/usr/share/doc/libnftnl-dev/examples/nft-table-upd.c is in libnftnl-dev 1.0.5+snapshot20151106-1ubuntu3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /*
* (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 nft_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 = nft_table_alloc();
if (t == NULL) {
perror("OOM");
exit(EXIT_FAILURE);
}
batching = nft_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) {
nft_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);
}
nft_table_attr_set(t, NFT_TABLE_ATTR_NAME, argv[2]);
nft_table_attr_set_u32(t, NFT_TABLE_ATTR_FLAGS, flags);
table_seq = seq;
nlh = nft_table_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
NFT_MSG_NEWTABLE, family,
NLM_F_ACK, seq++);
nft_table_nlmsg_build_payload(nlh, t);
nft_table_free(t);
mnl_nlmsg_batch_next(batch);
if (batching) {
nft_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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