13#include <netinet/in.h>
15#include <linux/netfilter.h>
16#include <linux/netfilter/nf_tables.h>
18#include <libmnl/libmnl.h>
19#include <libnftnl/object.h>
21static uint16_t parse_family(
char *str,
const char *option)
23 if (strcmp(str,
"ip") == 0)
25 else if (strcmp(str,
"ip6") == 0)
27 else if (strcmp(str,
"inet") == 0)
30 fprintf(stderr,
"Unknown %s: ip, ip6, inet\n", option);
35static uint8_t parse_l4proto(
char *str)
37 if (strcmp(str,
"udp") == 0)
39 else if (strcmp(str,
"tcp") == 0)
42 fprintf(stderr,
"Unknown l4proto: tcp, udp\n");
48static struct nftnl_obj *ct_helper_add_parse(
int argc,
char *argv[])
51 uint16_t family, l3proto;
54 t = nftnl_obj_alloc();
60 family = parse_family(argv[1],
"family");
61 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
62 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_HELPER);
63 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
64 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
66 nftnl_obj_set_str(t, NFTNL_OBJ_CT_HELPER_NAME, argv[4]);
67 l4proto = parse_l4proto(argv[5]);
68 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_HELPER_L4PROTO, l4proto);
70 l3proto = parse_family(argv[6],
"l3proto");
71 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_HELPER_L3PROTO, l3proto);
77int main(
int argc,
char *argv[])
80 uint32_t seq, obj_seq, family, portid;
81 struct mnl_nlmsg_batch *batch;
82 char buf[MNL_SOCKET_BUFFER_SIZE];
84 struct mnl_socket *nl;
88 fprintf(stderr,
"%s <family> <table> <name> <type> <l4proto> [l3proto]\n", argv[0]);
92 t = ct_helper_add_parse(argc, argv);
97 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
99 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
100 mnl_nlmsg_batch_next(batch);
103 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
104 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
105 NFT_MSG_NEWOBJ, family, NLM_F_CREATE | NLM_F_ACK, seq++);
107 nftnl_obj_nlmsg_build_payload(nlh, t);
109 mnl_nlmsg_batch_next(batch);
111 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
112 mnl_nlmsg_batch_next(batch);
114 nl = mnl_socket_open(NETLINK_NETFILTER);
116 perror(
"mnl_socket_open");
120 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
121 perror(
"mnl_socket_bind");
124 portid = mnl_socket_get_portid(nl);
126 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
127 mnl_nlmsg_batch_size(batch)) < 0) {
128 perror(
"mnl_socket_send");
132 mnl_nlmsg_batch_stop(batch);
134 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
136 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
140 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
146 mnl_socket_close(nl);