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-rw-r--r--clatd.c95
-rw-r--r--config.c37
-rw-r--r--config.h3
3 files changed, 59 insertions, 76 deletions
diff --git a/clatd.c b/clatd.c
index f5d625d..78ccccc 100644
--- a/clatd.c
+++ b/clatd.c
@@ -150,42 +150,6 @@ int configure_packet_socket(int sock) {
return 1;
}
-/* function: interface_poll
- * polls the uplink network interface for address changes
- * tunnel - tun device data
- */
-void interface_poll(const struct tun_data *tunnel) {
- union anyip *interface_ip;
- char *interface = Global_Clatd_Config.default_pdp_interface;
-
- interface_ip = getinterface_ip(interface, AF_INET6);
- if(!interface_ip) {
- logmsg(ANDROID_LOG_WARN,"unable to find an ipv6 ip on interface %s", interface);
- return;
- }
-
- if(!ipv6_prefix_equal(&interface_ip->ip6, &Global_Clatd_Config.ipv6_local_subnet)) {
- config_generate_local_ipv6_subnet(&interface_ip->ip6);
-
- char from_addr[INET6_ADDRSTRLEN], to_addr[INET6_ADDRSTRLEN];
- inet_ntop(AF_INET6, &Global_Clatd_Config.ipv6_local_subnet, from_addr, sizeof(from_addr));
- inet_ntop(AF_INET6, &interface_ip->ip6, to_addr, sizeof(to_addr));
- logmsg(ANDROID_LOG_WARN, "clat IPv6 address changed from %s to %s", from_addr, to_addr);
-
- // Start translating packets to the new prefix.
- Global_Clatd_Config.ipv6_local_subnet = interface_ip->ip6;
-
- // Update our packet socket filter to reflect the new 464xlat IP address.
- if (!configure_packet_socket(tunnel->read_fd6)) {
- // Things aren't going to work. Bail out and hope we have better luck next time.
- // We don't log an error here because configure_packet_socket has already done so.
- exit(1);
- }
- }
-
- free(interface_ip);
-}
-
/* function: configure_tun_ip
* configures the ipv4 and ipv6 addresses on the tunnel interface
* tunnel - tun device data
@@ -275,6 +239,58 @@ void open_sockets(struct tun_data *tunnel, uint32_t mark) {
tunnel->read_fd6 = packetsock;
}
+/* function: update_clat_ipv6_address
+ * picks the clat IPv6 address and configures packet translation to use it.
+ * tunnel - tun device data
+ * interface - uplink interface name
+ * returns: 1 on success, 0 on failure
+ */
+int update_clat_ipv6_address(const struct tun_data *tunnel, const char *interface) {
+ union anyip *interface_ip;
+ char addrstr[INET6_ADDRSTRLEN];
+
+ // TODO: check that the prefix length is /64.
+ interface_ip = getinterface_ip(interface, AF_INET6);
+ if (!interface_ip) {
+ logmsg(ANDROID_LOG_ERROR, "Unable to find an IPv6 address on interface %s", interface);
+ return 0;
+ }
+
+ // If our prefix hasn't changed, do nothing. (If this is the first time we configure an IPv6
+ // address, Global_Clatd_Config.ipv6_local_subnet will be ::, which won't match our new prefix.)
+ if (ipv6_prefix_equal(&interface_ip->ip6, &Global_Clatd_Config.ipv6_local_subnet)) {
+ free(interface_ip);
+ return 1;
+ }
+
+ // Generate an interface ID.
+ config_generate_local_ipv6_subnet(&interface_ip->ip6);
+ inet_ntop(AF_INET6, &interface_ip->ip6, addrstr, sizeof(addrstr));
+
+ if (IN6_IS_ADDR_UNSPECIFIED(&Global_Clatd_Config.ipv6_local_subnet)) {
+ // Startup.
+ logmsg(ANDROID_LOG_INFO, "Using %s on %s", addrstr, interface);
+ } else {
+ // Prefix change.
+ char from_addr[INET6_ADDRSTRLEN];
+ inet_ntop(AF_INET6, &Global_Clatd_Config.ipv6_local_subnet, from_addr, sizeof(from_addr));
+ logmsg(ANDROID_LOG_INFO, "clat IPv6 address changed from %s to %s", from_addr, addrstr);
+ }
+
+ // Start translating packets to the new prefix.
+ Global_Clatd_Config.ipv6_local_subnet = interface_ip->ip6;
+ free(interface_ip);
+
+ // Update our packet socket filter to reflect the new 464xlat IP address.
+ if (!configure_packet_socket(tunnel->read_fd6)) {
+ // Things aren't going to work. Bail out and hope we have better luck next time.
+ // We don't log an error here because configure_packet_socket has already done so.
+ exit(1);
+ }
+
+ return 1;
+}
+
/* function: configure_interface
* reads the configuration and applies it to the interface
* uplink_interface - network interface to use to reach the ipv6 internet
@@ -404,7 +420,7 @@ void event_loop(const struct tun_data *tunnel) {
time_t now = time(NULL);
if(last_interface_poll < (now - INTERFACE_POLL_FREQUENCY)) {
- interface_poll(tunnel);
+ update_clat_ipv6_address(tunnel, Global_Clatd_Config.default_pdp_interface);
last_interface_poll = now;
}
}
@@ -511,10 +527,7 @@ int main(int argc, char **argv) {
configure_interface(uplink_interface, plat_prefix, &tunnel, net_id);
- if (!configure_packet_socket(tunnel.read_fd6)) {
- // We've already logged an error.
- exit(1);
- }
+ update_clat_ipv6_address(&tunnel, uplink_interface);
// Loop until someone sends us a signal or brings down the tun interface.
if(signal(SIGTERM, stop_loop) == SIG_ERR) {
diff --git a/config.c b/config.c
index 09d3df0..4939478 100644
--- a/config.c
+++ b/config.c
@@ -229,36 +229,6 @@ void config_generate_local_ipv6_subnet(struct in6_addr *interface_ip) {
}
}
-/* function: subnet_from_interface
- * finds the ipv6 subnet configured on the specified interface
- * root - parsed configuration
- * interface - network interface name
- */
-int subnet_from_interface(cnode *root, const char *interface) {
- union anyip *interface_ip;
- char addrstr[INET6_ADDRSTRLEN];
-
- if(!config_item_ip6(root, "ipv6_host_id", "::", &Global_Clatd_Config.ipv6_host_id))
- return 0;
-
- // TODO: check that the prefix length is /64.
- interface_ip = getinterface_ip(interface, AF_INET6);
- if(!interface_ip) {
- logmsg(ANDROID_LOG_FATAL,"unable to find an ipv6 ip on interface %s",interface);
- return 0;
- }
-
- memcpy(&Global_Clatd_Config.ipv6_local_subnet, &interface_ip->ip6, sizeof(struct in6_addr));
- free(interface_ip);
-
- config_generate_local_ipv6_subnet(&Global_Clatd_Config.ipv6_local_subnet);
-
- inet_ntop(AF_INET6, &Global_Clatd_Config.ipv6_local_subnet, addrstr, sizeof(addrstr));
- logmsg(ANDROID_LOG_INFO, "Using %s on %s", addrstr, interface);
-
- return 1;
-}
-
/* function: read_config
* reads the config file and parses it into the global variable Global_Clatd_Config. returns 0 on failure, 1 on success
* file - filename to parse
@@ -284,7 +254,9 @@ int read_config(const char *file, const char *uplink_interface, const char *plat
goto failed;
}
- strncpy(Global_Clatd_Config.default_pdp_interface, uplink_interface, sizeof(Global_Clatd_Config.default_pdp_interface));
+ Global_Clatd_Config.default_pdp_interface = strdup(uplink_interface);
+ if (!Global_Clatd_Config.default_pdp_interface)
+ goto failed;
if(!config_item_int16_t(root, "mtu", "-1", &Global_Clatd_Config.mtu))
goto failed;
@@ -318,10 +290,9 @@ int read_config(const char *file, const char *uplink_interface, const char *plat
}
}
- if(!subnet_from_interface(root,Global_Clatd_Config.default_pdp_interface))
+ if (!config_item_ip6(root, "ipv6_host_id", "::", &Global_Clatd_Config.ipv6_host_id))
goto failed;
-
return 1;
failed:
diff --git a/config.h b/config.h
index 654e909..a56d6fc 100644
--- a/config.h
+++ b/config.h
@@ -19,7 +19,6 @@
#define __CONFIG_H__
#include <netinet/in.h>
-#include <sys/system_properties.h>
#define DEFAULT_IPV4_LOCAL_SUBNET "192.0.0.4"
@@ -31,7 +30,7 @@ struct clat_config {
struct in6_addr ipv6_host_id;
struct in_addr ipv4_local_subnet;
struct in6_addr plat_subnet;
- char default_pdp_interface[PROP_VALUE_MAX];
+ char *default_pdp_interface;
char *plat_from_dns64_hostname;
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-21 06:54:03 +0000