pico_tcp.h

00001 /*********************************************************************
00002 PicoTCP. Copyright (c) 2012 TASS Belgium NV. Some rights reserved.
00003 See LICENSE and COPYING for usage.
00004 
00005 .
00006 
00007 *********************************************************************/
00008 #ifndef _INCLUDE_PICO_TCP
00009 #define _INCLUDE_PICO_TCP
00010 #include "pico_addressing.h"
00011 #include "pico_protocol.h"
00012 #include "pico_socket.h"
00013 
00014 extern struct pico_protocol pico_proto_tcp;
00015 
00016 struct __attribute__((packed)) pico_tcp_hdr {
00017   struct pico_trans trans;
00018   uint32_t seq;
00019   uint32_t ack;
00020   uint8_t  len;
00021   uint8_t flags;
00022   uint16_t  rwnd;
00023   uint16_t crc;
00024   uint16_t urgent;
00025 };
00026 
00027 struct __attribute__((packed)) tcp_pseudo_hdr_ipv4
00028 {
00029   struct pico_ip4 src;
00030   struct pico_ip4 dst;
00031   uint16_t tcp_len;
00032   uint8_t res;
00033   uint8_t proto;
00034 };
00035 
00036 #define PICO_TCPHDR_SIZE 20
00037 #define PICO_SIZE_TCPOPT_SYN 20
00038 #define PICO_SIZE_TCPHDR (sizeof(struct pico_tcp_hdr))
00039 
00040 #define PICO_TCP_DEFAULT_MSS 1444
00041 
00042 
00043 
00044 /* TCP options */
00045 #define PICO_TCP_OPTION_END         0x00
00046 #define PICO_TCPOPTLEN_END        1
00047 #define PICO_TCP_OPTION_NOOP        0x01
00048 #define PICO_TCPOPTLEN_NOOP       1
00049 #define PICO_TCP_OPTION_MSS         0x02
00050 #define PICO_TCPOPTLEN_MSS        4
00051 #define PICO_TCP_OPTION_WS          0x03
00052 #define PICO_TCPOPTLEN_WS         3
00053 #define PICO_TCP_OPTION_SACK_OK        0x04
00054 #define PICO_TCPOPTLEN_SACK_OK       2
00055 #define PICO_TCP_OPTION_SACK        0x05
00056 #define PICO_TCPOPTLEN_SACK       2 /* Plus the block */
00057 #define PICO_TCP_OPTION_TIMESTAMP   0x08
00058 #define PICO_TCPOPTLEN_TIMESTAMP  10
00059 
00060 /* TCP flags */
00061 #define PICO_TCP_FIN 0x01
00062 #define PICO_TCP_SYN 0x02
00063 #define PICO_TCP_RST 0x04
00064 #define PICO_TCP_PSH 0x08
00065 #define PICO_TCP_ACK 0x10
00066 #define PICO_TCP_URG 0x20
00067 #define PICO_TCP_ECN 0x40
00068 #define PICO_TCP_CWR 0x80
00069 
00070 
00071 
00072 struct __attribute__((packed)) pico_tcp_option
00073 {
00074   uint8_t kind;
00075   uint8_t len;
00076 #if 0
00077   union {
00078    uint16_t mss;
00079     uint8_t wshift;
00080     struct {
00081       uint32_t tsval;
00082       uint32_t tsecr;
00083     } timestamp;
00084   } data;
00085 #endif
00086 };
00087 
00088 struct pico_socket *pico_tcp_open(void);
00089 int pico_tcp_read(struct pico_socket *s, void *buf, int len);
00090 int pico_tcp_initconn(struct pico_socket *s);
00091 int pico_tcp_input(struct pico_socket *s, struct pico_frame *f);
00092 uint16_t pico_tcp_checksum_ipv4(struct pico_frame *f);
00093 int pico_tcp_overhead(struct pico_socket *s);
00094 int pico_tcp_output(struct pico_socket *s, int loop_score);
00095 int pico_tcp_queue_in_is_empty(struct pico_socket *s);
00096 int pico_tcp_reply_rst(struct pico_frame *f);
00097 
00098 #endif