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 | |
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 GR |
61 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
62 | static inline u16 dccp_v6_csum_finish(struct sk_buff *skb, | |
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 | ||
d7f7365f GR |
79 | static inline __u32 secure_dccpv6_sequence_number(__u32 *saddr, __u32 *daddr, |
80 | __u16 sport, __u16 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 | { | |
87 | return secure_dccpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, | |
88 | skb->nh.ipv6h->saddr.s6_addr32, | |
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; | |
256 | if (opt == NULL && | |
257 | np->rxopt.bits.osrcrt == 2 && | |
258 | ireq6->pktopts) { | |
259 | struct sk_buff *pktopts = ireq6->pktopts; | |
260 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); | |
45329e71 | 261 | |
3df80d93 ACM |
262 | if (rxopt->srcrt) |
263 | opt = ipv6_invert_rthdr(sk, | |
264 | (struct ipv6_rt_hdr *)(pktopts->nh.raw + | |
265 | rxopt->srcrt)); | |
266 | } | |
267 | ||
45329e71 ACM |
268 | if (opt != NULL && opt->srcrt != NULL) { |
269 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
270 | ||
3df80d93 ACM |
271 | ipv6_addr_copy(&final, &fl.fl6_dst); |
272 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
273 | final_p = &final; | |
274 | } | |
275 | ||
276 | err = ip6_dst_lookup(sk, &dst, &fl); | |
277 | if (err) | |
278 | goto done; | |
45329e71 | 279 | |
3df80d93 ACM |
280 | if (final_p) |
281 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
45329e71 ACM |
282 | |
283 | err = xfrm_lookup(&dst, &fl, sk, 0); | |
284 | if (err < 0) | |
3df80d93 ACM |
285 | goto done; |
286 | } | |
287 | ||
288 | skb = dccp_make_response(sk, dst, req); | |
289 | if (skb != NULL) { | |
290 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 291 | |
6f4e5fff GR |
292 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
293 | &ireq6->loc_addr, | |
294 | &ireq6->rmt_addr); | |
3df80d93 ACM |
295 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); |
296 | err = ip6_xmit(sk, skb, &fl, opt, 0); | |
b9df3cb8 | 297 | err = net_xmit_eval(err); |
3df80d93 ACM |
298 | } |
299 | ||
300 | done: | |
45329e71 | 301 | if (opt != NULL && opt != np->opt) |
3df80d93 | 302 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 303 | dst_release(dst); |
3df80d93 ACM |
304 | return err; |
305 | } | |
306 | ||
307 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
308 | { | |
309 | if (inet6_rsk(req)->pktopts != NULL) | |
310 | kfree_skb(inet6_rsk(req)->pktopts); | |
311 | } | |
312 | ||
3df80d93 ACM |
313 | static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb) |
314 | { | |
45329e71 | 315 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; |
118b2c95 | 316 | const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) + |
3df80d93 ACM |
317 | sizeof(struct dccp_hdr_ext) + |
318 | sizeof(struct dccp_hdr_reset); | |
319 | struct sk_buff *skb; | |
320 | struct flowi fl; | |
09dbc389 | 321 | u64 seqno = 0; |
3df80d93 ACM |
322 | |
323 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
324 | return; | |
325 | ||
326 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 327 | return; |
3df80d93 | 328 | |
118b2c95 ACM |
329 | skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header, |
330 | GFP_ATOMIC); | |
45329e71 | 331 | if (skb == NULL) |
3df80d93 ACM |
332 | return; |
333 | ||
118b2c95 | 334 | skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header); |
3df80d93 | 335 | |
9b42078e | 336 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
3df80d93 ACM |
337 | |
338 | /* Swap the send and the receive. */ | |
339 | dh->dccph_type = DCCP_PKT_RESET; | |
340 | dh->dccph_sport = rxdh->dccph_dport; | |
341 | dh->dccph_dport = rxdh->dccph_sport; | |
342 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
343 | dh->dccph_x = 1; | |
344 | dccp_hdr_reset(skb)->dccph_reset_code = | |
345 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
346 | ||
0e64e94e | 347 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
3df80d93 ACM |
348 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) |
349 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
350 | ||
351 | dccp_hdr_set_seq(dh, seqno); | |
09dbc389 | 352 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq); |
3df80d93 | 353 | |
6f4e5fff GR |
354 | dccp_csum_outgoing(skb); |
355 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr, | |
356 | &rxskb->nh.ipv6h->daddr); | |
357 | ||
3df80d93 ACM |
358 | memset(&fl, 0, sizeof(fl)); |
359 | ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr); | |
360 | ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr); | |
6f4e5fff | 361 | |
3df80d93 ACM |
362 | fl.proto = IPPROTO_DCCP; |
363 | fl.oif = inet6_iif(rxskb); | |
364 | fl.fl_ip_dport = dh->dccph_dport; | |
365 | fl.fl_ip_sport = dh->dccph_sport; | |
beb8d13b | 366 | security_skb_classify_flow(rxskb, &fl); |
3df80d93 ACM |
367 | |
368 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
369 | if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) { | |
370 | if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) { | |
72478873 | 371 | ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0); |
3df80d93 ACM |
372 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
373 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
374 | return; | |
375 | } | |
376 | } | |
377 | ||
378 | kfree_skb(skb); | |
379 | } | |
380 | ||
73c9e02c GR |
381 | static struct request_sock_ops dccp6_request_sock_ops = { |
382 | .family = AF_INET6, | |
383 | .obj_size = sizeof(struct dccp6_request_sock), | |
384 | .rtx_syn_ack = dccp_v6_send_response, | |
385 | .send_ack = dccp_reqsk_send_ack, | |
386 | .destructor = dccp_v6_reqsk_destructor, | |
387 | .send_reset = dccp_v6_ctl_send_reset, | |
388 | }; | |
389 | ||
3df80d93 ACM |
390 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
391 | { | |
392 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
393 | const struct ipv6hdr *iph = skb->nh.ipv6h; | |
394 | struct sock *nsk; | |
395 | struct request_sock **prev; | |
396 | /* Find possible connection requests. */ | |
397 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
398 | dh->dccph_sport, | |
399 | &iph->saddr, | |
400 | &iph->daddr, | |
401 | inet6_iif(skb)); | |
402 | if (req != NULL) | |
403 | return dccp_check_req(sk, skb, req, prev); | |
404 | ||
405 | nsk = __inet6_lookup_established(&dccp_hashinfo, | |
406 | &iph->saddr, dh->dccph_sport, | |
407 | &iph->daddr, ntohs(dh->dccph_dport), | |
408 | inet6_iif(skb)); | |
3df80d93 ACM |
409 | if (nsk != NULL) { |
410 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
411 | bh_lock_sock(nsk); | |
412 | return nsk; | |
413 | } | |
9469c7b4 | 414 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
415 | return NULL; |
416 | } | |
417 | ||
418 | return sk; | |
419 | } | |
420 | ||
421 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
422 | { | |
3df80d93 ACM |
423 | struct request_sock *req; |
424 | struct dccp_request_sock *dreq; | |
425 | struct inet6_request_sock *ireq6; | |
426 | struct ipv6_pinfo *np = inet6_sk(sk); | |
60fe62e7 | 427 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 ACM |
428 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
429 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
430 | ||
431 | if (skb->protocol == htons(ETH_P_IP)) | |
432 | return dccp_v4_conn_request(sk, skb); | |
433 | ||
434 | if (!ipv6_unicast_destination(skb)) | |
45329e71 | 435 | goto drop; |
3df80d93 ACM |
436 | |
437 | if (dccp_bad_service_code(sk, service)) { | |
438 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
439 | goto drop; | |
440 | } | |
441 | /* | |
45329e71 | 442 | * There are no SYN attacks on IPv6, yet... |
3df80d93 ACM |
443 | */ |
444 | if (inet_csk_reqsk_queue_is_full(sk)) | |
45329e71 | 445 | goto drop; |
3df80d93 ACM |
446 | |
447 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
448 | goto drop; | |
449 | ||
82709531 | 450 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
451 | if (req == NULL) |
452 | goto drop; | |
453 | ||
cf557926 GR |
454 | if (dccp_parse_options(sk, skb)) |
455 | goto drop_and_free; | |
3df80d93 | 456 | |
cf557926 | 457 | dccp_reqsk_init(req, skb); |
3df80d93 | 458 | |
4237c75c VY |
459 | if (security_inet_conn_request(sk, skb, req)) |
460 | goto drop_and_free; | |
461 | ||
3df80d93 | 462 | ireq6 = inet6_rsk(req); |
3df80d93 ACM |
463 | ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr); |
464 | ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr); | |
3df80d93 ACM |
465 | ireq6->pktopts = NULL; |
466 | ||
467 | if (ipv6_opt_accepted(sk, skb) || | |
468 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
469 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
470 | atomic_inc(&skb->users); | |
471 | ireq6->pktopts = skb; | |
472 | } | |
473 | ireq6->iif = sk->sk_bound_dev_if; | |
474 | ||
475 | /* So that link locals have meaning */ | |
476 | if (!sk->sk_bound_dev_if && | |
477 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
478 | ireq6->iif = inet6_iif(skb); | |
479 | ||
45329e71 | 480 | /* |
3df80d93 ACM |
481 | * Step 3: Process LISTEN state |
482 | * | |
d83ca5ac | 483 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 484 | * |
d83ca5ac GR |
485 | * In fact we defer setting S.GSR, S.SWL, S.SWH to |
486 | * dccp_create_openreq_child. | |
3df80d93 ACM |
487 | */ |
488 | dreq = dccp_rsk(req); | |
489 | dreq->dreq_isr = dcb->dccpd_seq; | |
865e9022 | 490 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
3df80d93 ACM |
491 | dreq->dreq_service = service; |
492 | ||
493 | if (dccp_v6_send_response(sk, req, NULL)) | |
494 | goto drop_and_free; | |
495 | ||
496 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
497 | return 0; | |
498 | ||
499 | drop_and_free: | |
500 | reqsk_free(req); | |
501 | drop: | |
502 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
503 | dcb->dccpd_reset_code = reset_code; | |
504 | return -1; | |
505 | } | |
506 | ||
507 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
508 | struct sk_buff *skb, | |
509 | struct request_sock *req, | |
510 | struct dst_entry *dst) | |
511 | { | |
512 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
513 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
514 | struct inet_sock *newinet; | |
515 | struct dccp_sock *newdp; | |
516 | struct dccp6_sock *newdp6; | |
517 | struct sock *newsk; | |
518 | struct ipv6_txoptions *opt; | |
519 | ||
520 | if (skb->protocol == htons(ETH_P_IP)) { | |
521 | /* | |
522 | * v6 mapped | |
523 | */ | |
3df80d93 | 524 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 525 | if (newsk == NULL) |
3df80d93 ACM |
526 | return NULL; |
527 | ||
528 | newdp6 = (struct dccp6_sock *)newsk; | |
529 | newdp = dccp_sk(newsk); | |
530 | newinet = inet_sk(newsk); | |
531 | newinet->pinet6 = &newdp6->inet6; | |
532 | newnp = inet6_sk(newsk); | |
533 | ||
534 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
535 | ||
536 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), | |
537 | newinet->daddr); | |
538 | ||
539 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), | |
540 | newinet->saddr); | |
541 | ||
542 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
543 | ||
544 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
545 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
546 | newnp->pktoptions = NULL; | |
547 | newnp->opt = NULL; | |
548 | newnp->mcast_oif = inet6_iif(skb); | |
549 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
550 | ||
551 | /* | |
552 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
553 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
554 | * that function for the gory details. -acme | |
555 | */ | |
556 | ||
557 | /* It is tricky place. Until this moment IPv4 tcp | |
558 | worked with IPv6 icsk.icsk_af_ops. | |
559 | Sync it now. | |
560 | */ | |
d83d8461 | 561 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
562 | |
563 | return newsk; | |
564 | } | |
565 | ||
566 | opt = np->opt; | |
567 | ||
568 | if (sk_acceptq_is_full(sk)) | |
569 | goto out_overflow; | |
570 | ||
45329e71 ACM |
571 | if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) { |
572 | const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts); | |
573 | ||
3df80d93 ACM |
574 | if (rxopt->srcrt) |
575 | opt = ipv6_invert_rthdr(sk, | |
576 | (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw + | |
577 | rxopt->srcrt)); | |
578 | } | |
579 | ||
580 | if (dst == NULL) { | |
581 | struct in6_addr *final_p = NULL, final; | |
582 | struct flowi fl; | |
583 | ||
584 | memset(&fl, 0, sizeof(fl)); | |
585 | fl.proto = IPPROTO_DCCP; | |
586 | ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr); | |
45329e71 ACM |
587 | if (opt != NULL && opt->srcrt != NULL) { |
588 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt; | |
589 | ||
3df80d93 ACM |
590 | ipv6_addr_copy(&final, &fl.fl6_dst); |
591 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
592 | final_p = &final; | |
593 | } | |
594 | ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr); | |
595 | fl.oif = sk->sk_bound_dev_if; | |
596 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; | |
597 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
beb8d13b | 598 | security_sk_classify_flow(sk, &fl); |
3df80d93 ACM |
599 | |
600 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
601 | goto out; | |
602 | ||
603 | if (final_p) | |
604 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
605 | ||
606 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) | |
607 | goto out; | |
45329e71 | 608 | } |
3df80d93 ACM |
609 | |
610 | newsk = dccp_create_openreq_child(sk, req, skb); | |
611 | if (newsk == NULL) | |
612 | goto out; | |
613 | ||
614 | /* | |
615 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
616 | * count here, dccp_create_openreq_child now does this for us, see the | |
617 | * comment in that function for the gory details. -acme | |
618 | */ | |
619 | ||
8e1ef0a9 | 620 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
621 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
622 | NETIF_F_TSO); | |
3df80d93 ACM |
623 | newdp6 = (struct dccp6_sock *)newsk; |
624 | newinet = inet_sk(newsk); | |
625 | newinet->pinet6 = &newdp6->inet6; | |
626 | newdp = dccp_sk(newsk); | |
627 | newnp = inet6_sk(newsk); | |
628 | ||
629 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
630 | ||
631 | ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr); | |
632 | ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr); | |
633 | ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr); | |
634 | newsk->sk_bound_dev_if = ireq6->iif; | |
635 | ||
45329e71 | 636 | /* Now IPv6 options... |
3df80d93 ACM |
637 | |
638 | First: no IPv4 options. | |
639 | */ | |
640 | newinet->opt = NULL; | |
641 | ||
642 | /* Clone RX bits */ | |
643 | newnp->rxopt.all = np->rxopt.all; | |
644 | ||
645 | /* Clone pktoptions received with SYN */ | |
646 | newnp->pktoptions = NULL; | |
647 | if (ireq6->pktopts != NULL) { | |
648 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
649 | kfree_skb(ireq6->pktopts); | |
650 | ireq6->pktopts = NULL; | |
651 | if (newnp->pktoptions) | |
652 | skb_set_owner_r(newnp->pktoptions, newsk); | |
653 | } | |
654 | newnp->opt = NULL; | |
655 | newnp->mcast_oif = inet6_iif(skb); | |
656 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; | |
657 | ||
45329e71 ACM |
658 | /* |
659 | * Clone native IPv6 options from listening socket (if any) | |
660 | * | |
661 | * Yes, keeping reference count would be much more clever, but we make | |
662 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 663 | */ |
45329e71 | 664 | if (opt != NULL) { |
3df80d93 ACM |
665 | newnp->opt = ipv6_dup_options(newsk, opt); |
666 | if (opt != np->opt) | |
667 | sock_kfree_s(sk, opt, opt->tot_len); | |
668 | } | |
669 | ||
d83d8461 | 670 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 671 | if (newnp->opt != NULL) |
d83d8461 ACM |
672 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
673 | newnp->opt->opt_flen); | |
3df80d93 ACM |
674 | |
675 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
676 | ||
677 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; | |
678 | ||
679 | __inet6_hash(&dccp_hashinfo, newsk); | |
680 | inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
681 | ||
682 | return newsk; | |
683 | ||
684 | out_overflow: | |
685 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
686 | out: | |
687 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
45329e71 | 688 | if (opt != NULL && opt != np->opt) |
3df80d93 ACM |
689 | sock_kfree_s(sk, opt, opt->tot_len); |
690 | dst_release(dst); | |
691 | return NULL; | |
692 | } | |
693 | ||
694 | /* The socket must have it's spinlock held when we get | |
695 | * here. | |
696 | * | |
697 | * We have a potential double-lock case here, so even when | |
698 | * doing backlog processing we use the BH locking scheme. | |
699 | * This is because we cannot sleep with the original spinlock | |
700 | * held. | |
701 | */ | |
702 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
703 | { | |
704 | struct ipv6_pinfo *np = inet6_sk(sk); | |
705 | struct sk_buff *opt_skb = NULL; | |
706 | ||
707 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
708 | goes to IPv4 receive handler and backlogged. | |
709 | From backlog it always goes here. Kerboom... | |
710 | Fortunately, dccp_rcv_established and rcv_established | |
711 | handle them correctly, but it is not case with | |
712 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
713 | */ | |
714 | ||
715 | if (skb->protocol == htons(ETH_P_IP)) | |
716 | return dccp_v4_do_rcv(sk, skb); | |
717 | ||
fda9ef5d | 718 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
719 | goto discard; |
720 | ||
721 | /* | |
45329e71 ACM |
722 | * socket locking is here for SMP purposes as backlog rcv is currently |
723 | * called with bh processing disabled. | |
3df80d93 ACM |
724 | */ |
725 | ||
726 | /* Do Stevens' IPV6_PKTOPTIONS. | |
727 | ||
728 | Yes, guys, it is the only place in our code, where we | |
729 | may make it not affecting IPv4. | |
730 | The rest of code is protocol independent, | |
731 | and I do not like idea to uglify IPv4. | |
732 | ||
733 | Actually, all the idea behind IPV6_PKTOPTIONS | |
734 | looks not very well thought. For now we latch | |
735 | options, received in the last packet, enqueued | |
736 | by tcp. Feel free to propose better solution. | |
737 | --ANK (980728) | |
738 | */ | |
739 | if (np->rxopt.all) | |
89e7e577 GR |
740 | /* |
741 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
742 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
743 | */ | |
3df80d93 ACM |
744 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
745 | ||
746 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
747 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
748 | goto reset; | |
fd169f15 | 749 | if (opt_skb) { |
89e7e577 | 750 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
751 | __kfree_skb(opt_skb); |
752 | } | |
3df80d93 ACM |
753 | return 0; |
754 | } | |
755 | ||
d83ca5ac GR |
756 | /* |
757 | * Step 3: Process LISTEN state | |
758 | * If S.state == LISTEN, | |
759 | * If P.type == Request or P contains a valid Init Cookie option, | |
760 | * (* Must scan the packet's options to check for Init | |
761 | * Cookies. Only Init Cookies are processed here, | |
762 | * however; other options are processed in Step 8. This | |
763 | * scan need only be performed if the endpoint uses Init | |
764 | * Cookies *) | |
765 | * (* Generate a new socket and switch to that socket *) | |
766 | * Set S := new socket for this port pair | |
767 | * S.state = RESPOND | |
768 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
769 | * Initialize S.GAR := S.ISS | |
770 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
771 | * Continue with S.state == RESPOND | |
772 | * (* A Response packet will be generated in Step 11 *) | |
773 | * Otherwise, | |
774 | * Generate Reset(No Connection) unless P.type == Reset | |
775 | * Drop packet and return | |
776 | * | |
777 | * NOTE: the check for the packet types is done in | |
778 | * dccp_rcv_state_process | |
779 | */ | |
45329e71 | 780 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 781 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 782 | |
45329e71 ACM |
783 | if (nsk == NULL) |
784 | goto discard; | |
3df80d93 ACM |
785 | /* |
786 | * Queue it on the new socket if the new socket is active, | |
787 | * otherwise we just shortcircuit this and continue with | |
788 | * the new socket.. | |
789 | */ | |
45329e71 | 790 | if (nsk != sk) { |
3df80d93 ACM |
791 | if (dccp_child_process(sk, nsk, skb)) |
792 | goto reset; | |
45329e71 | 793 | if (opt_skb != NULL) |
3df80d93 ACM |
794 | __kfree_skb(opt_skb); |
795 | return 0; | |
796 | } | |
797 | } | |
798 | ||
799 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
800 | goto reset; | |
fd169f15 | 801 | if (opt_skb) { |
89e7e577 | 802 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
803 | __kfree_skb(opt_skb); |
804 | } | |
3df80d93 ACM |
805 | return 0; |
806 | ||
807 | reset: | |
808 | dccp_v6_ctl_send_reset(skb); | |
809 | discard: | |
45329e71 | 810 | if (opt_skb != NULL) |
3df80d93 ACM |
811 | __kfree_skb(opt_skb); |
812 | kfree_skb(skb); | |
813 | return 0; | |
814 | } | |
815 | ||
951dbc8a | 816 | static int dccp_v6_rcv(struct sk_buff **pskb) |
3df80d93 ACM |
817 | { |
818 | const struct dccp_hdr *dh; | |
819 | struct sk_buff *skb = *pskb; | |
820 | struct sock *sk; | |
6f4e5fff | 821 | int min_cov; |
3df80d93 | 822 | |
6f4e5fff | 823 | /* Step 1: Check header basics */ |
3df80d93 ACM |
824 | |
825 | if (dccp_invalid_packet(skb)) | |
826 | goto discard_it; | |
827 | ||
6f4e5fff GR |
828 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
829 | if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr, | |
830 | &skb->nh.ipv6h->daddr)) { | |
831 | LIMIT_NETDEBUG(KERN_WARNING | |
832 | "%s: dropped packet with invalid checksum\n", | |
833 | __FUNCTION__); | |
834 | goto discard_it; | |
835 | } | |
836 | ||
3df80d93 ACM |
837 | dh = dccp_hdr(skb); |
838 | ||
839 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); | |
840 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
841 | ||
842 | if (dccp_packet_without_ack(skb)) | |
843 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
844 | else | |
845 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
846 | ||
847 | /* Step 2: | |
848 | * Look up flow ID in table and get corresponding socket */ | |
849 | sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr, | |
850 | dh->dccph_sport, | |
851 | &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport), | |
852 | inet6_iif(skb)); | |
45329e71 | 853 | /* |
3df80d93 ACM |
854 | * Step 2: |
855 | * If no socket ... | |
3df80d93 | 856 | */ |
d23c7107 GR |
857 | if (sk == NULL) { |
858 | dccp_pr_debug("failed to look up flow ID in table and " | |
859 | "get corresponding socket\n"); | |
3df80d93 | 860 | goto no_dccp_socket; |
d23c7107 | 861 | } |
3df80d93 | 862 | |
45329e71 | 863 | /* |
3df80d93 ACM |
864 | * Step 2: |
865 | * ... or S.state == TIMEWAIT, | |
866 | * Generate Reset(No Connection) unless P.type == Reset | |
867 | * Drop packet and return | |
868 | */ | |
d23c7107 GR |
869 | if (sk->sk_state == DCCP_TIME_WAIT) { |
870 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
871 | inet_twsk_put(inet_twsk(sk)); | |
872 | goto no_dccp_socket; | |
873 | } | |
3df80d93 | 874 | |
6f4e5fff GR |
875 | /* |
876 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
877 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted | |
878 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
879 | */ | |
880 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
881 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
882 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
883 | dh->dccph_cscov, min_cov); | |
884 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
885 | goto discard_and_relse; | |
886 | } | |
887 | ||
3df80d93 ACM |
888 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
889 | goto discard_and_relse; | |
890 | ||
25995ff5 | 891 | return sk_receive_skb(sk, skb) ? -1 : 0; |
3df80d93 ACM |
892 | |
893 | no_dccp_socket: | |
894 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
895 | goto discard_it; | |
896 | /* | |
897 | * Step 2: | |
d83ca5ac | 898 | * If no socket ... |
3df80d93 ACM |
899 | * Generate Reset(No Connection) unless P.type == Reset |
900 | * Drop packet and return | |
901 | */ | |
902 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
903 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
904 | DCCP_RESET_CODE_NO_CONNECTION; | |
905 | dccp_v6_ctl_send_reset(skb); | |
906 | } | |
3df80d93 | 907 | |
d23c7107 | 908 | discard_it: |
3df80d93 ACM |
909 | kfree_skb(skb); |
910 | return 0; | |
911 | ||
912 | discard_and_relse: | |
913 | sock_put(sk); | |
914 | goto discard_it; | |
3df80d93 ACM |
915 | } |
916 | ||
73c9e02c GR |
917 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
918 | int addr_len) | |
919 | { | |
920 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
921 | struct inet_connection_sock *icsk = inet_csk(sk); | |
922 | struct inet_sock *inet = inet_sk(sk); | |
923 | struct ipv6_pinfo *np = inet6_sk(sk); | |
924 | struct dccp_sock *dp = dccp_sk(sk); | |
925 | struct in6_addr *saddr = NULL, *final_p = NULL, final; | |
926 | struct flowi fl; | |
927 | struct dst_entry *dst; | |
928 | int addr_type; | |
929 | int err; | |
930 | ||
931 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
932 | ||
933 | if (addr_len < SIN6_LEN_RFC2133) | |
934 | return -EINVAL; | |
935 | ||
936 | if (usin->sin6_family != AF_INET6) | |
937 | return -EAFNOSUPPORT; | |
938 | ||
939 | memset(&fl, 0, sizeof(fl)); | |
940 | ||
941 | if (np->sndflow) { | |
942 | fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; | |
943 | IP6_ECN_flow_init(fl.fl6_flowlabel); | |
944 | if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) { | |
945 | struct ip6_flowlabel *flowlabel; | |
946 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
947 | if (flowlabel == NULL) | |
948 | return -EINVAL; | |
949 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
950 | fl6_sock_release(flowlabel); | |
951 | } | |
952 | } | |
953 | /* | |
954 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
955 | */ | |
956 | if (ipv6_addr_any(&usin->sin6_addr)) | |
957 | usin->sin6_addr.s6_addr[15] = 1; | |
958 | ||
959 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
960 | ||
961 | if (addr_type & IPV6_ADDR_MULTICAST) | |
962 | return -ENETUNREACH; | |
963 | ||
964 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
965 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
966 | usin->sin6_scope_id) { | |
967 | /* If interface is set while binding, indices | |
968 | * must coincide. | |
969 | */ | |
970 | if (sk->sk_bound_dev_if && | |
971 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
972 | return -EINVAL; | |
973 | ||
974 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
975 | } | |
976 | ||
977 | /* Connect to link-local address requires an interface */ | |
978 | if (!sk->sk_bound_dev_if) | |
979 | return -EINVAL; | |
980 | } | |
981 | ||
982 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); | |
983 | np->flow_label = fl.fl6_flowlabel; | |
984 | ||
985 | /* | |
986 | * DCCP over IPv4 | |
987 | */ | |
988 | if (addr_type == IPV6_ADDR_MAPPED) { | |
989 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
990 | struct sockaddr_in sin; | |
991 | ||
992 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
993 | ||
994 | if (__ipv6_only_sock(sk)) | |
995 | return -ENETUNREACH; | |
996 | ||
997 | sin.sin_family = AF_INET; | |
998 | sin.sin_port = usin->sin6_port; | |
999 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
1000 | ||
1001 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
1002 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
1003 | ||
1004 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
1005 | if (err) { | |
1006 | icsk->icsk_ext_hdr_len = exthdrlen; | |
1007 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
1008 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
1009 | goto failure; | |
1010 | } else { | |
1011 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), | |
1012 | inet->saddr); | |
1013 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), | |
1014 | inet->rcv_saddr); | |
1015 | } | |
1016 | ||
1017 | return err; | |
1018 | } | |
1019 | ||
1020 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
1021 | saddr = &np->rcv_saddr; | |
1022 | ||
1023 | fl.proto = IPPROTO_DCCP; | |
1024 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
1025 | ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr); | |
1026 | fl.oif = sk->sk_bound_dev_if; | |
1027 | fl.fl_ip_dport = usin->sin6_port; | |
1028 | fl.fl_ip_sport = inet->sport; | |
1029 | security_sk_classify_flow(sk, &fl); | |
1030 | ||
1031 | if (np->opt != NULL && np->opt->srcrt != NULL) { | |
1032 | const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
1033 | ||
1034 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
1035 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1036 | final_p = &final; | |
1037 | } | |
1038 | ||
1039 | err = ip6_dst_lookup(sk, &dst, &fl); | |
1040 | if (err) | |
1041 | goto failure; | |
1042 | ||
1043 | if (final_p) | |
1044 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
1045 | ||
1046 | err = xfrm_lookup(&dst, &fl, sk, 0); | |
1047 | if (err < 0) | |
1048 | goto failure; | |
1049 | ||
1050 | if (saddr == NULL) { | |
1051 | saddr = &fl.fl6_src; | |
1052 | ipv6_addr_copy(&np->rcv_saddr, saddr); | |
1053 | } | |
1054 | ||
1055 | /* set the source address */ | |
1056 | ipv6_addr_copy(&np->saddr, saddr); | |
1057 | inet->rcv_saddr = LOOPBACK4_IPV6; | |
1058 | ||
1059 | __ip6_dst_store(sk, dst, NULL, NULL); | |
1060 | ||
1061 | icsk->icsk_ext_hdr_len = 0; | |
1062 | if (np->opt != NULL) | |
1063 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
1064 | np->opt->opt_nflen); | |
1065 | ||
1066 | inet->dport = usin->sin6_port; | |
1067 | ||
1068 | dccp_set_state(sk, DCCP_REQUESTING); | |
1069 | err = inet6_hash_connect(&dccp_death_row, sk); | |
1070 | if (err) | |
1071 | goto late_failure; | |
d7f7365f GR |
1072 | |
1073 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
1074 | np->daddr.s6_addr32, | |
1075 | inet->sport, inet->dport); | |
73c9e02c GR |
1076 | err = dccp_connect(sk); |
1077 | if (err) | |
1078 | goto late_failure; | |
1079 | ||
1080 | return 0; | |
1081 | ||
1082 | late_failure: | |
1083 | dccp_set_state(sk, DCCP_CLOSED); | |
1084 | __sk_dst_reset(sk); | |
1085 | failure: | |
1086 | inet->dport = 0; | |
1087 | sk->sk_route_caps = 0; | |
1088 | return err; | |
1089 | } | |
1090 | ||
3df80d93 | 1091 | static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1092 | .queue_xmit = inet6_csk_xmit, |
1093 | .send_check = dccp_v6_send_check, | |
1094 | .rebuild_header = inet6_sk_rebuild_header, | |
1095 | .conn_request = dccp_v6_conn_request, | |
1096 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1097 | .net_header_len = sizeof(struct ipv6hdr), | |
1098 | .setsockopt = ipv6_setsockopt, | |
1099 | .getsockopt = ipv6_getsockopt, | |
1100 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1101 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1102 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1103 | .compat_setsockopt = compat_ipv6_setsockopt, |
1104 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1105 | #endif |
3df80d93 ACM |
1106 | }; |
1107 | ||
1108 | /* | |
1109 | * DCCP over IPv4 via INET6 API | |
1110 | */ | |
1111 | static struct inet_connection_sock_af_ops dccp_ipv6_mapped = { | |
543d9cfe ACM |
1112 | .queue_xmit = ip_queue_xmit, |
1113 | .send_check = dccp_v4_send_check, | |
1114 | .rebuild_header = inet_sk_rebuild_header, | |
1115 | .conn_request = dccp_v6_conn_request, | |
1116 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1117 | .net_header_len = sizeof(struct iphdr), | |
1118 | .setsockopt = ipv6_setsockopt, | |
1119 | .getsockopt = ipv6_getsockopt, | |
1120 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1121 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1122 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1123 | .compat_setsockopt = compat_ipv6_setsockopt, |
1124 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1125 | #endif |
3df80d93 ACM |
1126 | }; |
1127 | ||
1128 | /* NOTE: A lot of things set to zero explicitly by call to | |
1129 | * sk_alloc() so need not be done here. | |
1130 | */ | |
1131 | static int dccp_v6_init_sock(struct sock *sk) | |
1132 | { | |
72478873 ACM |
1133 | static __u8 dccp_v6_ctl_sock_initialized; |
1134 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1135 | |
72478873 ACM |
1136 | if (err == 0) { |
1137 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1138 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1139 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1140 | } |
3df80d93 ACM |
1141 | |
1142 | return err; | |
1143 | } | |
1144 | ||
1145 | static int dccp_v6_destroy_sock(struct sock *sk) | |
1146 | { | |
3e0fadc5 | 1147 | dccp_destroy_sock(sk); |
3df80d93 ACM |
1148 | return inet6_destroy_sock(sk); |
1149 | } | |
1150 | ||
73c9e02c GR |
1151 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1152 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1153 | }; | |
1154 | ||
3df80d93 | 1155 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1156 | .name = "DCCPv6", |
1157 | .owner = THIS_MODULE, | |
1158 | .close = dccp_close, | |
1159 | .connect = dccp_v6_connect, | |
1160 | .disconnect = dccp_disconnect, | |
1161 | .ioctl = dccp_ioctl, | |
1162 | .init = dccp_v6_init_sock, | |
1163 | .setsockopt = dccp_setsockopt, | |
1164 | .getsockopt = dccp_getsockopt, | |
1165 | .sendmsg = dccp_sendmsg, | |
1166 | .recvmsg = dccp_recvmsg, | |
1167 | .backlog_rcv = dccp_v6_do_rcv, | |
1168 | .hash = dccp_v6_hash, | |
1169 | .unhash = dccp_unhash, | |
1170 | .accept = inet_csk_accept, | |
1171 | .get_port = dccp_v6_get_port, | |
1172 | .shutdown = dccp_shutdown, | |
1173 | .destroy = dccp_v6_destroy_sock, | |
1174 | .orphan_count = &dccp_orphan_count, | |
1175 | .max_header = MAX_DCCP_HEADER, | |
1176 | .obj_size = sizeof(struct dccp6_sock), | |
1177 | .rsk_prot = &dccp6_request_sock_ops, | |
1178 | .twsk_prot = &dccp6_timewait_sock_ops, | |
3fdadf7d | 1179 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1180 | .compat_setsockopt = compat_dccp_setsockopt, |
1181 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1182 | #endif |
3df80d93 ACM |
1183 | }; |
1184 | ||
1185 | static struct inet6_protocol dccp_v6_protocol = { | |
45329e71 ACM |
1186 | .handler = dccp_v6_rcv, |
1187 | .err_handler = dccp_v6_err, | |
1188 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1189 | }; |
1190 | ||
1191 | static struct proto_ops inet6_dccp_ops = { | |
543d9cfe ACM |
1192 | .family = PF_INET6, |
1193 | .owner = THIS_MODULE, | |
1194 | .release = inet6_release, | |
1195 | .bind = inet6_bind, | |
1196 | .connect = inet_stream_connect, | |
1197 | .socketpair = sock_no_socketpair, | |
1198 | .accept = inet_accept, | |
1199 | .getname = inet6_getname, | |
1200 | .poll = dccp_poll, | |
1201 | .ioctl = inet6_ioctl, | |
1202 | .listen = inet_dccp_listen, | |
1203 | .shutdown = inet_shutdown, | |
1204 | .setsockopt = sock_common_setsockopt, | |
1205 | .getsockopt = sock_common_getsockopt, | |
1206 | .sendmsg = inet_sendmsg, | |
1207 | .recvmsg = sock_common_recvmsg, | |
1208 | .mmap = sock_no_mmap, | |
1209 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1210 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1211 | .compat_setsockopt = compat_sock_common_setsockopt, |
1212 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1213 | #endif |
3df80d93 ACM |
1214 | }; |
1215 | ||
1216 | static struct inet_protosw dccp_v6_protosw = { | |
1217 | .type = SOCK_DCCP, | |
1218 | .protocol = IPPROTO_DCCP, | |
1219 | .prot = &dccp_v6_prot, | |
1220 | .ops = &inet6_dccp_ops, | |
1221 | .capability = -1, | |
d83d8461 | 1222 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1223 | }; |
1224 | ||
1225 | static int __init dccp_v6_init(void) | |
1226 | { | |
1227 | int err = proto_register(&dccp_v6_prot, 1); | |
1228 | ||
1229 | if (err != 0) | |
1230 | goto out; | |
1231 | ||
1232 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1233 | if (err != 0) | |
1234 | goto out_unregister_proto; | |
1235 | ||
1236 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1237 | |
c4d93909 ACM |
1238 | err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6, |
1239 | SOCK_DCCP, IPPROTO_DCCP); | |
1240 | if (err != 0) | |
72478873 | 1241 | goto out_unregister_protosw; |
3df80d93 ACM |
1242 | out: |
1243 | return err; | |
72478873 ACM |
1244 | out_unregister_protosw: |
1245 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1246 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1247 | out_unregister_proto: |
1248 | proto_unregister(&dccp_v6_prot); | |
1249 | goto out; | |
1250 | } | |
1251 | ||
1252 | static void __exit dccp_v6_exit(void) | |
1253 | { | |
1254 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1255 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1256 | proto_unregister(&dccp_v6_prot); | |
1257 | } | |
1258 | ||
1259 | module_init(dccp_v6_init); | |
1260 | module_exit(dccp_v6_exit); | |
1261 | ||
1262 | /* | |
1263 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1264 | * values directly, Also cover the case where the protocol is not specified, | |
1265 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1266 | */ | |
1267 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6"); | |
1268 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6"); | |
1269 | MODULE_LICENSE("GPL"); | |
1270 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1271 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |