2.6.25-rc7

 net

 can

diff --git a/net/can/bcm.c b/net/can/bcm.c
new file mode 100644
index 0000000..bd4282d
--- /dev/null
+++ b/net/can/bcm.c
@@ -0,0 +1,1561 @@
+/*
+ * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
+ *
+ * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Volkswagen nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * Alternatively, provided that this notice is retained in full, this
+ * software may be distributed under the terms of the GNU General
+ * Public License ("GPL") version 2, in which case the provisions of the
+ * GPL apply INSTEAD OF those given above.
+ *
+ * The provided data structures and external interfaces from this code
+ * are not restricted to be used by modules with a GPL compatible license.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Send feedback to <socketcan-users@lists.berlios.de>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/proc_fs.h>
+#include <linux/uio.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/socket.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <linux/can.h>
+#include <linux/can/core.h>
+#include <linux/can/bcm.h>
+#include <net/sock.h>
+#include <net/net_namespace.h>
+
+/* use of last_frames[index].can_dlc */
+#define RX_RECV    0x40 /* received data for this element */
+#define RX_THR     0x80 /* element not been sent due to throttle feature */
+#define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */
+
+/* get best masking value for can_rx_register() for a given single can_id */
+#define REGMASK(id) ((id & CAN_RTR_FLAG) | ((id & CAN_EFF_FLAG) ? \
+         (CAN_EFF_MASK | CAN_EFF_FLAG) : CAN_SFF_MASK))
+
+#define CAN_BCM_VERSION CAN_VERSION
+static __initdata const char banner[] = KERN_INFO
+   "can: broadcast manager protocol (rev " CAN_BCM_VERSION ")\n";
+
+MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
+
+/* easy access to can_frame payload */
+static inline u64 GET_U64(const struct can_frame *cp)
+{
+   return *(u64 *)cp->data;
+}
+
+struct bcm_op {
+   struct list_head list;
+   int ifindex;
+   canid_t can_id;
+   int flags;
+   unsigned long j_ival1, j_ival2, j_lastmsg;
+   unsigned long frames_abs, frames_filtered;
+   struct timer_list timer, thrtimer;
+   struct timeval ival1, ival2;
+   ktime_t rx_stamp;
+   int rx_ifindex;
+   int count;
+   int nframes;
+   int currframe;
+   struct can_frame *frames;
+   struct can_frame *last_frames;
+   struct can_frame sframe;
+   struct can_frame last_sframe;
+   struct sock *sk;
+   struct net_device *rx_reg_dev;
+};
+
+static struct proc_dir_entry *proc_dir;
+
+struct bcm_sock {
+   struct sock sk;
+   int bound;
+   int ifindex;
+   struct notifier_block notifier;
+   struct list_head rx_ops;
+   struct list_head tx_ops;
+   unsigned long dropped_usr_msgs;
+   struct proc_dir_entry *bcm_proc_read;
+   char procname [9]; /* pointer printed in ASCII with \0 */
+};
+
+static inline struct bcm_sock *bcm_sk(const struct sock *sk)
+{
+   return (struct bcm_sock *)sk;
+}
+
+#define CFSIZ sizeof(struct can_frame)
+#define OPSIZ sizeof(struct bcm_op)
+#define MHSIZ sizeof(struct bcm_msg_head)
+
+/*
+ * rounded_tv2jif - calculate jiffies from timeval including optional up
+ * @tv: pointer to timeval
+ *
+ * Description:
+ * Unlike timeval_to_jiffies() provided in include/linux/jiffies.h, this
+ * function is intentionally more relaxed on precise timer ticks to get
+ * exact one jiffy for requested 1000us on a 1000HZ machine.
+ * This code is to be removed when upgrading to kernel hrtimer.
+ *
+ * Return:
+ *  calculated jiffies (max: ULONG_MAX)
+ */
+static unsigned long rounded_tv2jif(const struct timeval *tv)
+{
+   unsigned long sec  = tv->tv_sec;
+   unsigned long usec = tv->tv_usec;
+   unsigned long jif;
+
+   if (sec > ULONG_MAX / HZ)
+      return ULONG_MAX;
+
+   /* round up to get at least the requested time */
+   usec += 1000000 / HZ - 1;
+
+   jif  = usec / (1000000 / HZ);
+
+   if (sec * HZ > ULONG_MAX - jif)
+      return ULONG_MAX;
+
+   return jif + sec * HZ;
+}
+
+/*
+ * procfs functions
+ */
+static char *bcm_proc_getifname(int ifindex)
+{
+   struct net_device *dev;
+
+   if (!ifindex)
+      return "any";
+
+   /* no usage counting */
+   dev = __dev_get_by_index(&init_net, ifindex);
+   if (dev)
+      return dev->name;
+
+   return "???";
+}
+
+static int bcm_read_proc(char *page, char **start, off_t off,
+          int count, int *eof, void *data)
+{
+   int len = 0;
+   struct sock *sk = (struct sock *)data;
+   struct bcm_sock *bo = bcm_sk(sk);
+   struct bcm_op *op;
+
+   len += snprintf(page + len, PAGE_SIZE - len, ">>> socket %p",
+         sk->sk_socket);
+   len += snprintf(page + len, PAGE_SIZE - len, " / sk %p", sk);
+   len += snprintf(page + len, PAGE_SIZE - len, " / bo %p", bo);
+   len += snprintf(page + len, PAGE_SIZE - len, " / dropped %lu",
+         bo->dropped_usr_msgs);
+   len += snprintf(page + len, PAGE_SIZE - len, " / bound %s",
+         bcm_proc_getifname(bo->ifindex));
+   len += snprintf(page + len, PAGE_SIZE - len, " <<<\n");
+
+   list_for_each_entry(op, &bo->rx_ops, list) {
+
+      unsigned long reduction;
+
+      /* print only active entries & prevent division by zero */
+      if (!op->frames_abs)
+         continue;
+
+      len += snprintf(page + len, PAGE_SIZE - len,
+            "rx_op: %03X %-5s ",
+            op->can_id, bcm_proc_getifname(op->ifindex));
+      len += snprintf(page + len, PAGE_SIZE - len, "[%d]%c ",
+            op->nframes,
+            (op->flags & RX_CHECK_DLC)?'d':' ');
+      if (op->j_ival1)
+         len += snprintf(page + len, PAGE_SIZE - len,
+               "timeo=%ld ", op->j_ival1);
+
+      if (op->j_ival2)
+         len += snprintf(page + len, PAGE_SIZE - len,
+               "thr=%ld ", op->j_ival2);
+
+      len += snprintf(page + len, PAGE_SIZE - len,
+            "# recv %ld (%ld) => reduction: ",
+            op->frames_filtered, op->frames_abs);
+
+      reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
+
+      len += snprintf(page + len, PAGE_SIZE - len, "%s%ld%%\n",
+            (reduction == 100)?"near ":"", reduction);
+
+      if (len > PAGE_SIZE - 200) {
+         /* mark output cut off */
+         len += snprintf(page + len, PAGE_SIZE - len, "(..)\n");
+         break;
+      }
+   }
+
+   list_for_each_entry(op, &bo->tx_ops, list) {
+
+      len += snprintf(page + len, PAGE_SIZE - len,
+            "tx_op: %03X %s [%d] ",
+            op->can_id, bcm_proc_getifname(op->ifindex),
+            op->nframes);
+      if (op->j_ival1)
+         len += snprintf(page + len, PAGE_SIZE - len, "t1=%ld ",
+               op->j_ival1);
+
+      if (op->j_ival2)
+         len += snprintf(page + len, PAGE_SIZE - len, "t2=%ld ",
+               op->j_ival2);
+
+      len += snprintf(page + len, PAGE_SIZE - len, "# sent %ld\n",
+            op->frames_abs);
+
+      if (len > PAGE_SIZE - 100) {
+         /* mark output cut off */
+         len += snprintf(page + len, PAGE_SIZE - len, "(..)\n");
+         break;
+      }
+   }
+
+   len += snprintf(page + len, PAGE_SIZE - len, "\n");
+
+   *eof = 1;
+   return len;
+}
+
+/*
+ * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
+ *              of the given bcm tx op
+ */
+static void bcm_can_tx(struct bcm_op *op)
+{
+   struct sk_buff *skb;
+   struct net_device *dev;
+   struct can_frame *cf = &op->frames[op->currframe];
+
+   /* no target device? => exit */
+   if (!op->ifindex)
+      return;
+
+   dev = dev_get_by_index(&init_net, op->ifindex);
+   if (!dev) {
+      /* RFC: should this bcm_op remove itself here? */
+      return;
+   }
+
+   skb = alloc_skb(CFSIZ, gfp_any());
+   if (!skb)
+      goto out;
+
+   memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
+
+   /* send with loopback */
+   skb->dev = dev;
+   skb->sk = op->sk;
+   can_send(skb, 1);
+
+   /* update statistics */
+   op->currframe++;
+   op->frames_abs++;
+
+   /* reached last frame? */
+   if (op->currframe >= op->nframes)
+      op->currframe = 0;
+ out:
+   dev_put(dev);
+}
+
+/*
+ * bcm_send_to_user - send a BCM message to the userspace
+ *                    (consisting of bcm_msg_head + x CAN frames)
+ */
+static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
+              struct can_frame *frames, int has_timestamp)
+{
+   struct sk_buff *skb;
+   struct can_frame *firstframe;
+   struct sockaddr_can *addr;
+   struct sock *sk = op->sk;
+   int datalen = head->nframes * CFSIZ;
+   int err;
+
+   skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
+   if (!skb)
+      return;
+
+   memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
+
+   if (head->nframes) {
+      /* can_frames starting here */
+      firstframe = (struct can_frame *) skb_tail_pointer(skb);
+
+      memcpy(skb_put(skb, datalen), frames, datalen);
+
+      /*
+       * the BCM uses the can_dlc-element of the can_frame
+       * structure for internal purposes. This is only
+       * relevant for updates that are generated by the
+       * BCM, where nframes is 1
+       */
+      if (head->nframes == 1)
+         firstframe->can_dlc &= BCM_CAN_DLC_MASK;
+   }
+
+   if (has_timestamp) {
+      /* restore rx timestamp */
+      skb->tstamp = op->rx_stamp;
+   }
+
+   /*
+    *  Put the datagram to the queue so that bcm_recvmsg() can
+    *  get it from there.  We need to pass the interface index to
+    *  bcm_recvmsg().  We pass a whole struct sockaddr_can in skb->cb
+    *  containing the interface index.
+    */
+
+   BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
+   addr = (struct sockaddr_can *)skb->cb;
+   memset(addr, 0, sizeof(*addr));
+   addr->can_family  = AF_CAN;
+   addr->can_ifindex = op->rx_ifindex;
+
+   err = sock_queue_rcv_skb(sk, skb);
+   if (err < 0) {
+      struct bcm_sock *bo = bcm_sk(sk);
+
+      kfree_skb(skb);
+      /* don't care about overflows in this statistic */
+      bo->dropped_usr_msgs++;
+   }
+}
+
+/*
+ * bcm_tx_timeout_handler - performes cyclic CAN frame transmissions
+ */
+static void bcm_tx_timeout_handler(unsigned long data)
+{
+   struct bcm_op *op = (struct bcm_op *)data;
+
+   if (op->j_ival1 && (op->count > 0)) {
+
+      op->count--;
+      if (!op->count && (op->flags & TX_COUNTEVT)) {
+         struct bcm_msg_head msg_head;
+
+         /* create notification to user */
+         msg_head.opcode  = TX_EXPIRED;
+         msg_head.flags   = op->flags;
+         msg_head.count   = op->count;
+         msg_head.ival1   = op->ival1;
+         msg_head.ival2   = op->ival2;
+         msg_head.can_id  = op->can_id;
+         msg_head.nframes = 0;
+
+         bcm_send_to_user(op, &msg_head, NULL, 0);
+      }
+   }
+
+   if (op->j_ival1 && (op->count > 0)) {
+
+      /* send (next) frame */
+      bcm_can_tx(op);
+      mod_timer(&op->timer, jiffies + op->j_ival1);
+
+   } else {
+      if (op->j_ival2) {
+
+         /* send (next) frame */
+         bcm_can_tx(op);
+         mod_timer(&op->timer, jiffies + op->j_ival2);
+      }
+   }
+
+   return;
+}
+
+/*
+ * bcm_rx_changed - create a RX_CHANGED notification due to changed content
+ */
+static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
+{
+   struct bcm_msg_head head;
+
+   op->j_lastmsg = jiffies;
+
+   /* update statistics */
+   op->frames_filtered++;
+
+   /* prevent statistics overflow */
+   if (op->frames_filtered > ULONG_MAX/100)
+      op->frames_filtered = op->frames_abs = 0;
+
+   head.opcode  = RX_CHANGED;
+   head.flags   = op->flags;
+   head.count   = op->count;
+   head.ival1   = op->ival1;
+   head.ival2   = op->ival2;
+   head.can_id  = op->can_id;
+   head.nframes = 1;
+
+   bcm_send_to_user(op, &head, data, 1);
+}
+
+/*
+ * bcm_rx_update_and_send - process a detected relevant receive content change
+ *                          1. update the last received data
+ *                          2. send a notification to the user (if possible)
+ */
+static void bcm_rx_update_and_send(struct bcm_op *op,
+               struct can_frame *lastdata,
+               struct can_frame *rxdata)
+{
+   unsigned long nexttx = op->j_lastmsg + op->j_ival2;
+
+   memcpy(lastdata, rxdata, CFSIZ);
+
+   /* mark as used */
+   lastdata->can_dlc |= RX_RECV;
+
+   /* throttle bcm_rx_changed ? */
+   if ((op->thrtimer.expires) ||
+       ((op->j_ival2) && (nexttx > jiffies))) {
+      /* we are already waiting OR we have to start waiting */
+
+      /* mark as 'throttled' */
+      lastdata->can_dlc |= RX_THR;
+
+      if (!(op->thrtimer.expires)) {
+         /* start the timer only the first time */
+         mod_timer(&op->thrtimer, nexttx);
+      }
+
+   } else {
+      /* send RX_CHANGED to the user immediately */
+      bcm_rx_changed(op, rxdata);
+   }
+}
+
+/*
+ * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
+ *                       received data stored in op->last_frames[]
+ */
+static void bcm_rx_cmp_to_index(struct bcm_op *op, int index,
+            struct can_frame *rxdata)
+{
+   /*
+    * no one uses the MSBs of can_dlc for comparation,
+    * so we use it here to detect the first time of reception
+    */
+
+   if (!(op->last_frames[index].can_dlc & RX_RECV)) {
+      /* received data for the first time => send update to user */
+      bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
+      return;
+   }
+
+   /* do a real check in can_frame data section */
+
+   if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
+       (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
+      bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
+      return;
+   }
+
+   if (op->flags & RX_CHECK_DLC) {
+      /* do a real check in can_frame dlc */
+      if (rxdata->can_dlc != (op->last_frames[index].can_dlc &
+               BCM_CAN_DLC_MASK)) {
+         bcm_rx_update_and_send(op, &op->last_frames[index],
+                      rxdata);
+         return;
+      }
+   }
+}
+
+/*
+ * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption
+ */
+static void bcm_rx_starttimer(struct bcm_op *op)
+{
+   if (op->flags & RX_NO_AUTOTIMER)
+      return;
+
+   if (op->j_ival1)
+      mod_timer(&op->timer, jiffies + op->j_ival1);
+}
+
+/*
+ * bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out
+ */
+static void bcm_rx_timeout_handler(unsigned long data)
+{
+   struct bcm_op *op = (struct bcm_op *)data;
+   struct bcm_msg_head msg_head;
+
+   msg_head.opcode  = RX_TIMEOUT;
+   msg_head.flags   = op->flags;
+   msg_head.count   = op->count;
+   msg_head.ival1   = op->ival1;
+   msg_head.ival2   = op->ival2;
+   msg_head.can_id  = op->can_id;
+   msg_head.nframes = 0;
+
+   bcm_send_to_user(op, &msg_head, NULL, 0);
+
+   /* no restart of the timer is done here! */
+
+   /* if user wants to be informed, when cyclic CAN-Messages come back */
+   if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
+      /* clear received can_frames to indicate 'nothing received' */
+      memset(op->last_frames, 0, op->nframes * CFSIZ);
+   }
+}
+
+/*
+ * bcm_rx_thr_handler - the time for blocked content updates is over now:
+ *                      Check for throttled data and send it to the userspace
+ */
+static void bcm_rx_thr_handler(unsigned long data)
+{
+   struct bcm_op *op = (struct bcm_op *)data;
+   int i = 0;
+
+   /* mark disabled / consumed timer */
+   op->thrtimer.expires = 0;
+
+   if (op->nframes > 1) {
+      /* for MUX filter we start at index 1 */
+      for (i = 1; i < op->nframes; i++) {
+         if ((op->last_frames) &&
+             (op->last_frames[i].can_dlc & RX_THR)) {
+            op->last_frames[i].can_dlc &= ~RX_THR;
+            bcm_rx_changed(op, &op->last_frames[i]);
+         }
+      }
+
+   } else {
+      /* for RX_FILTER_ID and simple filter */
+      if (op->last_frames && (op->last_frames[0].can_dlc & RX_THR)) {
+         op->last_frames[0].can_dlc &= ~RX_THR;
+         bcm_rx_changed(op, &op->last_frames[0]);
+      }
+   }
+}
+
+/*
+ * bcm_rx_handler - handle a CAN frame receiption
+ */
+static void bcm_rx_handler(struct sk_buff *skb, void *data)
+{
+   struct bcm_op *op = (struct bcm_op *)data;
+   struct can_frame rxframe;
+   int i;
+
+   /* disable timeout */
+   del_timer(&op->timer);
+
+   if (skb->len == sizeof(rxframe)) {
+      memcpy(&rxframe, skb->data, sizeof(rxframe));
+      /* save rx timestamp */
+      op->rx_stamp = skb->tstamp;
+      /* save originator for recvfrom() */
+      op->rx_ifindex = skb->dev->ifindex;
+      /* update statistics */
+      op->frames_abs++;
+      kfree_skb(skb);
+
+   } else {
+      kfree_skb(skb);
+      return;
+   }
+
+   if (op->can_id != rxframe.can_id)
+      return;
+
+   if (op->flags & RX_RTR_FRAME) {
+      /* send reply for RTR-request (placed in op->frames[0]) */
+      bcm_can_tx(op);
+      return;
+   }
+
+   if (op->flags & RX_FILTER_ID) {
+      /* the easiest case */
+      bcm_rx_update_and_send(op, &op->last_frames[0], &rxframe);
+      bcm_rx_starttimer(op);
+      return;
+   }
+
+   if (op->nframes == 1) {
+      /* simple compare with index 0 */
+      bcm_rx_cmp_to_index(op, 0, &rxframe);
+      bcm_rx_starttimer(op);
+      return;
+   }
+
+   if (op->nframes > 1) {
+      /*
+       * multiplex compare
+       *
+       * find the first multiplex mask that fits.
+       * Remark: The MUX-mask is stored in index 0
+       */
+
+      for (i = 1; i < op->nframes; i++) {
+         if ((GET_U64(&op->frames[0]) & GET_U64(&rxframe)) ==
+             (GET_U64(&op->frames[0]) &
+              GET_U64(&op->frames[i]))) {
+            bcm_rx_cmp_to_index(op, i, &rxframe);
+            break;
+         }
+      }
+      bcm_rx_starttimer(op);
+   }
+}
+
+/*
+ * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements
+ */
+static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id,
+              int ifindex)
+{
+   struct bcm_op *op;
+
+   list_for_each_entry(op, ops, list) {
+      if ((op->can_id == can_id) && (op->ifindex == ifindex))
+         return op;
+   }
+
+   return NULL;
+}
+
+static void bcm_remove_op(struct bcm_op *op)
+{
+   del_timer(&op->timer);
+   del_timer(&op->thrtimer);
+
+   if ((op->frames) && (op->frames != &op->sframe))
+      kfree(op->frames);
+
+   if ((op->last_frames) && (op->last_frames != &op->last_sframe))
+      kfree(op->last_frames);
+
+   kfree(op);
+
+   return;
+}
+
+static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
+{
+   if (op->rx_reg_dev == dev) {
+      can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
+              bcm_rx_handler, op);
+
+      /* mark as removed subscription */
+      op->rx_reg_dev = NULL;
+   } else
+      printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
+             "mismatch %p %p\n", op->rx_reg_dev, dev);
+}
+
+/*
+ * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops)
+ */
+static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex)
+{
+   struct bcm_op *op, *n;
+
+   list_for_each_entry_safe(op, n, ops, list) {
+      if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
+
+         /*
+          * Don't care if we're bound or not (due to netdev
+          * problems) can_rx_unregister() is always a save
+          * thing to do here.
+          */
+         if (op->ifindex) {
+            /*
+             * Only remove subscriptions that had not
+             * been removed due to NETDEV_UNREGISTER
+             * in bcm_notifier()
+             */
+            if (op->rx_reg_dev) {
+               struct net_device *dev;
+
+               dev = dev_get_by_index(&init_net,
+                            op->ifindex);
+               if (dev) {
+                  bcm_rx_unreg(dev, op);
+                  dev_put(dev);
+               }
+            }
+         } else
+            can_rx_unregister(NULL, op->can_id,
+                    REGMASK(op->can_id),
+                    bcm_rx_handler, op);
+
+         list_del(&op->list);
+         bcm_remove_op(op);
+         return 1; /* done */
+      }
+   }
+
+   return 0; /* not found */
+}
+
+/*
+ * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops)
+ */
+static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex)
+{
+   struct bcm_op *op, *n;
+
+   list_for_each_entry_safe(op, n, ops, list) {
+      if ((op->can_id == can_id) && (op->ifindex == ifindex)) {
+         list_del(&op->list);
+         bcm_remove_op(op);
+         return 1; /* done */
+      }
+   }
+
+   return 0; /* not found */
+}
+
+/*
+ * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg)
+ */
+static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
+             int ifindex)
+{
+   struct bcm_op *op = bcm_find_op(ops, msg_head->can_id, ifindex);
+
+   if (!op)
+      return -EINVAL;
+
+   /* put current values into msg_head */
+   msg_head->flags   = op->flags;
+   msg_head->count   = op->count;
+   msg_head->ival1   = op->ival1;
+   msg_head->ival2   = op->ival2;
+   msg_head->nframes = op->nframes;
+
+   bcm_send_to_user(op, msg_head, op->frames, 0);
+
+   return MHSIZ;
+}
+
+/*
+ * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg)
+ */
+static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
+         int ifindex, struct sock *sk)
+{
+   struct bcm_sock *bo = bcm_sk(sk);
+   struct bcm_op *op;
+   int i, err;
+
+   /* we need a real device to send frames */
+   if (!ifindex)
+      return -ENODEV;
+
+   /* we need at least one can_frame */
+   if (msg_head->nframes < 1)
+      return -EINVAL;
+
+   /* check the given can_id */
+   op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex);
+
+   if (op) {
+      /* update existing BCM operation */
+
+      /*
+       * Do we need more space for the can_frames than currently
+       * allocated? -> This is a _really_ unusual use-case and
+       * therefore (complexity / locking) it is not supported.
+       */
+      if (msg_head->nframes > op->nframes)
+         return -E2BIG;
+
+      /* update can_frames content */
+      for (i = 0; i < msg_head->nframes; i++) {
+         err = memcpy_fromiovec((u8 *)&op->frames[i],
+                      msg->msg_iov, CFSIZ);
+         if (err < 0)
+            return err;
+
+         if (msg_head->flags & TX_CP_CAN_ID) {
+            /* copy can_id into frame */
+            op->frames[i].can_id = msg_head->can_id;
+         }
+      }
+
+   } else {
+      /* insert new BCM operation for the given can_id */
+
+      op = kzalloc(OPSIZ, GFP_KERNEL);
+      if (!op)
+         return -ENOMEM;
+
+      op->can_id    = msg_head->can_id;
+
+      /* create array for can_frames and copy the data */
+      if (msg_head->nframes > 1) {
+         op->frames = kmalloc(msg_head->nframes * CFSIZ,
+                    GFP_KERNEL);
+         if (!op->frames) {
+            kfree(op);
+            return -ENOMEM;
+         }
+      } else
+         op->frames = &op->sframe;
+
+      for (i = 0; i < msg_head->nframes; i++) {
+         err = memcpy_fromiovec((u8 *)&op->frames[i],
+                      msg->msg_iov, CFSIZ);
+         if (err < 0) {
+            if (op->frames != &op->sframe)
+               kfree(op->frames);
+            kfree(op);
+            return err;
+         }
+
+         if (msg_head->flags & TX_CP_CAN_ID) {
+            /* copy can_id into frame */
+            op->frames[i].can_id = msg_head->can_id;
+         }
+      }
+
+      /* tx_ops never compare with previous received messages */
+      op->last_frames = NULL;
+
+      /* bcm_can_tx / bcm_tx_timeout_handler needs this */
+      op->sk = sk;
+      op->ifindex = ifindex;
+
+      /* initialize uninitialized (kzalloc) structure */
+      setup_timer(&op->timer, bcm_tx_timeout_handler,
+             (unsigned long)op);
+
+      /* currently unused in tx_ops */
+      init_timer(&op->thrtimer);
+
+      /* add this bcm_op to the list of the tx_ops */
+      list_add(&op->list, &bo->tx_ops);
+
+   } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */
+
+   if (op->nframes != msg_head->nframes) {
+      op->nframes   = msg_head->nframes;
+      /* start multiple frame transmission with index 0 */
+      op->currframe = 0;
+   }
+
+   /* check flags */
+
+   op->flags = msg_head->flags;
+
+   if (op->flags & TX_RESET_MULTI_IDX) {
+      /* start multiple frame transmission with index 0 */
+      op->currframe = 0;
+   }
+
+   if (op->flags & SETTIMER) {
+      /* set timer values */
+      op->count = msg_head->count;
+      op->ival1 = msg_head->ival1;
+      op->ival2 = msg_head->ival2;
+      op->j_ival1 = rounded_tv2jif(&msg_head->ival1);
+      op->j_ival2 = rounded_tv2jif(&msg_head->ival2);
+
+      /* disable an active timer due to zero values? */
+      if (!op->j_ival1 && !op->j_ival2)
+         del_timer(&op->timer);
+   }
+
+   if ((op->flags & STARTTIMER) &&
+       ((op->j_ival1 && op->count) || op->j_ival2)) {
+
+      /* spec: send can_frame when starting timer */
+      op->flags |= TX_ANNOUNCE;
+
+      if (op->j_ival1 && (op->count > 0)) {
+         /* op->count-- is done in bcm_tx_timeout_handler */
+         mod_timer(&op->timer, jiffies + op->j_ival1);
+      } else
+         mod_timer(&op->timer, jiffies + op->j_ival2);
+   }
+
+   if (op->flags & TX_ANNOUNCE)
+      bcm_can_tx(op);
+
+   return msg_head->nframes * CFSIZ + MHSIZ;
+}
+
+/*
+ * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
+ */
+static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
+         int ifindex, struct sock *sk)
+{
+   struct bcm_sock *bo = bcm_sk(sk);
+   struct bcm_op *op;
+   int do_rx_register;
+   int err = 0;
+
+   if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
+      /* be robust against wrong usage ... */
+      msg_head->flags |= RX_FILTER_ID;
+      /* ignore trailing garbage */
+      msg_head->nframes = 0;
+   }
+
+   if ((msg_head->flags & RX_RTR_FRAME) &&
+       ((msg_head->nframes != 1) ||
+        (!(msg_head->can_id & CAN_RTR_FLAG))))
+      return -EINVAL;
+
+   /* check the given can_id */
+   op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex);
+   if (op) {
+      /* update existing BCM operation */
+
+      /*
+       * Do we need more space for the can_frames than currently
+       * allocated? -> This is a _really_ unusual use-case and
+       * therefore (complexity / locking) it is not supported.
+       */
+      if (msg_head->nframes > op->nframes)
+         return -E2BIG;
+
+      if (msg_head->nframes) {
+         /* update can_frames content */
+         err = memcpy_fromiovec((u8 *)op->frames,
+                      msg->msg_iov,
+                      msg_head->nframes * CFSIZ);
+         if (err < 0)
+            return err;
+
+         /* clear last_frames to indicate 'nothing received' */
+         memset(op->last_frames, 0, msg_head->nframes * CFSIZ);
+      }
+
+      op->nframes = msg_head->nframes;
+
+      /* Only an update -> do not call can_rx_register() */
+      do_rx_register = 0;
+
+   } else {
+      /* insert new BCM operation for the given can_id */
+      op = kzalloc(OPSIZ, GFP_KERNEL);
+      if (!op)
+         return -ENOMEM;
+
+      op->can_id    = msg_head->can_id;
+      op->nframes   = msg_head->nframes;
+
+      if (msg_head->nframes > 1) {
+         /* create array for can_frames and copy the data */
+         op->frames = kmalloc(msg_head->nframes * CFSIZ,
+                    GFP_KERNEL);
+         if (!op->frames) {
+            kfree(op);
+            return -ENOMEM;
+         }
+
+         /* create and init array for received can_frames */
+         op->last_frames = kzalloc(msg_head->nframes * CFSIZ,
+                    GFP_KERNEL);
+         if (!op->last_frames) {
+            kfree(op->frames);
+            kfree(op);
+            return -ENOMEM;
+         }
+
+      } else {
+         op->frames = &op->sframe;
+         op->last_frames = &op->last_sframe;
+      }
+
+      if (msg_head->nframes) {
+         err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov,
+                      msg_head->nframes * CFSIZ);
+         if (err < 0) {
+            if (op->frames != &op->sframe)
+               kfree(op->frames);
+            if (op->last_frames != &op->last_sframe)
+               kfree(op->last_frames);
+            kfree(op);
+            return err;
+         }
+      }
+
+      /* bcm_can_tx / bcm_tx_timeout_handler needs this */
+      op->sk = sk;
+      op->ifindex = ifindex;
+
+      /* initialize uninitialized (kzalloc) structure */
+      setup_timer(&op->timer, bcm_rx_timeout_handler,
+             (unsigned long)op);
+
+      /* init throttle timer for RX_CHANGED */
+      setup_timer(&op->thrtimer, bcm_rx_thr_handler,
+             (unsigned long)op);
+
+      /* mark disabled timer */
+      op->thrtimer.expires = 0;
+
+      /* add this bcm_op to the list of the rx_ops */
+      list_add(&op->list, &bo->rx_ops);
+
+      /* call can_rx_register() */
+      do_rx_register = 1;
+
+   } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */
+
+   /* check flags */
+   op->flags = msg_head->flags;
+
+   if (op->flags & RX_RTR_FRAME) {
+
+      /* no timers in RTR-mode */
+      del_timer(&op->thrtimer);
+      del_timer(&op->timer);
+
+      /*
+       * funny feature in RX(!)_SETUP only for RTR-mode:
+       * copy can_id into frame BUT without RTR-flag to
+       * prevent a full-load-loopback-test ... ;-]
+       */
+      if ((op->flags & TX_CP_CAN_ID) ||
+          (op->frames[0].can_id == op->can_id))
+         op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
+
+   } else {
+      if (op->flags & SETTIMER) {
+
+         /* set timer value */
+         op->ival1 = msg_head->ival1;
+         op->ival2 = msg_head->ival2;
+         op->j_ival1 = rounded_tv2jif(&msg_head->ival1);
+         op->j_ival2 = rounded_tv2jif(&msg_head->ival2);
+
+         /* disable an active timer due to zero value? */
+         if (!op->j_ival1)
+            del_timer(&op->timer);
+
+         /* free currently blocked msgs ? */
+         if (op->thrtimer.expires) {
+            /* send blocked msgs hereafter */
+            mod_timer(&op->thrtimer, jiffies + 2);
+         }
+
+         /*
+          * if (op->j_ival2) is zero, no (new) throttling
+          * will happen. For details see functions
+          * bcm_rx_update_and_send() and bcm_rx_thr_handler()
+          */
+      }
+
+      if ((op->flags & STARTTIMER) && op->j_ival1)
+         mod_timer(&op->timer, jiffies + op->j_ival1);
+   }
+
+   /* now we can register for can_ids, if we added a new bcm_op */
+   if (do_rx_register) {
+      if (ifindex) {
+         struct net_device *dev;
+
+         dev = dev_get_by_index(&init_net, ifindex);
+         if (dev) {
+            err = can_rx_register(dev, op->can_id,
+                        REGMASK(op->can_id),
+                        bcm_rx_handler, op,
+                        "bcm");
+
+            op->rx_reg_dev = dev;
+            dev_put(dev);
+         }
+
+      } else
+         err = can_rx_register(NULL, op->can_id,
+                     REGMASK(op->can_id),
+                     bcm_rx_handler, op, "bcm");
+      if (err) {
+         /* this bcm rx op is broken -> remove it */
+         list_del(&op->list);
+         bcm_remove_op(op);
+         return err;
+      }
+   }
+
+   return msg_head->nframes * CFSIZ + MHSIZ;
+}
+
+/*
+ * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg)
+ */
+static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
+{
+   struct sk_buff *skb;
+   struct net_device *dev;
+   int err;
+
+   /* we need a real device to send frames */
+   if (!ifindex)
+      return -ENODEV;
+
+   skb = alloc_skb(CFSIZ, GFP_KERNEL);
+
+   if (!skb)
+      return -ENOMEM;
+
+   err = memcpy_fromiovec(skb_put(skb, CFSIZ), msg->msg_iov, CFSIZ);
+   if (err < 0) {
+      kfree_skb(skb);
+      return err;
+   }
+
+   dev = dev_get_by_index(&init_net, ifindex);
+   if (!dev) {
+      kfree_skb(skb);
+      return -ENODEV;
+   }
+
+   skb->dev = dev;
+   skb->sk  = sk;
+   can_send(skb, 1); /* send with loopback */
+   dev_put(dev);
+
+   return CFSIZ + MHSIZ;
+}
+
+/*
+ * bcm_sendmsg - process BCM commands (opcodes) from the userspace
+ */
+static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock,
+             struct msghdr *msg, size_t size)
+{
+   struct sock *sk = sock->sk;
+   struct bcm_sock *bo = bcm_sk(sk);
+   int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
+   struct bcm_msg_head msg_head;
+   int ret; /* read bytes or error codes as return value */
+
+   if (!bo->bound)
+      return -ENOTCONN;
+
+   /* check for alternative ifindex for this bcm_op */
+
+   if (!ifindex && msg->msg_name) {
+      /* no bound device as default => check msg_name */
+      struct sockaddr_can *addr =
+         (struct sockaddr_can *)msg->msg_name;
+
+      if (addr->can_family != AF_CAN)
+         return -EINVAL;
+
+      /* ifindex from sendto() */
+      ifindex = addr->can_ifindex;
+
+      if (ifindex) {
+         struct net_device *dev;
+
+         dev = dev_get_by_index(&init_net, ifindex);
+         if (!dev)
+            return -ENODEV;
+
+         if (dev->type != ARPHRD_CAN) {
+            dev_put(dev);
+            return -ENODEV;
+         }
+
+         dev_put(dev);
+      }
+   }
+
+   /* read message head information */
+
+   ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ);
+   if (ret < 0)
+      return ret;
+
+   lock_sock(sk);
+
+   switch (msg_head.opcode) {
+
+   case TX_SETUP:
+      ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
+      break;
+
+   case RX_SETUP:
+      ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
+      break;
+
+   case TX_DELETE:
+      if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex))
+         ret = MHSIZ;
+      else
+         ret = -EINVAL;
+      break;
+
+   case RX_DELETE:
+      if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex))
+         ret = MHSIZ;
+      else
+         ret = -EINVAL;
+      break;
+
+   case TX_READ:
+      /* reuse msg_head for the reply to TX_READ */
+      msg_head.opcode  = TX_STATUS;
+      ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
+      break;
+
+   case RX_READ:
+      /* reuse msg_head for the reply to RX_READ */
+      msg_head.opcode  = RX_STATUS;
+      ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
+      break;
+
+   case TX_SEND:
+      /* we need at least one can_frame */
+      if (msg_head.nframes < 1)
+         ret = -EINVAL;
+      else
+         ret = bcm_tx_send(msg, ifindex, sk);
+      break;
+
+   default:
+      ret = -EINVAL;
+      break;
+   }
+
+   release_sock(sk);
+
+   return ret;
+}
+
+/*
+ * notification handler for netdevice status changes
+ */
+static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
+         void *data)
+{
+   struct net_device *dev = (struct net_device *)data;
+   struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
+   struct sock *sk = &bo->sk;
+   struct bcm_op *op;
+   int notify_enodev = 0;
+
+   if (dev->nd_net != &init_net)
+      return NOTIFY_DONE;
+
+   if (dev->type != ARPHRD_CAN)
+      return NOTIFY_DONE;
+
+   switch (msg) {
+
+   case NETDEV_UNREGISTER:
+      lock_sock(sk);
+
+      /* remove device specific receive entries */
+      list_for_each_entry(op, &bo->rx_ops, list)
+         if (op->rx_reg_dev == dev)
+            bcm_rx_unreg(dev, op);
+
+      /* remove device reference, if this is our bound device */
+      if (bo->bound && bo->ifindex == dev->ifindex) {
+         bo->bound   = 0;
+         bo->ifindex = 0;
+         notify_enodev = 1;
+      }
+
+      release_sock(sk);
+
+      if (notify_enodev) {
+         sk->sk_err = ENODEV;
+         if (!sock_flag(sk, SOCK_DEAD))
+            sk->sk_error_report(sk);
+      }
+      break;
+
+   case NETDEV_DOWN:
+      if (bo->bound && bo->ifindex == dev->ifindex) {
+         sk->sk_err = ENETDOWN;
+         if (!sock_flag(sk, SOCK_DEAD))
+            sk->sk_error_report(sk);
+      }
+   }
+
+   return NOTIFY_DONE;
+}
+
+/*
+ * initial settings for all BCM sockets to be set at socket creation time
+ */
+static int bcm_init(struct sock *sk)
+{
+   struct bcm_sock *bo = bcm_sk(sk);
+
+   bo->bound            = 0;
+   bo->ifindex          = 0;
+   bo->dropped_usr_msgs = 0;
+   bo->bcm_proc_read    = NULL;
+
+   INIT_LIST_HEAD(&bo->tx_ops);
+   INIT_LIST_HEAD(&bo->rx_ops);
+
+   /* set notifier */
+   bo->notifier.notifier_call = bcm_notifier;
+
+   register_netdevice_notifier(&bo->notifier);
+
+   return 0;
+}
+
+/*
+ * standard socket functions
+ */
+static int bcm_release(struct socket *sock)
+{
+   struct sock *sk = sock->sk;
+   struct bcm_sock *bo = bcm_sk(sk);
+   struct bcm_op *op, *next;
+
+   /* remove bcm_ops, timer, rx_unregister(), etc. */
+
+   unregister_netdevice_notifier(&bo->notifier);
+
+   lock_sock(sk);
+
+   list_for_each_entry_safe(op, next, &bo->tx_ops, list)
+      bcm_remove_op(op);
+
+   list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
+      /*
+       * Don't care if we're bound or not (due to netdev problems)
+       * can_rx_unregister() is always a save thing to do here.
+       */
+      if (op->ifindex) {
+         /*
+          * Only remove subscriptions that had not
+          * been removed due to NETDEV_UNREGISTER
+          * in bcm_notifier()
+          */
+         if (op->rx_reg_dev) {
+            struct net_device *dev;
+
+            dev = dev_get_by_index(&init_net, op->ifindex);
+            if (dev) {
+               bcm_rx_unreg(dev, op);
+               dev_put(dev);
+            }
+         }
+      } else
+         can_rx_unregister(NULL, op->can_id,
+                 REGMASK(op->can_id),
+                 bcm_rx_handler, op);
+
+      bcm_remove_op(op);
+   }
+
+   /* remove procfs entry */
+   if (proc_dir && bo->bcm_proc_read)
+      remove_proc_entry(bo->procname, proc_dir);
+
+   /* remove device reference */
+   if (bo->bound) {
+      bo->bound   = 0;
+      bo->ifindex = 0;
+   }
+
+   release_sock(sk);
+   sock_put(sk);
+
+   return 0;
+}
+
+static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
+             int flags)
+{
+   struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
+   struct sock *sk = sock->sk;
+   struct bcm_sock *bo = bcm_sk(sk);
+
+   if (bo->bound)
+      return -EISCONN;
+
+   /* bind a device to this socket */
+   if (addr->can_ifindex) {
+      struct net_device *dev;
+
+      dev = dev_get_by_index(&init_net, addr->can_ifindex);
+      if (!dev)
+         return -ENODEV;
+
+      if (dev->type != ARPHRD_CAN) {
+         dev_put(dev);
+         return -ENODEV;
+      }
+
+      bo->ifindex = dev->ifindex;
+      dev_put(dev);
+
+   } else {
+      /* no interface reference for ifindex = 0 ('any' CAN device) */
+      bo->ifindex = 0;
+   }
+
+   bo->bound = 1;
+
+   if (proc_dir) {
+      /* unique socket address as filename */
+      sprintf(bo->procname, "%p", sock);
+      bo->bcm_proc_read = create_proc_read_entry(bo->procname, 0644,
+                        proc_dir,
+                        bcm_read_proc, sk);
+   }
+
+   return 0;
+}
+
+static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
+             struct msghdr *msg, size_t size, int flags)
+{
+   struct sock *sk = sock->sk;
+   struct sk_buff *skb;
+   int error = 0;
+   int noblock;
+   int err;
+
+   noblock =  flags & MSG_DONTWAIT;
+   flags   &= ~MSG_DONTWAIT;
+   skb = skb_recv_datagram(sk, flags, noblock, &error);
+   if (!skb)
+      return error;
+
+   if (skb->len < size)
+      size = skb->len;
+
+   err = memcpy_toiovec(msg->msg_iov, skb->data, size);
+   if (err < 0) {
+      skb_free_datagram(sk, skb);
+      return err;
+   }
+
+   sock_recv_timestamp(msg, sk, skb);
+
+   if (msg->msg_name) {
+      msg->msg_namelen = sizeof(struct sockaddr_can);
+      memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
+   }
+
+   skb_free_datagram(sk, skb);
+
+   return size;
+}
+
+static struct proto_ops bcm_ops __read_mostly = {
+   .family        = PF_CAN,
+   .release       = bcm_release,
+   .bind          = sock_no_bind,
+   .connect       = bcm_connect,
+   .socketpair    = sock_no_socketpair,
+   .accept        = sock_no_accept,
+   .getname       = sock_no_getname,
+   .poll          = datagram_poll,
+   .ioctl         = NULL,      /* use can_ioctl() from af_can.c */
+   .listen        = sock_no_listen,
+   .shutdown      = sock_no_shutdown,
+   .setsockopt    = sock_no_setsockopt,
+   .getsockopt    = sock_no_getsockopt,
+   .sendmsg       = bcm_sendmsg,
+   .recvmsg       = bcm_recvmsg,
+   .mmap          = sock_no_mmap,
+   .sendpage      = sock_no_sendpage,
+};
+
+static struct proto bcm_proto __read_mostly = {
+   .name       = "CAN_BCM",
+   .owner      = THIS_MODULE,
+   .obj_size   = sizeof(struct bcm_sock),
+   .init       = bcm_init,
+};
+
+static struct can_proto bcm_can_proto __read_mostly = {
+   .type       = SOCK_DGRAM,
+   .protocol   = CAN_BCM,
+   .capability = -1,
+   .ops        = &bcm_ops,
+   .prot       = &bcm_proto,
+};
+
+static int __init bcm_module_init(void)
+{
+   int err;
+
+   printk(banner);
+
+   err = can_proto_register(&bcm_can_proto);
+   if (err < 0) {
+      printk(KERN_ERR "can: registration of bcm protocol failed\n");
+      return err;
+   }
+
+   /* create /proc/net/can-bcm directory */
+   proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
+
+   if (proc_dir)
+      proc_dir->owner = THIS_MODULE;
+
+   return 0;
+}
+
+static void __exit bcm_module_exit(void)
+{
+   can_proto_unregister(&bcm_can_proto);
+
+   if (proc_dir)
+      proc_net_remove(&init_net, "can-bcm");
+}
+
+module_init(bcm_module_init);
+module_exit(bcm_module_exit);