X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fsched%2Fact_api.c;h=d308c19aa3f9be6d6087aecfa27dcc55dead6eed;hb=f8e79ddd31c3615ddca26b9a469c44a7adbd4e13;hp=ae077ed208af79306e3a4d6a4e74ba8cf2caf2e9;hpb=6d834e04e596d6803cf1074a07fd67e7b5662f1b;p=linux-2.6

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index ae077ed208..d308c19aa3 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -18,6 +18,7 @@
 #include <linux/skbuff.h>
 #include <linux/init.h>
 #include <linux/kmod.h>
+#include <linux/err.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/sch_generic.h>
@@ -40,7 +41,7 @@ void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo)
 			return;
 		}
 	}
-	BUG_TRAP(0);
+	WARN_ON(1);
 }
 EXPORT_SYMBOL(tcf_hash_destroy);
 
@@ -68,7 +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);
 
@@ -83,15 +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;
@@ -104,7 +107,7 @@ done:
 	return n_i;
 
 nla_put_failure:
-	nlmsg_trim(skb, r);
+	nla_nest_cancel(skb, nest);
 	goto done;
 }
 
@@ -112,12 +115,13 @@ 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);
-	NLA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
+	nest = nla_nest_start(skb, a->order);
+	if (nest == NULL)
+		goto nla_put_failure;
+	NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind);
 	for (i = 0; i < (hinfo->hmask + 1); i++) {
 		p = hinfo->htab[tcf_hash(i, hinfo->hmask)];
 
@@ -129,12 +133,12 @@ static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a,
 			p = s_p;
 		}
 	}
-	NLA_PUT(skb, TCA_FCNT, 4, &n_i);
-	r->nla_len = skb_tail_pointer(skb) - (u8 *)r;
+	NLA_PUT_U32(skb, TCA_FCNT, n_i);
+	nla_nest_end(skb, nest);
 
 	return n_i;
 nla_put_failure:
-	nlmsg_trim(skb, r);
+	nla_nest_cancel(skb, nest);
 	return -EINVAL;
 }
 
@@ -414,18 +418,19 @@ 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;
 
-	NLA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind);
+	NLA_PUT_STRING(skb, TCA_KIND, 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;
 	}
 
@@ -440,17 +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;
@@ -458,30 +463,32 @@ 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;
 }
 
 struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
-				    char *name, int ovr, int bind, int *err)
+				    char *name, int ovr, int bind)
 {
 	struct tc_action *a;
 	struct tc_action_ops *a_o;
 	char act_name[IFNAMSIZ];
 	struct nlattr *tb[TCA_ACT_MAX+1];
 	struct nlattr *kind;
-
-	*err = -EINVAL;
+	int err;
 
 	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;
 	}
@@ -502,36 +509,35 @@ struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est,
 		 * indicate this using -EAGAIN.
 		 */
 		if (a_o != NULL) {
-			*err = -EAGAIN;
+			err = -EAGAIN;
 			goto err_mod;
 		}
 #endif
-		*err = -ENOENT;
+		err = -ENOENT;
 		goto err_out;
 	}
 
-	*err = -ENOMEM;
+	err = -ENOMEM;
 	a = kzalloc(sizeof(*a), GFP_KERNEL);
 	if (a == NULL)
 		goto err_mod;
 
 	/* backward compatibility for policer */
 	if (name == NULL)
-		*err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
+		err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
 	else
-		*err = a_o->init(nla, est, a, ovr, bind);
-	if (*err < 0)
+		err = a_o->init(nla, est, a, ovr, bind);
+	if (err < 0)
 		goto err_free;
 
 	/* module count goes up only when brand new policy is created
 	   if it exists and is only bound to in a_o->init() then
 	   ACT_P_CREATED is not returned (a zero is).
 	*/
-	if (*err != ACT_P_CREATED)
+	if (err != ACT_P_CREATED)
 		module_put(a_o->owner);
 	a->ops = a_o;
 
-	*err = 0;
 	return a;
 
 err_free:
@@ -539,24 +545,24 @@ err_free:
 err_mod:
 	module_put(a_o->owner);
 err_out:
-	return NULL;
+	return ERR_PTR(err);
 }
 
 struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
-				  char *name, int ovr, int bind, int *err)
+				  char *name, int ovr, int bind)
 {
 	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) {
-		*err = -EINVAL;
-		return head;
-	}
+	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, err);
-		if (act == NULL)
+		act = tcf_action_init_1(tb[i], est, name, ovr, bind);
+		if (IS_ERR(act))
 			goto err;
 		act->order = i;
 
@@ -571,7 +577,7 @@ struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est,
 err:
 	if (head != NULL)
 		tcf_action_destroy(head, bind);
-	return NULL;
+	return act;
 }
 
 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
@@ -625,7 +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);
 
@@ -634,13 +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;
@@ -668,44 +675,47 @@ act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event)
 }
 
 static struct tc_action *
-tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int *err)
+tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid)
 {
 	struct nlattr *tb[TCA_ACT_MAX+1];
 	struct tc_action *a;
 	int index;
+	int err;
 
-	*err = -EINVAL;
-	if (nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL) < 0)
-		return NULL;
+	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))
-		return NULL;
-	index = *(int *)nla_data(tb[TCA_ACT_INDEX]);
+		goto err_out;
+	index = nla_get_u32(tb[TCA_ACT_INDEX]);
 
-	*err = -ENOMEM;
+	err = -ENOMEM;
 	a = kzalloc(sizeof(struct tc_action), GFP_KERNEL);
 	if (a == NULL)
-		return NULL;
+		goto err_out;
 
-	*err = -EINVAL;
+	err = -EINVAL;
 	a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
 	if (a->ops == NULL)
 		goto err_free;
 	if (a->ops->lookup == NULL)
 		goto err_mod;
-	*err = -ENOENT;
+	err = -ENOENT;
 	if (a->ops->lookup(a, index) == 0)
 		goto err_mod;
 
 	module_put(a->ops->owner);
-	*err = 0;
 	return a;
+
 err_mod:
 	module_put(a->ops->owner);
 err_free:
 	kfree(a);
-	return NULL;
+err_out:
+	return ERR_PTR(err);
 }
 
 static void cleanup_a(struct tc_action *act)
@@ -738,7 +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);
@@ -758,9 +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)
@@ -772,14 +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;
@@ -803,12 +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)
@@ -816,9 +830,11 @@ tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event)
 	}
 
 	for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
-		act = tcf_action_get_1(tb[i], n, pid, &ret);
-		if (act == NULL)
+		act = tcf_action_get_1(tb[i], n, pid);
+		if (IS_ERR(act)) {
+			ret = PTR_ERR(act);
 			goto err;
+		}
 		act->order = i;
 
 		if (head == NULL)
@@ -865,7 +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;
 
@@ -881,13 +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;
@@ -912,9 +929,13 @@ tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr)
 	struct tc_action *a;
 	u32 seq = n->nlmsg_seq;
 
-	act = tcf_action_init(nla, NULL, NULL, ovr, 0, &ret);
+	act = tcf_action_init(nla, NULL, NULL, ovr, 0);
 	if (act == NULL)
 		goto done;
+	if (IS_ERR(act)) {
+		ret = PTR_ERR(act);
+		goto done;
+	}
 
 	/* dump then free all the actions after update; inserted policy
 	 * stays intact
@@ -930,7 +951,7 @@ done:
 
 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 {
-	struct net *net = skb->sk->sk_net;
+	struct net *net = sock_net(skb->sk);
 	struct nlattr *tca[TCA_ACT_MAX + 1];
 	u32 pid = skb ? NETLINK_CB(skb).pid : 0;
 	int ret = 0, ovr = 0;
@@ -984,11 +1005,8 @@ find_dump_kind(struct nlmsghdr *n)
 	struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
 	struct nlattr *nla[TCAA_MAX + 1];
 	struct nlattr *kind;
-	int min_len = NLMSG_LENGTH(sizeof(struct tcamsg));
-	int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len);
-	struct nlattr *attr = (void *) n + NLMSG_ALIGN(min_len);
 
-	if (nla_parse(nla, TCAA_MAX, attr, attrlen, NULL) < 0)
+	if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0)
 		return NULL;
 	tb1 = nla[TCA_ACT_TAB];
 	if (tb1 == NULL)
@@ -1011,10 +1029,10 @@ find_dump_kind(struct nlmsghdr *n)
 static int
 tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
 {
-	struct net *net = skb->sk->sk_net;
+	struct net *net = sock_net(skb->sk);
 	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;
@@ -1049,18 +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)