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Set/get broadcast address in TunInterface

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Modelled after TunInterface's IPV4 logic.
Uses SIOCGIFBRDADDR & SIOCSIFBRDADDR.
View https://man7.org/linux/man-pages/man7/netdevice.7.html.
This commit is contained in:
Sam Poder 2023-07-03 17:29:52 +00:00 • committed by Conrad Kramer
parent 22e41203fb
commit c8df4b860d
3 changed files with 39 additions and 0 deletions
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22
tun/src/unix/linux/mod.rs
View file

@ -103,6 +103,28 @@ impl TunInterface {
Ipv4Addr::from(u32::from_be(addr.sin_addr.s_addr))
}
#[throws]
pub fn set_broadcast_addr(&self, addr: Ipv4Addr) {
let addr = SockAddr::from(SocketAddrV4::new(addr, 0));
let mut iff = self.ifreq()?;
iff.ifr_ifru.ifru_broadaddr = unsafe { *addr.as_ptr() };
self.perform(|fd| unsafe { sys::if_set_brdaddr(fd, &iff) })?;
info!(
"broadcast_addr_set: {:?} (fd: {:?})",
addr,
self.as_raw_fd()
)
}
#[throws]
pub fn broadcast_addr(&self) -> Ipv4Addr {
let mut iff = self.ifreq()?;
self.perform(|fd| unsafe { sys::if_get_brdaddr(fd, &mut iff) })?;
let addr =
unsafe { *(&iff.ifr_ifru.ifru_broadaddr as *const _ as *const sys::sockaddr_in) };
Ipv4Addr::from(u32::from_be(addr.sin_addr.s_addr))
}
#[throws]
pub fn set_ipv6_addr(&self, addr: Ipv6Addr) {
let mut iff = self.in6_ifreq()?;

2
tun/src/unix/linux/sys.rs
View file

@ -18,10 +18,12 @@ ioctl_read_bad!(
);
ioctl_read_bad!(if_get_index, libc::SIOCGIFINDEX, libc::ifreq);
ioctl_read_bad!(if_get_addr, libc::SIOCGIFADDR, libc::ifreq);
ioctl_read_bad!(if_get_brdaddr, libc::SIOCGIFBRDADDR, libc::ifreq);
ioctl_read_bad!(if_get_mtu, libc::SIOCGIFMTU, libc::ifreq);
ioctl_read_bad!(if_get_netmask, libc::SIOCGIFNETMASK, libc::ifreq);
ioctl_write_ptr_bad!(if_set_addr, libc::SIOCSIFADDR, libc::ifreq);
ioctl_write_ptr_bad!(if_set_addr6, libc::SIOCSIFADDR, libc::in6_ifreq);
ioctl_write_ptr_bad!(if_set_brdaddr, libc::SIOCSIFBRDADDR, libc::ifreq);
ioctl_write_ptr_bad!(if_set_mtu, libc::SIOCSIFMTU, libc::ifreq);
ioctl_write_ptr_bad!(if_set_netmask, libc::SIOCSIFNETMASK, libc::ifreq);