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[PATCH] knfsd: svcrpc: Simplify nfsd rpcsec_gss integrity code 

Pull out some of the integrity code into its own function, otherwise
svcauth_gss_release() is going to become very ungainly after the addition of
privacy code.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
J. Bruce Fields 2006-06-30 01:56:18 -07:00 committed by Linus Torvalds
parent 9ecb6a08d8
commit e142ede8e0
1 changed files with 64 additions and 51 deletions
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115
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -1072,8 +1072,8 @@ out:
return ret;
}
static int
svcauth_gss_release(struct svc_rqst *rqstp)
static inline int
svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc = &gsd->clcred;
@ -1085,6 +1085,67 @@ svcauth_gss_release(struct svc_rqst *rqstp)
int integ_offset, integ_len;
int stat = -EINVAL;
p = gsd->body_start;
gsd->body_start = NULL;
/* move accept_stat to right place: */
memcpy(p, p + 2, 4);
/* don't wrap in failure case: */
/* Note: counting on not getting here if call was not even
* accepted! */
if (*p != rpc_success) {
resbuf->head[0].iov_len -= 2 * 4;
goto out;
}
p++;
integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
integ_len = resbuf->len - integ_offset;
BUG_ON(integ_len % 4);
*p++ = htonl(integ_len);
*p++ = htonl(gc->gc_seq);
if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset,
integ_len))
BUG();
if (resbuf->page_len == 0
&& resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE
< PAGE_SIZE) {
BUG_ON(resbuf->tail[0].iov_len);
/* Use head for everything */
resv = &resbuf->head[0];
} else if (resbuf->tail[0].iov_base == NULL) {
if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
goto out_err;
resbuf->tail[0].iov_base = resbuf->head[0].iov_base
+ resbuf->head[0].iov_len;
resbuf->tail[0].iov_len = 0;
rqstp->rq_restailpage = 0;
resv = &resbuf->tail[0];
} else {
resv = &resbuf->tail[0];
}
mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
goto out_err;
svc_putu32(resv, htonl(mic.len));
memset(mic.data + mic.len, 0,
round_up_to_quad(mic.len) - mic.len);
resv->iov_len += XDR_QUADLEN(mic.len) << 2;
/* not strictly required: */
resbuf->len += XDR_QUADLEN(mic.len) << 2;
BUG_ON(resv->iov_len > PAGE_SIZE);
out:
stat = 0;
out_err:
return stat;
}
static int
svcauth_gss_release(struct svc_rqst *rqstp)
{
struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc = &gsd->clcred;
struct xdr_buf *resbuf = &rqstp->rq_res;
int stat = -EINVAL;
if (gc->gc_proc != RPC_GSS_PROC_DATA)
goto out;
/* Release can be called twice, but we only wrap once. */
@ -1097,55 +1158,7 @@ svcauth_gss_release(struct svc_rqst *rqstp)
case RPC_GSS_SVC_NONE:
break;
case RPC_GSS_SVC_INTEGRITY:
p = gsd->body_start;
gsd->body_start = NULL;
/* move accept_stat to right place: */
memcpy(p, p + 2, 4);
/* don't wrap in failure case: */
/* Note: counting on not getting here if call was not even
* accepted! */
if (*p != rpc_success) {
resbuf->head[0].iov_len -= 2 * 4;
goto out;
}
p++;
integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
integ_len = resbuf->len - integ_offset;
BUG_ON(integ_len % 4);
*p++ = htonl(integ_len);
*p++ = htonl(gc->gc_seq);
if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset,
integ_len))
BUG();
if (resbuf->page_len == 0
&& resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE
< PAGE_SIZE) {
BUG_ON(resbuf->tail[0].iov_len);
/* Use head for everything */
resv = &resbuf->head[0];
} else if (resbuf->tail[0].iov_base == NULL) {
if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE
> PAGE_SIZE)
goto out_err;
resbuf->tail[0].iov_base =
resbuf->head[0].iov_base
+ resbuf->head[0].iov_len;
resbuf->tail[0].iov_len = 0;
rqstp->rq_restailpage = 0;
resv = &resbuf->tail[0];
} else {
resv = &resbuf->tail[0];
}
mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
goto out_err;
svc_putu32(resv, htonl(mic.len));
memset(mic.data + mic.len, 0,
round_up_to_quad(mic.len) - mic.len);
resv->iov_len += XDR_QUADLEN(mic.len) << 2;
/* not strictly required: */
resbuf->len += XDR_QUADLEN(mic.len) << 2;
BUG_ON(resv->iov_len > PAGE_SIZE);
svcauth_gss_wrap_resp_integ(rqstp);
break;
case RPC_GSS_SVC_PRIVACY:
default: