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/object.h>
23 static int obj_cb(
const struct nlmsghdr *nlh,
void *data)
27 uint32_t *type = data;
29 t = nftnl_obj_alloc();
35 if (nftnl_obj_nlmsg_parse(nlh, t) < 0) {
36 perror(
"nftnl_obj_nlmsg_parse");
40 nftnl_obj_snprintf(buf,
sizeof(buf), t, *type, 0);
49 int main(
int argc,
char *argv[])
51 struct mnl_socket *nl;
52 char buf[MNL_SOCKET_BUFFER_SIZE];
54 uint32_t portid, seq, family;
55 struct nftnl_obj *t = NULL;
57 uint32_t type = NFTNL_OUTPUT_DEFAULT;
59 if (argc < 2 || argc > 5) {
60 fprintf(stderr,
"%s <family> <table> [<obj>] [<default|xml|json>]\n",
65 if (strcmp(argv[1],
"ip") == 0)
66 family = NFPROTO_IPV4;
67 else if (strcmp(argv[1],
"ip6") == 0)
68 family = NFPROTO_IPV6;
69 else if (strcmp(argv[1],
"bridge") == 0)
70 family = NFPROTO_BRIDGE;
71 else if (strcmp(argv[1],
"arp") == 0)
73 else if (strcmp(argv[1],
"unspec") == 0)
74 family = NFPROTO_UNSPEC;
76 fprintf(stderr,
"Unknown family: ip, ip6, bridge, arp, unspec\n");
80 if (strcmp(argv[argc-1],
"xml") == 0) {
81 type = NFTNL_OUTPUT_XML;
84 }
else if (strcmp(argv[argc-1],
"json") == 0) {
85 type = NFTNL_OUTPUT_JSON;
88 }
else if (strcmp(argv[argc - 1],
"default") == 0) {
92 if (argc == 3 || argc == 4) {
93 t = nftnl_obj_alloc();
102 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family,
105 nftnl_obj_set(t, NFTNL_OBJ_TABLE, argv[2]);
106 nftnl_obj_nlmsg_build_payload(nlh, t);
110 nftnl_obj_set(t, NFTNL_OBJ_TABLE, argv[2]);
111 nftnl_obj_set(t, NFTNL_OBJ_NAME, argv[3]);
112 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_COUNTER);
114 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family,
116 nftnl_obj_nlmsg_build_payload(nlh, t);
120 nl = mnl_socket_open(NETLINK_NETFILTER);
122 perror(
"mnl_socket_open");
126 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
127 perror(
"mnl_socket_bind");
130 portid = mnl_socket_get_portid(nl);
132 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
133 perror(
"mnl_socket_send");
137 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
139 ret = mnl_cb_run(buf, ret, seq, portid, obj_cb, &type);
142 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
148 mnl_socket_close(nl);