summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
blob: f76b5d67a3eefb7700fe3d8d7bb412824814f498 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
#include "xdp_metadata.skel.h"
#include "xdp_metadata2.skel.h"
#include "xdp_metadata.h"
#include "xsk.h"

#include <bpf/btf.h>
#include <linux/errqueue.h>
#include <linux/if_link.h>
#include <linux/net_tstamp.h>
#include <linux/udp.h>
#include <sys/mman.h>
#include <net/if.h>
#include <poll.h>

#define TX_NAME "veTX"
#define RX_NAME "veRX"

#define UDP_PAYLOAD_BYTES 4

#define UDP_SOURCE_PORT 1234
#define AF_XDP_CONSUMER_PORT 8080

#define UMEM_NUM 16
#define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
#define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM)
#define XDP_FLAGS XDP_FLAGS_DRV_MODE
#define QUEUE_ID 0

#define TX_ADDR "10.0.0.1"
#define RX_ADDR "10.0.0.2"
#define PREFIX_LEN "8"
#define FAMILY AF_INET
#define TX_NETNS_NAME "xdp_metadata_tx"
#define RX_NETNS_NAME "xdp_metadata_rx"
#define TX_MAC "00:00:00:00:00:01"
#define RX_MAC "00:00:00:00:00:02"

#define VLAN_ID 59
#define VLAN_PROTO "802.1Q"
#define VLAN_PID htons(ETH_P_8021Q)
#define TX_NAME_VLAN TX_NAME "." TO_STR(VLAN_ID)

#define XDP_RSS_TYPE_L4 BIT(3)
#define VLAN_VID_MASK 0xfff

struct xsk {
	void *umem_area;
	struct xsk_umem *umem;
	struct xsk_ring_prod fill;
	struct xsk_ring_cons comp;
	struct xsk_ring_prod tx;
	struct xsk_ring_cons rx;
	struct xsk_socket *socket;
};

static int open_xsk(int ifindex, struct xsk *xsk)
{
	int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
	const struct xsk_socket_config socket_config = {
		.rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
		.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
		.bind_flags = XDP_COPY,
	};
	const struct xsk_umem_config umem_config = {
		.fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
		.comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
		.frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
		.flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG | XDP_UMEM_TX_SW_CSUM,
		.tx_metadata_len = sizeof(struct xsk_tx_metadata),
	};
	__u32 idx;
	u64 addr;
	int ret;
	int i;

	xsk->umem_area = mmap(NULL, UMEM_SIZE, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
	if (!ASSERT_NEQ(xsk->umem_area, MAP_FAILED, "mmap"))
		return -1;

	ret = xsk_umem__create(&xsk->umem,
			       xsk->umem_area, UMEM_SIZE,
			       &xsk->fill,
			       &xsk->comp,
			       &umem_config);
	if (!ASSERT_OK(ret, "xsk_umem__create"))
		return ret;

	ret = xsk_socket__create(&xsk->socket, ifindex, QUEUE_ID,
				 xsk->umem,
				 &xsk->rx,
				 &xsk->tx,
				 &socket_config);
	if (!ASSERT_OK(ret, "xsk_socket__create"))
		return ret;

	/* First half of umem is for TX. This way address matches 1-to-1
	 * to the completion queue index.
	 */

	for (i = 0; i < UMEM_NUM / 2; i++) {
		addr = i * UMEM_FRAME_SIZE;
		printf("%p: tx_desc[%d] -> %lx\n", xsk, i, addr);
	}

	/* Second half of umem is for RX. */

	ret = xsk_ring_prod__reserve(&xsk->fill, UMEM_NUM / 2, &idx);
	if (!ASSERT_EQ(UMEM_NUM / 2, ret, "xsk_ring_prod__reserve"))
		return ret;
	if (!ASSERT_EQ(idx, 0, "fill idx != 0"))
		return -1;

	for (i = 0; i < UMEM_NUM / 2; i++) {
		addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE;
		printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr);
		*xsk_ring_prod__fill_addr(&xsk->fill, i) = addr;
	}
	xsk_ring_prod__submit(&xsk->fill, ret);

	return 0;
}

static void close_xsk(struct xsk *xsk)
{
	if (xsk->umem)
		xsk_umem__delete(xsk->umem);
	if (xsk->socket)
		xsk_socket__delete(xsk->socket);
	munmap(xsk->umem_area, UMEM_SIZE);
}

static void ip_csum(struct iphdr *iph)
{
	__u32 sum = 0;
	__u16 *p;
	int i;

	iph->check = 0;
	p = (void *)iph;
	for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
		sum += p[i];

	while (sum >> 16)
		sum = (sum & 0xffff) + (sum >> 16);

	iph->check = ~sum;
}

static int generate_packet(struct xsk *xsk, __u16 dst_port)
{
	struct xsk_tx_metadata *meta;
	struct xdp_desc *tx_desc;
	struct udphdr *udph;
	struct ethhdr *eth;
	struct iphdr *iph;
	void *data;
	__u32 idx;
	int ret;

	ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
	if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
		return -1;

	tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
	tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE + sizeof(struct xsk_tx_metadata);
	printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
	data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);

	meta = data - sizeof(struct xsk_tx_metadata);
	memset(meta, 0, sizeof(*meta));
	meta->flags = XDP_TXMD_FLAGS_TIMESTAMP;

	eth = data;
	iph = (void *)(eth + 1);
	udph = (void *)(iph + 1);

	memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
	memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
	eth->h_proto = htons(ETH_P_IP);

	iph->version = 0x4;
	iph->ihl = 0x5;
	iph->tos = 0x9;
	iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
	iph->id = 0;
	iph->frag_off = 0;
	iph->ttl = 0;
	iph->protocol = IPPROTO_UDP;
	ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
	ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
	ip_csum(iph);

	udph->source = htons(UDP_SOURCE_PORT);
	udph->dest = htons(dst_port);
	udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
	udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
					 ntohs(udph->len), IPPROTO_UDP, 0);

	memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);

	meta->flags |= XDP_TXMD_FLAGS_CHECKSUM;
	meta->request.csum_start = sizeof(*eth) + sizeof(*iph);
	meta->request.csum_offset = offsetof(struct udphdr, check);

	tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
	tx_desc->options |= XDP_TX_METADATA;
	xsk_ring_prod__submit(&xsk->tx, 1);

	ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
	if (!ASSERT_GE(ret, 0, "sendto"))
		return ret;

	return 0;
}

static int generate_packet_inet(void)
{
	char udp_payload[UDP_PAYLOAD_BYTES];
	struct sockaddr_in rx_addr;
	int sock_fd, err = 0;

	/* Build a packet */
	memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
	rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
	rx_addr.sin_family = AF_INET;
	rx_addr.sin_port = htons(AF_XDP_CONSUMER_PORT);

	sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
		return sock_fd;

	err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
		     (void *)&rx_addr, sizeof(rx_addr));
	ASSERT_GE(err, 0, "sendto");

	close(sock_fd);
	return err;
}

static void complete_tx(struct xsk *xsk)
{
	struct xsk_tx_metadata *meta;
	__u64 addr;
	void *data;
	__u32 idx;

	if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
		addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);

		printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);

		data = xsk_umem__get_data(xsk->umem_area, addr);
		meta = data - sizeof(struct xsk_tx_metadata);

		ASSERT_NEQ(meta->completion.tx_timestamp, 0, "tx_timestamp");

		xsk_ring_cons__release(&xsk->comp, 1);
	}
}

static void refill_rx(struct xsk *xsk, __u64 addr)
{
	__u32 idx;

	if (ASSERT_EQ(xsk_ring_prod__reserve(&xsk->fill, 1, &idx), 1, "xsk_ring_prod__reserve")) {
		printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr);
		*xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr;
		xsk_ring_prod__submit(&xsk->fill, 1);
	}
}

static int verify_xsk_metadata(struct xsk *xsk, bool sent_from_af_xdp)
{
	const struct xdp_desc *rx_desc;
	struct pollfd fds = {};
	struct xdp_meta *meta;
	struct udphdr *udph;
	struct ethhdr *eth;
	struct iphdr *iph;
	__u64 comp_addr;
	void *data;
	__u64 addr;
	__u32 idx = 0;
	int ret;

	ret = recvfrom(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, NULL);
	if (!ASSERT_EQ(ret, 0, "recvfrom"))
		return -1;

	fds.fd = xsk_socket__fd(xsk->socket);
	fds.events = POLLIN;

	ret = poll(&fds, 1, 1000);
	if (!ASSERT_GT(ret, 0, "poll"))
		return -1;

	ret = xsk_ring_cons__peek(&xsk->rx, 1, &idx);
	if (!ASSERT_EQ(ret, 1, "xsk_ring_cons__peek"))
		return -2;

	rx_desc = xsk_ring_cons__rx_desc(&xsk->rx, idx);
	comp_addr = xsk_umem__extract_addr(rx_desc->addr);
	addr = xsk_umem__add_offset_to_addr(rx_desc->addr);
	printf("%p: rx_desc[%u]->addr=%llx addr=%llx comp_addr=%llx\n",
	       xsk, idx, rx_desc->addr, addr, comp_addr);
	data = xsk_umem__get_data(xsk->umem_area, addr);

	/* Make sure we got the packet offset correctly. */

	eth = data;
	ASSERT_EQ(eth->h_proto, htons(ETH_P_IP), "eth->h_proto");
	iph = (void *)(eth + 1);
	ASSERT_EQ((int)iph->version, 4, "iph->version");
	udph = (void *)(iph + 1);

	/* custom metadata */

	meta = data - sizeof(struct xdp_meta);

	if (!ASSERT_NEQ(meta->rx_timestamp, 0, "rx_timestamp"))
		return -1;

	if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
		return -1;

	if (!sent_from_af_xdp) {
		if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
			return -1;

		if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
			return -1;

		if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
			return -1;
		goto done;
	}

	ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");

	/* checksum offload */
	ASSERT_EQ(udph->check, htons(0x721c), "csum");

done:
	xsk_ring_cons__release(&xsk->rx, 1);
	refill_rx(xsk, comp_addr);

	return 0;
}

static void switch_ns_to_rx(struct nstoken **tok)
{
	close_netns(*tok);
	*tok = open_netns(RX_NETNS_NAME);
}

static void switch_ns_to_tx(struct nstoken **tok)
{
	close_netns(*tok);
	*tok = open_netns(TX_NETNS_NAME);
}

void test_xdp_metadata(void)
{
	struct xdp_metadata2 *bpf_obj2 = NULL;
	struct xdp_metadata *bpf_obj = NULL;
	struct bpf_program *new_prog, *prog;
	struct nstoken *tok = NULL;
	__u32 queue_id = QUEUE_ID;
	struct bpf_map *prog_arr;
	struct xsk tx_xsk = {};
	struct xsk rx_xsk = {};
	__u32 val, key = 0;
	int retries = 10;
	int rx_ifindex;
	int tx_ifindex;
	int sock_fd;
	int ret;

	/* Setup new networking namespaces, with a veth pair. */
	SYS(out, "ip netns add " TX_NETNS_NAME);
	SYS(out, "ip netns add " RX_NETNS_NAME);

	tok = open_netns(TX_NETNS_NAME);
	if (!ASSERT_OK_PTR(tok, "setns"))
		goto out;
	SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
	    " type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
	SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);

	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
	SYS(out, "ip link set dev " TX_NAME " up");

	SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
		 " type vlan proto " VLAN_PROTO " id " TO_STR(VLAN_ID));
	SYS(out, "ip link set dev " TX_NAME_VLAN " up");
	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);

	/* Avoid ARP calls */
	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);

	switch_ns_to_rx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns rx"))
		goto out;

	SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
	SYS(out, "ip link set dev " RX_NAME " up");
	SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);

	rx_ifindex = if_nametoindex(RX_NAME);

	/* Setup separate AF_XDP for RX interface. */

	ret = open_xsk(rx_ifindex, &rx_xsk);
	if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
		goto out;

	bpf_obj = xdp_metadata__open();
	if (!ASSERT_OK_PTR(bpf_obj, "open skeleton"))
		goto out;

	prog = bpf_object__find_program_by_name(bpf_obj->obj, "rx");
	bpf_program__set_ifindex(prog, rx_ifindex);
	bpf_program__set_flags(prog, BPF_F_XDP_DEV_BOUND_ONLY);

	if (!ASSERT_OK(xdp_metadata__load(bpf_obj), "load skeleton"))
		goto out;

	/* Make sure we can't add dev-bound programs to prog maps. */
	prog_arr = bpf_object__find_map_by_name(bpf_obj->obj, "prog_arr");
	if (!ASSERT_OK_PTR(prog_arr, "no prog_arr map"))
		goto out;

	val = bpf_program__fd(prog);
	if (!ASSERT_ERR(bpf_map__update_elem(prog_arr, &key, sizeof(key),
					     &val, sizeof(val), BPF_ANY),
			"update prog_arr"))
		goto out;

	/* Attach BPF program to RX interface. */

	ret = bpf_xdp_attach(rx_ifindex,
			     bpf_program__fd(bpf_obj->progs.rx),
			     XDP_FLAGS, NULL);
	if (!ASSERT_GE(ret, 0, "bpf_xdp_attach"))
		goto out;

	sock_fd = xsk_socket__fd(rx_xsk.socket);
	ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
	if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
		goto out;

	switch_ns_to_tx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns tx"))
		goto out;

	/* Setup separate AF_XDP for TX interface nad send packet to the RX socket. */
	tx_ifindex = if_nametoindex(TX_NAME);
	ret = open_xsk(tx_ifindex, &tx_xsk);
	if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
		goto out;

	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
		       "generate AF_XDP_CONSUMER_PORT"))
		goto out;

	switch_ns_to_rx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns rx"))
		goto out;

	/* Verify packet sent from AF_XDP has proper metadata. */
	if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, true), 0,
		       "verify_xsk_metadata"))
		goto out;

	switch_ns_to_tx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns tx"))
		goto out;
	complete_tx(&tx_xsk);

	/* Now check metadata of packet, generated with network stack */
	if (!ASSERT_GE(generate_packet_inet(), 0, "generate UDP packet"))
		goto out;

	switch_ns_to_rx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns rx"))
		goto out;

	if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, false), 0,
		       "verify_xsk_metadata"))
		goto out;

	/* Make sure freplace correctly picks up original bound device
	 * and doesn't crash.
	 */

	bpf_obj2 = xdp_metadata2__open();
	if (!ASSERT_OK_PTR(bpf_obj2, "open skeleton"))
		goto out;

	new_prog = bpf_object__find_program_by_name(bpf_obj2->obj, "freplace_rx");
	bpf_program__set_attach_target(new_prog, bpf_program__fd(prog), "rx");

	if (!ASSERT_OK(xdp_metadata2__load(bpf_obj2), "load freplace skeleton"))
		goto out;

	if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
		goto out;

	switch_ns_to_tx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns tx"))
		goto out;

	/* Send packet to trigger . */
	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
		       "generate freplace packet"))
		goto out;

	switch_ns_to_rx(&tok);
	if (!ASSERT_OK_PTR(tok, "setns rx"))
		goto out;

	while (!retries--) {
		if (bpf_obj2->bss->called)
			break;
		usleep(10);
	}
	ASSERT_GT(bpf_obj2->bss->called, 0, "not called");

out:
	close_xsk(&rx_xsk);
	close_xsk(&tx_xsk);
	xdp_metadata2__destroy(bpf_obj2);
	xdp_metadata__destroy(bpf_obj);
	if (tok)
		close_netns(tok);
	SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
	SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
}