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Diffstat (limited to 'examples/nft-table-upd.c')
-rw-r--r-- | examples/nft-table-upd.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/examples/nft-table-upd.c b/examples/nft-table-upd.c new file mode 100644 index 0000000..7346636 --- /dev/null +++ b/examples/nft-table-upd.c @@ -0,0 +1,124 @@ +/* + * (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; + + 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); + } + + seq = time(NULL); + batch = mnl_nlmsg_batch_start(buf, sizeof(buf)); + + 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], "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 if (strcmp(argv[1], "netdev") == 0) + family = NFPROTO_NETDEV; + else { + fprintf(stderr, + "Unknown family: ip, ip6, inet, 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_str(t, NFTNL_TABLE_NAME, argv[2]); + nftnl_table_set_u32(t, NFTNL_TABLE_FLAGS, flags); + + table_seq = seq; + nlh = nftnl_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); + + 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; +} |