Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * connector.c |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 3 | * |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 4 | * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru> |
| 5 | * All rights reserved. |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 6 | * |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/list.h> |
| 25 | #include <linux/skbuff.h> |
| 26 | #include <linux/netlink.h> |
| 27 | #include <linux/moduleparam.h> |
| 28 | #include <linux/connector.h> |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 29 | #include <linux/mutex.h> |
Li Zefan | a0a61a6 | 2008-06-27 20:03:24 -0700 | [diff] [blame] | 30 | #include <linux/proc_fs.h> |
| 31 | #include <linux/spinlock.h> |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 32 | |
| 33 | #include <net/sock.h> |
| 34 | |
| 35 | MODULE_LICENSE("GPL"); |
| 36 | MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>"); |
| 37 | MODULE_DESCRIPTION("Generic userspace <-> kernelspace connector."); |
| 38 | |
| 39 | static u32 cn_idx = CN_IDX_CONNECTOR; |
| 40 | static u32 cn_val = CN_VAL_CONNECTOR; |
| 41 | |
| 42 | module_param(cn_idx, uint, 0); |
| 43 | module_param(cn_val, uint, 0); |
| 44 | MODULE_PARM_DESC(cn_idx, "Connector's main device idx."); |
| 45 | MODULE_PARM_DESC(cn_val, "Connector's main device val."); |
| 46 | |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 47 | static DEFINE_MUTEX(notify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 48 | static LIST_HEAD(notify_list); |
| 49 | |
| 50 | static struct cn_dev cdev; |
| 51 | |
Li Zefan | 7837467 | 2008-02-26 18:25:53 -0800 | [diff] [blame] | 52 | static int cn_already_initialized; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
| 55 | * msg->seq and msg->ack are used to determine message genealogy. |
| 56 | * When someone sends message it puts there locally unique sequence |
| 57 | * and random acknowledge numbers. Sequence number may be copied into |
| 58 | * nlmsghdr->nlmsg_seq too. |
| 59 | * |
| 60 | * Sequence number is incremented with each message to be sent. |
| 61 | * |
| 62 | * If we expect reply to our message then the sequence number in |
| 63 | * received message MUST be the same as in original message, and |
| 64 | * acknowledge number MUST be the same + 1. |
| 65 | * |
| 66 | * If we receive a message and its sequence number is not equal to the |
| 67 | * one we are expecting then it is a new message. |
| 68 | * |
| 69 | * If we receive a message and its sequence number is the same as one |
| 70 | * we are expecting but it's acknowledgement number is not equal to |
| 71 | * the acknowledgement number in the original message + 1, then it is |
| 72 | * a new message. |
| 73 | * |
| 74 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 75 | int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 76 | { |
| 77 | struct cn_callback_entry *__cbq; |
| 78 | unsigned int size; |
| 79 | struct sk_buff *skb; |
| 80 | struct nlmsghdr *nlh; |
| 81 | struct cn_msg *data; |
| 82 | struct cn_dev *dev = &cdev; |
| 83 | u32 group = 0; |
| 84 | int found = 0; |
| 85 | |
| 86 | if (!__group) { |
| 87 | spin_lock_bh(&dev->cbdev->queue_lock); |
| 88 | list_for_each_entry(__cbq, &dev->cbdev->queue_list, |
| 89 | callback_entry) { |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 90 | if (cn_cb_equal(&__cbq->id.id, &msg->id)) { |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 91 | found = 1; |
| 92 | group = __cbq->group; |
Li Zefan | fd00eec | 2008-01-04 01:54:38 -0800 | [diff] [blame] | 93 | break; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 94 | } |
| 95 | } |
| 96 | spin_unlock_bh(&dev->cbdev->queue_lock); |
| 97 | |
| 98 | if (!found) |
| 99 | return -ENODEV; |
| 100 | } else { |
| 101 | group = __group; |
| 102 | } |
| 103 | |
Evgeniy Polyakov | b191ba0 | 2006-03-20 22:21:40 -0800 | [diff] [blame] | 104 | if (!netlink_has_listeners(dev->nls, group)) |
| 105 | return -ESRCH; |
| 106 | |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 107 | size = NLMSG_SPACE(sizeof(*msg) + msg->len); |
| 108 | |
| 109 | skb = alloc_skb(size, gfp_mask); |
| 110 | if (!skb) |
| 111 | return -ENOMEM; |
| 112 | |
| 113 | nlh = NLMSG_PUT(skb, 0, msg->seq, NLMSG_DONE, size - sizeof(*nlh)); |
| 114 | |
| 115 | data = NLMSG_DATA(nlh); |
| 116 | |
| 117 | memcpy(data, msg, sizeof(*data) + msg->len); |
| 118 | |
| 119 | NETLINK_CB(skb).dst_group = group; |
| 120 | |
Evgeniy Polyakov | b191ba0 | 2006-03-20 22:21:40 -0800 | [diff] [blame] | 121 | return netlink_broadcast(dev->nls, skb, 0, group, gfp_mask); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 122 | |
| 123 | nlmsg_failure: |
| 124 | kfree_skb(skb); |
| 125 | return -EINVAL; |
| 126 | } |
Andrew Morton | deb0e9b | 2006-06-23 02:05:46 -0700 | [diff] [blame] | 127 | EXPORT_SYMBOL_GPL(cn_netlink_send); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * Callback helper - queues work and setup destructor for given data. |
| 131 | */ |
| 132 | static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), void *data) |
| 133 | { |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 134 | struct cn_callback_entry *__cbq, *__new_cbq; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 135 | struct cn_dev *dev = &cdev; |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 136 | int err = -ENODEV; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 137 | |
| 138 | spin_lock_bh(&dev->cbdev->queue_lock); |
| 139 | list_for_each_entry(__cbq, &dev->cbdev->queue_list, callback_entry) { |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 140 | if (cn_cb_equal(&__cbq->id.id, &msg->id)) { |
Evgeniy Polyakov | a240d9f | 2006-12-18 01:53:58 -0800 | [diff] [blame] | 141 | if (likely(!work_pending(&__cbq->work) && |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 142 | __cbq->data.ddata == NULL)) { |
| 143 | __cbq->data.callback_priv = msg; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 144 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 145 | __cbq->data.ddata = data; |
| 146 | __cbq->data.destruct_data = destruct_data; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 147 | |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 148 | if (queue_cn_work(__cbq, &__cbq->work)) |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 149 | err = 0; |
Li Zefan | 134d99e | 2008-01-04 01:52:02 -0800 | [diff] [blame] | 150 | else |
| 151 | err = -EINVAL; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 152 | } else { |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 153 | struct cn_callback_data *d; |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 154 | |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 155 | err = -ENOMEM; |
| 156 | __new_cbq = kzalloc(sizeof(struct cn_callback_entry), GFP_ATOMIC); |
| 157 | if (__new_cbq) { |
| 158 | d = &__new_cbq->data; |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 159 | d->callback_priv = msg; |
| 160 | d->callback = __cbq->data.callback; |
| 161 | d->ddata = data; |
| 162 | d->destruct_data = destruct_data; |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 163 | d->free = __new_cbq; |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 164 | |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 165 | __new_cbq->pdev = __cbq->pdev; |
| 166 | |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 167 | INIT_WORK(&__new_cbq->work, |
Evgeniy Polyakov | a240d9f | 2006-12-18 01:53:58 -0800 | [diff] [blame] | 168 | &cn_queue_wrapper); |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 169 | |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 170 | if (queue_cn_work(__new_cbq, |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 171 | &__new_cbq->work)) |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 172 | err = 0; |
| 173 | else { |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 174 | kfree(__new_cbq); |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 175 | err = -EINVAL; |
| 176 | } |
Philipp Reisner | 05e52dd | 2007-03-07 12:55:39 -0800 | [diff] [blame] | 177 | } |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 178 | } |
| 179 | break; |
| 180 | } |
| 181 | } |
| 182 | spin_unlock_bh(&dev->cbdev->queue_lock); |
| 183 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 184 | return err; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | /* |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 188 | * Main netlink receiving function. |
| 189 | * |
Li Zefan | 00f5e06 | 2008-01-04 01:55:01 -0800 | [diff] [blame] | 190 | * It checks skb, netlink header and msg sizes, and calls callback helper. |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 191 | */ |
| 192 | static void cn_rx_skb(struct sk_buff *__skb) |
| 193 | { |
Li Zefan | 00f5e06 | 2008-01-04 01:55:01 -0800 | [diff] [blame] | 194 | struct cn_msg *msg; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 195 | struct nlmsghdr *nlh; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 196 | int err; |
| 197 | struct sk_buff *skb; |
| 198 | |
| 199 | skb = skb_get(__skb); |
| 200 | |
| 201 | if (skb->len >= NLMSG_SPACE(0)) { |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 202 | nlh = nlmsg_hdr(skb); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 203 | |
| 204 | if (nlh->nlmsg_len < sizeof(struct cn_msg) || |
| 205 | skb->len < nlh->nlmsg_len || |
| 206 | nlh->nlmsg_len > CONNECTOR_MAX_MSG_SIZE) { |
| 207 | kfree_skb(skb); |
Michal Januszewski | 6cf92e9 | 2007-10-30 20:41:49 -0700 | [diff] [blame] | 208 | return; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Li Zefan | 00f5e06 | 2008-01-04 01:55:01 -0800 | [diff] [blame] | 211 | msg = NLMSG_DATA(nlh); |
| 212 | err = cn_call_callback(msg, (void (*)(void *))kfree_skb, skb); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 213 | if (err < 0) |
| 214 | kfree_skb(skb); |
| 215 | } |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | /* |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 219 | * Notification routing. |
| 220 | * |
| 221 | * Gets id and checks if there are notification request for it's idx |
| 222 | * and val. If there are such requests notify the listeners with the |
| 223 | * given notify event. |
| 224 | * |
| 225 | */ |
| 226 | static void cn_notify(struct cb_id *id, u32 notify_event) |
| 227 | { |
| 228 | struct cn_ctl_entry *ent; |
| 229 | |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 230 | mutex_lock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 231 | list_for_each_entry(ent, ¬ify_list, notify_entry) { |
| 232 | int i; |
| 233 | struct cn_notify_req *req; |
| 234 | struct cn_ctl_msg *ctl = ent->msg; |
| 235 | int idx_found, val_found; |
| 236 | |
| 237 | idx_found = val_found = 0; |
| 238 | |
| 239 | req = (struct cn_notify_req *)ctl->data; |
| 240 | for (i = 0; i < ctl->idx_notify_num; ++i, ++req) { |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 241 | if (id->idx >= req->first && |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 242 | id->idx < req->first + req->range) { |
| 243 | idx_found = 1; |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | for (i = 0; i < ctl->val_notify_num; ++i, ++req) { |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 249 | if (id->val >= req->first && |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 250 | id->val < req->first + req->range) { |
| 251 | val_found = 1; |
| 252 | break; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | if (idx_found && val_found) { |
| 257 | struct cn_msg m = { .ack = notify_event, }; |
| 258 | |
| 259 | memcpy(&m.id, id, sizeof(m.id)); |
| 260 | cn_netlink_send(&m, ctl->group, GFP_KERNEL); |
| 261 | } |
| 262 | } |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 263 | mutex_unlock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Callback add routing - adds callback with given ID and name. |
| 268 | * If there is registered callback with the same ID it will not be added. |
| 269 | * |
| 270 | * May sleep. |
| 271 | */ |
Mike Frysinger | 0741241 | 2009-07-17 10:13:21 -0700 | [diff] [blame] | 272 | int cn_add_callback(struct cb_id *id, char *name, |
| 273 | void (*callback)(struct cn_msg *)) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 274 | { |
| 275 | int err; |
| 276 | struct cn_dev *dev = &cdev; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 277 | |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 278 | if (!cn_already_initialized) |
| 279 | return -EAGAIN; |
| 280 | |
Evgeniy Polyakov | acd042b | 2005-09-26 15:06:50 -0700 | [diff] [blame] | 281 | err = cn_queue_add_callback(dev->cbdev, name, id, callback); |
| 282 | if (err) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 283 | return err; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 284 | |
| 285 | cn_notify(id, 0); |
| 286 | |
| 287 | return 0; |
| 288 | } |
Andrew Morton | deb0e9b | 2006-06-23 02:05:46 -0700 | [diff] [blame] | 289 | EXPORT_SYMBOL_GPL(cn_add_callback); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 290 | |
| 291 | /* |
| 292 | * Callback remove routing - removes callback |
| 293 | * with given ID. |
| 294 | * If there is no registered callback with given |
| 295 | * ID nothing happens. |
| 296 | * |
| 297 | * May sleep while waiting for reference counter to become zero. |
| 298 | */ |
| 299 | void cn_del_callback(struct cb_id *id) |
| 300 | { |
| 301 | struct cn_dev *dev = &cdev; |
| 302 | |
| 303 | cn_queue_del_callback(dev->cbdev, id); |
| 304 | cn_notify(id, 1); |
| 305 | } |
Andrew Morton | deb0e9b | 2006-06-23 02:05:46 -0700 | [diff] [blame] | 306 | EXPORT_SYMBOL_GPL(cn_del_callback); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 307 | |
| 308 | /* |
| 309 | * Checks two connector's control messages to be the same. |
| 310 | * Returns 1 if they are the same or if the first one is corrupted. |
| 311 | */ |
| 312 | static int cn_ctl_msg_equals(struct cn_ctl_msg *m1, struct cn_ctl_msg *m2) |
| 313 | { |
| 314 | int i; |
| 315 | struct cn_notify_req *req1, *req2; |
| 316 | |
| 317 | if (m1->idx_notify_num != m2->idx_notify_num) |
| 318 | return 0; |
| 319 | |
| 320 | if (m1->val_notify_num != m2->val_notify_num) |
| 321 | return 0; |
| 322 | |
| 323 | if (m1->len != m2->len) |
| 324 | return 0; |
| 325 | |
| 326 | if ((m1->idx_notify_num + m1->val_notify_num) * sizeof(*req1) != |
| 327 | m1->len) |
| 328 | return 1; |
| 329 | |
| 330 | req1 = (struct cn_notify_req *)m1->data; |
| 331 | req2 = (struct cn_notify_req *)m2->data; |
| 332 | |
| 333 | for (i = 0; i < m1->idx_notify_num; ++i) { |
| 334 | if (req1->first != req2->first || req1->range != req2->range) |
| 335 | return 0; |
| 336 | req1++; |
| 337 | req2++; |
| 338 | } |
| 339 | |
| 340 | for (i = 0; i < m1->val_notify_num; ++i) { |
| 341 | if (req1->first != req2->first || req1->range != req2->range) |
| 342 | return 0; |
| 343 | req1++; |
| 344 | req2++; |
| 345 | } |
| 346 | |
| 347 | return 1; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Main connector device's callback. |
| 352 | * |
| 353 | * Used for notification of a request's processing. |
| 354 | */ |
Mike Frysinger | 0741241 | 2009-07-17 10:13:21 -0700 | [diff] [blame] | 355 | static void cn_callback(struct cn_msg *msg) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 356 | { |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 357 | struct cn_ctl_msg *ctl; |
| 358 | struct cn_ctl_entry *ent; |
| 359 | u32 size; |
| 360 | |
| 361 | if (msg->len < sizeof(*ctl)) |
| 362 | return; |
| 363 | |
| 364 | ctl = (struct cn_ctl_msg *)msg->data; |
| 365 | |
| 366 | size = (sizeof(*ctl) + ((ctl->idx_notify_num + |
| 367 | ctl->val_notify_num) * |
| 368 | sizeof(struct cn_notify_req))); |
| 369 | |
| 370 | if (msg->len != size) |
| 371 | return; |
| 372 | |
| 373 | if (ctl->len + sizeof(*ctl) != msg->len) |
| 374 | return; |
| 375 | |
| 376 | /* |
| 377 | * Remove notification. |
| 378 | */ |
| 379 | if (ctl->group == 0) { |
| 380 | struct cn_ctl_entry *n; |
| 381 | |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 382 | mutex_lock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 383 | list_for_each_entry_safe(ent, n, ¬ify_list, notify_entry) { |
| 384 | if (cn_ctl_msg_equals(ent->msg, ctl)) { |
| 385 | list_del(&ent->notify_entry); |
| 386 | kfree(ent); |
| 387 | } |
| 388 | } |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 389 | mutex_unlock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 390 | |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | size += sizeof(*ent); |
| 395 | |
| 396 | ent = kzalloc(size, GFP_KERNEL); |
| 397 | if (!ent) |
| 398 | return; |
| 399 | |
| 400 | ent->msg = (struct cn_ctl_msg *)(ent + 1); |
| 401 | |
| 402 | memcpy(ent->msg, ctl, size - sizeof(*ent)); |
| 403 | |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 404 | mutex_lock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 405 | list_add(&ent->notify_entry, ¬ify_list); |
Arjan van de Ven | 8ed965d | 2006-03-23 03:00:21 -0800 | [diff] [blame] | 406 | mutex_unlock(¬ify_lock); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Li Zefan | a0a61a6 | 2008-06-27 20:03:24 -0700 | [diff] [blame] | 409 | static int cn_proc_show(struct seq_file *m, void *v) |
| 410 | { |
| 411 | struct cn_queue_dev *dev = cdev.cbdev; |
| 412 | struct cn_callback_entry *cbq; |
| 413 | |
| 414 | seq_printf(m, "Name ID\n"); |
| 415 | |
| 416 | spin_lock_bh(&dev->queue_lock); |
| 417 | |
| 418 | list_for_each_entry(cbq, &dev->queue_list, callback_entry) { |
| 419 | seq_printf(m, "%-15s %u:%u\n", |
| 420 | cbq->id.name, |
| 421 | cbq->id.id.idx, |
| 422 | cbq->id.id.val); |
| 423 | } |
| 424 | |
| 425 | spin_unlock_bh(&dev->queue_lock); |
| 426 | |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int cn_proc_open(struct inode *inode, struct file *file) |
| 431 | { |
| 432 | return single_open(file, cn_proc_show, NULL); |
| 433 | } |
| 434 | |
| 435 | static const struct file_operations cn_file_ops = { |
| 436 | .owner = THIS_MODULE, |
| 437 | .open = cn_proc_open, |
| 438 | .read = seq_read, |
| 439 | .llseek = seq_lseek, |
| 440 | .release = single_release |
| 441 | }; |
| 442 | |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 443 | static int __devinit cn_init(void) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 444 | { |
| 445 | struct cn_dev *dev = &cdev; |
| 446 | int err; |
| 447 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 448 | dev->input = cn_rx_skb; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 449 | dev->id.idx = cn_idx; |
| 450 | dev->id.val = cn_val; |
| 451 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 452 | dev->nls = netlink_kernel_create(&init_net, NETLINK_CONNECTOR, |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 453 | CN_NETLINK_USERS + 0xf, |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 454 | dev->input, NULL, THIS_MODULE); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 455 | if (!dev->nls) |
| 456 | return -EIO; |
| 457 | |
| 458 | dev->cbdev = cn_queue_alloc_dev("cqueue", dev->nls); |
| 459 | if (!dev->cbdev) { |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 460 | netlink_kernel_release(dev->nls); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 461 | return -EINVAL; |
| 462 | } |
Frederic Weisbecker | 1a5645b | 2009-02-02 23:22:04 -0800 | [diff] [blame] | 463 | |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 464 | cn_already_initialized = 1; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 465 | |
| 466 | err = cn_add_callback(&dev->id, "connector", &cn_callback); |
| 467 | if (err) { |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 468 | cn_already_initialized = 0; |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 469 | cn_queue_free_dev(dev->cbdev); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 470 | netlink_kernel_release(dev->nls); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 471 | return -EINVAL; |
| 472 | } |
| 473 | |
Li Zefan | a0a61a6 | 2008-06-27 20:03:24 -0700 | [diff] [blame] | 474 | proc_net_fops_create(&init_net, "connector", S_IRUGO, &cn_file_ops); |
| 475 | |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 476 | return 0; |
| 477 | } |
| 478 | |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 479 | static void __devexit cn_fini(void) |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 480 | { |
| 481 | struct cn_dev *dev = &cdev; |
| 482 | |
| 483 | cn_already_initialized = 0; |
| 484 | |
Li Zefan | a0a61a6 | 2008-06-27 20:03:24 -0700 | [diff] [blame] | 485 | proc_net_remove(&init_net, "connector"); |
| 486 | |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 487 | cn_del_callback(&dev->id); |
| 488 | cn_queue_free_dev(dev->cbdev); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 489 | netlink_kernel_release(dev->nls); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 490 | } |
| 491 | |
Evgeniy Polyakov | d6cc7f1 | 2006-06-19 23:42:53 -0700 | [diff] [blame] | 492 | subsys_initcall(cn_init); |
Evgeniy Polyakov | 7672d0b | 2005-09-11 19:15:07 -0700 | [diff] [blame] | 493 | module_exit(cn_fini); |