[XFRM] netlink: Enhance indexing of the attribute array

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>

1 files changed, 39 insertions, 41 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 1371a0ae0606..8c323b187e6a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -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)
@@ -78,7 +78,7 @@ 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);
@@ -86,7 +86,7 @@ static void verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
 
 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)
@@ -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
@@ -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;
@@ -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;
@@ -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)
@@ -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;
@@ -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;
@@ -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);
@@ -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;
@@ -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);
@@ -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();
@@ -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;
 
@@ -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);
@@ -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;