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1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3#include <network_helpers.h>
4#include <error.h>
5#include <linux/if.h>
6#include <linux/if_tun.h>
7#include <sys/uio.h>
8
9#include "bpf_flow.skel.h"
10
11#define FLOW_CONTINUE_SADDR 0x7f00007f /* 127.0.0.127 */
12
13#ifndef IP_MF
14#define IP_MF 0x2000
15#endif
16
17#define CHECK_FLOW_KEYS(desc, got, expected) \
18 _CHECK(memcmp(&got, &expected, sizeof(got)) != 0, \
19 desc, \
20 topts.duration, \
21 "nhoff=%u/%u " \
22 "thoff=%u/%u " \
23 "addr_proto=0x%x/0x%x " \
24 "is_frag=%u/%u " \
25 "is_first_frag=%u/%u " \
26 "is_encap=%u/%u " \
27 "ip_proto=0x%x/0x%x " \
28 "n_proto=0x%x/0x%x " \
29 "flow_label=0x%x/0x%x " \
30 "sport=%u/%u " \
31 "dport=%u/%u\n", \
32 got.nhoff, expected.nhoff, \
33 got.thoff, expected.thoff, \
34 got.addr_proto, expected.addr_proto, \
35 got.is_frag, expected.is_frag, \
36 got.is_first_frag, expected.is_first_frag, \
37 got.is_encap, expected.is_encap, \
38 got.ip_proto, expected.ip_proto, \
39 got.n_proto, expected.n_proto, \
40 got.flow_label, expected.flow_label, \
41 got.sport, expected.sport, \
42 got.dport, expected.dport)
43
44struct ipv4_pkt {
45 struct ethhdr eth;
46 struct iphdr iph;
47 struct tcphdr tcp;
48} __packed;
49
50struct ipip_pkt {
51 struct ethhdr eth;
52 struct iphdr iph;
53 struct iphdr iph_inner;
54 struct tcphdr tcp;
55} __packed;
56
57struct svlan_ipv4_pkt {
58 struct ethhdr eth;
59 __u16 vlan_tci;
60 __u16 vlan_proto;
61 struct iphdr iph;
62 struct tcphdr tcp;
63} __packed;
64
65struct ipv6_pkt {
66 struct ethhdr eth;
67 struct ipv6hdr iph;
68 struct tcphdr tcp;
69} __packed;
70
71struct ipv6_frag_pkt {
72 struct ethhdr eth;
73 struct ipv6hdr iph;
74 struct frag_hdr {
75 __u8 nexthdr;
76 __u8 reserved;
77 __be16 frag_off;
78 __be32 identification;
79 } ipf;
80 struct tcphdr tcp;
81} __packed;
82
83struct dvlan_ipv6_pkt {
84 struct ethhdr eth;
85 __u16 vlan_tci;
86 __u16 vlan_proto;
87 __u16 vlan_tci2;
88 __u16 vlan_proto2;
89 struct ipv6hdr iph;
90 struct tcphdr tcp;
91} __packed;
92
93struct test {
94 const char *name;
95 union {
96 struct ipv4_pkt ipv4;
97 struct svlan_ipv4_pkt svlan_ipv4;
98 struct ipip_pkt ipip;
99 struct ipv6_pkt ipv6;
100 struct ipv6_frag_pkt ipv6_frag;
101 struct dvlan_ipv6_pkt dvlan_ipv6;
102 } pkt;
103 struct bpf_flow_keys keys;
104 __u32 flags;
105 __u32 retval;
106};
107
108#define VLAN_HLEN 4
109
110static __u32 duration;
111struct test tests[] = {
112 {
113 .name = "ipv4",
114 .pkt.ipv4 = {
115 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
116 .iph.ihl = 5,
117 .iph.protocol = IPPROTO_TCP,
118 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
119 .tcp.doff = 5,
120 .tcp.source = 80,
121 .tcp.dest = 8080,
122 },
123 .keys = {
124 .nhoff = ETH_HLEN,
125 .thoff = ETH_HLEN + sizeof(struct iphdr),
126 .addr_proto = ETH_P_IP,
127 .ip_proto = IPPROTO_TCP,
128 .n_proto = __bpf_constant_htons(ETH_P_IP),
129 .sport = 80,
130 .dport = 8080,
131 },
132 .retval = BPF_OK,
133 },
134 {
135 .name = "ipv6",
136 .pkt.ipv6 = {
137 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
138 .iph.nexthdr = IPPROTO_TCP,
139 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
140 .tcp.doff = 5,
141 .tcp.source = 80,
142 .tcp.dest = 8080,
143 },
144 .keys = {
145 .nhoff = ETH_HLEN,
146 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
147 .addr_proto = ETH_P_IPV6,
148 .ip_proto = IPPROTO_TCP,
149 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
150 .sport = 80,
151 .dport = 8080,
152 },
153 .retval = BPF_OK,
154 },
155 {
156 .name = "802.1q-ipv4",
157 .pkt.svlan_ipv4 = {
158 .eth.h_proto = __bpf_constant_htons(ETH_P_8021Q),
159 .vlan_proto = __bpf_constant_htons(ETH_P_IP),
160 .iph.ihl = 5,
161 .iph.protocol = IPPROTO_TCP,
162 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
163 .tcp.doff = 5,
164 .tcp.source = 80,
165 .tcp.dest = 8080,
166 },
167 .keys = {
168 .nhoff = ETH_HLEN + VLAN_HLEN,
169 .thoff = ETH_HLEN + VLAN_HLEN + sizeof(struct iphdr),
170 .addr_proto = ETH_P_IP,
171 .ip_proto = IPPROTO_TCP,
172 .n_proto = __bpf_constant_htons(ETH_P_IP),
173 .sport = 80,
174 .dport = 8080,
175 },
176 .retval = BPF_OK,
177 },
178 {
179 .name = "802.1ad-ipv6",
180 .pkt.dvlan_ipv6 = {
181 .eth.h_proto = __bpf_constant_htons(ETH_P_8021AD),
182 .vlan_proto = __bpf_constant_htons(ETH_P_8021Q),
183 .vlan_proto2 = __bpf_constant_htons(ETH_P_IPV6),
184 .iph.nexthdr = IPPROTO_TCP,
185 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
186 .tcp.doff = 5,
187 .tcp.source = 80,
188 .tcp.dest = 8080,
189 },
190 .keys = {
191 .nhoff = ETH_HLEN + VLAN_HLEN * 2,
192 .thoff = ETH_HLEN + VLAN_HLEN * 2 +
193 sizeof(struct ipv6hdr),
194 .addr_proto = ETH_P_IPV6,
195 .ip_proto = IPPROTO_TCP,
196 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
197 .sport = 80,
198 .dport = 8080,
199 },
200 .retval = BPF_OK,
201 },
202 {
203 .name = "ipv4-frag",
204 .pkt.ipv4 = {
205 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
206 .iph.ihl = 5,
207 .iph.protocol = IPPROTO_TCP,
208 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
209 .iph.frag_off = __bpf_constant_htons(IP_MF),
210 .tcp.doff = 5,
211 .tcp.source = 80,
212 .tcp.dest = 8080,
213 },
214 .keys = {
215 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
216 .nhoff = ETH_HLEN,
217 .thoff = ETH_HLEN + sizeof(struct iphdr),
218 .addr_proto = ETH_P_IP,
219 .ip_proto = IPPROTO_TCP,
220 .n_proto = __bpf_constant_htons(ETH_P_IP),
221 .is_frag = true,
222 .is_first_frag = true,
223 .sport = 80,
224 .dport = 8080,
225 },
226 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
227 .retval = BPF_OK,
228 },
229 {
230 .name = "ipv4-no-frag",
231 .pkt.ipv4 = {
232 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
233 .iph.ihl = 5,
234 .iph.protocol = IPPROTO_TCP,
235 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
236 .iph.frag_off = __bpf_constant_htons(IP_MF),
237 .tcp.doff = 5,
238 .tcp.source = 80,
239 .tcp.dest = 8080,
240 },
241 .keys = {
242 .nhoff = ETH_HLEN,
243 .thoff = ETH_HLEN + sizeof(struct iphdr),
244 .addr_proto = ETH_P_IP,
245 .ip_proto = IPPROTO_TCP,
246 .n_proto = __bpf_constant_htons(ETH_P_IP),
247 .is_frag = true,
248 .is_first_frag = true,
249 },
250 .retval = BPF_OK,
251 },
252 {
253 .name = "ipv6-frag",
254 .pkt.ipv6_frag = {
255 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
256 .iph.nexthdr = IPPROTO_FRAGMENT,
257 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
258 .ipf.nexthdr = IPPROTO_TCP,
259 .tcp.doff = 5,
260 .tcp.source = 80,
261 .tcp.dest = 8080,
262 },
263 .keys = {
264 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
265 .nhoff = ETH_HLEN,
266 .thoff = ETH_HLEN + sizeof(struct ipv6hdr) +
267 sizeof(struct frag_hdr),
268 .addr_proto = ETH_P_IPV6,
269 .ip_proto = IPPROTO_TCP,
270 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
271 .is_frag = true,
272 .is_first_frag = true,
273 .sport = 80,
274 .dport = 8080,
275 },
276 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
277 .retval = BPF_OK,
278 },
279 {
280 .name = "ipv6-no-frag",
281 .pkt.ipv6_frag = {
282 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
283 .iph.nexthdr = IPPROTO_FRAGMENT,
284 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
285 .ipf.nexthdr = IPPROTO_TCP,
286 .tcp.doff = 5,
287 .tcp.source = 80,
288 .tcp.dest = 8080,
289 },
290 .keys = {
291 .nhoff = ETH_HLEN,
292 .thoff = ETH_HLEN + sizeof(struct ipv6hdr) +
293 sizeof(struct frag_hdr),
294 .addr_proto = ETH_P_IPV6,
295 .ip_proto = IPPROTO_TCP,
296 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
297 .is_frag = true,
298 .is_first_frag = true,
299 },
300 .retval = BPF_OK,
301 },
302 {
303 .name = "ipv6-flow-label",
304 .pkt.ipv6 = {
305 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
306 .iph.nexthdr = IPPROTO_TCP,
307 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
308 .iph.flow_lbl = { 0xb, 0xee, 0xef },
309 .tcp.doff = 5,
310 .tcp.source = 80,
311 .tcp.dest = 8080,
312 },
313 .keys = {
314 .nhoff = ETH_HLEN,
315 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
316 .addr_proto = ETH_P_IPV6,
317 .ip_proto = IPPROTO_TCP,
318 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
319 .sport = 80,
320 .dport = 8080,
321 .flow_label = __bpf_constant_htonl(0xbeeef),
322 },
323 .retval = BPF_OK,
324 },
325 {
326 .name = "ipv6-no-flow-label",
327 .pkt.ipv6 = {
328 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
329 .iph.nexthdr = IPPROTO_TCP,
330 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
331 .iph.flow_lbl = { 0xb, 0xee, 0xef },
332 .tcp.doff = 5,
333 .tcp.source = 80,
334 .tcp.dest = 8080,
335 },
336 .keys = {
337 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
338 .nhoff = ETH_HLEN,
339 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
340 .addr_proto = ETH_P_IPV6,
341 .ip_proto = IPPROTO_TCP,
342 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
343 .flow_label = __bpf_constant_htonl(0xbeeef),
344 },
345 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
346 .retval = BPF_OK,
347 },
348 {
349 .name = "ipip-encap",
350 .pkt.ipip = {
351 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
352 .iph.ihl = 5,
353 .iph.protocol = IPPROTO_IPIP,
354 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
355 .iph_inner.ihl = 5,
356 .iph_inner.protocol = IPPROTO_TCP,
357 .iph_inner.tot_len =
358 __bpf_constant_htons(MAGIC_BYTES) -
359 sizeof(struct iphdr),
360 .tcp.doff = 5,
361 .tcp.source = 80,
362 .tcp.dest = 8080,
363 },
364 .keys = {
365 .nhoff = ETH_HLEN,
366 .thoff = ETH_HLEN + sizeof(struct iphdr) +
367 sizeof(struct iphdr),
368 .addr_proto = ETH_P_IP,
369 .ip_proto = IPPROTO_TCP,
370 .n_proto = __bpf_constant_htons(ETH_P_IP),
371 .is_encap = true,
372 .sport = 80,
373 .dport = 8080,
374 },
375 .retval = BPF_OK,
376 },
377 {
378 .name = "ipip-no-encap",
379 .pkt.ipip = {
380 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
381 .iph.ihl = 5,
382 .iph.protocol = IPPROTO_IPIP,
383 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
384 .iph_inner.ihl = 5,
385 .iph_inner.protocol = IPPROTO_TCP,
386 .iph_inner.tot_len =
387 __bpf_constant_htons(MAGIC_BYTES) -
388 sizeof(struct iphdr),
389 .tcp.doff = 5,
390 .tcp.source = 80,
391 .tcp.dest = 8080,
392 },
393 .keys = {
394 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP,
395 .nhoff = ETH_HLEN,
396 .thoff = ETH_HLEN + sizeof(struct iphdr),
397 .addr_proto = ETH_P_IP,
398 .ip_proto = IPPROTO_IPIP,
399 .n_proto = __bpf_constant_htons(ETH_P_IP),
400 .is_encap = true,
401 },
402 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP,
403 .retval = BPF_OK,
404 },
405 {
406 .name = "ipip-encap-dissector-continue",
407 .pkt.ipip = {
408 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
409 .iph.ihl = 5,
410 .iph.protocol = IPPROTO_IPIP,
411 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
412 .iph.saddr = __bpf_constant_htonl(FLOW_CONTINUE_SADDR),
413 .iph_inner.ihl = 5,
414 .iph_inner.protocol = IPPROTO_TCP,
415 .iph_inner.tot_len =
416 __bpf_constant_htons(MAGIC_BYTES) -
417 sizeof(struct iphdr),
418 .tcp.doff = 5,
419 .tcp.source = 99,
420 .tcp.dest = 9090,
421 },
422 .retval = BPF_FLOW_DISSECTOR_CONTINUE,
423 },
424};
425
426static int create_tap(const char *ifname)
427{
428 struct ifreq ifr = {
429 .ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS,
430 };
431 int fd, ret;
432
433 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
434
435 fd = open("/dev/net/tun", O_RDWR);
436 if (fd < 0)
437 return -1;
438
439 ret = ioctl(fd, TUNSETIFF, &ifr);
440 if (ret)
441 return -1;
442
443 return fd;
444}
445
446static int tx_tap(int fd, void *pkt, size_t len)
447{
448 struct iovec iov[] = {
449 {
450 .iov_len = len,
451 .iov_base = pkt,
452 },
453 };
454 return writev(fd, iov, ARRAY_SIZE(iov));
455}
456
457static int ifup(const char *ifname)
458{
459 struct ifreq ifr = {};
460 int sk, ret;
461
462 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
463
464 sk = socket(PF_INET, SOCK_DGRAM, 0);
465 if (sk < 0)
466 return -1;
467
468 ret = ioctl(sk, SIOCGIFFLAGS, &ifr);
469 if (ret) {
470 close(sk);
471 return -1;
472 }
473
474 ifr.ifr_flags |= IFF_UP;
475 ret = ioctl(sk, SIOCSIFFLAGS, &ifr);
476 if (ret) {
477 close(sk);
478 return -1;
479 }
480
481 close(sk);
482 return 0;
483}
484
485static int init_prog_array(struct bpf_object *obj, struct bpf_map *prog_array)
486{
487 int i, err, map_fd, prog_fd;
488 struct bpf_program *prog;
489 char prog_name[32];
490
491 map_fd = bpf_map__fd(prog_array);
492 if (map_fd < 0)
493 return -1;
494
495 for (i = 0; i < bpf_map__max_entries(prog_array); i++) {
496 snprintf(prog_name, sizeof(prog_name), "flow_dissector_%d", i);
497
498 prog = bpf_object__find_program_by_name(obj, prog_name);
499 if (!prog)
500 return -1;
501
502 prog_fd = bpf_program__fd(prog);
503 if (prog_fd < 0)
504 return -1;
505
506 err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
507 if (err)
508 return -1;
509 }
510 return 0;
511}
512
513static void run_tests_skb_less(int tap_fd, struct bpf_map *keys)
514{
515 int i, err, keys_fd;
516
517 keys_fd = bpf_map__fd(keys);
518 if (CHECK(keys_fd < 0, "bpf_map__fd", "err %d\n", keys_fd))
519 return;
520
521 for (i = 0; i < ARRAY_SIZE(tests); i++) {
522 /* Keep in sync with 'flags' from eth_get_headlen. */
523 __u32 eth_get_headlen_flags =
524 BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
525 LIBBPF_OPTS(bpf_test_run_opts, topts);
526 struct bpf_flow_keys flow_keys = {};
527 __u32 key = (__u32)(tests[i].keys.sport) << 16 |
528 tests[i].keys.dport;
529
530 /* For skb-less case we can't pass input flags; run
531 * only the tests that have a matching set of flags.
532 */
533
534 if (tests[i].flags != eth_get_headlen_flags)
535 continue;
536
537 err = tx_tap(tap_fd, &tests[i].pkt, sizeof(tests[i].pkt));
538 CHECK(err < 0, "tx_tap", "err %d errno %d\n", err, errno);
539
540 /* check the stored flow_keys only if BPF_OK expected */
541 if (tests[i].retval != BPF_OK)
542 continue;
543
544 err = bpf_map_lookup_elem(keys_fd, &key, &flow_keys);
545 ASSERT_OK(err, "bpf_map_lookup_elem");
546
547 CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
548
549 err = bpf_map_delete_elem(keys_fd, &key);
550 ASSERT_OK(err, "bpf_map_delete_elem");
551 }
552}
553
554static void test_skb_less_prog_attach(struct bpf_flow *skel, int tap_fd)
555{
556 int err, prog_fd;
557
558 prog_fd = bpf_program__fd(skel->progs._dissect);
559 if (CHECK(prog_fd < 0, "bpf_program__fd", "err %d\n", prog_fd))
560 return;
561
562 err = bpf_prog_attach(prog_fd, 0, BPF_FLOW_DISSECTOR, 0);
563 if (CHECK(err, "bpf_prog_attach", "err %d errno %d\n", err, errno))
564 return;
565
566 run_tests_skb_less(tap_fd, skel->maps.last_dissection);
567
568 err = bpf_prog_detach2(prog_fd, 0, BPF_FLOW_DISSECTOR);
569 CHECK(err, "bpf_prog_detach2", "err %d errno %d\n", err, errno);
570}
571
572static void test_skb_less_link_create(struct bpf_flow *skel, int tap_fd)
573{
574 struct bpf_link *link;
575 int err, net_fd;
576
577 net_fd = open("/proc/self/ns/net", O_RDONLY);
578 if (CHECK(net_fd < 0, "open(/proc/self/ns/net)", "err %d\n", errno))
579 return;
580
581 link = bpf_program__attach_netns(skel->progs._dissect, net_fd);
582 if (!ASSERT_OK_PTR(link, "attach_netns"))
583 goto out_close;
584
585 run_tests_skb_less(tap_fd, skel->maps.last_dissection);
586
587 err = bpf_link__destroy(link);
588 CHECK(err, "bpf_link__destroy", "err %d\n", err);
589out_close:
590 close(net_fd);
591}
592
593void test_flow_dissector(void)
594{
595 int i, err, prog_fd, keys_fd = -1, tap_fd;
596 struct bpf_flow *skel;
597
598 skel = bpf_flow__open_and_load();
599 if (CHECK(!skel, "skel", "failed to open/load skeleton\n"))
600 return;
601
602 prog_fd = bpf_program__fd(skel->progs._dissect);
603 if (CHECK(prog_fd < 0, "bpf_program__fd", "err %d\n", prog_fd))
604 goto out_destroy_skel;
605 keys_fd = bpf_map__fd(skel->maps.last_dissection);
606 if (CHECK(keys_fd < 0, "bpf_map__fd", "err %d\n", keys_fd))
607 goto out_destroy_skel;
608 err = init_prog_array(skel->obj, skel->maps.jmp_table);
609 if (CHECK(err, "init_prog_array", "err %d\n", err))
610 goto out_destroy_skel;
611
612 for (i = 0; i < ARRAY_SIZE(tests); i++) {
613 struct bpf_flow_keys flow_keys;
614 LIBBPF_OPTS(bpf_test_run_opts, topts,
615 .data_in = &tests[i].pkt,
616 .data_size_in = sizeof(tests[i].pkt),
617 .data_out = &flow_keys,
618 );
619 static struct bpf_flow_keys ctx = {};
620
621 if (tests[i].flags) {
622 topts.ctx_in = &ctx;
623 topts.ctx_size_in = sizeof(ctx);
624 ctx.flags = tests[i].flags;
625 }
626
627 err = bpf_prog_test_run_opts(prog_fd, &topts);
628 ASSERT_OK(err, "test_run");
629 ASSERT_EQ(topts.retval, tests[i].retval, "test_run retval");
630
631 /* check the resulting flow_keys only if BPF_OK returned */
632 if (topts.retval != BPF_OK)
633 continue;
634 ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
635 "test_run data_size_out");
636 CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
637 }
638
639 /* Do the same tests but for skb-less flow dissector.
640 * We use a known path in the net/tun driver that calls
641 * eth_get_headlen and we manually export bpf_flow_keys
642 * via BPF map in this case.
643 */
644
645 tap_fd = create_tap("tap0");
646 CHECK(tap_fd < 0, "create_tap", "tap_fd %d errno %d\n", tap_fd, errno);
647 err = ifup("tap0");
648 CHECK(err, "ifup", "err %d errno %d\n", err, errno);
649
650 /* Test direct prog attachment */
651 test_skb_less_prog_attach(skel, tap_fd);
652 /* Test indirect prog attachment via link */
653 test_skb_less_link_create(skel, tap_fd);
654
655 close(tap_fd);
656out_destroy_skel:
657 bpf_flow__destroy(skel);
658}