UbixOS V2 2.0

tcp.h
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1
6 /*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37 #ifndef LWIP_HDR_PROT_TCP_H
38 #define LWIP_HDR_PROT_TCP_H
39
40 #include "net/arch.h"
41
42 #ifdef __cplusplus
43 extern "C" {
44 #endif
45
46 /* Length of the TCP header, excluding options. */
47 #define TCP_HLEN 20
48
49 /* Fields are (of course) in network byte order.
50 * Some fields are converted to host byte order in tcp_input().
51 */
52 #ifdef PACK_STRUCT_USE_INCLUDES
53 # include "arch/bpstruct.h"
54 #endif
55 PACK_STRUCT_BEGIN
56 struct tcp_hdr {
57 PACK_STRUCT_FIELD(u16_t src);
58 PACK_STRUCT_FIELD(u16_t dest);
59 PACK_STRUCT_FIELD(u32_t seqno);
60 PACK_STRUCT_FIELD(u32_t ackno);
61 PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
62 PACK_STRUCT_FIELD(u16_t wnd);
63 PACK_STRUCT_FIELD(u16_t chksum);
64 PACK_STRUCT_FIELD(u16_t urgp);
65 } PACK_STRUCT_STRUCT;
66 PACK_STRUCT_END
67 #ifdef PACK_STRUCT_USE_INCLUDES
68 # include "arch/epstruct.h"
69 #endif
70
71 /* TCP header flags bits */
72 #define TCP_FIN 0x01U
73 #define TCP_SYN 0x02U
74 #define TCP_RST 0x04U
75 #define TCP_PSH 0x08U
76 #define TCP_ACK 0x10U
77 #define TCP_URG 0x20U
78 #define TCP_ECE 0x40U
79 #define TCP_CWR 0x80U
80 /* Valid TCP header flags */
81 #define TCP_FLAGS 0x3fU
82
83 #define TCPH_HDRLEN(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) >> 12))
84 #define TCPH_FLAGS(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS))
85
86 #define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = lwip_htons(((len) << 12) | TCPH_FLAGS(phdr))
87 #define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS(~TCP_FLAGS)) | lwip_htons(flags))
88 #define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = (u16_t)(lwip_htons((u16_t)((len) << 12) | (flags)))
89
90 #define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | lwip_htons(flags))
91 #define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags & ~lwip_htons(flags))
92
93 #ifdef __cplusplus
94 }
95 #endif
96
97 #endif /* LWIP_HDR_PROT_TCP_H */
u16_t
uint16_t u16_t
Definition: arch.h:124
u32_t
uint32_t u32_t
Definition: arch.h:126
PACK_STRUCT_STRUCT
PACK_STRUCT_BEGIN struct tcp_hdr PACK_STRUCT_STRUCT
arch.h
PACK_STRUCT_BEGIN
#define PACK_STRUCT_BEGIN
Definition: cc.h:8
tcp_hdr
Definition: tcp.h:56
tcp_hdr::PACK_STRUCT_FIELD
PACK_STRUCT_FIELD(u16_t src)
PACK_STRUCT_END
#define PACK_STRUCT_END
Definition: cc.h:9