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887 lines
21 KiB
887 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/net/sunrpc/auth.c |
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* |
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* Generic RPC client authentication API. |
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* |
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* Copyright (C) 1996, Olaf Kirch <[email protected]> |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/cred.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/errno.h> |
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#include <linux/hash.h> |
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#include <linux/sunrpc/clnt.h> |
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#include <linux/sunrpc/gss_api.h> |
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#include <linux/spinlock.h> |
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#include <trace/events/sunrpc.h> |
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#define RPC_CREDCACHE_DEFAULT_HASHBITS (4) |
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struct rpc_cred_cache { |
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struct hlist_head *hashtable; |
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unsigned int hashbits; |
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spinlock_t lock; |
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}; |
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static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS; |
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static const struct rpc_authops __rcu *auth_flavors[RPC_AUTH_MAXFLAVOR] = { |
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[RPC_AUTH_NULL] = (const struct rpc_authops __force __rcu *)&authnull_ops, |
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[RPC_AUTH_UNIX] = (const struct rpc_authops __force __rcu *)&authunix_ops, |
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NULL, /* others can be loadable modules */ |
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}; |
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static LIST_HEAD(cred_unused); |
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static unsigned long number_cred_unused; |
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static struct cred machine_cred = { |
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.usage = ATOMIC_INIT(1), |
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#ifdef CONFIG_DEBUG_CREDENTIALS |
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.magic = CRED_MAGIC, |
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#endif |
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}; |
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/* |
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* Return the machine_cred pointer to be used whenever |
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* the a generic machine credential is needed. |
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*/ |
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const struct cred *rpc_machine_cred(void) |
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{ |
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return &machine_cred; |
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} |
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EXPORT_SYMBOL_GPL(rpc_machine_cred); |
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#define MAX_HASHTABLE_BITS (14) |
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static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp) |
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{ |
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unsigned long num; |
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unsigned int nbits; |
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int ret; |
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if (!val) |
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goto out_inval; |
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ret = kstrtoul(val, 0, &num); |
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if (ret) |
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goto out_inval; |
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nbits = fls(num - 1); |
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if (nbits > MAX_HASHTABLE_BITS || nbits < 2) |
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goto out_inval; |
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*(unsigned int *)kp->arg = nbits; |
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return 0; |
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out_inval: |
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return -EINVAL; |
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} |
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static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp) |
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{ |
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unsigned int nbits; |
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nbits = *(unsigned int *)kp->arg; |
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return sprintf(buffer, "%u\n", 1U << nbits); |
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} |
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#define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int); |
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static const struct kernel_param_ops param_ops_hashtbl_sz = { |
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.set = param_set_hashtbl_sz, |
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.get = param_get_hashtbl_sz, |
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}; |
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module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); |
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MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); |
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static unsigned long auth_max_cred_cachesize = ULONG_MAX; |
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module_param(auth_max_cred_cachesize, ulong, 0644); |
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MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size"); |
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static u32 |
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pseudoflavor_to_flavor(u32 flavor) { |
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if (flavor > RPC_AUTH_MAXFLAVOR) |
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return RPC_AUTH_GSS; |
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return flavor; |
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} |
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int |
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rpcauth_register(const struct rpc_authops *ops) |
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{ |
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const struct rpc_authops *old; |
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rpc_authflavor_t flavor; |
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if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
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return -EINVAL; |
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old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], NULL, ops); |
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if (old == NULL || old == ops) |
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return 0; |
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return -EPERM; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_register); |
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int |
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rpcauth_unregister(const struct rpc_authops *ops) |
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{ |
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const struct rpc_authops *old; |
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rpc_authflavor_t flavor; |
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if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
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return -EINVAL; |
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old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], ops, NULL); |
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if (old == ops || old == NULL) |
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return 0; |
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return -EPERM; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_unregister); |
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static const struct rpc_authops * |
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rpcauth_get_authops(rpc_authflavor_t flavor) |
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{ |
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const struct rpc_authops *ops; |
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if (flavor >= RPC_AUTH_MAXFLAVOR) |
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return NULL; |
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rcu_read_lock(); |
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ops = rcu_dereference(auth_flavors[flavor]); |
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if (ops == NULL) { |
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rcu_read_unlock(); |
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request_module("rpc-auth-%u", flavor); |
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rcu_read_lock(); |
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ops = rcu_dereference(auth_flavors[flavor]); |
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if (ops == NULL) |
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goto out; |
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} |
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if (!try_module_get(ops->owner)) |
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ops = NULL; |
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out: |
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rcu_read_unlock(); |
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return ops; |
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} |
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static void |
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rpcauth_put_authops(const struct rpc_authops *ops) |
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{ |
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module_put(ops->owner); |
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} |
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/** |
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* rpcauth_get_pseudoflavor - check if security flavor is supported |
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* @flavor: a security flavor |
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* @info: a GSS mech OID, quality of protection, and service value |
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* |
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* Verifies that an appropriate kernel module is available or already loaded. |
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* Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is |
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* not supported locally. |
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*/ |
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rpc_authflavor_t |
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rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info) |
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{ |
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const struct rpc_authops *ops = rpcauth_get_authops(flavor); |
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rpc_authflavor_t pseudoflavor; |
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if (!ops) |
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return RPC_AUTH_MAXFLAVOR; |
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pseudoflavor = flavor; |
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if (ops->info2flavor != NULL) |
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pseudoflavor = ops->info2flavor(info); |
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rpcauth_put_authops(ops); |
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return pseudoflavor; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor); |
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/** |
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* rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor |
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* @pseudoflavor: GSS pseudoflavor to match |
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* @info: rpcsec_gss_info structure to fill in |
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* |
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* Returns zero and fills in "info" if pseudoflavor matches a |
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* supported mechanism. |
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*/ |
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int |
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rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info) |
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{ |
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rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor); |
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const struct rpc_authops *ops; |
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int result; |
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ops = rpcauth_get_authops(flavor); |
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if (ops == NULL) |
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return -ENOENT; |
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result = -ENOENT; |
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if (ops->flavor2info != NULL) |
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result = ops->flavor2info(pseudoflavor, info); |
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rpcauth_put_authops(ops); |
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return result; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); |
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struct rpc_auth * |
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rpcauth_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
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{ |
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struct rpc_auth *auth = ERR_PTR(-EINVAL); |
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const struct rpc_authops *ops; |
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u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); |
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ops = rpcauth_get_authops(flavor); |
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if (ops == NULL) |
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goto out; |
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auth = ops->create(args, clnt); |
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rpcauth_put_authops(ops); |
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if (IS_ERR(auth)) |
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return auth; |
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if (clnt->cl_auth) |
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rpcauth_release(clnt->cl_auth); |
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clnt->cl_auth = auth; |
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out: |
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return auth; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_create); |
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void |
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rpcauth_release(struct rpc_auth *auth) |
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{ |
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if (!refcount_dec_and_test(&auth->au_count)) |
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return; |
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auth->au_ops->destroy(auth); |
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} |
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static DEFINE_SPINLOCK(rpc_credcache_lock); |
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/* |
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* On success, the caller is responsible for freeing the reference |
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* held by the hashtable |
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*/ |
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static bool |
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rpcauth_unhash_cred_locked(struct rpc_cred *cred) |
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{ |
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if (!test_and_clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
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return false; |
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hlist_del_rcu(&cred->cr_hash); |
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return true; |
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} |
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static bool |
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rpcauth_unhash_cred(struct rpc_cred *cred) |
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{ |
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spinlock_t *cache_lock; |
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bool ret; |
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if (!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
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return false; |
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cache_lock = &cred->cr_auth->au_credcache->lock; |
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spin_lock(cache_lock); |
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ret = rpcauth_unhash_cred_locked(cred); |
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spin_unlock(cache_lock); |
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return ret; |
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} |
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/* |
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* Initialize RPC credential cache |
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*/ |
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int |
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rpcauth_init_credcache(struct rpc_auth *auth) |
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{ |
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struct rpc_cred_cache *new; |
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unsigned int hashsize; |
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new = kmalloc(sizeof(*new), GFP_KERNEL); |
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if (!new) |
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goto out_nocache; |
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new->hashbits = auth_hashbits; |
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hashsize = 1U << new->hashbits; |
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new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL); |
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if (!new->hashtable) |
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goto out_nohashtbl; |
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spin_lock_init(&new->lock); |
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auth->au_credcache = new; |
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return 0; |
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out_nohashtbl: |
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kfree(new); |
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out_nocache: |
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return -ENOMEM; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_init_credcache); |
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char * |
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rpcauth_stringify_acceptor(struct rpc_cred *cred) |
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{ |
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if (!cred->cr_ops->crstringify_acceptor) |
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return NULL; |
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return cred->cr_ops->crstringify_acceptor(cred); |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor); |
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/* |
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* Destroy a list of credentials |
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*/ |
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static inline |
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void rpcauth_destroy_credlist(struct list_head *head) |
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{ |
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struct rpc_cred *cred; |
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while (!list_empty(head)) { |
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cred = list_entry(head->next, struct rpc_cred, cr_lru); |
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list_del_init(&cred->cr_lru); |
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put_rpccred(cred); |
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} |
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} |
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static void |
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rpcauth_lru_add_locked(struct rpc_cred *cred) |
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{ |
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if (!list_empty(&cred->cr_lru)) |
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return; |
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number_cred_unused++; |
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list_add_tail(&cred->cr_lru, &cred_unused); |
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} |
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static void |
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rpcauth_lru_add(struct rpc_cred *cred) |
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{ |
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if (!list_empty(&cred->cr_lru)) |
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return; |
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spin_lock(&rpc_credcache_lock); |
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rpcauth_lru_add_locked(cred); |
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spin_unlock(&rpc_credcache_lock); |
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} |
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static void |
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rpcauth_lru_remove_locked(struct rpc_cred *cred) |
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{ |
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if (list_empty(&cred->cr_lru)) |
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return; |
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number_cred_unused--; |
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list_del_init(&cred->cr_lru); |
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} |
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static void |
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rpcauth_lru_remove(struct rpc_cred *cred) |
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{ |
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if (list_empty(&cred->cr_lru)) |
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return; |
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spin_lock(&rpc_credcache_lock); |
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rpcauth_lru_remove_locked(cred); |
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spin_unlock(&rpc_credcache_lock); |
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} |
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/* |
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* Clear the RPC credential cache, and delete those credentials |
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* that are not referenced. |
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*/ |
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void |
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rpcauth_clear_credcache(struct rpc_cred_cache *cache) |
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{ |
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LIST_HEAD(free); |
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struct hlist_head *head; |
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struct rpc_cred *cred; |
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unsigned int hashsize = 1U << cache->hashbits; |
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int i; |
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spin_lock(&rpc_credcache_lock); |
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spin_lock(&cache->lock); |
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for (i = 0; i < hashsize; i++) { |
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head = &cache->hashtable[i]; |
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while (!hlist_empty(head)) { |
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cred = hlist_entry(head->first, struct rpc_cred, cr_hash); |
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rpcauth_unhash_cred_locked(cred); |
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/* Note: We now hold a reference to cred */ |
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rpcauth_lru_remove_locked(cred); |
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list_add_tail(&cred->cr_lru, &free); |
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} |
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} |
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spin_unlock(&cache->lock); |
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spin_unlock(&rpc_credcache_lock); |
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rpcauth_destroy_credlist(&free); |
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} |
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/* |
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* Destroy the RPC credential cache |
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*/ |
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void |
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rpcauth_destroy_credcache(struct rpc_auth *auth) |
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{ |
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struct rpc_cred_cache *cache = auth->au_credcache; |
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if (cache) { |
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auth->au_credcache = NULL; |
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rpcauth_clear_credcache(cache); |
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kfree(cache->hashtable); |
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kfree(cache); |
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} |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); |
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#define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) |
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/* |
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* Remove stale credentials. Avoid sleeping inside the loop. |
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*/ |
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static long |
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rpcauth_prune_expired(struct list_head *free, int nr_to_scan) |
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{ |
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struct rpc_cred *cred, *next; |
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unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; |
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long freed = 0; |
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list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { |
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if (nr_to_scan-- == 0) |
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break; |
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if (refcount_read(&cred->cr_count) > 1) { |
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rpcauth_lru_remove_locked(cred); |
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continue; |
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} |
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/* |
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* Enforce a 60 second garbage collection moratorium |
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* Note that the cred_unused list must be time-ordered. |
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*/ |
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if (!time_in_range(cred->cr_expire, expired, jiffies)) |
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continue; |
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if (!rpcauth_unhash_cred(cred)) |
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continue; |
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rpcauth_lru_remove_locked(cred); |
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freed++; |
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list_add_tail(&cred->cr_lru, free); |
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} |
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return freed ? freed : SHRINK_STOP; |
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} |
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static unsigned long |
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rpcauth_cache_do_shrink(int nr_to_scan) |
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{ |
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LIST_HEAD(free); |
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unsigned long freed; |
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spin_lock(&rpc_credcache_lock); |
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freed = rpcauth_prune_expired(&free, nr_to_scan); |
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spin_unlock(&rpc_credcache_lock); |
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rpcauth_destroy_credlist(&free); |
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return freed; |
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} |
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/* |
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* Run memory cache shrinker. |
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*/ |
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static unsigned long |
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rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
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{ |
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if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
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return SHRINK_STOP; |
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/* nothing left, don't come back */ |
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if (list_empty(&cred_unused)) |
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return SHRINK_STOP; |
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return rpcauth_cache_do_shrink(sc->nr_to_scan); |
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} |
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|
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static unsigned long |
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rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
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{ |
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return number_cred_unused * sysctl_vfs_cache_pressure / 100; |
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} |
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static void |
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rpcauth_cache_enforce_limit(void) |
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{ |
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unsigned long diff; |
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unsigned int nr_to_scan; |
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if (number_cred_unused <= auth_max_cred_cachesize) |
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return; |
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diff = number_cred_unused - auth_max_cred_cachesize; |
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nr_to_scan = 100; |
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if (diff < nr_to_scan) |
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nr_to_scan = diff; |
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rpcauth_cache_do_shrink(nr_to_scan); |
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} |
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|
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/* |
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* Look up a process' credentials in the authentication cache |
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*/ |
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struct rpc_cred * |
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rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, |
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int flags, gfp_t gfp) |
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{ |
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LIST_HEAD(free); |
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struct rpc_cred_cache *cache = auth->au_credcache; |
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struct rpc_cred *cred = NULL, |
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*entry, *new; |
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unsigned int nr; |
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nr = auth->au_ops->hash_cred(acred, cache->hashbits); |
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rcu_read_lock(); |
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hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) { |
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if (!entry->cr_ops->crmatch(acred, entry, flags)) |
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continue; |
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cred = get_rpccred(entry); |
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if (cred) |
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break; |
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} |
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rcu_read_unlock(); |
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if (cred != NULL) |
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goto found; |
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new = auth->au_ops->crcreate(auth, acred, flags, gfp); |
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if (IS_ERR(new)) { |
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cred = new; |
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goto out; |
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} |
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|
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spin_lock(&cache->lock); |
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hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) { |
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if (!entry->cr_ops->crmatch(acred, entry, flags)) |
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continue; |
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cred = get_rpccred(entry); |
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if (cred) |
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break; |
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} |
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if (cred == NULL) { |
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cred = new; |
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set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); |
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refcount_inc(&cred->cr_count); |
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hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]); |
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} else |
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list_add_tail(&new->cr_lru, &free); |
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spin_unlock(&cache->lock); |
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rpcauth_cache_enforce_limit(); |
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found: |
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if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
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cred->cr_ops->cr_init != NULL && |
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!(flags & RPCAUTH_LOOKUP_NEW)) { |
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int res = cred->cr_ops->cr_init(auth, cred); |
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if (res < 0) { |
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put_rpccred(cred); |
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cred = ERR_PTR(res); |
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} |
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} |
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rpcauth_destroy_credlist(&free); |
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out: |
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return cred; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache); |
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|
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struct rpc_cred * |
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rpcauth_lookupcred(struct rpc_auth *auth, int flags) |
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{ |
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struct auth_cred acred; |
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struct rpc_cred *ret; |
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const struct cred *cred = current_cred(); |
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|
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memset(&acred, 0, sizeof(acred)); |
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acred.cred = cred; |
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ret = auth->au_ops->lookup_cred(auth, &acred, flags); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(rpcauth_lookupcred); |
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|
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void |
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rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, |
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struct rpc_auth *auth, const struct rpc_credops *ops) |
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{ |
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INIT_HLIST_NODE(&cred->cr_hash); |
|
INIT_LIST_HEAD(&cred->cr_lru); |
|
refcount_set(&cred->cr_count, 1); |
|
cred->cr_auth = auth; |
|
cred->cr_flags = 0; |
|
cred->cr_ops = ops; |
|
cred->cr_expire = jiffies; |
|
cred->cr_cred = get_cred(acred->cred); |
|
} |
|
EXPORT_SYMBOL_GPL(rpcauth_init_cred); |
|
|
|
static struct rpc_cred * |
|
rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags) |
|
{ |
|
struct rpc_auth *auth = task->tk_client->cl_auth; |
|
struct auth_cred acred = { |
|
.cred = get_task_cred(&init_task), |
|
}; |
|
struct rpc_cred *ret; |
|
|
|
ret = auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
|
put_cred(acred.cred); |
|
return ret; |
|
} |
|
|
|
static struct rpc_cred * |
|
rpcauth_bind_machine_cred(struct rpc_task *task, int lookupflags) |
|
{ |
|
struct rpc_auth *auth = task->tk_client->cl_auth; |
|
struct auth_cred acred = { |
|
.principal = task->tk_client->cl_principal, |
|
.cred = init_task.cred, |
|
}; |
|
|
|
if (!acred.principal) |
|
return NULL; |
|
return auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
|
} |
|
|
|
static struct rpc_cred * |
|
rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags) |
|
{ |
|
struct rpc_auth *auth = task->tk_client->cl_auth; |
|
|
|
return rpcauth_lookupcred(auth, lookupflags); |
|
} |
|
|
|
static int |
|
rpcauth_bindcred(struct rpc_task *task, const struct cred *cred, int flags) |
|
{ |
|
struct rpc_rqst *req = task->tk_rqstp; |
|
struct rpc_cred *new = NULL; |
|
int lookupflags = 0; |
|
struct rpc_auth *auth = task->tk_client->cl_auth; |
|
struct auth_cred acred = { |
|
.cred = cred, |
|
}; |
|
|
|
if (flags & RPC_TASK_ASYNC) |
|
lookupflags |= RPCAUTH_LOOKUP_NEW; |
|
if (task->tk_op_cred) |
|
/* Task must use exactly this rpc_cred */ |
|
new = get_rpccred(task->tk_op_cred); |
|
else if (cred != NULL && cred != &machine_cred) |
|
new = auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
|
else if (cred == &machine_cred) |
|
new = rpcauth_bind_machine_cred(task, lookupflags); |
|
|
|
/* If machine cred couldn't be bound, try a root cred */ |
|
if (new) |
|
; |
|
else if (cred == &machine_cred || (flags & RPC_TASK_ROOTCREDS)) |
|
new = rpcauth_bind_root_cred(task, lookupflags); |
|
else if (flags & RPC_TASK_NULLCREDS) |
|
new = authnull_ops.lookup_cred(NULL, NULL, 0); |
|
else |
|
new = rpcauth_bind_new_cred(task, lookupflags); |
|
if (IS_ERR(new)) |
|
return PTR_ERR(new); |
|
put_rpccred(req->rq_cred); |
|
req->rq_cred = new; |
|
return 0; |
|
} |
|
|
|
void |
|
put_rpccred(struct rpc_cred *cred) |
|
{ |
|
if (cred == NULL) |
|
return; |
|
rcu_read_lock(); |
|
if (refcount_dec_and_test(&cred->cr_count)) |
|
goto destroy; |
|
if (refcount_read(&cred->cr_count) != 1 || |
|
!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
|
goto out; |
|
if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) { |
|
cred->cr_expire = jiffies; |
|
rpcauth_lru_add(cred); |
|
/* Race breaker */ |
|
if (unlikely(!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags))) |
|
rpcauth_lru_remove(cred); |
|
} else if (rpcauth_unhash_cred(cred)) { |
|
rpcauth_lru_remove(cred); |
|
if (refcount_dec_and_test(&cred->cr_count)) |
|
goto destroy; |
|
} |
|
out: |
|
rcu_read_unlock(); |
|
return; |
|
destroy: |
|
rcu_read_unlock(); |
|
cred->cr_ops->crdestroy(cred); |
|
} |
|
EXPORT_SYMBOL_GPL(put_rpccred); |
|
|
|
/** |
|
* rpcauth_marshcred - Append RPC credential to end of @xdr |
|
* @task: controlling RPC task |
|
* @xdr: xdr_stream containing initial portion of RPC Call header |
|
* |
|
* On success, an appropriate verifier is added to @xdr, @xdr is |
|
* updated to point past the verifier, and zero is returned. |
|
* Otherwise, @xdr is in an undefined state and a negative errno |
|
* is returned. |
|
*/ |
|
int rpcauth_marshcred(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
|
|
|
return ops->crmarshal(task, xdr); |
|
} |
|
|
|
/** |
|
* rpcauth_wrap_req_encode - XDR encode the RPC procedure |
|
* @task: controlling RPC task |
|
* @xdr: stream where on-the-wire bytes are to be marshalled |
|
* |
|
* On success, @xdr contains the encoded and wrapped message. |
|
* Otherwise, @xdr is in an undefined state. |
|
*/ |
|
int rpcauth_wrap_req_encode(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
kxdreproc_t encode = task->tk_msg.rpc_proc->p_encode; |
|
|
|
encode(task->tk_rqstp, xdr, task->tk_msg.rpc_argp); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(rpcauth_wrap_req_encode); |
|
|
|
/** |
|
* rpcauth_wrap_req - XDR encode and wrap the RPC procedure |
|
* @task: controlling RPC task |
|
* @xdr: stream where on-the-wire bytes are to be marshalled |
|
* |
|
* On success, @xdr contains the encoded and wrapped message, |
|
* and zero is returned. Otherwise, @xdr is in an undefined |
|
* state and a negative errno is returned. |
|
*/ |
|
int rpcauth_wrap_req(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
|
|
|
return ops->crwrap_req(task, xdr); |
|
} |
|
|
|
/** |
|
* rpcauth_checkverf - Validate verifier in RPC Reply header |
|
* @task: controlling RPC task |
|
* @xdr: xdr_stream containing RPC Reply header |
|
* |
|
* On success, @xdr is updated to point past the verifier and |
|
* zero is returned. Otherwise, @xdr is in an undefined state |
|
* and a negative errno is returned. |
|
*/ |
|
int |
|
rpcauth_checkverf(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
|
|
|
return ops->crvalidate(task, xdr); |
|
} |
|
|
|
/** |
|
* rpcauth_unwrap_resp_decode - Invoke XDR decode function |
|
* @task: controlling RPC task |
|
* @xdr: stream where the Reply message resides |
|
* |
|
* Returns zero on success; otherwise a negative errno is returned. |
|
*/ |
|
int |
|
rpcauth_unwrap_resp_decode(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
|
|
|
return decode(task->tk_rqstp, xdr, task->tk_msg.rpc_resp); |
|
} |
|
EXPORT_SYMBOL_GPL(rpcauth_unwrap_resp_decode); |
|
|
|
/** |
|
* rpcauth_unwrap_resp - Invoke unwrap and decode function for the cred |
|
* @task: controlling RPC task |
|
* @xdr: stream where the Reply message resides |
|
* |
|
* Returns zero on success; otherwise a negative errno is returned. |
|
*/ |
|
int |
|
rpcauth_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr) |
|
{ |
|
const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
|
|
|
return ops->crunwrap_resp(task, xdr); |
|
} |
|
|
|
bool |
|
rpcauth_xmit_need_reencode(struct rpc_task *task) |
|
{ |
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
|
|
|
if (!cred || !cred->cr_ops->crneed_reencode) |
|
return false; |
|
return cred->cr_ops->crneed_reencode(task); |
|
} |
|
|
|
int |
|
rpcauth_refreshcred(struct rpc_task *task) |
|
{ |
|
struct rpc_cred *cred; |
|
int err; |
|
|
|
cred = task->tk_rqstp->rq_cred; |
|
if (cred == NULL) { |
|
err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags); |
|
if (err < 0) |
|
goto out; |
|
cred = task->tk_rqstp->rq_cred; |
|
} |
|
|
|
err = cred->cr_ops->crrefresh(task); |
|
out: |
|
if (err < 0) |
|
task->tk_status = err; |
|
return err; |
|
} |
|
|
|
void |
|
rpcauth_invalcred(struct rpc_task *task) |
|
{ |
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
|
|
|
if (cred) |
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
|
} |
|
|
|
int |
|
rpcauth_uptodatecred(struct rpc_task *task) |
|
{ |
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
|
|
|
return cred == NULL || |
|
test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0; |
|
} |
|
|
|
static struct shrinker rpc_cred_shrinker = { |
|
.count_objects = rpcauth_cache_shrink_count, |
|
.scan_objects = rpcauth_cache_shrink_scan, |
|
.seeks = DEFAULT_SEEKS, |
|
}; |
|
|
|
int __init rpcauth_init_module(void) |
|
{ |
|
int err; |
|
|
|
err = rpc_init_authunix(); |
|
if (err < 0) |
|
goto out1; |
|
err = register_shrinker(&rpc_cred_shrinker); |
|
if (err < 0) |
|
goto out2; |
|
return 0; |
|
out2: |
|
rpc_destroy_authunix(); |
|
out1: |
|
return err; |
|
} |
|
|
|
void rpcauth_remove_module(void) |
|
{ |
|
rpc_destroy_authunix(); |
|
unregister_shrinker(&rpc_cred_shrinker); |
|
}
|
|
|