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]);