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net/tstun: add inital support for NAT v4

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This adds support in tstun to utitilize the SelfNodeV4MasqAddrForThisPeer and
perform the necessary modifications to the packet as it passes through tstun.

Currently this only handles ICMP, UDP and TCP traffic.
Subnet routers and Exit Nodes are also unsupported.

Updates tailscale/corp#8020

Co-authored-by: Melanie Warrick <warrick@tailscale.com>
Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali
2022-12-10 01:13:41 +05:00
committed by Maisem Ali
parent 535fad16f8
commit bb31fd7d1c
4 changed files with 384 additions and 7 deletions
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1
wgengine/userspace.go
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@ -1205,6 +1205,7 @@ func (e *userspaceEngine) SetNetworkMap(nm *netmap.NetworkMap) {
e.magicConn.SetNetworkMap(nm)
e.mu.Lock()
e.netMap = nm
e.tundev.SetNetMap(nm)
callbacks := make([]NetworkMapCallback, 0, 4)
for _, fn := range e.networkMapCallbacks {
callbacks = append(callbacks, fn)