12#include <netinet/in.h>
13#include <netinet/ip.h>
14#include <netinet/tcp.h>
17#include <sys/socket.h>
20#include <linux/netfilter.h>
21#include <linux/netfilter/nfnetlink.h>
22#include <linux/netfilter/nf_tables.h>
24#include <libmnl/libmnl.h>
25#include <libnftnl/rule.h>
26#include <libnftnl/expr.h>
28static void add_ct_timeout(
struct nftnl_rule *r,
const char *obj_name)
32 e = nftnl_expr_alloc(
"objref");
34 perror(
"expr objref oom");
37 nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
38 nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, NFT_OBJECT_CT_TIMEOUT);
40 nftnl_rule_add_expr(r, e);
43static struct nftnl_rule *setup_rule(uint8_t family,
const char *table,
44 const char *chain,
const char *handle,
const char *obj_name)
46 struct nftnl_rule *r = NULL;
49 r = nftnl_rule_alloc();
55 nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
56 nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
57 nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
60 handle_num = atoll(handle);
61 nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
64 add_ct_timeout(r, obj_name);
69int main(
int argc,
char *argv[])
71 struct mnl_socket *nl;
74 struct mnl_nlmsg_batch *batch;
76 char buf[MNL_SOCKET_BUFFER_SIZE];
77 uint32_t seq = time(NULL);
80 if (argc < 5 || argc > 6) {
81 fprintf(stderr,
"Usage: %s <family> <table> <chain> <name>\n", argv[0]);
84 if (strcmp(argv[1],
"ip") == 0)
85 family = NFPROTO_IPV4;
86 else if (strcmp(argv[1],
"ip6") == 0)
87 family = NFPROTO_IPV6;
88 else if (strcmp(argv[1],
"inet") == 0)
89 family = NFPROTO_INET;
91 fprintf(stderr,
"Unknown family: ip, ip6, inet\n");
96 r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
98 r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
100 nl = mnl_socket_open(NETLINK_NETFILTER);
102 perror(
"mnl_socket_open");
106 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
107 perror(
"mnl_socket_bind");
111 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
113 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
114 mnl_nlmsg_batch_next(batch);
116 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
118 nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
119 NLM_F_APPEND | NLM_F_CREATE | NLM_F_ACK,
121 nftnl_rule_nlmsg_build_payload(nlh, r);
123 mnl_nlmsg_batch_next(batch);
125 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
126 mnl_nlmsg_batch_next(batch);
128 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
129 mnl_nlmsg_batch_size(batch));
131 perror(
"mnl_socket_sendto");
135 mnl_nlmsg_batch_stop(batch);
137 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
139 perror(
"mnl_socket_recvfrom");
143 ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
145 perror(
"mnl_cb_run");
149 mnl_socket_close(nl);