v4.19.13 snapshot.
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
new file mode 100644
index 0000000..58a6765
--- /dev/null
+++ b/include/linux/sunrpc/auth.h
@@ -0,0 +1,233 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/auth.h
+ *
+ * Declarations for the RPC client authentication machinery.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_AUTH_H
+#define _LINUX_SUNRPC_AUTH_H
+
+#ifdef __KERNEL__
+
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/xdr.h>
+
+#include <linux/atomic.h>
+#include <linux/rcupdate.h>
+#include <linux/uidgid.h>
+#include <linux/utsname.h>
+
+/*
+ * Maximum size of AUTH_NONE authentication information, in XDR words.
+ */
+#define NUL_CALLSLACK (4)
+#define NUL_REPLYSLACK (2)
+
+/*
+ * Size of the nodename buffer. RFC1831 specifies a hard limit of 255 bytes,
+ * but Linux hostnames are actually limited to __NEW_UTS_LEN bytes.
+ */
+#define UNX_MAXNODENAME __NEW_UTS_LEN
+#define UNX_CALLSLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
+#define UNX_NGROUPS 16
+
+struct rpcsec_gss_info;
+
+/* auth_cred ac_flags bits */
+enum {
+ RPC_CRED_KEY_EXPIRE_SOON = 1, /* underlying cred key will expire soon */
+ RPC_CRED_NOTIFY_TIMEOUT = 2, /* nofity generic cred when underlying
+ key will expire soon */
+};
+
+/* Work around the lack of a VFS credential */
+struct auth_cred {
+ kuid_t uid;
+ kgid_t gid;
+ struct group_info *group_info;
+ const char *principal;
+ unsigned long ac_flags;
+ unsigned char machine_cred : 1;
+};
+
+/*
+ * Client user credentials
+ */
+struct rpc_auth;
+struct rpc_credops;
+struct rpc_cred {
+ struct hlist_node cr_hash; /* hash chain */
+ struct list_head cr_lru; /* lru garbage collection */
+ struct rcu_head cr_rcu;
+ struct rpc_auth * cr_auth;
+ const struct rpc_credops *cr_ops;
+ unsigned long cr_expire; /* when to gc */
+ unsigned long cr_flags; /* various flags */
+ atomic_t cr_count; /* ref count */
+
+ kuid_t cr_uid;
+
+ /* per-flavor data */
+};
+#define RPCAUTH_CRED_NEW 0
+#define RPCAUTH_CRED_UPTODATE 1
+#define RPCAUTH_CRED_HASHED 2
+#define RPCAUTH_CRED_NEGATIVE 3
+
+/* rpc_auth au_flags */
+#define RPCAUTH_AUTH_NO_CRKEY_TIMEOUT 0x0001 /* underlying cred has no key timeout */
+
+/*
+ * Client authentication handle
+ */
+struct rpc_cred_cache;
+struct rpc_authops;
+struct rpc_auth {
+ unsigned int au_cslack; /* call cred size estimate */
+ /* guess at number of u32's auth adds before
+ * reply data; normally the verifier size: */
+ unsigned int au_rslack;
+ /* for gss, used to calculate au_rslack: */
+ unsigned int au_verfsize;
+
+ unsigned int au_flags; /* various flags */
+ const struct rpc_authops *au_ops; /* operations */
+ rpc_authflavor_t au_flavor; /* pseudoflavor (note may
+ * differ from the flavor in
+ * au_ops->au_flavor in gss
+ * case) */
+ atomic_t au_count; /* Reference counter */
+
+ struct rpc_cred_cache * au_credcache;
+ /* per-flavor data */
+};
+
+/* rpc_auth au_flags */
+#define RPCAUTH_AUTH_DATATOUCH 0x00000002
+
+struct rpc_auth_create_args {
+ rpc_authflavor_t pseudoflavor;
+ const char *target_name;
+};
+
+/* Flags for rpcauth_lookupcred() */
+#define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */
+#define RPCAUTH_LOOKUP_RCU 0x02 /* lock-less lookup */
+
+/*
+ * Client authentication ops
+ */
+struct rpc_authops {
+ struct module *owner;
+ rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */
+ char * au_name;
+ struct rpc_auth * (*create)(const struct rpc_auth_create_args *,
+ struct rpc_clnt *);
+ void (*destroy)(struct rpc_auth *);
+
+ int (*hash_cred)(struct auth_cred *, unsigned int);
+ struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
+ struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
+ int (*list_pseudoflavors)(rpc_authflavor_t *, int);
+ rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
+ int (*flavor2info)(rpc_authflavor_t,
+ struct rpcsec_gss_info *);
+ int (*key_timeout)(struct rpc_auth *,
+ struct rpc_cred *);
+};
+
+struct rpc_credops {
+ const char * cr_name; /* Name of the auth flavour */
+ int (*cr_init)(struct rpc_auth *, struct rpc_cred *);
+ void (*crdestroy)(struct rpc_cred *);
+
+ int (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
+ struct rpc_cred * (*crbind)(struct rpc_task *, struct rpc_cred *, int);
+ __be32 * (*crmarshal)(struct rpc_task *, __be32 *);
+ int (*crrefresh)(struct rpc_task *);
+ __be32 * (*crvalidate)(struct rpc_task *, __be32 *);
+ int (*crwrap_req)(struct rpc_task *, kxdreproc_t,
+ void *, __be32 *, void *);
+ int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
+ void *, __be32 *, void *);
+ int (*crkey_timeout)(struct rpc_cred *);
+ bool (*crkey_to_expire)(struct rpc_cred *);
+ char * (*crstringify_acceptor)(struct rpc_cred *);
+};
+
+extern const struct rpc_authops authunix_ops;
+extern const struct rpc_authops authnull_ops;
+
+int __init rpc_init_authunix(void);
+int __init rpc_init_generic_auth(void);
+int __init rpcauth_init_module(void);
+void rpcauth_remove_module(void);
+void rpc_destroy_generic_auth(void);
+void rpc_destroy_authunix(void);
+
+struct rpc_cred * rpc_lookup_cred(void);
+struct rpc_cred * rpc_lookup_cred_nonblock(void);
+struct rpc_cred * rpc_lookup_generic_cred(struct auth_cred *, int, gfp_t);
+struct rpc_cred * rpc_lookup_machine_cred(const char *service_name);
+int rpcauth_register(const struct rpc_authops *);
+int rpcauth_unregister(const struct rpc_authops *);
+struct rpc_auth * rpcauth_create(const struct rpc_auth_create_args *,
+ struct rpc_clnt *);
+void rpcauth_release(struct rpc_auth *);
+rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t,
+ struct rpcsec_gss_info *);
+int rpcauth_get_gssinfo(rpc_authflavor_t,
+ struct rpcsec_gss_info *);
+int rpcauth_list_flavors(rpc_authflavor_t *, int);
+struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
+void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
+struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
+struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int);
+void put_rpccred(struct rpc_cred *);
+__be32 * rpcauth_marshcred(struct rpc_task *, __be32 *);
+__be32 * rpcauth_checkverf(struct rpc_task *, __be32 *);
+int rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
+int rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
+int rpcauth_refreshcred(struct rpc_task *);
+void rpcauth_invalcred(struct rpc_task *);
+int rpcauth_uptodatecred(struct rpc_task *);
+int rpcauth_init_credcache(struct rpc_auth *);
+void rpcauth_destroy_credcache(struct rpc_auth *);
+void rpcauth_clear_credcache(struct rpc_cred_cache *);
+int rpcauth_key_timeout_notify(struct rpc_auth *,
+ struct rpc_cred *);
+bool rpcauth_cred_key_to_expire(struct rpc_auth *, struct rpc_cred *);
+char * rpcauth_stringify_acceptor(struct rpc_cred *);
+
+static inline
+struct rpc_cred * get_rpccred(struct rpc_cred *cred)
+{
+ if (cred != NULL)
+ atomic_inc(&cred->cr_count);
+ return cred;
+}
+
+/**
+ * get_rpccred_rcu - get a reference to a cred using rcu-protected pointer
+ * @cred: cred of which to take a reference
+ *
+ * In some cases, we may have a pointer to a credential to which we
+ * want to take a reference, but don't already have one. Because these
+ * objects are freed using RCU, we can access the cr_count while its
+ * on its way to destruction and only take a reference if it's not already
+ * zero.
+ */
+static inline struct rpc_cred *
+get_rpccred_rcu(struct rpc_cred *cred)
+{
+ if (atomic_inc_not_zero(&cred->cr_count))
+ return cred;
+ return NULL;
+}
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_SUNRPC_AUTH_H */