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authorPeter Heise <mail@pheise.de>2016-04-13 13:52:22 +0200
committerDavid S. Miller <davem@davemloft.net>2016-04-15 17:06:48 -0400
commitee1c27977284907d40f7f72c2d078d709f15811f (patch)
tree58c578e321dd8baad0af86ecaf41e6e2f34ddb34
parentMerge branch 'tcp-synflood-perf' (diff)
downloadlinux-dev-ee1c27977284907d40f7f72c2d078d709f15811f.tar.xz
linux-dev-ee1c27977284907d40f7f72c2d078d709f15811f.zip
net/hsr: Added support for HSR v1
This patch adds support for the newer version 1 of the HSR networking standard. Version 0 is still default and the new version has to be selected via iproute2. Main changes are in the supervision frame handling and its ethertype field. Signed-off-by: Peter Heise <peter.heise@airbus.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/uapi/linux/if_ether.h1
-rw-r--r--include/uapi/linux/if_link.h1
-rw-r--r--net/hsr/Kconfig5
-rw-r--r--net/hsr/hsr_device.c80
-rw-r--r--net/hsr/hsr_device.h2
-rw-r--r--net/hsr/hsr_forward.c43
-rw-r--r--net/hsr/hsr_framereg.c30
-rw-r--r--net/hsr/hsr_main.h13
-rw-r--r--net/hsr/hsr_netlink.c10
-rw-r--r--net/hsr/hsr_slave.c4
10 files changed, 126 insertions, 63 deletions
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h
index 4a93051c578c..cec849a239f6 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -92,6 +92,7 @@
#define ETH_P_TDLS 0x890D /* TDLS */
#define ETH_P_FIP 0x8914 /* FCoE Initialization Protocol */
#define ETH_P_80221 0x8917 /* IEEE 802.21 Media Independent Handover Protocol */
+#define ETH_P_HSR 0x892F /* IEC 62439-3 HSRv1 */
#define ETH_P_LOOPBACK 0x9000 /* Ethernet loopback packet, per IEEE 802.3 */
#define ETH_P_QINQ1 0x9100 /* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
#define ETH_P_QINQ2 0x9200 /* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 9427f17d06d6..bb3a90b57199 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -773,6 +773,7 @@ enum {
IFLA_HSR_SLAVE1,
IFLA_HSR_SLAVE2,
IFLA_HSR_MULTICAST_SPEC, /* Last byte of supervision addr */
+ IFLA_HSR_VERSION, /* HSR version */
IFLA_HSR_SUPERVISION_ADDR, /* Supervision frame multicast addr */
IFLA_HSR_SEQ_NR,
__IFLA_HSR_MAX,
diff --git a/net/hsr/Kconfig b/net/hsr/Kconfig
index 0d3d709052ca..4b683fd0abf1 100644
--- a/net/hsr/Kconfig
+++ b/net/hsr/Kconfig
@@ -18,8 +18,9 @@ config HSR
earlier.
This code is a "best effort" to comply with the HSR standard as
- described in IEC 62439-3:2010 (HSRv0), but no compliancy tests have
- been made.
+ described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1),
+ but no compliancy tests have been made. Use iproute2 to select
+ the version you desire.
You need to perform any and all necessary tests yourself before
relying on this code in a safety critical system!
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index c7d1adca30d8..386cbce7bc51 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -90,7 +90,8 @@ static void hsr_check_announce(struct net_device *hsr_dev,
hsr = netdev_priv(hsr_dev);
- if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) {
+ if ((hsr_dev->operstate == IF_OPER_UP)
+ && (old_operstate != IF_OPER_UP)) {
/* Went up */
hsr->announce_count = 0;
hsr->announce_timer.expires = jiffies +
@@ -250,31 +251,22 @@ static const struct header_ops hsr_header_ops = {
.parse = eth_header_parse,
};
-
-/* HSR:2010 supervision frames should be padded so that the whole frame,
- * including headers and FCS, is 64 bytes (without VLAN).
- */
-static int hsr_pad(int size)
-{
- const int min_size = ETH_ZLEN - HSR_HLEN - ETH_HLEN;
-
- if (size >= min_size)
- return size;
- return min_size;
-}
-
-static void send_hsr_supervision_frame(struct hsr_port *master, u8 type)
+static void send_hsr_supervision_frame(struct hsr_port *master,
+ u8 type, u8 hsrVer)
{
struct sk_buff *skb;
int hlen, tlen;
+ struct hsr_tag *hsr_tag;
struct hsr_sup_tag *hsr_stag;
struct hsr_sup_payload *hsr_sp;
unsigned long irqflags;
hlen = LL_RESERVED_SPACE(master->dev);
tlen = master->dev->needed_tailroom;
- skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen,
- GFP_ATOMIC);
+ skb = dev_alloc_skb(
+ sizeof(struct hsr_tag) +
+ sizeof(struct hsr_sup_tag) +
+ sizeof(struct hsr_sup_payload) + hlen + tlen);
if (skb == NULL)
return;
@@ -282,32 +274,48 @@ static void send_hsr_supervision_frame(struct hsr_port *master, u8 type)
skb_reserve(skb, hlen);
skb->dev = master->dev;
- skb->protocol = htons(ETH_P_PRP);
+ skb->protocol = htons(hsrVer ? ETH_P_HSR : ETH_P_PRP);
skb->priority = TC_PRIO_CONTROL;
- if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
+ if (dev_hard_header(skb, skb->dev, (hsrVer ? ETH_P_HSR : ETH_P_PRP),
master->hsr->sup_multicast_addr,
skb->dev->dev_addr, skb->len) <= 0)
goto out;
skb_reset_mac_header(skb);
- hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(*hsr_stag));
+ if (hsrVer > 0) {
+ hsr_tag = (typeof(hsr_tag)) skb_put(skb, sizeof(struct hsr_tag));
+ hsr_tag->encap_proto = htons(ETH_P_PRP);
+ set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE);
+ }
- set_hsr_stag_path(hsr_stag, 0xf);
- set_hsr_stag_HSR_Ver(hsr_stag, 0);
+ hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(struct hsr_sup_tag));
+ set_hsr_stag_path(hsr_stag, (hsrVer ? 0x0 : 0xf));
+ set_hsr_stag_HSR_Ver(hsr_stag, hsrVer);
+ /* From HSRv1 on we have separate supervision sequence numbers. */
spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
- hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
- master->hsr->sequence_nr++;
+ if (hsrVer > 0) {
+ hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr);
+ hsr_tag->sequence_nr = htons(master->hsr->sequence_nr);
+ master->hsr->sup_sequence_nr++;
+ master->hsr->sequence_nr++;
+ } else {
+ hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
+ master->hsr->sequence_nr++;
+ }
spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
hsr_stag->HSR_TLV_Type = type;
- hsr_stag->HSR_TLV_Length = 12;
+ /* TODO: Why 12 in HSRv0? */
+ hsr_stag->HSR_TLV_Length = hsrVer ? sizeof(struct hsr_sup_payload) : 12;
/* Payload: MacAddressA */
- hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp));
+ hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(struct hsr_sup_payload));
ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
+ skb_put_padto(skb, ETH_ZLEN + HSR_HLEN);
+
hsr_forward_skb(skb, master);
return;
@@ -329,19 +337,20 @@ static void hsr_announce(unsigned long data)
rcu_read_lock();
master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
- if (hsr->announce_count < 3) {
- send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE);
+ if (hsr->announce_count < 3 && hsr->protVersion == 0) {
+ send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE,
+ hsr->protVersion);
hsr->announce_count++;
- } else {
- send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK);
- }
- if (hsr->announce_count < 3)
hsr->announce_timer.expires = jiffies +
msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
- else
+ } else {
+ send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK,
+ hsr->protVersion);
+
hsr->announce_timer.expires = jiffies +
msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
+ }
if (is_admin_up(master->dev))
add_timer(&hsr->announce_timer);
@@ -428,7 +437,7 @@ 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)
+ unsigned char multicast_spec, u8 protocol_version)
{
struct hsr_priv *hsr;
struct hsr_port *port;
@@ -450,6 +459,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
spin_lock_init(&hsr->seqnr_lock);
/* Overflow soon to find bugs easier: */
hsr->sequence_nr = HSR_SEQNR_START;
+ hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
init_timer(&hsr->announce_timer);
hsr->announce_timer.function = hsr_announce;
@@ -462,6 +472,8 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
+ hsr->protVersion = protocol_version;
+
/* FIXME: should I modify the value of these?
*
* - hsr_dev->flags - i.e.
diff --git a/net/hsr/hsr_device.h b/net/hsr/hsr_device.h
index 108a5d59d2a6..9975e31bbb82 100644
--- a/net/hsr/hsr_device.h
+++ b/net/hsr/hsr_device.h
@@ -17,7 +17,7 @@
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);
+ unsigned char multicast_spec, u8 protocol_version);
void hsr_check_carrier_and_operstate(struct hsr_priv *hsr);
bool is_hsr_master(struct net_device *dev);
int hsr_get_max_mtu(struct hsr_priv *hsr);
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c
index 7871ed6d3825..5ee1d43f1310 100644
--- a/net/hsr/hsr_forward.c
+++ b/net/hsr/hsr_forward.c
@@ -50,21 +50,40 @@ struct hsr_frame_info {
*/
static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
{
- struct hsr_ethhdr_sp *hdr;
+ struct ethhdr *ethHdr;
+ struct hsr_sup_tag *hsrSupTag;
+ struct hsrv1_ethhdr_sp *hsrV1Hdr;
WARN_ON_ONCE(!skb_mac_header_was_set(skb));
- hdr = (struct hsr_ethhdr_sp *) skb_mac_header(skb);
+ ethHdr = (struct ethhdr *) skb_mac_header(skb);
- if (!ether_addr_equal(hdr->ethhdr.h_dest,
+ /* Correct addr? */
+ if (!ether_addr_equal(ethHdr->h_dest,
hsr->sup_multicast_addr))
return false;
- if (get_hsr_stag_path(&hdr->hsr_sup) != 0x0f)
+ /* Correct ether type?. */
+ if (!(ethHdr->h_proto == htons(ETH_P_PRP)
+ || ethHdr->h_proto == htons(ETH_P_HSR)))
return false;
- if ((hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
- (hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
+
+ /* Get the supervision header from correct location. */
+ if (ethHdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
+ hsrV1Hdr = (struct hsrv1_ethhdr_sp *) skb_mac_header(skb);
+ if (hsrV1Hdr->hsr.encap_proto != htons(ETH_P_PRP))
+ return false;
+
+ hsrSupTag = &hsrV1Hdr->hsr_sup;
+ } else {
+ hsrSupTag = &((struct hsrv0_ethhdr_sp *) skb_mac_header(skb))->hsr_sup;
+ }
+
+ if ((hsrSupTag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
+ (hsrSupTag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
return false;
- if (hdr->hsr_sup.HSR_TLV_Length != 12)
+ if ((hsrSupTag->HSR_TLV_Length != 12) &&
+ (hsrSupTag->HSR_TLV_Length !=
+ sizeof(struct hsr_sup_payload)))
return false;
return true;
@@ -110,7 +129,7 @@ static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
- struct hsr_port *port)
+ struct hsr_port *port, u8 protoVersion)
{
struct hsr_ethhdr *hsr_ethhdr;
int lane_id;
@@ -131,7 +150,8 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
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(ETH_P_PRP);
+ hsr_ethhdr->ethhdr.h_proto = htons(protoVersion ?
+ ETH_P_HSR : ETH_P_PRP);
}
static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
@@ -160,7 +180,7 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
memmove(dst, src, movelen);
skb_reset_mac_header(skb);
- hsr_fill_tag(skb, frame, port);
+ hsr_fill_tag(skb, frame, port, port->hsr->protVersion);
return skb;
}
@@ -320,7 +340,8 @@ static int hsr_fill_frame_info(struct hsr_frame_info *frame,
/* FIXME: */
WARN_ONCE(1, "HSR: VLAN not yet supported");
}
- if (ethhdr->h_proto == htons(ETH_P_PRP)) {
+ 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);
diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index bace124d14ef..7ea925816f79 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -177,17 +177,17 @@ struct hsr_node *hsr_get_node(struct list_head *node_db, struct sk_buff *skb,
return node;
}
- if (!is_sup)
- return NULL; /* Only supervision frame may create node entry */
+ /* Everyone may create a node entry, connected node to a HSR device. */
- if (ethhdr->h_proto == htons(ETH_P_PRP)) {
+ if (ethhdr->h_proto == htons(ETH_P_PRP)
+ || ethhdr->h_proto == htons(ETH_P_HSR)) {
/* Use the existing sequence_nr from the tag as starting point
* for filtering duplicate frames.
*/
seq_out = hsr_get_skb_sequence_nr(skb) - 1;
} else {
WARN_ONCE(1, "%s: Non-HSR frame\n", __func__);
- seq_out = 0;
+ seq_out = HSR_SEQNR_START;
}
return hsr_add_node(node_db, ethhdr->h_source, seq_out);
@@ -200,17 +200,25 @@ struct hsr_node *hsr_get_node(struct list_head *node_db, struct sk_buff *skb,
void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
struct hsr_port *port_rcv)
{
+ struct ethhdr *ethhdr;
struct hsr_node *node_real;
struct hsr_sup_payload *hsr_sp;
struct list_head *node_db;
int i;
- skb_pull(skb, sizeof(struct hsr_ethhdr_sp));
- hsr_sp = (struct hsr_sup_payload *) skb->data;
+ ethhdr = (struct ethhdr *) skb_mac_header(skb);
- if (ether_addr_equal(eth_hdr(skb)->h_source, hsr_sp->MacAddressA))
- /* Not sent from MacAddressB of a PICS_SUBS capable node */
- goto done;
+ /* Leave the ethernet header. */
+ skb_pull(skb, sizeof(struct ethhdr));
+
+ /* And leave the HSR tag. */
+ if (ethhdr->h_proto == htons(ETH_P_HSR))
+ skb_pull(skb, sizeof(struct hsr_tag));
+
+ /* And leave the HSR sup tag. */
+ skb_pull(skb, sizeof(struct hsr_sup_tag));
+
+ hsr_sp = (struct hsr_sup_payload *) skb->data;
/* Merge node_curr (registered on MacAddressB) into node_real */
node_db = &port_rcv->hsr->node_db;
@@ -225,7 +233,7 @@ void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
/* Node has already been merged */
goto done;
- ether_addr_copy(node_real->MacAddressB, eth_hdr(skb)->h_source);
+ ether_addr_copy(node_real->MacAddressB, ethhdr->h_source);
for (i = 0; i < HSR_PT_PORTS; i++) {
if (!node_curr->time_in_stale[i] &&
time_after(node_curr->time_in[i], node_real->time_in[i])) {
@@ -241,7 +249,7 @@ void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
kfree_rcu(node_curr, rcu_head);
done:
- skb_push(skb, sizeof(struct hsr_ethhdr_sp));
+ skb_push(skb, sizeof(struct hsrv1_ethhdr_sp));
}
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 5a9c69962ded..9b9909e89e9e 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -30,6 +30,7 @@
*/
#define MAX_SLAVE_DIFF 3000 /* ms */
#define HSR_SEQNR_START (USHRT_MAX - 1024)
+#define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)
/* How often shall we check for broken ring and remove node entries older than
@@ -58,6 +59,8 @@ struct hsr_tag {
#define HSR_HLEN 6
+#define HSR_V1_SUP_LSDUSIZE 52
+
/* The helper functions below assumes that 'path' occupies the 4 most
* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
* equivalently, the 4 most significant bits of HSR tag byte 14).
@@ -131,8 +134,14 @@ static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver)
set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver);
}
-struct hsr_ethhdr_sp {
+struct hsrv0_ethhdr_sp {
+ struct ethhdr ethhdr;
+ struct hsr_sup_tag hsr_sup;
+} __packed;
+
+struct hsrv1_ethhdr_sp {
struct ethhdr ethhdr;
+ struct hsr_tag hsr;
struct hsr_sup_tag hsr_sup;
} __packed;
@@ -162,6 +171,8 @@ struct hsr_priv {
struct timer_list prune_timer;
int announce_count;
u16 sequence_nr;
+ u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
+ u8 protVersion; /* Indicate if HSRv0 or HSRv1. */
spinlock_t seqnr_lock; /* locking for sequence_nr */
unsigned char sup_multicast_addr[ETH_ALEN];
};
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index a2c7e4c0ac1e..5425d87611fc 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_SLAVE1] = { .type = NLA_U32 },
[IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
[IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
+ [IFLA_HSR_VERSION] = { .type = NLA_U8 },
[IFLA_HSR_SUPERVISION_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN },
[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
};
@@ -35,7 +36,7 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct net_device *link[2];
- unsigned char multicast_spec;
+ unsigned char multicast_spec, hsr_version;
if (!data) {
netdev_info(dev, "HSR: No slave devices specified\n");
@@ -62,7 +63,12 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
else
multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
- return hsr_dev_finalize(dev, link, multicast_spec);
+ if (!data[IFLA_HSR_VERSION])
+ hsr_version = 0;
+ else
+ hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
+
+ return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
}
static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
index 7d37366cc695..f5b60388d02f 100644
--- a/net/hsr/hsr_slave.c
+++ b/net/hsr/hsr_slave.c
@@ -22,6 +22,7 @@ static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct hsr_port *port;
+ u16 protocol;
if (!skb_mac_header_was_set(skb)) {
WARN_ONCE(1, "%s: skb invalid", __func__);
@@ -37,7 +38,8 @@ static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
goto finish_consume;
}
- if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
+ protocol = eth_hdr(skb)->h_proto;
+ if (protocol != htons(ETH_P_PRP) && protocol != htons(ETH_P_HSR))
goto finish_pass;
skb_push(skb, ETH_HLEN);