t_forward.c revision 314817 
1/*	$NetBSD: t_forward.c,v 1.10 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_forward.c,v 1.10 2017/01/13 21:30:42 christos Exp $");
33#endif /* not lint */
34
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <sys/time.h>
38#include <sys/sysctl.h>
39#include <sys/wait.h>
40
41#include <arpa/inet.h>
42
43#include <netinet/in.h>
44#include <netinet/in_systm.h>
45#include <netinet/ip.h>
46#include <netinet/ip_icmp.h>
47#include <netinet/icmp_var.h>
48#include <net/route.h>
49
50#include <rump/rump.h>
51#include <rump/rump_syscalls.h>
52
53#include <atf-c.h>
54#include <errno.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60#include "h_macros.h"
61#include "../config/netconfig.c"
62
63/*
64 * Since our maxttl is in our private namespace, we don't need raw packet
65 * construction like traceroute(8) -- we can just use the global maxttl.
66 */
67static void
68sendttl(void)
69{
70	struct sockaddr_in sin;
71	char payload[1024];
72	char ifname[IFNAMSIZ];
73	int mib[4] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DEFTTL };
74	int nv;
75	int s;
76
77	netcfg_rump_makeshmif("bus1", ifname);
78	netcfg_rump_if(ifname, "1.0.0.1", "255.255.255.0");
79	netcfg_rump_route("0.0.0.0", "0.0.0.0", "1.0.0.2"); /* default router */
80
81	/* set global ttl to 1 */
82	nv = 1;
83	if (rump_sys___sysctl(mib, 4, NULL, NULL, &nv, sizeof(nv)) == -1)
84		atf_tc_fail_errno("set ttl");
85
86	s = rump_sys_socket(PF_INET, SOCK_DGRAM, 0);
87	if (s == -1)
88		atf_tc_fail_errno("create send socket");
89
90	memset(&sin, 0, sizeof(sin));
91	sin.sin_len = sizeof(sin);
92	sin.sin_family = AF_INET;
93	sin.sin_port = htons(33434);
94	sin.sin_addr.s_addr = inet_addr("9.9.9.9");
95
96	/* send udp datagram with ttl == 1 */
97	if (rump_sys_sendto(s, payload, sizeof(payload), 0,
98	    (struct sockaddr *)&sin, sizeof(sin)) == -1)
99		atf_tc_fail_errno("sendto");
100}
101
102static void
103router(void)
104{
105	int mib[4] = { CTL_NET, PF_INET, IPPROTO_ICMP,
106		    ICMPCTL_RETURNDATABYTES };
107	char ifname[IFNAMSIZ];
108	int nv;
109
110	/* set returndatabytes to 200 */
111	nv = 200;
112	if (rump_sys___sysctl(mib, 4, NULL, NULL, &nv, sizeof(nv)) == -1)
113		atf_tc_fail_errno("sysctl returndatabytes");
114
115	netcfg_rump_makeshmif("bus1", ifname);
116	netcfg_rump_if(ifname, "1.0.0.2", "255.255.255.0");
117
118	/*
119	 * Wait for parent to send us the data and for us to have
120	 * a chance to process it.
121	 */
122	sleep(1);
123	exit(0);
124}
125
126ATF_TC(returndatabytes);
127ATF_TC_HEAD(returndatabytes, tc)
128{
129
130	atf_tc_set_md_var(tc, "descr", "icmp.returndatabytes with certain "
131	    "packets can cause kernel panic (PR kern/43548)");
132	atf_tc_set_md_var(tc, "timeout", "20"); /* just in case */
133}
134
135ATF_TC_BODY(returndatabytes, tc)
136{
137	pid_t cpid;
138	int status;
139
140	cpid = fork();
141	rump_init();
142
143	switch (cpid) {
144	case -1:
145		atf_tc_fail_errno("fork failed");
146	case 0:
147		router();
148		break;
149	default:
150		sendttl();
151		if (wait(&status) == -1)
152			atf_tc_fail_errno("wait");
153		if (WIFEXITED(status)) {
154			if (WEXITSTATUS(status))
155				atf_tc_fail("child exited with status %d",
156				    WEXITSTATUS(status));
157		} else {
158			atf_tc_fail("child died");
159		}
160	}
161}
162
163ATF_TP_ADD_TCS(tp)
164{
165
166	ATF_TP_ADD_TC(tp, returndatabytes);
167
168	return atf_no_error();
169}
170