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Diffstat (limited to 'net/sched/cls_api.c')
-rw-r--r--net/sched/cls_api.c190
1 files changed, 113 insertions, 77 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 1ecdf809b5fa..732f7cae459d 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
+#include <linux/err.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/kmod.h>
@@ -38,14 +39,14 @@ static DEFINE_RWLOCK(cls_mod_lock);
/* Find classifier type by string name */
-static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
+static const struct tcf_proto_ops *tcf_proto_lookup_ops(const char *kind)
{
const struct tcf_proto_ops *t, *res = NULL;
if (kind) {
read_lock(&cls_mod_lock);
list_for_each_entry(t, &tcf_proto_base, head) {
- if (nla_strcmp(kind, t->kind) == 0) {
+ if (strcmp(kind, t->kind) == 0) {
if (try_module_get(t->owner))
res = t;
break;
@@ -127,6 +128,77 @@ static inline u32 tcf_auto_prio(struct tcf_proto *tp)
return first;
}
+static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
+ u32 prio, u32 parent, struct Qdisc *q)
+{
+ struct tcf_proto *tp;
+ int err;
+
+ tp = kzalloc(sizeof(*tp), GFP_KERNEL);
+ if (!tp)
+ return ERR_PTR(-ENOBUFS);
+
+ err = -ENOENT;
+ tp->ops = tcf_proto_lookup_ops(kind);
+ if (!tp->ops) {
+#ifdef CONFIG_MODULES
+ rtnl_unlock();
+ request_module("cls_%s", kind);
+ rtnl_lock();
+ tp->ops = tcf_proto_lookup_ops(kind);
+ /* We dropped the RTNL semaphore in order to perform
+ * the module load. So, even if we succeeded in loading
+ * the module we have to replay the request. We indicate
+ * this using -EAGAIN.
+ */
+ if (tp->ops) {
+ module_put(tp->ops->owner);
+ err = -EAGAIN;
+ } else {
+ err = -ENOENT;
+ }
+ goto errout;
+#endif
+ }
+ tp->classify = tp->ops->classify;
+ tp->protocol = protocol;
+ tp->prio = prio;
+ tp->classid = parent;
+ tp->q = q;
+
+ err = tp->ops->init(tp);
+ if (err) {
+ module_put(tp->ops->owner);
+ goto errout;
+ }
+ return tp;
+
+errout:
+ kfree(tp);
+ return ERR_PTR(err);
+}
+
+static bool tcf_proto_destroy(struct tcf_proto *tp, bool force)
+{
+ if (tp->ops->destroy(tp, force)) {
+ module_put(tp->ops->owner);
+ kfree_rcu(tp, rcu);
+ return true;
+ }
+ return false;
+}
+
+void tcf_destroy_chain(struct tcf_proto __rcu **fl)
+{
+ struct tcf_proto *tp;
+
+ while ((tp = rtnl_dereference(*fl)) != NULL) {
+ RCU_INIT_POINTER(*fl, tp->next);
+ tcf_proto_destroy(tp, true);
+ }
+}
+EXPORT_SYMBOL(tcf_destroy_chain);
+
/* Add/change/delete/get a filter node */
static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
@@ -142,8 +214,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
struct Qdisc *q;
struct tcf_proto __rcu **back;
struct tcf_proto __rcu **chain;
+ struct tcf_proto *next;
struct tcf_proto *tp;
- const struct tcf_proto_ops *tp_ops;
const struct Qdisc_class_ops *cops;
unsigned long cl;
unsigned long fh;
@@ -222,9 +294,10 @@ replay:
/* And the last stroke */
chain = cops->tcf_chain(q, cl);
- err = -EINVAL;
- if (chain == NULL)
+ if (chain == NULL) {
+ err = -EINVAL;
goto errout;
+ }
if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER);
tcf_destroy_chain(chain);
@@ -239,10 +312,13 @@ replay:
if (tp->prio >= prio) {
if (tp->prio == prio) {
if (!nprio ||
- (tp->protocol != protocol && protocol))
+ (tp->protocol != protocol && protocol)) {
+ err = -EINVAL;
goto errout;
- } else
+ }
+ } else {
tp = NULL;
+ }
break;
}
}
@@ -250,109 +326,69 @@ replay:
if (tp == NULL) {
/* Proto-tcf does not exist, create new one */
- if (tca[TCA_KIND] == NULL || !protocol)
+ if (tca[TCA_KIND] == NULL || !protocol) {
+ err = -EINVAL;
goto errout;
+ }
- err = -ENOENT;
if (n->nlmsg_type != RTM_NEWTFILTER ||
- !(n->nlmsg_flags & NLM_F_CREATE))
+ !(n->nlmsg_flags & NLM_F_CREATE)) {
+ err = -ENOENT;
goto errout;
+ }
+ if (!nprio)
+ nprio = TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
- /* Create new proto tcf */
-
- err = -ENOBUFS;
- tp = kzalloc(sizeof(*tp), GFP_KERNEL);
- if (tp == NULL)
- goto errout;
- err = -ENOENT;
- tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
- if (tp_ops == NULL) {
-#ifdef CONFIG_MODULES
- struct nlattr *kind = tca[TCA_KIND];
- char name[IFNAMSIZ];
-
- if (kind != NULL &&
- nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
- rtnl_unlock();
- request_module("cls_%s", name);
- rtnl_lock();
- tp_ops = tcf_proto_lookup_ops(kind);
- /* We dropped the RTNL semaphore in order to
- * perform the module load. So, even if we
- * succeeded in loading the module we have to
- * replay the request. We indicate this using
- * -EAGAIN.
- */
- if (tp_ops != NULL) {
- module_put(tp_ops->owner);
- err = -EAGAIN;
- }
- }
-#endif
- kfree(tp);
- goto errout;
- }
- tp->ops = tp_ops;
- tp->protocol = protocol;
- tp->prio = nprio ? :
- TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
- tp->q = q;
- tp->classify = tp_ops->classify;
- tp->classid = parent;
-
- err = tp_ops->init(tp);
- if (err != 0) {
- module_put(tp_ops->owner);
- kfree(tp);
+ tp = tcf_proto_create(nla_data(tca[TCA_KIND]),
+ protocol, nprio, parent, q);
+ if (IS_ERR(tp)) {
+ err = PTR_ERR(tp);
goto errout;
}
-
tp_created = 1;
-
- } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
+ } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind)) {
+ err = -EINVAL;
goto errout;
+ }
fh = tp->ops->get(tp, t->tcm_handle);
if (fh == 0) {
if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
- struct tcf_proto *next = rtnl_dereference(tp->next);
-
+ next = rtnl_dereference(tp->next);
RCU_INIT_POINTER(*back, next);
-
tfilter_notify(net, skb, n, tp, fh,
RTM_DELTFILTER, false);
- tcf_destroy(tp, true);
+ tcf_proto_destroy(tp, true);
err = 0;
goto errout;
}
- err = -ENOENT;
if (n->nlmsg_type != RTM_NEWTFILTER ||
- !(n->nlmsg_flags & NLM_F_CREATE))
+ !(n->nlmsg_flags & NLM_F_CREATE)) {
+ err = -ENOENT;
goto errout;
+ }
} else {
switch (n->nlmsg_type) {
case RTM_NEWTFILTER:
- err = -EEXIST;
if (n->nlmsg_flags & NLM_F_EXCL) {
if (tp_created)
- tcf_destroy(tp, true);
+ tcf_proto_destroy(tp, true);
+ err = -EEXIST;
goto errout;
}
break;
case RTM_DELTFILTER:
err = tp->ops->delete(tp, fh);
- if (err == 0) {
- struct tcf_proto *next = rtnl_dereference(tp->next);
-
- tfilter_notify(net, skb, n, tp,
- t->tcm_handle,
- RTM_DELTFILTER, false);
- if (tcf_destroy(tp, false))
- RCU_INIT_POINTER(*back, next);
- }
+ if (err)
+ goto errout;
+ next = rtnl_dereference(tp->next);
+ tfilter_notify(net, skb, n, tp, t->tcm_handle,
+ RTM_DELTFILTER, false);
+ if (tcf_proto_destroy(tp, false))
+ RCU_INIT_POINTER(*back, next);
goto errout;
case RTM_GETTFILTER:
err = tfilter_notify(net, skb, n, tp, fh,
@@ -374,7 +410,7 @@ replay:
tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false);
} else {
if (tp_created)
- tcf_destroy(tp, true);
+ tcf_proto_destroy(tp, true);
}
errout:
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 20:10:54 +0000