/* $NetBSD: t_ping.c,v 1.24 2019/06/11 08:34:01 gson Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: t_ping.c,v 1.24 2019/06/11 08:34:01 gson Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <atf-c.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include "h_macros.h"
#include "../config/netconfig.c"
ATF_TC(simpleping);
ATF_TC_HEAD(simpleping, tc)
{
atf_tc_set_md_var(tc, "descr", "check that kernel responds to ping");
atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(simpleping, tc)
{
char ifname[IFNAMSIZ];
pid_t cpid;
bool win, win2;
char token;
int channel[2];
RL(pipe(channel));
cpid = fork();
rump_init();
netcfg_rump_makeshmif("but-can-i-buy-your-ether-bus", ifname);
switch (cpid) {
case -1:
atf_tc_fail_errno("fork failed");
case 0:
netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
close(channel[0]);
ATF_CHECK(write(channel[1], "U", 1) == 1);
close(channel[1]);
pause();
break;
default:
break;
}
close(channel[1]);
ATF_CHECK(read(channel[0], &token, 1) == 1 && token == 'U');
close(channel[0]);
netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
/*
* The beauty of shmif is that we don't have races here.
*/
win = netcfg_rump_pingtest("1.1.1.10", 500);
win2 = netcfg_rump_pingtest("1.1.1.30", 500);
kill(cpid, SIGKILL);
if (!win)
atf_tc_fail("ping failed");
if (win2)
atf_tc_fail("non-existent host responded");
}
ATF_TC(floodping);
ATF_TC_HEAD(floodping, tc)
{
atf_tc_set_md_var(tc, "descr", "see how kernel responds to floodping");
}
/* why the hell isn't this available in userspace??? */
static uint16_t
in_cksum(void *data, size_t len)
{
uint16_t *buf = data;
unsigned sum;
for (sum = 0; len > 1; len -= 2)
sum += *buf++;
if (len)
sum += *(uint8_t *)buf;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return ~sum;
}
static int
doping(const char *target, int loops, u_int pktsize)
{
union {
char buf[IP_MAXPACKET - sizeof(struct ip)];
struct icmp i; /* ensure proper alignment */
} sndbuf;
char recvbuf[IP_MAXPACKET];
struct sockaddr_in dst, pingee;
struct icmp *icmp;
socklen_t slen;
ssize_t n;
int loop, succ;
int x, xnon, s;
RL(s = rump_sys_socket(PF_INET, SOCK_RAW, IPPROTO_ICMP));
RL(x = rump_sys_fcntl(s, F_GETFL, 0));
xnon = x | O_NONBLOCK;
memset(&dst, 0, sizeof(dst));
dst.sin_len = sizeof(dst);
dst.sin_family = AF_INET;
dst.sin_addr.s_addr = inet_addr(target);
icmp = (struct icmp *)&sndbuf;
memset(icmp, 0, sizeof(*icmp));
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_id = htons(37);
if (pktsize < sizeof(*icmp))
pktsize = sizeof(*icmp);
if (pktsize > sizeof(sndbuf.buf))
pktsize = sizeof(sndbuf.buf);
RL(rump_sys_setsockopt(s, SOL_SOCKET, SO_SNDBUF,
&pktsize, sizeof(pktsize)));
RL(rump_sys_setsockopt(s, SOL_SOCKET, SO_RCVBUF,
&pktsize, sizeof(pktsize)));
slen = sizeof(pingee);
succ = 0;
for (loop = 0; loop < loops; loop++) {
RL(rump_sys_fcntl(s, F_SETFL, x));
icmp->icmp_seq = htons(loop);
icmp->icmp_cksum = 0;
icmp->icmp_cksum = in_cksum(icmp, pktsize);
n = rump_sys_sendto(s, icmp, pktsize, 0,
(struct sockaddr *)&dst, sizeof(dst));
if (n == -1) {
if (errno == ENOBUFS)
continue;
atf_tc_fail_errno("sendto failed");
}
RL(rump_sys_fcntl(s, F_SETFL, xnon));
while ((n = rump_sys_recvfrom(s, recvbuf, sizeof(recvbuf), 0,
(struct sockaddr *)&pingee, &slen)) > 0) {
succ++;
}
if (n == -1 && (errno == EAGAIN || errno == ENOBUFS))
continue;
atf_tc_fail_errno("recv failed (n == %zd)", n);
}
rump_sys_close(s);
return succ;
}
#define LOOPS 10000
ATF_TC_BODY(floodping, tc)
{
char ifname[IFNAMSIZ];
pid_t cpid;
int succ;
cpid = fork();
rump_init();
netcfg_rump_makeshmif("thank-you-driver-for-getting-me-here", ifname);
switch (cpid) {
case -1:
atf_tc_fail_errno("fork failed");
case 0:
netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
pause();
break;
default:
break;
}
netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
succ = doping("1.1.1.10", LOOPS, 56);
printf("got %d/%d\n", succ, LOOPS);
kill(cpid, SIGKILL);
}
ATF_TC(floodping2);
ATF_TC_HEAD(floodping2, tc)
{
atf_tc_set_md_var(tc, "descr", "two hosts floodpinging each other");
}
ATF_TC_BODY(floodping2, tc)
{
char ifname[IFNAMSIZ];
pid_t cpid;
int succ;
cpid = fork();
rump_init();
netcfg_rump_makeshmif("floodping2", ifname);
switch (cpid) {
case -1:
atf_tc_fail_errno("fork failed");
case 0:
netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
succ = doping("1.1.1.20", LOOPS, 56);
break;
default:
netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
succ = doping("1.1.1.10", LOOPS, 56);
break;
}
printf("got %d/%d\n", succ, LOOPS);
}
ATF_TC(pingsize);
ATF_TC_HEAD(pingsize, tc)
{
atf_tc_set_md_var(tc, "descr", "ping with packets min <= size <= max");
}
ATF_TC_BODY(pingsize, tc)
{
char ifname[IFNAMSIZ];
pid_t cpid;
int sent, succ, i;
cpid = fork();
rump_init();
netcfg_rump_makeshmif("jippikaiee", ifname);
switch (cpid) {
case -1:
atf_tc_fail_errno("fork failed");
case 0:
netcfg_rump_if(ifname, "1.1.1.10", "255.255.255.0");
pause();
break;
default:
break;
}
netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
succ = sent = 0;
/* small sizes */
for (i = 0 ; i < IP_MAXPACKET - 60000; i++) {
sent++;
succ += doping("1.1.1.10", 1, i);
}
/* medium sizes */
for (i = IP_MAXPACKET - 60000; i < IP_MAXPACKET - 100; i += 1000) {
sent++;
succ += doping("1.1.1.10", 1, i);
}
/* big sizes */
for (i = IP_MAXPACKET - 100; i < IP_MAXPACKET; i += 10) {
sent++;
succ += doping("1.1.1.10", 1, i);
}
printf("got %d/%d\n", succ, sent);
kill(cpid, SIGKILL);
}
ATF_TC(ping_of_death);
ATF_TC_HEAD(ping_of_death, tc)
{
atf_tc_set_md_var(tc, "descr", "send a \"ping of death\"");
atf_tc_set_md_var(tc, "timeout", "20");
}
ATF_TC_BODY(ping_of_death, tc)
{
char data[1500];
struct sockaddr_in dst;
struct ip *ip;
struct icmp *icmp;
char ifname[IFNAMSIZ];
pid_t cpid;
size_t tot, frag;
int s, x, loop;
ssize_t error;
cpid = fork();
rump_init();
netcfg_rump_makeshmif("jippikaiee", ifname);
switch (cpid) {
case -1:
atf_tc_fail_errno("fork failed");
case 0:
/* wait until we receive a too long IP packet */
for (loop = 0;; loop++) {
uint64_t ipstat[IP_NSTATS];
size_t arglen;
int mib[4];
if (loop == 1)
netcfg_rump_if(ifname,
"1.1.1.10", "255.255.255.0");
mib[0] = CTL_NET;
mib[1] = PF_INET;
mib[2] = IPPROTO_IP;
mib[3] = IPCTL_STATS;
arglen = sizeof(ipstat);
RL(rump_sys___sysctl(mib, 4, &ipstat, &arglen,
NULL, 0));
if (loop == 0 && ipstat[IP_STAT_TOOLONG] != 0)
_exit(1);
if (ipstat[IP_STAT_TOOLONG])
break;
usleep(10000);
}
_exit(0);
break;
default:
break;
}
netcfg_rump_if(ifname, "1.1.1.20", "255.255.255.0");
RL(s = rump_sys_socket(PF_INET, SOCK_RAW, 0));
x = 1;
RL(rump_sys_setsockopt(s, IPPROTO_IP, IP_HDRINCL, &x, sizeof(x)));
memset(&dst, 0, sizeof(dst));
dst.sin_len = sizeof(dst);
dst.sin_family = AF_INET;
dst.sin_addr.s_addr = inet_addr("1.1.1.10");
/* construct packet */
memset(data, 0, sizeof(data));
ip = (struct ip *)data;
ip->ip_v = 4;
ip->ip_hl = sizeof(*ip) >> 2;
ip->ip_p = IPPROTO_ICMP;
ip->ip_ttl = IPDEFTTL;
ip->ip_dst = dst.sin_addr;
ip->ip_id = 1234;
icmp = (struct icmp *)(ip + 1);
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_cksum = in_cksum(icmp, sizeof(*icmp));
for (;;) {
int status;
/* resolve arp before sending raw stuff */
netcfg_rump_pingtest("1.1.1.10", 1);
for (tot = 0;
tot < 65538 - sizeof(*ip);
tot += (frag - sizeof(*ip))) {
frag = MIN(65538 - tot, sizeof(data));
ip->ip_off = tot >> 3;
assert((size_t)ip->ip_off << 3 == tot);
ip->ip_len = frag;
if (frag == sizeof(data)) {
ip->ip_off |= IP_MF;
}
error = rump_sys_sendto(s, data, frag, 0,
(struct sockaddr *)&dst, sizeof(dst));
if (error == -1) {
if (errno == ENOBUFS)
continue;
atf_tc_fail_errno("sendto failed");
}
if ((size_t)error != frag)
atf_tc_fail("sendto did not write all data");
}
if (waitpid(-1, &status, WNOHANG) > 0) {
if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
break;
atf_tc_fail("child did not exit clean");
}
usleep(10000);
}
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, simpleping);
ATF_TP_ADD_TC(tp, floodping);
ATF_TP_ADD_TC(tp, floodping2);
ATF_TP_ADD_TC(tp, pingsize);
ATF_TP_ADD_TC(tp, ping_of_death);
return atf_no_error();
}