/* * l2_emulation.h : Extract L3 packets from the L2 input and feed * them into the L3 path. * * 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 <plugins/l2e/l2e.h> #include <vnet/l2/l2_input.h> /** * Grouping of global data for the L2 emulation feature */ typedef struct l2_emulation_main_t_ { /** * Next nodes for L2 output features */ u32 l2_input_feat_next[32]; } l2_emulation_main_t; static l2_emulation_main_t l2_emulation_main; /** * Per-interface L2 configuration */ typedef struct l2_emulation_t_ { /** * Enabled or Disabled. * this is required since one L3 protocl can be enabled, but others not */ u8 enabled; } l2_emulation_t; /** * A zero'd out struct we can use in the vec_validate */ static const l2_emulation_t ezero = { }; /** * Per-interface vector of emulation configs */ l2_emulation_t *l2_emulations; void l2_emulation_enable (u32 sw_if_index) { vec_validate_init_empty (l2_emulations, sw_if_index, ezero); l2_emulation_t *l23e = &l2_emulations[sw_if_index]; l23e->enabled = 1; /* * L3 enable the interface - using IP unnumbered from the control * plane may not be possible since there may be no BVI interface * to which to unnumber */ ip4_sw_interface_enable_disable (sw_if_index, 1); ip6_sw_interface_enable_disable (sw_if_index, 1); l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_L2_EMULATION, 1); } void l2_emulation_disable (u32 sw_if_index) { if (vec_len (l2_emulations) >= sw_if_index) { l2_emulation_t *l23e = &l2_emulations[sw_if_index]; memset (l23e, 0, sizeof (*l23e)); l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_L2_EMULATION, 0); ip4_sw_interface_enable_disable (sw_if_index, 0); ip6_sw_interface_enable_disable (sw_if_index, 0); } } static clib_error_t * l2_emulation_interface_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_add) { if (is_add) { vec_validate_init_empty (l2_emulations, sw_if_index, ezero); } return (NULL); } VNET_SW_INTERFACE_ADD_DEL_FUNCTION (l2_emulation_interface_add_del); static clib_error_t * l2_emulation_cli (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); u32 sw_if_index = ~0; u8 enable = 1; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index)) ; else if (unformat (input, "enable")) enable = 1; else if (unformat (input, "disable")) enable = 0; else break; } if (~0 == sw_if_index) return clib_error_return (0, "interface must be specified"); if (enable) l2_emulation_enable (sw_if_index); else l2_emulation_disable (sw_if_index); return (NULL); } /*? * Configure l2 emulation. * When the interface is in L2 mode, configure the extraction of L3 * packets out of the L2 path and into the L3 path. * * @cliexpar * @cliexstart{set interface l2 input l2-emulation <interface-name> [disable]} * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (l2_emulation_cli_node, static) = { .path = "set interface l2 l2-emulation", .short_help = "set interface l2 l2-emulation <interface-name> [disable|enable]\n", .function = l2_emulation_cli, }; /* *INDENT-ON* */ static clib_error_t * l2_emulation_show (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); l2_emulation_t *l23e; u32 sw_if_index; vec_foreach_index (sw_if_index, l2_emulations) { l23e = &l2_emulations[sw_if_index]; if (l23e->enabled) { vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, vnm, sw_if_index); } } return (NULL); } /*? * Show l2 emulation. * When the interface is in L2 mode, configure the extraction of L3 * packets out of the L2 path and into the L3 path. * * @cliexpar * @cliexstart{show interface l2 l2-emulation} * @cliexend ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (l2_emulation_show_node, static) = { .path = "show interface l2 l2-emulation", .short_help = "show interface l2 l2-emulation\n", .function = l2_emulation_show, }; /* *INDENT-ON* */ #define foreach_l2_emulation \ _(IP4, "Extract IPv4") \ _(IP6, "Extract IPv6") typedef enum { #define _(sym,str) L2_EMULATION_ERROR_##sym, foreach_l2_emulation #undef _ L2_EMULATION_N_ERROR, } l2_emulation_error_t; static char *l2_emulation_error_strings[] = { #define _(sym,string) string, foreach_l2_emulation #undef _ }; typedef enum { #define _(sym,str) L2_EMULATION_NEXT_##sym, foreach_l2_emulation #undef _ L2_EMULATION_N_NEXT, } l2_emulation_next_t; /** * per-packet trace data */ typedef struct l2_emulation_trace_t_ { /* per-pkt trace data */ u8 extracted; } l2_emulation_trace_t; static uword l2_emulation_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { l2_emulation_main_t *em = &l2_emulation_main; u32 n_left_from, *from, *to_next; l2_emulation_next_t next_index; u32 ip4_hits = 0; u32 ip6_hits = 0; next_index = 0; n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { vlib_buffer_t *b0, *b1; u32 sw_if_index0, sw_if_index1; u16 ether_type0, ether_type1; u32 next0 = ~0, next1 = ~0; u8 l2_len0, l2_len1; u32 bi0, bi1; u8 *h0, *h1; bi0 = to_next[0] = from[0]; bi1 = to_next[1] = from[1]; from += 2; n_left_from -= 2; to_next += 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); l2_len0 = vnet_buffer (b0)->l2.l2_len; l2_len1 = vnet_buffer (b1)->l2.l2_len; h0 = vlib_buffer_get_current (b0); h1 = vlib_buffer_get_current (b1); ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2)); ether_type1 = clib_net_to_host_u16 (*(u16 *) (h1 + l2_len1 - 2)); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; /* * only extract unicast */ if (PREDICT_TRUE (!(h0[0] & 0x1))) { switch (ether_type0) { case ETHERNET_TYPE_IP4: ASSERT (l2_emulations[sw_if_index0].enabled); ++ip4_hits; next0 = L2_EMULATION_NEXT_IP4; vlib_buffer_advance (b0, l2_len0); break; case ETHERNET_TYPE_IP6: ASSERT (l2_emulations[sw_if_index0].enabled); ++ip6_hits; next0 = L2_EMULATION_NEXT_IP6; vlib_buffer_advance (b0, l2_len0); default: break; } } if (PREDICT_TRUE (!(h1[0] & 0x1))) { switch (ether_type1) { case ETHERNET_TYPE_IP4: ASSERT (l2_emulations[sw_if_index1].enabled); ++ip4_hits; next1 = L2_EMULATION_NEXT_IP4; vlib_buffer_advance (b1, l2_len1); break; case ETHERNET_TYPE_IP6: ASSERT (l2_emulations[sw_if_index1].enabled); ++ip6_hits; next1 = L2_EMULATION_NEXT_IP6; vlib_buffer_advance (b1, l2_len1); default: break; } } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { l2_emulation_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->extracted = (next0 != ~0); } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { l2_emulation_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->extracted = (next1 != ~0); } /* Determine the next node and remove ourself from bitmap */ if (PREDICT_TRUE (next0 == ~0)) next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next, L2INPUT_FEAT_L2_EMULATION); /* Determine the next node and remove ourself from bitmap */ if (PREDICT_TRUE (next1 == ~0)) next1 = vnet_l2_feature_next (b1, em->l2_input_feat_next, L2INPUT_FEAT_L2_EMULATION); vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t *b0; u32 sw_if_index0; u16 ether_type0; u32 next0 = ~0; u8 l2_len0; u32 bi0; u8 *h0; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); l2_len0 = vnet_buffer (b0)->l2.l2_len; h0 = vlib_buffer_get_current (b0); ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2)); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; /* * only extract unicast */ if (PREDICT_TRUE (!(h0[0] & 0x1))) { switch (ether_type0) { case ETHERNET_TYPE_IP4: ASSERT (l2_emulations[sw_if_index0].enabled); ++ip4_hits; next0 = L2_EMULATION_NEXT_IP4; vlib_buffer_advance (b0, l2_len0); break; case ETHERNET_TYPE_IP6: ASSERT (l2_emulations[sw_if_index0].enabled); ++ip6_hits; next0 = L2_EMULATION_NEXT_IP6; vlib_buffer_advance (b0, l2_len0); default: break; } } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { l2_emulation_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->extracted = (next0 != ~0); } /* Determine the next node and remove ourself from bitmap */ if (PREDICT_TRUE (next0 == ~0)) next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next, L2INPUT_FEAT_L2_EMULATION); /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, node->node_index, L2_EMULATION_ERROR_IP4, ip4_hits); vlib_node_increment_counter (vm, node->node_index, L2_EMULATION_ERROR_IP6, ip6_hits); return frame->n_vectors; } /* packet trace format function */ static u8 * format_l2_emulation_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 *); l2_emulation_trace_t *t = va_arg (*args, l2_emulation_trace_t *); s = format (s, "l2-emulation: %s", (t->extracted ? "yes" : "no")); return s; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (l2_emulation_node) = { .function = l2_emulation_node_fn, .name = "l2-emulation", .vector_size = sizeof (u32), .format_trace = format_l2_emulation_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(l2_emulation_error_strings), .error_strings = l2_emulation_error_strings, .n_next_nodes = L2_EMULATION_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [L2_EMULATION_NEXT_IP4] = "ip4-input", [L2_EMULATION_NEXT_IP6] = "ip6-input", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (l2_emulation_node, l2_emulation_node_fn); static clib_error_t * l2_emulation_init (vlib_main_t * vm) { l2_emulation_main_t *em = &l2_emulation_main; /* Initialize the feature next-node indexes */ feat_bitmap_init_next_nodes (vm, l2_emulation_node.index, L2INPUT_N_FEAT, l2input_get_feat_names (), em->l2_input_feat_next); return 0; } VLIB_INIT_FUNCTION (l2_emulation_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */