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