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3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1 /*
2 * DCCP over IPv6
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
3 * Linux INET6 implementation
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
4 *
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
15 #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>
14c8502 [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h
Arnaldo Carvalho de Melo authored
22 #include <net/inet_sock.h>
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
23 #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>
aa0e4e4 @davem330 [DCCP]: ipv6.c needs net/ip6_checksum.c
davem330 authored
29 #include <net/ip6_checksum.h>
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
30 #include <net/xfrm.h>
31
32 #include "dccp.h"
33 #include "ipv6.h"
4b79f0a @imcdnzl [DCCP]: Fix default sequence window size
imcdnzl authored
34 #include "feat.h"
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
35
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
36 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
38
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
39 static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
40 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
41 struct request_sock *req);
42 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
43
44 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
45
46 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
47 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
48
49 static 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
55 static 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) {
c985ed7 [DCCP]: Move dccp_[un]hash from ipv4.c to the core
Arnaldo Carvalho de Melo authored
59 dccp_hash(sk);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
60 return;
61 }
62 local_bh_disable();
63 __inet6_hash(&dccp_hashinfo, sk);
64 local_bh_enable();
65 }
66 }
67
68 static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
69 struct in6_addr *saddr,
70 struct in6_addr *daddr,
3df80d9 [DCCP]: Introduce DCCPv6
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71 unsigned long base)
72 {
73 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
74 }
75
76 static __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);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
85
86 return secure_dccp_sequence_number(skb->nh.iph->daddr,
87 skb->nh.iph->saddr,
88 dh->dccph_dport,
89 dh->dccph_sport);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
90 }
91
45329e7 [DCCP] ipv6: cleanups
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92 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
3df80d9 [DCCP]: Introduce DCCPv6
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93 int addr_len)
94 {
45329e7 [DCCP] ipv6: cleanups
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95 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
Arnaldo Carvalho de Melo authored
96 struct inet_connection_sock *icsk = inet_csk(sk);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
97 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
45329e7 [DCCP] ipv6: cleanups
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108 if (addr_len < SIN6_LEN_RFC2133)
3df80d9 [DCCP]: Introduce DCCPv6
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109 return -EINVAL;
110
45329e7 [DCCP] ipv6: cleanups
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111 if (usin->sin6_family != AF_INET6)
3df80d9 [DCCP]: Introduce DCCPv6
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112 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 }
128 /*
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
129 * 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;
3df80d9 [DCCP]: Introduce DCCPv6
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133
134 addr_type = ipv6_addr_type(&usin->sin6_addr);
135
45329e7 [DCCP] ipv6: cleanups
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136 if (addr_type & IPV6_ADDR_MULTICAST)
3df80d9 [DCCP]: Introduce DCCPv6
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137 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 /*
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
161 * DCCP over IPv4
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
162 */
163 if (addr_type == IPV6_ADDR_MAPPED) {
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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164 u32 exthdrlen = icsk->icsk_ext_hdr_len;
3df80d9 [DCCP]: Introduce DCCPv6
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165 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
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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176 icsk->icsk_af_ops = &dccp_ipv6_mapped;
3df80d9 [DCCP]: Introduce DCCPv6
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177 sk->sk_backlog_rcv = dccp_v4_do_rcv;
178
179 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
180 if (err) {
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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181 icsk->icsk_ext_hdr_len = exthdrlen;
182 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
3df80d9 [DCCP]: Introduce DCCPv6
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183 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;
beb8d13 [MLSXFRM]: Add flow labeling
Venkat Yekkirala authored
204 security_sk_classify_flow(sk, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
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205
45329e7 [DCCP] ipv6: cleanups
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206 if (np->opt != NULL && np->opt->srcrt != NULL) {
207 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
208
3df80d9 [DCCP]: Introduce DCCPv6
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209 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;
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217
3df80d9 [DCCP]: Introduce DCCPv6
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218 if (final_p)
219 ipv6_addr_copy(&fl.fl6_dst, final_p);
220
45329e7 [DCCP] ipv6: cleanups
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221 err = xfrm_lookup(&dst, &fl, sk, 0);
222 if (err < 0)
3df80d9 [DCCP]: Introduce DCCPv6
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223 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
497c615 @herbertx [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls
herbertx authored
234 __ip6_dst_store(sk, dst, NULL);
3df80d9 [DCCP]: Introduce DCCPv6
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235
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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236 icsk->icsk_ext_hdr_len = 0;
45329e7 [DCCP] ipv6: cleanups
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237 if (np->opt != NULL)
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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238 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
239 np->opt->opt_nflen);
3df80d9 [DCCP]: Introduce DCCPv6
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240
241 inet->dport = usin->sin6_port;
242
243 dccp_set_state(sk, DCCP_REQUESTING);
d8313f5 [INET6]: Generalise tcp_v6_hash_connect
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244 err = inet6_hash_connect(&dccp_death_row, sk);
3df80d9 [DCCP]: Introduce DCCPv6
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245 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
260 late_failure:
261 dccp_set_state(sk, DCCP_CLOSED);
262 __sk_dst_reset(sk);
263 failure:
264 inet->dport = 0;
265 sk->sk_route_caps = 0;
266 return err;
267 }
268
269 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
60fe62e [DCCP]: sparse endianness annotations
Andrea Bittau authored
270 int type, int code, int offset, __be32 info)
3df80d9 [DCCP]: Introduce DCCPv6
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271 {
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,
280 &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
281
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) {
288 inet_twsk_put((struct inet_timewait_sock *)sk);
289 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) {
302 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);
311 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;
beb8d13 [MLSXFRM]: Add flow labeling
Venkat Yekkirala authored
326 security_sk_classify_flow(sk, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
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327
45329e7 [DCCP] ipv6: cleanups
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328 err = ip6_dst_lookup(sk, &dst, &fl);
329 if (err) {
3df80d9 [DCCP]: Introduce DCCPv6
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330 sk->sk_err_soft = -err;
331 goto out;
332 }
333
45329e7 [DCCP] ipv6: cleanups
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334 err = xfrm_lookup(&dst, &fl, sk, 0);
335 if (err < 0) {
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
336 sk->sk_err_soft = -err;
337 goto out;
338 }
339 } else
340 dst_hold(dst);
341
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
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342 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
3df80d9 [DCCP]: Introduce DCCPv6
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343 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));
45329e7 [DCCP] ipv6: cleanups
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362 if (req == NULL)
3df80d9 [DCCP]: Introduce DCCPv6
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363 goto out;
364
45329e7 [DCCP] ipv6: cleanups
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365 /*
366 * ICMPs are not backlogged, hence we cannot get an established
367 * socket here.
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
368 */
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.
45329e7 [DCCP] ipv6: cleanups
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381 It can, it SYNs are crossed. --ANK */
3df80d9 [DCCP]: Introduce DCCPv6
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382 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);
390 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
402 out:
403 bh_unlock_sock(sk);
404 sock_put(sk);
405 }
406
407
408 static 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;
4237c75 [MLSXFRM]: Auto-labeling of child sockets
Venkat Yekkirala authored
427 security_req_classify_flow(req, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
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428
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);
45329e7 [DCCP] ipv6: cleanups
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436
3df80d9 [DCCP]: Introduce DCCPv6
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437 if (rxopt->srcrt)
438 opt = ipv6_invert_rthdr(sk,
439 (struct ipv6_rt_hdr *)(pktopts->nh.raw +
440 rxopt->srcrt));
441 }
442
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443 if (opt != NULL && opt->srcrt != NULL) {
444 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
445
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
446 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;
45329e7 [DCCP] ipv6: cleanups
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454
3df80d9 [DCCP]: Introduce DCCPv6
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455 if (final_p)
456 ipv6_addr_copy(&fl.fl6_dst, final_p);
45329e7 [DCCP] ipv6: cleanups
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457
458 err = xfrm_lookup(&dst, &fl, sk, 0);
459 if (err < 0)
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
460 goto done;
461 }
462
463 skb = dccp_make_response(sk, dst, req);
464 if (skb != NULL) {
465 struct dccp_hdr *dh = dccp_hdr(skb);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
466
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
467 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
479 done:
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
480 if (opt != NULL && opt != np->opt)
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
481 sock_kfree_s(sk, opt, opt->tot_len);
0cbd782 [DCCP] ipv6: dccp_v6_send_response() has a DST leak too.
David S. Miller authored
482 dst_release(dst);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
483 return err;
484 }
485
486 static 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
492 static 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
6d6ee43 [TWSK]: Introduce struct timewait_sock_ops
Arnaldo Carvalho de Melo authored
501 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
502 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
503 };
504
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
505 static 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,
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
511 len, IPPROTO_DCCP,
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
512 csum_partial((char *)dh,
513 dh->dccph_doff << 2,
514 skb->csum));
515 }
516
517 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
518 {
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
519 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
520 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
521 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))
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
531 return;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
532
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
533 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
534 GFP_ATOMIC);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
535 if (skb == NULL)
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
536 return;
537
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
538 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
539
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
553 /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
554 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;
beb8d13 [MLSXFRM]: Add flow labeling
Venkat Yekkirala authored
572 security_skb_classify_flow(rxskb, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
573
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) {
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
577 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
578 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
c5fed15 [DCCP]: ditch dccp_v[46]_ctl_send_ack
Arnaldo Carvalho de Melo authored
587 static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
588 struct request_sock *req)
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
589 {
590 struct flowi fl;
591 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
592 const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
593 sizeof(struct dccp_hdr_ext) +
594 sizeof(struct dccp_hdr_ack_bits);
595 struct sk_buff *skb;
596
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
597 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
598 GFP_ATOMIC);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
599 if (skb == NULL)
600 return;
601
118b2c9 [DCCP]: Use sk->sk_prot->max_header consistently for non-data packets
Arnaldo Carvalho de Melo authored
602 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
603
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;
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
614
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
615 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;
4237c75 [MLSXFRM]: Auto-labeling of child sockets
Venkat Yekkirala authored
629 security_req_classify_flow(req, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
630
631 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
632 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
633 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
634 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
635 return;
636 }
637 }
638
639 kfree_skb(skb);
640 }
641
642 static 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));
661 if (nsk != NULL) {
662 if (nsk->sk_state != DCCP_TIME_WAIT) {
663 bh_lock_sock(nsk);
664 return nsk;
665 }
666 inet_twsk_put((struct inet_timewait_sock *)nsk);
667 return NULL;
668 }
669
670 return sk;
671 }
672
673 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
674 {
675 struct inet_request_sock *ireq;
676 struct dccp_sock dp;
677 struct request_sock *req;
678 struct dccp_request_sock *dreq;
679 struct inet6_request_sock *ireq6;
680 struct ipv6_pinfo *np = inet6_sk(sk);
60fe62e [DCCP]: sparse endianness annotations
Andrea Bittau authored
681 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
682 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
683 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
684
685 if (skb->protocol == htons(ETH_P_IP))
686 return dccp_v4_conn_request(sk, skb);
687
688 if (!ipv6_unicast_destination(skb))
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
689 goto drop;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
690
691 if (dccp_bad_service_code(sk, service)) {
692 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
693 goto drop;
694 }
695 /*
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
696 * There are no SYN attacks on IPv6, yet...
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
697 */
698 if (inet_csk_reqsk_queue_is_full(sk))
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
699 goto drop;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
700
701 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
702 goto drop;
703
704 req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
705 if (req == NULL)
706 goto drop;
707
708 /* FIXME: process options */
709
710 dccp_openreq_init(req, &dp, skb);
711
4237c75 [MLSXFRM]: Auto-labeling of child sockets
Venkat Yekkirala authored
712 if (security_inet_conn_request(sk, skb, req))
713 goto drop_and_free;
714
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
715 ireq6 = inet6_rsk(req);
716 ireq = inet_rsk(req);
717 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
718 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
4b79f0a @imcdnzl [DCCP]: Fix default sequence window size
imcdnzl authored
719 req->rcv_wnd = dccp_feat_default_sequence_window;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
720 ireq6->pktopts = NULL;
721
722 if (ipv6_opt_accepted(sk, skb) ||
723 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
724 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
725 atomic_inc(&skb->users);
726 ireq6->pktopts = skb;
727 }
728 ireq6->iif = sk->sk_bound_dev_if;
729
730 /* So that link locals have meaning */
731 if (!sk->sk_bound_dev_if &&
732 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
733 ireq6->iif = inet6_iif(skb);
734
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
735 /*
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
736 * Step 3: Process LISTEN state
737 *
738 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
739 *
740 * In fact we defer setting S.GSR, S.SWL, S.SWH to
741 * dccp_create_openreq_child.
742 */
743 dreq = dccp_rsk(req);
744 dreq->dreq_isr = dcb->dccpd_seq;
745 dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
746 dreq->dreq_service = service;
747
748 if (dccp_v6_send_response(sk, req, NULL))
749 goto drop_and_free;
750
751 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
752 return 0;
753
754 drop_and_free:
755 reqsk_free(req);
756 drop:
757 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
758 dcb->dccpd_reset_code = reset_code;
759 return -1;
760 }
761
762 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
763 struct sk_buff *skb,
764 struct request_sock *req,
765 struct dst_entry *dst)
766 {
767 struct inet6_request_sock *ireq6 = inet6_rsk(req);
768 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
769 struct inet_sock *newinet;
770 struct dccp_sock *newdp;
771 struct dccp6_sock *newdp6;
772 struct sock *newsk;
773 struct ipv6_txoptions *opt;
774
775 if (skb->protocol == htons(ETH_P_IP)) {
776 /*
777 * v6 mapped
778 */
779 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
780 if (newsk == NULL)
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
781 return NULL;
782
783 newdp6 = (struct dccp6_sock *)newsk;
784 newdp = dccp_sk(newsk);
785 newinet = inet_sk(newsk);
786 newinet->pinet6 = &newdp6->inet6;
787 newnp = inet6_sk(newsk);
788
789 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
790
791 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
792 newinet->daddr);
793
794 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
795 newinet->saddr);
796
797 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
798
799 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
800 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
801 newnp->pktoptions = NULL;
802 newnp->opt = NULL;
803 newnp->mcast_oif = inet6_iif(skb);
804 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
805
806 /*
807 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
808 * here, dccp_create_openreq_child now does this for us, see the comment in
809 * that function for the gory details. -acme
810 */
811
812 /* It is tricky place. Until this moment IPv4 tcp
813 worked with IPv6 icsk.icsk_af_ops.
814 Sync it now.
815 */
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
Arnaldo Carvalho de Melo authored
816 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
817
818 return newsk;
819 }
820
821 opt = np->opt;
822
823 if (sk_acceptq_is_full(sk))
824 goto out_overflow;
825
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
826 if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
827 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
828
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
829 if (rxopt->srcrt)
830 opt = ipv6_invert_rthdr(sk,
831 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
832 rxopt->srcrt));
833 }
834
835 if (dst == NULL) {
836 struct in6_addr *final_p = NULL, final;
837 struct flowi fl;
838
839 memset(&fl, 0, sizeof(fl));
840 fl.proto = IPPROTO_DCCP;
841 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
842 if (opt != NULL && opt->srcrt != NULL) {
843 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
844
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
845 ipv6_addr_copy(&final, &fl.fl6_dst);
846 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
847 final_p = &final;
848 }
849 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
850 fl.oif = sk->sk_bound_dev_if;
851 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
852 fl.fl_ip_sport = inet_sk(sk)->sport;
beb8d13 [MLSXFRM]: Add flow labeling
Venkat Yekkirala authored
853 security_sk_classify_flow(sk, &fl);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
854
855 if (ip6_dst_lookup(sk, &dst, &fl))
856 goto out;
857
858 if (final_p)
859 ipv6_addr_copy(&fl.fl6_dst, final_p);
860
861 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
862 goto out;
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
863 }
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
864
865 newsk = dccp_create_openreq_child(sk, req, skb);
866 if (newsk == NULL)
867 goto out;
868
869 /*
870 * No need to charge this sock to the relevant IPv6 refcnt debug socks
871 * count here, dccp_create_openreq_child now does this for us, see the
872 * comment in that function for the gory details. -acme
873 */
874
497c615 @herbertx [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls
herbertx authored
875 __ip6_dst_store(newsk, dst, NULL);
45329e7 [DCCP] ipv6: cleanups
Arnaldo Carvalho de Melo authored
876 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
877 NETIF_F_TSO);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
878 newdp6 = (struct dccp6_sock *)newsk;
879 newinet = inet_sk(newsk);
880 newinet->pinet6 = &newdp6->inet6;
881 newdp = dccp_sk(newsk);
882 newnp = inet6_sk(newsk);
883
884 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
885
886 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
887 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
888 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
889 newsk->sk_bound_dev_if = ireq6->iif;
890
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891 /* Now IPv6 options...
3df80d9 [DCCP]: Introduce DCCPv6
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892
893 First: no IPv4 options.
894 */
895 newinet->opt = NULL;
896
897 /* Clone RX bits */
898 newnp->rxopt.all = np->rxopt.all;
899
900 /* Clone pktoptions received with SYN */
901 newnp->pktoptions = NULL;
902 if (ireq6->pktopts != NULL) {
903 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
904 kfree_skb(ireq6->pktopts);
905 ireq6->pktopts = NULL;
906 if (newnp->pktoptions)
907 skb_set_owner_r(newnp->pktoptions, newsk);
908 }
909 newnp->opt = NULL;
910 newnp->mcast_oif = inet6_iif(skb);
911 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
912
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913 /*
914 * Clone native IPv6 options from listening socket (if any)
915 *
916 * Yes, keeping reference count would be much more clever, but we make
917 * one more one thing there: reattach optmem to newsk.
3df80d9 [DCCP]: Introduce DCCPv6
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918 */
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919 if (opt != NULL) {
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920 newnp->opt = ipv6_dup_options(newsk, opt);
921 if (opt != np->opt)
922 sock_kfree_s(sk, opt, opt->tot_len);
923 }
924
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925 inet_csk(newsk)->icsk_ext_hdr_len = 0;
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926 if (newnp->opt != NULL)
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927 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
928 newnp->opt->opt_flen);
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929
930 dccp_sync_mss(newsk, dst_mtu(dst));
931
932 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
933
934 __inet6_hash(&dccp_hashinfo, newsk);
935 inet_inherit_port(&dccp_hashinfo, sk, newsk);
936
937 return newsk;
938
939 out_overflow:
940 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
941 out:
942 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
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943 if (opt != NULL && opt != np->opt)
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944 sock_kfree_s(sk, opt, opt->tot_len);
945 dst_release(dst);
946 return NULL;
947 }
948
949 /* The socket must have it's spinlock held when we get
950 * here.
951 *
952 * We have a potential double-lock case here, so even when
953 * doing backlog processing we use the BH locking scheme.
954 * This is because we cannot sleep with the original spinlock
955 * held.
956 */
957 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
958 {
959 struct ipv6_pinfo *np = inet6_sk(sk);
960 struct sk_buff *opt_skb = NULL;
961
962 /* Imagine: socket is IPv6. IPv4 packet arrives,
963 goes to IPv4 receive handler and backlogged.
964 From backlog it always goes here. Kerboom...
965 Fortunately, dccp_rcv_established and rcv_established
966 handle them correctly, but it is not case with
967 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
968 */
969
970 if (skb->protocol == htons(ETH_P_IP))
971 return dccp_v4_do_rcv(sk, skb);
972
973 if (sk_filter(sk, skb, 0))
974 goto discard;
975
976 /*
45329e7 [DCCP] ipv6: cleanups
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977 * socket locking is here for SMP purposes as backlog rcv is currently
978 * called with bh processing disabled.
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
979 */
980
981 /* Do Stevens' IPV6_PKTOPTIONS.
982
983 Yes, guys, it is the only place in our code, where we
984 may make it not affecting IPv4.
985 The rest of code is protocol independent,
986 and I do not like idea to uglify IPv4.
987
988 Actually, all the idea behind IPV6_PKTOPTIONS
989 looks not very well thought. For now we latch
990 options, received in the last packet, enqueued
991 by tcp. Feel free to propose better solution.
992 --ANK (980728)
993 */
994 if (np->rxopt.all)
995 opt_skb = skb_clone(skb, GFP_ATOMIC);
996
997 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
998 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
999 goto reset;
1000 return 0;
1001 }
1002
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1003 if (sk->sk_state == DCCP_LISTEN) {
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1004 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1005
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1006 if (nsk == NULL)
1007 goto discard;
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1008 /*
1009 * Queue it on the new socket if the new socket is active,
1010 * otherwise we just shortcircuit this and continue with
1011 * the new socket..
1012 */
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1013 if (nsk != sk) {
3df80d9 [DCCP]: Introduce DCCPv6
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1014 if (dccp_child_process(sk, nsk, skb))
1015 goto reset;
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1016 if (opt_skb != NULL)
3df80d9 [DCCP]: Introduce DCCPv6
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1017 __kfree_skb(opt_skb);
1018 return 0;
1019 }
1020 }
1021
1022 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1023 goto reset;
1024 return 0;
1025
1026 reset:
1027 dccp_v6_ctl_send_reset(skb);
1028 discard:
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1029 if (opt_skb != NULL)
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1030 __kfree_skb(opt_skb);
1031 kfree_skb(skb);
1032 return 0;
1033 }
1034
951dbc8 @kaber [IPV6]: Move nextheader offset to the IP6CB
kaber authored
1035 static int dccp_v6_rcv(struct sk_buff **pskb)
3df80d9 [DCCP]: Introduce DCCPv6
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1036 {
1037 const struct dccp_hdr *dh;
1038 struct sk_buff *skb = *pskb;
1039 struct sock *sk;
1040
1041 /* Step 1: Check header basics: */
1042
1043 if (dccp_invalid_packet(skb))
1044 goto discard_it;
1045
1046 dh = dccp_hdr(skb);
1047
1048 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1049 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1050
1051 if (dccp_packet_without_ack(skb))
1052 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1053 else
1054 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1055
1056 /* Step 2:
1057 * Look up flow ID in table and get corresponding socket */
1058 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1059 dh->dccph_sport,
1060 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1061 inet6_iif(skb));
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1062 /*
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1063 * Step 2:
1064 * If no socket ...
1065 * Generate Reset(No Connection) unless P.type == Reset
1066 * Drop packet and return
1067 */
1068 if (sk == NULL)
1069 goto no_dccp_socket;
1070
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1071 /*
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1072 * Step 2:
1073 * ... or S.state == TIMEWAIT,
1074 * Generate Reset(No Connection) unless P.type == Reset
1075 * Drop packet and return
1076 */
1077 if (sk->sk_state == DCCP_TIME_WAIT)
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1078 goto do_time_wait;
3df80d9 [DCCP]: Introduce DCCPv6
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1079
1080 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1081 goto discard_and_relse;
1082
25995ff [SOCK]: Introduce sk_receive_skb
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1083 return sk_receive_skb(sk, skb) ? -1 : 0;
3df80d9 [DCCP]: Introduce DCCPv6
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1084
1085 no_dccp_socket:
1086 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1087 goto discard_it;
1088 /*
1089 * Step 2:
1090 * Generate Reset(No Connection) unless P.type == Reset
1091 * Drop packet and return
1092 */
1093 if (dh->dccph_type != DCCP_PKT_RESET) {
1094 DCCP_SKB_CB(skb)->dccpd_reset_code =
1095 DCCP_RESET_CODE_NO_CONNECTION;
1096 dccp_v6_ctl_send_reset(skb);
1097 }
1098 discard_it:
1099
1100 /*
1101 * Discard frame
1102 */
1103
1104 kfree_skb(skb);
1105 return 0;
1106
1107 discard_and_relse:
1108 sock_put(sk);
1109 goto discard_it;
1110
1111 do_time_wait:
1112 inet_twsk_put((struct inet_timewait_sock *)sk);
1113 goto no_dccp_socket;
1114 }
1115
1116 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
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1117 .queue_xmit = inet6_csk_xmit,
1118 .send_check = dccp_v6_send_check,
1119 .rebuild_header = inet6_sk_rebuild_header,
1120 .conn_request = dccp_v6_conn_request,
1121 .syn_recv_sock = dccp_v6_request_recv_sock,
1122 .net_header_len = sizeof(struct ipv6hdr),
1123 .setsockopt = ipv6_setsockopt,
1124 .getsockopt = ipv6_getsockopt,
1125 .addr2sockaddr = inet6_csk_addr2sockaddr,
1126 .sockaddr_len = sizeof(struct sockaddr_in6),
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1127 #ifdef CONFIG_COMPAT
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Arnaldo Carvalho de Melo authored
1128 .compat_setsockopt = compat_ipv6_setsockopt,
1129 .compat_getsockopt = compat_ipv6_getsockopt,
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Dmitry Mishin authored
1130 #endif
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1131 };
1132
1133 /*
1134 * DCCP over IPv4 via INET6 API
1135 */
1136 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
Arnaldo Carvalho de Melo authored
1137 .queue_xmit = ip_queue_xmit,
1138 .send_check = dccp_v4_send_check,
1139 .rebuild_header = inet_sk_rebuild_header,
1140 .conn_request = dccp_v6_conn_request,
1141 .syn_recv_sock = dccp_v6_request_recv_sock,
1142 .net_header_len = sizeof(struct iphdr),
1143 .setsockopt = ipv6_setsockopt,
1144 .getsockopt = ipv6_getsockopt,
1145 .addr2sockaddr = inet6_csk_addr2sockaddr,
1146 .sockaddr_len = sizeof(struct sockaddr_in6),
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Dmitry Mishin authored
1147 #ifdef CONFIG_COMPAT
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
Arnaldo Carvalho de Melo authored
1148 .compat_setsockopt = compat_ipv6_setsockopt,
1149 .compat_getsockopt = compat_ipv6_getsockopt,
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Dmitry Mishin authored
1150 #endif
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1151 };
1152
1153 /* NOTE: A lot of things set to zero explicitly by call to
1154 * sk_alloc() so need not be done here.
1155 */
1156 static int dccp_v6_init_sock(struct sock *sk)
1157 {
7247887 [DCCP] ipv6: Add missing ipv6 control socket
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1158 static __u8 dccp_v6_ctl_sock_initialized;
1159 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1160
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
1161 if (err == 0) {
1162 if (unlikely(!dccp_v6_ctl_sock_initialized))
1163 dccp_v6_ctl_sock_initialized = 1;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1164 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
1165 }
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1166
1167 return err;
1168 }
1169
1170 static int dccp_v6_destroy_sock(struct sock *sk)
1171 {
3e0fadc [DCCP]: Move dccp_v4_{init,destroy}_sock to the core
Arnaldo Carvalho de Melo authored
1172 dccp_destroy_sock(sk);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1173 return inet6_destroy_sock(sk);
1174 }
1175
1176 static struct proto dccp_v6_prot = {
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
Arnaldo Carvalho de Melo authored
1177 .name = "DCCPv6",
1178 .owner = THIS_MODULE,
1179 .close = dccp_close,
1180 .connect = dccp_v6_connect,
1181 .disconnect = dccp_disconnect,
1182 .ioctl = dccp_ioctl,
1183 .init = dccp_v6_init_sock,
1184 .setsockopt = dccp_setsockopt,
1185 .getsockopt = dccp_getsockopt,
1186 .sendmsg = dccp_sendmsg,
1187 .recvmsg = dccp_recvmsg,
1188 .backlog_rcv = dccp_v6_do_rcv,
1189 .hash = dccp_v6_hash,
1190 .unhash = dccp_unhash,
1191 .accept = inet_csk_accept,
1192 .get_port = dccp_v6_get_port,
1193 .shutdown = dccp_shutdown,
1194 .destroy = dccp_v6_destroy_sock,
1195 .orphan_count = &dccp_orphan_count,
1196 .max_header = MAX_DCCP_HEADER,
1197 .obj_size = sizeof(struct dccp6_sock),
1198 .rsk_prot = &dccp6_request_sock_ops,
1199 .twsk_prot = &dccp6_timewait_sock_ops,
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1200 #ifdef CONFIG_COMPAT
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
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1201 .compat_setsockopt = compat_dccp_setsockopt,
1202 .compat_getsockopt = compat_dccp_getsockopt,
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Dmitry Mishin authored
1203 #endif
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1204 };
1205
1206 static struct inet6_protocol dccp_v6_protocol = {
45329e7 [DCCP] ipv6: cleanups
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1207 .handler = dccp_v6_rcv,
1208 .err_handler = dccp_v6_err,
1209 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1210 };
1211
1212 static struct proto_ops inet6_dccp_ops = {
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
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1213 .family = PF_INET6,
1214 .owner = THIS_MODULE,
1215 .release = inet6_release,
1216 .bind = inet6_bind,
1217 .connect = inet_stream_connect,
1218 .socketpair = sock_no_socketpair,
1219 .accept = inet_accept,
1220 .getname = inet6_getname,
1221 .poll = dccp_poll,
1222 .ioctl = inet6_ioctl,
1223 .listen = inet_dccp_listen,
1224 .shutdown = inet_shutdown,
1225 .setsockopt = sock_common_setsockopt,
1226 .getsockopt = sock_common_getsockopt,
1227 .sendmsg = inet_sendmsg,
1228 .recvmsg = sock_common_recvmsg,
1229 .mmap = sock_no_mmap,
1230 .sendpage = sock_no_sendpage,
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Dmitry Mishin authored
1231 #ifdef CONFIG_COMPAT
543d9cf [NET]: Identation & other cleanups related to compat_[gs]etsockopt cset
Arnaldo Carvalho de Melo authored
1232 .compat_setsockopt = compat_sock_common_setsockopt,
1233 .compat_getsockopt = compat_sock_common_getsockopt,
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Dmitry Mishin authored
1234 #endif
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1235 };
1236
1237 static struct inet_protosw dccp_v6_protosw = {
1238 .type = SOCK_DCCP,
1239 .protocol = IPPROTO_DCCP,
1240 .prot = &dccp_v6_prot,
1241 .ops = &inet6_dccp_ops,
1242 .capability = -1,
d83d846 [IP_SOCKGLUE]: Remove most of the tcp specific calls
Arnaldo Carvalho de Melo authored
1243 .flags = INET_PROTOSW_ICSK,
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1244 };
1245
1246 static int __init dccp_v6_init(void)
1247 {
1248 int err = proto_register(&dccp_v6_prot, 1);
1249
1250 if (err != 0)
1251 goto out;
1252
1253 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1254 if (err != 0)
1255 goto out_unregister_proto;
1256
1257 inet6_register_protosw(&dccp_v6_protosw);
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
1258
c4d9390 [ICSK]: Introduce inet_csk_ctl_sock_create
Arnaldo Carvalho de Melo authored
1259 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1260 SOCK_DCCP, IPPROTO_DCCP);
1261 if (err != 0)
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
1262 goto out_unregister_protosw;
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1263 out:
1264 return err;
7247887 [DCCP] ipv6: Add missing ipv6 control socket
Arnaldo Carvalho de Melo authored
1265 out_unregister_protosw:
1266 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1267 inet6_unregister_protosw(&dccp_v6_protosw);
3df80d9 [DCCP]: Introduce DCCPv6
Arnaldo Carvalho de Melo authored
1268 out_unregister_proto:
1269 proto_unregister(&dccp_v6_prot);
1270 goto out;
1271 }
1272
1273 static void __exit dccp_v6_exit(void)
1274 {
1275 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1276 inet6_unregister_protosw(&dccp_v6_protosw);
1277 proto_unregister(&dccp_v6_prot);
1278 }
1279
1280 module_init(dccp_v6_init);
1281 module_exit(dccp_v6_exit);
1282
1283 /*
1284 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1285 * values directly, Also cover the case where the protocol is not specified,
1286 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1287 */
1288 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1289 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1290 MODULE_LICENSE("GPL");
1291 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1292 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
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