Commit | Line | Data |
---|---|---|
7c657876 ACM |
1 | /* |
2 | * net/dccp/ipv4.c | |
3 | * | |
4 | * An implementation of the DCCP protocol | |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
7c657876 ACM |
13 | #include <linux/dccp.h> |
14 | #include <linux/icmp.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/random.h> | |
18 | ||
19 | #include <net/icmp.h> | |
b61fafc4 | 20 | #include <net/inet_common.h> |
7c657876 | 21 | #include <net/inet_hashtables.h> |
14c85021 | 22 | #include <net/inet_sock.h> |
b61fafc4 | 23 | #include <net/protocol.h> |
7c657876 | 24 | #include <net/sock.h> |
6d6ee43e | 25 | #include <net/timewait_sock.h> |
7c657876 ACM |
26 | #include <net/tcp_states.h> |
27 | #include <net/xfrm.h> | |
28 | ||
ae31c339 | 29 | #include "ackvec.h" |
7c657876 ACM |
30 | #include "ccid.h" |
31 | #include "dccp.h" | |
afe00251 | 32 | #include "feat.h" |
7c657876 | 33 | |
72478873 ACM |
34 | /* |
35 | * This is the global socket data structure used for responding to | |
36 | * the Out-of-the-blue (OOTB) packets. A control sock will be created | |
37 | * for this socket at the initialization time. | |
38 | */ | |
39 | static struct socket *dccp_v4_ctl_socket; | |
40 | ||
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; | |
53 | u32 daddr, nexthop; | |
54 | int tmp; | |
55 | int err; | |
56 | ||
57 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
58 | ||
67e6b629 ACM |
59 | if (dccp_service_not_initialized(sk)) |
60 | return -EPROTO; | |
61 | ||
7c657876 ACM |
62 | if (addr_len < sizeof(struct sockaddr_in)) |
63 | return -EINVAL; | |
64 | ||
65 | if (usin->sin_family != AF_INET) | |
66 | return -EAFNOSUPPORT; | |
67 | ||
68 | nexthop = daddr = usin->sin_addr.s_addr; | |
69 | if (inet->opt != NULL && inet->opt->srr) { | |
70 | if (daddr == 0) | |
71 | return -EINVAL; | |
72 | nexthop = inet->opt->faddr; | |
73 | } | |
74 | ||
75 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
76 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
77 | IPPROTO_DCCP, | |
78 | inet->sport, usin->sin_port, sk); | |
79 | if (tmp < 0) | |
80 | return tmp; | |
81 | ||
82 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
83 | ip_rt_put(rt); | |
84 | return -ENETUNREACH; | |
85 | } | |
86 | ||
87 | if (inet->opt == NULL || !inet->opt->srr) | |
88 | daddr = rt->rt_dst; | |
89 | ||
90 | if (inet->saddr == 0) | |
91 | inet->saddr = rt->rt_src; | |
92 | inet->rcv_saddr = inet->saddr; | |
93 | ||
94 | inet->dport = usin->sin_port; | |
95 | inet->daddr = daddr; | |
96 | ||
d83d8461 | 97 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 98 | if (inet->opt != NULL) |
d83d8461 | 99 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
100 | /* |
101 | * Socket identity is still unknown (sport may be zero). | |
102 | * However we set state to DCCP_REQUESTING and not releasing socket | |
103 | * lock select source port, enter ourselves into the hash tables and | |
104 | * complete initialization after this. | |
105 | */ | |
106 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 107 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
108 | if (err != 0) |
109 | goto failure; | |
110 | ||
5d39a795 PM |
111 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport, |
112 | sk); | |
7c657876 ACM |
113 | if (err != 0) |
114 | goto failure; | |
115 | ||
116 | /* OK, now commit destination to socket. */ | |
117 | sk_setup_caps(sk, &rt->u.dst); | |
118 | ||
119 | dp->dccps_gar = | |
120 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, | |
121 | inet->daddr, | |
122 | inet->sport, | |
123 | usin->sin_port); | |
124 | dccp_update_gss(sk, dp->dccps_iss); | |
125 | ||
126 | inet->id = dp->dccps_iss ^ jiffies; | |
127 | ||
128 | err = dccp_connect(sk); | |
129 | rt = NULL; | |
130 | if (err != 0) | |
131 | goto failure; | |
132 | out: | |
133 | return err; | |
134 | failure: | |
7690af3f ACM |
135 | /* |
136 | * This unhashes the socket and releases the local port, if necessary. | |
137 | */ | |
7c657876 ACM |
138 | dccp_set_state(sk, DCCP_CLOSED); |
139 | ip_rt_put(rt); | |
140 | sk->sk_route_caps = 0; | |
141 | inet->dport = 0; | |
142 | goto out; | |
143 | } | |
144 | ||
f21e68ca ACM |
145 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
146 | ||
7c657876 ACM |
147 | /* |
148 | * This routine does path mtu discovery as defined in RFC1191. | |
149 | */ | |
150 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
151 | const struct iphdr *iph, | |
152 | u32 mtu) | |
153 | { | |
154 | struct dst_entry *dst; | |
155 | const struct inet_sock *inet = inet_sk(sk); | |
156 | const struct dccp_sock *dp = dccp_sk(sk); | |
157 | ||
158 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
159 | * send out by Linux are always < 576bytes so they should go through | |
160 | * unfragmented). | |
161 | */ | |
162 | if (sk->sk_state == DCCP_LISTEN) | |
163 | return; | |
164 | ||
165 | /* We don't check in the destentry if pmtu discovery is forbidden | |
166 | * on this route. We just assume that no packet_to_big packets | |
167 | * are send back when pmtu discovery is not active. | |
168 | * There is a small race when the user changes this flag in the | |
169 | * route, but I think that's acceptable. | |
170 | */ | |
171 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
172 | return; | |
173 | ||
174 | dst->ops->update_pmtu(dst, mtu); | |
175 | ||
176 | /* Something is about to be wrong... Remember soft error | |
177 | * for the case, if this connection will not able to recover. | |
178 | */ | |
179 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
180 | sk->sk_err_soft = EMSGSIZE; | |
181 | ||
182 | mtu = dst_mtu(dst); | |
183 | ||
184 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 185 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
186 | dccp_sync_mss(sk, mtu); |
187 | ||
188 | /* | |
189 | * From: draft-ietf-dccp-spec-11.txt | |
190 | * | |
7690af3f ACM |
191 | * DCCP-Sync packets are the best choice for upward |
192 | * probing, since DCCP-Sync probes do not risk application | |
193 | * data loss. | |
7c657876 | 194 | */ |
e92ae93a | 195 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
196 | } /* else let the usual retransmit timer handle it */ |
197 | } | |
198 | ||
c5fed159 ACM |
199 | static void dccp_v4_reqsk_send_ack(struct sk_buff *rxskb, |
200 | struct request_sock *req) | |
7c657876 ACM |
201 | { |
202 | int err; | |
203 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
118b2c95 | 204 | const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) + |
7c657876 ACM |
205 | sizeof(struct dccp_hdr_ext) + |
206 | sizeof(struct dccp_hdr_ack_bits); | |
207 | struct sk_buff *skb; | |
208 | ||
209 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
210 | return; | |
211 | ||
118b2c95 | 212 | skb = alloc_skb(dccp_v4_ctl_socket->sk->sk_prot->max_header, GFP_ATOMIC); |
7c657876 ACM |
213 | if (skb == NULL) |
214 | return; | |
215 | ||
216 | /* Reserve space for headers. */ | |
118b2c95 | 217 | skb_reserve(skb, dccp_v4_ctl_socket->sk->sk_prot->max_header); |
7c657876 ACM |
218 | |
219 | skb->dst = dst_clone(rxskb->dst); | |
220 | ||
221 | skb->h.raw = skb_push(skb, dccp_hdr_ack_len); | |
222 | dh = dccp_hdr(skb); | |
223 | memset(dh, 0, dccp_hdr_ack_len); | |
224 | ||
225 | /* Build DCCP header and checksum it. */ | |
226 | dh->dccph_type = DCCP_PKT_ACK; | |
227 | dh->dccph_sport = rxdh->dccph_dport; | |
228 | dh->dccph_dport = rxdh->dccph_sport; | |
229 | dh->dccph_doff = dccp_hdr_ack_len / 4; | |
230 | dh->dccph_x = 1; | |
231 | ||
232 | dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq); | |
7690af3f ACM |
233 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
234 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 235 | |
72478873 ACM |
236 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
237 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
7690af3f ACM |
238 | rxskb->nh.iph->daddr, |
239 | rxskb->nh.iph->saddr, NULL); | |
72478873 | 240 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 ACM |
241 | |
242 | if (err == NET_XMIT_CN || err == 0) { | |
243 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
244 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
245 | } | |
246 | } | |
247 | ||
7c657876 ACM |
248 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
249 | struct dst_entry *dst) | |
250 | { | |
251 | int err = -1; | |
252 | struct sk_buff *skb; | |
253 | ||
254 | /* First, grab a route. */ | |
255 | ||
256 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
257 | goto out; | |
258 | ||
259 | skb = dccp_make_response(sk, dst, req); | |
260 | if (skb != NULL) { | |
261 | const struct inet_request_sock *ireq = inet_rsk(req); | |
0a1ec676 | 262 | struct dccp_hdr *dh = dccp_hdr(skb); |
7c657876 | 263 | |
0a1ec676 ACM |
264 | dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, |
265 | ireq->rmt_addr); | |
49c5bfaf | 266 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
7c657876 ACM |
267 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
268 | ireq->rmt_addr, | |
269 | ireq->opt); | |
270 | if (err == NET_XMIT_CN) | |
271 | err = 0; | |
272 | } | |
273 | ||
274 | out: | |
275 | dst_release(dst); | |
276 | return err; | |
277 | } | |
278 | ||
279 | /* | |
280 | * This routine is called by the ICMP module when it gets some sort of error | |
281 | * condition. If err < 0 then the socket should be closed and the error | |
282 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
283 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
284 | * need to find the appropriate port. | |
285 | * | |
286 | * The locking strategy used here is very "optimistic". When someone else | |
287 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
288 | * check at all. A more general error queue to queue errors for later handling | |
289 | * is probably better. | |
290 | */ | |
b61fafc4 | 291 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
292 | { |
293 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
294 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
295 | (iph->ihl << 2)); | |
7c657876 ACM |
296 | struct dccp_sock *dp; |
297 | struct inet_sock *inet; | |
298 | const int type = skb->h.icmph->type; | |
299 | const int code = skb->h.icmph->code; | |
300 | struct sock *sk; | |
301 | __u64 seq; | |
302 | int err; | |
303 | ||
304 | if (skb->len < (iph->ihl << 2) + 8) { | |
305 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
306 | return; | |
307 | } | |
308 | ||
309 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
310 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
311 | if (sk == NULL) { | |
312 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
313 | return; | |
314 | } | |
315 | ||
316 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
317 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
318 | return; | |
319 | } | |
320 | ||
321 | bh_lock_sock(sk); | |
322 | /* If too many ICMPs get dropped on busy | |
323 | * servers this needs to be solved differently. | |
324 | */ | |
325 | if (sock_owned_by_user(sk)) | |
326 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
327 | ||
328 | if (sk->sk_state == DCCP_CLOSED) | |
329 | goto out; | |
330 | ||
331 | dp = dccp_sk(sk); | |
332 | seq = dccp_hdr_seq(skb); | |
333 | if (sk->sk_state != DCCP_LISTEN && | |
334 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
335 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
336 | goto out; | |
337 | } | |
338 | ||
339 | switch (type) { | |
340 | case ICMP_SOURCE_QUENCH: | |
341 | /* Just silently ignore these. */ | |
342 | goto out; | |
343 | case ICMP_PARAMETERPROB: | |
344 | err = EPROTO; | |
345 | break; | |
346 | case ICMP_DEST_UNREACH: | |
347 | if (code > NR_ICMP_UNREACH) | |
348 | goto out; | |
349 | ||
350 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
351 | if (!sock_owned_by_user(sk)) | |
352 | dccp_do_pmtu_discovery(sk, iph, info); | |
353 | goto out; | |
354 | } | |
355 | ||
356 | err = icmp_err_convert[code].errno; | |
357 | break; | |
358 | case ICMP_TIME_EXCEEDED: | |
359 | err = EHOSTUNREACH; | |
360 | break; | |
361 | default: | |
362 | goto out; | |
363 | } | |
364 | ||
365 | switch (sk->sk_state) { | |
366 | struct request_sock *req , **prev; | |
367 | case DCCP_LISTEN: | |
368 | if (sock_owned_by_user(sk)) | |
369 | goto out; | |
370 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
371 | iph->daddr, iph->saddr); | |
372 | if (!req) | |
373 | goto out; | |
374 | ||
375 | /* | |
376 | * ICMPs are not backlogged, hence we cannot get an established | |
377 | * socket here. | |
378 | */ | |
379 | BUG_TRAP(!req->sk); | |
380 | ||
381 | if (seq != dccp_rsk(req)->dreq_iss) { | |
382 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
383 | goto out; | |
384 | } | |
385 | /* | |
386 | * Still in RESPOND, just remove it silently. | |
387 | * There is no good way to pass the error to the newly | |
388 | * created socket, and POSIX does not want network | |
389 | * errors returned from accept(). | |
390 | */ | |
391 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
392 | goto out; | |
393 | ||
394 | case DCCP_REQUESTING: | |
395 | case DCCP_RESPOND: | |
396 | if (!sock_owned_by_user(sk)) { | |
397 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
398 | sk->sk_err = err; | |
399 | ||
400 | sk->sk_error_report(sk); | |
401 | ||
402 | dccp_done(sk); | |
403 | } else | |
404 | sk->sk_err_soft = err; | |
405 | goto out; | |
406 | } | |
407 | ||
408 | /* If we've already connected we will keep trying | |
409 | * until we time out, or the user gives up. | |
410 | * | |
411 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
412 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
413 | * but it is obsoleted by pmtu discovery). | |
414 | * | |
415 | * Note, that in modern internet, where routing is unreliable | |
416 | * and in each dark corner broken firewalls sit, sending random | |
417 | * errors ordered by their masters even this two messages finally lose | |
418 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
419 | * | |
420 | * Now we are in compliance with RFCs. | |
421 | * --ANK (980905) | |
422 | */ | |
423 | ||
424 | inet = inet_sk(sk); | |
425 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
426 | sk->sk_err = err; | |
427 | sk->sk_error_report(sk); | |
428 | } else /* Only an error on timeout */ | |
429 | sk->sk_err_soft = err; | |
430 | out: | |
431 | bh_unlock_sock(sk); | |
432 | sock_put(sk); | |
433 | } | |
434 | ||
57cca05a | 435 | /* This routine computes an IPv4 DCCP checksum. */ |
f21e68ca | 436 | void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
57cca05a ACM |
437 | { |
438 | const struct inet_sock *inet = inet_sk(sk); | |
439 | struct dccp_hdr *dh = dccp_hdr(skb); | |
440 | ||
441 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr); | |
442 | } | |
443 | ||
f21e68ca ACM |
444 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
445 | ||
7c657876 ACM |
446 | static inline u64 dccp_v4_init_sequence(const struct sock *sk, |
447 | const struct sk_buff *skb) | |
448 | { | |
449 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
450 | skb->nh.iph->saddr, | |
451 | dccp_hdr(skb)->dccph_dport, | |
452 | dccp_hdr(skb)->dccph_sport); | |
453 | } | |
454 | ||
455 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
456 | { | |
457 | struct inet_request_sock *ireq; | |
458 | struct dccp_sock dp; | |
459 | struct request_sock *req; | |
460 | struct dccp_request_sock *dreq; | |
60fe62e7 AB |
461 | const __be32 saddr = skb->nh.iph->saddr; |
462 | const __be32 daddr = skb->nh.iph->daddr; | |
463 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; | |
0c10c5d9 ACM |
464 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
465 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
7c657876 ACM |
466 | |
467 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
468 | if (((struct rtable *)skb->dst)->rt_flags & | |
0c10c5d9 ACM |
469 | (RTCF_BROADCAST | RTCF_MULTICAST)) { |
470 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 | 471 | goto drop; |
0c10c5d9 | 472 | } |
7c657876 | 473 | |
67e6b629 ACM |
474 | if (dccp_bad_service_code(sk, service)) { |
475 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
476 | goto drop; | |
477 | } | |
7c657876 ACM |
478 | /* |
479 | * TW buckets are converted to open requests without | |
480 | * limitations, they conserve resources and peer is | |
481 | * evidently real one. | |
482 | */ | |
483 | if (inet_csk_reqsk_queue_is_full(sk)) | |
484 | goto drop; | |
485 | ||
486 | /* | |
487 | * Accept backlog is full. If we have already queued enough | |
488 | * of warm entries in syn queue, drop request. It is better than | |
489 | * clogging syn queue with openreqs with exponentially increasing | |
490 | * timeout. | |
491 | */ | |
492 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
493 | goto drop; | |
494 | ||
495 | req = reqsk_alloc(sk->sk_prot->rsk_prot); | |
496 | if (req == NULL) | |
497 | goto drop; | |
498 | ||
afe00251 | 499 | if (dccp_parse_options(sk, skb)) |
b8282dcf | 500 | goto drop_and_free; |
7c657876 ACM |
501 | |
502 | dccp_openreq_init(req, &dp, skb); | |
503 | ||
504 | ireq = inet_rsk(req); | |
505 | ireq->loc_addr = daddr; | |
506 | ireq->rmt_addr = saddr; | |
4b79f0af | 507 | req->rcv_wnd = dccp_feat_default_sequence_window; |
7c657876 ACM |
508 | ireq->opt = NULL; |
509 | ||
510 | /* | |
511 | * Step 3: Process LISTEN state | |
512 | * | |
513 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
514 | * | |
515 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
516 | * dccp_create_openreq_child. | |
517 | */ | |
518 | dreq = dccp_rsk(req); | |
67e6b629 ACM |
519 | dreq->dreq_isr = dcb->dccpd_seq; |
520 | dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); | |
521 | dreq->dreq_service = service; | |
7c657876 | 522 | |
f21e68ca | 523 | if (dccp_v4_send_response(sk, req, NULL)) |
7c657876 ACM |
524 | goto drop_and_free; |
525 | ||
526 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
527 | return 0; | |
528 | ||
529 | drop_and_free: | |
fc44b980 | 530 | reqsk_free(req); |
7c657876 ACM |
531 | drop: |
532 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
0c10c5d9 | 533 | dcb->dccpd_reset_code = reset_code; |
7c657876 ACM |
534 | return -1; |
535 | } | |
536 | ||
f21e68ca ACM |
537 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); |
538 | ||
7c657876 ACM |
539 | /* |
540 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
541 | * now create the new socket. | |
542 | * | |
543 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
544 | */ | |
545 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
546 | struct request_sock *req, | |
547 | struct dst_entry *dst) | |
548 | { | |
549 | struct inet_request_sock *ireq; | |
550 | struct inet_sock *newinet; | |
551 | struct dccp_sock *newdp; | |
552 | struct sock *newsk; | |
553 | ||
554 | if (sk_acceptq_is_full(sk)) | |
555 | goto exit_overflow; | |
556 | ||
557 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
558 | goto exit; | |
559 | ||
560 | newsk = dccp_create_openreq_child(sk, req, skb); | |
561 | if (newsk == NULL) | |
562 | goto exit; | |
563 | ||
564 | sk_setup_caps(newsk, dst); | |
565 | ||
566 | newdp = dccp_sk(newsk); | |
567 | newinet = inet_sk(newsk); | |
568 | ireq = inet_rsk(req); | |
569 | newinet->daddr = ireq->rmt_addr; | |
570 | newinet->rcv_saddr = ireq->loc_addr; | |
571 | newinet->saddr = ireq->loc_addr; | |
572 | newinet->opt = ireq->opt; | |
573 | ireq->opt = NULL; | |
574 | newinet->mc_index = inet_iif(skb); | |
575 | newinet->mc_ttl = skb->nh.iph->ttl; | |
576 | newinet->id = jiffies; | |
577 | ||
578 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
579 | ||
580 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
581 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
582 | ||
583 | return newsk; | |
584 | ||
585 | exit_overflow: | |
586 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
587 | exit: | |
588 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
589 | dst_release(dst); | |
590 | return NULL; | |
591 | } | |
592 | ||
f21e68ca ACM |
593 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
594 | ||
7c657876 ACM |
595 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
596 | { | |
597 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
598 | const struct iphdr *iph = skb->nh.iph; | |
599 | struct sock *nsk; | |
600 | struct request_sock **prev; | |
601 | /* Find possible connection requests. */ | |
602 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
603 | dh->dccph_sport, | |
604 | iph->saddr, iph->daddr); | |
605 | if (req != NULL) | |
606 | return dccp_check_req(sk, skb, req, prev); | |
607 | ||
608 | nsk = __inet_lookup_established(&dccp_hashinfo, | |
609 | iph->saddr, dh->dccph_sport, | |
610 | iph->daddr, ntohs(dh->dccph_dport), | |
611 | inet_iif(skb)); | |
612 | if (nsk != NULL) { | |
613 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
614 | bh_lock_sock(nsk); | |
615 | return nsk; | |
616 | } | |
617 | inet_twsk_put((struct inet_timewait_sock *)nsk); | |
618 | return NULL; | |
619 | } | |
620 | ||
621 | return sk; | |
622 | } | |
623 | ||
60fe62e7 AB |
624 | int dccp_v4_checksum(const struct sk_buff *skb, const __be32 saddr, |
625 | const __be32 daddr) | |
7c657876 | 626 | { |
95b81ef7 | 627 | const struct dccp_hdr* dh = dccp_hdr(skb); |
7c657876 ACM |
628 | int checksum_len; |
629 | u32 tmp; | |
630 | ||
631 | if (dh->dccph_cscov == 0) | |
632 | checksum_len = skb->len; | |
633 | else { | |
634 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
635 | checksum_len = checksum_len < skb->len ? checksum_len : |
636 | skb->len; | |
7c657876 ACM |
637 | } |
638 | ||
639 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
640 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
641 | IPPROTO_DCCP, tmp); | |
7c657876 ACM |
642 | } |
643 | ||
b61fafc4 ACM |
644 | EXPORT_SYMBOL_GPL(dccp_v4_checksum); |
645 | ||
95b81ef7 | 646 | static int dccp_v4_verify_checksum(struct sk_buff *skb, |
60fe62e7 | 647 | const __be32 saddr, const __be32 daddr) |
7c657876 | 648 | { |
95b81ef7 YN |
649 | struct dccp_hdr *dh = dccp_hdr(skb); |
650 | int checksum_len; | |
651 | u32 tmp; | |
7c657876 | 652 | |
95b81ef7 YN |
653 | if (dh->dccph_cscov == 0) |
654 | checksum_len = skb->len; | |
655 | else { | |
656 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
657 | checksum_len = checksum_len < skb->len ? checksum_len : |
658 | skb->len; | |
95b81ef7 YN |
659 | } |
660 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
661 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
662 | IPPROTO_DCCP, tmp) == 0 ? 0 : -1; | |
7c657876 ACM |
663 | } |
664 | ||
665 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, | |
666 | struct sk_buff *skb) | |
667 | { | |
668 | struct rtable *rt; | |
669 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
670 | .nl_u = { .ip4_u = | |
671 | { .daddr = skb->nh.iph->saddr, | |
672 | .saddr = skb->nh.iph->daddr, | |
673 | .tos = RT_CONN_FLAGS(sk) } }, | |
674 | .proto = sk->sk_protocol, | |
675 | .uli_u = { .ports = | |
676 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
677 | .dport = dccp_hdr(skb)->dccph_sport } |
678 | } | |
679 | }; | |
7c657876 ACM |
680 | |
681 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { | |
682 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
683 | return NULL; | |
684 | } | |
685 | ||
686 | return &rt->u.dst; | |
687 | } | |
688 | ||
a1d3a355 | 689 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
690 | { |
691 | int err; | |
692 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
693 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
694 | sizeof(struct dccp_hdr_ext) + | |
695 | sizeof(struct dccp_hdr_reset); | |
696 | struct sk_buff *skb; | |
697 | struct dst_entry *dst; | |
2807d4ff | 698 | u64 seqno; |
7c657876 ACM |
699 | |
700 | /* Never send a reset in response to a reset. */ | |
701 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
702 | return; | |
703 | ||
704 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
705 | return; | |
706 | ||
72478873 | 707 | dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb); |
7c657876 ACM |
708 | if (dst == NULL) |
709 | return; | |
710 | ||
118b2c95 ACM |
711 | skb = alloc_skb(dccp_v4_ctl_socket->sk->sk_prot->max_header, |
712 | GFP_ATOMIC); | |
7c657876 ACM |
713 | if (skb == NULL) |
714 | goto out; | |
715 | ||
716 | /* Reserve space for headers. */ | |
118b2c95 | 717 | skb_reserve(skb, dccp_v4_ctl_socket->sk->sk_prot->max_header); |
7c657876 ACM |
718 | skb->dst = dst_clone(dst); |
719 | ||
720 | skb->h.raw = skb_push(skb, dccp_hdr_reset_len); | |
721 | dh = dccp_hdr(skb); | |
722 | memset(dh, 0, dccp_hdr_reset_len); | |
723 | ||
724 | /* Build DCCP header and checksum it. */ | |
725 | dh->dccph_type = DCCP_PKT_RESET; | |
726 | dh->dccph_sport = rxdh->dccph_dport; | |
727 | dh->dccph_dport = rxdh->dccph_sport; | |
728 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
729 | dh->dccph_x = 1; | |
7690af3f ACM |
730 | dccp_hdr_reset(skb)->dccph_reset_code = |
731 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 732 | |
2807d4ff ACM |
733 | /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */ |
734 | seqno = 0; | |
735 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
736 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
737 | ||
738 | dccp_hdr_set_seq(dh, seqno); | |
7690af3f ACM |
739 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
740 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 741 | |
95b81ef7 YN |
742 | dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr, |
743 | rxskb->nh.iph->daddr); | |
7c657876 | 744 | |
72478873 ACM |
745 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
746 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
7690af3f ACM |
747 | rxskb->nh.iph->daddr, |
748 | rxskb->nh.iph->saddr, NULL); | |
72478873 | 749 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 ACM |
750 | |
751 | if (err == NET_XMIT_CN || err == 0) { | |
752 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
753 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
754 | } | |
755 | out: | |
756 | dst_release(dst); | |
757 | } | |
758 | ||
759 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
760 | { | |
761 | struct dccp_hdr *dh = dccp_hdr(skb); | |
762 | ||
763 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
764 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
765 | goto reset; | |
766 | return 0; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Step 3: Process LISTEN state | |
771 | * If S.state == LISTEN, | |
7690af3f ACM |
772 | * If P.type == Request or P contains a valid Init Cookie |
773 | * option, | |
7c657876 ACM |
774 | * * Must scan the packet's options to check for an Init |
775 | * Cookie. Only the Init Cookie is processed here, | |
776 | * however; other options are processed in Step 8. This | |
777 | * scan need only be performed if the endpoint uses Init | |
778 | * Cookies * | |
779 | * * Generate a new socket and switch to that socket * | |
780 | * Set S := new socket for this port pair | |
781 | * S.state = RESPOND | |
782 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
783 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
784 | * Continue with S.state == RESPOND | |
785 | * * A Response packet will be generated in Step 11 * | |
786 | * Otherwise, | |
787 | * Generate Reset(No Connection) unless P.type == Reset | |
788 | * Drop packet and return | |
789 | * | |
7690af3f ACM |
790 | * NOTE: the check for the packet types is done in |
791 | * dccp_rcv_state_process | |
7c657876 ACM |
792 | */ |
793 | if (sk->sk_state == DCCP_LISTEN) { | |
794 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
795 | ||
796 | if (nsk == NULL) | |
797 | goto discard; | |
798 | ||
799 | if (nsk != sk) { | |
800 | if (dccp_child_process(sk, nsk, skb)) | |
801 | goto reset; | |
802 | return 0; | |
803 | } | |
804 | } | |
805 | ||
806 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
807 | goto reset; | |
808 | return 0; | |
809 | ||
810 | reset: | |
7c657876 ACM |
811 | dccp_v4_ctl_send_reset(skb); |
812 | discard: | |
813 | kfree_skb(skb); | |
814 | return 0; | |
815 | } | |
816 | ||
f21e68ca ACM |
817 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
818 | ||
819 | int dccp_invalid_packet(struct sk_buff *skb) | |
7c657876 ACM |
820 | { |
821 | const struct dccp_hdr *dh; | |
822 | ||
823 | if (skb->pkt_type != PACKET_HOST) | |
824 | return 1; | |
825 | ||
826 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { | |
c59eab46 | 827 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); |
7c657876 ACM |
828 | return 1; |
829 | } | |
830 | ||
831 | dh = dccp_hdr(skb); | |
832 | ||
833 | /* If the packet type is not understood, drop packet and return */ | |
834 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
c59eab46 | 835 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); |
7c657876 ACM |
836 | return 1; |
837 | } | |
838 | ||
839 | /* | |
840 | * If P.Data Offset is too small for packet type, or too large for | |
841 | * packet, drop packet and return | |
842 | */ | |
843 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
c59eab46 ACM |
844 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
845 | "too small 1\n", | |
846 | dh->dccph_doff); | |
7c657876 ACM |
847 | return 1; |
848 | } | |
849 | ||
850 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { | |
c59eab46 ACM |
851 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
852 | "too small 2\n", | |
853 | dh->dccph_doff); | |
7c657876 ACM |
854 | return 1; |
855 | } | |
856 | ||
857 | dh = dccp_hdr(skb); | |
858 | ||
859 | /* | |
860 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
861 | * has short sequence numbers), drop packet and return | |
862 | */ | |
863 | if (dh->dccph_x == 0 && | |
864 | dh->dccph_type != DCCP_PKT_DATA && | |
865 | dh->dccph_type != DCCP_PKT_ACK && | |
866 | dh->dccph_type != DCCP_PKT_DATAACK) { | |
c59eab46 ACM |
867 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack " |
868 | "nor DataAck and P.X == 0\n", | |
869 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
870 | return 1; |
871 | } | |
872 | ||
7c657876 ACM |
873 | return 0; |
874 | } | |
875 | ||
f21e68ca ACM |
876 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
877 | ||
7c657876 | 878 | /* this is called when real data arrives */ |
b61fafc4 | 879 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
880 | { |
881 | const struct dccp_hdr *dh; | |
882 | struct sock *sk; | |
7c657876 ACM |
883 | |
884 | /* Step 1: Check header basics: */ | |
885 | ||
886 | if (dccp_invalid_packet(skb)) | |
887 | goto discard_it; | |
888 | ||
f21e68ca ACM |
889 | /* If the header checksum is incorrect, drop packet and return */ |
890 | if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr, | |
891 | skb->nh.iph->daddr) < 0) { | |
892 | LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n", | |
893 | __FUNCTION__); | |
894 | goto discard_it; | |
895 | } | |
896 | ||
7c657876 | 897 | dh = dccp_hdr(skb); |
7c657876 | 898 | |
7c657876 ACM |
899 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
900 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
901 | ||
902 | dccp_pr_debug("%8.8s " | |
903 | "src=%u.%u.%u.%u@%-5d " | |
904 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
905 | dccp_packet_name(dh->dccph_type), | |
906 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
907 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 908 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
909 | |
910 | if (dccp_packet_without_ack(skb)) { | |
911 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
912 | dccp_pr_debug_cat("\n"); | |
913 | } else { | |
914 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
f6ccf554 DM |
915 | dccp_pr_debug_cat(", ack=%llu\n", |
916 | (unsigned long long) | |
917 | DCCP_SKB_CB(skb)->dccpd_ack_seq); | |
7c657876 ACM |
918 | } |
919 | ||
920 | /* Step 2: | |
921 | * Look up flow ID in table and get corresponding socket */ | |
922 | sk = __inet_lookup(&dccp_hashinfo, | |
923 | skb->nh.iph->saddr, dh->dccph_sport, | |
924 | skb->nh.iph->daddr, ntohs(dh->dccph_dport), | |
925 | inet_iif(skb)); | |
926 | ||
927 | /* | |
928 | * Step 2: | |
929 | * If no socket ... | |
930 | * Generate Reset(No Connection) unless P.type == Reset | |
931 | * Drop packet and return | |
932 | */ | |
933 | if (sk == NULL) { | |
934 | dccp_pr_debug("failed to look up flow ID in table and " | |
935 | "get corresponding socket\n"); | |
936 | goto no_dccp_socket; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Step 2: | |
941 | * ... or S.state == TIMEWAIT, | |
942 | * Generate Reset(No Connection) unless P.type == Reset | |
943 | * Drop packet and return | |
944 | */ | |
945 | ||
946 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
64cf1e5d ACM |
947 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: " |
948 | "do_time_wait\n"); | |
949 | goto do_time_wait; | |
7c657876 ACM |
950 | } |
951 | ||
25995ff5 | 952 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 953 | goto discard_and_relse; |
eb9c7ebe | 954 | nf_reset(skb); |
7c657876 | 955 | |
25995ff5 | 956 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
957 | |
958 | no_dccp_socket: | |
959 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
960 | goto discard_it; | |
961 | /* | |
962 | * Step 2: | |
963 | * Generate Reset(No Connection) unless P.type == Reset | |
964 | * Drop packet and return | |
965 | */ | |
966 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
967 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
968 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
969 | dccp_v4_ctl_send_reset(skb); |
970 | } | |
971 | ||
972 | discard_it: | |
973 | /* Discard frame. */ | |
974 | kfree_skb(skb); | |
975 | return 0; | |
976 | ||
977 | discard_and_relse: | |
978 | sock_put(sk); | |
979 | goto discard_it; | |
64cf1e5d ACM |
980 | |
981 | do_time_wait: | |
982 | inet_twsk_put((struct inet_timewait_sock *)sk); | |
983 | goto no_dccp_socket; | |
7c657876 ACM |
984 | } |
985 | ||
b61fafc4 | 986 | static struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
987 | .queue_xmit = ip_queue_xmit, |
988 | .send_check = dccp_v4_send_check, | |
989 | .rebuild_header = inet_sk_rebuild_header, | |
990 | .conn_request = dccp_v4_conn_request, | |
991 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
992 | .net_header_len = sizeof(struct iphdr), | |
993 | .setsockopt = ip_setsockopt, | |
994 | .getsockopt = ip_getsockopt, | |
995 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
996 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 997 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
998 | .compat_setsockopt = compat_ip_setsockopt, |
999 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1000 | #endif |
57cca05a ACM |
1001 | }; |
1002 | ||
3e0fadc5 | 1003 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 1004 | { |
72478873 ACM |
1005 | static __u8 dccp_v4_ctl_sock_initialized; |
1006 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 1007 | |
72478873 ACM |
1008 | if (err == 0) { |
1009 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
1010 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 1011 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
1012 | } |
1013 | ||
3e0fadc5 | 1014 | return err; |
7c657876 ACM |
1015 | } |
1016 | ||
1017 | static void dccp_v4_reqsk_destructor(struct request_sock *req) | |
1018 | { | |
1019 | kfree(inet_rsk(req)->opt); | |
1020 | } | |
1021 | ||
1022 | static struct request_sock_ops dccp_request_sock_ops = { | |
1023 | .family = PF_INET, | |
1024 | .obj_size = sizeof(struct dccp_request_sock), | |
1025 | .rtx_syn_ack = dccp_v4_send_response, | |
1026 | .send_ack = dccp_v4_reqsk_send_ack, | |
1027 | .destructor = dccp_v4_reqsk_destructor, | |
1028 | .send_reset = dccp_v4_ctl_send_reset, | |
1029 | }; | |
1030 | ||
6d6ee43e ACM |
1031 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
1032 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
1033 | }; | |
1034 | ||
5e0817f8 | 1035 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
1036 | .name = "DCCP", |
1037 | .owner = THIS_MODULE, | |
1038 | .close = dccp_close, | |
1039 | .connect = dccp_v4_connect, | |
1040 | .disconnect = dccp_disconnect, | |
1041 | .ioctl = dccp_ioctl, | |
1042 | .init = dccp_v4_init_sock, | |
1043 | .setsockopt = dccp_setsockopt, | |
1044 | .getsockopt = dccp_getsockopt, | |
1045 | .sendmsg = dccp_sendmsg, | |
1046 | .recvmsg = dccp_recvmsg, | |
1047 | .backlog_rcv = dccp_v4_do_rcv, | |
c985ed70 | 1048 | .hash = dccp_hash, |
f21e68ca | 1049 | .unhash = dccp_unhash, |
7c657876 ACM |
1050 | .accept = inet_csk_accept, |
1051 | .get_port = dccp_v4_get_port, | |
1052 | .shutdown = dccp_shutdown, | |
3e0fadc5 | 1053 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
1054 | .orphan_count = &dccp_orphan_count, |
1055 | .max_header = MAX_DCCP_HEADER, | |
1056 | .obj_size = sizeof(struct dccp_sock), | |
1057 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 1058 | .twsk_prot = &dccp_timewait_sock_ops, |
543d9cfe ACM |
1059 | #ifdef CONFIG_COMPAT |
1060 | .compat_setsockopt = compat_dccp_setsockopt, | |
1061 | .compat_getsockopt = compat_dccp_getsockopt, | |
1062 | #endif | |
7c657876 | 1063 | }; |
6d6ee43e | 1064 | |
b61fafc4 ACM |
1065 | static struct net_protocol dccp_v4_protocol = { |
1066 | .handler = dccp_v4_rcv, | |
1067 | .err_handler = dccp_v4_err, | |
1068 | .no_policy = 1, | |
1069 | }; | |
1070 | ||
1071 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
1072 | .family = PF_INET, |
1073 | .owner = THIS_MODULE, | |
1074 | .release = inet_release, | |
1075 | .bind = inet_bind, | |
1076 | .connect = inet_stream_connect, | |
1077 | .socketpair = sock_no_socketpair, | |
1078 | .accept = inet_accept, | |
1079 | .getname = inet_getname, | |
b61fafc4 | 1080 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1081 | .poll = dccp_poll, |
1082 | .ioctl = inet_ioctl, | |
b61fafc4 | 1083 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1084 | .listen = inet_dccp_listen, |
1085 | .shutdown = inet_shutdown, | |
1086 | .setsockopt = sock_common_setsockopt, | |
1087 | .getsockopt = sock_common_getsockopt, | |
1088 | .sendmsg = inet_sendmsg, | |
1089 | .recvmsg = sock_common_recvmsg, | |
1090 | .mmap = sock_no_mmap, | |
1091 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1092 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1093 | .compat_setsockopt = compat_sock_common_setsockopt, |
1094 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1095 | #endif |
b61fafc4 ACM |
1096 | }; |
1097 | ||
1098 | static struct inet_protosw dccp_v4_protosw = { | |
1099 | .type = SOCK_DCCP, | |
1100 | .protocol = IPPROTO_DCCP, | |
1101 | .prot = &dccp_v4_prot, | |
1102 | .ops = &inet_dccp_ops, | |
1103 | .capability = -1, | |
1104 | .no_check = 0, | |
1105 | .flags = INET_PROTOSW_ICSK, | |
1106 | }; | |
1107 | ||
b61fafc4 ACM |
1108 | static int __init dccp_v4_init(void) |
1109 | { | |
1110 | int err = proto_register(&dccp_v4_prot, 1); | |
1111 | ||
1112 | if (err != 0) | |
1113 | goto out; | |
1114 | ||
1115 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1116 | if (err != 0) | |
1117 | goto out_proto_unregister; | |
1118 | ||
1119 | inet_register_protosw(&dccp_v4_protosw); | |
1120 | ||
c4d93909 ACM |
1121 | err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET, |
1122 | SOCK_DCCP, IPPROTO_DCCP); | |
b61fafc4 ACM |
1123 | if (err) |
1124 | goto out_unregister_protosw; | |
1125 | out: | |
1126 | return err; | |
1127 | out_unregister_protosw: | |
1128 | inet_unregister_protosw(&dccp_v4_protosw); | |
1129 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1130 | out_proto_unregister: | |
1131 | proto_unregister(&dccp_v4_prot); | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | static void __exit dccp_v4_exit(void) | |
1136 | { | |
1137 | inet_unregister_protosw(&dccp_v4_protosw); | |
1138 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1139 | proto_unregister(&dccp_v4_prot); | |
1140 | } | |
1141 | ||
1142 | module_init(dccp_v4_init); | |
1143 | module_exit(dccp_v4_exit); | |
1144 | ||
1145 | /* | |
1146 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1147 | * values directly, Also cover the case where the protocol is not specified, | |
1148 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1149 | */ | |
1150 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
1151 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
1152 | MODULE_LICENSE("GPL"); | |
1153 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1154 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |