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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <arpa/inet.h> #include <error.h> #include <errno.h> #include <limits.h> #include <linux/errqueue.h> #include <linux/if_packet.h> #include <linux/socket.h> #include <linux/sockios.h> #include <net/ethernet.h> #include <net/if.h> #include <netinet/ip.h> #include <netinet/ip6.h> #include <netinet/tcp.h> #include <netinet/udp.h> #include <poll.h> #include <sched.h> #include <stdbool.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/time.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #ifndef UDP_GRO #define UDP_GRO 104 #endif static int cfg_port = 8000; static bool cfg_tcp; static bool cfg_verify; static bool cfg_read_all; static bool cfg_gro_segment; static int cfg_family = PF_INET6; static int cfg_alen = sizeof(struct sockaddr_in6); static int cfg_expected_pkt_nr; static int cfg_expected_pkt_len; static int cfg_expected_gso_size; static int cfg_connect_timeout_ms; static int cfg_rcv_timeout_ms; static struct sockaddr_storage cfg_bind_addr; static bool interrupted; static unsigned long packets, bytes; static void sigint_handler(int signum) { if (signum == SIGINT) interrupted = true; } static void setup_sockaddr(int domain, const char *str_addr, void *sockaddr) { struct sockaddr_in6 *addr6 = (void *) sockaddr; struct sockaddr_in *addr4 = (void *) sockaddr; switch (domain) { case PF_INET: addr4->sin_family = AF_INET; addr4->sin_port = htons(cfg_port); if (inet_pton(AF_INET, str_addr, &(addr4->sin_addr)) != 1) error(1, 0, "ipv4 parse error: %s", str_addr); break; case PF_INET6: addr6->sin6_family = AF_INET6; addr6->sin6_port = htons(cfg_port); if (inet_pton(AF_INET6, str_addr, &(addr6->sin6_addr)) != 1) error(1, 0, "ipv6 parse error: %s", str_addr); break; default: error(1, 0, "illegal domain"); } } static unsigned long gettimeofday_ms(void) { struct timeval tv; gettimeofday(&tv, NULL); return (tv.tv_sec * 1000) + (tv.tv_usec / 1000); } static void do_poll(int fd, int timeout_ms) { struct pollfd pfd; int ret; pfd.events = POLLIN; pfd.revents = 0; pfd.fd = fd; do { ret = poll(&pfd, 1, 10); if (interrupted) break; if (ret == -1) error(1, errno, "poll"); if (ret == 0) { if (!timeout_ms) continue; timeout_ms -= 10; if (timeout_ms <= 0) { interrupted = true; break; } /* no events and more time to wait, do poll again */ continue; } if (pfd.revents != POLLIN) error(1, errno, "poll: 0x%x expected 0x%x\n", pfd.revents, POLLIN); } while (!ret); } static int do_socket(bool do_tcp) { int fd, val; fd = socket(cfg_family, cfg_tcp ? SOCK_STREAM : SOCK_DGRAM, 0); if (fd == -1) error(1, errno, "socket"); val = 1 << 21; if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val))) error(1, errno, "setsockopt rcvbuf"); val = 1; if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val))) error(1, errno, "setsockopt reuseport"); if (bind(fd, (void *)&cfg_bind_addr, cfg_alen)) error(1, errno, "bind"); if (do_tcp) { int accept_fd = fd; if (listen(accept_fd, 1)) error(1, errno, "listen"); do_poll(accept_fd, cfg_connect_timeout_ms); if (interrupted) exit(0); fd = accept(accept_fd, NULL, NULL); if (fd == -1) error(1, errno, "accept"); if (close(accept_fd)) error(1, errno, "close accept fd"); } return fd; } /* Flush all outstanding bytes for the tcp receive queue */ static void do_flush_tcp(int fd) { int ret; while (true) { /* MSG_TRUNC flushes up to len bytes */ ret = recv(fd, NULL, 1 << 21, MSG_TRUNC | MSG_DONTWAIT); if (ret == -1 && errno == EAGAIN) return; if (ret == -1) error(1, errno, "flush"); if (ret == 0) { /* client detached */ exit(0); } packets++; bytes += ret; } } static char sanitized_char(char val) { return (val >= 'a' && val <= 'z') ? val : '.'; } static void do_verify_udp(const char *data, int len) { char cur = data[0]; int i; /* verify contents */ if (cur < 'a' || cur > 'z') error(1, 0, "data initial byte out of range"); for (i = 1; i < len; i++) { if (cur == 'z') cur = 'a'; else cur++; if (data[i] != cur) error(1, 0, "data[%d]: len %d, %c(%hhu) != %c(%hhu)\n", i, len, sanitized_char(data[i]), data[i], sanitized_char(cur), cur); } } static int recv_msg(int fd, char *buf, int len, int *gso_size) { char control[CMSG_SPACE(sizeof(uint16_t))] = {0}; struct msghdr msg = {0}; struct iovec iov = {0}; struct cmsghdr *cmsg; uint16_t *gsosizeptr; int ret; iov.iov_base = buf; iov.iov_len = len; msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = control; msg.msg_controllen = sizeof(control); *gso_size = -1; ret = recvmsg(fd, &msg, MSG_TRUNC | MSG_DONTWAIT); if (ret != -1) { for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { if (cmsg->cmsg_level == SOL_UDP && cmsg->cmsg_type == UDP_GRO) { gsosizeptr = (uint16_t *) CMSG_DATA(cmsg); *gso_size = *gsosizeptr; break; } } } return ret; } /* Flush all outstanding datagrams. Verify first few bytes of each. */ static void do_flush_udp(int fd) { static char rbuf[ETH_MAX_MTU]; int ret, len, gso_size, budget = 256; len = cfg_read_all ? sizeof(rbuf) : 0; while (budget--) { /* MSG_TRUNC will make return value full datagram length */ if (!cfg_expected_gso_size) ret = recv(fd, rbuf, len, MSG_TRUNC | MSG_DONTWAIT); else ret = recv_msg(fd, rbuf, len, &gso_size); if (ret == -1 && errno == EAGAIN) break; if (ret == -1) error(1, errno, "recv"); if (cfg_expected_pkt_len && ret != cfg_expected_pkt_len) error(1, 0, "recv: bad packet len, got %d," " expected %d\n", ret, cfg_expected_pkt_len); if (len && cfg_verify) { if (ret == 0) error(1, errno, "recv: 0 byte datagram\n"); do_verify_udp(rbuf, ret); } if (cfg_expected_gso_size && cfg_expected_gso_size != gso_size) error(1, 0, "recv: bad gso size, got %d, expected %d " "(-1 == no gso cmsg))\n", gso_size, cfg_expected_gso_size); packets++; bytes += ret; if (cfg_expected_pkt_nr && packets >= cfg_expected_pkt_nr) break; } } static void usage(const char *filepath) { error(1, 0, "Usage: %s [-C connect_timeout] [-Grtv] [-b addr] [-p port]" " [-l pktlen] [-n packetnr] [-R rcv_timeout] [-S gsosize]", filepath); } static void parse_opts(int argc, char **argv) { const char *bind_addr = NULL; int c; while ((c = getopt(argc, argv, "4b:C:Gl:n:p:rR:S:tv")) != -1) { switch (c) { case '4': cfg_family = PF_INET; cfg_alen = sizeof(struct sockaddr_in); break; case 'b': bind_addr = optarg; break; case 'C': cfg_connect_timeout_ms = strtoul(optarg, NULL, 0); break; case 'G': cfg_gro_segment = true; break; case 'l': cfg_expected_pkt_len = strtoul(optarg, NULL, 0); break; case 'n': cfg_expected_pkt_nr = strtoul(optarg, NULL, 0); break; case 'p': cfg_port = strtoul(optarg, NULL, 0); break; case 'r': cfg_read_all = true; break; case 'R': cfg_rcv_timeout_ms = strtoul(optarg, NULL, 0); break; case 'S': cfg_expected_gso_size = strtol(optarg, NULL, 0); break; case 't': cfg_tcp = true; break; case 'v': cfg_verify = true; cfg_read_all = true; break; } } if (!bind_addr) bind_addr = cfg_family == PF_INET6 ? "::" : "0.0.0.0"; setup_sockaddr(cfg_family, bind_addr, &cfg_bind_addr); if (optind != argc) usage(argv[0]); if (cfg_tcp && cfg_verify) error(1, 0, "TODO: implement verify mode for tcp"); } static void do_recv(void) { int timeout_ms = cfg_tcp ? cfg_rcv_timeout_ms : cfg_connect_timeout_ms; unsigned long tnow, treport; int fd; fd = do_socket(cfg_tcp); if (cfg_gro_segment && !cfg_tcp) { int val = 1; if (setsockopt(fd, IPPROTO_UDP, UDP_GRO, &val, sizeof(val))) error(1, errno, "setsockopt UDP_GRO"); } treport = gettimeofday_ms() + 1000; do { do_poll(fd, timeout_ms); if (cfg_tcp) do_flush_tcp(fd); else do_flush_udp(fd); tnow = gettimeofday_ms(); if (tnow > treport) { if (packets) fprintf(stderr, "%s rx: %6lu MB/s %8lu calls/s\n", cfg_tcp ? "tcp" : "udp", bytes >> 20, packets); bytes = packets = 0; treport = tnow + 1000; } timeout_ms = cfg_rcv_timeout_ms; } while (!interrupted); if (cfg_expected_pkt_nr && (packets != cfg_expected_pkt_nr)) error(1, 0, "wrong packet number! got %ld, expected %d\n", packets, cfg_expected_pkt_nr); if (close(fd)) error(1, errno, "close"); } int main(int argc, char **argv) { parse_opts(argc, argv); signal(SIGINT, sigint_handler); do_recv(); return 0; } |