Return to pim_msg.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / quagga / pimd

quagga 1.0.20160315

    1: /*
    2:   PIM for Quagga
    3:   Copyright (C) 2008  Everton da Silva Marques
    4: 
    5:   This program is free software; you can redistribute it and/or modify
    6:   it under the terms of the GNU General Public License as published by
    7:   the Free Software Foundation; either version 2 of the License, or
    8:   (at your option) any later version.
    9: 
   10:   This program is distributed in the hope that it will be useful, but
   11:   WITHOUT ANY WARRANTY; without even the implied warranty of
   12:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:   General Public License for more details.
   14:   
   15:   You should have received a copy of the GNU General Public License
   16:   along with this program; see the file COPYING; if not, write to the
   17:   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   18:   MA 02110-1301 USA
   19:   
   20:   $QuaggaId: $Format:%an, %ai, %h$ $
   21: */
   22: 
   23: #include <zebra.h>
   24: 
   25: #include "pimd.h"
   26: #include "pim_pim.h"
   27: #include "pim_msg.h"
   28: #include "pim_util.h"
   29: 
   30: void pim_msg_build_header(uint8_t *pim_msg, int pim_msg_size,
   31: 			  uint8_t pim_msg_type)
   32: {
   33:   uint16_t checksum;
   34: 
   35:   zassert(pim_msg_size >= PIM_PIM_MIN_LEN);
   36: 
   37:   /*
   38:    * Write header
   39:    */
   40: 
   41:   *(uint8_t *) PIM_MSG_HDR_OFFSET_VERSION(pim_msg) = (PIM_PROTO_VERSION << 4) | pim_msg_type;
   42:   *(uint8_t *) PIM_MSG_HDR_OFFSET_RESERVED(pim_msg) = 0;
   43: 
   44:   /*
   45:    * Compute checksum
   46:    */
   47: 
   48:   *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = 0;
   49:   checksum = in_cksum(pim_msg, pim_msg_size);
   50:   *(uint16_t *) PIM_MSG_HDR_OFFSET_CHECKSUM(pim_msg) = checksum;
   51: }
   52: 
   53: uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf,
   54: 					int buf_size,
   55: 					struct in_addr addr)
   56: {
   57:   const int ENCODED_IPV4_UCAST_SIZE = 6;
   58: 
   59:   if (buf_size < ENCODED_IPV4_UCAST_SIZE) {
   60:     return 0;
   61:   }
   62: 
   63:   buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
   64:   buf[1] = '\0';    /* native encoding */
   65:   memcpy(buf+2, &addr, sizeof(struct in_addr));
   66: 
   67:   return buf + ENCODED_IPV4_UCAST_SIZE;
   68: }
   69: 
   70: uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf,
   71: 					int buf_size,
   72: 					struct in_addr addr)
   73: {
   74:   const int ENCODED_IPV4_GROUP_SIZE = 8;
   75: 
   76:   if (buf_size < ENCODED_IPV4_GROUP_SIZE) {
   77:     return 0;
   78:   }
   79: 
   80:   buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
   81:   buf[1] = '\0';    /* native encoding */
   82:   buf[2] = '\0';    /* reserved */
   83:   buf[3] = 32;      /* mask len */
   84:   memcpy(buf+4, &addr, sizeof(struct in_addr));
   85: 
   86:   return buf + ENCODED_IPV4_GROUP_SIZE;
   87: }
   88: 
   89: uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf,
   90: 					 int buf_size,
   91: 					 struct in_addr addr)
   92: {
   93:   const int ENCODED_IPV4_SOURCE_SIZE = 8;
   94: 
   95:   if (buf_size < ENCODED_IPV4_SOURCE_SIZE) {
   96:     return 0;
   97:   }
   98: 
   99:   buf[0] = PIM_MSG_ADDRESS_FAMILY_IPV4; /* addr family */
  100:   buf[1] = '\0';    /* native encoding */
  101:   buf[2] = 4;       /* reserved = 0 | S bit = 1 | W bit = 0 | R bit = 0 */
  102:   buf[3] = 32;      /* mask len */
  103:   memcpy(buf+4, &addr, sizeof(struct in_addr));
  104: 
  105:   return buf + ENCODED_IPV4_SOURCE_SIZE;
  106: }