diff --git a/src/header/fcntl/redox.rs b/src/header/fcntl/redox.rs
index efe7beed58..de3ebe4db2 100644
--- a/src/header/fcntl/redox.rs
+++ b/src/header/fcntl/redox.rs
@@ -22,3 +22,5 @@ pub const O_SYMLINK: c_int = 0x4000_0000;
 pub const O_NOFOLLOW: c_int = -0x8000_0000;
 
 pub const FD_CLOEXEC: c_int = 0x0100_0000;
+
+pub const O_NOCTTY: c_int = 0x00000200;
diff --git a/src/header/netinet_in/cbindgen.toml b/src/header/netinet_in/cbindgen.toml
index 2467174a3b..fcc704f4bb 100644
--- a/src/header/netinet_in/cbindgen.toml
+++ b/src/header/netinet_in/cbindgen.toml
@@ -7,7 +7,7 @@ no_includes = true
 cpp_compat = true
 
 [export]
-include = ["sockaddr_in6", "sockaddr_in", "ipv6_mreq"]
+include = ["sockaddr_in6", "sockaddr_in", "ipv6_mreq", "ip_mreq", "ip_mreq_source"]
 
 [enum]
 prefix_with_name = true
diff --git a/src/header/netinet_in/mod.rs b/src/header/netinet_in/mod.rs
index 72a4f622f3..721d7a7d72 100644
--- a/src/header/netinet_in/mod.rs
+++ b/src/header/netinet_in/mod.rs
@@ -60,6 +60,20 @@ pub const IPPROTO_IPV6: u8 = 41;
 pub const IPPROTO_RAW: u8 = 0xff;
 pub const IPPROTO_MAX: u8 = 0xff;
 
+pub const IP_TTL: c_int = 2;
+pub const IPV6_UNICAST_HOPS: c_int = 16;
+pub const IPV6_MULTICAST_IF: c_int = 17;
+pub const IPV6_MULTICAST_HOPS: c_int = 18;
+pub const IPV6_MULTICAST_LOOP: c_int = 19;
+pub const IPV6_ADD_MEMBERSHIP: c_int = 20;
+pub const IPV6_DROP_MEMBERSHIP: c_int = 21;
+pub const IPV6_V6ONLY: c_int = 26;
+pub const IP_MULTICAST_IF: c_int = 32;
+pub const IP_MULTICAST_TTL: c_int = 33;
+pub const IP_MULTICAST_LOOP: c_int = 34;
+pub const IP_ADD_MEMBERSHIP: c_int = 35;
+pub const IP_DROP_MEMBERSHIP: c_int = 36;
+
 pub const INADDR_ANY: u32 = 0; // Can't use in_addr_t alias because cbindgen :(
 pub const INADDR_BROADCAST: u32 = 0xFFFF_FFFF; // Can't use core::u32::MAX because cbindgen :(
 pub const INADDR_NONE: u32 = 0xFFFF_FFFF;
@@ -70,6 +84,19 @@ pub const INADDR_ALLHOSTS_GROUP: u32 = 0xE000_0001;
 pub const INADDR_ALLRTRS_GROUP: u32 = 0xE000_0002;
 pub const INADDR_MAX_LOCAL_GROUP: u32 = 0xE000_00FF;
 
+#[repr(C)]
+pub struct ip_mreq_source {
+    pub imr_multiaddr: in_addr,
+    pub imr_interface: in_addr,
+    pub imr_sourceaddr: in_addr,
+}
+
+#[repr(C)]
+pub struct ip_mreq {
+    pub imr_multiaddr: in_addr,
+    pub imr_interface: in_addr,
+}
+
 #[no_mangle]
 pub static in6addr_any: in6_addr = in6_addr {
     s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
diff --git a/src/header/sys_socket/constants.rs b/src/header/sys_socket/constants.rs
index f5e794a1d8..89af160539 100644
--- a/src/header/sys_socket/constants.rs
+++ b/src/header/sys_socket/constants.rs
@@ -51,6 +51,11 @@ pub const MSG_TRUNC: c_int = 32;
 pub const MSG_DONTWAIT: c_int = 64;
 pub const MSG_WAITALL: c_int = 256;
 
+pub const IP_ADD_SOURCE_MEMBERSHIP: c_int = 70;
+pub const IP_DROP_SOURCE_MEMBERSHIP: c_int = 71;
+pub const MCAST_JOIN_SOURCE_GROUP: c_int = 46;
+pub const MCAST_LEAVE_SOURCE_GROUP: c_int = 47;
+
 pub const AF_INET: c_int = 2;
 pub const AF_INET6: c_int = 10;
 pub const AF_LOCAL: c_int = AF_UNIX;
@@ -66,3 +71,5 @@ pub const PF_UNSPEC: c_int = 0;
 pub const SHUT_RD: c_int = 0;
 pub const SHUT_RDWR: c_int = 2;
 pub const SHUT_WR: c_int = 1;
+
+pub const SCM_RIGHTS: c_int = 1;
diff --git a/src/header/sys_socket/mod.rs b/src/header/sys_socket/mod.rs
index 576a8fb33d..659eceac32 100644
--- a/src/header/sys_socket/mod.rs
+++ b/src/header/sys_socket/mod.rs
@@ -1,6 +1,6 @@
 //! socket implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xns/syssocket.h.html
 
-use core::ptr;
+use core::{mem, ptr};
 
 use crate::{
     error::ResultExt,
@@ -34,6 +34,13 @@ pub struct msghdr {
     pub msg_flags: c_int,
 }
 
+#[repr(C)]
+pub struct cmsghdr {
+    pub cmsg_len: size_t,
+    pub cmsg_level: c_int,
+    pub cmsg_type: c_int,
+}
+
 #[repr(C)]
 #[derive(Default)]
 pub struct sockaddr {
@@ -41,6 +48,72 @@ pub struct sockaddr {
     pub sa_data: [c_char; 14],
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_ALIGN(len: size_t) -> size_t {
+    (len + mem::size_of::<size_t>() - 1) & !(mem::size_of::<size_t>() - 1)
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_LEN(length: c_uint) -> c_uint {
+    (CMSG_ALIGN(mem::size_of::<cmsghdr>()) + length as usize) as c_uint
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_SPACE(len: c_uint) -> c_uint {
+    (CMSG_ALIGN(len as size_t) + CMSG_ALIGN(mem::size_of::<cmsghdr>())) as c_uint
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_FIRSTHDR(mhdr: *const msghdr) -> *mut cmsghdr {
+    unsafe {
+        if (*mhdr).msg_controllen as usize >= mem::size_of::<cmsghdr>() {
+            (*mhdr).msg_control as *mut cmsghdr
+        } else {
+            0 as *mut cmsghdr
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_NXTHDR(mhdr: *const msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
+    if cmsg.is_null() {
+        return CMSG_FIRSTHDR(mhdr);
+    };
+
+    unsafe {
+        let next = cmsg as usize
+            + CMSG_ALIGN((*cmsg).cmsg_len as usize)
+            + CMSG_ALIGN(mem::size_of::<cmsghdr>());
+        let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
+        if next > max {
+            0 as *mut cmsghdr
+        } else {
+            (cmsg as usize + CMSG_ALIGN((*cmsg).cmsg_len as usize)) as *mut cmsghdr
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn CMSG_DATA(cmsg: *const cmsghdr) -> *mut c_uchar {
+    unsafe { (cmsg as *mut c_uchar).offset(CMSG_ALIGN(mem::size_of::<cmsghdr>()) as isize) }
+}
+
+#[no_mangle]
+pub fn __MHDR_END(mhdr: *const msghdr) -> *mut c_uchar {
+    unsafe { (*mhdr).msg_control.offset((*mhdr).msg_controllen as isize) }.cast()
+}
+
+#[no_mangle]
+pub fn __CMSG_LEN(cmsg: *const cmsghdr) -> ssize_t {
+    ((unsafe { (*cmsg).cmsg_len as size_t } + mem::size_of::<c_long>() - 1)
+        & !(mem::size_of::<c_long>() - 1)) as ssize_t
+}
+
+#[no_mangle]
+pub fn __CMSG_NEXT(cmsg: *const cmsghdr) -> *mut c_uchar {
+    (unsafe { cmsg.offset(__CMSG_LEN(cmsg)) }) as *mut c_uchar
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn accept(
     socket: c_int,
diff --git a/src/header/unistd/sysconf.rs b/src/header/unistd/sysconf.rs
index 15074a5852..5e13346019 100644
--- a/src/header/unistd/sysconf.rs
+++ b/src/header/unistd/sysconf.rs
@@ -19,6 +19,9 @@ pub const _SC_PAGESIZE: c_int = 30;
 pub const _SC_PAGE_SIZE: c_int = 30;
 // ...
 pub const _SC_RE_DUP_MAX: c_int = 44;
+
+pub const _SC_NPROCESSORS_ONLN: c_int = 58;
+
 // ...
 pub const _SC_GETGR_R_SIZE_MAX: c_int = 69;
 pub const _SC_GETPW_R_SIZE_MAX: c_int = 70;
@@ -52,6 +55,7 @@ pub extern "C" fn sysconf(name: c_int) -> c_long {
         _SC_TTY_NAME_MAX => 32,
         _SC_SYMLOOP_MAX => -1,
         _SC_HOST_NAME_MAX => 64,
+        _SC_NPROCESSORS_ONLN => 1,
         _ => {
             platform::ERRNO.set(errno::EINVAL);
             -1