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wgengine/netstack/gro: permit building without GRO

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This only saves ~32KB in the minimal linux/amd64 binary, but it's a
step towards permitting not depending on gvisor for small builds.

Updates #17283

Change-Id: Iae8da5e9465127de354dbcaf25e794a6832d891b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-09-25 13:19:11 -07:00
committed by Brad Fitzpatrick
parent f2b8d37436
commit b3ae1cb0cc
9 changed files with 51 additions and 8 deletions
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3
wgengine/netstack/link_endpoint.go
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@@ -10,6 +10,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"tailscale.com/feature/buildfeatures"
"tailscale.com/net/packet"
"tailscale.com/types/ipproto"
"tailscale.com/wgengine/netstack/gro"
@@ -133,7 +134,7 @@ func newLinkEndpoint(size int, mtu uint32, linkAddr tcpip.LinkAddress, supported
// If gro allocates a *gro.GRO it will have l's stack.NetworkDispatcher set via
// SetDispatcher().
func (l *linkEndpoint) gro(p *packet.Parsed, g *gro.GRO) *gro.GRO {
if l.supportedGRO == groNotSupported || p.IPProto != ipproto.TCP {
if !buildfeatures.HasGRO || l.supportedGRO == groNotSupported || p.IPProto != ipproto.TCP {
// IPv6 may have extension headers preceding a TCP header, but we trade
// for a fast path and assume p cannot be coalesced in such a case.
l.injectInbound(p)