Merge tag 'v4.15-rc1' into next-seccomp

Linux 4.15-rc1

1 files changed, 73 insertions, 47 deletions

diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index c4fd63a068f9..5f169ded347e 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -17,13 +17,14 @@
 #include <linux/errno.h>
 #include <linux/rtnetlink.h>
 #include <linux/skbuff.h>
+#include <linux/idr.h>
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
 
 struct basic_head {
-	u32			hgenerator;
 	struct list_head	flist;
+	struct idr		handle_idr;
 	struct rcu_head		rcu;
 };
 
@@ -34,7 +35,10 @@ struct basic_filter {
 	struct tcf_result	res;
 	struct tcf_proto	*tp;
 	struct list_head	link;
-	struct rcu_head		rcu;
+	union {
+		struct work_struct	work;
+		struct rcu_head		rcu;
+	};
 };
 
 static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
@@ -56,20 +60,18 @@ static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 	return -1;
 }
 
-static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
+static void *basic_get(struct tcf_proto *tp, u32 handle)
 {
-	unsigned long l = 0UL;
 	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f;
 
 	list_for_each_entry(f, &head->flist, link) {
 		if (f->handle == handle) {
-			l = (unsigned long) f;
-			break;
+			return f;
 		}
 	}
 
-	return l;
+	return NULL;
 }
 
 static int basic_init(struct tcf_proto *tp)
@@ -80,19 +82,36 @@ static int basic_init(struct tcf_proto *tp)
 	if (head == NULL)
 		return -ENOBUFS;
 	INIT_LIST_HEAD(&head->flist);
+	idr_init(&head->handle_idr);
 	rcu_assign_pointer(tp->root, head);
 	return 0;
 }
 
-static void basic_delete_filter(struct rcu_head *head)
+static void __basic_delete_filter(struct basic_filter *f)
 {
-	struct basic_filter *f = container_of(head, struct basic_filter, rcu);
-
 	tcf_exts_destroy(&f->exts);
 	tcf_em_tree_destroy(&f->ematches);
+	tcf_exts_put_net(&f->exts);
 	kfree(f);
 }
 
+static void basic_delete_filter_work(struct work_struct *work)
+{
+	struct basic_filter *f = container_of(work, struct basic_filter, work);
+
+	rtnl_lock();
+	__basic_delete_filter(f);
+	rtnl_unlock();
+}
+
+static void basic_delete_filter(struct rcu_head *head)
+{
+	struct basic_filter *f = container_of(head, struct basic_filter, rcu);
+
+	INIT_WORK(&f->work, basic_delete_filter_work);
+	tcf_queue_work(&f->work);
+}
+
 static void basic_destroy(struct tcf_proto *tp)
 {
 	struct basic_head *head = rtnl_dereference(tp->root);
@@ -101,18 +120,25 @@ static void basic_destroy(struct tcf_proto *tp)
 	list_for_each_entry_safe(f, n, &head->flist, link) {
 		list_del_rcu(&f->link);
 		tcf_unbind_filter(tp, &f->res);
-		call_rcu(&f->rcu, basic_delete_filter);
+		idr_remove_ext(&head->handle_idr, f->handle);
+		if (tcf_exts_get_net(&f->exts))
+			call_rcu(&f->rcu, basic_delete_filter);
+		else
+			__basic_delete_filter(f);
 	}
+	idr_destroy(&head->handle_idr);
 	kfree_rcu(head, rcu);
 }
 
-static int basic_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
+static int basic_delete(struct tcf_proto *tp, void *arg, bool *last)
 {
 	struct basic_head *head = rtnl_dereference(tp->root);
-	struct basic_filter *f = (struct basic_filter *) arg;
+	struct basic_filter *f = arg;
 
 	list_del_rcu(&f->link);
 	tcf_unbind_filter(tp, &f->res);
+	idr_remove_ext(&head->handle_idr, f->handle);
+	tcf_exts_get_net(&f->exts);
 	call_rcu(&f->rcu, basic_delete_filter);
 	*last = list_empty(&head->flist);
 	return 0;
@@ -129,44 +155,34 @@ static int basic_set_parms(struct net *net, struct tcf_proto *tp,
 			   struct nlattr *est, bool ovr)
 {
 	int err;
-	struct tcf_exts e;
-	struct tcf_ematch_tree t;
 
-	err = tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
 	if (err < 0)
 		return err;
-	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
-	if (err < 0)
-		goto errout;
 
-	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t);
+	err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
 	if (err < 0)
-		goto errout;
+		return err;
 
 	if (tb[TCA_BASIC_CLASSID]) {
 		f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
 		tcf_bind_filter(tp, &f->res, base);
 	}
 
-	tcf_exts_change(tp, &f->exts, &e);
-	tcf_em_tree_change(tp, &f->ematches, &t);
 	f->tp = tp;
-
 	return 0;
-errout:
-	tcf_exts_destroy(&e);
-	return err;
 }
 
 static int basic_change(struct net *net, struct sk_buff *in_skb,
 			struct tcf_proto *tp, unsigned long base, u32 handle,
-			struct nlattr **tca, unsigned long *arg, bool ovr)
+			struct nlattr **tca, void **arg, bool ovr)
 {
 	int err;
 	struct basic_head *head = rtnl_dereference(tp->root);
 	struct nlattr *tb[TCA_BASIC_MAX + 1];
 	struct basic_filter *fold = (struct basic_filter *) *arg;
 	struct basic_filter *fnew;
+	unsigned long idr_index;
 
 	if (tca[TCA_OPTIONS] == NULL)
 		return -EINVAL;
@@ -189,35 +205,36 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
 	if (err < 0)
 		goto errout;
 
-	err = -EINVAL;
 	if (handle) {
 		fnew->handle = handle;
-	} else if (fold) {
-		fnew->handle = fold->handle;
+		if (!fold) {
+			err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
+					    handle, handle + 1, GFP_KERNEL);
+			if (err)
+				goto errout;
+		}
 	} else {
-		unsigned int i = 0x80000000;
-		do {
-			if (++head->hgenerator == 0x7FFFFFFF)
-				head->hgenerator = 1;
-		} while (--i > 0 && basic_get(tp, head->hgenerator));
-
-		if (i <= 0) {
-			pr_err("Insufficient number of handles\n");
+		err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
+				    1, 0x7FFFFFFF, GFP_KERNEL);
+		if (err)
 			goto errout;
-		}
-
-		fnew->handle = head->hgenerator;
+		fnew->handle = idr_index;
 	}
 
 	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
-	if (err < 0)
+	if (err < 0) {
+		if (!fold)
+			idr_remove_ext(&head->handle_idr, fnew->handle);
 		goto errout;
+	}
 
-	*arg = (unsigned long)fnew;
+	*arg = fnew;
 
 	if (fold) {
+		idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
 		list_replace_rcu(&fold->link, &fnew->link);
 		tcf_unbind_filter(tp, &fold->res);
+		tcf_exts_get_net(&fold->exts);
 		call_rcu(&fold->rcu, basic_delete_filter);
 	} else {
 		list_add_rcu(&fnew->link, &head->flist);
@@ -239,7 +256,7 @@ static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 		if (arg->count < arg->skip)
 			goto skip;
 
-		if (arg->fn(tp, (unsigned long) f, arg) < 0) {
+		if (arg->fn(tp, f, arg) < 0) {
 			arg->stop = 1;
 			break;
 		}
@@ -248,10 +265,18 @@ skip:
 	}
 }
 
-static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
+static void basic_bind_class(void *fh, u32 classid, unsigned long cl)
+{
+	struct basic_filter *f = fh;
+
+	if (f && f->res.classid == classid)
+		f->res.class = cl;
+}
+
+static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,
 		      struct sk_buff *skb, struct tcmsg *t)
 {
-	struct basic_filter *f = (struct basic_filter *) fh;
+	struct basic_filter *f = fh;
 	struct nlattr *nest;
 
 	if (f == NULL)
@@ -293,6 +318,7 @@ static struct tcf_proto_ops cls_basic_ops __read_mostly = {
 	.delete		=	basic_delete,
 	.walk		=	basic_walk,
 	.dump		=	basic_dump,
+	.bind_class	=	basic_bind_class,
 	.owner		=	THIS_MODULE,
 };