12#include <netinet/in.h>
14#include <linux/netfilter.h>
17#include <libmnl/libmnl.h>
19static uint16_t parse_family(
char *str,
const char *option)
21 if (strcmp(str,
"ip") == 0)
23 else if (strcmp(str,
"ip6") == 0)
25 else if (strcmp(str,
"inet") == 0)
27 else if (strcmp(str,
"arp") == 0)
29 fprintf(stderr,
"Unknown %s: ip, ip6, inet, arp\n", option);
33static uint8_t parse_l4proto(
char *str)
35 if (strcmp(str,
"udp") == 0)
37 else if (strcmp(str,
"tcp") == 0)
40 fprintf(stderr,
"Unknown l4proto: tcp, udp\n");
46static struct nftnl_obj *obj_parse(
int argc,
char *argv[])
48 uint16_t family, l3proto, dport;
49 uint8_t l4proto, size;
53 t = nftnl_obj_alloc();
59 family = parse_family(argv[1],
"family");
60 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
61 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_EXPECT);
62 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
63 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
66 l3proto = parse_family(argv[8],
"l3proto");
67 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_L3PROTO, l3proto);
69 l4proto = parse_l4proto(argv[4]);
70 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_L4PROTO, l4proto);
71 dport = atoi(argv[5]);
72 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_EXPECT_DPORT, dport);
73 timeout = atol(argv[6]);
74 nftnl_obj_set_u32(t, NFTNL_OBJ_CT_EXPECT_TIMEOUT, timeout);
76 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_EXPECT_SIZE, size);
81int main(
int argc,
char *argv[])
83 uint32_t portid, seq, obj_seq, family;
84 char buf[MNL_SOCKET_BUFFER_SIZE];
85 struct mnl_nlmsg_batch *batch;
86 struct mnl_socket *nl;
91 if (argc < 8 || argc > 9) {
92 fprintf(stderr,
"%s <family> <table> <name> <l4proto> <dport> <timeout> <size> [l3proto]\n", argv[0]);
96 t = obj_parse(argc, argv);
102 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
104 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
105 mnl_nlmsg_batch_next(batch);
108 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
109 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
110 NFT_MSG_NEWOBJ, family,
111 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);