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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/kernel/bpf/reuseport_array.c
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@@ -20,11 +20,14 @@
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 /* The caller must hold the reuseport_lock */
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 void bpf_sk_reuseport_detach(struct sock *sk)
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 {
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-	struct sock __rcu **socks;
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+	uintptr_t sk_user_data;
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24
 
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 	write_lock_bh(&sk->sk_callback_lock);
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-	socks = sk->sk_user_data;
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-	if (socks) {
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+	sk_user_data = (uintptr_t)sk->sk_user_data;
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+	if (sk_user_data & SK_USER_DATA_BPF) {
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+		struct sock __rcu **socks;
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+
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+		socks = (void *)(sk_user_data & SK_USER_DATA_PTRMASK);
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 		WRITE_ONCE(sk->sk_user_data, NULL);
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 		/*
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 		 * Do not move this NULL assignment outside of
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@@ -96,8 +99,6 @@
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 	struct sock *sk;
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 	u32 i;
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-	synchronize_rcu();
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-
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 	/*
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 	 * ops->map_*_elem() will not be able to access this
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 	 * array now. Hence, this function only races with
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@@ -151,32 +152,29 @@
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 {
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 	int err, numa_node = bpf_map_attr_numa_node(attr);
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 	struct reuseport_array *array;
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-	u64 cost, array_size;
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+	struct bpf_map_memory mem;
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+	u64 array_size;
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157
 
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-	if (!capable(CAP_SYS_ADMIN))
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+	if (!bpf_capable())
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 		return ERR_PTR(-EPERM);
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160
 
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 	array_size = sizeof(*array);
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 	array_size += (u64)attr->max_entries * sizeof(struct sock *);
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163
 
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-	/* make sure there is no u32 overflow later in round_up() */
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-	cost = array_size;
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-	if (cost >= U32_MAX - PAGE_SIZE)
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-		return ERR_PTR(-ENOMEM);
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-	cost = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
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-
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-	err = bpf_map_precharge_memlock(cost);
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+	err = bpf_map_charge_init(&mem, array_size);
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 	if (err)
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 		return ERR_PTR(err);
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167
 
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 	/* allocate all map elements and zero-initialize them */
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 	array = bpf_map_area_alloc(array_size, numa_node);
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-	if (!array)
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+	if (!array) {
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+		bpf_map_charge_finish(&mem);
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 		return ERR_PTR(-ENOMEM);
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+	}
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174
 
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 	/* copy mandatory map attributes */
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 	bpf_map_init_from_attr(&array->map, attr);
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-	array->map.pages = cost;
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+	bpf_map_charge_move(&array->map.memory, &mem);
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178
 
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 	return &array->map;
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 }
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@@ -193,7 +191,7 @@
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 	rcu_read_lock();
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 	sk = reuseport_array_lookup_elem(map, key);
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 	if (sk) {
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-		*(u64 *)value = sock_gen_cookie(sk);
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+		*(u64 *)value = __sock_gen_cookie(sk);
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 		err = 0;
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 	} else {
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 		err = -ENOENT;
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@@ -255,6 +253,7 @@
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 	struct sock *free_osk = NULL, *osk, *nsk;
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 	struct sock_reuseport *reuse;
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 	u32 index = *(u32 *)key;
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+	uintptr_t sk_user_data;
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 	struct socket *socket;
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 	int err, fd;
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259
 
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@@ -308,12 +307,9 @@
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 	if (err)
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 		goto put_file_unlock;
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309
 
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-	/* Ensure reuse->reuseport_id is set */
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-	err = reuseport_get_id(reuse);
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-	if (err < 0)
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-		goto put_file_unlock;
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-
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-	WRITE_ONCE(nsk->sk_user_data, &array->ptrs[index]);
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+	sk_user_data = (uintptr_t)&array->ptrs[index] | SK_USER_DATA_NOCOPY |
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+		SK_USER_DATA_BPF;
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+	WRITE_ONCE(nsk->sk_user_data, (void *)sk_user_data);
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 	rcu_assign_pointer(array->ptrs[index], nsk);
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 	free_osk = osk;
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 	err = 0;
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@@ -353,11 +349,15 @@
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 	return 0;
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 }
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351
 
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+static int reuseport_array_map_btf_id;
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 const struct bpf_map_ops reuseport_array_ops = {
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+	.map_meta_equal = bpf_map_meta_equal,
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 	.map_alloc_check = reuseport_array_alloc_check,
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 	.map_alloc = reuseport_array_alloc,
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 	.map_free = reuseport_array_free,
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 	.map_lookup_elem = reuseport_array_lookup_elem,
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 	.map_get_next_key = reuseport_array_get_next_key,
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 	.map_delete_elem = reuseport_array_delete_elem,
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+	.map_btf_name = "reuseport_array",
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+	.map_btf_id = &reuseport_array_map_btf_id,
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363
 };