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net: bridge: vlan options: nest the tunnel id into a tunnel info attribute

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While discussing the new API, Roopa mentioned that we'll be adding more
tunnel attributes and options in the future, so it's better to make it a
nested attribute, since this is still in net-next we can easily change it
and nest the tunnel id attribute under BRIDGE_VLANDB_ENTRY_TUNNEL_INFO.

The new format is:
 [BRIDGE_VLANDB_ENTRY]
     [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO]
         [BRIDGE_VLANDB_TINFO_ID]

Any new tunnel attributes can be nested under
BRIDGE_VLANDB_ENTRY_TUNNEL_INFO.

Suggested-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-03-20 13:23:02 +02:00 committed by David S. Miller
parent ee9d0cb6c4
commit fa388f29a9
3 changed files with 47 additions and 8 deletions
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16
include/uapi/linux/if_bridge.h
View File

@ -203,12 +203,26 @@ enum {
BRIDGE_VLANDB_ENTRY_INFO,
BRIDGE_VLANDB_ENTRY_RANGE,
BRIDGE_VLANDB_ENTRY_STATE,
BRIDGE_VLANDB_ENTRY_TUNNEL_ID,
BRIDGE_VLANDB_ENTRY_TUNNEL_INFO,
BRIDGE_VLANDB_ENTRY_STATS,
__BRIDGE_VLANDB_ENTRY_MAX,
};
#define BRIDGE_VLANDB_ENTRY_MAX (__BRIDGE_VLANDB_ENTRY_MAX - 1)
/* [BRIDGE_VLANDB_ENTRY] = {
* [BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = {
* [BRIDGE_VLANDB_TINFO_ID]
* ...
* }
* }
*/
enum {
BRIDGE_VLANDB_TINFO_UNSPEC,
BRIDGE_VLANDB_TINFO_ID,
__BRIDGE_VLANDB_TINFO_MAX,
};
#define BRIDGE_VLANDB_TINFO_MAX (__BRIDGE_VLANDB_TINFO_MAX - 1)
/* [BRIDGE_VLANDB_ENTRY] = {
* [BRIDGE_VLANDB_ENTRY_STATS] = {
* [BRIDGE_VLANDB_STATS_RX_BYTES]

2
net/bridge/br_vlan.c
View File

@ -1888,7 +1888,7 @@ 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 },
[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO] = { .type = NLA_NESTED },
};
static int br_vlan_rtm_process_one(struct net_device *dev,

37
net/bridge/br_vlan_options.c
View File

@ -12,12 +12,21 @@
static bool __vlan_tun_put(struct sk_buff *skb, const struct net_bridge_vlan *v)
{
__be32 tid = tunnel_id_to_key32(v->tinfo.tunnel_id);
struct nlattr *nest;
if (!v->tinfo.tunnel_dst)
return true;
return !nla_put_u32(skb, BRIDGE_VLANDB_ENTRY_TUNNEL_ID,
be32_to_cpu(tid));
nest = nla_nest_start(skb, BRIDGE_VLANDB_ENTRY_TUNNEL_INFO);
if (!nest)
return false;
if (nla_put_u32(skb, BRIDGE_VLANDB_TINFO_ID, be32_to_cpu(tid))) {
nla_nest_cancel(skb, nest);
return false;
}
nla_nest_end(skb, nest);
return true;
}
static bool __vlan_tun_can_enter_range(const struct net_bridge_vlan *v_curr,
@ -45,7 +54,8 @@ bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v)
size_t br_vlan_opts_nl_size(void)
{
return nla_total_size(sizeof(u8)) /* BRIDGE_VLANDB_ENTRY_STATE */
+ nla_total_size(sizeof(u32)); /* BRIDGE_VLANDB_ENTRY_TUNNEL_ID */
+ nla_total_size(0) /* BRIDGE_VLANDB_ENTRY_TUNNEL_INFO */
+ nla_total_size(sizeof(u32)); /* BRIDGE_VLANDB_TINFO_ID */
}
static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
@ -85,14 +95,19 @@ static int br_vlan_modify_state(struct net_bridge_vlan_group *vg,
return 0;
}
static const struct nla_policy br_vlandb_tinfo_pol[BRIDGE_VLANDB_TINFO_MAX + 1] = {
[BRIDGE_VLANDB_TINFO_ID] = { .type = NLA_U32 },
};
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 nlattr *tun_tb[BRIDGE_VLANDB_TINFO_MAX + 1], *attr;
struct bridge_vlan_info *vinfo;
int cmdmap;
int cmdmap, err;
u32 tun_id;
if (!p) {
@ -104,12 +119,22 @@ static int br_vlan_modify_tunnel(const struct net_bridge_port *p,
return -EINVAL;
}
attr = tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO];
err = nla_parse_nested(tun_tb, BRIDGE_VLANDB_TINFO_MAX, attr,
br_vlandb_tinfo_pol, extack);
if (err)
return err;
if (!tun_tb[BRIDGE_VLANDB_TINFO_ID]) {
NL_SET_ERR_MSG_MOD(extack, "Missing tunnel id attribute");
return -ENOENT;
}
/* 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]);
tun_id = nla_get_u32(tun_tb[BRIDGE_VLANDB_TINFO_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
@ -137,7 +162,7 @@ static int br_vlan_process_one_opts(const struct net_bridge *br,
if (err)
return err;
}
if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_ID]) {
if (tb[BRIDGE_VLANDB_ENTRY_TUNNEL_INFO]) {
err = br_vlan_modify_tunnel(p, v, tb, changed, extack);
if (err)
return err;