FreeBSD/Linux Kernel Cross Reference
sys/net/raw_cb.c
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 * $FreeBSD$
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
59 struct mtx rawcb_mtx;
60 VNET_DEFINE(struct rawcb_list_head, rawcb_list);
61
62 SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
63
64 static u_long raw_sendspace = RAWSNDQ;
65 SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
66 "Default raw socket send space");
67
68 static u_long raw_recvspace = RAWRCVQ;
69 SYSCTL_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 */
76 int
77 raw_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 */
105 void
106 raw_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 }
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