/*
* linux/include/linux/sunrpc/addr.h
*
* Various routines for copying and comparing sockaddrs and for
* converting them to and from presentation format.
*/
#ifndef _LINUX_SUNRPC_ADDR_H
#define _LINUX_SUNRPC_ADDR_H

#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/ipv6.h>

size_t rpc_ntop(const struct sockaddr *, char *, const size_t);
size_t rpc_pton(struct net *, const char *, const size_t,
struct sockaddr *, const size_t);
char * rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
size_t rpc_uaddr2sockaddr(struct net *, const char *, const size_t,
struct sockaddr *, const size_t);

static inline unsigned short rpc_get_port(const struct sockaddr *sap)
{
switch (sap->sa_family) {
case AF_INET:
return ntohs(((struct sockaddr_in *)sap)->sin_port);
case AF_INET6:
return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
}
return 0;
}

static inline void rpc_set_port(struct sockaddr *sap,
const unsigned short port)
{
switch (sap->sa_family) {
case AF_INET:
((struct sockaddr_in *)sap)->sin_port = htons(port);
break;
case AF_INET6:
((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
break;
}
}

#define IPV6_SCOPE_DELIMITER '%'
#define IPV6_SCOPE_ID_LEN sizeof("%nnnnnnnnnn")

static inline bool __rpc_cmp_addr4(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;

return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
}

static inline bool __rpc_copy_addr4(struct sockaddr *dst,
const struct sockaddr *src)
{
const struct sockaddr_in *ssin = (struct sockaddr_in *) src;
struct sockaddr_in *dsin = (struct sockaddr_in *) dst;

dsin->sin_family = ssin->sin_family;
dsin->sin_addr.s_addr = ssin->sin_addr.s_addr;
return true;
}

#if IS_ENABLED(CONFIG_IPV6)
static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;

if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
return false;
else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
return sin1->sin6_scope_id == sin2->sin6_scope_id;

return true;
}

static inline bool __rpc_copy_addr6(struct sockaddr *dst,
const struct sockaddr *src)
{
const struct sockaddr_in6 *ssin6 = (const struct sockaddr_in6 *) src;
struct sockaddr_in6 *dsin6 = (struct sockaddr_in6 *) dst;

dsin6->sin6_family = ssin6->sin6_family;
dsin6->sin6_addr = ssin6->sin6_addr;
dsin6->sin6_scope_id = ssin6->sin6_scope_id;
return true;
}
#else /* !(IS_ENABLED(CONFIG_IPV6) */
static inline bool __rpc_cmp_addr6(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
return false;
}

static inline bool __rpc_copy_addr6(struct sockaddr *dst,
const struct sockaddr *src)
{
return false;
}
#endif /* !(IS_ENABLED(CONFIG_IPV6) */

/**
* rpc_cmp_addr - compare the address portion of two sockaddrs.
* @sap1: first sockaddr
* @sap2: second sockaddr
*
* Just compares the family and address portion. Ignores port, but
* compares the scope if it's a link-local address.
*
* Returns true if the addrs are equal, false if they aren't.
*/
static inline bool rpc_cmp_addr(const struct sockaddr *sap1,
const struct sockaddr *sap2)
{
if (sap1->sa_family == sap2->sa_family) {
switch (sap1->sa_family) {
case AF_INET:
return __rpc_cmp_addr4(sap1, sap2);
case AF_INET6:
return __rpc_cmp_addr6(sap1, sap2);
}
}
return false;
}

/**
* rpc_copy_addr - copy the address portion of one sockaddr to another
* @dst: destination sockaddr
* @src: source sockaddr
*
* Just copies the address portion and family. Ignores port, scope, etc.
* Caller is responsible for making certain that dst is large enough to hold
* the address in src. Returns true if address family is supported. Returns
* false otherwise.
*/
static inline bool rpc_copy_addr(struct sockaddr *dst,
const struct sockaddr *src)
{
switch (src->sa_family) {
case AF_INET:
return __rpc_copy_addr4(dst, src);
case AF_INET6:
return __rpc_copy_addr6(dst, src);
}
return false;
}

/**
* rpc_get_scope_id - return scopeid for a given sockaddr
* @sa: sockaddr to get scopeid from
*
* Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
* not an AF_INET6 address.
*/
static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
{
if (sa->sa_family != AF_INET6)
return 0;

return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
}

#endif /* _LINUX_SUNRPC_ADDR_H */