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Commit | Line | Data |
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3df80d93 ACM |
1 | /* |
2 | * DCCP over IPv6 | |
45329e71 | 3 | * Linux INET6 implementation |
3df80d93 ACM |
4 | * |
5 | * Based on net/dccp6/ipv6.c | |
6 | * | |
7 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
3df80d93 ACM |
15 | #include <linux/module.h> |
16 | #include <linux/random.h> | |
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 | |
6f4e5fff | 43 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 44 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
b71d1d42 ED |
45 | const struct in6_addr *saddr, |
46 | const struct in6_addr *daddr) | |
3df80d93 | 47 | { |
6f4e5fff GR |
48 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
49 | } | |
50 | ||
bb296246 | 51 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
6f4e5fff GR |
52 | { |
53 | struct ipv6_pinfo *np = inet6_sk(sk); | |
54 | struct dccp_hdr *dh = dccp_hdr(skb); | |
55 | ||
56 | dccp_csum_outgoing(skb); | |
efe4208f | 57 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); |
3df80d93 ACM |
58 | } |
59 | ||
6e5714ea | 60 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
d7f7365f | 61 | { |
0660e03f ACM |
62 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
63 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
64 | dccp_hdr(skb)->dccph_dport, |
65 | dccp_hdr(skb)->dccph_sport ); | |
66 | ||
3df80d93 ACM |
67 | } |
68 | ||
3df80d93 | 69 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 70 | u8 type, u8 code, int offset, __be32 info) |
3df80d93 | 71 | { |
b71d1d42 | 72 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
3df80d93 | 73 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); |
e0bcfb0c | 74 | struct dccp_sock *dp; |
3df80d93 ACM |
75 | struct ipv6_pinfo *np; |
76 | struct sock *sk; | |
77 | int err; | |
78 | __u64 seq; | |
ca12a1a4 | 79 | struct net *net = dev_net(skb->dev); |
3df80d93 | 80 | |
860239c5 WY |
81 | if (skb->len < offset + sizeof(*dh) || |
82 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
e41b5368 DL |
83 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
84 | ICMP6_MIB_INERRORS); | |
860239c5 WY |
85 | return; |
86 | } | |
87 | ||
ca12a1a4 | 88 | sk = inet6_lookup(net, &dccp_hashinfo, |
671a1c74 | 89 | &hdr->daddr, dh->dccph_dport, |
d86e0dac | 90 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
91 | |
92 | if (sk == NULL) { | |
e41b5368 DL |
93 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
94 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
95 | return; |
96 | } | |
97 | ||
98 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 99 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
100 | return; |
101 | } | |
102 | ||
103 | bh_lock_sock(sk); | |
104 | if (sock_owned_by_user(sk)) | |
de0744af | 105 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
106 | |
107 | if (sk->sk_state == DCCP_CLOSED) | |
108 | goto out; | |
109 | ||
e0bcfb0c WY |
110 | dp = dccp_sk(sk); |
111 | seq = dccp_hdr_seq(dh); | |
112 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && | |
113 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
114 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
115 | goto out; | |
116 | } | |
117 | ||
3df80d93 ACM |
118 | np = inet6_sk(sk); |
119 | ||
ec18d9a2 DM |
120 | if (type == NDISC_REDIRECT) { |
121 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
122 | ||
1ed5c48f | 123 | if (dst) |
6700c270 | 124 | dst->ops->redirect(dst, sk, skb); |
bd784a14 | 125 | goto out; |
ec18d9a2 DM |
126 | } |
127 | ||
3df80d93 | 128 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
129 | struct dst_entry *dst = NULL; |
130 | ||
93b36cf3 HFS |
131 | if (!ip6_sk_accept_pmtu(sk)) |
132 | goto out; | |
133 | ||
3df80d93 ACM |
134 | if (sock_owned_by_user(sk)) |
135 | goto out; | |
136 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
137 | goto out; | |
138 | ||
35ad9b9c DM |
139 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
140 | if (!dst) | |
141 | goto out; | |
142 | ||
143 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 144 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
145 | goto out; |
146 | } | |
147 | ||
148 | icmpv6_err_convert(type, code, &err); | |
149 | ||
3df80d93 ACM |
150 | /* Might be for an request_sock */ |
151 | switch (sk->sk_state) { | |
152 | struct request_sock *req, **prev; | |
153 | case DCCP_LISTEN: | |
154 | if (sock_owned_by_user(sk)) | |
155 | goto out; | |
156 | ||
157 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
158 | &hdr->daddr, &hdr->saddr, | |
159 | inet6_iif(skb)); | |
45329e71 | 160 | if (req == NULL) |
3df80d93 ACM |
161 | goto out; |
162 | ||
45329e71 ACM |
163 | /* |
164 | * ICMPs are not backlogged, hence we cannot get an established | |
165 | * socket here. | |
3df80d93 | 166 | */ |
547b792c | 167 | WARN_ON(req->sk != NULL); |
3df80d93 | 168 | |
f541fb7e SJ |
169 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
170 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 171 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
172 | goto out; |
173 | } | |
174 | ||
175 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
176 | goto out; | |
177 | ||
178 | case DCCP_REQUESTING: | |
179 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 180 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
181 | if (!sock_owned_by_user(sk)) { |
182 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
183 | sk->sk_err = err; | |
184 | /* | |
185 | * Wake people up to see the error | |
186 | * (see connect in sock.c) | |
187 | */ | |
188 | sk->sk_error_report(sk); | |
3df80d93 ACM |
189 | dccp_done(sk); |
190 | } else | |
191 | sk->sk_err_soft = err; | |
192 | goto out; | |
193 | } | |
194 | ||
195 | if (!sock_owned_by_user(sk) && np->recverr) { | |
196 | sk->sk_err = err; | |
197 | sk->sk_error_report(sk); | |
198 | } else | |
199 | sk->sk_err_soft = err; | |
200 | ||
201 | out: | |
202 | bh_unlock_sock(sk); | |
203 | sock_put(sk); | |
204 | } | |
205 | ||
206 | ||
1a2c6181 | 207 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 | 208 | { |
634fb979 | 209 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
210 | struct ipv6_pinfo *np = inet6_sk(sk); |
211 | struct sk_buff *skb; | |
20c59de2 | 212 | struct in6_addr *final_p, final; |
4c9483b2 | 213 | struct flowi6 fl6; |
3df80d93 | 214 | int err = -1; |
fd80eb94 | 215 | struct dst_entry *dst; |
3df80d93 | 216 | |
4c9483b2 DM |
217 | memset(&fl6, 0, sizeof(fl6)); |
218 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
219 | fl6.daddr = ireq->ir_v6_rmt_addr; |
220 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 221 | fl6.flowlabel = 0; |
634fb979 ED |
222 | fl6.flowi6_oif = ireq->ir_iif; |
223 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 224 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 225 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 226 | |
3df80d93 | 227 | |
0979e465 | 228 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
3df80d93 | 229 | |
0e0d44ab | 230 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
231 | if (IS_ERR(dst)) { |
232 | err = PTR_ERR(dst); | |
233 | dst = NULL; | |
fd80eb94 | 234 | goto done; |
68d0c6d3 | 235 | } |
3df80d93 ACM |
236 | |
237 | skb = dccp_make_response(sk, dst, req); | |
238 | if (skb != NULL) { | |
239 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 240 | |
6f4e5fff | 241 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
242 | &ireq->ir_v6_loc_addr, |
243 | &ireq->ir_v6_rmt_addr); | |
244 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
0979e465 | 245 | err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
b9df3cb8 | 246 | err = net_xmit_eval(err); |
3df80d93 ACM |
247 | } |
248 | ||
249 | done: | |
0cbd7825 | 250 | dst_release(dst); |
3df80d93 ACM |
251 | return err; |
252 | } | |
253 | ||
254 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
255 | { | |
d99a7bd2 | 256 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
634fb979 | 257 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
258 | } |
259 | ||
cfb6eeb4 | 260 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 261 | { |
b71d1d42 | 262 | const struct ipv6hdr *rxip6h; |
3df80d93 | 263 | struct sk_buff *skb; |
4c9483b2 | 264 | struct flowi6 fl6; |
adf30907 | 265 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 266 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 267 | struct dst_entry *dst; |
3df80d93 | 268 | |
e356d37a | 269 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
270 | return; |
271 | ||
272 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 273 | return; |
3df80d93 | 274 | |
02047741 | 275 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 276 | if (skb == NULL) |
8109b02b | 277 | return; |
3df80d93 | 278 | |
0660e03f | 279 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
280 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
281 | &rxip6h->daddr); | |
6f4e5fff | 282 | |
4c9483b2 | 283 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
284 | fl6.daddr = rxip6h->saddr; |
285 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 286 | |
4c9483b2 DM |
287 | fl6.flowi6_proto = IPPROTO_DCCP; |
288 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
289 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
290 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 291 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
292 | |
293 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 294 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
295 | if (!IS_ERR(dst)) { |
296 | skb_dst_set(skb, dst); | |
b903d324 | 297 | ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); |
68d0c6d3 DM |
298 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
299 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
300 | return; | |
3df80d93 ACM |
301 | } |
302 | ||
303 | kfree_skb(skb); | |
304 | } | |
305 | ||
73c9e02c GR |
306 | static struct request_sock_ops dccp6_request_sock_ops = { |
307 | .family = AF_INET6, | |
308 | .obj_size = sizeof(struct dccp6_request_sock), | |
309 | .rtx_syn_ack = dccp_v6_send_response, | |
310 | .send_ack = dccp_reqsk_send_ack, | |
311 | .destructor = dccp_v6_reqsk_destructor, | |
312 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 313 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
314 | }; |
315 | ||
3df80d93 ACM |
316 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
317 | { | |
318 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 319 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
320 | struct sock *nsk; |
321 | struct request_sock **prev; | |
322 | /* Find possible connection requests. */ | |
323 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
324 | dh->dccph_sport, | |
325 | &iph->saddr, | |
326 | &iph->daddr, | |
327 | inet6_iif(skb)); | |
328 | if (req != NULL) | |
329 | return dccp_check_req(sk, skb, req, prev); | |
330 | ||
671a1c74 | 331 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
332 | &iph->saddr, dh->dccph_sport, |
333 | &iph->daddr, ntohs(dh->dccph_dport), | |
334 | inet6_iif(skb)); | |
3df80d93 ACM |
335 | if (nsk != NULL) { |
336 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
337 | bh_lock_sock(nsk); | |
338 | return nsk; | |
339 | } | |
9469c7b4 | 340 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
341 | return NULL; |
342 | } | |
343 | ||
344 | return sk; | |
345 | } | |
346 | ||
347 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
348 | { | |
3df80d93 ACM |
349 | struct request_sock *req; |
350 | struct dccp_request_sock *dreq; | |
634fb979 | 351 | struct inet_request_sock *ireq; |
3df80d93 | 352 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 353 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 354 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
355 | |
356 | if (skb->protocol == htons(ETH_P_IP)) | |
357 | return dccp_v4_conn_request(sk, skb); | |
358 | ||
359 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 360 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
361 | |
362 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 363 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 364 | goto drop; |
8109b02b | 365 | } |
3df80d93 | 366 | /* |
45329e71 | 367 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 368 | */ |
4a5409a5 | 369 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 370 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 371 | goto drop; |
3df80d93 ACM |
372 | |
373 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
374 | goto drop; | |
375 | ||
407640de | 376 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk); |
3df80d93 ACM |
377 | if (req == NULL) |
378 | goto drop; | |
379 | ||
ac75773c GR |
380 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
381 | goto drop_and_free; | |
3df80d93 | 382 | |
8b819412 GR |
383 | dreq = dccp_rsk(req); |
384 | if (dccp_parse_options(sk, dreq, skb)) | |
385 | goto drop_and_free; | |
386 | ||
4237c75c VY |
387 | if (security_inet_conn_request(sk, skb, req)) |
388 | goto drop_and_free; | |
389 | ||
634fb979 ED |
390 | ireq = inet_rsk(req); |
391 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
392 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 393 | ireq->ireq_family = AF_INET6; |
3df80d93 | 394 | |
a224772d | 395 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
396 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
397 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
398 | atomic_inc(&skb->users); | |
634fb979 | 399 | ireq->pktopts = skb; |
3df80d93 | 400 | } |
634fb979 | 401 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
402 | |
403 | /* So that link locals have meaning */ | |
404 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
405 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
406 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 407 | |
45329e71 | 408 | /* |
3df80d93 ACM |
409 | * Step 3: Process LISTEN state |
410 | * | |
d83ca5ac | 411 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 412 | * |
f541fb7e | 413 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 414 | */ |
3df80d93 | 415 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 416 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 417 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 418 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
419 | dreq->dreq_service = service; |
420 | ||
1a2c6181 | 421 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
422 | goto drop_and_free; |
423 | ||
424 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
425 | return 0; | |
426 | ||
427 | drop_and_free: | |
428 | reqsk_free(req); | |
429 | drop: | |
430 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
431 | return -1; |
432 | } | |
433 | ||
434 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
435 | struct sk_buff *skb, | |
436 | struct request_sock *req, | |
437 | struct dst_entry *dst) | |
438 | { | |
634fb979 | 439 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
440 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
441 | struct inet_sock *newinet; | |
3df80d93 ACM |
442 | struct dccp6_sock *newdp6; |
443 | struct sock *newsk; | |
3df80d93 ACM |
444 | |
445 | if (skb->protocol == htons(ETH_P_IP)) { | |
446 | /* | |
447 | * v6 mapped | |
448 | */ | |
3df80d93 | 449 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 450 | if (newsk == NULL) |
3df80d93 ACM |
451 | return NULL; |
452 | ||
453 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
454 | newinet = inet_sk(newsk); |
455 | newinet->pinet6 = &newdp6->inet6; | |
456 | newnp = inet6_sk(newsk); | |
457 | ||
458 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
459 | ||
d1e559d0 | 460 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
461 | |
462 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
463 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
464 | newnp->pktoptions = NULL; | |
465 | newnp->opt = NULL; | |
466 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 467 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
468 | |
469 | /* | |
470 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
471 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
472 | * that function for the gory details. -acme | |
473 | */ | |
474 | ||
475 | /* It is tricky place. Until this moment IPv4 tcp | |
476 | worked with IPv6 icsk.icsk_af_ops. | |
477 | Sync it now. | |
478 | */ | |
d83d8461 | 479 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
480 | |
481 | return newsk; | |
482 | } | |
483 | ||
3df80d93 ACM |
484 | |
485 | if (sk_acceptq_is_full(sk)) | |
486 | goto out_overflow; | |
487 | ||
3df80d93 | 488 | if (dst == NULL) { |
20c59de2 | 489 | struct in6_addr *final_p, final; |
4c9483b2 DM |
490 | struct flowi6 fl6; |
491 | ||
492 | memset(&fl6, 0, sizeof(fl6)); | |
493 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 | 494 | fl6.daddr = ireq->ir_v6_rmt_addr; |
0979e465 | 495 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
634fb979 | 496 | fl6.saddr = ireq->ir_v6_loc_addr; |
4c9483b2 | 497 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
634fb979 | 498 | fl6.fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 499 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 DM |
500 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
501 | ||
0e0d44ab | 502 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 | 503 | if (IS_ERR(dst)) |
3df80d93 | 504 | goto out; |
45329e71 | 505 | } |
3df80d93 ACM |
506 | |
507 | newsk = dccp_create_openreq_child(sk, req, skb); | |
508 | if (newsk == NULL) | |
093d2823 | 509 | goto out_nonewsk; |
3df80d93 ACM |
510 | |
511 | /* | |
512 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
513 | * count here, dccp_create_openreq_child now does this for us, see the | |
514 | * comment in that function for the gory details. -acme | |
515 | */ | |
516 | ||
8e1ef0a9 | 517 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
518 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
519 | NETIF_F_TSO); | |
3df80d93 ACM |
520 | newdp6 = (struct dccp6_sock *)newsk; |
521 | newinet = inet_sk(newsk); | |
522 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
523 | newnp = inet6_sk(newsk); |
524 | ||
525 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
526 | ||
634fb979 ED |
527 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
528 | newnp->saddr = ireq->ir_v6_loc_addr; | |
529 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
530 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 531 | |
45329e71 | 532 | /* Now IPv6 options... |
3df80d93 ACM |
533 | |
534 | First: no IPv4 options. | |
535 | */ | |
f6d8bd05 | 536 | newinet->inet_opt = NULL; |
3df80d93 ACM |
537 | |
538 | /* Clone RX bits */ | |
539 | newnp->rxopt.all = np->rxopt.all; | |
540 | ||
541 | /* Clone pktoptions received with SYN */ | |
542 | newnp->pktoptions = NULL; | |
634fb979 ED |
543 | if (ireq->pktopts != NULL) { |
544 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
545 | consume_skb(ireq->pktopts); | |
546 | ireq->pktopts = NULL; | |
3df80d93 ACM |
547 | if (newnp->pktoptions) |
548 | skb_set_owner_r(newnp->pktoptions, newsk); | |
549 | } | |
550 | newnp->opt = NULL; | |
551 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 552 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 553 | |
45329e71 ACM |
554 | /* |
555 | * Clone native IPv6 options from listening socket (if any) | |
556 | * | |
557 | * Yes, keeping reference count would be much more clever, but we make | |
558 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 559 | */ |
0979e465 RL |
560 | if (np->opt != NULL) |
561 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 562 | |
d83d8461 | 563 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 564 | if (newnp->opt != NULL) |
d83d8461 ACM |
565 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
566 | newnp->opt->opt_flen); | |
3df80d93 ACM |
567 | |
568 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
569 | ||
c720c7e8 ED |
570 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
571 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 572 | |
093d2823 | 573 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
574 | inet_csk_prepare_forced_close(newsk); |
575 | dccp_done(newsk); | |
093d2823 BS |
576 | goto out; |
577 | } | |
77a6a471 | 578 | __inet_hash(newsk, NULL); |
3df80d93 ACM |
579 | |
580 | return newsk; | |
581 | ||
582 | out_overflow: | |
de0744af | 583 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
584 | out_nonewsk: |
585 | dst_release(dst); | |
3df80d93 | 586 | out: |
de0744af | 587 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
588 | return NULL; |
589 | } | |
590 | ||
591 | /* The socket must have it's spinlock held when we get | |
592 | * here. | |
593 | * | |
594 | * We have a potential double-lock case here, so even when | |
595 | * doing backlog processing we use the BH locking scheme. | |
596 | * This is because we cannot sleep with the original spinlock | |
597 | * held. | |
598 | */ | |
599 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
600 | { | |
601 | struct ipv6_pinfo *np = inet6_sk(sk); | |
602 | struct sk_buff *opt_skb = NULL; | |
603 | ||
604 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
605 | goes to IPv4 receive handler and backlogged. | |
606 | From backlog it always goes here. Kerboom... | |
607 | Fortunately, dccp_rcv_established and rcv_established | |
608 | handle them correctly, but it is not case with | |
609 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
610 | */ | |
611 | ||
612 | if (skb->protocol == htons(ETH_P_IP)) | |
613 | return dccp_v4_do_rcv(sk, skb); | |
614 | ||
fda9ef5d | 615 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
616 | goto discard; |
617 | ||
618 | /* | |
45329e71 ACM |
619 | * socket locking is here for SMP purposes as backlog rcv is currently |
620 | * called with bh processing disabled. | |
3df80d93 ACM |
621 | */ |
622 | ||
623 | /* Do Stevens' IPV6_PKTOPTIONS. | |
624 | ||
625 | Yes, guys, it is the only place in our code, where we | |
626 | may make it not affecting IPv4. | |
627 | The rest of code is protocol independent, | |
628 | and I do not like idea to uglify IPv4. | |
629 | ||
630 | Actually, all the idea behind IPV6_PKTOPTIONS | |
631 | looks not very well thought. For now we latch | |
632 | options, received in the last packet, enqueued | |
633 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 634 | --ANK (980728) |
3df80d93 ACM |
635 | */ |
636 | if (np->rxopt.all) | |
89e7e577 GR |
637 | /* |
638 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
639 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
640 | */ | |
3df80d93 ACM |
641 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
642 | ||
643 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
644 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
645 | goto reset; | |
fd169f15 | 646 | if (opt_skb) { |
89e7e577 | 647 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
648 | __kfree_skb(opt_skb); |
649 | } | |
3df80d93 ACM |
650 | return 0; |
651 | } | |
652 | ||
d83ca5ac GR |
653 | /* |
654 | * Step 3: Process LISTEN state | |
655 | * If S.state == LISTEN, | |
656 | * If P.type == Request or P contains a valid Init Cookie option, | |
657 | * (* Must scan the packet's options to check for Init | |
658 | * Cookies. Only Init Cookies are processed here, | |
659 | * however; other options are processed in Step 8. This | |
660 | * scan need only be performed if the endpoint uses Init | |
661 | * Cookies *) | |
662 | * (* Generate a new socket and switch to that socket *) | |
663 | * Set S := new socket for this port pair | |
664 | * S.state = RESPOND | |
665 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
666 | * Initialize S.GAR := S.ISS | |
667 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
668 | * Continue with S.state == RESPOND | |
669 | * (* A Response packet will be generated in Step 11 *) | |
670 | * Otherwise, | |
671 | * Generate Reset(No Connection) unless P.type == Reset | |
672 | * Drop packet and return | |
673 | * | |
674 | * NOTE: the check for the packet types is done in | |
675 | * dccp_rcv_state_process | |
676 | */ | |
45329e71 | 677 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 678 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 679 | |
45329e71 ACM |
680 | if (nsk == NULL) |
681 | goto discard; | |
3df80d93 ACM |
682 | /* |
683 | * Queue it on the new socket if the new socket is active, | |
684 | * otherwise we just shortcircuit this and continue with | |
685 | * the new socket.. | |
686 | */ | |
8109b02b | 687 | if (nsk != sk) { |
3df80d93 ACM |
688 | if (dccp_child_process(sk, nsk, skb)) |
689 | goto reset; | |
45329e71 | 690 | if (opt_skb != NULL) |
3df80d93 ACM |
691 | __kfree_skb(opt_skb); |
692 | return 0; | |
693 | } | |
694 | } | |
695 | ||
696 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
697 | goto reset; | |
fd169f15 | 698 | if (opt_skb) { |
89e7e577 | 699 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
700 | __kfree_skb(opt_skb); |
701 | } | |
3df80d93 ACM |
702 | return 0; |
703 | ||
704 | reset: | |
cfb6eeb4 | 705 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 706 | discard: |
45329e71 | 707 | if (opt_skb != NULL) |
3df80d93 ACM |
708 | __kfree_skb(opt_skb); |
709 | kfree_skb(skb); | |
710 | return 0; | |
711 | } | |
712 | ||
e5bbef20 | 713 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
714 | { |
715 | const struct dccp_hdr *dh; | |
3df80d93 | 716 | struct sock *sk; |
6f4e5fff | 717 | int min_cov; |
3df80d93 | 718 | |
6f4e5fff | 719 | /* Step 1: Check header basics */ |
3df80d93 ACM |
720 | |
721 | if (dccp_invalid_packet(skb)) | |
722 | goto discard_it; | |
723 | ||
6f4e5fff | 724 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
725 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
726 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 727 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
728 | goto discard_it; |
729 | } | |
730 | ||
3df80d93 ACM |
731 | dh = dccp_hdr(skb); |
732 | ||
fde20105 | 733 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
734 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
735 | ||
736 | if (dccp_packet_without_ack(skb)) | |
737 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
738 | else | |
739 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
740 | ||
741 | /* Step 2: | |
8109b02b | 742 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 | 743 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
870c3151 ED |
744 | dh->dccph_sport, dh->dccph_dport, |
745 | inet6_iif(skb)); | |
45329e71 | 746 | /* |
3df80d93 | 747 | * Step 2: |
8109b02b | 748 | * If no socket ... |
3df80d93 | 749 | */ |
d23c7107 GR |
750 | if (sk == NULL) { |
751 | dccp_pr_debug("failed to look up flow ID in table and " | |
752 | "get corresponding socket\n"); | |
3df80d93 | 753 | goto no_dccp_socket; |
d23c7107 | 754 | } |
3df80d93 | 755 | |
45329e71 | 756 | /* |
3df80d93 | 757 | * Step 2: |
8109b02b | 758 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
759 | * Generate Reset(No Connection) unless P.type == Reset |
760 | * Drop packet and return | |
761 | */ | |
d23c7107 GR |
762 | if (sk->sk_state == DCCP_TIME_WAIT) { |
763 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
764 | inet_twsk_put(inet_twsk(sk)); | |
765 | goto no_dccp_socket; | |
766 | } | |
3df80d93 | 767 | |
6f4e5fff GR |
768 | /* |
769 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
770 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
771 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
772 | */ |
773 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
774 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
775 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
776 | dh->dccph_cscov, min_cov); | |
777 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
778 | goto discard_and_relse; | |
779 | } | |
780 | ||
3df80d93 ACM |
781 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
782 | goto discard_and_relse; | |
783 | ||
58a5a7b9 | 784 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
785 | |
786 | no_dccp_socket: | |
787 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
788 | goto discard_it; | |
789 | /* | |
790 | * Step 2: | |
8109b02b | 791 | * If no socket ... |
3df80d93 ACM |
792 | * Generate Reset(No Connection) unless P.type == Reset |
793 | * Drop packet and return | |
794 | */ | |
795 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
796 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
797 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 798 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 799 | } |
3df80d93 | 800 | |
d23c7107 | 801 | discard_it: |
3df80d93 ACM |
802 | kfree_skb(skb); |
803 | return 0; | |
804 | ||
805 | discard_and_relse: | |
806 | sock_put(sk); | |
807 | goto discard_it; | |
3df80d93 ACM |
808 | } |
809 | ||
73c9e02c GR |
810 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
811 | int addr_len) | |
812 | { | |
813 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
814 | struct inet_connection_sock *icsk = inet_csk(sk); | |
815 | struct inet_sock *inet = inet_sk(sk); | |
816 | struct ipv6_pinfo *np = inet6_sk(sk); | |
817 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 818 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 819 | struct flowi6 fl6; |
73c9e02c GR |
820 | struct dst_entry *dst; |
821 | int addr_type; | |
822 | int err; | |
823 | ||
824 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
825 | ||
826 | if (addr_len < SIN6_LEN_RFC2133) | |
827 | return -EINVAL; | |
828 | ||
829 | if (usin->sin6_family != AF_INET6) | |
830 | return -EAFNOSUPPORT; | |
831 | ||
4c9483b2 | 832 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
833 | |
834 | if (np->sndflow) { | |
4c9483b2 DM |
835 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
836 | IP6_ECN_flow_init(fl6.flowlabel); | |
837 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 838 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 839 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
840 | if (flowlabel == NULL) |
841 | return -EINVAL; | |
73c9e02c GR |
842 | fl6_sock_release(flowlabel); |
843 | } | |
844 | } | |
845 | /* | |
846 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
847 | */ | |
848 | if (ipv6_addr_any(&usin->sin6_addr)) | |
849 | usin->sin6_addr.s6_addr[15] = 1; | |
850 | ||
851 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
852 | ||
853 | if (addr_type & IPV6_ADDR_MULTICAST) | |
854 | return -ENETUNREACH; | |
855 | ||
856 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
857 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
858 | usin->sin6_scope_id) { | |
859 | /* If interface is set while binding, indices | |
860 | * must coincide. | |
861 | */ | |
862 | if (sk->sk_bound_dev_if && | |
863 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
864 | return -EINVAL; | |
865 | ||
866 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
867 | } | |
868 | ||
869 | /* Connect to link-local address requires an interface */ | |
870 | if (!sk->sk_bound_dev_if) | |
871 | return -EINVAL; | |
872 | } | |
873 | ||
efe4208f | 874 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 875 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
876 | |
877 | /* | |
878 | * DCCP over IPv4 | |
879 | */ | |
880 | if (addr_type == IPV6_ADDR_MAPPED) { | |
881 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
882 | struct sockaddr_in sin; | |
883 | ||
884 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
885 | ||
886 | if (__ipv6_only_sock(sk)) | |
887 | return -ENETUNREACH; | |
888 | ||
889 | sin.sin_family = AF_INET; | |
890 | sin.sin_port = usin->sin6_port; | |
891 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
892 | ||
893 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
894 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
895 | ||
896 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
897 | if (err) { | |
898 | icsk->icsk_ext_hdr_len = exthdrlen; | |
899 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
900 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
901 | goto failure; | |
73c9e02c | 902 | } |
d1e559d0 | 903 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
904 | return err; |
905 | } | |
906 | ||
efe4208f ED |
907 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
908 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 909 | |
4c9483b2 | 910 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 911 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 912 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 913 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
914 | fl6.fl6_dport = usin->sin6_port; |
915 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 916 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 917 | |
4c9483b2 | 918 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 919 | |
0e0d44ab | 920 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
921 | if (IS_ERR(dst)) { |
922 | err = PTR_ERR(dst); | |
73c9e02c | 923 | goto failure; |
14e50e57 | 924 | } |
73c9e02c GR |
925 | |
926 | if (saddr == NULL) { | |
4c9483b2 | 927 | saddr = &fl6.saddr; |
efe4208f | 928 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
929 | } |
930 | ||
931 | /* set the source address */ | |
4e3fd7a0 | 932 | np->saddr = *saddr; |
c720c7e8 | 933 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
934 | |
935 | __ip6_dst_store(sk, dst, NULL, NULL); | |
936 | ||
937 | icsk->icsk_ext_hdr_len = 0; | |
938 | if (np->opt != NULL) | |
939 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
940 | np->opt->opt_nflen); | |
941 | ||
c720c7e8 | 942 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
943 | |
944 | dccp_set_state(sk, DCCP_REQUESTING); | |
945 | err = inet6_hash_connect(&dccp_death_row, sk); | |
946 | if (err) | |
947 | goto late_failure; | |
d7f7365f GR |
948 | |
949 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 950 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
951 | inet->inet_sport, |
952 | inet->inet_dport); | |
73c9e02c GR |
953 | err = dccp_connect(sk); |
954 | if (err) | |
955 | goto late_failure; | |
956 | ||
957 | return 0; | |
958 | ||
959 | late_failure: | |
960 | dccp_set_state(sk, DCCP_CLOSED); | |
961 | __sk_dst_reset(sk); | |
962 | failure: | |
c720c7e8 | 963 | inet->inet_dport = 0; |
73c9e02c GR |
964 | sk->sk_route_caps = 0; |
965 | return err; | |
966 | } | |
967 | ||
3b401a81 | 968 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
969 | .queue_xmit = inet6_csk_xmit, |
970 | .send_check = dccp_v6_send_check, | |
971 | .rebuild_header = inet6_sk_rebuild_header, | |
972 | .conn_request = dccp_v6_conn_request, | |
973 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
974 | .net_header_len = sizeof(struct ipv6hdr), | |
975 | .setsockopt = ipv6_setsockopt, | |
976 | .getsockopt = ipv6_getsockopt, | |
977 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
978 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 979 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 980 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
981 | .compat_setsockopt = compat_ipv6_setsockopt, |
982 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 983 | #endif |
3df80d93 ACM |
984 | }; |
985 | ||
986 | /* | |
987 | * DCCP over IPv4 via INET6 API | |
988 | */ | |
3b401a81 | 989 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
990 | .queue_xmit = ip_queue_xmit, |
991 | .send_check = dccp_v4_send_check, | |
992 | .rebuild_header = inet_sk_rebuild_header, | |
993 | .conn_request = dccp_v6_conn_request, | |
994 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
995 | .net_header_len = sizeof(struct iphdr), | |
996 | .setsockopt = ipv6_setsockopt, | |
997 | .getsockopt = ipv6_getsockopt, | |
998 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
999 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
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 | /* NOTE: A lot of things set to zero explicitly by call to | |
1007 | * sk_alloc() so need not be done here. | |
1008 | */ | |
1009 | static int dccp_v6_init_sock(struct sock *sk) | |
1010 | { | |
72478873 ACM |
1011 | static __u8 dccp_v6_ctl_sock_initialized; |
1012 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1013 | |
72478873 ACM |
1014 | if (err == 0) { |
1015 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1016 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1017 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1018 | } |
3df80d93 ACM |
1019 | |
1020 | return err; | |
1021 | } | |
1022 | ||
7d06b2e0 | 1023 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1024 | { |
3e0fadc5 | 1025 | dccp_destroy_sock(sk); |
7d06b2e0 | 1026 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1027 | } |
1028 | ||
73c9e02c GR |
1029 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1030 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1031 | }; | |
1032 | ||
3df80d93 | 1033 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1034 | .name = "DCCPv6", |
1035 | .owner = THIS_MODULE, | |
1036 | .close = dccp_close, | |
1037 | .connect = dccp_v6_connect, | |
1038 | .disconnect = dccp_disconnect, | |
1039 | .ioctl = dccp_ioctl, | |
1040 | .init = dccp_v6_init_sock, | |
1041 | .setsockopt = dccp_setsockopt, | |
1042 | .getsockopt = dccp_getsockopt, | |
1043 | .sendmsg = dccp_sendmsg, | |
1044 | .recvmsg = dccp_recvmsg, | |
1045 | .backlog_rcv = dccp_v6_do_rcv, | |
77a6a471 | 1046 | .hash = inet_hash, |
ab1e0a13 | 1047 | .unhash = inet_unhash, |
543d9cfe | 1048 | .accept = inet_csk_accept, |
ab1e0a13 | 1049 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1050 | .shutdown = dccp_shutdown, |
1051 | .destroy = dccp_v6_destroy_sock, | |
1052 | .orphan_count = &dccp_orphan_count, | |
1053 | .max_header = MAX_DCCP_HEADER, | |
1054 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1055 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1056 | .rsk_prot = &dccp6_request_sock_ops, |
1057 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1058 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1059 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1060 | .compat_setsockopt = compat_dccp_setsockopt, |
1061 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1062 | #endif |
3df80d93 ACM |
1063 | }; |
1064 | ||
41135cc8 | 1065 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1066 | .handler = dccp_v6_rcv, |
1067 | .err_handler = dccp_v6_err, | |
1068 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1069 | }; |
1070 | ||
5708e868 | 1071 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1072 | .family = PF_INET6, |
1073 | .owner = THIS_MODULE, | |
1074 | .release = inet6_release, | |
1075 | .bind = inet6_bind, | |
1076 | .connect = inet_stream_connect, | |
1077 | .socketpair = sock_no_socketpair, | |
1078 | .accept = inet_accept, | |
1079 | .getname = inet6_getname, | |
1080 | .poll = dccp_poll, | |
1081 | .ioctl = inet6_ioctl, | |
1082 | .listen = inet_dccp_listen, | |
1083 | .shutdown = inet_shutdown, | |
1084 | .setsockopt = sock_common_setsockopt, | |
1085 | .getsockopt = sock_common_getsockopt, | |
1086 | .sendmsg = inet_sendmsg, | |
1087 | .recvmsg = sock_common_recvmsg, | |
1088 | .mmap = sock_no_mmap, | |
1089 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1090 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1091 | .compat_setsockopt = compat_sock_common_setsockopt, |
1092 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1093 | #endif |
3df80d93 ACM |
1094 | }; |
1095 | ||
1096 | static struct inet_protosw dccp_v6_protosw = { | |
1097 | .type = SOCK_DCCP, | |
1098 | .protocol = IPPROTO_DCCP, | |
1099 | .prot = &dccp_v6_prot, | |
1100 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1101 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1102 | }; |
1103 | ||
2c8c1e72 | 1104 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1105 | { |
d14a0ebd GR |
1106 | if (dccp_hashinfo.bhash == NULL) |
1107 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1108 | |
d14a0ebd GR |
1109 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1110 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1111 | } |
1112 | ||
2c8c1e72 | 1113 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1114 | { |
334527d3 | 1115 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1116 | } |
1117 | ||
1118 | static struct pernet_operations dccp_v6_ops = { | |
1119 | .init = dccp_v6_init_net, | |
1120 | .exit = dccp_v6_exit_net, | |
1121 | }; | |
1122 | ||
3df80d93 ACM |
1123 | static int __init dccp_v6_init(void) |
1124 | { | |
1125 | int err = proto_register(&dccp_v6_prot, 1); | |
1126 | ||
1127 | if (err != 0) | |
1128 | goto out; | |
1129 | ||
1130 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1131 | if (err != 0) | |
1132 | goto out_unregister_proto; | |
1133 | ||
1134 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1135 | |
8231bd27 PE |
1136 | err = register_pernet_subsys(&dccp_v6_ops); |
1137 | if (err != 0) | |
1138 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1139 | out: |
1140 | return err; | |
8231bd27 PE |
1141 | |
1142 | out_destroy_ctl_sock: | |
72478873 ACM |
1143 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1144 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1145 | out_unregister_proto: |
1146 | proto_unregister(&dccp_v6_prot); | |
1147 | goto out; | |
1148 | } | |
1149 | ||
1150 | static void __exit dccp_v6_exit(void) | |
1151 | { | |
8231bd27 | 1152 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1153 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1154 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1155 | proto_unregister(&dccp_v6_prot); | |
1156 | } | |
1157 | ||
1158 | module_init(dccp_v6_init); | |
1159 | module_exit(dccp_v6_exit); | |
1160 | ||
1161 | /* | |
1162 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1163 | * values directly, Also cover the case where the protocol is not specified, | |
1164 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1165 | */ | |
7131c6c7 JD |
1166 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1167 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1168 | MODULE_LICENSE("GPL"); |
1169 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1170 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |