1/*	$KAME: dccp6_usrreq.c,v 1.13 2005/07/27 08:42:56 nishida Exp $	*/
2/*	$NetBSD: dccp6_usrreq.c,v 1.15 2022/11/04 09:01:53 ozaki-r Exp $ */
3
4/*
5 * Copyright (C) 2003 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: dccp6_usrreq.c,v 1.15 2022/11/04 09:01:53 ozaki-r Exp $");
35
36#ifdef _KERNEL_OPT
37#include "opt_inet.h"
38#include "opt_dccp.h"
39#include "opt_net_mpsafe.h"
40#endif
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/domain.h>
45#include <sys/kernel.h>
46#include <sys/pool.h>
47#include <sys/lock.h>
48#include <sys/malloc.h>
49#include <sys/mbuf.h>
50#include <sys/proc.h>
51#include <sys/protosw.h>
52#include <sys/signalvar.h>
53#include <sys/socket.h>
54#include <sys/socketvar.h>
55#include <sys/mutex.h>
56#include <sys/sysctl.h>
57#include <sys/syslog.h>
58#include <sys/queue.h>
59
60#include <net/if.h>
61
62#include <netinet/in.h>
63#include <netinet/in_systm.h>
64#include <netinet/ip.h>
65#include <netinet/in_pcb.h>
66#include <netinet/in_var.h>
67#include <netinet/ip6.h>
68#include <netinet/ip_icmp.h>
69#include <netinet/icmp_var.h>
70#include <netinet/ip_var.h>
71#include <netinet6/in6_pcb.h>
72#include <netinet6/ip6_var.h>
73#include <netinet/dccp.h>
74#include <netinet/dccp_var.h>
75#include <netinet6/dccp6_var.h>
76#include <netinet/dccp_cc_sw.h>
77
78#if !defined(__FreeBSD__) || __FreeBSD_version < 500000
79#define	INP_INFO_LOCK_INIT(x,y)
80#define	INP_INFO_WLOCK(x)
81#define INP_INFO_WUNLOCK(x)
82#define	INP_INFO_RLOCK(x)
83#define INP_INFO_RUNLOCK(x)
84#define	INP_LOCK(x)
85#define INP_UNLOCK(x)
86#endif
87
88#define PULLDOWN_TEST
89
90int
91dccp6_input(struct mbuf **mp, int *offp, int proto)
92{
93	struct mbuf *m = *mp;
94	DCCP_DEBUG((LOG_INFO, "In dccp6_input!\n"));
95#ifndef PULLDOWN_TEST
96	IP6_EXTHDR_CHECK(m, *offp, sizeof(struct dccphdr), IPPROTO_DONE);
97#endif
98
99	dccp_input(m, *offp, proto);
100	return IPPROTO_DONE;
101}
102
103void *
104dccp6_ctlinput(int cmd, const struct sockaddr *sa, void *d)
105{
106	if (sa->sa_family != AF_INET6 ||
107	    sa->sa_len != sizeof(struct sockaddr_in6))
108		return NULL;
109
110	/* FIX LATER */
111	return NULL;
112}
113
114int
115dccp6_bind(struct socket *so, struct sockaddr *nam, struct lwp *td)
116{
117	struct inpcb *inp;
118	int error;
119	struct sockaddr_in6 *sinp = (struct sockaddr_in6 *)nam;
120
121	DCCP_DEBUG((LOG_INFO, "Entering dccp6_bind!\n"));
122	INP_INFO_WLOCK(&dccpbinfo);
123	inp = sotoinpcb(so);
124	if (inp == 0) {
125		INP_INFO_WUNLOCK(&dccpbinfo);
126		DCCP_DEBUG((LOG_INFO, "dccp6_bind: inp == 0!\n"));
127		return EINVAL;
128	}
129	/* Do not bind to multicast addresses! */
130	if (sinp->sin6_family == AF_INET6 &&
131	    IN6_IS_ADDR_MULTICAST(&sinp->sin6_addr)) {
132		INP_INFO_WUNLOCK(&dccpbinfo);
133		return EAFNOSUPPORT;
134	}
135	INP_LOCK(inp);
136
137	intodccpcb(inp)->inp_vflag &= ~INP_IPV4;
138	intodccpcb(inp)->inp_vflag |= INP_IPV6;
139
140	error = in6pcb_bind(inp, sinp, td);
141	INP_UNLOCK(inp);
142	INP_INFO_WUNLOCK(&dccpbinfo);
143	return error;
144}
145
146int
147dccp6_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
148{
149	struct inpcb *inp;
150	struct dccpcb *dp;
151	int error;
152	struct sockaddr_in6 *sin6;
153	char test[2];
154
155	DCCP_DEBUG((LOG_INFO, "Entering dccp6_connect!\n"));
156
157#ifndef __NetBSD__
158	INP_INFO_WLOCK(&dccpbinfo);
159	inp = sotoinpcb(so);
160	if (inp == 0) {
161		INP_INFO_WUNLOCK(&dccpbinfo);
162		return EINVAL;
163	}
164	INP_LOCK(inp);
165	if (in6p_faddr(inp).s_addr != INADDR_ANY) {
166		INP_UNLOCK(inp);
167		INP_INFO_WUNLOCK(&dccpbinfo);
168		return EISCONN;
169	}
170
171	dp = (struct dccpcb *)inp->inp_ppcb;
172#else
173	inp = sotoinpcb(so);
174	if (inp == 0) {
175		return EINVAL;
176	}
177	if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp))) {
178		return EISCONN;
179	}
180
181	dp = (struct dccpcb *)inp->inp_ppcb;
182#endif
183	if (dp->state == DCCPS_ESTAB) {
184		DCCP_DEBUG((LOG_INFO, "Why are we in connect when we already have a established connection?\n"));
185	}
186
187	dp->who = DCCP_CLIENT;
188	dp->seq_snd = (((u_int64_t)random() << 32) | random()) % 281474976710656LL;
189
190	sin6 = (struct sockaddr_in6 *)nam;
191	if (sin6->sin6_family == AF_INET6
192	    && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
193		error = EAFNOSUPPORT;
194		goto bad;
195	}
196
197	dp->inp_vflag &= ~INP_IPV4;
198	dp->inp_vflag |= INP_IPV6;
199
200	error = dccp_doconnect(so, nam, l, 1);
201
202	if (error != 0)
203		goto bad;
204
205	callout_reset(&dp->retrans_timer, dp->retrans, dccp_retrans_t, dp);
206	callout_reset(&dp->connect_timer, DCCP_CONNECT_TIMER, dccp_connect_t, dp);
207
208	test[0] = dp->pref_cc;
209#if 0
210	/* FIX THIS LATER */
211	if (dp->pref_cc == 2) {
212		test[1] = 3;
213	} else {
214		test[1] = 2;
215	}
216	dccp_add_feature(dp, DCCP_OPT_CHANGE, DCCP_FEATURE_CC, test, 2);
217	dccp_add_feature(dp, DCCP_OPT_PREFER, DCCP_FEATURE_CC, test, 2);
218#else
219	 /* we only support CCID2 at this moment */
220	dccp_add_feature(dp, DCCP_OPT_CHANGE_R, DCCP_FEATURE_CC, test, 1);
221#endif
222
223	error = dccp_output(dp, 0);
224
225bad:
226	INP_UNLOCK(inp);
227	INP_INFO_WUNLOCK(&dccpbinfo);
228	return error;
229}
230
231
232int
233dccp6_listen(struct socket *so, struct lwp *l)
234{
235	struct inpcb *inp;
236	struct dccpcb *dp;
237	int error = 0;
238
239	DCCP_DEBUG((LOG_INFO, "Entering dccp6_listen!\n"));
240
241	INP_INFO_RLOCK(&dccpbinfo);
242	inp = sotoinpcb(so);
243	if (inp == 0) {
244		INP_INFO_RUNLOCK(&dccpbinfo);
245		return EINVAL;
246	}
247	INP_LOCK(inp);
248	INP_INFO_RUNLOCK(&dccpbinfo);
249	dp = intodccpcb(inp);
250	DCCP_DEBUG((LOG_INFO, "Checking inp->inp_lport!\n"));
251	if (inp->inp_lport == 0) {
252		error = in6pcb_bind(inp, NULL, l);
253	}
254	if (error == 0) {
255		dp->state = DCCPS_LISTEN;
256		dp->who = DCCP_LISTENER;
257		dp->seq_snd = 512;
258	}
259	INP_UNLOCK(inp);
260	return error;
261}
262
263int
264dccp6_accept(struct socket *so, struct sockaddr *nam)
265{
266	struct inpcb *inp = NULL;
267	int error = 0;
268
269	DCCP_DEBUG((LOG_INFO, "Entering dccp6_accept!\n"));
270	if (nam == NULL) {
271		return EINVAL;
272	}
273	if (so->so_state & SS_ISDISCONNECTED) {
274		DCCP_DEBUG((LOG_INFO, "so_state && SS_ISDISCONNECTED!, so->state = %i\n", so->so_state));
275		return ECONNABORTED;
276	}
277
278	INP_INFO_RLOCK(&dccpbinfo);
279	inp = sotoinpcb(so);
280	if (inp == 0) {
281		INP_INFO_RUNLOCK(&dccpbinfo);
282		return EINVAL;
283	}
284	INP_LOCK(inp);
285	INP_INFO_RUNLOCK(&dccpbinfo);
286	in6pcb_fetch_peeraddr(inp, (struct sockaddr_in6 *)nam);
287
288	INP_UNLOCK(inp);
289	return error;
290}
291
292static int
293dccp6_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
294{
295	int error = 0;
296	int family;
297
298	family = so->so_proto->pr_domain->dom_family;
299	switch (family) {
300	case PF_INET6:
301		error = in6_control(so, cmd, nam, ifp);
302		break;
303	default:
304		error =	 EAFNOSUPPORT;
305	}
306	return (error);
307}
308
309static int
310dccp6_stat(struct socket *so, struct stat *ub)
311{
312	return 0;
313}
314
315static int
316dccp6_purgeif(struct socket *so, struct ifnet *ifp)
317{
318	int s;
319
320	s = splsoftnet();
321	mutex_enter(softnet_lock);
322	in6pcb_purgeif0(&dccpbtable, ifp);
323#ifdef NET_MPSAFE
324	mutex_exit(softnet_lock);
325#endif
326	in6_purgeif(ifp);
327#ifdef NET_MPSAFE
328	mutex_enter(softnet_lock);
329#endif
330	in6pcb_purgeif(&dccpbtable, ifp);
331	mutex_exit(softnet_lock);
332	splx(s);
333
334	return 0;
335}
336
337static int
338dccp6_attach(struct socket *so, int proto)
339{
340	return dccp_attach(so, proto);
341}
342
343static int
344dccp6_detach(struct socket *so)
345{
346	return dccp_detach(so);
347}
348
349static int
350dccp6_connect2(struct socket *so, struct socket *so2)
351{
352	KASSERT(solocked(so));
353
354	return EOPNOTSUPP;
355}
356
357static int
358dccp6_disconnect(struct socket *so)
359{
360	return dccp_disconnect(so);
361}
362
363static int
364dccp6_shutdown(struct socket *so)
365{
366	return dccp_shutdown(so);
367}
368
369static int
370dccp6_abort(struct socket *so)
371{
372	return dccp_abort(so);
373}
374
375
376static int
377dccp6_peeraddr(struct socket *so, struct sockaddr *nam)
378{
379	KASSERT(solocked(so));
380	KASSERT(sotoinpcb(so) != NULL);
381	KASSERT(nam != NULL);
382
383	in6pcb_fetch_peeraddr(sotoinpcb(so), (struct sockaddr_in6 *)nam);
384	return 0;
385}
386
387static int
388dccp6_sockaddr(struct socket *so, struct sockaddr *nam)
389{
390	KASSERT(solocked(so));
391	KASSERT(sotoinpcb(so) != NULL);
392	KASSERT(nam != NULL);
393
394	in6pcb_fetch_sockaddr(sotoinpcb(so), (struct sockaddr_in6 *)nam);
395	return 0;
396}
397
398static int
399dccp6_recvoob(struct socket *so, struct mbuf *m, int flags)
400{
401	KASSERT(solocked(so));
402
403	return EOPNOTSUPP;
404}
405
406static int
407dccp6_rcvd(struct socket *so, int flags, struct lwp *l)
408{
409	KASSERT(solocked(so));
410
411	return EOPNOTSUPP;
412}
413
414static int
415dccp6_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
416    struct mbuf *control, struct lwp *l)
417{
418	return dccp_send(so, m, nam, control, l);
419}
420
421static int
422dccp6_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
423{
424	KASSERT(solocked(so));
425
426	m_freem(m);
427	m_freem(control);
428
429	return EOPNOTSUPP;
430}
431
432
433PR_WRAP_USRREQS(dccp6)
434#define	dccp6_attach		dccp6_attach_wrapper
435#define	dccp6_detach		dccp6_detach_wrapper
436#define dccp6_accept		dccp6_accept_wrapper
437#define	dccp6_bind		dccp6_bind_wrapper
438#define	dccp6_listen		dccp6_listen_wrapper
439#define	dccp6_connect		dccp6_connect_wrapper
440#define	dccp6_connect2		dccp6_connect2_wrapper
441#define	dccp6_disconnect	dccp6_disconnect_wrapper
442#define	dccp6_shutdown		dccp6_shutdown_wrapper
443#define	dccp6_abort		dccp6_abort_wrapper
444#define	dccp6_ioctl		dccp6_ioctl_wrapper
445#define	dccp6_stat		dccp6_stat_wrapper
446#define	dccp6_peeraddr		dccp6_peeraddr_wrapper
447#define	dccp6_sockaddr		dccp6_sockaddr_wrapper
448#define	dccp6_rcvd		dccp6_rcvd_wrapper
449#define	dccp6_recvoob		dccp6_recvoob_wrapper
450#define	dccp6_send		dccp6_send_wrapper
451#define	dccp6_sendoob		dccp6_sendoob_wrapper
452#define	dccp6_purgeif		dccp6_purgeif_wrapper
453
454const struct pr_usrreqs dccp6_usrreqs = {
455	.pr_attach	= dccp6_attach,
456	.pr_detach	= dccp6_detach,
457	.pr_accept	= dccp6_accept,
458	.pr_bind	= dccp6_bind,
459	.pr_listen	= dccp6_listen,
460	.pr_connect	= dccp6_connect,
461	.pr_connect2	= dccp6_connect2,
462	.pr_disconnect	= dccp6_disconnect,
463	.pr_shutdown	= dccp6_shutdown,
464	.pr_abort	= dccp6_abort,
465	.pr_ioctl	= dccp6_ioctl,
466	.pr_stat	= dccp6_stat,
467	.pr_peeraddr	= dccp6_peeraddr,
468	.pr_sockaddr	= dccp6_sockaddr,
469	.pr_rcvd	= dccp6_rcvd,
470	.pr_recvoob	= dccp6_recvoob,
471	.pr_send	= dccp6_send,
472	.pr_sendoob	= dccp6_sendoob,
473	.pr_purgeif	= dccp6_purgeif,
474};
475