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Annotation of embedaddon/quagga/pimd/pim_msg.c, revision 1.1.1.1

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: }