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Date: Sat, 30 Sep 2023 09:28:19 -0500
From: Alce Lafranque <alce@...ranque.net>
To: "David S. Miller" <davem@...emloft.net>,Eric Dumazet <edumazet@...gle.com>,Jakub Kicinski <kuba@...nel.org>,Paolo Abeni <pabeni@...hat.com>,David Ahern <dsahern@...nel.org>,Ido Schimmel <idosch@...dia.com>,netdev@...r.kernel.org
Cc: vincent@...nat.ch,alce@...ranque.net
Subject: [PATCH net-next] vxlan: add support for flowlabel inherit
By default, VXLAN encapsulation over IPv6 sets the flow label to 0, with an
option for a fixed value. This commits add the ability to inherit the flow
label from the inner packet, like for other tunnel implementations.
```
$ ./ip/ip addr add 2001:db8::2/64 dev dummy1
$ ./ip/ip link set up dev dummy1
$ ./ip/ip link add vxlan1 type vxlan id 100 flowlabel inherit remote 2001:db8::1 local 2001:db8::2
$ ./ip/ip link set up dev vxlan1
$ ./ip/ip addr add 2001:db8:1::2/64 dev vxlan1
$ ./ip/ip link set arp off dev vxlan1
$ ping -q 2001:db8:1::1 &
$ tshark -d udp.port==8472,vxlan -Vpni dummy1 -c1
[...]
Internet Protocol Version 6, Src: 2001:db8::2, Dst: 2001:db8::1
0110 .... = Version: 6
.... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
.... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
.... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
.... 1011 0001 1010 1111 1011 = Flow Label: 0xb1afb
[...]
Virtual eXtensible Local Area Network
Flags: 0x0800, VXLAN Network ID (VNI)
Group Policy ID: 0
VXLAN Network Identifier (VNI): 100
[...]
Internet Protocol Version 6, Src: 2001:db8:1::2, Dst: 2001:db8:1::1
0110 .... = Version: 6
.... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
.... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
.... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
.... 1011 0001 1010 1111 1011 = Flow Label: 0xb1afb
```
Signed-off-by: Alce Lafranque <alce@...ranque.net>
Co-developed-by: Vincent Bernat <vincent@...nat.ch>
Signed-off-by: Vincent Bernat <vincent@...nat.ch>
---
drivers/net/vxlan/vxlan_core.c | 20 ++++++++++++++++++--
include/net/ip_tunnels.h | 11 +++++++++++
include/net/vxlan.h | 2 ++
include/uapi/linux/if_link.h | 1 +
4 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 5b5597073b00..aa7fbfdd93b1 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -2475,7 +2475,11 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
else
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
#if IS_ENABLED(CONFIG_IPV6)
- label = vxlan->cfg.label;
+ if (flags & VXLAN_F_LABEL_INHERIT) {
+ label = ip_tunnel_get_flowlabel(old_iph, skb);
+ } else {
+ label = vxlan->cfg.label;
+ }
#endif
} else {
if (!info) {
@@ -3286,6 +3290,7 @@ static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
[IFLA_VXLAN_DF] = { .type = NLA_U8 },
[IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 },
[IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1),
+ [IFLA_VXLAN_LABEL_INHERIT] = { .type = NLA_FLAG },
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
@@ -4001,7 +4006,15 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
if (data[IFLA_VXLAN_LABEL])
conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
- IPV6_FLOWLABEL_MASK;
+ IPV6_FLOWLABEL_MASK;
+
+ if (data[IFLA_VXLAN_LABEL_INHERIT]) {
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LABEL_INHERIT,
+ VXLAN_F_LABEL_INHERIT, changelink, false,
+ extack);
+ if (err)
+ return err;
+ }
if (data[IFLA_VXLAN_LEARNING]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
@@ -4315,6 +4328,7 @@ static size_t vxlan_get_size(const struct net_device *dev)
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LABEL_INHERIT */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
@@ -4387,6 +4401,8 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
+ nla_put_u8(skb, IFLA_VXLAN_LABEL_INHERIT,
+ !!(vxlan->cfg.flags & VXLAN_F_LABEL_INHERIT)) ||
nla_put_u8(skb, IFLA_VXLAN_LEARNING,
!!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
nla_put_u8(skb, IFLA_VXLAN_PROXY,
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index f346b4efbc30..2d746f4c9a0a 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -416,6 +416,17 @@ static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
return 0;
}
+static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph,
+ const struct sk_buff *skb)
+{
+ __be16 payload_protocol = skb_protocol(skb, true);
+
+ if (payload_protocol == htons(ETH_P_IPV6))
+ return ip6_flowlabel((const struct ipv6hdr *)iph);
+ else
+ return 0;
+}
+
static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph,
const struct sk_buff *skb)
{
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 6a9f8a5f387c..f82ce013c8ff 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -329,6 +329,7 @@ struct vxlan_dev {
#define VXLAN_F_VNIFILTER 0x20000
#define VXLAN_F_MDB 0x40000
#define VXLAN_F_LOCALBYPASS 0x80000
+#define VXLAN_F_LABEL_INHERIT 0x100000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
@@ -534,6 +535,7 @@ static inline void vxlan_flag_attr_error(int attrtype,
break
switch (attrtype) {
VXLAN_FLAG(TTL_INHERIT);
+ VXLAN_FLAG(LABEL_INHERIT);
VXLAN_FLAG(LEARNING);
VXLAN_FLAG(PROXY);
VXLAN_FLAG(RSC);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index fac351a93aed..bd69af34feba 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -830,6 +830,7 @@ enum {
IFLA_VXLAN_DF,
IFLA_VXLAN_VNIFILTER, /* only applicable with COLLECT_METADATA mode */
IFLA_VXLAN_LOCALBYPASS,
+ IFLA_VXLAN_LABEL_INHERIT,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
--
2.39.2
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