acl-plugin: add whitelisted ethertype mode (VPP-1163)

Currently, ACL plugin largely does not care about the
ethertypes other than 0x0800 (IPv4) and 0x86dd (IPv6),
the only exception being 0x0806 (ARP), which is
dealt with by the MACIP ACLs.

The other ethertypes in L2 mode are just let through.

This adds a new API message acl_interface_set_etype_whitelist,
which allows to flip the mode of a given interface
into "ethertype whitelist mode": the caller of this message
must supply the two lists (inbound and outbound) of the ethertypes
that are to be permitted, the rest of the ethertypes are
dropped.

The whitelisting for a given interface and direction takes
effect only when a policy ACL is also applied.

This operates on the same classifier node as the one used for
dispatching the policy ACL, thus, if one wishes for most of the
reasonable IPv4 deployments to continue to operate within
the whitelist mode, they must permit ARP ethertype (0x0806)

The empty list for a given direction resets the processing
to allow the unknown ethertypes. So, if one wants to just
permit the IPv4 and IPv6 and nothing else, one can add
their ethertypes to the whitelist.

Add the "show acl-plugin interface" corresponding outputs
about the whitelists, vat command, and unittests.

Change-Id: I4659978c801f36d554b6615e56e424b77876662c
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/plugins/acl/acl.api b/src/plugins/acl/acl.api
index e3166d691a8..047fc683b87 100644
--- a/src/plugins/acl/acl.api
+++ b/src/plugins/acl/acl.api
@@ -476,3 +476,23 @@ define macip_acl_interface_list_details
   u8 count;
   u32 acls[count];
 };
+
+/** \brief Set the ethertype whitelists on an interface. Takes effect when applying ACLs on the interface, so must be given prior.
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - the interface to alter the list of ACLs on
+    @param count - total number of whitelisted ethertypes in the vector
+    @param n_input - this many first elements correspond to input whitelisted ethertypes, the rest - output
+    @param whitelist - vector of whitelisted ethertypes
+*/
+
+autoreply manual_print define acl_interface_set_etype_whitelist
+{
+  u32 client_index;
+  u32 context;
+  u32 sw_if_index;
+  u8 count; /* Total number of ethertypes in the whitelist */
+  u8 n_input; /* first n_input ethertypes are input, the rest - output */
+  u16 whitelist[count];
+};
+