libnftnl  1.2.5
nft-obj-del.c
1 /*
2  * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
10  */
11 
12 #include <stdlib.h>
13 #include <time.h>
14 #include <string.h>
15 #include <netinet/in.h>
16 
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nf_tables.h>
19 
20 #include <libmnl/libmnl.h>
21 #include <libnftnl/object.h>
22 
23 static struct nftnl_obj *obj_del_parse(int argc, char *argv[])
24 {
25  struct nftnl_obj *t;
26  uint16_t family;
27 
28  if (strcmp(argv[1], "ip") == 0)
29  family = NFPROTO_IPV4;
30  else if (strcmp(argv[1], "ip6") == 0)
31  family = NFPROTO_IPV6;
32  else if (strcmp(argv[1], "inet") == 0)
33  family = NFPROTO_INET;
34  else if (strcmp(argv[1], "bridge") == 0)
35  family = NFPROTO_BRIDGE;
36  else if (strcmp(argv[1], "arp") == 0)
37  family = NFPROTO_ARP;
38  else {
39  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
40  return NULL;
41  }
42 
43  t = nftnl_obj_alloc();
44  if (t == NULL) {
45  perror("OOM");
46  return NULL;
47  }
48 
49  nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
50  nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
51  nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_COUNTER);
52  nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
53 
54  return t;
55 }
56 
57 int main(int argc, char *argv[])
58 {
59  struct mnl_socket *nl;
60  char buf[MNL_SOCKET_BUFFER_SIZE];
61  struct nlmsghdr *nlh;
62  uint32_t portid, seq, obj_seq, family;
63  struct nftnl_obj *t;
64  struct mnl_nlmsg_batch *batch;
65  int ret;
66 
67  if (argc != 4) {
68  fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
69  exit(EXIT_FAILURE);
70  }
71 
72  t = obj_del_parse(argc, argv);
73  if (t == NULL)
74  exit(EXIT_FAILURE);
75 
76  seq = time(NULL);
77  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
78 
79  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
80  mnl_nlmsg_batch_next(batch);
81 
82  obj_seq = seq;
83  family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
84  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
85  NFT_MSG_DELOBJ, family, NLM_F_ACK,
86  seq++);
87  nftnl_obj_nlmsg_build_payload(nlh, t);
88  mnl_nlmsg_batch_next(batch);
89  nftnl_obj_free(t);
90 
91  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
92  mnl_nlmsg_batch_next(batch);
93 
94  nl = mnl_socket_open(NETLINK_NETFILTER);
95  if (nl == NULL) {
96  perror("mnl_socket_open");
97  exit(EXIT_FAILURE);
98  }
99 
100  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
101  perror("mnl_socket_bind");
102  exit(EXIT_FAILURE);
103  }
104  portid = mnl_socket_get_portid(nl);
105 
106  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
107  mnl_nlmsg_batch_size(batch)) < 0) {
108  perror("mnl_socket_send");
109  exit(EXIT_FAILURE);
110  }
111 
112  mnl_nlmsg_batch_stop(batch);
113 
114  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
115  while (ret > 0) {
116  ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
117  if (ret <= 0)
118  break;
119  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
120  }
121  if (ret == -1) {
122  perror("error");
123  exit(EXIT_FAILURE);
124  }
125  mnl_socket_close(nl);
126 
127  return EXIT_SUCCESS;
128 }