* SUCH DAMAGE.
*/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \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
+ */
-#include <tcpdump-stdinc.h>
+#include <config.h>
+
+#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
+#include "netdissect.h"
#include "addrtoname.h"
-#include "interface.h"
#include "extract.h"
-static void babel_print_v2(const u_char *cp, u_int length);
+static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length);
void
-babel_print(const u_char *cp, u_int length) {
- printf("babel");
+babel_print(netdissect_options *ndo,
+ const u_char *cp, u_int length)
+{
+ ndo->ndo_protocol = "babel";
+ nd_print_protocol(ndo);
- TCHECK2(*cp, 4);
+ ND_TCHECK_4(cp);
- if(cp[0] != 42) {
- printf(" malformed header");
+ if(GET_U_1(cp) != 42) {
+ ND_PRINT(" invalid header");
return;
} else {
- printf(" %d", cp[1]);
+ ND_PRINT(" %u", GET_U_1(cp + 1));
}
- switch(cp[1]) {
+ switch(GET_U_1(cp + 1)) {
case 2:
- babel_print_v2(cp,length);
+ babel_print_v2(ndo, cp, length);
break;
default:
- printf(" unknown version");
+ ND_PRINT(" unknown version");
break;
}
return;
trunc:
- printf(" [|babel]");
- return;
+ nd_print_trunc(ndo);
}
+/* TLVs */
#define MESSAGE_PAD1 0
#define MESSAGE_PADN 1
#define MESSAGE_ACK_REQ 2
#define MESSAGE_ROUTER_ID 6
#define MESSAGE_NH 7
#define MESSAGE_UPDATE 8
-#define MESSAGE_REQUEST 9
-#define MESSAGE_MH_REQUEST 10
+#define MESSAGE_ROUTE_REQUEST 9
+#define MESSAGE_SEQNO_REQUEST 10
#define MESSAGE_TSPC 11
#define MESSAGE_HMAC 12
+#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_PADN 1
+#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" },
+ { 255, "all" },
+ { 0, NULL }
+};
static const char *
-format_id(const u_char *id)
+format_id(netdissect_options *ndo, const u_char *id)
{
static char buf[25];
snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
- id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
+ GET_U_1(id), GET_U_1(id + 1), GET_U_1(id + 2),
+ GET_U_1(id + 3), GET_U_1(id + 4), GET_U_1(id + 5),
+ GET_U_1(id + 6), GET_U_1(id + 7));
buf[24] = '\0';
return buf;
}
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
static const char *
-format_prefix(const u_char *prefix, unsigned char plen)
+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(prefix + 12), plen - 96);
+ snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96);
else
-#ifdef INET6
- snprintf(buf, 50, "%s/%u", ip6addr_string(prefix), plen);
-#else
- snprintf(buf, 50, "IPv6 addresses not supported");
-#endif
+ snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen);
buf[49] = '\0';
return buf;
}
static const char *
-format_address(const u_char *prefix)
+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(prefix + 12);
+ return ipaddr_string(ndo, prefix + 12);
else
-#ifdef INET6
- return ip6addr_string(prefix);
-#else
- return "IPv6 addresses not supported";
-#endif
+ return ip6addr_string(ndo, prefix);
+}
+
+static const char *
+format_interval(const uint16_t i)
+{
+ static char buf[sizeof("000.00s")];
+
+ if (i == 0)
+ return "0.0s (bogus)";
+ snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100);
+ return buf;
+}
+
+static const char *
+format_interval_update(const uint16_t i)
+{
+ return i == 0xFFFF ? "infinity" : format_interval(i);
+}
+
+static const char *
+format_timestamp(const uint32_t i)
+{
+ static char buf[sizeof("0000.000000s")];
+ snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000);
+ return buf;
}
+/* Return number of octets consumed from the input buffer (not the prefix length
+ * in bytes), or -1 for encoding error. */
static int
network_prefix(int ae, int plen, unsigned int omitted,
const unsigned char *p, const unsigned char *dp,
{
unsigned pb;
unsigned char prefix[16];
+ int consumed = 0;
if(plen >= 0)
pb = (plen + 7) / 8;
if (dp == NULL) return -1;
memcpy(prefix, dp, 12 + omitted);
}
- if(pb > omitted) memcpy(prefix + 12 + omitted, p, pb - omitted);
+ if(pb > omitted) {
+ memcpy(prefix + 12 + omitted, p, pb - omitted);
+ consumed = pb - omitted;
+ }
break;
case 2:
if(omitted > 16 || (pb > omitted && len < pb - omitted))
if (dp == NULL) return -1;
memcpy(prefix, dp, omitted);
}
- if(pb > omitted) memcpy(prefix + omitted, p, pb - omitted);
+ if(pb > omitted) {
+ memcpy(prefix + omitted, p, pb - omitted);
+ consumed = pb - omitted;
+ }
break;
case 3:
if(pb > 8 && len < pb - 8) return -1;
prefix[0] = 0xfe;
prefix[1] = 0x80;
- if(pb > 8) memcpy(prefix + 8, p, pb - 8);
+ if(pb > 8) {
+ memcpy(prefix + 8, p, pb - 8);
+ consumed = pb - 8;
+ }
break;
default:
return -1;
}
memcpy(p_r, prefix, 16);
- return 1;
+ return consumed;
}
static int
return network_prefix(ae, -1, 0, a, NULL, len, a_r);
}
+/*
+ * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126),
+ * their encoding is similar to the encoding of TLVs, but the type namespace is
+ * different:
+ *
+ * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV.
+ * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV.
+ * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing
+ * data. Its body is a variable-length sequence of 8-bit unsigned integers,
+ * each representing per-hop number of interfering radio channel for the
+ * prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel
+ * 255 interferes with any other channel.
+ * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between
+ * neighbours. In the case of a Hello TLV, the body stores a 32-bits
+ * timestamp, while in the case of a IHU TLV, two 32-bits timestamps are
+ * stored.
+ *
+ * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is
+ * only valid for TLV type 8 (Update). Note that within an Update TLV a missing
+ * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body.
+ * The former would mean a lack of any claims about the interference, and the
+ * latter would state that interference is definitely absent.
+ * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact
+ * semantic of the sub-TLV is different in each case.
+ */
+static void
+subtlvs_print(netdissect_options *ndo,
+ const u_char *cp, const u_char *ep, const uint8_t tlv_type)
+{
+ uint8_t subtype, sublen;
+ const char *sep;
+ uint32_t t1, t2;
+
+ while (cp < ep) {
+ subtype = GET_U_1(cp);
+ cp++;
+ if(subtype == MESSAGE_SUB_PAD1) {
+ ND_PRINT(" sub-pad1");
+ continue;
+ }
+ if ((MANDATORY_MASK & subtype) != 0)
+ ND_PRINT(" (M)");
+ if(cp == ep)
+ goto invalid;
+ sublen = GET_U_1(cp);
+ cp++;
+ if(cp + sublen > ep)
+ goto invalid;
+
+ switch(subtype) {
+ case MESSAGE_SUB_PADN:
+ ND_PRINT(" sub-padn");
+ cp += sublen;
+ break;
+ case MESSAGE_SUB_DIVERSITY:
+ ND_PRINT(" sub-diversity");
+ if (sublen == 0) {
+ ND_PRINT(" empty");
+ break;
+ }
+ sep = " ";
+ while (sublen) {
+ ND_PRINT("%s%s", sep,
+ tok2str(diversity_str, "%u", GET_U_1(cp)));
+ cp++;
+ sep = "-";
+ sublen--;
+ }
+ if(tlv_type != MESSAGE_UPDATE &&
+ tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC)
+ ND_PRINT(" (bogus)");
+ break;
+ case MESSAGE_SUB_TIMESTAMP:
+ ND_PRINT(" sub-timestamp");
+ if(tlv_type == MESSAGE_HELLO) {
+ if(sublen < 4)
+ goto invalid;
+ t1 = GET_BE_U_4(cp);
+ ND_PRINT(" %s", format_timestamp(t1));
+ } else if(tlv_type == MESSAGE_IHU) {
+ if(sublen < 8)
+ goto invalid;
+ t1 = GET_BE_U_4(cp);
+ ND_PRINT(" %s", format_timestamp(t1));
+ t2 = GET_BE_U_4(cp + 4);
+ ND_PRINT("|%s", format_timestamp(t2));
+ } else
+ ND_PRINT(" (bogus)");
+ cp += sublen;
+ break;
+ default:
+ ND_PRINT(" sub-unknown-0x%02x", subtype);
+ cp += sublen;
+ } /* switch */
+ } /* while */
+ return;
+
+ invalid:
+ nd_print_invalid(ndo);
+}
+
#define ICHECK(i, l) \
- if ((i) + (l) > bodylen || (i) + (l) > length) goto corrupt;
+ if ((i) + (l) > tlvs_length || (i) + (l) > packet_length_remaining) \
+ goto invalid;
-static void
-babel_print_v2(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};
- TCHECK2(*cp, 4);
- if (length < 4)
- goto corrupt;
- bodylen = EXTRACT_16BITS(cp + 2);
- printf(" (%u)", bodylen);
-
- /* Process the TLVs in the body */
i = 0;
- while(i < bodylen) {
+ while(i < tlvs_length) {
const u_char *message;
- u_int type, len;
+ uint8_t type;
+ u_int len;
+
+ message = cp + i;
+
+ ICHECK(i, 1);
+ if((type = GET_U_1(message)) == MESSAGE_PAD1) {
+ ND_PRINT(ndo->ndo_vflag ? "\n\tPad 1" : " pad1");
+ i += 1;
+ continue;
+ }
- message = cp + 4 + i;
- TCHECK2(*message, 2);
ICHECK(i, 2);
- type = message[0];
- len = message[1];
+ ND_TCHECK_2(message);
+ len = GET_U_1(message + 1);
- TCHECK2(*message, 2 + len);
ICHECK(i, 2 + len);
+ ND_TCHECK_LEN(message, 2 + len);
switch(type) {
- case MESSAGE_PAD1: {
- if(!vflag)
- printf(" pad1");
- else
- printf("\n\tPad 1");
- }
- break;
-
case MESSAGE_PADN: {
- if(!vflag)
- printf(" padN");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" padN");
else
- printf("\n\tPad %d", len + 2);
+ ND_PRINT("\n\tPad %u", len + 2);
}
break;
case MESSAGE_ACK_REQ: {
u_short nonce, interval;
- if(!vflag)
- printf(" ack-req");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" ack-req");
else {
- printf("\n\tAcknowledgment Request ");
- if(len < 6) goto corrupt;
- nonce = EXTRACT_16BITS(message + 4);
- interval = EXTRACT_16BITS(message + 6);
- printf("%04x %d", nonce, interval);
+ ND_PRINT("\n\tAcknowledgment Request ");
+ if(len < 6) goto invalid;
+ nonce = GET_BE_U_2(message + 4);
+ interval = GET_BE_U_2(message + 6);
+ ND_PRINT("%04x %s", nonce, format_interval(interval));
}
}
break;
case MESSAGE_ACK: {
u_short nonce;
- if(!vflag)
- printf(" ack");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" ack");
else {
- printf("\n\tAcknowledgment ");
- if(len < 2) goto corrupt;
- nonce = EXTRACT_16BITS(message + 2);
- printf("%04x", nonce);
+ ND_PRINT("\n\tAcknowledgment ");
+ if(len < 2) goto invalid;
+ nonce = GET_BE_U_2(message + 2);
+ ND_PRINT("%04x", nonce);
}
}
break;
case MESSAGE_HELLO: {
- u_short seqno, interval;
- if(!vflag)
- printf(" hello");
+ u_short seqno, interval, unicast;
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" hello");
else {
- printf("\n\tHello ");
- if(len < 6) goto corrupt;
- seqno = EXTRACT_16BITS(message + 4);
- interval = EXTRACT_16BITS(message + 6);
- printf("seqno %u interval %u", seqno, interval);
+ 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);
+ 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_IHU: {
- unsigned short txcost, interval;
- if(!vflag)
- printf(" ihu");
+ unsigned short rxcost, interval;
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" ihu");
else {
u_char address[16];
+ u_char ae;
int rc;
- printf("\n\tIHU ");
- if(len < 6) goto corrupt;
- txcost = EXTRACT_16BITS(message + 4);
- interval = EXTRACT_16BITS(message + 6);
- rc = network_address(message[2], message + 8, len - 6, address);
- if(rc < 0) { printf("[|babel]"); break; }
- printf("%s txcost %u interval %d",
- format_address(address), txcost, interval);
+ ND_PRINT("\n\tIHU ");
+ if(len < 6) goto invalid;
+ rxcost = GET_BE_U_2(message + 4);
+ interval = GET_BE_U_2(message + 6);
+ ae = GET_U_1(message + 2);
+ rc = network_address(ae, message + 8,
+ len - 6, address);
+ if(rc < 0) { nd_print_trunc(ndo); break; }
+ ND_PRINT("%s rxcost %u interval %s",
+ ae == 0 ? "any" : format_address(ndo, address),
+ rxcost, format_interval(interval));
+ /* Extra data. */
+ if((u_int)rc < len - 6)
+ subtlvs_print(ndo, message + 8 + rc, message + 2 + len,
+ type);
}
}
break;
case MESSAGE_ROUTER_ID: {
- if(!vflag)
- printf(" router-id");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" router-id");
else {
- printf("\n\tRouter Id");
- if(len < 10) goto corrupt;
- printf(" %s", format_id(message + 4));
+ ND_PRINT("\n\tRouter Id");
+ if(len < 10) goto invalid;
+ ND_PRINT(" %s", format_id(ndo, message + 4));
}
}
break;
case MESSAGE_NH: {
- if(!vflag)
- printf(" nh");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" nh");
else {
int rc;
+ u_char ae;
u_char nh[16];
- printf("\n\tNext Hop");
- if(len < 2) goto corrupt;
- rc = network_address(message[2], message + 4, len - 2, nh);
- if(rc < 0) goto corrupt;
- printf(" %s", format_address(nh));
+ ND_PRINT("\n\tNext Hop");
+ if(len < 2) goto invalid;
+ ae = GET_U_1(message + 2);
+ rc = network_address(ae, message + 4,
+ len - 2, nh);
+ if(rc < 0) goto invalid;
+ ND_PRINT(" %s", ae == 0 ? "invalid AE 0" : format_address(ndo, nh));
}
}
break;
case MESSAGE_UPDATE: {
- if(!vflag) {
- printf(" update");
- if(len < 1)
- printf("/truncated");
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(" update");
+ if(len < 10)
+ goto invalid;
else
- printf("%s%s%s",
- (message[3] & 0x80) ? "/prefix": "",
- (message[3] & 0x40) ? "/id" : "",
- (message[3] & 0x3f) ? "/unknown" : "");
+ ND_PRINT("%s%s%s",
+ (GET_U_1(message + 3) & 0x80) ? "/prefix": "",
+ (GET_U_1(message + 3) & 0x40) ? "/id" : "",
+ (GET_U_1(message + 3) & 0x3f) ? "/unknown" : "");
} else {
u_short interval, seqno, metric;
- u_char plen;
+ u_char ae, plen;
int rc;
u_char prefix[16];
- printf("\n\tUpdate");
- if(len < 10) goto corrupt;
- plen = message[4] + (message[2] == 1 ? 96 : 0);
- rc = network_prefix(message[2], message[4], message[5],
+ ND_PRINT("\n\tUpdate");
+ if(len < 10) goto invalid;
+ ae = GET_U_1(message + 2);
+ plen = GET_U_1(message + 4) + (GET_U_1(message + 2) == 1 ? 96 : 0);
+ rc = network_prefix(ae,
+ GET_U_1(message + 4),
+ GET_U_1(message + 5),
message + 12,
- message[2] == 1 ? v4_prefix : v6_prefix,
+ GET_U_1(message + 2) == 1 ? v4_prefix : v6_prefix,
len - 10, prefix);
- if(rc < 0) goto corrupt;
- interval = EXTRACT_16BITS(message + 6);
- seqno = EXTRACT_16BITS(message + 8);
- metric = EXTRACT_16BITS(message + 10);
- printf("%s%s%s %s metric %u seqno %u interval %u",
- (message[3] & 0x80) ? "/prefix": "",
- (message[3] & 0x40) ? "/id" : "",
- (message[3] & 0x3f) ? "/unknown" : "",
- format_prefix(prefix, plen),
- metric, seqno, interval);
- if(message[3] & 0x80) {
- if(message[2] == 1)
+ if(rc < 0) goto invalid;
+ interval = GET_BE_U_2(message + 6);
+ seqno = GET_BE_U_2(message + 8);
+ metric = GET_BE_U_2(message + 10);
+ ND_PRINT("%s%s%s %s metric %u seqno %u interval %s",
+ (GET_U_1(message + 3) & 0x80) ? "/prefix": "",
+ (GET_U_1(message + 3) & 0x40) ? "/id" : "",
+ (GET_U_1(message + 3) & 0x3f) ? "/unknown" : "",
+ ae == 0 ? "any" : format_prefix(ndo, prefix, plen),
+ metric, seqno, format_interval_update(interval));
+ if(GET_U_1(message + 3) & 0x80) {
+ if(GET_U_1(message + 2) == 1)
memcpy(v4_prefix, prefix, 16);
else
memcpy(v6_prefix, prefix, 16);
}
+ /* extra data? */
+ if((u_int)rc < len - 10)
+ subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type);
}
}
break;
- case MESSAGE_REQUEST: {
- if(!vflag)
- printf(" request");
+ case MESSAGE_ROUTE_REQUEST: {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" route-request");
else {
int rc;
- u_char prefix[16], plen;
- printf("\n\tRequest ");
- if(len < 2) goto corrupt;
- plen = message[3] + (message[2] == 1 ? 96 : 0);
- rc = network_prefix(message[2], message[3], 0,
+ u_char prefix[16], ae, plen;
+ ND_PRINT("\n\tRoute Request ");
+ if(len < 2) goto invalid;
+ ae = GET_U_1(message + 2);
+ plen = GET_U_1(message + 3) + (GET_U_1(message + 2) == 1 ? 96 : 0);
+ rc = network_prefix(ae,
+ GET_U_1(message + 3), 0,
message + 4, NULL, len - 2, prefix);
- if(rc < 0) goto corrupt;
- plen = message[3] + (message[2] == 1 ? 96 : 0);
- printf("for %s",
- message[2] == 0 ? "any" : format_prefix(prefix, plen));
+ if(rc < 0) goto invalid;
+ ND_PRINT("for %s",
+ ae == 0 ? "any" : format_prefix(ndo, prefix, plen));
}
}
break;
- case MESSAGE_MH_REQUEST : {
- if(!vflag)
- printf(" mh-request");
+ case MESSAGE_SEQNO_REQUEST : {
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" seqno-request");
else {
int rc;
u_short seqno;
- u_char prefix[16], plen;
- printf("\n\tMH-Request ");
- if(len < 14) goto corrupt;
- seqno = EXTRACT_16BITS(message + 4);
- rc = network_prefix(message[2], message[3], 0,
+ u_char prefix[16], ae, plen;
+ ND_PRINT("\n\tSeqno Request ");
+ if(len < 14) goto invalid;
+ ae = GET_U_1(message + 2);
+ seqno = GET_BE_U_2(message + 4);
+ rc = network_prefix(ae,
+ GET_U_1(message + 3), 0,
message + 16, NULL, len - 14, prefix);
- if(rc < 0) goto corrupt;
- plen = message[3] + (message[2] == 1 ? 96 : 0);
- printf("(%u hops) for %s seqno %u id %s",
- message[6], format_prefix(prefix, plen),
- seqno, format_id(message + 8));
+ if(rc < 0) goto invalid;
+ plen = GET_U_1(message + 3) + (GET_U_1(message + 2) == 1 ? 96 : 0);
+ ND_PRINT("(%u hops) for %s seqno %u id %s",
+ GET_U_1(message + 6),
+ ae == 0 ? "invalid AE 0" : format_prefix(ndo, prefix, plen),
+ seqno, format_id(ndo, message + 8));
}
}
break;
case MESSAGE_TSPC :
- if(!vflag)
- printf(" tspc");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" tspc");
else {
- printf("\n\tTS/PC ");
- if(len < 6) goto corrupt;
- printf("timestamp %u packetcounter %u", EXTRACT_32BITS (message + 4),
- EXTRACT_16BITS(message + 2));
+ ND_PRINT("\n\tTS/PC ");
+ if(len < 6) goto invalid;
+ ND_PRINT("timestamp %u packetcounter %u",
+ GET_BE_U_4(message + 4),
+ GET_BE_U_2(message + 2));
}
break;
case MESSAGE_HMAC : {
- if(!vflag)
- printf(" hmac");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" hmac");
else {
unsigned j;
- printf("\n\tHMAC ");
- if(len < 18) goto corrupt;
- printf("key-id %u digest-%u ", EXTRACT_16BITS(message + 2), len - 2);
+ ND_PRINT("\n\tHMAC ");
+ if(len < 18) goto invalid;
+ ND_PRINT("key-id %u digest-%u ", GET_BE_U_2(message + 2),
+ len - 2);
for (j = 0; j < len - 2; j++)
- printf ("%02X", message[4 + j]);
+ ND_PRINT("%02X", GET_U_1(message + j + 4));
+ }
+ }
+ break;
+
+ case MESSAGE_UPDATE_SRC_SPECIFIC : {
+ if(!ndo->ndo_vflag) {
+ ND_PRINT(" ss-update");
+ } else {
+ u_char prefix[16], src_prefix[16];
+ u_short interval, seqno, metric;
+ u_char ae, plen, src_plen, omitted;
+ int rc;
+ int parsed_len = 10;
+ ND_PRINT("\n\tSS-Update");
+ if(len < 10) goto invalid;
+ ae = GET_U_1(message + 2);
+ src_plen = GET_U_1(message + 3);
+ plen = GET_U_1(message + 4);
+ omitted = GET_U_1(message + 5);
+ interval = GET_BE_U_2(message + 6);
+ seqno = GET_BE_U_2(message + 8);
+ metric = GET_BE_U_2(message + 10);
+ rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len,
+ ae == 1 ? v4_prefix : v6_prefix,
+ len - parsed_len, prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ plen += 96;
+ parsed_len += rc;
+ rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
+ NULL, len - parsed_len, src_prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ src_plen += 96;
+ parsed_len += rc;
+
+ ND_PRINT(" %s from", format_prefix(ndo, prefix, plen));
+ ND_PRINT(" %s metric %u seqno %u interval %s",
+ format_prefix(ndo, src_prefix, src_plen),
+ metric, seqno, format_interval_update(interval));
+ /* extra data? */
+ if((u_int)parsed_len < len)
+ subtlvs_print(ndo, message + 2 + parsed_len,
+ message + 2 + len, type);
+ }
+ }
+ break;
+
+ case MESSAGE_REQUEST_SRC_SPECIFIC : {
+ if(!ndo->ndo_vflag)
+ ND_PRINT(" ss-request");
+ else {
+ int rc, parsed_len = 3;
+ u_char ae, plen, src_plen, prefix[16], src_prefix[16];
+ ND_PRINT("\n\tSS-Request ");
+ if(len < 3) goto invalid;
+ ae = GET_U_1(message + 2);
+ plen = GET_U_1(message + 3);
+ src_plen = GET_U_1(message + 4);
+ rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
+ NULL, len - parsed_len, prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ plen += 96;
+ parsed_len += rc;
+ rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
+ NULL, len - parsed_len, src_prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ src_plen += 96;
+ parsed_len += rc;
+ if(ae == 0) {
+ ND_PRINT("for any");
+ } else {
+ ND_PRINT("for (%s, ", format_prefix(ndo, prefix, plen));
+ ND_PRINT("%s)", format_prefix(ndo, src_prefix, src_plen));
+ }
}
}
break;
+
+ case MESSAGE_MH_REQUEST_SRC_SPECIFIC : {
+ if(!ndo->ndo_vflag)
+ ND_PRINT(" ss-mh-request");
+ else {
+ int rc, parsed_len = 14;
+ u_short seqno;
+ u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc;
+ const u_char *router_id = NULL;
+ ND_PRINT("\n\tSS-MH-Request ");
+ if(len < 14) goto invalid;
+ ae = GET_U_1(message + 2);
+ plen = GET_U_1(message + 3);
+ seqno = GET_BE_U_2(message + 4);
+ hopc = GET_U_1(message + 6);
+ src_plen = GET_U_1(message + 7);
+ router_id = message + 8;
+ rc = network_prefix(ae, plen, 0, message + 2 + parsed_len,
+ NULL, len - parsed_len, prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ plen += 96;
+ parsed_len += rc;
+ rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len,
+ NULL, len - parsed_len, src_prefix);
+ if(rc < 0) goto invalid;
+ if(ae == 1)
+ src_plen += 96;
+ ND_PRINT("(%u hops) for (%s, ",
+ hopc, format_prefix(ndo, prefix, plen));
+ ND_PRINT("%s) seqno %u id %s",
+ format_prefix(ndo, src_prefix, src_plen),
+ seqno, format_id(ndo, router_id));
+ }
+ }
+ 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(!vflag)
- printf(" unknown");
+ if (!ndo->ndo_vflag)
+ ND_PRINT(" unknown");
else
- printf("\n\tUnknown message type %d", type);
+ ND_PRINT("\n\tUnknown message type %u", type);
}
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:
- printf(" [|babel]");
+ nd_print_trunc(ndo);
return;
- corrupt:
- printf(" (corrupt)");
- return;
+ invalid:
+ nd_print_invalid(ndo);
}
projects / tcpdump / blobdiff