initial commit of lk (little kernel) project
diff --git a/lib/lwip/src/include/ipv4/lwip/ip.h b/lib/lwip/src/include/ipv4/lwip/ip.h
new file mode 100644
index 0000000..4c15e1a
--- /dev/null
+++ b/lib/lwip/src/include/ipv4/lwip/ip.h
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_IP_H__
+#define __LWIP_IP_H__
+
+#include "lwip/arch.h"
+
+#include "lwip/def.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+
+#include "lwip/err.h"
+
+
+void ip_init(void);
+struct netif *ip_route(struct ip_addr *dest);
+err_t ip_input(struct pbuf *p, struct netif *inp);
+err_t ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos, u8_t proto);
+err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos, u8_t proto,
+ struct netif *netif);
+
+#define IP_HLEN 20
+
+#define IP_PROTO_ICMP 1
+#define IP_PROTO_UDP 17
+#define IP_PROTO_UDPLITE 170
+#define IP_PROTO_TCP 6
+
+/* This is passed as the destination address to ip_output_if (not
+ to ip_output), meaning that an IP header already is constructed
+ in the pbuf. This is used when TCP retransmits. */
+#ifdef IP_HDRINCL
+#undef IP_HDRINCL
+#endif /* IP_HDRINCL */
+#define IP_HDRINCL NULL
+
+
+/* This is the common part of all PCB types. It needs to be at the
+ beginning of a PCB type definition. It is located here so that
+ changes to this common part are made in one location instead of
+ having to change all PCB structs. */
+#define IP_PCB struct ip_addr local_ip; \
+ struct ip_addr remote_ip; \
+ /* Socket options */ \
+ u16_t so_options; \
+ /* Type Of Service */ \
+ u8_t tos; \
+ /* Time To Live */ \
+ u8_t ttl
+
+/*
+ * Option flags per-socket. These are the same like SO_XXX.
+ */
+#define SOF_DEBUG (u16_t)0x0001U /* turn on debugging info recording */
+#define SOF_ACCEPTCONN (u16_t)0x0002U /* socket has had listen() */
+#define SOF_REUSEADDR (u16_t)0x0004U /* allow local address reuse */
+#define SOF_KEEPALIVE (u16_t)0x0008U /* keep connections alive */
+#define SOF_DONTROUTE (u16_t)0x0010U /* just use interface addresses */
+#define SOF_BROADCAST (u16_t)0x0020U /* permit sending of broadcast msgs */
+#define SOF_USELOOPBACK (u16_t)0x0040U /* bypass hardware when possible */
+#define SOF_LINGER (u16_t)0x0080U /* linger on close if data present */
+#define SOF_OOBINLINE (u16_t)0x0100U /* leave received OOB data in line */
+#define SOF_REUSEPORT (u16_t)0x0200U /* allow local address & port reuse */
+
+
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_hdr {
+ /* version / header length / type of service */
+ PACK_STRUCT_FIELD(u16_t _v_hl_tos);
+ /* total length */
+ PACK_STRUCT_FIELD(u16_t _len);
+ /* identification */
+ PACK_STRUCT_FIELD(u16_t _id);
+ /* fragment offset field */
+ PACK_STRUCT_FIELD(u16_t _offset);
+#define IP_RF 0x8000 /* reserved fragment flag */
+#define IP_DF 0x4000 /* dont fragment flag */
+#define IP_MF 0x2000 /* more fragments flag */
+#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
+ /* time to live / protocol*/
+ PACK_STRUCT_FIELD(u16_t _ttl_proto);
+ /* checksum */
+ PACK_STRUCT_FIELD(u16_t _chksum);
+ /* source and destination IP addresses */
+ PACK_STRUCT_FIELD(struct ip_addr src);
+ PACK_STRUCT_FIELD(struct ip_addr dest);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define IPH_V(hdr) (ntohs((hdr)->_v_hl_tos) >> 12)
+#define IPH_HL(hdr) ((ntohs((hdr)->_v_hl_tos) >> 8) & 0x0f)
+#define IPH_TOS(hdr) (ntohs((hdr)->_v_hl_tos) & 0xff)
+#define IPH_LEN(hdr) ((hdr)->_len)
+#define IPH_ID(hdr) ((hdr)->_id)
+#define IPH_OFFSET(hdr) ((hdr)->_offset)
+#define IPH_TTL(hdr) (ntohs((hdr)->_ttl_proto) >> 8)
+#define IPH_PROTO(hdr) (ntohs((hdr)->_ttl_proto) & 0xff)
+#define IPH_CHKSUM(hdr) ((hdr)->_chksum)
+
+#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos)))
+#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
+#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
+#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
+#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl_proto = (htons(IPH_PROTO(hdr) | ((ttl) << 8)))
+#define IPH_PROTO_SET(hdr, proto) (hdr)->_ttl_proto = (htons((proto) | (IPH_TTL(hdr) << 8)))
+#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
+
+#if IP_DEBUG
+void ip_debug_print(struct pbuf *p);
+#else
+#define ip_debug_print(p)
+#endif /* IP_DEBUG */
+
+#endif /* __LWIP_IP_H__ */
+
+