13#include <netinet/in.h>
15#include <linux/netfilter.h>
16#include <linux/netfilter/nf_tables.h>
19#include <libmnl/libmnl.h>
20#include <libnftnl/object.h>
22static struct nftnl_obj *obj_add_parse(
int argc,
char *argv[])
24 size_t timeout_array_size;
30 if (strcmp(argv[1],
"ip") == 0)
31 family = NFPROTO_IPV4;
32 else if (strcmp(argv[1],
"ip6") == 0)
33 family = NFPROTO_IPV6;
34 else if (strcmp(argv[1],
"inet") == 0)
35 family = NFPROTO_INET;
36 else if (strcmp(argv[1],
"bridge") == 0)
37 family = NFPROTO_BRIDGE;
38 else if (strcmp(argv[1],
"arp") == 0)
41 fprintf(stderr,
"Unknown family: ip, ip6, inet, bridge, arp\n");
45 if (strcmp(argv[4],
"udp") == 0)
46 l4proto = IPPROTO_UDP;
47 else if (strcmp(argv[4],
"tcp") == 0)
48 l4proto = IPPROTO_TCP;
50 fprintf(stderr,
"Unknown layer 4 protocol\n");
54 t = nftnl_obj_alloc();
60 timeout_array_size =
sizeof(uint32_t) * (NFTNL_CTTIMEOUT_TCP_MAX);
61 timeout = calloc(1, timeout_array_size);
62 if (timeout == NULL) {
67 timeout[NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 111;
68 timeout[NFTNL_CTTIMEOUT_TCP_CLOSE] = 16;
69 timeout[NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 14;
70 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
71 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_TIMEOUT);
72 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
73 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
74 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_TIMEOUT_L4PROTO, l4proto);
75 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_TIMEOUT_L3PROTO, NFPROTO_IPV4);
76 nftnl_obj_set_data(t, NFTNL_OBJ_CT_TIMEOUT_ARRAY,
77 timeout, timeout_array_size);
82int main(
int argc,
char *argv[])
84 struct mnl_socket *nl;
85 char buf[MNL_SOCKET_BUFFER_SIZE];
87 uint32_t portid, seq, obj_seq, family;
89 struct mnl_nlmsg_batch *batch;
93 fprintf(stderr,
"%s <family> <table> <name> <protocol> \n", argv[0]);
97 t = obj_add_parse(argc, argv);
103 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
105 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
106 mnl_nlmsg_batch_next(batch);
109 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
110 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
111 NFT_MSG_NEWOBJ, family, NLM_F_ACK | NLM_F_CREATE, seq++);
112 nftnl_obj_nlmsg_build_payload(nlh, t);
114 mnl_nlmsg_batch_next(batch);
116 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
117 mnl_nlmsg_batch_next(batch);
119 nl = mnl_socket_open(NETLINK_NETFILTER);
121 perror(
"mnl_socket_open");
125 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
126 perror(
"mnl_socket_bind");
129 portid = mnl_socket_get_portid(nl);
131 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
132 mnl_nlmsg_batch_size(batch)) < 0) {
133 perror(
"mnl_socket_send");
137 mnl_nlmsg_batch_stop(batch);
139 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
141 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
144 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
150 mnl_socket_close(nl);