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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" | |
31 | ||
32 | struct inet_hashinfo __cacheline_aligned dccp_hashinfo = { | |
33 | .lhash_lock = RW_LOCK_UNLOCKED, | |
34 | .lhash_users = ATOMIC_INIT(0), | |
7690af3f | 35 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait), |
7c657876 ACM |
36 | }; |
37 | ||
540722ff ACM |
38 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
39 | ||
7c657876 ACM |
40 | static int dccp_v4_get_port(struct sock *sk, const unsigned short snum) |
41 | { | |
971af18b ACM |
42 | return inet_csk_get_port(&dccp_hashinfo, sk, snum, |
43 | inet_csk_bind_conflict); | |
7c657876 ACM |
44 | } |
45 | ||
46 | static void dccp_v4_hash(struct sock *sk) | |
47 | { | |
48 | inet_hash(&dccp_hashinfo, sk); | |
49 | } | |
50 | ||
f21e68ca | 51 | void dccp_unhash(struct sock *sk) |
7c657876 ACM |
52 | { |
53 | inet_unhash(&dccp_hashinfo, sk); | |
54 | } | |
55 | ||
f21e68ca ACM |
56 | EXPORT_SYMBOL_GPL(dccp_unhash); |
57 | ||
f21e68ca | 58 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 ACM |
59 | { |
60 | struct inet_sock *inet = inet_sk(sk); | |
61 | struct dccp_sock *dp = dccp_sk(sk); | |
62 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
63 | struct rtable *rt; | |
64 | u32 daddr, nexthop; | |
65 | int tmp; | |
66 | int err; | |
67 | ||
68 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
69 | ||
67e6b629 ACM |
70 | if (dccp_service_not_initialized(sk)) |
71 | return -EPROTO; | |
72 | ||
7c657876 ACM |
73 | if (addr_len < sizeof(struct sockaddr_in)) |
74 | return -EINVAL; | |
75 | ||
76 | if (usin->sin_family != AF_INET) | |
77 | return -EAFNOSUPPORT; | |
78 | ||
79 | nexthop = daddr = usin->sin_addr.s_addr; | |
80 | if (inet->opt != NULL && inet->opt->srr) { | |
81 | if (daddr == 0) | |
82 | return -EINVAL; | |
83 | nexthop = inet->opt->faddr; | |
84 | } | |
85 | ||
86 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
87 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
88 | IPPROTO_DCCP, | |
89 | inet->sport, usin->sin_port, sk); | |
90 | if (tmp < 0) | |
91 | return tmp; | |
92 | ||
93 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
94 | ip_rt_put(rt); | |
95 | return -ENETUNREACH; | |
96 | } | |
97 | ||
98 | if (inet->opt == NULL || !inet->opt->srr) | |
99 | daddr = rt->rt_dst; | |
100 | ||
101 | if (inet->saddr == 0) | |
102 | inet->saddr = rt->rt_src; | |
103 | inet->rcv_saddr = inet->saddr; | |
104 | ||
105 | inet->dport = usin->sin_port; | |
106 | inet->daddr = daddr; | |
107 | ||
d83d8461 | 108 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 109 | if (inet->opt != NULL) |
d83d8461 | 110 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
111 | /* |
112 | * Socket identity is still unknown (sport may be zero). | |
113 | * However we set state to DCCP_REQUESTING and not releasing socket | |
114 | * lock select source port, enter ourselves into the hash tables and | |
115 | * complete initialization after this. | |
116 | */ | |
117 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 118 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
119 | if (err != 0) |
120 | goto failure; | |
121 | ||
122 | err = ip_route_newports(&rt, inet->sport, inet->dport, sk); | |
123 | if (err != 0) | |
124 | goto failure; | |
125 | ||
126 | /* OK, now commit destination to socket. */ | |
127 | sk_setup_caps(sk, &rt->u.dst); | |
128 | ||
129 | dp->dccps_gar = | |
130 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, | |
131 | inet->daddr, | |
132 | inet->sport, | |
133 | usin->sin_port); | |
134 | dccp_update_gss(sk, dp->dccps_iss); | |
135 | ||
136 | inet->id = dp->dccps_iss ^ jiffies; | |
137 | ||
138 | err = dccp_connect(sk); | |
139 | rt = NULL; | |
140 | if (err != 0) | |
141 | goto failure; | |
142 | out: | |
143 | return err; | |
144 | failure: | |
7690af3f ACM |
145 | /* |
146 | * This unhashes the socket and releases the local port, if necessary. | |
147 | */ | |
7c657876 ACM |
148 | dccp_set_state(sk, DCCP_CLOSED); |
149 | ip_rt_put(rt); | |
150 | sk->sk_route_caps = 0; | |
151 | inet->dport = 0; | |
152 | goto out; | |
153 | } | |
154 | ||
f21e68ca ACM |
155 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
156 | ||
7c657876 ACM |
157 | /* |
158 | * This routine does path mtu discovery as defined in RFC1191. | |
159 | */ | |
160 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
161 | const struct iphdr *iph, | |
162 | u32 mtu) | |
163 | { | |
164 | struct dst_entry *dst; | |
165 | const struct inet_sock *inet = inet_sk(sk); | |
166 | const struct dccp_sock *dp = dccp_sk(sk); | |
167 | ||
168 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
169 | * send out by Linux are always < 576bytes so they should go through | |
170 | * unfragmented). | |
171 | */ | |
172 | if (sk->sk_state == DCCP_LISTEN) | |
173 | return; | |
174 | ||
175 | /* We don't check in the destentry if pmtu discovery is forbidden | |
176 | * on this route. We just assume that no packet_to_big packets | |
177 | * are send back when pmtu discovery is not active. | |
178 | * There is a small race when the user changes this flag in the | |
179 | * route, but I think that's acceptable. | |
180 | */ | |
181 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
182 | return; | |
183 | ||
184 | dst->ops->update_pmtu(dst, mtu); | |
185 | ||
186 | /* Something is about to be wrong... Remember soft error | |
187 | * for the case, if this connection will not able to recover. | |
188 | */ | |
189 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
190 | sk->sk_err_soft = EMSGSIZE; | |
191 | ||
192 | mtu = dst_mtu(dst); | |
193 | ||
194 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 195 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
196 | dccp_sync_mss(sk, mtu); |
197 | ||
198 | /* | |
199 | * From: draft-ietf-dccp-spec-11.txt | |
200 | * | |
7690af3f ACM |
201 | * DCCP-Sync packets are the best choice for upward |
202 | * probing, since DCCP-Sync probes do not risk application | |
203 | * data loss. | |
7c657876 | 204 | */ |
e92ae93a | 205 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
206 | } /* else let the usual retransmit timer handle it */ |
207 | } | |
208 | ||
209 | static void dccp_v4_ctl_send_ack(struct sk_buff *rxskb) | |
210 | { | |
211 | int err; | |
212 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
213 | const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) + | |
214 | sizeof(struct dccp_hdr_ext) + | |
215 | sizeof(struct dccp_hdr_ack_bits); | |
216 | struct sk_buff *skb; | |
217 | ||
218 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
219 | return; | |
220 | ||
221 | skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC); | |
222 | if (skb == NULL) | |
223 | return; | |
224 | ||
225 | /* Reserve space for headers. */ | |
226 | skb_reserve(skb, MAX_DCCP_HEADER); | |
227 | ||
228 | skb->dst = dst_clone(rxskb->dst); | |
229 | ||
230 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
231 | dh = dccp_hdr(skb); | |
232 | memset(dh, 0, dccp_hdr_ack_len); | |
233 | ||
234 | /* Build DCCP header and checksum it. */ | |
235 | dh->dccph_type = DCCP_PKT_ACK; | |
236 | dh->dccph_sport = rxdh->dccph_dport; | |
237 | dh->dccph_dport = rxdh->dccph_sport; | |
238 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
239 | dh->dccph_x = 1; | |
240 | ||
241 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); | |
7690af3f ACM |
242 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
243 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 ACM |
244 | |
245 | bh_lock_sock(dccp_ctl_socket->sk); | |
246 | err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk, | |
7690af3f ACM |
247 | rxskb->nh.iph->daddr, |
248 | rxskb->nh.iph->saddr, NULL); | |
7c657876 ACM |
249 | bh_unlock_sock(dccp_ctl_socket->sk); |
250 | ||
251 | if (err == NET_XMIT_CN || err == 0) { | |
252 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
253 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
254 | } | |
255 | } | |
256 | ||
7690af3f ACM |
257 | static void dccp_v4_reqsk_send_ack(struct sk_buff *skb, |
258 | struct request_sock *req) | |
7c657876 ACM |
259 | { |
260 | dccp_v4_ctl_send_ack(skb); | |
261 | } | |
262 | ||
263 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, | |
264 | struct dst_entry *dst) | |
265 | { | |
266 | int err = -1; | |
267 | struct sk_buff *skb; | |
268 | ||
269 | /* First, grab a route. */ | |
270 | ||
271 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
272 | goto out; | |
273 | ||
274 | skb = dccp_make_response(sk, dst, req); | |
275 | if (skb != NULL) { | |
276 | const struct inet_request_sock *ireq = inet_rsk(req); | |
277 | ||
49c5bfaf | 278 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
7c657876 ACM |
279 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
280 | ireq->rmt_addr, | |
281 | ireq->opt); | |
282 | if (err == NET_XMIT_CN) | |
283 | err = 0; | |
284 | } | |
285 | ||
286 | out: | |
287 | dst_release(dst); | |
288 | return err; | |
289 | } | |
290 | ||
291 | /* | |
292 | * This routine is called by the ICMP module when it gets some sort of error | |
293 | * condition. If err < 0 then the socket should be closed and the error | |
294 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
295 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
296 | * need to find the appropriate port. | |
297 | * | |
298 | * The locking strategy used here is very "optimistic". When someone else | |
299 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
300 | * check at all. A more general error queue to queue errors for later handling | |
301 | * is probably better. | |
302 | */ | |
303 | void dccp_v4_err(struct sk_buff *skb, u32 info) | |
304 | { | |
305 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
306 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
307 | (iph->ihl << 2)); | |
7c657876 ACM |
308 | struct dccp_sock *dp; |
309 | struct inet_sock *inet; | |
310 | const int type = skb->h.icmph->type; | |
311 | const int code = skb->h.icmph->code; | |
312 | struct sock *sk; | |
313 | __u64 seq; | |
314 | int err; | |
315 | ||
316 | if (skb->len < (iph->ihl << 2) + 8) { | |
317 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
318 | return; | |
319 | } | |
320 | ||
321 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
322 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
323 | if (sk == NULL) { | |
324 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
325 | return; | |
326 | } | |
327 | ||
328 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
329 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
330 | return; | |
331 | } | |
332 | ||
333 | bh_lock_sock(sk); | |
334 | /* If too many ICMPs get dropped on busy | |
335 | * servers this needs to be solved differently. | |
336 | */ | |
337 | if (sock_owned_by_user(sk)) | |
338 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
339 | ||
340 | if (sk->sk_state == DCCP_CLOSED) | |
341 | goto out; | |
342 | ||
343 | dp = dccp_sk(sk); | |
344 | seq = dccp_hdr_seq(skb); | |
345 | if (sk->sk_state != DCCP_LISTEN && | |
346 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
347 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
348 | goto out; | |
349 | } | |
350 | ||
351 | switch (type) { | |
352 | case ICMP_SOURCE_QUENCH: | |
353 | /* Just silently ignore these. */ | |
354 | goto out; | |
355 | case ICMP_PARAMETERPROB: | |
356 | err = EPROTO; | |
357 | break; | |
358 | case ICMP_DEST_UNREACH: | |
359 | if (code > NR_ICMP_UNREACH) | |
360 | goto out; | |
361 | ||
362 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
363 | if (!sock_owned_by_user(sk)) | |
364 | dccp_do_pmtu_discovery(sk, iph, info); | |
365 | goto out; | |
366 | } | |
367 | ||
368 | err = icmp_err_convert[code].errno; | |
369 | break; | |
370 | case ICMP_TIME_EXCEEDED: | |
371 | err = EHOSTUNREACH; | |
372 | break; | |
373 | default: | |
374 | goto out; | |
375 | } | |
376 | ||
377 | switch (sk->sk_state) { | |
378 | struct request_sock *req , **prev; | |
379 | case DCCP_LISTEN: | |
380 | if (sock_owned_by_user(sk)) | |
381 | goto out; | |
382 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
383 | iph->daddr, iph->saddr); | |
384 | if (!req) | |
385 | goto out; | |
386 | ||
387 | /* | |
388 | * ICMPs are not backlogged, hence we cannot get an established | |
389 | * socket here. | |
390 | */ | |
391 | BUG_TRAP(!req->sk); | |
392 | ||
393 | if (seq != dccp_rsk(req)->dreq_iss) { | |
394 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
395 | goto out; | |
396 | } | |
397 | /* | |
398 | * Still in RESPOND, just remove it silently. | |
399 | * There is no good way to pass the error to the newly | |
400 | * created socket, and POSIX does not want network | |
401 | * errors returned from accept(). | |
402 | */ | |
403 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
404 | goto out; | |
405 | ||
406 | case DCCP_REQUESTING: | |
407 | case DCCP_RESPOND: | |
408 | if (!sock_owned_by_user(sk)) { | |
409 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
410 | sk->sk_err = err; | |
411 | ||
412 | sk->sk_error_report(sk); | |
413 | ||
414 | dccp_done(sk); | |
415 | } else | |
416 | sk->sk_err_soft = err; | |
417 | goto out; | |
418 | } | |
419 | ||
420 | /* If we've already connected we will keep trying | |
421 | * until we time out, or the user gives up. | |
422 | * | |
423 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
424 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
425 | * but it is obsoleted by pmtu discovery). | |
426 | * | |
427 | * Note, that in modern internet, where routing is unreliable | |
428 | * and in each dark corner broken firewalls sit, sending random | |
429 | * errors ordered by their masters even this two messages finally lose | |
430 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
431 | * | |
432 | * Now we are in compliance with RFCs. | |
433 | * --ANK (980905) | |
434 | */ | |
435 | ||
436 | inet = inet_sk(sk); | |
437 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
438 | sk->sk_err = err; | |
439 | sk->sk_error_report(sk); | |
440 | } else /* Only an error on timeout */ | |
441 | sk->sk_err_soft = err; | |
442 | out: | |
443 | bh_unlock_sock(sk); | |
444 | sock_put(sk); | |
445 | } | |
446 | ||
57cca05a | 447 | /* This routine computes an IPv4 DCCP checksum. */ |
f21e68ca | 448 | void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
57cca05a ACM |
449 | { |
450 | const struct inet_sock *inet = inet_sk(sk); | |
451 | struct dccp_hdr *dh = dccp_hdr(skb); | |
452 | ||
453 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr); | |
454 | } | |
455 | ||
f21e68ca ACM |
456 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
457 | ||
7c657876 ACM |
458 | int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code) |
459 | { | |
460 | struct sk_buff *skb; | |
461 | /* | |
462 | * FIXME: what if rebuild_header fails? | |
463 | * Should we be doing a rebuild_header here? | |
464 | */ | |
465 | int err = inet_sk_rebuild_header(sk); | |
466 | ||
467 | if (err != 0) | |
468 | return err; | |
469 | ||
470 | skb = dccp_make_reset(sk, sk->sk_dst_cache, code); | |
471 | if (skb != NULL) { | |
7c657876 ACM |
472 | const struct inet_sock *inet = inet_sk(sk); |
473 | ||
49c5bfaf | 474 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
7c657876 ACM |
475 | err = ip_build_and_send_pkt(skb, sk, |
476 | inet->saddr, inet->daddr, NULL); | |
477 | if (err == NET_XMIT_CN) | |
478 | err = 0; | |
7c657876 ACM |
479 | } |
480 | ||
481 | return err; | |
482 | } | |
483 | ||
484 | static inline u64 dccp_v4_init_sequence(const struct sock *sk, | |
485 | const struct sk_buff *skb) | |
486 | { | |
487 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
488 | skb->nh.iph->saddr, | |
489 | dccp_hdr(skb)->dccph_dport, | |
490 | dccp_hdr(skb)->dccph_sport); | |
491 | } | |
492 | ||
493 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
494 | { | |
495 | struct inet_request_sock *ireq; | |
496 | struct dccp_sock dp; | |
497 | struct request_sock *req; | |
498 | struct dccp_request_sock *dreq; | |
499 | const __u32 saddr = skb->nh.iph->saddr; | |
500 | const __u32 daddr = skb->nh.iph->daddr; | |
67e6b629 | 501 | const __u32 service = dccp_hdr_request(skb)->dccph_req_service; |
0c10c5d9 ACM |
502 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
503 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
7c657876 ACM |
504 | |
505 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
506 | if (((struct rtable *)skb->dst)->rt_flags & | |
0c10c5d9 ACM |
507 | (RTCF_BROADCAST | RTCF_MULTICAST)) { |
508 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 | 509 | goto drop; |
0c10c5d9 | 510 | } |
7c657876 | 511 | |
67e6b629 ACM |
512 | if (dccp_bad_service_code(sk, service)) { |
513 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
514 | goto drop; | |
515 | } | |
7c657876 ACM |
516 | /* |
517 | * TW buckets are converted to open requests without | |
518 | * limitations, they conserve resources and peer is | |
519 | * evidently real one. | |
520 | */ | |
521 | if (inet_csk_reqsk_queue_is_full(sk)) | |
522 | goto drop; | |
523 | ||
524 | /* | |
525 | * Accept backlog is full. If we have already queued enough | |
526 | * of warm entries in syn queue, drop request. It is better than | |
527 | * clogging syn queue with openreqs with exponentially increasing | |
528 | * timeout. | |
529 | */ | |
530 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
531 | goto drop; | |
532 | ||
533 | req = reqsk_alloc(sk->sk_prot->rsk_prot); | |
534 | if (req == NULL) | |
535 | goto drop; | |
536 | ||
537 | /* FIXME: process options */ | |
538 | ||
539 | dccp_openreq_init(req, &dp, skb); | |
540 | ||
541 | ireq = inet_rsk(req); | |
542 | ireq->loc_addr = daddr; | |
543 | ireq->rmt_addr = saddr; | |
7690af3f ACM |
544 | req->rcv_wnd = 100; /* Fake, option parsing will get the |
545 | right value */ | |
7c657876 ACM |
546 | ireq->opt = NULL; |
547 | ||
548 | /* | |
549 | * Step 3: Process LISTEN state | |
550 | * | |
551 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
552 | * | |
553 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
554 | * dccp_create_openreq_child. | |
555 | */ | |
556 | dreq = dccp_rsk(req); | |
67e6b629 ACM |
557 | dreq->dreq_isr = dcb->dccpd_seq; |
558 | dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); | |
559 | dreq->dreq_service = service; | |
7c657876 | 560 | |
f21e68ca | 561 | if (dccp_v4_send_response(sk, req, NULL)) |
7c657876 ACM |
562 | goto drop_and_free; |
563 | ||
564 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
565 | return 0; | |
566 | ||
567 | drop_and_free: | |
fc44b980 | 568 | reqsk_free(req); |
7c657876 ACM |
569 | drop: |
570 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
0c10c5d9 | 571 | dcb->dccpd_reset_code = reset_code; |
7c657876 ACM |
572 | return -1; |
573 | } | |
574 | ||
f21e68ca ACM |
575 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); |
576 | ||
7c657876 ACM |
577 | /* |
578 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
579 | * now create the new socket. | |
580 | * | |
581 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
582 | */ | |
583 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
584 | struct request_sock *req, | |
585 | struct dst_entry *dst) | |
586 | { | |
587 | struct inet_request_sock *ireq; | |
588 | struct inet_sock *newinet; | |
589 | struct dccp_sock *newdp; | |
590 | struct sock *newsk; | |
591 | ||
592 | if (sk_acceptq_is_full(sk)) | |
593 | goto exit_overflow; | |
594 | ||
595 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
596 | goto exit; | |
597 | ||
598 | newsk = dccp_create_openreq_child(sk, req, skb); | |
599 | if (newsk == NULL) | |
600 | goto exit; | |
601 | ||
602 | sk_setup_caps(newsk, dst); | |
603 | ||
604 | newdp = dccp_sk(newsk); | |
605 | newinet = inet_sk(newsk); | |
606 | ireq = inet_rsk(req); | |
607 | newinet->daddr = ireq->rmt_addr; | |
608 | newinet->rcv_saddr = ireq->loc_addr; | |
609 | newinet->saddr = ireq->loc_addr; | |
610 | newinet->opt = ireq->opt; | |
611 | ireq->opt = NULL; | |
612 | newinet->mc_index = inet_iif(skb); | |
613 | newinet->mc_ttl = skb->nh.iph->ttl; | |
614 | newinet->id = jiffies; | |
615 | ||
616 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
617 | ||
618 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
619 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
620 | ||
621 | return newsk; | |
622 | ||
623 | exit_overflow: | |
624 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
625 | exit: | |
626 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
627 | dst_release(dst); | |
628 | return NULL; | |
629 | } | |
630 | ||
f21e68ca ACM |
631 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
632 | ||
7c657876 ACM |
633 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
634 | { | |
635 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
636 | const struct iphdr *iph = skb->nh.iph; | |
637 | struct sock *nsk; | |
638 | struct request_sock **prev; | |
639 | /* Find possible connection requests. */ | |
640 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
641 | dh->dccph_sport, | |
642 | iph->saddr, iph->daddr); | |
643 | if (req != NULL) | |
644 | return dccp_check_req(sk, skb, req, prev); | |
645 | ||
646 | nsk = __inet_lookup_established(&dccp_hashinfo, | |
647 | iph->saddr, dh->dccph_sport, | |
648 | iph->daddr, ntohs(dh->dccph_dport), | |
649 | inet_iif(skb)); | |
650 | if (nsk != NULL) { | |
651 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
652 | bh_lock_sock(nsk); | |
653 | return nsk; | |
654 | } | |
655 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
656 | return NULL; | |
657 | } | |
658 | ||
659 | return sk; | |
660 | } | |
661 | ||
7690af3f ACM |
662 | int dccp_v4_checksum(const struct sk_buff *skb, const u32 saddr, |
663 | const u32 daddr) | |
7c657876 | 664 | { |
95b81ef7 | 665 | const struct dccp_hdr* dh = dccp_hdr(skb); |
7c657876 ACM |
666 | int checksum_len; |
667 | u32 tmp; | |
668 | ||
669 | if (dh->dccph_cscov == 0) | |
670 | checksum_len = skb->len; | |
671 | else { | |
672 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
673 | checksum_len = checksum_len < skb->len ? checksum_len : |
674 | skb->len; | |
7c657876 ACM |
675 | } |
676 | ||
677 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
678 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
679 | IPPROTO_DCCP, tmp); | |
7c657876 ACM |
680 | } |
681 | ||
95b81ef7 YN |
682 | static int dccp_v4_verify_checksum(struct sk_buff *skb, |
683 | const u32 saddr, const u32 daddr) | |
7c657876 | 684 | { |
95b81ef7 YN |
685 | struct dccp_hdr *dh = dccp_hdr(skb); |
686 | int checksum_len; | |
687 | u32 tmp; | |
7c657876 | 688 | |
95b81ef7 YN |
689 | if (dh->dccph_cscov == 0) |
690 | checksum_len = skb->len; | |
691 | else { | |
692 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
693 | checksum_len = checksum_len < skb->len ? checksum_len : |
694 | skb->len; | |
95b81ef7 YN |
695 | } |
696 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
697 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
698 | IPPROTO_DCCP, tmp) == 0 ? 0 : -1; | |
7c657876 ACM |
699 | } |
700 | ||
701 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, | |
702 | struct sk_buff *skb) | |
703 | { | |
704 | struct rtable *rt; | |
705 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
706 | .nl_u = { .ip4_u = | |
707 | { .daddr = skb->nh.iph->saddr, | |
708 | .saddr = skb->nh.iph->daddr, | |
709 | .tos = RT_CONN_FLAGS(sk) } }, | |
710 | .proto = sk->sk_protocol, | |
711 | .uli_u = { .ports = | |
712 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
713 | .dport = dccp_hdr(skb)->dccph_sport } |
714 | } | |
715 | }; | |
7c657876 ACM |
716 | |
717 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { | |
718 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
719 | return NULL; | |
720 | } | |
721 | ||
722 | return &rt->u.dst; | |
723 | } | |
724 | ||
a1d3a355 | 725 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
726 | { |
727 | int err; | |
728 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
729 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
730 | sizeof(struct dccp_hdr_ext) + | |
731 | sizeof(struct dccp_hdr_reset); | |
732 | struct sk_buff *skb; | |
733 | struct dst_entry *dst; | |
2807d4ff | 734 | u64 seqno; |
7c657876 ACM |
735 | |
736 | /* Never send a reset in response to a reset. */ | |
737 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
738 | return; | |
739 | ||
740 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
741 | return; | |
742 | ||
743 | dst = dccp_v4_route_skb(dccp_ctl_socket->sk, rxskb); | |
744 | if (dst == NULL) | |
745 | return; | |
746 | ||
747 | skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC); | |
748 | if (skb == NULL) | |
749 | goto out; | |
750 | ||
751 | /* Reserve space for headers. */ | |
752 | skb_reserve(skb, MAX_DCCP_HEADER); | |
753 | skb->dst = dst_clone(dst); | |
754 | ||
755 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
756 | dh = dccp_hdr(skb); | |
757 | memset(dh, 0, dccp_hdr_reset_len); | |
758 | ||
759 | /* Build DCCP header and checksum it. */ | |
760 | dh->dccph_type = DCCP_PKT_RESET; | |
761 | dh->dccph_sport = rxdh->dccph_dport; | |
762 | dh->dccph_dport = rxdh->dccph_sport; | |
763 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
764 | dh->dccph_x = 1; | |
7690af3f ACM |
765 | dccp_hdr_reset(skb)->dccph_reset_code = |
766 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 767 | |
2807d4ff ACM |
768 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ |
769 | seqno = 0; | |
770 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
771 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
772 | ||
773 | dccp_hdr_set_seq(dh, seqno); | |
7690af3f ACM |
774 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
775 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 776 | |
95b81ef7 YN |
777 | dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr, |
778 | rxskb->nh.iph->daddr); | |
7c657876 ACM |
779 | |
780 | bh_lock_sock(dccp_ctl_socket->sk); | |
781 | err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk, | |
7690af3f ACM |
782 | rxskb->nh.iph->daddr, |
783 | rxskb->nh.iph->saddr, NULL); | |
7c657876 ACM |
784 | bh_unlock_sock(dccp_ctl_socket->sk); |
785 | ||
786 | if (err == NET_XMIT_CN || err == 0) { | |
787 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
788 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
789 | } | |
790 | out: | |
791 | dst_release(dst); | |
792 | } | |
793 | ||
794 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
795 | { | |
796 | struct dccp_hdr *dh = dccp_hdr(skb); | |
797 | ||
798 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
799 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
800 | goto reset; | |
801 | return 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * Step 3: Process LISTEN state | |
806 | * If S.state == LISTEN, | |
7690af3f ACM |
807 | * If P.type == Request or P contains a valid Init Cookie |
808 | * option, | |
7c657876 ACM |
809 | * * Must scan the packet's options to check for an Init |
810 | * Cookie. Only the Init Cookie is processed here, | |
811 | * however; other options are processed in Step 8. This | |
812 | * scan need only be performed if the endpoint uses Init | |
813 | * Cookies * | |
814 | * * Generate a new socket and switch to that socket * | |
815 | * Set S := new socket for this port pair | |
816 | * S.state = RESPOND | |
817 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
818 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
819 | * Continue with S.state == RESPOND | |
820 | * * A Response packet will be generated in Step 11 * | |
821 | * Otherwise, | |
822 | * Generate Reset(No Connection) unless P.type == Reset | |
823 | * Drop packet and return | |
824 | * | |
7690af3f ACM |
825 | * NOTE: the check for the packet types is done in |
826 | * dccp_rcv_state_process | |
7c657876 ACM |
827 | */ |
828 | if (sk->sk_state == DCCP_LISTEN) { | |
829 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
830 | ||
831 | if (nsk == NULL) | |
832 | goto discard; | |
833 | ||
834 | if (nsk != sk) { | |
835 | if (dccp_child_process(sk, nsk, skb)) | |
836 | goto reset; | |
837 | return 0; | |
838 | } | |
839 | } | |
840 | ||
841 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
842 | goto reset; | |
843 | return 0; | |
844 | ||
845 | reset: | |
7c657876 ACM |
846 | dccp_v4_ctl_send_reset(skb); |
847 | discard: | |
848 | kfree_skb(skb); | |
849 | return 0; | |
850 | } | |
851 | ||
f21e68ca ACM |
852 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
853 | ||
854 | int dccp_invalid_packet(struct sk_buff *skb) | |
7c657876 ACM |
855 | { |
856 | const struct dccp_hdr *dh; | |
857 | ||
858 | if (skb->pkt_type != PACKET_HOST) | |
859 | return 1; | |
860 | ||
861 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { | |
c59eab46 | 862 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); |
7c657876 ACM |
863 | return 1; |
864 | } | |
865 | ||
866 | dh = dccp_hdr(skb); | |
867 | ||
868 | /* If the packet type is not understood, drop packet and return */ | |
869 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
c59eab46 | 870 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); |
7c657876 ACM |
871 | return 1; |
872 | } | |
873 | ||
874 | /* | |
875 | * If P.Data Offset is too small for packet type, or too large for | |
876 | * packet, drop packet and return | |
877 | */ | |
878 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
c59eab46 ACM |
879 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
880 | "too small 1\n", | |
881 | dh->dccph_doff); | |
7c657876 ACM |
882 | return 1; |
883 | } | |
884 | ||
885 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { | |
c59eab46 ACM |
886 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
887 | "too small 2\n", | |
888 | dh->dccph_doff); | |
7c657876 ACM |
889 | return 1; |
890 | } | |
891 | ||
892 | dh = dccp_hdr(skb); | |
893 | ||
894 | /* | |
895 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
896 | * has short sequence numbers), drop packet and return | |
897 | */ | |
898 | if (dh->dccph_x == 0 && | |
899 | dh->dccph_type != DCCP_PKT_DATA && | |
900 | dh->dccph_type != DCCP_PKT_ACK && | |
901 | dh->dccph_type != DCCP_PKT_DATAACK) { | |
c59eab46 ACM |
902 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack " |
903 | "nor DataAck and P.X == 0\n", | |
904 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
905 | return 1; |
906 | } | |
907 | ||
7c657876 ACM |
908 | return 0; |
909 | } | |
910 | ||
f21e68ca ACM |
911 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
912 | ||
7c657876 ACM |
913 | /* this is called when real data arrives */ |
914 | int dccp_v4_rcv(struct sk_buff *skb) | |
915 | { | |
916 | const struct dccp_hdr *dh; | |
917 | struct sock *sk; | |
7c657876 ACM |
918 | |
919 | /* Step 1: Check header basics: */ | |
920 | ||
921 | if (dccp_invalid_packet(skb)) | |
922 | goto discard_it; | |
923 | ||
f21e68ca ACM |
924 | /* If the header checksum is incorrect, drop packet and return */ |
925 | if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr, | |
926 | skb->nh.iph->daddr) < 0) { | |
927 | LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n", | |
928 | __FUNCTION__); | |
929 | goto discard_it; | |
930 | } | |
931 | ||
7c657876 | 932 | dh = dccp_hdr(skb); |
7c657876 | 933 | |
7c657876 ACM |
934 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
935 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
936 | ||
937 | dccp_pr_debug("%8.8s " | |
938 | "src=%u.%u.%u.%u@%-5d " | |
939 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
940 | dccp_packet_name(dh->dccph_type), | |
941 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
942 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 943 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
944 | |
945 | if (dccp_packet_without_ack(skb)) { | |
946 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
947 | dccp_pr_debug_cat("\n"); | |
948 | } else { | |
949 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
f6ccf554 DM |
950 | dccp_pr_debug_cat(", ack=%llu\n", |
951 | (unsigned long long) | |
952 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
7c657876 ACM |
953 | } |
954 | ||
955 | /* Step 2: | |
956 | * Look up flow ID in table and get corresponding socket */ | |
957 | sk = __inet_lookup(&dccp_hashinfo, | |
958 | skb->nh.iph->saddr, dh->dccph_sport, | |
959 | skb->nh.iph->daddr, ntohs(dh->dccph_dport), | |
960 | inet_iif(skb)); | |
961 | ||
962 | /* | |
963 | * Step 2: | |
964 | * If no socket ... | |
965 | * Generate Reset(No Connection) unless P.type == Reset | |
966 | * Drop packet and return | |
967 | */ | |
968 | if (sk == NULL) { | |
969 | dccp_pr_debug("failed to look up flow ID in table and " | |
970 | "get corresponding socket\n"); | |
971 | goto no_dccp_socket; | |
972 | } | |
973 | ||
974 | /* | |
975 | * Step 2: | |
976 | * ... or S.state == TIMEWAIT, | |
977 | * Generate Reset(No Connection) unless P.type == Reset | |
978 | * Drop packet and return | |
979 | */ | |
980 | ||
981 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
64cf1e5d ACM |
982 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: " |
983 | "do_time_wait\n"); | |
984 | goto do_time_wait; | |
7c657876 ACM |
985 | } |
986 | ||
25995ff5 | 987 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 988 | goto discard_and_relse; |
eb9c7ebe | 989 | nf_reset(skb); |
7c657876 | 990 | |
25995ff5 | 991 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
992 | |
993 | no_dccp_socket: | |
994 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
995 | goto discard_it; | |
996 | /* | |
997 | * Step 2: | |
998 | * Generate Reset(No Connection) unless P.type == Reset | |
999 | * Drop packet and return | |
1000 | */ | |
1001 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
1002 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
1003 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
1004 | dccp_v4_ctl_send_reset(skb); |
1005 | } | |
1006 | ||
1007 | discard_it: | |
1008 | /* Discard frame. */ | |
1009 | kfree_skb(skb); | |
1010 | return 0; | |
1011 | ||
1012 | discard_and_relse: | |
1013 | sock_put(sk); | |
1014 | goto discard_it; | |
64cf1e5d ACM |
1015 | |
1016 | do_time_wait: | |
1017 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
1018 | goto no_dccp_socket; | |
7c657876 ACM |
1019 | } |
1020 | ||
57cca05a ACM |
1021 | struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
1022 | .queue_xmit = ip_queue_xmit, | |
1023 | .send_check = dccp_v4_send_check, | |
1024 | .rebuild_header = inet_sk_rebuild_header, | |
1025 | .conn_request = dccp_v4_conn_request, | |
1026 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
1027 | .net_header_len = sizeof(struct iphdr), | |
1028 | .setsockopt = ip_setsockopt, | |
1029 | .getsockopt = ip_getsockopt, | |
1030 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1031 | .sockaddr_len = sizeof(struct sockaddr_in), | |
1032 | }; | |
1033 | ||
f21e68ca | 1034 | int dccp_v4_init_sock(struct sock *sk) |
7c657876 ACM |
1035 | { |
1036 | struct dccp_sock *dp = dccp_sk(sk); | |
d83d8461 | 1037 | struct inet_connection_sock *icsk = inet_csk(sk); |
7c657876 ACM |
1038 | static int dccp_ctl_socket_init = 1; |
1039 | ||
1040 | dccp_options_init(&dp->dccps_options); | |
b0e56780 | 1041 | do_gettimeofday(&dp->dccps_epoch); |
7c657876 ACM |
1042 | |
1043 | if (dp->dccps_options.dccpo_send_ack_vector) { | |
ae31c339 ACM |
1044 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(DCCP_MAX_ACKVEC_LEN, |
1045 | GFP_KERNEL); | |
1046 | if (dp->dccps_hc_rx_ackvec == NULL) | |
7c657876 ACM |
1047 | return -ENOMEM; |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * FIXME: We're hardcoding the CCID, and doing this at this point makes | |
1052 | * the listening (master) sock get CCID control blocks, which is not | |
1053 | * necessary, but for now, to not mess with the test userspace apps, | |
1054 | * lets leave it here, later the real solution is to do this in a | |
1055 | * setsockopt(CCIDs-I-want/accept). -acme | |
1056 | */ | |
1057 | if (likely(!dccp_ctl_socket_init)) { | |
561713cf | 1058 | dp->dccps_hc_rx_ccid = ccid_init(dp->dccps_options.dccpo_rx_ccid, |
7690af3f | 1059 | sk); |
561713cf | 1060 | dp->dccps_hc_tx_ccid = ccid_init(dp->dccps_options.dccpo_tx_ccid, |
7690af3f | 1061 | sk); |
7c657876 ACM |
1062 | if (dp->dccps_hc_rx_ccid == NULL || |
1063 | dp->dccps_hc_tx_ccid == NULL) { | |
1064 | ccid_exit(dp->dccps_hc_rx_ccid, sk); | |
1065 | ccid_exit(dp->dccps_hc_tx_ccid, sk); | |
ae31c339 ACM |
1066 | if (dp->dccps_options.dccpo_send_ack_vector) { |
1067 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
1068 | dp->dccps_hc_rx_ackvec = NULL; | |
1069 | } | |
7c657876 ACM |
1070 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
1071 | return -ENOMEM; | |
1072 | } | |
1073 | } else | |
1074 | dccp_ctl_socket_init = 0; | |
1075 | ||
1076 | dccp_init_xmit_timers(sk); | |
d83d8461 | 1077 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
7c657876 | 1078 | sk->sk_state = DCCP_CLOSED; |
c530cfb1 | 1079 | sk->sk_write_space = dccp_write_space; |
d83d8461 ACM |
1080 | icsk->icsk_af_ops = &dccp_ipv4_af_ops; |
1081 | icsk->icsk_sync_mss = dccp_sync_mss; | |
7c657876 ACM |
1082 | dp->dccps_mss_cache = 536; |
1083 | dp->dccps_role = DCCP_ROLE_UNDEFINED; | |
67e6b629 | 1084 | dp->dccps_service = DCCP_SERVICE_INVALID_VALUE; |
7c657876 ACM |
1085 | |
1086 | return 0; | |
1087 | } | |
1088 | ||
f21e68ca ACM |
1089 | EXPORT_SYMBOL_GPL(dccp_v4_init_sock); |
1090 | ||
1091 | int dccp_v4_destroy_sock(struct sock *sk) | |
7c657876 ACM |
1092 | { |
1093 | struct dccp_sock *dp = dccp_sk(sk); | |
1094 | ||
1095 | /* | |
4c7e6895 | 1096 | * DCCP doesn't use sk_write_queue, just sk_send_head |
7c657876 ACM |
1097 | * for retransmissions |
1098 | */ | |
1099 | if (sk->sk_send_head != NULL) { | |
1100 | kfree_skb(sk->sk_send_head); | |
1101 | sk->sk_send_head = NULL; | |
1102 | } | |
1103 | ||
1104 | /* Clean up a referenced DCCP bind bucket. */ | |
1105 | if (inet_csk(sk)->icsk_bind_hash != NULL) | |
1106 | inet_put_port(&dccp_hashinfo, sk); | |
1107 | ||
a51482bd JJ |
1108 | kfree(dp->dccps_service_list); |
1109 | dp->dccps_service_list = NULL; | |
67e6b629 | 1110 | |
8efa544f ACM |
1111 | ccid_hc_rx_exit(dp->dccps_hc_rx_ccid, sk); |
1112 | ccid_hc_tx_exit(dp->dccps_hc_tx_ccid, sk); | |
ae31c339 ACM |
1113 | if (dp->dccps_options.dccpo_send_ack_vector) { |
1114 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); | |
1115 | dp->dccps_hc_rx_ackvec = NULL; | |
1116 | } | |
7c657876 ACM |
1117 | ccid_exit(dp->dccps_hc_rx_ccid, sk); |
1118 | ccid_exit(dp->dccps_hc_tx_ccid, sk); | |
1119 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
f21e68ca ACM |
1124 | EXPORT_SYMBOL_GPL(dccp_v4_destroy_sock); |
1125 | ||
7c657876 ACM |
1126 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
1127 | { | |
1128 | kfree(inet_rsk(req)->opt); | |
1129 | } | |
1130 | ||
1131 | static struct request_sock_ops dccp_request_sock_ops = { | |
1132 | .family = PF_INET, | |
1133 | .obj_size = sizeof(struct dccp_request_sock), | |
1134 | .rtx_syn_ack = dccp_v4_send_response, | |
1135 | .send_ack = dccp_v4_reqsk_send_ack, | |
1136 | .destructor = dccp_v4_reqsk_destructor, | |
1137 | .send_reset = dccp_v4_ctl_send_reset, | |
1138 | }; | |
1139 | ||
6d6ee43e ACM |
1140 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
1141 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
1142 | }; | |
1143 | ||
34ca6860 | 1144 | struct proto dccp_prot = { |
7c657876 ACM |
1145 | .name = "DCCP", |
1146 | .owner = THIS_MODULE, | |
1147 | .close = dccp_close, | |
1148 | .connect = dccp_v4_connect, | |
1149 | .disconnect = dccp_disconnect, | |
1150 | .ioctl = dccp_ioctl, | |
1151 | .init = dccp_v4_init_sock, | |
1152 | .setsockopt = dccp_setsockopt, | |
1153 | .getsockopt = dccp_getsockopt, | |
1154 | .sendmsg = dccp_sendmsg, | |
1155 | .recvmsg = dccp_recvmsg, | |
1156 | .backlog_rcv = dccp_v4_do_rcv, | |
1157 | .hash = dccp_v4_hash, | |
f21e68ca | 1158 | .unhash = dccp_unhash, |
7c657876 ACM |
1159 | .accept = inet_csk_accept, |
1160 | .get_port = dccp_v4_get_port, | |
1161 | .shutdown = dccp_shutdown, | |
1162 | .destroy = dccp_v4_destroy_sock, | |
1163 | .orphan_count = &dccp_orphan_count, | |
1164 | .max_header = MAX_DCCP_HEADER, | |
1165 | .obj_size = sizeof(struct dccp_sock), | |
1166 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 1167 | .twsk_prot = &dccp_timewait_sock_ops, |
7c657876 | 1168 | }; |
6d6ee43e ACM |
1169 | |
1170 | EXPORT_SYMBOL_GPL(dccp_prot); |