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Use /proc/sys/net/ipv6/conf/<iface>/mtu for RA advertised MTU.

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This commit is contained in:
Simon Kelley
2012-12-28 11:55:45 +00:00
parent 3bc0d932d0
commit 3b43646a08
1 changed files with 19 additions and 7 deletions
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16
src/radv.c
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@@ -193,6 +193,9 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
struct dhcp_netid iface_id;
struct dhcp_opt *opt_cfg;
int done_dns = 0;
#ifdef HAVE_LINUX_NETWORK
FILE *f;
#endif
save_counter(0);
ra = expand(sizeof(struct ra_packet));
@@ -231,13 +234,22 @@ static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *de
strncpy(ifr.ifr_name, iface_name, IF_NAMESIZE);
if (ioctl(daemon->icmp6fd, SIOCGIFMTU, &ifr) != -1)
#ifdef HAVE_LINUX_NETWORK
/* Note that IPv6 MTU is not necessarilly 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 (fgets(daemon->namebuff, MAXDNAME, f))
{
put_opt6_char(ICMP6_OPT_MTU);
put_opt6_char(1);
put_opt6_short(0);
put_opt6_long(ifr.ifr_mtu);
put_opt6_long(atoi(daemon->namebuff));
}
fclose(f);
}
#endif
iface_enumerate(AF_LOCAL, &iface, add_lla);