apps.tap: add forwarding option

snabbco · May 19, 2022 · 8a5d3e2 · 8a5d3e2
1 parent ea636f4
commit 8a5d3e2
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/src/apps/tap/tap.lua b/src/apps/tap/tap.lua
@@ -28,7 +28,8 @@ Tap._config = {
    mtu_fixup = { default = true },
    mtu_offset = { default = 14 },
    mtu_set = { default = nil },
-   overwrite_src_mac = { default = false }
+   overwrite_src_mac = { default = false },
+   forwarding = { default = false }
 }
 
 -- Get or set the MTU of a tap device.  Return the current value.
@@ -142,6 +143,13 @@ function Tap:new (conf)
 
    local mac = _macaddr(sock, ifr)
 
+   if conf.forwarding then
+      local tap_sysctl_base = "net/ipv4/conf/"..conf.name
+      assert(S.sysctl(tap_sysctl_base.."/rp_filter", '0'))
+      assert(S.sysctl(tap_sysctl_base.."/accept_local", '1'))
+      assert(S.sysctl(tap_sysctl_base.."/forwarding", '1'))
+   end
+
    return setmetatable({fd = fd,
                         sock = sock,
                         ifr = ifr,