Rollup merge of #116714 - WaffleLapkin:order-the-order, r=joshtriplett

Derive `Ord`, `PartialOrd` and `Hash` for `SocketAddr*`

Fixes #116711

The main pain of this PR is to fix the buggy impl of `Ord` for `SocketAddrV6`, which ignored half of the fields (while `PartialEq` is derived):
4603f0b8af/library/core/src/net/socket_addr.rs (L99-L106)

4603f0b8af/library/core/src/net/socket_addr.rs (L676)

For me it looks like a simple copy-paste error made in https://github.com/rust-lang/rust/pull/72239 (copy from v4 impl) (cc `@hch12907),` as I don't see this behavior being mentioned anywhere on the PR and it also does not respect `cmp` trait "rules". I also do not see any reasons for those impls to _not_ be derived.

It's a shame we did not notice this for 28 versions/3 years. I guess this is a bug fix, but I'm not sure what the process here should be.

r? libs

library/core/src/net/socket_addr.rs

@@ -1,6 +1,4 @@
-use crate::cmp::Ordering;
 use crate::fmt::{self, Write};
-use crate::hash;
 use crate::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
 use super::display_buffer::DisplayBuffer;
@@ -63,7 +61,7 @@ pub enum SocketAddr {
 /// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
 /// assert_eq!(socket.port(), 8080);
 /// ```
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct SocketAddrV4 {
     ip: Ipv4Addr,
@@ -96,7 +94,7 @@ pub struct SocketAddrV4 {
 /// assert_eq!(socket.ip(), &Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1));
 /// assert_eq!(socket.port(), 8080);
 /// ```
-#[derive(Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct SocketAddrV6 {
     ip: Ipv6Addr,
@@ -644,48 +642,3 @@ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         fmt::Display::fmt(self, fmt)
     }
 }
-
-#[stable(feature = "socketaddr_ordering", since = "1.45.0")]
-impl PartialOrd for SocketAddrV4 {
-    #[inline]
-    fn partial_cmp(&self, other: &SocketAddrV4) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-#[stable(feature = "socketaddr_ordering", since = "1.45.0")]
-impl PartialOrd for SocketAddrV6 {
-    #[inline]
-    fn partial_cmp(&self, other: &SocketAddrV6) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-#[stable(feature = "socketaddr_ordering", since = "1.45.0")]
-impl Ord for SocketAddrV4 {
-    #[inline]
-    fn cmp(&self, other: &SocketAddrV4) -> Ordering {
-        self.ip().cmp(other.ip()).then(self.port().cmp(&other.port()))
-    }
-}
-
-#[stable(feature = "socketaddr_ordering", since = "1.45.0")]
-impl Ord for SocketAddrV6 {
-    #[inline]
-    fn cmp(&self, other: &SocketAddrV6) -> Ordering {
-        self.ip().cmp(other.ip()).then(self.port().cmp(&other.port()))
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl hash::Hash for SocketAddrV4 {
-    fn hash<H: hash::Hasher>(&self, s: &mut H) {
-        (self.port, self.ip).hash(s)
-    }
-}
-#[stable(feature = "rust1", since = "1.0.0")]
-impl hash::Hash for SocketAddrV6 {
-    fn hash<H: hash::Hasher>(&self, s: &mut H) {
-        (self.port, &self.ip, self.flowinfo, self.scope_id).hash(s)
-    }
-}

library/core/tests/net/socket_addr.rs

@@ -199,6 +199,9 @@ fn compare() {
     let v6_1 = "[2001:db8:f00::1002]:23456".parse::<SocketAddrV6>().unwrap();
     let v6_2 = "[2001:db8:f00::2001]:12345".parse::<SocketAddrV6>().unwrap();
     let v6_3 = "[2001:db8:f00::2001]:23456".parse::<SocketAddrV6>().unwrap();
+    let v6_4 = "[2001:db8:f00::2001%42]:23456".parse::<SocketAddrV6>().unwrap();
+    let mut v6_5 = "[2001:db8:f00::2001]:23456".parse::<SocketAddrV6>().unwrap();
+    v6_5.set_flowinfo(17);
 
     // equality
     assert_eq!(v4_1, v4_1);
@@ -207,6 +210,8 @@ fn compare() {
     assert_eq!(SocketAddr::V6(v6_1), SocketAddr::V6(v6_1));
     assert!(v4_1 != v4_2);
     assert!(v6_1 != v6_2);
+    assert!(v6_3 != v6_4);
+    assert!(v6_3 != v6_5);
 
     // compare different addresses
     assert!(v4_1 < v4_2);
@@ -226,6 +231,12 @@ fn compare() {
     assert!(v4_3 > v4_1);
     assert!(v6_3 > v6_1);
 
+    // compare the same address with different scope_id
+    assert!(v6_3 < v6_4);
+
+    // compare the same address with different flowinfo
+    assert!(v6_3 < v6_5);
+
     // compare with an inferred right-hand side
     assert_eq!(v4_1, "224.120.45.1:23456".parse().unwrap());
     assert_eq!(v6_1, "[2001:db8:f00::1002]:23456".parse().unwrap());