/* * 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. */ /* * llc_node.c: llc 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 <vlib/vlib.h> #include <vnet/pg/pg.h> #include <vnet/llc/llc.h> #define foreach_llc_input_next \ _ (PUNT, "error-punt") \ _ (DROP, "error-drop") typedef enum { #define _(s,n) LLC_INPUT_NEXT_##s, foreach_llc_input_next #undef _ LLC_INPUT_N_NEXT, } llc_input_next_t; typedef struct { u8 packet_data[32]; } llc_input_trace_t; static u8 * format_llc_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 *); llc_input_trace_t *t = va_arg (*va, llc_input_trace_t *); s = format (s, "%U", format_llc_header, t->packet_data); return s; } static uword llc_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { llc_main_t *lm = &llc_main; u32 n_left_from, next_index, *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 (llc_input_trace_t)); 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; llc_header_t *h0, *h1; u8 next0, next1, len0, len1, 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 = (void *) (b0->data + b0->current_data); h1 = (void *) (b1->data + b1->current_data); len0 = llc_header_length (h0); len1 = llc_header_length (h1); b0->current_data += len0; b1->current_data += len1; b0->current_length -= len0; b1->current_length -= len1; next0 = lm->input_next_by_protocol[h0->dst_sap]; next1 = lm->input_next_by_protocol[h1->dst_sap]; b0->error = node->errors[next0 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE]; b1->error = node->errors[next1 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE]; enqueue_code = (next0 != next_index) + 2 * (next1 != next_index); 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, next0, bi0); break; case 2: /* A A B */ to_next -= 1; n_left_to_next += 1; vlib_set_next_frame_buffer (vm, node, next1, 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, next0, bi0); vlib_set_next_frame_buffer (vm, node, next1, bi1); if (next0 == next1) { vlib_put_next_frame (vm, node, next_index, n_left_to_next); next_index = next1; 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; llc_header_t *h0; u8 next0, len0; 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 = (void *) (b0->data + b0->current_data); len0 = llc_header_length (h0); b0->current_data += len0; b0->current_length -= len0; next0 = lm->input_next_by_protocol[h0->dst_sap]; b0->error = node->errors[next0 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE]; /* Sent packet to wrong next? */ if (PREDICT_FALSE (next0 != next_index)) { /* Return old frame; remove incorrectly enqueued packet. */ vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1); /* Send to correct next. */ next_index = next0; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); to_next[0] = bi0; to_next += 1; n_left_to_next -= 1; } } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return from_frame->n_vectors; } static char *llc_error_strings[] = { #define _(f,s) s, foreach_llc_error #undef _ }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE (llc_input_node) = { .function = llc_input, .name = "llc-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = LLC_N_ERROR, .error_strings = llc_error_strings, .n_next_nodes = LLC_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [LLC_INPUT_NEXT_##s] = n, foreach_llc_input_next #undef _ }, .format_buffer = format_llc_header_with_length, .format_trace = format_llc_input_trace, .unformat_buffer = unformat_llc_header, }; /* *INDENT-ON* */ static clib_error_t * llc_input_init (vlib_main_t * vm) { llc_main_t *lm = &llc_main; { clib_error_t *error = vlib_call_init_function (vm, llc_init); if (error) clib_error_report (error); } llc_setup_node (vm, llc_input_node.index); { int i; for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++) lm->input_next_by_protocol[i] = LLC_INPUT_NEXT_DROP; } return 0; } VLIB_INIT_FUNCTION (llc_input_init); void llc_register_input_protocol (vlib_main_t * vm, llc_protocol_t protocol, u32 node_index) { llc_main_t *lm = &llc_main; llc_protocol_info_t *pi; { clib_error_t *error = vlib_call_init_function (vm, llc_input_init); if (error) clib_error_report (error); /* Otherwise, osi_input_init will wipe out e.g. the snap init */ error = vlib_call_init_function (vm, osi_input_init); if (error) clib_error_report (error); } pi = llc_get_protocol_info (lm, protocol); pi->node_index = node_index; pi->next_index = vlib_node_add_next (vm, llc_input_node.index, node_index); lm->input_next_by_protocol[protocol] = pi->next_index; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */