diff mbox series

[net-next,v9,1/2] net: vxlan: Add nolocalbypass option to vxlan.

Message ID 20230512034034.16778-1-vladimir@nikishkin.pw (mailing list archive)
State Accepted
Commit 69474a8a5837be63f13c6f60a7d622b98ed5c539
Headers show
Series [net-next,v9,1/2] net: vxlan: Add nolocalbypass option to vxlan. | expand

Commit Message

Vladimir Nikishkin May 12, 2023, 3:40 a.m. UTC 
If a packet needs to be encapsulated towards a local destination IP, the
packet will undergo a "local bypass" and be injected into the Rx path as
if it was received by the target VXLAN device without undergoing
encapsulation. If such a device does not exist, the packet will be
dropped.

There are scenarios where we do not want to perform such a bypass, but
instead want the packet to be encapsulated and locally received by a
user space program for post-processing.

To that end, add a new VXLAN device attribute that controls whether a
"local bypass" is performed or not. Default to performing a bypass to
maintain existing behavior.

Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
v8=>v9
1. Update commit message to mention "local bypass".
2. Update "summary phrase" to include net:  as suggested by
https://patchwork.kernel.org/project/netdevbpf/patch/20230510200247.1534793-1-u.kleine-koenig@pengutronix.de/
3. Add reviewer's reviewed-by.

 drivers/net/vxlan/vxlan_core.c | 21 +++++++++++++++++++--
 include/net/vxlan.h            |  4 +++-
 include/uapi/linux/if_link.h   |  1 +
 3 files changed, 23 insertions(+), 3 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org May 13, 2023, 7:10 p.m. UTC | #1 
Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Fri, 12 May 2023 11:40:33 +0800 you wrote:
> If a packet needs to be encapsulated towards a local destination IP, the
> packet will undergo a "local bypass" and be injected into the Rx path as
> if it was received by the target VXLAN device without undergoing
> encapsulation. If such a device does not exist, the packet will be
> dropped.
> 
> There are scenarios where we do not want to perform such a bypass, but
> instead want the packet to be encapsulated and locally received by a
> user space program for post-processing.
> 
> [...]

Here is the summary with links:
  - [net-next,v9,1/2] net: vxlan: Add nolocalbypass option to vxlan.
    https://git.kernel.org/netdev/net-next/c/69474a8a5837
  - [net-next,v9,2/2] selftests: net: vxlan: Add tests for vxlan nolocalbypass option.
    https://git.kernel.org/netdev/net-next/c/305c04189997

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index 561fe1b314f5..78744549c1b3 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -2352,7 +2352,8 @@  static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
 #endif
 	/* Bypass encapsulation if the destination is local */
 	if (rt_flags & RTCF_LOCAL &&
-	    !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
+	    !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
+	    vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) {
 		struct vxlan_dev *dst_vxlan;
 
 		dst_release(dst);
@@ -3172,6 +3173,7 @@  static void vxlan_raw_setup(struct net_device *dev)
 }
 
 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
+	[IFLA_VXLAN_UNSPEC]     = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS },
 	[IFLA_VXLAN_ID]		= { .type = NLA_U32 },
 	[IFLA_VXLAN_GROUP]	= { .len = sizeof_field(struct iphdr, daddr) },
 	[IFLA_VXLAN_GROUP6]	= { .len = sizeof(struct in6_addr) },
@@ -3202,6 +3204,7 @@  static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
 	[IFLA_VXLAN_TTL_INHERIT]	= { .type = NLA_FLAG },
 	[IFLA_VXLAN_DF]		= { .type = NLA_U8 },
 	[IFLA_VXLAN_VNIFILTER]	= { .type = NLA_U8 },
+	[IFLA_VXLAN_LOCALBYPASS]	= NLA_POLICY_MAX(NLA_U8, 1),
 };
 
 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
@@ -4011,6 +4014,17 @@  static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
 			conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
 	}
 
+	if (data[IFLA_VXLAN_LOCALBYPASS]) {
+		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS,
+				    VXLAN_F_LOCALBYPASS, changelink,
+				    true, extack);
+		if (err)
+			return err;
+	} else if (!changelink) {
+		/* default to local bypass on a new device */
+		conf->flags |= VXLAN_F_LOCALBYPASS;
+	}
+
 	if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
 		err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
 				    VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
@@ -4232,6 +4246,7 @@  static size_t vxlan_get_size(const struct net_device *dev)
 		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
 		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
 		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
+		nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */
 		0;
 }
 
@@ -4308,7 +4323,9 @@  static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
 		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
 	    nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
-		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
+		       !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) ||
+	    nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS,
+		       !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS)))
 		goto nla_put_failure;
 
 	if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 20bd7d893e10..0be91ca78d3a 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -328,6 +328,7 @@  struct vxlan_dev {
 #define VXLAN_F_TTL_INHERIT		0x10000
 #define VXLAN_F_VNIFILTER               0x20000
 #define VXLAN_F_MDB			0x40000
+#define VXLAN_F_LOCALBYPASS		0x80000
 
 /* Flags that are used in the receive path. These flags must match in
  * order for a socket to be shareable
@@ -348,7 +349,8 @@  struct vxlan_dev {
 					 VXLAN_F_UDP_ZERO_CSUM6_TX |	\
 					 VXLAN_F_UDP_ZERO_CSUM6_RX |	\
 					 VXLAN_F_COLLECT_METADATA  |	\
-					 VXLAN_F_VNIFILTER)
+					 VXLAN_F_VNIFILTER         |    \
+					 VXLAN_F_LOCALBYPASS)
 
 struct net_device *vxlan_dev_create(struct net *net, const char *name,
 				    u8 name_assign_type, struct vxlan_config *conf);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 4ac1000b0ef2..0f6a0fe09bdb 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -828,6 +828,7 @@  enum {
 	IFLA_VXLAN_TTL_INHERIT,
 	IFLA_VXLAN_DF,
 	IFLA_VXLAN_VNIFILTER, /* only applicable with COLLECT_METADATA mode */
+	IFLA_VXLAN_LOCALBYPASS,
 	__IFLA_VXLAN_MAX
 };
 #define IFLA_VXLAN_MAX	(__IFLA_VXLAN_MAX - 1)