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RPCSEC_GSS: cleanup au_rslack calculation 

Various xdr encode routines use au_rslack to guess where the reply argument
 will end up, so we can set up the xdr_buf to recieve data into the right place
 for zero copy.

 Currently we calculate the au_rslack estimate when we check the verifier.
 Normally this only depends on the verifier size.  In the integrity case we add
 a few bytes to allow for a length and sequence number.

 It's a bit simpler to calculate only the verifier size when we check the
 verifier, and delay the full calculation till we unwrap.

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2005-10-13 16:54:53 -04:00 committed by Trond Myklebust
parent f3680312a7
commit 24b2605bec
2 changed files with 12 additions and 15 deletions
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7
include/linux/sunrpc/auth.h
View File

@ -66,7 +66,12 @@ struct rpc_cred_cache {
struct rpc_auth {
unsigned int au_cslack; /* call cred size estimate */
unsigned int au_rslack; /* reply verf size guess */
/* guess at number of u32's auth adds before
* reply data; normally the verifier size: */
unsigned int au_rslack;
/* for gss, used to calculate au_rslack: */
unsigned int au_verfsize;
unsigned int au_flags; /* various flags */
struct rpc_authops * au_ops; /* operations */
rpc_authflavor_t au_flavor; /* pseudoflavor (note may

20
net/sunrpc/auth_gss/auth_gss.c
View File

@ -886,8 +886,6 @@ static u32 *
gss_validate(struct rpc_task *task, u32 *p)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
u32 seq, qop_state;
struct kvec iov;
@ -915,18 +913,9 @@ gss_validate(struct rpc_task *task, u32 *p)
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
if (maj_stat)
goto out_bad;
switch (gss_cred->gc_service) {
case RPC_GSS_SVC_NONE:
/* verifier data, flavor, length: */
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 2;
break;
case RPC_GSS_SVC_INTEGRITY:
/* verifier data, flavor, length, length, sequence number: */
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 4;
break;
case RPC_GSS_SVC_PRIVACY:
goto out_bad;
}
/* We leave it to unwrap to calculate au_rslack. For now we just
* calculate the length of the verifier: */
task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2;
gss_put_ctx(ctx);
dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
task->tk_pid);
@ -1067,6 +1056,7 @@ gss_unwrap_resp(struct rpc_task *task,
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
u32 *savedp = p;
int status = -EIO;
if (ctx->gc_proc != RPC_GSS_PROC_DATA)
@ -1082,6 +1072,8 @@ gss_unwrap_resp(struct rpc_task *task,
case RPC_GSS_SVC_PRIVACY:
break;
}
/* take into account extra slack for integrity and privacy cases: */
task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp);
out_decode:
status = decode(rqstp, p, obj);
out: