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 #include "opt_tcpdebug.h"
  36
  37 #ifndef INET
  38 #error The option TCPDEBUG requires option INET.
  39 #endif
  40
  41 #ifdef TCPDEBUG
  42 /* load symbolic names */
  43 #define PRUREQUESTS
  44 #define TCPSTATES
  45 #define TCPTIMERS
  46 #define TANAMES
  47 #endif
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/protosw.h>
  52 #include <sys/socket.h>
  53
  54 #include <net/netmsg.h>
  55
  56 #include <netinet/in.h>
  57 #include <netinet/in_systm.h>
  58 #include <netinet/ip.h>
  59 #ifdef INET6
  60 #include <netinet/ip6.h>
  61 #endif
  62 #include <netinet/ip_var.h>
  63 #include <netinet/tcp.h>
  64 #include <netinet/tcp_fsm.h>
  65 #include <netinet/tcp_timer.h>
  66 #include <netinet/tcp_var.h>
  67 #include <netinet/tcpip.h>
  68 #include <netinet/tcp_debug.h>
  69
  70 #ifdef TCPDEBUG
  71 static int      tcpconsdebug = 0;
  72 #endif
  73
  74 static struct tcp_debug tcp_debug[TCP_NDEBUG];
  75 static int      tcp_debx;
  76
  77 /*
  78  * Tcp debug routines
  79  */
  80 void
  81 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
  82           struct tcphdr *th, int req)
  83 {
  84 #ifdef INET6
  85         int isipv6;
  86 #endif /* INET6 */
  87         tcp_seq seq, ack;
  88         int len, flags;
  89         struct tcp_debug *td = &tcp_debug[tcp_debx++];
  90
  91 #ifdef INET6
  92         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
  93 #endif /* INET6 */
  94         td->td_family =
  95 #ifdef INET6
  96                 (isipv6 != 0) ? AF_INET6 :
  97 #endif
  98                 AF_INET;
  99         if (tcp_debx == TCP_NDEBUG)
 100                 tcp_debx = 0;
 101         td->td_time = iptime();
 102         td->td_act = act;
 103         td->td_ostate = ostate;
 104         td->td_tcb = (caddr_t)tp;
 105         if (tp)
 106                 td->td_cb = *tp;
 107         else
 108                 bzero(&td->td_cb, sizeof *tp);
 109         if (ipgen) {
 110                 switch (td->td_family) {
 111                 case AF_INET:
 112                         bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
 113                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 114                         break;
 115 #ifdef INET6
 116                 case AF_INET6:
 117                         bcopy(ipgen, td->td_ip6buf, sizeof td->td_ip6buf);
 118                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 119                         break;
 120 #endif
 121                 default:
 122                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 123                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 124                         break;
 125                 }
 126         } else {
 127                 bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 128                 bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 129         }
 130         if (th) {
 131                 switch (td->td_family) {
 132                 case AF_INET:
 133                         td->td_ti.ti_t = *th;
 134                         bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 135                         break;
 136 #ifdef INET6
 137                 case AF_INET6:
 138                         td->td_ti6.th = *th;
 139                         bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 140                         break;
 141 #endif
 142                 default:
 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                         break;
 146                 }
 147         } else {
 148                 bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 149                 bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 150         }
 151         td->td_req = req;
 152 #ifdef TCPDEBUG
 153         if (tcpconsdebug == 0)
 154                 return;
 155         if (tp)
 156                 kprintf("%p %s:", tp, tcpstates[ostate]);
 157         else
 158                 kprintf("???????? ");
 159         kprintf("%s ", tanames[act]);
 160         switch (act) {
 161
 162         case TA_INPUT:
 163         case TA_OUTPUT:
 164         case TA_DROP:
 165                 if (ipgen == NULL || th == NULL)
 166                         break;
 167                 seq = th->th_seq;
 168                 ack = th->th_ack;
 169                 len =
 170 #ifdef INET6
 171                         isipv6 ? ((struct ip6_hdr *)ipgen)->ip6_plen :
 172 #endif
 173                         ((struct ip *)ipgen)->ip_len;
 174                 if (act == TA_OUTPUT) {
 175                         seq = ntohl(seq);
 176                         ack = ntohl(ack);
 177                         len = ntohs((u_short)len);
 178                 }
 179                 if (act == TA_OUTPUT)
 180                         len -= sizeof(struct tcphdr);
 181                 if (len)
 182                         kprintf("[%x..%x)", seq, seq+len);
 183                 else
 184                         kprintf("%x", seq);
 185                 kprintf("@%x, urp=%x", ack, th->th_urp);
 186                 flags = th->th_flags;
 187                 if (flags) {
 188                         char *cp = "<";
 189 #define pf(f) {                                 \
 190         if (th->th_flags & TH_##f) {            \
 191                 kprintf("%s%s", cp, #f);                \
 192                 cp = ",";                       \
 193         }                                       \
 194 }
 195                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
 196                         kprintf(">");
 197                 }
 198                 break;
 199
 200         case TA_USER:
 201                 kprintf("%s", prurequests[req&0xff]);
 202                 if ((req & 0xff) == PRU_SLOWTIMO)
 203                         kprintf("<%s>", tcptimers[req>>8]);
 204                 break;
 205         }
 206         if (tp)
 207                 kprintf(" -> %s", tcpstates[tp->t_state]);
 208         /* print out internal state of tp !?! */
 209         kprintf("\n");
 210         if (tp == NULL)
 211                 return;
 212         kprintf(
 213         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
 214             (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
 215             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
 216         kprintf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
 217             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
 218 #endif /* TCPDEBUG */
 219 }