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

[Michael Köppl]

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 {
-- 
2.47.2