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/*
* (C) 2013 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.
*
* This software has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#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 <libnftables/table.h>
#include <libnftables/set.h>
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq, family;
struct nft_set *t = NULL;
int ret;
if (argc != 4) {
fprintf(stderr, "%s <family> <table> <set>\n", argv[0]);
exit(EXIT_FAILURE);
}
t = nft_set_alloc();
if (t == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
seq = time(NULL);
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 {
fprintf(stderr, "Unknown family: ip, ip6, bridge, arp\n");
exit(EXIT_FAILURE);
}
nft_set_attr_set(t, NFT_SET_ATTR_TABLE, argv[2]);
nft_set_attr_set(t, NFT_SET_ATTR_NAME, argv[3]);
/* destroy set when the rule is destroyed, elements canno change */
nft_set_attr_set_u32(t, NFT_SET_ATTR_FLAGS, NFT_SET_ANONYMOUS |
NFT_SET_CONSTANT);
/* This key is only used by user-space to interpret key type */
nft_set_attr_set_u32(t, NFT_SET_ATTR_KEY_TYPE, 0);
/* key is 4 bytes long */
nft_set_attr_set_u32(t, NFT_SET_ATTR_KEY_LEN, 4);
/*
* data type and data length only useful for mapping (1:1):
* matching -> action.
*
* This data is only used by user-space to interpret data type.
*/
// nft_set_attr_set_u32(t, NFT_SET_ATTR_DATA_TYPE, NFT_DATA_VERDICT);
// nft_set_attr_set_u32(t, NFT_SET_ATTR_DATA_LEN, 4);
nlh = nft_set_nlmsg_build_hdr(buf, NFT_MSG_NEWSET, family,
NLM_F_CREATE|NLM_F_EXCL|NLM_F_ACK, seq);
nft_set_nlmsg_build_payload(nlh, t);
nft_set_free(t);
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, NULL, NULL);
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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