1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <netinet/in.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables_compat.h>
#include <libmnl/libmnl.h>
static int data_attr_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_COMPAT_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_COMPAT_NAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
case NFTA_COMPAT_REV:
case NFTA_COMPAT_TYPE:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[NFTA_COMPAT_MAX+1] = {};
struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
mnl_attr_parse(nlh, sizeof(*nfg), data_attr_cb, tb);
if (tb[NFTA_COMPAT_NAME])
printf("name=%s ", mnl_attr_get_str(tb[NFTA_COMPAT_NAME]));
if (tb[NFTA_COMPAT_REV])
printf("rev=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
if (tb[NFTA_COMPAT_TYPE])
printf("type=%d ", ntohl(mnl_attr_get_u32(tb[NFTA_COMPAT_REV])));
printf("\n");
return MNL_CB_OK;
}
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t portid, seq, rev, type;
int ret;
if (argc != 4) {
fprintf(stderr, "Usage: %s <extension_name> <type> <rev>\n",
argv[0]);
return EXIT_FAILURE;
}
if (strcmp(argv[2], "target") == 0)
type = 1;
else if (strcmp(argv[2], "match") == 0)
type = 0;
else {
fprintf(stderr, "type should be `target' or `match'\n");
return EXIT_FAILURE;
}
rev = atoi(argv[3]);
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = (NFNL_SUBSYS_NFT_COMPAT << 8) | NFNL_MSG_COMPAT_GET;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
nlh->nlmsg_seq = seq = time(NULL);
struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
nfg->nfgen_family = AF_INET;
nfg->version = NFNETLINK_V0;
nfg->res_id = 0;
mnl_attr_put_strz(nlh, NFTA_COMPAT_NAME, argv[1]);
mnl_attr_put_u32(nlh, NFTA_COMPAT_REV, htonl(rev));
mnl_attr_put_u32(nlh, NFTA_COMPAT_TYPE, htonl(type));
printf("requesting `%s' rev=%d type=%d\n", argv[1], rev, type);
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) {
perror("mnl_socket_open");
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
perror("mnl_socket_bind");
exit(EXIT_FAILURE);
}
portid = mnl_socket_get_portid(nl);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
perror("mnl_socket_send");
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, portid, cb, NULL);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return EXIT_SUCCESS;
}
|
