+/*
+ * Copyright (c) 2013, Petar Alilovic,
+ * Faculty of Electrical Engineering and Computing, University of Zagreb
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
-#include <stdio.h>
-#include <pcap.h>
-
-#include "netdissect.h"
#include "interface.h"
-#ifdef DLT_NFLOG
+#if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
+#include <pcap/nflog.h>
+
+static const struct tok nflog_values[] = {
+ { AF_INET, "IPv4" },
+#ifdef INET6
+ { AF_INET6, "IPv6" },
+#endif /*INET6*/
+ { 0, NULL }
+};
-static void
-nflog_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen _U_)
+static inline void
+nflog_hdr_print(netdissect_options *ndo, const nflog_hdr_t *hdr, u_int length)
{
- ip_print(ndo, p, length);
- return;
+ ND_PRINT((ndo, "version %d, resource ID %d", hdr->nflog_version, ntohs(hdr->nflog_rid)));
+
+ if (!ndo->ndo_qflag) {
+ ND_PRINT((ndo,", family %s (%d)",
+ tok2str(nflog_values, "Unknown",
+ hdr->nflog_family),
+ hdr->nflog_family));
+ } else {
+ ND_PRINT((ndo,", %s",
+ tok2str(nflog_values,
+ "Unknown NFLOG (0x%02x)",
+ hdr->nflog_family)));
+ }
+
+ ND_PRINT((ndo, ", length %u: ", length));
}
u_int
-nflog_if_print(struct netdissect_options *ndo,
- const struct pcap_pkthdr *h, const u_char *p)
+nflog_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h, const u_char *p)
{
- if (h->len < 104 || h->caplen < 104) {
- ND_PRINT((ndo, "[!nflog]"));
- return h->caplen;
+ const nflog_hdr_t *hdr = (const nflog_hdr_t *)p;
+ const nflog_tlv_t *tlv;
+ uint16_t size;
+ uint16_t h_size = sizeof(nflog_hdr_t);
+ 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;
+ }
+
+ if (!(hdr->nflog_version) == 0) {
+ ND_PRINT((ndo, "version %u (unknown)", hdr->nflog_version));
+ return h_size;
+ }
+
+ if (ndo->ndo_eflag)
+ nflog_hdr_print(ndo, hdr, length);
+
+ p += sizeof(nflog_hdr_t);
+ length -= sizeof(nflog_hdr_t);
+ caplen -= sizeof(nflog_hdr_t);
+
+ while (length > 0) {
+ /* We have some data. Do we have enough for the TLV header? */
+ if (caplen < sizeof(nflog_tlv_t) || length < sizeof(nflog_tlv_t)) {
+ /* No. */
+ ND_PRINT((ndo, "[|nflog]"));
+ return h_size;
+ }
+
+ tlv = (const nflog_tlv_t *) p;
+ size = tlv->tlv_length;
+ if (size % 4 != 0)
+ size += 4 - size % 4;
+
+ /* Is the TLV's length less than the minimum? */
+ if (size < sizeof(nflog_tlv_t)) {
+ /* Yes. Give up now. */
+ ND_PRINT((ndo, "[|nflog]"));
+ return h_size;
+ }
+
+ /* Do we have enough data for the full TLV? */
+ if (caplen < size || length < size) {
+ /* No. */
+ ND_PRINT((ndo, "[|nflog]"));
+ return h_size;
+ }
+
+ if (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 += sizeof(nflog_tlv_t);
+ h_size += sizeof(nflog_tlv_t);
+ length -= sizeof(nflog_tlv_t);
+ caplen -= sizeof(nflog_tlv_t);
+ break;
+ }
+
+ p += size;
+ h_size += size;
+ length -= size;
+ caplen -= size;
}
- nflog_print(ndo, p + 104, h->len - 104, h->caplen - 104);
+ switch (hdr->nflog_family) {
+
+ case AF_INET:
+ ip_print(ndo, p, length);
+ break;
+
+#ifdef AF_INET6
+ case AF_INET6:
+ ip6_print(ndo, p, length);
+ break;
+#endif /* AF_INET6 */
+
+ default:
+ if (!ndo->ndo_eflag)
+ nflog_hdr_print(ndo, hdr,
+ length + sizeof(nflog_hdr_t));
+
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ break;
+ }
- return 104;
+ return h_size;
}
-#endif /* DLT_NFLOG */
+#endif /* defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H) */
projects / tcpdump / blobdiff