@@ -4,11 +4,14 @@
#define _BPF_LOCAL_STORAGE_H
struct sock;
+struct inode;
void bpf_sk_storage_free(struct sock *sk);
extern const struct bpf_func_proto bpf_sk_storage_get_proto;
extern const struct bpf_func_proto bpf_sk_storage_delete_proto;
+extern const struct bpf_func_proto bpf_inode_storage_get_proto;
+extern const struct bpf_func_proto bpf_inode_storage_delete_proto;
struct bpf_sk_storage_diag;
struct sk_buff;
@@ -16,6 +19,7 @@ struct nlattr;
struct sock;
#ifdef CONFIG_BPF_SYSCALL
+void bpf_inode_storage_free(struct inode *inode);
int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk);
struct bpf_sk_storage_diag *
bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs);
@@ -35,6 +39,9 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla)
{
return NULL;
}
+static inline void void bpf_inode_storage_free(struct inode *inode)
+{
+}
static inline void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag)
{
}
@@ -17,9 +17,24 @@
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
+struct bpf_storage_blob {
+ struct bpf_local_storage __rcu *storage;
+};
+
+extern struct lsm_blob_sizes bpf_lsm_blob_sizes;
+
int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
const struct bpf_prog *prog);
+static inline struct bpf_storage_blob *bpf_inode(
+ const struct inode *inode)
+{
+ if (unlikely(!inode->i_security))
+ return NULL;
+
+ return inode->i_security + bpf_lsm_blob_sizes.lbs_inode;
+}
+
#else /* !CONFIG_BPF_LSM */
static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
@@ -28,6 +43,12 @@ static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
return -EOPNOTSUPP;
}
+static inline struct bpf_storage_blob *bpf_inode_storage(
+ const struct inode *inode)
+{
+ return NULL;
+}
+
#endif /* CONFIG_BPF_LSM */
#endif /* _LINUX_BPF_LSM_H */
@@ -101,6 +101,7 @@ BPF_MAP_TYPE(BPF_MAP_TYPE_HASH_OF_MAPS, htab_of_maps_map_ops)
BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP, dev_map_ops)
BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP_HASH, dev_map_hash_ops)
BPF_MAP_TYPE(BPF_MAP_TYPE_SK_STORAGE, sk_storage_map_ops)
+BPF_MAP_TYPE(BPF_MAP_TYPE_INODE_STORAGE, inode_storage_map_ops)
#if defined(CONFIG_BPF_STREAM_PARSER)
BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKMAP, sock_map_ops)
BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKHASH, sock_hash_ops)
@@ -148,6 +148,7 @@ enum bpf_map_type {
BPF_MAP_TYPE_DEVMAP_HASH,
BPF_MAP_TYPE_STRUCT_OPS,
BPF_MAP_TYPE_RINGBUF,
+ BPF_MAP_TYPE_INODE_STORAGE,
};
/* Note that tracing related programs such as
@@ -3252,6 +3253,41 @@ union bpf_attr {
* case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
* is returned or the error code -EACCES in case the skb is not
* subject to CHECKSUM_UNNECESSARY.
+ * void *bpf_inode_storage_get(struct bpf_map *map, void *inode, void *value, u64 flags)
+ * Description
+ * Get a bpf_local_storage from an *inode*.
+ *
+ * Logically, it could be thought of as getting the value from
+ * a *map* with *inode* as the **key**. From this
+ * perspective, the usage is not much different from
+ * **bpf_map_lookup_elem**\ (*map*, **&**\ *inode*) except this
+ * helper enforces the key must be an inode and the map must also
+ * be a **BPF_MAP_TYPE_INODE_STORAGE**.
+ *
+ * Underneath, the value is stored locally at *inode* instead of
+ * the *map*. The *map* is used as the bpf-local-storage
+ * "type". The bpf-local-storage "type" (i.e. the *map*) is
+ * searched against all bpf_local_storage residing at *inode*.
+ *
+ * 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_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
+ * A bpf_local_storage pointer is returned on success.
+ *
+ * **NULL** if not found or there was an error in adding
+ * a new bpf_local_storage.
+ *
+ * int bpf_inode_storage_delete(struct bpf_map *map, void *inode)
+ * Description
+ * Delete a bpf_local_storage from an *inode*.
+ * Return
+ * 0 on success.
+ *
+ * **-ENOENT** if the bpf_local_storage cannot be found.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3389,7 +3425,9 @@ union bpf_attr {
FN(ringbuf_submit), \
FN(ringbuf_discard), \
FN(ringbuf_query), \
- FN(csum_level),
+ FN(csum_level), \
+ FN(inode_storage_get), \
+ FN(inode_storage_delete),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
@@ -3,6 +3,7 @@
#include "linux/bpf.h"
#include "asm-generic/bug.h"
#include "linux/err.h"
+#include "linux/fs.h"
#include <linux/rculist.h>
#include <linux/list.h>
#include <linux/hash.h>
@@ -13,6 +14,7 @@
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>
+#include <linux/bpf_lsm.h>
static atomic_t cache_idx;
@@ -26,6 +28,7 @@ struct bucket {
enum bpf_local_storage_type {
BPF_LOCAL_STORAGE_SK,
+ BPF_LOCAL_STORAGE_INODE,
};
/* Thp map is not the primary owner of a bpf_local_storage_elem.
@@ -97,6 +100,7 @@ struct bpf_local_storage {
*/
union {
struct sock *sk;
+ struct inode *inode;
};
struct rcu_head rcu;
raw_spinlock_t lock; /* Protect adding/removing from the "list" */
@@ -168,6 +172,8 @@ static struct bpf_local_storage_elem *sk_selem_alloc(
static void __unlink_local_storage(struct bpf_local_storage *local_storage,
bool uncharge_omem)
{
+ struct bpf_storage_blob *bsb;
+ struct inode *inode;
struct sock *sk;
switch (local_storage->stype) {
@@ -181,6 +187,15 @@ static void __unlink_local_storage(struct bpf_local_storage *local_storage,
RCU_INIT_POINTER(sk->sk_bpf_storage, NULL);
local_storage->sk = NULL;
break;
+ case BPF_LOCAL_STORAGE_INODE:
+ inode = local_storage->inode;
+ bsb = bpf_inode(inode);
+ if (!bsb)
+ return;
+
+ RCU_INIT_POINTER(bsb->storage, NULL);
+ local_storage->inode = NULL;
+ break;
}
}
@@ -341,6 +356,25 @@ sk_storage_lookup(struct sock *sk, struct bpf_map *map, bool cacheit_lockit)
return __local_storage_lookup(sk_storage, smap, cacheit_lockit);
}
+static struct bpf_local_storage_data *inode_storage_lookup(
+ struct inode *inode, struct bpf_map *map, bool cacheit_lockit)
+{
+ struct bpf_local_storage *inode_storage;
+ struct bpf_local_storage_map *smap;
+ struct bpf_storage_blob *bsb;
+
+ bsb = bpf_inode(inode);
+ if (!bsb)
+ return ERR_PTR(-ENOENT);
+
+ inode_storage = rcu_dereference(bsb->storage);
+ if (!inode_storage)
+ return NULL;
+
+ smap = (struct bpf_local_storage_map *)map;
+ return __local_storage_lookup(inode_storage, smap, cacheit_lockit);
+}
+
static int check_flags(const struct bpf_local_storage_data *old_sdata,
u64 map_flags)
{
@@ -437,6 +471,38 @@ static int sk_storage_alloc(struct sock *sk,
return err;
}
+static int inode_storage_alloc(struct inode *inode,
+ struct bpf_local_storage_map *smap,
+ struct bpf_local_storage_elem *first_selem)
+{
+ struct bpf_storage_blob *bsb;
+ struct bpf_local_storage *curr;
+ int err;
+
+ bsb = bpf_inode(inode);
+ if (!bsb)
+ return -EINVAL;
+
+ curr = bpf_local_storage_alloc(smap);
+ if (!curr)
+ return -ENOMEM;
+
+ curr->inode = inode;
+ curr->stype = BPF_LOCAL_STORAGE_INODE;
+
+ __selem_link(curr, first_selem);
+ selem_link_map(smap, first_selem);
+
+ err = publish_local_storage(first_selem,
+ (struct bpf_local_storage **)&bsb->storage, curr);
+ if (err) {
+ kfree(curr);
+ return err;
+ }
+
+ return 0;
+}
+
static int check_update_flags(struct bpf_map *map, u64 map_flags)
{
/* BPF_EXIST and BPF_NOEXIST cannot be both set */
@@ -453,6 +519,8 @@ static int map_to_storage_type(struct bpf_map *map)
switch (map->map_type) {
case BPF_MAP_TYPE_SK_STORAGE:
return BPF_LOCAL_STORAGE_SK;
+ case BPF_MAP_TYPE_INODE_STORAGE:
+ return BPF_LOCAL_STORAGE_INODE;
default:
return -EINVAL;
}
@@ -471,6 +539,8 @@ static struct bpf_local_storage_data *local_storage_update(
struct bpf_local_storage *local_storage;
struct bpf_local_storage_map *smap;
enum bpf_local_storage_type stype;
+ struct bpf_storage_blob *bsb;
+ struct inode *inode;
struct sock *sk;
int err;
@@ -489,6 +559,11 @@ static struct bpf_local_storage_data *local_storage_update(
sk = owner;
local_storage = rcu_dereference(sk->sk_bpf_storage);
break;
+ case BPF_LOCAL_STORAGE_INODE:
+ inode = owner;
+ bsb = bpf_inode(inode);
+ local_storage = rcu_dereference(bsb->storage);
+ break;
default:
WARN_ON_ONCE(1);
return ERR_PTR(-EINVAL);
@@ -513,6 +588,18 @@ static struct bpf_local_storage_data *local_storage_update(
return ERR_PTR(err);
}
+ return SDATA(selem);
+ case BPF_LOCAL_STORAGE_INODE:
+ selem = selem_alloc(smap, value);
+ if (!selem)
+ return ERR_PTR(-ENOMEM);
+
+ err = inode_storage_alloc(inode, smap, selem);
+ if (err) {
+ kfree(selem);
+ return ERR_PTR(err);
+ }
+
return SDATA(selem);
}
}
@@ -574,6 +661,13 @@ static struct bpf_local_storage_data *local_storage_update(
goto unlock_err;
}
break;
+ case BPF_LOCAL_STORAGE_INODE:
+ selem = selem_alloc(smap, value);
+ if (!selem) {
+ err = -ENOMEM;
+ goto unlock_err;
+ }
+ break;
}
/* First, link the new selem to the map */
@@ -610,6 +704,19 @@ static int sk_storage_delete(struct sock *sk, struct bpf_map *map)
return 0;
}
+static int inode_storage_delete(struct inode *inode, struct bpf_map *map)
+{
+ struct bpf_local_storage_data *sdata;
+
+ sdata = inode_storage_lookup(inode, map, false);
+ if (!sdata)
+ return -ENOENT;
+
+ selem_unlink(SELEM(sdata));
+
+ return 0;
+}
+
/* Called by __sk_destruct() & bpf_sk_storage_clone() */
void bpf_sk_storage_free(struct sock *sk)
{
@@ -649,6 +756,55 @@ void bpf_sk_storage_free(struct sock *sk)
kfree_rcu(sk_storage, rcu);
}
+/* Called by __destroy_inode() */
+void bpf_inode_storage_free(struct inode *inode)
+{
+ struct bpf_local_storage_elem *selem;
+ struct bpf_local_storage *local_storage;
+ bool free_inode_storage = false;
+ struct bpf_storage_blob *bsb;
+ struct hlist_node *n;
+
+ bsb = bpf_inode(inode);
+ if (!bsb)
+ return;
+
+ rcu_read_lock();
+
+ local_storage = rcu_dereference(bsb->storage);
+ if (!local_storage) {
+ rcu_read_unlock();
+ return;
+ }
+
+ /* Netiher the bpf_prog nor the bpf-map's syscall
+ * could be modifying the local_storage->list now.
+ * Thus, no elem can be added-to or deleted-from the
+ * local_storage->list by the bpf_prog or by the bpf-map's syscall.
+ *
+ * It is racing with bpf_local_storage_map_free() alone
+ * when unlinking elem from the local_storage->list and
+ * the map's bucket->list.
+ */
+ raw_spin_lock_bh(&local_storage->lock);
+ hlist_for_each_entry_safe(selem, n, &local_storage->list, snode) {
+ /* Always unlink from map before unlinking from
+ * local_storage.
+ */
+ selem_unlink_map(selem);
+ free_inode_storage =
+ __selem_unlink(local_storage, selem, false);
+ }
+ raw_spin_unlock_bh(&local_storage->lock);
+ rcu_read_unlock();
+
+ /* free_inoode_storage should always be true as long as
+ * local_storage->list was non-empty.
+ */
+ if (free_inode_storage)
+ kfree_rcu(local_storage, rcu);
+}
+
static void bpf_local_storage_map_free(struct bpf_map *map)
{
struct bpf_local_storage_elem *selem;
@@ -671,7 +827,7 @@ static void bpf_local_storage_map_free(struct bpf_map *map)
*
* The elem of this map can be cleaned up here
* or by bpf_local_storage_free() during the destruction of the
- * owner object. eg. __sk_destruct.
+ * owner object. eg. __sk_destruct or __destroy_inode.
*/
for (i = 0; i < (1U << smap->bucket_log); i++) {
b = &smap->buckets[i];
@@ -821,6 +977,21 @@ static void *bpf_sk_storage_lookup_elem(struct bpf_map *map, void *key)
return ERR_PTR(err);
}
+static void *bpf_inode_storage_lookup_elem(struct bpf_map *map, void *key)
+{
+ struct bpf_local_storage_data *sdata;
+ struct inode *inode;
+ int err = -EINVAL;
+
+ if (key) {
+ inode = *(struct inode **)(key);
+ sdata = inode_storage_lookup(inode, map, true);
+ return sdata ? sdata->data : NULL;
+ }
+
+ return ERR_PTR(err);
+}
+
static int bpf_sk_storage_update_elem(struct bpf_map *map, void *key,
void *value, u64 map_flags)
{
@@ -839,6 +1010,21 @@ static int bpf_sk_storage_update_elem(struct bpf_map *map, void *key,
return err;
}
+static int bpf_inode_storage_update_elem(struct bpf_map *map, void *key,
+ void *value, u64 map_flags)
+{
+ struct bpf_local_storage_data *sdata;
+ struct inode *inode;
+ int err = -EINVAL;
+
+ if (key) {
+ inode = *(struct inode **)(key);
+ sdata = local_storage_update(inode, map, value, map_flags);
+ return PTR_ERR_OR_ZERO(sdata);
+ }
+ return err;
+}
+
static int bpf_sk_storage_delete_elem(struct bpf_map *map, void *key)
{
struct socket *sock;
@@ -854,6 +1040,19 @@ static int bpf_sk_storage_delete_elem(struct bpf_map *map, void *key)
return err;
}
+static int bpf_inode_storage_delete_elem(struct bpf_map *map, void *key)
+{
+ struct inode *inode;
+ int err = -EINVAL;
+
+ if (key) {
+ inode = *(struct inode **)(key);
+ err = inode_storage_delete(inode, map);
+ }
+
+ return err;
+}
+
static struct bpf_local_storage_elem *
bpf_sk_storage_clone_elem(struct sock *newsk,
struct bpf_local_storage_map *smap,
@@ -975,6 +1174,27 @@ BPF_CALL_4(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk,
return (unsigned long)NULL;
}
+BPF_CALL_4(bpf_inode_storage_get, struct bpf_map *, map, struct inode *, inode,
+ void *, value, u64, flags)
+{
+ struct bpf_local_storage_data *sdata;
+
+ if (flags & ~(BPF_LOCAL_STORAGE_GET_F_CREATE))
+ return (unsigned long)NULL;
+
+ sdata = inode_storage_lookup(inode, map, true);
+ if (sdata)
+ return (unsigned long)sdata->data;
+
+ if (flags & BPF_LOCAL_STORAGE_GET_F_CREATE) {
+ sdata = local_storage_update(inode, map, value, BPF_NOEXIST);
+ return IS_ERR(sdata) ?
+ (unsigned long)NULL : (unsigned long)sdata->data;
+ }
+
+ return (unsigned long)NULL;
+}
+
BPF_CALL_2(bpf_sk_storage_delete, struct bpf_map *, map, struct sock *, sk)
{
if (refcount_inc_not_zero(&sk->sk_refcnt)) {
@@ -988,6 +1208,12 @@ BPF_CALL_2(bpf_sk_storage_delete, struct bpf_map *, map, struct sock *, sk)
return -ENOENT;
}
+BPF_CALL_2(bpf_inode_storage_delete,
+ struct bpf_map *, map, struct inode *, inode)
+{
+ return inode_storage_delete(inode, map);
+}
+
const struct bpf_map_ops sk_storage_map_ops = {
.map_alloc_check = bpf_local_storage_map_alloc_check,
.map_alloc = bpf_local_storage_map_alloc,
@@ -999,6 +1225,17 @@ const struct bpf_map_ops sk_storage_map_ops = {
.map_check_btf = bpf_local_storage_map_check_btf,
};
+const struct bpf_map_ops inode_storage_map_ops = {
+ .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_inode_storage_lookup_elem,
+ .map_update_elem = bpf_inode_storage_update_elem,
+ .map_delete_elem = bpf_inode_storage_delete_elem,
+ .map_check_btf = bpf_local_storage_map_check_btf,
+};
+
const struct bpf_func_proto bpf_sk_storage_get_proto = {
.func = bpf_sk_storage_get,
.gpl_only = false,
@@ -1017,6 +1254,28 @@ const struct bpf_func_proto bpf_sk_storage_delete_proto = {
.arg2_type = ARG_PTR_TO_SOCKET,
};
+static int bpf_inode_storage_get_btf_ids[4];
+const struct bpf_func_proto bpf_inode_storage_get_proto = {
+ .func = bpf_inode_storage_get,
+ .gpl_only = false,
+ .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
+ .arg1_type = ARG_CONST_MAP_PTR,
+ .arg2_type = ARG_PTR_TO_BTF_ID,
+ .arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
+ .arg4_type = ARG_ANYTHING,
+ .btf_id = bpf_inode_storage_get_btf_ids,
+};
+
+static int bpf_inode_storage_delete_btf_ids[2];
+const struct bpf_func_proto bpf_inode_storage_delete_proto = {
+ .func = bpf_sk_storage_delete,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_CONST_MAP_PTR,
+ .arg2_type = ARG_PTR_TO_BTF_ID,
+ .btf_id = bpf_inode_storage_delete_btf_ids,
+};
+
struct bpf_sk_storage_diag {
u32 nr_maps;
struct bpf_map *maps[];
@@ -768,7 +768,8 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf,
if (map->map_type != BPF_MAP_TYPE_HASH &&
map->map_type != BPF_MAP_TYPE_ARRAY &&
map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
- map->map_type != BPF_MAP_TYPE_SK_STORAGE)
+ map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_INODE_STORAGE)
return -ENOTSUPP;
if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
map->value_size) {
@@ -4090,6 +4090,11 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
func_id != BPF_FUNC_sk_storage_delete)
goto error;
break;
+ case BPF_MAP_TYPE_INODE_STORAGE:
+ if (func_id != BPF_FUNC_inode_storage_get &&
+ func_id != BPF_FUNC_inode_storage_delete)
+ goto error;
+ break;
default:
break;
}
@@ -4163,6 +4168,11 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
if (map->map_type != BPF_MAP_TYPE_SK_STORAGE)
goto error;
break;
+ case BPF_FUNC_inode_storage_get:
+ case BPF_FUNC_inode_storage_delete:
+ if (map->map_type != BPF_MAP_TYPE_INODE_STORAGE)
+ goto error;
+ break;
default:
break;
}
@@ -3,6 +3,7 @@
/*
* Copyright (C) 2020 Google LLC.
*/
+#include <linux/bpf_local_storage.h>
#include <linux/lsm_hooks.h>
#include <linux/bpf_lsm.h>
@@ -11,6 +12,7 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(NAME, bpf_lsm_##NAME),
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
+ LSM_HOOK_INIT(inode_free_security, bpf_inode_storage_free),
};
static int __init bpf_lsm_init(void)
@@ -20,7 +22,12 @@ static int __init bpf_lsm_init(void)
return 0;
}
+struct lsm_blob_sizes bpf_lsm_blob_sizes __lsm_ro_after_init = {
+ .lbs_inode = sizeof(struct bpf_storage_blob),
+};
+
DEFINE_LSM(bpf) = {
.name = "bpf",
.init = bpf_lsm_init,
+ .blobs = &bpf_lsm_blob_sizes
};
@@ -49,6 +49,7 @@ const char * const map_type_name[] = {
[BPF_MAP_TYPE_STACK] = "stack",
[BPF_MAP_TYPE_SK_STORAGE] = "sk_storage",
[BPF_MAP_TYPE_STRUCT_OPS] = "struct_ops",
+ [BPF_MAP_TYPE_INODE_STORAGE] = "inode_storage",
};
const size_t map_type_name_size = ARRAY_SIZE(map_type_name);
@@ -148,6 +148,7 @@ enum bpf_map_type {
BPF_MAP_TYPE_DEVMAP_HASH,
BPF_MAP_TYPE_STRUCT_OPS,
BPF_MAP_TYPE_RINGBUF,
+ BPF_MAP_TYPE_INODE_STORAGE,
};
/* Note that tracing related programs such as
@@ -3252,6 +3253,41 @@ union bpf_attr {
* case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
* is returned or the error code -EACCES in case the skb is not
* subject to CHECKSUM_UNNECESSARY.
+ * void *bpf_inode_storage_get(struct bpf_map *map, void *inode, void *value, u64 flags)
+ * Description
+ * Get a bpf_local_storage from an *inode*.
+ *
+ * Logically, it could be thought of as getting the value from
+ * a *map* with *inode* as the **key**. From this
+ * perspective, the usage is not much different from
+ * **bpf_map_lookup_elem**\ (*map*, **&**\ *inode*) except this
+ * helper enforces the key must be an inode and the map must also
+ * be a **BPF_MAP_TYPE_INODE_STORAGE**.
+ *
+ * Underneath, the value is stored locally at *inode* instead of
+ * the *map*. The *map* is used as the bpf-local-storage
+ * "type". The bpf-local-storage "type" (i.e. the *map*) is
+ * searched against all bpf_local_storage residing at *inode*.
+ *
+ * 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_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
+ * A bpf_local_storage pointer is returned on success.
+ *
+ * **NULL** if not found or there was an error in adding
+ * a new bpf_local_storage.
+ *
+ * int bpf_inode_storage_delete(struct bpf_map *map, void *inode)
+ * Description
+ * Delete a bpf_local_storage from an *inode*.
+ * Return
+ * 0 on success.
+ *
+ * **-ENOENT** if the bpf_local_storage cannot be found.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3389,7 +3425,9 @@ union bpf_attr {
FN(ringbuf_submit), \
FN(ringbuf_discard), \
FN(ringbuf_query), \
- FN(csum_level),
+ FN(csum_level), \
+ FN(inode_storage_get), \
+ FN(inode_storage_delete),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
@@ -170,7 +170,7 @@ int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
return btf_fd;
}
-static int load_sk_storage_btf(void)
+static int load_local_storage_btf(void)
{
const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
/* struct bpf_spin_lock {
@@ -229,12 +229,13 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
key_size = 0;
break;
case BPF_MAP_TYPE_SK_STORAGE:
+ case BPF_MAP_TYPE_INODE_STORAGE:
btf_key_type_id = 1;
btf_value_type_id = 3;
value_size = 8;
max_entries = 0;
map_flags = BPF_F_NO_PREALLOC;
- btf_fd = load_sk_storage_btf();
+ btf_fd = load_local_storage_btf();
if (btf_fd < 0)
return false;
break;