1 | /**
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2 | * @file
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3 | * TCP protocol definitions
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Adam Dunkels <adam@sics.se>
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35 | *
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36 | */
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37 | #ifndef LWIP_HDR_PROT_TCP_H
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38 | #define LWIP_HDR_PROT_TCP_H
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39 |
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40 | #include "lwip/arch.h"
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41 |
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42 | #ifdef __cplusplus
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43 | extern "C" {
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44 | #endif
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45 |
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46 | /* Length of the TCP header, excluding options. */
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47 | #define TCP_HLEN 20
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48 |
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49 | /* Fields are (of course) in network byte order.
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50 | * Some fields are converted to host byte order in tcp_input().
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51 | */
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52 | #ifdef PACK_STRUCT_USE_INCLUDES
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53 | # include "arch/bpstruct.h"
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54 | #endif
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55 | PACK_STRUCT_BEGIN
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56 | struct tcp_hdr {
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57 | PACK_STRUCT_FIELD(u16_t src);
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58 | PACK_STRUCT_FIELD(u16_t dest);
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59 | PACK_STRUCT_FIELD(u32_t seqno);
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60 | PACK_STRUCT_FIELD(u32_t ackno);
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61 | PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
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62 | PACK_STRUCT_FIELD(u16_t wnd);
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63 | PACK_STRUCT_FIELD(u16_t chksum);
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64 | PACK_STRUCT_FIELD(u16_t urgp);
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65 | } PACK_STRUCT_STRUCT;
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66 | PACK_STRUCT_END
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67 | #ifdef PACK_STRUCT_USE_INCLUDES
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68 | # include "arch/epstruct.h"
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69 | #endif
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70 |
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71 | /* TCP header flags bits */
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72 | #define TCP_FIN 0x01U
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73 | #define TCP_SYN 0x02U
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74 | #define TCP_RST 0x04U
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75 | #define TCP_PSH 0x08U
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76 | #define TCP_ACK 0x10U
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77 | #define TCP_URG 0x20U
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78 | #define TCP_ECE 0x40U
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79 | #define TCP_CWR 0x80U
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80 | /* Valid TCP header flags */
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81 | #define TCP_FLAGS 0x3fU
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82 |
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83 | #define TCP_MAX_OPTION_BYTES 40
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84 |
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85 | #define TCPH_HDRLEN(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) >> 12))
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86 | #define TCPH_HDRLEN_BYTES(phdr) ((u8_t)(TCPH_HDRLEN(phdr) << 2))
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87 | #define TCPH_FLAGS(phdr) ((u8_t)((lwip_ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)))
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88 |
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89 | #define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = lwip_htons(((len) << 12) | TCPH_FLAGS(phdr))
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90 | #define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS(~TCP_FLAGS)) | lwip_htons(flags))
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91 | #define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = (u16_t)(lwip_htons((u16_t)((len) << 12) | (flags)))
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92 |
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93 | #define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | lwip_htons(flags))
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94 | #define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags & ~lwip_htons(flags))
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95 |
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96 | #ifdef __cplusplus
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97 | }
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98 | #endif
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99 |
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100 | #endif /* LWIP_HDR_PROT_TCP_H */
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