Add constants and types for nsfs ioctls

(backport <rust-lang#4436>)
(cherry picked from commit 0d7f0ce)

Author: rusty-snake

libc-test/build.rs

@@ -3899,6 +3899,7 @@ fn test_linux(target: &str) {
             "linux/netfilter_ipv6.h",
             "linux/netfilter_ipv6/ip6_tables.h",
             "linux/netlink.h",
+            "linux/nsfs.h",
             "linux/openat2.h",
             // FIXME(linux): some items require Linux >= 5.6:
             "linux/ptp_clock.h",
@@ -4192,6 +4193,9 @@ fn test_linux(target: &str) {
             // FIXME(linux): Requires >= 6.12 kernel headers.
             "dmabuf_cmsg" | "dmabuf_token" => true,
 
+            // FIXME(linux): Requires >= 6.12 kernel headers.
+            "mnt_ns_info" => true,
+
             // FIXME(linux): Requires >= 6.4 kernel headers.
             "ptrace_sud_config" => true,
 
@@ -4597,6 +4601,11 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME(linux): Requires >= 6.11 kernel headers.
+            "NS_GET_MNTNS_ID" | "NS_GET_PID_FROM_PIDNS" | "NS_GET_TGID_FROM_PIDNS" | "NS_GET_PID_IN_PIDNS" | "NS_GET_TGID_IN_PIDNS" => true,
+            // FIXME(linux): Requires >= 6.12 kernel headers.
+            "MNT_NS_INFO_SIZE_VER0" | "NS_MNT_GET_INFO" | "NS_MNT_GET_NEXT" | "NS_MNT_GET_PREV" => true,
+
             // FIXME(linux): Requires >= 6.6 kernel headers.
             "SYS_fchmodat2" => true,
 
@@ -4952,8 +4961,8 @@ fn test_linux_like_apis(target: &str) {
             "strerror_r" => false,
             _ => true,
         })
-            .skip_const(|_| true)
-            .skip_struct(|_| true);
+        .skip_const(|_| true)
+        .skip_struct(|_| true);
         cfg.generate(src_hotfix_dir().join("lib.rs"), "linux_strerror_r.rs");
     }
 
@@ -5027,10 +5036,10 @@ fn test_linux_like_apis(target: &str) {
             .skip_const(|_| true)
             .skip_struct(|_| true)
             .skip_const(move |name| match name {
-                    "IPV6_FLOWINFO"
-                        | "IPV6_FLOWLABEL_MGR"
-                        | "IPV6_FLOWINFO_SEND"
-                        | "IPV6_FLOWINFO_FLOWLABEL"
+                "IPV6_FLOWINFO"
+                | "IPV6_FLOWLABEL_MGR"
+                | "IPV6_FLOWINFO_SEND"
+                | "IPV6_FLOWINFO_FLOWLABEL"
                 | "IPV6_FLOWINFO_PRIORITY" => false,
                 _ => true,
             })

libc-test/semver/linux.txt

@@ -1667,6 +1667,7 @@ MMAP_PAGE_ZERO
 MNT_DETACH
 MNT_EXPIRE
 MNT_FORCE
+MNT_NS_INFO_SIZE_VER0
 MODULE_INIT_IGNORE_MODVERSIONS
 MODULE_INIT_IGNORE_VERMAGIC
 MON_1
@@ -2022,6 +2023,18 @@ NLM_F_REQUEST
 NLM_F_ROOT
 NOEXPR
 NOSTR
+NS_GET_MNTNS_ID
+NS_GET_NSTYPE
+NS_GET_OWNER_UID
+NS_GET_PARENT
+NS_GET_PID_FROM_PIDNS
+NS_GET_PID_IN_PIDNS
+NS_GET_TGID_FROM_PIDNS
+NS_GET_TGID_IN_PIDNS
+NS_GET_USERNS
+NS_MNT_GET_INFO
+NS_MNT_GET_NEXT
+NS_MNT_GET_PREV
 NTF_PROXY
 NTF_ROUTER
 NTF_SELF

src/unix/linux_like/linux/mod.rs

@@ -1376,6 +1376,13 @@ s! {
         pub userns_fd: crate::__u64,
     }
 
+    // linux/nsfs.h
+    pub struct mnt_ns_info {
+        pub size: crate::__u32,
+        pub nr_mounts: crate::__u32,
+        pub mnt_ns_id: crate::__u64,
+    }
+
     // linux/pidfd.h
 
     pub struct pidfd_info {
@@ -3211,6 +3218,27 @@ pub const MREMAP_MAYMOVE: c_int = 1;
 pub const MREMAP_FIXED: c_int = 2;
 pub const MREMAP_DONTUNMAP: c_int = 4;
 
+// linux/nsfs.h
+const NSIO: c_uint = 0xb7;
+
+pub const NS_GET_USERNS: c_uint = _IO(NSIO, 0x1);
+pub const NS_GET_PARENT: c_uint = _IO(NSIO, 0x2);
+pub const NS_GET_NSTYPE: c_uint = _IO(NSIO, 0x3);
+pub const NS_GET_OWNER_UID: c_uint = _IO(NSIO, 0x4);
+
+pub const NS_GET_MNTNS_ID: c_uint = _IOR::<__u64>(NSIO, 0x5);
+
+pub const NS_GET_PID_FROM_PIDNS: c_uint = _IOR::<c_int>(NSIO, 0x6);
+pub const NS_GET_TGID_FROM_PIDNS: c_uint = _IOR::<c_int>(NSIO, 0x7);
+pub const NS_GET_PID_IN_PIDNS: c_uint = _IOR::<c_int>(NSIO, 0x8);
+pub const NS_GET_TGID_IN_PIDNS: c_uint = _IOR::<c_int>(NSIO, 0x9);
+
+pub const MNT_NS_INFO_SIZE_VER0: c_uint = 16;
+
+pub const NS_MNT_GET_INFO: c_uint = _IOR::<mnt_ns_info>(NSIO, 10);
+pub const NS_MNT_GET_NEXT: c_uint = _IOR::<mnt_ns_info>(NSIO, 11);
+pub const NS_MNT_GET_PREV: c_uint = _IOR::<mnt_ns_info>(NSIO, 12);
+
 // linux/pidfd.h
 pub const PIDFD_NONBLOCK: c_uint = O_NONBLOCK as c_uint;
 pub const PIDFD_THREAD: c_uint = O_EXCL as c_uint;