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
  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
  21 #ifndef PIM_MSG_H
  22 #define PIM_MSG_H
  23
  24 #include <netinet/in.h>
  25
  26 #include "pim_jp_agg.h"
  27 /*
  28   Number       Description
  29   ----------   ------------------
  30   0            Reserved
  31   1            IP (IP version 4)
  32   2            IP6 (IP version 6)
  33
  34   From:
  35   http://www.iana.org/assignments/address-family-numbers
  36 */
  37 enum pim_msg_address_family {
  38   PIM_MSG_ADDRESS_FAMILY_RESERVED,
  39   PIM_MSG_ADDRESS_FAMILY_IPV4,
  40   PIM_MSG_ADDRESS_FAMILY_IPV6,
  41 };
  42
  43 /*
  44  * Network Order pim_msg_hdr
  45  */
  46 struct pim_msg_header {
  47   uint8_t  type:4;
  48   uint8_t  ver:4;
  49   uint8_t  reserved;
  50   uint16_t checksum;
  51 } __attribute__ ((packed));
  52
  53 struct pim_encoded_ipv4_unicast {
  54   uint8_t  family;
  55   uint8_t  reserved;
  56   struct in_addr addr;
  57 } __attribute__ ((packed));
  58
  59 struct pim_encoded_group_ipv4 {
  60   uint8_t        ne;
  61   uint8_t        family;
  62   uint8_t        reserved;
  63   uint8_t        mask;
  64   struct in_addr addr;
  65 } __attribute__ ((packed));
  66
  67 struct pim_encoded_source_ipv4 {
  68   uint8_t        ne;
  69   uint8_t        family;
  70   uint8_t        bits;
  71   uint8_t        mask;
  72   struct in_addr addr;
  73 } __attribute__ ((packed));
  74
  75 struct pim_jp_groups {
  76   struct pim_encoded_group_ipv4  g;
  77   uint16_t                       joins;
  78   uint16_t                       prunes;
  79   struct pim_encoded_source_ipv4 s[1];
  80 } __attribute__ ((packed));
  81
  82 struct pim_jp {
  83   struct pim_msg_header           header;
  84   struct pim_encoded_ipv4_unicast addr;
  85   uint8_t                         reserved;
  86   uint8_t                         num_groups;
  87   uint16_t                        holdtime;
  88   struct pim_jp_groups            groups[1];
  89 } __attribute__ ((packed));
  90
  91 void pim_msg_build_header(uint8_t *pim_msg, size_t pim_msg_size, 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,
  99                                          struct in_addr addr, 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, struct pim_jp_agg_group *sgs, size_t size);
 104 #endif /* PIM_MSG_H */