tests/net/icmp/t_ping.c

   1 /*      $NetBSD: t_ping.c,v 1.16 2015/02/26 13:06:10 martin Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #ifndef lint
  32 __RCSID("$NetBSD: t_ping.c,v 1.16 2015/02/26 13:06:10 martin Exp $");
  33 #endif /* not lint */
  34
  35 #include <sys/types.h>
  36 #include <sys/resource.h>
  37 #include <sys/sysctl.h>
  38 #include <sys/wait.h>
  39
  40 #include <atf-c.h>
  41 #include <assert.h>
  42 #include <fcntl.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <signal.h>
  48
  49 #include <netinet/in.h>
  50 #include <netinet/ip_var.h>
  51
  52 #include <rump/rump.h>
  53 #include <rump/rump_syscalls.h>
  54
  55 #include "../../h_macros.h"
  56 #include "../config/netconfig.c"
  57
  58 ATF_TC(simpleping);
  59 ATF_TC_HEAD(simpleping, tc)
  60 {
  61
  62         atf_tc_set_md_var(tc, "descr", "check that kernel responds to ping");
  63         atf_tc_set_md_var(tc, "timeout", "20");
  64 }
  65
  66 ATF_TC_BODY(simpleping, tc)
  67 {
  68         char ifname[IFNAMSIZ];
  69         pid_t cpid;
  70         bool win, win2;
  71         char token;
  72         int channel[2];
  73
  74         RL(pipe(channel));
  75
  76         cpid = fork();
  77         rump_init();
  78         netcfg_rump_makeshmif("but-can-i-buy-your-ether-bus", ifname);
  79
  80         switch (cpid) {
  81         case -1:
  82                 atf_tc_fail_errno("fork failed");
  83         case 0:
  84                 netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
  85                 close(channel[0]);
  86                 ATF_CHECK(write(channel[1], "U", 1) == 1);
  87                 close(channel[1]);
  88                 pause();
  89                 break;
  90         default:
  91                 break;
  92         }
  93
  94         close(channel[1]);
  95         ATF_CHECK(read(channel[0], &token, 1) == 1 && token == 'U');
  96         close(channel[0]);
  97
  98         netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
  99
 100         /*
 101          * The beauty of shmif is that we don't have races here.
 102          */
 103         win = netcfg_rump_pingtest("1.1.1.10", 500);
 104         win2 = netcfg_rump_pingtest("1.1.1.30", 500);
 105
 106         kill(cpid, SIGKILL);
 107
 108         if (!win)
 109                 atf_tc_fail("ping failed");
 110         if (win2)
 111                 atf_tc_fail("non-existent host responded");
 112 }
 113
 114 ATF_TC(floodping);
 115 ATF_TC_HEAD(floodping, tc)
 116 {
 117
 118         atf_tc_set_md_var(tc, "descr", "see how kernel responds to floodping");
 119 }
 120
 121 /* why the hell isn't this available in userspace??? */
 122 static uint16_t
 123 in_cksum(void *data, size_t len)
 124 {
 125         uint16_t *buf = data;
 126         unsigned sum;
 127
 128         for (sum = 0; len > 1; len -= 2)
 129                 sum += *buf++;
 130         if (len)
 131                 sum += *(uint8_t *)buf;
 132
 133         sum = (sum >> 16) + (sum & 0xffff);
 134         sum += (sum >> 16);
 135
 136         return ~sum;
 137 }
 138
 139 static int
 140 doping(const char *target, int loops, u_int pktsize)
 141 {
 142         union {
 143                 char buf[IP_MAXPACKET - sizeof(struct ip)];
 144                 struct icmp i;  /* ensure proper alignment */
 145         } sndbuf;
 146         char recvbuf[IP_MAXPACKET];
 147         struct sockaddr_in dst, pingee;
 148         struct icmp *icmp;
 149         socklen_t slen;
 150         ssize_t n;
 151         int loop, succ;
 152         int x, xnon, s;
 153
 154         RL(s = rump_sys_socket(PF_INET, SOCK_RAW, IPPROTO_ICMP));
 155         RL(x = rump_sys_fcntl(s, F_GETFL, 0));
 156         xnon = x | O_NONBLOCK;
 157
 158         memset(&dst, 0, sizeof(dst));
 159         dst.sin_len = sizeof(dst);
 160         dst.sin_family = AF_INET;
 161         dst.sin_addr.s_addr = inet_addr(target);
 162
 163         icmp = (struct icmp *)&sndbuf;
 164         memset(icmp, 0, sizeof(*icmp));
 165         icmp->icmp_type = ICMP_ECHO;
 166         icmp->icmp_id = htons(37);
 167
 168         if (pktsize < sizeof(*icmp))
 169                 pktsize = sizeof(*icmp);
 170         if (pktsize > sizeof(sndbuf.buf))
 171                 pktsize = sizeof(sndbuf.buf);
 172
 173         RL(rump_sys_setsockopt(s, SOL_SOCKET, SO_SNDBUF,
 174             &pktsize, sizeof(pktsize)));
 175         RL(rump_sys_setsockopt(s, SOL_SOCKET, SO_RCVBUF,
 176             &pktsize, sizeof(pktsize)));
 177
 178         slen = sizeof(pingee);
 179         succ = 0;
 180         for (loop = 0; loop < loops; loop++) {
 181                 RL(rump_sys_fcntl(s, F_SETFL, x));
 182                 icmp->icmp_seq = htons(loop);
 183                 icmp->icmp_cksum = 0;
 184                 icmp->icmp_cksum = in_cksum(icmp, pktsize);
 185                 RL(rump_sys_sendto(s, icmp, pktsize, 0,
 186                     (struct sockaddr *)&dst, sizeof(dst)));
 187
 188                 RL(rump_sys_fcntl(s, F_SETFL, xnon));
 189                 while ((n = rump_sys_recvfrom(s, recvbuf, sizeof(recvbuf), 0,
 190                     (struct sockaddr *)&pingee, &slen)) > 0) {
 191                         succ++;
 192                 }
 193                 if (n == -1 && errno == EAGAIN)
 194                         continue;
 195                 atf_tc_fail_errno("recv failed");
 196         }
 197
 198         rump_sys_close(s);
 199         return succ;
 200 }
 201
 202 #define LOOPS 10000
 203
 204 ATF_TC_BODY(floodping, tc)
 205 {
 206         char ifname[IFNAMSIZ];
 207         pid_t cpid;
 208         int succ;
 209
 210         cpid = fork();
 211         rump_init();
 212         netcfg_rump_makeshmif("thank-you-driver-for-getting-me-here", ifname);
 213
 214         switch (cpid) {
 215         case -1:
 216                 atf_tc_fail_errno("fork failed");
 217         case 0:
 218                 netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
 219                 pause();
 220                 break;
 221         default:
 222                 break;
 223         }
 224
 225         netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
 226
 227         succ = doping("1.1.1.10", LOOPS, 56);
 228         printf("got %d/%d\n", succ, LOOPS);
 229
 230         kill(cpid, SIGKILL);
 231 }
 232
 233 ATF_TC(floodping2);
 234 ATF_TC_HEAD(floodping2, tc)
 235 {
 236
 237         atf_tc_set_md_var(tc, "descr", "two hosts floodpinging each other");
 238 }
 239
 240 ATF_TC_BODY(floodping2, tc)
 241 {
 242         char ifname[IFNAMSIZ];
 243         pid_t cpid;
 244         int succ;
 245
 246         cpid = fork();
 247         rump_init();
 248         netcfg_rump_makeshmif("floodping2", ifname);
 249
 250         switch (cpid) {
 251         case -1:
 252                 atf_tc_fail_errno("fork failed");
 253         case 0:
 254                 netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
 255                 succ = doping("1.1.1.20", LOOPS, 56);
 256                 break;
 257         default:
 258                 netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
 259                 succ = doping("1.1.1.10", LOOPS, 56);
 260                 break;
 261         }
 262
 263         printf("got %d/%d\n", succ, LOOPS);
 264 }
 265
 266 ATF_TC(pingsize);
 267 ATF_TC_HEAD(pingsize, tc)
 268 {
 269
 270         atf_tc_set_md_var(tc, "descr", "ping with packets min <= size <= max");
 271 }
 272
 273 ATF_TC_BODY(pingsize, tc)
 274 {
 275         char ifname[IFNAMSIZ];
 276         pid_t cpid;
 277         int succ, i;
 278
 279         cpid = fork();
 280         rump_init();
 281         netcfg_rump_makeshmif("jippikaiee", ifname);
 282
 283         switch (cpid) {
 284         case -1:
 285                 atf_tc_fail_errno("fork failed");
 286         case 0:
 287                 netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
 288                 pause();
 289                 break;
 290         default:
 291                 break;
 292         }
 293
 294         netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
 295
 296         succ = 0;
 297
 298         /* small sizes */
 299         for (i = 0 ; i < IP_MAXPACKET - 60000; i++)
 300                 succ += doping("1.1.1.10", 1, i);
 301
 302         /* medium sizes */
 303         for (i = IP_MAXPACKET - 60000; i < IP_MAXPACKET - 100; i += 1000)
 304                 succ += doping("1.1.1.10", 1, i);
 305
 306         /* big sizes */
 307         for (i = IP_MAXPACKET - 100; i < IP_MAXPACKET; i += 10)
 308                 succ += doping("1.1.1.10", 1, i);
 309
 310         printf("got %d/%d\n", succ, IP_MAXPACKET);
 311         kill(cpid, SIGKILL);
 312 }
 313
 314 ATF_TC(ping_of_death);
 315 ATF_TC_HEAD(ping_of_death, tc)
 316 {
 317
 318         atf_tc_set_md_var(tc, "descr", "send a \"ping of death\"");
 319         atf_tc_set_md_var(tc, "timeout", "20");
 320 }
 321
 322 ATF_TC_BODY(ping_of_death, tc)
 323 {
 324         char data[1500];
 325         struct sockaddr_in dst;
 326         struct ip *ip;
 327         struct icmp *icmp;
 328         char ifname[IFNAMSIZ];
 329         pid_t cpid;
 330         size_t tot, frag;
 331         int s, x, loop;
 332
 333         cpid = fork();
 334         rump_init();
 335         netcfg_rump_makeshmif("jippikaiee", ifname);
 336
 337         switch (cpid) {
 338         case -1:
 339                 atf_tc_fail_errno("fork failed");
 340         case 0:
 341                 /* wait until we receive a too long IP packet */
 342                 for (loop = 0;; loop++) {
 343                         uint64_t ipstat[IP_NSTATS];
 344                         size_t arglen;
 345                         int mib[4];
 346
 347                         if (loop == 1)
 348                                 netcfg_rump_if(ifname,
 349                                     "1.1.1.10", "255.255.255.0");
 350
 351                         mib[0] = CTL_NET;
 352                         mib[1] = PF_INET;
 353                         mib[2] = IPPROTO_IP;
 354                         mib[3] = IPCTL_STATS;
 355
 356                         arglen = sizeof(ipstat);
 357                         RL(rump_sys___sysctl(mib, 4, &ipstat, &arglen,
 358                             NULL, 0));
 359                         if (loop == 0 && ipstat[IP_STAT_TOOLONG] != 0)
 360                                 _exit(1);
 361                         if (ipstat[IP_STAT_TOOLONG])
 362                                 break;
 363                         usleep(10000);
 364                 }
 365
 366                 _exit(0);
 367                 break;
 368         default:
 369                 break;
 370         }
 371
 372         netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
 373
 374         RL(s = rump_sys_socket(PF_INET, SOCK_RAW, 0));
 375         x = 1;
 376         RL(rump_sys_setsockopt(s, IPPROTO_IP, IP_HDRINCL, &x, sizeof(x)));
 377
 378         memset(&dst, 0, sizeof(dst));
 379         dst.sin_len = sizeof(dst);
 380         dst.sin_family = AF_INET;
 381         dst.sin_addr.s_addr = inet_addr("1.1.1.10");
 382
 383         /* construct packet */
 384         memset(data, 0, sizeof(data));
 385         ip = (struct ip *)data;
 386         ip->ip_v = 4;
 387         ip->ip_hl = sizeof(*ip) >> 2;
 388         ip->ip_p = IPPROTO_ICMP;
 389         ip->ip_ttl = IPDEFTTL;
 390         ip->ip_dst = dst.sin_addr;
 391         ip->ip_id = 1234;
 392
 393         icmp = (struct icmp *)(ip + 1);
 394         icmp->icmp_type = ICMP_ECHO;
 395         icmp->icmp_cksum = in_cksum(icmp, sizeof(*icmp));
 396
 397         for (;;) {
 398                 int status;
 399
 400                 /* resolve arp before sending raw stuff */
 401                 netcfg_rump_pingtest("1.1.1.10", 1);
 402
 403                 for (tot = 0;
 404                     tot < 65538 - sizeof(*ip);
 405                     tot += (frag - sizeof(*ip))) {
 406                         frag = MIN(65538 - tot, sizeof(data));
 407                         ip->ip_off = tot >> 3;
 408                         assert((size_t)ip->ip_off << 3 == tot);
 409                         ip->ip_len = frag;
 410
 411                         if (frag == sizeof(data)) {
 412                                 ip->ip_off |= IP_MF;
 413                         }
 414
 415                         RL(rump_sys_sendto(s, data, frag, 0,
 416                             (struct sockaddr *)&dst, sizeof(dst)));
 417                 }
 418                 if (waitpid(-1, &status, WNOHANG) > 0) {
 419                         if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
 420                                 break;
 421                         atf_tc_fail("child did not exit clean");
 422                 }
 423
 424                 usleep(10000);
 425         }
 426 }
 427
 428 ATF_TP_ADD_TCS(tp)
 429 {
 430
 431         ATF_TP_ADD_TC(tp, simpleping);
 432         ATF_TP_ADD_TC(tp, floodping);
 433         ATF_TP_ADD_TC(tp, floodping2);
 434         ATF_TP_ADD_TC(tp, pingsize);
 435         ATF_TP_ADD_TC(tp, ping_of_death);
 436
 437         return atf_no_error();
 438 }