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
227
228
229
230
231
232
233
|
// SPDX-License-Identifier: GPL-2.0
static const char *__doc__ =
"XDP multi redirect tool, using BPF_MAP_TYPE_DEVMAP and BPF_F_BROADCAST flag for bpf_redirect_map\n"
"Usage: xdp_redirect_map_multi <IFINDEX|IFNAME> <IFINDEX|IFNAME> ... <IFINDEX|IFNAME>\n";
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <assert.h>
#include <getopt.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/if.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/resource.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_util.h"
#include "xdp_sample_user.h"
#include "xdp_redirect_map_multi.skel.h"
#define MAX_IFACE_NUM 32
static int ifaces[MAX_IFACE_NUM] = {};
static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
SAMPLE_EXCEPTION_CNT | SAMPLE_DEVMAP_XMIT_CNT |
SAMPLE_DEVMAP_XMIT_CNT_MULTI | SAMPLE_SKIP_HEADING;
DEFINE_SAMPLE_INIT(xdp_redirect_map_multi);
static const struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "skb-mode", no_argument, NULL, 'S' },
{ "force", no_argument, NULL, 'F' },
{ "load-egress", no_argument, NULL, 'X' },
{ "stats", no_argument, NULL, 's' },
{ "interval", required_argument, NULL, 'i' },
{ "verbose", no_argument, NULL, 'v' },
{}
};
static int update_mac_map(struct bpf_map *map)
{
int mac_map_fd = bpf_map__fd(map);
unsigned char mac_addr[6];
unsigned int ifindex;
int i, ret = -1;
for (i = 0; ifaces[i] > 0; i++) {
ifindex = ifaces[i];
ret = get_mac_addr(ifindex, mac_addr);
if (ret < 0) {
fprintf(stderr, "get interface %d mac failed\n",
ifindex);
return ret;
}
ret = bpf_map_update_elem(mac_map_fd, &ifindex, mac_addr, 0);
if (ret < 0) {
fprintf(stderr, "Failed to update mac address for ifindex %d\n",
ifindex);
return ret;
}
}
return 0;
}
int main(int argc, char **argv)
{
struct bpf_devmap_val devmap_val = {};
struct xdp_redirect_map_multi *skel;
struct bpf_program *ingress_prog;
bool xdp_devmap_attached = false;
struct bpf_map *forward_map;
int ret = EXIT_FAIL_OPTION;
unsigned long interval = 2;
char ifname[IF_NAMESIZE];
unsigned int ifindex;
bool generic = false;
bool force = false;
bool tried = false;
bool error = true;
int i, opt;
while ((opt = getopt_long(argc, argv, "hSFXi:vs",
long_options, NULL)) != -1) {
switch (opt) {
case 'S':
generic = true;
/* devmap_xmit tracepoint not available */
mask &= ~(SAMPLE_DEVMAP_XMIT_CNT |
SAMPLE_DEVMAP_XMIT_CNT_MULTI);
break;
case 'F':
force = true;
break;
case 'X':
xdp_devmap_attached = true;
break;
case 'i':
interval = strtoul(optarg, NULL, 0);
break;
case 'v':
sample_switch_mode();
break;
case 's':
mask |= SAMPLE_REDIRECT_MAP_CNT;
break;
case 'h':
error = false;
default:
sample_usage(argv, long_options, __doc__, mask, error);
return ret;
}
}
if (argc <= optind + 1) {
sample_usage(argv, long_options, __doc__, mask, error);
return ret;
}
skel = xdp_redirect_map_multi__open();
if (!skel) {
fprintf(stderr, "Failed to xdp_redirect_map_multi__open: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end;
}
ret = sample_init_pre_load(skel);
if (ret < 0) {
fprintf(stderr, "Failed to sample_init_pre_load: %s\n", strerror(-ret));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
ret = EXIT_FAIL_OPTION;
for (i = 0; i < MAX_IFACE_NUM && argv[optind + i]; i++) {
ifaces[i] = if_nametoindex(argv[optind + i]);
if (!ifaces[i])
ifaces[i] = strtoul(argv[optind + i], NULL, 0);
if (!if_indextoname(ifaces[i], ifname)) {
fprintf(stderr, "Bad interface index or name\n");
sample_usage(argv, long_options, __doc__, mask, true);
goto end_destroy;
}
skel->rodata->from_match[i] = ifaces[i];
skel->rodata->to_match[i] = ifaces[i];
}
ret = xdp_redirect_map_multi__load(skel);
if (ret < 0) {
fprintf(stderr, "Failed to xdp_redirect_map_multi__load: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
if (xdp_devmap_attached) {
/* Update mac_map with all egress interfaces' mac addr */
if (update_mac_map(skel->maps.mac_map) < 0) {
fprintf(stderr, "Updating mac address failed\n");
ret = EXIT_FAIL;
goto end_destroy;
}
}
ret = sample_init(skel, mask);
if (ret < 0) {
fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
ret = EXIT_FAIL;
goto end_destroy;
}
ingress_prog = skel->progs.xdp_redirect_map_native;
forward_map = skel->maps.forward_map_native;
for (i = 0; ifaces[i] > 0; i++) {
ifindex = ifaces[i];
ret = EXIT_FAIL_XDP;
restart:
/* bind prog_fd to each interface */
if (sample_install_xdp(ingress_prog, ifindex, generic, force) < 0) {
if (generic && !tried) {
fprintf(stderr,
"Trying fallback to sizeof(int) as value_size for devmap in generic mode\n");
ingress_prog = skel->progs.xdp_redirect_map_general;
forward_map = skel->maps.forward_map_general;
tried = true;
goto restart;
}
goto end_destroy;
}
/* Add all the interfaces to forward group and attach
* egress devmap program if exist
*/
devmap_val.ifindex = ifindex;
if (xdp_devmap_attached)
devmap_val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_devmap_prog);
ret = bpf_map_update_elem(bpf_map__fd(forward_map), &ifindex, &devmap_val, 0);
if (ret < 0) {
fprintf(stderr, "Failed to update devmap value: %s\n",
strerror(errno));
ret = EXIT_FAIL_BPF;
goto end_destroy;
}
}
ret = sample_run(interval, NULL, NULL);
if (ret < 0) {
fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
ret = EXIT_FAIL;
goto end_destroy;
}
ret = EXIT_OK;
end_destroy:
xdp_redirect_map_multi__destroy(skel);
end:
sample_exit(ret);
}
|
