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 /*
  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 #define PIM_MSG_ADDRESS_FAMILY_IPV4 (1)
  37
  38 /*
  39  * Network Order pim_msg_hdr
  40  */
  41 struct pim_msg_header {
  42   uint8_t  type:4;
  43   uint8_t  ver:4;
  44   uint8_t  reserved;
  45   uint16_t checksum;
  46 } __attribute__ ((packed));
  47
  48 struct pim_encoded_ipv4_unicast {
  49   uint8_t  family;
  50   uint8_t  reserved;
  51   struct in_addr addr;
  52 } __attribute__ ((packed));
  53
  54 struct pim_encoded_group_ipv4 {
  55   uint8_t        ne;
  56   uint8_t        family;
  57   uint8_t        reserved;
  58   uint8_t        mask;
  59   struct in_addr addr;
  60 } __attribute__ ((packed));
  61
  62 struct pim_encoded_source_ipv4 {
  63   uint8_t        ne;
  64   uint8_t        family;
  65   uint8_t        bits;
  66   uint8_t        mask;
  67   struct in_addr addr;
  68 } __attribute__ ((packed));
  69
  70 struct pim_jp_groups {
  71   struct pim_encoded_group_ipv4  g;
  72   uint16_t                       joins;
  73   uint16_t                       prunes;
  74   struct pim_encoded_source_ipv4 s[1];
  75 } __attribute__ ((packed));
  76
  77 struct pim_jp {
  78   struct pim_msg_header           header;
  79   struct pim_encoded_ipv4_unicast addr;
  80   uint8_t                         reserved;
  81   uint8_t                         num_groups;
  82   uint16_t                        holdtime;
  83   struct pim_jp_groups            groups[1];
  84 } __attribute__ ((packed));
  85
  86 void pim_msg_build_header(uint8_t *pim_msg, size_t pim_msg_size, uint8_t pim_msg_type);
  87 uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr);
  88 uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr);
  89
  90 #define PIM_ENCODE_SPARSE_BIT      0x04
  91 #define PIM_ENCODE_WC_BIT          0x02
  92 #define PIM_ENCODE_RPT_BIT         0x01
  93 uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf,
  94                                          struct in_addr addr, uint8_t bits);
  95
  96
  97 int pim_msg_join_prune_encode (uint8_t *buf, size_t buf_size, int is_join,
  98                                struct pim_upstream *up,
  99                                struct in_addr upstream, int holdtime);
 100 #endif /* PIM_MSG_H */