/*      $NetBSD: tcp_debug.c,v 1.32 2018/05/03 07:13:48 maxv Exp $      */

/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 1982, 1986, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcp_debug.c,v 1.32 2018/05/03 07:13:48 maxv Exp $");

#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_tcp_debug.h"
#endif

/* load symbolic names */
#define PRUREQUESTS
#define TCPSTATES
#define TCPTIMERS
#define TANAMES

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/errno.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>

#ifdef INET6
#include <netinet/ip6.h>
#endif

#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_debug.h>

struct  tcp_debug tcp_debug[TCP_NDEBUG];
int     tcp_debx;
int     tcpconsdebug = 0;
/*
* Tcp debug routines
*/
void
tcp_trace(short act, short ostate, struct tcpcb *tp, struct mbuf *m, int req)
{
       tcp_seq seq, ack;
       int len, flags;
       struct tcphdr *th;
       struct tcp_debug *td = &tcp_debug[tcp_debx++];

       if (tcp_debx == TCP_NDEBUG)
               tcp_debx = 0;
       td->td_time = iptime();
       td->td_act = act;
       td->td_ostate = ostate;
       td->td_tcb = (void *)tp;
       if (tp)
               td->td_cb = *tp;
       else
               memset((void *)&td->td_cb, 0, sizeof (*tp));
       td->td_family = tp->t_family;
       memset((void *)&td->td_ti, 0, sizeof (td->td_ti));
#ifdef INET6
       memset((void *)&td->td_ti6, 0, sizeof (td->td_ti6));
#endif
       th = NULL;
       if (m) {
               struct ip *ip;
               ip = mtod(m, struct ip *);
               switch (ip->ip_v) {
               case 4:
                       if (m->m_len < sizeof(td->td_ti))
                               break;
                       memcpy(&td->td_ti, mtod(m, void *), sizeof(td->td_ti));
                       th = (struct tcphdr *)((char *)&td->td_ti +
                           sizeof(struct ip));
                       break;
#ifdef INET6
               case 6:
                       if (m->m_len < sizeof(td->td_ti6))
                               break;
                       memcpy(&td->td_ti6, mtod(m, void *),
                               sizeof(td->td_ti6));
                       th = (struct tcphdr *)((char *)&td->td_ti6 +
                           sizeof(struct ip6_hdr));
                       break;
#endif
               }
       }
       td->td_req = req;
       if (tcpconsdebug == 0)
               return;
       if (tp)
               printf("%p %s:", tp, tcpstates[ostate]);
       else
               printf("???????? ");
       printf("%s ", tanames[act]);
       switch (act) {

       case TA_INPUT:
       case TA_OUTPUT:
       case TA_DROP:
               if (th == 0)
                       break;
               seq = th->th_seq;
               ack = th->th_ack;
               len = m->m_pkthdr.len;
               if (act == TA_OUTPUT) {
                       seq = ntohl(seq);
                       ack = ntohl(ack);
                       len = ntohs((u_int16_t)len);
               }
               if (act == TA_OUTPUT)
                       len -= sizeof (struct tcphdr);
               if (len)
                       printf("[%x..%x)", seq, seq+len);
               else
                       printf("%x", seq);
               printf("@%x, urp=%x", ack, th->th_urp);
               flags = th->th_flags;
               if (flags) {
#ifndef lint
                       const char *cp = "<";
#define pf(f) { if (th->th_flags&__CONCAT(TH_,f)) { \
       printf("%s%s", cp, "f"); cp = ","; } }
                       pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
#endif
                       printf(">");
               }
               break;

       case TA_USER:
               printf("%s", prurequests[req&0xff]);
               if ((req & 0xff) == PRU_SLOWTIMO)
                       printf("<%s>", tcptimers[req>>8]);
               break;
       }
       if (tp)
               printf(" -> %s", tcpstates[tp->t_state]);
       /* print out internal state of tp !?! */
       printf("\n");
       if (tp == 0)
               return;
       printf("\trcv_(nxt,wnd,up) (%x,%lx,%x) snd_(una,nxt,max) (%x,%x,%x)\n",
           tp->rcv_nxt, tp->rcv_wnd, tp->rcv_up, tp->snd_una, tp->snd_nxt,
           tp->snd_max);
       printf("\tsnd_(wl1,wl2,wnd) (%x,%x,%lx)\n",
           tp->snd_wl1, tp->snd_wl2, tp->snd_wnd);
}

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