16#include <netinet/in.h>
17#include <netinet/ip.h>
18#include <netinet/tcp.h>
21#include <sys/socket.h>
24#include <linux/netfilter.h>
25#include <linux/netfilter/nfnetlink.h>
26#include <linux/netfilter/nf_tables.h>
28#include <libmnl/libmnl.h>
29#include <libnftnl/rule.h>
30#include <libnftnl/expr.h>
32static void add_ct_helper(
struct nftnl_rule *r,
const char *obj_name)
36 e = nftnl_expr_alloc(
"objref");
38 perror(
"expr objref oom");
41 nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
42 nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, 3);
44 nftnl_rule_add_expr(r, e);
47static struct nftnl_rule *setup_rule(uint8_t family,
const char *table,
48 const char *chain,
const char *handle,
const char *obj_name)
50 struct nftnl_rule *r = NULL;
53 r = nftnl_rule_alloc();
59 nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
60 nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
61 nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
64 handle_num = atoll(handle);
65 nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
68 add_ct_helper(r, obj_name);
73int main(
int argc,
char *argv[])
75 struct mnl_socket *nl;
78 struct mnl_nlmsg_batch *batch;
80 char buf[MNL_SOCKET_BUFFER_SIZE];
81 uint32_t seq = time(NULL);
84 if (argc < 5 || argc > 6) {
85 fprintf(stderr,
"Usage: %s <family> <table> <chain> <name>\n", argv[0]);
88 if (strcmp(argv[1],
"ip") == 0)
89 family = NFPROTO_IPV4;
90 else if (strcmp(argv[1],
"ip6") == 0)
91 family = NFPROTO_IPV6;
92 else if (strcmp(argv[1],
"inet") == 0)
93 family = NFPROTO_INET;
95 fprintf(stderr,
"Unknown family: ip, ip6, inet\n");
100 r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
102 r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
104 nl = mnl_socket_open(NETLINK_NETFILTER);
106 perror(
"mnl_socket_open");
110 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
111 perror(
"mnl_socket_bind");
115 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
117 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
118 mnl_nlmsg_batch_next(batch);
120 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
122 nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
123 NLM_F_APPEND | NLM_F_CREATE | NLM_F_ACK,
125 nftnl_rule_nlmsg_build_payload(nlh, r);
127 mnl_nlmsg_batch_next(batch);
129 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
130 mnl_nlmsg_batch_next(batch);
132 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
133 mnl_nlmsg_batch_size(batch));
135 perror(
"mnl_socket_sendto");
139 mnl_nlmsg_batch_stop(batch);
141 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
143 perror(
"mnl_socket_recvfrom");
147 ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
149 perror(
"mnl_cb_run");
153 mnl_socket_close(nl);