/* \summary: Bidirectional Forwarding Detection (BFD) printer */
-/* specification: RFC 5880 (for version 1) and RFC 5881 */
+/*
+ * specification: draft-ietf-bfd-base-01 for version 0,
+ * RFC 5880 for version 1, and RFC 5881
+ */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <netdissect-stdinc.h>
+#include "netdissect-stdinc.h"
+#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
#include "udp.h"
/*
- * Control packet, BFDv0, draft-katz-ward-bfd-01.txt
+ * Control packet, BFDv0, draft-ietf-bfd-base-01
*
* 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 |
+ * |Vers | Diag |H|D|P|F|C|A|Rsv| Detect Mult | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | My Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#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" },
{ 0, NULL }
};
+static const struct tok bfd_port_values[] = {
+ { BFD_CONTROL_PORT, "Control" },
+ { BFD_MULTIHOP_PORT, "Multihop" },
+ { BFD_LAG_PORT, "LAG" },
+ { SBFD_PORT, "S-BFD" },
+ { 0, NULL }
+};
+
+#define BFD_FLAG_AUTH 0x04
+
static const struct tok bfd_v0_flag_values[] = {
{ 0x80, "I Hear You" },
{ 0x40, "Demand" },
{ 0x20, "Poll" },
{ 0x10, "Final" },
- { 0x08, "Reserved" },
- { 0x04, "Reserved" },
+ { 0x08, "Control Plane Independent" },
+ { BFD_FLAG_AUTH, "Authentication Present" },
{ 0x02, "Reserved" },
{ 0x01, "Reserved" },
{ 0, NULL }
};
-#define BFD_FLAG_AUTH 0x04
-
static const struct tok bfd_v1_flag_values[] = {
{ 0x20, "Poll" },
{ 0x10, "Final" },
{ 0, NULL }
};
-static int
+static void
auth_print(netdissect_options *ndo, const u_char *pptr)
{
const struct bfd_auth_header_t *bfd_auth_header;
pptr += sizeof (struct bfd_header_t);
bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
- ND_TCHECK(*bfd_auth_header);
- auth_type = EXTRACT_U_1(bfd_auth_header->auth_type);
- auth_len = EXTRACT_U_1(bfd_auth_header->auth_len);
- ND_PRINT((ndo, "\n\tAuthentication: %s (%u), length: %u",
+ ND_TCHECK_SIZE(bfd_auth_header);
+ auth_type = GET_U_1(bfd_auth_header->auth_type);
+ auth_len = GET_U_1(bfd_auth_header->auth_len);
+ ND_PRINT("\n\tAuthentication: %s (%u), length: %u",
tok2str(bfd_v1_authentication_values,"Unknown",auth_type),
- auth_type, auth_len));
+ auth_type, auth_len);
pptr += 2;
- ND_PRINT((ndo, "\n\t Auth Key ID: %u", EXTRACT_U_1(pptr)));
+ ND_PRINT("\n\t Auth Key ID: %u", GET_U_1(pptr));
switch(auth_type) {
case AUTH_PASSWORD:
*/
if (auth_len < AUTH_PASSWORD_FIELD_MIN_LEN ||
auth_len > AUTH_PASSWORD_FIELD_MAX_LEN) {
- ND_PRINT((ndo, "[invalid length %u]",
- auth_len));
+ ND_PRINT("[invalid length %u]",
+ auth_len);
break;
}
pptr++;
- ND_PRINT((ndo, ", Password: "));
+ ND_PRINT(", Password: ");
/* the length is equal to the password length plus three */
- if (fn_printn(ndo, pptr, auth_len - 3,
- ndo->ndo_snapend))
- goto trunc;
+ nd_printjn(ndo, pptr, auth_len - 3);
break;
case AUTH_MD5:
case AUTH_MET_MD5:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (auth_len != AUTH_MD5_FIELD_LEN) {
- ND_PRINT((ndo, "[invalid length %u]",
- auth_len));
+ ND_PRINT("[invalid length %u]",
+ auth_len);
break;
}
pptr += 2;
- ND_TCHECK_4(pptr);
- ND_PRINT((ndo, ", Sequence Number: 0x%08x", EXTRACT_BE_U_4(pptr)));
+ ND_PRINT(", Sequence Number: 0x%08x", GET_BE_U_4(pptr));
pptr += 4;
ND_TCHECK_LEN(pptr, AUTH_MD5_HASH_LEN);
- ND_PRINT((ndo, "\n\t Digest: "));
+ ND_PRINT("\n\t Digest: ");
for(i = 0; i < AUTH_MD5_HASH_LEN; i++)
- ND_PRINT((ndo, "%02x", EXTRACT_U_1(pptr + i)));
+ ND_PRINT("%02x", GET_U_1(pptr + i));
break;
case AUTH_SHA1:
case AUTH_MET_SHA1:
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (auth_len != AUTH_SHA1_FIELD_LEN) {
- ND_PRINT((ndo, "[invalid length %u]",
- auth_len));
+ ND_PRINT("[invalid length %u]",
+ auth_len);
break;
}
pptr += 2;
- ND_TCHECK_4(pptr);
- ND_PRINT((ndo, ", Sequence Number: 0x%08x", EXTRACT_BE_U_4(pptr)));
+ ND_PRINT(", Sequence Number: 0x%08x", GET_BE_U_4(pptr));
pptr += 4;
ND_TCHECK_LEN(pptr, AUTH_SHA1_HASH_LEN);
- ND_PRINT((ndo, "\n\t Hash: "));
+ ND_PRINT("\n\t Hash: ");
for(i = 0; i < AUTH_SHA1_HASH_LEN; i++)
- ND_PRINT((ndo, "%02x", EXTRACT_U_1(pptr + i)));
+ ND_PRINT("%02x", GET_U_1(pptr + i));
break;
}
- return 0;
-
-trunc:
- return 1;
}
void
bfd_print(netdissect_options *ndo, const u_char *pptr,
u_int len, u_int port)
{
- const struct bfd_header_t *bfd_header;
- uint8_t version_diag;
- uint8_t version = 0;
- uint8_t flags;
-
- bfd_header = (const struct bfd_header_t *)pptr;
- version_diag = EXTRACT_U_1(bfd_header->version_diag);
- if (port == BFD_CONTROL_PORT) {
- ND_TCHECK(*bfd_header);
+ ndo->ndo_protocol = "bfd";
+ if (port == BFD_CONTROL_PORT ||
+ port == BFD_MULTIHOP_PORT ||
+ port == BFD_LAG_PORT ||
+ port == SBFD_PORT) {
+ /*
+ * Control packet.
+ */
+ const struct bfd_header_t *bfd_header;
+ uint8_t version_diag;
+ uint8_t version = 0;
+ uint8_t flags;
+
+ bfd_header = (const struct bfd_header_t *)pptr;
+ ND_TCHECK_SIZE(bfd_header);
+ version_diag = GET_U_1(bfd_header->version_diag);
version = BFD_EXTRACT_VERSION(version_diag);
- } else if (port == BFD_ECHO_PORT) {
- /* Echo is BFD v1 only */
- version = 1;
- }
- flags = EXTRACT_U_1(bfd_header->flags);
- switch ((port << 8) | version) {
-
- /* BFDv0 */
- case (BFD_CONTROL_PORT << 8):
- if (ndo->ndo_vflag < 1)
- {
- ND_PRINT((ndo, "BFDv%u, %s, Flags: [%s], length: %u",
- version,
- tok2str(bfd_port_values, "unknown (%u)", port),
+ flags = GET_U_1(bfd_header->flags);
+
+ switch (version) {
+
+ /* BFDv0 */
+ case 0:
+ if (ndo->ndo_vflag < 1) {
+ ND_PRINT("BFDv0, Control, Flags: [%s], length: %u",
+ bittok2str(bfd_v0_flag_values, "none", flags),
+ len);
+ return;
+ }
+
+ ND_PRINT("BFDv0, length: %u\n\tControl, Flags: [%s], Diagnostic: %s (0x%02x)",
+ len,
bittok2str(bfd_v0_flag_values, "none", flags),
- len));
- return;
- }
+ tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
+ BFD_EXTRACT_DIAG(version_diag));
+
+ ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
+ GET_U_1(bfd_header->detect_time_multiplier),
+ GET_U_1(bfd_header->detect_time_multiplier) * GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
+ GET_U_1(bfd_header->length));
+
+
+ ND_PRINT("\n\tMy Discriminator: 0x%08x",
+ GET_BE_U_4(bfd_header->my_discriminator));
+ ND_PRINT(", Your Discriminator: 0x%08x",
+ GET_BE_U_4(bfd_header->your_discriminator));
+ ND_PRINT("\n\t Desired min Tx Interval: %4u ms",
+ GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
+ ND_PRINT("\n\t Required min Rx Interval: %4u ms",
+ GET_BE_U_4(bfd_header->required_min_rx_interval)/1000);
+ ND_PRINT("\n\t Required min Echo Interval: %4u ms",
+ GET_BE_U_4(bfd_header->required_min_echo_interval)/1000);
+
+ if (flags & BFD_FLAG_AUTH) {
+ auth_print(ndo, pptr);
+ }
+ break;
- ND_PRINT((ndo, "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", flags),
- tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
- BFD_EXTRACT_DIAG(version_diag)));
-
- ND_PRINT((ndo, "\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
- EXTRACT_U_1(bfd_header->detect_time_multiplier),
- EXTRACT_U_1(bfd_header->detect_time_multiplier) * EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
- EXTRACT_U_1(bfd_header->length)));
-
-
- ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->my_discriminator)));
- ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->your_discriminator)));
- ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000));
- ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_rx_interval)/1000));
- ND_PRINT((ndo, "\n\t Required min Echo Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_echo_interval)/1000));
- break;
-
- /* BFDv1 */
- case (BFD_CONTROL_PORT << 8 | 1):
- if (ndo->ndo_vflag < 1)
- {
- ND_PRINT((ndo, "BFDv%u, %s, State %s, Flags: [%s], length: %u",
- version,
+ /* BFDv1 */
+ case 1:
+ if (ndo->ndo_vflag < 1) {
+ ND_PRINT("BFDv1, %s, State %s, Flags: [%s], length: %u",
+ tok2str(bfd_port_values, "unknown (%u)", port),
+ tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
+ bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
+ len);
+ return;
+ }
+
+ ND_PRINT("BFDv1, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
+ len,
tok2str(bfd_port_values, "unknown (%u)", port),
tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
- len));
- return;
- }
+ tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
+ BFD_EXTRACT_DIAG(version_diag));
+
+ ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
+ GET_U_1(bfd_header->detect_time_multiplier),
+ GET_U_1(bfd_header->detect_time_multiplier) * GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
+ GET_U_1(bfd_header->length));
+
+
+ ND_PRINT("\n\tMy Discriminator: 0x%08x",
+ GET_BE_U_4(bfd_header->my_discriminator));
+ ND_PRINT(", Your Discriminator: 0x%08x",
+ GET_BE_U_4(bfd_header->your_discriminator));
+ ND_PRINT("\n\t Desired min Tx Interval: %4u ms",
+ GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
+ ND_PRINT("\n\t Required min Rx Interval: %4u ms",
+ GET_BE_U_4(bfd_header->required_min_rx_interval)/1000);
+ ND_PRINT("\n\t Required min Echo Interval: %4u ms",
+ GET_BE_U_4(bfd_header->required_min_echo_interval)/1000);
+
+ if (flags & BFD_FLAG_AUTH) {
+ auth_print(ndo, pptr);
+ }
+ break;
- ND_PRINT((ndo, "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)", (flags & 0xc0) >> 6),
- bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
- tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
- BFD_EXTRACT_DIAG(version_diag)));
-
- ND_PRINT((ndo, "\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
- EXTRACT_U_1(bfd_header->detect_time_multiplier),
- EXTRACT_U_1(bfd_header->detect_time_multiplier) * EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
- EXTRACT_U_1(bfd_header->length)));
-
-
- ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->my_discriminator)));
- ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->your_discriminator)));
- ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000));
- ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_rx_interval)/1000));
- ND_PRINT((ndo, "\n\t Required min Echo Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_echo_interval)/1000));
-
- if (flags & BFD_FLAG_AUTH) {
- if (auth_print(ndo, pptr))
- goto trunc;
+ default:
+ ND_PRINT("BFDv%u, Control, length: %u",
+ version,
+ len);
+ if (ndo->ndo_vflag >= 1) {
+ if(!print_unknown_data(ndo, pptr,"\n\t",len))
+ return;
+ }
+ break;
}
- break;
-
- /* BFDv0 */
- case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */
- /* BFDv1 */
- case (BFD_ECHO_PORT << 8 | 1):
-
- default:
- ND_PRINT((ndo, "BFD, %s, length: %u",
- tok2str(bfd_port_values, "unknown (%u)", port),
- len));
+ } else if (port == BFD_ECHO_PORT) {
+ /*
+ * Echo packet.
+ */
+ ND_PRINT("BFD, Echo, length: %u",
+ len);
+ if (ndo->ndo_vflag >= 1) {
+ if(!print_unknown_data(ndo, pptr,"\n\t",len))
+ return;
+ }
+ } else {
+ /*
+ * Unknown packet type.
+ */
+ ND_PRINT("BFD, unknown (%u), length: %u",
+ port,
+ len);
if (ndo->ndo_vflag >= 1) {
if(!print_unknown_data(ndo, pptr,"\n\t",len))
return;
}
- break;
}
- return;
-
-trunc:
- ND_PRINT((ndo, "[|BFD]"));
}
-/*
- * Local Variables:
- * c-style: whitesmith
- * c-basic-offset: 8
- * End:
- */
projects / tcpdump / blobdiff