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6755aebaaf
bcm_proc_getifname() is called with RTNL and dev_base_lock not held. It calls __dev_get_by_index() without locks, and this is illegal (might crash) Close the race by holding dev_base_lock and copying dev->name in the protected section. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1616 lines
39 KiB
C
1616 lines
39 KiB
C
/*
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* bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
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*
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* Send feedback to <socketcan-users@lists.berlios.de>
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/hrtimer.h>
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#include <linux/list.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/uio.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/socket.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/can.h>
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#include <linux/can/core.h>
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#include <linux/can/bcm.h>
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#include <net/sock.h>
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#include <net/net_namespace.h>
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/* use of last_frames[index].can_dlc */
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#define RX_RECV 0x40 /* received data for this element */
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#define RX_THR 0x80 /* element not been sent due to throttle feature */
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#define BCM_CAN_DLC_MASK 0x0F /* clean private flags in can_dlc by masking */
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/* get best masking value for can_rx_register() for a given single can_id */
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#define REGMASK(id) ((id & CAN_EFF_FLAG) ? \
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(CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
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(CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
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#define CAN_BCM_VERSION CAN_VERSION
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static __initdata const char banner[] = KERN_INFO
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"can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n";
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MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
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MODULE_ALIAS("can-proto-2");
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/* easy access to can_frame payload */
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static inline u64 GET_U64(const struct can_frame *cp)
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{
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return *(u64 *)cp->data;
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}
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struct bcm_op {
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struct list_head list;
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int ifindex;
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canid_t can_id;
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int flags;
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unsigned long frames_abs, frames_filtered;
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struct timeval ival1, ival2;
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struct hrtimer timer, thrtimer;
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struct tasklet_struct tsklet, thrtsklet;
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ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
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int rx_ifindex;
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int count;
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int nframes;
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int currframe;
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struct can_frame *frames;
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struct can_frame *last_frames;
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struct can_frame sframe;
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struct can_frame last_sframe;
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struct sock *sk;
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struct net_device *rx_reg_dev;
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};
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static struct proc_dir_entry *proc_dir;
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struct bcm_sock {
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struct sock sk;
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int bound;
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int ifindex;
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struct notifier_block notifier;
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struct list_head rx_ops;
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struct list_head tx_ops;
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unsigned long dropped_usr_msgs;
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struct proc_dir_entry *bcm_proc_read;
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char procname [9]; /* pointer printed in ASCII with \0 */
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};
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static inline struct bcm_sock *bcm_sk(const struct sock *sk)
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{
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return (struct bcm_sock *)sk;
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}
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#define CFSIZ sizeof(struct can_frame)
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#define OPSIZ sizeof(struct bcm_op)
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#define MHSIZ sizeof(struct bcm_msg_head)
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/*
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* procfs functions
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*/
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static char *bcm_proc_getifname(char *result, int ifindex)
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{
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struct net_device *dev;
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if (!ifindex)
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return "any";
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read_lock(&dev_base_lock);
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dev = __dev_get_by_index(&init_net, ifindex);
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if (dev)
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strcpy(result, dev->name);
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else
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strcpy(result, "???");
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read_unlock(&dev_base_lock);
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return result;
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}
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static int bcm_proc_show(struct seq_file *m, void *v)
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{
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char ifname[IFNAMSIZ];
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struct sock *sk = (struct sock *)m->private;
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struct bcm_sock *bo = bcm_sk(sk);
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struct bcm_op *op;
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seq_printf(m, ">>> socket %p", sk->sk_socket);
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seq_printf(m, " / sk %p", sk);
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seq_printf(m, " / bo %p", bo);
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seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
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seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
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seq_printf(m, " <<<\n");
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list_for_each_entry(op, &bo->rx_ops, list) {
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unsigned long reduction;
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/* print only active entries & prevent division by zero */
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if (!op->frames_abs)
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continue;
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seq_printf(m, "rx_op: %03X %-5s ",
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op->can_id, bcm_proc_getifname(ifname, op->ifindex));
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seq_printf(m, "[%d]%c ", op->nframes,
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(op->flags & RX_CHECK_DLC)?'d':' ');
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if (op->kt_ival1.tv64)
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seq_printf(m, "timeo=%lld ",
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(long long)
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ktime_to_us(op->kt_ival1));
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if (op->kt_ival2.tv64)
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seq_printf(m, "thr=%lld ",
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(long long)
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ktime_to_us(op->kt_ival2));
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seq_printf(m, "# recv %ld (%ld) => reduction: ",
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op->frames_filtered, op->frames_abs);
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reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
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seq_printf(m, "%s%ld%%\n",
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(reduction == 100)?"near ":"", reduction);
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}
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list_for_each_entry(op, &bo->tx_ops, list) {
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seq_printf(m, "tx_op: %03X %s [%d] ",
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op->can_id,
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bcm_proc_getifname(ifname, op->ifindex),
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op->nframes);
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if (op->kt_ival1.tv64)
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seq_printf(m, "t1=%lld ",
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(long long) ktime_to_us(op->kt_ival1));
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if (op->kt_ival2.tv64)
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seq_printf(m, "t2=%lld ",
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(long long) ktime_to_us(op->kt_ival2));
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seq_printf(m, "# sent %ld\n", op->frames_abs);
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}
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seq_putc(m, '\n');
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return 0;
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}
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static int bcm_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bcm_proc_show, PDE(inode)->data);
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}
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static const struct file_operations bcm_proc_fops = {
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.owner = THIS_MODULE,
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.open = bcm_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/*
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* bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
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* of the given bcm tx op
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*/
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static void bcm_can_tx(struct bcm_op *op)
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{
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struct sk_buff *skb;
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struct net_device *dev;
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struct can_frame *cf = &op->frames[op->currframe];
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/* no target device? => exit */
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if (!op->ifindex)
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return;
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dev = dev_get_by_index(&init_net, op->ifindex);
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if (!dev) {
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/* RFC: should this bcm_op remove itself here? */
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return;
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}
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skb = alloc_skb(CFSIZ, gfp_any());
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if (!skb)
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goto out;
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memcpy(skb_put(skb, CFSIZ), cf, CFSIZ);
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/* send with loopback */
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skb->dev = dev;
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skb->sk = op->sk;
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can_send(skb, 1);
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/* update statistics */
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op->currframe++;
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op->frames_abs++;
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/* reached last frame? */
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if (op->currframe >= op->nframes)
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op->currframe = 0;
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out:
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dev_put(dev);
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}
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/*
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* bcm_send_to_user - send a BCM message to the userspace
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* (consisting of bcm_msg_head + x CAN frames)
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*/
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static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
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struct can_frame *frames, int has_timestamp)
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{
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struct sk_buff *skb;
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struct can_frame *firstframe;
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struct sockaddr_can *addr;
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struct sock *sk = op->sk;
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int datalen = head->nframes * CFSIZ;
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int err;
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skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
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if (!skb)
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return;
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memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
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if (head->nframes) {
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/* can_frames starting here */
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firstframe = (struct can_frame *)skb_tail_pointer(skb);
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memcpy(skb_put(skb, datalen), frames, datalen);
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/*
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* the BCM uses the can_dlc-element of the can_frame
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* structure for internal purposes. This is only
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* relevant for updates that are generated by the
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* BCM, where nframes is 1
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*/
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if (head->nframes == 1)
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firstframe->can_dlc &= BCM_CAN_DLC_MASK;
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}
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if (has_timestamp) {
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/* restore rx timestamp */
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skb->tstamp = op->rx_stamp;
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}
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/*
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* Put the datagram to the queue so that bcm_recvmsg() can
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* get it from there. We need to pass the interface index to
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* bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
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* containing the interface index.
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*/
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BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
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addr = (struct sockaddr_can *)skb->cb;
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memset(addr, 0, sizeof(*addr));
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addr->can_family = AF_CAN;
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addr->can_ifindex = op->rx_ifindex;
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err = sock_queue_rcv_skb(sk, skb);
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if (err < 0) {
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struct bcm_sock *bo = bcm_sk(sk);
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kfree_skb(skb);
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/* don't care about overflows in this statistic */
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bo->dropped_usr_msgs++;
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}
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}
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static void bcm_tx_timeout_tsklet(unsigned long data)
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{
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struct bcm_op *op = (struct bcm_op *)data;
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struct bcm_msg_head msg_head;
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if (op->kt_ival1.tv64 && (op->count > 0)) {
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op->count--;
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if (!op->count && (op->flags & TX_COUNTEVT)) {
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/* create notification to user */
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msg_head.opcode = TX_EXPIRED;
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msg_head.flags = op->flags;
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msg_head.count = op->count;
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msg_head.ival1 = op->ival1;
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msg_head.ival2 = op->ival2;
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msg_head.can_id = op->can_id;
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msg_head.nframes = 0;
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bcm_send_to_user(op, &msg_head, NULL, 0);
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}
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}
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if (op->kt_ival1.tv64 && (op->count > 0)) {
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/* send (next) frame */
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bcm_can_tx(op);
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hrtimer_start(&op->timer,
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ktime_add(ktime_get(), op->kt_ival1),
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HRTIMER_MODE_ABS);
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} else {
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if (op->kt_ival2.tv64) {
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/* send (next) frame */
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bcm_can_tx(op);
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hrtimer_start(&op->timer,
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ktime_add(ktime_get(), op->kt_ival2),
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HRTIMER_MODE_ABS);
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}
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}
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}
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/*
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* bcm_tx_timeout_handler - performes cyclic CAN frame transmissions
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*/
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static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
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{
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struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
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tasklet_schedule(&op->tsklet);
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return HRTIMER_NORESTART;
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}
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/*
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* bcm_rx_changed - create a RX_CHANGED notification due to changed content
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*/
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static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data)
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{
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struct bcm_msg_head head;
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/* update statistics */
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op->frames_filtered++;
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/* prevent statistics overflow */
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if (op->frames_filtered > ULONG_MAX/100)
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op->frames_filtered = op->frames_abs = 0;
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/* this element is not throttled anymore */
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data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV);
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head.opcode = RX_CHANGED;
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head.flags = op->flags;
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head.count = op->count;
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head.ival1 = op->ival1;
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head.ival2 = op->ival2;
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head.can_id = op->can_id;
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head.nframes = 1;
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bcm_send_to_user(op, &head, data, 1);
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}
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/*
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* bcm_rx_update_and_send - process a detected relevant receive content change
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* 1. update the last received data
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* 2. send a notification to the user (if possible)
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*/
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static void bcm_rx_update_and_send(struct bcm_op *op,
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struct can_frame *lastdata,
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const struct can_frame *rxdata)
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{
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memcpy(lastdata, rxdata, CFSIZ);
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|
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/* mark as used and throttled by default */
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lastdata->can_dlc |= (RX_RECV|RX_THR);
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|
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/* throtteling mode inactive ? */
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if (!op->kt_ival2.tv64) {
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/* send RX_CHANGED to the user immediately */
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bcm_rx_changed(op, lastdata);
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return;
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}
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|
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/* with active throttling timer we are just done here */
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if (hrtimer_active(&op->thrtimer))
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return;
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|
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/* first receiption with enabled throttling mode */
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if (!op->kt_lastmsg.tv64)
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goto rx_changed_settime;
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|
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/* got a second frame inside a potential throttle period? */
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if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
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ktime_to_us(op->kt_ival2)) {
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/* do not send the saved data - only start throttle timer */
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hrtimer_start(&op->thrtimer,
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ktime_add(op->kt_lastmsg, op->kt_ival2),
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HRTIMER_MODE_ABS);
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return;
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}
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|
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/* the gap was that big, that throttling was not needed here */
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rx_changed_settime:
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bcm_rx_changed(op, lastdata);
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op->kt_lastmsg = ktime_get();
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}
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|
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/*
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* bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
|
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* received data stored in op->last_frames[]
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*/
|
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static void bcm_rx_cmp_to_index(struct bcm_op *op, int index,
|
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const struct can_frame *rxdata)
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{
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/*
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* no one uses the MSBs of can_dlc for comparation,
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* so we use it here to detect the first time of reception
|
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*/
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|
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if (!(op->last_frames[index].can_dlc & RX_RECV)) {
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/* received data for the first time => send update to user */
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bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
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return;
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}
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|
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/* do a real check in can_frame data section */
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|
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if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) !=
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(GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) {
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bcm_rx_update_and_send(op, &op->last_frames[index], rxdata);
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return;
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}
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|
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if (op->flags & RX_CHECK_DLC) {
|
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/* do a real check in can_frame dlc */
|
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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->kt_ival1.tv64)
|
|
hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
|
|
}
|
|
|
|
static void bcm_rx_timeout_tsklet(unsigned long data)
|
|
{
|
|
struct bcm_op *op = (struct bcm_op *)data;
|
|
struct bcm_msg_head msg_head;
|
|
|
|
/* create notification to user */
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* bcm_rx_timeout_handler - when the (cyclic) CAN frame receiption timed out
|
|
*/
|
|
static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
|
|
{
|
|
struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
|
|
|
|
/* schedule before NET_RX_SOFTIRQ */
|
|
tasklet_hi_schedule(&op->tsklet);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/*
|
|
* bcm_rx_do_flush - helper for bcm_rx_thr_flush
|
|
*/
|
|
static inline int bcm_rx_do_flush(struct bcm_op *op, int update, int index)
|
|
{
|
|
if ((op->last_frames) && (op->last_frames[index].can_dlc & RX_THR)) {
|
|
if (update)
|
|
bcm_rx_changed(op, &op->last_frames[index]);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* bcm_rx_thr_flush - Check for throttled data and send it to the userspace
|
|
*
|
|
* update == 0 : just check if throttled data is available (any irq context)
|
|
* update == 1 : check and send throttled data to userspace (soft_irq context)
|
|
*/
|
|
static int bcm_rx_thr_flush(struct bcm_op *op, int update)
|
|
{
|
|
int updated = 0;
|
|
|
|
if (op->nframes > 1) {
|
|
int i;
|
|
|
|
/* for MUX filter we start at index 1 */
|
|
for (i = 1; i < op->nframes; i++)
|
|
updated += bcm_rx_do_flush(op, update, i);
|
|
|
|
} else {
|
|
/* for RX_FILTER_ID and simple filter */
|
|
updated += bcm_rx_do_flush(op, update, 0);
|
|
}
|
|
|
|
return updated;
|
|
}
|
|
|
|
static void bcm_rx_thr_tsklet(unsigned long data)
|
|
{
|
|
struct bcm_op *op = (struct bcm_op *)data;
|
|
|
|
/* push the changed data to the userspace */
|
|
bcm_rx_thr_flush(op, 1);
|
|
}
|
|
|
|
/*
|
|
* bcm_rx_thr_handler - the time for blocked content updates is over now:
|
|
* Check for throttled data and send it to the userspace
|
|
*/
|
|
static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
|
|
{
|
|
struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
|
|
|
|
tasklet_schedule(&op->thrtsklet);
|
|
|
|
if (bcm_rx_thr_flush(op, 0)) {
|
|
hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
|
|
return HRTIMER_RESTART;
|
|
} else {
|
|
/* rearm throttle handling */
|
|
op->kt_lastmsg = ktime_set(0, 0);
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
const struct can_frame *rxframe = (struct can_frame *)skb->data;
|
|
int i;
|
|
|
|
/* disable timeout */
|
|
hrtimer_cancel(&op->timer);
|
|
|
|
if (op->can_id != rxframe->can_id)
|
|
return;
|
|
|
|
/* save rx timestamp */
|
|
op->rx_stamp = skb->tstamp;
|
|
/* save originator for recvfrom() */
|
|
op->rx_ifindex = skb->dev->ifindex;
|
|
/* update statistics */
|
|
op->frames_abs++;
|
|
|
|
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);
|
|
goto rx_starttimer;
|
|
}
|
|
|
|
if (op->nframes == 1) {
|
|
/* simple compare with index 0 */
|
|
bcm_rx_cmp_to_index(op, 0, rxframe);
|
|
goto rx_starttimer;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
rx_starttimer:
|
|
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)
|
|
{
|
|
hrtimer_cancel(&op->timer);
|
|
hrtimer_cancel(&op->thrtimer);
|
|
|
|
if (op->tsklet.func)
|
|
tasklet_kill(&op->tsklet);
|
|
|
|
if (op->thrtsklet.func)
|
|
tasklet_kill(&op->thrtsklet);
|
|
|
|
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 (op->frames[i].can_dlc > 8)
|
|
err = -EINVAL;
|
|
|
|
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 (op->frames[i].can_dlc > 8)
|
|
err = -EINVAL;
|
|
|
|
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 */
|
|
hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
op->timer.function = bcm_tx_timeout_handler;
|
|
|
|
/* initialize tasklet for tx countevent notification */
|
|
tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
|
|
(unsigned long) op);
|
|
|
|
/* currently unused in tx_ops */
|
|
hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
|
|
/* 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->kt_ival1 = timeval_to_ktime(msg_head->ival1);
|
|
op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
|
|
|
|
/* disable an active timer due to zero values? */
|
|
if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
|
|
hrtimer_cancel(&op->timer);
|
|
}
|
|
|
|
if ((op->flags & STARTTIMER) &&
|
|
((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) {
|
|
|
|
/* spec: send can_frame when starting timer */
|
|
op->flags |= TX_ANNOUNCE;
|
|
|
|
if (op->kt_ival1.tv64 && (op->count > 0)) {
|
|
/* op->count-- is done in bcm_tx_timeout_handler */
|
|
hrtimer_start(&op->timer, op->kt_ival1,
|
|
HRTIMER_MODE_REL);
|
|
} else
|
|
hrtimer_start(&op->timer, op->kt_ival2,
|
|
HRTIMER_MODE_REL);
|
|
}
|
|
|
|
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 */
|
|
hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
op->timer.function = bcm_rx_timeout_handler;
|
|
|
|
/* initialize tasklet for rx timeout notification */
|
|
tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
|
|
(unsigned long) op);
|
|
|
|
hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
op->thrtimer.function = bcm_rx_thr_handler;
|
|
|
|
/* initialize tasklet for rx throttle handling */
|
|
tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
|
|
(unsigned long) op);
|
|
|
|
/* 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 */
|
|
hrtimer_cancel(&op->thrtimer);
|
|
hrtimer_cancel(&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->kt_ival1 = timeval_to_ktime(msg_head->ival1);
|
|
op->kt_ival2 = timeval_to_ktime(msg_head->ival2);
|
|
|
|
/* disable an active timer due to zero value? */
|
|
if (!op->kt_ival1.tv64)
|
|
hrtimer_cancel(&op->timer);
|
|
|
|
/*
|
|
* In any case cancel the throttle timer, flush
|
|
* potentially blocked msgs and reset throttle handling
|
|
*/
|
|
op->kt_lastmsg = ktime_set(0, 0);
|
|
hrtimer_cancel(&op->thrtimer);
|
|
bcm_rx_thr_flush(op, 1);
|
|
}
|
|
|
|
if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
|
|
hrtimer_start(&op->timer, op->kt_ival1,
|
|
HRTIMER_MODE_REL);
|
|
}
|
|
|
|
/* 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;
|
|
err = can_send(skb, 1); /* send with loopback */
|
|
dev_put(dev);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
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 valid message length from userspace */
|
|
if (size < MHSIZ || (size - MHSIZ) % CFSIZ)
|
|
return -EINVAL;
|
|
|
|
/* 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 exactly one can_frame behind the msg head */
|
|
if ((msg_head.nframes != 1) || (size != CFSIZ + MHSIZ))
|
|
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 (!net_eq(dev_net(dev), &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;
|
|
}
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
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 = proc_create_data(bo->procname, 0644,
|
|
proc_dir,
|
|
&bcm_proc_fops, 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);
|
|
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);
|