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Diffstat (limited to 'src/deprecated/extensions/libnetfilter_conntrack_icmp.c')
-rw-r--r--src/deprecated/extensions/libnetfilter_conntrack_icmp.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/deprecated/extensions/libnetfilter_conntrack_icmp.c b/src/deprecated/extensions/libnetfilter_conntrack_icmp.c
new file mode 100644
index 0000000..72a7eb0
--- /dev/null
+++ b/src/deprecated/extensions/libnetfilter_conntrack_icmp.c
@@ -0,0 +1,90 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h> /* For htons */
+#include <libnetfilter_conntrack/linux_nfnetlink_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_extensions.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_icmp.h>
+
+static void parse_proto(struct nfattr *cda[], struct nfct_tuple *tuple)
+{
+ if (cda[CTA_PROTO_ICMP_TYPE-1])
+ tuple->l4dst.icmp.type =
+ *(u_int8_t *)NFA_DATA(cda[CTA_PROTO_ICMP_TYPE-1]);
+
+ if (cda[CTA_PROTO_ICMP_CODE-1])
+ tuple->l4dst.icmp.code =
+ *(u_int8_t *)NFA_DATA(cda[CTA_PROTO_ICMP_CODE-1]);
+
+ if (cda[CTA_PROTO_ICMP_ID-1])
+ tuple->l4src.icmp.id =
+ *(u_int16_t *)NFA_DATA(cda[CTA_PROTO_ICMP_ID-1]);
+}
+
+static void build_tuple_proto(struct nfnlhdr *req, int size,
+ struct nfct_tuple *t)
+{
+ nfnl_addattr_l(&req->nlh, size, CTA_PROTO_ICMP_CODE,
+ &t->l4dst.icmp.code, sizeof(u_int8_t));
+ nfnl_addattr_l(&req->nlh, size, CTA_PROTO_ICMP_TYPE,
+ &t->l4dst.icmp.type, sizeof(u_int8_t));
+ nfnl_addattr_l(&req->nlh, size, CTA_PROTO_ICMP_ID,
+ &t->l4src.icmp.id, sizeof(u_int16_t));
+}
+
+static int print_proto(char *buf, struct nfct_tuple *t)
+{
+ /* The ID only makes sense some ICMP messages but we want to
+ * display the same output that /proc/net/ip_conntrack does */
+ return (sprintf(buf, "type=%d code=%d id=%d ",t->l4dst.icmp.type,
+ t->l4dst.icmp.code,
+ ntohs(t->l4src.icmp.id)));
+}
+
+static int compare(struct nfct_conntrack *ct1,
+ struct nfct_conntrack *ct2,
+ unsigned int flags)
+{
+ if (flags & ICMP_TYPE)
+ if (ct1->tuple[NFCT_DIR_ORIGINAL].l4dst.icmp.type !=
+ ct2->tuple[NFCT_DIR_ORIGINAL].l4dst.icmp.type)
+ return 0;
+ if (flags & ICMP_CODE)
+ if (ct1->tuple[NFCT_DIR_ORIGINAL].l4dst.icmp.code !=
+ ct2->tuple[NFCT_DIR_ORIGINAL].l4dst.icmp.code)
+ return 0;
+ if (flags & ICMP_ID)
+ if (ct1->tuple[NFCT_DIR_REPLY].l4src.icmp.id !=
+ ct2->tuple[NFCT_DIR_REPLY].l4src.icmp.id)
+ return 0;
+
+ return 1;
+}
+
+static struct nfct_proto icmp = {
+ .name = "icmp",
+ .protonum = IPPROTO_ICMP,
+ .parse_proto = parse_proto,
+ .build_tuple_proto = build_tuple_proto,
+ .print_proto = print_proto,
+ .compare = compare,
+ .version = VERSION
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+ nfct_register_proto(&icmp);
+}