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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> | |
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 ACM |
42 | { |
43 | struct inet_sock *inet = inet_sk(sk); | |
44 | struct dccp_sock *dp = dccp_sk(sk); | |
45 | const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; | |
46 | struct rtable *rt; | |
bada8adc | 47 | __be32 daddr, nexthop; |
7c657876 ACM |
48 | int tmp; |
49 | int err; | |
50 | ||
51 | dp->dccps_role = DCCP_ROLE_CLIENT; | |
52 | ||
53 | if (addr_len < sizeof(struct sockaddr_in)) | |
54 | return -EINVAL; | |
55 | ||
56 | if (usin->sin_family != AF_INET) | |
57 | return -EAFNOSUPPORT; | |
58 | ||
59 | nexthop = daddr = usin->sin_addr.s_addr; | |
60 | if (inet->opt != NULL && inet->opt->srr) { | |
61 | if (daddr == 0) | |
62 | return -EINVAL; | |
63 | nexthop = inet->opt->faddr; | |
64 | } | |
65 | ||
c720c7e8 | 66 | tmp = ip_route_connect(&rt, nexthop, inet->inet_saddr, |
7c657876 ACM |
67 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
68 | IPPROTO_DCCP, | |
c720c7e8 | 69 | inet->inet_sport, usin->sin_port, sk, 1); |
7c657876 ACM |
70 | if (tmp < 0) |
71 | return tmp; | |
72 | ||
73 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
74 | ip_rt_put(rt); | |
75 | return -ENETUNREACH; | |
76 | } | |
77 | ||
78 | if (inet->opt == NULL || !inet->opt->srr) | |
79 | daddr = rt->rt_dst; | |
80 | ||
c720c7e8 ED |
81 | if (inet->inet_saddr == 0) |
82 | inet->inet_saddr = rt->rt_src; | |
83 | inet->inet_rcv_saddr = inet->inet_saddr; | |
7c657876 | 84 | |
c720c7e8 ED |
85 | inet->inet_dport = usin->sin_port; |
86 | inet->inet_daddr = daddr; | |
7c657876 | 87 | |
d83d8461 | 88 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
7c657876 | 89 | if (inet->opt != NULL) |
d83d8461 | 90 | inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen; |
7c657876 ACM |
91 | /* |
92 | * Socket identity is still unknown (sport may be zero). | |
93 | * However we set state to DCCP_REQUESTING and not releasing socket | |
94 | * lock select source port, enter ourselves into the hash tables and | |
95 | * complete initialization after this. | |
96 | */ | |
97 | dccp_set_state(sk, DCCP_REQUESTING); | |
a7f5e7f1 | 98 | err = inet_hash_connect(&dccp_death_row, sk); |
7c657876 ACM |
99 | if (err != 0) |
100 | goto failure; | |
101 | ||
c720c7e8 ED |
102 | err = ip_route_newports(&rt, IPPROTO_DCCP, inet->inet_sport, |
103 | inet->inet_dport, sk); | |
7c657876 ACM |
104 | if (err != 0) |
105 | goto failure; | |
106 | ||
107 | /* OK, now commit destination to socket. */ | |
d8d1f30b | 108 | sk_setup_caps(sk, &rt->dst); |
7c657876 | 109 | |
c720c7e8 ED |
110 | dp->dccps_iss = secure_dccp_sequence_number(inet->inet_saddr, |
111 | inet->inet_daddr, | |
112 | inet->inet_sport, | |
113 | inet->inet_dport); | |
114 | inet->inet_id = dp->dccps_iss ^ jiffies; | |
7c657876 ACM |
115 | |
116 | err = dccp_connect(sk); | |
117 | rt = NULL; | |
118 | if (err != 0) | |
119 | goto failure; | |
120 | out: | |
121 | return err; | |
122 | failure: | |
7690af3f ACM |
123 | /* |
124 | * This unhashes the socket and releases the local port, if necessary. | |
125 | */ | |
7c657876 ACM |
126 | dccp_set_state(sk, DCCP_CLOSED); |
127 | ip_rt_put(rt); | |
128 | sk->sk_route_caps = 0; | |
c720c7e8 | 129 | inet->inet_dport = 0; |
7c657876 ACM |
130 | goto out; |
131 | } | |
132 | ||
f21e68ca ACM |
133 | EXPORT_SYMBOL_GPL(dccp_v4_connect); |
134 | ||
7c657876 ACM |
135 | /* |
136 | * This routine does path mtu discovery as defined in RFC1191. | |
137 | */ | |
138 | static inline void dccp_do_pmtu_discovery(struct sock *sk, | |
139 | const struct iphdr *iph, | |
140 | u32 mtu) | |
141 | { | |
142 | struct dst_entry *dst; | |
143 | const struct inet_sock *inet = inet_sk(sk); | |
144 | const struct dccp_sock *dp = dccp_sk(sk); | |
145 | ||
146 | /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs | |
147 | * send out by Linux are always < 576bytes so they should go through | |
148 | * unfragmented). | |
149 | */ | |
150 | if (sk->sk_state == DCCP_LISTEN) | |
151 | return; | |
152 | ||
153 | /* We don't check in the destentry if pmtu discovery is forbidden | |
154 | * on this route. We just assume that no packet_to_big packets | |
155 | * are send back when pmtu discovery is not active. | |
c9eaf173 | 156 | * There is a small race when the user changes this flag in the |
7c657876 ACM |
157 | * route, but I think that's acceptable. |
158 | */ | |
159 | if ((dst = __sk_dst_check(sk, 0)) == NULL) | |
160 | return; | |
161 | ||
162 | dst->ops->update_pmtu(dst, mtu); | |
163 | ||
164 | /* Something is about to be wrong... Remember soft error | |
165 | * for the case, if this connection will not able to recover. | |
166 | */ | |
167 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
168 | sk->sk_err_soft = EMSGSIZE; | |
169 | ||
170 | mtu = dst_mtu(dst); | |
171 | ||
172 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
d83d8461 | 173 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
7c657876 ACM |
174 | dccp_sync_mss(sk, mtu); |
175 | ||
176 | /* | |
0e64e94e | 177 | * From RFC 4340, sec. 14.1: |
7c657876 | 178 | * |
7690af3f ACM |
179 | * DCCP-Sync packets are the best choice for upward |
180 | * probing, since DCCP-Sync probes do not risk application | |
181 | * data loss. | |
7c657876 | 182 | */ |
e92ae93a | 183 | dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC); |
7c657876 ACM |
184 | } /* else let the usual retransmit timer handle it */ |
185 | } | |
186 | ||
7c657876 ACM |
187 | /* |
188 | * This routine is called by the ICMP module when it gets some sort of error | |
189 | * condition. If err < 0 then the socket should be closed and the error | |
190 | * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code. | |
191 | * After adjustment header points to the first 8 bytes of the tcp header. We | |
192 | * need to find the appropriate port. | |
193 | * | |
194 | * The locking strategy used here is very "optimistic". When someone else | |
195 | * accesses the socket the ICMP is just dropped and for some paths there is no | |
196 | * check at all. A more general error queue to queue errors for later handling | |
197 | * is probably better. | |
198 | */ | |
b61fafc4 | 199 | static void dccp_v4_err(struct sk_buff *skb, u32 info) |
7c657876 ACM |
200 | { |
201 | const struct iphdr *iph = (struct iphdr *)skb->data; | |
18e1d836 WY |
202 | const u8 offset = iph->ihl << 2; |
203 | const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset); | |
7c657876 ACM |
204 | struct dccp_sock *dp; |
205 | struct inet_sock *inet; | |
88c7664f ACM |
206 | const int type = icmp_hdr(skb)->type; |
207 | const int code = icmp_hdr(skb)->code; | |
7c657876 ACM |
208 | struct sock *sk; |
209 | __u64 seq; | |
210 | int err; | |
fd54d716 | 211 | struct net *net = dev_net(skb->dev); |
7c657876 | 212 | |
18e1d836 WY |
213 | if (skb->len < offset + sizeof(*dh) || |
214 | skb->len < offset + __dccp_basic_hdr_len(dh)) { | |
dcfc23ca | 215 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
216 | return; |
217 | } | |
218 | ||
fd54d716 | 219 | sk = inet_lookup(net, &dccp_hashinfo, |
b9901a84 PE |
220 | iph->daddr, dh->dccph_dport, |
221 | iph->saddr, dh->dccph_sport, inet_iif(skb)); | |
7c657876 | 222 | if (sk == NULL) { |
dcfc23ca | 223 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
7c657876 ACM |
224 | return; |
225 | } | |
226 | ||
227 | if (sk->sk_state == DCCP_TIME_WAIT) { | |
9469c7b4 | 228 | inet_twsk_put(inet_twsk(sk)); |
7c657876 ACM |
229 | return; |
230 | } | |
231 | ||
232 | bh_lock_sock(sk); | |
233 | /* If too many ICMPs get dropped on busy | |
234 | * servers this needs to be solved differently. | |
235 | */ | |
236 | if (sock_owned_by_user(sk)) | |
de0744af | 237 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
7c657876 ACM |
238 | |
239 | if (sk->sk_state == DCCP_CLOSED) | |
240 | goto out; | |
241 | ||
242 | dp = dccp_sk(sk); | |
fde20105 | 243 | seq = dccp_hdr_seq(dh); |
1238d087 | 244 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
d68f0866 | 245 | !between48(seq, dp->dccps_awl, dp->dccps_awh)) { |
de0744af | 246 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
247 | goto out; |
248 | } | |
249 | ||
250 | switch (type) { | |
251 | case ICMP_SOURCE_QUENCH: | |
252 | /* Just silently ignore these. */ | |
253 | goto out; | |
254 | case ICMP_PARAMETERPROB: | |
255 | err = EPROTO; | |
256 | break; | |
257 | case ICMP_DEST_UNREACH: | |
258 | if (code > NR_ICMP_UNREACH) | |
259 | goto out; | |
260 | ||
261 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
262 | if (!sock_owned_by_user(sk)) | |
263 | dccp_do_pmtu_discovery(sk, iph, info); | |
264 | goto out; | |
265 | } | |
266 | ||
267 | err = icmp_err_convert[code].errno; | |
268 | break; | |
269 | case ICMP_TIME_EXCEEDED: | |
270 | err = EHOSTUNREACH; | |
271 | break; | |
272 | default: | |
273 | goto out; | |
274 | } | |
275 | ||
276 | switch (sk->sk_state) { | |
277 | struct request_sock *req , **prev; | |
278 | case DCCP_LISTEN: | |
279 | if (sock_owned_by_user(sk)) | |
280 | goto out; | |
281 | req = inet_csk_search_req(sk, &prev, dh->dccph_dport, | |
282 | iph->daddr, iph->saddr); | |
283 | if (!req) | |
284 | goto out; | |
285 | ||
286 | /* | |
287 | * ICMPs are not backlogged, hence we cannot get an established | |
288 | * socket here. | |
289 | */ | |
547b792c | 290 | WARN_ON(req->sk); |
7c657876 ACM |
291 | |
292 | if (seq != dccp_rsk(req)->dreq_iss) { | |
de0744af | 293 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
7c657876 ACM |
294 | goto out; |
295 | } | |
296 | /* | |
297 | * Still in RESPOND, just remove it silently. | |
298 | * There is no good way to pass the error to the newly | |
299 | * created socket, and POSIX does not want network | |
300 | * errors returned from accept(). | |
301 | */ | |
302 | inet_csk_reqsk_queue_drop(sk, req, prev); | |
303 | goto out; | |
304 | ||
305 | case DCCP_REQUESTING: | |
306 | case DCCP_RESPOND: | |
307 | if (!sock_owned_by_user(sk)) { | |
308 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
309 | sk->sk_err = err; | |
310 | ||
311 | sk->sk_error_report(sk); | |
312 | ||
313 | dccp_done(sk); | |
314 | } else | |
315 | sk->sk_err_soft = err; | |
316 | goto out; | |
317 | } | |
318 | ||
319 | /* If we've already connected we will keep trying | |
320 | * until we time out, or the user gives up. | |
321 | * | |
322 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
323 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
324 | * but it is obsoleted by pmtu discovery). | |
325 | * | |
326 | * Note, that in modern internet, where routing is unreliable | |
327 | * and in each dark corner broken firewalls sit, sending random | |
328 | * errors ordered by their masters even this two messages finally lose | |
329 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
330 | * | |
331 | * Now we are in compliance with RFCs. | |
332 | * --ANK (980905) | |
333 | */ | |
334 | ||
335 | inet = inet_sk(sk); | |
336 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
337 | sk->sk_err = err; | |
338 | sk->sk_error_report(sk); | |
339 | } else /* Only an error on timeout */ | |
340 | sk->sk_err_soft = err; | |
341 | out: | |
342 | bh_unlock_sock(sk); | |
343 | sock_put(sk); | |
344 | } | |
345 | ||
2bda2853 | 346 | static inline __sum16 dccp_v4_csum_finish(struct sk_buff *skb, |
6f4e5fff GR |
347 | __be32 src, __be32 dst) |
348 | { | |
349 | return csum_tcpudp_magic(src, dst, skb->len, IPPROTO_DCCP, skb->csum); | |
350 | } | |
351 | ||
bb296246 | 352 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
57cca05a ACM |
353 | { |
354 | const struct inet_sock *inet = inet_sk(sk); | |
355 | struct dccp_hdr *dh = dccp_hdr(skb); | |
356 | ||
6f4e5fff | 357 | dccp_csum_outgoing(skb); |
c720c7e8 ED |
358 | dh->dccph_checksum = dccp_v4_csum_finish(skb, |
359 | inet->inet_saddr, | |
360 | inet->inet_daddr); | |
57cca05a ACM |
361 | } |
362 | ||
f21e68ca ACM |
363 | EXPORT_SYMBOL_GPL(dccp_v4_send_check); |
364 | ||
865e9022 | 365 | static inline u64 dccp_v4_init_sequence(const struct sk_buff *skb) |
7c657876 | 366 | { |
eddc9ec5 ACM |
367 | return secure_dccp_sequence_number(ip_hdr(skb)->daddr, |
368 | ip_hdr(skb)->saddr, | |
7c657876 ACM |
369 | dccp_hdr(skb)->dccph_dport, |
370 | dccp_hdr(skb)->dccph_sport); | |
371 | } | |
372 | ||
7c657876 ACM |
373 | /* |
374 | * The three way handshake has completed - we got a valid ACK or DATAACK - | |
375 | * now create the new socket. | |
376 | * | |
377 | * This is the equivalent of TCP's tcp_v4_syn_recv_sock | |
378 | */ | |
379 | struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, | |
380 | struct request_sock *req, | |
381 | struct dst_entry *dst) | |
382 | { | |
383 | struct inet_request_sock *ireq; | |
384 | struct inet_sock *newinet; | |
7c657876 ACM |
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) | |
093d2823 | 395 | goto exit_nonewsk; |
7c657876 ACM |
396 | |
397 | sk_setup_caps(newsk, dst); | |
398 | ||
7c657876 ACM |
399 | newinet = inet_sk(newsk); |
400 | ireq = inet_rsk(req); | |
c720c7e8 ED |
401 | newinet->inet_daddr = ireq->rmt_addr; |
402 | newinet->inet_rcv_saddr = ireq->loc_addr; | |
403 | newinet->inet_saddr = ireq->loc_addr; | |
7c657876 ACM |
404 | newinet->opt = ireq->opt; |
405 | ireq->opt = NULL; | |
406 | newinet->mc_index = inet_iif(skb); | |
eddc9ec5 | 407 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
c720c7e8 | 408 | newinet->inet_id = jiffies; |
7c657876 ACM |
409 | |
410 | dccp_sync_mss(newsk, dst_mtu(dst)); | |
411 | ||
093d2823 BS |
412 | if (__inet_inherit_port(sk, newsk) < 0) { |
413 | sock_put(newsk); | |
414 | goto exit; | |
415 | } | |
9327f705 | 416 | __inet_hash_nolisten(newsk, NULL); |
7c657876 ACM |
417 | |
418 | return newsk; | |
419 | ||
420 | exit_overflow: | |
de0744af | 421 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
422 | exit_nonewsk: |
423 | dst_release(dst); | |
7c657876 | 424 | exit: |
de0744af | 425 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
7c657876 ACM |
426 | return NULL; |
427 | } | |
428 | ||
f21e68ca ACM |
429 | EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock); |
430 | ||
7c657876 ACM |
431 | static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) |
432 | { | |
433 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
eddc9ec5 | 434 | const struct iphdr *iph = ip_hdr(skb); |
7c657876 ACM |
435 | struct sock *nsk; |
436 | struct request_sock **prev; | |
437 | /* Find possible connection requests. */ | |
438 | struct request_sock *req = inet_csk_search_req(sk, &prev, | |
439 | dh->dccph_sport, | |
440 | iph->saddr, iph->daddr); | |
441 | if (req != NULL) | |
442 | return dccp_check_req(sk, skb, req, prev); | |
443 | ||
b9901a84 | 444 | nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo, |
8f491069 HX |
445 | iph->saddr, dh->dccph_sport, |
446 | iph->daddr, dh->dccph_dport, | |
447 | inet_iif(skb)); | |
7c657876 ACM |
448 | if (nsk != NULL) { |
449 | if (nsk->sk_state != DCCP_TIME_WAIT) { | |
450 | bh_lock_sock(nsk); | |
451 | return nsk; | |
452 | } | |
9469c7b4 | 453 | inet_twsk_put(inet_twsk(nsk)); |
7c657876 ACM |
454 | return NULL; |
455 | } | |
456 | ||
457 | return sk; | |
458 | } | |
459 | ||
f5487398 | 460 | static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk, |
7c657876 ACM |
461 | struct sk_buff *skb) |
462 | { | |
463 | struct rtable *rt; | |
511c3f92 | 464 | struct flowi fl = { .oif = skb_rtable(skb)->rt_iif, |
5811662b CG |
465 | .fl4_dst = ip_hdr(skb)->saddr, |
466 | .fl4_src = ip_hdr(skb)->daddr, | |
467 | .fl4_tos = RT_CONN_FLAGS(sk), | |
7c657876 | 468 | .proto = sk->sk_protocol, |
5811662b CG |
469 | .fl_ip_sport = dccp_hdr(skb)->dccph_dport, |
470 | .fl_ip_dport = dccp_hdr(skb)->dccph_sport | |
7690af3f | 471 | }; |
7c657876 | 472 | |
beb8d13b | 473 | security_skb_classify_flow(skb, &fl); |
f5487398 | 474 | if (ip_route_output_flow(net, &rt, &fl, sk, 0)) { |
7c73a6fa | 475 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
7c657876 ACM |
476 | return NULL; |
477 | } | |
478 | ||
d8d1f30b | 479 | return &rt->dst; |
7c657876 ACM |
480 | } |
481 | ||
e6b4d113 WAS |
482 | static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, |
483 | struct request_values *rv_unused) | |
3d2fe62b GR |
484 | { |
485 | int err = -1; | |
486 | struct sk_buff *skb; | |
fd80eb94 | 487 | struct dst_entry *dst; |
3d2fe62b | 488 | |
fd80eb94 DL |
489 | dst = inet_csk_route_req(sk, req); |
490 | if (dst == NULL) | |
3d2fe62b GR |
491 | goto out; |
492 | ||
493 | skb = dccp_make_response(sk, dst, req); | |
494 | if (skb != NULL) { | |
495 | const struct inet_request_sock *ireq = inet_rsk(req); | |
496 | struct dccp_hdr *dh = dccp_hdr(skb); | |
497 | ||
6f4e5fff GR |
498 | dh->dccph_checksum = dccp_v4_csum_finish(skb, ireq->loc_addr, |
499 | ireq->rmt_addr); | |
3d2fe62b GR |
500 | err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, |
501 | ireq->rmt_addr, | |
502 | ireq->opt); | |
b9df3cb8 | 503 | err = net_xmit_eval(err); |
3d2fe62b GR |
504 | } |
505 | ||
506 | out: | |
507 | dst_release(dst); | |
508 | return err; | |
509 | } | |
510 | ||
cfb6eeb4 | 511 | static void dccp_v4_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb) |
7c657876 ACM |
512 | { |
513 | int err; | |
eddc9ec5 | 514 | const struct iphdr *rxiph; |
7c657876 ACM |
515 | struct sk_buff *skb; |
516 | struct dst_entry *dst; | |
adf30907 | 517 | struct net *net = dev_net(skb_dst(rxskb)->dev); |
b76c4b27 | 518 | struct sock *ctl_sk = net->dccp.v4_ctl_sk; |
7c657876 ACM |
519 | |
520 | /* Never send a reset in response to a reset. */ | |
e356d37a | 521 | if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
7c657876 ACM |
522 | return; |
523 | ||
511c3f92 | 524 | if (skb_rtable(rxskb)->rt_type != RTN_LOCAL) |
7c657876 ACM |
525 | return; |
526 | ||
f5487398 | 527 | dst = dccp_v4_route_skb(net, ctl_sk, rxskb); |
7c657876 ACM |
528 | if (dst == NULL) |
529 | return; | |
530 | ||
7b1cffa8 | 531 | skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
7c657876 ACM |
532 | if (skb == NULL) |
533 | goto out; | |
534 | ||
eddc9ec5 | 535 | rxiph = ip_hdr(rxskb); |
e356d37a GR |
536 | dccp_hdr(skb)->dccph_checksum = dccp_v4_csum_finish(skb, rxiph->saddr, |
537 | rxiph->daddr); | |
adf30907 | 538 | skb_dst_set(skb, dst_clone(dst)); |
7c657876 | 539 | |
7b1cffa8 PE |
540 | bh_lock_sock(ctl_sk); |
541 | err = ip_build_and_send_pkt(skb, ctl_sk, | |
eddc9ec5 | 542 | rxiph->daddr, rxiph->saddr, NULL); |
7b1cffa8 | 543 | bh_unlock_sock(ctl_sk); |
7c657876 | 544 | |
b9df3cb8 | 545 | if (net_xmit_eval(err) == 0) { |
7c657876 ACM |
546 | DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS); |
547 | DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS); | |
548 | } | |
549 | out: | |
550 | dst_release(dst); | |
551 | } | |
552 | ||
3d2fe62b GR |
553 | static void dccp_v4_reqsk_destructor(struct request_sock *req) |
554 | { | |
d99a7bd2 | 555 | dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
3d2fe62b GR |
556 | kfree(inet_rsk(req)->opt); |
557 | } | |
558 | ||
559 | static struct request_sock_ops dccp_request_sock_ops __read_mostly = { | |
560 | .family = PF_INET, | |
561 | .obj_size = sizeof(struct dccp_request_sock), | |
562 | .rtx_syn_ack = dccp_v4_send_response, | |
563 | .send_ack = dccp_reqsk_send_ack, | |
564 | .destructor = dccp_v4_reqsk_destructor, | |
565 | .send_reset = dccp_v4_ctl_send_reset, | |
566 | }; | |
567 | ||
568 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) | |
569 | { | |
570 | struct inet_request_sock *ireq; | |
3d2fe62b GR |
571 | struct request_sock *req; |
572 | struct dccp_request_sock *dreq; | |
8109b02b | 573 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
3d2fe62b | 574 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
3d2fe62b GR |
575 | |
576 | /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ | |
511c3f92 | 577 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
4a5409a5 | 578 | return 0; /* discard, don't send a reset here */ |
3d2fe62b GR |
579 | |
580 | if (dccp_bad_service_code(sk, service)) { | |
4a5409a5 | 581 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
3d2fe62b | 582 | goto drop; |
8109b02b | 583 | } |
3d2fe62b GR |
584 | /* |
585 | * TW buckets are converted to open requests without | |
586 | * limitations, they conserve resources and peer is | |
587 | * evidently real one. | |
588 | */ | |
4a5409a5 | 589 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
3d2fe62b GR |
590 | if (inet_csk_reqsk_queue_is_full(sk)) |
591 | goto drop; | |
592 | ||
593 | /* | |
594 | * Accept backlog is full. If we have already queued enough | |
595 | * of warm entries in syn queue, drop request. It is better than | |
596 | * clogging syn queue with openreqs with exponentially increasing | |
597 | * timeout. | |
598 | */ | |
599 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) | |
600 | goto drop; | |
601 | ||
ce4a7d0d | 602 | req = inet_reqsk_alloc(&dccp_request_sock_ops); |
3d2fe62b GR |
603 | if (req == NULL) |
604 | goto drop; | |
605 | ||
ac75773c GR |
606 | if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
607 | goto drop_and_free; | |
3d2fe62b | 608 | |
8b819412 GR |
609 | dreq = dccp_rsk(req); |
610 | if (dccp_parse_options(sk, dreq, skb)) | |
611 | goto drop_and_free; | |
612 | ||
3d2fe62b GR |
613 | if (security_inet_conn_request(sk, skb, req)) |
614 | goto drop_and_free; | |
615 | ||
616 | ireq = inet_rsk(req); | |
eddc9ec5 ACM |
617 | ireq->loc_addr = ip_hdr(skb)->daddr; |
618 | ireq->rmt_addr = ip_hdr(skb)->saddr; | |
3d2fe62b | 619 | |
8109b02b | 620 | /* |
3d2fe62b GR |
621 | * Step 3: Process LISTEN state |
622 | * | |
623 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie | |
624 | * | |
625 | * In fact we defer setting S.GSR, S.SWL, S.SWH to | |
626 | * dccp_create_openreq_child. | |
627 | */ | |
3d2fe62b | 628 | dreq->dreq_isr = dcb->dccpd_seq; |
865e9022 | 629 | dreq->dreq_iss = dccp_v4_init_sequence(skb); |
3d2fe62b GR |
630 | dreq->dreq_service = service; |
631 | ||
e6b4d113 | 632 | if (dccp_v4_send_response(sk, req, NULL)) |
3d2fe62b GR |
633 | goto drop_and_free; |
634 | ||
635 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); | |
636 | return 0; | |
637 | ||
638 | drop_and_free: | |
639 | reqsk_free(req); | |
640 | drop: | |
641 | DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); | |
3d2fe62b GR |
642 | return -1; |
643 | } | |
644 | ||
645 | EXPORT_SYMBOL_GPL(dccp_v4_conn_request); | |
646 | ||
7c657876 ACM |
647 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) |
648 | { | |
649 | struct dccp_hdr *dh = dccp_hdr(skb); | |
650 | ||
651 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ | |
652 | if (dccp_rcv_established(sk, skb, dh, skb->len)) | |
653 | goto reset; | |
654 | return 0; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Step 3: Process LISTEN state | |
d83ca5ac GR |
659 | * If P.type == Request or P contains a valid Init Cookie option, |
660 | * (* Must scan the packet's options to check for Init | |
661 | * Cookies. Only Init Cookies are processed here, | |
662 | * however; other options are processed in Step 8. This | |
663 | * scan need only be performed if the endpoint uses Init | |
664 | * Cookies *) | |
665 | * (* Generate a new socket and switch to that socket *) | |
666 | * Set S := new socket for this port pair | |
667 | * S.state = RESPOND | |
668 | * Choose S.ISS (initial seqno) or set from Init Cookies | |
669 | * Initialize S.GAR := S.ISS | |
670 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies | |
671 | * Continue with S.state == RESPOND | |
672 | * (* A Response packet will be generated in Step 11 *) | |
673 | * Otherwise, | |
674 | * Generate Reset(No Connection) unless P.type == Reset | |
675 | * Drop packet and return | |
7c657876 | 676 | * |
7690af3f ACM |
677 | * NOTE: the check for the packet types is done in |
678 | * dccp_rcv_state_process | |
7c657876 ACM |
679 | */ |
680 | if (sk->sk_state == DCCP_LISTEN) { | |
681 | struct sock *nsk = dccp_v4_hnd_req(sk, skb); | |
682 | ||
683 | if (nsk == NULL) | |
684 | goto discard; | |
685 | ||
686 | if (nsk != sk) { | |
687 | if (dccp_child_process(sk, nsk, skb)) | |
688 | goto reset; | |
689 | return 0; | |
690 | } | |
691 | } | |
692 | ||
693 | if (dccp_rcv_state_process(sk, skb, dh, skb->len)) | |
694 | goto reset; | |
695 | return 0; | |
696 | ||
697 | reset: | |
cfb6eeb4 | 698 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
699 | discard: |
700 | kfree_skb(skb); | |
701 | return 0; | |
702 | } | |
703 | ||
f21e68ca ACM |
704 | EXPORT_SYMBOL_GPL(dccp_v4_do_rcv); |
705 | ||
09dbc389 GR |
706 | /** |
707 | * dccp_invalid_packet - check for malformed packets | |
708 | * Implements RFC 4340, 8.5: Step 1: Check header basics | |
709 | * Packets that fail these checks are ignored and do not receive Resets. | |
710 | */ | |
f21e68ca | 711 | int dccp_invalid_packet(struct sk_buff *skb) |
7c657876 ACM |
712 | { |
713 | const struct dccp_hdr *dh; | |
6f4e5fff | 714 | unsigned int cscov; |
7c657876 ACM |
715 | |
716 | if (skb->pkt_type != PACKET_HOST) | |
717 | return 1; | |
718 | ||
09dbc389 | 719 | /* If the packet is shorter than 12 bytes, drop packet and return */ |
7c657876 | 720 | if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { |
59348b19 | 721 | DCCP_WARN("pskb_may_pull failed\n"); |
7c657876 ACM |
722 | return 1; |
723 | } | |
724 | ||
725 | dh = dccp_hdr(skb); | |
726 | ||
09dbc389 | 727 | /* If P.type is not understood, drop packet and return */ |
7c657876 | 728 | if (dh->dccph_type >= DCCP_PKT_INVALID) { |
59348b19 | 729 | DCCP_WARN("invalid packet type\n"); |
7c657876 ACM |
730 | return 1; |
731 | } | |
732 | ||
733 | /* | |
09dbc389 | 734 | * If P.Data Offset is too small for packet type, drop packet and return |
7c657876 ACM |
735 | */ |
736 | if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { | |
59348b19 | 737 | DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff); |
7c657876 ACM |
738 | return 1; |
739 | } | |
09dbc389 GR |
740 | /* |
741 | * If P.Data Offset is too too large for packet, drop packet and return | |
742 | */ | |
7c657876 | 743 | if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { |
59348b19 | 744 | DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff); |
7c657876 ACM |
745 | return 1; |
746 | } | |
747 | ||
7c657876 ACM |
748 | /* |
749 | * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet | |
750 | * has short sequence numbers), drop packet and return | |
751 | */ | |
6079a463 WY |
752 | if ((dh->dccph_type < DCCP_PKT_DATA || |
753 | dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0) { | |
59348b19 GR |
754 | DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n", |
755 | dccp_packet_name(dh->dccph_type)); | |
7c657876 ACM |
756 | return 1; |
757 | } | |
758 | ||
6f4e5fff GR |
759 | /* |
760 | * If P.CsCov is too large for the packet size, drop packet and return. | |
761 | * This must come _before_ checksumming (not as RFC 4340 suggests). | |
762 | */ | |
763 | cscov = dccp_csum_coverage(skb); | |
764 | if (cscov > skb->len) { | |
59348b19 GR |
765 | DCCP_WARN("P.CsCov %u exceeds packet length %d\n", |
766 | dh->dccph_cscov, skb->len); | |
6f4e5fff GR |
767 | return 1; |
768 | } | |
769 | ||
770 | /* If header checksum is incorrect, drop packet and return. | |
771 | * (This step is completed in the AF-dependent functions.) */ | |
772 | skb->csum = skb_checksum(skb, 0, cscov, 0); | |
773 | ||
7c657876 ACM |
774 | return 0; |
775 | } | |
776 | ||
f21e68ca ACM |
777 | EXPORT_SYMBOL_GPL(dccp_invalid_packet); |
778 | ||
7c657876 | 779 | /* this is called when real data arrives */ |
b61fafc4 | 780 | static int dccp_v4_rcv(struct sk_buff *skb) |
7c657876 ACM |
781 | { |
782 | const struct dccp_hdr *dh; | |
eddc9ec5 | 783 | const struct iphdr *iph; |
7c657876 | 784 | struct sock *sk; |
6f4e5fff | 785 | int min_cov; |
7c657876 | 786 | |
6f4e5fff | 787 | /* Step 1: Check header basics */ |
7c657876 ACM |
788 | |
789 | if (dccp_invalid_packet(skb)) | |
790 | goto discard_it; | |
791 | ||
eddc9ec5 | 792 | iph = ip_hdr(skb); |
6f4e5fff | 793 | /* Step 1: If header checksum is incorrect, drop packet and return */ |
eddc9ec5 | 794 | if (dccp_v4_csum_finish(skb, iph->saddr, iph->daddr)) { |
59348b19 | 795 | DCCP_WARN("dropped packet with invalid checksum\n"); |
f21e68ca ACM |
796 | goto discard_it; |
797 | } | |
798 | ||
7c657876 | 799 | dh = dccp_hdr(skb); |
7c657876 | 800 | |
fde20105 | 801 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
7c657876 ACM |
802 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
803 | ||
21454aaa | 804 | dccp_pr_debug("%8.8s src=%pI4@%-5d dst=%pI4@%-5d seq=%llu", |
7c657876 | 805 | dccp_packet_name(dh->dccph_type), |
21454aaa HH |
806 | &iph->saddr, ntohs(dh->dccph_sport), |
807 | &iph->daddr, ntohs(dh->dccph_dport), | |
f6ccf554 | 808 | (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); |
7c657876 ACM |
809 | |
810 | if (dccp_packet_without_ack(skb)) { | |
811 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; | |
812 | dccp_pr_debug_cat("\n"); | |
813 | } else { | |
814 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); | |
d23c7107 | 815 | dccp_pr_debug_cat(", ack=%llu\n", (unsigned long long) |
f6ccf554 | 816 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
7c657876 ACM |
817 | } |
818 | ||
819 | /* Step 2: | |
8109b02b | 820 | * Look up flow ID in table and get corresponding socket */ |
9a1f27c4 ACM |
821 | sk = __inet_lookup_skb(&dccp_hashinfo, skb, |
822 | dh->dccph_sport, dh->dccph_dport); | |
8109b02b | 823 | /* |
7c657876 | 824 | * Step 2: |
8109b02b | 825 | * If no socket ... |
7c657876 ACM |
826 | */ |
827 | if (sk == NULL) { | |
828 | dccp_pr_debug("failed to look up flow ID in table and " | |
829 | "get corresponding socket\n"); | |
830 | goto no_dccp_socket; | |
831 | } | |
832 | ||
8109b02b | 833 | /* |
7c657876 | 834 | * Step 2: |
8109b02b | 835 | * ... or S.state == TIMEWAIT, |
7c657876 ACM |
836 | * Generate Reset(No Connection) unless P.type == Reset |
837 | * Drop packet and return | |
838 | */ | |
7c657876 | 839 | if (sk->sk_state == DCCP_TIME_WAIT) { |
d23c7107 GR |
840 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
841 | inet_twsk_put(inet_twsk(sk)); | |
842 | goto no_dccp_socket; | |
7c657876 ACM |
843 | } |
844 | ||
6f4e5fff GR |
845 | /* |
846 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage | |
8109b02b ACM |
847 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
848 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov | |
6f4e5fff GR |
849 | */ |
850 | min_cov = dccp_sk(sk)->dccps_pcrlen; | |
851 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { | |
852 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", | |
853 | dh->dccph_cscov, min_cov); | |
854 | /* FIXME: "Such packets SHOULD be reported using Data Dropped | |
855 | * options (Section 11.7) with Drop Code 0, Protocol | |
856 | * Constraints." */ | |
857 | goto discard_and_relse; | |
858 | } | |
859 | ||
25995ff5 | 860 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
7c657876 | 861 | goto discard_and_relse; |
eb9c7ebe | 862 | nf_reset(skb); |
7c657876 | 863 | |
58a5a7b9 | 864 | return sk_receive_skb(sk, skb, 1); |
7c657876 ACM |
865 | |
866 | no_dccp_socket: | |
867 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
868 | goto discard_it; | |
869 | /* | |
870 | * Step 2: | |
8109b02b | 871 | * If no socket ... |
7c657876 ACM |
872 | * Generate Reset(No Connection) unless P.type == Reset |
873 | * Drop packet and return | |
874 | */ | |
875 | if (dh->dccph_type != DCCP_PKT_RESET) { | |
7690af3f ACM |
876 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
877 | DCCP_RESET_CODE_NO_CONNECTION; | |
cfb6eeb4 | 878 | dccp_v4_ctl_send_reset(sk, skb); |
7c657876 ACM |
879 | } |
880 | ||
881 | discard_it: | |
7c657876 ACM |
882 | kfree_skb(skb); |
883 | return 0; | |
884 | ||
885 | discard_and_relse: | |
886 | sock_put(sk); | |
887 | goto discard_it; | |
888 | } | |
889 | ||
3b401a81 | 890 | static const struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { |
543d9cfe ACM |
891 | .queue_xmit = ip_queue_xmit, |
892 | .send_check = dccp_v4_send_check, | |
893 | .rebuild_header = inet_sk_rebuild_header, | |
894 | .conn_request = dccp_v4_conn_request, | |
895 | .syn_recv_sock = dccp_v4_request_recv_sock, | |
896 | .net_header_len = sizeof(struct iphdr), | |
897 | .setsockopt = ip_setsockopt, | |
898 | .getsockopt = ip_getsockopt, | |
899 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
900 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 901 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 902 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
903 | .compat_setsockopt = compat_ip_setsockopt, |
904 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 905 | #endif |
57cca05a ACM |
906 | }; |
907 | ||
3e0fadc5 | 908 | static int dccp_v4_init_sock(struct sock *sk) |
7c657876 | 909 | { |
72478873 ACM |
910 | static __u8 dccp_v4_ctl_sock_initialized; |
911 | int err = dccp_init_sock(sk, dccp_v4_ctl_sock_initialized); | |
f21e68ca | 912 | |
72478873 ACM |
913 | if (err == 0) { |
914 | if (unlikely(!dccp_v4_ctl_sock_initialized)) | |
915 | dccp_v4_ctl_sock_initialized = 1; | |
3e0fadc5 | 916 | inet_csk(sk)->icsk_af_ops = &dccp_ipv4_af_ops; |
72478873 ACM |
917 | } |
918 | ||
3e0fadc5 | 919 | return err; |
7c657876 ACM |
920 | } |
921 | ||
6d6ee43e ACM |
922 | static struct timewait_sock_ops dccp_timewait_sock_ops = { |
923 | .twsk_obj_size = sizeof(struct inet_timewait_sock), | |
924 | }; | |
925 | ||
5e0817f8 | 926 | static struct proto dccp_v4_prot = { |
7c657876 ACM |
927 | .name = "DCCP", |
928 | .owner = THIS_MODULE, | |
929 | .close = dccp_close, | |
930 | .connect = dccp_v4_connect, | |
931 | .disconnect = dccp_disconnect, | |
932 | .ioctl = dccp_ioctl, | |
933 | .init = dccp_v4_init_sock, | |
934 | .setsockopt = dccp_setsockopt, | |
935 | .getsockopt = dccp_getsockopt, | |
936 | .sendmsg = dccp_sendmsg, | |
937 | .recvmsg = dccp_recvmsg, | |
938 | .backlog_rcv = dccp_v4_do_rcv, | |
ab1e0a13 ACM |
939 | .hash = inet_hash, |
940 | .unhash = inet_unhash, | |
7c657876 | 941 | .accept = inet_csk_accept, |
ab1e0a13 | 942 | .get_port = inet_csk_get_port, |
7c657876 | 943 | .shutdown = dccp_shutdown, |
3e0fadc5 | 944 | .destroy = dccp_destroy_sock, |
7c657876 ACM |
945 | .orphan_count = &dccp_orphan_count, |
946 | .max_header = MAX_DCCP_HEADER, | |
947 | .obj_size = sizeof(struct dccp_sock), | |
3ab5aee7 | 948 | .slab_flags = SLAB_DESTROY_BY_RCU, |
7c657876 | 949 | .rsk_prot = &dccp_request_sock_ops, |
6d6ee43e | 950 | .twsk_prot = &dccp_timewait_sock_ops, |
39d8cda7 | 951 | .h.hashinfo = &dccp_hashinfo, |
543d9cfe ACM |
952 | #ifdef CONFIG_COMPAT |
953 | .compat_setsockopt = compat_dccp_setsockopt, | |
954 | .compat_getsockopt = compat_dccp_getsockopt, | |
955 | #endif | |
7c657876 | 956 | }; |
6d6ee43e | 957 | |
32613090 | 958 | static const struct net_protocol dccp_v4_protocol = { |
b61fafc4 ACM |
959 | .handler = dccp_v4_rcv, |
960 | .err_handler = dccp_v4_err, | |
961 | .no_policy = 1, | |
fc5f8580 | 962 | .netns_ok = 1, |
b61fafc4 ACM |
963 | }; |
964 | ||
965 | static const struct proto_ops inet_dccp_ops = { | |
543d9cfe ACM |
966 | .family = PF_INET, |
967 | .owner = THIS_MODULE, | |
968 | .release = inet_release, | |
969 | .bind = inet_bind, | |
970 | .connect = inet_stream_connect, | |
971 | .socketpair = sock_no_socketpair, | |
972 | .accept = inet_accept, | |
973 | .getname = inet_getname, | |
b61fafc4 | 974 | /* FIXME: work on tcp_poll to rename it to inet_csk_poll */ |
543d9cfe ACM |
975 | .poll = dccp_poll, |
976 | .ioctl = inet_ioctl, | |
b61fafc4 | 977 | /* FIXME: work on inet_listen to rename it to sock_common_listen */ |
543d9cfe ACM |
978 | .listen = inet_dccp_listen, |
979 | .shutdown = inet_shutdown, | |
980 | .setsockopt = sock_common_setsockopt, | |
981 | .getsockopt = sock_common_getsockopt, | |
982 | .sendmsg = inet_sendmsg, | |
983 | .recvmsg = sock_common_recvmsg, | |
984 | .mmap = sock_no_mmap, | |
985 | .sendpage = sock_no_sendpage, | |
3fdadf7d | 986 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
987 | .compat_setsockopt = compat_sock_common_setsockopt, |
988 | .compat_getsockopt = compat_sock_common_getsockopt, | |
3fdadf7d | 989 | #endif |
b61fafc4 ACM |
990 | }; |
991 | ||
992 | static struct inet_protosw dccp_v4_protosw = { | |
993 | .type = SOCK_DCCP, | |
994 | .protocol = IPPROTO_DCCP, | |
995 | .prot = &dccp_v4_prot, | |
996 | .ops = &inet_dccp_ops, | |
b61fafc4 ACM |
997 | .no_check = 0, |
998 | .flags = INET_PROTOSW_ICSK, | |
999 | }; | |
1000 | ||
2c8c1e72 | 1001 | static int __net_init dccp_v4_init_net(struct net *net) |
72a2d613 | 1002 | { |
d14a0ebd GR |
1003 | if (dccp_hashinfo.bhash == NULL) |
1004 | return -ESOCKTNOSUPPORT; | |
b76c4b27 | 1005 | |
d14a0ebd GR |
1006 | return inet_ctl_sock_create(&net->dccp.v4_ctl_sk, PF_INET, |
1007 | SOCK_DCCP, IPPROTO_DCCP, net); | |
72a2d613 PE |
1008 | } |
1009 | ||
2c8c1e72 | 1010 | static void __net_exit dccp_v4_exit_net(struct net *net) |
72a2d613 | 1011 | { |
b76c4b27 | 1012 | inet_ctl_sock_destroy(net->dccp.v4_ctl_sk); |
72a2d613 PE |
1013 | } |
1014 | ||
1015 | static struct pernet_operations dccp_v4_ops = { | |
1016 | .init = dccp_v4_init_net, | |
1017 | .exit = dccp_v4_exit_net, | |
1018 | }; | |
1019 | ||
b61fafc4 ACM |
1020 | static int __init dccp_v4_init(void) |
1021 | { | |
1022 | int err = proto_register(&dccp_v4_prot, 1); | |
1023 | ||
1024 | if (err != 0) | |
1025 | goto out; | |
1026 | ||
1027 | err = inet_add_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1028 | if (err != 0) | |
1029 | goto out_proto_unregister; | |
1030 | ||
1031 | inet_register_protosw(&dccp_v4_protosw); | |
1032 | ||
72a2d613 PE |
1033 | err = register_pernet_subsys(&dccp_v4_ops); |
1034 | if (err) | |
1035 | goto out_destroy_ctl_sock; | |
b61fafc4 ACM |
1036 | out: |
1037 | return err; | |
72a2d613 | 1038 | out_destroy_ctl_sock: |
b61fafc4 ACM |
1039 | inet_unregister_protosw(&dccp_v4_protosw); |
1040 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1041 | out_proto_unregister: | |
1042 | proto_unregister(&dccp_v4_prot); | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | static void __exit dccp_v4_exit(void) | |
1047 | { | |
72a2d613 | 1048 | unregister_pernet_subsys(&dccp_v4_ops); |
b61fafc4 ACM |
1049 | inet_unregister_protosw(&dccp_v4_protosw); |
1050 | inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP); | |
1051 | proto_unregister(&dccp_v4_prot); | |
1052 | } | |
1053 | ||
1054 | module_init(dccp_v4_init); | |
1055 | module_exit(dccp_v4_exit); | |
1056 | ||
1057 | /* | |
1058 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) | |
1059 | * values directly, Also cover the case where the protocol is not specified, | |
1060 | * i.e. net-pf-PF_INET-proto-0-type-SOCK_DCCP | |
1061 | */ | |
7131c6c7 JD |
1062 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 33, 6); |
1063 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 0, 6); | |
b61fafc4 ACM |
1064 | MODULE_LICENSE("GPL"); |
1065 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>"); | |
1066 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |