Add mtu facility to --ra-param.
diff --git a/src/radv.c b/src/radv.c
index 6cf9a66..70211c5 100644
--- a/src/radv.c
+++ b/src/radv.c
@@ -243,7 +243,7 @@
struct dhcp_netid iface_id;
struct dhcp_opt *opt_cfg;
struct ra_interface *ra_param = find_iface_param(iface_name);
- int done_dns = 0, old_prefix = 0;
+ int done_dns = 0, old_prefix = 0, mtu = 0;
unsigned int min_pref_time;
#ifdef HAVE_LINUX_NETWORK
FILE *f;
@@ -399,22 +399,31 @@
put_opt6_long(1000 * calc_interval(find_iface_param(iface_name)));
}
+ /* Set the MTU from ra_param if any, an MTU of 0 mean automatic for linux, */
+ /* an MTU of -1 prevents the option from being sent. */
+ if (ra_param)
+ mtu = ra_param->mtu;
#ifdef HAVE_LINUX_NETWORK
/* Note that IPv6 MTU is not neccessarily the same as the IPv4 MTU
available from SIOCGIFMTU */
- sprintf(daemon->namebuff, "/proc/sys/net/ipv6/conf/%s/mtu", iface_name);
- if ((f = fopen(daemon->namebuff, "r")))
+ if (mtu == 0)
{
- if (fgets(daemon->namebuff, MAXDNAME, f))
- {
- put_opt6_char(ICMP6_OPT_MTU);
- put_opt6_char(1);
- put_opt6_short(0);
- put_opt6_long(atoi(daemon->namebuff));
- }
- fclose(f);
+ sprintf(daemon->namebuff, "/proc/sys/net/ipv6/conf/%s/mtu", iface_name);
+ if ((f = fopen(daemon->namebuff, "r")))
+ {
+ if (fgets(daemon->namebuff, MAXDNAME, f))
+ mtu = atoi(daemon->namebuff);
+ fclose(f);
+ }
}
#endif
+ if (mtu > 0)
+ {
+ put_opt6_char(ICMP6_OPT_MTU);
+ put_opt6_char(1);
+ put_opt6_short(0);
+ put_opt6_long(mtu);
+ }
iface_enumerate(AF_LOCAL, &send_iface, add_lla);