[pve-devel] [PATCH installer 1/1] remove network and broadcast address checks

[Michael Köppl]

Missed some of the original changes, sorry about that.

Superseded-by: https://lore.proxmox.com/pve-devel/20250716104351.46784-1-m.koeppl@proxmox.com

On 7/16/25 12:30, Michael Köppl wrote:
> To avoid artificially limiting what users can do, remove the checks
> that ascertain if a supplied address is a network or broadcast address.
> RFC1812 [0] does not explicitly forbid this, nor does RFC3021.
> 
> [0] https://www.rfc-editor.org/rfc/rfc1812
> [1] https://www.rfc-editor.org/rfc/rfc3021
> 
> Signed-off-by: Michael Köppl <m.koeppl at proxmox.com>
> ---
>  proxmox-auto-installer/tests/parse-answer.rs  |  1 -
>  .../ipv4_and_subnet_addr_is_network.json      |  3 --
>  .../ipv4_and_subnet_addr_is_network.toml      | 18 -----------
>  proxmox-installer-common/src/utils.rs         | 32 -------------------
>  4 files changed, 54 deletions(-)
>  delete mode 100644 proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.json
>  delete mode 100644 proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.toml
> 
> diff --git a/proxmox-auto-installer/tests/parse-answer.rs b/proxmox-auto-installer/tests/parse-answer.rs
> index a354f21..594575a 100644
> --- a/proxmox-auto-installer/tests/parse-answer.rs
> +++ b/proxmox-auto-installer/tests/parse-answer.rs
> @@ -148,7 +148,6 @@ mod tests {
>              duplicate_disk,
>              fqdn_from_dhcp_no_default_domain,
>              fqdn_hostname_only,
> -            ipv4_and_subnet_addr_is_network,
>              ipv4_and_subnet_mask_33,
>              lvm_swapsize_greater_than_hdsize,
>              no_fqdn_from_dhcp,
> diff --git a/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.json b/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.json
> deleted file mode 100644
> index b28699d..0000000
> --- a/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.json
> +++ /dev/null
> @@ -1,3 +0,0 @@
> -{
> -  "parse-error": "error parsing answer.toml: Invalid CIDR: address is a network address"
> -}
> diff --git a/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.toml b/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.toml
> deleted file mode 100644
> index 7a9141b..0000000
> --- a/proxmox-auto-installer/tests/resources/parse_answer_fail/ipv4_and_subnet_addr_is_network.toml
> +++ /dev/null
> @@ -1,18 +0,0 @@
> -[global]
> -keyboard = "de"
> -country = "at"
> -fqdn = "pveauto.testinstall"
> -mailto = "mail at no.invalid"
> -timezone = "Europe/Vienna"
> -root_password = "12345678"
> -
> -[network]
> -source = "from-answer"
> -cidr = "10.10.10.32/27"
> -dns = "10.10.10.1"
> -gateway = "10.10.10.1"
> -filter.ID_NET_NAME = "enp129s0f1np1"
> -
> -[disk-setup]
> -filesystem = "ext4"
> -disk_list = ["sda"]
> diff --git a/proxmox-installer-common/src/utils.rs b/proxmox-installer-common/src/utils.rs
> index 929cc6b..378d259 100644
> --- a/proxmox-installer-common/src/utils.rs
> +++ b/proxmox-installer-common/src/utils.rs
> @@ -16,8 +16,6 @@ pub enum CidrAddressParseError {
>      InvalidAddr(AddrParseError),
>      /// The mask could not be parsed.
>      InvalidMask(Box<dyn Error>),
> -    /// The IP address is a network address.
> -    IsNetworkAddr,
>      /// The IP address is a broadcast address.
>      IsBroadcastAddr,
>  }
> @@ -32,7 +30,6 @@ impl fmt::Display for CidrAddressParseError {
>              }
>              CidrAddressParseError::InvalidAddr(err) => write!(f, "{err}"),
>              CidrAddressParseError::InvalidMask(err) => write!(f, "{err}"),
> -            CidrAddressParseError::IsNetworkAddr => write!(f, "address is a network address"),
>              CidrAddressParseError::IsBroadcastAddr => write!(f, "address is a broadcast address"),
>          }
>      }
> @@ -68,7 +65,6 @@ impl CidrAddress {
>          let addr = addr.into();
>  
>          check_mask_limit(&addr, mask)?;
> -        check_addr_valid_in_subnet(&addr, mask)?;
>  
>          Ok(Self { addr, mask })
>      }
> @@ -109,7 +105,6 @@ impl FromStr for CidrAddress {
>              .map_err(|err| CidrAddressParseError::InvalidMask(Box::new(err)))?;
>  
>          check_mask_limit(&addr, mask)?;
> -        check_addr_valid_in_subnet(&addr, mask)?;
>  
>          Ok(Self { addr, mask })
>      }
> @@ -148,33 +143,6 @@ fn check_mask_limit(addr: &IpAddr, mask: usize) -> Result<(), CidrAddressParseEr
>      };
>  }
>  
> -fn check_addr_valid_in_subnet(addr: &IpAddr, mask: usize) -> Result<(), CidrAddressParseError> {
> -    match &addr {
> -        IpAddr::V4(addr_v4) => {
> -            if mask >= 31 {
> -                return Ok(());
> -            }
> -
> -            let num_host_bits = 32 - mask;
> -            let host_part_mask = (1u32 << num_host_bits) - 1;
> -
> -            let ip_bits = u32::from_be_bytes(addr_v4.octets());
> -
> -            let network_addr = ip_bits & !host_part_mask;
> -            let broadcast_addr = network_addr | host_part_mask;
> -
> -            if ip_bits == network_addr {
> -                Err(CidrAddressParseError::IsNetworkAddr)
> -            } else if ip_bits == broadcast_addr {
> -                Err(CidrAddressParseError::IsBroadcastAddr)
> -            } else {
> -                Ok(())
> -            }
> -        }
> -        IpAddr::V6(_) => Ok(()),
> -    }
> -}
> -
>  /// Possible errors that might occur when parsing FQDNs.
>  #[derive(Debug, Eq, PartialEq)]
>  pub enum FqdnParseError {