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Message-Id: <20241001073225.807419-5-dongml2@chinatelecom.cn>
Date: Tue, 1 Oct 2024 15:32:17 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: idosch@...dia.com,
kuba@...nel.org,
aleksander.lobakin@...el.com,
horms@...nel.org
Cc: davem@...emloft.net,
edumazet@...gle.com,
pabeni@...hat.com,
dsahern@...nel.org,
dongml2@...natelecom.cn,
amcohen@...dia.com,
gnault@...hat.com,
bpoirier@...dia.com,
b.galvani@...il.com,
razor@...ckwall.org,
petrm@...dia.com,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH net-next v4 04/12] net: vxlan: add skb drop reasons to vxlan_rcv()
Introduce skb drop reasons to the function vxlan_rcv(). Following new
drop reasons are added:
SKB_DROP_REASON_VXLAN_INVALID_HDR
SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND
SKB_DROP_REASON_IP_TUNNEL_ECN
Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
v3:
- modify vxlan_set_mac() and vxlan_remcsum() after this patch
v2:
- rename the drop reasons, as Ido advised.
- document the drop reasons
---
drivers/net/vxlan/vxlan_core.c | 26 ++++++++++++++++++++------
include/net/dropreason-core.h | 16 ++++++++++++++++
2 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 53dcb9fffc04..04c56f952f29 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -1671,13 +1671,15 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
struct vxlan_metadata _md;
struct vxlan_metadata *md = &_md;
__be16 protocol = htons(ETH_P_TEB);
+ enum skb_drop_reason reason;
bool raw_proto = false;
void *oiph;
__be32 vni = 0;
int nh;
/* Need UDP and VXLAN header to be present */
- if (!pskb_may_pull(skb, VXLAN_HLEN))
+ reason = pskb_may_pull_reason(skb, VXLAN_HLEN);
+ if (reason)
goto drop;
unparsed = *vxlan_hdr(skb);
@@ -1686,6 +1688,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
ntohl(vxlan_hdr(skb)->vx_flags),
ntohl(vxlan_hdr(skb)->vx_vni));
+ reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
/* Return non vxlan pkt */
goto drop;
}
@@ -1699,8 +1702,10 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
- if (!vxlan)
+ if (!vxlan) {
+ reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND;
goto drop;
+ }
/* For backwards compatibility, only allow reserved fields to be
* used by VXLAN extensions if explicitly requested.
@@ -1713,8 +1718,10 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
}
if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
- !net_eq(vxlan->net, dev_net(vxlan->dev))))
+ !net_eq(vxlan->net, dev_net(vxlan->dev)))) {
+ reason = SKB_DROP_REASON_NOMEM;
goto drop;
+ }
if (vs->flags & VXLAN_F_REMCSUM_RX)
if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
@@ -1728,8 +1735,10 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags,
key32_to_tunnel_id(vni), sizeof(*md));
- if (!tun_dst)
+ if (!tun_dst) {
+ reason = SKB_DROP_REASON_NOMEM;
goto drop;
+ }
md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
@@ -1753,6 +1762,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
* is more robust and provides a little more security in
* adding extensions to VXLAN.
*/
+ reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
goto drop;
}
@@ -1773,7 +1783,8 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
skb_reset_network_header(skb);
- if (!pskb_inet_may_pull(skb)) {
+ reason = pskb_inet_may_pull_reason(skb);
+ if (reason) {
DEV_STATS_INC(vxlan->dev, rx_length_errors);
DEV_STATS_INC(vxlan->dev, rx_errors);
vxlan_vnifilter_count(vxlan, vni, vninode,
@@ -1785,6 +1796,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
oiph = skb->head + nh;
if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
+ reason = SKB_DROP_REASON_IP_TUNNEL_ECN;
DEV_STATS_INC(vxlan->dev, rx_frame_errors);
DEV_STATS_INC(vxlan->dev, rx_errors);
vxlan_vnifilter_count(vxlan, vni, vninode,
@@ -1799,6 +1811,7 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
dev_core_stats_rx_dropped_inc(vxlan->dev);
vxlan_vnifilter_count(vxlan, vni, vninode,
VXLAN_VNI_STATS_RX_DROPS, 0);
+ reason = SKB_DROP_REASON_DEV_READY;
goto drop;
}
@@ -1811,8 +1824,9 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
return 0;
drop:
+ reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED;
/* Consume bad packet */
- kfree_skb(skb);
+ kfree_skb_reason(skb, reason);
return 0;
}
diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 4748680e8c88..98259d2b3e92 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -92,6 +92,9 @@
FN(PACKET_SOCK_ERROR) \
FN(TC_CHAIN_NOTFOUND) \
FN(TC_RECLASSIFY_LOOP) \
+ FN(VXLAN_INVALID_HDR) \
+ FN(VXLAN_VNI_NOT_FOUND) \
+ FN(IP_TUNNEL_ECN) \
FNe(MAX)
/**
@@ -418,6 +421,19 @@ enum skb_drop_reason {
* iterations.
*/
SKB_DROP_REASON_TC_RECLASSIFY_LOOP,
+ /**
+ * @SKB_DROP_REASON_VXLAN_INVALID_HDR: VXLAN header is invalid. E.g.:
+ * 1) reserved fields are not zero
+ * 2) "I" flag is not set
+ */
+ SKB_DROP_REASON_VXLAN_INVALID_HDR,
+ /** @SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND: no VXLAN device found for VNI */
+ SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND,
+ /**
+ * @SKB_DROP_REASON_IP_TUNNEL_ECN: skb is dropped according to
+ * RFC 6040 4.2, see __INET_ECN_decapsulate() for detail.
+ */
+ SKB_DROP_REASON_IP_TUNNEL_ECN,
/**
* @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
* shouldn't be used as a real 'reason' - only for tracing code gen
--
2.39.5
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