1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1986, 1993
5 *	The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)raw_cb.c	8.1 (Berkeley) 6/10/93
33 * $FreeBSD$
34 */
35
36#include <sys/param.h>
37#include <sys/domain.h>
38#include <sys/lock.h>
39#include <sys/kernel.h>
40#include <sys/malloc.h>
41#include <sys/mutex.h>
42#include <sys/protosw.h>
43#include <sys/socket.h>
44#include <sys/socketvar.h>
45#include <sys/sysctl.h>
46#include <sys/systm.h>
47
48#include <net/if.h>
49#include <net/vnet.h>
50#include <net/raw_cb.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;
62VNET_DEFINE(struct rawcb_list_head, rawcb_list);
63
64static SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
65    "Raw socket infrastructure");
66
67static u_long	raw_sendspace = RAWSNDQ;
68SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
69    "Default raw socket send space");
70
71static u_long	raw_recvspace = RAWRCVQ;
72SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
73    "Default raw socket receive space");
74
75/*
76 * Allocate a control block and a nominal amount of buffer space for the
77 * socket.
78 */
79int
80raw_attach(struct socket *so, int proto)
81{
82	struct rawcb *rp = sotorawcb(so);
83	int error;
84
85	/*
86	 * It is assumed that raw_attach is called after space has been
87	 * allocated for the rawcb; consumer protocols may simply allocate
88	 * type struct rawcb, or a wrapper data structure that begins with a
89	 * struct rawcb.
90	 */
91	KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
92
93	error = soreserve(so, raw_sendspace, raw_recvspace);
94	if (error)
95		return (error);
96	rp->rcb_socket = so;
97	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
98	rp->rcb_proto.sp_protocol = proto;
99	mtx_lock(&rawcb_mtx);
100	LIST_INSERT_HEAD(&V_rawcb_list, rp, list);
101	mtx_unlock(&rawcb_mtx);
102	return (0);
103}
104
105/*
106 * Detach the raw connection block and discard socket resources.
107 */
108void
109raw_detach(struct rawcb *rp)
110{
111	struct socket *so = rp->rcb_socket;
112
113	KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
114
115	so->so_pcb = NULL;
116	mtx_lock(&rawcb_mtx);
117	LIST_REMOVE(rp, list);
118	mtx_unlock(&rawcb_mtx);
119	free((caddr_t)(rp), M_PCB);
120}
121