diff --git a/libc/kernel/common/linux/in.h b/libc/kernel/common/linux/in.h
new file mode 100644
index 0000000..894e2da
--- /dev/null
+++ b/libc/kernel/common/linux/in.h
@@ -0,0 +1,211 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_IN_H
+#define _LINUX_IN_H
+
+#include <linux/types.h>
+#include <linux/socket.h>
+
+enum {
+ IPPROTO_IP = 0,
+ IPPROTO_ICMP = 1,
+ IPPROTO_IGMP = 2,
+ IPPROTO_IPIP = 4,
+ IPPROTO_TCP = 6,
+ IPPROTO_EGP = 8,
+ IPPROTO_PUP = 12,
+ IPPROTO_UDP = 17,
+ IPPROTO_IDP = 22,
+ IPPROTO_DCCP = 33,
+ IPPROTO_RSVP = 46,
+ IPPROTO_GRE = 47,
+
+ IPPROTO_IPV6 = 41,
+
+ IPPROTO_ESP = 50,
+ IPPROTO_AH = 51,
+ IPPROTO_PIM = 103,
+
+ IPPROTO_COMP = 108,
+ IPPROTO_SCTP = 132,
+
+ IPPROTO_RAW = 255,
+ IPPROTO_MAX
+};
+
+struct in_addr {
+ __u32 s_addr;
+};
+
+#define IP_TOS 1
+#define IP_TTL 2
+#define IP_HDRINCL 3
+#define IP_OPTIONS 4
+#define IP_ROUTER_ALERT 5
+#define IP_RECVOPTS 6
+#define IP_RETOPTS 7
+#define IP_PKTINFO 8
+#define IP_PKTOPTIONS 9
+#define IP_MTU_DISCOVER 10
+#define IP_RECVERR 11
+#define IP_RECVTTL 12
+#define IP_RECVTOS 13
+#define IP_MTU 14
+#define IP_FREEBIND 15
+#define IP_IPSEC_POLICY 16
+#define IP_XFRM_POLICY 17
+#define IP_PASSSEC 18
+
+#define IP_RECVRETOPTS IP_RETOPTS
+
+#define IP_PMTUDISC_DONT 0  
+#define IP_PMTUDISC_WANT 1  
+#define IP_PMTUDISC_DO 2  
+
+#define IP_MULTICAST_IF 32
+#define IP_MULTICAST_TTL 33
+#define IP_MULTICAST_LOOP 34
+#define IP_ADD_MEMBERSHIP 35
+#define IP_DROP_MEMBERSHIP 36
+#define IP_UNBLOCK_SOURCE 37
+#define IP_BLOCK_SOURCE 38
+#define IP_ADD_SOURCE_MEMBERSHIP 39
+#define IP_DROP_SOURCE_MEMBERSHIP 40
+#define IP_MSFILTER 41
+#define MCAST_JOIN_GROUP 42
+#define MCAST_BLOCK_SOURCE 43
+#define MCAST_UNBLOCK_SOURCE 44
+#define MCAST_LEAVE_GROUP 45
+#define MCAST_JOIN_SOURCE_GROUP 46
+#define MCAST_LEAVE_SOURCE_GROUP 47
+#define MCAST_MSFILTER 48
+
+#define MCAST_EXCLUDE 0
+#define MCAST_INCLUDE 1
+
+#define IP_DEFAULT_MULTICAST_TTL 1
+#define IP_DEFAULT_MULTICAST_LOOP 1
+
+struct ip_mreq
+{
+ struct in_addr imr_multiaddr;
+ struct in_addr imr_interface;
+};
+
+struct ip_mreqn
+{
+ struct in_addr imr_multiaddr;
+ struct in_addr imr_address;
+ int imr_ifindex;
+};
+
+struct ip_mreq_source {
+ __u32 imr_multiaddr;
+ __u32 imr_interface;
+ __u32 imr_sourceaddr;
+};
+
+struct ip_msfilter {
+ __u32 imsf_multiaddr;
+ __u32 imsf_interface;
+ __u32 imsf_fmode;
+ __u32 imsf_numsrc;
+ __u32 imsf_slist[1];
+};
+
+#define IP_MSFILTER_SIZE(numsrc)   (sizeof(struct ip_msfilter) - sizeof(__u32)   + (numsrc) * sizeof(__u32))
+
+struct group_req
+{
+ __u32 gr_interface;
+ struct __kernel_sockaddr_storage gr_group;
+};
+
+struct group_source_req
+{
+ __u32 gsr_interface;
+ struct __kernel_sockaddr_storage gsr_group;
+ struct __kernel_sockaddr_storage gsr_source;
+};
+
+struct group_filter
+{
+ __u32 gf_interface;
+ struct __kernel_sockaddr_storage gf_group;
+ __u32 gf_fmode;
+ __u32 gf_numsrc;
+ struct __kernel_sockaddr_storage gf_slist[1];
+};
+
+#define GROUP_FILTER_SIZE(numsrc)   (sizeof(struct group_filter) - sizeof(struct __kernel_sockaddr_storage)   + (numsrc) * sizeof(struct __kernel_sockaddr_storage))
+
+struct in_pktinfo
+{
+ int ipi_ifindex;
+ struct in_addr ipi_spec_dst;
+ struct in_addr ipi_addr;
+};
+
+#define __SOCK_SIZE__ 16  
+struct sockaddr_in {
+ sa_family_t sin_family;
+ unsigned short int sin_port;
+ struct in_addr sin_addr;
+
+ unsigned char __pad[__SOCK_SIZE__ - sizeof(short int) -
+ sizeof(unsigned short int) - sizeof(struct in_addr)];
+};
+#define sin_zero __pad  
+
+#define IN_CLASSA(a) ((((long int) (a)) & 0x80000000) == 0)
+#define IN_CLASSA_NET 0xff000000
+#define IN_CLASSA_NSHIFT 24
+#define IN_CLASSA_HOST (0xffffffff & ~IN_CLASSA_NET)
+#define IN_CLASSA_MAX 128
+
+#define IN_CLASSB(a) ((((long int) (a)) & 0xc0000000) == 0x80000000)
+#define IN_CLASSB_NET 0xffff0000
+#define IN_CLASSB_NSHIFT 16
+#define IN_CLASSB_HOST (0xffffffff & ~IN_CLASSB_NET)
+#define IN_CLASSB_MAX 65536
+
+#define IN_CLASSC(a) ((((long int) (a)) & 0xe0000000) == 0xc0000000)
+#define IN_CLASSC_NET 0xffffff00
+#define IN_CLASSC_NSHIFT 8
+#define IN_CLASSC_HOST (0xffffffff & ~IN_CLASSC_NET)
+
+#define IN_CLASSD(a) ((((long int) (a)) & 0xf0000000) == 0xe0000000)
+#define IN_MULTICAST(a) IN_CLASSD(a)
+#define IN_MULTICAST_NET 0xF0000000
+
+#define IN_EXPERIMENTAL(a) ((((long int) (a)) & 0xf0000000) == 0xf0000000)
+#define IN_BADCLASS(a) IN_EXPERIMENTAL((a))
+
+#define INADDR_ANY ((unsigned long int) 0x00000000)
+
+#define INADDR_BROADCAST ((unsigned long int) 0xffffffff)
+
+#define INADDR_NONE ((unsigned long int) 0xffffffff)
+
+#define IN_LOOPBACKNET 127
+
+#define INADDR_LOOPBACK 0x7f000001  
+#define IN_LOOPBACK(a) ((((long int) (a)) & 0xff000000) == 0x7f000000)
+
+#define INADDR_UNSPEC_GROUP 0xe0000000U  
+#define INADDR_ALLHOSTS_GROUP 0xe0000001U  
+#define INADDR_ALLRTRS_GROUP 0xe0000002U  
+#define INADDR_MAX_LOCAL_GROUP 0xe00000ffU  
+
+#include <asm/byteorder.h> 
+
+#endif