/* \summary: IPv6 mobility printer */
/* RFC 3775 */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
-#include <netdissect-stdinc.h>
+#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "ip6.h"
-static const char tstr[] = "[|MOBILITY]";
/* Mobility header */
struct ip6_mobility {
- uint8_t ip6m_pproto; /* following payload protocol (for PG) */
- uint8_t ip6m_len; /* length in units of 8 octets */
- uint8_t ip6m_type; /* message type */
- uint8_t reserved; /* reserved */
- uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
+ nd_uint8_t ip6m_pproto; /* following payload protocol (for PG) */
+ nd_uint8_t ip6m_len; /* length in units of 8 octets */
+ nd_uint8_t ip6m_type; /* message type */
+ nd_uint8_t reserved; /* reserved */
+ nd_uint16_t ip6m_cksum; /* sum of IPv6 pseudo-header and MH */
union {
- uint16_t ip6m_un_data16[1]; /* type-specific field */
- uint8_t ip6m_un_data8[2]; /* type-specific field */
+ nd_uint16_t ip6m_un_data16[1]; /* type-specific field */
+ nd_uint8_t ip6m_un_data8[2]; /* type-specific field */
} ip6m_dataun;
};
#define IP6M_MINLEN 8
-/* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
+/* https://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
/* message type */
#define IP6M_BINDING_REQUEST 0 /* Binding Refresh Request */
#define IP6MOPT_AUTH 0x5 /* Binding Authorization Data */
#define IP6MOPT_AUTH_MINLEN 12
+static const struct tok ip6m_binding_update_bits [] = {
+ { 0x08, "A" },
+ { 0x04, "H" },
+ { 0x02, "L" },
+ { 0x01, "K" },
+ { 0, NULL }
+};
+
static int
mobility_opt_print(netdissect_options *ndo,
const u_char *bp, const unsigned len)
unsigned i, optlen;
for (i = 0; i < len; i += optlen) {
- ND_TCHECK(bp[i]);
- if (bp[i] == IP6MOPT_PAD1)
+ if (GET_U_1(bp + i) == IP6MOPT_PAD1)
optlen = 1;
else {
if (i + 1 < len) {
- ND_TCHECK(bp[i + 1]);
- optlen = bp[i + 1] + 2;
- }
- else
+ optlen = GET_U_1(bp + i + 1) + 2;
+ } else
goto trunc;
}
if (i + optlen > len)
goto trunc;
- ND_TCHECK(bp[i + optlen]);
+ ND_TCHECK_1(bp + i + optlen);
- switch (bp[i]) {
+ switch (GET_U_1(bp + i)) {
case IP6MOPT_PAD1:
- ND_PRINT((ndo, "(pad1)"));
+ ND_PRINT("(pad1)");
break;
case IP6MOPT_PADN:
if (len - i < IP6MOPT_MINLEN) {
- ND_PRINT((ndo, "(padn: trunc)"));
+ ND_PRINT("(padn: trunc)");
goto trunc;
}
- ND_PRINT((ndo, "(padn)"));
+ ND_PRINT("(padn)");
break;
case IP6MOPT_REFRESH:
if (len - i < IP6MOPT_REFRESH_MINLEN) {
- ND_PRINT((ndo, "(refresh: trunc)"));
+ ND_PRINT("(refresh: trunc)");
goto trunc;
}
/* units of 4 secs */
- ND_TCHECK_2(bp + i + 2);
- ND_PRINT((ndo, "(refresh: %u)",
- EXTRACT_BE_U_2(bp + i + 2) << 2));
+ ND_PRINT("(refresh: %u)",
+ GET_BE_U_2(bp + i + 2) << 2);
break;
case IP6MOPT_ALTCOA:
if (len - i < IP6MOPT_ALTCOA_MINLEN) {
- ND_PRINT((ndo, "(altcoa: trunc)"));
+ ND_PRINT("(altcoa: trunc)");
goto trunc;
}
- ND_TCHECK_16(bp + i + 2);
- ND_PRINT((ndo, "(alt-CoA: %s)", ip6addr_string(ndo, &bp[i+2])));
+ ND_PRINT("(alt-CoA: %s)", GET_IP6ADDR_STRING(bp + i + 2));
break;
case IP6MOPT_NONCEID:
if (len - i < IP6MOPT_NONCEID_MINLEN) {
- ND_PRINT((ndo, "(ni: trunc)"));
+ ND_PRINT("(ni: trunc)");
goto trunc;
}
- ND_TCHECK_2(bp + i + 2);
- ND_TCHECK_2(bp + i + 4);
- ND_PRINT((ndo, "(ni: ho=0x%04x co=0x%04x)",
- EXTRACT_BE_U_2(bp + i + 2),
- EXTRACT_BE_U_2(bp + i + 4)));
+ ND_PRINT("(ni: ho=0x%04x co=0x%04x)",
+ GET_BE_U_2(bp + i + 2),
+ GET_BE_U_2(bp + i + 4));
break;
case IP6MOPT_AUTH:
if (len - i < IP6MOPT_AUTH_MINLEN) {
- ND_PRINT((ndo, "(auth: trunc)"));
+ ND_PRINT("(auth: trunc)");
goto trunc;
}
- ND_PRINT((ndo, "(auth)"));
+ ND_PRINT("(auth)");
break;
default:
if (len - i < IP6MOPT_MINLEN) {
- ND_PRINT((ndo, "(sopt_type %u: trunc)", bp[i]));
+ ND_PRINT("(sopt_type %u: trunc)",
+ GET_U_1(bp + i));
goto trunc;
}
- ND_PRINT((ndo, "(type-0x%02x: len=%u)", bp[i], bp[i + 1]));
+ ND_PRINT("(type-0x%02x: len=%u)", GET_U_1(bp + i),
+ GET_U_1(bp + i + 1));
break;
}
}
unsigned mhlen, hlen;
uint8_t type;
+ ndo->ndo_protocol = "mobility";
mh = (const struct ip6_mobility *)bp;
/* 'ep' points to the end of available data. */
ep = ndo->ndo_snapend;
- if (!ND_TTEST(mh->ip6m_len)) {
+ if (!ND_TTEST_1(mh->ip6m_len)) {
/*
* There's not enough captured data to include the
* mobility header length.
* returned length, however, as it breaks out of the
* header-processing loop.
*/
- mhlen = ep - bp;
+ mhlen = (unsigned)(ep - bp);
goto trunc;
}
- mhlen = (mh->ip6m_len + 1) << 3;
+ mhlen = (GET_U_1(mh->ip6m_len) + 1) << 3;
/* XXX ip6m_cksum */
- ND_TCHECK(mh->ip6m_type);
- type = mh->ip6m_type;
+ type = GET_U_1(mh->ip6m_type);
if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
- ND_PRINT((ndo, "(header length %u is too small for type %u)", mhlen, type));
+ ND_PRINT("(header length %u is too small for type %u)", mhlen, type);
goto trunc;
}
- ND_PRINT((ndo, "mobility: %s", tok2str(ip6m_str, "type-#%u", type)));
+ ND_PRINT("mobility: %s", tok2str(ip6m_str, "type-#%u", type));
switch (type) {
case IP6M_BINDING_REQUEST:
hlen = IP6M_MINLEN;
case IP6M_CAREOF_TEST_INIT:
hlen = IP6M_MINLEN;
if (ndo->ndo_vflag) {
- ND_TCHECK_4(bp + hlen + 4);
- ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
+ ND_PRINT(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
- EXTRACT_BE_U_4(bp + hlen),
- EXTRACT_BE_U_4(bp + hlen + 4)));
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
break;
case IP6M_HOME_TEST:
case IP6M_CAREOF_TEST:
- ND_TCHECK(mh->ip6m_data16[0]);
- ND_PRINT((ndo, " nonce id=0x%x", EXTRACT_BE_U_2(&mh->ip6m_data16[0])));
+ ND_PRINT(" nonce id=0x%x", GET_BE_U_2(mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
if (ndo->ndo_vflag) {
- ND_TCHECK_4(bp + hlen + 4);
- ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
+ ND_PRINT(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
- EXTRACT_BE_U_4(bp + hlen),
- EXTRACT_BE_U_4(bp + hlen + 4)));
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
if (ndo->ndo_vflag) {
- ND_TCHECK_4(bp + hlen + 4);
- ND_PRINT((ndo, " %s Keygen Token=%08x:%08x",
+ ND_PRINT(" %s Keygen Token=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
- EXTRACT_BE_U_4(bp + hlen),
- EXTRACT_BE_U_4(bp + hlen + 4)));
+ GET_BE_U_4(bp + hlen),
+ GET_BE_U_4(bp + hlen + 4));
}
hlen += 8;
break;
case IP6M_BINDING_UPDATE:
- ND_TCHECK(mh->ip6m_data16[0]);
- ND_PRINT((ndo, " seq#=%u", EXTRACT_BE_U_2(&mh->ip6m_data16[0])));
+ {
+ int bits;
+ ND_PRINT(" seq#=%u", GET_BE_U_2(mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
ND_TCHECK_2(bp + hlen);
- if (bp[hlen] & 0xf0) {
- ND_PRINT((ndo, " "));
- if (bp[hlen] & 0x80)
- ND_PRINT((ndo, "A"));
- if (bp[hlen] & 0x40)
- ND_PRINT((ndo, "H"));
- if (bp[hlen] & 0x20)
- ND_PRINT((ndo, "L"));
- if (bp[hlen] & 0x10)
- ND_PRINT((ndo, "K"));
+ bits = (GET_U_1(bp + hlen) & 0xf0) >> 4;
+ if (bits) {
+ ND_PRINT(" ");
+ ND_PRINT("%s",
+ bittok2str_nosep(ip6m_binding_update_bits,
+ "bits-#0x%x", bits));
}
/* Reserved (4bits) */
hlen += 1;
/* Reserved (8bits) */
hlen += 1;
- ND_TCHECK_2(bp + hlen);
/* units of 4 secs */
- ND_PRINT((ndo, " lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2));
+ ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
hlen += 2;
break;
+ }
case IP6M_BINDING_ACK:
- ND_TCHECK(mh->ip6m_data8[0]);
- ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
- ND_TCHECK(mh->ip6m_data8[1]);
- if (mh->ip6m_data8[1] & 0x80)
- ND_PRINT((ndo, " K"));
+ ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
+ if (GET_U_1(mh->ip6m_data8[1]) & 0x80)
+ ND_PRINT(" K");
/* Reserved (7bits) */
hlen = IP6M_MINLEN;
- ND_TCHECK_2(bp + hlen);
- ND_PRINT((ndo, " seq#=%u", EXTRACT_BE_U_2(bp + hlen)));
+ ND_PRINT(" seq#=%u", GET_BE_U_2(bp + hlen));
hlen += 2;
- ND_TCHECK_2(bp + hlen);
/* units of 4 secs */
- ND_PRINT((ndo, " lifetime=%u", EXTRACT_BE_U_2(bp + hlen) << 2));
+ ND_PRINT(" lifetime=%u", GET_BE_U_2(bp + hlen) << 2);
hlen += 2;
break;
case IP6M_BINDING_ERROR:
- ND_TCHECK(mh->ip6m_data8[0]);
- ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
+ ND_PRINT(" status=%u", GET_U_1(mh->ip6m_data8[0]));
/* Reserved */
hlen = IP6M_MINLEN;
- ND_TCHECK2(bp[hlen], 16);
- ND_PRINT((ndo, " homeaddr %s", ip6addr_string(ndo, &bp[hlen])));
+ ND_PRINT(" homeaddr %s", GET_IP6ADDR_STRING(bp + hlen));
hlen += 16;
break;
default:
- ND_PRINT((ndo, " len=%u", mh->ip6m_len));
+ ND_PRINT(" len=%u", GET_U_1(mh->ip6m_len));
return(mhlen);
- break;
}
if (ndo->ndo_vflag)
- if (mobility_opt_print(ndo, &bp[hlen], mhlen - hlen))
+ if (mobility_opt_print(ndo, bp + hlen, mhlen - hlen))
goto trunc;
return(mhlen);
trunc:
- ND_PRINT((ndo, "%s", tstr));
+ nd_print_trunc(ndo);
return(-1);
}
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