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 | ||
ea3bea3a | 184 | static int dccp_v6_send_response(const 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 | ||
a00e7444 | 237 | static void dccp_v6_ctl_send_reset(const 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 int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
294 | { | |
3df80d93 ACM |
295 | struct request_sock *req; |
296 | struct dccp_request_sock *dreq; | |
634fb979 | 297 | struct inet_request_sock *ireq; |
3df80d93 | 298 | struct ipv6_pinfo *np = inet6_sk(sk); |
8109b02b | 299 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3df80d93 | 300 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3df80d93 ACM |
301 | |
302 | if (skb->protocol == htons(ETH_P_IP)) | |
303 | return dccp_v4_conn_request(sk, skb); | |
304 | ||
305 | if (!ipv6_unicast_destination(skb)) | |
4a5409a5 | 306 | return 0; /* discard, don't send a reset here */ |
3df80d93 ACM |
307 | |
308 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 309 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3df80d93 | 310 | goto drop; |
8109b02b | 311 | } |
3df80d93 | 312 | /* |
45329e71 | 313 | * There are no SYN attacks on IPv6, yet... |
3df80d93 | 314 | */ |
4a5409a5 | 315 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3df80d93 | 316 | if (inet_csk_reqsk_queue_is_full(sk)) |
45329e71 | 317 | goto drop; |
3df80d93 ACM |
318 | |
319 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
320 | goto drop; | |
321 | ||
a1a5344d | 322 | req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
3df80d93 ACM |
323 | if (req == NULL) |
324 | goto drop; | |
325 | ||
ac75773c GR |
326 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
327 | goto drop_and_free; | |
3df80d93 | 328 | |
8b819412 GR |
329 | dreq = dccp_rsk(req); |
330 | if (dccp_parse_options(sk, dreq, skb)) | |
331 | goto drop_and_free; | |
332 | ||
4237c75c VY |
333 | if (security_inet_conn_request(sk, skb, req)) |
334 | goto drop_and_free; | |
335 | ||
634fb979 ED |
336 | ireq = inet_rsk(req); |
337 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
338 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
3f66b083 | 339 | ireq->ireq_family = AF_INET6; |
3df80d93 | 340 | |
a224772d | 341 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
3df80d93 ACM |
342 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
343 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
344 | atomic_inc(&skb->users); | |
634fb979 | 345 | ireq->pktopts = skb; |
3df80d93 | 346 | } |
634fb979 | 347 | ireq->ir_iif = sk->sk_bound_dev_if; |
3df80d93 ACM |
348 | |
349 | /* So that link locals have meaning */ | |
350 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
351 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
352 | ireq->ir_iif = inet6_iif(skb); | |
3df80d93 | 353 | |
45329e71 | 354 | /* |
3df80d93 ACM |
355 | * Step 3: Process LISTEN state |
356 | * | |
d83ca5ac | 357 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
3df80d93 | 358 | * |
f541fb7e | 359 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3df80d93 | 360 | */ |
3df80d93 | 361 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 362 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 363 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
f541fb7e | 364 | dreq->dreq_gss = dreq->dreq_iss; |
3df80d93 ACM |
365 | dreq->dreq_service = service; |
366 | ||
1a2c6181 | 367 | if (dccp_v6_send_response(sk, req)) |
3df80d93 ACM |
368 | goto drop_and_free; |
369 | ||
079096f1 | 370 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
3df80d93 ACM |
371 | return 0; |
372 | ||
373 | drop_and_free: | |
374 | reqsk_free(req); | |
375 | drop: | |
376 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3df80d93 ACM |
377 | return -1; |
378 | } | |
379 | ||
0c27171e | 380 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
3df80d93 ACM |
381 | struct sk_buff *skb, |
382 | struct request_sock *req, | |
383 | struct dst_entry *dst) | |
384 | { | |
634fb979 | 385 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
386 | struct ipv6_pinfo *newnp; |
387 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
3df80d93 | 388 | struct inet_sock *newinet; |
3df80d93 ACM |
389 | struct dccp6_sock *newdp6; |
390 | struct sock *newsk; | |
3df80d93 ACM |
391 | |
392 | if (skb->protocol == htons(ETH_P_IP)) { | |
393 | /* | |
394 | * v6 mapped | |
395 | */ | |
3df80d93 | 396 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst); |
45329e71 | 397 | if (newsk == NULL) |
3df80d93 ACM |
398 | return NULL; |
399 | ||
400 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
401 | newinet = inet_sk(newsk); |
402 | newinet->pinet6 = &newdp6->inet6; | |
403 | newnp = inet6_sk(newsk); | |
404 | ||
405 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
406 | ||
d1e559d0 | 407 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
408 | |
409 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
410 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
411 | newnp->pktoptions = NULL; | |
412 | newnp->opt = NULL; | |
413 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 414 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
415 | |
416 | /* | |
417 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
418 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
419 | * that function for the gory details. -acme | |
420 | */ | |
421 | ||
422 | /* It is tricky place. Until this moment IPv4 tcp | |
423 | worked with IPv6 icsk.icsk_af_ops. | |
424 | Sync it now. | |
425 | */ | |
d83d8461 | 426 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
427 | |
428 | return newsk; | |
429 | } | |
430 | ||
3df80d93 ACM |
431 | |
432 | if (sk_acceptq_is_full(sk)) | |
433 | goto out_overflow; | |
434 | ||
f76b33c3 | 435 | if (!dst) { |
4c9483b2 DM |
436 | struct flowi6 fl6; |
437 | ||
f76b33c3 ED |
438 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
439 | if (!dst) | |
3df80d93 | 440 | goto out; |
45329e71 | 441 | } |
3df80d93 ACM |
442 | |
443 | newsk = dccp_create_openreq_child(sk, req, skb); | |
444 | if (newsk == NULL) | |
093d2823 | 445 | goto out_nonewsk; |
3df80d93 ACM |
446 | |
447 | /* | |
448 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
449 | * count here, dccp_create_openreq_child now does this for us, see the | |
450 | * comment in that function for the gory details. -acme | |
451 | */ | |
452 | ||
8e1ef0a9 | 453 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
454 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
455 | NETIF_F_TSO); | |
3df80d93 ACM |
456 | newdp6 = (struct dccp6_sock *)newsk; |
457 | newinet = inet_sk(newsk); | |
458 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
459 | newnp = inet6_sk(newsk); |
460 | ||
461 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
462 | ||
634fb979 ED |
463 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
464 | newnp->saddr = ireq->ir_v6_loc_addr; | |
465 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
466 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 467 | |
45329e71 | 468 | /* Now IPv6 options... |
3df80d93 ACM |
469 | |
470 | First: no IPv4 options. | |
471 | */ | |
f6d8bd05 | 472 | newinet->inet_opt = NULL; |
3df80d93 ACM |
473 | |
474 | /* Clone RX bits */ | |
475 | newnp->rxopt.all = np->rxopt.all; | |
476 | ||
477 | /* Clone pktoptions received with SYN */ | |
478 | newnp->pktoptions = NULL; | |
634fb979 ED |
479 | if (ireq->pktopts != NULL) { |
480 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
481 | consume_skb(ireq->pktopts); | |
482 | ireq->pktopts = NULL; | |
3df80d93 ACM |
483 | if (newnp->pktoptions) |
484 | skb_set_owner_r(newnp->pktoptions, newsk); | |
485 | } | |
486 | newnp->opt = NULL; | |
487 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 488 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 489 | |
45329e71 ACM |
490 | /* |
491 | * Clone native IPv6 options from listening socket (if any) | |
492 | * | |
493 | * Yes, keeping reference count would be much more clever, but we make | |
494 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 495 | */ |
0979e465 RL |
496 | if (np->opt != NULL) |
497 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 498 | |
d83d8461 | 499 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 500 | if (newnp->opt != NULL) |
d83d8461 ACM |
501 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
502 | newnp->opt->opt_flen); | |
3df80d93 ACM |
503 | |
504 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
505 | ||
c720c7e8 ED |
506 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
507 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 508 | |
093d2823 | 509 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
510 | inet_csk_prepare_forced_close(newsk); |
511 | dccp_done(newsk); | |
093d2823 BS |
512 | goto out; |
513 | } | |
77a6a471 | 514 | __inet_hash(newsk, NULL); |
3df80d93 ACM |
515 | |
516 | return newsk; | |
517 | ||
518 | out_overflow: | |
de0744af | 519 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
520 | out_nonewsk: |
521 | dst_release(dst); | |
3df80d93 | 522 | out: |
de0744af | 523 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
524 | return NULL; |
525 | } | |
526 | ||
527 | /* The socket must have it's spinlock held when we get | |
528 | * here. | |
529 | * | |
530 | * We have a potential double-lock case here, so even when | |
531 | * doing backlog processing we use the BH locking scheme. | |
532 | * This is because we cannot sleep with the original spinlock | |
533 | * held. | |
534 | */ | |
535 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
536 | { | |
537 | struct ipv6_pinfo *np = inet6_sk(sk); | |
538 | struct sk_buff *opt_skb = NULL; | |
539 | ||
540 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
541 | goes to IPv4 receive handler and backlogged. | |
542 | From backlog it always goes here. Kerboom... | |
543 | Fortunately, dccp_rcv_established and rcv_established | |
544 | handle them correctly, but it is not case with | |
545 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
546 | */ | |
547 | ||
548 | if (skb->protocol == htons(ETH_P_IP)) | |
549 | return dccp_v4_do_rcv(sk, skb); | |
550 | ||
fda9ef5d | 551 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
552 | goto discard; |
553 | ||
554 | /* | |
45329e71 ACM |
555 | * socket locking is here for SMP purposes as backlog rcv is currently |
556 | * called with bh processing disabled. | |
3df80d93 ACM |
557 | */ |
558 | ||
559 | /* Do Stevens' IPV6_PKTOPTIONS. | |
560 | ||
561 | Yes, guys, it is the only place in our code, where we | |
562 | may make it not affecting IPv4. | |
563 | The rest of code is protocol independent, | |
564 | and I do not like idea to uglify IPv4. | |
565 | ||
566 | Actually, all the idea behind IPV6_PKTOPTIONS | |
567 | looks not very well thought. For now we latch | |
568 | options, received in the last packet, enqueued | |
569 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 570 | --ANK (980728) |
3df80d93 ACM |
571 | */ |
572 | if (np->rxopt.all) | |
89e7e577 GR |
573 | /* |
574 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
575 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
576 | */ | |
3df80d93 ACM |
577 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
578 | ||
579 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
580 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
581 | goto reset; | |
fd169f15 | 582 | if (opt_skb) { |
89e7e577 | 583 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
584 | __kfree_skb(opt_skb); |
585 | } | |
3df80d93 ACM |
586 | return 0; |
587 | } | |
588 | ||
d83ca5ac GR |
589 | /* |
590 | * Step 3: Process LISTEN state | |
591 | * If S.state == LISTEN, | |
592 | * If P.type == Request or P contains a valid Init Cookie option, | |
593 | * (* Must scan the packet's options to check for Init | |
594 | * Cookies. Only Init Cookies are processed here, | |
595 | * however; other options are processed in Step 8. This | |
596 | * scan need only be performed if the endpoint uses Init | |
597 | * Cookies *) | |
598 | * (* Generate a new socket and switch to that socket *) | |
599 | * Set S := new socket for this port pair | |
600 | * S.state = RESPOND | |
601 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
602 | * Initialize S.GAR := S.ISS | |
603 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
604 | * Continue with S.state == RESPOND | |
605 | * (* A Response packet will be generated in Step 11 *) | |
606 | * Otherwise, | |
607 | * Generate Reset(No Connection) unless P.type == Reset | |
608 | * Drop packet and return | |
609 | * | |
610 | * NOTE: the check for the packet types is done in | |
611 | * dccp_rcv_state_process | |
612 | */ | |
3df80d93 ACM |
613 | |
614 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
615 | goto reset; | |
fd169f15 | 616 | if (opt_skb) { |
89e7e577 | 617 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
618 | __kfree_skb(opt_skb); |
619 | } | |
3df80d93 ACM |
620 | return 0; |
621 | ||
622 | reset: | |
cfb6eeb4 | 623 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 624 | discard: |
45329e71 | 625 | if (opt_skb != NULL) |
3df80d93 ACM |
626 | __kfree_skb(opt_skb); |
627 | kfree_skb(skb); | |
628 | return 0; | |
629 | } | |
630 | ||
e5bbef20 | 631 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
632 | { |
633 | const struct dccp_hdr *dh; | |
3df80d93 | 634 | struct sock *sk; |
6f4e5fff | 635 | int min_cov; |
3df80d93 | 636 | |
6f4e5fff | 637 | /* Step 1: Check header basics */ |
3df80d93 ACM |
638 | |
639 | if (dccp_invalid_packet(skb)) | |
640 | goto discard_it; | |
641 | ||
6f4e5fff | 642 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
643 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
644 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 645 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
646 | goto discard_it; |
647 | } | |
648 | ||
3df80d93 ACM |
649 | dh = dccp_hdr(skb); |
650 | ||
fde20105 | 651 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
652 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
653 | ||
654 | if (dccp_packet_without_ack(skb)) | |
655 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
656 | else | |
657 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
658 | ||
659 | /* Step 2: | |
8109b02b | 660 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 | 661 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
870c3151 ED |
662 | dh->dccph_sport, dh->dccph_dport, |
663 | inet6_iif(skb)); | |
45329e71 | 664 | /* |
3df80d93 | 665 | * Step 2: |
8109b02b | 666 | * If no socket ... |
3df80d93 | 667 | */ |
d23c7107 GR |
668 | if (sk == NULL) { |
669 | dccp_pr_debug("failed to look up flow ID in table and " | |
670 | "get corresponding socket\n"); | |
3df80d93 | 671 | goto no_dccp_socket; |
d23c7107 | 672 | } |
3df80d93 | 673 | |
45329e71 | 674 | /* |
3df80d93 | 675 | * Step 2: |
8109b02b | 676 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
677 | * Generate Reset(No Connection) unless P.type == Reset |
678 | * Drop packet and return | |
679 | */ | |
d23c7107 GR |
680 | if (sk->sk_state == DCCP_TIME_WAIT) { |
681 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
682 | inet_twsk_put(inet_twsk(sk)); | |
683 | goto no_dccp_socket; | |
684 | } | |
3df80d93 | 685 | |
079096f1 ED |
686 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
687 | struct request_sock *req = inet_reqsk(sk); | |
688 | struct sock *nsk = NULL; | |
689 | ||
690 | sk = req->rsk_listener; | |
691 | if (sk->sk_state == DCCP_LISTEN) | |
692 | nsk = dccp_check_req(sk, skb, req); | |
693 | if (!nsk) { | |
694 | reqsk_put(req); | |
695 | goto discard_it; | |
696 | } | |
697 | if (nsk == sk) { | |
698 | sock_hold(sk); | |
699 | reqsk_put(req); | |
700 | } else if (dccp_child_process(sk, nsk, skb)) { | |
701 | dccp_v6_ctl_send_reset(sk, skb); | |
702 | goto discard_it; | |
703 | } else { | |
704 | return 0; | |
705 | } | |
706 | } | |
6f4e5fff GR |
707 | /* |
708 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
709 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
710 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
711 | */ |
712 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
713 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
714 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
715 | dh->dccph_cscov, min_cov); | |
716 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
717 | goto discard_and_relse; | |
718 | } | |
719 | ||
3df80d93 ACM |
720 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
721 | goto discard_and_relse; | |
722 | ||
58a5a7b9 | 723 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
724 | |
725 | no_dccp_socket: | |
726 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
727 | goto discard_it; | |
728 | /* | |
729 | * Step 2: | |
8109b02b | 730 | * If no socket ... |
3df80d93 ACM |
731 | * Generate Reset(No Connection) unless P.type == Reset |
732 | * Drop packet and return | |
733 | */ | |
734 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
735 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
736 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 737 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 738 | } |
3df80d93 | 739 | |
d23c7107 | 740 | discard_it: |
3df80d93 ACM |
741 | kfree_skb(skb); |
742 | return 0; | |
743 | ||
744 | discard_and_relse: | |
745 | sock_put(sk); | |
746 | goto discard_it; | |
3df80d93 ACM |
747 | } |
748 | ||
73c9e02c GR |
749 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
750 | int addr_len) | |
751 | { | |
752 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
753 | struct inet_connection_sock *icsk = inet_csk(sk); | |
754 | struct inet_sock *inet = inet_sk(sk); | |
755 | struct ipv6_pinfo *np = inet6_sk(sk); | |
756 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 757 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 758 | struct flowi6 fl6; |
73c9e02c GR |
759 | struct dst_entry *dst; |
760 | int addr_type; | |
761 | int err; | |
762 | ||
763 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
764 | ||
765 | if (addr_len < SIN6_LEN_RFC2133) | |
766 | return -EINVAL; | |
767 | ||
768 | if (usin->sin6_family != AF_INET6) | |
769 | return -EAFNOSUPPORT; | |
770 | ||
4c9483b2 | 771 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
772 | |
773 | if (np->sndflow) { | |
4c9483b2 DM |
774 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
775 | IP6_ECN_flow_init(fl6.flowlabel); | |
776 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 777 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 778 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
779 | if (flowlabel == NULL) |
780 | return -EINVAL; | |
73c9e02c GR |
781 | fl6_sock_release(flowlabel); |
782 | } | |
783 | } | |
784 | /* | |
785 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
786 | */ | |
787 | if (ipv6_addr_any(&usin->sin6_addr)) | |
788 | usin->sin6_addr.s6_addr[15] = 1; | |
789 | ||
790 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
791 | ||
792 | if (addr_type & IPV6_ADDR_MULTICAST) | |
793 | return -ENETUNREACH; | |
794 | ||
795 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
796 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
797 | usin->sin6_scope_id) { | |
798 | /* If interface is set while binding, indices | |
799 | * must coincide. | |
800 | */ | |
801 | if (sk->sk_bound_dev_if && | |
802 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
803 | return -EINVAL; | |
804 | ||
805 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
806 | } | |
807 | ||
808 | /* Connect to link-local address requires an interface */ | |
809 | if (!sk->sk_bound_dev_if) | |
810 | return -EINVAL; | |
811 | } | |
812 | ||
efe4208f | 813 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 814 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
815 | |
816 | /* | |
817 | * DCCP over IPv4 | |
818 | */ | |
819 | if (addr_type == IPV6_ADDR_MAPPED) { | |
820 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
821 | struct sockaddr_in sin; | |
822 | ||
823 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
824 | ||
825 | if (__ipv6_only_sock(sk)) | |
826 | return -ENETUNREACH; | |
827 | ||
828 | sin.sin_family = AF_INET; | |
829 | sin.sin_port = usin->sin6_port; | |
830 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
831 | ||
832 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
833 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
834 | ||
835 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
836 | if (err) { | |
837 | icsk->icsk_ext_hdr_len = exthdrlen; | |
838 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
839 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
840 | goto failure; | |
73c9e02c | 841 | } |
d1e559d0 | 842 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
843 | return err; |
844 | } | |
845 | ||
efe4208f ED |
846 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
847 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 848 | |
4c9483b2 | 849 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 850 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 851 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 852 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
853 | fl6.fl6_dport = usin->sin6_port; |
854 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 855 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 856 | |
4c9483b2 | 857 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 858 | |
0e0d44ab | 859 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
860 | if (IS_ERR(dst)) { |
861 | err = PTR_ERR(dst); | |
73c9e02c | 862 | goto failure; |
14e50e57 | 863 | } |
73c9e02c GR |
864 | |
865 | if (saddr == NULL) { | |
4c9483b2 | 866 | saddr = &fl6.saddr; |
efe4208f | 867 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
868 | } |
869 | ||
870 | /* set the source address */ | |
4e3fd7a0 | 871 | np->saddr = *saddr; |
c720c7e8 | 872 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
873 | |
874 | __ip6_dst_store(sk, dst, NULL, NULL); | |
875 | ||
876 | icsk->icsk_ext_hdr_len = 0; | |
877 | if (np->opt != NULL) | |
878 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
879 | np->opt->opt_nflen); | |
880 | ||
c720c7e8 | 881 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
882 | |
883 | dccp_set_state(sk, DCCP_REQUESTING); | |
884 | err = inet6_hash_connect(&dccp_death_row, sk); | |
885 | if (err) | |
886 | goto late_failure; | |
d7f7365f GR |
887 | |
888 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 889 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
890 | inet->inet_sport, |
891 | inet->inet_dport); | |
73c9e02c GR |
892 | err = dccp_connect(sk); |
893 | if (err) | |
894 | goto late_failure; | |
895 | ||
896 | return 0; | |
897 | ||
898 | late_failure: | |
899 | dccp_set_state(sk, DCCP_CLOSED); | |
900 | __sk_dst_reset(sk); | |
901 | failure: | |
c720c7e8 | 902 | inet->inet_dport = 0; |
73c9e02c GR |
903 | sk->sk_route_caps = 0; |
904 | return err; | |
905 | } | |
906 | ||
3b401a81 | 907 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
908 | .queue_xmit = inet6_csk_xmit, |
909 | .send_check = dccp_v6_send_check, | |
910 | .rebuild_header = inet6_sk_rebuild_header, | |
911 | .conn_request = dccp_v6_conn_request, | |
912 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
913 | .net_header_len = sizeof(struct ipv6hdr), | |
914 | .setsockopt = ipv6_setsockopt, | |
915 | .getsockopt = ipv6_getsockopt, | |
916 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
917 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 918 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 919 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
920 | .compat_setsockopt = compat_ipv6_setsockopt, |
921 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 922 | #endif |
3df80d93 ACM |
923 | }; |
924 | ||
925 | /* | |
926 | * DCCP over IPv4 via INET6 API | |
927 | */ | |
3b401a81 | 928 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
929 | .queue_xmit = ip_queue_xmit, |
930 | .send_check = dccp_v4_send_check, | |
931 | .rebuild_header = inet_sk_rebuild_header, | |
932 | .conn_request = dccp_v6_conn_request, | |
933 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
934 | .net_header_len = sizeof(struct iphdr), | |
935 | .setsockopt = ipv6_setsockopt, | |
936 | .getsockopt = ipv6_getsockopt, | |
937 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
938 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 939 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
940 | .compat_setsockopt = compat_ipv6_setsockopt, |
941 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 942 | #endif |
3df80d93 ACM |
943 | }; |
944 | ||
945 | /* NOTE: A lot of things set to zero explicitly by call to | |
946 | * sk_alloc() so need not be done here. | |
947 | */ | |
948 | static int dccp_v6_init_sock(struct sock *sk) | |
949 | { | |
72478873 ACM |
950 | static __u8 dccp_v6_ctl_sock_initialized; |
951 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 952 | |
72478873 ACM |
953 | if (err == 0) { |
954 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
955 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 956 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 957 | } |
3df80d93 ACM |
958 | |
959 | return err; | |
960 | } | |
961 | ||
7d06b2e0 | 962 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 963 | { |
3e0fadc5 | 964 | dccp_destroy_sock(sk); |
7d06b2e0 | 965 | inet6_destroy_sock(sk); |
3df80d93 ACM |
966 | } |
967 | ||
73c9e02c GR |
968 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
969 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
970 | }; | |
971 | ||
3df80d93 | 972 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
973 | .name = "DCCPv6", |
974 | .owner = THIS_MODULE, | |
975 | .close = dccp_close, | |
976 | .connect = dccp_v6_connect, | |
977 | .disconnect = dccp_disconnect, | |
978 | .ioctl = dccp_ioctl, | |
979 | .init = dccp_v6_init_sock, | |
980 | .setsockopt = dccp_setsockopt, | |
981 | .getsockopt = dccp_getsockopt, | |
982 | .sendmsg = dccp_sendmsg, | |
983 | .recvmsg = dccp_recvmsg, | |
984 | .backlog_rcv = dccp_v6_do_rcv, | |
77a6a471 | 985 | .hash = inet_hash, |
ab1e0a13 | 986 | .unhash = inet_unhash, |
543d9cfe | 987 | .accept = inet_csk_accept, |
ab1e0a13 | 988 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
989 | .shutdown = dccp_shutdown, |
990 | .destroy = dccp_v6_destroy_sock, | |
991 | .orphan_count = &dccp_orphan_count, | |
992 | .max_header = MAX_DCCP_HEADER, | |
993 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 994 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
995 | .rsk_prot = &dccp6_request_sock_ops, |
996 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 997 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 998 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
999 | .compat_setsockopt = compat_dccp_setsockopt, |
1000 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1001 | #endif |
3df80d93 ACM |
1002 | }; |
1003 | ||
41135cc8 | 1004 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1005 | .handler = dccp_v6_rcv, |
1006 | .err_handler = dccp_v6_err, | |
1007 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1008 | }; |
1009 | ||
5708e868 | 1010 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1011 | .family = PF_INET6, |
1012 | .owner = THIS_MODULE, | |
1013 | .release = inet6_release, | |
1014 | .bind = inet6_bind, | |
1015 | .connect = inet_stream_connect, | |
1016 | .socketpair = sock_no_socketpair, | |
1017 | .accept = inet_accept, | |
1018 | .getname = inet6_getname, | |
1019 | .poll = dccp_poll, | |
1020 | .ioctl = inet6_ioctl, | |
1021 | .listen = inet_dccp_listen, | |
1022 | .shutdown = inet_shutdown, | |
1023 | .setsockopt = sock_common_setsockopt, | |
1024 | .getsockopt = sock_common_getsockopt, | |
1025 | .sendmsg = inet_sendmsg, | |
1026 | .recvmsg = sock_common_recvmsg, | |
1027 | .mmap = sock_no_mmap, | |
1028 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1029 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1030 | .compat_setsockopt = compat_sock_common_setsockopt, |
1031 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1032 | #endif |
3df80d93 ACM |
1033 | }; |
1034 | ||
1035 | static struct inet_protosw dccp_v6_protosw = { | |
1036 | .type = SOCK_DCCP, | |
1037 | .protocol = IPPROTO_DCCP, | |
1038 | .prot = &dccp_v6_prot, | |
1039 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1040 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1041 | }; |
1042 | ||
2c8c1e72 | 1043 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1044 | { |
d14a0ebd GR |
1045 | if (dccp_hashinfo.bhash == NULL) |
1046 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1047 | |
d14a0ebd GR |
1048 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1049 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1050 | } |
1051 | ||
2c8c1e72 | 1052 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1053 | { |
334527d3 | 1054 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1055 | } |
1056 | ||
1057 | static struct pernet_operations dccp_v6_ops = { | |
1058 | .init = dccp_v6_init_net, | |
1059 | .exit = dccp_v6_exit_net, | |
1060 | }; | |
1061 | ||
3df80d93 ACM |
1062 | static int __init dccp_v6_init(void) |
1063 | { | |
1064 | int err = proto_register(&dccp_v6_prot, 1); | |
1065 | ||
1066 | if (err != 0) | |
1067 | goto out; | |
1068 | ||
1069 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1070 | if (err != 0) | |
1071 | goto out_unregister_proto; | |
1072 | ||
1073 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1074 | |
8231bd27 PE |
1075 | err = register_pernet_subsys(&dccp_v6_ops); |
1076 | if (err != 0) | |
1077 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1078 | out: |
1079 | return err; | |
8231bd27 PE |
1080 | |
1081 | out_destroy_ctl_sock: | |
72478873 ACM |
1082 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1083 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1084 | out_unregister_proto: |
1085 | proto_unregister(&dccp_v6_prot); | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | static void __exit dccp_v6_exit(void) | |
1090 | { | |
8231bd27 | 1091 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1092 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1093 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1094 | proto_unregister(&dccp_v6_prot); | |
1095 | } | |
1096 | ||
1097 | module_init(dccp_v6_init); | |
1098 | module_exit(dccp_v6_exit); | |
1099 | ||
1100 | /* | |
1101 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1102 | * values directly, Also cover the case where the protocol is not specified, | |
1103 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1104 | */ | |
7131c6c7 JD |
1105 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1106 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1107 | MODULE_LICENSE("GPL"); |
1108 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1109 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |