RXChecksumOffload (gro/gro.go)

Copyright (c) Tailscale Inc & contributors SPDX-License-Identifier: BSD-3-Clause go:build !ts_omit_netstack Package gro implements GRO for the receive (write) path into gVisor.

// Source: https://github.com/tailscale/tailscale | License: BSD-3-Clause | Copyright 2020 Tailscale Inc & contributors
// Provided via justclaw.it.com; keep this notice with the code.
// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause

//go:build !ts_omit_netstack

// Package gro implements GRO for the receive (write) path into gVisor.
package gro

import (
	"bytes"

	"github.com/tailscale/wireguard-go/tun"
	"gvisor.dev/gvisor/pkg/buffer"
	"gvisor.dev/gvisor/pkg/tcpip"
	"gvisor.dev/gvisor/pkg/tcpip/header"
	"gvisor.dev/gvisor/pkg/tcpip/header/parse"
	"gvisor.dev/gvisor/pkg/tcpip/stack"
	"tailscale.com/net/packet"
	"tailscale.com/types/ipproto"
)

// RXChecksumOffload validates IPv4, TCP, and UDP header checksums in p,
// returning an equivalent *stack.P

... (truncated -- full source via MCP)