Broadly, this change:
* Enables sockets to be created via `socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)`.
* Passes the network-layer (IP) header up the stack to the transport endpoint,
which can pass it up to the socket layer. This allows a raw socket to return
the entire IP packet to users.
* Adds functions to stack.TransportProtocol, stack.Stack, stack.transportDemuxer
that enable incoming packets to be delivered to raw endpoints. New raw sockets
of other protocols (not ICMP) just need to register with the stack.
* Enables ping.endpoint to return IP headers when created via SOCK_RAW.
PiperOrigin-RevId: 235993280
Change-Id: I60ed994f5ff18b2cbd79f063a7fdf15d093d845a
Also exposes ipv4.MaxTotalSize since it is a generally useful constant.
PiperOrigin-RevId: 235799755
Change-Id: I1fa8d5294bf355acf5527cfdf274b3687d3c8b13
This field was added in the intial implementation, before Route existed
to pass the local and remote addresses to the packet-writing path.
Today, the Route's members should be respected. A similar bug was
previously fixed in 214650822.
PiperOrigin-RevId: 219474095
Change-Id: Id2a8ee4421d2841c8d88ccb3c193c455086350ee
Makes it possible to avoid copying or allocating in cases where DeliverNetworkPacket (rx)
needs to turn around and call WritePacket (tx) with its VectorisedView.
Also removes the restriction on having VectorisedViews with multiple views in the write path.
PiperOrigin-RevId: 211728717
Change-Id: Ie03a65ecb4e28bd15ebdb9c69f05eced18fdfcff
This CL does NDP link-address discovery for IPv6.
It includes several small changes necessary to get linux to talk to
this implementation. In particular, a hop limit of 255 is necessary
for ICMPv6.
PiperOrigin-RevId: 211103930
Change-Id: If25370ab84c6b1decfb15de917f3b0020f2c4e0e
Kevin Krakauer
Googler
Tamir Duberstein
Ian Gudger
Bert Muthalaly
Bhasker Hariharan
Nicolas Lacasse