1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
3
4 #include <linux/bpf.h>
5 #include <linux/if_link.h>
6 #include <arpa/inet.h>
7 #include <assert.h>
8 #include <errno.h>
9 #include <signal.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <unistd.h>
14 #include <libgen.h>
15 #include <net/if.h>
16 #include <sys/types.h>
17 #include <sys/socket.h>
18 #include <netdb.h>
19
20 #include "bpf/bpf.h"
21 #include "bpf/libbpf.h"
22
23 #include "xdping.h"
24 #include "testing_helpers.h"
25
26 static int ifindex;
27 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
28
29 static void cleanup(int sig)
30 {
31 bpf_xdp_detach(ifindex, xdp_flags, NULL);
32 if (sig)
33 exit(1);
34 }
35
36 static int get_stats(int fd, __u16 count, __u32 raddr)
37 {
38 struct pinginfo pinginfo = { 0 };
39 char inaddrbuf[INET_ADDRSTRLEN];
40 struct in_addr inaddr;
41 __u16 i;
42
43 inaddr.s_addr = raddr;
44
45 printf("\nXDP RTT data:\n");
46
47 if (bpf_map_lookup_elem(fd, &raddr, &pinginfo)) {
48 perror("bpf_map_lookup elem");
49 return 1;
50 }
51
52 for (i = 0; i < count; i++) {
53 if (pinginfo.times[i] == 0)
54 break;
55
56 printf("64 bytes from %s: icmp_seq=%d ttl=64 time=%#.5f ms\n",
57 inet_ntop(AF_INET, &inaddr, inaddrbuf,
58 sizeof(inaddrbuf)),
59 count + i + 1,
60 (double)pinginfo.times[i]/1000000);
61 }
62
63 if (i < count) {
64 fprintf(stderr, "Expected %d samples, got %d.\n", count, i);
65 return 1;
66 }
67
68 bpf_map_delete_elem(fd, &raddr);
69
70 return 0;
71 }
72
73 static void show_usage(const char *prog)
74 {
75 fprintf(stderr,
76 "usage: %s [OPTS] -I interface destination\n\n"
77 "OPTS:\n"
78 " -c count Stop after sending count requests\n"
79 " (default %d, max %d)\n"
80 " -I interface interface name\n"
81 " -N Run in driver mode\n"
82 " -s Server mode\n"
83 " -S Run in skb mode\n",
84 prog, XDPING_DEFAULT_COUNT, XDPING_MAX_COUNT);
85 }
86
87 int main(int argc, char **argv)
88 {
89 __u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
90 struct addrinfo *a, hints = { .ai_family = AF_INET };
91 __u16 count = XDPING_DEFAULT_COUNT;
92 struct pinginfo pinginfo = { 0 };
93 const char *optstr = "c:I:NsS";
94 struct bpf_program *main_prog;
95 int prog_fd = -1, map_fd = -1;
96 struct sockaddr_in rin;
97 struct bpf_object *obj;
98 struct bpf_map *map;
99 char *ifname = NULL;
100 char filename[256];
101 int opt, ret = 1;
102 __u32 raddr = 0;
103 int server = 0;
104 char cmd[256];
105
106 while ((opt = getopt(argc, argv, optstr)) != -1) {
107 switch (opt) {
108 case 'c':
109 count = atoi(optarg);
110 if (count < 1 || count > XDPING_MAX_COUNT) {
111 fprintf(stderr,
112 "min count is 1, max count is %d\n",
113 XDPING_MAX_COUNT);
114 return 1;
115 }
116 break;
117 case 'I':
118 ifname = optarg;
119 ifindex = if_nametoindex(ifname);
120 if (!ifindex) {
121 fprintf(stderr, "Could not get interface %s\n",
122 ifname);
123 return 1;
124 }
125 break;
126 case 'N':
127 xdp_flags |= XDP_FLAGS_DRV_MODE;
128 break;
129 case 's':
130 /* use server program */
131 server = 1;
132 break;
133 case 'S':
134 xdp_flags |= XDP_FLAGS_SKB_MODE;
135 break;
136 default:
137 show_usage(basename(argv[0]));
138 return 1;
139 }
140 }
141
142 if (!ifname) {
143 show_usage(basename(argv[0]));
144 return 1;
145 }
146 if (!server && optind == argc) {
147 show_usage(basename(argv[0]));
148 return 1;
149 }
150
151 if ((xdp_flags & mode_flags) == mode_flags) {
152 fprintf(stderr, "-N or -S can be specified, not both.\n");
153 show_usage(basename(argv[0]));
154 return 1;
155 }
156
157 if (!server) {
158 /* Only supports IPv4; see hints initiailization above. */
159 if (getaddrinfo(argv[optind], NULL, &hints, &a) || !a) {
160 fprintf(stderr, "Could not resolve %s\n", argv[optind]);
161 return 1;
162 }
163 memcpy(&rin, a->ai_addr, sizeof(rin));
164 raddr = rin.sin_addr.s_addr;
165 freeaddrinfo(a);
166 }
167
168 /* Use libbpf 1.0 API mode */
169 libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
170
171 snprintf(filename, sizeof(filename), "%s_kern.bpf.o", argv[0]);
172
173 if (bpf_prog_test_load(filename, BPF_PROG_TYPE_XDP, &obj, &prog_fd)) {
174 fprintf(stderr, "load of %s failed\n", filename);
175 return 1;
176 }
177
178 main_prog = bpf_object__find_program_by_name(obj,
179 server ? "xdping_server" : "xdping_client");
180 if (main_prog)
181 prog_fd = bpf_program__fd(main_prog);
182 if (!main_prog || prog_fd < 0) {
183 fprintf(stderr, "could not find xdping program");
184 return 1;
185 }
186
187 map = bpf_object__next_map(obj, NULL);
188 if (map)
189 map_fd = bpf_map__fd(map);
190 if (!map || map_fd < 0) {
191 fprintf(stderr, "Could not find ping map");
192 goto done;
193 }
194
195 signal(SIGINT, cleanup);
196 signal(SIGTERM, cleanup);
197
198 printf("Setting up XDP for %s, please wait...\n", ifname);
199
200 printf("XDP setup disrupts network connectivity, hit Ctrl+C to quit\n");
201
202 if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
203 fprintf(stderr, "Link set xdp fd failed for %s\n", ifname);
204 goto done;
205 }
206
207 if (server) {
208 close(prog_fd);
209 close(map_fd);
210 printf("Running server on %s; press Ctrl+C to exit...\n",
211 ifname);
212 do { } while (1);
213 }
214
215 /* Start xdping-ing from last regular ping reply, e.g. for a count
216 * of 10 ICMP requests, we start xdping-ing using reply with seq number
217 * 10. The reason the last "real" ping RTT is much higher is that
218 * the ping program sees the ICMP reply associated with the last
219 * XDP-generated packet, so ping doesn't get a reply until XDP is done.
220 */
221 pinginfo.seq = htons(count);
222 pinginfo.count = count;
223
224 if (bpf_map_update_elem(map_fd, &raddr, &pinginfo, BPF_ANY)) {
225 fprintf(stderr, "could not communicate with BPF map: %s\n",
226 strerror(errno));
227 cleanup(0);
228 goto done;
229 }
230
231 /* We need to wait for XDP setup to complete. */
232 sleep(10);
233
234 snprintf(cmd, sizeof(cmd), "ping -c %d -I %s %s",
235 count, ifname, argv[optind]);
236
237 printf("\nNormal ping RTT data\n");
238 printf("[Ignore final RTT; it is distorted by XDP using the reply]\n");
239
240 ret = system(cmd);
241
242 if (!ret)
243 ret = get_stats(map_fd, count, raddr);
244
245 cleanup(0);
246
247 done:
248 if (prog_fd > 0)
249 close(prog_fd);
250 if (map_fd > 0)
251 close(map_fd);
252
253 return ret;
254 }
255
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