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[XFRM] netlink: Enhance indexing of the attribute array
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nlmsg_parse() puts attributes at array[type] so the indexing
method can be simpilfied by removing the obscuring "- 1".

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Thomas Graf authored and David S. Miller committed Oct 10, 2007
1 parent cf5cb79 commit fab4489
Showing 1 changed file with 39 additions and 41 deletions.
80 changes: 39 additions & 41 deletions net/xfrm/xfrm_user.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ static inline int alg_len(struct xfrm_algo *alg)

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];
struct xfrm_algo *algp;

if (!rt)
Expand Down Expand Up @@ -78,15 +78,15 @@ static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
static void verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
xfrm_address_t **addrp)
{
struct rtattr *rt = xfrma[type - 1];
struct rtattr *rt = xfrma[type];

if (rt && addrp)
*addrp = RTA_DATA(rt);
}

static inline int verify_sec_ctx_len(struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
struct rtattr *rt = xfrma[XFRMA_SEC_CTX];
struct xfrm_user_sec_ctx *uctx;

if (!rt)
Expand Down Expand Up @@ -125,35 +125,35 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
err = -EINVAL;
switch (p->id.proto) {
case IPPROTO_AH:
if (!xfrma[XFRMA_ALG_AUTH-1] ||
xfrma[XFRMA_ALG_CRYPT-1] ||
xfrma[XFRMA_ALG_COMP-1])
if (!xfrma[XFRMA_ALG_AUTH] ||
xfrma[XFRMA_ALG_CRYPT] ||
xfrma[XFRMA_ALG_COMP])
goto out;
break;

case IPPROTO_ESP:
if ((!xfrma[XFRMA_ALG_AUTH-1] &&
!xfrma[XFRMA_ALG_CRYPT-1]) ||
xfrma[XFRMA_ALG_COMP-1])
if ((!xfrma[XFRMA_ALG_AUTH] &&
!xfrma[XFRMA_ALG_CRYPT]) ||
xfrma[XFRMA_ALG_COMP])
goto out;
break;

case IPPROTO_COMP:
if (!xfrma[XFRMA_ALG_COMP-1] ||
xfrma[XFRMA_ALG_AUTH-1] ||
xfrma[XFRMA_ALG_CRYPT-1])
if (!xfrma[XFRMA_ALG_COMP] ||
xfrma[XFRMA_ALG_AUTH] ||
xfrma[XFRMA_ALG_CRYPT])
goto out;
break;

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
if (xfrma[XFRMA_ALG_COMP-1] ||
xfrma[XFRMA_ALG_AUTH-1] ||
xfrma[XFRMA_ALG_CRYPT-1] ||
xfrma[XFRMA_ENCAP-1] ||
xfrma[XFRMA_SEC_CTX-1] ||
!xfrma[XFRMA_COADDR-1])
if (xfrma[XFRMA_ALG_COMP] ||
xfrma[XFRMA_ALG_AUTH] ||
xfrma[XFRMA_ALG_CRYPT] ||
xfrma[XFRMA_ENCAP] ||
xfrma[XFRMA_SEC_CTX] ||
!xfrma[XFRMA_COADDR])
goto out;
break;
#endif
Expand Down Expand Up @@ -300,10 +300,10 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
*/
static void xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
{
struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL];
struct rtattr *lt = xfrma[XFRMA_LTIME_VAL];
struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH];
struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH];

if (rp) {
struct xfrm_replay_state *replay;
Expand Down Expand Up @@ -342,25 +342,25 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,

if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
xfrm_aalg_get_byname,
xfrma[XFRMA_ALG_AUTH-1])))
xfrma[XFRMA_ALG_AUTH])))
goto error;
if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
xfrm_ealg_get_byname,
xfrma[XFRMA_ALG_CRYPT-1])))
xfrma[XFRMA_ALG_CRYPT])))
goto error;
if ((err = attach_one_algo(&x->calg, &x->props.calgo,
xfrm_calg_get_byname,
xfrma[XFRMA_ALG_COMP-1])))
xfrma[XFRMA_ALG_COMP])))
goto error;
if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP])))
goto error;
if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR])))
goto error;
err = xfrm_init_state(x);
if (err)
goto error;

if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX])))
goto error;

x->km.seq = p->seq;
Expand Down Expand Up @@ -917,7 +917,7 @@ static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)

static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
struct rtattr *rt = xfrma[XFRMA_SEC_CTX];
struct xfrm_user_sec_ctx *uctx;

if (!rt)
Expand Down Expand Up @@ -985,7 +985,7 @@ static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)

static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_TMPL-1];
struct rtattr *rt = xfrma[XFRMA_TMPL];

if (!rt) {
pol->xfrm_nr = 0;
Expand All @@ -1005,7 +1005,7 @@ static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)

static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE];
struct xfrm_userpolicy_type *upt;
u8 type = XFRM_POLICY_TYPE_MAIN;
int err;
Expand Down Expand Up @@ -1294,7 +1294,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
if (p->index)
xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
else {
struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
struct rtattr *rt = xfrma[XFRMA_SEC_CTX];
struct xfrm_policy tmp;

err = verify_sec_ctx_len(xfrma);
Expand Down Expand Up @@ -1455,8 +1455,8 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
struct km_event c;
int err = - EINVAL;
struct xfrm_aevent_id *p = nlmsg_data(nlh);
struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL];
struct rtattr *lt = xfrma[XFRMA_LTIME_VAL];

if (!lt && !rp)
return err;
Expand Down Expand Up @@ -1528,7 +1528,7 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
if (p->index)
xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
else {
struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
struct rtattr *rt = xfrma[XFRMA_SEC_CTX];
struct xfrm_policy tmp;

err = verify_sec_ctx_len(xfrma);
Expand Down Expand Up @@ -1611,7 +1611,7 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
struct xfrm_policy *xp;
struct xfrm_user_tmpl *ut;
int i;
struct rtattr *rt = xfrma[XFRMA_TMPL-1];
struct rtattr *rt = xfrma[XFRMA_TMPL];

struct xfrm_user_acquire *ua = nlmsg_data(nlh);
struct xfrm_state *x = xfrm_state_alloc();
Expand Down Expand Up @@ -1663,7 +1663,7 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
static int copy_from_user_migrate(struct xfrm_migrate *ma,
struct rtattr **xfrma, int *num)
{
struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
struct rtattr *rt = xfrma[XFRMA_MIGRATE];
struct xfrm_user_migrate *um;
int i, num_migrate;

Expand Down Expand Up @@ -1700,7 +1700,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
int err;
int n = 0;

if (xfrma[XFRMA_MIGRATE-1] == NULL)
if (xfrma[XFRMA_MIGRATE] == NULL)
return -EINVAL;

err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
Expand Down Expand Up @@ -1906,9 +1906,7 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
}

/* FIXME: Temporary hack, nlmsg_parse() starts at xfrma[1], old code
* expects first attribute at xfrma[0] */
err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma-1, XFRMA_MAX,
err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma, XFRMA_MAX,
xfrma_policy);
if (err < 0)
return err;
Expand Down

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