From: Xin Long <lucien.xin@gmail.com>
Date: Sun, 13 Sep 2020 19:51:50 +0800
Subject: net: sched: only keep the available bits when setting vxlan md->gbp
Patch-mainline: v5.9-rc7
Git-commit: 13e6ce98aa65ab5ce19351c020419360dfe8af29
References: bsc#1176447
As we can see from vxlan_build/parse_gbp_hdr(), when processing metadata
on vxlan rx/tx path, only dont_learn/policy_applied/policy_id fields can
be set to or parse from the packet for vxlan gbp option.
So we'd better do the mask when set it in act_tunnel_key and cls_flower.
Otherwise, when users don't know these bits, they may configure with a
value which can never be matched.
Reported-by: Shuang Li <shuali@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
include/net/vxlan.h | 3 +++
net/sched/act_tunnel_key.c | 1 +
net/sched/cls_flower.c | 4 +++-
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -121,6 +121,9 @@ struct vxlanhdr_gbp {
#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
#define VXLAN_GBP_ID_MASK (0xFFFF)
+#define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \
+ VXLAN_GBP_ID_MASK)
+
/*
* VXLAN Generic Protocol Extension (VXLAN_F_GPE):
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -156,6 +156,7 @@ tunnel_key_copy_vxlan_opt(const struct n
struct vxlan_metadata *md = dst;
md->gbp = nla_get_u32(tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]);
+ md->gbp &= VXLAN_GBP_MASK;
}
return sizeof(struct vxlan_metadata);
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1175,8 +1175,10 @@ static int fl_set_vxlan_opt(const struct
return -EINVAL;
}
- if (tb[TCA_FLOWER_KEY_ENC_OPT_VXLAN_GBP])
+ if (tb[TCA_FLOWER_KEY_ENC_OPT_VXLAN_GBP]) {
md->gbp = nla_get_u32(tb[TCA_FLOWER_KEY_ENC_OPT_VXLAN_GBP]);
+ md->gbp &= VXLAN_GBP_MASK;
+ }
return sizeof(*md);
}