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 along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _ZEBRA_SOCKOPT_H
  22 #define _ZEBRA_SOCKOPT_H
  23
  24 #include "sockunion.h"
  25
  26 #ifdef __cplusplus
  27 extern "C" {
  28 #endif
  29
  30 extern void setsockopt_so_recvbuf(int sock, int size);
  31 extern void setsockopt_so_sendbuf(const int sock, int size);
  32 extern int getsockopt_so_sendbuf(const int sock);
  33 extern int getsockopt_so_recvbuf(const int sock);
  34
  35 extern int setsockopt_ipv6_pktinfo(int, int);
  36 extern int setsockopt_ipv6_checksum(int, int);
  37 extern int setsockopt_ipv6_multicast_hops(int, int);
  38 extern int setsockopt_ipv6_unicast_hops(int, int);
  39 extern int setsockopt_ipv6_hoplimit(int, int);
  40 extern int setsockopt_ipv6_multicast_loop(int, int);
  41 extern int setsockopt_ipv6_tclass(int, int);
  42
  43 #define SOPT_SIZE_CMSG_PKTINFO_IPV6() (sizeof (struct in6_pktinfo));
  44
  45 /*
  46  * Size defines for control messages used to get ifindex.  We define
  47  * values for each method, and define a macro that can be used by code
  48  * that is unaware of which method is in use.
  49  * These values are without any alignment needed (see CMSG_SPACE in RFC3542).
  50  */
  51 #if defined(IP_PKTINFO)
  52 /* Linux in_pktinfo. */
  53 #define SOPT_SIZE_CMSG_PKTINFO_IPV4()  (CMSG_SPACE(sizeof (struct in_pktinfo)))
  54 /* XXX This should perhaps be defined even if IP_PKTINFO is not. */
  55 #define SOPT_SIZE_CMSG_PKTINFO(af)                                             \
  56   ((af == AF_INET) ? SOPT_SIZE_CMSG_PKTINFO_IPV4() \
  57                    : SOPT_SIZE_CMSG_PKTINFO_IPV6()
  58 #endif /* IP_PKTINFO */
  59
  60 #if defined(IP_RECVIF)
  61 /* BSD/Solaris */
  62
  63 #if defined(SUNOS_5)
  64 #define SOPT_SIZE_CMSG_RECVIF_IPV4()  (sizeof (uint_t))
  65 #else
  66 #define SOPT_SIZE_CMSG_RECVIF_IPV4()    (sizeof (struct sockaddr_dl))
  67 #endif /* SUNOS_5 */
  68 #endif /* IP_RECVIF */
  69
  70 /* SOPT_SIZE_CMSG_IFINDEX_IPV4 - portable type */
  71 #if defined(SOPT_SIZE_CMSG_PKTINFO)
  72 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_PKTINFO_IPV4()
  73 #elif defined(SOPT_SIZE_CMSG_RECVIF_IPV4)
  74 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_RECVIF_IPV4()
  75 #else  /* Nothing available */
  76 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() (sizeof (char *))
  77 #endif /* SOPT_SIZE_CMSG_IFINDEX_IPV4 */
  78
  79 #define SOPT_SIZE_CMSG_IFINDEX(af)                                             \
  80   (((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
  81                     ? SOPT_SIZE_CMSG_PKTINFO_IPV6())
  82
  83 extern int setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
  84                                         ifindex_t ifindex);
  85 extern int setsockopt_ipv4_multicast(int sock, int optname,
  86                                      struct in_addr if_addr,
  87                                      unsigned int mcast_addr,
  88                                      ifindex_t ifindex);
  89 extern int setsockopt_ipv4_multicast_loop(int sock, uint8_t val);
  90
  91 extern int setsockopt_ipv4_tos(int sock, int tos);
  92
  93 /* Ask for, and get, ifindex, by whatever method is supported. */
  94 extern int setsockopt_ifindex(int, int, ifindex_t);
  95 extern ifindex_t getsockopt_ifindex(int, struct msghdr *);
  96
  97 /* swab the fields in iph between the host order and system order expected
  98  * for IP_HDRINCL.
  99  */
 100 extern void sockopt_iphdrincl_swab_htosys(struct ip *iph);
 101 extern void sockopt_iphdrincl_swab_systoh(struct ip *iph);
 102
 103 extern int sockopt_tcp_rtt(int);
 104
 105 /*
 106  * TCP MD5 signature option. This option allows TCP MD5 to be enabled on
 107  * addresses.
 108  *
 109  * sock
 110  *    Socket to enable option on.
 111  *
 112  * su
 113  *    Sockunion specifying address to enable option on.
 114  *
 115  * password
 116  *    MD5 auth password
 117  */
 118 extern int sockopt_tcp_signature(int sock, union sockunion *su,
 119                                  const char *password);
 120
 121 /*
 122  * Extended TCP MD5 signature option. This option allows TCP MD5 to be enabled
 123  * on prefixes.
 124  *
 125  * sock
 126  *    Socket to enable option on.
 127  *
 128  * su
 129  *    Sockunion specifying address (or prefix) to enable option on.
 130  *
 131  * prefixlen
 132  *    0    - su is an address; fall back to non-extended mode
 133  *    Else - su is a prefix; prefixlen is the mask length
 134  *
 135  * password
 136  *    MD5 auth password
 137  */
 138 extern int sockopt_tcp_signature_ext(int sock, union sockunion *su,
 139                                      uint16_t prefixlen, const char *password);
 140
 141 #ifdef __cplusplus
 142 }
 143 #endif
 144
 145 #endif /*_ZEBRA_SOCKOPT_H */