1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 /* isotp.c - ISO 15765-2 CAN transport protocol for protocol family CAN
4 * This implementation does not provide ISO-TP specific return values to the
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')
18 * Copyright (c) 2020 Volkswagen Group Electronic Research
19 * All rights reserved.
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 * 3. Neither the name of Volkswagen nor the names of its contributors
30 * may be used to endorse or promote products derived from this software
31 * without specific prior written permission.
33 * Alternatively, provided that this notice is retained in full, this
34 * software may be distributed under the terms of the GNU General
35 * Public License ("GPL") version 2, in which case the provisions of the
36 * GPL apply INSTEAD OF those given above.
38 * The provided data structures and external interfaces from this code
39 * are not restricted to be used by modules with a GPL compatible license.
41 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
42 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
43 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
44 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
45 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
48 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
49 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
50 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
51 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
55 #include <linux/module.h>
56 #include <linux/init.h>
57 #include <linux/interrupt.h>
58 #include <linux/spinlock.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>
73 #include <net/net_namespace.h>
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");
80 #define ISOTP_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp)
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))
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 64 kbyte to be able to test this new functionality.
91 #define MAX_MSG_LENGTH 66000
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 */
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) */
106 #define ISOTP_CHECK_PADDING (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA)
107 #define ISOTP_ALL_BC_FLAGS (CAN_ISOTP_SF_BROADCAST | CAN_ISOTP_CF_BROADCAST)
109 /* Flow Status given in FC frame */
110 #define ISOTP_FC_CTS 0 /* clear to send */
111 #define ISOTP_FC_WT 1 /* wait */
112 #define ISOTP_FC_OVFLW 2 /* overflow */
114 #define ISOTP_FC_TIMEOUT 1 /* 1 sec */
115 #define ISOTP_ECHO_TIMEOUT 2 /* 2 secs */
132 u8 buf[MAX_MSG_LENGTH + 1];
142 ktime_t lastrxcf_tstamp;
143 struct hrtimer rxtimer, txtimer, txfrtimer;
144 struct can_isotp_options opt;
145 struct can_isotp_fc_options rxfc, txfc;
146 struct can_isotp_ll_options ll;
150 u32 cfecho; /* consecutive frame echo tag */
152 struct list_head notifier;
153 wait_queue_head_t wait;
154 spinlock_t rx_lock; /* protect single thread state machine */
157 static LIST_HEAD(isotp_notifier_list);
158 static DEFINE_SPINLOCK(isotp_notifier_lock);
159 static struct isotp_sock *isotp_busy_notifier;
161 static inline struct isotp_sock *isotp_sk(const struct sock *sk)
163 return (struct isotp_sock *)sk;
166 static u32 isotp_bc_flags(struct isotp_sock *so)
168 return so->opt.flags & ISOTP_ALL_BC_FLAGS;
171 static bool isotp_register_rxid(struct isotp_sock *so)
173 /* no broadcast modes => register rx_id for FC frame reception */
174 return (isotp_bc_flags(so) == 0);
177 static bool isotp_register_txecho(struct isotp_sock *so)
179 /* all modes but SF_BROADCAST register for tx echo skbs */
180 return (isotp_bc_flags(so) != CAN_ISOTP_SF_BROADCAST);
183 static enum hrtimer_restart isotp_rx_timer_handler(struct hrtimer *hrtimer)
185 struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
187 struct sock *sk = &so->sk;
189 if (so->rx.state == ISOTP_WAIT_DATA) {
190 /* we did not get new data frames in time */
192 /* report 'connection timed out' */
193 sk->sk_err = ETIMEDOUT;
194 if (!sock_flag(sk, SOCK_DEAD))
198 so->rx.state = ISOTP_IDLE;
201 return HRTIMER_NORESTART;
204 static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
206 struct net_device *dev;
207 struct sk_buff *nskb;
208 struct canfd_frame *ncf;
209 struct isotp_sock *so = isotp_sk(sk);
212 nskb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), gfp_any());
216 dev = dev_get_by_index(sock_net(sk), so->ifindex);
222 can_skb_reserve(nskb);
223 can_skb_prv(nskb)->ifindex = dev->ifindex;
224 can_skb_prv(nskb)->skbcnt = 0;
227 can_skb_set_owner(nskb, sk);
228 ncf = (struct canfd_frame *)nskb->data;
229 skb_put_zero(nskb, so->ll.mtu);
231 /* create & send flow control reply */
232 ncf->can_id = so->txid;
234 if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
235 memset(ncf->data, so->opt.txpad_content, CAN_MAX_DLEN);
236 ncf->len = CAN_MAX_DLEN;
238 ncf->len = ae + FC_CONTENT_SZ;
241 ncf->data[ae] = N_PCI_FC | flowstatus;
242 ncf->data[ae + 1] = so->rxfc.bs;
243 ncf->data[ae + 2] = so->rxfc.stmin;
246 ncf->data[0] = so->opt.ext_address;
248 ncf->flags = so->ll.tx_flags;
250 can_send_ret = can_send(nskb, 1);
252 pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
253 __func__, ERR_PTR(can_send_ret));
257 /* reset blocksize counter */
260 /* reset last CF frame rx timestamp for rx stmin enforcement */
261 so->lastrxcf_tstamp = ktime_set(0, 0);
263 /* start rx timeout watchdog */
264 hrtimer_start(&so->rxtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
265 HRTIMER_MODE_REL_SOFT);
269 static void isotp_rcv_skb(struct sk_buff *skb, struct sock *sk)
271 struct sockaddr_can *addr = (struct sockaddr_can *)skb->cb;
273 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
275 memset(addr, 0, sizeof(*addr));
276 addr->can_family = AF_CAN;
277 addr->can_ifindex = skb->dev->ifindex;
279 if (sock_queue_rcv_skb(sk, skb) < 0)
283 static u8 padlen(u8 datalen)
285 static const u8 plen[] = {
286 8, 8, 8, 8, 8, 8, 8, 8, 8, /* 0 - 8 */
287 12, 12, 12, 12, /* 9 - 12 */
288 16, 16, 16, 16, /* 13 - 16 */
289 20, 20, 20, 20, /* 17 - 20 */
290 24, 24, 24, 24, /* 21 - 24 */
291 32, 32, 32, 32, 32, 32, 32, 32, /* 25 - 32 */
292 48, 48, 48, 48, 48, 48, 48, 48, /* 33 - 40 */
293 48, 48, 48, 48, 48, 48, 48, 48 /* 41 - 48 */
299 return plen[datalen];
302 /* check for length optimization and return 1/true when the check fails */
303 static int check_optimized(struct canfd_frame *cf, int start_index)
305 /* for CAN_DL <= 8 the start_index is equal to the CAN_DL as the
306 * padding would start at this point. E.g. if the padding would
307 * start at cf.data[7] cf->len has to be 7 to be optimal.
308 * Note: The data[] index starts with zero.
310 if (cf->len <= CAN_MAX_DLEN)
311 return (cf->len != start_index);
313 /* This relation is also valid in the non-linear DLC range, where
314 * we need to take care of the minimal next possible CAN_DL.
315 * The correct check would be (padlen(cf->len) != padlen(start_index)).
316 * But as cf->len can only take discrete values from 12, .., 64 at this
317 * point the padlen(cf->len) is always equal to cf->len.
319 return (cf->len != padlen(start_index));
322 /* check padding and return 1/true when the check fails */
323 static int check_pad(struct isotp_sock *so, struct canfd_frame *cf,
324 int start_index, u8 content)
328 /* no RX_PADDING value => check length of optimized frame length */
329 if (!(so->opt.flags & CAN_ISOTP_RX_PADDING)) {
330 if (so->opt.flags & CAN_ISOTP_CHK_PAD_LEN)
331 return check_optimized(cf, start_index);
333 /* no valid test against empty value => ignore frame */
337 /* check datalength of correctly padded CAN frame */
338 if ((so->opt.flags & CAN_ISOTP_CHK_PAD_LEN) &&
339 cf->len != padlen(cf->len))
342 /* check padding content */
343 if (so->opt.flags & CAN_ISOTP_CHK_PAD_DATA) {
344 for (i = start_index; i < cf->len; i++)
345 if (cf->data[i] != content)
351 static void isotp_send_cframe(struct isotp_sock *so);
353 static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae)
355 struct sock *sk = &so->sk;
357 if (so->tx.state != ISOTP_WAIT_FC &&
358 so->tx.state != ISOTP_WAIT_FIRST_FC)
361 hrtimer_cancel(&so->txtimer);
363 if ((cf->len < ae + FC_CONTENT_SZ) ||
364 ((so->opt.flags & ISOTP_CHECK_PADDING) &&
365 check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) {
366 /* malformed PDU - report 'not a data message' */
367 sk->sk_err = EBADMSG;
368 if (!sock_flag(sk, SOCK_DEAD))
371 so->tx.state = ISOTP_IDLE;
372 wake_up_interruptible(&so->wait);
376 /* get communication parameters only from the first FC frame */
377 if (so->tx.state == ISOTP_WAIT_FIRST_FC) {
378 so->txfc.bs = cf->data[ae + 1];
379 so->txfc.stmin = cf->data[ae + 2];
381 /* fix wrong STmin values according spec */
382 if (so->txfc.stmin > 0x7F &&
383 (so->txfc.stmin < 0xF1 || so->txfc.stmin > 0xF9))
384 so->txfc.stmin = 0x7F;
386 so->tx_gap = ktime_set(0, 0);
387 /* add transmission time for CAN frame N_As */
388 so->tx_gap = ktime_add_ns(so->tx_gap, so->frame_txtime);
389 /* add waiting time for consecutive frames N_Cs */
390 if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN)
391 so->tx_gap = ktime_add_ns(so->tx_gap,
393 else if (so->txfc.stmin < 0x80)
394 so->tx_gap = ktime_add_ns(so->tx_gap,
395 so->txfc.stmin * 1000000);
397 so->tx_gap = ktime_add_ns(so->tx_gap,
398 (so->txfc.stmin - 0xF0)
400 so->tx.state = ISOTP_WAIT_FC;
403 switch (cf->data[ae] & 0x0F) {
406 so->tx.state = ISOTP_SENDING;
407 /* send CF frame and enable echo timeout handling */
408 hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
409 HRTIMER_MODE_REL_SOFT);
410 isotp_send_cframe(so);
414 /* start timer to wait for next FC frame */
415 hrtimer_start(&so->txtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
416 HRTIMER_MODE_REL_SOFT);
420 /* overflow on receiver side - report 'message too long' */
421 sk->sk_err = EMSGSIZE;
422 if (!sock_flag(sk, SOCK_DEAD))
427 /* stop this tx job */
428 so->tx.state = ISOTP_IDLE;
429 wake_up_interruptible(&so->wait);
434 static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen,
435 struct sk_buff *skb, int len)
437 struct isotp_sock *so = isotp_sk(sk);
438 struct sk_buff *nskb;
440 hrtimer_cancel(&so->rxtimer);
441 so->rx.state = ISOTP_IDLE;
443 if (!len || len > cf->len - pcilen)
446 if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
447 check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) {
448 /* malformed PDU - report 'not a data message' */
449 sk->sk_err = EBADMSG;
450 if (!sock_flag(sk, SOCK_DEAD))
455 nskb = alloc_skb(len, gfp_any());
459 memcpy(skb_put(nskb, len), &cf->data[pcilen], len);
461 nskb->tstamp = skb->tstamp;
462 nskb->dev = skb->dev;
463 isotp_rcv_skb(nskb, sk);
467 static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae)
469 struct isotp_sock *so = isotp_sk(sk);
474 hrtimer_cancel(&so->rxtimer);
475 so->rx.state = ISOTP_IDLE;
477 /* get the used sender LL_DL from the (first) CAN frame data length */
478 so->rx.ll_dl = padlen(cf->len);
480 /* the first frame has to use the entire frame up to LL_DL length */
481 if (cf->len != so->rx.ll_dl)
485 so->rx.len = (cf->data[ae] & 0x0F) << 8;
486 so->rx.len += cf->data[ae + 1];
488 /* Check for FF_DL escape sequence supporting 32 bit PDU length */
490 ff_pci_sz = FF_PCI_SZ12;
492 /* FF_DL = 0 => get real length from next 4 bytes */
493 so->rx.len = cf->data[ae + 2] << 24;
494 so->rx.len += cf->data[ae + 3] << 16;
495 so->rx.len += cf->data[ae + 4] << 8;
496 so->rx.len += cf->data[ae + 5];
497 ff_pci_sz = FF_PCI_SZ32;
500 /* take care of a potential SF_DL ESC offset for TX_DL > 8 */
501 off = (so->rx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
503 if (so->rx.len + ae + off + ff_pci_sz < so->rx.ll_dl)
506 if (so->rx.len > MAX_MSG_LENGTH) {
507 /* send FC frame with overflow status */
508 isotp_send_fc(sk, ae, ISOTP_FC_OVFLW);
512 /* copy the first received data bytes */
514 for (i = ae + ff_pci_sz; i < so->rx.ll_dl; i++)
515 so->rx.buf[so->rx.idx++] = cf->data[i];
517 /* initial setup for this pdu reception */
519 so->rx.state = ISOTP_WAIT_DATA;
521 /* no creation of flow control frames */
522 if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
525 /* send our first FC frame */
526 isotp_send_fc(sk, ae, ISOTP_FC_CTS);
530 static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae,
533 struct isotp_sock *so = isotp_sk(sk);
534 struct sk_buff *nskb;
537 if (so->rx.state != ISOTP_WAIT_DATA)
540 /* drop if timestamp gap is less than force_rx_stmin nano secs */
541 if (so->opt.flags & CAN_ISOTP_FORCE_RXSTMIN) {
542 if (ktime_to_ns(ktime_sub(skb->tstamp, so->lastrxcf_tstamp)) <
546 so->lastrxcf_tstamp = skb->tstamp;
549 hrtimer_cancel(&so->rxtimer);
551 /* CFs are never longer than the FF */
552 if (cf->len > so->rx.ll_dl)
555 /* CFs have usually the LL_DL length */
556 if (cf->len < so->rx.ll_dl) {
557 /* this is only allowed for the last CF */
558 if (so->rx.len - so->rx.idx > so->rx.ll_dl - ae - N_PCI_SZ)
562 if ((cf->data[ae] & 0x0F) != so->rx.sn) {
563 /* wrong sn detected - report 'illegal byte sequence' */
565 if (!sock_flag(sk, SOCK_DEAD))
569 so->rx.state = ISOTP_IDLE;
575 for (i = ae + N_PCI_SZ; i < cf->len; i++) {
576 so->rx.buf[so->rx.idx++] = cf->data[i];
577 if (so->rx.idx >= so->rx.len)
581 if (so->rx.idx >= so->rx.len) {
583 so->rx.state = ISOTP_IDLE;
585 if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
586 check_pad(so, cf, i + 1, so->opt.rxpad_content)) {
587 /* malformed PDU - report 'not a data message' */
588 sk->sk_err = EBADMSG;
589 if (!sock_flag(sk, SOCK_DEAD))
594 nskb = alloc_skb(so->rx.len, gfp_any());
598 memcpy(skb_put(nskb, so->rx.len), so->rx.buf,
601 nskb->tstamp = skb->tstamp;
602 nskb->dev = skb->dev;
603 isotp_rcv_skb(nskb, sk);
607 /* perform blocksize handling, if enabled */
608 if (!so->rxfc.bs || ++so->rx.bs < so->rxfc.bs) {
609 /* start rx timeout watchdog */
610 hrtimer_start(&so->rxtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
611 HRTIMER_MODE_REL_SOFT);
615 /* no creation of flow control frames */
616 if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
619 /* we reached the specified blocksize so->rxfc.bs */
620 isotp_send_fc(sk, ae, ISOTP_FC_CTS);
624 static void isotp_rcv(struct sk_buff *skb, void *data)
626 struct sock *sk = (struct sock *)data;
627 struct isotp_sock *so = isotp_sk(sk);
628 struct canfd_frame *cf;
629 int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
630 u8 n_pci_type, sf_dl;
632 /* Strictly receive only frames with the configured MTU size
633 * => clear separation of CAN2.0 / CAN FD transport channels
635 if (skb->len != so->ll.mtu)
638 cf = (struct canfd_frame *)skb->data;
640 /* if enabled: check reception of my configured extended address */
641 if (ae && cf->data[0] != so->opt.rx_ext_address)
644 n_pci_type = cf->data[ae] & 0xF0;
646 /* Make sure the state changes and data structures stay consistent at
647 * CAN frame reception time. This locking is not needed in real world
648 * use cases but the inconsistency can be triggered with syzkaller.
650 spin_lock(&so->rx_lock);
652 if (so->opt.flags & CAN_ISOTP_HALF_DUPLEX) {
653 /* check rx/tx path half duplex expectations */
654 if ((so->tx.state != ISOTP_IDLE && n_pci_type != N_PCI_FC) ||
655 (so->rx.state != ISOTP_IDLE && n_pci_type == N_PCI_FC))
659 switch (n_pci_type) {
661 /* tx path: flow control frame containing the FC parameters */
662 isotp_rcv_fc(so, cf, ae);
666 /* rx path: single frame
668 * As we do not have a rx.ll_dl configuration, we can only test
669 * if the CAN frames payload length matches the LL_DL == 8
670 * requirements - no matter if it's CAN 2.0 or CAN FD
673 /* get the SF_DL from the N_PCI byte */
674 sf_dl = cf->data[ae] & 0x0F;
676 if (cf->len <= CAN_MAX_DLEN) {
677 isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl);
679 if (can_is_canfd_skb(skb)) {
680 /* We have a CAN FD frame and CAN_DL is greater than 8:
681 * Only frames with the SF_DL == 0 ESC value are valid.
683 * If so take care of the increased SF PCI size
684 * (SF_PCI_SZ8) to point to the message content behind
685 * the extended SF PCI info and get the real SF_DL
686 * length value from the formerly first data byte.
689 isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb,
690 cf->data[SF_PCI_SZ4 + ae]);
696 /* rx path: first frame */
697 isotp_rcv_ff(sk, cf, ae);
701 /* rx path: consecutive frame */
702 isotp_rcv_cf(sk, cf, ae, skb);
707 spin_unlock(&so->rx_lock);
710 static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so,
713 int pcilen = N_PCI_SZ + ae + off;
714 int space = so->tx.ll_dl - pcilen;
715 int num = min_t(int, so->tx.len - so->tx.idx, space);
718 cf->can_id = so->txid;
719 cf->len = num + pcilen;
722 if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
723 /* user requested padding */
724 cf->len = padlen(cf->len);
725 memset(cf->data, so->opt.txpad_content, cf->len);
726 } else if (cf->len > CAN_MAX_DLEN) {
727 /* mandatory padding for CAN FD frames */
728 cf->len = padlen(cf->len);
729 memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT,
734 for (i = 0; i < num; i++)
735 cf->data[pcilen + i] = so->tx.buf[so->tx.idx++];
738 cf->data[0] = so->opt.ext_address;
741 static void isotp_send_cframe(struct isotp_sock *so)
743 struct sock *sk = &so->sk;
745 struct net_device *dev;
746 struct canfd_frame *cf;
748 int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
750 dev = dev_get_by_index(sock_net(sk), so->ifindex);
754 skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), GFP_ATOMIC);
760 can_skb_reserve(skb);
761 can_skb_prv(skb)->ifindex = dev->ifindex;
762 can_skb_prv(skb)->skbcnt = 0;
764 cf = (struct canfd_frame *)skb->data;
765 skb_put_zero(skb, so->ll.mtu);
767 /* create consecutive frame */
768 isotp_fill_dataframe(cf, so, ae, 0);
770 /* place consecutive frame N_PCI in appropriate index */
771 cf->data[ae] = N_PCI_CF | so->tx.sn++;
775 cf->flags = so->ll.tx_flags;
778 can_skb_set_owner(skb, sk);
780 /* cfecho should have been zero'ed by init/isotp_rcv_echo() */
782 pr_notice_once("can-isotp: cfecho is %08X != 0\n", so->cfecho);
784 /* set consecutive frame echo tag */
785 so->cfecho = *(u32 *)cf->data;
787 /* send frame with local echo enabled */
788 can_send_ret = can_send(skb, 1);
790 pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
791 __func__, ERR_PTR(can_send_ret));
792 if (can_send_ret == -ENOBUFS)
793 pr_notice_once("can-isotp: tx queue is full\n");
798 static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so,
804 cf->can_id = so->txid;
805 cf->len = so->tx.ll_dl;
807 cf->data[0] = so->opt.ext_address;
809 /* create N_PCI bytes with 12/32 bit FF_DL data length */
810 if (so->tx.len > 4095) {
811 /* use 32 bit FF_DL notation */
812 cf->data[ae] = N_PCI_FF;
813 cf->data[ae + 1] = 0;
814 cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU;
815 cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU;
816 cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU;
817 cf->data[ae + 5] = (u8)so->tx.len & 0xFFU;
818 ff_pci_sz = FF_PCI_SZ32;
820 /* use 12 bit FF_DL notation */
821 cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF;
822 cf->data[ae + 1] = (u8)so->tx.len & 0xFFU;
823 ff_pci_sz = FF_PCI_SZ12;
826 /* add first data bytes depending on ae */
827 for (i = ae + ff_pci_sz; i < so->tx.ll_dl; i++)
828 cf->data[i] = so->tx.buf[so->tx.idx++];
833 static void isotp_rcv_echo(struct sk_buff *skb, void *data)
835 struct sock *sk = (struct sock *)data;
836 struct isotp_sock *so = isotp_sk(sk);
837 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
839 /* only handle my own local echo CF/SF skb's (no FF!) */
840 if (skb->sk != sk || so->cfecho != *(u32 *)cf->data)
843 /* cancel local echo timeout */
844 hrtimer_cancel(&so->txtimer);
846 /* local echo skb with consecutive frame has been consumed */
849 if (so->tx.idx >= so->tx.len) {
851 so->tx.state = ISOTP_IDLE;
852 wake_up_interruptible(&so->wait);
856 if (so->txfc.bs && so->tx.bs >= so->txfc.bs) {
857 /* stop and wait for FC with timeout */
858 so->tx.state = ISOTP_WAIT_FC;
859 hrtimer_start(&so->txtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
860 HRTIMER_MODE_REL_SOFT);
864 /* no gap between data frames needed => use burst mode */
866 /* enable echo timeout handling */
867 hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
868 HRTIMER_MODE_REL_SOFT);
869 isotp_send_cframe(so);
873 /* start timer to send next consecutive frame with correct delay */
874 hrtimer_start(&so->txfrtimer, so->tx_gap, HRTIMER_MODE_REL_SOFT);
877 static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
879 struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
881 struct sock *sk = &so->sk;
883 /* don't handle timeouts in IDLE state */
884 if (so->tx.state == ISOTP_IDLE)
885 return HRTIMER_NORESTART;
887 /* we did not get any flow control or echo frame in time */
889 /* report 'communication error on send' */
891 if (!sock_flag(sk, SOCK_DEAD))
895 so->tx.state = ISOTP_IDLE;
896 wake_up_interruptible(&so->wait);
898 return HRTIMER_NORESTART;
901 static enum hrtimer_restart isotp_txfr_timer_handler(struct hrtimer *hrtimer)
903 struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
906 /* start echo timeout handling and cover below protocol error */
907 hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
908 HRTIMER_MODE_REL_SOFT);
910 /* cfecho should be consumed by isotp_rcv_echo() here */
911 if (so->tx.state == ISOTP_SENDING && !so->cfecho)
912 isotp_send_cframe(so);
914 return HRTIMER_NORESTART;
917 static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
919 struct sock *sk = sock->sk;
920 struct isotp_sock *so = isotp_sk(sk);
921 u32 old_state = so->tx.state;
923 struct net_device *dev;
924 struct canfd_frame *cf;
925 int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
926 int wait_tx_done = (so->opt.flags & CAN_ISOTP_WAIT_TX_DONE) ? 1 : 0;
927 s64 hrtimer_sec = ISOTP_ECHO_TIMEOUT;
932 return -EADDRNOTAVAIL;
934 /* we do not support multiple buffers - for now */
935 if (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE ||
936 wq_has_sleeper(&so->wait)) {
937 if (msg->msg_flags & MSG_DONTWAIT) {
942 /* wait for complete transmission of current pdu */
943 err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
947 so->tx.state = ISOTP_SENDING;
950 if (!size || size > MAX_MSG_LENGTH) {
955 /* take care of a potential SF_DL ESC offset for TX_DL > 8 */
956 off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
958 /* does the given data fit into a single frame for SF_BROADCAST? */
959 if ((isotp_bc_flags(so) == CAN_ISOTP_SF_BROADCAST) &&
960 (size > so->tx.ll_dl - SF_PCI_SZ4 - ae - off)) {
965 err = memcpy_from_msg(so->tx.buf, msg, size);
969 dev = dev_get_by_index(sock_net(sk), so->ifindex);
975 skb = sock_alloc_send_skb(sk, so->ll.mtu + sizeof(struct can_skb_priv),
976 msg->msg_flags & MSG_DONTWAIT, &err);
982 can_skb_reserve(skb);
983 can_skb_prv(skb)->ifindex = dev->ifindex;
984 can_skb_prv(skb)->skbcnt = 0;
989 cf = (struct canfd_frame *)skb->data;
990 skb_put_zero(skb, so->ll.mtu);
992 /* cfecho should have been zero'ed by init / former isotp_rcv_echo() */
994 pr_notice_once("can-isotp: uninit cfecho %08X\n", so->cfecho);
996 /* check for single frame transmission depending on TX_DL */
997 if (size <= so->tx.ll_dl - SF_PCI_SZ4 - ae - off) {
998 /* The message size generally fits into a SingleFrame - good.
1000 * SF_DL ESC offset optimization:
1002 * When TX_DL is greater 8 but the message would still fit
1003 * into a 8 byte CAN frame, we can omit the offset.
1004 * This prevents a protocol caused length extension from
1005 * CAN_DL = 8 to CAN_DL = 12 due to the SF_SL ESC handling.
1007 if (size <= CAN_MAX_DLEN - SF_PCI_SZ4 - ae)
1010 isotp_fill_dataframe(cf, so, ae, off);
1012 /* place single frame N_PCI w/o length in appropriate index */
1013 cf->data[ae] = N_PCI_SF;
1015 /* place SF_DL size value depending on the SF_DL ESC offset */
1017 cf->data[SF_PCI_SZ4 + ae] = size;
1019 cf->data[ae] |= size;
1021 /* set CF echo tag for isotp_rcv_echo() (SF-mode) */
1022 so->cfecho = *(u32 *)cf->data;
1024 /* send first frame */
1026 isotp_create_fframe(cf, so, ae);
1028 if (isotp_bc_flags(so) == CAN_ISOTP_CF_BROADCAST) {
1029 /* set timer for FC-less operation (STmin = 0) */
1030 if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN)
1031 so->tx_gap = ktime_set(0, so->force_tx_stmin);
1033 so->tx_gap = ktime_set(0, so->frame_txtime);
1035 /* disable wait for FCs due to activated block size */
1038 /* set CF echo tag for isotp_rcv_echo() (CF-mode) */
1039 so->cfecho = *(u32 *)cf->data;
1041 /* standard flow control check */
1042 so->tx.state = ISOTP_WAIT_FIRST_FC;
1044 /* start timeout for FC */
1045 hrtimer_sec = ISOTP_FC_TIMEOUT;
1047 /* no CF echo tag for isotp_rcv_echo() (FF-mode) */
1052 hrtimer_start(&so->txtimer, ktime_set(hrtimer_sec, 0),
1053 HRTIMER_MODE_REL_SOFT);
1055 /* send the first or only CAN frame */
1056 cf->flags = so->ll.tx_flags;
1060 err = can_send(skb, 1);
1063 pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
1064 __func__, ERR_PTR(err));
1066 /* no transmission -> no timeout monitoring */
1067 hrtimer_cancel(&so->txtimer);
1069 /* reset consecutive frame echo tag */
1076 /* wait for complete transmission of current pdu */
1077 wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
1086 /* drop this PDU and unlock a potential wait queue */
1087 old_state = ISOTP_IDLE;
1089 so->tx.state = old_state;
1090 if (so->tx.state == ISOTP_IDLE)
1091 wake_up_interruptible(&so->wait);
1096 static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1099 struct sock *sk = sock->sk;
1100 struct sk_buff *skb;
1101 struct isotp_sock *so = isotp_sk(sk);
1104 if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
1108 return -EADDRNOTAVAIL;
1110 skb = skb_recv_datagram(sk, flags, &ret);
1114 if (size < skb->len)
1115 msg->msg_flags |= MSG_TRUNC;
1119 ret = memcpy_to_msg(msg, skb->data, size);
1123 sock_recv_timestamp(msg, sk, skb);
1125 if (msg->msg_name) {
1126 __sockaddr_check_size(ISOTP_MIN_NAMELEN);
1127 msg->msg_namelen = ISOTP_MIN_NAMELEN;
1128 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1131 /* set length of return value */
1132 ret = (flags & MSG_TRUNC) ? skb->len : size;
1135 skb_free_datagram(sk, skb);
1140 static int isotp_release(struct socket *sock)
1142 struct sock *sk = sock->sk;
1143 struct isotp_sock *so;
1152 /* wait for complete transmission of current pdu */
1153 wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
1155 /* force state machines to be idle also when a signal occurred */
1156 so->tx.state = ISOTP_IDLE;
1157 so->rx.state = ISOTP_IDLE;
1159 spin_lock(&isotp_notifier_lock);
1160 while (isotp_busy_notifier == so) {
1161 spin_unlock(&isotp_notifier_lock);
1162 schedule_timeout_uninterruptible(1);
1163 spin_lock(&isotp_notifier_lock);
1165 list_del(&so->notifier);
1166 spin_unlock(&isotp_notifier_lock);
1170 /* remove current filters & unregister */
1171 if (so->bound && isotp_register_txecho(so)) {
1173 struct net_device *dev;
1175 dev = dev_get_by_index(net, so->ifindex);
1177 if (isotp_register_rxid(so))
1178 can_rx_unregister(net, dev, so->rxid,
1179 SINGLE_MASK(so->rxid),
1182 can_rx_unregister(net, dev, so->txid,
1183 SINGLE_MASK(so->txid),
1184 isotp_rcv_echo, sk);
1191 hrtimer_cancel(&so->txfrtimer);
1192 hrtimer_cancel(&so->txtimer);
1193 hrtimer_cancel(&so->rxtimer);
1207 static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
1209 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1210 struct sock *sk = sock->sk;
1211 struct isotp_sock *so = isotp_sk(sk);
1212 struct net *net = sock_net(sk);
1214 struct net_device *dev;
1215 canid_t tx_id = addr->can_addr.tp.tx_id;
1216 canid_t rx_id = addr->can_addr.tp.rx_id;
1218 int notify_enetdown = 0;
1220 if (len < ISOTP_MIN_NAMELEN)
1223 if (addr->can_family != AF_CAN)
1226 /* sanitize tx CAN identifier */
1227 if (tx_id & CAN_EFF_FLAG)
1228 tx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
1230 tx_id &= CAN_SFF_MASK;
1232 /* give feedback on wrong CAN-ID value */
1233 if (tx_id != addr->can_addr.tp.tx_id)
1236 /* sanitize rx CAN identifier (if needed) */
1237 if (isotp_register_rxid(so)) {
1238 if (rx_id & CAN_EFF_FLAG)
1239 rx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
1241 rx_id &= CAN_SFF_MASK;
1243 /* give feedback on wrong CAN-ID value */
1244 if (rx_id != addr->can_addr.tp.rx_id)
1248 if (!addr->can_ifindex)
1258 /* ensure different CAN IDs when the rx_id is to be registered */
1259 if (isotp_register_rxid(so) && rx_id == tx_id) {
1260 err = -EADDRNOTAVAIL;
1264 dev = dev_get_by_index(net, addr->can_ifindex);
1269 if (dev->type != ARPHRD_CAN) {
1274 if (dev->mtu < so->ll.mtu) {
1279 if (!(dev->flags & IFF_UP))
1280 notify_enetdown = 1;
1282 ifindex = dev->ifindex;
1284 if (isotp_register_rxid(so))
1285 can_rx_register(net, dev, rx_id, SINGLE_MASK(rx_id),
1286 isotp_rcv, sk, "isotp", sk);
1288 if (isotp_register_txecho(so)) {
1289 /* no consecutive frame echo skb in flight */
1292 /* register for echo skb's */
1293 can_rx_register(net, dev, tx_id, SINGLE_MASK(tx_id),
1294 isotp_rcv_echo, sk, "isotpe", sk);
1299 /* switch to new settings */
1300 so->ifindex = ifindex;
1308 if (notify_enetdown) {
1309 sk->sk_err = ENETDOWN;
1310 if (!sock_flag(sk, SOCK_DEAD))
1311 sk_error_report(sk);
1317 static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
1319 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
1320 struct sock *sk = sock->sk;
1321 struct isotp_sock *so = isotp_sk(sk);
1326 memset(addr, 0, ISOTP_MIN_NAMELEN);
1327 addr->can_family = AF_CAN;
1328 addr->can_ifindex = so->ifindex;
1329 addr->can_addr.tp.rx_id = so->rxid;
1330 addr->can_addr.tp.tx_id = so->txid;
1332 return ISOTP_MIN_NAMELEN;
1335 static int isotp_setsockopt_locked(struct socket *sock, int level, int optname,
1336 sockptr_t optval, unsigned int optlen)
1338 struct sock *sk = sock->sk;
1339 struct isotp_sock *so = isotp_sk(sk);
1346 case CAN_ISOTP_OPTS:
1347 if (optlen != sizeof(struct can_isotp_options))
1350 if (copy_from_sockptr(&so->opt, optval, optlen))
1353 /* no separate rx_ext_address is given => use ext_address */
1354 if (!(so->opt.flags & CAN_ISOTP_RX_EXT_ADDR))
1355 so->opt.rx_ext_address = so->opt.ext_address;
1357 /* these broadcast flags are not allowed together */
1358 if (isotp_bc_flags(so) == ISOTP_ALL_BC_FLAGS) {
1359 /* CAN_ISOTP_SF_BROADCAST is prioritized */
1360 so->opt.flags &= ~CAN_ISOTP_CF_BROADCAST;
1362 /* give user feedback on wrong config attempt */
1366 /* check for frame_txtime changes (0 => no changes) */
1367 if (so->opt.frame_txtime) {
1368 if (so->opt.frame_txtime == CAN_ISOTP_FRAME_TXTIME_ZERO)
1369 so->frame_txtime = 0;
1371 so->frame_txtime = so->opt.frame_txtime;
1375 case CAN_ISOTP_RECV_FC:
1376 if (optlen != sizeof(struct can_isotp_fc_options))
1379 if (copy_from_sockptr(&so->rxfc, optval, optlen))
1383 case CAN_ISOTP_TX_STMIN:
1384 if (optlen != sizeof(u32))
1387 if (copy_from_sockptr(&so->force_tx_stmin, optval, optlen))
1391 case CAN_ISOTP_RX_STMIN:
1392 if (optlen != sizeof(u32))
1395 if (copy_from_sockptr(&so->force_rx_stmin, optval, optlen))
1399 case CAN_ISOTP_LL_OPTS:
1400 if (optlen == sizeof(struct can_isotp_ll_options)) {
1401 struct can_isotp_ll_options ll;
1403 if (copy_from_sockptr(&ll, optval, optlen))
1406 /* check for correct ISO 11898-1 DLC data length */
1407 if (ll.tx_dl != padlen(ll.tx_dl))
1410 if (ll.mtu != CAN_MTU && ll.mtu != CANFD_MTU)
1413 if (ll.mtu == CAN_MTU &&
1414 (ll.tx_dl > CAN_MAX_DLEN || ll.tx_flags != 0))
1417 memcpy(&so->ll, &ll, sizeof(ll));
1419 /* set ll_dl for tx path to similar place as for rx */
1420 so->tx.ll_dl = ll.tx_dl;
1433 static int isotp_setsockopt(struct socket *sock, int level, int optname,
1434 sockptr_t optval, unsigned int optlen)
1437 struct sock *sk = sock->sk;
1440 if (level != SOL_CAN_ISOTP)
1444 ret = isotp_setsockopt_locked(sock, level, optname, optval, optlen);
1449 static int isotp_getsockopt(struct socket *sock, int level, int optname,
1450 char __user *optval, int __user *optlen)
1452 struct sock *sk = sock->sk;
1453 struct isotp_sock *so = isotp_sk(sk);
1457 if (level != SOL_CAN_ISOTP)
1459 if (get_user(len, optlen))
1465 case CAN_ISOTP_OPTS:
1466 len = min_t(int, len, sizeof(struct can_isotp_options));
1470 case CAN_ISOTP_RECV_FC:
1471 len = min_t(int, len, sizeof(struct can_isotp_fc_options));
1475 case CAN_ISOTP_TX_STMIN:
1476 len = min_t(int, len, sizeof(u32));
1477 val = &so->force_tx_stmin;
1480 case CAN_ISOTP_RX_STMIN:
1481 len = min_t(int, len, sizeof(u32));
1482 val = &so->force_rx_stmin;
1485 case CAN_ISOTP_LL_OPTS:
1486 len = min_t(int, len, sizeof(struct can_isotp_ll_options));
1491 return -ENOPROTOOPT;
1494 if (put_user(len, optlen))
1496 if (copy_to_user(optval, val, len))
1501 static void isotp_notify(struct isotp_sock *so, unsigned long msg,
1502 struct net_device *dev)
1504 struct sock *sk = &so->sk;
1506 if (!net_eq(dev_net(dev), sock_net(sk)))
1509 if (so->ifindex != dev->ifindex)
1513 case NETDEV_UNREGISTER:
1515 /* remove current filters & unregister */
1516 if (so->bound && isotp_register_txecho(so)) {
1517 if (isotp_register_rxid(so))
1518 can_rx_unregister(dev_net(dev), dev, so->rxid,
1519 SINGLE_MASK(so->rxid),
1522 can_rx_unregister(dev_net(dev), dev, so->txid,
1523 SINGLE_MASK(so->txid),
1524 isotp_rcv_echo, sk);
1531 sk->sk_err = ENODEV;
1532 if (!sock_flag(sk, SOCK_DEAD))
1533 sk_error_report(sk);
1537 sk->sk_err = ENETDOWN;
1538 if (!sock_flag(sk, SOCK_DEAD))
1539 sk_error_report(sk);
1544 static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
1547 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1549 if (dev->type != ARPHRD_CAN)
1551 if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
1553 if (unlikely(isotp_busy_notifier)) /* Check for reentrant bug. */
1556 spin_lock(&isotp_notifier_lock);
1557 list_for_each_entry(isotp_busy_notifier, &isotp_notifier_list, notifier) {
1558 spin_unlock(&isotp_notifier_lock);
1559 isotp_notify(isotp_busy_notifier, msg, dev);
1560 spin_lock(&isotp_notifier_lock);
1562 isotp_busy_notifier = NULL;
1563 spin_unlock(&isotp_notifier_lock);
1567 static int isotp_init(struct sock *sk)
1569 struct isotp_sock *so = isotp_sk(sk);
1574 so->opt.flags = CAN_ISOTP_DEFAULT_FLAGS;
1575 so->opt.ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
1576 so->opt.rx_ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
1577 so->opt.rxpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
1578 so->opt.txpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
1579 so->opt.frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME;
1580 so->frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME;
1581 so->rxfc.bs = CAN_ISOTP_DEFAULT_RECV_BS;
1582 so->rxfc.stmin = CAN_ISOTP_DEFAULT_RECV_STMIN;
1583 so->rxfc.wftmax = CAN_ISOTP_DEFAULT_RECV_WFTMAX;
1584 so->ll.mtu = CAN_ISOTP_DEFAULT_LL_MTU;
1585 so->ll.tx_dl = CAN_ISOTP_DEFAULT_LL_TX_DL;
1586 so->ll.tx_flags = CAN_ISOTP_DEFAULT_LL_TX_FLAGS;
1588 /* set ll_dl for tx path to similar place as for rx */
1589 so->tx.ll_dl = so->ll.tx_dl;
1591 so->rx.state = ISOTP_IDLE;
1592 so->tx.state = ISOTP_IDLE;
1594 hrtimer_init(&so->rxtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
1595 so->rxtimer.function = isotp_rx_timer_handler;
1596 hrtimer_init(&so->txtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
1597 so->txtimer.function = isotp_tx_timer_handler;
1598 hrtimer_init(&so->txfrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
1599 so->txfrtimer.function = isotp_txfr_timer_handler;
1601 init_waitqueue_head(&so->wait);
1602 spin_lock_init(&so->rx_lock);
1604 spin_lock(&isotp_notifier_lock);
1605 list_add_tail(&so->notifier, &isotp_notifier_list);
1606 spin_unlock(&isotp_notifier_lock);
1611 static int isotp_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
1614 /* no ioctls for socket layer -> hand it down to NIC layer */
1615 return -ENOIOCTLCMD;
1618 static const struct proto_ops isotp_ops = {
1620 .release = isotp_release,
1622 .connect = sock_no_connect,
1623 .socketpair = sock_no_socketpair,
1624 .accept = sock_no_accept,
1625 .getname = isotp_getname,
1626 .poll = datagram_poll,
1627 .ioctl = isotp_sock_no_ioctlcmd,
1628 .gettstamp = sock_gettstamp,
1629 .listen = sock_no_listen,
1630 .shutdown = sock_no_shutdown,
1631 .setsockopt = isotp_setsockopt,
1632 .getsockopt = isotp_getsockopt,
1633 .sendmsg = isotp_sendmsg,
1634 .recvmsg = isotp_recvmsg,
1635 .mmap = sock_no_mmap,
1636 .sendpage = sock_no_sendpage,
1639 static struct proto isotp_proto __read_mostly = {
1640 .name = "CAN_ISOTP",
1641 .owner = THIS_MODULE,
1642 .obj_size = sizeof(struct isotp_sock),
1646 static const struct can_proto isotp_can_proto = {
1648 .protocol = CAN_ISOTP,
1650 .prot = &isotp_proto,
1653 static struct notifier_block canisotp_notifier = {
1654 .notifier_call = isotp_notifier
1657 static __init int isotp_module_init(void)
1661 pr_info("can: isotp protocol\n");
1663 err = can_proto_register(&isotp_can_proto);
1665 pr_err("can: registration of isotp protocol failed %pe\n", ERR_PTR(err));
1667 register_netdevice_notifier(&canisotp_notifier);
1672 static __exit void isotp_module_exit(void)
1674 can_proto_unregister(&isotp_can_proto);
1675 unregister_netdevice_notifier(&canisotp_notifier);
1678 module_init(isotp_module_init);
1679 module_exit(isotp_module_exit);