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/*
* (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stddef.h> /* for offsetof */
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <libmnl/libmnl.h>
#include <libnftnl/set.h>
static struct nftnl_set *setup_set(uint8_t family, const char *table,
const char *name)
{
struct nftnl_set *s = NULL;
s = nftnl_set_alloc();
if (s == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
nftnl_set_set_str(s, NFTNL_SET_NAME, name);
nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family);
nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, 2);
/* See nftables/include/datatype.h, where TYPE_INET_SERVICE is 13. We
* should place these datatypes in a public header so third party
* applications still work with nftables.
*/
nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13);
nftnl_set_set_u32(s, NFTNL_SET_DATA_LEN, 2);
nftnl_set_set_u32(s, NFTNL_SET_DATA_TYPE, 13);
nftnl_set_set_u32(s, NFTNL_SET_ID, 1);
nftnl_set_set_u32(s, NFTNL_SET_FLAGS, NFT_SET_CONSTANT | NFT_SET_MAP);
return s;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
struct nftnl_set *s;
struct nlmsghdr *nlh;
struct mnl_nlmsg_batch *batch;
uint8_t family;
char buf[MNL_SOCKET_BUFFER_SIZE];
uint32_t seq = time(NULL);
int ret;
if (argc != 4) {
fprintf(stderr, "Usage: %s <family> <table> <setname>\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], "inet") == 0)
family = NFPROTO_INET;
else if (strcmp(argv[1], "bridge") == 0)
family = NFPROTO_BRIDGE;
else if (strcmp(argv[1], "arp") == 0)
family = NFPROTO_ARP;
else {
fprintf(stderr, "Unknown family: ip, ip6, bridge, arp\n");
exit(EXIT_FAILURE);
}
s = setup_set(family, argv[2], argv[3]);
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);
}
batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
nlh = nftnl_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
NFT_MSG_NEWSET, family,
NLM_F_CREATE|NLM_F_ACK, seq++);
nftnl_set_nlmsg_build_payload(nlh, s);
nftnl_set_free(s);
mnl_nlmsg_batch_next(batch);
nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
mnl_nlmsg_batch_size(batch));
if (ret == -1) {
perror("mnl_socket_sendto");
exit(EXIT_FAILURE);
}
mnl_nlmsg_batch_stop(batch);
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
if (ret == -1) {
perror("mnl_socket_recvfrom");
exit(EXIT_FAILURE);
}
ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
if (ret < 0) {
perror("mnl_cb_run");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return EXIT_SUCCESS;
}
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