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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
3df80d93 ACM |
18 | #include <linux/xfrm.h> |
19 | ||
20 | #include <net/addrconf.h> | |
21 | #include <net/inet_common.h> | |
22 | #include <net/inet_hashtables.h> | |
14c85021 | 23 | #include <net/inet_sock.h> |
3df80d93 ACM |
24 | #include <net/inet6_connection_sock.h> |
25 | #include <net/inet6_hashtables.h> | |
26 | #include <net/ip6_route.h> | |
27 | #include <net/ipv6.h> | |
28 | #include <net/protocol.h> | |
29 | #include <net/transp_v6.h> | |
aa0e4e4a | 30 | #include <net/ip6_checksum.h> |
3df80d93 | 31 | #include <net/xfrm.h> |
6e5714ea | 32 | #include <net/secure_seq.h> |
3df80d93 ACM |
33 | |
34 | #include "dccp.h" | |
35 | #include "ipv6.h" | |
4b79f0af | 36 | #include "feat.h" |
3df80d93 | 37 | |
13f51d82 | 38 | /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ |
72478873 | 39 | |
3b401a81 SH |
40 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
41 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
3df80d93 | 42 | |
3df80d93 ACM |
43 | static void dccp_v6_hash(struct sock *sk) |
44 | { | |
45 | if (sk->sk_state != DCCP_CLOSED) { | |
46 | if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) { | |
ab1e0a13 | 47 | inet_hash(sk); |
3df80d93 ACM |
48 | return; |
49 | } | |
50 | local_bh_disable(); | |
9327f705 | 51 | __inet6_hash(sk, NULL); |
3df80d93 ACM |
52 | local_bh_enable(); |
53 | } | |
54 | } | |
55 | ||
6f4e5fff | 56 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 57 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
b71d1d42 ED |
58 | const struct in6_addr *saddr, |
59 | const struct in6_addr *daddr) | |
3df80d93 | 60 | { |
6f4e5fff GR |
61 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
62 | } | |
63 | ||
bb296246 | 64 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
6f4e5fff GR |
65 | { |
66 | struct ipv6_pinfo *np = inet6_sk(sk); | |
67 | struct dccp_hdr *dh = dccp_hdr(skb); | |
68 | ||
69 | dccp_csum_outgoing(skb); | |
70 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr); | |
3df80d93 ACM |
71 | } |
72 | ||
6e5714ea | 73 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
d7f7365f | 74 | { |
0660e03f ACM |
75 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
76 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
77 | dccp_hdr(skb)->dccph_dport, |
78 | dccp_hdr(skb)->dccph_sport ); | |
79 | ||
3df80d93 ACM |
80 | } |
81 | ||
3df80d93 | 82 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 83 | u8 type, u8 code, int offset, __be32 info) |
3df80d93 | 84 | { |
b71d1d42 | 85 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
3df80d93 | 86 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); |
e0bcfb0c | 87 | struct dccp_sock *dp; |
3df80d93 ACM |
88 | struct ipv6_pinfo *np; |
89 | struct sock *sk; | |
90 | int err; | |
91 | __u64 seq; | |
ca12a1a4 | 92 | struct net *net = dev_net(skb->dev); |
3df80d93 | 93 | |
860239c5 WY |
94 | if (skb->len < offset + sizeof(*dh) || |
95 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
e41b5368 DL |
96 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
97 | ICMP6_MIB_INERRORS); | |
860239c5 WY |
98 | return; |
99 | } | |
100 | ||
ca12a1a4 | 101 | sk = inet6_lookup(net, &dccp_hashinfo, |
671a1c74 | 102 | &hdr->daddr, dh->dccph_dport, |
d86e0dac | 103 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
104 | |
105 | if (sk == NULL) { | |
e41b5368 DL |
106 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
107 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
108 | return; |
109 | } | |
110 | ||
111 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 112 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
113 | return; |
114 | } | |
115 | ||
116 | bh_lock_sock(sk); | |
117 | if (sock_owned_by_user(sk)) | |
de0744af | 118 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
119 | |
120 | if (sk->sk_state == DCCP_CLOSED) | |
121 | goto out; | |
122 | ||
e0bcfb0c WY |
123 | dp = dccp_sk(sk); |
124 | seq = dccp_hdr_seq(dh); | |
125 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && | |
126 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
127 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
128 | goto out; | |
129 | } | |
130 | ||
3df80d93 ACM |
131 | np = inet6_sk(sk); |
132 | ||
133 | if (type == ICMPV6_PKT_TOOBIG) { | |
3df80d93 ACM |
134 | struct dst_entry *dst = NULL; |
135 | ||
136 | if (sock_owned_by_user(sk)) | |
137 | goto out; | |
138 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
139 | goto out; | |
140 | ||
141 | /* icmp should have updated the destination cache entry */ | |
142 | dst = __sk_dst_check(sk, np->dst_cookie); | |
3df80d93 ACM |
143 | if (dst == NULL) { |
144 | struct inet_sock *inet = inet_sk(sk); | |
4c9483b2 | 145 | struct flowi6 fl6; |
3df80d93 ACM |
146 | |
147 | /* BUGGG_FUTURE: Again, it is not clear how | |
148 | to handle rthdr case. Ignore this complexity | |
149 | for now. | |
150 | */ | |
4c9483b2 DM |
151 | memset(&fl6, 0, sizeof(fl6)); |
152 | fl6.flowi6_proto = IPPROTO_DCCP; | |
4e3fd7a0 AD |
153 | fl6.daddr = np->daddr; |
154 | fl6.saddr = np->saddr; | |
4c9483b2 | 155 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
156 | fl6.fl6_dport = inet->inet_dport; |
157 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 DM |
158 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
159 | ||
160 | dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false); | |
68d0c6d3 DM |
161 | if (IS_ERR(dst)) { |
162 | sk->sk_err_soft = -PTR_ERR(dst); | |
3df80d93 ACM |
163 | goto out; |
164 | } | |
3df80d93 ACM |
165 | } else |
166 | dst_hold(dst); | |
167 | ||
d83d8461 | 168 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
3df80d93 ACM |
169 | dccp_sync_mss(sk, dst_mtu(dst)); |
170 | } /* else let the usual retransmit timer handle it */ | |
171 | dst_release(dst); | |
172 | goto out; | |
173 | } | |
174 | ||
175 | icmpv6_err_convert(type, code, &err); | |
176 | ||
3df80d93 ACM |
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 | 193 | */ |
547b792c | 194 | WARN_ON(req->sk != NULL); |
3df80d93 | 195 | |
f541fb7e SJ |
196 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
197 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 198 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
199 | goto out; |
200 | } | |
201 | ||
202 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
203 | goto out; | |
204 | ||
205 | case DCCP_REQUESTING: | |
206 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 207 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
208 | if (!sock_owned_by_user(sk)) { |
209 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
210 | sk->sk_err = err; | |
211 | /* | |
212 | * Wake people up to see the error | |
213 | * (see connect in sock.c) | |
214 | */ | |
215 | sk->sk_error_report(sk); | |
3df80d93 ACM |
216 | dccp_done(sk); |
217 | } else | |
218 | sk->sk_err_soft = err; | |
219 | goto out; | |
220 | } | |
221 | ||
222 | if (!sock_owned_by_user(sk) && np->recverr) { | |
223 | sk->sk_err = err; | |
224 | sk->sk_error_report(sk); | |
225 | } else | |
226 | sk->sk_err_soft = err; | |
227 | ||
228 | out: | |
229 | bh_unlock_sock(sk); | |
230 | sock_put(sk); | |
231 | } | |
232 | ||
233 | ||
e6b4d113 WAS |
234 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req, |
235 | struct request_values *rv_unused) | |
3df80d93 ACM |
236 | { |
237 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
238 | struct ipv6_pinfo *np = inet6_sk(sk); | |
239 | struct sk_buff *skb; | |
240 | struct ipv6_txoptions *opt = NULL; | |
20c59de2 | 241 | struct in6_addr *final_p, final; |
4c9483b2 | 242 | struct flowi6 fl6; |
3df80d93 | 243 | int err = -1; |
fd80eb94 | 244 | struct dst_entry *dst; |
3df80d93 | 245 | |
4c9483b2 DM |
246 | memset(&fl6, 0, sizeof(fl6)); |
247 | fl6.flowi6_proto = IPPROTO_DCCP; | |
4e3fd7a0 AD |
248 | fl6.daddr = ireq6->rmt_addr; |
249 | fl6.saddr = ireq6->loc_addr; | |
4c9483b2 DM |
250 | fl6.flowlabel = 0; |
251 | fl6.flowi6_oif = ireq6->iif; | |
1958b856 DM |
252 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
253 | fl6.fl6_sport = inet_rsk(req)->loc_port; | |
4c9483b2 | 254 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 255 | |
fd80eb94 | 256 | opt = np->opt; |
3df80d93 | 257 | |
4c9483b2 | 258 | final_p = fl6_update_dst(&fl6, opt, &final); |
3df80d93 | 259 | |
4c9483b2 | 260 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); |
68d0c6d3 DM |
261 | if (IS_ERR(dst)) { |
262 | err = PTR_ERR(dst); | |
263 | dst = NULL; | |
fd80eb94 | 264 | goto done; |
68d0c6d3 | 265 | } |
3df80d93 ACM |
266 | |
267 | skb = dccp_make_response(sk, dst, req); | |
268 | if (skb != NULL) { | |
269 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 270 | |
6f4e5fff GR |
271 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
272 | &ireq6->loc_addr, | |
273 | &ireq6->rmt_addr); | |
4e3fd7a0 | 274 | fl6.daddr = ireq6->rmt_addr; |
b903d324 | 275 | err = ip6_xmit(sk, skb, &fl6, opt, np->tclass); |
b9df3cb8 | 276 | err = net_xmit_eval(err); |
3df80d93 ACM |
277 | } |
278 | ||
279 | done: | |
45329e71 | 280 | if (opt != NULL && opt != np->opt) |
3df80d93 | 281 | sock_kfree_s(sk, opt, opt->tot_len); |
0cbd7825 | 282 | dst_release(dst); |
3df80d93 ACM |
283 | return err; |
284 | } | |
285 | ||
286 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
287 | { | |
d99a7bd2 | 288 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3df80d93 ACM |
289 | if (inet6_rsk(req)->pktopts != NULL) |
290 | kfree_skb(inet6_rsk(req)->pktopts); | |
291 | } | |
292 | ||
cfb6eeb4 | 293 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 294 | { |
b71d1d42 | 295 | const struct ipv6hdr *rxip6h; |
3df80d93 | 296 | struct sk_buff *skb; |
4c9483b2 | 297 | struct flowi6 fl6; |
adf30907 | 298 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 299 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 300 | struct dst_entry *dst; |
3df80d93 | 301 | |
e356d37a | 302 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
303 | return; |
304 | ||
305 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 306 | return; |
3df80d93 | 307 | |
02047741 | 308 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 309 | if (skb == NULL) |
8109b02b | 310 | return; |
3df80d93 | 311 | |
0660e03f | 312 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
313 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
314 | &rxip6h->daddr); | |
6f4e5fff | 315 | |
4c9483b2 | 316 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
317 | fl6.daddr = rxip6h->saddr; |
318 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 319 | |
4c9483b2 DM |
320 | fl6.flowi6_proto = IPPROTO_DCCP; |
321 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
322 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
323 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 324 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
325 | |
326 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
4c9483b2 | 327 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
328 | if (!IS_ERR(dst)) { |
329 | skb_dst_set(skb, dst); | |
b903d324 | 330 | ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); |
68d0c6d3 DM |
331 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
332 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
333 | return; | |
3df80d93 ACM |
334 | } |
335 | ||
336 | kfree_skb(skb); | |
337 | } | |
338 | ||
73c9e02c GR |
339 | static struct request_sock_ops dccp6_request_sock_ops = { |
340 | .family = AF_INET6, | |
341 | .obj_size = sizeof(struct dccp6_request_sock), | |
342 | .rtx_syn_ack = dccp_v6_send_response, | |
343 | .send_ack = dccp_reqsk_send_ack, | |
344 | .destructor = dccp_v6_reqsk_destructor, | |
345 | .send_reset = dccp_v6_ctl_send_reset, | |
346 | }; | |
347 | ||
3df80d93 ACM |
348 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
349 | { | |
350 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 351 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
352 | struct sock *nsk; |
353 | struct request_sock **prev; | |
354 | /* Find possible connection requests. */ | |
355 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
356 | dh->dccph_sport, | |
357 | &iph->saddr, | |
358 | &iph->daddr, | |
359 | inet6_iif(skb)); | |
360 | if (req != NULL) | |
361 | return dccp_check_req(sk, skb, req, prev); | |
362 | ||
671a1c74 | 363 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
364 | &iph->saddr, dh->dccph_sport, |
365 | &iph->daddr, ntohs(dh->dccph_dport), | |
366 | inet6_iif(skb)); | |
3df80d93 ACM |
367 | if (nsk != NULL) { |
368 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
369 | bh_lock_sock(nsk); | |
370 | return nsk; | |
371 | } | |
9469c7b4 | 372 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
373 | return NULL; |
374 | } | |
375 | ||
376 | return sk; | |
377 | } | |
378 | ||
379 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
380 | { | |
3df80d93 ACM |
381 | struct request_sock *req; |
382 | struct dccp_request_sock *dreq; | |
383 | struct inet6_request_sock *ireq6; | |
384 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 385 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 386 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
387 | |
388 | if (skb->protocol == htons(ETH_P_IP)) | |
389 | return dccp_v4_conn_request(sk, skb); | |
390 | ||
391 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 392 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
393 | |
394 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 395 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 396 | goto drop; |
8109b02b | 397 | } |
3df80d93 | 398 | /* |
45329e71 | 399 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 400 | */ |
4a5409a5 | 401 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 402 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 403 | goto drop; |
3df80d93 ACM |
404 | |
405 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
406 | goto drop; | |
407 | ||
82709531 | 408 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
409 | if (req == NULL) |
410 | goto drop; | |
411 | ||
ac75773c GR |
412 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
413 | goto drop_and_free; | |
3df80d93 | 414 | |
8b819412 GR |
415 | dreq = dccp_rsk(req); |
416 | if (dccp_parse_options(sk, dreq, skb)) | |
417 | goto drop_and_free; | |
418 | ||
4237c75c VY |
419 | if (security_inet_conn_request(sk, skb, req)) |
420 | goto drop_and_free; | |
421 | ||
3df80d93 | 422 | ireq6 = inet6_rsk(req); |
4e3fd7a0 AD |
423 | ireq6->rmt_addr = ipv6_hdr(skb)->saddr; |
424 | ireq6->loc_addr = ipv6_hdr(skb)->daddr; | |
3df80d93 ACM |
425 | |
426 | if (ipv6_opt_accepted(sk, skb) || | |
427 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
428 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
429 | atomic_inc(&skb->users); | |
430 | ireq6->pktopts = skb; | |
431 | } | |
432 | ireq6->iif = sk->sk_bound_dev_if; | |
433 | ||
434 | /* So that link locals have meaning */ | |
435 | if (!sk->sk_bound_dev_if && | |
436 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
437 | ireq6->iif = inet6_iif(skb); | |
438 | ||
45329e71 | 439 | /* |
3df80d93 ACM |
440 | * Step 3: Process LISTEN state |
441 | * | |
d83ca5ac | 442 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 443 | * |
f541fb7e | 444 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 445 | */ |
3df80d93 | 446 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 447 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 448 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 449 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
450 | dreq->dreq_service = service; |
451 | ||
e6b4d113 | 452 | if (dccp_v6_send_response(sk, req, NULL)) |
3df80d93 ACM |
453 | goto drop_and_free; |
454 | ||
455 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
456 | return 0; | |
457 | ||
458 | drop_and_free: | |
459 | reqsk_free(req); | |
460 | drop: | |
461 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
462 | return -1; |
463 | } | |
464 | ||
465 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
466 | struct sk_buff *skb, | |
467 | struct request_sock *req, | |
468 | struct dst_entry *dst) | |
469 | { | |
470 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
471 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
472 | struct inet_sock *newinet; | |
3df80d93 ACM |
473 | struct dccp6_sock *newdp6; |
474 | struct sock *newsk; | |
475 | struct ipv6_txoptions *opt; | |
476 | ||
477 | if (skb->protocol == htons(ETH_P_IP)) { | |
478 | /* | |
479 | * v6 mapped | |
480 | */ | |
3df80d93 | 481 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 482 | if (newsk == NULL) |
3df80d93 ACM |
483 | return NULL; |
484 | ||
485 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
486 | newinet = inet_sk(newsk); |
487 | newinet->pinet6 = &newdp6->inet6; | |
488 | newnp = inet6_sk(newsk); | |
489 | ||
490 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
491 | ||
c720c7e8 | 492 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
3df80d93 | 493 | |
c720c7e8 | 494 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
3df80d93 | 495 | |
4e3fd7a0 | 496 | newnp->rcv_saddr = newnp->saddr; |
3df80d93 ACM |
497 | |
498 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
499 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
500 | newnp->pktoptions = NULL; | |
501 | newnp->opt = NULL; | |
502 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 503 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
504 | |
505 | /* | |
506 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
507 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
508 | * that function for the gory details. -acme | |
509 | */ | |
510 | ||
511 | /* It is tricky place. Until this moment IPv4 tcp | |
512 | worked with IPv6 icsk.icsk_af_ops. | |
513 | Sync it now. | |
514 | */ | |
d83d8461 | 515 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
516 | |
517 | return newsk; | |
518 | } | |
519 | ||
520 | opt = np->opt; | |
521 | ||
522 | if (sk_acceptq_is_full(sk)) | |
523 | goto out_overflow; | |
524 | ||
3df80d93 | 525 | if (dst == NULL) { |
20c59de2 | 526 | struct in6_addr *final_p, final; |
4c9483b2 DM |
527 | struct flowi6 fl6; |
528 | ||
529 | memset(&fl6, 0, sizeof(fl6)); | |
530 | fl6.flowi6_proto = IPPROTO_DCCP; | |
4e3fd7a0 | 531 | fl6.daddr = ireq6->rmt_addr; |
4c9483b2 | 532 | final_p = fl6_update_dst(&fl6, opt, &final); |
4e3fd7a0 | 533 | fl6.saddr = ireq6->loc_addr; |
4c9483b2 | 534 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
535 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
536 | fl6.fl6_sport = inet_rsk(req)->loc_port; | |
4c9483b2 DM |
537 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
538 | ||
539 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); | |
68d0c6d3 | 540 | if (IS_ERR(dst)) |
3df80d93 | 541 | goto out; |
45329e71 | 542 | } |
3df80d93 ACM |
543 | |
544 | newsk = dccp_create_openreq_child(sk, req, skb); | |
545 | if (newsk == NULL) | |
093d2823 | 546 | goto out_nonewsk; |
3df80d93 ACM |
547 | |
548 | /* | |
549 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
550 | * count here, dccp_create_openreq_child now does this for us, see the | |
551 | * comment in that function for the gory details. -acme | |
552 | */ | |
553 | ||
8e1ef0a9 | 554 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
555 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
556 | NETIF_F_TSO); | |
3df80d93 ACM |
557 | newdp6 = (struct dccp6_sock *)newsk; |
558 | newinet = inet_sk(newsk); | |
559 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
560 | newnp = inet6_sk(newsk); |
561 | ||
562 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
563 | ||
4e3fd7a0 AD |
564 | newnp->daddr = ireq6->rmt_addr; |
565 | newnp->saddr = ireq6->loc_addr; | |
566 | newnp->rcv_saddr = ireq6->loc_addr; | |
3df80d93 ACM |
567 | newsk->sk_bound_dev_if = ireq6->iif; |
568 | ||
45329e71 | 569 | /* Now IPv6 options... |
3df80d93 ACM |
570 | |
571 | First: no IPv4 options. | |
572 | */ | |
f6d8bd05 | 573 | newinet->inet_opt = NULL; |
3df80d93 ACM |
574 | |
575 | /* Clone RX bits */ | |
576 | newnp->rxopt.all = np->rxopt.all; | |
577 | ||
578 | /* Clone pktoptions received with SYN */ | |
579 | newnp->pktoptions = NULL; | |
580 | if (ireq6->pktopts != NULL) { | |
581 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
582 | kfree_skb(ireq6->pktopts); | |
583 | ireq6->pktopts = NULL; | |
584 | if (newnp->pktoptions) | |
585 | skb_set_owner_r(newnp->pktoptions, newsk); | |
586 | } | |
587 | newnp->opt = NULL; | |
588 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 589 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 590 | |
45329e71 ACM |
591 | /* |
592 | * Clone native IPv6 options from listening socket (if any) | |
593 | * | |
594 | * Yes, keeping reference count would be much more clever, but we make | |
595 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 596 | */ |
45329e71 | 597 | if (opt != NULL) { |
3df80d93 ACM |
598 | newnp->opt = ipv6_dup_options(newsk, opt); |
599 | if (opt != np->opt) | |
600 | sock_kfree_s(sk, opt, opt->tot_len); | |
601 | } | |
602 | ||
d83d8461 | 603 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 604 | if (newnp->opt != NULL) |
d83d8461 ACM |
605 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
606 | newnp->opt->opt_flen); | |
3df80d93 ACM |
607 | |
608 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
609 | ||
c720c7e8 ED |
610 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
611 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 612 | |
093d2823 BS |
613 | if (__inet_inherit_port(sk, newsk) < 0) { |
614 | sock_put(newsk); | |
615 | goto out; | |
616 | } | |
9327f705 | 617 | __inet6_hash(newsk, NULL); |
3df80d93 ACM |
618 | |
619 | return newsk; | |
620 | ||
621 | out_overflow: | |
de0744af | 622 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
623 | out_nonewsk: |
624 | dst_release(dst); | |
3df80d93 | 625 | out: |
de0744af | 626 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
45329e71 | 627 | if (opt != NULL && opt != np->opt) |
3df80d93 | 628 | sock_kfree_s(sk, opt, opt->tot_len); |
3df80d93 ACM |
629 | return NULL; |
630 | } | |
631 | ||
632 | /* The socket must have it's spinlock held when we get | |
633 | * here. | |
634 | * | |
635 | * We have a potential double-lock case here, so even when | |
636 | * doing backlog processing we use the BH locking scheme. | |
637 | * This is because we cannot sleep with the original spinlock | |
638 | * held. | |
639 | */ | |
640 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
641 | { | |
642 | struct ipv6_pinfo *np = inet6_sk(sk); | |
643 | struct sk_buff *opt_skb = NULL; | |
644 | ||
645 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
646 | goes to IPv4 receive handler and backlogged. | |
647 | From backlog it always goes here. Kerboom... | |
648 | Fortunately, dccp_rcv_established and rcv_established | |
649 | handle them correctly, but it is not case with | |
650 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
651 | */ | |
652 | ||
653 | if (skb->protocol == htons(ETH_P_IP)) | |
654 | return dccp_v4_do_rcv(sk, skb); | |
655 | ||
fda9ef5d | 656 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
657 | goto discard; |
658 | ||
659 | /* | |
45329e71 ACM |
660 | * socket locking is here for SMP purposes as backlog rcv is currently |
661 | * called with bh processing disabled. | |
3df80d93 ACM |
662 | */ |
663 | ||
664 | /* Do Stevens' IPV6_PKTOPTIONS. | |
665 | ||
666 | Yes, guys, it is the only place in our code, where we | |
667 | may make it not affecting IPv4. | |
668 | The rest of code is protocol independent, | |
669 | and I do not like idea to uglify IPv4. | |
670 | ||
671 | Actually, all the idea behind IPV6_PKTOPTIONS | |
672 | looks not very well thought. For now we latch | |
673 | options, received in the last packet, enqueued | |
674 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 675 | --ANK (980728) |
3df80d93 ACM |
676 | */ |
677 | if (np->rxopt.all) | |
89e7e577 GR |
678 | /* |
679 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
680 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
681 | */ | |
3df80d93 ACM |
682 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
683 | ||
684 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
685 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
686 | goto reset; | |
fd169f15 | 687 | if (opt_skb) { |
89e7e577 | 688 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
689 | __kfree_skb(opt_skb); |
690 | } | |
3df80d93 ACM |
691 | return 0; |
692 | } | |
693 | ||
d83ca5ac GR |
694 | /* |
695 | * Step 3: Process LISTEN state | |
696 | * If S.state == LISTEN, | |
697 | * If P.type == Request or P contains a valid Init Cookie option, | |
698 | * (* Must scan the packet's options to check for Init | |
699 | * Cookies. Only Init Cookies are processed here, | |
700 | * however; other options are processed in Step 8. This | |
701 | * scan need only be performed if the endpoint uses Init | |
702 | * Cookies *) | |
703 | * (* Generate a new socket and switch to that socket *) | |
704 | * Set S := new socket for this port pair | |
705 | * S.state = RESPOND | |
706 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
707 | * Initialize S.GAR := S.ISS | |
708 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
709 | * Continue with S.state == RESPOND | |
710 | * (* A Response packet will be generated in Step 11 *) | |
711 | * Otherwise, | |
712 | * Generate Reset(No Connection) unless P.type == Reset | |
713 | * Drop packet and return | |
714 | * | |
715 | * NOTE: the check for the packet types is done in | |
716 | * dccp_rcv_state_process | |
717 | */ | |
45329e71 | 718 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 719 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 720 | |
45329e71 ACM |
721 | if (nsk == NULL) |
722 | goto discard; | |
3df80d93 ACM |
723 | /* |
724 | * Queue it on the new socket if the new socket is active, | |
725 | * otherwise we just shortcircuit this and continue with | |
726 | * the new socket.. | |
727 | */ | |
8109b02b | 728 | if (nsk != sk) { |
3df80d93 ACM |
729 | if (dccp_child_process(sk, nsk, skb)) |
730 | goto reset; | |
45329e71 | 731 | if (opt_skb != NULL) |
3df80d93 ACM |
732 | __kfree_skb(opt_skb); |
733 | return 0; | |
734 | } | |
735 | } | |
736 | ||
737 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
738 | goto reset; | |
fd169f15 | 739 | if (opt_skb) { |
89e7e577 | 740 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
741 | __kfree_skb(opt_skb); |
742 | } | |
3df80d93 ACM |
743 | return 0; |
744 | ||
745 | reset: | |
cfb6eeb4 | 746 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 747 | discard: |
45329e71 | 748 | if (opt_skb != NULL) |
3df80d93 ACM |
749 | __kfree_skb(opt_skb); |
750 | kfree_skb(skb); | |
751 | return 0; | |
752 | } | |
753 | ||
e5bbef20 | 754 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
755 | { |
756 | const struct dccp_hdr *dh; | |
3df80d93 | 757 | struct sock *sk; |
6f4e5fff | 758 | int min_cov; |
3df80d93 | 759 | |
6f4e5fff | 760 | /* Step 1: Check header basics */ |
3df80d93 ACM |
761 | |
762 | if (dccp_invalid_packet(skb)) | |
763 | goto discard_it; | |
764 | ||
6f4e5fff | 765 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
766 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
767 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 768 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
769 | goto discard_it; |
770 | } | |
771 | ||
3df80d93 ACM |
772 | dh = dccp_hdr(skb); |
773 | ||
fde20105 | 774 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
775 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
776 | ||
777 | if (dccp_packet_without_ack(skb)) | |
778 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
779 | else | |
780 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
781 | ||
782 | /* Step 2: | |
8109b02b | 783 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
784 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
785 | dh->dccph_sport, dh->dccph_dport); | |
45329e71 | 786 | /* |
3df80d93 | 787 | * Step 2: |
8109b02b | 788 | * If no socket ... |
3df80d93 | 789 | */ |
d23c7107 GR |
790 | if (sk == NULL) { |
791 | dccp_pr_debug("failed to look up flow ID in table and " | |
792 | "get corresponding socket\n"); | |
3df80d93 | 793 | goto no_dccp_socket; |
d23c7107 | 794 | } |
3df80d93 | 795 | |
45329e71 | 796 | /* |
3df80d93 | 797 | * Step 2: |
8109b02b | 798 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
799 | * Generate Reset(No Connection) unless P.type == Reset |
800 | * Drop packet and return | |
801 | */ | |
d23c7107 GR |
802 | if (sk->sk_state == DCCP_TIME_WAIT) { |
803 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
804 | inet_twsk_put(inet_twsk(sk)); | |
805 | goto no_dccp_socket; | |
806 | } | |
3df80d93 | 807 | |
6f4e5fff GR |
808 | /* |
809 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
810 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
811 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
812 | */ |
813 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
814 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
815 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
816 | dh->dccph_cscov, min_cov); | |
817 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
818 | goto discard_and_relse; | |
819 | } | |
820 | ||
3df80d93 ACM |
821 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
822 | goto discard_and_relse; | |
823 | ||
58a5a7b9 | 824 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
825 | |
826 | no_dccp_socket: | |
827 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
828 | goto discard_it; | |
829 | /* | |
830 | * Step 2: | |
8109b02b | 831 | * If no socket ... |
3df80d93 ACM |
832 | * Generate Reset(No Connection) unless P.type == Reset |
833 | * Drop packet and return | |
834 | */ | |
835 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
836 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
837 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 838 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 839 | } |
3df80d93 | 840 | |
d23c7107 | 841 | discard_it: |
3df80d93 ACM |
842 | kfree_skb(skb); |
843 | return 0; | |
844 | ||
845 | discard_and_relse: | |
846 | sock_put(sk); | |
847 | goto discard_it; | |
3df80d93 ACM |
848 | } |
849 | ||
73c9e02c GR |
850 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
851 | int addr_len) | |
852 | { | |
853 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
854 | struct inet_connection_sock *icsk = inet_csk(sk); | |
855 | struct inet_sock *inet = inet_sk(sk); | |
856 | struct ipv6_pinfo *np = inet6_sk(sk); | |
857 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 858 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 859 | struct flowi6 fl6; |
73c9e02c GR |
860 | struct dst_entry *dst; |
861 | int addr_type; | |
862 | int err; | |
863 | ||
864 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
865 | ||
866 | if (addr_len < SIN6_LEN_RFC2133) | |
867 | return -EINVAL; | |
868 | ||
869 | if (usin->sin6_family != AF_INET6) | |
870 | return -EAFNOSUPPORT; | |
871 | ||
4c9483b2 | 872 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
873 | |
874 | if (np->sndflow) { | |
4c9483b2 DM |
875 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
876 | IP6_ECN_flow_init(fl6.flowlabel); | |
877 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 878 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 879 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
880 | if (flowlabel == NULL) |
881 | return -EINVAL; | |
4e3fd7a0 | 882 | usin->sin6_addr = flowlabel->dst; |
73c9e02c GR |
883 | fl6_sock_release(flowlabel); |
884 | } | |
885 | } | |
886 | /* | |
887 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
888 | */ | |
889 | if (ipv6_addr_any(&usin->sin6_addr)) | |
890 | usin->sin6_addr.s6_addr[15] = 1; | |
891 | ||
892 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
893 | ||
894 | if (addr_type & IPV6_ADDR_MULTICAST) | |
895 | return -ENETUNREACH; | |
896 | ||
897 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
898 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
899 | usin->sin6_scope_id) { | |
900 | /* If interface is set while binding, indices | |
901 | * must coincide. | |
902 | */ | |
903 | if (sk->sk_bound_dev_if && | |
904 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
905 | return -EINVAL; | |
906 | ||
907 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
908 | } | |
909 | ||
910 | /* Connect to link-local address requires an interface */ | |
911 | if (!sk->sk_bound_dev_if) | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
4e3fd7a0 | 915 | np->daddr = usin->sin6_addr; |
4c9483b2 | 916 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
917 | |
918 | /* | |
919 | * DCCP over IPv4 | |
920 | */ | |
921 | if (addr_type == IPV6_ADDR_MAPPED) { | |
922 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
923 | struct sockaddr_in sin; | |
924 | ||
925 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
926 | ||
927 | if (__ipv6_only_sock(sk)) | |
928 | return -ENETUNREACH; | |
929 | ||
930 | sin.sin_family = AF_INET; | |
931 | sin.sin_port = usin->sin6_port; | |
932 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
933 | ||
934 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
935 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
936 | ||
937 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
938 | if (err) { | |
939 | icsk->icsk_ext_hdr_len = exthdrlen; | |
940 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
941 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
942 | goto failure; | |
73c9e02c | 943 | } |
c720c7e8 ED |
944 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
945 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr); | |
73c9e02c GR |
946 | |
947 | return err; | |
948 | } | |
949 | ||
950 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
951 | saddr = &np->rcv_saddr; | |
952 | ||
4c9483b2 | 953 | fl6.flowi6_proto = IPPROTO_DCCP; |
4e3fd7a0 AD |
954 | fl6.daddr = np->daddr; |
955 | fl6.saddr = saddr ? *saddr : np->saddr; | |
4c9483b2 | 956 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
957 | fl6.fl6_dport = usin->sin6_port; |
958 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 959 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 960 | |
4c9483b2 | 961 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 962 | |
4c9483b2 | 963 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
964 | if (IS_ERR(dst)) { |
965 | err = PTR_ERR(dst); | |
73c9e02c | 966 | goto failure; |
14e50e57 | 967 | } |
73c9e02c GR |
968 | |
969 | if (saddr == NULL) { | |
4c9483b2 | 970 | saddr = &fl6.saddr; |
4e3fd7a0 | 971 | np->rcv_saddr = *saddr; |
73c9e02c GR |
972 | } |
973 | ||
974 | /* set the source address */ | |
4e3fd7a0 | 975 | np->saddr = *saddr; |
c720c7e8 | 976 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
977 | |
978 | __ip6_dst_store(sk, dst, NULL, NULL); | |
979 | ||
980 | icsk->icsk_ext_hdr_len = 0; | |
981 | if (np->opt != NULL) | |
982 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
983 | np->opt->opt_nflen); | |
984 | ||
c720c7e8 | 985 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
986 | |
987 | dccp_set_state(sk, DCCP_REQUESTING); | |
988 | err = inet6_hash_connect(&dccp_death_row, sk); | |
989 | if (err) | |
990 | goto late_failure; | |
d7f7365f GR |
991 | |
992 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
993 | np->daddr.s6_addr32, | |
c720c7e8 ED |
994 | inet->inet_sport, |
995 | inet->inet_dport); | |
73c9e02c GR |
996 | err = dccp_connect(sk); |
997 | if (err) | |
998 | goto late_failure; | |
999 | ||
1000 | return 0; | |
1001 | ||
1002 | late_failure: | |
1003 | dccp_set_state(sk, DCCP_CLOSED); | |
1004 | __sk_dst_reset(sk); | |
1005 | failure: | |
c720c7e8 | 1006 | inet->inet_dport = 0; |
73c9e02c GR |
1007 | sk->sk_route_caps = 0; |
1008 | return err; | |
1009 | } | |
1010 | ||
3b401a81 | 1011 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
1012 | .queue_xmit = inet6_csk_xmit, |
1013 | .send_check = dccp_v6_send_check, | |
1014 | .rebuild_header = inet6_sk_rebuild_header, | |
1015 | .conn_request = dccp_v6_conn_request, | |
1016 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1017 | .net_header_len = sizeof(struct ipv6hdr), | |
1018 | .setsockopt = ipv6_setsockopt, | |
1019 | .getsockopt = ipv6_getsockopt, | |
1020 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1021 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1022 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1023 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1024 | .compat_setsockopt = compat_ipv6_setsockopt, |
1025 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1026 | #endif |
3df80d93 ACM |
1027 | }; |
1028 | ||
1029 | /* | |
1030 | * DCCP over IPv4 via INET6 API | |
1031 | */ | |
3b401a81 | 1032 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
1033 | .queue_xmit = ip_queue_xmit, |
1034 | .send_check = dccp_v4_send_check, | |
1035 | .rebuild_header = inet_sk_rebuild_header, | |
1036 | .conn_request = dccp_v6_conn_request, | |
1037 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1038 | .net_header_len = sizeof(struct iphdr), | |
1039 | .setsockopt = ipv6_setsockopt, | |
1040 | .getsockopt = ipv6_getsockopt, | |
1041 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1042 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1043 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1044 | .compat_setsockopt = compat_ipv6_setsockopt, |
1045 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1046 | #endif |
3df80d93 ACM |
1047 | }; |
1048 | ||
1049 | /* NOTE: A lot of things set to zero explicitly by call to | |
1050 | * sk_alloc() so need not be done here. | |
1051 | */ | |
1052 | static int dccp_v6_init_sock(struct sock *sk) | |
1053 | { | |
72478873 ACM |
1054 | static __u8 dccp_v6_ctl_sock_initialized; |
1055 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1056 | |
72478873 ACM |
1057 | if (err == 0) { |
1058 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1059 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1060 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1061 | } |
3df80d93 ACM |
1062 | |
1063 | return err; | |
1064 | } | |
1065 | ||
7d06b2e0 | 1066 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1067 | { |
3e0fadc5 | 1068 | dccp_destroy_sock(sk); |
7d06b2e0 | 1069 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1070 | } |
1071 | ||
73c9e02c GR |
1072 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1073 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1074 | }; | |
1075 | ||
3df80d93 | 1076 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1077 | .name = "DCCPv6", |
1078 | .owner = THIS_MODULE, | |
1079 | .close = dccp_close, | |
1080 | .connect = dccp_v6_connect, | |
1081 | .disconnect = dccp_disconnect, | |
1082 | .ioctl = dccp_ioctl, | |
1083 | .init = dccp_v6_init_sock, | |
1084 | .setsockopt = dccp_setsockopt, | |
1085 | .getsockopt = dccp_getsockopt, | |
1086 | .sendmsg = dccp_sendmsg, | |
1087 | .recvmsg = dccp_recvmsg, | |
1088 | .backlog_rcv = dccp_v6_do_rcv, | |
1089 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1090 | .unhash = inet_unhash, |
543d9cfe | 1091 | .accept = inet_csk_accept, |
ab1e0a13 | 1092 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1093 | .shutdown = dccp_shutdown, |
1094 | .destroy = dccp_v6_destroy_sock, | |
1095 | .orphan_count = &dccp_orphan_count, | |
1096 | .max_header = MAX_DCCP_HEADER, | |
1097 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1098 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1099 | .rsk_prot = &dccp6_request_sock_ops, |
1100 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1101 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1102 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1103 | .compat_setsockopt = compat_dccp_setsockopt, |
1104 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1105 | #endif |
3df80d93 ACM |
1106 | }; |
1107 | ||
41135cc8 | 1108 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1109 | .handler = dccp_v6_rcv, |
1110 | .err_handler = dccp_v6_err, | |
1111 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1112 | }; |
1113 | ||
5708e868 | 1114 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1115 | .family = PF_INET6, |
1116 | .owner = THIS_MODULE, | |
1117 | .release = inet6_release, | |
1118 | .bind = inet6_bind, | |
1119 | .connect = inet_stream_connect, | |
1120 | .socketpair = sock_no_socketpair, | |
1121 | .accept = inet_accept, | |
1122 | .getname = inet6_getname, | |
1123 | .poll = dccp_poll, | |
1124 | .ioctl = inet6_ioctl, | |
1125 | .listen = inet_dccp_listen, | |
1126 | .shutdown = inet_shutdown, | |
1127 | .setsockopt = sock_common_setsockopt, | |
1128 | .getsockopt = sock_common_getsockopt, | |
1129 | .sendmsg = inet_sendmsg, | |
1130 | .recvmsg = sock_common_recvmsg, | |
1131 | .mmap = sock_no_mmap, | |
1132 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1133 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1134 | .compat_setsockopt = compat_sock_common_setsockopt, |
1135 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1136 | #endif |
3df80d93 ACM |
1137 | }; |
1138 | ||
1139 | static struct inet_protosw dccp_v6_protosw = { | |
1140 | .type = SOCK_DCCP, | |
1141 | .protocol = IPPROTO_DCCP, | |
1142 | .prot = &dccp_v6_prot, | |
1143 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1144 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1145 | }; |
1146 | ||
2c8c1e72 | 1147 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1148 | { |
d14a0ebd GR |
1149 | if (dccp_hashinfo.bhash == NULL) |
1150 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1151 | |
d14a0ebd GR |
1152 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1153 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1154 | } |
1155 | ||
2c8c1e72 | 1156 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1157 | { |
334527d3 | 1158 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1159 | } |
1160 | ||
1161 | static struct pernet_operations dccp_v6_ops = { | |
1162 | .init = dccp_v6_init_net, | |
1163 | .exit = dccp_v6_exit_net, | |
1164 | }; | |
1165 | ||
3df80d93 ACM |
1166 | static int __init dccp_v6_init(void) |
1167 | { | |
1168 | int err = proto_register(&dccp_v6_prot, 1); | |
1169 | ||
1170 | if (err != 0) | |
1171 | goto out; | |
1172 | ||
1173 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1174 | if (err != 0) | |
1175 | goto out_unregister_proto; | |
1176 | ||
1177 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1178 | |
8231bd27 PE |
1179 | err = register_pernet_subsys(&dccp_v6_ops); |
1180 | if (err != 0) | |
1181 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1182 | out: |
1183 | return err; | |
8231bd27 PE |
1184 | |
1185 | out_destroy_ctl_sock: | |
72478873 ACM |
1186 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1187 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1188 | out_unregister_proto: |
1189 | proto_unregister(&dccp_v6_prot); | |
1190 | goto out; | |
1191 | } | |
1192 | ||
1193 | static void __exit dccp_v6_exit(void) | |
1194 | { | |
8231bd27 | 1195 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1196 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1197 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1198 | proto_unregister(&dccp_v6_prot); | |
1199 | } | |
1200 | ||
1201 | module_init(dccp_v6_init); | |
1202 | module_exit(dccp_v6_exit); | |
1203 | ||
1204 | /* | |
1205 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1206 | * values directly, Also cover the case where the protocol is not specified, | |
1207 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1208 | */ | |
7131c6c7 JD |
1209 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1210 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1211 | MODULE_LICENSE("GPL"); |
1212 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1213 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |