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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: Anthony Harivel <anthony.harivel@linutronix.de> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Link: https://lore.kernel.org/r/20220228195856.88187-1-kurt@linutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>
43 lines
1 KiB
C
43 lines
1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_IF_HSR_H_
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#define _LINUX_IF_HSR_H_
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/* used to differentiate various protocols */
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enum hsr_version {
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HSR_V0 = 0,
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HSR_V1,
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PRP_V1,
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};
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/* HSR Tag.
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* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
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* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
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* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
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* encapsulated protocol } instead.
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*
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_tag {
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__be16 path_and_LSDU_size;
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__be16 sequence_nr;
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__be16 encap_proto;
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} __packed;
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#define HSR_HLEN 6
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#if IS_ENABLED(CONFIG_HSR)
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extern bool is_hsr_master(struct net_device *dev);
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extern int hsr_get_version(struct net_device *dev, enum hsr_version *ver);
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#else
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static inline bool is_hsr_master(struct net_device *dev)
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{
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return false;
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}
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static inline int hsr_get_version(struct net_device *dev,
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enum hsr_version *ver)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_HSR */
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#endif /*_LINUX_IF_HSR_H_*/
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