clatd: change to pass in tun filedescriptor via command line

Test: atest clatd_test, built and installed on aosp_blueline device
  connected to ipv6-only wifi network: ping 8.8.8.8 still works
  and it is via v4-wlan0 clat tun interface

Bug: 65674744
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8c9e235e9a5bf1a1436e8dc3af8d0aa86f6dc1a5

1 files changed, 0 insertions, 24 deletions

diff --git a/clatd.c b/clatd.c
index d68dc05..d332e1e 100644
--- a/clatd.c
+++ b/clatd.c
@@ -355,7 +355,6 @@ int configure_clat_ipv6_address(const struct tun_data *tunnel, const char *inter
  */
 void configure_interface(const char *uplink_interface, const char *plat_prefix, const char *v4_addr,
                          const char *v6_addr, struct tun_data *tunnel, unsigned net_id) {
-  int error;
 
   if (!read_config("/system/etc/clatd.conf", uplink_interface, plat_prefix, net_id)) {
     logmsg(ANDROID_LOG_FATAL, "read_config failed");
@@ -381,18 +380,6 @@ void configure_interface(const char *uplink_interface, const char *plat_prefix,
     logmsg(ANDROID_LOG_WARN, "ipv4mtu now set to = %d", Global_Clatd_Config.ipv4mtu);
   }
 
-  error = tun_alloc(tunnel->device4, tunnel->fd4, sizeof(tunnel->device4));
-  if (error < 0) {
-    logmsg(ANDROID_LOG_FATAL, "tun_alloc/4 failed: %s", strerror(errno));
-    exit(1);
-  }
-
-  error = set_nonblocking(tunnel->fd4);
-  if (error < 0) {
-    logmsg(ANDROID_LOG_FATAL, "set_nonblocking failed: %s", strerror(errno));
-    exit(1);
-  }
-
   configure_tun_ip(tunnel, v4_addr);
 
   if (!configure_clat_ipv6_address(tunnel, uplink_interface, v6_addr)) {
@@ -497,14 +484,3 @@ void event_loop(struct tun_data *tunnel) {
     }
   }
 }
-
-/* function: parse_unsigned
- * parses a string as a decimal/hex/octal unsigned integer
- *   str - the string to parse
- *   out - the unsigned integer to write to, gets clobbered on failure
- */
-int parse_unsigned(const char *str, unsigned *out) {
-  char *end_ptr;
-  *out = strtoul(str, &end_ptr, 0);
-  return *str && !*end_ptr;
-}