pimd/pim_igmp_join.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_IGMP_JOIN_H
  21 #define PIM_IGMP_JOIN_H
  22
  23 /* required headers #include'd by caller */
  24
  25 #ifndef SOL_IP
  26 #define SOL_IP IPPROTO_IP
  27 #endif
  28
  29 #ifndef MCAST_JOIN_GROUP
  30 #define MCAST_JOIN_GROUP 42
  31 #endif
  32
  33 #ifndef MCAST_JOIN_SOURCE_GROUP
  34 #define MCAST_JOIN_SOURCE_GROUP 46
  35 struct group_source_req {
  36         uint32_t gsr_interface;
  37         struct sockaddr_storage gsr_group;
  38         struct sockaddr_storage gsr_source;
  39 };
  40 #endif
  41
  42 static int pim_igmp_join_source(int fd, ifindex_t ifindex,
  43                                 struct in_addr group_addr,
  44                                 struct in_addr source_addr)
  45 {
  46         struct group_source_req req;
  47         struct sockaddr_in group;
  48         struct sockaddr_in source;
  49
  50         memset(&req, 0, sizeof(req));
  51         memset(&group, 0, sizeof(group));
  52         group.sin_family = AF_INET;
  53         group.sin_addr = group_addr;
  54         group.sin_port = htons(0);
  55         memcpy(&req.gsr_group, &group, sizeof(struct sockaddr_in));
  56
  57         memset(&source, 0, sizeof(source));
  58         source.sin_family = AF_INET;
  59         source.sin_addr = source_addr;
  60         source.sin_port = htons(0);
  61         memcpy(&req.gsr_source, &source, sizeof(struct sockaddr_in));
  62
  63         req.gsr_interface = ifindex;
  64
  65         if (source_addr.s_addr == INADDR_ANY)
  66                 return setsockopt(fd, SOL_IP, MCAST_JOIN_GROUP, &req,
  67                                   sizeof(req));
  68         else
  69                 return setsockopt(fd, SOL_IP, MCAST_JOIN_SOURCE_GROUP, &req,
  70                                   sizeof(req));
  71 }
  72
  73 #endif /* PIM_IGMP_JOIN_H */