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