diff --git a/libc/include/netinet/ip_icmp.h b/libc/include/netinet/ip_icmp.h
new file mode 100644
index 0000000..7510592
--- /dev/null
+++ b/libc/include/netinet/ip_icmp.h
@@ -0,0 +1,214 @@
+/*	$OpenBSD: ip_icmp.h,v 1.21 2005/07/31 03:30:55 pascoe Exp $	*/
+/*	$NetBSD: ip_icmp.h,v 1.10 1996/02/13 23:42:28 christos Exp $	*/
+
+/*
+ * Copyright (c) 1982, 1986, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)ip_icmp.h	8.1 (Berkeley) 6/10/93
+ */
+
+#ifndef _NETINET_IP_ICMP_H_
+#define _NETINET_IP_ICMP_H_
+
+#include <netinet/ip.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/*
+ * Interface Control Message Protocol Definitions.
+ * Per RFC 792, September 1981.
+ * RFC 950, August 1985. (Address Mask Request / Reply)
+ * RFC 1256, September 1991. (Router Advertisement and Solicitation)
+ * RFC 1108, November 1991. (Param Problem, Missing Req. Option)
+ * RFC 1393, January 1993. (Traceroute)
+ * RFC 1475, June 1993. (Datagram Conversion Error)
+ * RFC 1812, June 1995. (adm prohib, host precedence, precedence cutoff)
+ * RFC 2002, October 1996. (Mobility changes to Router Advertisement)
+ */
+
+/*
+ * ICMP Router Advertisement data
+ */
+struct icmp_ra_addr {
+	uint32_t  ira_addr;
+	uint32_t  ira_preference;
+};
+
+/*
+ * Structure of an icmp header.
+ */
+struct icmp {
+	uint8_t  icmp_type;		/* type of message, see below */
+	uint8_t  icmp_code;		/* type sub code */
+	uint16_t icmp_cksum;		/* ones complement cksum of struct */
+	union {
+		uint8_t   ih_pptr;		/* ICMP_PARAMPROB */
+		struct in_addr ih_gwaddr;	/* ICMP_REDIRECT */
+		struct ih_idseq {
+			  uint16_t  icd_id;
+			  uint16_t  icd_seq;
+		} ih_idseq;
+		int32_t   ih_void;
+
+		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
+		struct ih_pmtu {
+			  uint16_t  ipm_void;
+			  uint16_t  ipm_nextmtu;
+		} ih_pmtu;
+
+		struct ih_rtradv {
+			uint8_t   irt_num_addrs;
+			uint8_t   irt_wpa;
+			uint16_t  irt_lifetime;
+		} ih_rtradv;
+	} icmp_hun;
+#define	icmp_pptr	  icmp_hun.ih_pptr
+#define	icmp_gwaddr	  icmp_hun.ih_gwaddr
+#define	icmp_id		  icmp_hun.ih_idseq.icd_id
+#define	icmp_seq	  icmp_hun.ih_idseq.icd_seq
+#define	icmp_void	  icmp_hun.ih_void
+#define	icmp_pmvoid	  icmp_hun.ih_pmtu.ipm_void
+#define	icmp_nextmtu	  icmp_hun.ih_pmtu.ipm_nextmtu
+#define	icmp_num_addrs	  icmp_hun.ih_rtradv.irt_num_addrs
+#define	icmp_wpa	  icmp_hun.ih_rtradv.irt_wpa
+#define	icmp_lifetime	  icmp_hun.ih_rtradv.irt_lifetime
+	union {
+		struct id_ts {
+			  uint32_t  its_otime;
+			  uint32_t  its_rtime;
+			  uint32_t  its_ttime;
+		} id_ts;
+		struct id_ip  {
+			  struct ip idi_ip;
+			  /* options and then 64 bits of data */
+		} id_ip;
+		uint32_t  id_mask;
+		int8_t	  id_data[1];
+	} icmp_dun;
+#define	icmp_otime	  icmp_dun.id_ts.its_otime
+#define	icmp_rtime	  icmp_dun.id_ts.its_rtime
+#define	icmp_ttime	  icmp_dun.id_ts.its_ttime
+#define	icmp_ip		  icmp_dun.id_ip.idi_ip
+#define	icmp_mask	  icmp_dun.id_mask
+#define	icmp_data	  icmp_dun.id_data
+};
+
+/*
+ * For IPv6 transition related ICMP errors.
+ */
+#define	ICMP_V6ADVLENMIN	(8 + sizeof(struct ip) + 40)
+#define	ICMP_V6ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 40)
+
+/*
+ * Lower bounds on packet lengths for various types.
+ * For the error advice packets must first insure that the
+ * packet is large enough to contain the returned ip header.
+ * Only then can we do the check to see if 64 bits of packet
+ * data have been returned, since we need to check the returned
+ * ip header length.
+ */
+#define	ICMP_MINLEN	8				/* abs minimum */
+#define	ICMP_TSLEN	(8 + 3 * sizeof (n_time))	/* timestamp */
+#define	ICMP_MASKLEN	12				/* address mask */
+#define	ICMP_ADVLENMIN	(8 + sizeof (struct ip) + 8)	/* min */
+#define	ICMP_ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 8)
+	/* N.B.: must separately check that ip_hl >= 5 */
+
+/*
+ * Definition of type and code field values.
+ *	http://www.iana.org/assignments/icmp-parameters
+ */
+#define	ICMP_ECHOREPLY		0		/* echo reply */
+#define	ICMP_UNREACH		3		/* dest unreachable, codes: */
+#define	ICMP_UNREACH_NET		0	/* bad net */
+#define	ICMP_UNREACH_HOST		1	/* bad host */
+#define	ICMP_UNREACH_PROTOCOL		2	/* bad protocol */
+#define	ICMP_UNREACH_PORT		3	/* bad port */
+#define	ICMP_UNREACH_NEEDFRAG		4	/* IP_DF caused drop */
+#define	ICMP_UNREACH_SRCFAIL		5	/* src route failed */
+#define	ICMP_UNREACH_NET_UNKNOWN	6	/* unknown net */
+#define	ICMP_UNREACH_HOST_UNKNOWN	7	/* unknown host */
+#define	ICMP_UNREACH_ISOLATED		8	/* src host isolated */
+#define	ICMP_UNREACH_NET_PROHIB		9	/* for crypto devs */
+#define	ICMP_UNREACH_HOST_PROHIB	10	/* ditto */
+#define	ICMP_UNREACH_TOSNET		11	/* bad tos for net */
+#define	ICMP_UNREACH_TOSHOST		12	/* bad tos for host */
+#define	ICMP_UNREACH_FILTER_PROHIB	13	/* prohibited access */
+#define	ICMP_UNREACH_HOST_PRECEDENCE	14	/* precedence violat'n*/
+#define	ICMP_UNREACH_PRECEDENCE_CUTOFF	15	/* precedence cutoff */
+#define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */
+#define	ICMP_REDIRECT		5		/* shorter route, codes: */
+#define	ICMP_REDIRECT_NET	0		/* for network */
+#define	ICMP_REDIRECT_HOST	1		/* for host */
+#define	ICMP_REDIRECT_TOSNET	2		/* for tos and net */
+#define	ICMP_REDIRECT_TOSHOST	3		/* for tos and host */
+#define	ICMP_ALTHOSTADDR	6		/* alternate host address */
+#define	ICMP_ECHO		8		/* echo service */
+#define	ICMP_ROUTERADVERT	9		/* router advertisement */
+#define	ICMP_ROUTERADVERT_NORMAL		0	/* normal advertisement */
+#define	ICMP_ROUTERADVERT_NOROUTE_COMMON	16	/* selective routing */
+#define	ICMP_ROUTERSOLICIT	10		/* router solicitation */
+#define	ICMP_TIMXCEED		11		/* time exceeded, code: */
+#define	ICMP_TIMXCEED_INTRANS	0		/* ttl==0 in transit */
+#define	ICMP_TIMXCEED_REASS	1		/* ttl==0 in reass */
+#define	ICMP_PARAMPROB		12		/* ip header bad */
+#define	ICMP_PARAMPROB_ERRATPTR 0		/* req. opt. absent */
+#define	ICMP_PARAMPROB_OPTABSENT 1		/* req. opt. absent */
+#define	ICMP_PARAMPROB_LENGTH	2		/* bad length */
+#define	ICMP_TSTAMP		13		/* timestamp request */
+#define	ICMP_TSTAMPREPLY	14		/* timestamp reply */
+#define	ICMP_IREQ		15		/* information request */
+#define	ICMP_IREQREPLY		16		/* information reply */
+#define	ICMP_MASKREQ		17		/* address mask request */
+#define	ICMP_MASKREPLY		18		/* address mask reply */
+#define	ICMP_TRACEROUTE		30		/* traceroute */
+#define	ICMP_DATACONVERR	31		/* data conversion error */
+#define	ICMP_MOBILE_REDIRECT	32		/* mobile host redirect */
+#define	ICMP_IPV6_WHEREAREYOU	33		/* IPv6 where-are-you */
+#define	ICMP_IPV6_IAMHERE	34		/* IPv6 i-am-here */
+#define	ICMP_MOBILE_REGREQUEST	35		/* mobile registration req */
+#define	ICMP_MOBILE_REGREPLY	36		/* mobile registration reply */
+#define	ICMP_SKIP		39		/* SKIP */
+#define	ICMP_PHOTURIS		40		/* Photuris */
+#define	ICMP_PHOTURIS_UNKNOWN_INDEX	1	/* unknown sec index */
+#define	ICMP_PHOTURIS_AUTH_FAILED	2	/* auth failed */
+#define	ICMP_PHOTURIS_DECRYPT_FAILED	3	/* decrypt failed */
+
+#define	ICMP_MAXTYPE		40
+
+#define	ICMP_INFOTYPE(type) \
+	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
+	(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
+	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
+	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
+	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
+
+__END_DECLS
+
+#endif /* _NETINET_IP_ICMP_H_ */