raw_cb.c revision 196019 
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 196019 2009-08-01 19:26:27Z rwatson $
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/if.h>
47#include <net/raw_cb.h>
48#include <net/vnet.h>
49
50/*
51 * Routines to manage the raw protocol control blocks.
52 *
53 * TODO:
54 *	hash lookups by protocol family/protocol + address family
55 *	take care of unique address problems per AF?
56 *	redo address binding to allow wildcards
57 */
58
59struct mtx rawcb_mtx;
60VNET_DEFINE(struct rawcb_list_head, rawcb_list);
61
62SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
63
64static u_long	raw_sendspace = RAWSNDQ;
65SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
66    "Default raw socket send space");
67
68static u_long	raw_recvspace = RAWRCVQ;
69SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
70    "Default raw socket receive space");
71
72/*
73 * Allocate a control block and a nominal amount of buffer space for the
74 * socket.
75 */
76int
77raw_attach(struct socket *so, int proto)
78{
79	struct rawcb *rp = sotorawcb(so);
80	int error;
81
82	/*
83	 * It is assumed that raw_attach is called after space has been
84	 * allocated for the rawcb; consumer protocols may simply allocate
85	 * type struct rawcb, or a wrapper data structure that begins with a
86	 * struct rawcb.
87	 */
88	KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
89
90	error = soreserve(so, raw_sendspace, raw_recvspace);
91	if (error)
92		return (error);
93	rp->rcb_socket = so;
94	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
95	rp->rcb_proto.sp_protocol = proto;
96	mtx_lock(&rawcb_mtx);
97	LIST_INSERT_HEAD(&V_rawcb_list, rp, list);
98	mtx_unlock(&rawcb_mtx);
99	return (0);
100}
101
102/*
103 * Detach the raw connection block and discard socket resources.
104 */
105void
106raw_detach(struct rawcb *rp)
107{
108	struct socket *so = rp->rcb_socket;
109
110	KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
111
112	so->so_pcb = NULL;
113	mtx_lock(&rawcb_mtx);
114	LIST_REMOVE(rp, list);
115	mtx_unlock(&rawcb_mtx);
116	free((caddr_t)(rp), M_PCB);
117}
118