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px4-firmware/nuttx/net/uip/uip_igmpsend.c

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/****************************************************************************
* net/uip/uip_igmpsend.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/net/uip/uipopt.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-arch.h>
#include <nuttx/net/uip/uip-ipopt.h>
#include <nuttx/net/uip/uip-igmp.h>
#include "uip_internal.h"
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Debug */
#undef IGMP_DUMPPKT /* Define to enable packet dump */
#ifndef CONFIG_DEBUG_NET
# undef IGMP_DUMPPKT
#endif
#ifdef IGMP_DUMPPKT
# define igmp_dumppkt(b,n) lib_dumpbuffer("IGMP", (FAR const uint8_t*)(b), (n))
#else
# define igmp_dumppkt(b,n)
#endif
/* Buffer layout */
#define RASIZE (4)
#define IGMPBUF ((struct uip_igmphdr_s *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
static uint16_t uip_igmpchksum(FAR uint8_t *buffer, int buflen)
{
uint16_t sum = uip_chksum((FAR uint16_t*)buffer, buflen);
return sum ? sum : 0xffff;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_igmpsend
*
* Description:
* Sends an IGMP IP packet on a network interface. This function constructs
* the IP header and calculates the IP header checksum.
*
* Parameters:
* dev - The device driver structure to use in the send operation.
* group - Describes the multicast group member and identifies the message
* to be sent.
* destipaddr - The IP address of the recipient of the message
*
* Return:
* None
*
* Assumptions:
* Called from the interrupt level or with interrupts disabled.
*
****************************************************************************/
void uip_igmpsend(FAR struct uip_driver_s *dev, FAR struct igmp_group_s *group,
FAR uip_ipaddr_t *destipaddr)
{
nllvdbg("msgid: %02x destipaddr: %08x\n", group->msgid, (int)*destipaddr);
/* The total length to send is the size of the IP and IGMP headers and 4
* bytes for the ROUTER ALERT (and, eventually, the ethernet header)
*/
dev->d_len = UIP_IPIGMPH_LEN;
/* The total size of the data is the size of the IGMP header */
dev->d_sndlen = UIP_IGMPH_LEN;
/* Add the router alert option */
IGMPBUF->ra[0] = HTONS(IPOPT_RA >> 16);
IGMPBUF->ra[1] = HTONS(IPOPT_RA & 0xffff);
/* Initialize the IPv4 header */
IGMPBUF->vhl = 0x46; /* 4->IP; 6->24 bytes */
IGMPBUF->tos = 0;
IGMPBUF->len[0] = (dev->d_len >> 8);
IGMPBUF->len[1] = (dev->d_len & 0xff);
++g_ipid;
IGMPBUF->ipid[0] = g_ipid >> 8;
IGMPBUF->ipid[1] = g_ipid & 0xff;
IGMPBUF->ipoffset[0] = UIP_TCPFLAG_DONTFRAG >> 8;
IGMPBUF->ipoffset[1] = UIP_TCPFLAG_DONTFRAG & 0xff;
IGMPBUF->ttl = IGMP_TTL;
IGMPBUF->proto = UIP_PROTO_IGMP;
uiphdr_ipaddr_copy(IGMPBUF->srcipaddr, &dev->d_ipaddr);
uiphdr_ipaddr_copy(IGMPBUF->destipaddr, destipaddr);
/* Calculate IP checksum. */
IGMPBUF->ipchksum = 0;
IGMPBUF->ipchksum = ~uip_igmpchksum((FAR uint8_t *)IGMPBUF, UIP_IPH_LEN + RASIZE);
/* Set up the IGMP message */
IGMPBUF->type = group->msgid;
IGMPBUF->maxresp = 0;
uiphdr_ipaddr_copy(IGMPBUF->grpaddr, &group->grpaddr);
/* Calculate the IGMP checksum. */
IGMPBUF->chksum = 0;
IGMPBUF->chksum = ~uip_igmpchksum(&IGMPBUF->type, UIP_IPIGMPH_LEN);
IGMP_STATINCR(uip_stat.igmp.poll_send);
IGMP_STATINCR(uip_stat.ip.sent);
nllvdbg("Outgoing IGMP packet length: %d (%d)\n",
dev->d_len, (IGMPBUF->len[0] << 8) | IGMPBUF->len[1]);
igmp_dumppkt(RA, UIP_IPIGMPH_LEN + RASIZE);
}
#endif /* CONFIG_NET_IGMP */
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