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linux-sg2042/net/can/j1939/socket.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2010-2011 EIA Electronics,
// Pieter Beyens <pieter.beyens@eia.be>
// Copyright (c) 2010-2011 EIA Electronics,
// Kurt Van Dijck <kurt.van.dijck@eia.be>
// Copyright (c) 2018 Protonic,
// Robin van der Gracht <robin@protonic.nl>
// Copyright (c) 2017-2019 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
// Copyright (c) 2017-2019 Pengutronix,
// Oleksij Rempel <kernel@pengutronix.de>
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/can/core.h>
#include <linux/can/skb.h>
#include <linux/errqueue.h>
#include <linux/if_arp.h>
#include "j1939-priv.h"
#define J1939_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.j1939)
/* conversion function between struct sock::sk_priority from linux and
* j1939 priority field
*/
static inline priority_t j1939_prio(u32 sk_priority)
{
sk_priority = min(sk_priority, 7U);
return 7 - sk_priority;
}
static inline u32 j1939_to_sk_priority(priority_t prio)
{
return 7 - prio;
}
/* function to see if pgn is to be evaluated */
static inline bool j1939_pgn_is_valid(pgn_t pgn)
{
return pgn <= J1939_PGN_MAX;
}
/* test function to avoid non-zero DA placeholder for pdu1 pgn's */
static inline bool j1939_pgn_is_clean_pdu(pgn_t pgn)
{
if (j1939_pgn_is_pdu1(pgn))
return !(pgn & 0xff);
else
return true;
}
static inline void j1939_sock_pending_add(struct sock *sk)
{
struct j1939_sock *jsk = j1939_sk(sk);
atomic_inc(&jsk->skb_pending);
}
static int j1939_sock_pending_get(struct sock *sk)
{
struct j1939_sock *jsk = j1939_sk(sk);
return atomic_read(&jsk->skb_pending);
}
void j1939_sock_pending_del(struct sock *sk)
{
struct j1939_sock *jsk = j1939_sk(sk);
/* atomic_dec_return returns the new value */
if (!atomic_dec_return(&jsk->skb_pending))
wake_up(&jsk->waitq); /* no pending SKB's */
}
static void j1939_jsk_add(struct j1939_priv *priv, struct j1939_sock *jsk)
{
jsk->state |= J1939_SOCK_BOUND;
j1939_priv_get(priv);
spin_lock_bh(&priv->j1939_socks_lock);
list_add_tail(&jsk->list, &priv->j1939_socks);
spin_unlock_bh(&priv->j1939_socks_lock);
}
static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk)
{
spin_lock_bh(&priv->j1939_socks_lock);
list_del_init(&jsk->list);
spin_unlock_bh(&priv->j1939_socks_lock);
j1939_priv_put(priv);
jsk->state &= ~J1939_SOCK_BOUND;
}
static bool j1939_sk_queue_session(struct j1939_session *session)
{
struct j1939_sock *jsk = j1939_sk(session->sk);
bool empty;
spin_lock_bh(&jsk->sk_session_queue_lock);
empty = list_empty(&jsk->sk_session_queue);
j1939_session_get(session);
list_add_tail(&session->sk_session_queue_entry, &jsk->sk_session_queue);
spin_unlock_bh(&jsk->sk_session_queue_lock);
j1939_sock_pending_add(&jsk->sk);
return empty;
}
static struct
j1939_session *j1939_sk_get_incomplete_session(struct j1939_sock *jsk)
{
struct j1939_session *session = NULL;
spin_lock_bh(&jsk->sk_session_queue_lock);
if (!list_empty(&jsk->sk_session_queue)) {
session = list_last_entry(&jsk->sk_session_queue,
struct j1939_session,
sk_session_queue_entry);
if (session->total_queued_size == session->total_message_size)
session = NULL;
else
j1939_session_get(session);
}
spin_unlock_bh(&jsk->sk_session_queue_lock);
return session;
}
static void j1939_sk_queue_drop_all(struct j1939_priv *priv,
struct j1939_sock *jsk, int err)
{
struct j1939_session *session, *tmp;
netdev_dbg(priv->ndev, "%s: err: %i\n", __func__, err);
spin_lock_bh(&jsk->sk_session_queue_lock);
list_for_each_entry_safe(session, tmp, &jsk->sk_session_queue,
sk_session_queue_entry) {
list_del_init(&session->sk_session_queue_entry);
session->err = err;
j1939_session_put(session);
}
spin_unlock_bh(&jsk->sk_session_queue_lock);
}
static void j1939_sk_queue_activate_next_locked(struct j1939_session *session)
{
struct j1939_sock *jsk;
struct j1939_session *first;
int err;
/* RX-Session don't have a socket (yet) */
if (!session->sk)
return;
jsk = j1939_sk(session->sk);
lockdep_assert_held(&jsk->sk_session_queue_lock);
err = session->err;
first = list_first_entry_or_null(&jsk->sk_session_queue,
struct j1939_session,
sk_session_queue_entry);
/* Some else has already activated the next session */
if (first != session)
return;
activate_next:
list_del_init(&first->sk_session_queue_entry);
j1939_session_put(first);
first = list_first_entry_or_null(&jsk->sk_session_queue,
struct j1939_session,
sk_session_queue_entry);
if (!first)
return;
if (WARN_ON_ONCE(j1939_session_activate(first))) {
first->err = -EBUSY;
goto activate_next;
} else {
/* Give receiver some time (arbitrary chosen) to recover */
int time_ms = 0;
if (err)
time_ms = 10 + prandom_u32_max(16);
j1939_tp_schedule_txtimer(first, time_ms);
}
}
void j1939_sk_queue_activate_next(struct j1939_session *session)
{
struct j1939_sock *jsk;
if (!session->sk)
return;
jsk = j1939_sk(session->sk);
spin_lock_bh(&jsk->sk_session_queue_lock);
j1939_sk_queue_activate_next_locked(session);
spin_unlock_bh(&jsk->sk_session_queue_lock);
}
static bool j1939_sk_match_dst(struct j1939_sock *jsk,
const struct j1939_sk_buff_cb *skcb)
{
if ((jsk->state & J1939_SOCK_PROMISC))
return true;
/* Destination address filter */
if (jsk->addr.src_name && skcb->addr.dst_name) {
if (jsk->addr.src_name != skcb->addr.dst_name)
return false;
} else {
/* receive (all sockets) if
* - all packages that match our bind() address
* - all broadcast on a socket if SO_BROADCAST
* is set
*/
if (j1939_address_is_unicast(skcb->addr.da)) {
if (jsk->addr.sa != skcb->addr.da)
return false;
} else if (!sock_flag(&jsk->sk, SOCK_BROADCAST)) {
/* receiving broadcast without SO_BROADCAST
* flag is not allowed
*/
return false;
}
}
/* Source address filter */
if (jsk->state & J1939_SOCK_CONNECTED) {
/* receive (all sockets) if
* - all packages that match our connect() name or address
*/
if (jsk->addr.dst_name && skcb->addr.src_name) {
if (jsk->addr.dst_name != skcb->addr.src_name)
return false;
} else {
if (jsk->addr.da != skcb->addr.sa)
return false;
}
}
/* PGN filter */
if (j1939_pgn_is_valid(jsk->pgn_rx_filter) &&
jsk->pgn_rx_filter != skcb->addr.pgn)
return false;
return true;
}
/* matches skb control buffer (addr) with a j1939 filter */
static bool j1939_sk_match_filter(struct j1939_sock *jsk,
const struct j1939_sk_buff_cb *skcb)
{
const struct j1939_filter *f = jsk->filters;
int nfilter = jsk->nfilters;
if (!nfilter)
/* receive all when no filters are assigned */
return true;
for (; nfilter; ++f, --nfilter) {
if ((skcb->addr.pgn & f->pgn_mask) != f->pgn)
continue;
if ((skcb->addr.sa & f->addr_mask) != f->addr)
continue;
if ((skcb->addr.src_name & f->name_mask) != f->name)
continue;
return true;
}
return false;
}
static bool j1939_sk_recv_match_one(struct j1939_sock *jsk,
const struct j1939_sk_buff_cb *skcb)
{
if (!(jsk->state & J1939_SOCK_BOUND))
return false;
if (!j1939_sk_match_dst(jsk, skcb))
return false;
if (!j1939_sk_match_filter(jsk, skcb))
return false;
return true;
}
static void j1939_sk_recv_one(struct j1939_sock *jsk, struct sk_buff *oskb)
{
const struct j1939_sk_buff_cb *oskcb = j1939_skb_to_cb(oskb);
struct j1939_sk_buff_cb *skcb;
struct sk_buff *skb;
if (oskb->sk == &jsk->sk)
return;
if (!j1939_sk_recv_match_one(jsk, oskcb))
return;
skb = skb_clone(oskb, GFP_ATOMIC);
if (!skb) {
pr_warn("skb clone failed\n");
return;
}
can_skb_set_owner(skb, oskb->sk);
skcb = j1939_skb_to_cb(skb);
skcb->msg_flags &= ~(MSG_DONTROUTE);
if (skb->sk)
skcb->msg_flags |= MSG_DONTROUTE;
if (sock_queue_rcv_skb(&jsk->sk, skb) < 0)
kfree_skb(skb);
}
bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb)
{
struct j1939_sock *jsk;
bool match = false;
spin_lock_bh(&priv->j1939_socks_lock);
list_for_each_entry(jsk, &priv->j1939_socks, list) {
match = j1939_sk_recv_match_one(jsk, skcb);
if (match)
break;
}
spin_unlock_bh(&priv->j1939_socks_lock);
return match;
}
void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb)
{
struct j1939_sock *jsk;
spin_lock_bh(&priv->j1939_socks_lock);
list_for_each_entry(jsk, &priv->j1939_socks, list) {
j1939_sk_recv_one(jsk, skb);
}
spin_unlock_bh(&priv->j1939_socks_lock);
}
static void j1939_sk_sock_destruct(struct sock *sk)
{
struct j1939_sock *jsk = j1939_sk(sk);
/* This function will be call by the generic networking code, when then
* the socket is ultimately closed (sk->sk_destruct).
*
* The race between
* - processing a received CAN frame
* (can_receive -> j1939_can_recv)
* and accessing j1939_priv
* ... and ...
* - closing a socket
* (j1939_can_rx_unregister -> can_rx_unregister)
* and calling the final j1939_priv_put()
*
* is avoided by calling the final j1939_priv_put() from this
* RCU deferred cleanup call.
*/
if (jsk->priv) {
j1939_priv_put(jsk->priv);
jsk->priv = NULL;
}
/* call generic CAN sock destruct */
can_sock_destruct(sk);
}
static int j1939_sk_init(struct sock *sk)
{
struct j1939_sock *jsk = j1939_sk(sk);
/* Ensure that "sk" is first member in "struct j1939_sock", so that we
* can skip it during memset().
*/
BUILD_BUG_ON(offsetof(struct j1939_sock, sk) != 0);
memset((void *)jsk + sizeof(jsk->sk), 0x0,
sizeof(*jsk) - sizeof(jsk->sk));
INIT_LIST_HEAD(&jsk->list);
init_waitqueue_head(&jsk->waitq);
jsk->sk.sk_priority = j1939_to_sk_priority(6);
jsk->sk.sk_reuse = 1; /* per default */
jsk->addr.sa = J1939_NO_ADDR;
jsk->addr.da = J1939_NO_ADDR;
jsk->addr.pgn = J1939_NO_PGN;
jsk->pgn_rx_filter = J1939_NO_PGN;
atomic_set(&jsk->skb_pending, 0);
spin_lock_init(&jsk->sk_session_queue_lock);
INIT_LIST_HEAD(&jsk->sk_session_queue);
sk->sk_destruct = j1939_sk_sock_destruct;
return 0;
}
static int j1939_sk_sanity_check(struct sockaddr_can *addr, int len)
{
if (!addr)
return -EDESTADDRREQ;
if (len < J1939_MIN_NAMELEN)
return -EINVAL;
if (addr->can_family != AF_CAN)
return -EINVAL;
if (!addr->can_ifindex)
return -ENODEV;
if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
!j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn))
return -EINVAL;
return 0;
}
static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len)
{
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
struct j1939_sock *jsk = j1939_sk(sock->sk);
struct j1939_priv *priv;
struct sock *sk;
struct net *net;
int ret = 0;
ret = j1939_sk_sanity_check(addr, len);
if (ret)
return ret;
lock_sock(sock->sk);
priv = jsk->priv;
sk = sock->sk;
net = sock_net(sk);
/* Already bound to an interface? */
if (jsk->state & J1939_SOCK_BOUND) {
/* A re-bind() to a different interface is not
* supported.
*/
if (jsk->ifindex != addr->can_ifindex) {
ret = -EINVAL;
goto out_release_sock;
}
/* drop old references */
j1939_jsk_del(priv, jsk);
j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa);
} else {
struct net_device *ndev;
ndev = dev_get_by_index(net, addr->can_ifindex);
if (!ndev) {
ret = -ENODEV;
goto out_release_sock;
}
if (ndev->type != ARPHRD_CAN) {
dev_put(ndev);
ret = -ENODEV;
goto out_release_sock;
}
priv = j1939_netdev_start(ndev);
dev_put(ndev);
if (IS_ERR(priv)) {
ret = PTR_ERR(priv);
goto out_release_sock;
}
jsk->ifindex = addr->can_ifindex;
/* the corresponding j1939_priv_put() is called via
* sk->sk_destruct, which points to j1939_sk_sock_destruct()
*/
j1939_priv_get(priv);
jsk->priv = priv;
}
/* set default transmit pgn */
if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
jsk->pgn_rx_filter = addr->can_addr.j1939.pgn;
jsk->addr.src_name = addr->can_addr.j1939.name;
jsk->addr.sa = addr->can_addr.j1939.addr;
/* get new references */
ret = j1939_local_ecu_get(priv, jsk->addr.src_name, jsk->addr.sa);
if (ret) {
j1939_netdev_stop(priv);
goto out_release_sock;
}
j1939_jsk_add(priv, jsk);
out_release_sock: /* fall through */
release_sock(sock->sk);
return ret;
}
static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr,
int len, int flags)
{
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
struct j1939_sock *jsk = j1939_sk(sock->sk);
int ret = 0;
ret = j1939_sk_sanity_check(addr, len);
if (ret)
return ret;
lock_sock(sock->sk);
/* bind() before connect() is mandatory */
if (!(jsk->state & J1939_SOCK_BOUND)) {
ret = -EINVAL;
goto out_release_sock;
}
/* A connect() to a different interface is not supported. */
if (jsk->ifindex != addr->can_ifindex) {
ret = -EINVAL;
goto out_release_sock;
}
if (!addr->can_addr.j1939.name &&
addr->can_addr.j1939.addr == J1939_NO_ADDR &&
!sock_flag(&jsk->sk, SOCK_BROADCAST)) {
/* broadcast, but SO_BROADCAST not set */
ret = -EACCES;
goto out_release_sock;
}
jsk->addr.dst_name = addr->can_addr.j1939.name;
jsk->addr.da = addr->can_addr.j1939.addr;
if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
jsk->addr.pgn = addr->can_addr.j1939.pgn;
jsk->state |= J1939_SOCK_CONNECTED;
out_release_sock: /* fall through */
release_sock(sock->sk);
return ret;
}
static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr,
const struct j1939_sock *jsk, int peer)
{
addr->can_family = AF_CAN;
addr->can_ifindex = jsk->ifindex;
addr->can_addr.j1939.pgn = jsk->addr.pgn;
if (peer) {
addr->can_addr.j1939.name = jsk->addr.dst_name;
addr->can_addr.j1939.addr = jsk->addr.da;
} else {
addr->can_addr.j1939.name = jsk->addr.src_name;
addr->can_addr.j1939.addr = jsk->addr.sa;
}
}
static int j1939_sk_getname(struct socket *sock, struct sockaddr *uaddr,
int peer)
{
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
struct sock *sk = sock->sk;
struct j1939_sock *jsk = j1939_sk(sk);
int ret = 0;
lock_sock(sk);
if (peer && !(jsk->state & J1939_SOCK_CONNECTED)) {
ret = -EADDRNOTAVAIL;
goto failure;
}
j1939_sk_sock2sockaddr_can(addr, jsk, peer);
ret = J1939_MIN_NAMELEN;
failure:
release_sock(sk);
return ret;
}
static int j1939_sk_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct j1939_sock *jsk;
if (!sk)
return 0;
lock_sock(sk);
jsk = j1939_sk(sk);
if (jsk->state & J1939_SOCK_BOUND) {
struct j1939_priv *priv = jsk->priv;
if (wait_event_interruptible(jsk->waitq,
!j1939_sock_pending_get(&jsk->sk))) {
j1939_cancel_active_session(priv, sk);
j1939_sk_queue_drop_all(priv, jsk, ESHUTDOWN);
}
j1939_jsk_del(priv, jsk);
j1939_local_ecu_put(priv, jsk->addr.src_name,
jsk->addr.sa);
j1939_netdev_stop(priv);
}
kfree(jsk->filters);
sock_orphan(sk);
sock->sk = NULL;
release_sock(sk);
sock_put(sk);
return 0;
}
static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
unsigned int optlen, int flag)
{
int tmp;
if (optlen != sizeof(tmp))
return -EINVAL;
if (copy_from_user(&tmp, optval, optlen))
return -EFAULT;
lock_sock(&jsk->sk);
if (tmp)
jsk->state |= flag;
else
jsk->state &= ~flag;
release_sock(&jsk->sk);
return tmp;
}
static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
struct j1939_sock *jsk = j1939_sk(sk);
int tmp, count = 0, ret = 0;
struct j1939_filter *filters = NULL, *ofilters;
if (level != SOL_CAN_J1939)
return -EINVAL;
switch (optname) {
case SO_J1939_FILTER:
if (optval) {
struct j1939_filter *f;
int c;
if (optlen % sizeof(*filters) != 0)
return -EINVAL;
if (optlen > J1939_FILTER_MAX *
sizeof(struct j1939_filter))
return -EINVAL;
count = optlen / sizeof(*filters);
filters = memdup_user(optval, optlen);
if (IS_ERR(filters))
return PTR_ERR(filters);
for (f = filters, c = count; c; f++, c--) {
f->name &= f->name_mask;
f->pgn &= f->pgn_mask;
f->addr &= f->addr_mask;
}
}
lock_sock(&jsk->sk);
ofilters = jsk->filters;
jsk->filters = filters;
jsk->nfilters = count;
release_sock(&jsk->sk);
kfree(ofilters);
return 0;
case SO_J1939_PROMISC:
return j1939_sk_setsockopt_flag(jsk, optval, optlen,
J1939_SOCK_PROMISC);
case SO_J1939_ERRQUEUE:
ret = j1939_sk_setsockopt_flag(jsk, optval, optlen,
J1939_SOCK_ERRQUEUE);
if (ret < 0)
return ret;
if (!(jsk->state & J1939_SOCK_ERRQUEUE))
skb_queue_purge(&sk->sk_error_queue);
return ret;
case SO_J1939_SEND_PRIO:
if (optlen != sizeof(tmp))
return -EINVAL;
if (copy_from_user(&tmp, optval, optlen))
return -EFAULT;
if (tmp < 0 || tmp > 7)
return -EDOM;
if (tmp < 2 && !capable(CAP_NET_ADMIN))
return -EPERM;
lock_sock(&jsk->sk);
jsk->sk.sk_priority = j1939_to_sk_priority(tmp);
release_sock(&jsk->sk);
return 0;
default:
return -ENOPROTOOPT;
}
}
static int j1939_sk_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
struct j1939_sock *jsk = j1939_sk(sk);
int ret, ulen;
/* set defaults for using 'int' properties */
int tmp = 0;
int len = sizeof(tmp);
void *val = &tmp;
if (level != SOL_CAN_J1939)
return -EINVAL;
if (get_user(ulen, optlen))
return -EFAULT;
if (ulen < 0)
return -EINVAL;
lock_sock(&jsk->sk);
switch (optname) {
case SO_J1939_PROMISC:
tmp = (jsk->state & J1939_SOCK_PROMISC) ? 1 : 0;
break;
case SO_J1939_ERRQUEUE:
tmp = (jsk->state & J1939_SOCK_ERRQUEUE) ? 1 : 0;
break;
case SO_J1939_SEND_PRIO:
tmp = j1939_prio(jsk->sk.sk_priority);
break;
default:
ret = -ENOPROTOOPT;
goto no_copy;
}
/* copy to user, based on 'len' & 'val'
* but most sockopt's are 'int' properties, and have 'len' & 'val'
* left unchanged, but instead modified 'tmp'
*/
if (len > ulen)
ret = -EFAULT;
else if (put_user(len, optlen))
ret = -EFAULT;
else if (copy_to_user(optval, val, len))
ret = -EFAULT;
else
ret = 0;
no_copy:
release_sock(&jsk->sk);
return ret;
}
static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg,
size_t size, int flags)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
struct j1939_sk_buff_cb *skcb;
int ret = 0;
if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE))
return -EINVAL;
if (flags & MSG_ERRQUEUE)
return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939,
SCM_J1939_ERRQUEUE);
skb = skb_recv_datagram(sk, flags, 0, &ret);
if (!skb)
return ret;
if (size < skb->len)
msg->msg_flags |= MSG_TRUNC;
else
size = skb->len;
ret = memcpy_to_msg(msg, skb->data, size);
if (ret < 0) {
skb_free_datagram(sk, skb);
return ret;
}
skcb = j1939_skb_to_cb(skb);
if (j1939_address_is_valid(skcb->addr.da))
put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_ADDR,
sizeof(skcb->addr.da), &skcb->addr.da);
if (skcb->addr.dst_name)
put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_NAME,
sizeof(skcb->addr.dst_name), &skcb->addr.dst_name);
put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_PRIO,
sizeof(skcb->priority), &skcb->priority);
if (msg->msg_name) {
struct sockaddr_can *paddr = msg->msg_name;
msg->msg_namelen = J1939_MIN_NAMELEN;
memset(msg->msg_name, 0, msg->msg_namelen);
paddr->can_family = AF_CAN;
paddr->can_ifindex = skb->skb_iif;
paddr->can_addr.j1939.name = skcb->addr.src_name;
paddr->can_addr.j1939.addr = skcb->addr.sa;
paddr->can_addr.j1939.pgn = skcb->addr.pgn;
}
sock_recv_ts_and_drops(msg, sk, skb);
msg->msg_flags |= skcb->msg_flags;
skb_free_datagram(sk, skb);
return size;
}
static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev,
struct sock *sk,
struct msghdr *msg, size_t size,
int *errcode)
{
struct j1939_sock *jsk = j1939_sk(sk);
struct j1939_sk_buff_cb *skcb;
struct sk_buff *skb;
int ret;
skb = sock_alloc_send_skb(sk,
size +
sizeof(struct can_frame) -
sizeof(((struct can_frame *)NULL)->data) +
sizeof(struct can_skb_priv),
msg->msg_flags & MSG_DONTWAIT, &ret);
if (!skb)
goto failure;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = ndev->ifindex;
can_skb_prv(skb)->skbcnt = 0;
skb_reserve(skb, offsetof(struct can_frame, data));
ret = memcpy_from_msg(skb_put(skb, size), msg, size);
if (ret < 0)
goto free_skb;
skb->dev = ndev;
skcb = j1939_skb_to_cb(skb);
memset(skcb, 0, sizeof(*skcb));
skcb->addr = jsk->addr;
skcb->priority = j1939_prio(sk->sk_priority);
if (msg->msg_name) {
struct sockaddr_can *addr = msg->msg_name;
if (addr->can_addr.j1939.name ||
addr->can_addr.j1939.addr != J1939_NO_ADDR) {
skcb->addr.dst_name = addr->can_addr.j1939.name;
skcb->addr.da = addr->can_addr.j1939.addr;
}
if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
skcb->addr.pgn = addr->can_addr.j1939.pgn;
}
*errcode = ret;
return skb;
free_skb:
kfree_skb(skb);
failure:
*errcode = ret;
return NULL;
}
static size_t j1939_sk_opt_stats_get_size(void)
{
return
nla_total_size(sizeof(u32)) + /* J1939_NLA_BYTES_ACKED */
0;
}
static struct sk_buff *
j1939_sk_get_timestamping_opt_stats(struct j1939_session *session)
{
struct sk_buff *stats;
u32 size;
stats = alloc_skb(j1939_sk_opt_stats_get_size(), GFP_ATOMIC);
if (!stats)
return NULL;
if (session->skcb.addr.type == J1939_SIMPLE)
size = session->total_message_size;
else
size = min(session->pkt.tx_acked * 7,
session->total_message_size);
nla_put_u32(stats, J1939_NLA_BYTES_ACKED, size);
return stats;
}
void j1939_sk_errqueue(struct j1939_session *session,
enum j1939_sk_errqueue_type type)
{
struct j1939_priv *priv = session->priv;
struct sock *sk = session->sk;
struct j1939_sock *jsk;
struct sock_exterr_skb *serr;
struct sk_buff *skb;
char *state = "UNK";
int err;
/* currently we have no sk for the RX session */
if (!sk)
return;
jsk = j1939_sk(sk);
if (!(jsk->state & J1939_SOCK_ERRQUEUE))
return;
skb = j1939_sk_get_timestamping_opt_stats(session);
if (!skb)
return;
skb->tstamp = ktime_get_real();
BUILD_BUG_ON(sizeof(struct sock_exterr_skb) > sizeof(skb->cb));
serr = SKB_EXT_ERR(skb);
memset(serr, 0, sizeof(*serr));
switch (type) {
case J1939_ERRQUEUE_ACK:
if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)) {
kfree_skb(skb);
return;
}
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
serr->ee.ee_info = SCM_TSTAMP_ACK;
state = "ACK";
break;
case J1939_ERRQUEUE_SCHED:
if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)) {
kfree_skb(skb);
return;
}
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
serr->ee.ee_info = SCM_TSTAMP_SCHED;
state = "SCH";
break;
case J1939_ERRQUEUE_ABORT:
serr->ee.ee_errno = session->err;
serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
serr->ee.ee_info = J1939_EE_INFO_TX_ABORT;
state = "ABT";
break;
default:
netdev_err(priv->ndev, "Unknown errqueue type %i\n", type);
}
serr->opt_stats = true;
if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
serr->ee.ee_data = session->tskey;
netdev_dbg(session->priv->ndev, "%s: 0x%p tskey: %i, state: %s\n",
__func__, session, session->tskey, state);
err = sock_queue_err_skb(sk, skb);
if (err)
kfree_skb(skb);
};
void j1939_sk_send_loop_abort(struct sock *sk, int err)
{
sk->sk_err = err;
sk->sk_error_report(sk);
}
static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk,
struct msghdr *msg, size_t size)
{
struct j1939_sock *jsk = j1939_sk(sk);
struct j1939_session *session = j1939_sk_get_incomplete_session(jsk);
struct sk_buff *skb;
size_t segment_size, todo_size;
int ret = 0;
if (session &&
session->total_message_size != session->total_queued_size + size) {
j1939_session_put(session);
return -EIO;
}
todo_size = size;
while (todo_size) {
struct j1939_sk_buff_cb *skcb;
segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE,
todo_size);
/* Allocate skb for one segment */
skb = j1939_sk_alloc_skb(priv->ndev, sk, msg, segment_size,
&ret);
if (ret)
break;
skcb = j1939_skb_to_cb(skb);
if (!session) {
/* at this point the size should be full size
* of the session
*/
skcb->offset = 0;
session = j1939_tp_send(priv, skb, size);
if (IS_ERR(session)) {
ret = PTR_ERR(session);
goto kfree_skb;
}
if (j1939_sk_queue_session(session)) {
/* try to activate session if we a
* fist in the queue
*/
if (!j1939_session_activate(session)) {
j1939_tp_schedule_txtimer(session, 0);
} else {
ret = -EBUSY;
session->err = ret;
j1939_sk_queue_drop_all(priv, jsk,
EBUSY);
break;
}
}
} else {
skcb->offset = session->total_queued_size;
j1939_session_skb_queue(session, skb);
}
todo_size -= segment_size;
session->total_queued_size += segment_size;
}
switch (ret) {
case 0: /* OK */
if (todo_size)
netdev_warn(priv->ndev,
"no error found and not completely queued?! %zu\n",
todo_size);
ret = size;
break;
case -ERESTARTSYS:
ret = -EINTR;
/* fall through */
case -EAGAIN: /* OK */
if (todo_size != size)
ret = size - todo_size;
break;
default: /* ERROR */
break;
}
if (session)
j1939_session_put(session);
return ret;
kfree_skb:
kfree_skb(skb);
return ret;
}
static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg,
size_t size)
{
struct sock *sk = sock->sk;
struct j1939_sock *jsk = j1939_sk(sk);
struct j1939_priv *priv;
int ifindex;
int ret;
lock_sock(sock->sk);
/* various socket state tests */
if (!(jsk->state & J1939_SOCK_BOUND)) {
ret = -EBADFD;
goto sendmsg_done;
}
priv = jsk->priv;
ifindex = jsk->ifindex;
if (!jsk->addr.src_name && jsk->addr.sa == J1939_NO_ADDR) {
/* no source address assigned yet */
ret = -EBADFD;
goto sendmsg_done;
}
/* deal with provided destination address info */
if (msg->msg_name) {
struct sockaddr_can *addr = msg->msg_name;
if (msg->msg_namelen < J1939_MIN_NAMELEN) {
ret = -EINVAL;
goto sendmsg_done;
}
if (addr->can_family != AF_CAN) {
ret = -EINVAL;
goto sendmsg_done;
}
if (addr->can_ifindex && addr->can_ifindex != ifindex) {
ret = -EBADFD;
goto sendmsg_done;
}
if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
!j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) {
ret = -EINVAL;
goto sendmsg_done;
}
if (!addr->can_addr.j1939.name &&
addr->can_addr.j1939.addr == J1939_NO_ADDR &&
!sock_flag(sk, SOCK_BROADCAST)) {
/* broadcast, but SO_BROADCAST not set */
ret = -EACCES;
goto sendmsg_done;
}
} else {
if (!jsk->addr.dst_name && jsk->addr.da == J1939_NO_ADDR &&
!sock_flag(sk, SOCK_BROADCAST)) {
/* broadcast, but SO_BROADCAST not set */
ret = -EACCES;
goto sendmsg_done;
}
}
ret = j1939_sk_send_loop(priv, sk, msg, size);
sendmsg_done:
release_sock(sock->sk);
return ret;
}
void j1939_sk_netdev_event_netdown(struct j1939_priv *priv)
{
struct j1939_sock *jsk;
int error_code = ENETDOWN;
spin_lock_bh(&priv->j1939_socks_lock);
list_for_each_entry(jsk, &priv->j1939_socks, list) {
jsk->sk.sk_err = error_code;
if (!sock_flag(&jsk->sk, SOCK_DEAD))
jsk->sk.sk_error_report(&jsk->sk);
j1939_sk_queue_drop_all(priv, jsk, error_code);
}
spin_unlock_bh(&priv->j1939_socks_lock);
}
static int j1939_sk_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 j1939_ops = {
.family = PF_CAN,
.release = j1939_sk_release,
.bind = j1939_sk_bind,
.connect = j1939_sk_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = j1939_sk_getname,
.poll = datagram_poll,
.ioctl = j1939_sk_no_ioctlcmd,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = j1939_sk_setsockopt,
.getsockopt = j1939_sk_getsockopt,
.sendmsg = j1939_sk_sendmsg,
.recvmsg = j1939_sk_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
static struct proto j1939_proto __read_mostly = {
.name = "CAN_J1939",
.owner = THIS_MODULE,
.obj_size = sizeof(struct j1939_sock),
.init = j1939_sk_init,
};
const struct can_proto j1939_can_proto = {
.type = SOCK_DGRAM,
.protocol = CAN_J1939,
.ops = &j1939_ops,
.prot = &j1939_proto,
};
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