1738 lines
44 KiB
C
1738 lines
44 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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/* isotp.c - ISO 15765-2 CAN transport protocol for protocol family CAN
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*
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* This implementation does not provide ISO-TP specific return values to the
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* userspace.
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*
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* - RX path timeout of data reception leads to -ETIMEDOUT
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* - RX path SN mismatch leads to -EILSEQ
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* - RX path data reception with wrong padding leads to -EBADMSG
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* - TX path flowcontrol reception timeout leads to -ECOMM
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* - TX path flowcontrol reception overflow leads to -EMSGSIZE
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* - TX path flowcontrol reception with wrong layout/padding leads to -EBADMSG
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* - when a transfer (tx) is on the run the next write() blocks until it's done
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* - use CAN_ISOTP_WAIT_TX_DONE flag to block the caller until the PDU is sent
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* - as we have static buffers the check whether the PDU fits into the buffer
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* is done at FF reception time (no support for sending 'wait frames')
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*
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* Copyright (c) 2020 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Volkswagen nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* Alternatively, provided that this notice is retained in full, this
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* software may be distributed under the terms of the GNU General
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* Public License ("GPL") version 2, in which case the provisions of the
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* GPL apply INSTEAD OF those given above.
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*
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* The provided data structures and external interfaces from this code
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* are not restricted to be used by modules with a GPL compatible license.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/hrtimer.h>
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#include <linux/wait.h>
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#include <linux/uio.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/socket.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/can.h>
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#include <linux/can/core.h>
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#include <linux/can/skb.h>
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#include <linux/can/isotp.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/net_namespace.h>
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MODULE_DESCRIPTION("PF_CAN isotp 15765-2:2016 protocol");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
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MODULE_ALIAS("can-proto-6");
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#define ISOTP_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp)
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#define SINGLE_MASK(id) (((id) & CAN_EFF_FLAG) ? \
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(CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
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(CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
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/* ISO 15765-2:2016 supports more than 4095 byte per ISO PDU as the FF_DL can
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* take full 32 bit values (4 Gbyte). We would need some good concept to handle
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* this between user space and kernel space. For now set the static buffer to
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* something about 8 kbyte to be able to test this new functionality.
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*/
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#define DEFAULT_MAX_PDU_SIZE 8300
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/* maximum PDU size before ISO 15765-2:2016 extension was 4095 */
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#define MAX_12BIT_PDU_SIZE 4095
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/* limit the isotp pdu size from the optional module parameter to 1MByte */
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#define MAX_PDU_SIZE (1025 * 1024U)
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static unsigned int max_pdu_size __read_mostly = DEFAULT_MAX_PDU_SIZE;
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module_param(max_pdu_size, uint, 0444);
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MODULE_PARM_DESC(max_pdu_size, "maximum isotp pdu size (default "
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__stringify(DEFAULT_MAX_PDU_SIZE) ")");
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/* N_PCI type values in bits 7-4 of N_PCI bytes */
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#define N_PCI_SF 0x00 /* single frame */
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#define N_PCI_FF 0x10 /* first frame */
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#define N_PCI_CF 0x20 /* consecutive frame */
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#define N_PCI_FC 0x30 /* flow control */
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#define N_PCI_SZ 1 /* size of the PCI byte #1 */
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#define SF_PCI_SZ4 1 /* size of SingleFrame PCI including 4 bit SF_DL */
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#define SF_PCI_SZ8 2 /* size of SingleFrame PCI including 8 bit SF_DL */
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#define FF_PCI_SZ12 2 /* size of FirstFrame PCI including 12 bit FF_DL */
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#define FF_PCI_SZ32 6 /* size of FirstFrame PCI including 32 bit FF_DL */
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#define FC_CONTENT_SZ 3 /* flow control content size in byte (FS/BS/STmin) */
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#define ISOTP_CHECK_PADDING (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA)
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#define ISOTP_ALL_BC_FLAGS (CAN_ISOTP_SF_BROADCAST | CAN_ISOTP_CF_BROADCAST)
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/* Flow Status given in FC frame */
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#define ISOTP_FC_CTS 0 /* clear to send */
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#define ISOTP_FC_WT 1 /* wait */
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#define ISOTP_FC_OVFLW 2 /* overflow */
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#define ISOTP_FC_TIMEOUT 1 /* 1 sec */
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#define ISOTP_ECHO_TIMEOUT 2 /* 2 secs */
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enum {
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ISOTP_IDLE = 0,
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ISOTP_WAIT_FIRST_FC,
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ISOTP_WAIT_FC,
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ISOTP_WAIT_DATA,
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ISOTP_SENDING,
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ISOTP_SHUTDOWN,
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};
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struct tpcon {
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u8 *buf;
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unsigned int buflen;
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unsigned int len;
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unsigned int idx;
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u32 state;
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u8 bs;
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u8 sn;
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u8 ll_dl;
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u8 sbuf[DEFAULT_MAX_PDU_SIZE];
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};
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struct isotp_sock {
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struct sock sk;
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int bound;
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int ifindex;
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canid_t txid;
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canid_t rxid;
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ktime_t tx_gap;
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ktime_t lastrxcf_tstamp;
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struct hrtimer rxtimer, txtimer, txfrtimer;
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struct can_isotp_options opt;
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struct can_isotp_fc_options rxfc, txfc;
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struct can_isotp_ll_options ll;
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u32 frame_txtime;
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u32 force_tx_stmin;
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u32 force_rx_stmin;
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u32 cfecho; /* consecutive frame echo tag */
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struct tpcon rx, tx;
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struct list_head notifier;
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wait_queue_head_t wait;
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spinlock_t rx_lock; /* protect single thread state machine */
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};
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static LIST_HEAD(isotp_notifier_list);
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static DEFINE_SPINLOCK(isotp_notifier_lock);
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static struct isotp_sock *isotp_busy_notifier;
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static inline struct isotp_sock *isotp_sk(const struct sock *sk)
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{
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return (struct isotp_sock *)sk;
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}
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static u32 isotp_bc_flags(struct isotp_sock *so)
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{
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return so->opt.flags & ISOTP_ALL_BC_FLAGS;
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}
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static bool isotp_register_rxid(struct isotp_sock *so)
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{
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/* no broadcast modes => register rx_id for FC frame reception */
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return (isotp_bc_flags(so) == 0);
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}
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static enum hrtimer_restart isotp_rx_timer_handler(struct hrtimer *hrtimer)
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{
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struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
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rxtimer);
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struct sock *sk = &so->sk;
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if (so->rx.state == ISOTP_WAIT_DATA) {
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/* we did not get new data frames in time */
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/* report 'connection timed out' */
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sk->sk_err = ETIMEDOUT;
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if (!sock_flag(sk, SOCK_DEAD))
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sk_error_report(sk);
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/* reset rx state */
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so->rx.state = ISOTP_IDLE;
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}
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return HRTIMER_NORESTART;
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}
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static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
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{
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struct net_device *dev;
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struct sk_buff *nskb;
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struct canfd_frame *ncf;
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struct isotp_sock *so = isotp_sk(sk);
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int can_send_ret;
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nskb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), gfp_any());
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if (!nskb)
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return 1;
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dev = dev_get_by_index(sock_net(sk), so->ifindex);
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if (!dev) {
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kfree_skb(nskb);
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return 1;
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}
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can_skb_reserve(nskb);
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can_skb_prv(nskb)->ifindex = dev->ifindex;
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can_skb_prv(nskb)->skbcnt = 0;
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nskb->dev = dev;
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can_skb_set_owner(nskb, sk);
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ncf = (struct canfd_frame *)nskb->data;
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skb_put_zero(nskb, so->ll.mtu);
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/* create & send flow control reply */
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ncf->can_id = so->txid;
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if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
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memset(ncf->data, so->opt.txpad_content, CAN_MAX_DLEN);
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ncf->len = CAN_MAX_DLEN;
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} else {
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ncf->len = ae + FC_CONTENT_SZ;
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}
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ncf->data[ae] = N_PCI_FC | flowstatus;
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ncf->data[ae + 1] = so->rxfc.bs;
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ncf->data[ae + 2] = so->rxfc.stmin;
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if (ae)
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ncf->data[0] = so->opt.ext_address;
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ncf->flags = so->ll.tx_flags;
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can_send_ret = can_send(nskb, 1);
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if (can_send_ret)
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pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
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__func__, ERR_PTR(can_send_ret));
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dev_put(dev);
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/* reset blocksize counter */
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so->rx.bs = 0;
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/* reset last CF frame rx timestamp for rx stmin enforcement */
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so->lastrxcf_tstamp = ktime_set(0, 0);
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/* start rx timeout watchdog */
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hrtimer_start(&so->rxtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
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HRTIMER_MODE_REL_SOFT);
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return 0;
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}
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static void isotp_rcv_skb(struct sk_buff *skb, struct sock *sk)
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{
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struct sockaddr_can *addr = (struct sockaddr_can *)skb->cb;
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BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
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memset(addr, 0, sizeof(*addr));
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addr->can_family = AF_CAN;
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addr->can_ifindex = skb->dev->ifindex;
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if (sock_queue_rcv_skb(sk, skb) < 0)
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kfree_skb(skb);
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}
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static u8 padlen(u8 datalen)
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{
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static const u8 plen[] = {
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8, 8, 8, 8, 8, 8, 8, 8, 8, /* 0 - 8 */
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12, 12, 12, 12, /* 9 - 12 */
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16, 16, 16, 16, /* 13 - 16 */
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20, 20, 20, 20, /* 17 - 20 */
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24, 24, 24, 24, /* 21 - 24 */
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32, 32, 32, 32, 32, 32, 32, 32, /* 25 - 32 */
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48, 48, 48, 48, 48, 48, 48, 48, /* 33 - 40 */
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48, 48, 48, 48, 48, 48, 48, 48 /* 41 - 48 */
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};
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if (datalen > 48)
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return 64;
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return plen[datalen];
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}
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/* check for length optimization and return 1/true when the check fails */
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static int check_optimized(struct canfd_frame *cf, int start_index)
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{
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/* for CAN_DL <= 8 the start_index is equal to the CAN_DL as the
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* padding would start at this point. E.g. if the padding would
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* start at cf.data[7] cf->len has to be 7 to be optimal.
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* Note: The data[] index starts with zero.
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*/
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if (cf->len <= CAN_MAX_DLEN)
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return (cf->len != start_index);
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/* This relation is also valid in the non-linear DLC range, where
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* we need to take care of the minimal next possible CAN_DL.
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* The correct check would be (padlen(cf->len) != padlen(start_index)).
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* But as cf->len can only take discrete values from 12, .., 64 at this
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* point the padlen(cf->len) is always equal to cf->len.
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*/
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return (cf->len != padlen(start_index));
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}
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/* check padding and return 1/true when the check fails */
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static int check_pad(struct isotp_sock *so, struct canfd_frame *cf,
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int start_index, u8 content)
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{
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int i;
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/* no RX_PADDING value => check length of optimized frame length */
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if (!(so->opt.flags & CAN_ISOTP_RX_PADDING)) {
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if (so->opt.flags & CAN_ISOTP_CHK_PAD_LEN)
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return check_optimized(cf, start_index);
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/* no valid test against empty value => ignore frame */
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return 1;
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}
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/* check datalength of correctly padded CAN frame */
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if ((so->opt.flags & CAN_ISOTP_CHK_PAD_LEN) &&
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cf->len != padlen(cf->len))
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return 1;
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/* check padding content */
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if (so->opt.flags & CAN_ISOTP_CHK_PAD_DATA) {
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for (i = start_index; i < cf->len; i++)
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if (cf->data[i] != content)
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return 1;
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}
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return 0;
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}
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static void isotp_send_cframe(struct isotp_sock *so);
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static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae)
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{
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struct sock *sk = &so->sk;
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if (so->tx.state != ISOTP_WAIT_FC &&
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so->tx.state != ISOTP_WAIT_FIRST_FC)
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return 0;
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hrtimer_cancel(&so->txtimer);
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if ((cf->len < ae + FC_CONTENT_SZ) ||
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((so->opt.flags & ISOTP_CHECK_PADDING) &&
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check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) {
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/* malformed PDU - report 'not a data message' */
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sk->sk_err = EBADMSG;
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if (!sock_flag(sk, SOCK_DEAD))
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sk_error_report(sk);
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so->tx.state = ISOTP_IDLE;
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wake_up_interruptible(&so->wait);
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return 1;
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}
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/* get communication parameters only from the first FC frame */
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if (so->tx.state == ISOTP_WAIT_FIRST_FC) {
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so->txfc.bs = cf->data[ae + 1];
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so->txfc.stmin = cf->data[ae + 2];
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/* fix wrong STmin values according spec */
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if (so->txfc.stmin > 0x7F &&
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(so->txfc.stmin < 0xF1 || so->txfc.stmin > 0xF9))
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so->txfc.stmin = 0x7F;
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so->tx_gap = ktime_set(0, 0);
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/* add transmission time for CAN frame N_As */
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so->tx_gap = ktime_add_ns(so->tx_gap, so->frame_txtime);
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/* add waiting time for consecutive frames N_Cs */
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if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN)
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so->tx_gap = ktime_add_ns(so->tx_gap,
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so->force_tx_stmin);
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else if (so->txfc.stmin < 0x80)
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so->tx_gap = ktime_add_ns(so->tx_gap,
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so->txfc.stmin * 1000000);
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else
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so->tx_gap = ktime_add_ns(so->tx_gap,
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(so->txfc.stmin - 0xF0)
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* 100000);
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so->tx.state = ISOTP_WAIT_FC;
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}
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switch (cf->data[ae] & 0x0F) {
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case ISOTP_FC_CTS:
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so->tx.bs = 0;
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so->tx.state = ISOTP_SENDING;
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/* send CF frame and enable echo timeout handling */
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hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
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HRTIMER_MODE_REL_SOFT);
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isotp_send_cframe(so);
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break;
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case ISOTP_FC_WT:
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/* start timer to wait for next FC frame */
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hrtimer_start(&so->txtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
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HRTIMER_MODE_REL_SOFT);
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break;
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case ISOTP_FC_OVFLW:
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/* overflow on receiver side - report 'message too long' */
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sk->sk_err = EMSGSIZE;
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if (!sock_flag(sk, SOCK_DEAD))
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sk_error_report(sk);
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fallthrough;
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default:
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/* stop this tx job */
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so->tx.state = ISOTP_IDLE;
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wake_up_interruptible(&so->wait);
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}
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return 0;
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}
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static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen,
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struct sk_buff *skb, int len)
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{
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struct isotp_sock *so = isotp_sk(sk);
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struct sk_buff *nskb;
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hrtimer_cancel(&so->rxtimer);
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so->rx.state = ISOTP_IDLE;
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if (!len || len > cf->len - pcilen)
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return 1;
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if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
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check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) {
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/* malformed PDU - report 'not a data message' */
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sk->sk_err = EBADMSG;
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if (!sock_flag(sk, SOCK_DEAD))
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sk_error_report(sk);
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return 1;
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}
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nskb = alloc_skb(len, gfp_any());
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if (!nskb)
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return 1;
|
|
|
|
memcpy(skb_put(nskb, len), &cf->data[pcilen], len);
|
|
|
|
nskb->tstamp = skb->tstamp;
|
|
nskb->dev = skb->dev;
|
|
isotp_rcv_skb(nskb, sk);
|
|
return 0;
|
|
}
|
|
|
|
static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae)
|
|
{
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
int i;
|
|
int off;
|
|
int ff_pci_sz;
|
|
|
|
hrtimer_cancel(&so->rxtimer);
|
|
so->rx.state = ISOTP_IDLE;
|
|
|
|
/* get the used sender LL_DL from the (first) CAN frame data length */
|
|
so->rx.ll_dl = padlen(cf->len);
|
|
|
|
/* the first frame has to use the entire frame up to LL_DL length */
|
|
if (cf->len != so->rx.ll_dl)
|
|
return 1;
|
|
|
|
/* get the FF_DL */
|
|
so->rx.len = (cf->data[ae] & 0x0F) << 8;
|
|
so->rx.len += cf->data[ae + 1];
|
|
|
|
/* Check for FF_DL escape sequence supporting 32 bit PDU length */
|
|
if (so->rx.len) {
|
|
ff_pci_sz = FF_PCI_SZ12;
|
|
} else {
|
|
/* FF_DL = 0 => get real length from next 4 bytes */
|
|
so->rx.len = cf->data[ae + 2] << 24;
|
|
so->rx.len += cf->data[ae + 3] << 16;
|
|
so->rx.len += cf->data[ae + 4] << 8;
|
|
so->rx.len += cf->data[ae + 5];
|
|
ff_pci_sz = FF_PCI_SZ32;
|
|
}
|
|
|
|
/* take care of a potential SF_DL ESC offset for TX_DL > 8 */
|
|
off = (so->rx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
|
|
|
|
if (so->rx.len + ae + off + ff_pci_sz < so->rx.ll_dl)
|
|
return 1;
|
|
|
|
/* PDU size > default => try max_pdu_size */
|
|
if (so->rx.len > so->rx.buflen && so->rx.buflen < max_pdu_size) {
|
|
u8 *newbuf = kmalloc(max_pdu_size, GFP_ATOMIC);
|
|
|
|
if (newbuf) {
|
|
so->rx.buf = newbuf;
|
|
so->rx.buflen = max_pdu_size;
|
|
}
|
|
}
|
|
|
|
if (so->rx.len > so->rx.buflen) {
|
|
/* send FC frame with overflow status */
|
|
isotp_send_fc(sk, ae, ISOTP_FC_OVFLW);
|
|
return 1;
|
|
}
|
|
|
|
/* copy the first received data bytes */
|
|
so->rx.idx = 0;
|
|
for (i = ae + ff_pci_sz; i < so->rx.ll_dl; i++)
|
|
so->rx.buf[so->rx.idx++] = cf->data[i];
|
|
|
|
/* initial setup for this pdu reception */
|
|
so->rx.sn = 1;
|
|
so->rx.state = ISOTP_WAIT_DATA;
|
|
|
|
/* no creation of flow control frames */
|
|
if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
|
|
return 0;
|
|
|
|
/* send our first FC frame */
|
|
isotp_send_fc(sk, ae, ISOTP_FC_CTS);
|
|
return 0;
|
|
}
|
|
|
|
static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
struct sk_buff *nskb;
|
|
int i;
|
|
|
|
if (so->rx.state != ISOTP_WAIT_DATA)
|
|
return 0;
|
|
|
|
/* drop if timestamp gap is less than force_rx_stmin nano secs */
|
|
if (so->opt.flags & CAN_ISOTP_FORCE_RXSTMIN) {
|
|
if (ktime_to_ns(ktime_sub(skb->tstamp, so->lastrxcf_tstamp)) <
|
|
so->force_rx_stmin)
|
|
return 0;
|
|
|
|
so->lastrxcf_tstamp = skb->tstamp;
|
|
}
|
|
|
|
hrtimer_cancel(&so->rxtimer);
|
|
|
|
/* CFs are never longer than the FF */
|
|
if (cf->len > so->rx.ll_dl)
|
|
return 1;
|
|
|
|
/* CFs have usually the LL_DL length */
|
|
if (cf->len < so->rx.ll_dl) {
|
|
/* this is only allowed for the last CF */
|
|
if (so->rx.len - so->rx.idx > so->rx.ll_dl - ae - N_PCI_SZ)
|
|
return 1;
|
|
}
|
|
|
|
if ((cf->data[ae] & 0x0F) != so->rx.sn) {
|
|
/* wrong sn detected - report 'illegal byte sequence' */
|
|
sk->sk_err = EILSEQ;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
|
|
/* reset rx state */
|
|
so->rx.state = ISOTP_IDLE;
|
|
return 1;
|
|
}
|
|
so->rx.sn++;
|
|
so->rx.sn %= 16;
|
|
|
|
for (i = ae + N_PCI_SZ; i < cf->len; i++) {
|
|
so->rx.buf[so->rx.idx++] = cf->data[i];
|
|
if (so->rx.idx >= so->rx.len)
|
|
break;
|
|
}
|
|
|
|
if (so->rx.idx >= so->rx.len) {
|
|
/* we are done */
|
|
so->rx.state = ISOTP_IDLE;
|
|
|
|
if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
|
|
check_pad(so, cf, i + 1, so->opt.rxpad_content)) {
|
|
/* malformed PDU - report 'not a data message' */
|
|
sk->sk_err = EBADMSG;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
return 1;
|
|
}
|
|
|
|
nskb = alloc_skb(so->rx.len, gfp_any());
|
|
if (!nskb)
|
|
return 1;
|
|
|
|
memcpy(skb_put(nskb, so->rx.len), so->rx.buf,
|
|
so->rx.len);
|
|
|
|
nskb->tstamp = skb->tstamp;
|
|
nskb->dev = skb->dev;
|
|
isotp_rcv_skb(nskb, sk);
|
|
return 0;
|
|
}
|
|
|
|
/* perform blocksize handling, if enabled */
|
|
if (!so->rxfc.bs || ++so->rx.bs < so->rxfc.bs) {
|
|
/* start rx timeout watchdog */
|
|
hrtimer_start(&so->rxtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
return 0;
|
|
}
|
|
|
|
/* no creation of flow control frames */
|
|
if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
|
|
return 0;
|
|
|
|
/* we reached the specified blocksize so->rxfc.bs */
|
|
isotp_send_fc(sk, ae, ISOTP_FC_CTS);
|
|
return 0;
|
|
}
|
|
|
|
static void isotp_rcv(struct sk_buff *skb, void *data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
struct canfd_frame *cf;
|
|
int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
|
|
u8 n_pci_type, sf_dl;
|
|
|
|
/* Strictly receive only frames with the configured MTU size
|
|
* => clear separation of CAN2.0 / CAN FD transport channels
|
|
*/
|
|
if (skb->len != so->ll.mtu)
|
|
return;
|
|
|
|
cf = (struct canfd_frame *)skb->data;
|
|
|
|
/* if enabled: check reception of my configured extended address */
|
|
if (ae && cf->data[0] != so->opt.rx_ext_address)
|
|
return;
|
|
|
|
n_pci_type = cf->data[ae] & 0xF0;
|
|
|
|
/* Make sure the state changes and data structures stay consistent at
|
|
* CAN frame reception time. This locking is not needed in real world
|
|
* use cases but the inconsistency can be triggered with syzkaller.
|
|
*/
|
|
spin_lock(&so->rx_lock);
|
|
|
|
if (so->opt.flags & CAN_ISOTP_HALF_DUPLEX) {
|
|
/* check rx/tx path half duplex expectations */
|
|
if ((so->tx.state != ISOTP_IDLE && n_pci_type != N_PCI_FC) ||
|
|
(so->rx.state != ISOTP_IDLE && n_pci_type == N_PCI_FC))
|
|
goto out_unlock;
|
|
}
|
|
|
|
switch (n_pci_type) {
|
|
case N_PCI_FC:
|
|
/* tx path: flow control frame containing the FC parameters */
|
|
isotp_rcv_fc(so, cf, ae);
|
|
break;
|
|
|
|
case N_PCI_SF:
|
|
/* rx path: single frame
|
|
*
|
|
* As we do not have a rx.ll_dl configuration, we can only test
|
|
* if the CAN frames payload length matches the LL_DL == 8
|
|
* requirements - no matter if it's CAN 2.0 or CAN FD
|
|
*/
|
|
|
|
/* get the SF_DL from the N_PCI byte */
|
|
sf_dl = cf->data[ae] & 0x0F;
|
|
|
|
if (cf->len <= CAN_MAX_DLEN) {
|
|
isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl);
|
|
} else {
|
|
if (can_is_canfd_skb(skb)) {
|
|
/* We have a CAN FD frame and CAN_DL is greater than 8:
|
|
* Only frames with the SF_DL == 0 ESC value are valid.
|
|
*
|
|
* If so take care of the increased SF PCI size
|
|
* (SF_PCI_SZ8) to point to the message content behind
|
|
* the extended SF PCI info and get the real SF_DL
|
|
* length value from the formerly first data byte.
|
|
*/
|
|
if (sf_dl == 0)
|
|
isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb,
|
|
cf->data[SF_PCI_SZ4 + ae]);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case N_PCI_FF:
|
|
/* rx path: first frame */
|
|
isotp_rcv_ff(sk, cf, ae);
|
|
break;
|
|
|
|
case N_PCI_CF:
|
|
/* rx path: consecutive frame */
|
|
isotp_rcv_cf(sk, cf, ae, skb);
|
|
break;
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock(&so->rx_lock);
|
|
}
|
|
|
|
static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so,
|
|
int ae, int off)
|
|
{
|
|
int pcilen = N_PCI_SZ + ae + off;
|
|
int space = so->tx.ll_dl - pcilen;
|
|
int num = min_t(int, so->tx.len - so->tx.idx, space);
|
|
int i;
|
|
|
|
cf->can_id = so->txid;
|
|
cf->len = num + pcilen;
|
|
|
|
if (num < space) {
|
|
if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
|
|
/* user requested padding */
|
|
cf->len = padlen(cf->len);
|
|
memset(cf->data, so->opt.txpad_content, cf->len);
|
|
} else if (cf->len > CAN_MAX_DLEN) {
|
|
/* mandatory padding for CAN FD frames */
|
|
cf->len = padlen(cf->len);
|
|
memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT,
|
|
cf->len);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < num; i++)
|
|
cf->data[pcilen + i] = so->tx.buf[so->tx.idx++];
|
|
|
|
if (ae)
|
|
cf->data[0] = so->opt.ext_address;
|
|
}
|
|
|
|
static void isotp_send_cframe(struct isotp_sock *so)
|
|
{
|
|
struct sock *sk = &so->sk;
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
struct canfd_frame *cf;
|
|
int can_send_ret;
|
|
int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
|
|
|
|
dev = dev_get_by_index(sock_net(sk), so->ifindex);
|
|
if (!dev)
|
|
return;
|
|
|
|
skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), GFP_ATOMIC);
|
|
if (!skb) {
|
|
dev_put(dev);
|
|
return;
|
|
}
|
|
|
|
can_skb_reserve(skb);
|
|
can_skb_prv(skb)->ifindex = dev->ifindex;
|
|
can_skb_prv(skb)->skbcnt = 0;
|
|
|
|
cf = (struct canfd_frame *)skb->data;
|
|
skb_put_zero(skb, so->ll.mtu);
|
|
|
|
/* create consecutive frame */
|
|
isotp_fill_dataframe(cf, so, ae, 0);
|
|
|
|
/* place consecutive frame N_PCI in appropriate index */
|
|
cf->data[ae] = N_PCI_CF | so->tx.sn++;
|
|
so->tx.sn %= 16;
|
|
so->tx.bs++;
|
|
|
|
cf->flags = so->ll.tx_flags;
|
|
|
|
skb->dev = dev;
|
|
can_skb_set_owner(skb, sk);
|
|
|
|
/* cfecho should have been zero'ed by init/isotp_rcv_echo() */
|
|
if (so->cfecho)
|
|
pr_notice_once("can-isotp: cfecho is %08X != 0\n", so->cfecho);
|
|
|
|
/* set consecutive frame echo tag */
|
|
so->cfecho = *(u32 *)cf->data;
|
|
|
|
/* send frame with local echo enabled */
|
|
can_send_ret = can_send(skb, 1);
|
|
if (can_send_ret) {
|
|
pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
|
|
__func__, ERR_PTR(can_send_ret));
|
|
if (can_send_ret == -ENOBUFS)
|
|
pr_notice_once("can-isotp: tx queue is full\n");
|
|
}
|
|
dev_put(dev);
|
|
}
|
|
|
|
static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so,
|
|
int ae)
|
|
{
|
|
int i;
|
|
int ff_pci_sz;
|
|
|
|
cf->can_id = so->txid;
|
|
cf->len = so->tx.ll_dl;
|
|
if (ae)
|
|
cf->data[0] = so->opt.ext_address;
|
|
|
|
/* create N_PCI bytes with 12/32 bit FF_DL data length */
|
|
if (so->tx.len > MAX_12BIT_PDU_SIZE) {
|
|
/* use 32 bit FF_DL notation */
|
|
cf->data[ae] = N_PCI_FF;
|
|
cf->data[ae + 1] = 0;
|
|
cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU;
|
|
cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU;
|
|
cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU;
|
|
cf->data[ae + 5] = (u8)so->tx.len & 0xFFU;
|
|
ff_pci_sz = FF_PCI_SZ32;
|
|
} else {
|
|
/* use 12 bit FF_DL notation */
|
|
cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF;
|
|
cf->data[ae + 1] = (u8)so->tx.len & 0xFFU;
|
|
ff_pci_sz = FF_PCI_SZ12;
|
|
}
|
|
|
|
/* add first data bytes depending on ae */
|
|
for (i = ae + ff_pci_sz; i < so->tx.ll_dl; i++)
|
|
cf->data[i] = so->tx.buf[so->tx.idx++];
|
|
|
|
so->tx.sn = 1;
|
|
}
|
|
|
|
static void isotp_rcv_echo(struct sk_buff *skb, void *data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
|
|
|
|
/* only handle my own local echo CF/SF skb's (no FF!) */
|
|
if (skb->sk != sk || so->cfecho != *(u32 *)cf->data)
|
|
return;
|
|
|
|
/* cancel local echo timeout */
|
|
hrtimer_cancel(&so->txtimer);
|
|
|
|
/* local echo skb with consecutive frame has been consumed */
|
|
so->cfecho = 0;
|
|
|
|
if (so->tx.idx >= so->tx.len) {
|
|
/* we are done */
|
|
so->tx.state = ISOTP_IDLE;
|
|
wake_up_interruptible(&so->wait);
|
|
return;
|
|
}
|
|
|
|
if (so->txfc.bs && so->tx.bs >= so->txfc.bs) {
|
|
/* stop and wait for FC with timeout */
|
|
so->tx.state = ISOTP_WAIT_FC;
|
|
hrtimer_start(&so->txtimer, ktime_set(ISOTP_FC_TIMEOUT, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
return;
|
|
}
|
|
|
|
/* no gap between data frames needed => use burst mode */
|
|
if (!so->tx_gap) {
|
|
/* enable echo timeout handling */
|
|
hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
isotp_send_cframe(so);
|
|
return;
|
|
}
|
|
|
|
/* start timer to send next consecutive frame with correct delay */
|
|
hrtimer_start(&so->txfrtimer, so->tx_gap, HRTIMER_MODE_REL_SOFT);
|
|
}
|
|
|
|
static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
|
|
{
|
|
struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
|
|
txtimer);
|
|
struct sock *sk = &so->sk;
|
|
|
|
/* don't handle timeouts in IDLE or SHUTDOWN state */
|
|
if (so->tx.state == ISOTP_IDLE || so->tx.state == ISOTP_SHUTDOWN)
|
|
return HRTIMER_NORESTART;
|
|
|
|
/* we did not get any flow control or echo frame in time */
|
|
|
|
/* report 'communication error on send' */
|
|
sk->sk_err = ECOMM;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
|
|
/* reset tx state */
|
|
so->tx.state = ISOTP_IDLE;
|
|
wake_up_interruptible(&so->wait);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static enum hrtimer_restart isotp_txfr_timer_handler(struct hrtimer *hrtimer)
|
|
{
|
|
struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
|
|
txfrtimer);
|
|
|
|
/* start echo timeout handling and cover below protocol error */
|
|
hrtimer_start(&so->txtimer, ktime_set(ISOTP_ECHO_TIMEOUT, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
|
|
/* cfecho should be consumed by isotp_rcv_echo() here */
|
|
if (so->tx.state == ISOTP_SENDING && !so->cfecho)
|
|
isotp_send_cframe(so);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
struct canfd_frame *cf;
|
|
int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
|
|
int wait_tx_done = (so->opt.flags & CAN_ISOTP_WAIT_TX_DONE) ? 1 : 0;
|
|
s64 hrtimer_sec = ISOTP_ECHO_TIMEOUT;
|
|
int off;
|
|
int err;
|
|
|
|
if (!so->bound || so->tx.state == ISOTP_SHUTDOWN)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
while (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE) {
|
|
/* we do not support multiple buffers - for now */
|
|
if (msg->msg_flags & MSG_DONTWAIT)
|
|
return -EAGAIN;
|
|
|
|
if (so->tx.state == ISOTP_SHUTDOWN)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
/* wait for complete transmission of current pdu */
|
|
err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
|
|
if (err)
|
|
goto err_event_drop;
|
|
}
|
|
|
|
/* PDU size > default => try max_pdu_size */
|
|
if (size > so->tx.buflen && so->tx.buflen < max_pdu_size) {
|
|
u8 *newbuf = kmalloc(max_pdu_size, GFP_KERNEL);
|
|
|
|
if (newbuf) {
|
|
so->tx.buf = newbuf;
|
|
so->tx.buflen = max_pdu_size;
|
|
}
|
|
}
|
|
|
|
if (!size || size > so->tx.buflen) {
|
|
err = -EINVAL;
|
|
goto err_out_drop;
|
|
}
|
|
|
|
/* take care of a potential SF_DL ESC offset for TX_DL > 8 */
|
|
off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
|
|
|
|
/* does the given data fit into a single frame for SF_BROADCAST? */
|
|
if ((isotp_bc_flags(so) == CAN_ISOTP_SF_BROADCAST) &&
|
|
(size > so->tx.ll_dl - SF_PCI_SZ4 - ae - off)) {
|
|
err = -EINVAL;
|
|
goto err_out_drop;
|
|
}
|
|
|
|
err = memcpy_from_msg(so->tx.buf, msg, size);
|
|
if (err < 0)
|
|
goto err_out_drop;
|
|
|
|
dev = dev_get_by_index(sock_net(sk), so->ifindex);
|
|
if (!dev) {
|
|
err = -ENXIO;
|
|
goto err_out_drop;
|
|
}
|
|
|
|
skb = sock_alloc_send_skb(sk, so->ll.mtu + sizeof(struct can_skb_priv),
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!skb) {
|
|
dev_put(dev);
|
|
goto err_out_drop;
|
|
}
|
|
|
|
can_skb_reserve(skb);
|
|
can_skb_prv(skb)->ifindex = dev->ifindex;
|
|
can_skb_prv(skb)->skbcnt = 0;
|
|
|
|
so->tx.len = size;
|
|
so->tx.idx = 0;
|
|
|
|
cf = (struct canfd_frame *)skb->data;
|
|
skb_put_zero(skb, so->ll.mtu);
|
|
|
|
/* cfecho should have been zero'ed by init / former isotp_rcv_echo() */
|
|
if (so->cfecho)
|
|
pr_notice_once("can-isotp: uninit cfecho %08X\n", so->cfecho);
|
|
|
|
/* check for single frame transmission depending on TX_DL */
|
|
if (size <= so->tx.ll_dl - SF_PCI_SZ4 - ae - off) {
|
|
/* The message size generally fits into a SingleFrame - good.
|
|
*
|
|
* SF_DL ESC offset optimization:
|
|
*
|
|
* When TX_DL is greater 8 but the message would still fit
|
|
* into a 8 byte CAN frame, we can omit the offset.
|
|
* This prevents a protocol caused length extension from
|
|
* CAN_DL = 8 to CAN_DL = 12 due to the SF_SL ESC handling.
|
|
*/
|
|
if (size <= CAN_MAX_DLEN - SF_PCI_SZ4 - ae)
|
|
off = 0;
|
|
|
|
isotp_fill_dataframe(cf, so, ae, off);
|
|
|
|
/* place single frame N_PCI w/o length in appropriate index */
|
|
cf->data[ae] = N_PCI_SF;
|
|
|
|
/* place SF_DL size value depending on the SF_DL ESC offset */
|
|
if (off)
|
|
cf->data[SF_PCI_SZ4 + ae] = size;
|
|
else
|
|
cf->data[ae] |= size;
|
|
|
|
/* set CF echo tag for isotp_rcv_echo() (SF-mode) */
|
|
so->cfecho = *(u32 *)cf->data;
|
|
} else {
|
|
/* send first frame */
|
|
|
|
isotp_create_fframe(cf, so, ae);
|
|
|
|
if (isotp_bc_flags(so) == CAN_ISOTP_CF_BROADCAST) {
|
|
/* set timer for FC-less operation (STmin = 0) */
|
|
if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN)
|
|
so->tx_gap = ktime_set(0, so->force_tx_stmin);
|
|
else
|
|
so->tx_gap = ktime_set(0, so->frame_txtime);
|
|
|
|
/* disable wait for FCs due to activated block size */
|
|
so->txfc.bs = 0;
|
|
|
|
/* set CF echo tag for isotp_rcv_echo() (CF-mode) */
|
|
so->cfecho = *(u32 *)cf->data;
|
|
} else {
|
|
/* standard flow control check */
|
|
so->tx.state = ISOTP_WAIT_FIRST_FC;
|
|
|
|
/* start timeout for FC */
|
|
hrtimer_sec = ISOTP_FC_TIMEOUT;
|
|
|
|
/* no CF echo tag for isotp_rcv_echo() (FF-mode) */
|
|
so->cfecho = 0;
|
|
}
|
|
}
|
|
|
|
hrtimer_start(&so->txtimer, ktime_set(hrtimer_sec, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
|
|
/* send the first or only CAN frame */
|
|
cf->flags = so->ll.tx_flags;
|
|
|
|
skb->dev = dev;
|
|
skb->sk = sk;
|
|
err = can_send(skb, 1);
|
|
dev_put(dev);
|
|
if (err) {
|
|
pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
|
|
__func__, ERR_PTR(err));
|
|
|
|
/* no transmission -> no timeout monitoring */
|
|
hrtimer_cancel(&so->txtimer);
|
|
|
|
/* reset consecutive frame echo tag */
|
|
so->cfecho = 0;
|
|
|
|
goto err_out_drop;
|
|
}
|
|
|
|
if (wait_tx_done) {
|
|
/* wait for complete transmission of current pdu */
|
|
err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
|
|
if (err)
|
|
goto err_event_drop;
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return size;
|
|
|
|
err_event_drop:
|
|
/* got signal: force tx state machine to be idle */
|
|
so->tx.state = ISOTP_IDLE;
|
|
hrtimer_cancel(&so->txfrtimer);
|
|
hrtimer_cancel(&so->txtimer);
|
|
err_out_drop:
|
|
/* drop this PDU and unlock a potential wait queue */
|
|
so->tx.state = ISOTP_IDLE;
|
|
wake_up_interruptible(&so->wait);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sk_buff *skb;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
int ret = 0;
|
|
|
|
if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK | MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
if (!so->bound)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
skb = skb_recv_datagram(sk, flags, &ret);
|
|
if (!skb)
|
|
return ret;
|
|
|
|
if (size < skb->len)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
else
|
|
size = skb->len;
|
|
|
|
ret = memcpy_to_msg(msg, skb->data, size);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
sock_recv_cmsgs(msg, sk, skb);
|
|
|
|
if (msg->msg_name) {
|
|
__sockaddr_check_size(ISOTP_MIN_NAMELEN);
|
|
msg->msg_namelen = ISOTP_MIN_NAMELEN;
|
|
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
|
|
}
|
|
|
|
/* set length of return value */
|
|
ret = (flags & MSG_TRUNC) ? skb->len : size;
|
|
|
|
out_err:
|
|
skb_free_datagram(sk, skb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int isotp_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so;
|
|
struct net *net;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
so = isotp_sk(sk);
|
|
net = sock_net(sk);
|
|
|
|
/* wait for complete transmission of current pdu */
|
|
while (wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE) == 0 &&
|
|
cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SHUTDOWN) != ISOTP_IDLE)
|
|
;
|
|
|
|
/* force state machines to be idle also when a signal occurred */
|
|
so->tx.state = ISOTP_SHUTDOWN;
|
|
so->rx.state = ISOTP_IDLE;
|
|
|
|
spin_lock(&isotp_notifier_lock);
|
|
while (isotp_busy_notifier == so) {
|
|
spin_unlock(&isotp_notifier_lock);
|
|
schedule_timeout_uninterruptible(1);
|
|
spin_lock(&isotp_notifier_lock);
|
|
}
|
|
list_del(&so->notifier);
|
|
spin_unlock(&isotp_notifier_lock);
|
|
|
|
lock_sock(sk);
|
|
|
|
/* remove current filters & unregister */
|
|
if (so->bound) {
|
|
if (so->ifindex) {
|
|
struct net_device *dev;
|
|
|
|
dev = dev_get_by_index(net, so->ifindex);
|
|
if (dev) {
|
|
if (isotp_register_rxid(so))
|
|
can_rx_unregister(net, dev, so->rxid,
|
|
SINGLE_MASK(so->rxid),
|
|
isotp_rcv, sk);
|
|
|
|
can_rx_unregister(net, dev, so->txid,
|
|
SINGLE_MASK(so->txid),
|
|
isotp_rcv_echo, sk);
|
|
dev_put(dev);
|
|
synchronize_rcu();
|
|
}
|
|
}
|
|
}
|
|
|
|
hrtimer_cancel(&so->txfrtimer);
|
|
hrtimer_cancel(&so->txtimer);
|
|
hrtimer_cancel(&so->rxtimer);
|
|
|
|
so->ifindex = 0;
|
|
so->bound = 0;
|
|
|
|
if (so->rx.buf != so->rx.sbuf)
|
|
kfree(so->rx.buf);
|
|
|
|
if (so->tx.buf != so->tx.sbuf)
|
|
kfree(so->tx.buf);
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
|
|
{
|
|
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
int ifindex;
|
|
struct net_device *dev;
|
|
canid_t tx_id = addr->can_addr.tp.tx_id;
|
|
canid_t rx_id = addr->can_addr.tp.rx_id;
|
|
int err = 0;
|
|
int notify_enetdown = 0;
|
|
|
|
if (len < ISOTP_MIN_NAMELEN)
|
|
return -EINVAL;
|
|
|
|
if (addr->can_family != AF_CAN)
|
|
return -EINVAL;
|
|
|
|
/* sanitize tx CAN identifier */
|
|
if (tx_id & CAN_EFF_FLAG)
|
|
tx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
|
|
else
|
|
tx_id &= CAN_SFF_MASK;
|
|
|
|
/* give feedback on wrong CAN-ID value */
|
|
if (tx_id != addr->can_addr.tp.tx_id)
|
|
return -EINVAL;
|
|
|
|
/* sanitize rx CAN identifier (if needed) */
|
|
if (isotp_register_rxid(so)) {
|
|
if (rx_id & CAN_EFF_FLAG)
|
|
rx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
|
|
else
|
|
rx_id &= CAN_SFF_MASK;
|
|
|
|
/* give feedback on wrong CAN-ID value */
|
|
if (rx_id != addr->can_addr.tp.rx_id)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!addr->can_ifindex)
|
|
return -ENODEV;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (so->bound) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* ensure different CAN IDs when the rx_id is to be registered */
|
|
if (isotp_register_rxid(so) && rx_id == tx_id) {
|
|
err = -EADDRNOTAVAIL;
|
|
goto out;
|
|
}
|
|
|
|
dev = dev_get_by_index(net, addr->can_ifindex);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (dev->type != ARPHRD_CAN) {
|
|
dev_put(dev);
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (dev->mtu < so->ll.mtu) {
|
|
dev_put(dev);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!(dev->flags & IFF_UP))
|
|
notify_enetdown = 1;
|
|
|
|
ifindex = dev->ifindex;
|
|
|
|
if (isotp_register_rxid(so))
|
|
can_rx_register(net, dev, rx_id, SINGLE_MASK(rx_id),
|
|
isotp_rcv, sk, "isotp", sk);
|
|
|
|
/* no consecutive frame echo skb in flight */
|
|
so->cfecho = 0;
|
|
|
|
/* register for echo skb's */
|
|
can_rx_register(net, dev, tx_id, SINGLE_MASK(tx_id),
|
|
isotp_rcv_echo, sk, "isotpe", sk);
|
|
|
|
dev_put(dev);
|
|
|
|
/* switch to new settings */
|
|
so->ifindex = ifindex;
|
|
so->rxid = rx_id;
|
|
so->txid = tx_id;
|
|
so->bound = 1;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
|
|
if (notify_enetdown) {
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
|
|
{
|
|
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
|
|
if (peer)
|
|
return -EOPNOTSUPP;
|
|
|
|
memset(addr, 0, ISOTP_MIN_NAMELEN);
|
|
addr->can_family = AF_CAN;
|
|
addr->can_ifindex = so->ifindex;
|
|
addr->can_addr.tp.rx_id = so->rxid;
|
|
addr->can_addr.tp.tx_id = so->txid;
|
|
|
|
return ISOTP_MIN_NAMELEN;
|
|
}
|
|
|
|
static int isotp_setsockopt_locked(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
int ret = 0;
|
|
|
|
if (so->bound)
|
|
return -EISCONN;
|
|
|
|
switch (optname) {
|
|
case CAN_ISOTP_OPTS:
|
|
if (optlen != sizeof(struct can_isotp_options))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&so->opt, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
/* no separate rx_ext_address is given => use ext_address */
|
|
if (!(so->opt.flags & CAN_ISOTP_RX_EXT_ADDR))
|
|
so->opt.rx_ext_address = so->opt.ext_address;
|
|
|
|
/* these broadcast flags are not allowed together */
|
|
if (isotp_bc_flags(so) == ISOTP_ALL_BC_FLAGS) {
|
|
/* CAN_ISOTP_SF_BROADCAST is prioritized */
|
|
so->opt.flags &= ~CAN_ISOTP_CF_BROADCAST;
|
|
|
|
/* give user feedback on wrong config attempt */
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* check for frame_txtime changes (0 => no changes) */
|
|
if (so->opt.frame_txtime) {
|
|
if (so->opt.frame_txtime == CAN_ISOTP_FRAME_TXTIME_ZERO)
|
|
so->frame_txtime = 0;
|
|
else
|
|
so->frame_txtime = so->opt.frame_txtime;
|
|
}
|
|
break;
|
|
|
|
case CAN_ISOTP_RECV_FC:
|
|
if (optlen != sizeof(struct can_isotp_fc_options))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&so->rxfc, optval, optlen))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case CAN_ISOTP_TX_STMIN:
|
|
if (optlen != sizeof(u32))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&so->force_tx_stmin, optval, optlen))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case CAN_ISOTP_RX_STMIN:
|
|
if (optlen != sizeof(u32))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&so->force_rx_stmin, optval, optlen))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case CAN_ISOTP_LL_OPTS:
|
|
if (optlen == sizeof(struct can_isotp_ll_options)) {
|
|
struct can_isotp_ll_options ll;
|
|
|
|
if (copy_from_sockptr(&ll, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
/* check for correct ISO 11898-1 DLC data length */
|
|
if (ll.tx_dl != padlen(ll.tx_dl))
|
|
return -EINVAL;
|
|
|
|
if (ll.mtu != CAN_MTU && ll.mtu != CANFD_MTU)
|
|
return -EINVAL;
|
|
|
|
if (ll.mtu == CAN_MTU &&
|
|
(ll.tx_dl > CAN_MAX_DLEN || ll.tx_flags != 0))
|
|
return -EINVAL;
|
|
|
|
memcpy(&so->ll, &ll, sizeof(ll));
|
|
|
|
/* set ll_dl for tx path to similar place as for rx */
|
|
so->tx.ll_dl = ll.tx_dl;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ret = -ENOPROTOOPT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int isotp_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int ret;
|
|
|
|
if (level != SOL_CAN_ISOTP)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
ret = isotp_setsockopt_locked(sock, level, optname, optval, optlen);
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
static int isotp_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
int len;
|
|
void *val;
|
|
|
|
if (level != SOL_CAN_ISOTP)
|
|
return -EINVAL;
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case CAN_ISOTP_OPTS:
|
|
len = min_t(int, len, sizeof(struct can_isotp_options));
|
|
val = &so->opt;
|
|
break;
|
|
|
|
case CAN_ISOTP_RECV_FC:
|
|
len = min_t(int, len, sizeof(struct can_isotp_fc_options));
|
|
val = &so->rxfc;
|
|
break;
|
|
|
|
case CAN_ISOTP_TX_STMIN:
|
|
len = min_t(int, len, sizeof(u32));
|
|
val = &so->force_tx_stmin;
|
|
break;
|
|
|
|
case CAN_ISOTP_RX_STMIN:
|
|
len = min_t(int, len, sizeof(u32));
|
|
val = &so->force_rx_stmin;
|
|
break;
|
|
|
|
case CAN_ISOTP_LL_OPTS:
|
|
len = min_t(int, len, sizeof(struct can_isotp_ll_options));
|
|
val = &so->ll;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, val, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static void isotp_notify(struct isotp_sock *so, unsigned long msg,
|
|
struct net_device *dev)
|
|
{
|
|
struct sock *sk = &so->sk;
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
return;
|
|
|
|
if (so->ifindex != dev->ifindex)
|
|
return;
|
|
|
|
switch (msg) {
|
|
case NETDEV_UNREGISTER:
|
|
lock_sock(sk);
|
|
/* remove current filters & unregister */
|
|
if (so->bound) {
|
|
if (isotp_register_rxid(so))
|
|
can_rx_unregister(dev_net(dev), dev, so->rxid,
|
|
SINGLE_MASK(so->rxid),
|
|
isotp_rcv, sk);
|
|
|
|
can_rx_unregister(dev_net(dev), dev, so->txid,
|
|
SINGLE_MASK(so->txid),
|
|
isotp_rcv_echo, sk);
|
|
}
|
|
|
|
so->ifindex = 0;
|
|
so->bound = 0;
|
|
release_sock(sk);
|
|
|
|
sk->sk_err = ENODEV;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
break;
|
|
|
|
case NETDEV_DOWN:
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk_error_report(sk);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
if (dev->type != ARPHRD_CAN)
|
|
return NOTIFY_DONE;
|
|
if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
|
|
return NOTIFY_DONE;
|
|
if (unlikely(isotp_busy_notifier)) /* Check for reentrant bug. */
|
|
return NOTIFY_DONE;
|
|
|
|
spin_lock(&isotp_notifier_lock);
|
|
list_for_each_entry(isotp_busy_notifier, &isotp_notifier_list, notifier) {
|
|
spin_unlock(&isotp_notifier_lock);
|
|
isotp_notify(isotp_busy_notifier, msg, dev);
|
|
spin_lock(&isotp_notifier_lock);
|
|
}
|
|
isotp_busy_notifier = NULL;
|
|
spin_unlock(&isotp_notifier_lock);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int isotp_init(struct sock *sk)
|
|
{
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
|
|
so->ifindex = 0;
|
|
so->bound = 0;
|
|
|
|
so->opt.flags = CAN_ISOTP_DEFAULT_FLAGS;
|
|
so->opt.ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
|
|
so->opt.rx_ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
|
|
so->opt.rxpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
|
|
so->opt.txpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
|
|
so->opt.frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME;
|
|
so->frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME;
|
|
so->rxfc.bs = CAN_ISOTP_DEFAULT_RECV_BS;
|
|
so->rxfc.stmin = CAN_ISOTP_DEFAULT_RECV_STMIN;
|
|
so->rxfc.wftmax = CAN_ISOTP_DEFAULT_RECV_WFTMAX;
|
|
so->ll.mtu = CAN_ISOTP_DEFAULT_LL_MTU;
|
|
so->ll.tx_dl = CAN_ISOTP_DEFAULT_LL_TX_DL;
|
|
so->ll.tx_flags = CAN_ISOTP_DEFAULT_LL_TX_FLAGS;
|
|
|
|
/* set ll_dl for tx path to similar place as for rx */
|
|
so->tx.ll_dl = so->ll.tx_dl;
|
|
|
|
so->rx.state = ISOTP_IDLE;
|
|
so->tx.state = ISOTP_IDLE;
|
|
|
|
so->rx.buf = so->rx.sbuf;
|
|
so->tx.buf = so->tx.sbuf;
|
|
so->rx.buflen = ARRAY_SIZE(so->rx.sbuf);
|
|
so->tx.buflen = ARRAY_SIZE(so->tx.sbuf);
|
|
|
|
hrtimer_init(&so->rxtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
|
|
so->rxtimer.function = isotp_rx_timer_handler;
|
|
hrtimer_init(&so->txtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
|
|
so->txtimer.function = isotp_tx_timer_handler;
|
|
hrtimer_init(&so->txfrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
|
|
so->txfrtimer.function = isotp_txfr_timer_handler;
|
|
|
|
init_waitqueue_head(&so->wait);
|
|
spin_lock_init(&so->rx_lock);
|
|
|
|
spin_lock(&isotp_notifier_lock);
|
|
list_add_tail(&so->notifier, &isotp_notifier_list);
|
|
spin_unlock(&isotp_notifier_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __poll_t isotp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct isotp_sock *so = isotp_sk(sk);
|
|
|
|
__poll_t mask = datagram_poll(file, sock, wait);
|
|
poll_wait(file, &so->wait, wait);
|
|
|
|
/* Check for false positives due to TX state */
|
|
if ((mask & EPOLLWRNORM) && (so->tx.state != ISOTP_IDLE))
|
|
mask &= ~(EPOLLOUT | EPOLLWRNORM);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int isotp_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
/* no ioctls for socket layer -> hand it down to NIC layer */
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static const struct proto_ops isotp_ops = {
|
|
.family = PF_CAN,
|
|
.release = isotp_release,
|
|
.bind = isotp_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = isotp_getname,
|
|
.poll = isotp_poll,
|
|
.ioctl = isotp_sock_no_ioctlcmd,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = isotp_setsockopt,
|
|
.getsockopt = isotp_getsockopt,
|
|
.sendmsg = isotp_sendmsg,
|
|
.recvmsg = isotp_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
};
|
|
|
|
static struct proto isotp_proto __read_mostly = {
|
|
.name = "CAN_ISOTP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct isotp_sock),
|
|
.init = isotp_init,
|
|
};
|
|
|
|
static const struct can_proto isotp_can_proto = {
|
|
.type = SOCK_DGRAM,
|
|
.protocol = CAN_ISOTP,
|
|
.ops = &isotp_ops,
|
|
.prot = &isotp_proto,
|
|
};
|
|
|
|
static struct notifier_block canisotp_notifier = {
|
|
.notifier_call = isotp_notifier
|
|
};
|
|
|
|
static __init int isotp_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
max_pdu_size = max_t(unsigned int, max_pdu_size, MAX_12BIT_PDU_SIZE);
|
|
max_pdu_size = min_t(unsigned int, max_pdu_size, MAX_PDU_SIZE);
|
|
|
|
pr_info("can: isotp protocol (max_pdu_size %d)\n", max_pdu_size);
|
|
|
|
err = can_proto_register(&isotp_can_proto);
|
|
if (err < 0)
|
|
pr_err("can: registration of isotp protocol failed %pe\n", ERR_PTR(err));
|
|
else
|
|
register_netdevice_notifier(&canisotp_notifier);
|
|
|
|
return err;
|
|
}
|
|
|
|
static __exit void isotp_module_exit(void)
|
|
{
|
|
can_proto_unregister(&isotp_can_proto);
|
|
unregister_netdevice_notifier(&canisotp_notifier);
|
|
}
|
|
|
|
module_init(isotp_module_init);
|
|
module_exit(isotp_module_exit);
|