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1// SPDX-License-Identifier: GPL-2.0
2#include <uapi/linux/bpf.h>
3#include <uapi/linux/netdev.h>
4#include <linux/if_link.h>
5#include <signal.h>
6#include <argp.h>
7#include <net/if.h>
8#include <sys/socket.h>
9#include <netinet/in.h>
10#include <netinet/tcp.h>
11#include <unistd.h>
12#include <arpa/inet.h>
13#include <bpf/bpf.h>
14#include <bpf/libbpf.h>
15#include <pthread.h>
16
17#include <network_helpers.h>
18
19#include "xdp_features.skel.h"
20#include "xdp_features.h"
21
22#define RED(str) "\033[0;31m" str "\033[0m"
23#define GREEN(str) "\033[0;32m" str "\033[0m"
24#define YELLOW(str) "\033[0;33m" str "\033[0m"
25
26static struct env {
27 bool verbosity;
28 char ifname[IF_NAMESIZE];
29 int ifindex;
30 bool is_tester;
31 struct {
32 enum netdev_xdp_act drv_feature;
33 enum xdp_action action;
34 } feature;
35 struct sockaddr_storage dut_ctrl_addr;
36 struct sockaddr_storage dut_addr;
37 struct sockaddr_storage tester_addr;
38} env;
39
40#define BUFSIZE 128
41
42void test__fail(void) { /* for network_helpers.c */ }
43
44static int libbpf_print_fn(enum libbpf_print_level level,
45 const char *format, va_list args)
46{
47 if (level == LIBBPF_DEBUG && !env.verbosity)
48 return 0;
49 return vfprintf(stderr, format, args);
50}
51
52static volatile bool exiting;
53
54static void sig_handler(int sig)
55{
56 exiting = true;
57}
58
59const char *argp_program_version = "xdp-features 0.0";
60const char argp_program_doc[] =
61"XDP features detection application.\n"
62"\n"
63"XDP features application checks the XDP advertised features match detected ones.\n"
64"\n"
65"USAGE: ./xdp-features [-vt] [-f <xdp-feature>] [-D <dut-data-ip>] [-T <tester-data-ip>] [-C <dut-ctrl-ip>] <iface-name>\n"
66"\n"
67"dut-data-ip, tester-data-ip, dut-ctrl-ip: IPv6 or IPv4-mapped-IPv6 addresses;\n"
68"\n"
69"XDP features\n:"
70"- XDP_PASS\n"
71"- XDP_DROP\n"
72"- XDP_ABORTED\n"
73"- XDP_REDIRECT\n"
74"- XDP_NDO_XMIT\n"
75"- XDP_TX\n";
76
77static const struct argp_option opts[] = {
78 { "verbose", 'v', NULL, 0, "Verbose debug output" },
79 { "tester", 't', NULL, 0, "Tester mode" },
80 { "feature", 'f', "XDP-FEATURE", 0, "XDP feature to test" },
81 { "dut_data_ip", 'D', "DUT-DATA-IP", 0, "DUT IP data channel" },
82 { "dut_ctrl_ip", 'C', "DUT-CTRL-IP", 0, "DUT IP control channel" },
83 { "tester_data_ip", 'T', "TESTER-DATA-IP", 0, "Tester IP data channel" },
84 {},
85};
86
87static int get_xdp_feature(const char *arg)
88{
89 if (!strcmp(arg, "XDP_PASS")) {
90 env.feature.action = XDP_PASS;
91 env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
92 } else if (!strcmp(arg, "XDP_DROP")) {
93 env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
94 env.feature.action = XDP_DROP;
95 } else if (!strcmp(arg, "XDP_ABORTED")) {
96 env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
97 env.feature.action = XDP_ABORTED;
98 } else if (!strcmp(arg, "XDP_TX")) {
99 env.feature.drv_feature = NETDEV_XDP_ACT_BASIC;
100 env.feature.action = XDP_TX;
101 } else if (!strcmp(arg, "XDP_REDIRECT")) {
102 env.feature.drv_feature = NETDEV_XDP_ACT_REDIRECT;
103 env.feature.action = XDP_REDIRECT;
104 } else if (!strcmp(arg, "XDP_NDO_XMIT")) {
105 env.feature.drv_feature = NETDEV_XDP_ACT_NDO_XMIT;
106 } else {
107 return -EINVAL;
108 }
109
110 return 0;
111}
112
113static char *get_xdp_feature_str(void)
114{
115 switch (env.feature.action) {
116 case XDP_PASS:
117 return YELLOW("XDP_PASS");
118 case XDP_DROP:
119 return YELLOW("XDP_DROP");
120 case XDP_ABORTED:
121 return YELLOW("XDP_ABORTED");
122 case XDP_TX:
123 return YELLOW("XDP_TX");
124 case XDP_REDIRECT:
125 return YELLOW("XDP_REDIRECT");
126 default:
127 break;
128 }
129
130 if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT)
131 return YELLOW("XDP_NDO_XMIT");
132
133 return "";
134}
135
136static error_t parse_arg(int key, char *arg, struct argp_state *state)
137{
138 switch (key) {
139 case 'v':
140 env.verbosity = true;
141 break;
142 case 't':
143 env.is_tester = true;
144 break;
145 case 'f':
146 if (get_xdp_feature(arg) < 0) {
147 fprintf(stderr, "Invalid xdp feature: %s\n", arg);
148 argp_usage(state);
149 return ARGP_ERR_UNKNOWN;
150 }
151 break;
152 case 'D':
153 if (make_sockaddr(AF_INET6, arg, DUT_ECHO_PORT,
154 &env.dut_addr, NULL)) {
155 fprintf(stderr,
156 "Invalid address assigned to the Device Under Test: %s\n",
157 arg);
158 return ARGP_ERR_UNKNOWN;
159 }
160 break;
161 case 'C':
162 if (make_sockaddr(AF_INET6, arg, DUT_CTRL_PORT,
163 &env.dut_ctrl_addr, NULL)) {
164 fprintf(stderr,
165 "Invalid address assigned to the Device Under Test: %s\n",
166 arg);
167 return ARGP_ERR_UNKNOWN;
168 }
169 break;
170 case 'T':
171 if (make_sockaddr(AF_INET6, arg, 0, &env.tester_addr, NULL)) {
172 fprintf(stderr,
173 "Invalid address assigned to the Tester device: %s\n",
174 arg);
175 return ARGP_ERR_UNKNOWN;
176 }
177 break;
178 case ARGP_KEY_ARG:
179 errno = 0;
180 if (strlen(arg) >= IF_NAMESIZE) {
181 fprintf(stderr, "Invalid device name: %s\n", arg);
182 argp_usage(state);
183 return ARGP_ERR_UNKNOWN;
184 }
185
186 env.ifindex = if_nametoindex(arg);
187 if (!env.ifindex)
188 env.ifindex = strtoul(arg, NULL, 0);
189 if (!env.ifindex || !if_indextoname(env.ifindex, env.ifname)) {
190 fprintf(stderr,
191 "Bad interface index or name (%d): %s\n",
192 errno, strerror(errno));
193 argp_usage(state);
194 return ARGP_ERR_UNKNOWN;
195 }
196 break;
197 default:
198 return ARGP_ERR_UNKNOWN;
199 }
200
201 return 0;
202}
203
204static const struct argp argp = {
205 .options = opts,
206 .parser = parse_arg,
207 .doc = argp_program_doc,
208};
209
210static void set_env_default(void)
211{
212 env.feature.drv_feature = NETDEV_XDP_ACT_NDO_XMIT;
213 env.feature.action = -EINVAL;
214 env.ifindex = -ENODEV;
215 strcpy(env.ifname, "unknown");
216 make_sockaddr(AF_INET6, "::ffff:127.0.0.1", DUT_CTRL_PORT,
217 &env.dut_ctrl_addr, NULL);
218 make_sockaddr(AF_INET6, "::ffff:127.0.0.1", DUT_ECHO_PORT,
219 &env.dut_addr, NULL);
220 make_sockaddr(AF_INET6, "::ffff:127.0.0.1", 0, &env.tester_addr, NULL);
221}
222
223static void *dut_echo_thread(void *arg)
224{
225 unsigned char buf[sizeof(struct tlv_hdr)];
226 int sockfd = *(int *)arg;
227
228 while (!exiting) {
229 struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
230 struct sockaddr_storage addr;
231 socklen_t addrlen;
232 size_t n;
233
234 n = recvfrom(sockfd, buf, sizeof(buf), MSG_WAITALL,
235 (struct sockaddr *)&addr, &addrlen);
236 if (n != ntohs(tlv->len))
237 continue;
238
239 if (ntohs(tlv->type) != CMD_ECHO)
240 continue;
241
242 sendto(sockfd, buf, sizeof(buf), MSG_NOSIGNAL | MSG_CONFIRM,
243 (struct sockaddr *)&addr, addrlen);
244 }
245
246 pthread_exit((void *)0);
247 close(sockfd);
248
249 return NULL;
250}
251
252static int dut_run_echo_thread(pthread_t *t, int *sockfd)
253{
254 int err;
255
256 sockfd = start_reuseport_server(AF_INET6, SOCK_DGRAM, NULL,
257 DUT_ECHO_PORT, 0, 1);
258 if (!sockfd) {
259 fprintf(stderr,
260 "Failed creating data UDP socket on device %s\n",
261 env.ifname);
262 return -errno;
263 }
264
265 /* start echo channel */
266 err = pthread_create(t, NULL, dut_echo_thread, sockfd);
267 if (err) {
268 fprintf(stderr,
269 "Failed creating data UDP thread on device %s: %s\n",
270 env.ifname, strerror(-err));
271 free_fds(sockfd, 1);
272 return -EINVAL;
273 }
274
275 return 0;
276}
277
278static int dut_attach_xdp_prog(struct xdp_features *skel, int flags)
279{
280 enum xdp_action action = env.feature.action;
281 struct bpf_program *prog;
282 unsigned int key = 0;
283 int err, fd = 0;
284
285 if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT) {
286 struct bpf_devmap_val entry = {
287 .ifindex = env.ifindex,
288 };
289
290 err = bpf_map__update_elem(skel->maps.dev_map,
291 &key, sizeof(key),
292 &entry, sizeof(entry), 0);
293 if (err < 0)
294 return err;
295
296 fd = bpf_program__fd(skel->progs.xdp_do_redirect_cpumap);
297 action = XDP_REDIRECT;
298 }
299
300 switch (action) {
301 case XDP_TX:
302 prog = skel->progs.xdp_do_tx;
303 break;
304 case XDP_DROP:
305 prog = skel->progs.xdp_do_drop;
306 break;
307 case XDP_ABORTED:
308 prog = skel->progs.xdp_do_aborted;
309 break;
310 case XDP_PASS:
311 prog = skel->progs.xdp_do_pass;
312 break;
313 case XDP_REDIRECT: {
314 struct bpf_cpumap_val entry = {
315 .qsize = 2048,
316 .bpf_prog.fd = fd,
317 };
318
319 err = bpf_map__update_elem(skel->maps.cpu_map,
320 &key, sizeof(key),
321 &entry, sizeof(entry), 0);
322 if (err < 0)
323 return err;
324
325 prog = skel->progs.xdp_do_redirect;
326 break;
327 }
328 default:
329 return -EINVAL;
330 }
331
332 err = bpf_xdp_attach(env.ifindex, bpf_program__fd(prog), flags, NULL);
333 if (err)
334 fprintf(stderr, "Failed attaching XDP program to device %s\n",
335 env.ifname);
336 return err;
337}
338
339static int recv_msg(int sockfd, void *buf, size_t bufsize, void *val,
340 size_t val_size)
341{
342 struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
343 size_t len;
344
345 len = recv(sockfd, buf, bufsize, 0);
346 if (len != ntohs(tlv->len) || len < sizeof(*tlv))
347 return -EINVAL;
348
349 if (val) {
350 len -= sizeof(*tlv);
351 if (len > val_size)
352 return -ENOMEM;
353
354 memcpy(val, tlv->data, len);
355 }
356
357 return 0;
358}
359
360static int dut_run(struct xdp_features *skel)
361{
362 int flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE;
363 int state, err = 0, *sockfd, ctrl_sockfd, echo_sockfd;
364 struct sockaddr_storage ctrl_addr;
365 pthread_t dut_thread = 0;
366 socklen_t addrlen;
367
368 sockfd = start_reuseport_server(AF_INET6, SOCK_STREAM, NULL,
369 DUT_CTRL_PORT, 0, 1);
370 if (!sockfd) {
371 fprintf(stderr,
372 "Failed creating control socket on device %s\n", env.ifname);
373 return -errno;
374 }
375
376 ctrl_sockfd = accept(*sockfd, (struct sockaddr *)&ctrl_addr, &addrlen);
377 if (ctrl_sockfd < 0) {
378 fprintf(stderr,
379 "Failed accepting connections on device %s control socket\n",
380 env.ifname);
381 free_fds(sockfd, 1);
382 return -errno;
383 }
384
385 /* CTRL loop */
386 while (!exiting) {
387 unsigned char buf[BUFSIZE] = {};
388 struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
389
390 err = recv_msg(ctrl_sockfd, buf, BUFSIZE, NULL, 0);
391 if (err)
392 continue;
393
394 switch (ntohs(tlv->type)) {
395 case CMD_START: {
396 if (state == CMD_START)
397 continue;
398
399 state = CMD_START;
400 /* Load the XDP program on the DUT */
401 err = dut_attach_xdp_prog(skel, flags);
402 if (err)
403 goto out;
404
405 err = dut_run_echo_thread(&dut_thread, &echo_sockfd);
406 if (err < 0)
407 goto out;
408
409 tlv->type = htons(CMD_ACK);
410 tlv->len = htons(sizeof(*tlv));
411 err = send(ctrl_sockfd, buf, sizeof(*tlv), 0);
412 if (err < 0)
413 goto end_thread;
414 break;
415 }
416 case CMD_STOP:
417 if (state != CMD_START)
418 break;
419
420 state = CMD_STOP;
421
422 exiting = true;
423 bpf_xdp_detach(env.ifindex, flags, NULL);
424
425 tlv->type = htons(CMD_ACK);
426 tlv->len = htons(sizeof(*tlv));
427 err = send(ctrl_sockfd, buf, sizeof(*tlv), 0);
428 goto end_thread;
429 case CMD_GET_XDP_CAP: {
430 LIBBPF_OPTS(bpf_xdp_query_opts, opts);
431 unsigned long long val;
432 size_t n;
433
434 err = bpf_xdp_query(env.ifindex, XDP_FLAGS_DRV_MODE,
435 &opts);
436 if (err) {
437 fprintf(stderr,
438 "Failed querying XDP cap for device %s\n",
439 env.ifname);
440 goto end_thread;
441 }
442
443 tlv->type = htons(CMD_ACK);
444 n = sizeof(*tlv) + sizeof(opts.feature_flags);
445 tlv->len = htons(n);
446
447 val = htobe64(opts.feature_flags);
448 memcpy(tlv->data, &val, sizeof(val));
449
450 err = send(ctrl_sockfd, buf, n, 0);
451 if (err < 0)
452 goto end_thread;
453 break;
454 }
455 case CMD_GET_STATS: {
456 unsigned int key = 0, val;
457 size_t n;
458
459 err = bpf_map__lookup_elem(skel->maps.dut_stats,
460 &key, sizeof(key),
461 &val, sizeof(val), 0);
462 if (err) {
463 fprintf(stderr,
464 "bpf_map_lookup_elem failed (%d)\n", err);
465 goto end_thread;
466 }
467
468 tlv->type = htons(CMD_ACK);
469 n = sizeof(*tlv) + sizeof(val);
470 tlv->len = htons(n);
471
472 val = htonl(val);
473 memcpy(tlv->data, &val, sizeof(val));
474
475 err = send(ctrl_sockfd, buf, n, 0);
476 if (err < 0)
477 goto end_thread;
478 break;
479 }
480 default:
481 break;
482 }
483 }
484
485end_thread:
486 pthread_join(dut_thread, NULL);
487out:
488 bpf_xdp_detach(env.ifindex, flags, NULL);
489 close(ctrl_sockfd);
490 free_fds(sockfd, 1);
491
492 return err;
493}
494
495static bool tester_collect_detected_cap(struct xdp_features *skel,
496 unsigned int dut_stats)
497{
498 unsigned int err, key = 0, val;
499
500 if (!dut_stats)
501 return false;
502
503 err = bpf_map__lookup_elem(skel->maps.stats, &key, sizeof(key),
504 &val, sizeof(val), 0);
505 if (err) {
506 fprintf(stderr, "bpf_map_lookup_elem failed (%d)\n", err);
507 return false;
508 }
509
510 switch (env.feature.action) {
511 case XDP_PASS:
512 case XDP_TX:
513 case XDP_REDIRECT:
514 return val > 0;
515 case XDP_DROP:
516 case XDP_ABORTED:
517 return val == 0;
518 default:
519 break;
520 }
521
522 if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT)
523 return val > 0;
524
525 return false;
526}
527
528static int send_and_recv_msg(int sockfd, enum test_commands cmd, void *val,
529 size_t val_size)
530{
531 unsigned char buf[BUFSIZE] = {};
532 struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
533 int err;
534
535 tlv->type = htons(cmd);
536 tlv->len = htons(sizeof(*tlv));
537
538 err = send(sockfd, buf, sizeof(*tlv), 0);
539 if (err < 0)
540 return err;
541
542 err = recv_msg(sockfd, buf, BUFSIZE, val, val_size);
543 if (err < 0)
544 return err;
545
546 return ntohs(tlv->type) == CMD_ACK ? 0 : -EINVAL;
547}
548
549static int send_echo_msg(void)
550{
551 unsigned char buf[sizeof(struct tlv_hdr)];
552 struct tlv_hdr *tlv = (struct tlv_hdr *)buf;
553 int sockfd, n;
554
555 sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
556 if (sockfd < 0) {
557 fprintf(stderr,
558 "Failed creating data UDP socket on device %s\n",
559 env.ifname);
560 return -errno;
561 }
562
563 tlv->type = htons(CMD_ECHO);
564 tlv->len = htons(sizeof(*tlv));
565
566 n = sendto(sockfd, buf, sizeof(*tlv), MSG_NOSIGNAL | MSG_CONFIRM,
567 (struct sockaddr *)&env.dut_addr, sizeof(env.dut_addr));
568 close(sockfd);
569
570 return n == ntohs(tlv->len) ? 0 : -EINVAL;
571}
572
573static int tester_run(struct xdp_features *skel)
574{
575 int flags = XDP_FLAGS_UPDATE_IF_NOEXIST | XDP_FLAGS_DRV_MODE;
576 unsigned long long advertised_feature;
577 struct bpf_program *prog;
578 unsigned int stats;
579 int i, err, sockfd;
580 bool detected_cap;
581
582 sockfd = socket(AF_INET6, SOCK_STREAM, 0);
583 if (sockfd < 0) {
584 fprintf(stderr,
585 "Failed creating tester service control socket\n");
586 return -errno;
587 }
588
589 if (settimeo(sockfd, 1000) < 0)
590 return -EINVAL;
591
592 err = connect(sockfd, (struct sockaddr *)&env.dut_ctrl_addr,
593 sizeof(env.dut_ctrl_addr));
594 if (err) {
595 fprintf(stderr,
596 "Failed connecting to the Device Under Test control socket\n");
597 return -errno;
598 }
599
600 err = send_and_recv_msg(sockfd, CMD_GET_XDP_CAP, &advertised_feature,
601 sizeof(advertised_feature));
602 if (err < 0) {
603 close(sockfd);
604 return err;
605 }
606
607 advertised_feature = be64toh(advertised_feature);
608
609 if (env.feature.drv_feature == NETDEV_XDP_ACT_NDO_XMIT ||
610 env.feature.action == XDP_TX)
611 prog = skel->progs.xdp_tester_check_tx;
612 else
613 prog = skel->progs.xdp_tester_check_rx;
614
615 err = bpf_xdp_attach(env.ifindex, bpf_program__fd(prog), flags, NULL);
616 if (err) {
617 fprintf(stderr, "Failed attaching XDP program to device %s\n",
618 env.ifname);
619 goto out;
620 }
621
622 err = send_and_recv_msg(sockfd, CMD_START, NULL, 0);
623 if (err)
624 goto out;
625
626 for (i = 0; i < 10 && !exiting; i++) {
627 err = send_echo_msg();
628 if (err < 0)
629 goto out;
630
631 sleep(1);
632 }
633
634 err = send_and_recv_msg(sockfd, CMD_GET_STATS, &stats, sizeof(stats));
635 if (err)
636 goto out;
637
638 /* stop the test */
639 err = send_and_recv_msg(sockfd, CMD_STOP, NULL, 0);
640 /* send a new echo message to wake echo thread of the dut */
641 send_echo_msg();
642
643 detected_cap = tester_collect_detected_cap(skel, ntohl(stats));
644
645 fprintf(stdout, "Feature %s: [%s][%s]\n", get_xdp_feature_str(),
646 detected_cap ? GREEN("DETECTED") : RED("NOT DETECTED"),
647 env.feature.drv_feature & advertised_feature ? GREEN("ADVERTISED")
648 : RED("NOT ADVERTISED"));
649out:
650 bpf_xdp_detach(env.ifindex, flags, NULL);
651 close(sockfd);
652 return err < 0 ? err : 0;
653}
654
655int main(int argc, char **argv)
656{
657 struct xdp_features *skel;
658 int err;
659
660 libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
661 libbpf_set_print(libbpf_print_fn);
662
663 signal(SIGINT, sig_handler);
664 signal(SIGTERM, sig_handler);
665
666 set_env_default();
667
668 /* Parse command line arguments */
669 err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
670 if (err)
671 return err;
672
673 if (env.ifindex < 0) {
674 fprintf(stderr, "Invalid device name %s\n", env.ifname);
675 return -ENODEV;
676 }
677
678 /* Load and verify BPF application */
679 skel = xdp_features__open();
680 if (!skel) {
681 fprintf(stderr, "Failed to open and load BPF skeleton\n");
682 return -EINVAL;
683 }
684
685 skel->rodata->tester_addr =
686 ((struct sockaddr_in6 *)&env.tester_addr)->sin6_addr;
687 skel->rodata->dut_addr =
688 ((struct sockaddr_in6 *)&env.dut_addr)->sin6_addr;
689
690 /* Load & verify BPF programs */
691 err = xdp_features__load(skel);
692 if (err) {
693 fprintf(stderr, "Failed to load and verify BPF skeleton\n");
694 goto cleanup;
695 }
696
697 err = xdp_features__attach(skel);
698 if (err) {
699 fprintf(stderr, "Failed to attach BPF skeleton\n");
700 goto cleanup;
701 }
702
703 if (env.is_tester) {
704 /* Tester */
705 fprintf(stdout, "Starting tester service on device %s\n",
706 env.ifname);
707 err = tester_run(skel);
708 } else {
709 /* DUT */
710 fprintf(stdout, "Starting test on device %s\n", env.ifname);
711 err = dut_run(skel);
712 }
713
714cleanup:
715 xdp_features__destroy(skel);
716
717 return err < 0 ? -err : 0;
718}