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nfs: shorten and simplify rpc_add_credentials a bit 

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Uwe Kleine-König 2014-02-07 22:28:06 +01:00 committed by Sascha Hauer
parent f91c16b8e2
commit 2897531de6
1 changed files with 5 additions and 21 deletions
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26
fs/nfs.c
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@ -224,34 +224,18 @@ out_overflow:
*/
static uint32_t *rpc_add_credentials(uint32_t *p)
{
int hl;
int hostnamelen = 0;
/*
* Here's the executive summary on authentication requirements of the
* various NFS server implementations: Linux accepts both AUTH_NONE
* and AUTH_UNIX authentication (also accepts an empty hostname field
* in the AUTH_UNIX scheme). *BSD refuses AUTH_NONE, but accepts
* AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
* scheme). To be safe, use AUTH_UNIX and pass the hostname if we have
* it (if the BOOTP/DHCP reply didn't give one, just use an empty
* hostname).
* *BSD refuses AUTH_NONE, so use AUTH_UNIX. An empty hostname is OK for
* both Linux and *BSD.
*/
hl = (hostnamelen + 3) & ~3;
/* Provide an AUTH_UNIX credential. */
*p++ = htonl(1); /* AUTH_UNIX */
*p++ = htonl(hl + 20); /* auth length */
*p++ = htonl(20); /* auth length: 20 + strlen(hostname) */
*p++ = htonl(0); /* stamp */
*p++ = htonl(hostnamelen); /* hostname string */
*p++ = htonl(0); /* hostname string length */
/* memcpy(p, "", 0); p += 0; <- empty host name */
if (hostnamelen & 3)
*(p + hostnamelen / 4) = 0; /* add zero padding */
/* memcpy(p, hostname, hostnamelen); */ /* empty hostname */
p += hl / 4;
*p++ = 0; /* uid */
*p++ = 0; /* gid */
*p++ = 0; /* auxiliary gid list */