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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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net/bridge/br_vlan.c
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@@ -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,