/* * l2_fwd.c : layer 2 forwarding using l2fib * * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include /** * @file * @brief Ethernet Forwarding. * * Code in this file handles forwarding Layer 2 packets. This file calls * the FIB lookup, packet learning and the packet flooding as necessary. * Packet is then sent to the next graph node. */ typedef struct { /* Hash table */ BVT (clib_bihash) * mac_table; /* next node index for the L3 input node of each ethertype */ next_by_ethertype_t l3_next; /* convenience variables */ vlib_main_t *vlib_main; vnet_main_t *vnet_main; } l2fwd_main_t; typedef struct { /* per-pkt trace data */ u8 src[6]; u8 dst[6]; u32 sw_if_index; u16 bd_index; } l2fwd_trace_t; /* packet trace format function */ static u8 * format_l2fwd_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); l2fwd_trace_t *t = va_arg (*args, l2fwd_trace_t *); s = format (s, "l2-fwd: sw_if_index %d dst %U src %U bd_index %d", t->sw_if_index, format_ethernet_address, t->dst, format_ethernet_address, t->src, t->bd_index); return s; } l2fwd_main_t l2fwd_main; static vlib_node_registration_t l2fwd_node; #define foreach_l2fwd_error \ _(L2FWD, "L2 forward packets") \ _(FLOOD, "L2 forward misses") \ _(HIT, "L2 forward hits") \ _(BVI_BAD_MAC, "BVI L3 MAC mismatch") \ _(BVI_ETHERTYPE, "BVI packet with unhandled ethertype") \ _(FILTER_DROP, "Filter Mac Drop") \ _(REFLECT_DROP, "Reflection Drop") typedef enum { #define _(sym,str) L2FWD_ERROR_##sym, foreach_l2fwd_error #undef _ L2FWD_N_ERROR, } l2fwd_error_t; static char *l2fwd_error_strings[] = { #define _(sym,string) string, foreach_l2fwd_error #undef _ }; typedef enum { L2FWD_NEXT_L2_OUTPUT, L2FWD_NEXT_FLOOD, L2FWD_NEXT_DROP, L2FWD_N_NEXT, } l2fwd_next_t; /** Forward one packet based on the mac table lookup result. */ static_always_inline void l2fwd_process (vlib_main_t * vm, vlib_node_runtime_t * node, l2fwd_main_t * msm, vlib_error_main_t * em, vlib_buffer_t * b0, u32 sw_if_index0, l2fib_entry_result_t * result0, u32 * next0) { if (PREDICT_FALSE (result0->raw == ~0)) { /* * lookup miss, so flood * TODO:replicate packet to each intf in bridge-domain * For now just drop */ if (vnet_buffer (b0)->l2.feature_bitmap & L2INPUT_FEAT_UU_FLOOD) { *next0 = L2FWD_NEXT_FLOOD; } else { /* Flooding is disabled */ b0->error = node->errors[L2FWD_ERROR_FLOOD]; *next0 = L2FWD_NEXT_DROP; } } else { /* lookup hit, forward packet */ #ifdef COUNTERS em->counters[node_counter_base_index + L2FWD_ERROR_HIT] += 1; #endif vnet_buffer (b0)->sw_if_index[VLIB_TX] = result0->fields.sw_if_index; *next0 = L2FWD_NEXT_L2_OUTPUT; /* perform reflection check */ if (PREDICT_FALSE (sw_if_index0 == result0->fields.sw_if_index)) { b0->error = node->errors[L2FWD_ERROR_REFLECT_DROP]; *next0 = L2FWD_NEXT_DROP; /* perform filter check */ } else if (PREDICT_FALSE (result0->fields.filter)) { b0->error = node->errors[L2FWD_ERROR_FILTER_DROP]; *next0 = L2FWD_NEXT_DROP; /* perform BVI check */ } else if (PREDICT_FALSE (result0->fields.bvi)) { u32 rc; rc = l2_to_bvi (vm, msm->vnet_main, b0, vnet_buffer (b0)->sw_if_index[VLIB_TX], &msm->l3_next, next0); if (PREDICT_FALSE (rc)) { if (rc == TO_BVI_ERR_BAD_MAC) { b0->error = node->errors[L2FWD_ERROR_BVI_BAD_MAC]; *next0 = L2FWD_NEXT_DROP; } else if (rc == TO_BVI_ERR_ETHERTYPE) { b0->error = node->errors[L2FWD_ERROR_BVI_ETHERTYPE]; *next0 = L2
.vagrant/
enabled by default. * * @cliexpar * Example of how to enable fowarding: * @cliexcmd{set interface l2 forward GigabitEthernet0/8/0} * Example of how to disable fowarding: * @cliexcmd{set interface l2 forward GigabitEthernet0/8/0 disable} ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (int_fwd_cli, static) = { .path = "set interface l2 forward", .short_help = "set interface l2 forward [disable]", .function = int_fwd, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */