release/src-rt-6.x.4708/linux/linux-2.6.36/fs/ceph/auth_none.c

   1
   2 #include "ceph_debug.h"
   3
   4 #include <linux/err.h>
   5 #include <linux/module.h>
   6 #include <linux/random.h>
   7 #include <linux/slab.h>
   8
   9 #include "auth_none.h"
  10 #include "auth.h"
  11 #include "decode.h"
  12
  13 static void reset(struct ceph_auth_client *ac)
  14 {
  15         struct ceph_auth_none_info *xi = ac->private;
  16
  17         xi->starting = true;
  18         xi->built_authorizer = false;
  19 }
  20
  21 static void destroy(struct ceph_auth_client *ac)
  22 {
  23         kfree(ac->private);
  24         ac->private = NULL;
  25 }
  26
  27 static int is_authenticated(struct ceph_auth_client *ac)
  28 {
  29         struct ceph_auth_none_info *xi = ac->private;
  30
  31         return !xi->starting;
  32 }
  33
  34 static int should_authenticate(struct ceph_auth_client *ac)
  35 {
  36         struct ceph_auth_none_info *xi = ac->private;
  37
  38         return xi->starting;
  39 }
  40
  41 /*
  42  * the generic auth code decode the global_id, and we carry no actual
  43  * authenticate state, so nothing happens here.
  44  */
  45 static int handle_reply(struct ceph_auth_client *ac, int result,
  46                         void *buf, void *end)
  47 {
  48         struct ceph_auth_none_info *xi = ac->private;
  49
  50         xi->starting = false;
  51         return result;
  52 }
  53
  54 /*
  55  * build an 'authorizer' with our entity_name and global_id.  we can
  56  * reuse a single static copy since it is identical for all services
  57  * we connect to.
  58  */
  59 static int ceph_auth_none_create_authorizer(
  60         struct ceph_auth_client *ac, int peer_type,
  61         struct ceph_authorizer **a,
  62         void **buf, size_t *len,
  63         void **reply_buf, size_t *reply_len)
  64 {
  65         struct ceph_auth_none_info *ai = ac->private;
  66         struct ceph_none_authorizer *au = &ai->au;
  67         void *p, *end;
  68         int ret;
  69
  70         if (!ai->built_authorizer) {
  71                 p = au->buf;
  72                 end = p + sizeof(au->buf);
  73                 ceph_encode_8(&p, 1);
  74                 ret = ceph_entity_name_encode(ac->name, &p, end - 8);
  75                 if (ret < 0)
  76                         goto bad;
  77                 ceph_decode_need(&p, end, sizeof(u64), bad2);
  78                 ceph_encode_64(&p, ac->global_id);
  79                 au->buf_len = p - (void *)au->buf;
  80                 ai->built_authorizer = true;
  81                 dout("built authorizer len %d\n", au->buf_len);
  82         }
  83
  84         *a = (struct ceph_authorizer *)au;
  85         *buf = au->buf;
  86         *len = au->buf_len;
  87         *reply_buf = au->reply_buf;
  88         *reply_len = sizeof(au->reply_buf);
  89         return 0;
  90
  91 bad2:
  92         ret = -ERANGE;
  93 bad:
  94         return ret;
  95 }
  96
  97 static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
  98                                       struct ceph_authorizer *a)
  99 {
 100         /* nothing to do */
 101 }
 102
 103 static const struct ceph_auth_client_ops ceph_auth_none_ops = {
 104         .name = "none",
 105         .reset = reset,
 106         .destroy = destroy,
 107         .is_authenticated = is_authenticated,
 108         .should_authenticate = should_authenticate,
 109         .handle_reply = handle_reply,
 110         .create_authorizer = ceph_auth_none_create_authorizer,
 111         .destroy_authorizer = ceph_auth_none_destroy_authorizer,
 112 };
 113
 114 int ceph_auth_none_init(struct ceph_auth_client *ac)
 115 {
 116         struct ceph_auth_none_info *xi;
 117
 118         dout("ceph_auth_none_init %p\n", ac);
 119         xi = kzalloc(sizeof(*xi), GFP_NOFS);
 120         if (!xi)
 121                 return -ENOMEM;
 122
 123         xi->starting = true;
 124         xi->built_authorizer = false;
 125
 126         ac->protocol = CEPH_AUTH_NONE;
 127         ac->private = xi;
 128         ac->ops = &ceph_auth_none_ops;
 129         return 0;
 130 }