bridge: cfm: Netlink Notifications.

This is the implementation of Netlink notifications out of CFM.

Notifications are initiated whenever a state change happens in CFM.

IFLA_BRIDGE_CFM:
    Points to the CFM information.

IFLA_BRIDGE_CFM_MEP_STATUS_INFO:
    This indicate that the MEP instance status are following.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO:
    This indicate that the peer MEP status are following.

CFM nested attribute has the following attributes in next level.

IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE:
    The MEP instance number of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN:
    The MEP instance received CFM PDU with unexpected Opcode.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN:
    The MEP instance received CFM PDU with unexpected version.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN:
    The MEP instance received CCM PDU with MD level lower than
    configured level. This frame is discarded.
    The type is NLA_U32 (bool).

IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE:
    The MEP instance number of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID:
    The added Peer MEP ID of the delivered status.
    The type is NLA_U32.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT:
    The CCM defect status.
    The type is NLA_U32 (bool).
    True means no CCM frame is received for 3.25 intervals.
    IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI:
    The last received CCM PDU RDI.
    The type is NLA_U32 (bool).
IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE:
    The last received CCM PDU Port Status TLV value field.
    The type is NLA_U8.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE:
    The last received CCM PDU Interface Status TLV value field.
    The type is NLA_U8.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN:
    A CCM frame has been received from Peer MEP.
    The type is NLA_U32 (bool).
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN:
    A CCM frame with TLV has been received from Peer MEP.
    The type is NLA_U32 (bool).
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN:
    A CCM frame with unexpected sequence number has been received
    from Peer MEP.
    The type is NLA_U32 (bool).
    When a sequence number is not one higher than previously received
    then it is unexpected.
    This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.

Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund@microchip.com>
Reviewed-by: Horatiu Vultur  <horatiu.vultur@microchip.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 63 insertions, 10 deletions

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 68c2ed87e26b..6952d4852942 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -94,9 +94,11 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev,
 {
 	struct net_bridge_vlan_group *vg = NULL;
 	struct net_bridge_port *p = NULL;
-	struct net_bridge *br;
-	int num_vlan_infos;
+	struct net_bridge *br = NULL;
+	u32 num_cfm_peer_mep_infos;
+	u32 num_cfm_mep_infos;
 	size_t vinfo_sz = 0;
+	int num_vlan_infos;
 
 	rcu_read_lock();
 	if (netif_is_bridge_port(dev)) {
@@ -115,6 +117,49 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev,
 	/* Each VLAN is returned in bridge_vlan_info along with flags */
 	vinfo_sz += num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
 
+	if (!(filter_mask & RTEXT_FILTER_CFM_STATUS))
+		return vinfo_sz;
+
+	if (!br)
+		return vinfo_sz;
+
+	/* CFM status info must be added */
+	br_cfm_mep_count(br, &num_cfm_mep_infos);
+	br_cfm_peer_mep_count(br, &num_cfm_peer_mep_infos);
+
+	vinfo_sz += nla_total_size(0);	/* IFLA_BRIDGE_CFM */
+	/* For each status struct the MEP instance (u32) is added */
+	/* MEP instance (u32) + br_cfm_mep_status */
+	vinfo_sz += num_cfm_mep_infos *
+		     /*IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE */
+		    (nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN */
+		     + nla_total_size(sizeof(u32)));
+	/* MEP instance (u32) + br_cfm_cc_peer_status */
+	vinfo_sz += num_cfm_peer_mep_infos *
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE */
+		    (nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE */
+		     + nla_total_size(sizeof(u8))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE */
+		     + nla_total_size(sizeof(u8))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN */
+		     + nla_total_size(sizeof(u32))
+		     /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN */
+		     + nla_total_size(sizeof(u32)));
+
 	return vinfo_sz;
 }
 
@@ -378,7 +423,8 @@ nla_put_failure:
 static int br_fill_ifinfo(struct sk_buff *skb,
 			  const struct net_bridge_port *port,
 			  u32 pid, u32 seq, int event, unsigned int flags,
-			  u32 filter_mask, const struct net_device *dev)
+			  u32 filter_mask, const struct net_device *dev,
+			  bool getlink)
 {
 	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
 	struct nlattr *af = NULL;
@@ -499,7 +545,7 @@ static int br_fill_ifinfo(struct sk_buff *skb,
 
 		if (filter_mask & RTEXT_FILTER_CFM_STATUS) {
 			rcu_read_lock();
-			err = br_cfm_status_fill_info(skb, br);
+			err = br_cfm_status_fill_info(skb, br, getlink);
 			rcu_read_unlock();
 			if (err)
 				goto nla_put_failure;
@@ -519,11 +565,9 @@ nla_put_failure:
 	return -EMSGSIZE;
 }
 
-/* Notify listeners of a change in bridge or port information */
-void br_ifinfo_notify(int event, const struct net_bridge *br,
-		      const struct net_bridge_port *port)
+void br_info_notify(int event, const struct net_bridge *br,
+		    const struct net_bridge_port *port, u32 filter)
 {
-	u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
 	struct net_device *dev;
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
@@ -548,7 +592,7 @@ void br_ifinfo_notify(int event, const struct net_bridge *br,
 	if (skb == NULL)
 		goto errout;
 
-	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev);
+	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev, false);
 	if (err < 0) {
 		/* -EMSGSIZE implies BUG in br_nlmsg_size() */
 		WARN_ON(err == -EMSGSIZE);
@@ -561,6 +605,15 @@ errout:
 	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 }
 
+/* Notify listeners of a change in bridge or port information */
+void br_ifinfo_notify(int event, const struct net_bridge *br,
+		      const struct net_bridge_port *port)
+{
+	u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
+
+	return br_info_notify(event, br, port, filter);
+}
+
 /*
  * Dump information about all ports, in response to GETLINK
  */
@@ -577,7 +630,7 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 		return 0;
 
 	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
-			      filter_mask, dev);
+			      filter_mask, dev, true);
 }
 
 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,