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 | |
60 | struct rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb); |
61 | |
62 | static u_long raw_sendspace = RAWSNDQ; |
63 | static u_long raw_recvspace = RAWRCVQ; |
64 | |
65 | /* |
66 | * Allocate a nominal amount of buffer space for the socket. |
67 | */ |
68 | int |
69 | raw_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 | */ |
99 | void |
100 | raw_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 | */ |
122 | void |
123 | raw_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 | |