git.meshlink.io Git - utcp/blob - utcp_priv.h

   1 /*
   2     utcp.h -- Userspace TCP
   3     Copyright (C) 2014 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef UTCP_PRIV_H
  21 #define UTCP_PRIV_H
  22
  23 #define UTCP_INTERNAL
  24 #include "utcp.h"
  25
  26 #define PREP(l) char pkt[(l) + sizeof struct hdr]; struct hdr *hdr = &pkt;
  27
  28 #define SYN 1
  29 #define ACK 2
  30 #define FIN 4
  31 #define RST 8
  32
  33 #define DEFAULT_SNDBUFSIZE 4096
  34 #define DEFAULT_MAXSNDBUFSIZE 131072
  35
  36 struct hdr {
  37         uint16_t src; // Source port
  38         uint16_t dst; // Destination port
  39         uint32_t seq; // Sequence number
  40         uint32_t ack; // Acknowledgement number
  41         uint32_t wnd; // Window size
  42         uint16_t ctl; // Flags (SYN, ACK, FIN, RST)
  43         uint16_t aux; // other stuff
  44 };
  45
  46 enum state {
  47         CLOSED,
  48         LISTEN,
  49         SYN_SENT,
  50         SYN_RECEIVED,
  51         ESTABLISHED,
  52         FIN_WAIT_1,
  53         FIN_WAIT_2,
  54         CLOSE_WAIT,
  55         CLOSING,
  56         LAST_ACK,
  57         TIME_WAIT
  58 };
  59
  60 static const char *strstate[] __attribute__((unused)) = {
  61         [CLOSED] = "CLOSED",
  62         [LISTEN] = "LISTEN",
  63         [SYN_SENT] = "SYN_SENT",
  64         [SYN_RECEIVED] = "SYN_RECEIVED",
  65         [ESTABLISHED] = "ESTABLISHED",
  66         [FIN_WAIT_1] = "FIN_WAIT_1",
  67         [FIN_WAIT_2] = "FIN_WAIT_2",
  68         [CLOSE_WAIT] = "CLOSE_WAIT",
  69         [CLOSING] = "CLOSING",
  70         [LAST_ACK] = "LAST_ACK",
  71         [TIME_WAIT] = "TIME_WAIT"
  72 };
  73
  74 struct utcp_connection {
  75         void *priv;
  76         struct utcp *utcp;
  77
  78         bool reapable;
  79
  80         // Callbacks
  81
  82         utcp_recv_t recv;
  83
  84         // TCP State
  85
  86         uint16_t src;
  87         uint16_t dst;
  88         enum state state;
  89
  90         struct {
  91                 uint32_t una;
  92                 uint32_t nxt;
  93                 uint32_t wnd;
  94                 uint32_t iss;
  95
  96                 uint32_t last;
  97                 uint32_t cwnd;
  98         } snd;
  99
 100         struct {
 101                 uint32_t nxt;
 102                 uint32_t wnd;
 103                 uint32_t irs;
 104         } rcv;
 105
 106         int dupack;
 107
 108         // Timers
 109
 110         struct timeval conn_timeout;
 111         struct timeval rtrx_timeout;
 112
 113         // Send buffer
 114
 115         char *sndbuf;
 116         uint32_t sndbufsize;
 117         uint32_t maxsndbufsize;
 118
 119         // Per-socket options
 120
 121         bool nodelay;
 122         bool keepalive;
 123
 124         // Congestion avoidance state
 125
 126         struct timeval tlast;
 127         uint64_t bandwidth;
 128 };
 129
 130 struct utcp {
 131         void *priv;
 132
 133         // Callbacks
 134
 135         utcp_accept_t accept;
 136         utcp_pre_accept_t pre_accept;
 137         utcp_send_t send;
 138
 139         // Global socket options
 140
 141         uint16_t mtu;
 142         int timeout;
 143
 144         // Connection management
 145
 146         struct utcp_connection **connections;
 147         int nconnections;
 148         int nallocated;
 149 };
 150
 151 #endif