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 #define SOPT_SIZE_CMSG_RECVIF_IPV4()    (sizeof(struct sockaddr_dl))
  63 #endif /* IP_RECVIF */
  64
  65 /* SOPT_SIZE_CMSG_IFINDEX_IPV4 - portable type */
  66 #if defined(SOPT_SIZE_CMSG_PKTINFO)
  67 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_PKTINFO_IPV4()
  68 #elif defined(SOPT_SIZE_CMSG_RECVIF_IPV4)
  69 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_RECVIF_IPV4()
  70 #else  /* Nothing available */
  71 #define SOPT_SIZE_CMSG_IFINDEX_IPV4() (sizeof(char *))
  72 #endif /* SOPT_SIZE_CMSG_IFINDEX_IPV4 */
  73
  74 #define SOPT_SIZE_CMSG_IFINDEX(af)                                             \
  75   (((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
  76                     ? SOPT_SIZE_CMSG_PKTINFO_IPV6())
  77
  78 extern int setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
  79                                         ifindex_t ifindex);
  80 extern int setsockopt_ipv4_multicast(int sock, int optname,
  81                                      struct in_addr if_addr,
  82                                      unsigned int mcast_addr,
  83                                      ifindex_t ifindex);
  84 extern int setsockopt_ipv4_multicast_loop(int sock, uint8_t val);
  85
  86 extern int setsockopt_ipv4_tos(int sock, int tos);
  87
  88 /* Ask for, and get, ifindex, by whatever method is supported. */
  89 extern int setsockopt_ifindex(int, int, ifindex_t);
  90 extern ifindex_t getsockopt_ifindex(int, struct msghdr *);
  91
  92 /* swab the fields in iph between the host order and system order expected
  93  * for IP_HDRINCL.
  94  */
  95 extern void sockopt_iphdrincl_swab_htosys(struct ip *iph);
  96 extern void sockopt_iphdrincl_swab_systoh(struct ip *iph);
  97
  98 extern int sockopt_tcp_rtt(int);
  99
 100 /*
 101  * TCP MD5 signature option. This option allows TCP MD5 to be enabled on
 102  * addresses.
 103  *
 104  * sock
 105  *    Socket to enable option on.
 106  *
 107  * su
 108  *    Sockunion specifying address to enable option on.
 109  *
 110  * password
 111  *    MD5 auth password
 112  */
 113 extern int sockopt_tcp_signature(int sock, union sockunion *su,
 114                                  const char *password);
 115
 116 /*
 117  * Extended TCP MD5 signature option. This option allows TCP MD5 to be enabled
 118  * on prefixes.
 119  *
 120  * sock
 121  *    Socket to enable option on.
 122  *
 123  * su
 124  *    Sockunion specifying address (or prefix) to enable option on.
 125  *
 126  * prefixlen
 127  *    0    - su is an address; fall back to non-extended mode
 128  *    Else - su is a prefix; prefixlen is the mask length
 129  *
 130  * password
 131  *    MD5 auth password
 132  */
 133 extern int sockopt_tcp_signature_ext(int sock, union sockunion *su,
 134                                      uint16_t prefixlen, const char *password);
 135
 136 /*
 137  * set TCP max segment size. This option allows user to configure
 138  * max segment size for TCP session
 139  *
 140  * sock
 141  *    Socket to enable option on.
 142  *
 143  * tcp_maxseg
 144  *    value used for TCP segment size negotiation during SYN
 145  */
 146 extern int sockopt_tcp_mss_set(int sock, int tcp_maxseg);
 147
 148 /*
 149  * get TCP max segment size. This option allows user to get
 150  * the segment size for TCP session
 151  *
 152  * sock
 153  *    Socket to get max segement size.
 154  */
 155 extern int sockopt_tcp_mss_get(int sock);
 156 #ifdef __cplusplus
 157 }
 158 #endif
 159
 160 #endif /*_ZEBRA_SOCKOPT_H */