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net_util: add support for IPv6 addresses on tap interfaces

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Allow tap interfaces to be configured with an IPv6 address. The change
is fairly straightforward: we need to update the API types and CLI
parsing to accept either an IPv6 or IPv4 and then match on the IP
address type when the tap device is configured.

For IPv6 addresses, the netmask (prefix) must be provided at the same
time as the address itself (in the SIOCSIFADDR ioctl). They cannot be
configured separately. So we remove the separate "set_netmask" function
and convert "set_ip_addr" to also accept a netmask. For IPv4 addresses,
the IP address and netmask were already always set together, so this
should have no functional impact for users of IPv4 addresses.

Signed-off-by: Gregory Anders <ganders@cloudflare.com>
This commit is contained in:
Gregory Anders
2025-05-02 13:04:53 -05:00
committed by Rob Bradford
parent 1454d39b28
commit dce82a34d0
12 changed files with 219 additions and 66 deletions
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4
net_gen/src/lib.rs
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@@ -26,6 +26,9 @@ pub mod if_tun;
// --constified-enum '*' --with-derive-default
// Name is "inn" to avoid conflicting with "in" keyword.
pub mod inn;
// generated with bindgen /usr/include/linux/ipv6.h --no-layout-tests --constified-enum '*'
// --allowlist-type 'sockaddr_in6|in6_ifreq'
pub mod ipv6;
// generated with bindgen /usr/include/linux/sockios.h --no-unstable-rust
// --constified-enum '*' --with-derive-default
pub mod sockios;
@@ -35,6 +38,7 @@ pub use if_tun::{
};
pub use iff::{ifreq, net_device_flags_IFF_UP, setsockopt, sockaddr, AF_INET};
pub use inn::sockaddr_in;
pub use ipv6::{in6_ifreq, sockaddr_in6};
pub const TUNTAP: ::std::os::raw::c_uint = 84;