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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 | 18 | #include <linux/xfrm.h> |
323fbd0e | 19 | #include <linux/string.h> |
3df80d93 ACM |
20 | |
21 | #include <net/addrconf.h> | |
22 | #include <net/inet_common.h> | |
23 | #include <net/inet_hashtables.h> | |
14c85021 | 24 | #include <net/inet_sock.h> |
3df80d93 ACM |
25 | #include <net/inet6_connection_sock.h> |
26 | #include <net/inet6_hashtables.h> | |
27 | #include <net/ip6_route.h> | |
28 | #include <net/ipv6.h> | |
29 | #include <net/protocol.h> | |
30 | #include <net/transp_v6.h> | |
aa0e4e4a | 31 | #include <net/ip6_checksum.h> |
3df80d93 | 32 | #include <net/xfrm.h> |
6e5714ea | 33 | #include <net/secure_seq.h> |
323fbd0e | 34 | #include <net/sock.h> |
3df80d93 ACM |
35 | |
36 | #include "dccp.h" | |
37 | #include "ipv6.h" | |
4b79f0af | 38 | #include "feat.h" |
3df80d93 | 39 | |
13f51d82 | 40 | /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ |
72478873 | 41 | |
3b401a81 SH |
42 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
43 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; | |
3df80d93 | 44 | |
6f4e5fff | 45 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
868c86bc | 46 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
b71d1d42 ED |
47 | const struct in6_addr *saddr, |
48 | const struct in6_addr *daddr) | |
3df80d93 | 49 | { |
6f4e5fff GR |
50 | return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
51 | } | |
52 | ||
bb296246 | 53 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
6f4e5fff GR |
54 | { |
55 | struct ipv6_pinfo *np = inet6_sk(sk); | |
56 | struct dccp_hdr *dh = dccp_hdr(skb); | |
57 | ||
58 | dccp_csum_outgoing(skb); | |
efe4208f | 59 | dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); |
3df80d93 ACM |
60 | } |
61 | ||
6e5714ea | 62 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
d7f7365f | 63 | { |
0660e03f ACM |
64 | return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
65 | ipv6_hdr(skb)->saddr.s6_addr32, | |
d7f7365f GR |
66 | dccp_hdr(skb)->dccph_dport, |
67 | dccp_hdr(skb)->dccph_sport ); | |
68 | ||
3df80d93 ACM |
69 | } |
70 | ||
3df80d93 | 71 | static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 72 | u8 type, u8 code, int offset, __be32 info) |
3df80d93 | 73 | { |
b71d1d42 | 74 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
1aa9d1a0 | 75 | const struct dccp_hdr *dh; |
e0bcfb0c | 76 | struct dccp_sock *dp; |
3df80d93 ACM |
77 | struct ipv6_pinfo *np; |
78 | struct sock *sk; | |
79 | int err; | |
80 | __u64 seq; | |
ca12a1a4 | 81 | struct net *net = dev_net(skb->dev); |
3df80d93 | 82 | |
1aa9d1a0 ED |
83 | /* Only need dccph_dport & dccph_sport which are the first |
84 | * 4 bytes in dccp header. | |
85 | * Our caller (icmpv6_notify()) already pulled 8 bytes for us. | |
86 | */ | |
87 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
88 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
89 | dh = (struct dccp_hdr *)(skb->data + offset); | |
860239c5 | 90 | |
52036a43 ED |
91 | sk = __inet6_lookup_established(net, &dccp_hashinfo, |
92 | &hdr->daddr, dh->dccph_dport, | |
93 | &hdr->saddr, ntohs(dh->dccph_sport), | |
4297a0ef | 94 | inet6_iif(skb), 0); |
3df80d93 | 95 | |
52036a43 | 96 | if (!sk) { |
a16292a0 ED |
97 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
98 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
99 | return; |
100 | } | |
101 | ||
102 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 103 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
104 | return; |
105 | } | |
52036a43 ED |
106 | seq = dccp_hdr_seq(dh); |
107 | if (sk->sk_state == DCCP_NEW_SYN_RECV) | |
108 | return dccp_req_err(sk, seq); | |
3df80d93 ACM |
109 | |
110 | bh_lock_sock(sk); | |
111 | if (sock_owned_by_user(sk)) | |
02a1d6e7 | 112 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
113 | |
114 | if (sk->sk_state == DCCP_CLOSED) | |
115 | goto out; | |
116 | ||
e0bcfb0c | 117 | dp = dccp_sk(sk); |
e0bcfb0c WY |
118 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
119 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
02a1d6e7 | 120 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
e0bcfb0c WY |
121 | goto out; |
122 | } | |
123 | ||
3df80d93 ACM |
124 | np = inet6_sk(sk); |
125 | ||
ec18d9a2 | 126 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
127 | if (!sock_owned_by_user(sk)) { |
128 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 129 | |
45caeaa5 JM |
130 | if (dst) |
131 | dst->ops->redirect(dst, sk, skb); | |
132 | } | |
bd784a14 | 133 | goto out; |
ec18d9a2 DM |
134 | } |
135 | ||
3df80d93 | 136 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
137 | struct dst_entry *dst = NULL; |
138 | ||
93b36cf3 HFS |
139 | if (!ip6_sk_accept_pmtu(sk)) |
140 | goto out; | |
141 | ||
3df80d93 ACM |
142 | if (sock_owned_by_user(sk)) |
143 | goto out; | |
144 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
145 | goto out; | |
146 | ||
35ad9b9c DM |
147 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
148 | if (!dst) | |
149 | goto out; | |
150 | ||
151 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 152 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
153 | goto out; |
154 | } | |
155 | ||
156 | icmpv6_err_convert(type, code, &err); | |
157 | ||
3df80d93 ACM |
158 | /* Might be for an request_sock */ |
159 | switch (sk->sk_state) { | |
3df80d93 ACM |
160 | case DCCP_REQUESTING: |
161 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 162 | It can, it SYNs are crossed. --ANK */ |
3df80d93 | 163 | if (!sock_owned_by_user(sk)) { |
aa62d76b | 164 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
165 | sk->sk_err = err; |
166 | /* | |
167 | * Wake people up to see the error | |
168 | * (see connect in sock.c) | |
169 | */ | |
170 | sk->sk_error_report(sk); | |
3df80d93 ACM |
171 | dccp_done(sk); |
172 | } else | |
173 | sk->sk_err_soft = err; | |
174 | goto out; | |
175 | } | |
176 | ||
177 | if (!sock_owned_by_user(sk) && np->recverr) { | |
178 | sk->sk_err = err; | |
179 | sk->sk_error_report(sk); | |
180 | } else | |
181 | sk->sk_err_soft = err; | |
182 | ||
183 | out: | |
184 | bh_unlock_sock(sk); | |
185 | sock_put(sk); | |
186 | } | |
187 | ||
188 | ||
ea3bea3a | 189 | static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
3df80d93 | 190 | { |
634fb979 | 191 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
192 | struct ipv6_pinfo *np = inet6_sk(sk); |
193 | struct sk_buff *skb; | |
20c59de2 | 194 | struct in6_addr *final_p, final; |
4c9483b2 | 195 | struct flowi6 fl6; |
3df80d93 | 196 | int err = -1; |
fd80eb94 | 197 | struct dst_entry *dst; |
3df80d93 | 198 | |
4c9483b2 DM |
199 | memset(&fl6, 0, sizeof(fl6)); |
200 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
201 | fl6.daddr = ireq->ir_v6_rmt_addr; |
202 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 203 | fl6.flowlabel = 0; |
634fb979 ED |
204 | fl6.flowi6_oif = ireq->ir_iif; |
205 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 206 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 207 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 208 | |
3df80d93 | 209 | |
45f6fad8 ED |
210 | rcu_read_lock(); |
211 | final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); | |
212 | rcu_read_unlock(); | |
3df80d93 | 213 | |
0e0d44ab | 214 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
215 | if (IS_ERR(dst)) { |
216 | err = PTR_ERR(dst); | |
217 | dst = NULL; | |
fd80eb94 | 218 | goto done; |
68d0c6d3 | 219 | } |
3df80d93 ACM |
220 | |
221 | skb = dccp_make_response(sk, dst, req); | |
222 | if (skb != NULL) { | |
223 | struct dccp_hdr *dh = dccp_hdr(skb); | |
56ac42bc | 224 | struct ipv6_txoptions *opt; |
45329e71 | 225 | |
6f4e5fff | 226 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
227 | &ireq->ir_v6_loc_addr, |
228 | &ireq->ir_v6_rmt_addr); | |
229 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
45f6fad8 | 230 | rcu_read_lock(); |
56ac42bc HD |
231 | opt = ireq->ipv6_opt; |
232 | if (!opt) | |
233 | opt = rcu_dereference(np->opt); | |
92e55f41 | 234 | err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass); |
45f6fad8 | 235 | rcu_read_unlock(); |
b9df3cb8 | 236 | err = net_xmit_eval(err); |
3df80d93 ACM |
237 | } |
238 | ||
239 | done: | |
0cbd7825 | 240 | dst_release(dst); |
3df80d93 ACM |
241 | return err; |
242 | } | |
243 | ||
244 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
245 | { | |
d99a7bd2 | 246 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
56ac42bc | 247 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 248 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
249 | } |
250 | ||
a00e7444 | 251 | static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 252 | { |
b71d1d42 | 253 | const struct ipv6hdr *rxip6h; |
3df80d93 | 254 | struct sk_buff *skb; |
4c9483b2 | 255 | struct flowi6 fl6; |
adf30907 | 256 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 257 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 258 | struct dst_entry *dst; |
3df80d93 | 259 | |
e356d37a | 260 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
261 | return; |
262 | ||
263 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 264 | return; |
3df80d93 | 265 | |
02047741 | 266 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 267 | if (skb == NULL) |
8109b02b | 268 | return; |
3df80d93 | 269 | |
0660e03f | 270 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
271 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
272 | &rxip6h->daddr); | |
6f4e5fff | 273 | |
4c9483b2 | 274 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
275 | fl6.daddr = rxip6h->saddr; |
276 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 277 | |
4c9483b2 DM |
278 | fl6.flowi6_proto = IPPROTO_DCCP; |
279 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
280 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
281 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 282 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
283 | |
284 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 285 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
286 | if (!IS_ERR(dst)) { |
287 | skb_dst_set(skb, dst); | |
92e55f41 | 288 | ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0); |
7309f882 ED |
289 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
290 | DCCP_INC_STATS(DCCP_MIB_OUTRSTS); | |
68d0c6d3 | 291 | return; |
3df80d93 ACM |
292 | } |
293 | ||
294 | kfree_skb(skb); | |
295 | } | |
296 | ||
73c9e02c GR |
297 | static struct request_sock_ops dccp6_request_sock_ops = { |
298 | .family = AF_INET6, | |
299 | .obj_size = sizeof(struct dccp6_request_sock), | |
300 | .rtx_syn_ack = dccp_v6_send_response, | |
301 | .send_ack = dccp_reqsk_send_ack, | |
302 | .destructor = dccp_v6_reqsk_destructor, | |
303 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 304 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
305 | }; |
306 | ||
3df80d93 ACM |
307 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
308 | { | |
3df80d93 ACM |
309 | struct request_sock *req; |
310 | struct dccp_request_sock *dreq; | |
634fb979 | 311 | struct inet_request_sock *ireq; |
3df80d93 | 312 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 313 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 314 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
315 | |
316 | if (skb->protocol == htons(ETH_P_IP)) | |
317 | return dccp_v4_conn_request(sk, skb); | |
318 | ||
319 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 320 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
321 | |
322 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 323 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 324 | goto drop; |
8109b02b | 325 | } |
3df80d93 | 326 | /* |
45329e71 | 327 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 328 | */ |
4a5409a5 | 329 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 330 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 331 | goto drop; |
3df80d93 | 332 | |
5ea8ea2c | 333 | if (sk_acceptq_is_full(sk)) |
3df80d93 ACM |
334 | goto drop; |
335 | ||
a1a5344d | 336 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
3df80d93 ACM |
337 | if (req == NULL) |
338 | goto drop; | |
339 | ||
ac75773c GR |
340 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
341 | goto drop_and_free; | |
3df80d93 | 342 | |
8b819412 GR |
343 | dreq = dccp_rsk(req); |
344 | if (dccp_parse_options(sk, dreq, skb)) | |
345 | goto drop_and_free; | |
346 | ||
4237c75c VY |
347 | if (security_inet_conn_request(sk, skb, req)) |
348 | goto drop_and_free; | |
349 | ||
634fb979 ED |
350 | ireq = inet_rsk(req); |
351 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
352 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 353 | ireq->ireq_family = AF_INET6; |
b855ff82 | 354 | ireq->ir_mark = inet_request_mark(sk, skb); |
3df80d93 | 355 | |
a224772d | 356 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
357 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
358 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
63354797 | 359 | refcount_inc(&skb->users); |
634fb979 | 360 | ireq->pktopts = skb; |
3df80d93 | 361 | } |
634fb979 | 362 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
363 | |
364 | /* So that link locals have meaning */ | |
365 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
366 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
367 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 368 | |
45329e71 | 369 | /* |
3df80d93 ACM |
370 | * Step 3: Process LISTEN state |
371 | * | |
d83ca5ac | 372 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 373 | * |
f541fb7e | 374 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 375 | */ |
3df80d93 | 376 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 377 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 378 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 379 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
380 | dreq->dreq_service = service; |
381 | ||
1a2c6181 | 382 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
383 | goto drop_and_free; |
384 | ||
079096f1 | 385 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
0c2232b0 | 386 | reqsk_put(req); |
3df80d93 ACM |
387 | return 0; |
388 | ||
389 | drop_and_free: | |
390 | reqsk_free(req); | |
391 | drop: | |
aa62d76b | 392 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
393 | return -1; |
394 | } | |
395 | ||
0c27171e | 396 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
3df80d93 ACM |
397 | struct sk_buff *skb, |
398 | struct request_sock *req, | |
5e0724d0 ED |
399 | struct dst_entry *dst, |
400 | struct request_sock *req_unhash, | |
401 | bool *own_req) | |
3df80d93 | 402 | { |
634fb979 | 403 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
404 | struct ipv6_pinfo *newnp; |
405 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 406 | struct ipv6_txoptions *opt; |
3df80d93 | 407 | struct inet_sock *newinet; |
3df80d93 ACM |
408 | struct dccp6_sock *newdp6; |
409 | struct sock *newsk; | |
3df80d93 ACM |
410 | |
411 | if (skb->protocol == htons(ETH_P_IP)) { | |
412 | /* | |
413 | * v6 mapped | |
414 | */ | |
5e0724d0 ED |
415 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
416 | req_unhash, own_req); | |
45329e71 | 417 | if (newsk == NULL) |
3df80d93 ACM |
418 | return NULL; |
419 | ||
420 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
421 | newinet = inet_sk(newsk); |
422 | newinet->pinet6 = &newdp6->inet6; | |
423 | newnp = inet6_sk(newsk); | |
424 | ||
425 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
426 | ||
d1e559d0 | 427 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
428 | |
429 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
430 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
431 | newnp->pktoptions = NULL; | |
432 | newnp->opt = NULL; | |
83eaddab WC |
433 | newnp->ipv6_mc_list = NULL; |
434 | newnp->ipv6_ac_list = NULL; | |
435 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 436 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 437 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
438 | |
439 | /* | |
440 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
441 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
442 | * that function for the gory details. -acme | |
443 | */ | |
444 | ||
445 | /* It is tricky place. Until this moment IPv4 tcp | |
446 | worked with IPv6 icsk.icsk_af_ops. | |
447 | Sync it now. | |
448 | */ | |
d83d8461 | 449 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
450 | |
451 | return newsk; | |
452 | } | |
453 | ||
3df80d93 ACM |
454 | |
455 | if (sk_acceptq_is_full(sk)) | |
456 | goto out_overflow; | |
457 | ||
f76b33c3 | 458 | if (!dst) { |
4c9483b2 DM |
459 | struct flowi6 fl6; |
460 | ||
f76b33c3 ED |
461 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
462 | if (!dst) | |
3df80d93 | 463 | goto out; |
45329e71 | 464 | } |
3df80d93 ACM |
465 | |
466 | newsk = dccp_create_openreq_child(sk, req, skb); | |
467 | if (newsk == NULL) | |
093d2823 | 468 | goto out_nonewsk; |
3df80d93 ACM |
469 | |
470 | /* | |
471 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
472 | * count here, dccp_create_openreq_child now does this for us, see the | |
473 | * comment in that function for the gory details. -acme | |
474 | */ | |
475 | ||
6bd4f355 | 476 | ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
477 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
478 | NETIF_F_TSO); | |
3df80d93 ACM |
479 | newdp6 = (struct dccp6_sock *)newsk; |
480 | newinet = inet_sk(newsk); | |
481 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
482 | newnp = inet6_sk(newsk); |
483 | ||
484 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
485 | ||
634fb979 ED |
486 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
487 | newnp->saddr = ireq->ir_v6_loc_addr; | |
488 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
489 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 490 | |
45329e71 | 491 | /* Now IPv6 options... |
3df80d93 ACM |
492 | |
493 | First: no IPv4 options. | |
494 | */ | |
f6d8bd05 | 495 | newinet->inet_opt = NULL; |
3df80d93 ACM |
496 | |
497 | /* Clone RX bits */ | |
498 | newnp->rxopt.all = np->rxopt.all; | |
499 | ||
83eaddab WC |
500 | newnp->ipv6_mc_list = NULL; |
501 | newnp->ipv6_ac_list = NULL; | |
502 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 503 | newnp->pktoptions = NULL; |
3df80d93 ACM |
504 | newnp->opt = NULL; |
505 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 506 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 507 | |
45329e71 ACM |
508 | /* |
509 | * Clone native IPv6 options from listening socket (if any) | |
510 | * | |
511 | * Yes, keeping reference count would be much more clever, but we make | |
512 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 513 | */ |
56ac42bc HD |
514 | opt = ireq->ipv6_opt; |
515 | if (!opt) | |
516 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
517 | if (opt) { |
518 | opt = ipv6_dup_options(newsk, opt); | |
519 | RCU_INIT_POINTER(newnp->opt, opt); | |
520 | } | |
d83d8461 | 521 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
522 | if (opt) |
523 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
524 | opt->opt_flen; | |
3df80d93 ACM |
525 | |
526 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
527 | ||
c720c7e8 ED |
528 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
529 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 530 | |
093d2823 | 531 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
532 | inet_csk_prepare_forced_close(newsk); |
533 | dccp_done(newsk); | |
093d2823 BS |
534 | goto out; |
535 | } | |
5e0724d0 | 536 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
ce105008 ED |
537 | /* Clone pktoptions received with SYN, if we own the req */ |
538 | if (*own_req && ireq->pktopts) { | |
539 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
540 | consume_skb(ireq->pktopts); | |
541 | ireq->pktopts = NULL; | |
542 | if (newnp->pktoptions) | |
543 | skb_set_owner_r(newnp->pktoptions, newsk); | |
544 | } | |
3df80d93 ACM |
545 | |
546 | return newsk; | |
547 | ||
548 | out_overflow: | |
02a1d6e7 | 549 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
550 | out_nonewsk: |
551 | dst_release(dst); | |
3df80d93 | 552 | out: |
02a1d6e7 | 553 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
554 | return NULL; |
555 | } | |
556 | ||
557 | /* The socket must have it's spinlock held when we get | |
558 | * here. | |
559 | * | |
560 | * We have a potential double-lock case here, so even when | |
561 | * doing backlog processing we use the BH locking scheme. | |
562 | * This is because we cannot sleep with the original spinlock | |
563 | * held. | |
564 | */ | |
565 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
566 | { | |
567 | struct ipv6_pinfo *np = inet6_sk(sk); | |
568 | struct sk_buff *opt_skb = NULL; | |
569 | ||
570 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
571 | goes to IPv4 receive handler and backlogged. | |
572 | From backlog it always goes here. Kerboom... | |
573 | Fortunately, dccp_rcv_established and rcv_established | |
574 | handle them correctly, but it is not case with | |
575 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
576 | */ | |
577 | ||
578 | if (skb->protocol == htons(ETH_P_IP)) | |
579 | return dccp_v4_do_rcv(sk, skb); | |
580 | ||
fda9ef5d | 581 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
582 | goto discard; |
583 | ||
584 | /* | |
45329e71 ACM |
585 | * socket locking is here for SMP purposes as backlog rcv is currently |
586 | * called with bh processing disabled. | |
3df80d93 ACM |
587 | */ |
588 | ||
589 | /* Do Stevens' IPV6_PKTOPTIONS. | |
590 | ||
591 | Yes, guys, it is the only place in our code, where we | |
592 | may make it not affecting IPv4. | |
593 | The rest of code is protocol independent, | |
594 | and I do not like idea to uglify IPv4. | |
595 | ||
596 | Actually, all the idea behind IPV6_PKTOPTIONS | |
597 | looks not very well thought. For now we latch | |
598 | options, received in the last packet, enqueued | |
599 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 600 | --ANK (980728) |
3df80d93 ACM |
601 | */ |
602 | if (np->rxopt.all) | |
603 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
604 | ||
605 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
606 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
607 | goto reset; | |
323fbd0e A |
608 | if (opt_skb) |
609 | goto ipv6_pktoptions; | |
3df80d93 ACM |
610 | return 0; |
611 | } | |
612 | ||
d83ca5ac GR |
613 | /* |
614 | * Step 3: Process LISTEN state | |
615 | * If S.state == LISTEN, | |
616 | * If P.type == Request or P contains a valid Init Cookie option, | |
617 | * (* Must scan the packet's options to check for Init | |
618 | * Cookies. Only Init Cookies are processed here, | |
619 | * however; other options are processed in Step 8. This | |
620 | * scan need only be performed if the endpoint uses Init | |
621 | * Cookies *) | |
622 | * (* Generate a new socket and switch to that socket *) | |
623 | * Set S := new socket for this port pair | |
624 | * S.state = RESPOND | |
625 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
626 | * Initialize S.GAR := S.ISS | |
627 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
628 | * Continue with S.state == RESPOND | |
629 | * (* A Response packet will be generated in Step 11 *) | |
630 | * Otherwise, | |
631 | * Generate Reset(No Connection) unless P.type == Reset | |
632 | * Drop packet and return | |
633 | * | |
634 | * NOTE: the check for the packet types is done in | |
635 | * dccp_rcv_state_process | |
636 | */ | |
3df80d93 ACM |
637 | |
638 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
639 | goto reset; | |
323fbd0e A |
640 | if (opt_skb) |
641 | goto ipv6_pktoptions; | |
3df80d93 ACM |
642 | return 0; |
643 | ||
644 | reset: | |
cfb6eeb4 | 645 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 646 | discard: |
45329e71 | 647 | if (opt_skb != NULL) |
3df80d93 ACM |
648 | __kfree_skb(opt_skb); |
649 | kfree_skb(skb); | |
650 | return 0; | |
323fbd0e A |
651 | |
652 | /* Handling IPV6_PKTOPTIONS skb the similar | |
653 | * way it's done for net/ipv6/tcp_ipv6.c | |
654 | */ | |
655 | ipv6_pktoptions: | |
656 | if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) { | |
657 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) | |
658 | np->mcast_oif = inet6_iif(opt_skb); | |
659 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) | |
660 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; | |
661 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) | |
662 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); | |
663 | if (np->repflow) | |
664 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
665 | if (ipv6_opt_accepted(sk, opt_skb, | |
666 | &DCCP_SKB_CB(opt_skb)->header.h6)) { | |
667 | skb_set_owner_r(opt_skb, sk); | |
668 | memmove(IP6CB(opt_skb), | |
669 | &DCCP_SKB_CB(opt_skb)->header.h6, | |
670 | sizeof(struct inet6_skb_parm)); | |
671 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
672 | } else { | |
673 | __kfree_skb(opt_skb); | |
674 | opt_skb = xchg(&np->pktoptions, NULL); | |
675 | } | |
676 | } | |
677 | ||
678 | kfree_skb(opt_skb); | |
679 | return 0; | |
3df80d93 ACM |
680 | } |
681 | ||
e5bbef20 | 682 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
683 | { |
684 | const struct dccp_hdr *dh; | |
3b24d854 | 685 | bool refcounted; |
3df80d93 | 686 | struct sock *sk; |
6f4e5fff | 687 | int min_cov; |
3df80d93 | 688 | |
6f4e5fff | 689 | /* Step 1: Check header basics */ |
3df80d93 ACM |
690 | |
691 | if (dccp_invalid_packet(skb)) | |
692 | goto discard_it; | |
693 | ||
6f4e5fff | 694 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
695 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
696 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 697 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
698 | goto discard_it; |
699 | } | |
700 | ||
3df80d93 ACM |
701 | dh = dccp_hdr(skb); |
702 | ||
fde20105 | 703 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
704 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
705 | ||
706 | if (dccp_packet_without_ack(skb)) | |
707 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
708 | else | |
709 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
710 | ||
4bdc3d66 | 711 | lookup: |
a583636a | 712 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh), |
870c3151 | 713 | dh->dccph_sport, dh->dccph_dport, |
4297a0ef | 714 | inet6_iif(skb), 0, &refcounted); |
4bdc3d66 | 715 | if (!sk) { |
d23c7107 GR |
716 | dccp_pr_debug("failed to look up flow ID in table and " |
717 | "get corresponding socket\n"); | |
3df80d93 | 718 | goto no_dccp_socket; |
d23c7107 | 719 | } |
3df80d93 | 720 | |
45329e71 | 721 | /* |
3df80d93 | 722 | * Step 2: |
8109b02b | 723 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
724 | * Generate Reset(No Connection) unless P.type == Reset |
725 | * Drop packet and return | |
726 | */ | |
d23c7107 GR |
727 | if (sk->sk_state == DCCP_TIME_WAIT) { |
728 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
729 | inet_twsk_put(inet_twsk(sk)); | |
730 | goto no_dccp_socket; | |
731 | } | |
3df80d93 | 732 | |
079096f1 ED |
733 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
734 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 735 | struct sock *nsk; |
079096f1 ED |
736 | |
737 | sk = req->rsk_listener; | |
7716682c | 738 | if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
f03f2e15 | 739 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
740 | goto lookup; |
741 | } | |
7716682c | 742 | sock_hold(sk); |
3b24d854 | 743 | refcounted = true; |
7716682c | 744 | nsk = dccp_check_req(sk, skb, req); |
079096f1 ED |
745 | if (!nsk) { |
746 | reqsk_put(req); | |
7716682c | 747 | goto discard_and_relse; |
079096f1 ED |
748 | } |
749 | if (nsk == sk) { | |
079096f1 ED |
750 | reqsk_put(req); |
751 | } else if (dccp_child_process(sk, nsk, skb)) { | |
752 | dccp_v6_ctl_send_reset(sk, skb); | |
7716682c | 753 | goto discard_and_relse; |
079096f1 | 754 | } else { |
7716682c | 755 | sock_put(sk); |
079096f1 ED |
756 | return 0; |
757 | } | |
758 | } | |
6f4e5fff GR |
759 | /* |
760 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
761 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
762 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
763 | */ |
764 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
765 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
766 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
767 | dh->dccph_cscov, min_cov); | |
768 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
769 | goto discard_and_relse; | |
770 | } | |
771 | ||
3df80d93 ACM |
772 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
773 | goto discard_and_relse; | |
774 | ||
c3f24cfb ED |
775 | return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, |
776 | refcounted) ? -1 : 0; | |
3df80d93 ACM |
777 | |
778 | no_dccp_socket: | |
779 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
780 | goto discard_it; | |
781 | /* | |
782 | * Step 2: | |
8109b02b | 783 | * If no socket ... |
3df80d93 ACM |
784 | * Generate Reset(No Connection) unless P.type == Reset |
785 | * Drop packet and return | |
786 | */ | |
787 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
788 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
789 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 790 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 791 | } |
3df80d93 | 792 | |
d23c7107 | 793 | discard_it: |
3df80d93 ACM |
794 | kfree_skb(skb); |
795 | return 0; | |
796 | ||
797 | discard_and_relse: | |
3b24d854 ED |
798 | if (refcounted) |
799 | sock_put(sk); | |
3df80d93 | 800 | goto discard_it; |
3df80d93 ACM |
801 | } |
802 | ||
73c9e02c GR |
803 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
804 | int addr_len) | |
805 | { | |
806 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
807 | struct inet_connection_sock *icsk = inet_csk(sk); | |
808 | struct inet_sock *inet = inet_sk(sk); | |
809 | struct ipv6_pinfo *np = inet6_sk(sk); | |
810 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 811 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 812 | struct ipv6_txoptions *opt; |
4c9483b2 | 813 | struct flowi6 fl6; |
73c9e02c GR |
814 | struct dst_entry *dst; |
815 | int addr_type; | |
816 | int err; | |
817 | ||
818 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
819 | ||
820 | if (addr_len < SIN6_LEN_RFC2133) | |
821 | return -EINVAL; | |
822 | ||
823 | if (usin->sin6_family != AF_INET6) | |
824 | return -EAFNOSUPPORT; | |
825 | ||
4c9483b2 | 826 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
827 | |
828 | if (np->sndflow) { | |
4c9483b2 DM |
829 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
830 | IP6_ECN_flow_init(fl6.flowlabel); | |
831 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 832 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 833 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
834 | if (flowlabel == NULL) |
835 | return -EINVAL; | |
73c9e02c GR |
836 | fl6_sock_release(flowlabel); |
837 | } | |
838 | } | |
839 | /* | |
840 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
841 | */ | |
842 | if (ipv6_addr_any(&usin->sin6_addr)) | |
843 | usin->sin6_addr.s6_addr[15] = 1; | |
844 | ||
845 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
846 | ||
847 | if (addr_type & IPV6_ADDR_MULTICAST) | |
848 | return -ENETUNREACH; | |
849 | ||
850 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
851 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
852 | usin->sin6_scope_id) { | |
853 | /* If interface is set while binding, indices | |
854 | * must coincide. | |
855 | */ | |
856 | if (sk->sk_bound_dev_if && | |
857 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
858 | return -EINVAL; | |
859 | ||
860 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
861 | } | |
862 | ||
863 | /* Connect to link-local address requires an interface */ | |
864 | if (!sk->sk_bound_dev_if) | |
865 | return -EINVAL; | |
866 | } | |
867 | ||
efe4208f | 868 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 869 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
870 | |
871 | /* | |
872 | * DCCP over IPv4 | |
873 | */ | |
874 | if (addr_type == IPV6_ADDR_MAPPED) { | |
875 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
876 | struct sockaddr_in sin; | |
877 | ||
878 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
879 | ||
880 | if (__ipv6_only_sock(sk)) | |
881 | return -ENETUNREACH; | |
882 | ||
883 | sin.sin_family = AF_INET; | |
884 | sin.sin_port = usin->sin6_port; | |
885 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
886 | ||
887 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
888 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
889 | ||
890 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
891 | if (err) { | |
892 | icsk->icsk_ext_hdr_len = exthdrlen; | |
893 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
894 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
895 | goto failure; | |
73c9e02c | 896 | } |
d1e559d0 | 897 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
898 | return err; |
899 | } | |
900 | ||
efe4208f ED |
901 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
902 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 903 | |
4c9483b2 | 904 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 905 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 906 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 907 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
908 | fl6.fl6_dport = usin->sin6_port; |
909 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 910 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 911 | |
1e1d04e6 | 912 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 913 | final_p = fl6_update_dst(&fl6, opt, &final); |
73c9e02c | 914 | |
0e0d44ab | 915 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
916 | if (IS_ERR(dst)) { |
917 | err = PTR_ERR(dst); | |
73c9e02c | 918 | goto failure; |
14e50e57 | 919 | } |
73c9e02c GR |
920 | |
921 | if (saddr == NULL) { | |
4c9483b2 | 922 | saddr = &fl6.saddr; |
efe4208f | 923 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
924 | } |
925 | ||
926 | /* set the source address */ | |
4e3fd7a0 | 927 | np->saddr = *saddr; |
c720c7e8 | 928 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c | 929 | |
6bd4f355 | 930 | ip6_dst_store(sk, dst, NULL, NULL); |
73c9e02c GR |
931 | |
932 | icsk->icsk_ext_hdr_len = 0; | |
45f6fad8 ED |
933 | if (opt) |
934 | icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; | |
73c9e02c | 935 | |
c720c7e8 | 936 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
937 | |
938 | dccp_set_state(sk, DCCP_REQUESTING); | |
939 | err = inet6_hash_connect(&dccp_death_row, sk); | |
940 | if (err) | |
941 | goto late_failure; | |
d7f7365f GR |
942 | |
943 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 944 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
945 | inet->inet_sport, |
946 | inet->inet_dport); | |
73c9e02c GR |
947 | err = dccp_connect(sk); |
948 | if (err) | |
949 | goto late_failure; | |
950 | ||
951 | return 0; | |
952 | ||
953 | late_failure: | |
954 | dccp_set_state(sk, DCCP_CLOSED); | |
955 | __sk_dst_reset(sk); | |
956 | failure: | |
c720c7e8 | 957 | inet->inet_dport = 0; |
73c9e02c GR |
958 | sk->sk_route_caps = 0; |
959 | return err; | |
960 | } | |
961 | ||
3b401a81 | 962 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
963 | .queue_xmit = inet6_csk_xmit, |
964 | .send_check = dccp_v6_send_check, | |
965 | .rebuild_header = inet6_sk_rebuild_header, | |
966 | .conn_request = dccp_v6_conn_request, | |
967 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
968 | .net_header_len = sizeof(struct ipv6hdr), | |
969 | .setsockopt = ipv6_setsockopt, | |
970 | .getsockopt = ipv6_getsockopt, | |
971 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
972 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 973 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
974 | .compat_setsockopt = compat_ipv6_setsockopt, |
975 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 976 | #endif |
3df80d93 ACM |
977 | }; |
978 | ||
979 | /* | |
980 | * DCCP over IPv4 via INET6 API | |
981 | */ | |
3b401a81 | 982 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
983 | .queue_xmit = ip_queue_xmit, |
984 | .send_check = dccp_v4_send_check, | |
985 | .rebuild_header = inet_sk_rebuild_header, | |
986 | .conn_request = dccp_v6_conn_request, | |
987 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
988 | .net_header_len = sizeof(struct iphdr), | |
989 | .setsockopt = ipv6_setsockopt, | |
990 | .getsockopt = ipv6_getsockopt, | |
991 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
992 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 993 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
994 | .compat_setsockopt = compat_ipv6_setsockopt, |
995 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 996 | #endif |
3df80d93 ACM |
997 | }; |
998 | ||
999 | /* NOTE: A lot of things set to zero explicitly by call to | |
1000 | * sk_alloc() so need not be done here. | |
1001 | */ | |
1002 | static int dccp_v6_init_sock(struct sock *sk) | |
1003 | { | |
72478873 ACM |
1004 | static __u8 dccp_v6_ctl_sock_initialized; |
1005 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 1006 | |
72478873 ACM |
1007 | if (err == 0) { |
1008 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
1009 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 1010 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 1011 | } |
3df80d93 ACM |
1012 | |
1013 | return err; | |
1014 | } | |
1015 | ||
7d06b2e0 | 1016 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 1017 | { |
3e0fadc5 | 1018 | dccp_destroy_sock(sk); |
7d06b2e0 | 1019 | inet6_destroy_sock(sk); |
3df80d93 ACM |
1020 | } |
1021 | ||
73c9e02c GR |
1022 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1023 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1024 | }; | |
1025 | ||
3df80d93 | 1026 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1027 | .name = "DCCPv6", |
1028 | .owner = THIS_MODULE, | |
1029 | .close = dccp_close, | |
1030 | .connect = dccp_v6_connect, | |
1031 | .disconnect = dccp_disconnect, | |
1032 | .ioctl = dccp_ioctl, | |
1033 | .init = dccp_v6_init_sock, | |
1034 | .setsockopt = dccp_setsockopt, | |
1035 | .getsockopt = dccp_getsockopt, | |
1036 | .sendmsg = dccp_sendmsg, | |
1037 | .recvmsg = dccp_recvmsg, | |
1038 | .backlog_rcv = dccp_v6_do_rcv, | |
496611d7 | 1039 | .hash = inet6_hash, |
ab1e0a13 | 1040 | .unhash = inet_unhash, |
543d9cfe | 1041 | .accept = inet_csk_accept, |
ab1e0a13 | 1042 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1043 | .shutdown = dccp_shutdown, |
1044 | .destroy = dccp_v6_destroy_sock, | |
1045 | .orphan_count = &dccp_orphan_count, | |
1046 | .max_header = MAX_DCCP_HEADER, | |
1047 | .obj_size = sizeof(struct dccp6_sock), | |
5f0d5a3a | 1048 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
543d9cfe ACM |
1049 | .rsk_prot = &dccp6_request_sock_ops, |
1050 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1051 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1052 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1053 | .compat_setsockopt = compat_dccp_setsockopt, |
1054 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1055 | #endif |
3df80d93 ACM |
1056 | }; |
1057 | ||
41135cc8 | 1058 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1059 | .handler = dccp_v6_rcv, |
1060 | .err_handler = dccp_v6_err, | |
1061 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1062 | }; |
1063 | ||
5708e868 | 1064 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1065 | .family = PF_INET6, |
1066 | .owner = THIS_MODULE, | |
1067 | .release = inet6_release, | |
1068 | .bind = inet6_bind, | |
1069 | .connect = inet_stream_connect, | |
1070 | .socketpair = sock_no_socketpair, | |
1071 | .accept = inet_accept, | |
1072 | .getname = inet6_getname, | |
a11e1d43 | 1073 | .poll = dccp_poll, |
543d9cfe ACM |
1074 | .ioctl = inet6_ioctl, |
1075 | .listen = inet_dccp_listen, | |
1076 | .shutdown = inet_shutdown, | |
1077 | .setsockopt = sock_common_setsockopt, | |
1078 | .getsockopt = sock_common_getsockopt, | |
1079 | .sendmsg = inet_sendmsg, | |
1080 | .recvmsg = sock_common_recvmsg, | |
1081 | .mmap = sock_no_mmap, | |
1082 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1083 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1084 | .compat_setsockopt = compat_sock_common_setsockopt, |
1085 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1086 | #endif |
3df80d93 ACM |
1087 | }; |
1088 | ||
1089 | static struct inet_protosw dccp_v6_protosw = { | |
1090 | .type = SOCK_DCCP, | |
1091 | .protocol = IPPROTO_DCCP, | |
1092 | .prot = &dccp_v6_prot, | |
1093 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1094 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1095 | }; |
1096 | ||
2c8c1e72 | 1097 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1098 | { |
d14a0ebd GR |
1099 | if (dccp_hashinfo.bhash == NULL) |
1100 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1101 | |
d14a0ebd GR |
1102 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1103 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1104 | } |
1105 | ||
2c8c1e72 | 1106 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1107 | { |
334527d3 | 1108 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1109 | } |
1110 | ||
ec7cb62d AR |
1111 | static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
1112 | { | |
1113 | inet_twsk_purge(&dccp_hashinfo, AF_INET6); | |
1114 | } | |
1115 | ||
8231bd27 PE |
1116 | static struct pernet_operations dccp_v6_ops = { |
1117 | .init = dccp_v6_init_net, | |
1118 | .exit = dccp_v6_exit_net, | |
ec7cb62d | 1119 | .exit_batch = dccp_v6_exit_batch, |
8231bd27 PE |
1120 | }; |
1121 | ||
3df80d93 ACM |
1122 | static int __init dccp_v6_init(void) |
1123 | { | |
1124 | int err = proto_register(&dccp_v6_prot, 1); | |
1125 | ||
a0f9a4c2 | 1126 | if (err) |
3df80d93 ACM |
1127 | goto out; |
1128 | ||
3df80d93 | 1129 | inet6_register_protosw(&dccp_v6_protosw); |
72478873 | 1130 | |
8231bd27 | 1131 | err = register_pernet_subsys(&dccp_v6_ops); |
a0f9a4c2 | 1132 | if (err) |
8231bd27 | 1133 | goto out_destroy_ctl_sock; |
a0f9a4c2 XL |
1134 | |
1135 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1136 | if (err) | |
1137 | goto out_unregister_proto; | |
1138 | ||
3df80d93 ACM |
1139 | out: |
1140 | return err; | |
a0f9a4c2 XL |
1141 | out_unregister_proto: |
1142 | unregister_pernet_subsys(&dccp_v6_ops); | |
8231bd27 | 1143 | out_destroy_ctl_sock: |
72478873 | 1144 | inet6_unregister_protosw(&dccp_v6_protosw); |
3df80d93 ACM |
1145 | proto_unregister(&dccp_v6_prot); |
1146 | goto out; | |
1147 | } | |
1148 | ||
1149 | static void __exit dccp_v6_exit(void) | |
1150 | { | |
1151 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
a0f9a4c2 | 1152 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1153 | inet6_unregister_protosw(&dccp_v6_protosw); |
1154 | proto_unregister(&dccp_v6_prot); | |
1155 | } | |
1156 | ||
1157 | module_init(dccp_v6_init); | |
1158 | module_exit(dccp_v6_exit); | |
1159 | ||
1160 | /* | |
1161 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1162 | * values directly, Also cover the case where the protocol is not specified, | |
1163 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1164 | */ | |
7131c6c7 JD |
1165 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1166 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1167 | MODULE_LICENSE("GPL"); |
1168 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1169 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |