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Diffstat (limited to 'examples/nft-map-add.c')
| -rw-r--r-- | examples/nft-map-add.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/examples/nft-map-add.c b/examples/nft-map-add.c new file mode 100644 index 0000000..53244f5 --- /dev/null +++ b/examples/nft-map-add.c @@ -0,0 +1,157 @@ +/* + * (C) 2016 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. + */ + +#include <stdlib.h> +#include <time.h> +#include <string.h> +#include <stddef.h> /* for offsetof */ +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/tcp.h> +#include <arpa/inet.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <errno.h> + +#include <linux/netfilter.h> +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nf_tables.h> + +#include <libmnl/libmnl.h> +#include <libnftnl/set.h> + +static struct nftnl_set *setup_set(uint8_t family, const char *table, + const char *name) +{ + struct nftnl_set *s = NULL; + + s = nftnl_set_alloc(); + if (s == NULL) { + perror("OOM"); + exit(EXIT_FAILURE); + } + + nftnl_set_set_str(s, NFTNL_SET_TABLE, table); + nftnl_set_set_str(s, NFTNL_SET_NAME, name); + nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family); + nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, 2); + /* See nftables/include/datatype.h, where TYPE_INET_SERVICE is 13. We + * should place these datatypes in a public header so third party + * applications still work with nftables. + */ + nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13); + nftnl_set_set_u32(s, NFTNL_SET_DATA_LEN, 2); + nftnl_set_set_u32(s, NFTNL_SET_DATA_TYPE, 13); + nftnl_set_set_u32(s, NFTNL_SET_ID, 1); + nftnl_set_set_u32(s, NFTNL_SET_FLAGS, NFT_SET_CONSTANT | NFT_SET_MAP); + + return s; +} + +static void nftnl_mnl_batch_put(char *buf, uint16_t type, uint32_t seq) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfg; + + nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = type; + nlh->nlmsg_flags = NLM_F_REQUEST; + nlh->nlmsg_seq = seq; + + nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg)); + nfg->nfgen_family = AF_INET; + nfg->version = NFNETLINK_V0; + nfg->res_id = NFNL_SUBSYS_NFTABLES; +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + struct nftnl_set *s; + struct nlmsghdr *nlh; + struct mnl_nlmsg_batch *batch; + uint8_t family; + char buf[MNL_SOCKET_BUFFER_SIZE]; + uint32_t seq = time(NULL); + int ret; + + if (argc != 4) { + fprintf(stderr, "Usage: %s <family> <table> <setname>\n", argv[0]); + exit(EXIT_FAILURE); + } + + 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); + } + + s = setup_set(family, argv[2], argv[3]); + + 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); + } + + batch = mnl_nlmsg_batch_start(buf, sizeof(buf)); + + nftnl_mnl_batch_put(mnl_nlmsg_batch_current(batch), + NFNL_MSG_BATCH_BEGIN, seq++); + mnl_nlmsg_batch_next(batch); + + nlh = nftnl_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch), + NFT_MSG_NEWSET, family, + NLM_F_CREATE|NLM_F_ACK, seq++); + + nftnl_set_nlmsg_build_payload(nlh, s); + nftnl_set_free(s); + mnl_nlmsg_batch_next(batch); + + nftnl_mnl_batch_put(mnl_nlmsg_batch_current(batch), NFNL_MSG_BATCH_END, + seq++); + mnl_nlmsg_batch_next(batch); + + ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch), + mnl_nlmsg_batch_size(batch)); + if (ret == -1) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + mnl_nlmsg_batch_stop(batch); + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + if (ret == -1) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + + ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL); + if (ret < 0) { + perror("mnl_cb_run"); + exit(EXIT_FAILURE); + } + + mnl_socket_close(nl); + + return EXIT_SUCCESS; +} |