void
dvmrp_print(netdissect_options *ndo,
register const u_char *bp, register u_int len)
{
register const u_char *ep;
register u_char type;
ep = (const u_char *)ndo->ndo_snapend;
if (bp >= ep)
return;
ND_TCHECK(bp[1]);
type = bp[1];
/* Skip IGMP header */
bp += 8;
len -= 8;
switch (type) {
case DVMRP_PROBE:
ND_PRINT((ndo, " Probe"));
if (ndo->ndo_vflag) {
if (print_probe(ndo, bp, ep, len) < 0)
goto trunc;
}
break;
case DVMRP_REPORT:
ND_PRINT((ndo, " Report"));
if (ndo->ndo_vflag > 1) {
if (print_report(ndo, bp, ep, len) < 0)
goto trunc;
}
break;
case DVMRP_ASK_NEIGHBORS:
ND_PRINT((ndo, " Ask-neighbors(old)"));
break;
case DVMRP_NEIGHBORS:
ND_PRINT((ndo, " Neighbors(old)"));
if (print_neighbors(ndo, bp, ep, len) < 0)
goto trunc;
break;
case DVMRP_ASK_NEIGHBORS2:
ND_PRINT((ndo, " Ask-neighbors2"));
break;
case DVMRP_NEIGHBORS2:
ND_PRINT((ndo, " Neighbors2"));
/*
* extract version and capabilities from IGMP group
* address field
*/
bp -= 4;
ND_TCHECK2(bp[0], 4);
target_level = (bp[0] << 24) | (bp[1] << 16) |
(bp[2] << 8) | bp[3];
bp += 4;
if (print_neighbors2(ndo, bp, ep, len) < 0)
goto trunc;
break;
case DVMRP_PRUNE:
ND_PRINT((ndo, " Prune"));
if (print_prune(ndo, bp) < 0)
goto trunc;
break;
case DVMRP_GRAFT:
ND_PRINT((ndo, " Graft"));
if (print_graft(ndo, bp) < 0)
goto trunc;
break;
case DVMRP_GRAFT_ACK:
ND_PRINT((ndo, " Graft-ACK"));
if (print_graft_ack(ndo, bp) < 0)
goto trunc;
break;
default:
ND_PRINT((ndo, " [type %d]", type));
break;
}
return;
trunc:
ND_PRINT((ndo, "[|dvmrp]"));
return;
}
void
dvmrp_print(netdissect_options *ndo,
const u_char *bp, u_int len)
{
const u_char *ep;
u_char type;
uint8_t major_version, minor_version;
ndo->ndo_protocol = "dvmrp";
ep = ndo->ndo_snapend;
if (bp >= ep)
return;
ND_TCHECK_1(bp + 1);
type = GET_U_1(bp + 1);
/* Skip IGMP header */
bp += 8;
len -= 8;
switch (type) {
case DVMRP_PROBE:
ND_PRINT(" Probe");
if (ndo->ndo_vflag) {
if (print_probe(ndo, bp, ep, len) < 0)
goto trunc;
}
break;
case DVMRP_REPORT:
ND_PRINT(" Report");
if (ndo->ndo_vflag > 1) {
if (print_report(ndo, bp, ep, len) < 0)
goto trunc;
}
break;
case DVMRP_ASK_NEIGHBORS:
ND_PRINT(" Ask-neighbors(old)");
break;
case DVMRP_NEIGHBORS:
ND_PRINT(" Neighbors(old)");
if (print_neighbors(ndo, bp, ep, len) < 0)
goto trunc;
break;
case DVMRP_ASK_NEIGHBORS2:
ND_PRINT(" Ask-neighbors2");
break;
case DVMRP_NEIGHBORS2:
ND_PRINT(" Neighbors2");
/*
* extract version from IGMP group address field
*/
bp -= 4;
ND_TCHECK_4(bp);
major_version = GET_U_1(bp + 3);
minor_version = GET_U_1(bp + 2);
bp += 4;
if (print_neighbors2(ndo, bp, ep, len, major_version,
minor_version) < 0)
goto trunc;
break;
case DVMRP_PRUNE:
ND_PRINT(" Prune");
if (print_prune(ndo, bp) < 0)
goto trunc;
break;
case DVMRP_GRAFT:
ND_PRINT(" Graft");
if (print_graft(ndo, bp) < 0)
goto trunc;
break;
case DVMRP_GRAFT_ACK:
ND_PRINT(" Graft-ACK");
if (print_graft_ack(ndo, bp) < 0)
goto trunc;
break;
default:
ND_PRINT(" [type %u]", type);
break;
}
return;
trunc:
nd_print_trunc(ndo);
return;
}