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); | |
efe4208f | 70 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_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 | ||
ec18d9a2 DM |
133 | if (type == NDISC_REDIRECT) { |
134 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
135 | ||
1ed5c48f | 136 | if (dst) |
6700c270 | 137 | dst->ops->redirect(dst, sk, skb); |
bd784a14 | 138 | goto out; |
ec18d9a2 DM |
139 | } |
140 | ||
3df80d93 | 141 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
142 | struct dst_entry *dst = NULL; |
143 | ||
93b36cf3 HFS |
144 | if (!ip6_sk_accept_pmtu(sk)) |
145 | goto out; | |
146 | ||
3df80d93 ACM |
147 | if (sock_owned_by_user(sk)) |
148 | goto out; | |
149 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
150 | goto out; | |
151 | ||
35ad9b9c DM |
152 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
153 | if (!dst) | |
154 | goto out; | |
155 | ||
156 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 157 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
158 | goto out; |
159 | } | |
160 | ||
161 | icmpv6_err_convert(type, code, &err); | |
162 | ||
3df80d93 ACM |
163 | /* Might be for an request_sock */ |
164 | switch (sk->sk_state) { | |
165 | struct request_sock *req, **prev; | |
166 | case DCCP_LISTEN: | |
167 | if (sock_owned_by_user(sk)) | |
168 | goto out; | |
169 | ||
170 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
171 | &hdr->daddr, &hdr->saddr, | |
172 | inet6_iif(skb)); | |
45329e71 | 173 | if (req == NULL) |
3df80d93 ACM |
174 | goto out; |
175 | ||
45329e71 ACM |
176 | /* |
177 | * ICMPs are not backlogged, hence we cannot get an established | |
178 | * socket here. | |
3df80d93 | 179 | */ |
547b792c | 180 | WARN_ON(req->sk != NULL); |
3df80d93 | 181 | |
f541fb7e SJ |
182 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
183 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 184 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
185 | goto out; |
186 | } | |
187 | ||
188 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
189 | goto out; | |
190 | ||
191 | case DCCP_REQUESTING: | |
192 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 193 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
194 | if (!sock_owned_by_user(sk)) { |
195 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
196 | sk->sk_err = err; | |
197 | /* | |
198 | * Wake people up to see the error | |
199 | * (see connect in sock.c) | |
200 | */ | |
201 | sk->sk_error_report(sk); | |
3df80d93 ACM |
202 | dccp_done(sk); |
203 | } else | |
204 | sk->sk_err_soft = err; | |
205 | goto out; | |
206 | } | |
207 | ||
208 | if (!sock_owned_by_user(sk) && np->recverr) { | |
209 | sk->sk_err = err; | |
210 | sk->sk_error_report(sk); | |
211 | } else | |
212 | sk->sk_err_soft = err; | |
213 | ||
214 | out: | |
215 | bh_unlock_sock(sk); | |
216 | sock_put(sk); | |
217 | } | |
218 | ||
219 | ||
1a2c6181 | 220 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 | 221 | { |
634fb979 | 222 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
223 | struct ipv6_pinfo *np = inet6_sk(sk); |
224 | struct sk_buff *skb; | |
20c59de2 | 225 | struct in6_addr *final_p, final; |
4c9483b2 | 226 | struct flowi6 fl6; |
3df80d93 | 227 | int err = -1; |
fd80eb94 | 228 | struct dst_entry *dst; |
3df80d93 | 229 | |
4c9483b2 DM |
230 | memset(&fl6, 0, sizeof(fl6)); |
231 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
232 | fl6.daddr = ireq->ir_v6_rmt_addr; |
233 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 234 | fl6.flowlabel = 0; |
634fb979 ED |
235 | fl6.flowi6_oif = ireq->ir_iif; |
236 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 237 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 238 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 239 | |
3df80d93 | 240 | |
0979e465 | 241 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
3df80d93 | 242 | |
0e0d44ab | 243 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
244 | if (IS_ERR(dst)) { |
245 | err = PTR_ERR(dst); | |
246 | dst = NULL; | |
fd80eb94 | 247 | goto done; |
68d0c6d3 | 248 | } |
3df80d93 ACM |
249 | |
250 | skb = dccp_make_response(sk, dst, req); | |
251 | if (skb != NULL) { | |
252 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 253 | |
6f4e5fff | 254 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
255 | &ireq->ir_v6_loc_addr, |
256 | &ireq->ir_v6_rmt_addr); | |
257 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
0979e465 | 258 | err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
b9df3cb8 | 259 | err = net_xmit_eval(err); |
3df80d93 ACM |
260 | } |
261 | ||
262 | done: | |
0cbd7825 | 263 | dst_release(dst); |
3df80d93 ACM |
264 | return err; |
265 | } | |
266 | ||
267 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
268 | { | |
d99a7bd2 | 269 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
634fb979 | 270 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
271 | } |
272 | ||
cfb6eeb4 | 273 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 274 | { |
b71d1d42 | 275 | const struct ipv6hdr *rxip6h; |
3df80d93 | 276 | struct sk_buff *skb; |
4c9483b2 | 277 | struct flowi6 fl6; |
adf30907 | 278 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 279 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 280 | struct dst_entry *dst; |
3df80d93 | 281 | |
e356d37a | 282 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
283 | return; |
284 | ||
285 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 286 | return; |
3df80d93 | 287 | |
02047741 | 288 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 289 | if (skb == NULL) |
8109b02b | 290 | return; |
3df80d93 | 291 | |
0660e03f | 292 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
293 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
294 | &rxip6h->daddr); | |
6f4e5fff | 295 | |
4c9483b2 | 296 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
297 | fl6.daddr = rxip6h->saddr; |
298 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 299 | |
4c9483b2 DM |
300 | fl6.flowi6_proto = IPPROTO_DCCP; |
301 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
302 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
303 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 304 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
305 | |
306 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 307 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
308 | if (!IS_ERR(dst)) { |
309 | skb_dst_set(skb, dst); | |
b903d324 | 310 | ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); |
68d0c6d3 DM |
311 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
312 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
313 | return; | |
3df80d93 ACM |
314 | } |
315 | ||
316 | kfree_skb(skb); | |
317 | } | |
318 | ||
73c9e02c GR |
319 | static struct request_sock_ops dccp6_request_sock_ops = { |
320 | .family = AF_INET6, | |
321 | .obj_size = sizeof(struct dccp6_request_sock), | |
322 | .rtx_syn_ack = dccp_v6_send_response, | |
323 | .send_ack = dccp_reqsk_send_ack, | |
324 | .destructor = dccp_v6_reqsk_destructor, | |
325 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 326 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
327 | }; |
328 | ||
3df80d93 ACM |
329 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
330 | { | |
331 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 332 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
333 | struct sock *nsk; |
334 | struct request_sock **prev; | |
335 | /* Find possible connection requests. */ | |
336 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
337 | dh->dccph_sport, | |
338 | &iph->saddr, | |
339 | &iph->daddr, | |
340 | inet6_iif(skb)); | |
341 | if (req != NULL) | |
342 | return dccp_check_req(sk, skb, req, prev); | |
343 | ||
671a1c74 | 344 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
345 | &iph->saddr, dh->dccph_sport, |
346 | &iph->daddr, ntohs(dh->dccph_dport), | |
347 | inet6_iif(skb)); | |
3df80d93 ACM |
348 | if (nsk != NULL) { |
349 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
350 | bh_lock_sock(nsk); | |
351 | return nsk; | |
352 | } | |
9469c7b4 | 353 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
354 | return NULL; |
355 | } | |
356 | ||
357 | return sk; | |
358 | } | |
359 | ||
360 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
361 | { | |
3df80d93 ACM |
362 | struct request_sock *req; |
363 | struct dccp_request_sock *dreq; | |
634fb979 | 364 | struct inet_request_sock *ireq; |
3df80d93 | 365 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 366 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 367 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
368 | |
369 | if (skb->protocol == htons(ETH_P_IP)) | |
370 | return dccp_v4_conn_request(sk, skb); | |
371 | ||
372 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 373 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
374 | |
375 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 376 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 377 | goto drop; |
8109b02b | 378 | } |
3df80d93 | 379 | /* |
45329e71 | 380 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 381 | */ |
4a5409a5 | 382 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 383 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 384 | goto drop; |
3df80d93 ACM |
385 | |
386 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
387 | goto drop; | |
388 | ||
476eab82 | 389 | req = inet_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
390 | if (req == NULL) |
391 | goto drop; | |
392 | ||
ac75773c GR |
393 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
394 | goto drop_and_free; | |
3df80d93 | 395 | |
8b819412 GR |
396 | dreq = dccp_rsk(req); |
397 | if (dccp_parse_options(sk, dreq, skb)) | |
398 | goto drop_and_free; | |
399 | ||
4237c75c VY |
400 | if (security_inet_conn_request(sk, skb, req)) |
401 | goto drop_and_free; | |
402 | ||
634fb979 ED |
403 | ireq = inet_rsk(req); |
404 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
405 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
bd337c58 | 406 | write_pnet(&ireq->ireq_net, sock_net(sk)); |
3f66b083 | 407 | ireq->ireq_family = AF_INET6; |
3df80d93 | 408 | |
a224772d | 409 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
410 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
411 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
412 | atomic_inc(&skb->users); | |
634fb979 | 413 | ireq->pktopts = skb; |
3df80d93 | 414 | } |
634fb979 | 415 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
416 | |
417 | /* So that link locals have meaning */ | |
418 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
419 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
420 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 421 | |
45329e71 | 422 | /* |
3df80d93 ACM |
423 | * Step 3: Process LISTEN state |
424 | * | |
d83ca5ac | 425 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 426 | * |
f541fb7e | 427 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 428 | */ |
3df80d93 | 429 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 430 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 431 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 432 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
433 | dreq->dreq_service = service; |
434 | ||
1a2c6181 | 435 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
436 | goto drop_and_free; |
437 | ||
438 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
439 | return 0; | |
440 | ||
441 | drop_and_free: | |
442 | reqsk_free(req); | |
443 | drop: | |
444 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
445 | return -1; |
446 | } | |
447 | ||
448 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
449 | struct sk_buff *skb, | |
450 | struct request_sock *req, | |
451 | struct dst_entry *dst) | |
452 | { | |
634fb979 | 453 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
454 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
455 | struct inet_sock *newinet; | |
3df80d93 ACM |
456 | struct dccp6_sock *newdp6; |
457 | struct sock *newsk; | |
3df80d93 ACM |
458 | |
459 | if (skb->protocol == htons(ETH_P_IP)) { | |
460 | /* | |
461 | * v6 mapped | |
462 | */ | |
3df80d93 | 463 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 464 | if (newsk == NULL) |
3df80d93 ACM |
465 | return NULL; |
466 | ||
467 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
468 | newinet = inet_sk(newsk); |
469 | newinet->pinet6 = &newdp6->inet6; | |
470 | newnp = inet6_sk(newsk); | |
471 | ||
472 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
473 | ||
efe4208f | 474 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
3df80d93 | 475 | |
c720c7e8 | 476 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
3df80d93 | 477 | |
efe4208f | 478 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
3df80d93 ACM |
479 | |
480 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
481 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
482 | newnp->pktoptions = NULL; | |
483 | newnp->opt = NULL; | |
484 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 485 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
486 | |
487 | /* | |
488 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
489 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
490 | * that function for the gory details. -acme | |
491 | */ | |
492 | ||
493 | /* It is tricky place. Until this moment IPv4 tcp | |
494 | worked with IPv6 icsk.icsk_af_ops. | |
495 | Sync it now. | |
496 | */ | |
d83d8461 | 497 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
498 | |
499 | return newsk; | |
500 | } | |
501 | ||
3df80d93 ACM |
502 | |
503 | if (sk_acceptq_is_full(sk)) | |
504 | goto out_overflow; | |
505 | ||
3df80d93 | 506 | if (dst == NULL) { |
20c59de2 | 507 | struct in6_addr *final_p, final; |
4c9483b2 DM |
508 | struct flowi6 fl6; |
509 | ||
510 | memset(&fl6, 0, sizeof(fl6)); | |
511 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 | 512 | fl6.daddr = ireq->ir_v6_rmt_addr; |
0979e465 | 513 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
634fb979 | 514 | fl6.saddr = ireq->ir_v6_loc_addr; |
4c9483b2 | 515 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
634fb979 | 516 | fl6.fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 517 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 DM |
518 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
519 | ||
0e0d44ab | 520 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 | 521 | if (IS_ERR(dst)) |
3df80d93 | 522 | goto out; |
45329e71 | 523 | } |
3df80d93 ACM |
524 | |
525 | newsk = dccp_create_openreq_child(sk, req, skb); | |
526 | if (newsk == NULL) | |
093d2823 | 527 | goto out_nonewsk; |
3df80d93 ACM |
528 | |
529 | /* | |
530 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
531 | * count here, dccp_create_openreq_child now does this for us, see the | |
532 | * comment in that function for the gory details. -acme | |
533 | */ | |
534 | ||
8e1ef0a9 | 535 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
536 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
537 | NETIF_F_TSO); | |
3df80d93 ACM |
538 | newdp6 = (struct dccp6_sock *)newsk; |
539 | newinet = inet_sk(newsk); | |
540 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
541 | newnp = inet6_sk(newsk); |
542 | ||
543 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
544 | ||
634fb979 ED |
545 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
546 | newnp->saddr = ireq->ir_v6_loc_addr; | |
547 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
548 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 549 | |
45329e71 | 550 | /* Now IPv6 options... |
3df80d93 ACM |
551 | |
552 | First: no IPv4 options. | |
553 | */ | |
f6d8bd05 | 554 | newinet->inet_opt = NULL; |
3df80d93 ACM |
555 | |
556 | /* Clone RX bits */ | |
557 | newnp->rxopt.all = np->rxopt.all; | |
558 | ||
559 | /* Clone pktoptions received with SYN */ | |
560 | newnp->pktoptions = NULL; | |
634fb979 ED |
561 | if (ireq->pktopts != NULL) { |
562 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
563 | consume_skb(ireq->pktopts); | |
564 | ireq->pktopts = NULL; | |
3df80d93 ACM |
565 | if (newnp->pktoptions) |
566 | skb_set_owner_r(newnp->pktoptions, newsk); | |
567 | } | |
568 | newnp->opt = NULL; | |
569 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 570 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 571 | |
45329e71 ACM |
572 | /* |
573 | * Clone native IPv6 options from listening socket (if any) | |
574 | * | |
575 | * Yes, keeping reference count would be much more clever, but we make | |
576 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 577 | */ |
0979e465 RL |
578 | if (np->opt != NULL) |
579 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 580 | |
d83d8461 | 581 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 582 | if (newnp->opt != NULL) |
d83d8461 ACM |
583 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
584 | newnp->opt->opt_flen); | |
3df80d93 ACM |
585 | |
586 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
587 | ||
c720c7e8 ED |
588 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
589 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 590 | |
093d2823 | 591 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
592 | inet_csk_prepare_forced_close(newsk); |
593 | dccp_done(newsk); | |
093d2823 BS |
594 | goto out; |
595 | } | |
9327f705 | 596 | __inet6_hash(newsk, NULL); |
3df80d93 ACM |
597 | |
598 | return newsk; | |
599 | ||
600 | out_overflow: | |
de0744af | 601 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
602 | out_nonewsk: |
603 | dst_release(dst); | |
3df80d93 | 604 | out: |
de0744af | 605 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
606 | return NULL; |
607 | } | |
608 | ||
609 | /* The socket must have it's spinlock held when we get | |
610 | * here. | |
611 | * | |
612 | * We have a potential double-lock case here, so even when | |
613 | * doing backlog processing we use the BH locking scheme. | |
614 | * This is because we cannot sleep with the original spinlock | |
615 | * held. | |
616 | */ | |
617 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
618 | { | |
619 | struct ipv6_pinfo *np = inet6_sk(sk); | |
620 | struct sk_buff *opt_skb = NULL; | |
621 | ||
622 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
623 | goes to IPv4 receive handler and backlogged. | |
624 | From backlog it always goes here. Kerboom... | |
625 | Fortunately, dccp_rcv_established and rcv_established | |
626 | handle them correctly, but it is not case with | |
627 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
628 | */ | |
629 | ||
630 | if (skb->protocol == htons(ETH_P_IP)) | |
631 | return dccp_v4_do_rcv(sk, skb); | |
632 | ||
fda9ef5d | 633 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
634 | goto discard; |
635 | ||
636 | /* | |
45329e71 ACM |
637 | * socket locking is here for SMP purposes as backlog rcv is currently |
638 | * called with bh processing disabled. | |
3df80d93 ACM |
639 | */ |
640 | ||
641 | /* Do Stevens' IPV6_PKTOPTIONS. | |
642 | ||
643 | Yes, guys, it is the only place in our code, where we | |
644 | may make it not affecting IPv4. | |
645 | The rest of code is protocol independent, | |
646 | and I do not like idea to uglify IPv4. | |
647 | ||
648 | Actually, all the idea behind IPV6_PKTOPTIONS | |
649 | looks not very well thought. For now we latch | |
650 | options, received in the last packet, enqueued | |
651 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 652 | --ANK (980728) |
3df80d93 ACM |
653 | */ |
654 | if (np->rxopt.all) | |
89e7e577 GR |
655 | /* |
656 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
657 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
658 | */ | |
3df80d93 ACM |
659 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
660 | ||
661 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
662 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
663 | goto reset; | |
fd169f15 | 664 | if (opt_skb) { |
89e7e577 | 665 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
666 | __kfree_skb(opt_skb); |
667 | } | |
3df80d93 ACM |
668 | return 0; |
669 | } | |
670 | ||
d83ca5ac GR |
671 | /* |
672 | * Step 3: Process LISTEN state | |
673 | * If S.state == LISTEN, | |
674 | * If P.type == Request or P contains a valid Init Cookie option, | |
675 | * (* Must scan the packet's options to check for Init | |
676 | * Cookies. Only Init Cookies are processed here, | |
677 | * however; other options are processed in Step 8. This | |
678 | * scan need only be performed if the endpoint uses Init | |
679 | * Cookies *) | |
680 | * (* Generate a new socket and switch to that socket *) | |
681 | * Set S := new socket for this port pair | |
682 | * S.state = RESPOND | |
683 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
684 | * Initialize S.GAR := S.ISS | |
685 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
686 | * Continue with S.state == RESPOND | |
687 | * (* A Response packet will be generated in Step 11 *) | |
688 | * Otherwise, | |
689 | * Generate Reset(No Connection) unless P.type == Reset | |
690 | * Drop packet and return | |
691 | * | |
692 | * NOTE: the check for the packet types is done in | |
693 | * dccp_rcv_state_process | |
694 | */ | |
45329e71 | 695 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 696 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 697 | |
45329e71 ACM |
698 | if (nsk == NULL) |
699 | goto discard; | |
3df80d93 ACM |
700 | /* |
701 | * Queue it on the new socket if the new socket is active, | |
702 | * otherwise we just shortcircuit this and continue with | |
703 | * the new socket.. | |
704 | */ | |
8109b02b | 705 | if (nsk != sk) { |
3df80d93 ACM |
706 | if (dccp_child_process(sk, nsk, skb)) |
707 | goto reset; | |
45329e71 | 708 | if (opt_skb != NULL) |
3df80d93 ACM |
709 | __kfree_skb(opt_skb); |
710 | return 0; | |
711 | } | |
712 | } | |
713 | ||
714 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
715 | goto reset; | |
fd169f15 | 716 | if (opt_skb) { |
89e7e577 | 717 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
718 | __kfree_skb(opt_skb); |
719 | } | |
3df80d93 ACM |
720 | return 0; |
721 | ||
722 | reset: | |
cfb6eeb4 | 723 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 724 | discard: |
45329e71 | 725 | if (opt_skb != NULL) |
3df80d93 ACM |
726 | __kfree_skb(opt_skb); |
727 | kfree_skb(skb); | |
728 | return 0; | |
729 | } | |
730 | ||
e5bbef20 | 731 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
732 | { |
733 | const struct dccp_hdr *dh; | |
3df80d93 | 734 | struct sock *sk; |
6f4e5fff | 735 | int min_cov; |
3df80d93 | 736 | |
6f4e5fff | 737 | /* Step 1: Check header basics */ |
3df80d93 ACM |
738 | |
739 | if (dccp_invalid_packet(skb)) | |
740 | goto discard_it; | |
741 | ||
6f4e5fff | 742 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
743 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
744 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 745 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
746 | goto discard_it; |
747 | } | |
748 | ||
3df80d93 ACM |
749 | dh = dccp_hdr(skb); |
750 | ||
fde20105 | 751 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
752 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
753 | ||
754 | if (dccp_packet_without_ack(skb)) | |
755 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
756 | else | |
757 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
758 | ||
759 | /* Step 2: | |
8109b02b | 760 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 | 761 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
870c3151 ED |
762 | dh->dccph_sport, dh->dccph_dport, |
763 | inet6_iif(skb)); | |
45329e71 | 764 | /* |
3df80d93 | 765 | * Step 2: |
8109b02b | 766 | * If no socket ... |
3df80d93 | 767 | */ |
d23c7107 GR |
768 | if (sk == NULL) { |
769 | dccp_pr_debug("failed to look up flow ID in table and " | |
770 | "get corresponding socket\n"); | |
3df80d93 | 771 | goto no_dccp_socket; |
d23c7107 | 772 | } |
3df80d93 | 773 | |
45329e71 | 774 | /* |
3df80d93 | 775 | * Step 2: |
8109b02b | 776 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
777 | * Generate Reset(No Connection) unless P.type == Reset |
778 | * Drop packet and return | |
779 | */ | |
d23c7107 GR |
780 | if (sk->sk_state == DCCP_TIME_WAIT) { |
781 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
782 | inet_twsk_put(inet_twsk(sk)); | |
783 | goto no_dccp_socket; | |
784 | } | |
3df80d93 | 785 | |
6f4e5fff GR |
786 | /* |
787 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
788 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
789 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
790 | */ |
791 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
792 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
793 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
794 | dh->dccph_cscov, min_cov); | |
795 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
796 | goto discard_and_relse; | |
797 | } | |
798 | ||
3df80d93 ACM |
799 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
800 | goto discard_and_relse; | |
801 | ||
58a5a7b9 | 802 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
803 | |
804 | no_dccp_socket: | |
805 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
806 | goto discard_it; | |
807 | /* | |
808 | * Step 2: | |
8109b02b | 809 | * If no socket ... |
3df80d93 ACM |
810 | * Generate Reset(No Connection) unless P.type == Reset |
811 | * Drop packet and return | |
812 | */ | |
813 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
814 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
815 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 816 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 817 | } |
3df80d93 | 818 | |
d23c7107 | 819 | discard_it: |
3df80d93 ACM |
820 | kfree_skb(skb); |
821 | return 0; | |
822 | ||
823 | discard_and_relse: | |
824 | sock_put(sk); | |
825 | goto discard_it; | |
3df80d93 ACM |
826 | } |
827 | ||
73c9e02c GR |
828 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
829 | int addr_len) | |
830 | { | |
831 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
832 | struct inet_connection_sock *icsk = inet_csk(sk); | |
833 | struct inet_sock *inet = inet_sk(sk); | |
834 | struct ipv6_pinfo *np = inet6_sk(sk); | |
835 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 836 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 837 | struct flowi6 fl6; |
73c9e02c GR |
838 | struct dst_entry *dst; |
839 | int addr_type; | |
840 | int err; | |
841 | ||
842 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
843 | ||
844 | if (addr_len < SIN6_LEN_RFC2133) | |
845 | return -EINVAL; | |
846 | ||
847 | if (usin->sin6_family != AF_INET6) | |
848 | return -EAFNOSUPPORT; | |
849 | ||
4c9483b2 | 850 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
851 | |
852 | if (np->sndflow) { | |
4c9483b2 DM |
853 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
854 | IP6_ECN_flow_init(fl6.flowlabel); | |
855 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 856 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 857 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
858 | if (flowlabel == NULL) |
859 | return -EINVAL; | |
73c9e02c GR |
860 | fl6_sock_release(flowlabel); |
861 | } | |
862 | } | |
863 | /* | |
864 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
865 | */ | |
866 | if (ipv6_addr_any(&usin->sin6_addr)) | |
867 | usin->sin6_addr.s6_addr[15] = 1; | |
868 | ||
869 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
870 | ||
871 | if (addr_type & IPV6_ADDR_MULTICAST) | |
872 | return -ENETUNREACH; | |
873 | ||
874 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
875 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
876 | usin->sin6_scope_id) { | |
877 | /* If interface is set while binding, indices | |
878 | * must coincide. | |
879 | */ | |
880 | if (sk->sk_bound_dev_if && | |
881 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
882 | return -EINVAL; | |
883 | ||
884 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
885 | } | |
886 | ||
887 | /* Connect to link-local address requires an interface */ | |
888 | if (!sk->sk_bound_dev_if) | |
889 | return -EINVAL; | |
890 | } | |
891 | ||
efe4208f | 892 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 893 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
894 | |
895 | /* | |
896 | * DCCP over IPv4 | |
897 | */ | |
898 | if (addr_type == IPV6_ADDR_MAPPED) { | |
899 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
900 | struct sockaddr_in sin; | |
901 | ||
902 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
903 | ||
904 | if (__ipv6_only_sock(sk)) | |
905 | return -ENETUNREACH; | |
906 | ||
907 | sin.sin_family = AF_INET; | |
908 | sin.sin_port = usin->sin6_port; | |
909 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
910 | ||
911 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
912 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
913 | ||
914 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
915 | if (err) { | |
916 | icsk->icsk_ext_hdr_len = exthdrlen; | |
917 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
918 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
919 | goto failure; | |
73c9e02c | 920 | } |
c720c7e8 | 921 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
efe4208f | 922 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr); |
73c9e02c GR |
923 | |
924 | return err; | |
925 | } | |
926 | ||
efe4208f ED |
927 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
928 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 929 | |
4c9483b2 | 930 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 931 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 932 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 933 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
934 | fl6.fl6_dport = usin->sin6_port; |
935 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 936 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 937 | |
4c9483b2 | 938 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 939 | |
0e0d44ab | 940 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
941 | if (IS_ERR(dst)) { |
942 | err = PTR_ERR(dst); | |
73c9e02c | 943 | goto failure; |
14e50e57 | 944 | } |
73c9e02c GR |
945 | |
946 | if (saddr == NULL) { | |
4c9483b2 | 947 | saddr = &fl6.saddr; |
efe4208f | 948 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
949 | } |
950 | ||
951 | /* set the source address */ | |
4e3fd7a0 | 952 | np->saddr = *saddr; |
c720c7e8 | 953 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
954 | |
955 | __ip6_dst_store(sk, dst, NULL, NULL); | |
956 | ||
957 | icsk->icsk_ext_hdr_len = 0; | |
958 | if (np->opt != NULL) | |
959 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
960 | np->opt->opt_nflen); | |
961 | ||
c720c7e8 | 962 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
963 | |
964 | dccp_set_state(sk, DCCP_REQUESTING); | |
965 | err = inet6_hash_connect(&dccp_death_row, sk); | |
966 | if (err) | |
967 | goto late_failure; | |
d7f7365f GR |
968 | |
969 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 970 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
971 | inet->inet_sport, |
972 | inet->inet_dport); | |
73c9e02c GR |
973 | err = dccp_connect(sk); |
974 | if (err) | |
975 | goto late_failure; | |
976 | ||
977 | return 0; | |
978 | ||
979 | late_failure: | |
980 | dccp_set_state(sk, DCCP_CLOSED); | |
981 | __sk_dst_reset(sk); | |
982 | failure: | |
c720c7e8 | 983 | inet->inet_dport = 0; |
73c9e02c GR |
984 | sk->sk_route_caps = 0; |
985 | return err; | |
986 | } | |
987 | ||
3b401a81 | 988 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
989 | .queue_xmit = inet6_csk_xmit, |
990 | .send_check = dccp_v6_send_check, | |
991 | .rebuild_header = inet6_sk_rebuild_header, | |
992 | .conn_request = dccp_v6_conn_request, | |
993 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
994 | .net_header_len = sizeof(struct ipv6hdr), | |
995 | .setsockopt = ipv6_setsockopt, | |
996 | .getsockopt = ipv6_getsockopt, | |
997 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
998 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 999 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1000 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1001 | .compat_setsockopt = compat_ipv6_setsockopt, |
1002 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1003 | #endif |
3df80d93 ACM |
1004 | }; |
1005 | ||
1006 | /* | |
1007 | * DCCP over IPv4 via INET6 API | |
1008 | */ | |
3b401a81 | 1009 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
1010 | .queue_xmit = ip_queue_xmit, |
1011 | .send_check = dccp_v4_send_check, | |
1012 | .rebuild_header = inet_sk_rebuild_header, | |
1013 | .conn_request = dccp_v6_conn_request, | |
1014 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1015 | .net_header_len = sizeof(struct iphdr), | |
1016 | .setsockopt = ipv6_setsockopt, | |
1017 | .getsockopt = ipv6_getsockopt, | |
1018 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1019 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1020 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1021 | .compat_setsockopt = compat_ipv6_setsockopt, |
1022 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1023 | #endif |
3df80d93 ACM |
1024 | }; |
1025 | ||
1026 | /* NOTE: A lot of things set to zero explicitly by call to | |
1027 | * sk_alloc() so need not be done here. | |
1028 | */ | |
1029 | static int dccp_v6_init_sock(struct sock *sk) | |
1030 | { | |
72478873 ACM |
1031 | static __u8 dccp_v6_ctl_sock_initialized; |
1032 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1033 | |
72478873 ACM |
1034 | if (err == 0) { |
1035 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1036 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1037 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1038 | } |
3df80d93 ACM |
1039 | |
1040 | return err; | |
1041 | } | |
1042 | ||
7d06b2e0 | 1043 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1044 | { |
3e0fadc5 | 1045 | dccp_destroy_sock(sk); |
7d06b2e0 | 1046 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1047 | } |
1048 | ||
73c9e02c GR |
1049 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1050 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1051 | }; | |
1052 | ||
3df80d93 | 1053 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1054 | .name = "DCCPv6", |
1055 | .owner = THIS_MODULE, | |
1056 | .close = dccp_close, | |
1057 | .connect = dccp_v6_connect, | |
1058 | .disconnect = dccp_disconnect, | |
1059 | .ioctl = dccp_ioctl, | |
1060 | .init = dccp_v6_init_sock, | |
1061 | .setsockopt = dccp_setsockopt, | |
1062 | .getsockopt = dccp_getsockopt, | |
1063 | .sendmsg = dccp_sendmsg, | |
1064 | .recvmsg = dccp_recvmsg, | |
1065 | .backlog_rcv = dccp_v6_do_rcv, | |
1066 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1067 | .unhash = inet_unhash, |
543d9cfe | 1068 | .accept = inet_csk_accept, |
ab1e0a13 | 1069 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1070 | .shutdown = dccp_shutdown, |
1071 | .destroy = dccp_v6_destroy_sock, | |
1072 | .orphan_count = &dccp_orphan_count, | |
1073 | .max_header = MAX_DCCP_HEADER, | |
1074 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1075 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1076 | .rsk_prot = &dccp6_request_sock_ops, |
1077 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1078 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1079 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1080 | .compat_setsockopt = compat_dccp_setsockopt, |
1081 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1082 | #endif |
3df80d93 ACM |
1083 | }; |
1084 | ||
41135cc8 | 1085 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1086 | .handler = dccp_v6_rcv, |
1087 | .err_handler = dccp_v6_err, | |
1088 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1089 | }; |
1090 | ||
5708e868 | 1091 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1092 | .family = PF_INET6, |
1093 | .owner = THIS_MODULE, | |
1094 | .release = inet6_release, | |
1095 | .bind = inet6_bind, | |
1096 | .connect = inet_stream_connect, | |
1097 | .socketpair = sock_no_socketpair, | |
1098 | .accept = inet_accept, | |
1099 | .getname = inet6_getname, | |
1100 | .poll = dccp_poll, | |
1101 | .ioctl = inet6_ioctl, | |
1102 | .listen = inet_dccp_listen, | |
1103 | .shutdown = inet_shutdown, | |
1104 | .setsockopt = sock_common_setsockopt, | |
1105 | .getsockopt = sock_common_getsockopt, | |
1106 | .sendmsg = inet_sendmsg, | |
1107 | .recvmsg = sock_common_recvmsg, | |
1108 | .mmap = sock_no_mmap, | |
1109 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1110 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1111 | .compat_setsockopt = compat_sock_common_setsockopt, |
1112 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1113 | #endif |
3df80d93 ACM |
1114 | }; |
1115 | ||
1116 | static struct inet_protosw dccp_v6_protosw = { | |
1117 | .type = SOCK_DCCP, | |
1118 | .protocol = IPPROTO_DCCP, | |
1119 | .prot = &dccp_v6_prot, | |
1120 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1121 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1122 | }; |
1123 | ||
2c8c1e72 | 1124 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1125 | { |
d14a0ebd GR |
1126 | if (dccp_hashinfo.bhash == NULL) |
1127 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1128 | |
d14a0ebd GR |
1129 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1130 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1131 | } |
1132 | ||
2c8c1e72 | 1133 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1134 | { |
334527d3 | 1135 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1136 | } |
1137 | ||
1138 | static struct pernet_operations dccp_v6_ops = { | |
1139 | .init = dccp_v6_init_net, | |
1140 | .exit = dccp_v6_exit_net, | |
1141 | }; | |
1142 | ||
3df80d93 ACM |
1143 | static int __init dccp_v6_init(void) |
1144 | { | |
1145 | int err = proto_register(&dccp_v6_prot, 1); | |
1146 | ||
1147 | if (err != 0) | |
1148 | goto out; | |
1149 | ||
1150 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1151 | if (err != 0) | |
1152 | goto out_unregister_proto; | |
1153 | ||
1154 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1155 | |
8231bd27 PE |
1156 | err = register_pernet_subsys(&dccp_v6_ops); |
1157 | if (err != 0) | |
1158 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1159 | out: |
1160 | return err; | |
8231bd27 PE |
1161 | |
1162 | out_destroy_ctl_sock: | |
72478873 ACM |
1163 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1164 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1165 | out_unregister_proto: |
1166 | proto_unregister(&dccp_v6_prot); | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | static void __exit dccp_v6_exit(void) | |
1171 | { | |
8231bd27 | 1172 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1173 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1174 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1175 | proto_unregister(&dccp_v6_prot); | |
1176 | } | |
1177 | ||
1178 | module_init(dccp_v6_init); | |
1179 | module_exit(dccp_v6_exit); | |
1180 | ||
1181 | /* | |
1182 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1183 | * values directly, Also cover the case where the protocol is not specified, | |
1184 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1185 | */ | |
7131c6c7 JD |
1186 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1187 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1188 | MODULE_LICENSE("GPL"); |
1189 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1190 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |