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 | |
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 | ||
52036a43 ED |
88 | sk = __inet6_lookup_established(net, &dccp_hashinfo, |
89 | &hdr->daddr, dh->dccph_dport, | |
90 | &hdr->saddr, ntohs(dh->dccph_sport), | |
91 | inet6_iif(skb)); | |
3df80d93 | 92 | |
52036a43 | 93 | if (!sk) { |
e41b5368 DL |
94 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
95 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
96 | return; |
97 | } | |
98 | ||
99 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 100 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
101 | return; |
102 | } | |
52036a43 ED |
103 | seq = dccp_hdr_seq(dh); |
104 | if (sk->sk_state == DCCP_NEW_SYN_RECV) | |
105 | return dccp_req_err(sk, seq); | |
3df80d93 ACM |
106 | |
107 | bh_lock_sock(sk); | |
108 | if (sock_owned_by_user(sk)) | |
de0744af | 109 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
110 | |
111 | if (sk->sk_state == DCCP_CLOSED) | |
112 | goto out; | |
113 | ||
e0bcfb0c | 114 | dp = dccp_sk(sk); |
e0bcfb0c WY |
115 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
116 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
117 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); | |
118 | goto out; | |
119 | } | |
120 | ||
3df80d93 ACM |
121 | np = inet6_sk(sk); |
122 | ||
ec18d9a2 DM |
123 | if (type == NDISC_REDIRECT) { |
124 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
125 | ||
1ed5c48f | 126 | if (dst) |
6700c270 | 127 | dst->ops->redirect(dst, sk, skb); |
bd784a14 | 128 | goto out; |
ec18d9a2 DM |
129 | } |
130 | ||
3df80d93 | 131 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
132 | struct dst_entry *dst = NULL; |
133 | ||
93b36cf3 HFS |
134 | if (!ip6_sk_accept_pmtu(sk)) |
135 | goto out; | |
136 | ||
3df80d93 ACM |
137 | if (sock_owned_by_user(sk)) |
138 | goto out; | |
139 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
140 | goto out; | |
141 | ||
35ad9b9c DM |
142 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
143 | if (!dst) | |
144 | goto out; | |
145 | ||
146 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 147 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
148 | goto out; |
149 | } | |
150 | ||
151 | icmpv6_err_convert(type, code, &err); | |
152 | ||
3df80d93 ACM |
153 | /* Might be for an request_sock */ |
154 | switch (sk->sk_state) { | |
3df80d93 ACM |
155 | case DCCP_REQUESTING: |
156 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 157 | It can, it SYNs are crossed. --ANK */ |
3df80d93 ACM |
158 | if (!sock_owned_by_user(sk)) { |
159 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
160 | sk->sk_err = err; | |
161 | /* | |
162 | * Wake people up to see the error | |
163 | * (see connect in sock.c) | |
164 | */ | |
165 | sk->sk_error_report(sk); | |
3df80d93 ACM |
166 | dccp_done(sk); |
167 | } else | |
168 | sk->sk_err_soft = err; | |
169 | goto out; | |
170 | } | |
171 | ||
172 | if (!sock_owned_by_user(sk) && np->recverr) { | |
173 | sk->sk_err = err; | |
174 | sk->sk_error_report(sk); | |
175 | } else | |
176 | sk->sk_err_soft = err; | |
177 | ||
178 | out: | |
179 | bh_unlock_sock(sk); | |
180 | sock_put(sk); | |
181 | } | |
182 | ||
183 | ||
1a2c6181 | 184 | static int dccp_v6_send_response(struct sock *sk, struct request_sock *req) |
3df80d93 | 185 | { |
634fb979 | 186 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
187 | struct ipv6_pinfo *np = inet6_sk(sk); |
188 | struct sk_buff *skb; | |
20c59de2 | 189 | struct in6_addr *final_p, final; |
4c9483b2 | 190 | struct flowi6 fl6; |
3df80d93 | 191 | int err = -1; |
fd80eb94 | 192 | struct dst_entry *dst; |
3df80d93 | 193 | |
4c9483b2 DM |
194 | memset(&fl6, 0, sizeof(fl6)); |
195 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
196 | fl6.daddr = ireq->ir_v6_rmt_addr; |
197 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 198 | fl6.flowlabel = 0; |
634fb979 ED |
199 | fl6.flowi6_oif = ireq->ir_iif; |
200 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 201 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 202 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 203 | |
3df80d93 | 204 | |
0979e465 | 205 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
3df80d93 | 206 | |
0e0d44ab | 207 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
208 | if (IS_ERR(dst)) { |
209 | err = PTR_ERR(dst); | |
210 | dst = NULL; | |
fd80eb94 | 211 | goto done; |
68d0c6d3 | 212 | } |
3df80d93 ACM |
213 | |
214 | skb = dccp_make_response(sk, dst, req); | |
215 | if (skb != NULL) { | |
216 | struct dccp_hdr *dh = dccp_hdr(skb); | |
45329e71 | 217 | |
6f4e5fff | 218 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
219 | &ireq->ir_v6_loc_addr, |
220 | &ireq->ir_v6_rmt_addr); | |
221 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
0979e465 | 222 | err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
b9df3cb8 | 223 | err = net_xmit_eval(err); |
3df80d93 ACM |
224 | } |
225 | ||
226 | done: | |
0cbd7825 | 227 | dst_release(dst); |
3df80d93 ACM |
228 | return err; |
229 | } | |
230 | ||
231 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
232 | { | |
d99a7bd2 | 233 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
634fb979 | 234 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
235 | } |
236 | ||
cfb6eeb4 | 237 | static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 238 | { |
b71d1d42 | 239 | const struct ipv6hdr *rxip6h; |
3df80d93 | 240 | struct sk_buff *skb; |
4c9483b2 | 241 | struct flowi6 fl6; |
adf30907 | 242 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 243 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 244 | struct dst_entry *dst; |
3df80d93 | 245 | |
e356d37a | 246 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
247 | return; |
248 | ||
249 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 250 | return; |
3df80d93 | 251 | |
02047741 | 252 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 253 | if (skb == NULL) |
8109b02b | 254 | return; |
3df80d93 | 255 | |
0660e03f | 256 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
257 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
258 | &rxip6h->daddr); | |
6f4e5fff | 259 | |
4c9483b2 | 260 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
261 | fl6.daddr = rxip6h->saddr; |
262 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 263 | |
4c9483b2 DM |
264 | fl6.flowi6_proto = IPPROTO_DCCP; |
265 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
266 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
267 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 268 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
269 | |
270 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 271 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
272 | if (!IS_ERR(dst)) { |
273 | skb_dst_set(skb, dst); | |
b903d324 | 274 | ip6_xmit(ctl_sk, skb, &fl6, NULL, 0); |
68d0c6d3 DM |
275 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
276 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
277 | return; | |
3df80d93 ACM |
278 | } |
279 | ||
280 | kfree_skb(skb); | |
281 | } | |
282 | ||
73c9e02c GR |
283 | static struct request_sock_ops dccp6_request_sock_ops = { |
284 | .family = AF_INET6, | |
285 | .obj_size = sizeof(struct dccp6_request_sock), | |
286 | .rtx_syn_ack = dccp_v6_send_response, | |
287 | .send_ack = dccp_reqsk_send_ack, | |
288 | .destructor = dccp_v6_reqsk_destructor, | |
289 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 290 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
291 | }; |
292 | ||
3df80d93 ACM |
293 | static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
294 | { | |
295 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
0660e03f | 296 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
52452c54 | 297 | struct request_sock *req; |
3df80d93 | 298 | struct sock *nsk; |
52452c54 ED |
299 | |
300 | req = inet6_csk_search_req(sk, dh->dccph_sport, &iph->saddr, | |
301 | &iph->daddr, inet6_iif(skb)); | |
fa76ce73 ED |
302 | if (req) { |
303 | nsk = dccp_check_req(sk, skb, req); | |
304 | reqsk_put(req); | |
305 | return nsk; | |
306 | } | |
671a1c74 | 307 | nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo, |
3df80d93 ACM |
308 | &iph->saddr, dh->dccph_sport, |
309 | &iph->daddr, ntohs(dh->dccph_dport), | |
310 | inet6_iif(skb)); | |
3df80d93 ACM |
311 | if (nsk != NULL) { |
312 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
313 | bh_lock_sock(nsk); | |
314 | return nsk; | |
315 | } | |
9469c7b4 | 316 | inet_twsk_put(inet_twsk(nsk)); |
3df80d93 ACM |
317 | return NULL; |
318 | } | |
319 | ||
320 | return sk; | |
321 | } | |
322 | ||
323 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
324 | { | |
3df80d93 ACM |
325 | struct request_sock *req; |
326 | struct dccp_request_sock *dreq; | |
634fb979 | 327 | struct inet_request_sock *ireq; |
3df80d93 | 328 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 329 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 330 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
331 | |
332 | if (skb->protocol == htons(ETH_P_IP)) | |
333 | return dccp_v4_conn_request(sk, skb); | |
334 | ||
335 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 336 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
337 | |
338 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 339 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 340 | goto drop; |
8109b02b | 341 | } |
3df80d93 | 342 | /* |
45329e71 | 343 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 344 | */ |
4a5409a5 | 345 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 346 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 347 | goto drop; |
3df80d93 ACM |
348 | |
349 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
350 | goto drop; | |
351 | ||
407640de | 352 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk); |
3df80d93 ACM |
353 | if (req == NULL) |
354 | goto drop; | |
355 | ||
ac75773c GR |
356 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
357 | goto drop_and_free; | |
3df80d93 | 358 | |
8b819412 GR |
359 | dreq = dccp_rsk(req); |
360 | if (dccp_parse_options(sk, dreq, skb)) | |
361 | goto drop_and_free; | |
362 | ||
4237c75c VY |
363 | if (security_inet_conn_request(sk, skb, req)) |
364 | goto drop_and_free; | |
365 | ||
634fb979 ED |
366 | ireq = inet_rsk(req); |
367 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
368 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 369 | ireq->ireq_family = AF_INET6; |
3df80d93 | 370 | |
a224772d | 371 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
372 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
373 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
374 | atomic_inc(&skb->users); | |
634fb979 | 375 | ireq->pktopts = skb; |
3df80d93 | 376 | } |
634fb979 | 377 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
378 | |
379 | /* So that link locals have meaning */ | |
380 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
381 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
382 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 383 | |
45329e71 | 384 | /* |
3df80d93 ACM |
385 | * Step 3: Process LISTEN state |
386 | * | |
d83ca5ac | 387 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 388 | * |
f541fb7e | 389 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 390 | */ |
3df80d93 | 391 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 392 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 393 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 394 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
395 | dreq->dreq_service = service; |
396 | ||
1a2c6181 | 397 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
398 | goto drop_and_free; |
399 | ||
400 | inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
401 | return 0; | |
402 | ||
403 | drop_and_free: | |
404 | reqsk_free(req); | |
405 | drop: | |
406 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
407 | return -1; |
408 | } | |
409 | ||
410 | static struct sock *dccp_v6_request_recv_sock(struct sock *sk, | |
411 | struct sk_buff *skb, | |
412 | struct request_sock *req, | |
413 | struct dst_entry *dst) | |
414 | { | |
634fb979 | 415 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
416 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
417 | struct inet_sock *newinet; | |
3df80d93 ACM |
418 | struct dccp6_sock *newdp6; |
419 | struct sock *newsk; | |
3df80d93 ACM |
420 | |
421 | if (skb->protocol == htons(ETH_P_IP)) { | |
422 | /* | |
423 | * v6 mapped | |
424 | */ | |
3df80d93 | 425 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 426 | if (newsk == NULL) |
3df80d93 ACM |
427 | return NULL; |
428 | ||
429 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
430 | newinet = inet_sk(newsk); |
431 | newinet->pinet6 = &newdp6->inet6; | |
432 | newnp = inet6_sk(newsk); | |
433 | ||
434 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
435 | ||
d1e559d0 | 436 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
437 | |
438 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
439 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
440 | newnp->pktoptions = NULL; | |
441 | newnp->opt = NULL; | |
442 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 443 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
444 | |
445 | /* | |
446 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
447 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
448 | * that function for the gory details. -acme | |
449 | */ | |
450 | ||
451 | /* It is tricky place. Until this moment IPv4 tcp | |
452 | worked with IPv6 icsk.icsk_af_ops. | |
453 | Sync it now. | |
454 | */ | |
d83d8461 | 455 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
456 | |
457 | return newsk; | |
458 | } | |
459 | ||
3df80d93 ACM |
460 | |
461 | if (sk_acceptq_is_full(sk)) | |
462 | goto out_overflow; | |
463 | ||
3df80d93 | 464 | if (dst == NULL) { |
20c59de2 | 465 | struct in6_addr *final_p, final; |
4c9483b2 DM |
466 | struct flowi6 fl6; |
467 | ||
468 | memset(&fl6, 0, sizeof(fl6)); | |
469 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 | 470 | fl6.daddr = ireq->ir_v6_rmt_addr; |
0979e465 | 471 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
634fb979 | 472 | fl6.saddr = ireq->ir_v6_loc_addr; |
4c9483b2 | 473 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
634fb979 | 474 | fl6.fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 475 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 DM |
476 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
477 | ||
0e0d44ab | 478 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 | 479 | if (IS_ERR(dst)) |
3df80d93 | 480 | goto out; |
45329e71 | 481 | } |
3df80d93 ACM |
482 | |
483 | newsk = dccp_create_openreq_child(sk, req, skb); | |
484 | if (newsk == NULL) | |
093d2823 | 485 | goto out_nonewsk; |
3df80d93 ACM |
486 | |
487 | /* | |
488 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
489 | * count here, dccp_create_openreq_child now does this for us, see the | |
490 | * comment in that function for the gory details. -acme | |
491 | */ | |
492 | ||
8e1ef0a9 | 493 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
494 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
495 | NETIF_F_TSO); | |
3df80d93 ACM |
496 | newdp6 = (struct dccp6_sock *)newsk; |
497 | newinet = inet_sk(newsk); | |
498 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
499 | newnp = inet6_sk(newsk); |
500 | ||
501 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
502 | ||
634fb979 ED |
503 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
504 | newnp->saddr = ireq->ir_v6_loc_addr; | |
505 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
506 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 507 | |
45329e71 | 508 | /* Now IPv6 options... |
3df80d93 ACM |
509 | |
510 | First: no IPv4 options. | |
511 | */ | |
f6d8bd05 | 512 | newinet->inet_opt = NULL; |
3df80d93 ACM |
513 | |
514 | /* Clone RX bits */ | |
515 | newnp->rxopt.all = np->rxopt.all; | |
516 | ||
517 | /* Clone pktoptions received with SYN */ | |
518 | newnp->pktoptions = NULL; | |
634fb979 ED |
519 | if (ireq->pktopts != NULL) { |
520 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
521 | consume_skb(ireq->pktopts); | |
522 | ireq->pktopts = NULL; | |
3df80d93 ACM |
523 | if (newnp->pktoptions) |
524 | skb_set_owner_r(newnp->pktoptions, newsk); | |
525 | } | |
526 | newnp->opt = NULL; | |
527 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 528 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 529 | |
45329e71 ACM |
530 | /* |
531 | * Clone native IPv6 options from listening socket (if any) | |
532 | * | |
533 | * Yes, keeping reference count would be much more clever, but we make | |
534 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 535 | */ |
0979e465 RL |
536 | if (np->opt != NULL) |
537 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 538 | |
d83d8461 | 539 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 540 | if (newnp->opt != NULL) |
d83d8461 ACM |
541 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
542 | newnp->opt->opt_flen); | |
3df80d93 ACM |
543 | |
544 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
545 | ||
c720c7e8 ED |
546 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
547 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 548 | |
093d2823 | 549 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
550 | inet_csk_prepare_forced_close(newsk); |
551 | dccp_done(newsk); | |
093d2823 BS |
552 | goto out; |
553 | } | |
77a6a471 | 554 | __inet_hash(newsk, NULL); |
3df80d93 ACM |
555 | |
556 | return newsk; | |
557 | ||
558 | out_overflow: | |
de0744af | 559 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
560 | out_nonewsk: |
561 | dst_release(dst); | |
3df80d93 | 562 | out: |
de0744af | 563 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
564 | return NULL; |
565 | } | |
566 | ||
567 | /* The socket must have it's spinlock held when we get | |
568 | * here. | |
569 | * | |
570 | * We have a potential double-lock case here, so even when | |
571 | * doing backlog processing we use the BH locking scheme. | |
572 | * This is because we cannot sleep with the original spinlock | |
573 | * held. | |
574 | */ | |
575 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
576 | { | |
577 | struct ipv6_pinfo *np = inet6_sk(sk); | |
578 | struct sk_buff *opt_skb = NULL; | |
579 | ||
580 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
581 | goes to IPv4 receive handler and backlogged. | |
582 | From backlog it always goes here. Kerboom... | |
583 | Fortunately, dccp_rcv_established and rcv_established | |
584 | handle them correctly, but it is not case with | |
585 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
586 | */ | |
587 | ||
588 | if (skb->protocol == htons(ETH_P_IP)) | |
589 | return dccp_v4_do_rcv(sk, skb); | |
590 | ||
fda9ef5d | 591 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
592 | goto discard; |
593 | ||
594 | /* | |
45329e71 ACM |
595 | * socket locking is here for SMP purposes as backlog rcv is currently |
596 | * called with bh processing disabled. | |
3df80d93 ACM |
597 | */ |
598 | ||
599 | /* Do Stevens' IPV6_PKTOPTIONS. | |
600 | ||
601 | Yes, guys, it is the only place in our code, where we | |
602 | may make it not affecting IPv4. | |
603 | The rest of code is protocol independent, | |
604 | and I do not like idea to uglify IPv4. | |
605 | ||
606 | Actually, all the idea behind IPV6_PKTOPTIONS | |
607 | looks not very well thought. For now we latch | |
608 | options, received in the last packet, enqueued | |
609 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 610 | --ANK (980728) |
3df80d93 ACM |
611 | */ |
612 | if (np->rxopt.all) | |
89e7e577 GR |
613 | /* |
614 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
615 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
616 | */ | |
3df80d93 ACM |
617 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
618 | ||
619 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
620 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
621 | goto reset; | |
fd169f15 | 622 | if (opt_skb) { |
89e7e577 | 623 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
624 | __kfree_skb(opt_skb); |
625 | } | |
3df80d93 ACM |
626 | return 0; |
627 | } | |
628 | ||
d83ca5ac GR |
629 | /* |
630 | * Step 3: Process LISTEN state | |
631 | * If S.state == LISTEN, | |
632 | * If P.type == Request or P contains a valid Init Cookie option, | |
633 | * (* Must scan the packet's options to check for Init | |
634 | * Cookies. Only Init Cookies are processed here, | |
635 | * however; other options are processed in Step 8. This | |
636 | * scan need only be performed if the endpoint uses Init | |
637 | * Cookies *) | |
638 | * (* Generate a new socket and switch to that socket *) | |
639 | * Set S := new socket for this port pair | |
640 | * S.state = RESPOND | |
641 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
642 | * Initialize S.GAR := S.ISS | |
643 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
644 | * Continue with S.state == RESPOND | |
645 | * (* A Response packet will be generated in Step 11 *) | |
646 | * Otherwise, | |
647 | * Generate Reset(No Connection) unless P.type == Reset | |
648 | * Drop packet and return | |
649 | * | |
650 | * NOTE: the check for the packet types is done in | |
651 | * dccp_rcv_state_process | |
652 | */ | |
45329e71 | 653 | if (sk->sk_state == DCCP_LISTEN) { |
3df80d93 | 654 | struct sock *nsk = dccp_v6_hnd_req(sk, skb); |
3df80d93 | 655 | |
45329e71 ACM |
656 | if (nsk == NULL) |
657 | goto discard; | |
3df80d93 ACM |
658 | /* |
659 | * Queue it on the new socket if the new socket is active, | |
660 | * otherwise we just shortcircuit this and continue with | |
661 | * the new socket.. | |
662 | */ | |
8109b02b | 663 | if (nsk != sk) { |
3df80d93 ACM |
664 | if (dccp_child_process(sk, nsk, skb)) |
665 | goto reset; | |
45329e71 | 666 | if (opt_skb != NULL) |
3df80d93 ACM |
667 | __kfree_skb(opt_skb); |
668 | return 0; | |
669 | } | |
670 | } | |
671 | ||
672 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
673 | goto reset; | |
fd169f15 | 674 | if (opt_skb) { |
89e7e577 | 675 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
676 | __kfree_skb(opt_skb); |
677 | } | |
3df80d93 ACM |
678 | return 0; |
679 | ||
680 | reset: | |
cfb6eeb4 | 681 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 682 | discard: |
45329e71 | 683 | if (opt_skb != NULL) |
3df80d93 ACM |
684 | __kfree_skb(opt_skb); |
685 | kfree_skb(skb); | |
686 | return 0; | |
687 | } | |
688 | ||
e5bbef20 | 689 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
690 | { |
691 | const struct dccp_hdr *dh; | |
3df80d93 | 692 | struct sock *sk; |
6f4e5fff | 693 | int min_cov; |
3df80d93 | 694 | |
6f4e5fff | 695 | /* Step 1: Check header basics */ |
3df80d93 ACM |
696 | |
697 | if (dccp_invalid_packet(skb)) | |
698 | goto discard_it; | |
699 | ||
6f4e5fff | 700 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
701 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
702 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 703 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
704 | goto discard_it; |
705 | } | |
706 | ||
3df80d93 ACM |
707 | dh = dccp_hdr(skb); |
708 | ||
fde20105 | 709 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
710 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
711 | ||
712 | if (dccp_packet_without_ack(skb)) | |
713 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
714 | else | |
715 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
716 | ||
717 | /* Step 2: | |
8109b02b | 718 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 | 719 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
870c3151 ED |
720 | dh->dccph_sport, dh->dccph_dport, |
721 | inet6_iif(skb)); | |
45329e71 | 722 | /* |
3df80d93 | 723 | * Step 2: |
8109b02b | 724 | * If no socket ... |
3df80d93 | 725 | */ |
d23c7107 GR |
726 | if (sk == NULL) { |
727 | dccp_pr_debug("failed to look up flow ID in table and " | |
728 | "get corresponding socket\n"); | |
3df80d93 | 729 | goto no_dccp_socket; |
d23c7107 | 730 | } |
3df80d93 | 731 | |
45329e71 | 732 | /* |
3df80d93 | 733 | * Step 2: |
8109b02b | 734 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
735 | * Generate Reset(No Connection) unless P.type == Reset |
736 | * Drop packet and return | |
737 | */ | |
d23c7107 GR |
738 | if (sk->sk_state == DCCP_TIME_WAIT) { |
739 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
740 | inet_twsk_put(inet_twsk(sk)); | |
741 | goto no_dccp_socket; | |
742 | } | |
3df80d93 | 743 | |
6f4e5fff GR |
744 | /* |
745 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
746 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
747 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
748 | */ |
749 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
750 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
751 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
752 | dh->dccph_cscov, min_cov); | |
753 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
754 | goto discard_and_relse; | |
755 | } | |
756 | ||
3df80d93 ACM |
757 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
758 | goto discard_and_relse; | |
759 | ||
58a5a7b9 | 760 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
761 | |
762 | no_dccp_socket: | |
763 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
764 | goto discard_it; | |
765 | /* | |
766 | * Step 2: | |
8109b02b | 767 | * If no socket ... |
3df80d93 ACM |
768 | * Generate Reset(No Connection) unless P.type == Reset |
769 | * Drop packet and return | |
770 | */ | |
771 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
772 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
773 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 774 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 775 | } |
3df80d93 | 776 | |
d23c7107 | 777 | discard_it: |
3df80d93 ACM |
778 | kfree_skb(skb); |
779 | return 0; | |
780 | ||
781 | discard_and_relse: | |
782 | sock_put(sk); | |
783 | goto discard_it; | |
3df80d93 ACM |
784 | } |
785 | ||
73c9e02c GR |
786 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
787 | int addr_len) | |
788 | { | |
789 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
790 | struct inet_connection_sock *icsk = inet_csk(sk); | |
791 | struct inet_sock *inet = inet_sk(sk); | |
792 | struct ipv6_pinfo *np = inet6_sk(sk); | |
793 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 794 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 795 | struct flowi6 fl6; |
73c9e02c GR |
796 | struct dst_entry *dst; |
797 | int addr_type; | |
798 | int err; | |
799 | ||
800 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
801 | ||
802 | if (addr_len < SIN6_LEN_RFC2133) | |
803 | return -EINVAL; | |
804 | ||
805 | if (usin->sin6_family != AF_INET6) | |
806 | return -EAFNOSUPPORT; | |
807 | ||
4c9483b2 | 808 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
809 | |
810 | if (np->sndflow) { | |
4c9483b2 DM |
811 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
812 | IP6_ECN_flow_init(fl6.flowlabel); | |
813 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 814 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 815 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
816 | if (flowlabel == NULL) |
817 | return -EINVAL; | |
73c9e02c GR |
818 | fl6_sock_release(flowlabel); |
819 | } | |
820 | } | |
821 | /* | |
822 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
823 | */ | |
824 | if (ipv6_addr_any(&usin->sin6_addr)) | |
825 | usin->sin6_addr.s6_addr[15] = 1; | |
826 | ||
827 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
828 | ||
829 | if (addr_type & IPV6_ADDR_MULTICAST) | |
830 | return -ENETUNREACH; | |
831 | ||
832 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
833 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
834 | usin->sin6_scope_id) { | |
835 | /* If interface is set while binding, indices | |
836 | * must coincide. | |
837 | */ | |
838 | if (sk->sk_bound_dev_if && | |
839 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
840 | return -EINVAL; | |
841 | ||
842 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
843 | } | |
844 | ||
845 | /* Connect to link-local address requires an interface */ | |
846 | if (!sk->sk_bound_dev_if) | |
847 | return -EINVAL; | |
848 | } | |
849 | ||
efe4208f | 850 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 851 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
852 | |
853 | /* | |
854 | * DCCP over IPv4 | |
855 | */ | |
856 | if (addr_type == IPV6_ADDR_MAPPED) { | |
857 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
858 | struct sockaddr_in sin; | |
859 | ||
860 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
861 | ||
862 | if (__ipv6_only_sock(sk)) | |
863 | return -ENETUNREACH; | |
864 | ||
865 | sin.sin_family = AF_INET; | |
866 | sin.sin_port = usin->sin6_port; | |
867 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
868 | ||
869 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
870 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
871 | ||
872 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
873 | if (err) { | |
874 | icsk->icsk_ext_hdr_len = exthdrlen; | |
875 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
876 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
877 | goto failure; | |
73c9e02c | 878 | } |
d1e559d0 | 879 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
880 | return err; |
881 | } | |
882 | ||
efe4208f ED |
883 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
884 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 885 | |
4c9483b2 | 886 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 887 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 888 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 889 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
890 | fl6.fl6_dport = usin->sin6_port; |
891 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 892 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 893 | |
4c9483b2 | 894 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 895 | |
0e0d44ab | 896 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
897 | if (IS_ERR(dst)) { |
898 | err = PTR_ERR(dst); | |
73c9e02c | 899 | goto failure; |
14e50e57 | 900 | } |
73c9e02c GR |
901 | |
902 | if (saddr == NULL) { | |
4c9483b2 | 903 | saddr = &fl6.saddr; |
efe4208f | 904 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
905 | } |
906 | ||
907 | /* set the source address */ | |
4e3fd7a0 | 908 | np->saddr = *saddr; |
c720c7e8 | 909 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
910 | |
911 | __ip6_dst_store(sk, dst, NULL, NULL); | |
912 | ||
913 | icsk->icsk_ext_hdr_len = 0; | |
914 | if (np->opt != NULL) | |
915 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
916 | np->opt->opt_nflen); | |
917 | ||
c720c7e8 | 918 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
919 | |
920 | dccp_set_state(sk, DCCP_REQUESTING); | |
921 | err = inet6_hash_connect(&dccp_death_row, sk); | |
922 | if (err) | |
923 | goto late_failure; | |
d7f7365f GR |
924 | |
925 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 926 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
927 | inet->inet_sport, |
928 | inet->inet_dport); | |
73c9e02c GR |
929 | err = dccp_connect(sk); |
930 | if (err) | |
931 | goto late_failure; | |
932 | ||
933 | return 0; | |
934 | ||
935 | late_failure: | |
936 | dccp_set_state(sk, DCCP_CLOSED); | |
937 | __sk_dst_reset(sk); | |
938 | failure: | |
c720c7e8 | 939 | inet->inet_dport = 0; |
73c9e02c GR |
940 | sk->sk_route_caps = 0; |
941 | return err; | |
942 | } | |
943 | ||
3b401a81 | 944 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
945 | .queue_xmit = inet6_csk_xmit, |
946 | .send_check = dccp_v6_send_check, | |
947 | .rebuild_header = inet6_sk_rebuild_header, | |
948 | .conn_request = dccp_v6_conn_request, | |
949 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
950 | .net_header_len = sizeof(struct ipv6hdr), | |
951 | .setsockopt = ipv6_setsockopt, | |
952 | .getsockopt = ipv6_getsockopt, | |
953 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
954 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 955 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 956 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
957 | .compat_setsockopt = compat_ipv6_setsockopt, |
958 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 959 | #endif |
3df80d93 ACM |
960 | }; |
961 | ||
962 | /* | |
963 | * DCCP over IPv4 via INET6 API | |
964 | */ | |
3b401a81 | 965 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
966 | .queue_xmit = ip_queue_xmit, |
967 | .send_check = dccp_v4_send_check, | |
968 | .rebuild_header = inet_sk_rebuild_header, | |
969 | .conn_request = dccp_v6_conn_request, | |
970 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
971 | .net_header_len = sizeof(struct iphdr), | |
972 | .setsockopt = ipv6_setsockopt, | |
973 | .getsockopt = ipv6_getsockopt, | |
974 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
975 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 976 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
977 | .compat_setsockopt = compat_ipv6_setsockopt, |
978 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 979 | #endif |
3df80d93 ACM |
980 | }; |
981 | ||
982 | /* NOTE: A lot of things set to zero explicitly by call to | |
983 | * sk_alloc() so need not be done here. | |
984 | */ | |
985 | static int dccp_v6_init_sock(struct sock *sk) | |
986 | { | |
72478873 ACM |
987 | static __u8 dccp_v6_ctl_sock_initialized; |
988 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 989 | |
72478873 ACM |
990 | if (err == 0) { |
991 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
992 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 993 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 994 | } |
3df80d93 ACM |
995 | |
996 | return err; | |
997 | } | |
998 | ||
7d06b2e0 | 999 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1000 | { |
3e0fadc5 | 1001 | dccp_destroy_sock(sk); |
7d06b2e0 | 1002 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1003 | } |
1004 | ||
73c9e02c GR |
1005 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1006 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1007 | }; | |
1008 | ||
3df80d93 | 1009 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1010 | .name = "DCCPv6", |
1011 | .owner = THIS_MODULE, | |
1012 | .close = dccp_close, | |
1013 | .connect = dccp_v6_connect, | |
1014 | .disconnect = dccp_disconnect, | |
1015 | .ioctl = dccp_ioctl, | |
1016 | .init = dccp_v6_init_sock, | |
1017 | .setsockopt = dccp_setsockopt, | |
1018 | .getsockopt = dccp_getsockopt, | |
1019 | .sendmsg = dccp_sendmsg, | |
1020 | .recvmsg = dccp_recvmsg, | |
1021 | .backlog_rcv = dccp_v6_do_rcv, | |
77a6a471 | 1022 | .hash = inet_hash, |
ab1e0a13 | 1023 | .unhash = inet_unhash, |
543d9cfe | 1024 | .accept = inet_csk_accept, |
ab1e0a13 | 1025 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1026 | .shutdown = dccp_shutdown, |
1027 | .destroy = dccp_v6_destroy_sock, | |
1028 | .orphan_count = &dccp_orphan_count, | |
1029 | .max_header = MAX_DCCP_HEADER, | |
1030 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 1031 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
1032 | .rsk_prot = &dccp6_request_sock_ops, |
1033 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1034 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1035 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1036 | .compat_setsockopt = compat_dccp_setsockopt, |
1037 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1038 | #endif |
3df80d93 ACM |
1039 | }; |
1040 | ||
41135cc8 | 1041 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1042 | .handler = dccp_v6_rcv, |
1043 | .err_handler = dccp_v6_err, | |
1044 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1045 | }; |
1046 | ||
5708e868 | 1047 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1048 | .family = PF_INET6, |
1049 | .owner = THIS_MODULE, | |
1050 | .release = inet6_release, | |
1051 | .bind = inet6_bind, | |
1052 | .connect = inet_stream_connect, | |
1053 | .socketpair = sock_no_socketpair, | |
1054 | .accept = inet_accept, | |
1055 | .getname = inet6_getname, | |
1056 | .poll = dccp_poll, | |
1057 | .ioctl = inet6_ioctl, | |
1058 | .listen = inet_dccp_listen, | |
1059 | .shutdown = inet_shutdown, | |
1060 | .setsockopt = sock_common_setsockopt, | |
1061 | .getsockopt = sock_common_getsockopt, | |
1062 | .sendmsg = inet_sendmsg, | |
1063 | .recvmsg = sock_common_recvmsg, | |
1064 | .mmap = sock_no_mmap, | |
1065 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1066 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1067 | .compat_setsockopt = compat_sock_common_setsockopt, |
1068 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1069 | #endif |
3df80d93 ACM |
1070 | }; |
1071 | ||
1072 | static struct inet_protosw dccp_v6_protosw = { | |
1073 | .type = SOCK_DCCP, | |
1074 | .protocol = IPPROTO_DCCP, | |
1075 | .prot = &dccp_v6_prot, | |
1076 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1077 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1078 | }; |
1079 | ||
2c8c1e72 | 1080 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1081 | { |
d14a0ebd GR |
1082 | if (dccp_hashinfo.bhash == NULL) |
1083 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1084 | |
d14a0ebd GR |
1085 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1086 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1087 | } |
1088 | ||
2c8c1e72 | 1089 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1090 | { |
334527d3 | 1091 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1092 | } |
1093 | ||
1094 | static struct pernet_operations dccp_v6_ops = { | |
1095 | .init = dccp_v6_init_net, | |
1096 | .exit = dccp_v6_exit_net, | |
1097 | }; | |
1098 | ||
3df80d93 ACM |
1099 | static int __init dccp_v6_init(void) |
1100 | { | |
1101 | int err = proto_register(&dccp_v6_prot, 1); | |
1102 | ||
1103 | if (err != 0) | |
1104 | goto out; | |
1105 | ||
1106 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1107 | if (err != 0) | |
1108 | goto out_unregister_proto; | |
1109 | ||
1110 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1111 | |
8231bd27 PE |
1112 | err = register_pernet_subsys(&dccp_v6_ops); |
1113 | if (err != 0) | |
1114 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1115 | out: |
1116 | return err; | |
8231bd27 PE |
1117 | |
1118 | out_destroy_ctl_sock: | |
72478873 ACM |
1119 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1120 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1121 | out_unregister_proto: |
1122 | proto_unregister(&dccp_v6_prot); | |
1123 | goto out; | |
1124 | } | |
1125 | ||
1126 | static void __exit dccp_v6_exit(void) | |
1127 | { | |
8231bd27 | 1128 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1129 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1130 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1131 | proto_unregister(&dccp_v6_prot); | |
1132 | } | |
1133 | ||
1134 | module_init(dccp_v6_init); | |
1135 | module_exit(dccp_v6_exit); | |
1136 | ||
1137 | /* | |
1138 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1139 | * values directly, Also cover the case where the protocol is not specified, | |
1140 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1141 | */ | |
7131c6c7 JD |
1142 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1143 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1144 | MODULE_LICENSE("GPL"); |
1145 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1146 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |