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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/dccp.h> | |
15 | #include <linux/icmp.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/random.h> | |
19 | ||
20 | #include <net/icmp.h> | |
21 | #include <net/inet_hashtables.h> | |
14c85021 | 22 | #include <net/inet_sock.h> |
7c657876 | 23 | #include <net/sock.h> |
6d6ee43e | 24 | #include <net/timewait_sock.h> |
7c657876 ACM |
25 | #include <net/tcp_states.h> |
26 | #include <net/xfrm.h> | |
27 | ||
ae31c339 | 28 | #include "ackvec.h" |
7c657876 ACM |
29 | #include "ccid.h" |
30 | #include "dccp.h" | |
afe00251 | 31 | #include "feat.h" |
7c657876 | 32 | |
7c657876 ACM |
33 | static int dccp_v4_get_port(struct sock *sk, const unsigned short snum) |
34 | { | |
971af18b ACM |
35 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, |
36 | inet_csk_bind_conflict); | |
7c657876 ACM |
37 | } |
38 | ||
f21e68ca | 39 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 ACM |
40 | { |
41 | struct inet_sock *inet = inet_sk(sk); | |
42 | struct dccp_sock *dp = dccp_sk(sk); | |
43 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
44 | struct rtable *rt; | |
45 | u32 daddr, nexthop; | |
46 | int tmp; | |
47 | int err; | |
48 | ||
49 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
50 | ||
67e6b629 ACM |
51 | if (dccp_service_not_initialized(sk)) |
52 | return -EPROTO; | |
53 | ||
7c657876 ACM |
54 | if (addr_len < sizeof(struct sockaddr_in)) |
55 | return -EINVAL; | |
56 | ||
57 | if (usin->sin_family != AF_INET) | |
58 | return -EAFNOSUPPORT; | |
59 | ||
60 | nexthop = daddr = usin->sin_addr.s_addr; | |
61 | if (inet->opt != NULL && inet->opt->srr) { | |
62 | if (daddr == 0) | |
63 | return -EINVAL; | |
64 | nexthop = inet->opt->faddr; | |
65 | } | |
66 | ||
67 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
68 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
69 | IPPROTO_DCCP, | |
70 | inet->sport, usin->sin_port, sk); | |
71 | if (tmp < 0) | |
72 | return tmp; | |
73 | ||
74 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
75 | ip_rt_put(rt); | |
76 | return -ENETUNREACH; | |
77 | } | |
78 | ||
79 | if (inet->opt == NULL || !inet->opt->srr) | |
80 | daddr = rt->rt_dst; | |
81 | ||
82 | if (inet->saddr == 0) | |
83 | inet->saddr = rt->rt_src; | |
84 | inet->rcv_saddr = inet->saddr; | |
85 | ||
86 | inet->dport = usin->sin_port; | |
87 | inet->daddr = daddr; | |
88 | ||
d83d8461 | 89 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 90 | if (inet->opt != NULL) |
d83d8461 | 91 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
92 | /* |
93 | * Socket identity is still unknown (sport may be zero). | |
94 | * However we set state to DCCP_REQUESTING and not releasing socket | |
95 | * lock select source port, enter ourselves into the hash tables and | |
96 | * complete initialization after this. | |
97 | */ | |
98 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 99 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
100 | if (err != 0) |
101 | goto failure; | |
102 | ||
5d39a795 PM |
103 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport, |
104 | sk); | |
7c657876 ACM |
105 | if (err != 0) |
106 | goto failure; | |
107 | ||
108 | /* OK, now commit destination to socket. */ | |
109 | sk_setup_caps(sk, &rt->u.dst); | |
110 | ||
111 | dp->dccps_gar = | |
112 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, | |
113 | inet->daddr, | |
114 | inet->sport, | |
115 | usin->sin_port); | |
116 | dccp_update_gss(sk, dp->dccps_iss); | |
117 | ||
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 | /* | |
181 | * From: draft-ietf-dccp-spec-11.txt | |
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 | ||
191 | static void dccp_v4_ctl_send_ack(struct sk_buff *rxskb) | |
192 | { | |
193 | int err; | |
194 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
195 | const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) + | |
196 | sizeof(struct dccp_hdr_ext) + | |
197 | sizeof(struct dccp_hdr_ack_bits); | |
198 | struct sk_buff *skb; | |
199 | ||
200 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
201 | return; | |
202 | ||
203 | skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC); | |
204 | if (skb == NULL) | |
205 | return; | |
206 | ||
207 | /* Reserve space for headers. */ | |
208 | skb_reserve(skb, MAX_DCCP_HEADER); | |
209 | ||
210 | skb->dst = dst_clone(rxskb->dst); | |
211 | ||
212 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
213 | dh = dccp_hdr(skb); | |
214 | memset(dh, 0, dccp_hdr_ack_len); | |
215 | ||
216 | /* Build DCCP header and checksum it. */ | |
217 | dh->dccph_type = DCCP_PKT_ACK; | |
218 | dh->dccph_sport = rxdh->dccph_dport; | |
219 | dh->dccph_dport = rxdh->dccph_sport; | |
220 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
221 | dh->dccph_x = 1; | |
222 | ||
223 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); | |
7690af3f ACM |
224 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
225 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 ACM |
226 | |
227 | bh_lock_sock(dccp_ctl_socket->sk); | |
228 | err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk, | |
7690af3f ACM |
229 | rxskb->nh.iph->daddr, |
230 | rxskb->nh.iph->saddr, NULL); | |
7c657876 ACM |
231 | bh_unlock_sock(dccp_ctl_socket->sk); |
232 | ||
233 | if (err == NET_XMIT_CN || err == 0) { | |
234 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
235 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
236 | } | |
237 | } | |
238 | ||
7690af3f ACM |
239 | static void dccp_v4_reqsk_send_ack(struct sk_buff *skb, |
240 | struct request_sock *req) | |
7c657876 ACM |
241 | { |
242 | dccp_v4_ctl_send_ack(skb); | |
243 | } | |
244 | ||
245 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, | |
246 | struct dst_entry *dst) | |
247 | { | |
248 | int err = -1; | |
249 | struct sk_buff *skb; | |
250 | ||
251 | /* First, grab a route. */ | |
252 | ||
253 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
254 | goto out; | |
255 | ||
256 | skb = dccp_make_response(sk, dst, req); | |
257 | if (skb != NULL) { | |
258 | const struct inet_request_sock *ireq = inet_rsk(req); | |
0a1ec676 | 259 | struct dccp_hdr *dh = dccp_hdr(skb); |
7c657876 | 260 | |
0a1ec676 ACM |
261 | dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, |
262 | ireq->rmt_addr); | |
49c5bfaf | 263 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
7c657876 ACM |
264 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
265 | ireq->rmt_addr, | |
266 | ireq->opt); | |
267 | if (err == NET_XMIT_CN) | |
268 | err = 0; | |
269 | } | |
270 | ||
271 | out: | |
272 | dst_release(dst); | |
273 | return err; | |
274 | } | |
275 | ||
276 | /* | |
277 | * This routine is called by the ICMP module when it gets some sort of error | |
278 | * condition. If err < 0 then the socket should be closed and the error | |
279 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
280 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
281 | * need to find the appropriate port. | |
282 | * | |
283 | * The locking strategy used here is very "optimistic". When someone else | |
284 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
285 | * check at all. A more general error queue to queue errors for later handling | |
286 | * is probably better. | |
287 | */ | |
288 | void dccp_v4_err(struct sk_buff *skb, u32 info) | |
289 | { | |
290 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
291 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
292 | (iph->ihl << 2)); | |
7c657876 ACM |
293 | struct dccp_sock *dp; |
294 | struct inet_sock *inet; | |
295 | const int type = skb->h.icmph->type; | |
296 | const int code = skb->h.icmph->code; | |
297 | struct sock *sk; | |
298 | __u64 seq; | |
299 | int err; | |
300 | ||
301 | if (skb->len < (iph->ihl << 2) + 8) { | |
302 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
303 | return; | |
304 | } | |
305 | ||
306 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
307 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
308 | if (sk == NULL) { | |
309 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
310 | return; | |
311 | } | |
312 | ||
313 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
314 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
315 | return; | |
316 | } | |
317 | ||
318 | bh_lock_sock(sk); | |
319 | /* If too many ICMPs get dropped on busy | |
320 | * servers this needs to be solved differently. | |
321 | */ | |
322 | if (sock_owned_by_user(sk)) | |
323 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
324 | ||
325 | if (sk->sk_state == DCCP_CLOSED) | |
326 | goto out; | |
327 | ||
328 | dp = dccp_sk(sk); | |
329 | seq = dccp_hdr_seq(skb); | |
330 | if (sk->sk_state != DCCP_LISTEN && | |
331 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
332 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
333 | goto out; | |
334 | } | |
335 | ||
336 | switch (type) { | |
337 | case ICMP_SOURCE_QUENCH: | |
338 | /* Just silently ignore these. */ | |
339 | goto out; | |
340 | case ICMP_PARAMETERPROB: | |
341 | err = EPROTO; | |
342 | break; | |
343 | case ICMP_DEST_UNREACH: | |
344 | if (code > NR_ICMP_UNREACH) | |
345 | goto out; | |
346 | ||
347 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
348 | if (!sock_owned_by_user(sk)) | |
349 | dccp_do_pmtu_discovery(sk, iph, info); | |
350 | goto out; | |
351 | } | |
352 | ||
353 | err = icmp_err_convert[code].errno; | |
354 | break; | |
355 | case ICMP_TIME_EXCEEDED: | |
356 | err = EHOSTUNREACH; | |
357 | break; | |
358 | default: | |
359 | goto out; | |
360 | } | |
361 | ||
362 | switch (sk->sk_state) { | |
363 | struct request_sock *req , **prev; | |
364 | case DCCP_LISTEN: | |
365 | if (sock_owned_by_user(sk)) | |
366 | goto out; | |
367 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
368 | iph->daddr, iph->saddr); | |
369 | if (!req) | |
370 | goto out; | |
371 | ||
372 | /* | |
373 | * ICMPs are not backlogged, hence we cannot get an established | |
374 | * socket here. | |
375 | */ | |
376 | BUG_TRAP(!req->sk); | |
377 | ||
378 | if (seq != dccp_rsk(req)->dreq_iss) { | |
379 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
380 | goto out; | |
381 | } | |
382 | /* | |
383 | * Still in RESPOND, just remove it silently. | |
384 | * There is no good way to pass the error to the newly | |
385 | * created socket, and POSIX does not want network | |
386 | * errors returned from accept(). | |
387 | */ | |
388 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
389 | goto out; | |
390 | ||
391 | case DCCP_REQUESTING: | |
392 | case DCCP_RESPOND: | |
393 | if (!sock_owned_by_user(sk)) { | |
394 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
395 | sk->sk_err = err; | |
396 | ||
397 | sk->sk_error_report(sk); | |
398 | ||
399 | dccp_done(sk); | |
400 | } else | |
401 | sk->sk_err_soft = err; | |
402 | goto out; | |
403 | } | |
404 | ||
405 | /* If we've already connected we will keep trying | |
406 | * until we time out, or the user gives up. | |
407 | * | |
408 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
409 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
410 | * but it is obsoleted by pmtu discovery). | |
411 | * | |
412 | * Note, that in modern internet, where routing is unreliable | |
413 | * and in each dark corner broken firewalls sit, sending random | |
414 | * errors ordered by their masters even this two messages finally lose | |
415 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
416 | * | |
417 | * Now we are in compliance with RFCs. | |
418 | * --ANK (980905) | |
419 | */ | |
420 | ||
421 | inet = inet_sk(sk); | |
422 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
423 | sk->sk_err = err; | |
424 | sk->sk_error_report(sk); | |
425 | } else /* Only an error on timeout */ | |
426 | sk->sk_err_soft = err; | |
427 | out: | |
428 | bh_unlock_sock(sk); | |
429 | sock_put(sk); | |
430 | } | |
431 | ||
57cca05a | 432 | /* This routine computes an IPv4 DCCP checksum. */ |
f21e68ca | 433 | void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
57cca05a ACM |
434 | { |
435 | const struct inet_sock *inet = inet_sk(sk); | |
436 | struct dccp_hdr *dh = dccp_hdr(skb); | |
437 | ||
438 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr); | |
439 | } | |
440 | ||
f21e68ca ACM |
441 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
442 | ||
7c657876 ACM |
443 | static inline u64 dccp_v4_init_sequence(const struct sock *sk, |
444 | const struct sk_buff *skb) | |
445 | { | |
446 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
447 | skb->nh.iph->saddr, | |
448 | dccp_hdr(skb)->dccph_dport, | |
449 | dccp_hdr(skb)->dccph_sport); | |
450 | } | |
451 | ||
452 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
453 | { | |
454 | struct inet_request_sock *ireq; | |
455 | struct dccp_sock dp; | |
456 | struct request_sock *req; | |
457 | struct dccp_request_sock *dreq; | |
60fe62e7 AB |
458 | const __be32 saddr = skb->nh.iph->saddr; |
459 | const __be32 daddr = skb->nh.iph->daddr; | |
460 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; | |
0c10c5d9 ACM |
461 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
462 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
7c657876 ACM |
463 | |
464 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
465 | if (((struct rtable *)skb->dst)->rt_flags & | |
0c10c5d9 ACM |
466 | (RTCF_BROADCAST | RTCF_MULTICAST)) { |
467 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 | 468 | goto drop; |
0c10c5d9 | 469 | } |
7c657876 | 470 | |
67e6b629 ACM |
471 | if (dccp_bad_service_code(sk, service)) { |
472 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
473 | goto drop; | |
474 | } | |
7c657876 ACM |
475 | /* |
476 | * TW buckets are converted to open requests without | |
477 | * limitations, they conserve resources and peer is | |
478 | * evidently real one. | |
479 | */ | |
480 | if (inet_csk_reqsk_queue_is_full(sk)) | |
481 | goto drop; | |
482 | ||
483 | /* | |
484 | * Accept backlog is full. If we have already queued enough | |
485 | * of warm entries in syn queue, drop request. It is better than | |
486 | * clogging syn queue with openreqs with exponentially increasing | |
487 | * timeout. | |
488 | */ | |
489 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
490 | goto drop; | |
491 | ||
492 | req = reqsk_alloc(sk->sk_prot->rsk_prot); | |
493 | if (req == NULL) | |
494 | goto drop; | |
495 | ||
afe00251 AB |
496 | if (dccp_parse_options(sk, skb)) |
497 | goto drop; | |
7c657876 ACM |
498 | |
499 | dccp_openreq_init(req, &dp, skb); | |
500 | ||
501 | ireq = inet_rsk(req); | |
502 | ireq->loc_addr = daddr; | |
503 | ireq->rmt_addr = saddr; | |
7690af3f ACM |
504 | req->rcv_wnd = 100; /* Fake, option parsing will get the |
505 | right value */ | |
7c657876 ACM |
506 | ireq->opt = NULL; |
507 | ||
508 | /* | |
509 | * Step 3: Process LISTEN state | |
510 | * | |
511 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
512 | * | |
513 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
514 | * dccp_create_openreq_child. | |
515 | */ | |
516 | dreq = dccp_rsk(req); | |
67e6b629 ACM |
517 | dreq->dreq_isr = dcb->dccpd_seq; |
518 | dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); | |
519 | dreq->dreq_service = service; | |
7c657876 | 520 | |
f21e68ca | 521 | if (dccp_v4_send_response(sk, req, NULL)) |
7c657876 ACM |
522 | goto drop_and_free; |
523 | ||
524 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
525 | return 0; | |
526 | ||
527 | drop_and_free: | |
fc44b980 | 528 | reqsk_free(req); |
7c657876 ACM |
529 | drop: |
530 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
0c10c5d9 | 531 | dcb->dccpd_reset_code = reset_code; |
7c657876 ACM |
532 | return -1; |
533 | } | |
534 | ||
f21e68ca ACM |
535 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); |
536 | ||
7c657876 ACM |
537 | /* |
538 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
539 | * now create the new socket. | |
540 | * | |
541 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
542 | */ | |
543 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
544 | struct request_sock *req, | |
545 | struct dst_entry *dst) | |
546 | { | |
547 | struct inet_request_sock *ireq; | |
548 | struct inet_sock *newinet; | |
549 | struct dccp_sock *newdp; | |
550 | struct sock *newsk; | |
551 | ||
552 | if (sk_acceptq_is_full(sk)) | |
553 | goto exit_overflow; | |
554 | ||
555 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
556 | goto exit; | |
557 | ||
558 | newsk = dccp_create_openreq_child(sk, req, skb); | |
559 | if (newsk == NULL) | |
560 | goto exit; | |
561 | ||
562 | sk_setup_caps(newsk, dst); | |
563 | ||
564 | newdp = dccp_sk(newsk); | |
565 | newinet = inet_sk(newsk); | |
566 | ireq = inet_rsk(req); | |
567 | newinet->daddr = ireq->rmt_addr; | |
568 | newinet->rcv_saddr = ireq->loc_addr; | |
569 | newinet->saddr = ireq->loc_addr; | |
570 | newinet->opt = ireq->opt; | |
571 | ireq->opt = NULL; | |
572 | newinet->mc_index = inet_iif(skb); | |
573 | newinet->mc_ttl = skb->nh.iph->ttl; | |
574 | newinet->id = jiffies; | |
575 | ||
576 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
577 | ||
578 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
579 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
580 | ||
581 | return newsk; | |
582 | ||
583 | exit_overflow: | |
584 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
585 | exit: | |
586 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
587 | dst_release(dst); | |
588 | return NULL; | |
589 | } | |
590 | ||
f21e68ca ACM |
591 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
592 | ||
7c657876 ACM |
593 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
594 | { | |
595 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
596 | const struct iphdr *iph = skb->nh.iph; | |
597 | struct sock *nsk; | |
598 | struct request_sock **prev; | |
599 | /* Find possible connection requests. */ | |
600 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
601 | dh->dccph_sport, | |
602 | iph->saddr, iph->daddr); | |
603 | if (req != NULL) | |
604 | return dccp_check_req(sk, skb, req, prev); | |
605 | ||
606 | nsk = __inet_lookup_established(&dccp_hashinfo, | |
607 | iph->saddr, dh->dccph_sport, | |
608 | iph->daddr, ntohs(dh->dccph_dport), | |
609 | inet_iif(skb)); | |
610 | if (nsk != NULL) { | |
611 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
612 | bh_lock_sock(nsk); | |
613 | return nsk; | |
614 | } | |
615 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
616 | return NULL; | |
617 | } | |
618 | ||
619 | return sk; | |
620 | } | |
621 | ||
60fe62e7 AB |
622 | int dccp_v4_checksum(const struct sk_buff *skb, const __be32 saddr, |
623 | const __be32 daddr) | |
7c657876 | 624 | { |
95b81ef7 | 625 | const struct dccp_hdr* dh = dccp_hdr(skb); |
7c657876 ACM |
626 | int checksum_len; |
627 | u32 tmp; | |
628 | ||
629 | if (dh->dccph_cscov == 0) | |
630 | checksum_len = skb->len; | |
631 | else { | |
632 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
633 | checksum_len = checksum_len < skb->len ? checksum_len : |
634 | skb->len; | |
7c657876 ACM |
635 | } |
636 | ||
637 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
638 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
639 | IPPROTO_DCCP, tmp); | |
7c657876 ACM |
640 | } |
641 | ||
95b81ef7 | 642 | static int dccp_v4_verify_checksum(struct sk_buff *skb, |
60fe62e7 | 643 | const __be32 saddr, const __be32 daddr) |
7c657876 | 644 | { |
95b81ef7 YN |
645 | struct dccp_hdr *dh = dccp_hdr(skb); |
646 | int checksum_len; | |
647 | u32 tmp; | |
7c657876 | 648 | |
95b81ef7 YN |
649 | if (dh->dccph_cscov == 0) |
650 | checksum_len = skb->len; | |
651 | else { | |
652 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
653 | checksum_len = checksum_len < skb->len ? checksum_len : |
654 | skb->len; | |
95b81ef7 YN |
655 | } |
656 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
657 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
658 | IPPROTO_DCCP, tmp) == 0 ? 0 : -1; | |
7c657876 ACM |
659 | } |
660 | ||
661 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, | |
662 | struct sk_buff *skb) | |
663 | { | |
664 | struct rtable *rt; | |
665 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
666 | .nl_u = { .ip4_u = | |
667 | { .daddr = skb->nh.iph->saddr, | |
668 | .saddr = skb->nh.iph->daddr, | |
669 | .tos = RT_CONN_FLAGS(sk) } }, | |
670 | .proto = sk->sk_protocol, | |
671 | .uli_u = { .ports = | |
672 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
673 | .dport = dccp_hdr(skb)->dccph_sport } |
674 | } | |
675 | }; | |
7c657876 ACM |
676 | |
677 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { | |
678 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | return &rt->u.dst; | |
683 | } | |
684 | ||
a1d3a355 | 685 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
686 | { |
687 | int err; | |
688 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
689 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
690 | sizeof(struct dccp_hdr_ext) + | |
691 | sizeof(struct dccp_hdr_reset); | |
692 | struct sk_buff *skb; | |
693 | struct dst_entry *dst; | |
2807d4ff | 694 | u64 seqno; |
7c657876 ACM |
695 | |
696 | /* Never send a reset in response to a reset. */ | |
697 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
698 | return; | |
699 | ||
700 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
701 | return; | |
702 | ||
703 | dst = dccp_v4_route_skb(dccp_ctl_socket->sk, rxskb); | |
704 | if (dst == NULL) | |
705 | return; | |
706 | ||
707 | skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC); | |
708 | if (skb == NULL) | |
709 | goto out; | |
710 | ||
711 | /* Reserve space for headers. */ | |
712 | skb_reserve(skb, MAX_DCCP_HEADER); | |
713 | skb->dst = dst_clone(dst); | |
714 | ||
715 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
716 | dh = dccp_hdr(skb); | |
717 | memset(dh, 0, dccp_hdr_reset_len); | |
718 | ||
719 | /* Build DCCP header and checksum it. */ | |
720 | dh->dccph_type = DCCP_PKT_RESET; | |
721 | dh->dccph_sport = rxdh->dccph_dport; | |
722 | dh->dccph_dport = rxdh->dccph_sport; | |
723 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
724 | dh->dccph_x = 1; | |
7690af3f ACM |
725 | dccp_hdr_reset(skb)->dccph_reset_code = |
726 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 727 | |
2807d4ff ACM |
728 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ |
729 | seqno = 0; | |
730 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
731 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
732 | ||
733 | dccp_hdr_set_seq(dh, seqno); | |
7690af3f ACM |
734 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
735 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 736 | |
95b81ef7 YN |
737 | dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr, |
738 | rxskb->nh.iph->daddr); | |
7c657876 ACM |
739 | |
740 | bh_lock_sock(dccp_ctl_socket->sk); | |
741 | err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk, | |
7690af3f ACM |
742 | rxskb->nh.iph->daddr, |
743 | rxskb->nh.iph->saddr, NULL); | |
7c657876 ACM |
744 | bh_unlock_sock(dccp_ctl_socket->sk); |
745 | ||
746 | if (err == NET_XMIT_CN || err == 0) { | |
747 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
748 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
749 | } | |
750 | out: | |
751 | dst_release(dst); | |
752 | } | |
753 | ||
754 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
755 | { | |
756 | struct dccp_hdr *dh = dccp_hdr(skb); | |
757 | ||
758 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
759 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
760 | goto reset; | |
761 | return 0; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Step 3: Process LISTEN state | |
766 | * If S.state == LISTEN, | |
7690af3f ACM |
767 | * If P.type == Request or P contains a valid Init Cookie |
768 | * option, | |
7c657876 ACM |
769 | * * Must scan the packet's options to check for an Init |
770 | * Cookie. Only the Init Cookie is processed here, | |
771 | * however; other options are processed in Step 8. This | |
772 | * scan need only be performed if the endpoint uses Init | |
773 | * Cookies * | |
774 | * * Generate a new socket and switch to that socket * | |
775 | * Set S := new socket for this port pair | |
776 | * S.state = RESPOND | |
777 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
778 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
779 | * Continue with S.state == RESPOND | |
780 | * * A Response packet will be generated in Step 11 * | |
781 | * Otherwise, | |
782 | * Generate Reset(No Connection) unless P.type == Reset | |
783 | * Drop packet and return | |
784 | * | |
7690af3f ACM |
785 | * NOTE: the check for the packet types is done in |
786 | * dccp_rcv_state_process | |
7c657876 ACM |
787 | */ |
788 | if (sk->sk_state == DCCP_LISTEN) { | |
789 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
790 | ||
791 | if (nsk == NULL) | |
792 | goto discard; | |
793 | ||
794 | if (nsk != sk) { | |
795 | if (dccp_child_process(sk, nsk, skb)) | |
796 | goto reset; | |
797 | return 0; | |
798 | } | |
799 | } | |
800 | ||
801 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
802 | goto reset; | |
803 | return 0; | |
804 | ||
805 | reset: | |
7c657876 ACM |
806 | dccp_v4_ctl_send_reset(skb); |
807 | discard: | |
808 | kfree_skb(skb); | |
809 | return 0; | |
810 | } | |
811 | ||
f21e68ca ACM |
812 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
813 | ||
814 | int dccp_invalid_packet(struct sk_buff *skb) | |
7c657876 ACM |
815 | { |
816 | const struct dccp_hdr *dh; | |
817 | ||
818 | if (skb->pkt_type != PACKET_HOST) | |
819 | return 1; | |
820 | ||
821 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { | |
c59eab46 | 822 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); |
7c657876 ACM |
823 | return 1; |
824 | } | |
825 | ||
826 | dh = dccp_hdr(skb); | |
827 | ||
828 | /* If the packet type is not understood, drop packet and return */ | |
829 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
c59eab46 | 830 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); |
7c657876 ACM |
831 | return 1; |
832 | } | |
833 | ||
834 | /* | |
835 | * If P.Data Offset is too small for packet type, or too large for | |
836 | * packet, drop packet and return | |
837 | */ | |
838 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
c59eab46 ACM |
839 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
840 | "too small 1\n", | |
841 | dh->dccph_doff); | |
7c657876 ACM |
842 | return 1; |
843 | } | |
844 | ||
845 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { | |
c59eab46 ACM |
846 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
847 | "too small 2\n", | |
848 | dh->dccph_doff); | |
7c657876 ACM |
849 | return 1; |
850 | } | |
851 | ||
852 | dh = dccp_hdr(skb); | |
853 | ||
854 | /* | |
855 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
856 | * has short sequence numbers), drop packet and return | |
857 | */ | |
858 | if (dh->dccph_x == 0 && | |
859 | dh->dccph_type != DCCP_PKT_DATA && | |
860 | dh->dccph_type != DCCP_PKT_ACK && | |
861 | dh->dccph_type != DCCP_PKT_DATAACK) { | |
c59eab46 ACM |
862 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack " |
863 | "nor DataAck and P.X == 0\n", | |
864 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
865 | return 1; |
866 | } | |
867 | ||
7c657876 ACM |
868 | return 0; |
869 | } | |
870 | ||
f21e68ca ACM |
871 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
872 | ||
7c657876 ACM |
873 | /* this is called when real data arrives */ |
874 | int dccp_v4_rcv(struct sk_buff *skb) | |
875 | { | |
876 | const struct dccp_hdr *dh; | |
877 | struct sock *sk; | |
7c657876 ACM |
878 | |
879 | /* Step 1: Check header basics: */ | |
880 | ||
881 | if (dccp_invalid_packet(skb)) | |
882 | goto discard_it; | |
883 | ||
f21e68ca ACM |
884 | /* If the header checksum is incorrect, drop packet and return */ |
885 | if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr, | |
886 | skb->nh.iph->daddr) < 0) { | |
887 | LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n", | |
888 | __FUNCTION__); | |
889 | goto discard_it; | |
890 | } | |
891 | ||
7c657876 | 892 | dh = dccp_hdr(skb); |
7c657876 | 893 | |
7c657876 ACM |
894 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
895 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
896 | ||
897 | dccp_pr_debug("%8.8s " | |
898 | "src=%u.%u.%u.%u@%-5d " | |
899 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
900 | dccp_packet_name(dh->dccph_type), | |
901 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
902 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 903 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
904 | |
905 | if (dccp_packet_without_ack(skb)) { | |
906 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
907 | dccp_pr_debug_cat("\n"); | |
908 | } else { | |
909 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
f6ccf554 DM |
910 | dccp_pr_debug_cat(", ack=%llu\n", |
911 | (unsigned long long) | |
912 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
7c657876 ACM |
913 | } |
914 | ||
915 | /* Step 2: | |
916 | * Look up flow ID in table and get corresponding socket */ | |
917 | sk = __inet_lookup(&dccp_hashinfo, | |
918 | skb->nh.iph->saddr, dh->dccph_sport, | |
919 | skb->nh.iph->daddr, ntohs(dh->dccph_dport), | |
920 | inet_iif(skb)); | |
921 | ||
922 | /* | |
923 | * Step 2: | |
924 | * If no socket ... | |
925 | * Generate Reset(No Connection) unless P.type == Reset | |
926 | * Drop packet and return | |
927 | */ | |
928 | if (sk == NULL) { | |
929 | dccp_pr_debug("failed to look up flow ID in table and " | |
930 | "get corresponding socket\n"); | |
931 | goto no_dccp_socket; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Step 2: | |
936 | * ... or S.state == TIMEWAIT, | |
937 | * Generate Reset(No Connection) unless P.type == Reset | |
938 | * Drop packet and return | |
939 | */ | |
940 | ||
941 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
64cf1e5d ACM |
942 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: " |
943 | "do_time_wait\n"); | |
944 | goto do_time_wait; | |
7c657876 ACM |
945 | } |
946 | ||
25995ff5 | 947 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 948 | goto discard_and_relse; |
eb9c7ebe | 949 | nf_reset(skb); |
7c657876 | 950 | |
25995ff5 | 951 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
952 | |
953 | no_dccp_socket: | |
954 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
955 | goto discard_it; | |
956 | /* | |
957 | * Step 2: | |
958 | * Generate Reset(No Connection) unless P.type == Reset | |
959 | * Drop packet and return | |
960 | */ | |
961 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
962 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
963 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
964 | dccp_v4_ctl_send_reset(skb); |
965 | } | |
966 | ||
967 | discard_it: | |
968 | /* Discard frame. */ | |
969 | kfree_skb(skb); | |
970 | return 0; | |
971 | ||
972 | discard_and_relse: | |
973 | sock_put(sk); | |
974 | goto discard_it; | |
64cf1e5d ACM |
975 | |
976 | do_time_wait: | |
977 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
978 | goto no_dccp_socket; | |
7c657876 ACM |
979 | } |
980 | ||
57cca05a ACM |
981 | struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
982 | .queue_xmit = ip_queue_xmit, | |
983 | .send_check = dccp_v4_send_check, | |
984 | .rebuild_header = inet_sk_rebuild_header, | |
985 | .conn_request = dccp_v4_conn_request, | |
986 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
987 | .net_header_len = sizeof(struct iphdr), | |
988 | .setsockopt = ip_setsockopt, | |
989 | .getsockopt = ip_getsockopt, | |
990 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
991 | .sockaddr_len = sizeof(struct sockaddr_in), | |
992 | }; | |
993 | ||
3e0fadc5 | 994 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 995 | { |
3e0fadc5 | 996 | const int err = dccp_init_sock(sk); |
f21e68ca | 997 | |
3e0fadc5 ACM |
998 | if (err == 0) |
999 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; | |
1000 | return err; | |
7c657876 ACM |
1001 | } |
1002 | ||
1003 | static void dccp_v4_reqsk_destructor(struct request_sock *req) | |
1004 | { | |
1005 | kfree(inet_rsk(req)->opt); | |
1006 | } | |
1007 | ||
1008 | static struct request_sock_ops dccp_request_sock_ops = { | |
1009 | .family = PF_INET, | |
1010 | .obj_size = sizeof(struct dccp_request_sock), | |
1011 | .rtx_syn_ack = dccp_v4_send_response, | |
1012 | .send_ack = dccp_v4_reqsk_send_ack, | |
1013 | .destructor = dccp_v4_reqsk_destructor, | |
1014 | .send_reset = dccp_v4_ctl_send_reset, | |
1015 | }; | |
1016 | ||
6d6ee43e ACM |
1017 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
1018 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
1019 | }; | |
1020 | ||
34ca6860 | 1021 | struct proto dccp_prot = { |
7c657876 ACM |
1022 | .name = "DCCP", |
1023 | .owner = THIS_MODULE, | |
1024 | .close = dccp_close, | |
1025 | .connect = dccp_v4_connect, | |
1026 | .disconnect = dccp_disconnect, | |
1027 | .ioctl = dccp_ioctl, | |
1028 | .init = dccp_v4_init_sock, | |
1029 | .setsockopt = dccp_setsockopt, | |
1030 | .getsockopt = dccp_getsockopt, | |
1031 | .sendmsg = dccp_sendmsg, | |
1032 | .recvmsg = dccp_recvmsg, | |
1033 | .backlog_rcv = dccp_v4_do_rcv, | |
c985ed70 | 1034 | .hash = dccp_hash, |
f21e68ca | 1035 | .unhash = dccp_unhash, |
7c657876 ACM |
1036 | .accept = inet_csk_accept, |
1037 | .get_port = dccp_v4_get_port, | |
1038 | .shutdown = dccp_shutdown, | |
3e0fadc5 | 1039 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
1040 | .orphan_count = &dccp_orphan_count, |
1041 | .max_header = MAX_DCCP_HEADER, | |
1042 | .obj_size = sizeof(struct dccp_sock), | |
1043 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 1044 | .twsk_prot = &dccp_timewait_sock_ops, |
7c657876 | 1045 | }; |
6d6ee43e ACM |
1046 | |
1047 | EXPORT_SYMBOL_GPL(dccp_prot); |