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); | |
e0bcfb0c | 92 | struct dccp_sock *dp; |
3df80d93 ACM |
93 | struct ipv6_pinfo *np; |
94 | struct sock *sk; | |
95 | int err; | |
96 | __u64 seq; | |
ca12a1a4 | 97 | struct net *net = dev_net(skb->dev); |
3df80d93 | 98 | |
860239c5 WY |
99 | if (skb->len < offset + sizeof(*dh) || |
100 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
e41b5368 DL |
101 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
102 | ICMP6_MIB_INERRORS); | |
860239c5 WY |
103 | return; |
104 | } | |
105 | ||
ca12a1a4 | 106 | sk = inet6_lookup(net, &dccp_hashinfo, |
671a1c74 | 107 | &hdr->daddr, dh->dccph_dport, |
d86e0dac | 108 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
109 | |
110 | if (sk == NULL) { | |
e41b5368 DL |
111 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
112 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
113 | return; |
114 | } | |
115 | ||
116 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 117 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
118 | return; |
119 | } | |
120 | ||
121 | bh_lock_sock(sk); | |
122 | if (sock_owned_by_user(sk)) | |
de0744af | 123 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
124 | |
125 | if (sk->sk_state == DCCP_CLOSED) | |
126 | goto out; | |
127 | ||
e0bcfb0c WY |
128 | dp = dccp_sk(sk); |
129 | seq = dccp_hdr_seq(dh); | |
130 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && | |
131 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
132 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
133 | goto out; | |
134 | } | |
135 | ||
3df80d93 ACM |
136 | np = inet6_sk(sk); |
137 | ||
138 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
139 | struct dst_entry *dst = NULL; |
140 | ||
141 | if (sock_owned_by_user(sk)) | |
142 | goto out; | |
143 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
144 | goto out; | |
145 | ||
146 | /* icmp should have updated the destination cache entry */ | |
147 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
148 | if (dst == NULL) { |
149 | struct inet_sock *inet = inet_sk(sk); | |
150 | struct flowi fl; | |
151 | ||
152 | /* BUGGG_FUTURE: Again, it is not clear how | |
153 | to handle rthdr case. Ignore this complexity | |
154 | for now. | |
155 | */ | |
156 | memset(&fl, 0, sizeof(fl)); | |
157 | fl.proto = IPPROTO_DCCP; | |
158 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
159 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
160 | fl.oif = sk->sk_bound_dev_if; | |
161 | fl.fl_ip_dport = inet->dport; | |
162 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 163 | security_sk_classify_flow(sk, &fl); |
3df80d93 | 164 | |
45329e71 ACM |
165 | err = ip6_dst_lookup(sk, &dst, &fl); |
166 | if (err) { | |
3df80d93 ACM |
167 | sk->sk_err_soft = -err; |
168 | goto out; | |
169 | } | |
170 | ||
52479b62 | 171 | err = xfrm_lookup(net, &dst, &fl, sk, 0); |
45329e71 | 172 | if (err < 0) { |
3df80d93 ACM |
173 | sk->sk_err_soft = -err; |
174 | goto out; | |
175 | } | |
3df80d93 ACM |
176 | } else |
177 | dst_hold(dst); | |
178 | ||
d83d8461 | 179 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
180 | dccp_sync_mss(sk, dst_mtu(dst)); |
181 | } /* else let the usual retransmit timer handle it */ | |
182 | dst_release(dst); | |
183 | goto out; | |
184 | } | |
185 | ||
186 | icmpv6_err_convert(type, code, &err); | |
187 | ||
3df80d93 ACM |
188 | /* Might be for an request_sock */ |
189 | switch (sk->sk_state) { | |
190 | struct request_sock *req, **prev; | |
191 | case DCCP_LISTEN: | |
192 | if (sock_owned_by_user(sk)) | |
193 | goto out; | |
194 | ||
195 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
196 | &hdr->daddr, &hdr->saddr, | |
197 | inet6_iif(skb)); | |
45329e71 | 198 | if (req == NULL) |
3df80d93 ACM |
199 | goto out; |
200 | ||
45329e71 ACM |
201 | /* |
202 | * ICMPs are not backlogged, hence we cannot get an established | |
203 | * socket here. | |
3df80d93 | 204 | */ |
547b792c | 205 | WARN_ON(req->sk != NULL); |
3df80d93 ACM |
206 | |
207 | if (seq != dccp_rsk(req)->dreq_iss) { | |
de0744af | 208 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
209 | goto out; |
210 | } | |
211 | ||
212 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
213 | goto out; | |
214 | ||
215 | case DCCP_REQUESTING: | |
216 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 217 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
218 | if (!sock_owned_by_user(sk)) { |
219 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
220 | sk->sk_err = err; | |
221 | /* | |
222 | * Wake people up to see the error | |
223 | * (see connect in sock.c) | |
224 | */ | |
225 | sk->sk_error_report(sk); | |
3df80d93 ACM |
226 | dccp_done(sk); |
227 | } else | |
228 | sk->sk_err_soft = err; | |
229 | goto out; | |
230 | } | |
231 | ||
232 | if (!sock_owned_by_user(sk) && np->recverr) { | |
233 | sk->sk_err = err; | |
234 | sk->sk_error_report(sk); | |
235 | } else | |
236 | sk->sk_err_soft = err; | |
237 | ||
238 | out: | |
239 | bh_unlock_sock(sk); | |
240 | sock_put(sk); | |
241 | } | |
242 | ||
243 | ||
fd80eb94 | 244 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 ACM |
245 | { |
246 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
247 | struct ipv6_pinfo *np = inet6_sk(sk); | |
248 | struct sk_buff *skb; | |
249 | struct ipv6_txoptions *opt = NULL; | |
250 | struct in6_addr *final_p = NULL, final; | |
251 | struct flowi fl; | |
252 | int err = -1; | |
fd80eb94 | 253 | struct dst_entry *dst; |
3df80d93 ACM |
254 | |
255 | memset(&fl, 0, sizeof(fl)); | |
256 | fl.proto = IPPROTO_DCCP; | |
257 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
258 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
259 | fl.fl6_flowlabel = 0; | |
260 | fl.oif = ireq6->iif; | |
261 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
944f7502 | 262 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
4237c75c | 263 | security_req_classify_flow(req, &fl); |
3df80d93 | 264 | |
fd80eb94 | 265 | opt = np->opt; |
3df80d93 | 266 | |
fd80eb94 DL |
267 | if (opt != NULL && opt->srcrt != NULL) { |
268 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
45329e71 | 269 | |
fd80eb94 DL |
270 | ipv6_addr_copy(&final, &fl.fl6_dst); |
271 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
272 | final_p = &final; | |
273 | } | |
3df80d93 | 274 | |
fd80eb94 DL |
275 | err = ip6_dst_lookup(sk, &dst, &fl); |
276 | if (err) | |
277 | goto done; | |
45329e71 | 278 | |
fd80eb94 DL |
279 | if (final_p) |
280 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 | 281 | |
52479b62 | 282 | err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0); |
fd80eb94 DL |
283 | if (err < 0) |
284 | goto done; | |
3df80d93 ACM |
285 | |
286 | skb = dccp_make_response(sk, dst, req); | |
287 | if (skb != NULL) { | |
288 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 289 | |
6f4e5fff GR |
290 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
291 | &ireq6->loc_addr, | |
292 | &ireq6->rmt_addr); | |
3df80d93 ACM |
293 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
294 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
b9df3cb8 | 295 | err = net_xmit_eval(err); |
3df80d93 ACM |
296 | } |
297 | ||
298 | done: | |
45329e71 | 299 | if (opt != NULL && opt != np->opt) |
3df80d93 | 300 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 301 | dst_release(dst); |
3df80d93 ACM |
302 | return err; |
303 | } | |
304 | ||
305 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
306 | { | |
d99a7bd2 | 307 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3df80d93 ACM |
308 | if (inet6_rsk(req)->pktopts != NULL) |
309 | kfree_skb(inet6_rsk(req)->pktopts); | |
310 | } | |
311 | ||
cfb6eeb4 | 312 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 313 | { |
0660e03f | 314 | struct ipv6hdr *rxip6h; |
3df80d93 ACM |
315 | struct sk_buff *skb; |
316 | struct flowi fl; | |
334527d3 PE |
317 | struct net *net = dev_net(rxskb->dst->dev); |
318 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; | |
3df80d93 | 319 | |
e356d37a | 320 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
321 | return; |
322 | ||
323 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 324 | return; |
3df80d93 | 325 | |
02047741 | 326 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 327 | if (skb == NULL) |
8109b02b | 328 | return; |
3df80d93 | 329 | |
0660e03f | 330 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
331 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
332 | &rxip6h->daddr); | |
6f4e5fff | 333 | |
3df80d93 | 334 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
335 | ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); |
336 | ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); | |
6f4e5fff | 337 | |
3df80d93 ACM |
338 | fl.proto = IPPROTO_DCCP; |
339 | fl.oif = inet6_iif(rxskb); | |
e356d37a GR |
340 | fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport; |
341 | fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport; | |
beb8d13b | 342 | security_skb_classify_flow(rxskb, &fl); |
3df80d93 ACM |
343 | |
344 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
02047741 | 345 | if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) { |
52479b62 | 346 | if (xfrm_lookup(net, &skb->dst, &fl, NULL, 0) >= 0) { |
02047741 | 347 | ip6_xmit(ctl_sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
348 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
349 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
350 | return; | |
351 | } | |
352 | } | |
353 | ||
354 | kfree_skb(skb); | |
355 | } | |
356 | ||
73c9e02c GR |
357 | static struct request_sock_ops dccp6_request_sock_ops = { |
358 | .family = AF_INET6, | |
359 | .obj_size = sizeof(struct dccp6_request_sock), | |
360 | .rtx_syn_ack = dccp_v6_send_response, | |
361 | .send_ack = dccp_reqsk_send_ack, | |
362 | .destructor = dccp_v6_reqsk_destructor, | |
363 | .send_reset = dccp_v6_ctl_send_reset, | |
364 | }; | |
365 | ||
3df80d93 ACM |
366 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
367 | { | |
368 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 369 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
370 | struct sock *nsk; |
371 | struct request_sock **prev; | |
372 | /* Find possible connection requests. */ | |
373 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
374 | dh->dccph_sport, | |
375 | &iph->saddr, | |
376 | &iph->daddr, | |
377 | inet6_iif(skb)); | |
378 | if (req != NULL) | |
379 | return dccp_check_req(sk, skb, req, prev); | |
380 | ||
671a1c74 | 381 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
382 | &iph->saddr, dh->dccph_sport, |
383 | &iph->daddr, ntohs(dh->dccph_dport), | |
384 | inet6_iif(skb)); | |
3df80d93 ACM |
385 | if (nsk != NULL) { |
386 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
387 | bh_lock_sock(nsk); | |
388 | return nsk; | |
389 | } | |
9469c7b4 | 390 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
391 | return NULL; |
392 | } | |
393 | ||
394 | return sk; | |
395 | } | |
396 | ||
397 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
398 | { | |
3df80d93 ACM |
399 | struct request_sock *req; |
400 | struct dccp_request_sock *dreq; | |
401 | struct inet6_request_sock *ireq6; | |
402 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 403 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 404 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
405 | |
406 | if (skb->protocol == htons(ETH_P_IP)) | |
407 | return dccp_v4_conn_request(sk, skb); | |
408 | ||
409 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 410 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
411 | |
412 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 413 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 414 | goto drop; |
8109b02b | 415 | } |
3df80d93 | 416 | /* |
45329e71 | 417 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 418 | */ |
4a5409a5 | 419 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 420 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 421 | goto drop; |
3df80d93 ACM |
422 | |
423 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
424 | goto drop; | |
425 | ||
82709531 | 426 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
427 | if (req == NULL) |
428 | goto drop; | |
429 | ||
ac75773c GR |
430 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
431 | goto drop_and_free; | |
3df80d93 | 432 | |
8b819412 GR |
433 | dreq = dccp_rsk(req); |
434 | if (dccp_parse_options(sk, dreq, skb)) | |
435 | goto drop_and_free; | |
436 | ||
4237c75c VY |
437 | if (security_inet_conn_request(sk, skb, req)) |
438 | goto drop_and_free; | |
439 | ||
3df80d93 | 440 | ireq6 = inet6_rsk(req); |
0660e03f ACM |
441 | ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); |
442 | ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); | |
3df80d93 ACM |
443 | |
444 | if (ipv6_opt_accepted(sk, skb) || | |
445 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
446 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
447 | atomic_inc(&skb->users); | |
448 | ireq6->pktopts = skb; | |
449 | } | |
450 | ireq6->iif = sk->sk_bound_dev_if; | |
451 | ||
452 | /* So that link locals have meaning */ | |
453 | if (!sk->sk_bound_dev_if && | |
454 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
455 | ireq6->iif = inet6_iif(skb); | |
456 | ||
45329e71 | 457 | /* |
3df80d93 ACM |
458 | * Step 3: Process LISTEN state |
459 | * | |
d83ca5ac | 460 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 461 | * |
d83ca5ac GR |
462 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
463 | * dccp_create_openreq_child. | |
3df80d93 | 464 | */ |
3df80d93 | 465 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 466 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
467 | dreq->dreq_service = service; |
468 | ||
fd80eb94 | 469 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
470 | goto drop_and_free; |
471 | ||
472 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
473 | return 0; | |
474 | ||
475 | drop_and_free: | |
476 | reqsk_free(req); | |
477 | drop: | |
478 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
479 | return -1; |
480 | } | |
481 | ||
482 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
483 | struct sk_buff *skb, | |
484 | struct request_sock *req, | |
485 | struct dst_entry *dst) | |
486 | { | |
487 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
488 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
489 | struct inet_sock *newinet; | |
490 | struct dccp_sock *newdp; | |
491 | struct dccp6_sock *newdp6; | |
492 | struct sock *newsk; | |
493 | struct ipv6_txoptions *opt; | |
494 | ||
495 | if (skb->protocol == htons(ETH_P_IP)) { | |
496 | /* | |
497 | * v6 mapped | |
498 | */ | |
3df80d93 | 499 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 500 | if (newsk == NULL) |
3df80d93 ACM |
501 | return NULL; |
502 | ||
503 | newdp6 = (struct dccp6_sock *)newsk; | |
504 | newdp = dccp_sk(newsk); | |
505 | newinet = inet_sk(newsk); | |
506 | newinet->pinet6 = &newdp6->inet6; | |
507 | newnp = inet6_sk(newsk); | |
508 | ||
509 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
510 | ||
511 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
512 | newinet->daddr); | |
513 | ||
514 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
515 | newinet->saddr); | |
516 | ||
517 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
518 | ||
519 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
520 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
521 | newnp->pktoptions = NULL; | |
522 | newnp->opt = NULL; | |
523 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 524 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
525 | |
526 | /* | |
527 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
528 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
529 | * that function for the gory details. -acme | |
530 | */ | |
531 | ||
532 | /* It is tricky place. Until this moment IPv4 tcp | |
533 | worked with IPv6 icsk.icsk_af_ops. | |
534 | Sync it now. | |
535 | */ | |
d83d8461 | 536 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
537 | |
538 | return newsk; | |
539 | } | |
540 | ||
541 | opt = np->opt; | |
542 | ||
543 | if (sk_acceptq_is_full(sk)) | |
544 | goto out_overflow; | |
545 | ||
3df80d93 ACM |
546 | if (dst == NULL) { |
547 | struct in6_addr *final_p = NULL, final; | |
548 | struct flowi fl; | |
549 | ||
550 | memset(&fl, 0, sizeof(fl)); | |
551 | fl.proto = IPPROTO_DCCP; | |
552 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
553 | if (opt != NULL && opt->srcrt != NULL) { |
554 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
555 | ||
3df80d93 ACM |
556 | ipv6_addr_copy(&final, &fl.fl6_dst); |
557 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
558 | final_p = &final; | |
559 | } | |
560 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
561 | fl.oif = sk->sk_bound_dev_if; | |
562 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
944f7502 | 563 | fl.fl_ip_sport = inet_rsk(req)->loc_port; |
beb8d13b | 564 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
565 | |
566 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
567 | goto out; | |
568 | ||
569 | if (final_p) | |
570 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
571 | ||
52479b62 | 572 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) |
3df80d93 | 573 | goto out; |
45329e71 | 574 | } |
3df80d93 ACM |
575 | |
576 | newsk = dccp_create_openreq_child(sk, req, skb); | |
577 | if (newsk == NULL) | |
578 | goto out; | |
579 | ||
580 | /* | |
581 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
582 | * count here, dccp_create_openreq_child now does this for us, see the | |
583 | * comment in that function for the gory details. -acme | |
584 | */ | |
585 | ||
8e1ef0a9 | 586 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
587 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
588 | NETIF_F_TSO); | |
3df80d93 ACM |
589 | newdp6 = (struct dccp6_sock *)newsk; |
590 | newinet = inet_sk(newsk); | |
591 | newinet->pinet6 = &newdp6->inet6; | |
592 | newdp = dccp_sk(newsk); | |
593 | newnp = inet6_sk(newsk); | |
594 | ||
595 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
596 | ||
597 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
598 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
599 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
600 | newsk->sk_bound_dev_if = ireq6->iif; | |
601 | ||
45329e71 | 602 | /* Now IPv6 options... |
3df80d93 ACM |
603 | |
604 | First: no IPv4 options. | |
605 | */ | |
606 | newinet->opt = NULL; | |
607 | ||
608 | /* Clone RX bits */ | |
609 | newnp->rxopt.all = np->rxopt.all; | |
610 | ||
611 | /* Clone pktoptions received with SYN */ | |
612 | newnp->pktoptions = NULL; | |
613 | if (ireq6->pktopts != NULL) { | |
614 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
615 | kfree_skb(ireq6->pktopts); | |
616 | ireq6->pktopts = NULL; | |
617 | if (newnp->pktoptions) | |
618 | skb_set_owner_r(newnp->pktoptions, newsk); | |
619 | } | |
620 | newnp->opt = NULL; | |
621 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 622 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 623 | |
45329e71 ACM |
624 | /* |
625 | * Clone native IPv6 options from listening socket (if any) | |
626 | * | |
627 | * Yes, keeping reference count would be much more clever, but we make | |
628 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 629 | */ |
45329e71 | 630 | if (opt != NULL) { |
3df80d93 ACM |
631 | newnp->opt = ipv6_dup_options(newsk, opt); |
632 | if (opt != np->opt) | |
633 | sock_kfree_s(sk, opt, opt->tot_len); | |
634 | } | |
635 | ||
d83d8461 | 636 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 637 | if (newnp->opt != NULL) |
d83d8461 ACM |
638 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
639 | newnp->opt->opt_flen); | |
3df80d93 ACM |
640 | |
641 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
642 | ||
643 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
644 | ||
ab1e0a13 | 645 | __inet6_hash(newsk); |
e56d8b8a | 646 | __inet_inherit_port(sk, newsk); |
3df80d93 ACM |
647 | |
648 | return newsk; | |
649 | ||
650 | out_overflow: | |
de0744af | 651 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
3df80d93 | 652 | out: |
de0744af | 653 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
45329e71 | 654 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
655 | sock_kfree_s(sk, opt, opt->tot_len); |
656 | dst_release(dst); | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | /* The socket must have it's spinlock held when we get | |
661 | * here. | |
662 | * | |
663 | * We have a potential double-lock case here, so even when | |
664 | * doing backlog processing we use the BH locking scheme. | |
665 | * This is because we cannot sleep with the original spinlock | |
666 | * held. | |
667 | */ | |
668 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
669 | { | |
670 | struct ipv6_pinfo *np = inet6_sk(sk); | |
671 | struct sk_buff *opt_skb = NULL; | |
672 | ||
673 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
674 | goes to IPv4 receive handler and backlogged. | |
675 | From backlog it always goes here. Kerboom... | |
676 | Fortunately, dccp_rcv_established and rcv_established | |
677 | handle them correctly, but it is not case with | |
678 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
679 | */ | |
680 | ||
681 | if (skb->protocol == htons(ETH_P_IP)) | |
682 | return dccp_v4_do_rcv(sk, skb); | |
683 | ||
fda9ef5d | 684 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
685 | goto discard; |
686 | ||
687 | /* | |
45329e71 ACM |
688 | * socket locking is here for SMP purposes as backlog rcv is currently |
689 | * called with bh processing disabled. | |
3df80d93 ACM |
690 | */ |
691 | ||
692 | /* Do Stevens' IPV6_PKTOPTIONS. | |
693 | ||
694 | Yes, guys, it is the only place in our code, where we | |
695 | may make it not affecting IPv4. | |
696 | The rest of code is protocol independent, | |
697 | and I do not like idea to uglify IPv4. | |
698 | ||
699 | Actually, all the idea behind IPV6_PKTOPTIONS | |
700 | looks not very well thought. For now we latch | |
701 | options, received in the last packet, enqueued | |
702 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 703 | --ANK (980728) |
3df80d93 ACM |
704 | */ |
705 | if (np->rxopt.all) | |
89e7e577 GR |
706 | /* |
707 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
708 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
709 | */ | |
3df80d93 ACM |
710 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
711 | ||
712 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
713 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
714 | goto reset; | |
fd169f15 | 715 | if (opt_skb) { |
89e7e577 | 716 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
717 | __kfree_skb(opt_skb); |
718 | } | |
3df80d93 ACM |
719 | return 0; |
720 | } | |
721 | ||
d83ca5ac GR |
722 | /* |
723 | * Step 3: Process LISTEN state | |
724 | * If S.state == LISTEN, | |
725 | * If P.type == Request or P contains a valid Init Cookie option, | |
726 | * (* Must scan the packet's options to check for Init | |
727 | * Cookies. Only Init Cookies are processed here, | |
728 | * however; other options are processed in Step 8. This | |
729 | * scan need only be performed if the endpoint uses Init | |
730 | * Cookies *) | |
731 | * (* Generate a new socket and switch to that socket *) | |
732 | * Set S := new socket for this port pair | |
733 | * S.state = RESPOND | |
734 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
735 | * Initialize S.GAR := S.ISS | |
736 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
737 | * Continue with S.state == RESPOND | |
738 | * (* A Response packet will be generated in Step 11 *) | |
739 | * Otherwise, | |
740 | * Generate Reset(No Connection) unless P.type == Reset | |
741 | * Drop packet and return | |
742 | * | |
743 | * NOTE: the check for the packet types is done in | |
744 | * dccp_rcv_state_process | |
745 | */ | |
45329e71 | 746 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 747 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 748 | |
45329e71 ACM |
749 | if (nsk == NULL) |
750 | goto discard; | |
3df80d93 ACM |
751 | /* |
752 | * Queue it on the new socket if the new socket is active, | |
753 | * otherwise we just shortcircuit this and continue with | |
754 | * the new socket.. | |
755 | */ | |
8109b02b | 756 | if (nsk != sk) { |
3df80d93 ACM |
757 | if (dccp_child_process(sk, nsk, skb)) |
758 | goto reset; | |
45329e71 | 759 | if (opt_skb != NULL) |
3df80d93 ACM |
760 | __kfree_skb(opt_skb); |
761 | return 0; | |
762 | } | |
763 | } | |
764 | ||
765 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
766 | goto reset; | |
fd169f15 | 767 | if (opt_skb) { |
89e7e577 | 768 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
769 | __kfree_skb(opt_skb); |
770 | } | |
3df80d93 ACM |
771 | return 0; |
772 | ||
773 | reset: | |
cfb6eeb4 | 774 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 775 | discard: |
45329e71 | 776 | if (opt_skb != NULL) |
3df80d93 ACM |
777 | __kfree_skb(opt_skb); |
778 | kfree_skb(skb); | |
779 | return 0; | |
780 | } | |
781 | ||
e5bbef20 | 782 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
783 | { |
784 | const struct dccp_hdr *dh; | |
3df80d93 | 785 | struct sock *sk; |
6f4e5fff | 786 | int min_cov; |
3df80d93 | 787 | |
6f4e5fff | 788 | /* Step 1: Check header basics */ |
3df80d93 ACM |
789 | |
790 | if (dccp_invalid_packet(skb)) | |
791 | goto discard_it; | |
792 | ||
6f4e5fff | 793 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
794 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
795 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 796 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
797 | goto discard_it; |
798 | } | |
799 | ||
3df80d93 ACM |
800 | dh = dccp_hdr(skb); |
801 | ||
fde20105 | 802 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
803 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
804 | ||
805 | if (dccp_packet_without_ack(skb)) | |
806 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
807 | else | |
808 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
809 | ||
810 | /* Step 2: | |
8109b02b | 811 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
812 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
813 | dh->dccph_sport, dh->dccph_dport); | |
45329e71 | 814 | /* |
3df80d93 | 815 | * Step 2: |
8109b02b | 816 | * If no socket ... |
3df80d93 | 817 | */ |
d23c7107 GR |
818 | if (sk == NULL) { |
819 | dccp_pr_debug("failed to look up flow ID in table and " | |
820 | "get corresponding socket\n"); | |
3df80d93 | 821 | goto no_dccp_socket; |
d23c7107 | 822 | } |
3df80d93 | 823 | |
45329e71 | 824 | /* |
3df80d93 | 825 | * Step 2: |
8109b02b | 826 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
827 | * Generate Reset(No Connection) unless P.type == Reset |
828 | * Drop packet and return | |
829 | */ | |
d23c7107 GR |
830 | if (sk->sk_state == DCCP_TIME_WAIT) { |
831 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
832 | inet_twsk_put(inet_twsk(sk)); | |
833 | goto no_dccp_socket; | |
834 | } | |
3df80d93 | 835 | |
6f4e5fff GR |
836 | /* |
837 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
838 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
839 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
840 | */ |
841 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
842 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
843 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
844 | dh->dccph_cscov, min_cov); | |
845 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
846 | goto discard_and_relse; | |
847 | } | |
848 | ||
3df80d93 ACM |
849 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
850 | goto discard_and_relse; | |
851 | ||
58a5a7b9 | 852 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
853 | |
854 | no_dccp_socket: | |
855 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
856 | goto discard_it; | |
857 | /* | |
858 | * Step 2: | |
8109b02b | 859 | * If no socket ... |
3df80d93 ACM |
860 | * Generate Reset(No Connection) unless P.type == Reset |
861 | * Drop packet and return | |
862 | */ | |
863 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
864 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
865 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 866 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 867 | } |
3df80d93 | 868 | |
d23c7107 | 869 | discard_it: |
3df80d93 ACM |
870 | kfree_skb(skb); |
871 | return 0; | |
872 | ||
873 | discard_and_relse: | |
874 | sock_put(sk); | |
875 | goto discard_it; | |
3df80d93 ACM |
876 | } |
877 | ||
73c9e02c GR |
878 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
879 | int addr_len) | |
880 | { | |
881 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
882 | struct inet_connection_sock *icsk = inet_csk(sk); | |
883 | struct inet_sock *inet = inet_sk(sk); | |
884 | struct ipv6_pinfo *np = inet6_sk(sk); | |
885 | struct dccp_sock *dp = dccp_sk(sk); | |
886 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
887 | struct flowi fl; | |
888 | struct dst_entry *dst; | |
889 | int addr_type; | |
890 | int err; | |
891 | ||
892 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
893 | ||
894 | if (addr_len < SIN6_LEN_RFC2133) | |
895 | return -EINVAL; | |
896 | ||
897 | if (usin->sin6_family != AF_INET6) | |
898 | return -EAFNOSUPPORT; | |
899 | ||
900 | memset(&fl, 0, sizeof(fl)); | |
901 | ||
902 | if (np->sndflow) { | |
903 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
904 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
905 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
906 | struct ip6_flowlabel *flowlabel; | |
907 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
908 | if (flowlabel == NULL) | |
909 | return -EINVAL; | |
910 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
911 | fl6_sock_release(flowlabel); | |
912 | } | |
913 | } | |
914 | /* | |
915 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
916 | */ | |
917 | if (ipv6_addr_any(&usin->sin6_addr)) | |
918 | usin->sin6_addr.s6_addr[15] = 1; | |
919 | ||
920 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
921 | ||
922 | if (addr_type & IPV6_ADDR_MULTICAST) | |
923 | return -ENETUNREACH; | |
924 | ||
925 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
926 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
927 | usin->sin6_scope_id) { | |
928 | /* If interface is set while binding, indices | |
929 | * must coincide. | |
930 | */ | |
931 | if (sk->sk_bound_dev_if && | |
932 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
933 | return -EINVAL; | |
934 | ||
935 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
936 | } | |
937 | ||
938 | /* Connect to link-local address requires an interface */ | |
939 | if (!sk->sk_bound_dev_if) | |
940 | return -EINVAL; | |
941 | } | |
942 | ||
943 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
944 | np->flow_label = fl.fl6_flowlabel; | |
945 | ||
946 | /* | |
947 | * DCCP over IPv4 | |
948 | */ | |
949 | if (addr_type == IPV6_ADDR_MAPPED) { | |
950 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
951 | struct sockaddr_in sin; | |
952 | ||
953 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
954 | ||
955 | if (__ipv6_only_sock(sk)) | |
956 | return -ENETUNREACH; | |
957 | ||
958 | sin.sin_family = AF_INET; | |
959 | sin.sin_port = usin->sin6_port; | |
960 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
961 | ||
962 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
963 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
964 | ||
965 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
966 | if (err) { | |
967 | icsk->icsk_ext_hdr_len = exthdrlen; | |
968 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
969 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
970 | goto failure; | |
971 | } else { | |
972 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
973 | inet->saddr); | |
974 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
975 | inet->rcv_saddr); | |
976 | } | |
977 | ||
978 | return err; | |
979 | } | |
980 | ||
981 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
982 | saddr = &np->rcv_saddr; | |
983 | ||
984 | fl.proto = IPPROTO_DCCP; | |
985 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
986 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
987 | fl.oif = sk->sk_bound_dev_if; | |
988 | fl.fl_ip_dport = usin->sin6_port; | |
989 | fl.fl_ip_sport = inet->sport; | |
990 | security_sk_classify_flow(sk, &fl); | |
991 | ||
992 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
993 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
994 | ||
995 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
996 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
997 | final_p = &final; | |
998 | } | |
999 | ||
1000 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1001 | if (err) | |
1002 | goto failure; | |
1003 | ||
1004 | if (final_p) | |
1005 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1006 | ||
52479b62 | 1007 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
14e50e57 DM |
1008 | if (err < 0) { |
1009 | if (err == -EREMOTE) | |
1010 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
1011 | if (err < 0) | |
1012 | goto failure; | |
1013 | } | |
73c9e02c GR |
1014 | |
1015 | if (saddr == NULL) { | |
1016 | saddr = &fl.fl6_src; | |
1017 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1018 | } | |
1019 | ||
1020 | /* set the source address */ | |
1021 | ipv6_addr_copy(&np->saddr, saddr); | |
1022 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1023 | ||
1024 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1025 | ||
1026 | icsk->icsk_ext_hdr_len = 0; | |
1027 | if (np->opt != NULL) | |
1028 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1029 | np->opt->opt_nflen); | |
1030 | ||
1031 | inet->dport = usin->sin6_port; | |
1032 | ||
1033 | dccp_set_state(sk, DCCP_REQUESTING); | |
1034 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1035 | if (err) | |
1036 | goto late_failure; | |
d7f7365f GR |
1037 | |
1038 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1039 | np->daddr.s6_addr32, | |
1040 | inet->sport, inet->dport); | |
73c9e02c GR |
1041 | err = dccp_connect(sk); |
1042 | if (err) | |
1043 | goto late_failure; | |
1044 | ||
1045 | return 0; | |
1046 | ||
1047 | late_failure: | |
1048 | dccp_set_state(sk, DCCP_CLOSED); | |
1049 | __sk_dst_reset(sk); | |
1050 | failure: | |
1051 | inet->dport = 0; | |
1052 | sk->sk_route_caps = 0; | |
1053 | return err; | |
1054 | } | |
1055 | ||
3df80d93 | 1056 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1057 | .queue_xmit = inet6_csk_xmit, |
1058 | .send_check = dccp_v6_send_check, | |
1059 | .rebuild_header = inet6_sk_rebuild_header, | |
1060 | .conn_request = dccp_v6_conn_request, | |
1061 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1062 | .net_header_len = sizeof(struct ipv6hdr), | |
1063 | .setsockopt = ipv6_setsockopt, | |
1064 | .getsockopt = ipv6_getsockopt, | |
1065 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1066 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1067 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1068 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1069 | .compat_setsockopt = compat_ipv6_setsockopt, |
1070 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1071 | #endif |
3df80d93 ACM |
1072 | }; |
1073 | ||
1074 | /* | |
1075 | * DCCP over IPv4 via INET6 API | |
1076 | */ | |
1077 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1078 | .queue_xmit = ip_queue_xmit, |
1079 | .send_check = dccp_v4_send_check, | |
1080 | .rebuild_header = inet_sk_rebuild_header, | |
1081 | .conn_request = dccp_v6_conn_request, | |
1082 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1083 | .net_header_len = sizeof(struct iphdr), | |
1084 | .setsockopt = ipv6_setsockopt, | |
1085 | .getsockopt = ipv6_getsockopt, | |
1086 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1087 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1088 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1089 | .compat_setsockopt = compat_ipv6_setsockopt, |
1090 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1091 | #endif |
3df80d93 ACM |
1092 | }; |
1093 | ||
1094 | /* NOTE: A lot of things set to zero explicitly by call to | |
1095 | * sk_alloc() so need not be done here. | |
1096 | */ | |
1097 | static int dccp_v6_init_sock(struct sock *sk) | |
1098 | { | |
72478873 ACM |
1099 | static __u8 dccp_v6_ctl_sock_initialized; |
1100 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1101 | |
72478873 ACM |
1102 | if (err == 0) { |
1103 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1104 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1105 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1106 | } |
3df80d93 ACM |
1107 | |
1108 | return err; | |
1109 | } | |
1110 | ||
7d06b2e0 | 1111 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1112 | { |
3e0fadc5 | 1113 | dccp_destroy_sock(sk); |
7d06b2e0 | 1114 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1115 | } |
1116 | ||
73c9e02c GR |
1117 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1118 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1119 | }; | |
1120 | ||
3df80d93 | 1121 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1122 | .name = "DCCPv6", |
1123 | .owner = THIS_MODULE, | |
1124 | .close = dccp_close, | |
1125 | .connect = dccp_v6_connect, | |
1126 | .disconnect = dccp_disconnect, | |
1127 | .ioctl = dccp_ioctl, | |
1128 | .init = dccp_v6_init_sock, | |
1129 | .setsockopt = dccp_setsockopt, | |
1130 | .getsockopt = dccp_getsockopt, | |
1131 | .sendmsg = dccp_sendmsg, | |
1132 | .recvmsg = dccp_recvmsg, | |
1133 | .backlog_rcv = dccp_v6_do_rcv, | |
1134 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1135 | .unhash = inet_unhash, |
543d9cfe | 1136 | .accept = inet_csk_accept, |
ab1e0a13 | 1137 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1138 | .shutdown = dccp_shutdown, |
1139 | .destroy = dccp_v6_destroy_sock, | |
1140 | .orphan_count = &dccp_orphan_count, | |
1141 | .max_header = MAX_DCCP_HEADER, | |
1142 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1143 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1144 | .rsk_prot = &dccp6_request_sock_ops, |
1145 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1146 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1147 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1148 | .compat_setsockopt = compat_dccp_setsockopt, |
1149 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1150 | #endif |
3df80d93 ACM |
1151 | }; |
1152 | ||
1153 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1154 | .handler = dccp_v6_rcv, |
1155 | .err_handler = dccp_v6_err, | |
1156 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1157 | }; |
1158 | ||
1159 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1160 | .family = PF_INET6, |
1161 | .owner = THIS_MODULE, | |
1162 | .release = inet6_release, | |
1163 | .bind = inet6_bind, | |
1164 | .connect = inet_stream_connect, | |
1165 | .socketpair = sock_no_socketpair, | |
1166 | .accept = inet_accept, | |
1167 | .getname = inet6_getname, | |
1168 | .poll = dccp_poll, | |
1169 | .ioctl = inet6_ioctl, | |
1170 | .listen = inet_dccp_listen, | |
1171 | .shutdown = inet_shutdown, | |
1172 | .setsockopt = sock_common_setsockopt, | |
1173 | .getsockopt = sock_common_getsockopt, | |
1174 | .sendmsg = inet_sendmsg, | |
1175 | .recvmsg = sock_common_recvmsg, | |
1176 | .mmap = sock_no_mmap, | |
1177 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1178 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1179 | .compat_setsockopt = compat_sock_common_setsockopt, |
1180 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1181 | #endif |
3df80d93 ACM |
1182 | }; |
1183 | ||
1184 | static struct inet_protosw dccp_v6_protosw = { | |
1185 | .type = SOCK_DCCP, | |
1186 | .protocol = IPPROTO_DCCP, | |
1187 | .prot = &dccp_v6_prot, | |
1188 | .ops = &inet6_dccp_ops, | |
1189 | .capability = -1, | |
d83d8461 | 1190 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1191 | }; |
1192 | ||
8231bd27 PE |
1193 | static int dccp_v6_init_net(struct net *net) |
1194 | { | |
334527d3 PE |
1195 | int err; |
1196 | ||
1197 | err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, | |
1198 | SOCK_DCCP, IPPROTO_DCCP, net); | |
1199 | return err; | |
8231bd27 PE |
1200 | } |
1201 | ||
1202 | static void dccp_v6_exit_net(struct net *net) | |
1203 | { | |
334527d3 | 1204 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1205 | } |
1206 | ||
1207 | static struct pernet_operations dccp_v6_ops = { | |
1208 | .init = dccp_v6_init_net, | |
1209 | .exit = dccp_v6_exit_net, | |
1210 | }; | |
1211 | ||
3df80d93 ACM |
1212 | static int __init dccp_v6_init(void) |
1213 | { | |
1214 | int err = proto_register(&dccp_v6_prot, 1); | |
1215 | ||
1216 | if (err != 0) | |
1217 | goto out; | |
1218 | ||
1219 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1220 | if (err != 0) | |
1221 | goto out_unregister_proto; | |
1222 | ||
1223 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1224 | |
8231bd27 PE |
1225 | err = register_pernet_subsys(&dccp_v6_ops); |
1226 | if (err != 0) | |
1227 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1228 | out: |
1229 | return err; | |
8231bd27 PE |
1230 | |
1231 | out_destroy_ctl_sock: | |
72478873 ACM |
1232 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1233 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1234 | out_unregister_proto: |
1235 | proto_unregister(&dccp_v6_prot); | |
1236 | goto out; | |
1237 | } | |
1238 | ||
1239 | static void __exit dccp_v6_exit(void) | |
1240 | { | |
8231bd27 | 1241 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1242 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1243 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1244 | proto_unregister(&dccp_v6_prot); | |
1245 | } | |
1246 | ||
1247 | module_init(dccp_v6_init); | |
1248 | module_exit(dccp_v6_exit); | |
1249 | ||
1250 | /* | |
1251 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1252 | * values directly, Also cover the case where the protocol is not specified, | |
1253 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1254 | */ | |
7131c6c7 JD |
1255 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1256 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1257 | MODULE_LICENSE("GPL"); |
1258 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1259 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |