7 #include <sys/socket.h>
10 #include <linux/netlink.h>
11 #include <linux/netfilter/nfnetlink.h>
12 #include <linux/netfilter/nf_tables.h>
14 #include <libmnl/libmnl.h>
15 #include <libnftnl/common.h>
16 #include <libnftnl/set.h>
21 static struct nlmsghdr *__nftnl_nlmsg_build_hdr(
char *buf, uint16_t type,
23 uint16_t flags, uint32_t seq,
29 nlh = mnl_nlmsg_put_header(buf);
30 nlh->nlmsg_type = type;
31 nlh->nlmsg_flags = NLM_F_REQUEST | flags;
34 nfh = mnl_nlmsg_put_extra_header(nlh,
sizeof(
struct nfgenmsg));
35 nfh->nfgen_family = family;
36 nfh->version = NFNETLINK_V0;
37 nfh->res_id = htons(res_id);
42 EXPORT_SYMBOL(nftnl_nlmsg_build_hdr);
43 struct nlmsghdr *nftnl_nlmsg_build_hdr(
char *buf, uint16_t type, uint16_t family,
44 uint16_t flags, uint32_t seq)
46 return __nftnl_nlmsg_build_hdr(buf, (NFNL_SUBSYS_NFTABLES << 8) | type,
47 family, flags, seq, 0);
50 EXPORT_SYMBOL(nftnl_parse_err_alloc);
51 struct nftnl_parse_err *nftnl_parse_err_alloc(
void)
53 struct nftnl_parse_err *err;
55 err = calloc(1,
sizeof(
struct nftnl_parse_err));
59 err->error = NFTNL_PARSE_EOPNOTSUPP;
64 EXPORT_SYMBOL(nftnl_parse_err_free);
65 void nftnl_parse_err_free(
struct nftnl_parse_err *err)
70 EXPORT_SYMBOL(nftnl_parse_perror);
71 int nftnl_parse_perror(
const char *msg,
struct nftnl_parse_err *err)
74 case NFTNL_PARSE_EBADINPUT:
75 return fprintf(stderr,
"%s: Bad input format in line %d column %d\n",
76 msg, err->line, err->column);
77 case NFTNL_PARSE_EMISSINGNODE:
78 return fprintf(stderr,
"%s: Node \"%s\" not found\n",
80 case NFTNL_PARSE_EBADTYPE:
81 return fprintf(stderr,
"%s: Invalid type in node \"%s\"\n",
83 case NFTNL_PARSE_EOPNOTSUPP:
84 return fprintf(stderr,
"%s: Operation not supported\n", msg);
86 return fprintf(stderr,
"%s: Undefined error\n", msg);
90 EXPORT_SYMBOL(nftnl_batch_begin);
91 struct nlmsghdr *nftnl_batch_begin(
char *buf, uint32_t seq)
93 return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_BEGIN, AF_UNSPEC,
94 0, seq, NFNL_SUBSYS_NFTABLES);
97 EXPORT_SYMBOL(nftnl_batch_end);
98 struct nlmsghdr *nftnl_batch_end(
char *buf, uint32_t seq)
100 return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_END, AF_UNSPEC,
101 0, seq, NFNL_SUBSYS_NFTABLES);
104 EXPORT_SYMBOL(nftnl_batch_is_supported);
105 int nftnl_batch_is_supported(
void)
107 struct mnl_socket *nl;
108 struct mnl_nlmsg_batch *b;
109 char buf[MNL_SOCKET_BUFFER_SIZE];
110 uint32_t seq = time(NULL), req_seq;
113 nl = mnl_socket_open(NETLINK_NETFILTER);
117 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
120 b = mnl_nlmsg_batch_start(buf,
sizeof(buf));
122 nftnl_batch_begin(mnl_nlmsg_batch_current(b), seq++);
123 mnl_nlmsg_batch_next(b);
126 nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(b), NFT_MSG_NEWSET,
127 AF_INET, NLM_F_ACK, seq++);
128 mnl_nlmsg_batch_next(b);
130 nftnl_batch_end(mnl_nlmsg_batch_current(b), seq++);
131 mnl_nlmsg_batch_next(b);
133 ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(b),
134 mnl_nlmsg_batch_size(b));
138 mnl_nlmsg_batch_stop(b);
140 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
142 ret = mnl_cb_run(buf, ret, req_seq, mnl_socket_get_portid(nl),
147 ret = mnl_socket_recvfrom(nl, buf,
sizeof(buf));
149 mnl_socket_close(nl);
156 return (ret == -1 && errno == EINVAL) ? 1 : 0;
158 mnl_nlmsg_batch_stop(b);