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net: bridge: vlan: add basic option setting support

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This patch adds support for option modification of single vlans and
ranges. It allows to only modify options, i.e. skip create/delete by
using the BRIDGE_VLAN_INFO_ONLY_OPTS flag. When working with a range
option changes we try to pack the notifications as much as possible.

v2: do full port (all vlans) notification only when creating/deleting
    vlans for compatibility, rework the range detection when changing
    options, add more verbose extack errors and check if a vlan should
    be used (br_vlan_should_use checks)

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov
2020-01-24 13:40:21 +02:00
committed by David S. Miller
parent 7a53e718c5
commit a5d29ae226
4 changed files with 130 additions and 7 deletions
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87
net/bridge/br_vlan_options.c
View File

@@ -23,3 +23,90 @@ size_t br_vlan_opts_nl_size(void)
{
return 0;
}
static int br_vlan_process_one_opts(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan_group *vg,
struct net_bridge_vlan *v,
struct nlattr **tb,
bool *changed,
struct netlink_ext_ack *extack)
{
*changed = false;
return 0;
}
int br_vlan_process_options(const struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_vlan *range_start,
struct net_bridge_vlan *range_end,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct net_bridge_vlan *v, *curr_start = NULL, *curr_end = NULL;
struct net_bridge_vlan_group *vg;
int vid, err = 0;
u16 pvid;
if (p)
vg = nbp_vlan_group(p);
else
vg = br_vlan_group(br);
if (!range_start || !br_vlan_should_use(range_start)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan range start doesn't exist, can't process options");
return -ENOENT;
}
if (!range_end || !br_vlan_should_use(range_end)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan range end doesn't exist, can't process options");
return -ENOENT;
}
pvid = br_get_pvid(vg);
for (vid = range_start->vid; vid <= range_end->vid; vid++) {
bool changed = false;
v = br_vlan_find(vg, vid);
if (!v || !br_vlan_should_use(v)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan in range doesn't exist, can't process options");
err = -ENOENT;
break;
}
err = br_vlan_process_one_opts(br, p, vg, v, tb, &changed,
extack);
if (err)
break;
if (changed) {
/* vlan options changed, check for range */
if (!curr_start) {
curr_start = v;
curr_end = v;
continue;
}
if (v->vid == pvid ||
!br_vlan_can_enter_range(v, curr_end)) {
br_vlan_notify(br, p, curr_start->vid,
curr_end->vid, RTM_NEWVLAN);
curr_start = v;
}
curr_end = v;
} else {
/* nothing changed and nothing to notify yet */
if (!curr_start)
continue;
br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
RTM_NEWVLAN);
curr_start = NULL;
curr_end = NULL;
}
}
if (curr_start)
br_vlan_notify(br, p, curr_start->vid, curr_end->vid,
RTM_NEWVLAN);
return err;
}