libnftnl 1.2.9
nft-ct-helper-del.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4 *
5 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
6 */
7
8#include <stdlib.h>
9#include <time.h>
10#include <string.h>
11#include <netinet/in.h>
12
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
15
16#include <libmnl/libmnl.h>
17#include <libnftnl/object.h>
18
19static struct nftnl_obj *ct_helper_del_parse(int argc, char *argv[])
20{
21 struct nftnl_obj *t;
22 uint16_t family;
23
24 if (strcmp(argv[1], "ip") == 0)
25 family = NFPROTO_IPV4;
26 else if (strcmp(argv[1], "ip6") == 0)
27 family = NFPROTO_IPV6;
28 else if (strcmp(argv[1], "inet") == 0)
29 family = NFPROTO_INET;
30 else {
31 fprintf(stderr, "Unknown family: ip, ip6, inet\n");
32 return NULL;
33 }
34
35 t = nftnl_obj_alloc();
36 if (t == NULL) {
37 perror("OOM");
38 return NULL;
39 }
40
41 nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
42 nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
43 nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_HELPER);
44 nftnl_obj_set_u32(t, NFTNL_OBJ_FAMILY, family);
45
46 return t;
47}
48
49int main(int argc, char *argv[])
50{
51 struct mnl_socket *nl;
52 char buf[MNL_SOCKET_BUFFER_SIZE];
53 struct nlmsghdr *nlh;
54 uint32_t portid, seq, obj_seq, family;
55 struct nftnl_obj *t;
56 struct mnl_nlmsg_batch *batch;
57 int ret;
58
59 if (argc != 4) {
60 fprintf(stderr, "%s <family> <table> <name>\n", argv[0]);
61 exit(EXIT_FAILURE);
62 }
63
64 t = ct_helper_del_parse(argc, argv);
65 if (t == NULL)
66 exit(EXIT_FAILURE);
67
68 seq = time(NULL);
69 batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
70
71 nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
72 mnl_nlmsg_batch_next(batch);
73
74 obj_seq = seq;
75 family = nftnl_obj_get_u32(t, NFTNL_OBJ_FAMILY);
76 nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
77 NFT_MSG_DELOBJ, family, NLM_F_ACK,
78 seq++);
79 nftnl_obj_nlmsg_build_payload(nlh, t);
80 mnl_nlmsg_batch_next(batch);
81 nftnl_obj_free(t);
82
83 nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
84 mnl_nlmsg_batch_next(batch);
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 portid = mnl_socket_get_portid(nl);
97
98 if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
99 mnl_nlmsg_batch_size(batch)) < 0) {
100 perror("mnl_socket_send");
101 exit(EXIT_FAILURE);
102 }
103
104 mnl_nlmsg_batch_stop(batch);
105
106 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
107 while (ret > 0) {
108 ret = mnl_cb_run(buf, ret, obj_seq, portid, NULL, NULL);
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}