* DAMAGE.
*/
+/* \summary: DLT_NFLOG printer */
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
-#include <pcap.h>
+#include "netdissect-stdinc.h"
#include "netdissect.h"
-#include "interface.h"
+#include "extract.h"
+
+#ifdef DLT_NFLOG
/*
* Structure of an NFLOG header and TLV parts, as described at
- * http://www.tcpdump.org/linktypes/LINKTYPE_NFLOG.html
+ * https://www.tcpdump.org/linktypes/LINKTYPE_NFLOG.html
+ *
+ * The NFLOG header is big-endian.
+ *
+ * The TLV length and type are in host byte order. The value is either
+ * big-endian or is an array of bytes in some externally-specified byte
+ * order (text string, link-layer address, link-layer header, packet
+ * data, etc.).
*/
typedef struct nflog_hdr {
- u_int8_t nflog_family; /* adress family */
- u_int8_t nflog_version; /* version */
- u_int16_t nflog_rid; /* resource ID */
+ nd_uint8_t nflog_family; /* address family */
+ nd_uint8_t nflog_version; /* version */
+ nd_uint16_t nflog_rid; /* resource ID */
} nflog_hdr_t;
+#define NFLOG_HDR_LEN sizeof(nflog_hdr_t)
+
typedef struct nflog_tlv {
- u_int16_t tlv_length; /* tlv length */
- u_int16_t tlv_type; /* tlv type */
- void* tlv_value; /* tlv value */
+ nd_uint16_t tlv_length; /* tlv length */
+ nd_uint16_t tlv_type; /* tlv type */
+ /* value follows this */
} nflog_tlv_t;
-#ifdef DLT_NFLOG
+#define NFLOG_TLV_LEN sizeof(nflog_tlv_t)
+
+typedef struct nflog_packet_hdr {
+ nd_uint16_t hw_protocol; /* hw protocol */
+ nd_uint8_t hook; /* netfilter hook */
+ nd_byte pad[1]; /* padding to 32 bits */
+} nflog_packet_hdr_t;
-#define NFULA_PAYLOAD 9
+typedef struct nflog_hwaddr {
+ nd_uint16_t hw_addrlen; /* address length */
+ nd_byte pad[2]; /* padding to 32-bit boundary */
+ nd_byte hw_addr[8]; /* address, up to 8 bytes */
+} nflog_hwaddr_t;
+typedef struct nflog_timestamp {
+ nd_uint64_t sec;
+ nd_uint64_t usec;
+} nflog_timestamp_t;
+
+/*
+ * TLV types.
+ */
+#define NFULA_PACKET_HDR 1 /* nflog_packet_hdr_t */
+#define NFULA_MARK 2 /* packet mark from skbuff */
+#define NFULA_TIMESTAMP 3 /* nflog_timestamp_t for skbuff's time stamp */
+#define NFULA_IFINDEX_INDEV 4 /* ifindex of device on which packet received (possibly bridge group) */
+#define NFULA_IFINDEX_OUTDEV 5 /* ifindex of device on which packet transmitted (possibly bridge group) */
+#define NFULA_IFINDEX_PHYSINDEV 6 /* ifindex of physical device on which packet received (not bridge group) */
+#define NFULA_IFINDEX_PHYSOUTDEV 7 /* ifindex of physical device on which packet transmitted (not bridge group) */
+#define NFULA_HWADDR 8 /* nflog_hwaddr_t for hardware address */
+#define NFULA_PAYLOAD 9 /* packet payload */
+#define NFULA_PREFIX 10 /* text string - null-terminated, count includes NUL */
+#define NFULA_UID 11 /* UID owning socket on which packet was sent/received */
+#define NFULA_SEQ 12 /* sequence number of packets on this NFLOG socket */
+#define NFULA_SEQ_GLOBAL 13 /* sequence number of pakets on all NFLOG sockets */
+#define NFULA_GID 14 /* GID owning socket on which packet was sent/received */
+#define NFULA_HWTYPE 15 /* ARPHRD_ type of skbuff's device */
+#define NFULA_HWHEADER 16 /* skbuff's MAC-layer header */
+#define NFULA_HWLEN 17 /* length of skbuff's MAC-layer header */
+
+/*
+ * Define two constants specifically for the two AF code points from the
+ * LINKTYPE_NFLOG specification above and use these constants instead of
+ * AF_INET and AF_INET6. This is the only way to dissect the "wire" encoding
+ * correctly because some BSD systems define AF_INET6 differently from Linux
+ * (see af.h) and Haiku defines both AF_INET and AF_INET6 differently from
+ * Linux.
+ */
+#define NFLOG_AF_INET 2
+#define NFLOG_AF_INET6 10
static const struct tok nflog_values[] = {
- { AF_INET, "IPv4" },
- { AF_INET6, "IPv6" },
- { 0, NULL }
+ { NFLOG_AF_INET, "IPv4" },
+ { NFLOG_AF_INET6, "IPv6" },
+ { 0, NULL }
};
-static inline void
-nflog_hdr_print(struct netdissect_options *ndo, const nflog_hdr_t *hdr, u_int length)
+static void
+nflog_hdr_print(netdissect_options *ndo, const nflog_hdr_t *hdr, u_int length)
{
- ND_PRINT((ndo, "version %d, resource ID %d", hdr->nflog_version, ntohs(hdr->nflog_rid)));
+ ND_PRINT("version %u, resource ID %u",
+ GET_U_1(hdr->nflog_version), GET_BE_U_2(hdr->nflog_rid));
if (!ndo->ndo_qflag) {
- ND_PRINT((ndo,", family %s (%d)",
- tok2str(nflog_values, "Unknown",
- hdr->nflog_family),
- hdr->nflog_family));
+ ND_PRINT(", family %s (%u)",
+ tok2str(nflog_values, "Unknown",
+ GET_U_1(hdr->nflog_family)),
+ GET_U_1(hdr->nflog_family));
} else {
- ND_PRINT((ndo,", %s",
- tok2str(nflog_values,
- "Unknown NFLOG (0x%02x)",
- hdr->nflog_family)));
+ ND_PRINT(", %s",
+ tok2str(nflog_values,
+ "Unknown NFLOG (0x%02x)",
+ GET_U_1(hdr->nflog_family)));
}
- ND_PRINT((ndo, ", length %u: ", length));
+ ND_PRINT(", length %u: ", length);
}
-u_int
-nflog_if_print(struct netdissect_options *ndo,
- const struct pcap_pkthdr *h, const u_char *p)
+void
+nflog_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h, const u_char *p)
{
const nflog_hdr_t *hdr = (const nflog_hdr_t *)p;
- const nflog_tlv_t *tlv;
- u_int16_t size;
- u_int16_t h_size = sizeof(nflog_hdr_t);
+ uint16_t size;
+ uint16_t h_size = NFLOG_HDR_LEN;
u_int caplen = h->caplen;
u_int length = h->len;
- if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
- ND_PRINT((ndo, "[|nflog]"));
- return h_size;
+ ndo->ndo_protocol = "nflog";
+ if (caplen < NFLOG_HDR_LEN) {
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += caplen;
+ return;
}
+ ndo->ndo_ll_hdr_len += NFLOG_HDR_LEN;
- if (!(hdr->nflog_version) == 0) {
- ND_PRINT((ndo, "version %u (unknown)", hdr->nflog_version));
- return h_size;
+ ND_TCHECK_SIZE(hdr);
+ if (GET_U_1(hdr->nflog_version) != 0) {
+ ND_PRINT("version %u (unknown)", GET_U_1(hdr->nflog_version));
+ return;
}
if (ndo->ndo_eflag)
nflog_hdr_print(ndo, hdr, length);
- length -= sizeof(nflog_hdr_t);
- caplen -= sizeof(nflog_hdr_t);
- p += sizeof(nflog_hdr_t);
+ p += NFLOG_HDR_LEN;
+ length -= NFLOG_HDR_LEN;
+ caplen -= NFLOG_HDR_LEN;
- do {
- tlv = (const nflog_tlv_t *) p;
- size = tlv->tlv_length;
+ while (length > 0) {
+ const nflog_tlv_t *tlv;
+
+ /* We have some data. Do we have enough for the TLV header? */
+ if (caplen < NFLOG_TLV_LEN)
+ goto trunc; /* No. */
+ tlv = (const nflog_tlv_t *) p;
+ ND_TCHECK_SIZE(tlv);
+ size = GET_HE_U_2(tlv->tlv_length);
if (size % 4 != 0)
size += 4 - size % 4;
- h_size = h_size + size;
-
- /* wrong size of the packet */
- if (size > length || size == 0)
- return h_size;
+ /* Is the TLV's length less than the minimum? */
+ if (size < NFLOG_TLV_LEN)
+ goto trunc; /* Yes. Give up now. */
+
+ /* Do we have enough data for the full TLV? */
+ if (caplen < size)
+ goto trunc; /* No. */
+
+ if (GET_HE_U_2(tlv->tlv_type) == NFULA_PAYLOAD) {
+ /*
+ * This TLV's data is the packet payload.
+ * Skip past the TLV header, and break out
+ * of the loop so we print the packet data.
+ */
+ p += NFLOG_TLV_LEN;
+ h_size += NFLOG_TLV_LEN;
+ length -= NFLOG_TLV_LEN;
+ caplen -= NFLOG_TLV_LEN;
+ break;
+ }
p += size;
- length = length - size;
- caplen = caplen - size;
-
- } while (tlv->tlv_type != NFULA_PAYLOAD);
-
- /* dont skip payload just tlv length and type */
- p = p - size + 4;
- length += size - 4;
- caplen += size - 4;
- h_size -= length;
+ h_size += size;
+ length -= size;
+ caplen -= size;
+ }
- switch (hdr->nflog_family) {
+ switch (GET_U_1(hdr->nflog_family)) {
- case AF_INET:
- ip_print(ndo, p, length);
+ case NFLOG_AF_INET:
+ ip_print(ndo, p, length);
break;
-#ifdef INET6
- case AF_INET6:
+ case NFLOG_AF_INET6:
ip6_print(ndo, p, length);
break;
-#endif /*INET6*/
default:
if (!ndo->ndo_eflag)
nflog_hdr_print(ndo, hdr,
- length + sizeof(nflog_hdr_t));
+ length + NFLOG_HDR_LEN);
if (!ndo->ndo_suppress_default_print)
- ndo->ndo_default_print(ndo, p, caplen);
+ ND_DEFAULTPRINT(p, caplen);
break;
}
- return h_size;
+ ndo->ndo_ll_hdr_len += h_size - NFLOG_HDR_LEN;
+ return;
+trunc:
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += h_size - NFLOG_HDR_LEN;
}
#endif /* DLT_NFLOG */
projects / tcpdump / blobdiff