[linux-block.git] / net / hsr / hsr_forward.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 */

#include "hsr_forward.h"
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include "hsr_main.h"
#include "hsr_framereg.h"

struct hsr_node;

struct hsr_frame_info {
	struct sk_buff *skb_std;
	struct sk_buff *skb_hsr;
	struct hsr_port *port_rcv;
	struct hsr_node *node_src;
	u16 sequence_nr;
	bool is_supervision;
	bool is_vlan;
	bool is_local_dest;
	bool is_local_exclusive;
};

/* The uses I can see for these HSR supervision frames are:
 * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
 *    22") to reset any sequence_nr counters belonging to that node. Useful if
 *    the other node's counter has been reset for some reason.
 *    --
 *    Or not - resetting the counter and bridging the frame would create a
 *    loop, unfortunately.
 *
 * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
 *    frame is received from a particular node, we know something is wrong.
 *    We just register these (as with normal frames) and throw them away.
 *
 * 3) Allow different MAC addresses for the two slave interfaces, using the
 *    MacAddressA field.
 */
static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
{
	struct ethhdr *eth_hdr;
	struct hsr_sup_tag *hsr_sup_tag;
	struct hsrv1_ethhdr_sp *hsr_V1_hdr;

	WARN_ON_ONCE(!skb_mac_header_was_set(skb));
	eth_hdr = (struct ethhdr *)skb_mac_header(skb);

	/* Correct addr? */
	if (!ether_addr_equal(eth_hdr->h_dest,
			      hsr->sup_multicast_addr))
		return false;

	/* Correct ether type?. */
	if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
	      eth_hdr->h_proto == htons(ETH_P_HSR)))
		return false;

	/* Get the supervision header from correct location. */
	if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
		hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
		if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
			return false;

		hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
	} else {
		hsr_sup_tag =
		     &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
	}

	if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
	    hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK)
		return false;
	if (hsr_sup_tag->HSR_TLV_length != 12 &&
	    hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))
		return false;

	return true;
}

static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
					   struct hsr_frame_info *frame)
{
	struct sk_buff *skb;
	int copylen;
	unsigned char *dst, *src;

	skb_pull(skb_in, HSR_HLEN);
	skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
	skb_push(skb_in, HSR_HLEN);
	if (!skb)
		return NULL;

	skb_reset_mac_header(skb);

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		skb->csum_start -= HSR_HLEN;

	copylen = 2 * ETH_ALEN;
	if (frame->is_vlan)
		copylen += VLAN_HLEN;
	src = skb_mac_header(skb_in);
	dst = skb_mac_header(skb);
	memcpy(dst, src, copylen);

	skb->protocol = eth_hdr(skb)->h_proto;
	return skb;
}

static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
					      struct hsr_port *port)
{
	if (!frame->skb_std)
		frame->skb_std = create_stripped_skb(frame->skb_hsr, frame);
	return skb_clone(frame->skb_std, GFP_ATOMIC);
}

static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
			 struct hsr_port *port, u8 proto_version)
{
	struct hsr_ethhdr *hsr_ethhdr;
	int lane_id;
	int lsdu_size;

	if (port->type == HSR_PT_SLAVE_A)
		lane_id = 0;
	else
		lane_id = 1;

	lsdu_size = skb->len - 14;
	if (frame->is_vlan)
		lsdu_size -= 4;

	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);

	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);
	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
	hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
			ETH_P_HSR : ETH_P_PRP);
}

static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
					 struct hsr_frame_info *frame,
					 struct hsr_port *port)
{
	int movelen;
	unsigned char *dst, *src;
	struct sk_buff *skb;

	/* Create the new skb with enough headroom to fit the HSR tag */
	skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC);
	if (!skb)
		return NULL;
	skb_reset_mac_header(skb);

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		skb->csum_start += HSR_HLEN;

	movelen = ETH_HLEN;
	if (frame->is_vlan)
		movelen += VLAN_HLEN;

	src = skb_mac_header(skb);
	dst = skb_push(skb, HSR_HLEN);
	memmove(dst, src, movelen);
	skb_reset_mac_header(skb);

	hsr_fill_tag(skb, frame, port, port->hsr->prot_version);

	return skb;
}

/* If the original frame was an HSR tagged frame, just clone it to be sent
 * unchanged. Otherwise, create a private frame especially tagged for 'port'.
 */
static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,
					    struct hsr_port *port)
{
	if (frame->skb_hsr)
		return skb_clone(frame->skb_hsr, GFP_ATOMIC);

	if (port->type != HSR_PT_SLAVE_A && port->type != HSR_PT_SLAVE_B) {
		WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");
		return NULL;
	}

	return create_tagged_skb(frame->skb_std, frame, port);
}

static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
			       struct hsr_node *node_src)
{
	bool was_multicast_frame;
	int res;

	was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
	hsr_addr_subst_source(node_src, skb);
	skb_pull(skb, ETH_HLEN);
	res = netif_rx(skb);
	if (res == NET_RX_DROP) {
		dev->stats.rx_dropped++;
	} else {
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += skb->len;
		if (was_multicast_frame)
			dev->stats.multicast++;
	}
}

static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
		    struct hsr_frame_info *frame)
{
	if (frame->port_rcv->type == HSR_PT_MASTER) {
		hsr_addr_subst_dest(frame->node_src, skb, port);

		/* Address substitution (IEC62439-3 pp 26, 50): replace mac
		 * address of outgoing frame with that of the outgoing slave's.
		 */
		ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
	}
	return dev_queue_xmit(skb);
}

/* Forward the frame through all devices except:
 * - Back through the receiving device
 * - If it's a HSR frame: through a device where it has passed before
 * - To the local HSR master only if the frame is directly addressed to it, or
 *   a non-supervision multicast or broadcast frame.
 *
 * HSR slave devices should insert a HSR tag into the frame, or forward the
 * frame unchanged if it's already tagged. Interlink devices should strip HSR
 * tags if they're of the non-HSR type (but only after duplicate discard). The
 * master device always strips HSR tags.
 */
static void hsr_forward_do(struct hsr_frame_info *frame)
{
	struct hsr_port *port;
	struct sk_buff *skb;

	hsr_for_each_port(frame->port_rcv->hsr, port) {
		/* Don't send frame back the way it came */
		if (port == frame->port_rcv)
			continue;

		/* Don't deliver locally unless we should */
		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
			continue;

		/* Deliver frames directly addressed to us to master only */
		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
			continue;

		/* Don't send frame over port where it has been sent before */
		if (hsr_register_frame_out(port, frame->node_src,
					   frame->sequence_nr))
			continue;

		if (frame->is_supervision && port->type == HSR_PT_MASTER) {
			hsr_handle_sup_frame(frame->skb_hsr,
					     frame->node_src,
					     frame->port_rcv);
			continue;
		}

		if (port->type != HSR_PT_MASTER)
			skb = frame_get_tagged_skb(frame, port);
		else
			skb = frame_get_stripped_skb(frame, port);
		if (!skb) {
			/* FIXME: Record the dropped frame? */
			continue;
		}

		skb->dev = port->dev;
		if (port->type == HSR_PT_MASTER)
			hsr_deliver_master(skb, port->dev, frame->node_src);
		else
			hsr_xmit(skb, port, frame);
	}
}

static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
			     struct hsr_frame_info *frame)
{
	if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
		frame->is_local_exclusive = true;
		skb->pkt_type = PACKET_HOST;
	} else {
		frame->is_local_exclusive = false;
	}

	if (skb->pkt_type == PACKET_HOST ||
	    skb->pkt_type == PACKET_MULTICAST ||
	    skb->pkt_type == PACKET_BROADCAST) {
		frame->is_local_dest = true;
	} else {
		frame->is_local_dest = false;
	}
}

static int hsr_fill_frame_info(struct hsr_frame_info *frame,
			       struct sk_buff *skb, struct hsr_port *port)
{
	struct ethhdr *ethhdr;
	unsigned long irqflags;

	frame->is_supervision = is_supervision_frame(port->hsr, skb);
	frame->node_src = hsr_get_node(port, skb, frame->is_supervision);
	if (!frame->node_src)
		return -1; /* Unknown node and !is_supervision, or no mem */

	ethhdr = (struct ethhdr *)skb_mac_header(skb);
	frame->is_vlan = false;
	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
		frame->is_vlan = true;
		/* FIXME: */
		WARN_ONCE(1, "HSR: VLAN not yet supported");
	}
	if (ethhdr->h_proto == htons(ETH_P_PRP) ||
	    ethhdr->h_proto == htons(ETH_P_HSR)) {
		frame->skb_std = NULL;
		frame->skb_hsr = skb;
		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
	} else {
		frame->skb_std = skb;
		frame->skb_hsr = NULL;
		/* Sequence nr for the master node */
		spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags);
		frame->sequence_nr = port->hsr->sequence_nr;
		port->hsr->sequence_nr++;
		spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags);
	}

	frame->port_rcv = port;
	check_local_dest(port->hsr, skb, frame);

	return 0;
}

/* Must be called holding rcu read lock (because of the port parameter) */
void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
{
	struct hsr_frame_info frame;

	if (skb_mac_header(skb) != skb->data) {
		WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",
			  __FILE__, __LINE__, port->dev->name);
		goto out_drop;
	}

	if (hsr_fill_frame_info(&frame, skb, port) < 0)
		goto out_drop;
	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
	hsr_forward_do(&frame);
	/* 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) {
		port->dev->stats.tx_packets++;
		port->dev->stats.tx_bytes += skb->len;
	}

	if (frame.skb_hsr)
		kfree_skb(frame.skb_hsr);
	if (frame.skb_std)
		kfree_skb(frame.skb_std);
	return;

out_drop:
	port->dev->stats.tx_dropped++;
	kfree_skb(skb);
}
Commit	Line	Data
0e7623bd	1	// SPDX-License-Identifier: GPL-2.0
f266a683	2	/* Copyright 2011-2014 Autronica Fire and Security AS
f266a683 AB	3	*
	4	* Author(s):
	5	* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
	6	*/
	7
	8	#include "hsr_forward.h"
	9	#include <linux/types.h>
	10	#include <linux/skbuff.h>
	11	#include <linux/etherdevice.h>
	12	#include <linux/if_vlan.h>
	13	#include "hsr_main.h"
	14	#include "hsr_framereg.h"
	15
f266a683 AB	16	struct hsr_node;
	17
	18	struct hsr_frame_info {
	19	struct sk_buff *skb_std;
	20	struct sk_buff *skb_hsr;
	21	struct hsr_port *port_rcv;
	22	struct hsr_node *node_src;
	23	u16 sequence_nr;
	24	bool is_supervision;
	25	bool is_vlan;
	26	bool is_local_dest;
	27	bool is_local_exclusive;
	28	};
	29
f266a683 AB	30	/* The uses I can see for these HSR supervision frames are:
	31	* 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
	32	* 22") to reset any sequence_nr counters belonging to that node. Useful if
	33	* the other node's counter has been reset for some reason.
	34	* --
	35	* Or not - resetting the counter and bridging the frame would create a
	36	* loop, unfortunately.
	37	*
	38	* 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
	39	* frame is received from a particular node, we know something is wrong.
	40	* We just register these (as with normal frames) and throw them away.
	41	*
	42	* 3) Allow different MAC addresses for the two slave interfaces, using the
	43	* MacAddressA field.
	44	*/
	45	static bool is_supervision_frame(struct hsr_priv hsr, struct sk_buff skb)
	46	{
b1b4aa91 MK	47	struct ethhdr *eth_hdr;
	48	struct hsr_sup_tag *hsr_sup_tag;
	49	struct hsrv1_ethhdr_sp *hsr_V1_hdr;
f266a683 AB	50
f266a683 AB	51	WARN_ON_ONCE(!skb_mac_header_was_set(skb));
b1b4aa91	52	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
f266a683	53
ee1c2797	54	/* Correct addr? */
b1b4aa91	55	if (!ether_addr_equal(eth_hdr->h_dest,
f266a683 AB	56	hsr->sup_multicast_addr))
	57	return false;
	58
ee1c2797	59	/* Correct ether type?. */
b1b4aa91 MK	60	if (!(eth_hdr->h_proto == htons(ETH_P_PRP) \|\|
b1b4aa91 MK	61	eth_hdr->h_proto == htons(ETH_P_HSR)))
f266a683	62	return false;
ee1c2797 PH	63
ee1c2797 PH	64	/* Get the supervision header from correct location. */
b1b4aa91 MK	65	if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
	66	hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
	67	if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
ee1c2797 PH	68	return false;
ee1c2797 PH	69
b1b4aa91	70	hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
ee1c2797	71	} else {
b1b4aa91	72	hsr_sup_tag =
5fa96778	73	&((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
ee1c2797 PH	74	}
ee1c2797 PH	75
b1b4aa91 MK	76	if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
b1b4aa91 MK	77	hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK)
f266a683	78	return false;
b1b4aa91 MK	79	if (hsr_sup_tag->HSR_TLV_length != 12 &&
b1b4aa91 MK	80	hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))
f266a683 AB	81	return false;
	82
	83	return true;
	84	}
	85
f266a683 AB	86	static struct sk_buff create_stripped_skb(struct sk_buff skb_in,
	87	struct hsr_frame_info *frame)
	88	{
	89	struct sk_buff *skb;
	90	int copylen;
	91	unsigned char dst, src;
	92
	93	skb_pull(skb_in, HSR_HLEN);
	94	skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
	95	skb_push(skb_in, HSR_HLEN);
05ca6e64	96	if (!skb)
f266a683 AB	97	return NULL;
	98
	99	skb_reset_mac_header(skb);
	100
	101	if (skb->ip_summed == CHECKSUM_PARTIAL)
	102	skb->csum_start -= HSR_HLEN;
	103
d131fcc6	104	copylen = 2 * ETH_ALEN;
f266a683 AB	105	if (frame->is_vlan)
	106	copylen += VLAN_HLEN;
	107	src = skb_mac_header(skb_in);
	108	dst = skb_mac_header(skb);
	109	memcpy(dst, src, copylen);
	110
	111	skb->protocol = eth_hdr(skb)->h_proto;
	112	return skb;
	113	}
	114
	115	static struct sk_buff frame_get_stripped_skb(struct hsr_frame_info frame,
	116	struct hsr_port *port)
	117	{
	118	if (!frame->skb_std)
	119	frame->skb_std = create_stripped_skb(frame->skb_hsr, frame);
	120	return skb_clone(frame->skb_std, GFP_ATOMIC);
	121	}
	122
f266a683	123	static void hsr_fill_tag(struct sk_buff skb, struct hsr_frame_info frame,
b1b4aa91	124	struct hsr_port *port, u8 proto_version)
f266a683 AB	125	{
	126	struct hsr_ethhdr *hsr_ethhdr;
	127	int lane_id;
	128	int lsdu_size;
	129
	130	if (port->type == HSR_PT_SLAVE_A)
	131	lane_id = 0;
	132	else
	133	lane_id = 1;
	134
	135	lsdu_size = skb->len - 14;
	136	if (frame->is_vlan)
	137	lsdu_size -= 4;
	138
5fa96778	139	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
f266a683 AB	140
	141	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);
	142	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
	143	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
	144	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
b1b4aa91	145	hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
ee1c2797	146	ETH_P_HSR : ETH_P_PRP);
f266a683 AB	147	}
	148
	149	static struct sk_buff create_tagged_skb(struct sk_buff skb_o,
	150	struct hsr_frame_info *frame,
	151	struct hsr_port *port)
	152	{
	153	int movelen;
	154	unsigned char dst, src;
	155	struct sk_buff *skb;
	156
	157	/* Create the new skb with enough headroom to fit the HSR tag */
	158	skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC);
05ca6e64	159	if (!skb)
f266a683 AB	160	return NULL;
	161	skb_reset_mac_header(skb);
	162
	163	if (skb->ip_summed == CHECKSUM_PARTIAL)
	164	skb->csum_start += HSR_HLEN;
	165
	166	movelen = ETH_HLEN;
	167	if (frame->is_vlan)
	168	movelen += VLAN_HLEN;
	169
	170	src = skb_mac_header(skb);
	171	dst = skb_push(skb, HSR_HLEN);
	172	memmove(dst, src, movelen);
	173	skb_reset_mac_header(skb);
	174
b1b4aa91	175	hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
f266a683 AB	176
	177	return skb;
	178	}
	179
	180	/* If the original frame was an HSR tagged frame, just clone it to be sent
	181	* unchanged. Otherwise, create a private frame especially tagged for 'port'.
	182	*/
	183	static struct sk_buff frame_get_tagged_skb(struct hsr_frame_info frame,
	184	struct hsr_port *port)
	185	{
	186	if (frame->skb_hsr)
	187	return skb_clone(frame->skb_hsr, GFP_ATOMIC);
	188
5670342c	189	if (port->type != HSR_PT_SLAVE_A && port->type != HSR_PT_SLAVE_B) {
f266a683 AB	190	WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");
	191	return NULL;
	192	}
	193
	194	return create_tagged_skb(frame->skb_std, frame, port);
	195	}
	196
f266a683 AB	197	static void hsr_deliver_master(struct sk_buff skb, struct net_device dev,
	198	struct hsr_node *node_src)
	199	{
	200	bool was_multicast_frame;
	201	int res;
	202
	203	was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
	204	hsr_addr_subst_source(node_src, skb);
	205	skb_pull(skb, ETH_HLEN);
	206	res = netif_rx(skb);
	207	if (res == NET_RX_DROP) {
	208	dev->stats.rx_dropped++;
	209	} else {
	210	dev->stats.rx_packets++;
	211	dev->stats.rx_bytes += skb->len;
	212	if (was_multicast_frame)
	213	dev->stats.multicast++;
	214	}
	215	}
	216
	217	static int hsr_xmit(struct sk_buff skb, struct hsr_port port,
	218	struct hsr_frame_info *frame)
	219	{
	220	if (frame->port_rcv->type == HSR_PT_MASTER) {
	221	hsr_addr_subst_dest(frame->node_src, skb, port);
	222
	223	/* Address substitution (IEC62439-3 pp 26, 50): replace mac
	224	* address of outgoing frame with that of the outgoing slave's.
	225	*/
	226	ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
	227	}
	228	return dev_queue_xmit(skb);
	229	}
	230
f266a683 AB	231	/* Forward the frame through all devices except:
	232	* - Back through the receiving device
	233	* - If it's a HSR frame: through a device where it has passed before
	234	* - To the local HSR master only if the frame is directly addressed to it, or
	235	* a non-supervision multicast or broadcast frame.
	236	*
	237	* HSR slave devices should insert a HSR tag into the frame, or forward the
	238	* frame unchanged if it's already tagged. Interlink devices should strip HSR
	239	* tags if they're of the non-HSR type (but only after duplicate discard). The
	240	* master device always strips HSR tags.
	241	*/
	242	static void hsr_forward_do(struct hsr_frame_info *frame)
	243	{
	244	struct hsr_port *port;
	245	struct sk_buff *skb;
	246
	247	hsr_for_each_port(frame->port_rcv->hsr, port) {
	248	/* Don't send frame back the way it came */
	249	if (port == frame->port_rcv)
	250	continue;
	251
	252	/* Don't deliver locally unless we should */
5670342c	253	if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
f266a683 AB	254	continue;
	255
	256	/* Deliver frames directly addressed to us to master only */
5670342c	257	if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
f266a683 AB	258	continue;
	259
	260	/* Don't send frame over port where it has been sent before */
	261	if (hsr_register_frame_out(port, frame->node_src,
	262	frame->sequence_nr))
	263	continue;
	264
5670342c	265	if (frame->is_supervision && port->type == HSR_PT_MASTER) {
f266a683 AB	266	hsr_handle_sup_frame(frame->skb_hsr,
	267	frame->node_src,
	268	frame->port_rcv);
	269	continue;
	270	}
	271
	272	if (port->type != HSR_PT_MASTER)
	273	skb = frame_get_tagged_skb(frame, port);
	274	else
	275	skb = frame_get_stripped_skb(frame, port);
05ca6e64	276	if (!skb) {
f266a683 AB	277	/* FIXME: Record the dropped frame? */
	278	continue;
	279	}
	280
	281	skb->dev = port->dev;
	282	if (port->type == HSR_PT_MASTER)
	283	hsr_deliver_master(skb, port->dev, frame->node_src);
	284	else
	285	hsr_xmit(skb, port, frame);
	286	}
	287	}
	288
f266a683 AB	289	static void check_local_dest(struct hsr_priv hsr, struct sk_buff skb,
	290	struct hsr_frame_info *frame)
	291	{
f266a683 AB	292	if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
	293	frame->is_local_exclusive = true;
	294	skb->pkt_type = PACKET_HOST;
	295	} else {
	296	frame->is_local_exclusive = false;
	297	}
	298
5670342c MK	299	if (skb->pkt_type == PACKET_HOST \|\|
	300	skb->pkt_type == PACKET_MULTICAST \|\|
	301	skb->pkt_type == PACKET_BROADCAST) {
f266a683 AB	302	frame->is_local_dest = true;
	303	} else {
	304	frame->is_local_dest = false;
	305	}
	306	}
	307
f266a683 AB	308	static int hsr_fill_frame_info(struct hsr_frame_info *frame,
	309	struct sk_buff skb, struct hsr_port port)
	310	{
	311	struct ethhdr *ethhdr;
	312	unsigned long irqflags;
	313
	314	frame->is_supervision = is_supervision_frame(port->hsr, skb);
675c8da0	315	frame->node_src = hsr_get_node(port, skb, frame->is_supervision);
05ca6e64	316	if (!frame->node_src)
f266a683 AB	317	return -1; /* Unknown node and !is_supervision, or no mem */
f266a683 AB	318
5fa96778	319	ethhdr = (struct ethhdr *)skb_mac_header(skb);
f266a683 AB	320	frame->is_vlan = false;
	321	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
	322	frame->is_vlan = true;
	323	/* FIXME: */
	324	WARN_ONCE(1, "HSR: VLAN not yet supported");
	325	}
05947783 MK	326	if (ethhdr->h_proto == htons(ETH_P_PRP) \|\|
05947783 MK	327	ethhdr->h_proto == htons(ETH_P_HSR)) {
f266a683 AB	328	frame->skb_std = NULL;
	329	frame->skb_hsr = skb;
	330	frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
	331	} else {
	332	frame->skb_std = skb;
	333	frame->skb_hsr = NULL;
	334	/* Sequence nr for the master node */
	335	spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags);
	336	frame->sequence_nr = port->hsr->sequence_nr;
	337	port->hsr->sequence_nr++;
	338	spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags);
	339	}
	340
	341	frame->port_rcv = port;
	342	check_local_dest(port->hsr, skb, frame);
	343
	344	return 0;
	345	}
	346
	347	/* Must be called holding rcu read lock (because of the port parameter) */
	348	void hsr_forward_skb(struct sk_buff skb, struct hsr_port port)
	349	{
	350	struct hsr_frame_info frame;
	351
	352	if (skb_mac_header(skb) != skb->data) {
	353	WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",
	354	__FILE__, __LINE__, port->dev->name);
	355	goto out_drop;
	356	}
	357
	358	if (hsr_fill_frame_info(&frame, skb, port) < 0)
	359	goto out_drop;
	360	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
	361	hsr_forward_do(&frame);
ee2c46f3 MK	362	/* Gets called for ingress frames as well as egress from master port.
	363	* So check and increment stats for master port only here.
	364	*/
	365	if (port->type == HSR_PT_MASTER) {
	366	port->dev->stats.tx_packets++;
	367	port->dev->stats.tx_bytes += skb->len;
	368	}
f266a683	369
05ca6e64	370	if (frame.skb_hsr)
f266a683	371	kfree_skb(frame.skb_hsr);
05ca6e64	372	if (frame.skb_std)
f266a683 AB	373	kfree_skb(frame.skb_std);
	374	return;
	375
	376	out_drop:
	377	port->dev->stats.tx_dropped++;
	378	kfree_skb(skb);
	379	}