From d792d9c01e60656cbfe1b0f1fd6a9b125f5dab0c Mon Sep 17 00:00:00 2001 From: Neale Ranns Date: Sat, 21 Oct 2017 10:53:20 -0700 Subject: BIER - see draft-ietf-bier-mpls-encapsulation-10 - midpoint, head and tail functions - supported payload protocols; IPv4 and IPv6 only. Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb Signed-off-by: Neale Ranns --- src/vnet/bier/bier_input.c | 175 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 src/vnet/bier/bier_input.c (limited to 'src/vnet/bier/bier_input.c') diff --git a/src/vnet/bier/bier_input.c b/src/vnet/bier/bier_input.c new file mode 100644 index 00000000000..88b37fc80c0 --- /dev/null +++ b/src/vnet/bier/bier_input.c @@ -0,0 +1,175 @@ +/* + * Copyright (c) 2016 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 + +typedef enum { +#define bier_error(n,s) BIER_INPUT_ERROR_##n, +#include +#undef bier_error + BIER_INPUT_N_ERROR, +} bier_input_error_t; + +static char * bier_error_strings[] = { +#define bier_error(n,s) s, +#include +#undef bier_error +}; + +typedef enum bier_input_next_t_ { + BIER_INPUT_NEXT_BIER_LOOKUP, + BIER_INPUT_NEXT_DROP, + BIER_INPUT_N_NEXT, +} bier_input_next_t; + +vlib_node_registration_t bier_input_node; + +/** + * @brief Packet trace recoed for a BIER output + */ +typedef struct bier_input_trace_t_ +{ + u32 next_index; + u32 bt_index; +} bier_input_trace_t; + +static int +bier_hdr_validate (bier_hdr_t *bier_hdr, + bier_hdr_len_id_t expected_length) +{ + /* + * checks: + * - the version field must be 1 + * - the header length matches the length expected + */ + if (PREDICT_FALSE((BIER_HDR_VERSION_1 != bier_hdr_get_version(bier_hdr)) || + (expected_length != bier_hdr_get_len_id(bier_hdr)))) { + return (0); + } + + return (1); +} + +static uword +bier_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + /* + * objection your honour! speculation! + */ + 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 > 0 && n_left_to_next > 0) + { + const bier_table_t *bt0; + vlib_buffer_t * b0; + bier_hdr_t * bh0; + u32 bi0, next0; + u32 bt_index0; + + 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); + bh0 = vlib_buffer_get_current (b0); + bier_hdr_ntoh(bh0); + + /* + * In the MPLS decap node we squirelled away the + * index for the BIER table as the tx adjacency + */ + bt_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX]; + bt0 = bier_table_get(bt_index0); + + if (PREDICT_TRUE(bier_hdr_validate(bh0, bt0->bt_id.bti_hdr_len))) + { + next0 = BIER_INPUT_NEXT_BIER_LOOKUP; + } else { + next0 = BIER_INPUT_NEXT_DROP; + b0->error = node->errors[BIER_INPUT_ERROR_INVALID_HEADER]; + } + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + bier_input_trace_t *tr; + + tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->next_index = next0; + tr->bt_index = bt_index0; + } + + 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, bier_input_node.index, + BIER_INPUT_ERROR_PKTS_VALID, + from_frame->n_vectors); + return (from_frame->n_vectors); +} + +static u8 * +format_bier_input_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 *); + bier_input_trace_t * t = va_arg (*args, bier_input_trace_t *); + + s = format (s, " next [%d], BIER Table index %d", + t->next_index, t->bt_index); + return s; +} + +VLIB_REGISTER_NODE (bier_input_node) = { + .function = bier_input, + .name = "bier-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = BIER_INPUT_N_ERROR, + .error_strings = bier_error_strings, + + .n_next_nodes = BIER_INPUT_N_NEXT, + .next_nodes = { + [BIER_INPUT_NEXT_BIER_LOOKUP] = "bier-lookup", + [BIER_INPUT_NEXT_DROP] = "bier-drop", + }, + + .format_trace = format_bier_input_trace, +}; -- cgit 1.2.3-korg