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/*
* (C) 2012 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 <libnftnl/table.h>
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq, table_seq, family, flags;
struct nftnl_table *t = NULL;
struct mnl_nlmsg_batch *batch;
int ret, batching;
if (argc != 4) {
fprintf(stderr, "%s <family> <name> <state>\n", argv[0]);
exit(EXIT_FAILURE);
}
t = nftnl_table_alloc();
if (t == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
batching = nftnl_batch_is_supported();
if (batching < 0) {
perror("cannot talk to nfnetlink");
exit(EXIT_FAILURE);
}
seq = time(NULL);
batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
if (batching) {
nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
}
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], "netdev") == 0)
family = NFPROTO_NETDEV;
else {
fprintf(stderr,
"Unknown family: ip, ip6, bridge, arp, netdev\n");
exit(EXIT_FAILURE);
}
if (strcmp(argv[3], "active") == 0)
flags = 0;
else if (strcmp(argv[3], "dormant") == 0)
flags = NFT_TABLE_F_DORMANT;
else {
fprintf(stderr, "Unknown state: active, dormant\n");
exit(EXIT_FAILURE);
}
nftnl_table_set(t, NFTNL_TABLE_NAME, argv[2]);
nftnl_table_set_u32(t, NFTNL_TABLE_FLAGS, flags);
table_seq = seq;
nlh = nftnl_table_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
NFT_MSG_NEWTABLE, family,
NLM_F_ACK, seq++);
nftnl_table_nlmsg_build_payload(nlh, t);
nftnl_table_free(t);
mnl_nlmsg_batch_next(batch);
if (batching) {
nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
mnl_nlmsg_batch_next(batch);
}
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, mnl_nlmsg_batch_head(batch),
mnl_nlmsg_batch_size(batch)) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
mnl_nlmsg_batch_stop(batch);
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, table_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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