11#include <sys/socket.h>
14#include <linux/netlink.h>
15#include <linux/netfilter/nfnetlink.h>
16#include <linux/netfilter/nf_tables.h>
18#include <libmnl/libmnl.h>
19#include <libnftnl/common.h>
20#include <libnftnl/set.h>
25static struct nlmsghdr *__nftnl_nlmsg_build_hdr(
char *buf, uint16_t type,
27 uint16_t flags, uint32_t seq,
33 nlh = mnl_nlmsg_put_header(buf);
34 nlh->nlmsg_type = type;
35 nlh->nlmsg_flags = NLM_F_REQUEST | flags;
38 nfh = mnl_nlmsg_put_extra_header(nlh,
sizeof(
struct nfgenmsg));
39 nfh->nfgen_family = family;
40 nfh->version = NFNETLINK_V0;
41 nfh->res_id = htons(res_id);
46EXPORT_SYMBOL(nftnl_nlmsg_build_hdr);
47struct nlmsghdr *nftnl_nlmsg_build_hdr(
char *buf, uint16_t type, uint16_t family,
48 uint16_t flags, uint32_t seq)
50 return __nftnl_nlmsg_build_hdr(buf, (NFNL_SUBSYS_NFTABLES << 8) | type,
51 family, flags, seq, 0);
54EXPORT_SYMBOL(nftnl_parse_err_alloc);
55struct nftnl_parse_err *nftnl_parse_err_alloc(
void)
57 struct nftnl_parse_err *err;
59 err = calloc(1,
sizeof(
struct nftnl_parse_err));
63 err->error = NFTNL_PARSE_EOPNOTSUPP;
68EXPORT_SYMBOL(nftnl_parse_err_free);
69void nftnl_parse_err_free(
struct nftnl_parse_err *err)
74EXPORT_SYMBOL(nftnl_parse_perror);
75int nftnl_parse_perror(
const char *msg,
struct nftnl_parse_err *err)
78 case NFTNL_PARSE_EBADINPUT:
79 return fprintf(stderr,
"%s: Bad input format in line %d column %d\n",
80 msg, err->line, err->column);
81 case NFTNL_PARSE_EMISSINGNODE:
82 return fprintf(stderr,
"%s: Node \"%s\" not found\n",
84 case NFTNL_PARSE_EBADTYPE:
85 return fprintf(stderr,
"%s: Invalid type in node \"%s\"\n",
87 case NFTNL_PARSE_EOPNOTSUPP:
88 return fprintf(stderr,
"%s: Operation not supported\n", msg);
90 return fprintf(stderr,
"%s: Undefined error\n", msg);
94EXPORT_SYMBOL(nftnl_batch_begin);
95struct nlmsghdr *nftnl_batch_begin(
char *buf, uint32_t seq)
97 return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_BEGIN, AF_UNSPEC,
98 0, seq, NFNL_SUBSYS_NFTABLES);
101EXPORT_SYMBOL(nftnl_batch_end);
102struct nlmsghdr *nftnl_batch_end(
char *buf, uint32_t seq)
104 return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_END, AF_UNSPEC,
105 0, seq, NFNL_SUBSYS_NFTABLES);
108EXPORT_SYMBOL(nftnl_batch_is_supported);
109int nftnl_batch_is_supported(
void)
111 struct mnl_socket *nl;
112 struct mnl_nlmsg_batch *b;
113 char buf[MNL_SOCKET_BUFFER_SIZE];
114 uint32_t seq = time(NULL), req_seq;
117 nl = mnl_socket_open(NETLINK_NETFILTER);
121 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
124 b = mnl_nlmsg_batch_start(buf,
sizeof(buf));
126 nftnl_batch_begin(mnl_nlmsg_batch_current(b), seq++);
127 mnl_nlmsg_batch_next(b);
130 nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(b), NFT_MSG_NEWSET,
131 AF_INET, NLM_F_ACK, seq++);
132 mnl_nlmsg_batch_next(b);
134 nftnl_batch_end(mnl_nlmsg_batch_current(b), seq++);
135 mnl_nlmsg_batch_next(b);
137 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(b),
138 mnl_nlmsg_batch_size(b));
142 mnl_nlmsg_batch_stop(b);
144 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
146 ret = mnl_cb_run(buf, ret, req_seq, mnl_socket_get_portid(nl),
151 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
153 mnl_socket_close(nl);
160 return (ret == -1 && errno == EINVAL) ? 1 : 0;
162 mnl_nlmsg_batch_stop(b);