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, | |
78 | orig_sport, orig_dport, sk, true); | |
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 && | |
d83d8461 | 177 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
178 | dccp_sync_mss(sk, mtu); |
179 | ||
180 | /* | |
0e64e94e | 181 | * From RFC 4340, sec. 14.1: |
7c657876 | 182 | * |
7690af3f ACM |
183 | * DCCP-Sync packets are the best choice for upward |
184 | * probing, since DCCP-Sync probes do not risk application | |
185 | * data loss. | |
7c657876 | 186 | */ |
e92ae93a | 187 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
188 | } /* else let the usual retransmit timer handle it */ |
189 | } | |
190 | ||
55be7a9c DM |
191 | static void dccp_do_redirect(struct sk_buff *skb, struct sock *sk) |
192 | { | |
193 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
194 | ||
1ed5c48f | 195 | if (dst) |
6700c270 | 196 | dst->ops->redirect(dst, sk, skb); |
55be7a9c DM |
197 | } |
198 | ||
7c657876 ACM |
199 | /* |
200 | * This routine is called by the ICMP module when it gets some sort of error | |
201 | * condition. If err < 0 then the socket should be closed and the error | |
202 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
203 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
204 | * need to find the appropriate port. | |
205 | * | |
206 | * The locking strategy used here is very "optimistic". When someone else | |
207 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
208 | * check at all. A more general error queue to queue errors for later handling | |
209 | * is probably better. | |
210 | */ | |
b61fafc4 | 211 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
212 | { |
213 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
18e1d836 | 214 | const u8 offset = iph->ihl << 2; |
261def57 | 215 | const struct dccp_hdr *dh; |
7c657876 ACM |
216 | struct dccp_sock *dp; |
217 | struct inet_sock *inet; | |
88c7664f ACM |
218 | const int type = icmp_hdr(skb)->type; |
219 | const int code = icmp_hdr(skb)->code; | |
7c657876 ACM |
220 | struct sock *sk; |
221 | __u64 seq; | |
222 | int err; | |
fd54d716 | 223 | struct net *net = dev_net(skb->dev); |
7c657876 | 224 | |
261def57 ED |
225 | /* Only need dccph_dport & dccph_sport which are the first |
226 | * 4 bytes in dccp header. | |
227 | * Our caller (icmp_socket_deliver()) already pulled 8 bytes for us. | |
228 | */ | |
229 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); | |
230 | BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); | |
231 | dh = (struct dccp_hdr *)(skb->data + offset); | |
7c657876 | 232 | |
fd54d716 | 233 | sk = inet_lookup(net, &dccp_hashinfo, |
b9901a84 PE |
234 | iph->daddr, dh->dccph_dport, |
235 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
7c657876 | 236 | if (sk == NULL) { |
dcfc23ca | 237 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
238 | return; |
239 | } | |
240 | ||
241 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 242 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
243 | return; |
244 | } | |
245 | ||
246 | bh_lock_sock(sk); | |
247 | /* If too many ICMPs get dropped on busy | |
248 | * servers this needs to be solved differently. | |
249 | */ | |
250 | if (sock_owned_by_user(sk)) | |
de0744af | 251 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
7c657876 ACM |
252 | |
253 | if (sk->sk_state == DCCP_CLOSED) | |
254 | goto out; | |
255 | ||
256 | dp = dccp_sk(sk); | |
fde20105 | 257 | seq = dccp_hdr_seq(dh); |
1238d087 | 258 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
d68f0866 | 259 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { |
de0744af | 260 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
261 | goto out; |
262 | } | |
263 | ||
264 | switch (type) { | |
55be7a9c | 265 | case ICMP_REDIRECT: |
29c4bf40 JM |
266 | if (!sock_owned_by_user(sk)) |
267 | dccp_do_redirect(skb, sk); | |
55be7a9c | 268 | goto out; |
7c657876 ACM |
269 | case ICMP_SOURCE_QUENCH: |
270 | /* Just silently ignore these. */ | |
271 | goto out; | |
272 | case ICMP_PARAMETERPROB: | |
273 | err = EPROTO; | |
274 | break; | |
275 | case ICMP_DEST_UNREACH: | |
276 | if (code > NR_ICMP_UNREACH) | |
277 | goto out; | |
278 | ||
279 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
280 | if (!sock_owned_by_user(sk)) | |
281 | dccp_do_pmtu_discovery(sk, iph, info); | |
282 | goto out; | |
283 | } | |
284 | ||
285 | err = icmp_err_convert[code].errno; | |
286 | break; | |
287 | case ICMP_TIME_EXCEEDED: | |
288 | err = EHOSTUNREACH; | |
289 | break; | |
290 | default: | |
291 | goto out; | |
292 | } | |
293 | ||
294 | switch (sk->sk_state) { | |
295 | struct request_sock *req , **prev; | |
296 | case DCCP_LISTEN: | |
297 | if (sock_owned_by_user(sk)) | |
298 | goto out; | |
299 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
300 | iph->daddr, iph->saddr); | |
301 | if (!req) | |
302 | goto out; | |
303 | ||
304 | /* | |
305 | * ICMPs are not backlogged, hence we cannot get an established | |
306 | * socket here. | |
307 | */ | |
547b792c | 308 | WARN_ON(req->sk); |
7c657876 | 309 | |
f541fb7e SJ |
310 | if (!between48(seq, dccp_rsk(req)->dreq_iss, |
311 | dccp_rsk(req)->dreq_gss)) { | |
de0744af | 312 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
313 | goto out; |
314 | } | |
315 | /* | |
316 | * Still in RESPOND, just remove it silently. | |
317 | * There is no good way to pass the error to the newly | |
318 | * created socket, and POSIX does not want network | |
319 | * errors returned from accept(). | |
320 | */ | |
321 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
322 | goto out; | |
323 | ||
324 | case DCCP_REQUESTING: | |
325 | case DCCP_RESPOND: | |
326 | if (!sock_owned_by_user(sk)) { | |
327 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
328 | sk->sk_err = err; | |
329 | ||
330 | sk->sk_error_report(sk); | |
331 | ||
332 | dccp_done(sk); | |
333 | } else | |
334 | sk->sk_err_soft = err; | |
335 | goto out; | |
336 | } | |
337 | ||
338 | /* If we've already connected we will keep trying | |
339 | * until we time out, or the user gives up. | |
340 | * | |
341 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
342 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
343 | * but it is obsoleted by pmtu discovery). | |
344 | * | |
345 | * Note, that in modern internet, where routing is unreliable | |
346 | * and in each dark corner broken firewalls sit, sending random | |
347 | * errors ordered by their masters even this two messages finally lose | |
348 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
349 | * | |
350 | * Now we are in compliance with RFCs. | |
351 | * --ANK (980905) | |
352 | */ | |
353 | ||
354 | inet = inet_sk(sk); | |
355 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
356 | sk->sk_err = err; | |
357 | sk->sk_error_report(sk); | |
358 | } else /* Only an error on timeout */ | |
359 | sk->sk_err_soft = err; | |
360 | out: | |
361 | bh_unlock_sock(sk); | |
362 | sock_put(sk); | |
363 | } | |
364 | ||
2bda2853 | 365 | static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
366 | __be32 src, __be32 dst) |
367 | { | |
368 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
369 | } | |
370 | ||
bb296246 | 371 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
57cca05a ACM |
372 | { |
373 | const struct inet_sock *inet = inet_sk(sk); | |
374 | struct dccp_hdr *dh = dccp_hdr(skb); | |
375 | ||
6f4e5fff | 376 | dccp_csum_outgoing(skb); |
c720c7e8 ED |
377 | dh->dccph_checksum = dccp_v4_csum_finish(skb, |
378 | inet->inet_saddr, | |
379 | inet->inet_daddr); | |
57cca05a ACM |
380 | } |
381 | ||
f21e68ca ACM |
382 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
383 | ||
865e9022 | 384 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 | 385 | { |
eddc9ec5 ACM |
386 | return secure_dccp_sequence_number(ip_hdr(skb)->daddr, |
387 | ip_hdr(skb)->saddr, | |
7c657876 ACM |
388 | dccp_hdr(skb)->dccph_dport, |
389 | dccp_hdr(skb)->dccph_sport); | |
390 | } | |
391 | ||
7c657876 ACM |
392 | /* |
393 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
394 | * now create the new socket. | |
395 | * | |
396 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
397 | */ | |
398 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
399 | struct request_sock *req, | |
400 | struct dst_entry *dst) | |
401 | { | |
402 | struct inet_request_sock *ireq; | |
403 | struct inet_sock *newinet; | |
7c657876 ACM |
404 | struct sock *newsk; |
405 | ||
406 | if (sk_acceptq_is_full(sk)) | |
407 | goto exit_overflow; | |
408 | ||
7c657876 ACM |
409 | newsk = dccp_create_openreq_child(sk, req, skb); |
410 | if (newsk == NULL) | |
093d2823 | 411 | goto exit_nonewsk; |
7c657876 | 412 | |
7c657876 ACM |
413 | newinet = inet_sk(newsk); |
414 | ireq = inet_rsk(req); | |
c720c7e8 ED |
415 | newinet->inet_daddr = ireq->rmt_addr; |
416 | newinet->inet_rcv_saddr = ireq->loc_addr; | |
417 | newinet->inet_saddr = ireq->loc_addr; | |
f6d8bd05 | 418 | newinet->inet_opt = ireq->opt; |
7c657876 ACM |
419 | ireq->opt = NULL; |
420 | newinet->mc_index = inet_iif(skb); | |
eddc9ec5 | 421 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
c720c7e8 | 422 | newinet->inet_id = jiffies; |
7c657876 | 423 | |
0e734419 DM |
424 | if (dst == NULL && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL) |
425 | goto put_and_exit; | |
426 | ||
427 | sk_setup_caps(newsk, dst); | |
428 | ||
7c657876 ACM |
429 | dccp_sync_mss(newsk, dst_mtu(dst)); |
430 | ||
0e734419 DM |
431 | if (__inet_inherit_port(sk, newsk) < 0) |
432 | goto put_and_exit; | |
9327f705 | 433 | __inet_hash_nolisten(newsk, NULL); |
7c657876 ACM |
434 | |
435 | return newsk; | |
436 | ||
437 | exit_overflow: | |
de0744af | 438 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
439 | exit_nonewsk: |
440 | dst_release(dst); | |
7c657876 | 441 | exit: |
de0744af | 442 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
7c657876 | 443 | return NULL; |
0e734419 | 444 | put_and_exit: |
e337e24d CP |
445 | inet_csk_prepare_forced_close(newsk); |
446 | dccp_done(newsk); | |
0e734419 | 447 | goto exit; |
7c657876 ACM |
448 | } |
449 | ||
f21e68ca ACM |
450 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
451 | ||
7c657876 ACM |
452 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
453 | { | |
454 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
eddc9ec5 | 455 | const struct iphdr *iph = ip_hdr(skb); |
7c657876 ACM |
456 | struct sock *nsk; |
457 | struct request_sock **prev; | |
458 | /* Find possible connection requests. */ | |
459 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
460 | dh->dccph_sport, | |
461 | iph->saddr, iph->daddr); | |
462 | if (req != NULL) | |
463 | return dccp_check_req(sk, skb, req, prev); | |
464 | ||
b9901a84 | 465 | nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo, |
8f491069 HX |
466 | iph->saddr, dh->dccph_sport, |
467 | iph->daddr, dh->dccph_dport, | |
468 | inet_iif(skb)); | |
7c657876 ACM |
469 | if (nsk != NULL) { |
470 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
471 | bh_lock_sock(nsk); | |
472 | return nsk; | |
473 | } | |
9469c7b4 | 474 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
475 | return NULL; |
476 | } | |
477 | ||
478 | return sk; | |
479 | } | |
480 | ||
f5487398 | 481 | static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk, |
7c657876 ACM |
482 | struct sk_buff *skb) |
483 | { | |
484 | struct rtable *rt; | |
898f7358 | 485 | const struct iphdr *iph = ip_hdr(skb); |
9d6ec938 | 486 | struct flowi4 fl4 = { |
92101b3b | 487 | .flowi4_oif = inet_iif(skb), |
898f7358 DM |
488 | .daddr = iph->saddr, |
489 | .saddr = iph->daddr, | |
9d6ec938 DM |
490 | .flowi4_tos = RT_CONN_FLAGS(sk), |
491 | .flowi4_proto = sk->sk_protocol, | |
9cce96df DM |
492 | .fl4_sport = dccp_hdr(skb)->dccph_dport, |
493 | .fl4_dport = dccp_hdr(skb)->dccph_sport, | |
1d28f42c | 494 | }; |
7c657876 | 495 | |
9d6ec938 DM |
496 | security_skb_classify_flow(skb, flowi4_to_flowi(&fl4)); |
497 | rt = ip_route_output_flow(net, &fl4, sk); | |
b23dd4fe | 498 | if (IS_ERR(rt)) { |
7c73a6fa | 499 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
7c657876 ACM |
500 | return NULL; |
501 | } | |
502 | ||
d8d1f30b | 503 | return &rt->dst; |
7c657876 ACM |
504 | } |
505 | ||
1a2c6181 | 506 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req) |
3d2fe62b GR |
507 | { |
508 | int err = -1; | |
509 | struct sk_buff *skb; | |
fd80eb94 | 510 | struct dst_entry *dst; |
6bd023f3 | 511 | struct flowi4 fl4; |
3d2fe62b | 512 | |
ba3f7f04 | 513 | dst = inet_csk_route_req(sk, &fl4, req); |
fd80eb94 | 514 | if (dst == NULL) |
3d2fe62b GR |
515 | goto out; |
516 | ||
517 | skb = dccp_make_response(sk, dst, req); | |
518 | if (skb != NULL) { | |
519 | const struct inet_request_sock *ireq = inet_rsk(req); | |
520 | struct dccp_hdr *dh = dccp_hdr(skb); | |
521 | ||
6f4e5fff GR |
522 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->loc_addr, |
523 | ireq->rmt_addr); | |
3d2fe62b GR |
524 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
525 | ireq->rmt_addr, | |
526 | ireq->opt); | |
b9df3cb8 | 527 | err = net_xmit_eval(err); |
3d2fe62b GR |
528 | } |
529 | ||
530 | out: | |
531 | dst_release(dst); | |
532 | return err; | |
533 | } | |
534 | ||
cfb6eeb4 | 535 | static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
7c657876 ACM |
536 | { |
537 | int err; | |
eddc9ec5 | 538 | const struct iphdr *rxiph; |
7c657876 ACM |
539 | struct sk_buff *skb; |
540 | struct dst_entry *dst; | |
adf30907 | 541 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
b76c4b27 | 542 | struct sock *ctl_sk = net->dccp.v4_ctl_sk; |
7c657876 ACM |
543 | |
544 | /* Never send a reset in response to a reset. */ | |
e356d37a | 545 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
7c657876 ACM |
546 | return; |
547 | ||
511c3f92 | 548 | if (skb_rtable(rxskb)->rt_type != RTN_LOCAL) |
7c657876 ACM |
549 | return; |
550 | ||
f5487398 | 551 | dst = dccp_v4_route_skb(net, ctl_sk, rxskb); |
7c657876 ACM |
552 | if (dst == NULL) |
553 | return; | |
554 | ||
7b1cffa8 | 555 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
7c657876 ACM |
556 | if (skb == NULL) |
557 | goto out; | |
558 | ||
eddc9ec5 | 559 | rxiph = ip_hdr(rxskb); |
e356d37a GR |
560 | dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr, |
561 | rxiph->daddr); | |
adf30907 | 562 | skb_dst_set(skb, dst_clone(dst)); |
7c657876 | 563 | |
7b1cffa8 PE |
564 | bh_lock_sock(ctl_sk); |
565 | err = ip_build_and_send_pkt(skb, ctl_sk, | |
eddc9ec5 | 566 | rxiph->daddr, rxiph->saddr, NULL); |
7b1cffa8 | 567 | bh_unlock_sock(ctl_sk); |
7c657876 | 568 | |
b9df3cb8 | 569 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
570 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
571 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
572 | } | |
573 | out: | |
574 | dst_release(dst); | |
575 | } | |
576 | ||
3d2fe62b GR |
577 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
578 | { | |
d99a7bd2 | 579 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3d2fe62b GR |
580 | kfree(inet_rsk(req)->opt); |
581 | } | |
582 | ||
c72e1183 ED |
583 | void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req) |
584 | { | |
585 | } | |
586 | EXPORT_SYMBOL(dccp_syn_ack_timeout); | |
587 | ||
3d2fe62b GR |
588 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { |
589 | .family = PF_INET, | |
590 | .obj_size = sizeof(struct dccp_request_sock), | |
591 | .rtx_syn_ack = dccp_v4_send_response, | |
592 | .send_ack = dccp_reqsk_send_ack, | |
593 | .destructor = dccp_v4_reqsk_destructor, | |
594 | .send_reset = dccp_v4_ctl_send_reset, | |
c72e1183 | 595 | .syn_ack_timeout = dccp_syn_ack_timeout, |
3d2fe62b GR |
596 | }; |
597 | ||
598 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
599 | { | |
600 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
601 | struct request_sock *req; |
602 | struct dccp_request_sock *dreq; | |
8109b02b | 603 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3d2fe62b | 604 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3d2fe62b GR |
605 | |
606 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
511c3f92 | 607 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
4a5409a5 | 608 | return 0; /* discard, don't send a reset here */ |
3d2fe62b GR |
609 | |
610 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 611 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3d2fe62b | 612 | goto drop; |
8109b02b | 613 | } |
3d2fe62b GR |
614 | /* |
615 | * TW buckets are converted to open requests without | |
616 | * limitations, they conserve resources and peer is | |
617 | * evidently real one. | |
618 | */ | |
4a5409a5 | 619 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3d2fe62b GR |
620 | if (inet_csk_reqsk_queue_is_full(sk)) |
621 | goto drop; | |
622 | ||
623 | /* | |
624 | * Accept backlog is full. If we have already queued enough | |
625 | * of warm entries in syn queue, drop request. It is better than | |
626 | * clogging syn queue with openreqs with exponentially increasing | |
627 | * timeout. | |
628 | */ | |
629 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
630 | goto drop; | |
631 | ||
ce4a7d0d | 632 | req = inet_reqsk_alloc(&dccp_request_sock_ops); |
3d2fe62b GR |
633 | if (req == NULL) |
634 | goto drop; | |
635 | ||
ac75773c GR |
636 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
637 | goto drop_and_free; | |
3d2fe62b | 638 | |
8b819412 GR |
639 | dreq = dccp_rsk(req); |
640 | if (dccp_parse_options(sk, dreq, skb)) | |
641 | goto drop_and_free; | |
642 | ||
3d2fe62b GR |
643 | if (security_inet_conn_request(sk, skb, req)) |
644 | goto drop_and_free; | |
645 | ||
646 | ireq = inet_rsk(req); | |
eddc9ec5 ACM |
647 | ireq->loc_addr = ip_hdr(skb)->daddr; |
648 | ireq->rmt_addr = ip_hdr(skb)->saddr; | |
3d2fe62b | 649 | |
8109b02b | 650 | /* |
3d2fe62b GR |
651 | * Step 3: Process LISTEN state |
652 | * | |
653 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
654 | * | |
f541fb7e | 655 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
3d2fe62b | 656 | */ |
3d2fe62b | 657 | dreq->dreq_isr = dcb->dccpd_seq; |
f541fb7e | 658 | dreq->dreq_gsr = dreq->dreq_isr; |
865e9022 | 659 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
f541fb7e | 660 | dreq->dreq_gss = dreq->dreq_iss; |
3d2fe62b GR |
661 | dreq->dreq_service = service; |
662 | ||
1a2c6181 | 663 | if (dccp_v4_send_response(sk, req)) |
3d2fe62b GR |
664 | goto drop_and_free; |
665 | ||
666 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
667 | return 0; | |
668 | ||
669 | drop_and_free: | |
670 | reqsk_free(req); | |
671 | drop: | |
672 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3d2fe62b GR |
673 | return -1; |
674 | } | |
675 | ||
676 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
677 | ||
7c657876 ACM |
678 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
679 | { | |
680 | struct dccp_hdr *dh = dccp_hdr(skb); | |
681 | ||
682 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
683 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
684 | goto reset; | |
685 | return 0; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Step 3: Process LISTEN state | |
d83ca5ac GR |
690 | * If P.type == Request or P contains a valid Init Cookie option, |
691 | * (* Must scan the packet's options to check for Init | |
692 | * Cookies. Only Init Cookies are processed here, | |
693 | * however; other options are processed in Step 8. This | |
694 | * scan need only be performed if the endpoint uses Init | |
695 | * Cookies *) | |
696 | * (* Generate a new socket and switch to that socket *) | |
697 | * Set S := new socket for this port pair | |
698 | * S.state = RESPOND | |
699 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
700 | * Initialize S.GAR := S.ISS | |
701 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
702 | * Continue with S.state == RESPOND | |
703 | * (* A Response packet will be generated in Step 11 *) | |
704 | * Otherwise, | |
705 | * Generate Reset(No Connection) unless P.type == Reset | |
706 | * Drop packet and return | |
7c657876 | 707 | * |
7690af3f ACM |
708 | * NOTE: the check for the packet types is done in |
709 | * dccp_rcv_state_process | |
7c657876 ACM |
710 | */ |
711 | if (sk->sk_state == DCCP_LISTEN) { | |
712 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
713 | ||
714 | if (nsk == NULL) | |
715 | goto discard; | |
716 | ||
717 | if (nsk != sk) { | |
718 | if (dccp_child_process(sk, nsk, skb)) | |
719 | goto reset; | |
720 | return 0; | |
721 | } | |
722 | } | |
723 | ||
724 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
725 | goto reset; | |
726 | return 0; | |
727 | ||
728 | reset: | |
cfb6eeb4 | 729 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
730 | discard: |
731 | kfree_skb(skb); | |
732 | return 0; | |
733 | } | |
734 | ||
f21e68ca ACM |
735 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
736 | ||
09dbc389 GR |
737 | /** |
738 | * dccp_invalid_packet - check for malformed packets | |
739 | * Implements RFC 4340, 8.5: Step 1: Check header basics | |
740 | * Packets that fail these checks are ignored and do not receive Resets. | |
741 | */ | |
f21e68ca | 742 | int dccp_invalid_packet(struct sk_buff *skb) |
7c657876 ACM |
743 | { |
744 | const struct dccp_hdr *dh; | |
6f4e5fff | 745 | unsigned int cscov; |
7c657876 ACM |
746 | |
747 | if (skb->pkt_type != PACKET_HOST) | |
748 | return 1; | |
749 | ||
09dbc389 | 750 | /* If the packet is shorter than 12 bytes, drop packet and return */ |
7c657876 | 751 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { |
59348b19 | 752 | DCCP_WARN("pskb_may_pull failed\n"); |
7c657876 ACM |
753 | return 1; |
754 | } | |
755 | ||
756 | dh = dccp_hdr(skb); | |
757 | ||
09dbc389 | 758 | /* If P.type is not understood, drop packet and return */ |
7c657876 | 759 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
59348b19 | 760 | DCCP_WARN("invalid packet type\n"); |
7c657876 ACM |
761 | return 1; |
762 | } | |
763 | ||
764 | /* | |
09dbc389 | 765 | * If P.Data Offset is too small for packet type, drop packet and return |
7c657876 ACM |
766 | */ |
767 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
59348b19 | 768 | DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff); |
7c657876 ACM |
769 | return 1; |
770 | } | |
09dbc389 GR |
771 | /* |
772 | * If P.Data Offset is too too large for packet, drop packet and return | |
773 | */ | |
7c657876 | 774 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
59348b19 | 775 | DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff); |
7c657876 ACM |
776 | return 1; |
777 | } | |
778 | ||
7c657876 ACM |
779 | /* |
780 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
781 | * has short sequence numbers), drop packet and return | |
782 | */ | |
6079a463 WY |
783 | if ((dh->dccph_type < DCCP_PKT_DATA || |
784 | dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0) { | |
59348b19 GR |
785 | DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n", |
786 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
787 | return 1; |
788 | } | |
789 | ||
6f4e5fff GR |
790 | /* |
791 | * If P.CsCov is too large for the packet size, drop packet and return. | |
792 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
793 | */ | |
794 | cscov = dccp_csum_coverage(skb); | |
795 | if (cscov > skb->len) { | |
59348b19 GR |
796 | DCCP_WARN("P.CsCov %u exceeds packet length %d\n", |
797 | dh->dccph_cscov, skb->len); | |
6f4e5fff GR |
798 | return 1; |
799 | } | |
800 | ||
801 | /* If header checksum is incorrect, drop packet and return. | |
802 | * (This step is completed in the AF-dependent functions.) */ | |
803 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
804 | ||
7c657876 ACM |
805 | return 0; |
806 | } | |
807 | ||
f21e68ca ACM |
808 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
809 | ||
7c657876 | 810 | /* this is called when real data arrives */ |
b61fafc4 | 811 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
812 | { |
813 | const struct dccp_hdr *dh; | |
eddc9ec5 | 814 | const struct iphdr *iph; |
7c657876 | 815 | struct sock *sk; |
6f4e5fff | 816 | int min_cov; |
7c657876 | 817 | |
6f4e5fff | 818 | /* Step 1: Check header basics */ |
7c657876 ACM |
819 | |
820 | if (dccp_invalid_packet(skb)) | |
821 | goto discard_it; | |
822 | ||
eddc9ec5 | 823 | iph = ip_hdr(skb); |
6f4e5fff | 824 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
eddc9ec5 | 825 | if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) { |
59348b19 | 826 | DCCP_WARN("dropped packet with invalid checksum\n"); |
f21e68ca ACM |
827 | goto discard_it; |
828 | } | |
829 | ||
7c657876 | 830 | dh = dccp_hdr(skb); |
7c657876 | 831 | |
fde20105 | 832 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
7c657876 ACM |
833 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
834 | ||
21454aaa | 835 | dccp_pr_debug("%8.8s src=%pI4@%-5d dst=%pI4@%-5d seq=%llu", |
7c657876 | 836 | dccp_packet_name(dh->dccph_type), |
21454aaa HH |
837 | &iph->saddr, ntohs(dh->dccph_sport), |
838 | &iph->daddr, ntohs(dh->dccph_dport), | |
f6ccf554 | 839 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
840 | |
841 | if (dccp_packet_without_ack(skb)) { | |
842 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
843 | dccp_pr_debug_cat("\n"); | |
844 | } else { | |
845 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 846 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 847 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
848 | } |
849 | ||
850 | /* Step 2: | |
8109b02b | 851 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
852 | sk = __inet_lookup_skb(&dccp_hashinfo, skb, |
853 | dh->dccph_sport, dh->dccph_dport); | |
8109b02b | 854 | /* |
7c657876 | 855 | * Step 2: |
8109b02b | 856 | * If no socket ... |
7c657876 ACM |
857 | */ |
858 | if (sk == NULL) { | |
859 | dccp_pr_debug("failed to look up flow ID in table and " | |
860 | "get corresponding socket\n"); | |
861 | goto no_dccp_socket; | |
862 | } | |
863 | ||
8109b02b | 864 | /* |
7c657876 | 865 | * Step 2: |
8109b02b | 866 | * ... or S.state == TIMEWAIT, |
7c657876 ACM |
867 | * Generate Reset(No Connection) unless P.type == Reset |
868 | * Drop packet and return | |
869 | */ | |
7c657876 | 870 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
871 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
872 | inet_twsk_put(inet_twsk(sk)); | |
873 | goto no_dccp_socket; | |
7c657876 ACM |
874 | } |
875 | ||
6f4e5fff GR |
876 | /* |
877 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
878 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
879 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
880 | */ |
881 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
882 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
883 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
884 | dh->dccph_cscov, min_cov); | |
885 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
886 | * options (Section 11.7) with Drop Code 0, Protocol | |
887 | * Constraints." */ | |
888 | goto discard_and_relse; | |
889 | } | |
890 | ||
25995ff5 | 891 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 892 | goto discard_and_relse; |
eb9c7ebe | 893 | nf_reset(skb); |
7c657876 | 894 | |
58a5a7b9 | 895 | return sk_receive_skb(sk, skb, 1); |
7c657876 ACM |
896 | |
897 | no_dccp_socket: | |
898 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
899 | goto discard_it; | |
900 | /* | |
901 | * Step 2: | |
8109b02b | 902 | * If no socket ... |
7c657876 ACM |
903 | * Generate Reset(No Connection) unless P.type == Reset |
904 | * Drop packet and return | |
905 | */ | |
906 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
907 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
908 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 909 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
910 | } |
911 | ||
912 | discard_it: | |
7c657876 ACM |
913 | kfree_skb(skb); |
914 | return 0; | |
915 | ||
916 | discard_and_relse: | |
917 | sock_put(sk); | |
918 | goto discard_it; | |
919 | } | |
920 | ||
3b401a81 | 921 | static const struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
922 | .queue_xmit = ip_queue_xmit, |
923 | .send_check = dccp_v4_send_check, | |
924 | .rebuild_header = inet_sk_rebuild_header, | |
925 | .conn_request = dccp_v4_conn_request, | |
926 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
927 | .net_header_len = sizeof(struct iphdr), | |
928 | .setsockopt = ip_setsockopt, | |
929 | .getsockopt = ip_getsockopt, | |
930 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
931 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 932 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 933 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
934 | .compat_setsockopt = compat_ip_setsockopt, |
935 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 936 | #endif |
57cca05a ACM |
937 | }; |
938 | ||
3e0fadc5 | 939 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 940 | { |
72478873 ACM |
941 | static __u8 dccp_v4_ctl_sock_initialized; |
942 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 943 | |
72478873 ACM |
944 | if (err == 0) { |
945 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
946 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 947 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
948 | } |
949 | ||
3e0fadc5 | 950 | return err; |
7c657876 ACM |
951 | } |
952 | ||
6d6ee43e ACM |
953 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
954 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
955 | }; | |
956 | ||
5e0817f8 | 957 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
958 | .name = "DCCP", |
959 | .owner = THIS_MODULE, | |
960 | .close = dccp_close, | |
961 | .connect = dccp_v4_connect, | |
962 | .disconnect = dccp_disconnect, | |
963 | .ioctl = dccp_ioctl, | |
964 | .init = dccp_v4_init_sock, | |
965 | .setsockopt = dccp_setsockopt, | |
966 | .getsockopt = dccp_getsockopt, | |
967 | .sendmsg = dccp_sendmsg, | |
968 | .recvmsg = dccp_recvmsg, | |
969 | .backlog_rcv = dccp_v4_do_rcv, | |
ab1e0a13 ACM |
970 | .hash = inet_hash, |
971 | .unhash = inet_unhash, | |
7c657876 | 972 | .accept = inet_csk_accept, |
ab1e0a13 | 973 | .get_port = inet_csk_get_port, |
7c657876 | 974 | .shutdown = dccp_shutdown, |
3e0fadc5 | 975 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
976 | .orphan_count = &dccp_orphan_count, |
977 | .max_header = MAX_DCCP_HEADER, | |
978 | .obj_size = sizeof(struct dccp_sock), | |
3ab5aee7 | 979 | .slab_flags = SLAB_DESTROY_BY_RCU, |
7c657876 | 980 | .rsk_prot = &dccp_request_sock_ops, |
6d6ee43e | 981 | .twsk_prot = &dccp_timewait_sock_ops, |
39d8cda7 | 982 | .h.hashinfo = &dccp_hashinfo, |
543d9cfe ACM |
983 | #ifdef CONFIG_COMPAT |
984 | .compat_setsockopt = compat_dccp_setsockopt, | |
985 | .compat_getsockopt = compat_dccp_getsockopt, | |
986 | #endif | |
7c657876 | 987 | }; |
6d6ee43e | 988 | |
32613090 | 989 | static const struct net_protocol dccp_v4_protocol = { |
b61fafc4 ACM |
990 | .handler = dccp_v4_rcv, |
991 | .err_handler = dccp_v4_err, | |
992 | .no_policy = 1, | |
fc5f8580 | 993 | .netns_ok = 1, |
b61fafc4 ACM |
994 | }; |
995 | ||
996 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
997 | .family = PF_INET, |
998 | .owner = THIS_MODULE, | |
999 | .release = inet_release, | |
1000 | .bind = inet_bind, | |
1001 | .connect = inet_stream_connect, | |
1002 | .socketpair = sock_no_socketpair, | |
1003 | .accept = inet_accept, | |
1004 | .getname = inet_getname, | |
b61fafc4 | 1005 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1006 | .poll = dccp_poll, |
1007 | .ioctl = inet_ioctl, | |
b61fafc4 | 1008 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1009 | .listen = inet_dccp_listen, |
1010 | .shutdown = inet_shutdown, | |
1011 | .setsockopt = sock_common_setsockopt, | |
1012 | .getsockopt = sock_common_getsockopt, | |
1013 | .sendmsg = inet_sendmsg, | |
1014 | .recvmsg = sock_common_recvmsg, | |
1015 | .mmap = sock_no_mmap, | |
1016 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1017 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1018 | .compat_setsockopt = compat_sock_common_setsockopt, |
1019 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1020 | #endif |
b61fafc4 ACM |
1021 | }; |
1022 | ||
1023 | static struct inet_protosw dccp_v4_protosw = { | |
1024 | .type = SOCK_DCCP, | |
1025 | .protocol = IPPROTO_DCCP, | |
1026 | .prot = &dccp_v4_prot, | |
1027 | .ops = &inet_dccp_ops, | |
b61fafc4 ACM |
1028 | .no_check = 0, |
1029 | .flags = INET_PROTOSW_ICSK, | |
1030 | }; | |
1031 | ||
2c8c1e72 | 1032 | static int __net_init dccp_v4_init_net(struct net *net) |
72a2d613 | 1033 | { |
d14a0ebd GR |
1034 | if (dccp_hashinfo.bhash == NULL) |
1035 | return -ESOCKTNOSUPPORT; | |
b76c4b27 | 1036 | |
d14a0ebd GR |
1037 | return inet_ctl_sock_create(&net->dccp.v4_ctl_sk, PF_INET, |
1038 | SOCK_DCCP, IPPROTO_DCCP, net); | |
72a2d613 PE |
1039 | } |
1040 | ||
2c8c1e72 | 1041 | static void __net_exit dccp_v4_exit_net(struct net *net) |
72a2d613 | 1042 | { |
b76c4b27 | 1043 | inet_ctl_sock_destroy(net->dccp.v4_ctl_sk); |
72a2d613 PE |
1044 | } |
1045 | ||
1046 | static struct pernet_operations dccp_v4_ops = { | |
1047 | .init = dccp_v4_init_net, | |
1048 | .exit = dccp_v4_exit_net, | |
1049 | }; | |
1050 | ||
b61fafc4 ACM |
1051 | static int __init dccp_v4_init(void) |
1052 | { | |
1053 | int err = proto_register(&dccp_v4_prot, 1); | |
1054 | ||
1055 | if (err != 0) | |
1056 | goto out; | |
1057 | ||
1058 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1059 | if (err != 0) | |
1060 | goto out_proto_unregister; | |
1061 | ||
1062 | inet_register_protosw(&dccp_v4_protosw); | |
1063 | ||
72a2d613 PE |
1064 | err = register_pernet_subsys(&dccp_v4_ops); |
1065 | if (err) | |
1066 | goto out_destroy_ctl_sock; | |
b61fafc4 ACM |
1067 | out: |
1068 | return err; | |
72a2d613 | 1069 | out_destroy_ctl_sock: |
b61fafc4 ACM |
1070 | inet_unregister_protosw(&dccp_v4_protosw); |
1071 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1072 | out_proto_unregister: | |
1073 | proto_unregister(&dccp_v4_prot); | |
1074 | goto out; | |
1075 | } | |
1076 | ||
1077 | static void __exit dccp_v4_exit(void) | |
1078 | { | |
72a2d613 | 1079 | unregister_pernet_subsys(&dccp_v4_ops); |
b61fafc4 ACM |
1080 | inet_unregister_protosw(&dccp_v4_protosw); |
1081 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1082 | proto_unregister(&dccp_v4_prot); | |
1083 | } | |
1084 | ||
1085 | module_init(dccp_v4_init); | |
1086 | module_exit(dccp_v4_exit); | |
1087 | ||
1088 | /* | |
1089 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1090 | * values directly, Also cover the case where the protocol is not specified, | |
1091 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1092 | */ | |
7131c6c7 JD |
1093 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 33, 6); |
1094 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 0, 6); | |
b61fafc4 ACM |
1095 | MODULE_LICENSE("GPL"); |
1096 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1097 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |