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Add mtu facility to --ra-param.

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This commit is contained in:
David Flamand
2017-04-11 11:49:54 +01:00
committed by Simon Kelley
parent 503c609149
commit 005c46d6f5
6 changed files with 44 additions and 20 deletions
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31
src/radv.c
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@@ -243,7 +243,7 @@ static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_ad
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 @@ static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_ad
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);