diff options
Diffstat (limited to 'src/vnet/l2/l2_bvi.h')
| -rw-r--r-- | src/vnet/l2/l2_bvi.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_bvi.h b/src/vnet/l2/l2_bvi.h new file mode 100644 index 00000000000..dd1130a6c29 --- /dev/null +++ b/src/vnet/l2/l2_bvi.h @@ -0,0 +1,117 @@ +/* + * 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 + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |