1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * IP Payload Compression Protocol (IPComp) - 3 * IP Payload Compression Protocol (IPComp) - RFC3173.
4 * 4 *
5 * Copyright (c) 2003 James Morris <jmorris@in 5 * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
6 * Copyright (c) 2003-2008 Herbert Xu <herbert 6 * Copyright (c) 2003-2008 Herbert Xu <herbert@gondor.apana.org.au>
7 * 7 *
8 * Todo: 8 * Todo:
9 * - Tunable compression parameters. 9 * - Tunable compression parameters.
10 * - Compression stats. 10 * - Compression stats.
11 * - Adaptive compression. 11 * - Adaptive compression.
12 */ 12 */
13 13
14 #include <linux/crypto.h> 14 #include <linux/crypto.h>
15 #include <linux/err.h> 15 #include <linux/err.h>
16 #include <linux/list.h> 16 #include <linux/list.h>
17 #include <linux/module.h> 17 #include <linux/module.h>
18 #include <linux/mutex.h> 18 #include <linux/mutex.h>
19 #include <linux/percpu.h> 19 #include <linux/percpu.h>
20 #include <linux/slab.h> 20 #include <linux/slab.h>
21 #include <linux/smp.h> 21 #include <linux/smp.h>
22 #include <linux/vmalloc.h> 22 #include <linux/vmalloc.h>
23 #include <net/ip.h> 23 #include <net/ip.h>
24 #include <net/ipcomp.h> 24 #include <net/ipcomp.h>
25 #include <net/xfrm.h> 25 #include <net/xfrm.h>
26 26
27 struct ipcomp_tfms { 27 struct ipcomp_tfms {
28 struct list_head list; 28 struct list_head list;
29 struct crypto_comp * __percpu *tfms; 29 struct crypto_comp * __percpu *tfms;
30 int users; 30 int users;
31 }; 31 };
32 32
33 static DEFINE_MUTEX(ipcomp_resource_mutex); 33 static DEFINE_MUTEX(ipcomp_resource_mutex);
34 static void * __percpu *ipcomp_scratches; 34 static void * __percpu *ipcomp_scratches;
35 static int ipcomp_scratch_users; 35 static int ipcomp_scratch_users;
36 static LIST_HEAD(ipcomp_tfms_list); 36 static LIST_HEAD(ipcomp_tfms_list);
37 37
38 static int ipcomp_decompress(struct xfrm_state 38 static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
39 { 39 {
40 struct ipcomp_data *ipcd = x->data; 40 struct ipcomp_data *ipcd = x->data;
41 const int plen = skb->len; 41 const int plen = skb->len;
42 int dlen = IPCOMP_SCRATCH_SIZE; 42 int dlen = IPCOMP_SCRATCH_SIZE;
43 const u8 *start = skb->data; 43 const u8 *start = skb->data;
44 u8 *scratch = *this_cpu_ptr(ipcomp_scr !! 44 const int cpu = get_cpu();
45 struct crypto_comp *tfm = *this_cpu_pt !! 45 u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
>> 46 struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
46 int err = crypto_comp_decompress(tfm, 47 int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
47 int len; 48 int len;
48 49
49 if (err) 50 if (err)
50 return err; !! 51 goto out;
51 52
52 if (dlen < (plen + sizeof(struct ip_co !! 53 if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
53 return -EINVAL; !! 54 err = -EINVAL;
>> 55 goto out;
>> 56 }
54 57
55 len = dlen - plen; 58 len = dlen - plen;
56 if (len > skb_tailroom(skb)) 59 if (len > skb_tailroom(skb))
57 len = skb_tailroom(skb); 60 len = skb_tailroom(skb);
58 61
59 __skb_put(skb, len); 62 __skb_put(skb, len);
60 63
61 len += plen; 64 len += plen;
62 skb_copy_to_linear_data(skb, scratch, 65 skb_copy_to_linear_data(skb, scratch, len);
63 66
64 while ((scratch += len, dlen -= len) > 67 while ((scratch += len, dlen -= len) > 0) {
65 skb_frag_t *frag; 68 skb_frag_t *frag;
66 struct page *page; 69 struct page *page;
67 70
>> 71 err = -EMSGSIZE;
68 if (WARN_ON(skb_shinfo(skb)->n 72 if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS))
69 return -EMSGSIZE; !! 73 goto out;
70 74
71 frag = skb_shinfo(skb)->frags 75 frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;
72 page = alloc_page(GFP_ATOMIC); 76 page = alloc_page(GFP_ATOMIC);
73 77
>> 78 err = -ENOMEM;
74 if (!page) 79 if (!page)
75 return -ENOMEM; !! 80 goto out;
>> 81
>> 82 __skb_frag_set_page(frag, page);
76 83
77 len = PAGE_SIZE; 84 len = PAGE_SIZE;
78 if (dlen < len) 85 if (dlen < len)
79 len = dlen; 86 len = dlen;
80 87
81 skb_frag_fill_page_desc(frag, !! 88 skb_frag_off_set(frag, 0);
>> 89 skb_frag_size_set(frag, len);
82 memcpy(skb_frag_address(frag), 90 memcpy(skb_frag_address(frag), scratch, len);
83 91
84 skb->truesize += len; 92 skb->truesize += len;
85 skb->data_len += len; 93 skb->data_len += len;
86 skb->len += len; 94 skb->len += len;
87 95
88 skb_shinfo(skb)->nr_frags++; 96 skb_shinfo(skb)->nr_frags++;
89 } 97 }
90 98
91 return 0; !! 99 err = 0;
>> 100
>> 101 out:
>> 102 put_cpu();
>> 103 return err;
92 } 104 }
93 105
94 int ipcomp_input(struct xfrm_state *x, struct 106 int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
95 { 107 {
96 int nexthdr; 108 int nexthdr;
97 int err = -ENOMEM; 109 int err = -ENOMEM;
98 struct ip_comp_hdr *ipch; 110 struct ip_comp_hdr *ipch;
99 111
100 if (skb_linearize_cow(skb)) 112 if (skb_linearize_cow(skb))
101 goto out; 113 goto out;
102 114
103 skb->ip_summed = CHECKSUM_NONE; 115 skb->ip_summed = CHECKSUM_NONE;
104 116
105 /* Remove ipcomp header and decompress 117 /* Remove ipcomp header and decompress original payload */
106 ipch = (void *)skb->data; 118 ipch = (void *)skb->data;
107 nexthdr = ipch->nexthdr; 119 nexthdr = ipch->nexthdr;
108 120
109 skb->transport_header = skb->network_h 121 skb->transport_header = skb->network_header + sizeof(*ipch);
110 __skb_pull(skb, sizeof(*ipch)); 122 __skb_pull(skb, sizeof(*ipch));
111 err = ipcomp_decompress(x, skb); 123 err = ipcomp_decompress(x, skb);
112 if (err) 124 if (err)
113 goto out; 125 goto out;
114 126
115 err = nexthdr; 127 err = nexthdr;
116 128
117 out: 129 out:
118 return err; 130 return err;
119 } 131 }
120 EXPORT_SYMBOL_GPL(ipcomp_input); 132 EXPORT_SYMBOL_GPL(ipcomp_input);
121 133
122 static int ipcomp_compress(struct xfrm_state * 134 static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
123 { 135 {
124 struct ipcomp_data *ipcd = x->data; 136 struct ipcomp_data *ipcd = x->data;
125 const int plen = skb->len; 137 const int plen = skb->len;
126 int dlen = IPCOMP_SCRATCH_SIZE; 138 int dlen = IPCOMP_SCRATCH_SIZE;
127 u8 *start = skb->data; 139 u8 *start = skb->data;
128 struct crypto_comp *tfm; 140 struct crypto_comp *tfm;
129 u8 *scratch; 141 u8 *scratch;
130 int err; 142 int err;
131 143
132 local_bh_disable(); 144 local_bh_disable();
133 scratch = *this_cpu_ptr(ipcomp_scratch 145 scratch = *this_cpu_ptr(ipcomp_scratches);
134 tfm = *this_cpu_ptr(ipcd->tfms); 146 tfm = *this_cpu_ptr(ipcd->tfms);
135 err = crypto_comp_compress(tfm, start, 147 err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
136 if (err) 148 if (err)
137 goto out; 149 goto out;
138 150
139 if ((dlen + sizeof(struct ip_comp_hdr) 151 if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
140 err = -EMSGSIZE; 152 err = -EMSGSIZE;
141 goto out; 153 goto out;
142 } 154 }
143 155
144 memcpy(start + sizeof(struct ip_comp_h 156 memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
145 local_bh_enable(); 157 local_bh_enable();
146 158
147 pskb_trim(skb, dlen + sizeof(struct ip 159 pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
148 return 0; 160 return 0;
149 161
150 out: 162 out:
151 local_bh_enable(); 163 local_bh_enable();
152 return err; 164 return err;
153 } 165 }
154 166
155 int ipcomp_output(struct xfrm_state *x, struct 167 int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
156 { 168 {
157 int err; 169 int err;
158 struct ip_comp_hdr *ipch; 170 struct ip_comp_hdr *ipch;
159 struct ipcomp_data *ipcd = x->data; 171 struct ipcomp_data *ipcd = x->data;
160 172
161 if (skb->len < ipcd->threshold) { 173 if (skb->len < ipcd->threshold) {
162 /* Don't bother compressing */ 174 /* Don't bother compressing */
163 goto out_ok; 175 goto out_ok;
164 } 176 }
165 177
166 if (skb_linearize_cow(skb)) 178 if (skb_linearize_cow(skb))
167 goto out_ok; 179 goto out_ok;
168 180
169 err = ipcomp_compress(x, skb); 181 err = ipcomp_compress(x, skb);
170 182
171 if (err) { 183 if (err) {
172 goto out_ok; 184 goto out_ok;
173 } 185 }
174 186
175 /* Install ipcomp header, convert into 187 /* Install ipcomp header, convert into ipcomp datagram. */
176 ipch = ip_comp_hdr(skb); 188 ipch = ip_comp_hdr(skb);
177 ipch->nexthdr = *skb_mac_header(skb); 189 ipch->nexthdr = *skb_mac_header(skb);
178 ipch->flags = 0; 190 ipch->flags = 0;
179 ipch->cpi = htons((u16 )ntohl(x->id.sp 191 ipch->cpi = htons((u16 )ntohl(x->id.spi));
180 *skb_mac_header(skb) = IPPROTO_COMP; 192 *skb_mac_header(skb) = IPPROTO_COMP;
181 out_ok: 193 out_ok:
182 skb_push(skb, -skb_network_offset(skb) 194 skb_push(skb, -skb_network_offset(skb));
183 return 0; 195 return 0;
184 } 196 }
185 EXPORT_SYMBOL_GPL(ipcomp_output); 197 EXPORT_SYMBOL_GPL(ipcomp_output);
186 198
187 static void ipcomp_free_scratches(void) 199 static void ipcomp_free_scratches(void)
188 { 200 {
189 int i; 201 int i;
190 void * __percpu *scratches; 202 void * __percpu *scratches;
191 203
192 if (--ipcomp_scratch_users) 204 if (--ipcomp_scratch_users)
193 return; 205 return;
194 206
195 scratches = ipcomp_scratches; 207 scratches = ipcomp_scratches;
196 if (!scratches) 208 if (!scratches)
197 return; 209 return;
198 210
199 for_each_possible_cpu(i) 211 for_each_possible_cpu(i)
200 vfree(*per_cpu_ptr(scratches, 212 vfree(*per_cpu_ptr(scratches, i));
201 213
202 free_percpu(scratches); 214 free_percpu(scratches);
203 ipcomp_scratches = NULL; 215 ipcomp_scratches = NULL;
204 } 216 }
205 217
206 static void * __percpu *ipcomp_alloc_scratches 218 static void * __percpu *ipcomp_alloc_scratches(void)
207 { 219 {
208 void * __percpu *scratches; 220 void * __percpu *scratches;
209 int i; 221 int i;
210 222
211 if (ipcomp_scratch_users++) 223 if (ipcomp_scratch_users++)
212 return ipcomp_scratches; 224 return ipcomp_scratches;
213 225
214 scratches = alloc_percpu(void *); 226 scratches = alloc_percpu(void *);
215 if (!scratches) 227 if (!scratches)
216 return NULL; 228 return NULL;
217 229
218 ipcomp_scratches = scratches; 230 ipcomp_scratches = scratches;
219 231
220 for_each_possible_cpu(i) { 232 for_each_possible_cpu(i) {
221 void *scratch; 233 void *scratch;
222 234
223 scratch = vmalloc_node(IPCOMP_ 235 scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i));
224 if (!scratch) 236 if (!scratch)
225 return NULL; 237 return NULL;
226 *per_cpu_ptr(scratches, i) = s 238 *per_cpu_ptr(scratches, i) = scratch;
227 } 239 }
228 240
229 return scratches; 241 return scratches;
230 } 242 }
231 243
232 static void ipcomp_free_tfms(struct crypto_com 244 static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms)
233 { 245 {
234 struct ipcomp_tfms *pos; 246 struct ipcomp_tfms *pos;
235 int cpu; 247 int cpu;
236 248
237 list_for_each_entry(pos, &ipcomp_tfms_ 249 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
238 if (pos->tfms == tfms) 250 if (pos->tfms == tfms)
239 break; 251 break;
240 } 252 }
241 253
242 WARN_ON(list_entry_is_head(pos, &ipcom !! 254 WARN_ON(!pos);
243 255
244 if (--pos->users) 256 if (--pos->users)
245 return; 257 return;
246 258
247 list_del(&pos->list); 259 list_del(&pos->list);
248 kfree(pos); 260 kfree(pos);
249 261
250 if (!tfms) 262 if (!tfms)
251 return; 263 return;
252 264
253 for_each_possible_cpu(cpu) { 265 for_each_possible_cpu(cpu) {
254 struct crypto_comp *tfm = *per 266 struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
255 crypto_free_comp(tfm); 267 crypto_free_comp(tfm);
256 } 268 }
257 free_percpu(tfms); 269 free_percpu(tfms);
258 } 270 }
259 271
260 static struct crypto_comp * __percpu *ipcomp_a 272 static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name)
261 { 273 {
262 struct ipcomp_tfms *pos; 274 struct ipcomp_tfms *pos;
263 struct crypto_comp * __percpu *tfms; 275 struct crypto_comp * __percpu *tfms;
264 int cpu; 276 int cpu;
265 277
266 278
267 list_for_each_entry(pos, &ipcomp_tfms_ 279 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
268 struct crypto_comp *tfm; 280 struct crypto_comp *tfm;
269 281
270 /* This can be any valid CPU I 282 /* This can be any valid CPU ID so we don't need locking. */
271 tfm = this_cpu_read(*pos->tfms 283 tfm = this_cpu_read(*pos->tfms);
272 284
273 if (!strcmp(crypto_comp_name(t 285 if (!strcmp(crypto_comp_name(tfm), alg_name)) {
274 pos->users++; 286 pos->users++;
275 return pos->tfms; 287 return pos->tfms;
276 } 288 }
277 } 289 }
278 290
279 pos = kmalloc(sizeof(*pos), GFP_KERNEL 291 pos = kmalloc(sizeof(*pos), GFP_KERNEL);
280 if (!pos) 292 if (!pos)
281 return NULL; 293 return NULL;
282 294
283 pos->users = 1; 295 pos->users = 1;
284 INIT_LIST_HEAD(&pos->list); 296 INIT_LIST_HEAD(&pos->list);
285 list_add(&pos->list, &ipcomp_tfms_list 297 list_add(&pos->list, &ipcomp_tfms_list);
286 298
287 pos->tfms = tfms = alloc_percpu(struct 299 pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
288 if (!tfms) 300 if (!tfms)
289 goto error; 301 goto error;
290 302
291 for_each_possible_cpu(cpu) { 303 for_each_possible_cpu(cpu) {
292 struct crypto_comp *tfm = cryp 304 struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
293 305 CRYPTO_ALG_ASYNC);
294 if (IS_ERR(tfm)) 306 if (IS_ERR(tfm))
295 goto error; 307 goto error;
296 *per_cpu_ptr(tfms, cpu) = tfm; 308 *per_cpu_ptr(tfms, cpu) = tfm;
297 } 309 }
298 310
299 return tfms; 311 return tfms;
300 312
301 error: 313 error:
302 ipcomp_free_tfms(tfms); 314 ipcomp_free_tfms(tfms);
303 return NULL; 315 return NULL;
304 } 316 }
305 317
306 static void ipcomp_free_data(struct ipcomp_dat 318 static void ipcomp_free_data(struct ipcomp_data *ipcd)
307 { 319 {
308 if (ipcd->tfms) 320 if (ipcd->tfms)
309 ipcomp_free_tfms(ipcd->tfms); 321 ipcomp_free_tfms(ipcd->tfms);
310 ipcomp_free_scratches(); 322 ipcomp_free_scratches();
311 } 323 }
312 324
313 void ipcomp_destroy(struct xfrm_state *x) 325 void ipcomp_destroy(struct xfrm_state *x)
314 { 326 {
315 struct ipcomp_data *ipcd = x->data; 327 struct ipcomp_data *ipcd = x->data;
316 if (!ipcd) 328 if (!ipcd)
317 return; 329 return;
318 xfrm_state_delete_tunnel(x); 330 xfrm_state_delete_tunnel(x);
319 mutex_lock(&ipcomp_resource_mutex); 331 mutex_lock(&ipcomp_resource_mutex);
320 ipcomp_free_data(ipcd); 332 ipcomp_free_data(ipcd);
321 mutex_unlock(&ipcomp_resource_mutex); 333 mutex_unlock(&ipcomp_resource_mutex);
322 kfree(ipcd); 334 kfree(ipcd);
323 } 335 }
324 EXPORT_SYMBOL_GPL(ipcomp_destroy); 336 EXPORT_SYMBOL_GPL(ipcomp_destroy);
325 337
326 int ipcomp_init_state(struct xfrm_state *x, st !! 338 int ipcomp_init_state(struct xfrm_state *x)
327 { 339 {
328 int err; 340 int err;
329 struct ipcomp_data *ipcd; 341 struct ipcomp_data *ipcd;
330 struct xfrm_algo_desc *calg_desc; 342 struct xfrm_algo_desc *calg_desc;
331 343
332 err = -EINVAL; 344 err = -EINVAL;
333 if (!x->calg) { !! 345 if (!x->calg)
334 NL_SET_ERR_MSG(extack, "Missin <<
335 goto out; 346 goto out;
336 } <<
337 347
338 if (x->encap) { !! 348 if (x->encap)
339 NL_SET_ERR_MSG(extack, "IPComp <<
340 goto out; 349 goto out;
341 } <<
342 350
343 err = -ENOMEM; 351 err = -ENOMEM;
344 ipcd = kzalloc(sizeof(*ipcd), GFP_KERN 352 ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
345 if (!ipcd) 353 if (!ipcd)
346 goto out; 354 goto out;
347 355
348 mutex_lock(&ipcomp_resource_mutex); 356 mutex_lock(&ipcomp_resource_mutex);
349 if (!ipcomp_alloc_scratches()) 357 if (!ipcomp_alloc_scratches())
350 goto error; 358 goto error;
351 359
352 ipcd->tfms = ipcomp_alloc_tfms(x->calg 360 ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
353 if (!ipcd->tfms) 361 if (!ipcd->tfms)
354 goto error; 362 goto error;
355 mutex_unlock(&ipcomp_resource_mutex); 363 mutex_unlock(&ipcomp_resource_mutex);
356 364
357 calg_desc = xfrm_calg_get_byname(x->ca 365 calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
358 BUG_ON(!calg_desc); 366 BUG_ON(!calg_desc);
359 ipcd->threshold = calg_desc->uinfo.com 367 ipcd->threshold = calg_desc->uinfo.comp.threshold;
360 x->data = ipcd; 368 x->data = ipcd;
361 err = 0; 369 err = 0;
362 out: 370 out:
363 return err; 371 return err;
364 372
365 error: 373 error:
366 ipcomp_free_data(ipcd); 374 ipcomp_free_data(ipcd);
367 mutex_unlock(&ipcomp_resource_mutex); 375 mutex_unlock(&ipcomp_resource_mutex);
368 kfree(ipcd); 376 kfree(ipcd);
369 goto out; 377 goto out;
370 } 378 }
371 EXPORT_SYMBOL_GPL(ipcomp_init_state); 379 EXPORT_SYMBOL_GPL(ipcomp_init_state);
372 380
373 MODULE_LICENSE("GPL"); 381 MODULE_LICENSE("GPL");
374 MODULE_DESCRIPTION("IP Payload Compression Pro 382 MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173");
375 MODULE_AUTHOR("James Morris <jmorris@intercode 383 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
376 384
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