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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <inttypes.h>
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
#include <libgtpnl/gtp.h>
#include <libgtpnl/gtpnl.h>
#include <net/if.h>
#include <linux/gtp_nl.h>
#include "internal.h"
static void gtp_build_payload(struct nlmsghdr *nlh, uint64_t tid,
uint32_t ifidx, uint32_t sgsn_addr,
uint32_t ms_addr, uint32_t version)
{
mnl_attr_put_u32(nlh, GTPA_VERSION, version);
mnl_attr_put_u32(nlh, GTPA_LINK, ifidx);
mnl_attr_put_u32(nlh, GTPA_SGSN_ADDRESS, sgsn_addr);
mnl_attr_put_u32(nlh, GTPA_MS_ADDRESS, ms_addr);
mnl_attr_put_u64(nlh, GTPA_TID, tid);
}
int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
{
struct nlmsghdr *nlh;
char buf[MNL_SOCKET_BUFFER_SIZE];
uint32_t seq = time(NULL);
if (t->gtp_version > GTP_V1) {
fprintf(stderr, "wrong GTP version %u, use v0 or v1\n",
t->gtp_version);
return -1;
}
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_EXCL | NLM_F_ACK, ++seq,
GTP_CMD_TUNNEL_NEW);
gtp_build_payload(nlh, t->tid, t->ifidx, t->sgsn_addr.s_addr,
t->ms_addr.s_addr, t->gtp_version);
if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
perror("genl_socket_talk");
return 0;
}
EXPORT_SYMBOL(gtp_add_tunnel);
int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t seq = time(NULL);
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_ACK, ++seq,
GTP_CMD_TUNNEL_DELETE);
gtp_build_payload(nlh, t->tid, t->ifidx, 0, 0, t->gtp_version);
if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0)
perror("genl_socket_talk");
return 0;
}
EXPORT_SYMBOL(gtp_del_tunnel);
struct gtp_pdp {
uint32_t version;
uint64_t tid;
struct in_addr sgsn_addr;
struct in_addr ms_addr;
};
static int genl_gtp_validate_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, CTRL_ATTR_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case GTPA_TID:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
case GTPA_SGSN_ADDRESS:
case GTPA_MS_ADDRESS:
case GTPA_VERSION:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
default:
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int genl_gtp_attr_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[GTPA_MAX + 1] = {};
struct gtp_pdp pdp = {};
struct genlmsghdr *genl;
mnl_attr_parse(nlh, sizeof(*genl), genl_gtp_validate_cb, tb);
if (tb[GTPA_TID])
pdp.tid = mnl_attr_get_u64(tb[GTPA_TID]);
if (tb[GTPA_SGSN_ADDRESS]) {
pdp.sgsn_addr.s_addr =
mnl_attr_get_u32(tb[GTPA_SGSN_ADDRESS]);
}
if (tb[GTPA_MS_ADDRESS]) {
pdp.ms_addr.s_addr = mnl_attr_get_u32(tb[GTPA_MS_ADDRESS]);
}
if (tb[GTPA_VERSION]) {
pdp.version = mnl_attr_get_u32(tb[GTPA_VERSION]);
}
printf("version %u ", pdp.version);
printf("tid %"PRIu64" ms_addr %s ", pdp.tid, inet_ntoa(pdp.sgsn_addr));
printf("sgsn_addr %s\n", inet_ntoa(pdp.ms_addr));
return MNL_CB_OK;
}
int gtp_list_tunnel(int genl_id, struct mnl_socket *nl)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t seq = time(NULL);
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_DUMP, 0,
GTP_CMD_TUNNEL_GET);
if (genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL) < 0) {
perror("genl_socket_talk");
return 0;
}
return 0;
}
EXPORT_SYMBOL(gtp_list_tunnel);
|
