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bridge: per vlan dst_metadata netlink support

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This patch adds support to attach per vlan tunnel info dst
metadata. This enables bridge driver to map vlan to tunnel_info
at ingress and egress. It uses the kernel dst_metadata infrastructure.

The initial use case is vlan to vni bridging, but the api is generic
to extend to any tunnel_info in the future:
    - Uapi to configure/unconfigure/dump per vlan tunnel data
    - netlink functions to configure vlan and tunnel_info mapping
    - Introduces bridge port flag BR_LWT_VLAN to enable attach/detach
    dst_metadata to bridged packets on ports. off by default.
    - changes to existing code is mainly refactor some existing vlan
    handling netlink code + hooks for new vlan tunnel code
    - I have kept the vlan tunnel code isolated in separate files.
    - most of the netlink vlan tunnel code is handling of vlan-tunid
    ranges (follows the vlan range handling code). To conserve space
    vlan-tunid by default are always dumped in ranges if applicable.

Use case:
example use for this is a vxlan bridging gateway or vtep
which maps vlans to vn-segments (or vnis).

iproute2 example (patched and pruned iproute2 output to just show
relevant fdb entries):
example shows same host mac learnt on two vni's and
vlan 100 maps to vni 1000, vlan 101 maps to vni 1001

before (netdev per vni):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan1001 vlan 101 master bridge
00:02:00:00:00:03 dev vxlan1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan1000 vlan 100 master bridge
00:02:00:00:00:03 dev vxlan1000 dst 12.0.0.8 self

after this patch with collect metdata in bridged mode (single netdev):
$bridge fdb show | grep "00:02:00:00:00:03"
00:02:00:00:00:03 dev vxlan0 vlan 101 master bridge
00:02:00:00:00:03 dev vxlan0 src_vni 1001 dst 12.0.0.8 self
00:02:00:00:00:03 dev vxlan0 vlan 100 master bridge
00:02:00:00:00:03 dev vxlan0 src_vni 1000 dst 12.0.0.8 self

CC: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu
2017-01-31 22:59:54 -08:00
committed by David S. Miller
parent b3c7ef0ada
commit efa5356b0d
7 changed files with 644 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

72
net/bridge/br_private_tunnel.h Normal file
View File

@@ -0,0 +1,72 @@
/*
* Bridge per vlan tunnels
*
* Authors:
* Roopa Prabhu <roopa@cumulusnetworks.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _BR_PRIVATE_TUNNEL_H
#define _BR_PRIVATE_TUNNEL_H
struct vtunnel_info {
u32 tunid;
u16 vid;
u16 flags;
};
/* br_netlink_tunnel.c */
int br_parse_vlan_tunnel_info(struct nlattr *attr,
struct vtunnel_info *tinfo);
int br_process_vlan_tunnel_info(struct net_bridge *br,
struct net_bridge_port *p,
int cmd,
struct vtunnel_info *tinfo_curr,
struct vtunnel_info *tinfo_last);
int br_get_vlan_tunnel_info_size(struct net_bridge_vlan_group *vg);
int br_fill_vlan_tunnel_info(struct sk_buff *skb,
struct net_bridge_vlan_group *vg);
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
/* br_vlan_tunnel.c */
int vlan_tunnel_init(struct net_bridge_vlan_group *vg);
void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg);
int nbp_vlan_tunnel_info_delete(struct net_bridge_port *port, u16 vid);
int nbp_vlan_tunnel_info_add(struct net_bridge_port *port, u16 vid, u32 tun_id);
void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port);
void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *vlan);
#else
static inline int vlan_tunnel_init(struct net_bridge_vlan_group *vg)
{
return 0;
}
static inline int nbp_vlan_tunnel_info_delete(struct net_bridge_port *port,
u16 vid)
{
return 0;
}
static inline int nbp_vlan_tunnel_info_add(struct net_bridge_port *port,
u16 vid, u32 tun_id)
{
return 0;
}
static inline void nbp_vlan_tunnel_info_flush(struct net_bridge_port *port)
{
}
static inline void vlan_tunnel_info_del(struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *vlan)
{
}
#endif
#endif