pimd/pim_msg.h

   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 along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #ifndef PIM_MSG_H
  21 #define PIM_MSG_H
  22
  23 #include <netinet/in.h>
  24
  25 #include "pim_jp_agg.h"
  26 /*
  27   Number       Description
  28   ----------   ------------------
  29   0            Reserved
  30   1            IP (IP version 4)
  31   2            IP6 (IP version 6)
  32
  33   From:
  34   http://www.iana.org/assignments/address-family-numbers
  35 */
  36 enum pim_msg_address_family {
  37         PIM_MSG_ADDRESS_FAMILY_RESERVED,
  38         PIM_MSG_ADDRESS_FAMILY_IPV4,
  39         PIM_MSG_ADDRESS_FAMILY_IPV6,
  40 };
  41
  42 /*
  43  * Network Order pim_msg_hdr
  44  */
  45 struct pim_msg_header {
  46         uint8_t type : 4;
  47         uint8_t ver : 4;
  48         uint8_t reserved;
  49         uint16_t checksum;
  50 } __attribute__((packed));
  51
  52 struct pim_encoded_ipv4_unicast {
  53         uint8_t family;
  54         uint8_t reserved;
  55         struct in_addr addr;
  56 } __attribute__((packed));
  57
  58 struct pim_encoded_group_ipv4 {
  59         uint8_t ne;
  60         uint8_t family;
  61         uint8_t reserved;
  62         uint8_t mask;
  63         struct in_addr addr;
  64 } __attribute__((packed));
  65
  66 struct pim_encoded_source_ipv4 {
  67         uint8_t ne;
  68         uint8_t family;
  69         uint8_t bits;
  70         uint8_t mask;
  71         struct in_addr addr;
  72 } __attribute__((packed));
  73
  74 struct pim_jp_groups {
  75         struct pim_encoded_group_ipv4 g;
  76         uint16_t joins;
  77         uint16_t prunes;
  78         struct pim_encoded_source_ipv4 s[1];
  79 } __attribute__((packed));
  80
  81 struct pim_jp {
  82         struct pim_msg_header header;
  83         struct pim_encoded_ipv4_unicast addr;
  84         uint8_t reserved;
  85         uint8_t num_groups;
  86         uint16_t holdtime;
  87         struct pim_jp_groups groups[1];
  88 } __attribute__((packed));
  89
  90 void pim_msg_build_header(uint8_t *pim_msg, size_t pim_msg_size,
  91                           uint8_t pim_msg_type);
  92 uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr);
  93 uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr);
  94
  95 #define PIM_ENCODE_SPARSE_BIT      0x04
  96 #define PIM_ENCODE_WC_BIT          0x02
  97 #define PIM_ENCODE_RPT_BIT         0x01
  98 uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf, struct in_addr addr,
  99                                          uint8_t bits);
 100
 101
 102 size_t pim_msg_get_jp_group_size(struct list *sources);
 103 size_t pim_msg_build_jp_groups(struct pim_jp_groups *grp,
 104                                struct pim_jp_agg_group *sgs, size_t size);
 105 #endif /* PIM_MSG_H */