libnftnl  1.2.5
nft-set-add.c
1 /*
2  * (C) 2013 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 <stddef.h> /* for offsetof */
16 #include <netinet/in.h>
17 #include <netinet/ip.h>
18 #include <netinet/tcp.h>
19 #include <arpa/inet.h>
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <errno.h>
23 
24 #include <linux/netfilter.h>
25 #include <linux/netfilter/nfnetlink.h>
26 #include <linux/netfilter/nf_tables.h>
27 
28 #include <libmnl/libmnl.h>
29 #include <libnftnl/set.h>
30 
31 static struct nftnl_set *setup_set(uint8_t family, const char *table,
32  const char *name)
33 {
34  struct nftnl_set *s = NULL;
35 
36  s = nftnl_set_alloc();
37  if (s == NULL) {
38  perror("OOM");
39  exit(EXIT_FAILURE);
40  }
41 
42  nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
43  nftnl_set_set_str(s, NFTNL_SET_NAME, name);
44  nftnl_set_set_u32(s, NFTNL_SET_FAMILY, family);
45  nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, sizeof(uint16_t));
46  /* inet service type, see nftables/include/datatypes.h */
47  nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, 13);
48  nftnl_set_set_u32(s, NFTNL_SET_ID, 1);
49 
50  return s;
51 }
52 
53 int main(int argc, char *argv[])
54 {
55  struct mnl_socket *nl;
56  struct nftnl_set *s;
57  struct nlmsghdr *nlh;
58  struct mnl_nlmsg_batch *batch;
59  uint8_t family;
60  char buf[MNL_SOCKET_BUFFER_SIZE];
61  uint32_t seq = time(NULL);
62  int ret;
63 
64  if (argc != 4) {
65  fprintf(stderr, "Usage: %s <family> <table> <setname>\n", argv[0]);
66  exit(EXIT_FAILURE);
67  }
68 
69  if (strcmp(argv[1], "ip") == 0)
70  family = NFPROTO_IPV4;
71  else if (strcmp(argv[1], "ip6") == 0)
72  family = NFPROTO_IPV6;
73  else if (strcmp(argv[1], "inet") == 0)
74  family = NFPROTO_INET;
75  else if (strcmp(argv[1], "bridge") == 0)
76  family = NFPROTO_BRIDGE;
77  else if (strcmp(argv[1], "arp") == 0)
78  family = NFPROTO_ARP;
79  else {
80  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
81  exit(EXIT_FAILURE);
82  }
83 
84  s = setup_set(family, argv[2], argv[3]);
85 
86  nl = mnl_socket_open(NETLINK_NETFILTER);
87  if (nl == NULL) {
88  perror("mnl_socket_open");
89  exit(EXIT_FAILURE);
90  }
91 
92  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
93  perror("mnl_socket_bind");
94  exit(EXIT_FAILURE);
95  }
96 
97  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
98 
99  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
100  mnl_nlmsg_batch_next(batch);
101 
102  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
103  NFT_MSG_NEWSET, family,
104  NLM_F_CREATE | NLM_F_ACK, seq++);
105 
106  nftnl_set_nlmsg_build_payload(nlh, s);
107  nftnl_set_free(s);
108  mnl_nlmsg_batch_next(batch);
109 
110  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
111  mnl_nlmsg_batch_next(batch);
112 
113  ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
114  mnl_nlmsg_batch_size(batch));
115  if (ret == -1) {
116  perror("mnl_socket_sendto");
117  exit(EXIT_FAILURE);
118  }
119 
120  mnl_nlmsg_batch_stop(batch);
121 
122  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
123  if (ret == -1) {
124  perror("mnl_socket_recvfrom");
125  exit(EXIT_FAILURE);
126  }
127 
128  ret = mnl_cb_run(buf, ret, 0, mnl_socket_get_portid(nl), NULL, NULL);
129  if (ret < 0) {
130  perror("mnl_cb_run");
131  exit(EXIT_FAILURE);
132  }
133 
134  mnl_socket_close(nl);
135 
136  return EXIT_SUCCESS;
137 }