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apn_start(): Extend error message when setting IPv6 address fails 

Tell the user about possible causes of failure to set the IPv6
address of the tun device, such as general lack of IPv6 support in
the kernel/OS, or the use of /proc/sys/net/ipv6/conf/default/disable_ipv6

Change-Id: I5ff812425ee12b8386bb66521e05c93e825a4506
This commit is contained in:
Harald Welte 2017-10-01 18:16:17 +08:00
parent ed08eb1c5a
commit ed1ba2c902
1 changed files with 2 additions and 1 deletions
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3
ggsn/ggsn.c
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@ -186,7 +186,8 @@ int apn_start(struct apn_ctx *apn)
in46p_ntoa(&apn->v6.cfg.ifconfig_prefix));
if (tun_setaddr(apn->tun.tun, &apn->v6.cfg.ifconfig_prefix.addr, NULL,
apn->v6.cfg.ifconfig_prefix.prefixlen)) {
LOGPAPN(LOGL_ERROR, apn, "Failed to set tun IPv6 address %s: %s\n",
LOGPAPN(LOGL_ERROR, apn, "Failed to set tun IPv6 address %s: %s. "
"Ensure you have ipv6 support and not used the disable_ipv6 sysctl?\n",
in46p_ntoa(&apn->v6.cfg.ifconfig_prefix), strerror(errno));
apn_stop(apn, false);
return -1;