commit 4e1601e533b4b34d38e4eed229180257a385181b
author Maciej Żenczykowski <maze@google.com> Sat Mar 30 02:36:16 2019 -0700
committer Maciej Żenczykowski <maze@google.com> Sat Mar 30 10:09:19 2019 +0000
tree 20ae6f8e1ea2f9aca0c9603dfab3c780680be152
parent 6230574aad26ff06b9f19b24a74dc263aae3b6d8

clat - turn off spurious log messages caused by IPv6 packets

This eliminates log lines of the form:
  W clatd   : read_packet: unknown packet type = 0x86dd

Test: stuff is much quieter on device
Bug: 129305844
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8ee7478b4f956265233ba4e2c4237895607d697c

clatd.c

diff --git a/clatd.c b/clatd.c
index 3ccceea..94a0f06 100644
--- a/clatd.c
+++ b/clatd.c
@@ -430,6 +430,11 @@
   }
 
   uint16_t proto = ntohs(tun_header->proto);
+  if (proto == ETH_P_IPV6) {
+    // kernel IPv6 stack spams us with router/neighbour solication,
+    // multicast group joins, etc. which otherwise fills the log...
+    return;
+  }
   if (proto != ETH_P_IP) {
     logmsg(ANDROID_LOG_WARN, "%s: unknown packet type = 0x%x", __func__, proto);
     return;