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Commit | Line | Data |
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3df80d93 ACM |
1 | /* |
2 | * DCCP over IPv6 | |
45329e71 | 3 | * Linux INET6 implementation |
3df80d93 ACM |
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 | ||
3df80d93 ACM |
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> | |
14c85021 | 22 | #include <net/inet_sock.h> |
3df80d93 ACM |
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> | |
aa0e4e4a | 29 | #include <net/ip6_checksum.h> |
3df80d93 ACM |
30 | #include <net/xfrm.h> |
31 | ||
32 | #include "dccp.h" | |
33 | #include "ipv6.h" | |
4b79f0af | 34 | #include "feat.h" |
3df80d93 | 35 | |
13f51d82 | 36 | /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ |
72478873 | 37 | |
3df80d93 ACM |
38 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
39 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
40 | ||
3df80d93 ACM |
41 | static void dccp_v6_hash(struct sock *sk) |
42 | { | |
43 | if (sk->sk_state != DCCP_CLOSED) { | |
44 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
ab1e0a13 | 45 | inet_hash(sk); |
3df80d93 ACM |
46 | return; |
47 | } | |
48 | local_bh_disable(); | |
ab1e0a13 | 49 | __inet6_hash(sk); |
3df80d93 ACM |
50 | local_bh_enable(); |
51 | } | |
52 | } | |
53 | ||
6f4e5fff | 54 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 55 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
56 | struct in6_addr *saddr, |
57 | struct in6_addr *daddr) | |
3df80d93 | 58 | { |
6f4e5fff GR |
59 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
60 | } | |
61 | ||
62 | static inline void dccp_v6_send_check(struct sock *sk, int unused_value, | |
63 | struct sk_buff *skb) | |
64 | { | |
65 | struct ipv6_pinfo *np = inet6_sk(sk); | |
66 | struct dccp_hdr *dh = dccp_hdr(skb); | |
67 | ||
68 | dccp_csum_outgoing(skb); | |
69 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr); | |
3df80d93 ACM |
70 | } |
71 | ||
7d533f94 | 72 | static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr, |
8109b02b | 73 | __be16 sport, __be16 dport ) |
3df80d93 | 74 | { |
d7f7365f GR |
75 | return secure_tcpv6_sequence_number(saddr, daddr, sport, dport); |
76 | } | |
77 | ||
78 | static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb) | |
79 | { | |
0660e03f ACM |
80 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
81 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
82 | dccp_hdr(skb)->dccph_dport, |
83 | dccp_hdr(skb)->dccph_sport ); | |
84 | ||
3df80d93 ACM |
85 | } |
86 | ||
3df80d93 | 87 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
60fe62e7 | 88 | int type, int code, int offset, __be32 info) |
3df80d93 ACM |
89 | { |
90 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; | |
91 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
e0bcfb0c | 92 | struct dccp_sock *dp; |
3df80d93 ACM |
93 | struct ipv6_pinfo *np; |
94 | struct sock *sk; | |
95 | int err; | |
96 | __u64 seq; | |
ca12a1a4 | 97 | struct net *net = dev_net(skb->dev); |
3df80d93 | 98 | |
ca12a1a4 | 99 | sk = inet6_lookup(net, &dccp_hashinfo, |
671a1c74 | 100 | &hdr->daddr, dh->dccph_dport, |
d86e0dac | 101 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
102 | |
103 | if (sk == NULL) { | |
104 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
105 | return; | |
106 | } | |
107 | ||
108 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 109 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
110 | return; |
111 | } | |
112 | ||
113 | bh_lock_sock(sk); | |
114 | if (sock_owned_by_user(sk)) | |
de0744af | 115 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
116 | |
117 | if (sk->sk_state == DCCP_CLOSED) | |
118 | goto out; | |
119 | ||
e0bcfb0c WY |
120 | dp = dccp_sk(sk); |
121 | seq = dccp_hdr_seq(dh); | |
122 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && | |
123 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
124 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
125 | goto out; | |
126 | } | |
127 | ||
3df80d93 ACM |
128 | np = inet6_sk(sk); |
129 | ||
130 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
131 | struct dst_entry *dst = NULL; |
132 | ||
133 | if (sock_owned_by_user(sk)) | |
134 | goto out; | |
135 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
136 | goto out; | |
137 | ||
138 | /* icmp should have updated the destination cache entry */ | |
139 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
140 | if (dst == NULL) { |
141 | struct inet_sock *inet = inet_sk(sk); | |
142 | struct flowi fl; | |
143 | ||
144 | /* BUGGG_FUTURE: Again, it is not clear how | |
145 | to handle rthdr case. Ignore this complexity | |
146 | for now. | |
147 | */ | |
148 | memset(&fl, 0, sizeof(fl)); | |
149 | fl.proto = IPPROTO_DCCP; | |
150 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
151 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
152 | fl.oif = sk->sk_bound_dev_if; | |
153 | fl.fl_ip_dport = inet->dport; | |
154 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 155 | security_sk_classify_flow(sk, &fl); |
3df80d93 | 156 | |
45329e71 ACM |
157 | err = ip6_dst_lookup(sk, &dst, &fl); |
158 | if (err) { | |
3df80d93 ACM |
159 | sk->sk_err_soft = -err; |
160 | goto out; | |
161 | } | |
162 | ||
45329e71 ACM |
163 | err = xfrm_lookup(&dst, &fl, sk, 0); |
164 | if (err < 0) { | |
3df80d93 ACM |
165 | sk->sk_err_soft = -err; |
166 | goto out; | |
167 | } | |
3df80d93 ACM |
168 | } else |
169 | dst_hold(dst); | |
170 | ||
d83d8461 | 171 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
172 | dccp_sync_mss(sk, dst_mtu(dst)); |
173 | } /* else let the usual retransmit timer handle it */ | |
174 | dst_release(dst); | |
175 | goto out; | |
176 | } | |
177 | ||
178 | icmpv6_err_convert(type, code, &err); | |
179 | ||
3df80d93 ACM |
180 | /* Might be for an request_sock */ |
181 | switch (sk->sk_state) { | |
182 | struct request_sock *req, **prev; | |
183 | case DCCP_LISTEN: | |
184 | if (sock_owned_by_user(sk)) | |
185 | goto out; | |
186 | ||
187 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
188 | &hdr->daddr, &hdr->saddr, | |
189 | inet6_iif(skb)); | |
45329e71 | 190 | if (req == NULL) |
3df80d93 ACM |
191 | goto out; |
192 | ||
45329e71 ACM |
193 | /* |
194 | * ICMPs are not backlogged, hence we cannot get an established | |
195 | * socket here. | |
3df80d93 | 196 | */ |
547b792c | 197 | WARN_ON(req->sk != NULL); |
3df80d93 ACM |
198 | |
199 | if (seq != dccp_rsk(req)->dreq_iss) { | |
de0744af | 200 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
201 | goto out; |
202 | } | |
203 | ||
204 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
205 | goto out; | |
206 | ||
207 | case DCCP_REQUESTING: | |
208 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 209 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
210 | if (!sock_owned_by_user(sk)) { |
211 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
212 | sk->sk_err = err; | |
213 | /* | |
214 | * Wake people up to see the error | |
215 | * (see connect in sock.c) | |
216 | */ | |
217 | sk->sk_error_report(sk); | |
3df80d93 ACM |
218 | dccp_done(sk); |
219 | } else | |
220 | sk->sk_err_soft = err; | |
221 | goto out; | |
222 | } | |
223 | ||
224 | if (!sock_owned_by_user(sk) && np->recverr) { | |
225 | sk->sk_err = err; | |
226 | sk->sk_error_report(sk); | |
227 | } else | |
228 | sk->sk_err_soft = err; | |
229 | ||
230 | out: | |
231 | bh_unlock_sock(sk); | |
232 | sock_put(sk); | |
233 | } | |
234 | ||
235 | ||
fd80eb94 | 236 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 ACM |
237 | { |
238 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
239 | struct ipv6_pinfo *np = inet6_sk(sk); | |
240 | struct sk_buff *skb; | |
241 | struct ipv6_txoptions *opt = NULL; | |
242 | struct in6_addr *final_p = NULL, final; | |
243 | struct flowi fl; | |
244 | int err = -1; | |
fd80eb94 | 245 | struct dst_entry *dst; |
3df80d93 ACM |
246 | |
247 | memset(&fl, 0, sizeof(fl)); | |
248 | fl.proto = IPPROTO_DCCP; | |
249 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
250 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
251 | fl.fl6_flowlabel = 0; | |
252 | fl.oif = ireq6->iif; | |
253 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
254 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
4237c75c | 255 | security_req_classify_flow(req, &fl); |
3df80d93 | 256 | |
fd80eb94 | 257 | opt = np->opt; |
3df80d93 | 258 | |
fd80eb94 DL |
259 | if (opt != NULL && opt->srcrt != NULL) { |
260 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
45329e71 | 261 | |
fd80eb94 DL |
262 | ipv6_addr_copy(&final, &fl.fl6_dst); |
263 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
264 | final_p = &final; | |
265 | } | |
3df80d93 | 266 | |
fd80eb94 DL |
267 | err = ip6_dst_lookup(sk, &dst, &fl); |
268 | if (err) | |
269 | goto done; | |
45329e71 | 270 | |
fd80eb94 DL |
271 | if (final_p) |
272 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 | 273 | |
fd80eb94 DL |
274 | err = xfrm_lookup(&dst, &fl, sk, 0); |
275 | if (err < 0) | |
276 | goto done; | |
3df80d93 ACM |
277 | |
278 | skb = dccp_make_response(sk, dst, req); | |
279 | if (skb != NULL) { | |
280 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 281 | |
6f4e5fff GR |
282 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
283 | &ireq6->loc_addr, | |
284 | &ireq6->rmt_addr); | |
3df80d93 ACM |
285 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
286 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
b9df3cb8 | 287 | err = net_xmit_eval(err); |
3df80d93 ACM |
288 | } |
289 | ||
290 | done: | |
45329e71 | 291 | if (opt != NULL && opt != np->opt) |
3df80d93 | 292 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 293 | dst_release(dst); |
3df80d93 ACM |
294 | return err; |
295 | } | |
296 | ||
297 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
298 | { | |
299 | if (inet6_rsk(req)->pktopts != NULL) | |
300 | kfree_skb(inet6_rsk(req)->pktopts); | |
301 | } | |
302 | ||
cfb6eeb4 | 303 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 304 | { |
0660e03f | 305 | struct ipv6hdr *rxip6h; |
3df80d93 ACM |
306 | struct sk_buff *skb; |
307 | struct flowi fl; | |
334527d3 PE |
308 | struct net *net = dev_net(rxskb->dst->dev); |
309 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; | |
3df80d93 | 310 | |
e356d37a | 311 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
312 | return; |
313 | ||
314 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 315 | return; |
3df80d93 | 316 | |
02047741 | 317 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 318 | if (skb == NULL) |
8109b02b | 319 | return; |
3df80d93 | 320 | |
0660e03f | 321 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
322 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
323 | &rxip6h->daddr); | |
6f4e5fff | 324 | |
3df80d93 | 325 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
326 | ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); |
327 | ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); | |
6f4e5fff | 328 | |
3df80d93 ACM |
329 | fl.proto = IPPROTO_DCCP; |
330 | fl.oif = inet6_iif(rxskb); | |
e356d37a GR |
331 | fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; |
332 | fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; | |
beb8d13b | 333 | security_skb_classify_flow(rxskb, &fl); |
3df80d93 ACM |
334 | |
335 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
02047741 | 336 | if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) { |
3df80d93 | 337 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { |
02047741 | 338 | ip6_xmit(ctl_sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
339 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
340 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
341 | return; | |
342 | } | |
343 | } | |
344 | ||
345 | kfree_skb(skb); | |
346 | } | |
347 | ||
73c9e02c GR |
348 | static struct request_sock_ops dccp6_request_sock_ops = { |
349 | .family = AF_INET6, | |
350 | .obj_size = sizeof(struct dccp6_request_sock), | |
351 | .rtx_syn_ack = dccp_v6_send_response, | |
352 | .send_ack = dccp_reqsk_send_ack, | |
353 | .destructor = dccp_v6_reqsk_destructor, | |
354 | .send_reset = dccp_v6_ctl_send_reset, | |
355 | }; | |
356 | ||
3df80d93 ACM |
357 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
358 | { | |
359 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 360 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
361 | struct sock *nsk; |
362 | struct request_sock **prev; | |
363 | /* Find possible connection requests. */ | |
364 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
365 | dh->dccph_sport, | |
366 | &iph->saddr, | |
367 | &iph->daddr, | |
368 | inet6_iif(skb)); | |
369 | if (req != NULL) | |
370 | return dccp_check_req(sk, skb, req, prev); | |
371 | ||
671a1c74 | 372 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
373 | &iph->saddr, dh->dccph_sport, |
374 | &iph->daddr, ntohs(dh->dccph_dport), | |
375 | inet6_iif(skb)); | |
3df80d93 ACM |
376 | if (nsk != NULL) { |
377 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
378 | bh_lock_sock(nsk); | |
379 | return nsk; | |
380 | } | |
9469c7b4 | 381 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
382 | return NULL; |
383 | } | |
384 | ||
385 | return sk; | |
386 | } | |
387 | ||
388 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
389 | { | |
3df80d93 ACM |
390 | struct request_sock *req; |
391 | struct dccp_request_sock *dreq; | |
392 | struct inet6_request_sock *ireq6; | |
393 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 394 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 395 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
396 | |
397 | if (skb->protocol == htons(ETH_P_IP)) | |
398 | return dccp_v4_conn_request(sk, skb); | |
399 | ||
400 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 401 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
402 | |
403 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 404 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 405 | goto drop; |
8109b02b | 406 | } |
3df80d93 | 407 | /* |
45329e71 | 408 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 409 | */ |
4a5409a5 | 410 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 411 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 412 | goto drop; |
3df80d93 ACM |
413 | |
414 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
415 | goto drop; | |
416 | ||
82709531 | 417 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
418 | if (req == NULL) |
419 | goto drop; | |
420 | ||
cf557926 | 421 | dccp_reqsk_init(req, skb); |
3df80d93 | 422 | |
8b819412 GR |
423 | dreq = dccp_rsk(req); |
424 | if (dccp_parse_options(sk, dreq, skb)) | |
425 | goto drop_and_free; | |
426 | ||
4237c75c VY |
427 | if (security_inet_conn_request(sk, skb, req)) |
428 | goto drop_and_free; | |
429 | ||
3df80d93 | 430 | ireq6 = inet6_rsk(req); |
0660e03f ACM |
431 | ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); |
432 | ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); | |
3df80d93 ACM |
433 | |
434 | if (ipv6_opt_accepted(sk, skb) || | |
435 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
436 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
437 | atomic_inc(&skb->users); | |
438 | ireq6->pktopts = skb; | |
439 | } | |
440 | ireq6->iif = sk->sk_bound_dev_if; | |
441 | ||
442 | /* So that link locals have meaning */ | |
443 | if (!sk->sk_bound_dev_if && | |
444 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
445 | ireq6->iif = inet6_iif(skb); | |
446 | ||
45329e71 | 447 | /* |
3df80d93 ACM |
448 | * Step 3: Process LISTEN state |
449 | * | |
d83ca5ac | 450 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 451 | * |
d83ca5ac GR |
452 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
453 | * dccp_create_openreq_child. | |
3df80d93 | 454 | */ |
3df80d93 | 455 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 456 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
457 | dreq->dreq_service = service; |
458 | ||
fd80eb94 | 459 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
460 | goto drop_and_free; |
461 | ||
462 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
463 | return 0; | |
464 | ||
465 | drop_and_free: | |
466 | reqsk_free(req); | |
467 | drop: | |
468 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
469 | return -1; |
470 | } | |
471 | ||
472 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
473 | struct sk_buff *skb, | |
474 | struct request_sock *req, | |
475 | struct dst_entry *dst) | |
476 | { | |
477 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
478 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
479 | struct inet_sock *newinet; | |
480 | struct dccp_sock *newdp; | |
481 | struct dccp6_sock *newdp6; | |
482 | struct sock *newsk; | |
483 | struct ipv6_txoptions *opt; | |
484 | ||
485 | if (skb->protocol == htons(ETH_P_IP)) { | |
486 | /* | |
487 | * v6 mapped | |
488 | */ | |
3df80d93 | 489 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 490 | if (newsk == NULL) |
3df80d93 ACM |
491 | return NULL; |
492 | ||
493 | newdp6 = (struct dccp6_sock *)newsk; | |
494 | newdp = dccp_sk(newsk); | |
495 | newinet = inet_sk(newsk); | |
496 | newinet->pinet6 = &newdp6->inet6; | |
497 | newnp = inet6_sk(newsk); | |
498 | ||
499 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
500 | ||
501 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
502 | newinet->daddr); | |
503 | ||
504 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
505 | newinet->saddr); | |
506 | ||
507 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
508 | ||
509 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
510 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
511 | newnp->pktoptions = NULL; | |
512 | newnp->opt = NULL; | |
513 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 514 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
515 | |
516 | /* | |
517 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
518 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
519 | * that function for the gory details. -acme | |
520 | */ | |
521 | ||
522 | /* It is tricky place. Until this moment IPv4 tcp | |
523 | worked with IPv6 icsk.icsk_af_ops. | |
524 | Sync it now. | |
525 | */ | |
d83d8461 | 526 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
527 | |
528 | return newsk; | |
529 | } | |
530 | ||
531 | opt = np->opt; | |
532 | ||
533 | if (sk_acceptq_is_full(sk)) | |
534 | goto out_overflow; | |
535 | ||
3df80d93 ACM |
536 | if (dst == NULL) { |
537 | struct in6_addr *final_p = NULL, final; | |
538 | struct flowi fl; | |
539 | ||
540 | memset(&fl, 0, sizeof(fl)); | |
541 | fl.proto = IPPROTO_DCCP; | |
542 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
543 | if (opt != NULL && opt->srcrt != NULL) { |
544 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
545 | ||
3df80d93 ACM |
546 | ipv6_addr_copy(&final, &fl.fl6_dst); |
547 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
548 | final_p = &final; | |
549 | } | |
550 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
551 | fl.oif = sk->sk_bound_dev_if; | |
552 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
553 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
beb8d13b | 554 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
555 | |
556 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
557 | goto out; | |
558 | ||
559 | if (final_p) | |
560 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
561 | ||
562 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
563 | goto out; | |
45329e71 | 564 | } |
3df80d93 ACM |
565 | |
566 | newsk = dccp_create_openreq_child(sk, req, skb); | |
567 | if (newsk == NULL) | |
568 | goto out; | |
569 | ||
570 | /* | |
571 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
572 | * count here, dccp_create_openreq_child now does this for us, see the | |
573 | * comment in that function for the gory details. -acme | |
574 | */ | |
575 | ||
8e1ef0a9 | 576 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
577 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
578 | NETIF_F_TSO); | |
3df80d93 ACM |
579 | newdp6 = (struct dccp6_sock *)newsk; |
580 | newinet = inet_sk(newsk); | |
581 | newinet->pinet6 = &newdp6->inet6; | |
582 | newdp = dccp_sk(newsk); | |
583 | newnp = inet6_sk(newsk); | |
584 | ||
585 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
586 | ||
587 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
588 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
589 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
590 | newsk->sk_bound_dev_if = ireq6->iif; | |
591 | ||
45329e71 | 592 | /* Now IPv6 options... |
3df80d93 ACM |
593 | |
594 | First: no IPv4 options. | |
595 | */ | |
596 | newinet->opt = NULL; | |
597 | ||
598 | /* Clone RX bits */ | |
599 | newnp->rxopt.all = np->rxopt.all; | |
600 | ||
601 | /* Clone pktoptions received with SYN */ | |
602 | newnp->pktoptions = NULL; | |
603 | if (ireq6->pktopts != NULL) { | |
604 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
605 | kfree_skb(ireq6->pktopts); | |
606 | ireq6->pktopts = NULL; | |
607 | if (newnp->pktoptions) | |
608 | skb_set_owner_r(newnp->pktoptions, newsk); | |
609 | } | |
610 | newnp->opt = NULL; | |
611 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 612 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 613 | |
45329e71 ACM |
614 | /* |
615 | * Clone native IPv6 options from listening socket (if any) | |
616 | * | |
617 | * Yes, keeping reference count would be much more clever, but we make | |
618 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 619 | */ |
45329e71 | 620 | if (opt != NULL) { |
3df80d93 ACM |
621 | newnp->opt = ipv6_dup_options(newsk, opt); |
622 | if (opt != np->opt) | |
623 | sock_kfree_s(sk, opt, opt->tot_len); | |
624 | } | |
625 | ||
d83d8461 | 626 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 627 | if (newnp->opt != NULL) |
d83d8461 ACM |
628 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
629 | newnp->opt->opt_flen); | |
3df80d93 ACM |
630 | |
631 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
632 | ||
633 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
634 | ||
ab1e0a13 | 635 | __inet6_hash(newsk); |
e56d8b8a | 636 | __inet_inherit_port(sk, newsk); |
3df80d93 ACM |
637 | |
638 | return newsk; | |
639 | ||
640 | out_overflow: | |
de0744af | 641 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
3df80d93 | 642 | out: |
de0744af | 643 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
45329e71 | 644 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
645 | sock_kfree_s(sk, opt, opt->tot_len); |
646 | dst_release(dst); | |
647 | return NULL; | |
648 | } | |
649 | ||
650 | /* The socket must have it's spinlock held when we get | |
651 | * here. | |
652 | * | |
653 | * We have a potential double-lock case here, so even when | |
654 | * doing backlog processing we use the BH locking scheme. | |
655 | * This is because we cannot sleep with the original spinlock | |
656 | * held. | |
657 | */ | |
658 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
659 | { | |
660 | struct ipv6_pinfo *np = inet6_sk(sk); | |
661 | struct sk_buff *opt_skb = NULL; | |
662 | ||
663 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
664 | goes to IPv4 receive handler and backlogged. | |
665 | From backlog it always goes here. Kerboom... | |
666 | Fortunately, dccp_rcv_established and rcv_established | |
667 | handle them correctly, but it is not case with | |
668 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
669 | */ | |
670 | ||
671 | if (skb->protocol == htons(ETH_P_IP)) | |
672 | return dccp_v4_do_rcv(sk, skb); | |
673 | ||
fda9ef5d | 674 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
675 | goto discard; |
676 | ||
677 | /* | |
45329e71 ACM |
678 | * socket locking is here for SMP purposes as backlog rcv is currently |
679 | * called with bh processing disabled. | |
3df80d93 ACM |
680 | */ |
681 | ||
682 | /* Do Stevens' IPV6_PKTOPTIONS. | |
683 | ||
684 | Yes, guys, it is the only place in our code, where we | |
685 | may make it not affecting IPv4. | |
686 | The rest of code is protocol independent, | |
687 | and I do not like idea to uglify IPv4. | |
688 | ||
689 | Actually, all the idea behind IPV6_PKTOPTIONS | |
690 | looks not very well thought. For now we latch | |
691 | options, received in the last packet, enqueued | |
692 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 693 | --ANK (980728) |
3df80d93 ACM |
694 | */ |
695 | if (np->rxopt.all) | |
89e7e577 GR |
696 | /* |
697 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
698 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
699 | */ | |
3df80d93 ACM |
700 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
701 | ||
702 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
703 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
704 | goto reset; | |
fd169f15 | 705 | if (opt_skb) { |
89e7e577 | 706 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
707 | __kfree_skb(opt_skb); |
708 | } | |
3df80d93 ACM |
709 | return 0; |
710 | } | |
711 | ||
d83ca5ac GR |
712 | /* |
713 | * Step 3: Process LISTEN state | |
714 | * If S.state == LISTEN, | |
715 | * If P.type == Request or P contains a valid Init Cookie option, | |
716 | * (* Must scan the packet's options to check for Init | |
717 | * Cookies. Only Init Cookies are processed here, | |
718 | * however; other options are processed in Step 8. This | |
719 | * scan need only be performed if the endpoint uses Init | |
720 | * Cookies *) | |
721 | * (* Generate a new socket and switch to that socket *) | |
722 | * Set S := new socket for this port pair | |
723 | * S.state = RESPOND | |
724 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
725 | * Initialize S.GAR := S.ISS | |
726 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
727 | * Continue with S.state == RESPOND | |
728 | * (* A Response packet will be generated in Step 11 *) | |
729 | * Otherwise, | |
730 | * Generate Reset(No Connection) unless P.type == Reset | |
731 | * Drop packet and return | |
732 | * | |
733 | * NOTE: the check for the packet types is done in | |
734 | * dccp_rcv_state_process | |
735 | */ | |
45329e71 | 736 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 737 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 738 | |
45329e71 ACM |
739 | if (nsk == NULL) |
740 | goto discard; | |
3df80d93 ACM |
741 | /* |
742 | * Queue it on the new socket if the new socket is active, | |
743 | * otherwise we just shortcircuit this and continue with | |
744 | * the new socket.. | |
745 | */ | |
8109b02b | 746 | if (nsk != sk) { |
3df80d93 ACM |
747 | if (dccp_child_process(sk, nsk, skb)) |
748 | goto reset; | |
45329e71 | 749 | if (opt_skb != NULL) |
3df80d93 ACM |
750 | __kfree_skb(opt_skb); |
751 | return 0; | |
752 | } | |
753 | } | |
754 | ||
755 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
756 | goto reset; | |
fd169f15 | 757 | if (opt_skb) { |
89e7e577 | 758 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
759 | __kfree_skb(opt_skb); |
760 | } | |
3df80d93 ACM |
761 | return 0; |
762 | ||
763 | reset: | |
cfb6eeb4 | 764 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 765 | discard: |
45329e71 | 766 | if (opt_skb != NULL) |
3df80d93 ACM |
767 | __kfree_skb(opt_skb); |
768 | kfree_skb(skb); | |
769 | return 0; | |
770 | } | |
771 | ||
e5bbef20 | 772 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
773 | { |
774 | const struct dccp_hdr *dh; | |
3df80d93 | 775 | struct sock *sk; |
6f4e5fff | 776 | int min_cov; |
3df80d93 | 777 | |
6f4e5fff | 778 | /* Step 1: Check header basics */ |
3df80d93 ACM |
779 | |
780 | if (dccp_invalid_packet(skb)) | |
781 | goto discard_it; | |
782 | ||
6f4e5fff | 783 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
784 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
785 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 786 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
787 | goto discard_it; |
788 | } | |
789 | ||
3df80d93 ACM |
790 | dh = dccp_hdr(skb); |
791 | ||
fde20105 | 792 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
793 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
794 | ||
795 | if (dccp_packet_without_ack(skb)) | |
796 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
797 | else | |
798 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
799 | ||
800 | /* Step 2: | |
8109b02b | 801 | * Look up flow ID in table and get corresponding socket */ |
671a1c74 PE |
802 | sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo, |
803 | &ipv6_hdr(skb)->saddr, dh->dccph_sport, | |
0660e03f | 804 | &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport), |
3df80d93 | 805 | inet6_iif(skb)); |
45329e71 | 806 | /* |
3df80d93 | 807 | * Step 2: |
8109b02b | 808 | * If no socket ... |
3df80d93 | 809 | */ |
d23c7107 GR |
810 | if (sk == NULL) { |
811 | dccp_pr_debug("failed to look up flow ID in table and " | |
812 | "get corresponding socket\n"); | |
3df80d93 | 813 | goto no_dccp_socket; |
d23c7107 | 814 | } |
3df80d93 | 815 | |
45329e71 | 816 | /* |
3df80d93 | 817 | * Step 2: |
8109b02b | 818 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
819 | * Generate Reset(No Connection) unless P.type == Reset |
820 | * Drop packet and return | |
821 | */ | |
d23c7107 GR |
822 | if (sk->sk_state == DCCP_TIME_WAIT) { |
823 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
824 | inet_twsk_put(inet_twsk(sk)); | |
825 | goto no_dccp_socket; | |
826 | } | |
3df80d93 | 827 | |
6f4e5fff GR |
828 | /* |
829 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
830 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
831 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
832 | */ |
833 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
834 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
835 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
836 | dh->dccph_cscov, min_cov); | |
837 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
838 | goto discard_and_relse; | |
839 | } | |
840 | ||
3df80d93 ACM |
841 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
842 | goto discard_and_relse; | |
843 | ||
58a5a7b9 | 844 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
845 | |
846 | no_dccp_socket: | |
847 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
848 | goto discard_it; | |
849 | /* | |
850 | * Step 2: | |
8109b02b | 851 | * If no socket ... |
3df80d93 ACM |
852 | * Generate Reset(No Connection) unless P.type == Reset |
853 | * Drop packet and return | |
854 | */ | |
855 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
856 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
857 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 858 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 859 | } |
3df80d93 | 860 | |
d23c7107 | 861 | discard_it: |
3df80d93 ACM |
862 | kfree_skb(skb); |
863 | return 0; | |
864 | ||
865 | discard_and_relse: | |
866 | sock_put(sk); | |
867 | goto discard_it; | |
3df80d93 ACM |
868 | } |
869 | ||
73c9e02c GR |
870 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
871 | int addr_len) | |
872 | { | |
873 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
874 | struct inet_connection_sock *icsk = inet_csk(sk); | |
875 | struct inet_sock *inet = inet_sk(sk); | |
876 | struct ipv6_pinfo *np = inet6_sk(sk); | |
877 | struct dccp_sock *dp = dccp_sk(sk); | |
878 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
879 | struct flowi fl; | |
880 | struct dst_entry *dst; | |
881 | int addr_type; | |
882 | int err; | |
883 | ||
884 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
885 | ||
886 | if (addr_len < SIN6_LEN_RFC2133) | |
887 | return -EINVAL; | |
888 | ||
889 | if (usin->sin6_family != AF_INET6) | |
890 | return -EAFNOSUPPORT; | |
891 | ||
892 | memset(&fl, 0, sizeof(fl)); | |
893 | ||
894 | if (np->sndflow) { | |
895 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
896 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
897 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
898 | struct ip6_flowlabel *flowlabel; | |
899 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
900 | if (flowlabel == NULL) | |
901 | return -EINVAL; | |
902 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
903 | fl6_sock_release(flowlabel); | |
904 | } | |
905 | } | |
906 | /* | |
907 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
908 | */ | |
909 | if (ipv6_addr_any(&usin->sin6_addr)) | |
910 | usin->sin6_addr.s6_addr[15] = 1; | |
911 | ||
912 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
913 | ||
914 | if (addr_type & IPV6_ADDR_MULTICAST) | |
915 | return -ENETUNREACH; | |
916 | ||
917 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
918 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
919 | usin->sin6_scope_id) { | |
920 | /* If interface is set while binding, indices | |
921 | * must coincide. | |
922 | */ | |
923 | if (sk->sk_bound_dev_if && | |
924 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
925 | return -EINVAL; | |
926 | ||
927 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
928 | } | |
929 | ||
930 | /* Connect to link-local address requires an interface */ | |
931 | if (!sk->sk_bound_dev_if) | |
932 | return -EINVAL; | |
933 | } | |
934 | ||
935 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
936 | np->flow_label = fl.fl6_flowlabel; | |
937 | ||
938 | /* | |
939 | * DCCP over IPv4 | |
940 | */ | |
941 | if (addr_type == IPV6_ADDR_MAPPED) { | |
942 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
943 | struct sockaddr_in sin; | |
944 | ||
945 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
946 | ||
947 | if (__ipv6_only_sock(sk)) | |
948 | return -ENETUNREACH; | |
949 | ||
950 | sin.sin_family = AF_INET; | |
951 | sin.sin_port = usin->sin6_port; | |
952 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
953 | ||
954 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
955 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
956 | ||
957 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
958 | if (err) { | |
959 | icsk->icsk_ext_hdr_len = exthdrlen; | |
960 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
961 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
962 | goto failure; | |
963 | } else { | |
964 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
965 | inet->saddr); | |
966 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
967 | inet->rcv_saddr); | |
968 | } | |
969 | ||
970 | return err; | |
971 | } | |
972 | ||
973 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
974 | saddr = &np->rcv_saddr; | |
975 | ||
976 | fl.proto = IPPROTO_DCCP; | |
977 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
978 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
979 | fl.oif = sk->sk_bound_dev_if; | |
980 | fl.fl_ip_dport = usin->sin6_port; | |
981 | fl.fl_ip_sport = inet->sport; | |
982 | security_sk_classify_flow(sk, &fl); | |
983 | ||
984 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
985 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
986 | ||
987 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
988 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
989 | final_p = &final; | |
990 | } | |
991 | ||
992 | err = ip6_dst_lookup(sk, &dst, &fl); | |
993 | if (err) | |
994 | goto failure; | |
995 | ||
996 | if (final_p) | |
997 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
998 | ||
bb72845e | 999 | err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT); |
14e50e57 DM |
1000 | if (err < 0) { |
1001 | if (err == -EREMOTE) | |
1002 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
1003 | if (err < 0) | |
1004 | goto failure; | |
1005 | } | |
73c9e02c GR |
1006 | |
1007 | if (saddr == NULL) { | |
1008 | saddr = &fl.fl6_src; | |
1009 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1010 | } | |
1011 | ||
1012 | /* set the source address */ | |
1013 | ipv6_addr_copy(&np->saddr, saddr); | |
1014 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1015 | ||
1016 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1017 | ||
1018 | icsk->icsk_ext_hdr_len = 0; | |
1019 | if (np->opt != NULL) | |
1020 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1021 | np->opt->opt_nflen); | |
1022 | ||
1023 | inet->dport = usin->sin6_port; | |
1024 | ||
1025 | dccp_set_state(sk, DCCP_REQUESTING); | |
1026 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1027 | if (err) | |
1028 | goto late_failure; | |
d7f7365f GR |
1029 | |
1030 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1031 | np->daddr.s6_addr32, | |
1032 | inet->sport, inet->dport); | |
73c9e02c GR |
1033 | err = dccp_connect(sk); |
1034 | if (err) | |
1035 | goto late_failure; | |
1036 | ||
1037 | return 0; | |
1038 | ||
1039 | late_failure: | |
1040 | dccp_set_state(sk, DCCP_CLOSED); | |
1041 | __sk_dst_reset(sk); | |
1042 | failure: | |
1043 | inet->dport = 0; | |
1044 | sk->sk_route_caps = 0; | |
1045 | return err; | |
1046 | } | |
1047 | ||
3df80d93 | 1048 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1049 | .queue_xmit = inet6_csk_xmit, |
1050 | .send_check = dccp_v6_send_check, | |
1051 | .rebuild_header = inet6_sk_rebuild_header, | |
1052 | .conn_request = dccp_v6_conn_request, | |
1053 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1054 | .net_header_len = sizeof(struct ipv6hdr), | |
1055 | .setsockopt = ipv6_setsockopt, | |
1056 | .getsockopt = ipv6_getsockopt, | |
1057 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1058 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1059 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1060 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1061 | .compat_setsockopt = compat_ipv6_setsockopt, |
1062 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1063 | #endif |
3df80d93 ACM |
1064 | }; |
1065 | ||
1066 | /* | |
1067 | * DCCP over IPv4 via INET6 API | |
1068 | */ | |
1069 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1070 | .queue_xmit = ip_queue_xmit, |
1071 | .send_check = dccp_v4_send_check, | |
1072 | .rebuild_header = inet_sk_rebuild_header, | |
1073 | .conn_request = dccp_v6_conn_request, | |
1074 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1075 | .net_header_len = sizeof(struct iphdr), | |
1076 | .setsockopt = ipv6_setsockopt, | |
1077 | .getsockopt = ipv6_getsockopt, | |
1078 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1079 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1080 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1081 | .compat_setsockopt = compat_ipv6_setsockopt, |
1082 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1083 | #endif |
3df80d93 ACM |
1084 | }; |
1085 | ||
1086 | /* NOTE: A lot of things set to zero explicitly by call to | |
1087 | * sk_alloc() so need not be done here. | |
1088 | */ | |
1089 | static int dccp_v6_init_sock(struct sock *sk) | |
1090 | { | |
72478873 ACM |
1091 | static __u8 dccp_v6_ctl_sock_initialized; |
1092 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1093 | |
72478873 ACM |
1094 | if (err == 0) { |
1095 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1096 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1097 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1098 | } |
3df80d93 ACM |
1099 | |
1100 | return err; | |
1101 | } | |
1102 | ||
7d06b2e0 | 1103 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1104 | { |
3e0fadc5 | 1105 | dccp_destroy_sock(sk); |
7d06b2e0 | 1106 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1107 | } |
1108 | ||
73c9e02c GR |
1109 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1110 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1111 | }; | |
1112 | ||
3df80d93 | 1113 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1114 | .name = "DCCPv6", |
1115 | .owner = THIS_MODULE, | |
1116 | .close = dccp_close, | |
1117 | .connect = dccp_v6_connect, | |
1118 | .disconnect = dccp_disconnect, | |
1119 | .ioctl = dccp_ioctl, | |
1120 | .init = dccp_v6_init_sock, | |
1121 | .setsockopt = dccp_setsockopt, | |
1122 | .getsockopt = dccp_getsockopt, | |
1123 | .sendmsg = dccp_sendmsg, | |
1124 | .recvmsg = dccp_recvmsg, | |
1125 | .backlog_rcv = dccp_v6_do_rcv, | |
1126 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1127 | .unhash = inet_unhash, |
543d9cfe | 1128 | .accept = inet_csk_accept, |
ab1e0a13 | 1129 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1130 | .shutdown = dccp_shutdown, |
1131 | .destroy = dccp_v6_destroy_sock, | |
1132 | .orphan_count = &dccp_orphan_count, | |
1133 | .max_header = MAX_DCCP_HEADER, | |
1134 | .obj_size = sizeof(struct dccp6_sock), | |
1135 | .rsk_prot = &dccp6_request_sock_ops, | |
1136 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1137 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1138 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1139 | .compat_setsockopt = compat_dccp_setsockopt, |
1140 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1141 | #endif |
3df80d93 ACM |
1142 | }; |
1143 | ||
1144 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1145 | .handler = dccp_v6_rcv, |
1146 | .err_handler = dccp_v6_err, | |
1147 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1148 | }; |
1149 | ||
1150 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1151 | .family = PF_INET6, |
1152 | .owner = THIS_MODULE, | |
1153 | .release = inet6_release, | |
1154 | .bind = inet6_bind, | |
1155 | .connect = inet_stream_connect, | |
1156 | .socketpair = sock_no_socketpair, | |
1157 | .accept = inet_accept, | |
1158 | .getname = inet6_getname, | |
1159 | .poll = dccp_poll, | |
1160 | .ioctl = inet6_ioctl, | |
1161 | .listen = inet_dccp_listen, | |
1162 | .shutdown = inet_shutdown, | |
1163 | .setsockopt = sock_common_setsockopt, | |
1164 | .getsockopt = sock_common_getsockopt, | |
1165 | .sendmsg = inet_sendmsg, | |
1166 | .recvmsg = sock_common_recvmsg, | |
1167 | .mmap = sock_no_mmap, | |
1168 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1169 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1170 | .compat_setsockopt = compat_sock_common_setsockopt, |
1171 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1172 | #endif |
3df80d93 ACM |
1173 | }; |
1174 | ||
1175 | static struct inet_protosw dccp_v6_protosw = { | |
1176 | .type = SOCK_DCCP, | |
1177 | .protocol = IPPROTO_DCCP, | |
1178 | .prot = &dccp_v6_prot, | |
1179 | .ops = &inet6_dccp_ops, | |
1180 | .capability = -1, | |
d83d8461 | 1181 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1182 | }; |
1183 | ||
8231bd27 PE |
1184 | static int dccp_v6_init_net(struct net *net) |
1185 | { | |
334527d3 PE |
1186 | int err; |
1187 | ||
1188 | err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, | |
1189 | SOCK_DCCP, IPPROTO_DCCP, net); | |
1190 | return err; | |
8231bd27 PE |
1191 | } |
1192 | ||
1193 | static void dccp_v6_exit_net(struct net *net) | |
1194 | { | |
334527d3 | 1195 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1196 | } |
1197 | ||
1198 | static struct pernet_operations dccp_v6_ops = { | |
1199 | .init = dccp_v6_init_net, | |
1200 | .exit = dccp_v6_exit_net, | |
1201 | }; | |
1202 | ||
3df80d93 ACM |
1203 | static int __init dccp_v6_init(void) |
1204 | { | |
1205 | int err = proto_register(&dccp_v6_prot, 1); | |
1206 | ||
1207 | if (err != 0) | |
1208 | goto out; | |
1209 | ||
1210 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1211 | if (err != 0) | |
1212 | goto out_unregister_proto; | |
1213 | ||
1214 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1215 | |
8231bd27 PE |
1216 | err = register_pernet_subsys(&dccp_v6_ops); |
1217 | if (err != 0) | |
1218 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1219 | out: |
1220 | return err; | |
8231bd27 PE |
1221 | |
1222 | out_destroy_ctl_sock: | |
72478873 ACM |
1223 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1224 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1225 | out_unregister_proto: |
1226 | proto_unregister(&dccp_v6_prot); | |
1227 | goto out; | |
1228 | } | |
1229 | ||
1230 | static void __exit dccp_v6_exit(void) | |
1231 | { | |
8231bd27 | 1232 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1233 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1234 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1235 | proto_unregister(&dccp_v6_prot); | |
1236 | } | |
1237 | ||
1238 | module_init(dccp_v6_init); | |
1239 | module_exit(dccp_v6_exit); | |
1240 | ||
1241 | /* | |
1242 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1243 | * values directly, Also cover the case where the protocol is not specified, | |
1244 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1245 | */ | |
7131c6c7 JD |
1246 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1247 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1248 | MODULE_LICENSE("GPL"); |
1249 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1250 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |