raw_cb.c revision 193744 
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 193744 2009-06-08 19:57:35Z 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/if.h>
48#include <net/raw_cb.h>
49#include <net/route.h>
50#include <net/vnet.h>
51
52/*
53 * Routines to manage the raw protocol control blocks.
54 *
55 * TODO:
56 *	hash lookups by protocol family/protocol + address family
57 *	take care of unique address problems per AF?
58 *	redo address binding to allow wildcards
59 */
60
61struct mtx rawcb_mtx;
62#ifdef VIMAGE_GLOBALS
63struct rawcb_list_head rawcb_list;
64#endif
65
66SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
67
68static u_long	raw_sendspace = RAWSNDQ;
69SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
70    "Default raw socket send space");
71
72static u_long	raw_recvspace = RAWRCVQ;
73SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
74    "Default raw socket receive space");
75
76/*
77 * Allocate a control block and a nominal amount of buffer space for the
78 * socket.
79 */
80int
81raw_attach(struct socket *so, int proto)
82{
83	INIT_VNET_NET(so->so_vnet);
84	struct rawcb *rp = sotorawcb(so);
85	int error;
86
87	/*
88	 * It is assumed that raw_attach is called after space has been
89	 * allocated for the rawcb; consumer protocols may simply allocate
90	 * type struct rawcb, or a wrapper data structure that begins with a
91	 * struct rawcb.
92	 */
93	KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
94
95	error = soreserve(so, raw_sendspace, raw_recvspace);
96	if (error)
97		return (error);
98	rp->rcb_socket = so;
99	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
100	rp->rcb_proto.sp_protocol = proto;
101	mtx_lock(&rawcb_mtx);
102	LIST_INSERT_HEAD(&V_rawcb_list, rp, list);
103	mtx_unlock(&rawcb_mtx);
104	return (0);
105}
106
107/*
108 * Detach the raw connection block and discard socket resources.
109 */
110void
111raw_detach(struct rawcb *rp)
112{
113	struct socket *so = rp->rcb_socket;
114
115	KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
116
117	so->so_pcb = NULL;
118	mtx_lock(&rawcb_mtx);
119	LIST_REMOVE(rp, list);
120	mtx_unlock(&rawcb_mtx);
121	free((caddr_t)(rp), M_PCB);
122}
123