1 /* $NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 ozaki-r 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 1.24 2017/09/25 01:56:22 ozaki-r 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
60 static u_long raw_sendspace = RAWSNDQ;
61 static u_long raw_recvspace = RAWRCVQ;
62
63 /*
64 * Allocate a nominal amount of buffer space for the socket.
65 */
66 int
raw_attach(struct socket * so,int proto,struct rawcbhead * rawcbhead)67 raw_attach(struct socket *so, int proto, struct rawcbhead *rawcbhead)
68 {
69 struct rawcb *rp;
70 int error;
71
72 /*
73 * It is assumed that raw_attach() is called after space has been
74 * allocated for the rawcb; consumer protocols may simply allocate
75 * type struct rawcb, or a wrapper data structure that begins with a
76 * struct rawcb.
77 */
78 rp = sotorawcb(so);
79 KASSERT(rp != NULL);
80 sosetlock(so);
81
82 if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
83 return error;
84 }
85 rp->rcb_socket = so;
86 rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
87 rp->rcb_proto.sp_protocol = proto;
88 LIST_INSERT_HEAD(rawcbhead, rp, rcb_list);
89 KASSERT(solocked(so));
90
91 return 0;
92 }
93
94 /*
95 * Detach the raw connection block and discard socket resources.
96 */
97 void
raw_detach(struct socket * so)98 raw_detach(struct socket *so)
99 {
100 struct rawcb *rp = sotorawcb(so);
101 const size_t rcb_len = rp->rcb_len;
102
103 KASSERT(rp != NULL);
104 KASSERT(solocked(so));
105
106 /* Remove the last reference. */
107 LIST_REMOVE(rp, rcb_list);
108 so->so_pcb = NULL;
109
110 /* Note: sofree() drops the socket's lock. */
111 sofree(so);
112 kmem_free(rp, rcb_len);
113 if (so->so_lock != softnet_lock) {
114 so->so_lock = softnet_lock;
115 mutex_obj_hold(softnet_lock);
116 }
117 mutex_enter(softnet_lock);
118 }
119
120 /*
121 * Disconnect and possibly release resources.
122 */
123 void
raw_disconnect(struct rawcb * rp)124 raw_disconnect(struct rawcb *rp)
125 {
126 struct socket *so = rp->rcb_socket;
127
128 if (so->so_state & SS_NOFDREF) {
129 raw_detach(so);
130 }
131 }
132