2 * Fetch ipforward value by reading /proc filesystem.
3 * Copyright (C) 1997 Kunihiro Ishiguro
5 * This file is part of GNU Zebra.
7 * GNU Zebra is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "zebra/ipforward.h"
31 extern struct zebra_privs_t zserv_privs
;
33 char proc_net_snmp
[] = "/proc/net/snmp";
35 static void dropline(FILE *fp
)
39 while ((c
= getc(fp
)) != '\n')
50 fp
= fopen(proc_net_snmp
, "r");
55 /* We don't care about the first line. */
58 /* Get ip_statistics.IpForwarding :
59 1 => ip forwarding enabled
60 2 => ip forwarding off. */
61 if (fgets(buf
, 6, fp
))
62 ret
= sscanf(buf
, "Ip: %d", &ipforwarding
);
66 if (ret
== 1 && ipforwarding
== 1)
72 /* char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/conf/all/forwarding"; */
73 char proc_ipv4_forwarding
[] = "/proc/sys/net/ipv4/ip_forward";
75 int ipforward_on(void)
79 frr_with_privs(&zserv_privs
) {
81 fp
= fopen(proc_ipv4_forwarding
, "w");
96 int ipforward_off(void)
100 frr_with_privs(&zserv_privs
) {
102 fp
= fopen(proc_ipv4_forwarding
, "w");
117 char proc_ipv6_forwarding
[] = "/proc/sys/net/ipv6/conf/all/forwarding";
119 int ipforward_ipv6(void)
124 int ipforwarding
= 0;
126 fp
= fopen(proc_ipv6_forwarding
, "r");
131 if (fgets(buf
, 2, fp
))
132 ret
= sscanf(buf
, "%d", &ipforwarding
);
142 int ipforward_ipv6_on(void)
146 frr_with_privs(&zserv_privs
) {
148 fp
= fopen(proc_ipv6_forwarding
, "w");
160 return ipforward_ipv6();
164 int ipforward_ipv6_off(void)
168 frr_with_privs(&zserv_privs
) {
170 fp
= fopen(proc_ipv6_forwarding
, "w");
182 return ipforward_ipv6();
185 #endif /* GNU_LINUX */