cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cn_test.c (3943B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * 	cn_test.c
      4 * 
      5 * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
      6 * All rights reserved.
      7 */
      8
      9#define pr_fmt(fmt) "cn_test: " fmt
     10
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/moduleparam.h>
     14#include <linux/skbuff.h>
     15#include <linux/slab.h>
     16#include <linux/timer.h>
     17
     18#include <linux/connector.h>
     19
     20static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
     21static char cn_test_name[] = "cn_test";
     22static struct sock *nls;
     23static struct timer_list cn_test_timer;
     24
     25static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
     26{
     27	pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
     28	        __func__, jiffies, msg->id.idx, msg->id.val,
     29	        msg->seq, msg->ack, msg->len,
     30	        msg->len ? (char *)msg->data : "");
     31}
     32
     33/*
     34 * Do not remove this function even if no one is using it as
     35 * this is an example of how to get notifications about new
     36 * connector user registration
     37 */
     38#if 0
     39static int cn_test_want_notify(void)
     40{
     41	struct cn_ctl_msg *ctl;
     42	struct cn_notify_req *req;
     43	struct cn_msg *msg = NULL;
     44	int size, size0;
     45	struct sk_buff *skb;
     46	struct nlmsghdr *nlh;
     47	u32 group = 1;
     48
     49	size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
     50
     51	size = NLMSG_SPACE(size0);
     52
     53	skb = alloc_skb(size, GFP_ATOMIC);
     54	if (!skb) {
     55		pr_err("failed to allocate new skb with size=%u\n", size);
     56		return -ENOMEM;
     57	}
     58
     59	nlh = nlmsg_put(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh), 0);
     60	if (!nlh) {
     61		kfree_skb(skb);
     62		return -EMSGSIZE;
     63	}
     64
     65	msg = nlmsg_data(nlh);
     66
     67	memset(msg, 0, size0);
     68
     69	msg->id.idx = -1;
     70	msg->id.val = -1;
     71	msg->seq = 0x123;
     72	msg->ack = 0x345;
     73	msg->len = size0 - sizeof(*msg);
     74
     75	ctl = (struct cn_ctl_msg *)(msg + 1);
     76
     77	ctl->idx_notify_num = 1;
     78	ctl->val_notify_num = 2;
     79	ctl->group = group;
     80	ctl->len = msg->len - sizeof(*ctl);
     81
     82	req = (struct cn_notify_req *)(ctl + 1);
     83
     84	/*
     85	 * Idx.
     86	 */
     87	req->first = cn_test_id.idx;
     88	req->range = 10;
     89
     90	/*
     91	 * Val 0.
     92	 */
     93	req++;
     94	req->first = cn_test_id.val;
     95	req->range = 10;
     96
     97	/*
     98	 * Val 1.
     99	 */
    100	req++;
    101	req->first = cn_test_id.val + 20;
    102	req->range = 10;
    103
    104	NETLINK_CB(skb).dst_group = ctl->group;
    105	//netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
    106	netlink_unicast(nls, skb, 0, 0);
    107
    108	pr_info("request was sent: group=0x%x\n", ctl->group);
    109
    110	return 0;
    111}
    112#endif
    113
    114static u32 cn_test_timer_counter;
    115static void cn_test_timer_func(struct timer_list *unused)
    116{
    117	struct cn_msg *m;
    118	char data[32];
    119
    120	pr_debug("%s: timer fired\n", __func__);
    121
    122	m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
    123	if (m) {
    124
    125		memcpy(&m->id, &cn_test_id, sizeof(m->id));
    126		m->seq = cn_test_timer_counter;
    127		m->len = sizeof(data);
    128
    129		m->len =
    130		    scnprintf(data, sizeof(data), "counter = %u",
    131			      cn_test_timer_counter) + 1;
    132
    133		memcpy(m + 1, data, m->len);
    134
    135		cn_netlink_send(m, 0, 0, GFP_ATOMIC);
    136		kfree(m);
    137	}
    138
    139	cn_test_timer_counter++;
    140
    141	mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
    142}
    143
    144static int cn_test_init(void)
    145{
    146	int err;
    147
    148	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
    149	if (err)
    150		goto err_out;
    151	cn_test_id.val++;
    152	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
    153	if (err) {
    154		cn_del_callback(&cn_test_id);
    155		goto err_out;
    156	}
    157
    158	timer_setup(&cn_test_timer, cn_test_timer_func, 0);
    159	mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
    160
    161	pr_info("initialized with id={%u.%u}\n",
    162		cn_test_id.idx, cn_test_id.val);
    163
    164	return 0;
    165
    166      err_out:
    167	if (nls && nls->sk_socket)
    168		sock_release(nls->sk_socket);
    169
    170	return err;
    171}
    172
    173static void cn_test_fini(void)
    174{
    175	del_timer_sync(&cn_test_timer);
    176	cn_del_callback(&cn_test_id);
    177	cn_test_id.val--;
    178	cn_del_callback(&cn_test_id);
    179	if (nls && nls->sk_socket)
    180		sock_release(nls->sk_socket);
    181}
    182
    183module_init(cn_test_init);
    184module_exit(cn_test_fini);
    185
    186MODULE_LICENSE("GPL");
    187MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
    188MODULE_DESCRIPTION("Connector's test module");