libnftnl 1.2.6
nft-flowtable-get.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
12static int table_cb(const struct nlmsghdr *nlh, void *data)
13{
14 struct nftnl_flowtable *t;
15 char buf[4096];
16 uint32_t *type = data;
17
18 t = nftnl_flowtable_alloc();
19 if (t == NULL) {
20 perror("OOM");
21 goto err;
22 }
23
24 if (nftnl_flowtable_nlmsg_parse(nlh, t) < 0) {
25 perror("nftnl_flowtable_nlmsg_parse");
26 goto err_free;
27 }
28
29 nftnl_flowtable_snprintf(buf, sizeof(buf), t, *type, 0);
30 printf("%s\n", buf);
31
32err_free:
33 nftnl_flowtable_free(t);
34err:
35 return MNL_CB_OK;
36}
37
38int main(int argc, char *argv[])
39{
40 struct mnl_socket *nl;
41 char buf[MNL_SOCKET_BUFFER_SIZE];
42 struct nlmsghdr *nlh;
43 uint32_t portid, seq, type = NFTNL_OUTPUT_DEFAULT;
44 struct nftnl_flowtable *t = NULL;
45 int ret, family;
46
47 seq = time(NULL);
48
49 if (argc < 2 || argc > 5) {
50 fprintf(stderr, "Usage: %s <family> [<table> <flowtable>]\n",
51 argv[0]);
52 exit(EXIT_FAILURE);
53 }
54
55 if (strcmp(argv[1], "ip") == 0)
56 family = NFPROTO_IPV4;
57 else if (strcmp(argv[1], "ip6") == 0)
58 family = NFPROTO_IPV6;
59 else if (strcmp(argv[1], "inet") == 0)
60 family = NFPROTO_INET;
61 else if (strcmp(argv[1], "bridge") == 0)
62 family = NFPROTO_BRIDGE;
63 else if (strcmp(argv[1], "arp") == 0)
64 family = NFPROTO_ARP;
65 else if (strcmp(argv[1], "unspec") == 0)
66 family = NFPROTO_UNSPEC;
67 else {
68 fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp, unspec\n");
69 exit(EXIT_FAILURE);
70 }
71
72 if (argc >= 4) {
73 t = nftnl_flowtable_alloc();
74 if (t == NULL) {
75 perror("OOM");
76 exit(EXIT_FAILURE);
77 }
78 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETFLOWTABLE, family,
79 NLM_F_ACK, seq);
80 nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_TABLE, argv[2]);
81 nftnl_flowtable_set_str(t, NFTNL_FLOWTABLE_NAME, argv[3]);
82 nftnl_flowtable_nlmsg_build_payload(nlh, t);
83 nftnl_flowtable_free(t);
84 } else if (argc >= 2) {
85 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETFLOWTABLE, family,
86 NLM_F_DUMP, seq);
87 }
88
89 nl = mnl_socket_open(NETLINK_NETFILTER);
90 if (nl == NULL) {
91 perror("mnl_socket_open");
92 exit(EXIT_FAILURE);
93 }
94
95 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
96 perror("mnl_socket_bind");
97 exit(EXIT_FAILURE);
98 }
99 portid = mnl_socket_get_portid(nl);
100
101 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
102 perror("mnl_socket_send");
103 exit(EXIT_FAILURE);
104 }
105
106 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
107 while (ret > 0) {
108 ret = mnl_cb_run(buf, ret, seq, portid, table_cb, &type);
109 if (ret <= 0)
110 break;
111 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
112 }
113 if (ret == -1) {
114 perror("error");
115 exit(EXIT_FAILURE);
116 }
117 mnl_socket_close(nl);
118
119 return EXIT_SUCCESS;
120}