Add ip(v6)_checksum socket options

src/backend/libc/net/sockopt.rs

@@ -873,6 +873,42 @@ pub(crate) fn ipv6_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
     getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND).map(to_bool)
 }
 
+#[cfg(any(linux_like, target_os = "cygwin", target_os = "fuchsia",))]
+#[inline]
+pub(crate) fn set_ip_checksum(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_CHECKSUM, value)
+}
+
+#[cfg(any(linux_like, target_os = "cygwin", target_os = "fuchsia",))]
+#[inline]
+pub(crate) fn ip_checksum(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_CHECKSUM)
+}
+
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+pub(crate) fn set_ipv6_checksum(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_CHECKSUM, value)
+}
+
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+pub(crate) fn ipv6_checksum(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_CHECKSUM)
+}
+
 #[cfg(any(linux_kernel, target_os = "fuchsia"))]
 #[inline]
 pub(crate) fn ip_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV4> {

src/backend/linux_raw/c.rs

@@ -86,12 +86,12 @@ pub(crate) use linux_raw_sys::{
         AF_LLC, AF_NETBEUI, AF_NETLINK, AF_NETROM, AF_PACKET, AF_PHONET, AF_PPPOX, AF_RDS, AF_ROSE,
         AF_RXRPC, AF_SECURITY, AF_SNA, AF_TIPC, AF_UNIX, AF_UNSPEC, AF_VSOCK, AF_WANPIPE, AF_X25,
         AF_XDP, IP6T_SO_ORIGINAL_DST, IPPROTO_FRAGMENT, IPPROTO_ICMPV6, IPPROTO_MH,
-        IPPROTO_ROUTING, IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_FREEBIND,
+        IPPROTO_ROUTING, IPV6_ADD_MEMBERSHIP, IPV6_CHECKSUM, IPV6_DROP_MEMBERSHIP, IPV6_FREEBIND,
         IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_PMTUDISC_DO, IPV6_PMTUDISC_DONT,
         IPV6_PMTUDISC_INTERFACE, IPV6_PMTUDISC_OMIT, IPV6_PMTUDISC_PROBE, IPV6_PMTUDISC_WANT,
         IPV6_RECVTCLASS, IPV6_TCLASS, IPV6_UNICAST_HOPS, IPV6_V6ONLY, IP_ADD_MEMBERSHIP,
-        IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, IP_DROP_SOURCE_MEMBERSHIP, IP_FREEBIND,
-        IP_MULTICAST_LOOP, IP_MULTICAST_TTL, IP_PMTUDISC_DO, IP_PMTUDISC_DONT,
+        IP_ADD_SOURCE_MEMBERSHIP, IP_CHECKSUM, IP_DROP_MEMBERSHIP, IP_DROP_SOURCE_MEMBERSHIP,
+        IP_FREEBIND, IP_MULTICAST_LOOP, IP_MULTICAST_TTL, IP_PMTUDISC_DO, IP_PMTUDISC_DONT,
         IP_PMTUDISC_INTERFACE, IP_PMTUDISC_OMIT, IP_PMTUDISC_PROBE, IP_PMTUDISC_WANT, IP_RECVTOS,
         IP_TOS, IP_TTL, MSG_CMSG_CLOEXEC, MSG_CONFIRM, MSG_CTRUNC, MSG_DONTROUTE, MSG_DONTWAIT,
         MSG_EOR, MSG_ERRQUEUE, MSG_MORE, MSG_NOSIGNAL, MSG_OOB, MSG_PEEK, MSG_TRUNC, MSG_WAITALL,

src/backend/linux_raw/net/sockopt.rs

@@ -724,6 +724,26 @@ pub(crate) fn ipv6_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
     getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND).map(to_bool)
 }
 
+#[inline]
+pub(crate) fn set_ip_checksum(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_CHECKSUM, value)
+}
+
+#[inline]
+pub(crate) fn ip_checksum(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_CHECKSUM)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_checksum(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_CHECKSUM, value)
+}
+
+#[inline]
+pub(crate) fn ipv6_checksum(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_CHECKSUM)
+}
+
 #[inline]
 pub(crate) fn ip_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV4> {
     let level = c::IPPROTO_IP;

src/net/sockopt.rs

@@ -1359,6 +1359,66 @@ pub fn ipv6_freebind<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
     backend::net::sockopt::ipv6_freebind(fd.as_fd())
 }
 
+/// `setsockopt(fd, IPPROTO_IP, IP_CHECKSUM, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_like, target_os = "cygwin", target_os = "fuchsia",))]
+#[inline]
+#[doc(alias = "IP_CHECKSUM")]
+pub fn set_ip_checksum<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ip_checksum(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_CHECKSUM)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_like, target_os = "cygwin", target_os = "fuchsia",))]
+#[inline]
+#[doc(alias = "IP_CHECKSUM")]
+pub fn ip_checksum<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::ip_checksum(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_CHECKSUM, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+#[doc(alias = "IPV6_CHECKSUM")]
+pub fn set_ipv6_checksum<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_checksum(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_CHECKSUM)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+#[doc(alias = "IPV6_CHECKSUM")]
+pub fn ipv6_checksum<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::ipv6_checksum(fd.as_fd())
+}
+
 /// `getsockopt(fd, IPPROTO_IP, SO_ORIGINAL_DST)`
 ///
 /// Even though this corresponds to a `SO_*` constant, it is an `IPPROTO_IP`