net: dccp: Convert timers to use timer_setup()

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. Adds a pointer back to the sock.

Cc: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: dccp@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 13 insertions, 10 deletions

diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index e1295d5..1c75cd1 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -126,10 +126,10 @@ static void ccid2_change_l_seq_window(struct sock *sk, u64 val)
 						  DCCPF_SEQ_WMAX));
 }
 
-static void ccid2_hc_tx_rto_expire(unsigned long data)
+static void ccid2_hc_tx_rto_expire(struct timer_list *t)
 {
-	struct sock *sk = (struct sock *)data;
-	struct ccid2_hc_tx_sock *hc = ccid2_hc_tx_sk(sk);
+	struct ccid2_hc_tx_sock *hc = from_timer(hc, t, tx_rtotimer);
+	struct sock *sk = hc->sk;
 	const bool sender_was_blocked = ccid2_cwnd_network_limited(hc);
 
 	bh_lock_sock(sk);
@@ -733,8 +733,8 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
 	hc->tx_rpdupack  = -1;
 	hc->tx_last_cong = hc->tx_lsndtime = hc->tx_cwnd_stamp = ccid2_jiffies32;
 	hc->tx_cwnd_used = 0;
-	setup_timer(&hc->tx_rtotimer, ccid2_hc_tx_rto_expire,
-			(unsigned long)sk);
+	hc->sk		 = sk;
+	timer_setup(&hc->tx_rtotimer, ccid2_hc_tx_rto_expire, 0);
 	INIT_LIST_HEAD(&hc->tx_av_chunks);
 	return 0;
 }
diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index 6e50ef2..1af0116 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -85,6 +85,7 @@ struct ccid2_hc_tx_sock {
 				tx_rto;
 	u64			tx_rtt_seq:48;
 	struct timer_list	tx_rtotimer;
+	struct sock		*sk;
 
 	/* Congestion Window validation (optional, RFC 2861) */
 	u32			tx_cwnd_used,
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 119c043..8b5ba6d 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -195,10 +195,10 @@ static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hc,
 	}
 }
 
-static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
+static void ccid3_hc_tx_no_feedback_timer(struct timer_list *t)
 {
-	struct sock *sk = (struct sock *)data;
-	struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
+	struct ccid3_hc_tx_sock *hc = from_timer(hc, t, tx_no_feedback_timer);
+	struct sock *sk = hc->sk;
 	unsigned long t_nfb = USEC_PER_SEC / 5;
 
 	bh_lock_sock(sk);
@@ -505,8 +505,9 @@ static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
 
 	hc->tx_state = TFRC_SSTATE_NO_SENT;
 	hc->tx_hist  = NULL;
-	setup_timer(&hc->tx_no_feedback_timer,
-			ccid3_hc_tx_no_feedback_timer, (unsigned long)sk);
+	hc->sk	     = sk;
+	timer_setup(&hc->tx_no_feedback_timer,
+		    ccid3_hc_tx_no_feedback_timer, 0);
 	return 0;
 }
 
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 1a9933c..813d91c 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -106,6 +106,7 @@ struct ccid3_hc_tx_sock {
 	u8				tx_last_win_count;
 	ktime_t				tx_t_last_win_count;
 	struct timer_list		tx_no_feedback_timer;
+	struct sock			*sk;
 	ktime_t				tx_t_ld;
 	ktime_t				tx_t_nom;
 	struct tfrc_tx_hist_entry	*tx_hist;