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/**
* @file
* IP API
*/
/*
* 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_HDR_IP_H
#define LWIP_HDR_IP_H
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"
#include "lwip/err.h"
#include "lwip/netif.h"
#include "lwip/ip4.h"
#include "lwip/ip6.h"
#include "lwip/prot/ip.h"
#ifdef __cplusplus
extern "C" {
#endif
/* 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. */
#define LWIP_IP_HDRINCL NULL
/** pbufs passed to IP must have a ref-count of 1 as their payload pointer
gets altered as the packet is passed down the stack */
#ifndef LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX
#define LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p) LWIP_ASSERT("p->ref == 1", (p)->ref == 1)
#endif
#if LWIP_NETIF_USE_HINTS
#define IP_PCB_NETIFHINT ;struct netif_hint netif_hints
#else /* LWIP_NETIF_USE_HINTS */
#define IP_PCB_NETIFHINT
#endif /* LWIP_NETIF_USE_HINTS */
/** 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 \
/* ip addresses in network byte order */ \
ip_addr_t local_ip; \
ip_addr_t remote_ip; \
/* Bound netif index */ \
u8_t netif_idx; \
/* Socket options */ \
u8_t so_options; \
/* Type Of Service */ \
u8_t tos; \
/* Time To Live */ \
u8_t ttl \
/* link layer address resolution hint */ \
IP_PCB_NETIFHINT
struct ip_pcb {
/* Common members of all PCB types */
IP_PCB;
};
/*
* Option flags per-socket. These are the same like SO_XXX in sockets.h
*/
#define SOF_REUSEADDR 0x04U /* allow local address reuse */
#define SOF_KEEPALIVE 0x08U /* keep connections alive */
#define SOF_BROADCAST 0x20U /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
/* These flags are inherited (e.g. from a listen-pcb to a connection-pcb): */
#define SOF_INHERITED (SOF_REUSEADDR|SOF_KEEPALIVE)
/** Global variables of this module, kept in a struct for efficient access using base+index. */
struct ip_globals
{
/** The interface that accepted the packet for the current callback invocation. */
struct netif *current_netif;
/** The interface that received the packet for the current callback invocation. */
struct netif *current_input_netif;
#if LWIP_IPV4
/** Header of the input packet currently being processed. */
const struct ip_hdr *current_ip4_header;
#endif /* LWIP_IPV4 */
#if LWIP_IPV6
/** Header of the input IPv6 packet currently being processed. */
struct ip6_hdr *current_ip6_header;
#endif /* LWIP_IPV6 */
/** Total header length of current_ip4/6_header (i.e. after this, the UDP/TCP header starts) */
u16_t current_ip_header_tot_len;
/** Source IP address of current_header */
ip_addr_t current_iphdr_src;
/** Destination IP address of current_header */
ip_addr_t current_iphdr_dest;
};
extern struct ip_globals ip_data;
/** Get the interface that accepted the current packet.
* This may or may not be the receiving netif, depending on your netif/network setup.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip_current_netif() (ip_data.current_netif)
/** Get the interface that received the current packet.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip_current_input_netif() (ip_data.current_input_netif)
/** Total header length of ip(6)_current_header() (i.e. after this, the UDP/TCP header starts) */
#define ip_current_header_tot_len() (ip_data.current_ip_header_tot_len)
/** Source IP address of current_header */
#define ip_current_src_addr() (&ip_data.current_iphdr_src)
/** Destination IP address of current_header */
#define ip_current_dest_addr() (&ip_data.current_iphdr_dest)
#if LWIP_IPV4 && LWIP_IPV6
/** Get the IPv4 header of the current packet.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip4_current_header() ip_data.current_ip4_header
/** Get the IPv6 header of the current packet.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip6_current_header() ((const struct ip6_hdr*)(ip_data.current_ip6_header))
/** Returns TRUE if the current IP input packet is IPv6, FALSE if it is IPv4 */
#define ip_current_is_v6() (ip6_current_header() != NULL)
/** Source IPv6 address of current_header */
#define ip6_current_src_addr() (ip_2_ip6(&ip_data.current_iphdr_src))
/** Destination IPv6 address of current_header */
#define ip6_current_dest_addr() (ip_2_ip6(&ip_data.current_iphdr_dest))
/** Get the transport layer protocol */
#define ip_current_header_proto() (ip_current_is_v6() ? \
IP6H_NEXTH(ip6_current_header()) :\
IPH_PROTO(ip4_current_header()))
/** Get the transport layer header */
#define ip_next_header_ptr() ((const void*)((ip_current_is_v6() ? \
(const u8_t*)ip6_current_header() : (const u8_t*)ip4_current_header()) + ip_current_header_tot_len()))
/** Source IP4 address of current_header */
#define ip4_current_src_addr() (ip_2_ip4(&ip_data.current_iphdr_src))
/** Destination IP4 address of current_header */
#define ip4_current_dest_addr() (ip_2_ip4(&ip_data.current_iphdr_dest))
#elif LWIP_IPV4 /* LWIP_IPV4 && LWIP_IPV6 */
/** Get the IPv4 header of the current packet.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip4_current_header() ip_data.current_ip4_header
/** Always returns FALSE when only supporting IPv4 only */
#define ip_current_is_v6() 0
/** Get the transport layer protocol */
#define ip_current_header_proto() IPH_PROTO(ip4_current_header())
/** Get the transport layer header */
#define ip_next_header_ptr() ((const void*)((const u8_t*)ip4_current_header() + ip_current_header_tot_len()))
/** Source IP4 address of current_header */
#define ip4_current_src_addr() (&ip_data.current_iphdr_src)
/** Destination IP4 address of current_header */
#define ip4_current_dest_addr() (&ip_data.current_iphdr_dest)
#elif LWIP_IPV6 /* LWIP_IPV4 && LWIP_IPV6 */
/** Get the IPv6 header of the current packet.
* This function must only be called from a receive callback (udp_recv,
* raw_recv, tcp_accept). It will return NULL otherwise. */
#define ip6_current_header() ((const struct ip6_hdr*)(ip_data.current_ip6_header))
/** Always returns TRUE when only supporting IPv6 only */
#define ip_current_is_v6() 1
/** Get the transport layer protocol */
#define ip_current_header_proto() IP6H_NEXTH(ip6_current_header())
/** Get the transport layer header */
#define ip_next_header_ptr() ((const void*)(((const u8_t*)ip6_current_header()) + ip_current_header_tot_len()))
/** Source IP6 address of current_header */
#define ip6_current_src_addr() (&ip_data.current_iphdr_src)
/** Destination IP6 address of current_header */
#define ip6_current_dest_addr() (&ip_data.current_iphdr_dest)
#endif /* LWIP_IPV6 */
/** Union source address of current_header */
#define ip_current_src_addr() (&ip_data.current_iphdr_src)
/** Union destination address of current_header */
#define ip_current_dest_addr() (&ip_data.current_iphdr_dest)
/** Gets an IP pcb option (SOF_* flags) */
#define ip_get_option(pcb, opt) ((pcb)->so_options & (opt))
/** Sets an IP pcb option (SOF_* flags) */
#define ip_set_option(pcb, opt) ((pcb)->so_options = (u8_t)((pcb)->so_options | (opt)))
/** Resets an IP pcb option (SOF_* flags) */
#define ip_reset_option(pcb, opt) ((pcb)->so_options = (u8_t)((pcb)->so_options & ~(opt)))
#if LWIP_IPV4 && LWIP_IPV6
/**
* @ingroup ip
* Output IP packet, netif is selected by source address
*/
#define ip_output(p, src, dest, ttl, tos, proto) \
(IP_IS_V6(dest) ? \
ip6_output(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto) : \
ip4_output(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto))
/**
* @ingroup ip
* Output IP packet to specified interface
*/
#define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
(IP_IS_V6(dest) ? \
ip6_output_if(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif) : \
ip4_output_if(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif))
/**
* @ingroup ip
* Output IP packet to interface specifying source address
*/
#define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
(IP_IS_V6(dest) ? \
ip6_output_if_src(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif) : \
ip4_output_if_src(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif))
/** Output IP packet that already includes an IP header. */
#define ip_output_if_hdrincl(p, src, dest, netif) \
(IP_IS_V6(dest) ? \
ip6_output_if(p, ip_2_ip6(src), LWIP_IP_HDRINCL, 0, 0, 0, netif) : \
ip4_output_if(p, ip_2_ip4(src), LWIP_IP_HDRINCL, 0, 0, 0, netif))
/** Output IP packet with netif_hint */
#define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
(IP_IS_V6(dest) ? \
ip6_output_hinted(p, ip_2_ip6(src), ip_2_ip6(dest), ttl, tos, proto, netif_hint) : \
ip4_output_hinted(p, ip_2_ip4(src), ip_2_ip4(dest), ttl, tos, proto, netif_hint))
/**
* @ingroup ip
* Get netif for address combination. See \ref ip6_route and \ref ip4_route
*/
#define ip_route(src, dest) \
(IP_IS_V6(dest) ? \
ip6_route(ip_2_ip6(src), ip_2_ip6(dest)) : \
ip4_route_src(ip_2_ip4(src), ip_2_ip4(dest)))
/**
* @ingroup ip
* Get netif for IP.
*/
#define ip_netif_get_local_ip(netif, dest) (IP_IS_V6(dest) ? \
ip6_netif_get_local_ip(netif, ip_2_ip6(dest)) : \
ip4_netif_get_local_ip(netif))
#define ip_debug_print(is_ipv6, p) ((is_ipv6) ? ip6_debug_print(p) : ip4_debug_print(p))
err_t ip_input(struct pbuf *p, struct netif *inp);
#elif LWIP_IPV4 /* LWIP_IPV4 && LWIP_IPV6 */
#define ip_output(p, src, dest, ttl, tos, proto) \
ip4_output(p, src, dest, ttl, tos, proto)
#define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
ip4_output_if(p, src, dest, ttl, tos, proto, netif)
#define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
ip4_output_if_src(p, src, dest, ttl, tos, proto, netif)
#define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
ip4_output_hinted(p, src, dest, ttl, tos, proto, netif_hint)
#define ip_output_if_hdrincl(p, src, dest, netif) \
ip4_output_if(p, src, LWIP_IP_HDRINCL, 0, 0, 0, netif)
#define ip_route(src, dest) \
ip4_route_src(src, dest)
#define ip_netif_get_local_ip(netif, dest) \
ip4_netif_get_local_ip(netif)
#define ip_debug_print(is_ipv6, p) ip4_debug_print(p)
#define ip_input ip4_input
#elif LWIP_IPV6 /* LWIP_IPV4 && LWIP_IPV6 */
#define ip_output(p, src, dest, ttl, tos, proto) \
ip6_output(p, src, dest, ttl, tos, proto)
#define ip_output_if(p, src, dest, ttl, tos, proto, netif) \
ip6_output_if(p, src, dest, ttl, tos, proto, netif)
#define ip_output_if_src(p, src, dest, ttl, tos, proto, netif) \
ip6_output_if_src(p, src, dest, ttl, tos, proto, netif)
#define ip_output_hinted(p, src, dest, ttl, tos, proto, netif_hint) \
ip6_output_hinted(p, src, dest, ttl, tos, proto, netif_hint)
#define ip_output_if_hdrincl(p, src, dest, netif) \
ip6_output_if(p, src, LWIP_IP_HDRINCL, 0, 0, 0, netif)
#define ip_route(src, dest) \
ip6_route(src, dest)
#define ip_netif_get_local_ip(netif, dest) \
ip6_netif_get_local_ip(netif, dest)
#define ip_debug_print(is_ipv6, p) ip6_debug_print(p)
#define ip_input ip6_input
#endif /* LWIP_IPV6 */
#define ip_route_get_local_ip(src, dest, netif, ipaddr) do { \
(netif) = ip_route(src, dest); \
(ipaddr) = ip_netif_get_local_ip(netif, dest); \
}while(0)
#ifdef __cplusplus
}
#endif
#endif /* LWIP_HDR_IP_H */