rxdh->dccph_type == DCCP_PKT_RESET)
528 return;
529
530 if (!ipv6_unicast_destination(rxskb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800531 return;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800532
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800533 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
534 GFP_ATOMIC);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800535 if (skb == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800536 return;
537
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800538 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800539
540 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
541 dh = dccp_hdr(skb);
542 memset(dh, 0, dccp_hdr_reset_len);
543
544 /* Swap the send and the receive. */
545 dh->dccph_type = DCCP_PKT_RESET;
546 dh->dccph_sport = rxdh->dccph_dport;
547 dh->dccph_dport = rxdh->dccph_sport;
548 dh->dccph_doff = dccp_hdr_reset_len / 4;
549 dh->dccph_x = 1;
550 dccp_hdr_reset(skb)->dccph_reset_code =
551 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
552
Gerrit Renker0e64e942006-10-24 16:17:51 -0700553 /* See "8.3.1. Abnormal Termination" in RFC 4340 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800554 seqno = 0;
555 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
556 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
557
558 dccp_hdr_set_seq(dh, seqno);
559 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
560 DCCP_SKB_CB(rxskb)->dccpd_seq);
561
562 memset(&fl, 0, sizeof(fl));
563 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
564 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
565 dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
566 sizeof(*dh), IPPROTO_DCCP,
567 skb->csum);
568 fl.proto = IPPROTO_DCCP;
569 fl.oif = inet6_iif(rxskb);
570 fl.fl_ip_dport = dh->dccph_dport;
571 fl.fl_ip_sport = dh->dccph_sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700572 security_skb_classify_flow(rxskb, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800573
574 /* sk = NULL, but it is safe for now. RST socket required. */
575 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
576 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800577 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800578 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
579 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
580 return;
581 }
582 }
583
584 kfree_skb(skb);
585}
586
Arnaldo Carvalho de Meloc5fed152006-03-20 22:31:26 -0800587static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
588 struct request_sock *req)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800589{
590 struct flowi fl;
591 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800592 const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800593 sizeof(struct dccp_hdr_ext) +
594 sizeof(struct dccp_hdr_ack_bits);
595 struct sk_buff *skb;
596
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800597 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
598 GFP_ATOMIC);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800599 if (skb == NULL)
600 return;
601
Arnaldo Carvalho de Melo118b2c92006-03-20 22:31:09 -0800602 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800603
604 skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
605 dh = dccp_hdr(skb);
606 memset(dh, 0, dccp_hdr_ack_len);
607
608 /* Build DCCP header and checksum it. */
609 dh->dccph_type = DCCP_PKT_ACK;
610 dh->dccph_sport = rxdh->dccph_dport;
611 dh->dccph_dport = rxdh->dccph_sport;
612 dh->dccph_doff = dccp_hdr_ack_len / 4;
613 dh->dccph_x = 1;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800614
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800615 dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
616 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
617 DCCP_SKB_CB(rxskb)->dccpd_seq);
618
619 memset(&fl, 0, sizeof(fl));
620 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
621 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
622
623 /* FIXME: calculate checksum, IPv4 also should... */
624
625 fl.proto = IPPROTO_DCCP;
626 fl.oif = inet6_iif(rxskb);
627 fl.fl_ip_dport = dh->dccph_dport;
628 fl.fl_ip_sport = dh->dccph_sport;
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700629 security_req_classify_flow(req, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800630
631 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
632 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800633 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800634 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
635 return;
636 }
637 }
638
639 kfree_skb(skb);
640}
641
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800642static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
643{
644 const struct dccp_hdr *dh = dccp_hdr(skb);
645 const struct ipv6hdr *iph = skb->nh.ipv6h;
646 struct sock *nsk;
647 struct request_sock **prev;
648 /* Find possible connection requests. */
649 struct request_sock *req = inet6_csk_search_req(sk, &prev,
650 dh->dccph_sport,
651 &iph->saddr,
652 &iph->daddr,
653 inet6_iif(skb));
654 if (req != NULL)
655 return dccp_check_req(sk, skb, req, prev);
656
657 nsk = __inet6_lookup_established(&dccp_hashinfo,
658 &iph->saddr, dh->dccph_sport,
659 &iph->daddr, ntohs(dh->dccph_dport),
660 inet6_iif(skb));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800661 if (nsk != NULL) {
662 if (nsk->sk_state != DCCP_TIME_WAIT) {
663 bh_lock_sock(nsk);
664 return nsk;
665 }
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -0700666 inet_twsk_put(inet_twsk(nsk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800667 return NULL;
668 }
669
670 return sk;
671}
672
673static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
674{
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800675 struct dccp_sock dp;
676 struct request_sock *req;
677 struct dccp_request_sock *dreq;
678 struct inet6_request_sock *ireq6;
679 struct ipv6_pinfo *np = inet6_sk(sk);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800680 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800681 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
682 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
683
684 if (skb->protocol == htons(ETH_P_IP))
685 return dccp_v4_conn_request(sk, skb);
686
687 if (!ipv6_unicast_destination(skb))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800688 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800689
690 if (dccp_bad_service_code(sk, service)) {
691 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
692 goto drop;
693 }
694 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800695 * There are no SYN attacks on IPv6, yet...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800696 */
697 if (inet_csk_reqsk_queue_is_full(sk))
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800698 goto drop;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800699
700 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
701 goto drop;
702
Gerrit Renker82709532006-10-11 16:26:54 +0100703 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800704 if (req == NULL)
705 goto drop;
706
707 /* FIXME: process options */
708
709 dccp_openreq_init(req, &dp, skb);
710
Venkat Yekkirala4237c752006-07-24 23:32:50 -0700711 if (security_inet_conn_request(sk, skb, req))
712 goto drop_and_free;
713
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800714 ireq6 = inet6_rsk(req);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800715 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
716 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
Ian McDonald4b79f0a2006-07-23 23:33:28 -0700717 req->rcv_wnd = dccp_feat_default_sequence_window;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800718 ireq6->pktopts = NULL;
719
720 if (ipv6_opt_accepted(sk, skb) ||
721 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
722 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
723 atomic_inc(&skb->users);
724 ireq6->pktopts = skb;
725 }
726 ireq6->iif = sk->sk_bound_dev_if;
727
728 /* So that link locals have meaning */
729 if (!sk->sk_bound_dev_if &&
730 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
731 ireq6->iif = inet6_iif(skb);
732
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800733 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800734 * Step 3: Process LISTEN state
735 *
736 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
737 *
738 * In fact we defer setting S.GSR, S.SWL, S.SWH to
739 * dccp_create_openreq_child.
740 */
741 dreq = dccp_rsk(req);
742 dreq->dreq_isr = dcb->dccpd_seq;
743 dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
744 dreq->dreq_service = service;
745
746 if (dccp_v6_send_response(sk, req, NULL))
747 goto drop_and_free;
748
749 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
750 return 0;
751
752drop_and_free:
753 reqsk_free(req);
754drop:
755 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
756 dcb->dccpd_reset_code = reset_code;
757 return -1;
758}
759
760static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
761 struct sk_buff *skb,
762 struct request_sock *req,
763 struct dst_entry *dst)
764{
765 struct inet6_request_sock *ireq6 = inet6_rsk(req);
766 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
767 struct inet_sock *newinet;
768 struct dccp_sock *newdp;
769 struct dccp6_sock *newdp6;
770 struct sock *newsk;
771 struct ipv6_txoptions *opt;
772
773 if (skb->protocol == htons(ETH_P_IP)) {
774 /*
775 * v6 mapped
776 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800777 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800778 if (newsk == NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800779 return NULL;
780
781 newdp6 = (struct dccp6_sock *)newsk;
782 newdp = dccp_sk(newsk);
783 newinet = inet_sk(newsk);
784 newinet->pinet6 = &newdp6->inet6;
785 newnp = inet6_sk(newsk);
786
787 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
788
789 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
790 newinet->daddr);
791
792 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
793 newinet->saddr);
794
795 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
796
797 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
798 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
799 newnp->pktoptions = NULL;
800 newnp->opt = NULL;
801 newnp->mcast_oif = inet6_iif(skb);
802 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
803
804 /*
805 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
806 * here, dccp_create_openreq_child now does this for us, see the comment in
807 * that function for the gory details. -acme
808 */
809
810 /* It is tricky place. Until this moment IPv4 tcp
811 worked with IPv6 icsk.icsk_af_ops.
812 Sync it now.
813 */
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800814 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800815
816 return newsk;
817 }
818
819 opt = np->opt;
820
821 if (sk_acceptq_is_full(sk))
822 goto out_overflow;
823
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800824 if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
825 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
826
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800827 if (rxopt->srcrt)
828 opt = ipv6_invert_rthdr(sk,
829 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
830 rxopt->srcrt));
831 }
832
833 if (dst == NULL) {
834 struct in6_addr *final_p = NULL, final;
835 struct flowi fl;
836
837 memset(&fl, 0, sizeof(fl));
838 fl.proto = IPPROTO_DCCP;
839 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800840 if (opt != NULL && opt->srcrt != NULL) {
841 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
842
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800843 ipv6_addr_copy(&final, &fl.fl6_dst);
844 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
845 final_p = &final;
846 }
847 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
848 fl.oif = sk->sk_bound_dev_if;
849 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
850 fl.fl_ip_sport = inet_sk(sk)->sport;
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700851 security_sk_classify_flow(sk, &fl);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800852
853 if (ip6_dst_lookup(sk, &dst, &fl))
854 goto out;
855
856 if (final_p)
857 ipv6_addr_copy(&fl.fl6_dst, final_p);
858
859 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
860 goto out;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800861 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800862
863 newsk = dccp_create_openreq_child(sk, req, skb);
864 if (newsk == NULL)
865 goto out;
866
867 /*
868 * No need to charge this sock to the relevant IPv6 refcnt debug socks
869 * count here, dccp_create_openreq_child now does this for us, see the
870 * comment in that function for the gory details. -acme
871 */
872
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700873 __ip6_dst_store(newsk, dst, NULL, NULL);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800874 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
875 NETIF_F_TSO);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800876 newdp6 = (struct dccp6_sock *)newsk;
877 newinet = inet_sk(newsk);
878 newinet->pinet6 = &newdp6->inet6;
879 newdp = dccp_sk(newsk);
880 newnp = inet6_sk(newsk);
881
882 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
883
884 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
885 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
886 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
887 newsk->sk_bound_dev_if = ireq6->iif;
888
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800889 /* Now IPv6 options...
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800890
891 First: no IPv4 options.
892 */
893 newinet->opt = NULL;
894
895 /* Clone RX bits */
896 newnp->rxopt.all = np->rxopt.all;
897
898 /* Clone pktoptions received with SYN */
899 newnp->pktoptions = NULL;
900 if (ireq6->pktopts != NULL) {
901 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
902 kfree_skb(ireq6->pktopts);
903 ireq6->pktopts = NULL;
904 if (newnp->pktoptions)
905 skb_set_owner_r(newnp->pktoptions, newsk);
906 }
907 newnp->opt = NULL;
908 newnp->mcast_oif = inet6_iif(skb);
909 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
910
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800911 /*
912 * Clone native IPv6 options from listening socket (if any)
913 *
914 * Yes, keeping reference count would be much more clever, but we make
915 * one more one thing there: reattach optmem to newsk.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800916 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800917 if (opt != NULL) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800918 newnp->opt = ipv6_dup_options(newsk, opt);
919 if (opt != np->opt)
920 sock_kfree_s(sk, opt, opt->tot_len);
921 }
922
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800923 inet_csk(newsk)->icsk_ext_hdr_len = 0;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800924 if (newnp->opt != NULL)
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800925 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
926 newnp->opt->opt_flen);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800927
928 dccp_sync_mss(newsk, dst_mtu(dst));
929
930 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
931
932 __inet6_hash(&dccp_hashinfo, newsk);
933 inet_inherit_port(&dccp_hashinfo, sk, newsk);
934
935 return newsk;
936
937out_overflow:
938 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
939out:
940 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800941 if (opt != NULL && opt != np->opt)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800942 sock_kfree_s(sk, opt, opt->tot_len);
943 dst_release(dst);
944 return NULL;
945}
946
947/* The socket must have it's spinlock held when we get
948 * here.
949 *
950 * We have a potential double-lock case here, so even when
951 * doing backlog processing we use the BH locking scheme.
952 * This is because we cannot sleep with the original spinlock
953 * held.
954 */
955static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
956{
957 struct ipv6_pinfo *np = inet6_sk(sk);
958 struct sk_buff *opt_skb = NULL;
959
960 /* Imagine: socket is IPv6. IPv4 packet arrives,
961 goes to IPv4 receive handler and backlogged.
962 From backlog it always goes here. Kerboom...
963 Fortunately, dccp_rcv_established and rcv_established
964 handle them correctly, but it is not case with
965 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
966 */
967
968 if (skb->protocol == htons(ETH_P_IP))
969 return dccp_v4_do_rcv(sk, skb);
970
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700971 if (sk_filter(sk, skb))
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800972 goto discard;
973
974 /*
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -0800975 * socket locking is here for SMP purposes as backlog rcv is currently
976 * called with bh processing disabled.
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -0800977 */
978
979 /* Do Stevens' IPV6_PKTOPTIONS.
980
981 Yes, guys, it is the only place in our code, where we
982 may make it not affecting IPv4.
983 The rest of code is protocol independent,
984 and I do not like idea to uglify IPv4.
985
986 Actually, all the idea behind IPV6_PKTOPTIONS
987 looks not very well thought. For now we latch
988 options, received in the last packet, enqueued
989 by tcp. Feel free to propose better solution.
990 --ANK (980728)
991 */
992 if (np->rxopt.all)
993 opt_skb = skb_clone(skb, GFP_ATOMIC);
994
995 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
996 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
997 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -0700998 if (opt_skb) {
999 /* This is where we would goto ipv6_pktoptions. */
1000 __kfree_skb(opt_skb);
1001 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001002 return 0;
1003 }
1004
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001005 if (sk->sk_state == DCCP_LISTEN) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001006 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001007
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001008 if (nsk == NULL)
1009 goto discard;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001010 /*
1011 * Queue it on the new socket if the new socket is active,
1012 * otherwise we just shortcircuit this and continue with
1013 * the new socket..
1014 */
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001015 if (nsk != sk) {
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001016 if (dccp_child_process(sk, nsk, skb))
1017 goto reset;
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001018 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001019 __kfree_skb(opt_skb);
1020 return 0;
1021 }
1022 }
1023
1024 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1025 goto reset;
David S. Millerfd169f12006-10-20 19:44:17 -07001026 if (opt_skb) {
1027 /* This is where we would goto ipv6_pktoptions. */
1028 __kfree_skb(opt_skb);
1029 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001030 return 0;
1031
1032reset:
1033 dccp_v6_ctl_send_reset(skb);
1034discard:
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001035 if (opt_skb != NULL)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001036 __kfree_skb(opt_skb);
1037 kfree_skb(skb);
1038 return 0;
1039}
1040
Patrick McHardy951dbc82006-01-06 23:02:34 -08001041static int dccp_v6_rcv(struct sk_buff **pskb)
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001042{
1043 const struct dccp_hdr *dh;
1044 struct sk_buff *skb = *pskb;
1045 struct sock *sk;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001046
1047 /* Step 1: Check header basics: */
1048
1049 if (dccp_invalid_packet(skb))
1050 goto discard_it;
1051
1052 dh = dccp_hdr(skb);
1053
1054 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1055 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1056
1057 if (dccp_packet_without_ack(skb))
1058 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1059 else
1060 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1061
1062 /* Step 2:
1063 * Look up flow ID in table and get corresponding socket */
1064 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1065 dh->dccph_sport,
1066 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1067 inet6_iif(skb));
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001068 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001069 * Step 2:
1070 * If no socket ...
1071 * Generate Reset(No Connection) unless P.type == Reset
1072 * Drop packet and return
1073 */
1074 if (sk == NULL)
1075 goto no_dccp_socket;
1076
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001077 /*
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001078 * Step 2:
1079 * ... or S.state == TIMEWAIT,
1080 * Generate Reset(No Connection) unless P.type == Reset
1081 * Drop packet and return
1082 */
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001083 if (sk->sk_state == DCCP_TIME_WAIT)
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001084 goto do_time_wait;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001085
1086 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1087 goto discard_and_relse;
1088
Arnaldo Carvalho de Melo25995ff2005-12-27 02:42:22 -02001089 return sk_receive_skb(sk, skb) ? -1 : 0;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001090
1091no_dccp_socket:
1092 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1093 goto discard_it;
1094 /*
1095 * Step 2:
1096 * Generate Reset(No Connection) unless P.type == Reset
1097 * Drop packet and return
1098 */
1099 if (dh->dccph_type != DCCP_PKT_RESET) {
1100 DCCP_SKB_CB(skb)->dccpd_reset_code =
1101 DCCP_RESET_CODE_NO_CONNECTION;
1102 dccp_v6_ctl_send_reset(skb);
1103 }
1104discard_it:
1105
1106 /*
1107 * Discard frame
1108 */
1109
1110 kfree_skb(skb);
1111 return 0;
1112
1113discard_and_relse:
1114 sock_put(sk);
1115 goto discard_it;
1116
1117do_time_wait:
YOSHIFUJI Hideaki9469c7b2006-10-10 19:41:46 -07001118 inet_twsk_put(inet_twsk(sk));
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001119 goto no_dccp_socket;
1120}
1121
1122static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001123 .queue_xmit = inet6_csk_xmit,
1124 .send_check = dccp_v6_send_check,
1125 .rebuild_header = inet6_sk_rebuild_header,
1126 .conn_request = dccp_v6_conn_request,
1127 .syn_recv_sock = dccp_v6_request_recv_sock,
1128 .net_header_len = sizeof(struct ipv6hdr),
1129 .setsockopt = ipv6_setsockopt,
1130 .getsockopt = ipv6_getsockopt,
1131 .addr2sockaddr = inet6_csk_addr2sockaddr,
1132 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001133#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001134 .compat_setsockopt = compat_ipv6_setsockopt,
1135 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001136#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001137};
1138
1139/*
1140 * DCCP over IPv4 via INET6 API
1141 */
1142static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001143 .queue_xmit = ip_queue_xmit,
1144 .send_check = dccp_v4_send_check,
1145 .rebuild_header = inet_sk_rebuild_header,
1146 .conn_request = dccp_v6_conn_request,
1147 .syn_recv_sock = dccp_v6_request_recv_sock,
1148 .net_header_len = sizeof(struct iphdr),
1149 .setsockopt = ipv6_setsockopt,
1150 .getsockopt = ipv6_getsockopt,
1151 .addr2sockaddr = inet6_csk_addr2sockaddr,
1152 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001153#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001154 .compat_setsockopt = compat_ipv6_setsockopt,
1155 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001156#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001157};
1158
1159/* NOTE: A lot of things set to zero explicitly by call to
1160 * sk_alloc() so need not be done here.
1161 */
1162static int dccp_v6_init_sock(struct sock *sk)
1163{
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001164 static __u8 dccp_v6_ctl_sock_initialized;
1165 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001166
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001167 if (err == 0) {
1168 if (unlikely(!dccp_v6_ctl_sock_initialized))
1169 dccp_v6_ctl_sock_initialized = 1;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001170 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001171 }
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001172
1173 return err;
1174}
1175
1176static int dccp_v6_destroy_sock(struct sock *sk)
1177{
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -08001178 dccp_destroy_sock(sk);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001179 return inet6_destroy_sock(sk);
1180}
1181
1182static struct proto dccp_v6_prot = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001183 .name = "DCCPv6",
1184 .owner = THIS_MODULE,
1185 .close = dccp_close,
1186 .connect = dccp_v6_connect,
1187 .disconnect = dccp_disconnect,
1188 .ioctl = dccp_ioctl,
1189 .init = dccp_v6_init_sock,
1190 .setsockopt = dccp_setsockopt,
1191 .getsockopt = dccp_getsockopt,
1192 .sendmsg = dccp_sendmsg,
1193 .recvmsg = dccp_recvmsg,
1194 .backlog_rcv = dccp_v6_do_rcv,
1195 .hash = dccp_v6_hash,
1196 .unhash = dccp_unhash,
1197 .accept = inet_csk_accept,
1198 .get_port = dccp_v6_get_port,
1199 .shutdown = dccp_shutdown,
1200 .destroy = dccp_v6_destroy_sock,
1201 .orphan_count = &dccp_orphan_count,
1202 .max_header = MAX_DCCP_HEADER,
1203 .obj_size = sizeof(struct dccp6_sock),
1204 .rsk_prot = &dccp6_request_sock_ops,
1205 .twsk_prot = &dccp6_timewait_sock_ops,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001206#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001207 .compat_setsockopt = compat_dccp_setsockopt,
1208 .compat_getsockopt = compat_dccp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001209#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001210};
1211
1212static struct inet6_protocol dccp_v6_protocol = {
Arnaldo Carvalho de Melo45329e72006-03-20 22:01:29 -08001213 .handler = dccp_v6_rcv,
1214 .err_handler = dccp_v6_err,
1215 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001216};
1217
1218static struct proto_ops inet6_dccp_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001219 .family = PF_INET6,
1220 .owner = THIS_MODULE,
1221 .release = inet6_release,
1222 .bind = inet6_bind,
1223 .connect = inet_stream_connect,
1224 .socketpair = sock_no_socketpair,
1225 .accept = inet_accept,
1226 .getname = inet6_getname,
1227 .poll = dccp_poll,
1228 .ioctl = inet6_ioctl,
1229 .listen = inet_dccp_listen,
1230 .shutdown = inet_shutdown,
1231 .setsockopt = sock_common_setsockopt,
1232 .getsockopt = sock_common_getsockopt,
1233 .sendmsg = inet_sendmsg,
1234 .recvmsg = sock_common_recvmsg,
1235 .mmap = sock_no_mmap,
1236 .sendpage = sock_no_sendpage,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001237#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001238 .compat_setsockopt = compat_sock_common_setsockopt,
1239 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001240#endif
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001241};
1242
1243static struct inet_protosw dccp_v6_protosw = {
1244 .type = SOCK_DCCP,
1245 .protocol = IPPROTO_DCCP,
1246 .prot = &dccp_v6_prot,
1247 .ops = &inet6_dccp_ops,
1248 .capability = -1,
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -08001249 .flags = INET_PROTOSW_ICSK,
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001250};
1251
1252static int __init dccp_v6_init(void)
1253{
1254 int err = proto_register(&dccp_v6_prot, 1);
1255
1256 if (err != 0)
1257 goto out;
1258
1259 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1260 if (err != 0)
1261 goto out_unregister_proto;
1262
1263 inet6_register_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001264
Arnaldo Carvalho de Meloc4d93902006-03-20 22:01:03 -08001265 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1266 SOCK_DCCP, IPPROTO_DCCP);
1267 if (err != 0)
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001268 goto out_unregister_protosw;
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001269out:
1270 return err;
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -08001271out_unregister_protosw:
1272 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1273 inet6_unregister_protosw(&dccp_v6_protosw);
Arnaldo Carvalho de Melo3df80d92005-12-13 23:24:53 -08001274out_unregister_proto:
1275 proto_unregister(&dccp_v6_prot);
1276 goto out;
1277}
1278
1279static void __exit dccp_v6_exit(void)
1280{
1281 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1282 inet6_unregister_protosw(&dccp_v6_protosw);
1283 proto_unregister(&dccp_v6_prot);
1284}
1285
1286module_init(dccp_v6_init);
1287module_exit(dccp_v6_exit);
1288
1289/*
1290 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1291 * values directly, Also cover the case where the protocol is not specified,
1292 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1293 */
1294MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1295MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1296MODULE_LICENSE("GPL");
1297MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1298MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");