diff options
| author | Cong Wang <cwang@twopensource.com> | 2014-04-25 13:54:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-27 23:42:39 -0400 |
| commit | 2f7ef2f8790f5bf53db4fc6b2310943139285827 (patch) | |
| tree | f2deb92bec03f3af01b9d7c1bf4dfb7b97760ecf /net/sched/cls_bpf.c | |
| parent | 4940b8cd1bc6d452eaffa442d92a28534850ca78 (diff) | |
| download | linux-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_bpf.c')
| -rw-r--r-- | net/sched/cls_bpf.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c index 8e3cf49118e3..16186965af97 100644 --- a/net/sched/cls_bpf.c +++ b/net/sched/cls_bpf.c @@ -156,7 +156,7 @@ static void cls_bpf_put(struct tcf_proto *tp, unsigned long f) static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, struct cls_bpf_prog *prog, unsigned long base, struct nlattr **tb, - struct nlattr *est) + struct nlattr *est, bool ovr) { struct sock_filter *bpf_ops, *bpf_old; struct tcf_exts exts; @@ -170,7 +170,7 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp, return -EINVAL; tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE); - ret = tcf_exts_validate(net, tp, tb, est, &exts); + ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr); if (ret < 0) return ret; @@ -242,7 +242,7 @@ static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp, static int cls_bpf_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 cls_bpf_head *head = tp->root; struct cls_bpf_prog *prog = (struct cls_bpf_prog *) *arg; @@ -260,7 +260,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, if (handle && prog->handle != handle) return -EINVAL; return cls_bpf_modify_existing(net, tp, prog, base, tb, - tca[TCA_RATE]); + tca[TCA_RATE], ovr); } prog = kzalloc(sizeof(*prog), GFP_KERNEL); @@ -277,7 +277,7 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, goto errout; } - ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE]); + ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE], ovr); if (ret < 0) goto errout; |