ip.h

00001 /*
00002  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
00003  * All rights reserved. 
00004  * 
00005  * Redistribution and use in source and binary forms, with or without modification, 
00006  * are permitted provided that the following conditions are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright notice,
00009  *    this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright notice,
00011  *    this list of conditions and the following disclaimer in the documentation
00012  *    and/or other materials provided with the distribution.
00013  * 3. The name of the author may not be used to endorse or promote products
00014  *    derived from this software without specific prior written permission. 
00015  *
00016  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
00017  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00018  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00019  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00020  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00021  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00024  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00025  * OF SUCH DAMAGE.
00026  *
00027  * This file is part of the lwIP TCP/IP stack.
00028  * 
00029  * Author: Adam Dunkels <adam@sics.se>
00030  *
00031  */
00032 #ifndef __LWIP_IP_H__
00033 #define __LWIP_IP_H__
00034 
00035 #include "lwip/opt.h"
00036 
00037 #include "lwip/def.h"
00038 #include "lwip/pbuf.h"
00039 #include "lwip/ip_addr.h"
00040 #include "lwip/err.h"
00041 #include "lwip/netif.h"
00042 
00043 #ifdef __cplusplus
00044 extern "C" {
00045 #endif
00046 
00047 /** Currently, the function ip_output_if_opt() is only used with IGMP */
00048 #define IP_OPTIONS_SEND   LWIP_IGMP
00049 
00050 #define IP_HLEN 20
00051 
00052 #define IP_PROTO_ICMP    1
00053 #define IP_PROTO_IGMP    2
00054 #define IP_PROTO_UDP     17
00055 #define IP_PROTO_UDPLITE 136
00056 #define IP_PROTO_TCP     6
00057 
00058 /* This is passed as the destination address to ip_output_if (not
00059    to ip_output), meaning that an IP header already is constructed
00060    in the pbuf. This is used when TCP retransmits. */
00061 #ifdef IP_HDRINCL
00062 #undef IP_HDRINCL
00063 #endif /* IP_HDRINCL */
00064 #define IP_HDRINCL  NULL
00065 
00066 #if LWIP_NETIF_HWADDRHINT
00067 #define IP_PCB_ADDRHINT ;u8_t addr_hint
00068 #else
00069 #define IP_PCB_ADDRHINT
00070 #endif /* LWIP_NETIF_HWADDRHINT */
00071 
00072 /* This is the common part of all PCB types. It needs to be at the
00073    beginning of a PCB type definition. It is located here so that
00074    changes to this common part are made in one location instead of
00075    having to change all PCB structs. */
00076 #define IP_PCB \
00077   /* ip addresses in network byte order */ \
00078   ip_addr_t local_ip; \
00079   ip_addr_t remote_ip; \
00080    /* Socket options */  \
00081   u16_t so_options;      \
00082    /* Type Of Service */ \
00083   u8_t tos;              \
00084   /* Time To Live */     \
00085   u8_t ttl               \
00086   /* link layer address resolution hint */ \
00087   IP_PCB_ADDRHINT
00088 
00089 struct ip_pcb {
00090 /* Common members of all PCB types */
00091   IP_PCB;
00092 };
00093 
00094 /*
00095  * Option flags per-socket. These are the same like SO_XXX.
00096  */
00097 #define SOF_DEBUG       (u16_t)0x0001U    /* turn on debugging info recording */
00098 #define SOF_ACCEPTCONN  (u16_t)0x0002U    /* socket has had listen() */
00099 #define SOF_REUSEADDR   (u16_t)0x0004U    /* allow local address reuse */
00100 #define SOF_KEEPALIVE   (u16_t)0x0008U    /* keep connections alive */
00101 #define SOF_DONTROUTE   (u16_t)0x0010U    /* just use interface addresses */
00102 #define SOF_BROADCAST   (u16_t)0x0020U    /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
00103 #define SOF_USELOOPBACK (u16_t)0x0040U    /* bypass hardware when possible */
00104 #define SOF_LINGER      (u16_t)0x0080U    /* linger on close if data present */
00105 #define SOF_OOBINLINE   (u16_t)0x0100U    /* leave received OOB data in line */
00106 #define SOF_REUSEPORT   (u16_t)0x0200U    /* allow local address & port reuse */
00107 
00108 
00109 #ifdef PACK_STRUCT_USE_INCLUDES
00110 #  include "arch/bpstruct.h"
00111 #endif
00112 PACK_STRUCT_BEGIN
00113 struct ip_hdr {
00114   /* version / header length / type of service */
00115   PACK_STRUCT_FIELD(u16_t _v_hl_tos);
00116   /* total length */
00117   PACK_STRUCT_FIELD(u16_t _len);
00118   /* identification */
00119   PACK_STRUCT_FIELD(u16_t _id);
00120   /* fragment offset field */
00121   PACK_STRUCT_FIELD(u16_t _offset);
00122 #define IP_RF 0x8000        /* reserved fragment flag */
00123 #define IP_DF 0x4000        /* dont fragment flag */
00124 #define IP_MF 0x2000        /* more fragments flag */
00125 #define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
00126   /* time to live */
00127   PACK_STRUCT_FIELD(u8_t _ttl);
00128   /* protocol*/
00129   PACK_STRUCT_FIELD(u8_t _proto);
00130   /* checksum */
00131   PACK_STRUCT_FIELD(u16_t _chksum);
00132   /* source and destination IP addresses */
00133   PACK_STRUCT_FIELD(ip_addr_t src);
00134   PACK_STRUCT_FIELD(ip_addr_t dest); 
00135 } PACK_STRUCT_STRUCT;
00136 PACK_STRUCT_END
00137 #ifdef PACK_STRUCT_USE_INCLUDES
00138 #  include "arch/epstruct.h"
00139 #endif
00140 
00141 #define IPH_V(hdr)  (ntohs((hdr)->_v_hl_tos) >> 12)
00142 #define IPH_HL(hdr) ((ntohs((hdr)->_v_hl_tos) >> 8) & 0x0f)
00143 #define IPH_TOS(hdr) (ntohs((hdr)->_v_hl_tos) & 0xff)
00144 #define IPH_LEN(hdr) ((hdr)->_len)
00145 #define IPH_ID(hdr) ((hdr)->_id)
00146 #define IPH_OFFSET(hdr) ((hdr)->_offset)
00147 #define IPH_TTL(hdr) ((hdr)->_ttl)
00148 #define IPH_PROTO(hdr) ((hdr)->_proto)
00149 #define IPH_CHKSUM(hdr) ((hdr)->_chksum)
00150 
00151 #define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos)))
00152 #define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
00153 #define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
00154 #define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
00155 #define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
00156 #define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
00157 #define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
00158 
00159 /** The interface that provided the packet for the current callback invocation. */
00160 extern struct netif *current_netif;
00161 /** Header of the input packet currently being processed. */
00162 extern const struct ip_hdr *current_header;
00163 
00164 #define ip_init() /* Compatibility define, not init needed. */
00165 struct netif *ip_route(ip_addr_t *dest);
00166 err_t ip_input(struct pbuf *p, struct netif *inp);
00167 err_t ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
00168        u8_t ttl, u8_t tos, u8_t proto);
00169 err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
00170        u8_t ttl, u8_t tos, u8_t proto,
00171        struct netif *netif);
00172 #if LWIP_NETIF_HWADDRHINT
00173 err_t ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
00174        u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint);
00175 #endif /* LWIP_NETIF_HWADDRHINT */
00176 #if IP_OPTIONS_SEND
00177 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
00178        u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
00179        u16_t optlen);
00180 #endif /* IP_OPTIONS_SEND */
00181 /** Get the interface that received the current packet.
00182  * This function must only be called from a receive callback (udp_recv,
00183  * raw_recv, tcp_accept). It will return NULL otherwise. */
00184 #define ip_current_netif()  (current_netif)
00185 /** Get the IP header of the current packet.
00186  * This function must only be called from a receive callback (udp_recv,
00187  * raw_recv, tcp_accept). It will return NULL otherwise. */
00188 #define ip_current_header() (current_header)
00189 #if IP_DEBUG
00190 void ip_debug_print(struct pbuf *p);
00191 #else
00192 #define ip_debug_print(p)
00193 #endif /* IP_DEBUG */
00194 
00195 #ifdef __cplusplus
00196 }
00197 #endif
00198 
00199 #endif /* __LWIP_IP_H__ */
00200 
00201