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Commit 35e77d21 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

SUNRPC: Add rpc_auth::au_ralign field 



Currently rpc_inline_rcv_pages() uses au_rslack to estimate the
size of the upper layer reply header. This is fine for auth flavors
where au_verfsize == au_rslack.

However, some auth flavors have more going on. krb5i for example has
two more words after the verifier, and another blob following the
RPC message. The calculation involving au_rslack pushes the upper
layer reply header too far into the rcv_buf.

au_rslack is still valuable: it's the amount of buffer space needed
for the reply, and is used when allocating the reply buffer. We'll
keep that.

But, add a new field that can be used to properly estimate the
location of the upper layer header in each RPC reply, based on the
auth flavor in use.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent a00275ba

include/linux/sunrpc/auth.h

+4 −5
Original line number Diff line number Diff line
@@ -74,13 +74,12 @@ struct rpc_cred_cache; 
struct rpc_authops;

struct rpc_auth {

	unsigned int		au_cslack;	/* call cred size estimate */

				/* guess at number of u32's auth adds before

				 * reply data; normally the verifier size: */

	unsigned int		au_rslack;

	unsigned int		au_rslack;	/* reply cred size estimate */

	unsigned int		au_verfsize;	/* size of reply verifier */

	unsigned int		au_ralign;	/* words before UL header */



	unsigned int		au_flags;	/* various flags */

	const struct rpc_authops *au_ops;		/* operations */

	unsigned int		au_flags;

	const struct rpc_authops *au_ops;

	rpc_authflavor_t	au_flavor;	/* pseudoflavor (note may

						 * differ from the flavor in

						 * au_ops->au_flavor in gss

net/sunrpc/auth_gss/auth_gss.c

+13 −5
Original line number Diff line number Diff line
@@ -1017,6 +1017,7 @@ gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 
	auth->au_cslack = GSS_CRED_SLACK >> 2;

	auth->au_rslack = GSS_VERF_SLACK >> 2;

	auth->au_verfsize = GSS_VERF_SLACK >> 2;

	auth->au_ralign = GSS_VERF_SLACK >> 2;

	auth->au_flags = 0;

	auth->au_ops = &authgss_ops;

	auth->au_flavor = flavor;
@@ -1891,7 +1892,10 @@ static int gss_wrap_req(struct rpc_task *task, struct xdr_stream *xdr) 
static int

gss_unwrap_resp_auth(struct rpc_cred *cred)

{

	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize;

	struct rpc_auth *auth = cred->cr_auth;



	auth->au_rslack = auth->au_verfsize;

	auth->au_ralign = auth->au_verfsize;

	return 0;

}
@@ -1902,6 +1906,7 @@ gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred, 
{

	struct xdr_buf integ_buf, *rcv_buf = &rqstp->rq_rcv_buf;

	u32 data_offset, mic_offset, integ_len, maj_stat;

	struct rpc_auth *auth = cred->cr_auth;

	struct xdr_netobj mic;

	__be32 *p;
@@ -1928,8 +1933,8 @@ gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred, 
	if (maj_stat != GSS_S_COMPLETE)

		goto bad_mic;



	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + 2 +

				   1 + XDR_QUADLEN(mic.len);

	auth->au_rslack = auth->au_verfsize + 2 + 1 + XDR_QUADLEN(mic.len);

	auth->au_ralign = auth->au_verfsize + 2;

	return 0;

unwrap_failed:

	trace_rpcgss_unwrap_failed(task);
@@ -1949,6 +1954,7 @@ gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred, 
{

	struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;

	struct kvec *head = rqstp->rq_rcv_buf.head;

	struct rpc_auth *auth = cred->cr_auth;

	unsigned int savedlen = rcv_buf->len;

	u32 offset, opaque_len, maj_stat;

	__be32 *p;
@@ -1976,7 +1982,9 @@ gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred, 
	 */

	xdr_init_decode(xdr, rcv_buf, p, rqstp);



	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + 2 +

	auth->au_rslack = auth->au_verfsize + 2 +

			  XDR_QUADLEN(savedlen - rcv_buf->len);

	auth->au_ralign = auth->au_verfsize + 2 +

			  XDR_QUADLEN(savedlen - rcv_buf->len);

	return 0;

unwrap_failed:

net/sunrpc/auth_null.c

+1 −0
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ struct rpc_auth null_auth = { 
	.au_cslack	= NUL_CALLSLACK,

	.au_rslack	= NUL_REPLYSLACK,

	.au_verfsize	= NUL_REPLYSLACK,

	.au_ralign	= NUL_REPLYSLACK,

	.au_ops		= &authnull_ops,

	.au_flavor	= RPC_AUTH_NULL,

	.au_count	= REFCOUNT_INIT(1),

net/sunrpc/auth_unix.c

+1 −0
Original line number Diff line number Diff line
@@ -187,6 +187,7 @@ unx_validate(struct rpc_task *task, struct xdr_stream *xdr) 


	auth->au_verfsize = XDR_QUADLEN(size) + 2;

	auth->au_rslack = XDR_QUADLEN(size) + 2;

	auth->au_ralign = XDR_QUADLEN(size) + 2;

	return 0;

}

net/sunrpc/clnt.c

+1 −1
Original line number Diff line number Diff line
@@ -1180,7 +1180,7 @@ void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages, 
	/* Subtract one to force an extra word of buffer space for the

	 * payload's XDR pad to fall into the rcv_buf's tail iovec.

	 */

	hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_rslack - 1;

	hdrsize += RPC_REPHDRSIZE + req->rq_cred->cr_auth->au_ralign - 1;



	xdr_inline_pages(&req->rq_rcv_buf, hdrsize << 2, pages, base, len);

	trace_rpc_reply_pages(req);