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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 | * This function allocates memory - caller must see that it is freed after use. |
50 | */ |
51 | int 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 | |
62 | int 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 | |
68 | if (ccid_get_builtin_ccids(&ccid_array, &array_len)) |
69 | return -ENOBUFS; |
70 | |
71 | 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)) |
75 | err = -EFAULT; |
76 | |
77 | kfree(ccid_array); |
78 | return err; |
79 | } |
80 | |
81 | static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_fmt, const char *fmt,...) |
82 | { |
83 | struct kmem_cache *slab; |
84 | va_list args; |
85 | |
86 | va_start(args, fmt); |
87 | vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args); |
88 | va_end(args); |
89 | |
90 | slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0, |
91 | SLAB_HWCACHE_ALIGN, NULL); |
92 | return slab; |
93 | } |
94 | |
95 | static void ccid_kmem_cache_destroy(struct kmem_cache *slab) |
96 | { |
97 | if (slab != NULL) |
98 | kmem_cache_destroy(slab); |
99 | } |
100 | |
101 | static int ccid_activate(struct ccid_operations *ccid_ops) |
102 | { |
103 | int err = -ENOBUFS; |
104 | |
105 | ccid_ops->ccid_hc_rx_slab = |
106 | ccid_kmem_cache_create(ccid_ops->ccid_hc_rx_obj_size, |
107 | ccid_ops->ccid_hc_rx_slab_name, |
108 | "ccid%u_hc_rx_sock", |
109 | ccid_ops->ccid_id); |
110 | 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, |
115 | ccid_ops->ccid_hc_tx_slab_name, |
116 | "ccid%u_hc_tx_sock", |
117 | ccid_ops->ccid_id); |
118 | if (ccid_ops->ccid_hc_tx_slab == NULL) |
119 | goto out_free_rx_slab; |
120 | |
121 | pr_info("CCID: Activated CCID %d (%s)\n", |
122 | ccid_ops->ccid_id, ccid_ops->ccid_name); |
123 | err = 0; |
124 | out: |
125 | return err; |
126 | out_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; |
130 | } |
131 | |
132 | static void ccid_deactivate(struct ccid_operations *ccid_ops) |
133 | { |
134 | 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 | |
139 | pr_info("CCID: Deactivated CCID %d (%s)\n", |
140 | ccid_ops->ccid_id, ccid_ops->ccid_name); |
141 | } |
142 | |
143 | struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx) |
144 | { |
145 | struct ccid_operations *ccid_ops = ccid_by_number(id); |
146 | struct ccid *ccid = NULL; |
147 | |
148 | if (ccid_ops == NULL) |
149 | goto out; |
150 | |
151 | ccid = kmem_cache_alloc(rx ? ccid_ops->ccid_hc_rx_slab : |
152 | ccid_ops->ccid_hc_tx_slab, gfp_any()); |
153 | if (ccid == NULL) |
154 | goto out; |
155 | 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 | } |
167 | out: |
168 | return ccid; |
169 | out_free_ccid: |
170 | kmem_cache_free(rx ? ccid_ops->ccid_hc_rx_slab : |
171 | ccid_ops->ccid_hc_tx_slab, ccid); |
172 | ccid = NULL; |
173 | goto out; |
174 | } |
175 | |
176 | void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk) |
177 | { |
178 | 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); |
182 | } |
183 | } |
184 | |
185 | void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk) |
186 | { |
187 | 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 | } |
192 | } |
193 | |
194 | int __init ccid_initialize_builtins(void) |
195 | { |
196 | int i, err = tfrc_lib_init(); |
197 | |
198 | if (err) |
199 | return err; |
200 | |
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 | |
208 | unwind_registrations: |
209 | while(--i >= 0) |
210 | ccid_deactivate(ccids[i]); |
211 | tfrc_lib_exit(); |
212 | return err; |
213 | } |
214 | |
215 | void ccid_cleanup_builtins(void) |
216 | { |
217 | int i; |
218 | |
219 | for (i = 0; i < ARRAY_SIZE(ccids); i++) |
220 | ccid_deactivate(ccids[i]); |
221 | tfrc_lib_exit(); |
222 | } |
223 |
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