1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mindaugas Rasiukevicius.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* NPF network interface handling module.
*/
#ifdef _KERNEL
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: npf_ifaddr.c,v 1.8 2022/02/13 19:20:11 riastradh Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kmem.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#endif
#include "npf_impl.h"
static npf_table_t *
lookup_ifnet_table(npf_t *npf, ifnet_t *ifp)
{
const npf_ifops_t *ifops = npf->ifops;
char tname[NPF_TABLE_MAXNAMELEN];
const char *ifname;
npf_config_t *nc;
npf_table_t *t;
unsigned tid;
/* Get the interface name and prefix it. */
ifname = ifops->getname(npf, ifp);
snprintf(tname, sizeof(tname), ".ifnet-%s", ifname);
KERNEL_LOCK(1, NULL);
nc = npf_config_enter(npf);
/*
* Check whether this interface is of any interest to us.
*/
t = npf_tableset_getbyname(nc->tableset, tname);
if (!t) {
goto out;
}
tid = npf_table_getid(t);
/* Create a new NPF table for the interface. */
t = npf_table_create(tname, tid, NPF_TABLE_IFADDR, NULL, 0);
if (!t) {
goto out;
}
return t;
out:
npf_config_exit(npf);
KERNEL_UNLOCK_ONE(NULL);
return NULL;
}
static void
replace_ifnet_table(npf_t *npf, npf_table_t *newt)
{
npf_tableset_t *ts = atomic_load_relaxed(&npf->config)->tableset;
npf_table_t *oldt;
KASSERT(npf_config_locked_p(npf));
KERNEL_UNLOCK_ONE(NULL);
/*
* Finally, swap the tables and issue a sync barrier.
*/
oldt = npf_tableset_swap(ts, newt);
npf_config_sync(npf);
npf_config_exit(npf);
/* At this point, it is safe to destroy the old table. */
npf_table_destroy(oldt);
}
void
npf_ifaddr_sync(npf_t *npf, ifnet_t *ifp)
{
npf_table_t *t;
struct ifaddr *ifa;
/*
* First, check whether this interface is of any interest to us.
*
* => Acquires npf-config-lock and kernel-lock on success.
*/
t = lookup_ifnet_table(npf, ifp);
if (!t)
return;
/*
* Populate the table with the interface addresses.
* Note: currently, this list is protected by the kernel-lock.
*/
IFADDR_FOREACH(ifa, ifp) {
struct sockaddr *sa = ifa->ifa_addr;
const void *p = NULL;
int alen = 0;
if (sa->sa_family == AF_INET) {
const struct sockaddr_in *sin4 = satosin(sa);
alen = sizeof(struct in_addr);
p = &sin4->sin_addr;
}
if (sa->sa_family == AF_INET6) {
const struct sockaddr_in6 *sin6 = satosin6(sa);
alen = sizeof(struct in6_addr);
p = &sin6->sin6_addr;
}
if (alen) {
npf_addr_t addr;
memcpy(&addr, p, alen);
npf_table_insert(t, alen, &addr, NPF_NO_NETMASK);
}
}
/* Publish the new table. */
replace_ifnet_table(npf, t);
}
void
npf_ifaddr_flush(npf_t *npf, ifnet_t *ifp)
{
npf_table_t *t;
/*
* Flush: just load an empty table.
*/
t = lookup_ifnet_table(npf, ifp);
if (!t) {
return;
}
replace_ifnet_table(npf, t);
}
void
npf_ifaddr_syncall(npf_t *npf)
{
ifnet_t *ifp;
KERNEL_LOCK(1, NULL);
IFNET_GLOBAL_LOCK();
IFNET_WRITER_FOREACH(ifp) {
npf_ifaddr_sync(npf, ifp);
}
IFNET_GLOBAL_UNLOCK();
KERNEL_UNLOCK_ONE(NULL);
}
|