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authorXie He <xie.he.0141@gmail.com>2020-12-09 09:16:04 +0100
committerDavid S. Miller <davem@davemloft.net>2020-12-10 04:34:25 +0100
commit6b21c0bb3a323c796a620db317db64ea4d787be3 (patch)
treeb148dc7b5646654235eefa3bd45022b404dcf19a /net/x25
parentMerge branch 'mptcp-fixes' (diff)
downloadlinux-6b21c0bb3a323c796a620db317db64ea4d787be3.tar.xz
linux-6b21c0bb3a323c796a620db317db64ea4d787be3.zip
net: x25: Fix handling of Restart Request and Restart Confirmation
1. When the x25 module gets loaded, layer 2 may already be running and connected. In this case, although we are in X25_LINK_STATE_0, we still need to handle the Restart Request received, rather than ignore it. 2. When we are in X25_LINK_STATE_2, we have already sent a Restart Request and is waiting for the Restart Confirmation with t20timer. t20timer will restart itself repeatedly forever so it will always be there, as long as we are in State 2. So we don't need to check x25_t20timer_pending again. Fixes: d023b2b9ccc2 ("net/x25: fix restart request/confirm handling") Cc: Martin Schiller <ms@dev.tdt.de> Signed-off-by: Xie He <xie.he.0141@gmail.com> Acked-by: Martin Schiller <ms@dev.tdt.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/x25')
-rw-r--r--net/x25/x25_link.c25
1 files changed, 9 insertions, 16 deletions
diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index f92073f3cb11..57a81100c5da 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.
*/
@@ -70,17 +65,20 @@ 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:
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:
- confirm = !x25_t20timer_pending(nb);
x25_stop_t20timer(nb);
nb->state = X25_LINK_STATE_3;
- if (confirm)
- x25_transmit_restart_confirmation(nb);
break;
case X25_LINK_STATE_3:
/* clear existing virtual calls */
@@ -94,13 +92,8 @@ void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
case X25_RESTART_CONFIRMATION:
switch (nb->state) {
case X25_LINK_STATE_2:
- if (x25_t20timer_pending(nb)) {
- x25_stop_t20timer(nb);
- nb->state = X25_LINK_STATE_3;
- } else {
- x25_transmit_restart_request(nb);
- x25_start_t20timer(nb);
- }
+ x25_stop_t20timer(nb);
+ nb->state = X25_LINK_STATE_3;
break;
case X25_LINK_STATE_3:
/* clear existing virtual calls */