u_int
chdlc_print(register const u_char *p, u_int length) {
u_int proto;
proto = EXTRACT_16BITS(&p[2]);
if (eflag) {
printf("%s, ethertype %s (0x%04x), length %u: ",
tok2str(chdlc_cast_values, "0x%02x", p[0]),
tok2str(ethertype_values, "Unknown", proto),
proto,
length);
}
length -= CHDLC_HDRLEN;
p += CHDLC_HDRLEN;
switch (proto) {
case ETHERTYPE_IP:
ip_print(gndo, p, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print(p, length);
break;
#endif
case CHDLC_TYPE_SLARP:
chdlc_slarp_print(p, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print(p, length);
break;
#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print(p, length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
if (*(p+1) == 0x81 ||
*(p+1) == 0x82 ||
*(p+1) == 0x83)
isoclns_print(p+1, length-1, length-1);
else
isoclns_print(p, length, length);
break;
default:
if (!eflag)
printf("unknown CHDLC protocol (0x%04x)", proto);
break;
}
return (CHDLC_HDRLEN);
}
u_int
chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length)
{
u_int proto;
const u_char *bp = p;
if (length < CHDLC_HDRLEN)
goto trunc;
ND_TCHECK2(*p, CHDLC_HDRLEN);
proto = EXTRACT_16BITS(&p[2]);
if (ndo->ndo_eflag) {
ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ",
tok2str(chdlc_cast_values, "0x%02x", p[0]),
tok2str(ethertype_values, "Unknown", proto),
proto,
length));
}
length -= CHDLC_HDRLEN;
p += CHDLC_HDRLEN;
switch (proto) {
case ETHERTYPE_IP:
ip_print(ndo, p, length);
break;
case ETHERTYPE_IPV6:
ip6_print(ndo, p, length);
break;
case CHDLC_TYPE_SLARP:
chdlc_slarp_print(ndo, p, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print(p, length);
break;
#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print(ndo, p, length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
if (length < 2)
goto trunc;
ND_TCHECK_16BITS(p);
if (*(p+1) == 0x81 ||
*(p+1) == 0x82 ||
*(p+1) == 0x83)
isoclns_print(ndo, p + 1, length - 1);
else
isoclns_print(ndo, p, length);
break;
default:
if (!ndo->ndo_eflag)
ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto));
break;
}
return (CHDLC_HDRLEN);
trunc:
ND_PRINT((ndo, "[|chdlc]"));
return ndo->ndo_snapend - bp;
}
u_int
chdlc_print(netdissect_options *ndo, const u_char *p, u_int length)
{
u_int proto;
const u_char *bp = p;
ndo->ndo_protocol = "chdlc";
if (length < CHDLC_HDRLEN)
goto trunc;
ND_TCHECK_LEN(p, CHDLC_HDRLEN);
proto = GET_BE_U_2(p + 2);
if (ndo->ndo_eflag) {
ND_PRINT("%s, ethertype %s (0x%04x), length %u: ",
tok2str(chdlc_cast_values, "0x%02x", GET_U_1(p)),
tok2str(ethertype_values, "Unknown", proto),
proto,
length);
}
length -= CHDLC_HDRLEN;
p += CHDLC_HDRLEN;
switch (proto) {
case ETHERTYPE_IP:
ip_print(ndo, p, length);
break;
case ETHERTYPE_IPV6:
ip6_print(ndo, p, length);
break;
case CHDLC_TYPE_SLARP:
chdlc_slarp_print(ndo, p, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print(p, length);
break;
#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print(ndo, p, length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
if (length < 2)
goto trunc;
ND_TCHECK_2(p);
if (GET_U_1(p + 1) == NLPID_CLNP ||
GET_U_1(p + 1) == NLPID_ESIS ||
GET_U_1(p + 1) == NLPID_ISIS)
isoclns_print(ndo, p + 1, length - 1);
else
isoclns_print(ndo, p, length);
break;
default:
if (!ndo->ndo_eflag)
ND_PRINT("unknown CHDLC protocol (0x%04x)", proto);
break;
}
return (CHDLC_HDRLEN);
trunc:
nd_print_trunc(ndo);
return (ND_BYTES_AVAILABLE_AFTER(bp));
}
