mozim: do not use netlink feature

mozim uses rtnetlink which we do not otherwise. All mozim uses it for is
to get the interface index which can lookup easily ourselves.

This saves about 500KB in binary size.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Cargo.lock

@@ -593,7 +593,6 @@ checksum = "65bc07b1a8bc7c85c5f2e110c476c7389b4554ba72af57d8445ea63a576b0876"
 dependencies = [
  "futures-channel",
  "futures-core",
- "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -616,17 +615,6 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "05f29059c0c2090612e8d742178b0580d2dc940c837851ad723096f87af6663e"
 
-[[package]]
-name = "futures-executor"
-version = "0.3.31"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e28d1d997f585e54aebc3f97d39e72338912123a67330d723fdbb564d646c9f"
-dependencies = [
- "futures-core",
- "futures-task",
- "futures-util",
-]
-
 [[package]]
 name = "futures-io"
 version = "0.3.31"
@@ -1019,9 +1007,8 @@ dependencies = [
  "futures",
  "libc",
  "log",
- "nix 0.30.1",
+ "nix",
  "rand",
- "rtnetlink",
  "tokio",
 ]
 
@@ -1052,7 +1039,7 @@ dependencies = [
  "netlink-packet-route",
  "netlink-sys",
  "nftables",
- "nix 0.30.1",
+ "nix",
  "once_cell",
  "prost",
  "rand",
@@ -1090,20 +1077,6 @@ dependencies = [
  "netlink-packet-core",
 ]
 
-[[package]]
-name = "netlink-proto"
-version = "0.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b65d130ee111430e47eed7896ea43ca693c387f097dd97376bffafbf25812128"
-dependencies = [
- "bytes",
- "futures",
- "log",
- "netlink-packet-core",
- "netlink-sys",
- "thiserror 2.0.17",
-]
-
 [[package]]
 name = "netlink-sys"
 version = "0.8.7"
@@ -1111,10 +1084,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16c903aa70590cb93691bf97a767c8d1d6122d2cc9070433deb3bbf36ce8bd23"
 dependencies = [
  "bytes",
- "futures",
  "libc",
  "log",
- "tokio",
 ]
 
 [[package]]
@@ -1129,19 +1100,7 @@ dependencies = [
  "serde_path_to_error",
  "strum",
  "strum_macros",
- "thiserror 2.0.17",
-]
-
-[[package]]
-name = "nix"
-version = "0.29.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "71e2746dc3a24dd78b3cfcb7be93368c6de9963d30f43a6a73998a9cf4b17b46"
-dependencies = [
- "bitflags",
- "cfg-if",
- "cfg_aliases",
- "libc",
+ "thiserror",
 ]
 
 [[package]]
@@ -1492,23 +1451,6 @@ version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
 
-[[package]]
-name = "rtnetlink"
-version = "0.18.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08fd15aa4c64c34d0b3178e45ec6dad313a9f02b193376d501668a7950264bb7"
-dependencies = [
- "futures",
- "log",
- "netlink-packet-core",
- "netlink-packet-route",
- "netlink-proto",
- "netlink-sys",
- "nix 0.29.0",
- "thiserror 1.0.69",
- "tokio",
-]
-
 [[package]]
 name = "rustix"
 version = "1.1.2"
@@ -1743,33 +1685,13 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "thiserror"
-version = "1.0.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
-dependencies = [
- "thiserror-impl 1.0.69",
-]
-
 [[package]]
 name = "thiserror"
 version = "2.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f63587ca0f12b72a0600bcba1d40081f830876000bb46dd2337a3051618f4fc8"
 dependencies = [
- "thiserror-impl 2.0.17",
-]
-
-[[package]]
-name = "thiserror-impl"
-version = "1.0.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
+ "thiserror-impl",
 ]
 
 [[package]]
@@ -2320,7 +2242,7 @@ dependencies = [
  "futures-core",
  "futures-lite",
  "hex",
- "nix 0.30.1",
+ "nix",
  "ordered-stream",
  "serde",
  "serde_repr",

Cargo.toml

@@ -55,7 +55,7 @@ tokio-stream = { version = "0.1.17", features = ["net"] }
 tonic = "0.14.2"
 tonic-prost = "0.14.2"
 prost = "0.14.1"
-mozim = "0.3.1"
+mozim = { version = "0.3.1", default-features = false }
 futures-channel = "0.3.31"
 futures-core = "0.3.31"
 futures-util = "0.3.31"

src/dhcp_proxy/dhcp_service.rs

@@ -1,6 +1,9 @@
 use std::{net::Ipv4Addr, sync::Arc};
 
-use crate::network::netlink_route::{LinkID, Route};
+use crate::network::{
+    netlink,
+    netlink_route::{LinkID, NetlinkRoute, Route},
+};
 use log::debug;
 use mozim::{DhcpV4Client, DhcpV4Config, DhcpV4Lease as MozimV4Lease, DhcpV4State};
 use tokio::sync::Mutex;
@@ -54,6 +57,14 @@ impl DhcpV4Service {
             .map_err(|e| DhcpServiceError::new(InvalidArgument, e.to_string()))?;
         config.set_timeout_sec(timeout);
 
+        let mut socket = netlink::Socket::<NetlinkRoute>::new()
+            .map_err(|e| DhcpServiceError::new(InvalidArgument, e.to_string()))?;
+        let link = socket
+            .get_link(LinkID::Name(nc.host_iface.clone()))
+            .map_err(|e| DhcpServiceError::new(InvalidArgument, e.to_string()))?;
+
+        config.set_iface_index(link.header.index);
+
         // Sending the hostname to the DHCP server is optional but it can be
         // useful in environments where DDNS is used to create or update
         // DNS records.