1 /* 2 * Copyright 2013 Google Inc. 3 * Author: Willem de Bruijn (willemb@google.com) 4 * 5 * A basic test of packet socket fanout behavior. 6 * 7 * Control: 8 * - create fanout fails as expected with illegal flag combinations 9 * - join fanout fails as expected with diverging types or flags 10 * 11 * Datapath: 12 * Open a pair of packet sockets and a pair of INET sockets, send a known 13 * number of packets across the two INET sockets and count the number of 14 * packets enqueued onto the two packet sockets. 15 * 16 * The test currently runs for 17 * - PACKET_FANOUT_HASH 18 * - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER 19 * - PACKET_FANOUT_LB 20 * - PACKET_FANOUT_CPU 21 * - PACKET_FANOUT_ROLLOVER 22 * - PACKET_FANOUT_CBPF 23 * - PACKET_FANOUT_EBPF 24 * 25 * Todo: 26 * - functionality: PACKET_FANOUT_FLAG_DEFRAG 27 * 28 * License (GPLv2): 29 * 30 * This program is free software; you can redistribute it and/or modify it 31 * under the terms and conditions of the GNU General Public License, 32 * version 2, as published by the Free Software Foundation. 33 * 34 * This program is distributed in the hope it will be useful, but WITHOUT 35 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 36 * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for 37 * more details. 38 * 39 * You should have received a copy of the GNU General Public License along with 40 * this program; if not, write to the Free Software Foundation, Inc., 41 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 42 */ 43 44 #define _GNU_SOURCE /* for sched_setaffinity */ 45 46 #include <arpa/inet.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <linux/unistd.h> /* for __NR_bpf */ 50 #include <linux/filter.h> 51 #include <linux/bpf.h> 52 #include <linux/if_packet.h> 53 #include <net/if.h> 54 #include <net/ethernet.h> 55 #include <netinet/ip.h> 56 #include <netinet/udp.h> 57 #include <poll.h> 58 #include <sched.h> 59 #include <stdint.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <sys/mman.h> 64 #include <sys/socket.h> 65 #include <sys/stat.h> 66 #include <sys/types.h> 67 #include <unistd.h> 68 69 #include "psock_lib.h" 70 71 #define RING_NUM_FRAMES 20 72 73 /* Open a socket in a given fanout mode. 74 * @return -1 if mode is bad, a valid socket otherwise */ 75 static int sock_fanout_open(uint16_t typeflags, uint16_t group_id) 76 { 77 struct sockaddr_ll addr = {0}; 78 int fd, val; 79 80 fd = socket(PF_PACKET, SOCK_RAW, 0); 81 if (fd < 0) { 82 perror("socket packet"); 83 exit(1); 84 } 85 86 pair_udp_setfilter(fd); 87 88 addr.sll_family = AF_PACKET; 89 addr.sll_protocol = htons(ETH_P_IP); 90 addr.sll_ifindex = if_nametoindex("lo"); 91 if (addr.sll_ifindex == 0) { 92 perror("if_nametoindex"); 93 exit(1); 94 } 95 if (bind(fd, (void *) &addr, sizeof(addr))) { 96 perror("bind packet"); 97 exit(1); 98 } 99 100 val = (((int) typeflags) << 16) | group_id; 101 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) { 102 if (close(fd)) { 103 perror("close packet"); 104 exit(1); 105 } 106 return -1; 107 } 108 109 return fd; 110 } 111 112 static 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 = sizeof(bpf_filter) / sizeof(struct sock_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 } 129 130 static 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 } 143 144 static 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 = sizeof(prog) / sizeof(prog[0]); 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 } 189 190 static 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 } 221 222 static 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 } 234 235 static 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 */ 255 static 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 */ 267 static 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 creating a unique fanout group ids */ 304 static void test_unique_fanout_group_ids(void) 305 { 306 int fds[3]; 307 uint16_t typeflags, first_group_id, second_group_id; 308 309 fprintf(stderr, "test: unique ids\n"); 310 311 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH | 312 PACKET_FANOUT_FLAG_UNIQUEID, 0); 313 if (fds[0] == -1) { 314 fprintf(stderr, "ERROR: failed to create a unique id group.\n"); 315 exit(1); 316 } 317 318 sock_fanout_getopts(fds[0], &typeflags, &first_group_id); 319 if (typeflags != PACKET_FANOUT_HASH) { 320 fprintf(stderr, "ERROR: unexpected typeflags %x\n", typeflags); 321 exit(1); 322 } 323 324 if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) { 325 fprintf(stderr, "ERROR: joined group with wrong type.\n"); 326 exit(1); 327 } 328 329 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, first_group_id); 330 if (fds[1] == -1) { 331 fprintf(stderr, 332 "ERROR: failed to join previously created group.\n"); 333 exit(1); 334 } 335 336 fds[2] = sock_fanout_open(PACKET_FANOUT_HASH | 337 PACKET_FANOUT_FLAG_UNIQUEID, 0); 338 if (fds[2] == -1) { 339 fprintf(stderr, 340 "ERROR: failed to create a second unique id group.\n"); 341 exit(1); 342 } 343 344 sock_fanout_getopts(fds[2], &typeflags, &second_group_id); 345 if (sock_fanout_open(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_UNIQUEID, 346 second_group_id) != -1) { 347 fprintf(stderr, 348 "ERROR: specified a group id when requesting unique id\n"); 349 exit(1); 350 } 351 352 if (close(fds[0]) || close(fds[1]) || close(fds[2])) { 353 fprintf(stderr, "ERROR: closing sockets\n"); 354 exit(1); 355 } 356 } 357 358 static int test_datapath(uint16_t typeflags, int port_off, 359 const int expect1[], const int expect2[]) 360 { 361 const int expect0[] = { 0, 0 }; 362 char *rings[2]; 363 uint8_t type = typeflags & 0xFF; 364 int fds[2], fds_udp[2][2], ret; 365 366 fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n", 367 typeflags, PORT_BASE, PORT_BASE + port_off); 368 369 fds[0] = sock_fanout_open(typeflags, 0); 370 fds[1] = sock_fanout_open(typeflags, 0); 371 if (fds[0] == -1 || fds[1] == -1) { 372 fprintf(stderr, "ERROR: failed open\n"); 373 exit(1); 374 } 375 if (type == PACKET_FANOUT_CBPF) 376 sock_fanout_set_cbpf(fds[0]); 377 else if (type == PACKET_FANOUT_EBPF) 378 sock_fanout_set_ebpf(fds[0]); 379 380 rings[0] = sock_fanout_open_ring(fds[0]); 381 rings[1] = sock_fanout_open_ring(fds[1]); 382 pair_udp_open(fds_udp[0], PORT_BASE); 383 pair_udp_open(fds_udp[1], PORT_BASE + port_off); 384 sock_fanout_read(fds, rings, expect0); 385 386 /* Send data, but not enough to overflow a queue */ 387 pair_udp_send(fds_udp[0], 15); 388 pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1); 389 ret = sock_fanout_read(fds, rings, expect1); 390 391 /* Send more data, overflow the queue */ 392 pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1); 393 /* TODO: ensure consistent order between expect1 and expect2 */ 394 ret |= sock_fanout_read(fds, rings, expect2); 395 396 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) || 397 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) { 398 fprintf(stderr, "close rings\n"); 399 exit(1); 400 } 401 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) || 402 close(fds_udp[0][1]) || close(fds_udp[0][0]) || 403 close(fds[1]) || close(fds[0])) { 404 fprintf(stderr, "close datapath\n"); 405 exit(1); 406 } 407 408 return ret; 409 } 410 411 static int set_cpuaffinity(int cpuid) 412 { 413 cpu_set_t mask; 414 415 CPU_ZERO(&mask); 416 CPU_SET(cpuid, &mask); 417 if (sched_setaffinity(0, sizeof(mask), &mask)) { 418 if (errno != EINVAL) { 419 fprintf(stderr, "setaffinity %d\n", cpuid); 420 exit(1); 421 } 422 return 1; 423 } 424 425 return 0; 426 } 427 428 int main(int argc, char **argv) 429 { 430 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } }; 431 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 432 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } }; 433 const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 434 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } }; 435 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } }; 436 const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } }; 437 const int expect_uniqueid[2][2] = { { 20, 20}, { 20, 20 } }; 438 int port_off = 2, tries = 20, ret; 439 440 test_control_single(); 441 test_control_group(); 442 test_unique_fanout_group_ids(); 443 444 /* find a set of ports that do not collide onto the same socket */ 445 ret = test_datapath(PACKET_FANOUT_HASH, port_off, 446 expect_hash[0], expect_hash[1]); 447 while (ret) { 448 fprintf(stderr, "info: trying alternate ports (%d)\n", tries); 449 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off, 450 expect_hash[0], expect_hash[1]); 451 if (!--tries) { 452 fprintf(stderr, "too many collisions\n"); 453 return 1; 454 } 455 } 456 457 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, 458 port_off, expect_hash_rb[0], expect_hash_rb[1]); 459 ret |= test_datapath(PACKET_FANOUT_LB, 460 port_off, expect_lb[0], expect_lb[1]); 461 ret |= test_datapath(PACKET_FANOUT_ROLLOVER, 462 port_off, expect_rb[0], expect_rb[1]); 463 464 ret |= test_datapath(PACKET_FANOUT_CBPF, 465 port_off, expect_bpf[0], expect_bpf[1]); 466 ret |= test_datapath(PACKET_FANOUT_EBPF, 467 port_off, expect_bpf[0], expect_bpf[1]); 468 469 set_cpuaffinity(0); 470 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 471 expect_cpu0[0], expect_cpu0[1]); 472 if (!set_cpuaffinity(1)) 473 /* TODO: test that choice alternates with previous */ 474 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 475 expect_cpu1[0], expect_cpu1[1]); 476 477 ret |= test_datapath(PACKET_FANOUT_FLAG_UNIQUEID, port_off, 478 expect_uniqueid[0], expect_uniqueid[1]); 479 480 if (ret) 481 return 1; 482 483 printf("OK. All tests passed\n"); 484 return 0; 485 } 486