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authorPatrick McHardy <kaber@trash.net>2009-09-04 10:41:15 +0400
committerDavid S. Miller <davem@davemloft.net>2009-09-06 13:06:12 +0400
commit71ebe5e91947392bc276af713827eab12b6db8e4 (patch)
tree198ff02e23f8606ff2a3bec51c7044ec408e19c4 /net/sched
parentc9f1d0389b962521af1e2b699c8ee5e299d77b85 (diff)
downloadlinux-71ebe5e91947392bc276af713827eab12b6db8e4.tar.xz
net_sched: make cls_ops->tcf_chain() optional
Some qdiscs don't support attaching filters. Handle this centrally in cls_api and return a proper errno code (EOPNOTSUPP) instead of EINVAL. 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/cls_api.c5
-rw-r--r--net/sched/sch_red.c6
-rw-r--r--net/sched/sch_tbf.c6
3 files changed, 5 insertions, 12 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 09cdcdfe7e91..bcfbdb4758c9 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -181,6 +181,9 @@ replay:
if ((cops = q->ops->cl_ops) == NULL)
return -EINVAL;
+ if (cops->tcf_chain == NULL)
+ return -EOPNOTSUPP;
+
/* Do we search for filter, attached to class? */
if (TC_H_MIN(parent)) {
cl = cops->get(q, parent);
@@ -433,6 +436,8 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
goto out;
if ((cops = q->ops->cl_ops) == NULL)
goto errout;
+ if (cops->tcf_chain == NULL)
+ goto errout;
if (TC_H_MIN(tcm->tcm_parent)) {
cl = cops->get(q, tcm->tcm_parent);
if (cl == 0)
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 2bdf241f6315..c27b8023f079 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -331,11 +331,6 @@ static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
}
}
-static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
- return NULL;
-}
-
static const struct Qdisc_class_ops red_class_ops = {
.graft = red_graft,
.leaf = red_leaf,
@@ -344,7 +339,6 @@ static const struct Qdisc_class_ops red_class_ops = {
.change = red_change_class,
.delete = red_delete,
.walk = red_walk,
- .tcf_chain = red_find_tcf,
.dump = red_dump_class,
};
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index e22dfe85e43e..28909699d24d 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -433,11 +433,6 @@ static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker)
}
}
-static struct tcf_proto **tbf_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
- return NULL;
-}
-
static const struct Qdisc_class_ops tbf_class_ops =
{
.graft = tbf_graft,
@@ -447,7 +442,6 @@ static const struct Qdisc_class_ops tbf_class_ops =
.change = tbf_change_class,
.delete = tbf_delete,
.walk = tbf_walk,
- .tcf_chain = tbf_find_tcf,
.dump = tbf_dump_class,
};