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nuttx/include/net/uip/uip-igmp.h
patacongo 1aac40d813 More IGMP logic 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2779 42af7a65-404d-4744-a932-0658087f49c3
2010-07-08 03:04:04 +00:00

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/****************************************************************************
* net/uip/uip-igmp.h
* The definitions in this header file are intended only for internal use
* by the NuttX port of the uIP stack.
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
* lwIP TCP/IP stack by Steve Reynolds:
*
* Copyright (c) 2002 CITEL Technologies Ltd.
* 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 CITEL Technologies Ltd 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 CITEL TECHNOLOGIES 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 CITEL TECHNOLOGIES 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.
*
****************************************************************************/
#ifndef __NET_UIP_IGMP_H
#define __NET_UIP_IGMP_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <wdog.h>
#include <netinet/in.h>
#include <net/uip/uip.h>
#include <net/uip/uip-arch.h>
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef CONFIG_NET_IPv6
# error "IGMP for IPv6 not supported"
#endif
/* IGMP packet types */
#define IGMP_MEMBERSHIP_QUERY 0x11 /* Membership Query */
#define IGMPv1_MEMBERSHIP_REPORT 0x12 /* IGMP Ver. 1 Membership Report */
#define IGMPv2_MEMBERSHIP_REPORT 0x16 /* IGMP Ver. 2 Membership Report */
#define IGMPv3_MEMBERSHIP_REPORT 0x22 /* IGMP Ver. 3 Membership Report */
#define IGMP_LEAVE_GROUP 0x17 /* Leave Group */
/* Header sizes:
*
* UIP_IGMPH_LEN - Size of IGMP header in bytes
* UIP_IPIGMPH_LEN - Size of IP + IGMP header
*/
#define UIP_IGMPH_LEN 8
#define UIP_IPIGMPH_LEN (UIP_IGMPH_LEN + UIP_IPH_LEN)
/* Group membership states */
#define IGMP_NON_MEMBER 0
#define IGMP_DELAYING_MEMBER 1
#define IGMP_IDLE_MEMBER 2
/* Group flags */
#define IGMP_PREALLOCATED 1
#define IGMP_LASTREPORT 2
#define SET_PREALLOCATED(f) do { (f) |= IGMP_PREALLOCATED; } while (0)
#define SET_LASTREPORT(f) do { (f) |= IGMP_LASTREPORT; } while (0)
#define CLR_PREALLOCATED(f) do { (f) &= ~IGMP_PREALLOCATED; } while (0)
#define CLR_LASTREPORT(f) do { (f) &= ~IGMP_LASTREPORT; } while (0)
#define IS_PREALLOCATED(f) (((f) & IGMP_PREALLOCATED) != 0)
#define IS_LASTREPORT(f) (((f) & IGMP_LASTREPORT) != 0)
/****************************************************************************
* Public Types
****************************************************************************/
/* IGMPv2 packet structure as defined by RFC 2236.
*
* The Max Respone Time (maxresp) specifies the time limit for the
* corresponding report. The field has a resolution of 100 miliseconds, the
* value is taken directly. This field is meaningful only in Membership Query
* (0x11); in other messages it is set to 0 and ignored by the receiver.
*/
struct uip_igmphdr_s
{
#ifdef CONFIG_NET_IPv6
/* IPv6 Ip header */
uint8_t vtc; /* Bits 0-3: version, bits 4-7: traffic class (MS) */
uint8_t tcf; /* Bits 0-3: traffic class (LS), bits 4-7: flow label (MS) */
uint16_t flow; /* 16-bit flow label (LS) */
uint8_t len[2]; /* 16-bit Payload length */
uint8_t proto; /* 8-bit Next header (same as IPv4 protocol field) */
uint8_t ttl; /* 8-bit Hop limit (like IPv4 TTL field) */
uip_ip6addr_t srcipaddr; /* 128-bit Source address */
uip_ip6addr_t destipaddr; /* 128-bit Destination address */
#else /* CONFIG_NET_IPv6 */
/* IPv4 IP header */
uint8_t vhl; /* 8-bit Version (4) and header length (5 or 6) */
uint8_t tos; /* 8-bit Type of service (e.g., 6=TCP) */
uint8_t len[2]; /* 16-bit Total length */
uint8_t ipid[2]; /* 16-bit Identification */
uint8_t ipoffset[2]; /* 16-bit IP flags + fragment offset */
uint8_t ttl; /* 8-bit Time to Live */
uint8_t proto; /* 8-bit Protocol */
uint16_t ipchksum; /* 16-bit Header checksum */
uint16_t srcipaddr[2]; /* 32-bit Source IP address */
uint16_t destipaddr[2]; /* 32-bit Destination IP address */
#endif /* CONFIG_NET_IPv6 */
/* IGMP header */
uint8_t type; /* 8-bit IGMP packet type */
uint8_t maxresp; /* 8-bit Max response time */
uint16_t chksum; /* 16-bit Checksum */
uint16_t grpaddr[2]; /* 32-bit Group address */
};
#ifdef CONFIG_NET_IGMP_STATS
struct igmp_stats_s
{
uint32_t length_errors;
uint32_t chksum_errors;
uint32_t v1_received;
uint32_t joins;
uint32_t leave_sent;
uint32_t ucast_query;
uint32_t report_sent;
uint32_t query_received;
uint32_t report_received;
};
# define IGMP_STATINCR(p) ((p)++)
#else
# define IGMP_STATINCR(p)
#endif
/* This structure represents one group member. There is a list of groups
* for each device interface structure.
*
* There will be a group for the all systems group address but this
* will not run the state machine as it is used to kick off reports
* from all the other groups
*/
struct igmp_group_s
{
struct igmp_group_s *next; /* Implements a singly-linked list */
uip_ipaddr_t grpaddr; /* Group IP address */
WDOG_ID wdog; /* WDOG used to detect timeouts */
uint8_t flags; /* See IGMP_ flags definitions */
uint8_t state; /* State of the group */
uint8_t msgid; /* Pending message ID (if non-zero) */
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
#ifdef CONFIG_NET_IGMP_STATS
struct igmp_stats_s g_igmpstats;
#endif
extern uip_ipaddr_t g_allsystems;
extern uip_ipaddr_t g_allrouters;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: uip_igmpdevinit
*
* Description:
* Called when a new network device is registered to configure that device
* for IGMP support.
*
****************************************************************************/
EXTERN void uip_igmpdevinit(struct uip_driver_s *dev);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* CONFIG_NET_IGMP */
#endif /* __NET_UIP_IGMP_H */
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