diff options
Diffstat (limited to 'nuttx/net/uip/uip_igmpsend.c')
| -rwxr-xr-x | nuttx/net/uip/uip_igmpsend.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_igmpsend.c b/nuttx/net/uip/uip_igmpsend.c new file mode 100755 index 000000000..21fc2beb0 --- /dev/null +++ b/nuttx/net/uip/uip_igmpsend.c @@ -0,0 +1,182 @@ +/**************************************************************************** + * 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 */ |