1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright 2013 Google Inc. 4 * Author: Willem de Bruijn (willemb@google.com) 5 * 6 * A basic test of packet socket fanout behavior. 7 * 8 * Control: 9 * - create fanout fails as expected with illegal flag combinations 10 * - join fanout fails as expected with diverging types or flags 11 * 12 * Datapath: 13 * Open a pair of packet sockets and a pair of INET sockets, send a known 14 * number of packets across the two INET sockets and count the number of 15 * packets enqueued onto the two packet sockets. 16 * 17 * The test currently runs for 18 * - PACKET_FANOUT_HASH 19 * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER 20 * - PACKET_FANOUT_LB 21 * - PACKET_FANOUT_CPU 22 * - PACKET_FANOUT_ROLLOVER 23 * - PACKET_FANOUT_CBPF 24 * - PACKET_FANOUT_EBPF 25 * 26 * Todo: 27 * - functionality: PACKET_FANOUT_FLAG_DEFRAG 28 */ 29 30#define _GNU_SOURCE /* for sched_setaffinity */ 31 32#include <arpa/inet.h> 33#include <errno.h> 34#include <fcntl.h> 35#include <linux/unistd.h> /* for __NR_bpf */ 36#include <linux/filter.h> 37#include <linux/bpf.h> 38#include <linux/if_packet.h> 39#include <net/if.h> 40#include <net/ethernet.h> 41#include <netinet/ip.h> 42#include <netinet/udp.h> 43#include <poll.h> 44#include <sched.h> 45#include <stdint.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49#include <sys/mman.h> 50#include <sys/socket.h> 51#include <sys/stat.h> 52#include <sys/types.h> 53#include <unistd.h> 54 55#include "psock_lib.h" 56#include "../kselftest.h" 57 58#define RING_NUM_FRAMES 20 59 60static uint32_t cfg_max_num_members; 61 62/* Open a socket in a given fanout mode. 63 * @return -1 if mode is bad, a valid socket otherwise */ 64static int sock_fanout_open(uint16_t typeflags, uint16_t group_id) 65{ 66 struct sockaddr_ll addr = {0}; 67 struct fanout_args args; 68 int fd, val, err; 69 70 fd = socket(PF_PACKET, SOCK_RAW, 0); 71 if (fd < 0) { 72 perror("socket packet"); 73 exit(1); 74 } 75 76 pair_udp_setfilter(fd); 77 78 addr.sll_family = AF_PACKET; 79 addr.sll_protocol = htons(ETH_P_IP); 80 addr.sll_ifindex = if_nametoindex("lo"); 81 if (addr.sll_ifindex == 0) { 82 perror("if_nametoindex"); 83 exit(1); 84 } 85 if (bind(fd, (void *) &addr, sizeof(addr))) { 86 perror("bind packet"); 87 exit(1); 88 } 89 90 if (cfg_max_num_members) { 91 args.id = group_id; 92 args.type_flags = typeflags; 93 args.max_num_members = cfg_max_num_members; 94 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &args, 95 sizeof(args)); 96 } else { 97 val = (((int) typeflags) << 16) | group_id; 98 err = setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, 99 sizeof(val)); 100 } 101 if (err) { 102 if (close(fd)) { 103 perror("close packet"); 104 exit(1); 105 } 106 return -1; 107 } 108 109 return fd; 110} 111 112static void sock_fanout_set_cbpf(int fd) 113{ 114 struct sock_filter bpf_filter[] = { 115 BPF_STMT(BPF_LD | BPF_B | BPF_ABS, 80), /* ldb [80] */ 116 BPF_STMT(BPF_RET | BPF_A, 0), /* ret A */ 117 }; 118 struct sock_fprog bpf_prog; 119 120 bpf_prog.filter = bpf_filter; 121 bpf_prog.len = ARRAY_SIZE(bpf_filter); 122 123 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &bpf_prog, 124 sizeof(bpf_prog))) { 125 perror("fanout data cbpf"); 126 exit(1); 127 } 128} 129 130static void sock_fanout_getopts(int fd, uint16_t *typeflags, uint16_t *group_id) 131{ 132 int sockopt; 133 socklen_t sockopt_len = sizeof(sockopt); 134 135 if (getsockopt(fd, SOL_PACKET, PACKET_FANOUT, 136 &sockopt, &sockopt_len)) { 137 perror("failed to getsockopt"); 138 exit(1); 139 } 140 *typeflags = sockopt >> 16; 141 *group_id = sockopt & 0xfffff; 142} 143 144static void sock_fanout_set_ebpf(int fd) 145{ 146 static char log_buf[65536]; 147 148 const int len_off = __builtin_offsetof(struct __sk_buff, len); 149 struct bpf_insn prog[] = { 150 { BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 }, 151 { BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 }, 152 { BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN }, 153 { BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 }, 154 { BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 }, 155 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR }, 156 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 }, 157 { BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 }, 158 { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 } 159 }; 160 union bpf_attr attr; 161 int pfd; 162 163 memset(&attr, 0, sizeof(attr)); 164 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; 165 attr.insns = (unsigned long) prog; 166 attr.insn_cnt = ARRAY_SIZE(prog); 167 attr.license = (unsigned long) "GPL"; 168 attr.log_buf = (unsigned long) log_buf, 169 attr.log_size = sizeof(log_buf), 170 attr.log_level = 1, 171 172 pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); 173 if (pfd < 0) { 174 perror("bpf"); 175 fprintf(stderr, "bpf verifier:\n%s\n", log_buf); 176 exit(1); 177 } 178 179 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) { 180 perror("fanout data ebpf"); 181 exit(1); 182 } 183 184 if (close(pfd)) { 185 perror("close ebpf"); 186 exit(1); 187 } 188} 189 190static char *sock_fanout_open_ring(int fd) 191{ 192 struct tpacket_req req = { 193 .tp_block_size = getpagesize(), 194 .tp_frame_size = getpagesize(), 195 .tp_block_nr = RING_NUM_FRAMES, 196 .tp_frame_nr = RING_NUM_FRAMES, 197 }; 198 char *ring; 199 int val = TPACKET_V2; 200 201 if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val, 202 sizeof(val))) { 203 perror("packetsock ring setsockopt version"); 204 exit(1); 205 } 206 if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req, 207 sizeof(req))) { 208 perror("packetsock ring setsockopt"); 209 exit(1); 210 } 211 212 ring = mmap(0, req.tp_block_size * req.tp_block_nr, 213 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 214 if (ring == MAP_FAILED) { 215 perror("packetsock ring mmap"); 216 exit(1); 217 } 218 219 return ring; 220} 221 222static int sock_fanout_read_ring(int fd, void *ring) 223{ 224 struct tpacket2_hdr *header = ring; 225 int count = 0; 226 227 while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) { 228 count++; 229 header = ring + (count * getpagesize()); 230 } 231 232 return count; 233} 234 235static int sock_fanout_read(int fds[], char *rings[], const int expect[]) 236{ 237 int ret[2]; 238 239 ret[0] = sock_fanout_read_ring(fds[0], rings[0]); 240 ret[1] = sock_fanout_read_ring(fds[1], rings[1]); 241 242 fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n", 243 ret[0], ret[1], expect[0], expect[1]); 244 245 if ((!(ret[0] == expect[0] && ret[1] == expect[1])) && 246 (!(ret[0] == expect[1] && ret[1] == expect[0]))) { 247 fprintf(stderr, "warning: incorrect queue lengths\n"); 248 return 1; 249 } 250 251 return 0; 252} 253 254/* Test illegal mode + flag combination */ 255static void test_control_single(void) 256{ 257 fprintf(stderr, "test: control single socket\n"); 258 259 if (sock_fanout_open(PACKET_FANOUT_ROLLOVER | 260 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) { 261 fprintf(stderr, "ERROR: opened socket with dual rollover\n"); 262 exit(1); 263 } 264} 265 266/* Test illegal group with different modes or flags */ 267static void test_control_group(void) 268{ 269 int fds[2]; 270 271 fprintf(stderr, "test: control multiple sockets\n"); 272 273 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0); 274 if (fds[0] == -1) { 275 fprintf(stderr, "ERROR: failed to open HASH socket\n"); 276 exit(1); 277 } 278 if (sock_fanout_open(PACKET_FANOUT_HASH | 279 PACKET_FANOUT_FLAG_DEFRAG, 0) != -1) { 280 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n"); 281 exit(1); 282 } 283 if (sock_fanout_open(PACKET_FANOUT_HASH | 284 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) { 285 fprintf(stderr, "ERROR: joined group with wrong flag ro\n"); 286 exit(1); 287 } 288 if (sock_fanout_open(PACKET_FANOUT_CPU, 0) != -1) { 289 fprintf(stderr, "ERROR: joined group with wrong mode\n"); 290 exit(1); 291 } 292 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0); 293 if (fds[1] == -1) { 294 fprintf(stderr, "ERROR: failed to join group\n"); 295 exit(1); 296 } 297 if (close(fds[1]) || close(fds[0])) { 298 fprintf(stderr, "ERROR: closing sockets\n"); 299 exit(1); 300 } 301} 302 303/* Test illegal max_num_members values */ 304static void test_control_group_max_num_members(void) 305{ 306 int fds[3]; 307 308 fprintf(stderr, "test: control multiple sockets, max_num_members\n"); 309 310 /* expected failure on greater than PACKET_FANOUT_MAX */ 311 cfg_max_num_members = (1 << 16) + 1; 312 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) { 313 fprintf(stderr, "ERROR: max_num_members > PACKET_FANOUT_MAX\n"); 314 exit(1); 315 } 316 317 cfg_max_num_members = 256; 318 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 0); 319 if (fds[0] == -1) { 320 fprintf(stderr, "ERROR: failed open\n"); 321 exit(1); 322 } 323 324 /* expected failure on joining group with different max_num_members */ 325 cfg_max_num_members = 257; 326 if (sock_fanout_open(PACKET_FANOUT_HASH, 0) != -1) { 327 fprintf(stderr, "ERROR: set different max_num_members\n"); 328 exit(1); 329 } 330 331 /* success on joining group with same max_num_members */ 332 cfg_max_num_members = 256; 333 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 0); 334 if (fds[1] == -1) { 335 fprintf(stderr, "ERROR: failed to join group\n"); 336 exit(1); 337 } 338 339 /* success on joining group with max_num_members unspecified */ 340 cfg_max_num_members = 0; 341 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH, 0); 342 if (fds[2] == -1) { 343 fprintf(stderr, "ERROR: failed to join group\n"); 344 exit(1); 345 } 346 347 if (close(fds[2]) || close(fds[1]) || close(fds[0])) { 348 fprintf(stderr, "ERROR: closing sockets\n"); 349 exit(1); 350 } 351} 352 353/* Test creating a unique fanout group ids */ 354static void test_unique_fanout_group_ids(void) 355{ 356 int fds[3]; 357 uint16_t typeflags, first_group_id, second_group_id; 358 359 fprintf(stderr, "test: unique ids\n"); 360 361 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH | 362 PACKET_FANOUT_FLAG_UNIQUEID, 0); 363 if (fds[0] == -1) { 364 fprintf(stderr, "ERROR: failed to create a unique id group.\n"); 365 exit(1); 366 } 367 368 sock_fanout_getopts(fds[0], &typeflags, &first_group_id); 369 if (typeflags != PACKET_FANOUT_HASH) { 370 fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags); 371 exit(1); 372 } 373 374 if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) { 375 fprintf(stderr, "ERROR: joined group with wrong type.\n"); 376 exit(1); 377 } 378 379 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id); 380 if (fds[1] == -1) { 381 fprintf(stderr, 382 "ERROR: failed to join previously created group.\n"); 383 exit(1); 384 } 385 386 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH | 387 PACKET_FANOUT_FLAG_UNIQUEID, 0); 388 if (fds[2] == -1) { 389 fprintf(stderr, 390 "ERROR: failed to create a second unique id group.\n"); 391 exit(1); 392 } 393 394 sock_fanout_getopts(fds[2], &typeflags, &second_group_id); 395 if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID, 396 second_group_id) != -1) { 397 fprintf(stderr, 398 "ERROR: specified a group id when requesting unique id\n"); 399 exit(1); 400 } 401 402 if (close(fds[0]) || close(fds[1]) || close(fds[2])) { 403 fprintf(stderr, "ERROR: closing sockets\n"); 404 exit(1); 405 } 406} 407 408static int test_datapath(uint16_t typeflags, int port_off, 409 const int expect1[], const int expect2[]) 410{ 411 const int expect0[] = { 0, 0 }; 412 char *rings[2]; 413 uint8_t type = typeflags & 0xFF; 414 int fds[2], fds_udp[2][2], ret; 415 416 fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n", 417 typeflags, (uint16_t)PORT_BASE, 418 (uint16_t)(PORT_BASE + port_off)); 419 420 fds[0] = sock_fanout_open(typeflags, 0); 421 fds[1] = sock_fanout_open(typeflags, 0); 422 if (fds[0] == -1 || fds[1] == -1) { 423 fprintf(stderr, "ERROR: failed open\n"); 424 exit(1); 425 } 426 if (type == PACKET_FANOUT_CBPF) 427 sock_fanout_set_cbpf(fds[0]); 428 else if (type == PACKET_FANOUT_EBPF) 429 sock_fanout_set_ebpf(fds[0]); 430 431 rings[0] = sock_fanout_open_ring(fds[0]); 432 rings[1] = sock_fanout_open_ring(fds[1]); 433 pair_udp_open(fds_udp[0], PORT_BASE); 434 pair_udp_open(fds_udp[1], PORT_BASE + port_off); 435 sock_fanout_read(fds, rings, expect0); 436 437 /* Send data, but not enough to overflow a queue */ 438 pair_udp_send(fds_udp[0], 15); 439 pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1); 440 ret = sock_fanout_read(fds, rings, expect1); 441 442 /* Send more data, overflow the queue */ 443 pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1); 444 /* TODO: ensure consistent order between expect1 and expect2 */ 445 ret |= sock_fanout_read(fds, rings, expect2); 446 447 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) || 448 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) { 449 fprintf(stderr, "close rings\n"); 450 exit(1); 451 } 452 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) || 453 close(fds_udp[0][1]) || close(fds_udp[0][0]) || 454 close(fds[1]) || close(fds[0])) { 455 fprintf(stderr, "close datapath\n"); 456 exit(1); 457 } 458 459 return ret; 460} 461 462static int set_cpuaffinity(int cpuid) 463{ 464 cpu_set_t mask; 465 466 CPU_ZERO(&mask); 467 CPU_SET(cpuid, &mask); 468 if (sched_setaffinity(0, sizeof(mask), &mask)) { 469 if (errno != EINVAL) { 470 fprintf(stderr, "setaffinity %d\n", cpuid); 471 exit(1); 472 } 473 return 1; 474 } 475 476 return 0; 477} 478 479int main(int argc, char **argv) 480{ 481 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } }; 482 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 483 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } }; 484 const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 485 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } }; 486 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } }; 487 const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } }; 488 const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } }; 489 int port_off = 2, tries = 20, ret; 490 491 test_control_single(); 492 test_control_group(); 493 test_control_group_max_num_members(); 494 test_unique_fanout_group_ids(); 495 496 /* PACKET_FANOUT_MAX */ 497 cfg_max_num_members = 1 << 16; 498 /* find a set of ports that do not collide onto the same socket */ 499 ret = test_datapath(PACKET_FANOUT_HASH, port_off, 500 expect_hash[0], expect_hash[1]); 501 while (ret) { 502 fprintf(stderr, "info: trying alternate ports (%d)\n", tries); 503 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off, 504 expect_hash[0], expect_hash[1]); 505 if (!--tries) { 506 fprintf(stderr, "too many collisions\n"); 507 return 1; 508 } 509 } 510 511 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, 512 port_off, expect_hash_rb[0], expect_hash_rb[1]); 513 ret |= test_datapath(PACKET_FANOUT_LB, 514 port_off, expect_lb[0], expect_lb[1]); 515 ret |= test_datapath(PACKET_FANOUT_ROLLOVER, 516 port_off, expect_rb[0], expect_rb[1]); 517 518 ret |= test_datapath(PACKET_FANOUT_CBPF, 519 port_off, expect_bpf[0], expect_bpf[1]); 520 ret |= test_datapath(PACKET_FANOUT_EBPF, 521 port_off, expect_bpf[0], expect_bpf[1]); 522 523 set_cpuaffinity(0); 524 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 525 expect_cpu0[0], expect_cpu0[1]); 526 if (!set_cpuaffinity(1)) 527 /* TODO: test that choice alternates with previous */ 528 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 529 expect_cpu1[0], expect_cpu1[1]); 530 531 ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off, 532 expect_uniqueid[0], expect_uniqueid[1]); 533 534 if (ret) 535 return 1; 536 537 printf("OK. All tests passed\n"); 538 return 0; 539} 540