Usage:
./nft-rule-ct-helper-add ip filter input sip-5060
./nft-rule-get ip filter
ip filter input 7 6
[ objref type 3 name sip-5060 ]
nft list ruleset
...
chain input {
ct helper set "sip-5060"
}
Signed-off-by: Harsha Sharma <harshasharmaiitr@xxxxxxxxx>
---
examples/Makefile.am | 6 +-
examples/nft-rule-ct-helper-add.c | 154 ++++++++++++++++++++++++++++++++++++++
2 files changed, 159 insertions(+), 1 deletion(-)
create mode 100644 examples/nft-rule-ct-helper-add.c
diff --git a/examples/Makefile.am b/examples/Makefile.am
index e2c131a..d5584e5 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -36,7 +36,8 @@ check_PROGRAMS = nft-table-add \
nft-compat-get \
nft-ct-helper-add \
nft-ct-helper-get \
- nft-ct-helper-del
+ nft-ct-helper-del \
+ nft-rule-ct-helper-add
nft_table_add_SOURCES = nft-table-add.c
nft_table_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
@@ -148,3 +149,6 @@ nft_ct_helper_get_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
nft_ct_helper_del_SOURCES = nft-ct-helper-del.c
nft_ct_helper_del_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
+
+nft_rule_ct_helper_add_SOURCES = nft-rule-ct-helper-add.c
+nft_rule_ct_helper_add_LDADD = ../src/libnftnl.la ${LIBMNL_LIBS}
diff --git a/examples/nft-rule-ct-helper-add.c b/examples/nft-rule-ct-helper-add.c
new file mode 100644
index 0000000..1a4fefd
--- /dev/null
+++ b/examples/nft-rule-ct-helper-add.c
@@ -0,0 +1,154 @@
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stddef.h> /* for offsetof */
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+
+static void add_ct_helper(struct nftnl_rule *r, const char *obj_name)
+{
+ struct nftnl_expr *e;
+
+ e = nftnl_expr_alloc("objref");
+ if (e == NULL) {
+ perror("expr objref oom");
+ exit(EXIT_FAILURE);
+ }
+ nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
+ nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, 3);
+
+ nftnl_rule_add_expr(r, e);
+}
+
+static struct nftnl_rule *setup_rule(uint8_t family, const char *table,
+ const char *chain, const char *handle, const char *obj_name)
+{
+ struct nftnl_rule *r = NULL;
+ uint64_t handle_num;
+
+ r = nftnl_rule_alloc();
+ if (r == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ nftnl_rule_set(r, NFTNL_RULE_TABLE, table);
+ nftnl_rule_set(r, NFTNL_RULE_CHAIN, chain);
+ nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
+
+ if (handle != NULL) {
+ handle_num = atoll(handle);
+ nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
+ }
+
+ add_ct_helper(r, obj_name);
+
+ return r;
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ struct nftnl_rule *r;
+ struct nlmsghdr *nlh;
+ struct mnl_nlmsg_batch *batch;
+ uint8_t family;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ uint32_t seq = time(NULL);
+ int ret;
+
+ if (argc < 5 || argc > 6) {
+ fprintf(stderr, "Usage: %s <family> <table> <chain> <name>\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ if (strcmp(argv[1], "ip") == 0)
+ family = NFPROTO_IPV4;
+ else if (strcmp(argv[1], "ip6") == 0)
+ family = NFPROTO_IPV6;
+ else {
+ fprintf(stderr, "Unknown family: ip, ip6\n");
+ exit(EXIT_FAILURE);
+ }
+
+ if (argc != 6)
+ r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
+ else
+ r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+ nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ nlh = nftnl_rule_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_NEWRULE,
+ nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
+ NLM_F_APPEND|NLM_F_CREATE|NLM_F_ACK, seq++);
+
+ nftnl_rule_nlmsg_build_payload(nlh, r);
+ nftnl_rule_free(r);
+ mnl_nlmsg_batch_next(batch);
+
+ nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+ mnl_nlmsg_batch_next(batch);
+
+ ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch));
+ if (ret == -1) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_nlmsg_batch_stop(batch);
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ if (ret == -1) {
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
+ if (ret < 0) {
+ perror("mnl_cb_run");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return EXIT_SUCCESS;
+}
--
2.14.1
--
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