^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* isotp.c - ISO 15765-2 CAN transport protocol for protocol family CAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This implementation does not provide ISO-TP specific return values to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * - RX path timeout of data reception leads to -ETIMEDOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * - RX path SN mismatch leads to -EILSEQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * - RX path data reception with wrong padding leads to -EBADMSG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * - TX path flowcontrol reception timeout leads to -ECOMM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * - TX path flowcontrol reception overflow leads to -EMSGSIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * - TX path flowcontrol reception with wrong layout/padding leads to -EBADMSG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * - when a transfer (tx) is on the run the next write() blocks until it's done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * - use CAN_ISOTP_WAIT_TX_DONE flag to block the caller until the PDU is sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * - as we have static buffers the check whether the PDU fits into the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * is done at FF reception time (no support for sending 'wait frames')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * - take care of the tx-queue-len as traffic shaping is still on the TODO list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Copyright (c) 2020 Volkswagen Group Electronic Research
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Redistribution and use in source and binary forms, with or without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * modification, are permitted provided that the following conditions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * are met:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * 1. Redistributions of source code must retain the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * notice, this list of conditions and the following disclaimer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * 2. Redistributions in binary form must reproduce the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * notice, this list of conditions and the following disclaimer in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * documentation and/or other materials provided with the distribution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * 3. Neither the name of Volkswagen nor the names of its contributors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * may be used to endorse or promote products derived from this software
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * without specific prior written permission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Alternatively, provided that this notice is retained in full, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * software may be distributed under the terms of the GNU General
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Public License ("GPL") version 2, in which case the provisions of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * GPL apply INSTEAD OF those given above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * The provided data structures and external interfaces from this code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * are not restricted to be used by modules with a GPL compatible license.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * DAMAGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #include <linux/can.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #include <linux/can/core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #include <linux/can/skb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #include <linux/can/isotp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) MODULE_DESCRIPTION("PF_CAN isotp 15765-2:2016 protocol");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) MODULE_LICENSE("Dual BSD/GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) MODULE_ALIAS("can-proto-6");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #define ISOTP_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #define SINGLE_MASK(id) (((id) & CAN_EFF_FLAG) ? \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* ISO 15765-2:2016 supports more than 4095 byte per ISO PDU as the FF_DL can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * take full 32 bit values (4 Gbyte). We would need some good concept to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * this between user space and kernel space. For now increase the static buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * to something about 8 kbyte to be able to test this new functionality.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define MAX_MSG_LENGTH 8200
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* N_PCI type values in bits 7-4 of N_PCI bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #define N_PCI_SF 0x00 /* single frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define N_PCI_FF 0x10 /* first frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #define N_PCI_CF 0x20 /* consecutive frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #define N_PCI_FC 0x30 /* flow control */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define N_PCI_SZ 1 /* size of the PCI byte #1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define SF_PCI_SZ4 1 /* size of SingleFrame PCI including 4 bit SF_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define SF_PCI_SZ8 2 /* size of SingleFrame PCI including 8 bit SF_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define FF_PCI_SZ12 2 /* size of FirstFrame PCI including 12 bit FF_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define FF_PCI_SZ32 6 /* size of FirstFrame PCI including 32 bit FF_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define FC_CONTENT_SZ 3 /* flow control content size in byte (FS/BS/STmin) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define ISOTP_CHECK_PADDING (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Flow Status given in FC frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #define ISOTP_FC_CTS 0 /* clear to send */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #define ISOTP_FC_WT 1 /* wait */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #define ISOTP_FC_OVFLW 2 /* overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ISOTP_IDLE = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ISOTP_WAIT_FIRST_FC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ISOTP_WAIT_FC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ISOTP_WAIT_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ISOTP_SENDING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct tpcon {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) u32 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) u8 bs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) u8 sn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) u8 ll_dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) u8 buf[MAX_MSG_LENGTH + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct isotp_sock {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct sock sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int bound;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) canid_t txid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) canid_t rxid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ktime_t tx_gap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ktime_t lastrxcf_tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct hrtimer rxtimer, txtimer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct can_isotp_options opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct can_isotp_fc_options rxfc, txfc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct can_isotp_ll_options ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) u32 force_tx_stmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) u32 force_rx_stmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct tpcon rx, tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct list_head notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) spinlock_t rx_lock; /* protect single thread state machine */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static LIST_HEAD(isotp_notifier_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static DEFINE_SPINLOCK(isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static struct isotp_sock *isotp_busy_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static inline struct isotp_sock *isotp_sk(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return (struct isotp_sock *)sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static enum hrtimer_restart isotp_rx_timer_handler(struct hrtimer *hrtimer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) rxtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct sock *sk = &so->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (so->rx.state == ISOTP_WAIT_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /* we did not get new data frames in time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* report 'connection timed out' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) sk->sk_err = ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* reset rx state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) struct canfd_frame *ncf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int can_send_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) nskb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), gfp_any());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (!nskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) dev = dev_get_by_index(sock_net(sk), so->ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) kfree_skb(nskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) can_skb_reserve(nskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) can_skb_prv(nskb)->ifindex = dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) can_skb_prv(nskb)->skbcnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) nskb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) can_skb_set_owner(nskb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ncf = (struct canfd_frame *)nskb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) skb_put_zero(nskb, so->ll.mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /* create & send flow control reply */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ncf->can_id = so->txid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) memset(ncf->data, so->opt.txpad_content, CAN_MAX_DLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) ncf->len = CAN_MAX_DLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ncf->len = ae + FC_CONTENT_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) ncf->data[ae] = N_PCI_FC | flowstatus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ncf->data[ae + 1] = so->rxfc.bs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) ncf->data[ae + 2] = so->rxfc.stmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ncf->data[0] = so->opt.ext_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ncf->flags = so->ll.tx_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) can_send_ret = can_send(nskb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (can_send_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) pr_notice_once("can-isotp: %s: can_send_ret %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) __func__, can_send_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* reset blocksize counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) so->rx.bs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /* reset last CF frame rx timestamp for rx stmin enforcement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) so->lastrxcf_tstamp = ktime_set(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /* start rx timeout watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) hrtimer_start(&so->rxtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static void isotp_rcv_skb(struct sk_buff *skb, struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct sockaddr_can *addr = (struct sockaddr_can *)skb->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct sockaddr_can));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) memset(addr, 0, sizeof(*addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) addr->can_family = AF_CAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) addr->can_ifindex = skb->dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (sock_queue_rcv_skb(sk, skb) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static u8 padlen(u8 datalen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static const u8 plen[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 8, 8, 8, 8, 8, 8, 8, 8, 8, /* 0 - 8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 12, 12, 12, 12, /* 9 - 12 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 16, 16, 16, 16, /* 13 - 16 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 20, 20, 20, 20, /* 17 - 20 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 24, 24, 24, 24, /* 21 - 24 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 32, 32, 32, 32, 32, 32, 32, 32, /* 25 - 32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 48, 48, 48, 48, 48, 48, 48, 48, /* 33 - 40 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 48, 48, 48, 48, 48, 48, 48, 48 /* 41 - 48 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (datalen > 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return 64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return plen[datalen];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* check for length optimization and return 1/true when the check fails */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int check_optimized(struct canfd_frame *cf, int start_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* for CAN_DL <= 8 the start_index is equal to the CAN_DL as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * padding would start at this point. E.g. if the padding would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * start at cf.data[7] cf->len has to be 7 to be optimal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * Note: The data[] index starts with zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (cf->len <= CAN_MAX_DLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return (cf->len != start_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) /* This relation is also valid in the non-linear DLC range, where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * we need to take care of the minimal next possible CAN_DL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * The correct check would be (padlen(cf->len) != padlen(start_index)).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * But as cf->len can only take discrete values from 12, .., 64 at this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * point the padlen(cf->len) is always equal to cf->len.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return (cf->len != padlen(start_index));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /* check padding and return 1/true when the check fails */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static int check_pad(struct isotp_sock *so, struct canfd_frame *cf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) int start_index, u8 content)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* no RX_PADDING value => check length of optimized frame length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (!(so->opt.flags & CAN_ISOTP_RX_PADDING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (so->opt.flags & CAN_ISOTP_CHK_PAD_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return check_optimized(cf, start_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) /* no valid test against empty value => ignore frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /* check datalength of correctly padded CAN frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if ((so->opt.flags & CAN_ISOTP_CHK_PAD_LEN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) cf->len != padlen(cf->len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /* check padding content */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (so->opt.flags & CAN_ISOTP_CHK_PAD_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) for (i = start_index; i < cf->len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (cf->data[i] != content)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static int isotp_rcv_fc(struct isotp_sock *so, struct canfd_frame *cf, int ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct sock *sk = &so->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (so->tx.state != ISOTP_WAIT_FC &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) so->tx.state != ISOTP_WAIT_FIRST_FC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) hrtimer_cancel(&so->txtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if ((cf->len < ae + FC_CONTENT_SZ) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) ((so->opt.flags & ISOTP_CHECK_PADDING) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) check_pad(so, cf, ae + FC_CONTENT_SZ, so->opt.rxpad_content))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* malformed PDU - report 'not a data message' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) sk->sk_err = EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) /* get communication parameters only from the first FC frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (so->tx.state == ISOTP_WAIT_FIRST_FC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) so->txfc.bs = cf->data[ae + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) so->txfc.stmin = cf->data[ae + 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /* fix wrong STmin values according spec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (so->txfc.stmin > 0x7F &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) (so->txfc.stmin < 0xF1 || so->txfc.stmin > 0xF9))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) so->txfc.stmin = 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) so->tx_gap = ktime_set(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* add transmission time for CAN frame N_As */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) so->tx_gap = ktime_add_ns(so->tx_gap, so->opt.frame_txtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /* add waiting time for consecutive frames N_Cs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (so->opt.flags & CAN_ISOTP_FORCE_TXSTMIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) so->tx_gap = ktime_add_ns(so->tx_gap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) so->force_tx_stmin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) else if (so->txfc.stmin < 0x80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) so->tx_gap = ktime_add_ns(so->tx_gap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) so->txfc.stmin * 1000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) so->tx_gap = ktime_add_ns(so->tx_gap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) (so->txfc.stmin - 0xF0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * 100000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) so->tx.state = ISOTP_WAIT_FC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) switch (cf->data[ae] & 0x0F) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) case ISOTP_FC_CTS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) so->tx.bs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) so->tx.state = ISOTP_SENDING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* start cyclic timer for sending CF frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) hrtimer_start(&so->txtimer, so->tx_gap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) case ISOTP_FC_WT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /* start timer to wait for next FC frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) hrtimer_start(&so->txtimer, ktime_set(1, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) case ISOTP_FC_OVFLW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) /* overflow on receiver side - report 'message too long' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) sk->sk_err = EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) /* stop this tx job */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) static int isotp_rcv_sf(struct sock *sk, struct canfd_frame *cf, int pcilen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct sk_buff *skb, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) hrtimer_cancel(&so->rxtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (!len || len > cf->len - pcilen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) check_pad(so, cf, pcilen + len, so->opt.rxpad_content)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /* malformed PDU - report 'not a data message' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) sk->sk_err = EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) nskb = alloc_skb(len, gfp_any());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (!nskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) memcpy(skb_put(nskb, len), &cf->data[pcilen], len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) nskb->tstamp = skb->tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) nskb->dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) isotp_rcv_skb(nskb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static int isotp_rcv_ff(struct sock *sk, struct canfd_frame *cf, int ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) int ff_pci_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) hrtimer_cancel(&so->rxtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /* get the used sender LL_DL from the (first) CAN frame data length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) so->rx.ll_dl = padlen(cf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /* the first frame has to use the entire frame up to LL_DL length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (cf->len != so->rx.ll_dl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) /* get the FF_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) so->rx.len = (cf->data[ae] & 0x0F) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) so->rx.len += cf->data[ae + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /* Check for FF_DL escape sequence supporting 32 bit PDU length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (so->rx.len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ff_pci_sz = FF_PCI_SZ12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /* FF_DL = 0 => get real length from next 4 bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) so->rx.len = cf->data[ae + 2] << 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) so->rx.len += cf->data[ae + 3] << 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) so->rx.len += cf->data[ae + 4] << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) so->rx.len += cf->data[ae + 5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) ff_pci_sz = FF_PCI_SZ32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) /* take care of a potential SF_DL ESC offset for TX_DL > 8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) off = (so->rx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (so->rx.len + ae + off + ff_pci_sz < so->rx.ll_dl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (so->rx.len > MAX_MSG_LENGTH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* send FC frame with overflow status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) isotp_send_fc(sk, ae, ISOTP_FC_OVFLW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) /* copy the first received data bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) so->rx.idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) for (i = ae + ff_pci_sz; i < so->rx.ll_dl; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) so->rx.buf[so->rx.idx++] = cf->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /* initial setup for this pdu reception */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) so->rx.sn = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) so->rx.state = ISOTP_WAIT_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /* no creation of flow control frames */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /* send our first FC frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) isotp_send_fc(sk, ae, ISOTP_FC_CTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) static int isotp_rcv_cf(struct sock *sk, struct canfd_frame *cf, int ae,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) struct sk_buff *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (so->rx.state != ISOTP_WAIT_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) /* drop if timestamp gap is less than force_rx_stmin nano secs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (so->opt.flags & CAN_ISOTP_FORCE_RXSTMIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (ktime_to_ns(ktime_sub(skb->tstamp, so->lastrxcf_tstamp)) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) so->force_rx_stmin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) so->lastrxcf_tstamp = skb->tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) hrtimer_cancel(&so->rxtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) /* CFs are never longer than the FF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (cf->len > so->rx.ll_dl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /* CFs have usually the LL_DL length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (cf->len < so->rx.ll_dl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) /* this is only allowed for the last CF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (so->rx.len - so->rx.idx > so->rx.ll_dl - ae - N_PCI_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if ((cf->data[ae] & 0x0F) != so->rx.sn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /* wrong sn detected - report 'illegal byte sequence' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) sk->sk_err = EILSEQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) /* reset rx state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) so->rx.sn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) so->rx.sn %= 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) for (i = ae + N_PCI_SZ; i < cf->len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) so->rx.buf[so->rx.idx++] = cf->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (so->rx.idx >= so->rx.len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (so->rx.idx >= so->rx.len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) /* we are done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if ((so->opt.flags & ISOTP_CHECK_PADDING) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) check_pad(so, cf, i + 1, so->opt.rxpad_content)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /* malformed PDU - report 'not a data message' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) sk->sk_err = EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) nskb = alloc_skb(so->rx.len, gfp_any());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (!nskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) memcpy(skb_put(nskb, so->rx.len), so->rx.buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) so->rx.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) nskb->tstamp = skb->tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) nskb->dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) isotp_rcv_skb(nskb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) /* perform blocksize handling, if enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (!so->rxfc.bs || ++so->rx.bs < so->rxfc.bs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /* start rx timeout watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) hrtimer_start(&so->rxtimer, ktime_set(1, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) /* no creation of flow control frames */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) if (so->opt.flags & CAN_ISOTP_LISTEN_MODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /* we reached the specified blocksize so->rxfc.bs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) isotp_send_fc(sk, ae, ISOTP_FC_CTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) static void isotp_rcv(struct sk_buff *skb, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct sock *sk = (struct sock *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct canfd_frame *cf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) u8 n_pci_type, sf_dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) /* Strictly receive only frames with the configured MTU size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * => clear separation of CAN2.0 / CAN FD transport channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (skb->len != so->ll.mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) cf = (struct canfd_frame *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) /* if enabled: check reception of my configured extended address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (ae && cf->data[0] != so->opt.rx_ext_address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) n_pci_type = cf->data[ae] & 0xF0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) /* Make sure the state changes and data structures stay consistent at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * CAN frame reception time. This locking is not needed in real world
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * use cases but the inconsistency can be triggered with syzkaller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) spin_lock(&so->rx_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) if (so->opt.flags & CAN_ISOTP_HALF_DUPLEX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) /* check rx/tx path half duplex expectations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if ((so->tx.state != ISOTP_IDLE && n_pci_type != N_PCI_FC) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) (so->rx.state != ISOTP_IDLE && n_pci_type == N_PCI_FC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) switch (n_pci_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) case N_PCI_FC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) /* tx path: flow control frame containing the FC parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) isotp_rcv_fc(so, cf, ae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) case N_PCI_SF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) /* rx path: single frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) * As we do not have a rx.ll_dl configuration, we can only test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) * if the CAN frames payload length matches the LL_DL == 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) * requirements - no matter if it's CAN 2.0 or CAN FD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /* get the SF_DL from the N_PCI byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) sf_dl = cf->data[ae] & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (cf->len <= CAN_MAX_DLEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) isotp_rcv_sf(sk, cf, SF_PCI_SZ4 + ae, skb, sf_dl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (skb->len == CANFD_MTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) /* We have a CAN FD frame and CAN_DL is greater than 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) * Only frames with the SF_DL == 0 ESC value are valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) * If so take care of the increased SF PCI size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) * (SF_PCI_SZ8) to point to the message content behind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) * the extended SF PCI info and get the real SF_DL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) * length value from the formerly first data byte.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (sf_dl == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) isotp_rcv_sf(sk, cf, SF_PCI_SZ8 + ae, skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) cf->data[SF_PCI_SZ4 + ae]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) case N_PCI_FF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) /* rx path: first frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) isotp_rcv_ff(sk, cf, ae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) case N_PCI_CF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) /* rx path: consecutive frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) isotp_rcv_cf(sk, cf, ae, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) spin_unlock(&so->rx_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) static void isotp_fill_dataframe(struct canfd_frame *cf, struct isotp_sock *so,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) int ae, int off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) int pcilen = N_PCI_SZ + ae + off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) int space = so->tx.ll_dl - pcilen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) int num = min_t(int, so->tx.len - so->tx.idx, space);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) cf->can_id = so->txid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) cf->len = num + pcilen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (num < space) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (so->opt.flags & CAN_ISOTP_TX_PADDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) /* user requested padding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) cf->len = padlen(cf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) memset(cf->data, so->opt.txpad_content, cf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) } else if (cf->len > CAN_MAX_DLEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) /* mandatory padding for CAN FD frames */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) cf->len = padlen(cf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) memset(cf->data, CAN_ISOTP_DEFAULT_PAD_CONTENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) cf->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) for (i = 0; i < num; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) cf->data[pcilen + i] = so->tx.buf[so->tx.idx++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) cf->data[0] = so->opt.ext_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) static void isotp_create_fframe(struct canfd_frame *cf, struct isotp_sock *so,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) int ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) int ff_pci_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) cf->can_id = so->txid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) cf->len = so->tx.ll_dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) cf->data[0] = so->opt.ext_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) /* create N_PCI bytes with 12/32 bit FF_DL data length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) if (so->tx.len > 4095) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) /* use 32 bit FF_DL notation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) cf->data[ae] = N_PCI_FF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) cf->data[ae + 1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) cf->data[ae + 2] = (u8)(so->tx.len >> 24) & 0xFFU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) cf->data[ae + 3] = (u8)(so->tx.len >> 16) & 0xFFU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) cf->data[ae + 4] = (u8)(so->tx.len >> 8) & 0xFFU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) cf->data[ae + 5] = (u8)so->tx.len & 0xFFU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) ff_pci_sz = FF_PCI_SZ32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) /* use 12 bit FF_DL notation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) cf->data[ae] = (u8)(so->tx.len >> 8) | N_PCI_FF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) cf->data[ae + 1] = (u8)so->tx.len & 0xFFU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) ff_pci_sz = FF_PCI_SZ12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /* add first data bytes depending on ae */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) for (i = ae + ff_pci_sz; i < so->tx.ll_dl; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) cf->data[i] = so->tx.buf[so->tx.idx++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) so->tx.sn = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) so->tx.state = ISOTP_WAIT_FIRST_FC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) struct isotp_sock *so = container_of(hrtimer, struct isotp_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) txtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) struct sock *sk = &so->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) struct canfd_frame *cf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) enum hrtimer_restart restart = HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) int can_send_ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) switch (so->tx.state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) case ISOTP_WAIT_FC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) case ISOTP_WAIT_FIRST_FC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) /* we did not get any flow control frame in time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) /* report 'communication error on send' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) sk->sk_err = ECOMM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) /* reset tx state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) case ISOTP_SENDING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /* push out the next segmented pdu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) dev = dev_get_by_index(sock_net(sk), so->ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) isotp_tx_burst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) can_skb_reserve(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) can_skb_prv(skb)->ifindex = dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) can_skb_prv(skb)->skbcnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) cf = (struct canfd_frame *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) skb_put_zero(skb, so->ll.mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) /* create consecutive frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) isotp_fill_dataframe(cf, so, ae, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) /* place consecutive frame N_PCI in appropriate index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) cf->data[ae] = N_PCI_CF | so->tx.sn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) so->tx.sn %= 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) so->tx.bs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) cf->flags = so->ll.tx_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) can_skb_set_owner(skb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) can_send_ret = can_send(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (can_send_ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) pr_notice_once("can-isotp: %s: can_send_ret %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) __func__, can_send_ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) if (so->tx.idx >= so->tx.len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) /* we are done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) if (so->txfc.bs && so->tx.bs >= so->txfc.bs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) /* stop and wait for FC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) so->tx.state = ISOTP_WAIT_FC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) hrtimer_set_expires(&so->txtimer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) ktime_add(ktime_get(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) ktime_set(1, 0)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) restart = HRTIMER_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) /* no gap between data frames needed => use burst mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (!so->tx_gap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) goto isotp_tx_burst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) /* start timer to send next data frame with correct delay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) hrtimer_set_expires(&so->txtimer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) ktime_add(ktime_get(), so->tx_gap));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) restart = HRTIMER_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) return restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) u32 old_state = so->tx.state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) struct canfd_frame *cf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) int wait_tx_done = (so->opt.flags & CAN_ISOTP_WAIT_TX_DONE) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) int off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) if (!so->bound)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) /* we do not support multiple buffers - for now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (cmpxchg(&so->tx.state, ISOTP_IDLE, ISOTP_SENDING) != ISOTP_IDLE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) wq_has_sleeper(&so->wait)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) if (msg->msg_flags & MSG_DONTWAIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) err = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) /* wait for complete transmission of current pdu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) err = wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (!size || size > MAX_MSG_LENGTH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) /* take care of a potential SF_DL ESC offset for TX_DL > 8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) /* does the given data fit into a single frame for SF_BROADCAST? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) if ((so->opt.flags & CAN_ISOTP_SF_BROADCAST) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) (size > so->tx.ll_dl - SF_PCI_SZ4 - ae - off)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) err = memcpy_from_msg(so->tx.buf, msg, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) dev = dev_get_by_index(sock_net(sk), so->ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) err = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) skb = sock_alloc_send_skb(sk, so->ll.mtu + sizeof(struct can_skb_priv),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) msg->msg_flags & MSG_DONTWAIT, &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) can_skb_reserve(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) can_skb_prv(skb)->ifindex = dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) can_skb_prv(skb)->skbcnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) so->tx.len = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) so->tx.idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) cf = (struct canfd_frame *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) skb_put_zero(skb, so->ll.mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) /* check for single frame transmission depending on TX_DL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) if (size <= so->tx.ll_dl - SF_PCI_SZ4 - ae - off) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) /* The message size generally fits into a SingleFrame - good.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) * SF_DL ESC offset optimization:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) * When TX_DL is greater 8 but the message would still fit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) * into a 8 byte CAN frame, we can omit the offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) * This prevents a protocol caused length extension from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) * CAN_DL = 8 to CAN_DL = 12 due to the SF_SL ESC handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (size <= CAN_MAX_DLEN - SF_PCI_SZ4 - ae)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) isotp_fill_dataframe(cf, so, ae, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) /* place single frame N_PCI w/o length in appropriate index */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) cf->data[ae] = N_PCI_SF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) /* place SF_DL size value depending on the SF_DL ESC offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) cf->data[SF_PCI_SZ4 + ae] = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) cf->data[ae] |= size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) /* don't enable wait queue for a single frame transmission */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) wait_tx_done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) /* send first frame and wait for FC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) isotp_create_fframe(cf, so, ae);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) /* start timeout for FC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) hrtimer_start(&so->txtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) /* send the first or only CAN frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) cf->flags = so->ll.tx_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) skb->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) err = can_send(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) pr_notice_once("can-isotp: %s: can_send_ret %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) __func__, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) goto err_out_drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (wait_tx_done) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) /* wait for complete transmission of current pdu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) if (sk->sk_err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) return -sk->sk_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) err_out_drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) /* drop this PDU and unlock a potential wait queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) old_state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) so->tx.state = old_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) if (so->tx.state == ISOTP_IDLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) wake_up_interruptible(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) int noblock = flags & MSG_DONTWAIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) if (!so->bound)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) return -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) flags &= ~MSG_DONTWAIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) skb = skb_recv_datagram(sk, flags, noblock, &ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) if (size < skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) msg->msg_flags |= MSG_TRUNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) size = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) ret = memcpy_to_msg(msg, skb->data, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) sock_recv_timestamp(msg, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (msg->msg_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) __sockaddr_check_size(ISOTP_MIN_NAMELEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) msg->msg_namelen = ISOTP_MIN_NAMELEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) /* set length of return value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) ret = (flags & MSG_TRUNC) ? skb->len : size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) skb_free_datagram(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) static int isotp_release(struct socket *sock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) struct isotp_sock *so;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) if (!sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) /* wait for complete transmission of current pdu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) wait_event_interruptible(so->wait, so->tx.state == ISOTP_IDLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) spin_lock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) while (isotp_busy_notifier == so) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) spin_unlock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) spin_lock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) list_del(&so->notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) spin_unlock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) /* remove current filters & unregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) if (so->ifindex) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) dev = dev_get_by_index(net, so->ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) if (dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) can_rx_unregister(net, dev, so->rxid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) SINGLE_MASK(so->rxid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) isotp_rcv, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) hrtimer_cancel(&so->txtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) hrtimer_cancel(&so->rxtimer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) so->ifindex = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) so->bound = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) sock_orphan(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) sock->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) int ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) canid_t tx_id, rx_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) int notify_enetdown = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) int do_rx_reg = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) if (len < ISOTP_MIN_NAMELEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) /* sanitize tx/rx CAN identifiers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) tx_id = addr->can_addr.tp.tx_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) if (tx_id & CAN_EFF_FLAG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) tx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) tx_id &= CAN_SFF_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) rx_id = addr->can_addr.tp.rx_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (rx_id & CAN_EFF_FLAG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) rx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) rx_id &= CAN_SFF_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (!addr->can_ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) /* do not register frame reception for functional addressing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) if (so->opt.flags & CAN_ISOTP_SF_BROADCAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) do_rx_reg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) /* do not validate rx address for functional addressing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (do_rx_reg && rx_id == tx_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) err = -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (so->bound && addr->can_ifindex == so->ifindex &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) rx_id == so->rxid && tx_id == so->txid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) dev = dev_get_by_index(net, addr->can_ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) if (!dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) if (dev->type != ARPHRD_CAN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) if (dev->mtu < so->ll.mtu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) if (!(dev->flags & IFF_UP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) notify_enetdown = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) ifindex = dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) if (do_rx_reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) can_rx_register(net, dev, rx_id, SINGLE_MASK(rx_id),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) isotp_rcv, sk, "isotp", sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) if (so->bound && do_rx_reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) /* unregister old filter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) if (so->ifindex) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) dev = dev_get_by_index(net, so->ifindex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) if (dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) can_rx_unregister(net, dev, so->rxid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) SINGLE_MASK(so->rxid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) isotp_rcv, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) /* switch to new settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) so->ifindex = ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) so->rxid = rx_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) so->txid = tx_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) so->bound = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) if (notify_enetdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) sk->sk_err = ENETDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) static int isotp_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) if (peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) memset(addr, 0, ISOTP_MIN_NAMELEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) addr->can_family = AF_CAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) addr->can_ifindex = so->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) addr->can_addr.tp.rx_id = so->rxid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) addr->can_addr.tp.tx_id = so->txid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) return ISOTP_MIN_NAMELEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) static int isotp_setsockopt_locked(struct socket *sock, int level, int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) sockptr_t optval, unsigned int optlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) if (so->bound)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) return -EISCONN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) switch (optname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) case CAN_ISOTP_OPTS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) if (optlen != sizeof(struct can_isotp_options))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) if (copy_from_sockptr(&so->opt, optval, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) /* no separate rx_ext_address is given => use ext_address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) if (!(so->opt.flags & CAN_ISOTP_RX_EXT_ADDR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) so->opt.rx_ext_address = so->opt.ext_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) case CAN_ISOTP_RECV_FC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) if (optlen != sizeof(struct can_isotp_fc_options))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) if (copy_from_sockptr(&so->rxfc, optval, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) case CAN_ISOTP_TX_STMIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) if (optlen != sizeof(u32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) if (copy_from_sockptr(&so->force_tx_stmin, optval, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) case CAN_ISOTP_RX_STMIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) if (optlen != sizeof(u32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) if (copy_from_sockptr(&so->force_rx_stmin, optval, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) case CAN_ISOTP_LL_OPTS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) if (optlen == sizeof(struct can_isotp_ll_options)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) struct can_isotp_ll_options ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) if (copy_from_sockptr(&ll, optval, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) /* check for correct ISO 11898-1 DLC data length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) if (ll.tx_dl != padlen(ll.tx_dl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) if (ll.mtu != CAN_MTU && ll.mtu != CANFD_MTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) if (ll.mtu == CAN_MTU &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) (ll.tx_dl > CAN_MAX_DLEN || ll.tx_flags != 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) memcpy(&so->ll, &ll, sizeof(ll));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) /* set ll_dl for tx path to similar place as for rx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) so->tx.ll_dl = ll.tx_dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) ret = -ENOPROTOOPT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) static int isotp_setsockopt(struct socket *sock, int level, int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) sockptr_t optval, unsigned int optlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) if (level != SOL_CAN_ISOTP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) ret = isotp_setsockopt_locked(sock, level, optname, optval, optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) static int isotp_getsockopt(struct socket *sock, int level, int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) char __user *optval, int __user *optlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) struct sock *sk = sock->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) void *val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) if (level != SOL_CAN_ISOTP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) if (get_user(len, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) switch (optname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) case CAN_ISOTP_OPTS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) len = min_t(int, len, sizeof(struct can_isotp_options));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) val = &so->opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) case CAN_ISOTP_RECV_FC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) len = min_t(int, len, sizeof(struct can_isotp_fc_options));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) val = &so->rxfc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) case CAN_ISOTP_TX_STMIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) len = min_t(int, len, sizeof(u32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) val = &so->force_tx_stmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) case CAN_ISOTP_RX_STMIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) len = min_t(int, len, sizeof(u32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) val = &so->force_rx_stmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) case CAN_ISOTP_LL_OPTS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) len = min_t(int, len, sizeof(struct can_isotp_ll_options));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) val = &so->ll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) return -ENOPROTOOPT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) if (put_user(len, optlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) if (copy_to_user(optval, val, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) static void isotp_notify(struct isotp_sock *so, unsigned long msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) struct sock *sk = &so->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) if (!net_eq(dev_net(dev), sock_net(sk)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) if (so->ifindex != dev->ifindex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) switch (msg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) case NETDEV_UNREGISTER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) /* remove current filters & unregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) can_rx_unregister(dev_net(dev), dev, so->rxid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) SINGLE_MASK(so->rxid),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) isotp_rcv, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) so->ifindex = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) so->bound = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) release_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) sk->sk_err = ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) case NETDEV_DOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) sk->sk_err = ENETDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) if (!sock_flag(sk, SOCK_DEAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) static int isotp_notifier(struct notifier_block *nb, unsigned long msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) struct net_device *dev = netdev_notifier_info_to_dev(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) if (dev->type != ARPHRD_CAN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) if (unlikely(isotp_busy_notifier)) /* Check for reentrant bug. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) spin_lock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) list_for_each_entry(isotp_busy_notifier, &isotp_notifier_list, notifier) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) spin_unlock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) isotp_notify(isotp_busy_notifier, msg, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) spin_lock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) isotp_busy_notifier = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) spin_unlock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) static int isotp_init(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) struct isotp_sock *so = isotp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) so->ifindex = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) so->bound = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) so->opt.flags = CAN_ISOTP_DEFAULT_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) so->opt.ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) so->opt.rx_ext_address = CAN_ISOTP_DEFAULT_EXT_ADDRESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) so->opt.rxpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) so->opt.txpad_content = CAN_ISOTP_DEFAULT_PAD_CONTENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) so->opt.frame_txtime = CAN_ISOTP_DEFAULT_FRAME_TXTIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) so->rxfc.bs = CAN_ISOTP_DEFAULT_RECV_BS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) so->rxfc.stmin = CAN_ISOTP_DEFAULT_RECV_STMIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) so->rxfc.wftmax = CAN_ISOTP_DEFAULT_RECV_WFTMAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) so->ll.mtu = CAN_ISOTP_DEFAULT_LL_MTU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) so->ll.tx_dl = CAN_ISOTP_DEFAULT_LL_TX_DL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) so->ll.tx_flags = CAN_ISOTP_DEFAULT_LL_TX_FLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) /* set ll_dl for tx path to similar place as for rx */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) so->tx.ll_dl = so->ll.tx_dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) so->rx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) so->tx.state = ISOTP_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) hrtimer_init(&so->rxtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) so->rxtimer.function = isotp_rx_timer_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) hrtimer_init(&so->txtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) so->txtimer.function = isotp_tx_timer_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) init_waitqueue_head(&so->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) spin_lock_init(&so->rx_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) spin_lock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) list_add_tail(&so->notifier, &isotp_notifier_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) spin_unlock(&isotp_notifier_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) static int isotp_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) /* no ioctls for socket layer -> hand it down to NIC layer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) static const struct proto_ops isotp_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) .family = PF_CAN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) .release = isotp_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) .bind = isotp_bind,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) .connect = sock_no_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) .socketpair = sock_no_socketpair,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) .accept = sock_no_accept,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) .getname = isotp_getname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) .poll = datagram_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) .ioctl = isotp_sock_no_ioctlcmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) .gettstamp = sock_gettstamp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) .listen = sock_no_listen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) .shutdown = sock_no_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) .setsockopt = isotp_setsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) .getsockopt = isotp_getsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) .sendmsg = isotp_sendmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) .recvmsg = isotp_recvmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) .mmap = sock_no_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) .sendpage = sock_no_sendpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) static struct proto isotp_proto __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) .name = "CAN_ISOTP",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) .obj_size = sizeof(struct isotp_sock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) .init = isotp_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) static const struct can_proto isotp_can_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) .type = SOCK_DGRAM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) .protocol = CAN_ISOTP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) .ops = &isotp_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) .prot = &isotp_proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) static struct notifier_block canisotp_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) .notifier_call = isotp_notifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) static __init int isotp_module_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) pr_info("can: isotp protocol\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) err = can_proto_register(&isotp_can_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) pr_err("can: registration of isotp protocol failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) register_netdevice_notifier(&canisotp_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) static __exit void isotp_module_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) can_proto_unregister(&isotp_can_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) unregister_netdevice_notifier(&canisotp_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) module_init(isotp_module_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) module_exit(isotp_module_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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