ia64/linux-2.6.18-xen.hg

view net/sunrpc/auth.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/auth.c
3 *
4 * Generic RPC client authentication API.
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/sunrpc/clnt.h>
15 #include <linux/spinlock.h>
17 #ifdef RPC_DEBUG
18 # define RPCDBG_FACILITY RPCDBG_AUTH
19 #endif
21 static struct rpc_authops * auth_flavors[RPC_AUTH_MAXFLAVOR] = {
22 &authnull_ops, /* AUTH_NULL */
23 &authunix_ops, /* AUTH_UNIX */
24 NULL, /* others can be loadable modules */
25 };
27 static u32
28 pseudoflavor_to_flavor(u32 flavor) {
29 if (flavor >= RPC_AUTH_MAXFLAVOR)
30 return RPC_AUTH_GSS;
31 return flavor;
32 }
34 int
35 rpcauth_register(struct rpc_authops *ops)
36 {
37 rpc_authflavor_t flavor;
39 if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
40 return -EINVAL;
41 if (auth_flavors[flavor] != NULL)
42 return -EPERM; /* what else? */
43 auth_flavors[flavor] = ops;
44 return 0;
45 }
47 int
48 rpcauth_unregister(struct rpc_authops *ops)
49 {
50 rpc_authflavor_t flavor;
52 if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
53 return -EINVAL;
54 if (auth_flavors[flavor] != ops)
55 return -EPERM; /* what else? */
56 auth_flavors[flavor] = NULL;
57 return 0;
58 }
60 struct rpc_auth *
61 rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
62 {
63 struct rpc_auth *auth;
64 struct rpc_authops *ops;
65 u32 flavor = pseudoflavor_to_flavor(pseudoflavor);
67 auth = ERR_PTR(-EINVAL);
68 if (flavor >= RPC_AUTH_MAXFLAVOR)
69 goto out;
71 /* FIXME - auth_flavors[] really needs an rw lock,
72 * and module refcounting. */
73 #ifdef CONFIG_KMOD
74 if ((ops = auth_flavors[flavor]) == NULL)
75 request_module("rpc-auth-%u", flavor);
76 #endif
77 if ((ops = auth_flavors[flavor]) == NULL)
78 goto out;
79 auth = ops->create(clnt, pseudoflavor);
80 if (IS_ERR(auth))
81 return auth;
82 if (clnt->cl_auth)
83 rpcauth_destroy(clnt->cl_auth);
84 clnt->cl_auth = auth;
86 out:
87 return auth;
88 }
90 void
91 rpcauth_destroy(struct rpc_auth *auth)
92 {
93 if (!atomic_dec_and_test(&auth->au_count))
94 return;
95 auth->au_ops->destroy(auth);
96 }
98 static DEFINE_SPINLOCK(rpc_credcache_lock);
100 /*
101 * Initialize RPC credential cache
102 */
103 int
104 rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
105 {
106 struct rpc_cred_cache *new;
107 int i;
109 new = kmalloc(sizeof(*new), GFP_KERNEL);
110 if (!new)
111 return -ENOMEM;
112 for (i = 0; i < RPC_CREDCACHE_NR; i++)
113 INIT_HLIST_HEAD(&new->hashtable[i]);
114 new->expire = expire;
115 new->nextgc = jiffies + (expire >> 1);
116 auth->au_credcache = new;
117 return 0;
118 }
120 /*
121 * Destroy a list of credentials
122 */
123 static inline
124 void rpcauth_destroy_credlist(struct hlist_head *head)
125 {
126 struct rpc_cred *cred;
128 while (!hlist_empty(head)) {
129 cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
130 hlist_del_init(&cred->cr_hash);
131 put_rpccred(cred);
132 }
133 }
135 /*
136 * Clear the RPC credential cache, and delete those credentials
137 * that are not referenced.
138 */
139 void
140 rpcauth_free_credcache(struct rpc_auth *auth)
141 {
142 struct rpc_cred_cache *cache = auth->au_credcache;
143 HLIST_HEAD(free);
144 struct hlist_node *pos, *next;
145 struct rpc_cred *cred;
146 int i;
148 spin_lock(&rpc_credcache_lock);
149 for (i = 0; i < RPC_CREDCACHE_NR; i++) {
150 hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
151 cred = hlist_entry(pos, struct rpc_cred, cr_hash);
152 __hlist_del(&cred->cr_hash);
153 hlist_add_head(&cred->cr_hash, &free);
154 }
155 }
156 spin_unlock(&rpc_credcache_lock);
157 rpcauth_destroy_credlist(&free);
158 }
160 static void
161 rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
162 {
163 if (atomic_read(&cred->cr_count) != 1)
164 return;
165 if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
166 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
167 if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
168 __hlist_del(&cred->cr_hash);
169 hlist_add_head(&cred->cr_hash, free);
170 }
171 }
173 /*
174 * Remove stale credentials. Avoid sleeping inside the loop.
175 */
176 static void
177 rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
178 {
179 struct rpc_cred_cache *cache = auth->au_credcache;
180 struct hlist_node *pos, *next;
181 struct rpc_cred *cred;
182 int i;
184 dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
185 for (i = 0; i < RPC_CREDCACHE_NR; i++) {
186 hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
187 cred = hlist_entry(pos, struct rpc_cred, cr_hash);
188 rpcauth_prune_expired(auth, cred, free);
189 }
190 }
191 cache->nextgc = jiffies + cache->expire;
192 }
194 /*
195 * Look up a process' credentials in the authentication cache
196 */
197 struct rpc_cred *
198 rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
199 int flags)
200 {
201 struct rpc_cred_cache *cache = auth->au_credcache;
202 HLIST_HEAD(free);
203 struct hlist_node *pos, *next;
204 struct rpc_cred *new = NULL,
205 *cred = NULL;
206 int nr = 0;
208 if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
209 nr = acred->uid & RPC_CREDCACHE_MASK;
210 retry:
211 spin_lock(&rpc_credcache_lock);
212 if (time_before(cache->nextgc, jiffies))
213 rpcauth_gc_credcache(auth, &free);
214 hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
215 struct rpc_cred *entry;
216 entry = hlist_entry(pos, struct rpc_cred, cr_hash);
217 if (entry->cr_ops->crmatch(acred, entry, flags)) {
218 hlist_del(&entry->cr_hash);
219 cred = entry;
220 break;
221 }
222 rpcauth_prune_expired(auth, entry, &free);
223 }
224 if (new) {
225 if (cred)
226 hlist_add_head(&new->cr_hash, &free);
227 else
228 cred = new;
229 }
230 if (cred) {
231 hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
232 get_rpccred(cred);
233 }
234 spin_unlock(&rpc_credcache_lock);
236 rpcauth_destroy_credlist(&free);
238 if (!cred) {
239 new = auth->au_ops->crcreate(auth, acred, flags);
240 if (!IS_ERR(new)) {
241 #ifdef RPC_DEBUG
242 new->cr_magic = RPCAUTH_CRED_MAGIC;
243 #endif
244 goto retry;
245 } else
246 cred = new;
247 } else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
248 && cred->cr_ops->cr_init != NULL
249 && !(flags & RPCAUTH_LOOKUP_NEW)) {
250 int res = cred->cr_ops->cr_init(auth, cred);
251 if (res < 0) {
252 put_rpccred(cred);
253 cred = ERR_PTR(res);
254 }
255 }
257 return (struct rpc_cred *) cred;
258 }
260 struct rpc_cred *
261 rpcauth_lookupcred(struct rpc_auth *auth, int flags)
262 {
263 struct auth_cred acred = {
264 .uid = current->fsuid,
265 .gid = current->fsgid,
266 .group_info = current->group_info,
267 };
268 struct rpc_cred *ret;
270 dprintk("RPC: looking up %s cred\n",
271 auth->au_ops->au_name);
272 get_group_info(acred.group_info);
273 ret = auth->au_ops->lookup_cred(auth, &acred, flags);
274 put_group_info(acred.group_info);
275 return ret;
276 }
278 struct rpc_cred *
279 rpcauth_bindcred(struct rpc_task *task)
280 {
281 struct rpc_auth *auth = task->tk_auth;
282 struct auth_cred acred = {
283 .uid = current->fsuid,
284 .gid = current->fsgid,
285 .group_info = current->group_info,
286 };
287 struct rpc_cred *ret;
288 int flags = 0;
290 dprintk("RPC: %4d looking up %s cred\n",
291 task->tk_pid, task->tk_auth->au_ops->au_name);
292 get_group_info(acred.group_info);
293 if (task->tk_flags & RPC_TASK_ROOTCREDS)
294 flags |= RPCAUTH_LOOKUP_ROOTCREDS;
295 ret = auth->au_ops->lookup_cred(auth, &acred, flags);
296 if (!IS_ERR(ret))
297 task->tk_msg.rpc_cred = ret;
298 else
299 task->tk_status = PTR_ERR(ret);
300 put_group_info(acred.group_info);
301 return ret;
302 }
304 void
305 rpcauth_holdcred(struct rpc_task *task)
306 {
307 dprintk("RPC: %4d holding %s cred %p\n",
308 task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
309 if (task->tk_msg.rpc_cred)
310 get_rpccred(task->tk_msg.rpc_cred);
311 }
313 void
314 put_rpccred(struct rpc_cred *cred)
315 {
316 cred->cr_expire = jiffies;
317 if (!atomic_dec_and_test(&cred->cr_count))
318 return;
319 cred->cr_ops->crdestroy(cred);
320 }
322 void
323 rpcauth_unbindcred(struct rpc_task *task)
324 {
325 struct rpc_cred *cred = task->tk_msg.rpc_cred;
327 dprintk("RPC: %4d releasing %s cred %p\n",
328 task->tk_pid, task->tk_auth->au_ops->au_name, cred);
330 put_rpccred(cred);
331 task->tk_msg.rpc_cred = NULL;
332 }
334 u32 *
335 rpcauth_marshcred(struct rpc_task *task, u32 *p)
336 {
337 struct rpc_cred *cred = task->tk_msg.rpc_cred;
339 dprintk("RPC: %4d marshaling %s cred %p\n",
340 task->tk_pid, task->tk_auth->au_ops->au_name, cred);
342 return cred->cr_ops->crmarshal(task, p);
343 }
345 u32 *
346 rpcauth_checkverf(struct rpc_task *task, u32 *p)
347 {
348 struct rpc_cred *cred = task->tk_msg.rpc_cred;
350 dprintk("RPC: %4d validating %s cred %p\n",
351 task->tk_pid, task->tk_auth->au_ops->au_name, cred);
353 return cred->cr_ops->crvalidate(task, p);
354 }
356 int
357 rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
358 u32 *data, void *obj)
359 {
360 struct rpc_cred *cred = task->tk_msg.rpc_cred;
362 dprintk("RPC: %4d using %s cred %p to wrap rpc data\n",
363 task->tk_pid, cred->cr_ops->cr_name, cred);
364 if (cred->cr_ops->crwrap_req)
365 return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
366 /* By default, we encode the arguments normally. */
367 return encode(rqstp, data, obj);
368 }
370 int
371 rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
372 u32 *data, void *obj)
373 {
374 struct rpc_cred *cred = task->tk_msg.rpc_cred;
376 dprintk("RPC: %4d using %s cred %p to unwrap rpc data\n",
377 task->tk_pid, cred->cr_ops->cr_name, cred);
378 if (cred->cr_ops->crunwrap_resp)
379 return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
380 data, obj);
381 /* By default, we decode the arguments normally. */
382 return decode(rqstp, data, obj);
383 }
385 int
386 rpcauth_refreshcred(struct rpc_task *task)
387 {
388 struct rpc_cred *cred = task->tk_msg.rpc_cred;
389 int err;
391 dprintk("RPC: %4d refreshing %s cred %p\n",
392 task->tk_pid, task->tk_auth->au_ops->au_name, cred);
394 err = cred->cr_ops->crrefresh(task);
395 if (err < 0)
396 task->tk_status = err;
397 return err;
398 }
400 void
401 rpcauth_invalcred(struct rpc_task *task)
402 {
403 dprintk("RPC: %4d invalidating %s cred %p\n",
404 task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
405 spin_lock(&rpc_credcache_lock);
406 if (task->tk_msg.rpc_cred)
407 task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
408 spin_unlock(&rpc_credcache_lock);
409 }
411 int
412 rpcauth_uptodatecred(struct rpc_task *task)
413 {
414 return !(task->tk_msg.rpc_cred) ||
415 (task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
416 }