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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2020-01-14 19:56:13 +0200
committerDavid S. Miller <davem@davemloft.net>2020-01-15 13:48:18 +0100
commitcf5bddb95cbe5340e486e84d46cf2f0bb324078c (patch)
tree923bb238f1560e66f220e385b647971b476c19b1 /net/bridge
parent0ab558795184f87b532363e262357160d25f5d64 (diff)
downloadlinux-cf5bddb95cbe5340e486e84d46cf2f0bb324078c.tar.gz
net: bridge: vlan: add rtnetlink group and notify support
Add a new rtnetlink group for bridge vlan notifications - RTNLGRP_BRVLAN and add support for sending vlan notifications (both single and ranges). No functional changes intended, the notification support will be used by later patches. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_private.h11
-rw-r--r--net/bridge/br_vlan.c79
2 files changed, 90 insertions, 0 deletions
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index ee3871dea68f..ba162c8197da 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -960,6 +960,10 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
void *ptr);
void br_vlan_rtnl_init(void);
void br_vlan_rtnl_uninit(void);
+void br_vlan_notify(const struct net_bridge *br,
+ const struct net_bridge_port *p,
+ u16 vid, u16 vid_range,
+ int cmd);
static inline struct net_bridge_vlan_group *br_vlan_group(
const struct net_bridge *br)
@@ -1166,6 +1170,13 @@ static inline void br_vlan_rtnl_init(void)
static inline void br_vlan_rtnl_uninit(void)
{
}
+
+static inline void br_vlan_notify(const struct net_bridge *br,
+ const struct net_bridge_port *p,
+ u16 vid, u16 vid_range,
+ int cmd)
+{
+}
#endif
struct nf_br_ops {
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 9d64a86f2cbd..5d52a2604547 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1540,6 +1540,85 @@ out_err:
return false;
}
+static size_t rtnl_vlan_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct br_vlan_msg))
+ + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */
+ + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */
+ + nla_total_size(sizeof(struct bridge_vlan_info)); /* BRIDGE_VLANDB_ENTRY_INFO */
+}
+
+void br_vlan_notify(const struct net_bridge *br,
+ const struct net_bridge_port *p,
+ u16 vid, u16 vid_range,
+ int cmd)
+{
+ struct net_bridge_vlan_group *vg;
+ struct net_bridge_vlan *v;
+ struct br_vlan_msg *bvm;
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+ struct net *net;
+ u16 flags = 0;
+ int ifindex;
+
+ /* right now notifications are done only with rtnl held */
+ ASSERT_RTNL();
+
+ if (p) {
+ ifindex = p->dev->ifindex;
+ vg = nbp_vlan_group(p);
+ net = dev_net(p->dev);
+ } else {
+ ifindex = br->dev->ifindex;
+ vg = br_vlan_group(br);
+ net = dev_net(br->dev);
+ }
+
+ skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL);
+ if (!skb)
+ goto out_err;
+
+ err = -EMSGSIZE;
+ nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0);
+ if (!nlh)
+ goto out_err;
+ bvm = nlmsg_data(nlh);
+ memset(bvm, 0, sizeof(*bvm));
+ bvm->family = AF_BRIDGE;
+ bvm->ifindex = ifindex;
+
+ switch (cmd) {
+ case RTM_NEWVLAN:
+ /* need to find the vlan due to flags/options */
+ v = br_vlan_find(vg, vid);
+ if (!v || !br_vlan_should_use(v))
+ goto out_kfree;
+
+ flags = v->flags;
+ if (br_get_pvid(vg) == v->vid)
+ flags |= BRIDGE_VLAN_INFO_PVID;
+ break;
+ case RTM_DELVLAN:
+ break;
+ default:
+ goto out_kfree;
+ }
+
+ if (!br_vlan_fill_vids(skb, vid, vid_range, flags))
+ goto out_err;
+
+ nlmsg_end(skb, nlh);
+ rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL);
+ return;
+
+out_err:
+ rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err);
+out_kfree:
+ kfree_skb(skb);
+}
+
/* check if v_curr can enter a range ending in range_end */
static bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
const struct net_bridge_vlan *range_end)