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 | |
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 | |
425 | if (ipv6_opt_accepted(sk, skb) || | |
426 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
427 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
428 | atomic_inc(&skb->users); | |
429 | ireq6->pktopts = skb; | |
430 | } | |
431 | ireq6->iif = sk->sk_bound_dev_if; | |
432 | ||
433 | /* So that link locals have meaning */ | |
434 | if (!sk->sk_bound_dev_if && | |
435 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
436 | ireq6->iif = inet6_iif(skb); | |
437 | ||
45329e71 | 438 | /* |
3df80d93 ACM |
439 | * Step 3: Process LISTEN state |
440 | * | |
d83ca5ac | 441 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 442 | * |
d83ca5ac GR |
443 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
444 | * dccp_create_openreq_child. | |
3df80d93 | 445 | */ |
3df80d93 | 446 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 447 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
448 | dreq->dreq_service = service; |
449 | ||
fd80eb94 | 450 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
451 | goto drop_and_free; |
452 | ||
453 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
454 | return 0; | |
455 | ||
456 | drop_and_free: | |
457 | reqsk_free(req); | |
458 | drop: | |
459 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
460 | return -1; |
461 | } | |
462 | ||
463 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
464 | struct sk_buff *skb, | |
465 | struct request_sock *req, | |
466 | struct dst_entry *dst) | |
467 | { | |
468 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
469 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
470 | struct inet_sock *newinet; | |
471 | struct dccp_sock *newdp; | |
472 | struct dccp6_sock *newdp6; | |
473 | struct sock *newsk; | |
474 | struct ipv6_txoptions *opt; | |
475 | ||
476 | if (skb->protocol == htons(ETH_P_IP)) { | |
477 | /* | |
478 | * v6 mapped | |
479 | */ | |
3df80d93 | 480 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 481 | if (newsk == NULL) |
3df80d93 ACM |
482 | return NULL; |
483 | ||
484 | newdp6 = (struct dccp6_sock *)newsk; | |
485 | newdp = dccp_sk(newsk); | |
486 | newinet = inet_sk(newsk); | |
487 | newinet->pinet6 = &newdp6->inet6; | |
488 | newnp = inet6_sk(newsk); | |
489 | ||
490 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
491 | ||
492 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
493 | newinet->daddr); | |
494 | ||
495 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
496 | newinet->saddr); | |
497 | ||
498 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
499 | ||
500 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
501 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
502 | newnp->pktoptions = NULL; | |
503 | newnp->opt = NULL; | |
504 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 505 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
506 | |
507 | /* | |
508 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
509 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
510 | * that function for the gory details. -acme | |
511 | */ | |
512 | ||
513 | /* It is tricky place. Until this moment IPv4 tcp | |
514 | worked with IPv6 icsk.icsk_af_ops. | |
515 | Sync it now. | |
516 | */ | |
d83d8461 | 517 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
518 | |
519 | return newsk; | |
520 | } | |
521 | ||
522 | opt = np->opt; | |
523 | ||
524 | if (sk_acceptq_is_full(sk)) | |
525 | goto out_overflow; | |
526 | ||
3df80d93 ACM |
527 | if (dst == NULL) { |
528 | struct in6_addr *final_p = NULL, final; | |
529 | struct flowi fl; | |
530 | ||
531 | memset(&fl, 0, sizeof(fl)); | |
532 | fl.proto = IPPROTO_DCCP; | |
533 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
534 | if (opt != NULL && opt->srcrt != NULL) { |
535 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
536 | ||
3df80d93 ACM |
537 | ipv6_addr_copy(&final, &fl.fl6_dst); |
538 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
539 | final_p = &final; | |
540 | } | |
541 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
542 | fl.oif = sk->sk_bound_dev_if; | |
543 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
544 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
beb8d13b | 545 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
546 | |
547 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
548 | goto out; | |
549 | ||
550 | if (final_p) | |
551 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
552 | ||
553 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
554 | goto out; | |
45329e71 | 555 | } |
3df80d93 ACM |
556 | |
557 | newsk = dccp_create_openreq_child(sk, req, skb); | |
558 | if (newsk == NULL) | |
559 | goto out; | |
560 | ||
561 | /* | |
562 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
563 | * count here, dccp_create_openreq_child now does this for us, see the | |
564 | * comment in that function for the gory details. -acme | |
565 | */ | |
566 | ||
8e1ef0a9 | 567 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
568 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
569 | NETIF_F_TSO); | |
3df80d93 ACM |
570 | newdp6 = (struct dccp6_sock *)newsk; |
571 | newinet = inet_sk(newsk); | |
572 | newinet->pinet6 = &newdp6->inet6; | |
573 | newdp = dccp_sk(newsk); | |
574 | newnp = inet6_sk(newsk); | |
575 | ||
576 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
577 | ||
578 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
579 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
580 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
581 | newsk->sk_bound_dev_if = ireq6->iif; | |
582 | ||
45329e71 | 583 | /* Now IPv6 options... |
3df80d93 ACM |
584 | |
585 | First: no IPv4 options. | |
586 | */ | |
587 | newinet->opt = NULL; | |
588 | ||
589 | /* Clone RX bits */ | |
590 | newnp->rxopt.all = np->rxopt.all; | |
591 | ||
592 | /* Clone pktoptions received with SYN */ | |
593 | newnp->pktoptions = NULL; | |
594 | if (ireq6->pktopts != NULL) { | |
595 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
596 | kfree_skb(ireq6->pktopts); | |
597 | ireq6->pktopts = NULL; | |
598 | if (newnp->pktoptions) | |
599 | skb_set_owner_r(newnp->pktoptions, newsk); | |
600 | } | |
601 | newnp->opt = NULL; | |
602 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 603 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 604 | |
45329e71 ACM |
605 | /* |
606 | * Clone native IPv6 options from listening socket (if any) | |
607 | * | |
608 | * Yes, keeping reference count would be much more clever, but we make | |
609 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 610 | */ |
45329e71 | 611 | if (opt != NULL) { |
3df80d93 ACM |
612 | newnp->opt = ipv6_dup_options(newsk, opt); |
613 | if (opt != np->opt) | |
614 | sock_kfree_s(sk, opt, opt->tot_len); | |
615 | } | |
616 | ||
d83d8461 | 617 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 618 | if (newnp->opt != NULL) |
d83d8461 ACM |
619 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
620 | newnp->opt->opt_flen); | |
3df80d93 ACM |
621 | |
622 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
623 | ||
624 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
625 | ||
ab1e0a13 | 626 | __inet6_hash(newsk); |
e56d8b8a | 627 | __inet_inherit_port(sk, newsk); |
3df80d93 ACM |
628 | |
629 | return newsk; | |
630 | ||
631 | out_overflow: | |
632 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
633 | out: | |
634 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
45329e71 | 635 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
636 | sock_kfree_s(sk, opt, opt->tot_len); |
637 | dst_release(dst); | |
638 | return NULL; | |
639 | } | |
640 | ||
641 | /* The socket must have it's spinlock held when we get | |
642 | * here. | |
643 | * | |
644 | * We have a potential double-lock case here, so even when | |
645 | * doing backlog processing we use the BH locking scheme. | |
646 | * This is because we cannot sleep with the original spinlock | |
647 | * held. | |
648 | */ | |
649 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
650 | { | |
651 | struct ipv6_pinfo *np = inet6_sk(sk); | |
652 | struct sk_buff *opt_skb = NULL; | |
653 | ||
654 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
655 | goes to IPv4 receive handler and backlogged. | |
656 | From backlog it always goes here. Kerboom... | |
657 | Fortunately, dccp_rcv_established and rcv_established | |
658 | handle them correctly, but it is not case with | |
659 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
660 | */ | |
661 | ||
662 | if (skb->protocol == htons(ETH_P_IP)) | |
663 | return dccp_v4_do_rcv(sk, skb); | |
664 | ||
fda9ef5d | 665 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
666 | goto discard; |
667 | ||
668 | /* | |
45329e71 ACM |
669 | * socket locking is here for SMP purposes as backlog rcv is currently |
670 | * called with bh processing disabled. | |
3df80d93 ACM |
671 | */ |
672 | ||
673 | /* Do Stevens' IPV6_PKTOPTIONS. | |
674 | ||
675 | Yes, guys, it is the only place in our code, where we | |
676 | may make it not affecting IPv4. | |
677 | The rest of code is protocol independent, | |
678 | and I do not like idea to uglify IPv4. | |
679 | ||
680 | Actually, all the idea behind IPV6_PKTOPTIONS | |
681 | looks not very well thought. For now we latch | |
682 | options, received in the last packet, enqueued | |
683 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 684 | --ANK (980728) |
3df80d93 ACM |
685 | */ |
686 | if (np->rxopt.all) | |
89e7e577 GR |
687 | /* |
688 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
689 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
690 | */ | |
3df80d93 ACM |
691 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
692 | ||
693 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
694 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
695 | goto reset; | |
fd169f15 | 696 | if (opt_skb) { |
89e7e577 | 697 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
698 | __kfree_skb(opt_skb); |
699 | } | |
3df80d93 ACM |
700 | return 0; |
701 | } | |
702 | ||
d83ca5ac GR |
703 | /* |
704 | * Step 3: Process LISTEN state | |
705 | * If S.state == LISTEN, | |
706 | * If P.type == Request or P contains a valid Init Cookie option, | |
707 | * (* Must scan the packet's options to check for Init | |
708 | * Cookies. Only Init Cookies are processed here, | |
709 | * however; other options are processed in Step 8. This | |
710 | * scan need only be performed if the endpoint uses Init | |
711 | * Cookies *) | |
712 | * (* Generate a new socket and switch to that socket *) | |
713 | * Set S := new socket for this port pair | |
714 | * S.state = RESPOND | |
715 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
716 | * Initialize S.GAR := S.ISS | |
717 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
718 | * Continue with S.state == RESPOND | |
719 | * (* A Response packet will be generated in Step 11 *) | |
720 | * Otherwise, | |
721 | * Generate Reset(No Connection) unless P.type == Reset | |
722 | * Drop packet and return | |
723 | * | |
724 | * NOTE: the check for the packet types is done in | |
725 | * dccp_rcv_state_process | |
726 | */ | |
45329e71 | 727 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 728 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 729 | |
45329e71 ACM |
730 | if (nsk == NULL) |
731 | goto discard; | |
3df80d93 ACM |
732 | /* |
733 | * Queue it on the new socket if the new socket is active, | |
734 | * otherwise we just shortcircuit this and continue with | |
735 | * the new socket.. | |
736 | */ | |
8109b02b | 737 | if (nsk != sk) { |
3df80d93 ACM |
738 | if (dccp_child_process(sk, nsk, skb)) |
739 | goto reset; | |
45329e71 | 740 | if (opt_skb != NULL) |
3df80d93 ACM |
741 | __kfree_skb(opt_skb); |
742 | return 0; | |
743 | } | |
744 | } | |
745 | ||
746 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
747 | goto reset; | |
fd169f15 | 748 | if (opt_skb) { |
89e7e577 | 749 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
750 | __kfree_skb(opt_skb); |
751 | } | |
3df80d93 ACM |
752 | return 0; |
753 | ||
754 | reset: | |
cfb6eeb4 | 755 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 756 | discard: |
45329e71 | 757 | if (opt_skb != NULL) |
3df80d93 ACM |
758 | __kfree_skb(opt_skb); |
759 | kfree_skb(skb); | |
760 | return 0; | |
761 | } | |
762 | ||
e5bbef20 | 763 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
764 | { |
765 | const struct dccp_hdr *dh; | |
3df80d93 | 766 | struct sock *sk; |
6f4e5fff | 767 | int min_cov; |
3df80d93 | 768 | |
6f4e5fff | 769 | /* Step 1: Check header basics */ |
3df80d93 ACM |
770 | |
771 | if (dccp_invalid_packet(skb)) | |
772 | goto discard_it; | |
773 | ||
6f4e5fff | 774 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
775 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
776 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 777 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
778 | goto discard_it; |
779 | } | |
780 | ||
3df80d93 ACM |
781 | dh = dccp_hdr(skb); |
782 | ||
fde20105 | 783 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
784 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
785 | ||
786 | if (dccp_packet_without_ack(skb)) | |
787 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
788 | else | |
789 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
790 | ||
791 | /* Step 2: | |
8109b02b | 792 | * Look up flow ID in table and get corresponding socket */ |
671a1c74 PE |
793 | sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo, |
794 | &ipv6_hdr(skb)->saddr, dh->dccph_sport, | |
0660e03f | 795 | &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport), |
3df80d93 | 796 | inet6_iif(skb)); |
45329e71 | 797 | /* |
3df80d93 | 798 | * Step 2: |
8109b02b | 799 | * If no socket ... |
3df80d93 | 800 | */ |
d23c7107 GR |
801 | if (sk == NULL) { |
802 | dccp_pr_debug("failed to look up flow ID in table and " | |
803 | "get corresponding socket\n"); | |
3df80d93 | 804 | goto no_dccp_socket; |
d23c7107 | 805 | } |
3df80d93 | 806 | |
45329e71 | 807 | /* |
3df80d93 | 808 | * Step 2: |
8109b02b | 809 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
810 | * Generate Reset(No Connection) unless P.type == Reset |
811 | * Drop packet and return | |
812 | */ | |
d23c7107 GR |
813 | if (sk->sk_state == DCCP_TIME_WAIT) { |
814 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
815 | inet_twsk_put(inet_twsk(sk)); | |
816 | goto no_dccp_socket; | |
817 | } | |
3df80d93 | 818 | |
6f4e5fff GR |
819 | /* |
820 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
821 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
822 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
823 | */ |
824 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
825 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
826 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
827 | dh->dccph_cscov, min_cov); | |
828 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
829 | goto discard_and_relse; | |
830 | } | |
831 | ||
3df80d93 ACM |
832 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
833 | goto discard_and_relse; | |
834 | ||
58a5a7b9 | 835 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
836 | |
837 | no_dccp_socket: | |
838 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
839 | goto discard_it; | |
840 | /* | |
841 | * Step 2: | |
8109b02b | 842 | * If no socket ... |
3df80d93 ACM |
843 | * Generate Reset(No Connection) unless P.type == Reset |
844 | * Drop packet and return | |
845 | */ | |
846 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
847 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
848 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 849 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 850 | } |
3df80d93 | 851 | |
d23c7107 | 852 | discard_it: |
3df80d93 ACM |
853 | kfree_skb(skb); |
854 | return 0; | |
855 | ||
856 | discard_and_relse: | |
857 | sock_put(sk); | |
858 | goto discard_it; | |
3df80d93 ACM |
859 | } |
860 | ||
73c9e02c GR |
861 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
862 | int addr_len) | |
863 | { | |
864 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
865 | struct inet_connection_sock *icsk = inet_csk(sk); | |
866 | struct inet_sock *inet = inet_sk(sk); | |
867 | struct ipv6_pinfo *np = inet6_sk(sk); | |
868 | struct dccp_sock *dp = dccp_sk(sk); | |
869 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
870 | struct flowi fl; | |
871 | struct dst_entry *dst; | |
872 | int addr_type; | |
873 | int err; | |
874 | ||
875 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
876 | ||
877 | if (addr_len < SIN6_LEN_RFC2133) | |
878 | return -EINVAL; | |
879 | ||
880 | if (usin->sin6_family != AF_INET6) | |
881 | return -EAFNOSUPPORT; | |
882 | ||
883 | memset(&fl, 0, sizeof(fl)); | |
884 | ||
885 | if (np->sndflow) { | |
886 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
887 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
888 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
889 | struct ip6_flowlabel *flowlabel; | |
890 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
891 | if (flowlabel == NULL) | |
892 | return -EINVAL; | |
893 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
894 | fl6_sock_release(flowlabel); | |
895 | } | |
896 | } | |
897 | /* | |
898 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
899 | */ | |
900 | if (ipv6_addr_any(&usin->sin6_addr)) | |
901 | usin->sin6_addr.s6_addr[15] = 1; | |
902 | ||
903 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
904 | ||
905 | if (addr_type & IPV6_ADDR_MULTICAST) | |
906 | return -ENETUNREACH; | |
907 | ||
908 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
909 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
910 | usin->sin6_scope_id) { | |
911 | /* If interface is set while binding, indices | |
912 | * must coincide. | |
913 | */ | |
914 | if (sk->sk_bound_dev_if && | |
915 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
916 | return -EINVAL; | |
917 | ||
918 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
919 | } | |
920 | ||
921 | /* Connect to link-local address requires an interface */ | |
922 | if (!sk->sk_bound_dev_if) | |
923 | return -EINVAL; | |
924 | } | |
925 | ||
926 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
927 | np->flow_label = fl.fl6_flowlabel; | |
928 | ||
929 | /* | |
930 | * DCCP over IPv4 | |
931 | */ | |
932 | if (addr_type == IPV6_ADDR_MAPPED) { | |
933 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
934 | struct sockaddr_in sin; | |
935 | ||
936 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
937 | ||
938 | if (__ipv6_only_sock(sk)) | |
939 | return -ENETUNREACH; | |
940 | ||
941 | sin.sin_family = AF_INET; | |
942 | sin.sin_port = usin->sin6_port; | |
943 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
944 | ||
945 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
946 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
947 | ||
948 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
949 | if (err) { | |
950 | icsk->icsk_ext_hdr_len = exthdrlen; | |
951 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
952 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
953 | goto failure; | |
954 | } else { | |
955 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
956 | inet->saddr); | |
957 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
958 | inet->rcv_saddr); | |
959 | } | |
960 | ||
961 | return err; | |
962 | } | |
963 | ||
964 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
965 | saddr = &np->rcv_saddr; | |
966 | ||
967 | fl.proto = IPPROTO_DCCP; | |
968 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
969 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
970 | fl.oif = sk->sk_bound_dev_if; | |
971 | fl.fl_ip_dport = usin->sin6_port; | |
972 | fl.fl_ip_sport = inet->sport; | |
973 | security_sk_classify_flow(sk, &fl); | |
974 | ||
975 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
976 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
977 | ||
978 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
979 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
980 | final_p = &final; | |
981 | } | |
982 | ||
983 | err = ip6_dst_lookup(sk, &dst, &fl); | |
984 | if (err) | |
985 | goto failure; | |
986 | ||
987 | if (final_p) | |
988 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
989 | ||
bb72845e | 990 | err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT); |
14e50e57 DM |
991 | if (err < 0) { |
992 | if (err == -EREMOTE) | |
993 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
994 | if (err < 0) | |
995 | goto failure; | |
996 | } | |
73c9e02c GR |
997 | |
998 | if (saddr == NULL) { | |
999 | saddr = &fl.fl6_src; | |
1000 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1001 | } | |
1002 | ||
1003 | /* set the source address */ | |
1004 | ipv6_addr_copy(&np->saddr, saddr); | |
1005 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1006 | ||
1007 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1008 | ||
1009 | icsk->icsk_ext_hdr_len = 0; | |
1010 | if (np->opt != NULL) | |
1011 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1012 | np->opt->opt_nflen); | |
1013 | ||
1014 | inet->dport = usin->sin6_port; | |
1015 | ||
1016 | dccp_set_state(sk, DCCP_REQUESTING); | |
1017 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1018 | if (err) | |
1019 | goto late_failure; | |
d7f7365f GR |
1020 | |
1021 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1022 | np->daddr.s6_addr32, | |
1023 | inet->sport, inet->dport); | |
73c9e02c GR |
1024 | err = dccp_connect(sk); |
1025 | if (err) | |
1026 | goto late_failure; | |
1027 | ||
1028 | return 0; | |
1029 | ||
1030 | late_failure: | |
1031 | dccp_set_state(sk, DCCP_CLOSED); | |
1032 | __sk_dst_reset(sk); | |
1033 | failure: | |
1034 | inet->dport = 0; | |
1035 | sk->sk_route_caps = 0; | |
1036 | return err; | |
1037 | } | |
1038 | ||
3df80d93 | 1039 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1040 | .queue_xmit = inet6_csk_xmit, |
1041 | .send_check = dccp_v6_send_check, | |
1042 | .rebuild_header = inet6_sk_rebuild_header, | |
1043 | .conn_request = dccp_v6_conn_request, | |
1044 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1045 | .net_header_len = sizeof(struct ipv6hdr), | |
1046 | .setsockopt = ipv6_setsockopt, | |
1047 | .getsockopt = ipv6_getsockopt, | |
1048 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1049 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1050 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1051 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1052 | .compat_setsockopt = compat_ipv6_setsockopt, |
1053 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1054 | #endif |
3df80d93 ACM |
1055 | }; |
1056 | ||
1057 | /* | |
1058 | * DCCP over IPv4 via INET6 API | |
1059 | */ | |
1060 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1061 | .queue_xmit = ip_queue_xmit, |
1062 | .send_check = dccp_v4_send_check, | |
1063 | .rebuild_header = inet_sk_rebuild_header, | |
1064 | .conn_request = dccp_v6_conn_request, | |
1065 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1066 | .net_header_len = sizeof(struct iphdr), | |
1067 | .setsockopt = ipv6_setsockopt, | |
1068 | .getsockopt = ipv6_getsockopt, | |
1069 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1070 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1071 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1072 | .compat_setsockopt = compat_ipv6_setsockopt, |
1073 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1074 | #endif |
3df80d93 ACM |
1075 | }; |
1076 | ||
1077 | /* NOTE: A lot of things set to zero explicitly by call to | |
1078 | * sk_alloc() so need not be done here. | |
1079 | */ | |
1080 | static int dccp_v6_init_sock(struct sock *sk) | |
1081 | { | |
72478873 ACM |
1082 | static __u8 dccp_v6_ctl_sock_initialized; |
1083 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1084 | |
72478873 ACM |
1085 | if (err == 0) { |
1086 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1087 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1088 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1089 | } |
3df80d93 ACM |
1090 | |
1091 | return err; | |
1092 | } | |
1093 | ||
7d06b2e0 | 1094 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1095 | { |
3e0fadc5 | 1096 | dccp_destroy_sock(sk); |
7d06b2e0 | 1097 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1098 | } |
1099 | ||
73c9e02c GR |
1100 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1101 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1102 | }; | |
1103 | ||
3df80d93 | 1104 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1105 | .name = "DCCPv6", |
1106 | .owner = THIS_MODULE, | |
1107 | .close = dccp_close, | |
1108 | .connect = dccp_v6_connect, | |
1109 | .disconnect = dccp_disconnect, | |
1110 | .ioctl = dccp_ioctl, | |
1111 | .init = dccp_v6_init_sock, | |
1112 | .setsockopt = dccp_setsockopt, | |
1113 | .getsockopt = dccp_getsockopt, | |
1114 | .sendmsg = dccp_sendmsg, | |
1115 | .recvmsg = dccp_recvmsg, | |
1116 | .backlog_rcv = dccp_v6_do_rcv, | |
1117 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1118 | .unhash = inet_unhash, |
543d9cfe | 1119 | .accept = inet_csk_accept, |
ab1e0a13 | 1120 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1121 | .shutdown = dccp_shutdown, |
1122 | .destroy = dccp_v6_destroy_sock, | |
1123 | .orphan_count = &dccp_orphan_count, | |
1124 | .max_header = MAX_DCCP_HEADER, | |
1125 | .obj_size = sizeof(struct dccp6_sock), | |
1126 | .rsk_prot = &dccp6_request_sock_ops, | |
1127 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1128 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1129 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1130 | .compat_setsockopt = compat_dccp_setsockopt, |
1131 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1132 | #endif |
3df80d93 ACM |
1133 | }; |
1134 | ||
1135 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1136 | .handler = dccp_v6_rcv, |
1137 | .err_handler = dccp_v6_err, | |
1138 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1139 | }; |
1140 | ||
1141 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1142 | .family = PF_INET6, |
1143 | .owner = THIS_MODULE, | |
1144 | .release = inet6_release, | |
1145 | .bind = inet6_bind, | |
1146 | .connect = inet_stream_connect, | |
1147 | .socketpair = sock_no_socketpair, | |
1148 | .accept = inet_accept, | |
1149 | .getname = inet6_getname, | |
1150 | .poll = dccp_poll, | |
1151 | .ioctl = inet6_ioctl, | |
1152 | .listen = inet_dccp_listen, | |
1153 | .shutdown = inet_shutdown, | |
1154 | .setsockopt = sock_common_setsockopt, | |
1155 | .getsockopt = sock_common_getsockopt, | |
1156 | .sendmsg = inet_sendmsg, | |
1157 | .recvmsg = sock_common_recvmsg, | |
1158 | .mmap = sock_no_mmap, | |
1159 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1160 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1161 | .compat_setsockopt = compat_sock_common_setsockopt, |
1162 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1163 | #endif |
3df80d93 ACM |
1164 | }; |
1165 | ||
1166 | static struct inet_protosw dccp_v6_protosw = { | |
1167 | .type = SOCK_DCCP, | |
1168 | .protocol = IPPROTO_DCCP, | |
1169 | .prot = &dccp_v6_prot, | |
1170 | .ops = &inet6_dccp_ops, | |
1171 | .capability = -1, | |
d83d8461 | 1172 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1173 | }; |
1174 | ||
8231bd27 PE |
1175 | static int dccp_v6_init_net(struct net *net) |
1176 | { | |
334527d3 PE |
1177 | int err; |
1178 | ||
1179 | err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, | |
1180 | SOCK_DCCP, IPPROTO_DCCP, net); | |
1181 | return err; | |
8231bd27 PE |
1182 | } |
1183 | ||
1184 | static void dccp_v6_exit_net(struct net *net) | |
1185 | { | |
334527d3 | 1186 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1187 | } |
1188 | ||
1189 | static struct pernet_operations dccp_v6_ops = { | |
1190 | .init = dccp_v6_init_net, | |
1191 | .exit = dccp_v6_exit_net, | |
1192 | }; | |
1193 | ||
3df80d93 ACM |
1194 | static int __init dccp_v6_init(void) |
1195 | { | |
1196 | int err = proto_register(&dccp_v6_prot, 1); | |
1197 | ||
1198 | if (err != 0) | |
1199 | goto out; | |
1200 | ||
1201 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1202 | if (err != 0) | |
1203 | goto out_unregister_proto; | |
1204 | ||
1205 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1206 | |
8231bd27 PE |
1207 | err = register_pernet_subsys(&dccp_v6_ops); |
1208 | if (err != 0) | |
1209 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1210 | out: |
1211 | return err; | |
8231bd27 PE |
1212 | |
1213 | out_destroy_ctl_sock: | |
72478873 ACM |
1214 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1215 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1216 | out_unregister_proto: |
1217 | proto_unregister(&dccp_v6_prot); | |
1218 | goto out; | |
1219 | } | |
1220 | ||
1221 | static void __exit dccp_v6_exit(void) | |
1222 | { | |
8231bd27 | 1223 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1224 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1225 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1226 | proto_unregister(&dccp_v6_prot); | |
1227 | } | |
1228 | ||
1229 | module_init(dccp_v6_init); | |
1230 | module_exit(dccp_v6_exit); | |
1231 | ||
1232 | /* | |
1233 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1234 | * values directly, Also cover the case where the protocol is not specified, | |
1235 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1236 | */ | |
7131c6c7 JD |
1237 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1238 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1239 | MODULE_LICENSE("GPL"); |
1240 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1241 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |