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Diffstat (limited to 'examples/nft-set-add.c')
-rw-r--r-- | examples/nft-set-add.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/examples/nft-set-add.c b/examples/nft-set-add.c new file mode 100644 index 0000000..afc37c5 --- /dev/null +++ b/examples/nft-set-add.c @@ -0,0 +1,109 @@ +/* + * (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/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 = AF_INET; + else if (strcmp(argv[1], "ip6") == 0) + family = AF_INET6; + else if (strcmp(argv[1], "bridge") == 0) + family = AF_BRIDGE; + else { + fprintf(stderr, "Unknown family: ip, ip6, bridge\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; +} |