[PATCH v3 net-next] net: hsr: Send supervisory frames to HSR network with ProxyNodeTable data

From: Lukasz Majewski
Date: Mon Jun 10 2024 - 09:39:56 EST

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This patch provides support for sending supervision HSR frames with
MAC addresses stored in ProxyNodeTable when RedBox (i.e. HSR-SAN) is
enabled.

Supervision frames with RedBox MAC address (appended as second TLV)
are only send for ProxyNodeTable nodes.

This patch series shall be tested with hsr_redbox.sh script.

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

Changes for v2:
- Fix the Reverse Christmas Tree formatting
- Return directly values from hsr_is_node_in_db() and ether_addr_equal()
- Change the internal variable check

Changes for v3:
- Change 'const unsigned char addr[ETH_ALEN]' to
'const unsigned char *addr' in send_hsr/prp_supervision_frame() functions

- Add sizeof(struct hsr_sup_payload) to pskb_may_pull to assure that the
payload is present.
---
net/hsr/hsr_device.c | 63 ++++++++++++++++++++++++++++++++++--------
net/hsr/hsr_forward.c | 37 +++++++++++++++++++++++--
net/hsr/hsr_framereg.c | 12 ++++++++
net/hsr/hsr_framereg.h | 2 ++
net/hsr/hsr_main.h | 4 ++-
net/hsr/hsr_netlink.c | 1 +
6 files changed, 105 insertions(+), 14 deletions(-)

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index e6904288d40d..e4cc6b78dcfc 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -73,9 +73,15 @@ static void hsr_check_announce(struct net_device *hsr_dev)
mod_timer(&hsr->announce_timer, jiffies +
msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL));
}
+
+ if (hsr->redbox && !timer_pending(&hsr->announce_proxy_timer))
+ mod_timer(&hsr->announce_proxy_timer, jiffies +
+ msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL) / 2);
} else {
/* Deactivate the announce timer */
timer_delete(&hsr->announce_timer);
+ if (hsr->redbox)
+ timer_delete(&hsr->announce_proxy_timer);
}
}

@@ -279,10 +285,11 @@ static struct sk_buff *hsr_init_skb(struct hsr_port *master)
return NULL;
}

-static void send_hsr_supervision_frame(struct hsr_port *master,
- unsigned long *interval)
+static void send_hsr_supervision_frame(struct hsr_port *port,
+ unsigned long *interval,
+ const unsigned char *addr)
{
- struct hsr_priv *hsr = master->hsr;
+ struct hsr_priv *hsr = port->hsr;
__u8 type = HSR_TLV_LIFE_CHECK;
struct hsr_sup_payload *hsr_sp;
struct hsr_sup_tlv *hsr_stlv;
@@ -296,9 +303,9 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
hsr->announce_count++;
}

- skb = hsr_init_skb(master);
+ skb = hsr_init_skb(port);
if (!skb) {
- netdev_warn_once(master->dev, "HSR: Could not send supervision frame\n");
+ netdev_warn_once(port->dev, "HSR: Could not send supervision frame\n");
return;
}

@@ -321,11 +328,12 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ?
sizeof(struct hsr_sup_payload) : 12;

- /* Payload: MacAddressA */
+ /* Payload: MacAddressA / SAN MAC from ProxyNodeTable */
hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
- ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
+ ether_addr_copy(hsr_sp->macaddress_A, addr);

- if (hsr->redbox) {
+ if (hsr->redbox &&
+ hsr_is_node_in_db(&hsr->proxy_node_db, addr)) {
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);
@@ -340,13 +348,14 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
return;
}

- hsr_forward_skb(skb, master);
+ hsr_forward_skb(skb, port);
spin_unlock_bh(&hsr->seqnr_lock);
return;
}

static void send_prp_supervision_frame(struct hsr_port *master,
- unsigned long *interval)
+ unsigned long *interval,
+ const unsigned char *addr)
{
struct hsr_priv *hsr = master->hsr;
struct hsr_sup_payload *hsr_sp;
@@ -396,7 +405,7 @@ static void hsr_announce(struct timer_list *t)

rcu_read_lock();
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
- hsr->proto_ops->send_sv_frame(master, &interval);
+ hsr->proto_ops->send_sv_frame(master, &interval, master->dev->dev_addr);

if (is_admin_up(master->dev))
mod_timer(&hsr->announce_timer, jiffies + interval);
@@ -404,6 +413,37 @@ static void hsr_announce(struct timer_list *t)
rcu_read_unlock();
}

+/* Announce (supervision frame) timer function for RedBox
+ */
+static void hsr_proxy_announce(struct timer_list *t)
+{
+ struct hsr_priv *hsr = from_timer(hsr, t, announce_proxy_timer);
+ struct hsr_port *interlink;
+ unsigned long interval = 0;
+ struct hsr_node *node;
+
+ rcu_read_lock();
+ /* RedBOX sends supervisory frames to HSR network with MAC addresses
+ * of SAN nodes stored in ProxyNodeTable.
+ */
+ interlink = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
+ list_for_each_entry_rcu(node, &hsr->proxy_node_db, mac_list) {
+ if (hsr_addr_is_redbox(hsr, node->macaddress_A))
+ continue;
+ hsr->proto_ops->send_sv_frame(interlink, &interval,
+ node->macaddress_A);
+ }
+
+ if (is_admin_up(interlink->dev)) {
+ if (!interval)
+ interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
+
+ mod_timer(&hsr->announce_proxy_timer, jiffies + interval);
+ }
+
+ rcu_read_unlock();
+}
+
void hsr_del_ports(struct hsr_priv *hsr)
{
struct hsr_port *port;
@@ -590,6 +630,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
timer_setup(&hsr->announce_timer, hsr_announce, 0);
timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0);
+ timer_setup(&hsr->announce_proxy_timer, hsr_proxy_announce, 0);

ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index 05a61b8286ec..960ef386bc3a 100644
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -117,6 +117,35 @@ static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
return true;
}

+static bool is_proxy_supervision_frame(struct hsr_priv *hsr,
+ struct sk_buff *skb)
+{
+ struct hsr_sup_payload *payload;
+ struct ethhdr *eth_hdr;
+ u16 total_length = 0;
+
+ eth_hdr = (struct ethhdr *)skb_mac_header(skb);
+
+ /* Get the HSR protocol revision. */
+ if (eth_hdr->h_proto == htons(ETH_P_HSR))
+ total_length = sizeof(struct hsrv1_ethhdr_sp);
+ else
+ total_length = sizeof(struct hsrv0_ethhdr_sp);
+
+ if (!pskb_may_pull(skb, total_length + sizeof(struct hsr_sup_payload)))
+ return false;
+
+ skb_pull(skb, total_length);
+ payload = (struct hsr_sup_payload *)skb->data;
+ skb_push(skb, total_length);
+
+ /* For RedBox (HSR-SAN) check if we have received the supervision
+ * frame with MAC addresses from own ProxyNodeTable.
+ */
+ return hsr_is_node_in_db(&hsr->proxy_node_db,
+ payload->macaddress_A);
+}
+
static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
struct hsr_frame_info *frame)
{
@@ -499,7 +528,8 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
frame->sequence_nr))
continue;

- if (frame->is_supervision && port->type == HSR_PT_MASTER) {
+ if (frame->is_supervision && port->type == HSR_PT_MASTER &&
+ !frame->is_proxy_supervision) {
hsr_handle_sup_frame(frame);
continue;
}
@@ -637,6 +667,9 @@ static int fill_frame_info(struct hsr_frame_info *frame,

memset(frame, 0, sizeof(*frame));
frame->is_supervision = is_supervision_frame(port->hsr, skb);
+ if (frame->is_supervision && hsr->redbox)
+ frame->is_proxy_supervision =
+ is_proxy_supervision_frame(port->hsr, skb);

n_db = &hsr->node_db;
if (port->type == HSR_PT_INTERLINK)
@@ -688,7 +721,7 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
/* Gets called for ingress frames as well as egress from master port.
* So check and increment stats for master port only here.
*/
- if (port->type == HSR_PT_MASTER) {
+ if (port->type == HSR_PT_MASTER || port->type == HSR_PT_INTERLINK) {
port->dev->stats.tx_packets++;
port->dev->stats.tx_bytes += skb->len;
}
diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 614df9649794..73bc6f659812 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -36,6 +36,14 @@ static bool seq_nr_after(u16 a, u16 b)
#define seq_nr_before(a, b) seq_nr_after((b), (a))
#define seq_nr_before_or_eq(a, b) (!seq_nr_after((a), (b)))

+bool hsr_addr_is_redbox(struct hsr_priv *hsr, unsigned char *addr)
+{
+ if (!hsr->redbox || !is_valid_ether_addr(hsr->macaddress_redbox))
+ return false;
+
+ return ether_addr_equal(addr, hsr->macaddress_redbox);
+}
+
bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
{
struct hsr_self_node *sn;
@@ -591,6 +599,10 @@ void hsr_prune_proxy_nodes(struct timer_list *t)

spin_lock_bh(&hsr->list_lock);
list_for_each_entry_safe(node, tmp, &hsr->proxy_node_db, mac_list) {
+ /* Don't prune RedBox node. */
+ if (hsr_addr_is_redbox(hsr, node->macaddress_A))
+ continue;
+
timestamp = node->time_in[HSR_PT_INTERLINK];

/* Prune old entries */
diff --git a/net/hsr/hsr_framereg.h b/net/hsr/hsr_framereg.h
index 7619e31c1d2d..993fa950d814 100644
--- a/net/hsr/hsr_framereg.h
+++ b/net/hsr/hsr_framereg.h
@@ -22,6 +22,7 @@ struct hsr_frame_info {
struct hsr_node *node_src;
u16 sequence_nr;
bool is_supervision;
+ bool is_proxy_supervision;
bool is_vlan;
bool is_local_dest;
bool is_local_exclusive;
@@ -35,6 +36,7 @@ struct hsr_node *hsr_get_node(struct hsr_port *port, struct list_head *node_db,
enum hsr_port_type rx_port);
void hsr_handle_sup_frame(struct hsr_frame_info *frame);
bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr);
+bool hsr_addr_is_redbox(struct hsr_priv *hsr, unsigned char *addr);

void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb);
void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 23850b16d1ea..ab1f8d35d9dc 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -170,7 +170,8 @@ struct hsr_node;

struct hsr_proto_ops {
/* format and send supervision frame */
- void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval);
+ void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval,
+ const unsigned char addr[ETH_ALEN]);
void (*handle_san_frame)(bool san, enum hsr_port_type port,
struct hsr_node *node);
bool (*drop_frame)(struct hsr_frame_info *frame, struct hsr_port *port);
@@ -197,6 +198,7 @@ struct hsr_priv {
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 announce_proxy_timer;
struct timer_list prune_timer;
struct timer_list prune_proxy_timer;
int announce_count;
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 898f18c6da53..f6ff0b61e08a 100644
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -131,6 +131,7 @@ static void hsr_dellink(struct net_device *dev, struct list_head *head)
del_timer_sync(&hsr->prune_timer);
del_timer_sync(&hsr->prune_proxy_timer);
del_timer_sync(&hsr->announce_timer);
+ timer_delete_sync(&hsr->announce_proxy_timer);

hsr_debugfs_term(hsr);
hsr_del_ports(hsr);
--
2.20.1

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