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/*
* Copyright (c) 2015-2019 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.
*/
/*
* tcp/tcp_format.c: tcp formatting
*
* Copyright (c) 2008 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 <vnet/ip/ip.h>
#include <vnet/tcp/tcp.h>
u8 *
format_tcp_flags (u8 * s, va_list * args)
{
int flags = va_arg (*args, int);
s = format (s, "0x%02x", flags);
#define _(f) if (flags & TCP_FLAG_##f) s = format (s, " %s", #f);
foreach_tcp_flag
#undef _
return s;
}
u8 *
format_tcp_options (u8 *s, va_list *args)
{
tcp_options_t *opts = va_arg (*args, tcp_options_t *);
u32 indent, n_opts = 0;
int i;
if (!opts->flags)
return s;
indent = format_get_indent (s);
indent += 2;
s = format (s, "options:\n%U", format_white_space, indent);
if (tcp_opts_mss (opts))
{
s = format (s, "mss %d", opts->mss);
n_opts++;
}
if (tcp_opts_wscale (opts))
{
s = format (s, "%swindow scale %d", n_opts > 0 ? ", " : "",
format_white_space, indent, opts->wscale);
n_opts++;
}
if (tcp_opts_tstamp (opts))
{
s = format (s, "%stimestamp %d, echo/reflected timestamp",
n_opts > 0 ? ", " : "", format_white_space, indent,
opts->tsval, opts->tsecr);
n_opts++;
}
if (tcp_opts_sack_permitted (opts))
{
s = format (s, "%ssack permitted", n_opts > 0 ? ", " : "",
format_white_space, indent);
n_opts++;
}
if (tcp_opts_sack (opts))
{
s = format (s, "%ssacks:", n_opts > 0 ? ", " : "", format_white_space,
indent);
for (i = 0; i < opts->n_sack_blocks; ++i)
{
s = format (s, "\n%Ublock %d: start %d, end %d", format_white_space,
indent + 2, i + 1, opts->sacks[i].start,
opts->sacks[i].end);
}
n_opts++;
}
return s;
}
/* Format TCP header. */
u8 *
format_tcp_header (u8 * s, va_list * args)
{
tcp_header_t *tcp = va_arg (*args, tcp_header_t *);
u32 max_header_bytes = va_arg (*args, u32);
tcp_options_t opts = { .flags = 0 };
u32 header_bytes;
u32 indent;
/* Nothing to do. */
if (max_header_bytes < sizeof (tcp[0]))
return format (s, "TCP header truncated");
indent = format_get_indent (s);
indent += 2;
header_bytes = tcp_header_bytes (tcp);
s = format (s, "TCP: %d -> %d", clib_net_to_host_u16 (tcp->src),
clib_net_to_host_u16 (tcp->dst));
s = format (s, "\n%Useq. 0x%08x ack 0x%08x", format_white_space, indent,
clib_net_to_host_u32 (tcp->seq_number),
clib_net_to_host_u32 (tcp->ack_number));
s = format (s, "\n%Uflags %U, tcp header: %d bytes", format_white_space,
indent, format_tcp_flags, tcp->flags, header_bytes);
s = format (s, "\n%Uwindow %d, checksum 0x%04x", format_white_space, indent,
clib_net_to_host_u16 (tcp->window),
clib_net_to_host_u16 (tcp->checksum));
if (header_bytes > max_header_bytes)
s = format (s, "\n%Uoptions: truncated", format_white_space, indent);
else if (tcp_options_parse (tcp, &opts, tcp_is_syn (tcp)) < 0)
s = format (s, "\n%Uoptions: parsing failed", format_white_space, indent);
else
s = format (s, "\n%U%U", format_white_space, indent, format_tcp_options,
&opts);
/* Recurse into next protocol layer. */
if (max_header_bytes != 0 && header_bytes < max_header_bytes)
{
ip_main_t *im = &ip_main;
tcp_udp_port_info_t *pi;
pi = ip_get_tcp_udp_port_info (im, tcp->dst);
if (pi && pi->format_header)
s = format (s, "\n%U%U", format_white_space, indent - 2,
pi->format_header,
/* next protocol header */ (void *) tcp + header_bytes,
max_header_bytes - header_bytes);
}
return s;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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