summaryrefslogtreecommitdiffstats
path: root/l3extensions/libnetfilter_conntrack_ipv4.c
diff options
context:
space:
mode:
author/C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=pablo/emailAddress=pablo@netfilter.org </C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=pablo/emailAddress=pablo@netfilter.org>2005-12-26 02:29:02 +0000
committer/C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=pablo/emailAddress=pablo@netfilter.org </C=DE/ST=Berlin/L=Berlin/O=Netfilter Project/OU=Development/CN=pablo/emailAddress=pablo@netfilter.org>2005-12-26 02:29:02 +0000
commit8aa719eb1afb6c6e0a5bf74cbdab79dc82da6c80 (patch)
treed297a64f5ff25395981334035d5deae8d13e69cc /l3extensions/libnetfilter_conntrack_ipv4.c
parent5875e04f38e0e5c09e497dc735e287fc6cc626b3 (diff)
o add IPv6 support
o clean up layer-4 compare functions o finish the comparison infrastructure: support for tuple/mark matching o fix bug in the default event display when used in conjunction with the comparison infrastructure. o Bumped version to 0.0.30 Thanks to Yasuyuki Kozakai for: [LIBNETFILTER_CONNTRACK] fix dumping IPv6 connections that in included in this commit.
Diffstat (limited to 'l3extensions/libnetfilter_conntrack_ipv4.c')
-rw-r--r--l3extensions/libnetfilter_conntrack_ipv4.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/l3extensions/libnetfilter_conntrack_ipv4.c b/l3extensions/libnetfilter_conntrack_ipv4.c
new file mode 100644
index 0000000..727ea01
--- /dev/null
+++ b/l3extensions/libnetfilter_conntrack_ipv4.c
@@ -0,0 +1,94 @@
+/*
+ * (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 <arpa/inet.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_l3extensions.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_ipv4.h>
+
+static void parse_proto(struct nfattr *cda[], struct nfct_tuple *tuple)
+{
+ if (cda[CTA_IP_V4_SRC-1])
+ tuple->src.v4 = *(u_int32_t *)NFA_DATA(cda[CTA_IP_V4_SRC-1]);
+
+ if (cda[CTA_IP_V4_DST-1])
+ tuple->dst.v4 = *(u_int32_t *)NFA_DATA(cda[CTA_IP_V4_DST-1]);
+}
+
+static void build_tuple_proto(struct nfnlhdr *req, int size,
+ struct nfct_tuple *t)
+{
+ nfnl_addattr_l(&req->nlh, size, CTA_IP_V4_SRC, &t->src.v4,
+ sizeof(u_int32_t));
+ nfnl_addattr_l(&req->nlh, size, CTA_IP_V4_DST, &t->dst.v4,
+ sizeof(u_int32_t));
+}
+
+static int print_proto(char *buf, struct nfct_tuple *tuple)
+{
+ struct in_addr src = { .s_addr = tuple->src.v4 };
+ struct in_addr dst = { .s_addr = tuple->dst.v4 };
+ int size;
+
+ size = sprintf(buf, "src=%s ", inet_ntoa(src));
+ size += sprintf(buf+size, "dst=%s ", inet_ntoa(dst));
+
+ return size;
+}
+
+static int compare(struct nfct_conntrack *ct1,
+ struct nfct_conntrack *ct2,
+ unsigned int flags)
+{
+ if (flags & IPV4_ORIG)
+ if (ct1->tuple[NFCT_DIR_ORIGINAL].l3protonum !=
+ ct2->tuple[NFCT_DIR_ORIGINAL].l3protonum)
+ return 0;
+ if (flags & IPV4_REPL)
+ if (ct1->tuple[NFCT_DIR_REPLY].l3protonum !=
+ ct2->tuple[NFCT_DIR_REPLY].l3protonum)
+ return 0;
+ if (flags & IPV4_ORIG_SRC)
+ if (ct1->tuple[NFCT_DIR_ORIGINAL].src.v4 !=
+ ct2->tuple[NFCT_DIR_ORIGINAL].src.v4)
+ return 0;
+ if (flags & IPV4_ORIG_DST)
+ if (ct1->tuple[NFCT_DIR_ORIGINAL].dst.v4 !=
+ ct2->tuple[NFCT_DIR_ORIGINAL].dst.v4)
+ return 0;
+ if (flags & IPV4_REPL_SRC)
+ if (ct1->tuple[NFCT_DIR_REPLY].src.v4 !=
+ ct2->tuple[NFCT_DIR_REPLY].src.v4)
+ return 0;
+ if (flags & IPV4_REPL_DST)
+ if (ct1->tuple[NFCT_DIR_REPLY].dst.v4 !=
+ ct2->tuple[NFCT_DIR_REPLY].dst.v4)
+ return 0;
+
+ return 1;
+}
+
+static struct nfct_l3proto ipv4 = {
+ .name = "ipv4",
+ .protonum = AF_INET,
+ .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_l3proto(&ipv4);
+}