libnftnl 1.2.9
nft-obj-add.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012-2016 by Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5
6#include <stdlib.h>
7#include <time.h>
8#include <string.h>
9#include <netinet/in.h>
10
11#include <linux/netfilter.h>
12#include <linux/netfilter/nf_tables.h>
13
14#include <libmnl/libmnl.h>
15#include <libnftnl/object.h>
16
17static struct nftnl_obj *obj_add_parse(int argc, char *argv[])
18{
19 struct nftnl_obj *t;
20 uint16_t family;
21
22 if (strcmp(argv[1], "ip") == 0)
23 family = NFPROTO_IPV4;
24 else if (strcmp(argv[1], "ip6") == 0)
25 family = NFPROTO_IPV6;
26 else if (strcmp(argv[1], "inet") == 0)
27 family = NFPROTO_INET;
28 else if (strcmp(argv[1], "bridge") == 0)
29 family = NFPROTO_BRIDGE;
30 else if (strcmp(argv[1], "arp") == 0)
31 family = NFPROTO_ARP;
32 else {
33 fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
34 return NULL;
35 }
36
37 t = nftnl_obj_alloc();
38 if (t == NULL) {
39 perror("OOM");
40 return NULL;
41 }
42
43 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
44 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_COUNTER);
45 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
46 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
47
48 return t;
49}
50
51int main(int argc, char *argv[])
52{
53 struct mnl_socket *nl;
54 char buf[MNL_SOCKET_BUFFER_SIZE];
55 struct nlmsghdr *nlh;
56 uint32_t portid, seq, obj_seq, family;
57 struct nftnl_obj *t;
58 struct mnl_nlmsg_batch *batch;
59 int ret;
60
61 if (argc != 4) {
62 fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
63 exit(EXIT_FAILURE);
64 }
65
66 t = obj_add_parse(argc, argv);
67 if (t == NULL)
68 exit(EXIT_FAILURE);
69
70 seq = time(NULL);
71 batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
72
73 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
74 mnl_nlmsg_batch_next(batch);
75
76 obj_seq = seq;
77 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
78 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
79 NFT_MSG_NEWOBJ, family, NLM_F_ACK, seq++);
80 nftnl_obj_nlmsg_build_payload(nlh, t);
81 nftnl_obj_free(t);
82 mnl_nlmsg_batch_next(batch);
83
84 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
85 mnl_nlmsg_batch_next(batch);
86
87 nl = mnl_socket_open(NETLINK_NETFILTER);
88 if (nl == NULL) {
89 perror("mnl_socket_open");
90 exit(EXIT_FAILURE);
91 }
92
93 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
94 perror("mnl_socket_bind");
95 exit(EXIT_FAILURE);
96 }
97 portid = mnl_socket_get_portid(nl);
98
99 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
100 mnl_nlmsg_batch_size(batch)) < 0) {
101 perror("mnl_socket_send");
102 exit(EXIT_FAILURE);
103 }
104
105 mnl_nlmsg_batch_stop(batch);
106
107 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
108 while (ret > 0) {
109 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
110 if (ret <= 0)
111 break;
112 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
113 }
114 if (ret == -1) {
115 perror("error");
116 exit(EXIT_FAILURE);
117 }
118 mnl_socket_close(nl);
119
120 return EXIT_SUCCESS;
121}