2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 * @brief Handle IPv4 header options in the data-path
20 #include <vnet/ip/ip.h>
22 typedef enum ip4_options_next_t_
24 IP4_OPTIONS_NEXT_PUNT,
25 IP4_OPTIONS_NEXT_LOCAL,
29 typedef struct ip4_options_trace_t_
32 } ip4_options_trace_t;
34 VLIB_NODE_FN (ip4_options_node) (vlib_main_t * vm,
35 vlib_node_runtime_t * node,
38 uword n_left_from, n_left_to_next, next_index;
41 from = vlib_frame_vector_args (frame);
42 n_left_from = frame->n_vectors;
45 while (n_left_from > 0)
47 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
50 * IP options packets, when properly used, are very low rate,
51 * so this code is not dual-looped for extra performance.
53 while (n_left_from > 0 && n_left_to_next > 0)
55 ip4_options_next_t next;
68 b = vlib_get_buffer (vm, bi);
69 ip4 = vlib_buffer_get_current (b);
70 next = IP4_OPTIONS_NEXT_PUNT;
72 options = (u8 *) (ip4 + 1);
75 * mask out the copy flag to leave the option type
77 switch (options[0] & 0x7f)
79 case IP4_ROUTER_ALERT_OPTION:
81 * check the option length
86 * if it's an IGMP packet, pass up the local stack
88 if (IP_PROTOCOL_IGMP == ip4->protocol)
90 ip_lookup_set_buffer_fib_index (
91 ip4_main.fib_index_by_sw_if_index, b);
92 next = IP4_OPTIONS_NEXT_LOCAL;
99 if (b->flags & VLIB_BUFFER_IS_TRACED)
101 ip4_options_trace_t *t =
102 vlib_add_trace (vm, node, b, sizeof (*t));
104 clib_memcpy_fast (t->option, options, 4);
106 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
107 n_left_to_next, bi, next);
111 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
113 return frame->n_vectors;
117 format_ip4_options_trace (u8 * s, va_list * args)
119 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
120 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
121 ip4_options_trace_t *t = va_arg (*args, ip4_options_trace_t *);
122 u32 indent = format_get_indent (s);
124 s = format (s, "%Uoption:[0x%x,0x%x,0x%x,0x%x]",
125 format_white_space, indent,
126 t->option[0], t->option[1], t->option[2], t->option[3]);
130 VLIB_REGISTER_NODE (ip4_options_node) = {
131 .name = "ip4-options",
132 .vector_size = sizeof (u32),
134 .n_next_nodes = IP4_OPTIONS_N_NEXT,
136 [IP4_OPTIONS_NEXT_PUNT] = "ip4-punt",
137 [IP4_OPTIONS_NEXT_LOCAL] = "ip4-local",
139 .format_buffer = format_ip4_header,
140 .format_trace = format_ip4_options_trace,
144 * fd.io coding-style-patch-verification: ON
147 * eval: (c-set-style "gnu")