err.no Git - linux-2.6/blob - net/sunrpc/auth_generic.c

   1 /*
   2  * Generic RPC credential
   3  *
   4  * Copyright (C) 2008, Trond Myklebust <Trond.Myklebust@netapp.com>
   5  */
   6
   7 #include <linux/err.h>
   8 #include <linux/types.h>
   9 #include <linux/module.h>
  10 #include <linux/sched.h>
  11 #include <linux/sunrpc/auth.h>
  12 #include <linux/sunrpc/clnt.h>
  13 #include <linux/sunrpc/debug.h>
  14 #include <linux/sunrpc/sched.h>
  15
  16 #ifdef RPC_DEBUG
  17 # define RPCDBG_FACILITY        RPCDBG_AUTH
  18 #endif
  19
  20 struct generic_cred {
  21         struct rpc_cred gc_base;
  22         struct auth_cred acred;
  23 };
  24
  25 static struct rpc_auth generic_auth;
  26 static struct rpc_cred_cache generic_cred_cache;
  27 static const struct rpc_credops generic_credops;
  28
  29 /*
  30  * Public call interface
  31  */
  32 struct rpc_cred *rpc_lookup_cred(void)
  33 {
  34         return rpcauth_lookupcred(&generic_auth, 0);
  35 }
  36 EXPORT_SYMBOL_GPL(rpc_lookup_cred);
  37
  38 /*
  39  * Lookup generic creds for current process
  40  */
  41 static struct rpc_cred *
  42 generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
  43 {
  44         return rpcauth_lookup_credcache(&generic_auth, acred, flags);
  45 }
  46
  47 static struct rpc_cred *
  48 generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
  49 {
  50         struct generic_cred *gcred;
  51
  52         gcred = kmalloc(sizeof(*gcred), GFP_KERNEL);
  53         if (gcred == NULL)
  54                 return ERR_PTR(-ENOMEM);
  55
  56         rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops);
  57         gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
  58
  59         gcred->acred.uid = acred->uid;
  60         gcred->acred.gid = acred->gid;
  61         gcred->acred.group_info = acred->group_info;
  62         if (gcred->acred.group_info != NULL)
  63                 get_group_info(gcred->acred.group_info);
  64
  65         dprintk("RPC:       allocated generic cred %p for uid %d gid %d\n",
  66                         gcred, acred->uid, acred->gid);
  67         return &gcred->gc_base;
  68 }
  69
  70 static void
  71 generic_free_cred(struct rpc_cred *cred)
  72 {
  73         struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
  74
  75         dprintk("RPC:       generic_free_cred %p\n", gcred);
  76         if (gcred->acred.group_info != NULL)
  77                 put_group_info(gcred->acred.group_info);
  78         kfree(gcred);
  79 }
  80
  81 static void
  82 generic_free_cred_callback(struct rcu_head *head)
  83 {
  84         struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu);
  85         generic_free_cred(cred);
  86 }
  87
  88 static void
  89 generic_destroy_cred(struct rpc_cred *cred)
  90 {
  91         call_rcu(&cred->cr_rcu, generic_free_cred_callback);
  92 }
  93
  94 /*
  95  * Match credentials against current process creds.
  96  */
  97 static int
  98 generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
  99 {
 100         struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
 101
 102         if (gcred->acred.uid != acred->uid ||
 103             gcred->acred.gid != acred->gid ||
 104             gcred->acred.group_info != acred->group_info)
 105                 return 0;
 106         return 1;
 107 }
 108
 109 void __init rpc_init_generic_auth(void)
 110 {
 111         spin_lock_init(&generic_cred_cache.lock);
 112 }
 113
 114 void __exit rpc_destroy_generic_auth(void)
 115 {
 116         rpcauth_clear_credcache(&generic_cred_cache);
 117 }
 118
 119 static struct rpc_cred_cache generic_cred_cache = {
 120         {{ NULL, },},
 121 };
 122
 123 static const struct rpc_authops generic_auth_ops = {
 124         .owner = THIS_MODULE,
 125 #ifdef RPC_DEBUG
 126         .au_name = "Generic",
 127 #endif
 128         .lookup_cred = generic_lookup_cred,
 129         .crcreate = generic_create_cred,
 130 };
 131
 132 static struct rpc_auth generic_auth = {
 133         .au_ops = &generic_auth_ops,
 134         .au_count = ATOMIC_INIT(0),
 135         .au_credcache = &generic_cred_cache,
 136 };
 137
 138 static const struct rpc_credops generic_credops = {
 139         .cr_name = "Generic cred",
 140         .crdestroy = generic_destroy_cred,
 141         .crmatch = generic_match,
 142 };