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