libnftnl  1.2.9
nft-obj-del.c
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4  *
5  * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
6  */
7 
8 #include <stdlib.h>
9 #include <time.h>
10 #include <string.h>
11 #include <netinet/in.h>
12 
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 
16 #include <libmnl/libmnl.h>
17 #include <libnftnl/object.h>
18 
19 static struct nftnl_obj *obj_del_parse(int argc, char *argv[])
20 {
21  struct nftnl_obj *t;
22  uint16_t family;
23 
24  if (strcmp(argv[1], "ip") == 0)
25  family = NFPROTO_IPV4;
26  else if (strcmp(argv[1], "ip6") == 0)
27  family = NFPROTO_IPV6;
28  else if (strcmp(argv[1], "inet") == 0)
29  family = NFPROTO_INET;
30  else if (strcmp(argv[1], "bridge") == 0)
31  family = NFPROTO_BRIDGE;
32  else if (strcmp(argv[1], "arp") == 0)
33  family = NFPROTO_ARP;
34  else {
35  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
36  return NULL;
37  }
38 
39  t = nftnl_obj_alloc();
40  if (t == NULL) {
41  perror("OOM");
42  return NULL;
43  }
44 
45  nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
46  nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
47  nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_COUNTER);
48  nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
49 
50  return t;
51 }
52 
53 int main(int argc, char *argv[])
54 {
55  struct mnl_socket *nl;
56  char buf[MNL_SOCKET_BUFFER_SIZE];
57  struct nlmsghdr *nlh;
58  uint32_t portid, seq, obj_seq, family;
59  struct nftnl_obj *t;
60  struct mnl_nlmsg_batch *batch;
61  int ret;
62 
63  if (argc != 4) {
64  fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
65  exit(EXIT_FAILURE);
66  }
67 
68  t = obj_del_parse(argc, argv);
69  if (t == NULL)
70  exit(EXIT_FAILURE);
71 
72  seq = time(NULL);
73  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
74 
75  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
76  mnl_nlmsg_batch_next(batch);
77 
78  obj_seq = seq;
79  family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
80  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
81  NFT_MSG_DELOBJ, family, NLM_F_ACK,
82  seq++);
83  nftnl_obj_nlmsg_build_payload(nlh, t);
84  mnl_nlmsg_batch_next(batch);
85  nftnl_obj_free(t);
86 
87  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
88  mnl_nlmsg_batch_next(batch);
89 
90  nl = mnl_socket_open(NETLINK_NETFILTER);
91  if (nl == NULL) {
92  perror("mnl_socket_open");
93  exit(EXIT_FAILURE);
94  }
95 
96  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
97  perror("mnl_socket_bind");
98  exit(EXIT_FAILURE);
99  }
100  portid = mnl_socket_get_portid(nl);
101 
102  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
103  mnl_nlmsg_batch_size(batch)) < 0) {
104  perror("mnl_socket_send");
105  exit(EXIT_FAILURE);
106  }
107 
108  mnl_nlmsg_batch_stop(batch);
109 
110  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
111  while (ret > 0) {
112  ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
113  if (ret <= 0)
114  break;
115  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
116  }
117  if (ret == -1) {
118  perror("error");
119  exit(EXIT_FAILURE);
120  }
121  mnl_socket_close(nl);
122 
123  return EXIT_SUCCESS;
124 }