[PATCH v4] net: hsr: Provide RedBox support (HSR-SAN)

From: Lukasz Majewski
Date: Tue Apr 02 2024 - 04:59:27 EST

Introduce RedBox support (HSR-SAN to be more precise) for HSR networks.
Following traffic reduction optimizations have been implemented:
- Do not send HSR supervisory frames to Port C (interlink)
- Do not forward to HSR ring frames addressed to Port C
- Do not forward to Port C frames from HSR ring
- Do not send duplicate HSR frame to HSR ring when destination is Port C

The corresponding patch to modify iptable2 sources has already been sent:
https://lore.kernel.org/netdev/20240308145729.490863-1-lukma@xxxxxxx/T/

Testing procedure:
------------------
The EVB-KSZ9477 has been used for testing on net-next branch
(SHA1: 5fc68320c1fb3c7d456ddcae0b4757326a043e6f).

Ports 4/5 were used for SW managed HSR (hsr1) as first hsr0 for ports 1/2
(with HW offloading for ksz9477) was created. Port 3 has been used as
interlink port (single USB-ETH dongle).

Configuration - RedBox (EVB-KSZ9477):
if link set lan1 down;ip link set lan2 down
ip link add name hsr0 type hsr slave1 lan1 slave2 lan2 supervision 45 version 1
ip link add name hsr1 type hsr slave1 lan4 slave2 lan5 interlink lan3 supervision 45 version 1
ip link set lan4 up;ip link set lan5 up
ip link set lan3 up
ip addr add 192.168.0.11/24 dev hsr1
ip link set hsr1 up

Configuration - DAN-H (EVB-KSZ9477):

ip link set lan1 down;ip link set lan2 down
ip link add name hsr0 type hsr slave1 lan1 slave2 lan2 supervision 45 version 1
ip link add name hsr1 type hsr slave1 lan4 slave2 lan5 supervision 45 version 1
ip link set lan4 up;ip link set lan5 up
ip addr add 192.168.0.12/24 dev hsr1
ip link set hsr1 up

This approach uses only SW based HSR devices (hsr1).

-------------- ----------------- ------------
DAN-H Port5 | <------> | Port5 | |
Port4 | <------> | Port4 Port3 | <---> | PC
| | (RedBox) | | (USB-ETH)
EVB-KSZ9477 | | EVB-KSZ9477 | |
-------------- ----------------- ------------

Signed-off-by: Lukasz Majewski <lukma@xxxxxxx>

---
Changes for v2:

- Add deleting of HSR_PT_INTERLINK node to hsr_del_ports()
- Rewrite handle_std_frame() to awoid code duplication
- Fix reverse christmas tree in hsr_prune_proxy_nodes() as well as
remove stale node indication as interlink doesn't need this detection
(only check if node is inactive for more than HSR_PROXY_NODE_FORGET_TIME
is required)
- Rewrite commit message

Changes for v3:

- Modify frame passed Port C (Interlink) to have RedBox's source address (SA)
This fixes issue with connecting L2 switch to Interlink Port as switches
drop frames with SA other than one registered in their (internal) routing
tables.

- Do not forward to port C (Interlink) frames from nodes A and B if DA is
in NodeTable.

- Fix problem with ProxyNodeTable being pollued by nodes already registered
in HSR ring.

- Prevent from sending frames to HSR ring when destination addresses (DA)
are in ProxyNodeTable

Changes for v4:

- Replace memcpy() with dedicated ether_addr_copy() function

- Update commit message description to replace ifconfig with ip command
usage
---
include/uapi/linux/if_link.h | 1 +
net/hsr/hsr_device.c | 36 ++++++++++++++-
net/hsr/hsr_device.h | 4 +-
net/hsr/hsr_forward.c | 85 ++++++++++++++++++++++++++++++++----
net/hsr/hsr_framereg.c | 52 ++++++++++++++++++++++
net/hsr/hsr_framereg.h | 6 +++
net/hsr/hsr_main.h | 7 +++
net/hsr/hsr_netlink.c | 29 ++++++++++--
net/hsr/hsr_slave.c | 1 +
9 files changed, 205 insertions(+), 16 deletions(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index ffa637b38c93..e9f10860ec8e 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1771,6 +1771,7 @@ enum {
IFLA_HSR_PROTOCOL, /* Indicate different protocol than
* HSR. For example PRP.
*/
+ IFLA_HSR_INTERLINK, /* HSR interlink network device */
__IFLA_HSR_MAX,
};

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index e9d45133d641..05d484b9cea4 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -146,6 +146,9 @@ static int hsr_dev_open(struct net_device *dev)
case HSR_PT_SLAVE_B:
designation = "Slave B";
break;
+ case HSR_PT_INTERLINK:
+ designation = "Interlink";
+ break;
default:
designation = "Unknown";
}
@@ -285,6 +288,7 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
struct hsr_priv *hsr = master->hsr;
__u8 type = HSR_TLV_LIFE_CHECK;
struct hsr_sup_payload *hsr_sp;
+ struct hsr_sup_tlv *hsr_stlv;
struct hsr_sup_tag *hsr_stag;
struct sk_buff *skb;

@@ -324,6 +328,16 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);

+ if (hsr->redbox) {
+ hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv));
+ hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC;
+ hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload);
+
+ /* Payload: MacAddressRedBox */
+ hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
+ ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox);
+ }
+
if (skb_put_padto(skb, ETH_ZLEN)) {
spin_unlock_bh(&hsr->seqnr_lock);
return;
@@ -408,6 +422,10 @@ void hsr_del_ports(struct hsr_priv *hsr)
port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
if (port)
hsr_del_port(port);
+
+ port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
+ if (port)
+ hsr_del_port(port);
}

static void hsr_set_rx_mode(struct net_device *dev)
@@ -534,8 +552,8 @@ static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
};

int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
- unsigned char multicast_spec, u8 protocol_version,
- struct netlink_ext_ack *extack)
+ struct net_device *interlink, unsigned char multicast_spec,
+ u8 protocol_version, struct netlink_ext_ack *extack)
{
bool unregister = false;
struct hsr_priv *hsr;
@@ -544,6 +562,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
hsr = netdev_priv(hsr_dev);
INIT_LIST_HEAD(&hsr->ports);
INIT_LIST_HEAD(&hsr->node_db);
+ INIT_LIST_HEAD(&hsr->proxy_node_db);
spin_lock_init(&hsr->list_lock);

eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
@@ -569,6 +588,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
/* Overflow soon to find bugs easier: */
hsr->sequence_nr = HSR_SEQNR_START;
hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
+ hsr->interlink_sequence_nr = HSR_SEQNR_START;

timer_setup(&hsr->announce_timer, hsr_announce, 0);
timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
@@ -604,6 +624,18 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
if (res)
goto err_unregister;

+ if (interlink) {
+ res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack);
+ if (res)
+ goto err_unregister;
+
+ hsr->redbox = true;
+ ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr);
+ timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0);
+ mod_timer(&hsr->prune_proxy_timer,
+ jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD));
+ }
+
hsr_debugfs_init(hsr, hsr_dev);
mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));

diff --git a/net/hsr/hsr_device.h b/net/hsr/hsr_device.h
index 9060c92168f9..655284095b78 100644
--- a/net/hsr/hsr_device.h
+++ b/net/hsr/hsr_device.h
@@ -16,8 +16,8 @@
void hsr_del_ports(struct hsr_priv *hsr);
void hsr_dev_setup(struct net_device *dev);
int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
- unsigned char multicast_spec, u8 protocol_version,
- struct netlink_ext_ack *extack);
+ struct net_device *interlink, unsigned char multicast_spec,
+ u8 protocol_version, struct netlink_ext_ack *extack);
void hsr_check_carrier_and_operstate(struct hsr_priv *hsr);
int hsr_get_max_mtu(struct hsr_priv *hsr);
#endif /* __HSR_DEVICE_H */
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index 5d68cb181695..05a61b8286ec 100644
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -377,6 +377,15 @@ static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
*/
ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
}
+
+ /* When HSR node is used as RedBox - the frame received from HSR ring
+ * requires source MAC address (SA) replacement to one which can be
+ * recognized by SAN devices (otherwise, frames are dropped by switch)
+ */
+ if (port->type == HSR_PT_INTERLINK)
+ ether_addr_copy(eth_hdr(skb)->h_source,
+ port->hsr->macaddress_redbox);
+
return dev_queue_xmit(skb);
}

@@ -390,9 +399,57 @@ bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)

bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
{
+ struct sk_buff *skb;
+
if (port->dev->features & NETIF_F_HW_HSR_FWD)
return prp_drop_frame(frame, port);

+ /* RedBox specific frames dropping policies
+ *
+ * Do not send HSR supervisory frames to SAN devices
+ */
+ if (frame->is_supervision && port->type == HSR_PT_INTERLINK)
+ return true;
+
+ /* Do not forward to other HSR port (A or B) unicast frames which
+ * are addressed to interlink port (and are in the ProxyNodeTable).
+ */
+ skb = frame->skb_hsr;
+ if (skb && prp_drop_frame(frame, port) &&
+ is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
+ hsr_is_node_in_db(&port->hsr->proxy_node_db,
+ eth_hdr(skb)->h_dest)) {
+ return true;
+ }
+
+ /* Do not forward to port C (Interlink) frames from nodes A and B
+ * if DA is in NodeTable.
+ */
+ if ((frame->port_rcv->type == HSR_PT_SLAVE_A ||
+ frame->port_rcv->type == HSR_PT_SLAVE_B) &&
+ port->type == HSR_PT_INTERLINK) {
+ skb = frame->skb_hsr;
+ if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
+ hsr_is_node_in_db(&port->hsr->node_db,
+ eth_hdr(skb)->h_dest)) {
+ return true;
+ }
+ }
+
+ /* Do not forward to port A and B unicast frames received on the
+ * interlink port if it is addressed to one of nodes registered in
+ * the ProxyNodeTable.
+ */
+ if ((port->type == HSR_PT_SLAVE_A || port->type == HSR_PT_SLAVE_B) &&
+ frame->port_rcv->type == HSR_PT_INTERLINK) {
+ skb = frame->skb_std;
+ if (skb && is_unicast_ether_addr(eth_hdr(skb)->h_dest) &&
+ hsr_is_node_in_db(&port->hsr->proxy_node_db,
+ eth_hdr(skb)->h_dest)) {
+ return true;
+ }
+ }
+
return false;
}

@@ -448,13 +505,14 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
}

/* Check if frame is to be dropped. Eg. for PRP no forward
- * between ports.
+ * between ports, or sending HSR supervision to RedBox.
*/
if (hsr->proto_ops->drop_frame &&
hsr->proto_ops->drop_frame(frame, port))
continue;

- if (port->type != HSR_PT_MASTER)
+ if (port->type == HSR_PT_SLAVE_A ||
+ port->type == HSR_PT_SLAVE_B)
skb = hsr->proto_ops->create_tagged_frame(frame, port);
else
skb = hsr->proto_ops->get_untagged_frame(frame, port);
@@ -469,7 +527,9 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
hsr_deliver_master(skb, port->dev, frame->node_src);
} else {
if (!hsr_xmit(skb, port, frame))
- sent = true;
+ if (port->type == HSR_PT_SLAVE_A ||
+ port->type == HSR_PT_SLAVE_B)
+ sent = true;
}
}
}
@@ -503,10 +563,12 @@ static void handle_std_frame(struct sk_buff *skb,
frame->skb_prp = NULL;
frame->skb_std = skb;

- if (port->type != HSR_PT_MASTER) {
+ if (port->type != HSR_PT_MASTER)
frame->is_from_san = true;
- } else {
- /* Sequence nr for the master node */
+
+ if (port->type == HSR_PT_MASTER ||
+ port->type == HSR_PT_INTERLINK) {
+ /* Sequence nr for the master/interlink node */
lockdep_assert_held(&hsr->seqnr_lock);
frame->sequence_nr = hsr->sequence_nr;
hsr->sequence_nr++;
@@ -564,6 +626,7 @@ static int fill_frame_info(struct hsr_frame_info *frame,
{
struct hsr_priv *hsr = port->hsr;
struct hsr_vlan_ethhdr *vlan_hdr;
+ struct list_head *n_db;
struct ethhdr *ethhdr;
__be16 proto;
int ret;
@@ -574,9 +637,13 @@ static int fill_frame_info(struct hsr_frame_info *frame,

memset(frame, 0, sizeof(*frame));
frame->is_supervision = is_supervision_frame(port->hsr, skb);
- frame->node_src = hsr_get_node(port, &hsr->node_db, skb,
- frame->is_supervision,
- port->type);
+
+ n_db = &hsr->node_db;
+ if (port->type == HSR_PT_INTERLINK)
+ n_db = &hsr->proxy_node_db;
+
+ frame->node_src = hsr_get_node(port, n_db, skb,
+ frame->is_supervision, port->type);
if (!frame->node_src)
return -1; /* Unknown node and !is_supervision, or no mem */

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 26329db09210..614df9649794 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -71,6 +71,14 @@ static struct hsr_node *find_node_by_addr_A(struct list_head *node_db,
return NULL;
}

+/* Check if node for a given MAC address is already present in data base
+ */
+bool hsr_is_node_in_db(struct list_head *node_db,
+ const unsigned char addr[ETH_ALEN])
+{
+ return !!find_node_by_addr_A(node_db, addr);
+}
+
/* Helper for device init; the self_node is used in hsr_rcv() to recognize
* frames from self that's been looped over the HSR ring.
*/
@@ -223,6 +231,15 @@ struct hsr_node *hsr_get_node(struct hsr_port *port, struct list_head *node_db,
}
}

+ /* Check if required node is not in proxy nodes table */
+ list_for_each_entry_rcu(node, &hsr->proxy_node_db, mac_list) {
+ if (ether_addr_equal(node->macaddress_A, ethhdr->h_source)) {
+ if (hsr->proto_ops->update_san_info)
+ hsr->proto_ops->update_san_info(node, is_sup);
+ return node;
+ }
+ }
+
/* Everyone may create a node entry, connected node to a HSR/PRP
* device.
*/
@@ -418,6 +435,10 @@ void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,

node_dst = find_node_by_addr_A(&port->hsr->node_db,
eth_hdr(skb)->h_dest);
+ if (!node_dst && port->hsr->redbox)
+ node_dst = find_node_by_addr_A(&port->hsr->proxy_node_db,
+ eth_hdr(skb)->h_dest);
+
if (!node_dst) {
if (port->hsr->prot_version != PRP_V1 && net_ratelimit())
netdev_err(skb->dev, "%s: Unknown node\n", __func__);
@@ -561,6 +582,37 @@ void hsr_prune_nodes(struct timer_list *t)
jiffies + msecs_to_jiffies(PRUNE_PERIOD));
}

+void hsr_prune_proxy_nodes(struct timer_list *t)
+{
+ struct hsr_priv *hsr = from_timer(hsr, t, prune_proxy_timer);
+ unsigned long timestamp;
+ struct hsr_node *node;
+ struct hsr_node *tmp;
+
+ spin_lock_bh(&hsr->list_lock);
+ list_for_each_entry_safe(node, tmp, &hsr->proxy_node_db, mac_list) {
+ timestamp = node->time_in[HSR_PT_INTERLINK];
+
+ /* Prune old entries */
+ if (time_is_before_jiffies(timestamp +
+ msecs_to_jiffies(HSR_PROXY_NODE_FORGET_TIME))) {
+ hsr_nl_nodedown(hsr, node->macaddress_A);
+ if (!node->removed) {
+ list_del_rcu(&node->mac_list);
+ node->removed = true;
+ /* Note that we need to free this entry later: */
+ kfree_rcu(node, rcu_head);
+ }
+ }
+ }
+
+ spin_unlock_bh(&hsr->list_lock);
+
+ /* Restart timer */
+ mod_timer(&hsr->prune_proxy_timer,
+ jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD));
+}
+
void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
unsigned char addr[ETH_ALEN])
{
diff --git a/net/hsr/hsr_framereg.h b/net/hsr/hsr_framereg.h
index b23556251d62..67456a75d8fe 100644
--- a/net/hsr/hsr_framereg.h
+++ b/net/hsr/hsr_framereg.h
@@ -46,6 +46,7 @@ int hsr_register_frame_out(struct hsr_port *port, struct hsr_node *node,
u16 sequence_nr);

void hsr_prune_nodes(struct timer_list *t);
+void hsr_prune_proxy_nodes(struct timer_list *t);

int hsr_create_self_node(struct hsr_priv *hsr,
const unsigned char addr_a[ETH_ALEN],
@@ -63,10 +64,15 @@ int hsr_get_node_data(struct hsr_priv *hsr,
int *if2_age,
u16 *if2_seq);

+void hsr_handle_san_frame(bool san, enum hsr_port_type port,
+ struct hsr_node *node);
void prp_handle_san_frame(bool san, enum hsr_port_type port,
struct hsr_node *node);
void prp_update_san_info(struct hsr_node *node, bool is_sup);

+bool hsr_is_node_in_db(struct list_head *node_db,
+ const unsigned char addr[ETH_ALEN]);
+
struct hsr_node {
struct list_head mac_list;
/* Protect R/W access to seq_out */
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 18e01791ad79..23850b16d1ea 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -21,6 +21,7 @@
*/
#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
#define HSR_NODE_FORGET_TIME 60000 /* ms */
+#define HSR_PROXY_NODE_FORGET_TIME 60000 /* ms */
#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
#define HSR_ENTRY_FORGET_TIME 400 /* ms */

@@ -35,6 +36,7 @@
* HSR_NODE_FORGET_TIME?
*/
#define PRUNE_PERIOD 3000 /* ms */
+#define PRUNE_PROXY_PERIOD 3000 /* ms */
#define HSR_TLV_EOT 0 /* End of TLVs */
#define HSR_TLV_ANNOUNCE 22
#define HSR_TLV_LIFE_CHECK 23
@@ -192,11 +194,14 @@ struct hsr_priv {
struct rcu_head rcu_head;
struct list_head ports;
struct list_head node_db; /* Known HSR nodes */
+ struct list_head proxy_node_db; /* RedBox HSR proxy nodes */
struct hsr_self_node __rcu *self_node; /* MACs of slaves */
struct timer_list announce_timer; /* Supervision frame dispatch */
struct timer_list prune_timer;
+ struct timer_list prune_proxy_timer;
int announce_count;
u16 sequence_nr;
+ u16 interlink_sequence_nr; /* Interlink port seq_nr */
u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
spinlock_t seqnr_lock; /* locking for sequence_nr */
@@ -209,6 +214,8 @@ struct hsr_priv {
* of lan_id
*/
bool fwd_offloaded; /* Forwarding offloaded to HW */
+ bool redbox; /* Device supports HSR RedBox */
+ unsigned char macaddress_redbox[ETH_ALEN];
unsigned char sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16));
/* Align to u16 boundary to avoid unaligned access
* in ether_addr_equal
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 78fe40eb9f01..86eae49009cb 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -23,6 +23,7 @@ static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
[IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
[IFLA_HSR_PROTOCOL] = { .type = NLA_U8 },
+ [IFLA_HSR_INTERLINK] = { .type = NLA_U32 },
};

/* Here, it seems a netdevice has already been allocated for us, and the
@@ -35,8 +36,8 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
enum hsr_version proto_version;
unsigned char multicast_spec;
u8 proto = HSR_PROTOCOL_HSR;
- struct net_device *link[2];

+ struct net_device *link[2], *interlink = NULL;
if (!data) {
NL_SET_ERR_MSG_MOD(extack, "No slave devices specified");
return -EINVAL;
@@ -67,6 +68,20 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
return -EINVAL;
}

+ if (data[IFLA_HSR_INTERLINK])
+ interlink = __dev_get_by_index(src_net,
+ nla_get_u32(data[IFLA_HSR_INTERLINK]));
+
+ if (interlink && interlink == link[0]) {
+ NL_SET_ERR_MSG_MOD(extack, "Interlink and Slave1 are the same");
+ return -EINVAL;
+ }
+
+ if (interlink && interlink == link[1]) {
+ NL_SET_ERR_MSG_MOD(extack, "Interlink and Slave2 are the same");
+ return -EINVAL;
+ }
+
if (!data[IFLA_HSR_MULTICAST_SPEC])
multicast_spec = 0;
else
@@ -96,10 +111,17 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
}
}

- if (proto == HSR_PROTOCOL_PRP)
+ if (proto == HSR_PROTOCOL_PRP) {
proto_version = PRP_V1;
+ if (interlink) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Interlink only works with HSR");
+ return -EINVAL;
+ }
+ }

- return hsr_dev_finalize(dev, link, multicast_spec, proto_version, extack);
+ return hsr_dev_finalize(dev, link, interlink, multicast_spec,
+ proto_version, extack);
}

static void hsr_dellink(struct net_device *dev, struct list_head *head)
@@ -114,6 +136,7 @@ static void hsr_dellink(struct net_device *dev, struct list_head *head)

hsr_del_self_node(hsr);
hsr_del_nodes(&hsr->node_db);
+ hsr_del_nodes(&hsr->proxy_node_db);

unregister_netdevice_queue(dev, head);
}
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
index 1b6457f357bd..af6cf64a00e0 100644
--- a/net/hsr/hsr_slave.c
+++ b/net/hsr/hsr_slave.c
@@ -55,6 +55,7 @@ static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
protocol = eth_hdr(skb)->h_proto;

if (!(port->dev->features & NETIF_F_HW_HSR_TAG_RM) &&
+ port->type != HSR_PT_INTERLINK &&
hsr->proto_ops->invalid_dan_ingress_frame &&
hsr->proto_ops->invalid_dan_ingress_frame(protocol))
goto finish_pass;
--
2.20.1