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Fri, 06 Mar 2026 07:12:27 -0800 (PST) Date: Fri, 06 Mar 2026 15:12:15 +0000 In-Reply-To: <20260306-binder-netlink-v1-0-daceb5bc83f2@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260306-binder-netlink-v1-0-daceb5bc83f2@google.com> X-Developer-Key: i=aliceryhl@google.com; a=openpgp; fpr=49F6C1FAA74960F43A5B86A1EE7A392FDE96209F X-Developer-Signature: v=1; a=openpgp-sha256; l=7753; i=aliceryhl@google.com; h=from:subject:message-id; bh=Sk1TAxEEV4GhsxW0UREgc7Kuhcte6geJK72w1Dswhp0=; b=owEBbQKS/ZANAwAKAQRYvu5YxjlGAcsmYgBpqu7V1SkNGeGtAl99aCrvoRQqa5WaFdwWxGa6A sYlU5EocSmJAjMEAAEKAB0WIQSDkqKUTWQHCvFIvbIEWL7uWMY5RgUCaaru1QAKCRAEWL7uWMY5 RqWSEACpsPjJtTqGr9LbRZAqK0TdOwEL3LxqkFcUggStQFpHcFhIEnIqPonudosX/Npk9XxEtfK VFbNxrRny+tyU92GuA4C0xd0r2StiWliofGelTxDAo78F+J5hOTFNYIskP/H49JqM84lWDoW3gI uxqoKplpRe93kAsQQyU7OSWQ++sUAzVdO0Z+vXakJ8xGPktO546+/SGPdsgh6feIj0khjlfsinF IcfsiSRLgBAnsu34971biAiqXWMY94dYR412L4Y16HfNS0JZ+Z9znQnn//nSfEaNd8SosdE+giZ lLW3yI/Lwe4A85wleV+kWWxPKWr9OeCigGsGeAilYVVk2804nVrUOh0HK6cOJK7lrSFaW6MAa2S ZPqMN8THwytpPo1r6enQD9xVc9TOPBcS9smg8ztIwaTAuU9ZNZFIgPAoN54avZmMVJACBGTPecV TEalNrpdWZqWmsB5l2KnV3xOuvoeSBuDoXwwptlQmrNeHd9Vr3Qu2ALK7EVClQssaO2FlfUQH0w 7W0L4L8hllvhN1U29uDqDY2jG0lUwUKkh0Xv+H5aR/2Uo/Lx9kwKGoJTg7QPCGpkWQLHBsnGZxH FmOboOlr4cKkAPa5TCzd6sxY9pslKIBhXIsG2nNSBf37dO9sRV2DkozKqwAlbEAe+ufd6UnKJbU /DrlwJTXOM4VVzQ== X-Mailer: b4 0.14.3 Message-ID: <20260306-binder-netlink-v1-3-daceb5bc83f2@google.com> Subject: [PATCH 3/4] rust_binder: add generated netlink.rs file From: Alice Ryhl To: Miguel Ojeda , Boqun Feng , Gary Guo , "=?utf-8?q?Bj=C3=B6rn_Roy_Baron?=" , Benno Lossin , Andreas Hindborg , Trevor Gross , Danilo Krummrich , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Greg Kroah-Hartman , "=?utf-8?q?Arve_Hj=C3=B8nnev=C3=A5g?=" , Todd Kjos , Christian Brauner , Carlos Llamas Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, netdev@vger.kernel.org, Alice Ryhl Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable To use netlink from Rust Binder, add a new generated netlink file using the new script and Documentation/netlink/specs/binder.yaml. Signed-off-by: Alice Ryhl --- drivers/android/Kconfig | 2 +- drivers/android/binder/netlink.rs | 113 +++++++++++++++++++++++++= ++++ drivers/android/binder/rust_binder_main.rs | 9 ++- rust/uapi/uapi_helper.h | 1 + 4 files changed, 122 insertions(+), 3 deletions(-) diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig index e2e402c9d175..606a9d07f774 100644 --- a/drivers/android/Kconfig +++ b/drivers/android/Kconfig @@ -16,7 +16,7 @@ config ANDROID_BINDER_IPC =20 config ANDROID_BINDER_IPC_RUST bool "Rust version of Android Binder IPC Driver" - depends on RUST && MMU && !ANDROID_BINDER_IPC + depends on RUST && MMU && NET && !ANDROID_BINDER_IPC help This enables the Rust implementation of the Binder driver. =20 diff --git a/drivers/android/binder/netlink.rs b/drivers/android/binder/net= link.rs new file mode 100644 index 000000000000..0537be08f4d5 --- /dev/null +++ b/drivers/android/binder/netlink.rs @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Cl= ause) +/* Do not edit directly, auto-generated from: */ +/* Documentation/netlink/specs/binder.yaml */ +/* YNL-GEN rust source */ +/* To regenerate run: tools/net/ynl/ynl-regen.sh */ + +#![allow(unreachable_pub, clippy::wrong_self_convention)] +use kernel::netlink::{Family, MulticastGroup}; +use kernel::prelude::*; + +pub static BINDER_NL_FAMILY: Family =3D Family::const_new( + &crate::THIS_MODULE, + kernel::uapi::BINDER_FAMILY_NAME, + kernel::uapi::BINDER_FAMILY_VERSION, + &BINDER_NL_FAMILY_MCGRPS, +); + +static BINDER_NL_FAMILY_MCGRPS: [MulticastGroup; 1] =3D [MulticastGroup::c= onst_new(c"report")]; + +/// A multicast event sent to userspace subscribers to notify them about +/// binder transaction failures. The generated report provides the full +/// details of the specific transaction that failed. The intention is for +/// programs to monitor these events and react to the failures as needed. +pub struct Report { + skb: kernel::netlink::GenlMsg, +} + +impl Report { + /// Create a new multicast message. + pub fn new( + size: usize, + portid: u32, + seq: u32, + flags: kernel::alloc::Flags, + ) -> Result { + const BINDER_CMD_REPORT: u8 =3D kernel::uapi::BINDER_CMD_REPORT as= u8; + let skb =3D kernel::netlink::SkBuff::new(size, flags)?; + let skb =3D skb.genlmsg_put(portid, seq, &BINDER_NL_FAMILY, BINDER= _CMD_REPORT)?; + Ok(Self { skb }) + } + + /// Broadcast this message. + pub fn multicast(self, portid: u32, flags: kernel::alloc::Flags) -> Re= sult { + self.skb.multicast(&BINDER_NL_FAMILY, portid, 0, flags) + } + + /// Check if this message type has listeners. + pub fn has_listeners() -> bool { + BINDER_NL_FAMILY.has_listeners(0) + } + + /// The enum binder_driver_return_protocol returned to the sender. + pub fn error(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_ERROR: c_int =3D kernel::uapi::BINDER_A_REPO= RT_ERROR as c_int; + self.skb.put_u32(BINDER_A_REPORT_ERROR, val) + } + + /// The binder context where the transaction occurred. + pub fn context(&mut self, val: &CStr) -> Result { + const BINDER_A_REPORT_CONTEXT: c_int =3D kernel::uapi::BINDER_A_RE= PORT_CONTEXT as c_int; + self.skb.put_string(BINDER_A_REPORT_CONTEXT, val) + } + + /// The PID of the sender process. + pub fn from_pid(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_FROM_PID: c_int =3D kernel::uapi::BINDER_A_R= EPORT_FROM_PID as c_int; + self.skb.put_u32(BINDER_A_REPORT_FROM_PID, val) + } + + /// The TID of the sender thread. + pub fn from_tid(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_FROM_TID: c_int =3D kernel::uapi::BINDER_A_R= EPORT_FROM_TID as c_int; + self.skb.put_u32(BINDER_A_REPORT_FROM_TID, val) + } + + /// The PID of the recipient process. This attribute may not be present + /// if the target could not be determined. + pub fn to_pid(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_TO_PID: c_int =3D kernel::uapi::BINDER_A_REP= ORT_TO_PID as c_int; + self.skb.put_u32(BINDER_A_REPORT_TO_PID, val) + } + + /// The TID of the recipient thread. This attribute may not be present + /// if the target could not be determined. + pub fn to_tid(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_TO_TID: c_int =3D kernel::uapi::BINDER_A_REP= ORT_TO_TID as c_int; + self.skb.put_u32(BINDER_A_REPORT_TO_TID, val) + } + + /// When present, indicates the failed transaction is a reply. + pub fn is_reply(&mut self) -> Result { + const BINDER_A_REPORT_IS_REPLY: c_int =3D kernel::uapi::BINDER_A_R= EPORT_IS_REPLY as c_int; + self.skb.put_flag(BINDER_A_REPORT_IS_REPLY) + } + + /// The bitmask of enum transaction_flags from the transaction. + pub fn flags(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_FLAGS: c_int =3D kernel::uapi::BINDER_A_REPO= RT_FLAGS as c_int; + self.skb.put_u32(BINDER_A_REPORT_FLAGS, val) + } + + /// The application-defined code from the transaction. + pub fn code(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_CODE: c_int =3D kernel::uapi::BINDER_A_REPOR= T_CODE as c_int; + self.skb.put_u32(BINDER_A_REPORT_CODE, val) + } + + /// The transaction payload size in bytes. + pub fn data_size(&mut self, val: u32) -> Result { + const BINDER_A_REPORT_DATA_SIZE: c_int =3D kernel::uapi::BINDER_A_= REPORT_DATA_SIZE as c_int; + self.skb.put_u32(BINDER_A_REPORT_DATA_SIZE, val) + } +} diff --git a/drivers/android/binder/rust_binder_main.rs b/drivers/android/b= inder/rust_binder_main.rs index aa5f2a75adb4..65dae8931676 100644 --- a/drivers/android/binder/rust_binder_main.rs +++ b/drivers/android/binder/rust_binder_main.rs @@ -36,6 +36,8 @@ mod deferred_close; mod defs; mod error; +#[allow(dead_code)] +mod netlink; mod node; mod page_range; mod process; @@ -285,7 +287,9 @@ fn ptr_align(value: usize) -> Option { // SAFETY: We call register in `init`. static BINDER_SHRINKER: Shrinker =3D unsafe { Shrinker::new() }; =20 -struct BinderModule {} +struct BinderModule { + _netlink: kernel::netlink::Registration, +} =20 impl kernel::Module for BinderModule { fn init(_module: &'static kernel::ThisModule) -> Result { @@ -294,12 +298,13 @@ fn init(_module: &'static kernel::ThisModule) -> Resu= lt { =20 pr_warn!("Loaded Rust Binder."); =20 + let netlink =3D crate::netlink::BINDER_NL_FAMILY.register()?; BINDER_SHRINKER.register(c"android-binder")?; =20 // SAFETY: The module is being loaded, so we can initialize binder= fs. unsafe { kernel::error::to_result(binderfs::init_rust_binderfs())?= }; =20 - Ok(Self {}) + Ok(Self { _netlink: netlink }) } } =20 diff --git a/rust/uapi/uapi_helper.h b/rust/uapi/uapi_helper.h index 06d7d1a2e8da..86c7b6b284b0 100644 --- a/rust/uapi/uapi_helper.h +++ b/rust/uapi/uapi_helper.h @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include --=20 2.53.0.473.g4a7958ca14-goog