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; |
bd380617 | 86 | const struct dccp_hdr *dh; |
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 | |
bd380617 ED |
94 | /* Only need dccph_dport & dccph_sport which are the first |
95 | * 4 bytes in dccp header. | |
96 | * Our caller (icmpv6_notify()) already pulled 8 bytes for us. | |
97 | */ | |
98 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
99 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
100 | dh = (struct dccp_hdr *)(skb->data + offset); | |
860239c5 | 101 | |
ca12a1a4 | 102 | sk = inet6_lookup(net, &dccp_hashinfo, |
671a1c74 | 103 | &hdr->daddr, dh->dccph_dport, |
d86e0dac | 104 | &hdr->saddr, dh->dccph_sport, inet6_iif(skb)); |
3df80d93 ACM |
105 | |
106 | if (sk == NULL) { | |
e41b5368 DL |
107 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
108 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
109 | return; |
110 | } | |
111 | ||
112 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 113 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
114 | return; |
115 | } | |
116 | ||
117 | bh_lock_sock(sk); | |
118 | if (sock_owned_by_user(sk)) | |
de0744af | 119 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
120 | |
121 | if (sk->sk_state == DCCP_CLOSED) | |
122 | goto out; | |
123 | ||
e0bcfb0c WY |
124 | dp = dccp_sk(sk); |
125 | seq = dccp_hdr_seq(dh); | |
126 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && | |
127 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
128 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
129 | goto out; | |
130 | } | |
131 | ||
3df80d93 ACM |
132 | np = inet6_sk(sk); |
133 | ||
ec18d9a2 DM |
134 | if (type == NDISC_REDIRECT) { |
135 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
136 | ||
1ed5c48f | 137 | if (dst) |
6700c270 | 138 | dst->ops->redirect(dst, sk, skb); |
f25e4f35 | 139 | goto out; |
ec18d9a2 DM |
140 | } |
141 | ||
3df80d93 | 142 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
143 | struct dst_entry *dst = NULL; |
144 | ||
145 | if (sock_owned_by_user(sk)) | |
146 | goto out; | |
147 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
148 | goto out; | |
149 | ||
35ad9b9c DM |
150 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
151 | if (!dst) | |
152 | goto out; | |
153 | ||
154 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 155 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
156 | goto out; |
157 | } | |
158 | ||
159 | icmpv6_err_convert(type, code, &err); | |
160 | ||
3df80d93 ACM |
161 | /* Might be for an request_sock */ |
162 | switch (sk->sk_state) { | |
163 | struct request_sock *req, **prev; | |
164 | case DCCP_LISTEN: | |
165 | if (sock_owned_by_user(sk)) | |
166 | goto out; | |
167 | ||
168 | req = inet6_csk_search_req(sk, &prev, dh->dccph_dport, | |
169 | &hdr->daddr, &hdr->saddr, | |
170 | inet6_iif(skb)); | |
45329e71 | 171 | if (req == NULL) |
3df80d93 ACM |
172 | goto out; |
173 | ||
45329e71 ACM |
174 | /* |
175 | * ICMPs are not backlogged, hence we cannot get an established | |
176 | * socket here. | |
3df80d93 | 177 | */ |
547b792c | 178 | WARN_ON(req->sk != NULL); |
3df80d93 | 179 | |
f541fb7e SJ |
180 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
181 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 182 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
3df80d93 ACM |
183 | goto out; |
184 | } | |
185 | ||
186 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
187 | goto out; | |
188 | ||
189 | case DCCP_REQUESTING: | |
190 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 191 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
192 | if (!sock_owned_by_user(sk)) { |
193 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
194 | sk->sk_err = err; | |
195 | /* | |
196 | * Wake people up to see the error | |
197 | * (see connect in sock.c) | |
198 | */ | |
199 | sk->sk_error_report(sk); | |
3df80d93 ACM |
200 | dccp_done(sk); |
201 | } else | |
202 | sk->sk_err_soft = err; | |
203 | goto out; | |
204 | } | |
205 | ||
206 | if (!sock_owned_by_user(sk) && np->recverr) { | |
207 | sk->sk_err = err; | |
208 | sk->sk_error_report(sk); | |
209 | } else | |
210 | sk->sk_err_soft = err; | |
211 | ||
212 | out: | |
213 | bh_unlock_sock(sk); | |
214 | sock_put(sk); | |
215 | } | |
216 | ||
217 | ||
1a2c6181 | 218 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 ACM |
219 | { |
220 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
221 | struct ipv6_pinfo *np = inet6_sk(sk); | |
222 | struct sk_buff *skb; | |
20c59de2 | 223 | struct in6_addr *final_p, final; |
4c9483b2 | 224 | struct flowi6 fl6; |
3df80d93 | 225 | int err = -1; |
fd80eb94 | 226 | struct dst_entry *dst; |
3df80d93 | 227 | |
4c9483b2 DM |
228 | memset(&fl6, 0, sizeof(fl6)); |
229 | fl6.flowi6_proto = IPPROTO_DCCP; | |
4e3fd7a0 AD |
230 | fl6.daddr = ireq6->rmt_addr; |
231 | fl6.saddr = ireq6->loc_addr; | |
4c9483b2 DM |
232 | fl6.flowlabel = 0; |
233 | fl6.flowi6_oif = ireq6->iif; | |
1958b856 DM |
234 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
235 | fl6.fl6_sport = inet_rsk(req)->loc_port; | |
4c9483b2 | 236 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 237 | |
3df80d93 | 238 | |
0979e465 | 239 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
3df80d93 | 240 | |
4c9483b2 | 241 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); |
68d0c6d3 DM |
242 | if (IS_ERR(dst)) { |
243 | err = PTR_ERR(dst); | |
244 | dst = NULL; | |
fd80eb94 | 245 | goto done; |
68d0c6d3 | 246 | } |
3df80d93 ACM |
247 | |
248 | skb = dccp_make_response(sk, dst, req); | |
249 | if (skb != NULL) { | |
250 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 251 | |
6f4e5fff GR |
252 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
253 | &ireq6->loc_addr, | |
254 | &ireq6->rmt_addr); | |
4e3fd7a0 | 255 | fl6.daddr = ireq6->rmt_addr; |
0979e465 | 256 | err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
b9df3cb8 | 257 | err = net_xmit_eval(err); |
3df80d93 ACM |
258 | } |
259 | ||
260 | done: | |
0cbd7825 | 261 | dst_release(dst); |
3df80d93 ACM |
262 | return err; |
263 | } | |
264 | ||
265 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
266 | { | |
d99a7bd2 | 267 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3df80d93 ACM |
268 | if (inet6_rsk(req)->pktopts != NULL) |
269 | kfree_skb(inet6_rsk(req)->pktopts); | |
270 | } | |
271 | ||
cfb6eeb4 | 272 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 273 | { |
b71d1d42 | 274 | const struct ipv6hdr *rxip6h; |
3df80d93 | 275 | struct sk_buff *skb; |
4c9483b2 | 276 | struct flowi6 fl6; |
adf30907 | 277 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 278 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 279 | struct dst_entry *dst; |
3df80d93 | 280 | |
e356d37a | 281 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
282 | return; |
283 | ||
284 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 285 | return; |
3df80d93 | 286 | |
02047741 | 287 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 288 | if (skb == NULL) |
8109b02b | 289 | return; |
3df80d93 | 290 | |
0660e03f | 291 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
292 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
293 | &rxip6h->daddr); | |
6f4e5fff | 294 | |
4c9483b2 | 295 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
296 | fl6.daddr = rxip6h->saddr; |
297 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 298 | |
4c9483b2 DM |
299 | fl6.flowi6_proto = IPPROTO_DCCP; |
300 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
301 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
302 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 303 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
304 | |
305 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
4c9483b2 | 306 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
307 | if (!IS_ERR(dst)) { |
308 | skb_dst_set(skb, dst); | |
b903d324 | 309 | ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); |
68d0c6d3 DM |
310 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
311 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
312 | return; | |
3df80d93 ACM |
313 | } |
314 | ||
315 | kfree_skb(skb); | |
316 | } | |
317 | ||
73c9e02c GR |
318 | static struct request_sock_ops dccp6_request_sock_ops = { |
319 | .family = AF_INET6, | |
320 | .obj_size = sizeof(struct dccp6_request_sock), | |
321 | .rtx_syn_ack = dccp_v6_send_response, | |
322 | .send_ack = dccp_reqsk_send_ack, | |
323 | .destructor = dccp_v6_reqsk_destructor, | |
324 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 325 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
326 | }; |
327 | ||
3df80d93 ACM |
328 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
329 | { | |
330 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 331 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
3df80d93 ACM |
332 | struct sock *nsk; |
333 | struct request_sock **prev; | |
334 | /* Find possible connection requests. */ | |
335 | struct request_sock *req = inet6_csk_search_req(sk, &prev, | |
336 | dh->dccph_sport, | |
337 | &iph->saddr, | |
338 | &iph->daddr, | |
339 | inet6_iif(skb)); | |
340 | if (req != NULL) | |
341 | return dccp_check_req(sk, skb, req, prev); | |
342 | ||
671a1c74 | 343 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
344 | &iph->saddr, dh->dccph_sport, |
345 | &iph->daddr, ntohs(dh->dccph_dport), | |
346 | inet6_iif(skb)); | |
3df80d93 ACM |
347 | if (nsk != NULL) { |
348 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
349 | bh_lock_sock(nsk); | |
350 | return nsk; | |
351 | } | |
9469c7b4 | 352 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
353 | return NULL; |
354 | } | |
355 | ||
356 | return sk; | |
357 | } | |
358 | ||
359 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
360 | { | |
3df80d93 ACM |
361 | struct request_sock *req; |
362 | struct dccp_request_sock *dreq; | |
363 | struct inet6_request_sock *ireq6; | |
364 | struct ipv6_pinfo *np = inet6_sk(sk); | |
8109b02b | 365 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 366 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
367 | |
368 | if (skb->protocol == htons(ETH_P_IP)) | |
369 | return dccp_v4_conn_request(sk, skb); | |
370 | ||
371 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 372 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
373 | |
374 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 375 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 376 | goto drop; |
8109b02b | 377 | } |
3df80d93 | 378 | /* |
45329e71 | 379 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 380 | */ |
4a5409a5 | 381 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 382 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 383 | goto drop; |
3df80d93 ACM |
384 | |
385 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
386 | goto drop; | |
387 | ||
82709531 | 388 | req = inet6_reqsk_alloc(&dccp6_request_sock_ops); |
3df80d93 ACM |
389 | if (req == NULL) |
390 | goto drop; | |
391 | ||
ac75773c GR |
392 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
393 | goto drop_and_free; | |
3df80d93 | 394 | |
8b819412 GR |
395 | dreq = dccp_rsk(req); |
396 | if (dccp_parse_options(sk, dreq, skb)) | |
397 | goto drop_and_free; | |
398 | ||
4237c75c VY |
399 | if (security_inet_conn_request(sk, skb, req)) |
400 | goto drop_and_free; | |
401 | ||
3df80d93 | 402 | ireq6 = inet6_rsk(req); |
4e3fd7a0 AD |
403 | ireq6->rmt_addr = ipv6_hdr(skb)->saddr; |
404 | ireq6->loc_addr = ipv6_hdr(skb)->daddr; | |
3df80d93 ACM |
405 | |
406 | if (ipv6_opt_accepted(sk, skb) || | |
407 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
408 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
409 | atomic_inc(&skb->users); | |
410 | ireq6->pktopts = skb; | |
411 | } | |
412 | ireq6->iif = sk->sk_bound_dev_if; | |
413 | ||
414 | /* So that link locals have meaning */ | |
415 | if (!sk->sk_bound_dev_if && | |
416 | ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
417 | ireq6->iif = inet6_iif(skb); | |
418 | ||
45329e71 | 419 | /* |
3df80d93 ACM |
420 | * Step 3: Process LISTEN state |
421 | * | |
d83ca5ac | 422 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 423 | * |
f541fb7e | 424 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 425 | */ |
3df80d93 | 426 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 427 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 428 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 429 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
430 | dreq->dreq_service = service; |
431 | ||
1a2c6181 | 432 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
433 | goto drop_and_free; |
434 | ||
435 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
436 | return 0; | |
437 | ||
438 | drop_and_free: | |
439 | reqsk_free(req); | |
440 | drop: | |
441 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
442 | return -1; |
443 | } | |
444 | ||
445 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
446 | struct sk_buff *skb, | |
447 | struct request_sock *req, | |
448 | struct dst_entry *dst) | |
449 | { | |
450 | struct inet6_request_sock *ireq6 = inet6_rsk(req); | |
451 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
452 | struct inet_sock *newinet; | |
3df80d93 ACM |
453 | struct dccp6_sock *newdp6; |
454 | struct sock *newsk; | |
3df80d93 ACM |
455 | |
456 | if (skb->protocol == htons(ETH_P_IP)) { | |
457 | /* | |
458 | * v6 mapped | |
459 | */ | |
3df80d93 | 460 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 461 | if (newsk == NULL) |
3df80d93 ACM |
462 | return NULL; |
463 | ||
464 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
465 | newinet = inet_sk(newsk); |
466 | newinet->pinet6 = &newdp6->inet6; | |
467 | newnp = inet6_sk(newsk); | |
468 | ||
469 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
470 | ||
c720c7e8 | 471 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
3df80d93 | 472 | |
c720c7e8 | 473 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
3df80d93 | 474 | |
4e3fd7a0 | 475 | newnp->rcv_saddr = newnp->saddr; |
3df80d93 ACM |
476 | |
477 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
478 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
479 | newnp->pktoptions = NULL; | |
480 | newnp->opt = NULL; | |
481 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 482 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
483 | |
484 | /* | |
485 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
486 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
487 | * that function for the gory details. -acme | |
488 | */ | |
489 | ||
490 | /* It is tricky place. Until this moment IPv4 tcp | |
491 | worked with IPv6 icsk.icsk_af_ops. | |
492 | Sync it now. | |
493 | */ | |
d83d8461 | 494 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
495 | |
496 | return newsk; | |
497 | } | |
498 | ||
3df80d93 ACM |
499 | |
500 | if (sk_acceptq_is_full(sk)) | |
501 | goto out_overflow; | |
502 | ||
3df80d93 | 503 | if (dst == NULL) { |
20c59de2 | 504 | struct in6_addr *final_p, final; |
4c9483b2 DM |
505 | struct flowi6 fl6; |
506 | ||
507 | memset(&fl6, 0, sizeof(fl6)); | |
508 | fl6.flowi6_proto = IPPROTO_DCCP; | |
4e3fd7a0 | 509 | fl6.daddr = ireq6->rmt_addr; |
0979e465 | 510 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
4e3fd7a0 | 511 | fl6.saddr = ireq6->loc_addr; |
4c9483b2 | 512 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
513 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
514 | fl6.fl6_sport = inet_rsk(req)->loc_port; | |
4c9483b2 DM |
515 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
516 | ||
517 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); | |
68d0c6d3 | 518 | if (IS_ERR(dst)) |
3df80d93 | 519 | goto out; |
45329e71 | 520 | } |
3df80d93 ACM |
521 | |
522 | newsk = dccp_create_openreq_child(sk, req, skb); | |
523 | if (newsk == NULL) | |
093d2823 | 524 | goto out_nonewsk; |
3df80d93 ACM |
525 | |
526 | /* | |
527 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
528 | * count here, dccp_create_openreq_child now does this for us, see the | |
529 | * comment in that function for the gory details. -acme | |
530 | */ | |
531 | ||
8e1ef0a9 | 532 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
533 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
534 | NETIF_F_TSO); | |
3df80d93 ACM |
535 | newdp6 = (struct dccp6_sock *)newsk; |
536 | newinet = inet_sk(newsk); | |
537 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
538 | newnp = inet6_sk(newsk); |
539 | ||
540 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
541 | ||
4e3fd7a0 AD |
542 | newnp->daddr = ireq6->rmt_addr; |
543 | newnp->saddr = ireq6->loc_addr; | |
544 | newnp->rcv_saddr = ireq6->loc_addr; | |
3df80d93 ACM |
545 | newsk->sk_bound_dev_if = ireq6->iif; |
546 | ||
45329e71 | 547 | /* Now IPv6 options... |
3df80d93 ACM |
548 | |
549 | First: no IPv4 options. | |
550 | */ | |
f6d8bd05 | 551 | newinet->inet_opt = NULL; |
3df80d93 ACM |
552 | |
553 | /* Clone RX bits */ | |
554 | newnp->rxopt.all = np->rxopt.all; | |
555 | ||
556 | /* Clone pktoptions received with SYN */ | |
557 | newnp->pktoptions = NULL; | |
558 | if (ireq6->pktopts != NULL) { | |
559 | newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC); | |
7604adc2 | 560 | consume_skb(ireq6->pktopts); |
3df80d93 ACM |
561 | ireq6->pktopts = NULL; |
562 | if (newnp->pktoptions) | |
563 | skb_set_owner_r(newnp->pktoptions, newsk); | |
564 | } | |
565 | newnp->opt = NULL; | |
566 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 567 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 568 | |
45329e71 ACM |
569 | /* |
570 | * Clone native IPv6 options from listening socket (if any) | |
571 | * | |
572 | * Yes, keeping reference count would be much more clever, but we make | |
573 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 574 | */ |
0979e465 RL |
575 | if (np->opt != NULL) |
576 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 577 | |
d83d8461 | 578 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 579 | if (newnp->opt != NULL) |
d83d8461 ACM |
580 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
581 | newnp->opt->opt_flen); | |
3df80d93 ACM |
582 | |
583 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
584 | ||
c720c7e8 ED |
585 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
586 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 587 | |
093d2823 | 588 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
589 | inet_csk_prepare_forced_close(newsk); |
590 | dccp_done(newsk); | |
093d2823 BS |
591 | goto out; |
592 | } | |
9327f705 | 593 | __inet6_hash(newsk, NULL); |
3df80d93 ACM |
594 | |
595 | return newsk; | |
596 | ||
597 | out_overflow: | |
de0744af | 598 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
599 | out_nonewsk: |
600 | dst_release(dst); | |
3df80d93 | 601 | out: |
de0744af | 602 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
603 | return NULL; |
604 | } | |
605 | ||
606 | /* The socket must have it's spinlock held when we get | |
607 | * here. | |
608 | * | |
609 | * We have a potential double-lock case here, so even when | |
610 | * doing backlog processing we use the BH locking scheme. | |
611 | * This is because we cannot sleep with the original spinlock | |
612 | * held. | |
613 | */ | |
614 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
615 | { | |
616 | struct ipv6_pinfo *np = inet6_sk(sk); | |
617 | struct sk_buff *opt_skb = NULL; | |
618 | ||
619 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
620 | goes to IPv4 receive handler and backlogged. | |
621 | From backlog it always goes here. Kerboom... | |
622 | Fortunately, dccp_rcv_established and rcv_established | |
623 | handle them correctly, but it is not case with | |
624 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
625 | */ | |
626 | ||
627 | if (skb->protocol == htons(ETH_P_IP)) | |
628 | return dccp_v4_do_rcv(sk, skb); | |
629 | ||
fda9ef5d | 630 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
631 | goto discard; |
632 | ||
633 | /* | |
45329e71 ACM |
634 | * socket locking is here for SMP purposes as backlog rcv is currently |
635 | * called with bh processing disabled. | |
3df80d93 ACM |
636 | */ |
637 | ||
638 | /* Do Stevens' IPV6_PKTOPTIONS. | |
639 | ||
640 | Yes, guys, it is the only place in our code, where we | |
641 | may make it not affecting IPv4. | |
642 | The rest of code is protocol independent, | |
643 | and I do not like idea to uglify IPv4. | |
644 | ||
645 | Actually, all the idea behind IPV6_PKTOPTIONS | |
646 | looks not very well thought. For now we latch | |
647 | options, received in the last packet, enqueued | |
648 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 649 | --ANK (980728) |
3df80d93 ACM |
650 | */ |
651 | if (np->rxopt.all) | |
89e7e577 GR |
652 | /* |
653 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
654 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
655 | */ | |
3df80d93 ACM |
656 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
657 | ||
658 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
659 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
660 | goto reset; | |
fd169f15 | 661 | if (opt_skb) { |
89e7e577 | 662 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
663 | __kfree_skb(opt_skb); |
664 | } | |
3df80d93 ACM |
665 | return 0; |
666 | } | |
667 | ||
d83ca5ac GR |
668 | /* |
669 | * Step 3: Process LISTEN state | |
670 | * If S.state == LISTEN, | |
671 | * If P.type == Request or P contains a valid Init Cookie option, | |
672 | * (* Must scan the packet's options to check for Init | |
673 | * Cookies. Only Init Cookies are processed here, | |
674 | * however; other options are processed in Step 8. This | |
675 | * scan need only be performed if the endpoint uses Init | |
676 | * Cookies *) | |
677 | * (* Generate a new socket and switch to that socket *) | |
678 | * Set S := new socket for this port pair | |
679 | * S.state = RESPOND | |
680 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
681 | * Initialize S.GAR := S.ISS | |
682 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
683 | * Continue with S.state == RESPOND | |
684 | * (* A Response packet will be generated in Step 11 *) | |
685 | * Otherwise, | |
686 | * Generate Reset(No Connection) unless P.type == Reset | |
687 | * Drop packet and return | |
688 | * | |
689 | * NOTE: the check for the packet types is done in | |
690 | * dccp_rcv_state_process | |
691 | */ | |
45329e71 | 692 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 693 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 694 | |
45329e71 ACM |
695 | if (nsk == NULL) |
696 | goto discard; | |
3df80d93 ACM |
697 | /* |
698 | * Queue it on the new socket if the new socket is active, | |
699 | * otherwise we just shortcircuit this and continue with | |
700 | * the new socket.. | |
701 | */ | |
8109b02b | 702 | if (nsk != sk) { |
3df80d93 ACM |
703 | if (dccp_child_process(sk, nsk, skb)) |
704 | goto reset; | |
45329e71 | 705 | if (opt_skb != NULL) |
3df80d93 ACM |
706 | __kfree_skb(opt_skb); |
707 | return 0; | |
708 | } | |
709 | } | |
710 | ||
711 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
712 | goto reset; | |
fd169f15 | 713 | if (opt_skb) { |
89e7e577 | 714 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
715 | __kfree_skb(opt_skb); |
716 | } | |
3df80d93 ACM |
717 | return 0; |
718 | ||
719 | reset: | |
cfb6eeb4 | 720 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 721 | discard: |
45329e71 | 722 | if (opt_skb != NULL) |
3df80d93 ACM |
723 | __kfree_skb(opt_skb); |
724 | kfree_skb(skb); | |
725 | return 0; | |
726 | } | |
727 | ||
e5bbef20 | 728 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
729 | { |
730 | const struct dccp_hdr *dh; | |
3df80d93 | 731 | struct sock *sk; |
6f4e5fff | 732 | int min_cov; |
3df80d93 | 733 | |
6f4e5fff | 734 | /* Step 1: Check header basics */ |
3df80d93 ACM |
735 | |
736 | if (dccp_invalid_packet(skb)) | |
737 | goto discard_it; | |
738 | ||
6f4e5fff | 739 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
740 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
741 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 742 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
743 | goto discard_it; |
744 | } | |
745 | ||
3df80d93 ACM |
746 | dh = dccp_hdr(skb); |
747 | ||
fde20105 | 748 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
749 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
750 | ||
751 | if (dccp_packet_without_ack(skb)) | |
752 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
753 | else | |
754 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
755 | ||
756 | /* Step 2: | |
8109b02b | 757 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
758 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
759 | dh->dccph_sport, dh->dccph_dport); | |
45329e71 | 760 | /* |
3df80d93 | 761 | * Step 2: |
8109b02b | 762 | * If no socket ... |
3df80d93 | 763 | */ |
d23c7107 GR |
764 | if (sk == NULL) { |
765 | dccp_pr_debug("failed to look up flow ID in table and " | |
766 | "get corresponding socket\n"); | |
3df80d93 | 767 | goto no_dccp_socket; |
d23c7107 | 768 | } |
3df80d93 | 769 | |
45329e71 | 770 | /* |
3df80d93 | 771 | * Step 2: |
8109b02b | 772 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
773 | * Generate Reset(No Connection) unless P.type == Reset |
774 | * Drop packet and return | |
775 | */ | |
d23c7107 GR |
776 | if (sk->sk_state == DCCP_TIME_WAIT) { |
777 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
778 | inet_twsk_put(inet_twsk(sk)); | |
779 | goto no_dccp_socket; | |
780 | } | |
3df80d93 | 781 | |
6f4e5fff GR |
782 | /* |
783 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
784 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
785 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
786 | */ |
787 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
788 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
789 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
790 | dh->dccph_cscov, min_cov); | |
791 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
792 | goto discard_and_relse; | |
793 | } | |
794 | ||
3df80d93 ACM |
795 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
796 | goto discard_and_relse; | |
797 | ||
58a5a7b9 | 798 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
799 | |
800 | no_dccp_socket: | |
801 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
802 | goto discard_it; | |
803 | /* | |
804 | * Step 2: | |
8109b02b | 805 | * If no socket ... |
3df80d93 ACM |
806 | * Generate Reset(No Connection) unless P.type == Reset |
807 | * Drop packet and return | |
808 | */ | |
809 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
810 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
811 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 812 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 813 | } |
3df80d93 | 814 | |
d23c7107 | 815 | discard_it: |
3df80d93 ACM |
816 | kfree_skb(skb); |
817 | return 0; | |
818 | ||
819 | discard_and_relse: | |
820 | sock_put(sk); | |
821 | goto discard_it; | |
3df80d93 ACM |
822 | } |
823 | ||
73c9e02c GR |
824 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
825 | int addr_len) | |
826 | { | |
827 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
828 | struct inet_connection_sock *icsk = inet_csk(sk); | |
829 | struct inet_sock *inet = inet_sk(sk); | |
830 | struct ipv6_pinfo *np = inet6_sk(sk); | |
831 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 832 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 833 | struct flowi6 fl6; |
73c9e02c GR |
834 | struct dst_entry *dst; |
835 | int addr_type; | |
836 | int err; | |
837 | ||
838 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
839 | ||
840 | if (addr_len < SIN6_LEN_RFC2133) | |
841 | return -EINVAL; | |
842 | ||
843 | if (usin->sin6_family != AF_INET6) | |
844 | return -EAFNOSUPPORT; | |
845 | ||
4c9483b2 | 846 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
847 | |
848 | if (np->sndflow) { | |
4c9483b2 DM |
849 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
850 | IP6_ECN_flow_init(fl6.flowlabel); | |
851 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 852 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 853 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
854 | if (flowlabel == NULL) |
855 | return -EINVAL; | |
4e3fd7a0 | 856 | usin->sin6_addr = flowlabel->dst; |
73c9e02c GR |
857 | fl6_sock_release(flowlabel); |
858 | } | |
859 | } | |
860 | /* | |
861 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
862 | */ | |
863 | if (ipv6_addr_any(&usin->sin6_addr)) | |
864 | usin->sin6_addr.s6_addr[15] = 1; | |
865 | ||
866 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
867 | ||
868 | if (addr_type & IPV6_ADDR_MULTICAST) | |
869 | return -ENETUNREACH; | |
870 | ||
871 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
872 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
873 | usin->sin6_scope_id) { | |
874 | /* If interface is set while binding, indices | |
875 | * must coincide. | |
876 | */ | |
877 | if (sk->sk_bound_dev_if && | |
878 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
879 | return -EINVAL; | |
880 | ||
881 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
882 | } | |
883 | ||
884 | /* Connect to link-local address requires an interface */ | |
885 | if (!sk->sk_bound_dev_if) | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
4e3fd7a0 | 889 | np->daddr = usin->sin6_addr; |
4c9483b2 | 890 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
891 | |
892 | /* | |
893 | * DCCP over IPv4 | |
894 | */ | |
895 | if (addr_type == IPV6_ADDR_MAPPED) { | |
896 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
897 | struct sockaddr_in sin; | |
898 | ||
899 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
900 | ||
901 | if (__ipv6_only_sock(sk)) | |
902 | return -ENETUNREACH; | |
903 | ||
904 | sin.sin_family = AF_INET; | |
905 | sin.sin_port = usin->sin6_port; | |
906 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
907 | ||
908 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
909 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
910 | ||
911 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
912 | if (err) { | |
913 | icsk->icsk_ext_hdr_len = exthdrlen; | |
914 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
915 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
916 | goto failure; | |
73c9e02c | 917 | } |
c720c7e8 ED |
918 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
919 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr); | |
73c9e02c GR |
920 | |
921 | return err; | |
922 | } | |
923 | ||
924 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
925 | saddr = &np->rcv_saddr; | |
926 | ||
4c9483b2 | 927 | fl6.flowi6_proto = IPPROTO_DCCP; |
4e3fd7a0 AD |
928 | fl6.daddr = np->daddr; |
929 | fl6.saddr = saddr ? *saddr : np->saddr; | |
4c9483b2 | 930 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
931 | fl6.fl6_dport = usin->sin6_port; |
932 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 933 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 934 | |
4c9483b2 | 935 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 936 | |
4c9483b2 | 937 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
938 | if (IS_ERR(dst)) { |
939 | err = PTR_ERR(dst); | |
73c9e02c | 940 | goto failure; |
14e50e57 | 941 | } |
73c9e02c GR |
942 | |
943 | if (saddr == NULL) { | |
4c9483b2 | 944 | saddr = &fl6.saddr; |
4e3fd7a0 | 945 | np->rcv_saddr = *saddr; |
73c9e02c GR |
946 | } |
947 | ||
948 | /* set the source address */ | |
4e3fd7a0 | 949 | np->saddr = *saddr; |
c720c7e8 | 950 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
951 | |
952 | __ip6_dst_store(sk, dst, NULL, NULL); | |
953 | ||
954 | icsk->icsk_ext_hdr_len = 0; | |
955 | if (np->opt != NULL) | |
956 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
957 | np->opt->opt_nflen); | |
958 | ||
c720c7e8 | 959 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
960 | |
961 | dccp_set_state(sk, DCCP_REQUESTING); | |
962 | err = inet6_hash_connect(&dccp_death_row, sk); | |
963 | if (err) | |
964 | goto late_failure; | |
d7f7365f GR |
965 | |
966 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
967 | np->daddr.s6_addr32, | |
c720c7e8 ED |
968 | inet->inet_sport, |
969 | inet->inet_dport); | |
73c9e02c GR |
970 | err = dccp_connect(sk); |
971 | if (err) | |
972 | goto late_failure; | |
973 | ||
974 | return 0; | |
975 | ||
976 | late_failure: | |
977 | dccp_set_state(sk, DCCP_CLOSED); | |
978 | __sk_dst_reset(sk); | |
979 | failure: | |
c720c7e8 | 980 | inet->inet_dport = 0; |
73c9e02c GR |
981 | sk->sk_route_caps = 0; |
982 | return err; | |
983 | } | |
984 | ||
3b401a81 | 985 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
986 | .queue_xmit = inet6_csk_xmit, |
987 | .send_check = dccp_v6_send_check, | |
988 | .rebuild_header = inet6_sk_rebuild_header, | |
989 | .conn_request = dccp_v6_conn_request, | |
990 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
991 | .net_header_len = sizeof(struct ipv6hdr), | |
992 | .setsockopt = ipv6_setsockopt, | |
993 | .getsockopt = ipv6_getsockopt, | |
994 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
995 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 996 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 997 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
998 | .compat_setsockopt = compat_ipv6_setsockopt, |
999 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1000 | #endif |
3df80d93 ACM |
1001 | }; |
1002 | ||
1003 | /* | |
1004 | * DCCP over IPv4 via INET6 API | |
1005 | */ | |
3b401a81 | 1006 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
1007 | .queue_xmit = ip_queue_xmit, |
1008 | .send_check = dccp_v4_send_check, | |
1009 | .rebuild_header = inet_sk_rebuild_header, | |
1010 | .conn_request = dccp_v6_conn_request, | |
1011 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
1012 | .net_header_len = sizeof(struct iphdr), | |
1013 | .setsockopt = ipv6_setsockopt, | |
1014 | .getsockopt = ipv6_getsockopt, | |
1015 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1016 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
c3a924e1 | 1017 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1018 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1019 | .compat_setsockopt = compat_ipv6_setsockopt, |
1020 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1021 | #endif |
3df80d93 ACM |
1022 | }; |
1023 | ||
1024 | /* NOTE: A lot of things set to zero explicitly by call to | |
1025 | * sk_alloc() so need not be done here. | |
1026 | */ | |
1027 | static int dccp_v6_init_sock(struct sock *sk) | |
1028 | { | |
72478873 ACM |
1029 | static __u8 dccp_v6_ctl_sock_initialized; |
1030 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1031 | |
72478873 ACM |
1032 | if (err == 0) { |
1033 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1034 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1035 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1036 | } |
3df80d93 ACM |
1037 | |
1038 | return err; | |
1039 | } | |
1040 | ||
7d06b2e0 | 1041 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1042 | { |
3e0fadc5 | 1043 | dccp_destroy_sock(sk); |
7d06b2e0 | 1044 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1045 | } |
1046 | ||
73c9e02c GR |
1047 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1048 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1049 | }; | |
1050 | ||
3df80d93 | 1051 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1052 | .name = "DCCPv6", |
1053 | .owner = THIS_MODULE, | |
1054 | .close = dccp_close, | |
1055 | .connect = dccp_v6_connect, | |
1056 | .disconnect = dccp_disconnect, | |
1057 | .ioctl = dccp_ioctl, | |
1058 | .init = dccp_v6_init_sock, | |
1059 | .setsockopt = dccp_setsockopt, | |
1060 | .getsockopt = dccp_getsockopt, | |
1061 | .sendmsg = dccp_sendmsg, | |
1062 | .recvmsg = dccp_recvmsg, | |
1063 | .backlog_rcv = dccp_v6_do_rcv, | |
1064 | .hash = dccp_v6_hash, | |
ab1e0a13 | 1065 | .unhash = inet_unhash, |
543d9cfe | 1066 | .accept = inet_csk_accept, |
ab1e0a13 | 1067 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1068 | .shutdown = dccp_shutdown, |
1069 | .destroy = dccp_v6_destroy_sock, | |
1070 | .orphan_count = &dccp_orphan_count, | |
1071 | .max_header = MAX_DCCP_HEADER, | |
1072 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1073 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1074 | .rsk_prot = &dccp6_request_sock_ops, |
1075 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1076 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1077 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1078 | .compat_setsockopt = compat_dccp_setsockopt, |
1079 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1080 | #endif |
3df80d93 ACM |
1081 | }; |
1082 | ||
41135cc8 | 1083 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1084 | .handler = dccp_v6_rcv, |
1085 | .err_handler = dccp_v6_err, | |
1086 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1087 | }; |
1088 | ||
5708e868 | 1089 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1090 | .family = PF_INET6, |
1091 | .owner = THIS_MODULE, | |
1092 | .release = inet6_release, | |
1093 | .bind = inet6_bind, | |
1094 | .connect = inet_stream_connect, | |
1095 | .socketpair = sock_no_socketpair, | |
1096 | .accept = inet_accept, | |
1097 | .getname = inet6_getname, | |
1098 | .poll = dccp_poll, | |
1099 | .ioctl = inet6_ioctl, | |
1100 | .listen = inet_dccp_listen, | |
1101 | .shutdown = inet_shutdown, | |
1102 | .setsockopt = sock_common_setsockopt, | |
1103 | .getsockopt = sock_common_getsockopt, | |
1104 | .sendmsg = inet_sendmsg, | |
1105 | .recvmsg = sock_common_recvmsg, | |
1106 | .mmap = sock_no_mmap, | |
1107 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1108 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1109 | .compat_setsockopt = compat_sock_common_setsockopt, |
1110 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1111 | #endif |
3df80d93 ACM |
1112 | }; |
1113 | ||
1114 | static struct inet_protosw dccp_v6_protosw = { | |
1115 | .type = SOCK_DCCP, | |
1116 | .protocol = IPPROTO_DCCP, | |
1117 | .prot = &dccp_v6_prot, | |
1118 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1119 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1120 | }; |
1121 | ||
2c8c1e72 | 1122 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1123 | { |
d14a0ebd GR |
1124 | if (dccp_hashinfo.bhash == NULL) |
1125 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1126 | |
d14a0ebd GR |
1127 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1128 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1129 | } |
1130 | ||
2c8c1e72 | 1131 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1132 | { |
334527d3 | 1133 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1134 | } |
1135 | ||
1136 | static struct pernet_operations dccp_v6_ops = { | |
1137 | .init = dccp_v6_init_net, | |
1138 | .exit = dccp_v6_exit_net, | |
1139 | }; | |
1140 | ||
3df80d93 ACM |
1141 | static int __init dccp_v6_init(void) |
1142 | { | |
1143 | int err = proto_register(&dccp_v6_prot, 1); | |
1144 | ||
1145 | if (err != 0) | |
1146 | goto out; | |
1147 | ||
1148 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1149 | if (err != 0) | |
1150 | goto out_unregister_proto; | |
1151 | ||
1152 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1153 | |
8231bd27 PE |
1154 | err = register_pernet_subsys(&dccp_v6_ops); |
1155 | if (err != 0) | |
1156 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1157 | out: |
1158 | return err; | |
8231bd27 PE |
1159 | |
1160 | out_destroy_ctl_sock: | |
72478873 ACM |
1161 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1162 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1163 | out_unregister_proto: |
1164 | proto_unregister(&dccp_v6_prot); | |
1165 | goto out; | |
1166 | } | |
1167 | ||
1168 | static void __exit dccp_v6_exit(void) | |
1169 | { | |
8231bd27 | 1170 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1171 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1172 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1173 | proto_unregister(&dccp_v6_prot); | |
1174 | } | |
1175 | ||
1176 | module_init(dccp_v6_init); | |
1177 | module_exit(dccp_v6_exit); | |
1178 | ||
1179 | /* | |
1180 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1181 | * values directly, Also cover the case where the protocol is not specified, | |
1182 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1183 | */ | |
7131c6c7 JD |
1184 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1185 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1186 | MODULE_LICENSE("GPL"); |
1187 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1188 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |