rustix/backend/linux_raw/net/
write_sockaddr.rs

1//! The BSD sockets API requires us to read the `ss_family` field before we can
2//! interpret the rest of a `sockaddr` produced by the kernel.
3#![allow(unsafe_code)]
4
5use crate::backend::c;
6#[cfg(target_os = "linux")]
7use crate::net::xdp::SocketAddrXdp;
8use crate::net::{SocketAddrAny, SocketAddrStorage, SocketAddrUnix, SocketAddrV4, SocketAddrV6};
9use core::mem::size_of;
10
11pub(crate) unsafe fn write_sockaddr(
12    addr: &SocketAddrAny,
13    storage: *mut SocketAddrStorage,
14) -> usize {
15    match addr {
16        SocketAddrAny::V4(v4) => write_sockaddr_v4(v4, storage),
17        SocketAddrAny::V6(v6) => write_sockaddr_v6(v6, storage),
18        SocketAddrAny::Unix(unix) => write_sockaddr_unix(unix, storage),
19        #[cfg(target_os = "linux")]
20        SocketAddrAny::Xdp(xdp) => write_sockaddr_xdp(xdp, storage),
21    }
22}
23
24pub(crate) fn encode_sockaddr_v4(v4: &SocketAddrV4) -> c::sockaddr_in {
25    c::sockaddr_in {
26        sin_family: c::AF_INET as _,
27        sin_port: u16::to_be(v4.port()),
28        sin_addr: c::in_addr {
29            s_addr: u32::from_ne_bytes(v4.ip().octets()),
30        },
31        __pad: [0_u8; 8],
32    }
33}
34
35unsafe fn write_sockaddr_v4(v4: &SocketAddrV4, storage: *mut SocketAddrStorage) -> usize {
36    let encoded = encode_sockaddr_v4(v4);
37    core::ptr::write(storage.cast(), encoded);
38    size_of::<c::sockaddr_in>()
39}
40
41pub(crate) fn encode_sockaddr_v6(v6: &SocketAddrV6) -> c::sockaddr_in6 {
42    c::sockaddr_in6 {
43        sin6_family: c::AF_INET6 as _,
44        sin6_port: u16::to_be(v6.port()),
45        sin6_flowinfo: u32::to_be(v6.flowinfo()),
46        sin6_addr: c::in6_addr {
47            in6_u: linux_raw_sys::net::in6_addr__bindgen_ty_1 {
48                u6_addr8: v6.ip().octets(),
49            },
50        },
51        sin6_scope_id: v6.scope_id(),
52    }
53}
54
55unsafe fn write_sockaddr_v6(v6: &SocketAddrV6, storage: *mut SocketAddrStorage) -> usize {
56    let encoded = encode_sockaddr_v6(v6);
57    core::ptr::write(storage.cast(), encoded);
58    size_of::<c::sockaddr_in6>()
59}
60
61unsafe fn write_sockaddr_unix(unix: &SocketAddrUnix, storage: *mut SocketAddrStorage) -> usize {
62    core::ptr::write(storage.cast(), unix.unix);
63    unix.len()
64}
65
66#[cfg(target_os = "linux")]
67pub(crate) fn encode_sockaddr_xdp(xdp: &SocketAddrXdp) -> c::sockaddr_xdp {
68    c::sockaddr_xdp {
69        sxdp_family: c::AF_XDP as _,
70        sxdp_flags: xdp.flags().bits(),
71        sxdp_ifindex: xdp.interface_index(),
72        sxdp_queue_id: xdp.queue_id(),
73        sxdp_shared_umem_fd: xdp.shared_umem_fd(),
74    }
75}
76
77#[cfg(target_os = "linux")]
78unsafe fn write_sockaddr_xdp(xdp: &SocketAddrXdp, storage: *mut SocketAddrStorage) -> usize {
79    let encoded = encode_sockaddr_xdp(xdp);
80    core::ptr::write(storage.cast(), encoded);
81    size_of::<c::sockaddr_xdp>()
82}
rustix/backend/linux_raw/net/write_sockaddr.rs

rustix/backend/linux_raw/net/
write_sockaddr.rs
