4 #include <netinet/in.h>
6 #include <linux/netfilter.h>
7 #include <linux/netfilter/nf_tables.h>
9 #include <libmnl/libmnl.h>
10 #include <libnftnl/flowtable.h>
12 static struct nftnl_flowtable *flowtable_add_parse(
int argc,
char *argv[])
14 const char *dev_array[] = {
"eth0",
"tap0", NULL };
18 if (strcmp(argv[4],
"ingress") == 0)
19 hooknum = NF_NETDEV_INGRESS;
21 fprintf(stderr,
"Unknown hook: %s\n", argv[4]);
25 t = nftnl_flowtable_alloc();
30 nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_TABLE, argv[2]);
31 nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_NAME, argv[3]);
33 nftnl_flowtable_set_u32(t, NFTNL_FLOWTABLE_HOOKNUM, hooknum);
34 nftnl_flowtable_set_u32(t, NFTNL_FLOWTABLE_PRIO, atoi(argv[5]));
36 nftnl_flowtable_set_data(t, NFTNL_FLOWTABLE_DEVICES, dev_array, 0);
41 int main(
int argc,
char *argv[])
43 struct mnl_socket *nl;
44 char buf[MNL_SOCKET_BUFFER_SIZE];
46 uint32_t portid, seq, flowtable_seq;
49 struct mnl_nlmsg_batch *batch;
53 fprintf(stderr,
"Usage: %s <family> <table> <name> <hook> <prio>\n",
58 if (strcmp(argv[1],
"ip") == 0)
59 family = NFPROTO_IPV4;
60 else if (strcmp(argv[1],
"ip6") == 0)
61 family = NFPROTO_IPV6;
62 else if (strcmp(argv[1],
"bridge") == 0)
63 family = NFPROTO_BRIDGE;
64 else if (strcmp(argv[1],
"arp") == 0)
67 fprintf(stderr,
"Unknown family: ip, ip6, bridge, arp\n");
71 t = flowtable_add_parse(argc, argv);
75 batching = nftnl_batch_is_supported();
77 perror(
"cannot talk to nfnetlink");
82 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
85 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
86 mnl_nlmsg_batch_next(batch);
90 nlh = nftnl_flowtable_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
91 NFT_MSG_NEWFLOWTABLE, family,
92 NLM_F_CREATE|NLM_F_ACK, seq++);
93 nftnl_flowtable_nlmsg_build_payload(nlh, t);
94 nftnl_flowtable_free(t);
95 mnl_nlmsg_batch_next(batch);
98 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
99 mnl_nlmsg_batch_next(batch);
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");
112 portid = mnl_socket_get_portid(nl);
114 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
115 mnl_nlmsg_batch_size(batch)) < 0) {
116 perror(
"mnl_socket_send");
120 mnl_nlmsg_batch_stop(batch);
122 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
124 ret = mnl_cb_run(buf, ret, flowtable_seq, portid, NULL, NULL);
127 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
133 mnl_socket_close(nl);