15 #include <netinet/in.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nf_tables.h>
20 #include <libmnl/libmnl.h>
21 #include <libnftnl/chain.h>
23 int main(
int argc,
char *argv[])
25 struct mnl_socket *nl;
26 char buf[MNL_SOCKET_BUFFER_SIZE];
30 int ret, family, hooknum = 0;
32 if (argc != 4 && argc != 6) {
33 fprintf(stderr,
"Usage: %s <family> <table> <chain> "
34 "[<hooknum> <prio>]\n",
39 if (strcmp(argv[1],
"ip") == 0)
40 family = NFPROTO_IPV4;
41 else if (strcmp(argv[1],
"ip6") == 0)
42 family = NFPROTO_IPV6;
43 else if (strcmp(argv[1],
"bridge") == 0)
44 family = NFPROTO_BRIDGE;
45 else if (strcmp(argv[1],
"arp") == 0)
48 fprintf(stderr,
"Unknown family: ip, ip6, bridge, arp\n");
54 if (strcmp(argv[4],
"NF_INET_LOCAL_IN") == 0)
55 hooknum = NF_INET_LOCAL_IN;
56 else if (strcmp(argv[4],
"NF_INET_LOCAL_OUT") == 0)
57 hooknum = NF_INET_LOCAL_OUT;
58 else if (strcmp(argv[4],
"NF_INET_PRE_ROUTING") == 0)
59 hooknum = NF_INET_PRE_ROUTING;
60 else if (strcmp(argv[4],
"NF_INET_POST_ROUTING") == 0)
61 hooknum = NF_INET_POST_ROUTING;
62 else if (strcmp(argv[4],
"NF_INET_FORWARD") == 0)
63 hooknum = NF_INET_FORWARD;
65 fprintf(stderr,
"Unknown hook: %s\n", argv[4]);
70 t = nft_chain_alloc();
76 nlh = nft_chain_nlmsg_build_hdr(buf, NFT_MSG_NEWCHAIN, family,
77 NLM_F_EXCL|NLM_F_ACK, seq);
78 nft_chain_attr_set(t, NFT_CHAIN_ATTR_TABLE, argv[2]);
79 nft_chain_attr_set(t, NFT_CHAIN_ATTR_NAME, argv[3]);
81 nft_chain_attr_set_u32(t, NFT_CHAIN_ATTR_HOOKNUM, hooknum);
82 nft_chain_attr_set_u32(t, NFT_CHAIN_ATTR_PRIO, atoi(argv[5]));
84 nft_chain_nlmsg_build_payload(nlh, t);
87 nl = mnl_socket_open(NETLINK_NETFILTER);
89 perror(
"mnl_socket_open");
93 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
94 perror(
"mnl_socket_bind");
97 portid = mnl_socket_get_portid(nl);
99 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
100 perror(
"mnl_socket_send");
104 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
106 ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
109 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
115 mnl_socket_close(nl);