9 #include <netinet/in.h>
11 #include <linux/netfilter.h>
12 #include <linux/netfilter/nf_tables.h>
14 #include <libmnl/libmnl.h>
15 #include <libnftnl/object.h>
17 static uint16_t parse_family(
char *str,
const char *option)
19 if (strcmp(str,
"ip") == 0)
21 else if (strcmp(str,
"ip6") == 0)
23 else if (strcmp(str,
"inet") == 0)
26 fprintf(stderr,
"Unknown %s: ip, ip6, inet\n", option);
31 static uint8_t parse_l4proto(
char *str)
33 if (strcmp(str,
"udp") == 0)
35 else if (strcmp(str,
"tcp") == 0)
38 fprintf(stderr,
"Unknown l4proto: tcp, udp\n");
44 static struct nftnl_obj *ct_helper_add_parse(
int argc,
char *argv[])
47 uint16_t family, l3proto;
50 t = nftnl_obj_alloc();
56 family = parse_family(argv[1],
"family");
57 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
58 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_HELPER);
59 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
60 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
62 nftnl_obj_set_str(t, NFTNL_OBJ_CT_HELPER_NAME, argv[4]);
63 l4proto = parse_l4proto(argv[5]);
64 nftnl_obj_set_u8(t, NFTNL_OBJ_CT_HELPER_L4PROTO, l4proto);
66 l3proto = parse_family(argv[6],
"l3proto");
67 nftnl_obj_set_u16(t, NFTNL_OBJ_CT_HELPER_L3PROTO, l3proto);
73 int main(
int argc,
char *argv[])
76 uint32_t seq, obj_seq, family, portid;
77 struct mnl_nlmsg_batch *batch;
78 char buf[MNL_SOCKET_BUFFER_SIZE];
80 struct mnl_socket *nl;
84 fprintf(stderr,
"%s <family> <table> <name> <type> <l4proto> [l3proto]\n", argv[0]);
88 t = ct_helper_add_parse(argc, argv);
93 batch = mnl_nlmsg_batch_start(buf,
sizeof(buf));
95 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
96 mnl_nlmsg_batch_next(batch);
99 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
100 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
101 NFT_MSG_NEWOBJ, family, NLM_F_CREATE | NLM_F_ACK, seq++);
103 nftnl_obj_nlmsg_build_payload(nlh, t);
105 mnl_nlmsg_batch_next(batch);
107 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
108 mnl_nlmsg_batch_next(batch);
110 nl = mnl_socket_open(NETLINK_NETFILTER);
112 perror(
"mnl_socket_open");
116 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
117 perror(
"mnl_socket_bind");
120 portid = mnl_socket_get_portid(nl);
122 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
123 mnl_nlmsg_batch_size(batch)) < 0) {
124 perror(
"mnl_socket_send");
128 mnl_nlmsg_batch_stop(batch);
130 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
132 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
136 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
142 mnl_socket_close(nl);