vpp - Vector Packet Processing

Age	Commit message (Expand)	Author	Files	Lines
2021-11-16	docs: consume fd.io version list	Nathan Skrzypczak	1	-0/+33

/* * Copyright (c) 2018 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. */ /** * @brief Handle IPv4 header options in the data-path */ #include <vnet/ip/ip.h> typedef enum ip4_options_next_t_ { IP4_OPTIONS_NEXT_PUNT, IP4_OPTIONS_NEXT_LOCAL, IP4_OPTIONS_N_NEXT, } ip4_options_next_t; typedef struct ip4_options_trace_t_ { u8 option[4]; } ip4_options_trace_t; VLIB_NODE_FN (ip4_options_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { uword n_left_from, n_left_to_next, next_index; u32 *from, *to_next; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = 0; while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); /* * IP options packets, when properly used, are very low rate, * so this code is not dual-looped for extra performance. */ while (n_left_from > 0 && n_left_to_next > 0) { ip4_options_next_t next; ip4_header_t *ip4; vlib_buffer_t *b; u8 *options; u32 bi; bi = from[0]; from += 1; n_left_from -= 1; to_next[0] = bi; to_next += 1; n_left_to_next -= 1; b = vlib_get_buffer (vm, bi); ip4 = vlib_buffer_get_current (b); next = IP4_OPTIONS_NEXT_PUNT; options = (u8 *) (ip4 + 1); /* * mask out the copy flag to leave the option type */ switch (options[0] & 0x7f) { case IP4_ROUTER_ALERT_OPTION: /* * if it's an IGMP packet, pass up the local stack */ if (IP_PROTOCOL_IGMP == ip4->protocol) { next = IP4_OPTIONS_NEXT_LOCAL; } break; default: break; } if (b->flags & VLIB_BUFFER_IS_TRACED) { ip4_options_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t)); clib_memcpy (t->option, options, 4); } vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi, next); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } u8 * format_ip4_options_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 *); ip4_options_trace_t *t = va_arg (*args, ip4_options_trace_t *); u32 indent = format_get_indent (s); s = format (s, "%Uoption:[0x%x,0x%x,0x%x,0x%x]", format_white_space, indent, t->option[0], t->option[1], t->option[2], t->option[3]); return s; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_options_node) = { .name = "ip4-options", .vector_size = sizeof (u32), .n_next_nodes = IP4_OPTIONS_N_NEXT, .next_nodes = { [IP4_OPTIONS_NEXT_PUNT] = "ip4-punt", [IP4_OPTIONS_NEXT_LOCAL] = "ip4-local", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_options_trace, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */