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> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7c657876 ACM |
16 | #include <linux/module.h> |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/random.h> | |
19 | ||
20 | #include <net/icmp.h> | |
b61fafc4 | 21 | #include <net/inet_common.h> |
7c657876 | 22 | #include <net/inet_hashtables.h> |
14c85021 | 23 | #include <net/inet_sock.h> |
b61fafc4 | 24 | #include <net/protocol.h> |
7c657876 | 25 | #include <net/sock.h> |
6d6ee43e | 26 | #include <net/timewait_sock.h> |
7c657876 ACM |
27 | #include <net/tcp_states.h> |
28 | #include <net/xfrm.h> | |
29 | ||
ae31c339 | 30 | #include "ackvec.h" |
7c657876 ACM |
31 | #include "ccid.h" |
32 | #include "dccp.h" | |
afe00251 | 33 | #include "feat.h" |
7c657876 | 34 | |
72478873 | 35 | /* |
13f51d82 | 36 | * The per-net dccp.v4_ctl_sk socket is used for responding to |
72478873 ACM |
37 | * the Out-of-the-blue (OOTB) packets. A control sock will be created |
38 | * for this socket at the initialization time. | |
39 | */ | |
72478873 | 40 | |
f21e68ca | 41 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
7c657876 | 42 | { |
2d7192d6 | 43 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
7c657876 ACM |
44 | struct inet_sock *inet = inet_sk(sk); |
45 | struct dccp_sock *dp = dccp_sk(sk); | |
dca8b089 | 46 | __be16 orig_sport, orig_dport; |
bada8adc | 47 | __be32 daddr, nexthop; |
2c42758c | 48 | struct flowi4 *fl4; |
2d7192d6 | 49 | struct rtable *rt; |
7c657876 | 50 | int err; |
f6d8bd05 | 51 | struct ip_options_rcu *inet_opt; |
7c657876 ACM |
52 | |
53 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
54 | ||
55 | if (addr_len < sizeof(struct sockaddr_in)) | |
56 | return -EINVAL; | |
57 | ||
58 | if (usin->sin_family != AF_INET) | |
59 | return -EAFNOSUPPORT; | |
60 | ||
61 | nexthop = daddr = usin->sin_addr.s_addr; | |
f6d8bd05 ED |
62 | |
63 | inet_opt = rcu_dereference_protected(inet->inet_opt, | |
64 | sock_owned_by_user(sk)); | |
65 | if (inet_opt != NULL && inet_opt->opt.srr) { | |
7c657876 ACM |
66 | if (daddr == 0) |
67 | return -EINVAL; | |
f6d8bd05 | 68 | nexthop = inet_opt->opt.faddr; |
7c657876 ACM |
69 | } |
70 | ||
dca8b089 DM |
71 | orig_sport = inet->inet_sport; |
72 | orig_dport = usin->sin_port; | |
2c42758c DM |
73 | fl4 = &inet->cork.fl.u.ip4; |
74 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, | |
b23dd4fe DM |
75 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
76 | IPPROTO_DCCP, | |
77 | orig_sport, orig_dport, sk, true); | |
78 | if (IS_ERR(rt)) | |
79 | return PTR_ERR(rt); | |
7c657876 ACM |
80 | |
81 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
82 | ip_rt_put(rt); | |
83 | return -ENETUNREACH; | |
84 | } | |
85 | ||
f6d8bd05 | 86 | if (inet_opt == NULL || !inet_opt->opt.srr) |
2c42758c | 87 | daddr = fl4->daddr; |
7c657876 | 88 | |
c720c7e8 | 89 | if (inet->inet_saddr == 0) |
2c42758c | 90 | inet->inet_saddr = fl4->saddr; |
c720c7e8 | 91 | inet->inet_rcv_saddr = inet->inet_saddr; |
7c657876 | 92 | |
c720c7e8 ED |
93 | inet->inet_dport = usin->sin_port; |
94 | inet->inet_daddr = daddr; | |
7c657876 | 95 | |
d83d8461 | 96 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
f6d8bd05 ED |
97 | if (inet_opt) |
98 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
7c657876 ACM |
99 | /* |
100 | * Socket identity is still unknown (sport may be zero). | |
101 | * However we set state to DCCP_REQUESTING and not releasing socket | |
102 | * lock select source port, enter ourselves into the hash tables and | |
103 | * complete initialization after this. | |
104 | */ | |
105 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 106 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
107 | if (err != 0) |
108 | goto failure; | |
109 | ||
2c42758c | 110 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
b23dd4fe DM |
111 | inet->inet_sport, inet->inet_dport, sk); |
112 | if (IS_ERR(rt)) { | |
113 | rt = NULL; | |
7c657876 | 114 | goto failure; |
b23dd4fe | 115 | } |
7c657876 | 116 | /* OK, now commit destination to socket. */ |
d8d1f30b | 117 | sk_setup_caps(sk, &rt->dst); |
7c657876 | 118 | |
c720c7e8 ED |
119 | dp->dccps_iss = secure_dccp_sequence_number(inet->inet_saddr, |
120 | inet->inet_daddr, | |
121 | inet->inet_sport, | |
122 | inet->inet_dport); | |
123 | inet->inet_id = dp->dccps_iss ^ jiffies; | |
7c657876 ACM |
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; | |
c720c7e8 | 138 | inet->inet_dport = 0; |
7c657876 ACM |
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. | |
c9eaf173 | 165 | * There is a small race when the user changes this flag in the |
7c657876 ACM |
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; | |
18e1d836 WY |
211 | const u8 offset = iph->ihl << 2; |
212 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
7c657876 ACM |
213 | struct dccp_sock *dp; |
214 | struct inet_sock *inet; | |
88c7664f ACM |
215 | const int type = icmp_hdr(skb)->type; |
216 | const int code = icmp_hdr(skb)->code; | |
7c657876 ACM |
217 | struct sock *sk; |
218 | __u64 seq; | |
219 | int err; | |
fd54d716 | 220 | struct net *net = dev_net(skb->dev); |
7c657876 | 221 | |
18e1d836 WY |
222 | if (skb->len < offset + sizeof(*dh) || |
223 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
dcfc23ca | 224 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
225 | return; |
226 | } | |
227 | ||
fd54d716 | 228 | sk = inet_lookup(net, &dccp_hashinfo, |
b9901a84 PE |
229 | iph->daddr, dh->dccph_dport, |
230 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
7c657876 | 231 | if (sk == NULL) { |
dcfc23ca | 232 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
233 | return; |
234 | } | |
235 | ||
236 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 237 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
238 | return; |
239 | } | |
240 | ||
241 | bh_lock_sock(sk); | |
242 | /* If too many ICMPs get dropped on busy | |
243 | * servers this needs to be solved differently. | |
244 | */ | |
245 | if (sock_owned_by_user(sk)) | |
de0744af | 246 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
7c657876 ACM |
247 | |
248 | if (sk->sk_state == DCCP_CLOSED) | |
249 | goto out; | |
250 | ||
251 | dp = dccp_sk(sk); | |
fde20105 | 252 | seq = dccp_hdr_seq(dh); |
1238d087 | 253 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
d68f0866 | 254 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { |
de0744af | 255 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
256 | goto out; |
257 | } | |
258 | ||
259 | switch (type) { | |
260 | case ICMP_SOURCE_QUENCH: | |
261 | /* Just silently ignore these. */ | |
262 | goto out; | |
263 | case ICMP_PARAMETERPROB: | |
264 | err = EPROTO; | |
265 | break; | |
266 | case ICMP_DEST_UNREACH: | |
267 | if (code > NR_ICMP_UNREACH) | |
268 | goto out; | |
269 | ||
270 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
271 | if (!sock_owned_by_user(sk)) | |
272 | dccp_do_pmtu_discovery(sk, iph, info); | |
273 | goto out; | |
274 | } | |
275 | ||
276 | err = icmp_err_convert[code].errno; | |
277 | break; | |
278 | case ICMP_TIME_EXCEEDED: | |
279 | err = EHOSTUNREACH; | |
280 | break; | |
281 | default: | |
282 | goto out; | |
283 | } | |
284 | ||
285 | switch (sk->sk_state) { | |
286 | struct request_sock *req , **prev; | |
287 | case DCCP_LISTEN: | |
288 | if (sock_owned_by_user(sk)) | |
289 | goto out; | |
290 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
291 | iph->daddr, iph->saddr); | |
292 | if (!req) | |
293 | goto out; | |
294 | ||
295 | /* | |
296 | * ICMPs are not backlogged, hence we cannot get an established | |
297 | * socket here. | |
298 | */ | |
547b792c | 299 | WARN_ON(req->sk); |
7c657876 ACM |
300 | |
301 | if (seq != dccp_rsk(req)->dreq_iss) { | |
de0744af | 302 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
303 | goto out; |
304 | } | |
305 | /* | |
306 | * Still in RESPOND, just remove it silently. | |
307 | * There is no good way to pass the error to the newly | |
308 | * created socket, and POSIX does not want network | |
309 | * errors returned from accept(). | |
310 | */ | |
311 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
312 | goto out; | |
313 | ||
314 | case DCCP_REQUESTING: | |
315 | case DCCP_RESPOND: | |
316 | if (!sock_owned_by_user(sk)) { | |
317 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
318 | sk->sk_err = err; | |
319 | ||
320 | sk->sk_error_report(sk); | |
321 | ||
322 | dccp_done(sk); | |
323 | } else | |
324 | sk->sk_err_soft = err; | |
325 | goto out; | |
326 | } | |
327 | ||
328 | /* If we've already connected we will keep trying | |
329 | * until we time out, or the user gives up. | |
330 | * | |
331 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
332 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
333 | * but it is obsoleted by pmtu discovery). | |
334 | * | |
335 | * Note, that in modern internet, where routing is unreliable | |
336 | * and in each dark corner broken firewalls sit, sending random | |
337 | * errors ordered by their masters even this two messages finally lose | |
338 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
339 | * | |
340 | * Now we are in compliance with RFCs. | |
341 | * --ANK (980905) | |
342 | */ | |
343 | ||
344 | inet = inet_sk(sk); | |
345 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
346 | sk->sk_err = err; | |
347 | sk->sk_error_report(sk); | |
348 | } else /* Only an error on timeout */ | |
349 | sk->sk_err_soft = err; | |
350 | out: | |
351 | bh_unlock_sock(sk); | |
352 | sock_put(sk); | |
353 | } | |
354 | ||
2bda2853 | 355 | static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
356 | __be32 src, __be32 dst) |
357 | { | |
358 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
359 | } | |
360 | ||
bb296246 | 361 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
57cca05a ACM |
362 | { |
363 | const struct inet_sock *inet = inet_sk(sk); | |
364 | struct dccp_hdr *dh = dccp_hdr(skb); | |
365 | ||
6f4e5fff | 366 | dccp_csum_outgoing(skb); |
c720c7e8 ED |
367 | dh->dccph_checksum = dccp_v4_csum_finish(skb, |
368 | inet->inet_saddr, | |
369 | inet->inet_daddr); | |
57cca05a ACM |
370 | } |
371 | ||
f21e68ca ACM |
372 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
373 | ||
865e9022 | 374 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 | 375 | { |
eddc9ec5 ACM |
376 | return secure_dccp_sequence_number(ip_hdr(skb)->daddr, |
377 | ip_hdr(skb)->saddr, | |
7c657876 ACM |
378 | dccp_hdr(skb)->dccph_dport, |
379 | dccp_hdr(skb)->dccph_sport); | |
380 | } | |
381 | ||
7c657876 ACM |
382 | /* |
383 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
384 | * now create the new socket. | |
385 | * | |
386 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
387 | */ | |
388 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
389 | struct request_sock *req, | |
390 | struct dst_entry *dst) | |
391 | { | |
392 | struct inet_request_sock *ireq; | |
393 | struct inet_sock *newinet; | |
7c657876 ACM |
394 | struct sock *newsk; |
395 | ||
396 | if (sk_acceptq_is_full(sk)) | |
397 | goto exit_overflow; | |
398 | ||
399 | if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) | |
400 | goto exit; | |
401 | ||
402 | newsk = dccp_create_openreq_child(sk, req, skb); | |
403 | if (newsk == NULL) | |
093d2823 | 404 | goto exit_nonewsk; |
7c657876 ACM |
405 | |
406 | sk_setup_caps(newsk, dst); | |
407 | ||
7c657876 ACM |
408 | newinet = inet_sk(newsk); |
409 | ireq = inet_rsk(req); | |
c720c7e8 ED |
410 | newinet->inet_daddr = ireq->rmt_addr; |
411 | newinet->inet_rcv_saddr = ireq->loc_addr; | |
412 | newinet->inet_saddr = ireq->loc_addr; | |
f6d8bd05 | 413 | newinet->inet_opt = ireq->opt; |
7c657876 ACM |
414 | ireq->opt = NULL; |
415 | newinet->mc_index = inet_iif(skb); | |
eddc9ec5 | 416 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
c720c7e8 | 417 | newinet->inet_id = jiffies; |
7c657876 ACM |
418 | |
419 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
420 | ||
093d2823 BS |
421 | if (__inet_inherit_port(sk, newsk) < 0) { |
422 | sock_put(newsk); | |
423 | goto exit; | |
424 | } | |
9327f705 | 425 | __inet_hash_nolisten(newsk, NULL); |
7c657876 ACM |
426 | |
427 | return newsk; | |
428 | ||
429 | exit_overflow: | |
de0744af | 430 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
431 | exit_nonewsk: |
432 | dst_release(dst); | |
7c657876 | 433 | exit: |
de0744af | 434 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
7c657876 ACM |
435 | return NULL; |
436 | } | |
437 | ||
f21e68ca ACM |
438 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
439 | ||
7c657876 ACM |
440 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
441 | { | |
442 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
eddc9ec5 | 443 | const struct iphdr *iph = ip_hdr(skb); |
7c657876 ACM |
444 | struct sock *nsk; |
445 | struct request_sock **prev; | |
446 | /* Find possible connection requests. */ | |
447 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
448 | dh->dccph_sport, | |
449 | iph->saddr, iph->daddr); | |
450 | if (req != NULL) | |
451 | return dccp_check_req(sk, skb, req, prev); | |
452 | ||
b9901a84 | 453 | nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo, |
8f491069 HX |
454 | iph->saddr, dh->dccph_sport, |
455 | iph->daddr, dh->dccph_dport, | |
456 | inet_iif(skb)); | |
7c657876 ACM |
457 | if (nsk != NULL) { |
458 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
459 | bh_lock_sock(nsk); | |
460 | return nsk; | |
461 | } | |
9469c7b4 | 462 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
463 | return NULL; |
464 | } | |
465 | ||
466 | return sk; | |
467 | } | |
468 | ||
f5487398 | 469 | static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk, |
7c657876 ACM |
470 | struct sk_buff *skb) |
471 | { | |
472 | struct rtable *rt; | |
9d6ec938 DM |
473 | struct flowi4 fl4 = { |
474 | .flowi4_oif = skb_rtable(skb)->rt_iif, | |
475 | .daddr = ip_hdr(skb)->saddr, | |
476 | .saddr = ip_hdr(skb)->daddr, | |
477 | .flowi4_tos = RT_CONN_FLAGS(sk), | |
478 | .flowi4_proto = sk->sk_protocol, | |
9cce96df DM |
479 | .fl4_sport = dccp_hdr(skb)->dccph_dport, |
480 | .fl4_dport = dccp_hdr(skb)->dccph_sport, | |
1d28f42c | 481 | }; |
7c657876 | 482 | |
9d6ec938 DM |
483 | security_skb_classify_flow(skb, flowi4_to_flowi(&fl4)); |
484 | rt = ip_route_output_flow(net, &fl4, sk); | |
b23dd4fe | 485 | if (IS_ERR(rt)) { |
7c73a6fa | 486 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
7c657876 ACM |
487 | return NULL; |
488 | } | |
489 | ||
d8d1f30b | 490 | return &rt->dst; |
7c657876 ACM |
491 | } |
492 | ||
e6b4d113 WAS |
493 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
494 | struct request_values *rv_unused) | |
3d2fe62b GR |
495 | { |
496 | int err = -1; | |
497 | struct sk_buff *skb; | |
fd80eb94 | 498 | struct dst_entry *dst; |
3d2fe62b | 499 | |
fd80eb94 DL |
500 | dst = inet_csk_route_req(sk, req); |
501 | if (dst == NULL) | |
3d2fe62b GR |
502 | goto out; |
503 | ||
504 | skb = dccp_make_response(sk, dst, req); | |
505 | if (skb != NULL) { | |
506 | const struct inet_request_sock *ireq = inet_rsk(req); | |
507 | struct dccp_hdr *dh = dccp_hdr(skb); | |
508 | ||
6f4e5fff GR |
509 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->loc_addr, |
510 | ireq->rmt_addr); | |
3d2fe62b GR |
511 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
512 | ireq->rmt_addr, | |
513 | ireq->opt); | |
b9df3cb8 | 514 | err = net_xmit_eval(err); |
3d2fe62b GR |
515 | } |
516 | ||
517 | out: | |
518 | dst_release(dst); | |
519 | return err; | |
520 | } | |
521 | ||
cfb6eeb4 | 522 | static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
7c657876 ACM |
523 | { |
524 | int err; | |
eddc9ec5 | 525 | const struct iphdr *rxiph; |
7c657876 ACM |
526 | struct sk_buff *skb; |
527 | struct dst_entry *dst; | |
adf30907 | 528 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
b76c4b27 | 529 | struct sock *ctl_sk = net->dccp.v4_ctl_sk; |
7c657876 ACM |
530 | |
531 | /* Never send a reset in response to a reset. */ | |
e356d37a | 532 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
7c657876 ACM |
533 | return; |
534 | ||
511c3f92 | 535 | if (skb_rtable(rxskb)->rt_type != RTN_LOCAL) |
7c657876 ACM |
536 | return; |
537 | ||
f5487398 | 538 | dst = dccp_v4_route_skb(net, ctl_sk, rxskb); |
7c657876 ACM |
539 | if (dst == NULL) |
540 | return; | |
541 | ||
7b1cffa8 | 542 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
7c657876 ACM |
543 | if (skb == NULL) |
544 | goto out; | |
545 | ||
eddc9ec5 | 546 | rxiph = ip_hdr(rxskb); |
e356d37a GR |
547 | dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr, |
548 | rxiph->daddr); | |
adf30907 | 549 | skb_dst_set(skb, dst_clone(dst)); |
7c657876 | 550 | |
7b1cffa8 PE |
551 | bh_lock_sock(ctl_sk); |
552 | err = ip_build_and_send_pkt(skb, ctl_sk, | |
eddc9ec5 | 553 | rxiph->daddr, rxiph->saddr, NULL); |
7b1cffa8 | 554 | bh_unlock_sock(ctl_sk); |
7c657876 | 555 | |
b9df3cb8 | 556 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
557 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
558 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
559 | } | |
560 | out: | |
561 | dst_release(dst); | |
562 | } | |
563 | ||
3d2fe62b GR |
564 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
565 | { | |
d99a7bd2 | 566 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3d2fe62b GR |
567 | kfree(inet_rsk(req)->opt); |
568 | } | |
569 | ||
570 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { | |
571 | .family = PF_INET, | |
572 | .obj_size = sizeof(struct dccp_request_sock), | |
573 | .rtx_syn_ack = dccp_v4_send_response, | |
574 | .send_ack = dccp_reqsk_send_ack, | |
575 | .destructor = dccp_v4_reqsk_destructor, | |
576 | .send_reset = dccp_v4_ctl_send_reset, | |
577 | }; | |
578 | ||
579 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
580 | { | |
581 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
582 | struct request_sock *req; |
583 | struct dccp_request_sock *dreq; | |
8109b02b | 584 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3d2fe62b | 585 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3d2fe62b GR |
586 | |
587 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
511c3f92 | 588 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
4a5409a5 | 589 | return 0; /* discard, don't send a reset here */ |
3d2fe62b GR |
590 | |
591 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 592 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3d2fe62b | 593 | goto drop; |
8109b02b | 594 | } |
3d2fe62b GR |
595 | /* |
596 | * TW buckets are converted to open requests without | |
597 | * limitations, they conserve resources and peer is | |
598 | * evidently real one. | |
599 | */ | |
4a5409a5 | 600 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3d2fe62b GR |
601 | if (inet_csk_reqsk_queue_is_full(sk)) |
602 | goto drop; | |
603 | ||
604 | /* | |
605 | * Accept backlog is full. If we have already queued enough | |
606 | * of warm entries in syn queue, drop request. It is better than | |
607 | * clogging syn queue with openreqs with exponentially increasing | |
608 | * timeout. | |
609 | */ | |
610 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
611 | goto drop; | |
612 | ||
ce4a7d0d | 613 | req = inet_reqsk_alloc(&dccp_request_sock_ops); |
3d2fe62b GR |
614 | if (req == NULL) |
615 | goto drop; | |
616 | ||
ac75773c GR |
617 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
618 | goto drop_and_free; | |
3d2fe62b | 619 | |
8b819412 GR |
620 | dreq = dccp_rsk(req); |
621 | if (dccp_parse_options(sk, dreq, skb)) | |
622 | goto drop_and_free; | |
623 | ||
3d2fe62b GR |
624 | if (security_inet_conn_request(sk, skb, req)) |
625 | goto drop_and_free; | |
626 | ||
627 | ireq = inet_rsk(req); | |
eddc9ec5 ACM |
628 | ireq->loc_addr = ip_hdr(skb)->daddr; |
629 | ireq->rmt_addr = ip_hdr(skb)->saddr; | |
3d2fe62b | 630 | |
8109b02b | 631 | /* |
3d2fe62b GR |
632 | * Step 3: Process LISTEN state |
633 | * | |
634 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
635 | * | |
636 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
637 | * dccp_create_openreq_child. | |
638 | */ | |
3d2fe62b | 639 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 640 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
3d2fe62b GR |
641 | dreq->dreq_service = service; |
642 | ||
e6b4d113 | 643 | if (dccp_v4_send_response(sk, req, NULL)) |
3d2fe62b GR |
644 | goto drop_and_free; |
645 | ||
646 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
647 | return 0; | |
648 | ||
649 | drop_and_free: | |
650 | reqsk_free(req); | |
651 | drop: | |
652 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3d2fe62b GR |
653 | return -1; |
654 | } | |
655 | ||
656 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
657 | ||
7c657876 ACM |
658 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
659 | { | |
660 | struct dccp_hdr *dh = dccp_hdr(skb); | |
661 | ||
662 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
663 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
664 | goto reset; | |
665 | return 0; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Step 3: Process LISTEN state | |
d83ca5ac GR |
670 | * If P.type == Request or P contains a valid Init Cookie option, |
671 | * (* Must scan the packet's options to check for Init | |
672 | * Cookies. Only Init Cookies are processed here, | |
673 | * however; other options are processed in Step 8. This | |
674 | * scan need only be performed if the endpoint uses Init | |
675 | * Cookies *) | |
676 | * (* Generate a new socket and switch to that socket *) | |
677 | * Set S := new socket for this port pair | |
678 | * S.state = RESPOND | |
679 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
680 | * Initialize S.GAR := S.ISS | |
681 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
682 | * Continue with S.state == RESPOND | |
683 | * (* A Response packet will be generated in Step 11 *) | |
684 | * Otherwise, | |
685 | * Generate Reset(No Connection) unless P.type == Reset | |
686 | * Drop packet and return | |
7c657876 | 687 | * |
7690af3f ACM |
688 | * NOTE: the check for the packet types is done in |
689 | * dccp_rcv_state_process | |
7c657876 ACM |
690 | */ |
691 | if (sk->sk_state == DCCP_LISTEN) { | |
692 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
693 | ||
694 | if (nsk == NULL) | |
695 | goto discard; | |
696 | ||
697 | if (nsk != sk) { | |
698 | if (dccp_child_process(sk, nsk, skb)) | |
699 | goto reset; | |
700 | return 0; | |
701 | } | |
702 | } | |
703 | ||
704 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
705 | goto reset; | |
706 | return 0; | |
707 | ||
708 | reset: | |
cfb6eeb4 | 709 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
710 | discard: |
711 | kfree_skb(skb); | |
712 | return 0; | |
713 | } | |
714 | ||
f21e68ca ACM |
715 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
716 | ||
09dbc389 GR |
717 | /** |
718 | * dccp_invalid_packet - check for malformed packets | |
719 | * Implements RFC 4340, 8.5: Step 1: Check header basics | |
720 | * Packets that fail these checks are ignored and do not receive Resets. | |
721 | */ | |
f21e68ca | 722 | int dccp_invalid_packet(struct sk_buff *skb) |
7c657876 ACM |
723 | { |
724 | const struct dccp_hdr *dh; | |
6f4e5fff | 725 | unsigned int cscov; |
7c657876 ACM |
726 | |
727 | if (skb->pkt_type != PACKET_HOST) | |
728 | return 1; | |
729 | ||
09dbc389 | 730 | /* If the packet is shorter than 12 bytes, drop packet and return */ |
7c657876 | 731 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { |
59348b19 | 732 | DCCP_WARN("pskb_may_pull failed\n"); |
7c657876 ACM |
733 | return 1; |
734 | } | |
735 | ||
736 | dh = dccp_hdr(skb); | |
737 | ||
09dbc389 | 738 | /* If P.type is not understood, drop packet and return */ |
7c657876 | 739 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
59348b19 | 740 | DCCP_WARN("invalid packet type\n"); |
7c657876 ACM |
741 | return 1; |
742 | } | |
743 | ||
744 | /* | |
09dbc389 | 745 | * If P.Data Offset is too small for packet type, drop packet and return |
7c657876 ACM |
746 | */ |
747 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
59348b19 | 748 | DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff); |
7c657876 ACM |
749 | return 1; |
750 | } | |
09dbc389 GR |
751 | /* |
752 | * If P.Data Offset is too too large for packet, drop packet and return | |
753 | */ | |
7c657876 | 754 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
59348b19 | 755 | DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff); |
7c657876 ACM |
756 | return 1; |
757 | } | |
758 | ||
7c657876 ACM |
759 | /* |
760 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
761 | * has short sequence numbers), drop packet and return | |
762 | */ | |
6079a463 WY |
763 | if ((dh->dccph_type < DCCP_PKT_DATA || |
764 | dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0) { | |
59348b19 GR |
765 | DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n", |
766 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
767 | return 1; |
768 | } | |
769 | ||
6f4e5fff GR |
770 | /* |
771 | * If P.CsCov is too large for the packet size, drop packet and return. | |
772 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
773 | */ | |
774 | cscov = dccp_csum_coverage(skb); | |
775 | if (cscov > skb->len) { | |
59348b19 GR |
776 | DCCP_WARN("P.CsCov %u exceeds packet length %d\n", |
777 | dh->dccph_cscov, skb->len); | |
6f4e5fff GR |
778 | return 1; |
779 | } | |
780 | ||
781 | /* If header checksum is incorrect, drop packet and return. | |
782 | * (This step is completed in the AF-dependent functions.) */ | |
783 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
784 | ||
7c657876 ACM |
785 | return 0; |
786 | } | |
787 | ||
f21e68ca ACM |
788 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
789 | ||
7c657876 | 790 | /* this is called when real data arrives */ |
b61fafc4 | 791 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
792 | { |
793 | const struct dccp_hdr *dh; | |
eddc9ec5 | 794 | const struct iphdr *iph; |
7c657876 | 795 | struct sock *sk; |
6f4e5fff | 796 | int min_cov; |
7c657876 | 797 | |
6f4e5fff | 798 | /* Step 1: Check header basics */ |
7c657876 ACM |
799 | |
800 | if (dccp_invalid_packet(skb)) | |
801 | goto discard_it; | |
802 | ||
eddc9ec5 | 803 | iph = ip_hdr(skb); |
6f4e5fff | 804 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
eddc9ec5 | 805 | if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) { |
59348b19 | 806 | DCCP_WARN("dropped packet with invalid checksum\n"); |
f21e68ca ACM |
807 | goto discard_it; |
808 | } | |
809 | ||
7c657876 | 810 | dh = dccp_hdr(skb); |
7c657876 | 811 | |
fde20105 | 812 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
7c657876 ACM |
813 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
814 | ||
21454aaa | 815 | dccp_pr_debug("%8.8s src=%pI4@%-5d dst=%pI4@%-5d seq=%llu", |
7c657876 | 816 | dccp_packet_name(dh->dccph_type), |
21454aaa HH |
817 | &iph->saddr, ntohs(dh->dccph_sport), |
818 | &iph->daddr, ntohs(dh->dccph_dport), | |
f6ccf554 | 819 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
820 | |
821 | if (dccp_packet_without_ack(skb)) { | |
822 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
823 | dccp_pr_debug_cat("\n"); | |
824 | } else { | |
825 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 826 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 827 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
828 | } |
829 | ||
830 | /* Step 2: | |
8109b02b | 831 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
832 | sk = __inet_lookup_skb(&dccp_hashinfo, skb, |
833 | dh->dccph_sport, dh->dccph_dport); | |
8109b02b | 834 | /* |
7c657876 | 835 | * Step 2: |
8109b02b | 836 | * If no socket ... |
7c657876 ACM |
837 | */ |
838 | if (sk == NULL) { | |
839 | dccp_pr_debug("failed to look up flow ID in table and " | |
840 | "get corresponding socket\n"); | |
841 | goto no_dccp_socket; | |
842 | } | |
843 | ||
8109b02b | 844 | /* |
7c657876 | 845 | * Step 2: |
8109b02b | 846 | * ... or S.state == TIMEWAIT, |
7c657876 ACM |
847 | * Generate Reset(No Connection) unless P.type == Reset |
848 | * Drop packet and return | |
849 | */ | |
7c657876 | 850 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
851 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
852 | inet_twsk_put(inet_twsk(sk)); | |
853 | goto no_dccp_socket; | |
7c657876 ACM |
854 | } |
855 | ||
6f4e5fff GR |
856 | /* |
857 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
858 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
859 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
860 | */ |
861 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
862 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
863 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
864 | dh->dccph_cscov, min_cov); | |
865 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
866 | * options (Section 11.7) with Drop Code 0, Protocol | |
867 | * Constraints." */ | |
868 | goto discard_and_relse; | |
869 | } | |
870 | ||
25995ff5 | 871 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 872 | goto discard_and_relse; |
eb9c7ebe | 873 | nf_reset(skb); |
7c657876 | 874 | |
58a5a7b9 | 875 | return sk_receive_skb(sk, skb, 1); |
7c657876 ACM |
876 | |
877 | no_dccp_socket: | |
878 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
879 | goto discard_it; | |
880 | /* | |
881 | * Step 2: | |
8109b02b | 882 | * If no socket ... |
7c657876 ACM |
883 | * Generate Reset(No Connection) unless P.type == Reset |
884 | * Drop packet and return | |
885 | */ | |
886 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
887 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
888 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 889 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
890 | } |
891 | ||
892 | discard_it: | |
7c657876 ACM |
893 | kfree_skb(skb); |
894 | return 0; | |
895 | ||
896 | discard_and_relse: | |
897 | sock_put(sk); | |
898 | goto discard_it; | |
899 | } | |
900 | ||
3b401a81 | 901 | static const struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
902 | .queue_xmit = ip_queue_xmit, |
903 | .send_check = dccp_v4_send_check, | |
904 | .rebuild_header = inet_sk_rebuild_header, | |
905 | .conn_request = dccp_v4_conn_request, | |
906 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
907 | .net_header_len = sizeof(struct iphdr), | |
908 | .setsockopt = ip_setsockopt, | |
909 | .getsockopt = ip_getsockopt, | |
910 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
911 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 912 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 913 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
914 | .compat_setsockopt = compat_ip_setsockopt, |
915 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 916 | #endif |
57cca05a ACM |
917 | }; |
918 | ||
3e0fadc5 | 919 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 920 | { |
72478873 ACM |
921 | static __u8 dccp_v4_ctl_sock_initialized; |
922 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 923 | |
72478873 ACM |
924 | if (err == 0) { |
925 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
926 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 927 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
928 | } |
929 | ||
3e0fadc5 | 930 | return err; |
7c657876 ACM |
931 | } |
932 | ||
6d6ee43e ACM |
933 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
934 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
935 | }; | |
936 | ||
5e0817f8 | 937 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
938 | .name = "DCCP", |
939 | .owner = THIS_MODULE, | |
940 | .close = dccp_close, | |
941 | .connect = dccp_v4_connect, | |
942 | .disconnect = dccp_disconnect, | |
943 | .ioctl = dccp_ioctl, | |
944 | .init = dccp_v4_init_sock, | |
945 | .setsockopt = dccp_setsockopt, | |
946 | .getsockopt = dccp_getsockopt, | |
947 | .sendmsg = dccp_sendmsg, | |
948 | .recvmsg = dccp_recvmsg, | |
949 | .backlog_rcv = dccp_v4_do_rcv, | |
ab1e0a13 ACM |
950 | .hash = inet_hash, |
951 | .unhash = inet_unhash, | |
7c657876 | 952 | .accept = inet_csk_accept, |
ab1e0a13 | 953 | .get_port = inet_csk_get_port, |
7c657876 | 954 | .shutdown = dccp_shutdown, |
3e0fadc5 | 955 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
956 | .orphan_count = &dccp_orphan_count, |
957 | .max_header = MAX_DCCP_HEADER, | |
958 | .obj_size = sizeof(struct dccp_sock), | |
3ab5aee7 | 959 | .slab_flags = SLAB_DESTROY_BY_RCU, |
7c657876 | 960 | .rsk_prot = &dccp_request_sock_ops, |
6d6ee43e | 961 | .twsk_prot = &dccp_timewait_sock_ops, |
39d8cda7 | 962 | .h.hashinfo = &dccp_hashinfo, |
543d9cfe ACM |
963 | #ifdef CONFIG_COMPAT |
964 | .compat_setsockopt = compat_dccp_setsockopt, | |
965 | .compat_getsockopt = compat_dccp_getsockopt, | |
966 | #endif | |
7c657876 | 967 | }; |
6d6ee43e | 968 | |
32613090 | 969 | static const struct net_protocol dccp_v4_protocol = { |
b61fafc4 ACM |
970 | .handler = dccp_v4_rcv, |
971 | .err_handler = dccp_v4_err, | |
972 | .no_policy = 1, | |
fc5f8580 | 973 | .netns_ok = 1, |
b61fafc4 ACM |
974 | }; |
975 | ||
976 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
977 | .family = PF_INET, |
978 | .owner = THIS_MODULE, | |
979 | .release = inet_release, | |
980 | .bind = inet_bind, | |
981 | .connect = inet_stream_connect, | |
982 | .socketpair = sock_no_socketpair, | |
983 | .accept = inet_accept, | |
984 | .getname = inet_getname, | |
b61fafc4 | 985 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
986 | .poll = dccp_poll, |
987 | .ioctl = inet_ioctl, | |
b61fafc4 | 988 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
989 | .listen = inet_dccp_listen, |
990 | .shutdown = inet_shutdown, | |
991 | .setsockopt = sock_common_setsockopt, | |
992 | .getsockopt = sock_common_getsockopt, | |
993 | .sendmsg = inet_sendmsg, | |
994 | .recvmsg = sock_common_recvmsg, | |
995 | .mmap = sock_no_mmap, | |
996 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 997 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
998 | .compat_setsockopt = compat_sock_common_setsockopt, |
999 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 1000 | #endif |
b61fafc4 ACM |
1001 | }; |
1002 | ||
1003 | static struct inet_protosw dccp_v4_protosw = { | |
1004 | .type = SOCK_DCCP, | |
1005 | .protocol = IPPROTO_DCCP, | |
1006 | .prot = &dccp_v4_prot, | |
1007 | .ops = &inet_dccp_ops, | |
b61fafc4 ACM |
1008 | .no_check = 0, |
1009 | .flags = INET_PROTOSW_ICSK, | |
1010 | }; | |
1011 | ||
2c8c1e72 | 1012 | static int __net_init dccp_v4_init_net(struct net *net) |
72a2d613 | 1013 | { |
d14a0ebd GR |
1014 | if (dccp_hashinfo.bhash == NULL) |
1015 | return -ESOCKTNOSUPPORT; | |
b76c4b27 | 1016 | |
d14a0ebd GR |
1017 | return inet_ctl_sock_create(&net->dccp.v4_ctl_sk, PF_INET, |
1018 | SOCK_DCCP, IPPROTO_DCCP, net); | |
72a2d613 PE |
1019 | } |
1020 | ||
2c8c1e72 | 1021 | static void __net_exit dccp_v4_exit_net(struct net *net) |
72a2d613 | 1022 | { |
b76c4b27 | 1023 | inet_ctl_sock_destroy(net->dccp.v4_ctl_sk); |
72a2d613 PE |
1024 | } |
1025 | ||
1026 | static struct pernet_operations dccp_v4_ops = { | |
1027 | .init = dccp_v4_init_net, | |
1028 | .exit = dccp_v4_exit_net, | |
1029 | }; | |
1030 | ||
b61fafc4 ACM |
1031 | static int __init dccp_v4_init(void) |
1032 | { | |
1033 | int err = proto_register(&dccp_v4_prot, 1); | |
1034 | ||
1035 | if (err != 0) | |
1036 | goto out; | |
1037 | ||
1038 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1039 | if (err != 0) | |
1040 | goto out_proto_unregister; | |
1041 | ||
1042 | inet_register_protosw(&dccp_v4_protosw); | |
1043 | ||
72a2d613 PE |
1044 | err = register_pernet_subsys(&dccp_v4_ops); |
1045 | if (err) | |
1046 | goto out_destroy_ctl_sock; | |
b61fafc4 ACM |
1047 | out: |
1048 | return err; | |
72a2d613 | 1049 | out_destroy_ctl_sock: |
b61fafc4 ACM |
1050 | inet_unregister_protosw(&dccp_v4_protosw); |
1051 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1052 | out_proto_unregister: | |
1053 | proto_unregister(&dccp_v4_prot); | |
1054 | goto out; | |
1055 | } | |
1056 | ||
1057 | static void __exit dccp_v4_exit(void) | |
1058 | { | |
72a2d613 | 1059 | unregister_pernet_subsys(&dccp_v4_ops); |
b61fafc4 ACM |
1060 | inet_unregister_protosw(&dccp_v4_protosw); |
1061 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1062 | proto_unregister(&dccp_v4_prot); | |
1063 | } | |
1064 | ||
1065 | module_init(dccp_v4_init); | |
1066 | module_exit(dccp_v4_exit); | |
1067 | ||
1068 | /* | |
1069 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1070 | * values directly, Also cover the case where the protocol is not specified, | |
1071 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1072 | */ | |
7131c6c7 JD |
1073 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 33, 6); |
1074 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 0, 6); | |
b61fafc4 ACM |
1075 | MODULE_LICENSE("GPL"); |
1076 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1077 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |