* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-/* Cisco NetFlow protocol */
+/* \summary: Cisco NetFlow protocol printer */
-#define NETDISSECT_REWORKED
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/*
+ * Cisco NetFlow protocol
+ *
+ * See
+ *
+ * https://www.cisco.com/c/en/us/td/docs/net_mgmt/netflow_collection_engine/3-6/user/guide/format.html#wp1005892
+ */
-#include <tcpdump-stdinc.h>
+#include <config.h>
-#include <stdio.h>
-#include <string.h>
+#include "netdissect-stdinc.h"
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "tcp.h"
#include "ipproto.h"
-struct nfhdr {
- uint32_t ver_cnt; /* version [15], and # of records */
- uint32_t msys_uptime;
- uint32_t utc_sec;
- uint32_t utc_nsec;
- uint32_t sequence; /* v5 flow sequence number */
- uint32_t reserved; /* v5 only */
+struct nfhdr_v1 {
+ nd_uint16_t version; /* version number */
+ nd_uint16_t count; /* # of records */
+ nd_uint32_t msys_uptime;
+ nd_uint32_t utc_sec;
+ nd_uint32_t utc_nsec;
};
-struct nfrec {
- struct in_addr src_ina;
- struct in_addr dst_ina;
- struct in_addr nhop_ina;
- uint32_t ifaces; /* src,dst ifaces */
- uint32_t packets;
- uint32_t octets;
- uint32_t start_time; /* sys_uptime value */
- uint32_t last_time; /* sys_uptime value */
- uint32_t ports; /* src,dst ports */
- uint32_t proto_tos; /* proto, tos, pad, flags(v5) */
- uint32_t asses; /* v1: flags; v5: src,dst AS */
- uint32_t masks; /* src,dst addr prefix; v6: encaps */
- struct in_addr peer_nexthop; /* v6: IP address of the nexthop within the peer (FIB)*/
+struct nfrec_v1 {
+ nd_ipv4 src_ina;
+ nd_ipv4 dst_ina;
+ nd_ipv4 nhop_ina;
+ nd_uint16_t input; /* SNMP index of input interface */
+ nd_uint16_t output; /* SNMP index of output interface */
+ nd_uint32_t packets; /* packets in the flow */
+ nd_uint32_t octets; /* layer 3 octets in the packets of the flow */
+ nd_uint32_t start_time; /* sys_uptime value at start of flow */
+ nd_uint32_t last_time; /* sys_uptime value when last packet of flow was received */
+ nd_uint16_t srcport; /* TCP/UDP source port or equivalent */
+ nd_uint16_t dstport; /* TCP/UDP source port or equivalent */
+ nd_byte pad1[2]; /* pad */
+ nd_uint8_t proto; /* IP protocol type */
+ nd_uint8_t tos; /* IP type of service */
+ nd_uint8_t tcp_flags; /* cumulative OR of TCP flags */
+ nd_byte pad[3]; /* padding */
+ nd_uint32_t reserved; /* unused */
};
-void
-cnfp_print(netdissect_options *ndo, const u_char *cp)
+struct nfhdr_v5 {
+ nd_uint16_t version; /* version number */
+ nd_uint16_t count; /* # of records */
+ nd_uint32_t msys_uptime;
+ nd_uint32_t utc_sec;
+ nd_uint32_t utc_nsec;
+ nd_uint32_t sequence; /* flow sequence number */
+ nd_uint8_t engine_type; /* type of flow-switching engine */
+ nd_uint8_t engine_id; /* slot number of the flow-switching engine */
+ nd_uint16_t sampling_interval; /* sampling mode and interval */
+};
+
+struct nfrec_v5 {
+ nd_ipv4 src_ina;
+ nd_ipv4 dst_ina;
+ nd_ipv4 nhop_ina;
+ nd_uint16_t input; /* SNMP index of input interface */
+ nd_uint16_t output; /* SNMP index of output interface */
+ nd_uint32_t packets; /* packets in the flow */
+ nd_uint32_t octets; /* layer 3 octets in the packets of the flow */
+ nd_uint32_t start_time; /* sys_uptime value at start of flow */
+ nd_uint32_t last_time; /* sys_uptime value when last packet of flow was received */
+ nd_uint16_t srcport; /* TCP/UDP source port or equivalent */
+ nd_uint16_t dstport; /* TCP/UDP source port or equivalent */
+ nd_byte pad1; /* pad */
+ nd_uint8_t tcp_flags; /* cumulative OR of TCP flags */
+ nd_uint8_t proto; /* IP protocol type */
+ nd_uint8_t tos; /* IP type of service */
+ nd_uint16_t src_as; /* AS number of the source */
+ nd_uint16_t dst_as; /* AS number of the destination */
+ nd_uint8_t src_mask; /* source address mask bits */
+ nd_uint8_t dst_mask; /* destination address prefix mask bits */
+ nd_byte pad2[2];
+ nd_ipv4 peer_nexthop; /* v6: IP address of the nexthop within the peer (FIB)*/
+};
+
+struct nfhdr_v6 {
+ nd_uint16_t version; /* version number */
+ nd_uint16_t count; /* # of records */
+ nd_uint32_t msys_uptime;
+ nd_uint32_t utc_sec;
+ nd_uint32_t utc_nsec;
+ nd_uint32_t sequence; /* v5 flow sequence number */
+ nd_uint32_t reserved; /* v5 only */
+};
+
+struct nfrec_v6 {
+ nd_ipv4 src_ina;
+ nd_ipv4 dst_ina;
+ nd_ipv4 nhop_ina;
+ nd_uint16_t input; /* SNMP index of input interface */
+ nd_uint16_t output; /* SNMP index of output interface */
+ nd_uint32_t packets; /* packets in the flow */
+ nd_uint32_t octets; /* layer 3 octets in the packets of the flow */
+ nd_uint32_t start_time; /* sys_uptime value at start of flow */
+ nd_uint32_t last_time; /* sys_uptime value when last packet of flow was received */
+ nd_uint16_t srcport; /* TCP/UDP source port or equivalent */
+ nd_uint16_t dstport; /* TCP/UDP source port or equivalent */
+ nd_byte pad1; /* pad */
+ nd_uint8_t tcp_flags; /* cumulative OR of TCP flags */
+ nd_uint8_t proto; /* IP protocol type */
+ nd_uint8_t tos; /* IP type of service */
+ nd_uint16_t src_as; /* AS number of the source */
+ nd_uint16_t dst_as; /* AS number of the destination */
+ nd_uint8_t src_mask; /* source address mask bits */
+ nd_uint8_t dst_mask; /* destination address prefix mask bits */
+ nd_uint16_t flags;
+ nd_ipv4 peer_nexthop; /* v6: IP address of the nexthop within the peer (FIB)*/
+};
+
+static void
+cnfp_v1_print(netdissect_options *ndo, const u_char *cp)
{
- register const struct nfhdr *nh;
- register const struct nfrec *nr;
- struct protoent *pent;
- int nrecs, ver;
+ const struct nfhdr_v1 *nh;
+ const struct nfrec_v1 *nr;
+ const char *p_name;
+ uint8_t proto;
+ u_int nrecs, ver;
#if 0
time_t t;
#endif
- nh = (const struct nfhdr *)cp;
- ND_TCHECK(*nh);
+ nh = (const struct nfhdr_v1 *)cp;
- nrecs = EXTRACT_32BITS(&nh->ver_cnt) & 0xffff;
- ver = (EXTRACT_32BITS(&nh->ver_cnt) & 0xffff0000) >> 16;
+ ver = GET_BE_U_2(nh->version);
+ nrecs = GET_BE_U_4(nh->count);
#if 0
/*
* This is seconds since the UN*X epoch, and is followed by
* nanoseconds. XXX - format it, rather than just dumping the
* raw seconds-since-the-Epoch.
*/
- t = EXTRACT_32BITS(&nh->utc_sec);
+ t = GET_BE_U_4(nh->utc_sec);
#endif
- ND_PRINT((ndo, "NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
- EXTRACT_32BITS(&nh->msys_uptime)/1000,
- EXTRACT_32BITS(&nh->msys_uptime)%1000,
- EXTRACT_32BITS(&nh->utc_sec), EXTRACT_32BITS(&nh->utc_nsec)));
+ ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
+ GET_BE_U_4(nh->msys_uptime)/1000,
+ GET_BE_U_4(nh->msys_uptime)%1000,
+ GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
- if (ver == 5 || ver == 6) {
- ND_PRINT((ndo, "#%u, ", EXTRACT_32BITS(&nh->sequence)));
- nr = (const struct nfrec *)&nh[1];
- } else
- nr = (const struct nfrec *)&nh->sequence;
+ nr = (const struct nfrec_v1 *)&nh[1];
- ND_PRINT((ndo, "%2u recs", nrecs));
+ ND_PRINT("%2u recs", nrecs);
for (; nrecs != 0; nr++, nrecs--) {
- char buf[20];
- char asbuf[20];
-
- /*
- * Make sure we have the entire record.
- */
- if (ver == 5 || ver == 6) {
- ND_TCHECK(nr->masks);
- } else {
- ND_TCHECK(nr->proto_tos);
- }
- ND_PRINT((ndo, "\n started %u.%03u, last %u.%03u",
- EXTRACT_32BITS(&nr->start_time)/1000,
- EXTRACT_32BITS(&nr->start_time)%1000,
- EXTRACT_32BITS(&nr->last_time)/1000,
- EXTRACT_32BITS(&nr->last_time)%1000));
-
- asbuf[0] = buf[0] = '\0';
- if (ver == 5 || ver == 6) {
- snprintf(buf, sizeof(buf), "/%u",
- (EXTRACT_32BITS(&nr->masks) >> 24) & 0xff);
- snprintf(asbuf, sizeof(asbuf), ":%u",
- (EXTRACT_32BITS(&nr->asses) >> 16) & 0xffff);
- }
- ND_PRINT((ndo, "\n %s%s%s:%u ", intoa(nr->src_ina.s_addr), buf, asbuf,
- EXTRACT_32BITS(&nr->ports) >> 16));
-
- if (ver == 5 || ver ==6) {
- snprintf(buf, sizeof(buf), "/%d",
- (EXTRACT_32BITS(&nr->masks) >> 16) & 0xff);
- snprintf(asbuf, sizeof(asbuf), ":%u",
- EXTRACT_32BITS(&nr->asses) & 0xffff);
+ ND_PRINT("\n started %u.%03u, last %u.%03u",
+ GET_BE_U_4(nr->start_time)/1000,
+ GET_BE_U_4(nr->start_time)%1000,
+ GET_BE_U_4(nr->last_time)/1000,
+ GET_BE_U_4(nr->last_time)%1000);
+
+ ND_PRINT("\n %s:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
+ GET_BE_U_2(nr->srcport));
+
+ ND_PRINT("> %s:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
+ GET_BE_U_2(nr->dstport));
+
+ ND_PRINT(">> %s\n ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
+
+ proto = GET_U_1(nr->proto);
+ if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
+ ND_PRINT("%s ", p_name);
+ else
+ ND_PRINT("%u ", proto);
+
+ /* tcp flags for tcp only */
+ if (proto == IPPROTO_TCP) {
+ u_int flags;
+ flags = GET_U_1(nr->tcp_flags);
+ if (flags)
+ ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
}
- ND_PRINT((ndo, "> %s%s%s:%u ", intoa(nr->dst_ina.s_addr), buf, asbuf,
- EXTRACT_32BITS(&nr->ports) & 0xffff));
- ND_PRINT((ndo, ">> %s\n ", intoa(nr->nhop_ina.s_addr)));
+ ND_PRINT("tos %u, %u (%u octets)",
+ GET_U_1(nr->tos),
+ GET_BE_U_4(nr->packets),
+ GET_BE_U_4(nr->octets));
+ /* This was not all of struct nfrec_v1. */
+ ND_TCHECK_SIZE(nr);
+ }
+}
+
+static void
+cnfp_v5_print(netdissect_options *ndo, const u_char *cp)
+{
+ const struct nfhdr_v5 *nh;
+ const struct nfrec_v5 *nr;
+ const char *p_name;
+ uint8_t proto;
+ u_int nrecs, ver;
+#if 0
+ time_t t;
+#endif
+
+ nh = (const struct nfhdr_v5 *)cp;
+
+ ver = GET_BE_U_2(nh->version);
+ nrecs = GET_BE_U_4(nh->count);
+#if 0
+ /*
+ * This is seconds since the UN*X epoch, and is followed by
+ * nanoseconds. XXX - format it, rather than just dumping the
+ * raw seconds-since-the-Epoch.
+ */
+ t = GET_BE_U_4(nh->utc_sec);
+#endif
+
+ ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
+ GET_BE_U_4(nh->msys_uptime)/1000,
+ GET_BE_U_4(nh->msys_uptime)%1000,
+ GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
+
+ ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
+ /* This was not all of struct nfhdr_v5. */
+ ND_TCHECK_SIZE(nh);
+ nr = (const struct nfrec_v5 *)&nh[1];
+
+ ND_PRINT("%2u recs", nrecs);
+
+ for (; nrecs != 0; nr++, nrecs--) {
+ ND_PRINT("\n started %u.%03u, last %u.%03u",
+ GET_BE_U_4(nr->start_time)/1000,
+ GET_BE_U_4(nr->start_time)%1000,
+ GET_BE_U_4(nr->last_time)/1000,
+ GET_BE_U_4(nr->last_time)%1000);
- pent = getprotobynumber((EXTRACT_32BITS(&nr->proto_tos) >> 8) & 0xff);
- if (!pent || ndo->ndo_nflag)
- ND_PRINT((ndo, "%u ",
- (EXTRACT_32BITS(&nr->proto_tos) >> 8) & 0xff));
+ ND_PRINT("\n %s/%u:%u:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
+ GET_U_1(nr->src_mask), GET_BE_U_2(nr->src_as),
+ GET_BE_U_2(nr->srcport));
+
+ ND_PRINT("> %s/%u:%u:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
+ GET_U_1(nr->dst_mask), GET_BE_U_2(nr->dst_as),
+ GET_BE_U_2(nr->dstport));
+
+ ND_PRINT(">> %s\n ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
+
+ proto = GET_U_1(nr->proto);
+ if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
+ ND_PRINT("%s ", p_name);
else
- ND_PRINT((ndo, "%s ", pent->p_name));
+ ND_PRINT("%u ", proto);
/* tcp flags for tcp only */
- if (pent && pent->p_proto == IPPROTO_TCP) {
- int flags;
- if (ver == 1)
- flags = (EXTRACT_32BITS(&nr->asses) >> 24) & 0xff;
- else
- flags = (EXTRACT_32BITS(&nr->proto_tos) >> 16) & 0xff;
- ND_PRINT((ndo, "%s%s%s%s%s%s%s",
- flags & TH_FIN ? "F" : "",
- flags & TH_SYN ? "S" : "",
- flags & TH_RST ? "R" : "",
- flags & TH_PUSH ? "P" : "",
- flags & TH_ACK ? "A" : "",
- flags & TH_URG ? "U" : "",
- flags ? " " : ""));
+ if (proto == IPPROTO_TCP) {
+ u_int flags;
+ flags = GET_U_1(nr->tcp_flags);
+ if (flags)
+ ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
}
- buf[0]='\0';
- if (ver == 6) {
- snprintf(buf, sizeof(buf), "(%u<>%u encaps)",
- (EXTRACT_32BITS(&nr->masks) >> 8) & 0xff,
- (EXTRACT_32BITS(&nr->masks)) & 0xff);
+ ND_PRINT("tos %u, %u (%u octets)",
+ GET_U_1(nr->tos),
+ GET_BE_U_4(nr->packets),
+ GET_BE_U_4(nr->octets));
+ /* This was not all of struct nfrec_v5. */
+ ND_TCHECK_SIZE(nr);
+ }
+}
+
+static void
+cnfp_v6_print(netdissect_options *ndo, const u_char *cp)
+{
+ const struct nfhdr_v6 *nh;
+ const struct nfrec_v6 *nr;
+ const char *p_name;
+ uint8_t proto;
+ u_int nrecs, ver;
+#if 0
+ time_t t;
+#endif
+
+ nh = (const struct nfhdr_v6 *)cp;
+
+ ver = GET_BE_U_2(nh->version);
+ nrecs = GET_BE_U_4(nh->count);
+#if 0
+ /*
+ * This is seconds since the UN*X epoch, and is followed by
+ * nanoseconds. XXX - format it, rather than just dumping the
+ * raw seconds-since-the-Epoch.
+ */
+ t = GET_BE_U_4(nh->utc_sec);
+#endif
+
+ ND_PRINT("NetFlow v%x, %u.%03u uptime, %u.%09u, ", ver,
+ GET_BE_U_4(nh->msys_uptime)/1000,
+ GET_BE_U_4(nh->msys_uptime)%1000,
+ GET_BE_U_4(nh->utc_sec), GET_BE_U_4(nh->utc_nsec));
+
+ ND_PRINT("#%u, ", GET_BE_U_4(nh->sequence));
+ /* This was not all of struct nfhdr_v6. */
+ ND_TCHECK_SIZE(nh);
+ nr = (const struct nfrec_v6 *)&nh[1];
+
+ ND_PRINT("%2u recs", nrecs);
+
+ for (; nrecs != 0; nr++, nrecs--) {
+ ND_PRINT("\n started %u.%03u, last %u.%03u",
+ GET_BE_U_4(nr->start_time)/1000,
+ GET_BE_U_4(nr->start_time)%1000,
+ GET_BE_U_4(nr->last_time)/1000,
+ GET_BE_U_4(nr->last_time)%1000);
+
+ ND_PRINT("\n %s/%u:%u:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->src_ina)),
+ GET_U_1(nr->src_mask), GET_BE_U_2(nr->src_as),
+ GET_BE_U_2(nr->srcport));
+
+ ND_PRINT("> %s/%u:%u:%u ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->dst_ina)),
+ GET_U_1(nr->dst_mask), GET_BE_U_2(nr->dst_as),
+ GET_BE_U_2(nr->dstport));
+
+ ND_PRINT(">> %s\n ",
+ intoa(GET_IPV4_TO_NETWORK_ORDER(nr->nhop_ina)));
+
+ proto = GET_U_1(nr->proto);
+ if (!ndo->ndo_nflag && (p_name = netdb_protoname(proto)) != NULL)
+ ND_PRINT("%s ", p_name);
+ else
+ ND_PRINT("%u ", proto);
+
+ /* tcp flags for tcp only */
+ if (proto == IPPROTO_TCP) {
+ u_int flags;
+ flags = GET_U_1(nr->tcp_flags);
+ if (flags)
+ ND_PRINT("%s ", bittok2str_nosep(tcp_flag_values, "", flags));
}
- ND_PRINT((ndo, "tos %u, %u (%u octets) %s",
- EXTRACT_32BITS(&nr->proto_tos) & 0xff,
- EXTRACT_32BITS(&nr->packets),
- EXTRACT_32BITS(&nr->octets), buf));
+
+ ND_PRINT("tos %u, %u (%u octets) (%u<>%u encaps)",
+ GET_U_1(nr->tos),
+ GET_BE_U_4(nr->packets),
+ GET_BE_U_4(nr->octets),
+ (GET_BE_U_2(nr->flags) >> 8) & 0xff,
+ (GET_BE_U_2(nr->flags)) & 0xff);
+ /* This was not all of struct nfrec_v6. */
+ ND_TCHECK_SIZE(nr);
}
- return;
+}
-trunc:
- ND_PRINT((ndo, "[|cnfp]"));
- return;
+void
+cnfp_print(netdissect_options *ndo, const u_char *cp)
+{
+ int ver;
+
+ /*
+ * First 2 bytes are the version number.
+ */
+ ndo->ndo_protocol = "cnfp";
+ ver = GET_BE_U_2(cp);
+ switch (ver) {
+
+ case 1:
+ cnfp_v1_print(ndo, cp);
+ break;
+
+ case 5:
+ cnfp_v5_print(ndo, cp);
+ break;
+
+ case 6:
+ cnfp_v6_print(ndo, cp);
+ break;
+
+ default:
+ ND_PRINT("NetFlow v%x", ver);
+ break;
+ }
}
projects / tcpdump / blobdiff