libnftnl  1.1.9
nft-ct-timeout-add.c
1 /*
2  * (C) 2012-2016 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 
10 #include <stdlib.h>
11 #include <time.h>
12 #include <string.h>
13 #include <netinet/in.h>
14 
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nf_tables.h>
17 
18 #include <obj.h>
19 #include <libmnl/libmnl.h>
20 #include <libnftnl/object.h>
21 
22 static struct nftnl_obj *obj_add_parse(int argc, char *argv[])
23 {
24  size_t timeout_array_size;
25  struct nftnl_obj *t;
26  uint32_t *timeout;
27  uint16_t family;
28  uint8_t l4proto;
29 
30  if (strcmp(argv[1], "ip") == 0)
31  family = NFPROTO_IPV4;
32  else if (strcmp(argv[1], "ip6") == 0)
33  family = NFPROTO_IPV6;
34  else if (strcmp(argv[1], "inet") == 0)
35  family = NFPROTO_INET;
36  else if (strcmp(argv[1], "bridge") == 0)
37  family = NFPROTO_BRIDGE;
38  else if (strcmp(argv[1], "arp") == 0)
39  family = NFPROTO_ARP;
40  else {
41  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
42  return NULL;
43  }
44 
45  if (strcmp(argv[4], "udp") == 0)
46  l4proto = IPPROTO_UDP;
47  else if (strcmp(argv[4], "tcp") == 0)
48  l4proto = IPPROTO_TCP;
49  else {
50  fprintf(stderr, "Unknown layer 4 protocol\n");
51  return NULL;
52  }
53 
54  t = nftnl_obj_alloc();
55  if (t == NULL) {
56  perror("OOM");
57  return NULL;
58  }
59 
60  timeout_array_size = sizeof(uint32_t) * (NFTNL_CTTIMEOUT_TCP_MAX);
61  timeout = calloc(1, timeout_array_size);
62  if (timeout == NULL) {
63  perror("OOM");
64  return NULL;
65  }
66 
67  timeout[NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 111;
68  timeout[NFTNL_CTTIMEOUT_TCP_CLOSE] = 16;
69  timeout[NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 14;
70  nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
71  nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_TIMEOUT);
72  nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
73  nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
74  nftnl_obj_set_u8(t, NFTNL_OBJ_CT_TIMEOUT_L4PROTO, l4proto);
75  nftnl_obj_set_u16(t, NFTNL_OBJ_CT_TIMEOUT_L3PROTO, NFPROTO_IPV4);
76  nftnl_obj_set_data(t, NFTNL_OBJ_CT_TIMEOUT_ARRAY,
77  timeout, timeout_array_size);
78  return t;
79 
80 }
81 
82 int main(int argc, char *argv[])
83 {
84  struct mnl_socket *nl;
85  char buf[MNL_SOCKET_BUFFER_SIZE];
86  struct nlmsghdr *nlh;
87  uint32_t portid, seq, obj_seq, family;
88  struct nftnl_obj *t;
89  struct mnl_nlmsg_batch *batch;
90  int ret;
91 
92  if (argc != 5) {
93  fprintf(stderr, "%s <family> <table> <name> <protocol> \n", argv[0]);
94  exit(EXIT_FAILURE);
95  }
96 
97  t = obj_add_parse(argc, argv);
98  if (t == NULL) {
99  exit(EXIT_FAILURE);
100  }
101 
102  seq = time(NULL);
103  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
104 
105  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
106  mnl_nlmsg_batch_next(batch);
107 
108  obj_seq = seq;
109  family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
110  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
111  NFT_MSG_NEWOBJ, family, NLM_F_ACK | NLM_F_CREATE, seq++);
112  nftnl_obj_nlmsg_build_payload(nlh, t);
113  nftnl_obj_free(t);
114  mnl_nlmsg_batch_next(batch);
115 
116  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
117  mnl_nlmsg_batch_next(batch);
118 
119  nl = mnl_socket_open(NETLINK_NETFILTER);
120  if (nl == NULL) {
121  perror("mnl_socket_open");
122  exit(EXIT_FAILURE);
123  }
124 
125  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
126  perror("mnl_socket_bind");
127  exit(EXIT_FAILURE);
128  }
129  portid = mnl_socket_get_portid(nl);
130 
131  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
132  mnl_nlmsg_batch_size(batch)) < 0) {
133  perror("mnl_socket_send");
134  exit(EXIT_FAILURE);
135  }
136 
137  mnl_nlmsg_batch_stop(batch);
138 
139  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
140  while (ret > 0) {
141  ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
142  if (ret <= 0)
143  break;
144  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
145  }
146  if (ret == -1) {
147  perror("error");
148  exit(EXIT_FAILURE);
149  }
150  mnl_socket_close(nl);
151 
152  return EXIT_SUCCESS;
153 }