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/ethernet.h> 54 #include <netinet/ip.h> 55 #include <netinet/udp.h> 56 #include <poll.h> 57 #include <sched.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <sys/mman.h> 63 #include <sys/socket.h> 64 #include <sys/stat.h> 65 #include <sys/types.h> 66 #include <unistd.h> 67 68 #include "psock_lib.h" 69 70 #define RING_NUM_FRAMES 20 71 72 /* Open a socket in a given fanout mode. 73 * @return -1 if mode is bad, a valid socket otherwise */ 74 static int sock_fanout_open(uint16_t typeflags, int num_packets) 75 { 76 int fd, val; 77 78 fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); 79 if (fd < 0) { 80 perror("socket packet"); 81 exit(1); 82 } 83 84 /* fanout group ID is always 0: tests whether old groups are deleted */ 85 val = ((int) typeflags) << 16; 86 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) { 87 if (close(fd)) { 88 perror("close packet"); 89 exit(1); 90 } 91 return -1; 92 } 93 94 pair_udp_setfilter(fd); 95 return fd; 96 } 97 98 static void sock_fanout_set_ebpf(int fd) 99 { 100 const int len_off = __builtin_offsetof(struct __sk_buff, len); 101 struct bpf_insn prog[] = { 102 { BPF_ALU64 | BPF_MOV | BPF_X, 6, 1, 0, 0 }, 103 { BPF_LDX | BPF_W | BPF_MEM, 0, 6, len_off, 0 }, 104 { BPF_JMP | BPF_JGE | BPF_K, 0, 0, 1, DATA_LEN }, 105 { BPF_JMP | BPF_JA | BPF_K, 0, 0, 4, 0 }, 106 { BPF_LD | BPF_B | BPF_ABS, 0, 0, 0, 0x50 }, 107 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 2, DATA_CHAR }, 108 { BPF_JMP | BPF_JEQ | BPF_K, 0, 0, 1, DATA_CHAR_1 }, 109 { BPF_ALU | BPF_MOV | BPF_K, 0, 0, 0, 0 }, 110 { BPF_JMP | BPF_EXIT, 0, 0, 0, 0 } 111 }; 112 char log_buf[512]; 113 union bpf_attr attr; 114 int pfd; 115 116 memset(&attr, 0, sizeof(attr)); 117 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; 118 attr.insns = (unsigned long) prog; 119 attr.insn_cnt = sizeof(prog) / sizeof(prog[0]); 120 attr.license = (unsigned long) "GPL"; 121 attr.log_buf = (unsigned long) log_buf, 122 attr.log_size = sizeof(log_buf), 123 attr.log_level = 1, 124 125 pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); 126 if (pfd < 0) { 127 perror("bpf"); 128 fprintf(stderr, "bpf verifier:\n%s\n", log_buf); 129 exit(1); 130 } 131 132 if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) { 133 perror("fanout data ebpf"); 134 exit(1); 135 } 136 137 if (close(pfd)) { 138 perror("close ebpf"); 139 exit(1); 140 } 141 } 142 143 static char *sock_fanout_open_ring(int fd) 144 { 145 struct tpacket_req req = { 146 .tp_block_size = getpagesize(), 147 .tp_frame_size = getpagesize(), 148 .tp_block_nr = RING_NUM_FRAMES, 149 .tp_frame_nr = RING_NUM_FRAMES, 150 }; 151 char *ring; 152 int val = TPACKET_V2; 153 154 if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val, 155 sizeof(val))) { 156 perror("packetsock ring setsockopt version"); 157 exit(1); 158 } 159 if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req, 160 sizeof(req))) { 161 perror("packetsock ring setsockopt"); 162 exit(1); 163 } 164 165 ring = mmap(0, req.tp_block_size * req.tp_block_nr, 166 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 167 if (ring == MAP_FAILED) { 168 perror("packetsock ring mmap"); 169 exit(1); 170 } 171 172 return ring; 173 } 174 175 static int sock_fanout_read_ring(int fd, void *ring) 176 { 177 struct tpacket2_hdr *header = ring; 178 int count = 0; 179 180 while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) { 181 count++; 182 header = ring + (count * getpagesize()); 183 } 184 185 return count; 186 } 187 188 static int sock_fanout_read(int fds[], char *rings[], const int expect[]) 189 { 190 int ret[2]; 191 192 ret[0] = sock_fanout_read_ring(fds[0], rings[0]); 193 ret[1] = sock_fanout_read_ring(fds[1], rings[1]); 194 195 fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n", 196 ret[0], ret[1], expect[0], expect[1]); 197 198 if ((!(ret[0] == expect[0] && ret[1] == expect[1])) && 199 (!(ret[0] == expect[1] && ret[1] == expect[0]))) { 200 fprintf(stderr, "ERROR: incorrect queue lengths\n"); 201 return 1; 202 } 203 204 return 0; 205 } 206 207 /* Test illegal mode + flag combination */ 208 static void test_control_single(void) 209 { 210 fprintf(stderr, "test: control single socket\n"); 211 212 if (sock_fanout_open(PACKET_FANOUT_ROLLOVER | 213 PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) { 214 fprintf(stderr, "ERROR: opened socket with dual rollover\n"); 215 exit(1); 216 } 217 } 218 219 /* Test illegal group with different modes or flags */ 220 static void test_control_group(void) 221 { 222 int fds[2]; 223 224 fprintf(stderr, "test: control multiple sockets\n"); 225 226 fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20); 227 if (fds[0] == -1) { 228 fprintf(stderr, "ERROR: failed to open HASH socket\n"); 229 exit(1); 230 } 231 if (sock_fanout_open(PACKET_FANOUT_HASH | 232 PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) { 233 fprintf(stderr, "ERROR: joined group with wrong flag defrag\n"); 234 exit(1); 235 } 236 if (sock_fanout_open(PACKET_FANOUT_HASH | 237 PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) { 238 fprintf(stderr, "ERROR: joined group with wrong flag ro\n"); 239 exit(1); 240 } 241 if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) { 242 fprintf(stderr, "ERROR: joined group with wrong mode\n"); 243 exit(1); 244 } 245 fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20); 246 if (fds[1] == -1) { 247 fprintf(stderr, "ERROR: failed to join group\n"); 248 exit(1); 249 } 250 if (close(fds[1]) || close(fds[0])) { 251 fprintf(stderr, "ERROR: closing sockets\n"); 252 exit(1); 253 } 254 } 255 256 static int test_datapath(uint16_t typeflags, int port_off, 257 const int expect1[], const int expect2[]) 258 { 259 const int expect0[] = { 0, 0 }; 260 char *rings[2]; 261 uint8_t type = typeflags & 0xFF; 262 int fds[2], fds_udp[2][2], ret; 263 264 fprintf(stderr, "test: datapath 0x%hx\n", typeflags); 265 266 fds[0] = sock_fanout_open(typeflags, 20); 267 fds[1] = sock_fanout_open(typeflags, 20); 268 if (fds[0] == -1 || fds[1] == -1) { 269 fprintf(stderr, "ERROR: failed open\n"); 270 exit(1); 271 } 272 if (type == PACKET_FANOUT_CBPF) 273 sock_setfilter(fds[0], SOL_PACKET, PACKET_FANOUT_DATA); 274 else if (type == PACKET_FANOUT_EBPF) 275 sock_fanout_set_ebpf(fds[0]); 276 277 rings[0] = sock_fanout_open_ring(fds[0]); 278 rings[1] = sock_fanout_open_ring(fds[1]); 279 pair_udp_open(fds_udp[0], PORT_BASE); 280 pair_udp_open(fds_udp[1], PORT_BASE + port_off); 281 sock_fanout_read(fds, rings, expect0); 282 283 /* Send data, but not enough to overflow a queue */ 284 pair_udp_send(fds_udp[0], 15); 285 pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1); 286 ret = sock_fanout_read(fds, rings, expect1); 287 288 /* Send more data, overflow the queue */ 289 pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1); 290 /* TODO: ensure consistent order between expect1 and expect2 */ 291 ret |= sock_fanout_read(fds, rings, expect2); 292 293 if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) || 294 munmap(rings[0], RING_NUM_FRAMES * getpagesize())) { 295 fprintf(stderr, "close rings\n"); 296 exit(1); 297 } 298 if (close(fds_udp[1][1]) || close(fds_udp[1][0]) || 299 close(fds_udp[0][1]) || close(fds_udp[0][0]) || 300 close(fds[1]) || close(fds[0])) { 301 fprintf(stderr, "close datapath\n"); 302 exit(1); 303 } 304 305 return ret; 306 } 307 308 static int set_cpuaffinity(int cpuid) 309 { 310 cpu_set_t mask; 311 312 CPU_ZERO(&mask); 313 CPU_SET(cpuid, &mask); 314 if (sched_setaffinity(0, sizeof(mask), &mask)) { 315 if (errno != EINVAL) { 316 fprintf(stderr, "setaffinity %d\n", cpuid); 317 exit(1); 318 } 319 return 1; 320 } 321 322 return 0; 323 } 324 325 int main(int argc, char **argv) 326 { 327 const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } }; 328 const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 329 const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } }; 330 const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } }; 331 const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } }; 332 const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } }; 333 const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } }; 334 int port_off = 2, tries = 5, ret; 335 336 test_control_single(); 337 test_control_group(); 338 339 /* find a set of ports that do not collide onto the same socket */ 340 ret = test_datapath(PACKET_FANOUT_HASH, port_off, 341 expect_hash[0], expect_hash[1]); 342 while (ret && tries--) { 343 fprintf(stderr, "info: trying alternate ports (%d)\n", tries); 344 ret = test_datapath(PACKET_FANOUT_HASH, ++port_off, 345 expect_hash[0], expect_hash[1]); 346 } 347 348 ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER, 349 port_off, expect_hash_rb[0], expect_hash_rb[1]); 350 ret |= test_datapath(PACKET_FANOUT_LB, 351 port_off, expect_lb[0], expect_lb[1]); 352 ret |= test_datapath(PACKET_FANOUT_ROLLOVER, 353 port_off, expect_rb[0], expect_rb[1]); 354 355 ret |= test_datapath(PACKET_FANOUT_CBPF, 356 port_off, expect_bpf[0], expect_bpf[1]); 357 ret |= test_datapath(PACKET_FANOUT_EBPF, 358 port_off, expect_bpf[0], expect_bpf[1]); 359 360 set_cpuaffinity(0); 361 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 362 expect_cpu0[0], expect_cpu0[1]); 363 if (!set_cpuaffinity(1)) 364 /* TODO: test that choice alternates with previous */ 365 ret |= test_datapath(PACKET_FANOUT_CPU, port_off, 366 expect_cpu1[0], expect_cpu1[1]); 367 368 if (ret) 369 return 1; 370 371 printf("OK. All tests passed\n"); 372 return 0; 373 } 374