raw_cb.c revision 1.22 
1/*	$NetBSD: raw_cb.c,v 1.22 2014/05/21 20:43:56 rmind 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 1.22 2014/05/21 20:43:56 rmind 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/kmem.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
62static u_long		raw_sendspace = RAWSNDQ;
63static u_long		raw_recvspace = RAWRCVQ;
64
65/*
66 * Allocate a nominal amount of buffer space for the socket.
67 */
68int
69raw_attach(struct socket *so, int proto)
70{
71	struct rawcb *rp;
72	int error;
73
74	/*
75	 * It is assumed that raw_attach() is called after space has been
76	 * allocated for the rawcb; consumer protocols may simply allocate
77	 * type struct rawcb, or a wrapper data structure that begins with a
78	 * struct rawcb.
79	 */
80	rp = sotorawcb(so);
81	KASSERT(rp != NULL);
82	sosetlock(so);
83
84	if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
85		return error;
86	}
87	rp->rcb_socket = so;
88	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
89	rp->rcb_proto.sp_protocol = proto;
90	LIST_INSERT_HEAD(&rawcb, rp, rcb_list);
91	KASSERT(solocked(so));
92
93	return 0;
94}
95
96/*
97 * Detach the raw connection block and discard socket resources.
98 */
99void
100raw_detach(struct socket *so)
101{
102	struct rawcb *rp = sotorawcb(so);
103	const size_t rcb_len = rp->rcb_len;
104
105	KASSERT(rp != NULL);
106	KASSERT(solocked(so));
107	KASSERT(so->so_lock == softnet_lock);	/* XXX */
108
109	/* Remove the last reference. */
110	LIST_REMOVE(rp, rcb_list);
111	so->so_pcb = NULL;
112
113	/* Note: sofree() drops the socket's lock. */
114	sofree(so);
115	kmem_free(rp, rcb_len);
116	mutex_enter(softnet_lock);
117}
118
119/*
120 * Disconnect and possibly release resources.
121 */
122void
123raw_disconnect(struct rawcb *rp)
124{
125	struct socket *so = rp->rcb_socket;
126
127	if (so->so_state & SS_NOFDREF) {
128		raw_detach(so);
129	}
130}
131