1 // SPDX-License-Identifier: GPL-2.0
2 #define _GNU_SOURCE
3 #include <test_progs.h>
4 #include <network_helpers.h>
5 #include <linux/if_tun.h>
6 #include <sys/uio.h>
7
8 #include "bpf_flow.skel.h"
9
10 #define FLOW_CONTINUE_SADDR 0x7f00007f /* 127.0.0.127 */
11
12 #ifndef IP_MF
13 #define IP_MF 0x2000
14 #endif
15
16 #define CHECK_FLOW_KEYS(desc, got, expected) \
17 _CHECK(memcmp(&got, &expected, sizeof(got)) != 0, \
18 desc, \
19 topts.duration, \
20 "nhoff=%u/%u " \
21 "thoff=%u/%u " \
22 "addr_proto=0x%x/0x%x " \
23 "is_frag=%u/%u " \
24 "is_first_frag=%u/%u " \
25 "is_encap=%u/%u " \
26 "ip_proto=0x%x/0x%x " \
27 "n_proto=0x%x/0x%x " \
28 "flow_label=0x%x/0x%x " \
29 "sport=%u/%u " \
30 "dport=%u/%u\n", \
31 got.nhoff, expected.nhoff, \
32 got.thoff, expected.thoff, \
33 got.addr_proto, expected.addr_proto, \
34 got.is_frag, expected.is_frag, \
35 got.is_first_frag, expected.is_first_frag, \
36 got.is_encap, expected.is_encap, \
37 got.ip_proto, expected.ip_proto, \
38 got.n_proto, expected.n_proto, \
39 got.flow_label, expected.flow_label, \
40 got.sport, expected.sport, \
41 got.dport, expected.dport)
42
43 struct ipv4_pkt {
44 struct ethhdr eth;
45 struct iphdr iph;
46 struct tcphdr tcp;
47 } __packed;
48
49 struct ipip_pkt {
50 struct ethhdr eth;
51 struct iphdr iph;
52 struct iphdr iph_inner;
53 struct tcphdr tcp;
54 } __packed;
55
56 struct svlan_ipv4_pkt {
57 struct ethhdr eth;
58 __u16 vlan_tci;
59 __u16 vlan_proto;
60 struct iphdr iph;
61 struct tcphdr tcp;
62 } __packed;
63
64 struct ipv6_pkt {
65 struct ethhdr eth;
66 struct ipv6hdr iph;
67 struct tcphdr tcp;
68 } __packed;
69
70 struct ipv6_frag_pkt {
71 struct ethhdr eth;
72 struct ipv6hdr iph;
73 struct frag_hdr {
74 __u8 nexthdr;
75 __u8 reserved;
76 __be16 frag_off;
77 __be32 identification;
78 } ipf;
79 struct tcphdr tcp;
80 } __packed;
81
82 struct dvlan_ipv6_pkt {
83 struct ethhdr eth;
84 __u16 vlan_tci;
85 __u16 vlan_proto;
86 __u16 vlan_tci2;
87 __u16 vlan_proto2;
88 struct ipv6hdr iph;
89 struct tcphdr tcp;
90 } __packed;
91
92 struct test {
93 const char *name;
94 union {
95 struct ipv4_pkt ipv4;
96 struct svlan_ipv4_pkt svlan_ipv4;
97 struct ipip_pkt ipip;
98 struct ipv6_pkt ipv6;
99 struct ipv6_frag_pkt ipv6_frag;
100 struct dvlan_ipv6_pkt dvlan_ipv6;
101 } pkt;
102 struct bpf_flow_keys keys;
103 __u32 flags;
104 __u32 retval;
105 };
106
107 #define VLAN_HLEN 4
108
109 static __u32 duration;
110 struct test tests[] = {
111 {
112 .name = "ipv4",
113 .pkt.ipv4 = {
114 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
115 .iph.ihl = 5,
116 .iph.protocol = IPPROTO_TCP,
117 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
118 .tcp.doff = 5,
119 .tcp.source = 80,
120 .tcp.dest = 8080,
121 },
122 .keys = {
123 .nhoff = ETH_HLEN,
124 .thoff = ETH_HLEN + sizeof(struct iphdr),
125 .addr_proto = ETH_P_IP,
126 .ip_proto = IPPROTO_TCP,
127 .n_proto = __bpf_constant_htons(ETH_P_IP),
128 .sport = 80,
129 .dport = 8080,
130 },
131 .retval = BPF_OK,
132 },
133 {
134 .name = "ipv6",
135 .pkt.ipv6 = {
136 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
137 .iph.nexthdr = IPPROTO_TCP,
138 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
139 .tcp.doff = 5,
140 .tcp.source = 80,
141 .tcp.dest = 8080,
142 },
143 .keys = {
144 .nhoff = ETH_HLEN,
145 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
146 .addr_proto = ETH_P_IPV6,
147 .ip_proto = IPPROTO_TCP,
148 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
149 .sport = 80,
150 .dport = 8080,
151 },
152 .retval = BPF_OK,
153 },
154 {
155 .name = "802.1q-ipv4",
156 .pkt.svlan_ipv4 = {
157 .eth.h_proto = __bpf_constant_htons(ETH_P_8021Q),
158 .vlan_proto = __bpf_constant_htons(ETH_P_IP),
159 .iph.ihl = 5,
160 .iph.protocol = IPPROTO_TCP,
161 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
162 .tcp.doff = 5,
163 .tcp.source = 80,
164 .tcp.dest = 8080,
165 },
166 .keys = {
167 .nhoff = ETH_HLEN + VLAN_HLEN,
168 .thoff = ETH_HLEN + VLAN_HLEN + sizeof(struct iphdr),
169 .addr_proto = ETH_P_IP,
170 .ip_proto = IPPROTO_TCP,
171 .n_proto = __bpf_constant_htons(ETH_P_IP),
172 .sport = 80,
173 .dport = 8080,
174 },
175 .retval = BPF_OK,
176 },
177 {
178 .name = "802.1ad-ipv6",
179 .pkt.dvlan_ipv6 = {
180 .eth.h_proto = __bpf_constant_htons(ETH_P_8021AD),
181 .vlan_proto = __bpf_constant_htons(ETH_P_8021Q),
182 .vlan_proto2 = __bpf_constant_htons(ETH_P_IPV6),
183 .iph.nexthdr = IPPROTO_TCP,
184 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
185 .tcp.doff = 5,
186 .tcp.source = 80,
187 .tcp.dest = 8080,
188 },
189 .keys = {
190 .nhoff = ETH_HLEN + VLAN_HLEN * 2,
191 .thoff = ETH_HLEN + VLAN_HLEN * 2 +
192 sizeof(struct ipv6hdr),
193 .addr_proto = ETH_P_IPV6,
194 .ip_proto = IPPROTO_TCP,
195 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
196 .sport = 80,
197 .dport = 8080,
198 },
199 .retval = BPF_OK,
200 },
201 {
202 .name = "ipv4-frag",
203 .pkt.ipv4 = {
204 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
205 .iph.ihl = 5,
206 .iph.protocol = IPPROTO_TCP,
207 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
208 .iph.frag_off = __bpf_constant_htons(IP_MF),
209 .tcp.doff = 5,
210 .tcp.source = 80,
211 .tcp.dest = 8080,
212 },
213 .keys = {
214 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
215 .nhoff = ETH_HLEN,
216 .thoff = ETH_HLEN + sizeof(struct iphdr),
217 .addr_proto = ETH_P_IP,
218 .ip_proto = IPPROTO_TCP,
219 .n_proto = __bpf_constant_htons(ETH_P_IP),
220 .is_frag = true,
221 .is_first_frag = true,
222 .sport = 80,
223 .dport = 8080,
224 },
225 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
226 .retval = BPF_OK,
227 },
228 {
229 .name = "ipv4-no-frag",
230 .pkt.ipv4 = {
231 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
232 .iph.ihl = 5,
233 .iph.protocol = IPPROTO_TCP,
234 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
235 .iph.frag_off = __bpf_constant_htons(IP_MF),
236 .tcp.doff = 5,
237 .tcp.source = 80,
238 .tcp.dest = 8080,
239 },
240 .keys = {
241 .nhoff = ETH_HLEN,
242 .thoff = ETH_HLEN + sizeof(struct iphdr),
243 .addr_proto = ETH_P_IP,
244 .ip_proto = IPPROTO_TCP,
245 .n_proto = __bpf_constant_htons(ETH_P_IP),
246 .is_frag = true,
247 .is_first_frag = true,
248 },
249 .retval = BPF_OK,
250 },
251 {
252 .name = "ipv6-frag",
253 .pkt.ipv6_frag = {
254 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
255 .iph.nexthdr = IPPROTO_FRAGMENT,
256 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
257 .ipf.nexthdr = IPPROTO_TCP,
258 .tcp.doff = 5,
259 .tcp.source = 80,
260 .tcp.dest = 8080,
261 },
262 .keys = {
263 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
264 .nhoff = ETH_HLEN,
265 .thoff = ETH_HLEN + sizeof(struct ipv6hdr) +
266 sizeof(struct frag_hdr),
267 .addr_proto = ETH_P_IPV6,
268 .ip_proto = IPPROTO_TCP,
269 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
270 .is_frag = true,
271 .is_first_frag = true,
272 .sport = 80,
273 .dport = 8080,
274 },
275 .flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
276 .retval = BPF_OK,
277 },
278 {
279 .name = "ipv6-no-frag",
280 .pkt.ipv6_frag = {
281 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
282 .iph.nexthdr = IPPROTO_FRAGMENT,
283 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
284 .ipf.nexthdr = IPPROTO_TCP,
285 .tcp.doff = 5,
286 .tcp.source = 80,
287 .tcp.dest = 8080,
288 },
289 .keys = {
290 .nhoff = ETH_HLEN,
291 .thoff = ETH_HLEN + sizeof(struct ipv6hdr) +
292 sizeof(struct frag_hdr),
293 .addr_proto = ETH_P_IPV6,
294 .ip_proto = IPPROTO_TCP,
295 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
296 .is_frag = true,
297 .is_first_frag = true,
298 },
299 .retval = BPF_OK,
300 },
301 {
302 .name = "ipv6-flow-label",
303 .pkt.ipv6 = {
304 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
305 .iph.nexthdr = IPPROTO_TCP,
306 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
307 .iph.flow_lbl = { 0xb, 0xee, 0xef },
308 .tcp.doff = 5,
309 .tcp.source = 80,
310 .tcp.dest = 8080,
311 },
312 .keys = {
313 .nhoff = ETH_HLEN,
314 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
315 .addr_proto = ETH_P_IPV6,
316 .ip_proto = IPPROTO_TCP,
317 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
318 .sport = 80,
319 .dport = 8080,
320 .flow_label = __bpf_constant_htonl(0xbeeef),
321 },
322 .retval = BPF_OK,
323 },
324 {
325 .name = "ipv6-no-flow-label",
326 .pkt.ipv6 = {
327 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
328 .iph.nexthdr = IPPROTO_TCP,
329 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
330 .iph.flow_lbl = { 0xb, 0xee, 0xef },
331 .tcp.doff = 5,
332 .tcp.source = 80,
333 .tcp.dest = 8080,
334 },
335 .keys = {
336 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
337 .nhoff = ETH_HLEN,
338 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
339 .addr_proto = ETH_P_IPV6,
340 .ip_proto = IPPROTO_TCP,
341 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
342 .flow_label = __bpf_constant_htonl(0xbeeef),
343 },
344 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
345 .retval = BPF_OK,
346 },
347 {
348 .name = "ipv6-empty-flow-label",
349 .pkt.ipv6 = {
350 .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
351 .iph.nexthdr = IPPROTO_TCP,
352 .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
353 .iph.flow_lbl = { 0x00, 0x00, 0x00 },
354 .tcp.doff = 5,
355 .tcp.source = 80,
356 .tcp.dest = 8080,
357 },
358 .keys = {
359 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
360 .nhoff = ETH_HLEN,
361 .thoff = ETH_HLEN + sizeof(struct ipv6hdr),
362 .addr_proto = ETH_P_IPV6,
363 .ip_proto = IPPROTO_TCP,
364 .n_proto = __bpf_constant_htons(ETH_P_IPV6),
365 .sport = 80,
366 .dport = 8080,
367 },
368 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
369 .retval = BPF_OK,
370 },
371 {
372 .name = "ipip-encap",
373 .pkt.ipip = {
374 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
375 .iph.ihl = 5,
376 .iph.protocol = IPPROTO_IPIP,
377 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
378 .iph_inner.ihl = 5,
379 .iph_inner.protocol = IPPROTO_TCP,
380 .iph_inner.tot_len =
381 __bpf_constant_htons(MAGIC_BYTES) -
382 sizeof(struct iphdr),
383 .tcp.doff = 5,
384 .tcp.source = 80,
385 .tcp.dest = 8080,
386 },
387 .keys = {
388 .nhoff = ETH_HLEN,
389 .thoff = ETH_HLEN + sizeof(struct iphdr) +
390 sizeof(struct iphdr),
391 .addr_proto = ETH_P_IP,
392 .ip_proto = IPPROTO_TCP,
393 .n_proto = __bpf_constant_htons(ETH_P_IP),
394 .is_encap = true,
395 .sport = 80,
396 .dport = 8080,
397 },
398 .retval = BPF_OK,
399 },
400 {
401 .name = "ipip-no-encap",
402 .pkt.ipip = {
403 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
404 .iph.ihl = 5,
405 .iph.protocol = IPPROTO_IPIP,
406 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
407 .iph_inner.ihl = 5,
408 .iph_inner.protocol = IPPROTO_TCP,
409 .iph_inner.tot_len =
410 __bpf_constant_htons(MAGIC_BYTES) -
411 sizeof(struct iphdr),
412 .tcp.doff = 5,
413 .tcp.source = 80,
414 .tcp.dest = 8080,
415 },
416 .keys = {
417 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP,
418 .nhoff = ETH_HLEN,
419 .thoff = ETH_HLEN + sizeof(struct iphdr),
420 .addr_proto = ETH_P_IP,
421 .ip_proto = IPPROTO_IPIP,
422 .n_proto = __bpf_constant_htons(ETH_P_IP),
423 .is_encap = true,
424 },
425 .flags = BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP,
426 .retval = BPF_OK,
427 },
428 {
429 .name = "ipip-encap-dissector-continue",
430 .pkt.ipip = {
431 .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
432 .iph.ihl = 5,
433 .iph.protocol = IPPROTO_IPIP,
434 .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
435 .iph.saddr = __bpf_constant_htonl(FLOW_CONTINUE_SADDR),
436 .iph_inner.ihl = 5,
437 .iph_inner.protocol = IPPROTO_TCP,
438 .iph_inner.tot_len =
439 __bpf_constant_htons(MAGIC_BYTES) -
440 sizeof(struct iphdr),
441 .tcp.doff = 5,
442 .tcp.source = 99,
443 .tcp.dest = 9090,
444 },
445 .retval = BPF_FLOW_DISSECTOR_CONTINUE,
446 },
447 };
448
449 static int create_tap(const char *ifname)
450 {
451 struct ifreq ifr = {
452 .ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS,
453 };
454 int fd, ret;
455
456 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
457
458 fd = open("/dev/net/tun", O_RDWR);
459 if (fd < 0)
460 return -1;
461
462 ret = ioctl(fd, TUNSETIFF, &ifr);
463 if (ret)
464 return -1;
465
466 return fd;
467 }
468
469 static int tx_tap(int fd, void *pkt, size_t len)
470 {
471 struct iovec iov[] = {
472 {
473 .iov_len = len,
474 .iov_base = pkt,
475 },
476 };
477 return writev(fd, iov, ARRAY_SIZE(iov));
478 }
479
480 static int ifup(const char *ifname)
481 {
482 struct ifreq ifr = {};
483 int sk, ret;
484
485 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
486
487 sk = socket(PF_INET, SOCK_DGRAM, 0);
488 if (sk < 0)
489 return -1;
490
491 ret = ioctl(sk, SIOCGIFFLAGS, &ifr);
492 if (ret) {
493 close(sk);
494 return -1;
495 }
496
497 ifr.ifr_flags |= IFF_UP;
498 ret = ioctl(sk, SIOCSIFFLAGS, &ifr);
499 if (ret) {
500 close(sk);
501 return -1;
502 }
503
504 close(sk);
505 return 0;
506 }
507
508 static int init_prog_array(struct bpf_object *obj, struct bpf_map *prog_array)
509 {
510 int i, err, map_fd, prog_fd;
511 struct bpf_program *prog;
512 char prog_name[32];
513
514 map_fd = bpf_map__fd(prog_array);
515 if (map_fd < 0)
516 return -1;
517
518 for (i = 0; i < bpf_map__max_entries(prog_array); i++) {
519 snprintf(prog_name, sizeof(prog_name), "flow_dissector_%d", i);
520
521 prog = bpf_object__find_program_by_name(obj, prog_name);
522 if (!prog)
523 return -1;
524
525 prog_fd = bpf_program__fd(prog);
526 if (prog_fd < 0)
527 return -1;
528
529 err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
530 if (err)
531 return -1;
532 }
533 return 0;
534 }
535
536 static void run_tests_skb_less(int tap_fd, struct bpf_map *keys)
537 {
538 int i, err, keys_fd;
539
540 keys_fd = bpf_map__fd(keys);
541 if (CHECK(keys_fd < 0, "bpf_map__fd", "err %d\n", keys_fd))
542 return;
543
544 for (i = 0; i < ARRAY_SIZE(tests); i++) {
545 /* Keep in sync with 'flags' from eth_get_headlen. */
546 __u32 eth_get_headlen_flags =
547 BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
548 LIBBPF_OPTS(bpf_test_run_opts, topts);
549 struct bpf_flow_keys flow_keys = {};
550 __u32 key = (__u32)(tests[i].keys.sport) << 16 |
551 tests[i].keys.dport;
552
553 /* For skb-less case we can't pass input flags; run
554 * only the tests that have a matching set of flags.
555 */
556
557 if (tests[i].flags != eth_get_headlen_flags)
558 continue;
559
560 err = tx_tap(tap_fd, &tests[i].pkt, sizeof(tests[i].pkt));
561 CHECK(err < 0, "tx_tap", "err %d errno %d\n", err, errno);
562
563 /* check the stored flow_keys only if BPF_OK expected */
564 if (tests[i].retval != BPF_OK)
565 continue;
566
567 err = bpf_map_lookup_elem(keys_fd, &key, &flow_keys);
568 ASSERT_OK(err, "bpf_map_lookup_elem");
569
570 CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
571
572 err = bpf_map_delete_elem(keys_fd, &key);
573 ASSERT_OK(err, "bpf_map_delete_elem");
574 }
575 }
576
577 static void test_skb_less_prog_attach(struct bpf_flow *skel, int tap_fd)
578 {
579 int err, prog_fd;
580
581 prog_fd = bpf_program__fd(skel->progs._dissect);
582 if (CHECK(prog_fd < 0, "bpf_program__fd", "err %d\n", prog_fd))
583 return;
584
585 err = bpf_prog_attach(prog_fd, 0, BPF_FLOW_DISSECTOR, 0);
586 if (CHECK(err, "bpf_prog_attach", "err %d errno %d\n", err, errno))
587 return;
588
589 run_tests_skb_less(tap_fd, skel->maps.last_dissection);
590
591 err = bpf_prog_detach2(prog_fd, 0, BPF_FLOW_DISSECTOR);
592 CHECK(err, "bpf_prog_detach2", "err %d errno %d\n", err, errno);
593 }
594
595 static void test_skb_less_link_create(struct bpf_flow *skel, int tap_fd)
596 {
597 struct bpf_link *link;
598 int err, net_fd;
599
600 net_fd = open("/proc/self/ns/net", O_RDONLY);
601 if (CHECK(net_fd < 0, "open(/proc/self/ns/net)", "err %d\n", errno))
602 return;
603
604 link = bpf_program__attach_netns(skel->progs._dissect, net_fd);
605 if (!ASSERT_OK_PTR(link, "attach_netns"))
606 goto out_close;
607
608 run_tests_skb_less(tap_fd, skel->maps.last_dissection);
609
610 err = bpf_link__destroy(link);
611 CHECK(err, "bpf_link__destroy", "err %d\n", err);
612 out_close:
613 close(net_fd);
614 }
615
616 void test_flow_dissector(void)
617 {
618 int i, err, prog_fd, keys_fd = -1, tap_fd;
619 struct bpf_flow *skel;
620
621 skel = bpf_flow__open_and_load();
622 if (CHECK(!skel, "skel", "failed to open/load skeleton\n"))
623 return;
624
625 prog_fd = bpf_program__fd(skel->progs._dissect);
626 if (CHECK(prog_fd < 0, "bpf_program__fd", "err %d\n", prog_fd))
627 goto out_destroy_skel;
628 keys_fd = bpf_map__fd(skel->maps.last_dissection);
629 if (CHECK(keys_fd < 0, "bpf_map__fd", "err %d\n", keys_fd))
630 goto out_destroy_skel;
631 err = init_prog_array(skel->obj, skel->maps.jmp_table);
632 if (CHECK(err, "init_prog_array", "err %d\n", err))
633 goto out_destroy_skel;
634
635 for (i = 0; i < ARRAY_SIZE(tests); i++) {
636 struct bpf_flow_keys flow_keys;
637 LIBBPF_OPTS(bpf_test_run_opts, topts,
638 .data_in = &tests[i].pkt,
639 .data_size_in = sizeof(tests[i].pkt),
640 .data_out = &flow_keys,
641 );
642 static struct bpf_flow_keys ctx = {};
643
644 if (tests[i].flags) {
645 topts.ctx_in = &ctx;
646 topts.ctx_size_in = sizeof(ctx);
647 ctx.flags = tests[i].flags;
648 }
649
650 err = bpf_prog_test_run_opts(prog_fd, &topts);
651 ASSERT_OK(err, "test_run");
652 ASSERT_EQ(topts.retval, tests[i].retval, "test_run retval");
653
654 /* check the resulting flow_keys only if BPF_OK returned */
655 if (topts.retval != BPF_OK)
656 continue;
657 ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
658 "test_run data_size_out");
659 CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
660 }
661
662 /* Do the same tests but for skb-less flow dissector.
663 * We use a known path in the net/tun driver that calls
664 * eth_get_headlen and we manually export bpf_flow_keys
665 * via BPF map in this case.
666 */
667
668 tap_fd = create_tap("tap0");
669 CHECK(tap_fd < 0, "create_tap", "tap_fd %d errno %d\n", tap_fd, errno);
670 err = ifup("tap0");
671 CHECK(err, "ifup", "err %d errno %d\n", err, errno);
672
673 /* Test direct prog attachment */
674 test_skb_less_prog_attach(skel, tap_fd);
675 /* Test indirect prog attachment via link */
676 test_skb_less_link_create(skel, tap_fd);
677
678 close(tap_fd);
679 out_destroy_skel:
680 bpf_flow__destroy(skel);
681 }
682
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