11 #include <netinet/in.h>
13 #include <linux/netfilter/nfnetlink.h>
14 #include <linux/netfilter/nf_tables_compat.h>
16 #include <libmnl/libmnl.h>
18 static int data_attr_cb(
const struct nlattr *attr,
void *data)
20 const struct nlattr **tb = data;
21 int type = mnl_attr_get_type(attr);
23 if (mnl_attr_type_valid(attr, NFTA_COMPAT_MAX) < 0)
27 case NFTA_COMPAT_NAME:
28 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
29 perror(
"mnl_attr_validate");
34 case NFTA_COMPAT_TYPE:
35 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
36 perror(
"mnl_attr_validate");
45 static int cb(
const struct nlmsghdr *nlh,
void *data)
47 struct nlattr *tb[NFTA_COMPAT_MAX+1] = {};
48 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
50 if (mnl_attr_parse(nlh,
sizeof(*nfg), data_attr_cb, tb) < 0)
53 if (tb[NFTA_COMPAT_NAME])
54 printf(
"name=%s ", mnl_attr_get_str(tb[NFTA_COMPAT_NAME]));
55 if (tb[NFTA_COMPAT_REV])
56 printf(
"rev=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
57 if (tb[NFTA_COMPAT_TYPE])
58 printf(
"type=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
65 int main(
int argc,
char *argv[])
67 struct mnl_socket *nl;
68 char buf[MNL_SOCKET_BUFFER_SIZE];
70 uint32_t portid, seq, rev, type;
74 fprintf(stderr,
"Usage: %s <extension_name> <type> <rev>\n",
79 if (strcmp(argv[2],
"target") == 0)
81 else if (strcmp(argv[2],
"match") == 0)
84 fprintf(stderr,
"type should be `target' or `match'\n");
89 nlh = mnl_nlmsg_put_header(buf);
90 nlh->nlmsg_type = (NFNL_SUBSYS_NFT_COMPAT << 8) | NFNL_MSG_COMPAT_GET;
91 nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
92 nlh->nlmsg_seq = seq = time(NULL);
94 struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh,
sizeof(*nfg));
95 nfg->nfgen_family = AF_INET;
96 nfg->version = NFNETLINK_V0;
99 mnl_attr_put_strz(nlh, NFTA_COMPAT_NAME, argv[1]);
100 mnl_attr_put_u32(nlh, NFTA_COMPAT_REV, htonl(rev));
101 mnl_attr_put_u32(nlh, NFTA_COMPAT_TYPE, htonl(type));
103 printf(
"requesting `%s' rev=%d type=%d\n", argv[1], rev, type);
105 nl = mnl_socket_open(NETLINK_NETFILTER);
107 perror(
"mnl_socket_open");
111 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
112 perror(
"mnl_socket_bind");
115 portid = mnl_socket_get_portid(nl);
117 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
118 perror(
"mnl_socket_send");
122 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
124 ret = mnl_cb_run(buf, ret, seq, portid, cb, NULL);
127 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
133 mnl_socket_close(nl);