/* * l2e_node.c : l2 emulation node * * Copyright (c) 2019 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> #include <vnet/l2/feat_bitmap.h> #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; /* 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; } VLIB_NODE_FN (l2_emulation_node) (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 (em->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 (em->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 (em->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 (em->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 (em->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 (em->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; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (l2_emulation_node) = { .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* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */