diff options
Diffstat (limited to 'examples/nft-ct-timeout-add.c')
| -rw-r--r-- | examples/nft-ct-timeout-add.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/examples/nft-ct-timeout-add.c b/examples/nft-ct-timeout-add.c new file mode 100644 index 0000000..4c2052e --- /dev/null +++ b/examples/nft-ct-timeout-add.c @@ -0,0 +1,153 @@ +/* + * (C) 2012-2016 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 <netinet/in.h> + +#include <linux/netfilter.h> +#include <linux/netfilter/nf_tables.h> + +#include <obj.h> +#include <libmnl/libmnl.h> +#include <libnftnl/object.h> + +static struct nftnl_obj *obj_add_parse(int argc, char *argv[]) +{ + size_t timeout_array_size; + struct nftnl_obj *t; + uint32_t *timeout; + uint16_t family; + uint8_t l4proto; + + 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 { + fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n"); + return NULL; + } + + if (strcmp(argv[4], "udp") == 0) + l4proto = IPPROTO_UDP; + else if (strcmp(argv[4], "tcp") == 0) + l4proto = IPPROTO_TCP; + else { + fprintf(stderr, "Unknown layer 4 protocol\n"); + return NULL; + } + + t = nftnl_obj_alloc(); + if (t == NULL) { + perror("OOM"); + return NULL; + } + + timeout_array_size = sizeof(uint32_t) * (NFTNL_CTTIMEOUT_TCP_MAX); + timeout = calloc(1, timeout_array_size); + if (timeout == NULL) { + perror("OOM"); + return NULL; + } + + timeout[NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 111; + timeout[NFTNL_CTTIMEOUT_TCP_CLOSE] = 16; + timeout[NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 14; + nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family); + nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_TIMEOUT); + nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]); + nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]); + nftnl_obj_set_u8(t, NFTNL_OBJ_CT_TIMEOUT_L4PROTO, l4proto); + nftnl_obj_set_u16(t, NFTNL_OBJ_CT_TIMEOUT_L3PROTO, NFPROTO_IPV4); + nftnl_obj_set_data(t, NFTNL_OBJ_CT_TIMEOUT_ARRAY, + timeout, timeout_array_size); + return t; + +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t portid, seq, obj_seq, family; + struct nftnl_obj *t; + struct mnl_nlmsg_batch *batch; + int ret; + + if (argc != 5) { + fprintf(stderr, "%s <family> <table> <name> <protocol> \n", argv[0]); + exit(EXIT_FAILURE); + } + + t = obj_add_parse(argc, argv); + if (t == NULL) { + 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); + + obj_seq = seq; + family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY); + nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch), + NFT_MSG_NEWOBJ, family, NLM_F_ACK | NLM_F_CREATE, seq++); + nftnl_obj_nlmsg_build_payload(nlh, t); + nftnl_obj_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, obj_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; +} |