1 /* 2 * w1_netlink.c 3 * 4 * Copyright (c) 2003 Evgeniy Polyakov <zbr@ioremap.net> 5 * 6 * 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/slab.h> 23 #include <linux/skbuff.h> 24 #include <linux/netlink.h> 25 #include <linux/connector.h> 26 27 #include "w1.h" 28 #include "w1_log.h" 29 #include "w1_netlink.h" 30 31 #if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE))) 32 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 33 { 34 char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)]; 35 struct cn_msg *m = (struct cn_msg *)buf; 36 struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1); 37 38 memset(buf, 0, sizeof(buf)); 39 40 m->id.idx = CN_W1_IDX; 41 m->id.val = CN_W1_VAL; 42 43 m->seq = dev->seq++; 44 m->len = sizeof(struct w1_netlink_msg); 45 46 memcpy(w, msg, sizeof(struct w1_netlink_msg)); 47 48 cn_netlink_send(m, 0, GFP_KERNEL); 49 } 50 51 static void w1_send_slave(struct w1_master *dev, u64 rn) 52 { 53 struct cn_msg *msg = dev->priv; 54 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1); 55 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1); 56 int avail; 57 u64 *data; 58 59 /* update kernel slave list */ 60 w1_slave_found(dev, rn); 61 62 avail = dev->priv_size - cmd->len; 63 64 if (avail < 8) { 65 msg->ack++; 66 cn_netlink_send(msg, 0, GFP_KERNEL); 67 68 msg->len = sizeof(struct w1_netlink_msg) + 69 sizeof(struct w1_netlink_cmd); 70 hdr->len = sizeof(struct w1_netlink_cmd); 71 cmd->len = 0; 72 } 73 74 data = (void *)(cmd + 1) + cmd->len; 75 76 *data = rn; 77 cmd->len += 8; 78 hdr->len += 8; 79 msg->len += 8; 80 } 81 82 static int w1_process_search_command(struct w1_master *dev, struct cn_msg *msg, 83 unsigned int avail) 84 { 85 struct w1_netlink_msg *hdr = (struct w1_netlink_msg *)(msg + 1); 86 struct w1_netlink_cmd *cmd = (struct w1_netlink_cmd *)(hdr + 1); 87 int search_type = (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH; 88 89 dev->priv = msg; 90 dev->priv_size = avail; 91 92 w1_search_process_cb(dev, search_type, w1_send_slave); 93 94 msg->ack = 0; 95 cn_netlink_send(msg, 0, GFP_KERNEL); 96 97 dev->priv = NULL; 98 dev->priv_size = 0; 99 100 return 0; 101 } 102 103 static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr, 104 struct w1_netlink_cmd *cmd) 105 { 106 void *data; 107 struct w1_netlink_msg *h; 108 struct w1_netlink_cmd *c; 109 struct cn_msg *cm; 110 int err; 111 112 data = kzalloc(sizeof(struct cn_msg) + 113 sizeof(struct w1_netlink_msg) + 114 sizeof(struct w1_netlink_cmd) + 115 cmd->len, GFP_KERNEL); 116 if (!data) 117 return -ENOMEM; 118 119 cm = (struct cn_msg *)(data); 120 h = (struct w1_netlink_msg *)(cm + 1); 121 c = (struct w1_netlink_cmd *)(h + 1); 122 123 memcpy(cm, msg, sizeof(struct cn_msg)); 124 memcpy(h, hdr, sizeof(struct w1_netlink_msg)); 125 memcpy(c, cmd, sizeof(struct w1_netlink_cmd)); 126 127 cm->ack = msg->seq+1; 128 cm->len = sizeof(struct w1_netlink_msg) + 129 sizeof(struct w1_netlink_cmd) + cmd->len; 130 131 h->len = sizeof(struct w1_netlink_cmd) + cmd->len; 132 133 memcpy(c->data, cmd->data, c->len); 134 135 err = cn_netlink_send(cm, 0, GFP_KERNEL); 136 137 kfree(data); 138 139 return err; 140 } 141 142 static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg, 143 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) 144 { 145 int err = 0; 146 147 switch (cmd->cmd) { 148 case W1_CMD_TOUCH: 149 w1_touch_block(dev, cmd->data, cmd->len); 150 w1_send_read_reply(msg, hdr, cmd); 151 break; 152 case W1_CMD_READ: 153 w1_read_block(dev, cmd->data, cmd->len); 154 w1_send_read_reply(msg, hdr, cmd); 155 break; 156 case W1_CMD_WRITE: 157 w1_write_block(dev, cmd->data, cmd->len); 158 break; 159 default: 160 err = -EINVAL; 161 break; 162 } 163 164 return err; 165 } 166 167 static int w1_process_command_master(struct w1_master *dev, struct cn_msg *req_msg, 168 struct w1_netlink_msg *req_hdr, struct w1_netlink_cmd *req_cmd) 169 { 170 int err = -EINVAL; 171 struct cn_msg *msg; 172 struct w1_netlink_msg *hdr; 173 struct w1_netlink_cmd *cmd; 174 175 msg = kzalloc(PAGE_SIZE, GFP_KERNEL); 176 if (!msg) 177 return -ENOMEM; 178 179 msg->id = req_msg->id; 180 msg->seq = req_msg->seq; 181 msg->ack = 0; 182 msg->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd); 183 184 hdr = (struct w1_netlink_msg *)(msg + 1); 185 cmd = (struct w1_netlink_cmd *)(hdr + 1); 186 187 hdr->type = W1_MASTER_CMD; 188 hdr->id = req_hdr->id; 189 hdr->len = sizeof(struct w1_netlink_cmd); 190 191 cmd->cmd = req_cmd->cmd; 192 cmd->len = 0; 193 194 switch (cmd->cmd) { 195 case W1_CMD_SEARCH: 196 case W1_CMD_ALARM_SEARCH: 197 err = w1_process_search_command(dev, msg, 198 PAGE_SIZE - msg->len - sizeof(struct cn_msg)); 199 break; 200 case W1_CMD_READ: 201 case W1_CMD_WRITE: 202 case W1_CMD_TOUCH: 203 err = w1_process_command_io(dev, req_msg, req_hdr, req_cmd); 204 break; 205 case W1_CMD_RESET: 206 err = w1_reset_bus(dev); 207 break; 208 default: 209 err = -EINVAL; 210 break; 211 } 212 213 kfree(msg); 214 return err; 215 } 216 217 static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg, 218 struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd) 219 { 220 dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n", 221 __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, 222 sl->reg_num.crc, cmd->cmd, cmd->len); 223 224 return w1_process_command_io(sl->master, msg, hdr, cmd); 225 } 226 227 static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd) 228 { 229 struct w1_master *m; 230 struct cn_msg *cn; 231 struct w1_netlink_msg *w; 232 u32 *id; 233 234 if (mcmd->type != W1_LIST_MASTERS) { 235 printk(KERN_NOTICE "%s: msg: %x.%x, wrong type: %u, len: %u.\n", 236 __func__, msg->id.idx, msg->id.val, mcmd->type, mcmd->len); 237 return -EPROTO; 238 } 239 240 cn = kmalloc(PAGE_SIZE, GFP_KERNEL); 241 if (!cn) 242 return -ENOMEM; 243 244 cn->id.idx = CN_W1_IDX; 245 cn->id.val = CN_W1_VAL; 246 247 cn->seq = msg->seq; 248 cn->ack = 1; 249 cn->len = sizeof(struct w1_netlink_msg); 250 w = (struct w1_netlink_msg *)(cn + 1); 251 252 w->type = W1_LIST_MASTERS; 253 w->status = 0; 254 w->len = 0; 255 id = (u32 *)(w + 1); 256 257 mutex_lock(&w1_mlock); 258 list_for_each_entry(m, &w1_masters, w1_master_entry) { 259 if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) { 260 cn_netlink_send(cn, 0, GFP_KERNEL); 261 cn->ack++; 262 cn->len = sizeof(struct w1_netlink_msg); 263 w->len = 0; 264 id = (u32 *)(w + 1); 265 } 266 267 *id = m->id; 268 w->len += sizeof(*id); 269 cn->len += sizeof(*id); 270 id++; 271 } 272 cn->ack = 0; 273 cn_netlink_send(cn, 0, GFP_KERNEL); 274 mutex_unlock(&w1_mlock); 275 276 kfree(cn); 277 return 0; 278 } 279 280 static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg, 281 struct w1_netlink_cmd *rcmd, int error) 282 { 283 struct cn_msg *cmsg; 284 struct w1_netlink_msg *msg; 285 struct w1_netlink_cmd *cmd; 286 287 cmsg = kzalloc(sizeof(*msg) + sizeof(*cmd) + sizeof(*cmsg), GFP_KERNEL); 288 if (!cmsg) 289 return -ENOMEM; 290 291 msg = (struct w1_netlink_msg *)(cmsg + 1); 292 cmd = (struct w1_netlink_cmd *)(msg + 1); 293 294 memcpy(cmsg, rcmsg, sizeof(*cmsg)); 295 cmsg->len = sizeof(*msg); 296 297 memcpy(msg, rmsg, sizeof(*msg)); 298 msg->len = 0; 299 msg->status = (short)-error; 300 301 if (rcmd) { 302 memcpy(cmd, rcmd, sizeof(*cmd)); 303 cmd->len = 0; 304 msg->len += sizeof(*cmd); 305 cmsg->len += sizeof(*cmd); 306 } 307 308 error = cn_netlink_send(cmsg, 0, GFP_KERNEL); 309 kfree(cmsg); 310 311 return error; 312 } 313 314 static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) 315 { 316 struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1); 317 struct w1_netlink_cmd *cmd; 318 struct w1_slave *sl; 319 struct w1_master *dev; 320 int err = 0; 321 322 while (msg->len && !err) { 323 struct w1_reg_num id; 324 u16 mlen = m->len; 325 u8 *cmd_data = m->data; 326 327 dev = NULL; 328 sl = NULL; 329 cmd = NULL; 330 331 memcpy(&id, m->id.id, sizeof(id)); 332 #if 0 333 printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n", 334 __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len); 335 #endif 336 if (m->len + sizeof(struct w1_netlink_msg) > msg->len) { 337 err = -E2BIG; 338 break; 339 } 340 341 if (m->type == W1_MASTER_CMD) { 342 dev = w1_search_master_id(m->id.mst.id); 343 } else if (m->type == W1_SLAVE_CMD) { 344 sl = w1_search_slave(&id); 345 if (sl) 346 dev = sl->master; 347 } else { 348 err = w1_process_command_root(msg, m); 349 goto out_cont; 350 } 351 352 if (!dev) { 353 err = -ENODEV; 354 goto out_cont; 355 } 356 357 err = 0; 358 if (!mlen) 359 goto out_cont; 360 361 mutex_lock(&dev->mutex); 362 363 if (sl && w1_reset_select_slave(sl)) { 364 err = -ENODEV; 365 goto out_up; 366 } 367 368 while (mlen) { 369 cmd = (struct w1_netlink_cmd *)cmd_data; 370 371 if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) { 372 err = -E2BIG; 373 break; 374 } 375 376 if (sl) 377 err = w1_process_command_slave(sl, msg, m, cmd); 378 else 379 err = w1_process_command_master(dev, msg, m, cmd); 380 381 w1_netlink_send_error(msg, m, cmd, err); 382 err = 0; 383 384 cmd_data += cmd->len + sizeof(struct w1_netlink_cmd); 385 mlen -= cmd->len + sizeof(struct w1_netlink_cmd); 386 } 387 out_up: 388 atomic_dec(&dev->refcnt); 389 if (sl) 390 atomic_dec(&sl->refcnt); 391 mutex_unlock(&dev->mutex); 392 out_cont: 393 if (!cmd || err) 394 w1_netlink_send_error(msg, m, cmd, err); 395 msg->len -= sizeof(struct w1_netlink_msg) + m->len; 396 m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len); 397 398 /* 399 * Let's allow requests for nonexisting devices. 400 */ 401 if (err == -ENODEV) 402 err = 0; 403 } 404 } 405 406 int w1_init_netlink(void) 407 { 408 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL}; 409 410 return cn_add_callback(&w1_id, "w1", &w1_cn_callback); 411 } 412 413 void w1_fini_netlink(void) 414 { 415 struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL}; 416 417 cn_del_callback(&w1_id); 418 } 419 #else 420 void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg) 421 { 422 } 423 424 int w1_init_netlink(void) 425 { 426 return 0; 427 } 428 429 void w1_fini_netlink(void) 430 { 431 } 432 #endif 433