Commit | Line | Data |
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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 | ||
7c657876 ACM |
41 | static int dccp_v4_get_port(struct sock *sk, const unsigned short snum) |
42 | { | |
971af18b ACM |
43 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, |
44 | inet_csk_bind_conflict); | |
7c657876 ACM |
45 | } |
46 | ||
f21e68ca | 47 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 ACM |
48 | { |
49 | struct inet_sock *inet = inet_sk(sk); | |
50 | struct dccp_sock *dp = dccp_sk(sk); | |
51 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
52 | struct rtable *rt; | |
bada8adc | 53 | __be32 daddr, nexthop; |
7c657876 ACM |
54 | int tmp; |
55 | int err; | |
56 | ||
57 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
58 | ||
59 | if (addr_len < sizeof(struct sockaddr_in)) | |
60 | return -EINVAL; | |
61 | ||
62 | if (usin->sin_family != AF_INET) | |
63 | return -EAFNOSUPPORT; | |
64 | ||
65 | nexthop = daddr = usin->sin_addr.s_addr; | |
66 | if (inet->opt != NULL && inet->opt->srr) { | |
67 | if (daddr == 0) | |
68 | return -EINVAL; | |
69 | nexthop = inet->opt->faddr; | |
70 | } | |
71 | ||
72 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
73 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
74 | IPPROTO_DCCP, | |
75 | inet->sport, usin->sin_port, sk); | |
76 | if (tmp < 0) | |
77 | return tmp; | |
78 | ||
79 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
80 | ip_rt_put(rt); | |
81 | return -ENETUNREACH; | |
82 | } | |
83 | ||
84 | if (inet->opt == NULL || !inet->opt->srr) | |
85 | daddr = rt->rt_dst; | |
86 | ||
87 | if (inet->saddr == 0) | |
88 | inet->saddr = rt->rt_src; | |
89 | inet->rcv_saddr = inet->saddr; | |
90 | ||
91 | inet->dport = usin->sin_port; | |
92 | inet->daddr = daddr; | |
93 | ||
d83d8461 | 94 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 95 | if (inet->opt != NULL) |
d83d8461 | 96 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
97 | /* |
98 | * Socket identity is still unknown (sport may be zero). | |
99 | * However we set state to DCCP_REQUESTING and not releasing socket | |
100 | * lock select source port, enter ourselves into the hash tables and | |
101 | * complete initialization after this. | |
102 | */ | |
103 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 104 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
105 | if (err != 0) |
106 | goto failure; | |
107 | ||
5d39a795 PM |
108 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport, |
109 | sk); | |
7c657876 ACM |
110 | if (err != 0) |
111 | goto failure; | |
112 | ||
113 | /* OK, now commit destination to socket. */ | |
114 | sk_setup_caps(sk, &rt->u.dst); | |
115 | ||
d7f7365f GR |
116 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, inet->daddr, |
117 | inet->sport, inet->dport); | |
7c657876 ACM |
118 | inet->id = dp->dccps_iss ^ jiffies; |
119 | ||
120 | err = dccp_connect(sk); | |
121 | rt = NULL; | |
122 | if (err != 0) | |
123 | goto failure; | |
124 | out: | |
125 | return err; | |
126 | failure: | |
7690af3f ACM |
127 | /* |
128 | * This unhashes the socket and releases the local port, if necessary. | |
129 | */ | |
7c657876 ACM |
130 | dccp_set_state(sk, DCCP_CLOSED); |
131 | ip_rt_put(rt); | |
132 | sk->sk_route_caps = 0; | |
133 | inet->dport = 0; | |
134 | goto out; | |
135 | } | |
136 | ||
f21e68ca ACM |
137 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
138 | ||
7c657876 ACM |
139 | /* |
140 | * This routine does path mtu discovery as defined in RFC1191. | |
141 | */ | |
142 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
143 | const struct iphdr *iph, | |
144 | u32 mtu) | |
145 | { | |
146 | struct dst_entry *dst; | |
147 | const struct inet_sock *inet = inet_sk(sk); | |
148 | const struct dccp_sock *dp = dccp_sk(sk); | |
149 | ||
150 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
151 | * send out by Linux are always < 576bytes so they should go through | |
152 | * unfragmented). | |
153 | */ | |
154 | if (sk->sk_state == DCCP_LISTEN) | |
155 | return; | |
156 | ||
157 | /* We don't check in the destentry if pmtu discovery is forbidden | |
158 | * on this route. We just assume that no packet_to_big packets | |
159 | * are send back when pmtu discovery is not active. | |
160 | * There is a small race when the user changes this flag in the | |
161 | * route, but I think that's acceptable. | |
162 | */ | |
163 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
164 | return; | |
165 | ||
166 | dst->ops->update_pmtu(dst, mtu); | |
167 | ||
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 | ||
7c657876 ACM |
191 | /* |
192 | * This routine is called by the ICMP module when it gets some sort of error | |
193 | * condition. If err < 0 then the socket should be closed and the error | |
194 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
195 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
196 | * need to find the appropriate port. | |
197 | * | |
198 | * The locking strategy used here is very "optimistic". When someone else | |
199 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
200 | * check at all. A more general error queue to queue errors for later handling | |
201 | * is probably better. | |
202 | */ | |
b61fafc4 | 203 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
204 | { |
205 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
206 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
207 | (iph->ihl << 2)); | |
7c657876 ACM |
208 | struct dccp_sock *dp; |
209 | struct inet_sock *inet; | |
210 | const int type = skb->h.icmph->type; | |
211 | const int code = skb->h.icmph->code; | |
212 | struct sock *sk; | |
213 | __u64 seq; | |
214 | int err; | |
215 | ||
216 | if (skb->len < (iph->ihl << 2) + 8) { | |
217 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
218 | return; | |
219 | } | |
220 | ||
221 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
222 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
223 | if (sk == NULL) { | |
224 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
225 | return; | |
226 | } | |
227 | ||
228 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 229 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
230 | return; |
231 | } | |
232 | ||
233 | bh_lock_sock(sk); | |
234 | /* If too many ICMPs get dropped on busy | |
235 | * servers this needs to be solved differently. | |
236 | */ | |
237 | if (sock_owned_by_user(sk)) | |
238 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
239 | ||
240 | if (sk->sk_state == DCCP_CLOSED) | |
241 | goto out; | |
242 | ||
243 | dp = dccp_sk(sk); | |
244 | seq = dccp_hdr_seq(skb); | |
245 | if (sk->sk_state != DCCP_LISTEN && | |
246 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
247 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
248 | goto out; | |
249 | } | |
250 | ||
251 | switch (type) { | |
252 | case ICMP_SOURCE_QUENCH: | |
253 | /* Just silently ignore these. */ | |
254 | goto out; | |
255 | case ICMP_PARAMETERPROB: | |
256 | err = EPROTO; | |
257 | break; | |
258 | case ICMP_DEST_UNREACH: | |
259 | if (code > NR_ICMP_UNREACH) | |
260 | goto out; | |
261 | ||
262 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
263 | if (!sock_owned_by_user(sk)) | |
264 | dccp_do_pmtu_discovery(sk, iph, info); | |
265 | goto out; | |
266 | } | |
267 | ||
268 | err = icmp_err_convert[code].errno; | |
269 | break; | |
270 | case ICMP_TIME_EXCEEDED: | |
271 | err = EHOSTUNREACH; | |
272 | break; | |
273 | default: | |
274 | goto out; | |
275 | } | |
276 | ||
277 | switch (sk->sk_state) { | |
278 | struct request_sock *req , **prev; | |
279 | case DCCP_LISTEN: | |
280 | if (sock_owned_by_user(sk)) | |
281 | goto out; | |
282 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
283 | iph->daddr, iph->saddr); | |
284 | if (!req) | |
285 | goto out; | |
286 | ||
287 | /* | |
288 | * ICMPs are not backlogged, hence we cannot get an established | |
289 | * socket here. | |
290 | */ | |
291 | BUG_TRAP(!req->sk); | |
292 | ||
293 | if (seq != dccp_rsk(req)->dreq_iss) { | |
294 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
295 | goto out; | |
296 | } | |
297 | /* | |
298 | * Still in RESPOND, just remove it silently. | |
299 | * There is no good way to pass the error to the newly | |
300 | * created socket, and POSIX does not want network | |
301 | * errors returned from accept(). | |
302 | */ | |
303 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
304 | goto out; | |
305 | ||
306 | case DCCP_REQUESTING: | |
307 | case DCCP_RESPOND: | |
308 | if (!sock_owned_by_user(sk)) { | |
309 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
310 | sk->sk_err = err; | |
311 | ||
312 | sk->sk_error_report(sk); | |
313 | ||
314 | dccp_done(sk); | |
315 | } else | |
316 | sk->sk_err_soft = err; | |
317 | goto out; | |
318 | } | |
319 | ||
320 | /* If we've already connected we will keep trying | |
321 | * until we time out, or the user gives up. | |
322 | * | |
323 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
324 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
325 | * but it is obsoleted by pmtu discovery). | |
326 | * | |
327 | * Note, that in modern internet, where routing is unreliable | |
328 | * and in each dark corner broken firewalls sit, sending random | |
329 | * errors ordered by their masters even this two messages finally lose | |
330 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
331 | * | |
332 | * Now we are in compliance with RFCs. | |
333 | * --ANK (980905) | |
334 | */ | |
335 | ||
336 | inet = inet_sk(sk); | |
337 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
338 | sk->sk_err = err; | |
339 | sk->sk_error_report(sk); | |
340 | } else /* Only an error on timeout */ | |
341 | sk->sk_err_soft = err; | |
342 | out: | |
343 | bh_unlock_sock(sk); | |
344 | sock_put(sk); | |
345 | } | |
346 | ||
6f4e5fff GR |
347 | static inline u16 dccp_v4_csum_finish(struct sk_buff *skb, |
348 | __be32 src, __be32 dst) | |
349 | { | |
350 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
351 | } | |
352 | ||
353 | void dccp_v4_send_check(struct sock *sk, int unused, struct sk_buff *skb) | |
57cca05a ACM |
354 | { |
355 | const struct inet_sock *inet = inet_sk(sk); | |
356 | struct dccp_hdr *dh = dccp_hdr(skb); | |
357 | ||
6f4e5fff GR |
358 | dccp_csum_outgoing(skb); |
359 | dh->dccph_checksum = dccp_v4_csum_finish(skb, inet->saddr, inet->daddr); | |
57cca05a ACM |
360 | } |
361 | ||
f21e68ca ACM |
362 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
363 | ||
865e9022 | 364 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 ACM |
365 | { |
366 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
367 | skb->nh.iph->saddr, | |
368 | dccp_hdr(skb)->dccph_dport, | |
369 | dccp_hdr(skb)->dccph_sport); | |
370 | } | |
371 | ||
7c657876 ACM |
372 | /* |
373 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
374 | * now create the new socket. | |
375 | * | |
376 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
377 | */ | |
378 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
379 | struct request_sock *req, | |
380 | struct dst_entry *dst) | |
381 | { | |
382 | struct inet_request_sock *ireq; | |
383 | struct inet_sock *newinet; | |
384 | struct dccp_sock *newdp; | |
385 | struct sock *newsk; | |
386 | ||
387 | if (sk_acceptq_is_full(sk)) | |
388 | goto exit_overflow; | |
389 | ||
390 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
391 | goto exit; | |
392 | ||
393 | newsk = dccp_create_openreq_child(sk, req, skb); | |
394 | if (newsk == NULL) | |
395 | goto exit; | |
396 | ||
397 | sk_setup_caps(newsk, dst); | |
398 | ||
399 | newdp = dccp_sk(newsk); | |
400 | newinet = inet_sk(newsk); | |
401 | ireq = inet_rsk(req); | |
402 | newinet->daddr = ireq->rmt_addr; | |
403 | newinet->rcv_saddr = ireq->loc_addr; | |
404 | newinet->saddr = ireq->loc_addr; | |
405 | newinet->opt = ireq->opt; | |
406 | ireq->opt = NULL; | |
407 | newinet->mc_index = inet_iif(skb); | |
408 | newinet->mc_ttl = skb->nh.iph->ttl; | |
409 | newinet->id = jiffies; | |
410 | ||
411 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
412 | ||
413 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
414 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
415 | ||
416 | return newsk; | |
417 | ||
418 | exit_overflow: | |
419 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
420 | exit: | |
421 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
422 | dst_release(dst); | |
423 | return NULL; | |
424 | } | |
425 | ||
f21e68ca ACM |
426 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
427 | ||
7c657876 ACM |
428 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
429 | { | |
430 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
431 | const struct iphdr *iph = skb->nh.iph; | |
432 | struct sock *nsk; | |
433 | struct request_sock **prev; | |
434 | /* Find possible connection requests. */ | |
435 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
436 | dh->dccph_sport, | |
437 | iph->saddr, iph->daddr); | |
438 | if (req != NULL) | |
439 | return dccp_check_req(sk, skb, req, prev); | |
440 | ||
8f491069 HX |
441 | nsk = inet_lookup_established(&dccp_hashinfo, |
442 | iph->saddr, dh->dccph_sport, | |
443 | iph->daddr, dh->dccph_dport, | |
444 | inet_iif(skb)); | |
7c657876 ACM |
445 | if (nsk != NULL) { |
446 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
447 | bh_lock_sock(nsk); | |
448 | return nsk; | |
449 | } | |
9469c7b4 | 450 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
451 | return NULL; |
452 | } | |
453 | ||
454 | return sk; | |
455 | } | |
456 | ||
7c657876 ACM |
457 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, |
458 | struct sk_buff *skb) | |
459 | { | |
460 | struct rtable *rt; | |
461 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
462 | .nl_u = { .ip4_u = | |
463 | { .daddr = skb->nh.iph->saddr, | |
464 | .saddr = skb->nh.iph->daddr, | |
465 | .tos = RT_CONN_FLAGS(sk) } }, | |
466 | .proto = sk->sk_protocol, | |
467 | .uli_u = { .ports = | |
468 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
469 | .dport = dccp_hdr(skb)->dccph_sport } |
470 | } | |
471 | }; | |
7c657876 | 472 | |
beb8d13b | 473 | security_skb_classify_flow(skb, &fl); |
7c657876 ACM |
474 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { |
475 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | return &rt->u.dst; | |
480 | } | |
481 | ||
3d2fe62b GR |
482 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
483 | struct dst_entry *dst) | |
484 | { | |
485 | int err = -1; | |
486 | struct sk_buff *skb; | |
487 | ||
488 | /* First, grab a route. */ | |
489 | ||
490 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
491 | goto out; | |
492 | ||
493 | skb = dccp_make_response(sk, dst, req); | |
494 | if (skb != NULL) { | |
495 | const struct inet_request_sock *ireq = inet_rsk(req); | |
496 | struct dccp_hdr *dh = dccp_hdr(skb); | |
497 | ||
6f4e5fff GR |
498 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->loc_addr, |
499 | ireq->rmt_addr); | |
3d2fe62b GR |
500 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
501 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, | |
502 | ireq->rmt_addr, | |
503 | ireq->opt); | |
b9df3cb8 | 504 | err = net_xmit_eval(err); |
3d2fe62b GR |
505 | } |
506 | ||
507 | out: | |
508 | dst_release(dst); | |
509 | return err; | |
510 | } | |
511 | ||
a1d3a355 | 512 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
513 | { |
514 | int err; | |
515 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
516 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
517 | sizeof(struct dccp_hdr_ext) + | |
518 | sizeof(struct dccp_hdr_reset); | |
519 | struct sk_buff *skb; | |
520 | struct dst_entry *dst; | |
09dbc389 | 521 | u64 seqno = 0; |
7c657876 ACM |
522 | |
523 | /* Never send a reset in response to a reset. */ | |
524 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
525 | return; | |
526 | ||
527 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
528 | return; | |
529 | ||
72478873 | 530 | dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb); |
7c657876 ACM |
531 | if (dst == NULL) |
532 | return; | |
533 | ||
118b2c95 ACM |
534 | skb = alloc_skb(dccp_v4_ctl_socket->sk->sk_prot->max_header, |
535 | GFP_ATOMIC); | |
7c657876 ACM |
536 | if (skb == NULL) |
537 | goto out; | |
538 | ||
539 | /* Reserve space for headers. */ | |
118b2c95 | 540 | skb_reserve(skb, dccp_v4_ctl_socket->sk->sk_prot->max_header); |
7c657876 ACM |
541 | skb->dst = dst_clone(dst); |
542 | ||
9b42078e | 543 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
7c657876 ACM |
544 | |
545 | /* Build DCCP header and checksum it. */ | |
546 | dh->dccph_type = DCCP_PKT_RESET; | |
547 | dh->dccph_sport = rxdh->dccph_dport; | |
548 | dh->dccph_dport = rxdh->dccph_sport; | |
549 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
550 | dh->dccph_x = 1; | |
7690af3f ACM |
551 | dccp_hdr_reset(skb)->dccph_reset_code = |
552 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 553 | |
0e64e94e | 554 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
2807d4ff ACM |
555 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) |
556 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
557 | ||
558 | dccp_hdr_set_seq(dh, seqno); | |
09dbc389 | 559 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq); |
7c657876 | 560 | |
6f4e5fff GR |
561 | dccp_csum_outgoing(skb); |
562 | dh->dccph_checksum = dccp_v4_csum_finish(skb, rxskb->nh.iph->saddr, | |
563 | rxskb->nh.iph->daddr); | |
7c657876 | 564 | |
72478873 ACM |
565 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
566 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
7690af3f ACM |
567 | rxskb->nh.iph->daddr, |
568 | rxskb->nh.iph->saddr, NULL); | |
72478873 | 569 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 | 570 | |
b9df3cb8 | 571 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
572 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
573 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
574 | } | |
575 | out: | |
576 | dst_release(dst); | |
577 | } | |
578 | ||
3d2fe62b GR |
579 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
580 | { | |
581 | kfree(inet_rsk(req)->opt); | |
582 | } | |
583 | ||
584 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { | |
585 | .family = PF_INET, | |
586 | .obj_size = sizeof(struct dccp_request_sock), | |
587 | .rtx_syn_ack = dccp_v4_send_response, | |
588 | .send_ack = dccp_reqsk_send_ack, | |
589 | .destructor = dccp_v4_reqsk_destructor, | |
590 | .send_reset = dccp_v4_ctl_send_reset, | |
591 | }; | |
592 | ||
593 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
594 | { | |
595 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
596 | struct request_sock *req; |
597 | struct dccp_request_sock *dreq; | |
3d2fe62b GR |
598 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
599 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); | |
600 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
601 | ||
602 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
603 | if (((struct rtable *)skb->dst)->rt_flags & | |
604 | (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
605 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
606 | goto drop; | |
607 | } | |
608 | ||
609 | if (dccp_bad_service_code(sk, service)) { | |
610 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
611 | goto drop; | |
612 | } | |
613 | /* | |
614 | * TW buckets are converted to open requests without | |
615 | * limitations, they conserve resources and peer is | |
616 | * evidently real one. | |
617 | */ | |
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 | ||
630 | req = reqsk_alloc(&dccp_request_sock_ops); | |
631 | if (req == NULL) | |
632 | goto drop; | |
633 | ||
634 | if (dccp_parse_options(sk, skb)) | |
635 | goto drop_and_free; | |
636 | ||
cf557926 | 637 | dccp_reqsk_init(req, skb); |
3d2fe62b GR |
638 | |
639 | if (security_inet_conn_request(sk, skb, req)) | |
640 | goto drop_and_free; | |
641 | ||
642 | ireq = inet_rsk(req); | |
cf557926 GR |
643 | ireq->loc_addr = skb->nh.iph->daddr; |
644 | ireq->rmt_addr = skb->nh.iph->saddr; | |
3d2fe62b GR |
645 | ireq->opt = NULL; |
646 | ||
647 | /* | |
648 | * Step 3: Process LISTEN state | |
649 | * | |
650 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
651 | * | |
652 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
653 | * dccp_create_openreq_child. | |
654 | */ | |
655 | dreq = dccp_rsk(req); | |
656 | dreq->dreq_isr = dcb->dccpd_seq; | |
865e9022 | 657 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
3d2fe62b GR |
658 | dreq->dreq_service = service; |
659 | ||
660 | if (dccp_v4_send_response(sk, req, NULL)) | |
661 | goto drop_and_free; | |
662 | ||
663 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
664 | return 0; | |
665 | ||
666 | drop_and_free: | |
667 | reqsk_free(req); | |
668 | drop: | |
669 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
670 | dcb->dccpd_reset_code = reset_code; | |
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: | |
7c657876 ACM |
727 | dccp_v4_ctl_send_reset(skb); |
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))) { |
c59eab46 | 750 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: 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) { |
c59eab46 | 758 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: 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)) { | |
c59eab46 | 766 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
09dbc389 | 767 | "too small\n", dh->dccph_doff); |
7c657876 ACM |
768 | return 1; |
769 | } | |
09dbc389 GR |
770 | /* |
771 | * If P.Data Offset is too too large for packet, drop packet and return | |
772 | */ | |
7c657876 | 773 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
c59eab46 | 774 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
09dbc389 | 775 | "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 | */ | |
09dbc389 GR |
783 | if (dh->dccph_type >= DCCP_PKT_DATA && |
784 | dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0) { | |
785 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data||Ack||" | |
786 | "DataAck, while P.X == 0\n", | |
c59eab46 | 787 | dccp_packet_name(dh->dccph_type)); |
7c657876 ACM |
788 | return 1; |
789 | } | |
790 | ||
6f4e5fff GR |
791 | /* |
792 | * If P.CsCov is too large for the packet size, drop packet and return. | |
793 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
794 | */ | |
795 | cscov = dccp_csum_coverage(skb); | |
796 | if (cscov > skb->len) { | |
797 | LIMIT_NETDEBUG(KERN_WARNING | |
798 | "DCCP: P.CsCov %u exceeds packet length %d\n", | |
799 | dh->dccph_cscov, skb->len); | |
800 | return 1; | |
801 | } | |
802 | ||
803 | /* If header checksum is incorrect, drop packet and return. | |
804 | * (This step is completed in the AF-dependent functions.) */ | |
805 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
806 | ||
7c657876 ACM |
807 | return 0; |
808 | } | |
809 | ||
f21e68ca ACM |
810 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
811 | ||
7c657876 | 812 | /* this is called when real data arrives */ |
b61fafc4 | 813 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
814 | { |
815 | const struct dccp_hdr *dh; | |
816 | struct sock *sk; | |
6f4e5fff | 817 | int min_cov; |
7c657876 | 818 | |
6f4e5fff | 819 | /* Step 1: Check header basics */ |
7c657876 ACM |
820 | |
821 | if (dccp_invalid_packet(skb)) | |
822 | goto discard_it; | |
823 | ||
6f4e5fff GR |
824 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
825 | if (dccp_v4_csum_finish(skb, skb->nh.iph->saddr, skb->nh.iph->daddr)) { | |
826 | LIMIT_NETDEBUG(KERN_WARNING | |
827 | "%s: dropped packet with invalid checksum\n", | |
f21e68ca ACM |
828 | __FUNCTION__); |
829 | goto discard_it; | |
830 | } | |
831 | ||
7c657876 | 832 | dh = dccp_hdr(skb); |
7c657876 | 833 | |
7c657876 ACM |
834 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
835 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
836 | ||
837 | dccp_pr_debug("%8.8s " | |
838 | "src=%u.%u.%u.%u@%-5d " | |
839 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
840 | dccp_packet_name(dh->dccph_type), | |
841 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
842 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 843 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
844 | |
845 | if (dccp_packet_without_ack(skb)) { | |
846 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
847 | dccp_pr_debug_cat("\n"); | |
848 | } else { | |
849 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 850 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 851 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
852 | } |
853 | ||
854 | /* Step 2: | |
855 | * Look up flow ID in table and get corresponding socket */ | |
856 | sk = __inet_lookup(&dccp_hashinfo, | |
857 | skb->nh.iph->saddr, dh->dccph_sport, | |
8f491069 | 858 | skb->nh.iph->daddr, dh->dccph_dport, |
7c657876 ACM |
859 | inet_iif(skb)); |
860 | ||
861 | /* | |
862 | * Step 2: | |
863 | * If no socket ... | |
7c657876 ACM |
864 | */ |
865 | if (sk == NULL) { | |
866 | dccp_pr_debug("failed to look up flow ID in table and " | |
867 | "get corresponding socket\n"); | |
868 | goto no_dccp_socket; | |
869 | } | |
870 | ||
871 | /* | |
872 | * Step 2: | |
873 | * ... or S.state == TIMEWAIT, | |
874 | * Generate Reset(No Connection) unless P.type == Reset | |
875 | * Drop packet and return | |
876 | */ | |
7c657876 | 877 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
878 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
879 | inet_twsk_put(inet_twsk(sk)); | |
880 | goto no_dccp_socket; | |
7c657876 ACM |
881 | } |
882 | ||
6f4e5fff GR |
883 | /* |
884 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
885 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted | |
886 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
887 | */ | |
888 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
889 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
890 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
891 | dh->dccph_cscov, min_cov); | |
892 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
893 | * options (Section 11.7) with Drop Code 0, Protocol | |
894 | * Constraints." */ | |
895 | goto discard_and_relse; | |
896 | } | |
897 | ||
25995ff5 | 898 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 899 | goto discard_and_relse; |
eb9c7ebe | 900 | nf_reset(skb); |
7c657876 | 901 | |
25995ff5 | 902 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
903 | |
904 | no_dccp_socket: | |
905 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
906 | goto discard_it; | |
907 | /* | |
908 | * Step 2: | |
d83ca5ac | 909 | * If no socket ... |
7c657876 ACM |
910 | * Generate Reset(No Connection) unless P.type == Reset |
911 | * Drop packet and return | |
912 | */ | |
913 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
914 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
915 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
916 | dccp_v4_ctl_send_reset(skb); |
917 | } | |
918 | ||
919 | discard_it: | |
7c657876 ACM |
920 | kfree_skb(skb); |
921 | return 0; | |
922 | ||
923 | discard_and_relse: | |
924 | sock_put(sk); | |
925 | goto discard_it; | |
926 | } | |
927 | ||
b61fafc4 | 928 | static struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
929 | .queue_xmit = ip_queue_xmit, |
930 | .send_check = dccp_v4_send_check, | |
931 | .rebuild_header = inet_sk_rebuild_header, | |
932 | .conn_request = dccp_v4_conn_request, | |
933 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
934 | .net_header_len = sizeof(struct iphdr), | |
935 | .setsockopt = ip_setsockopt, | |
936 | .getsockopt = ip_getsockopt, | |
937 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
938 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 939 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
940 | .compat_setsockopt = compat_ip_setsockopt, |
941 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 942 | #endif |
57cca05a ACM |
943 | }; |
944 | ||
3e0fadc5 | 945 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 946 | { |
72478873 ACM |
947 | static __u8 dccp_v4_ctl_sock_initialized; |
948 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 949 | |
72478873 ACM |
950 | if (err == 0) { |
951 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
952 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 953 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
954 | } |
955 | ||
3e0fadc5 | 956 | return err; |
7c657876 ACM |
957 | } |
958 | ||
6d6ee43e ACM |
959 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
960 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
961 | }; | |
962 | ||
5e0817f8 | 963 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
964 | .name = "DCCP", |
965 | .owner = THIS_MODULE, | |
966 | .close = dccp_close, | |
967 | .connect = dccp_v4_connect, | |
968 | .disconnect = dccp_disconnect, | |
969 | .ioctl = dccp_ioctl, | |
970 | .init = dccp_v4_init_sock, | |
971 | .setsockopt = dccp_setsockopt, | |
972 | .getsockopt = dccp_getsockopt, | |
973 | .sendmsg = dccp_sendmsg, | |
974 | .recvmsg = dccp_recvmsg, | |
975 | .backlog_rcv = dccp_v4_do_rcv, | |
c985ed70 | 976 | .hash = dccp_hash, |
f21e68ca | 977 | .unhash = dccp_unhash, |
7c657876 ACM |
978 | .accept = inet_csk_accept, |
979 | .get_port = dccp_v4_get_port, | |
980 | .shutdown = dccp_shutdown, | |
3e0fadc5 | 981 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
982 | .orphan_count = &dccp_orphan_count, |
983 | .max_header = MAX_DCCP_HEADER, | |
984 | .obj_size = sizeof(struct dccp_sock), | |
985 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 986 | .twsk_prot = &dccp_timewait_sock_ops, |
543d9cfe ACM |
987 | #ifdef CONFIG_COMPAT |
988 | .compat_setsockopt = compat_dccp_setsockopt, | |
989 | .compat_getsockopt = compat_dccp_getsockopt, | |
990 | #endif | |
7c657876 | 991 | }; |
6d6ee43e | 992 | |
b61fafc4 ACM |
993 | static struct net_protocol dccp_v4_protocol = { |
994 | .handler = dccp_v4_rcv, | |
995 | .err_handler = dccp_v4_err, | |
996 | .no_policy = 1, | |
997 | }; | |
998 | ||
999 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
1000 | .family = PF_INET, |
1001 | .owner = THIS_MODULE, | |
1002 | .release = inet_release, | |
1003 | .bind = inet_bind, | |
1004 | .connect = inet_stream_connect, | |
1005 | .socketpair = sock_no_socketpair, | |
1006 | .accept = inet_accept, | |
1007 | .getname = inet_getname, | |
b61fafc4 | 1008 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1009 | .poll = dccp_poll, |
1010 | .ioctl = inet_ioctl, | |
b61fafc4 | 1011 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1012 | .listen = inet_dccp_listen, |
1013 | .shutdown = inet_shutdown, | |
1014 | .setsockopt = sock_common_setsockopt, | |
1015 | .getsockopt = sock_common_getsockopt, | |
1016 | .sendmsg = inet_sendmsg, | |
1017 | .recvmsg = sock_common_recvmsg, | |
1018 | .mmap = sock_no_mmap, | |
1019 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1020 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1021 | .compat_setsockopt = compat_sock_common_setsockopt, |
1022 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1023 | #endif |
b61fafc4 ACM |
1024 | }; |
1025 | ||
1026 | static struct inet_protosw dccp_v4_protosw = { | |
1027 | .type = SOCK_DCCP, | |
1028 | .protocol = IPPROTO_DCCP, | |
1029 | .prot = &dccp_v4_prot, | |
1030 | .ops = &inet_dccp_ops, | |
1031 | .capability = -1, | |
1032 | .no_check = 0, | |
1033 | .flags = INET_PROTOSW_ICSK, | |
1034 | }; | |
1035 | ||
b61fafc4 ACM |
1036 | static int __init dccp_v4_init(void) |
1037 | { | |
1038 | int err = proto_register(&dccp_v4_prot, 1); | |
1039 | ||
1040 | if (err != 0) | |
1041 | goto out; | |
1042 | ||
1043 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1044 | if (err != 0) | |
1045 | goto out_proto_unregister; | |
1046 | ||
1047 | inet_register_protosw(&dccp_v4_protosw); | |
1048 | ||
c4d93909 ACM |
1049 | err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET, |
1050 | SOCK_DCCP, IPPROTO_DCCP); | |
b61fafc4 ACM |
1051 | if (err) |
1052 | goto out_unregister_protosw; | |
1053 | out: | |
1054 | return err; | |
1055 | out_unregister_protosw: | |
1056 | inet_unregister_protosw(&dccp_v4_protosw); | |
1057 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1058 | out_proto_unregister: | |
1059 | proto_unregister(&dccp_v4_prot); | |
1060 | goto out; | |
1061 | } | |
1062 | ||
1063 | static void __exit dccp_v4_exit(void) | |
1064 | { | |
1065 | inet_unregister_protosw(&dccp_v4_protosw); | |
1066 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1067 | proto_unregister(&dccp_v4_prot); | |
1068 | } | |
1069 | ||
1070 | module_init(dccp_v4_init); | |
1071 | module_exit(dccp_v4_exit); | |
1072 | ||
1073 | /* | |
1074 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1075 | * values directly, Also cover the case where the protocol is not specified, | |
1076 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1077 | */ | |
1078 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
1079 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
1080 | MODULE_LICENSE("GPL"); | |
1081 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1082 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |