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authorCong Wang <cwang@twopensource.com>2014-04-25 13:54:06 -0700
committerDavid S. Miller <davem@davemloft.net>2014-04-27 23:42:39 -0400
commit2f7ef2f8790f5bf53db4fc6b2310943139285827 (patch)
treef2deb92bec03f3af01b9d7c1bf4dfb7b97760ecf /net/sched/cls_fw.c
parent4940b8cd1bc6d452eaffa442d92a28534850ca78 (diff)
downloadlinux-2f7ef2f8790f5bf53db4fc6b2310943139285827.tar.bz2
sched, cls: check if we could overwrite actions when changing a filter
When actions are attached to a filter, they are a part of the filter itself, so when changing a filter we should allow to overwrite the actions inside as well. In my specific case, when I tried to _append_ a new action to an existing filter which already has an action, I got EEXIST since kernel refused to overwrite the existing one in kernel. This patch checks if we are changing the filter checking NLM_F_CREATE flag (Sigh, filters don't use NLM_F_REPLACE...) and then passes the boolean down to actions. This fixes the problem above. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Cong Wang <cwang@twopensource.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/cls_fw.c')
-rw-r--r--net/sched/cls_fw.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 63a3ce75c02e..861b03ccfed0 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -169,7 +169,7 @@ static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
static int
fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
- struct nlattr **tb, struct nlattr **tca, unsigned long base)
+ struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr)
{
struct fw_head *head = tp->root;
struct tcf_exts e;
@@ -177,7 +177,7 @@ fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
int err;
tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
- err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e);
+ err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
if (err < 0)
return err;
@@ -218,7 +218,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
struct tcf_proto *tp, unsigned long base,
u32 handle,
struct nlattr **tca,
- unsigned long *arg)
+ unsigned long *arg, bool ovr)
{
struct fw_head *head = tp->root;
struct fw_filter *f = (struct fw_filter *) *arg;
@@ -236,7 +236,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
if (f != NULL) {
if (f->id != handle && handle)
return -EINVAL;
- return fw_change_attrs(net, tp, f, tb, tca, base);
+ return fw_change_attrs(net, tp, f, tb, tca, base, ovr);
}
if (!handle)
@@ -264,7 +264,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
f->id = handle;
- err = fw_change_attrs(net, tp, f, tb, tca, base);
+ err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
if (err < 0)
goto errout;