11#include <netinet/in.h>
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
16#include <libmnl/libmnl.h>
17#include <libnftnl/chain.h>
19static struct nftnl_chain *chain_add_parse(
int argc,
char *argv[])
26 if (strcmp(argv[4],
"NF_INET_LOCAL_IN") == 0)
27 hooknum = NF_INET_LOCAL_IN;
28 else if (strcmp(argv[4],
"NF_INET_LOCAL_OUT") == 0)
29 hooknum = NF_INET_LOCAL_OUT;
30 else if (strcmp(argv[4],
"NF_INET_PRE_ROUTING") == 0)
31 hooknum = NF_INET_PRE_ROUTING;
32 else if (strcmp(argv[4],
"NF_INET_POST_ROUTING") == 0)
33 hooknum = NF_INET_POST_ROUTING;
34 else if (strcmp(argv[4],
"NF_INET_FORWARD") == 0)
35 hooknum = NF_INET_FORWARD;
37 fprintf(stderr,
"Unknown hook: %s\n", argv[4]);
42 t = nftnl_chain_alloc();
47 nftnl_chain_set_str(t, NFTNL_CHAIN_TABLE, argv[2]);
48 nftnl_chain_set_str(t, NFTNL_CHAIN_NAME, argv[3]);
50 nftnl_chain_set_u32(t, NFTNL_CHAIN_HOOKNUM, hooknum);
51 nftnl_chain_set_u32(t, NFTNL_CHAIN_PRIO, atoi(argv[5]));
57int main(
int argc,
char *argv[])
59 struct mnl_socket *nl;
60 char buf[MNL_SOCKET_BUFFER_SIZE];
62 uint32_t portid, seq, chain_seq;
65 struct mnl_nlmsg_batch *batch;
67 if (argc != 4 && argc != 6) {
68 fprintf(stderr,
"Usage: %s <family> <table> <chain> "
69 "[<hooknum> <prio>]\n",
74 if (strcmp(argv[1],
"ip") == 0)
75 family = NFPROTO_IPV4;
76 else if (strcmp(argv[1],
"ip6") == 0)
77 family = NFPROTO_IPV6;
78 else if (strcmp(argv[1],
"inet") == 0)
79 family = NFPROTO_INET;
80 else if (strcmp(argv[1],
"bridge") == 0)
81 family = NFPROTO_BRIDGE;
82 else if (strcmp(argv[1],
"arp") == 0)
85 fprintf(stderr,
"Unknown family: ip, ip6, inet, bridge, arp\n");
89 t = chain_add_parse(argc, argv);
94 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
96 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
97 mnl_nlmsg_batch_next(batch);
100 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
101 NFT_MSG_NEWCHAIN, family,
102 NLM_F_CREATE | NLM_F_ACK, seq++);
103 nftnl_chain_nlmsg_build_payload(nlh, t);
105 mnl_nlmsg_batch_next(batch);
107 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
108 mnl_nlmsg_batch_next(batch);
110 nl = mnl_socket_open(NETLINK_NETFILTER);
112 perror(
"mnl_socket_open");
116 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
117 perror(
"mnl_socket_bind");
120 portid = mnl_socket_get_portid(nl);
122 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
123 mnl_nlmsg_batch_size(batch)) < 0) {
124 perror(
"mnl_socket_send");
128 mnl_nlmsg_batch_stop(batch);
130 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
132 ret = mnl_cb_run(buf, ret, chain_seq, portid, NULL, NULL);
135 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
141 mnl_socket_close(nl);