2 * l2_bvi.h : layer 2 Bridged Virtual Interface
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef included_l2bvi_h
19 #define included_l2bvi_h
21 #include <vlib/vlib.h>
22 #include <vnet/ethernet/ethernet.h>
23 #include <vppinfra/sparse_vec.h>
25 #include <vnet/l2/l2_input.h>
27 #define TO_BVI_ERR_OK 0
28 #define TO_BVI_ERR_TAGGED 1
29 #define TO_BVI_ERR_ETHERTYPE 2
31 // Send a packet from L2 processing to L3 via the BVI interface.
32 // Set next0 to the proper L3 input node.
33 // Return an error if the packet isn't what we expect.
35 static_always_inline u32
36 l2_to_bvi (vlib_main_t * vlib_main,
37 vnet_main_t * vnet_main,
40 next_by_ethertype_t * l3_next,
47 // Save L2 header position which may be changed due to packet replication
48 vnet_buffer (b0)->ethernet.start_of_ethernet_header = b0->current_data;
51 l2_len = vnet_buffer(b0)->l2.l2_len;
52 vlib_buffer_advance (b0, l2_len);
54 l3h = vlib_buffer_get_current (b0);
55 ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2));
57 // Set the input interface to be the BVI interface
58 vnet_buffer(b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
59 vnet_buffer(b0)->sw_if_index[VLIB_TX] = ~0;
61 // Go to appropriate L3 input node
62 if (ethertype == ETHERNET_TYPE_IP4) {
63 *next0 = l3_next->input_next_ip4;
64 } else if (ethertype == ETHERNET_TYPE_IP6) {
65 *next0 = l3_next->input_next_ip6;
67 // uncommon ethertype, check table
70 i0 = sparse_vec_index (l3_next->input_next_by_type, ethertype);
71 *next0 = vec_elt (l3_next->input_next_by_type, i0);
73 if (i0 == SPARSE_VEC_INVALID_INDEX) {
74 return TO_BVI_ERR_ETHERTYPE;
78 // increment BVI RX interface stat
79 vlib_increment_combined_counter
80 (vnet_main->interface_main.combined_sw_if_counters
81 + VNET_INTERFACE_COUNTER_RX,
83 vnet_buffer(b0)->sw_if_index[VLIB_RX],
85 vlib_buffer_length_in_chain (vlib_main, b0));
90 // Prepare a packet that was sent to the BVI interface for L2 processing.
92 static_always_inline void
93 bvi_to_l2 (vlib_main_t * vlib_main,
94 vnet_main_t * vnet_main,
99 // Set the input interface to be the BVI interface
100 vnet_buffer(b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
101 vnet_buffer(b0)->sw_if_index[VLIB_TX] = ~0;
103 // Update l2_len in packet which is expected by l2 path,
104 // including l2 tag push/pop code on output
105 vnet_update_l2_len(b0);
107 // increment BVI TX interface stat
108 vlib_increment_combined_counter
109 (vnet_main->interface_main.combined_sw_if_counters
110 + VNET_INTERFACE_COUNTER_TX,
114 vlib_buffer_length_in_chain (vlib_main, b0));
119 l2bvi_register_input_type (vlib_main_t * vm,
120 ethernet_type_t type,