lib/sockopt.h

   1 /* Router advertisement
   2  * Copyright (C) 1999 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #ifndef _ZEBRA_SOCKOPT_H
  23 #define _ZEBRA_SOCKOPT_H
  24
  25 extern int setsockopt_so_recvbuf (int sock, int size);
  26
  27 #ifdef HAVE_IPV6
  28 extern int setsockopt_ipv6_pktinfo (int, int);
  29 extern int setsockopt_ipv6_checksum (int, int);
  30 extern int setsockopt_ipv6_multicast_hops (int, int);
  31 extern int setsockopt_ipv6_unicast_hops (int, int);
  32 extern int setsockopt_ipv6_hoplimit (int, int);
  33 extern int setsockopt_ipv6_multicast_loop (int, int);
  34 #endif /* HAVE_IPV6 */
  35
  36 /*
  37  * It is OK to reference in6_pktinfo here without a protecting #if
  38  * because this macro will only be used #if HAVE_IPV6, and in6_pktinfo
  39  * is not optional for HAVE_IPV6.
  40  */
  41 #define SOPT_SIZE_CMSG_PKTINFO_IPV6() (sizeof (struct in6_pktinfo));
  42
  43 /*
  44  * Size defines for control messages used to get ifindex.  We define
  45  * values for each method, and define a macro that can be used by code
  46  * that is unaware of which method is in use.
  47  * These values are without any alignment needed (see CMSG_SPACE in RFC3542).
  48  */
  49 #if defined (IP_PKTINFO)
  50 /* Linux in_pktinfo. */
  51 #define SOPT_SIZE_CMSG_PKTINFO_IPV4()  (CMSG_SPACE(sizeof (struct in_pktinfo)))
  52 /* XXX This should perhaps be defined even if IP_PKTINFO is not. */
  53 #define SOPT_SIZE_CMSG_PKTINFO(af) \
  54   ((af == AF_INET) ? SOPT_SIZE_CMSG_PKTINFO_IPV4() \
  55                    : SOPT_SIZE_CMSG_PKTINFO_IPV6()
  56 #endif /* IP_PKTINFO */
  57
  58 #if defined (IP_RECVIF)
  59 /* BSD/Solaris */
  60
  61 #if defined (SUNOS_5)
  62 #define SOPT_SIZE_CMSG_RECVIF_IPV4()  (sizeof (uint_t))
  63 #else
  64 #define SOPT_SIZE_CMSG_RECVIF_IPV4()    (sizeof (struct sockaddr_dl))
  65 #endif /* SUNOS_5 */
  66 #endif /* IP_RECVIF */
  67
  68 /* SOPT_SIZE_CMSG_IFINDEX_IPV4 - portable type */
  69 #if defined (SOPT_SIZE_CMSG_PKTINFO)
  70 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_PKTINFO_IPV4()
  71 #elif defined (SOPT_SIZE_CMSG_RECVIF_IPV4)
  72 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_RECVIF_IPV4()
  73 #else /* Nothing available */
  74 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() (sizeof (char *))
  75 #endif /* SOPT_SIZE_CMSG_IFINDEX_IPV4 */
  76
  77 #define SOPT_SIZE_CMSG_IFINDEX(af) \
  78   (((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
  79                     ? SOPT_SIZE_CMSG_PKTINFO_IPV6())
  80
  81 extern int setsockopt_multicast_ipv4(int sock, int optname,
  82                                      struct in_addr if_addr
  83                                          /* required: interface to join on */,
  84                                      unsigned int mcast_addr,
  85                                      unsigned int ifindex
  86                                          /* optional: if non-zero, may be used
  87                                                 instead of if_addr */);
  88
  89 /* Ask for, and get, ifindex, by whatever method is supported. */
  90 extern int setsockopt_ifindex (int, int, int);
  91 extern int getsockopt_ifindex (int, struct msghdr *);
  92
  93 /* swab the fields in iph between the host order and system order expected
  94  * for IP_HDRINCL.
  95  */
  96 extern void sockopt_iphdrincl_swab_htosys (struct ip *iph);
  97 extern void sockopt_iphdrincl_swab_systoh (struct ip *iph);
  98
  99 #endif /*_ZEBRA_SOCKOPT_H */