void
slow_print(register const u_char *pptr, register u_int len) {
int print_version;
slow_com_header = (const struct slow_common_header_t *)pptr;
TCHECK(*slow_com_header);
/*
* Sanity checking of the header.
*/
switch (slow_com_header->proto_subtype) {
case SLOW_PROTO_LACP:
if (slow_com_header->version != LACP_VERSION) {
printf("LACP version %u packet not supported",slow_com_header->version);
return;
}
print_version = 1;
break;
case SLOW_PROTO_MARKER:
if (slow_com_header->version != MARKER_VERSION) {
printf("MARKER version %u packet not supported",slow_com_header->version);
return;
}
print_version = 1;
break;
case SLOW_PROTO_OAM: /* fall through */
print_version = 0;
break;
default:
/* print basic information and exit */
print_version = -1;
break;
}
if (print_version) {
printf("%sv%u, length %u",
tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
slow_com_header->version,
len);
} else {
/* some slow protos don't have a version number in the header */
printf("%s, length %u",
tok2str(slow_proto_values, "unknown (%u)",slow_com_header->proto_subtype),
len);
}
/* unrecognized subtype */
if (print_version == -1) {
print_unknown_data(pptr, "\n\t", len);
return;
}
if (!vflag)
return;
switch (slow_com_header->proto_subtype) {
default: /* should not happen */
break;
case SLOW_PROTO_OAM:
/* skip proto_subtype */
slow_oam_print(pptr+1, len-1);
break;
case SLOW_PROTO_LACP: /* LACP and MARKER share the same semantics */
case SLOW_PROTO_MARKER:
/* skip slow_common_header */
len -= sizeof(const struct slow_common_header_t);
pptr += sizeof(const struct slow_common_header_t);
slow_marker_lacp_print(pptr, len);
break;
}
return;
trunc:
printf("\n\t\t packet exceeded snapshot");
}
void
slow_print(netdissect_options *ndo,
const u_char *pptr, u_int len)
{
int print_version;
u_int subtype;
ndo->ndo_protocol = "slow";
if (len < 1)
goto tooshort;
ND_TCHECK_1(pptr);
subtype = EXTRACT_U_1(pptr);
/*
* Sanity checking of the header.
*/
switch (subtype) {
case SLOW_PROTO_LACP:
if (len < 2)
goto tooshort;
ND_TCHECK_1(pptr + 1);
if (EXTRACT_U_1(pptr + 1) != LACP_VERSION) {
ND_PRINT("LACP version %u packet not supported", EXTRACT_U_1(pptr + 1));
return;
}
print_version = 1;
break;
case SLOW_PROTO_MARKER:
if (len < 2)
goto tooshort;
ND_TCHECK_1(pptr + 1);
if (EXTRACT_U_1(pptr + 1) != MARKER_VERSION) {
ND_PRINT("MARKER version %u packet not supported", EXTRACT_U_1(pptr + 1));
return;
}
print_version = 1;
break;
case SLOW_PROTO_OAM: /* fall through */
print_version = 0;
break;
default:
/* print basic information and exit */
print_version = -1;
break;
}
if (print_version == 1) {
ND_PRINT("%sv%u, length %u",
tok2str(slow_proto_values, "unknown (%u)", subtype),
EXTRACT_U_1((pptr + 1)),
len);
} else {
/* some slow protos don't have a version number in the header */
ND_PRINT("%s, length %u",
tok2str(slow_proto_values, "unknown (%u)", subtype),
len);
}
/* unrecognized subtype */
if (print_version == -1) {
print_unknown_data(ndo, pptr, "\n\t", len);
return;
}
if (!ndo->ndo_vflag)
return;
switch (subtype) {
default: /* should not happen */
break;
case SLOW_PROTO_OAM:
/* skip subtype */
len -= 1;
pptr += 1;
slow_oam_print(ndo, pptr, len);
break;
case SLOW_PROTO_LACP: /* LACP and MARKER share the same semantics */
case SLOW_PROTO_MARKER:
/* skip subtype and version */
len -= 2;
pptr += 2;
slow_marker_lacp_print(ndo, pptr, len, subtype);
break;
}
return;
tooshort:
if (!ndo->ndo_vflag)
ND_PRINT(" (packet is too short)");
else
ND_PRINT("\n\t\t packet is too short");
return;
trunc:
ND_PRINT("%s", tstr);
}