blob: 8e999ffdf28be91fb444b53cef62a34b582f6ba3 [file] [log] [blame]
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001/*
2 * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content
3 *
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02004 * Copyright (c) 2002-2016 Volkswagen Group Electronic Research
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08005 * 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 Hartkoppffd980f2007-11-16 15:53:52 -080040 */
41
42#include <linux/module.h>
43#include <linux/init.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +000044#include <linux/interrupt.h>
Oliver Hartkopp73e87e02008-04-15 19:29:14 -070045#include <linux/hrtimer.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080046#include <linux/list.h>
47#include <linux/proc_fs.h>
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +000048#include <linux/seq_file.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080049#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 Hartkopp156c2bb2013-01-17 18:43:39 +010057#include <linux/can/skb.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080058#include <linux/can/bcm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090059#include <linux/slab.h>
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080060#include <net/sock.h>
61#include <net/net_namespace.h>
62
Oliver Hartkopp5b75c492010-08-11 16:12:35 -070063/*
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 Hartkopp6f3b9112016-06-17 15:35:27 +020070/* use of last_frames[index].flags */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080071#define RX_RECV 0x40 /* received data for this element */
72#define RX_THR 0x80 /* element not been sent due to throttle feature */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +020073#define BCM_CAN_FLAGS_MASK 0x3F /* to clean private flags after usage */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080074
75/* get best masking value for can_rx_register() for a given single can_id */
Oliver Hartkoppd253eee2008-12-03 15:52:35 -080076#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 Hartkoppffd980f2007-11-16 15:53:52 -080079
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +020080#define CAN_BCM_VERSION "20160617"
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080081
82MODULE_DESCRIPTION("PF_CAN broadcast manager protocol");
83MODULE_LICENSE("Dual BSD/GPL");
84MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
Lothar Waßmannb13bb2e2009-07-14 23:12:25 +000085MODULE_ALIAS("can-proto-2");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080086
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +020087/*
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 */
92static inline u64 get_u64(const struct canfd_frame *cp, int offset)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080093{
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +020094 return *(u64 *)(cp->data + offset);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -080095}
96
97struct bcm_op {
98 struct list_head list;
99 int ifindex;
100 canid_t can_id;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700101 u32 flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800102 unsigned long frames_abs, frames_filtered;
Arnd Bergmannba61a8d2015-09-30 13:26:42 +0200103 struct bcm_timeval ival1, ival2;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700104 struct hrtimer timer, thrtimer;
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800105 struct tasklet_struct tsklet, thrtsklet;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700106 ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800107 int rx_ifindex;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200108 int cfsiz;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700109 u32 count;
110 u32 nframes;
111 u32 currframe;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200112 struct canfd_frame *frames;
113 struct canfd_frame *last_frames;
114 struct canfd_frame sframe;
115 struct canfd_frame last_sframe;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800116 struct sock *sk;
117 struct net_device *rx_reg_dev;
118};
119
120static struct proc_dir_entry *proc_dir;
121
122struct bcm_sock {
123 struct sock sk;
124 int bound;
125 int ifindex;
126 struct notifier_block notifier;
127 struct list_head rx_ops;
128 struct list_head tx_ops;
129 unsigned long dropped_usr_msgs;
130 struct proc_dir_entry *bcm_proc_read;
Dan Rosenberg9f260e02010-12-26 06:54:53 +0000131 char procname [32]; /* inode number in decimal with \0 */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800132};
133
134static inline struct bcm_sock *bcm_sk(const struct sock *sk)
135{
136 return (struct bcm_sock *)sk;
137}
138
Arnd Bergmannba61a8d2015-09-30 13:26:42 +0200139static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv)
140{
141 return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);
142}
143
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200144#define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800145#define OPSIZ sizeof(struct bcm_op)
146#define MHSIZ sizeof(struct bcm_msg_head)
147
148/*
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800149 * procfs functions
150 */
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000151static char *bcm_proc_getifname(char *result, int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800152{
153 struct net_device *dev;
154
155 if (!ifindex)
156 return "any";
157
stephen hemmingerff879eb2009-11-10 07:54:56 +0000158 rcu_read_lock();
159 dev = dev_get_by_index_rcu(&init_net, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800160 if (dev)
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000161 strcpy(result, dev->name);
162 else
163 strcpy(result, "???");
stephen hemmingerff879eb2009-11-10 07:54:56 +0000164 rcu_read_unlock();
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800165
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000166 return result;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800167}
168
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000169static int bcm_proc_show(struct seq_file *m, void *v)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800170{
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000171 char ifname[IFNAMSIZ];
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000172 struct sock *sk = (struct sock *)m->private;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800173 struct bcm_sock *bo = bcm_sk(sk);
174 struct bcm_op *op;
175
Dan Rosenberg71338aa2011-05-23 12:17:35 +0000176 seq_printf(m, ">>> socket %pK", sk->sk_socket);
177 seq_printf(m, " / sk %pK", sk);
178 seq_printf(m, " / bo %pK", bo);
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000179 seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs);
Eric Dumazet6755aeb2009-11-06 00:23:01 +0000180 seq_printf(m, " / bound %s", bcm_proc_getifname(ifname, bo->ifindex));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000181 seq_printf(m, " <<<\n");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800182
183 list_for_each_entry(op, &bo->rx_ops, list) {
184
185 unsigned long reduction;
186
187 /* print only active entries & prevent division by zero */
188 if (!op->frames_abs)
189 continue;
190
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200191 seq_printf(m, "rx_op: %03X %-5s ", op->can_id,
192 bcm_proc_getifname(ifname, op->ifindex));
193
194 if (op->flags & CAN_FD_FRAME)
195 seq_printf(m, "(%u)", op->nframes);
196 else
197 seq_printf(m, "[%u]", op->nframes);
198
199 seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' ');
200
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700201 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000202 seq_printf(m, "timeo=%lld ",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200203 (long long)ktime_to_us(op->kt_ival1));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800204
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700205 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000206 seq_printf(m, "thr=%lld ",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200207 (long long)ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800208
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000209 seq_printf(m, "# recv %ld (%ld) => reduction: ",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200210 op->frames_filtered, op->frames_abs);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800211
212 reduction = 100 - (op->frames_filtered * 100) / op->frames_abs;
213
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000214 seq_printf(m, "%s%ld%%\n",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200215 (reduction == 100) ? "near " : "", reduction);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800216 }
217
218 list_for_each_entry(op, &bo->tx_ops, list) {
219
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200220 seq_printf(m, "tx_op: %03X %s ", op->can_id,
221 bcm_proc_getifname(ifname, op->ifindex));
222
223 if (op->flags & CAN_FD_FRAME)
224 seq_printf(m, "(%u) ", op->nframes);
225 else
226 seq_printf(m, "[%u] ", op->nframes);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800227
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700228 if (op->kt_ival1.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000229 seq_printf(m, "t1=%lld ",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200230 (long long)ktime_to_us(op->kt_ival1));
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700231
232 if (op->kt_ival2.tv64)
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000233 seq_printf(m, "t2=%lld ",
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200234 (long long)ktime_to_us(op->kt_ival2));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800235
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000236 seq_printf(m, "# sent %ld\n", op->frames_abs);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800237 }
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000238 seq_putc(m, '\n');
239 return 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800240}
241
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000242static int bcm_proc_open(struct inode *inode, struct file *file)
243{
Al Virod9dda782013-03-31 18:16:14 -0400244 return single_open(file, bcm_proc_show, PDE_DATA(inode));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +0000245}
246
247static const struct file_operations bcm_proc_fops = {
248 .owner = THIS_MODULE,
249 .open = bcm_proc_open,
250 .read = seq_read,
251 .llseek = seq_lseek,
252 .release = single_release,
253};
254
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800255/*
256 * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface
257 * of the given bcm tx op
258 */
259static void bcm_can_tx(struct bcm_op *op)
260{
261 struct sk_buff *skb;
262 struct net_device *dev;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200263 struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800264
265 /* no target device? => exit */
266 if (!op->ifindex)
267 return;
268
269 dev = dev_get_by_index(&init_net, op->ifindex);
270 if (!dev) {
271 /* RFC: should this bcm_op remove itself here? */
272 return;
273 }
274
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200275 skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any());
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800276 if (!skb)
277 goto out;
278
Oliver Hartkopp2bf34402013-01-28 08:33:33 +0000279 can_skb_reserve(skb);
280 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +0200281 can_skb_prv(skb)->skbcnt = 0;
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +0100282
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200283 memcpy(skb_put(skb, op->cfsiz), cf, op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800284
285 /* send with loopback */
286 skb->dev = dev;
Oliver Hartkopp0ae89be2014-01-30 10:11:28 +0100287 can_skb_set_owner(skb, op->sk);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800288 can_send(skb, 1);
289
290 /* update statistics */
291 op->currframe++;
292 op->frames_abs++;
293
294 /* reached last frame? */
295 if (op->currframe >= op->nframes)
296 op->currframe = 0;
Oliver Hartkopp95acb492016-06-17 15:35:24 +0200297out:
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800298 dev_put(dev);
299}
300
301/*
302 * bcm_send_to_user - send a BCM message to the userspace
303 * (consisting of bcm_msg_head + x CAN frames)
304 */
305static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200306 struct canfd_frame *frames, int has_timestamp)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800307{
308 struct sk_buff *skb;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200309 struct canfd_frame *firstframe;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800310 struct sockaddr_can *addr;
311 struct sock *sk = op->sk;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200312 unsigned int datalen = head->nframes * op->cfsiz;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800313 int err;
314
315 skb = alloc_skb(sizeof(*head) + datalen, gfp_any());
316 if (!skb)
317 return;
318
319 memcpy(skb_put(skb, sizeof(*head)), head, sizeof(*head));
320
321 if (head->nframes) {
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200322 /* CAN frames starting here */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200323 firstframe = (struct canfd_frame *)skb_tail_pointer(skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800324
325 memcpy(skb_put(skb, datalen), frames, datalen);
326
327 /*
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200328 * the BCM uses the flags-element of the canfd_frame
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800329 * structure for internal purposes. This is only
330 * relevant for updates that are generated by the
331 * BCM, where nframes is 1
332 */
333 if (head->nframes == 1)
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200334 firstframe->flags &= BCM_CAN_FLAGS_MASK;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800335 }
336
337 if (has_timestamp) {
338 /* restore rx timestamp */
339 skb->tstamp = op->rx_stamp;
340 }
341
342 /*
343 * Put the datagram to the queue so that bcm_recvmsg() can
344 * get it from there. We need to pass the interface index to
345 * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb
346 * containing the interface index.
347 */
348
Eyal Birgerb4772ef2015-03-01 14:58:29 +0200349 sock_skb_cb_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800350 addr = (struct sockaddr_can *)skb->cb;
351 memset(addr, 0, sizeof(*addr));
352 addr->can_family = AF_CAN;
353 addr->can_ifindex = op->rx_ifindex;
354
355 err = sock_queue_rcv_skb(sk, skb);
356 if (err < 0) {
357 struct bcm_sock *bo = bcm_sk(sk);
358
359 kfree_skb(skb);
360 /* don't care about overflows in this statistic */
361 bo->dropped_usr_msgs++;
362 }
363}
364
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400365static void bcm_tx_start_timer(struct bcm_op *op)
366{
367 if (op->kt_ival1.tv64 && op->count)
368 hrtimer_start(&op->timer,
369 ktime_add(ktime_get(), op->kt_ival1),
370 HRTIMER_MODE_ABS);
371 else if (op->kt_ival2.tv64)
372 hrtimer_start(&op->timer,
373 ktime_add(ktime_get(), op->kt_ival2),
374 HRTIMER_MODE_ABS);
375}
376
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800377static void bcm_tx_timeout_tsklet(unsigned long data)
378{
379 struct bcm_op *op = (struct bcm_op *)data;
380 struct bcm_msg_head msg_head;
381
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800382 if (op->kt_ival1.tv64 && (op->count > 0)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800383
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800384 op->count--;
385 if (!op->count && (op->flags & TX_COUNTEVT)) {
386
387 /* create notification to user */
388 msg_head.opcode = TX_EXPIRED;
389 msg_head.flags = op->flags;
390 msg_head.count = op->count;
391 msg_head.ival1 = op->ival1;
392 msg_head.ival2 = op->ival2;
393 msg_head.can_id = op->can_id;
394 msg_head.nframes = 0;
395
396 bcm_send_to_user(op, &msg_head, NULL, 0);
397 }
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800398 bcm_can_tx(op);
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800399
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400400 } else if (op->kt_ival2.tv64)
401 bcm_can_tx(op);
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800402
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -0400403 bcm_tx_start_timer(op);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800404}
405
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800406/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300407 * bcm_tx_timeout_handler - performs cyclic CAN frame transmissions
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800408 */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700409static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800410{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700411 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800412
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800413 tasklet_schedule(&op->tsklet);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800414
Oliver Hartkoppc53a6ee2009-01-14 21:06:55 -0800415 return HRTIMER_NORESTART;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800416}
417
418/*
419 * bcm_rx_changed - create a RX_CHANGED notification due to changed content
420 */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200421static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800422{
423 struct bcm_msg_head head;
424
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800425 /* update statistics */
426 op->frames_filtered++;
427
428 /* prevent statistics overflow */
429 if (op->frames_filtered > ULONG_MAX/100)
430 op->frames_filtered = op->frames_abs = 0;
431
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800432 /* this element is not throttled anymore */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200433 data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800434
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800435 head.opcode = RX_CHANGED;
436 head.flags = op->flags;
437 head.count = op->count;
438 head.ival1 = op->ival1;
439 head.ival2 = op->ival2;
440 head.can_id = op->can_id;
441 head.nframes = 1;
442
443 bcm_send_to_user(op, &head, data, 1);
444}
445
446/*
447 * bcm_rx_update_and_send - process a detected relevant receive content change
448 * 1. update the last received data
449 * 2. send a notification to the user (if possible)
450 */
451static void bcm_rx_update_and_send(struct bcm_op *op,
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200452 struct canfd_frame *lastdata,
453 const struct canfd_frame *rxdata)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800454{
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200455 memcpy(lastdata, rxdata, op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800456
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800457 /* mark as used and throttled by default */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200458 lastdata->flags |= (RX_RECV|RX_THR);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800459
Jeremiah Mahler069f8452014-12-05 09:54:38 -0800460 /* throttling mode inactive ? */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800461 if (!op->kt_ival2.tv64) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800462 /* send RX_CHANGED to the user immediately */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800463 bcm_rx_changed(op, lastdata);
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700464 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800465 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700466
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800467 /* with active throttling timer we are just done here */
468 if (hrtimer_active(&op->thrtimer))
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700469 return;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700470
Jeremiah Mahler069f8452014-12-05 09:54:38 -0800471 /* first reception with enabled throttling mode */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800472 if (!op->kt_lastmsg.tv64)
473 goto rx_changed_settime;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700474
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800475 /* got a second frame inside a potential throttle period? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700476 if (ktime_us_delta(ktime_get(), op->kt_lastmsg) <
477 ktime_to_us(op->kt_ival2)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800478 /* do not send the saved data - only start throttle timer */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700479 hrtimer_start(&op->thrtimer,
480 ktime_add(op->kt_lastmsg, op->kt_ival2),
481 HRTIMER_MODE_ABS);
482 return;
483 }
484
485 /* the gap was that big, that throttling was not needed here */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800486rx_changed_settime:
487 bcm_rx_changed(op, lastdata);
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700488 op->kt_lastmsg = ktime_get();
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800489}
490
491/*
492 * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly
493 * received data stored in op->last_frames[]
494 */
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700495static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index,
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200496 const struct canfd_frame *rxdata)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800497{
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200498 struct canfd_frame *cf = op->frames + op->cfsiz * index;
499 struct canfd_frame *lcf = op->last_frames + op->cfsiz * index;
500 int i;
501
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800502 /*
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200503 * no one uses the MSBs of flags for comparison,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800504 * so we use it here to detect the first time of reception
505 */
506
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200507 if (!(lcf->flags & RX_RECV)) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800508 /* received data for the first time => send update to user */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200509 bcm_rx_update_and_send(op, lcf, rxdata);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800510 return;
511 }
512
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200513 /* do a real check in CAN frame data section */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200514 for (i = 0; i < rxdata->len; i += 8) {
515 if ((get_u64(cf, i) & get_u64(rxdata, i)) !=
516 (get_u64(cf, i) & get_u64(lcf, i))) {
517 bcm_rx_update_and_send(op, lcf, rxdata);
518 return;
519 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800520 }
521
522 if (op->flags & RX_CHECK_DLC) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200523 /* do a real check in CAN frame length */
524 if (rxdata->len != lcf->len) {
525 bcm_rx_update_and_send(op, lcf, rxdata);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800526 return;
527 }
528 }
529}
530
531/*
Jeremiah Mahler069f8452014-12-05 09:54:38 -0800532 * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800533 */
534static void bcm_rx_starttimer(struct bcm_op *op)
535{
536 if (op->flags & RX_NO_AUTOTIMER)
537 return;
538
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700539 if (op->kt_ival1.tv64)
540 hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800541}
542
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800543static void bcm_rx_timeout_tsklet(unsigned long data)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800544{
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800545 struct bcm_op *op = (struct bcm_op *)data;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800546 struct bcm_msg_head msg_head;
547
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800548 /* create notification to user */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800549 msg_head.opcode = RX_TIMEOUT;
550 msg_head.flags = op->flags;
551 msg_head.count = op->count;
552 msg_head.ival1 = op->ival1;
553 msg_head.ival2 = op->ival2;
554 msg_head.can_id = op->can_id;
555 msg_head.nframes = 0;
556
557 bcm_send_to_user(op, &msg_head, NULL, 0);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800558}
559
560/*
Jeremiah Mahler069f8452014-12-05 09:54:38 -0800561 * bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800562 */
563static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer)
564{
565 struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer);
566
567 /* schedule before NET_RX_SOFTIRQ */
568 tasklet_hi_schedule(&op->tsklet);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800569
570 /* no restart of the timer is done here! */
571
572 /* if user wants to be informed, when cyclic CAN-Messages come back */
573 if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) {
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200574 /* clear received CAN frames to indicate 'nothing received' */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200575 memset(op->last_frames, 0, op->nframes * op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800576 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700577
578 return HRTIMER_NORESTART;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800579}
580
581/*
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800582 * bcm_rx_do_flush - helper for bcm_rx_thr_flush
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800583 */
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700584static inline int bcm_rx_do_flush(struct bcm_op *op, int update,
585 unsigned int index)
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800586{
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200587 struct canfd_frame *lcf = op->last_frames + op->cfsiz * index;
588
589 if ((op->last_frames) && (lcf->flags & RX_THR)) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800590 if (update)
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200591 bcm_rx_changed(op, lcf);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800592 return 1;
593 }
594 return 0;
595}
596
597/*
598 * bcm_rx_thr_flush - Check for throttled data and send it to the userspace
599 *
600 * update == 0 : just check if throttled data is available (any irq context)
601 * update == 1 : check and send throttled data to userspace (soft_irq context)
602 */
603static int bcm_rx_thr_flush(struct bcm_op *op, int update)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800604{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700605 int updated = 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800606
607 if (op->nframes > 1) {
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700608 unsigned int i;
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700609
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800610 /* for MUX filter we start at index 1 */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800611 for (i = 1; i < op->nframes; i++)
612 updated += bcm_rx_do_flush(op, update, i);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800613
614 } else {
615 /* for RX_FILTER_ID and simple filter */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800616 updated += bcm_rx_do_flush(op, update, 0);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800617 }
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700618
619 return updated;
620}
621
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800622static void bcm_rx_thr_tsklet(unsigned long data)
623{
624 struct bcm_op *op = (struct bcm_op *)data;
625
626 /* push the changed data to the userspace */
627 bcm_rx_thr_flush(op, 1);
628}
629
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700630/*
631 * bcm_rx_thr_handler - the time for blocked content updates is over now:
632 * Check for throttled data and send it to the userspace
633 */
634static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer)
635{
636 struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer);
637
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800638 tasklet_schedule(&op->thrtsklet);
639
640 if (bcm_rx_thr_flush(op, 0)) {
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700641 hrtimer_forward(hrtimer, ktime_get(), op->kt_ival2);
642 return HRTIMER_RESTART;
643 } else {
644 /* rearm throttle handling */
645 op->kt_lastmsg = ktime_set(0, 0);
646 return HRTIMER_NORESTART;
647 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800648}
649
650/*
Jeremiah Mahler069f8452014-12-05 09:54:38 -0800651 * bcm_rx_handler - handle a CAN frame reception
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800652 */
653static void bcm_rx_handler(struct sk_buff *skb, void *data)
654{
655 struct bcm_op *op = (struct bcm_op *)data;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200656 const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700657 unsigned int i;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800658
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800659 if (op->can_id != rxframe->can_id)
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800660 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800661
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200662 /* make sure to handle the correct frame type (CAN / CAN FD) */
663 if (skb->len != op->cfsiz)
664 return;
665
666 /* disable timeout */
667 hrtimer_cancel(&op->timer);
668
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800669 /* save rx timestamp */
670 op->rx_stamp = skb->tstamp;
671 /* save originator for recvfrom() */
672 op->rx_ifindex = skb->dev->ifindex;
673 /* update statistics */
674 op->frames_abs++;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800675
676 if (op->flags & RX_RTR_FRAME) {
677 /* send reply for RTR-request (placed in op->frames[0]) */
678 bcm_can_tx(op);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800679 return;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800680 }
681
682 if (op->flags & RX_FILTER_ID) {
683 /* the easiest case */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800684 bcm_rx_update_and_send(op, &op->last_frames[0], rxframe);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800685 goto rx_starttimer;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800686 }
687
688 if (op->nframes == 1) {
689 /* simple compare with index 0 */
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800690 bcm_rx_cmp_to_index(op, 0, rxframe);
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800691 goto rx_starttimer;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800692 }
693
694 if (op->nframes > 1) {
695 /*
696 * multiplex compare
697 *
698 * find the first multiplex mask that fits.
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200699 * Remark: The MUX-mask is stored in index 0 - but only the
700 * first 64 bits of the frame data[] are relevant (CAN FD)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800701 */
702
703 for (i = 1; i < op->nframes; i++) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200704 if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) ==
705 (get_u64(op->frames, 0) &
706 get_u64(op->frames + op->cfsiz * i, 0))) {
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800707 bcm_rx_cmp_to_index(op, i, rxframe);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800708 break;
709 }
710 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800711 }
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800712
Oliver Hartkopp1fa17d42009-01-06 11:07:54 -0800713rx_starttimer:
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800714 bcm_rx_starttimer(op);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800715}
716
717/*
718 * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements
719 */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +0200720static struct bcm_op *bcm_find_op(struct list_head *ops,
721 struct bcm_msg_head *mh, int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800722{
723 struct bcm_op *op;
724
725 list_for_each_entry(op, ops, list) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200726 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
727 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800728 return op;
729 }
730
731 return NULL;
732}
733
734static void bcm_remove_op(struct bcm_op *op)
735{
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700736 hrtimer_cancel(&op->timer);
737 hrtimer_cancel(&op->thrtimer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800738
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800739 if (op->tsklet.func)
740 tasklet_kill(&op->tsklet);
741
742 if (op->thrtsklet.func)
743 tasklet_kill(&op->thrtsklet);
744
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800745 if ((op->frames) && (op->frames != &op->sframe))
746 kfree(op->frames);
747
748 if ((op->last_frames) && (op->last_frames != &op->last_sframe))
749 kfree(op->last_frames);
750
751 kfree(op);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800752}
753
754static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
755{
756 if (op->rx_reg_dev == dev) {
757 can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
758 bcm_rx_handler, op);
759
760 /* mark as removed subscription */
761 op->rx_reg_dev = NULL;
762 } else
763 printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device "
764 "mismatch %p %p\n", op->rx_reg_dev, dev);
765}
766
767/*
768 * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops)
769 */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +0200770static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh,
771 int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800772{
773 struct bcm_op *op, *n;
774
775 list_for_each_entry_safe(op, n, ops, list) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200776 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
777 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800778
779 /*
780 * Don't care if we're bound or not (due to netdev
781 * problems) can_rx_unregister() is always a save
782 * thing to do here.
783 */
784 if (op->ifindex) {
785 /*
786 * Only remove subscriptions that had not
787 * been removed due to NETDEV_UNREGISTER
788 * in bcm_notifier()
789 */
790 if (op->rx_reg_dev) {
791 struct net_device *dev;
792
793 dev = dev_get_by_index(&init_net,
794 op->ifindex);
795 if (dev) {
796 bcm_rx_unreg(dev, op);
797 dev_put(dev);
798 }
799 }
800 } else
801 can_rx_unregister(NULL, op->can_id,
802 REGMASK(op->can_id),
803 bcm_rx_handler, op);
804
805 list_del(&op->list);
806 bcm_remove_op(op);
807 return 1; /* done */
808 }
809 }
810
811 return 0; /* not found */
812}
813
814/*
815 * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops)
816 */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +0200817static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh,
818 int ifindex)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800819{
820 struct bcm_op *op, *n;
821
822 list_for_each_entry_safe(op, n, ops, list) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200823 if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) &&
824 (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800825 list_del(&op->list);
826 bcm_remove_op(op);
827 return 1; /* done */
828 }
829 }
830
831 return 0; /* not found */
832}
833
834/*
835 * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg)
836 */
837static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head,
838 int ifindex)
839{
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +0200840 struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800841
842 if (!op)
843 return -EINVAL;
844
845 /* put current values into msg_head */
846 msg_head->flags = op->flags;
847 msg_head->count = op->count;
848 msg_head->ival1 = op->ival1;
849 msg_head->ival2 = op->ival2;
850 msg_head->nframes = op->nframes;
851
852 bcm_send_to_user(op, msg_head, op->frames, 0);
853
854 return MHSIZ;
855}
856
857/*
858 * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg)
859 */
860static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
861 int ifindex, struct sock *sk)
862{
863 struct bcm_sock *bo = bcm_sk(sk);
864 struct bcm_op *op;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200865 struct canfd_frame *cf;
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700866 unsigned int i;
867 int err;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800868
869 /* we need a real device to send frames */
870 if (!ifindex)
871 return -ENODEV;
872
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200873 /* check nframes boundaries - we need at least one CAN frame */
Oliver Hartkopp5b75c492010-08-11 16:12:35 -0700874 if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800875 return -EINVAL;
876
877 /* check the given can_id */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +0200878 op = bcm_find_op(&bo->tx_ops, msg_head, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800879 if (op) {
880 /* update existing BCM operation */
881
882 /*
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200883 * Do we need more space for the CAN frames than currently
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800884 * allocated? -> This is a _really_ unusual use-case and
885 * therefore (complexity / locking) it is not supported.
886 */
887 if (msg_head->nframes > op->nframes)
888 return -E2BIG;
889
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200890 /* update CAN frames content */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800891 for (i = 0; i < msg_head->nframes; i++) {
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700892
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200893 cf = op->frames + op->cfsiz * i;
894 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
895
896 if (op->flags & CAN_FD_FRAME) {
897 if (cf->len > 64)
898 err = -EINVAL;
899 } else {
900 if (cf->len > 8)
901 err = -EINVAL;
902 }
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700903
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800904 if (err < 0)
905 return err;
906
907 if (msg_head->flags & TX_CP_CAN_ID) {
908 /* copy can_id into frame */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200909 cf->can_id = msg_head->can_id;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800910 }
911 }
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200912 op->flags = msg_head->flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800913
914 } else {
915 /* insert new BCM operation for the given can_id */
916
917 op = kzalloc(OPSIZ, GFP_KERNEL);
918 if (!op)
919 return -ENOMEM;
920
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200921 op->can_id = msg_head->can_id;
922 op->cfsiz = CFSIZ(msg_head->flags);
923 op->flags = msg_head->flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800924
Oliver Hartkopp72c8a892016-06-17 15:35:25 +0200925 /* create array for CAN frames and copy the data */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800926 if (msg_head->nframes > 1) {
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200927 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800928 GFP_KERNEL);
929 if (!op->frames) {
930 kfree(op);
931 return -ENOMEM;
932 }
933 } else
934 op->frames = &op->sframe;
935
936 for (i = 0; i < msg_head->nframes; i++) {
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700937
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200938 cf = op->frames + op->cfsiz * i;
939 err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz);
940
941 if (op->flags & CAN_FD_FRAME) {
942 if (cf->len > 64)
943 err = -EINVAL;
944 } else {
945 if (cf->len > 8)
946 err = -EINVAL;
947 }
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -0700948
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800949 if (err < 0) {
950 if (op->frames != &op->sframe)
951 kfree(op->frames);
952 kfree(op);
953 return err;
954 }
955
956 if (msg_head->flags & TX_CP_CAN_ID) {
957 /* copy can_id into frame */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +0200958 cf->can_id = msg_head->can_id;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800959 }
960 }
961
962 /* tx_ops never compare with previous received messages */
963 op->last_frames = NULL;
964
965 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
966 op->sk = sk;
967 op->ifindex = ifindex;
968
969 /* initialize uninitialized (kzalloc) structure */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700970 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
971 op->timer.function = bcm_tx_timeout_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800972
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -0800973 /* initialize tasklet for tx countevent notification */
974 tasklet_init(&op->tsklet, bcm_tx_timeout_tsklet,
975 (unsigned long) op);
976
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800977 /* currently unused in tx_ops */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -0700978 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800979
980 /* add this bcm_op to the list of the tx_ops */
981 list_add(&op->list, &bo->tx_ops);
982
983 } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */
984
985 if (op->nframes != msg_head->nframes) {
986 op->nframes = msg_head->nframes;
987 /* start multiple frame transmission with index 0 */
988 op->currframe = 0;
989 }
990
991 /* check flags */
992
Oliver Hartkoppffd980f2007-11-16 15:53:52 -0800993 if (op->flags & TX_RESET_MULTI_IDX) {
994 /* start multiple frame transmission with index 0 */
995 op->currframe = 0;
996 }
997
998 if (op->flags & SETTIMER) {
999 /* set timer values */
1000 op->count = msg_head->count;
1001 op->ival1 = msg_head->ival1;
1002 op->ival2 = msg_head->ival2;
Arnd Bergmannba61a8d2015-09-30 13:26:42 +02001003 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1004 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001005
1006 /* disable an active timer due to zero values? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001007 if (!op->kt_ival1.tv64 && !op->kt_ival2.tv64)
1008 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001009 }
1010
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -04001011 if (op->flags & STARTTIMER) {
1012 hrtimer_cancel(&op->timer);
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001013 /* spec: send CAN frame when starting timer */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001014 op->flags |= TX_ANNOUNCE;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001015 }
1016
Oliver Hartkoppaabdcb02011-09-23 08:23:47 +00001017 if (op->flags & TX_ANNOUNCE) {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001018 bcm_can_tx(op);
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -04001019 if (op->count)
Oliver Hartkoppaabdcb02011-09-23 08:23:47 +00001020 op->count--;
1021 }
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001022
Oliver Hartkopp12d0d0d2011-09-29 15:33:47 -04001023 if (op->flags & STARTTIMER)
1024 bcm_tx_start_timer(op);
1025
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001026 return msg_head->nframes * op->cfsiz + MHSIZ;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001027}
1028
1029/*
1030 * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg)
1031 */
1032static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
1033 int ifindex, struct sock *sk)
1034{
1035 struct bcm_sock *bo = bcm_sk(sk);
1036 struct bcm_op *op;
1037 int do_rx_register;
1038 int err = 0;
1039
1040 if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) {
1041 /* be robust against wrong usage ... */
1042 msg_head->flags |= RX_FILTER_ID;
1043 /* ignore trailing garbage */
1044 msg_head->nframes = 0;
1045 }
1046
Oliver Hartkopp5b75c492010-08-11 16:12:35 -07001047 /* the first element contains the mux-mask => MAX_NFRAMES + 1 */
1048 if (msg_head->nframes > MAX_NFRAMES + 1)
1049 return -EINVAL;
1050
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001051 if ((msg_head->flags & RX_RTR_FRAME) &&
1052 ((msg_head->nframes != 1) ||
1053 (!(msg_head->can_id & CAN_RTR_FLAG))))
1054 return -EINVAL;
1055
1056 /* check the given can_id */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001057 op = bcm_find_op(&bo->rx_ops, msg_head, ifindex);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001058 if (op) {
1059 /* update existing BCM operation */
1060
1061 /*
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001062 * Do we need more space for the CAN frames than currently
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001063 * allocated? -> This is a _really_ unusual use-case and
1064 * therefore (complexity / locking) it is not supported.
1065 */
1066 if (msg_head->nframes > op->nframes)
1067 return -E2BIG;
1068
1069 if (msg_head->nframes) {
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001070 /* update CAN frames content */
Al Viro6ce8e9c2014-04-06 21:25:44 -04001071 err = memcpy_from_msg((u8 *)op->frames, msg,
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001072 msg_head->nframes * op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001073 if (err < 0)
1074 return err;
1075
1076 /* clear last_frames to indicate 'nothing received' */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001077 memset(op->last_frames, 0, msg_head->nframes * op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001078 }
1079
1080 op->nframes = msg_head->nframes;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001081 op->flags = msg_head->flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001082
1083 /* Only an update -> do not call can_rx_register() */
1084 do_rx_register = 0;
1085
1086 } else {
1087 /* insert new BCM operation for the given can_id */
1088 op = kzalloc(OPSIZ, GFP_KERNEL);
1089 if (!op)
1090 return -ENOMEM;
1091
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001092 op->can_id = msg_head->can_id;
1093 op->nframes = msg_head->nframes;
1094 op->cfsiz = CFSIZ(msg_head->flags);
1095 op->flags = msg_head->flags;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001096
1097 if (msg_head->nframes > 1) {
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001098 /* create array for CAN frames and copy the data */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001099 op->frames = kmalloc(msg_head->nframes * op->cfsiz,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001100 GFP_KERNEL);
1101 if (!op->frames) {
1102 kfree(op);
1103 return -ENOMEM;
1104 }
1105
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001106 /* create and init array for received CAN frames */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001107 op->last_frames = kzalloc(msg_head->nframes * op->cfsiz,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001108 GFP_KERNEL);
1109 if (!op->last_frames) {
1110 kfree(op->frames);
1111 kfree(op);
1112 return -ENOMEM;
1113 }
1114
1115 } else {
1116 op->frames = &op->sframe;
1117 op->last_frames = &op->last_sframe;
1118 }
1119
1120 if (msg_head->nframes) {
Al Viro6ce8e9c2014-04-06 21:25:44 -04001121 err = memcpy_from_msg((u8 *)op->frames, msg,
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001122 msg_head->nframes * op->cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001123 if (err < 0) {
1124 if (op->frames != &op->sframe)
1125 kfree(op->frames);
1126 if (op->last_frames != &op->last_sframe)
1127 kfree(op->last_frames);
1128 kfree(op);
1129 return err;
1130 }
1131 }
1132
1133 /* bcm_can_tx / bcm_tx_timeout_handler needs this */
1134 op->sk = sk;
1135 op->ifindex = ifindex;
1136
Oliver Hartkopp81b40112012-11-26 22:24:23 +01001137 /* ifindex for timeout events w/o previous frame reception */
1138 op->rx_ifindex = ifindex;
1139
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001140 /* initialize uninitialized (kzalloc) structure */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001141 hrtimer_init(&op->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1142 op->timer.function = bcm_rx_timeout_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001143
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001144 /* initialize tasklet for rx timeout notification */
1145 tasklet_init(&op->tsklet, bcm_rx_timeout_tsklet,
1146 (unsigned long) op);
1147
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001148 hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1149 op->thrtimer.function = bcm_rx_thr_handler;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001150
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001151 /* initialize tasklet for rx throttle handling */
1152 tasklet_init(&op->thrtsklet, bcm_rx_thr_tsklet,
1153 (unsigned long) op);
1154
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001155 /* add this bcm_op to the list of the rx_ops */
1156 list_add(&op->list, &bo->rx_ops);
1157
1158 /* call can_rx_register() */
1159 do_rx_register = 1;
1160
1161 } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */
1162
1163 /* check flags */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001164
1165 if (op->flags & RX_RTR_FRAME) {
1166
1167 /* no timers in RTR-mode */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001168 hrtimer_cancel(&op->thrtimer);
1169 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001170
1171 /*
1172 * funny feature in RX(!)_SETUP only for RTR-mode:
1173 * copy can_id into frame BUT without RTR-flag to
1174 * prevent a full-load-loopback-test ... ;-]
1175 */
1176 if ((op->flags & TX_CP_CAN_ID) ||
1177 (op->frames[0].can_id == op->can_id))
1178 op->frames[0].can_id = op->can_id & ~CAN_RTR_FLAG;
1179
1180 } else {
1181 if (op->flags & SETTIMER) {
1182
1183 /* set timer value */
1184 op->ival1 = msg_head->ival1;
1185 op->ival2 = msg_head->ival2;
Arnd Bergmannba61a8d2015-09-30 13:26:42 +02001186 op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1);
1187 op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001188
1189 /* disable an active timer due to zero value? */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001190 if (!op->kt_ival1.tv64)
1191 hrtimer_cancel(&op->timer);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001192
1193 /*
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001194 * In any case cancel the throttle timer, flush
1195 * potentially blocked msgs and reset throttle handling
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001196 */
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001197 op->kt_lastmsg = ktime_set(0, 0);
1198 hrtimer_cancel(&op->thrtimer);
Oliver Hartkopp6e5c1722009-01-04 17:31:18 -08001199 bcm_rx_thr_flush(op, 1);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001200 }
1201
Oliver Hartkopp73e87e02008-04-15 19:29:14 -07001202 if ((op->flags & STARTTIMER) && op->kt_ival1.tv64)
1203 hrtimer_start(&op->timer, op->kt_ival1,
1204 HRTIMER_MODE_REL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001205 }
1206
1207 /* now we can register for can_ids, if we added a new bcm_op */
1208 if (do_rx_register) {
1209 if (ifindex) {
1210 struct net_device *dev;
1211
1212 dev = dev_get_by_index(&init_net, ifindex);
1213 if (dev) {
1214 err = can_rx_register(dev, op->can_id,
1215 REGMASK(op->can_id),
1216 bcm_rx_handler, op,
1217 "bcm");
1218
1219 op->rx_reg_dev = dev;
1220 dev_put(dev);
1221 }
1222
1223 } else
1224 err = can_rx_register(NULL, op->can_id,
1225 REGMASK(op->can_id),
1226 bcm_rx_handler, op, "bcm");
1227 if (err) {
1228 /* this bcm rx op is broken -> remove it */
1229 list_del(&op->list);
1230 bcm_remove_op(op);
1231 return err;
1232 }
1233 }
1234
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001235 return msg_head->nframes * op->cfsiz + MHSIZ;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001236}
1237
1238/*
1239 * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg)
1240 */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001241static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
1242 int cfsiz)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001243{
1244 struct sk_buff *skb;
1245 struct net_device *dev;
1246 int err;
1247
1248 /* we need a real device to send frames */
1249 if (!ifindex)
1250 return -ENODEV;
1251
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001252 skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001253 if (!skb)
1254 return -ENOMEM;
1255
Oliver Hartkopp2bf34402013-01-28 08:33:33 +00001256 can_skb_reserve(skb);
Oliver Hartkopp156c2bb2013-01-17 18:43:39 +01001257
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001258 err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001259 if (err < 0) {
1260 kfree_skb(skb);
1261 return err;
1262 }
1263
1264 dev = dev_get_by_index(&init_net, ifindex);
1265 if (!dev) {
1266 kfree_skb(skb);
1267 return -ENODEV;
1268 }
1269
Oliver Hartkopp2bf34402013-01-28 08:33:33 +00001270 can_skb_prv(skb)->ifindex = dev->ifindex;
Oliver Hartkoppd3b58c42015-06-26 11:58:19 +02001271 can_skb_prv(skb)->skbcnt = 0;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001272 skb->dev = dev;
Oliver Hartkopp0ae89be2014-01-30 10:11:28 +01001273 can_skb_set_owner(skb, sk);
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001274 err = can_send(skb, 1); /* send with loopback */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001275 dev_put(dev);
1276
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001277 if (err)
1278 return err;
1279
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001280 return cfsiz + MHSIZ;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001281}
1282
1283/*
1284 * bcm_sendmsg - process BCM commands (opcodes) from the userspace
1285 */
Ying Xue1b784142015-03-02 15:37:48 +08001286static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001287{
1288 struct sock *sk = sock->sk;
1289 struct bcm_sock *bo = bcm_sk(sk);
1290 int ifindex = bo->ifindex; /* default ifindex for this bcm_op */
1291 struct bcm_msg_head msg_head;
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001292 int cfsiz;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001293 int ret; /* read bytes or error codes as return value */
1294
1295 if (!bo->bound)
1296 return -ENOTCONN;
1297
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001298 /* check for valid message length from userspace */
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001299 if (size < MHSIZ)
1300 return -EINVAL;
1301
1302 /* read message head information */
1303 ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ);
1304 if (ret < 0)
1305 return ret;
1306
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001307 cfsiz = CFSIZ(msg_head.flags);
1308 if ((size - MHSIZ) % cfsiz)
Oliver Hartkopp7f2d38e2008-07-05 23:38:43 -07001309 return -EINVAL;
1310
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001311 /* check for alternative ifindex for this bcm_op */
1312
1313 if (!ifindex && msg->msg_name) {
1314 /* no bound device as default => check msg_name */
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001315 DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001316
Kurt Van Dijck5e5073282011-01-15 20:56:42 -08001317 if (msg->msg_namelen < sizeof(*addr))
1318 return -EINVAL;
1319
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001320 if (addr->can_family != AF_CAN)
1321 return -EINVAL;
1322
1323 /* ifindex from sendto() */
1324 ifindex = addr->can_ifindex;
1325
1326 if (ifindex) {
1327 struct net_device *dev;
1328
1329 dev = dev_get_by_index(&init_net, ifindex);
1330 if (!dev)
1331 return -ENODEV;
1332
1333 if (dev->type != ARPHRD_CAN) {
1334 dev_put(dev);
1335 return -ENODEV;
1336 }
1337
1338 dev_put(dev);
1339 }
1340 }
1341
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001342 lock_sock(sk);
1343
1344 switch (msg_head.opcode) {
1345
1346 case TX_SETUP:
1347 ret = bcm_tx_setup(&msg_head, msg, ifindex, sk);
1348 break;
1349
1350 case RX_SETUP:
1351 ret = bcm_rx_setup(&msg_head, msg, ifindex, sk);
1352 break;
1353
1354 case TX_DELETE:
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001355 if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001356 ret = MHSIZ;
1357 else
1358 ret = -EINVAL;
1359 break;
1360
1361 case RX_DELETE:
Oliver Hartkopp2b5f5f52016-06-17 15:35:26 +02001362 if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001363 ret = MHSIZ;
1364 else
1365 ret = -EINVAL;
1366 break;
1367
1368 case TX_READ:
1369 /* reuse msg_head for the reply to TX_READ */
1370 msg_head.opcode = TX_STATUS;
1371 ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex);
1372 break;
1373
1374 case RX_READ:
1375 /* reuse msg_head for the reply to RX_READ */
1376 msg_head.opcode = RX_STATUS;
1377 ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex);
1378 break;
1379
1380 case TX_SEND:
Oliver Hartkopp72c8a892016-06-17 15:35:25 +02001381 /* we need exactly one CAN frame behind the msg head */
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001382 if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001383 ret = -EINVAL;
1384 else
Oliver Hartkopp6f3b9112016-06-17 15:35:27 +02001385 ret = bcm_tx_send(msg, ifindex, sk, cfsiz);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001386 break;
1387
1388 default:
1389 ret = -EINVAL;
1390 break;
1391 }
1392
1393 release_sock(sk);
1394
1395 return ret;
1396}
1397
1398/*
1399 * notification handler for netdevice status changes
1400 */
1401static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
Jiri Pirko351638e2013-05-28 01:30:21 +00001402 void *ptr)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001403{
Jiri Pirko351638e2013-05-28 01:30:21 +00001404 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001405 struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
1406 struct sock *sk = &bo->sk;
1407 struct bcm_op *op;
1408 int notify_enodev = 0;
1409
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -07001410 if (!net_eq(dev_net(dev), &init_net))
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001411 return NOTIFY_DONE;
1412
1413 if (dev->type != ARPHRD_CAN)
1414 return NOTIFY_DONE;
1415
1416 switch (msg) {
1417
1418 case NETDEV_UNREGISTER:
1419 lock_sock(sk);
1420
1421 /* remove device specific receive entries */
1422 list_for_each_entry(op, &bo->rx_ops, list)
1423 if (op->rx_reg_dev == dev)
1424 bcm_rx_unreg(dev, op);
1425
1426 /* remove device reference, if this is our bound device */
1427 if (bo->bound && bo->ifindex == dev->ifindex) {
1428 bo->bound = 0;
1429 bo->ifindex = 0;
1430 notify_enodev = 1;
1431 }
1432
1433 release_sock(sk);
1434
1435 if (notify_enodev) {
1436 sk->sk_err = ENODEV;
1437 if (!sock_flag(sk, SOCK_DEAD))
1438 sk->sk_error_report(sk);
1439 }
1440 break;
1441
1442 case NETDEV_DOWN:
1443 if (bo->bound && bo->ifindex == dev->ifindex) {
1444 sk->sk_err = ENETDOWN;
1445 if (!sock_flag(sk, SOCK_DEAD))
1446 sk->sk_error_report(sk);
1447 }
1448 }
1449
1450 return NOTIFY_DONE;
1451}
1452
1453/*
1454 * initial settings for all BCM sockets to be set at socket creation time
1455 */
1456static int bcm_init(struct sock *sk)
1457{
1458 struct bcm_sock *bo = bcm_sk(sk);
1459
1460 bo->bound = 0;
1461 bo->ifindex = 0;
1462 bo->dropped_usr_msgs = 0;
1463 bo->bcm_proc_read = NULL;
1464
1465 INIT_LIST_HEAD(&bo->tx_ops);
1466 INIT_LIST_HEAD(&bo->rx_ops);
1467
1468 /* set notifier */
1469 bo->notifier.notifier_call = bcm_notifier;
1470
1471 register_netdevice_notifier(&bo->notifier);
1472
1473 return 0;
1474}
1475
1476/*
1477 * standard socket functions
1478 */
1479static int bcm_release(struct socket *sock)
1480{
1481 struct sock *sk = sock->sk;
Dave Jonesc6914a62011-04-19 20:36:59 -07001482 struct bcm_sock *bo;
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001483 struct bcm_op *op, *next;
1484
Dave Jonesc6914a62011-04-19 20:36:59 -07001485 if (sk == NULL)
1486 return 0;
1487
1488 bo = bcm_sk(sk);
1489
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001490 /* remove bcm_ops, timer, rx_unregister(), etc. */
1491
1492 unregister_netdevice_notifier(&bo->notifier);
1493
1494 lock_sock(sk);
1495
1496 list_for_each_entry_safe(op, next, &bo->tx_ops, list)
1497 bcm_remove_op(op);
1498
1499 list_for_each_entry_safe(op, next, &bo->rx_ops, list) {
1500 /*
1501 * Don't care if we're bound or not (due to netdev problems)
1502 * can_rx_unregister() is always a save thing to do here.
1503 */
1504 if (op->ifindex) {
1505 /*
1506 * Only remove subscriptions that had not
1507 * been removed due to NETDEV_UNREGISTER
1508 * in bcm_notifier()
1509 */
1510 if (op->rx_reg_dev) {
1511 struct net_device *dev;
1512
1513 dev = dev_get_by_index(&init_net, op->ifindex);
1514 if (dev) {
1515 bcm_rx_unreg(dev, op);
1516 dev_put(dev);
1517 }
1518 }
1519 } else
1520 can_rx_unregister(NULL, op->can_id,
1521 REGMASK(op->can_id),
1522 bcm_rx_handler, op);
1523
1524 bcm_remove_op(op);
1525 }
1526
1527 /* remove procfs entry */
1528 if (proc_dir && bo->bcm_proc_read)
1529 remove_proc_entry(bo->procname, proc_dir);
1530
1531 /* remove device reference */
1532 if (bo->bound) {
1533 bo->bound = 0;
1534 bo->ifindex = 0;
1535 }
1536
Lothar Waßmannf7e5cc02009-07-14 23:10:21 +00001537 sock_orphan(sk);
1538 sock->sk = NULL;
1539
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001540 release_sock(sk);
1541 sock_put(sk);
1542
1543 return 0;
1544}
1545
1546static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
1547 int flags)
1548{
1549 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1550 struct sock *sk = sock->sk;
1551 struct bcm_sock *bo = bcm_sk(sk);
1552
Changli Gao6503d962010-03-31 22:58:26 +00001553 if (len < sizeof(*addr))
1554 return -EINVAL;
1555
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001556 if (bo->bound)
1557 return -EISCONN;
1558
1559 /* bind a device to this socket */
1560 if (addr->can_ifindex) {
1561 struct net_device *dev;
1562
1563 dev = dev_get_by_index(&init_net, addr->can_ifindex);
1564 if (!dev)
1565 return -ENODEV;
1566
1567 if (dev->type != ARPHRD_CAN) {
1568 dev_put(dev);
1569 return -ENODEV;
1570 }
1571
1572 bo->ifindex = dev->ifindex;
1573 dev_put(dev);
1574
1575 } else {
1576 /* no interface reference for ifindex = 0 ('any' CAN device) */
1577 bo->ifindex = 0;
1578 }
1579
1580 bo->bound = 1;
1581
1582 if (proc_dir) {
1583 /* unique socket address as filename */
Dan Rosenberg9f260e02010-12-26 06:54:53 +00001584 sprintf(bo->procname, "%lu", sock_i_ino(sk));
Alexey Dobriyanea00b8e2009-08-28 09:57:21 +00001585 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
1586 proc_dir,
1587 &bcm_proc_fops, sk);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001588 }
1589
1590 return 0;
1591}
1592
Ying Xue1b784142015-03-02 15:37:48 +08001593static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1594 int flags)
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001595{
1596 struct sock *sk = sock->sk;
1597 struct sk_buff *skb;
1598 int error = 0;
1599 int noblock;
1600 int err;
1601
1602 noblock = flags & MSG_DONTWAIT;
1603 flags &= ~MSG_DONTWAIT;
1604 skb = skb_recv_datagram(sk, flags, noblock, &error);
1605 if (!skb)
1606 return error;
1607
1608 if (skb->len < size)
1609 size = skb->len;
1610
Al Viro7eab8d92014-04-06 21:51:23 -04001611 err = memcpy_to_msg(msg, skb->data, size);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001612 if (err < 0) {
1613 skb_free_datagram(sk, skb);
1614 return err;
1615 }
1616
Neil Horman3b885782009-10-12 13:26:31 -07001617 sock_recv_ts_and_drops(msg, sk, skb);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001618
1619 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001620 __sockaddr_check_size(sizeof(struct sockaddr_can));
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001621 msg->msg_namelen = sizeof(struct sockaddr_can);
1622 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1623 }
1624
1625 skb_free_datagram(sk, skb);
1626
1627 return size;
1628}
1629
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001630static const struct proto_ops bcm_ops = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001631 .family = PF_CAN,
1632 .release = bcm_release,
1633 .bind = sock_no_bind,
1634 .connect = bcm_connect,
1635 .socketpair = sock_no_socketpair,
1636 .accept = sock_no_accept,
1637 .getname = sock_no_getname,
1638 .poll = datagram_poll,
Oliver Hartkopp53914b62011-03-22 08:27:25 +00001639 .ioctl = can_ioctl, /* use can_ioctl() from af_can.c */
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001640 .listen = sock_no_listen,
1641 .shutdown = sock_no_shutdown,
1642 .setsockopt = sock_no_setsockopt,
1643 .getsockopt = sock_no_getsockopt,
1644 .sendmsg = bcm_sendmsg,
1645 .recvmsg = bcm_recvmsg,
1646 .mmap = sock_no_mmap,
1647 .sendpage = sock_no_sendpage,
1648};
1649
1650static struct proto bcm_proto __read_mostly = {
1651 .name = "CAN_BCM",
1652 .owner = THIS_MODULE,
1653 .obj_size = sizeof(struct bcm_sock),
1654 .init = bcm_init,
1655};
1656
Kurt Van Dijck16506292011-05-03 18:40:57 +00001657static const struct can_proto bcm_can_proto = {
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001658 .type = SOCK_DGRAM,
1659 .protocol = CAN_BCM,
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001660 .ops = &bcm_ops,
1661 .prot = &bcm_proto,
1662};
1663
1664static int __init bcm_module_init(void)
1665{
1666 int err;
1667
Jeremiah Mahlerb111b782014-11-21 23:42:35 -08001668 pr_info("can: broadcast manager protocol (rev " CAN_BCM_VERSION " t)\n");
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001669
1670 err = can_proto_register(&bcm_can_proto);
1671 if (err < 0) {
1672 printk(KERN_ERR "can: registration of bcm protocol failed\n");
1673 return err;
1674 }
1675
1676 /* create /proc/net/can-bcm directory */
1677 proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001678 return 0;
1679}
1680
1681static void __exit bcm_module_exit(void)
1682{
1683 can_proto_unregister(&bcm_can_proto);
1684
1685 if (proc_dir)
Gao fengece31ff2013-02-18 01:34:56 +00001686 remove_proc_entry("can-bcm", init_net.proc_net);
Oliver Hartkoppffd980f2007-11-16 15:53:52 -08001687}
1688
1689module_init(bcm_module_init);
1690module_exit(bcm_module_exit);