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/*
* Copyright 2009 Oracle. All rights reserved.
*
* This file is part of nfs-utils.
*
* nfs-utils is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* nfs-utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with nfs-utils. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef NFS_UTILS_SOCKADDR_H
#define NFS_UTILS_SOCKADDR_H
#include <libio.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <netinet/in.h>
/*
* This type is for defining buffers that contain network socket
* addresses.
*
* Casting a "struct sockaddr *" to the address of a "struct
* sockaddr_storage" breaks C aliasing rules. The "union
* nfs_sockaddr" type follows C aliasing rules yet specifically
* allows converting pointers to it between "struct sockaddr *"
* and a few other network sockaddr-related pointer types.
*
* Note that this union is much smaller than a sockaddr_storage.
* It should be used only for AF_INET or AF_INET6 socket addresses.
* An AF_LOCAL sockaddr_un, for example, will clearly not fit into
* a buffer of this type.
*/
union nfs_sockaddr {
struct sockaddr sa;
struct sockaddr_in s4;
struct sockaddr_in6 s6;
};
#if SIZEOF_SOCKLEN_T - 0 == 0
#define socklen_t unsigned int
#endif
#define SIZEOF_SOCKADDR_UNKNOWN (socklen_t)0
#define SIZEOF_SOCKADDR_IN (socklen_t)sizeof(struct sockaddr_in)
#ifdef IPV6_SUPPORTED
#define SIZEOF_SOCKADDR_IN6 (socklen_t)sizeof(struct sockaddr_in6)
#else /* !IPV6_SUPPORTED */
#define SIZEOF_SOCKADDR_IN6 SIZEOF_SOCKADDR_UNKNOWN
#endif /* !IPV6_SUPPORTED */
/**
* nfs_sockaddr_length - return the size in bytes of a socket address
* @sap: pointer to socket address
*
* Returns the size in bytes of @sap, or zero if the family is
* not recognized.
*/
static inline socklen_t
nfs_sockaddr_length(const struct sockaddr *sap)
{
switch (sap->sa_family) {
case AF_INET:
return SIZEOF_SOCKADDR_IN;
case AF_INET6:
return SIZEOF_SOCKADDR_IN6;
}
return SIZEOF_SOCKADDR_UNKNOWN;
}
static inline uint16_t
get_port4(const struct sockaddr *sap)
{
const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
return ntohs(sin->sin_port);
}
#ifdef IPV6_SUPPORTED
static inline uint16_t
get_port6(const struct sockaddr *sap)
{
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
return ntohs(sin6->sin6_port);
}
#else /* !IPV6_SUPPORTED */
static inline uint16_t
get_port6(__attribute__ ((unused)) const struct sockaddr *sap)
{
return 0;
}
#endif /* !IPV6_SUPPORTED */
/**
* nfs_get_port - extract port value from a socket address
* @sap: pointer to socket address
*
* Returns port value in host byte order, or zero if the
* socket address contains an unrecognized family.
*/
static inline uint16_t
nfs_get_port(const struct sockaddr *sap)
{
switch (sap->sa_family) {
case AF_INET:
return get_port4(sap);
case AF_INET6:
return get_port6(sap);
}
return 0;
}
static inline void
set_port4(struct sockaddr *sap, const uint16_t port)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sap;
sin->sin_port = htons(port);
}
#ifdef IPV6_SUPPORTED
static inline void
set_port6(struct sockaddr *sap, const uint16_t port)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
sin6->sin6_port = htons(port);
}
#else /* !IPV6_SUPPORTED */
static inline void
set_port6(__attribute__ ((unused)) struct sockaddr *sap,
__attribute__ ((unused)) const uint16_t port)
{
}
#endif /* !IPV6_SUPPORTED */
/**
* nfs_set_port - set port value in a socket address
* @sap: pointer to socket address
* @port: port value to set
*
*/
static inline void
nfs_set_port(struct sockaddr *sap, const uint16_t port)
{
switch (sap->sa_family) {
case AF_INET:
set_port4(sap, port);
break;
case AF_INET6:
set_port6(sap, port);
break;
}
}
/**
* nfs_is_v4_loopback - test to see if socket address is AF_INET loopback
* @sap: pointer to socket address
*
* Returns true if the socket address is the standard IPv4 loopback
* address; otherwise false is returned.
*/
static inline _Bool
nfs_is_v4_loopback(const struct sockaddr *sap)
{
const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
if (sin->sin_family != AF_INET)
return false;
if (sin->sin_addr.s_addr != htonl(INADDR_LOOPBACK))
return false;
return true;
}
static inline _Bool
compare_sockaddr4(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2;
return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}
#ifdef IPV6_SUPPORTED
static inline _Bool
compare_sockaddr6(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2;
const struct in6_addr *saddr1 = &sin1->sin6_addr;
const struct in6_addr *saddr2 = &sin2->sin6_addr;
if (IN6_IS_ADDR_LINKLOCAL(saddr1) && IN6_IS_ADDR_LINKLOCAL(saddr2))
if (sin1->sin6_scope_id != sin2->sin6_scope_id)
return false;
return IN6_ARE_ADDR_EQUAL(saddr1, saddr2);
}
#else /* !IPV6_SUPPORTED */
static inline _Bool
compare_sockaddr6(__attribute__ ((unused)) const struct sockaddr *sa1,
__attribute__ ((unused)) const struct sockaddr *sa2)
{
return false;
}
#endif /* !IPV6_SUPPORTED */
/**
* nfs_compare_sockaddr - compare two socket addresses for equality
* @sa1: pointer to a socket address
* @sa2: pointer to a socket address
*
* Returns true if the two socket addresses contain equivalent
* network addresses; otherwise false is returned.
*/
static inline _Bool
nfs_compare_sockaddr(const struct sockaddr *sa1, const struct sockaddr *sa2)
{
if (sa1 == NULL || sa2 == NULL)
return false;
if (sa1->sa_family == sa2->sa_family)
switch (sa1->sa_family) {
case AF_INET:
return compare_sockaddr4(sa1, sa2);
case AF_INET6:
return compare_sockaddr6(sa1, sa2);
}
return false;
}
#endif /* !NFS_UTILS_SOCKADDR_H */
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