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net: support IPv6 in the host netdev and TCP/UDP plumbing #60

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Merged
deadprogram merged 2 commits into from
Aug 20, 2026
Merged

net: support IPv6 in the host netdev and TCP/UDP plumbing #60

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5cf1b95
net: add default host netdev backed by raw Linux syscalls
0pcom Jun 23, 2026
11a72b4
net: support IPv6 in the host netdev and TCP/UDP plumbing
0pcom Jun 23, 2026
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15 changes: 9 additions & 6 deletions dial.go
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Original file line number Diff line number Diff line change
Expand Up @@ -101,8 +101,11 @@ type Dialer struct {
// See Go "net" package Dial() for more information.
//
// Note: Tinygo Dial supports a subset of networks supported by Go Dial,
// specifically: "tcp", "tcp4", "udp", and "udp4". IP and unix networks are
// not supported.
// specifically: "tcp", "tcp4", "tcp6", "udp", "udp4", and "udp6". IP and unix
// networks are not supported. IPv6 addresses are supported, but when dialing a
// host name the resolver prefers an IPv4 (A) address and only falls back to
// IPv6 (AAAA), so the "4"/"6" suffix does not force the address family for name
// resolution.
func Dial(network, address string) (Conn, error) {
var d Dialer
return d.Dial(network, address)
Expand Down Expand Up @@ -157,13 +160,13 @@ func (d *Dialer) DialContext(ctx context.Context, network, address string) (Conn
// TINYGO: Ignoring context

switch network {
case "tcp", "tcp4":
case "tcp", "tcp4", "tcp6":
raddr, err := ResolveTCPAddr(network, address)
if err != nil {
return nil, err
}
return DialTCP(network, nil, raddr)
case "udp", "udp4":
case "udp", "udp4", "udp6":
raddr, err := ResolveUDPAddr(network, address)
if err != nil {
return nil, err
Expand Down Expand Up @@ -271,12 +274,12 @@ func parseNetwork(ctx context.Context, network string, needsProto bool) (afnet s
// See Go "net" package Listen() for more information.
//
// Note: Tinygo Listen supports a subset of networks supported by Go Listen,
// specifically: "tcp", "tcp4". "tcp6" and unix networks are not supported.
// specifically: "tcp", "tcp4", and "tcp6". unix networks are not supported.
func Listen(network, address string) (Listener, error) {

// println("Listen", address)
switch network {
case "tcp", "tcp4":
case "tcp", "tcp4", "tcp6":
default:
return nil, fmt.Errorf("Network %s not supported", network)
}
Expand Down
11 changes: 11 additions & 0 deletions netdev.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (

const (
_AF_INET = 0x2
_AF_INET6 = 0xa
_SOCK_STREAM = 0x1
_SOCK_DGRAM = 0x2
_SOL_SOCKET = 0x1
Expand All @@ -36,6 +37,16 @@ func useNetdev(dev netdever) {
netdev = dev
}

// socketFamily returns the address family (_AF_INET or _AF_INET6) to use for a
// socket targeting ip. A nil/zero-length IP (e.g. a wildcard listen address)
// defaults to IPv4.
func socketFamily(ip IP) int {
if len(ip) == 16 && ip.To4() == nil {
return _AF_INET6
}
return _AF_INET
}

// netdever is TinyGo's OSI L3/L4 network/transport layer interface. Network
// drivers implement the netdever interface, providing a common network L3/L4
// interface to TinyGo's "net" package. net.Conn implementations (TCPConn,
Expand Down
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