From: Xin Long Date: Sun, 13 Sep 2020 11:51:50 +0000 (+0800) Subject: net: sched: only keep the available bits when setting vxlan md->gbp X-Git-Tag: Ubuntu-5.10.0-12.13~1881^2~35^2~1 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=13e6ce98aa65ab5ce19351c020419360dfe8af29;p=mirror_ubuntu-hirsute-kernel.git net: sched: only keep the available bits when setting vxlan md->gbp 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 Signed-off-by: Xin Long Signed-off-by: David S. Miller --- diff --git a/include/net/vxlan.h b/include/net/vxlan.h index 3a41627cbdfe..08537aa14f7c 100644 --- 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): * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c index 536c4bc31be6..37f1e10f35e0 100644 --- 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 nlattr *nla, void *dst, int dst_len, 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); diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index a4f7ef1de7e7..e8fda1bd4d9d 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -1175,8 +1175,10 @@ static int fl_set_vxlan_opt(const struct nlattr *nla, struct fl_flow_key *key, 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); }