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Commit | Line | Data |
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3df80d93 ACM |
1 | /* |
2 | * DCCP over IPv6 | |
45329e71 | 3 | * Linux INET6 implementation |
3df80d93 ACM |
4 | * |
5 | * Based on net/dccp6/ipv6.c | |
6 | * | |
7 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
3df80d93 ACM |
15 | #include <linux/module.h> |
16 | #include <linux/random.h> | |
17 | #include <linux/xfrm.h> | |
18 | ||
19 | #include <net/addrconf.h> | |
20 | #include <net/inet_common.h> | |
21 | #include <net/inet_hashtables.h> | |
14c85021 | 22 | #include <net/inet_sock.h> |
3df80d93 ACM |
23 | #include <net/inet6_connection_sock.h> |
24 | #include <net/inet6_hashtables.h> | |
25 | #include <net/ip6_route.h> | |
26 | #include <net/ipv6.h> | |
27 | #include <net/protocol.h> | |
28 | #include <net/transp_v6.h> | |
aa0e4e4a | 29 | #include <net/ip6_checksum.h> |
3df80d93 ACM |
30 | #include <net/xfrm.h> |
31 | ||
32 | #include "dccp.h" | |
33 | #include "ipv6.h" | |
4b79f0af | 34 | #include "feat.h" |
3df80d93 | 35 | |
72478873 ACM |
36 | /* Socket used for sending RSTs and ACKs */ |
37 | static struct socket *dccp_v6_ctl_socket; | |
38 | ||
3df80d93 ACM |
39 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
40 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
41 | ||
42 | static int dccp_v6_get_port(struct sock *sk, unsigned short snum) | |
43 | { | |
44 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, | |
45 | inet6_csk_bind_conflict); | |
46 | } | |
47 | ||
48 | static void dccp_v6_hash(struct sock *sk) | |
49 | { | |
50 | if (sk->sk_state != DCCP_CLOSED) { | |
51 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
c985ed70 | 52 | dccp_hash(sk); |
3df80d93 ACM |
53 | return; |
54 | } | |
55 | local_bh_disable(); | |
56 | __inet6_hash(&dccp_hashinfo, sk); | |
57 | local_bh_enable(); | |
58 | } | |
59 | } | |
60 | ||
6f4e5fff | 61 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 62 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
63 | struct in6_addr *saddr, |
64 | struct in6_addr *daddr) | |
3df80d93 | 65 | { |
6f4e5fff GR |
66 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
67 | } | |
68 | ||
69 | static inline void dccp_v6_send_check(struct sock *sk, int unused_value, | |
70 | struct sk_buff *skb) | |
71 | { | |
72 | struct ipv6_pinfo *np = inet6_sk(sk); | |
73 | struct dccp_hdr *dh = dccp_hdr(skb); | |
74 | ||
75 | dccp_csum_outgoing(skb); | |
76 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr); | |
3df80d93 ACM |
77 | } |
78 | ||
7d533f94 | 79 | static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr, |
8109b02b | 80 | __be16 sport, __be16 dport ) |
3df80d93 | 81 | { |
d7f7365f GR |
82 | return secure_tcpv6_sequence_number(saddr, daddr, sport, dport); |
83 | } | |
84 | ||
85 | static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb) | |
86 | { | |
0660e03f ACM |
87 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
88 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
89 | dccp_hdr(skb)->dccph_dport, |
90 | dccp_hdr(skb)->dccph_sport ); | |
91 | ||
3df80d93 ACM |
92 | } |
93 | ||
3df80d93 | 94 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
60fe62e7 | 95 | int type, int code, int offset, __be32 info) |
3df80d93 ACM |
96 | { |
97 | struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data; | |
98 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
99 | struct ipv6_pinfo *np; | |
100 | struct sock *sk; | |
101 | int err; | |
102 | __u64 seq; | |
103 | ||
104 | sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport, | |
f2776ff0 | 105 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
106 | |
107 | if (sk == NULL) { | |
108 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); | |
109 | return; | |
110 | } | |
111 | ||
112 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 113 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
114 | return; |
115 | } | |
116 | ||
117 | bh_lock_sock(sk); | |
118 | if (sock_owned_by_user(sk)) | |
119 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
120 | ||
121 | if (sk->sk_state == DCCP_CLOSED) | |
122 | goto out; | |
123 | ||
124 | np = inet6_sk(sk); | |
125 | ||
126 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
127 | struct dst_entry *dst = NULL; |
128 | ||
129 | if (sock_owned_by_user(sk)) | |
130 | goto out; | |
131 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
132 | goto out; | |
133 | ||
134 | /* icmp should have updated the destination cache entry */ | |
135 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
136 | if (dst == NULL) { |
137 | struct inet_sock *inet = inet_sk(sk); | |
138 | struct flowi fl; | |
139 | ||
140 | /* BUGGG_FUTURE: Again, it is not clear how | |
141 | to handle rthdr case. Ignore this complexity | |
142 | for now. | |
143 | */ | |
144 | memset(&fl, 0, sizeof(fl)); | |
145 | fl.proto = IPPROTO_DCCP; | |
146 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
147 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
148 | fl.oif = sk->sk_bound_dev_if; | |
149 | fl.fl_ip_dport = inet->dport; | |
150 | fl.fl_ip_sport = inet->sport; | |
beb8d13b | 151 | security_sk_classify_flow(sk, &fl); |
3df80d93 | 152 | |
45329e71 ACM |
153 | err = ip6_dst_lookup(sk, &dst, &fl); |
154 | if (err) { | |
3df80d93 ACM |
155 | sk->sk_err_soft = -err; |
156 | goto out; | |
157 | } | |
158 | ||
45329e71 ACM |
159 | err = xfrm_lookup(&dst, &fl, sk, 0); |
160 | if (err < 0) { | |
3df80d93 ACM |
161 | sk->sk_err_soft = -err; |
162 | goto out; | |
163 | } | |
3df80d93 ACM |
164 | } else |
165 | dst_hold(dst); | |
166 | ||
d83d8461 | 167 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
168 | dccp_sync_mss(sk, dst_mtu(dst)); |
169 | } /* else let the usual retransmit timer handle it */ | |
170 | dst_release(dst); | |
171 | goto out; | |
172 | } | |
173 | ||
174 | icmpv6_err_convert(type, code, &err); | |
175 | ||
176 | seq = DCCP_SKB_CB(skb)->dccpd_seq; | |
177 | /* Might be for an request_sock */ | |
178 | switch (sk->sk_state) { | |
179 | struct request_sock *req, **prev; | |
180 | case DCCP_LISTEN: | |
181 | if (sock_owned_by_user(sk)) | |
182 | goto out; | |
183 | ||
184 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
185 | &hdr->daddr, &hdr->saddr, | |
186 | inet6_iif(skb)); | |
45329e71 | 187 | if (req == NULL) |
3df80d93 ACM |
188 | goto out; |
189 | ||
45329e71 ACM |
190 | /* |
191 | * ICMPs are not backlogged, hence we cannot get an established | |
192 | * socket here. | |
3df80d93 ACM |
193 | */ |
194 | BUG_TRAP(req->sk == NULL); | |
195 | ||
196 | if (seq != dccp_rsk(req)->dreq_iss) { | |
197 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
198 | goto out; | |
199 | } | |
200 | ||
201 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
202 | goto out; | |
203 | ||
204 | case DCCP_REQUESTING: | |
205 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 206 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
207 | if (!sock_owned_by_user(sk)) { |
208 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
209 | sk->sk_err = err; | |
210 | /* | |
211 | * Wake people up to see the error | |
212 | * (see connect in sock.c) | |
213 | */ | |
214 | sk->sk_error_report(sk); | |
3df80d93 ACM |
215 | dccp_done(sk); |
216 | } else | |
217 | sk->sk_err_soft = err; | |
218 | goto out; | |
219 | } | |
220 | ||
221 | if (!sock_owned_by_user(sk) && np->recverr) { | |
222 | sk->sk_err = err; | |
223 | sk->sk_error_report(sk); | |
224 | } else | |
225 | sk->sk_err_soft = err; | |
226 | ||
227 | out: | |
228 | bh_unlock_sock(sk); | |
229 | sock_put(sk); | |
230 | } | |
231 | ||
232 | ||
233 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, | |
234 | struct dst_entry *dst) | |
235 | { | |
236 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
237 | struct ipv6_pinfo *np = inet6_sk(sk); | |
238 | struct sk_buff *skb; | |
239 | struct ipv6_txoptions *opt = NULL; | |
240 | struct in6_addr *final_p = NULL, final; | |
241 | struct flowi fl; | |
242 | int err = -1; | |
243 | ||
244 | memset(&fl, 0, sizeof(fl)); | |
245 | fl.proto = IPPROTO_DCCP; | |
246 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
247 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
248 | fl.fl6_flowlabel = 0; | |
249 | fl.oif = ireq6->iif; | |
250 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
251 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
4237c75c | 252 | security_req_classify_flow(req, &fl); |
3df80d93 ACM |
253 | |
254 | if (dst == NULL) { | |
255 | opt = np->opt; | |
3df80d93 | 256 | |
45329e71 ACM |
257 | if (opt != NULL && opt->srcrt != NULL) { |
258 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
259 | ||
3df80d93 ACM |
260 | ipv6_addr_copy(&final, &fl.fl6_dst); |
261 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
262 | final_p = &final; | |
263 | } | |
264 | ||
265 | err = ip6_dst_lookup(sk, &dst, &fl); | |
266 | if (err) | |
267 | goto done; | |
45329e71 | 268 | |
3df80d93 ACM |
269 | if (final_p) |
270 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 ACM |
271 | |
272 | err = xfrm_lookup(&dst, &fl, sk, 0); | |
273 | if (err < 0) | |
3df80d93 ACM |
274 | goto done; |
275 | } | |
276 | ||
277 | skb = dccp_make_response(sk, dst, req); | |
278 | if (skb != NULL) { | |
279 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 280 | |
6f4e5fff GR |
281 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
282 | &ireq6->loc_addr, | |
283 | &ireq6->rmt_addr); | |
3df80d93 ACM |
284 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
285 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
b9df3cb8 | 286 | err = net_xmit_eval(err); |
3df80d93 ACM |
287 | } |
288 | ||
289 | done: | |
45329e71 | 290 | if (opt != NULL && opt != np->opt) |
3df80d93 | 291 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 292 | dst_release(dst); |
3df80d93 ACM |
293 | return err; |
294 | } | |
295 | ||
296 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
297 | { | |
298 | if (inet6_rsk(req)->pktopts != NULL) | |
299 | kfree_skb(inet6_rsk(req)->pktopts); | |
300 | } | |
301 | ||
cfb6eeb4 | 302 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 303 | { |
45329e71 | 304 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; |
0660e03f | 305 | struct ipv6hdr *rxip6h; |
118b2c95 | 306 | const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) + |
3df80d93 ACM |
307 | sizeof(struct dccp_hdr_ext) + |
308 | sizeof(struct dccp_hdr_reset); | |
309 | struct sk_buff *skb; | |
310 | struct flowi fl; | |
09dbc389 | 311 | u64 seqno = 0; |
3df80d93 ACM |
312 | |
313 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
314 | return; | |
315 | ||
316 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 317 | return; |
3df80d93 | 318 | |
118b2c95 ACM |
319 | skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
320 | GFP_ATOMIC); | |
45329e71 | 321 | if (skb == NULL) |
8109b02b | 322 | return; |
3df80d93 | 323 | |
118b2c95 | 324 | skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
3df80d93 | 325 | |
9b42078e | 326 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
3df80d93 ACM |
327 | |
328 | /* Swap the send and the receive. */ | |
329 | dh->dccph_type = DCCP_PKT_RESET; | |
330 | dh->dccph_sport = rxdh->dccph_dport; | |
331 | dh->dccph_dport = rxdh->dccph_sport; | |
332 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
333 | dh->dccph_x = 1; | |
334 | dccp_hdr_reset(skb)->dccph_reset_code = | |
335 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
336 | ||
0e64e94e | 337 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
3df80d93 | 338 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) |
9bf55cda | 339 | seqno = ADD48(DCCP_SKB_CB(rxskb)->dccpd_ack_seq, 1); |
3df80d93 ACM |
340 | |
341 | dccp_hdr_set_seq(dh, seqno); | |
09dbc389 | 342 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq); |
3df80d93 | 343 | |
6f4e5fff | 344 | dccp_csum_outgoing(skb); |
0660e03f ACM |
345 | rxip6h = ipv6_hdr(rxskb); |
346 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, | |
347 | &rxip6h->daddr); | |
6f4e5fff | 348 | |
3df80d93 | 349 | memset(&fl, 0, sizeof(fl)); |
0660e03f ACM |
350 | ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr); |
351 | ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr); | |
6f4e5fff | 352 | |
3df80d93 ACM |
353 | fl.proto = IPPROTO_DCCP; |
354 | fl.oif = inet6_iif(rxskb); | |
355 | fl.fl_ip_dport = dh->dccph_dport; | |
356 | fl.fl_ip_sport = dh->dccph_sport; | |
beb8d13b | 357 | security_skb_classify_flow(rxskb, &fl); |
3df80d93 ACM |
358 | |
359 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
360 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
361 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 362 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
363 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
364 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
365 | return; | |
366 | } | |
367 | } | |
368 | ||
369 | kfree_skb(skb); | |
370 | } | |
371 | ||
73c9e02c GR |
372 | static struct request_sock_ops dccp6_request_sock_ops = { |
373 | .family = AF_INET6, | |
374 | .obj_size = sizeof(struct dccp6_request_sock), | |
375 | .rtx_syn_ack = dccp_v6_send_response, | |
376 | .send_ack = dccp_reqsk_send_ack, | |
377 | .destructor = dccp_v6_reqsk_destructor, | |
378 | .send_reset = dccp_v6_ctl_send_reset, | |
379 | }; | |
380 | ||
3df80d93 ACM |
381 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
382 | { | |
383 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 384 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
385 | struct sock *nsk; |
386 | struct request_sock **prev; | |
387 | /* Find possible connection requests. */ | |
388 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
389 | dh->dccph_sport, | |
390 | &iph->saddr, | |
391 | &iph->daddr, | |
392 | inet6_iif(skb)); | |
393 | if (req != NULL) | |
394 | return dccp_check_req(sk, skb, req, prev); | |
395 | ||
396 | nsk = __inet6_lookup_established(&dccp_hashinfo, | |
397 | &iph->saddr, dh->dccph_sport, | |
398 | &iph->daddr, ntohs(dh->dccph_dport), | |
399 | inet6_iif(skb)); | |
3df80d93 ACM |
400 | if (nsk != NULL) { |
401 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
402 | bh_lock_sock(nsk); | |
403 | return nsk; | |
404 | } | |
9469c7b4 | 405 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
406 | return NULL; |
407 | } | |
408 | ||
409 | return sk; | |
410 | } | |
411 | ||
412 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
413 | { | |
3df80d93 ACM |
414 | struct request_sock *req; |
415 | struct dccp_request_sock *dreq; | |
416 | struct inet6_request_sock *ireq6; | |
417 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 418 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 ACM |
419 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
420 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
421 | ||
422 | if (skb->protocol == htons(ETH_P_IP)) | |
423 | return dccp_v4_conn_request(sk, skb); | |
424 | ||
425 | if (!ipv6_unicast_destination(skb)) | |
45329e71 | 426 | goto drop; |
3df80d93 ACM |
427 | |
428 | if (dccp_bad_service_code(sk, service)) { | |
429 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
430 | goto drop; | |
8109b02b | 431 | } |
3df80d93 | 432 | /* |
45329e71 | 433 | * There are no SYN attacks on IPv6, yet... |
3df80d93 ACM |
434 | */ |
435 | if (inet_csk_reqsk_queue_is_full(sk)) | |
45329e71 | 436 | goto drop; |
3df80d93 ACM |
437 | |
438 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
439 | goto drop; | |
440 | ||
82709531 | 441 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
442 | if (req == NULL) |
443 | goto drop; | |
444 | ||
cf557926 GR |
445 | if (dccp_parse_options(sk, skb)) |
446 | goto drop_and_free; | |
3df80d93 | 447 | |
cf557926 | 448 | dccp_reqsk_init(req, skb); |
3df80d93 | 449 | |
4237c75c VY |
450 | if (security_inet_conn_request(sk, skb, req)) |
451 | goto drop_and_free; | |
452 | ||
3df80d93 | 453 | ireq6 = inet6_rsk(req); |
0660e03f ACM |
454 | ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr); |
455 | ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr); | |
3df80d93 ACM |
456 | ireq6->pktopts = NULL; |
457 | ||
458 | if (ipv6_opt_accepted(sk, skb) || | |
459 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
460 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
461 | atomic_inc(&skb->users); | |
462 | ireq6->pktopts = skb; | |
463 | } | |
464 | ireq6->iif = sk->sk_bound_dev_if; | |
465 | ||
466 | /* So that link locals have meaning */ | |
467 | if (!sk->sk_bound_dev_if && | |
468 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
469 | ireq6->iif = inet6_iif(skb); | |
470 | ||
45329e71 | 471 | /* |
3df80d93 ACM |
472 | * Step 3: Process LISTEN state |
473 | * | |
d83ca5ac | 474 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 475 | * |
d83ca5ac GR |
476 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
477 | * dccp_create_openreq_child. | |
3df80d93 ACM |
478 | */ |
479 | dreq = dccp_rsk(req); | |
480 | dreq->dreq_isr = dcb->dccpd_seq; | |
865e9022 | 481 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
482 | dreq->dreq_service = service; |
483 | ||
484 | if (dccp_v6_send_response(sk, req, NULL)) | |
485 | goto drop_and_free; | |
486 | ||
487 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
488 | return 0; | |
489 | ||
490 | drop_and_free: | |
491 | reqsk_free(req); | |
492 | drop: | |
493 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
494 | dcb->dccpd_reset_code = reset_code; | |
495 | return -1; | |
496 | } | |
497 | ||
498 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
499 | struct sk_buff *skb, | |
500 | struct request_sock *req, | |
501 | struct dst_entry *dst) | |
502 | { | |
503 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
504 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
505 | struct inet_sock *newinet; | |
506 | struct dccp_sock *newdp; | |
507 | struct dccp6_sock *newdp6; | |
508 | struct sock *newsk; | |
509 | struct ipv6_txoptions *opt; | |
510 | ||
511 | if (skb->protocol == htons(ETH_P_IP)) { | |
512 | /* | |
513 | * v6 mapped | |
514 | */ | |
3df80d93 | 515 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 516 | if (newsk == NULL) |
3df80d93 ACM |
517 | return NULL; |
518 | ||
519 | newdp6 = (struct dccp6_sock *)newsk; | |
520 | newdp = dccp_sk(newsk); | |
521 | newinet = inet_sk(newsk); | |
522 | newinet->pinet6 = &newdp6->inet6; | |
523 | newnp = inet6_sk(newsk); | |
524 | ||
525 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
526 | ||
527 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
528 | newinet->daddr); | |
529 | ||
530 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
531 | newinet->saddr); | |
532 | ||
533 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
534 | ||
535 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
536 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
537 | newnp->pktoptions = NULL; | |
538 | newnp->opt = NULL; | |
539 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 540 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
541 | |
542 | /* | |
543 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
544 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
545 | * that function for the gory details. -acme | |
546 | */ | |
547 | ||
548 | /* It is tricky place. Until this moment IPv4 tcp | |
549 | worked with IPv6 icsk.icsk_af_ops. | |
550 | Sync it now. | |
551 | */ | |
d83d8461 | 552 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
553 | |
554 | return newsk; | |
555 | } | |
556 | ||
557 | opt = np->opt; | |
558 | ||
559 | if (sk_acceptq_is_full(sk)) | |
560 | goto out_overflow; | |
561 | ||
3df80d93 ACM |
562 | if (dst == NULL) { |
563 | struct in6_addr *final_p = NULL, final; | |
564 | struct flowi fl; | |
565 | ||
566 | memset(&fl, 0, sizeof(fl)); | |
567 | fl.proto = IPPROTO_DCCP; | |
568 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
569 | if (opt != NULL && opt->srcrt != NULL) { |
570 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
571 | ||
3df80d93 ACM |
572 | ipv6_addr_copy(&final, &fl.fl6_dst); |
573 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
574 | final_p = &final; | |
575 | } | |
576 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
577 | fl.oif = sk->sk_bound_dev_if; | |
578 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
579 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
beb8d13b | 580 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
581 | |
582 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
583 | goto out; | |
584 | ||
585 | if (final_p) | |
586 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
587 | ||
588 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
589 | goto out; | |
45329e71 | 590 | } |
3df80d93 ACM |
591 | |
592 | newsk = dccp_create_openreq_child(sk, req, skb); | |
593 | if (newsk == NULL) | |
594 | goto out; | |
595 | ||
596 | /* | |
597 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
598 | * count here, dccp_create_openreq_child now does this for us, see the | |
599 | * comment in that function for the gory details. -acme | |
600 | */ | |
601 | ||
8e1ef0a9 | 602 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
603 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
604 | NETIF_F_TSO); | |
3df80d93 ACM |
605 | newdp6 = (struct dccp6_sock *)newsk; |
606 | newinet = inet_sk(newsk); | |
607 | newinet->pinet6 = &newdp6->inet6; | |
608 | newdp = dccp_sk(newsk); | |
609 | newnp = inet6_sk(newsk); | |
610 | ||
611 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
612 | ||
613 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
614 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
615 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
616 | newsk->sk_bound_dev_if = ireq6->iif; | |
617 | ||
45329e71 | 618 | /* Now IPv6 options... |
3df80d93 ACM |
619 | |
620 | First: no IPv4 options. | |
621 | */ | |
622 | newinet->opt = NULL; | |
623 | ||
624 | /* Clone RX bits */ | |
625 | newnp->rxopt.all = np->rxopt.all; | |
626 | ||
627 | /* Clone pktoptions received with SYN */ | |
628 | newnp->pktoptions = NULL; | |
629 | if (ireq6->pktopts != NULL) { | |
630 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
631 | kfree_skb(ireq6->pktopts); | |
632 | ireq6->pktopts = NULL; | |
633 | if (newnp->pktoptions) | |
634 | skb_set_owner_r(newnp->pktoptions, newsk); | |
635 | } | |
636 | newnp->opt = NULL; | |
637 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 638 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 639 | |
45329e71 ACM |
640 | /* |
641 | * Clone native IPv6 options from listening socket (if any) | |
642 | * | |
643 | * Yes, keeping reference count would be much more clever, but we make | |
644 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 645 | */ |
45329e71 | 646 | if (opt != NULL) { |
3df80d93 ACM |
647 | newnp->opt = ipv6_dup_options(newsk, opt); |
648 | if (opt != np->opt) | |
649 | sock_kfree_s(sk, opt, opt->tot_len); | |
650 | } | |
651 | ||
d83d8461 | 652 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 653 | if (newnp->opt != NULL) |
d83d8461 ACM |
654 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
655 | newnp->opt->opt_flen); | |
3df80d93 ACM |
656 | |
657 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
658 | ||
659 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
660 | ||
661 | __inet6_hash(&dccp_hashinfo, newsk); | |
662 | inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
663 | ||
664 | return newsk; | |
665 | ||
666 | out_overflow: | |
667 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
668 | out: | |
669 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
45329e71 | 670 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
671 | sock_kfree_s(sk, opt, opt->tot_len); |
672 | dst_release(dst); | |
673 | return NULL; | |
674 | } | |
675 | ||
676 | /* The socket must have it's spinlock held when we get | |
677 | * here. | |
678 | * | |
679 | * We have a potential double-lock case here, so even when | |
680 | * doing backlog processing we use the BH locking scheme. | |
681 | * This is because we cannot sleep with the original spinlock | |
682 | * held. | |
683 | */ | |
684 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
685 | { | |
686 | struct ipv6_pinfo *np = inet6_sk(sk); | |
687 | struct sk_buff *opt_skb = NULL; | |
688 | ||
689 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
690 | goes to IPv4 receive handler and backlogged. | |
691 | From backlog it always goes here. Kerboom... | |
692 | Fortunately, dccp_rcv_established and rcv_established | |
693 | handle them correctly, but it is not case with | |
694 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
695 | */ | |
696 | ||
697 | if (skb->protocol == htons(ETH_P_IP)) | |
698 | return dccp_v4_do_rcv(sk, skb); | |
699 | ||
fda9ef5d | 700 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
701 | goto discard; |
702 | ||
703 | /* | |
45329e71 ACM |
704 | * socket locking is here for SMP purposes as backlog rcv is currently |
705 | * called with bh processing disabled. | |
3df80d93 ACM |
706 | */ |
707 | ||
708 | /* Do Stevens' IPV6_PKTOPTIONS. | |
709 | ||
710 | Yes, guys, it is the only place in our code, where we | |
711 | may make it not affecting IPv4. | |
712 | The rest of code is protocol independent, | |
713 | and I do not like idea to uglify IPv4. | |
714 | ||
715 | Actually, all the idea behind IPV6_PKTOPTIONS | |
716 | looks not very well thought. For now we latch | |
717 | options, received in the last packet, enqueued | |
718 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 719 | --ANK (980728) |
3df80d93 ACM |
720 | */ |
721 | if (np->rxopt.all) | |
89e7e577 GR |
722 | /* |
723 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
724 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
725 | */ | |
3df80d93 ACM |
726 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
727 | ||
728 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
729 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
730 | goto reset; | |
fd169f15 | 731 | if (opt_skb) { |
89e7e577 | 732 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
733 | __kfree_skb(opt_skb); |
734 | } | |
3df80d93 ACM |
735 | return 0; |
736 | } | |
737 | ||
d83ca5ac GR |
738 | /* |
739 | * Step 3: Process LISTEN state | |
740 | * If S.state == LISTEN, | |
741 | * If P.type == Request or P contains a valid Init Cookie option, | |
742 | * (* Must scan the packet's options to check for Init | |
743 | * Cookies. Only Init Cookies are processed here, | |
744 | * however; other options are processed in Step 8. This | |
745 | * scan need only be performed if the endpoint uses Init | |
746 | * Cookies *) | |
747 | * (* Generate a new socket and switch to that socket *) | |
748 | * Set S := new socket for this port pair | |
749 | * S.state = RESPOND | |
750 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
751 | * Initialize S.GAR := S.ISS | |
752 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
753 | * Continue with S.state == RESPOND | |
754 | * (* A Response packet will be generated in Step 11 *) | |
755 | * Otherwise, | |
756 | * Generate Reset(No Connection) unless P.type == Reset | |
757 | * Drop packet and return | |
758 | * | |
759 | * NOTE: the check for the packet types is done in | |
760 | * dccp_rcv_state_process | |
761 | */ | |
45329e71 | 762 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 763 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 764 | |
45329e71 ACM |
765 | if (nsk == NULL) |
766 | goto discard; | |
3df80d93 ACM |
767 | /* |
768 | * Queue it on the new socket if the new socket is active, | |
769 | * otherwise we just shortcircuit this and continue with | |
770 | * the new socket.. | |
771 | */ | |
8109b02b | 772 | if (nsk != sk) { |
3df80d93 ACM |
773 | if (dccp_child_process(sk, nsk, skb)) |
774 | goto reset; | |
45329e71 | 775 | if (opt_skb != NULL) |
3df80d93 ACM |
776 | __kfree_skb(opt_skb); |
777 | return 0; | |
778 | } | |
779 | } | |
780 | ||
781 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
782 | goto reset; | |
fd169f15 | 783 | if (opt_skb) { |
89e7e577 | 784 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
785 | __kfree_skb(opt_skb); |
786 | } | |
3df80d93 ACM |
787 | return 0; |
788 | ||
789 | reset: | |
cfb6eeb4 | 790 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 791 | discard: |
45329e71 | 792 | if (opt_skb != NULL) |
3df80d93 ACM |
793 | __kfree_skb(opt_skb); |
794 | kfree_skb(skb); | |
795 | return 0; | |
796 | } | |
797 | ||
951dbc8a | 798 | static int dccp_v6_rcv(struct sk_buff **pskb) |
3df80d93 ACM |
799 | { |
800 | const struct dccp_hdr *dh; | |
801 | struct sk_buff *skb = *pskb; | |
802 | struct sock *sk; | |
6f4e5fff | 803 | int min_cov; |
3df80d93 | 804 | |
6f4e5fff | 805 | /* Step 1: Check header basics */ |
3df80d93 ACM |
806 | |
807 | if (dccp_invalid_packet(skb)) | |
808 | goto discard_it; | |
809 | ||
6f4e5fff | 810 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
811 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
812 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 813 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
814 | goto discard_it; |
815 | } | |
816 | ||
3df80d93 ACM |
817 | dh = dccp_hdr(skb); |
818 | ||
819 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); | |
820 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
821 | ||
822 | if (dccp_packet_without_ack(skb)) | |
823 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
824 | else | |
825 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
826 | ||
827 | /* Step 2: | |
8109b02b | 828 | * Look up flow ID in table and get corresponding socket */ |
0660e03f | 829 | sk = __inet6_lookup(&dccp_hashinfo, &ipv6_hdr(skb)->saddr, |
3df80d93 | 830 | dh->dccph_sport, |
0660e03f | 831 | &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport), |
3df80d93 | 832 | inet6_iif(skb)); |
45329e71 | 833 | /* |
3df80d93 | 834 | * Step 2: |
8109b02b | 835 | * If no socket ... |
3df80d93 | 836 | */ |
d23c7107 GR |
837 | if (sk == NULL) { |
838 | dccp_pr_debug("failed to look up flow ID in table and " | |
839 | "get corresponding socket\n"); | |
3df80d93 | 840 | goto no_dccp_socket; |
d23c7107 | 841 | } |
3df80d93 | 842 | |
45329e71 | 843 | /* |
3df80d93 | 844 | * Step 2: |
8109b02b | 845 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
846 | * Generate Reset(No Connection) unless P.type == Reset |
847 | * Drop packet and return | |
848 | */ | |
d23c7107 GR |
849 | if (sk->sk_state == DCCP_TIME_WAIT) { |
850 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
851 | inet_twsk_put(inet_twsk(sk)); | |
852 | goto no_dccp_socket; | |
853 | } | |
3df80d93 | 854 | |
6f4e5fff GR |
855 | /* |
856 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
857 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
858 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
859 | */ |
860 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
861 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
862 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
863 | dh->dccph_cscov, min_cov); | |
864 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
865 | goto discard_and_relse; | |
866 | } | |
867 | ||
3df80d93 ACM |
868 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
869 | goto discard_and_relse; | |
870 | ||
58a5a7b9 | 871 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
872 | |
873 | no_dccp_socket: | |
874 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
875 | goto discard_it; | |
876 | /* | |
877 | * Step 2: | |
8109b02b | 878 | * If no socket ... |
3df80d93 ACM |
879 | * Generate Reset(No Connection) unless P.type == Reset |
880 | * Drop packet and return | |
881 | */ | |
882 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
883 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
884 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 885 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 886 | } |
3df80d93 | 887 | |
d23c7107 | 888 | discard_it: |
3df80d93 ACM |
889 | kfree_skb(skb); |
890 | return 0; | |
891 | ||
892 | discard_and_relse: | |
893 | sock_put(sk); | |
894 | goto discard_it; | |
3df80d93 ACM |
895 | } |
896 | ||
73c9e02c GR |
897 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
898 | int addr_len) | |
899 | { | |
900 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
901 | struct inet_connection_sock *icsk = inet_csk(sk); | |
902 | struct inet_sock *inet = inet_sk(sk); | |
903 | struct ipv6_pinfo *np = inet6_sk(sk); | |
904 | struct dccp_sock *dp = dccp_sk(sk); | |
905 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
906 | struct flowi fl; | |
907 | struct dst_entry *dst; | |
908 | int addr_type; | |
909 | int err; | |
910 | ||
911 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
912 | ||
913 | if (addr_len < SIN6_LEN_RFC2133) | |
914 | return -EINVAL; | |
915 | ||
916 | if (usin->sin6_family != AF_INET6) | |
917 | return -EAFNOSUPPORT; | |
918 | ||
919 | memset(&fl, 0, sizeof(fl)); | |
920 | ||
921 | if (np->sndflow) { | |
922 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
923 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
924 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
925 | struct ip6_flowlabel *flowlabel; | |
926 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
927 | if (flowlabel == NULL) | |
928 | return -EINVAL; | |
929 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
930 | fl6_sock_release(flowlabel); | |
931 | } | |
932 | } | |
933 | /* | |
934 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
935 | */ | |
936 | if (ipv6_addr_any(&usin->sin6_addr)) | |
937 | usin->sin6_addr.s6_addr[15] = 1; | |
938 | ||
939 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
940 | ||
941 | if (addr_type & IPV6_ADDR_MULTICAST) | |
942 | return -ENETUNREACH; | |
943 | ||
944 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
945 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
946 | usin->sin6_scope_id) { | |
947 | /* If interface is set while binding, indices | |
948 | * must coincide. | |
949 | */ | |
950 | if (sk->sk_bound_dev_if && | |
951 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
952 | return -EINVAL; | |
953 | ||
954 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
955 | } | |
956 | ||
957 | /* Connect to link-local address requires an interface */ | |
958 | if (!sk->sk_bound_dev_if) | |
959 | return -EINVAL; | |
960 | } | |
961 | ||
962 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
963 | np->flow_label = fl.fl6_flowlabel; | |
964 | ||
965 | /* | |
966 | * DCCP over IPv4 | |
967 | */ | |
968 | if (addr_type == IPV6_ADDR_MAPPED) { | |
969 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
970 | struct sockaddr_in sin; | |
971 | ||
972 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
973 | ||
974 | if (__ipv6_only_sock(sk)) | |
975 | return -ENETUNREACH; | |
976 | ||
977 | sin.sin_family = AF_INET; | |
978 | sin.sin_port = usin->sin6_port; | |
979 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
980 | ||
981 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
982 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
983 | ||
984 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
985 | if (err) { | |
986 | icsk->icsk_ext_hdr_len = exthdrlen; | |
987 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
988 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
989 | goto failure; | |
990 | } else { | |
991 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
992 | inet->saddr); | |
993 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
994 | inet->rcv_saddr); | |
995 | } | |
996 | ||
997 | return err; | |
998 | } | |
999 | ||
1000 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
1001 | saddr = &np->rcv_saddr; | |
1002 | ||
1003 | fl.proto = IPPROTO_DCCP; | |
1004 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1005 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
1006 | fl.oif = sk->sk_bound_dev_if; | |
1007 | fl.fl_ip_dport = usin->sin6_port; | |
1008 | fl.fl_ip_sport = inet->sport; | |
1009 | security_sk_classify_flow(sk, &fl); | |
1010 | ||
1011 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
1012 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
1013 | ||
1014 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1015 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1016 | final_p = &final; | |
1017 | } | |
1018 | ||
1019 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1020 | if (err) | |
1021 | goto failure; | |
1022 | ||
1023 | if (final_p) | |
1024 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1025 | ||
14e50e57 DM |
1026 | err = __xfrm_lookup(&dst, &fl, sk, 1); |
1027 | if (err < 0) { | |
1028 | if (err == -EREMOTE) | |
1029 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
1030 | if (err < 0) | |
1031 | goto failure; | |
1032 | } | |
73c9e02c GR |
1033 | |
1034 | if (saddr == NULL) { | |
1035 | saddr = &fl.fl6_src; | |
1036 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1037 | } | |
1038 | ||
1039 | /* set the source address */ | |
1040 | ipv6_addr_copy(&np->saddr, saddr); | |
1041 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1042 | ||
1043 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1044 | ||
1045 | icsk->icsk_ext_hdr_len = 0; | |
1046 | if (np->opt != NULL) | |
1047 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1048 | np->opt->opt_nflen); | |
1049 | ||
1050 | inet->dport = usin->sin6_port; | |
1051 | ||
1052 | dccp_set_state(sk, DCCP_REQUESTING); | |
1053 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1054 | if (err) | |
1055 | goto late_failure; | |
d7f7365f GR |
1056 | |
1057 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1058 | np->daddr.s6_addr32, | |
1059 | inet->sport, inet->dport); | |
73c9e02c GR |
1060 | err = dccp_connect(sk); |
1061 | if (err) | |
1062 | goto late_failure; | |
1063 | ||
1064 | return 0; | |
1065 | ||
1066 | late_failure: | |
1067 | dccp_set_state(sk, DCCP_CLOSED); | |
1068 | __sk_dst_reset(sk); | |
1069 | failure: | |
1070 | inet->dport = 0; | |
1071 | sk->sk_route_caps = 0; | |
1072 | return err; | |
1073 | } | |
1074 | ||
3df80d93 | 1075 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1076 | .queue_xmit = inet6_csk_xmit, |
1077 | .send_check = dccp_v6_send_check, | |
1078 | .rebuild_header = inet6_sk_rebuild_header, | |
1079 | .conn_request = dccp_v6_conn_request, | |
1080 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1081 | .net_header_len = sizeof(struct ipv6hdr), | |
1082 | .setsockopt = ipv6_setsockopt, | |
1083 | .getsockopt = ipv6_getsockopt, | |
1084 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1085 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1086 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1087 | .compat_setsockopt = compat_ipv6_setsockopt, |
1088 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1089 | #endif |
3df80d93 ACM |
1090 | }; |
1091 | ||
1092 | /* | |
1093 | * DCCP over IPv4 via INET6 API | |
1094 | */ | |
1095 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1096 | .queue_xmit = ip_queue_xmit, |
1097 | .send_check = dccp_v4_send_check, | |
1098 | .rebuild_header = inet_sk_rebuild_header, | |
1099 | .conn_request = dccp_v6_conn_request, | |
1100 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1101 | .net_header_len = sizeof(struct iphdr), | |
1102 | .setsockopt = ipv6_setsockopt, | |
1103 | .getsockopt = ipv6_getsockopt, | |
1104 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1105 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1106 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1107 | .compat_setsockopt = compat_ipv6_setsockopt, |
1108 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1109 | #endif |
3df80d93 ACM |
1110 | }; |
1111 | ||
1112 | /* NOTE: A lot of things set to zero explicitly by call to | |
1113 | * sk_alloc() so need not be done here. | |
1114 | */ | |
1115 | static int dccp_v6_init_sock(struct sock *sk) | |
1116 | { | |
72478873 ACM |
1117 | static __u8 dccp_v6_ctl_sock_initialized; |
1118 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1119 | |
72478873 ACM |
1120 | if (err == 0) { |
1121 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1122 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1123 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1124 | } |
3df80d93 ACM |
1125 | |
1126 | return err; | |
1127 | } | |
1128 | ||
1129 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1130 | { | |
3e0fadc5 | 1131 | dccp_destroy_sock(sk); |
3df80d93 ACM |
1132 | return inet6_destroy_sock(sk); |
1133 | } | |
1134 | ||
73c9e02c GR |
1135 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1136 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1137 | }; | |
1138 | ||
3df80d93 | 1139 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1140 | .name = "DCCPv6", |
1141 | .owner = THIS_MODULE, | |
1142 | .close = dccp_close, | |
1143 | .connect = dccp_v6_connect, | |
1144 | .disconnect = dccp_disconnect, | |
1145 | .ioctl = dccp_ioctl, | |
1146 | .init = dccp_v6_init_sock, | |
1147 | .setsockopt = dccp_setsockopt, | |
1148 | .getsockopt = dccp_getsockopt, | |
1149 | .sendmsg = dccp_sendmsg, | |
1150 | .recvmsg = dccp_recvmsg, | |
1151 | .backlog_rcv = dccp_v6_do_rcv, | |
1152 | .hash = dccp_v6_hash, | |
1153 | .unhash = dccp_unhash, | |
1154 | .accept = inet_csk_accept, | |
1155 | .get_port = dccp_v6_get_port, | |
1156 | .shutdown = dccp_shutdown, | |
1157 | .destroy = dccp_v6_destroy_sock, | |
1158 | .orphan_count = &dccp_orphan_count, | |
1159 | .max_header = MAX_DCCP_HEADER, | |
1160 | .obj_size = sizeof(struct dccp6_sock), | |
1161 | .rsk_prot = &dccp6_request_sock_ops, | |
1162 | .twsk_prot = &dccp6_timewait_sock_ops, | |
3fdadf7d | 1163 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1164 | .compat_setsockopt = compat_dccp_setsockopt, |
1165 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1166 | #endif |
3df80d93 ACM |
1167 | }; |
1168 | ||
1169 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1170 | .handler = dccp_v6_rcv, |
1171 | .err_handler = dccp_v6_err, | |
1172 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1173 | }; |
1174 | ||
1175 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1176 | .family = PF_INET6, |
1177 | .owner = THIS_MODULE, | |
1178 | .release = inet6_release, | |
1179 | .bind = inet6_bind, | |
1180 | .connect = inet_stream_connect, | |
1181 | .socketpair = sock_no_socketpair, | |
1182 | .accept = inet_accept, | |
1183 | .getname = inet6_getname, | |
1184 | .poll = dccp_poll, | |
1185 | .ioctl = inet6_ioctl, | |
1186 | .listen = inet_dccp_listen, | |
1187 | .shutdown = inet_shutdown, | |
1188 | .setsockopt = sock_common_setsockopt, | |
1189 | .getsockopt = sock_common_getsockopt, | |
1190 | .sendmsg = inet_sendmsg, | |
1191 | .recvmsg = sock_common_recvmsg, | |
1192 | .mmap = sock_no_mmap, | |
1193 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1194 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1195 | .compat_setsockopt = compat_sock_common_setsockopt, |
1196 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1197 | #endif |
3df80d93 ACM |
1198 | }; |
1199 | ||
1200 | static struct inet_protosw dccp_v6_protosw = { | |
1201 | .type = SOCK_DCCP, | |
1202 | .protocol = IPPROTO_DCCP, | |
1203 | .prot = &dccp_v6_prot, | |
1204 | .ops = &inet6_dccp_ops, | |
1205 | .capability = -1, | |
d83d8461 | 1206 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1207 | }; |
1208 | ||
1209 | static int __init dccp_v6_init(void) | |
1210 | { | |
1211 | int err = proto_register(&dccp_v6_prot, 1); | |
1212 | ||
1213 | if (err != 0) | |
1214 | goto out; | |
1215 | ||
1216 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1217 | if (err != 0) | |
1218 | goto out_unregister_proto; | |
1219 | ||
1220 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1221 | |
c4d93909 ACM |
1222 | err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
1223 | SOCK_DCCP, IPPROTO_DCCP); | |
1224 | if (err != 0) | |
72478873 | 1225 | goto out_unregister_protosw; |
3df80d93 ACM |
1226 | out: |
1227 | return err; | |
72478873 ACM |
1228 | out_unregister_protosw: |
1229 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1230 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1231 | out_unregister_proto: |
1232 | proto_unregister(&dccp_v6_prot); | |
1233 | goto out; | |
1234 | } | |
1235 | ||
1236 | static void __exit dccp_v6_exit(void) | |
1237 | { | |
1238 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1239 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1240 | proto_unregister(&dccp_v6_prot); | |
1241 | } | |
1242 | ||
1243 | module_init(dccp_v6_init); | |
1244 | module_exit(dccp_v6_exit); | |
1245 | ||
1246 | /* | |
1247 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1248 | * values directly, Also cover the case where the protocol is not specified, | |
1249 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1250 | */ | |
1251 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); | |
1252 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); | |
1253 | MODULE_LICENSE("GPL"); | |
1254 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1255 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |