1 /* 2 * tcp_metrics.c "ip tcp_metrics/tcpmetrics" 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * version 2 as published by the Free Software Foundation; 7 * 8 * Authors: Julian Anastasov <ja (at) ssi.bg>, August 2012 9 */ 10 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <unistd.h> 15 #include <errno.h> 16 #include <sys/types.h> 17 #include <sys/socket.h> 18 #include <arpa/inet.h> 19 #include <sys/ioctl.h> 20 #include <linux/if.h> 21 22 #include <linux/genetlink.h> 23 #include <linux/tcp_metrics.h> 24 25 #include "utils.h" 26 #include "ip_common.h" 27 #include "libgenl.h" 28 29 static void usage(void) 30 { 31 fprintf(stderr, "Usage: ip tcp_metrics/tcpmetrics { COMMAND | help }\n"); 32 fprintf(stderr, " ip tcp_metrics { show | flush } SELECTOR\n"); 33 fprintf(stderr, " ip tcp_metrics delete [ address ] ADDRESS\n"); 34 fprintf(stderr, "SELECTOR := [ [ address ] PREFIX ]\n"); 35 exit(-1); 36 } 37 38 /* netlink socket */ 39 static struct rtnl_handle grth = { .fd = -1 }; 40 static int genl_family = -1; 41 42 #define TCPM_REQUEST(_req, _bufsiz, _cmd, _flags) \ 43 GENL_REQUEST(_req, _bufsiz, genl_family, 0, \ 44 TCP_METRICS_GENL_VERSION, _cmd, _flags) 45 46 #define CMD_LIST 0x0001 /* list, lst, show */ 47 #define CMD_DEL 0x0002 /* delete, remove */ 48 #define CMD_FLUSH 0x0004 /* flush */ 49 50 static struct { 51 char *name; 52 int code; 53 } cmds[] = { 54 { "list", CMD_LIST }, 55 { "lst", CMD_LIST }, 56 { "show", CMD_LIST }, 57 { "delete", CMD_DEL }, 58 { "remove", CMD_DEL }, 59 { "flush", CMD_FLUSH }, 60 }; 61 62 static char *metric_name[TCP_METRIC_MAX + 1] = { 63 [TCP_METRIC_RTT] = "rtt", 64 [TCP_METRIC_RTTVAR] = "rttvar", 65 [TCP_METRIC_SSTHRESH] = "ssthresh", 66 [TCP_METRIC_CWND] = "cwnd", 67 [TCP_METRIC_REORDERING] = "reordering", 68 }; 69 70 static struct 71 { 72 int flushed; 73 char *flushb; 74 int flushp; 75 int flushe; 76 int cmd; 77 inet_prefix daddr; 78 inet_prefix saddr; 79 } f; 80 81 static int flush_update(void) 82 { 83 if (rtnl_send_check(&grth, f.flushb, f.flushp) < 0) { 84 perror("Failed to send flush request\n"); 85 return -1; 86 } 87 f.flushp = 0; 88 return 0; 89 } 90 91 static int process_msg(const struct sockaddr_nl *who, struct nlmsghdr *n, 92 void *arg) 93 { 94 FILE *fp = (FILE *) arg; 95 struct genlmsghdr *ghdr; 96 struct rtattr *attrs[TCP_METRICS_ATTR_MAX + 1], *a; 97 int len = n->nlmsg_len; 98 inet_prefix daddr, saddr; 99 int family, i, atype, stype, dlen = 0, slen = 0; 100 101 if (n->nlmsg_type != genl_family) 102 return -1; 103 104 len -= NLMSG_LENGTH(GENL_HDRLEN); 105 if (len < 0) 106 return -1; 107 108 ghdr = NLMSG_DATA(n); 109 if (ghdr->cmd != TCP_METRICS_CMD_GET) 110 return 0; 111 112 parse_rtattr(attrs, TCP_METRICS_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, 113 len); 114 115 if (attrs[TCP_METRICS_ATTR_ADDR_IPV4]) { 116 if (f.daddr.family && f.daddr.family != AF_INET) 117 return 0; 118 a = attrs[TCP_METRICS_ATTR_ADDR_IPV4]; 119 memcpy(&daddr.data, RTA_DATA(a), 4); 120 daddr.bytelen = 4; 121 family = AF_INET; 122 atype = TCP_METRICS_ATTR_ADDR_IPV4; 123 dlen = RTA_PAYLOAD(a); 124 } else if (attrs[TCP_METRICS_ATTR_ADDR_IPV6]) { 125 if (f.daddr.family && f.daddr.family != AF_INET6) 126 return 0; 127 a = attrs[TCP_METRICS_ATTR_ADDR_IPV6]; 128 memcpy(&daddr.data, RTA_DATA(a), 16); 129 daddr.bytelen = 16; 130 family = AF_INET6; 131 atype = TCP_METRICS_ATTR_ADDR_IPV6; 132 dlen = RTA_PAYLOAD(a); 133 } else { 134 return 0; 135 } 136 137 if (attrs[TCP_METRICS_ATTR_SADDR_IPV4]) { 138 if (f.saddr.family && f.saddr.family != AF_INET) 139 return 0; 140 a = attrs[TCP_METRICS_ATTR_SADDR_IPV4]; 141 memcpy(&saddr.data, RTA_DATA(a), 4); 142 saddr.bytelen = 4; 143 stype = TCP_METRICS_ATTR_SADDR_IPV4; 144 slen = RTA_PAYLOAD(a); 145 } else if (attrs[TCP_METRICS_ATTR_SADDR_IPV6]) { 146 if (f.saddr.family && f.saddr.family != AF_INET6) 147 return 0; 148 a = attrs[TCP_METRICS_ATTR_SADDR_IPV6]; 149 memcpy(&saddr.data, RTA_DATA(a), 16); 150 saddr.bytelen = 16; 151 stype = TCP_METRICS_ATTR_SADDR_IPV6; 152 slen = RTA_PAYLOAD(a); 153 } 154 155 if (f.daddr.family && f.daddr.bitlen >= 0 && 156 inet_addr_match(&daddr, &f.daddr, f.daddr.bitlen)) 157 return 0; 158 /* Only check for the source-address if the kernel supports it, 159 * meaning slen != 0. 160 */ 161 if (slen && f.saddr.family && f.saddr.bitlen >= 0 && 162 inet_addr_match(&saddr, &f.saddr, f.saddr.bitlen)) 163 return 0; 164 165 if (f.flushb) { 166 struct nlmsghdr *fn; 167 168 TCPM_REQUEST(req2, 128, TCP_METRICS_CMD_DEL, NLM_F_REQUEST); 169 170 addattr_l(&req2.n, sizeof(req2), atype, &daddr.data, 171 daddr.bytelen); 172 if (slen) 173 addattr_l(&req2.n, sizeof(req2), stype, &saddr.data, 174 saddr.bytelen); 175 176 if (NLMSG_ALIGN(f.flushp) + req2.n.nlmsg_len > f.flushe) { 177 if (flush_update()) 178 return -1; 179 } 180 fn = (struct nlmsghdr *) (f.flushb + NLMSG_ALIGN(f.flushp)); 181 memcpy(fn, &req2.n, req2.n.nlmsg_len); 182 fn->nlmsg_seq = ++grth.seq; 183 f.flushp = (((char *) fn) + req2.n.nlmsg_len) - f.flushb; 184 f.flushed++; 185 if (show_stats < 2) 186 return 0; 187 } 188 189 if (f.cmd & (CMD_DEL | CMD_FLUSH)) 190 fprintf(fp, "Deleted "); 191 192 fprintf(fp, "%s", 193 format_host(family, dlen, &daddr.data)); 194 195 a = attrs[TCP_METRICS_ATTR_AGE]; 196 if (a) { 197 unsigned long long val = rta_getattr_u64(a); 198 199 fprintf(fp, " age %llu.%03llusec", 200 val / 1000, val % 1000); 201 } 202 203 a = attrs[TCP_METRICS_ATTR_TW_TS_STAMP]; 204 if (a) { 205 __s32 val = (__s32) rta_getattr_u32(a); 206 __u32 tsval; 207 208 a = attrs[TCP_METRICS_ATTR_TW_TSVAL]; 209 tsval = a ? rta_getattr_u32(a) : 0; 210 fprintf(fp, " tw_ts %u/%dsec ago", tsval, val); 211 } 212 213 a = attrs[TCP_METRICS_ATTR_VALS]; 214 if (a) { 215 struct rtattr *m[TCP_METRIC_MAX + 1 + 1]; 216 unsigned long rtt = 0, rttvar = 0; 217 218 parse_rtattr_nested(m, TCP_METRIC_MAX + 1, a); 219 220 for (i = 0; i < TCP_METRIC_MAX + 1; i++) { 221 unsigned long val; 222 223 a = m[i + 1]; 224 if (!a) 225 continue; 226 if (i != TCP_METRIC_RTT && 227 i != TCP_METRIC_RTT_US && 228 i != TCP_METRIC_RTTVAR && 229 i != TCP_METRIC_RTTVAR_US) { 230 if (metric_name[i]) 231 fprintf(fp, " %s ", metric_name[i]); 232 else 233 fprintf(fp, " metric_%d ", i); 234 } 235 val = rta_getattr_u32(a); 236 switch (i) { 237 case TCP_METRIC_RTT: 238 if (!rtt) 239 rtt = (val * 1000UL) >> 3; 240 break; 241 case TCP_METRIC_RTTVAR: 242 if (!rttvar) 243 rttvar = (val * 1000UL) >> 2; 244 break; 245 case TCP_METRIC_RTT_US: 246 rtt = val >> 3; 247 break; 248 case TCP_METRIC_RTTVAR_US: 249 rttvar = val >> 2; 250 break; 251 case TCP_METRIC_SSTHRESH: 252 case TCP_METRIC_CWND: 253 case TCP_METRIC_REORDERING: 254 default: 255 fprintf(fp, "%lu", val); 256 break; 257 } 258 } 259 if (rtt) 260 fprintf(fp, " rtt %luus", rtt); 261 if (rttvar) 262 fprintf(fp, " rttvar %luus", rttvar); 263 } 264 265 a = attrs[TCP_METRICS_ATTR_FOPEN_MSS]; 266 if (a) 267 fprintf(fp, " fo_mss %u", rta_getattr_u16(a)); 268 269 a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROPS]; 270 if (a) { 271 __u16 syn_loss = rta_getattr_u16(a); 272 unsigned long long ts; 273 274 a = attrs[TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS]; 275 ts = a ? rta_getattr_u64(a) : 0; 276 277 fprintf(fp, " fo_syn_drops %u/%llu.%03llusec ago", 278 syn_loss, ts / 1000, ts % 1000); 279 } 280 281 a = attrs[TCP_METRICS_ATTR_FOPEN_COOKIE]; 282 if (a) { 283 char cookie[32 + 1]; 284 unsigned char *ptr = RTA_DATA(a); 285 int i, max = RTA_PAYLOAD(a); 286 287 if (max > 16) 288 max = 16; 289 cookie[0] = 0; 290 for (i = 0; i < max; i++) 291 sprintf(cookie + i + i, "%02x", ptr[i]); 292 fprintf(fp, " fo_cookie %s", cookie); 293 } 294 295 if (slen) { 296 fprintf(fp, " source %s", 297 format_host(family, slen, &saddr.data)); 298 } 299 300 fprintf(fp, "\n"); 301 302 fflush(fp); 303 return 0; 304 } 305 306 static int tcpm_do_cmd(int cmd, int argc, char **argv) 307 { 308 TCPM_REQUEST(req, 1024, TCP_METRICS_CMD_GET, NLM_F_REQUEST); 309 int atype = -1, stype = -1; 310 int ack; 311 312 memset(&f, 0, sizeof(f)); 313 f.daddr.bitlen = -1; 314 f.daddr.family = preferred_family; 315 f.saddr.bitlen = -1; 316 f.saddr.family = preferred_family; 317 318 switch (preferred_family) { 319 case AF_UNSPEC: 320 case AF_INET: 321 case AF_INET6: 322 break; 323 default: 324 fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family); 325 return -1; 326 } 327 328 for (; argc > 0; argc--, argv++) { 329 if (strcmp(*argv, "src") == 0 || 330 strcmp(*argv, "source") == 0) { 331 char *who = *argv; 332 333 NEXT_ARG(); 334 if (matches(*argv, "help") == 0) 335 usage(); 336 if (f.saddr.bitlen >= 0) 337 duparg2(who, *argv); 338 339 get_prefix(&f.saddr, *argv, preferred_family); 340 if (f.saddr.bytelen && f.saddr.bytelen * 8 == f.saddr.bitlen) { 341 if (f.saddr.family == AF_INET) 342 stype = TCP_METRICS_ATTR_SADDR_IPV4; 343 else if (f.saddr.family == AF_INET6) 344 stype = TCP_METRICS_ATTR_SADDR_IPV6; 345 } 346 347 if (stype < 0) { 348 fprintf(stderr, "Error: a specific IP address is expected rather than \"%s\"\n", 349 *argv); 350 return -1; 351 } 352 } else { 353 char *who = "address"; 354 355 if (strcmp(*argv, "addr") == 0 || 356 strcmp(*argv, "address") == 0) { 357 who = *argv; 358 NEXT_ARG(); 359 } 360 if (matches(*argv, "help") == 0) 361 usage(); 362 if (f.daddr.bitlen >= 0) 363 duparg2(who, *argv); 364 365 get_prefix(&f.daddr, *argv, preferred_family); 366 if (f.daddr.bytelen && f.daddr.bytelen * 8 == f.daddr.bitlen) { 367 if (f.daddr.family == AF_INET) 368 atype = TCP_METRICS_ATTR_ADDR_IPV4; 369 else if (f.daddr.family == AF_INET6) 370 atype = TCP_METRICS_ATTR_ADDR_IPV6; 371 } 372 if ((CMD_DEL & cmd) && atype < 0) { 373 fprintf(stderr, "Error: a specific IP address is expected rather than \"%s\"\n", 374 *argv); 375 return -1; 376 } 377 } 378 argc--; argv++; 379 } 380 381 if (cmd == CMD_DEL && atype < 0) 382 missarg("address"); 383 384 /* flush for exact address ? Single del */ 385 if (cmd == CMD_FLUSH && atype >= 0) 386 cmd = CMD_DEL; 387 388 /* flush for all addresses ? Single del without address */ 389 if (cmd == CMD_FLUSH && f.daddr.bitlen <= 0 && 390 f.saddr.bitlen <= 0 && preferred_family == AF_UNSPEC) { 391 cmd = CMD_DEL; 392 req.g.cmd = TCP_METRICS_CMD_DEL; 393 ack = 1; 394 } else if (cmd == CMD_DEL) { 395 req.g.cmd = TCP_METRICS_CMD_DEL; 396 ack = 1; 397 } else { /* CMD_FLUSH, CMD_LIST */ 398 ack = 0; 399 } 400 401 if (genl_init_handle(&grth, TCP_METRICS_GENL_NAME, &genl_family)) 402 exit(1); 403 req.n.nlmsg_type = genl_family; 404 405 if (!(cmd & CMD_FLUSH) && (atype >= 0 || (cmd & CMD_DEL))) { 406 if (ack) 407 req.n.nlmsg_flags |= NLM_F_ACK; 408 if (atype >= 0) 409 addattr_l(&req.n, sizeof(req), atype, &f.daddr.data, 410 f.daddr.bytelen); 411 if (stype >= 0) 412 addattr_l(&req.n, sizeof(req), stype, &f.saddr.data, 413 f.saddr.bytelen); 414 } else { 415 req.n.nlmsg_flags |= NLM_F_DUMP; 416 } 417 418 f.cmd = cmd; 419 if (cmd & CMD_FLUSH) { 420 int round = 0; 421 char flushb[4096-512]; 422 423 f.flushb = flushb; 424 f.flushp = 0; 425 f.flushe = sizeof(flushb); 426 427 for (;;) { 428 req.n.nlmsg_seq = grth.dump = ++grth.seq; 429 if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) { 430 perror("Failed to send flush request"); 431 exit(1); 432 } 433 f.flushed = 0; 434 if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) { 435 fprintf(stderr, "Flush terminated\n"); 436 exit(1); 437 } 438 if (f.flushed == 0) { 439 if (round == 0) { 440 fprintf(stderr, "Nothing to flush.\n"); 441 } else if (show_stats) 442 printf("*** Flush is complete after %d round%s ***\n", 443 round, round > 1 ? "s" : ""); 444 fflush(stdout); 445 return 0; 446 } 447 round++; 448 if (flush_update() < 0) 449 exit(1); 450 if (show_stats) { 451 printf("\n*** Round %d, deleting %d entries ***\n", 452 round, f.flushed); 453 fflush(stdout); 454 } 455 } 456 return 0; 457 } 458 459 if (ack) { 460 if (rtnl_talk(&grth, &req.n, NULL, 0) < 0) 461 return -2; 462 } else if (atype >= 0) { 463 if (rtnl_talk(&grth, &req.n, &req.n, sizeof(req)) < 0) 464 return -2; 465 if (process_msg(NULL, &req.n, stdout) < 0) { 466 fprintf(stderr, "Dump terminated\n"); 467 exit(1); 468 } 469 } else { 470 req.n.nlmsg_seq = grth.dump = ++grth.seq; 471 if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) { 472 perror("Failed to send dump request"); 473 exit(1); 474 } 475 476 if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) { 477 fprintf(stderr, "Dump terminated\n"); 478 exit(1); 479 } 480 } 481 return 0; 482 } 483 484 int do_tcp_metrics(int argc, char **argv) 485 { 486 int i; 487 488 if (argc < 1) 489 return tcpm_do_cmd(CMD_LIST, 0, NULL); 490 for (i = 0; i < ARRAY_SIZE(cmds); i++) { 491 if (matches(argv[0], cmds[i].name) == 0) 492 return tcpm_do_cmd(cmds[i].code, argc-1, argv+1); 493 } 494 if (matches(argv[0], "help") == 0) 495 usage(); 496 497 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tcp_metrics help\".\n", 498 *argv); 499 exit(-1); 500 } 501
