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 * The tcpdebug D script uses the tcp:kernel::debug tracepoints 28 * to replicate the action of turning on TCPDEBUG in a kernel configuration. 29 * 30 * A TCP debug statement shows a connection's 31 * 32 * direction: input, output, user, drop 33 * state: CLOSED, LISTEN, SYN_SENT, SYN_RCVD, ESTABLISHED, 34 * CLOSE_WAIT, FIN_WAIT_1, CLOSING, LAST_ACK, FIN_WAIT_2,TIME_WAIT 35 * sequence: sequence space 36 * 37 * congestion: rcv_nxt, rcv_wnd, rcv_up, snd_una, snd_nxt, snx_max, 38 * snd_wl1, snd_wl2, snd_wnd 39 * 40 * NOTE: Only sockets with SO_DEBUG set will be shown. 41 * 42 * Usage: tcpdebug 43 */ 44 45#pragma D option quiet 46tcp:kernel::debug-input 47/args[0]->tcps_debug/ 48{ 49 seq = args[1]->tcp_seq; 50 ack = args[1]->tcp_ack; 51 len = args[2]->ip_plength - sizeof(struct tcphdr); 52 flags = args[1]->tcp_flags; 53 54 printf("%p %s: input [%xu..%xu]", arg0, 55 tcp_state_string[args[0]->tcps_state], seq, seq + len); 56 57 printf("@%x, urp=%x", ack, args[1]->tcp_urgent); 58 59 printf("%s", flags != 0 ? "<" : ""); 60 printf("%s", flags & TH_SYN ? "SYN," :""); 61 printf("%s", flags & TH_ACK ? "ACK," :""); 62 printf("%s", flags & TH_FIN ? "FIN," :""); 63 printf("%s", flags & TH_RST ? "RST," :""); 64 printf("%s", flags & TH_PUSH ? "PUSH," :""); 65 printf("%s", flags & TH_URG ? "URG," :""); 66 printf("%s", flags & TH_ECE ? "ECE," :""); 67 printf("%s", flags & TH_CWR ? "CWR" :""); 68 printf("%s", flags != 0 ? ">" : ""); 69 70 printf("\n"); 71 printf("\trcv_(nxt,wnd,up) (%x,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 72 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 73 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 74 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 75 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 76 77} 78 79tcp:kernel::debug-output 80/args[0]->tcps_debug/ 81{ 82 seq = args[1]->tcp_seq; 83 ack = args[1]->tcp_ack; 84 len = args[2]->ip_plength - sizeof(struct tcphdr); 85 flags = args[1]->tcp_flags; 86 87 printf("%p %s: output [%x..%x]", arg0, 88 tcp_state_string[args[0]->tcps_state], seq, seq + len); 89 90 printf("@%x, urp=%x", ack, args[1]->tcp_urgent); 91 92 printf("%s", flags != 0 ? "<" : ""); 93 printf("%s", flags & TH_SYN ? "SYN," :""); 94 printf("%s", flags & TH_ACK ? "ACK," :""); 95 printf("%s", flags & TH_FIN ? "FIN," :""); 96 printf("%s", flags & TH_RST ? "RST," :""); 97 printf("%s", flags & TH_PUSH ? "PUSH," :""); 98 printf("%s", flags & TH_URG ? "URG," :""); 99 printf("%s", flags & TH_ECE ? "ECE," :""); 100 printf("%s", flags & TH_CWR ? "CWR" :""); 101 printf("%s", flags != 0 ? ">" : ""); 102 103 printf("\n"); 104 printf("\trcv_(nxt,wnd,up) (%u,%x,%x) snd_(una,nxt,max) (%x,%x,%x)\n", 105 args[0]->tcps_rnxt, args[0]->tcps_rwnd, args[0]->tcps_rup, 106 args[0]->tcps_suna, args[0]->tcps_snxt, args[0]->tcps_smax); 107 printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%x)\n", 108 args[0]->tcps_swl1, args[0]->tcps_swl2, args[0]->tcps_swnd); 109 110} 111 112tcp:kernel::debug-drop 113/args[0]->tcps_debug/ 114{ 115 printf("%p %s: output [x..x] @%x, urp=%x\n", arg0, 116 tcp_state_string[args[0]->tcps_state], 117 args[1]->tcp_ack, 118 args[1]->tcp_urgent); 119 120 seq = args[1]->tcp_seq; 121 ack = args[1]->tcp_ack; 122 len = args[2]->ip_plength - sizeof(struct tcphdr); 123 flags = args[1]->tcp_flags; 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