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authorPatrick McHardy <kaber@trash.net>2009-09-04 10:41:16 +0400
committerDavid S. Miller <davem@davemloft.net>2009-09-06 13:07:02 +0400
commitde6d5cdf881353f83006d5f3e28ac4fffd42145e (patch)
treeedc032e4d0a868578780facdd28fb0ee277aadc3 /net/sched
parent71ebe5e91947392bc276af713827eab12b6db8e4 (diff)
downloadlinux-de6d5cdf881353f83006d5f3e28ac4fffd42145e.tar.xz
net_sched: make cls_ops->change and cls_ops->delete optional
Some schedulers don't support creating, changing or deleting classes. Make the respective callbacks optionally and consistently return -EOPNOTSUPP for unsupported operations, instead of currently either -EOPNOTSUPP, -ENOSYS or no error. In case of sch_prio and sch_multiq, the removed operations additionally checked for an invalid class. This is not necessary since the class argument can only orginate from ->get() or in case of ->change is 0 for creation of new classes, in which case ->change() incorrectly returned -ENOENT. As a side-effect, this patch fixes a possible (root-only) NULL pointer function call in sch_ingress, which didn't implement a so far mandatory ->delete() operation. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_api.c8
-rw-r--r--net/sched/sch_ingress.c7
-rw-r--r--net/sched/sch_multiq.c22
-rw-r--r--net/sched/sch_prio.c21
-rw-r--r--net/sched/sch_red.c13
-rw-r--r--net/sched/sch_sfq.c7
-rw-r--r--net/sched/sch_tbf.c13
7 files changed, 6 insertions, 85 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index bef2d645a366..166fcca86e7a 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1417,7 +1417,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
goto out;
break;
case RTM_DELTCLASS:
- err = cops->delete(q, cl);
+ err = -EOPNOTSUPP;
+ if (cops->delete)
+ err = cops->delete(q, cl);
if (err == 0)
tclass_notify(skb, n, q, cl, RTM_DELTCLASS);
goto out;
@@ -1431,7 +1433,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
}
new_cl = cl;
- err = cops->change(q, clid, pid, tca, &new_cl);
+ err = -EOPNOTSUPP;
+ if (cops->change)
+ err = cops->change(q, clid, pid, tca, &new_cl);
if (err == 0)
tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS);
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index ace7902b5097..a9e646bdb605 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -42,12 +42,6 @@ static void ingress_put(struct Qdisc *sch, unsigned long cl)
{
}
-static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
- struct nlattr **tca, unsigned long *arg)
-{
- return 0;
-}
-
static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
return;
@@ -120,7 +114,6 @@ static const struct Qdisc_class_ops ingress_class_ops = {
.leaf = ingress_leaf,
.get = ingress_get,
.put = ingress_put,
- .change = ingress_change,
.walk = ingress_walk,
.tcf_chain = ingress_find_tcf,
.bind_tcf = ingress_bind_filter,
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 912731203047..a0ffe7158ff3 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -348,26 +348,6 @@ static void multiq_put(struct Qdisc *q, unsigned long cl)
return;
}
-static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
- struct nlattr **tca, unsigned long *arg)
-{
- unsigned long cl = *arg;
- struct multiq_sched_data *q = qdisc_priv(sch);
-
- if (cl - 1 > q->bands)
- return -ENOENT;
- return 0;
-}
-
-static int multiq_delete(struct Qdisc *sch, unsigned long cl)
-{
- struct multiq_sched_data *q = qdisc_priv(sch);
- if (cl - 1 > q->bands)
- return -ENOENT;
- return 0;
-}
-
-
static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
@@ -430,8 +410,6 @@ static const struct Qdisc_class_ops multiq_class_ops = {
.leaf = multiq_leaf,
.get = multiq_get,
.put = multiq_put,
- .change = multiq_change,
- .delete = multiq_delete,
.walk = multiq_walk,
.tcf_chain = multiq_find_tcf,
.bind_tcf = multiq_bind,
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 94cecef70145..209a4ca4b98d 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -311,25 +311,6 @@ static void prio_put(struct Qdisc *q, unsigned long cl)
return;
}
-static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct nlattr **tca, unsigned long *arg)
-{
- unsigned long cl = *arg;
- struct prio_sched_data *q = qdisc_priv(sch);
-
- if (cl - 1 > q->bands)
- return -ENOENT;
- return 0;
-}
-
-static int prio_delete(struct Qdisc *sch, unsigned long cl)
-{
- struct prio_sched_data *q = qdisc_priv(sch);
- if (cl - 1 > q->bands)
- return -ENOENT;
- return 0;
-}
-
-
static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb,
struct tcmsg *tcm)
{
@@ -392,8 +373,6 @@ static const struct Qdisc_class_ops prio_class_ops = {
.leaf = prio_leaf,
.get = prio_get,
.put = prio_put,
- .change = prio_change,
- .delete = prio_delete,
.walk = prio_walk,
.tcf_chain = prio_find_tcf,
.bind_tcf = prio_bind,
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index c27b8023f079..a2c4d1aa3cb1 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -308,17 +308,6 @@ static void red_put(struct Qdisc *sch, unsigned long arg)
return;
}
-static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
- struct nlattr **tca, unsigned long *arg)
-{
- return -ENOSYS;
-}
-
-static int red_delete(struct Qdisc *sch, unsigned long cl)
-{
- return -ENOSYS;
-}
-
static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
if (!walker->stop) {
@@ -336,8 +325,6 @@ static const struct Qdisc_class_ops red_class_ops = {
.leaf = red_leaf,
.get = red_get,
.put = red_put,
- .change = red_change_class,
- .delete = red_delete,
.walk = red_walk,
.dump = red_dump_class,
};
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 8706920a6d45..cb21380c0605 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -496,12 +496,6 @@ nla_put_failure:
return -1;
}
-static int sfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
- struct nlattr **tca, unsigned long *arg)
-{
- return -EOPNOTSUPP;
-}
-
static unsigned long sfq_get(struct Qdisc *sch, u32 classid)
{
return 0;
@@ -560,7 +554,6 @@ static void sfq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
static const struct Qdisc_class_ops sfq_class_ops = {
.get = sfq_get,
- .change = sfq_change_class,
.tcf_chain = sfq_find_tcf,
.dump = sfq_dump_class,
.dump_stats = sfq_dump_class_stats,
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 28909699d24d..d904167e73b3 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -410,17 +410,6 @@ static void tbf_put(struct Qdisc *sch, unsigned long arg)
{
}
-static int tbf_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
- struct nlattr **tca, unsigned long *arg)
-{
- return -ENOSYS;
-}
-
-static int tbf_delete(struct Qdisc *sch, unsigned long arg)
-{
- return -ENOSYS;
-}
-
static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker)
{
if (!walker->stop) {
@@ -439,8 +428,6 @@ static const struct Qdisc_class_ops tbf_class_ops =
.leaf = tbf_leaf,
.get = tbf_get,
.put = tbf_put,
- .change = tbf_change_class,
- .delete = tbf_delete,
.walk = tbf_walk,
.dump = tbf_dump_class,
};