Commit bf08824a authored by Kurt Kanzenbach's avatar Kurt Kanzenbach Committed by Jakub Kicinski
Browse files

flow_dissector: Add support for HSR 



Network drivers such as igb or igc call eth_get_headlen() to determine the
header length for their to be constructed skbs in receive path.

When running HSR on top of these drivers, it results in triggering BUG_ON() in
skb_pull(). The reason is the skb headlen is not sufficient for HSR to work
correctly. skb_pull() notices that.

For instance, eth_get_headlen() returns 14 bytes for TCP traffic over HSR which
is not correct. The problem is, the flow dissection code does not take HSR into
account. Therefore, add support for it.

Reported-by: default avatarAnthony Harivel <anthony.harivel@linutronix.de>
Signed-off-by: default avatarKurt Kanzenbach <kurt@linutronix.de>
Link: https://lore.kernel.org/r/20220228195856.88187-1-kurt@linutronix.de


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 00202885

include/linux/if_hsr.h

+16 −0
Original line number Diff line number Diff line
@@ -9,6 +9,22 @@ enum hsr_version { 
	PRP_V1,

};



/* HSR Tag.

 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,

 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,

 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,

 * encapsulated protocol } instead.

 *

 * Field names as defined in the IEC:2010 standard for HSR.

 */

struct hsr_tag {

	__be16		path_and_LSDU_size;

	__be16		sequence_nr;

	__be16		encap_proto;

} __packed;



#define HSR_HLEN	6



#if IS_ENABLED(CONFIG_HSR)

extern bool is_hsr_master(struct net_device *dev);

extern int hsr_get_version(struct net_device *dev, enum hsr_version *ver);

net/core/flow_dissector.c

+17 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/ppp_defs.h>

#include <linux/stddef.h>

#include <linux/if_ether.h>

#include <linux/if_hsr.h>

#include <linux/mpls.h>

#include <linux/tcp.h>

#include <linux/ptp_classify.h>
@@ -1282,6 +1283,22 @@ bool __skb_flow_dissect(const struct net *net, 
		break;

	}



	case htons(ETH_P_HSR): {

		struct hsr_tag *hdr, _hdr;



		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen,

					   &_hdr);

		if (!hdr) {

			fdret = FLOW_DISSECT_RET_OUT_BAD;

			break;

		}



		proto = hdr->encap_proto;

		nhoff += HSR_HLEN;

		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;

		break;

	}



	default:

		fdret = FLOW_DISSECT_RET_OUT_BAD;

		break;

net/hsr/hsr_main.h

+0 −16
Original line number Diff line number Diff line
@@ -45,22 +45,6 @@ 
/* PRP V1 life redundancy box MAC address */

#define PRP_TLV_REDBOX_MAC		   30



/* HSR Tag.

 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,

 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,

 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,

 * encapsulated protocol } instead.

 *

 * Field names as defined in the IEC:2010 standard for HSR.

 */

struct hsr_tag {

	__be16		path_and_LSDU_size;

	__be16		sequence_nr;

	__be16		encap_proto;

} __packed;



#define HSR_HLEN	6



#define HSR_V1_SUP_LSDUSIZE		52



#define HSR_HSIZE_SHIFT	8