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[XFRM] netlink: Move algorithm length calculation to its own function 

Adds alg_len() to calculate the properly padded length of an
algorithm attribute to simplify the code.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2007-08-22 13:56:23 -07:00 committed by David S. Miller
parent c0144beaec
commit c26445acbc
1 changed files with 12 additions and 13 deletions
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25
net/xfrm/xfrm_user.c
View File

@ -33,6 +33,11 @@
#endif #endif
#include <linux/audit.h> #include <linux/audit.h>
static inline int alg_len(struct xfrm_algo *alg)
{
return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
}
static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type) static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{ {
struct rtattr *rt = xfrma[type - 1]; struct rtattr *rt = xfrma[type - 1];
@ -232,7 +237,6 @@ static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
struct rtattr *rta = u_arg; struct rtattr *rta = u_arg;
struct xfrm_algo *p, *ualg; struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo; struct xfrm_algo_desc *algo;
int len;
if (!rta) if (!rta)
return 0; return 0;
@ -244,8 +248,7 @@ static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
return -ENOSYS; return -ENOSYS;
*props = algo->desc.sadb_alg_id; *props = algo->desc.sadb_alg_id;
len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8; p = kmemdup(ualg, alg_len(ualg), GFP_KERNEL);
p = kmemdup(ualg, len, GFP_KERNEL);
if (!p) if (!p)
return -ENOMEM; return -ENOMEM;
@ -617,11 +620,9 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
copy_to_user_state(x, p); copy_to_user_state(x, p);
if (x->aalg) if (x->aalg)
NLA_PUT(skb, XFRMA_ALG_AUTH, NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg);
sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
if (x->ealg) if (x->ealg)
NLA_PUT(skb, XFRMA_ALG_CRYPT, NLA_PUT(skb, XFRMA_ALG_CRYPT, alg_len(x->ealg), x->ealg);
sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
if (x->calg) if (x->calg)
NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
@ -2072,9 +2073,9 @@ static inline int xfrm_sa_len(struct xfrm_state *x)
{ {
int l = 0; int l = 0;
if (x->aalg) if (x->aalg)
l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8); l += RTA_SPACE(alg_len(x->aalg));
if (x->ealg) if (x->ealg)
l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8); l += RTA_SPACE(alg_len(x->ealg));
if (x->calg) if (x->calg)
l += RTA_SPACE(sizeof(*x->calg)); l += RTA_SPACE(sizeof(*x->calg));
if (x->encap) if (x->encap)
@ -2127,11 +2128,9 @@ static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
copy_to_user_state(x, p); copy_to_user_state(x, p);
if (x->aalg) if (x->aalg)
NLA_PUT(skb, XFRMA_ALG_AUTH, NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg);
sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
if (x->ealg) if (x->ealg)
NLA_PUT(skb, XFRMA_ALG_CRYPT, NLA_PUT(skb, XFRMA_ALG_CRYPT, alg_len(x->ealg), x->ealg);
sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
if (x->calg) if (x->calg)
NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);