/* * 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. */ /* * hdlc_node.c: hdlc packet processing * * Copyright (c) 2010 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include #include #include #include #define foreach_hdlc_input_next \ _ (PUNT, "error-punt") \ _ (DROP, "error-drop") typedef enum { #define _(s,n) HDLC_INPUT_NEXT_##s, foreach_hdlc_input_next #undef _ HDLC_INPUT_N_NEXT, } hdlc_input_next_t; typedef struct { u8 packet_data[32]; } hdlc_input_trace_t; static u8 * format_hdlc_input_trace (u8 * s, va_list * va) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); hdlc_input_trace_t *t = va_arg (*va, hdlc_input_trace_t *); s = format (s, "%U", format_hdlc_header, t->packet_data); return s; } typedef struct { /* Sparse vector mapping hdlc protocol in network byte order to next index. */ u16 *next_by_protocol; u32 *sparse_index_by_next_index; } hdlc_input_runtime_t; static uword hdlc_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { hdlc_input_runtime_t *rt = (void *) node->runtime_data; u32 n_left_from, next_index, i_next, *from, *to_next; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; if (node->flags & VLIB_NODE_FLAG_TRACE) vlib_trace_frame_buffers_only (vm, node, from, n_left_from, sizeof (from[0]), sizeof (hdlc_input_trace_t)); next_index = node->cached_next_index; i_next = vec_elt (rt->sparse_index_by_next_index, 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; hdlc_header_t *h0, *h1; u32 i0, i1, len0, len1, protocol0, protocol1, enqueue_code; /* Prefetch next iteration. */ { vlib_buffer_t *b2, *b3; b2 = vlib_get_buffer (vm, from[2]); b3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (b2, LOAD); vlib_prefetch_buffer_header (b3, LOAD); CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD); CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD); } bi0 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); h0 = vlib_buffer_get_current (b0); h1 = vlib_buffer_get_current (b1); protocol0 = h0->protocol; protocol1 = h1->protocol; /* Add padding bytes for OSI protocols. */ len0 = sizeof (h0[0]); len1 = sizeof (h1[0]); len0 += protocol0 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi); len1 += protocol1 == clib_host_to_net_u16 (HDLC_PROTOCOL_osi); vlib_buffer_advance (b0, len0); vlib_buffer_advance (b1, len1); /* Index sparse array with network byte order. */ sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0, &i1); b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE]; b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? HDLC_ERROR_UNKNOWN_PROTOCOL : HDLC_ERROR_NONE]; enqueue_code = (i0 != i_next) + 2 * (i1 != i_next); if (PREDICT_FALSE (enqueue_code != 0)) { switch (enqueue_code) { case 1: /* A B A */ to_next[-2] = bi1; to_next -= 1; n_left_to_next += 1; vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0); break; case 2: /* A A B */ to_next -= 1; n_left_to_next += 1; vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1); break; case 3: /* A B B or A B C */ to_next -= 2; n_left_to_next += 2; vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i0), bi0); vlib_set_next_frame_buffer (vm, node, vec_elt (rt->next_by_protocol, i1), bi1); if (i0 == i1) { vlib_put_next_frame (vm, node, next_index, n_left_to_next); i_next = i1; next_index = vec_elt (rt->next_by_protocol, i_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) { u32 bi0; vlib_buffer_t *b0; hdlc_header_t *h0; u32 i0, len0, protocol0; 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); h0 = vlib_buffer_get_current (b0); protoc