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linux-2.6/net/xfrm/xfrm_algo.c
David S. Miller 1a028e5072 [NET]: Revert sk_buff walker cleanups. 
This reverts eefa390628

The simplification made in that change works with the assumption that
the 'offset' parameter to these functions is always positive or zero,
which is not true.  It can be and often is negative in order to access
SKB header values in front of skb->data.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-27 15:21:23 -07:00

625 lines
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/*
* xfrm algorithm interface
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/crypto.h>
#include <net/xfrm.h>
#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
#include <net/ah.h>
#endif
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
#include <net/esp.h>
#endif
#include <asm/scatterlist.h>
/*
* Algorithms supported by IPsec. These entries contain properties which
* are used in key negotiation and xfrm processing, and are used to verify
* that instantiated crypto transforms have correct parameters for IPsec
* purposes.
*/
static struct xfrm_algo_desc aalg_list[] = {
{
.name = "hmac(digest_null)",
.compat = "digest_null",
.uinfo = {
.auth = {
.icv_truncbits = 0,
.icv_fullbits = 0,
}
},
.desc = {
.sadb_alg_id = SADB_X_AALG_NULL,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 0,
.sadb_alg_maxbits = 0
}
},
{
.name = "hmac(md5)",
.compat = "md5",
.uinfo = {
.auth = {
.icv_truncbits = 96,
.icv_fullbits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_AALG_MD5HMAC,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 128
}
},
{
.name = "hmac(sha1)",
.compat = "sha1",
.uinfo = {
.auth = {
.icv_truncbits = 96,
.icv_fullbits = 160,
}
},
.desc = {
.sadb_alg_id = SADB_AALG_SHA1HMAC,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 160,
.sadb_alg_maxbits = 160
}
},
{
.name = "hmac(sha256)",
.compat = "sha256",
.uinfo = {
.auth = {
.icv_truncbits = 96,
.icv_fullbits = 256,
}
},
.desc = {
.sadb_alg_id = SADB_X_AALG_SHA2_256HMAC,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 256,
.sadb_alg_maxbits = 256
}
},
{
.name = "hmac(ripemd160)",
.compat = "ripemd160",
.uinfo = {
.auth = {
.icv_truncbits = 96,
.icv_fullbits = 160,
}
},
.desc = {
.sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 160,
.sadb_alg_maxbits = 160
}
},
{
.name = "xcbc(aes)",
.uinfo = {
.auth = {
.icv_truncbits = 96,
.icv_fullbits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 128
}
},
};
static struct xfrm_algo_desc ealg_list[] = {
{
.name = "ecb(cipher_null)",
.compat = "cipher_null",
.uinfo = {
.encr = {
.blockbits = 8,
.defkeybits = 0,
}
},
.desc = {
.sadb_alg_id = SADB_EALG_NULL,
.sadb_alg_ivlen = 0,
.sadb_alg_minbits = 0,
.sadb_alg_maxbits = 0
}
},
{
.name = "cbc(des)",
.compat = "des",
.uinfo = {
.encr = {
.blockbits = 64,
.defkeybits = 64,
}
},
.desc = {
.sadb_alg_id = SADB_EALG_DESCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 64,
.sadb_alg_maxbits = 64
}
},
{
.name = "cbc(des3_ede)",
.compat = "des3_ede",
.uinfo = {
.encr = {
.blockbits = 64,
.defkeybits = 192,
}
},
.desc = {
.sadb_alg_id = SADB_EALG_3DESCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 192,
.sadb_alg_maxbits = 192
}
},
{
.name = "cbc(cast128)",
.compat = "cast128",
.uinfo = {
.encr = {
.blockbits = 64,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_CASTCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 40,
.sadb_alg_maxbits = 128
}
},
{
.name = "cbc(blowfish)",
.compat = "blowfish",
.uinfo = {
.encr = {
.blockbits = 64,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_BLOWFISHCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 40,
.sadb_alg_maxbits = 448
}
},
{
.name = "cbc(aes)",
.compat = "aes",
.uinfo = {
.encr = {
.blockbits = 128,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_AESCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 256
}
},
{
.name = "cbc(serpent)",
.compat = "serpent",
.uinfo = {
.encr = {
.blockbits = 128,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_SERPENTCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 256,
}
},
{
.name = "cbc(camellia)",
.uinfo = {
.encr = {
.blockbits = 128,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_CAMELLIACBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 256
}
},
{
.name = "cbc(twofish)",
.compat = "twofish",
.uinfo = {
.encr = {
.blockbits = 128,
.defkeybits = 128,
}
},
.desc = {
.sadb_alg_id = SADB_X_EALG_TWOFISHCBC,
.sadb_alg_ivlen = 8,
.sadb_alg_minbits = 128,
.sadb_alg_maxbits = 256
}
},
};
static struct xfrm_algo_desc calg_list[] = {
{
.name = "deflate",
.uinfo = {
.comp = {
.threshold = 90,
}
},
.desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE }
},
{
.name = "lzs",
.uinfo = {
.comp = {
.threshold = 90,
}
},
.desc = { .sadb_alg_id = SADB_X_CALG_LZS }
},
{
.name = "lzjh",
.uinfo = {
.comp = {
.threshold = 50,
}
},
.desc = { .sadb_alg_id = SADB_X_CALG_LZJH }
},
};
static inline int aalg_entries(void)
{
return ARRAY_SIZE(aalg_list);
}
static inline int ealg_entries(void)
{
return ARRAY_SIZE(ealg_list);
}
static inline int calg_entries(void)
{
return ARRAY_SIZE(calg_list);
}
/* Todo: generic iterators */
struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id)
{
int i;
for (i = 0; i < aalg_entries(); i++) {
if (aalg_list[i].desc.sadb_alg_id == alg_id) {
if (aalg_list[i].available)
return &aalg_list[i];
else
break;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid);
struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id)
{
int i;
for (i = 0; i < ealg_entries(); i++) {
if (ealg_list[i].desc.sadb_alg_id == alg_id) {
if (ealg_list[i].available)
return &ealg_list[i];
else
break;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid);
struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id)
{
int i;
for (i = 0; i < calg_entries(); i++) {
if (calg_list[i].desc.sadb_alg_id == alg_id) {
if (calg_list[i].available)
return &calg_list[i];
else
break;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(xfrm_calg_get_byid);
static struct xfrm_algo_desc *xfrm_get_byname(struct xfrm_algo_desc *list,
int entries, u32 type, u32 mask,
char *name, int probe)
{
int i, status;
if (!name)
return NULL;
for (i = 0; i < entries; i++) {
if (strcmp(name, list[i].name) &&
(!list[i].compat || strcmp(name, list[i].compat)))
continue;
if (list[i].available)
return &list[i];
if (!probe)
break;
status = crypto_has_alg(list[i].name, type,
mask | CRYPTO_ALG_ASYNC);
if (!status)
break;
list[i].available = status;
return &list[i];
}
return NULL;
}
struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe)
{
return xfrm_get_byname(aalg_list, aalg_entries(),
CRYPTO_ALG_TYPE_HASH, CRYPTO_ALG_TYPE_HASH_MASK,
name, probe);
}
EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname);
struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe)
{
return xfrm_get_byname(ealg_list, ealg_entries(),
CRYPTO_ALG_TYPE_BLKCIPHER, CRYPTO_ALG_TYPE_MASK,
name, probe);
}
EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname);
struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe)
{
return xfrm_get_byname(calg_list, calg_entries(),
CRYPTO_ALG_TYPE_COMPRESS, CRYPTO_ALG_TYPE_MASK,
name, probe);
}
EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
{
if (idx >= aalg_entries())
return NULL;
return &aalg_list[idx];
}
EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx);
struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx)
{
if (idx >= ealg_entries())
return NULL;
return &ealg_list[idx];
}
EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx);
/*
* Probe for the availability of crypto algorithms, and set the available
* flag for any algorithms found on the system. This is typically called by
* pfkey during userspace SA add, update or register.
*/
void xfrm_probe_algs(void)
{
#ifdef CONFIG_CRYPTO
int i, status;
BUG_ON(in_softirq());
for (i = 0; i < aalg_entries(); i++) {
status = crypto_has_hash(aalg_list[i].name, 0,
CRYPTO_ALG_ASYNC);
if (aalg_list[i].available != status)
aalg_list[i].available = status;
}
for (i = 0; i < ealg_entries(); i++) {
status = crypto_has_blkcipher(ealg_list[i].name, 0,
CRYPTO_ALG_ASYNC);
if (ealg_list[i].available != status)
ealg_list[i].available = status;
}
for (i = 0; i < calg_entries(); i++) {
status = crypto_has_comp(calg_list[i].name, 0,
CRYPTO_ALG_ASYNC);
if (calg_list[i].available != status)
calg_list[i].available = status;
}
#endif
}
EXPORT_SYMBOL_GPL(xfrm_probe_algs);
int xfrm_count_auth_supported(void)
{
int i, n;
for (i = 0, n = 0; i < aalg_entries(); i++)
if (aalg_list[i].available)
n++;
return n;
}
EXPORT_SYMBOL_GPL(xfrm_count_auth_supported);
int xfrm_count_enc_supported(void)
{
int i, n;
for (i = 0, n = 0; i < ealg_entries(); i++)
if (ealg_list[i].available)
n++;
return n;
}
EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
/* Move to common area: it is shared with AH. */
int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
int offset, int len, icv_update_fn_t icv_update)
{
int start = skb_headlen(skb);
int i, copy = start - offset;
int err;
struct scatterlist sg;
/* Checksum header. */
if (copy > 0) {
if (copy > len)
copy = len;
sg.page = virt_to_page(skb->data + offset);
sg.offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
sg.length = copy;
err = icv_update(desc, &sg, copy);
if (unlikely(err))
return err;
if ((len -= copy) == 0)
return 0;
offset += copy;
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
BUG_TRAP(start <= offset + len);
end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
if (copy > len)
copy = len;
sg.page = frag->page;
sg.offset = frag->page_offset + offset-start;
sg.length = copy;
err = icv_update(desc, &sg, copy);
if (unlikely(err))
return err;
if (!(len -= copy))
return 0;
offset += copy;
}
start = end;
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
for (; list; list = list->next) {
int end;
BUG_TRAP(start <= offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
err = skb_icv_walk(list, desc, offset-start,
copy, icv_update);
if (unlikely(err))
return err;
if ((len -= copy) == 0)
return 0;
offset += copy;
}
start = end;
}
}
BUG_ON(len);
return 0;
}
EXPORT_SYMBOL_GPL(skb_icv_walk);
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
{
if (tail != skb) {
skb->data_len += len;
skb->len += len;
}
return skb_put(tail, len);
}
EXPORT_SYMBOL_GPL(pskb_put);
#endif
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