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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 | ||
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 | /* |
197 | * This routine is called by the ICMP module when it gets some sort of error | |
198 | * condition. If err < 0 then the socket should be closed and the error | |
199 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
200 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
201 | * need to find the appropriate port. | |
202 | * | |
203 | * The locking strategy used here is very "optimistic". When someone else | |
204 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
205 | * check at all. A more general error queue to queue errors for later handling | |
206 | * is probably better. | |
207 | */ | |
b61fafc4 | 208 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
209 | { |
210 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
7690af3f ACM |
211 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + |
212 | (iph->ihl << 2)); | |
7c657876 ACM |
213 | struct dccp_sock *dp; |
214 | struct inet_sock *inet; | |
215 | const int type = skb->h.icmph->type; | |
216 | const int code = skb->h.icmph->code; | |
217 | struct sock *sk; | |
218 | __u64 seq; | |
219 | int err; | |
220 | ||
221 | if (skb->len < (iph->ihl << 2) + 8) { | |
222 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
223 | return; | |
224 | } | |
225 | ||
226 | sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport, | |
227 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
228 | if (sk == NULL) { | |
229 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
230 | return; | |
231 | } | |
232 | ||
233 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 234 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
235 | return; |
236 | } | |
237 | ||
238 | bh_lock_sock(sk); | |
239 | /* If too many ICMPs get dropped on busy | |
240 | * servers this needs to be solved differently. | |
241 | */ | |
242 | if (sock_owned_by_user(sk)) | |
243 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); | |
244 | ||
245 | if (sk->sk_state == DCCP_CLOSED) | |
246 | goto out; | |
247 | ||
248 | dp = dccp_sk(sk); | |
249 | seq = dccp_hdr_seq(skb); | |
250 | if (sk->sk_state != DCCP_LISTEN && | |
251 | !between48(seq, dp->dccps_swl, dp->dccps_swh)) { | |
252 | NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS); | |
253 | goto out; | |
254 | } | |
255 | ||
256 | switch (type) { | |
257 | case ICMP_SOURCE_QUENCH: | |
258 | /* Just silently ignore these. */ | |
259 | goto out; | |
260 | case ICMP_PARAMETERPROB: | |
261 | err = EPROTO; | |
262 | break; | |
263 | case ICMP_DEST_UNREACH: | |
264 | if (code > NR_ICMP_UNREACH) | |
265 | goto out; | |
266 | ||
267 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
268 | if (!sock_owned_by_user(sk)) | |
269 | dccp_do_pmtu_discovery(sk, iph, info); | |
270 | goto out; | |
271 | } | |
272 | ||
273 | err = icmp_err_convert[code].errno; | |
274 | break; | |
275 | case ICMP_TIME_EXCEEDED: | |
276 | err = EHOSTUNREACH; | |
277 | break; | |
278 | default: | |
279 | goto out; | |
280 | } | |
281 | ||
282 | switch (sk->sk_state) { | |
283 | struct request_sock *req , **prev; | |
284 | case DCCP_LISTEN: | |
285 | if (sock_owned_by_user(sk)) | |
286 | goto out; | |
287 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
288 | iph->daddr, iph->saddr); | |
289 | if (!req) | |
290 | goto out; | |
291 | ||
292 | /* | |
293 | * ICMPs are not backlogged, hence we cannot get an established | |
294 | * socket here. | |
295 | */ | |
296 | BUG_TRAP(!req->sk); | |
297 | ||
298 | if (seq != dccp_rsk(req)->dreq_iss) { | |
299 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); | |
300 | goto out; | |
301 | } | |
302 | /* | |
303 | * Still in RESPOND, just remove it silently. | |
304 | * There is no good way to pass the error to the newly | |
305 | * created socket, and POSIX does not want network | |
306 | * errors returned from accept(). | |
307 | */ | |
308 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
309 | goto out; | |
310 | ||
311 | case DCCP_REQUESTING: | |
312 | case DCCP_RESPOND: | |
313 | if (!sock_owned_by_user(sk)) { | |
314 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
315 | sk->sk_err = err; | |
316 | ||
317 | sk->sk_error_report(sk); | |
318 | ||
319 | dccp_done(sk); | |
320 | } else | |
321 | sk->sk_err_soft = err; | |
322 | goto out; | |
323 | } | |
324 | ||
325 | /* If we've already connected we will keep trying | |
326 | * until we time out, or the user gives up. | |
327 | * | |
328 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
329 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
330 | * but it is obsoleted by pmtu discovery). | |
331 | * | |
332 | * Note, that in modern internet, where routing is unreliable | |
333 | * and in each dark corner broken firewalls sit, sending random | |
334 | * errors ordered by their masters even this two messages finally lose | |
335 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
336 | * | |
337 | * Now we are in compliance with RFCs. | |
338 | * --ANK (980905) | |
339 | */ | |
340 | ||
341 | inet = inet_sk(sk); | |
342 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
343 | sk->sk_err = err; | |
344 | sk->sk_error_report(sk); | |
345 | } else /* Only an error on timeout */ | |
346 | sk->sk_err_soft = err; | |
347 | out: | |
348 | bh_unlock_sock(sk); | |
349 | sock_put(sk); | |
350 | } | |
351 | ||
57cca05a | 352 | /* This routine computes an IPv4 DCCP checksum. */ |
f21e68ca | 353 | void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) |
57cca05a ACM |
354 | { |
355 | const struct inet_sock *inet = inet_sk(sk); | |
356 | struct dccp_hdr *dh = dccp_hdr(skb); | |
357 | ||
358 | dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr); | |
359 | } | |
360 | ||
f21e68ca ACM |
361 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
362 | ||
7c657876 ACM |
363 | static inline u64 dccp_v4_init_sequence(const struct sock *sk, |
364 | const struct sk_buff *skb) | |
365 | { | |
366 | return secure_dccp_sequence_number(skb->nh.iph->daddr, | |
367 | skb->nh.iph->saddr, | |
368 | dccp_hdr(skb)->dccph_dport, | |
369 | dccp_hdr(skb)->dccph_sport); | |
370 | } | |
371 | ||
7c657876 ACM |
372 | /* |
373 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
374 | * now create the new socket. | |
375 | * | |
376 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
377 | */ | |
378 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
379 | struct request_sock *req, | |
380 | struct dst_entry *dst) | |
381 | { | |
382 | struct inet_request_sock *ireq; | |
383 | struct inet_sock *newinet; | |
384 | struct dccp_sock *newdp; | |
385 | struct sock *newsk; | |
386 | ||
387 | if (sk_acceptq_is_full(sk)) | |
388 | goto exit_overflow; | |
389 | ||
390 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
391 | goto exit; | |
392 | ||
393 | newsk = dccp_create_openreq_child(sk, req, skb); | |
394 | if (newsk == NULL) | |
395 | goto exit; | |
396 | ||
397 | sk_setup_caps(newsk, dst); | |
398 | ||
399 | newdp = dccp_sk(newsk); | |
400 | newinet = inet_sk(newsk); | |
401 | ireq = inet_rsk(req); | |
402 | newinet->daddr = ireq->rmt_addr; | |
403 | newinet->rcv_saddr = ireq->loc_addr; | |
404 | newinet->saddr = ireq->loc_addr; | |
405 | newinet->opt = ireq->opt; | |
406 | ireq->opt = NULL; | |
407 | newinet->mc_index = inet_iif(skb); | |
408 | newinet->mc_ttl = skb->nh.iph->ttl; | |
409 | newinet->id = jiffies; | |
410 | ||
411 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
412 | ||
413 | __inet_hash(&dccp_hashinfo, newsk, 0); | |
414 | __inet_inherit_port(&dccp_hashinfo, sk, newsk); | |
415 | ||
416 | return newsk; | |
417 | ||
418 | exit_overflow: | |
419 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); | |
420 | exit: | |
421 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); | |
422 | dst_release(dst); | |
423 | return NULL; | |
424 | } | |
425 | ||
f21e68ca ACM |
426 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
427 | ||
7c657876 ACM |
428 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
429 | { | |
430 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
431 | const struct iphdr *iph = skb->nh.iph; | |
432 | struct sock *nsk; | |
433 | struct request_sock **prev; | |
434 | /* Find possible connection requests. */ | |
435 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
436 | dh->dccph_sport, | |
437 | iph->saddr, iph->daddr); | |
438 | if (req != NULL) | |
439 | return dccp_check_req(sk, skb, req, prev); | |
440 | ||
8f491069 HX |
441 | nsk = inet_lookup_established(&dccp_hashinfo, |
442 | iph->saddr, dh->dccph_sport, | |
443 | iph->daddr, dh->dccph_dport, | |
444 | inet_iif(skb)); | |
7c657876 ACM |
445 | if (nsk != NULL) { |
446 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
447 | bh_lock_sock(nsk); | |
448 | return nsk; | |
449 | } | |
9469c7b4 | 450 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
451 | return NULL; |
452 | } | |
453 | ||
454 | return sk; | |
455 | } | |
456 | ||
60fe62e7 AB |
457 | int dccp_v4_checksum(const struct sk_buff *skb, const __be32 saddr, |
458 | const __be32 daddr) | |
7c657876 | 459 | { |
95b81ef7 | 460 | const struct dccp_hdr* dh = dccp_hdr(skb); |
7c657876 ACM |
461 | int checksum_len; |
462 | u32 tmp; | |
463 | ||
464 | if (dh->dccph_cscov == 0) | |
465 | checksum_len = skb->len; | |
466 | else { | |
467 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
468 | checksum_len = checksum_len < skb->len ? checksum_len : |
469 | skb->len; | |
7c657876 ACM |
470 | } |
471 | ||
472 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
473 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
474 | IPPROTO_DCCP, tmp); | |
7c657876 ACM |
475 | } |
476 | ||
b61fafc4 ACM |
477 | EXPORT_SYMBOL_GPL(dccp_v4_checksum); |
478 | ||
95b81ef7 | 479 | static int dccp_v4_verify_checksum(struct sk_buff *skb, |
60fe62e7 | 480 | const __be32 saddr, const __be32 daddr) |
7c657876 | 481 | { |
95b81ef7 YN |
482 | struct dccp_hdr *dh = dccp_hdr(skb); |
483 | int checksum_len; | |
484 | u32 tmp; | |
7c657876 | 485 | |
95b81ef7 YN |
486 | if (dh->dccph_cscov == 0) |
487 | checksum_len = skb->len; | |
488 | else { | |
489 | checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32); | |
7690af3f ACM |
490 | checksum_len = checksum_len < skb->len ? checksum_len : |
491 | skb->len; | |
95b81ef7 YN |
492 | } |
493 | tmp = csum_partial((unsigned char *)dh, checksum_len, 0); | |
7690af3f ACM |
494 | return csum_tcpudp_magic(saddr, daddr, checksum_len, |
495 | IPPROTO_DCCP, tmp) == 0 ? 0 : -1; | |
7c657876 ACM |
496 | } |
497 | ||
498 | static struct dst_entry* dccp_v4_route_skb(struct sock *sk, | |
499 | struct sk_buff *skb) | |
500 | { | |
501 | struct rtable *rt; | |
502 | struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif, | |
503 | .nl_u = { .ip4_u = | |
504 | { .daddr = skb->nh.iph->saddr, | |
505 | .saddr = skb->nh.iph->daddr, | |
506 | .tos = RT_CONN_FLAGS(sk) } }, | |
507 | .proto = sk->sk_protocol, | |
508 | .uli_u = { .ports = | |
509 | { .sport = dccp_hdr(skb)->dccph_dport, | |
7690af3f ACM |
510 | .dport = dccp_hdr(skb)->dccph_sport } |
511 | } | |
512 | }; | |
7c657876 | 513 | |
beb8d13b | 514 | security_skb_classify_flow(skb, &fl); |
7c657876 ACM |
515 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { |
516 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
517 | return NULL; | |
518 | } | |
519 | ||
520 | return &rt->u.dst; | |
521 | } | |
522 | ||
3d2fe62b GR |
523 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
524 | struct dst_entry *dst) | |
525 | { | |
526 | int err = -1; | |
527 | struct sk_buff *skb; | |
528 | ||
529 | /* First, grab a route. */ | |
530 | ||
531 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
532 | goto out; | |
533 | ||
534 | skb = dccp_make_response(sk, dst, req); | |
535 | if (skb != NULL) { | |
536 | const struct inet_request_sock *ireq = inet_rsk(req); | |
537 | struct dccp_hdr *dh = dccp_hdr(skb); | |
538 | ||
539 | dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, | |
540 | ireq->rmt_addr); | |
541 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
542 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, | |
543 | ireq->rmt_addr, | |
544 | ireq->opt); | |
545 | if (err == NET_XMIT_CN) | |
546 | err = 0; | |
547 | } | |
548 | ||
549 | out: | |
550 | dst_release(dst); | |
551 | return err; | |
552 | } | |
553 | ||
a1d3a355 | 554 | static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) |
7c657876 ACM |
555 | { |
556 | int err; | |
557 | struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh; | |
558 | const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) + | |
559 | sizeof(struct dccp_hdr_ext) + | |
560 | sizeof(struct dccp_hdr_reset); | |
561 | struct sk_buff *skb; | |
562 | struct dst_entry *dst; | |
2807d4ff | 563 | u64 seqno; |
7c657876 ACM |
564 | |
565 | /* Never send a reset in response to a reset. */ | |
566 | if (rxdh->dccph_type == DCCP_PKT_RESET) | |
567 | return; | |
568 | ||
569 | if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL) | |
570 | return; | |
571 | ||
72478873 | 572 | dst = dccp_v4_route_skb(dccp_v4_ctl_socket->sk, rxskb); |
7c657876 ACM |
573 | if (dst == NULL) |
574 | return; | |
575 | ||
118b2c95 ACM |
576 | skb = alloc_skb(dccp_v4_ctl_socket->sk->sk_prot->max_header, |
577 | GFP_ATOMIC); | |
7c657876 ACM |
578 | if (skb == NULL) |
579 | goto out; | |
580 | ||
581 | /* Reserve space for headers. */ | |
118b2c95 | 582 | skb_reserve(skb, dccp_v4_ctl_socket->sk->sk_prot->max_header); |
7c657876 ACM |
583 | skb->dst = dst_clone(dst); |
584 | ||
9b42078e | 585 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
7c657876 ACM |
586 | |
587 | /* Build DCCP header and checksum it. */ | |
588 | dh->dccph_type = DCCP_PKT_RESET; | |
589 | dh->dccph_sport = rxdh->dccph_dport; | |
590 | dh->dccph_dport = rxdh->dccph_sport; | |
591 | dh->dccph_doff = dccp_hdr_reset_len / 4; | |
592 | dh->dccph_x = 1; | |
7690af3f ACM |
593 | dccp_hdr_reset(skb)->dccph_reset_code = |
594 | DCCP_SKB_CB(rxskb)->dccpd_reset_code; | |
7c657876 | 595 | |
0e64e94e | 596 | /* See "8.3.1. Abnormal Termination" in RFC 4340 */ |
2807d4ff ACM |
597 | seqno = 0; |
598 | if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) | |
599 | dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1); | |
600 | ||
601 | dccp_hdr_set_seq(dh, seqno); | |
7690af3f ACM |
602 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), |
603 | DCCP_SKB_CB(rxskb)->dccpd_seq); | |
7c657876 | 604 | |
95b81ef7 YN |
605 | dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr, |
606 | rxskb->nh.iph->daddr); | |
7c657876 | 607 | |
72478873 ACM |
608 | bh_lock_sock(dccp_v4_ctl_socket->sk); |
609 | err = ip_build_and_send_pkt(skb, dccp_v4_ctl_socket->sk, | |
7690af3f ACM |
610 | rxskb->nh.iph->daddr, |
611 | rxskb->nh.iph->saddr, NULL); | |
72478873 | 612 | bh_unlock_sock(dccp_v4_ctl_socket->sk); |
7c657876 ACM |
613 | |
614 | if (err == NET_XMIT_CN || err == 0) { | |
615 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); | |
616 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
617 | } | |
618 | out: | |
619 | dst_release(dst); | |
620 | } | |
621 | ||
3d2fe62b GR |
622 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
623 | { | |
624 | kfree(inet_rsk(req)->opt); | |
625 | } | |
626 | ||
627 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { | |
628 | .family = PF_INET, | |
629 | .obj_size = sizeof(struct dccp_request_sock), | |
630 | .rtx_syn_ack = dccp_v4_send_response, | |
631 | .send_ack = dccp_reqsk_send_ack, | |
632 | .destructor = dccp_v4_reqsk_destructor, | |
633 | .send_reset = dccp_v4_ctl_send_reset, | |
634 | }; | |
635 | ||
636 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
637 | { | |
638 | struct inet_request_sock *ireq; | |
639 | struct dccp_sock dp; | |
640 | struct request_sock *req; | |
641 | struct dccp_request_sock *dreq; | |
642 | const __be32 saddr = skb->nh.iph->saddr; | |
643 | const __be32 daddr = skb->nh.iph->daddr; | |
644 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; | |
645 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); | |
646 | __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; | |
647 | ||
648 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
649 | if (((struct rtable *)skb->dst)->rt_flags & | |
650 | (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
651 | reset_code = DCCP_RESET_CODE_NO_CONNECTION; | |
652 | goto drop; | |
653 | } | |
654 | ||
655 | if (dccp_bad_service_code(sk, service)) { | |
656 | reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; | |
657 | goto drop; | |
658 | } | |
659 | /* | |
660 | * TW buckets are converted to open requests without | |
661 | * limitations, they conserve resources and peer is | |
662 | * evidently real one. | |
663 | */ | |
664 | if (inet_csk_reqsk_queue_is_full(sk)) | |
665 | goto drop; | |
666 | ||
667 | /* | |
668 | * Accept backlog is full. If we have already queued enough | |
669 | * of warm entries in syn queue, drop request. It is better than | |
670 | * clogging syn queue with openreqs with exponentially increasing | |
671 | * timeout. | |
672 | */ | |
673 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
674 | goto drop; | |
675 | ||
676 | req = reqsk_alloc(&dccp_request_sock_ops); | |
677 | if (req == NULL) | |
678 | goto drop; | |
679 | ||
680 | if (dccp_parse_options(sk, skb)) | |
681 | goto drop_and_free; | |
682 | ||
683 | dccp_openreq_init(req, &dp, skb); | |
684 | ||
685 | if (security_inet_conn_request(sk, skb, req)) | |
686 | goto drop_and_free; | |
687 | ||
688 | ireq = inet_rsk(req); | |
689 | ireq->loc_addr = daddr; | |
690 | ireq->rmt_addr = saddr; | |
691 | req->rcv_wnd = dccp_feat_default_sequence_window; | |
692 | ireq->opt = NULL; | |
693 | ||
694 | /* | |
695 | * Step 3: Process LISTEN state | |
696 | * | |
697 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
698 | * | |
699 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
700 | * dccp_create_openreq_child. | |
701 | */ | |
702 | dreq = dccp_rsk(req); | |
703 | dreq->dreq_isr = dcb->dccpd_seq; | |
704 | dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); | |
705 | dreq->dreq_service = service; | |
706 | ||
707 | if (dccp_v4_send_response(sk, req, NULL)) | |
708 | goto drop_and_free; | |
709 | ||
710 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
711 | return 0; | |
712 | ||
713 | drop_and_free: | |
714 | reqsk_free(req); | |
715 | drop: | |
716 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
717 | dcb->dccpd_reset_code = reset_code; | |
718 | return -1; | |
719 | } | |
720 | ||
721 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
722 | ||
7c657876 ACM |
723 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
724 | { | |
725 | struct dccp_hdr *dh = dccp_hdr(skb); | |
726 | ||
727 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
728 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
729 | goto reset; | |
730 | return 0; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Step 3: Process LISTEN state | |
735 | * If S.state == LISTEN, | |
7690af3f ACM |
736 | * If P.type == Request or P contains a valid Init Cookie |
737 | * option, | |
7c657876 ACM |
738 | * * Must scan the packet's options to check for an Init |
739 | * Cookie. Only the Init Cookie is processed here, | |
740 | * however; other options are processed in Step 8. This | |
741 | * scan need only be performed if the endpoint uses Init | |
742 | * Cookies * | |
743 | * * Generate a new socket and switch to that socket * | |
744 | * Set S := new socket for this port pair | |
745 | * S.state = RESPOND | |
746 | * Choose S.ISS (initial seqno) or set from Init Cookie | |
747 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
748 | * Continue with S.state == RESPOND | |
749 | * * A Response packet will be generated in Step 11 * | |
750 | * Otherwise, | |
751 | * Generate Reset(No Connection) unless P.type == Reset | |
752 | * Drop packet and return | |
753 | * | |
7690af3f ACM |
754 | * NOTE: the check for the packet types is done in |
755 | * dccp_rcv_state_process | |
7c657876 ACM |
756 | */ |
757 | if (sk->sk_state == DCCP_LISTEN) { | |
758 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
759 | ||
760 | if (nsk == NULL) | |
761 | goto discard; | |
762 | ||
763 | if (nsk != sk) { | |
764 | if (dccp_child_process(sk, nsk, skb)) | |
765 | goto reset; | |
766 | return 0; | |
767 | } | |
768 | } | |
769 | ||
770 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
771 | goto reset; | |
772 | return 0; | |
773 | ||
774 | reset: | |
7c657876 ACM |
775 | dccp_v4_ctl_send_reset(skb); |
776 | discard: | |
777 | kfree_skb(skb); | |
778 | return 0; | |
779 | } | |
780 | ||
f21e68ca ACM |
781 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
782 | ||
783 | int dccp_invalid_packet(struct sk_buff *skb) | |
7c657876 ACM |
784 | { |
785 | const struct dccp_hdr *dh; | |
786 | ||
787 | if (skb->pkt_type != PACKET_HOST) | |
788 | return 1; | |
789 | ||
790 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { | |
c59eab46 | 791 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); |
7c657876 ACM |
792 | return 1; |
793 | } | |
794 | ||
795 | dh = dccp_hdr(skb); | |
796 | ||
797 | /* If the packet type is not understood, drop packet and return */ | |
798 | if (dh->dccph_type >= DCCP_PKT_INVALID) { | |
c59eab46 | 799 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); |
7c657876 ACM |
800 | return 1; |
801 | } | |
802 | ||
803 | /* | |
804 | * If P.Data Offset is too small for packet type, or too large for | |
805 | * packet, drop packet and return | |
806 | */ | |
807 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
c59eab46 ACM |
808 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
809 | "too small 1\n", | |
810 | dh->dccph_doff); | |
7c657876 ACM |
811 | return 1; |
812 | } | |
813 | ||
814 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { | |
c59eab46 ACM |
815 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " |
816 | "too small 2\n", | |
817 | dh->dccph_doff); | |
7c657876 ACM |
818 | return 1; |
819 | } | |
820 | ||
821 | dh = dccp_hdr(skb); | |
822 | ||
823 | /* | |
824 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
825 | * has short sequence numbers), drop packet and return | |
826 | */ | |
827 | if (dh->dccph_x == 0 && | |
828 | dh->dccph_type != DCCP_PKT_DATA && | |
829 | dh->dccph_type != DCCP_PKT_ACK && | |
830 | dh->dccph_type != DCCP_PKT_DATAACK) { | |
c59eab46 ACM |
831 | LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack " |
832 | "nor DataAck and P.X == 0\n", | |
833 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
834 | return 1; |
835 | } | |
836 | ||
7c657876 ACM |
837 | return 0; |
838 | } | |
839 | ||
f21e68ca ACM |
840 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
841 | ||
7c657876 | 842 | /* this is called when real data arrives */ |
b61fafc4 | 843 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
844 | { |
845 | const struct dccp_hdr *dh; | |
846 | struct sock *sk; | |
7c657876 ACM |
847 | |
848 | /* Step 1: Check header basics: */ | |
849 | ||
850 | if (dccp_invalid_packet(skb)) | |
851 | goto discard_it; | |
852 | ||
f21e68ca ACM |
853 | /* If the header checksum is incorrect, drop packet and return */ |
854 | if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr, | |
855 | skb->nh.iph->daddr) < 0) { | |
856 | LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n", | |
857 | __FUNCTION__); | |
858 | goto discard_it; | |
859 | } | |
860 | ||
7c657876 | 861 | dh = dccp_hdr(skb); |
7c657876 | 862 | |
7c657876 ACM |
863 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb); |
864 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; | |
865 | ||
866 | dccp_pr_debug("%8.8s " | |
867 | "src=%u.%u.%u.%u@%-5d " | |
868 | "dst=%u.%u.%u.%u@%-5d seq=%llu", | |
869 | dccp_packet_name(dh->dccph_type), | |
870 | NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport), | |
871 | NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport), | |
f6ccf554 | 872 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
873 | |
874 | if (dccp_packet_without_ack(skb)) { | |
875 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
876 | dccp_pr_debug_cat("\n"); | |
877 | } else { | |
878 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 879 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 880 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
881 | } |
882 | ||
883 | /* Step 2: | |
884 | * Look up flow ID in table and get corresponding socket */ | |
885 | sk = __inet_lookup(&dccp_hashinfo, | |
886 | skb->nh.iph->saddr, dh->dccph_sport, | |
8f491069 | 887 | skb->nh.iph->daddr, dh->dccph_dport, |
7c657876 ACM |
888 | inet_iif(skb)); |
889 | ||
890 | /* | |
891 | * Step 2: | |
892 | * If no socket ... | |
893 | * Generate Reset(No Connection) unless P.type == Reset | |
894 | * Drop packet and return | |
895 | */ | |
896 | if (sk == NULL) { | |
897 | dccp_pr_debug("failed to look up flow ID in table and " | |
898 | "get corresponding socket\n"); | |
899 | goto no_dccp_socket; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Step 2: | |
904 | * ... or S.state == TIMEWAIT, | |
905 | * Generate Reset(No Connection) unless P.type == Reset | |
906 | * Drop packet and return | |
907 | */ | |
7c657876 | 908 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
909 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
910 | inet_twsk_put(inet_twsk(sk)); | |
911 | goto no_dccp_socket; | |
7c657876 ACM |
912 | } |
913 | ||
25995ff5 | 914 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 915 | goto discard_and_relse; |
eb9c7ebe | 916 | nf_reset(skb); |
7c657876 | 917 | |
25995ff5 | 918 | return sk_receive_skb(sk, skb); |
7c657876 ACM |
919 | |
920 | no_dccp_socket: | |
921 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
922 | goto discard_it; | |
923 | /* | |
924 | * Step 2: | |
925 | * Generate Reset(No Connection) unless P.type == Reset | |
926 | * Drop packet and return | |
927 | */ | |
928 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
929 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
930 | DCCP_RESET_CODE_NO_CONNECTION; | |
7c657876 ACM |
931 | dccp_v4_ctl_send_reset(skb); |
932 | } | |
933 | ||
934 | discard_it: | |
7c657876 ACM |
935 | kfree_skb(skb); |
936 | return 0; | |
937 | ||
938 | discard_and_relse: | |
939 | sock_put(sk); | |
940 | goto discard_it; | |
941 | } | |
942 | ||
b61fafc4 | 943 | static struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
944 | .queue_xmit = ip_queue_xmit, |
945 | .send_check = dccp_v4_send_check, | |
946 | .rebuild_header = inet_sk_rebuild_header, | |
947 | .conn_request = dccp_v4_conn_request, | |
948 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
949 | .net_header_len = sizeof(struct iphdr), | |
950 | .setsockopt = ip_setsockopt, | |
951 | .getsockopt = ip_getsockopt, | |
952 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
953 | .sockaddr_len = sizeof(struct sockaddr_in), | |
3fdadf7d | 954 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
955 | .compat_setsockopt = compat_ip_setsockopt, |
956 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 957 | #endif |
57cca05a ACM |
958 | }; |
959 | ||
3e0fadc5 | 960 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 961 | { |
72478873 ACM |
962 | static __u8 dccp_v4_ctl_sock_initialized; |
963 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 964 | |
72478873 ACM |
965 | if (err == 0) { |
966 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
967 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 968 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
969 | } |
970 | ||
3e0fadc5 | 971 | return err; |
7c657876 ACM |
972 | } |
973 | ||
6d6ee43e ACM |
974 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
975 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
976 | }; | |
977 | ||
5e0817f8 | 978 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
979 | .name = "DCCP", |
980 | .owner = THIS_MODULE, | |
981 | .close = dccp_close, | |
982 | .connect = dccp_v4_connect, | |
983 | .disconnect = dccp_disconnect, | |
984 | .ioctl = dccp_ioctl, | |
985 | .init = dccp_v4_init_sock, | |
986 | .setsockopt = dccp_setsockopt, | |
987 | .getsockopt = dccp_getsockopt, | |
988 | .sendmsg = dccp_sendmsg, | |
989 | .recvmsg = dccp_recvmsg, | |
990 | .backlog_rcv = dccp_v4_do_rcv, | |
c985ed70 | 991 | .hash = dccp_hash, |
f21e68ca | 992 | .unhash = dccp_unhash, |
7c657876 ACM |
993 | .accept = inet_csk_accept, |
994 | .get_port = dccp_v4_get_port, | |
995 | .shutdown = dccp_shutdown, | |
3e0fadc5 | 996 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
997 | .orphan_count = &dccp_orphan_count, |
998 | .max_header = MAX_DCCP_HEADER, | |
999 | .obj_size = sizeof(struct dccp_sock), | |
1000 | .rsk_prot = &dccp_request_sock_ops, | |
6d6ee43e | 1001 | .twsk_prot = &dccp_timewait_sock_ops, |
543d9cfe ACM |
1002 | #ifdef CONFIG_COMPAT |
1003 | .compat_setsockopt = compat_dccp_setsockopt, | |
1004 | .compat_getsockopt = compat_dccp_getsockopt, | |
1005 | #endif | |
7c657876 | 1006 | }; |
6d6ee43e | 1007 | |
b61fafc4 ACM |
1008 | static struct net_protocol dccp_v4_protocol = { |
1009 | .handler = dccp_v4_rcv, | |
1010 | .err_handler = dccp_v4_err, | |
1011 | .no_policy = 1, | |
1012 | }; | |
1013 | ||
1014 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
1015 | .family = PF_INET, |
1016 | .owner = THIS_MODULE, | |
1017 | .release = inet_release, | |
1018 | .bind = inet_bind, | |
1019 | .connect = inet_stream_connect, | |
1020 | .socketpair = sock_no_socketpair, | |
1021 | .accept = inet_accept, | |
1022 | .getname = inet_getname, | |
b61fafc4 | 1023 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
1024 | .poll = dccp_poll, |
1025 | .ioctl = inet_ioctl, | |
b61fafc4 | 1026 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
1027 | .listen = inet_dccp_listen, |
1028 | .shutdown = inet_shutdown, | |
1029 | .setsockopt = sock_common_setsockopt, | |
1030 | .getsockopt = sock_common_getsockopt, | |
1031 | .sendmsg = inet_sendmsg, | |
1032 | .recvmsg = sock_common_recvmsg, | |
1033 | .mmap = sock_no_mmap, | |
1034 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 1035 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1036 | .compat_setsockopt = compat_sock_common_setsockopt, |
1037 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1038 | #endif |
b61fafc4 ACM |
1039 | }; |
1040 | ||
1041 | static struct inet_protosw dccp_v4_protosw = { | |
1042 | .type = SOCK_DCCP, | |
1043 | .protocol = IPPROTO_DCCP, | |
1044 | .prot = &dccp_v4_prot, | |
1045 | .ops = &inet_dccp_ops, | |
1046 | .capability = -1, | |
1047 | .no_check = 0, | |
1048 | .flags = INET_PROTOSW_ICSK, | |
1049 | }; | |
1050 | ||
b61fafc4 ACM |
1051 | static int __init dccp_v4_init(void) |
1052 | { | |
1053 | int err = proto_register(&dccp_v4_prot, 1); | |
1054 | ||
1055 | if (err != 0) | |
1056 | goto out; | |
1057 | ||
1058 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1059 | if (err != 0) | |
1060 | goto out_proto_unregister; | |
1061 | ||
1062 | inet_register_protosw(&dccp_v4_protosw); | |
1063 | ||
c4d93909 ACM |
1064 | err = inet_csk_ctl_sock_create(&dccp_v4_ctl_socket, PF_INET, |
1065 | SOCK_DCCP, IPPROTO_DCCP); | |
b61fafc4 ACM |
1066 | if (err) |
1067 | goto out_unregister_protosw; | |
1068 | out: | |
1069 | return err; | |
1070 | out_unregister_protosw: | |
1071 | inet_unregister_protosw(&dccp_v4_protosw); | |
1072 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1073 | out_proto_unregister: | |
1074 | proto_unregister(&dccp_v4_prot); | |
1075 | goto out; | |
1076 | } | |
1077 | ||
1078 | static void __exit dccp_v4_exit(void) | |
1079 | { | |
1080 | inet_unregister_protosw(&dccp_v4_protosw); | |
1081 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1082 | proto_unregister(&dccp_v4_prot); | |
1083 | } | |
1084 | ||
1085 | module_init(dccp_v4_init); | |
1086 | module_exit(dccp_v4_exit); | |
1087 | ||
1088 | /* | |
1089 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1090 | * values directly, Also cover the case where the protocol is not specified, | |
1091 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1092 | */ | |
1093 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-33-type-6"); | |
1094 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-0-type-6"); | |
1095 | MODULE_LICENSE("GPL"); | |
1096 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1097 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |