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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/net/core/sock_reuseport.c
..
..
@@ -16,26 +16,23 @@
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16
 
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 DEFINE_SPINLOCK(reuseport_lock);
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18
 
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-#define REUSEPORT_MIN_ID 1
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 static DEFINE_IDA(reuseport_ida);
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20
 
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-int reuseport_get_id(struct sock_reuseport *reuse)
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+void reuseport_has_conns_set(struct sock *sk)
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 {
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-	int id;
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+	struct sock_reuseport *reuse;
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24
 
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-	if (reuse->reuseport_id)
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-		return reuse->reuseport_id;
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+	if (!rcu_access_pointer(sk->sk_reuseport_cb))
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+		return;
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27
 
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-	id = ida_simple_get(&reuseport_ida, REUSEPORT_MIN_ID, 0,
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-			    /* Called under reuseport_lock */
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-			    GFP_ATOMIC);
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-	if (id < 0)
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-		return id;
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-
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-	reuse->reuseport_id = id;
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-
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-	return reuse->reuseport_id;
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+	spin_lock_bh(&reuseport_lock);
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+	reuse = rcu_dereference_protected(sk->sk_reuseport_cb,
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+					  lockdep_is_held(&reuseport_lock));
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+	if (likely(reuse))
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+		reuse->has_conns = 1;
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+	spin_unlock_bh(&reuseport_lock);
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34
 }
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+EXPORT_SYMBOL(reuseport_has_conns_set);
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36
 
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 static struct sock_reuseport *__reuseport_alloc(unsigned int max_socks)
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 {
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@@ -55,6 +52,7 @@
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 int reuseport_alloc(struct sock *sk, bool bind_inany)
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 {
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 	struct sock_reuseport *reuse;
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+	int id, ret = 0;
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56
 
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 	/* bh lock used since this function call may precede hlist lock in
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 	 * soft irq of receive path or setsockopt from process context
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@@ -78,10 +76,18 @@
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76
 
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 	reuse = __reuseport_alloc(INIT_SOCKS);
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 	if (!reuse) {
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-		spin_unlock_bh(&reuseport_lock);
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-		return -ENOMEM;
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+		ret = -ENOMEM;
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+		goto out;
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 	}
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82
 
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+	id = ida_alloc(&reuseport_ida, GFP_ATOMIC);
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+	if (id < 0) {
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+		kfree(reuse);
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+		ret = id;
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+		goto out;
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+	}
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+
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+	reuse->reuseport_id = id;
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91
 	reuse->socks[0] = sk;
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92
 	reuse->num_socks = 1;
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 	reuse->bind_inany = bind_inany;
..
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@@ -90,7 +96,7 @@
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96
 out:
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 	spin_unlock_bh(&reuseport_lock);
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98
 
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-	return 0;
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+	return ret;
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100
 }
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101
 EXPORT_SYMBOL(reuseport_alloc);
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102
 
..
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@@ -107,7 +113,6 @@
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113
 	if (!more_reuse)
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114
 		return NULL;
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115
 
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-	more_reuse->max_socks = more_socks_size;
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 	more_reuse->num_socks = reuse->num_socks;
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117
 	more_reuse->prog = reuse->prog;
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 	more_reuse->reuseport_id = reuse->reuseport_id;
..
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@@ -136,8 +141,7 @@
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141
 
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142
 	reuse = container_of(head, struct sock_reuseport, rcu);
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143
 	sk_reuseport_prog_free(rcu_dereference_protected(reuse->prog, 1));
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-	if (reuse->reuseport_id)
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-		ida_simple_remove(&reuseport_ida, reuse->reuseport_id);
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+	ida_free(&reuseport_ida, reuse->reuseport_id);
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145
 	kfree(reuse);
142
146
 }
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147
 
..
..
@@ -145,6 +149,8 @@
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149
  *  reuseport_add_sock - Add a socket to the reuseport group of another.
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150
  *  @sk:  New socket to add to the group.
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  *  @sk2: Socket belonging to the existing reuseport group.
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+ *  @bind_inany: Whether or not the group is bound to a local INANY address.
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+ *
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  *  May return ENOMEM and not add socket to group under memory pressure.
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  */
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156
 int reuseport_add_sock(struct sock *sk, struct sock *sk2, bool bind_inany)
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..
@@ -188,6 +194,7 @@
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194
 		call_rcu(&old_reuse->rcu, reuseport_free_rcu);
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195
 	return 0;
190
196
 }
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+EXPORT_SYMBOL(reuseport_add_sock);
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198
 
192
199
 void reuseport_detach_sock(struct sock *sk)
193
200
 {
..
..
@@ -198,12 +205,15 @@
198
205
 	reuse = rcu_dereference_protected(sk->sk_reuseport_cb,
199
206
 					  lockdep_is_held(&reuseport_lock));
200
207
 
201
-	/* At least one of the sk in this reuseport group is added to
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-	 * a bpf map.  Notify the bpf side.  The bpf map logic will
203
-	 * remove the sk if it is indeed added to a bpf map.
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+	/* Notify the bpf side. The sk may be added to a sockarray
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+	 * map. If so, sockarray logic will remove it from the map.
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+	 *
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+	 * Other bpf map types that work with reuseport, like sockmap,
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+	 * don't need an explicit callback from here. They override sk
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+	 * unhash/close ops to remove the sk from the map before we
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+	 * get to this point.
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215
 	 */
205
-	if (reuse->reuseport_id)
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-		bpf_sk_reuseport_detach(sk);
216
+	bpf_sk_reuseport_detach(sk);
207
217
 
208
218
 	rcu_assign_pointer(sk->sk_reuseport_cb, NULL);
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219
 
..
..
@@ -341,3 +351,27 @@
341
351
 	return 0;
342
352
 }
343
353
 EXPORT_SYMBOL(reuseport_attach_prog);
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+
355
+int reuseport_detach_prog(struct sock *sk)
356
+{
357
+	struct sock_reuseport *reuse;
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+	struct bpf_prog *old_prog;
359
+
360
+	if (!rcu_access_pointer(sk->sk_reuseport_cb))
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+		return sk->sk_reuseport ? -ENOENT : -EINVAL;
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+
363
+	old_prog = NULL;
364
+	spin_lock_bh(&reuseport_lock);
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+	reuse = rcu_dereference_protected(sk->sk_reuseport_cb,
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+					  lockdep_is_held(&reuseport_lock));
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+	old_prog = rcu_replace_pointer(reuse->prog, old_prog,
368
+				       lockdep_is_held(&reuseport_lock));
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+	spin_unlock_bh(&reuseport_lock);
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+
371
+	if (!old_prog)
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+		return -ENOENT;
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+
374
+	sk_reuseport_prog_free(old_prog);
375
+	return 0;
376
+}
377
+EXPORT_SYMBOL(reuseport_detach_prog);