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SUNRPC: Provide functions for managing universal addresses

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Introduce a set of functions in the kernel's RPC implementation for
converting between a socket address and either a standard
presentation address string or an RPC universal address.

The universal address functions will be used to encode and decode
RPCB_FOO and NFSv4 SETCLIENTID arguments.  The other functions are
part of a previous promise to deliver shared functions that can be
used by upper-layer protocols to display and manipulate IP
addresses.

The kernel's current address printf formatters were designed
specifically for kernel to user-space APIs that require a particular
string format for socket addresses, thus are somewhat limited for the
purposes of sunrpc.ko.  The formatter for IPv6 addresses, %pI6, does
not support short-handing or scope IDs.  Also, these printf formatters
are unique per address family, so a separate formatter string is
required for printing AF_INET and AF_INET6 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2009-08-09 15:09:34 -04:00
committed by Trond Myklebust
parent 0b10bf5e14
commit a02d692611
4 changed files with 403 additions and 3 deletions
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38
include/linux/sunrpc/clnt.h
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@@ -9,6 +9,10 @@
#ifndef _LINUX_SUNRPC_CLNT_H
#define _LINUX_SUNRPC_CLNT_H
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/xprt.h>
@@ -151,5 +155,39 @@ void rpc_force_rebind(struct rpc_clnt *);
size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
const char *rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
size_t rpc_ntop(const struct sockaddr *, char *, const size_t);
size_t rpc_pton(const char *, const size_t,
struct sockaddr *, const size_t);
char * rpc_sockaddr2uaddr(const struct sockaddr *);
size_t rpc_uaddr2sockaddr(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")
#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_CLNT_H */