commit 4b919a56642ccd0a44920feace872aeb5b7a62cf
author Neale Ranns <nranns@cisco.com> Sat Mar 11 05:55:21 2017 -0800
committer Florin Coras <florin.coras@gmail.com> Fri Mar 17 15:49:39 2017 +0000
tree 17750f4efc80d7863b68f9cd08ab381cd00dd534
parent c60f557590f79b8817382bdd982825b66c4e0a73

Attached hosts

allow this config to function:
  set int ip address loop0 169.254.1.1/32  (the default GW address for attached hosts)
  set int unnumbered af_packet0 use loop0  ('enable' IP on the host interface)
  ip route add 192.168.1.1/32 via af_packet0 (where to find the host)
repeat for each host and host interface.
Inter-host communication is throught the /32 routes.
To allow this:
 1 - attached host routes have the ATTACHED flag set, so the ARP code accepts then as legitimate sources
 2 - unnumbered interfaces inherit the source address from the IP interface

Change-Id: Ib66c5f0e848c528f79372813adc3a0c11b50717f
Signed-off-by: Neale Ranns <nranns@cisco.com>

src/vnet/fib/fib_path.h

diff --git a/src/vnet/fib/fib_path.h b/src/vnet/fib/fib_path.h
index 91f49d0..14efc1a 100644
--- a/src/vnet/fib/fib_path.h
+++ b/src/vnet/fib/fib_path.h
@@ -63,6 +63,10 @@
      */
     FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED,
     /**
+     * The path is attached
+     */
+    FIB_PATH_CFG_ATTRIBUTE_ATTACHED,
+    /**
      * The path is a for-us path
      */
     FIB_PATH_CFG_ATTRIBUTE_LOCAL,
@@ -83,6 +87,7 @@
     [FIB_PATH_CFG_ATTRIBUTE_RESOLVE_HOST] = "resolve-host", \
     [FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED] = "resolve-attached", \
     [FIB_PATH_CFG_ATTRIBUTE_LOCAL] = "local",	        \
+    [FIB_PATH_CFG_ATTRIBUTE_ATTACHED] = "attached",	\
 }
 
 #define FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(_item) \
@@ -100,6 +105,7 @@
     FIB_PATH_CFG_FLAG_RESOLVE_HOST = (1 << FIB_PATH_CFG_ATTRIBUTE_RESOLVE_HOST),
     FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED = (1 << FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED),
     FIB_PATH_CFG_FLAG_LOCAL = (1 << FIB_PATH_CFG_ATTRIBUTE_LOCAL),
+    FIB_PATH_CFG_FLAG_ATTACHED = (1 << FIB_PATH_CFG_ATTRIBUTE_ATTACHED),
 } __attribute__ ((packed)) fib_path_cfg_flags_t;