[NET_SCHED]: Use nla_nest_start/nla_nest_end

[linux-2.6-block.git] / net / sched / act_api.c

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index ea80f82dbb6a5c4b2e21fdc07ee42e1fcd645a9f..36022605fc162b1442b20f30c5aef78cd00aeaca 100644 (file)
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -69,7 +69,7 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
 {
        struct tcf_common *p;
        int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
-       struct nlattr *r ;
+       struct nlattr *nest;
 
        read_lock_bh(hinfo->lock);
 
@@ -84,15 +84,17 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
                                continue;
                        a->priv = p;
                        a->order = n_i;
-                       r = (struct nlattr *)skb_tail_pointer(skb);
-                       NLA_PUT(skb, a->order, 0, NULL);
+
+                       nest = nla_nest_start(skb, a->order);
+                       if (nest == NULL)
+                               goto nla_put_failure;
                        err = tcf_action_dump_1(skb, a, 0, 0);
                        if (err < 0) {
                                index--;
-                               nlmsg_trim(skb, r);
+                               nlmsg_trim(skb, nest);
                                goto done;
                        }
-                       r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
+                       nla_nest_end(skb, nest);
                        n_i++;
                        if (n_i >= TCA_ACT_MAX_PRIO)
                                goto done;
@@ -105,7 +107,7 @@ done:
        return n_i;
 
 nla_put_failure:
-       nlmsg_trim(skb, r);
+       nla_nest_cancel(skb, nest);
        goto done;
 }
 
@@ -113,11 +115,12 @@ static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
                          struct tcf_hashinfo *hinfo)
 {
        struct tcf_common *p, *s_p;
-       struct nlattr *r ;
+       struct nlattr *nest;
        int i= 0, n_i = 0;
 
-       r = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, a->order, 0, NULL);
+       nest = nla_nest_start(skb, a->order);
+       if (nest == NULL)
+               goto nla_put_failure;
        NLA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
        for (i = 0; i < (hinfo->hmask + 1); i++) {
                p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
@@ -131,11 +134,11 @@ static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
                }
        }
        NLA_PUT(skb, TCA_FCNT, 4, &n_i);
-       r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
+       nla_nest_end(skb, nest);
 
        return n_i;
 nla_put_failure:
-       nlmsg_trim(skb, r);
+       nla_nest_cancel(skb, nest);
        return -EINVAL;
 }
 
@@ -415,7 +418,7 @@ tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
 {
        int err = -EINVAL;
        unsigned char *b = skb_tail_pointer(skb);
-       struct nlattr *r;
+       struct nlattr *nest;
 
        if (a->ops == NULL || a->ops->dump == NULL)
                return err;
@@ -423,10 +426,11 @@ tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
        NLA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
        if (tcf_action_copy_stats(skb, a, 0))
                goto nla_put_failure;
-       r = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, TCA_OPTIONS, 0, NULL);
+       nest = nla_nest_start(skb, TCA_OPTIONS);
+       if (nest == NULL)
+               goto nla_put_failure;
        if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) {
-               r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
+               nla_nest_end(skb, nest);
                return err;
        }
 
@@ -441,17 +445,17 @@ tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
 {
        struct tc_action *a;
        int err = -EINVAL;
-       unsigned char *b = skb_tail_pointer(skb);
-       struct nlattr *r ;
+       struct nlattr *nest;
 
        while ((a = act) != NULL) {
-               r = (struct nlattr *)skb_tail_pointer(skb);
                act = a->next;
-               NLA_PUT(skb, a->order, 0, NULL);
+               nest = nla_nest_start(skb, a->order);
+               if (nest == NULL)
+                       goto nla_put_failure;
                err = tcf_action_dump_1(skb, a, bind, ref);
                if (err < 0)
                        goto errout;
-               r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
+               nla_nest_end(skb, nest);
        }
 
        return 0;
@@ -459,7 +463,7 @@ tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
 nla_put_failure:
        err = -EINVAL;
 errout:
-       nlmsg_trim(skb, b);
+       nla_nest_cancel(skb, nest);
        return err;
 }
 
@@ -473,17 +477,18 @@ struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
        struct nlattr *kind;
        int err;
 
-       err = -EINVAL;
-
        if (name == NULL) {
-               if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
+               err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+               if (err < 0)
                        goto err_out;
+               err = -EINVAL;
                kind = tb[TCA_ACT_KIND];
                if (kind == NULL)
                        goto err_out;
                if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ)
                        goto err_out;
        } else {
+               err = -EINVAL;
                if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ)
                        goto err_out;
        }
@@ -548,10 +553,12 @@ struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
 {
        struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
        struct tc_action *head = NULL, *act, *act_prev = NULL;
+       int err;
        int i;
 
-       if (nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL) < 0)
-               return ERR_PTR(-EINVAL);
+       err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
+       if (err < 0)
+               return ERR_PTR(err);
 
        for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
                act = tcf_action_init_1(tb[i], est, name, ovr, bind);
@@ -624,7 +631,7 @@ tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
        struct tcamsg *t;
        struct nlmsghdr *nlh;
        unsigned char *b = skb_tail_pointer(skb);
-       struct nlattr *x;
+       struct nlattr *nest;
 
        nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags);
 
@@ -633,13 +640,14 @@ tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq,
        t->tca__pad1 = 0;
        t->tca__pad2 = 0;
 
-       x = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, TCA_ACT_TAB, 0, NULL);
+       nest = nla_nest_start(skb, TCA_ACT_TAB);
+       if (nest == NULL)
+               goto nla_put_failure;
 
        if (tcf_action_dump(skb, a, bind, ref) < 0)
                goto nla_put_failure;
 
-       x->nla_len = skb_tail_pointer(skb) - (u8 *)x;
+       nla_nest_end(skb, nest);
 
        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
        return skb->len;
@@ -674,10 +682,11 @@ tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
        int index;
        int err;
 
-       err = -EINVAL;
-       if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
+       err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+       if (err < 0)
                goto err_out;
 
+       err = -EINVAL;
        if (tb[TCA_ACT_INDEX] == NULL ||
            nla_len(tb[TCA_ACT_INDEX]) < sizeof(index))
                goto err_out;
@@ -739,7 +748,7 @@ static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
        struct nlmsghdr *nlh;
        struct tcamsg *t;
        struct netlink_callback dcb;
-       struct nlattr *x;
+       struct nlattr *nest;
        struct nlattr *tb[TCA_ACT_MAX+1];
        struct nlattr *kind;
        struct tc_action *a = create_a(0);
@@ -759,9 +768,11 @@ static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
 
        b = skb_tail_pointer(skb);
 
-       if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
+       err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL);
+       if (err < 0)
                goto err_out;
 
+       err = -EINVAL;
        kind = tb[TCA_ACT_KIND];
        a->ops = tc_lookup_action(kind);
        if (a->ops == NULL)
@@ -773,14 +784,15 @@ static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
        t->tca__pad1 = 0;
        t->tca__pad2 = 0;
 
-       x = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, TCA_ACT_TAB, 0, NULL);
+       nest = nla_nest_start(skb, TCA_ACT_TAB);
+       if (nest == NULL)
+               goto nla_put_failure;
 
        err = a->ops->walk(skb, &dcb, RTM_DELACTION, a);
        if (err < 0)
                goto nla_put_failure;
 
-       x->nla_len = skb_tail_pointer(skb) - (u8 *)x;
+       nla_nest_end(skb, nest);
 
        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
        nlh->nlmsg_flags |= NLM_F_ROOT;
@@ -804,12 +816,13 @@ err_out:
 static int
 tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
 {
-       int i, ret = 0;
+       int i, ret;
        struct nlattr *tb[TCA_ACT_MAX_PRIO+1];
        struct tc_action *head = NULL, *act, *act_prev = NULL;
 
-       if (nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL) < 0)
-               return -EINVAL;
+       ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
+       if (ret < 0)
+               return ret;
 
        if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) {
                if (tb[0] != NULL && tb[1] == NULL)
@@ -868,7 +881,7 @@ static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
        struct tcamsg *t;
        struct nlmsghdr *nlh;
        struct sk_buff *skb;
-       struct nlattr *x;
+       struct nlattr *nest;
        unsigned char *b;
        int err = 0;
 
@@ -884,13 +897,14 @@ static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event,
        t->tca__pad1 = 0;
        t->tca__pad2 = 0;
 
-       x = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, TCA_ACT_TAB, 0, NULL);
+       nest = nla_nest_start(skb, TCA_ACT_TAB);
+       if (nest == NULL)
+               goto nla_put_failure;
 
        if (tcf_action_dump(skb, a, 0, 0) < 0)
                goto nla_put_failure;
 
-       x->nla_len = skb_tail_pointer(skb) - (u8 *)x;
+       nla_nest_end(skb, nest);
 
        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
        NETLINK_CB(skb).dst_group = RTNLGRP_TC;
@@ -1018,7 +1032,7 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
        struct net *net = skb->sk->sk_net;
        struct nlmsghdr *nlh;
        unsigned char *b = skb_tail_pointer(skb);
-       struct nlattr *x;
+       struct nlattr *nest;
        struct tc_action_ops *a_o;
        struct tc_action a;
        int ret = 0;
@@ -1053,18 +1067,19 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
        t->tca__pad1 = 0;
        t->tca__pad2 = 0;
 
-       x = (struct nlattr *)skb_tail_pointer(skb);
-       NLA_PUT(skb, TCA_ACT_TAB, 0, NULL);
+       nest = nla_nest_start(skb, TCA_ACT_TAB);
+       if (nest == NULL)
+               goto nla_put_failure;
 
        ret = a_o->walk(skb, cb, RTM_GETACTION, &a);
        if (ret < 0)
                goto nla_put_failure;
 
        if (ret > 0) {
-               x->nla_len = skb_tail_pointer(skb) - (u8 *)x;
+               nla_nest_end(skb, nest);
                ret = skb->len;
        } else
-               nlmsg_trim(skb, x);
+               nla_nest_cancel(skb, nest);
 
        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
        if (NETLINK_CB(cb->skb).pid && ret)