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Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001/*
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
15
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070016#include "ccid.h"
Gerrit Renker129fa442009-01-04 21:45:33 -080017#include "ccids/lib/tfrc.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070018
Gerrit Renkerddebc972009-01-04 21:42:53 -080019static struct ccid_operations *ccids[] = {
20 &ccid2_ops,
21#ifdef CONFIG_IP_DCCP_CCID3
22 &ccid3_ops,
23#endif
24};
25
26static 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 */
37bool 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 * This function allocates memory - caller must see that it is freed after use.
50 */
51int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len)
52{
53 *ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any());
54 if (*ccid_array == NULL)
55 return -ENOBUFS;
56
57 for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1)
58 (*ccid_array)[*array_len] = ccids[*array_len]->ccid_id;
59 return 0;
60}
61
62int ccid_getsockopt_builtin_ccids(struct sock *sk, int len,
63 char __user *optval, int __user *optlen)
64{
65 u8 *ccid_array, array_len;
66 int err = 0;
67
Gerrit Renkerddebc972009-01-04 21:42:53 -080068 if (ccid_get_builtin_ccids(&ccid_array, &array_len))
69 return -ENOBUFS;
70
Gerrit Renker69a6a0b2010-02-07 20:20:28 +000071 if (put_user(array_len, optlen))
72 err = -EFAULT;
73 else if (len > 0 && copy_to_user(optval, ccid_array,
74 len > array_len ? array_len : len))
Gerrit Renkerddebc972009-01-04 21:42:53 -080075 err = -EFAULT;
76
77 kfree(ccid_array);
78 return err;
79}
80
Neil Hormande4ef862010-01-17 17:16:12 +000081static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070082{
Christoph Lametere18b8902006-12-06 20:33:20 -080083 struct kmem_cache *slab;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080084 va_list args;
85
86 va_start(args, fmt);
Gerrit Renker8ed030d2010-02-01 02:12:19 +000087 vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080088 va_end(args);
89
Neil Hormande4ef862010-01-17 17:16:12 +000090 slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0,
Paul Mundt20c2df82007-07-20 10:11:58 +090091 SLAB_HWCACHE_ALIGN, NULL);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080092 return slab;
93}
94
Christoph Lametere18b8902006-12-06 20:33:20 -080095static void ccid_kmem_cache_destroy(struct kmem_cache *slab)
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080096{
Neil Hormande4ef862010-01-17 17:16:12 +000097 if (slab != NULL)
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080098 kmem_cache_destroy(slab);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -080099}
100
Gerrit Renkerddebc972009-01-04 21:42:53 -0800101static int ccid_activate(struct ccid_operations *ccid_ops)
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800102{
103 int err = -ENOBUFS;
104
105 ccid_ops->ccid_hc_rx_slab =
106 ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size,
Neil Hormande4ef862010-01-17 17:16:12 +0000107 ccid_ops->ccid_hc_rx_slab_name,
Gerrit Renker84a97b02007-12-13 23:33:25 -0200108 "ccid%u_hc_rx_sock",
109 ccid_ops->ccid_id);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800110 if (ccid_ops->ccid_hc_rx_slab == NULL)
111 goto out;
112
113 ccid_ops->ccid_hc_tx_slab =
114 ccid_kmem_cache_create(ccid_ops->ccid_hc_tx_obj_size,
Neil Hormande4ef862010-01-17 17:16:12 +0000115 ccid_ops->ccid_hc_tx_slab_name,
Gerrit Renker84a97b02007-12-13 23:33:25 -0200116 "ccid%u_hc_tx_sock",
117 ccid_ops->ccid_id);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800118 if (ccid_ops->ccid_hc_tx_slab == NULL)
119 goto out_free_rx_slab;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700120
Gerrit Renker1fd9d202011-07-03 09:51:14 -0600121 pr_info("DCCP: Activated CCID %d (%s)\n",
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800122 ccid_ops->ccid_id, ccid_ops->ccid_name);
Gerrit Renkerddebc972009-01-04 21:42:53 -0800123 err = 0;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800124out:
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700125 return err;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800126out_free_rx_slab:
127 ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
128 ccid_ops->ccid_hc_rx_slab = NULL;
129 goto out;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700130}
131
Gerrit Renkerddebc972009-01-04 21:42:53 -0800132static void ccid_deactivate(struct ccid_operations *ccid_ops)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700133{
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800134 ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab);
135 ccid_ops->ccid_hc_tx_slab = NULL;
136 ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab);
137 ccid_ops->ccid_hc_rx_slab = NULL;
138
Gerrit Renker1fd9d202011-07-03 09:51:14 -0600139 pr_info("DCCP: Deactivated CCID %d (%s)\n",
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800140 ccid_ops->ccid_id, ccid_ops->ccid_name);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700141}
142
Gerrit Renkere5fd56c2009-01-04 21:43:23 -0800143struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700144{
Gerrit Renkerddebc972009-01-04 21:42:53 -0800145 struct ccid_operations *ccid_ops = ccid_by_number(id);
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800146 struct ccid *ccid = NULL;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700147
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800148 if (ccid_ops == NULL)
Gerrit Renkerddebc972009-01-04 21:42:53 -0800149 goto out;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800150
151 ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab :
Gerrit Renkere5fd56c2009-01-04 21:43:23 -0800152 ccid_ops->ccid_hc_tx_slab, gfp_any());
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800153 if (ccid == NULL)
Gerrit Renkerddebc972009-01-04 21:42:53 -0800154 goto out;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800155 ccid->ccid_ops = ccid_ops;
156 if (rx) {
157 memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size);
158 if (ccid->ccid_ops->ccid_hc_rx_init != NULL &&
159 ccid->ccid_ops->ccid_hc_rx_init(ccid, sk) != 0)
160 goto out_free_ccid;
161 } else {
162 memset(ccid + 1, 0, ccid_ops->ccid_hc_tx_obj_size);
163 if (ccid->ccid_ops->ccid_hc_tx_init != NULL &&
164 ccid->ccid_ops->ccid_hc_tx_init(ccid, sk) != 0)
165 goto out_free_ccid;
166 }
167out:
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700168 return ccid;
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800169out_free_ccid:
170 kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab :
171 ccid_ops->ccid_hc_tx_slab, ccid);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700172 ccid = NULL;
173 goto out;
174}
175
Gerrit Renkere5fd56c2009-01-04 21:43:23 -0800176void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk)
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800177{
Gerrit Renkere5fd56c2009-01-04 21:43:23 -0800178 if (ccid != NULL) {
179 if (ccid->ccid_ops->ccid_hc_rx_exit != NULL)
180 ccid->ccid_ops->ccid_hc_rx_exit(sk);
181 kmem_cache_free(ccid->ccid_ops->ccid_hc_rx_slab, ccid);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700182 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700183}
184
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800185void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk)
186{
Gerrit Renkere5fd56c2009-01-04 21:43:23 -0800187 if (ccid != NULL) {
188 if (ccid->ccid_ops->ccid_hc_tx_exit != NULL)
189 ccid->ccid_ops->ccid_hc_tx_exit(sk);
190 kmem_cache_free(ccid->ccid_ops->ccid_hc_tx_slab, ccid);
191 }
Arnaldo Carvalho de Melo91f0ebf2006-03-20 19:21:44 -0800192}
193
Gerrit Renkerddebc972009-01-04 21:42:53 -0800194int __init ccid_initialize_builtins(void)
195{
Gerrit Renker129fa442009-01-04 21:45:33 -0800196 int i, err = tfrc_lib_init();
197
198 if (err)
199 return err;
Gerrit Renkerddebc972009-01-04 21:42:53 -0800200
201 for (i = 0; i < ARRAY_SIZE(ccids); i++) {
202 err = ccid_activate(ccids[i]);
203 if (err)
204 goto unwind_registrations;
205 }
206 return 0;
207
208unwind_registrations:
209 while(--i >= 0)
210 ccid_deactivate(ccids[i]);
Gerrit Renker129fa442009-01-04 21:45:33 -0800211 tfrc_lib_exit();
Gerrit Renkerddebc972009-01-04 21:42:53 -0800212 return err;
213}
214
215void ccid_cleanup_builtins(void)
216{
217 int i;
218
219 for (i = 0; i < ARRAY_SIZE(ccids); i++)
220 ccid_deactivate(ccids[i]);
Gerrit Renker129fa442009-01-04 21:45:33 -0800221 tfrc_lib_exit();
Gerrit Renkerddebc972009-01-04 21:42:53 -0800222}