Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1 | /* |
| 2 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content |
| 3 | * |
| 4 | * Copyright (c) 2002-2007 Volkswagen Group Electronic Research |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of Volkswagen nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * Alternatively, provided that this notice is retained in full, this |
| 20 | * software may be distributed under the terms of the GNU General |
| 21 | * Public License ("GPL") version 2, in which case the provisions of the |
| 22 | * GPL apply INSTEAD OF those given above. |
| 23 | * |
| 24 | * The provided data structures and external interfaces from this code |
| 25 | * are not restricted to be used by modules with a GPL compatible license. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 38 | * DAMAGE. |
| 39 | * |
| 40 | * Send feedback to <socketcan-users@lists.berlios.de> |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | #include <linux/module.h> |
| 45 | #include <linux/init.h> |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 46 | #include <linux/hrtimer.h> |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 47 | #include <linux/list.h> |
| 48 | #include <linux/proc_fs.h> |
| 49 | #include <linux/uio.h> |
| 50 | #include <linux/net.h> |
| 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/socket.h> |
| 53 | #include <linux/if_arp.h> |
| 54 | #include <linux/skbuff.h> |
| 55 | #include <linux/can.h> |
| 56 | #include <linux/can/core.h> |
| 57 | #include <linux/can/bcm.h> |
| 58 | #include <net/sock.h> |
| 59 | #include <net/net_namespace.h> |
| 60 | |
| 61 | /* use of last_frames[index].can_dlc */ |
| 62 | #define RX_RECV 0x40 /* received data for this element */ |
| 63 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ |
| 64 | #define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */ |
| 65 | |
| 66 | /* get best masking value for can_rx_register() for a given single can_id */ |
Oliver Hartkopp | d253eee | 2008-12-03 15:52:35 -0800 | [diff] [blame] | 67 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
| 68 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ |
| 69 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 70 | |
Oliver Hartkopp | d253eee | 2008-12-03 15:52:35 -0800 | [diff] [blame] | 71 | #define CAN_BCM_VERSION CAN_VERSION |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 72 | static __initdata const char banner[] = KERN_INFO |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 73 | "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 74 | |
| 75 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); |
| 76 | MODULE_LICENSE("Dual BSD/GPL"); |
| 77 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); |
| 78 | |
| 79 | /* easy access to can_frame payload */ |
| 80 | static inline u64 GET_U64(const struct can_frame *cp) |
| 81 | { |
| 82 | return *(u64 *)cp->data; |
| 83 | } |
| 84 | |
| 85 | struct bcm_op { |
| 86 | struct list_head list; |
| 87 | int ifindex; |
| 88 | canid_t can_id; |
| 89 | int flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 90 | unsigned long frames_abs, frames_filtered; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 91 | struct timeval ival1, ival2; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 92 | struct hrtimer timer, thrtimer; |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 93 | struct tasklet_struct tsklet, thrtsklet; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 94 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 95 | int rx_ifindex; |
| 96 | int count; |
| 97 | int nframes; |
| 98 | int currframe; |
| 99 | struct can_frame *frames; |
| 100 | struct can_frame *last_frames; |
| 101 | struct can_frame sframe; |
| 102 | struct can_frame last_sframe; |
| 103 | struct sock *sk; |
| 104 | struct net_device *rx_reg_dev; |
| 105 | }; |
| 106 | |
| 107 | static struct proc_dir_entry *proc_dir; |
| 108 | |
| 109 | struct bcm_sock { |
| 110 | struct sock sk; |
| 111 | int bound; |
| 112 | int ifindex; |
| 113 | struct notifier_block notifier; |
| 114 | struct list_head rx_ops; |
| 115 | struct list_head tx_ops; |
| 116 | unsigned long dropped_usr_msgs; |
| 117 | struct proc_dir_entry *bcm_proc_read; |
| 118 | char procname [9]; /* pointer printed in ASCII with \0 */ |
| 119 | }; |
| 120 | |
| 121 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) |
| 122 | { |
| 123 | return (struct bcm_sock *)sk; |
| 124 | } |
| 125 | |
| 126 | #define CFSIZ sizeof(struct can_frame) |
| 127 | #define OPSIZ sizeof(struct bcm_op) |
| 128 | #define MHSIZ sizeof(struct bcm_msg_head) |
| 129 | |
| 130 | /* |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 131 | * procfs functions |
| 132 | */ |
| 133 | static char *bcm_proc_getifname(int ifindex) |
| 134 | { |
| 135 | struct net_device *dev; |
| 136 | |
| 137 | if (!ifindex) |
| 138 | return "any"; |
| 139 | |
| 140 | /* no usage counting */ |
| 141 | dev = __dev_get_by_index(&init_net, ifindex); |
| 142 | if (dev) |
| 143 | return dev->name; |
| 144 | |
| 145 | return "???"; |
| 146 | } |
| 147 | |
| 148 | static int bcm_read_proc(char *page, char **start, off_t off, |
| 149 | int count, int *eof, void *data) |
| 150 | { |
| 151 | int len = 0; |
| 152 | struct sock *sk = (struct sock *)data; |
| 153 | struct bcm_sock *bo = bcm_sk(sk); |
| 154 | struct bcm_op *op; |
| 155 | |
| 156 | len += snprintf(page + len, PAGE_SIZE - len, ">>> socket %p", |
| 157 | sk->sk_socket); |
| 158 | len += snprintf(page + len, PAGE_SIZE - len, " / sk %p", sk); |
| 159 | len += snprintf(page + len, PAGE_SIZE - len, " / bo %p", bo); |
| 160 | len += snprintf(page + len, PAGE_SIZE - len, " / dropped %lu", |
| 161 | bo->dropped_usr_msgs); |
| 162 | len += snprintf(page + len, PAGE_SIZE - len, " / bound %s", |
| 163 | bcm_proc_getifname(bo->ifindex)); |
| 164 | len += snprintf(page + len, PAGE_SIZE - len, " <<<\n"); |
| 165 | |
| 166 | list_for_each_entry(op, &bo->rx_ops, list) { |
| 167 | |
| 168 | unsigned long reduction; |
| 169 | |
| 170 | /* print only active entries & prevent division by zero */ |
| 171 | if (!op->frames_abs) |
| 172 | continue; |
| 173 | |
| 174 | len += snprintf(page + len, PAGE_SIZE - len, |
| 175 | "rx_op: %03X %-5s ", |
| 176 | op->can_id, bcm_proc_getifname(op->ifindex)); |
| 177 | len += snprintf(page + len, PAGE_SIZE - len, "[%d]%c ", |
| 178 | op->nframes, |
| 179 | (op->flags & RX_CHECK_DLC)?'d':' '); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 180 | if (op->kt_ival1.tv64) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 181 | len += snprintf(page + len, PAGE_SIZE - len, |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 182 | "timeo=%lld ", |
| 183 | (long long) |
| 184 | ktime_to_us(op->kt_ival1)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 185 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 186 | if (op->kt_ival2.tv64) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 187 | len += snprintf(page + len, PAGE_SIZE - len, |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 188 | "thr=%lld ", |
| 189 | (long long) |
| 190 | ktime_to_us(op->kt_ival2)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 191 | |
| 192 | len += snprintf(page + len, PAGE_SIZE - len, |
| 193 | "# recv %ld (%ld) => reduction: ", |
| 194 | op->frames_filtered, op->frames_abs); |
| 195 | |
| 196 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; |
| 197 | |
| 198 | len += snprintf(page + len, PAGE_SIZE - len, "%s%ld%%\n", |
| 199 | (reduction == 100)?"near ":"", reduction); |
| 200 | |
| 201 | if (len > PAGE_SIZE - 200) { |
| 202 | /* mark output cut off */ |
| 203 | len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | list_for_each_entry(op, &bo->tx_ops, list) { |
| 209 | |
| 210 | len += snprintf(page + len, PAGE_SIZE - len, |
| 211 | "tx_op: %03X %s [%d] ", |
| 212 | op->can_id, bcm_proc_getifname(op->ifindex), |
| 213 | op->nframes); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 214 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 215 | if (op->kt_ival1.tv64) |
| 216 | len += snprintf(page + len, PAGE_SIZE - len, "t1=%lld ", |
| 217 | (long long) ktime_to_us(op->kt_ival1)); |
| 218 | |
| 219 | if (op->kt_ival2.tv64) |
| 220 | len += snprintf(page + len, PAGE_SIZE - len, "t2=%lld ", |
| 221 | (long long) ktime_to_us(op->kt_ival2)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 222 | |
| 223 | len += snprintf(page + len, PAGE_SIZE - len, "# sent %ld\n", |
| 224 | op->frames_abs); |
| 225 | |
| 226 | if (len > PAGE_SIZE - 100) { |
| 227 | /* mark output cut off */ |
| 228 | len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); |
| 229 | break; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | len += snprintf(page + len, PAGE_SIZE - len, "\n"); |
| 234 | |
| 235 | *eof = 1; |
| 236 | return len; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface |
| 241 | * of the given bcm tx op |
| 242 | */ |
| 243 | static void bcm_can_tx(struct bcm_op *op) |
| 244 | { |
| 245 | struct sk_buff *skb; |
| 246 | struct net_device *dev; |
| 247 | struct can_frame *cf = &op->frames[op->currframe]; |
| 248 | |
| 249 | /* no target device? => exit */ |
| 250 | if (!op->ifindex) |
| 251 | return; |
| 252 | |
| 253 | dev = dev_get_by_index(&init_net, op->ifindex); |
| 254 | if (!dev) { |
| 255 | /* RFC: should this bcm_op remove itself here? */ |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | skb = alloc_skb(CFSIZ, gfp_any()); |
| 260 | if (!skb) |
| 261 | goto out; |
| 262 | |
| 263 | memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); |
| 264 | |
| 265 | /* send with loopback */ |
| 266 | skb->dev = dev; |
| 267 | skb->sk = op->sk; |
| 268 | can_send(skb, 1); |
| 269 | |
| 270 | /* update statistics */ |
| 271 | op->currframe++; |
| 272 | op->frames_abs++; |
| 273 | |
| 274 | /* reached last frame? */ |
| 275 | if (op->currframe >= op->nframes) |
| 276 | op->currframe = 0; |
| 277 | out: |
| 278 | dev_put(dev); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * bcm_send_to_user - send a BCM message to the userspace |
| 283 | * (consisting of bcm_msg_head + x CAN frames) |
| 284 | */ |
| 285 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, |
| 286 | struct can_frame *frames, int has_timestamp) |
| 287 | { |
| 288 | struct sk_buff *skb; |
| 289 | struct can_frame *firstframe; |
| 290 | struct sockaddr_can *addr; |
| 291 | struct sock *sk = op->sk; |
| 292 | int datalen = head->nframes * CFSIZ; |
| 293 | int err; |
| 294 | |
| 295 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); |
| 296 | if (!skb) |
| 297 | return; |
| 298 | |
| 299 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); |
| 300 | |
| 301 | if (head->nframes) { |
| 302 | /* can_frames starting here */ |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 303 | firstframe = (struct can_frame *)skb_tail_pointer(skb); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 304 | |
| 305 | memcpy(skb_put(skb, datalen), frames, datalen); |
| 306 | |
| 307 | /* |
| 308 | * the BCM uses the can_dlc-element of the can_frame |
| 309 | * structure for internal purposes. This is only |
| 310 | * relevant for updates that are generated by the |
| 311 | * BCM, where nframes is 1 |
| 312 | */ |
| 313 | if (head->nframes == 1) |
| 314 | firstframe->can_dlc &= BCM_CAN_DLC_MASK; |
| 315 | } |
| 316 | |
| 317 | if (has_timestamp) { |
| 318 | /* restore rx timestamp */ |
| 319 | skb->tstamp = op->rx_stamp; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Put the datagram to the queue so that bcm_recvmsg() can |
| 324 | * get it from there. We need to pass the interface index to |
| 325 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb |
| 326 | * containing the interface index. |
| 327 | */ |
| 328 | |
| 329 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); |
| 330 | addr = (struct sockaddr_can *)skb->cb; |
| 331 | memset(addr, 0, sizeof(*addr)); |
| 332 | addr->can_family = AF_CAN; |
| 333 | addr->can_ifindex = op->rx_ifindex; |
| 334 | |
| 335 | err = sock_queue_rcv_skb(sk, skb); |
| 336 | if (err < 0) { |
| 337 | struct bcm_sock *bo = bcm_sk(sk); |
| 338 | |
| 339 | kfree_skb(skb); |
| 340 | /* don't care about overflows in this statistic */ |
| 341 | bo->dropped_usr_msgs++; |
| 342 | } |
| 343 | } |
| 344 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 345 | static void bcm_tx_timeout_tsklet(unsigned long data) |
| 346 | { |
| 347 | struct bcm_op *op = (struct bcm_op *)data; |
| 348 | struct bcm_msg_head msg_head; |
| 349 | |
| 350 | /* create notification to user */ |
| 351 | msg_head.opcode = TX_EXPIRED; |
| 352 | msg_head.flags = op->flags; |
| 353 | msg_head.count = op->count; |
| 354 | msg_head.ival1 = op->ival1; |
| 355 | msg_head.ival2 = op->ival2; |
| 356 | msg_head.can_id = op->can_id; |
| 357 | msg_head.nframes = 0; |
| 358 | |
| 359 | bcm_send_to_user(op, &msg_head, NULL, 0); |
| 360 | } |
| 361 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 362 | /* |
| 363 | * bcm_tx_timeout_handler - performes cyclic CAN frame transmissions |
| 364 | */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 365 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 366 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 367 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); |
| 368 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 369 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 370 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 371 | |
| 372 | op->count--; |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 373 | if (!op->count && (op->flags & TX_COUNTEVT)) |
| 374 | tasklet_schedule(&op->tsklet); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 375 | } |
| 376 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 377 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 378 | |
| 379 | /* send (next) frame */ |
| 380 | bcm_can_tx(op); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 381 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival1); |
| 382 | ret = HRTIMER_RESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 383 | |
| 384 | } else { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 385 | if (op->kt_ival2.tv64) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 386 | |
| 387 | /* send (next) frame */ |
| 388 | bcm_can_tx(op); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 389 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
| 390 | ret = HRTIMER_RESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 391 | } |
| 392 | } |
| 393 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 394 | return ret; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* |
| 398 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content |
| 399 | */ |
| 400 | static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) |
| 401 | { |
| 402 | struct bcm_msg_head head; |
| 403 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 404 | /* update statistics */ |
| 405 | op->frames_filtered++; |
| 406 | |
| 407 | /* prevent statistics overflow */ |
| 408 | if (op->frames_filtered > ULONG_MAX/100) |
| 409 | op->frames_filtered = op->frames_abs = 0; |
| 410 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 411 | /* this element is not throttled anymore */ |
| 412 | data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); |
| 413 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 414 | head.opcode = RX_CHANGED; |
| 415 | head.flags = op->flags; |
| 416 | head.count = op->count; |
| 417 | head.ival1 = op->ival1; |
| 418 | head.ival2 = op->ival2; |
| 419 | head.can_id = op->can_id; |
| 420 | head.nframes = 1; |
| 421 | |
| 422 | bcm_send_to_user(op, &head, data, 1); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * bcm_rx_update_and_send - process a detected relevant receive content change |
| 427 | * 1. update the last received data |
| 428 | * 2. send a notification to the user (if possible) |
| 429 | */ |
| 430 | static void bcm_rx_update_and_send(struct bcm_op *op, |
| 431 | struct can_frame *lastdata, |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 432 | const struct can_frame *rxdata) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 433 | { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 434 | memcpy(lastdata, rxdata, CFSIZ); |
| 435 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 436 | /* mark as used and throttled by default */ |
| 437 | lastdata->can_dlc |= (RX_RECV|RX_THR); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 438 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 439 | /* throtteling mode inactive ? */ |
| 440 | if (!op->kt_ival2.tv64) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 441 | /* send RX_CHANGED to the user immediately */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 442 | bcm_rx_changed(op, lastdata); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 443 | return; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 444 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 445 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 446 | /* with active throttling timer we are just done here */ |
| 447 | if (hrtimer_active(&op->thrtimer)) |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 448 | return; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 449 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 450 | /* first receiption with enabled throttling mode */ |
| 451 | if (!op->kt_lastmsg.tv64) |
| 452 | goto rx_changed_settime; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 453 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 454 | /* got a second frame inside a potential throttle period? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 455 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
| 456 | ktime_to_us(op->kt_ival2)) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 457 | /* do not send the saved data - only start throttle timer */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 458 | hrtimer_start(&op->thrtimer, |
| 459 | ktime_add(op->kt_lastmsg, op->kt_ival2), |
| 460 | HRTIMER_MODE_ABS); |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | /* the gap was that big, that throttling was not needed here */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 465 | rx_changed_settime: |
| 466 | bcm_rx_changed(op, lastdata); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 467 | op->kt_lastmsg = ktime_get(); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 468 | } |
| 469 | |
| 470 | /* |
| 471 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly |
| 472 | * received data stored in op->last_frames[] |
| 473 | */ |
| 474 | static void bcm_rx_cmp_to_index(struct bcm_op *op, int index, |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 475 | const struct can_frame *rxdata) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 476 | { |
| 477 | /* |
| 478 | * no one uses the MSBs of can_dlc for comparation, |
| 479 | * so we use it here to detect the first time of reception |
| 480 | */ |
| 481 | |
| 482 | if (!(op->last_frames[index].can_dlc & RX_RECV)) { |
| 483 | /* received data for the first time => send update to user */ |
| 484 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | /* do a real check in can_frame data section */ |
| 489 | |
| 490 | if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != |
| 491 | (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { |
| 492 | bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); |
| 493 | return; |
| 494 | } |
| 495 | |
| 496 | if (op->flags & RX_CHECK_DLC) { |
| 497 | /* do a real check in can_frame dlc */ |
| 498 | if (rxdata->can_dlc != (op->last_frames[index].can_dlc & |
| 499 | BCM_CAN_DLC_MASK)) { |
| 500 | bcm_rx_update_and_send(op, &op->last_frames[index], |
| 501 | rxdata); |
| 502 | return; |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption |
| 509 | */ |
| 510 | static void bcm_rx_starttimer(struct bcm_op *op) |
| 511 | { |
| 512 | if (op->flags & RX_NO_AUTOTIMER) |
| 513 | return; |
| 514 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 515 | if (op->kt_ival1.tv64) |
| 516 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 517 | } |
| 518 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 519 | static void bcm_rx_timeout_tsklet(unsigned long data) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 520 | { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 521 | struct bcm_op *op = (struct bcm_op *)data; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 522 | struct bcm_msg_head msg_head; |
| 523 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 524 | /* create notification to user */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 525 | msg_head.opcode = RX_TIMEOUT; |
| 526 | msg_head.flags = op->flags; |
| 527 | msg_head.count = op->count; |
| 528 | msg_head.ival1 = op->ival1; |
| 529 | msg_head.ival2 = op->ival2; |
| 530 | msg_head.can_id = op->can_id; |
| 531 | msg_head.nframes = 0; |
| 532 | |
| 533 | bcm_send_to_user(op, &msg_head, NULL, 0); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | /* |
| 537 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out |
| 538 | */ |
| 539 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) |
| 540 | { |
| 541 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); |
| 542 | |
| 543 | /* schedule before NET_RX_SOFTIRQ */ |
| 544 | tasklet_hi_schedule(&op->tsklet); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 545 | |
| 546 | /* no restart of the timer is done here! */ |
| 547 | |
| 548 | /* if user wants to be informed, when cyclic CAN-Messages come back */ |
| 549 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { |
| 550 | /* clear received can_frames to indicate 'nothing received' */ |
| 551 | memset(op->last_frames, 0, op->nframes * CFSIZ); |
| 552 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 553 | |
| 554 | return HRTIMER_NORESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | /* |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 558 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 559 | */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 560 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, int index) |
| 561 | { |
| 562 | if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) { |
| 563 | if (update) |
| 564 | bcm_rx_changed(op, &op->last_frames[index]); |
| 565 | return 1; |
| 566 | } |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
| 572 | * |
| 573 | * update == 0 : just check if throttled data is available (any irq context) |
| 574 | * update == 1 : check and send throttled data to userspace (soft_irq context) |
| 575 | */ |
| 576 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 577 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 578 | int updated = 0; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 579 | |
| 580 | if (op->nframes > 1) { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 581 | int i; |
| 582 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 583 | /* for MUX filter we start at index 1 */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 584 | for (i = 1; i < op->nframes; i++) |
| 585 | updated += bcm_rx_do_flush(op, update, i); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 586 | |
| 587 | } else { |
| 588 | /* for RX_FILTER_ID and simple filter */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 589 | updated += bcm_rx_do_flush(op, update, 0); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 590 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 591 | |
| 592 | return updated; |
| 593 | } |
| 594 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 595 | static void bcm_rx_thr_tsklet(unsigned long data) |
| 596 | { |
| 597 | struct bcm_op *op = (struct bcm_op *)data; |
| 598 | |
| 599 | /* push the changed data to the userspace */ |
| 600 | bcm_rx_thr_flush(op, 1); |
| 601 | } |
| 602 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 603 | /* |
| 604 | * bcm_rx_thr_handler - the time for blocked content updates is over now: |
| 605 | * Check for throttled data and send it to the userspace |
| 606 | */ |
| 607 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) |
| 608 | { |
| 609 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); |
| 610 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 611 | tasklet_schedule(&op->thrtsklet); |
| 612 | |
| 613 | if (bcm_rx_thr_flush(op, 0)) { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 614 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
| 615 | return HRTIMER_RESTART; |
| 616 | } else { |
| 617 | /* rearm throttle handling */ |
| 618 | op->kt_lastmsg = ktime_set(0, 0); |
| 619 | return HRTIMER_NORESTART; |
| 620 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 621 | } |
| 622 | |
| 623 | /* |
| 624 | * bcm_rx_handler - handle a CAN frame receiption |
| 625 | */ |
| 626 | static void bcm_rx_handler(struct sk_buff *skb, void *data) |
| 627 | { |
| 628 | struct bcm_op *op = (struct bcm_op *)data; |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 629 | const struct can_frame *rxframe = (struct can_frame *)skb->data; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 630 | int i; |
| 631 | |
| 632 | /* disable timeout */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 633 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 634 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 635 | if (op->can_id != rxframe->can_id) |
| 636 | goto rx_freeskb; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 637 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 638 | /* save rx timestamp */ |
| 639 | op->rx_stamp = skb->tstamp; |
| 640 | /* save originator for recvfrom() */ |
| 641 | op->rx_ifindex = skb->dev->ifindex; |
| 642 | /* update statistics */ |
| 643 | op->frames_abs++; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 644 | |
| 645 | if (op->flags & RX_RTR_FRAME) { |
| 646 | /* send reply for RTR-request (placed in op->frames[0]) */ |
| 647 | bcm_can_tx(op); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 648 | goto rx_freeskb; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | if (op->flags & RX_FILTER_ID) { |
| 652 | /* the easiest case */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 653 | bcm_rx_update_and_send(op, &op->last_frames[0], rxframe); |
| 654 | goto rx_freeskb_starttimer; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | if (op->nframes == 1) { |
| 658 | /* simple compare with index 0 */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 659 | bcm_rx_cmp_to_index(op, 0, rxframe); |
| 660 | goto rx_freeskb_starttimer; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | if (op->nframes > 1) { |
| 664 | /* |
| 665 | * multiplex compare |
| 666 | * |
| 667 | * find the first multiplex mask that fits. |
| 668 | * Remark: The MUX-mask is stored in index 0 |
| 669 | */ |
| 670 | |
| 671 | for (i = 1; i < op->nframes; i++) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 672 | if ((GET_U64(&op->frames[0]) & GET_U64(rxframe)) == |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 673 | (GET_U64(&op->frames[0]) & |
| 674 | GET_U64(&op->frames[i]))) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 675 | bcm_rx_cmp_to_index(op, i, rxframe); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 676 | break; |
| 677 | } |
| 678 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 679 | } |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 680 | |
| 681 | rx_freeskb_starttimer: |
| 682 | bcm_rx_starttimer(op); |
| 683 | rx_freeskb: |
| 684 | kfree_skb(skb); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | /* |
| 688 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements |
| 689 | */ |
| 690 | static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, |
| 691 | int ifindex) |
| 692 | { |
| 693 | struct bcm_op *op; |
| 694 | |
| 695 | list_for_each_entry(op, ops, list) { |
| 696 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) |
| 697 | return op; |
| 698 | } |
| 699 | |
| 700 | return NULL; |
| 701 | } |
| 702 | |
| 703 | static void bcm_remove_op(struct bcm_op *op) |
| 704 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 705 | hrtimer_cancel(&op->timer); |
| 706 | hrtimer_cancel(&op->thrtimer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 707 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 708 | if (op->tsklet.func) |
| 709 | tasklet_kill(&op->tsklet); |
| 710 | |
| 711 | if (op->thrtsklet.func) |
| 712 | tasklet_kill(&op->thrtsklet); |
| 713 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 714 | if ((op->frames) && (op->frames != &op->sframe)) |
| 715 | kfree(op->frames); |
| 716 | |
| 717 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) |
| 718 | kfree(op->last_frames); |
| 719 | |
| 720 | kfree(op); |
| 721 | |
| 722 | return; |
| 723 | } |
| 724 | |
| 725 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) |
| 726 | { |
| 727 | if (op->rx_reg_dev == dev) { |
| 728 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), |
| 729 | bcm_rx_handler, op); |
| 730 | |
| 731 | /* mark as removed subscription */ |
| 732 | op->rx_reg_dev = NULL; |
| 733 | } else |
| 734 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " |
| 735 | "mismatch %p %p\n", op->rx_reg_dev, dev); |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) |
| 740 | */ |
| 741 | static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) |
| 742 | { |
| 743 | struct bcm_op *op, *n; |
| 744 | |
| 745 | list_for_each_entry_safe(op, n, ops, list) { |
| 746 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { |
| 747 | |
| 748 | /* |
| 749 | * Don't care if we're bound or not (due to netdev |
| 750 | * problems) can_rx_unregister() is always a save |
| 751 | * thing to do here. |
| 752 | */ |
| 753 | if (op->ifindex) { |
| 754 | /* |
| 755 | * Only remove subscriptions that had not |
| 756 | * been removed due to NETDEV_UNREGISTER |
| 757 | * in bcm_notifier() |
| 758 | */ |
| 759 | if (op->rx_reg_dev) { |
| 760 | struct net_device *dev; |
| 761 | |
| 762 | dev = dev_get_by_index(&init_net, |
| 763 | op->ifindex); |
| 764 | if (dev) { |
| 765 | bcm_rx_unreg(dev, op); |
| 766 | dev_put(dev); |
| 767 | } |
| 768 | } |
| 769 | } else |
| 770 | can_rx_unregister(NULL, op->can_id, |
| 771 | REGMASK(op->can_id), |
| 772 | bcm_rx_handler, op); |
| 773 | |
| 774 | list_del(&op->list); |
| 775 | bcm_remove_op(op); |
| 776 | return 1; /* done */ |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | return 0; /* not found */ |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) |
| 785 | */ |
| 786 | static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) |
| 787 | { |
| 788 | struct bcm_op *op, *n; |
| 789 | |
| 790 | list_for_each_entry_safe(op, n, ops, list) { |
| 791 | if ((op->can_id == can_id) && (op->ifindex == ifindex)) { |
| 792 | list_del(&op->list); |
| 793 | bcm_remove_op(op); |
| 794 | return 1; /* done */ |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | return 0; /* not found */ |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) |
| 803 | */ |
| 804 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, |
| 805 | int ifindex) |
| 806 | { |
| 807 | struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex); |
| 808 | |
| 809 | if (!op) |
| 810 | return -EINVAL; |
| 811 | |
| 812 | /* put current values into msg_head */ |
| 813 | msg_head->flags = op->flags; |
| 814 | msg_head->count = op->count; |
| 815 | msg_head->ival1 = op->ival1; |
| 816 | msg_head->ival2 = op->ival2; |
| 817 | msg_head->nframes = op->nframes; |
| 818 | |
| 819 | bcm_send_to_user(op, msg_head, op->frames, 0); |
| 820 | |
| 821 | return MHSIZ; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) |
| 826 | */ |
| 827 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, |
| 828 | int ifindex, struct sock *sk) |
| 829 | { |
| 830 | struct bcm_sock *bo = bcm_sk(sk); |
| 831 | struct bcm_op *op; |
| 832 | int i, err; |
| 833 | |
| 834 | /* we need a real device to send frames */ |
| 835 | if (!ifindex) |
| 836 | return -ENODEV; |
| 837 | |
| 838 | /* we need at least one can_frame */ |
| 839 | if (msg_head->nframes < 1) |
| 840 | return -EINVAL; |
| 841 | |
| 842 | /* check the given can_id */ |
| 843 | op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); |
| 844 | |
| 845 | if (op) { |
| 846 | /* update existing BCM operation */ |
| 847 | |
| 848 | /* |
| 849 | * Do we need more space for the can_frames than currently |
| 850 | * allocated? -> This is a _really_ unusual use-case and |
| 851 | * therefore (complexity / locking) it is not supported. |
| 852 | */ |
| 853 | if (msg_head->nframes > op->nframes) |
| 854 | return -E2BIG; |
| 855 | |
| 856 | /* update can_frames content */ |
| 857 | for (i = 0; i < msg_head->nframes; i++) { |
| 858 | err = memcpy_fromiovec((u8 *)&op->frames[i], |
| 859 | msg->msg_iov, CFSIZ); |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 860 | |
| 861 | if (op->frames[i].can_dlc > 8) |
| 862 | err = -EINVAL; |
| 863 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 864 | if (err < 0) |
| 865 | return err; |
| 866 | |
| 867 | if (msg_head->flags & TX_CP_CAN_ID) { |
| 868 | /* copy can_id into frame */ |
| 869 | op->frames[i].can_id = msg_head->can_id; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | } else { |
| 874 | /* insert new BCM operation for the given can_id */ |
| 875 | |
| 876 | op = kzalloc(OPSIZ, GFP_KERNEL); |
| 877 | if (!op) |
| 878 | return -ENOMEM; |
| 879 | |
| 880 | op->can_id = msg_head->can_id; |
| 881 | |
| 882 | /* create array for can_frames and copy the data */ |
| 883 | if (msg_head->nframes > 1) { |
| 884 | op->frames = kmalloc(msg_head->nframes * CFSIZ, |
| 885 | GFP_KERNEL); |
| 886 | if (!op->frames) { |
| 887 | kfree(op); |
| 888 | return -ENOMEM; |
| 889 | } |
| 890 | } else |
| 891 | op->frames = &op->sframe; |
| 892 | |
| 893 | for (i = 0; i < msg_head->nframes; i++) { |
| 894 | err = memcpy_fromiovec((u8 *)&op->frames[i], |
| 895 | msg->msg_iov, CFSIZ); |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 896 | |
| 897 | if (op->frames[i].can_dlc > 8) |
| 898 | err = -EINVAL; |
| 899 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 900 | if (err < 0) { |
| 901 | if (op->frames != &op->sframe) |
| 902 | kfree(op->frames); |
| 903 | kfree(op); |
| 904 | return err; |
| 905 | } |
| 906 | |
| 907 | if (msg_head->flags & TX_CP_CAN_ID) { |
| 908 | /* copy can_id into frame */ |
| 909 | op->frames[i].can_id = msg_head->can_id; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | /* tx_ops never compare with previous received messages */ |
| 914 | op->last_frames = NULL; |
| 915 | |
| 916 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ |
| 917 | op->sk = sk; |
| 918 | op->ifindex = ifindex; |
| 919 | |
| 920 | /* initialize uninitialized (kzalloc) structure */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 921 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 922 | op->timer.function = bcm_tx_timeout_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 923 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 924 | /* initialize tasklet for tx countevent notification */ |
| 925 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, |
| 926 | (unsigned long) op); |
| 927 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 928 | /* currently unused in tx_ops */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 929 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 930 | |
| 931 | /* add this bcm_op to the list of the tx_ops */ |
| 932 | list_add(&op->list, &bo->tx_ops); |
| 933 | |
| 934 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ |
| 935 | |
| 936 | if (op->nframes != msg_head->nframes) { |
| 937 | op->nframes = msg_head->nframes; |
| 938 | /* start multiple frame transmission with index 0 */ |
| 939 | op->currframe = 0; |
| 940 | } |
| 941 | |
| 942 | /* check flags */ |
| 943 | |
| 944 | op->flags = msg_head->flags; |
| 945 | |
| 946 | if (op->flags & TX_RESET_MULTI_IDX) { |
| 947 | /* start multiple frame transmission with index 0 */ |
| 948 | op->currframe = 0; |
| 949 | } |
| 950 | |
| 951 | if (op->flags & SETTIMER) { |
| 952 | /* set timer values */ |
| 953 | op->count = msg_head->count; |
| 954 | op->ival1 = msg_head->ival1; |
| 955 | op->ival2 = msg_head->ival2; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 956 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
| 957 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 958 | |
| 959 | /* disable an active timer due to zero values? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 960 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
| 961 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | if ((op->flags & STARTTIMER) && |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 965 | ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 966 | |
| 967 | /* spec: send can_frame when starting timer */ |
| 968 | op->flags |= TX_ANNOUNCE; |
| 969 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 970 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 971 | /* op->count-- is done in bcm_tx_timeout_handler */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 972 | hrtimer_start(&op->timer, op->kt_ival1, |
| 973 | HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 974 | } else |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 975 | hrtimer_start(&op->timer, op->kt_ival2, |
| 976 | HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | if (op->flags & TX_ANNOUNCE) |
| 980 | bcm_can_tx(op); |
| 981 | |
| 982 | return msg_head->nframes * CFSIZ + MHSIZ; |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) |
| 987 | */ |
| 988 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, |
| 989 | int ifindex, struct sock *sk) |
| 990 | { |
| 991 | struct bcm_sock *bo = bcm_sk(sk); |
| 992 | struct bcm_op *op; |
| 993 | int do_rx_register; |
| 994 | int err = 0; |
| 995 | |
| 996 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { |
| 997 | /* be robust against wrong usage ... */ |
| 998 | msg_head->flags |= RX_FILTER_ID; |
| 999 | /* ignore trailing garbage */ |
| 1000 | msg_head->nframes = 0; |
| 1001 | } |
| 1002 | |
| 1003 | if ((msg_head->flags & RX_RTR_FRAME) && |
| 1004 | ((msg_head->nframes != 1) || |
| 1005 | (!(msg_head->can_id & CAN_RTR_FLAG)))) |
| 1006 | return -EINVAL; |
| 1007 | |
| 1008 | /* check the given can_id */ |
| 1009 | op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex); |
| 1010 | if (op) { |
| 1011 | /* update existing BCM operation */ |
| 1012 | |
| 1013 | /* |
| 1014 | * Do we need more space for the can_frames than currently |
| 1015 | * allocated? -> This is a _really_ unusual use-case and |
| 1016 | * therefore (complexity / locking) it is not supported. |
| 1017 | */ |
| 1018 | if (msg_head->nframes > op->nframes) |
| 1019 | return -E2BIG; |
| 1020 | |
| 1021 | if (msg_head->nframes) { |
| 1022 | /* update can_frames content */ |
| 1023 | err = memcpy_fromiovec((u8 *)op->frames, |
| 1024 | msg->msg_iov, |
| 1025 | msg_head->nframes * CFSIZ); |
| 1026 | if (err < 0) |
| 1027 | return err; |
| 1028 | |
| 1029 | /* clear last_frames to indicate 'nothing received' */ |
| 1030 | memset(op->last_frames, 0, msg_head->nframes * CFSIZ); |
| 1031 | } |
| 1032 | |
| 1033 | op->nframes = msg_head->nframes; |
| 1034 | |
| 1035 | /* Only an update -> do not call can_rx_register() */ |
| 1036 | do_rx_register = 0; |
| 1037 | |
| 1038 | } else { |
| 1039 | /* insert new BCM operation for the given can_id */ |
| 1040 | op = kzalloc(OPSIZ, GFP_KERNEL); |
| 1041 | if (!op) |
| 1042 | return -ENOMEM; |
| 1043 | |
| 1044 | op->can_id = msg_head->can_id; |
| 1045 | op->nframes = msg_head->nframes; |
| 1046 | |
| 1047 | if (msg_head->nframes > 1) { |
| 1048 | /* create array for can_frames and copy the data */ |
| 1049 | op->frames = kmalloc(msg_head->nframes * CFSIZ, |
| 1050 | GFP_KERNEL); |
| 1051 | if (!op->frames) { |
| 1052 | kfree(op); |
| 1053 | return -ENOMEM; |
| 1054 | } |
| 1055 | |
| 1056 | /* create and init array for received can_frames */ |
| 1057 | op->last_frames = kzalloc(msg_head->nframes * CFSIZ, |
| 1058 | GFP_KERNEL); |
| 1059 | if (!op->last_frames) { |
| 1060 | kfree(op->frames); |
| 1061 | kfree(op); |
| 1062 | return -ENOMEM; |
| 1063 | } |
| 1064 | |
| 1065 | } else { |
| 1066 | op->frames = &op->sframe; |
| 1067 | op->last_frames = &op->last_sframe; |
| 1068 | } |
| 1069 | |
| 1070 | if (msg_head->nframes) { |
| 1071 | err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, |
| 1072 | msg_head->nframes * CFSIZ); |
| 1073 | if (err < 0) { |
| 1074 | if (op->frames != &op->sframe) |
| 1075 | kfree(op->frames); |
| 1076 | if (op->last_frames != &op->last_sframe) |
| 1077 | kfree(op->last_frames); |
| 1078 | kfree(op); |
| 1079 | return err; |
| 1080 | } |
| 1081 | } |
| 1082 | |
| 1083 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ |
| 1084 | op->sk = sk; |
| 1085 | op->ifindex = ifindex; |
| 1086 | |
| 1087 | /* initialize uninitialized (kzalloc) structure */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1088 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1089 | op->timer.function = bcm_rx_timeout_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1090 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1091 | /* initialize tasklet for rx timeout notification */ |
| 1092 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, |
| 1093 | (unsigned long) op); |
| 1094 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1095 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1096 | op->thrtimer.function = bcm_rx_thr_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1097 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1098 | /* initialize tasklet for rx throttle handling */ |
| 1099 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, |
| 1100 | (unsigned long) op); |
| 1101 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1102 | /* add this bcm_op to the list of the rx_ops */ |
| 1103 | list_add(&op->list, &bo->rx_ops); |
| 1104 | |
| 1105 | /* call can_rx_register() */ |
| 1106 | do_rx_register = 1; |
| 1107 | |
| 1108 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ |
| 1109 | |
| 1110 | /* check flags */ |
| 1111 | op->flags = msg_head->flags; |
| 1112 | |
| 1113 | if (op->flags & RX_RTR_FRAME) { |
| 1114 | |
| 1115 | /* no timers in RTR-mode */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1116 | hrtimer_cancel(&op->thrtimer); |
| 1117 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1118 | |
| 1119 | /* |
| 1120 | * funny feature in RX(!)_SETUP only for RTR-mode: |
| 1121 | * copy can_id into frame BUT without RTR-flag to |
| 1122 | * prevent a full-load-loopback-test ... ;-] |
| 1123 | */ |
| 1124 | if ((op->flags & TX_CP_CAN_ID) || |
| 1125 | (op->frames[0].can_id == op->can_id)) |
| 1126 | op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG; |
| 1127 | |
| 1128 | } else { |
| 1129 | if (op->flags & SETTIMER) { |
| 1130 | |
| 1131 | /* set timer value */ |
| 1132 | op->ival1 = msg_head->ival1; |
| 1133 | op->ival2 = msg_head->ival2; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1134 | op->kt_ival1 = timeval_to_ktime(msg_head->ival1); |
| 1135 | op->kt_ival2 = timeval_to_ktime(msg_head->ival2); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1136 | |
| 1137 | /* disable an active timer due to zero value? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1138 | if (!op->kt_ival1.tv64) |
| 1139 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1140 | |
| 1141 | /* |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1142 | * In any case cancel the throttle timer, flush |
| 1143 | * potentially blocked msgs and reset throttle handling |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1144 | */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1145 | op->kt_lastmsg = ktime_set(0, 0); |
| 1146 | hrtimer_cancel(&op->thrtimer); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1147 | bcm_rx_thr_flush(op, 1); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1148 | } |
| 1149 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1150 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
| 1151 | hrtimer_start(&op->timer, op->kt_ival1, |
| 1152 | HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1153 | } |
| 1154 | |
| 1155 | /* now we can register for can_ids, if we added a new bcm_op */ |
| 1156 | if (do_rx_register) { |
| 1157 | if (ifindex) { |
| 1158 | struct net_device *dev; |
| 1159 | |
| 1160 | dev = dev_get_by_index(&init_net, ifindex); |
| 1161 | if (dev) { |
| 1162 | err = can_rx_register(dev, op->can_id, |
| 1163 | REGMASK(op->can_id), |
| 1164 | bcm_rx_handler, op, |
| 1165 | "bcm"); |
| 1166 | |
| 1167 | op->rx_reg_dev = dev; |
| 1168 | dev_put(dev); |
| 1169 | } |
| 1170 | |
| 1171 | } else |
| 1172 | err = can_rx_register(NULL, op->can_id, |
| 1173 | REGMASK(op->can_id), |
| 1174 | bcm_rx_handler, op, "bcm"); |
| 1175 | if (err) { |
| 1176 | /* this bcm rx op is broken -> remove it */ |
| 1177 | list_del(&op->list); |
| 1178 | bcm_remove_op(op); |
| 1179 | return err; |
| 1180 | } |
| 1181 | } |
| 1182 | |
| 1183 | return msg_head->nframes * CFSIZ + MHSIZ; |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) |
| 1188 | */ |
| 1189 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) |
| 1190 | { |
| 1191 | struct sk_buff *skb; |
| 1192 | struct net_device *dev; |
| 1193 | int err; |
| 1194 | |
| 1195 | /* we need a real device to send frames */ |
| 1196 | if (!ifindex) |
| 1197 | return -ENODEV; |
| 1198 | |
| 1199 | skb = alloc_skb(CFSIZ, GFP_KERNEL); |
| 1200 | |
| 1201 | if (!skb) |
| 1202 | return -ENOMEM; |
| 1203 | |
| 1204 | err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ); |
| 1205 | if (err < 0) { |
| 1206 | kfree_skb(skb); |
| 1207 | return err; |
| 1208 | } |
| 1209 | |
| 1210 | dev = dev_get_by_index(&init_net, ifindex); |
| 1211 | if (!dev) { |
| 1212 | kfree_skb(skb); |
| 1213 | return -ENODEV; |
| 1214 | } |
| 1215 | |
| 1216 | skb->dev = dev; |
| 1217 | skb->sk = sk; |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1218 | err = can_send(skb, 1); /* send with loopback */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1219 | dev_put(dev); |
| 1220 | |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1221 | if (err) |
| 1222 | return err; |
| 1223 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1224 | return CFSIZ + MHSIZ; |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace |
| 1229 | */ |
| 1230 | static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 1231 | struct msghdr *msg, size_t size) |
| 1232 | { |
| 1233 | struct sock *sk = sock->sk; |
| 1234 | struct bcm_sock *bo = bcm_sk(sk); |
| 1235 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ |
| 1236 | struct bcm_msg_head msg_head; |
| 1237 | int ret; /* read bytes or error codes as return value */ |
| 1238 | |
| 1239 | if (!bo->bound) |
| 1240 | return -ENOTCONN; |
| 1241 | |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1242 | /* check for valid message length from userspace */ |
| 1243 | if (size < MHSIZ || (size - MHSIZ) % CFSIZ) |
| 1244 | return -EINVAL; |
| 1245 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1246 | /* check for alternative ifindex for this bcm_op */ |
| 1247 | |
| 1248 | if (!ifindex && msg->msg_name) { |
| 1249 | /* no bound device as default => check msg_name */ |
| 1250 | struct sockaddr_can *addr = |
| 1251 | (struct sockaddr_can *)msg->msg_name; |
| 1252 | |
| 1253 | if (addr->can_family != AF_CAN) |
| 1254 | return -EINVAL; |
| 1255 | |
| 1256 | /* ifindex from sendto() */ |
| 1257 | ifindex = addr->can_ifindex; |
| 1258 | |
| 1259 | if (ifindex) { |
| 1260 | struct net_device *dev; |
| 1261 | |
| 1262 | dev = dev_get_by_index(&init_net, ifindex); |
| 1263 | if (!dev) |
| 1264 | return -ENODEV; |
| 1265 | |
| 1266 | if (dev->type != ARPHRD_CAN) { |
| 1267 | dev_put(dev); |
| 1268 | return -ENODEV; |
| 1269 | } |
| 1270 | |
| 1271 | dev_put(dev); |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | /* read message head information */ |
| 1276 | |
| 1277 | ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ); |
| 1278 | if (ret < 0) |
| 1279 | return ret; |
| 1280 | |
| 1281 | lock_sock(sk); |
| 1282 | |
| 1283 | switch (msg_head.opcode) { |
| 1284 | |
| 1285 | case TX_SETUP: |
| 1286 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); |
| 1287 | break; |
| 1288 | |
| 1289 | case RX_SETUP: |
| 1290 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); |
| 1291 | break; |
| 1292 | |
| 1293 | case TX_DELETE: |
| 1294 | if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) |
| 1295 | ret = MHSIZ; |
| 1296 | else |
| 1297 | ret = -EINVAL; |
| 1298 | break; |
| 1299 | |
| 1300 | case RX_DELETE: |
| 1301 | if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) |
| 1302 | ret = MHSIZ; |
| 1303 | else |
| 1304 | ret = -EINVAL; |
| 1305 | break; |
| 1306 | |
| 1307 | case TX_READ: |
| 1308 | /* reuse msg_head for the reply to TX_READ */ |
| 1309 | msg_head.opcode = TX_STATUS; |
| 1310 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); |
| 1311 | break; |
| 1312 | |
| 1313 | case RX_READ: |
| 1314 | /* reuse msg_head for the reply to RX_READ */ |
| 1315 | msg_head.opcode = RX_STATUS; |
| 1316 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); |
| 1317 | break; |
| 1318 | |
| 1319 | case TX_SEND: |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1320 | /* we need exactly one can_frame behind the msg head */ |
| 1321 | if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1322 | ret = -EINVAL; |
| 1323 | else |
| 1324 | ret = bcm_tx_send(msg, ifindex, sk); |
| 1325 | break; |
| 1326 | |
| 1327 | default: |
| 1328 | ret = -EINVAL; |
| 1329 | break; |
| 1330 | } |
| 1331 | |
| 1332 | release_sock(sk); |
| 1333 | |
| 1334 | return ret; |
| 1335 | } |
| 1336 | |
| 1337 | /* |
| 1338 | * notification handler for netdevice status changes |
| 1339 | */ |
| 1340 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, |
| 1341 | void *data) |
| 1342 | { |
| 1343 | struct net_device *dev = (struct net_device *)data; |
| 1344 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
| 1345 | struct sock *sk = &bo->sk; |
| 1346 | struct bcm_op *op; |
| 1347 | int notify_enodev = 0; |
| 1348 | |
YOSHIFUJI Hideaki | 721499e | 2008-07-19 22:34:43 -0700 | [diff] [blame] | 1349 | if (!net_eq(dev_net(dev), &init_net)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1350 | return NOTIFY_DONE; |
| 1351 | |
| 1352 | if (dev->type != ARPHRD_CAN) |
| 1353 | return NOTIFY_DONE; |
| 1354 | |
| 1355 | switch (msg) { |
| 1356 | |
| 1357 | case NETDEV_UNREGISTER: |
| 1358 | lock_sock(sk); |
| 1359 | |
| 1360 | /* remove device specific receive entries */ |
| 1361 | list_for_each_entry(op, &bo->rx_ops, list) |
| 1362 | if (op->rx_reg_dev == dev) |
| 1363 | bcm_rx_unreg(dev, op); |
| 1364 | |
| 1365 | /* remove device reference, if this is our bound device */ |
| 1366 | if (bo->bound && bo->ifindex == dev->ifindex) { |
| 1367 | bo->bound = 0; |
| 1368 | bo->ifindex = 0; |
| 1369 | notify_enodev = 1; |
| 1370 | } |
| 1371 | |
| 1372 | release_sock(sk); |
| 1373 | |
| 1374 | if (notify_enodev) { |
| 1375 | sk->sk_err = ENODEV; |
| 1376 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1377 | sk->sk_error_report(sk); |
| 1378 | } |
| 1379 | break; |
| 1380 | |
| 1381 | case NETDEV_DOWN: |
| 1382 | if (bo->bound && bo->ifindex == dev->ifindex) { |
| 1383 | sk->sk_err = ENETDOWN; |
| 1384 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1385 | sk->sk_error_report(sk); |
| 1386 | } |
| 1387 | } |
| 1388 | |
| 1389 | return NOTIFY_DONE; |
| 1390 | } |
| 1391 | |
| 1392 | /* |
| 1393 | * initial settings for all BCM sockets to be set at socket creation time |
| 1394 | */ |
| 1395 | static int bcm_init(struct sock *sk) |
| 1396 | { |
| 1397 | struct bcm_sock *bo = bcm_sk(sk); |
| 1398 | |
| 1399 | bo->bound = 0; |
| 1400 | bo->ifindex = 0; |
| 1401 | bo->dropped_usr_msgs = 0; |
| 1402 | bo->bcm_proc_read = NULL; |
| 1403 | |
| 1404 | INIT_LIST_HEAD(&bo->tx_ops); |
| 1405 | INIT_LIST_HEAD(&bo->rx_ops); |
| 1406 | |
| 1407 | /* set notifier */ |
| 1408 | bo->notifier.notifier_call = bcm_notifier; |
| 1409 | |
| 1410 | register_netdevice_notifier(&bo->notifier); |
| 1411 | |
| 1412 | return 0; |
| 1413 | } |
| 1414 | |
| 1415 | /* |
| 1416 | * standard socket functions |
| 1417 | */ |
| 1418 | static int bcm_release(struct socket *sock) |
| 1419 | { |
| 1420 | struct sock *sk = sock->sk; |
| 1421 | struct bcm_sock *bo = bcm_sk(sk); |
| 1422 | struct bcm_op *op, *next; |
| 1423 | |
| 1424 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
| 1425 | |
| 1426 | unregister_netdevice_notifier(&bo->notifier); |
| 1427 | |
| 1428 | lock_sock(sk); |
| 1429 | |
| 1430 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) |
| 1431 | bcm_remove_op(op); |
| 1432 | |
| 1433 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { |
| 1434 | /* |
| 1435 | * Don't care if we're bound or not (due to netdev problems) |
| 1436 | * can_rx_unregister() is always a save thing to do here. |
| 1437 | */ |
| 1438 | if (op->ifindex) { |
| 1439 | /* |
| 1440 | * Only remove subscriptions that had not |
| 1441 | * been removed due to NETDEV_UNREGISTER |
| 1442 | * in bcm_notifier() |
| 1443 | */ |
| 1444 | if (op->rx_reg_dev) { |
| 1445 | struct net_device *dev; |
| 1446 | |
| 1447 | dev = dev_get_by_index(&init_net, op->ifindex); |
| 1448 | if (dev) { |
| 1449 | bcm_rx_unreg(dev, op); |
| 1450 | dev_put(dev); |
| 1451 | } |
| 1452 | } |
| 1453 | } else |
| 1454 | can_rx_unregister(NULL, op->can_id, |
| 1455 | REGMASK(op->can_id), |
| 1456 | bcm_rx_handler, op); |
| 1457 | |
| 1458 | bcm_remove_op(op); |
| 1459 | } |
| 1460 | |
| 1461 | /* remove procfs entry */ |
| 1462 | if (proc_dir && bo->bcm_proc_read) |
| 1463 | remove_proc_entry(bo->procname, proc_dir); |
| 1464 | |
| 1465 | /* remove device reference */ |
| 1466 | if (bo->bound) { |
| 1467 | bo->bound = 0; |
| 1468 | bo->ifindex = 0; |
| 1469 | } |
| 1470 | |
| 1471 | release_sock(sk); |
| 1472 | sock_put(sk); |
| 1473 | |
| 1474 | return 0; |
| 1475 | } |
| 1476 | |
| 1477 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, |
| 1478 | int flags) |
| 1479 | { |
| 1480 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 1481 | struct sock *sk = sock->sk; |
| 1482 | struct bcm_sock *bo = bcm_sk(sk); |
| 1483 | |
| 1484 | if (bo->bound) |
| 1485 | return -EISCONN; |
| 1486 | |
| 1487 | /* bind a device to this socket */ |
| 1488 | if (addr->can_ifindex) { |
| 1489 | struct net_device *dev; |
| 1490 | |
| 1491 | dev = dev_get_by_index(&init_net, addr->can_ifindex); |
| 1492 | if (!dev) |
| 1493 | return -ENODEV; |
| 1494 | |
| 1495 | if (dev->type != ARPHRD_CAN) { |
| 1496 | dev_put(dev); |
| 1497 | return -ENODEV; |
| 1498 | } |
| 1499 | |
| 1500 | bo->ifindex = dev->ifindex; |
| 1501 | dev_put(dev); |
| 1502 | |
| 1503 | } else { |
| 1504 | /* no interface reference for ifindex = 0 ('any' CAN device) */ |
| 1505 | bo->ifindex = 0; |
| 1506 | } |
| 1507 | |
| 1508 | bo->bound = 1; |
| 1509 | |
| 1510 | if (proc_dir) { |
| 1511 | /* unique socket address as filename */ |
| 1512 | sprintf(bo->procname, "%p", sock); |
| 1513 | bo->bcm_proc_read = create_proc_read_entry(bo->procname, 0644, |
| 1514 | proc_dir, |
| 1515 | bcm_read_proc, sk); |
| 1516 | } |
| 1517 | |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
| 1521 | static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1522 | struct msghdr *msg, size_t size, int flags) |
| 1523 | { |
| 1524 | struct sock *sk = sock->sk; |
| 1525 | struct sk_buff *skb; |
| 1526 | int error = 0; |
| 1527 | int noblock; |
| 1528 | int err; |
| 1529 | |
| 1530 | noblock = flags & MSG_DONTWAIT; |
| 1531 | flags &= ~MSG_DONTWAIT; |
| 1532 | skb = skb_recv_datagram(sk, flags, noblock, &error); |
| 1533 | if (!skb) |
| 1534 | return error; |
| 1535 | |
| 1536 | if (skb->len < size) |
| 1537 | size = skb->len; |
| 1538 | |
| 1539 | err = memcpy_toiovec(msg->msg_iov, skb->data, size); |
| 1540 | if (err < 0) { |
| 1541 | skb_free_datagram(sk, skb); |
| 1542 | return err; |
| 1543 | } |
| 1544 | |
| 1545 | sock_recv_timestamp(msg, sk, skb); |
| 1546 | |
| 1547 | if (msg->msg_name) { |
| 1548 | msg->msg_namelen = sizeof(struct sockaddr_can); |
| 1549 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
| 1550 | } |
| 1551 | |
| 1552 | skb_free_datagram(sk, skb); |
| 1553 | |
| 1554 | return size; |
| 1555 | } |
| 1556 | |
| 1557 | static struct proto_ops bcm_ops __read_mostly = { |
| 1558 | .family = PF_CAN, |
| 1559 | .release = bcm_release, |
| 1560 | .bind = sock_no_bind, |
| 1561 | .connect = bcm_connect, |
| 1562 | .socketpair = sock_no_socketpair, |
| 1563 | .accept = sock_no_accept, |
| 1564 | .getname = sock_no_getname, |
| 1565 | .poll = datagram_poll, |
| 1566 | .ioctl = NULL, /* use can_ioctl() from af_can.c */ |
| 1567 | .listen = sock_no_listen, |
| 1568 | .shutdown = sock_no_shutdown, |
| 1569 | .setsockopt = sock_no_setsockopt, |
| 1570 | .getsockopt = sock_no_getsockopt, |
| 1571 | .sendmsg = bcm_sendmsg, |
| 1572 | .recvmsg = bcm_recvmsg, |
| 1573 | .mmap = sock_no_mmap, |
| 1574 | .sendpage = sock_no_sendpage, |
| 1575 | }; |
| 1576 | |
| 1577 | static struct proto bcm_proto __read_mostly = { |
| 1578 | .name = "CAN_BCM", |
| 1579 | .owner = THIS_MODULE, |
| 1580 | .obj_size = sizeof(struct bcm_sock), |
| 1581 | .init = bcm_init, |
| 1582 | }; |
| 1583 | |
| 1584 | static struct can_proto bcm_can_proto __read_mostly = { |
| 1585 | .type = SOCK_DGRAM, |
| 1586 | .protocol = CAN_BCM, |
| 1587 | .capability = -1, |
| 1588 | .ops = &bcm_ops, |
| 1589 | .prot = &bcm_proto, |
| 1590 | }; |
| 1591 | |
| 1592 | static int __init bcm_module_init(void) |
| 1593 | { |
| 1594 | int err; |
| 1595 | |
| 1596 | printk(banner); |
| 1597 | |
| 1598 | err = can_proto_register(&bcm_can_proto); |
| 1599 | if (err < 0) { |
| 1600 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); |
| 1601 | return err; |
| 1602 | } |
| 1603 | |
| 1604 | /* create /proc/net/can-bcm directory */ |
| 1605 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); |
| 1606 | |
| 1607 | if (proc_dir) |
| 1608 | proc_dir->owner = THIS_MODULE; |
| 1609 | |
| 1610 | return 0; |
| 1611 | } |
| 1612 | |
| 1613 | static void __exit bcm_module_exit(void) |
| 1614 | { |
| 1615 | can_proto_unregister(&bcm_can_proto); |
| 1616 | |
| 1617 | if (proc_dir) |
| 1618 | proc_net_remove(&init_net, "can-bcm"); |
| 1619 | } |
| 1620 | |
| 1621 | module_init(bcm_module_init); |
| 1622 | module_exit(bcm_module_exit); |