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 #include "sockunion.h"
  26
  27 extern int setsockopt_so_recvbuf (int sock, int size);
  28 extern int setsockopt_so_sendbuf (const int sock, int size);
  29 extern int getsockopt_so_sendbuf (const int sock);
  30
  31 #ifdef HAVE_IPV6
  32 extern int setsockopt_ipv6_pktinfo (int, int);
  33 extern int setsockopt_ipv6_checksum (int, int);
  34 extern int setsockopt_ipv6_multicast_hops (int, int);
  35 extern int setsockopt_ipv6_unicast_hops (int, int);
  36 extern int setsockopt_ipv6_hoplimit (int, int);
  37 extern int setsockopt_ipv6_multicast_loop (int, int);
  38 extern int setsockopt_ipv6_tclass (int, int);
  39 #endif /* HAVE_IPV6 */
  40
  41 /*
  42  * It is OK to reference in6_pktinfo here without a protecting #if
  43  * because this macro will only be used #if HAVE_IPV6, and in6_pktinfo
  44  * is not optional for HAVE_IPV6.
  45  */
  46 #define SOPT_SIZE_CMSG_PKTINFO_IPV6() (sizeof (struct in6_pktinfo));
  47
  48 /*
  49  * Size defines for control messages used to get ifindex.  We define
  50  * values for each method, and define a macro that can be used by code
  51  * that is unaware of which method is in use.
  52  * These values are without any alignment needed (see CMSG_SPACE in RFC3542).
  53  */
  54 #if defined (IP_PKTINFO)
  55 /* Linux in_pktinfo. */
  56 #define SOPT_SIZE_CMSG_PKTINFO_IPV4()  (CMSG_SPACE(sizeof (struct in_pktinfo)))
  57 /* XXX This should perhaps be defined even if IP_PKTINFO is not. */
  58 #define SOPT_SIZE_CMSG_PKTINFO(af) \
  59   ((af == AF_INET) ? SOPT_SIZE_CMSG_PKTINFO_IPV4() \
  60                    : SOPT_SIZE_CMSG_PKTINFO_IPV6()
  61 #endif /* IP_PKTINFO */
  62
  63 #if defined (IP_RECVIF)
  64 /* BSD/Solaris */
  65
  66 #if defined (SUNOS_5)
  67 #define SOPT_SIZE_CMSG_RECVIF_IPV4()  (sizeof (uint_t))
  68 #else
  69 #define SOPT_SIZE_CMSG_RECVIF_IPV4()    (sizeof (struct sockaddr_dl))
  70 #endif /* SUNOS_5 */
  71 #endif /* IP_RECVIF */
  72
  73 /* SOPT_SIZE_CMSG_IFINDEX_IPV4 - portable type */
  74 #if defined (SOPT_SIZE_CMSG_PKTINFO)
  75 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_PKTINFO_IPV4()
  76 #elif defined (SOPT_SIZE_CMSG_RECVIF_IPV4)
  77 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_RECVIF_IPV4()
  78 #else /* Nothing available */
  79 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() (sizeof (char *))
  80 #endif /* SOPT_SIZE_CMSG_IFINDEX_IPV4 */
  81
  82 #define SOPT_SIZE_CMSG_IFINDEX(af) \
  83   (((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
  84                     ? SOPT_SIZE_CMSG_PKTINFO_IPV6())
  85
  86 extern int setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
  87                                         ifindex_t ifindex);
  88 extern int setsockopt_ipv4_multicast(int sock, int optname,
  89                                      struct in_addr if_addr,
  90                                      unsigned int mcast_addr,
  91                                      ifindex_t ifindex);
  92 extern int setsockopt_ipv4_multicast_loop (int sock, u_char val);
  93
  94 extern int setsockopt_ipv4_tos(int sock, int tos);
  95
  96 /* Ask for, and get, ifindex, by whatever method is supported. */
  97 extern int setsockopt_ifindex (int, int, ifindex_t);
  98 extern ifindex_t getsockopt_ifindex (int, struct msghdr *);
  99
 100 /* swab the fields in iph between the host order and system order expected
 101  * for IP_HDRINCL.
 102  */
 103 extern void sockopt_iphdrincl_swab_htosys (struct ip *iph);
 104 extern void sockopt_iphdrincl_swab_systoh (struct ip *iph);
 105
 106 extern int sockopt_tcp_rtt (int);
 107 extern int sockopt_tcp_signature(int sock, union sockunion *su,
 108                                  const char *password);
 109 #endif /*_ZEBRA_SOCKOPT_H */