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/*
* l2_bvi.h : layer 2 Bridged Virtual Interface
*
* Copyright (c) 2013 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_l2bvi_h
#define included_l2bvi_h
#include <vlib/vlib.h>
#include <vnet/ethernet/ethernet.h>
#include <vppinfra/sparse_vec.h>
#include <vnet/l2/l2_input.h>
#define TO_BVI_ERR_OK 0
#define TO_BVI_ERR_BAD_MAC 1
#define TO_BVI_ERR_ETHERTYPE 2
// Send a packet from L2 processing to L3 via the BVI interface.
// Set next0 to the proper L3 input node.
// Return an error if the packet isn't what we expect.
static_always_inline u32
l2_to_bvi (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
vlib_buffer_t * b0,
u32 bvi_sw_if_index,
next_by_ethertype_t * l3_next,
u32 * next0)
{
u8 l2_len;
u16 ethertype;
u8 * l3h;
ethernet_header_t * e0;
vnet_hw_interface_t * hi;
e0 = vlib_buffer_get_current (b0);
hi = vnet_get_sup_hw_interface (vnet_main, bvi_sw_if_index);
// Perform L3 my-mac filter
if ((!ethernet_address_cast(e0->dst_address)) &&
(!eth_mac_equal((u8 *)e0, hi->hw_address))) {
return TO_BVI_ERR_BAD_MAC;
}
// Save L2 header position which may be changed due to packet replication
vnet_buffer (b0)->ethernet.start_of_ethernet_header = b0->current_data;
// Strip L2 header
l2_len = vnet_buffer(b0)->l2.l2_len;
vlib_buffer_advance (b0, l2_len);
l3h = vlib_buffer_get_current (b0);
ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2));
// Set the input interface to be the BVI interface
vnet_buffer(b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
vnet_buffer(b0)->sw_if_index[VLIB_TX] = ~0;
// Go to appropriate L3 input node
if (ethertype == ETHERNET_TYPE_IP4) {
*next0 = l3_next->input_next_ip4;
} else if (ethertype == ETHERNET_TYPE_IP6) {
*next0 = l3_next->input_next_ip6;
} else {
// uncommon ethertype, check table
u32 i0;
i0 = sparse_vec_index (l3_next->input_next_by_type, ethertype);
*next0 = vec_elt (l3_next->input_next_by_type, i0);
if (i0 == SPARSE_VEC_INVALID_INDEX) {
return TO_BVI_ERR_ETHERTYPE;
}
}
// increment BVI RX interface stat
vlib_increment_combined_counter
(vnet_main->interface_main.combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_RX,
vlib_main->cpu_index,
vnet_buffer(b0)->sw_if_index[VLIB_RX],
1,
vlib_buffer_length_in_chain (vlib_main, b0));
return TO_BVI_ERR_OK;
}
void
l2bvi_register_input_type (vlib_main_t * vm,
ethernet_type_t type,
u32 node_index);
#endif
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