/* * 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, and (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. * 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. * * Original code by Hannes Gredler (hannes@juniper.net) */#ifndef lintstatic const char rcsid[] _U_ =    "@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.10 2006-02-02 06:35:52 hannes Exp $";#endif#ifdef HAVE_CONFIG_H#include "config.h"#endif#include <tcpdump-stdinc.h>#include <stdio.h>#include <stdlib.h>#include "interface.h"#include "extract.h"#include "addrtoname.h"#include "udp.h"/* * Control packet, BFDv0, draft-katz-ward-bfd-01.txt * *     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 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |Vers |  Diag   |H|D|P|F| Rsvd  |  Detect Mult  |    Length     | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                       My Discriminator                        | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                      Your Discriminator                       | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                    Desired Min TX Interval                    | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                   Required Min RX Interval                    | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                 Required Min Echo RX Interval                 | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *//*  *  Control packet, BFDv1, draft-ietf-bfd-base-02.txt * *     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 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |Vers |  Diag   |Sta|P|F|C|A|D|R|  Detect Mult  |    Length     | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                       My Discriminator                        | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                      Your Discriminator                       | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                    Desired Min TX Interval                    | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                   Required Min RX Interval                    | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |                 Required Min Echo RX Interval                 | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */struct bfd_header_t {    u_int8_t version_diag;    u_int8_t flags;    u_int8_t detect_time_multiplier;    u_int8_t length;    u_int8_t my_discriminator[4];    u_int8_t your_discriminator[4];    u_int8_t desired_min_tx_interval[4];    u_int8_t required_min_rx_interval[4];    u_int8_t required_min_echo_interval[4];};/* *    An optional Authentication Header may be present * *     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 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ *    |   Auth Type   |   Auth Len    |    Authentication Data...     | *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */struct bfd_auth_header_t {    u_int8_t auth_type;    u_int8_t auth_len;    u_int8_t auth_data;};static const struct tok bfd_v1_authentication_values[] = {    { 0,        "Reserved" },    { 1,        "Simple Password" },    { 2,        "Keyed MD5" },    { 3,        "Meticulous Keyed MD5" },    { 4,        "Keyed SHA1" },    { 5,        "Meticulous Keyed SHA1" },    { 0, NULL }};#define	BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)#define	BFD_EXTRACT_DIAG(x)     ((x)&0x1f)static const struct tok bfd_port_values[] = {    { BFD_CONTROL_PORT, "Control" },    { BFD_ECHO_PORT,    "Echo" },    { 0, NULL }};static const struct tok bfd_diag_values[] = {    { 0, "No Diagnostic" },    { 1, "Control Detection Time Expired" },    { 2, "Echo Function Failed" },    { 3, "Neighbor Signaled Session Down" },    { 4, "Forwarding Plane Reset" },    { 5, "Path Down" },    { 6, "Concatenated Path Down" },    { 7, "Administratively Down" },    { 8, "Reverse Concatenated Path Down" },    { 0, NULL }};static const struct tok bfd_v0_flag_values[] = {    { 0x80,	"I Hear You" },    { 0x40,	"Demand" },    { 0x20,	"Poll" },    { 0x10,	"Final" },    { 0x08,	"Reserved" },    { 0x04,	"Reserved" },    { 0x02,	"Reserved" },    { 0x01,	"Reserved" },    { 0, NULL }};#define BFD_FLAG_AUTH 0x04static const struct tok bfd_v1_flag_values[] = {    { 0x20, "Poll" },    { 0x10, "Final" },    { 0x08, "Control Plane Independent" },    { BFD_FLAG_AUTH, "Authentication Present" },    { 0x02, "Demand" },    { 0x01, "Reserved" },    { 0, NULL }};static const struct tok bfd_v1_state_values[] = {    { 0, "AdminDown" },    { 1, "Down" },    { 2, "Init" },    { 3, "Up" },    { 0, NULL }};voidbfd_print(register const u_char *pptr, register u_int len, register u_int port){        const struct bfd_header_t *bfd_header;        const struct bfd_auth_header_t *bfd_auth_header;        u_int8_t version;        bfd_header = (const struct bfd_header_t *)pptr;        TCHECK(*bfd_header);        version = BFD_EXTRACT_VERSION(bfd_header->version_diag);        switch (port << 8 | version) {            /* BFDv0 */        case (BFD_CONTROL_PORT << 8):            if (vflag < 1 )            {                printf("BFDv%u, %s, Flags: [%s], length: %u",                       version,                       tok2str(bfd_port_values, "unknown (%u)", port),                       bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),                       len);                return;            }                        printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",                   version,                   len,                   tok2str(bfd_port_values, "unknown (%u)", port),                   bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),                   tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),                   BFD_EXTRACT_DIAG(bfd_header->version_diag));                        printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",                   bfd_header->detect_time_multiplier,                   bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,                   bfd_header->length);            printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));            printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));            printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);            printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);            printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);            break;            /* BFDv1 */        case (BFD_CONTROL_PORT << 8 | 1):            if (vflag < 1 )            {                printf("BFDv%u, %s, State %s, Flags: [%s], length: %u",                       version,                       tok2str(bfd_port_values, "unknown (%u)", port),                       tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),                       bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),                       len);                return;            }                        printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",                   version,                   len,                   tok2str(bfd_port_values, "unknown (%u)", port),                   tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),                   bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),                   tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),                   BFD_EXTRACT_DIAG(bfd_header->version_diag));                        printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",                   bfd_header->detect_time_multiplier,                   bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,                   bfd_header->length);            printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));            printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));            printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);            printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);            printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);            if (bfd_header->flags & BFD_FLAG_AUTH) {                pptr += sizeof (const struct bfd_header_t);                bfd_auth_header = (const struct bfd_auth_header_t *)pptr;                TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t));                printf("\n\t%s (%u) Authentication, length %u present",                       tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type),                       bfd_auth_header->auth_type,                       bfd_auth_header->auth_len);            }            break;            /* BFDv0 */        case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */            /* BFDv1 */        case (BFD_ECHO_PORT << 8 | 1):        default:            printf("BFD, %s, length: %u",                   tok2str(bfd_port_values, "unknown (%u)", port),                   len);            if (vflag >= 1) {                if(!print_unknown_data(pptr,"\n\t",len))                    return;            }            break;        }        return;trunc:        printf("[|BFD]");}