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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 "ccid.h" |
15 | #include "ccids/lib/tfrc.h" |
16 | |
17 | static struct ccid_operations *ccids[] = { |
18 | &ccid2_ops, |
19 | #ifdef CONFIG_IP_DCCP_CCID3 |
20 | &ccid3_ops, |
21 | #endif |
22 | }; |
23 | |
24 | static struct ccid_operations *ccid_by_number(const u8 id) |
25 | { |
26 | int i; |
27 | |
28 | for (i = 0; i < ARRAY_SIZE(ccids); i++) |
29 | if (ccids[i]->ccid_id == id) |
30 | return ccids[i]; |
31 | return NULL; |
32 | } |
33 | |
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) |
36 | { |
37 | while (array_len > 0) |
38 | if (ccid_by_number(ccid_array[--array_len]) == NULL) |
39 | return false; |
40 | return true; |
41 | } |
42 | |
43 | /** |
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. |
48 | */ |
49 | int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len) |
50 | { |
51 | *ccid_array = kmalloc(ARRAY_SIZE(ccids), gfp_any()); |
52 | if (*ccid_array == NULL) |
53 | return -ENOBUFS; |
54 | |
55 | for (*array_len = 0; *array_len < ARRAY_SIZE(ccids); *array_len += 1) |
56 | (*ccid_array)[*array_len] = ccids[*array_len]->ccid_id; |
57 | return 0; |
58 | } |
59 | |
60 | int ccid_getsockopt_builtin_ccids(struct sock *sk, int len, |
61 | char __user *optval, int __user *optlen) |
62 | { |
63 | u8 *ccid_array, array_len; |
64 | int err = 0; |
65 | |
66 | if (len < ARRAY_SIZE(ccids)) |
67 | return -EINVAL; |
68 | |
69 | if (ccid_get_builtin_ccids(&ccid_array, &array_len)) |
70 | return -ENOBUFS; |
71 | |
72 | if (put_user(array_len, optlen) || |
73 | copy_to_user(optval, ccid_array, array_len)) |
74 | err = -EFAULT; |
75 | |
76 | kfree(ccid_array); |
77 | return err; |
78 | } |
79 | |
80 | static struct kmem_cache *ccid_kmem_cache_create(int obj_size, const char *fmt,...) |
81 | { |
82 | struct kmem_cache *slab; |
83 | char slab_name_fmt[32], *slab_name; |
84 | va_list args; |
85 | |
86 | va_start(args, fmt); |
87 | vsnprintf(slab_name_fmt, sizeof(slab_name_fmt), fmt, args); |
88 | va_end(args); |
89 | |
90 | slab_name = kstrdup(slab_name_fmt, GFP_KERNEL); |
91 | if (slab_name == NULL) |
92 | return NULL; |
93 | slab = kmem_cache_create(slab_name, sizeof(struct ccid) + obj_size, 0, |
94 | SLAB_HWCACHE_ALIGN, NULL); |
95 | if (slab == NULL) |
96 | kfree(slab_name); |
97 | return slab; |
98 | } |
99 | |
100 | static void ccid_kmem_cache_destroy(struct kmem_cache *slab) |
101 | { |
102 | if (slab != NULL) { |
103 | const char *name = kmem_cache_name(slab); |
104 | |
105 | kmem_cache_destroy(slab); |
106 | kfree(name); |
107 | } |
108 | } |
109 | |
110 | static int ccid_activate(struct ccid_operations *ccid_ops) |
111 | { |
112 | int err = -ENOBUFS; |
113 | |
114 | ccid_ops->ccid_hc_rx_slab = |
115 | ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size, |
116 | "ccid%u_hc_rx_sock", |
117 | ccid_ops->ccid_id); |
118 | if (ccid_ops->ccid_hc_rx_slab == NULL) |
119 | goto out; |
120 | |
121 | ccid_ops->ccid_hc_tx_slab = |
122 | ccid_kmem_cache_create(ccid_ops->ccid_hc_tx_obj_size, |
123 | "ccid%u_hc_tx_sock", |
124 | ccid_ops->ccid_id); |
125 | if (ccid_ops->ccid_hc_tx_slab == NULL) |
126 | goto out_free_rx_slab; |
127 | |
128 | pr_info("CCID: Activated CCID %d (%s)\n", |
129 | ccid_ops->ccid_id, ccid_ops->ccid_name); |
130 | err = 0; |
131 | out: |
132 | return err; |
133 | out_free_rx_slab: |
134 | ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab); |
135 | ccid_ops->ccid_hc_rx_slab = NULL; |
136 | goto out; |
137 | } |
138 | |
139 | static void ccid_deactivate(struct ccid_operations *ccid_ops) |
140 | { |
141 | ccid_kmem_cache_destroy(ccid_ops->ccid_hc_tx_slab); |
142 | ccid_ops->ccid_hc_tx_slab = NULL; |
143 | ccid_kmem_cache_destroy(ccid_ops->ccid_hc_rx_slab); |
144 | ccid_ops->ccid_hc_rx_slab = NULL; |
145 | |
146 | pr_info("CCID: Deactivated CCID %d (%s)\n", |
147 | ccid_ops->ccid_id, ccid_ops->ccid_name); |
148 | } |
149 | |
150 | struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx) |
151 | { |
152 | struct ccid_operations *ccid_ops = ccid_by_number(id); |
153 | struct ccid *ccid = NULL; |
154 | |
155 | if (ccid_ops == NULL) |
156 | goto out; |
157 | |
158 | ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab : |
159 | ccid_ops->ccid_hc_tx_slab, gfp_any()); |
160 | if (ccid == NULL) |
161 | goto out; |
162 | ccid->ccid_ops = ccid_ops; |
163 | if (rx) { |
164 | memset(ccid + 1, 0, ccid_ops->ccid_hc_rx_obj_size); |
165 | if (ccid->ccid_ops->ccid_hc_rx_init != NULL && |
166 | ccid->ccid_ops->ccid_hc_rx_init(ccid, sk) != 0) |
167 | goto out_free_ccid; |
168 | } else { |
169 | memset(ccid + 1, 0, ccid_ops->ccid_hc_tx_obj_size); |
170 | if (ccid->ccid_ops->ccid_hc_tx_init != NULL && |
171 | ccid->ccid_ops->ccid_hc_tx_init(ccid, sk) != 0) |
172 | goto out_free_ccid; |
173 | } |
174 | out: |
175 | return ccid; |
176 | out_free_ccid: |
177 | kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab : |
178 | ccid_ops->ccid_hc_tx_slab, ccid); |
179 | ccid = NULL; |
180 | goto out; |
181 | } |
182 | |
183 | void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk) |
184 | { |
185 | if (ccid != NULL) { |
186 | if (ccid->ccid_ops->ccid_hc_rx_exit != NULL) |
187 | ccid->ccid_ops->ccid_hc_rx_exit(sk); |
188 | kmem_cache_free(ccid->ccid_ops->ccid_hc_rx_slab, ccid); |
189 | } |
190 | } |
191 | |
192 | void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk) |
193 | { |
194 | if (ccid != NULL) { |
195 | if (ccid->ccid_ops->ccid_hc_tx_exit != NULL) |
196 | ccid->ccid_ops->ccid_hc_tx_exit(sk); |
197 | kmem_cache_free(ccid->ccid_ops->ccid_hc_tx_slab, ccid); |
198 | } |
199 | } |
200 | |
201 | int __init ccid_initialize_builtins(void) |
202 | { |
203 | int i, err = tfrc_lib_init(); |
204 | |
205 | if (err) |
206 | return err; |
207 | |
208 | for (i = 0; i < ARRAY_SIZE(ccids); i++) { |
209 | err = ccid_activate(ccids[i]); |
210 | if (err) |
211 | goto unwind_registrations; |
212 | } |
213 | return 0; |
214 | |
215 | unwind_registrations: |
216 | while(--i >= 0) |
217 | ccid_deactivate(ccids[i]); |
218 | tfrc_lib_exit(); |
219 | return err; |
220 | } |
221 | |
222 | void ccid_cleanup_builtins(void) |
223 | { |
224 | int i; |
225 | |
226 | for (i = 0; i < ARRAY_SIZE(ccids); i++) |
227 | ccid_deactivate(ccids[i]); |
228 | tfrc_lib_exit(); |
229 | } |
230 |
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