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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(HAVE_NETINET_IP_H) && \
defined(HAVE_NETINET_IP_ICMP_H) && \
defined(HAVE_ICMPHDR)
#define MAX_PAYLOAD_SIZE (1000)
/*
* stress_icmp_flood_supported()
* check if we can run this as root
*/
static int stress_icmp_flood_supported(void)
{
if (geteuid() != 0) {
pr_inf("icmp flood stressor will be skipped, "
"need to be running as root for this stressor\n");
return -1;
}
return 0;
}
static inline uint32_t checksum(uint16_t *ptr, size_t n)
{
uint32_t sum = 0;
while (n > 1) {
sum += *ptr++;
n -= 2;
}
if (n)
sum += *(uint8_t*)ptr;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return ~sum;
}
/*
* stress_icmp_flood
* stress local host with ICMP flood
*/
static int stress_icmp_flood(const args_t *args)
{
int fd, rc = EXIT_FAILURE;
const int set_on = 1;
const unsigned long addr = inet_addr("127.0.0.1");
struct sockaddr_in servaddr;
uint64_t sendto_fails = 0;
fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (fd < 0) {
pr_fail_err("socket");
goto err;
}
if (setsockopt(fd, IPPROTO_IP, IP_HDRINCL,
(const char *)&set_on, sizeof(set_on)) < 0) {
pr_fail_err("setsockopt IP_HDRINCL");
goto err_socket;
}
if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
(const char *)&set_on, sizeof(set_on)) < 0) {
pr_fail_err("setsockopt SO_BROADCAST");
goto err_socket;
}
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = addr;
(void)memset(&servaddr.sin_zero, 0, sizeof(servaddr.sin_zero));
do {
const size_t payload_len = (mwc32() % MAX_PAYLOAD_SIZE) + 1;
const size_t pkt_len =
sizeof(struct iphdr) + sizeof(struct icmphdr) + payload_len;
char pkt[pkt_len];
struct iphdr *ip_hdr = (struct iphdr *)pkt;
struct icmphdr *icmp_hdr = (struct icmphdr *)(pkt + sizeof(struct iphdr));
(void)memset(pkt, 0, sizeof(pkt));
ip_hdr->version = 4;
ip_hdr->ihl = 5;
ip_hdr->tos = 0;
ip_hdr->tot_len = htons(pkt_len);
ip_hdr->id = mwc32();
ip_hdr->frag_off = 0;
ip_hdr->ttl = 64;
ip_hdr->protocol = IPPROTO_ICMP;
ip_hdr->saddr = addr;
ip_hdr->daddr = addr;
icmp_hdr->type = ICMP_ECHO;
icmp_hdr->code = 0;
icmp_hdr->un.echo.sequence = mwc32();
icmp_hdr->un.echo.id = mwc32();
/*
* Generating random data is expensive so do it every 64 packets
*/
if ((get_counter(args) & 0x3f) == 0)
stress_strnrnd(pkt + sizeof(struct iphdr) +
sizeof(struct icmphdr), payload_len);
icmp_hdr->checksum = checksum((uint16_t *)icmp_hdr,
sizeof(struct icmphdr) + payload_len);
if ((sendto(fd, pkt, pkt_len, 0,
(struct sockaddr*)&servaddr, sizeof(servaddr))) < 1) {
sendto_fails++;
}
inc_counter(args);
} while (keep_stressing());
pr_dbg("%s: %.2f%% of %" PRIu64 " sendto messages succeeded.\n",
args->name,
100.0 * (float)(get_counter(args) - sendto_fails) / get_counter(args),
get_counter(args));
rc = EXIT_SUCCESS;
err_socket:
(void)close(fd);
err:
return rc;
}
stressor_info_t stress_icmp_flood_info = {
.stressor = stress_icmp_flood,
.supported = stress_icmp_flood_supported,
.class = CLASS_OS | CLASS_NETWORK
};
#else
stressor_info_t stress_icmp_flood_info = {
.stressor = stress_not_implemented,
.class = CLASS_OS | CLASS_NETWORK
};
#endif
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