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 static struct nftnl_chain *chain_add_parse(
int argc,
char *argv[])
30 if (strcmp(argv[4],
"NF_INET_LOCAL_IN") == 0)
31 hooknum = NF_INET_LOCAL_IN;
32 else if (strcmp(argv[4],
"NF_INET_LOCAL_OUT") == 0)
33 hooknum = NF_INET_LOCAL_OUT;
34 else if (strcmp(argv[4],
"NF_INET_PRE_ROUTING") == 0)
35 hooknum = NF_INET_PRE_ROUTING;
36 else if (strcmp(argv[4],
"NF_INET_POST_ROUTING") == 0)
37 hooknum = NF_INET_POST_ROUTING;
38 else if (strcmp(argv[4],
"NF_INET_FORWARD") == 0)
39 hooknum = NF_INET_FORWARD;
41 fprintf(stderr,
"Unknown hook: %s\n", argv[4]);
46 t = nftnl_chain_alloc();
51 nftnl_chain_set(t, NFTNL_CHAIN_TABLE, argv[2]);
52 nftnl_chain_set(t, NFTNL_CHAIN_NAME, argv[3]);
54 nftnl_chain_set_u32(t, NFTNL_CHAIN_HOOKNUM, hooknum);
55 nftnl_chain_set_u32(t, NFTNL_CHAIN_PRIO, atoi(argv[5]));
61 int main(
int argc,
char *argv[])
63 struct mnl_socket *nl;
64 char buf[MNL_SOCKET_BUFFER_SIZE];
66 uint32_t portid, seq, chain_seq;
69 struct mnl_nlmsg_batch *batch;
72 if (argc != 4 && argc != 6) {
73 fprintf(stderr,
"Usage: %s <family> <table> <chain> "
74 "[<hooknum> <prio>]\n",
79 if (strcmp(argv[1],
"ip") == 0)
80 family = NFPROTO_IPV4;
81 else if (strcmp(argv[1],
"ip6") == 0)
82 family = NFPROTO_IPV6;
83 else if (strcmp(argv[1],
"bridge") == 0)
84 family = NFPROTO_BRIDGE;
85 else if (strcmp(argv[1],
"arp") == 0)
88 fprintf(stderr,
"Unknown family: ip, ip6, bridge, arp\n");
92 t = chain_add_parse(argc, argv);
96 batching = nftnl_batch_is_supported();
98 perror(
"cannot talk to nfnetlink");
103 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
106 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
107 mnl_nlmsg_batch_next(batch);
111 nlh = nftnl_chain_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
112 NFT_MSG_NEWCHAIN, family,
113 NLM_F_CREATE|NLM_F_ACK, seq++);
114 nftnl_chain_nlmsg_build_payload(nlh, t);
116 mnl_nlmsg_batch_next(batch);
119 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
120 mnl_nlmsg_batch_next(batch);
123 nl = mnl_socket_open(NETLINK_NETFILTER);
125 perror(
"mnl_socket_open");
129 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
130 perror(
"mnl_socket_bind");
133 portid = mnl_socket_get_portid(nl);
135 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
136 mnl_nlmsg_batch_size(batch)) < 0) {
137 perror(
"mnl_socket_send");
141 mnl_nlmsg_batch_stop(batch);
143 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
145 ret = mnl_cb_run(buf, ret, chain_seq, portid, NULL, NULL);
148 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
154 mnl_socket_close(nl);