--- /dev/null
+/*
+ * 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.
+ */
+
+/*
+ * Structure of an NFLOG header and TLV parts, as described at
+ * http://www.tcpdump.org/linktypes/LINKTYPE_NFLOG.html
+ */
+typedef struct nflog_hdr {
+ u_int8_t nflog_family; /* adress family */
+ u_int8_t nflog_version; /* version */
+ u_int16_t nflog_rid; /* resource ID */
+} 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 */
+} nflog_tlv_t;
+/*
+ * 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 "netdissect.h"
#include "interface.h"
+#ifdef HAVE_LINUX_NETFILTER_NFNETLINK_LOG_H
+#include <linux/netfilter/nfnetlink_log.h>
+#include "nflog.h"
+
#ifdef DLT_NFLOG
+const struct tok nflog_values[] = {
+ { AF_INET, "IPv4" },
+ { AF_INET6, "IPv6" },
+ { 0, NULL }
+};
+
+static inline void
+nflog_hdr_print(struct netdissect_options *ndo, const u_char *bp, u_int length)
+{
+ const nflog_hdr_t *hdr;
+ hdr = (const nflog_hdr_t *)bp;
+
+ 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));
+}
+
static void
-nflog_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen _U_)
+nflog_print(struct netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
{
- ip_print(ndo, p, length);
- return;
+ const nflog_hdr_t *hdr;
+ const nflog_tlv_t *tlv;
+ u_int16_t size;
+
+ if (caplen < (int) sizeof(nflog_hdr_t)) {
+ ND_PRINT((ndo, "[|nflog]"));
+ return;
+ }
+
+ if (ndo->ndo_eflag)
+ nflog_hdr_print(ndo, p, length);
+
+ length -= sizeof(nflog_hdr_t);
+ caplen -= sizeof(nflog_hdr_t);
+ hdr = (const nflog_hdr_t *)p;
+ p += sizeof(nflog_hdr_t);
+
+ do {
+ tlv = (const nflog_tlv_t *) p;
+ size = tlv->tlv_length;
+
+ /* wrong size of the packet */
+ if (size > length )
+ return;
+
+ /* wrong tlv type */
+ if (tlv->tlv_type > NFULA_MAX)
+ return;
+
+ if (size % 4 != 0)
+ size += 4 - size % 4;
+
+ 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;
+
+ switch (hdr->nflog_family) {
+
+ case AF_INET:
+ ip_print(ndo, p, length);
+ break;
+
+#ifdef INET6
+ case AF_INET6:
+ ip6_print(ndo, p, length);
+ break;
+#endif /*INET6*/
+
+ default:
+ if (!ndo->ndo_eflag)
+ nflog_hdr_print(ndo, (u_char *)hdr,
+ length + sizeof(nflog_hdr_t));
+
+ if (!ndo->ndo_suppress_default_print)
+ ndo->ndo_default_print(ndo, p, caplen);
+ break;
+ }
}
u_int
nflog_if_print(struct netdissect_options *ndo,
- const struct pcap_pkthdr *h, const u_char *p)
+ const struct pcap_pkthdr *h, const u_char *p)
{
- if (h->len < 104 || h->caplen < 104) {
- ND_PRINT((ndo, "[!nflog]"));
- return h->caplen;
- }
-
- nflog_print(ndo, p + 104, h->len - 104, h->caplen - 104);
- return 104;
+ nflog_print(ndo, p, h->len, h->caplen);
+ return (sizeof(nflog_hdr_t));
}
+#endif /* HAVE_LINUX_NETFILTER_NFNETLINK_LOG_H */
#endif /* DLT_NFLOG */
projects / tcpdump / commitdiff
