The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_debug.c

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    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: releng/5.2/sys/netinet/tcp_debug.c 101921 2002-08-15 14:34:45Z rwatson $
   35  */
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 #include "opt_tcpdebug.h"
   40 
   41 #ifndef INET
   42 #error The option TCPDEBUG requires option INET.
   43 #endif
   44 
   45 #ifdef TCPDEBUG
   46 /* load symbolic names */
   47 #define PRUREQUESTS
   48 #define TCPSTATES
   49 #define TCPTIMERS
   50 #define TANAMES
   51 #endif
   52 
   53 #include <sys/param.h>
   54 #include <sys/systm.h>
   55 #include <sys/protosw.h>
   56 #include <sys/socket.h>
   57 
   58 #include <netinet/in.h>
   59 #include <netinet/in_systm.h>
   60 #include <netinet/ip.h>
   61 #ifdef INET6
   62 #include <netinet/ip6.h>
   63 #endif
   64 #include <netinet/ip_var.h>
   65 #include <netinet/tcp.h>
   66 #include <netinet/tcp_fsm.h>
   67 #include <netinet/tcp_timer.h>
   68 #include <netinet/tcp_var.h>
   69 #include <netinet/tcpip.h>
   70 #include <netinet/tcp_debug.h>
   71 
   72 #ifdef TCPDEBUG
   73 static int      tcpconsdebug = 0;
   74 #endif
   75 
   76 static struct tcp_debug tcp_debug[TCP_NDEBUG];
   77 static int      tcp_debx;
   78 
   79 /*
   80  * Tcp debug routines
   81  */
   82 void
   83 tcp_trace(act, ostate, tp, ipgen, th, req)
   84         short act, ostate;
   85         struct tcpcb *tp;
   86         void *ipgen;
   87         struct tcphdr *th;
   88         int req;
   89 {
   90 #ifdef INET6
   91         int isipv6;
   92 #endif /* INET6 */
   93         tcp_seq seq, ack;
   94         int len, flags;
   95         struct tcp_debug *td = &tcp_debug[tcp_debx++];
   96 
   97 #ifdef INET6
   98         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
   99 #endif /* INET6 */
  100         td->td_family =
  101 #ifdef INET6
  102                 (isipv6 != 0) ? AF_INET6 :
  103 #endif
  104                 AF_INET;
  105         if (tcp_debx == TCP_NDEBUG)
  106                 tcp_debx = 0;
  107         td->td_time = iptime();
  108         td->td_act = act;
  109         td->td_ostate = ostate;
  110         td->td_tcb = (caddr_t)tp;
  111         if (tp)
  112                 td->td_cb = *tp;
  113         else
  114                 bzero((caddr_t)&td->td_cb, sizeof (*tp));
  115         if (ipgen) {
  116                 switch (td->td_family) {
  117                 case AF_INET:
  118                         bcopy((caddr_t)ipgen, (caddr_t)&td->td_ti.ti_i,
  119                               sizeof(td->td_ti.ti_i));
  120                         bzero((caddr_t)td->td_ip6buf, sizeof(td->td_ip6buf));
  121                         break;
  122 #ifdef INET6
  123                 case AF_INET6:
  124                         bcopy((caddr_t)ipgen, (caddr_t)td->td_ip6buf,
  125                               sizeof(td->td_ip6buf));
  126                         bzero((caddr_t)&td->td_ti.ti_i,
  127                               sizeof(td->td_ti.ti_i));
  128                         break;
  129 #endif
  130                 default:
  131                         bzero((caddr_t)td->td_ip6buf, sizeof(td->td_ip6buf));
  132                         bzero((caddr_t)&td->td_ti.ti_i,
  133                               sizeof(td->td_ti.ti_i));
  134                         break;
  135                 }
  136         } else {
  137                 bzero((caddr_t)&td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
  138                 bzero((caddr_t)td->td_ip6buf, sizeof(td->td_ip6buf));
  139         }
  140         if (th) {
  141                 switch (td->td_family) {
  142                 case AF_INET:
  143                         td->td_ti.ti_t = *th;
  144                         bzero((caddr_t)&td->td_ti6.th, sizeof(td->td_ti6.th));
  145                         break;
  146 #ifdef INET6
  147                 case AF_INET6:
  148                         td->td_ti6.th = *th;
  149                         bzero((caddr_t)&td->td_ti.ti_t,
  150                               sizeof(td->td_ti.ti_t));
  151                         break;
  152 #endif
  153                 default:
  154                         bzero((caddr_t)&td->td_ti.ti_t,
  155                               sizeof(td->td_ti.ti_t));
  156                         bzero((caddr_t)&td->td_ti6.th, sizeof(td->td_ti6.th));
  157                         break;
  158                 }
  159         } else {
  160                 bzero((caddr_t)&td->td_ti.ti_t, sizeof(td->td_ti.ti_t));
  161                 bzero((caddr_t)&td->td_ti6.th, sizeof(td->td_ti6.th));
  162         }
  163         td->td_req = req;
  164 #ifdef TCPDEBUG
  165         if (tcpconsdebug == 0)
  166                 return;
  167         if (tp)
  168                 printf("%p %s:", tp, tcpstates[ostate]);
  169         else
  170                 printf("???????? ");
  171         printf("%s ", tanames[act]);
  172         switch (act) {
  173 
  174         case TA_INPUT:
  175         case TA_OUTPUT:
  176         case TA_DROP:
  177                 if (ipgen == NULL || th == NULL)
  178                         break;
  179                 seq = th->th_seq;
  180                 ack = th->th_ack;
  181                 len =
  182 #ifdef INET6
  183                         isipv6 ? ((struct ip6_hdr *)ipgen)->ip6_plen :
  184 #endif
  185                         ((struct ip *)ipgen)->ip_len;
  186                 if (act == TA_OUTPUT) {
  187                         seq = ntohl(seq);
  188                         ack = ntohl(ack);
  189                         len = ntohs((u_short)len);
  190                 }
  191                 if (act == TA_OUTPUT)
  192                         len -= sizeof (struct tcphdr);
  193                 if (len)
  194                         printf("[%x..%x)", seq, seq+len);
  195                 else
  196                         printf("%x", seq);
  197                 printf("@%x, urp=%x", ack, th->th_urp);
  198                 flags = th->th_flags;
  199                 if (flags) {
  200                         char *cp = "<";
  201 #define pf(f) {                                 \
  202         if (th->th_flags & TH_##f) {            \
  203                 printf("%s%s", cp, #f);         \
  204                 cp = ",";                       \
  205         }                                       \
  206 }
  207                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
  208                         printf(">");
  209                 }
  210                 break;
  211 
  212         case TA_USER:
  213                 printf("%s", prurequests[req&0xff]);
  214                 if ((req & 0xff) == PRU_SLOWTIMO)
  215                         printf("<%s>", tcptimers[req>>8]);
  216                 break;
  217         }
  218         if (tp)
  219                 printf(" -> %s", tcpstates[tp->t_state]);
  220         /* print out internal state of tp !?! */
  221         printf("\n");
  222         if (tp == 0)
  223                 return;
  224         printf(
  225         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
  226             (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
  227             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
  228         printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
  229             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
  230 #endif /* TCPDEBUG */
  231 }

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