Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1 | /* |
| 2 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content |
| 3 | * |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 4 | * Copyright (c) 2002-2016 Volkswagen Group Electronic Research |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of Volkswagen nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * Alternatively, provided that this notice is retained in full, this |
| 20 | * software may be distributed under the terms of the GNU General |
| 21 | * Public License ("GPL") version 2, in which case the provisions of the |
| 22 | * GPL apply INSTEAD OF those given above. |
| 23 | * |
| 24 | * The provided data structures and external interfaces from this code |
| 25 | * are not restricted to be used by modules with a GPL compatible license. |
| 26 | * |
| 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 38 | * DAMAGE. |
| 39 | * |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 40 | */ |
| 41 | |
| 42 | #include <linux/module.h> |
| 43 | #include <linux/init.h> |
Alexey Dobriyan | a6b7a40 | 2011-06-06 10:43:46 +0000 | [diff] [blame] | 44 | #include <linux/interrupt.h> |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 45 | #include <linux/hrtimer.h> |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 46 | #include <linux/list.h> |
| 47 | #include <linux/proc_fs.h> |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 48 | #include <linux/seq_file.h> |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 49 | #include <linux/uio.h> |
| 50 | #include <linux/net.h> |
| 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/socket.h> |
| 53 | #include <linux/if_arp.h> |
| 54 | #include <linux/skbuff.h> |
| 55 | #include <linux/can.h> |
| 56 | #include <linux/can/core.h> |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 57 | #include <linux/can/skb.h> |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 58 | #include <linux/can/bcm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 59 | #include <linux/slab.h> |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 60 | #include <net/sock.h> |
| 61 | #include <net/net_namespace.h> |
| 62 | |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 63 | /* |
| 64 | * To send multiple CAN frame content within TX_SETUP or to filter |
| 65 | * CAN messages with multiplex index within RX_SETUP, the number of |
| 66 | * different filters is limited to 256 due to the one byte index value. |
| 67 | */ |
| 68 | #define MAX_NFRAMES 256 |
| 69 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 70 | /* use of last_frames[index].flags */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 71 | #define RX_RECV 0x40 /* received data for this element */ |
| 72 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 73 | #define BCM_CAN_FLAGS_MASK 0x3F /* to clean private flags after usage */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 74 | |
| 75 | /* get best masking value for can_rx_register() for a given single can_id */ |
Oliver Hartkopp | d253eee | 2008-12-03 15:52:35 -0800 | [diff] [blame] | 76 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
| 77 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ |
| 78 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 79 | |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 80 | #define CAN_BCM_VERSION "20161123" |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 81 | |
| 82 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); |
| 83 | MODULE_LICENSE("Dual BSD/GPL"); |
| 84 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); |
Lothar Waßmann | b13bb2e | 2009-07-14 23:12:25 +0000 | [diff] [blame] | 85 | MODULE_ALIAS("can-proto-2"); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 86 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 87 | /* |
| 88 | * easy access to the first 64 bit of can(fd)_frame payload. cp->data is |
| 89 | * 64 bit aligned so the offset has to be multiples of 8 which is ensured |
| 90 | * by the only callers in bcm_rx_cmp_to_index() bcm_rx_handler(). |
| 91 | */ |
| 92 | static inline u64 get_u64(const struct canfd_frame *cp, int offset) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 93 | { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 94 | return *(u64 *)(cp->data + offset); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | struct bcm_op { |
| 98 | struct list_head list; |
| 99 | int ifindex; |
| 100 | canid_t can_id; |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 101 | u32 flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 102 | unsigned long frames_abs, frames_filtered; |
Arnd Bergmann | ba61a8d | 2015-09-30 13:26:42 +0200 | [diff] [blame] | 103 | struct bcm_timeval ival1, ival2; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 104 | struct hrtimer timer, thrtimer; |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 105 | struct tasklet_struct tsklet, thrtsklet; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 106 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 107 | int rx_ifindex; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 108 | int cfsiz; |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 109 | u32 count; |
| 110 | u32 nframes; |
| 111 | u32 currframe; |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 112 | /* void pointers to arrays of struct can[fd]_frame */ |
| 113 | void *frames; |
| 114 | void *last_frames; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 115 | struct canfd_frame sframe; |
| 116 | struct canfd_frame last_sframe; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 117 | struct sock *sk; |
| 118 | struct net_device *rx_reg_dev; |
| 119 | }; |
| 120 | |
| 121 | static struct proc_dir_entry *proc_dir; |
| 122 | |
| 123 | struct bcm_sock { |
| 124 | struct sock sk; |
| 125 | int bound; |
| 126 | int ifindex; |
| 127 | struct notifier_block notifier; |
| 128 | struct list_head rx_ops; |
| 129 | struct list_head tx_ops; |
| 130 | unsigned long dropped_usr_msgs; |
| 131 | struct proc_dir_entry *bcm_proc_read; |
Dan Rosenberg | 9f260e0 | 2010-12-26 06:54:53 +0000 | [diff] [blame] | 132 | char procname [32]; /* inode number in decimal with \0 */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 133 | }; |
| 134 | |
| 135 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) |
| 136 | { |
| 137 | return (struct bcm_sock *)sk; |
| 138 | } |
| 139 | |
Arnd Bergmann | ba61a8d | 2015-09-30 13:26:42 +0200 | [diff] [blame] | 140 | static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) |
| 141 | { |
| 142 | return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC); |
| 143 | } |
| 144 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 145 | #define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 146 | #define OPSIZ sizeof(struct bcm_op) |
| 147 | #define MHSIZ sizeof(struct bcm_msg_head) |
| 148 | |
| 149 | /* |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 150 | * procfs functions |
| 151 | */ |
Eric Dumazet | 6755aeb | 2009-11-06 00:23:01 +0000 | [diff] [blame] | 152 | static char *bcm_proc_getifname(char *result, int ifindex) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 153 | { |
| 154 | struct net_device *dev; |
| 155 | |
| 156 | if (!ifindex) |
| 157 | return "any"; |
| 158 | |
stephen hemminger | ff879eb | 2009-11-10 07:54:56 +0000 | [diff] [blame] | 159 | rcu_read_lock(); |
| 160 | dev = dev_get_by_index_rcu(&init_net, ifindex); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 161 | if (dev) |
Eric Dumazet | 6755aeb | 2009-11-06 00:23:01 +0000 | [diff] [blame] | 162 | strcpy(result, dev->name); |
| 163 | else |
| 164 | strcpy(result, "???"); |
stephen hemminger | ff879eb | 2009-11-10 07:54:56 +0000 | [diff] [blame] | 165 | rcu_read_unlock(); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 166 | |
Eric Dumazet | 6755aeb | 2009-11-06 00:23:01 +0000 | [diff] [blame] | 167 | return result; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 168 | } |
| 169 | |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 170 | static int bcm_proc_show(struct seq_file *m, void *v) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 171 | { |
Eric Dumazet | 6755aeb | 2009-11-06 00:23:01 +0000 | [diff] [blame] | 172 | char ifname[IFNAMSIZ]; |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 173 | struct sock *sk = (struct sock *)m->private; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 174 | struct bcm_sock *bo = bcm_sk(sk); |
| 175 | struct bcm_op *op; |
| 176 | |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 177 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
| 178 | seq_printf(m, " / sk %pK", sk); |
| 179 | seq_printf(m, " / bo %pK", bo); |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 180 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
Eric Dumazet | 6755aeb | 2009-11-06 00:23:01 +0000 | [diff] [blame] | 181 | seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex)); |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 182 | seq_printf(m, " <<<\n"); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 183 | |
| 184 | list_for_each_entry(op, &bo->rx_ops, list) { |
| 185 | |
| 186 | unsigned long reduction; |
| 187 | |
| 188 | /* print only active entries & prevent division by zero */ |
| 189 | if (!op->frames_abs) |
| 190 | continue; |
| 191 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 192 | seq_printf(m, "rx_op: %03X %-5s ", op->can_id, |
| 193 | bcm_proc_getifname(ifname, op->ifindex)); |
| 194 | |
| 195 | if (op->flags & CAN_FD_FRAME) |
| 196 | seq_printf(m, "(%u)", op->nframes); |
| 197 | else |
| 198 | seq_printf(m, "[%u]", op->nframes); |
| 199 | |
| 200 | seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' '); |
| 201 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 202 | if (op->kt_ival1.tv64) |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 203 | seq_printf(m, "timeo=%lld ", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 204 | (long long)ktime_to_us(op->kt_ival1)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 205 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 206 | if (op->kt_ival2.tv64) |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 207 | seq_printf(m, "thr=%lld ", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 208 | (long long)ktime_to_us(op->kt_ival2)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 209 | |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 210 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 211 | op->frames_filtered, op->frames_abs); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 212 | |
| 213 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; |
| 214 | |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 215 | seq_printf(m, "%s%ld%%\n", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 216 | (reduction == 100) ? "near " : "", reduction); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 217 | } |
| 218 | |
| 219 | list_for_each_entry(op, &bo->tx_ops, list) { |
| 220 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 221 | seq_printf(m, "tx_op: %03X %s ", op->can_id, |
| 222 | bcm_proc_getifname(ifname, op->ifindex)); |
| 223 | |
| 224 | if (op->flags & CAN_FD_FRAME) |
| 225 | seq_printf(m, "(%u) ", op->nframes); |
| 226 | else |
| 227 | seq_printf(m, "[%u] ", op->nframes); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 228 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 229 | if (op->kt_ival1.tv64) |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 230 | seq_printf(m, "t1=%lld ", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 231 | (long long)ktime_to_us(op->kt_ival1)); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 232 | |
| 233 | if (op->kt_ival2.tv64) |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 234 | seq_printf(m, "t2=%lld ", |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 235 | (long long)ktime_to_us(op->kt_ival2)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 236 | |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 237 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 238 | } |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 239 | seq_putc(m, '\n'); |
| 240 | return 0; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 241 | } |
| 242 | |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 243 | static int bcm_proc_open(struct inode *inode, struct file *file) |
| 244 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 245 | return single_open(file, bcm_proc_show, PDE_DATA(inode)); |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | static const struct file_operations bcm_proc_fops = { |
| 249 | .owner = THIS_MODULE, |
| 250 | .open = bcm_proc_open, |
| 251 | .read = seq_read, |
| 252 | .llseek = seq_lseek, |
| 253 | .release = single_release, |
| 254 | }; |
| 255 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 256 | /* |
| 257 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface |
| 258 | * of the given bcm tx op |
| 259 | */ |
| 260 | static void bcm_can_tx(struct bcm_op *op) |
| 261 | { |
| 262 | struct sk_buff *skb; |
| 263 | struct net_device *dev; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 264 | struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 265 | |
| 266 | /* no target device? => exit */ |
| 267 | if (!op->ifindex) |
| 268 | return; |
| 269 | |
| 270 | dev = dev_get_by_index(&init_net, op->ifindex); |
| 271 | if (!dev) { |
| 272 | /* RFC: should this bcm_op remove itself here? */ |
| 273 | return; |
| 274 | } |
| 275 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 276 | skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any()); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 277 | if (!skb) |
| 278 | goto out; |
| 279 | |
Oliver Hartkopp | 2bf3440 | 2013-01-28 08:33:33 +0000 | [diff] [blame] | 280 | can_skb_reserve(skb); |
| 281 | can_skb_prv(skb)->ifindex = dev->ifindex; |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 282 | can_skb_prv(skb)->skbcnt = 0; |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 283 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 284 | memcpy(skb_put(skb, op->cfsiz), cf, op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 285 | |
| 286 | /* send with loopback */ |
| 287 | skb->dev = dev; |
Oliver Hartkopp | 0ae89be | 2014-01-30 10:11:28 +0100 | [diff] [blame] | 288 | can_skb_set_owner(skb, op->sk); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 289 | can_send(skb, 1); |
| 290 | |
| 291 | /* update statistics */ |
| 292 | op->currframe++; |
| 293 | op->frames_abs++; |
| 294 | |
| 295 | /* reached last frame? */ |
| 296 | if (op->currframe >= op->nframes) |
| 297 | op->currframe = 0; |
Oliver Hartkopp | 95acb49 | 2016-06-17 15:35:24 +0200 | [diff] [blame] | 298 | out: |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 299 | dev_put(dev); |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * bcm_send_to_user - send a BCM message to the userspace |
| 304 | * (consisting of bcm_msg_head + x CAN frames) |
| 305 | */ |
| 306 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 307 | struct canfd_frame *frames, int has_timestamp) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 308 | { |
| 309 | struct sk_buff *skb; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 310 | struct canfd_frame *firstframe; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 311 | struct sockaddr_can *addr; |
| 312 | struct sock *sk = op->sk; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 313 | unsigned int datalen = head->nframes * op->cfsiz; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 314 | int err; |
| 315 | |
| 316 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); |
| 317 | if (!skb) |
| 318 | return; |
| 319 | |
| 320 | memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head)); |
| 321 | |
| 322 | if (head->nframes) { |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 323 | /* CAN frames starting here */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 324 | firstframe = (struct canfd_frame *)skb_tail_pointer(skb); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 325 | |
| 326 | memcpy(skb_put(skb, datalen), frames, datalen); |
| 327 | |
| 328 | /* |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 329 | * the BCM uses the flags-element of the canfd_frame |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 330 | * structure for internal purposes. This is only |
| 331 | * relevant for updates that are generated by the |
| 332 | * BCM, where nframes is 1 |
| 333 | */ |
| 334 | if (head->nframes == 1) |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 335 | firstframe->flags &= BCM_CAN_FLAGS_MASK; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | if (has_timestamp) { |
| 339 | /* restore rx timestamp */ |
| 340 | skb->tstamp = op->rx_stamp; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * Put the datagram to the queue so that bcm_recvmsg() can |
| 345 | * get it from there. We need to pass the interface index to |
| 346 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb |
| 347 | * containing the interface index. |
| 348 | */ |
| 349 | |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 350 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 351 | addr = (struct sockaddr_can *)skb->cb; |
| 352 | memset(addr, 0, sizeof(*addr)); |
| 353 | addr->can_family = AF_CAN; |
| 354 | addr->can_ifindex = op->rx_ifindex; |
| 355 | |
| 356 | err = sock_queue_rcv_skb(sk, skb); |
| 357 | if (err < 0) { |
| 358 | struct bcm_sock *bo = bcm_sk(sk); |
| 359 | |
| 360 | kfree_skb(skb); |
| 361 | /* don't care about overflows in this statistic */ |
| 362 | bo->dropped_usr_msgs++; |
| 363 | } |
| 364 | } |
| 365 | |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 366 | static void bcm_tx_start_timer(struct bcm_op *op) |
| 367 | { |
| 368 | if (op->kt_ival1.tv64 && op->count) |
| 369 | hrtimer_start(&op->timer, |
| 370 | ktime_add(ktime_get(), op->kt_ival1), |
| 371 | HRTIMER_MODE_ABS); |
| 372 | else if (op->kt_ival2.tv64) |
| 373 | hrtimer_start(&op->timer, |
| 374 | ktime_add(ktime_get(), op->kt_ival2), |
| 375 | HRTIMER_MODE_ABS); |
| 376 | } |
| 377 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 378 | static void bcm_tx_timeout_tsklet(unsigned long data) |
| 379 | { |
| 380 | struct bcm_op *op = (struct bcm_op *)data; |
| 381 | struct bcm_msg_head msg_head; |
| 382 | |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 383 | if (op->kt_ival1.tv64 && (op->count > 0)) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 384 | |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 385 | op->count--; |
| 386 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
| 387 | |
| 388 | /* create notification to user */ |
| 389 | msg_head.opcode = TX_EXPIRED; |
| 390 | msg_head.flags = op->flags; |
| 391 | msg_head.count = op->count; |
| 392 | msg_head.ival1 = op->ival1; |
| 393 | msg_head.ival2 = op->ival2; |
| 394 | msg_head.can_id = op->can_id; |
| 395 | msg_head.nframes = 0; |
| 396 | |
| 397 | bcm_send_to_user(op, &msg_head, NULL, 0); |
| 398 | } |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 399 | bcm_can_tx(op); |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 400 | |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 401 | } else if (op->kt_ival2.tv64) |
| 402 | bcm_can_tx(op); |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 403 | |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 404 | bcm_tx_start_timer(op); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 405 | } |
| 406 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 407 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 408 | * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 409 | */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 410 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 411 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 412 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 413 | |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 414 | tasklet_schedule(&op->tsklet); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 415 | |
Oliver Hartkopp | c53a6ee | 2009-01-14 21:06:55 -0800 | [diff] [blame] | 416 | return HRTIMER_NORESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | /* |
| 420 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content |
| 421 | */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 422 | static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 423 | { |
| 424 | struct bcm_msg_head head; |
| 425 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 426 | /* update statistics */ |
| 427 | op->frames_filtered++; |
| 428 | |
| 429 | /* prevent statistics overflow */ |
| 430 | if (op->frames_filtered > ULONG_MAX/100) |
| 431 | op->frames_filtered = op->frames_abs = 0; |
| 432 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 433 | /* this element is not throttled anymore */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 434 | data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 435 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 436 | head.opcode = RX_CHANGED; |
| 437 | head.flags = op->flags; |
| 438 | head.count = op->count; |
| 439 | head.ival1 = op->ival1; |
| 440 | head.ival2 = op->ival2; |
| 441 | head.can_id = op->can_id; |
| 442 | head.nframes = 1; |
| 443 | |
| 444 | bcm_send_to_user(op, &head, data, 1); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * bcm_rx_update_and_send - process a detected relevant receive content change |
| 449 | * 1. update the last received data |
| 450 | * 2. send a notification to the user (if possible) |
| 451 | */ |
| 452 | static void bcm_rx_update_and_send(struct bcm_op *op, |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 453 | struct canfd_frame *lastdata, |
| 454 | const struct canfd_frame *rxdata) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 455 | { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 456 | memcpy(lastdata, rxdata, op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 457 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 458 | /* mark as used and throttled by default */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 459 | lastdata->flags |= (RX_RECV|RX_THR); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 460 | |
Jeremiah Mahler | 069f845 | 2014-12-05 09:54:38 -0800 | [diff] [blame] | 461 | /* throttling mode inactive ? */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 462 | if (!op->kt_ival2.tv64) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 463 | /* send RX_CHANGED to the user immediately */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 464 | bcm_rx_changed(op, lastdata); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 465 | return; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 466 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 467 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 468 | /* with active throttling timer we are just done here */ |
| 469 | if (hrtimer_active(&op->thrtimer)) |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 470 | return; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 471 | |
Jeremiah Mahler | 069f845 | 2014-12-05 09:54:38 -0800 | [diff] [blame] | 472 | /* first reception with enabled throttling mode */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 473 | if (!op->kt_lastmsg.tv64) |
| 474 | goto rx_changed_settime; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 475 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 476 | /* got a second frame inside a potential throttle period? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 477 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
| 478 | ktime_to_us(op->kt_ival2)) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 479 | /* do not send the saved data - only start throttle timer */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 480 | hrtimer_start(&op->thrtimer, |
| 481 | ktime_add(op->kt_lastmsg, op->kt_ival2), |
| 482 | HRTIMER_MODE_ABS); |
| 483 | return; |
| 484 | } |
| 485 | |
| 486 | /* the gap was that big, that throttling was not needed here */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 487 | rx_changed_settime: |
| 488 | bcm_rx_changed(op, lastdata); |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 489 | op->kt_lastmsg = ktime_get(); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | /* |
| 493 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly |
| 494 | * received data stored in op->last_frames[] |
| 495 | */ |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 496 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 497 | const struct canfd_frame *rxdata) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 498 | { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 499 | struct canfd_frame *cf = op->frames + op->cfsiz * index; |
| 500 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
| 501 | int i; |
| 502 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 503 | /* |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 504 | * no one uses the MSBs of flags for comparison, |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 505 | * so we use it here to detect the first time of reception |
| 506 | */ |
| 507 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 508 | if (!(lcf->flags & RX_RECV)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 509 | /* received data for the first time => send update to user */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 510 | bcm_rx_update_and_send(op, lcf, rxdata); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 511 | return; |
| 512 | } |
| 513 | |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 514 | /* do a real check in CAN frame data section */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 515 | for (i = 0; i < rxdata->len; i += 8) { |
| 516 | if ((get_u64(cf, i) & get_u64(rxdata, i)) != |
| 517 | (get_u64(cf, i) & get_u64(lcf, i))) { |
| 518 | bcm_rx_update_and_send(op, lcf, rxdata); |
| 519 | return; |
| 520 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | if (op->flags & RX_CHECK_DLC) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 524 | /* do a real check in CAN frame length */ |
| 525 | if (rxdata->len != lcf->len) { |
| 526 | bcm_rx_update_and_send(op, lcf, rxdata); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 527 | return; |
| 528 | } |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | /* |
Jeremiah Mahler | 069f845 | 2014-12-05 09:54:38 -0800 | [diff] [blame] | 533 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 534 | */ |
| 535 | static void bcm_rx_starttimer(struct bcm_op *op) |
| 536 | { |
| 537 | if (op->flags & RX_NO_AUTOTIMER) |
| 538 | return; |
| 539 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 540 | if (op->kt_ival1.tv64) |
| 541 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 542 | } |
| 543 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 544 | static void bcm_rx_timeout_tsklet(unsigned long data) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 545 | { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 546 | struct bcm_op *op = (struct bcm_op *)data; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 547 | struct bcm_msg_head msg_head; |
| 548 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 549 | /* create notification to user */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 550 | msg_head.opcode = RX_TIMEOUT; |
| 551 | msg_head.flags = op->flags; |
| 552 | msg_head.count = op->count; |
| 553 | msg_head.ival1 = op->ival1; |
| 554 | msg_head.ival2 = op->ival2; |
| 555 | msg_head.can_id = op->can_id; |
| 556 | msg_head.nframes = 0; |
| 557 | |
| 558 | bcm_send_to_user(op, &msg_head, NULL, 0); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | /* |
Jeremiah Mahler | 069f845 | 2014-12-05 09:54:38 -0800 | [diff] [blame] | 562 | * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 563 | */ |
| 564 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) |
| 565 | { |
| 566 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); |
| 567 | |
| 568 | /* schedule before NET_RX_SOFTIRQ */ |
| 569 | tasklet_hi_schedule(&op->tsklet); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 570 | |
| 571 | /* no restart of the timer is done here! */ |
| 572 | |
| 573 | /* if user wants to be informed, when cyclic CAN-Messages come back */ |
| 574 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 575 | /* clear received CAN frames to indicate 'nothing received' */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 576 | memset(op->last_frames, 0, op->nframes * op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 577 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 578 | |
| 579 | return HRTIMER_NORESTART; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | /* |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 583 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 584 | */ |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 585 | static inline int bcm_rx_do_flush(struct bcm_op *op, int update, |
| 586 | unsigned int index) |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 587 | { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 588 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
| 589 | |
| 590 | if ((op->last_frames) && (lcf->flags & RX_THR)) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 591 | if (update) |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 592 | bcm_rx_changed(op, lcf); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 593 | return 1; |
| 594 | } |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
| 600 | * |
| 601 | * update == 0 : just check if throttled data is available (any irq context) |
| 602 | * update == 1 : check and send throttled data to userspace (soft_irq context) |
| 603 | */ |
| 604 | static int bcm_rx_thr_flush(struct bcm_op *op, int update) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 605 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 606 | int updated = 0; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 607 | |
| 608 | if (op->nframes > 1) { |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 609 | unsigned int i; |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 610 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 611 | /* for MUX filter we start at index 1 */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 612 | for (i = 1; i < op->nframes; i++) |
| 613 | updated += bcm_rx_do_flush(op, update, i); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 614 | |
| 615 | } else { |
| 616 | /* for RX_FILTER_ID and simple filter */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 617 | updated += bcm_rx_do_flush(op, update, 0); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 618 | } |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 619 | |
| 620 | return updated; |
| 621 | } |
| 622 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 623 | static void bcm_rx_thr_tsklet(unsigned long data) |
| 624 | { |
| 625 | struct bcm_op *op = (struct bcm_op *)data; |
| 626 | |
| 627 | /* push the changed data to the userspace */ |
| 628 | bcm_rx_thr_flush(op, 1); |
| 629 | } |
| 630 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 631 | /* |
| 632 | * bcm_rx_thr_handler - the time for blocked content updates is over now: |
| 633 | * Check for throttled data and send it to the userspace |
| 634 | */ |
| 635 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) |
| 636 | { |
| 637 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); |
| 638 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 639 | tasklet_schedule(&op->thrtsklet); |
| 640 | |
| 641 | if (bcm_rx_thr_flush(op, 0)) { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 642 | hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2); |
| 643 | return HRTIMER_RESTART; |
| 644 | } else { |
| 645 | /* rearm throttle handling */ |
| 646 | op->kt_lastmsg = ktime_set(0, 0); |
| 647 | return HRTIMER_NORESTART; |
| 648 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /* |
Jeremiah Mahler | 069f845 | 2014-12-05 09:54:38 -0800 | [diff] [blame] | 652 | * bcm_rx_handler - handle a CAN frame reception |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 653 | */ |
| 654 | static void bcm_rx_handler(struct sk_buff *skb, void *data) |
| 655 | { |
| 656 | struct bcm_op *op = (struct bcm_op *)data; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 657 | const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data; |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 658 | unsigned int i; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 659 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 660 | if (op->can_id != rxframe->can_id) |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 661 | return; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 662 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 663 | /* make sure to handle the correct frame type (CAN / CAN FD) */ |
| 664 | if (skb->len != op->cfsiz) |
| 665 | return; |
| 666 | |
| 667 | /* disable timeout */ |
| 668 | hrtimer_cancel(&op->timer); |
| 669 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 670 | /* save rx timestamp */ |
| 671 | op->rx_stamp = skb->tstamp; |
| 672 | /* save originator for recvfrom() */ |
| 673 | op->rx_ifindex = skb->dev->ifindex; |
| 674 | /* update statistics */ |
| 675 | op->frames_abs++; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 676 | |
| 677 | if (op->flags & RX_RTR_FRAME) { |
| 678 | /* send reply for RTR-request (placed in op->frames[0]) */ |
| 679 | bcm_can_tx(op); |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 680 | return; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | if (op->flags & RX_FILTER_ID) { |
| 684 | /* the easiest case */ |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 685 | bcm_rx_update_and_send(op, op->last_frames, rxframe); |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 686 | goto rx_starttimer; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | if (op->nframes == 1) { |
| 690 | /* simple compare with index 0 */ |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 691 | bcm_rx_cmp_to_index(op, 0, rxframe); |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 692 | goto rx_starttimer; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | if (op->nframes > 1) { |
| 696 | /* |
| 697 | * multiplex compare |
| 698 | * |
| 699 | * find the first multiplex mask that fits. |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 700 | * Remark: The MUX-mask is stored in index 0 - but only the |
| 701 | * first 64 bits of the frame data[] are relevant (CAN FD) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 702 | */ |
| 703 | |
| 704 | for (i = 1; i < op->nframes; i++) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 705 | if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) == |
| 706 | (get_u64(op->frames, 0) & |
| 707 | get_u64(op->frames + op->cfsiz * i, 0))) { |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 708 | bcm_rx_cmp_to_index(op, i, rxframe); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 709 | break; |
| 710 | } |
| 711 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 712 | } |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 713 | |
Oliver Hartkopp | 1fa17d4 | 2009-01-06 11:07:54 -0800 | [diff] [blame] | 714 | rx_starttimer: |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 715 | bcm_rx_starttimer(op); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | /* |
| 719 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements |
| 720 | */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 721 | static struct bcm_op *bcm_find_op(struct list_head *ops, |
| 722 | struct bcm_msg_head *mh, int ifindex) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 723 | { |
| 724 | struct bcm_op *op; |
| 725 | |
| 726 | list_for_each_entry(op, ops, list) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 727 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
| 728 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 729 | return op; |
| 730 | } |
| 731 | |
| 732 | return NULL; |
| 733 | } |
| 734 | |
| 735 | static void bcm_remove_op(struct bcm_op *op) |
| 736 | { |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 737 | hrtimer_cancel(&op->timer); |
| 738 | hrtimer_cancel(&op->thrtimer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 739 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 740 | if (op->tsklet.func) |
| 741 | tasklet_kill(&op->tsklet); |
| 742 | |
| 743 | if (op->thrtsklet.func) |
| 744 | tasklet_kill(&op->thrtsklet); |
| 745 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 746 | if ((op->frames) && (op->frames != &op->sframe)) |
| 747 | kfree(op->frames); |
| 748 | |
| 749 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) |
| 750 | kfree(op->last_frames); |
| 751 | |
| 752 | kfree(op); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) |
| 756 | { |
| 757 | if (op->rx_reg_dev == dev) { |
| 758 | can_rx_unregister(dev, op->can_id, REGMASK(op->can_id), |
| 759 | bcm_rx_handler, op); |
| 760 | |
| 761 | /* mark as removed subscription */ |
| 762 | op->rx_reg_dev = NULL; |
| 763 | } else |
| 764 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " |
| 765 | "mismatch %p %p\n", op->rx_reg_dev, dev); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) |
| 770 | */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 771 | static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, |
| 772 | int ifindex) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 773 | { |
| 774 | struct bcm_op *op, *n; |
| 775 | |
| 776 | list_for_each_entry_safe(op, n, ops, list) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 777 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
| 778 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 779 | |
| 780 | /* |
| 781 | * Don't care if we're bound or not (due to netdev |
| 782 | * problems) can_rx_unregister() is always a save |
| 783 | * thing to do here. |
| 784 | */ |
| 785 | if (op->ifindex) { |
| 786 | /* |
| 787 | * Only remove subscriptions that had not |
| 788 | * been removed due to NETDEV_UNREGISTER |
| 789 | * in bcm_notifier() |
| 790 | */ |
| 791 | if (op->rx_reg_dev) { |
| 792 | struct net_device *dev; |
| 793 | |
| 794 | dev = dev_get_by_index(&init_net, |
| 795 | op->ifindex); |
| 796 | if (dev) { |
| 797 | bcm_rx_unreg(dev, op); |
| 798 | dev_put(dev); |
| 799 | } |
| 800 | } |
| 801 | } else |
| 802 | can_rx_unregister(NULL, op->can_id, |
| 803 | REGMASK(op->can_id), |
| 804 | bcm_rx_handler, op); |
| 805 | |
| 806 | list_del(&op->list); |
| 807 | bcm_remove_op(op); |
| 808 | return 1; /* done */ |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | return 0; /* not found */ |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) |
| 817 | */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 818 | static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh, |
| 819 | int ifindex) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 820 | { |
| 821 | struct bcm_op *op, *n; |
| 822 | |
| 823 | list_for_each_entry_safe(op, n, ops, list) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 824 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
| 825 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 826 | list_del(&op->list); |
| 827 | bcm_remove_op(op); |
| 828 | return 1; /* done */ |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | return 0; /* not found */ |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) |
| 837 | */ |
| 838 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, |
| 839 | int ifindex) |
| 840 | { |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 841 | struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 842 | |
| 843 | if (!op) |
| 844 | return -EINVAL; |
| 845 | |
| 846 | /* put current values into msg_head */ |
| 847 | msg_head->flags = op->flags; |
| 848 | msg_head->count = op->count; |
| 849 | msg_head->ival1 = op->ival1; |
| 850 | msg_head->ival2 = op->ival2; |
| 851 | msg_head->nframes = op->nframes; |
| 852 | |
| 853 | bcm_send_to_user(op, msg_head, op->frames, 0); |
| 854 | |
| 855 | return MHSIZ; |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) |
| 860 | */ |
| 861 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, |
| 862 | int ifindex, struct sock *sk) |
| 863 | { |
| 864 | struct bcm_sock *bo = bcm_sk(sk); |
| 865 | struct bcm_op *op; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 866 | struct canfd_frame *cf; |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 867 | unsigned int i; |
| 868 | int err; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 869 | |
| 870 | /* we need a real device to send frames */ |
| 871 | if (!ifindex) |
| 872 | return -ENODEV; |
| 873 | |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 874 | /* check nframes boundaries - we need at least one CAN frame */ |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 875 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 876 | return -EINVAL; |
| 877 | |
| 878 | /* check the given can_id */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 879 | op = bcm_find_op(&bo->tx_ops, msg_head, ifindex); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 880 | if (op) { |
| 881 | /* update existing BCM operation */ |
| 882 | |
| 883 | /* |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 884 | * Do we need more space for the CAN frames than currently |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 885 | * allocated? -> This is a _really_ unusual use-case and |
| 886 | * therefore (complexity / locking) it is not supported. |
| 887 | */ |
| 888 | if (msg_head->nframes > op->nframes) |
| 889 | return -E2BIG; |
| 890 | |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 891 | /* update CAN frames content */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 892 | for (i = 0; i < msg_head->nframes; i++) { |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 893 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 894 | cf = op->frames + op->cfsiz * i; |
| 895 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); |
| 896 | |
| 897 | if (op->flags & CAN_FD_FRAME) { |
| 898 | if (cf->len > 64) |
| 899 | err = -EINVAL; |
| 900 | } else { |
| 901 | if (cf->len > 8) |
| 902 | err = -EINVAL; |
| 903 | } |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 904 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 905 | if (err < 0) |
| 906 | return err; |
| 907 | |
| 908 | if (msg_head->flags & TX_CP_CAN_ID) { |
| 909 | /* copy can_id into frame */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 910 | cf->can_id = msg_head->can_id; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 911 | } |
| 912 | } |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 913 | op->flags = msg_head->flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 914 | |
| 915 | } else { |
| 916 | /* insert new BCM operation for the given can_id */ |
| 917 | |
| 918 | op = kzalloc(OPSIZ, GFP_KERNEL); |
| 919 | if (!op) |
| 920 | return -ENOMEM; |
| 921 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 922 | op->can_id = msg_head->can_id; |
| 923 | op->cfsiz = CFSIZ(msg_head->flags); |
| 924 | op->flags = msg_head->flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 925 | |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 926 | /* create array for CAN frames and copy the data */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 927 | if (msg_head->nframes > 1) { |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 928 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 929 | GFP_KERNEL); |
| 930 | if (!op->frames) { |
| 931 | kfree(op); |
| 932 | return -ENOMEM; |
| 933 | } |
| 934 | } else |
| 935 | op->frames = &op->sframe; |
| 936 | |
| 937 | for (i = 0; i < msg_head->nframes; i++) { |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 938 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 939 | cf = op->frames + op->cfsiz * i; |
| 940 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); |
| 941 | |
| 942 | if (op->flags & CAN_FD_FRAME) { |
| 943 | if (cf->len > 64) |
| 944 | err = -EINVAL; |
| 945 | } else { |
| 946 | if (cf->len > 8) |
| 947 | err = -EINVAL; |
| 948 | } |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 949 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 950 | if (err < 0) { |
| 951 | if (op->frames != &op->sframe) |
| 952 | kfree(op->frames); |
| 953 | kfree(op); |
| 954 | return err; |
| 955 | } |
| 956 | |
| 957 | if (msg_head->flags & TX_CP_CAN_ID) { |
| 958 | /* copy can_id into frame */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 959 | cf->can_id = msg_head->can_id; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 960 | } |
| 961 | } |
| 962 | |
| 963 | /* tx_ops never compare with previous received messages */ |
| 964 | op->last_frames = NULL; |
| 965 | |
| 966 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ |
| 967 | op->sk = sk; |
| 968 | op->ifindex = ifindex; |
| 969 | |
| 970 | /* initialize uninitialized (kzalloc) structure */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 971 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 972 | op->timer.function = bcm_tx_timeout_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 973 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 974 | /* initialize tasklet for tx countevent notification */ |
| 975 | tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet, |
| 976 | (unsigned long) op); |
| 977 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 978 | /* currently unused in tx_ops */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 979 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 980 | |
| 981 | /* add this bcm_op to the list of the tx_ops */ |
| 982 | list_add(&op->list, &bo->tx_ops); |
| 983 | |
| 984 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ |
| 985 | |
| 986 | if (op->nframes != msg_head->nframes) { |
| 987 | op->nframes = msg_head->nframes; |
| 988 | /* start multiple frame transmission with index 0 */ |
| 989 | op->currframe = 0; |
| 990 | } |
| 991 | |
| 992 | /* check flags */ |
| 993 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 994 | if (op->flags & TX_RESET_MULTI_IDX) { |
| 995 | /* start multiple frame transmission with index 0 */ |
| 996 | op->currframe = 0; |
| 997 | } |
| 998 | |
| 999 | if (op->flags & SETTIMER) { |
| 1000 | /* set timer values */ |
| 1001 | op->count = msg_head->count; |
| 1002 | op->ival1 = msg_head->ival1; |
| 1003 | op->ival2 = msg_head->ival2; |
Arnd Bergmann | ba61a8d | 2015-09-30 13:26:42 +0200 | [diff] [blame] | 1004 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
| 1005 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1006 | |
| 1007 | /* disable an active timer due to zero values? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1008 | if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64) |
| 1009 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1010 | } |
| 1011 | |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 1012 | if (op->flags & STARTTIMER) { |
| 1013 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1014 | /* spec: send CAN frame when starting timer */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1015 | op->flags |= TX_ANNOUNCE; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1016 | } |
| 1017 | |
Oliver Hartkopp | aabdcb0 | 2011-09-23 08:23:47 +0000 | [diff] [blame] | 1018 | if (op->flags & TX_ANNOUNCE) { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1019 | bcm_can_tx(op); |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 1020 | if (op->count) |
Oliver Hartkopp | aabdcb0 | 2011-09-23 08:23:47 +0000 | [diff] [blame] | 1021 | op->count--; |
| 1022 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1023 | |
Oliver Hartkopp | 12d0d0d | 2011-09-29 15:33:47 -0400 | [diff] [blame] | 1024 | if (op->flags & STARTTIMER) |
| 1025 | bcm_tx_start_timer(op); |
| 1026 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1027 | return msg_head->nframes * op->cfsiz + MHSIZ; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | /* |
| 1031 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) |
| 1032 | */ |
| 1033 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, |
| 1034 | int ifindex, struct sock *sk) |
| 1035 | { |
| 1036 | struct bcm_sock *bo = bcm_sk(sk); |
| 1037 | struct bcm_op *op; |
| 1038 | int do_rx_register; |
| 1039 | int err = 0; |
| 1040 | |
| 1041 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { |
| 1042 | /* be robust against wrong usage ... */ |
| 1043 | msg_head->flags |= RX_FILTER_ID; |
| 1044 | /* ignore trailing garbage */ |
| 1045 | msg_head->nframes = 0; |
| 1046 | } |
| 1047 | |
Oliver Hartkopp | 5b75c49 | 2010-08-11 16:12:35 -0700 | [diff] [blame] | 1048 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
| 1049 | if (msg_head->nframes > MAX_NFRAMES + 1) |
| 1050 | return -EINVAL; |
| 1051 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1052 | if ((msg_head->flags & RX_RTR_FRAME) && |
| 1053 | ((msg_head->nframes != 1) || |
| 1054 | (!(msg_head->can_id & CAN_RTR_FLAG)))) |
| 1055 | return -EINVAL; |
| 1056 | |
| 1057 | /* check the given can_id */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1058 | op = bcm_find_op(&bo->rx_ops, msg_head, ifindex); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1059 | if (op) { |
| 1060 | /* update existing BCM operation */ |
| 1061 | |
| 1062 | /* |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1063 | * Do we need more space for the CAN frames than currently |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1064 | * allocated? -> This is a _really_ unusual use-case and |
| 1065 | * therefore (complexity / locking) it is not supported. |
| 1066 | */ |
| 1067 | if (msg_head->nframes > op->nframes) |
| 1068 | return -E2BIG; |
| 1069 | |
| 1070 | if (msg_head->nframes) { |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1071 | /* update CAN frames content */ |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 1072 | err = memcpy_from_msg(op->frames, msg, |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1073 | msg_head->nframes * op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1074 | if (err < 0) |
| 1075 | return err; |
| 1076 | |
| 1077 | /* clear last_frames to indicate 'nothing received' */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1078 | memset(op->last_frames, 0, msg_head->nframes * op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1079 | } |
| 1080 | |
| 1081 | op->nframes = msg_head->nframes; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1082 | op->flags = msg_head->flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1083 | |
| 1084 | /* Only an update -> do not call can_rx_register() */ |
| 1085 | do_rx_register = 0; |
| 1086 | |
| 1087 | } else { |
| 1088 | /* insert new BCM operation for the given can_id */ |
| 1089 | op = kzalloc(OPSIZ, GFP_KERNEL); |
| 1090 | if (!op) |
| 1091 | return -ENOMEM; |
| 1092 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1093 | op->can_id = msg_head->can_id; |
| 1094 | op->nframes = msg_head->nframes; |
| 1095 | op->cfsiz = CFSIZ(msg_head->flags); |
| 1096 | op->flags = msg_head->flags; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1097 | |
| 1098 | if (msg_head->nframes > 1) { |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1099 | /* create array for CAN frames and copy the data */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1100 | op->frames = kmalloc(msg_head->nframes * op->cfsiz, |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1101 | GFP_KERNEL); |
| 1102 | if (!op->frames) { |
| 1103 | kfree(op); |
| 1104 | return -ENOMEM; |
| 1105 | } |
| 1106 | |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1107 | /* create and init array for received CAN frames */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1108 | op->last_frames = kzalloc(msg_head->nframes * op->cfsiz, |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1109 | GFP_KERNEL); |
| 1110 | if (!op->last_frames) { |
| 1111 | kfree(op->frames); |
| 1112 | kfree(op); |
| 1113 | return -ENOMEM; |
| 1114 | } |
| 1115 | |
| 1116 | } else { |
| 1117 | op->frames = &op->sframe; |
| 1118 | op->last_frames = &op->last_sframe; |
| 1119 | } |
| 1120 | |
| 1121 | if (msg_head->nframes) { |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 1122 | err = memcpy_from_msg(op->frames, msg, |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1123 | msg_head->nframes * op->cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1124 | if (err < 0) { |
| 1125 | if (op->frames != &op->sframe) |
| 1126 | kfree(op->frames); |
| 1127 | if (op->last_frames != &op->last_sframe) |
| 1128 | kfree(op->last_frames); |
| 1129 | kfree(op); |
| 1130 | return err; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ |
| 1135 | op->sk = sk; |
| 1136 | op->ifindex = ifindex; |
| 1137 | |
Oliver Hartkopp | 81b4011 | 2012-11-26 22:24:23 +0100 | [diff] [blame] | 1138 | /* ifindex for timeout events w/o previous frame reception */ |
| 1139 | op->rx_ifindex = ifindex; |
| 1140 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1141 | /* initialize uninitialized (kzalloc) structure */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1142 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1143 | op->timer.function = bcm_rx_timeout_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1144 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1145 | /* initialize tasklet for rx timeout notification */ |
| 1146 | tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet, |
| 1147 | (unsigned long) op); |
| 1148 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1149 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 1150 | op->thrtimer.function = bcm_rx_thr_handler; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1151 | |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1152 | /* initialize tasklet for rx throttle handling */ |
| 1153 | tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet, |
| 1154 | (unsigned long) op); |
| 1155 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1156 | /* add this bcm_op to the list of the rx_ops */ |
| 1157 | list_add(&op->list, &bo->rx_ops); |
| 1158 | |
| 1159 | /* call can_rx_register() */ |
| 1160 | do_rx_register = 1; |
| 1161 | |
| 1162 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ |
| 1163 | |
| 1164 | /* check flags */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1165 | |
| 1166 | if (op->flags & RX_RTR_FRAME) { |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 1167 | struct canfd_frame *frame0 = op->frames; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1168 | |
| 1169 | /* no timers in RTR-mode */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1170 | hrtimer_cancel(&op->thrtimer); |
| 1171 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1172 | |
| 1173 | /* |
| 1174 | * funny feature in RX(!)_SETUP only for RTR-mode: |
| 1175 | * copy can_id into frame BUT without RTR-flag to |
| 1176 | * prevent a full-load-loopback-test ... ;-] |
| 1177 | */ |
| 1178 | if ((op->flags & TX_CP_CAN_ID) || |
Oliver Hartkopp | 5499a6b | 2016-11-23 14:33:25 +0100 | [diff] [blame] | 1179 | (frame0->can_id == op->can_id)) |
| 1180 | frame0->can_id = op->can_id & ~CAN_RTR_FLAG; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1181 | |
| 1182 | } else { |
| 1183 | if (op->flags & SETTIMER) { |
| 1184 | |
| 1185 | /* set timer value */ |
| 1186 | op->ival1 = msg_head->ival1; |
| 1187 | op->ival2 = msg_head->ival2; |
Arnd Bergmann | ba61a8d | 2015-09-30 13:26:42 +0200 | [diff] [blame] | 1188 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
| 1189 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1190 | |
| 1191 | /* disable an active timer due to zero value? */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1192 | if (!op->kt_ival1.tv64) |
| 1193 | hrtimer_cancel(&op->timer); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1194 | |
| 1195 | /* |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1196 | * In any case cancel the throttle timer, flush |
| 1197 | * potentially blocked msgs and reset throttle handling |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1198 | */ |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1199 | op->kt_lastmsg = ktime_set(0, 0); |
| 1200 | hrtimer_cancel(&op->thrtimer); |
Oliver Hartkopp | 6e5c172 | 2009-01-04 17:31:18 -0800 | [diff] [blame] | 1201 | bcm_rx_thr_flush(op, 1); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1202 | } |
| 1203 | |
Oliver Hartkopp | 73e87e0 | 2008-04-15 19:29:14 -0700 | [diff] [blame] | 1204 | if ((op->flags & STARTTIMER) && op->kt_ival1.tv64) |
| 1205 | hrtimer_start(&op->timer, op->kt_ival1, |
| 1206 | HRTIMER_MODE_REL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1207 | } |
| 1208 | |
| 1209 | /* now we can register for can_ids, if we added a new bcm_op */ |
| 1210 | if (do_rx_register) { |
| 1211 | if (ifindex) { |
| 1212 | struct net_device *dev; |
| 1213 | |
| 1214 | dev = dev_get_by_index(&init_net, ifindex); |
| 1215 | if (dev) { |
| 1216 | err = can_rx_register(dev, op->can_id, |
| 1217 | REGMASK(op->can_id), |
| 1218 | bcm_rx_handler, op, |
| 1219 | "bcm"); |
| 1220 | |
| 1221 | op->rx_reg_dev = dev; |
| 1222 | dev_put(dev); |
| 1223 | } |
| 1224 | |
| 1225 | } else |
| 1226 | err = can_rx_register(NULL, op->can_id, |
| 1227 | REGMASK(op->can_id), |
| 1228 | bcm_rx_handler, op, "bcm"); |
| 1229 | if (err) { |
| 1230 | /* this bcm rx op is broken -> remove it */ |
| 1231 | list_del(&op->list); |
| 1232 | bcm_remove_op(op); |
| 1233 | return err; |
| 1234 | } |
| 1235 | } |
| 1236 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1237 | return msg_head->nframes * op->cfsiz + MHSIZ; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1238 | } |
| 1239 | |
| 1240 | /* |
| 1241 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) |
| 1242 | */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1243 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, |
| 1244 | int cfsiz) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1245 | { |
| 1246 | struct sk_buff *skb; |
| 1247 | struct net_device *dev; |
| 1248 | int err; |
| 1249 | |
| 1250 | /* we need a real device to send frames */ |
| 1251 | if (!ifindex) |
| 1252 | return -ENODEV; |
| 1253 | |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1254 | skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1255 | if (!skb) |
| 1256 | return -ENOMEM; |
| 1257 | |
Oliver Hartkopp | 2bf3440 | 2013-01-28 08:33:33 +0000 | [diff] [blame] | 1258 | can_skb_reserve(skb); |
Oliver Hartkopp | 156c2bb | 2013-01-17 18:43:39 +0100 | [diff] [blame] | 1259 | |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1260 | err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1261 | if (err < 0) { |
| 1262 | kfree_skb(skb); |
| 1263 | return err; |
| 1264 | } |
| 1265 | |
| 1266 | dev = dev_get_by_index(&init_net, ifindex); |
| 1267 | if (!dev) { |
| 1268 | kfree_skb(skb); |
| 1269 | return -ENODEV; |
| 1270 | } |
| 1271 | |
Oliver Hartkopp | 2bf3440 | 2013-01-28 08:33:33 +0000 | [diff] [blame] | 1272 | can_skb_prv(skb)->ifindex = dev->ifindex; |
Oliver Hartkopp | d3b58c4 | 2015-06-26 11:58:19 +0200 | [diff] [blame] | 1273 | can_skb_prv(skb)->skbcnt = 0; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1274 | skb->dev = dev; |
Oliver Hartkopp | 0ae89be | 2014-01-30 10:11:28 +0100 | [diff] [blame] | 1275 | can_skb_set_owner(skb, sk); |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1276 | err = can_send(skb, 1); /* send with loopback */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1277 | dev_put(dev); |
| 1278 | |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1279 | if (err) |
| 1280 | return err; |
| 1281 | |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1282 | return cfsiz + MHSIZ; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1283 | } |
| 1284 | |
| 1285 | /* |
| 1286 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace |
| 1287 | */ |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1288 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1289 | { |
| 1290 | struct sock *sk = sock->sk; |
| 1291 | struct bcm_sock *bo = bcm_sk(sk); |
| 1292 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ |
| 1293 | struct bcm_msg_head msg_head; |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1294 | int cfsiz; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1295 | int ret; /* read bytes or error codes as return value */ |
| 1296 | |
| 1297 | if (!bo->bound) |
| 1298 | return -ENOTCONN; |
| 1299 | |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1300 | /* check for valid message length from userspace */ |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1301 | if (size < MHSIZ) |
| 1302 | return -EINVAL; |
| 1303 | |
| 1304 | /* read message head information */ |
| 1305 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); |
| 1306 | if (ret < 0) |
| 1307 | return ret; |
| 1308 | |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1309 | cfsiz = CFSIZ(msg_head.flags); |
| 1310 | if ((size - MHSIZ) % cfsiz) |
Oliver Hartkopp | 7f2d38e | 2008-07-05 23:38:43 -0700 | [diff] [blame] | 1311 | return -EINVAL; |
| 1312 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1313 | /* check for alternative ifindex for this bcm_op */ |
| 1314 | |
| 1315 | if (!ifindex && msg->msg_name) { |
| 1316 | /* no bound device as default => check msg_name */ |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1317 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1318 | |
Kurt Van Dijck | 5e50732 | 2011-01-15 20:56:42 -0800 | [diff] [blame] | 1319 | if (msg->msg_namelen < sizeof(*addr)) |
| 1320 | return -EINVAL; |
| 1321 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1322 | if (addr->can_family != AF_CAN) |
| 1323 | return -EINVAL; |
| 1324 | |
| 1325 | /* ifindex from sendto() */ |
| 1326 | ifindex = addr->can_ifindex; |
| 1327 | |
| 1328 | if (ifindex) { |
| 1329 | struct net_device *dev; |
| 1330 | |
| 1331 | dev = dev_get_by_index(&init_net, ifindex); |
| 1332 | if (!dev) |
| 1333 | return -ENODEV; |
| 1334 | |
| 1335 | if (dev->type != ARPHRD_CAN) { |
| 1336 | dev_put(dev); |
| 1337 | return -ENODEV; |
| 1338 | } |
| 1339 | |
| 1340 | dev_put(dev); |
| 1341 | } |
| 1342 | } |
| 1343 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1344 | lock_sock(sk); |
| 1345 | |
| 1346 | switch (msg_head.opcode) { |
| 1347 | |
| 1348 | case TX_SETUP: |
| 1349 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); |
| 1350 | break; |
| 1351 | |
| 1352 | case RX_SETUP: |
| 1353 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); |
| 1354 | break; |
| 1355 | |
| 1356 | case TX_DELETE: |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1357 | if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1358 | ret = MHSIZ; |
| 1359 | else |
| 1360 | ret = -EINVAL; |
| 1361 | break; |
| 1362 | |
| 1363 | case RX_DELETE: |
Oliver Hartkopp | 2b5f5f5 | 2016-06-17 15:35:26 +0200 | [diff] [blame] | 1364 | if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1365 | ret = MHSIZ; |
| 1366 | else |
| 1367 | ret = -EINVAL; |
| 1368 | break; |
| 1369 | |
| 1370 | case TX_READ: |
| 1371 | /* reuse msg_head for the reply to TX_READ */ |
| 1372 | msg_head.opcode = TX_STATUS; |
| 1373 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); |
| 1374 | break; |
| 1375 | |
| 1376 | case RX_READ: |
| 1377 | /* reuse msg_head for the reply to RX_READ */ |
| 1378 | msg_head.opcode = RX_STATUS; |
| 1379 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); |
| 1380 | break; |
| 1381 | |
| 1382 | case TX_SEND: |
Oliver Hartkopp | 72c8a89 | 2016-06-17 15:35:25 +0200 | [diff] [blame] | 1383 | /* we need exactly one CAN frame behind the msg head */ |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1384 | if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1385 | ret = -EINVAL; |
| 1386 | else |
Oliver Hartkopp | 6f3b911 | 2016-06-17 15:35:27 +0200 | [diff] [blame] | 1387 | ret = bcm_tx_send(msg, ifindex, sk, cfsiz); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1388 | break; |
| 1389 | |
| 1390 | default: |
| 1391 | ret = -EINVAL; |
| 1392 | break; |
| 1393 | } |
| 1394 | |
| 1395 | release_sock(sk); |
| 1396 | |
| 1397 | return ret; |
| 1398 | } |
| 1399 | |
| 1400 | /* |
| 1401 | * notification handler for netdevice status changes |
| 1402 | */ |
| 1403 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1404 | void *ptr) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1405 | { |
Jiri Pirko | 351638e | 2013-05-28 01:30:21 +0000 | [diff] [blame] | 1406 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1407 | struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier); |
| 1408 | struct sock *sk = &bo->sk; |
| 1409 | struct bcm_op *op; |
| 1410 | int notify_enodev = 0; |
| 1411 | |
YOSHIFUJI Hideaki | 721499e | 2008-07-19 22:34:43 -0700 | [diff] [blame] | 1412 | if (!net_eq(dev_net(dev), &init_net)) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1413 | return NOTIFY_DONE; |
| 1414 | |
| 1415 | if (dev->type != ARPHRD_CAN) |
| 1416 | return NOTIFY_DONE; |
| 1417 | |
| 1418 | switch (msg) { |
| 1419 | |
| 1420 | case NETDEV_UNREGISTER: |
| 1421 | lock_sock(sk); |
| 1422 | |
| 1423 | /* remove device specific receive entries */ |
| 1424 | list_for_each_entry(op, &bo->rx_ops, list) |
| 1425 | if (op->rx_reg_dev == dev) |
| 1426 | bcm_rx_unreg(dev, op); |
| 1427 | |
| 1428 | /* remove device reference, if this is our bound device */ |
| 1429 | if (bo->bound && bo->ifindex == dev->ifindex) { |
| 1430 | bo->bound = 0; |
| 1431 | bo->ifindex = 0; |
| 1432 | notify_enodev = 1; |
| 1433 | } |
| 1434 | |
| 1435 | release_sock(sk); |
| 1436 | |
| 1437 | if (notify_enodev) { |
| 1438 | sk->sk_err = ENODEV; |
| 1439 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1440 | sk->sk_error_report(sk); |
| 1441 | } |
| 1442 | break; |
| 1443 | |
| 1444 | case NETDEV_DOWN: |
| 1445 | if (bo->bound && bo->ifindex == dev->ifindex) { |
| 1446 | sk->sk_err = ENETDOWN; |
| 1447 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1448 | sk->sk_error_report(sk); |
| 1449 | } |
| 1450 | } |
| 1451 | |
| 1452 | return NOTIFY_DONE; |
| 1453 | } |
| 1454 | |
| 1455 | /* |
| 1456 | * initial settings for all BCM sockets to be set at socket creation time |
| 1457 | */ |
| 1458 | static int bcm_init(struct sock *sk) |
| 1459 | { |
| 1460 | struct bcm_sock *bo = bcm_sk(sk); |
| 1461 | |
| 1462 | bo->bound = 0; |
| 1463 | bo->ifindex = 0; |
| 1464 | bo->dropped_usr_msgs = 0; |
| 1465 | bo->bcm_proc_read = NULL; |
| 1466 | |
| 1467 | INIT_LIST_HEAD(&bo->tx_ops); |
| 1468 | INIT_LIST_HEAD(&bo->rx_ops); |
| 1469 | |
| 1470 | /* set notifier */ |
| 1471 | bo->notifier.notifier_call = bcm_notifier; |
| 1472 | |
| 1473 | register_netdevice_notifier(&bo->notifier); |
| 1474 | |
| 1475 | return 0; |
| 1476 | } |
| 1477 | |
| 1478 | /* |
| 1479 | * standard socket functions |
| 1480 | */ |
| 1481 | static int bcm_release(struct socket *sock) |
| 1482 | { |
| 1483 | struct sock *sk = sock->sk; |
Dave Jones | c6914a6 | 2011-04-19 20:36:59 -0700 | [diff] [blame] | 1484 | struct bcm_sock *bo; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1485 | struct bcm_op *op, *next; |
| 1486 | |
Dave Jones | c6914a6 | 2011-04-19 20:36:59 -0700 | [diff] [blame] | 1487 | if (sk == NULL) |
| 1488 | return 0; |
| 1489 | |
| 1490 | bo = bcm_sk(sk); |
| 1491 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1492 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
| 1493 | |
| 1494 | unregister_netdevice_notifier(&bo->notifier); |
| 1495 | |
| 1496 | lock_sock(sk); |
| 1497 | |
| 1498 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) |
| 1499 | bcm_remove_op(op); |
| 1500 | |
| 1501 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { |
| 1502 | /* |
| 1503 | * Don't care if we're bound or not (due to netdev problems) |
| 1504 | * can_rx_unregister() is always a save thing to do here. |
| 1505 | */ |
| 1506 | if (op->ifindex) { |
| 1507 | /* |
| 1508 | * Only remove subscriptions that had not |
| 1509 | * been removed due to NETDEV_UNREGISTER |
| 1510 | * in bcm_notifier() |
| 1511 | */ |
| 1512 | if (op->rx_reg_dev) { |
| 1513 | struct net_device *dev; |
| 1514 | |
| 1515 | dev = dev_get_by_index(&init_net, op->ifindex); |
| 1516 | if (dev) { |
| 1517 | bcm_rx_unreg(dev, op); |
| 1518 | dev_put(dev); |
| 1519 | } |
| 1520 | } |
| 1521 | } else |
| 1522 | can_rx_unregister(NULL, op->can_id, |
| 1523 | REGMASK(op->can_id), |
| 1524 | bcm_rx_handler, op); |
| 1525 | |
| 1526 | bcm_remove_op(op); |
| 1527 | } |
| 1528 | |
| 1529 | /* remove procfs entry */ |
| 1530 | if (proc_dir && bo->bcm_proc_read) |
| 1531 | remove_proc_entry(bo->procname, proc_dir); |
| 1532 | |
| 1533 | /* remove device reference */ |
| 1534 | if (bo->bound) { |
| 1535 | bo->bound = 0; |
| 1536 | bo->ifindex = 0; |
| 1537 | } |
| 1538 | |
Lothar Waßmann | f7e5cc0 | 2009-07-14 23:10:21 +0000 | [diff] [blame] | 1539 | sock_orphan(sk); |
| 1540 | sock->sk = NULL; |
| 1541 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1542 | release_sock(sk); |
| 1543 | sock_put(sk); |
| 1544 | |
| 1545 | return 0; |
| 1546 | } |
| 1547 | |
| 1548 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, |
| 1549 | int flags) |
| 1550 | { |
| 1551 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; |
| 1552 | struct sock *sk = sock->sk; |
| 1553 | struct bcm_sock *bo = bcm_sk(sk); |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1554 | int ret = 0; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1555 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 1556 | if (len < sizeof(*addr)) |
| 1557 | return -EINVAL; |
| 1558 | |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1559 | lock_sock(sk); |
| 1560 | |
| 1561 | if (bo->bound) { |
| 1562 | ret = -EISCONN; |
| 1563 | goto fail; |
| 1564 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1565 | |
| 1566 | /* bind a device to this socket */ |
| 1567 | if (addr->can_ifindex) { |
| 1568 | struct net_device *dev; |
| 1569 | |
| 1570 | dev = dev_get_by_index(&init_net, addr->can_ifindex); |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1571 | if (!dev) { |
| 1572 | ret = -ENODEV; |
| 1573 | goto fail; |
| 1574 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1575 | if (dev->type != ARPHRD_CAN) { |
| 1576 | dev_put(dev); |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1577 | ret = -ENODEV; |
| 1578 | goto fail; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1579 | } |
| 1580 | |
| 1581 | bo->ifindex = dev->ifindex; |
| 1582 | dev_put(dev); |
| 1583 | |
| 1584 | } else { |
| 1585 | /* no interface reference for ifindex = 0 ('any' CAN device) */ |
| 1586 | bo->ifindex = 0; |
| 1587 | } |
| 1588 | |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1589 | if (proc_dir) { |
| 1590 | /* unique socket address as filename */ |
Dan Rosenberg | 9f260e0 | 2010-12-26 06:54:53 +0000 | [diff] [blame] | 1591 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
Alexey Dobriyan | ea00b8e | 2009-08-28 09:57:21 +0000 | [diff] [blame] | 1592 | bo->bcm_proc_read = proc_create_data(bo->procname, 0644, |
| 1593 | proc_dir, |
| 1594 | &bcm_proc_fops, sk); |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1595 | if (!bo->bcm_proc_read) { |
| 1596 | ret = -ENOMEM; |
| 1597 | goto fail; |
| 1598 | } |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1599 | } |
| 1600 | |
Oliver Hartkopp | deb507f | 2016-10-24 21:11:26 +0200 | [diff] [blame] | 1601 | bo->bound = 1; |
| 1602 | |
| 1603 | fail: |
| 1604 | release_sock(sk); |
| 1605 | |
| 1606 | return ret; |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1607 | } |
| 1608 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1609 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 1610 | int flags) |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1611 | { |
| 1612 | struct sock *sk = sock->sk; |
| 1613 | struct sk_buff *skb; |
| 1614 | int error = 0; |
| 1615 | int noblock; |
| 1616 | int err; |
| 1617 | |
| 1618 | noblock = flags & MSG_DONTWAIT; |
| 1619 | flags &= ~MSG_DONTWAIT; |
| 1620 | skb = skb_recv_datagram(sk, flags, noblock, &error); |
| 1621 | if (!skb) |
| 1622 | return error; |
| 1623 | |
| 1624 | if (skb->len < size) |
| 1625 | size = skb->len; |
| 1626 | |
Al Viro | 7eab8d9 | 2014-04-06 21:51:23 -0400 | [diff] [blame] | 1627 | err = memcpy_to_msg(msg, skb->data, size); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1628 | if (err < 0) { |
| 1629 | skb_free_datagram(sk, skb); |
| 1630 | return err; |
| 1631 | } |
| 1632 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1633 | sock_recv_ts_and_drops(msg, sk, skb); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1634 | |
| 1635 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1636 | __sockaddr_check_size(sizeof(struct sockaddr_can)); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1637 | msg->msg_namelen = sizeof(struct sockaddr_can); |
| 1638 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
| 1639 | } |
| 1640 | |
| 1641 | skb_free_datagram(sk, skb); |
| 1642 | |
| 1643 | return size; |
| 1644 | } |
| 1645 | |
Oliver Hartkopp | 53914b6 | 2011-03-22 08:27:25 +0000 | [diff] [blame] | 1646 | static const struct proto_ops bcm_ops = { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1647 | .family = PF_CAN, |
| 1648 | .release = bcm_release, |
| 1649 | .bind = sock_no_bind, |
| 1650 | .connect = bcm_connect, |
| 1651 | .socketpair = sock_no_socketpair, |
| 1652 | .accept = sock_no_accept, |
| 1653 | .getname = sock_no_getname, |
| 1654 | .poll = datagram_poll, |
Oliver Hartkopp | 53914b6 | 2011-03-22 08:27:25 +0000 | [diff] [blame] | 1655 | .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */ |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1656 | .listen = sock_no_listen, |
| 1657 | .shutdown = sock_no_shutdown, |
| 1658 | .setsockopt = sock_no_setsockopt, |
| 1659 | .getsockopt = sock_no_getsockopt, |
| 1660 | .sendmsg = bcm_sendmsg, |
| 1661 | .recvmsg = bcm_recvmsg, |
| 1662 | .mmap = sock_no_mmap, |
| 1663 | .sendpage = sock_no_sendpage, |
| 1664 | }; |
| 1665 | |
| 1666 | static struct proto bcm_proto __read_mostly = { |
| 1667 | .name = "CAN_BCM", |
| 1668 | .owner = THIS_MODULE, |
| 1669 | .obj_size = sizeof(struct bcm_sock), |
| 1670 | .init = bcm_init, |
| 1671 | }; |
| 1672 | |
Kurt Van Dijck | 1650629 | 2011-05-03 18:40:57 +0000 | [diff] [blame] | 1673 | static const struct can_proto bcm_can_proto = { |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1674 | .type = SOCK_DGRAM, |
| 1675 | .protocol = CAN_BCM, |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1676 | .ops = &bcm_ops, |
| 1677 | .prot = &bcm_proto, |
| 1678 | }; |
| 1679 | |
| 1680 | static int __init bcm_module_init(void) |
| 1681 | { |
| 1682 | int err; |
| 1683 | |
Jeremiah Mahler | b111b78 | 2014-11-21 23:42:35 -0800 | [diff] [blame] | 1684 | pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n"); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1685 | |
| 1686 | err = can_proto_register(&bcm_can_proto); |
| 1687 | if (err < 0) { |
| 1688 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); |
| 1689 | return err; |
| 1690 | } |
| 1691 | |
| 1692 | /* create /proc/net/can-bcm directory */ |
| 1693 | proc_dir = proc_mkdir("can-bcm", init_net.proc_net); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1694 | return 0; |
| 1695 | } |
| 1696 | |
| 1697 | static void __exit bcm_module_exit(void) |
| 1698 | { |
| 1699 | can_proto_unregister(&bcm_can_proto); |
| 1700 | |
| 1701 | if (proc_dir) |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 1702 | remove_proc_entry("can-bcm", init_net.proc_net); |
Oliver Hartkopp | ffd980f | 2007-11-16 15:53:52 -0800 | [diff] [blame] | 1703 | } |
| 1704 | |
| 1705 | module_init(bcm_module_init); |
| 1706 | module_exit(bcm_module_exit); |