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net: bridge: vlan options: add support for tunnel mapping set/del

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This patch adds support for manipulating vlan/tunnel mappings. The
tunnel ids are globally unique and are one per-vlan. There were two
trickier issues - first in order to support vlan ranges we have to
compute the current tunnel id in the following way:
 - base tunnel id (attr) + current vlan id - starting vlan id
This is in line how the old API does vlan/tunnel mapping with ranges. We
already have the vlan range present, so it's redundant to add another
attribute for the tunnel range end. It's simply base tunnel id + vlan
range. And second to support removing mappings we need an out-of-band way
to tell the option manipulating function because there are no
special/reserved tunnel id values, so we use a vlan flag to denote the
operation is tunnel mapping removal.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-03-17 14:08:36 +02:00 committed by David S. Miller
parent 188c67dd19
commit 569da08228
5 changed files with 45 additions and 2 deletions
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1
include/uapi/linux/if_bridge.h
View File

@ -131,6 +131,7 @@ enum {
#define BRIDGE_VLAN_INFO_RANGE_END (1<<4) /* VLAN is end of vlan range */
#define BRIDGE_VLAN_INFO_BRENTRY (1<<5) /* Global bridge VLAN entry */
#define BRIDGE_VLAN_INFO_ONLY_OPTS (1<<6) /* Skip create/delete/flags */
#define BRIDGE_VLAN_INFO_REMOVE_TUN (1<<7) /* Remove tunnel mapping */
struct bridge_vlan_info {
__u16 flags;

4
net/bridge/br_netlink_tunnel.c
View File

@ -193,8 +193,8 @@ static const struct nla_policy vlan_tunnel_policy[IFLA_BRIDGE_VLAN_TUNNEL_MAX +
[IFLA_BRIDGE_VLAN_TUNNEL_FLAGS] = { .type = NLA_U16 },
};
static int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
u16 vid, u32 tun_id, bool *changed)
int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
u16 vid, u32 tun_id, bool *changed)
{
int err = 0;

2
net/bridge/br_private_tunnel.h
View File

@ -45,6 +45,8 @@ int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
struct net_bridge_vlan *vlan);
bool vlan_tunid_inrange(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *v_last);
int br_vlan_tunnel_info(const struct net_bridge_port *p, int cmd,
u16 vid, u32 tun_id, bool *changed);
#else
static inline int vlan_tunnel_init(struct net_bridge_vlan_group *vg)
{

1
net/bridge/br_vlan.c
View File

@ -1839,6 +1839,7 @@ static const struct nla_policy br_vlan_db_policy[BRIDGE_VLANDB_ENTRY_MAX + 1] =
.len = sizeof(struct bridge_vlan_info) },
[BRIDGE_VLANDB_ENTRY_RANGE] = { .type = NLA_U16 },
[BRIDGE_VLANDB_ENTRY_STATE] = { .type = NLA_U8 },
[BRIDGE_VLANDB_ENTRY_TUNNEL_ID] = { .type = NLA_U32 },
};
static int br_vlan_rtm_process_one(struct net_device *dev,

39
net/bridge/br_vlan_options.c
View File

@ -85,6 +85,40 @@ static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
return 0;
}
static int br_vlan_modify_tunnel(const struct net_bridge_port *p,
struct net_bridge_vlan *v,
struct nlattr **tb,
bool *changed,
struct netlink_ext_ack *extack)
{
struct bridge_vlan_info *vinfo;
int cmdmap;
u32 tun_id;
if (!p) {
NL_SET_ERR_MSG_MOD(extack, "Can't modify tunnel mapping of non-port vlans");
return -EINVAL;
}
if (!(p->flags & BR_VLAN_TUNNEL)) {
NL_SET_ERR_MSG_MOD(extack, "Port doesn't have tunnel flag set");
return -EINVAL;
}
/* vlan info attribute is guaranteed by br_vlan_rtm_process_one */
vinfo = nla_data(tb[BRIDGE_VLANDB_ENTRY_INFO]);
cmdmap = vinfo->flags & BRIDGE_VLAN_INFO_REMOVE_TUN ? RTM_DELLINK :
RTM_SETLINK;
/* when working on vlan ranges this represents the starting tunnel id */
tun_id = nla_get_u32(tb[BRIDGE_VLANDB_ENTRY_TUNNEL_ID]);
/* tunnel ids are mapped to each vlan in increasing order,
* the starting vlan is in BRIDGE_VLANDB_ENTRY_INFO and v is the
* current vlan, so we compute: tun_id + v - vinfo->vid
*/
tun_id += v->vid - vinfo->vid;
return br_vlan_tunnel_info(p, cmdmap, v->vid, tun_id, changed);
}
static int br_vlan_process_one_opts(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
@ -103,6 +137,11 @@ static int br_vlan_process_one_opts(const struct net_bridge *br,
if (err)
return err;
}
if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_ID]) {
err = br_vlan_modify_tunnel(p, v, tb, changed, extack);
if (err)
return err;
}
return 0;
}