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/*
* 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)
{
ip_lookup_set_buffer_fib_index (
ip4_main.fib_index_by_sw_if_index, b);
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_fast (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:
*/
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