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.
15 #include "ccids/lib/tfrc.h"
17 static struct ccid_operations
*ccids
[] = {
19 #ifdef CONFIG_IP_DCCP_CCID3
24 static struct ccid_operations
*ccid_by_number(const u8 id
)
28 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++)
29 if (ccids
[i
]->ccid_id
== id
)
34 /* check that up to @array_len members in @ccid_array are supported */
35 bool ccid_support_check(u8
const *ccid_array
, u8 array_len
)
38 if (ccid_by_number(ccid_array
[--array_len
]) == NULL
)
44 * ccid_get_builtin_ccids - Populate a list of built-in CCIDs
45 * @ccid_array: pointer to copy into
46 * @array_len: value to return length into
47 * This function allocates memory - caller must see that it is freed after use.
49 int ccid_get_builtin_ccids(u8
**ccid_array
, u8
*array_len
)
51 *ccid_array
= kmalloc(ARRAY_SIZE(ccids
), gfp_any());
52 if (*ccid_array
== NULL
)
55 for (*array_len
= 0; *array_len
< ARRAY_SIZE(ccids
); *array_len
+= 1)
56 (*ccid_array
)[*array_len
] = ccids
[*array_len
]->ccid_id
;
60 int ccid_getsockopt_builtin_ccids(struct sock
*sk
, int len
,
61 char __user
*optval
, int __user
*optlen
)
63 u8
*ccid_array
, array_len
;
66 if (len
< ARRAY_SIZE(ccids
))
69 if (ccid_get_builtin_ccids(&ccid_array
, &array_len
))
72 if (put_user(array_len
, optlen
) ||
73 copy_to_user(optval
, ccid_array
, array_len
))
80 static struct kmem_cache
*ccid_kmem_cache_create(int obj_size
, char *slab_name_fmt
, const char *fmt
,...)
82 struct kmem_cache
*slab
;
86 vsnprintf(slab_name_fmt
, CCID_SLAB_NAME_LENGTH
, fmt
, args
);
89 slab
= kmem_cache_create(slab_name_fmt
, sizeof(struct ccid
) + obj_size
, 0,
90 SLAB_HWCACHE_ALIGN
, NULL
);
94 static void ccid_kmem_cache_destroy(struct kmem_cache
*slab
)
97 kmem_cache_destroy(slab
);
100 static int ccid_activate(struct ccid_operations
*ccid_ops
)
104 ccid_ops
->ccid_hc_rx_slab
=
105 ccid_kmem_cache_create(ccid_ops
->ccid_hc_rx_obj_size
,
106 ccid_ops
->ccid_hc_rx_slab_name
,
109 if (ccid_ops
->ccid_hc_rx_slab
== NULL
)
112 ccid_ops
->ccid_hc_tx_slab
=
113 ccid_kmem_cache_create(ccid_ops
->ccid_hc_tx_obj_size
,
114 ccid_ops
->ccid_hc_tx_slab_name
,
117 if (ccid_ops
->ccid_hc_tx_slab
== NULL
)
118 goto out_free_rx_slab
;
120 pr_info("CCID: Activated CCID %d (%s)\n",
121 ccid_ops
->ccid_id
, ccid_ops
->ccid_name
);
126 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_rx_slab
);
127 ccid_ops
->ccid_hc_rx_slab
= NULL
;
131 static void ccid_deactivate(struct ccid_operations
*ccid_ops
)
133 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_tx_slab
);
134 ccid_ops
->ccid_hc_tx_slab
= NULL
;
135 ccid_kmem_cache_destroy(ccid_ops
->ccid_hc_rx_slab
);
136 ccid_ops
->ccid_hc_rx_slab
= NULL
;
138 pr_info("CCID: Deactivated CCID %d (%s)\n",
139 ccid_ops
->ccid_id
, ccid_ops
->ccid_name
);
142 struct ccid
*ccid_new(const u8 id
, struct sock
*sk
, bool rx
)
144 struct ccid_operations
*ccid_ops
= ccid_by_number(id
);
145 struct ccid
*ccid
= NULL
;
147 if (ccid_ops
== NULL
)
150 ccid
= kmem_cache_alloc(rx
? ccid_ops
->ccid_hc_rx_slab
:
151 ccid_ops
->ccid_hc_tx_slab
, gfp_any());
154 ccid
->ccid_ops
= ccid_ops
;
156 memset(ccid
+ 1, 0, ccid_ops
->ccid_hc_rx_obj_size
);
157 if (ccid
->ccid_ops
->ccid_hc_rx_init
!= NULL
&&
158 ccid
->ccid_ops
->ccid_hc_rx_init(ccid
, sk
) != 0)
161 memset(ccid
+ 1, 0, ccid_ops
->ccid_hc_tx_obj_size
);
162 if (ccid
->ccid_ops
->ccid_hc_tx_init
!= NULL
&&
163 ccid
->ccid_ops
->ccid_hc_tx_init(ccid
, sk
) != 0)
169 kmem_cache_free(rx
? ccid_ops
->ccid_hc_rx_slab
:
170 ccid_ops
->ccid_hc_tx_slab
, ccid
);
175 void ccid_hc_rx_delete(struct ccid
*ccid
, struct sock
*sk
)
178 if (ccid
->ccid_ops
->ccid_hc_rx_exit
!= NULL
)
179 ccid
->ccid_ops
->ccid_hc_rx_exit(sk
);
180 kmem_cache_free(ccid
->ccid_ops
->ccid_hc_rx_slab
, ccid
);
184 void ccid_hc_tx_delete(struct ccid
*ccid
, struct sock
*sk
)
187 if (ccid
->ccid_ops
->ccid_hc_tx_exit
!= NULL
)
188 ccid
->ccid_ops
->ccid_hc_tx_exit(sk
);
189 kmem_cache_free(ccid
->ccid_ops
->ccid_hc_tx_slab
, ccid
);
193 int __init
ccid_initialize_builtins(void)
195 int i
, err
= tfrc_lib_init();
200 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++) {
201 err
= ccid_activate(ccids
[i
]);
203 goto unwind_registrations
;
207 unwind_registrations
:
209 ccid_deactivate(ccids
[i
]);
214 void ccid_cleanup_builtins(void)
218 for (i
= 0; i
< ARRAY_SIZE(ccids
); i
++)
219 ccid_deactivate(ccids
[i
]);