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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/* iplink_vrf.c VRF device support
*
* 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.
*
* Authors: Shrijeet Mukherjee <shm@cumulusnetworks.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/if_link.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static void vrf_explain(FILE *f)
{
fprintf(f, "Usage: ... vrf table TABLEID\n");
}
static void explain(void)
{
vrf_explain(stderr);
}
static int vrf_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
while (argc > 0) {
if (matches(*argv, "table") == 0) {
__u32 table;
NEXT_ARG();
if (rtnl_rttable_a2n(&table, *argv))
invarg("invalid table ID\n", *argv);
addattr32(n, 1024, IFLA_VRF_TABLE, table);
} else if (matches(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "vrf: unknown option \"%s\"?\n",
*argv);
explain();
return -1;
}
argc--, argv++;
}
return 0;
}
static void vrf_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
if (!tb)
return;
if (tb[IFLA_VRF_TABLE])
print_uint(PRINT_ANY,
"table",
"table %u ",
rta_getattr_u32(tb[IFLA_VRF_TABLE]));
}
static void vrf_slave_print_opt(struct link_util *lu, FILE *f,
struct rtattr *tb[])
{
if (!tb)
return;
if (tb[IFLA_VRF_PORT_TABLE]) {
print_uint(PRINT_ANY,
"table",
"table %u ",
rta_getattr_u32(tb[IFLA_VRF_PORT_TABLE]));
}
}
static void vrf_print_help(struct link_util *lu, int argc, char **argv,
FILE *f)
{
vrf_explain(f);
}
struct link_util vrf_link_util = {
.id = "vrf",
.maxattr = IFLA_VRF_MAX,
.parse_opt = vrf_parse_opt,
.print_opt = vrf_print_opt,
.print_help = vrf_print_help,
};
struct link_util vrf_slave_link_util = {
.id = "vrf_slave",
.maxattr = IFLA_VRF_PORT_MAX,
.print_opt = vrf_slave_print_opt,
};
/* returns table id if name is a VRF device */
__u32 ipvrf_get_table(const char *name)
{
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
} req = {
.n = {
.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.nlmsg_flags = NLM_F_REQUEST,
.nlmsg_type = RTM_GETLINK,
},
.i = {
.ifi_family = preferred_family,
},
};
struct nlmsghdr *answer;
struct rtattr *tb[IFLA_MAX+1];
struct rtattr *li[IFLA_INFO_MAX+1];
struct rtattr *vrf_attr[IFLA_VRF_MAX + 1];
struct ifinfomsg *ifi;
__u32 tb_id = 0;
int len;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0) {
/* special case "default" vrf to be the main table */
if (errno == ENODEV && !strcmp(name, "default"))
if (rtnl_rttable_a2n(&tb_id, "main"))
fprintf(stderr,
"BUG: RTTable \"main\" not found.\n");
return tb_id;
}
ifi = NLMSG_DATA(answer);
len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
if (len < 0) {
fprintf(stderr, "BUG: Invalid response to link query.\n");
goto out;
}
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (!tb[IFLA_LINKINFO])
goto out;
parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!li[IFLA_INFO_KIND] || !li[IFLA_INFO_DATA])
goto out;
if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
goto out;
parse_rtattr_nested(vrf_attr, IFLA_VRF_MAX, li[IFLA_INFO_DATA]);
if (vrf_attr[IFLA_VRF_TABLE])
tb_id = rta_getattr_u32(vrf_attr[IFLA_VRF_TABLE]);
if (!tb_id)
fprintf(stderr, "BUG: VRF %s is missing table id\n", name);
out:
free(answer);
return tb_id;
}
int name_is_vrf(const char *name)
{
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
} req = {
.n = {
.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.nlmsg_flags = NLM_F_REQUEST,
.nlmsg_type = RTM_GETLINK,
},
.i = {
.ifi_family = preferred_family,
},
};
struct nlmsghdr *answer;
struct rtattr *tb[IFLA_MAX+1];
struct rtattr *li[IFLA_INFO_MAX+1];
struct ifinfomsg *ifi;
int ifindex = 0;
int len;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0)
return 0;
ifi = NLMSG_DATA(answer);
len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
if (len < 0) {
fprintf(stderr, "BUG: Invalid response to link query.\n");
goto out;
}
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (!tb[IFLA_LINKINFO])
goto out;
parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!li[IFLA_INFO_KIND])
goto out;
if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
goto out;
ifindex = ifi->ifi_index;
out:
free(answer);
return ifindex;
}
|
