raw_cb.c revision 1.20 
1/*	$NetBSD: raw_cb.c,v 1.20 2008/08/04 06:19:35 matt Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1986, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	@(#)raw_cb.c	8.1 (Berkeley) 6/10/93
32 */
33
34#include <sys/cdefs.h>
35__KERNEL_RCSID(0, "$NetBSD: raw_cb.c,v 1.20 2008/08/04 06:19:35 matt Exp $");
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/mbuf.h>
40#include <sys/socket.h>
41#include <sys/socketvar.h>
42#include <sys/domain.h>
43#include <sys/protosw.h>
44#include <sys/errno.h>
45
46#include <net/if.h>
47#include <net/route.h>
48#include <net/raw_cb.h>
49#include <netinet/in.h>
50
51/*
52 * Routines to manage the raw protocol control blocks.
53 *
54 * TODO:
55 *	hash lookups by protocol family/protocol + address family
56 *	take care of unique address problems per AF?
57 *	redo address binding to allow wildcards
58 */
59
60struct	rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb);
61
62u_long	raw_sendspace = RAWSNDQ;
63u_long	raw_recvspace = RAWRCVQ;
64
65/*
66 * Allocate a control block and a nominal amount
67 * of buffer space for the socket.
68 */
69int
70raw_attach(struct socket *so, int proto)
71{
72	struct rawcb *rp = sotorawcb(so);
73	int error;
74
75	/*
76	 * It is assumed that raw_attach is called
77	 * after space has been allocated for the
78	 * rawcb.
79	 */
80	if (rp == 0)
81		return (ENOBUFS);
82	if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0)
83		return (error);
84	rp->rcb_socket = so;
85	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
86	rp->rcb_proto.sp_protocol = proto;
87	LIST_INSERT_HEAD(&rawcb, rp, rcb_list);
88	return (0);
89}
90
91/*
92 * Detach the raw connection block and discard
93 * socket resources.
94 */
95void
96raw_detach(struct rawcb *rp)
97{
98	struct socket *so = rp->rcb_socket;
99
100	so->so_pcb = NULL;
101	KASSERT(so->so_lock == softnet_lock);	/* XXX */
102	LIST_REMOVE(rp, rcb_list);		/* remove last reference */
103	/* sofree drops the socket's lock. */
104	sofree(so);
105#ifdef notdef
106	if (rp->rcb_laddr)
107		m_freem(dtom(rp->rcb_laddr));
108	rp->rcb_laddr = 0;
109#endif
110	free((void *)rp, M_PCB);
111	mutex_enter(softnet_lock);
112}
113
114/*
115 * Disconnect and possibly release resources.
116 */
117void
118raw_disconnect(struct rawcb *rp)
119{
120
121#ifdef notdef
122	if (rp->rcb_faddr)
123		m_freem(dtom(rp->rcb_faddr));
124	rp->rcb_faddr = 0;
125#endif
126	if (rp->rcb_socket->so_state & SS_NOFDREF)
127		raw_detach(rp);
128}
129