15#include <netinet/in.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables_compat.h>
20#include <libmnl/libmnl.h>
22static int data_attr_cb(
const struct nlattr *attr,
void *data)
24 const struct nlattr **tb = data;
25 int type = mnl_attr_get_type(attr);
27 if (mnl_attr_type_valid(attr, NFTA_COMPAT_MAX) < 0)
31 case NFTA_COMPAT_NAME:
32 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
33 perror(
"mnl_attr_validate");
38 case NFTA_COMPAT_TYPE:
39 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
40 perror(
"mnl_attr_validate");
49static int cb(
const struct nlmsghdr *nlh,
void *data)
51 struct nlattr *tb[NFTA_COMPAT_MAX+1] = {};
52 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
54 if (mnl_attr_parse(nlh,
sizeof(*nfg), data_attr_cb, tb) < 0)
57 if (tb[NFTA_COMPAT_NAME])
58 printf(
"name=%s ", mnl_attr_get_str(tb[NFTA_COMPAT_NAME]));
59 if (tb[NFTA_COMPAT_REV])
60 printf(
"rev=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
61 if (tb[NFTA_COMPAT_TYPE])
62 printf(
"type=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
69int main(
int argc,
char *argv[])
71 struct mnl_socket *nl;
72 char buf[MNL_SOCKET_BUFFER_SIZE];
74 uint32_t portid, seq, rev, type;
78 fprintf(stderr,
"Usage: %s <extension_name> <type> <rev>\n",
83 if (strcmp(argv[2],
"target") == 0)
85 else if (strcmp(argv[2],
"match") == 0)
88 fprintf(stderr,
"type should be `target' or `match'\n");
93 nlh = mnl_nlmsg_put_header(buf);
94 nlh->nlmsg_type = (NFNL_SUBSYS_NFT_COMPAT << 8) | NFNL_MSG_COMPAT_GET;
95 nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
96 nlh->nlmsg_seq = seq = time(NULL);
98 struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh,
sizeof(*nfg));
99 nfg->nfgen_family = AF_INET;
100 nfg->version = NFNETLINK_V0;
103 mnl_attr_put_strz(nlh, NFTA_COMPAT_NAME, argv[1]);
104 mnl_attr_put_u32(nlh, NFTA_COMPAT_REV, htonl(rev));
105 mnl_attr_put_u32(nlh, NFTA_COMPAT_TYPE, htonl(type));
107 printf(
"requesting `%s' rev=%d type=%d\n", argv[1], rev, type);
109 nl = mnl_socket_open(NETLINK_NETFILTER);
111 perror(
"mnl_socket_open");
115 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
116 perror(
"mnl_socket_bind");
119 portid = mnl_socket_get_portid(nl);
121 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
122 perror(
"mnl_socket_send");
126 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
128 ret = mnl_cb_run(buf, ret, seq, portid, cb, NULL);
131 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
137 mnl_socket_close(nl);