diff options
Diffstat (limited to 'vnet/vnet/l2/l2_bvi.h')
-rw-r--r-- | vnet/vnet/l2/l2_bvi.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/vnet/vnet/l2/l2_bvi.h b/vnet/vnet/l2/l2_bvi.h new file mode 100644 index 00000000000..ca5673373fb --- /dev/null +++ b/vnet/vnet/l2/l2_bvi.h @@ -0,0 +1,122 @@ +/* + * 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_TAGGED 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; + + // 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; +} + + +// Prepare a packet that was sent to the BVI interface for L2 processing. + +static_always_inline void +bvi_to_l2 (vlib_main_t * vlib_main, + vnet_main_t * vnet_main, + u32 cpu_index, + vlib_buffer_t * b0, + u32 bvi_sw_if_index) +{ + // 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; + + // Update l2_len in packet which is expected by l2 path, + // including l2 tag push/pop code on output + vnet_update_l2_len(b0); + + // increment BVI TX interface stat + vlib_increment_combined_counter + (vnet_main->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, + cpu_index, + bvi_sw_if_index, + 1, + vlib_buffer_length_in_chain (vlib_main, b0)); +} + + +void +l2bvi_register_input_type (vlib_main_t * vm, + ethernet_type_t type, + u32 node_index); +#endif |