libnftnl  1.2.8
nft-flowtable-del.c
1 #include <stdlib.h>
2 #include <time.h>
3 #include <string.h>
4 #include <netinet/in.h>
5 
6 #include <linux/netfilter.h>
7 #include <linux/netfilter/nf_tables.h>
8 
9 #include <libmnl/libmnl.h>
10 #include <libnftnl/flowtable.h>
11 
12 static struct nftnl_flowtable *flowtable_del_parse(int argc, char *argv[])
13 {
14  struct nftnl_flowtable *t;
15 
16  t = nftnl_flowtable_alloc();
17  if (t == NULL) {
18  perror("OOM");
19  return NULL;
20  }
21 
22  nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_TABLE, argv[2]);
23  nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_NAME, argv[3]);
24 
25  return t;
26 }
27 
28 int main(int argc, char *argv[])
29 {
30  struct mnl_socket *nl;
31  struct mnl_nlmsg_batch *batch;
32  char buf[MNL_SOCKET_BUFFER_SIZE];
33  struct nlmsghdr *nlh;
34  uint32_t portid, seq, flowtable_seq;
35  struct nftnl_flowtable *t;
36  int ret, family;
37 
38  if (argc != 4) {
39  fprintf(stderr, "Usage: %s <family> <table> <flowtable>\n",
40  argv[0]);
41  exit(EXIT_FAILURE);
42  }
43 
44  if (strcmp(argv[1], "ip") == 0)
45  family = NFPROTO_IPV4;
46  else if (strcmp(argv[1], "ip6") == 0)
47  family = NFPROTO_IPV6;
48  else if (strcmp(argv[1], "inet") == 0)
49  family = NFPROTO_INET;
50  else if (strcmp(argv[1], "bridge") == 0)
51  family = NFPROTO_BRIDGE;
52  else if (strcmp(argv[1], "arp") == 0)
53  family = NFPROTO_ARP;
54  else {
55  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
56  exit(EXIT_FAILURE);
57  }
58 
59  t = flowtable_del_parse(argc, argv);
60  if (t == NULL)
61  exit(EXIT_FAILURE);
62 
63  seq = time(NULL);
64  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
65 
66  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
67  mnl_nlmsg_batch_next(batch);
68 
69  flowtable_seq = seq;
70  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
71  NFT_MSG_DELFLOWTABLE, family,
72  NLM_F_ACK, seq++);
73  nftnl_flowtable_nlmsg_build_payload(nlh, t);
74  nftnl_flowtable_free(t);
75  mnl_nlmsg_batch_next(batch);
76 
77  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
78  mnl_nlmsg_batch_next(batch);
79 
80  nl = mnl_socket_open(NETLINK_NETFILTER);
81  if (nl == NULL) {
82  perror("mnl_socket_open");
83  exit(EXIT_FAILURE);
84  }
85 
86  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
87  perror("mnl_socket_bind");
88  exit(EXIT_FAILURE);
89  }
90  portid = mnl_socket_get_portid(nl);
91 
92  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
93  mnl_nlmsg_batch_size(batch)) < 0) {
94  perror("mnl_socket_send");
95  exit(EXIT_FAILURE);
96  }
97 
98  mnl_nlmsg_batch_stop(batch);
99 
100  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
101  while (ret > 0) {
102  ret = mnl_cb_run(buf, ret, flowtable_seq, portid, NULL, NULL);
103  if (ret <= 0)
104  break;
105  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
106  }
107  if (ret == -1) {
108  perror("error");
109  exit(EXIT_FAILURE);
110  }
111  mnl_socket_close(nl);
112 
113  return EXIT_SUCCESS;
114 }