Subject: [PATCH] net: LLC: Convert timers to use timer_setup()

From: Kees Cook <[email-masked]>
Date: Tue, 24 Oct 2017 01:45:48 -0700

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: "David S. Miller" <[email-masked]>
Cc: Eric Dumazet <[email-masked]>
Cc: Hans Liljestrand <[email-masked]>
Cc: "Paul E. McKenney" <[email-masked]>
Cc: "Reshetova, Elena" <[email-masked]>
Cc: [email-masked]
Signed-off-by: Kees Cook <[email-masked]>
---
 include/net/llc_c_ac.h |  8 ++++----
 net/llc/llc_c_ac.c     | 27 +++++++++++++++++----------
 net/llc/llc_conn.c     | 12 ++++--------
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/include/net/llc_c_ac.h b/include/net/llc_c_ac.h
index f3be818e73c1..e766300b3e99 100644
--- a/include/net/llc_c_ac.h
+++ b/include/net/llc_c_ac.h
@@ -171,10 +171,10 @@ int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct sk_buff *skb);
 int llc_conn_ac_send_i_rsp_as_ack(struct sock *sk, struct sk_buff *skb);
 int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb);
 
-void llc_conn_busy_tmr_cb(unsigned long timeout_data);
-void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data);
-void llc_conn_ack_tmr_cb(unsigned long timeout_data);
-void llc_conn_rej_tmr_cb(unsigned long timeout_data);
+void llc_conn_busy_tmr_cb(struct timer_list *t);
+void llc_conn_pf_cycle_tmr_cb(struct timer_list *t);
+void llc_conn_ack_tmr_cb(struct timer_list *t);
+void llc_conn_rej_tmr_cb(struct timer_list *t);
 
 void llc_conn_set_p_flag(struct sock *sk, u8 value);
 #endif /* LLC_C_AC_H */
diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index ea225bd2672c..f59648018060 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -1318,9 +1318,8 @@ static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
 	return 0;
 }
 
-static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
+static void llc_conn_tmr_common_cb(struct sock *sk, u8 type)
 {
-	struct sock *sk = (struct sock *)timeout_data;
 	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
 	bh_lock_sock(sk);
@@ -1334,24 +1333,32 @@ static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
 	bh_unlock_sock(sk);
 }
 
-void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
+void llc_conn_pf_cycle_tmr_cb(struct timer_list *t)
 {
-	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR);
+	struct llc_sock *llc = from_timer(llc, t, pf_cycle_timer.timer);
+
+	llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_P_TMR);
 }
 
-void llc_conn_busy_tmr_cb(unsigned long timeout_data)
+void llc_conn_busy_tmr_cb(struct timer_list *t)
 {
-	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR);
+	struct llc_sock *llc = from_timer(llc, t, busy_state_timer.timer);
+
+	llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_BUSY_TMR);
 }
 
-void llc_conn_ack_tmr_cb(unsigned long timeout_data)
+void llc_conn_ack_tmr_cb(struct timer_list *t)
 {
-	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR);
+	struct llc_sock *llc = from_timer(llc, t, ack_timer.timer);
+
+	llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_ACK_TMR);
 }
 
-void llc_conn_rej_tmr_cb(unsigned long timeout_data)
+void llc_conn_rej_tmr_cb(struct timer_list *t)
 {
-	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR);
+	struct llc_sock *llc = from_timer(llc, t, rej_sent_timer.timer);
+
+	llc_conn_tmr_common_cb(&llc->sk, LLC_CONN_EV_TYPE_REJ_TMR);
 }
 
 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 5e91b47f0d2a..9177dbb16dce 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -902,20 +902,16 @@ static void llc_sk_init(struct sock *sk)
 	llc->inc_cntr = llc->dec_cntr = 2;
 	llc->dec_step = llc->connect_step = 1;
 
-	setup_timer(&llc->ack_timer.timer, llc_conn_ack_tmr_cb,
-			(unsigned long)sk);
+	timer_setup(&llc->ack_timer.timer, llc_conn_ack_tmr_cb, 0);
 	llc->ack_timer.expire	      = sysctl_llc2_ack_timeout;
 
-	setup_timer(&llc->pf_cycle_timer.timer, llc_conn_pf_cycle_tmr_cb,
-			(unsigned long)sk);
+	timer_setup(&llc->pf_cycle_timer.timer, llc_conn_pf_cycle_tmr_cb, 0);
 	llc->pf_cycle_timer.expire	   = sysctl_llc2_p_timeout;
 
-	setup_timer(&llc->rej_sent_timer.timer, llc_conn_rej_tmr_cb,
-			(unsigned long)sk);
+	timer_setup(&llc->rej_sent_timer.timer, llc_conn_rej_tmr_cb, 0);
 	llc->rej_sent_timer.expire	   = sysctl_llc2_rej_timeout;
 
-	setup_timer(&llc->busy_state_timer.timer, llc_conn_busy_tmr_cb,
-			(unsigned long)sk);
+	timer_setup(&llc->busy_state_timer.timer, llc_conn_busy_tmr_cb, 0);
 	llc->busy_state_timer.expire	     = sysctl_llc2_busy_timeout;
 
 	llc->n2 = 2;   /* max retransmit */
-- 
2.7.4

-- 
Kees Cook
Pixel Security