diff options
| author |   Neale Ranns <neale.ranns@cisco.com> | 2017-01-09 14:33:38 +0100 |
|---|---|---|
| committer |   Neale Ranns <nranns@cisco.com> | 2017-01-12 12:42:02 +0000 |
| commit | 797235a6aacccdb1503374439e91eca245b48294 (patch) | |
| tree | 3a9f13c727263e5513d19adfa90bfbacc6fda678 /src/vnet/ethernet/arp.c | |
| parent | 3f14e2305755e53d586a791cb5cb197021cd5186 (diff) | |
Fix ARP on unnumbered interfaces (VPP-583)
Change-Id: Iea1e2c31c016c3bb6344f73173d082a2c548ffee
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
Diffstat (limited to 'src/vnet/ethernet/arp.c')
| -rw-r--r-- | src/vnet/ethernet/arp.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/src/vnet/ethernet/arp.c b/src/vnet/ethernet/arp.c index b388e778ac8..0298541bb46 100644 --- a/src/vnet/ethernet/arp.c +++ b/src/vnet/ethernet/arp.c @@ -1043,12 +1043,25 @@ arp_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) src_flags = fib_entry_get_flags (src_fei); if (!((FIB_ENTRY_FLAG_ATTACHED & src_flags) || - (FIB_ENTRY_FLAG_CONNECTED & src_flags)) || - sw_if_index0 != fib_entry_get_resolving_interface (src_fei)) + (FIB_ENTRY_FLAG_CONNECTED & src_flags))) { + /* + * The packet was sent from an address that is not connected nor attached + * i.e. it is not from an address that is covered by a link's sub-net, + * nor is it a already learned host resp. + */ error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local; goto drop2; } + if (sw_if_index0 != fib_entry_get_resolving_interface (src_fei)) + { + /* + * The interface the ARP was received on is not the interface + * on which the covering prefix is configured. Maybe this is a case + * for unnumbered. + */ + is_unnum0 = 1; + } /* Reject requests/replies with our local interface address. */ if (FIB_ENTRY_FLAG_LOCAL & src_flags) |