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/*
* Copyright (C) 2017-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* 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.
*
*/
#include "stress-ng.h"
#include "core-builtin.h"
#include "core-capabilities.h"
#include <sys/socket.h>
#if defined(HAVE_LINUX_CN_PROC_H)
#include <linux/cn_proc.h>
#endif
#if defined(HAVE_LINUX_CONNECTOR_H)
#include <linux/connector.h>
#endif
#if defined(HAVE_LINUX_NETLINK_H)
#include <linux/netlink.h>
#endif
#if defined(HAVE_SYS_UIO_H)
#include <sys/uio.h>
#endif
#if defined(HAVE_LINUX_VERSION_H)
#include <linux/version.h>
#endif
static const stress_help_t help[] = {
{ NULL, "netlink-proc N", "start N workers exercising netlink process events" },
{ NULL, "netlink-proc-ops N", "stop netlink-proc workers after N bogo events" },
{ NULL, NULL, NULL }
};
#if defined (__linux__) && \
defined(HAVE_LINUX_CONNECTOR_H) && \
defined(HAVE_LINUX_NETLINK_H) && \
defined(HAVE_LINUX_CN_PROC_H)
#ifndef LINUX_VERSION_CODE
#define LINUX_VERSION_CODE KERNEL_VERSION(2,0,0)
#endif
/*
* stress_netlink_proc_supported()
* check if we can run this as root
*/
static int stress_netlink_proc_supported(const char *name)
{
if (!stress_check_capability(SHIM_CAP_NET_ADMIN)) {
pr_inf_skip("%s stressor will be skipped, "
"need to be running with CAP_NET_ADMIN "
"rights for this stressor\n", name);
return -1;
}
return 0;
}
/*
* monitor()
* monitor system activity
*/
static int monitor(stress_args_t *args, const int sock)
{
struct nlmsghdr *nlmsghdr;
ssize_t len;
char __attribute__ ((aligned(NLMSG_ALIGNTO)))buf[4096];
if ((len = recv(sock, buf, sizeof(buf), 0)) == 0)
return 0;
if (len == -1) {
switch (errno) {
case EINTR:
case ENOBUFS:
return 0;
default:
return -1;
}
}
for (nlmsghdr = (struct nlmsghdr *)buf;
NLMSG_OK(nlmsghdr, (unsigned int)len);
nlmsghdr = NLMSG_NEXT(nlmsghdr, len)) {
const struct cn_msg *cn_msg;
const struct proc_event *proc_ev;
if (UNLIKELY(!stress_continue_flag()))
return 0;
if ((nlmsghdr->nlmsg_type == NLMSG_ERROR) ||
(nlmsghdr->nlmsg_type == NLMSG_NOOP))
continue;
cn_msg = NLMSG_DATA(nlmsghdr);
if ((cn_msg->id.idx != CN_IDX_PROC) ||
(cn_msg->id.val != CN_VAL_PROC))
continue;
proc_ev = (const struct proc_event *)cn_msg->data;
switch (proc_ev->what) {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
case PROC_EVENT_NONE:
break;
case PROC_EVENT_FORK:
case PROC_EVENT_EXEC:
case PROC_EVENT_EXIT:
case PROC_EVENT_UID:
case PROC_EVENT_GID:
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
case PROC_EVENT_SID:
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
case PROC_EVENT_COREDUMP:
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
case PROC_EVENT_COMM:
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
case PROC_EVENT_PTRACE:
#endif
stress_bogo_inc(args);
break;
default:
break;
}
}
return 0;
}
/*
* spawn_several()
* create a bunch of processes
*/
static void spawn_several(const char *name, const int n, const int max)
{
pid_t pid;
pid = fork();
if (pid == 0) {
char newname[128];
(void)snprintf(newname, sizeof(newname), "%d", n);
stress_set_proc_name(newname);
if (n >= max) {
stress_set_proc_name("dead");
_exit(0);
} else {
stress_set_proc_name("spawn");
spawn_several(name, n + 1, max);
}
} else if (pid < 0) {
return;
} else {
int status;
if (n != 0)
stress_set_proc_name("wait");
(void)shim_waitpid(pid, &status, 0);
if (n != 0)
_exit(0);
}
}
/*
* stress_netlink_proc()
* stress netlink proc events
*/
static int stress_netlink_proc(stress_args_t *args)
{
int sock = -1;
struct sockaddr_nl addr;
struct iovec iov[3];
struct nlmsghdr nlmsghdr;
struct cn_msg cn_msg;
enum proc_cn_mcast_op op;
if ((sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR)) < 0) {
if (errno == EPROTONOSUPPORT) {
pr_err("%s: kernel does not support netlink, errno=%d (%s)\n",
args->name, errno, strerror(errno));
return EXIT_NO_RESOURCE;
}
pr_fail("%s: socket failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
return EXIT_FAILURE;
}
(void)shim_memset(&addr, 0, sizeof(addr));
addr.nl_pid = (uint32_t)getpid();
addr.nl_family = AF_NETLINK;
addr.nl_groups = CN_IDX_PROC;
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
if (errno == EPERM) {
pr_inf_skip("%s: bind failed, no permission, "
"skipping stressor\n", args->name);
(void)close(sock);
return EXIT_NO_RESOURCE;
}
pr_err("%s: bind failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
(void)close(sock);
return EXIT_FAILURE;
}
(void)shim_memset(&nlmsghdr, 0, sizeof(nlmsghdr));
nlmsghdr.nlmsg_len = NLMSG_LENGTH(sizeof(cn_msg) + sizeof(op));
nlmsghdr.nlmsg_pid = (uint32_t)getpid();
nlmsghdr.nlmsg_type = NLMSG_DONE;
iov[0].iov_base = &nlmsghdr;
iov[0].iov_len = sizeof(nlmsghdr);
(void)shim_memset(&cn_msg, 0, sizeof(cn_msg));
cn_msg.id.idx = CN_IDX_PROC;
cn_msg.id.val = CN_VAL_PROC;
cn_msg.len = sizeof(enum proc_cn_mcast_op);
iov[1].iov_base = &cn_msg;
iov[1].iov_len = sizeof(cn_msg);
op = PROC_CN_MCAST_LISTEN;
iov[2].iov_base = &op;
iov[2].iov_len = sizeof(op);
if (writev(sock, iov, 3) < 0) {
if (errno == ECONNREFUSED) {
pr_inf_skip("%s: net link write failed, errno=%d (%s), skipping stress test\n",
args->name, errno, strerror(errno));
(void)close(sock);
return EXIT_NO_RESOURCE;
}
pr_fail("%s: writev failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
(void)close(sock);
return EXIT_FAILURE;
}
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
do {
spawn_several(args->name, 0, 5);
if (monitor(args, sock) < 0)
break;
} while (stress_continue(args));
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
(void)close(sock);
return EXIT_SUCCESS;
}
const stressor_info_t stress_netlink_proc_info = {
.stressor = stress_netlink_proc,
.supported = stress_netlink_proc_supported,
.classifier = CLASS_SCHEDULER | CLASS_OS,
.help = help
};
#else
const stressor_info_t stress_netlink_proc_info = {
.stressor = stress_unimplemented,
.classifier = CLASS_SCHEDULER | CLASS_OS,
.help = help,
.unimplemented_reason = "built without linux/connector.h, linux/netlink.h or linux/cn_proc.h support"
};
#endif
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