Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/ipv4.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
7c657876 ACM |
13 | #include <linux/dccp.h> |
14 | #include <linux/icmp.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7c657876 ACM |
16 | #include <linux/module.h> |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/random.h> | |
19 | ||
20 | #include <net/icmp.h> | |
b61fafc4 | 21 | #include <net/inet_common.h> |
7c657876 | 22 | #include <net/inet_hashtables.h> |
14c85021 | 23 | #include <net/inet_sock.h> |
b61fafc4 | 24 | #include <net/protocol.h> |
7c657876 | 25 | #include <net/sock.h> |
6d6ee43e | 26 | #include <net/timewait_sock.h> |
7c657876 ACM |
27 | #include <net/tcp_states.h> |
28 | #include <net/xfrm.h> | |
6e5714ea | 29 | #include <net/secure_seq.h> |
7c657876 | 30 | |
ae31c339 | 31 | #include "ackvec.h" |
7c657876 ACM |
32 | #include "ccid.h" |
33 | #include "dccp.h" | |
afe00251 | 34 | #include "feat.h" |
7c657876 | 35 | |
72478873 | 36 | /* |
13f51d82 | 37 | * The per-net dccp.v4_ctl_sk socket is used for responding to |
72478873 ACM |
38 | * the Out-of-the-blue (OOTB) packets. A control sock will be created |
39 | * for this socket at the initialization time. | |
40 | */ | |
72478873 | 41 | |
f21e68ca | 42 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 | 43 | { |
2d7192d6 | 44 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
7c657876 ACM |
45 | struct inet_sock *inet = inet_sk(sk); |
46 | struct dccp_sock *dp = dccp_sk(sk); | |
dca8b089 | 47 | __be16 orig_sport, orig_dport; |
bada8adc | 48 | __be32 daddr, nexthop; |
2c42758c | 49 | struct flowi4 *fl4; |
2d7192d6 | 50 | struct rtable *rt; |
7c657876 | 51 | int err; |
f6d8bd05 | 52 | struct ip_options_rcu *inet_opt; |
7c657876 ACM |
53 | |
54 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
55 | ||
56 | if (addr_len < sizeof(struct sockaddr_in)) | |
57 | return -EINVAL; | |
58 | ||
59 | if (usin->sin_family != AF_INET) | |
60 | return -EAFNOSUPPORT; | |
61 | ||
62 | nexthop = daddr = usin->sin_addr.s_addr; | |
f6d8bd05 ED |
63 | |
64 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
65 | sock_owned_by_user(sk)); | |
66 | if (inet_opt != NULL && inet_opt->opt.srr) { | |
7c657876 ACM |
67 | if (daddr == 0) |
68 | return -EINVAL; | |
f6d8bd05 | 69 | nexthop = inet_opt->opt.faddr; |
7c657876 ACM |
70 | } |
71 | ||
dca8b089 DM |
72 | orig_sport = inet->inet_sport; |
73 | orig_dport = usin->sin_port; | |
2c42758c DM |
74 | fl4 = &inet->cork.fl.u.ip4; |
75 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, | |
b23dd4fe DM |
76 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
77 | IPPROTO_DCCP, | |
0e0d44ab | 78 | orig_sport, orig_dport, sk); |
b23dd4fe DM |
79 | if (IS_ERR(rt)) |
80 | return PTR_ERR(rt); | |
7c657876 ACM |
81 | |
82 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
83 | ip_rt_put(rt); | |
84 | return -ENETUNREACH; | |
85 | } | |
86 | ||
f6d8bd05 | 87 | if (inet_opt == NULL || !inet_opt->opt.srr) |
2c42758c | 88 | daddr = fl4->daddr; |
7c657876 | 89 | |
c720c7e8 | 90 | if (inet->inet_saddr == 0) |
2c42758c | 91 | inet->inet_saddr = fl4->saddr; |
c720c7e8 | 92 | inet->inet_rcv_saddr = inet->inet_saddr; |
7c657876 | 93 | |
c720c7e8 ED |
94 | inet->inet_dport = usin->sin_port; |
95 | inet->inet_daddr = daddr; | |
7c657876 | 96 | |
d83d8461 | 97 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
f6d8bd05 ED |
98 | if (inet_opt) |
99 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
7c657876 ACM |
100 | /* |
101 | * Socket identity is still unknown (sport may be zero). | |
102 | * However we set state to DCCP_REQUESTING and not releasing socket | |
103 | * lock select source port, enter ourselves into the hash tables and | |
104 | * complete initialization after this. | |
105 | */ | |
106 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 107 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
108 | if (err != 0) |
109 | goto failure; | |
110 | ||
2c42758c | 111 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
b23dd4fe DM |
112 | inet->inet_sport, inet->inet_dport, sk); |
113 | if (IS_ERR(rt)) { | |
525c6465 | 114 | err = PTR_ERR(rt); |
b23dd4fe | 115 | rt = NULL; |
7c657876 | 116 | goto failure; |
b23dd4fe | 117 | } |
7c657876 | 118 | /* OK, now commit destination to socket. */ |
d8d1f30b | 119 | sk_setup_caps(sk, &rt->dst); |
7c657876 | 120 | |
c720c7e8 ED |
121 | dp->dccps_iss = secure_dccp_sequence_number(inet->inet_saddr, |
122 | inet->inet_daddr, | |
123 | inet->inet_sport, | |
124 | inet->inet_dport); | |
125 | inet->inet_id = dp->dccps_iss ^ jiffies; | |
7c657876 ACM |
126 | |
127 | err = dccp_connect(sk); | |
128 | rt = NULL; | |
129 | if (err != 0) | |
130 | goto failure; | |
131 | out: | |
132 | return err; | |
133 | failure: | |
7690af3f ACM |
134 | /* |
135 | * This unhashes the socket and releases the local port, if necessary. | |
136 | */ | |
7c657876 ACM |
137 | dccp_set_state(sk, DCCP_CLOSED); |
138 | ip_rt_put(rt); | |
139 | sk->sk_route_caps = 0; | |
c720c7e8 | 140 | inet->inet_dport = 0; |
7c657876 ACM |
141 | goto out; |
142 | } | |
143 | ||
f21e68ca ACM |
144 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
145 | ||
7c657876 ACM |
146 | /* |
147 | * This routine does path mtu discovery as defined in RFC1191. | |
148 | */ | |
149 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
150 | const struct iphdr *iph, | |
151 | u32 mtu) | |
152 | { | |
153 | struct dst_entry *dst; | |
154 | const struct inet_sock *inet = inet_sk(sk); | |
155 | const struct dccp_sock *dp = dccp_sk(sk); | |
156 | ||
157 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
158 | * send out by Linux are always < 576bytes so they should go through | |
159 | * unfragmented). | |
160 | */ | |
161 | if (sk->sk_state == DCCP_LISTEN) | |
162 | return; | |
163 | ||
80d0a69f DM |
164 | dst = inet_csk_update_pmtu(sk, mtu); |
165 | if (!dst) | |
7c657876 ACM |
166 | return; |
167 | ||
7c657876 ACM |
168 | /* Something is about to be wrong... Remember soft error |
169 | * for the case, if this connection will not able to recover. | |
170 | */ | |
171 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
172 | sk->sk_err_soft = EMSGSIZE; | |
173 | ||
174 | mtu = dst_mtu(dst); | |
175 | ||
176 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
482fc609 | 177 | ip_sk_accept_pmtu(sk) && |
d83d8461 | 178 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
179 | dccp_sync_mss(sk, mtu); |
180 | ||
181 | /* | |
0e64e94e | 182 | * From RFC 4340, sec. 14.1: |
7c657876 | 183 | * |
7690af3f ACM |
184 | * DCCP-Sync packets are the best choice for upward |
185 | * probing, since DCCP-Sync probes do not risk application | |
186 | * data loss. | |
7c657876 | 187 | */ |
e92ae93a | 188 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
189 | } /* else let the usual retransmit timer handle it */ |
190 | } | |
191 | ||
55be7a9c DM |
192 | static void dccp_do_redirect(struct sk_buff *skb, struct sock *sk) |
193 | { | |
194 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
195 | ||
1ed5c48f | 196 | if (dst) |
6700c270 | 197 | dst->ops->redirect(dst, sk, skb); |
55be7a9c DM |
198 | } |
199 | ||
7c657876 ACM |
200 | /* |
201 | * This routine is called by the ICMP module when it gets some sort of error | |
202 | * condition. If err < 0 then the socket should be closed and the error | |
203 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
204 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
205 | * need to find the appropriate port. | |
206 | * | |
207 | * The locking strategy used here is very "optimistic". When someone else | |
208 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
209 | * check at all. A more general error queue to queue errors for later handling | |
210 | * is probably better. | |
211 | */ | |
b61fafc4 | 212 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
213 | { |
214 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
18e1d836 WY |
215 | const u8 offset = iph->ihl << 2; |
216 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
7c657876 ACM |
217 | struct dccp_sock *dp; |
218 | struct inet_sock *inet; | |
88c7664f ACM |
219 | const int type = icmp_hdr(skb)->type; |
220 | const int code = icmp_hdr(skb)->code; | |
7c657876 ACM |
221 | struct sock *sk; |
222 | __u64 seq; | |
223 | int err; | |
fd54d716 | 224 | struct net *net = dev_net(skb->dev); |
7c657876 | 225 | |
18e1d836 WY |
226 | if (skb->len < offset + sizeof(*dh) || |
227 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
dcfc23ca | 228 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
229 | return; |
230 | } | |
231 | ||
fd54d716 | 232 | sk = inet_lookup(net, &dccp_hashinfo, |
b9901a84 PE |
233 | iph->daddr, dh->dccph_dport, |
234 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
7c657876 | 235 | if (sk == NULL) { |
dcfc23ca | 236 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
237 | return; |
238 | } | |
239 | ||
240 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 241 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
242 | return; |
243 | } | |
244 | ||
245 | bh_lock_sock(sk); | |
246 | /* If too many ICMPs get dropped on busy | |
247 | * servers this needs to be solved differently. | |
248 | */ | |
249 | if (sock_owned_by_user(sk)) | |
de0744af | 250 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
7c657876 ACM |
251 | |
252 | if (sk->sk_state == DCCP_CLOSED) | |
253 | goto out; | |
254 | ||
255 | dp = dccp_sk(sk); | |
fde20105 | 256 | seq = dccp_hdr_seq(dh); |
1238d087 | 257 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
d68f0866 | 258 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { |
de0744af | 259 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
260 | goto out; |
261 | } | |
262 | ||
263 | switch (type) { | |
55be7a9c DM |
264 | case ICMP_REDIRECT: |
265 | dccp_do_redirect(skb, sk); | |
266 | goto out; | |
7c657876 ACM |
267 | case ICMP_SOURCE_QUENCH: |
268 | /* Just silently ignore these. */ | |
269 | goto out; | |
270 | case ICMP_PARAMETERPROB: | |
271 | err = EPROTO; | |
272 | break; | |
273 | case ICMP_DEST_UNREACH: | |
274 | if (code > NR_ICMP_UNREACH) | |
275 | goto out; | |
276 | ||
277 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
278 | if (!sock_owned_by_user(sk)) | |
279 | dccp_do_pmtu_discovery(sk, iph, info); | |
280 | goto out; | |
281 | } | |
282 | ||
283 | err = icmp_err_convert[code].errno; | |
284 | break; | |
285 | case ICMP_TIME_EXCEEDED: | |
286 | err = EHOSTUNREACH; | |
287 | break; | |
288 | default: | |
289 | goto out; | |
290 | } | |
291 | ||
292 | switch (sk->sk_state) { | |
293 | struct request_sock *req , **prev; | |
294 | case DCCP_LISTEN: | |
295 | if (sock_owned_by_user(sk)) | |
296 | goto out; | |
297 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
298 | iph->daddr, iph->saddr); | |
299 | if (!req) | |
300 | goto out; | |
301 | ||
302 | /* | |
303 | * ICMPs are not backlogged, hence we cannot get an established | |
304 | * socket here. | |
305 | */ | |
547b792c | 306 | WARN_ON(req->sk); |
7c657876 | 307 | |
f541fb7e SJ |
308 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
309 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 310 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
311 | goto out; |
312 | } | |
313 | /* | |
314 | * Still in RESPOND, just remove it silently. | |
315 | * There is no good way to pass the error to the newly | |
316 | * created socket, and POSIX does not want network | |
317 | * errors returned from accept(). | |
318 | */ | |
319 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
320 | goto out; | |
321 | ||
322 | case DCCP_REQUESTING: | |
323 | case DCCP_RESPOND: | |
324 | if (!sock_owned_by_user(sk)) { | |
325 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
326 | sk->sk_err = err; | |
327 | ||
328 | sk->sk_error_report(sk); | |
329 | ||
330 | dccp_done(sk); | |
331 | } else | |
332 | sk->sk_err_soft = err; | |
333 | goto out; | |
334 | } | |
335 | ||
336 | /* If we've already connected we will keep trying | |
337 | * until we time out, or the user gives up. | |
338 | * | |
339 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
340 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
341 | * but it is obsoleted by pmtu discovery). | |
342 | * | |
343 | * Note, that in modern internet, where routing is unreliable | |
344 | * and in each dark corner broken firewalls sit, sending random | |
345 | * errors ordered by their masters even this two messages finally lose | |
346 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
347 | * | |
348 | * Now we are in compliance with RFCs. | |
349 | * --ANK (980905) | |
350 | */ | |
351 | ||
352 | inet = inet_sk(sk); | |
353 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
354 | sk->sk_err = err; | |
355 | sk->sk_error_report(sk); | |
356 | } else /* Only an error on timeout */ | |
357 | sk->sk_err_soft = err; | |
358 | out: | |
359 | bh_unlock_sock(sk); | |
360 | sock_put(sk); | |
361 | } | |
362 | ||
2bda2853 | 363 | static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
364 | __be32 src, __be32 dst) |
365 | { | |
366 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
367 | } | |
368 | ||
bb296246 | 369 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
57cca05a ACM |
370 | { |
371 | const struct inet_sock *inet = inet_sk(sk); | |
372 | struct dccp_hdr *dh = dccp_hdr(skb); | |
373 | ||
6f4e5fff | 374 | dccp_csum_outgoing(skb); |
c720c7e8 ED |
375 | dh->dccph_checksum = dccp_v4_csum_finish(skb, |
376 | inet->inet_saddr, | |
377 | inet->inet_daddr); | |
57cca05a ACM |
378 | } |
379 | ||
f21e68ca ACM |
380 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
381 | ||
865e9022 | 382 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 | 383 | { |
eddc9ec5 ACM |
384 | return secure_dccp_sequence_number(ip_hdr(skb)->daddr, |
385 | ip_hdr(skb)->saddr, | |
7c657876 ACM |
386 | dccp_hdr(skb)->dccph_dport, |
387 | dccp_hdr(skb)->dccph_sport); | |
388 | } | |
389 | ||
7c657876 ACM |
390 | /* |
391 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
392 | * now create the new socket. | |
393 | * | |
394 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
395 | */ | |
396 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
397 | struct request_sock *req, | |
398 | struct dst_entry *dst) | |
399 | { | |
400 | struct inet_request_sock *ireq; | |
401 | struct inet_sock *newinet; | |
7c657876 ACM |
402 | struct sock *newsk; |
403 | ||
404 | if (sk_acceptq_is_full(sk)) | |
405 | goto exit_overflow; | |
406 | ||
7c657876 ACM |
407 | newsk = dccp_create_openreq_child(sk, req, skb); |
408 | if (newsk == NULL) | |
093d2823 | 409 | goto exit_nonewsk; |
7c657876 | 410 | |
7c657876 ACM |
411 | newinet = inet_sk(newsk); |
412 | ireq = inet_rsk(req); | |
634fb979 ED |
413 | newinet->inet_daddr = ireq->ir_rmt_addr; |
414 | newinet->inet_rcv_saddr = ireq->ir_loc_addr; | |
415 | newinet->inet_saddr = ireq->ir_loc_addr; | |
f6d8bd05 | 416 | newinet->inet_opt = ireq->opt; |
7c657876 ACM |
417 | ireq->opt = NULL; |
418 | newinet->mc_index = inet_iif(skb); | |
eddc9ec5 | 419 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
c720c7e8 | 420 | newinet->inet_id = jiffies; |
7c657876 | 421 | |
0e734419 DM |
422 | if (dst == NULL && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL) |
423 | goto put_and_exit; | |
424 | ||
425 | sk_setup_caps(newsk, dst); | |
426 | ||
7c657876 ACM |
427 | dccp_sync_mss(newsk, dst_mtu(dst)); |
428 | ||
0e734419 DM |
429 | if (__inet_inherit_port(sk, newsk) < 0) |
430 | goto put_and_exit; | |
9327f705 | 431 | __inet_hash_nolisten(newsk, NULL); |
7c657876 ACM |
432 | |
433 | return newsk; | |
434 | ||
435 | exit_overflow: | |
de0744af | 436 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
437 | exit_nonewsk: |
438 | dst_release(dst); | |
7c657876 | 439 | exit: |
de0744af | 440 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
7c657876 | 441 | return NULL; |
0e734419 | 442 | put_and_exit: |
e337e24d CP |
443 | inet_csk_prepare_forced_close(newsk); |
444 | dccp_done(newsk); | |
0e734419 | 445 | goto exit; |
7c657876 ACM |
446 | } |
447 | ||
f21e68ca ACM |
448 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
449 | ||
7c657876 ACM |
450 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
451 | { | |
452 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
eddc9ec5 | 453 | const struct iphdr *iph = ip_hdr(skb); |
7c657876 ACM |
454 | struct sock *nsk; |
455 | struct request_sock **prev; | |
456 | /* Find possible connection requests. */ | |
457 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
458 | dh->dccph_sport, | |
459 | iph->saddr, iph->daddr); | |
460 | if (req != NULL) | |
461 | return dccp_check_req(sk, skb, req, prev); | |
462 | ||
b9901a84 | 463 | nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo, |
8f491069 HX |
464 | iph->saddr, dh->dccph_sport, |
465 | iph->daddr, dh->dccph_dport, | |
466 | inet_iif(skb)); | |
7c657876 ACM |
467 | if (nsk != NULL) { |
468 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
469 | bh_lock_sock(nsk); | |
470 | return nsk; | |
471 | } | |
9469c7b4 | 472 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
473 | return NULL; |
474 | } | |
475 | ||
476 | return sk; | |
477 | } | |
478 | ||
f5487398 | 479 | static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk, |
7c657876 ACM |
480 | struct sk_buff *skb) |
481 | { | |
482 | struct rtable *rt; | |
898f7358 | 483 | const struct iphdr *iph = ip_hdr(skb); |
9d6ec938 | 484 | struct flowi4 fl4 = { |
92101b3b | 485 | .flowi4_oif = inet_iif(skb), |
898f7358 DM |
486 | .daddr = iph->saddr, |
487 | .saddr = iph->daddr, | |
9d6ec938 DM |
488 | .flowi4_tos = RT_CONN_FLAGS(sk), |
489 | .flowi4_proto = sk->sk_protocol, | |
9cce96df DM |
490 | .fl4_sport = dccp_hdr(skb)->dccph_dport, |
491 | .fl4_dport = dccp_hdr(skb)->dccph_sport, | |
1d28f42c | 492 | }; |
7c657876 | 493 | |
9d6ec938 DM |
494 | security_skb_classify_flow(skb, flowi4_to_flowi(&fl4)); |
495 | rt = ip_route_output_flow(net, &fl4, sk); | |
b23dd4fe | 496 | if (IS_ERR(rt)) { |
7c73a6fa | 497 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
7c657876 ACM |
498 | return NULL; |
499 | } | |
500 | ||
d8d1f30b | 501 | return &rt->dst; |
7c657876 ACM |
502 | } |
503 | ||
1a2c6181 | 504 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req) |
3d2fe62b GR |
505 | { |
506 | int err = -1; | |
507 | struct sk_buff *skb; | |
fd80eb94 | 508 | struct dst_entry *dst; |
6bd023f3 | 509 | struct flowi4 fl4; |
3d2fe62b | 510 | |
ba3f7f04 | 511 | dst = inet_csk_route_req(sk, &fl4, req); |
fd80eb94 | 512 | if (dst == NULL) |
3d2fe62b GR |
513 | goto out; |
514 | ||
515 | skb = dccp_make_response(sk, dst, req); | |
516 | if (skb != NULL) { | |
517 | const struct inet_request_sock *ireq = inet_rsk(req); | |
518 | struct dccp_hdr *dh = dccp_hdr(skb); | |
519 | ||
634fb979 ED |
520 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->ir_loc_addr, |
521 | ireq->ir_rmt_addr); | |
522 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, | |
523 | ireq->ir_rmt_addr, | |
3d2fe62b | 524 | ireq->opt); |
b9df3cb8 | 525 | err = net_xmit_eval(err); |
3d2fe62b GR |
526 | } |
527 | ||
528 | out: | |
529 | dst_release(dst); | |
530 | return err; | |
531 | } | |
532 | ||
cfb6eeb4 | 533 | static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
7c657876 ACM |
534 | { |
535 | int err; | |
eddc9ec5 | 536 | const struct iphdr *rxiph; |
7c657876 ACM |
537 | struct sk_buff *skb; |
538 | struct dst_entry *dst; | |
adf30907 | 539 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
b76c4b27 | 540 | struct sock *ctl_sk = net->dccp.v4_ctl_sk; |
7c657876 ACM |
541 | |
542 | /* Never send a reset in response to a reset. */ | |
e356d37a | 543 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
7c657876 ACM |
544 | return; |
545 | ||
511c3f92 | 546 | if (skb_rtable(rxskb)->rt_type != RTN_LOCAL) |
7c657876 ACM |
547 | return; |
548 | ||
f5487398 | 549 | dst = dccp_v4_route_skb(net, ctl_sk, rxskb); |
7c657876 ACM |
550 | if (dst == NULL) |
551 | return; | |
552 | ||
7b1cffa8 | 553 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
7c657876 ACM |
554 | if (skb == NULL) |
555 | goto out; | |
556 | ||
eddc9ec5 | 557 | rxiph = ip_hdr(rxskb); |
e356d37a GR |
558 | dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr, |
559 | rxiph->daddr); | |
adf30907 | 560 | skb_dst_set(skb, dst_clone(dst)); |
7c657876 | 561 | |
7b1cffa8 PE |
562 | bh_lock_sock(ctl_sk); |
563 | err = ip_build_and_send_pkt(skb, ctl_sk, | |
eddc9ec5 | 564 | rxiph->daddr, rxiph->saddr, NULL); |
7b1cffa8 | 565 | bh_unlock_sock(ctl_sk); |
7c657876 | 566 | |
b9df3cb8 | 567 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
568 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
569 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
570 | } | |
571 | out: | |
572 | dst_release(dst); | |
573 | } | |
574 | ||
3d2fe62b GR |
575 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
576 | { | |
d99a7bd2 | 577 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3d2fe62b GR |
578 | kfree(inet_rsk(req)->opt); |
579 | } | |
580 | ||
c72e1183 ED |
581 | void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req) |
582 | { | |
583 | } | |
584 | EXPORT_SYMBOL(dccp_syn_ack_timeout); | |
585 | ||
3d2fe62b GR |
586 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { |
587 | .family = PF_INET, | |
588 | .obj_size = sizeof(struct dccp_request_sock), | |
589 | .rtx_syn_ack = dccp_v4_send_response, | |
590 | .send_ack = dccp_reqsk_send_ack, | |
591 | .destructor = dccp_v4_reqsk_destructor, | |
592 | .send_reset = dccp_v4_ctl_send_reset, | |
c72e1183 | 593 | .syn_ack_timeout = dccp_syn_ack_timeout, |
3d2fe62b GR |
594 | }; |
595 | ||
596 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
597 | { | |
598 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
599 | struct request_sock *req; |
600 | struct dccp_request_sock *dreq; | |
8109b02b | 601 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3d2fe62b | 602 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3d2fe62b GR |
603 | |
604 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
511c3f92 | 605 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
4a5409a5 | 606 | return 0; /* discard, don't send a reset here */ |
3d2fe62b GR |
607 | |
608 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 609 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3d2fe62b | 610 | goto drop; |
8109b02b | 611 | } |
3d2fe62b GR |
612 | /* |
613 | * TW buckets are converted to open requests without | |
614 | * limitations, they conserve resources and peer is | |
615 | * evidently real one. | |
616 | */ | |
4a5409a5 | 617 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3d2fe62b GR |
618 | if (inet_csk_reqsk_queue_is_full(sk)) |
619 | goto drop; | |
620 | ||
621 | /* | |
622 | * Accept backlog is full. If we have already queued enough | |
623 | * of warm entries in syn queue, drop request. It is better than | |
624 | * clogging syn queue with openreqs with exponentially increasing | |
625 | * timeout. | |
626 | */ | |
627 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
628 | goto drop; | |
629 | ||
ce4a7d0d | 630 | req = inet_reqsk_alloc(&dccp_request_sock_ops); |
3d2fe62b GR |
631 | if (req == NULL) |
632 | goto drop; | |
633 | ||
ac75773c GR |
634 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
635 | goto drop_and_free; | |
3d2fe62b | 636 | |
8b819412 GR |
637 | dreq = dccp_rsk(req); |
638 | if (dccp_parse_options(sk, dreq, skb)) | |
639 | goto drop_and_free; | |
640 | ||
3d2fe62b GR |
641 | if (security_inet_conn_request(sk, skb, req)) |
642 | goto drop_and_free; | |
643 | ||
644 | ireq = inet_rsk(req); | |
634fb979 ED |
645 | ireq->ir_loc_addr = ip_hdr(skb)->daddr; |
646 | ireq->ir_rmt_addr = ip_hdr(skb)->saddr; | |
3d2fe62b | 647 | |
8109b02b | 648 | /* |
3d2fe62b GR |
649 | * Step 3: Process LISTEN state |
650 | * | |
651 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
652 | * | |
f541fb7e | 653 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3d2fe62b | 654 | */ |
3d2fe62b | 655 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 656 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 657 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
f541fb7e | 658 | dreq->dreq_gss = dreq->dreq_iss; |
3d2fe62b GR |
659 | dreq->dreq_service = service; |
660 | ||
1a2c6181 | 661 | if (dccp_v4_send_response(sk, req)) |
3d2fe62b GR |
662 | goto drop_and_free; |
663 | ||
664 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
665 | return 0; | |
666 | ||
667 | drop_and_free: | |
668 | reqsk_free(req); | |
669 | drop: | |
670 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3d2fe62b GR |
671 | return -1; |
672 | } | |
673 | ||
674 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
675 | ||
7c657876 ACM |
676 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
677 | { | |
678 | struct dccp_hdr *dh = dccp_hdr(skb); | |
679 | ||
680 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
681 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
682 | goto reset; | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Step 3: Process LISTEN state | |
d83ca5ac GR |
688 | * If P.type == Request or P contains a valid Init Cookie option, |
689 | * (* Must scan the packet's options to check for Init | |
690 | * Cookies. Only Init Cookies are processed here, | |
691 | * however; other options are processed in Step 8. This | |
692 | * scan need only be performed if the endpoint uses Init | |
693 | * Cookies *) | |
694 | * (* Generate a new socket and switch to that socket *) | |
695 | * Set S := new socket for this port pair | |
696 | * S.state = RESPOND | |
697 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
698 | * Initialize S.GAR := S.ISS | |
699 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
700 | * Continue with S.state == RESPOND | |
701 | * (* A Response packet will be generated in Step 11 *) | |
702 | * Otherwise, | |
703 | * Generate Reset(No Connection) unless P.type == Reset | |
704 | * Drop packet and return | |
7c657876 | 705 | * |
7690af3f ACM |
706 | * NOTE: the check for the packet types is done in |
707 | * dccp_rcv_state_process | |
7c657876 ACM |
708 | */ |
709 | if (sk->sk_state == DCCP_LISTEN) { | |
710 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
711 | ||
712 | if (nsk == NULL) | |
713 | goto discard; | |
714 | ||
715 | if (nsk != sk) { | |
716 | if (dccp_child_process(sk, nsk, skb)) | |
717 | goto reset; | |
718 | return 0; | |
719 | } | |
720 | } | |
721 | ||
722 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
723 | goto reset; | |
724 | return 0; | |
725 | ||
726 | reset: | |
cfb6eeb4 | 727 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
728 | discard: |
729 | kfree_skb(skb); | |
730 | return 0; | |
731 | } | |
732 | ||
f21e68ca ACM |
733 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
734 | ||
09dbc389 GR |
735 | /** |
736 | * dccp_invalid_packet - check for malformed packets | |
737 | * Implements RFC 4340, 8.5: Step 1: Check header basics | |
738 | * Packets that fail these checks are ignored and do not receive Resets. | |
739 | */ | |
f21e68ca | 740 | int dccp_invalid_packet(struct sk_buff *skb) |
7c657876 ACM |
741 | { |
742 | const struct dccp_hdr *dh; | |
6f4e5fff | 743 | unsigned int cscov; |
7c657876 ACM |
744 | |
745 | if (skb->pkt_type != PACKET_HOST) | |
746 | return 1; | |
747 | ||
09dbc389 | 748 | /* If the packet is shorter than 12 bytes, drop packet and return */ |
7c657876 | 749 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { |
59348b19 | 750 | DCCP_WARN("pskb_may_pull failed\n"); |
7c657876 ACM |
751 | return 1; |
752 | } | |
753 | ||
754 | dh = dccp_hdr(skb); | |
755 | ||
09dbc389 | 756 | /* If P.type is not understood, drop packet and return */ |
7c657876 | 757 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
59348b19 | 758 | DCCP_WARN("invalid packet type\n"); |
7c657876 ACM |
759 | return 1; |
760 | } | |
761 | ||
762 | /* | |
09dbc389 | 763 | * If P.Data Offset is too small for packet type, drop packet and return |
7c657876 ACM |
764 | */ |
765 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
59348b19 | 766 | DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff); |
7c657876 ACM |
767 | return 1; |
768 | } | |
09dbc389 GR |
769 | /* |
770 | * If P.Data Offset is too too large for packet, drop packet and return | |
771 | */ | |
7c657876 | 772 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
59348b19 | 773 | DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff); |
7c657876 ACM |
774 | return 1; |
775 | } | |
776 | ||
7c657876 ACM |
777 | /* |
778 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
779 | * has short sequence numbers), drop packet and return | |
780 | */ | |
6079a463 WY |
781 | if ((dh->dccph_type < DCCP_PKT_DATA || |
782 | dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0) { | |
59348b19 GR |
783 | DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n", |
784 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
785 | return 1; |
786 | } | |
787 | ||
6f4e5fff GR |
788 | /* |
789 | * If P.CsCov is too large for the packet size, drop packet and return. | |
790 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
791 | */ | |
792 | cscov = dccp_csum_coverage(skb); | |
793 | if (cscov > skb->len) { | |
59348b19 GR |
794 | DCCP_WARN("P.CsCov %u exceeds packet length %d\n", |
795 | dh->dccph_cscov, skb->len); | |
6f4e5fff GR |
796 | return 1; |
797 | } | |
798 | ||
799 | /* If header checksum is incorrect, drop packet and return. | |
800 | * (This step is completed in the AF-dependent functions.) */ | |
801 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
802 | ||
7c657876 ACM |
803 | return 0; |
804 | } | |
805 | ||
f21e68ca ACM |
806 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
807 | ||
7c657876 | 808 | /* this is called when real data arrives */ |
b61fafc4 | 809 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
810 | { |
811 | const struct dccp_hdr *dh; | |
eddc9ec5 | 812 | const struct iphdr *iph; |
7c657876 | 813 | struct sock *sk; |
6f4e5fff | 814 | int min_cov; |
7c657876 | 815 | |
6f4e5fff | 816 | /* Step 1: Check header basics */ |
7c657876 ACM |
817 | |
818 | if (dccp_invalid_packet(skb)) | |
819 | goto discard_it; | |
820 | ||
eddc9ec5 | 821 | iph = ip_hdr(skb); |
6f4e5fff | 822 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
eddc9ec5 | 823 | if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) { |
59348b19 | 824 | DCCP_WARN("dropped packet with invalid checksum\n"); |
f21e68ca ACM |
825 | goto discard_it; |
826 | } | |
827 | ||
7c657876 | 828 | dh = dccp_hdr(skb); |
7c657876 | 829 | |
fde20105 | 830 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
7c657876 ACM |
831 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
832 | ||
21454aaa | 833 | dccp_pr_debug("%8.8s src=%pI4@%-5d dst=%pI4@%-5d seq=%llu", |
7c657876 | 834 | dccp_packet_name(dh->dccph_type), |
21454aaa HH |
835 | &iph->saddr, ntohs(dh->dccph_sport), |
836 | &iph->daddr, ntohs(dh->dccph_dport), | |
f6ccf554 | 837 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
838 | |
839 | if (dccp_packet_without_ack(skb)) { | |
840 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
841 | dccp_pr_debug_cat("\n"); | |
842 | } else { | |
843 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 844 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 845 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
846 | } |
847 | ||
848 | /* Step 2: | |
8109b02b | 849 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
850 | sk = __inet_lookup_skb(&dccp_hashinfo, skb, |
851 | dh->dccph_sport, dh->dccph_dport); | |
8109b02b | 852 | /* |
7c657876 | 853 | * Step 2: |
8109b02b | 854 | * If no socket ... |
7c657876 ACM |
855 | */ |
856 | if (sk == NULL) { | |
857 | dccp_pr_debug("failed to look up flow ID in table and " | |
858 | "get corresponding socket\n"); | |
859 | goto no_dccp_socket; | |
860 | } | |
861 | ||
8109b02b | 862 | /* |
7c657876 | 863 | * Step 2: |
8109b02b | 864 | * ... or S.state == TIMEWAIT, |
7c657876 ACM |
865 | * Generate Reset(No Connection) unless P.type == Reset |
866 | * Drop packet and return | |
867 | */ | |
7c657876 | 868 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
869 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
870 | inet_twsk_put(inet_twsk(sk)); | |
871 | goto no_dccp_socket; | |
7c657876 ACM |
872 | } |
873 | ||
6f4e5fff GR |
874 | /* |
875 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
876 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
877 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
878 | */ |
879 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
880 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
881 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
882 | dh->dccph_cscov, min_cov); | |
883 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
884 | * options (Section 11.7) with Drop Code 0, Protocol | |
885 | * Constraints." */ | |
886 | goto discard_and_relse; | |
887 | } | |
888 | ||
25995ff5 | 889 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 890 | goto discard_and_relse; |
eb9c7ebe | 891 | nf_reset(skb); |
7c657876 | 892 | |
58a5a7b9 | 893 | return sk_receive_skb(sk, skb, 1); |
7c657876 ACM |
894 | |
895 | no_dccp_socket: | |
896 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
897 | goto discard_it; | |
898 | /* | |
899 | * Step 2: | |
8109b02b | 900 | * If no socket ... |
7c657876 ACM |
901 | * Generate Reset(No Connection) unless P.type == Reset |
902 | * Drop packet and return | |
903 | */ | |
904 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
905 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
906 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 907 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
908 | } |
909 | ||
910 | discard_it: | |
7c657876 ACM |
911 | kfree_skb(skb); |
912 | return 0; | |
913 | ||
914 | discard_and_relse: | |
915 | sock_put(sk); | |
916 | goto discard_it; | |
917 | } | |
918 | ||
3b401a81 | 919 | static const struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
920 | .queue_xmit = ip_queue_xmit, |
921 | .send_check = dccp_v4_send_check, | |
922 | .rebuild_header = inet_sk_rebuild_header, | |
923 | .conn_request = dccp_v4_conn_request, | |
924 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
925 | .net_header_len = sizeof(struct iphdr), | |
926 | .setsockopt = ip_setsockopt, | |
927 | .getsockopt = ip_getsockopt, | |
928 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
929 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 930 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 931 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
932 | .compat_setsockopt = compat_ip_setsockopt, |
933 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 934 | #endif |
57cca05a ACM |
935 | }; |
936 | ||
3e0fadc5 | 937 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 938 | { |
72478873 ACM |
939 | static __u8 dccp_v4_ctl_sock_initialized; |
940 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 941 | |
72478873 ACM |
942 | if (err == 0) { |
943 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
944 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 945 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
946 | } |
947 | ||
3e0fadc5 | 948 | return err; |
7c657876 ACM |
949 | } |
950 | ||
6d6ee43e ACM |
951 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
952 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
953 | }; | |
954 | ||
5e0817f8 | 955 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
956 | .name = "DCCP", |
957 | .owner = THIS_MODULE, | |
958 | .close = dccp_close, | |
959 | .connect = dccp_v4_connect, | |
960 | .disconnect = dccp_disconnect, | |
961 | .ioctl = dccp_ioctl, | |
962 | .init = dccp_v4_init_sock, | |
963 | .setsockopt = dccp_setsockopt, | |
964 | .getsockopt = dccp_getsockopt, | |
965 | .sendmsg = dccp_sendmsg, | |
966 | .recvmsg = dccp_recvmsg, | |
967 | .backlog_rcv = dccp_v4_do_rcv, | |
ab1e0a13 ACM |
968 | .hash = inet_hash, |
969 | .unhash = inet_unhash, | |
7c657876 | 970 | .accept = inet_csk_accept, |
ab1e0a13 | 971 | .get_port = inet_csk_get_port, |
7c657876 | 972 | .shutdown = dccp_shutdown, |
3e0fadc5 | 973 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
974 | .orphan_count = &dccp_orphan_count, |
975 | .max_header = MAX_DCCP_HEADER, | |
976 | .obj_size = sizeof(struct dccp_sock), | |
3ab5aee7 | 977 | .slab_flags = SLAB_DESTROY_BY_RCU, |
7c657876 | 978 | .rsk_prot = &dccp_request_sock_ops, |
6d6ee43e | 979 | .twsk_prot = &dccp_timewait_sock_ops, |
39d8cda7 | 980 | .h.hashinfo = &dccp_hashinfo, |
543d9cfe ACM |
981 | #ifdef CONFIG_COMPAT |
982 | .compat_setsockopt = compat_dccp_setsockopt, | |
983 | .compat_getsockopt = compat_dccp_getsockopt, | |
984 | #endif | |
7c657876 | 985 | }; |
6d6ee43e | 986 | |
32613090 | 987 | static const struct net_protocol dccp_v4_protocol = { |
b61fafc4 ACM |
988 | .handler = dccp_v4_rcv, |
989 | .err_handler = dccp_v4_err, | |
990 | .no_policy = 1, | |
fc5f8580 | 991 | .netns_ok = 1, |
8ed1dc44 | 992 | .icmp_strict_tag_validation = 1, |
b61fafc4 ACM |
993 | }; |
994 | ||
995 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
996 | .family = PF_INET, |
997 | .owner = THIS_MODULE, | |
998 | .release = inet_release, | |
999 | .bind = inet_bind, | |
1000 | .connect = inet_stream_connect, | |
1001 | .socketpair = sock_no_socketpair, | |
1002 | .accept = inet_accept, | |
1003 | .getname = inet_getname, | |
b61fafc4 | 1004 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1005 | .poll = dccp_poll, |
1006 | .ioctl = inet_ioctl, | |
b61fafc4 | 1007 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1008 | .listen = inet_dccp_listen, |
1009 | .shutdown = inet_shutdown, | |
1010 | .setsockopt = sock_common_setsockopt, | |
1011 | .getsockopt = sock_common_getsockopt, | |
1012 | .sendmsg = inet_sendmsg, | |
1013 | .recvmsg = sock_common_recvmsg, | |
1014 | .mmap = sock_no_mmap, | |
1015 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1016 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1017 | .compat_setsockopt = compat_sock_common_setsockopt, |
1018 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1019 | #endif |
b61fafc4 ACM |
1020 | }; |
1021 | ||
1022 | static struct inet_protosw dccp_v4_protosw = { | |
1023 | .type = SOCK_DCCP, | |
1024 | .protocol = IPPROTO_DCCP, | |
1025 | .prot = &dccp_v4_prot, | |
1026 | .ops = &inet_dccp_ops, | |
b61fafc4 ACM |
1027 | .flags = INET_PROTOSW_ICSK, |
1028 | }; | |
1029 | ||
2c8c1e72 | 1030 | static int __net_init dccp_v4_init_net(struct net *net) |
72a2d613 | 1031 | { |
d14a0ebd GR |
1032 | if (dccp_hashinfo.bhash == NULL) |
1033 | return -ESOCKTNOSUPPORT; | |
b76c4b27 | 1034 | |
d14a0ebd GR |
1035 | return inet_ctl_sock_create(&net->dccp.v4_ctl_sk, PF_INET, |
1036 | SOCK_DCCP, IPPROTO_DCCP, net); | |
72a2d613 PE |
1037 | } |
1038 | ||
2c8c1e72 | 1039 | static void __net_exit dccp_v4_exit_net(struct net *net) |
72a2d613 | 1040 | { |
b76c4b27 | 1041 | inet_ctl_sock_destroy(net->dccp.v4_ctl_sk); |
72a2d613 PE |
1042 | } |
1043 | ||
1044 | static struct pernet_operations dccp_v4_ops = { | |
1045 | .init = dccp_v4_init_net, | |
1046 | .exit = dccp_v4_exit_net, | |
1047 | }; | |
1048 | ||
b61fafc4 ACM |
1049 | static int __init dccp_v4_init(void) |
1050 | { | |
1051 | int err = proto_register(&dccp_v4_prot, 1); | |
1052 | ||
1053 | if (err != 0) | |
1054 | goto out; | |
1055 | ||
1056 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1057 | if (err != 0) | |
1058 | goto out_proto_unregister; | |
1059 | ||
1060 | inet_register_protosw(&dccp_v4_protosw); | |
1061 | ||
72a2d613 PE |
1062 | err = register_pernet_subsys(&dccp_v4_ops); |
1063 | if (err) | |
1064 | goto out_destroy_ctl_sock; | |
b61fafc4 ACM |
1065 | out: |
1066 | return err; | |
72a2d613 | 1067 | out_destroy_ctl_sock: |
b61fafc4 ACM |
1068 | inet_unregister_protosw(&dccp_v4_protosw); |
1069 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1070 | out_proto_unregister: | |
1071 | proto_unregister(&dccp_v4_prot); | |
1072 | goto out; | |
1073 | } | |
1074 | ||
1075 | static void __exit dccp_v4_exit(void) | |
1076 | { | |
72a2d613 | 1077 | unregister_pernet_subsys(&dccp_v4_ops); |
b61fafc4 ACM |
1078 | inet_unregister_protosw(&dccp_v4_protosw); |
1079 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1080 | proto_unregister(&dccp_v4_prot); | |
1081 | } | |
1082 | ||
1083 | module_init(dccp_v4_init); | |
1084 | module_exit(dccp_v4_exit); | |
1085 | ||
1086 | /* | |
1087 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1088 | * values directly, Also cover the case where the protocol is not specified, | |
1089 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1090 | */ | |
7131c6c7 JD |
1091 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 33, 6); |
1092 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 0, 6); | |
b61fafc4 ACM |
1093 | MODULE_LICENSE("GPL"); |
1094 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1095 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |