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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/ipv4/tcp_metrics.c
..
..
@@ -40,7 +40,7 @@
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40
 
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 struct tcp_metrics_block {
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 	struct tcp_metrics_block __rcu	*tcpm_next;
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-	possible_net_t			tcpm_net;
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+	struct net			*tcpm_net;
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 	struct inetpeer_addr		tcpm_saddr;
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 	struct inetpeer_addr		tcpm_daddr;
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 	unsigned long			tcpm_stamp;
..
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@@ -51,34 +51,38 @@
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 	struct rcu_head			rcu_head;
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 };
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53
 
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-static inline struct net *tm_net(struct tcp_metrics_block *tm)
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+static inline struct net *tm_net(const struct tcp_metrics_block *tm)
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 {
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-	return read_pnet(&tm->tcpm_net);
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+	/* Paired with the WRITE_ONCE() in tcpm_new() */
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+	return READ_ONCE(tm->tcpm_net);
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 }
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59
 
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 static bool tcp_metric_locked(struct tcp_metrics_block *tm,
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 			      enum tcp_metric_index idx)
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 {
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-	return tm->tcpm_lock & (1 << idx);
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+	/* Paired with WRITE_ONCE() in tcpm_suck_dst() */
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+	return READ_ONCE(tm->tcpm_lock) & (1 << idx);
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 }
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-static u32 tcp_metric_get(struct tcp_metrics_block *tm,
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+static u32 tcp_metric_get(const struct tcp_metrics_block *tm,
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 			  enum tcp_metric_index idx)
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 {
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-	return tm->tcpm_vals[idx];
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+	/* Paired with WRITE_ONCE() in tcp_metric_set() */
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+	return READ_ONCE(tm->tcpm_vals[idx]);
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 }
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73
 
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 static void tcp_metric_set(struct tcp_metrics_block *tm,
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 			   enum tcp_metric_index idx,
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 			   u32 val)
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 {
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-	tm->tcpm_vals[idx] = val;
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+	/* Paired with READ_ONCE() in tcp_metric_get() */
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+	WRITE_ONCE(tm->tcpm_vals[idx], val);
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80
 }
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81
 
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 static bool addr_same(const struct inetpeer_addr *a,
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 		      const struct inetpeer_addr *b)
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 {
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-	return inetpeer_addr_cmp(a, b) == 0;
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+	return (a->family == b->family) && !inetpeer_addr_cmp(a, b);
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86
 }
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87
 
84
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 struct tcpm_hash_bucket {
..
..
@@ -89,6 +93,7 @@
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 static unsigned int		tcp_metrics_hash_log __read_mostly;
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94
 
91
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 static DEFINE_SPINLOCK(tcp_metrics_lock);
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+static DEFINE_SEQLOCK(fastopen_seqlock);
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97
 
93
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 static void tcpm_suck_dst(struct tcp_metrics_block *tm,
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99
 			  const struct dst_entry *dst,
..
..
@@ -97,7 +102,7 @@
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102
 	u32 msval;
98
103
 	u32 val;
99
104
 
100
-	tm->tcpm_stamp = jiffies;
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+	WRITE_ONCE(tm->tcpm_stamp, jiffies);
101
106
 
102
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 	val = 0;
103
108
 	if (dst_metric_locked(dst, RTAX_RTT))
..
..
@@ -110,30 +115,42 @@
110
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 		val |= 1 << TCP_METRIC_CWND;
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116
 	if (dst_metric_locked(dst, RTAX_REORDERING))
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117
 		val |= 1 << TCP_METRIC_REORDERING;
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-	tm->tcpm_lock = val;
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+	/* Paired with READ_ONCE() in tcp_metric_locked() */
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+	WRITE_ONCE(tm->tcpm_lock, val);
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120
 
115
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 	msval = dst_metric_raw(dst, RTAX_RTT);
116
-	tm->tcpm_vals[TCP_METRIC_RTT] = msval * USEC_PER_MSEC;
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+	tcp_metric_set(tm, TCP_METRIC_RTT, msval * USEC_PER_MSEC);
117
123
 
118
124
 	msval = dst_metric_raw(dst, RTAX_RTTVAR);
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-	tm->tcpm_vals[TCP_METRIC_RTTVAR] = msval * USEC_PER_MSEC;
120
-	tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH);
121
-	tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND);
122
-	tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING);
125
+	tcp_metric_set(tm, TCP_METRIC_RTTVAR, msval * USEC_PER_MSEC);
126
+	tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
127
+		       dst_metric_raw(dst, RTAX_SSTHRESH));
128
+	tcp_metric_set(tm, TCP_METRIC_CWND,
129
+		       dst_metric_raw(dst, RTAX_CWND));
130
+	tcp_metric_set(tm, TCP_METRIC_REORDERING,
131
+		       dst_metric_raw(dst, RTAX_REORDERING));
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132
 	if (fastopen_clear) {
133
+		write_seqlock(&fastopen_seqlock);
124
134
 		tm->tcpm_fastopen.mss = 0;
125
135
 		tm->tcpm_fastopen.syn_loss = 0;
126
136
 		tm->tcpm_fastopen.try_exp = 0;
127
137
 		tm->tcpm_fastopen.cookie.exp = false;
128
138
 		tm->tcpm_fastopen.cookie.len = 0;
139
+		write_sequnlock(&fastopen_seqlock);
129
140
 	}
130
141
 }
131
142
 
132
143
 #define TCP_METRICS_TIMEOUT		(60 * 60 * HZ)
133
144
 
134
-static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst)
145
+static void tcpm_check_stamp(struct tcp_metrics_block *tm,
146
+			     const struct dst_entry *dst)
135
147
 {
136
-	if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT)))
148
+	unsigned long limit;
149
+
150
+	if (!tm)
151
+		return;
152
+	limit = READ_ONCE(tm->tcpm_stamp) + TCP_METRICS_TIMEOUT;
153
+	if (unlikely(time_after(jiffies, limit)))
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154
 		tcpm_suck_dst(tm, dst, false);
138
155
 }
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156
 
..
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@@ -174,20 +191,23 @@
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191
 		oldest = deref_locked(tcp_metrics_hash[hash].chain);
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192
 		for (tm = deref_locked(oldest->tcpm_next); tm;
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193
 		     tm = deref_locked(tm->tcpm_next)) {
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-			if (time_before(tm->tcpm_stamp, oldest->tcpm_stamp))
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+			if (time_before(READ_ONCE(tm->tcpm_stamp),
195
+					READ_ONCE(oldest->tcpm_stamp)))
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196
 				oldest = tm;
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 		}
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198
 		tm = oldest;
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199
 	} else {
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-		tm = kmalloc(sizeof(*tm), GFP_ATOMIC);
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+		tm = kzalloc(sizeof(*tm), GFP_ATOMIC);
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201
 		if (!tm)
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202
 			goto out_unlock;
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 	}
186
-	write_pnet(&tm->tcpm_net, net);
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+	/* Paired with the READ_ONCE() in tm_net() */
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+	WRITE_ONCE(tm->tcpm_net, net);
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+
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207
 	tm->tcpm_saddr = *saddr;
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208
 	tm->tcpm_daddr = *daddr;
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209
 
190
-	tcpm_suck_dst(tm, dst, true);
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+	tcpm_suck_dst(tm, dst, reclaim);
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211
 
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 	if (likely(!reclaim)) {
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 		tm->tcpm_next = tcp_metrics_hash[hash].chain;
..
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@@ -434,7 +454,7 @@
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 					       tp->reordering);
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455
 		}
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 	}
437
-	tm->tcpm_stamp = jiffies;
457
+	WRITE_ONCE(tm->tcpm_stamp, jiffies);
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458
 out_unlock:
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 	rcu_read_unlock();
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460
 }
..
..
@@ -538,8 +558,6 @@
538
558
 
539
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 	return ret;
540
560
 }
541
-
542
-static DEFINE_SEQLOCK(fastopen_seqlock);
543
561
 
544
562
 void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
545
563
 			    struct tcp_fastopen_cookie *cookie)
..
..
@@ -647,7 +665,7 @@
647
665
 	}
648
666
 
649
667
 	if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE,
650
-			  jiffies - tm->tcpm_stamp,
668
+			  jiffies - READ_ONCE(tm->tcpm_stamp),
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669
 			  TCP_METRICS_ATTR_PAD) < 0)
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670
 		goto nla_put_failure;
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671
 
..
..
@@ -658,7 +676,7 @@
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676
 		if (!nest)
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 			goto nla_put_failure;
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678
 		for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) {
661
-			u32 val = tm->tcpm_vals[i];
679
+			u32 val = tcp_metric_get(tm, i);
662
680
 
663
681
 			if (!val)
664
682
 				continue;