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e057dd3f OH |
1 | // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
2 | /* isotp.c - ISO 15765-2 CAN transport protocol for protocol family CAN | |
3 | * | |
4 | * This implementation does not provide ISO-TP specific return values to the | |
5 | * userspace. | |
6 | * | |
7 | * - RX path timeout of data reception leads to -ETIMEDOUT | |
8 | * - RX path SN mismatch leads to -EILSEQ | |
9 | * - RX path data reception with wrong padding leads to -EBADMSG | |
10 | * - TX path flowcontrol reception timeout leads to -ECOMM | |
11 | * - TX path flowcontrol reception overflow leads to -EMSGSIZE | |
12 | * - TX path flowcontrol reception with wrong layout/padding leads to -EBADMSG | |
13 | * - when a transfer (tx) is on the run the next write() blocks until it's done | |
14 | * - use CAN_ISOTP_WAIT_TX_DONE flag to block the caller until the PDU is sent | |
15 | * - as we have static buffers the check whether the PDU fits into the buffer | |
16 | * is done at FF reception time (no support for sending 'wait frames') | |
17 | * - take care of the tx-queue-len as traffic shaping is still on the TODO list | |
18 | * | |
19 | * Copyright (c) 2020 Volkswagen Group Electronic Research | |
20 | * All rights reserved. | |
21 | * | |
22 | * Redistribution and use in source and binary forms, with or without | |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the above copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. Neither the name of Volkswagen nor the names of its contributors | |
31 | * may be used to endorse or promote products derived from this software | |
32 | * without specific prior written permission. | |
33 | * | |
34 | * Alternatively, provided that this notice is retained in full, this | |
35 | * software may be distributed under the terms of the GNU General | |
36 | * Public License ("GPL") version 2, in which case the provisions of the | |
37 | * GPL apply INSTEAD OF those given above. | |
38 | * | |
39 | * The provided data structures and external interfaces from this code | |
40 | * are not restricted to be used by modules with a GPL compatible license. | |
41 | * | |
42 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
43 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
44 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
45 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
46 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
47 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
48 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
49 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
50 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
51 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
52 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
53 | * DAMAGE. | |
54 | */ | |
55 | ||
56 | #include <linux/module.h> | |
57 | #include <linux/init.h> | |
58 | #include <linux/interrupt.h> | |
59 | #include <linux/hrtimer.h> | |
60 | #include <linux/wait.h> | |
61 | #include <linux/uio.h> | |
62 | #include <linux/net.h> | |
63 | #include <linux/netdevice.h> | |
64 | #include <linux/socket.h> | |
65 | #include <linux/if_arp.h> | |
66 | #include <linux/skbuff.h> | |
67 | #include <linux/can.h> | |
68 | #include <linux/can/core.h> | |
69 | #include <linux/can/skb.h> | |
70 | #include <linux/can/isotp.h> | |
71 | #include <linux/slab.h> | |
72 | #include <net/sock.h> | |
73 | #include <net/net_namespace.h> | |
74 | ||
e057dd3f OH |
75 | MODULE_DESCRIPTION("PF_CAN isotp 15765-2:2016 protocol"); |
76 | MODULE_LICENSE("Dual BSD/GPL"); | |
77 | MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>"); | |
78 | MODULE_ALIAS("can-proto-6"); | |
79 | ||
f522d955 OH |
80 | #define ISOTP_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp) |
81 | ||
e057dd3f OH |
82 | #define SINGLE_MASK(id) (((id) & CAN_EFF_FLAG) ? \ |
83 | (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \ | |
84 | (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG)) | |
85 | ||
86 | /* ISO 15765-2:2016 supports more than 4095 byte per ISO PDU as the FF_DL can | |
87 | * take full 32 bit values (4 Gbyte). We would need some good concept to handle | |
88 | * this between user space and kernel space. For now increase the static buffer | |
89 | * to something about 8 kbyte to be able to test this new functionality. | |
90 | */ | |
91 | #define MAX_MSG_LENGTH 8200 | |
92 | ||
93 | /* N_PCI type values in bits 7-4 of N_PCI bytes */ | |
94 | #define N_PCI_SF 0x00 /* single frame */ | |
95 | #define N_PCI_FF 0x10 /* first frame */ | |
96 | #define N_PCI_CF 0x20 /* consecutive frame */ | |
97 | #define N_PCI_FC 0x30 /* flow control */ | |
98 | ||
99 | #define N_PCI_SZ 1 /* size of the PCI byte #1 */ | |
100 | #define SF_PCI_SZ4 1 /* size of SingleFrame PCI including 4 bit SF_DL */ | |
101 | #define SF_PCI_SZ8 2 /* size of SingleFrame PCI including 8 bit SF_DL */ | |
102 | #define FF_PCI_SZ12 2 /* size of FirstFrame PCI including 12 bit FF_DL */ | |
103 | #define FF_PCI_SZ32 6 /* size of FirstFrame PCI including 32 bit FF_DL */ | |
104 | #define FC_CONTENT_SZ 3 /* flow control content size in byte (FS/BS/STmin) */ | |
105 | ||
106 | #define ISOTP_CHECK_PADDING (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA) | |
107 | ||
108 | /* Flow Status given in FC frame */ | |
109 | #define ISOTP_FC_CTS 0 /* clear to send */ | |
110 | #define ISOTP_FC_WT 1 /* wait */ | |
111 | #define ISOTP_FC_OVFLW 2 /* overflow */ | |
112 | ||
113 | enum { | |
114 | ISOTP_IDLE = 0, | |
115 | ISOTP_WAIT_FIRST_FC, | |
116 | ISOTP_WAIT_FC, | |
117 | ISOTP_WAIT_DATA, | |
118 | ISOTP_SENDING | |
119 | }; | |
120 | ||
121 | struct tpcon { | |
122 | int idx; | |
123 | int len; | |
124 | u8 state; | |
125 | u8 bs; | |
126 | u8 sn; | |
127 | u8 ll_dl; | |
128 | u8 buf[MAX_MSG_LENGTH + 1]; | |
129 | }; | |
130 | ||
131 | struct isotp_sock { | |
132 | struct sock sk; | |
133 | int bound; | |
134 | int ifindex; | |
135 | canid_t txid; | |
136 | canid_t rxid; | |
137 | ktime_t tx_gap; | |
138 | ktime_t lastrxcf_tstamp; | |
139 | struct hrtimer rxtimer, txtimer; | |
140 | struct can_isotp_options opt; | |
141 | struct can_isotp_fc_options rxfc, txfc; | |
142 | struct can_isotp_ll_options ll; | |
143 | u32 force_tx_stmin; | |
144 | u32 force_rx_stmin; | |
145 | struct tpcon rx, tx; | |
8d0caedb | 146 | struct list_head notifier; |
e057dd3f OH |
147 | wait_queue_head_t wait; |
148 | }; | |
149 | ||
8d0caedb TH |
150 | static LIST_HEAD(isotp_notifier_list); |
151 | static DEFINE_SPINLOCK(isotp_notifier_lock); | |
152 | static struct isotp_sock *isotp_busy_notifier; | |
153 | ||
e057dd3f OH |
154 | static inline struct isotp_sock *isotp_sk(const struct sock *sk) |
155 | { | |
156 | return (struct isotp_sock *)sk; | |
157 | } | |
158 | ||
159 | static enum hrtimer_restart isotp_rx_timer_handler(struct hrtimer *hrtimer) | |
160 | { | |
161 | struct isotp_sock *so = container_of(hrtimer, struct isotp_sock, | |
162 | rxtimer); | |
163 | struct sock *sk = &so->sk; | |
164 | ||
165 | if (so->rx.state == ISOTP_WAIT_DATA) { | |
166 | /* we did not get new data frames in time */ | |
167 | ||
168 | /* report 'connection timed out' */ | |
169 | sk->sk_err = ETIMEDOUT; | |
170 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 171 | sk_error_report(sk); |
e057dd3f OH |
172 | |
173 | /* reset rx state */ | |
174 | so->rx.state = ISOTP_IDLE; | |
175 | } | |
176 | ||
177 | return HRTIMER_NORESTART; | |
178 | } | |
179 | ||
180 | static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus) | |
181 | { | |
182 | struct net_device *dev; | |
183 | struct sk_buff *nskb; | |
184 | struct canfd_frame *ncf; | |
185 | struct isotp_sock *so = isotp_sk(sk); | |
186 | int can_send_ret; | |
187 | ||
188 | nskb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), gfp_any()); | |
189 | if (!nskb) | |
190 | return 1; | |
191 | ||
192 | dev = dev_get_by_index(sock_net(sk), so->ifindex); | |
193 | if (!dev) { | |
194 | kfree_skb(nskb); | |
195 | return 1; | |
196 | } | |
197 | ||
198 | can_skb_reserve(nskb); | |
199 | can_skb_prv(nskb)->ifindex = dev->ifindex; | |
200 | can_skb_prv(nskb)->skbcnt = 0; | |
201 | ||
202 | nskb->dev = dev; | |
203 | can_skb_set_owner(nskb, sk); | |
204 | ncf = (struct canfd_frame *)nskb->data; | |
b5f020f8 | 205 | skb_put_zero(nskb, so->ll.mtu); |
e057dd3f OH |
206 | |
207 | /* create & send flow control reply */ | |
208 | ncf->can_id = so->txid; | |
209 | ||
210 | if (so->opt.flags & CAN_ISOTP_TX_PADDING) { | |
211 | memset(ncf->data, so->opt.txpad_content, CAN_MAX_DLEN); | |
212 | ncf->len = CAN_MAX_DLEN; | |
213 | } else { | |
214 | ncf->len = ae + FC_CONTENT_SZ; | |
215 | } | |
216 | ||
217 | ncf->data[ae] = N_PCI_FC | flowstatus; | |
218 | ncf->data[ae + 1] = so->rxfc.bs; | |
219 | ncf->data[ae + 2] = so->rxfc.stmin; | |
220 | ||
221 | if (ae) | |
222 | ncf->data[0] = so->opt.ext_address; | |
223 | ||
d4eb538e | 224 | ncf->flags = so->ll.tx_flags; |
e057dd3f OH |
225 | |
226 | can_send_ret = can_send(nskb, 1); | |
227 | if (can_send_ret) | |
46d8657a PM |
228 | pr_notice_once("can-isotp: %s: can_send_ret %pe\n", |
229 | __func__, ERR_PTR(can_send_ret)); | |
e057dd3f OH |
230 | |
231 | dev_put(dev); | |
232 | ||
233 | /* reset blocksize counter */ | |
234 | so->rx.bs = 0; | |
235 | ||
236 | /* reset last CF frame rx timestamp for rx stmin enforcement */ | |
237 | so->lastrxcf_tstamp = ktime_set(0, 0); | |
238 | ||
239 | /* start rx timeout watchdog */ | |
240 | hrtimer_start(&so->rxtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static void isotp_rcv_skb(struct sk_buff *skb, struct sock *sk) | |
245 | { | |
246 | struct sockaddr_can *addr = (struct sockaddr_can *)skb->cb; | |
247 | ||
248 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can)); | |
249 | ||
250 | memset(addr, 0, sizeof(*addr)); | |
251 | addr->can_family = AF_CAN; | |
252 | addr->can_ifindex = skb->dev->ifindex; | |
253 | ||
254 | if (sock_queue_rcv_skb(sk, skb) < 0) | |
255 | kfree_skb(skb); | |
256 | } | |
257 | ||
258 | static u8 padlen(u8 datalen) | |
259 | { | |
c3ddac4b CIK |
260 | static const u8 plen[] = { |
261 | 8, 8, 8, 8, 8, 8, 8, 8, 8, /* 0 - 8 */ | |
262 | 12, 12, 12, 12, /* 9 - 12 */ | |
263 | 16, 16, 16, 16, /* 13 - 16 */ | |
264 | 20, 20, 20, 20, /* 17 - 20 */ | |
265 | 24, 24, 24, 24, /* 21 - 24 */ | |
266 | 32, 32, 32, 32, 32, 32, 32, 32, /* 25 - 32 */ | |
267 | 48, 48, 48, 48, 48, 48, 48, 48, /* 33 - 40 */ | |
268 | 48, 48, 48, 48, 48, 48, 48, 48 /* 41 - 48 */ | |
269 | }; | |
e057dd3f OH |
270 | |
271 | if (datalen > 48) | |
272 | return 64; | |
273 | ||
274 | return plen[datalen]; | |
275 | } | |
276 | ||
277 | /* check for length optimization and return 1/true when the check fails */ | |
278 | static int check_optimized(struct canfd_frame *cf, int start_index) | |
279 | { | |
280 | /* for CAN_DL <= 8 the start_index is equal to the CAN_DL as the | |
281 | * padding would start at this point. E.g. if the padding would | |
282 | * start at cf.data[7] cf->len has to be 7 to be optimal. | |
283 | * Note: The data[] index starts with zero. | |
284 | */ | |
285 | if (cf->len <= CAN_MAX_DLEN) | |
286 | return (cf->len != start_index); | |
287 | ||
288 | /* This relation is also valid in the non-linear DLC range, where | |
289 | * we need to take care of the minimal next possible CAN_DL. | |
290 | * The correct check would be (padlen(cf->len) != padlen(start_index)). | |
291 | * But as cf->len can only take discrete values from 12, .., 64 at this | |
292 | * point the padlen(cf->len) is always equal to cf->len. | |
293 | */ | |
294 | return (cf->len != padlen(start_index)); | |
295 | } | |
296 | ||
297 | /* check padding and return 1/true when the check fails */ | |
298 | static int check_pad(struct isotp_sock *so, struct canfd_frame *cf, | |
299 | int start_index, u8 content) | |
300 | { | |
301 | int i; | |
302 | ||
303 | /* no RX_PADDING value => check length of optimized frame length */ | |
304 | if (!(so->opt.flags & CAN_ISOTP_RX_PADDING)) { | |
305 | if (so->opt.flags & CAN_ISOTP_CHK_PAD_LEN) | |
306 | return check_optimized(cf, start_index); | |
307 | ||
308 | /* no valid test against empty value => ignore frame */ | |
309 | return 1; | |
310 | } | |
311 | ||
312 | /* check datalength of correctly padded CAN frame */ | |
313 | if ((so->opt.flags & CAN_ISOTP_CHK_PAD_LEN) && | |
314 | cf->len != padlen(cf->len)) | |
315 | return 1; | |
316 | ||
317 | /* check padding content */ | |
318 | if (so->opt.flags & CAN_ISOTP_CHK_PAD_DATA) { | |
319 | for (i = start_index; i < cf->len; i++) | |
320 | if (cf->data[i] != content) | |
321 | return 1; | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae) | |
327 | { | |
328 | struct sock *sk = &so->sk; | |
329 | ||
330 | if (so->tx.state != ISOTP_WAIT_FC && | |
331 | so->tx.state != ISOTP_WAIT_FIRST_FC) | |
332 | return 0; | |
333 | ||
334 | hrtimer_cancel(&so->txtimer); | |
335 | ||
336 | if ((cf->len < ae + FC_CONTENT_SZ) || | |
337 | ((so->opt.flags & ISOTP_CHECK_PADDING) && | |
338 | check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) { | |
339 | /* malformed PDU - report 'not a data message' */ | |
340 | sk->sk_err = EBADMSG; | |
341 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 342 | sk_error_report(sk); |
e057dd3f OH |
343 | |
344 | so->tx.state = ISOTP_IDLE; | |
345 | wake_up_interruptible(&so->wait); | |
346 | return 1; | |
347 | } | |
348 | ||
349 | /* get communication parameters only from the first FC frame */ | |
350 | if (so->tx.state == ISOTP_WAIT_FIRST_FC) { | |
351 | so->txfc.bs = cf->data[ae + 1]; | |
352 | so->txfc.stmin = cf->data[ae + 2]; | |
353 | ||
354 | /* fix wrong STmin values according spec */ | |
355 | if (so->txfc.stmin > 0x7F && | |
356 | (so->txfc.stmin < 0xF1 || so->txfc.stmin > 0xF9)) | |
357 | so->txfc.stmin = 0x7F; | |
358 | ||
359 | so->tx_gap = ktime_set(0, 0); | |
360 | /* add transmission time for CAN frame N_As */ | |
361 | so->tx_gap = ktime_add_ns(so->tx_gap, so->opt.frame_txtime); | |
362 | /* add waiting time for consecutive frames N_Cs */ | |
363 | if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN) | |
364 | so->tx_gap = ktime_add_ns(so->tx_gap, | |
365 | so->force_tx_stmin); | |
366 | else if (so->txfc.stmin < 0x80) | |
367 | so->tx_gap = ktime_add_ns(so->tx_gap, | |
368 | so->txfc.stmin * 1000000); | |
369 | else | |
370 | so->tx_gap = ktime_add_ns(so->tx_gap, | |
371 | (so->txfc.stmin - 0xF0) | |
372 | * 100000); | |
373 | so->tx.state = ISOTP_WAIT_FC; | |
374 | } | |
375 | ||
376 | switch (cf->data[ae] & 0x0F) { | |
377 | case ISOTP_FC_CTS: | |
378 | so->tx.bs = 0; | |
379 | so->tx.state = ISOTP_SENDING; | |
380 | /* start cyclic timer for sending CF frame */ | |
381 | hrtimer_start(&so->txtimer, so->tx_gap, | |
382 | HRTIMER_MODE_REL_SOFT); | |
383 | break; | |
384 | ||
385 | case ISOTP_FC_WT: | |
386 | /* start timer to wait for next FC frame */ | |
387 | hrtimer_start(&so->txtimer, ktime_set(1, 0), | |
388 | HRTIMER_MODE_REL_SOFT); | |
389 | break; | |
390 | ||
391 | case ISOTP_FC_OVFLW: | |
392 | /* overflow on receiver side - report 'message too long' */ | |
393 | sk->sk_err = EMSGSIZE; | |
394 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 395 | sk_error_report(sk); |
e057dd3f OH |
396 | fallthrough; |
397 | ||
398 | default: | |
399 | /* stop this tx job */ | |
400 | so->tx.state = ISOTP_IDLE; | |
401 | wake_up_interruptible(&so->wait); | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen, | |
407 | struct sk_buff *skb, int len) | |
408 | { | |
409 | struct isotp_sock *so = isotp_sk(sk); | |
410 | struct sk_buff *nskb; | |
411 | ||
412 | hrtimer_cancel(&so->rxtimer); | |
413 | so->rx.state = ISOTP_IDLE; | |
414 | ||
415 | if (!len || len > cf->len - pcilen) | |
416 | return 1; | |
417 | ||
418 | if ((so->opt.flags & ISOTP_CHECK_PADDING) && | |
419 | check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) { | |
420 | /* malformed PDU - report 'not a data message' */ | |
421 | sk->sk_err = EBADMSG; | |
422 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 423 | sk_error_report(sk); |
e057dd3f OH |
424 | return 1; |
425 | } | |
426 | ||
427 | nskb = alloc_skb(len, gfp_any()); | |
428 | if (!nskb) | |
429 | return 1; | |
430 | ||
431 | memcpy(skb_put(nskb, len), &cf->data[pcilen], len); | |
432 | ||
433 | nskb->tstamp = skb->tstamp; | |
434 | nskb->dev = skb->dev; | |
435 | isotp_rcv_skb(nskb, sk); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae) | |
440 | { | |
441 | struct isotp_sock *so = isotp_sk(sk); | |
442 | int i; | |
443 | int off; | |
444 | int ff_pci_sz; | |
445 | ||
446 | hrtimer_cancel(&so->rxtimer); | |
447 | so->rx.state = ISOTP_IDLE; | |
448 | ||
449 | /* get the used sender LL_DL from the (first) CAN frame data length */ | |
450 | so->rx.ll_dl = padlen(cf->len); | |
451 | ||
452 | /* the first frame has to use the entire frame up to LL_DL length */ | |
453 | if (cf->len != so->rx.ll_dl) | |
454 | return 1; | |
455 | ||
456 | /* get the FF_DL */ | |
457 | so->rx.len = (cf->data[ae] & 0x0F) << 8; | |
458 | so->rx.len += cf->data[ae + 1]; | |
459 | ||
460 | /* Check for FF_DL escape sequence supporting 32 bit PDU length */ | |
461 | if (so->rx.len) { | |
462 | ff_pci_sz = FF_PCI_SZ12; | |
463 | } else { | |
464 | /* FF_DL = 0 => get real length from next 4 bytes */ | |
465 | so->rx.len = cf->data[ae + 2] << 24; | |
466 | so->rx.len += cf->data[ae + 3] << 16; | |
467 | so->rx.len += cf->data[ae + 4] << 8; | |
468 | so->rx.len += cf->data[ae + 5]; | |
469 | ff_pci_sz = FF_PCI_SZ32; | |
470 | } | |
471 | ||
472 | /* take care of a potential SF_DL ESC offset for TX_DL > 8 */ | |
473 | off = (so->rx.ll_dl > CAN_MAX_DLEN) ? 1 : 0; | |
474 | ||
475 | if (so->rx.len + ae + off + ff_pci_sz < so->rx.ll_dl) | |
476 | return 1; | |
477 | ||
478 | if (so->rx.len > MAX_MSG_LENGTH) { | |
479 | /* send FC frame with overflow status */ | |
480 | isotp_send_fc(sk, ae, ISOTP_FC_OVFLW); | |
481 | return 1; | |
482 | } | |
483 | ||
484 | /* copy the first received data bytes */ | |
485 | so->rx.idx = 0; | |
486 | for (i = ae + ff_pci_sz; i < so->rx.ll_dl; i++) | |
487 | so->rx.buf[so->rx.idx++] = cf->data[i]; | |
488 | ||
489 | /* initial setup for this pdu reception */ | |
490 | so->rx.sn = 1; | |
491 | so->rx.state = ISOTP_WAIT_DATA; | |
492 | ||
493 | /* no creation of flow control frames */ | |
494 | if (so->opt.flags & CAN_ISOTP_LISTEN_MODE) | |
495 | return 0; | |
496 | ||
497 | /* send our first FC frame */ | |
498 | isotp_send_fc(sk, ae, ISOTP_FC_CTS); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae, | |
503 | struct sk_buff *skb) | |
504 | { | |
505 | struct isotp_sock *so = isotp_sk(sk); | |
506 | struct sk_buff *nskb; | |
507 | int i; | |
508 | ||
509 | if (so->rx.state != ISOTP_WAIT_DATA) | |
510 | return 0; | |
511 | ||
512 | /* drop if timestamp gap is less than force_rx_stmin nano secs */ | |
513 | if (so->opt.flags & CAN_ISOTP_FORCE_RXSTMIN) { | |
514 | if (ktime_to_ns(ktime_sub(skb->tstamp, so->lastrxcf_tstamp)) < | |
515 | so->force_rx_stmin) | |
516 | return 0; | |
517 | ||
518 | so->lastrxcf_tstamp = skb->tstamp; | |
519 | } | |
520 | ||
521 | hrtimer_cancel(&so->rxtimer); | |
522 | ||
523 | /* CFs are never longer than the FF */ | |
524 | if (cf->len > so->rx.ll_dl) | |
525 | return 1; | |
526 | ||
527 | /* CFs have usually the LL_DL length */ | |
528 | if (cf->len < so->rx.ll_dl) { | |
529 | /* this is only allowed for the last CF */ | |
530 | if (so->rx.len - so->rx.idx > so->rx.ll_dl - ae - N_PCI_SZ) | |
531 | return 1; | |
532 | } | |
533 | ||
534 | if ((cf->data[ae] & 0x0F) != so->rx.sn) { | |
535 | /* wrong sn detected - report 'illegal byte sequence' */ | |
536 | sk->sk_err = EILSEQ; | |
537 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 538 | sk_error_report(sk); |
e057dd3f OH |
539 | |
540 | /* reset rx state */ | |
541 | so->rx.state = ISOTP_IDLE; | |
542 | return 1; | |
543 | } | |
544 | so->rx.sn++; | |
545 | so->rx.sn %= 16; | |
546 | ||
547 | for (i = ae + N_PCI_SZ; i < cf->len; i++) { | |
548 | so->rx.buf[so->rx.idx++] = cf->data[i]; | |
549 | if (so->rx.idx >= so->rx.len) | |
550 | break; | |
551 | } | |
552 | ||
553 | if (so->rx.idx >= so->rx.len) { | |
554 | /* we are done */ | |
555 | so->rx.state = ISOTP_IDLE; | |
556 | ||
557 | if ((so->opt.flags & ISOTP_CHECK_PADDING) && | |
558 | check_pad(so, cf, i + 1, so->opt.rxpad_content)) { | |
559 | /* malformed PDU - report 'not a data message' */ | |
560 | sk->sk_err = EBADMSG; | |
561 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 562 | sk_error_report(sk); |
e057dd3f OH |
563 | return 1; |
564 | } | |
565 | ||
566 | nskb = alloc_skb(so->rx.len, gfp_any()); | |
567 | if (!nskb) | |
568 | return 1; | |
569 | ||
570 | memcpy(skb_put(nskb, so->rx.len), so->rx.buf, | |
571 | so->rx.len); | |
572 | ||
573 | nskb->tstamp = skb->tstamp; | |
574 | nskb->dev = skb->dev; | |
575 | isotp_rcv_skb(nskb, sk); | |
576 | return 0; | |
577 | } | |
578 | ||
e057dd3f OH |
579 | /* perform blocksize handling, if enabled */ |
580 | if (!so->rxfc.bs || ++so->rx.bs < so->rxfc.bs) { | |
581 | /* start rx timeout watchdog */ | |
582 | hrtimer_start(&so->rxtimer, ktime_set(1, 0), | |
583 | HRTIMER_MODE_REL_SOFT); | |
584 | return 0; | |
585 | } | |
586 | ||
78656ea2 OH |
587 | /* no creation of flow control frames */ |
588 | if (so->opt.flags & CAN_ISOTP_LISTEN_MODE) | |
589 | return 0; | |
590 | ||
e057dd3f OH |
591 | /* we reached the specified blocksize so->rxfc.bs */ |
592 | isotp_send_fc(sk, ae, ISOTP_FC_CTS); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static void isotp_rcv(struct sk_buff *skb, void *data) | |
597 | { | |
598 | struct sock *sk = (struct sock *)data; | |
599 | struct isotp_sock *so = isotp_sk(sk); | |
600 | struct canfd_frame *cf; | |
601 | int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0; | |
602 | u8 n_pci_type, sf_dl; | |
603 | ||
604 | /* Strictly receive only frames with the configured MTU size | |
605 | * => clear separation of CAN2.0 / CAN FD transport channels | |
606 | */ | |
607 | if (skb->len != so->ll.mtu) | |
608 | return; | |
609 | ||
610 | cf = (struct canfd_frame *)skb->data; | |
611 | ||
612 | /* if enabled: check reception of my configured extended address */ | |
613 | if (ae && cf->data[0] != so->opt.rx_ext_address) | |
614 | return; | |
615 | ||
616 | n_pci_type = cf->data[ae] & 0xF0; | |
617 | ||
618 | if (so->opt.flags & CAN_ISOTP_HALF_DUPLEX) { | |
619 | /* check rx/tx path half duplex expectations */ | |
620 | if ((so->tx.state != ISOTP_IDLE && n_pci_type != N_PCI_FC) || | |
621 | (so->rx.state != ISOTP_IDLE && n_pci_type == N_PCI_FC)) | |
622 | return; | |
623 | } | |
624 | ||
625 | switch (n_pci_type) { | |
626 | case N_PCI_FC: | |
627 | /* tx path: flow control frame containing the FC parameters */ | |
628 | isotp_rcv_fc(so, cf, ae); | |
629 | break; | |
630 | ||
631 | case N_PCI_SF: | |
632 | /* rx path: single frame | |
633 | * | |
634 | * As we do not have a rx.ll_dl configuration, we can only test | |
635 | * if the CAN frames payload length matches the LL_DL == 8 | |
636 | * requirements - no matter if it's CAN 2.0 or CAN FD | |
637 | */ | |
638 | ||
639 | /* get the SF_DL from the N_PCI byte */ | |
640 | sf_dl = cf->data[ae] & 0x0F; | |
641 | ||
642 | if (cf->len <= CAN_MAX_DLEN) { | |
643 | isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl); | |
644 | } else { | |
645 | if (skb->len == CANFD_MTU) { | |
646 | /* We have a CAN FD frame and CAN_DL is greater than 8: | |
647 | * Only frames with the SF_DL == 0 ESC value are valid. | |
648 | * | |
649 | * If so take care of the increased SF PCI size | |
650 | * (SF_PCI_SZ8) to point to the message content behind | |
651 | * the extended SF PCI info and get the real SF_DL | |
652 | * length value from the formerly first data byte. | |
653 | */ | |
654 | if (sf_dl == 0) | |
655 | isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb, | |
656 | cf->data[SF_PCI_SZ4 + ae]); | |
657 | } | |
658 | } | |
659 | break; | |
660 | ||
661 | case N_PCI_FF: | |
662 | /* rx path: first frame */ | |
663 | isotp_rcv_ff(sk, cf, ae); | |
664 | break; | |
665 | ||
666 | case N_PCI_CF: | |
667 | /* rx path: consecutive frame */ | |
668 | isotp_rcv_cf(sk, cf, ae, skb); | |
669 | break; | |
670 | } | |
671 | } | |
672 | ||
673 | static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so, | |
674 | int ae, int off) | |
675 | { | |
676 | int pcilen = N_PCI_SZ + ae + off; | |
677 | int space = so->tx.ll_dl - pcilen; | |
678 | int num = min_t(int, so->tx.len - so->tx.idx, space); | |
679 | int i; | |
680 | ||
681 | cf->can_id = so->txid; | |
682 | cf->len = num + pcilen; | |
683 | ||
684 | if (num < space) { | |
685 | if (so->opt.flags & CAN_ISOTP_TX_PADDING) { | |
686 | /* user requested padding */ | |
687 | cf->len = padlen(cf->len); | |
688 | memset(cf->data, so->opt.txpad_content, cf->len); | |
689 | } else if (cf->len > CAN_MAX_DLEN) { | |
690 | /* mandatory padding for CAN FD frames */ | |
691 | cf->len = padlen(cf->len); | |
692 | memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT, | |
693 | cf->len); | |
694 | } | |
695 | } | |
696 | ||
697 | for (i = 0; i < num; i++) | |
698 | cf->data[pcilen + i] = so->tx.buf[so->tx.idx++]; | |
699 | ||
700 | if (ae) | |
701 | cf->data[0] = so->opt.ext_address; | |
702 | } | |
703 | ||
704 | static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so, | |
705 | int ae) | |
706 | { | |
707 | int i; | |
708 | int ff_pci_sz; | |
709 | ||
710 | cf->can_id = so->txid; | |
711 | cf->len = so->tx.ll_dl; | |
712 | if (ae) | |
713 | cf->data[0] = so->opt.ext_address; | |
714 | ||
715 | /* create N_PCI bytes with 12/32 bit FF_DL data length */ | |
716 | if (so->tx.len > 4095) { | |
717 | /* use 32 bit FF_DL notation */ | |
718 | cf->data[ae] = N_PCI_FF; | |
719 | cf->data[ae + 1] = 0; | |
720 | cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU; | |
721 | cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU; | |
722 | cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU; | |
723 | cf->data[ae + 5] = (u8)so->tx.len & 0xFFU; | |
724 | ff_pci_sz = FF_PCI_SZ32; | |
725 | } else { | |
726 | /* use 12 bit FF_DL notation */ | |
727 | cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF; | |
728 | cf->data[ae + 1] = (u8)so->tx.len & 0xFFU; | |
729 | ff_pci_sz = FF_PCI_SZ12; | |
730 | } | |
731 | ||
732 | /* add first data bytes depending on ae */ | |
733 | for (i = ae + ff_pci_sz; i < so->tx.ll_dl; i++) | |
734 | cf->data[i] = so->tx.buf[so->tx.idx++]; | |
735 | ||
736 | so->tx.sn = 1; | |
737 | so->tx.state = ISOTP_WAIT_FIRST_FC; | |
738 | } | |
739 | ||
740 | static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer) | |
741 | { | |
742 | struct isotp_sock *so = container_of(hrtimer, struct isotp_sock, | |
743 | txtimer); | |
744 | struct sock *sk = &so->sk; | |
745 | struct sk_buff *skb; | |
746 | struct net_device *dev; | |
747 | struct canfd_frame *cf; | |
748 | enum hrtimer_restart restart = HRTIMER_NORESTART; | |
749 | int can_send_ret; | |
750 | int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0; | |
751 | ||
752 | switch (so->tx.state) { | |
753 | case ISOTP_WAIT_FC: | |
754 | case ISOTP_WAIT_FIRST_FC: | |
755 | ||
756 | /* we did not get any flow control frame in time */ | |
757 | ||
758 | /* report 'communication error on send' */ | |
759 | sk->sk_err = ECOMM; | |
760 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 761 | sk_error_report(sk); |
e057dd3f OH |
762 | |
763 | /* reset tx state */ | |
764 | so->tx.state = ISOTP_IDLE; | |
765 | wake_up_interruptible(&so->wait); | |
766 | break; | |
767 | ||
768 | case ISOTP_SENDING: | |
769 | ||
770 | /* push out the next segmented pdu */ | |
771 | dev = dev_get_by_index(sock_net(sk), so->ifindex); | |
772 | if (!dev) | |
773 | break; | |
774 | ||
775 | isotp_tx_burst: | |
776 | skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), | |
ac911bfe | 777 | GFP_ATOMIC); |
e057dd3f OH |
778 | if (!skb) { |
779 | dev_put(dev); | |
780 | break; | |
781 | } | |
782 | ||
783 | can_skb_reserve(skb); | |
784 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
785 | can_skb_prv(skb)->skbcnt = 0; | |
786 | ||
787 | cf = (struct canfd_frame *)skb->data; | |
b5f020f8 | 788 | skb_put_zero(skb, so->ll.mtu); |
e057dd3f OH |
789 | |
790 | /* create consecutive frame */ | |
791 | isotp_fill_dataframe(cf, so, ae, 0); | |
792 | ||
793 | /* place consecutive frame N_PCI in appropriate index */ | |
794 | cf->data[ae] = N_PCI_CF | so->tx.sn++; | |
795 | so->tx.sn %= 16; | |
796 | so->tx.bs++; | |
797 | ||
d4eb538e | 798 | cf->flags = so->ll.tx_flags; |
e057dd3f OH |
799 | |
800 | skb->dev = dev; | |
801 | can_skb_set_owner(skb, sk); | |
802 | ||
803 | can_send_ret = can_send(skb, 1); | |
c69d190f | 804 | if (can_send_ret) { |
46d8657a PM |
805 | pr_notice_once("can-isotp: %s: can_send_ret %pe\n", |
806 | __func__, ERR_PTR(can_send_ret)); | |
c69d190f PM |
807 | if (can_send_ret == -ENOBUFS) |
808 | pr_notice_once("can-isotp: tx queue is full, increasing txqueuelen may prevent this error\n"); | |
809 | } | |
e057dd3f OH |
810 | if (so->tx.idx >= so->tx.len) { |
811 | /* we are done */ | |
812 | so->tx.state = ISOTP_IDLE; | |
813 | dev_put(dev); | |
814 | wake_up_interruptible(&so->wait); | |
815 | break; | |
816 | } | |
817 | ||
818 | if (so->txfc.bs && so->tx.bs >= so->txfc.bs) { | |
819 | /* stop and wait for FC */ | |
820 | so->tx.state = ISOTP_WAIT_FC; | |
821 | dev_put(dev); | |
822 | hrtimer_set_expires(&so->txtimer, | |
823 | ktime_add(ktime_get(), | |
824 | ktime_set(1, 0))); | |
825 | restart = HRTIMER_RESTART; | |
826 | break; | |
827 | } | |
828 | ||
829 | /* no gap between data frames needed => use burst mode */ | |
830 | if (!so->tx_gap) | |
831 | goto isotp_tx_burst; | |
832 | ||
833 | /* start timer to send next data frame with correct delay */ | |
834 | dev_put(dev); | |
835 | hrtimer_set_expires(&so->txtimer, | |
836 | ktime_add(ktime_get(), so->tx_gap)); | |
837 | restart = HRTIMER_RESTART; | |
838 | break; | |
839 | ||
840 | default: | |
841 | WARN_ON_ONCE(1); | |
842 | } | |
843 | ||
844 | return restart; | |
845 | } | |
846 | ||
847 | static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) | |
848 | { | |
849 | struct sock *sk = sock->sk; | |
850 | struct isotp_sock *so = isotp_sk(sk); | |
851 | struct sk_buff *skb; | |
852 | struct net_device *dev; | |
853 | struct canfd_frame *cf; | |
854 | int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0; | |
855 | int wait_tx_done = (so->opt.flags & CAN_ISOTP_WAIT_TX_DONE) ? 1 : 0; | |
856 | int off; | |
857 | int err; | |
858 | ||
859 | if (!so->bound) | |
860 | return -EADDRNOTAVAIL; | |
861 | ||
862 | /* we do not support multiple buffers - for now */ | |
863 | if (so->tx.state != ISOTP_IDLE || wq_has_sleeper(&so->wait)) { | |
864 | if (msg->msg_flags & MSG_DONTWAIT) | |
865 | return -EAGAIN; | |
866 | ||
867 | /* wait for complete transmission of current pdu */ | |
868 | wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); | |
869 | } | |
870 | ||
871 | if (!size || size > MAX_MSG_LENGTH) | |
872 | return -EINVAL; | |
873 | ||
921ca574 OH |
874 | /* take care of a potential SF_DL ESC offset for TX_DL > 8 */ |
875 | off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0; | |
876 | ||
877 | /* does the given data fit into a single frame for SF_BROADCAST? */ | |
878 | if ((so->opt.flags & CAN_ISOTP_SF_BROADCAST) && | |
879 | (size > so->tx.ll_dl - SF_PCI_SZ4 - ae - off)) | |
880 | return -EINVAL; | |
881 | ||
e057dd3f OH |
882 | err = memcpy_from_msg(so->tx.buf, msg, size); |
883 | if (err < 0) | |
884 | return err; | |
885 | ||
886 | dev = dev_get_by_index(sock_net(sk), so->ifindex); | |
887 | if (!dev) | |
888 | return -ENXIO; | |
889 | ||
890 | skb = sock_alloc_send_skb(sk, so->ll.mtu + sizeof(struct can_skb_priv), | |
891 | msg->msg_flags & MSG_DONTWAIT, &err); | |
892 | if (!skb) { | |
893 | dev_put(dev); | |
894 | return err; | |
895 | } | |
896 | ||
897 | can_skb_reserve(skb); | |
898 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
899 | can_skb_prv(skb)->skbcnt = 0; | |
900 | ||
901 | so->tx.state = ISOTP_SENDING; | |
902 | so->tx.len = size; | |
903 | so->tx.idx = 0; | |
904 | ||
905 | cf = (struct canfd_frame *)skb->data; | |
b5f020f8 | 906 | skb_put_zero(skb, so->ll.mtu); |
e057dd3f | 907 | |
e057dd3f OH |
908 | /* check for single frame transmission depending on TX_DL */ |
909 | if (size <= so->tx.ll_dl - SF_PCI_SZ4 - ae - off) { | |
910 | /* The message size generally fits into a SingleFrame - good. | |
911 | * | |
912 | * SF_DL ESC offset optimization: | |
913 | * | |
914 | * When TX_DL is greater 8 but the message would still fit | |
915 | * into a 8 byte CAN frame, we can omit the offset. | |
916 | * This prevents a protocol caused length extension from | |
917 | * CAN_DL = 8 to CAN_DL = 12 due to the SF_SL ESC handling. | |
918 | */ | |
919 | if (size <= CAN_MAX_DLEN - SF_PCI_SZ4 - ae) | |
920 | off = 0; | |
921 | ||
922 | isotp_fill_dataframe(cf, so, ae, off); | |
923 | ||
924 | /* place single frame N_PCI w/o length in appropriate index */ | |
925 | cf->data[ae] = N_PCI_SF; | |
926 | ||
927 | /* place SF_DL size value depending on the SF_DL ESC offset */ | |
928 | if (off) | |
929 | cf->data[SF_PCI_SZ4 + ae] = size; | |
930 | else | |
931 | cf->data[ae] |= size; | |
932 | ||
933 | so->tx.state = ISOTP_IDLE; | |
934 | wake_up_interruptible(&so->wait); | |
935 | ||
936 | /* don't enable wait queue for a single frame transmission */ | |
937 | wait_tx_done = 0; | |
938 | } else { | |
939 | /* send first frame and wait for FC */ | |
940 | ||
941 | isotp_create_fframe(cf, so, ae); | |
942 | ||
943 | /* start timeout for FC */ | |
944 | hrtimer_start(&so->txtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); | |
945 | } | |
946 | ||
947 | /* send the first or only CAN frame */ | |
d4eb538e | 948 | cf->flags = so->ll.tx_flags; |
e057dd3f OH |
949 | |
950 | skb->dev = dev; | |
951 | skb->sk = sk; | |
952 | err = can_send(skb, 1); | |
953 | dev_put(dev); | |
954 | if (err) { | |
46d8657a PM |
955 | pr_notice_once("can-isotp: %s: can_send_ret %pe\n", |
956 | __func__, ERR_PTR(err)); | |
e057dd3f OH |
957 | return err; |
958 | } | |
959 | ||
960 | if (wait_tx_done) { | |
961 | /* wait for complete transmission of current pdu */ | |
962 | wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); | |
963 | } | |
964 | ||
965 | return size; | |
966 | } | |
967 | ||
968 | static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
969 | int flags) | |
970 | { | |
971 | struct sock *sk = sock->sk; | |
972 | struct sk_buff *skb; | |
973 | int err = 0; | |
974 | int noblock; | |
975 | ||
976 | noblock = flags & MSG_DONTWAIT; | |
977 | flags &= ~MSG_DONTWAIT; | |
978 | ||
979 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
980 | if (!skb) | |
981 | return err; | |
982 | ||
983 | if (size < skb->len) | |
984 | msg->msg_flags |= MSG_TRUNC; | |
985 | else | |
986 | size = skb->len; | |
987 | ||
988 | err = memcpy_to_msg(msg, skb->data, size); | |
989 | if (err < 0) { | |
990 | skb_free_datagram(sk, skb); | |
991 | return err; | |
992 | } | |
993 | ||
994 | sock_recv_timestamp(msg, sk, skb); | |
995 | ||
996 | if (msg->msg_name) { | |
f522d955 OH |
997 | __sockaddr_check_size(ISOTP_MIN_NAMELEN); |
998 | msg->msg_namelen = ISOTP_MIN_NAMELEN; | |
e057dd3f OH |
999 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
1000 | } | |
1001 | ||
1002 | skb_free_datagram(sk, skb); | |
1003 | ||
1004 | return size; | |
1005 | } | |
1006 | ||
1007 | static int isotp_release(struct socket *sock) | |
1008 | { | |
1009 | struct sock *sk = sock->sk; | |
1010 | struct isotp_sock *so; | |
1011 | struct net *net; | |
1012 | ||
1013 | if (!sk) | |
1014 | return 0; | |
1015 | ||
1016 | so = isotp_sk(sk); | |
1017 | net = sock_net(sk); | |
1018 | ||
1019 | /* wait for complete transmission of current pdu */ | |
1020 | wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE); | |
1021 | ||
8d0caedb TH |
1022 | spin_lock(&isotp_notifier_lock); |
1023 | while (isotp_busy_notifier == so) { | |
1024 | spin_unlock(&isotp_notifier_lock); | |
1025 | schedule_timeout_uninterruptible(1); | |
1026 | spin_lock(&isotp_notifier_lock); | |
1027 | } | |
1028 | list_del(&so->notifier); | |
1029 | spin_unlock(&isotp_notifier_lock); | |
e057dd3f OH |
1030 | |
1031 | lock_sock(sk); | |
1032 | ||
e057dd3f | 1033 | /* remove current filters & unregister */ |
921ca574 | 1034 | if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST))) { |
e057dd3f OH |
1035 | if (so->ifindex) { |
1036 | struct net_device *dev; | |
1037 | ||
1038 | dev = dev_get_by_index(net, so->ifindex); | |
1039 | if (dev) { | |
1040 | can_rx_unregister(net, dev, so->rxid, | |
1041 | SINGLE_MASK(so->rxid), | |
1042 | isotp_rcv, sk); | |
1043 | dev_put(dev); | |
14a4696b | 1044 | synchronize_rcu(); |
e057dd3f OH |
1045 | } |
1046 | } | |
1047 | } | |
1048 | ||
14a4696b OH |
1049 | hrtimer_cancel(&so->txtimer); |
1050 | hrtimer_cancel(&so->rxtimer); | |
1051 | ||
e057dd3f OH |
1052 | so->ifindex = 0; |
1053 | so->bound = 0; | |
1054 | ||
1055 | sock_orphan(sk); | |
1056 | sock->sk = NULL; | |
1057 | ||
1058 | release_sock(sk); | |
1059 | sock_put(sk); | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len) | |
1065 | { | |
1066 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1067 | struct sock *sk = sock->sk; | |
1068 | struct isotp_sock *so = isotp_sk(sk); | |
1069 | struct net *net = sock_net(sk); | |
1070 | int ifindex; | |
1071 | struct net_device *dev; | |
1072 | int err = 0; | |
1073 | int notify_enetdown = 0; | |
921ca574 | 1074 | int do_rx_reg = 1; |
e057dd3f | 1075 | |
f522d955 | 1076 | if (len < ISOTP_MIN_NAMELEN) |
e057dd3f OH |
1077 | return -EINVAL; |
1078 | ||
2b17c400 NS |
1079 | if (addr->can_addr.tp.tx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG)) |
1080 | return -EADDRNOTAVAIL; | |
1081 | ||
1082 | if (!addr->can_ifindex) | |
1083 | return -ENODEV; | |
1084 | ||
1085 | lock_sock(sk); | |
1086 | ||
921ca574 OH |
1087 | /* do not register frame reception for functional addressing */ |
1088 | if (so->opt.flags & CAN_ISOTP_SF_BROADCAST) | |
1089 | do_rx_reg = 0; | |
1090 | ||
1091 | /* do not validate rx address for functional addressing */ | |
1092 | if (do_rx_reg) { | |
2b17c400 NS |
1093 | if (addr->can_addr.tp.rx_id == addr->can_addr.tp.tx_id) { |
1094 | err = -EADDRNOTAVAIL; | |
1095 | goto out; | |
1096 | } | |
921ca574 | 1097 | |
2b17c400 NS |
1098 | if (addr->can_addr.tp.rx_id & (CAN_ERR_FLAG | CAN_RTR_FLAG)) { |
1099 | err = -EADDRNOTAVAIL; | |
1100 | goto out; | |
1101 | } | |
921ca574 | 1102 | } |
e057dd3f | 1103 | |
e057dd3f OH |
1104 | if (so->bound && addr->can_ifindex == so->ifindex && |
1105 | addr->can_addr.tp.rx_id == so->rxid && | |
1106 | addr->can_addr.tp.tx_id == so->txid) | |
1107 | goto out; | |
1108 | ||
1109 | dev = dev_get_by_index(net, addr->can_ifindex); | |
1110 | if (!dev) { | |
1111 | err = -ENODEV; | |
1112 | goto out; | |
1113 | } | |
1114 | if (dev->type != ARPHRD_CAN) { | |
1115 | dev_put(dev); | |
1116 | err = -ENODEV; | |
1117 | goto out; | |
1118 | } | |
1119 | if (dev->mtu < so->ll.mtu) { | |
1120 | dev_put(dev); | |
1121 | err = -EINVAL; | |
1122 | goto out; | |
1123 | } | |
1124 | if (!(dev->flags & IFF_UP)) | |
1125 | notify_enetdown = 1; | |
1126 | ||
1127 | ifindex = dev->ifindex; | |
1128 | ||
921ca574 OH |
1129 | if (do_rx_reg) |
1130 | can_rx_register(net, dev, addr->can_addr.tp.rx_id, | |
1131 | SINGLE_MASK(addr->can_addr.tp.rx_id), | |
1132 | isotp_rcv, sk, "isotp", sk); | |
e057dd3f OH |
1133 | |
1134 | dev_put(dev); | |
1135 | ||
921ca574 | 1136 | if (so->bound && do_rx_reg) { |
e057dd3f OH |
1137 | /* unregister old filter */ |
1138 | if (so->ifindex) { | |
1139 | dev = dev_get_by_index(net, so->ifindex); | |
1140 | if (dev) { | |
1141 | can_rx_unregister(net, dev, so->rxid, | |
1142 | SINGLE_MASK(so->rxid), | |
1143 | isotp_rcv, sk); | |
1144 | dev_put(dev); | |
1145 | } | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /* switch to new settings */ | |
1150 | so->ifindex = ifindex; | |
1151 | so->rxid = addr->can_addr.tp.rx_id; | |
1152 | so->txid = addr->can_addr.tp.tx_id; | |
1153 | so->bound = 1; | |
1154 | ||
1155 | out: | |
1156 | release_sock(sk); | |
1157 | ||
1158 | if (notify_enetdown) { | |
1159 | sk->sk_err = ENETDOWN; | |
1160 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1161 | sk_error_report(sk); |
e057dd3f OH |
1162 | } |
1163 | ||
1164 | return err; | |
1165 | } | |
1166 | ||
1167 | static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer) | |
1168 | { | |
1169 | struct sockaddr_can *addr = (struct sockaddr_can *)uaddr; | |
1170 | struct sock *sk = sock->sk; | |
1171 | struct isotp_sock *so = isotp_sk(sk); | |
1172 | ||
1173 | if (peer) | |
1174 | return -EOPNOTSUPP; | |
1175 | ||
f522d955 | 1176 | memset(addr, 0, ISOTP_MIN_NAMELEN); |
e057dd3f OH |
1177 | addr->can_family = AF_CAN; |
1178 | addr->can_ifindex = so->ifindex; | |
1179 | addr->can_addr.tp.rx_id = so->rxid; | |
1180 | addr->can_addr.tp.tx_id = so->txid; | |
1181 | ||
f522d955 | 1182 | return ISOTP_MIN_NAMELEN; |
e057dd3f OH |
1183 | } |
1184 | ||
2b17c400 | 1185 | static int isotp_setsockopt_locked(struct socket *sock, int level, int optname, |
e057dd3f OH |
1186 | sockptr_t optval, unsigned int optlen) |
1187 | { | |
1188 | struct sock *sk = sock->sk; | |
1189 | struct isotp_sock *so = isotp_sk(sk); | |
1190 | int ret = 0; | |
1191 | ||
323a391a OH |
1192 | if (so->bound) |
1193 | return -EISCONN; | |
1194 | ||
e057dd3f OH |
1195 | switch (optname) { |
1196 | case CAN_ISOTP_OPTS: | |
1197 | if (optlen != sizeof(struct can_isotp_options)) | |
1198 | return -EINVAL; | |
1199 | ||
1200 | if (copy_from_sockptr(&so->opt, optval, optlen)) | |
1201 | return -EFAULT; | |
1202 | ||
1203 | /* no separate rx_ext_address is given => use ext_address */ | |
1204 | if (!(so->opt.flags & CAN_ISOTP_RX_EXT_ADDR)) | |
1205 | so->opt.rx_ext_address = so->opt.ext_address; | |
1206 | break; | |
1207 | ||
1208 | case CAN_ISOTP_RECV_FC: | |
1209 | if (optlen != sizeof(struct can_isotp_fc_options)) | |
1210 | return -EINVAL; | |
1211 | ||
1212 | if (copy_from_sockptr(&so->rxfc, optval, optlen)) | |
1213 | return -EFAULT; | |
1214 | break; | |
1215 | ||
1216 | case CAN_ISOTP_TX_STMIN: | |
1217 | if (optlen != sizeof(u32)) | |
1218 | return -EINVAL; | |
1219 | ||
1220 | if (copy_from_sockptr(&so->force_tx_stmin, optval, optlen)) | |
1221 | return -EFAULT; | |
1222 | break; | |
1223 | ||
1224 | case CAN_ISOTP_RX_STMIN: | |
1225 | if (optlen != sizeof(u32)) | |
1226 | return -EINVAL; | |
1227 | ||
1228 | if (copy_from_sockptr(&so->force_rx_stmin, optval, optlen)) | |
1229 | return -EFAULT; | |
1230 | break; | |
1231 | ||
1232 | case CAN_ISOTP_LL_OPTS: | |
1233 | if (optlen == sizeof(struct can_isotp_ll_options)) { | |
1234 | struct can_isotp_ll_options ll; | |
1235 | ||
1236 | if (copy_from_sockptr(&ll, optval, optlen)) | |
1237 | return -EFAULT; | |
1238 | ||
1239 | /* check for correct ISO 11898-1 DLC data length */ | |
1240 | if (ll.tx_dl != padlen(ll.tx_dl)) | |
1241 | return -EINVAL; | |
1242 | ||
1243 | if (ll.mtu != CAN_MTU && ll.mtu != CANFD_MTU) | |
1244 | return -EINVAL; | |
1245 | ||
e4912459 MKB |
1246 | if (ll.mtu == CAN_MTU && |
1247 | (ll.tx_dl > CAN_MAX_DLEN || ll.tx_flags != 0)) | |
e057dd3f OH |
1248 | return -EINVAL; |
1249 | ||
1250 | memcpy(&so->ll, &ll, sizeof(ll)); | |
1251 | ||
1252 | /* set ll_dl for tx path to similar place as for rx */ | |
1253 | so->tx.ll_dl = ll.tx_dl; | |
1254 | } else { | |
1255 | return -EINVAL; | |
1256 | } | |
1257 | break; | |
1258 | ||
1259 | default: | |
1260 | ret = -ENOPROTOOPT; | |
1261 | } | |
1262 | ||
1263 | return ret; | |
1264 | } | |
1265 | ||
2b17c400 NS |
1266 | static int isotp_setsockopt(struct socket *sock, int level, int optname, |
1267 | sockptr_t optval, unsigned int optlen) | |
1268 | ||
1269 | { | |
1270 | struct sock *sk = sock->sk; | |
1271 | int ret; | |
1272 | ||
1273 | if (level != SOL_CAN_ISOTP) | |
1274 | return -EINVAL; | |
1275 | ||
1276 | lock_sock(sk); | |
1277 | ret = isotp_setsockopt_locked(sock, level, optname, optval, optlen); | |
1278 | release_sock(sk); | |
1279 | return ret; | |
1280 | } | |
1281 | ||
e057dd3f OH |
1282 | static int isotp_getsockopt(struct socket *sock, int level, int optname, |
1283 | char __user *optval, int __user *optlen) | |
1284 | { | |
1285 | struct sock *sk = sock->sk; | |
1286 | struct isotp_sock *so = isotp_sk(sk); | |
1287 | int len; | |
1288 | void *val; | |
1289 | ||
1290 | if (level != SOL_CAN_ISOTP) | |
1291 | return -EINVAL; | |
1292 | if (get_user(len, optlen)) | |
1293 | return -EFAULT; | |
1294 | if (len < 0) | |
1295 | return -EINVAL; | |
1296 | ||
1297 | switch (optname) { | |
1298 | case CAN_ISOTP_OPTS: | |
1299 | len = min_t(int, len, sizeof(struct can_isotp_options)); | |
1300 | val = &so->opt; | |
1301 | break; | |
1302 | ||
1303 | case CAN_ISOTP_RECV_FC: | |
1304 | len = min_t(int, len, sizeof(struct can_isotp_fc_options)); | |
1305 | val = &so->rxfc; | |
1306 | break; | |
1307 | ||
1308 | case CAN_ISOTP_TX_STMIN: | |
1309 | len = min_t(int, len, sizeof(u32)); | |
1310 | val = &so->force_tx_stmin; | |
1311 | break; | |
1312 | ||
1313 | case CAN_ISOTP_RX_STMIN: | |
1314 | len = min_t(int, len, sizeof(u32)); | |
1315 | val = &so->force_rx_stmin; | |
1316 | break; | |
1317 | ||
1318 | case CAN_ISOTP_LL_OPTS: | |
1319 | len = min_t(int, len, sizeof(struct can_isotp_ll_options)); | |
1320 | val = &so->ll; | |
1321 | break; | |
1322 | ||
1323 | default: | |
1324 | return -ENOPROTOOPT; | |
1325 | } | |
1326 | ||
1327 | if (put_user(len, optlen)) | |
1328 | return -EFAULT; | |
1329 | if (copy_to_user(optval, val, len)) | |
1330 | return -EFAULT; | |
1331 | return 0; | |
1332 | } | |
1333 | ||
8d0caedb TH |
1334 | static void isotp_notify(struct isotp_sock *so, unsigned long msg, |
1335 | struct net_device *dev) | |
e057dd3f | 1336 | { |
e057dd3f OH |
1337 | struct sock *sk = &so->sk; |
1338 | ||
1339 | if (!net_eq(dev_net(dev), sock_net(sk))) | |
8d0caedb | 1340 | return; |
e057dd3f OH |
1341 | |
1342 | if (so->ifindex != dev->ifindex) | |
8d0caedb | 1343 | return; |
e057dd3f OH |
1344 | |
1345 | switch (msg) { | |
1346 | case NETDEV_UNREGISTER: | |
1347 | lock_sock(sk); | |
1348 | /* remove current filters & unregister */ | |
921ca574 | 1349 | if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST))) |
e057dd3f OH |
1350 | can_rx_unregister(dev_net(dev), dev, so->rxid, |
1351 | SINGLE_MASK(so->rxid), | |
1352 | isotp_rcv, sk); | |
1353 | ||
1354 | so->ifindex = 0; | |
1355 | so->bound = 0; | |
1356 | release_sock(sk); | |
1357 | ||
1358 | sk->sk_err = ENODEV; | |
1359 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1360 | sk_error_report(sk); |
e057dd3f OH |
1361 | break; |
1362 | ||
1363 | case NETDEV_DOWN: | |
1364 | sk->sk_err = ENETDOWN; | |
1365 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1366 | sk_error_report(sk); |
e057dd3f OH |
1367 | break; |
1368 | } | |
8d0caedb | 1369 | } |
e057dd3f | 1370 | |
8d0caedb TH |
1371 | static int isotp_notifier(struct notifier_block *nb, unsigned long msg, |
1372 | void *ptr) | |
1373 | { | |
1374 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1375 | ||
1376 | if (dev->type != ARPHRD_CAN) | |
1377 | return NOTIFY_DONE; | |
1378 | if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN) | |
1379 | return NOTIFY_DONE; | |
1380 | if (unlikely(isotp_busy_notifier)) /* Check for reentrant bug. */ | |
1381 | return NOTIFY_DONE; | |
1382 | ||
1383 | spin_lock(&isotp_notifier_lock); | |
1384 | list_for_each_entry(isotp_busy_notifier, &isotp_notifier_list, notifier) { | |
1385 | spin_unlock(&isotp_notifier_lock); | |
1386 | isotp_notify(isotp_busy_notifier, msg, dev); | |
1387 | spin_lock(&isotp_notifier_lock); | |
1388 | } | |
1389 | isotp_busy_notifier = NULL; | |
1390 | spin_unlock(&isotp_notifier_lock); | |
e057dd3f OH |
1391 | return NOTIFY_DONE; |
1392 | } | |
1393 | ||
1394 | static int isotp_init(struct sock *sk) | |
1395 | { | |
1396 | struct isotp_sock *so = isotp_sk(sk); | |
1397 | ||
1398 | so->ifindex = 0; | |
1399 | so->bound = 0; | |
1400 | ||
1401 | so->opt.flags = CAN_ISOTP_DEFAULT_FLAGS; | |
1402 | so->opt.ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS; | |
1403 | so->opt.rx_ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS; | |
1404 | so->opt.rxpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT; | |
1405 | so->opt.txpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT; | |
1406 | so->opt.frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME; | |
1407 | so->rxfc.bs = CAN_ISOTP_DEFAULT_RECV_BS; | |
1408 | so->rxfc.stmin = CAN_ISOTP_DEFAULT_RECV_STMIN; | |
1409 | so->rxfc.wftmax = CAN_ISOTP_DEFAULT_RECV_WFTMAX; | |
1410 | so->ll.mtu = CAN_ISOTP_DEFAULT_LL_MTU; | |
1411 | so->ll.tx_dl = CAN_ISOTP_DEFAULT_LL_TX_DL; | |
1412 | so->ll.tx_flags = CAN_ISOTP_DEFAULT_LL_TX_FLAGS; | |
1413 | ||
1414 | /* set ll_dl for tx path to similar place as for rx */ | |
1415 | so->tx.ll_dl = so->ll.tx_dl; | |
1416 | ||
1417 | so->rx.state = ISOTP_IDLE; | |
1418 | so->tx.state = ISOTP_IDLE; | |
1419 | ||
1420 | hrtimer_init(&so->rxtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); | |
1421 | so->rxtimer.function = isotp_rx_timer_handler; | |
1422 | hrtimer_init(&so->txtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); | |
1423 | so->txtimer.function = isotp_tx_timer_handler; | |
1424 | ||
1425 | init_waitqueue_head(&so->wait); | |
1426 | ||
8d0caedb TH |
1427 | spin_lock(&isotp_notifier_lock); |
1428 | list_add_tail(&so->notifier, &isotp_notifier_list); | |
1429 | spin_unlock(&isotp_notifier_lock); | |
e057dd3f OH |
1430 | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int isotp_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd, | |
1435 | unsigned long arg) | |
1436 | { | |
1437 | /* no ioctls for socket layer -> hand it down to NIC layer */ | |
1438 | return -ENOIOCTLCMD; | |
1439 | } | |
1440 | ||
1441 | static const struct proto_ops isotp_ops = { | |
1442 | .family = PF_CAN, | |
1443 | .release = isotp_release, | |
1444 | .bind = isotp_bind, | |
1445 | .connect = sock_no_connect, | |
1446 | .socketpair = sock_no_socketpair, | |
1447 | .accept = sock_no_accept, | |
1448 | .getname = isotp_getname, | |
1449 | .poll = datagram_poll, | |
1450 | .ioctl = isotp_sock_no_ioctlcmd, | |
1451 | .gettstamp = sock_gettstamp, | |
1452 | .listen = sock_no_listen, | |
1453 | .shutdown = sock_no_shutdown, | |
1454 | .setsockopt = isotp_setsockopt, | |
1455 | .getsockopt = isotp_getsockopt, | |
1456 | .sendmsg = isotp_sendmsg, | |
1457 | .recvmsg = isotp_recvmsg, | |
1458 | .mmap = sock_no_mmap, | |
1459 | .sendpage = sock_no_sendpage, | |
1460 | }; | |
1461 | ||
1462 | static struct proto isotp_proto __read_mostly = { | |
1463 | .name = "CAN_ISOTP", | |
1464 | .owner = THIS_MODULE, | |
1465 | .obj_size = sizeof(struct isotp_sock), | |
1466 | .init = isotp_init, | |
1467 | }; | |
1468 | ||
1469 | static const struct can_proto isotp_can_proto = { | |
1470 | .type = SOCK_DGRAM, | |
1471 | .protocol = CAN_ISOTP, | |
1472 | .ops = &isotp_ops, | |
1473 | .prot = &isotp_proto, | |
1474 | }; | |
1475 | ||
8d0caedb TH |
1476 | static struct notifier_block canisotp_notifier = { |
1477 | .notifier_call = isotp_notifier | |
1478 | }; | |
1479 | ||
e057dd3f OH |
1480 | static __init int isotp_module_init(void) |
1481 | { | |
1482 | int err; | |
1483 | ||
f726f3d3 | 1484 | pr_info("can: isotp protocol\n"); |
e057dd3f OH |
1485 | |
1486 | err = can_proto_register(&isotp_can_proto); | |
1487 | if (err < 0) | |
6a5ddae5 | 1488 | pr_err("can: registration of isotp protocol failed %pe\n", ERR_PTR(err)); |
8d0caedb TH |
1489 | else |
1490 | register_netdevice_notifier(&canisotp_notifier); | |
e057dd3f OH |
1491 | |
1492 | return err; | |
1493 | } | |
1494 | ||
1495 | static __exit void isotp_module_exit(void) | |
1496 | { | |
1497 | can_proto_unregister(&isotp_can_proto); | |
8d0caedb | 1498 | unregister_netdevice_notifier(&canisotp_notifier); |
e057dd3f OH |
1499 | } |
1500 | ||
1501 | module_init(isotp_module_init); | |
1502 | module_exit(isotp_module_exit); |