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