mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
ah4: convert to ahash
This patch converts ah4 to the new ahash interface. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert
David S. Miller
parent
49cbf95248
commit
dff3bb0626
299
net/ipv4/ah4.c
299
net/ipv4/ah4.c
@ -1,3 +1,4 @@
|
||||
#include <crypto/hash.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/module.h>
|
||||
#include <net/ip.h>
|
||||
@ -5,10 +6,67 @@
|
||||
#include <net/ah.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/pfkeyv2.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <net/icmp.h>
|
||||
#include <net/protocol.h>
|
||||
|
||||
struct ah_skb_cb {
|
||||
struct xfrm_skb_cb xfrm;
|
||||
void *tmp;
|
||||
};
|
||||
|
||||
#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
|
||||
|
||||
static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
|
||||
unsigned int size)
|
||||
{
|
||||
unsigned int len;
|
||||
|
||||
len = size + crypto_ahash_digestsize(ahash) +
|
||||
(crypto_ahash_alignmask(ahash) &
|
||||
~(crypto_tfm_ctx_alignment() - 1));
|
||||
|
||||
len = ALIGN(len, crypto_tfm_ctx_alignment());
|
||||
|
||||
len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
|
||||
len = ALIGN(len, __alignof__(struct scatterlist));
|
||||
|
||||
len += sizeof(struct scatterlist) * nfrags;
|
||||
|
||||
return kmalloc(len, GFP_ATOMIC);
|
||||
}
|
||||
|
||||
static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)
|
||||
{
|
||||
return tmp + offset;
|
||||
}
|
||||
|
||||
static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
|
||||
unsigned int offset)
|
||||
{
|
||||
return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
|
||||
}
|
||||
|
||||
static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
|
||||
u8 *icv)
|
||||
{
|
||||
struct ahash_request *req;
|
||||
|
||||
req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
|
||||
crypto_tfm_ctx_alignment());
|
||||
|
||||
ahash_request_set_tfm(req, ahash);
|
||||
|
||||
return req;
|
||||
}
|
||||
|
||||
static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
|
||||
struct ahash_request *req)
|
||||
{
|
||||
return (void *)ALIGN((unsigned long)(req + 1) +
|
||||
crypto_ahash_reqsize(ahash),
|
||||
__alignof__(struct scatterlist));
|
||||
}
|
||||
|
||||
/* Clear mutable options and find final destination to substitute
|
||||
* into IP header for icv calculation. Options are already checked
|
||||
@ -54,20 +112,72 @@ static int ip_clear_mutable_options(struct iphdr *iph, __be32 *daddr)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ah_output_done(struct crypto_async_request *base, int err)
|
||||
{
|
||||
u8 *icv;
|
||||
struct iphdr *iph;
|
||||
struct sk_buff *skb = base->data;
|
||||
struct xfrm_state *x = skb_dst(skb)->xfrm;
|
||||
struct ah_data *ahp = x->data;
|
||||
struct iphdr *top_iph = ip_hdr(skb);
|
||||
struct ip_auth_hdr *ah = ip_auth_hdr(skb);
|
||||
int ihl = ip_hdrlen(skb);
|
||||
|
||||
iph = AH_SKB_CB(skb)->tmp;
|
||||
icv = ah_tmp_icv(ahp->ahash, iph, ihl);
|
||||
memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
|
||||
|
||||
top_iph->tos = iph->tos;
|
||||
top_iph->ttl = iph->ttl;
|
||||
top_iph->frag_off = iph->frag_off;
|
||||
if (top_iph->ihl != 5) {
|
||||
top_iph->daddr = iph->daddr;
|
||||
memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
|
||||
}
|
||||
|
||||
err = ah->nexthdr;
|
||||
|
||||
kfree(AH_SKB_CB(skb)->tmp);
|
||||
xfrm_output_resume(skb, err);
|
||||
}
|
||||
|
||||
static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
{
|
||||
int err;
|
||||
int nfrags;
|
||||
int ihl;
|
||||
u8 *icv;
|
||||
struct sk_buff *trailer;
|
||||
struct crypto_ahash *ahash;
|
||||
struct ahash_request *req;
|
||||
struct scatterlist *sg;
|
||||
struct iphdr *iph, *top_iph;
|
||||
struct ip_auth_hdr *ah;
|
||||
struct ah_data *ahp;
|
||||
union {
|
||||
struct iphdr iph;
|
||||
char buf[60];
|
||||
} tmp_iph;
|
||||
|
||||
ahp = x->data;
|
||||
ahash = ahp->ahash;
|
||||
|
||||
if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
|
||||
goto out;
|
||||
nfrags = err;
|
||||
|
||||
skb_push(skb, -skb_network_offset(skb));
|
||||
ah = ip_auth_hdr(skb);
|
||||
ihl = ip_hdrlen(skb);
|
||||
|
||||
err = -ENOMEM;
|
||||
iph = ah_alloc_tmp(ahash, nfrags, ihl);
|
||||
if (!iph)
|
||||
goto out;
|
||||
|
||||
icv = ah_tmp_icv(ahash, iph, ihl);
|
||||
req = ah_tmp_req(ahash, icv);
|
||||
sg = ah_req_sg(ahash, req);
|
||||
|
||||
memset(ah->auth_data, 0, ahp->icv_trunc_len);
|
||||
|
||||
top_iph = ip_hdr(skb);
|
||||
iph = &tmp_iph.iph;
|
||||
|
||||
iph->tos = top_iph->tos;
|
||||
iph->ttl = top_iph->ttl;
|
||||
@ -78,10 +188,9 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
|
||||
err = ip_clear_mutable_options(top_iph, &top_iph->daddr);
|
||||
if (err)
|
||||
goto error;
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
ah = ip_auth_hdr(skb);
|
||||
ah->nexthdr = *skb_mac_header(skb);
|
||||
*skb_mac_header(skb) = IPPROTO_AH;
|
||||
|
||||
@ -91,20 +200,31 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
top_iph->ttl = 0;
|
||||
top_iph->check = 0;
|
||||
|
||||
ahp = x->data;
|
||||
ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
|
||||
|
||||
ah->reserved = 0;
|
||||
ah->spi = x->id.spi;
|
||||
ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
|
||||
|
||||
spin_lock_bh(&x->lock);
|
||||
err = ah_mac_digest(ahp, skb, ah->auth_data);
|
||||
memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
|
||||
spin_unlock_bh(&x->lock);
|
||||
sg_init_table(sg, nfrags);
|
||||
skb_to_sgvec(skb, sg, 0, skb->len);
|
||||
|
||||
if (err)
|
||||
goto error;
|
||||
ahash_request_set_crypt(req, sg, icv, skb->len);
|
||||
ahash_request_set_callback(req, 0, ah_output_done, skb);
|
||||
|
||||
AH_SKB_CB(skb)->tmp = iph;
|
||||
|
||||
err = crypto_ahash_digest(req);
|
||||
if (err) {
|
||||
if (err == -EINPROGRESS)
|
||||
goto out;
|
||||
|
||||
if (err == -EBUSY)
|
||||
err = NET_XMIT_DROP;
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
|
||||
|
||||
top_iph->tos = iph->tos;
|
||||
top_iph->ttl = iph->ttl;
|
||||
@ -114,28 +234,67 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
|
||||
memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
|
||||
}
|
||||
|
||||
err = 0;
|
||||
|
||||
error:
|
||||
out_free:
|
||||
kfree(iph);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void ah_input_done(struct crypto_async_request *base, int err)
|
||||
{
|
||||
u8 *auth_data;
|
||||
u8 *icv;
|
||||
struct iphdr *work_iph;
|
||||
struct sk_buff *skb = base->data;
|
||||
struct xfrm_state *x = xfrm_input_state(skb);
|
||||
struct ah_data *ahp = x->data;
|
||||
struct ip_auth_hdr *ah = ip_auth_hdr(skb);
|
||||
int ihl = ip_hdrlen(skb);
|
||||
int ah_hlen = (ah->hdrlen + 2) << 2;
|
||||
|
||||
work_iph = AH_SKB_CB(skb)->tmp;
|
||||
auth_data = ah_tmp_auth(work_iph, ihl);
|
||||
icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
|
||||
|
||||
err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
skb->network_header += ah_hlen;
|
||||
memcpy(skb_network_header(skb), work_iph, ihl);
|
||||
__skb_pull(skb, ah_hlen + ihl);
|
||||
skb_set_transport_header(skb, -ihl);
|
||||
|
||||
err = ah->nexthdr;
|
||||
out:
|
||||
kfree(AH_SKB_CB(skb)->tmp);
|
||||
xfrm_input_resume(skb, err);
|
||||
}
|
||||
|
||||
static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
|
||||
{
|
||||
int ah_hlen;
|
||||
int ihl;
|
||||
int nexthdr;
|
||||
int err = -EINVAL;
|
||||
struct iphdr *iph;
|
||||
int nfrags;
|
||||
u8 *auth_data;
|
||||
u8 *icv;
|
||||
struct sk_buff *trailer;
|
||||
struct crypto_ahash *ahash;
|
||||
struct ahash_request *req;
|
||||
struct scatterlist *sg;
|
||||
struct iphdr *iph, *work_iph;
|
||||
struct ip_auth_hdr *ah;
|
||||
struct ah_data *ahp;
|
||||
char work_buf[60];
|
||||
int err = -ENOMEM;
|
||||
|
||||
if (!pskb_may_pull(skb, sizeof(*ah)))
|
||||
goto out;
|
||||
|
||||
ah = (struct ip_auth_hdr *)skb->data;
|
||||
ahp = x->data;
|
||||
ahash = ahp->ahash;
|
||||
|
||||
nexthdr = ah->nexthdr;
|
||||
ah_hlen = (ah->hdrlen + 2) << 2;
|
||||
|
||||
@ -156,9 +315,24 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
|
||||
|
||||
ah = (struct ip_auth_hdr *)skb->data;
|
||||
iph = ip_hdr(skb);
|
||||
ihl = ip_hdrlen(skb);
|
||||
|
||||
ihl = skb->data - skb_network_header(skb);
|
||||
memcpy(work_buf, iph, ihl);
|
||||
if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
|
||||
goto out;
|
||||
nfrags = err;
|
||||
|
||||
work_iph = ah_alloc_tmp(ahash, nfrags, ihl + ahp->icv_trunc_len);
|
||||
if (!work_iph)
|
||||
goto out;
|
||||
|
||||
auth_data = ah_tmp_auth(work_iph, ihl);
|
||||
icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
|
||||
req = ah_tmp_req(ahash, icv);
|
||||
sg = ah_req_sg(ahash, req);
|
||||
|
||||
memcpy(work_iph, iph, ihl);
|
||||
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
|
||||
memset(ah->auth_data, 0, ahp->icv_trunc_len);
|
||||
|
||||
iph->ttl = 0;
|
||||
iph->tos = 0;
|
||||
@ -166,35 +340,44 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
|
||||
iph->check = 0;
|
||||
if (ihl > sizeof(*iph)) {
|
||||
__be32 dummy;
|
||||
if (ip_clear_mutable_options(iph, &dummy))
|
||||
goto out;
|
||||
}
|
||||
|
||||
spin_lock(&x->lock);
|
||||
{
|
||||
u8 auth_data[MAX_AH_AUTH_LEN];
|
||||
|
||||
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
|
||||
skb_push(skb, ihl);
|
||||
err = ah_mac_digest(ahp, skb, ah->auth_data);
|
||||
err = ip_clear_mutable_options(iph, &dummy);
|
||||
if (err)
|
||||
goto unlock;
|
||||
if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len))
|
||||
err = -EBADMSG;
|
||||
goto out_free;
|
||||
}
|
||||
unlock:
|
||||
spin_unlock(&x->lock);
|
||||
|
||||
skb_push(skb, ihl);
|
||||
|
||||
sg_init_table(sg, nfrags);
|
||||
skb_to_sgvec(skb, sg, 0, skb->len);
|
||||
|
||||
ahash_request_set_crypt(req, sg, icv, skb->len);
|
||||
ahash_request_set_callback(req, 0, ah_input_done, skb);
|
||||
|
||||
AH_SKB_CB(skb)->tmp = work_iph;
|
||||
|
||||
err = crypto_ahash_digest(req);
|
||||
if (err) {
|
||||
if (err == -EINPROGRESS)
|
||||
goto out;
|
||||
|
||||
if (err == -EBUSY)
|
||||
err = NET_XMIT_DROP;
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
|
||||
if (err)
|
||||
goto out;
|
||||
goto out_free;
|
||||
|
||||
skb->network_header += ah_hlen;
|
||||
memcpy(skb_network_header(skb), work_buf, ihl);
|
||||
skb->transport_header = skb->network_header;
|
||||
memcpy(skb_network_header(skb), work_iph, ihl);
|
||||
__skb_pull(skb, ah_hlen + ihl);
|
||||
skb_set_transport_header(skb, -ihl);
|
||||
|
||||
return nexthdr;
|
||||
err = nexthdr;
|
||||
|
||||
out_free:
|
||||
kfree (work_iph);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
@ -222,7 +405,7 @@ static int ah_init_state(struct xfrm_state *x)
|
||||
{
|
||||
struct ah_data *ahp = NULL;
|
||||
struct xfrm_algo_desc *aalg_desc;
|
||||
struct crypto_hash *tfm;
|
||||
struct crypto_ahash *ahash;
|
||||
|
||||
if (!x->aalg)
|
||||
goto error;
|
||||
@ -231,31 +414,31 @@ static int ah_init_state(struct xfrm_state *x)
|
||||
goto error;
|
||||
|
||||
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
|
||||
if (ahp == NULL)
|
||||
if (!ahp)
|
||||
return -ENOMEM;
|
||||
|
||||
tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC);
|
||||
if (IS_ERR(tfm))
|
||||
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
|
||||
if (IS_ERR(ahash))
|
||||
goto error;
|
||||
|
||||
ahp->tfm = tfm;
|
||||
if (crypto_hash_setkey(tfm, x->aalg->alg_key,
|
||||
(x->aalg->alg_key_len + 7) / 8))
|
||||
ahp->ahash = ahash;
|
||||
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
|
||||
(x->aalg->alg_key_len + 7) / 8))
|
||||
goto error;
|
||||
|
||||
/*
|
||||
* Lookup the algorithm description maintained by xfrm_algo,
|
||||
* verify crypto transform properties, and store information
|
||||
* we need for AH processing. This lookup cannot fail here
|
||||
* after a successful crypto_alloc_hash().
|
||||
* after a successful crypto_alloc_ahash().
|
||||
*/
|
||||
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
||||
BUG_ON(!aalg_desc);
|
||||
|
||||
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
||||
crypto_hash_digestsize(tfm)) {
|
||||
crypto_ahash_digestsize(ahash)) {
|
||||
printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
|
||||
x->aalg->alg_name, crypto_hash_digestsize(tfm),
|
||||
x->aalg->alg_name, crypto_ahash_digestsize(ahash),
|
||||
aalg_desc->uinfo.auth.icv_fullbits/8);
|
||||
goto error;
|
||||
}
|
||||
@ -265,10 +448,6 @@ static int ah_init_state(struct xfrm_state *x)
|
||||
|
||||
BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN);
|
||||
|
||||
ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL);
|
||||
if (!ahp->work_icv)
|
||||
goto error;
|
||||
|
||||
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
|
||||
ahp->icv_trunc_len);
|
||||
if (x->props.mode == XFRM_MODE_TUNNEL)
|
||||
@ -279,8 +458,7 @@ static int ah_init_state(struct xfrm_state *x)
|
||||
|
||||
error:
|
||||
if (ahp) {
|
||||
kfree(ahp->work_icv);
|
||||
crypto_free_hash(ahp->tfm);
|
||||
crypto_free_ahash(ahp->ahash);
|
||||
kfree(ahp);
|
||||
}
|
||||
return -EINVAL;
|
||||
@ -293,8 +471,7 @@ static void ah_destroy(struct xfrm_state *x)
|
||||
if (!ahp)
|
||||
return;
|
||||
|
||||
kfree(ahp->work_icv);
|
||||
crypto_free_hash(ahp->tfm);
|
||||
crypto_free_ahash(ahp->ahash);
|
||||
kfree(ahp);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user