commit b00113f49a8128a47ae5d908c024cf122b725585
author Maciej Żenczykowski <maze@google.com> Sat Jan 18 23:56:14 2020 -0800
committer Maciej Żenczykowski <maze@google.com> Mon Jan 20 20:36:43 2020 -0800
tree 288263ef03ad0e74f3e59eca1bbde7f1b133504b
parent 6021ef919ba0a79243817a5e52c5e228441f1c64

Derive mtu from ipv6 route to ipv4 /96 prefix instead of device

Test: builds, atest, still needs testing on real network
  x86 clatd_test
  --------------
  clatd_test (19 Tests)
  ...
  [6/19] ClatdTest#DetectMtu: PASSED (0ms)
  ...
Bug: 147935930
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I3d11ba082dabf70089867146acd84f6436953663

clatd.h

diff --git a/clatd.h b/clatd.h
index d3869bf..e1d28a7 100644
--- a/clatd.h
+++ b/clatd.h
@@ -36,15 +36,16 @@
 #define NO_TRAFFIC_INTERFACE_POLL_FREQUENCY 90
 
 void stop_loop();
-void configure_tun_ip(const struct tun_data *tunnel, const char *v4_addr);
+void configure_tun_ip(const struct tun_data *tunnel, const char *v4_addr, int mtu);
 void set_capability(uint64_t target_cap);
 void drop_root_but_keep_caps();
 void open_sockets(struct tun_data *tunnel, uint32_t mark);
 int ipv6_address_changed(const char *interface);
 int configure_clat_ipv6_address(const struct tun_data *tunnel, const char *interface,
                                 const char *src_addr);
+int detect_mtu(const struct in6_addr *plat_subnet, uint32_t plat_suffix, uint32_t mark);
 void configure_interface(const char *uplink_interface, const char *plat_prefix, const char *v4_addr,
-                         const char *v6, struct tun_data *tunnel, unsigned net_id);
+                         const char *v6, struct tun_data *tunnel, unsigned net_id, uint32_t mark);
 void event_loop(struct tun_data *tunnel);
 
 /* function: parse_int