static gboolean
rdnss_expired (gpointer user_data)
{
NMIP6Device *device = user_data;
CallbackInfo info = { device, IP6_DHCP_OPT_NONE, FALSE };
nm_log_dbg (LOGD_IP6, "(%s): IPv6 RDNSS information expired", device->iface);
set_rdnss_timeout (device);
emit_config_changed (&info);
return FALSE;
}
static gboolean
rdnss_needs_refresh (gpointer user_data)
{
NMIP6Device *device = user_data;
gchar *msg;
msg = g_strdup_printf ("IPv6 RDNSS due to expire in %d seconds",
device->rdnss_timeout);
device_send_router_solicitation (device, msg);
g_free (msg);
set_rdnss_timeout (device);
return FALSE;
}
static gboolean
process_nduseropt_rdnss (NMIP6Device *device, struct nd_opt_hdr *opt)
{
size_t opt_len;
struct nd_opt_rdnss *rdnss_opt;
time_t now = time (NULL);
struct in6_addr *addr;
GArray *new_servers;
NMIP6RDNSS server, *cur_server;
gboolean changed = FALSE;
guint i;
opt_len = opt->nd_opt_len;
if (opt_len < 3 || (opt_len & 1) == 0)
return FALSE;
rdnss_opt = (struct nd_opt_rdnss *) opt;
new_servers = g_array_new (FALSE, FALSE, sizeof (NMIP6RDNSS));
/* Pad the DNS server expiry somewhat to give a bit of slack in cases
* where one RA gets lost or something (which can happen on unreliable
* links like WiFi where certain types of frames are not retransmitted).
* Note that 0 has special meaning and is therefore not adjusted.
*/
server.expires = ntohl (rdnss_opt->nd_opt_rdnss_lifetime);
if (server.expires > 0)
server.expires += now + 10;
for (addr = (struct in6_addr *) (rdnss_opt + 1); opt_len >= 2; addr++, opt_len -= 2) {
char buf[INET6_ADDRSTRLEN + 1];
if (!inet_ntop (AF_INET6, addr, buf, sizeof (buf))) {
nm_log_warn (LOGD_IP6, "(%s): received invalid RA-provided nameserver", device->iface);
continue;
}
/* Update the cached timeout if we already saw this server */
for (i = 0; i < device->rdnss_servers->len; i++) {
cur_server = &(g_array_index (device->rdnss_servers, NMIP6RDNSS, i));
if (!IN6_ARE_ADDR_EQUAL (addr, &cur_server->addr))
continue;
cur_server->expires = server.expires;
if (server.expires > 0) {
nm_log_dbg (LOGD_IP6, "(%s): refreshing RA-provided nameserver %s (expires in %ld seconds)",
device->iface, buf,
server.expires - now);
break;
}
nm_log_dbg (LOGD_IP6, "(%s): removing RA-provided nameserver %s on router request",
device->iface, buf);
g_array_remove_index (device->rdnss_servers, i);
changed = TRUE;
break;
}
if (server.expires == 0)
continue;
if (i < device->rdnss_servers->len)
continue;
nm_log_dbg (LOGD_IP6, "(%s): found RA-provided nameserver %s (expires in %ld seconds)",
device->iface, buf, server.expires - now);
server.addr = *addr;
g_array_append_val (new_servers, server);
}
/* New servers must be added in the order they are listed in the
* RA option and before any existing servers.
*
* Note: This is the place to remove servers if we want to cap the
* number of resolvers. The RFC states that the one to expire
* first of the existing servers should be removed.
*/
if (new_servers->len) {
g_array_prepend_vals (device->rdnss_servers,
new_servers->data, new_servers->len);
changed = TRUE;
}
g_array_free (new_servers, TRUE);
/* Timeouts may have changed even if IPs didn't */
set_rdnss_timeout (device);
return changed;
}
