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authorHerbert Xu <herbert@gondor.apana.org.au>2008-07-25 05:54:40 -0400
committerDavid S. Miller <davem@davemloft.net>2008-07-25 05:54:40 -0400
commit6fccab671f2f0a24b799f29a4ec878f62d34656c (patch)
treee90a1ac0770f8fe59bd7c8768663052a7756b950 /net
parentcffe1c5d7a5a1e54f7c2c6d0510f651a965bccc3 (diff)
ipsec: ipcomp - Merge IPComp implementations
This patch merges the IPv4/IPv6 IPComp implementations since most of the code is identical. As a result future enhancements will no longer need to be duplicated. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/Kconfig4
-rw-r--r--net/ipv4/ipcomp.c315
-rw-r--r--net/ipv6/Kconfig4
-rw-r--r--net/ipv6/ipcomp6.c298
-rw-r--r--net/xfrm/Kconfig6
-rw-r--r--net/xfrm/Makefile1
-rw-r--r--net/xfrm/xfrm_ipcomp.c349
7 files changed, 371 insertions, 606 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 4670683b4688..591ea23639ca 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -356,10 +356,8 @@ config INET_ESP
356 356
357config INET_IPCOMP 357config INET_IPCOMP
358 tristate "IP: IPComp transformation" 358 tristate "IP: IPComp transformation"
359 select XFRM
360 select INET_XFRM_TUNNEL 359 select INET_XFRM_TUNNEL
361 select CRYPTO 360 select XFRM_IPCOMP
362 select CRYPTO_DEFLATE
363 ---help--- 361 ---help---
364 Support for IP Payload Compression Protocol (IPComp) (RFC3173), 362 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
365 typically needed for IPsec. 363 typically needed for IPsec.
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index a75807b971b3..a42b64d040c4 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -14,153 +14,14 @@
14 * - Adaptive compression. 14 * - Adaptive compression.
15 */ 15 */
16#include <linux/module.h> 16#include <linux/module.h>
17#include <linux/crypto.h>
18#include <linux/err.h> 17#include <linux/err.h>
19#include <linux/pfkeyv2.h>
20#include <linux/percpu.h>
21#include <linux/smp.h>
22#include <linux/list.h>
23#include <linux/vmalloc.h>
24#include <linux/rtnetlink.h> 18#include <linux/rtnetlink.h>
25#include <linux/mutex.h>
26#include <net/ip.h> 19#include <net/ip.h>
27#include <net/xfrm.h> 20#include <net/xfrm.h>
28#include <net/icmp.h> 21#include <net/icmp.h>
29#include <net/ipcomp.h> 22#include <net/ipcomp.h>
30#include <net/protocol.h> 23#include <net/protocol.h>
31 24#include <net/sock.h>
32struct ipcomp_tfms {
33 struct list_head list;
34 struct crypto_comp **tfms;
35 int users;
36};
37
38static DEFINE_MUTEX(ipcomp_resource_mutex);
39static void **ipcomp_scratches;
40static int ipcomp_scratch_users;
41static LIST_HEAD(ipcomp_tfms_list);
42
43static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
44{
45 struct ipcomp_data *ipcd = x->data;
46 const int plen = skb->len;
47 int dlen = IPCOMP_SCRATCH_SIZE;
48 const u8 *start = skb->data;
49 const int cpu = get_cpu();
50 u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
51 struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
52 int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
53
54 if (err)
55 goto out;
56
57 if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
58 err = -EINVAL;
59 goto out;
60 }
61
62 err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
63 if (err)
64 goto out;
65
66 skb->truesize += dlen - plen;
67 __skb_put(skb, dlen - plen);
68 skb_copy_to_linear_data(skb, scratch, dlen);
69out:
70 put_cpu();
71 return err;
72}
73
74static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
75{
76 int nexthdr;
77 int err = -ENOMEM;
78 struct ip_comp_hdr *ipch;
79
80 if (skb_linearize_cow(skb))
81 goto out;
82
83 skb->ip_summed = CHECKSUM_NONE;
84
85 /* Remove ipcomp header and decompress original payload */
86 ipch = (void *)skb->data;
87 nexthdr = ipch->nexthdr;
88
89 skb->transport_header = skb->network_header + sizeof(*ipch);
90 __skb_pull(skb, sizeof(*ipch));
91 err = ipcomp_decompress(x, skb);
92 if (err)
93 goto out;
94
95 err = nexthdr;
96
97out:
98 return err;
99}
100
101static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
102{
103 struct ipcomp_data *ipcd = x->data;
104 const int plen = skb->len;
105 int dlen = IPCOMP_SCRATCH_SIZE;
106 u8 *start = skb->data;
107 const int cpu = get_cpu();
108 u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
109 struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
110 int err;
111
112 local_bh_disable();
113 err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
114 local_bh_enable();
115 if (err)
116 goto out;
117
118 if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
119 err = -EMSGSIZE;
120 goto out;
121 }
122
123 memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
124 put_cpu();
125
126 pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
127 return 0;
128
129out:
130 put_cpu();
131 return err;
132}
133
134static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
135{
136 int err;
137 struct ip_comp_hdr *ipch;
138 struct ipcomp_data *ipcd = x->data;
139
140 if (skb->len < ipcd->threshold) {
141 /* Don't bother compressing */
142 goto out_ok;
143 }
144
145 if (skb_linearize_cow(skb))
146 goto out_ok;
147
148 err = ipcomp_compress(x, skb);
149
150 if (err) {
151 goto out_ok;
152 }
153
154 /* Install ipcomp header, convert into ipcomp datagram. */
155 ipch = ip_comp_hdr(skb);
156 ipch->nexthdr = *skb_mac_header(skb);
157 ipch->flags = 0;
158 ipch->cpi = htons((u16 )ntohl(x->id.spi));
159 *skb_mac_header(skb) = IPPROTO_COMP;
160out_ok:
161 skb_push(skb, -skb_network_offset(skb));
162 return 0;
163}
164 25
165static void ipcomp4_err(struct sk_buff *skb, u32 info) 26static void ipcomp4_err(struct sk_buff *skb, u32 info)
166{ 27{
@@ -241,156 +102,12 @@ out:
241 return err; 102 return err;
242} 103}
243 104
244static void ipcomp_free_scratches(void) 105static int ipcomp4_init_state(struct xfrm_state *x)
245{
246 int i;
247 void **scratches;
248
249 if (--ipcomp_scratch_users)
250 return;
251
252 scratches = ipcomp_scratches;
253 if (!scratches)
254 return;
255
256 for_each_possible_cpu(i)
257 vfree(*per_cpu_ptr(scratches, i));
258
259 free_percpu(scratches);
260}
261
262static void **ipcomp_alloc_scratches(void)
263{
264 int i;
265 void **scratches;
266
267 if (ipcomp_scratch_users++)
268 return ipcomp_scratches;
269
270 scratches = alloc_percpu(void *);
271 if (!scratches)
272 return NULL;
273
274 ipcomp_scratches = scratches;
275
276 for_each_possible_cpu(i) {
277 void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
278 if (!scratch)
279 return NULL;
280 *per_cpu_ptr(scratches, i) = scratch;
281 }
282
283 return scratches;
284}
285
286static void ipcomp_free_tfms(struct crypto_comp **tfms)
287{
288 struct ipcomp_tfms *pos;
289 int cpu;
290
291 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
292 if (pos->tfms == tfms)
293 break;
294 }
295
296 BUG_TRAP(pos);
297
298 if (--pos->users)
299 return;
300
301 list_del(&pos->list);
302 kfree(pos);
303
304 if (!tfms)
305 return;
306
307 for_each_possible_cpu(cpu) {
308 struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
309 crypto_free_comp(tfm);
310 }
311 free_percpu(tfms);
312}
313
314static struct crypto_comp **ipcomp_alloc_tfms(const char *alg_name)
315{
316 struct ipcomp_tfms *pos;
317 struct crypto_comp **tfms;
318 int cpu;
319
320 /* This can be any valid CPU ID so we don't need locking. */
321 cpu = raw_smp_processor_id();
322
323 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
324 struct crypto_comp *tfm;
325
326 tfms = pos->tfms;
327 tfm = *per_cpu_ptr(tfms, cpu);
328
329 if (!strcmp(crypto_comp_name(tfm), alg_name)) {
330 pos->users++;
331 return tfms;
332 }
333 }
334
335 pos = kmalloc(sizeof(*pos), GFP_KERNEL);
336 if (!pos)
337 return NULL;
338
339 pos->users = 1;
340 INIT_LIST_HEAD(&pos->list);
341 list_add(&pos->list, &ipcomp_tfms_list);
342
343 pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
344 if (!tfms)
345 goto error;
346
347 for_each_possible_cpu(cpu) {
348 struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
349 CRYPTO_ALG_ASYNC);
350 if (IS_ERR(tfm))
351 goto error;
352 *per_cpu_ptr(tfms, cpu) = tfm;
353 }
354
355 return tfms;
356
357error:
358 ipcomp_free_tfms(tfms);
359 return NULL;
360}
361
362static void ipcomp_free_data(struct ipcomp_data *ipcd)
363{
364 if (ipcd->tfms)
365 ipcomp_free_tfms(ipcd->tfms);
366 ipcomp_free_scratches();
367}
368
369static void ipcomp_destroy(struct xfrm_state *x)
370{
371 struct ipcomp_data *ipcd = x->data;
372 if (!ipcd)
373 return;
374 xfrm_state_delete_tunnel(x);
375 mutex_lock(&ipcomp_resource_mutex);
376 ipcomp_free_data(ipcd);
377 mutex_unlock(&ipcomp_resource_mutex);
378 kfree(ipcd);
379}
380
381static int ipcomp_init_state(struct xfrm_state *x)
382{ 106{
383 int err; 107 int err;
384 struct ipcomp_data *ipcd; 108 struct ipcomp_data *ipcd;
385 struct xfrm_algo_desc *calg_desc; 109 struct xfrm_algo_desc *calg_desc;
386 110
387 err = -EINVAL;
388 if (!x->calg)
389 goto out;
390
391 if (x->encap)
392 goto out;
393
394 x->props.header_len = 0; 111 x->props.header_len = 0;
395 switch (x->props.mode) { 112 switch (x->props.mode) {
396 case XFRM_MODE_TRANSPORT: 113 case XFRM_MODE_TRANSPORT:
@@ -402,40 +119,22 @@ static int ipcomp_init_state(struct xfrm_state *x)
402 goto out; 119 goto out;
403 } 120 }
404 121
405 err = -ENOMEM; 122 err = ipcomp_init_state(x);
406 ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL); 123 if (err)
407 if (!ipcd)
408 goto out; 124 goto out;
409 125
410 mutex_lock(&ipcomp_resource_mutex);
411 if (!ipcomp_alloc_scratches())
412 goto error;
413
414 ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
415 if (!ipcd->tfms)
416 goto error;
417 mutex_unlock(&ipcomp_resource_mutex);
418
419 if (x->props.mode == XFRM_MODE_TUNNEL) { 126 if (x->props.mode == XFRM_MODE_TUNNEL) {
420 err = ipcomp_tunnel_attach(x); 127 err = ipcomp_tunnel_attach(x);
421 if (err) 128 if (err)
422 goto error_tunnel; 129 goto error_tunnel;
423 } 130 }
424 131
425 calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
426 BUG_ON(!calg_desc);
427 ipcd->threshold = calg_desc->uinfo.comp.threshold;
428 x->data = ipcd;
429 err = 0; 132 err = 0;
430out: 133out:
431 return err; 134 return err;
432 135
433error_tunnel: 136error_tunnel:
434 mutex_lock(&ipcomp_resource_mutex); 137 ipcomp_destroy(x);
435error:
436 ipcomp_free_data(ipcd);
437 mutex_unlock(&ipcomp_resource_mutex);
438 kfree(ipcd);
439 goto out; 138 goto out;
440} 139}
441 140
@@ -443,7 +142,7 @@ static const struct xfrm_type ipcomp_type = {
443 .description = "IPCOMP4", 142 .description = "IPCOMP4",
444 .owner = THIS_MODULE, 143 .owner = THIS_MODULE,
445 .proto = IPPROTO_COMP, 144 .proto = IPPROTO_COMP,
446 .init_state = ipcomp_init_state, 145 .init_state = ipcomp4_init_state,
447 .destructor = ipcomp_destroy, 146 .destructor = ipcomp_destroy,
448 .input = ipcomp_input, 147 .input = ipcomp_input,
449 .output = ipcomp_output 148 .output = ipcomp_output
@@ -481,7 +180,7 @@ module_init(ipcomp4_init);
481module_exit(ipcomp4_fini); 180module_exit(ipcomp4_fini);
482 181
483MODULE_LICENSE("GPL"); 182MODULE_LICENSE("GPL");
484MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173"); 183MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp/IPv4) - RFC3173");
485MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>"); 184MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
486 185
487MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_COMP); 186MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_COMP);
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 42814a2ec9d7..ec992159b5f8 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -96,10 +96,8 @@ config INET6_ESP
96 96
97config INET6_IPCOMP 97config INET6_IPCOMP
98 tristate "IPv6: IPComp transformation" 98 tristate "IPv6: IPComp transformation"
99 select XFRM
100 select INET6_XFRM_TUNNEL 99 select INET6_XFRM_TUNNEL
101 select CRYPTO 100 select XFRM_IPCOMP
102 select CRYPTO_DEFLATE
103 ---help--- 101 ---help---
104 Support for IP Payload Compression Protocol (IPComp) (RFC3173), 102 Support for IP Payload Compression Protocol (IPComp) (RFC3173),
105 typically needed for IPsec. 103 typically needed for IPsec.
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index ee6de425ce6b..0cfcea42153a 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -50,125 +50,6 @@
50#include <linux/icmpv6.h> 50#include <linux/icmpv6.h>
51#include <linux/mutex.h> 51#include <linux/mutex.h>
52 52
53struct ipcomp6_tfms {
54 struct list_head list;
55 struct crypto_comp **tfms;
56 int users;
57};
58
59static DEFINE_MUTEX(ipcomp6_resource_mutex);
60static void **ipcomp6_scratches;
61static int ipcomp6_scratch_users;
62static LIST_HEAD(ipcomp6_tfms_list);
63
64static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb)
65{
66 int nexthdr;
67 int err = -ENOMEM;
68 struct ip_comp_hdr *ipch;
69 int plen, dlen;
70 struct ipcomp_data *ipcd = x->data;
71 u8 *start, *scratch;
72 struct crypto_comp *tfm;
73 int cpu;
74
75 if (skb_linearize_cow(skb))
76 goto out;
77
78 skb->ip_summed = CHECKSUM_NONE;
79
80 /* Remove ipcomp header and decompress original payload */
81 ipch = (void *)skb->data;
82 nexthdr = ipch->nexthdr;
83
84 skb->transport_header = skb->network_header + sizeof(*ipch);
85 __skb_pull(skb, sizeof(*ipch));
86
87 /* decompression */
88 plen = skb->len;
89 dlen = IPCOMP_SCRATCH_SIZE;
90 start = skb->data;
91
92 cpu = get_cpu();
93 scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
94 tfm = *per_cpu_ptr(ipcd->tfms, cpu);
95
96 err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
97 if (err)
98 goto out_put_cpu;
99
100 if (dlen < (plen + sizeof(*ipch))) {
101 err = -EINVAL;
102 goto out_put_cpu;
103 }
104
105 err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
106 if (err) {
107 goto out_put_cpu;
108 }
109
110 skb->truesize += dlen - plen;
111 __skb_put(skb, dlen - plen);
112 skb_copy_to_linear_data(skb, scratch, dlen);
113 err = nexthdr;
114
115out_put_cpu:
116 put_cpu();
117out:
118 return err;
119}
120
121static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
122{
123 int err;
124 struct ip_comp_hdr *ipch;
125 struct ipcomp_data *ipcd = x->data;
126 int plen, dlen;
127 u8 *start, *scratch;
128 struct crypto_comp *tfm;
129 int cpu;
130
131 /* check whether datagram len is larger than threshold */
132 if (skb->len < ipcd->threshold) {
133 goto out_ok;
134 }
135
136 if (skb_linearize_cow(skb))
137 goto out_ok;
138
139 /* compression */
140 plen = skb->len;
141 dlen = IPCOMP_SCRATCH_SIZE;
142 start = skb->data;
143
144 cpu = get_cpu();
145 scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
146 tfm = *per_cpu_ptr(ipcd->tfms, cpu);
147
148 local_bh_disable();
149 err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
150 local_bh_enable();
151 if (err || (dlen + sizeof(*ipch)) >= plen) {
152 put_cpu();
153 goto out_ok;
154 }
155 memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
156 put_cpu();
157 pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
158
159 /* insert ipcomp header and replace datagram */
160 ipch = ip_comp_hdr(skb);
161 ipch->nexthdr = *skb_mac_header(skb);
162 ipch->flags = 0;
163 ipch->cpi = htons((u16 )ntohl(x->id.spi));
164 *skb_mac_header(skb) = IPPROTO_COMP;
165
166out_ok:
167 skb_push(skb, -skb_network_offset(skb));
168
169 return 0;
170}
171
172static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 53static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
173 int type, int code, int offset, __be32 info) 54 int type, int code, int offset, __be32 info)
174{ 55{
@@ -251,161 +132,12 @@ out:
251 return err; 132 return err;
252} 133}
253 134
254static void ipcomp6_free_scratches(void)
255{
256 int i;
257 void **scratches;
258
259 if (--ipcomp6_scratch_users)
260 return;
261
262 scratches = ipcomp6_scratches;
263 if (!scratches)
264 return;
265
266 for_each_possible_cpu(i) {
267 void *scratch = *per_cpu_ptr(scratches, i);
268
269 vfree(scratch);
270 }
271
272 free_percpu(scratches);
273}
274
275static void **ipcomp6_alloc_scratches(void)
276{
277 int i;
278 void **scratches;
279
280 if (ipcomp6_scratch_users++)
281 return ipcomp6_scratches;
282
283 scratches = alloc_percpu(void *);
284 if (!scratches)
285 return NULL;
286
287 ipcomp6_scratches = scratches;
288
289 for_each_possible_cpu(i) {
290 void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
291 if (!scratch)
292 return NULL;
293 *per_cpu_ptr(scratches, i) = scratch;
294 }
295
296 return scratches;
297}
298
299static void ipcomp6_free_tfms(struct crypto_comp **tfms)
300{
301 struct ipcomp6_tfms *pos;
302 int cpu;
303
304 list_for_each_entry(pos, &ipcomp6_tfms_list, list) {
305 if (pos->tfms == tfms)
306 break;
307 }
308
309 BUG_TRAP(pos);
310
311 if (--pos->users)
312 return;
313
314 list_del(&pos->list);
315 kfree(pos);
316
317 if (!tfms)
318 return;
319
320 for_each_possible_cpu(cpu) {
321 struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
322 crypto_free_comp(tfm);
323 }
324 free_percpu(tfms);
325}
326
327static struct crypto_comp **ipcomp6_alloc_tfms(const char *alg_name)
328{
329 struct ipcomp6_tfms *pos;
330 struct crypto_comp **tfms;
331 int cpu;
332
333 /* This can be any valid CPU ID so we don't need locking. */
334 cpu = raw_smp_processor_id();
335
336 list_for_each_entry(pos, &ipcomp6_tfms_list, list) {
337 struct crypto_comp *tfm;
338
339 tfms = pos->tfms;
340 tfm = *per_cpu_ptr(tfms, cpu);
341
342 if (!strcmp(crypto_comp_name(tfm), alg_name)) {
343 pos->users++;
344 return tfms;
345 }
346 }
347
348 pos = kmalloc(sizeof(*pos), GFP_KERNEL);
349 if (!pos)
350 return NULL;
351
352 pos->users = 1;
353 INIT_LIST_HEAD(&pos->list);
354 list_add(&pos->list, &ipcomp6_tfms_list);
355
356 pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
357 if (!tfms)
358 goto error;
359
360 for_each_possible_cpu(cpu) {
361 struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
362 CRYPTO_ALG_ASYNC);
363 if (IS_ERR(tfm))
364 goto error;
365 *per_cpu_ptr(tfms, cpu) = tfm;
366 }
367
368 return tfms;
369
370error:
371 ipcomp6_free_tfms(tfms);
372 return NULL;
373}
374
375static void ipcomp6_free_data(struct ipcomp_data *ipcd)
376{
377 if (ipcd->tfms)
378 ipcomp6_free_tfms(ipcd->tfms);
379 ipcomp6_free_scratches();
380}
381
382static void ipcomp6_destroy(struct xfrm_state *x)
383{
384 struct ipcomp_data *ipcd = x->data;
385 if (!ipcd)
386 return;
387 xfrm_state_delete_tunnel(x);
388 mutex_lock(&ipcomp6_resource_mutex);
389 ipcomp6_free_data(ipcd);
390 mutex_unlock(&ipcomp6_resource_mutex);
391 kfree(ipcd);
392
393 xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
394}
395
396static int ipcomp6_init_state(struct xfrm_state *x) 135static int ipcomp6_init_state(struct xfrm_state *x)
397{ 136{
398 int err; 137 int err;
399 struct ipcomp_data *ipcd; 138 struct ipcomp_data *ipcd;
400 struct xfrm_algo_desc *calg_desc; 139 struct xfrm_algo_desc *calg_desc;
401 140
402 err = -EINVAL;
403 if (!x->calg)
404 goto out;
405
406 if (x->encap)
407 goto out;
408
409 x->props.header_len = 0; 141 x->props.header_len = 0;
410 switch (x->props.mode) { 142 switch (x->props.mode) {
411 case XFRM_MODE_TRANSPORT: 143 case XFRM_MODE_TRANSPORT:
@@ -417,39 +149,21 @@ static int ipcomp6_init_state(struct xfrm_state *x)
417 goto out; 149 goto out;
418 } 150 }
419 151
420 err = -ENOMEM; 152 err = ipcomp_init_state(x);
421 ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL); 153 if (err)
422 if (!ipcd)
423 goto out; 154 goto out;
424 155
425 mutex_lock(&ipcomp6_resource_mutex);
426 if (!ipcomp6_alloc_scratches())
427 goto error;
428
429 ipcd->tfms = ipcomp6_alloc_tfms(x->calg->alg_name);
430 if (!ipcd->tfms)
431 goto error;
432 mutex_unlock(&ipcomp6_resource_mutex);
433
434 if (x->props.mode == XFRM_MODE_TUNNEL) { 156 if (x->props.mode == XFRM_MODE_TUNNEL) {
435 err = ipcomp6_tunnel_attach(x); 157 err = ipcomp6_tunnel_attach(x);
436 if (err) 158 if (err)
437 goto error_tunnel; 159 goto error_tunnel;
438 } 160 }
439 161
440 calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
441 BUG_ON(!calg_desc);
442 ipcd->threshold = calg_desc->uinfo.comp.threshold;
443 x->data = ipcd;
444 err = 0; 162 err = 0;
445out: 163out:
446 return err; 164 return err;
447error_tunnel: 165error_tunnel:
448 mutex_lock(&ipcomp6_resource_mutex); 166 ipcomp_destroy(x);
449error:
450 ipcomp6_free_data(ipcd);
451 mutex_unlock(&ipcomp6_resource_mutex);
452 kfree(ipcd);
453 167
454 goto out; 168 goto out;
455} 169}
@@ -460,9 +174,9 @@ static const struct xfrm_type ipcomp6_type =
460 .owner = THIS_MODULE, 174 .owner = THIS_MODULE,
461 .proto = IPPROTO_COMP, 175 .proto = IPPROTO_COMP,
462 .init_state = ipcomp6_init_state, 176 .init_state = ipcomp6_init_state,
463 .destructor = ipcomp6_destroy, 177 .destructor = ipcomp_destroy,
464 .input = ipcomp6_input, 178 .input = ipcomp_input,
465 .output = ipcomp6_output, 179 .output = ipcomp_output,
466 .hdr_offset = xfrm6_find_1stfragopt, 180 .hdr_offset = xfrm6_find_1stfragopt,
467}; 181};
468 182
diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig
index 9201ef8ad90e..6d081674515f 100644
--- a/net/xfrm/Kconfig
+++ b/net/xfrm/Kconfig
@@ -46,6 +46,12 @@ config XFRM_STATISTICS
46 46
47 If unsure, say N. 47 If unsure, say N.
48 48
49config XFRM_IPCOMP
50 tristate
51 select XFRM
52 select CRYPTO
53 select CRYPTO_DEFLATE
54
49config NET_KEY 55config NET_KEY
50 tristate "PF_KEY sockets" 56 tristate "PF_KEY sockets"
51 select XFRM 57 select XFRM
diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile
index 332cfb0ff566..0f439a72ccab 100644
--- a/net/xfrm/Makefile
+++ b/net/xfrm/Makefile
@@ -6,4 +6,5 @@ obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
6 xfrm_input.o xfrm_output.o xfrm_algo.o 6 xfrm_input.o xfrm_output.o xfrm_algo.o
7obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o 7obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o
8obj-$(CONFIG_XFRM_USER) += xfrm_user.o 8obj-$(CONFIG_XFRM_USER) += xfrm_user.o
9obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o
9 10
diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
new file mode 100644
index 000000000000..b51e804fbbad
--- /dev/null
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -0,0 +1,349 @@
1/*
2 * IP Payload Compression Protocol (IPComp) - RFC3173.
3 *
4 * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
5 * Copyright (c) 2003-2008 Herbert Xu <herbert@gondor.apana.org.au>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * Todo:
13 * - Tunable compression parameters.
14 * - Compression stats.
15 * - Adaptive compression.
16 */
17
18#include <linux/crypto.h>
19#include <linux/err.h>
20#include <linux/list.h>
21#include <linux/module.h>
22#include <linux/mutex.h>
23#include <linux/percpu.h>
24#include <linux/rtnetlink.h>
25#include <linux/smp.h>
26#include <linux/vmalloc.h>
27#include <net/ip.h>
28#include <net/ipcomp.h>
29#include <net/xfrm.h>
30
31struct ipcomp_tfms {
32 struct list_head list;
33 struct crypto_comp **tfms;
34 int users;
35};
36
37static DEFINE_MUTEX(ipcomp_resource_mutex);
38static void **ipcomp_scratches;
39static int ipcomp_scratch_users;
40static LIST_HEAD(ipcomp_tfms_list);
41
42static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
43{
44 struct ipcomp_data *ipcd = x->data;
45 const int plen = skb->len;
46 int dlen = IPCOMP_SCRATCH_SIZE;
47 const u8 *start = skb->data;
48 const int cpu = get_cpu();
49 u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
50 struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
51 int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
52
53 if (err)
54 goto out;
55
56 if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
57 err = -EINVAL;
58 goto out;
59 }
60
61 err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
62 if (err)
63 goto out;
64
65 skb->truesize += dlen - plen;
66 __skb_put(skb, dlen - plen);
67 skb_copy_to_linear_data(skb, scratch, dlen);
68out:
69 put_cpu();
70 return err;
71}
72
73int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
74{
75 int nexthdr;
76 int err = -ENOMEM;
77 struct ip_comp_hdr *ipch;
78
79 if (skb_linearize_cow(skb))
80 goto out;
81
82 skb->ip_summed = CHECKSUM_NONE;
83
84 /* Remove ipcomp header and decompress original payload */
85 ipch = (void *)skb->data;
86 nexthdr = ipch->nexthdr;
87
88 skb->transport_header = skb->network_header + sizeof(*ipch);
89 __skb_pull(skb, sizeof(*ipch));
90 err = ipcomp_decompress(x, skb);
91 if (err)
92 goto out;
93
94 err = nexthdr;
95
96out:
97 return err;
98}
99EXPORT_SYMBOL_GPL(ipcomp_input);
100
101static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
102{
103 struct ipcomp_data *ipcd = x->data;
104 const int plen = skb->len;
105 int dlen = IPCOMP_SCRATCH_SIZE;
106 u8 *start = skb->data;
107 const int cpu = get_cpu();
108 u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
109 struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
110 int err;
111
112 local_bh_disable();
113 err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
114 local_bh_enable();
115 if (err)
116 goto out;
117
118 if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
119 err = -EMSGSIZE;
120 goto out;
121 }
122
123 memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
124 put_cpu();
125
126 pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
127 return 0;
128
129out:
130 put_cpu();
131 return err;
132}
133
134int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
135{
136 int err;
137 struct ip_comp_hdr *ipch;
138 struct ipcomp_data *ipcd = x->data;
139
140 if (skb->len < ipcd->threshold) {
141 /* Don't bother compressing */
142 goto out_ok;
143 }
144
145 if (skb_linearize_cow(skb))
146 goto out_ok;
147
148 err = ipcomp_compress(x, skb);
149
150 if (err) {
151 goto out_ok;
152 }
153
154 /* Install ipcomp header, convert into ipcomp datagram. */
155 ipch = ip_comp_hdr(skb);
156 ipch->nexthdr = *skb_mac_header(skb);
157 ipch->flags = 0;
158 ipch->cpi = htons((u16 )ntohl(x->id.spi));
159 *skb_mac_header(skb) = IPPROTO_COMP;
160out_ok:
161 skb_push(skb, -skb_network_offset(skb));
162 return 0;
163}
164EXPORT_SYMBOL_GPL(ipcomp_output);
165
166static void ipcomp_free_scratches(void)
167{
168 int i;
169 void **scratches;
170
171 if (--ipcomp_scratch_users)
172 return;
173
174 scratches = ipcomp_scratches;
175 if (!scratches)
176 return;
177
178 for_each_possible_cpu(i)
179 vfree(*per_cpu_ptr(scratches, i));
180
181 free_percpu(scratches);
182}
183
184static void **ipcomp_alloc_scratches(void)
185{
186 int i;
187 void **scratches;
188
189 if (ipcomp_scratch_users++)
190 return ipcomp_scratches;
191
192 scratches = alloc_percpu(void *);
193 if (!scratches)
194 return NULL;
195
196 ipcomp_scratches = scratches;
197
198 for_each_possible_cpu(i) {
199 void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
200 if (!scratch)
201 return NULL;
202 *per_cpu_ptr(scratches, i) = scratch;
203 }
204
205 return scratches;
206}
207
208static void ipcomp_free_tfms(struct crypto_comp **tfms)
209{
210 struct ipcomp_tfms *pos;
211 int cpu;
212
213 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
214 if (pos->tfms == tfms)
215 break;
216 }
217
218 BUG_TRAP(pos);
219
220 if (--pos->users)
221 return;
222
223 list_del(&pos->list);
224 kfree(pos);
225
226 if (!tfms)
227 return;
228
229 for_each_possible_cpu(cpu) {
230 struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
231 crypto_free_comp(tfm);
232 }
233 free_percpu(tfms);
234}
235
236static struct crypto_comp **ipcomp_alloc_tfms(const char *alg_name)
237{
238 struct ipcomp_tfms *pos;
239 struct crypto_comp **tfms;
240 int cpu;
241
242 /* This can be any valid CPU ID so we don't need locking. */
243 cpu = raw_smp_processor_id();
244
245 list_for_each_entry(pos, &ipcomp_tfms_list, list) {
246 struct crypto_comp *tfm;
247
248 tfms = pos->tfms;
249 tfm = *per_cpu_ptr(tfms, cpu);
250
251 if (!strcmp(crypto_comp_name(tfm), alg_name)) {
252 pos->users++;
253 return tfms;
254 }
255 }
256
257 pos = kmalloc(sizeof(*pos), GFP_KERNEL);
258 if (!pos)
259 return NULL;
260
261 pos->users = 1;
262 INIT_LIST_HEAD(&pos->list);
263 list_add(&pos->list, &ipcomp_tfms_list);
264
265 pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
266 if (!tfms)
267 goto error;
268
269 for_each_possible_cpu(cpu) {
270 struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
271 CRYPTO_ALG_ASYNC);
272 if (IS_ERR(tfm))
273 goto error;
274 *per_cpu_ptr(tfms, cpu) = tfm;
275 }
276
277 return tfms;
278
279error:
280 ipcomp_free_tfms(tfms);
281 return NULL;
282}
283
284static void ipcomp_free_data(struct ipcomp_data *ipcd)
285{
286 if (ipcd->tfms)
287 ipcomp_free_tfms(ipcd->tfms);
288 ipcomp_free_scratches();
289}
290
291void ipcomp_destroy(struct xfrm_state *x)
292{
293 struct ipcomp_data *ipcd = x->data;
294 if (!ipcd)
295 return;
296 xfrm_state_delete_tunnel(x);
297 mutex_lock(&ipcomp_resource_mutex);
298 ipcomp_free_data(ipcd);
299 mutex_unlock(&ipcomp_resource_mutex);
300 kfree(ipcd);
301}
302EXPORT_SYMBOL_GPL(ipcomp_destroy);
303
304int ipcomp_init_state(struct xfrm_state *x)
305{
306 int err;
307 struct ipcomp_data *ipcd;
308 struct xfrm_algo_desc *calg_desc;
309
310 err = -EINVAL;
311 if (!x->calg)
312 goto out;
313
314 if (x->encap)
315 goto out;
316
317 err = -ENOMEM;
318 ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
319 if (!ipcd)
320 goto out;
321
322 mutex_lock(&ipcomp_resource_mutex);
323 if (!ipcomp_alloc_scratches())
324 goto error;
325
326 ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name);
327 if (!ipcd->tfms)
328 goto error;
329 mutex_unlock(&ipcomp_resource_mutex);
330
331 calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
332 BUG_ON(!calg_desc);
333 ipcd->threshold = calg_desc->uinfo.comp.threshold;
334 x->data = ipcd;
335 err = 0;
336out:
337 return err;
338
339error:
340 ipcomp_free_data(ipcd);
341 mutex_unlock(&ipcomp_resource_mutex);
342 kfree(ipcd);
343 goto out;
344}
345EXPORT_SYMBOL_GPL(ipcomp_init_state);
346
347MODULE_LICENSE("GPL");
348MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173");
349MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 16:36:06 -0500