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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/netinet/tcp_debug.c,v 1.16.2.1 2000/07/15 07:14:31 kris Exp $
  35  * $DragonFly: src/sys/netinet/tcp_debug.c,v 1.6 2006/12/22 23:57:52 swildner Exp $
  36  */
  37
  38 #include "opt_inet.h"
  39 #include "opt_inet6.h"
  40 #include "opt_tcpdebug.h"
  41
  42 #ifndef INET
  43 #error The option TCPDEBUG requires option INET.
  44 #endif
  45
  46 #ifdef TCPDEBUG
  47 /* load symbolic names */
  48 #define PRUREQUESTS
  49 #define TCPSTATES
  50 #define TCPTIMERS
  51 #define TANAMES
  52 #endif
  53
  54 #include <sys/param.h>
  55 #include <sys/systm.h>
  56 #include <sys/protosw.h>
  57 #include <sys/socket.h>
  58
  59 #include <net/netmsg.h>
  60
  61 #include <netinet/in.h>
  62 #include <netinet/in_systm.h>
  63 #include <netinet/ip.h>
  64 #ifdef INET6
  65 #include <netinet/ip6.h>
  66 #endif
  67 #include <netinet/ip_var.h>
  68 #include <netinet/tcp.h>
  69 #include <netinet/tcp_fsm.h>
  70 #include <netinet/tcp_timer.h>
  71 #include <netinet/tcp_var.h>
  72 #include <netinet/tcpip.h>
  73 #include <netinet/tcp_debug.h>
  74
  75 #ifdef TCPDEBUG
  76 static int      tcpconsdebug = 0;
  77 #endif
  78
  79 static struct tcp_debug tcp_debug[TCP_NDEBUG];
  80 static int      tcp_debx;
  81
  82 /*
  83  * Tcp debug routines
  84  */
  85 void
  86 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
  87           struct tcphdr *th, int req)
  88 {
  89 #ifdef INET6
  90         int isipv6;
  91 #endif /* INET6 */
  92         tcp_seq seq, ack;
  93         int len, flags;
  94         struct tcp_debug *td = &tcp_debug[tcp_debx++];
  95
  96 #ifdef INET6
  97         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
  98 #endif /* INET6 */
  99         td->td_family =
 100 #ifdef INET6
 101                 (isipv6 != 0) ? AF_INET6 :
 102 #endif
 103                 AF_INET;
 104         if (tcp_debx == TCP_NDEBUG)
 105                 tcp_debx = 0;
 106         td->td_time = iptime();
 107         td->td_act = act;
 108         td->td_ostate = ostate;
 109         td->td_tcb = (caddr_t)tp;
 110         if (tp)
 111                 td->td_cb = *tp;
 112         else
 113                 bzero(&td->td_cb, sizeof *tp);
 114         if (ipgen) {
 115                 switch (td->td_family) {
 116                 case AF_INET:
 117                         bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
 118                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 119                         break;
 120 #ifdef INET6
 121                 case AF_INET6:
 122                         bcopy(ipgen, td->td_ip6buf, sizeof td->td_ip6buf);
 123                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 124                         break;
 125 #endif
 126                 default:
 127                         bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 128                         bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 129                         break;
 130                 }
 131         } else {
 132                 bzero(&td->td_ti.ti_i, sizeof td->td_ti.ti_i);
 133                 bzero(td->td_ip6buf, sizeof td->td_ip6buf);
 134         }
 135         if (th) {
 136                 switch (td->td_family) {
 137                 case AF_INET:
 138                         td->td_ti.ti_t = *th;
 139                         bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 140                         break;
 141 #ifdef INET6
 142                 case AF_INET6:
 143                         td->td_ti6.th = *th;
 144                         bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 145                         break;
 146 #endif
 147                 default:
 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                         break;
 151                 }
 152         } else {
 153                 bzero(&td->td_ti.ti_t, sizeof td->td_ti.ti_t);
 154                 bzero(&td->td_ti6.th, sizeof td->td_ti6.th);
 155         }
 156         td->td_req = req;
 157 #ifdef TCPDEBUG
 158         if (tcpconsdebug == 0)
 159                 return;
 160         if (tp)
 161                 kprintf("%p %s:", tp, tcpstates[ostate]);
 162         else
 163                 kprintf("???????? ");
 164         kprintf("%s ", tanames[act]);
 165         switch (act) {
 166
 167         case TA_INPUT:
 168         case TA_OUTPUT:
 169         case TA_DROP:
 170                 if (ipgen == NULL || th == NULL)
 171                         break;
 172                 seq = th->th_seq;
 173                 ack = th->th_ack;
 174                 len =
 175 #ifdef INET6
 176                         isipv6 ? ((struct ip6_hdr *)ipgen)->ip6_plen :
 177 #endif
 178                         ((struct ip *)ipgen)->ip_len;
 179                 if (act == TA_OUTPUT) {
 180                         seq = ntohl(seq);
 181                         ack = ntohl(ack);
 182                         len = ntohs((u_short)len);
 183                 }
 184                 if (act == TA_OUTPUT)
 185                         len -= sizeof(struct tcphdr);
 186                 if (len)
 187                         kprintf("[%x..%x)", seq, seq+len);
 188                 else
 189                         kprintf("%x", seq);
 190                 kprintf("@%x, urp=%x", ack, th->th_urp);
 191                 flags = th->th_flags;
 192                 if (flags) {
 193                         char *cp = "<";
 194 #define pf(f) {                                 \
 195         if (th->th_flags & TH_##f) {            \
 196                 kprintf("%s%s", cp, #f);                \
 197                 cp = ",";                       \
 198         }                                       \
 199 }
 200                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
 201                         kprintf(">");
 202                 }
 203                 break;
 204
 205         case TA_USER:
 206                 kprintf("%s", prurequests[req&0xff]);
 207                 if ((req & 0xff) == PRU_SLOWTIMO)
 208                         kprintf("<%s>", tcptimers[req>>8]);
 209                 break;
 210         }
 211         if (tp)
 212                 kprintf(" -> %s", tcpstates[tp->t_state]);
 213         /* print out internal state of tp !?! */
 214         kprintf("\n");
 215         if (tp == 0)
 216                 return;
 217         kprintf(
 218         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
 219             (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
 220             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
 221         kprintf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
 222             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
 223 #endif /* TCPDEBUG */
 224 }