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all: declare & plumb IPv6 masquerade address for peer

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This PR plumbs through awareness of an IPv6 SNAT/masquerade address from the wire protocol
through to the low-level (tstun / wgengine). This PR is the first in two PRs for implementing
IPv6 NAT support to/from peers.

A subsequent PR will implement the data-plane changes to implement IPv6 NAT - this is just plumbing.

Signed-off-by: Tom DNetto <tom@tailscale.com>
Updates ENG-991
This commit is contained in:
Tom DNetto
2023-09-18 17:03:53 -07:00
committed by Tom
parent d9ae7d670e
commit c08cf2a9c6
13 changed files with 81 additions and 9 deletions
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wgengine/wgcfg/config.go
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@@ -38,6 +38,7 @@ type Peer struct {
DiscoKey key.DiscoPublic // present only so we can handle restarts within wgengine, not passed to WireGuard
AllowedIPs []netip.Prefix
V4MasqAddr *netip.Addr // if non-nil, masquerade IPv4 traffic to this peer using this address
V6MasqAddr *netip.Addr // if non-nil, masquerade IPv6 traffic to this peer using this address
PersistentKeepalive uint16
// wireguard-go's endpoint for this peer. It should always equal Peer.PublicKey.
// We represent it explicitly so that we can detect if they diverge and recover.