8 #include <netinet/in.h>
10 #include <linux/netfilter.h>
13 #include <libmnl/libmnl.h>
15 static uint16_t parse_family(
char *str,
const char *option)
17 if (strcmp(str,
"ip") == 0)
19 else if (strcmp(str,
"ip6") == 0)
21 else if (strcmp(str,
"inet") == 0)
23 else if (strcmp(str,
"arp") == 0)
25 fprintf(stderr,
"Unknown %s: ip, ip6, inet, arp\n", option);
29 static uint8_t parse_l4proto(
char *str)
31 if (strcmp(str,
"udp") == 0)
33 else if (strcmp(str,
"tcp") == 0)
36 fprintf(stderr,
"Unknown l4proto: tcp, udp\n");
42 static struct nftnl_obj *obj_parse(
int argc,
char *argv[])
44 uint16_t family, l3proto, dport;
45 uint8_t l4proto, size;
49 t = nftnl_obj_alloc();
55 family = parse_family(argv[1],
"family");
56 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
57 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
58 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
59 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
62 l3proto = parse_family(argv[8],
"l3proto");
63 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_L3PROTO, l3proto);
65 l4proto = parse_l4proto(argv[4]);
66 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_L4PROTO, l4proto);
67 dport = atoi(argv[5]);
68 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_DPORT, dport);
69 timeout = atol(argv[6]);
70 nftnl_obj_set_u32(t, NFTNL_OBJ_CT_EXPECT_TIMEOUT, timeout);
72 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_SIZE, size);
77 int main(
int argc,
char *argv[])
79 uint32_t portid, seq, obj_seq, family;
80 char buf[MNL_SOCKET_BUFFER_SIZE];
81 struct mnl_nlmsg_batch *batch;
82 struct mnl_socket *nl;
87 if (argc < 8 || argc > 9) {
88 fprintf(stderr,
"%s <family> <table> <name> <l4proto> <dport> <timeout> <size> [l3proto]\n", argv[0]);
92 t = obj_parse(argc, argv);
98 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
100 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
101 mnl_nlmsg_batch_next(batch);
104 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
105 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
106 NFT_MSG_NEWOBJ, family,
107 NLM_F_ACK | NLM_F_CREATE, seq++);
108 nftnl_obj_nlmsg_build_payload(nlh, t);
110 mnl_nlmsg_batch_next(batch);
112 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
113 mnl_nlmsg_batch_next(batch);
115 nl = mnl_socket_open(NETLINK_NETFILTER);
117 perror(
"mnl_socket_open");
121 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
122 perror(
"mnl_socket_bind");
125 portid = mnl_socket_get_portid(nl);
127 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
128 mnl_nlmsg_batch_size(batch)) < 0) {
129 perror(
"mnl_socket_send");
133 mnl_nlmsg_batch_stop(batch);
135 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
137 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
140 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
146 mnl_socket_close(nl);