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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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.
*/
/* \summary: IPv6 routing header printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip6.h"
static const struct tok srh_tlv_type[] = {
{ IPV6_SRH_TLV_PAD1, "Pad1"},
{ IPV6_SRH_TLV_PADN, "PadN"},
{ IPV6_SRH_TLV_HMAC, "HMAC"},
{ 0, NULL }
};
static int
srh_tlv_print(netdissect_options *ndo, const u_char *p, u_int bytes_left)
{
u_int tlv_type, tlv_len;
while (bytes_left != 0) {
tlv_type = GET_U_1(p);
ND_PRINT(", TLV-type=%s(%u)",
tok2str(srh_tlv_type, "Unknown", tlv_type),
tlv_type);
ND_ICHECKMSG_U("remaining length", bytes_left, <, 1);
p += 1;
bytes_left -= 1;
if (bytes_left == 0)
break;
if (tlv_type == IPV6_SRH_TLV_PAD1)
continue;
tlv_len = GET_U_1(p);
ND_PRINT(", TLV-len=%u", tlv_len);
ND_ICHECKMSG_U("remaining length", bytes_left, <, 1);
p += 1;
bytes_left -= 1;
switch (tlv_type) {
case IPV6_SRH_TLV_PADN:
ND_ICHECKMSG_U("PadN length", tlv_len, >, 5); /* RFC 8754 */
ND_ICHECKMSG_U("remaining length", bytes_left, <, tlv_len);
p += tlv_len;
bytes_left -= tlv_len;
break;
case IPV6_SRH_TLV_HMAC:
ND_ICHECKMSG_U("remaining length", bytes_left, <, 6);
uint16_t reserved;
uint32_t key_id;
uint8_t hmac_byte;
reserved = GET_BE_U_2(p);
p += 2;
if (ndo->ndo_vflag)
ND_PRINT(", D=%u", reserved >> 15);
if (ndo->ndo_vflag && (reserved & 0x7fff) != 0)
ND_PRINT(", reserved MBZ %u", reserved & 0x7fff);
key_id = GET_BE_U_4(p);
p += 4;
if (ndo->ndo_vflag)
ND_PRINT(", HMAC-key-ID=0x%02x", key_id);
bytes_left -= 6;
if (ndo->ndo_vflag)
ND_PRINT(", HMAC=0x");
for (u_int i = 0; i < tlv_len; i++) {
hmac_byte = GET_U_1(p);
ND_ICHECKMSG_U("remaining length", bytes_left, <, 1);
p += 1;
bytes_left -= 1;
if (ndo->ndo_vflag)
ND_PRINT("%02x", hmac_byte);
}
break;
default: /* Unknown type */
if (ndo->ndo_vflag)
ND_PRINT(", TLV-value=0x");
ND_ICHECKMSG_U("remaining length", bytes_left, <, tlv_len);
uint8_t tlv_byte;
for (u_int i = 0; i < tlv_len; i++) {
tlv_byte = GET_U_1(p);
p += 1;
bytes_left -= 1;
if (ndo->ndo_vflag)
ND_PRINT("%02x", tlv_byte);
}
break;
}
}
return 0;
invalid:
return -1;
}
int
rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_)
{
const struct ip6_rthdr *dp;
const struct ip6_rthdr0 *dp0;
const struct ip6_srh *srh;
u_int i, len, type, seg_list_len, last_entry;
int err;
const u_char *p;
ndo->ndo_protocol = "rt6";
nd_print_protocol_caps(ndo);
dp = (const struct ip6_rthdr *)bp;
len = GET_U_1(dp->ip6r_len);
ND_PRINT(" (len=%u", len); /*)*/
type = GET_U_1(dp->ip6r_type);
ND_PRINT(", type=%u", type);
if (type == IPV6_RTHDR_TYPE_0)
ND_PRINT(" [Deprecated]");
ND_PRINT(", segleft=%u", GET_U_1(dp->ip6r_segleft));
switch (type) {
case IPV6_RTHDR_TYPE_0:
case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
dp0 = (const struct ip6_rthdr0 *)dp;
if (GET_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
ND_PRINT(", rsv=0x%0x",
GET_BE_U_4(dp0->ip6r0_reserved));
}
if (len % 2 == 1) {
ND_PRINT(" [length %u]", len);
goto invalid;
}
len >>= 1;
p = (const u_char *) dp0->ip6r0_addr;
for (i = 0; i < len; i++) {
ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
p += 16;
}
/*(*/
ND_PRINT(") ");
return((GET_U_1(dp0->ip6r0_len) + 1) << 3);
break;
case IPV6_RTHDR_TYPE_4:
srh = (const struct ip6_srh *)dp;
last_entry = GET_U_1(srh->srh_last_ent);
ND_PRINT(", last-entry=%u", last_entry);
if (GET_U_1(srh->srh_flags) || ndo->ndo_vflag) {
ND_PRINT(", flags=0x%0x",
GET_U_1(srh->srh_flags));
}
ND_PRINT(", tag=%x", GET_BE_U_2(srh->srh_tag));
p = (const u_char *) srh->srh_segments;
for (i = 0; i < last_entry + 1; i++) {
ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
p += 16;
}
seg_list_len = (last_entry + 1) * 2;
if (seg_list_len < len) {
/* there is TLV */
u_int bytes_left;
bytes_left = (len - seg_list_len) * 8;
err = srh_tlv_print(ndo, p, bytes_left);
if (err)
goto invalid;
}
/*(*/
ND_PRINT(") ");
return((GET_U_1(srh->srh_len) + 1) << 3);
break;
default:
ND_PRINT(" (unknown type)");
goto invalid;
}
invalid:
nd_print_invalid(ndo);
return -1;
}
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