14#include <netinet/in.h>
15#include <netinet/ip.h>
16#include <netinet/tcp.h>
19#include <sys/socket.h>
22#include <linux/netfilter.h>
23#include <linux/netfilter/nfnetlink.h>
24#include <linux/netfilter/nf_tables.h>
26#include <libmnl/libmnl.h>
27#include <libnftnl/rule.h>
28#include <libnftnl/expr.h>
30static uint16_t parse_family(
char *str,
const char *option)
32 if (strcmp(str,
"ip") == 0)
34 else if (strcmp(str,
"ip6") == 0)
36 else if (strcmp(str,
"inet") == 0)
38 else if (strcmp(str,
"arp") == 0)
40 fprintf(stderr,
"Unknown %s: ip, ip6, inet, arp\n", option);
44static void add_ct_expect(
struct nftnl_rule *r,
const char *obj_name)
48 e = nftnl_expr_alloc(
"objref");
50 perror(
"expr objref oom");
53 nftnl_expr_set_str(e, NFTNL_EXPR_OBJREF_IMM_NAME, obj_name);
54 nftnl_expr_set_u32(e, NFTNL_EXPR_OBJREF_IMM_TYPE, NFT_OBJECT_CT_EXPECT);
56 nftnl_rule_add_expr(r, e);
59static struct nftnl_rule *setup_rule(uint8_t family,
const char *table,
60 const char *chain,
const char *handle,
63 struct nftnl_rule *r = NULL;
66 r = nftnl_rule_alloc();
72 nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
73 nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
74 nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, family);
77 handle_num = atoll(handle);
78 nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, handle_num);
81 add_ct_expect(r, obj_name);
86int main(
int argc,
char *argv[])
88 char buf[MNL_SOCKET_BUFFER_SIZE];
89 struct mnl_nlmsg_batch *batch;
90 uint32_t seq = time(NULL);
91 struct mnl_socket *nl;
97 if (argc < 5 || argc > 6) {
99 "Usage: %s <family> <table> <chain> [<handle>] <name>\n",
103 family = parse_family(argv[1],
"family");
106 r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
108 r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
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");
121 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
123 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
124 mnl_nlmsg_batch_next(batch);
126 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
128 nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
129 NLM_F_APPEND | NLM_F_CREATE | NLM_F_ACK,
131 nftnl_rule_nlmsg_build_payload(nlh, r);
133 mnl_nlmsg_batch_next(batch);
135 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
136 mnl_nlmsg_batch_next(batch);
138 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
139 mnl_nlmsg_batch_size(batch));
141 perror(
"mnl_socket_sendto");
145 mnl_nlmsg_batch_stop(batch);
147 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
149 perror(
"mnl_socket_recvfrom");
153 ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
155 perror(
"mnl_cb_run");
159 mnl_socket_close(nl);