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d77cd7fe | 1 | // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
ffd980f9 OH |
2 | /* |
3 | * bcm.c - Broadcast Manager to filter/send (cyclic) CAN content | |
4 | * | |
384317ef | 5 | * Copyright (c) 2002-2017 Volkswagen Group Electronic Research |
ffd980f9 OH |
6 | * All rights reserved. |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the name of Volkswagen nor the names of its contributors | |
17 | * may be used to endorse or promote products derived from this software | |
18 | * without specific prior written permission. | |
19 | * | |
20 | * Alternatively, provided that this notice is retained in full, this | |
21 | * software may be distributed under the terms of the GNU General | |
22 | * Public License ("GPL") version 2, in which case the provisions of the | |
23 | * GPL apply INSTEAD OF those given above. | |
24 | * | |
25 | * The provided data structures and external interfaces from this code | |
26 | * are not restricted to be used by modules with a GPL compatible license. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
29 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
30 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
31 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
32 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
33 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
34 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
38 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
39 | * DAMAGE. | |
40 | * | |
ffd980f9 OH |
41 | */ |
42 | ||
43 | #include <linux/module.h> | |
44 | #include <linux/init.h> | |
a6b7a407 | 45 | #include <linux/interrupt.h> |
73e87e02 | 46 | #include <linux/hrtimer.h> |
ffd980f9 OH |
47 | #include <linux/list.h> |
48 | #include <linux/proc_fs.h> | |
ea00b8e2 | 49 | #include <linux/seq_file.h> |
ffd980f9 OH |
50 | #include <linux/uio.h> |
51 | #include <linux/net.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/socket.h> | |
54 | #include <linux/if_arp.h> | |
55 | #include <linux/skbuff.h> | |
56 | #include <linux/can.h> | |
57 | #include <linux/can/core.h> | |
156c2bb9 | 58 | #include <linux/can/skb.h> |
ffd980f9 | 59 | #include <linux/can/bcm.h> |
5a0e3ad6 | 60 | #include <linux/slab.h> |
ffd980f9 OH |
61 | #include <net/sock.h> |
62 | #include <net/net_namespace.h> | |
63 | ||
5b75c497 OH |
64 | /* |
65 | * To send multiple CAN frame content within TX_SETUP or to filter | |
66 | * CAN messages with multiplex index within RX_SETUP, the number of | |
67 | * different filters is limited to 256 due to the one byte index value. | |
68 | */ | |
69 | #define MAX_NFRAMES 256 | |
70 | ||
93171ba6 OH |
71 | /* limit timers to 400 days for sending/timeouts */ |
72 | #define BCM_TIMER_SEC_MAX (400 * 24 * 60 * 60) | |
73 | ||
6f3b911d | 74 | /* use of last_frames[index].flags */ |
ffd980f9 OH |
75 | #define RX_RECV 0x40 /* received data for this element */ |
76 | #define RX_THR 0x80 /* element not been sent due to throttle feature */ | |
6f3b911d | 77 | #define BCM_CAN_FLAGS_MASK 0x3F /* to clean private flags after usage */ |
ffd980f9 OH |
78 | |
79 | /* get best masking value for can_rx_register() for a given single can_id */ | |
d253eee2 OH |
80 | #define REGMASK(id) ((id & CAN_EFF_FLAG) ? \ |
81 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ | |
82 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) | |
ffd980f9 | 83 | |
ffd980f9 OH |
84 | MODULE_DESCRIPTION("PF_CAN broadcast manager protocol"); |
85 | MODULE_LICENSE("Dual BSD/GPL"); | |
86 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
b13bb2e9 | 87 | MODULE_ALIAS("can-proto-2"); |
ffd980f9 | 88 | |
9e971474 OH |
89 | #define BCM_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex) |
90 | ||
6f3b911d OH |
91 | /* |
92 | * easy access to the first 64 bit of can(fd)_frame payload. cp->data is | |
93 | * 64 bit aligned so the offset has to be multiples of 8 which is ensured | |
94 | * by the only callers in bcm_rx_cmp_to_index() bcm_rx_handler(). | |
95 | */ | |
96 | static inline u64 get_u64(const struct canfd_frame *cp, int offset) | |
ffd980f9 | 97 | { |
6f3b911d | 98 | return *(u64 *)(cp->data + offset); |
ffd980f9 OH |
99 | } |
100 | ||
101 | struct bcm_op { | |
102 | struct list_head list; | |
f1b4e32a | 103 | struct rcu_head rcu; |
ffd980f9 OH |
104 | int ifindex; |
105 | canid_t can_id; | |
5b75c497 | 106 | u32 flags; |
ffd980f9 | 107 | unsigned long frames_abs, frames_filtered; |
ba61a8d9 | 108 | struct bcm_timeval ival1, ival2; |
73e87e02 OH |
109 | struct hrtimer timer, thrtimer; |
110 | ktime_t rx_stamp, kt_ival1, kt_ival2, kt_lastmsg; | |
ffd980f9 | 111 | int rx_ifindex; |
6f3b911d | 112 | int cfsiz; |
5b75c497 OH |
113 | u32 count; |
114 | u32 nframes; | |
115 | u32 currframe; | |
5499a6b2 OH |
116 | /* void pointers to arrays of struct can[fd]_frame */ |
117 | void *frames; | |
118 | void *last_frames; | |
6f3b911d OH |
119 | struct canfd_frame sframe; |
120 | struct canfd_frame last_sframe; | |
ffd980f9 OH |
121 | struct sock *sk; |
122 | struct net_device *rx_reg_dev; | |
123 | }; | |
124 | ||
ffd980f9 OH |
125 | struct bcm_sock { |
126 | struct sock sk; | |
127 | int bound; | |
128 | int ifindex; | |
8d0caedb | 129 | struct list_head notifier; |
ffd980f9 OH |
130 | struct list_head rx_ops; |
131 | struct list_head tx_ops; | |
132 | unsigned long dropped_usr_msgs; | |
133 | struct proc_dir_entry *bcm_proc_read; | |
9f260e0e | 134 | char procname [32]; /* inode number in decimal with \0 */ |
ffd980f9 OH |
135 | }; |
136 | ||
8d0caedb TH |
137 | static LIST_HEAD(bcm_notifier_list); |
138 | static DEFINE_SPINLOCK(bcm_notifier_lock); | |
139 | static struct bcm_sock *bcm_busy_notifier; | |
140 | ||
ffd980f9 OH |
141 | static inline struct bcm_sock *bcm_sk(const struct sock *sk) |
142 | { | |
143 | return (struct bcm_sock *)sk; | |
144 | } | |
145 | ||
ba61a8d9 AB |
146 | static inline ktime_t bcm_timeval_to_ktime(struct bcm_timeval tv) |
147 | { | |
148 | return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC); | |
149 | } | |
150 | ||
93171ba6 OH |
151 | /* check limitations for timeval provided by user */ |
152 | static bool bcm_is_invalid_tv(struct bcm_msg_head *msg_head) | |
153 | { | |
154 | if ((msg_head->ival1.tv_sec < 0) || | |
155 | (msg_head->ival1.tv_sec > BCM_TIMER_SEC_MAX) || | |
156 | (msg_head->ival1.tv_usec < 0) || | |
157 | (msg_head->ival1.tv_usec >= USEC_PER_SEC) || | |
158 | (msg_head->ival2.tv_sec < 0) || | |
159 | (msg_head->ival2.tv_sec > BCM_TIMER_SEC_MAX) || | |
160 | (msg_head->ival2.tv_usec < 0) || | |
161 | (msg_head->ival2.tv_usec >= USEC_PER_SEC)) | |
162 | return true; | |
163 | ||
164 | return false; | |
165 | } | |
166 | ||
6f3b911d | 167 | #define CFSIZ(flags) ((flags & CAN_FD_FRAME) ? CANFD_MTU : CAN_MTU) |
ffd980f9 OH |
168 | #define OPSIZ sizeof(struct bcm_op) |
169 | #define MHSIZ sizeof(struct bcm_msg_head) | |
170 | ||
ffd980f9 OH |
171 | /* |
172 | * procfs functions | |
173 | */ | |
c2701b37 | 174 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 175 | static char *bcm_proc_getifname(struct net *net, char *result, int ifindex) |
ffd980f9 OH |
176 | { |
177 | struct net_device *dev; | |
178 | ||
179 | if (!ifindex) | |
180 | return "any"; | |
181 | ||
ff879eb6 | 182 | rcu_read_lock(); |
384317ef | 183 | dev = dev_get_by_index_rcu(net, ifindex); |
ffd980f9 | 184 | if (dev) |
6755aeba ED |
185 | strcpy(result, dev->name); |
186 | else | |
187 | strcpy(result, "???"); | |
ff879eb6 | 188 | rcu_read_unlock(); |
ffd980f9 | 189 | |
6755aeba | 190 | return result; |
ffd980f9 OH |
191 | } |
192 | ||
ea00b8e2 | 193 | static int bcm_proc_show(struct seq_file *m, void *v) |
ffd980f9 | 194 | { |
6755aeba | 195 | char ifname[IFNAMSIZ]; |
384317ef | 196 | struct net *net = m->private; |
359745d7 | 197 | struct sock *sk = (struct sock *)pde_data(m->file->f_inode); |
ffd980f9 OH |
198 | struct bcm_sock *bo = bcm_sk(sk); |
199 | struct bcm_op *op; | |
200 | ||
71338aa7 DR |
201 | seq_printf(m, ">>> socket %pK", sk->sk_socket); |
202 | seq_printf(m, " / sk %pK", sk); | |
203 | seq_printf(m, " / bo %pK", bo); | |
ea00b8e2 | 204 | seq_printf(m, " / dropped %lu", bo->dropped_usr_msgs); |
384317ef | 205 | seq_printf(m, " / bound %s", bcm_proc_getifname(net, ifname, bo->ifindex)); |
ea00b8e2 | 206 | seq_printf(m, " <<<\n"); |
ffd980f9 OH |
207 | |
208 | list_for_each_entry(op, &bo->rx_ops, list) { | |
209 | ||
210 | unsigned long reduction; | |
211 | ||
212 | /* print only active entries & prevent division by zero */ | |
213 | if (!op->frames_abs) | |
214 | continue; | |
215 | ||
6f3b911d | 216 | seq_printf(m, "rx_op: %03X %-5s ", op->can_id, |
384317ef | 217 | bcm_proc_getifname(net, ifname, op->ifindex)); |
6f3b911d OH |
218 | |
219 | if (op->flags & CAN_FD_FRAME) | |
220 | seq_printf(m, "(%u)", op->nframes); | |
221 | else | |
222 | seq_printf(m, "[%u]", op->nframes); | |
223 | ||
224 | seq_printf(m, "%c ", (op->flags & RX_CHECK_DLC) ? 'd' : ' '); | |
225 | ||
2456e855 | 226 | if (op->kt_ival1) |
ea00b8e2 | 227 | seq_printf(m, "timeo=%lld ", |
95acb490 | 228 | (long long)ktime_to_us(op->kt_ival1)); |
ffd980f9 | 229 | |
2456e855 | 230 | if (op->kt_ival2) |
ea00b8e2 | 231 | seq_printf(m, "thr=%lld ", |
95acb490 | 232 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 233 | |
ea00b8e2 | 234 | seq_printf(m, "# recv %ld (%ld) => reduction: ", |
95acb490 | 235 | op->frames_filtered, op->frames_abs); |
ffd980f9 OH |
236 | |
237 | reduction = 100 - (op->frames_filtered * 100) / op->frames_abs; | |
238 | ||
ea00b8e2 | 239 | seq_printf(m, "%s%ld%%\n", |
95acb490 | 240 | (reduction == 100) ? "near " : "", reduction); |
ffd980f9 OH |
241 | } |
242 | ||
243 | list_for_each_entry(op, &bo->tx_ops, list) { | |
244 | ||
6f3b911d | 245 | seq_printf(m, "tx_op: %03X %s ", op->can_id, |
384317ef | 246 | bcm_proc_getifname(net, ifname, op->ifindex)); |
6f3b911d OH |
247 | |
248 | if (op->flags & CAN_FD_FRAME) | |
249 | seq_printf(m, "(%u) ", op->nframes); | |
250 | else | |
251 | seq_printf(m, "[%u] ", op->nframes); | |
ffd980f9 | 252 | |
2456e855 | 253 | if (op->kt_ival1) |
ea00b8e2 | 254 | seq_printf(m, "t1=%lld ", |
95acb490 | 255 | (long long)ktime_to_us(op->kt_ival1)); |
73e87e02 | 256 | |
2456e855 | 257 | if (op->kt_ival2) |
ea00b8e2 | 258 | seq_printf(m, "t2=%lld ", |
95acb490 | 259 | (long long)ktime_to_us(op->kt_ival2)); |
ffd980f9 | 260 | |
ea00b8e2 | 261 | seq_printf(m, "# sent %ld\n", op->frames_abs); |
ffd980f9 | 262 | } |
ea00b8e2 AD |
263 | seq_putc(m, '\n'); |
264 | return 0; | |
265 | } | |
c2701b37 | 266 | #endif /* CONFIG_PROC_FS */ |
ea00b8e2 | 267 | |
ffd980f9 OH |
268 | /* |
269 | * bcm_can_tx - send the (next) CAN frame to the appropriate CAN interface | |
270 | * of the given bcm tx op | |
271 | */ | |
272 | static void bcm_can_tx(struct bcm_op *op) | |
273 | { | |
274 | struct sk_buff *skb; | |
275 | struct net_device *dev; | |
6f3b911d | 276 | struct canfd_frame *cf = op->frames + op->cfsiz * op->currframe; |
ffd980f9 OH |
277 | |
278 | /* no target device? => exit */ | |
279 | if (!op->ifindex) | |
280 | return; | |
281 | ||
384317ef | 282 | dev = dev_get_by_index(sock_net(op->sk), op->ifindex); |
ffd980f9 OH |
283 | if (!dev) { |
284 | /* RFC: should this bcm_op remove itself here? */ | |
285 | return; | |
286 | } | |
287 | ||
6f3b911d | 288 | skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any()); |
ffd980f9 OH |
289 | if (!skb) |
290 | goto out; | |
291 | ||
2bf3440d OH |
292 | can_skb_reserve(skb); |
293 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 294 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 295 | |
59ae1d12 | 296 | skb_put_data(skb, cf, op->cfsiz); |
ffd980f9 OH |
297 | |
298 | /* send with loopback */ | |
299 | skb->dev = dev; | |
0ae89beb | 300 | can_skb_set_owner(skb, op->sk); |
ffd980f9 OH |
301 | can_send(skb, 1); |
302 | ||
303 | /* update statistics */ | |
304 | op->currframe++; | |
305 | op->frames_abs++; | |
306 | ||
307 | /* reached last frame? */ | |
308 | if (op->currframe >= op->nframes) | |
309 | op->currframe = 0; | |
95acb490 | 310 | out: |
ffd980f9 OH |
311 | dev_put(dev); |
312 | } | |
313 | ||
314 | /* | |
315 | * bcm_send_to_user - send a BCM message to the userspace | |
316 | * (consisting of bcm_msg_head + x CAN frames) | |
317 | */ | |
318 | static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head, | |
6f3b911d | 319 | struct canfd_frame *frames, int has_timestamp) |
ffd980f9 OH |
320 | { |
321 | struct sk_buff *skb; | |
6f3b911d | 322 | struct canfd_frame *firstframe; |
ffd980f9 OH |
323 | struct sockaddr_can *addr; |
324 | struct sock *sk = op->sk; | |
6f3b911d | 325 | unsigned int datalen = head->nframes * op->cfsiz; |
ffd980f9 OH |
326 | int err; |
327 | ||
328 | skb = alloc_skb(sizeof(*head) + datalen, gfp_any()); | |
329 | if (!skb) | |
330 | return; | |
331 | ||
59ae1d12 | 332 | skb_put_data(skb, head, sizeof(*head)); |
ffd980f9 OH |
333 | |
334 | if (head->nframes) { | |
72c8a89a | 335 | /* CAN frames starting here */ |
6f3b911d | 336 | firstframe = (struct canfd_frame *)skb_tail_pointer(skb); |
ffd980f9 | 337 | |
59ae1d12 | 338 | skb_put_data(skb, frames, datalen); |
ffd980f9 OH |
339 | |
340 | /* | |
6f3b911d | 341 | * the BCM uses the flags-element of the canfd_frame |
ffd980f9 OH |
342 | * structure for internal purposes. This is only |
343 | * relevant for updates that are generated by the | |
344 | * BCM, where nframes is 1 | |
345 | */ | |
346 | if (head->nframes == 1) | |
6f3b911d | 347 | firstframe->flags &= BCM_CAN_FLAGS_MASK; |
ffd980f9 OH |
348 | } |
349 | ||
350 | if (has_timestamp) { | |
351 | /* restore rx timestamp */ | |
352 | skb->tstamp = op->rx_stamp; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Put the datagram to the queue so that bcm_recvmsg() can | |
357 | * get it from there. We need to pass the interface index to | |
358 | * bcm_recvmsg(). We pass a whole struct sockaddr_can in skb->cb | |
359 | * containing the interface index. | |
360 | */ | |
361 | ||
b4772ef8 | 362 | sock_skb_cb_check_size(sizeof(struct sockaddr_can)); |
ffd980f9 OH |
363 | addr = (struct sockaddr_can *)skb->cb; |
364 | memset(addr, 0, sizeof(*addr)); | |
365 | addr->can_family = AF_CAN; | |
366 | addr->can_ifindex = op->rx_ifindex; | |
367 | ||
368 | err = sock_queue_rcv_skb(sk, skb); | |
369 | if (err < 0) { | |
370 | struct bcm_sock *bo = bcm_sk(sk); | |
371 | ||
372 | kfree_skb(skb); | |
373 | /* don't care about overflows in this statistic */ | |
374 | bo->dropped_usr_msgs++; | |
375 | } | |
376 | } | |
377 | ||
bf74aa86 | 378 | static bool bcm_tx_set_expiry(struct bcm_op *op, struct hrtimer *hrt) |
12d0d0d3 | 379 | { |
bf74aa86 TG |
380 | ktime_t ival; |
381 | ||
2456e855 | 382 | if (op->kt_ival1 && op->count) |
bf74aa86 | 383 | ival = op->kt_ival1; |
2456e855 | 384 | else if (op->kt_ival2) |
bf74aa86 TG |
385 | ival = op->kt_ival2; |
386 | else | |
387 | return false; | |
388 | ||
389 | hrtimer_set_expires(hrt, ktime_add(ktime_get(), ival)); | |
390 | return true; | |
12d0d0d3 OH |
391 | } |
392 | ||
bf74aa86 | 393 | static void bcm_tx_start_timer(struct bcm_op *op) |
6e5c172c | 394 | { |
bf74aa86 TG |
395 | if (bcm_tx_set_expiry(op, &op->timer)) |
396 | hrtimer_start_expires(&op->timer, HRTIMER_MODE_ABS_SOFT); | |
397 | } | |
398 | ||
399 | /* bcm_tx_timeout_handler - performs cyclic CAN frame transmissions */ | |
400 | static enum hrtimer_restart bcm_tx_timeout_handler(struct hrtimer *hrtimer) | |
401 | { | |
402 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); | |
6e5c172c OH |
403 | struct bcm_msg_head msg_head; |
404 | ||
2456e855 | 405 | if (op->kt_ival1 && (op->count > 0)) { |
ffd980f9 | 406 | op->count--; |
c53a6ee8 OH |
407 | if (!op->count && (op->flags & TX_COUNTEVT)) { |
408 | ||
409 | /* create notification to user */ | |
5e87ddbe | 410 | memset(&msg_head, 0, sizeof(msg_head)); |
c53a6ee8 OH |
411 | msg_head.opcode = TX_EXPIRED; |
412 | msg_head.flags = op->flags; | |
413 | msg_head.count = op->count; | |
414 | msg_head.ival1 = op->ival1; | |
415 | msg_head.ival2 = op->ival2; | |
416 | msg_head.can_id = op->can_id; | |
417 | msg_head.nframes = 0; | |
418 | ||
419 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
420 | } | |
ffd980f9 | 421 | bcm_can_tx(op); |
ffd980f9 | 422 | |
bf74aa86 | 423 | } else if (op->kt_ival2) { |
12d0d0d3 | 424 | bcm_can_tx(op); |
bf74aa86 | 425 | } |
ffd980f9 | 426 | |
bf74aa86 TG |
427 | return bcm_tx_set_expiry(op, &op->timer) ? |
428 | HRTIMER_RESTART : HRTIMER_NORESTART; | |
ffd980f9 OH |
429 | } |
430 | ||
431 | /* | |
432 | * bcm_rx_changed - create a RX_CHANGED notification due to changed content | |
433 | */ | |
6f3b911d | 434 | static void bcm_rx_changed(struct bcm_op *op, struct canfd_frame *data) |
ffd980f9 OH |
435 | { |
436 | struct bcm_msg_head head; | |
437 | ||
ffd980f9 OH |
438 | /* update statistics */ |
439 | op->frames_filtered++; | |
440 | ||
441 | /* prevent statistics overflow */ | |
442 | if (op->frames_filtered > ULONG_MAX/100) | |
443 | op->frames_filtered = op->frames_abs = 0; | |
444 | ||
6e5c172c | 445 | /* this element is not throttled anymore */ |
6f3b911d | 446 | data->flags &= (BCM_CAN_FLAGS_MASK|RX_RECV); |
6e5c172c | 447 | |
5e87ddbe | 448 | memset(&head, 0, sizeof(head)); |
ffd980f9 OH |
449 | head.opcode = RX_CHANGED; |
450 | head.flags = op->flags; | |
451 | head.count = op->count; | |
452 | head.ival1 = op->ival1; | |
453 | head.ival2 = op->ival2; | |
454 | head.can_id = op->can_id; | |
455 | head.nframes = 1; | |
456 | ||
457 | bcm_send_to_user(op, &head, data, 1); | |
458 | } | |
459 | ||
460 | /* | |
461 | * bcm_rx_update_and_send - process a detected relevant receive content change | |
462 | * 1. update the last received data | |
463 | * 2. send a notification to the user (if possible) | |
464 | */ | |
465 | static void bcm_rx_update_and_send(struct bcm_op *op, | |
6f3b911d OH |
466 | struct canfd_frame *lastdata, |
467 | const struct canfd_frame *rxdata) | |
ffd980f9 | 468 | { |
6f3b911d | 469 | memcpy(lastdata, rxdata, op->cfsiz); |
ffd980f9 | 470 | |
6e5c172c | 471 | /* mark as used and throttled by default */ |
6f3b911d | 472 | lastdata->flags |= (RX_RECV|RX_THR); |
ffd980f9 | 473 | |
069f8457 | 474 | /* throttling mode inactive ? */ |
2456e855 | 475 | if (!op->kt_ival2) { |
73e87e02 | 476 | /* send RX_CHANGED to the user immediately */ |
6e5c172c | 477 | bcm_rx_changed(op, lastdata); |
73e87e02 OH |
478 | return; |
479 | } | |
ffd980f9 | 480 | |
6e5c172c OH |
481 | /* with active throttling timer we are just done here */ |
482 | if (hrtimer_active(&op->thrtimer)) | |
73e87e02 | 483 | return; |
ffd980f9 | 484 | |
069f8457 | 485 | /* first reception with enabled throttling mode */ |
2456e855 | 486 | if (!op->kt_lastmsg) |
6e5c172c | 487 | goto rx_changed_settime; |
73e87e02 | 488 | |
6e5c172c | 489 | /* got a second frame inside a potential throttle period? */ |
73e87e02 OH |
490 | if (ktime_us_delta(ktime_get(), op->kt_lastmsg) < |
491 | ktime_to_us(op->kt_ival2)) { | |
6e5c172c | 492 | /* do not send the saved data - only start throttle timer */ |
73e87e02 OH |
493 | hrtimer_start(&op->thrtimer, |
494 | ktime_add(op->kt_lastmsg, op->kt_ival2), | |
bf74aa86 | 495 | HRTIMER_MODE_ABS_SOFT); |
73e87e02 OH |
496 | return; |
497 | } | |
498 | ||
499 | /* the gap was that big, that throttling was not needed here */ | |
6e5c172c OH |
500 | rx_changed_settime: |
501 | bcm_rx_changed(op, lastdata); | |
73e87e02 | 502 | op->kt_lastmsg = ktime_get(); |
ffd980f9 OH |
503 | } |
504 | ||
505 | /* | |
506 | * bcm_rx_cmp_to_index - (bit)compares the currently received data to formerly | |
507 | * received data stored in op->last_frames[] | |
508 | */ | |
5b75c497 | 509 | static void bcm_rx_cmp_to_index(struct bcm_op *op, unsigned int index, |
6f3b911d | 510 | const struct canfd_frame *rxdata) |
ffd980f9 | 511 | { |
6f3b911d OH |
512 | struct canfd_frame *cf = op->frames + op->cfsiz * index; |
513 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; | |
514 | int i; | |
515 | ||
ffd980f9 | 516 | /* |
6f3b911d | 517 | * no one uses the MSBs of flags for comparison, |
ffd980f9 OH |
518 | * so we use it here to detect the first time of reception |
519 | */ | |
520 | ||
6f3b911d | 521 | if (!(lcf->flags & RX_RECV)) { |
ffd980f9 | 522 | /* received data for the first time => send update to user */ |
6f3b911d | 523 | bcm_rx_update_and_send(op, lcf, rxdata); |
ffd980f9 OH |
524 | return; |
525 | } | |
526 | ||
72c8a89a | 527 | /* do a real check in CAN frame data section */ |
6f3b911d OH |
528 | for (i = 0; i < rxdata->len; i += 8) { |
529 | if ((get_u64(cf, i) & get_u64(rxdata, i)) != | |
530 | (get_u64(cf, i) & get_u64(lcf, i))) { | |
531 | bcm_rx_update_and_send(op, lcf, rxdata); | |
532 | return; | |
533 | } | |
ffd980f9 OH |
534 | } |
535 | ||
536 | if (op->flags & RX_CHECK_DLC) { | |
6f3b911d OH |
537 | /* do a real check in CAN frame length */ |
538 | if (rxdata->len != lcf->len) { | |
539 | bcm_rx_update_and_send(op, lcf, rxdata); | |
ffd980f9 OH |
540 | return; |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | /* | |
069f8457 | 546 | * bcm_rx_starttimer - enable timeout monitoring for CAN frame reception |
ffd980f9 OH |
547 | */ |
548 | static void bcm_rx_starttimer(struct bcm_op *op) | |
549 | { | |
550 | if (op->flags & RX_NO_AUTOTIMER) | |
551 | return; | |
552 | ||
2456e855 | 553 | if (op->kt_ival1) |
bf74aa86 | 554 | hrtimer_start(&op->timer, op->kt_ival1, HRTIMER_MODE_REL_SOFT); |
ffd980f9 OH |
555 | } |
556 | ||
bf74aa86 TG |
557 | /* bcm_rx_timeout_handler - when the (cyclic) CAN frame reception timed out */ |
558 | static enum hrtimer_restart bcm_rx_timeout_handler(struct hrtimer *hrtimer) | |
ffd980f9 | 559 | { |
bf74aa86 | 560 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, timer); |
ffd980f9 OH |
561 | struct bcm_msg_head msg_head; |
562 | ||
bf74aa86 TG |
563 | /* if user wants to be informed, when cyclic CAN-Messages come back */ |
564 | if ((op->flags & RX_ANNOUNCE_RESUME) && op->last_frames) { | |
565 | /* clear received CAN frames to indicate 'nothing received' */ | |
566 | memset(op->last_frames, 0, op->nframes * op->cfsiz); | |
567 | } | |
568 | ||
6e5c172c | 569 | /* create notification to user */ |
5e87ddbe | 570 | memset(&msg_head, 0, sizeof(msg_head)); |
ffd980f9 OH |
571 | msg_head.opcode = RX_TIMEOUT; |
572 | msg_head.flags = op->flags; | |
573 | msg_head.count = op->count; | |
574 | msg_head.ival1 = op->ival1; | |
575 | msg_head.ival2 = op->ival2; | |
576 | msg_head.can_id = op->can_id; | |
577 | msg_head.nframes = 0; | |
578 | ||
579 | bcm_send_to_user(op, &msg_head, NULL, 0); | |
73e87e02 OH |
580 | |
581 | return HRTIMER_NORESTART; | |
ffd980f9 OH |
582 | } |
583 | ||
6e5c172c OH |
584 | /* |
585 | * bcm_rx_do_flush - helper for bcm_rx_thr_flush | |
586 | */ | |
bf74aa86 | 587 | static inline int bcm_rx_do_flush(struct bcm_op *op, unsigned int index) |
6e5c172c | 588 | { |
6f3b911d OH |
589 | struct canfd_frame *lcf = op->last_frames + op->cfsiz * index; |
590 | ||
591 | if ((op->last_frames) && (lcf->flags & RX_THR)) { | |
bf74aa86 | 592 | bcm_rx_changed(op, lcf); |
6e5c172c OH |
593 | return 1; |
594 | } | |
595 | return 0; | |
596 | } | |
597 | ||
ffd980f9 | 598 | /* |
73e87e02 | 599 | * bcm_rx_thr_flush - Check for throttled data and send it to the userspace |
ffd980f9 | 600 | */ |
bf74aa86 | 601 | static int bcm_rx_thr_flush(struct bcm_op *op) |
ffd980f9 | 602 | { |
73e87e02 | 603 | int updated = 0; |
ffd980f9 OH |
604 | |
605 | if (op->nframes > 1) { | |
5b75c497 | 606 | unsigned int i; |
73e87e02 | 607 | |
ffd980f9 | 608 | /* for MUX filter we start at index 1 */ |
6e5c172c | 609 | for (i = 1; i < op->nframes; i++) |
bf74aa86 | 610 | updated += bcm_rx_do_flush(op, i); |
ffd980f9 OH |
611 | |
612 | } else { | |
613 | /* for RX_FILTER_ID and simple filter */ | |
bf74aa86 | 614 | updated += bcm_rx_do_flush(op, 0); |
ffd980f9 | 615 | } |
73e87e02 OH |
616 | |
617 | return updated; | |
618 | } | |
619 | ||
620 | /* | |
621 | * bcm_rx_thr_handler - the time for blocked content updates is over now: | |
622 | * Check for throttled data and send it to the userspace | |
623 | */ | |
624 | static enum hrtimer_restart bcm_rx_thr_handler(struct hrtimer *hrtimer) | |
625 | { | |
626 | struct bcm_op *op = container_of(hrtimer, struct bcm_op, thrtimer); | |
627 | ||
bf74aa86 | 628 | if (bcm_rx_thr_flush(op)) { |
9b44a927 | 629 | hrtimer_forward_now(hrtimer, op->kt_ival2); |
73e87e02 OH |
630 | return HRTIMER_RESTART; |
631 | } else { | |
632 | /* rearm throttle handling */ | |
8b0e1953 | 633 | op->kt_lastmsg = 0; |
73e87e02 OH |
634 | return HRTIMER_NORESTART; |
635 | } | |
ffd980f9 OH |
636 | } |
637 | ||
638 | /* | |
069f8457 | 639 | * bcm_rx_handler - handle a CAN frame reception |
ffd980f9 OH |
640 | */ |
641 | static void bcm_rx_handler(struct sk_buff *skb, void *data) | |
642 | { | |
643 | struct bcm_op *op = (struct bcm_op *)data; | |
6f3b911d | 644 | const struct canfd_frame *rxframe = (struct canfd_frame *)skb->data; |
5b75c497 | 645 | unsigned int i; |
ffd980f9 | 646 | |
6e5c172c | 647 | if (op->can_id != rxframe->can_id) |
1fa17d4b | 648 | return; |
ffd980f9 | 649 | |
6f3b911d OH |
650 | /* make sure to handle the correct frame type (CAN / CAN FD) */ |
651 | if (skb->len != op->cfsiz) | |
652 | return; | |
653 | ||
654 | /* disable timeout */ | |
655 | hrtimer_cancel(&op->timer); | |
656 | ||
6e5c172c OH |
657 | /* save rx timestamp */ |
658 | op->rx_stamp = skb->tstamp; | |
659 | /* save originator for recvfrom() */ | |
660 | op->rx_ifindex = skb->dev->ifindex; | |
661 | /* update statistics */ | |
662 | op->frames_abs++; | |
ffd980f9 OH |
663 | |
664 | if (op->flags & RX_RTR_FRAME) { | |
665 | /* send reply for RTR-request (placed in op->frames[0]) */ | |
666 | bcm_can_tx(op); | |
1fa17d4b | 667 | return; |
ffd980f9 OH |
668 | } |
669 | ||
670 | if (op->flags & RX_FILTER_ID) { | |
671 | /* the easiest case */ | |
5499a6b2 | 672 | bcm_rx_update_and_send(op, op->last_frames, rxframe); |
1fa17d4b | 673 | goto rx_starttimer; |
ffd980f9 OH |
674 | } |
675 | ||
676 | if (op->nframes == 1) { | |
677 | /* simple compare with index 0 */ | |
6e5c172c | 678 | bcm_rx_cmp_to_index(op, 0, rxframe); |
1fa17d4b | 679 | goto rx_starttimer; |
ffd980f9 OH |
680 | } |
681 | ||
682 | if (op->nframes > 1) { | |
683 | /* | |
684 | * multiplex compare | |
685 | * | |
686 | * find the first multiplex mask that fits. | |
6f3b911d OH |
687 | * Remark: The MUX-mask is stored in index 0 - but only the |
688 | * first 64 bits of the frame data[] are relevant (CAN FD) | |
ffd980f9 OH |
689 | */ |
690 | ||
691 | for (i = 1; i < op->nframes; i++) { | |
6f3b911d OH |
692 | if ((get_u64(op->frames, 0) & get_u64(rxframe, 0)) == |
693 | (get_u64(op->frames, 0) & | |
694 | get_u64(op->frames + op->cfsiz * i, 0))) { | |
6e5c172c | 695 | bcm_rx_cmp_to_index(op, i, rxframe); |
ffd980f9 OH |
696 | break; |
697 | } | |
698 | } | |
ffd980f9 | 699 | } |
6e5c172c | 700 | |
1fa17d4b | 701 | rx_starttimer: |
6e5c172c | 702 | bcm_rx_starttimer(op); |
ffd980f9 OH |
703 | } |
704 | ||
705 | /* | |
706 | * helpers for bcm_op handling: find & delete bcm [rx|tx] op elements | |
707 | */ | |
2b5f5f5d OH |
708 | static struct bcm_op *bcm_find_op(struct list_head *ops, |
709 | struct bcm_msg_head *mh, int ifindex) | |
ffd980f9 OH |
710 | { |
711 | struct bcm_op *op; | |
712 | ||
713 | list_for_each_entry(op, ops, list) { | |
6f3b911d OH |
714 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
715 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) | |
ffd980f9 OH |
716 | return op; |
717 | } | |
718 | ||
719 | return NULL; | |
720 | } | |
721 | ||
f1b4e32a | 722 | static void bcm_free_op_rcu(struct rcu_head *rcu_head) |
ffd980f9 | 723 | { |
f1b4e32a | 724 | struct bcm_op *op = container_of(rcu_head, struct bcm_op, rcu); |
6e5c172c | 725 | |
ffd980f9 OH |
726 | if ((op->frames) && (op->frames != &op->sframe)) |
727 | kfree(op->frames); | |
728 | ||
729 | if ((op->last_frames) && (op->last_frames != &op->last_sframe)) | |
730 | kfree(op->last_frames); | |
731 | ||
732 | kfree(op); | |
ffd980f9 OH |
733 | } |
734 | ||
f1b4e32a OH |
735 | static void bcm_remove_op(struct bcm_op *op) |
736 | { | |
737 | hrtimer_cancel(&op->timer); | |
738 | hrtimer_cancel(&op->thrtimer); | |
739 | ||
740 | call_rcu(&op->rcu, bcm_free_op_rcu); | |
741 | } | |
742 | ||
ffd980f9 OH |
743 | static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op) |
744 | { | |
745 | if (op->rx_reg_dev == dev) { | |
384317ef | 746 | can_rx_unregister(dev_net(dev), dev, op->can_id, |
8e8cda6d | 747 | REGMASK(op->can_id), bcm_rx_handler, op); |
ffd980f9 OH |
748 | |
749 | /* mark as removed subscription */ | |
750 | op->rx_reg_dev = NULL; | |
751 | } else | |
752 | printk(KERN_ERR "can-bcm: bcm_rx_unreg: registered device " | |
753 | "mismatch %p %p\n", op->rx_reg_dev, dev); | |
754 | } | |
755 | ||
756 | /* | |
757 | * bcm_delete_rx_op - find and remove a rx op (returns number of removed ops) | |
758 | */ | |
2b5f5f5d OH |
759 | static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh, |
760 | int ifindex) | |
ffd980f9 OH |
761 | { |
762 | struct bcm_op *op, *n; | |
763 | ||
764 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
765 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
766 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 | 767 | |
f1b4e32a OH |
768 | /* disable automatic timer on frame reception */ |
769 | op->flags |= RX_NO_AUTOTIMER; | |
770 | ||
ffd980f9 OH |
771 | /* |
772 | * Don't care if we're bound or not (due to netdev | |
773 | * problems) can_rx_unregister() is always a save | |
774 | * thing to do here. | |
775 | */ | |
776 | if (op->ifindex) { | |
777 | /* | |
778 | * Only remove subscriptions that had not | |
779 | * been removed due to NETDEV_UNREGISTER | |
780 | * in bcm_notifier() | |
781 | */ | |
782 | if (op->rx_reg_dev) { | |
783 | struct net_device *dev; | |
784 | ||
384317ef | 785 | dev = dev_get_by_index(sock_net(op->sk), |
ffd980f9 OH |
786 | op->ifindex); |
787 | if (dev) { | |
788 | bcm_rx_unreg(dev, op); | |
789 | dev_put(dev); | |
790 | } | |
791 | } | |
792 | } else | |
384317ef OH |
793 | can_rx_unregister(sock_net(op->sk), NULL, |
794 | op->can_id, | |
ffd980f9 OH |
795 | REGMASK(op->can_id), |
796 | bcm_rx_handler, op); | |
797 | ||
798 | list_del(&op->list); | |
799 | bcm_remove_op(op); | |
800 | return 1; /* done */ | |
801 | } | |
802 | } | |
803 | ||
804 | return 0; /* not found */ | |
805 | } | |
806 | ||
807 | /* | |
808 | * bcm_delete_tx_op - find and remove a tx op (returns number of removed ops) | |
809 | */ | |
2b5f5f5d OH |
810 | static int bcm_delete_tx_op(struct list_head *ops, struct bcm_msg_head *mh, |
811 | int ifindex) | |
ffd980f9 OH |
812 | { |
813 | struct bcm_op *op, *n; | |
814 | ||
815 | list_for_each_entry_safe(op, n, ops, list) { | |
6f3b911d OH |
816 | if ((op->can_id == mh->can_id) && (op->ifindex == ifindex) && |
817 | (op->flags & CAN_FD_FRAME) == (mh->flags & CAN_FD_FRAME)) { | |
ffd980f9 OH |
818 | list_del(&op->list); |
819 | bcm_remove_op(op); | |
820 | return 1; /* done */ | |
821 | } | |
822 | } | |
823 | ||
824 | return 0; /* not found */ | |
825 | } | |
826 | ||
827 | /* | |
828 | * bcm_read_op - read out a bcm_op and send it to the user (for bcm_sendmsg) | |
829 | */ | |
830 | static int bcm_read_op(struct list_head *ops, struct bcm_msg_head *msg_head, | |
831 | int ifindex) | |
832 | { | |
2b5f5f5d | 833 | struct bcm_op *op = bcm_find_op(ops, msg_head, ifindex); |
ffd980f9 OH |
834 | |
835 | if (!op) | |
836 | return -EINVAL; | |
837 | ||
838 | /* put current values into msg_head */ | |
839 | msg_head->flags = op->flags; | |
840 | msg_head->count = op->count; | |
841 | msg_head->ival1 = op->ival1; | |
842 | msg_head->ival2 = op->ival2; | |
843 | msg_head->nframes = op->nframes; | |
844 | ||
845 | bcm_send_to_user(op, msg_head, op->frames, 0); | |
846 | ||
847 | return MHSIZ; | |
848 | } | |
849 | ||
850 | /* | |
851 | * bcm_tx_setup - create or update a bcm tx op (for bcm_sendmsg) | |
852 | */ | |
853 | static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
854 | int ifindex, struct sock *sk) | |
855 | { | |
856 | struct bcm_sock *bo = bcm_sk(sk); | |
857 | struct bcm_op *op; | |
6f3b911d | 858 | struct canfd_frame *cf; |
5b75c497 OH |
859 | unsigned int i; |
860 | int err; | |
ffd980f9 OH |
861 | |
862 | /* we need a real device to send frames */ | |
863 | if (!ifindex) | |
864 | return -ENODEV; | |
865 | ||
72c8a89a | 866 | /* check nframes boundaries - we need at least one CAN frame */ |
5b75c497 | 867 | if (msg_head->nframes < 1 || msg_head->nframes > MAX_NFRAMES) |
ffd980f9 OH |
868 | return -EINVAL; |
869 | ||
93171ba6 OH |
870 | /* check timeval limitations */ |
871 | if ((msg_head->flags & SETTIMER) && bcm_is_invalid_tv(msg_head)) | |
872 | return -EINVAL; | |
873 | ||
ffd980f9 | 874 | /* check the given can_id */ |
2b5f5f5d | 875 | op = bcm_find_op(&bo->tx_ops, msg_head, ifindex); |
ffd980f9 OH |
876 | if (op) { |
877 | /* update existing BCM operation */ | |
878 | ||
879 | /* | |
72c8a89a | 880 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
881 | * allocated? -> This is a _really_ unusual use-case and |
882 | * therefore (complexity / locking) it is not supported. | |
883 | */ | |
884 | if (msg_head->nframes > op->nframes) | |
885 | return -E2BIG; | |
886 | ||
72c8a89a | 887 | /* update CAN frames content */ |
ffd980f9 | 888 | for (i = 0; i < msg_head->nframes; i++) { |
7f2d38eb | 889 | |
6f3b911d OH |
890 | cf = op->frames + op->cfsiz * i; |
891 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
892 | ||
893 | if (op->flags & CAN_FD_FRAME) { | |
894 | if (cf->len > 64) | |
895 | err = -EINVAL; | |
896 | } else { | |
897 | if (cf->len > 8) | |
898 | err = -EINVAL; | |
899 | } | |
7f2d38eb | 900 | |
ffd980f9 OH |
901 | if (err < 0) |
902 | return err; | |
903 | ||
904 | if (msg_head->flags & TX_CP_CAN_ID) { | |
905 | /* copy can_id into frame */ | |
6f3b911d | 906 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
907 | } |
908 | } | |
6f3b911d | 909 | op->flags = msg_head->flags; |
ffd980f9 OH |
910 | |
911 | } else { | |
912 | /* insert new BCM operation for the given can_id */ | |
913 | ||
914 | op = kzalloc(OPSIZ, GFP_KERNEL); | |
915 | if (!op) | |
916 | return -ENOMEM; | |
917 | ||
6f3b911d OH |
918 | op->can_id = msg_head->can_id; |
919 | op->cfsiz = CFSIZ(msg_head->flags); | |
920 | op->flags = msg_head->flags; | |
ffd980f9 | 921 | |
72c8a89a | 922 | /* create array for CAN frames and copy the data */ |
ffd980f9 | 923 | if (msg_head->nframes > 1) { |
6da2ec56 KC |
924 | op->frames = kmalloc_array(msg_head->nframes, |
925 | op->cfsiz, | |
926 | GFP_KERNEL); | |
ffd980f9 OH |
927 | if (!op->frames) { |
928 | kfree(op); | |
929 | return -ENOMEM; | |
930 | } | |
931 | } else | |
932 | op->frames = &op->sframe; | |
933 | ||
934 | for (i = 0; i < msg_head->nframes; i++) { | |
7f2d38eb | 935 | |
6f3b911d OH |
936 | cf = op->frames + op->cfsiz * i; |
937 | err = memcpy_from_msg((u8 *)cf, msg, op->cfsiz); | |
938 | ||
939 | if (op->flags & CAN_FD_FRAME) { | |
940 | if (cf->len > 64) | |
941 | err = -EINVAL; | |
942 | } else { | |
943 | if (cf->len > 8) | |
944 | err = -EINVAL; | |
945 | } | |
7f2d38eb | 946 | |
ffd980f9 OH |
947 | if (err < 0) { |
948 | if (op->frames != &op->sframe) | |
949 | kfree(op->frames); | |
950 | kfree(op); | |
951 | return err; | |
952 | } | |
953 | ||
954 | if (msg_head->flags & TX_CP_CAN_ID) { | |
955 | /* copy can_id into frame */ | |
6f3b911d | 956 | cf->can_id = msg_head->can_id; |
ffd980f9 OH |
957 | } |
958 | } | |
959 | ||
960 | /* tx_ops never compare with previous received messages */ | |
961 | op->last_frames = NULL; | |
962 | ||
963 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
964 | op->sk = sk; | |
965 | op->ifindex = ifindex; | |
966 | ||
967 | /* initialize uninitialized (kzalloc) structure */ | |
bf74aa86 TG |
968 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, |
969 | HRTIMER_MODE_REL_SOFT); | |
73e87e02 | 970 | op->timer.function = bcm_tx_timeout_handler; |
ffd980f9 OH |
971 | |
972 | /* currently unused in tx_ops */ | |
bf74aa86 TG |
973 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, |
974 | HRTIMER_MODE_REL_SOFT); | |
ffd980f9 OH |
975 | |
976 | /* add this bcm_op to the list of the tx_ops */ | |
977 | list_add(&op->list, &bo->tx_ops); | |
978 | ||
979 | } /* if ((op = bcm_find_op(&bo->tx_ops, msg_head->can_id, ifindex))) */ | |
980 | ||
981 | if (op->nframes != msg_head->nframes) { | |
982 | op->nframes = msg_head->nframes; | |
983 | /* start multiple frame transmission with index 0 */ | |
984 | op->currframe = 0; | |
985 | } | |
986 | ||
987 | /* check flags */ | |
988 | ||
ffd980f9 OH |
989 | if (op->flags & TX_RESET_MULTI_IDX) { |
990 | /* start multiple frame transmission with index 0 */ | |
991 | op->currframe = 0; | |
992 | } | |
993 | ||
994 | if (op->flags & SETTIMER) { | |
995 | /* set timer values */ | |
996 | op->count = msg_head->count; | |
997 | op->ival1 = msg_head->ival1; | |
998 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
999 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1000 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1001 | |
1002 | /* disable an active timer due to zero values? */ | |
2456e855 | 1003 | if (!op->kt_ival1 && !op->kt_ival2) |
73e87e02 | 1004 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1005 | } |
1006 | ||
12d0d0d3 OH |
1007 | if (op->flags & STARTTIMER) { |
1008 | hrtimer_cancel(&op->timer); | |
72c8a89a | 1009 | /* spec: send CAN frame when starting timer */ |
ffd980f9 | 1010 | op->flags |= TX_ANNOUNCE; |
ffd980f9 OH |
1011 | } |
1012 | ||
aabdcb0b | 1013 | if (op->flags & TX_ANNOUNCE) { |
ffd980f9 | 1014 | bcm_can_tx(op); |
12d0d0d3 | 1015 | if (op->count) |
aabdcb0b OH |
1016 | op->count--; |
1017 | } | |
ffd980f9 | 1018 | |
12d0d0d3 OH |
1019 | if (op->flags & STARTTIMER) |
1020 | bcm_tx_start_timer(op); | |
1021 | ||
6f3b911d | 1022 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1023 | } |
1024 | ||
1025 | /* | |
1026 | * bcm_rx_setup - create or update a bcm rx op (for bcm_sendmsg) | |
1027 | */ | |
1028 | static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg, | |
1029 | int ifindex, struct sock *sk) | |
1030 | { | |
1031 | struct bcm_sock *bo = bcm_sk(sk); | |
1032 | struct bcm_op *op; | |
1033 | int do_rx_register; | |
1034 | int err = 0; | |
1035 | ||
1036 | if ((msg_head->flags & RX_FILTER_ID) || (!(msg_head->nframes))) { | |
1037 | /* be robust against wrong usage ... */ | |
1038 | msg_head->flags |= RX_FILTER_ID; | |
1039 | /* ignore trailing garbage */ | |
1040 | msg_head->nframes = 0; | |
1041 | } | |
1042 | ||
5b75c497 OH |
1043 | /* the first element contains the mux-mask => MAX_NFRAMES + 1 */ |
1044 | if (msg_head->nframes > MAX_NFRAMES + 1) | |
1045 | return -EINVAL; | |
1046 | ||
ffd980f9 OH |
1047 | if ((msg_head->flags & RX_RTR_FRAME) && |
1048 | ((msg_head->nframes != 1) || | |
1049 | (!(msg_head->can_id & CAN_RTR_FLAG)))) | |
1050 | return -EINVAL; | |
1051 | ||
93171ba6 OH |
1052 | /* check timeval limitations */ |
1053 | if ((msg_head->flags & SETTIMER) && bcm_is_invalid_tv(msg_head)) | |
1054 | return -EINVAL; | |
1055 | ||
ffd980f9 | 1056 | /* check the given can_id */ |
2b5f5f5d | 1057 | op = bcm_find_op(&bo->rx_ops, msg_head, ifindex); |
ffd980f9 OH |
1058 | if (op) { |
1059 | /* update existing BCM operation */ | |
1060 | ||
1061 | /* | |
72c8a89a | 1062 | * Do we need more space for the CAN frames than currently |
ffd980f9 OH |
1063 | * 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) { | |
72c8a89a | 1070 | /* update CAN frames content */ |
5499a6b2 | 1071 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1072 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1073 | if (err < 0) |
1074 | return err; | |
1075 | ||
1076 | /* clear last_frames to indicate 'nothing received' */ | |
6f3b911d | 1077 | memset(op->last_frames, 0, msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1078 | } |
1079 | ||
1080 | op->nframes = msg_head->nframes; | |
6f3b911d | 1081 | op->flags = msg_head->flags; |
ffd980f9 OH |
1082 | |
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 | ||
6f3b911d OH |
1092 | 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; | |
ffd980f9 OH |
1096 | |
1097 | if (msg_head->nframes > 1) { | |
72c8a89a | 1098 | /* create array for CAN frames and copy the data */ |
6da2ec56 KC |
1099 | op->frames = kmalloc_array(msg_head->nframes, |
1100 | op->cfsiz, | |
1101 | GFP_KERNEL); | |
ffd980f9 OH |
1102 | if (!op->frames) { |
1103 | kfree(op); | |
1104 | return -ENOMEM; | |
1105 | } | |
1106 | ||
72c8a89a | 1107 | /* create and init array for received CAN frames */ |
6396bb22 KC |
1108 | op->last_frames = kcalloc(msg_head->nframes, |
1109 | op->cfsiz, | |
ffd980f9 OH |
1110 | GFP_KERNEL); |
1111 | if (!op->last_frames) { | |
1112 | kfree(op->frames); | |
1113 | kfree(op); | |
1114 | return -ENOMEM; | |
1115 | } | |
1116 | ||
1117 | } else { | |
1118 | op->frames = &op->sframe; | |
1119 | op->last_frames = &op->last_sframe; | |
1120 | } | |
1121 | ||
1122 | if (msg_head->nframes) { | |
5499a6b2 | 1123 | err = memcpy_from_msg(op->frames, msg, |
6f3b911d | 1124 | msg_head->nframes * op->cfsiz); |
ffd980f9 OH |
1125 | if (err < 0) { |
1126 | if (op->frames != &op->sframe) | |
1127 | kfree(op->frames); | |
1128 | if (op->last_frames != &op->last_sframe) | |
1129 | kfree(op->last_frames); | |
1130 | kfree(op); | |
1131 | return err; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | /* bcm_can_tx / bcm_tx_timeout_handler needs this */ | |
1136 | op->sk = sk; | |
1137 | op->ifindex = ifindex; | |
1138 | ||
81b40110 OH |
1139 | /* ifindex for timeout events w/o previous frame reception */ |
1140 | op->rx_ifindex = ifindex; | |
1141 | ||
ffd980f9 | 1142 | /* initialize uninitialized (kzalloc) structure */ |
bf74aa86 TG |
1143 | hrtimer_init(&op->timer, CLOCK_MONOTONIC, |
1144 | HRTIMER_MODE_REL_SOFT); | |
73e87e02 | 1145 | op->timer.function = bcm_rx_timeout_handler; |
ffd980f9 | 1146 | |
bf74aa86 TG |
1147 | hrtimer_init(&op->thrtimer, CLOCK_MONOTONIC, |
1148 | HRTIMER_MODE_REL_SOFT); | |
73e87e02 | 1149 | op->thrtimer.function = bcm_rx_thr_handler; |
ffd980f9 OH |
1150 | |
1151 | /* add this bcm_op to the list of the rx_ops */ | |
1152 | list_add(&op->list, &bo->rx_ops); | |
1153 | ||
1154 | /* call can_rx_register() */ | |
1155 | do_rx_register = 1; | |
1156 | ||
1157 | } /* if ((op = bcm_find_op(&bo->rx_ops, msg_head->can_id, ifindex))) */ | |
1158 | ||
1159 | /* check flags */ | |
ffd980f9 OH |
1160 | |
1161 | if (op->flags & RX_RTR_FRAME) { | |
5499a6b2 | 1162 | struct canfd_frame *frame0 = op->frames; |
ffd980f9 OH |
1163 | |
1164 | /* no timers in RTR-mode */ | |
73e87e02 OH |
1165 | hrtimer_cancel(&op->thrtimer); |
1166 | hrtimer_cancel(&op->timer); | |
ffd980f9 OH |
1167 | |
1168 | /* | |
1169 | * funny feature in RX(!)_SETUP only for RTR-mode: | |
1170 | * copy can_id into frame BUT without RTR-flag to | |
1171 | * prevent a full-load-loopback-test ... ;-] | |
1172 | */ | |
1173 | if ((op->flags & TX_CP_CAN_ID) || | |
5499a6b2 OH |
1174 | (frame0->can_id == op->can_id)) |
1175 | frame0->can_id = op->can_id & ~CAN_RTR_FLAG; | |
ffd980f9 OH |
1176 | |
1177 | } else { | |
1178 | if (op->flags & SETTIMER) { | |
1179 | ||
1180 | /* set timer value */ | |
1181 | op->ival1 = msg_head->ival1; | |
1182 | op->ival2 = msg_head->ival2; | |
ba61a8d9 AB |
1183 | op->kt_ival1 = bcm_timeval_to_ktime(msg_head->ival1); |
1184 | op->kt_ival2 = bcm_timeval_to_ktime(msg_head->ival2); | |
ffd980f9 OH |
1185 | |
1186 | /* disable an active timer due to zero value? */ | |
2456e855 | 1187 | if (!op->kt_ival1) |
73e87e02 | 1188 | hrtimer_cancel(&op->timer); |
ffd980f9 OH |
1189 | |
1190 | /* | |
73e87e02 OH |
1191 | * In any case cancel the throttle timer, flush |
1192 | * potentially blocked msgs and reset throttle handling | |
ffd980f9 | 1193 | */ |
8b0e1953 | 1194 | op->kt_lastmsg = 0; |
73e87e02 | 1195 | hrtimer_cancel(&op->thrtimer); |
bf74aa86 | 1196 | bcm_rx_thr_flush(op); |
ffd980f9 OH |
1197 | } |
1198 | ||
2456e855 | 1199 | if ((op->flags & STARTTIMER) && op->kt_ival1) |
73e87e02 | 1200 | hrtimer_start(&op->timer, op->kt_ival1, |
bf74aa86 | 1201 | HRTIMER_MODE_REL_SOFT); |
ffd980f9 OH |
1202 | } |
1203 | ||
1204 | /* now we can register for can_ids, if we added a new bcm_op */ | |
1205 | if (do_rx_register) { | |
1206 | if (ifindex) { | |
1207 | struct net_device *dev; | |
1208 | ||
384317ef | 1209 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 | 1210 | if (dev) { |
384317ef | 1211 | err = can_rx_register(sock_net(sk), dev, |
8e8cda6d | 1212 | op->can_id, |
ffd980f9 OH |
1213 | REGMASK(op->can_id), |
1214 | bcm_rx_handler, op, | |
f1712c73 | 1215 | "bcm", sk); |
ffd980f9 OH |
1216 | |
1217 | op->rx_reg_dev = dev; | |
1218 | dev_put(dev); | |
1219 | } | |
1220 | ||
1221 | } else | |
384317ef | 1222 | err = can_rx_register(sock_net(sk), NULL, op->can_id, |
ffd980f9 | 1223 | REGMASK(op->can_id), |
f1712c73 | 1224 | bcm_rx_handler, op, "bcm", sk); |
ffd980f9 OH |
1225 | if (err) { |
1226 | /* this bcm rx op is broken -> remove it */ | |
1227 | list_del(&op->list); | |
1228 | bcm_remove_op(op); | |
1229 | return err; | |
1230 | } | |
1231 | } | |
1232 | ||
6f3b911d | 1233 | return msg_head->nframes * op->cfsiz + MHSIZ; |
ffd980f9 OH |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * bcm_tx_send - send a single CAN frame to the CAN interface (for bcm_sendmsg) | |
1238 | */ | |
2b5f5f5d OH |
1239 | static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk, |
1240 | int cfsiz) | |
ffd980f9 OH |
1241 | { |
1242 | struct sk_buff *skb; | |
1243 | struct net_device *dev; | |
1244 | int err; | |
1245 | ||
1246 | /* we need a real device to send frames */ | |
1247 | if (!ifindex) | |
1248 | return -ENODEV; | |
1249 | ||
2b5f5f5d | 1250 | skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL); |
ffd980f9 OH |
1251 | if (!skb) |
1252 | return -ENOMEM; | |
1253 | ||
2bf3440d | 1254 | can_skb_reserve(skb); |
156c2bb9 | 1255 | |
2b5f5f5d | 1256 | err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz); |
ffd980f9 OH |
1257 | if (err < 0) { |
1258 | kfree_skb(skb); | |
1259 | return err; | |
1260 | } | |
1261 | ||
384317ef | 1262 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 OH |
1263 | if (!dev) { |
1264 | kfree_skb(skb); | |
1265 | return -ENODEV; | |
1266 | } | |
1267 | ||
2bf3440d | 1268 | can_skb_prv(skb)->ifindex = dev->ifindex; |
d3b58c47 | 1269 | can_skb_prv(skb)->skbcnt = 0; |
ffd980f9 | 1270 | skb->dev = dev; |
0ae89beb | 1271 | can_skb_set_owner(skb, sk); |
7f2d38eb | 1272 | err = can_send(skb, 1); /* send with loopback */ |
ffd980f9 OH |
1273 | dev_put(dev); |
1274 | ||
7f2d38eb OH |
1275 | if (err) |
1276 | return err; | |
1277 | ||
2b5f5f5d | 1278 | return cfsiz + MHSIZ; |
ffd980f9 OH |
1279 | } |
1280 | ||
1281 | /* | |
1282 | * bcm_sendmsg - process BCM commands (opcodes) from the userspace | |
1283 | */ | |
1b784140 | 1284 | static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
ffd980f9 OH |
1285 | { |
1286 | struct sock *sk = sock->sk; | |
1287 | struct bcm_sock *bo = bcm_sk(sk); | |
1288 | int ifindex = bo->ifindex; /* default ifindex for this bcm_op */ | |
1289 | struct bcm_msg_head msg_head; | |
6f3b911d | 1290 | int cfsiz; |
ffd980f9 OH |
1291 | int ret; /* read bytes or error codes as return value */ |
1292 | ||
1293 | if (!bo->bound) | |
1294 | return -ENOTCONN; | |
1295 | ||
7f2d38eb | 1296 | /* check for valid message length from userspace */ |
2b5f5f5d OH |
1297 | if (size < MHSIZ) |
1298 | return -EINVAL; | |
1299 | ||
1300 | /* read message head information */ | |
1301 | ret = memcpy_from_msg((u8 *)&msg_head, msg, MHSIZ); | |
1302 | if (ret < 0) | |
1303 | return ret; | |
1304 | ||
6f3b911d OH |
1305 | cfsiz = CFSIZ(msg_head.flags); |
1306 | if ((size - MHSIZ) % cfsiz) | |
7f2d38eb OH |
1307 | return -EINVAL; |
1308 | ||
ffd980f9 OH |
1309 | /* check for alternative ifindex for this bcm_op */ |
1310 | ||
1311 | if (!ifindex && msg->msg_name) { | |
1312 | /* no bound device as default => check msg_name */ | |
342dfc30 | 1313 | DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name); |
ffd980f9 | 1314 | |
9e971474 | 1315 | if (msg->msg_namelen < BCM_MIN_NAMELEN) |
5e507328 KVD |
1316 | return -EINVAL; |
1317 | ||
ffd980f9 OH |
1318 | if (addr->can_family != AF_CAN) |
1319 | return -EINVAL; | |
1320 | ||
1321 | /* ifindex from sendto() */ | |
1322 | ifindex = addr->can_ifindex; | |
1323 | ||
1324 | if (ifindex) { | |
1325 | struct net_device *dev; | |
1326 | ||
384317ef | 1327 | dev = dev_get_by_index(sock_net(sk), ifindex); |
ffd980f9 OH |
1328 | if (!dev) |
1329 | return -ENODEV; | |
1330 | ||
1331 | if (dev->type != ARPHRD_CAN) { | |
1332 | dev_put(dev); | |
1333 | return -ENODEV; | |
1334 | } | |
1335 | ||
1336 | dev_put(dev); | |
1337 | } | |
1338 | } | |
1339 | ||
ffd980f9 OH |
1340 | lock_sock(sk); |
1341 | ||
1342 | switch (msg_head.opcode) { | |
1343 | ||
1344 | case TX_SETUP: | |
1345 | ret = bcm_tx_setup(&msg_head, msg, ifindex, sk); | |
1346 | break; | |
1347 | ||
1348 | case RX_SETUP: | |
1349 | ret = bcm_rx_setup(&msg_head, msg, ifindex, sk); | |
1350 | break; | |
1351 | ||
1352 | case TX_DELETE: | |
2b5f5f5d | 1353 | if (bcm_delete_tx_op(&bo->tx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1354 | ret = MHSIZ; |
1355 | else | |
1356 | ret = -EINVAL; | |
1357 | break; | |
1358 | ||
1359 | case RX_DELETE: | |
2b5f5f5d | 1360 | if (bcm_delete_rx_op(&bo->rx_ops, &msg_head, ifindex)) |
ffd980f9 OH |
1361 | ret = MHSIZ; |
1362 | else | |
1363 | ret = -EINVAL; | |
1364 | break; | |
1365 | ||
1366 | case TX_READ: | |
1367 | /* reuse msg_head for the reply to TX_READ */ | |
1368 | msg_head.opcode = TX_STATUS; | |
1369 | ret = bcm_read_op(&bo->tx_ops, &msg_head, ifindex); | |
1370 | break; | |
1371 | ||
1372 | case RX_READ: | |
1373 | /* reuse msg_head for the reply to RX_READ */ | |
1374 | msg_head.opcode = RX_STATUS; | |
1375 | ret = bcm_read_op(&bo->rx_ops, &msg_head, ifindex); | |
1376 | break; | |
1377 | ||
1378 | case TX_SEND: | |
72c8a89a | 1379 | /* we need exactly one CAN frame behind the msg head */ |
6f3b911d | 1380 | if ((msg_head.nframes != 1) || (size != cfsiz + MHSIZ)) |
ffd980f9 OH |
1381 | ret = -EINVAL; |
1382 | else | |
6f3b911d | 1383 | ret = bcm_tx_send(msg, ifindex, sk, cfsiz); |
ffd980f9 OH |
1384 | break; |
1385 | ||
1386 | default: | |
1387 | ret = -EINVAL; | |
1388 | break; | |
1389 | } | |
1390 | ||
1391 | release_sock(sk); | |
1392 | ||
1393 | return ret; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * notification handler for netdevice status changes | |
1398 | */ | |
8d0caedb TH |
1399 | static void bcm_notify(struct bcm_sock *bo, unsigned long msg, |
1400 | struct net_device *dev) | |
ffd980f9 | 1401 | { |
ffd980f9 OH |
1402 | struct sock *sk = &bo->sk; |
1403 | struct bcm_op *op; | |
1404 | int notify_enodev = 0; | |
1405 | ||
384317ef | 1406 | if (!net_eq(dev_net(dev), sock_net(sk))) |
8d0caedb | 1407 | return; |
ffd980f9 OH |
1408 | |
1409 | switch (msg) { | |
1410 | ||
1411 | case NETDEV_UNREGISTER: | |
1412 | lock_sock(sk); | |
1413 | ||
1414 | /* remove device specific receive entries */ | |
1415 | list_for_each_entry(op, &bo->rx_ops, list) | |
1416 | if (op->rx_reg_dev == dev) | |
1417 | bcm_rx_unreg(dev, op); | |
1418 | ||
1419 | /* remove device reference, if this is our bound device */ | |
1420 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1421 | bo->bound = 0; | |
1422 | bo->ifindex = 0; | |
1423 | notify_enodev = 1; | |
1424 | } | |
1425 | ||
1426 | release_sock(sk); | |
1427 | ||
1428 | if (notify_enodev) { | |
1429 | sk->sk_err = ENODEV; | |
1430 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1431 | sk_error_report(sk); |
ffd980f9 OH |
1432 | } |
1433 | break; | |
1434 | ||
1435 | case NETDEV_DOWN: | |
1436 | if (bo->bound && bo->ifindex == dev->ifindex) { | |
1437 | sk->sk_err = ENETDOWN; | |
1438 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1439 | sk_error_report(sk); |
ffd980f9 OH |
1440 | } |
1441 | } | |
8d0caedb | 1442 | } |
ffd980f9 | 1443 | |
8d0caedb TH |
1444 | static int bcm_notifier(struct notifier_block *nb, unsigned long msg, |
1445 | void *ptr) | |
1446 | { | |
1447 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1448 | ||
1449 | if (dev->type != ARPHRD_CAN) | |
1450 | return NOTIFY_DONE; | |
1451 | if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN) | |
1452 | return NOTIFY_DONE; | |
1453 | if (unlikely(bcm_busy_notifier)) /* Check for reentrant bug. */ | |
1454 | return NOTIFY_DONE; | |
1455 | ||
1456 | spin_lock(&bcm_notifier_lock); | |
1457 | list_for_each_entry(bcm_busy_notifier, &bcm_notifier_list, notifier) { | |
1458 | spin_unlock(&bcm_notifier_lock); | |
1459 | bcm_notify(bcm_busy_notifier, msg, dev); | |
1460 | spin_lock(&bcm_notifier_lock); | |
1461 | } | |
1462 | bcm_busy_notifier = NULL; | |
1463 | spin_unlock(&bcm_notifier_lock); | |
ffd980f9 OH |
1464 | return NOTIFY_DONE; |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * initial settings for all BCM sockets to be set at socket creation time | |
1469 | */ | |
1470 | static int bcm_init(struct sock *sk) | |
1471 | { | |
1472 | struct bcm_sock *bo = bcm_sk(sk); | |
1473 | ||
1474 | bo->bound = 0; | |
1475 | bo->ifindex = 0; | |
1476 | bo->dropped_usr_msgs = 0; | |
1477 | bo->bcm_proc_read = NULL; | |
1478 | ||
1479 | INIT_LIST_HEAD(&bo->tx_ops); | |
1480 | INIT_LIST_HEAD(&bo->rx_ops); | |
1481 | ||
1482 | /* set notifier */ | |
8d0caedb TH |
1483 | spin_lock(&bcm_notifier_lock); |
1484 | list_add_tail(&bo->notifier, &bcm_notifier_list); | |
1485 | spin_unlock(&bcm_notifier_lock); | |
ffd980f9 OH |
1486 | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * standard socket functions | |
1492 | */ | |
1493 | static int bcm_release(struct socket *sock) | |
1494 | { | |
1495 | struct sock *sk = sock->sk; | |
62c04647 | 1496 | struct net *net; |
c6914a6f | 1497 | struct bcm_sock *bo; |
ffd980f9 OH |
1498 | struct bcm_op *op, *next; |
1499 | ||
62c04647 | 1500 | if (!sk) |
c6914a6f DJ |
1501 | return 0; |
1502 | ||
62c04647 | 1503 | net = sock_net(sk); |
c6914a6f DJ |
1504 | bo = bcm_sk(sk); |
1505 | ||
ffd980f9 OH |
1506 | /* remove bcm_ops, timer, rx_unregister(), etc. */ |
1507 | ||
8d0caedb TH |
1508 | spin_lock(&bcm_notifier_lock); |
1509 | while (bcm_busy_notifier == bo) { | |
1510 | spin_unlock(&bcm_notifier_lock); | |
1511 | schedule_timeout_uninterruptible(1); | |
1512 | spin_lock(&bcm_notifier_lock); | |
1513 | } | |
1514 | list_del(&bo->notifier); | |
1515 | spin_unlock(&bcm_notifier_lock); | |
ffd980f9 OH |
1516 | |
1517 | lock_sock(sk); | |
1518 | ||
1519 | list_for_each_entry_safe(op, next, &bo->tx_ops, list) | |
1520 | bcm_remove_op(op); | |
1521 | ||
1522 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) { | |
1523 | /* | |
1524 | * Don't care if we're bound or not (due to netdev problems) | |
1525 | * can_rx_unregister() is always a save thing to do here. | |
1526 | */ | |
1527 | if (op->ifindex) { | |
1528 | /* | |
1529 | * Only remove subscriptions that had not | |
1530 | * been removed due to NETDEV_UNREGISTER | |
1531 | * in bcm_notifier() | |
1532 | */ | |
1533 | if (op->rx_reg_dev) { | |
1534 | struct net_device *dev; | |
1535 | ||
384317ef | 1536 | dev = dev_get_by_index(net, op->ifindex); |
ffd980f9 OH |
1537 | if (dev) { |
1538 | bcm_rx_unreg(dev, op); | |
1539 | dev_put(dev); | |
1540 | } | |
1541 | } | |
1542 | } else | |
384317ef | 1543 | can_rx_unregister(net, NULL, op->can_id, |
ffd980f9 OH |
1544 | REGMASK(op->can_id), |
1545 | bcm_rx_handler, op); | |
1546 | ||
ffd980f9 OH |
1547 | } |
1548 | ||
d5f9023f TLSC |
1549 | synchronize_rcu(); |
1550 | ||
1551 | list_for_each_entry_safe(op, next, &bo->rx_ops, list) | |
1552 | bcm_remove_op(op); | |
1553 | ||
c2701b37 | 1554 | #if IS_ENABLED(CONFIG_PROC_FS) |
ffd980f9 | 1555 | /* remove procfs entry */ |
384317ef OH |
1556 | if (net->can.bcmproc_dir && bo->bcm_proc_read) |
1557 | remove_proc_entry(bo->procname, net->can.bcmproc_dir); | |
c2701b37 | 1558 | #endif /* CONFIG_PROC_FS */ |
ffd980f9 OH |
1559 | |
1560 | /* remove device reference */ | |
1561 | if (bo->bound) { | |
1562 | bo->bound = 0; | |
1563 | bo->ifindex = 0; | |
1564 | } | |
1565 | ||
f7e5cc0c LW |
1566 | sock_orphan(sk); |
1567 | sock->sk = NULL; | |
1568 | ||
ffd980f9 OH |
1569 | release_sock(sk); |
1570 | sock_put(sk); | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len, | |
1576 | int flags) | |
1577 | { | |
1578 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1579 | struct sock *sk = sock->sk; | |
1580 | struct bcm_sock *bo = bcm_sk(sk); | |
384317ef | 1581 | struct net *net = sock_net(sk); |
deb507f9 | 1582 | int ret = 0; |
ffd980f9 | 1583 | |
9e971474 | 1584 | if (len < BCM_MIN_NAMELEN) |
6503d961 CG |
1585 | return -EINVAL; |
1586 | ||
deb507f9 OH |
1587 | lock_sock(sk); |
1588 | ||
1589 | if (bo->bound) { | |
1590 | ret = -EISCONN; | |
1591 | goto fail; | |
1592 | } | |
ffd980f9 OH |
1593 | |
1594 | /* bind a device to this socket */ | |
1595 | if (addr->can_ifindex) { | |
1596 | struct net_device *dev; | |
1597 | ||
384317ef | 1598 | dev = dev_get_by_index(net, addr->can_ifindex); |
deb507f9 OH |
1599 | if (!dev) { |
1600 | ret = -ENODEV; | |
1601 | goto fail; | |
1602 | } | |
ffd980f9 OH |
1603 | if (dev->type != ARPHRD_CAN) { |
1604 | dev_put(dev); | |
deb507f9 OH |
1605 | ret = -ENODEV; |
1606 | goto fail; | |
ffd980f9 OH |
1607 | } |
1608 | ||
1609 | bo->ifindex = dev->ifindex; | |
1610 | dev_put(dev); | |
1611 | ||
1612 | } else { | |
1613 | /* no interface reference for ifindex = 0 ('any' CAN device) */ | |
1614 | bo->ifindex = 0; | |
1615 | } | |
1616 | ||
c2701b37 | 1617 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1618 | if (net->can.bcmproc_dir) { |
ffd980f9 | 1619 | /* unique socket address as filename */ |
9f260e0e | 1620 | sprintf(bo->procname, "%lu", sock_i_ino(sk)); |
3617d949 | 1621 | bo->bcm_proc_read = proc_create_net_single(bo->procname, 0644, |
384317ef | 1622 | net->can.bcmproc_dir, |
3617d949 | 1623 | bcm_proc_show, sk); |
deb507f9 OH |
1624 | if (!bo->bcm_proc_read) { |
1625 | ret = -ENOMEM; | |
1626 | goto fail; | |
1627 | } | |
ffd980f9 | 1628 | } |
c2701b37 | 1629 | #endif /* CONFIG_PROC_FS */ |
ffd980f9 | 1630 | |
deb507f9 OH |
1631 | bo->bound = 1; |
1632 | ||
1633 | fail: | |
1634 | release_sock(sk); | |
1635 | ||
1636 | return ret; | |
ffd980f9 OH |
1637 | } |
1638 | ||
1b784140 YX |
1639 | static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
1640 | int flags) | |
ffd980f9 OH |
1641 | { |
1642 | struct sock *sk = sock->sk; | |
1643 | struct sk_buff *skb; | |
1644 | int error = 0; | |
ffd980f9 OH |
1645 | int err; |
1646 | ||
f4b41f06 | 1647 | skb = skb_recv_datagram(sk, flags, &error); |
ffd980f9 OH |
1648 | if (!skb) |
1649 | return error; | |
1650 | ||
1651 | if (skb->len < size) | |
1652 | size = skb->len; | |
1653 | ||
7eab8d9e | 1654 | err = memcpy_to_msg(msg, skb->data, size); |
ffd980f9 OH |
1655 | if (err < 0) { |
1656 | skb_free_datagram(sk, skb); | |
1657 | return err; | |
1658 | } | |
1659 | ||
6fd1d51c | 1660 | sock_recv_cmsgs(msg, sk, skb); |
ffd980f9 OH |
1661 | |
1662 | if (msg->msg_name) { | |
9e971474 OH |
1663 | __sockaddr_check_size(BCM_MIN_NAMELEN); |
1664 | msg->msg_namelen = BCM_MIN_NAMELEN; | |
ffd980f9 OH |
1665 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
1666 | } | |
1667 | ||
1668 | skb_free_datagram(sk, skb); | |
1669 | ||
1670 | return size; | |
1671 | } | |
1672 | ||
9989f633 MKB |
1673 | static int bcm_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd, |
1674 | unsigned long arg) | |
473d924d OH |
1675 | { |
1676 | /* no ioctls for socket layer -> hand it down to NIC layer */ | |
1677 | return -ENOIOCTLCMD; | |
1678 | } | |
1679 | ||
53914b67 | 1680 | static const struct proto_ops bcm_ops = { |
ffd980f9 OH |
1681 | .family = PF_CAN, |
1682 | .release = bcm_release, | |
1683 | .bind = sock_no_bind, | |
1684 | .connect = bcm_connect, | |
1685 | .socketpair = sock_no_socketpair, | |
1686 | .accept = sock_no_accept, | |
1687 | .getname = sock_no_getname, | |
a11e1d43 | 1688 | .poll = datagram_poll, |
473d924d | 1689 | .ioctl = bcm_sock_no_ioctlcmd, |
c7cbdbf2 | 1690 | .gettstamp = sock_gettstamp, |
ffd980f9 OH |
1691 | .listen = sock_no_listen, |
1692 | .shutdown = sock_no_shutdown, | |
ffd980f9 OH |
1693 | .sendmsg = bcm_sendmsg, |
1694 | .recvmsg = bcm_recvmsg, | |
1695 | .mmap = sock_no_mmap, | |
1696 | .sendpage = sock_no_sendpage, | |
1697 | }; | |
1698 | ||
1699 | static struct proto bcm_proto __read_mostly = { | |
1700 | .name = "CAN_BCM", | |
1701 | .owner = THIS_MODULE, | |
1702 | .obj_size = sizeof(struct bcm_sock), | |
1703 | .init = bcm_init, | |
1704 | }; | |
1705 | ||
1650629d | 1706 | static const struct can_proto bcm_can_proto = { |
ffd980f9 OH |
1707 | .type = SOCK_DGRAM, |
1708 | .protocol = CAN_BCM, | |
ffd980f9 OH |
1709 | .ops = &bcm_ops, |
1710 | .prot = &bcm_proto, | |
1711 | }; | |
1712 | ||
384317ef OH |
1713 | static int canbcm_pernet_init(struct net *net) |
1714 | { | |
c2701b37 | 1715 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1716 | /* create /proc/net/can-bcm directory */ |
c2701b37 OH |
1717 | net->can.bcmproc_dir = proc_net_mkdir(net, "can-bcm", net->proc_net); |
1718 | #endif /* CONFIG_PROC_FS */ | |
384317ef OH |
1719 | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static void canbcm_pernet_exit(struct net *net) | |
1724 | { | |
c2701b37 | 1725 | #if IS_ENABLED(CONFIG_PROC_FS) |
384317ef | 1726 | /* remove /proc/net/can-bcm directory */ |
c2701b37 OH |
1727 | if (net->can.bcmproc_dir) |
1728 | remove_proc_entry("can-bcm", net->proc_net); | |
1729 | #endif /* CONFIG_PROC_FS */ | |
384317ef OH |
1730 | } |
1731 | ||
1732 | static struct pernet_operations canbcm_pernet_ops __read_mostly = { | |
1733 | .init = canbcm_pernet_init, | |
1734 | .exit = canbcm_pernet_exit, | |
1735 | }; | |
1736 | ||
8d0caedb TH |
1737 | static struct notifier_block canbcm_notifier = { |
1738 | .notifier_call = bcm_notifier | |
1739 | }; | |
1740 | ||
ffd980f9 OH |
1741 | static int __init bcm_module_init(void) |
1742 | { | |
1743 | int err; | |
1744 | ||
f726f3d3 | 1745 | pr_info("can: broadcast manager protocol\n"); |
ffd980f9 OH |
1746 | |
1747 | err = can_proto_register(&bcm_can_proto); | |
1748 | if (err < 0) { | |
1749 | printk(KERN_ERR "can: registration of bcm protocol failed\n"); | |
1750 | return err; | |
1751 | } | |
1752 | ||
384317ef | 1753 | register_pernet_subsys(&canbcm_pernet_ops); |
8d0caedb | 1754 | register_netdevice_notifier(&canbcm_notifier); |
ffd980f9 OH |
1755 | return 0; |
1756 | } | |
1757 | ||
1758 | static void __exit bcm_module_exit(void) | |
1759 | { | |
1760 | can_proto_unregister(&bcm_can_proto); | |
8d0caedb | 1761 | unregister_netdevice_notifier(&canbcm_notifier); |
384317ef | 1762 | unregister_pernet_subsys(&canbcm_pernet_ops); |
ffd980f9 OH |
1763 | } |
1764 | ||
1765 | module_init(bcm_module_init); | |
1766 | module_exit(bcm_module_exit); |