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-rw-r--r--net/x25/Kconfig8
-rw-r--r--net/x25/af_x25.c82
-rw-r--r--net/x25/x25_dev.c17
-rw-r--r--net/x25/x25_facilities.c2
-rw-r--r--net/x25/x25_forward.c20
-rw-r--r--net/x25/x25_in.c4
-rw-r--r--net/x25/x25_link.c59
-rw-r--r--net/x25/x25_proc.c3
-rw-r--r--net/x25/x25_route.c27
-rw-r--r--net/x25/x25_subr.c6
10 files changed, 107 insertions, 121 deletions
diff --git a/net/x25/Kconfig b/net/x25/Kconfig
index 2ecb2e5e241e..68729aa3a5d5 100644
--- a/net/x25/Kconfig
+++ b/net/x25/Kconfig
@@ -5,7 +5,7 @@
config X25
tristate "CCITT X.25 Packet Layer"
- ---help---
+ help
X.25 is a set of standardized network protocols, similar in scope to
frame relay; the one physical line from your box to the X.25 network
entry point can carry several logical point-to-point connections
@@ -17,11 +17,11 @@ config X25
if you want that) and the lower level data link layer protocol LAPB
(say Y to "LAPB Data Link Driver" below if you want that).
- You can read more about X.25 at <http://www.sangoma.com/tutorials/x25/> and
+ You can read more about X.25 at <https://www.sangoma.com/tutorials/x25/> and
<http://docwiki.cisco.com/wiki/X.25>.
Information about X.25 for Linux is contained in the files
- <file:Documentation/networking/x25.txt> and
- <file:Documentation/networking/x25-iface.txt>.
+ <file:Documentation/networking/x25.rst> and
+ <file:Documentation/networking/x25-iface.rst>.
One connects to an X.25 network either with a dedicated network card
using the X.21 protocol (not yet supported by Linux) or one can do
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index d5b09bbff375..3b55502b2965 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -200,22 +200,6 @@ static void x25_remove_socket(struct sock *sk)
}
/*
- * Kill all bound sockets on a dropped device.
- */
-static void x25_kill_by_device(struct net_device *dev)
-{
- struct sock *s;
-
- write_lock_bh(&x25_list_lock);
-
- sk_for_each(s, &x25_list)
- if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
- x25_disconnect(s, ENETUNREACH, 0, 0);
-
- write_unlock_bh(&x25_list_lock);
-}
-
-/*
* Handle device status changes.
*/
static int x25_device_event(struct notifier_block *this, unsigned long event,
@@ -227,27 +211,33 @@ static int x25_device_event(struct notifier_block *this, unsigned long event,
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
- if (dev->type == ARPHRD_X25
-#if IS_ENABLED(CONFIG_LLC)
- || dev->type == ARPHRD_ETHER
-#endif
- ) {
+ if (dev->type == ARPHRD_X25) {
switch (event) {
- case NETDEV_UP:
+ case NETDEV_REGISTER:
+ case NETDEV_POST_TYPE_CHANGE:
x25_link_device_up(dev);
break;
- case NETDEV_GOING_DOWN:
+ case NETDEV_DOWN:
nb = x25_get_neigh(dev);
if (nb) {
- x25_terminate_link(nb);
+ x25_link_terminated(nb);
x25_neigh_put(nb);
}
- break;
- case NETDEV_DOWN:
- x25_kill_by_device(dev);
x25_route_device_down(dev);
+ break;
+ case NETDEV_PRE_TYPE_CHANGE:
+ case NETDEV_UNREGISTER:
x25_link_device_down(dev);
break;
+ case NETDEV_CHANGE:
+ if (!netif_carrier_ok(dev)) {
+ nb = x25_get_neigh(dev);
+ if (nb) {
+ x25_link_terminated(nb);
+ x25_neigh_put(nb);
+ }
+ }
+ break;
}
}
@@ -376,7 +366,7 @@ static void x25_destroy_timer(struct timer_list *t)
/*
* This is called from user mode and the timers. Thus it protects itself
- * against interrupt users but doesn't worry about being called during
+ * against interrupting users but doesn't worry about being called during
* work. Once it is removed from the queue no interrupt or bottom half
* will touch it and we are (fairly 8-) ) safe.
* Not static as it's used by the timer
@@ -431,7 +421,7 @@ void x25_destroy_socket_from_timer(struct sock *sk)
*/
static int x25_setsockopt(struct socket *sock, int level, int optname,
- char __user *optval, unsigned int optlen)
+ sockptr_t optval, unsigned int optlen)
{
int opt;
struct sock *sk = sock->sk;
@@ -445,7 +435,7 @@ static int x25_setsockopt(struct socket *sock, int level, int optname,
goto out;
rc = -EFAULT;
- if (get_user(opt, (int __user *)optval))
+ if (copy_from_sockptr(&opt, optval, sizeof(int)))
goto out;
if (opt)
@@ -546,7 +536,7 @@ static int x25_create(struct net *net, struct socket *sock, int protocol,
if (protocol)
goto out;
- rc = -ENOBUFS;
+ rc = -ENOMEM;
if ((sk = x25_alloc_socket(net, kern)) == NULL)
goto out;
@@ -681,7 +671,8 @@ static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
int len, i, rc = 0;
if (addr_len != sizeof(struct sockaddr_x25) ||
- addr->sx25_family != AF_X25) {
+ addr->sx25_family != AF_X25 ||
+ strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
rc = -EINVAL;
goto out;
}
@@ -728,6 +719,11 @@ static int x25_wait_for_connection_establishment(struct sock *sk)
sk->sk_socket->state = SS_UNCONNECTED;
break;
}
+ rc = -ENOTCONN;
+ if (sk->sk_state == TCP_CLOSE) {
+ sk->sk_socket->state = SS_UNCONNECTED;
+ break;
+ }
rc = 0;
if (sk->sk_state != TCP_ESTABLISHED) {
release_sock(sk);
@@ -775,7 +771,8 @@ static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
rc = -EINVAL;
if (addr_len != sizeof(struct sockaddr_x25) ||
- addr->sx25_family != AF_X25)
+ addr->sx25_family != AF_X25 ||
+ strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
goto out;
rc = -ENETUNREACH;
@@ -825,7 +822,7 @@ static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
sock->state = SS_CONNECTED;
rc = 0;
out_put_neigh:
- if (rc) {
+ if (rc && x25->neighbour) {
read_lock_bh(&x25_list_lock);
x25_neigh_put(x25->neighbour);
x25->neighbour = NULL;
@@ -1026,7 +1023,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
/*
* current neighbour/link might impose additional limits
- * on certain facilties
+ * on certain facilities
*/
x25_limit_facilities(&facilities, nb);
@@ -1050,6 +1047,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
makex25->lci = lci;
makex25->dest_addr = dest_addr;
makex25->source_addr = source_addr;
+ x25_neigh_hold(nb);
makex25->neighbour = nb;
makex25->facilities = facilities;
makex25->dte_facilities= dte_facilities;
@@ -1322,8 +1320,7 @@ static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
} else {
/* Now we can treat all alike */
release_sock(sk);
- skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
- flags & MSG_DONTWAIT, &rc);
+ skb = skb_recv_datagram(sk, flags, &rc);
lock_sock(sk);
if (!skb)
goto out;
@@ -1772,10 +1769,15 @@ void x25_kill_by_neigh(struct x25_neigh *nb)
write_lock_bh(&x25_list_lock);
- sk_for_each(s, &x25_list)
- if (x25_sk(s)->neighbour == nb)
+ sk_for_each(s, &x25_list) {
+ if (x25_sk(s)->neighbour == nb) {
+ write_unlock_bh(&x25_list_lock);
+ lock_sock(s);
x25_disconnect(s, ENETUNREACH, 0, 0);
-
+ release_sock(s);
+ write_lock_bh(&x25_list_lock);
+ }
+ }
write_unlock_bh(&x25_list_lock);
/* Remove any related forwards */
diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
index 00e782335cb0..5259ef8f5242 100644
--- a/net/x25/x25_dev.c
+++ b/net/x25/x25_dev.c
@@ -115,8 +115,10 @@ int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev,
goto drop;
}
- if (!pskb_may_pull(skb, 1))
+ if (!pskb_may_pull(skb, 1)) {
+ x25_neigh_put(nb);
return 0;
+ }
switch (skb->data[0]) {
@@ -158,10 +160,6 @@ void x25_establish_link(struct x25_neigh *nb)
*ptr = X25_IFACE_CONNECT;
break;
-#if IS_ENABLED(CONFIG_LLC)
- case ARPHRD_ETHER:
- return;
-#endif
default:
return;
}
@@ -177,10 +175,6 @@ void x25_terminate_link(struct x25_neigh *nb)
struct sk_buff *skb;
unsigned char *ptr;
-#if IS_ENABLED(CONFIG_LLC)
- if (nb->dev->type == ARPHRD_ETHER)
- return;
-#endif
if (nb->dev->type != ARPHRD_X25)
return;
@@ -210,11 +204,6 @@ void x25_send_frame(struct sk_buff *skb, struct x25_neigh *nb)
*dptr = X25_IFACE_DATA;
break;
-#if IS_ENABLED(CONFIG_LLC)
- case ARPHRD_ETHER:
- kfree_skb(skb);
- return;
-#endif
default:
kfree_skb(skb);
return;
diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
index 7fb327632272..8e1a49b0c0dc 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -98,7 +98,7 @@ int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
*vc_fac_mask |= X25_MASK_REVERSE;
break;
}
- /*fall through */
+ fallthrough;
case X25_FAC_THROUGHPUT:
facilities->throughput = p[1];
*vc_fac_mask |= X25_MASK_THROUGHPUT;
diff --git a/net/x25/x25_forward.c b/net/x25/x25_forward.c
index c82999941d3f..21b30b56e889 100644
--- a/net/x25/x25_forward.c
+++ b/net/x25/x25_forward.c
@@ -19,7 +19,6 @@ int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
{
struct x25_route *rt;
struct x25_neigh *neigh_new = NULL;
- struct list_head *entry;
struct x25_forward *x25_frwd, *new_frwd;
struct sk_buff *skbn;
short same_lci = 0;
@@ -46,8 +45,7 @@ int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
* established LCI? It shouldn't happen, just in case..
*/
read_lock_bh(&x25_forward_list_lock);
- list_for_each(entry, &x25_forward_list) {
- x25_frwd = list_entry(entry, struct x25_forward, node);
+ list_for_each_entry(x25_frwd, &x25_forward_list, node) {
if (x25_frwd->lci == lci) {
pr_warn("call request for lci which is already registered!, transmitting but not registering new pair\n");
same_lci = 1;
@@ -92,15 +90,13 @@ out_no_route:
int x25_forward_data(int lci, struct x25_neigh *from, struct sk_buff *skb) {
struct x25_forward *frwd;
- struct list_head *entry;
struct net_device *peer = NULL;
struct x25_neigh *nb;
struct sk_buff *skbn;
int rc = 0;
read_lock_bh(&x25_forward_list_lock);
- list_for_each(entry, &x25_forward_list) {
- frwd = list_entry(entry, struct x25_forward, node);
+ list_for_each_entry(frwd, &x25_forward_list, node) {
if (frwd->lci == lci) {
/* The call is established, either side can send */
if (from->dev == frwd->dev1) {
@@ -131,13 +127,11 @@ out:
void x25_clear_forward_by_lci(unsigned int lci)
{
- struct x25_forward *fwd;
- struct list_head *entry, *tmp;
+ struct x25_forward *fwd, *tmp;
write_lock_bh(&x25_forward_list_lock);
- list_for_each_safe(entry, tmp, &x25_forward_list) {
- fwd = list_entry(entry, struct x25_forward, node);
+ list_for_each_entry_safe(fwd, tmp, &x25_forward_list, node) {
if (fwd->lci == lci) {
list_del(&fwd->node);
kfree(fwd);
@@ -149,13 +143,11 @@ void x25_clear_forward_by_lci(unsigned int lci)
void x25_clear_forward_by_dev(struct net_device *dev)
{
- struct x25_forward *fwd;
- struct list_head *entry, *tmp;
+ struct x25_forward *fwd, *tmp;
write_lock_bh(&x25_forward_list_lock);
- list_for_each_safe(entry, tmp, &x25_forward_list) {
- fwd = list_entry(entry, struct x25_forward, node);
+ list_for_each_entry_safe(fwd, tmp, &x25_forward_list, node) {
if ((fwd->dev1 == dev) || (fwd->dev2 == dev)){
list_del(&fwd->node);
kfree(fwd);
diff --git a/net/x25/x25_in.c b/net/x25/x25_in.c
index 4d3bb46aaae0..b981a4828d08 100644
--- a/net/x25/x25_in.c
+++ b/net/x25/x25_in.c
@@ -41,7 +41,7 @@ static int x25_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
return 0;
}
- if (!more && x25->fraglen > 0) { /* End of fragment */
+ if (x25->fraglen > 0) { /* End of fragment */
int len = x25->fraglen + skb->len;
if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL){
@@ -349,7 +349,7 @@ static int x25_state4_machine(struct sock *sk, struct sk_buff *skb, int frametyp
case X25_RESET_REQUEST:
x25_write_internal(sk, X25_RESET_CONFIRMATION);
- /* fall through */
+ fallthrough;
case X25_RESET_CONFIRMATION: {
x25_stop_timer(sk);
x25->condition = 0x00;
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index 7d02532aad0d..5460b9146dd8 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -58,11 +58,6 @@ static inline void x25_stop_t20timer(struct x25_neigh *nb)
del_timer(&nb->t20timer);
}
-static inline int x25_t20timer_pending(struct x25_neigh *nb)
-{
- return timer_pending(&nb->t20timer);
-}
-
/*
* This handles all restart and diagnostic frames.
*/
@@ -70,20 +65,45 @@ void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
unsigned short frametype)
{
struct sk_buff *skbn;
- int confirm;
switch (frametype) {
case X25_RESTART_REQUEST:
- confirm = !x25_t20timer_pending(nb);
- x25_stop_t20timer(nb);
- nb->state = X25_LINK_STATE_3;
- if (confirm)
+ switch (nb->state) {
+ case X25_LINK_STATE_0:
+ /* This can happen when the x25 module just gets loaded
+ * and doesn't know layer 2 has already connected
+ */
+ nb->state = X25_LINK_STATE_3;
+ x25_transmit_restart_confirmation(nb);
+ break;
+ case X25_LINK_STATE_2:
+ x25_stop_t20timer(nb);
+ nb->state = X25_LINK_STATE_3;
+ break;
+ case X25_LINK_STATE_3:
+ /* clear existing virtual calls */
+ x25_kill_by_neigh(nb);
+
x25_transmit_restart_confirmation(nb);
+ break;
+ }
break;
case X25_RESTART_CONFIRMATION:
- x25_stop_t20timer(nb);
- nb->state = X25_LINK_STATE_3;
+ switch (nb->state) {
+ case X25_LINK_STATE_2:
+ x25_stop_t20timer(nb);
+ nb->state = X25_LINK_STATE_3;
+ break;
+ case X25_LINK_STATE_3:
+ /* clear existing virtual calls */
+ x25_kill_by_neigh(nb);
+
+ x25_transmit_restart_request(nb);
+ nb->state = X25_LINK_STATE_2;
+ x25_start_t20timer(nb);
+ break;
+ }
break;
case X25_DIAGNOSTIC:
@@ -214,8 +234,6 @@ void x25_link_established(struct x25_neigh *nb)
{
switch (nb->state) {
case X25_LINK_STATE_0:
- nb->state = X25_LINK_STATE_2;
- break;
case X25_LINK_STATE_1:
x25_transmit_restart_request(nb);
nb->state = X25_LINK_STATE_2;
@@ -232,6 +250,9 @@ void x25_link_established(struct x25_neigh *nb)
void x25_link_terminated(struct x25_neigh *nb)
{
nb->state = X25_LINK_STATE_0;
+ skb_queue_purge(&nb->queue);
+ x25_stop_t20timer(nb);
+
/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
x25_kill_by_neigh(nb);
}
@@ -270,16 +291,13 @@ void x25_link_device_up(struct net_device *dev)
/**
* __x25_remove_neigh - remove neighbour from x25_neigh_list
- * @nb - neigh to remove
+ * @nb: - neigh to remove
*
* Remove neighbour from x25_neigh_list. If it was there.
* Caller must hold x25_neigh_list_lock.
*/
static void __x25_remove_neigh(struct x25_neigh *nb)
{
- skb_queue_purge(&nb->queue);
- x25_stop_t20timer(nb);
-
if (nb->node.next) {
list_del(&nb->node);
x25_neigh_put(nb);
@@ -314,12 +332,9 @@ void x25_link_device_down(struct net_device *dev)
struct x25_neigh *x25_get_neigh(struct net_device *dev)
{
struct x25_neigh *nb, *use = NULL;
- struct list_head *entry;
read_lock_bh(&x25_neigh_list_lock);
- list_for_each(entry, &x25_neigh_list) {
- nb = list_entry(entry, struct x25_neigh, node);
-
+ list_for_each_entry(nb, &x25_neigh_list, node) {
if (nb->dev == dev) {
use = nb;
break;
diff --git a/net/x25/x25_proc.c b/net/x25/x25_proc.c
index 3bddcbdf2e40..0412814a2295 100644
--- a/net/x25/x25_proc.c
+++ b/net/x25/x25_proc.c
@@ -79,7 +79,6 @@ static int x25_seq_socket_show(struct seq_file *seq, void *v)
{
struct sock *s;
struct x25_sock *x25;
- struct net_device *dev;
const char *devname;
if (v == SEQ_START_TOKEN) {
@@ -91,7 +90,7 @@ static int x25_seq_socket_show(struct seq_file *seq, void *v)
s = sk_entry(v);
x25 = x25_sk(s);
- if (!x25->neighbour || (dev = x25->neighbour->dev) == NULL)
+ if (!x25->neighbour || !x25->neighbour->dev)
devname = "???";
else
devname = x25->neighbour->dev->name;
diff --git a/net/x25/x25_route.c b/net/x25/x25_route.c
index b8e94d58d0f1..647f325ed867 100644
--- a/net/x25/x25_route.c
+++ b/net/x25/x25_route.c
@@ -27,14 +27,11 @@ static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
struct net_device *dev)
{
struct x25_route *rt;
- struct list_head *entry;
int rc = -EINVAL;
write_lock_bh(&x25_route_list_lock);
- list_for_each(entry, &x25_route_list) {
- rt = list_entry(entry, struct x25_route, node);
-
+ list_for_each_entry(rt, &x25_route_list, node) {
if (!memcmp(&rt->address, address, sigdigits) &&
rt->sigdigits == sigdigits)
goto out;
@@ -78,14 +75,11 @@ static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
struct net_device *dev)
{
struct x25_route *rt;
- struct list_head *entry;
int rc = -EINVAL;
write_lock_bh(&x25_route_list_lock);
- list_for_each(entry, &x25_route_list) {
- rt = list_entry(entry, struct x25_route, node);
-
+ list_for_each_entry(rt, &x25_route_list, node) {
if (!memcmp(&rt->address, address, sigdigits) &&
rt->sigdigits == sigdigits && rt->dev == dev) {
__x25_remove_route(rt);
@@ -115,9 +109,6 @@ void x25_route_device_down(struct net_device *dev)
__x25_remove_route(rt);
}
write_unlock_bh(&x25_route_list_lock);
-
- /* Remove any related forwarding */
- x25_clear_forward_by_dev(dev);
}
/*
@@ -127,12 +118,7 @@ struct net_device *x25_dev_get(char *devname)
{
struct net_device *dev = dev_get_by_name(&init_net, devname);
- if (dev &&
- (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
-#if IS_ENABLED(CONFIG_LLC)
- && dev->type != ARPHRD_ETHER
-#endif
- ))){
+ if (dev && (!(dev->flags & IFF_UP) || dev->type != ARPHRD_X25)) {
dev_put(dev);
dev = NULL;
}
@@ -142,20 +128,17 @@ struct net_device *x25_dev_get(char *devname)
/**
* x25_get_route - Find a route given an X.25 address.
- * @addr - address to find a route for
+ * @addr: - address to find a route for
*
* Find a route given an X.25 address.
*/
struct x25_route *x25_get_route(struct x25_address *addr)
{
struct x25_route *rt, *use = NULL;
- struct list_head *entry;
read_lock_bh(&x25_route_list_lock);
- list_for_each(entry, &x25_route_list) {
- rt = list_entry(entry, struct x25_route, node);
-
+ list_for_each_entry(rt, &x25_route_list, node) {
if (!memcmp(&rt->address, addr, rt->sigdigits)) {
if (!use)
use = rt;
diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c
index 8aa415a38814..0285aaa1e93c 100644
--- a/net/x25/x25_subr.c
+++ b/net/x25/x25_subr.c
@@ -357,6 +357,12 @@ void x25_disconnect(struct sock *sk, int reason, unsigned char cause,
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
}
+ if (x25->neighbour) {
+ read_lock_bh(&x25_list_lock);
+ x25_neigh_put(x25->neighbour);
+ x25->neighbour = NULL;
+ read_unlock_bh(&x25_list_lock);
+ }
}
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.