diff options
Diffstat (limited to 'examples/nft-set-add.c')
| -rw-r--r-- | examples/nft-set-add.c | 128 |
1 files changed, 84 insertions, 44 deletions
diff --git a/examples/nft-set-add.c b/examples/nft-set-add.c index 4e54c39..530aa0a 100644 --- a/examples/nft-set-add.c +++ b/examples/nft-set-add.c @@ -12,36 +12,75 @@ #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/table.h> #include <libnftnl/set.h> +static struct nft_set *setup_set(uint8_t family, const char *table, + const char *name) +{ + struct nft_set *s = NULL; + + s = nft_set_alloc(); + if (s == NULL) { + perror("OOM"); + exit(EXIT_FAILURE); + } + + nft_set_attr_set_str(s, NFT_SET_ATTR_TABLE, table); + nft_set_attr_set_str(s, NFT_SET_ATTR_NAME, name); + nft_set_attr_set_u32(s, NFT_SET_ATTR_FAMILY, family); + nft_set_attr_set_u32(s, NFT_SET_ATTR_KEY_LEN, 2); + nft_set_attr_set_u32(s, NFT_SET_ATTR_ID, 1); + nft_set_attr_set_u32(s, NFT_SET_ATTR_FLAGS, NFT_SET_CONSTANT); + + return s; +} + +static void nft_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; - char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nft_set *s; struct nlmsghdr *nlh; - uint32_t portid, seq, family; - struct nft_set *t = NULL; + 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, "%s <family> <table> <set>\n", argv[0]); + fprintf(stderr, "Usage: %s <family> <table> <setname>\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 = NFPROTO_IPV4; else if (strcmp(argv[1], "ip6") == 0) @@ -55,28 +94,7 @@ int main(int argc, char *argv[]) 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); + s = setup_set(family, argv[2], argv[3]); nl = mnl_socket_open(NETLINK_NETFILTER); if (nl == NULL) { @@ -88,24 +106,46 @@ int main(int argc, char *argv[]) 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"); + batch = mnl_nlmsg_batch_start(buf, sizeof(buf)); + + nft_mnl_batch_put(mnl_nlmsg_batch_current(batch), + NFNL_MSG_BATCH_BEGIN, seq++); + mnl_nlmsg_batch_next(batch); + + nlh = nft_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch), + NFT_MSG_NEWSET, family, + NLM_F_CREATE|NLM_F_ACK, seq++); + + nft_set_nlmsg_build_payload(nlh, s); + nft_set_free(s); + mnl_nlmsg_batch_next(batch); + + nft_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)); - 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"); + 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; |