]>
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, | |
5e0724d0 ED |
383 | struct dst_entry *dst, |
384 | struct request_sock *req_unhash, | |
385 | bool *own_req) | |
3df80d93 | 386 | { |
634fb979 | 387 | struct inet_request_sock *ireq = inet_rsk(req); |
0c27171e ED |
388 | struct ipv6_pinfo *newnp; |
389 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
3df80d93 | 390 | struct inet_sock *newinet; |
3df80d93 ACM |
391 | struct dccp6_sock *newdp6; |
392 | struct sock *newsk; | |
3df80d93 ACM |
393 | |
394 | if (skb->protocol == htons(ETH_P_IP)) { | |
395 | /* | |
396 | * v6 mapped | |
397 | */ | |
5e0724d0 ED |
398 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
399 | req_unhash, own_req); | |
45329e71 | 400 | if (newsk == NULL) |
3df80d93 ACM |
401 | return NULL; |
402 | ||
403 | newdp6 = (struct dccp6_sock *)newsk; | |
3df80d93 ACM |
404 | newinet = inet_sk(newsk); |
405 | newinet->pinet6 = &newdp6->inet6; | |
406 | newnp = inet6_sk(newsk); | |
407 | ||
408 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
409 | ||
d1e559d0 | 410 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
3df80d93 ACM |
411 | |
412 | inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; | |
413 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; | |
414 | newnp->pktoptions = NULL; | |
415 | newnp->opt = NULL; | |
416 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 417 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 ACM |
418 | |
419 | /* | |
420 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
421 | * here, dccp_create_openreq_child now does this for us, see the comment in | |
422 | * that function for the gory details. -acme | |
423 | */ | |
424 | ||
425 | /* It is tricky place. Until this moment IPv4 tcp | |
426 | worked with IPv6 icsk.icsk_af_ops. | |
427 | Sync it now. | |
428 | */ | |
d83d8461 | 429 | dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
3df80d93 ACM |
430 | |
431 | return newsk; | |
432 | } | |
433 | ||
3df80d93 ACM |
434 | |
435 | if (sk_acceptq_is_full(sk)) | |
436 | goto out_overflow; | |
437 | ||
f76b33c3 | 438 | if (!dst) { |
4c9483b2 DM |
439 | struct flowi6 fl6; |
440 | ||
f76b33c3 ED |
441 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
442 | if (!dst) | |
3df80d93 | 443 | goto out; |
45329e71 | 444 | } |
3df80d93 ACM |
445 | |
446 | newsk = dccp_create_openreq_child(sk, req, skb); | |
447 | if (newsk == NULL) | |
093d2823 | 448 | goto out_nonewsk; |
3df80d93 ACM |
449 | |
450 | /* | |
451 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
452 | * count here, dccp_create_openreq_child now does this for us, see the | |
453 | * comment in that function for the gory details. -acme | |
454 | */ | |
455 | ||
8e1ef0a9 | 456 | __ip6_dst_store(newsk, dst, NULL, NULL); |
45329e71 ACM |
457 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
458 | NETIF_F_TSO); | |
3df80d93 ACM |
459 | newdp6 = (struct dccp6_sock *)newsk; |
460 | newinet = inet_sk(newsk); | |
461 | newinet->pinet6 = &newdp6->inet6; | |
3df80d93 ACM |
462 | newnp = inet6_sk(newsk); |
463 | ||
464 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
465 | ||
634fb979 ED |
466 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
467 | newnp->saddr = ireq->ir_v6_loc_addr; | |
468 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
469 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
3df80d93 | 470 | |
45329e71 | 471 | /* Now IPv6 options... |
3df80d93 ACM |
472 | |
473 | First: no IPv4 options. | |
474 | */ | |
f6d8bd05 | 475 | newinet->inet_opt = NULL; |
3df80d93 ACM |
476 | |
477 | /* Clone RX bits */ | |
478 | newnp->rxopt.all = np->rxopt.all; | |
479 | ||
480 | /* Clone pktoptions received with SYN */ | |
481 | newnp->pktoptions = NULL; | |
634fb979 ED |
482 | if (ireq->pktopts != NULL) { |
483 | newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); | |
484 | consume_skb(ireq->pktopts); | |
485 | ireq->pktopts = NULL; | |
3df80d93 ACM |
486 | if (newnp->pktoptions) |
487 | skb_set_owner_r(newnp->pktoptions, newsk); | |
488 | } | |
489 | newnp->opt = NULL; | |
490 | newnp->mcast_oif = inet6_iif(skb); | |
0660e03f | 491 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
3df80d93 | 492 | |
45329e71 ACM |
493 | /* |
494 | * Clone native IPv6 options from listening socket (if any) | |
495 | * | |
496 | * Yes, keeping reference count would be much more clever, but we make | |
497 | * one more one thing there: reattach optmem to newsk. | |
3df80d93 | 498 | */ |
0979e465 RL |
499 | if (np->opt != NULL) |
500 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
3df80d93 | 501 | |
d83d8461 | 502 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45329e71 | 503 | if (newnp->opt != NULL) |
d83d8461 ACM |
504 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
505 | newnp->opt->opt_flen); | |
3df80d93 ACM |
506 | |
507 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
508 | ||
c720c7e8 ED |
509 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
510 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
3df80d93 | 511 | |
093d2823 | 512 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
513 | inet_csk_prepare_forced_close(newsk); |
514 | dccp_done(newsk); | |
093d2823 BS |
515 | goto out; |
516 | } | |
5e0724d0 | 517 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
3df80d93 ACM |
518 | |
519 | return newsk; | |
520 | ||
521 | out_overflow: | |
de0744af | 522 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
523 | out_nonewsk: |
524 | dst_release(dst); | |
3df80d93 | 525 | out: |
de0744af | 526 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
3df80d93 ACM |
527 | return NULL; |
528 | } | |
529 | ||
530 | /* The socket must have it's spinlock held when we get | |
531 | * here. | |
532 | * | |
533 | * We have a potential double-lock case here, so even when | |
534 | * doing backlog processing we use the BH locking scheme. | |
535 | * This is because we cannot sleep with the original spinlock | |
536 | * held. | |
537 | */ | |
538 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
539 | { | |
540 | struct ipv6_pinfo *np = inet6_sk(sk); | |
541 | struct sk_buff *opt_skb = NULL; | |
542 | ||
543 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
544 | goes to IPv4 receive handler and backlogged. | |
545 | From backlog it always goes here. Kerboom... | |
546 | Fortunately, dccp_rcv_established and rcv_established | |
547 | handle them correctly, but it is not case with | |
548 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK | |
549 | */ | |
550 | ||
551 | if (skb->protocol == htons(ETH_P_IP)) | |
552 | return dccp_v4_do_rcv(sk, skb); | |
553 | ||
fda9ef5d | 554 | if (sk_filter(sk, skb)) |
3df80d93 ACM |
555 | goto discard; |
556 | ||
557 | /* | |
45329e71 ACM |
558 | * socket locking is here for SMP purposes as backlog rcv is currently |
559 | * called with bh processing disabled. | |
3df80d93 ACM |
560 | */ |
561 | ||
562 | /* Do Stevens' IPV6_PKTOPTIONS. | |
563 | ||
564 | Yes, guys, it is the only place in our code, where we | |
565 | may make it not affecting IPv4. | |
566 | The rest of code is protocol independent, | |
567 | and I do not like idea to uglify IPv4. | |
568 | ||
569 | Actually, all the idea behind IPV6_PKTOPTIONS | |
570 | looks not very well thought. For now we latch | |
571 | options, received in the last packet, enqueued | |
572 | by tcp. Feel free to propose better solution. | |
c9eaf173 | 573 | --ANK (980728) |
3df80d93 ACM |
574 | */ |
575 | if (np->rxopt.all) | |
89e7e577 GR |
576 | /* |
577 | * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below | |
578 | * (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example. | |
579 | */ | |
3df80d93 ACM |
580 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
581 | ||
582 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
583 | if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) | |
584 | goto reset; | |
fd169f15 | 585 | if (opt_skb) { |
89e7e577 | 586 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
587 | __kfree_skb(opt_skb); |
588 | } | |
3df80d93 ACM |
589 | return 0; |
590 | } | |
591 | ||
d83ca5ac GR |
592 | /* |
593 | * Step 3: Process LISTEN state | |
594 | * If S.state == LISTEN, | |
595 | * If P.type == Request or P contains a valid Init Cookie option, | |
596 | * (* Must scan the packet's options to check for Init | |
597 | * Cookies. Only Init Cookies are processed here, | |
598 | * however; other options are processed in Step 8. This | |
599 | * scan need only be performed if the endpoint uses Init | |
600 | * Cookies *) | |
601 | * (* Generate a new socket and switch to that socket *) | |
602 | * Set S := new socket for this port pair | |
603 | * S.state = RESPOND | |
604 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
605 | * Initialize S.GAR := S.ISS | |
606 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
607 | * Continue with S.state == RESPOND | |
608 | * (* A Response packet will be generated in Step 11 *) | |
609 | * Otherwise, | |
610 | * Generate Reset(No Connection) unless P.type == Reset | |
611 | * Drop packet and return | |
612 | * | |
613 | * NOTE: the check for the packet types is done in | |
614 | * dccp_rcv_state_process | |
615 | */ | |
3df80d93 ACM |
616 | |
617 | if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) | |
618 | goto reset; | |
fd169f15 | 619 | if (opt_skb) { |
89e7e577 | 620 | /* XXX This is where we would goto ipv6_pktoptions. */ |
fd169f15 DM |
621 | __kfree_skb(opt_skb); |
622 | } | |
3df80d93 ACM |
623 | return 0; |
624 | ||
625 | reset: | |
cfb6eeb4 | 626 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 627 | discard: |
45329e71 | 628 | if (opt_skb != NULL) |
3df80d93 ACM |
629 | __kfree_skb(opt_skb); |
630 | kfree_skb(skb); | |
631 | return 0; | |
632 | } | |
633 | ||
e5bbef20 | 634 | static int dccp_v6_rcv(struct sk_buff *skb) |
3df80d93 ACM |
635 | { |
636 | const struct dccp_hdr *dh; | |
3df80d93 | 637 | struct sock *sk; |
6f4e5fff | 638 | int min_cov; |
3df80d93 | 639 | |
6f4e5fff | 640 | /* Step 1: Check header basics */ |
3df80d93 ACM |
641 | |
642 | if (dccp_invalid_packet(skb)) | |
643 | goto discard_it; | |
644 | ||
6f4e5fff | 645 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
0660e03f ACM |
646 | if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
647 | &ipv6_hdr(skb)->daddr)) { | |
59348b19 | 648 | DCCP_WARN("dropped packet with invalid checksum\n"); |
6f4e5fff GR |
649 | goto discard_it; |
650 | } | |
651 | ||
3df80d93 ACM |
652 | dh = dccp_hdr(skb); |
653 | ||
fde20105 | 654 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
3df80d93 ACM |
655 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
656 | ||
657 | if (dccp_packet_without_ack(skb)) | |
658 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
659 | else | |
660 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
661 | ||
4bdc3d66 | 662 | lookup: |
9a1f27c4 | 663 | sk = __inet6_lookup_skb(&dccp_hashinfo, skb, |
870c3151 ED |
664 | dh->dccph_sport, dh->dccph_dport, |
665 | inet6_iif(skb)); | |
4bdc3d66 | 666 | if (!sk) { |
d23c7107 GR |
667 | dccp_pr_debug("failed to look up flow ID in table and " |
668 | "get corresponding socket\n"); | |
3df80d93 | 669 | goto no_dccp_socket; |
d23c7107 | 670 | } |
3df80d93 | 671 | |
45329e71 | 672 | /* |
3df80d93 | 673 | * Step 2: |
8109b02b | 674 | * ... or S.state == TIMEWAIT, |
3df80d93 ACM |
675 | * Generate Reset(No Connection) unless P.type == Reset |
676 | * Drop packet and return | |
677 | */ | |
d23c7107 GR |
678 | if (sk->sk_state == DCCP_TIME_WAIT) { |
679 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); | |
680 | inet_twsk_put(inet_twsk(sk)); | |
681 | goto no_dccp_socket; | |
682 | } | |
3df80d93 | 683 | |
079096f1 ED |
684 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
685 | struct request_sock *req = inet_reqsk(sk); | |
686 | struct sock *nsk = NULL; | |
687 | ||
688 | sk = req->rsk_listener; | |
4bdc3d66 | 689 | if (likely(sk->sk_state == DCCP_LISTEN)) { |
079096f1 | 690 | nsk = dccp_check_req(sk, skb, req); |
4bdc3d66 | 691 | } else { |
f03f2e15 | 692 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
693 | goto lookup; |
694 | } | |
079096f1 ED |
695 | if (!nsk) { |
696 | reqsk_put(req); | |
697 | goto discard_it; | |
698 | } | |
699 | if (nsk == sk) { | |
700 | sock_hold(sk); | |
701 | reqsk_put(req); | |
702 | } else if (dccp_child_process(sk, nsk, skb)) { | |
703 | dccp_v6_ctl_send_reset(sk, skb); | |
704 | goto discard_it; | |
705 | } else { | |
706 | return 0; | |
707 | } | |
708 | } | |
6f4e5fff GR |
709 | /* |
710 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
711 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
712 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
713 | */ |
714 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
715 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
716 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
717 | dh->dccph_cscov, min_cov); | |
718 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ | |
719 | goto discard_and_relse; | |
720 | } | |
721 | ||
3df80d93 ACM |
722 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
723 | goto discard_and_relse; | |
724 | ||
58a5a7b9 | 725 | return sk_receive_skb(sk, skb, 1) ? -1 : 0; |
3df80d93 ACM |
726 | |
727 | no_dccp_socket: | |
728 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
729 | goto discard_it; | |
730 | /* | |
731 | * Step 2: | |
8109b02b | 732 | * If no socket ... |
3df80d93 ACM |
733 | * Generate Reset(No Connection) unless P.type == Reset |
734 | * Drop packet and return | |
735 | */ | |
736 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
737 | DCCP_SKB_CB(skb)->dccpd_reset_code = | |
738 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 739 | dccp_v6_ctl_send_reset(sk, skb); |
3df80d93 | 740 | } |
3df80d93 | 741 | |
d23c7107 | 742 | discard_it: |
3df80d93 ACM |
743 | kfree_skb(skb); |
744 | return 0; | |
745 | ||
746 | discard_and_relse: | |
747 | sock_put(sk); | |
748 | goto discard_it; | |
3df80d93 ACM |
749 | } |
750 | ||
73c9e02c GR |
751 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
752 | int addr_len) | |
753 | { | |
754 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; | |
755 | struct inet_connection_sock *icsk = inet_csk(sk); | |
756 | struct inet_sock *inet = inet_sk(sk); | |
757 | struct ipv6_pinfo *np = inet6_sk(sk); | |
758 | struct dccp_sock *dp = dccp_sk(sk); | |
20c59de2 | 759 | struct in6_addr *saddr = NULL, *final_p, final; |
4c9483b2 | 760 | struct flowi6 fl6; |
73c9e02c GR |
761 | struct dst_entry *dst; |
762 | int addr_type; | |
763 | int err; | |
764 | ||
765 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
766 | ||
767 | if (addr_len < SIN6_LEN_RFC2133) | |
768 | return -EINVAL; | |
769 | ||
770 | if (usin->sin6_family != AF_INET6) | |
771 | return -EAFNOSUPPORT; | |
772 | ||
4c9483b2 | 773 | memset(&fl6, 0, sizeof(fl6)); |
73c9e02c GR |
774 | |
775 | if (np->sndflow) { | |
4c9483b2 DM |
776 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
777 | IP6_ECN_flow_init(fl6.flowlabel); | |
778 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { | |
73c9e02c | 779 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 780 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
73c9e02c GR |
781 | if (flowlabel == NULL) |
782 | return -EINVAL; | |
73c9e02c GR |
783 | fl6_sock_release(flowlabel); |
784 | } | |
785 | } | |
786 | /* | |
787 | * connect() to INADDR_ANY means loopback (BSD'ism). | |
788 | */ | |
789 | if (ipv6_addr_any(&usin->sin6_addr)) | |
790 | usin->sin6_addr.s6_addr[15] = 1; | |
791 | ||
792 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
793 | ||
794 | if (addr_type & IPV6_ADDR_MULTICAST) | |
795 | return -ENETUNREACH; | |
796 | ||
797 | if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
798 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
799 | usin->sin6_scope_id) { | |
800 | /* If interface is set while binding, indices | |
801 | * must coincide. | |
802 | */ | |
803 | if (sk->sk_bound_dev_if && | |
804 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
805 | return -EINVAL; | |
806 | ||
807 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
808 | } | |
809 | ||
810 | /* Connect to link-local address requires an interface */ | |
811 | if (!sk->sk_bound_dev_if) | |
812 | return -EINVAL; | |
813 | } | |
814 | ||
efe4208f | 815 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 816 | np->flow_label = fl6.flowlabel; |
73c9e02c GR |
817 | |
818 | /* | |
819 | * DCCP over IPv4 | |
820 | */ | |
821 | if (addr_type == IPV6_ADDR_MAPPED) { | |
822 | u32 exthdrlen = icsk->icsk_ext_hdr_len; | |
823 | struct sockaddr_in sin; | |
824 | ||
825 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
826 | ||
827 | if (__ipv6_only_sock(sk)) | |
828 | return -ENETUNREACH; | |
829 | ||
830 | sin.sin_family = AF_INET; | |
831 | sin.sin_port = usin->sin6_port; | |
832 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
833 | ||
834 | icsk->icsk_af_ops = &dccp_ipv6_mapped; | |
835 | sk->sk_backlog_rcv = dccp_v4_do_rcv; | |
836 | ||
837 | err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
838 | if (err) { | |
839 | icsk->icsk_ext_hdr_len = exthdrlen; | |
840 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; | |
841 | sk->sk_backlog_rcv = dccp_v6_do_rcv; | |
842 | goto failure; | |
73c9e02c | 843 | } |
d1e559d0 | 844 | np->saddr = sk->sk_v6_rcv_saddr; |
73c9e02c GR |
845 | return err; |
846 | } | |
847 | ||
efe4208f ED |
848 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
849 | saddr = &sk->sk_v6_rcv_saddr; | |
73c9e02c | 850 | |
4c9483b2 | 851 | fl6.flowi6_proto = IPPROTO_DCCP; |
efe4208f | 852 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 853 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 | 854 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
1958b856 DM |
855 | fl6.fl6_dport = usin->sin6_port; |
856 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 | 857 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
73c9e02c | 858 | |
4c9483b2 | 859 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
73c9e02c | 860 | |
0e0d44ab | 861 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
862 | if (IS_ERR(dst)) { |
863 | err = PTR_ERR(dst); | |
73c9e02c | 864 | goto failure; |
14e50e57 | 865 | } |
73c9e02c GR |
866 | |
867 | if (saddr == NULL) { | |
4c9483b2 | 868 | saddr = &fl6.saddr; |
efe4208f | 869 | sk->sk_v6_rcv_saddr = *saddr; |
73c9e02c GR |
870 | } |
871 | ||
872 | /* set the source address */ | |
4e3fd7a0 | 873 | np->saddr = *saddr; |
c720c7e8 | 874 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
73c9e02c GR |
875 | |
876 | __ip6_dst_store(sk, dst, NULL, NULL); | |
877 | ||
878 | icsk->icsk_ext_hdr_len = 0; | |
879 | if (np->opt != NULL) | |
880 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + | |
881 | np->opt->opt_nflen); | |
882 | ||
c720c7e8 | 883 | inet->inet_dport = usin->sin6_port; |
73c9e02c GR |
884 | |
885 | dccp_set_state(sk, DCCP_REQUESTING); | |
886 | err = inet6_hash_connect(&dccp_death_row, sk); | |
887 | if (err) | |
888 | goto late_failure; | |
d7f7365f GR |
889 | |
890 | dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, | |
efe4208f | 891 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
892 | inet->inet_sport, |
893 | inet->inet_dport); | |
73c9e02c GR |
894 | err = dccp_connect(sk); |
895 | if (err) | |
896 | goto late_failure; | |
897 | ||
898 | return 0; | |
899 | ||
900 | late_failure: | |
901 | dccp_set_state(sk, DCCP_CLOSED); | |
902 | __sk_dst_reset(sk); | |
903 | failure: | |
c720c7e8 | 904 | inet->inet_dport = 0; |
73c9e02c GR |
905 | sk->sk_route_caps = 0; |
906 | return err; | |
907 | } | |
908 | ||
3b401a81 | 909 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
543d9cfe ACM |
910 | .queue_xmit = inet6_csk_xmit, |
911 | .send_check = dccp_v6_send_check, | |
912 | .rebuild_header = inet6_sk_rebuild_header, | |
913 | .conn_request = dccp_v6_conn_request, | |
914 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
915 | .net_header_len = sizeof(struct ipv6hdr), | |
916 | .setsockopt = ipv6_setsockopt, | |
917 | .getsockopt = ipv6_getsockopt, | |
918 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
919 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 920 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 921 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
922 | .compat_setsockopt = compat_ipv6_setsockopt, |
923 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 924 | #endif |
3df80d93 ACM |
925 | }; |
926 | ||
927 | /* | |
928 | * DCCP over IPv4 via INET6 API | |
929 | */ | |
3b401a81 | 930 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
543d9cfe ACM |
931 | .queue_xmit = ip_queue_xmit, |
932 | .send_check = dccp_v4_send_check, | |
933 | .rebuild_header = inet_sk_rebuild_header, | |
934 | .conn_request = dccp_v6_conn_request, | |
935 | .syn_recv_sock = dccp_v6_request_recv_sock, | |
936 | .net_header_len = sizeof(struct iphdr), | |
937 | .setsockopt = ipv6_setsockopt, | |
938 | .getsockopt = ipv6_getsockopt, | |
939 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
940 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 941 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
942 | .compat_setsockopt = compat_ipv6_setsockopt, |
943 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 944 | #endif |
3df80d93 ACM |
945 | }; |
946 | ||
947 | /* NOTE: A lot of things set to zero explicitly by call to | |
948 | * sk_alloc() so need not be done here. | |
949 | */ | |
950 | static int dccp_v6_init_sock(struct sock *sk) | |
951 | { | |
72478873 ACM |
952 | static __u8 dccp_v6_ctl_sock_initialized; |
953 | int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); | |
3df80d93 | 954 | |
72478873 ACM |
955 | if (err == 0) { |
956 | if (unlikely(!dccp_v6_ctl_sock_initialized)) | |
957 | dccp_v6_ctl_sock_initialized = 1; | |
3df80d93 | 958 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
72478873 | 959 | } |
3df80d93 ACM |
960 | |
961 | return err; | |
962 | } | |
963 | ||
7d06b2e0 | 964 | static void dccp_v6_destroy_sock(struct sock *sk) |
3df80d93 | 965 | { |
3e0fadc5 | 966 | dccp_destroy_sock(sk); |
7d06b2e0 | 967 | inet6_destroy_sock(sk); |
3df80d93 ACM |
968 | } |
969 | ||
73c9e02c GR |
970 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
971 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), | |
972 | }; | |
973 | ||
3df80d93 | 974 | static struct proto dccp_v6_prot = { |
543d9cfe ACM |
975 | .name = "DCCPv6", |
976 | .owner = THIS_MODULE, | |
977 | .close = dccp_close, | |
978 | .connect = dccp_v6_connect, | |
979 | .disconnect = dccp_disconnect, | |
980 | .ioctl = dccp_ioctl, | |
981 | .init = dccp_v6_init_sock, | |
982 | .setsockopt = dccp_setsockopt, | |
983 | .getsockopt = dccp_getsockopt, | |
984 | .sendmsg = dccp_sendmsg, | |
985 | .recvmsg = dccp_recvmsg, | |
986 | .backlog_rcv = dccp_v6_do_rcv, | |
77a6a471 | 987 | .hash = inet_hash, |
ab1e0a13 | 988 | .unhash = inet_unhash, |
543d9cfe | 989 | .accept = inet_csk_accept, |
ab1e0a13 | 990 | .get_port = inet_csk_get_port, |
543d9cfe ACM |
991 | .shutdown = dccp_shutdown, |
992 | .destroy = dccp_v6_destroy_sock, | |
993 | .orphan_count = &dccp_orphan_count, | |
994 | .max_header = MAX_DCCP_HEADER, | |
995 | .obj_size = sizeof(struct dccp6_sock), | |
3ab5aee7 | 996 | .slab_flags = SLAB_DESTROY_BY_RCU, |
543d9cfe ACM |
997 | .rsk_prot = &dccp6_request_sock_ops, |
998 | .twsk_prot = &dccp6_timewait_sock_ops, | |
39d8cda7 | 999 | .h.hashinfo = &dccp_hashinfo, |
3fdadf7d | 1000 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1001 | .compat_setsockopt = compat_dccp_setsockopt, |
1002 | .compat_getsockopt = compat_dccp_getsockopt, | |
3fdadf7d | 1003 | #endif |
3df80d93 ACM |
1004 | }; |
1005 | ||
41135cc8 | 1006 | static const struct inet6_protocol dccp_v6_protocol = { |
45329e71 ACM |
1007 | .handler = dccp_v6_rcv, |
1008 | .err_handler = dccp_v6_err, | |
1009 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
3df80d93 ACM |
1010 | }; |
1011 | ||
5708e868 | 1012 | static const struct proto_ops inet6_dccp_ops = { |
543d9cfe ACM |
1013 | .family = PF_INET6, |
1014 | .owner = THIS_MODULE, | |
1015 | .release = inet6_release, | |
1016 | .bind = inet6_bind, | |
1017 | .connect = inet_stream_connect, | |
1018 | .socketpair = sock_no_socketpair, | |
1019 | .accept = inet_accept, | |
1020 | .getname = inet6_getname, | |
1021 | .poll = dccp_poll, | |
1022 | .ioctl = inet6_ioctl, | |
1023 | .listen = inet_dccp_listen, | |
1024 | .shutdown = inet_shutdown, | |
1025 | .setsockopt = sock_common_setsockopt, | |
1026 | .getsockopt = sock_common_getsockopt, | |
1027 | .sendmsg = inet_sendmsg, | |
1028 | .recvmsg = sock_common_recvmsg, | |
1029 | .mmap = sock_no_mmap, | |
1030 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1031 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1032 | .compat_setsockopt = compat_sock_common_setsockopt, |
1033 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1034 | #endif |
3df80d93 ACM |
1035 | }; |
1036 | ||
1037 | static struct inet_protosw dccp_v6_protosw = { | |
1038 | .type = SOCK_DCCP, | |
1039 | .protocol = IPPROTO_DCCP, | |
1040 | .prot = &dccp_v6_prot, | |
1041 | .ops = &inet6_dccp_ops, | |
d83d8461 | 1042 | .flags = INET_PROTOSW_ICSK, |
3df80d93 ACM |
1043 | }; |
1044 | ||
2c8c1e72 | 1045 | static int __net_init dccp_v6_init_net(struct net *net) |
8231bd27 | 1046 | { |
d14a0ebd GR |
1047 | if (dccp_hashinfo.bhash == NULL) |
1048 | return -ESOCKTNOSUPPORT; | |
334527d3 | 1049 | |
d14a0ebd GR |
1050 | return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
1051 | SOCK_DCCP, IPPROTO_DCCP, net); | |
8231bd27 PE |
1052 | } |
1053 | ||
2c8c1e72 | 1054 | static void __net_exit dccp_v6_exit_net(struct net *net) |
8231bd27 | 1055 | { |
334527d3 | 1056 | inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
8231bd27 PE |
1057 | } |
1058 | ||
1059 | static struct pernet_operations dccp_v6_ops = { | |
1060 | .init = dccp_v6_init_net, | |
1061 | .exit = dccp_v6_exit_net, | |
1062 | }; | |
1063 | ||
3df80d93 ACM |
1064 | static int __init dccp_v6_init(void) |
1065 | { | |
1066 | int err = proto_register(&dccp_v6_prot, 1); | |
1067 | ||
1068 | if (err != 0) | |
1069 | goto out; | |
1070 | ||
1071 | err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); | |
1072 | if (err != 0) | |
1073 | goto out_unregister_proto; | |
1074 | ||
1075 | inet6_register_protosw(&dccp_v6_protosw); | |
72478873 | 1076 | |
8231bd27 PE |
1077 | err = register_pernet_subsys(&dccp_v6_ops); |
1078 | if (err != 0) | |
1079 | goto out_destroy_ctl_sock; | |
3df80d93 ACM |
1080 | out: |
1081 | return err; | |
8231bd27 PE |
1082 | |
1083 | out_destroy_ctl_sock: | |
72478873 ACM |
1084 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1085 | inet6_unregister_protosw(&dccp_v6_protosw); | |
3df80d93 ACM |
1086 | out_unregister_proto: |
1087 | proto_unregister(&dccp_v6_prot); | |
1088 | goto out; | |
1089 | } | |
1090 | ||
1091 | static void __exit dccp_v6_exit(void) | |
1092 | { | |
8231bd27 | 1093 | unregister_pernet_subsys(&dccp_v6_ops); |
3df80d93 ACM |
1094 | inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
1095 | inet6_unregister_protosw(&dccp_v6_protosw); | |
1096 | proto_unregister(&dccp_v6_prot); | |
1097 | } | |
1098 | ||
1099 | module_init(dccp_v6_init); | |
1100 | module_exit(dccp_v6_exit); | |
1101 | ||
1102 | /* | |
1103 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1104 | * values directly, Also cover the case where the protocol is not specified, | |
1105 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP | |
1106 | */ | |
7131c6c7 JD |
1107 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1108 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); | |
3df80d93 ACM |
1109 | MODULE_LICENSE("GPL"); |
1110 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1111 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol"); |