Use a packet socket to receive packets.

Combined with the previous change to send on a raw socket
instead of a tunnel interface, this allows us to get rid of the
clat interface and remove all the routing configuration code.

Bug: 15340961
Change-Id: I9d9b90f9b4f58dcc3c102abcdc32a2c7ee86b01d
diff --git a/Android.mk b/Android.mk
index f94acdf..a640e06 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,7 +1,7 @@
 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
-LOCAL_SRC_FILES:=clatd.c dump.c checksum.c translate.c icmp.c ipv4.c ipv6.c config.c dns64.c logging.c getaddr.c getroute.c netlink_callbacks.c netlink_msg.c setif.c setroute.c mtu.c
+LOCAL_SRC_FILES:=clatd.c dump.c checksum.c translate.c icmp.c ipv4.c ipv6.c config.c dns64.c logging.c getaddr.c netlink_callbacks.c netlink_msg.c setif.c mtu.c
 
 LOCAL_CFLAGS := -Wall -Werror -Wunused-parameter
 LOCAL_C_INCLUDES := external/libnl/include bionic/libc/dns/include