]>
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; | |
bada8adc | 53 | __be32 daddr, nexthop; |
7c657876 ACM |
54 | int tmp; |
55 | int err; | |
56 | ||
57 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
58 | ||
59 | if (addr_len < sizeof(struct sockaddr_in)) | |
60 | return -EINVAL; | |
61 | ||
62 | if (usin->sin_family != AF_INET) | |
63 | return -EAFNOSUPPORT; | |
64 | ||
65 | nexthop = daddr = usin->sin_addr.s_addr; | |
66 | if (inet->opt != NULL && inet->opt->srr) { | |
67 | if (daddr == 0) | |
68 | return -EINVAL; | |
69 | nexthop = inet->opt->faddr; | |
70 | } | |
71 | ||
72 | tmp = ip_route_connect(&rt, nexthop, inet->saddr, | |
73 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, | |
74 | IPPROTO_DCCP, | |
75 | inet->sport, usin->sin_port, sk); | |
76 | if (tmp < 0) | |
77 | return tmp; | |
78 | ||
79 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
80 | ip_rt_put(rt); | |
81 | return -ENETUNREACH; | |
82 | } | |
83 | ||
84 | if (inet->opt == NULL || !inet->opt->srr) | |
85 | daddr = rt->rt_dst; | |
86 | ||
87 | if (inet->saddr == 0) | |
88 | inet->saddr = rt->rt_src; | |
89 | inet->rcv_saddr = inet->saddr; | |
90 | ||
91 | inet->dport = usin->sin_port; | |
92 | inet->daddr = daddr; | |
93 | ||
d83d8461 | 94 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 95 | if (inet->opt != NULL) |
d83d8461 | 96 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
97 | /* |
98 | * Socket identity is still unknown (sport may be zero). | |
99 | * However we set state to DCCP_REQUESTING and not releasing socket | |
100 | * lock select source port, enter ourselves into the hash tables and | |
101 | * complete initialization after this. | |
102 | */ | |
103 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 104 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
105 | if (err != 0) |
106 | goto failure; | |
107 | ||
5d39a795 PM |
108 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->sport, inet->dport, |
109 | sk); | |
7c657876 ACM |
110 | if (err != 0) |
111 | goto failure; | |
112 | ||
113 | /* OK, now commit destination to socket. */ | |
114 | sk_setup_caps(sk, &rt->u.dst); | |
115 | ||
116 | dp->dccps_gar = | |
117 | dp->dccps_iss = secure_dccp_sequence_number(inet->saddr, | |
118 | inet->daddr, | |
119 | inet->sport, | |
120 | usin->sin_port); | |
121 | dccp_update_gss(sk, dp->dccps_iss); | |
122 | ||
123 | inet->id = dp->dccps_iss ^ jiffies; | |
124 | ||
125 | err = dccp_connect(sk); | |
126 | rt = NULL; | |
127 | if (err != 0) | |
128 | goto failure; | |
129 | out: | |
130 | return err; | |
131 | failure: | |
7690af3f ACM |
132 | /* |
133 | * This unhashes the socket and releases the local port, if necessary. | |
134 | */ | |
7c657876 ACM |
135 | dccp_set_state(sk, DCCP_CLOSED); |
136 | ip_rt_put(rt); | |
137 | sk->sk_route_caps = 0; | |
138 | inet->dport = 0; | |
139 | goto out; | |
140 | } | |
141 | ||
f21e68ca ACM |
142 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
143 | ||
7c657876 ACM |
144 | /* |
145 | * This routine does path mtu discovery as defined in RFC1191. | |
146 | */ | |
147 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
148 | const struct iphdr *iph, | |
149 | u32 mtu) | |
150 | { | |
151 | struct dst_entry *dst; | |
152 | const struct inet_sock *inet = inet_sk(sk); | |
153 | const struct dccp_sock *dp = dccp_sk(sk); | |
154 | ||
155 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
156 | * send out by Linux are always < 576bytes so they should go through | |
157 | * unfragmented). | |
158 | */ | |
159 | if (sk->sk_state == DCCP_LISTEN) | |
160 | return; | |
161 | ||
162 | /* We don't check in the destentry if pmtu discovery is forbidden | |
163 | * on this route. We just assume that no packet_to_big packets | |
164 | * are send back when pmtu discovery is not active. | |
165 | * There is a small race when the user changes this flag in the | |
166 | * route, but I think that's acceptable. | |
167 | */ | |
168 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
169 | return; | |
170 | ||
171 | dst->ops->update_pmtu(dst, mtu); | |
172 | ||
173 | /* Something is about to be wrong... Remember soft error | |
174 | * for the case, if this connection will not able to recover. | |
175 | */ | |
176 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
177 | sk->sk_err_soft = EMSGSIZE; | |
178 | ||
179 | mtu = dst_mtu(dst); | |
180 | ||
181 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 182 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
183 | dccp_sync_mss(sk, mtu); |
184 | ||
185 | /* | |
0e64e94e | 186 | * From RFC 4340, sec. 14.1: |
7c657876 | 187 | * |
7690af3f ACM |
188 | * DCCP-Sync packets are the best choice for upward |
189 | * probing, since DCCP-Sync probes do not risk application | |
190 | * data loss. | |
7c657876 | 191 | */ |
e92ae93a | 192 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
193 | } /* else let the usual retransmit timer handle it */ |
194 | } | |
195 | ||
7c657876 ACM |
196 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
197 | struct dst_entry *dst) | |
198 | { | |
199 | int err = -1; | |
200 | struct sk_buff *skb; | |
201 | ||
202 | /* First, grab a route. */ | |
203 | ||
204 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
205 | goto out; | |
206 | ||
207 | skb = dccp_make_response(sk, dst, req); | |
208 | if (skb != NULL) { | |
209 | const struct inet_request_sock *ireq = inet_rsk(req); | |
0a1ec676 | 210 | struct dccp_hdr *dh = dccp_hdr(skb); |
7c657876 | 211 | |
0a1ec676 ACM |
212 | dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, |
213 | ireq->rmt_addr); | |
49c5bfaf | 214 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
7c657876 ACM |
215 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
216 | ireq->rmt_addr, | |
217 | ireq->opt); | |
218 | if (err == NET_XMIT_CN) | |
219 | err = 0; | |
220 | } | |
221 | ||
222 | out: | |
223 | dst_release(dst); | |
224 | return err; | |
225 | } | |
226 | ||
227 | /* | |
228 | * This routine is called by the ICMP module when it gets some sort of error | |
229 | * condition. If err < 0 then the socket should be closed and the error | |
230 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
231 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
232 | * need to find the appropriate port. | |
233 | * | |
234 | * The locking strategy used here is very "optimistic". When someone else | |
235 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
236 | * check at all. A more general error queue to queue errors for later handling | |
237 | * is probably better. | |
238 | */ | |
b61fafc4 | 239 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
240 | { |
241 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
242 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
243 | (iph->ihl << 2)); | |
7c657876 ACM |
244 | struct dccp_sock *dp; |
245 | struct inet_sock *inet; | |
246 | const int type = skb->h.icmph->type; | |
247 | const int code = skb->h.icmph->code; | |
248 | struct sock *sk; | |
249 | __u64 seq; | |
250 | int err; | |
251 | ||
252 | if (skb->len < (iph->ihl << 2) + 8) { | |
253 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
254 | return; | |
255 | } | |
256 | ||
257 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
258 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
259 | if (sk == NULL) { | |
260 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
261 | return; | |
262 | } | |
263 | ||
264 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 265 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
266 | return; |
267 | } | |
268 | ||
269 | bh_lock_sock(sk); | |
270 | /* If too many ICMPs get dropped on busy | |
271 | * servers this needs to be solved differently. | |
272 | */ | |
273 | if (sock_owned_by_user(sk)) | |
274 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
275 | ||
276 | if (sk->sk_state == DCCP_CLOSED) | |
277 | goto out; | |
278 | ||
279 | dp = dccp_sk(sk); | |
280 | seq = dccp_hdr_seq(skb); | |
281 | if (sk->sk_state != DCCP_LISTEN && | |
282 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
283 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
284 | goto out; | |
285 | } | |
286 | ||
287 | switch (type) { | |
288 | case ICMP_SOURCE_QUENCH: | |
289 | /* Just silently ignore these. */ | |
290 | goto out; | |
291 | case ICMP_PARAMETERPROB: | |
292 | err = EPROTO; | |
293 | break; | |
294 | case ICMP_DEST_UNREACH: | |
295 | if (code > NR_ICMP_UNREACH) | |
296 | goto out; | |
297 | ||
298 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
299 | if (!sock_owned_by_user(sk)) | |
300 | dccp_do_pmtu_discovery(sk, iph, info); | |
301 | goto out; | |
302 | } | |
303 | ||
304 | err = icmp_err_convert[code].errno; | |
305 | break; | |
306 | case ICMP_TIME_EXCEEDED: | |
307 | err = EHOSTUNREACH; | |
308 | break; | |
309 | default: | |
310 | goto out; | |
311 | } | |
312 | ||
313 | switch (sk->sk_state) { | |
314 | struct request_sock *req , **prev; | |
315 | case DCCP_LISTEN: | |
316 | if (sock_owned_by_user(sk)) | |
317 | goto out; | |
318 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
319 | iph->daddr, iph->saddr); | |
320 | if (!req) | |
321 | goto out; | |
322 | ||
323 | /* | |
324 | * ICMPs are not backlogged, hence we cannot get an established | |
325 | * socket here. | |
326 | */ | |
327 | BUG_TRAP(!req->sk); | |
328 | ||
329 | if (seq != dccp_rsk(req)->dreq_iss) { | |
330 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
331 | goto out; | |
332 | } | |
333 | /* | |
334 | * Still in RESPOND, just remove it silently. | |
335 | * There is no good way to pass the error to the newly | |
336 | * created socket, and POSIX does not want network | |
337 | * errors returned from accept(). | |
338 | */ | |
339 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
340 | goto out; | |
341 | ||
342 | case DCCP_REQUESTING: | |
343 | case DCCP_RESPOND: | |
344 | if (!sock_owned_by_user(sk)) { | |
345 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
346 | sk->sk_err = err; | |
347 | ||
348 | sk->sk_error_report(sk); | |
349 | ||
350 | dccp_done(sk); | |
351 | } else | |
352 | sk->sk_err_soft = err; | |
353 | goto out; | |
354 | } | |
355 | ||
356 | /* If we've already connected we will keep trying | |
357 | * until we time out, or the user gives up. | |
358 | * | |
359 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
360 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
361 | * but it is obsoleted by pmtu discovery). | |
362 | * | |
363 | * Note, that in modern internet, where routing is unreliable | |
364 | * and in each dark corner broken firewalls sit, sending random | |
365 | * errors ordered by their masters even this two messages finally lose | |
366 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
367 | * | |
368 | * Now we are in compliance with RFCs. | |
369 | * --ANK (980905) | |
370 | */ | |
371 | ||
372 | inet = inet_sk(sk); | |
373 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
374 | sk->sk_err = err; | |
375 | sk->sk_error_report(sk); | |
376 | } else /* Only an error on timeout */ | |
377 | sk->sk_err_soft = err; | |
378 | out: | |
379 | bh_unlock_sock(sk); | |
380 | sock_put(sk); | |
381 | } | |
382 | ||
57cca05a | 383 | /* This routine computes an IPv4 DCCP checksum. */ |
f21e68ca | 384 | void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
57cca05a ACM |
385 | { |
386 | const struct inet_sock *inet = inet_sk(sk); | |
387 | struct dccp_hdr *dh = dccp_hdr(skb); | |
388 | ||
389 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr); | |
390 | } | |
391 | ||
f21e68ca ACM |
392 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
393 | ||
7c657876 ACM |
394 | static inline u64 dccp_v4_init_sequence(const struct sock *sk, |
395 | const struct sk_buff *skb) | |
396 | { | |
397 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
398 | skb->nh.iph->saddr, | |
399 | dccp_hdr(skb)->dccph_dport, | |
400 | dccp_hdr(skb)->dccph_sport); | |
401 | } | |
402 | ||
82709531 GR |
403 | static struct request_sock_ops dccp_request_sock_ops; |
404 | ||
7c657876 ACM |
405 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
406 | { | |
407 | struct inet_request_sock *ireq; | |
408 | struct dccp_sock dp; | |
409 | struct request_sock *req; | |
410 | struct dccp_request_sock *dreq; | |
60fe62e7 AB |
411 | const __be32 saddr = skb->nh.iph->saddr; |
412 | const __be32 daddr = skb->nh.iph->daddr; | |
413 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; | |
0c10c5d9 ACM |
414 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
415 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
7c657876 ACM |
416 | |
417 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
418 | if (((struct rtable *)skb->dst)->rt_flags & | |
0c10c5d9 ACM |
419 | (RTCF_BROADCAST | RTCF_MULTICAST)) { |
420 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 | 421 | goto drop; |
0c10c5d9 | 422 | } |
7c657876 | 423 | |
67e6b629 ACM |
424 | if (dccp_bad_service_code(sk, service)) { |
425 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
426 | goto drop; | |
427 | } | |
7c657876 ACM |
428 | /* |
429 | * TW buckets are converted to open requests without | |
430 | * limitations, they conserve resources and peer is | |
431 | * evidently real one. | |
432 | */ | |
433 | if (inet_csk_reqsk_queue_is_full(sk)) | |
434 | goto drop; | |
435 | ||
436 | /* | |
437 | * Accept backlog is full. If we have already queued enough | |
438 | * of warm entries in syn queue, drop request. It is better than | |
439 | * clogging syn queue with openreqs with exponentially increasing | |
440 | * timeout. | |
441 | */ | |
442 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
443 | goto drop; | |
444 | ||
82709531 | 445 | req = reqsk_alloc(&dccp_request_sock_ops); |
7c657876 ACM |
446 | if (req == NULL) |
447 | goto drop; | |
448 | ||
afe00251 | 449 | if (dccp_parse_options(sk, skb)) |
b8282dcf | 450 | goto drop_and_free; |
7c657876 ACM |
451 | |
452 | dccp_openreq_init(req, &dp, skb); | |
453 | ||
4237c75c VY |
454 | if (security_inet_conn_request(sk, skb, req)) |
455 | goto drop_and_free; | |
456 | ||
7c657876 ACM |
457 | ireq = inet_rsk(req); |
458 | ireq->loc_addr = daddr; | |
459 | ireq->rmt_addr = saddr; | |
4b79f0af | 460 | req->rcv_wnd = dccp_feat_default_sequence_window; |
7c657876 ACM |
461 | ireq->opt = NULL; |
462 | ||
463 | /* | |
464 | * Step 3: Process LISTEN state | |
465 | * | |
466 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
467 | * | |
468 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
469 | * dccp_create_openreq_child. | |
470 | */ | |
471 | dreq = dccp_rsk(req); | |
67e6b629 ACM |
472 | dreq->dreq_isr = dcb->dccpd_seq; |
473 | dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); | |
474 | dreq->dreq_service = service; | |
7c657876 | 475 | |
f21e68ca | 476 | if (dccp_v4_send_response(sk, req, NULL)) |
7c657876 ACM |
477 | goto drop_and_free; |
478 | ||
479 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
480 | return 0; | |
481 | ||
482 | drop_and_free: | |
fc44b980 | 483 | reqsk_free(req); |
7c657876 ACM |
484 | drop: |
485 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
0c10c5d9 | 486 | dcb->dccpd_reset_code = reset_code; |
7c657876 ACM |
487 | return -1; |
488 | } | |
489 | ||
f21e68ca ACM |
490 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); |
491 | ||
7c657876 ACM |
492 | /* |
493 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
494 | * now create the new socket. | |
495 | * | |
496 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
497 | */ | |
498 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
499 | struct request_sock *req, | |
500 | struct dst_entry *dst) | |
501 | { | |
502 | struct inet_request_sock *ireq; | |
503 | struct inet_sock *newinet; | |
504 | struct dccp_sock *newdp; | |
505 | struct sock *newsk; | |
506 | ||
507 | if (sk_acceptq_is_full(sk)) | |
508 | goto exit_overflow; | |
509 | ||
510 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
511 | goto exit; | |
512 | ||
513 | newsk = dccp_create_openreq_child(sk, req, skb); | |
514 | if (newsk == NULL) | |
515 | goto exit; | |
516 | ||
517 | sk_setup_caps(newsk, dst); | |
518 | ||
519 | newdp = dccp_sk(newsk); | |
520 | newinet = inet_sk(newsk); | |
521 | ireq = inet_rsk(req); | |
522 | newinet->daddr = ireq->rmt_addr; | |
523 | newinet->rcv_saddr = ireq->loc_addr; | |
524 | newinet->saddr = ireq->loc_addr; | |
525 | newinet->opt = ireq->opt; | |
526 | ireq->opt = NULL; | |
527 | newinet->mc_index = inet_iif(skb); | |
528 | newinet->mc_ttl = skb->nh.iph->ttl; | |
529 | newinet->id = jiffies; | |
530 | ||
531 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
532 | ||
533 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
534 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
535 | ||
536 | return newsk; | |
537 | ||
538 | exit_overflow: | |
539 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
540 | exit: | |
541 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
542 | dst_release(dst); | |
543 | return NULL; | |
544 | } | |
545 | ||
f21e68ca ACM |
546 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
547 | ||
7c657876 ACM |
548 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
549 | { | |
550 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
551 | const struct iphdr *iph = skb->nh.iph; | |
552 | struct sock *nsk; | |
553 | struct request_sock **prev; | |
554 | /* Find possible connection requests. */ | |
555 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
556 | dh->dccph_sport, | |
557 | iph->saddr, iph->daddr); | |
558 | if (req != NULL) | |
559 | return dccp_check_req(sk, skb, req, prev); | |
560 | ||
8f491069 HX |
561 | nsk = inet_lookup_established(&dccp_hashinfo, |
562 | iph->saddr, dh->dccph_sport, | |
563 | iph->daddr, dh->dccph_dport, | |
564 | inet_iif(skb)); | |
7c657876 ACM |
565 | if (nsk != NULL) { |
566 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
567 | bh_lock_sock(nsk); | |
568 | return nsk; | |
569 | } | |
9469c7b4 | 570 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
571 | return NULL; |
572 | } | |
573 | ||
574 | return sk; | |
575 | } | |
576 | ||
60fe62e7 AB |
577 | int dccp_v4_checksum(const struct sk_buff *skb, const __be32 saddr, |
578 | const __be32 daddr) | |
7c657876 | 579 | { |
95b81ef7 | 580 | const struct dccp_hdr* dh = dccp_hdr(skb); |
7c657876 ACM |
581 | int checksum_len; |
582 | u32 tmp; | |
583 | ||
584 | if (dh->dccph_cscov == 0) | |
585 | checksum_len = skb->len; | |
586 | else { | |
587 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
588 | checksum_len = checksum_len < skb->len ? checksum_len : |
589 | skb->len; | |
7c657876 ACM |
590 | } |
591 | ||
592 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
593 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
594 | IPPROTO_DCCP, tmp); | |
7c657876 ACM |
595 | } |
596 | ||
b61fafc4 ACM |
597 | EXPORT_SYMBOL_GPL(dccp_v4_checksum); |
598 | ||
95b81ef7 | 599 | static int dccp_v4_verify_checksum(struct sk_buff *skb, |
60fe62e7 | 600 | const __be32 saddr, const __be32 daddr) |
7c657876 | 601 | { |
95b81ef7 YN |
602 | struct dccp_hdr *dh = dccp_hdr(skb); |
603 | int checksum_len; | |
604 | u32 tmp; | |
7c657876 | 605 | |
95b81ef7 YN |
606 | if (dh->dccph_cscov == 0) |
607 | checksum_len = skb->len; | |
608 | else { | |
609 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
610 | checksum_len = checksum_len < skb->len ? checksum_len : |
611 | skb->len; | |
95b81ef7 YN |
612 | } |
613 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
614 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
615 | IPPROTO_DCCP, tmp) == 0 ? 0 : -1; | |
7c657876 ACM |
616 | } |
617 | ||
618 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, | |
619 | struct sk_buff *skb) | |
620 | { | |
621 | struct rtable *rt; | |
622 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
623 | .nl_u = { .ip4_u = | |
624 | { .daddr = skb->nh.iph->saddr, | |
625 | .saddr = skb->nh.iph->daddr, | |
626 | .tos = RT_CONN_FLAGS(sk) } }, | |
627 | .proto = sk->sk_protocol, | |
628 | .uli_u = { .ports = | |
629 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
630 | .dport = dccp_hdr(skb)->dccph_sport } |
631 | } | |
632 | }; | |
7c657876 | 633 | |
beb8d13b | 634 | security_skb_classify_flow(skb, &fl); |
7c657876 ACM |
635 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { |
636 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
637 | return NULL; | |
638 | } | |
639 | ||
640 | return &rt->u.dst; | |
641 | } | |
642 | ||
a1d3a355 | 643 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
644 | { |
645 | int err; | |
646 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
647 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
648 | sizeof(struct dccp_hdr_ext) + | |
649 | sizeof(struct dccp_hdr_reset); | |
650 | struct sk_buff *skb; | |
651 | struct dst_entry *dst; | |
2807d4ff | 652 | u64 seqno; |
7c657876 ACM |
653 | |
654 | /* Never send a reset in response to a reset. */ | |
655 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
656 | return; | |
657 | ||
658 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
659 | return; | |
660 | ||
72478873 | 661 | dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb); |
7c657876 ACM |
662 | if (dst == NULL) |
663 | return; | |
664 | ||
118b2c95 ACM |
665 | skb = alloc_skb(dccp_v4_ctl_socket->sk->sk_prot->max_header, |
666 | GFP_ATOMIC); | |
7c657876 ACM |
667 | if (skb == NULL) |
668 | goto out; | |
669 | ||
670 | /* Reserve space for headers. */ | |
118b2c95 | 671 | skb_reserve(skb, dccp_v4_ctl_socket->sk->sk_prot->max_header); |
7c657876 ACM |
672 | skb->dst = dst_clone(dst); |
673 | ||
9b42078e | 674 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
7c657876 ACM |
675 | |
676 | /* Build DCCP header and checksum it. */ | |
677 | dh->dccph_type = DCCP_PKT_RESET; | |
678 | dh->dccph_sport = rxdh->dccph_dport; | |
679 | dh->dccph_dport = rxdh->dccph_sport; | |
680 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
681 | dh->dccph_x = 1; | |
7690af3f ACM |
682 | dccp_hdr_reset(skb)->dccph_reset_code = |
683 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 684 | |
0e64e94e | 685 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
2807d4ff ACM |
686 | seqno = 0; |
687 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
688 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
689 | ||
690 | dccp_hdr_set_seq(dh, seqno); | |
7690af3f ACM |
691 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
692 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 693 | |
95b81ef7 YN |
694 | dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr, |
695 | rxskb->nh.iph->daddr); | |
7c657876 | 696 | |
72478873 ACM |
697 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
698 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
7690af3f ACM |
699 | rxskb->nh.iph->daddr, |
700 | rxskb->nh.iph->saddr, NULL); | |
72478873 | 701 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 ACM |
702 | |
703 | if (err == NET_XMIT_CN || err == 0) { | |
704 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
705 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
706 | } | |
707 | out: | |
708 | dst_release(dst); | |
709 | } | |
710 | ||
711 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
712 | { | |
713 | struct dccp_hdr *dh = dccp_hdr(skb); | |
714 | ||
715 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
716 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
717 | goto reset; | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Step 3: Process LISTEN state | |
723 | * If S.state == LISTEN, | |
7690af3f ACM |
724 | * If P.type == Request or P contains a valid Init Cookie |
725 | * option, | |
7c657876 ACM |
726 | * * Must scan the packet's options to check for an Init |
727 | * Cookie. Only the Init Cookie is processed here, | |
728 | * however; other options are processed in Step 8. This | |
729 | * scan need only be performed if the endpoint uses Init | |
730 | * Cookies * | |
731 | * * Generate a new socket and switch to that socket * | |
732 | * Set S := new socket for this port pair | |
733 | * S.state = RESPOND | |
734 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
735 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
736 | * Continue with S.state == RESPOND | |
737 | * * A Response packet will be generated in Step 11 * | |
738 | * Otherwise, | |
739 | * Generate Reset(No Connection) unless P.type == Reset | |
740 | * Drop packet and return | |
741 | * | |
7690af3f ACM |
742 | * NOTE: the check for the packet types is done in |
743 | * dccp_rcv_state_process | |
7c657876 ACM |
744 | */ |
745 | if (sk->sk_state == DCCP_LISTEN) { | |
746 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
747 | ||
748 | if (nsk == NULL) | |
749 | goto discard; | |
750 | ||
751 | if (nsk != sk) { | |
752 | if (dccp_child_process(sk, nsk, skb)) | |
753 | goto reset; | |
754 | return 0; | |
755 | } | |
756 | } | |
757 | ||
758 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
759 | goto reset; | |
760 | return 0; | |
761 | ||
762 | reset: | |
7c657876 ACM |
763 | dccp_v4_ctl_send_reset(skb); |
764 | discard: | |
765 | kfree_skb(skb); | |
766 | return 0; | |
767 | } | |
768 | ||
f21e68ca ACM |
769 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
770 | ||
771 | int dccp_invalid_packet(struct sk_buff *skb) | |
7c657876 ACM |
772 | { |
773 | const struct dccp_hdr *dh; | |
774 | ||
775 | if (skb->pkt_type != PACKET_HOST) | |
776 | return 1; | |
777 | ||
778 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { | |
c59eab46 | 779 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); |
7c657876 ACM |
780 | return 1; |
781 | } | |
782 | ||
783 | dh = dccp_hdr(skb); | |
784 | ||
785 | /* If the packet type is not understood, drop packet and return */ | |
786 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
c59eab46 | 787 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); |
7c657876 ACM |
788 | return 1; |
789 | } | |
790 | ||
791 | /* | |
792 | * If P.Data Offset is too small for packet type, or too large for | |
793 | * packet, drop packet and return | |
794 | */ | |
795 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
c59eab46 ACM |
796 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
797 | "too small 1\n", | |
798 | dh->dccph_doff); | |
7c657876 ACM |
799 | return 1; |
800 | } | |
801 | ||
802 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { | |
c59eab46 ACM |
803 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
804 | "too small 2\n", | |
805 | dh->dccph_doff); | |
7c657876 ACM |
806 | return 1; |
807 | } | |
808 | ||
809 | dh = dccp_hdr(skb); | |
810 | ||
811 | /* | |
812 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
813 | * has short sequence numbers), drop packet and return | |
814 | */ | |
815 | if (dh->dccph_x == 0 && | |
816 | dh->dccph_type != DCCP_PKT_DATA && | |
817 | dh->dccph_type != DCCP_PKT_ACK && | |
818 | dh->dccph_type != DCCP_PKT_DATAACK) { | |
c59eab46 ACM |
819 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack " |
820 | "nor DataAck and P.X == 0\n", | |
821 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
822 | return 1; |
823 | } | |
824 | ||
7c657876 ACM |
825 | return 0; |
826 | } | |
827 | ||
f21e68ca ACM |
828 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
829 | ||
7c657876 | 830 | /* this is called when real data arrives */ |
b61fafc4 | 831 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
832 | { |
833 | const struct dccp_hdr *dh; | |
834 | struct sock *sk; | |
7c657876 ACM |
835 | |
836 | /* Step 1: Check header basics: */ | |
837 | ||
838 | if (dccp_invalid_packet(skb)) | |
839 | goto discard_it; | |
840 | ||
f21e68ca ACM |
841 | /* If the header checksum is incorrect, drop packet and return */ |
842 | if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr, | |
843 | skb->nh.iph->daddr) < 0) { | |
844 | LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n", | |
845 | __FUNCTION__); | |
846 | goto discard_it; | |
847 | } | |
848 | ||
7c657876 | 849 | dh = dccp_hdr(skb); |
7c657876 | 850 | |
7c657876 ACM |
851 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
852 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
853 | ||
854 | dccp_pr_debug("%8.8s " | |
855 | "src=%u.%u.%u.%u@%-5d " | |
856 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
857 | dccp_packet_name(dh->dccph_type), | |
858 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
859 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 860 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
861 | |
862 | if (dccp_packet_without_ack(skb)) { | |
863 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
864 | dccp_pr_debug_cat("\n"); | |
865 | } else { | |
866 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 867 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 868 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
869 | } |
870 | ||
871 | /* Step 2: | |
872 | * Look up flow ID in table and get corresponding socket */ | |
873 | sk = __inet_lookup(&dccp_hashinfo, | |
874 | skb->nh.iph->saddr, dh->dccph_sport, | |
8f491069 | 875 | skb->nh.iph->daddr, dh->dccph_dport, |
7c657876 ACM |
876 | inet_iif(skb)); |
877 | ||
878 | /* | |
879 | * Step 2: | |
880 | * If no socket ... | |
881 | * Generate Reset(No Connection) unless P.type == Reset | |
882 | * Drop packet and return | |
883 | */ | |
884 | if (sk == NULL) { | |
885 | dccp_pr_debug("failed to look up flow ID in table and " | |
886 | "get corresponding socket\n"); | |
887 | goto no_dccp_socket; | |
888 | } | |
889 | ||
890 | /* | |
891 | * Step 2: | |
892 | * ... or S.state == TIMEWAIT, | |
893 | * Generate Reset(No Connection) unless P.type == Reset | |
894 | * Drop packet and return | |
895 | */ | |
7c657876 | 896 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
897 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
898 | inet_twsk_put(inet_twsk(sk)); | |
899 | goto no_dccp_socket; | |
7c657876 ACM |
900 | } |
901 | ||
25995ff5 | 902 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 903 | goto discard_and_relse; |
eb9c7ebe | 904 | nf_reset(skb); |
7c657876 | 905 | |
25995ff5 | 906 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
907 | |
908 | no_dccp_socket: | |
909 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
910 | goto discard_it; | |
911 | /* | |
912 | * Step 2: | |
913 | * Generate Reset(No Connection) unless P.type == Reset | |
914 | * Drop packet and return | |
915 | */ | |
916 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
917 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
918 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
919 | dccp_v4_ctl_send_reset(skb); |
920 | } | |
921 | ||
922 | discard_it: | |
7c657876 ACM |
923 | kfree_skb(skb); |
924 | return 0; | |
925 | ||
926 | discard_and_relse: | |
927 | sock_put(sk); | |
928 | goto discard_it; | |
929 | } | |
930 | ||
b61fafc4 | 931 | static struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
932 | .queue_xmit = ip_queue_xmit, |
933 | .send_check = dccp_v4_send_check, | |
934 | .rebuild_header = inet_sk_rebuild_header, | |
935 | .conn_request = dccp_v4_conn_request, | |
936 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
937 | .net_header_len = sizeof(struct iphdr), | |
938 | .setsockopt = ip_setsockopt, | |
939 | .getsockopt = ip_getsockopt, | |
940 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
941 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 942 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
943 | .compat_setsockopt = compat_ip_setsockopt, |
944 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 945 | #endif |
57cca05a ACM |
946 | }; |
947 | ||
3e0fadc5 | 948 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 949 | { |
72478873 ACM |
950 | static __u8 dccp_v4_ctl_sock_initialized; |
951 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 952 | |
72478873 ACM |
953 | if (err == 0) { |
954 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
955 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 956 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
957 | } |
958 | ||
3e0fadc5 | 959 | return err; |
7c657876 ACM |
960 | } |
961 | ||
962 | static void dccp_v4_reqsk_destructor(struct request_sock *req) | |
963 | { | |
964 | kfree(inet_rsk(req)->opt); | |
965 | } | |
966 | ||
494b4e7d | 967 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { |
7c657876 ACM |
968 | .family = PF_INET, |
969 | .obj_size = sizeof(struct dccp_request_sock), | |
970 | .rtx_syn_ack = dccp_v4_send_response, | |
8a73cd09 | 971 | .send_ack = dccp_reqsk_send_ack, |
7c657876 ACM |
972 | .destructor = dccp_v4_reqsk_destructor, |
973 | .send_reset = dccp_v4_ctl_send_reset, | |
974 | }; | |
975 | ||
6d6ee43e ACM |
976 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
977 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
978 | }; | |
979 | ||
5e0817f8 | 980 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
981 | .name = "DCCP", |
982 | .owner = THIS_MODULE, | |
983 | .close = dccp_close, | |
984 | .connect = dccp_v4_connect, | |
985 | .disconnect = dccp_disconnect, | |
986 | .ioctl = dccp_ioctl, | |
987 | .init = dccp_v4_init_sock, | |
988 | .setsockopt = dccp_setsockopt, | |
989 | .getsockopt = dccp_getsockopt, | |
990 | .sendmsg = dccp_sendmsg, | |
991 | .recvmsg = dccp_recvmsg, | |
992 | .backlog_rcv = dccp_v4_do_rcv, | |
c985ed70 | 993 | .hash = dccp_hash, |
f21e68ca | 994 | .unhash = dccp_unhash, |
7c657876 ACM |
995 | .accept = inet_csk_accept, |
996 | .get_port = dccp_v4_get_port, | |
997 | .shutdown = dccp_shutdown, | |
3e0fadc5 | 998 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
999 | .orphan_count = &dccp_orphan_count, |
1000 | .max_header = MAX_DCCP_HEADER, | |
1001 | .obj_size = sizeof(struct dccp_sock), | |
1002 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 1003 | .twsk_prot = &dccp_timewait_sock_ops, |
543d9cfe ACM |
1004 | #ifdef CONFIG_COMPAT |
1005 | .compat_setsockopt = compat_dccp_setsockopt, | |
1006 | .compat_getsockopt = compat_dccp_getsockopt, | |
1007 | #endif | |
7c657876 | 1008 | }; |
6d6ee43e | 1009 | |
b61fafc4 ACM |
1010 | static struct net_protocol dccp_v4_protocol = { |
1011 | .handler = dccp_v4_rcv, | |
1012 | .err_handler = dccp_v4_err, | |
1013 | .no_policy = 1, | |
1014 | }; | |
1015 | ||
1016 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
1017 | .family = PF_INET, |
1018 | .owner = THIS_MODULE, | |
1019 | .release = inet_release, | |
1020 | .bind = inet_bind, | |
1021 | .connect = inet_stream_connect, | |
1022 | .socketpair = sock_no_socketpair, | |
1023 | .accept = inet_accept, | |
1024 | .getname = inet_getname, | |
b61fafc4 | 1025 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1026 | .poll = dccp_poll, |
1027 | .ioctl = inet_ioctl, | |
b61fafc4 | 1028 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1029 | .listen = inet_dccp_listen, |
1030 | .shutdown = inet_shutdown, | |
1031 | .setsockopt = sock_common_setsockopt, | |
1032 | .getsockopt = sock_common_getsockopt, | |
1033 | .sendmsg = inet_sendmsg, | |
1034 | .recvmsg = sock_common_recvmsg, | |
1035 | .mmap = sock_no_mmap, | |
1036 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1037 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1038 | .compat_setsockopt = compat_sock_common_setsockopt, |
1039 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1040 | #endif |
b61fafc4 ACM |
1041 | }; |
1042 | ||
1043 | static struct inet_protosw dccp_v4_protosw = { | |
1044 | .type = SOCK_DCCP, | |
1045 | .protocol = IPPROTO_DCCP, | |
1046 | .prot = &dccp_v4_prot, | |
1047 | .ops = &inet_dccp_ops, | |
1048 | .capability = -1, | |
1049 | .no_check = 0, | |
1050 | .flags = INET_PROTOSW_ICSK, | |
1051 | }; | |
1052 | ||
b61fafc4 ACM |
1053 | static int __init dccp_v4_init(void) |
1054 | { | |
1055 | int err = proto_register(&dccp_v4_prot, 1); | |
1056 | ||
1057 | if (err != 0) | |
1058 | goto out; | |
1059 | ||
1060 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1061 | if (err != 0) | |
1062 | goto out_proto_unregister; | |
1063 | ||
1064 | inet_register_protosw(&dccp_v4_protosw); | |
1065 | ||
c4d93909 ACM |
1066 | err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET, |
1067 | SOCK_DCCP, IPPROTO_DCCP); | |
b61fafc4 ACM |
1068 | if (err) |
1069 | goto out_unregister_protosw; | |
1070 | out: | |
1071 | return err; | |
1072 | out_unregister_protosw: | |
1073 | inet_unregister_protosw(&dccp_v4_protosw); | |
1074 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1075 | out_proto_unregister: | |
1076 | proto_unregister(&dccp_v4_prot); | |
1077 | goto out; | |
1078 | } | |
1079 | ||
1080 | static void __exit dccp_v4_exit(void) | |
1081 | { | |
1082 | inet_unregister_protosw(&dccp_v4_protosw); | |
1083 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1084 | proto_unregister(&dccp_v4_prot); | |
1085 | } | |
1086 | ||
1087 | module_init(dccp_v4_init); | |
1088 | module_exit(dccp_v4_exit); | |
1089 | ||
1090 | /* | |
1091 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1092 | * values directly, Also cover the case where the protocol is not specified, | |
1093 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1094 | */ | |
1095 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
1096 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
1097 | MODULE_LICENSE("GPL"); | |
1098 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1099 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |