raw_cb.c revision 0c38754b8fec394218dedf4ebbd7a7e5c5ca6a96
1/*-
2 * Copyright (c) 1980, 1986, 1993
3 *	The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 *	@(#)raw_cb.c	8.1 (Berkeley) 6/10/93
31 * $FreeBSD$
32 */
33
34#include <sys/param.h>
35#include <sys/domain.h>
36#include <sys/lock.h>
37#include <sys/kernel.h>
38#include <sys/malloc.h>
39#include <sys/mutex.h>
40#include <sys/protosw.h>
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/sysctl.h>
44#include <sys/systm.h>
45
46#include <net/raw_cb.h>
47
48/*
49 * Routines to manage the raw protocol control blocks.
50 *
51 * TODO:
52 *	hash lookups by protocol family/protocol + address family
53 *	take care of unique address problems per AF?
54 *	redo address binding to allow wildcards
55 */
56
57struct mtx rawcb_mtx;
58struct rawcb_list_head rawcb_list;
59
60SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
61
62static u_long	raw_sendspace = RAWSNDQ;
63SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
64    "Default raw socket send space");
65
66static u_long	raw_recvspace = RAWRCVQ;
67SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
68    "Default raw socket receive space");
69
70/*
71 * Allocate a control block and a nominal amount of buffer space for the
72 * socket.
73 */
74int
75raw_attach(struct socket *so, int proto)
76{
77	struct rawcb *rp = sotorawcb(so);
78	int error;
79
80	/*
81	 * It is assumed that raw_attach is called after space has been
82	 * allocated for the rawcb; consumer protocols may simply allocate
83	 * type struct rawcb, or a wrapper data structure that begins with a
84	 * struct rawcb.
85	 */
86	KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
87
88	error = soreserve(so, raw_sendspace, raw_recvspace);
89	if (error)
90		return (error);
91	rp->rcb_socket = so;
92	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
93	rp->rcb_proto.sp_protocol = proto;
94	mtx_lock(&rawcb_mtx);
95	LIST_INSERT_HEAD(&rawcb_list, rp, list);
96	mtx_unlock(&rawcb_mtx);
97	return (0);
98}
99
100/*
101 * Detach the raw connection block and discard socket resources.
102 */
103void
104raw_detach(struct rawcb *rp)
105{
106	struct socket *so = rp->rcb_socket;
107
108	KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
109
110	so->so_pcb = NULL;
111	mtx_lock(&rawcb_mtx);
112	LIST_REMOVE(rp, list);
113	mtx_unlock(&rawcb_mtx);
114	free((caddr_t)(rp), M_PCB);
115}
116