]>
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; |
1aa9d1a0 | 73 | const struct dccp_hdr *dh; |
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 | |
1aa9d1a0 ED |
81 | /* Only need dccph_dport & dccph_sport which are the first |
82 | * 4 bytes in dccp header. | |
83 | * Our caller (icmpv6_notify()) already pulled 8 bytes for us. | |
84 | */ | |
85 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
86 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
87 | dh = (struct dccp_hdr *)(skb->data + offset); | |
860239c5 | 88 | |
52036a43 ED |
89 | sk = __inet6_lookup_established(net, &dccp_hashinfo, |
90 | &hdr->daddr, dh->dccph_dport, | |
91 | &hdr->saddr, ntohs(dh->dccph_sport), | |
92 | inet6_iif(skb)); | |
3df80d93 | 93 | |
52036a43 | 94 | if (!sk) { |
a16292a0 ED |
95 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
96 | ICMP6_MIB_INERRORS); | |
3df80d93 ACM |
97 | return; |
98 | } | |
99 | ||
100 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 101 | inet_twsk_put(inet_twsk(sk)); |
3df80d93 ACM |
102 | return; |
103 | } | |
52036a43 ED |
104 | seq = dccp_hdr_seq(dh); |
105 | if (sk->sk_state == DCCP_NEW_SYN_RECV) | |
106 | return dccp_req_err(sk, seq); | |
3df80d93 ACM |
107 | |
108 | bh_lock_sock(sk); | |
109 | if (sock_owned_by_user(sk)) | |
02a1d6e7 | 110 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
3df80d93 ACM |
111 | |
112 | if (sk->sk_state == DCCP_CLOSED) | |
113 | goto out; | |
114 | ||
e0bcfb0c | 115 | dp = dccp_sk(sk); |
e0bcfb0c WY |
116 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
117 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { | |
02a1d6e7 | 118 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
e0bcfb0c WY |
119 | goto out; |
120 | } | |
121 | ||
3df80d93 ACM |
122 | np = inet6_sk(sk); |
123 | ||
ec18d9a2 | 124 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
125 | if (!sock_owned_by_user(sk)) { |
126 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 127 | |
45caeaa5 JM |
128 | if (dst) |
129 | dst->ops->redirect(dst, sk, skb); | |
130 | } | |
bd784a14 | 131 | goto out; |
ec18d9a2 DM |
132 | } |
133 | ||
3df80d93 | 134 | if (type == ICMPV6_PKT_TOOBIG) { |
3df80d93 ACM |
135 | struct dst_entry *dst = NULL; |
136 | ||
93b36cf3 HFS |
137 | if (!ip6_sk_accept_pmtu(sk)) |
138 | goto out; | |
139 | ||
3df80d93 ACM |
140 | if (sock_owned_by_user(sk)) |
141 | goto out; | |
142 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) | |
143 | goto out; | |
144 | ||
35ad9b9c DM |
145 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
146 | if (!dst) | |
147 | goto out; | |
148 | ||
149 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) | |
3df80d93 | 150 | dccp_sync_mss(sk, dst_mtu(dst)); |
3df80d93 ACM |
151 | goto out; |
152 | } | |
153 | ||
154 | icmpv6_err_convert(type, code, &err); | |
155 | ||
3df80d93 ACM |
156 | /* Might be for an request_sock */ |
157 | switch (sk->sk_state) { | |
3df80d93 ACM |
158 | case DCCP_REQUESTING: |
159 | case DCCP_RESPOND: /* Cannot happen. | |
45329e71 | 160 | It can, it SYNs are crossed. --ANK */ |
3df80d93 | 161 | if (!sock_owned_by_user(sk)) { |
aa62d76b | 162 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
163 | sk->sk_err = err; |
164 | /* | |
165 | * Wake people up to see the error | |
166 | * (see connect in sock.c) | |
167 | */ | |
168 | sk->sk_error_report(sk); | |
3df80d93 ACM |
169 | dccp_done(sk); |
170 | } else | |
171 | sk->sk_err_soft = err; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | if (!sock_owned_by_user(sk) && np->recverr) { | |
176 | sk->sk_err = err; | |
177 | sk->sk_error_report(sk); | |
178 | } else | |
179 | sk->sk_err_soft = err; | |
180 | ||
181 | out: | |
182 | bh_unlock_sock(sk); | |
183 | sock_put(sk); | |
184 | } | |
185 | ||
186 | ||
ea3bea3a | 187 | static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
3df80d93 | 188 | { |
634fb979 | 189 | struct inet_request_sock *ireq = inet_rsk(req); |
3df80d93 ACM |
190 | struct ipv6_pinfo *np = inet6_sk(sk); |
191 | struct sk_buff *skb; | |
20c59de2 | 192 | struct in6_addr *final_p, final; |
4c9483b2 | 193 | struct flowi6 fl6; |
3df80d93 | 194 | int err = -1; |
fd80eb94 | 195 | struct dst_entry *dst; |
3df80d93 | 196 | |
4c9483b2 DM |
197 | memset(&fl6, 0, sizeof(fl6)); |
198 | fl6.flowi6_proto = IPPROTO_DCCP; | |
634fb979 ED |
199 | fl6.daddr = ireq->ir_v6_rmt_addr; |
200 | fl6.saddr = ireq->ir_v6_loc_addr; | |
4c9483b2 | 201 | fl6.flowlabel = 0; |
634fb979 ED |
202 | fl6.flowi6_oif = ireq->ir_iif; |
203 | fl6.fl6_dport = ireq->ir_rmt_port; | |
b44084c2 | 204 | fl6.fl6_sport = htons(ireq->ir_num); |
4c9483b2 | 205 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
3df80d93 | 206 | |
3df80d93 | 207 | |
45f6fad8 ED |
208 | rcu_read_lock(); |
209 | final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); | |
210 | rcu_read_unlock(); | |
3df80d93 | 211 | |
0e0d44ab | 212 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
213 | if (IS_ERR(dst)) { |
214 | err = PTR_ERR(dst); | |
215 | dst = NULL; | |
fd80eb94 | 216 | goto done; |
68d0c6d3 | 217 | } |
3df80d93 ACM |
218 | |
219 | skb = dccp_make_response(sk, dst, req); | |
220 | if (skb != NULL) { | |
221 | struct dccp_hdr *dh = dccp_hdr(skb); | |
56ac42bc | 222 | struct ipv6_txoptions *opt; |
45329e71 | 223 | |
6f4e5fff | 224 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
634fb979 ED |
225 | &ireq->ir_v6_loc_addr, |
226 | &ireq->ir_v6_rmt_addr); | |
227 | fl6.daddr = ireq->ir_v6_rmt_addr; | |
45f6fad8 | 228 | rcu_read_lock(); |
56ac42bc HD |
229 | opt = ireq->ipv6_opt; |
230 | if (!opt) | |
231 | opt = rcu_dereference(np->opt); | |
92e55f41 | 232 | err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass); |
45f6fad8 | 233 | rcu_read_unlock(); |
b9df3cb8 | 234 | err = net_xmit_eval(err); |
3df80d93 ACM |
235 | } |
236 | ||
237 | done: | |
0cbd7825 | 238 | dst_release(dst); |
3df80d93 ACM |
239 | return err; |
240 | } | |
241 | ||
242 | static void dccp_v6_reqsk_destructor(struct request_sock *req) | |
243 | { | |
d99a7bd2 | 244 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
56ac42bc | 245 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 246 | kfree_skb(inet_rsk(req)->pktopts); |
3df80d93 ACM |
247 | } |
248 | ||
a00e7444 | 249 | static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
3df80d93 | 250 | { |
b71d1d42 | 251 | const struct ipv6hdr *rxip6h; |
3df80d93 | 252 | struct sk_buff *skb; |
4c9483b2 | 253 | struct flowi6 fl6; |
adf30907 | 254 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
334527d3 | 255 | struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
adf30907 | 256 | struct dst_entry *dst; |
3df80d93 | 257 | |
e356d37a | 258 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
3df80d93 ACM |
259 | return; |
260 | ||
261 | if (!ipv6_unicast_destination(rxskb)) | |
45329e71 | 262 | return; |
3df80d93 | 263 | |
02047741 | 264 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
45329e71 | 265 | if (skb == NULL) |
8109b02b | 266 | return; |
3df80d93 | 267 | |
0660e03f | 268 | rxip6h = ipv6_hdr(rxskb); |
e356d37a GR |
269 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
270 | &rxip6h->daddr); | |
6f4e5fff | 271 | |
4c9483b2 | 272 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
273 | fl6.daddr = rxip6h->saddr; |
274 | fl6.saddr = rxip6h->daddr; | |
6f4e5fff | 275 | |
4c9483b2 DM |
276 | fl6.flowi6_proto = IPPROTO_DCCP; |
277 | fl6.flowi6_oif = inet6_iif(rxskb); | |
1958b856 DM |
278 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
279 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; | |
4c9483b2 | 280 | security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6)); |
3df80d93 ACM |
281 | |
282 | /* sk = NULL, but it is safe for now. RST socket required. */ | |
0e0d44ab | 283 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
284 | if (!IS_ERR(dst)) { |
285 | skb_dst_set(skb, dst); | |
92e55f41 | 286 | ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0); |
7309f882 ED |
287 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
288 | DCCP_INC_STATS(DCCP_MIB_OUTRSTS); | |
68d0c6d3 | 289 | return; |
3df80d93 ACM |
290 | } |
291 | ||
292 | kfree_skb(skb); | |
293 | } | |
294 | ||
73c9e02c GR |
295 | static struct request_sock_ops dccp6_request_sock_ops = { |
296 | .family = AF_INET6, | |
297 | .obj_size = sizeof(struct dccp6_request_sock), | |
298 | .rtx_syn_ack = dccp_v6_send_response, | |
299 | .send_ack = dccp_reqsk_send_ack, | |
300 | .destructor = dccp_v6_reqsk_destructor, | |
301 | .send_reset = dccp_v6_ctl_send_reset, | |
c72e1183 | 302 | .syn_ack_timeout = dccp_syn_ack_timeout, |
73c9e02c GR |
303 | }; |
304 | ||
3df80d93 ACM |
305 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
306 | { | |
3df80d93 ACM |
307 | struct request_sock *req; |
308 | struct dccp_request_sock *dreq; | |
634fb979 | 309 | struct inet_request_sock *ireq; |
3df80d93 | 310 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 311 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 312 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
313 | |
314 | if (skb->protocol == htons(ETH_P_IP)) | |
315 | return dccp_v4_conn_request(sk, skb); | |
316 | ||
317 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 318 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
319 | |
320 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 321 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 322 | goto drop; |
8109b02b | 323 | } |
3df80d93 | 324 | /* |
45329e71 | 325 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 326 | */ |
4a5409a5 | 327 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 328 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 329 | goto drop; |
3df80d93 | 330 | |
5ea8ea2c | 331 | if (sk_acceptq_is_full(sk)) |
3df80d93 ACM |
332 | goto drop; |
333 | ||
a1a5344d | 334 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
3df80d93 ACM |
335 | if (req == NULL) |
336 | goto drop; | |
337 | ||
ac75773c GR |
338 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
339 | goto drop_and_free; | |
3df80d93 | 340 | |
8b819412 GR |
341 | dreq = dccp_rsk(req); |
342 | if (dccp_parse_options(sk, dreq, skb)) | |
343 | goto drop_and_free; | |
344 | ||
4237c75c VY |
345 | if (security_inet_conn_request(sk, skb, req)) |
346 | goto drop_and_free; | |
347 | ||
634fb979 ED |
348 | ireq = inet_rsk(req); |
349 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
350 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 351 | ireq->ireq_family = AF_INET6; |
3df80d93 | 352 | |
a224772d | 353 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
354 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
355 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
63354797 | 356 | refcount_inc(&skb->users); |
634fb979 | 357 | ireq->pktopts = skb; |
3df80d93 | 358 | } |
634fb979 | 359 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
360 | |
361 | /* So that link locals have meaning */ | |
362 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
363 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
364 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 365 | |
45329e71 | 366 | /* |
3df80d93 ACM |
367 | * Step 3: Process LISTEN state |
368 | * | |
d83ca5ac | 369 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 370 | * |
f541fb7e | 371 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 372 | */ |
3df80d93 | 373 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 374 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 375 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 376 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
377 | dreq->dreq_service = service; |
378 | ||
1a2c6181 | 379 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
380 | goto drop_and_free; |
381 | ||
079096f1 | 382 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
0c2232b0 | 383 | reqsk_put(req); |
3df80d93 ACM |
384 | return 0; |
385 | ||
386 | drop_and_free: | |
387 | reqsk_free(req); | |
388 | drop: | |
aa62d76b | 389 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
3df80d93 ACM |
390 | return -1; |
391 | } | |
392 | ||
0c27171e | 393 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
3df80d93 ACM |
394 | struct sk_buff *skb, |
395 | struct request_sock *req, | |
5e0724d0 ED |
396 | struct dst_entry *dst, |
397 | struct request_sock *req_unhash, | |
398 | bool *own_req) | |
3df80d93 | 399 | { |
634fb979 | 400 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
401 | struct ipv6_pinfo *newnp; |
402 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 403 | struct ipv6_txoptions *opt; |
3df80d93 | 404 | struct inet_sock *newinet; |
3df80d93 ACM |
405 | struct dccp6_sock *newdp6; |
406 | struct sock *newsk; | |
3df80d93 ACM |
407 | |
408 | if (skb->protocol == htons(ETH_P_IP)) { | |
409 | /* | |
410 | * v6 mapped | |
411 | */ | |
5e0724d0 ED |
412 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
413 | req_unhash, own_req); | |
45329e71 | 414 | if (newsk == NULL) |
3df80d93 ACM |
415 | return NULL; |
416 | ||
417 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
418 | newinet = inet_sk(newsk); |
419 | newinet->pinet6 = &newdp6->inet6; | |
420 | newnp = inet6_sk(newsk); | |
421 | ||
422 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
423 | ||
d1e559d0 | 424 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
425 | |
426 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
427 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
428 | newnp->pktoptions = NULL; | |
429 | newnp->opt = NULL; | |
83eaddab WC |
430 | newnp->ipv6_mc_list = NULL; |
431 | newnp->ipv6_ac_list = NULL; | |
432 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 433 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 434 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
435 | |
436 | /* | |
437 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
438 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
439 | * that function for the gory details. -acme | |
440 | */ | |
441 | ||
442 | /* It is tricky place. Until this moment IPv4 tcp | |
443 | worked with IPv6 icsk.icsk_af_ops. | |
444 | Sync it now. | |
445 | */ | |
d83d8461 | 446 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
447 | |
448 | return newsk; | |
449 | } | |
450 | ||
3df80d93 ACM |
451 | |
452 | if (sk_acceptq_is_full(sk)) | |
453 | goto out_overflow; | |
454 | ||
f76b33c3 | 455 | if (!dst) { |
4c9483b2 DM |
456 | struct flowi6 fl6; |
457 | ||
f76b33c3 ED |
458 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
459 | if (!dst) | |
3df80d93 | 460 | goto out; |
45329e71 | 461 | } |
3df80d93 ACM |
462 | |
463 | newsk = dccp_create_openreq_child(sk, req, skb); | |
464 | if (newsk == NULL) | |
093d2823 | 465 | goto out_nonewsk; |
3df80d93 ACM |
466 | |
467 | /* | |
468 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
469 | * count here, dccp_create_openreq_child now does this for us, see the | |
470 | * comment in that function for the gory details. -acme | |
471 | */ | |
472 | ||
6bd4f355 | 473 | ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
474 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
475 | NETIF_F_TSO); | |
3df80d93 ACM |
476 | newdp6 = (struct dccp6_sock *)newsk; |
477 | newinet = inet_sk(newsk); | |
478 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
479 | newnp = inet6_sk(newsk); |
480 | ||
481 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
482 | ||
634fb979 ED |
483 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
484 | newnp->saddr = ireq->ir_v6_loc_addr; | |
485 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
486 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 487 | |
45329e71 | 488 | /* Now IPv6 options... |
3df80d93 ACM |
489 | |
490 | First: no IPv4 options. | |
491 | */ | |
f6d8bd05 | 492 | newinet->inet_opt = NULL; |
3df80d93 ACM |
493 | |
494 | /* Clone RX bits */ | |
495 | newnp->rxopt.all = np->rxopt.all; | |
496 | ||
83eaddab WC |
497 | newnp->ipv6_mc_list = NULL; |
498 | newnp->ipv6_ac_list = NULL; | |
499 | newnp->ipv6_fl_list = NULL; | |
3df80d93 | 500 | newnp->pktoptions = NULL; |
3df80d93 ACM |
501 | newnp->opt = NULL; |
502 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 503 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 504 | |
45329e71 ACM |
505 | /* |
506 | * Clone native IPv6 options from listening socket (if any) | |
507 | * | |
508 | * Yes, keeping reference count would be much more clever, but we make | |
509 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 510 | */ |
56ac42bc HD |
511 | opt = ireq->ipv6_opt; |
512 | if (!opt) | |
513 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
514 | if (opt) { |
515 | opt = ipv6_dup_options(newsk, opt); | |
516 | RCU_INIT_POINTER(newnp->opt, opt); | |
517 | } | |
d83d8461 | 518 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
519 | if (opt) |
520 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
521 | opt->opt_flen; | |
3df80d93 ACM |
522 | |
523 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
524 | ||
c720c7e8 ED |
525 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
526 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 527 | |
093d2823 | 528 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
529 | inet_csk_prepare_forced_close(newsk); |
530 | dccp_done(newsk); | |
093d2823 BS |
531 | goto out; |
532 | } | |
5e0724d0 | 533 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
ce105008 ED |
534 | /* Clone pktoptions received with SYN, if we own the req */ |
535 | if (*own_req && ireq->pktopts) { | |
536 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
537 | consume_skb(ireq->pktopts); | |
538 | ireq->pktopts = NULL; | |
539 | if (newnp->pktoptions) | |
540 | skb_set_owner_r(newnp->pktoptions, newsk); | |
541 | } | |
3df80d93 ACM |
542 | |
543 | return newsk; | |
544 | ||
545 | out_overflow: | |
02a1d6e7 | 546 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
547 | out_nonewsk: |
548 | dst_release(dst); | |
3df80d93 | 549 | out: |
02a1d6e7 | 550 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
551 | return NULL; |
552 | } | |
553 | ||
554 | /* The socket must have it's spinlock held when we get | |
555 | * here. | |
556 | * | |
557 | * We have a potential double-lock case here, so even when | |
558 | * doing backlog processing we use the BH locking scheme. | |
559 | * This is because we cannot sleep with the original spinlock | |
560 | * held. | |
561 | */ | |
562 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
563 | { | |
564 | struct ipv6_pinfo *np = inet6_sk(sk); | |
565 | struct sk_buff *opt_skb = NULL; | |
566 | ||
567 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
568 | goes to IPv4 receive handler and backlogged. | |
569 | From backlog it always goes here. Kerboom... | |
570 | Fortunately, dccp_rcv_established and rcv_established | |
571 | handle them correctly, but it is not case with | |
572 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
573 | */ | |
574 | ||
575 | if (skb->protocol == htons(ETH_P_IP)) | |
576 | return dccp_v4_do_rcv(sk, skb); | |
577 | ||
fda9ef5d | 578 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
579 | goto discard; |
580 | ||
581 | /* | |
45329e71 ACM |
582 | * socket locking is here for SMP purposes as backlog rcv is currently |
583 | * called with bh processing disabled. | |
3df80d93 ACM |
584 | */ |
585 | ||
586 | /* Do Stevens' IPV6_PKTOPTIONS. | |
587 | ||
588 | Yes, guys, it is the only place in our code, where we | |
589 | may make it not affecting IPv4. | |
590 | The rest of code is protocol independent, | |
591 | and I do not like idea to uglify IPv4. | |
592 | ||
593 | Actually, all the idea behind IPV6_PKTOPTIONS | |
594 | looks not very well thought. For now we latch | |
595 | options, received in the last packet, enqueued | |
596 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 597 | --ANK (980728) |
3df80d93 ACM |
598 | */ |
599 | if (np->rxopt.all) | |
89e7e577 GR |
600 | /* |
601 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
602 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
603 | */ | |
3df80d93 ACM |
604 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
605 | ||
606 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
607 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
608 | goto reset; | |
fd169f15 | 609 | if (opt_skb) { |
89e7e577 | 610 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
611 | __kfree_skb(opt_skb); |
612 | } | |
3df80d93 ACM |
613 | return 0; |
614 | } | |
615 | ||
d83ca5ac GR |
616 | /* |
617 | * Step 3: Process LISTEN state | |
618 | * If S.state == LISTEN, | |
619 | * If P.type == Request or P contains a valid Init Cookie option, | |
620 | * (* Must scan the packet's options to check for Init | |
621 | * Cookies. Only Init Cookies are processed here, | |
622 | * however; other options are processed in Step 8. This | |
623 | * scan need only be performed if the endpoint uses Init | |
624 | * Cookies *) | |
625 | * (* Generate a new socket and switch to that socket *) | |
626 | * Set S := new socket for this port pair | |
627 | * S.state = RESPOND | |
628 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
629 | * Initialize S.GAR := S.ISS | |
630 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
631 | * Continue with S.state == RESPOND | |
632 | * (* A Response packet will be generated in Step 11 *) | |
633 | * Otherwise, | |
634 | * Generate Reset(No Connection) unless P.type == Reset | |
635 | * Drop packet and return | |
636 | * | |
637 | * NOTE: the check for the packet types is done in | |
638 | * dccp_rcv_state_process | |
639 | */ | |
3df80d93 ACM |
640 | |
641 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
642 | goto reset; | |
fd169f15 | 643 | if (opt_skb) { |
89e7e577 | 644 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
645 | __kfree_skb(opt_skb); |
646 | } | |
3df80d93 ACM |
647 | return 0; |
648 | ||
649 | reset: | |
cfb6eeb4 | 650 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 651 | discard: |
45329e71 | 652 | if (opt_skb != NULL) |
3df80d93 ACM |
653 | __kfree_skb(opt_skb); |
654 | kfree_skb(skb); | |
655 | return 0; | |
656 | } | |
657 | ||
e5bbef20 | 658 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
659 | { |
660 | const struct dccp_hdr *dh; | |
3b24d854 | 661 | bool refcounted; |
3df80d93 | 662 | struct sock *sk; |
6f4e5fff | 663 | int min_cov; |
3df80d93 | 664 | |
6f4e5fff | 665 | /* Step 1: Check header basics */ |
3df80d93 ACM |
666 | |
667 | if (dccp_invalid_packet(skb)) | |
668 | goto discard_it; | |
669 | ||
6f4e5fff | 670 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
671 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
672 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 673 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
674 | goto discard_it; |
675 | } | |
676 | ||
3df80d93 ACM |
677 | dh = dccp_hdr(skb); |
678 | ||
fde20105 | 679 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
680 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
681 | ||
682 | if (dccp_packet_without_ack(skb)) | |
683 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
684 | else | |
685 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
686 | ||
4bdc3d66 | 687 | lookup: |
a583636a | 688 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh), |
870c3151 | 689 | dh->dccph_sport, dh->dccph_dport, |
3b24d854 | 690 | inet6_iif(skb), &refcounted); |
4bdc3d66 | 691 | if (!sk) { |
d23c7107 GR |
692 | dccp_pr_debug("failed to look up flow ID in table and " |
693 | "get corresponding socket\n"); | |
3df80d93 | 694 | goto no_dccp_socket; |
d23c7107 | 695 | } |
3df80d93 | 696 | |
45329e71 | 697 | /* |
3df80d93 | 698 | * Step 2: |
8109b02b | 699 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
700 | * Generate Reset(No Connection) unless P.type == Reset |
701 | * Drop packet and return | |
702 | */ | |
d23c7107 GR |
703 | if (sk->sk_state == DCCP_TIME_WAIT) { |
704 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
705 | inet_twsk_put(inet_twsk(sk)); | |
706 | goto no_dccp_socket; | |
707 | } | |
3df80d93 | 708 | |
079096f1 ED |
709 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
710 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 711 | struct sock *nsk; |
079096f1 ED |
712 | |
713 | sk = req->rsk_listener; | |
7716682c | 714 | if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
f03f2e15 | 715 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
716 | goto lookup; |
717 | } | |
7716682c | 718 | sock_hold(sk); |
3b24d854 | 719 | refcounted = true; |
7716682c | 720 | nsk = dccp_check_req(sk, skb, req); |
079096f1 ED |
721 | if (!nsk) { |
722 | reqsk_put(req); | |
7716682c | 723 | goto discard_and_relse; |
079096f1 ED |
724 | } |
725 | if (nsk == sk) { | |
079096f1 ED |
726 | reqsk_put(req); |
727 | } else if (dccp_child_process(sk, nsk, skb)) { | |
728 | dccp_v6_ctl_send_reset(sk, skb); | |
7716682c | 729 | goto discard_and_relse; |
079096f1 | 730 | } else { |
7716682c | 731 | sock_put(sk); |
079096f1 ED |
732 | return 0; |
733 | } | |
734 | } | |
6f4e5fff GR |
735 | /* |
736 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
737 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
738 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
739 | */ |
740 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
741 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
742 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
743 | dh->dccph_cscov, min_cov); | |
744 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
745 | goto discard_and_relse; | |
746 | } | |
747 | ||
3df80d93 ACM |
748 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
749 | goto discard_and_relse; | |
750 | ||
c3f24cfb ED |
751 | return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, |
752 | refcounted) ? -1 : 0; | |
3df80d93 ACM |
753 | |
754 | no_dccp_socket: | |
755 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
756 | goto discard_it; | |
757 | /* | |
758 | * Step 2: | |
8109b02b | 759 | * If no socket ... |
3df80d93 ACM |
760 | * Generate Reset(No Connection) unless P.type == Reset |
761 | * Drop packet and return | |
762 | */ | |
763 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
764 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
765 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 766 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 767 | } |
3df80d93 | 768 | |
d23c7107 | 769 | discard_it: |
3df80d93 ACM |
770 | kfree_skb(skb); |
771 | return 0; | |
772 | ||
773 | discard_and_relse: | |
3b24d854 ED |
774 | if (refcounted) |
775 | sock_put(sk); | |
3df80d93 | 776 | goto discard_it; |
3df80d93 ACM |
777 | } |
778 | ||
73c9e02c GR |
779 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
780 | int addr_len) | |
781 | { | |
782 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
783 | struct inet_connection_sock *icsk = inet_csk(sk); | |
784 | struct inet_sock *inet = inet_sk(sk); | |
785 | struct ipv6_pinfo *np = inet6_sk(sk); | |
786 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 787 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 788 | struct ipv6_txoptions *opt; |
4c9483b2 | 789 | struct flowi6 fl6; |
73c9e02c GR |
790 | struct dst_entry *dst; |
791 | int addr_type; | |
792 | int err; | |
793 | ||
794 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
795 | ||
796 | if (addr_len < SIN6_LEN_RFC2133) | |
797 | return -EINVAL; | |
798 | ||
799 | if (usin->sin6_family != AF_INET6) | |
800 | return -EAFNOSUPPORT; | |
801 | ||
4c9483b2 | 802 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
803 | |
804 | if (np->sndflow) { | |
4c9483b2 DM |
805 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
806 | IP6_ECN_flow_init(fl6.flowlabel); | |
807 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 808 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 809 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
810 | if (flowlabel == NULL) |
811 | return -EINVAL; | |
73c9e02c GR |
812 | fl6_sock_release(flowlabel); |
813 | } | |
814 | } | |
815 | /* | |
816 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
817 | */ | |
818 | if (ipv6_addr_any(&usin->sin6_addr)) | |
819 | usin->sin6_addr.s6_addr[15] = 1; | |
820 | ||
821 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
822 | ||
823 | if (addr_type & IPV6_ADDR_MULTICAST) | |
824 | return -ENETUNREACH; | |
825 | ||
826 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
827 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
828 | usin->sin6_scope_id) { | |
829 | /* If interface is set while binding, indices | |
830 | * must coincide. | |
831 | */ | |
832 | if (sk->sk_bound_dev_if && | |
833 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
834 | return -EINVAL; | |
835 | ||
836 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
837 | } | |
838 | ||
839 | /* Connect to link-local address requires an interface */ | |
840 | if (!sk->sk_bound_dev_if) | |
841 | return -EINVAL; | |
842 | } | |
843 | ||
efe4208f | 844 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 845 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
846 | |
847 | /* | |
848 | * DCCP over IPv4 | |
849 | */ | |
850 | if (addr_type == IPV6_ADDR_MAPPED) { | |
851 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
852 | struct sockaddr_in sin; | |
853 | ||
854 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
855 | ||
856 | if (__ipv6_only_sock(sk)) | |
857 | return -ENETUNREACH; | |
858 | ||
859 | sin.sin_family = AF_INET; | |
860 | sin.sin_port = usin->sin6_port; | |
861 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
862 | ||
863 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
864 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
865 | ||
866 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
867 | if (err) { | |
868 | icsk->icsk_ext_hdr_len = exthdrlen; | |
869 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
870 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
871 | goto failure; | |
73c9e02c | 872 | } |
d1e559d0 | 873 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
874 | return err; |
875 | } | |
876 | ||
efe4208f ED |
877 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
878 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 879 | |
4c9483b2 | 880 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 881 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 882 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 883 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
884 | fl6.fl6_dport = usin->sin6_port; |
885 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 886 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 887 | |
1e1d04e6 | 888 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 889 | final_p = fl6_update_dst(&fl6, opt, &final); |
73c9e02c | 890 | |
0e0d44ab | 891 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
892 | if (IS_ERR(dst)) { |
893 | err = PTR_ERR(dst); | |
73c9e02c | 894 | goto failure; |
14e50e57 | 895 | } |
73c9e02c GR |
896 | |
897 | if (saddr == NULL) { | |
4c9483b2 | 898 | saddr = &fl6.saddr; |
efe4208f | 899 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
900 | } |
901 | ||
902 | /* set the source address */ | |
4e3fd7a0 | 903 | np->saddr = *saddr; |
c720c7e8 | 904 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c | 905 | |
6bd4f355 | 906 | ip6_dst_store(sk, dst, NULL, NULL); |
73c9e02c GR |
907 | |
908 | icsk->icsk_ext_hdr_len = 0; | |
45f6fad8 ED |
909 | if (opt) |
910 | icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; | |
73c9e02c | 911 | |
c720c7e8 | 912 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
913 | |
914 | dccp_set_state(sk, DCCP_REQUESTING); | |
915 | err = inet6_hash_connect(&dccp_death_row, sk); | |
916 | if (err) | |
917 | goto late_failure; | |
d7f7365f GR |
918 | |
919 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 920 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
921 | inet->inet_sport, |
922 | inet->inet_dport); | |
73c9e02c GR |
923 | err = dccp_connect(sk); |
924 | if (err) | |
925 | goto late_failure; | |
926 | ||
927 | return 0; | |
928 | ||
929 | late_failure: | |
930 | dccp_set_state(sk, DCCP_CLOSED); | |
931 | __sk_dst_reset(sk); | |
932 | failure: | |
c720c7e8 | 933 | inet->inet_dport = 0; |
73c9e02c GR |
934 | sk->sk_route_caps = 0; |
935 | return err; | |
936 | } | |
937 | ||
3b401a81 | 938 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
939 | .queue_xmit = inet6_csk_xmit, |
940 | .send_check = dccp_v6_send_check, | |
941 | .rebuild_header = inet6_sk_rebuild_header, | |
942 | .conn_request = dccp_v6_conn_request, | |
943 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
944 | .net_header_len = sizeof(struct ipv6hdr), | |
945 | .setsockopt = ipv6_setsockopt, | |
946 | .getsockopt = ipv6_getsockopt, | |
947 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
948 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 949 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
950 | .compat_setsockopt = compat_ipv6_setsockopt, |
951 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 952 | #endif |
3df80d93 ACM |
953 | }; |
954 | ||
955 | /* | |
956 | * DCCP over IPv4 via INET6 API | |
957 | */ | |
3b401a81 | 958 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
959 | .queue_xmit = ip_queue_xmit, |
960 | .send_check = dccp_v4_send_check, | |
961 | .rebuild_header = inet_sk_rebuild_header, | |
962 | .conn_request = dccp_v6_conn_request, | |
963 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
964 | .net_header_len = sizeof(struct iphdr), | |
965 | .setsockopt = ipv6_setsockopt, | |
966 | .getsockopt = ipv6_getsockopt, | |
967 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
968 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 969 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
970 | .compat_setsockopt = compat_ipv6_setsockopt, |
971 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 972 | #endif |
3df80d93 ACM |
973 | }; |
974 | ||
975 | /* NOTE: A lot of things set to zero explicitly by call to | |
976 | * sk_alloc() so need not be done here. | |
977 | */ | |
978 | static int dccp_v6_init_sock(struct sock *sk) | |
979 | { | |
72478873 ACM |
980 | static __u8 dccp_v6_ctl_sock_initialized; |
981 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 982 | |
72478873 ACM |
983 | if (err == 0) { |
984 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
985 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 986 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 987 | } |
3df80d93 ACM |
988 | |
989 | return err; | |
990 | } | |
991 | ||
7d06b2e0 | 992 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 993 | { |
3e0fadc5 | 994 | dccp_destroy_sock(sk); |
7d06b2e0 | 995 | inet6_destroy_sock(sk); |
3df80d93 ACM |
996 | } |
997 | ||
73c9e02c GR |
998 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
999 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
1000 | }; | |
1001 | ||
3df80d93 | 1002 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
1003 | .name = "DCCPv6", |
1004 | .owner = THIS_MODULE, | |
1005 | .close = dccp_close, | |
1006 | .connect = dccp_v6_connect, | |
1007 | .disconnect = dccp_disconnect, | |
1008 | .ioctl = dccp_ioctl, | |
1009 | .init = dccp_v6_init_sock, | |
1010 | .setsockopt = dccp_setsockopt, | |
1011 | .getsockopt = dccp_getsockopt, | |
1012 | .sendmsg = dccp_sendmsg, | |
1013 | .recvmsg = dccp_recvmsg, | |
1014 | .backlog_rcv = dccp_v6_do_rcv, | |
496611d7 | 1015 | .hash = inet6_hash, |
ab1e0a13 | 1016 | .unhash = inet_unhash, |
543d9cfe | 1017 | .accept = inet_csk_accept, |
ab1e0a13 | 1018 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
1019 | .shutdown = dccp_shutdown, |
1020 | .destroy = dccp_v6_destroy_sock, | |
1021 | .orphan_count = &dccp_orphan_count, | |
1022 | .max_header = MAX_DCCP_HEADER, | |
1023 | .obj_size = sizeof(struct dccp6_sock), | |
5f0d5a3a | 1024 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
543d9cfe ACM |
1025 | .rsk_prot = &dccp6_request_sock_ops, |
1026 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 1027 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1028 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1029 | .compat_setsockopt = compat_dccp_setsockopt, |
1030 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1031 | #endif |
3df80d93 ACM |
1032 | }; |
1033 | ||
41135cc8 | 1034 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1035 | .handler = dccp_v6_rcv, |
1036 | .err_handler = dccp_v6_err, | |
1037 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1038 | }; |
1039 | ||
5708e868 | 1040 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1041 | .family = PF_INET6, |
1042 | .owner = THIS_MODULE, | |
1043 | .release = inet6_release, | |
1044 | .bind = inet6_bind, | |
1045 | .connect = inet_stream_connect, | |
1046 | .socketpair = sock_no_socketpair, | |
1047 | .accept = inet_accept, | |
1048 | .getname = inet6_getname, | |
1049 | .poll = dccp_poll, | |
1050 | .ioctl = inet6_ioctl, | |
1051 | .listen = inet_dccp_listen, | |
1052 | .shutdown = inet_shutdown, | |
1053 | .setsockopt = sock_common_setsockopt, | |
1054 | .getsockopt = sock_common_getsockopt, | |
1055 | .sendmsg = inet_sendmsg, | |
1056 | .recvmsg = sock_common_recvmsg, | |
1057 | .mmap = sock_no_mmap, | |
1058 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1059 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1060 | .compat_setsockopt = compat_sock_common_setsockopt, |
1061 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1062 | #endif |
3df80d93 ACM |
1063 | }; |
1064 | ||
1065 | static struct inet_protosw dccp_v6_protosw = { | |
1066 | .type = SOCK_DCCP, | |
1067 | .protocol = IPPROTO_DCCP, | |
1068 | .prot = &dccp_v6_prot, | |
1069 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1070 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1071 | }; |
1072 | ||
2c8c1e72 | 1073 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1074 | { |
d14a0ebd GR |
1075 | if (dccp_hashinfo.bhash == NULL) |
1076 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1077 | |
d14a0ebd GR |
1078 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1079 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1080 | } |
1081 | ||
2c8c1e72 | 1082 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1083 | { |
334527d3 | 1084 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1085 | } |
1086 | ||
ec7cb62d AR |
1087 | static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
1088 | { | |
1089 | inet_twsk_purge(&dccp_hashinfo, AF_INET6); | |
1090 | } | |
1091 | ||
8231bd27 PE |
1092 | static struct pernet_operations dccp_v6_ops = { |
1093 | .init = dccp_v6_init_net, | |
1094 | .exit = dccp_v6_exit_net, | |
ec7cb62d | 1095 | .exit_batch = dccp_v6_exit_batch, |
8231bd27 PE |
1096 | }; |
1097 | ||
3df80d93 ACM |
1098 | static int __init dccp_v6_init(void) |
1099 | { | |
1100 | int err = proto_register(&dccp_v6_prot, 1); | |
1101 | ||
a0f9a4c2 | 1102 | if (err) |
3df80d93 ACM |
1103 | goto out; |
1104 | ||
3df80d93 | 1105 | inet6_register_protosw(&dccp_v6_protosw); |
72478873 | 1106 | |
8231bd27 | 1107 | err = register_pernet_subsys(&dccp_v6_ops); |
a0f9a4c2 | 1108 | if (err) |
8231bd27 | 1109 | goto out_destroy_ctl_sock; |
a0f9a4c2 XL |
1110 | |
1111 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1112 | if (err) | |
1113 | goto out_unregister_proto; | |
1114 | ||
3df80d93 ACM |
1115 | out: |
1116 | return err; | |
a0f9a4c2 XL |
1117 | out_unregister_proto: |
1118 | unregister_pernet_subsys(&dccp_v6_ops); | |
8231bd27 | 1119 | out_destroy_ctl_sock: |
72478873 | 1120 | inet6_unregister_protosw(&dccp_v6_protosw); |
3df80d93 ACM |
1121 | proto_unregister(&dccp_v6_prot); |
1122 | goto out; | |
1123 | } | |
1124 | ||
1125 | static void __exit dccp_v6_exit(void) | |
1126 | { | |
1127 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
a0f9a4c2 | 1128 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1129 | inet6_unregister_protosw(&dccp_v6_protosw); |
1130 | proto_unregister(&dccp_v6_prot); | |
1131 | } | |
1132 | ||
1133 | module_init(dccp_v6_init); | |
1134 | module_exit(dccp_v6_exit); | |
1135 | ||
1136 | /* | |
1137 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1138 | * values directly, Also cover the case where the protocol is not specified, | |
1139 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1140 | */ | |
7131c6c7 JD |
1141 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1142 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1143 | MODULE_LICENSE("GPL"); |
1144 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1145 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |