ia64/linux-2.6.18-xen.hg

view net/sunrpc/svcauth.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /*
2 * linux/net/sunrpc/svcauth.c
3 *
4 * The generic interface for RPC authentication on the server side.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 *
8 * CHANGES
9 * 19-Apr-2000 Chris Evans - Security fix
10 */
12 #include <linux/types.h>
13 #include <linux/sched.h>
14 #include <linux/module.h>
15 #include <linux/sunrpc/types.h>
16 #include <linux/sunrpc/xdr.h>
17 #include <linux/sunrpc/svcsock.h>
18 #include <linux/sunrpc/svcauth.h>
19 #include <linux/err.h>
20 #include <linux/hash.h>
22 #define RPCDBG_FACILITY RPCDBG_AUTH
25 /*
26 * Table of authenticators
27 */
28 extern struct auth_ops svcauth_null;
29 extern struct auth_ops svcauth_unix;
31 static DEFINE_SPINLOCK(authtab_lock);
32 static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = {
33 [0] = &svcauth_null,
34 [1] = &svcauth_unix,
35 };
37 int
38 svc_authenticate(struct svc_rqst *rqstp, u32 *authp)
39 {
40 rpc_authflavor_t flavor;
41 struct auth_ops *aops;
43 *authp = rpc_auth_ok;
45 flavor = ntohl(svc_getu32(&rqstp->rq_arg.head[0]));
47 dprintk("svc: svc_authenticate (%d)\n", flavor);
49 spin_lock(&authtab_lock);
50 if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor])
51 || !try_module_get(aops->owner)) {
52 spin_unlock(&authtab_lock);
53 *authp = rpc_autherr_badcred;
54 return SVC_DENIED;
55 }
56 spin_unlock(&authtab_lock);
58 rqstp->rq_authop = aops;
59 return aops->accept(rqstp, authp);
60 }
62 int svc_set_client(struct svc_rqst *rqstp)
63 {
64 return rqstp->rq_authop->set_client(rqstp);
65 }
67 /* A request, which was authenticated, has now executed.
68 * Time to finalise the the credentials and verifier
69 * and release and resources
70 */
71 int svc_authorise(struct svc_rqst *rqstp)
72 {
73 struct auth_ops *aops = rqstp->rq_authop;
74 int rv = 0;
76 rqstp->rq_authop = NULL;
78 if (aops) {
79 rv = aops->release(rqstp);
80 module_put(aops->owner);
81 }
82 return rv;
83 }
85 int
86 svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
87 {
88 int rv = -EINVAL;
89 spin_lock(&authtab_lock);
90 if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
91 authtab[flavor] = aops;
92 rv = 0;
93 }
94 spin_unlock(&authtab_lock);
95 return rv;
96 }
98 void
99 svc_auth_unregister(rpc_authflavor_t flavor)
100 {
101 spin_lock(&authtab_lock);
102 if (flavor < RPC_AUTH_MAXFLAVOR)
103 authtab[flavor] = NULL;
104 spin_unlock(&authtab_lock);
105 }
106 EXPORT_SYMBOL(svc_auth_unregister);
108 /**************************************************
109 * 'auth_domains' are stored in a hash table indexed by name.
110 * When the last reference to an 'auth_domain' is dropped,
111 * the object is unhashed and freed.
112 * If auth_domain_lookup fails to find an entry, it will return
113 * it's second argument 'new'. If this is non-null, it will
114 * have been atomically linked into the table.
115 */
117 #define DN_HASHBITS 6
118 #define DN_HASHMAX (1<<DN_HASHBITS)
119 #define DN_HASHMASK (DN_HASHMAX-1)
121 static struct hlist_head auth_domain_table[DN_HASHMAX];
122 static spinlock_t auth_domain_lock = SPIN_LOCK_UNLOCKED;
124 void auth_domain_put(struct auth_domain *dom)
125 {
126 if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {
127 hlist_del(&dom->hash);
128 dom->flavour->domain_release(dom);
129 }
130 }
132 struct auth_domain *
133 auth_domain_lookup(char *name, struct auth_domain *new)
134 {
135 struct auth_domain *hp;
136 struct hlist_head *head;
137 struct hlist_node *np;
139 head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
141 spin_lock(&auth_domain_lock);
143 hlist_for_each_entry(hp, np, head, hash) {
144 if (strcmp(hp->name, name)==0) {
145 kref_get(&hp->ref);
146 spin_unlock(&auth_domain_lock);
147 return hp;
148 }
149 }
150 if (new) {
151 hlist_add_head(&new->hash, head);
152 kref_get(&new->ref);
153 }
154 spin_unlock(&auth_domain_lock);
155 return new;
156 }
158 struct auth_domain *auth_domain_find(char *name)
159 {
160 return auth_domain_lookup(name, NULL);
161 }