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> | |
15 | #include <linux/module.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/random.h> | |
18 | ||
19 | #include <net/icmp.h> | |
b61fafc4 | 20 | #include <net/inet_common.h> |
7c657876 | 21 | #include <net/inet_hashtables.h> |
14c85021 | 22 | #include <net/inet_sock.h> |
b61fafc4 | 23 | #include <net/protocol.h> |
7c657876 | 24 | #include <net/sock.h> |
6d6ee43e | 25 | #include <net/timewait_sock.h> |
7c657876 ACM |
26 | #include <net/tcp_states.h> |
27 | #include <net/xfrm.h> | |
28 | ||
ae31c339 | 29 | #include "ackvec.h" |
7c657876 ACM |
30 | #include "ccid.h" |
31 | #include "dccp.h" | |
afe00251 | 32 | #include "feat.h" |
7c657876 | 33 | |
72478873 ACM |
34 | /* |
35 | * This is the global socket data structure used for responding to | |
36 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
37 | * for this socket at the initialization time. | |
38 | */ | |
39 | static struct socket *dccp_v4_ctl_socket; | |
40 | ||
f21e68ca | 41 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 ACM |
42 | { |
43 | struct inet_sock *inet = inet_sk(sk); | |
44 | struct dccp_sock *dp = dccp_sk(sk); | |
45 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
46 | struct rtable *rt; | |
bada8adc | 47 | __be32 daddr, nexthop; |
7c657876 ACM |
48 | int tmp; |
49 | int err; | |
50 | ||
51 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
52 | ||
53 | if (addr_len < sizeof(struct sockaddr_in)) | |
54 | return -EINVAL; | |
55 | ||
56 | if (usin->sin_family != AF_INET) | |
57 | return -EAFNOSUPPORT; | |
58 | ||
59 | nexthop = daddr = usin->sin_addr.s_addr; | |
60 | if (inet->opt != NULL && inet->opt->srr) { | |
61 | if (daddr == 0) | |
62 | return -EINVAL; | |
63 | nexthop = inet->opt->faddr; | |
64 | } | |
65 | ||
66 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
67 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
68 | IPPROTO_DCCP, | |
8eb9086f | 69 | inet->sport, usin->sin_port, sk, 1); |
7c657876 ACM |
70 | if (tmp < 0) |
71 | return tmp; | |
72 | ||
73 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
74 | ip_rt_put(rt); | |
75 | return -ENETUNREACH; | |
76 | } | |
77 | ||
78 | if (inet->opt == NULL || !inet->opt->srr) | |
79 | daddr = rt->rt_dst; | |
80 | ||
81 | if (inet->saddr == 0) | |
82 | inet->saddr = rt->rt_src; | |
83 | inet->rcv_saddr = inet->saddr; | |
84 | ||
85 | inet->dport = usin->sin_port; | |
86 | inet->daddr = daddr; | |
87 | ||
d83d8461 | 88 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 89 | if (inet->opt != NULL) |
d83d8461 | 90 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
91 | /* |
92 | * Socket identity is still unknown (sport may be zero). | |
93 | * However we set state to DCCP_REQUESTING and not releasing socket | |
94 | * lock select source port, enter ourselves into the hash tables and | |
95 | * complete initialization after this. | |
96 | */ | |
97 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 98 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
99 | if (err != 0) |
100 | goto failure; | |
101 | ||
5d39a795 | 102 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport, |
c9eaf173 | 103 | sk); |
7c657876 ACM |
104 | if (err != 0) |
105 | goto failure; | |
106 | ||
107 | /* OK, now commit destination to socket. */ | |
108 | sk_setup_caps(sk, &rt->u.dst); | |
109 | ||
d7f7365f GR |
110 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, inet->daddr, |
111 | inet->sport, inet->dport); | |
7c657876 ACM |
112 | inet->id = dp->dccps_iss ^ jiffies; |
113 | ||
114 | err = dccp_connect(sk); | |
115 | rt = NULL; | |
116 | if (err != 0) | |
117 | goto failure; | |
118 | out: | |
119 | return err; | |
120 | failure: | |
7690af3f ACM |
121 | /* |
122 | * This unhashes the socket and releases the local port, if necessary. | |
123 | */ | |
7c657876 ACM |
124 | dccp_set_state(sk, DCCP_CLOSED); |
125 | ip_rt_put(rt); | |
126 | sk->sk_route_caps = 0; | |
127 | inet->dport = 0; | |
128 | goto out; | |
129 | } | |
130 | ||
f21e68ca ACM |
131 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
132 | ||
7c657876 ACM |
133 | /* |
134 | * This routine does path mtu discovery as defined in RFC1191. | |
135 | */ | |
136 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
137 | const struct iphdr *iph, | |
138 | u32 mtu) | |
139 | { | |
140 | struct dst_entry *dst; | |
141 | const struct inet_sock *inet = inet_sk(sk); | |
142 | const struct dccp_sock *dp = dccp_sk(sk); | |
143 | ||
144 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
145 | * send out by Linux are always < 576bytes so they should go through | |
146 | * unfragmented). | |
147 | */ | |
148 | if (sk->sk_state == DCCP_LISTEN) | |
149 | return; | |
150 | ||
151 | /* We don't check in the destentry if pmtu discovery is forbidden | |
152 | * on this route. We just assume that no packet_to_big packets | |
153 | * are send back when pmtu discovery is not active. | |
c9eaf173 | 154 | * There is a small race when the user changes this flag in the |
7c657876 ACM |
155 | * route, but I think that's acceptable. |
156 | */ | |
157 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
158 | return; | |
159 | ||
160 | dst->ops->update_pmtu(dst, mtu); | |
161 | ||
162 | /* Something is about to be wrong... Remember soft error | |
163 | * for the case, if this connection will not able to recover. | |
164 | */ | |
165 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
166 | sk->sk_err_soft = EMSGSIZE; | |
167 | ||
168 | mtu = dst_mtu(dst); | |
169 | ||
170 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 171 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
172 | dccp_sync_mss(sk, mtu); |
173 | ||
174 | /* | |
0e64e94e | 175 | * From RFC 4340, sec. 14.1: |
7c657876 | 176 | * |
7690af3f ACM |
177 | * DCCP-Sync packets are the best choice for upward |
178 | * probing, since DCCP-Sync probes do not risk application | |
179 | * data loss. | |
7c657876 | 180 | */ |
e92ae93a | 181 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
182 | } /* else let the usual retransmit timer handle it */ |
183 | } | |
184 | ||
7c657876 ACM |
185 | /* |
186 | * This routine is called by the ICMP module when it gets some sort of error | |
187 | * condition. If err < 0 then the socket should be closed and the error | |
188 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
189 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
190 | * need to find the appropriate port. | |
191 | * | |
192 | * The locking strategy used here is very "optimistic". When someone else | |
193 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
194 | * check at all. A more general error queue to queue errors for later handling | |
195 | * is probably better. | |
196 | */ | |
b61fafc4 | 197 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
198 | { |
199 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
200 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
201 | (iph->ihl << 2)); | |
7c657876 ACM |
202 | struct dccp_sock *dp; |
203 | struct inet_sock *inet; | |
88c7664f ACM |
204 | const int type = icmp_hdr(skb)->type; |
205 | const int code = icmp_hdr(skb)->code; | |
7c657876 ACM |
206 | struct sock *sk; |
207 | __u64 seq; | |
208 | int err; | |
209 | ||
210 | if (skb->len < (iph->ihl << 2) + 8) { | |
211 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
212 | return; | |
213 | } | |
214 | ||
c67499c0 | 215 | sk = inet_lookup(&init_net, &dccp_hashinfo, iph->daddr, dh->dccph_dport, |
7c657876 ACM |
216 | iph->saddr, dh->dccph_sport, inet_iif(skb)); |
217 | if (sk == NULL) { | |
218 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
219 | return; | |
220 | } | |
221 | ||
222 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 223 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
224 | return; |
225 | } | |
226 | ||
227 | bh_lock_sock(sk); | |
228 | /* If too many ICMPs get dropped on busy | |
229 | * servers this needs to be solved differently. | |
230 | */ | |
231 | if (sock_owned_by_user(sk)) | |
232 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
233 | ||
234 | if (sk->sk_state == DCCP_CLOSED) | |
235 | goto out; | |
236 | ||
237 | dp = dccp_sk(sk); | |
fde20105 | 238 | seq = dccp_hdr_seq(dh); |
1238d087 | 239 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
7c657876 | 240 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { |
e523a155 | 241 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
242 | goto out; |
243 | } | |
244 | ||
245 | switch (type) { | |
246 | case ICMP_SOURCE_QUENCH: | |
247 | /* Just silently ignore these. */ | |
248 | goto out; | |
249 | case ICMP_PARAMETERPROB: | |
250 | err = EPROTO; | |
251 | break; | |
252 | case ICMP_DEST_UNREACH: | |
253 | if (code > NR_ICMP_UNREACH) | |
254 | goto out; | |
255 | ||
256 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
257 | if (!sock_owned_by_user(sk)) | |
258 | dccp_do_pmtu_discovery(sk, iph, info); | |
259 | goto out; | |
260 | } | |
261 | ||
262 | err = icmp_err_convert[code].errno; | |
263 | break; | |
264 | case ICMP_TIME_EXCEEDED: | |
265 | err = EHOSTUNREACH; | |
266 | break; | |
267 | default: | |
268 | goto out; | |
269 | } | |
270 | ||
271 | switch (sk->sk_state) { | |
272 | struct request_sock *req , **prev; | |
273 | case DCCP_LISTEN: | |
274 | if (sock_owned_by_user(sk)) | |
275 | goto out; | |
276 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
277 | iph->daddr, iph->saddr); | |
278 | if (!req) | |
279 | goto out; | |
280 | ||
281 | /* | |
282 | * ICMPs are not backlogged, hence we cannot get an established | |
283 | * socket here. | |
284 | */ | |
285 | BUG_TRAP(!req->sk); | |
286 | ||
287 | if (seq != dccp_rsk(req)->dreq_iss) { | |
288 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
289 | goto out; | |
290 | } | |
291 | /* | |
292 | * Still in RESPOND, just remove it silently. | |
293 | * There is no good way to pass the error to the newly | |
294 | * created socket, and POSIX does not want network | |
295 | * errors returned from accept(). | |
296 | */ | |
297 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
298 | goto out; | |
299 | ||
300 | case DCCP_REQUESTING: | |
301 | case DCCP_RESPOND: | |
302 | if (!sock_owned_by_user(sk)) { | |
303 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
304 | sk->sk_err = err; | |
305 | ||
306 | sk->sk_error_report(sk); | |
307 | ||
308 | dccp_done(sk); | |
309 | } else | |
310 | sk->sk_err_soft = err; | |
311 | goto out; | |
312 | } | |
313 | ||
314 | /* If we've already connected we will keep trying | |
315 | * until we time out, or the user gives up. | |
316 | * | |
317 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
318 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
319 | * but it is obsoleted by pmtu discovery). | |
320 | * | |
321 | * Note, that in modern internet, where routing is unreliable | |
322 | * and in each dark corner broken firewalls sit, sending random | |
323 | * errors ordered by their masters even this two messages finally lose | |
324 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
325 | * | |
326 | * Now we are in compliance with RFCs. | |
327 | * --ANK (980905) | |
328 | */ | |
329 | ||
330 | inet = inet_sk(sk); | |
331 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
332 | sk->sk_err = err; | |
333 | sk->sk_error_report(sk); | |
334 | } else /* Only an error on timeout */ | |
335 | sk->sk_err_soft = err; | |
336 | out: | |
337 | bh_unlock_sock(sk); | |
338 | sock_put(sk); | |
339 | } | |
340 | ||
2bda2853 | 341 | static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
342 | __be32 src, __be32 dst) |
343 | { | |
344 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
345 | } | |
346 | ||
347 | void dccp_v4_send_check(struct sock *sk, int unused, struct sk_buff *skb) | |
57cca05a ACM |
348 | { |
349 | const struct inet_sock *inet = inet_sk(sk); | |
350 | struct dccp_hdr *dh = dccp_hdr(skb); | |
351 | ||
6f4e5fff GR |
352 | dccp_csum_outgoing(skb); |
353 | dh->dccph_checksum = dccp_v4_csum_finish(skb, inet->saddr, inet->daddr); | |
57cca05a ACM |
354 | } |
355 | ||
f21e68ca ACM |
356 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
357 | ||
865e9022 | 358 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 | 359 | { |
eddc9ec5 ACM |
360 | return secure_dccp_sequence_number(ip_hdr(skb)->daddr, |
361 | ip_hdr(skb)->saddr, | |
7c657876 ACM |
362 | dccp_hdr(skb)->dccph_dport, |
363 | dccp_hdr(skb)->dccph_sport); | |
364 | } | |
365 | ||
7c657876 ACM |
366 | /* |
367 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
368 | * now create the new socket. | |
369 | * | |
370 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
371 | */ | |
372 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
373 | struct request_sock *req, | |
374 | struct dst_entry *dst) | |
375 | { | |
376 | struct inet_request_sock *ireq; | |
377 | struct inet_sock *newinet; | |
7c657876 ACM |
378 | struct sock *newsk; |
379 | ||
380 | if (sk_acceptq_is_full(sk)) | |
381 | goto exit_overflow; | |
382 | ||
383 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
384 | goto exit; | |
385 | ||
386 | newsk = dccp_create_openreq_child(sk, req, skb); | |
387 | if (newsk == NULL) | |
388 | goto exit; | |
389 | ||
390 | sk_setup_caps(newsk, dst); | |
391 | ||
7c657876 ACM |
392 | newinet = inet_sk(newsk); |
393 | ireq = inet_rsk(req); | |
394 | newinet->daddr = ireq->rmt_addr; | |
395 | newinet->rcv_saddr = ireq->loc_addr; | |
396 | newinet->saddr = ireq->loc_addr; | |
397 | newinet->opt = ireq->opt; | |
398 | ireq->opt = NULL; | |
399 | newinet->mc_index = inet_iif(skb); | |
eddc9ec5 | 400 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
7c657876 ACM |
401 | newinet->id = jiffies; |
402 | ||
403 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
404 | ||
ab1e0a13 ACM |
405 | __inet_hash_nolisten(newsk); |
406 | __inet_inherit_port(sk, newsk); | |
7c657876 ACM |
407 | |
408 | return newsk; | |
409 | ||
410 | exit_overflow: | |
411 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
412 | exit: | |
413 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
414 | dst_release(dst); | |
415 | return NULL; | |
416 | } | |
417 | ||
f21e68ca ACM |
418 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
419 | ||
7c657876 ACM |
420 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
421 | { | |
422 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
eddc9ec5 | 423 | const struct iphdr *iph = ip_hdr(skb); |
7c657876 ACM |
424 | struct sock *nsk; |
425 | struct request_sock **prev; | |
426 | /* Find possible connection requests. */ | |
427 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
428 | dh->dccph_sport, | |
429 | iph->saddr, iph->daddr); | |
430 | if (req != NULL) | |
431 | return dccp_check_req(sk, skb, req, prev); | |
432 | ||
c67499c0 | 433 | nsk = inet_lookup_established(&init_net, &dccp_hashinfo, |
8f491069 HX |
434 | iph->saddr, dh->dccph_sport, |
435 | iph->daddr, dh->dccph_dport, | |
436 | inet_iif(skb)); | |
7c657876 ACM |
437 | if (nsk != NULL) { |
438 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
439 | bh_lock_sock(nsk); | |
440 | return nsk; | |
441 | } | |
9469c7b4 | 442 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
443 | return NULL; |
444 | } | |
445 | ||
446 | return sk; | |
447 | } | |
448 | ||
7c657876 ACM |
449 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, |
450 | struct sk_buff *skb) | |
451 | { | |
452 | struct rtable *rt; | |
453 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
454 | .nl_u = { .ip4_u = | |
eddc9ec5 ACM |
455 | { .daddr = ip_hdr(skb)->saddr, |
456 | .saddr = ip_hdr(skb)->daddr, | |
7c657876 ACM |
457 | .tos = RT_CONN_FLAGS(sk) } }, |
458 | .proto = sk->sk_protocol, | |
459 | .uli_u = { .ports = | |
460 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f | 461 | .dport = dccp_hdr(skb)->dccph_sport } |
8109b02b | 462 | } |
7690af3f | 463 | }; |
7c657876 | 464 | |
beb8d13b | 465 | security_skb_classify_flow(skb, &fl); |
f1b050bf | 466 | if (ip_route_output_flow(&init_net, &rt, &fl, sk, 0)) { |
7c657876 ACM |
467 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); |
468 | return NULL; | |
469 | } | |
470 | ||
471 | return &rt->u.dst; | |
472 | } | |
473 | ||
3d2fe62b GR |
474 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
475 | struct dst_entry *dst) | |
476 | { | |
477 | int err = -1; | |
478 | struct sk_buff *skb; | |
479 | ||
480 | /* First, grab a route. */ | |
c9eaf173 | 481 | |
3d2fe62b GR |
482 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) |
483 | goto out; | |
484 | ||
485 | skb = dccp_make_response(sk, dst, req); | |
486 | if (skb != NULL) { | |
487 | const struct inet_request_sock *ireq = inet_rsk(req); | |
488 | struct dccp_hdr *dh = dccp_hdr(skb); | |
489 | ||
6f4e5fff GR |
490 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->loc_addr, |
491 | ireq->rmt_addr); | |
3d2fe62b GR |
492 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
493 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, | |
494 | ireq->rmt_addr, | |
495 | ireq->opt); | |
b9df3cb8 | 496 | err = net_xmit_eval(err); |
3d2fe62b GR |
497 | } |
498 | ||
499 | out: | |
500 | dst_release(dst); | |
501 | return err; | |
502 | } | |
503 | ||
cfb6eeb4 | 504 | static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
7c657876 ACM |
505 | { |
506 | int err; | |
eddc9ec5 | 507 | const struct iphdr *rxiph; |
7c657876 ACM |
508 | struct sk_buff *skb; |
509 | struct dst_entry *dst; | |
510 | ||
511 | /* Never send a reset in response to a reset. */ | |
e356d37a | 512 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
7c657876 ACM |
513 | return; |
514 | ||
515 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
516 | return; | |
517 | ||
72478873 | 518 | dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb); |
7c657876 ACM |
519 | if (dst == NULL) |
520 | return; | |
521 | ||
e356d37a | 522 | skb = dccp_ctl_make_reset(dccp_v4_ctl_socket, rxskb); |
7c657876 ACM |
523 | if (skb == NULL) |
524 | goto out; | |
525 | ||
eddc9ec5 | 526 | rxiph = ip_hdr(rxskb); |
e356d37a GR |
527 | dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr, |
528 | rxiph->daddr); | |
529 | skb->dst = dst_clone(dst); | |
7c657876 | 530 | |
72478873 ACM |
531 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
532 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
eddc9ec5 | 533 | rxiph->daddr, rxiph->saddr, NULL); |
72478873 | 534 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 | 535 | |
b9df3cb8 | 536 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
537 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
538 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
539 | } | |
540 | out: | |
541 | dst_release(dst); | |
542 | } | |
543 | ||
3d2fe62b GR |
544 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
545 | { | |
546 | kfree(inet_rsk(req)->opt); | |
547 | } | |
548 | ||
549 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { | |
550 | .family = PF_INET, | |
551 | .obj_size = sizeof(struct dccp_request_sock), | |
552 | .rtx_syn_ack = dccp_v4_send_response, | |
553 | .send_ack = dccp_reqsk_send_ack, | |
554 | .destructor = dccp_v4_reqsk_destructor, | |
555 | .send_reset = dccp_v4_ctl_send_reset, | |
556 | }; | |
557 | ||
558 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
559 | { | |
560 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
561 | struct request_sock *req; |
562 | struct dccp_request_sock *dreq; | |
8109b02b | 563 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3d2fe62b | 564 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3d2fe62b GR |
565 | |
566 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
567 | if (((struct rtable *)skb->dst)->rt_flags & | |
4a5409a5 GR |
568 | (RTCF_BROADCAST | RTCF_MULTICAST)) |
569 | return 0; /* discard, don't send a reset here */ | |
3d2fe62b GR |
570 | |
571 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 572 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3d2fe62b | 573 | goto drop; |
8109b02b | 574 | } |
3d2fe62b GR |
575 | /* |
576 | * TW buckets are converted to open requests without | |
577 | * limitations, they conserve resources and peer is | |
578 | * evidently real one. | |
579 | */ | |
4a5409a5 | 580 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3d2fe62b GR |
581 | if (inet_csk_reqsk_queue_is_full(sk)) |
582 | goto drop; | |
583 | ||
584 | /* | |
585 | * Accept backlog is full. If we have already queued enough | |
586 | * of warm entries in syn queue, drop request. It is better than | |
587 | * clogging syn queue with openreqs with exponentially increasing | |
588 | * timeout. | |
589 | */ | |
590 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
591 | goto drop; | |
592 | ||
593 | req = reqsk_alloc(&dccp_request_sock_ops); | |
594 | if (req == NULL) | |
595 | goto drop; | |
596 | ||
cf557926 | 597 | dccp_reqsk_init(req, skb); |
3d2fe62b | 598 | |
8b819412 GR |
599 | dreq = dccp_rsk(req); |
600 | if (dccp_parse_options(sk, dreq, skb)) | |
601 | goto drop_and_free; | |
602 | ||
3d2fe62b GR |
603 | if (security_inet_conn_request(sk, skb, req)) |
604 | goto drop_and_free; | |
605 | ||
606 | ireq = inet_rsk(req); | |
eddc9ec5 ACM |
607 | ireq->loc_addr = ip_hdr(skb)->daddr; |
608 | ireq->rmt_addr = ip_hdr(skb)->saddr; | |
3d2fe62b GR |
609 | ireq->opt = NULL; |
610 | ||
8109b02b | 611 | /* |
3d2fe62b GR |
612 | * Step 3: Process LISTEN state |
613 | * | |
614 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
615 | * | |
616 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
617 | * dccp_create_openreq_child. | |
618 | */ | |
3d2fe62b | 619 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 620 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
3d2fe62b GR |
621 | dreq->dreq_service = service; |
622 | ||
623 | if (dccp_v4_send_response(sk, req, NULL)) | |
624 | goto drop_and_free; | |
625 | ||
626 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
627 | return 0; | |
628 | ||
629 | drop_and_free: | |
630 | reqsk_free(req); | |
631 | drop: | |
632 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3d2fe62b GR |
633 | return -1; |
634 | } | |
635 | ||
636 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
637 | ||
7c657876 ACM |
638 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
639 | { | |
640 | struct dccp_hdr *dh = dccp_hdr(skb); | |
641 | ||
642 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
643 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
644 | goto reset; | |
645 | return 0; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Step 3: Process LISTEN state | |
d83ca5ac GR |
650 | * If P.type == Request or P contains a valid Init Cookie option, |
651 | * (* Must scan the packet's options to check for Init | |
652 | * Cookies. Only Init Cookies are processed here, | |
653 | * however; other options are processed in Step 8. This | |
654 | * scan need only be performed if the endpoint uses Init | |
655 | * Cookies *) | |
656 | * (* Generate a new socket and switch to that socket *) | |
657 | * Set S := new socket for this port pair | |
658 | * S.state = RESPOND | |
659 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
660 | * Initialize S.GAR := S.ISS | |
661 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
662 | * Continue with S.state == RESPOND | |
663 | * (* A Response packet will be generated in Step 11 *) | |
664 | * Otherwise, | |
665 | * Generate Reset(No Connection) unless P.type == Reset | |
666 | * Drop packet and return | |
7c657876 | 667 | * |
7690af3f ACM |
668 | * NOTE: the check for the packet types is done in |
669 | * dccp_rcv_state_process | |
7c657876 ACM |
670 | */ |
671 | if (sk->sk_state == DCCP_LISTEN) { | |
672 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
673 | ||
674 | if (nsk == NULL) | |
675 | goto discard; | |
676 | ||
677 | if (nsk != sk) { | |
678 | if (dccp_child_process(sk, nsk, skb)) | |
679 | goto reset; | |
680 | return 0; | |
681 | } | |
682 | } | |
683 | ||
684 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
685 | goto reset; | |
686 | return 0; | |
687 | ||
688 | reset: | |
cfb6eeb4 | 689 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
690 | discard: |
691 | kfree_skb(skb); | |
692 | return 0; | |
693 | } | |
694 | ||
f21e68ca ACM |
695 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
696 | ||
09dbc389 GR |
697 | /** |
698 | * dccp_invalid_packet - check for malformed packets | |
699 | * Implements RFC 4340, 8.5: Step 1: Check header basics | |
700 | * Packets that fail these checks are ignored and do not receive Resets. | |
701 | */ | |
f21e68ca | 702 | int dccp_invalid_packet(struct sk_buff *skb) |
7c657876 ACM |
703 | { |
704 | const struct dccp_hdr *dh; | |
6f4e5fff | 705 | unsigned int cscov; |
7c657876 ACM |
706 | |
707 | if (skb->pkt_type != PACKET_HOST) | |
708 | return 1; | |
709 | ||
09dbc389 | 710 | /* If the packet is shorter than 12 bytes, drop packet and return */ |
7c657876 | 711 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { |
59348b19 | 712 | DCCP_WARN("pskb_may_pull failed\n"); |
7c657876 ACM |
713 | return 1; |
714 | } | |
715 | ||
716 | dh = dccp_hdr(skb); | |
717 | ||
09dbc389 | 718 | /* If P.type is not understood, drop packet and return */ |
7c657876 | 719 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
59348b19 | 720 | DCCP_WARN("invalid packet type\n"); |
7c657876 ACM |
721 | return 1; |
722 | } | |
723 | ||
724 | /* | |
09dbc389 | 725 | * If P.Data Offset is too small for packet type, drop packet and return |
7c657876 ACM |
726 | */ |
727 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
59348b19 | 728 | DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff); |
7c657876 ACM |
729 | return 1; |
730 | } | |
09dbc389 GR |
731 | /* |
732 | * If P.Data Offset is too too large for packet, drop packet and return | |
733 | */ | |
7c657876 | 734 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
59348b19 | 735 | DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff); |
7c657876 ACM |
736 | return 1; |
737 | } | |
738 | ||
7c657876 ACM |
739 | /* |
740 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
741 | * has short sequence numbers), drop packet and return | |
742 | */ | |
09dbc389 GR |
743 | if (dh->dccph_type >= DCCP_PKT_DATA && |
744 | dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0) { | |
59348b19 GR |
745 | DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n", |
746 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
747 | return 1; |
748 | } | |
749 | ||
6f4e5fff GR |
750 | /* |
751 | * If P.CsCov is too large for the packet size, drop packet and return. | |
752 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
753 | */ | |
754 | cscov = dccp_csum_coverage(skb); | |
755 | if (cscov > skb->len) { | |
59348b19 GR |
756 | DCCP_WARN("P.CsCov %u exceeds packet length %d\n", |
757 | dh->dccph_cscov, skb->len); | |
6f4e5fff GR |
758 | return 1; |
759 | } | |
760 | ||
761 | /* If header checksum is incorrect, drop packet and return. | |
762 | * (This step is completed in the AF-dependent functions.) */ | |
763 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
764 | ||
7c657876 ACM |
765 | return 0; |
766 | } | |
767 | ||
f21e68ca ACM |
768 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
769 | ||
7c657876 | 770 | /* this is called when real data arrives */ |
b61fafc4 | 771 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
772 | { |
773 | const struct dccp_hdr *dh; | |
eddc9ec5 | 774 | const struct iphdr *iph; |
7c657876 | 775 | struct sock *sk; |
6f4e5fff | 776 | int min_cov; |
7c657876 | 777 | |
6f4e5fff | 778 | /* Step 1: Check header basics */ |
7c657876 ACM |
779 | |
780 | if (dccp_invalid_packet(skb)) | |
781 | goto discard_it; | |
782 | ||
eddc9ec5 | 783 | iph = ip_hdr(skb); |
6f4e5fff | 784 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
eddc9ec5 | 785 | if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) { |
59348b19 | 786 | DCCP_WARN("dropped packet with invalid checksum\n"); |
f21e68ca ACM |
787 | goto discard_it; |
788 | } | |
789 | ||
7c657876 | 790 | dh = dccp_hdr(skb); |
7c657876 | 791 | |
fde20105 | 792 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
7c657876 ACM |
793 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
794 | ||
795 | dccp_pr_debug("%8.8s " | |
796 | "src=%u.%u.%u.%u@%-5d " | |
797 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
798 | dccp_packet_name(dh->dccph_type), | |
eddc9ec5 ACM |
799 | NIPQUAD(iph->saddr), ntohs(dh->dccph_sport), |
800 | NIPQUAD(iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 801 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
802 | |
803 | if (dccp_packet_without_ack(skb)) { | |
804 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
805 | dccp_pr_debug_cat("\n"); | |
806 | } else { | |
807 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 808 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 809 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
810 | } |
811 | ||
812 | /* Step 2: | |
8109b02b | 813 | * Look up flow ID in table and get corresponding socket */ |
c67499c0 | 814 | sk = __inet_lookup(&init_net, &dccp_hashinfo, |
eddc9ec5 ACM |
815 | iph->saddr, dh->dccph_sport, |
816 | iph->daddr, dh->dccph_dport, inet_iif(skb)); | |
8109b02b | 817 | /* |
7c657876 | 818 | * Step 2: |
8109b02b | 819 | * If no socket ... |
7c657876 ACM |
820 | */ |
821 | if (sk == NULL) { | |
822 | dccp_pr_debug("failed to look up flow ID in table and " | |
823 | "get corresponding socket\n"); | |
824 | goto no_dccp_socket; | |
825 | } | |
826 | ||
8109b02b | 827 | /* |
7c657876 | 828 | * Step 2: |
8109b02b | 829 | * ... or S.state == TIMEWAIT, |
7c657876 ACM |
830 | * Generate Reset(No Connection) unless P.type == Reset |
831 | * Drop packet and return | |
832 | */ | |
7c657876 | 833 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
834 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
835 | inet_twsk_put(inet_twsk(sk)); | |
836 | goto no_dccp_socket; | |
7c657876 ACM |
837 | } |
838 | ||
6f4e5fff GR |
839 | /* |
840 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
841 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
842 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
843 | */ |
844 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
845 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
846 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
847 | dh->dccph_cscov, min_cov); | |
848 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
849 | * options (Section 11.7) with Drop Code 0, Protocol | |
850 | * Constraints." */ | |
851 | goto discard_and_relse; | |
852 | } | |
853 | ||
25995ff5 | 854 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 855 | goto discard_and_relse; |
eb9c7ebe | 856 | nf_reset(skb); |
7c657876 | 857 | |
58a5a7b9 | 858 | return sk_receive_skb(sk, skb, 1); |
7c657876 ACM |
859 | |
860 | no_dccp_socket: | |
861 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
862 | goto discard_it; | |
863 | /* | |
864 | * Step 2: | |
8109b02b | 865 | * If no socket ... |
7c657876 ACM |
866 | * Generate Reset(No Connection) unless P.type == Reset |
867 | * Drop packet and return | |
868 | */ | |
869 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
870 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
871 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 872 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
873 | } |
874 | ||
875 | discard_it: | |
7c657876 ACM |
876 | kfree_skb(skb); |
877 | return 0; | |
878 | ||
879 | discard_and_relse: | |
880 | sock_put(sk); | |
881 | goto discard_it; | |
882 | } | |
883 | ||
b61fafc4 | 884 | static struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
885 | .queue_xmit = ip_queue_xmit, |
886 | .send_check = dccp_v4_send_check, | |
887 | .rebuild_header = inet_sk_rebuild_header, | |
888 | .conn_request = dccp_v4_conn_request, | |
889 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
890 | .net_header_len = sizeof(struct iphdr), | |
891 | .setsockopt = ip_setsockopt, | |
892 | .getsockopt = ip_getsockopt, | |
893 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
894 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 895 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 896 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
897 | .compat_setsockopt = compat_ip_setsockopt, |
898 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 899 | #endif |
57cca05a ACM |
900 | }; |
901 | ||
3e0fadc5 | 902 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 903 | { |
72478873 ACM |
904 | static __u8 dccp_v4_ctl_sock_initialized; |
905 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 906 | |
72478873 ACM |
907 | if (err == 0) { |
908 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
909 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 910 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
911 | } |
912 | ||
3e0fadc5 | 913 | return err; |
7c657876 ACM |
914 | } |
915 | ||
6d6ee43e ACM |
916 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
917 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
918 | }; | |
919 | ||
c62cf5cb DM |
920 | DEFINE_PROTO_INUSE(dccp_v4) |
921 | ||
5e0817f8 | 922 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
923 | .name = "DCCP", |
924 | .owner = THIS_MODULE, | |
925 | .close = dccp_close, | |
926 | .connect = dccp_v4_connect, | |
927 | .disconnect = dccp_disconnect, | |
928 | .ioctl = dccp_ioctl, | |
929 | .init = dccp_v4_init_sock, | |
930 | .setsockopt = dccp_setsockopt, | |
931 | .getsockopt = dccp_getsockopt, | |
932 | .sendmsg = dccp_sendmsg, | |
933 | .recvmsg = dccp_recvmsg, | |
934 | .backlog_rcv = dccp_v4_do_rcv, | |
ab1e0a13 ACM |
935 | .hash = inet_hash, |
936 | .unhash = inet_unhash, | |
7c657876 | 937 | .accept = inet_csk_accept, |
ab1e0a13 | 938 | .get_port = inet_csk_get_port, |
7c657876 | 939 | .shutdown = dccp_shutdown, |
3e0fadc5 | 940 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
941 | .orphan_count = &dccp_orphan_count, |
942 | .max_header = MAX_DCCP_HEADER, | |
943 | .obj_size = sizeof(struct dccp_sock), | |
944 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 945 | .twsk_prot = &dccp_timewait_sock_ops, |
ab1e0a13 | 946 | .hashinfo = &dccp_hashinfo, |
543d9cfe ACM |
947 | #ifdef CONFIG_COMPAT |
948 | .compat_setsockopt = compat_dccp_setsockopt, | |
949 | .compat_getsockopt = compat_dccp_getsockopt, | |
950 | #endif | |
c62cf5cb | 951 | REF_PROTO_INUSE(dccp_v4) |
7c657876 | 952 | }; |
6d6ee43e | 953 | |
b61fafc4 ACM |
954 | static struct net_protocol dccp_v4_protocol = { |
955 | .handler = dccp_v4_rcv, | |
956 | .err_handler = dccp_v4_err, | |
957 | .no_policy = 1, | |
958 | }; | |
959 | ||
960 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
961 | .family = PF_INET, |
962 | .owner = THIS_MODULE, | |
963 | .release = inet_release, | |
964 | .bind = inet_bind, | |
965 | .connect = inet_stream_connect, | |
966 | .socketpair = sock_no_socketpair, | |
967 | .accept = inet_accept, | |
968 | .getname = inet_getname, | |
b61fafc4 | 969 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
970 | .poll = dccp_poll, |
971 | .ioctl = inet_ioctl, | |
b61fafc4 | 972 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
973 | .listen = inet_dccp_listen, |
974 | .shutdown = inet_shutdown, | |
975 | .setsockopt = sock_common_setsockopt, | |
976 | .getsockopt = sock_common_getsockopt, | |
977 | .sendmsg = inet_sendmsg, | |
978 | .recvmsg = sock_common_recvmsg, | |
979 | .mmap = sock_no_mmap, | |
980 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 981 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
982 | .compat_setsockopt = compat_sock_common_setsockopt, |
983 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 984 | #endif |
b61fafc4 ACM |
985 | }; |
986 | ||
987 | static struct inet_protosw dccp_v4_protosw = { | |
988 | .type = SOCK_DCCP, | |
989 | .protocol = IPPROTO_DCCP, | |
990 | .prot = &dccp_v4_prot, | |
991 | .ops = &inet_dccp_ops, | |
992 | .capability = -1, | |
993 | .no_check = 0, | |
994 | .flags = INET_PROTOSW_ICSK, | |
995 | }; | |
996 | ||
b61fafc4 ACM |
997 | static int __init dccp_v4_init(void) |
998 | { | |
999 | int err = proto_register(&dccp_v4_prot, 1); | |
1000 | ||
1001 | if (err != 0) | |
1002 | goto out; | |
1003 | ||
1004 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1005 | if (err != 0) | |
1006 | goto out_proto_unregister; | |
1007 | ||
1008 | inet_register_protosw(&dccp_v4_protosw); | |
1009 | ||
c4d93909 ACM |
1010 | err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET, |
1011 | SOCK_DCCP, IPPROTO_DCCP); | |
b61fafc4 ACM |
1012 | if (err) |
1013 | goto out_unregister_protosw; | |
1014 | out: | |
1015 | return err; | |
1016 | out_unregister_protosw: | |
1017 | inet_unregister_protosw(&dccp_v4_protosw); | |
1018 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1019 | out_proto_unregister: | |
1020 | proto_unregister(&dccp_v4_prot); | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | static void __exit dccp_v4_exit(void) | |
1025 | { | |
1026 | inet_unregister_protosw(&dccp_v4_protosw); | |
1027 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1028 | proto_unregister(&dccp_v4_prot); | |
1029 | } | |
1030 | ||
1031 | module_init(dccp_v4_init); | |
1032 | module_exit(dccp_v4_exit); | |
1033 | ||
1034 | /* | |
1035 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1036 | * values directly, Also cover the case where the protocol is not specified, | |
1037 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1038 | */ | |
7131c6c7 JD |
1039 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 33, 6); |
1040 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 0, 6); | |
b61fafc4 ACM |
1041 | MODULE_LICENSE("GPL"); |
1042 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1043 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |