raw_cb.c revision 181803 
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: head/sys/net/raw_cb.c 181803 2008-08-17 23:27:27Z bz $
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#include <sys/vimage.h>
46
47#include <net/raw_cb.h>
48
49/*
50 * Routines to manage the raw protocol control blocks.
51 *
52 * TODO:
53 *	hash lookups by protocol family/protocol + address family
54 *	take care of unique address problems per AF?
55 *	redo address binding to allow wildcards
56 */
57
58struct mtx rawcb_mtx;
59struct rawcb_list_head rawcb_list;
60
61SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
62
63static u_long	raw_sendspace = RAWSNDQ;
64SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
65    "Default raw socket send space");
66
67static u_long	raw_recvspace = RAWRCVQ;
68SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
69    "Default raw socket receive space");
70
71/*
72 * Allocate a control block and a nominal amount of buffer space for the
73 * socket.
74 */
75int
76raw_attach(struct socket *so, int proto)
77{
78	struct rawcb *rp = sotorawcb(so);
79	int error;
80
81	/*
82	 * It is assumed that raw_attach is called after space has been
83	 * allocated for the rawcb; consumer protocols may simply allocate
84	 * type struct rawcb, or a wrapper data structure that begins with a
85	 * struct rawcb.
86	 */
87	KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
88
89	error = soreserve(so, raw_sendspace, raw_recvspace);
90	if (error)
91		return (error);
92	rp->rcb_socket = so;
93	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
94	rp->rcb_proto.sp_protocol = proto;
95	mtx_lock(&rawcb_mtx);
96	LIST_INSERT_HEAD(&V_rawcb_list, rp, list);
97	mtx_unlock(&rawcb_mtx);
98	return (0);
99}
100
101/*
102 * Detach the raw connection block and discard socket resources.
103 */
104void
105raw_detach(struct rawcb *rp)
106{
107	struct socket *so = rp->rcb_socket;
108
109	KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
110
111	so->so_pcb = NULL;
112	mtx_lock(&rawcb_mtx);
113	LIST_REMOVE(rp, list);
114	mtx_unlock(&rawcb_mtx);
115	free((caddr_t)(rp), M_PCB);
116}
117