Commit | Line | Data |
---|---|---|
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 | |
02047741 | 36 | /* 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); | |
92 | struct ipv6_pinfo *np; | |
93 | struct sock *sk; | |
94 | int err; | |
95 | __u64 seq; | |
96 | ||
d86e0dac PE |
97 | sk = inet6_lookup(&init_net, &dccp_hashinfo, &hdr->daddr, dh->dccph_dport, |
98 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); | |
3df80d93 ACM |
99 | |
100 | if (sk == NULL) { | |
101 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
102 | return; | |
103 | } | |
104 | ||
105 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 106 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
107 | return; |
108 | } | |
109 | ||
110 | bh_lock_sock(sk); | |
111 | if (sock_owned_by_user(sk)) | |
112 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
113 | ||
114 | if (sk->sk_state == DCCP_CLOSED) | |
115 | goto out; | |
116 | ||
117 | np = inet6_sk(sk); | |
118 | ||
119 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
120 | struct dst_entry *dst = NULL; |
121 | ||
122 | if (sock_owned_by_user(sk)) | |
123 | goto out; | |
124 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
125 | goto out; | |
126 | ||
127 | /* icmp should have updated the destination cache entry */ | |
128 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
129 | if (dst == NULL) { |
130 | struct inet_sock *inet = inet_sk(sk); | |
131 | struct flowi fl; | |
132 | ||
133 | /* BUGGG_FUTURE: Again, it is not clear how | |
134 | to handle rthdr case. Ignore this complexity | |
135 | for now. | |
136 | */ | |
137 | memset(&fl, 0, sizeof(fl)); | |
138 | fl.proto = IPPROTO_DCCP; | |
139 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
140 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
141 | fl.oif = sk->sk_bound_dev_if; | |
142 | fl.fl_ip_dport = inet->dport; | |
143 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 144 | security_sk_classify_flow(sk, &fl); |
3df80d93 | 145 | |
45329e71 ACM |
146 | err = ip6_dst_lookup(sk, &dst, &fl); |
147 | if (err) { | |
3df80d93 ACM |
148 | sk->sk_err_soft = -err; |
149 | goto out; | |
150 | } | |
151 | ||
45329e71 ACM |
152 | err = xfrm_lookup(&dst, &fl, sk, 0); |
153 | if (err < 0) { | |
3df80d93 ACM |
154 | sk->sk_err_soft = -err; |
155 | goto out; | |
156 | } | |
3df80d93 ACM |
157 | } else |
158 | dst_hold(dst); | |
159 | ||
d83d8461 | 160 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
161 | dccp_sync_mss(sk, dst_mtu(dst)); |
162 | } /* else let the usual retransmit timer handle it */ | |
163 | dst_release(dst); | |
164 | goto out; | |
165 | } | |
166 | ||
167 | icmpv6_err_convert(type, code, &err); | |
168 | ||
fde20105 | 169 | seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
170 | /* Might be for an request_sock */ |
171 | switch (sk->sk_state) { | |
172 | struct request_sock *req, **prev; | |
173 | case DCCP_LISTEN: | |
174 | if (sock_owned_by_user(sk)) | |
175 | goto out; | |
176 | ||
177 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
178 | &hdr->daddr, &hdr->saddr, | |
179 | inet6_iif(skb)); | |
45329e71 | 180 | if (req == NULL) |
3df80d93 ACM |
181 | goto out; |
182 | ||
45329e71 ACM |
183 | /* |
184 | * ICMPs are not backlogged, hence we cannot get an established | |
185 | * socket here. | |
3df80d93 ACM |
186 | */ |
187 | BUG_TRAP(req->sk == NULL); | |
188 | ||
189 | if (seq != dccp_rsk(req)->dreq_iss) { | |
190 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
191 | goto out; | |
192 | } | |
193 | ||
194 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
195 | goto out; | |
196 | ||
197 | case DCCP_REQUESTING: | |
198 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 199 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
200 | if (!sock_owned_by_user(sk)) { |
201 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
202 | sk->sk_err = err; | |
203 | /* | |
204 | * Wake people up to see the error | |
205 | * (see connect in sock.c) | |
206 | */ | |
207 | sk->sk_error_report(sk); | |
3df80d93 ACM |
208 | dccp_done(sk); |
209 | } else | |
210 | sk->sk_err_soft = err; | |
211 | goto out; | |
212 | } | |
213 | ||
214 | if (!sock_owned_by_user(sk) && np->recverr) { | |
215 | sk->sk_err = err; | |
216 | sk->sk_error_report(sk); | |
217 | } else | |
218 | sk->sk_err_soft = err; | |
219 | ||
220 | out: | |
221 | bh_unlock_sock(sk); | |
222 | sock_put(sk); | |
223 | } | |
224 | ||
225 | ||
fd80eb94 | 226 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 ACM |
227 | { |
228 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
229 | struct ipv6_pinfo *np = inet6_sk(sk); | |
230 | struct sk_buff *skb; | |
231 | struct ipv6_txoptions *opt = NULL; | |
232 | struct in6_addr *final_p = NULL, final; | |
233 | struct flowi fl; | |
234 | int err = -1; | |
fd80eb94 | 235 | struct dst_entry *dst; |
3df80d93 ACM |
236 | |
237 | memset(&fl, 0, sizeof(fl)); | |
238 | fl.proto = IPPROTO_DCCP; | |
239 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
240 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
241 | fl.fl6_flowlabel = 0; | |
242 | fl.oif = ireq6->iif; | |
243 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
244 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
4237c75c | 245 | security_req_classify_flow(req, &fl); |
3df80d93 | 246 | |
fd80eb94 | 247 | opt = np->opt; |
3df80d93 | 248 | |
fd80eb94 DL |
249 | if (opt != NULL && opt->srcrt != NULL) { |
250 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
45329e71 | 251 | |
fd80eb94 DL |
252 | ipv6_addr_copy(&final, &fl.fl6_dst); |
253 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
254 | final_p = &final; | |
255 | } | |
3df80d93 | 256 | |
fd80eb94 DL |
257 | err = ip6_dst_lookup(sk, &dst, &fl); |
258 | if (err) | |
259 | goto done; | |
45329e71 | 260 | |
fd80eb94 DL |
261 | if (final_p) |
262 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 | 263 | |
fd80eb94 DL |
264 | err = xfrm_lookup(&dst, &fl, sk, 0); |
265 | if (err < 0) | |
266 | goto done; | |
3df80d93 ACM |
267 | |
268 | skb = dccp_make_response(sk, dst, req); | |
269 | if (skb != NULL) { | |
270 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 271 | |
6f4e5fff GR |
272 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
273 | &ireq6->loc_addr, | |
274 | &ireq6->rmt_addr); | |
3df80d93 ACM |
275 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
276 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
b9df3cb8 | 277 | err = net_xmit_eval(err); |
3df80d93 ACM |
278 | } |
279 | ||
280 | done: | |
45329e71 | 281 | if (opt != NULL && opt != np->opt) |
3df80d93 | 282 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 283 | dst_release(dst); |
3df80d93 ACM |
284 | return err; |
285 | } | |
286 | ||
287 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
288 | { | |
289 | if (inet6_rsk(req)->pktopts != NULL) | |
290 | kfree_skb(inet6_rsk(req)->pktopts); | |
291 | } | |
292 | ||
cfb6eeb4 | 293 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 294 | { |
0660e03f | 295 | struct ipv6hdr *rxip6h; |
3df80d93 ACM |
296 | struct sk_buff *skb; |
297 | struct flowi fl; | |
02047741 | 298 | struct sock *ctl_sk = init_net.dccp.v6_ctl_sk; |
3df80d93 | 299 | |
e356d37a | 300 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
301 | return; |
302 | ||
303 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 304 | return; |
3df80d93 | 305 | |
02047741 | 306 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 307 | if (skb == NULL) |
8109b02b | 308 | return; |
3df80d93 | 309 | |
0660e03f | 310 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
311 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
312 | &rxip6h->daddr); | |
6f4e5fff | 313 | |
3df80d93 | 314 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
315 | ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); |
316 | ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); | |
6f4e5fff | 317 | |
3df80d93 ACM |
318 | fl.proto = IPPROTO_DCCP; |
319 | fl.oif = inet6_iif(rxskb); | |
e356d37a GR |
320 | fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; |
321 | fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; | |
beb8d13b | 322 | security_skb_classify_flow(rxskb, &fl); |
3df80d93 ACM |
323 | |
324 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
02047741 | 325 | if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) { |
3df80d93 | 326 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { |
02047741 | 327 | ip6_xmit(ctl_sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
328 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
329 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
330 | return; | |
331 | } | |
332 | } | |
333 | ||
334 | kfree_skb(skb); | |
335 | } | |
336 | ||
73c9e02c GR |
337 | static struct request_sock_ops dccp6_request_sock_ops = { |
338 | .family = AF_INET6, | |
339 | .obj_size = sizeof(struct dccp6_request_sock), | |
340 | .rtx_syn_ack = dccp_v6_send_response, | |
341 | .send_ack = dccp_reqsk_send_ack, | |
342 | .destructor = dccp_v6_reqsk_destructor, | |
343 | .send_reset = dccp_v6_ctl_send_reset, | |
344 | }; | |
345 | ||
3df80d93 ACM |
346 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
347 | { | |
348 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 349 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
350 | struct sock *nsk; |
351 | struct request_sock **prev; | |
352 | /* Find possible connection requests. */ | |
353 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
354 | dh->dccph_sport, | |
355 | &iph->saddr, | |
356 | &iph->daddr, | |
357 | inet6_iif(skb)); | |
358 | if (req != NULL) | |
359 | return dccp_check_req(sk, skb, req, prev); | |
360 | ||
d86e0dac | 361 | nsk = __inet6_lookup_established(&init_net, &dccp_hashinfo, |
3df80d93 ACM |
362 | &iph->saddr, dh->dccph_sport, |
363 | &iph->daddr, ntohs(dh->dccph_dport), | |
364 | inet6_iif(skb)); | |
3df80d93 ACM |
365 | if (nsk != NULL) { |
366 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
367 | bh_lock_sock(nsk); | |
368 | return nsk; | |
369 | } | |
9469c7b4 | 370 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
371 | return NULL; |
372 | } | |
373 | ||
374 | return sk; | |
375 | } | |
376 | ||
377 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
378 | { | |
3df80d93 ACM |
379 | struct request_sock *req; |
380 | struct dccp_request_sock *dreq; | |
381 | struct inet6_request_sock *ireq6; | |
382 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 383 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 384 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
385 | |
386 | if (skb->protocol == htons(ETH_P_IP)) | |
387 | return dccp_v4_conn_request(sk, skb); | |
388 | ||
389 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 390 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
391 | |
392 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 393 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 394 | goto drop; |
8109b02b | 395 | } |
3df80d93 | 396 | /* |
45329e71 | 397 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 398 | */ |
4a5409a5 | 399 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 400 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 401 | goto drop; |
3df80d93 ACM |
402 | |
403 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
404 | goto drop; | |
405 | ||
82709531 | 406 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
407 | if (req == NULL) |
408 | goto drop; | |
409 | ||
cf557926 | 410 | dccp_reqsk_init(req, skb); |
3df80d93 | 411 | |
8b819412 GR |
412 | dreq = dccp_rsk(req); |
413 | if (dccp_parse_options(sk, dreq, skb)) | |
414 | goto drop_and_free; | |
415 | ||
4237c75c VY |
416 | if (security_inet_conn_request(sk, skb, req)) |
417 | goto drop_and_free; | |
418 | ||
3df80d93 | 419 | ireq6 = inet6_rsk(req); |
0660e03f ACM |
420 | ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); |
421 | ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); | |
3df80d93 ACM |
422 | ireq6->pktopts = NULL; |
423 | ||
424 | if (ipv6_opt_accepted(sk, skb) || | |
425 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
426 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
427 | atomic_inc(&skb->users); | |
428 | ireq6->pktopts = skb; | |
429 | } | |
430 | ireq6->iif = sk->sk_bound_dev_if; | |
431 | ||
432 | /* So that link locals have meaning */ | |
433 | if (!sk->sk_bound_dev_if && | |
434 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
435 | ireq6->iif = inet6_iif(skb); | |
436 | ||
45329e71 | 437 | /* |
3df80d93 ACM |
438 | * Step 3: Process LISTEN state |
439 | * | |
d83ca5ac | 440 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 441 | * |
d83ca5ac GR |
442 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
443 | * dccp_create_openreq_child. | |
3df80d93 | 444 | */ |
3df80d93 | 445 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 446 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
447 | dreq->dreq_service = service; |
448 | ||
fd80eb94 | 449 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
450 | goto drop_and_free; |
451 | ||
452 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
453 | return 0; | |
454 | ||
455 | drop_and_free: | |
456 | reqsk_free(req); | |
457 | drop: | |
458 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
459 | return -1; |
460 | } | |
461 | ||
462 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
463 | struct sk_buff *skb, | |
464 | struct request_sock *req, | |
465 | struct dst_entry *dst) | |
466 | { | |
467 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
468 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
469 | struct inet_sock *newinet; | |
470 | struct dccp_sock *newdp; | |
471 | struct dccp6_sock *newdp6; | |
472 | struct sock *newsk; | |
473 | struct ipv6_txoptions *opt; | |
474 | ||
475 | if (skb->protocol == htons(ETH_P_IP)) { | |
476 | /* | |
477 | * v6 mapped | |
478 | */ | |
3df80d93 | 479 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 480 | if (newsk == NULL) |
3df80d93 ACM |
481 | return NULL; |
482 | ||
483 | newdp6 = (struct dccp6_sock *)newsk; | |
484 | newdp = dccp_sk(newsk); | |
485 | newinet = inet_sk(newsk); | |
486 | newinet->pinet6 = &newdp6->inet6; | |
487 | newnp = inet6_sk(newsk); | |
488 | ||
489 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
490 | ||
491 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
492 | newinet->daddr); | |
493 | ||
494 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
495 | newinet->saddr); | |
496 | ||
497 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
498 | ||
499 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
500 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
501 | newnp->pktoptions = NULL; | |
502 | newnp->opt = NULL; | |
503 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 504 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
505 | |
506 | /* | |
507 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
508 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
509 | * that function for the gory details. -acme | |
510 | */ | |
511 | ||
512 | /* It is tricky place. Until this moment IPv4 tcp | |
513 | worked with IPv6 icsk.icsk_af_ops. | |
514 | Sync it now. | |
515 | */ | |
d83d8461 | 516 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
517 | |
518 | return newsk; | |
519 | } | |
520 | ||
521 | opt = np->opt; | |
522 | ||
523 | if (sk_acceptq_is_full(sk)) | |
524 | goto out_overflow; | |
525 | ||
3df80d93 ACM |
526 | if (dst == NULL) { |
527 | struct in6_addr *final_p = NULL, final; | |
528 | struct flowi fl; | |
529 | ||
530 | memset(&fl, 0, sizeof(fl)); | |
531 | fl.proto = IPPROTO_DCCP; | |
532 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
533 | if (opt != NULL && opt->srcrt != NULL) { |
534 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
535 | ||
3df80d93 ACM |
536 | ipv6_addr_copy(&final, &fl.fl6_dst); |
537 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
538 | final_p = &final; | |
539 | } | |
540 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
541 | fl.oif = sk->sk_bound_dev_if; | |
542 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
543 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
beb8d13b | 544 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
545 | |
546 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
547 | goto out; | |
548 | ||
549 | if (final_p) | |
550 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
551 | ||
552 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
553 | goto out; | |
45329e71 | 554 | } |
3df80d93 ACM |
555 | |
556 | newsk = dccp_create_openreq_child(sk, req, skb); | |
557 | if (newsk == NULL) | |
558 | goto out; | |
559 | ||
560 | /* | |
561 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
562 | * count here, dccp_create_openreq_child now does this for us, see the | |
563 | * comment in that function for the gory details. -acme | |
564 | */ | |
565 | ||
8e1ef0a9 | 566 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
567 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
568 | NETIF_F_TSO); | |
3df80d93 ACM |
569 | newdp6 = (struct dccp6_sock *)newsk; |
570 | newinet = inet_sk(newsk); | |
571 | newinet->pinet6 = &newdp6->inet6; | |
572 | newdp = dccp_sk(newsk); | |
573 | newnp = inet6_sk(newsk); | |
574 | ||
575 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
576 | ||
577 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
578 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
579 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
580 | newsk->sk_bound_dev_if = ireq6->iif; | |
581 | ||
45329e71 | 582 | /* Now IPv6 options... |
3df80d93 ACM |
583 | |
584 | First: no IPv4 options. | |
585 | */ | |
586 | newinet->opt = NULL; | |
587 | ||
588 | /* Clone RX bits */ | |
589 | newnp->rxopt.all = np->rxopt.all; | |
590 | ||
591 | /* Clone pktoptions received with SYN */ | |
592 | newnp->pktoptions = NULL; | |
593 | if (ireq6->pktopts != NULL) { | |
594 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
595 | kfree_skb(ireq6->pktopts); | |
596 | ireq6->pktopts = NULL; | |
597 | if (newnp->pktoptions) | |
598 | skb_set_owner_r(newnp->pktoptions, newsk); | |
599 | } | |
600 | newnp->opt = NULL; | |
601 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 602 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 603 | |
45329e71 ACM |
604 | /* |
605 | * Clone native IPv6 options from listening socket (if any) | |
606 | * | |
607 | * Yes, keeping reference count would be much more clever, but we make | |
608 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 609 | */ |
45329e71 | 610 | if (opt != NULL) { |
3df80d93 ACM |
611 | newnp->opt = ipv6_dup_options(newsk, opt); |
612 | if (opt != np->opt) | |
613 | sock_kfree_s(sk, opt, opt->tot_len); | |
614 | } | |
615 | ||
d83d8461 | 616 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 617 | if (newnp->opt != NULL) |
d83d8461 ACM |
618 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
619 | newnp->opt->opt_flen); | |
3df80d93 ACM |
620 | |
621 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
622 | ||
623 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
624 | ||
ab1e0a13 ACM |
625 | __inet6_hash(newsk); |
626 | inet_inherit_port(sk, newsk); | |
3df80d93 ACM |
627 | |
628 | return newsk; | |
629 | ||
630 | out_overflow: | |
631 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
632 | out: | |
633 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
45329e71 | 634 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
635 | sock_kfree_s(sk, opt, opt->tot_len); |
636 | dst_release(dst); | |
637 | return NULL; | |
638 | } | |
639 | ||
640 | /* The socket must have it's spinlock held when we get | |
641 | * here. | |
642 | * | |
643 | * We have a potential double-lock case here, so even when | |
644 | * doing backlog processing we use the BH locking scheme. | |
645 | * This is because we cannot sleep with the original spinlock | |
646 | * held. | |
647 | */ | |
648 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
649 | { | |
650 | struct ipv6_pinfo *np = inet6_sk(sk); | |
651 | struct sk_buff *opt_skb = NULL; | |
652 | ||
653 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
654 | goes to IPv4 receive handler and backlogged. | |
655 | From backlog it always goes here. Kerboom... | |
656 | Fortunately, dccp_rcv_established and rcv_established | |
657 | handle them correctly, but it is not case with | |
658 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
659 | */ | |
660 | ||
661 | if (skb->protocol == htons(ETH_P_IP)) | |
662 | return dccp_v4_do_rcv(sk, skb); | |
663 | ||
fda9ef5d | 664 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
665 | goto discard; |
666 | ||
667 | /* | |
45329e71 ACM |
668 | * socket locking is here for SMP purposes as backlog rcv is currently |
669 | * called with bh processing disabled. | |
3df80d93 ACM |
670 | */ |
671 | ||
672 | /* Do Stevens' IPV6_PKTOPTIONS. | |
673 | ||
674 | Yes, guys, it is the only place in our code, where we | |
675 | may make it not affecting IPv4. | |
676 | The rest of code is protocol independent, | |
677 | and I do not like idea to uglify IPv4. | |
678 | ||
679 | Actually, all the idea behind IPV6_PKTOPTIONS | |
680 | looks not very well thought. For now we latch | |
681 | options, received in the last packet, enqueued | |
682 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 683 | --ANK (980728) |
3df80d93 ACM |
684 | */ |
685 | if (np->rxopt.all) | |
89e7e577 GR |
686 | /* |
687 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
688 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
689 | */ | |
3df80d93 ACM |
690 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
691 | ||
692 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
693 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
694 | goto reset; | |
fd169f15 | 695 | if (opt_skb) { |
89e7e577 | 696 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
697 | __kfree_skb(opt_skb); |
698 | } | |
3df80d93 ACM |
699 | return 0; |
700 | } | |
701 | ||
d83ca5ac GR |
702 | /* |
703 | * Step 3: Process LISTEN state | |
704 | * If S.state == LISTEN, | |
705 | * If P.type == Request or P contains a valid Init Cookie option, | |
706 | * (* Must scan the packet's options to check for Init | |
707 | * Cookies. Only Init Cookies are processed here, | |
708 | * however; other options are processed in Step 8. This | |
709 | * scan need only be performed if the endpoint uses Init | |
710 | * Cookies *) | |
711 | * (* Generate a new socket and switch to that socket *) | |
712 | * Set S := new socket for this port pair | |
713 | * S.state = RESPOND | |
714 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
715 | * Initialize S.GAR := S.ISS | |
716 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
717 | * Continue with S.state == RESPOND | |
718 | * (* A Response packet will be generated in Step 11 *) | |
719 | * Otherwise, | |
720 | * Generate Reset(No Connection) unless P.type == Reset | |
721 | * Drop packet and return | |
722 | * | |
723 | * NOTE: the check for the packet types is done in | |
724 | * dccp_rcv_state_process | |
725 | */ | |
45329e71 | 726 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 727 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 728 | |
45329e71 ACM |
729 | if (nsk == NULL) |
730 | goto discard; | |
3df80d93 ACM |
731 | /* |
732 | * Queue it on the new socket if the new socket is active, | |
733 | * otherwise we just shortcircuit this and continue with | |
734 | * the new socket.. | |
735 | */ | |
8109b02b | 736 | if (nsk != sk) { |
3df80d93 ACM |
737 | if (dccp_child_process(sk, nsk, skb)) |
738 | goto reset; | |
45329e71 | 739 | if (opt_skb != NULL) |
3df80d93 ACM |
740 | __kfree_skb(opt_skb); |
741 | return 0; | |
742 | } | |
743 | } | |
744 | ||
745 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
746 | goto reset; | |
fd169f15 | 747 | if (opt_skb) { |
89e7e577 | 748 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
749 | __kfree_skb(opt_skb); |
750 | } | |
3df80d93 ACM |
751 | return 0; |
752 | ||
753 | reset: | |
cfb6eeb4 | 754 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 755 | discard: |
45329e71 | 756 | if (opt_skb != NULL) |
3df80d93 ACM |
757 | __kfree_skb(opt_skb); |
758 | kfree_skb(skb); | |
759 | return 0; | |
760 | } | |
761 | ||
e5bbef20 | 762 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
763 | { |
764 | const struct dccp_hdr *dh; | |
3df80d93 | 765 | struct sock *sk; |
6f4e5fff | 766 | int min_cov; |
3df80d93 | 767 | |
6f4e5fff | 768 | /* Step 1: Check header basics */ |
3df80d93 ACM |
769 | |
770 | if (dccp_invalid_packet(skb)) | |
771 | goto discard_it; | |
772 | ||
6f4e5fff | 773 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
774 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
775 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 776 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
777 | goto discard_it; |
778 | } | |
779 | ||
3df80d93 ACM |
780 | dh = dccp_hdr(skb); |
781 | ||
fde20105 | 782 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
783 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
784 | ||
785 | if (dccp_packet_without_ack(skb)) | |
786 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
787 | else | |
788 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
789 | ||
790 | /* Step 2: | |
8109b02b | 791 | * Look up flow ID in table and get corresponding socket */ |
d86e0dac | 792 | sk = __inet6_lookup(&init_net, &dccp_hashinfo, &ipv6_hdr(skb)->saddr, |
3df80d93 | 793 | dh->dccph_sport, |
0660e03f | 794 | &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport), |
3df80d93 | 795 | inet6_iif(skb)); |
45329e71 | 796 | /* |
3df80d93 | 797 | * Step 2: |
8109b02b | 798 | * If no socket ... |
3df80d93 | 799 | */ |
d23c7107 GR |
800 | if (sk == NULL) { |
801 | dccp_pr_debug("failed to look up flow ID in table and " | |
802 | "get corresponding socket\n"); | |
3df80d93 | 803 | goto no_dccp_socket; |
d23c7107 | 804 | } |
3df80d93 | 805 | |
45329e71 | 806 | /* |
3df80d93 | 807 | * Step 2: |
8109b02b | 808 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
809 | * Generate Reset(No Connection) unless P.type == Reset |
810 | * Drop packet and return | |
811 | */ | |
d23c7107 GR |
812 | if (sk->sk_state == DCCP_TIME_WAIT) { |
813 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
814 | inet_twsk_put(inet_twsk(sk)); | |
815 | goto no_dccp_socket; | |
816 | } | |
3df80d93 | 817 | |
6f4e5fff GR |
818 | /* |
819 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
820 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
821 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
822 | */ |
823 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
824 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
825 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
826 | dh->dccph_cscov, min_cov); | |
827 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
828 | goto discard_and_relse; | |
829 | } | |
830 | ||
3df80d93 ACM |
831 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
832 | goto discard_and_relse; | |
833 | ||
58a5a7b9 | 834 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
835 | |
836 | no_dccp_socket: | |
837 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
838 | goto discard_it; | |
839 | /* | |
840 | * Step 2: | |
8109b02b | 841 | * If no socket ... |
3df80d93 ACM |
842 | * Generate Reset(No Connection) unless P.type == Reset |
843 | * Drop packet and return | |
844 | */ | |
845 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
846 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
847 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 848 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 849 | } |
3df80d93 | 850 | |
d23c7107 | 851 | discard_it: |
3df80d93 ACM |
852 | kfree_skb(skb); |
853 | return 0; | |
854 | ||
855 | discard_and_relse: | |
856 | sock_put(sk); | |
857 | goto discard_it; | |
3df80d93 ACM |
858 | } |
859 | ||
73c9e02c GR |
860 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
861 | int addr_len) | |
862 | { | |
863 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
864 | struct inet_connection_sock *icsk = inet_csk(sk); | |
865 | struct inet_sock *inet = inet_sk(sk); | |
866 | struct ipv6_pinfo *np = inet6_sk(sk); | |
867 | struct dccp_sock *dp = dccp_sk(sk); | |
868 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
869 | struct flowi fl; | |
870 | struct dst_entry *dst; | |
871 | int addr_type; | |
872 | int err; | |
873 | ||
874 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
875 | ||
876 | if (addr_len < SIN6_LEN_RFC2133) | |
877 | return -EINVAL; | |
878 | ||
879 | if (usin->sin6_family != AF_INET6) | |
880 | return -EAFNOSUPPORT; | |
881 | ||
882 | memset(&fl, 0, sizeof(fl)); | |
883 | ||
884 | if (np->sndflow) { | |
885 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
886 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
887 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
888 | struct ip6_flowlabel *flowlabel; | |
889 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
890 | if (flowlabel == NULL) | |
891 | return -EINVAL; | |
892 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
893 | fl6_sock_release(flowlabel); | |
894 | } | |
895 | } | |
896 | /* | |
897 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
898 | */ | |
899 | if (ipv6_addr_any(&usin->sin6_addr)) | |
900 | usin->sin6_addr.s6_addr[15] = 1; | |
901 | ||
902 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
903 | ||
904 | if (addr_type & IPV6_ADDR_MULTICAST) | |
905 | return -ENETUNREACH; | |
906 | ||
907 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
908 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
909 | usin->sin6_scope_id) { | |
910 | /* If interface is set while binding, indices | |
911 | * must coincide. | |
912 | */ | |
913 | if (sk->sk_bound_dev_if && | |
914 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
915 | return -EINVAL; | |
916 | ||
917 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
918 | } | |
919 | ||
920 | /* Connect to link-local address requires an interface */ | |
921 | if (!sk->sk_bound_dev_if) | |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
926 | np->flow_label = fl.fl6_flowlabel; | |
927 | ||
928 | /* | |
929 | * DCCP over IPv4 | |
930 | */ | |
931 | if (addr_type == IPV6_ADDR_MAPPED) { | |
932 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
933 | struct sockaddr_in sin; | |
934 | ||
935 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
936 | ||
937 | if (__ipv6_only_sock(sk)) | |
938 | return -ENETUNREACH; | |
939 | ||
940 | sin.sin_family = AF_INET; | |
941 | sin.sin_port = usin->sin6_port; | |
942 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
943 | ||
944 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
945 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
946 | ||
947 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
948 | if (err) { | |
949 | icsk->icsk_ext_hdr_len = exthdrlen; | |
950 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
951 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
952 | goto failure; | |
953 | } else { | |
954 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
955 | inet->saddr); | |
956 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
957 | inet->rcv_saddr); | |
958 | } | |
959 | ||
960 | return err; | |
961 | } | |
962 | ||
963 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
964 | saddr = &np->rcv_saddr; | |
965 | ||
966 | fl.proto = IPPROTO_DCCP; | |
967 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
968 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
969 | fl.oif = sk->sk_bound_dev_if; | |
970 | fl.fl_ip_dport = usin->sin6_port; | |
971 | fl.fl_ip_sport = inet->sport; | |
972 | security_sk_classify_flow(sk, &fl); | |
973 | ||
974 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
975 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
976 | ||
977 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
978 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
979 | final_p = &final; | |
980 | } | |
981 | ||
982 | err = ip6_dst_lookup(sk, &dst, &fl); | |
983 | if (err) | |
984 | goto failure; | |
985 | ||
986 | if (final_p) | |
987 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
988 | ||
bb72845e | 989 | err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT); |
14e50e57 DM |
990 | if (err < 0) { |
991 | if (err == -EREMOTE) | |
992 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
993 | if (err < 0) | |
994 | goto failure; | |
995 | } | |
73c9e02c GR |
996 | |
997 | if (saddr == NULL) { | |
998 | saddr = &fl.fl6_src; | |
999 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1000 | } | |
1001 | ||
1002 | /* set the source address */ | |
1003 | ipv6_addr_copy(&np->saddr, saddr); | |
1004 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1005 | ||
1006 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1007 | ||
1008 | icsk->icsk_ext_hdr_len = 0; | |
1009 | if (np->opt != NULL) | |
1010 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1011 | np->opt->opt_nflen); | |
1012 | ||
1013 | inet->dport = usin->sin6_port; | |
1014 | ||
1015 | dccp_set_state(sk, DCCP_REQUESTING); | |
1016 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1017 | if (err) | |
1018 | goto late_failure; | |
d7f7365f GR |
1019 | |
1020 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1021 | np->daddr.s6_addr32, | |
1022 | inet->sport, inet->dport); | |
73c9e02c GR |
1023 | err = dccp_connect(sk); |
1024 | if (err) | |
1025 | goto late_failure; | |
1026 | ||
1027 | return 0; | |
1028 | ||
1029 | late_failure: | |
1030 | dccp_set_state(sk, DCCP_CLOSED); | |
1031 | __sk_dst_reset(sk); | |
1032 | failure: | |
1033 | inet->dport = 0; | |
1034 | sk->sk_route_caps = 0; | |
1035 | return err; | |
1036 | } | |
1037 | ||
3df80d93 | 1038 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1039 | .queue_xmit = inet6_csk_xmit, |
1040 | .send_check = dccp_v6_send_check, | |
1041 | .rebuild_header = inet6_sk_rebuild_header, | |
1042 | .conn_request = dccp_v6_conn_request, | |
1043 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1044 | .net_header_len = sizeof(struct ipv6hdr), | |
1045 | .setsockopt = ipv6_setsockopt, | |
1046 | .getsockopt = ipv6_getsockopt, | |
1047 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1048 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1049 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1050 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1051 | .compat_setsockopt = compat_ipv6_setsockopt, |
1052 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1053 | #endif |
3df80d93 ACM |
1054 | }; |
1055 | ||
1056 | /* | |
1057 | * DCCP over IPv4 via INET6 API | |
1058 | */ | |
1059 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1060 | .queue_xmit = ip_queue_xmit, |
1061 | .send_check = dccp_v4_send_check, | |
1062 | .rebuild_header = inet_sk_rebuild_header, | |
1063 | .conn_request = dccp_v6_conn_request, | |
1064 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1065 | .net_header_len = sizeof(struct iphdr), | |
1066 | .setsockopt = ipv6_setsockopt, | |
1067 | .getsockopt = ipv6_getsockopt, | |
1068 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1069 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1070 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1071 | .compat_setsockopt = compat_ipv6_setsockopt, |
1072 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1073 | #endif |
3df80d93 ACM |
1074 | }; |
1075 | ||
1076 | /* NOTE: A lot of things set to zero explicitly by call to | |
1077 | * sk_alloc() so need not be done here. | |
1078 | */ | |
1079 | static int dccp_v6_init_sock(struct sock *sk) | |
1080 | { | |
72478873 ACM |
1081 | static __u8 dccp_v6_ctl_sock_initialized; |
1082 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1083 | |
72478873 ACM |
1084 | if (err == 0) { |
1085 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1086 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1087 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1088 | } |
3df80d93 ACM |
1089 | |
1090 | return err; | |
1091 | } | |
1092 | ||
1093 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1094 | { | |
3e0fadc5 | 1095 | dccp_destroy_sock(sk); |
3df80d93 ACM |
1096 | return inet6_destroy_sock(sk); |
1097 | } | |
1098 | ||
73c9e02c GR |
1099 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1100 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1101 | }; | |
1102 | ||
3df80d93 | 1103 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1104 | .name = "DCCPv6", |
1105 | .owner = THIS_MODULE, | |
1106 | .close = dccp_close, | |
1107 | .connect = dccp_v6_connect, | |
1108 | .disconnect = dccp_disconnect, | |
1109 | .ioctl = dccp_ioctl, | |
1110 | .init = dccp_v6_init_sock, | |
1111 | .setsockopt = dccp_setsockopt, | |
1112 | .getsockopt = dccp_getsockopt, | |
1113 | .sendmsg = dccp_sendmsg, | |
1114 | .recvmsg = dccp_recvmsg, | |
1115 | .backlog_rcv = dccp_v6_do_rcv, | |
1116 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1117 | .unhash = inet_unhash, |
543d9cfe | 1118 | .accept = inet_csk_accept, |
ab1e0a13 | 1119 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1120 | .shutdown = dccp_shutdown, |
1121 | .destroy = dccp_v6_destroy_sock, | |
1122 | .orphan_count = &dccp_orphan_count, | |
1123 | .max_header = MAX_DCCP_HEADER, | |
1124 | .obj_size = sizeof(struct dccp6_sock), | |
1125 | .rsk_prot = &dccp6_request_sock_ops, | |
1126 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1127 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1128 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1129 | .compat_setsockopt = compat_dccp_setsockopt, |
1130 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1131 | #endif |
3df80d93 ACM |
1132 | }; |
1133 | ||
1134 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1135 | .handler = dccp_v6_rcv, |
1136 | .err_handler = dccp_v6_err, | |
1137 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1138 | }; |
1139 | ||
1140 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1141 | .family = PF_INET6, |
1142 | .owner = THIS_MODULE, | |
1143 | .release = inet6_release, | |
1144 | .bind = inet6_bind, | |
1145 | .connect = inet_stream_connect, | |
1146 | .socketpair = sock_no_socketpair, | |
1147 | .accept = inet_accept, | |
1148 | .getname = inet6_getname, | |
1149 | .poll = dccp_poll, | |
1150 | .ioctl = inet6_ioctl, | |
1151 | .listen = inet_dccp_listen, | |
1152 | .shutdown = inet_shutdown, | |
1153 | .setsockopt = sock_common_setsockopt, | |
1154 | .getsockopt = sock_common_getsockopt, | |
1155 | .sendmsg = inet_sendmsg, | |
1156 | .recvmsg = sock_common_recvmsg, | |
1157 | .mmap = sock_no_mmap, | |
1158 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1159 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1160 | .compat_setsockopt = compat_sock_common_setsockopt, |
1161 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1162 | #endif |
3df80d93 ACM |
1163 | }; |
1164 | ||
1165 | static struct inet_protosw dccp_v6_protosw = { | |
1166 | .type = SOCK_DCCP, | |
1167 | .protocol = IPPROTO_DCCP, | |
1168 | .prot = &dccp_v6_prot, | |
1169 | .ops = &inet6_dccp_ops, | |
1170 | .capability = -1, | |
d83d8461 | 1171 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1172 | }; |
1173 | ||
8231bd27 PE |
1174 | static int dccp_v6_init_net(struct net *net) |
1175 | { | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static void dccp_v6_exit_net(struct net *net) | |
1180 | { | |
1181 | } | |
1182 | ||
1183 | static struct pernet_operations dccp_v6_ops = { | |
1184 | .init = dccp_v6_init_net, | |
1185 | .exit = dccp_v6_exit_net, | |
1186 | }; | |
1187 | ||
3df80d93 ACM |
1188 | static int __init dccp_v6_init(void) |
1189 | { | |
1190 | int err = proto_register(&dccp_v6_prot, 1); | |
1191 | ||
1192 | if (err != 0) | |
1193 | goto out; | |
1194 | ||
1195 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1196 | if (err != 0) | |
1197 | goto out_unregister_proto; | |
1198 | ||
1199 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1200 | |
02047741 | 1201 | err = inet_ctl_sock_create(&init_net.dccp.v6_ctl_sk, PF_INET6, |
5677242f | 1202 | SOCK_DCCP, IPPROTO_DCCP, &init_net); |
c4d93909 | 1203 | if (err != 0) |
72478873 | 1204 | goto out_unregister_protosw; |
8231bd27 PE |
1205 | |
1206 | err = register_pernet_subsys(&dccp_v6_ops); | |
1207 | if (err != 0) | |
1208 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1209 | out: |
1210 | return err; | |
8231bd27 PE |
1211 | |
1212 | out_destroy_ctl_sock: | |
02047741 | 1213 | inet_ctl_sock_destroy(init_net.dccp.v6_ctl_sk); |
72478873 ACM |
1214 | out_unregister_protosw: |
1215 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1216 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1217 | out_unregister_proto: |
1218 | proto_unregister(&dccp_v6_prot); | |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | static void __exit dccp_v6_exit(void) | |
1223 | { | |
8231bd27 | 1224 | unregister_pernet_subsys(&dccp_v6_ops); |
02047741 | 1225 | inet_ctl_sock_destroy(init_net.dccp.v6_ctl_sk); |
3df80d93 ACM |
1226 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1227 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1228 | proto_unregister(&dccp_v6_prot); | |
1229 | } | |
1230 | ||
1231 | module_init(dccp_v6_init); | |
1232 | module_exit(dccp_v6_exit); | |
1233 | ||
1234 | /* | |
1235 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1236 | * values directly, Also cover the case where the protocol is not specified, | |
1237 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1238 | */ | |
7131c6c7 JD |
1239 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1240 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1241 | MODULE_LICENSE("GPL"); |
1242 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1243 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |