X-Git-Url: http://rtime.felk.cvut.cz/gitweb/socketcan-devel.git/blobdiff_plain/de2ee49b1c3a030d06f9cff84a41d6b59bf1c29f..cb42c174307d6fe15f5602716966dd9f6142cc57:/kernel/2.6/net/can/bcm.c diff --git a/kernel/2.6/net/can/bcm.c b/kernel/2.6/net/can/bcm.c index c9347a2..1b013a1 100644 --- a/kernel/2.6/net/can/bcm.c +++ b/kernel/2.6/net/can/bcm.c @@ -8,8 +8,7 @@ * 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, the following disclaimer and - * the referenced file 'COPYING'. + * 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. @@ -19,8 +18,8 @@ * * 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 as distributed in the 'COPYING' - * file from the main directory of the linux kernel source. + * 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. @@ -42,35 +41,41 @@ * */ -#include #include +#include #include +#include +#include +#include +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) +#include +#endif +#include #include #include -#include -#include +#include +#include +#include +#include +#include +#include #include +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) +#include +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25) +#include "compat.h" +#endif -#include -#include -#include - -#include /* for RCSID. Removed by mkpatch script */ +#include /* for RCSID. Removed by mkpatch script */ RCSID("$Id$"); -#ifdef CONFIG_CAN_DEBUG_CORE -static int debug = 0; -module_param(debug, int, S_IRUGO); -#define DBG(args...) (debug & 1 ? \ - (printk(KERN_DEBUG "BCM %s: ", __func__), \ - printk(args)) : 0) -#define DBG_FRAME(args...) (debug & 2 ? can_debug_cframe(args) : 0) -#define DBG_SKB(skb) (debug & 4 ? can_debug_skb(skb) : 0) -#else -#define DBG(args...) -#define DBG_FRAME(args...) -#define DBG_SKB(skb) -#endif +/* + * To send multiple CAN frame content within TX_SETUP or to filter + * CAN messages with multiplex index within RX_SETUP, the number of + * different filters is limited to 256 due to the one byte index value. + */ +#define MAX_NFRAMES 256 /* use of last_frames[index].can_dlc */ #define RX_RECV 0x40 /* received data for this element */ @@ -78,532 +83,901 @@ module_param(debug, int, S_IRUGO); #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 REGMASK(id) ((id & CAN_EFF_FLAG) ? \ + (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ + (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) -#define IDENT "bcm" +#define CAN_BCM_VERSION CAN_VERSION static __initdata const char banner[] = KERN_INFO - "CAN: broadcast manager (bcm) socket protocol " CAN_VERSION "\n"; + "can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"; -MODULE_DESCRIPTION("PF_CAN bcm sockets"); +MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Oliver Hartkopp "); +MODULE_ALIAS("can-proto-2"); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22) +#error This code only supports Kernel versions 2.6.22+ +#error For older 2.6 Kernels please use bcm-prior-2-6-22.c instead of bcm.c +#endif -#define GET_U64(p) (*(u64*)(p)->data) /* easy access */ +/* 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; + u32 flags; unsigned long frames_abs, frames_filtered; - struct timer_list timer, thrtimer; struct timeval ival1, ival2; - struct timeval rx_stamp; + struct hrtimer timer, thrtimer; + struct tasklet_struct tsklet, thrtsklet; + ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; int rx_ifindex; - int count; - int nframes; - int currframe; + u32 count; + u32 nframes; + u32 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; }; -struct bcm_opt { +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 struct proc_dir_entry *proc_dir = NULL; - -static int bcm_init(struct sock *sk); -static void bcm_notifier(unsigned long msg, void *data); -static int bcm_release(struct socket *sock); -static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, - int flags); -static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *msg, size_t size); -static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *msg, size_t size, int flags); -static unsigned int bcm_poll(struct file *file, struct socket *sock, - poll_table *wait); - -static int bcm_read_proc(char *page, char **start, off_t off, - int count, int *eof, void *data); - -static void bcm_tx_timeout_handler(unsigned long data); -static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk); -static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, - int ifindex, struct sock *sk); -static void bcm_can_tx(struct bcm_op *op); - -static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, - int ifindex, struct sock *sk); -static void bcm_rx_handler(struct sk_buff *skb, void *op); -static void bcm_rx_timeout_handler(unsigned long data); -static void bcm_rx_thr_handler(unsigned long data); -static void bcm_rx_cmp_to_index(struct bcm_op *op, int index, - struct can_frame *rxdata); -static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data); -static void bcm_rx_starttimer(struct bcm_op *op); -static void bcm_rx_update_and_send(struct bcm_op *op, - struct can_frame *lastdata, - struct can_frame *rxdata); -static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, - struct can_frame *frames, struct timeval *tv); - -static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, - int ifindex); -static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, - int ifindex); -static void bcm_remove_op(struct bcm_op *op); -static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, - int ifindex); -static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, - int ifindex); - -static struct proto_ops bcm_ops = { - .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 = bcm_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, -}; - -#ifdef CONFIG_CAN_BCM_USER -#define BCM_CAP (-1) -#else -#define BCM_CAP CAP_NET_RAW -#endif - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13) -struct bcm_sock { - struct sock sk; - struct bcm_opt opt; -}; - -#define bcm_sk(sk) (&((struct bcm_sock *)(sk))->opt) - -static struct proto bcm_proto = { - .name = "CAN_BCM", - .owner = THIS_MODULE, - .obj_size = sizeof(struct bcm_sock), - .init = bcm_init, -}; - -static struct can_proto bcm_can_proto = { - .type = SOCK_DGRAM, - .protocol = CAN_BCM, - .capability = BCM_CAP, - .ops = &bcm_ops, - .prot = &bcm_proto, -}; -#else -#define bcm_sk(sk) ((struct bcm_opt *)(sk)->sk_protinfo) - -static struct can_proto bcm_can_proto = { - .type = SOCK_DGRAM, - .protocol = CAN_BCM, - .capability = BCM_CAP, - .ops = &bcm_ops, - .owner = THIS_MODULE, - .obj_size = sizeof(struct bcm_opt), - .init = bcm_init, + char procname [32]; /* inode number in decimal with \0 */ }; -#endif -#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14) -static void *kzalloc(size_t size, unsigned int __nocast flags) -{ - void *ret = kmalloc(size, flags); - if (ret) - memset(ret, 0, size); - return ret; -} - -static inline void skb_get_timestamp(const struct sk_buff *skb, - struct timeval *stamp) -{ - stamp->tv_sec = skb->stamp.tv_sec; - stamp->tv_usec = skb->stamp.tv_usec; -} -static inline void skb_set_timestamp(struct sk_buff *skb, - const struct timeval *stamp) +static inline struct bcm_sock *bcm_sk(const struct sock *sk) { - skb->stamp.tv_sec = stamp->tv_sec; - skb->stamp.tv_usec = stamp->tv_usec; + return (struct bcm_sock *)sk; } -#endif #define CFSIZ sizeof(struct can_frame) #define OPSIZ sizeof(struct bcm_op) #define MHSIZ sizeof(struct bcm_msg_head) -static int __init bcm_module_init(void) +/* + * procfs functions + */ +static char *bcm_proc_getifname(char *result, int ifindex) { - printk(banner); - - can_proto_register(&bcm_can_proto); + struct net_device *dev; - /* create /proc/net/can/bcm directory */ - proc_dir = proc_mkdir(CAN_PROC_DIR"/"IDENT, NULL); + if (!ifindex) + return "any"; - if (proc_dir) - proc_dir->owner = THIS_MODULE; + read_lock(&dev_base_lock); + dev = __dev_get_by_index(&init_net, ifindex); + if (dev) + strcpy(result, dev->name); + else + strcpy(result, "???"); + read_unlock(&dev_base_lock); - return 0; + return result; } -static void __exit bcm_module_exit(void) +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) +static int bcm_proc_show(struct seq_file *m, void *v) { - can_proto_unregister(&bcm_can_proto); + char ifname[IFNAMSIZ]; + struct sock *sk = (struct sock *)m->private; + struct bcm_sock *bo = bcm_sk(sk); + struct bcm_op *op; - if (proc_dir) - remove_proc_entry(CAN_PROC_DIR"/"IDENT, NULL); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0) + seq_printf(m, ">>> socket %p", sk->sk_socket); + seq_printf(m, " / sk %p", sk); + seq_printf(m, " / bo %p", bo); +#else + seq_printf(m, ">>> socket %pK", sk->sk_socket); + seq_printf(m, " / sk %pK", sk); + seq_printf(m, " / bo %pK", bo); +#endif + seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); + seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); + seq_printf(m, " <<<\n"); -} + list_for_each_entry(op, &bo->rx_ops, list) { -/* initial settings at socket creation time */ + unsigned long reduction; -static int bcm_init(struct sock *sk) -{ - struct bcm_opt *bo = bcm_sk(sk); + /* print only active entries & prevent division by zero */ + if (!op->frames_abs) + continue; - bo->bound = 0; - bo->ifindex = 0; - bo->dropped_usr_msgs = 0; - bo->bcm_proc_read = NULL; + seq_printf(m, "rx_op: %03X %-5s ", + op->can_id, bcm_proc_getifname(ifname, op->ifindex)); + seq_printf(m, "[%u]%c ", op->nframes, + (op->flags & RX_CHECK_DLC)?'d':' '); + if (op->kt_ival1.tv64) + seq_printf(m, "timeo=%lld ", + (long long) + ktime_to_us(op->kt_ival1)); - INIT_LIST_HEAD(&bo->tx_ops); - INIT_LIST_HEAD(&bo->rx_ops); + if (op->kt_ival2.tv64) + seq_printf(m, "thr=%lld ", + (long long) + ktime_to_us(op->kt_ival2)); - return 0; -} + seq_printf(m, "# recv %ld (%ld) => reduction: ", + op->frames_filtered, op->frames_abs); -/* handling of netdevice problems */ + reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; -static void bcm_notifier(unsigned long msg, void *data) -{ - struct sock *sk = (struct sock *)data; - struct bcm_opt *bo = bcm_sk(sk); + seq_printf(m, "%s%ld%%\n", + (reduction == 100)?"near ":"", reduction); + } - DBG("called for sock %p\n", sk); + list_for_each_entry(op, &bo->tx_ops, list) { - switch (msg) { - case NETDEV_UNREGISTER: - bo->bound = 0; - bo->ifindex = 0; - /* fallthrough */ - case NETDEV_DOWN: - sk->sk_err = ENETDOWN; - if (!sock_flag(sk, SOCK_DEAD)) - sk->sk_error_report(sk); + seq_printf(m, "tx_op: %03X %s [%u] ", + op->can_id, + bcm_proc_getifname(ifname, op->ifindex), + op->nframes); + + if (op->kt_ival1.tv64) + seq_printf(m, "t1=%lld ", + (long long) ktime_to_us(op->kt_ival1)); + + if (op->kt_ival2.tv64) + seq_printf(m, "t2=%lld ", + (long long) ktime_to_us(op->kt_ival2)); + + seq_printf(m, "# sent %ld\n", op->frames_abs); } + seq_putc(m, '\n'); + return 0; } -/* standard socket functions */ +static int bcm_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, bcm_proc_show, PDE(inode)->data); +} -static int bcm_release(struct socket *sock) +static const struct file_operations bcm_proc_fops = { + .owner = THIS_MODULE, + .open = bcm_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#else +static int bcm_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) { - struct sock *sk = sock->sk; - struct bcm_opt *bo = bcm_sk(sk); - struct bcm_op *op, *next; + char ifname[IFNAMSIZ]; + int len = 0; + struct sock *sk = (struct sock *)data; + struct bcm_sock *bo = bcm_sk(sk); + struct bcm_op *op; - DBG("socket %p, sk %p\n", sock, sk); + 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(ifname, bo->ifindex)); + len += snprintf(page + len, PAGE_SIZE - len, " <<<\n"); - /* remove bcm_ops, timer, rx_unregister(), etc. */ + list_for_each_entry(op, &bo->rx_ops, list) { - list_for_each_entry_safe(op, next, &bo->tx_ops, list) { - DBG("removing tx_op %p for can_id %03X\n", op, op->can_id); - bcm_remove_op(op); - } + unsigned long reduction; - list_for_each_entry_safe(op, next, &bo->rx_ops, list) { - DBG("removing rx_op %p for can_id %03X\n", op, op->can_id); + /* print only active entries & prevent division by zero */ + if (!op->frames_abs) + continue; - /* - * 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) { - struct net_device *dev = dev_get_by_index(op->ifindex); + len += snprintf(page + len, PAGE_SIZE - len, + "rx_op: %03X %-5s ", + op->can_id, bcm_proc_getifname(ifname, op->ifindex)); + len += snprintf(page + len, PAGE_SIZE - len, "[%d]%c ", + op->nframes, + (op->flags & RX_CHECK_DLC)?'d':' '); + if (op->kt_ival1.tv64) + len += snprintf(page + len, PAGE_SIZE - len, + "timeo=%lld ", + (long long) + ktime_to_us(op->kt_ival1)); - if (dev) { - can_rx_unregister(dev, op->can_id, - REGMASK(op->can_id), - bcm_rx_handler, op); - dev_put(dev); - } - } else - can_rx_unregister(NULL, op->can_id, - REGMASK(op->can_id), - bcm_rx_handler, op); + if (op->kt_ival2.tv64) + len += snprintf(page + len, PAGE_SIZE - len, + "thr=%lld ", + (long long) + ktime_to_us(op->kt_ival2)); - bcm_remove_op(op); - } + len += snprintf(page + len, PAGE_SIZE - len, + "# recv %ld (%ld) => reduction: ", + op->frames_filtered, op->frames_abs); - /* remove procfs entry */ - if ((proc_dir) && (bo->bcm_proc_read)) { - remove_proc_entry(bo->procname, proc_dir); - } + reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; - /* remove device notifier */ - if (bo->ifindex) { - struct net_device *dev = dev_get_by_index(bo->ifindex); + len += snprintf(page + len, PAGE_SIZE - len, "%s%ld%%\n", + (reduction == 100)?"near ":"", reduction); - if (dev) { - can_dev_unregister(dev, bcm_notifier, sk); - dev_put(dev); + if (len > PAGE_SIZE - 200) { + /* mark output cut off */ + len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); + break; } } - sock_put(sk); + list_for_each_entry(op, &bo->tx_ops, list) { - return 0; -} + len += snprintf(page + len, PAGE_SIZE - len, + "tx_op: %03X %s [%d] ", + op->can_id, + bcm_proc_getifname(ifname, op->ifindex), + op->nframes); -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_opt *bo = bcm_sk(sk); + if (op->kt_ival1.tv64) + len += snprintf(page + len, PAGE_SIZE - len, "t1=%lld ", + (long long) ktime_to_us(op->kt_ival1)); - if (bo->bound) - return -EISCONN; + if (op->kt_ival2.tv64) + len += snprintf(page + len, PAGE_SIZE - len, "t2=%lld ", + (long long) ktime_to_us(op->kt_ival2)); - /* bind a device to this socket */ - if (addr->can_ifindex) { - struct net_device *dev = dev_get_by_index(addr->can_ifindex); + len += snprintf(page + len, PAGE_SIZE - len, "# sent %ld\n", + op->frames_abs); - if (!dev) { - DBG("could not find device index %d\n", - addr->can_ifindex); - return -ENODEV; + if (len > PAGE_SIZE - 100) { + /* mark output cut off */ + len += snprintf(page + len, PAGE_SIZE - len, "(..)\n"); + break; } - bo->ifindex = dev->ifindex; - can_dev_register(dev, bcm_notifier, sk); /* register notif. */ - dev_put(dev); - - DBG("socket %p bound to device %s (idx %d)\n", - sock, dev->name, dev->ifindex); - } else { - /* no notifier 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); - } + len += snprintf(page + len, PAGE_SIZE - len, "\n"); - return 0; + *eof = 1; + return len; } +#endif -static int bcm_sendmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *msg, size_t size) +/* + * 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 sock *sk = sock->sk; - struct bcm_opt *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 */ + struct sk_buff *skb; + struct net_device *dev; + struct can_frame *cf = &op->frames[op->currframe]; - if (!bo->bound) { - DBG("sock %p not bound\n", sk); - return -ENOTCONN; + /* 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; } - /* check for alternative ifindex for this bcm_op */ + skb = alloc_skb(CFSIZ, gfp_any()); + if (!skb) + goto out; - if (!ifindex && msg->msg_name) { - /* no bound device as default => check msg_name */ - struct sockaddr_can *addr = - (struct sockaddr_can *)msg->msg_name; + memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); - if (addr->can_family != AF_CAN) - return -EINVAL; + /* send with loopback */ + skb->dev = dev; + skb->sk = op->sk; + can_send(skb, 1); - ifindex = addr->can_ifindex; /* ifindex from sendto() */ + /* update statistics */ + op->currframe++; + op->frames_abs++; - if (ifindex && !dev_get_by_index(ifindex)) { - DBG("device %d not found\n", ifindex); - return -ENODEV; + /* 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; + unsigned 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++; + } +} + +static void bcm_tx_timeout_tsklet(unsigned long data) +{ + struct bcm_op *op = (struct bcm_op *)data; + struct bcm_msg_head msg_head; + + if (op->kt_ival1.tv64 && (op->count > 0)) { + + op->count--; + if (!op->count && (op->flags & TX_COUNTEVT)) { + + /* 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); } } - /* read message head information */ + if (op->kt_ival1.tv64 && (op->count > 0)) { - ret = memcpy_fromiovec((u8*)&msg_head, msg->msg_iov, MHSIZ); - if (ret < 0) - return ret; + /* send (next) frame */ + bcm_can_tx(op); + hrtimer_start(&op->timer, + ktime_add(ktime_get(), op->kt_ival1), + HRTIMER_MODE_ABS); - DBG("opcode %d for can_id %03X\n", msg_head.opcode, msg_head.can_id); + } else { + if (op->kt_ival2.tv64) { - switch (msg_head.opcode) { + /* send (next) frame */ + bcm_can_tx(op); + hrtimer_start(&op->timer, + ktime_add(ktime_get(), op->kt_ival2), + HRTIMER_MODE_ABS); + } + } +} - case TX_SETUP: +/* + * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions + */ +static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) +{ + struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); - ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); - break; + tasklet_schedule(&op->tsklet); - case RX_SETUP: + return HRTIMER_NORESTART; +} - ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); - break; +/* + * 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; - case TX_DELETE: + /* update statistics */ + op->frames_filtered++; - if (bcm_delete_tx_op(&bo->tx_ops, msg_head.can_id, ifindex)) - ret = MHSIZ; - else - ret = -EINVAL; - break; - - case RX_DELETE: + /* prevent statistics overflow */ + if (op->frames_filtered > ULONG_MAX/100) + op->frames_filtered = op->frames_abs = 0; - if (bcm_delete_rx_op(&bo->rx_ops, msg_head.can_id, ifindex)) - ret = MHSIZ; - else - ret = -EINVAL; - break; + /* this element is not throttled anymore */ + data->can_dlc &= (BCM_CAN_DLC_MASK|RX_RECV); - case TX_READ: + 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; - /* 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; + bcm_send_to_user(op, &head, data, 1); +} - case RX_READ: +#if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,25) +/* is part of linux/hrtimer.h since 2.6.26 */ +static inline int hrtimer_callback_running(struct hrtimer *timer) +{ + return timer->state & HRTIMER_STATE_CALLBACK; +} +#endif +#if LINUX_VERSION_CODE == KERNEL_VERSION(2,6,22) +static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier) +{ + return ktime_to_us(ktime_sub(later, earlier)); +} +#endif +/* + * 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, + const struct can_frame *rxdata) +{ + memcpy(lastdata, rxdata, CFSIZ); - /* 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; + /* mark as used and throttled by default */ + lastdata->can_dlc |= (RX_RECV|RX_THR); - case TX_SEND: + /* throtteling mode inactive ? */ + if (!op->kt_ival2.tv64) { + /* send RX_CHANGED to the user immediately */ + bcm_rx_changed(op, lastdata); + return; + } - /* we need at least one can_frame */ - if (msg_head.nframes < 1) - return -EINVAL; + /* with active throttling timer we are just done here */ + if (hrtimer_active(&op->thrtimer)) + return; - ret = bcm_tx_send(msg, ifindex, sk); - break; + /* first receiption with enabled throttling mode */ + if (!op->kt_lastmsg.tv64) + goto rx_changed_settime; + + /* got a second frame inside a potential throttle period? */ + if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < + ktime_to_us(op->kt_ival2)) { + /* do not send the saved data - only start throttle timer */ + hrtimer_start(&op->thrtimer, + ktime_add(op->kt_lastmsg, op->kt_ival2), + HRTIMER_MODE_ABS); + return; + } - default: + /* the gap was that big, that throttling was not needed here */ +rx_changed_settime: + bcm_rx_changed(op, lastdata); + op->kt_lastmsg = ktime_get(); +} - DBG("Unknown opcode %d\n", msg_head.opcode); - ret = -EINVAL; - break; +/* + * 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, unsigned int index, + const 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; } - return ret; + /* 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; + } + } } -static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock, - struct msghdr *msg, size_t size, int flags) +/* + * bcm_rx_starttimer - enable timeout monitoring for CAN frame receiption + */ +static void bcm_rx_starttimer(struct bcm_op *op) { - struct sock *sk = sock->sk; - struct sk_buff *skb; - int error = 0; - int noblock; - int err; + if (op->flags & RX_NO_AUTOTIMER) + return; - DBG("socket %p, sk %p\n", sock, sk); + if (op->kt_ival1.tv64) + hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); +} - noblock = flags & MSG_DONTWAIT; - flags &= ~MSG_DONTWAIT; - skb = skb_recv_datagram(sk, flags, noblock, &error); - if (!skb) - return error; +static void bcm_rx_timeout_tsklet(unsigned long data) +{ + struct bcm_op *op = (struct bcm_op *)data; + struct bcm_msg_head msg_head; - DBG("delivering skbuff %p\n", skb); - DBG_SKB(skb); + /* 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; - if (skb->len < size) - size = skb->len; + bcm_send_to_user(op, &msg_head, NULL, 0); +} - err = memcpy_toiovec(msg->msg_iov, skb->data, size); - if (err < 0) { - skb_free_datagram(sk, skb); - return err; +/* + * 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); } - sock_recv_timestamp(msg, sk, skb); + return HRTIMER_NORESTART; +} - if (msg->msg_name) { - msg->msg_namelen = sizeof(struct sockaddr_can); - memcpy(msg->msg_name, skb->cb, msg->msg_namelen); +/* + * bcm_rx_do_flush - helper for bcm_rx_thr_flush + */ +static inline int bcm_rx_do_flush(struct bcm_op *op, int update, + unsigned 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; +} - DBG("freeing sock %p, skbuff %p\n", sk, skb); - skb_free_datagram(sk, skb); +/* + * 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; - return size; + if (op->nframes > 1) { + unsigned 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; + unsigned 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 */ } -static unsigned int bcm_poll(struct file *file, struct socket *sock, - poll_table *wait) +/* + * 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) { - unsigned int mask = 0; + struct bcm_op *op, *n; - DBG("socket %p\n", sock); + 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 */ + } + } - mask = datagram_poll(file, sock, wait); - return mask; + return 0; /* not found */ } -/* helper functions for bcm_sendmsg() */ +/* + * 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_opt *bo = bcm_sk(sk); + struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; - int i, err; + unsigned int i; + int 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) + /* check nframes boundaries - we need at least one can_frame */ + if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) return -EINVAL; /* check the given can_id */ - op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex); - if (op) { + if (op) { /* update existing BCM operation */ - DBG("TX_SETUP: modifying existing tx_op %p for can_id %03X\n", - op, msg_head->can_id); - /* * Do we need more space for the can_frames than currently * allocated? -> This is a _really_ unusual use-case and @@ -614,8 +988,12 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, /* update can_frames content */ for (i = 0; i < msg_head->nframes; i++) { - err = memcpy_fromiovec((u8*)&op->frames[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; @@ -632,23 +1010,29 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (!op) return -ENOMEM; - DBG("TX_SETUP: creating new tx_op %p for can_id %03X\n", - op, msg_head->can_id); - op->can_id = msg_head->can_id; /* 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; - } + 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], + err = memcpy_fromiovec((u8 *)&op->frames[i], msg->msg_iov, CFSIZ); + + if (op->frames[i].can_dlc > 8) + err = -EINVAL; + if (err < 0) { - kfree(op->frames); + if (op->frames != &op->sframe) + kfree(op->frames); kfree(op); return err; } @@ -664,20 +1048,18 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, /* bcm_can_tx / bcm_tx_timeout_handler needs this */ op->sk = sk; - op->ifindex = ifindex; - /* initialize uninitialized (kmalloc) structure */ - init_timer(&op->timer); - - /* currently unused in tx_ops */ - init_timer(&op->thrtimer); - - /* handler for tx_ops */ + /* initialize uninitialized (kzalloc) structure */ + hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); op->timer.function = bcm_tx_timeout_handler; - /* timer.data points to this op-structure */ - op->timer.data = (unsigned long)op; + /* 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); @@ -696,55 +1078,35 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (op->flags & TX_RESET_MULTI_IDX) { /* start multiple frame transmission with index 0 */ - op->currframe = 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 = timeval2jiffies(&msg_head->ival1, 1); - op->j_ival2 = timeval2jiffies(&msg_head->ival2, 1); - - DBG("TX_SETUP: SETTIMER count=%d j_ival1=%ld j_ival2=%ld\n", - op->count, op->j_ival1, op->j_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->j_ival1 && !op->j_ival2) { - del_timer(&op->timer); - DBG("TX_SETUP: SETTIMER disabled timer.\n"); - } + if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) + hrtimer_cancel(&op->timer); } if ((op->flags & STARTTIMER) && - ((op->j_ival1 && op->count) || op->j_ival2)) { - - del_timer(&op->timer); + ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) { /* spec: send can_frame when starting timer */ op->flags |= TX_ANNOUNCE; - if (op->j_ival1 && (op->count > 0)){ - op->timer.expires = jiffies + op->j_ival1; + if (op->kt_ival1.tv64 && (op->count > 0)) { /* op->count-- is done in bcm_tx_timeout_handler */ - DBG("TX_SETUP: adding timer ival1. func=%p data=%p " - "exp=0x%08X\n", - op->timer.function, - (char*) op->timer.data, - (unsigned int) op->timer.expires); - } else{ - op->timer.expires = jiffies + op->j_ival2; - DBG("TX_SETUP: adding timer ival2. func=%p data=%p " - "exp=0x%08X\n", - op->timer.function, - (char*) op->timer.data, - (unsigned int) op->timer.expires); - } - - add_timer(&op->timer); + 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) @@ -753,37 +1115,38 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, 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_opt *bo = bcm_sk(sk); + struct bcm_sock *bo = bcm_sk(sk); struct bcm_op *op; int do_rx_register; - int err; + int err = 0; if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { /* be robust against wrong usage ... */ msg_head->flags |= RX_FILTER_ID; - msg_head->nframes = 0; /* ignore trailing garbage */ + /* ignore trailing garbage */ + msg_head->nframes = 0; } + /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ + if (msg_head->nframes > MAX_NFRAMES + 1) + return -EINVAL; + if ((msg_head->flags & RX_RTR_FRAME) && ((msg_head->nframes != 1) || - (!(msg_head->can_id & CAN_RTR_FLAG)))) { - - DBG("RX_SETUP: bad RX_RTR_FRAME setup!\n"); + (!(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 */ - DBG("RX_SETUP: modifying existing rx_op %p for can_id %03X\n", - op, msg_head->can_id); - /* * Do we need more space for the can_frames than currently * allocated? -> This is a _really_ unusual use-case and @@ -794,7 +1157,7 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, if (msg_head->nframes) { /* update can_frames content */ - err = memcpy_fromiovec((u8*)op->frames, + err = memcpy_fromiovec((u8 *)op->frames, msg->msg_iov, msg_head->nframes * CFSIZ); if (err < 0) @@ -805,24 +1168,20 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, } 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; - DBG("RX_SETUP: creating new rx_op %p for can_id %03X\n", - op, msg_head->can_id); - op->can_id = msg_head->can_id; op->nframes = msg_head->nframes; - if (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); @@ -831,14 +1190,6 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, return -ENOMEM; } - err = memcpy_fromiovec((u8*)op->frames, msg->msg_iov, - msg_head->nframes * CFSIZ); - if (err < 0) { - kfree(op->frames); - kfree(op); - return err; - } - /* create and init array for received can_frames */ op->last_frames = kzalloc(msg_head->nframes * CFSIZ, GFP_KERNEL); @@ -846,839 +1197,599 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, kfree(op->frames); kfree(op); return -ENOMEM; - } - } else { - /* op->frames = NULL due to memset in kzalloc() */ - - /* - * even when we have the RX_FILTER_ID case, we need - * to store the last frame for the throttle feature - */ - - /* create and init array for received can_frames */ - op->last_frames = kzalloc(CFSIZ, GFP_KERNEL); - if (!op->last_frames) { - kfree(op); - return -ENOMEM; - } - } - - op->sk = sk; /* bcm_delete_rx_op() needs this */ - op->ifindex = ifindex; - - /* initialize uninitialized (kmalloc) structure */ - init_timer(&op->timer); - - /* init throttle timer for RX_CHANGED */ - init_timer(&op->thrtimer); - - /* handler for rx timeouts */ - op->timer.function = bcm_rx_timeout_handler; - - /* timer.data points to this op-structure */ - op->timer.data = (unsigned long)op; - - /* handler for RX_CHANGED throttle timeouts */ - op->thrtimer.function = bcm_rx_thr_handler; - - /* timer.data points to this op-structure */ - op->thrtimer.data = (unsigned long)op; - - op->thrtimer.expires = 0; /* mark disabled timer */ - - /* add this bcm_op to the list of the tx_ops */ - list_add(&op->list, &bo->rx_ops); - - do_rx_register = 1; /* call can_rx_register() */ - - } /* 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 = timeval2jiffies(&msg_head->ival1, 1); - op->j_ival2 = timeval2jiffies(&msg_head->ival2, 1); - - DBG("RX_SETUP: SETTIMER j_ival1=%ld j_ival2=%ld\n", - op->j_ival1, op->j_ival2); - - /* disable an active timer due to zero value? */ - if (!op->j_ival1) { - del_timer(&op->timer); - DBG("RX_SETUP: disabled timer rx timeouts.\n"); - } - - /* free currently blocked msgs ? */ - if (op->thrtimer.expires) { - DBG("RX_SETUP: unblocking throttled msgs.\n"); - del_timer(&op->thrtimer); - /* send blocked msgs hereafter */ - op->thrtimer.expires = jiffies + 2; - add_timer(&op->thrtimer); - } - /* - * 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) { - - del_timer(&op->timer); - - op->timer.expires = jiffies + op->j_ival1; - - DBG("RX_SETUP: adding timer ival1. func=%p data=%p" - " exp=0x%08X\n", - (char *) op->timer.function, - (char *) op->timer.data, - (unsigned int) op->timer.expires); - - add_timer(&op->timer); - } - } - - /* now we can register for can_ids, if we added a new bcm_op */ - if (do_rx_register) { - DBG("RX_SETUP: can_rx_register() for can_id %03X. " - "rx_op is %p\n", op->can_id, op); - - if (ifindex) { - struct net_device *dev = dev_get_by_index(ifindex); - - if (dev) { - can_rx_register(dev, op->can_id, - REGMASK(op->can_id), - bcm_rx_handler, op, IDENT); - dev_put(dev); - } - } else - can_rx_register(NULL, op->can_id, REGMASK(op->can_id), - bcm_rx_handler, op, IDENT); - } - - return msg_head->nframes * CFSIZ + MHSIZ; -} - -static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk) -{ - struct sk_buff *skb; - struct net_device *dev; - int err; - - /* just copy and send one can_frame */ - - if (!ifindex) /* we need a real device to send frames */ - 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; - } - - DBG_FRAME("BCM: TX_SEND: sending frame", - (struct can_frame *)skb->data); - - dev = dev_get_by_index(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; -} - -static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, - int ifindex) -{ - struct bcm_op *op; - int ret; - - op = bcm_find_op(ops, msg_head->can_id, ifindex); - if (op) { - - DBG("TRX_READ: sending status for can_id %03X\n", - msg_head->can_id); - /* 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, NULL); - - ret = MHSIZ; - - } else { - - DBG("TRX_READ: did not find op for can_id %03X\n", - msg_head->can_id); - ret = -EINVAL; - } - - return ret; -} - -/* procfs functions */ - -static char *bcm_proc_getifname(int ifindex) -{ - struct net_device *dev; - - if (!ifindex) - return "any"; - - dev = __dev_get_by_index(ifindex); /* no usage counting */ - 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_opt *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_op handling tx path */ - -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]; - - DBG_FRAME("BCM: bcm_can_tx: sending frame", cf); + } - /* no target device? => exit */ - if (!op->ifindex) - return; + } else { + op->frames = &op->sframe; + op->last_frames = &op->last_sframe; + } - dev = dev_get_by_index(op->ifindex); + 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; + } + } - if (!dev) { - /* RFC: should this bcm_op remove itself here? */ - return; - } + /* bcm_can_tx / bcm_tx_timeout_handler needs this */ + op->sk = sk; + op->ifindex = ifindex; - skb = alloc_skb(CFSIZ, - in_interrupt() ? GFP_ATOMIC : GFP_KERNEL); + /* initialize uninitialized (kzalloc) structure */ + hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + op->timer.function = bcm_rx_timeout_handler; - if (!skb) - goto out; + /* initialize tasklet for rx timeout notification */ + tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, + (unsigned long) op); - memcpy(skb_put(skb, CFSIZ), cf, CFSIZ); + hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + op->thrtimer.function = bcm_rx_thr_handler; - /* send with loopback */ - skb->dev = dev; - skb->sk = op->sk; - can_send(skb, 1); + /* initialize tasklet for rx throttle handling */ + tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, + (unsigned long) op); - /* update statistics */ - op->currframe++; - op->frames_abs++; + /* add this bcm_op to the list of the rx_ops */ + list_add(&op->list, &bo->rx_ops); - /* reached last frame? */ - if (op->currframe >= op->nframes) - op->currframe = 0; - out: - dev_put(dev); -} + /* call can_rx_register() */ + do_rx_register = 1; -static void bcm_tx_timeout_handler(unsigned long data) -{ - struct bcm_op *op = (struct bcm_op*)data; + } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ - DBG("Called with bcm_op %p\n", op); + /* check flags */ + op->flags = msg_head->flags; - if (op->j_ival1 && (op->count > 0)) { + if (op->flags & RX_RTR_FRAME) { - op->count--; + /* no timers in RTR-mode */ + hrtimer_cancel(&op->thrtimer); + hrtimer_cancel(&op->timer); - if (!op->count && (op->flags & TX_COUNTEVT)) { - /* create notification to user */ + /* + * 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; - struct bcm_msg_head msg_head; + } else { + if (op->flags & SETTIMER) { - DBG("sending TX_EXPIRED for can_id %03X\n", - op->can_id); + /* 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); - 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; + /* disable an active timer due to zero value? */ + if (!op->kt_ival1.tv64) + hrtimer_cancel(&op->timer); - bcm_send_to_user(op, &msg_head, NULL, NULL); + /* + * 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); } - } - DBG("count=%d j_ival1=%ld j_ival2=%ld\n", - op->count, op->j_ival1, op->j_ival2); - - if (op->j_ival1 && (op->count > 0)) { - - op->timer.expires = jiffies + op->j_ival1; - add_timer(&op->timer); + if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) + hrtimer_start(&op->timer, op->kt_ival1, + HRTIMER_MODE_REL); + } - DBG("adding timer ival1. func=%p data=%p exp=0x%08X\n", - op->timer.function, - (char*) op->timer.data, - (unsigned int) op->timer.expires); + /* now we can register for can_ids, if we added a new bcm_op */ + if (do_rx_register) { + if (ifindex) { + struct net_device *dev; - /* send (next) frame */ - bcm_can_tx(op); - } else { - if (op->j_ival2) { - op->timer.expires = jiffies + op->j_ival2; - add_timer(&op->timer); + 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"); - DBG("adding timer ival2. func=%p data=%p exp=0x%08X\n", - op->timer.function, - (char*) op->timer.data, - (unsigned int) op->timer.expires); + op->rx_reg_dev = dev; + dev_put(dev); + } - /* send (next) frame */ - bcm_can_tx(op); } else - DBG("no timer restart\n"); + 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; - + return msg_head->nframes * CFSIZ + MHSIZ; } -/* bcm_op handling rx path */ - -static void bcm_rx_handler(struct sk_buff *skb, void *data) +/* + * 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 bcm_op *op = (struct bcm_op*)data; - struct can_frame rxframe; - int i; + struct sk_buff *skb; + struct net_device *dev; + int err; - /* disable timeout */ - del_timer(&op->timer); - - DBG("Called with bcm_op %p\n", op); - - if (skb->len == sizeof(rxframe)) { - memcpy(&rxframe, skb->data, sizeof(rxframe)); - /* save rx timestamp */ - skb_get_timestamp(skb, &op->rx_stamp); - /* save originator for recvfrom() */ - op->rx_ifindex = skb->dev->ifindex; - /* update statistics */ - op->frames_abs++; + /* 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); - DBG("got can_frame with can_id %03X\n", rxframe.can_id); - } else { - DBG("Wrong skb->len = %d\n", skb->len); + return err; + } + + dev = dev_get_by_index(&init_net, ifindex); + if (!dev) { kfree_skb(skb); - return; + return -ENODEV; } - DBG_FRAME("BCM: bcm_rx_handler: CAN frame", &rxframe); + skb->dev = dev; + skb->sk = sk; + err = can_send(skb, 1); /* send with loopback */ + dev_put(dev); - if (op->can_id != rxframe.can_id) { - DBG("ERROR! Got wrong can_id %03X! Expected %03X.\n", - rxframe.can_id, op->can_id); - return; - } + if (err) + return err; - if (op->flags & RX_RTR_FRAME) { - /* send reply for RTR-request */ - DBG("RTR-request\n"); + return CFSIZ + MHSIZ; +} - /* send op->frames[0] to CAN device */ - bcm_can_tx(op); - return; - } +/* + * 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 (op->flags & RX_FILTER_ID) { - /* the easiest case */ - DBG("Easy does it with RX_FILTER_ID\n"); + if (!bo->bound) + return -ENOTCONN; - bcm_rx_update_and_send(op, &op->last_frames[0], &rxframe); - bcm_rx_starttimer(op); - return; - } + /* check for valid message length from userspace */ + if (size < MHSIZ || (size - MHSIZ) % CFSIZ) + return -EINVAL; - if (op->nframes == 1) { - /* simple compare with index 0 */ - DBG("Simple compare\n"); + /* check for alternative ifindex for this bcm_op */ - bcm_rx_cmp_to_index(op, 0, &rxframe); - bcm_rx_starttimer(op); - return; - } + if (!ifindex && msg->msg_name) { + /* no bound device as default => check msg_name */ + struct sockaddr_can *addr = + (struct sockaddr_can *)msg->msg_name; - if (op->nframes > 1) { - /* multiplex compare */ - DBG("Multiplex compare\n"); + if (msg->msg_namelen < sizeof(*addr)) + return -EINVAL; - /* - * find the first multiplex mask that fits. - * Remark: The MUX-mask is stored in index 0 - */ + if (addr->can_family != AF_CAN) + return -EINVAL; - for (i=1; i < op->nframes; i++) { + /* ifindex from sendto() */ + ifindex = addr->can_ifindex; - if ((GET_U64(&op->frames[0]) & GET_U64(&rxframe)) == - (GET_U64(&op->frames[0]) & - GET_U64(&op->frames[i]))) { - DBG("found MUX index %d\n", i); - bcm_rx_cmp_to_index(op, i, &rxframe); - break; + 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); } - bcm_rx_starttimer(op); } -} -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 - */ + /* read message head information */ - if (!(op->last_frames[index].can_dlc & RX_RECV)) { - /* received data for the first time => send update to user */ - DBG("first time :)\n"); - bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); - return; - } + ret = memcpy_fromiovec((u8 *)&msg_head, msg->msg_iov, MHSIZ); + if (ret < 0) + return ret; - /* do a real check in can_data */ + lock_sock(sk); - DBG("op->frames[index].data = 0x%016llx\n", - GET_U64(&op->frames[index])); - DBG("op->last_frames[index].data = 0x%016llx\n", - GET_U64(&op->last_frames[index])); - DBG("rxdata->data = 0x%016llx\n", GET_U64(rxdata)); + switch (msg_head.opcode) { - if ((GET_U64(&op->frames[index]) & GET_U64(rxdata)) != - (GET_U64(&op->frames[index]) & GET_U64(&op->last_frames[index]))) { - DBG("relevant data change :)\n"); - bcm_rx_update_and_send(op, &op->last_frames[index], rxdata); - return; - } + 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; - if (op->flags & RX_CHECK_DLC) { + 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; - /* do a real check in dlc */ + 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; - if (rxdata->can_dlc != (op->last_frames[index].can_dlc & - BCM_CAN_DLC_MASK)) { - DBG("dlc change :)\n"); - bcm_rx_update_and_send(op, &op->last_frames[index], - rxdata); - return; - } + 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; } - DBG("no relevant change :(\n"); + + release_sock(sk); + + return ret; } -static void bcm_rx_update_and_send(struct bcm_op *op, - struct can_frame *lastdata, - struct can_frame *rxdata) +/* + * notification handler for netdevice status changes + */ +static int bcm_notifier(struct notifier_block *nb, unsigned long msg, + void *data) { - unsigned long nexttx = op->j_lastmsg + op->j_ival2; + 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 LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) + if (dev->nd_net != &init_net) + return NOTIFY_DONE; +#endif - memcpy(lastdata, rxdata, CFSIZ); + if (dev->type != ARPHRD_CAN) + return NOTIFY_DONE; - /* mark as used */ - lastdata->can_dlc |= RX_RECV; + switch (msg) { - /* throttle bcm_rx_changed ? */ - if ((op->thrtimer.expires) || - ((op->j_ival2) && (nexttx > jiffies))) { - /* we are already waiting OR we have to start waiting */ + 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; + } - /* mark as 'throttled' */ - lastdata->can_dlc |= RX_THR; + release_sock(sk); - if (!(op->thrtimer.expires)) { - /* start the timer only the first time */ - op->thrtimer.expires = nexttx; - add_timer(&op->thrtimer); + if (notify_enodev) { + sk->sk_err = ENODEV; + if (!sock_flag(sk, SOCK_DEAD)) + sk->sk_error_report(sk); + } + break; - DBG("adding thrtimer. func=%p data=%p exp=0x%08X\n", - op->thrtimer.function, - (char*) op->thrtimer.data, - (unsigned int) op->thrtimer.expires); + 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); } - } else { - /* send RX_CHANGED to the user */ - bcm_rx_changed(op, rxdata); } + + return NOTIFY_DONE; } -static void bcm_rx_starttimer(struct bcm_op *op) +/* + * initial settings for all BCM sockets to be set at socket creation time + */ +static int bcm_init(struct sock *sk) { - if (op->flags & RX_NO_AUTOTIMER) - return; + struct bcm_sock *bo = bcm_sk(sk); + + bo->bound = 0; + bo->ifindex = 0; + bo->dropped_usr_msgs = 0; + bo->bcm_proc_read = NULL; - if (op->j_ival1) { + INIT_LIST_HEAD(&bo->tx_ops); + INIT_LIST_HEAD(&bo->rx_ops); - op->timer.expires = jiffies + op->j_ival1; + /* set notifier */ + bo->notifier.notifier_call = bcm_notifier; - DBG("adding rx timeout timer ival1. func=%p data=%p " - "exp=0x%08X\n", - op->timer.function, - (char*) op->timer.data, - (unsigned int) op->timer.expires); + register_netdevice_notifier(&bo->notifier); - add_timer(&op->timer); - } + return 0; } - -static void bcm_rx_changed(struct bcm_op *op, struct can_frame *data) +/* + * standard socket functions + */ +static int bcm_release(struct socket *sock) { - struct bcm_msg_head head; + struct sock *sk = sock->sk; + struct bcm_sock *bo; + struct bcm_op *op, *next; - op->j_lastmsg = jiffies; + if (sk == NULL) + return 0; - /* update statistics */ - op->frames_filtered++; + bo = bcm_sk(sk); - /* prevent statistics overflow */ - if (op->frames_filtered > ULONG_MAX/100) - op->frames_filtered = op->frames_abs = 0; + /* remove bcm_ops, timer, rx_unregister(), etc. */ - DBG("setting j_lastmsg to 0x%08X for rx_op %p\n", - (unsigned int) op->j_lastmsg, op); - DBG("sending notification\n"); + unregister_netdevice_notifier(&bo->notifier); - 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; + lock_sock(sk); - bcm_send_to_user(op, &head, data, &op->rx_stamp); -} + 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; -static void bcm_rx_timeout_handler(unsigned long data) -{ - struct bcm_op *op = (struct bcm_op*)data; - struct bcm_msg_head msg_head; + 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); - DBG("sending RX_TIMEOUT for can_id %03X. op is %p\n", op->can_id, op); + bcm_remove_op(op); + } - 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; + /* remove procfs entry */ + if (proc_dir && bo->bcm_proc_read) + remove_proc_entry(bo->procname, proc_dir); - bcm_send_to_user(op, &msg_head, NULL, NULL); + /* remove device reference */ + if (bo->bound) { + bo->bound = 0; + bo->ifindex = 0; + } - /* no restart of the timer is done here! */ + sock_orphan(sk); + sock->sk = NULL; - /* 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); - DBG("RX_ANNOUNCE_RESTART\n"); - } + release_sock(sk); + sock_put(sk); + return 0; } -static void bcm_rx_thr_handler(unsigned long data) +static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, + int flags) { - struct bcm_op *op = (struct bcm_op*)data; - int i = 0; + struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; + struct sock *sk = sock->sk; + struct bcm_sock *bo = bcm_sk(sk); - /* mark disabled / consumed timer */ - op->thrtimer.expires = 0; + if (len < sizeof(*addr)) + return -EINVAL; - if (op->nframes > 1){ + if (bo->bound) + return -EISCONN; - DBG("sending MUX RX_CHANGED for can_id %03X. op is %p\n", - op->can_id, op); - /* for MUX filter we start at index 1 */ - for (i=1; inframes; 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]); - } + /* 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; + } - DBG("sending simple RX_CHANGED for can_id %03X. op is %p\n", - op->can_id, op); - /* 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]); - } + bo->bound = 1; + + if (proc_dir) { + /* unique socket address as filename */ + sprintf(bo->procname, "%lu", sock_i_ino(sk)); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26) + bo->bcm_proc_read = proc_create_data(bo->procname, 0644, + proc_dir, + &bcm_proc_fops, sk); +#else + bo->bcm_proc_read = create_proc_read_entry(bo->procname, 0644, + proc_dir, + bcm_read_proc, sk); +#endif } + + return 0; } -static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, - struct can_frame *frames, struct timeval *tv) +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; - struct can_frame *firstframe; - struct sock *sk = op->sk; - int datalen = head->nframes * CFSIZ; - struct sockaddr_can *addr; + int error = 0; + int noblock; int err; - skb = alloc_skb(sizeof(*head) + datalen, - in_interrupt() ? GFP_ATOMIC : GFP_KERNEL); + noblock = flags & MSG_DONTWAIT; + flags &= ~MSG_DONTWAIT; + skb = skb_recv_datagram(sk, flags, noblock, &error); if (!skb) - return; - - memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); - - /* can_frames starting here */ - firstframe = (struct can_frame *) skb->tail; + return error; - if (tv) - skb_set_timestamp(skb, tv); /* restore timestamp */ + if (skb->len < size) + size = skb->len; - addr = (struct sockaddr_can *)skb->cb; - memset(addr, 0, sizeof(*addr)); - addr->can_family = AF_CAN; - /* restore originator for recvfrom() */ - addr->can_ifindex = op->rx_ifindex; + err = memcpy_toiovec(msg->msg_iov, skb->data, size); + if (err < 0) { + skb_free_datagram(sk, skb); + return err; + } - if (head->nframes){ - memcpy(skb_put(skb, datalen), frames, datalen); + sock_recv_timestamp(msg, sk, skb); - /* - * 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 (msg->msg_name) { + msg->msg_namelen = sizeof(struct sockaddr_can); + memcpy(msg->msg_name, skb->cb, msg->msg_namelen); } - err = sock_queue_rcv_skb(sk, skb); - if (err < 0) { - struct bcm_opt *bo = bcm_sk(sk); + skb_free_datagram(sk, skb); - DBG("sock_queue_rcv_skb failed: %d\n", err); - kfree_skb(skb); - /* don't care about overflows in this statistic */ - bo->dropped_usr_msgs++; - } + return size; } -/* bcm_op handling: find & delete bcm_op elements */ - -static struct bcm_op *bcm_find_op(struct list_head *ops, canid_t can_id, - int ifindex) -{ - struct bcm_op *op; +static const struct proto_ops bcm_ops = { + .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 = can_ioctl, /* 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, +}; - list_for_each_entry(op, ops, list) { - if ((op->can_id == can_id) && (op->ifindex == ifindex)) - return op; - } +static struct proto bcm_proto __read_mostly = { + .name = "CAN_BCM", + .owner = THIS_MODULE, + .obj_size = sizeof(struct bcm_sock), + .init = bcm_init, +}; - return NULL; -} +static const struct can_proto bcm_can_proto = { + .type = SOCK_DGRAM, + .protocol = CAN_BCM, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33) + .capability = -1, +#endif + .ops = &bcm_ops, + .prot = &bcm_proto, +}; -static int bcm_delete_rx_op(struct list_head *ops, canid_t can_id, int ifindex) +static int __init bcm_module_init(void) { - struct bcm_op *op, *n; - - list_for_each_entry_safe(op, n, ops, list) { - if ((op->can_id == can_id) && (op->ifindex == ifindex)) { - DBG("removing rx_op %p for can_id %03X\n", - op, op->can_id); - - /* - * 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) { - struct net_device *dev = - dev_get_by_index(op->ifindex); + int err; - if (dev) { - can_rx_unregister(dev, op->can_id, - REGMASK(op->can_id), - bcm_rx_handler, op); - dev_put(dev); - } - } else - can_rx_unregister(NULL, op->can_id, - REGMASK(op->can_id), - bcm_rx_handler, op); + printk(banner); - list_del(&op->list); - bcm_remove_op(op); - return 1; /* done */ - } + err = can_proto_register(&bcm_can_proto); + if (err < 0) { + printk(KERN_ERR "can: registration of bcm protocol failed\n"); + return err; } - return 0; /* not found */ -} - -static int bcm_delete_tx_op(struct list_head *ops, canid_t can_id, int ifindex) -{ - struct bcm_op *op, *n; + /* create /proc/net/can-bcm directory */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) + proc_dir = proc_mkdir("can-bcm", init_net.proc_net); +#else + proc_dir = proc_mkdir("can-bcm", proc_net); +#endif - list_for_each_entry_safe(op, n, ops, list) { - if ((op->can_id == can_id) && (op->ifindex == ifindex)) { - DBG("removing rx_op %p for can_id %03X\n", - op, op->can_id); - list_del(&op->list); - bcm_remove_op(op); - return 1; /* done */ - } - } +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30) + if (proc_dir) + proc_dir->owner = THIS_MODULE; +#endif - return 0; /* not found */ + return 0; } -static void bcm_remove_op(struct bcm_op *op) +static void __exit bcm_module_exit(void) { - del_timer(&op->timer); - del_timer(&op->thrtimer); - if (op->frames) - kfree(op->frames); - if (op->last_frames) - kfree(op->last_frames); - kfree(op); + can_proto_unregister(&bcm_can_proto); - return; + if (proc_dir) +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24) + proc_net_remove(&init_net, "can-bcm"); +#else + proc_net_remove("can-bcm"); +#endif } module_init(bcm_module_init);