15#include <netinet/in.h>
17#include <linux/netfilter.h>
18#include <linux/netfilter/nf_tables.h>
20#include <libmnl/libmnl.h>
21#include <libnftnl/chain.h>
23static int table_cb(
const struct nlmsghdr *nlh,
void *data)
27 uint32_t *type = data;
29 t = nftnl_chain_alloc();
35 if (nftnl_chain_nlmsg_parse(nlh, t) < 0) {
36 perror(
"nftnl_chain_nlmsg_parse");
40 nftnl_chain_snprintf(buf,
sizeof(buf), t, *type, 0);
49int main(
int argc,
char *argv[])
51 struct mnl_socket *nl;
52 char buf[MNL_SOCKET_BUFFER_SIZE];
54 uint32_t portid, seq, type = NFTNL_OUTPUT_DEFAULT;
60 if (argc < 2 || argc > 5) {
61 fprintf(stderr,
"Usage: %s <family> [<table> <chain>]\n",
66 if (strcmp(argv[1],
"ip") == 0)
67 family = NFPROTO_IPV4;
68 else if (strcmp(argv[1],
"ip6") == 0)
69 family = NFPROTO_IPV6;
70 else if (strcmp(argv[1],
"inet") == 0)
71 family = NFPROTO_INET;
72 else if (strcmp(argv[1],
"bridge") == 0)
73 family = NFPROTO_BRIDGE;
74 else if (strcmp(argv[1],
"arp") == 0)
76 else if (strcmp(argv[1],
"unspec") == 0)
77 family = NFPROTO_UNSPEC;
79 fprintf(stderr,
"Unknown family: ip, ip6, inet, bridge, arp, unspec\n");
84 t = nftnl_chain_alloc();
89 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETCHAIN, family,
91 nftnl_chain_set_str(t, NFTNL_CHAIN_TABLE, argv[2]);
92 nftnl_chain_set_str(t, NFTNL_CHAIN_NAME, argv[3]);
93 nftnl_chain_nlmsg_build_payload(nlh, t);
95 }
else if (argc >= 2) {
96 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETCHAIN, family,
100 nl = mnl_socket_open(NETLINK_NETFILTER);
102 perror(
"mnl_socket_open");
106 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
107 perror(
"mnl_socket_bind");
110 portid = mnl_socket_get_portid(nl);
112 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
113 perror(
"mnl_socket_send");
117 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
119 ret = mnl_cb_run(buf, ret, seq, portid, table_cb, &type);
122 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
128 mnl_socket_close(nl);