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  +   €l–Ь4э( ©і( 	ЕЂfаB¦-яї„Ђ _†I|ҐЏ+ДГ .а    /* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _NET_IPV6_GRO_H
#define _NET_IPV6_GRO_H

#include <linux/indirect_call_wrapper.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/ip6_checksum.h>
#include <linux/skbuff.h>
#include <net/udp.h>

struct napi_gro_cb {
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void	*frag0;

	/* Length of frag0. */
	unsigned int frag0_len;

	/* This indicates where we are processing relative to skb->data. */
	int	data_offset;

	/* This is non-zero if the packet cannot be merged with the new skb. */
	u16	flush;

	/* Save the IP ID here and check when we get to the transport layer */
	u16	flush_id;

	/* Number of segments aggregated. */
	u16	count;

	/* Start offset for remote checksum offload */
	u16	gro_remcsum_start;

	/* jiffies when first packet was created/queued */
	unsigned long age;

	/* Used in ipv6_gro_receive() and foo-over-udp */
	u16	proto;

	/* This is non-zero if the packet may be of the same flow. */
	u8	same_flow:1;

	/* Used in tunnel GRO receive */
	u8	encap_mark:1;

	/* GRO checksum is valid */
	u8	csum_valid:1;

	/* Number of checksums via CHECKSUM_UNNECESSARY */
	u8	csum_cnt:3;

	/* Free the skb? */
	u8	free:2;
#define NAPI_GRO_FREE		  1
#define NAPI_GRO_FREE_STOLEN_HEAD 2

	/* Used in foo-over-udp, set in udp[46]_gro_receive */
	u8	is_ipv6:1;

	/* Used in GRE, set in fou/gue_gro_receive */
	u8	is_fou:1;

	/* Used to determine if flush_id can be ignored */
	u8	is_atomic:1;

	/* Number of gro_receive callbacks this packet already went through */
	u8 recursion_counter:4;

	/* GRO is done by frag_list pointer chaining. */
	u8	is_flist:1;

	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
	__wsum	csum;

	/* used in skb_gro_receive() slow path */
	struct sk_buff *last;
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)

#define GRO_RECURSION_LIMIT 15
static inline int gro_recursion_inc_test(struct sk_buff *skb)
{
	return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;
}

typedef struct sk_buff *(*gro_receive_t)(struct list_head *, struct sk_buff *);
static inline struct sk_buff *call_gro_receive(gro_receive_t cb,
					       struct list_head *head,
					       struct sk_buff *skb)
{
	if (unlikely(gro_recursion_inc_test(skb))) {
		NAPI_GRO_CB(skb)->flush |= 1;
		return NULL;
	}

	return cb(head, skb);
}

typedef struct sk_buff *(*gro_receive_sk_t)(struct sock *, struct list_head *,
					    struct sk_buff *);
static inline struct sk_buff *call_gro_receive_sk(gro_receive_sk_t cb,
						  struct sock *sk,
						  struct list_head *head,
						  struct sk_buff *skb)
{
	if (unlikely(gro_recursion_inc_test(skb))) {
		NAPI_GRO_CB(skb)->flush |= 1;
		return NULL;
	}

	return cb(sk, head, skb);
}

static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
{
	return NAPI_GRO_CB(skb)->data_offset;
}

static inline unsigned int skb_gro_len(const struct sk_buff *skb)
{
	return skb->len - NAPI_GRO_CB(skb)->data_offset;
}

static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
{
	NAPI_GRO_CB(skb)->data_offset += len;
}

static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
{
	return NAPI_GRO_CB(skb)->frag0 + offset;
}

static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}

static inline void skb_gro_frag0_invalidate(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
}

static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
	if (!pskb_may_pull(skb, hlen))
		return NULL;

	skb_gro_frag0_invalidate(skb);
	return skb->data + offset;
}

static inline void *skb_gro_header(struct sk_buff *skb,
					unsigned int hlen, unsigned int offset)
{
	void *ptr;

	ptr = skb_gro_header_fast(skb, offset);
	if (skb_gro_header_hard(skb, hlen))
		ptr = skb_gro_header_slow(skb, hlen, offset);
	return ptr;
}

static inline void *skb_gro_network_he