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#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <netinet/in.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <libmnl/libmnl.h>
#include <libnftnl/flowtable.h>
static int table_cb(const struct nlmsghdr *nlh, void *data)
{
struct nftnl_flowtable *t;
char buf[4096];
uint32_t *type = data;
t = nftnl_flowtable_alloc();
if (t == NULL) {
perror("OOM");
goto err;
}
if (nftnl_flowtable_nlmsg_parse(nlh, t) < 0) {
perror("nftnl_flowtable_nlmsg_parse");
goto err_free;
}
nftnl_flowtable_snprintf(buf, sizeof(buf), t, *type, 0);
printf("%s\n", buf);
err_free:
nftnl_flowtable_free(t);
err:
return MNL_CB_OK;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq, type = NFTNL_OUTPUT_DEFAULT;
struct nftnl_flowtable *t = NULL;
int ret, family;
seq = time(NULL);
if (argc < 2 || argc > 5) {
fprintf(stderr, "Usage: %s <family> [<table> <flowtable>]\n",
argv[0]);
exit(EXIT_FAILURE);
}
if (strcmp(argv[1], "ip") == 0)
family = NFPROTO_IPV4;
else if (strcmp(argv[1], "ip6") == 0)
family = NFPROTO_IPV6;
else if (strcmp(argv[1], "bridge") == 0)
family = NFPROTO_BRIDGE;
else if (strcmp(argv[1], "arp") == 0)
family = NFPROTO_ARP;
else if (strcmp(argv[1], "unspec") == 0)
family = NFPROTO_UNSPEC;
else {
fprintf(stderr, "Unknown family: ip, ip6, bridge, arp, unspec\n");
exit(EXIT_FAILURE);
}
if (argc >= 4) {
t = nftnl_flowtable_alloc();
if (t == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
nlh = nftnl_flowtable_nlmsg_build_hdr(buf, NFT_MSG_GETFLOWTABLE, family,
NLM_F_ACK, seq);
nftnl_flowtable_set(t, NFTNL_FLOWTABLE_TABLE, argv[2]);
nftnl_flowtable_set(t, NFTNL_FLOWTABLE_NAME, argv[3]);
nftnl_flowtable_nlmsg_build_payload(nlh, t);
nftnl_flowtable_free(t);
} else if (argc >= 2) {
nlh = nftnl_flowtable_nlmsg_build_hdr(buf, NFT_MSG_GETFLOWTABLE, family,
NLM_F_DUMP, seq);
}
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
portid = mnl_socket_get_portid(nl);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, portid, table_cb, &type);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return EXIT_SUCCESS;
}
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