/* * Copyright (c) 2015 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 <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/pg/pg.h> #include <vnet/ethernet/ethernet.h> #include <vnet/feature/feature.h> #include <vppinfra/error.h> typedef struct { /* vector of dispositions, indexed by rx_sw_if_index */ u32 *tx_next_by_rx_sw_if_index; u32 *tx_sw_if_index_by_rx_sw_if_index; /* convenience variables */ vlib_main_t *vlib_main; vnet_main_t *vnet_main; } l2_patch_main_t; typedef struct { u32 rx_sw_if_index; u32 tx_sw_if_index; } l2_patch_trace_t; /* packet trace format function */ static u8 * format_l2_patch_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_patch_trace_t *t = va_arg (*args, l2_patch_trace_t *); s = format (s, "L2_PATCH: rx %d tx %d", t->rx_sw_if_index, t->tx_sw_if_index); return s; } l2_patch_main_t l2_patch_main; static vlib_node_registration_t l2_patch_node; #define foreach_l2_patch_error \ _(PATCHED, "L2 patch packets") \ _(DROPPED, "L2 patch misconfigured drops") typedef enum { #define _(sym,str) L2_PATCH_ERROR_##sym, foreach_l2_patch_error #undef _ L2_PATCH_N_ERROR, } l2_patch_error_t; static char *l2_patch_error_strings[] = { #define _(sym,string) string, foreach_l2_patch_error #undef _ }; typedef enum { L2_PATCH_NEXT_DROP, L2_PATCH_N_NEXT, } l2_patch_next_t; static uword l2_patch_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; l2_patch_next_t next_index; l2_patch_main_t *l2pm = &l2_patch_main; vlib_node_t *n = vlib_get_node (vm, l2_patch_node.index); u32 node_counter_base_index = n->error_heap_index; vlib_error_main_t *em = &vm->error_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; 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) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; u32 sw_if_index0, sw_if_index1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); /* So stupid / simple, we don't need to prefetch data */ } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0); ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0); ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index1] != ~0); ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1] != ~0); next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0]; next1 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index1]; vnet_buffer (b0)->sw_if_index[VLIB_TX] = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; vnet_buffer (b1)->sw_if_index[VLIB_TX] = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1]; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { l2_patch_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->rx_sw_if_index = sw_if_index0; t->tx_sw_if_index = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { l2_patch_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->rx_sw_if_index = sw_if_index1; t->tx_sw_if_index = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1]; } } /* verify speculative enqueues, maybe switch current next frame */ 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) { u32 bi0; vlib_buffer_t *b0; u32 next0; u32 sw_if_index0; /* speculatively enqueue b0 to the current next frame */ 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); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0); ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0); next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0]; vnet_buffer (b0)->sw_if_index[VLIB_TX] = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { l2_patch_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->rx_sw_if_index = sw_if_index0; t->tx_sw_if_index = l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; } } /* 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); } em->counters[node_counter_base_index + L2_PATCH_ERROR_PATCHED] += frame->n_vectors; return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (l2_patch_node, static) = { .function = l2_patch_node_fn, .name = "l2-patch", .vector_size = sizeof (u32), .format_trace = format_l2_patch_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(l2_patch_error_strings), .error_strings = l2_patch_error_strings, .n_next_nodes = L2_PATCH_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [L2_PATCH_NEXT_DROP] = "error-drop", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (l2_patch_node, l2_patch_node_fn) int vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index, int is_add) { l2_patch_main_t *l2pm = &l2_patch_main; vnet_hw_interface_t *rxhi, *txhi; u32 tx_next_index; /* * We assume that the API msg handler has used 2x VALIDATE_SW_IF_INDEX * macros... */ rxhi = vnet_get_sup_hw_interface (l2pm->vnet_main, rx_sw_if_index); /* Make sure caller didn't pass a vlan subif, etc. */ if (rxhi->sw_if_index != rx_sw_if_index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; txhi = vnet_get_sup_hw_interface (l2pm->vnet_main, tx_sw_if_index); if (txhi->sw_if_index != tx_sw_if_index) return VNET_API_ERROR_INVALID_SW_IF_INDEX_2; if (is_add) { tx_next_index = vlib_node_add_next (l2pm->vlib_main, l2_patch_node.index, txhi->output_node_index); vec_validate_init_empty (l2pm->tx_next_by_rx_sw_if_index, rx_sw_if_index, ~0); l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = tx_next_index; vec_validate_init_empty (l2pm->tx_sw_if_index_by_rx_sw_if_index, rx_sw_if_index, ~0); l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = txhi->sw_if_index; ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index, ETHERNET_INTERFACE_FLAG_ACCEPT_ALL); vnet_feature_enable_disable ("device-input", "l2-patch", rxhi->hw_if_index, 1, 0, 0); } else { ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index, 0 /* disable promiscuous mode */ ); vnet_feature_enable_disable ("device-input", "l2-patch", rxhi->hw_if_index, 0, 0, 0); if (vec_len (l2pm->tx_next_by_rx_sw_if_index) > rx_sw_if_index) { l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = ~0; l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = ~0; } } return 0; } static clib_error_t * test_patch_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { l2_patch_main_t *l2pm = &l2_patch_main; unformat_input_t _line_input, *line_input = &_line_input; u32 rx_sw_if_index, tx_sw_if_index; int rv; int rx_set = 0; int tx_set = 0; int is_add = 1; clib_error_t *error = NULL; /* Get a line of input. */ if (!unformat_user (input, unformat_line_input, line_input)) return 0; while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { if (unformat (line_input, "rx %U", unformat_vnet_sw_interface, l2pm->vnet_main, &rx_sw_if_index)) rx_set = 1; else if (unformat (line_input, "tx %U", unformat_vnet_sw_interface, l2pm->vnet_main, &tx_sw_if_index)) tx_set = 1; else if (unformat (line_input, "del")) is_add = 0; else break; } if (rx_set == 0) { error = clib_error_return (0, "rx interface not set"); goto done; } if (tx_set == 0) { error = clib_error_return (0, "tx interface not set"); goto done; } rv = vnet_l2_patch_add_del (rx_sw_if_index, tx_sw_if_index, is_add); switch (rv) { case 0: break; case VNET_API_ERROR_INVALID_SW_IF_INDEX: error = clib_error_return (0, "rx interface not a physical port"); goto done; case VNET_API_ERROR_INVALID_SW_IF_INDEX_2: error = clib_error_return (0, "tx interface not a physical port"); goto done; default: error = clib_error_return (0, "WARNING: vnet_l2_patch_add_del returned %d", rv); goto done; } done: unformat_free (line_input); return error; } /*? * Create or delete a Layer 2 patch. * * @cliexpar * @cliexstart{test l2patch rx <intfc> tx <intfc> [del]} * @cliexend * @todo This is incomplete. This needs a detailed description and a * practical example. ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (test_patch_command, static) = { .path = "test l2patch", .short_help = "test l2patch rx <intfc> tx <intfc> [del]", .function = test_patch_command_fn, }; /* *INDENT-ON* */ /** Display the contents of the l2patch table. */ static clib_error_t * show_l2patch (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { l2_patch_main_t *l2pm = &l2_patch_main; u32 rx_sw_if_index; u32 no_entries = 1; ASSERT (vec_len (l2pm->tx_next_by_rx_sw_if_index) == vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index)); for (rx_sw_if_index = 0; rx_sw_if_index < vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index); rx_sw_if_index++) { u32 tx_sw_if_index = l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index]; if (tx_sw_if_index != ~0) { no_entries = 0; vlib_cli_output (vm, "%26U -> %U", format_vnet_sw_if_index_name, l2pm->vnet_main, rx_sw_if_index, format_vnet_sw_if_index_name, l2pm->vnet_main, tx_sw_if_index); } } if (no_entries) vlib_cli_output (vm, "no l2patch entries"); return 0; } /*? * Show Layer 2 patch entries. * * @cliexpar * @cliexstart{show l2patch} * @cliexend * @todo This is incomplete. This needs a detailed description and a * practical example. ?*/ /* *INDENT-OFF* */ VLIB_CLI_COMMAND (show_l2patch_cli, static) = { .path = "show l2patch", .short_help = "Show l2 interface cross-connect entries", .function = show_l2patch, }; /* *INDENT-ON* */ clib_error_t * l2_patch_init (vlib_main_t * vm) { l2_patch_main_t *mp = &l2_patch_main; mp->vlib_main = vm; mp->vnet_main = vnet_get_main (); return 0; } VLIB_INIT_FUNCTION (l2_patch_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */