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 49 struct 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 59 static 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 } 126 127 static 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 } 135 136 static 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 } 152 153 static 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 } 219 220 static 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 } 243 244 static 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 } 264 265 static 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 } 275 276 static 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"); 346 347 done: 348 xsk_ring_cons__release(&xsk->rx, 1); 349 refill_rx(xsk, comp_addr); 350 351 return 0; 352 } 353 354 static void switch_ns_to_rx(struct nstoken **tok) 355 { 356 close_netns(*tok); 357 *tok = open_netns(RX_NETNS_NAME); 358 } 359 360 static void switch_ns_to_tx(struct nstoken **tok) 361 { 362 close_netns(*tok); 363 *tok = open_netns(TX_NETNS_NAME); 364 } 365 366 void 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"); 532 533 out: 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 } 543