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rust: net: netlink: Migrate to zerocopy's IntoBytes

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Replace the kernel's own `transmute::FromBytes` and `AsBytes` traits
with their zerocopy equivalents. Specifically, this updates
`GenlMsg::put` to rely on `IntoBytes` for converting attributes into
byte slices.

Also, add `Immutable` trait bound on `GenlMsg::put` as zerocopy
splits the `no interior mutability` guarantee that `AsBytes` bundled
together.

Link: https://github.com/Rust-for-Linux/linux/issues/1241
Signed-off-by: Sagar Taunk <sagartaunk@proton.me>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260915144231.31932-1-sagartaunk@proton.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sagar Taunk 2026-09-15 14:42:44 +00:00 committed by Jakub Kicinski
parent 7c6a3f0a84
commit 5e59169237
1 changed files with 6 additions and 2 deletions
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8
rust/kernel/net/netlink.rs
View File

@ -12,7 +12,6 @@
alloc::{self, AllocError}, alloc::{self, AllocError},
error::to_result, error::to_result,
prelude::*, prelude::*,
transmute::AsBytes,
types::Opaque, types::Opaque,
ThisModule, ThisModule,
}; };
@ -22,6 +21,11 @@
ptr::NonNull, // ptr::NonNull, //
}; };
use zerocopy::{
Immutable,
IntoBytes, //
};
/// The default netlink message size. /// The default netlink message size.
pub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE; pub const GENLMSG_DEFAULT_SIZE: usize = bindings::GENLMSG_DEFAULT_SIZE;
@ -84,7 +88,7 @@ impl GenlMsg {
#[inline] #[inline]
fn put<T>(&mut self, attrtype: c_int, value: &T) -> Result fn put<T>(&mut self, attrtype: c_int, value: &T) -> Result
where where
T: ?Sized + AsBytes, T: ?Sized + IntoBytes + Immutable,
{ {
let skb = self.skb.skb.as_ptr(); let skb = self.skb.skb.as_ptr();
let len = size_of_val(value); let len = size_of_val(value);