Return to pim_msg.c CVS log

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

Annotation of embedaddon/quagga/pimd/pim_msg.c, revision 1.1

1.1     ! misho       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: }