4 * An implementation of the DCCP protocol
5 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
16 static struct ccid_operations
*ccids
[] = {
18 #ifdef CONFIG_IP_DCCP_CCID3
23 static struct ccid_operations
*ccid_by_number(const u8 id
)
27 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++)
28 if (ccids
[i
]->ccid_id
== id
)
33 /* check that up to @array_len members in @ccid_array are supported */
34 bool ccid_support_check(u8
const *ccid_array
, u8 array_len
)
37 if (ccid_by_number(ccid_array
[--array_len
]) == NULL
)
43 * ccid_get_builtin_ccids - Populate a list of built-in CCIDs
44 * @ccid_array: pointer to copy into
45 * @array_len: value to return length into
46 * This function allocates memory - caller must see that it is freed after use.
48 int ccid_get_builtin_ccids(u8
**ccid_array
, u8
*array_len
)
50 *ccid_array
= kmalloc(ARRAY_SIZE(ccids
), gfp_any());
51 if (*ccid_array
== NULL
)
54 for (*array_len
= 0; *array_len
< ARRAY_SIZE(ccids
); *array_len
+= 1)
55 (*ccid_array
)[*array_len
] = ccids
[*array_len
]->ccid_id
;
59 int ccid_getsockopt_builtin_ccids(struct sock
*sk
, int len
,
60 char __user
*optval
, int __user
*optlen
)
62 u8
*ccid_array
, array_len
;
65 if (len
< ARRAY_SIZE(ccids
))
68 if (ccid_get_builtin_ccids(&ccid_array
, &array_len
))
71 if (put_user(array_len
, optlen
) ||
72 copy_to_user(optval
, ccid_array
, array_len
))
79 static struct kmem_cache
*ccid_kmem_cache_create(int obj_size
, const char *fmt
,...)
81 struct kmem_cache
*slab
;
82 char slab_name_fmt
[32], *slab_name
;
86 vsnprintf(slab_name_fmt
, sizeof(slab_name_fmt
), fmt
, args
);
89 slab_name
= kstrdup(slab_name_fmt
, GFP_KERNEL
);
90 if (slab_name
== NULL
)
92 slab
= kmem_cache_create(slab_name
, sizeof(struct ccid
) + obj_size
, 0,
93 SLAB_HWCACHE_ALIGN
, NULL
);
99 static void ccid_kmem_cache_destroy(struct kmem_cache
*slab
)
102 const char *name
= kmem_cache_name(slab
);
104 kmem_cache_destroy(slab
);
109 static int ccid_activate(struct ccid_operations
*ccid_ops
)
113 ccid_ops
->ccid_hc_rx_slab
=
114 ccid_kmem_cache_create(ccid_ops
->ccid_hc_rx_obj_size
,
117 if (ccid_ops
->ccid_hc_rx_slab
== NULL
)
120 ccid_ops
->ccid_hc_tx_slab
=
121 ccid_kmem_cache_create(ccid_ops
->ccid_hc_tx_obj_size
,
124 if (ccid_ops
->ccid_hc_tx_slab
== NULL
)
125 goto out_free_rx_slab
;
127 pr_info("CCID: Activated CCID %d (%s)\n",
128 ccid_ops
->ccid_id
, ccid_ops
->ccid_name
);
133 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_rx_slab
);
134 ccid_ops
->ccid_hc_rx_slab
= NULL
;
138 static void ccid_deactivate(struct ccid_operations
*ccid_ops
)
140 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_tx_slab
);
141 ccid_ops
->ccid_hc_tx_slab
= NULL
;
142 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_rx_slab
);
143 ccid_ops
->ccid_hc_rx_slab
= NULL
;
145 pr_info("CCID: Deactivated CCID %d (%s)\n",
146 ccid_ops
->ccid_id
, ccid_ops
->ccid_name
);
149 struct ccid
*ccid_new(const u8 id
, struct sock
*sk
, bool rx
)
151 struct ccid_operations
*ccid_ops
= ccid_by_number(id
);
152 struct ccid
*ccid
= NULL
;
154 if (ccid_ops
== NULL
)
157 ccid
= kmem_cache_alloc(rx
? ccid_ops
->ccid_hc_rx_slab
:
158 ccid_ops
->ccid_hc_tx_slab
, gfp_any());
161 ccid
->ccid_ops
= ccid_ops
;
163 memset(ccid
+ 1, 0, ccid_ops
->ccid_hc_rx_obj_size
);
164 if (ccid
->ccid_ops
->ccid_hc_rx_init
!= NULL
&&
165 ccid
->ccid_ops
->ccid_hc_rx_init(ccid
, sk
) != 0)
168 memset(ccid
+ 1, 0, ccid_ops
->ccid_hc_tx_obj_size
);
169 if (ccid
->ccid_ops
->ccid_hc_tx_init
!= NULL
&&
170 ccid
->ccid_ops
->ccid_hc_tx_init(ccid
, sk
) != 0)
176 kmem_cache_free(rx
? ccid_ops
->ccid_hc_rx_slab
:
177 ccid_ops
->ccid_hc_tx_slab
, ccid
);
182 void ccid_hc_rx_delete(struct ccid
*ccid
, struct sock
*sk
)
185 if (ccid
->ccid_ops
->ccid_hc_rx_exit
!= NULL
)
186 ccid
->ccid_ops
->ccid_hc_rx_exit(sk
);
187 kmem_cache_free(ccid
->ccid_ops
->ccid_hc_rx_slab
, ccid
);
191 void ccid_hc_tx_delete(struct ccid
*ccid
, struct sock
*sk
)
194 if (ccid
->ccid_ops
->ccid_hc_tx_exit
!= NULL
)
195 ccid
->ccid_ops
->ccid_hc_tx_exit(sk
);
196 kmem_cache_free(ccid
->ccid_ops
->ccid_hc_tx_slab
, ccid
);
200 int __init
ccid_initialize_builtins(void)
204 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++) {
205 err
= ccid_activate(ccids
[i
]);
207 goto unwind_registrations
;
211 unwind_registrations
:
213 ccid_deactivate(ccids
[i
]);
217 void ccid_cleanup_builtins(void)
221 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++)
222 ccid_deactivate(ccids
[i
]);
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