|
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
|
|
/* raw.c - Raw sockets for protocol family CAN
|
|
*
|
|
* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of Volkswagen nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* Alternatively, provided that this notice is retained in full, this
|
|
* software may be distributed under the terms of the GNU General
|
|
* Public License ("GPL") version 2, in which case the provisions of the
|
|
* GPL apply INSTEAD OF those given above.
|
|
*
|
|
* The provided data structures and external interfaces from this code
|
|
* are not restricted to be used by modules with a GPL compatible license.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
|
|
* DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/net.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/can.h>
|
|
#include <linux/can/core.h>
|
|
#include <linux/can/skb.h>
|
|
#include <linux/can/raw.h>
|
|
#include <net/sock.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
MODULE_DESCRIPTION("PF_CAN raw protocol");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
|
|
MODULE_ALIAS("can-proto-1");
|
|
|
|
#define RAW_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex)
|
|
|
|
#define MASK_ALL 0
|
|
|
|
/* A raw socket has a list of can_filters attached to it, each receiving
|
|
* the CAN frames matching that filter. If the filter list is empty,
|
|
* no CAN frames will be received by the socket. The default after
|
|
* opening the socket, is to have one filter which receives all frames.
|
|
* The filter list is allocated dynamically with the exception of the
|
|
* list containing only one item. This common case is optimized by
|
|
* storing the single filter in dfilter, to avoid using dynamic memory.
|
|
*/
|
|
|
|
struct uniqframe {
|
|
int skbcnt;
|
|
const struct sk_buff *skb;
|
|
unsigned int join_rx_count;
|
|
};
|
|
|
|
struct raw_sock {
|
|
struct sock sk;
|
|
int bound;
|
|
int ifindex;
|
|
struct list_head notifier;
|
|
int loopback;
|
|
int recv_own_msgs;
|
|
int fd_frames;
|
|
int join_filters;
|
|
int count; /* number of active filters */
|
|
struct can_filter dfilter; /* default/single filter */
|
|
struct can_filter *filter; /* pointer to filter(s) */
|
|
can_err_mask_t err_mask;
|
|
struct uniqframe __percpu *uniq;
|
|
};
|
|
|
|
static LIST_HEAD(raw_notifier_list);
|
|
static DEFINE_SPINLOCK(raw_notifier_lock);
|
|
static struct raw_sock *raw_busy_notifier;
|
|
|
|
/* Return pointer to store the extra msg flags for raw_recvmsg().
|
|
* We use the space of one unsigned int beyond the 'struct sockaddr_can'
|
|
* in skb->cb.
|
|
*/
|
|
static inline unsigned int *raw_flags(struct sk_buff *skb)
|
|
{
|
|
sock_skb_cb_check_size(sizeof(struct sockaddr_can) +
|
|
sizeof(unsigned int));
|
|
|
|
/* return pointer after struct sockaddr_can */
|
|
return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
|
|
}
|
|
|
|
static inline struct raw_sock *raw_sk(const struct sock *sk)
|
|
{
|
|
return (struct raw_sock *)sk;
|
|
}
|
|
|
|
static void raw_rcv(struct sk_buff *oskb, void *data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
struct sockaddr_can *addr;
|
|
struct sk_buff *skb;
|
|
unsigned int *pflags;
|
|
|
|
/* check the received tx sock reference */
|
|
if (!ro->recv_own_msgs && oskb->sk == sk)
|
|
return;
|
|
|
|
/* do not pass non-CAN2.0 frames to a legacy socket */
|
|
if (!ro->fd_frames && oskb->len != CAN_MTU)
|
|
return;
|
|
|
|
/* eliminate multiple filter matches for the same skb */
|
|
if (this_cpu_ptr(ro->uniq)->skb == oskb &&
|
|
this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
|
|
if (ro->join_filters) {
|
|
this_cpu_inc(ro->uniq->join_rx_count);
|
|
/* drop frame until all enabled filters matched */
|
|
if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
|
|
return;
|
|
} else {
|
|
return;
|
|
}
|
|
} else {
|
|
this_cpu_ptr(ro->uniq)->skb = oskb;
|
|
this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
|
|
this_cpu_ptr(ro->uniq)->join_rx_count = 1;
|
|
/* drop first frame to check all enabled filters? */
|
|
if (ro->join_filters && ro->count > 1)
|
|
return;
|
|
}
|
|
|
|
/* clone the given skb to be able to enqueue it into the rcv queue */
|
|
skb = skb_clone(oskb, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
/* Put the datagram to the queue so that raw_recvmsg() can get
|
|
* it from there. We need to pass the interface index to
|
|
* raw_recvmsg(). We pass a whole struct sockaddr_can in
|
|
* skb->cb containing the interface index.
|
|
*/
|
|
|
|
sock_skb_cb_check_size(sizeof(struct sockaddr_can));
|
|
addr = (struct sockaddr_can *)skb->cb;
|
|
memset(addr, 0, sizeof(*addr));
|
|
addr->can_family = AF_CAN;
|
|
addr->can_ifindex = skb->dev->ifindex;
|
|
|
|
/* add CAN specific message flags for raw_recvmsg() */
|
|
pflags = raw_flags(skb);
|
|
*pflags = 0;
|
|
if (oskb->sk)
|
|
*pflags |= MSG_DONTROUTE;
|
|
if (oskb->sk == sk)
|
|
*pflags |= MSG_CONFIRM;
|
|
|
|
if (sock_queue_rcv_skb(sk, skb) < 0)
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static int raw_enable_filters(struct net *net, struct net_device *dev,
|
|
struct sock *sk, struct can_filter *filter,
|
|
int count)
|
|
{
|
|
int err = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
err = can_rx_register(net, dev, filter[i].can_id,
|
|
filter[i].can_mask,
|
|
raw_rcv, sk, "raw", sk);
|
|
if (err) {
|
|
/* clean up successfully registered filters */
|
|
while (--i >= 0)
|
|
can_rx_unregister(net, dev, filter[i].can_id,
|
|
filter[i].can_mask,
|
|
raw_rcv, sk);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int raw_enable_errfilter(struct net *net, struct net_device *dev,
|
|
struct sock *sk, can_err_mask_t err_mask)
|
|
{
|
|
int err = 0;
|
|
|
|
if (err_mask)
|
|
err = can_rx_register(net, dev, 0, err_mask | CAN_ERR_FLAG,
|
|
raw_rcv, sk, "raw", sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void raw_disable_filters(struct net *net, struct net_device *dev,
|
|
struct sock *sk, struct can_filter *filter,
|
|
int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++)
|
|
can_rx_unregister(net, dev, filter[i].can_id,
|
|
filter[i].can_mask, raw_rcv, sk);
|
|
}
|
|
|
|
static inline void raw_disable_errfilter(struct net *net,
|
|
struct net_device *dev,
|
|
struct sock *sk,
|
|
can_err_mask_t err_mask)
|
|
|
|
{
|
|
if (err_mask)
|
|
can_rx_unregister(net, dev, 0, err_mask | CAN_ERR_FLAG,
|
|
raw_rcv, sk);
|
|
}
|
|
|
|
static inline void raw_disable_allfilters(struct net *net,
|
|
struct net_device *dev,
|
|
struct sock *sk)
|
|
{
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
|
|
raw_disable_filters(net, dev, sk, ro->filter, ro->count);
|
|
raw_disable_errfilter(net, dev, sk, ro->err_mask);
|
|
}
|
|
|
|
static int raw_enable_allfilters(struct net *net, struct net_device *dev,
|
|
struct sock *sk)
|
|
{
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
int err;
|
|
|
|
err = raw_enable_filters(net, dev, sk, ro->filter, ro->count);
|
|
if (!err) {
|
|
err = raw_enable_errfilter(net, dev, sk, ro->err_mask);
|
|
if (err)
|
|
raw_disable_filters(net, dev, sk, ro->filter,
|
|
ro->count);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void raw_notify(struct raw_sock *ro, unsigned long msg,
|
|
struct net_device *dev)
|
|
{
|
|
struct sock *sk = &ro->sk;
|
|
|
|
if (!net_eq(dev_net(dev), sock_net(sk)))
|
|
return;
|
|
|
|
if (ro->ifindex != dev->ifindex)
|
|
return;
|
|
|
|
switch (msg) {
|
|
case NETDEV_UNREGISTER:
|
|
lock_sock(sk);
|
|
/* remove current filters & unregister */
|
|
if (ro->bound)
|
|
raw_disable_allfilters(dev_net(dev), dev, sk);
|
|
|
|
if (ro->count > 1)
|
|
kfree(ro->filter);
|
|
|
|
ro->ifindex = 0;
|
|
ro->bound = 0;
|
|
ro->count = 0;
|
|
release_sock(sk);
|
|
|
|
sk->sk_err = ENODEV;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
break;
|
|
|
|
case NETDEV_DOWN:
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int raw_notifier(struct notifier_block *nb, unsigned long msg,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
if (dev->type != ARPHRD_CAN)
|
|
return NOTIFY_DONE;
|
|
if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
|
|
return NOTIFY_DONE;
|
|
if (unlikely(raw_busy_notifier)) /* Check for reentrant bug. */
|
|
return NOTIFY_DONE;
|
|
|
|
spin_lock(&raw_notifier_lock);
|
|
list_for_each_entry(raw_busy_notifier, &raw_notifier_list, notifier) {
|
|
spin_unlock(&raw_notifier_lock);
|
|
raw_notify(raw_busy_notifier, msg, dev);
|
|
spin_lock(&raw_notifier_lock);
|
|
}
|
|
raw_busy_notifier = NULL;
|
|
spin_unlock(&raw_notifier_lock);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int raw_init(struct sock *sk)
|
|
{
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
|
|
ro->bound = 0;
|
|
ro->ifindex = 0;
|
|
|
|
/* set default filter to single entry dfilter */
|
|
ro->dfilter.can_id = 0;
|
|
ro->dfilter.can_mask = MASK_ALL;
|
|
ro->filter = &ro->dfilter;
|
|
ro->count = 1;
|
|
|
|
/* set default loopback behaviour */
|
|
ro->loopback = 1;
|
|
ro->recv_own_msgs = 0;
|
|
ro->fd_frames = 0;
|
|
ro->join_filters = 0;
|
|
|
|
/* alloc_percpu provides zero'ed memory */
|
|
ro->uniq = alloc_percpu(struct uniqframe);
|
|
if (unlikely(!ro->uniq))
|
|
return -ENOMEM;
|
|
|
|
/* set notifier */
|
|
spin_lock(&raw_notifier_lock);
|
|
list_add_tail(&ro->notifier, &raw_notifier_list);
|
|
spin_unlock(&raw_notifier_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int raw_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
ro = raw_sk(sk);
|
|
|
|
spin_lock(&raw_notifier_lock);
|
|
while (raw_busy_notifier == ro) {
|
|
spin_unlock(&raw_notifier_lock);
|
|
schedule_timeout_uninterruptible(1);
|
|
spin_lock(&raw_notifier_lock);
|
|
}
|
|
list_del(&ro->notifier);
|
|
spin_unlock(&raw_notifier_lock);
|
|
|
|
lock_sock(sk);
|
|
|
|
/* remove current filters & unregister */
|
|
if (ro->bound) {
|
|
if (ro->ifindex) {
|
|
struct net_device *dev;
|
|
|
|
dev = dev_get_by_index(sock_net(sk), ro->ifindex);
|
|
if (dev) {
|
|
raw_disable_allfilters(dev_net(dev), dev, sk);
|
|
dev_put(dev);
|
|
}
|
|
} else {
|
|
raw_disable_allfilters(sock_net(sk), NULL, sk);
|
|
}
|
|
}
|
|
|
|
if (ro->count > 1)
|
|
kfree(ro->filter);
|
|
|
|
ro->ifindex = 0;
|
|
ro->bound = 0;
|
|
ro->count = 0;
|
|
free_percpu(ro->uniq);
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
|
|
{
|
|
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
int ifindex;
|
|
int err = 0;
|
|
int notify_enetdown = 0;
|
|
|
|
if (len < RAW_MIN_NAMELEN)
|
|
return -EINVAL;
|
|
if (addr->can_family != AF_CAN)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (ro->bound && addr->can_ifindex == ro->ifindex)
|
|
goto out;
|
|
|
|
if (addr->can_ifindex) {
|
|
struct net_device *dev;
|
|
|
|
dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (dev->type != ARPHRD_CAN) {
|
|
dev_put(dev);
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (!(dev->flags & IFF_UP))
|
|
notify_enetdown = 1;
|
|
|
|
ifindex = dev->ifindex;
|
|
|
|
/* filters set by default/setsockopt */
|
|
err = raw_enable_allfilters(sock_net(sk), dev, sk);
|
|
dev_put(dev);
|
|
} else {
|
|
ifindex = 0;
|
|
|
|
/* filters set by default/setsockopt */
|
|
err = raw_enable_allfilters(sock_net(sk), NULL, sk);
|
|
}
|
|
|
|
if (!err) {
|
|
if (ro->bound) {
|
|
/* unregister old filters */
|
|
if (ro->ifindex) {
|
|
struct net_device *dev;
|
|
|
|
dev = dev_get_by_index(sock_net(sk),
|
|
ro->ifindex);
|
|
if (dev) {
|
|
raw_disable_allfilters(dev_net(dev),
|
|
dev, sk);
|
|
dev_put(dev);
|
|
}
|
|
} else {
|
|
raw_disable_allfilters(sock_net(sk), NULL, sk);
|
|
}
|
|
}
|
|
ro->ifindex = ifindex;
|
|
ro->bound = 1;
|
|
}
|
|
|
|
out:
|
|
release_sock(sk);
|
|
|
|
if (notify_enetdown) {
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
|
|
if (peer)
|
|
return -EOPNOTSUPP;
|
|
|
|
memset(addr, 0, RAW_MIN_NAMELEN);
|
|
addr->can_family = AF_CAN;
|
|
addr->can_ifindex = ro->ifindex;
|
|
|
|
return RAW_MIN_NAMELEN;
|
|
}
|
|
|
|
static int raw_setsockopt(struct socket *sock, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
struct can_filter *filter = NULL; /* dyn. alloc'ed filters */
|
|
struct can_filter sfilter; /* single filter */
|
|
struct net_device *dev = NULL;
|
|
can_err_mask_t err_mask = 0;
|
|
int count = 0;
|
|
int err = 0;
|
|
|
|
if (level != SOL_CAN_RAW)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case CAN_RAW_FILTER:
|
|
if (optlen % sizeof(struct can_filter) != 0)
|
|
return -EINVAL;
|
|
|
|
if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
|
|
return -EINVAL;
|
|
|
|
count = optlen / sizeof(struct can_filter);
|
|
|
|
if (count > 1) {
|
|
/* filter does not fit into dfilter => alloc space */
|
|
filter = memdup_sockptr(optval, optlen);
|
|
if (IS_ERR(filter))
|
|
return PTR_ERR(filter);
|
|
} else if (count == 1) {
|
|
if (copy_from_sockptr(&sfilter, optval, sizeof(sfilter)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
rtnl_lock();
|
|
lock_sock(sk);
|
|
|
|
if (ro->bound && ro->ifindex) {
|
|
dev = dev_get_by_index(sock_net(sk), ro->ifindex);
|
|
if (!dev) {
|
|
if (count > 1)
|
|
kfree(filter);
|
|
err = -ENODEV;
|
|
goto out_fil;
|
|
}
|
|
}
|
|
|
|
if (ro->bound) {
|
|
/* (try to) register the new filters */
|
|
if (count == 1)
|
|
err = raw_enable_filters(sock_net(sk), dev, sk,
|
|
&sfilter, 1);
|
|
else
|
|
err = raw_enable_filters(sock_net(sk), dev, sk,
|
|
filter, count);
|
|
if (err) {
|
|
if (count > 1)
|
|
kfree(filter);
|
|
goto out_fil;
|
|
}
|
|
|
|
/* remove old filter registrations */
|
|
raw_disable_filters(sock_net(sk), dev, sk, ro->filter,
|
|
ro->count);
|
|
}
|
|
|
|
/* remove old filter space */
|
|
if (ro->count > 1)
|
|
kfree(ro->filter);
|
|
|
|
/* link new filters to the socket */
|
|
if (count == 1) {
|
|
/* copy filter data for single filter */
|
|
ro->dfilter = sfilter;
|
|
filter = &ro->dfilter;
|
|
}
|
|
ro->filter = filter;
|
|
ro->count = count;
|
|
|
|
out_fil:
|
|
if (dev)
|
|
dev_put(dev);
|
|
|
|
release_sock(sk);
|
|
rtnl_unlock();
|
|
|
|
break;
|
|
|
|
case CAN_RAW_ERR_FILTER:
|
|
if (optlen != sizeof(err_mask))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&err_mask, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
err_mask &= CAN_ERR_MASK;
|
|
|
|
rtnl_lock();
|
|
lock_sock(sk);
|
|
|
|
if (ro->bound && ro->ifindex) {
|
|
dev = dev_get_by_index(sock_net(sk), ro->ifindex);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
/* remove current error mask */
|
|
if (ro->bound) {
|
|
/* (try to) register the new err_mask */
|
|
err = raw_enable_errfilter(sock_net(sk), dev, sk,
|
|
err_mask);
|
|
|
|
if (err)
|
|
goto out_err;
|
|
|
|
/* remove old err_mask registration */
|
|
raw_disable_errfilter(sock_net(sk), dev, sk,
|
|
ro->err_mask);
|
|
}
|
|
|
|
/* link new err_mask to the socket */
|
|
ro->err_mask = err_mask;
|
|
|
|
out_err:
|
|
if (dev)
|
|
dev_put(dev);
|
|
|
|
release_sock(sk);
|
|
rtnl_unlock();
|
|
|
|
break;
|
|
|
|
case CAN_RAW_LOOPBACK:
|
|
if (optlen != sizeof(ro->loopback))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&ro->loopback, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
case CAN_RAW_RECV_OWN_MSGS:
|
|
if (optlen != sizeof(ro->recv_own_msgs))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&ro->recv_own_msgs, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
case CAN_RAW_FD_FRAMES:
|
|
if (optlen != sizeof(ro->fd_frames))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&ro->fd_frames, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
case CAN_RAW_JOIN_FILTERS:
|
|
if (optlen != sizeof(ro->join_filters))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_sockptr(&ro->join_filters, optval, optlen))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int raw_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
int len;
|
|
void *val;
|
|
int err = 0;
|
|
|
|
if (level != SOL_CAN_RAW)
|
|
return -EINVAL;
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case CAN_RAW_FILTER:
|
|
lock_sock(sk);
|
|
if (ro->count > 0) {
|
|
int fsize = ro->count * sizeof(struct can_filter);
|
|
|
|
if (len > fsize)
|
|
len = fsize;
|
|
if (copy_to_user(optval, ro->filter, len))
|
|
err = -EFAULT;
|
|
} else {
|
|
len = 0;
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (!err)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
|
|
case CAN_RAW_ERR_FILTER:
|
|
if (len > sizeof(can_err_mask_t))
|
|
len = sizeof(can_err_mask_t);
|
|
val = &ro->err_mask;
|
|
break;
|
|
|
|
case CAN_RAW_LOOPBACK:
|
|
if (len > sizeof(int))
|
|
len = sizeof(int);
|
|
val = &ro->loopback;
|
|
break;
|
|
|
|
case CAN_RAW_RECV_OWN_MSGS:
|
|
if (len > sizeof(int))
|
|
len = sizeof(int);
|
|
val = &ro->recv_own_msgs;
|
|
break;
|
|
|
|
case CAN_RAW_FD_FRAMES:
|
|
if (len > sizeof(int))
|
|
len = sizeof(int);
|
|
val = &ro->fd_frames;
|
|
break;
|
|
|
|
case CAN_RAW_JOIN_FILTERS:
|
|
if (len > sizeof(int))
|
|
len = sizeof(int);
|
|
val = &ro->join_filters;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, val, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct raw_sock *ro = raw_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
int ifindex;
|
|
int err;
|
|
|
|
if (msg->msg_name) {
|
|
DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
|
|
|
|
if (msg->msg_namelen < RAW_MIN_NAMELEN)
|
|
return -EINVAL;
|
|
|
|
if (addr->can_family != AF_CAN)
|
|
return -EINVAL;
|
|
|
|
ifindex = addr->can_ifindex;
|
|
} else {
|
|
ifindex = ro->ifindex;
|
|
}
|
|
|
|
dev = dev_get_by_index(sock_net(sk), ifindex);
|
|
if (!dev)
|
|
return -ENXIO;
|
|
|
|
err = -EINVAL;
|
|
if (ro->fd_frames && dev->mtu == CANFD_MTU) {
|
|
if (unlikely(size != CANFD_MTU && size != CAN_MTU))
|
|
goto put_dev;
|
|
} else {
|
|
if (unlikely(size != CAN_MTU))
|
|
goto put_dev;
|
|
}
|
|
|
|
skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
|
|
msg->msg_flags & MSG_DONTWAIT, &err);
|
|
if (!skb)
|
|
goto put_dev;
|
|
|
|
can_skb_reserve(skb);
|
|
can_skb_prv(skb)->ifindex = dev->ifindex;
|
|
can_skb_prv(skb)->skbcnt = 0;
|
|
|
|
err = memcpy_from_msg(skb_put(skb, size), msg, size);
|
|
if (err < 0)
|
|
goto free_skb;
|
|
|
|
skb_setup_tx_timestamp(skb, sk->sk_tsflags);
|
|
|
|
skb->dev = dev;
|
|
skb->sk = sk;
|
|
skb->priority = sk->sk_priority;
|
|
|
|
err = can_send(skb, 0);
|
|
|
|
dev_put(dev);
|
|
|
|
if (err)
|
|
goto send_failed;
|
|
|
|
return size;
|
|
|
|
free_skb:
|
|
kfree_skb(skb);
|
|
put_dev:
|
|
dev_put(dev);
|
|
send_failed:
|
|
return err;
|
|
}
|
|
|
|
static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct sk_buff *skb;
|
|
int err = 0;
|
|
int noblock;
|
|
|
|
noblock = flags & MSG_DONTWAIT;
|
|
flags &= ~MSG_DONTWAIT;
|
|
|
|
if (flags & MSG_ERRQUEUE)
|
|
return sock_recv_errqueue(sk, msg, size,
|
|
SOL_CAN_RAW, SCM_CAN_RAW_ERRQUEUE);
|
|
|
|
skb = skb_recv_datagram(sk, flags, noblock, &err);
|
|
if (!skb)
|
|
return err;
|
|
|
|
if (size < skb->len)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
else
|
|
size = skb->len;
|
|
|
|
err = memcpy_to_msg(msg, skb->data, size);
|
|
if (err < 0) {
|
|
skb_free_datagram(sk, skb);
|
|
return err;
|
|
}
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
if (msg->msg_name) {
|
|
__sockaddr_check_size(RAW_MIN_NAMELEN);
|
|
msg->msg_namelen = RAW_MIN_NAMELEN;
|
|
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
|
|
}
|
|
|
|
/* assign the flags that have been recorded in raw_rcv() */
|
|
msg->msg_flags |= *(raw_flags(skb));
|
|
|
|
skb_free_datagram(sk, skb);
|
|
|
|
return size;
|
|
}
|
|
|
|
static int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
/* no ioctls for socket layer -> hand it down to NIC layer */
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static const struct proto_ops raw_ops = {
|
|
.family = PF_CAN,
|
|
.release = raw_release,
|
|
.bind = raw_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = raw_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = raw_sock_no_ioctlcmd,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = raw_setsockopt,
|
|
.getsockopt = raw_getsockopt,
|
|
.sendmsg = raw_sendmsg,
|
|
.recvmsg = raw_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static struct proto raw_proto __read_mostly = {
|
|
.name = "CAN_RAW",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct raw_sock),
|
|
.init = raw_init,
|
|
};
|
|
|
|
static const struct can_proto raw_can_proto = {
|
|
.type = SOCK_RAW,
|
|
.protocol = CAN_RAW,
|
|
.ops = &raw_ops,
|
|
.prot = &raw_proto,
|
|
};
|
|
|
|
static struct notifier_block canraw_notifier = {
|
|
.notifier_call = raw_notifier
|
|
};
|
|
|
|
static __init int raw_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("can: raw protocol\n");
|
|
|
|
err = can_proto_register(&raw_can_proto);
|
|
if (err < 0)
|
|
pr_err("can: registration of raw protocol failed\n");
|
|
else
|
|
register_netdevice_notifier(&canraw_notifier);
|
|
|
|
return err;
|
|
}
|
|
|
|
static __exit void raw_module_exit(void)
|
|
{
|
|
can_proto_unregister(&raw_can_proto);
|
|
unregister_netdevice_notifier(&canraw_notifier);
|
|
}
|
|
|
|
module_init(raw_module_init);
|
|
module_exit(raw_module_exit);
|
