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Linux/net/dccp/ccid.c

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  1 /*
  2  *  net/dccp/ccid.c
  3  *
  4  *  An implementation of the DCCP protocol
  5  *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  6  *
  7  *  CCID infrastructure
  8  *
  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.
 12  */
 13 
 14 #include <linux/slab.h>
 15 
 16 #include "ccid.h"
 17 #include "ccids/lib/tfrc.h"
 18 
 19 static struct ccid_operations *ccids[] = {
 20         &ccid2_ops,
 21 #ifdef CONFIG_IP_DCCP_CCID3
 22         &ccid3_ops,
 23 #endif
 24 };
 25 
 26 static struct ccid_operations *ccid_by_number(const u8 id)
 27 {
 28         int i;
 29 
 30         for (i = 0; i < ARRAY_SIZE(ccids); i++)
 31                 if (ccids[i]->ccid_id == id)
 32                         return ccids[i];
 33         return NULL;
 34 }
 35 
 36 /* check that up to @array_len members in @ccid_array are supported */
 37 bool ccid_support_check(u8 const *ccid_array, u8 array_len)
 38 {
 39         while (array_len > 0)
 40                 if (ccid_by_number(ccid_array[--array_len]) == NULL)
 41                         return false;
 42         return true;
 43 }
 44 
 45 /**
 46  * ccid_get_builtin_ccids  -  Populate a list of built-in CCIDs
 47  * @ccid_array: pointer to copy into
 48  * @array_len: value to return length into
 49  *
 50  * This function allocates memory - caller must see that it is freed after use.
 51  */
 52 int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
 53 {
 54         *ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any());
 55         if (*ccid_array == NULL)
 56                 return -ENOBUFS;
 57 
 58         for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1)
 59                 (*ccid_array)[*array_len] = ccids[*array_len]->ccid_id;
 60         return 0;
 61 }
 62 
 63 int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
 64                                   char __user *optval, int __user *optlen)
 65 {
 66         u8 *ccid_array, array_len;
 67         int err = 0;
 68 
 69         if (ccid_get_builtin_ccids(&ccid_array, &array_len))
 70                 return -ENOBUFS;
 71 
 72         if (put_user(array_len, optlen))
 73                 err = -EFAULT;
 74         else if (len > 0 && copy_to_user(optval, ccid_array,
 75                                          len > array_len ? array_len : len))
 76                 err = -EFAULT;
 77 
 78         kfree(ccid_array);
 79         return err;
 80 }
 81 
 82 static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...)
 83 {
 84         struct kmem_cache *slab;
 85         va_list args;
 86 
 87         va_start(args, fmt);
 88         vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args);
 89         va_end(args);
 90 
 91         slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0,
 92                                  SLAB_HWCACHE_ALIGN, NULL);
 93         return slab;
 94 }
 95 
 96 static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
 97 {
 98         if (slab != NULL)
 99                 kmem_cache_destroy(slab);
100 }
101 
102 static int ccid_activate(struct ccid_operations *ccid_ops)
103 {
104         int err = -ENOBUFS;
105 
106         ccid_ops->ccid_hc_rx_slab =
107                         ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size,
108                                                ccid_ops->ccid_hc_rx_slab_name,
109                                                "ccid%u_hc_rx_sock",
110                                                ccid_ops->ccid_id);
111         if (ccid_ops->ccid_hc_rx_slab == NULL)
112                 goto out;
113 
114         ccid_ops->ccid_hc_tx_slab =
115                         ccid_kmem_cache_create(ccid_ops->ccid_hc_tx_obj_size,
116                                                ccid_ops->ccid_hc_tx_slab_name,
117                                                "ccid%u_hc_tx_sock",
118                                                ccid_ops->ccid_id);
119         if (ccid_ops->ccid_hc_tx_slab == NULL)
120                 goto out_free_rx_slab;
121 
122         pr_info("DCCP: Activated CCID %d (%s)\n",
123                 ccid_ops->ccid_id, ccid_ops->ccid_name);
124         err = 0;
125 out:
126         return err;
127 out_free_rx_slab:
128         ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
129         ccid_ops->ccid_hc_rx_slab = NULL;
130         goto out;
131 }
132 
133 static void ccid_deactivate(struct ccid_operations *ccid_ops)
134 {
135         ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
136         ccid_ops->ccid_hc_tx_slab = NULL;
137         ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
138         ccid_ops->ccid_hc_rx_slab = NULL;
139 
140         pr_info("DCCP: Deactivated CCID %d (%s)\n",
141                 ccid_ops->ccid_id, ccid_ops->ccid_name);
142 }
143 
144 struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx)
145 {
146         struct ccid_operations *ccid_ops = ccid_by_number(id);
147         struct ccid *ccid = NULL;
148 
149         if (ccid_ops == NULL)
150                 goto out;
151 
152         ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
153                                      ccid_ops->ccid_hc_tx_slab, gfp_any());
154         if (ccid == NULL)
155                 goto out;
156         ccid->ccid_ops = ccid_ops;
157         if (rx) {
158                 memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size);
159                 if (ccid->ccid_ops->ccid_hc_rx_init != NULL &&
160                     ccid->ccid_ops->ccid_hc_rx_init(ccid, sk) != 0)
161                         goto out_free_ccid;
162         } else {
163                 memset(ccid + 1, 0, ccid_ops->ccid_hc_tx_obj_size);
164                 if (ccid->ccid_ops->ccid_hc_tx_init != NULL &&
165                     ccid->ccid_ops->ccid_hc_tx_init(ccid, sk) != 0)
166                         goto out_free_ccid;
167         }
168 out:
169         return ccid;
170 out_free_ccid:
171         kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
172                         ccid_ops->ccid_hc_tx_slab, ccid);
173         ccid = NULL;
174         goto out;
175 }
176 
177 void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
178 {
179         if (ccid != NULL) {
180                 if (ccid->ccid_ops->ccid_hc_rx_exit != NULL)
181                         ccid->ccid_ops->ccid_hc_rx_exit(sk);
182                 kmem_cache_free(ccid->ccid_ops->ccid_hc_rx_slab, ccid);
183         }
184 }
185 
186 void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
187 {
188         if (ccid != NULL) {
189                 if (ccid->ccid_ops->ccid_hc_tx_exit != NULL)
190                         ccid->ccid_ops->ccid_hc_tx_exit(sk);
191                 kmem_cache_free(ccid->ccid_ops->ccid_hc_tx_slab, ccid);
192         }
193 }
194 
195 int __init ccid_initialize_builtins(void)
196 {
197         int i, err = tfrc_lib_init();
198 
199         if (err)
200                 return err;
201 
202         for (i = 0; i < ARRAY_SIZE(ccids); i++) {
203                 err = ccid_activate(ccids[i]);
204                 if (err)
205                         goto unwind_registrations;
206         }
207         return 0;
208 
209 unwind_registrations:
210         while(--i >= 0)
211                 ccid_deactivate(ccids[i]);
212         tfrc_lib_exit();
213         return err;
214 }
215 
216 void ccid_cleanup_builtins(void)
217 {
218         int i;
219 
220         for (i = 0; i < ARRAY_SIZE(ccids); i++)
221                 ccid_deactivate(ccids[i]);
222         tfrc_lib_exit();
223 }
224 

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