16 #include <netinet/in.h>
17 #include <netinet/ip.h>
18 #include <netinet/tcp.h>
19 #include <arpa/inet.h>
20 #include <sys/types.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>
32 static 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);
47 static 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);
73 int 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;
93 fprintf(stderr,
"Unknown family: ip, ip6\n");
98 r = setup_rule(family, argv[2], argv[3], NULL, argv[4]);
100 r = setup_rule(family, argv[2], argv[3], argv[4], argv[5]);
102 nl = mnl_socket_open(NETLINK_NETFILTER);
104 perror(
"mnl_socket_open");
108 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
109 perror(
"mnl_socket_bind");
113 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
115 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
116 mnl_nlmsg_batch_next(batch);
118 nlh = nftnl_rule_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
120 nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY),
121 NLM_F_APPEND|NLM_F_CREATE|NLM_F_ACK, seq++);
123 nftnl_rule_nlmsg_build_payload(nlh, r);
125 mnl_nlmsg_batch_next(batch);
127 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
128 mnl_nlmsg_batch_next(batch);
130 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
131 mnl_nlmsg_batch_size(batch));
133 perror(
"mnl_socket_sendto");
137 mnl_nlmsg_batch_stop(batch);
139 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
141 perror(
"mnl_socket_recvfrom");
145 ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
147 perror(
"mnl_cb_run");
151 mnl_socket_close(nl);