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Diffstat (limited to 'net/ax25/af_ax25.c')
-rw-r--r--net/ax25/af_ax25.c139
1 files changed, 106 insertions, 33 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index ff57ea89c27e..6b4c25a92377 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -62,12 +62,12 @@ static void ax25_free_sock(struct sock *sk)
*/
static void ax25_cb_del(ax25_cb *ax25)
{
+ spin_lock_bh(&ax25_list_lock);
if (!hlist_unhashed(&ax25->ax25_node)) {
- spin_lock_bh(&ax25_list_lock);
hlist_del_init(&ax25->ax25_node);
- spin_unlock_bh(&ax25_list_lock);
ax25_cb_put(ax25);
}
+ spin_unlock_bh(&ax25_list_lock);
}
/*
@@ -77,19 +77,39 @@ static void ax25_kill_by_device(struct net_device *dev)
{
ax25_dev *ax25_dev;
ax25_cb *s;
+ struct sock *sk;
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
return;
+ ax25_dev->device_up = false;
spin_lock_bh(&ax25_list_lock);
again:
ax25_for_each(s, &ax25_list) {
if (s->ax25_dev == ax25_dev) {
- s->ax25_dev = NULL;
+ sk = s->sk;
+ if (!sk) {
+ spin_unlock_bh(&ax25_list_lock);
+ ax25_disconnect(s, ENETUNREACH);
+ s->ax25_dev = NULL;
+ ax25_cb_del(s);
+ spin_lock_bh(&ax25_list_lock);
+ goto again;
+ }
+ sock_hold(sk);
spin_unlock_bh(&ax25_list_lock);
+ lock_sock(sk);
ax25_disconnect(s, ENETUNREACH);
+ s->ax25_dev = NULL;
+ if (sk->sk_socket) {
+ netdev_put(ax25_dev->dev,
+ &ax25_dev->dev_tracker);
+ ax25_dev_put(ax25_dev);
+ }
+ ax25_cb_del(s);
+ release_sock(sk);
spin_lock_bh(&ax25_list_lock);
-
+ sock_put(sk);
/* The entry could have been deleted from the
* list meanwhile and thus the next pointer is
* no longer valid. Play it safe and restart
@@ -202,7 +222,7 @@ struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
* Find an AX.25 control block given both ends. It will only pick up
* floating AX.25 control blocks or non Raw socket bound control blocks.
*/
-ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
+ax25_cb *ax25_find_cb(const ax25_address *src_addr, ax25_address *dest_addr,
ax25_digi *digi, struct net_device *dev)
{
ax25_cb *s;
@@ -353,21 +373,25 @@ static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
return -EFAULT;
- if ((ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr)) == NULL)
- return -ENODEV;
-
if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
return -EINVAL;
if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
return -EINVAL;
+ ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr);
+ if (!ax25_dev)
+ return -ENODEV;
+
digi.ndigi = ax25_ctl.digi_count;
for (k = 0; k < digi.ndigi; k++)
digi.calls[k] = ax25_ctl.digi_addr[k];
- if ((ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev)) == NULL)
+ ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev);
+ if (!ax25) {
+ ax25_dev_put(ax25_dev);
return -ENOTCONN;
+ }
switch (ax25_ctl.cmd) {
case AX25_KILL:
@@ -434,6 +458,7 @@ static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
}
out_put:
+ ax25_dev_put(ax25_dev);
ax25_cb_put(ax25);
return ret;
@@ -528,13 +553,13 @@ ax25_cb *ax25_create_cb(void)
*/
static int ax25_setsockopt(struct socket *sock, int level, int optname,
- char __user *optval, unsigned int optlen)
+ sockptr_t optval, unsigned int optlen)
{
struct sock *sk = sock->sk;
ax25_cb *ax25;
struct net_device *dev;
char devname[IFNAMSIZ];
- unsigned long opt;
+ unsigned int opt;
int res = 0;
if (level != SOL_AX25)
@@ -543,7 +568,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
if (optlen < sizeof(unsigned int))
return -EINVAL;
- if (get_user(opt, (unsigned int __user *)optval))
+ if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
return -EFAULT;
lock_sock(sk);
@@ -566,7 +591,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;
case AX25_T1:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -575,7 +600,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;
case AX25_T2:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -591,7 +616,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;
case AX25_T3:
- if (opt < 1 || opt > ULONG_MAX / HZ) {
+ if (opt < 1 || opt > UINT_MAX / HZ) {
res = -EINVAL;
break;
}
@@ -599,7 +624,7 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;
case AX25_IDLE:
- if (opt > ULONG_MAX / (60 * HZ)) {
+ if (opt > UINT_MAX / (60 * HZ)) {
res = -EINVAL;
break;
}
@@ -635,10 +660,12 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
break;
case SO_BINDTODEVICE:
- if (optlen > IFNAMSIZ)
- optlen = IFNAMSIZ;
+ if (optlen > IFNAMSIZ - 1)
+ optlen = IFNAMSIZ - 1;
+
+ memset(devname, 0, sizeof(devname));
- if (copy_from_user(devname, optval, optlen)) {
+ if (copy_from_sockptr(devname, optval, optlen)) {
res = -EFAULT;
break;
}
@@ -751,7 +778,7 @@ static int ax25_getsockopt(struct socket *sock, int level, int optname,
ax25_dev = ax25->ax25_dev;
if (ax25_dev != NULL && ax25_dev->dev != NULL) {
- strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
+ strscpy(devname, ax25_dev->dev->name, sizeof(devname));
length = strlen(devname) + 1;
} else {
*devname = '\0';
@@ -848,6 +875,7 @@ static int ax25_create(struct net *net, struct socket *sock, int protocol,
case AX25_P_ROSE:
if (ax25_protocol_is_registered(AX25_P_ROSE))
return -ESOCKTNOSUPPORT;
+ break;
#endif
default:
break;
@@ -957,21 +985,25 @@ static int ax25_release(struct socket *sock)
{
struct sock *sk = sock->sk;
ax25_cb *ax25;
+ ax25_dev *ax25_dev;
if (sk == NULL)
return 0;
sock_hold(sk);
- sock_orphan(sk);
lock_sock(sk);
+ sock_orphan(sk);
ax25 = sk_to_ax25(sk);
+ ax25_dev = ax25->ax25_dev;
if (sk->sk_type == SOCK_SEQPACKET) {
switch (ax25->state) {
case AX25_STATE_0:
- release_sock(sk);
- ax25_disconnect(ax25, 0);
- lock_sock(sk);
+ if (!sock_flag(ax25->sk, SOCK_DEAD)) {
+ release_sock(sk);
+ ax25_disconnect(ax25, 0);
+ lock_sock(sk);
+ }
ax25_destroy_socket(ax25);
break;
@@ -1026,6 +1058,17 @@ static int ax25_release(struct socket *sock)
sk->sk_state_change(sk);
ax25_destroy_socket(ax25);
}
+ if (ax25_dev) {
+ if (!ax25_dev->device_up) {
+ del_timer_sync(&ax25->timer);
+ del_timer_sync(&ax25->t1timer);
+ del_timer_sync(&ax25->t2timer);
+ del_timer_sync(&ax25->t3timer);
+ del_timer_sync(&ax25->idletimer);
+ }
+ netdev_put(ax25_dev->dev, &ax25->dev_tracker);
+ ax25_dev_put(ax25_dev);
+ }
sock->sk = NULL;
release_sock(sk);
@@ -1102,8 +1145,10 @@ static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
}
}
- if (ax25_dev != NULL)
+ if (ax25_dev) {
ax25_fillin_cb(ax25, ax25_dev);
+ netdev_hold(ax25_dev->dev, &ax25->dev_tracker, GFP_ATOMIC);
+ }
done:
ax25_cb_add(ax25);
@@ -1185,7 +1230,10 @@ static int __must_check ax25_connect(struct socket *sock,
if (addr_len > sizeof(struct sockaddr_ax25) &&
fsa->fsa_ax25.sax25_ndigis != 0) {
/* Valid number of digipeaters ? */
- if (fsa->fsa_ax25.sax25_ndigis < 1 || fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS) {
+ if (fsa->fsa_ax25.sax25_ndigis < 1 ||
+ fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS ||
+ addr_len < sizeof(struct sockaddr_ax25) +
+ sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) {
err = -EINVAL;
goto out_release;
}
@@ -1505,7 +1553,10 @@ static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
/* Valid number of digipeaters ? */
- if (usax->sax25_ndigis < 1 || usax->sax25_ndigis > AX25_MAX_DIGIS) {
+ if (usax->sax25_ndigis < 1 ||
+ usax->sax25_ndigis > AX25_MAX_DIGIS ||
+ addr_len < sizeof(struct sockaddr_ax25) +
+ sizeof(ax25_address) * usax->sax25_ndigis) {
err = -EINVAL;
goto out;
}
@@ -1611,9 +1662,12 @@ static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int flags)
{
struct sock *sk = sock->sk;
- struct sk_buff *skb;
+ struct sk_buff *skb, *last;
+ struct sk_buff_head *sk_queue;
int copied;
int err = 0;
+ int off = 0;
+ long timeo;
lock_sock(sk);
/*
@@ -1625,11 +1679,29 @@ static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
goto out;
}
- /* Now we can treat all alike */
- skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
- flags & MSG_DONTWAIT, &err);
- if (skb == NULL)
- goto out;
+ /* We need support for non-blocking reads. */
+ sk_queue = &sk->sk_receive_queue;
+ skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off, &err, &last);
+ /* If no packet is available, release_sock(sk) and try again. */
+ if (!skb) {
+ if (err != -EAGAIN)
+ goto out;
+ release_sock(sk);
+ timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+ while (timeo && !__skb_wait_for_more_packets(sk, sk_queue, &err,
+ &timeo, last)) {
+ skb = __skb_try_recv_datagram(sk, sk_queue, flags, &off,
+ &err, &last);
+ if (skb)
+ break;
+
+ if (err != -EAGAIN)
+ goto done;
+ }
+ if (!skb)
+ goto done;
+ lock_sock(sk);
+ }
if (!sk_to_ax25(sk)->pidincl)
skb_pull(skb, 1); /* Remove PID */
@@ -1676,6 +1748,7 @@ static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
out:
release_sock(sk);
+done:
return err;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.