2 * Copyright (c) 2015 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.
16 * ip4/tcp_packet.h: TCP packet format (see RFC 793)
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef included_tcp_packet_h
41 #define included_tcp_packet_h
43 /* TCP flags bit 0 first. */
44 #define foreach_tcp_flag \
56 #define _(f) TCP_FLAG_BIT_##f,
61 #define _(f) TCP_FLAG_##f = 1 << TCP_FLAG_BIT_##f,
68 /* Source and destination port. */
79 u16 src_port, dst_port;
82 /* Sequence and acknowledgment number. */
83 u32 seq_number, ack_number;
85 /* Size of TCP header in 32-bit units plus 4 reserved bits. */
86 u8 tcp_header_u32s_and_reserved;
88 /* see foreach_tcp_flag for enumation of tcp flags. */
91 /* Current window advertised by sender.
92 This is the number of bytes sender is willing to receive
96 /* Checksum of TCP pseudo header and data. */
103 tcp_header_bytes (tcp_header_t * t)
105 return (t->tcp_header_u32s_and_reserved >> 4) * sizeof (u32);
109 typedef enum tcp_option_type
114 TCP_OPTION_WINDOW_SCALE = 3,
115 TCP_OPTION_SACK_PERMITTED = 4,
116 TCP_OPTION_SACK_BLOCK = 5,
117 TCP_OPTION_TIME_STAMP = 8,
120 /* All except NOP and END have 1 byte length field. */
123 tcp_option_type_t type:8;
125 /* Length of this option in bytes. */
127 } tcp_option_with_length_t;
129 #endif /* included_tcp_packet_h */
133 * fd.io coding-style-patch-verification: ON
136 * eval: (c-set-style "gnu")