1#!/usr/sbin/dtrace -s 2/* 3 * Copyright (c) 2015 George V. Neville-Neil 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 * 29 * The tcpdebug D script uses the tcp:kernel::debug tracepoints 30 * to replicate the action of turning on TCPDEBUG in a kernel configuration. 31 * 32 * A TCP debug statement shows a connection's 33 * 34 * direction: input, output, user, drop 35 * state: CLOSED, LISTEN, SYN_SENT, SYN_RCVD, ESTABLISHED, 36 * CLOSE_WAIT, FIN_WAIT_1, CLOSING, LAST_ACK, FIN_WAIT_2,TIME_WAIT 37 * sequence: sequence space 38 * 39 * congestion: rcv_nxt, rcv_wnd, rcv_up, snd_una, snd_nxt, snx_max, 40 * snd_wl1, snd_wl2, snd_wnd 41 * 42 * NOTE: Only sockets with SO_DEBUG set will be shown. 43 * 44 * Usage: tcpdebug 45 */ 46 47#pragma D option quiet 48tcp:kernel::debug-input 49/args[0]->tcps_debug/ 50{ 51 seq = args[1]->tcp_seq; 52 ack = args[1]->tcp_ack; 53 len = args[2]->ip_plength - sizeof(struct tcphdr); 54 flags = args[1]->tcp_flags; 55 56 printf("%p %s: input [%xu..%xu]", arg0, 57 tcp_state_string[args[0]->tcps_state], seq, seq + len); 58 59 printf("@%x, urp=%x", ack, args[1]->tcp_urgent); 60 61 printf("%s", flags != 0 ? "<" : ""); 62 printf("%s", flags & TH_SYN ? "SYN," :""); 63 printf("%s", flags & TH_ACK ? "ACK," :""); 64 printf("%s", flags & TH_FIN ? "FIN," :""); 65 printf("%s", flags & TH_RST ? "RST," :""); 66 printf("%s", flags & TH_PUSH ? "PUSH," :""); 67 printf("%s", flags & TH_URG ? "URG," :""); 68 printf("%s", flags & TH_ECE ? "ECE," :""); 69 printf("%s", flags & TH_CWR ? "CWR" :""); 70 printf("%s", flags != 0 ? ">" : ""); 71 72 printf("\n"); 73 printf("\trcv_(nxt,wnd,up) (%x,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 74 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 75 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 76 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 77 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 78 79} 80 81tcp:kernel::debug-output 82/args[0]->tcps_debug/ 83{ 84 seq = args[1]->tcp_seq; 85 ack = args[1]->tcp_ack; 86 len = args[2]->ip_plength - 20; 87 88 printf("%p %s: output [%x..%x]", arg0, 89 tcp_state_string[args[0]->tcps_state], seq, seq + len); 90 91 printf("@%x, urp=%x", ack, args[1]->tcp_urgent); 92 93 printf("%s", flags != 0 ? "<" : ""); 94 printf("%s", flags & TH_SYN ? "SYN," :""); 95 printf("%s", flags & TH_ACK ? "ACK," :""); 96 printf("%s", flags & TH_FIN ? "FIN," :""); 97 printf("%s", flags & TH_RST ? "RST," :""); 98 printf("%s", flags & TH_PUSH ? "PUSH," :""); 99 printf("%s", flags & TH_URG ? "URG," :""); 100 printf("%s", flags & TH_ECE ? "ECE," :""); 101 printf("%s", flags & TH_CWR ? "CWR" :""); 102 printf("%s", flags != 0 ? ">" : ""); 103 104 printf("\n"); 105 printf("\trcv_(nxt,wnd,up) (%u,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 106 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 107 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 108 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 109 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 110 111} 112 113tcp:kernel::debug-drop 114/args[0]->tcps_debug/ 115{ 116 printf("%p %s: output [x..x] @%x, urp=%x\n", arg0, 117 tcp_state_string[args[0]->tcps_state], 118 args[1]->tcp_ack, 119 args[1]->tcp_urgent); 120 121 seq = args[1]->tcp_seq; 122 ack = args[1]->tcp_ack; 123 len = args[2]->ip_plength; 124 125 printf("%p %s: drop [%x..%x]", arg0, 126 tcp_state_string[args[0]->tcps_state], seq, seq + len); 127 128 printf("@%x, urp=%x", ack, args[1]->tcp_urgent); 129 130 printf("%s", flags != 0 ? "<" : ""); 131 printf("%s", flags & TH_SYN ? "SYN," :""); 132 printf("%s", flags & TH_ACK ? "ACK," :""); 133 printf("%s", flags & TH_FIN ? "FIN," :""); 134 printf("%s", flags & TH_RST ? "RST," :""); 135 printf("%s", flags & TH_PUSH ? "PUSH," :""); 136 printf("%s", flags & TH_URG ? "URG," :""); 137 printf("%s", flags & TH_ECE ? "ECE," :""); 138 printf("%s", flags & TH_CWR ? "CWR" :""); 139 printf("%s", flags != 0 ? ">" : ""); 140 141 printf("\n"); 142 printf("\trcv_(nxt,wnd,up) (%x,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 143 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 144 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 145 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 146 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 147 148} 149 150tcp:kernel::debug-user 151/args[0]->tcps_debug/ 152{ 153 printf("%p %s: user ", arg0, 154 tcp_state_string[args[0]->tcps_state]); 155 156 printf("%s", prureq_string[arg1]); 157 printf("\n"); 158 printf("\trcv_(nxt,wnd,up) (%x,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 159 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 160 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 161 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 162 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 163 164} 165 166