*/
/* \summary: Babel Routing Protocol printer */
+/* Specifications:
+ *
+ * RFC 6126
+ * RFC 7298
+ * RFC 7557
+ * draft-ietf-babel-rfc6126bis-17
+ * draft-ietf-babel-hmac-10
+ * draft-ietf-babel-source-specific-0
+ */
-#ifdef HAVE_CONFIG_H
#include <config.h>
-#endif
#include "netdissect-stdinc.h"
#include "addrtoname.h"
#include "extract.h"
-
static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
void
const u_char *cp, u_int length)
{
ndo->ndo_protocol = "babel";
- ND_PRINT("babel");
+ nd_print_protocol(ndo);
ND_TCHECK_4(cp);
trunc:
nd_print_trunc(ndo);
- return;
}
/* TLVs */
#define MESSAGE_UPDATE_SRC_SPECIFIC 13 /* last appearance in draft-boutier-babel-source-specific-01 */
#define MESSAGE_REQUEST_SRC_SPECIFIC 14 /* idem */
#define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15 /* idem */
+#define MESSAGE_MAC 16
+#define MESSAGE_PC 17
+#define MESSAGE_CHALLENGE_REQUEST 18
+#define MESSAGE_CHALLENGE_REPLY 19
/* sub-TLVs */
#define MESSAGE_SUB_PAD1 0
#define MESSAGE_SUB_DIVERSITY 2
#define MESSAGE_SUB_TIMESTAMP 3
+/* "Mandatory" bit in sub-TLV types */
+#define MANDATORY_MASK 0x80
+
+/* Flags for the Hello TLV */
+#define UNICAST_MASK 0x8000
+
/* Diversity sub-TLV channel codes */
static const struct tok diversity_str[] = {
{ 0, "reserved" },
format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen)
{
static char buf[50];
+
+ /*
+ * prefix points to a buffer on the stack into which the prefix has
+ * been placed, so we can't use GET_IPADDR_STRING() or
+ * GET_IP6ADDR_STRING() on it.
+ */
if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
else
static const char *
format_address(netdissect_options *ndo, const u_char *prefix)
{
+ /*
+ * prefix points to a buffer on the stack into which the prefix has
+ * been placed, so we can't use GET_IPADDR_STRING() or
+ * GET_IP6ADDR_STRING() on it.
+ */
if(memcmp(prefix, v4prefix, 12) == 0)
return ipaddr_string(ndo, prefix + 12);
else
ND_PRINT(" sub-pad1");
continue;
}
+ if ((MANDATORY_MASK & subtype) != 0)
+ ND_PRINT(" (M)");
if(cp == ep)
goto invalid;
sublen = GET_U_1(cp);
}
#define ICHECK(i, l) \
- if ((i) + (l) > bodylen || (i) + (l) > length) goto invalid;
+ if ((i) + (l) > tlvs_length || (i) + (l) > packet_length_remaining) \
+ goto invalid;
-static void
-babel_print_v2(netdissect_options *ndo,
- const u_char *cp, u_int length)
+static int
+babel_print_v2_tlvs(netdissect_options *ndo,
+ const u_char *cp, u_int tlvs_length,
+ u_int packet_length_remaining)
{
u_int i;
- u_short bodylen;
u_char v4_prefix[16] =
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
u_char v6_prefix[16] = {0};
- ND_TCHECK_4(cp);
- if (length < 4)
- goto invalid;
- bodylen = GET_BE_U_2(cp + 2);
- ND_PRINT(" (%u)", bodylen);
- if (4U + bodylen > length)
- goto invalid;
-
- /* Process the TLVs in the body */
i = 0;
- while(i < bodylen) {
+ while(i < tlvs_length) {
const u_char *message;
uint8_t type;
u_int len;
- message = cp + 4 + i;
+ message = cp + i;
- ND_TCHECK_1(message);
+ ICHECK(i, 1);
if((type = GET_U_1(message)) == MESSAGE_PAD1) {
ND_PRINT(ndo->ndo_vflag ? "\n\tPad 1" : " pad1");
i += 1;
continue;
}
- ND_TCHECK_2(message);
ICHECK(i, 2);
+ ND_TCHECK_2(message);
len = GET_U_1(message + 1);
- ND_TCHECK_LEN(message, 2 + len);
ICHECK(i, 2 + len);
+ ND_TCHECK_LEN(message, 2 + len);
switch(type) {
case MESSAGE_PADN: {
break;
case MESSAGE_HELLO: {
- u_short seqno, interval;
+ u_short seqno, interval, unicast;
if (!ndo->ndo_vflag)
ND_PRINT(" hello");
else {
ND_PRINT("\n\tHello ");
if(len < 6) goto invalid;
+ unicast = (GET_BE_U_2(message + 2) & UNICAST_MASK);
seqno = GET_BE_U_2(message + 4);
interval = GET_BE_U_2(message + 6);
- ND_PRINT("seqno %u interval %s", seqno, format_interval(interval));
+ if(unicast)
+ ND_PRINT("(Unicast) ");
+ ND_PRINT("seqno %u ", seqno);
+ if(interval!=0)
+ ND_PRINT("interval %s", format_interval(interval));
+ else
+ ND_PRINT("unscheduled");
/* Extra data. */
if(len > 6)
subtlvs_print(ndo, message + 8, message + 2 + len, type);
}
break;
+ case MESSAGE_MAC: {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" mac");
+ else {
+ ND_PRINT("\n\tMAC ");
+ ND_PRINT("len %u", len);
+ }
+ }
+ break;
+
+ case MESSAGE_PC: {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" pc");
+ else {
+ ND_PRINT("\n\tPC");
+ if(len < 4) goto invalid;
+ ND_PRINT(" value %u",
+ GET_BE_U_4(message + 2));
+ ND_PRINT(" index len %u", len-4);
+ }
+ }
+ break;
+
+ case MESSAGE_CHALLENGE_REQUEST: {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" challenge_request");
+ else {
+ ND_PRINT("\n\tChallenge Request");
+ if(len > 192) goto invalid;
+ ND_PRINT(" len %u", len);
+ }
+ }
+ break;
+
+ case MESSAGE_CHALLENGE_REPLY: {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" challenge_reply");
+ else {
+ ND_PRINT("\n\tChallenge Reply");
+ if (len > 192) goto invalid;
+ ND_PRINT(" len %u", len);
+ }
+ }
+ break;
+
default:
if (!ndo->ndo_vflag)
ND_PRINT(" unknown");
}
i += len + 2;
}
+
+ return 0; /* OK */
+
+trunc:
+ return -1; /* packet truncated by capture process */
+
+invalid:
+ return -2; /* packet is invalid */
+}
+
+static void
+babel_print_v2(netdissect_options *ndo,
+ const u_char *cp, u_int length)
+{
+ u_short bodylen;
+ int ret;
+
+ ND_TCHECK_4(cp);
+ if (length < 4)
+ goto invalid;
+ bodylen = GET_BE_U_2(cp + 2);
+ ND_PRINT(" (%u)", bodylen);
+ length -= 4;
+ cp += 4;
+
+ /* Process the TLVs in the body */
+ if (length < bodylen)
+ goto invalid;
+ ret = babel_print_v2_tlvs(ndo, cp, bodylen, length);
+ if (ret == -1)
+ goto trunc;
+ if (ret == -2)
+ goto invalid;
+ length -= bodylen;
+ cp += bodylen;
+
+ /* If there's a trailer, process the TLVs in the trailer */
+ if (length != 0) {
+ if(ndo->ndo_vflag) ND_PRINT("\n\t----");
+ else ND_PRINT(" |");
+ ret = babel_print_v2_tlvs(ndo, cp, length, length);
+ if (ret == -1)
+ goto trunc;
+ if (ret == -2)
+ goto invalid;
+ }
return;
trunc:
invalid:
nd_print_invalid(ndo);
- return;
}
projects / tcpdump / blobdiff