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1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3#include <network_helpers.h>
4#include "xdp_metadata.skel.h"
5#include "xdp_metadata2.skel.h"
6#include "xdp_metadata.h"
7#include "xsk.h"
8
9#include <bpf/btf.h>
10#include <linux/errqueue.h>
11#include <linux/if_link.h>
12#include <linux/net_tstamp.h>
13#include <linux/udp.h>
14#include <sys/mman.h>
15#include <net/if.h>
16#include <poll.h>
17
18#define TX_NAME "veTX"
19#define RX_NAME "veRX"
20
21#define UDP_PAYLOAD_BYTES 4
22
23#define UDP_SOURCE_PORT 1234
24#define AF_XDP_CONSUMER_PORT 8080
25
26#define UMEM_NUM 16
27#define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
28#define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM)
29#define XDP_FLAGS XDP_FLAGS_DRV_MODE
30#define QUEUE_ID 0
31
32#define TX_ADDR "10.0.0.1"
33#define RX_ADDR "10.0.0.2"
34#define PREFIX_LEN "8"
35#define FAMILY AF_INET
36#define TX_NETNS_NAME "xdp_metadata_tx"
37#define RX_NETNS_NAME "xdp_metadata_rx"
38#define TX_MAC "00:00:00:00:00:01"
39#define RX_MAC "00:00:00:00:00:02"
40
41#define VLAN_ID 59
42#define VLAN_PROTO "802.1Q"
43#define VLAN_PID htons(ETH_P_8021Q)
44#define TX_NAME_VLAN TX_NAME "." TO_STR(VLAN_ID)
45
46#define XDP_RSS_TYPE_L4 BIT(3)
47#define VLAN_VID_MASK 0xfff
48
49struct xsk {
50 void *umem_area;
51 struct xsk_umem *umem;
52 struct xsk_ring_prod fill;
53 struct xsk_ring_cons comp;
54 struct xsk_ring_prod tx;
55 struct xsk_ring_cons rx;
56 struct xsk_socket *socket;
57};
58
59static int open_xsk(int ifindex, struct xsk *xsk)
60{
61 int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
62 const struct xsk_socket_config socket_config = {
63 .rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
64 .tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
65 .bind_flags = XDP_COPY,
66 };
67 const struct xsk_umem_config umem_config = {
68 .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
69 .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
70 .frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
71 .flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG | XDP_UMEM_TX_SW_CSUM |
72 XDP_UMEM_TX_METADATA_LEN,
73 .tx_metadata_len = sizeof(struct xsk_tx_metadata),
74 };
75 __u32 idx;
76 u64 addr;
77 int ret;
78 int i;
79
80 xsk->umem_area = mmap(NULL, UMEM_SIZE, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
81 if (!ASSERT_NEQ(xsk->umem_area, MAP_FAILED, "mmap"))
82 return -1;
83
84 ret = xsk_umem__create(&xsk->umem,
85 xsk->umem_area, UMEM_SIZE,
86 &xsk->fill,
87 &xsk->comp,
88 &umem_config);
89 if (!ASSERT_OK(ret, "xsk_umem__create"))
90 return ret;
91
92 ret = xsk_socket__create(&xsk->socket, ifindex, QUEUE_ID,
93 xsk->umem,
94 &xsk->rx,
95 &xsk->tx,
96 &socket_config);
97 if (!ASSERT_OK(ret, "xsk_socket__create"))
98 return ret;
99
100 /* First half of umem is for TX. This way address matches 1-to-1
101 * to the completion queue index.
102 */
103
104 for (i = 0; i < UMEM_NUM / 2; i++) {
105 addr = i * UMEM_FRAME_SIZE;
106 printf("%p: tx_desc[%d] -> %lx\n", xsk, i, addr);
107 }
108
109 /* Second half of umem is for RX. */
110
111 ret = xsk_ring_prod__reserve(&xsk->fill, UMEM_NUM / 2, &idx);
112 if (!ASSERT_EQ(UMEM_NUM / 2, ret, "xsk_ring_prod__reserve"))
113 return ret;
114 if (!ASSERT_EQ(idx, 0, "fill idx != 0"))
115 return -1;
116
117 for (i = 0; i < UMEM_NUM / 2; i++) {
118 addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE;
119 printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr);
120 *xsk_ring_prod__fill_addr(&xsk->fill, i) = addr;
121 }
122 xsk_ring_prod__submit(&xsk->fill, ret);
123
124 return 0;
125}
126
127static void close_xsk(struct xsk *xsk)
128{
129 if (xsk->umem)
130 xsk_umem__delete(xsk->umem);
131 if (xsk->socket)
132 xsk_socket__delete(xsk->socket);
133 munmap(xsk->umem_area, UMEM_SIZE);
134}
135
136static void ip_csum(struct iphdr *iph)
137{
138 __u32 sum = 0;
139 __u16 *p;
140 int i;
141
142 iph->check = 0;
143 p = (void *)iph;
144 for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
145 sum += p[i];
146
147 while (sum >> 16)
148 sum = (sum & 0xffff) + (sum >> 16);
149
150 iph->check = ~sum;
151}
152
153static int generate_packet(struct xsk *xsk, __u16 dst_port)
154{
155 struct xsk_tx_metadata *meta;
156 struct xdp_desc *tx_desc;
157 struct udphdr *udph;
158 struct ethhdr *eth;
159 struct iphdr *iph;
160 void *data;
161 __u32 idx;
162 int ret;
163
164 ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
165 if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
166 return -1;
167
168 tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
169 tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE + sizeof(struct xsk_tx_metadata);
170 printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
171 data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
172
173 meta = data - sizeof(struct xsk_tx_metadata);
174 memset(meta, 0, sizeof(*meta));
175 meta->flags = XDP_TXMD_FLAGS_TIMESTAMP;
176
177 eth = data;
178 iph = (void *)(eth + 1);
179 udph = (void *)(iph + 1);
180
181 memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
182 memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
183 eth->h_proto = htons(ETH_P_IP);
184
185 iph->version = 0x4;
186 iph->ihl = 0x5;
187 iph->tos = 0x9;
188 iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
189 iph->id = 0;
190 iph->frag_off = 0;
191 iph->ttl = 0;
192 iph->protocol = IPPROTO_UDP;
193 ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
194 ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
195 ip_csum(iph);
196
197 udph->source = htons(UDP_SOURCE_PORT);
198 udph->dest = htons(dst_port);
199 udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
200 udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
201 ntohs(udph->len), IPPROTO_UDP, 0);
202
203 memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
204
205 meta->flags |= XDP_TXMD_FLAGS_CHECKSUM;
206 meta->request.csum_start = sizeof(*eth) + sizeof(*iph);
207 meta->request.csum_offset = offsetof(struct udphdr, check);
208
209 tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
210 tx_desc->options |= XDP_TX_METADATA;
211 xsk_ring_prod__submit(&xsk->tx, 1);
212
213 ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
214 if (!ASSERT_GE(ret, 0, "sendto"))
215 return ret;
216
217 return 0;
218}
219
220static int generate_packet_inet(void)
221{
222 char udp_payload[UDP_PAYLOAD_BYTES];
223 struct sockaddr_in rx_addr;
224 int sock_fd, err = 0;
225
226 /* Build a packet */
227 memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
228 rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
229 rx_addr.sin_family = AF_INET;
230 rx_addr.sin_port = htons(AF_XDP_CONSUMER_PORT);
231
232 sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
233 if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
234 return sock_fd;
235
236 err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
237 (void *)&rx_addr, sizeof(rx_addr));
238 ASSERT_GE(err, 0, "sendto");
239
240 close(sock_fd);
241 return err;
242}
243
244static void complete_tx(struct xsk *xsk)
245{
246 struct xsk_tx_metadata *meta;
247 __u64 addr;
248 void *data;
249 __u32 idx;
250
251 if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
252 addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
253
254 printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
255
256 data = xsk_umem__get_data(xsk->umem_area, addr);
257 meta = data - sizeof(struct xsk_tx_metadata);
258
259 ASSERT_NEQ(meta->completion.tx_timestamp, 0, "tx_timestamp");
260
261 xsk_ring_cons__release(&xsk->comp, 1);
262 }
263}
264
265static void refill_rx(struct xsk *xsk, __u64 addr)
266{
267 __u32 idx;
268
269 if (ASSERT_EQ(xsk_ring_prod__reserve(&xsk->fill, 1, &idx), 1, "xsk_ring_prod__reserve")) {
270 printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr);
271 *xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr;
272 xsk_ring_prod__submit(&xsk->fill, 1);
273 }
274}
275
276static int verify_xsk_metadata(struct xsk *xsk, bool sent_from_af_xdp)
277{
278 const struct xdp_desc *rx_desc;
279 struct pollfd fds = {};
280 struct xdp_meta *meta;
281 struct udphdr *udph;
282 struct ethhdr *eth;
283 struct iphdr *iph;
284 __u64 comp_addr;
285 void *data;
286 __u64 addr;
287 __u32 idx = 0;
288 int ret;
289
290 ret = recvfrom(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, NULL);
291 if (!ASSERT_EQ(ret, 0, "recvfrom"))
292 return -1;
293
294 fds.fd = xsk_socket__fd(xsk->socket);
295 fds.events = POLLIN;
296
297 ret = poll(&fds, 1, 1000);
298 if (!ASSERT_GT(ret, 0, "poll"))
299 return -1;
300
301 ret = xsk_ring_cons__peek(&xsk->rx, 1, &idx);
302 if (!ASSERT_EQ(ret, 1, "xsk_ring_cons__peek"))
303 return -2;
304
305 rx_desc = xsk_ring_cons__rx_desc(&xsk->rx, idx);
306 comp_addr = xsk_umem__extract_addr(rx_desc->addr);
307 addr = xsk_umem__add_offset_to_addr(rx_desc->addr);
308 printf("%p: rx_desc[%u]->addr=%llx addr=%llx comp_addr=%llx\n",
309 xsk, idx, rx_desc->addr, addr, comp_addr);
310 data = xsk_umem__get_data(xsk->umem_area, addr);
311
312 /* Make sure we got the packet offset correctly. */
313
314 eth = data;
315 ASSERT_EQ(eth->h_proto, htons(ETH_P_IP), "eth->h_proto");
316 iph = (void *)(eth + 1);
317 ASSERT_EQ((int)iph->version, 4, "iph->version");
318 udph = (void *)(iph + 1);
319
320 /* custom metadata */
321
322 meta = data - sizeof(struct xdp_meta);
323
324 if (!ASSERT_NEQ(meta->rx_timestamp, 0, "rx_timestamp"))
325 return -1;
326
327 if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
328 return -1;
329
330 if (!sent_from_af_xdp) {
331 if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
332 return -1;
333
334 if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
335 return -1;
336
337 if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
338 return -1;
339 goto done;
340 }
341
342 ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
343
344 /* checksum offload */
345 ASSERT_EQ(udph->check, htons(0x721c), "csum");
346
347done:
348 xsk_ring_cons__release(&xsk->rx, 1);
349 refill_rx(xsk, comp_addr);
350
351 return 0;
352}
353
354static void switch_ns_to_rx(struct nstoken **tok)
355{
356 close_netns(*tok);
357 *tok = open_netns(RX_NETNS_NAME);
358}
359
360static void switch_ns_to_tx(struct nstoken **tok)
361{
362 close_netns(*tok);
363 *tok = open_netns(TX_NETNS_NAME);
364}
365
366void test_xdp_metadata(void)
367{
368 struct xdp_metadata2 *bpf_obj2 = NULL;
369 struct xdp_metadata *bpf_obj = NULL;
370 struct bpf_program *new_prog, *prog;
371 struct nstoken *tok = NULL;
372 __u32 queue_id = QUEUE_ID;
373 struct bpf_map *prog_arr;
374 struct xsk tx_xsk = {};
375 struct xsk rx_xsk = {};
376 __u32 val, key = 0;
377 int retries = 10;
378 int rx_ifindex;
379 int tx_ifindex;
380 int sock_fd;
381 int ret;
382
383 /* Setup new networking namespaces, with a veth pair. */
384 SYS(out, "ip netns add " TX_NETNS_NAME);
385 SYS(out, "ip netns add " RX_NETNS_NAME);
386
387 tok = open_netns(TX_NETNS_NAME);
388 if (!ASSERT_OK_PTR(tok, "setns"))
389 goto out;
390 SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
391 " type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
392 SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);
393
394 SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
395 SYS(out, "ip link set dev " TX_NAME " up");
396
397 SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
398 " type vlan proto " VLAN_PROTO " id " TO_STR(VLAN_ID));
399 SYS(out, "ip link set dev " TX_NAME_VLAN " up");
400 SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
401
402 /* Avoid ARP calls */
403 SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
404
405 switch_ns_to_rx(&tok);
406 if (!ASSERT_OK_PTR(tok, "setns rx"))
407 goto out;
408
409 SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
410 SYS(out, "ip link set dev " RX_NAME " up");
411 SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
412
413 rx_ifindex = if_nametoindex(RX_NAME);
414
415 /* Setup separate AF_XDP for RX interface. */
416
417 ret = open_xsk(rx_ifindex, &rx_xsk);
418 if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
419 goto out;
420
421 bpf_obj = xdp_metadata__open();
422 if (!ASSERT_OK_PTR(bpf_obj, "open skeleton"))
423 goto out;
424
425 prog = bpf_object__find_program_by_name(bpf_obj->obj, "rx");
426 bpf_program__set_ifindex(prog, rx_ifindex);
427 bpf_program__set_flags(prog, BPF_F_XDP_DEV_BOUND_ONLY);
428
429 if (!ASSERT_OK(xdp_metadata__load(bpf_obj), "load skeleton"))
430 goto out;
431
432 /* Make sure we can't add dev-bound programs to prog maps. */
433 prog_arr = bpf_object__find_map_by_name(bpf_obj->obj, "prog_arr");
434 if (!ASSERT_OK_PTR(prog_arr, "no prog_arr map"))
435 goto out;
436
437 val = bpf_program__fd(prog);
438 if (!ASSERT_ERR(bpf_map__update_elem(prog_arr, &key, sizeof(key),
439 &val, sizeof(val), BPF_ANY),
440 "update prog_arr"))
441 goto out;
442
443 /* Attach BPF program to RX interface. */
444
445 ret = bpf_xdp_attach(rx_ifindex,
446 bpf_program__fd(bpf_obj->progs.rx),
447 XDP_FLAGS, NULL);
448 if (!ASSERT_GE(ret, 0, "bpf_xdp_attach"))
449 goto out;
450
451 sock_fd = xsk_socket__fd(rx_xsk.socket);
452 ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
453 if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
454 goto out;
455
456 switch_ns_to_tx(&tok);
457 if (!ASSERT_OK_PTR(tok, "setns tx"))
458 goto out;
459
460 /* Setup separate AF_XDP for TX interface nad send packet to the RX socket. */
461 tx_ifindex = if_nametoindex(TX_NAME);
462 ret = open_xsk(tx_ifindex, &tx_xsk);
463 if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
464 goto out;
465
466 if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
467 "generate AF_XDP_CONSUMER_PORT"))
468 goto out;
469
470 switch_ns_to_rx(&tok);
471 if (!ASSERT_OK_PTR(tok, "setns rx"))
472 goto out;
473
474 /* Verify packet sent from AF_XDP has proper metadata. */
475 if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, true), 0,
476 "verify_xsk_metadata"))
477 goto out;
478
479 switch_ns_to_tx(&tok);
480 if (!ASSERT_OK_PTR(tok, "setns tx"))
481 goto out;
482 complete_tx(&tx_xsk);
483
484 /* Now check metadata of packet, generated with network stack */
485 if (!ASSERT_GE(generate_packet_inet(), 0, "generate UDP packet"))
486 goto out;
487
488 switch_ns_to_rx(&tok);
489 if (!ASSERT_OK_PTR(tok, "setns rx"))
490 goto out;
491
492 if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, false), 0,
493 "verify_xsk_metadata"))
494 goto out;
495
496 /* Make sure freplace correctly picks up original bound device
497 * and doesn't crash.
498 */
499
500 bpf_obj2 = xdp_metadata2__open();
501 if (!ASSERT_OK_PTR(bpf_obj2, "open skeleton"))
502 goto out;
503
504 new_prog = bpf_object__find_program_by_name(bpf_obj2->obj, "freplace_rx");
505 bpf_program__set_attach_target(new_prog, bpf_program__fd(prog), "rx");
506
507 if (!ASSERT_OK(xdp_metadata2__load(bpf_obj2), "load freplace skeleton"))
508 goto out;
509
510 if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
511 goto out;
512
513 switch_ns_to_tx(&tok);
514 if (!ASSERT_OK_PTR(tok, "setns tx"))
515 goto out;
516
517 /* Send packet to trigger . */
518 if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
519 "generate freplace packet"))
520 goto out;
521
522 switch_ns_to_rx(&tok);
523 if (!ASSERT_OK_PTR(tok, "setns rx"))
524 goto out;
525
526 while (!retries--) {
527 if (bpf_obj2->bss->called)
528 break;
529 usleep(10);
530 }
531 ASSERT_GT(bpf_obj2->bss->called, 0, "not called");
532
533out:
534 close_xsk(&rx_xsk);
535 close_xsk(&tx_xsk);
536 xdp_metadata2__destroy(bpf_obj2);
537 xdp_metadata__destroy(bpf_obj);
538 if (tok)
539 close_netns(tok);
540 SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
541 SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
542}