sys/netinet/tcp_debug.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
  30  * $FreeBSD: src/sys/netinet/tcp_debug.c,v 1.16.2.1 2000/07/15 07:14:31 kris Exp $
  31  */
  32
  33 #include "opt_inet.h"
  34 #include "opt_inet6.h"
  35
  36 #ifndef INET
  37 #error The option TCPDEBUG requires option INET.
  38 #endif
  39
  40 /* load symbolic names */
  41 #define PRUREQUESTS
  42 #define TCPSTATES
  43 #define TCPTIMERS
  44 #define TANAMES
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/protosw.h>
  49 #include <sys/socket.h>
  50
  51 #include <net/netisr.h>
  52 #include <net/netmsg.h>
  53
  54 #include <netinet/in.h>
  55 #include <netinet/in_systm.h>
  56 #include <netinet/ip.h>
  57 #ifdef INET6
  58 #include <netinet/ip6.h>
  59 #endif
  60 #include <netinet/ip_var.h>
  61 #include <netinet/tcp.h>
  62 #include <netinet/tcp_fsm.h>
  63 #include <netinet/tcp_timer.h>
  64 #include <netinet/tcp_var.h>
  65 #include <netinet/tcpip.h>
  66 #include <netinet/tcp_debug.h>
  67
  68 static int      tcpconsdebug = 0;
  69 static struct tcp_debug tcp_debug[TCP_NDEBUG];
  70 static int      tcp_debx;
  71
  72 /*
  73  * Tcp debug routines
  74  */
  75 void
  76 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
  77           struct tcphdr *th, int req)
  78 {
  79 #ifdef INET6
  80         int isipv6;
  81 #endif /* INET6 */
  82         tcp_seq seq, ack;
  83         int len, flags;
  84         struct tcp_debug *td = &tcp_debug[tcp_debx++];
  85
  86 #ifdef INET6
  87         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
  88 #endif /* INET6 */
  89         td->td_family =
  90 #ifdef INET6
  91                 (isipv6 != 0) ? AF_INET6 :
  92 #endif
  93                 AF_INET;
  94         if (tcp_debx == TCP_NDEBUG)
  95                 tcp_debx = 0;
  96         td->td_time = iptime();
  97         td->td_act = act;
  98         td->td_ostate = ostate;
  99         td->td_tcb = (caddr_t)tp;
 100         if (tp)
 101                 td->td_cb = *tp;
 102         else
 103                 bzero(&td->td_cb, sizeof *tp);
 104         if (ipgen) {
 105                 switch (td->td_family) {
 106                 case AF_INET:
 107                         bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
 108                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 109                         break;
 110 #ifdef INET6
 111                 case AF_INET6:
 112                         bcopy(ipgen, td->td_ip6buf, sizeof td->td_ip6buf);
 113                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 114                         break;
 115 #endif
 116                 default:
 117                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 118                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 119                         break;
 120                 }
 121         } else {
 122                 bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 123                 bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 124         }
 125         if (th) {
 126                 switch (td->td_family) {
 127                 case AF_INET:
 128                         td->td_ti.ti_t = *th;
 129                         bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 130                         break;
 131 #ifdef INET6
 132                 case AF_INET6:
 133                         td->td_ti6.th = *th;
 134                         bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 135                         break;
 136 #endif
 137                 default:
 138                         bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 139                         bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 140                         break;
 141                 }
 142         } else {
 143                 bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 144                 bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 145         }
 146         td->td_req = req;
 147         if (tcpconsdebug == 0)
 148                 return;
 149         if (tp)
 150                 kprintf("%p %s:", tp, tcpstates[ostate]);
 151         else
 152                 kprintf("???????? ");
 153         kprintf("%s ", tanames[act]);
 154         switch (act) {
 155
 156         case TA_INPUT:
 157         case TA_OUTPUT:
 158         case TA_DROP:
 159                 if (ipgen == NULL || th == NULL)
 160                         break;
 161                 seq = th->th_seq;
 162                 ack = th->th_ack;
 163                 len =
 164 #ifdef INET6
 165                         isipv6 ? ((struct ip6_hdr *)ipgen)->ip6_plen :
 166 #endif
 167                         ntohs(((struct ip *)ipgen)->ip_len);
 168                 if (act == TA_OUTPUT) {
 169                         seq = ntohl(seq);
 170                         ack = ntohl(ack);
 171                         len = ntohs((u_short)len);
 172                 }
 173                 if (act == TA_OUTPUT)
 174                         len -= sizeof(struct tcphdr);
 175                 if (len)
 176                         kprintf("[%x..%x)", seq, seq+len);
 177                 else
 178                         kprintf("%x", seq);
 179                 kprintf("@%x, urp=%x", ack, th->th_urp);
 180                 flags = th->th_flags;
 181                 if (flags) {
 182                         char *cp = "<";
 183 #define pf(f) {                                 \
 184         if (th->th_flags & TH_##f) {            \
 185                 kprintf("%s%s", cp, #f);                \
 186                 cp = ",";                       \
 187         }                                       \
 188 }
 189                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
 190                         kprintf(">");
 191                 }
 192                 break;
 193
 194         case TA_USER:
 195                 kprintf("%s", prurequests[req&0xff]);
 196                 if ((req & 0xff) == PRU_SLOWTIMO)
 197                         kprintf("<%s>", tcptimers[req>>8]);
 198                 break;
 199         }
 200         if (tp)
 201                 kprintf(" -> %s", tcpstates[tp->t_state]);
 202         /* print out internal state of tp !?! */
 203         kprintf("\n");
 204         if (tp == NULL)
 205                 return;
 206         kprintf(
 207         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
 208             (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
 209             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
 210         kprintf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
 211             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
 212 }