print-pim.c

Windump3.6.2源代码

/*
 * Copyright (c) 1995, 1996
 *	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: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-pim.c,v 1.23 2000/10/03 02:55:00 itojun Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifndef WIN32
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#else 
#include <winsock2.h>
#include "bittypes.h"
#endif /* WIN32 */

/*
 * XXX: We consider a case where IPv6 is not ready yet for portability,
 * but PIM dependent defintions should be independent of IPv6...
 */

struct pim {
	u_int8_t pim_typever;
			/* upper 4bit: PIM version number; 2 for PIMv2 */
			/* lower 4bit: the PIM message type, currently they are:
			 * Hello, Register, Register-Stop, Join/Prune,
			 * Bootstrap, Assert, Graft (PIM-DM only),
			 * Graft-Ack (PIM-DM only), C-RP-Adv
			 */
#define PIM_VER(x)	(((x) & 0xf0) >> 4)
#define PIM_TYPE(x)	((x) & 0x0f)
	u_char  pim_rsv;	/* Reserved */
	u_short	pim_cksum;	/* IP style check sum */
};


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#include "ip.h"

static void pimv2_print(register const u_char *bp, register u_int len);

static void
pimv1_join_prune_print(register const u_char *bp, register u_int len)
{
    int maddrlen, addrlen, ngroups, njoin, nprune;
    int njp;

    /* If it's a single group and a single source, use 1-line output. */
    if (TTEST2(bp[0], 30) && bp[11] == 1 &&
	((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
	    int hold;

	    (void)printf(" RPF %s ", ipaddr_string(bp));
	    hold = EXTRACT_16BITS(&bp[6]);
	    if (hold != 180) {
		(void)printf("Hold ");
		relts_print(hold);
	    }
	    (void)printf("%s (%s/%d, %s", njoin ? "Join" : "Prune",
		    ipaddr_string(&bp[26]), bp[25] & 0x3f,
		    ipaddr_string(&bp[12]));
	    if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
		    (void)printf("/%s", ipaddr_string(&bp[16]));
	    (void)printf(") %s%s %s",
		    (bp[24] & 0x01) ? "Sparse" : "Dense",
		    (bp[25] & 0x80) ? " WC" : "",
		    (bp[25] & 0x40) ? "RP" : "SPT");
	    return;
    }
	
    TCHECK2(bp[0], 4);
    (void)printf("\n Upstream Nbr: %s", ipaddr_string(bp));
    TCHECK2(bp[6], 2);
    (void)printf("\n Hold time: ");
    relts_print(EXTRACT_16BITS(&bp[6]));
    bp += 8; len -= 8;

    TCHECK2(bp[0], 4);
    maddrlen = bp[1];
    addrlen = bp[2];
    ngroups = bp[3];
    bp += 4; len -= 4;
    while (ngroups--) {
	TCHECK2(bp[0], 4);
	(void)printf("\n\tGroup: %s", ipaddr_string(bp));
	if (EXTRACT_32BITS(&bp[4]) != 0xffffffff)
		(void)printf("/%s", ipaddr_string(&bp[4]));
	TCHECK2(bp[8], 4);
	njoin = EXTRACT_16BITS(&bp[8]);
	nprune = EXTRACT_16BITS(&bp[10]);
	(void)printf(" joined: %d pruned: %d", njoin, nprune);
	bp += 12; len -= 12;
	for (njp = 0; njp < (njoin + nprune); njp++) {
	    char *type;

	    if (njp < njoin) {
		type = "Join ";
	    } else {
		type = "Prune";
	    }
	    TCHECK2(bp[0], 6);
	    (void)printf("\n\t%s %s%s%s%s/%d", type,
			    (bp[0] & 0x01) ? "Sparse " : "Dense ",
			    (bp[1] & 0x80) ? "WC " : "",
			    (bp[1] & 0x40) ? "RP " : "SPT ",
			    ipaddr_string(&bp[2]), bp[1] & 0x3f);
	    bp += 6; len -= 6;
	}
    }
    return;
trunc:
    (void)printf("[|pim]");
    return;
}

void
pimv1_print(register const u_char *bp, register u_int len)
{
    register const u_char *ep;
    register u_char type;

    ep = (const u_char *)snapend;
    if (bp >= ep)
	return;

    type = bp[1];

    switch (type) {
    case 0:
	(void)printf(" Query");
	if (TTEST(bp[8])) {
		switch (bp[8] >> 4) {
		    case 0:	(void)printf(" Dense-mode");
				break;
		    case 1:	(void)printf(" Sparse-mode");
				break;
		    case 2:	(void)printf(" Sparse-Dense-mode");
				break;
		    default:	(void)printf(" mode-%d", bp[8] >> 4);
				break;
		}
	}
	if (vflag) {
	    TCHECK2(bp[10],2);
	    (void)printf(" (Hold-time ");
	    relts_print(EXTRACT_16BITS(&bp[10]));
	    (void)printf(")");
	}
	break;

    case 1:
	(void)printf(" Register");
	TCHECK2(bp[8], 20);			/* ip header */
	(void)printf(" for %s > %s", ipaddr_string(&bp[20]),
				     ipaddr_string(&bp[24]));
	break;

    case 2:
	(void)printf(" Register-Stop");
	TCHECK2(bp[12], 4);
	(void)printf(" for %s > %s", ipaddr_string(&bp[8]),
				     ipaddr_string(&bp[12]));
	break;

    case 3:
	(void)printf(" Join/Prune");
	if (vflag) {
	    pimv1_join_prune_print(&bp[8], len - 8);
	}
	break;

    case 4:
	(void)printf(" RP-reachable");
	if (vflag) {
		TCHECK2(bp[22], 2);
		(void)printf(" group %s",
			ipaddr_string(&bp[8]));
		if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
			(void)printf("/%s", ipaddr_string(&bp[12]));
		(void)printf(" RP %s hold ",
			ipaddr_string(&bp[16]));
		relts_print(EXTRACT_16BITS(&bp[22]));
	}
	break;

    case 5:
	(void)printf(" Assert");
	TCHECK2(bp[16], 4);
	(void)printf(" for %s > %s", ipaddr_string(&bp[16]),
					    ipaddr_string(&bp[8]));
	if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
		(void)printf("/%s", ipaddr_string(&bp[12]));
	TCHECK2(bp[24], 4);
	(void)printf(" %s pref %d metric %d",
		(bp[20] & 0x80) ? "RP-tree" : "SPT",
		EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
		EXTRACT_32BITS(&bp[24]));
	break;

    case 6:
	(void)printf(" Graft");
	if (vflag) {
	    pimv1_join_prune_print(&bp[8], len - 8);
	}
	break;

    case 7:
	(void)printf(" Graft-ACK");
	if (vflag) {
	    pimv1_join_prune_print(&bp[8], len - 8);
	}
	break;

    case 8:
	(void)printf(" Mode");
	break;

    default:
	(void)printf(" [type %d]", type);
	break;
    }
    if ((bp[4] >> 4) != 1)
	(void)printf(" [v%d]", bp[4] >> 4);
    return;

trunc:
    (void)printf("[|pim]");
    return;
}

/*
 * auto-RP is a cisco protocol, documented at
 * ftp://ftpeng.cisco.com/ipmulticast/pim-autorp-spec01.txt
 */
void
cisco_autorp_print(register const u_char *bp, register u_int len)
{
    int type;
    int numrps;
    int hold;

    TCHECK(bp[0]);
    (void)printf(" auto-rp ");
    type = bp[0];
    switch (type) {
    case 0x11:
	(void)printf("candidate-advert");
	break;
    case 0x12:
	(void)printf("mapping");
	break;
    default:
	(void)printf("type-0x%02x", type);
	break;
    }

    TCHECK(bp[1]);
    numrps = bp[1];

    TCHECK2(bp[2], 2);
    (void)printf(" Hold ");
    hold = EXTRACT_16BITS(&bp[2]);
    if (hold)
	relts_print(EXTRACT_16BITS(&bp[2]));
    else
	printf("FOREVER");

    /* Next 4 bytes are reserved. */

    bp += 8; len -= 8;

    /*XXX skip unless -v? */

    /*
     * Rest of packet:
     * numrps entries of the form:
     * 32 bits: RP
     * 6 bits: reserved
     * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
     * 8 bits: # of entries for this RP
     * each entry: 7 bits: reserved, 1 bit: negative,
     *			8 bits: mask 32 bits: source
     * lather, rinse, repeat.
     */
    while (numrps--) {
	int nentries;
	char s;

	TCHECK2(bp[0], 4);
	(void)printf(" RP %s", ipaddr_string(bp));
	TCHECK(bp[4]);
	switch (bp[4] & 0x3) {
	case 0:	printf(" PIMv?");
		break;
	case 1:	printf(" PIMv1");
		break;
	case 2:	printf(" PIMv2");
		break;
	case 3:	printf(" PIMv1+2");
		break;
	}
	TCHECK(bp[5]);
	nentries = bp[5];
	bp += 6; len -= 6;
	s = ' ';
	for (; nentries; nentries--) {
	    TCHECK2(bp[0], 6);
	    (void)printf("%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
					ipaddr_string(&bp[2]), bp[1]);
	    s = ',';
	    bp += 6; len -= 6;
	}
    }
    return;

trunc:
    (void)printf("[|autorp]");
    return;
}

void
pim_print(register const u_char *bp, register u_int len)
{
	register const u_char *ep;
	register struct pim *pim = (struct pim *)bp;

	ep = (const u_char *)snapend;
	if (bp >= ep)
		return;
#ifdef notyet			/* currently we see only version and type */
	TCHECK(pim->pim_rsv);
#endif

	switch (PIM_VER(pim->pim_typever)) {
	 case 2:		/* avoid hardcoding? */
		(void)printf("pim v2");
		pimv2_print(bp, len);
		break;
	 default:
		(void)printf("pim v%d", PIM_VER(pim->pim_typever));
		break;
	}
	return;
}

/*
 * PIMv2 uses encoded address representations.
 *
 * The last PIM-SM I-D before RFC2117 was published specified the
 * following representation for unicast addresses.  However, RFC2117
 * specified no encoding for unicast addresses with the unicast
 * address length specified in the header.  Therefore, we have to
 * guess which encoding is being used (Cisco's PIMv2 implementation
 * uses the non-RFC encoding).  RFC2117 turns a previously "Reserved"
 * field into a 'unicast-address-length-in-bytes' field.  We guess
 * that it's the draft encoding if this reserved field is zero.
 *
 * RFC2362 goes back to the encoded format, and calls the addr length
 * field "reserved" again.
 *
 * The first byte is the address family, from:
 *
 *    0    Reserved
 *    1    IP (IP version 4)
 *    2    IP6 (IP version 6)
 *    3    NSAP
 *    4    HDLC (8-bit multidrop)
 *    5    BBN 1822
 *    6    802 (includes all 802 media plus Ethernet "canonical format")
 *    7    E.163
 *    8    E.164 (SMDS, Frame Relay, ATM)
 *    9    F.69 (Telex)
 *   10    X.121 (X.25, Frame Relay)
 *   11    IPX
 *   12    Appletalk
 *   13    Decnet IV
 *   14    Banyan Vines
 *   15    E.164 with NSAP format subaddress
 *
 * In addition, the second byte is an "Encoding".  0 is the default
 * encoding for the address family, and no other encodings are currently
 * specified.
 *
 */

static int pimv2_addr_len;

enum pimv2_addrtype {
	pimv2_unicast, pimv2_group, pimv2_source
};
#if 0
static char *addrtypestr[] = {
	"unicast", "group", "source"
};
#endif

/*  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | Addr Family   | Encoding Type |     Unicast Address           |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | Addr Family   | Encoding Type |   Reserved    |  Mask Len     |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                Group multicast Address                        |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | Addr Family   | Encoding Type | Rsrvd   |S|W|R|  Mask Len     |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                        Source Address                         |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */
static int
pimv2_addr_print(const u_char *bp, enum pimv2_addrtype at, int silent)
{
	int af;
	char *afstr;
	int len, hdrlen;

	TCHECK(bp[0]);

	if (pimv2_addr_len == 0) {
		TCHECK(bp[1]);
		switch (bp[0]) {
		 case 1:
			af = AF_INET;
			afstr = "IPv4";
			len = 4;
			break;
#ifdef INET6
		 case 2:
			af = AF_INET6;
			afstr = "IPv6";
			len = 16;
			break;
#endif
		 default:
			return -1;