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Subject[PATCH bpf-next 1/4] bpf: Generalize bpf_sk_storage
Date
From: KP Singh <kpsingh@google.com>

Refactor the functionality in bpf_sk_storage.c so that concept of
storage linked to kernel objects can be extended to other objects like
inode, task_struct etc.

bpf_sk_storage is updated to be bpf_local_storage with a union that
contains a pointer to the owner object. The type of the
bpf_local_storage can be determined using the newly added
bpf_local_storage_type enum.

Each new local storage will still be a separate map and provide its own
set of helpers. This allows for future object specific extensions and
still share a lot of the underlying implementation.

Signed-off-by: KP Singh <kpsingh@google.com>
---
.../bpf_local_storage.h} | 6 +-
include/net/sock.h | 4 +-
include/uapi/linux/bpf.h | 13 +-
kernel/bpf/Makefile | 4 +
.../bpf/bpf_local_storage.c | 593 ++++++++++--------
kernel/bpf/cgroup.c | 2 +-
net/bpf/test_run.c | 2 +-
net/core/Makefile | 1 -
net/core/filter.c | 2 +-
net/core/sock.c | 2 +-
net/ipv4/bpf_tcp_ca.c | 2 +-
net/ipv4/inet_diag.c | 2 +-
tools/include/uapi/linux/bpf.h | 13 +-
13 files changed, 365 insertions(+), 281 deletions(-)
rename include/{net/bpf_sk_storage.h => linux/bpf_local_storage.h} (93%)
rename net/core/bpf_sk_storage.c => kernel/bpf/bpf_local_storage.c (63%)

diff --git a/include/net/bpf_sk_storage.h b/include/linux/bpf_local_storage.h
similarity index 93%
rename from include/net/bpf_sk_storage.h
rename to include/linux/bpf_local_storage.h
index 5036c94c0503..85524f18cd91 100644
--- a/include/net/bpf_sk_storage.h
+++ b/include/linux/bpf_local_storage.h
@@ -1,7 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2019 Facebook */
-#ifndef _BPF_SK_STORAGE_H
-#define _BPF_SK_STORAGE_H
+#ifndef _BPF_LOCAL_STORAGE_H
+#define _BPF_LOCAL_STORAGE_H

struct sock;

@@ -47,4 +47,4 @@ static inline int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
}
#endif

-#endif /* _BPF_SK_STORAGE_H */
+#endif /* _BPF_LOCAL_STORAGE_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 3e8c6d4b4b59..06b093788eb6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -245,7 +245,7 @@ struct sock_common {
/* public: */
};

-struct bpf_sk_storage;
+struct bpf_local_storage;

/**
* struct sock - network layer representation of sockets
@@ -516,7 +516,7 @@ struct sock {
void (*sk_destruct)(struct sock *sk);
struct sock_reuseport __rcu *sk_reuseport_cb;
#ifdef CONFIG_BPF_SYSCALL
- struct bpf_sk_storage __rcu *sk_bpf_storage;
+ struct bpf_local_storage __rcu *sk_bpf_storage;
#endif
struct rcu_head sk_rcu;
};
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 97e1fd19ff58..4a202eea15c0 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2788,10 +2788,10 @@ union bpf_attr {
* "type". The bpf-local-storage "type" (i.e. the *map*) is
* searched against all bpf-local-storages residing at *sk*.
*
- * An optional *flags* (**BPF_SK_STORAGE_GET_F_CREATE**) can be
+ * An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
* used such that a new bpf-local-storage will be
* created if one does not exist. *value* can be used
- * together with **BPF_SK_STORAGE_GET_F_CREATE** to specify
+ * together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
* the initial value of a bpf-local-storage. If *value* is
* **NULL**, the new bpf-local-storage will be zero initialized.
* Return
@@ -3388,11 +3388,16 @@ enum {
BPF_F_SYSCTL_BASE_NAME = (1ULL << 0),
};

-/* BPF_FUNC_sk_storage_get flags */
+/* BPF_FUNC_<local>_storage_get flags */
enum {
- BPF_SK_STORAGE_GET_F_CREATE = (1ULL << 0),
+ BPF_LOCAL_STORAGE_GET_F_CREATE = (1ULL << 0),
+ /* BPF_SK_STORAGE_GET_F_CREATE is only kept for backward compatibility
+ * and BPF_LOCAL_STORAGE_GET_F_CREATE must be used instead.
+ */
+ BPF_SK_STORAGE_GET_F_CREATE = BPF_LOCAL_STORAGE_GET_F_CREATE,
};

+
/* BPF_FUNC_read_branch_records flags. */
enum {
BPF_F_GET_BRANCH_RECORDS_SIZE = (1ULL << 0),
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index 375b933010dd..0d2c6703e279 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -12,6 +12,10 @@ obj-$(CONFIG_BPF_JIT) += dispatcher.o
ifeq ($(CONFIG_NET),y)
obj-$(CONFIG_BPF_SYSCALL) += devmap.o
obj-$(CONFIG_BPF_SYSCALL) += cpumap.o
+obj-$(CONFIG_BPF_SYSCALL) += bpf_local_storage.o
+ifeq ($(CONFIG_XDP_SOCKETS),y)
+obj-$(CONFIG_BPF_SYSCALL) += xskmap.o
+endif
obj-$(CONFIG_BPF_SYSCALL) += offload.o
endif
ifeq ($(CONFIG_PERF_EVENTS),y)
diff --git a/net/core/bpf_sk_storage.c b/kernel/bpf/bpf_local_storage.c
similarity index 63%
rename from net/core/bpf_sk_storage.c
rename to kernel/bpf/bpf_local_storage.c
index d2c4d16dadba..0a1caac2f5f7 100644
--- a/net/core/bpf_sk_storage.c
+++ b/kernel/bpf/bpf_local_storage.c
@@ -6,14 +6,14 @@
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bpf.h>
-#include <net/bpf_sk_storage.h>
+#include <linux/bpf_local_storage.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>

static atomic_t cache_idx;

-#define SK_STORAGE_CREATE_FLAG_MASK \
+#define LOCAL_STORAGE_CREATE_FLAG_MASK \
(BPF_F_NO_PREALLOC | BPF_F_CLONE)

struct bucket {
@@ -21,11 +21,15 @@ struct bucket {
raw_spinlock_t lock;
};

-/* Thp map is not the primary owner of a bpf_sk_storage_elem.
+enum bpf_local_storage_type {
+ BPF_LOCAL_STORAGE_SK,
+};
+
+/* Thp map is not the primary owner of a bpf_local_storage_elem.
* Instead, the sk->sk_bpf_storage is.
*
- * The map (bpf_sk_storage_map) is for two purposes
- * 1. Define the size of the "sk local storage". It is
+ * The map (bpf_local_storage_map) is for two purposes
+ * 1. Define the size of the "local storage". It is
* the map's value_size.
*
* 2. Maintain a list to keep track of all elems such
@@ -34,12 +38,12 @@ struct bucket {
* When a bpf local storage is being looked up for a
* particular sk, the "bpf_map" pointer is actually used
* as the "key" to search in the list of elem in
- * sk->sk_bpf_storage.
+ * the respective bpf_local_storage owned by the object.
*
- * Hence, consider sk->sk_bpf_storage is the mini-map
- * with the "bpf_map" pointer as the searching key.
+ * e.g. sk->sk_bpf_storage is the mini-map with the "bpf_map" pointer
+ * as the searching key.
*/
-struct bpf_sk_storage_map {
+struct bpf_local_storage_map {
struct bpf_map map;
/* Lookup elem does not require accessing the map.
*
@@ -53,46 +57,51 @@ struct bpf_sk_storage_map {
u16 cache_idx;
};

-struct bpf_sk_storage_data {
+struct bpf_local_storage_data {
/* smap is used as the searching key when looking up
* from sk->sk_bpf_storage.
*
* Put it in the same cacheline as the data to minimize
* the number of cachelines access during the cache hit case.
*/
- struct bpf_sk_storage_map __rcu *smap;
+ struct bpf_local_storage_map __rcu *smap;
u8 data[] __aligned(8);
};

-/* Linked to bpf_sk_storage and bpf_sk_storage_map */
-struct bpf_sk_storage_elem {
- struct hlist_node map_node; /* Linked to bpf_sk_storage_map */
- struct hlist_node snode; /* Linked to bpf_sk_storage */
- struct bpf_sk_storage __rcu *sk_storage;
+/* Linked to bpf_local_storage and bpf_local_storage_map */
+struct bpf_local_storage_elem {
+ struct hlist_node map_node; /* Linked to bpf_local_storage_map */
+ struct hlist_node snode; /* Linked to bpf_local_storage */
+ struct bpf_local_storage __rcu *local_storage;
struct rcu_head rcu;
/* 8 bytes hole */
/* The data is stored in aother cacheline to minimize
* the number of cachelines access during a cache hit.
*/
- struct bpf_sk_storage_data sdata ____cacheline_aligned;
+ struct bpf_local_storage_data sdata ____cacheline_aligned;
};

-#define SELEM(_SDATA) container_of((_SDATA), struct bpf_sk_storage_elem, sdata)
+#define SELEM(_SDATA) \
+ container_of((_SDATA), struct bpf_local_storage_elem, sdata)
#define SDATA(_SELEM) (&(_SELEM)->sdata)
-#define BPF_SK_STORAGE_CACHE_SIZE 16
-
-struct bpf_sk_storage {
- struct bpf_sk_storage_data __rcu *cache[BPF_SK_STORAGE_CACHE_SIZE];
- struct hlist_head list; /* List of bpf_sk_storage_elem */
- struct sock *sk; /* The sk that owns the the above "list" of
- * bpf_sk_storage_elem.
- */
+#define BPF_STORAGE_CACHE_SIZE 16
+
+struct bpf_local_storage {
+ struct bpf_local_storage_data __rcu *cache[BPF_STORAGE_CACHE_SIZE];
+ struct hlist_head list; /* List of bpf_local_storage_elem */
+ /* The object that owns the the above "list" of
+ * bpf_local_storage_elem
+ */
+ union {
+ struct sock *sk;
+ };
struct rcu_head rcu;
raw_spinlock_t lock; /* Protect adding/removing from the "list" */
+ enum bpf_local_storage_type stype;
};

-static struct bucket *select_bucket(struct bpf_sk_storage_map *smap,
- struct bpf_sk_storage_elem *selem)
+static struct bucket *select_bucket(struct bpf_local_storage_map *smap,
+ struct bpf_local_storage_elem *selem)
{
return &smap->buckets[hash_ptr(selem, smap->bucket_log)];
}
@@ -109,24 +118,20 @@ static int omem_charge(struct sock *sk, unsigned int size)
return -ENOMEM;
}

-static bool selem_linked_to_sk(const struct bpf_sk_storage_elem *selem)
+static bool selem_linked_to_node(const struct bpf_local_storage_elem *selem)
{
return !hlist_unhashed(&selem->snode);
}

-static bool selem_linked_to_map(const struct bpf_sk_storage_elem *selem)
+static bool selem_linked_to_map(const struct bpf_local_storage_elem *selem)
{
return !hlist_unhashed(&selem->map_node);
}

-static struct bpf_sk_storage_elem *selem_alloc(struct bpf_sk_storage_map *smap,
- struct sock *sk, void *value,
- bool charge_omem)
+static struct bpf_local_storage_elem *selem_alloc(
+ struct bpf_local_storage_map *smap, void *value)
{
- struct bpf_sk_storage_elem *selem;
-
- if (charge_omem && omem_charge(sk, smap->elem_size))
- return NULL;
+ struct bpf_local_storage_elem *selem;

selem = kzalloc(smap->elem_size, GFP_ATOMIC | __GFP_NOWARN);
if (selem) {
@@ -135,94 +140,103 @@ static struct bpf_sk_storage_elem *selem_alloc(struct bpf_sk_storage_map *smap,
return selem;
}

+ return NULL;
+}
+
+static struct bpf_local_storage_elem *sk_selem_alloc(
+ struct bpf_local_storage_map *smap, struct sock *sk, void *value,
+ bool charge_omem)
+{
+ struct bpf_local_storage_elem *selem;
+
+ if (charge_omem && omem_charge(sk, smap->elem_size))
+ return NULL;
+
+ selem = selem_alloc(smap, value);
+ if (selem)
+ return selem;
+
if (charge_omem)
atomic_sub(smap->elem_size, &sk->sk_omem_alloc);

return NULL;
}

-/* sk_storage->lock must be held and selem->sk_storage == sk_storage.
+static void __unlink_local_storage(struct bpf_local_storage *local_storage,
+ bool uncharge_omem)
+{
+ struct sock *sk;
+
+ switch (local_storage->stype) {
+ case BPF_LOCAL_STORAGE_SK:
+ sk = local_storage->sk;
+ if (uncharge_omem)
+ atomic_sub(sizeof(struct bpf_local_storage),
+ &sk->sk_omem_alloc);
+
+ /* After this RCU_INIT, sk may be freed and cannot be used */
+ RCU_INIT_POINTER(sk->sk_bpf_storage, NULL);
+ local_storage->sk = NULL;
+ break;
+ }
+}
+
+/* local_storage->lock must be held and selem->local_storage == local_storage.
* The caller must ensure selem->smap is still valid to be
* dereferenced for its smap->elem_size and smap->cache_idx.
+ *
+ * uncharge_omem is only relevant when:
+ *
+ * local_storage->stype == BPF_LOCAL_STORAGE_SK
+ *
*/
-static bool __selem_unlink_sk(struct bpf_sk_storage *sk_storage,
- struct bpf_sk_storage_elem *selem,
- bool uncharge_omem)
+static bool __selem_unlink(struct bpf_local_storage *local_storage,
+ struct bpf_local_storage_elem *selem,
+ bool uncharge_omem)
{
- struct bpf_sk_storage_map *smap;
- bool free_sk_storage;
- struct sock *sk;
+ struct bpf_local_storage_map *smap;
+ bool free_local_storage;

smap = rcu_dereference(SDATA(selem)->smap);
- sk = sk_storage->sk;
-
- /* All uncharging on sk->sk_omem_alloc must be done first.
- * sk may be freed once the last selem is unlinked from sk_storage.
+ free_local_storage = hlist_is_singular_node(&selem->snode,
+ &local_storage->list);
+
+ /* local_storage is not freed now. local_storage->lock is
+ * still held and raw_spin_unlock_bh(&local_storage->lock)
+ * will be done by the caller.
+ * Although the unlock will be done under
+ * rcu_read_lock(), it is more intutivie to
+ * read if kfree_rcu(local_storage, rcu) is done
+ * after the raw_spin_unlock_bh(&local_storage->lock).
+ *
+ * Hence, a "bool free_local_storage" is returned
+ * to the caller which then calls the kfree_rcu()
+ * after unlock.
*/
- if (uncharge_omem)
- atomic_sub(smap->elem_size, &sk->sk_omem_alloc);
+ if (free_local_storage)
+ __unlink_local_storage(local_storage, uncharge_omem);

- free_sk_storage = hlist_is_singular_node(&selem->snode,
- &sk_storage->list);
- if (free_sk_storage) {
- atomic_sub(sizeof(struct bpf_sk_storage), &sk->sk_omem_alloc);
- sk_storage->sk = NULL;
- /* After this RCU_INIT, sk may be freed and cannot be used */
- RCU_INIT_POINTER(sk->sk_bpf_storage, NULL);

- /* sk_storage is not freed now. sk_storage->lock is
- * still held and raw_spin_unlock_bh(&sk_storage->lock)
- * will be done by the caller.
- *
- * Although the unlock will be done under
- * rcu_read_lock(), it is more intutivie to
- * read if kfree_rcu(sk_storage, rcu) is done
- * after the raw_spin_unlock_bh(&sk_storage->lock).
- *
- * Hence, a "bool free_sk_storage" is returned
- * to the caller which then calls the kfree_rcu()
- * after unlock.
- */
- }
hlist_del_init_rcu(&selem->snode);
- if (rcu_access_pointer(sk_storage->cache[smap->cache_idx]) ==
+ if (rcu_access_pointer(local_storage->cache[smap->cache_idx]) ==
SDATA(selem))
- RCU_INIT_POINTER(sk_storage->cache[smap->cache_idx], NULL);
+ RCU_INIT_POINTER(local_storage->cache[smap->cache_idx], NULL);

kfree_rcu(selem, rcu);

- return free_sk_storage;
+ return free_local_storage;
}

-static void selem_unlink_sk(struct bpf_sk_storage_elem *selem)
+static void __selem_link(struct bpf_local_storage *local_storage,
+ struct bpf_local_storage_elem *selem)
{
- struct bpf_sk_storage *sk_storage;
- bool free_sk_storage = false;
-
- if (unlikely(!selem_linked_to_sk(selem)))
- /* selem has already been unlinked from sk */
- return;
-
- sk_storage = rcu_dereference(selem->sk_storage);
- raw_spin_lock_bh(&sk_storage->lock);
- if (likely(selem_linked_to_sk(selem)))
- free_sk_storage = __selem_unlink_sk(sk_storage, selem, true);
- raw_spin_unlock_bh(&sk_storage->lock);
-
- if (free_sk_storage)
- kfree_rcu(sk_storage, rcu);
-}
-
-static void __selem_link_sk(struct bpf_sk_storage *sk_storage,
- struct bpf_sk_storage_elem *selem)
-{
- RCU_INIT_POINTER(selem->sk_storage, sk_storage);
- hlist_add_head(&selem->snode, &sk_storage->list);
+ RCU_INIT_POINTER(selem->local_storage, local_storage);
+ hlist_add_head(&selem->snode, &local_storage->list);
}

-static void selem_unlink_map(struct bpf_sk_storage_elem *selem)
+static void selem_unlink_map(struct bpf_local_storage_elem *selem)
{
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_map *smap;
struct bucket *b;

if (unlikely(!selem_linked_to_map(selem)))
@@ -237,8 +251,8 @@ static void selem_unlink_map(struct bpf_sk_storage_elem *selem)
raw_spin_unlock_bh(&b->lock);
}

-static void selem_link_map(struct bpf_sk_storage_map *smap,
- struct bpf_sk_storage_elem *selem)
+static void selem_link_map(struct bpf_local_storage_map *smap,
+ struct bpf_local_storage_elem *selem)
{
struct bucket *b = select_bucket(smap, selem);

@@ -248,31 +262,46 @@ static void selem_link_map(struct bpf_sk_storage_map *smap,
raw_spin_unlock_bh(&b->lock);
}

-static void selem_unlink(struct bpf_sk_storage_elem *selem)
+static void selem_unlink(struct bpf_local_storage_elem *selem)
{
- /* Always unlink from map before unlinking from sk_storage
+ struct bpf_local_storage *local_storage;
+ bool free_local_storage = false;
+
+ /* Always unlink from map before unlinking from local_storage
* because selem will be freed after successfully unlinked from
- * the sk_storage.
+ * the local_storage.
*/
selem_unlink_map(selem);
- selem_unlink_sk(selem);
+
+ if (unlikely(!selem_linked_to_node(selem)))
+ /* selem has already been unlinked from its owner */
+ return;
+
+ local_storage = rcu_dereference(selem->local_storage);
+ raw_spin_lock_bh(&local_storage->lock);
+ if (likely(selem_linked_to_node(selem)))
+ free_local_storage = __selem_unlink(local_storage, selem, true);
+ raw_spin_unlock_bh(&local_storage->lock);
+
+ if (free_local_storage)
+ kfree_rcu(local_storage, rcu);
}

-static struct bpf_sk_storage_data *
-__sk_storage_lookup(struct bpf_sk_storage *sk_storage,
- struct bpf_sk_storage_map *smap,
+static struct bpf_local_storage_data *
+__local_storage_lookup(struct bpf_local_storage *local_storage,
+ struct bpf_local_storage_map *smap,
bool cacheit_lockit)
{
- struct bpf_sk_storage_data *sdata;
- struct bpf_sk_storage_elem *selem;
+ struct bpf_local_storage_data *sdata;
+ struct bpf_local_storage_elem *selem;

/* Fast path (cache hit) */
- sdata = rcu_dereference(sk_storage->cache[smap->cache_idx]);
+ sdata = rcu_dereference(local_storage->cache[smap->cache_idx]);
if (sdata && rcu_access_pointer(sdata->smap) == smap)
return sdata;

/* Slow path (cache miss) */
- hlist_for_each_entry_rcu(selem, &sk_storage->list, snode)
+ hlist_for_each_entry_rcu(selem, &local_storage->list, snode)
if (rcu_access_pointer(SDATA(selem)->smap) == smap)
break;

@@ -284,33 +313,33 @@ __sk_storage_lookup(struct bpf_sk_storage *sk_storage,
/* spinlock is needed to avoid racing with the
* parallel delete. Otherwise, publishing an already
* deleted sdata to the cache will become a use-after-free
- * problem in the next __sk_storage_lookup().
+ * problem in the next __local_storage_lookup().
*/
- raw_spin_lock_bh(&sk_storage->lock);
- if (selem_linked_to_sk(selem))
- rcu_assign_pointer(sk_storage->cache[smap->cache_idx],
- sdata);
- raw_spin_unlock_bh(&sk_storage->lock);
+ raw_spin_lock_bh(&local_storage->lock);
+ if (selem_linked_to_node(selem))
+ rcu_assign_pointer(
+ local_storage->cache[smap->cache_idx], sdata);
+ raw_spin_unlock_bh(&local_storage->lock);
}

return sdata;
}

-static struct bpf_sk_storage_data *
+static struct bpf_local_storage_data *
sk_storage_lookup(struct sock *sk, struct bpf_map *map, bool cacheit_lockit)
{
- struct bpf_sk_storage *sk_storage;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage *sk_storage;
+ struct bpf_local_storage_map *smap;

sk_storage = rcu_dereference(sk->sk_bpf_storage);
if (!sk_storage)
return NULL;

- smap = (struct bpf_sk_storage_map *)map;
- return __sk_storage_lookup(sk_storage, smap, cacheit_lockit);
+ smap = (struct bpf_local_storage_map *)map;
+ return __local_storage_lookup(sk_storage, smap, cacheit_lockit);
}

-static int check_flags(const struct bpf_sk_storage_data *old_sdata,
+static int check_flags(const struct bpf_local_storage_data *old_sdata,
u64 map_flags)
{
if (old_sdata && (map_flags & ~BPF_F_LOCK) == BPF_NOEXIST)
@@ -324,93 +353,129 @@ static int check_flags(const struct bpf_sk_storage_data *old_sdata,
return 0;
}

-static int sk_storage_alloc(struct sock *sk,
- struct bpf_sk_storage_map *smap,
- struct bpf_sk_storage_elem *first_selem)
+static struct bpf_local_storage *
+bpf_local_storage_alloc(struct bpf_local_storage_map *smap)
{
- struct bpf_sk_storage *prev_sk_storage, *sk_storage;
- int err;
+ struct bpf_local_storage *storage;

- err = omem_charge(sk, sizeof(*sk_storage));
- if (err)
- return err;
+ storage = kzalloc(sizeof(*storage), GFP_ATOMIC | __GFP_NOWARN);
+ if (!storage)
+ return NULL;

- sk_storage = kzalloc(sizeof(*sk_storage), GFP_ATOMIC | __GFP_NOWARN);
- if (!sk_storage) {
- err = -ENOMEM;
- goto uncharge;
- }
- INIT_HLIST_HEAD(&sk_storage->list);
- raw_spin_lock_init(&sk_storage->lock);
- sk_storage->sk = sk;
+ INIT_HLIST_HEAD(&storage->list);
+ raw_spin_lock_init(&storage->lock);
+ return storage;
+}

- __selem_link_sk(sk_storage, first_selem);
- selem_link_map(smap, first_selem);
- /* Publish sk_storage to sk. sk->sk_lock cannot be acquired.
- * Hence, atomic ops is used to set sk->sk_bpf_storage
- * from NULL to the newly allocated sk_storage ptr.
- *
- * From now on, the sk->sk_bpf_storage pointer is protected
- * by the sk_storage->lock. Hence, when freeing
- * the sk->sk_bpf_storage, the sk_storage->lock must
- * be held before setting sk->sk_bpf_storage to NULL.
- */
- prev_sk_storage = cmpxchg((struct bpf_sk_storage **)&sk->sk_bpf_storage,
- NULL, sk_storage);
- if (unlikely(prev_sk_storage)) {
- selem_unlink_map(first_selem);
- err = -EAGAIN;
- goto uncharge;
+/* Publish local_storage to the address. This is used because we are already
+ * in a region where we cannot grab a lock on the object owning the storage (
+ * (e.g sk->sk_lock). Hence, atomic ops is used.
+ *
+ * From now on, the addr pointer is protected
+ * by the local_storage->lock. Hence, upon freeing,
+ * the local_storage->lock must be held before unlinking the storage from the
+ * owner.
+ */
+static int publish_local_storage(struct bpf_local_storage_elem *first_selem,
+ struct bpf_local_storage **addr,
+ struct bpf_local_storage *curr)
+{
+ struct bpf_local_storage *prev;

+ prev = cmpxchg(addr, NULL, curr);
+ if (unlikely(prev)) {
/* Note that even first_selem was linked to smap's
* bucket->list, first_selem can be freed immediately
* (instead of kfree_rcu) because
- * bpf_sk_storage_map_free() does a
+ * bpf_local_storage_map_free() does a
* synchronize_rcu() before walking the bucket->list.
* Hence, no one is accessing selem from the
* bucket->list under rcu_read_lock().
*/
+ selem_unlink_map(first_selem);
+ return -EAGAIN;
}

return 0;
+}
+
+static int sk_storage_alloc(struct sock *sk,
+ struct bpf_local_storage_map *smap,
+ struct bpf_local_storage_elem *first_selem)
+{
+ struct bpf_local_storage *curr;
+ int err;
+
+ err = omem_charge(sk, sizeof(*curr));
+ if (err)
+ return err;
+
+ curr = bpf_local_storage_alloc(smap);
+ if (!curr) {
+ err = -ENOMEM;
+ goto uncharge;
+ }
+
+ curr->sk = sk;
+ curr->stype = BPF_LOCAL_STORAGE_SK;
+
+ __selem_link(curr, first_selem);
+ selem_link_map(smap, first_selem);
+
+ err = publish_local_storage(first_selem,
+ (struct bpf_local_storage **)&sk->sk_bpf_storage, curr);
+ if (err)
+ goto uncharge;
+
+ return 0;

uncharge:
- kfree(sk_storage);
- atomic_sub(sizeof(*sk_storage), &sk->sk_omem_alloc);
+ kfree(curr);
+ atomic_sub(sizeof(*curr), &sk->sk_omem_alloc);
return err;
}

+static int check_update_flags(struct bpf_map *map, u64 map_flags)
+{
+ /* BPF_EXIST and BPF_NOEXIST cannot be both set */
+ if (unlikely((map_flags & ~BPF_F_LOCK) > BPF_EXIST) ||
+ /* BPF_F_LOCK can only be used in a value with spin_lock */
+ unlikely((map_flags & BPF_F_LOCK) && !map_value_has_spin_lock(map)))
+ return -EINVAL;
+
+ return 0;
+}
+
/* sk cannot be going away because it is linking new elem
* to sk->sk_bpf_storage. (i.e. sk->sk_refcnt cannot be 0).
* Otherwise, it will become a leak (and other memory issues
* during map destruction).
*/
-static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk,
+static struct bpf_local_storage_data *sk_storage_update(struct sock *sk,
struct bpf_map *map,
void *value,
u64 map_flags)
{
- struct bpf_sk_storage_data *old_sdata = NULL;
- struct bpf_sk_storage_elem *selem;
- struct bpf_sk_storage *sk_storage;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_data *old_sdata = NULL;
+ struct bpf_local_storage_elem *selem;
+ struct bpf_local_storage *local_storage;
+ struct bpf_local_storage_map *smap;
int err;

- /* BPF_EXIST and BPF_NOEXIST cannot be both set */
- if (unlikely((map_flags & ~BPF_F_LOCK) > BPF_EXIST) ||
- /* BPF_F_LOCK can only be used in a value with spin_lock */
- unlikely((map_flags & BPF_F_LOCK) && !map_value_has_spin_lock(map)))
- return ERR_PTR(-EINVAL);
+ err = check_update_flags(map, map_flags);
+ if (err)
+ return ERR_PTR(err);

- smap = (struct bpf_sk_storage_map *)map;
- sk_storage = rcu_dereference(sk->sk_bpf_storage);
- if (!sk_storage || hlist_empty(&sk_storage->list)) {
+ smap = (struct bpf_local_storage_map *)map;
+
+ local_storage = rcu_dereference(sk->sk_bpf_storage);
+ if (!local_storage || hlist_empty(&local_storage->list)) {
/* Very first elem for this sk */
err = check_flags(NULL, map_flags);
if (err)
return ERR_PTR(err);

- selem = selem_alloc(smap, sk, value, true);
+ selem = sk_selem_alloc(smap, sk, value, true);
if (!selem)
return ERR_PTR(-ENOMEM);

@@ -426,25 +491,26 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk,

if ((map_flags & BPF_F_LOCK) && !(map_flags & BPF_NOEXIST)) {
/* Hoping to find an old_sdata to do inline update
- * such that it can avoid taking the sk_storage->lock
+ * such that it can avoid taking the local_storage->lock
* and changing the lists.
*/
- old_sdata = __sk_storage_lookup(sk_storage, smap, false);
+ old_sdata = __local_storage_lookup(local_storage, smap, false);
err = check_flags(old_sdata, map_flags);
if (err)
return ERR_PTR(err);
- if (old_sdata && selem_linked_to_sk(SELEM(old_sdata))) {
+
+ if (old_sdata && selem_linked_to_node(SELEM(old_sdata))) {
copy_map_value_locked(map, old_sdata->data,
value, false);
return old_sdata;
}
}

- raw_spin_lock_bh(&sk_storage->lock);
+ raw_spin_lock_bh(&local_storage->lock);

- /* Recheck sk_storage->list under sk_storage->lock */
- if (unlikely(hlist_empty(&sk_storage->list))) {
- /* A parallel del is happening and sk_storage is going
+ /* Recheck local_storage->list under local_storage->lock */
+ if (unlikely(hlist_empty(&local_storage->list))) {
+ /* A parallel del is happening and local_storage is going
* away. It has just been checked before, so very
* unlikely. Return instead of retry to keep things
* simple.
@@ -453,7 +519,7 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk,
goto unlock_err;
}

- old_sdata = __sk_storage_lookup(sk_storage, smap, false);
+ old_sdata = __local_storage_lookup(local_storage, smap, false);
err = check_flags(old_sdata, map_flags);
if (err)
goto unlock_err;
@@ -464,15 +530,15 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk,
goto unlock;
}

- /* sk_storage->lock is held. Hence, we are sure
+ /* local_storage->lock is held. Hence, we are sure
* we can unlink and uncharge the old_sdata successfully
* later. Hence, instead of charging the new selem now
* and then uncharge the old selem later (which may cause
* a potential but unnecessary charge failure), avoid taking
* a charge at all here (the "!old_sdata" check) and the
- * old_sdata will not be uncharged later during __selem_unlink_sk().
+ * old_sdata will not be uncharged later during __selem_unlink().
*/
- selem = selem_alloc(smap, sk, value, !old_sdata);
+ selem = sk_selem_alloc(smap, sk, value, !old_sdata);
if (!selem) {
err = -ENOMEM;
goto unlock_err;
@@ -481,27 +547,27 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk,
/* First, link the new selem to the map */
selem_link_map(smap, selem);

- /* Second, link (and publish) the new selem to sk_storage */
- __selem_link_sk(sk_storage, selem);
+ /* Second, link (and publish) the new selem to local_storage */
+ __selem_link(local_storage, selem);

/* Third, remove old selem, SELEM(old_sdata) */
if (old_sdata) {
selem_unlink_map(SELEM(old_sdata));
- __selem_unlink_sk(sk_storage, SELEM(old_sdata), false);
+ __selem_unlink(local_storage, SELEM(old_sdata), false);
}

unlock:
- raw_spin_unlock_bh(&sk_storage->lock);
+ raw_spin_unlock_bh(&local_storage->lock);
return SDATA(selem);

unlock_err:
- raw_spin_unlock_bh(&sk_storage->lock);
+ raw_spin_unlock_bh(&local_storage->lock);
return ERR_PTR(err);
}

static int sk_storage_delete(struct sock *sk, struct bpf_map *map)
{
- struct bpf_sk_storage_data *sdata;
+ struct bpf_local_storage_data *sdata;

sdata = sk_storage_lookup(sk, map, false);
if (!sdata)
@@ -515,8 +581,8 @@ static int sk_storage_delete(struct sock *sk, struct bpf_map *map)
/* Called by __sk_destruct() & bpf_sk_storage_clone() */
void bpf_sk_storage_free(struct sock *sk)
{
- struct bpf_sk_storage_elem *selem;
- struct bpf_sk_storage *sk_storage;
+ struct bpf_local_storage_elem *selem;
+ struct bpf_local_storage *sk_storage;
bool free_sk_storage = false;
struct hlist_node *n;

@@ -530,9 +596,9 @@ void bpf_sk_storage_free(struct sock *sk)
/* Netiher the bpf_prog nor the bpf-map's syscall
* could be modifying the sk_storage->list now.
* Thus, no elem can be added-to or deleted-from the
- * sk_storage->list by the bpf_prog or by the bpf-map's syscall.
+ * local_storage->list by the bpf_prog or by the bpf-map's syscall.
*
- * It is racing with bpf_sk_storage_map_free() alone
+ * It is racing with bpf_local_storage_map_free() alone
* when unlinking elem from the sk_storage->list and
* the map's bucket->list.
*/
@@ -542,7 +608,7 @@ void bpf_sk_storage_free(struct sock *sk)
* sk_storage.
*/
selem_unlink_map(selem);
- free_sk_storage = __selem_unlink_sk(sk_storage, selem, true);
+ free_sk_storage = __selem_unlink(sk_storage, selem, true);
}
raw_spin_unlock_bh(&sk_storage->lock);
rcu_read_unlock();
@@ -551,14 +617,14 @@ void bpf_sk_storage_free(struct sock *sk)
kfree_rcu(sk_storage, rcu);
}

-static void bpf_sk_storage_map_free(struct bpf_map *map)
+static void bpf_local_storage_map_free(struct bpf_map *map)
{
- struct bpf_sk_storage_elem *selem;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_elem *selem;
+ struct bpf_local_storage_map *smap;
struct bucket *b;
unsigned int i;

- smap = (struct bpf_sk_storage_map *)map;
+ smap = (struct bpf_local_storage_map *)map;

/* Note that this map might be concurrently cloned from
* bpf_sk_storage_clone. Wait for any existing bpf_sk_storage_clone
@@ -569,11 +635,11 @@ static void bpf_sk_storage_map_free(struct bpf_map *map)

/* bpf prog and the userspace can no longer access this map
* now. No new selem (of this map) can be added
- * to the sk->sk_bpf_storage or to the map bucket's list.
+ * to the bpf_local_storage or to the map bucket's list.
*
* The elem of this map can be cleaned up here
- * or
- * by bpf_sk_storage_free() during __sk_destruct().
+ * or by bpf_local_storage_free() during the destruction of the
+ * owner object. eg. __sk_destruct.
*/
for (i = 0; i < (1U << smap->bucket_log); i++) {
b = &smap->buckets[i];
@@ -581,7 +647,7 @@ static void bpf_sk_storage_map_free(struct bpf_map *map)
rcu_read_lock();
/* No one is adding to b->list now */
while ((selem = hlist_entry_safe(rcu_dereference_raw(hlist_first_rcu(&b->list)),
- struct bpf_sk_storage_elem,
+ struct bpf_local_storage_elem,
map_node))) {
selem_unlink(selem);
cond_resched_rcu();
@@ -589,17 +655,17 @@ static void bpf_sk_storage_map_free(struct bpf_map *map)
rcu_read_unlock();
}

- /* bpf_sk_storage_free() may still need to access the map.
- * e.g. bpf_sk_storage_free() has unlinked selem from the map
+ /* bpf_local_storage_free() may still need to access the map.
+ * e.g. bpf_local_storage_free() has unlinked selem from the map
* which then made the above while((selem = ...)) loop
* exited immediately.
*
- * However, the bpf_sk_storage_free() still needs to access
+ * However, the bpf_local_storage_free() still needs to access
* the smap->elem_size to do the uncharging in
- * __selem_unlink_sk().
+ * __selem_unlink().
*
* Hence, wait another rcu grace period for the
- * bpf_sk_storage_free() to finish.
+ * bpf_local_storage_free() to finish.
*/
synchronize_rcu();

@@ -612,12 +678,13 @@ static void bpf_sk_storage_map_free(struct bpf_map *map)
*/
#define MAX_VALUE_SIZE \
min_t(u32, \
- (KMALLOC_MAX_SIZE - MAX_BPF_STACK - sizeof(struct bpf_sk_storage_elem)), \
- (U16_MAX - sizeof(struct bpf_sk_storage_elem)))
+ (KMALLOC_MAX_SIZE - MAX_BPF_STACK - \
+ sizeof(struct bpf_local_storage_elem)), \
+ (U16_MAX - sizeof(struct bpf_local_storage_elem)))

-static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr)
+static int bpf_local_storage_map_alloc_check(union bpf_attr *attr)
{
- if (attr->map_flags & ~SK_STORAGE_CREATE_FLAG_MASK ||
+ if (attr->map_flags & ~LOCAL_STORAGE_CREATE_FLAG_MASK ||
!(attr->map_flags & BPF_F_NO_PREALLOC) ||
attr->max_entries ||
attr->key_size != sizeof(int) || !attr->value_size ||
@@ -634,9 +701,11 @@ static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr)
return 0;
}

-static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
+
+static struct bpf_map *
+bpf_local_storage_map_alloc(union bpf_attr *attr)
{
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_map *smap;
unsigned int i;
u32 nbuckets;
u64 cost;
@@ -672,9 +741,10 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
raw_spin_lock_init(&smap->buckets[i].lock);
}

- smap->elem_size = sizeof(struct bpf_sk_storage_elem) + attr->value_size;
+ smap->elem_size =
+ sizeof(struct bpf_local_storage_elem) + attr->value_size;
smap->cache_idx = (unsigned int)atomic_inc_return(&cache_idx) %
- BPF_SK_STORAGE_CACHE_SIZE;
+ BPF_STORAGE_CACHE_SIZE;

return &smap->map;
}
@@ -685,7 +755,7 @@ static int notsupp_get_next_key(struct bpf_map *map, void *key,
return -ENOTSUPP;
}

-static int bpf_sk_storage_map_check_btf(const struct bpf_map *map,
+static int bpf_local_storage_map_check_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type)
@@ -702,11 +772,11 @@ static int bpf_sk_storage_map_check_btf(const struct bpf_map *map,
return 0;
}

-static void *bpf_fd_sk_storage_lookup_elem(struct bpf_map *map, void *key)
+static void *bpf_sk_storage_lookup_elem(struct bpf_map *map, void *key)
{
- struct bpf_sk_storage_data *sdata;
+ struct bpf_local_storage_data *sdata;
struct socket *sock;
- int fd, err;
+ int fd, err = -EINVAL;

fd = *(int *)key;
sock = sockfd_lookup(fd, &err);
@@ -719,17 +789,18 @@ static void *bpf_fd_sk_storage_lookup_elem(struct bpf_map *map, void *key)
return ERR_PTR(err);
}

-static int bpf_fd_sk_storage_update_elem(struct bpf_map *map, void *key,
+static int bpf_sk_storage_update_elem(struct bpf_map *map, void *key,
void *value, u64 map_flags)
{
- struct bpf_sk_storage_data *sdata;
+ struct bpf_local_storage_data *sdata;
struct socket *sock;
- int fd, err;
+ int fd, err = -EINVAL;

fd = *(int *)key;
sock = sockfd_lookup(fd, &err);
if (sock) {
- sdata = sk_storage_update(sock->sk, map, value, map_flags);
+ sdata = sk_storage_update(sock->sk, map, value,
+ map_flags);
sockfd_put(sock);
return PTR_ERR_OR_ZERO(sdata);
}
@@ -737,30 +808,29 @@ static int bpf_fd_sk_storage_update_elem(struct bpf_map *map, void *key,
return err;
}

-static int bpf_fd_sk_storage_delete_elem(struct bpf_map *map, void *key)
+static int bpf_sk_storage_delete_elem(struct bpf_map *map, void *key)
{
struct socket *sock;
- int fd, err;
+ int fd, err = -EINVAL;

fd = *(int *)key;
sock = sockfd_lookup(fd, &err);
if (sock) {
err = sk_storage_delete(sock->sk, map);
sockfd_put(sock);
- return err;
}

return err;
}

-static struct bpf_sk_storage_elem *
+static struct bpf_local_storage_elem *
bpf_sk_storage_clone_elem(struct sock *newsk,
- struct bpf_sk_storage_map *smap,
- struct bpf_sk_storage_elem *selem)
+ struct bpf_local_storage_map *smap,
+ struct bpf_local_storage_elem *selem)
{
- struct bpf_sk_storage_elem *copy_selem;
+ struct bpf_local_storage_elem *copy_selem;

- copy_selem = selem_alloc(smap, newsk, NULL, true);
+ copy_selem = sk_selem_alloc(smap, newsk, NULL, true);
if (!copy_selem)
return NULL;

@@ -776,9 +846,9 @@ bpf_sk_storage_clone_elem(struct sock *newsk,

int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
{
- struct bpf_sk_storage *new_sk_storage = NULL;
- struct bpf_sk_storage *sk_storage;
- struct bpf_sk_storage_elem *selem;
+ struct bpf_local_storage *new_sk_storage = NULL;
+ struct bpf_local_storage *sk_storage;
+ struct bpf_local_storage_elem *selem;
int ret = 0;

RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
@@ -790,8 +860,8 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
goto out;

hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) {
- struct bpf_sk_storage_elem *copy_selem;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_elem *copy_selem;
+ struct bpf_local_storage_map *smap;
struct bpf_map *map;

smap = rcu_dereference(SDATA(selem)->smap);
@@ -799,7 +869,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
continue;

/* Note that for lockless listeners adding new element
- * here can race with cleanup in bpf_sk_storage_map_free.
+ * here can race with cleanup in bpf_local_storage_map_free.
* Try to grab map refcnt to make sure that it's still
* alive and prevent concurrent removal.
*/
@@ -816,7 +886,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)

if (new_sk_storage) {
selem_link_map(smap, copy_selem);
- __selem_link_sk(new_sk_storage, copy_selem);
+ __selem_link(new_sk_storage, copy_selem);
} else {
ret = sk_storage_alloc(newsk, smap, copy_selem);
if (ret) {
@@ -827,7 +897,8 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
goto out;
}

- new_sk_storage = rcu_dereference(copy_selem->sk_storage);
+ new_sk_storage =
+ rcu_dereference(copy_selem->local_storage);
}
bpf_map_put(map);
}
@@ -836,7 +907,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
rcu_read_unlock();

/* In case of an error, don't free anything explicitly here, the
- * caller is responsible to call bpf_sk_storage_free.
+ * caller is responsible to call bpf_local_storage_free.
*/

return ret;
@@ -845,7 +916,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk)
BPF_CALL_4(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk,
void *, value, u64, flags)
{
- struct bpf_sk_storage_data *sdata;
+ struct bpf_local_storage_data *sdata;

if (flags > BPF_SK_STORAGE_GET_F_CREATE)
return (unsigned long)NULL;
@@ -854,7 +925,7 @@ BPF_CALL_4(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk,
if (sdata)
return (unsigned long)sdata->data;

- if (flags == BPF_SK_STORAGE_GET_F_CREATE &&
+ if (flags == BPF_LOCAL_STORAGE_GET_F_CREATE &&
/* Cannot add new elem to a going away sk.
* Otherwise, the new elem may become a leak
* (and also other memory issues during map
@@ -887,14 +958,14 @@ BPF_CALL_2(bpf_sk_storage_delete, struct bpf_map *, map, struct sock *, sk)
}

const struct bpf_map_ops sk_storage_map_ops = {
- .map_alloc_check = bpf_sk_storage_map_alloc_check,
- .map_alloc = bpf_sk_storage_map_alloc,
- .map_free = bpf_sk_storage_map_free,
+ .map_alloc_check = bpf_local_storage_map_alloc_check,
+ .map_alloc = bpf_local_storage_map_alloc,
+ .map_free = bpf_local_storage_map_free,
.map_get_next_key = notsupp_get_next_key,
- .map_lookup_elem = bpf_fd_sk_storage_lookup_elem,
- .map_update_elem = bpf_fd_sk_storage_update_elem,
- .map_delete_elem = bpf_fd_sk_storage_delete_elem,
- .map_check_btf = bpf_sk_storage_map_check_btf,
+ .map_lookup_elem = bpf_sk_storage_lookup_elem,
+ .map_update_elem = bpf_sk_storage_update_elem,
+ .map_delete_elem = bpf_sk_storage_delete_elem,
+ .map_check_btf = bpf_local_storage_map_check_btf,
};

const struct bpf_func_proto bpf_sk_storage_get_proto = {
@@ -975,7 +1046,7 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs)
u32 nr_maps = 0;
int rem, err;

- /* bpf_sk_storage_map is currently limited to CAP_SYS_ADMIN as
+ /* bpf_local_storage_map is currently limited to CAP_SYS_ADMIN as
* the map_alloc_check() side also does.
*/
if (!bpf_capable())
@@ -1025,10 +1096,10 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs)
}
EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_alloc);

-static int diag_get(struct bpf_sk_storage_data *sdata, struct sk_buff *skb)
+static int diag_get(struct bpf_local_storage_data *sdata, struct sk_buff *skb)
{
struct nlattr *nla_stg, *nla_value;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage_map *smap;

/* It cannot exceed max nlattr's payload */
BUILD_BUG_ON(U16_MAX - NLA_HDRLEN < MAX_VALUE_SIZE);
@@ -1067,9 +1138,9 @@ static int bpf_sk_storage_diag_put_all(struct sock *sk, struct sk_buff *skb,
{
/* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
unsigned int diag_size = nla_total_size(0);
- struct bpf_sk_storage *sk_storage;
- struct bpf_sk_storage_elem *selem;
- struct bpf_sk_storage_map *smap;
+ struct bpf_local_storage *sk_storage;
+ struct bpf_local_storage_elem *selem;
+ struct bpf_local_storage_map *smap;
struct nlattr *nla_stgs;
unsigned int saved_len;
int err = 0;
@@ -1122,8 +1193,8 @@ int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
{
/* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
unsigned int diag_size = nla_total_size(0);
- struct bpf_sk_storage *sk_storage;
- struct bpf_sk_storage_data *sdata;
+ struct bpf_local_storage *sk_storage;
+ struct bpf_local_storage_data *sdata;
struct nlattr *nla_stgs;
unsigned int saved_len;
int err = 0;
@@ -1150,8 +1221,8 @@ int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,

saved_len = skb->len;
for (i = 0; i < diag->nr_maps; i++) {
- sdata = __sk_storage_lookup(sk_storage,
- (struct bpf_sk_storage_map *)diag->maps[i],
+ sdata = __local_storage_lookup(sk_storage,
+ (struct bpf_local_storage_map *)diag->maps[i],
false);

if (!sdata)
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 5c0e964105ac..a6018ece357f 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -14,8 +14,8 @@
#include <linux/string.h>
#include <linux/bpf.h>
#include <linux/bpf-cgroup.h>
+#include <linux/bpf_local_storage.h>
#include <net/sock.h>
-#include <net/bpf_sk_storage.h>

#include "../cgroup/cgroup-internal.h"

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index bfd4ccd80847..b1547efcc842 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -7,7 +7,7 @@
#include <linux/etherdevice.h>
#include <linux/filter.h>
#include <linux/sched/signal.h>
-#include <net/bpf_sk_storage.h>
+#include <linux/bpf_local_storage.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <linux/error-injection.h>
diff --git a/net/core/Makefile b/net/core/Makefile
index 3e2c378e5f31..9ddc2f3ecd97 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -34,4 +34,3 @@ obj-$(CONFIG_HWBM) += hwbm.o
obj-$(CONFIG_NET_DEVLINK) += devlink.o
obj-$(CONFIG_GRO_CELLS) += gro_cells.o
obj-$(CONFIG_FAILOVER) += failover.o
-obj-$(CONFIG_BPF_SYSCALL) += bpf_sk_storage.o
diff --git a/net/core/filter.c b/net/core/filter.c
index bd2853d23b50..b1556baa1235 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -72,7 +72,7 @@
#include <net/seg6_local.h>
#include <net/lwtunnel.h>
#include <net/ipv6_stubs.h>
-#include <net/bpf_sk_storage.h>
+#include <linux/bpf_local_storage.h>

/**
* sk_filter_trim_cap - run a packet through a socket filter
diff --git a/net/core/sock.c b/net/core/sock.c
index fd85e651ce28..26e25b868dda 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -130,8 +130,8 @@
#include <linux/sock_diag.h>

#include <linux/filter.h>
+#include <linux/bpf_local_storage.h>
#include <net/sock_reuseport.h>
-#include <net/bpf_sk_storage.h>

#include <trace/events/sock.h>

diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index e3939f76b024..075abf1c6d7e 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -7,7 +7,7 @@
#include <linux/btf.h>
#include <linux/filter.h>
#include <net/tcp.h>
-#include <net/bpf_sk_storage.h>
+#include <linux/bpf_local_storage.h>

static u32 optional_ops[] = {
offsetof(struct tcp_congestion_ops, init),
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 125f4f8a36b4..ce22867cce5d 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -23,7 +23,7 @@
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/inet6_hashtables.h>
-#include <net/bpf_sk_storage.h>
+#include <linux/bpf_local_storage.h>
#include <net/netlink.h>

#include <linux/inet.h>
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 97e1fd19ff58..4a202eea15c0 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2788,10 +2788,10 @@ union bpf_attr {
* "type". The bpf-local-storage "type" (i.e. the *map*) is
* searched against all bpf-local-storages residing at *sk*.
*
- * An optional *flags* (**BPF_SK_STORAGE_GET_F_CREATE**) can be
+ * An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
* used such that a new bpf-local-storage will be
* created if one does not exist. *value* can be used
- * together with **BPF_SK_STORAGE_GET_F_CREATE** to specify
+ * together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
* the initial value of a bpf-local-storage. If *value* is
* **NULL**, the new bpf-local-storage will be zero initialized.
* Return
@@ -3388,11 +3388,16 @@ enum {
BPF_F_SYSCTL_BASE_NAME = (1ULL << 0),
};

-/* BPF_FUNC_sk_storage_get flags */
+/* BPF_FUNC_<local>_storage_get flags */
enum {
- BPF_SK_STORAGE_GET_F_CREATE = (1ULL << 0),
+ BPF_LOCAL_STORAGE_GET_F_CREATE = (1ULL << 0),
+ /* BPF_SK_STORAGE_GET_F_CREATE is only kept for backward compatibility
+ * and BPF_LOCAL_STORAGE_GET_F_CREATE must be used instead.
+ */
+ BPF_SK_STORAGE_GET_F_CREATE = BPF_LOCAL_STORAGE_GET_F_CREATE,
};

+
/* BPF_FUNC_read_branch_records flags. */
enum {
BPF_F_GET_BRANCH_RECORDS_SIZE = (1ULL << 0),
--
2.27.0.rc0.183.gde8f92d652-goog
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