1 /* $NetBSD: t_ping.c,v 1.17 2017/01/13 21:30:42 christos 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 1.17 2017/01/13 21:30:42 christos 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);
ATF_TC_HEAD(simpleping,tc)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
ATF_TC_BODY(simpleping,tc)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);
ATF_TC_HEAD(floodping,tc)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
in_cksum(void * data,size_t len)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
doping(const char * target,int loops,u_int pktsize)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
ATF_TC_BODY(floodping,tc)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);
ATF_TC_HEAD(floodping2,tc)234 ATF_TC_HEAD(floodping2, tc)
235 {
236
237 atf_tc_set_md_var(tc, "descr", "two hosts floodpinging each other");
238 }
239
ATF_TC_BODY(floodping2,tc)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);
ATF_TC_HEAD(pingsize,tc)267 ATF_TC_HEAD(pingsize, tc)
268 {
269
270 atf_tc_set_md_var(tc, "descr", "ping with packets min <= size <= max");
271 }
272
ATF_TC_BODY(pingsize,tc)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);
ATF_TC_HEAD(ping_of_death,tc)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
ATF_TC_BODY(ping_of_death,tc)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
ATF_TP_ADD_TCS(tp)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 }
439