Re: [PATCH v1 net-next] net: hsr: Send supervisory frames to HSR network with ProxyNodeTable data

[Wojciech Drewek]

On 03.06.2024 13:03, Lukasz Majewski wrote:
> 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>
> ---
>  net/hsr/hsr_device.c   | 63 ++++++++++++++++++++++++++++++++++--------
>  net/hsr/hsr_forward.c  | 40 +++++++++++++++++++++++++--
>  net/hsr/hsr_framereg.c | 15 ++++++++++
>  net/hsr/hsr_framereg.h |  2 ++
>  net/hsr/hsr_main.h     |  4 ++-
>  net/hsr/hsr_netlink.c  |  1 +
>  6 files changed, 111 insertions(+), 14 deletions(-)
> 
> diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
> index e6904288d40d..f85331d75454 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[ETH_ALEN])
>  {
> -	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[ETH_ALEN])
>  {
>  	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_port *interlink;
> +	unsigned long interval = 0;
> +	struct hsr_node *node;
> +	struct hsr_priv *hsr = from_timer(hsr, t, announce_proxy_timer);

RCT :)

> +
> +	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 == 0)

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..2aa2621d8517 100644
> --- a/net/hsr/hsr_forward.c
> +++ b/net/hsr/hsr_forward.c
> @@ -117,6 +117,38 @@ 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))
> +		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.
> +	 */
> +	if (hsr_is_node_in_db(&hsr->proxy_node_db,
> +			      payload->macaddress_A))
> +		return true;
> +
> +	return false;

return hsr_is_node_in_db();

> +}
> +
>  static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
>  					       struct hsr_frame_info *frame)
>  {
> @@ -499,7 +531,8 @@ 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 +670,9 @@ 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 +724,7 @@ 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..8d2a5e8adf83 100644
> --- a/net/hsr/hsr_framereg.c
> +++ b/net/hsr/hsr_framereg.c
> @@ -36,6 +36,17 @@ 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;
> +
> +	if (ether_addr_equal(addr, hsr->macaddress_redbox))
> +		return true;
> +
> +	return false;

You could just return ether_addr_equal here

> +}
> +
>  bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
>  {
>  	struct hsr_self_node *sn;
> @@ -591,6 +602,10 @@ 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);