This source file includes following definitions.
- do_attach
- do_detach
- print_bpf_output
- sig_handler
- usage
- main
1
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <linux/perf_event.h>
6 #include <linux/bpf.h>
7 #include <net/if.h>
8 #include <errno.h>
9 #include <assert.h>
10 #include <sys/sysinfo.h>
11 #include <sys/ioctl.h>
12 #include <signal.h>
13 #include <libbpf.h>
14 #include <bpf/bpf.h>
15 #include <sys/resource.h>
16 #include <libgen.h>
17 #include <linux/if_link.h>
18
19 #include "perf-sys.h"
20
21 #define MAX_CPUS 128
22 static int if_idx;
23 static char *if_name;
24 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
25 static __u32 prog_id;
26 static struct perf_buffer *pb = NULL;
27
28 static int do_attach(int idx, int fd, const char *name)
29 {
30 struct bpf_prog_info info = {};
31 __u32 info_len = sizeof(info);
32 int err;
33
34 err = bpf_set_link_xdp_fd(idx, fd, xdp_flags);
35 if (err < 0) {
36 printf("ERROR: failed to attach program to %s\n", name);
37 return err;
38 }
39
40 err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
41 if (err) {
42 printf("can't get prog info - %s\n", strerror(errno));
43 return err;
44 }
45 prog_id = info.id;
46
47 return err;
48 }
49
50 static int do_detach(int idx, const char *name)
51 {
52 __u32 curr_prog_id = 0;
53 int err = 0;
54
55 err = bpf_get_link_xdp_id(idx, &curr_prog_id, 0);
56 if (err) {
57 printf("bpf_get_link_xdp_id failed\n");
58 return err;
59 }
60 if (prog_id == curr_prog_id) {
61 err = bpf_set_link_xdp_fd(idx, -1, 0);
62 if (err < 0)
63 printf("ERROR: failed to detach prog from %s\n", name);
64 } else if (!curr_prog_id) {
65 printf("couldn't find a prog id on a %s\n", name);
66 } else {
67 printf("program on interface changed, not removing\n");
68 }
69
70 return err;
71 }
72
73 #define SAMPLE_SIZE 64
74
75 static void print_bpf_output(void *ctx, int cpu, void *data, __u32 size)
76 {
77 struct {
78 __u16 cookie;
79 __u16 pkt_len;
80 __u8 pkt_data[SAMPLE_SIZE];
81 } __packed *e = data;
82 int i;
83
84 if (e->cookie != 0xdead) {
85 printf("BUG cookie %x sized %d\n", e->cookie, size);
86 return;
87 }
88
89 printf("Pkt len: %-5d bytes. Ethernet hdr: ", e->pkt_len);
90 for (i = 0; i < 14 && i < e->pkt_len; i++)
91 printf("%02x ", e->pkt_data[i]);
92 printf("\n");
93 }
94
95 static void sig_handler(int signo)
96 {
97 do_detach(if_idx, if_name);
98 perf_buffer__free(pb);
99 exit(0);
100 }
101
102 static void usage(const char *prog)
103 {
104 fprintf(stderr,
105 "%s: %s [OPTS] <ifname|ifindex>\n\n"
106 "OPTS:\n"
107 " -F force loading prog\n",
108 __func__, prog);
109 }
110
111 int main(int argc, char **argv)
112 {
113 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
114 struct bpf_prog_load_attr prog_load_attr = {
115 .prog_type = BPF_PROG_TYPE_XDP,
116 };
117 struct perf_buffer_opts pb_opts = {};
118 const char *optstr = "F";
119 int prog_fd, map_fd, opt;
120 struct bpf_object *obj;
121 struct bpf_map *map;
122 char filename[256];
123 int ret, err;
124
125 while ((opt = getopt(argc, argv, optstr)) != -1) {
126 switch (opt) {
127 case 'F':
128 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
129 break;
130 default:
131 usage(basename(argv[0]));
132 return 1;
133 }
134 }
135
136 if (optind == argc) {
137 usage(basename(argv[0]));
138 return 1;
139 }
140
141 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
142 perror("setrlimit(RLIMIT_MEMLOCK)");
143 return 1;
144 }
145
146 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
147 prog_load_attr.file = filename;
148
149 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
150 return 1;
151
152 if (!prog_fd) {
153 printf("load_bpf_file: %s\n", strerror(errno));
154 return 1;
155 }
156
157 map = bpf_map__next(NULL, obj);
158 if (!map) {
159 printf("finding a map in obj file failed\n");
160 return 1;
161 }
162 map_fd = bpf_map__fd(map);
163
164 if_idx = if_nametoindex(argv[optind]);
165 if (!if_idx)
166 if_idx = strtoul(argv[optind], NULL, 0);
167
168 if (!if_idx) {
169 fprintf(stderr, "Invalid ifname\n");
170 return 1;
171 }
172 if_name = argv[optind];
173 err = do_attach(if_idx, prog_fd, if_name);
174 if (err)
175 return err;
176
177 if (signal(SIGINT, sig_handler) ||
178 signal(SIGHUP, sig_handler) ||
179 signal(SIGTERM, sig_handler)) {
180 perror("signal");
181 return 1;
182 }
183
184 pb_opts.sample_cb = print_bpf_output;
185 pb = perf_buffer__new(map_fd, 8, &pb_opts);
186 err = libbpf_get_error(pb);
187 if (err) {
188 perror("perf_buffer setup failed");
189 return 1;
190 }
191
192 while ((ret = perf_buffer__poll(pb, 1000)) >= 0) {
193 }
194
195 kill(0, SIGINT);
196 return ret;
197 }