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SUNRPC/nfs: Fix return value for nfs4_callback_compound() 

RPC server procedures are normally expected to return a __be32 encoded
status value of type 'enum rpc_accept_stat', however at least one function
wants to return an authentication status of type 'enum rpc_auth_stat'
in the case where authentication fails.
This patch adds functionality to allow this.

Fixes: a4e187d83d ("NFS: Don't drop CB requests with invalid principals")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2019-04-09 11:46:14 -04:00 committed by J. Bruce Fields
parent 8a9f4f4124
commit 83dd59a0b9
3 changed files with 25 additions and 6 deletions
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2
fs/nfs/callback_xdr.c
View File

@ -983,7 +983,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
out_invalidcred:
pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
return rpc_autherr_badcred;
return svc_return_autherr(rqstp, rpc_autherr_badcred);
}
/*

2
include/linux/sunrpc/svc.h
View File

@ -271,6 +271,7 @@ struct svc_rqst {
#define RQ_VICTIM (5) /* about to be shut down */
#define RQ_BUSY (6) /* request is busy */
#define RQ_DATA (7) /* request has data */
#define RQ_AUTHERR (8) /* Request status is auth error */
unsigned long rq_flags; /* flags field */
ktime_t rq_qtime; /* enqueue time */
@ -504,6 +505,7 @@ unsigned int svc_fill_write_vector(struct svc_rqst *rqstp,
char *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
struct kvec *first, void *p,
size_t total);
__be32 svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err);
#define RPC_MAX_ADDRBUFLEN (63U)

27
net/sunrpc/svc.c
View File

@ -1144,6 +1144,22 @@ void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
#endif
__be32
svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err)
{
set_bit(RQ_AUTHERR, &rqstp->rq_flags);
return auth_err;
}
EXPORT_SYMBOL_GPL(svc_return_autherr);
static __be32
svc_get_autherr(struct svc_rqst *rqstp, __be32 *statp)
{
if (test_and_clear_bit(RQ_AUTHERR, &rqstp->rq_flags))
return *statp;
return rpc_auth_ok;
}
/*
* Common routine for processing the RPC request.
*/
@ -1290,11 +1306,9 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
procp->pc_release(rqstp);
goto dropit;
}
if (*statp == rpc_autherr_badcred) {
if (procp->pc_release)
procp->pc_release(rqstp);
goto err_bad_auth;
}
auth_stat = svc_get_autherr(rqstp, statp);
if (auth_stat != rpc_auth_ok)
goto err_release_bad_auth;
if (*statp == rpc_success && procp->pc_encode &&
!procp->pc_encode(rqstp, resv->iov_base + resv->iov_len)) {
dprintk("svc: failed to encode reply\n");
@ -1351,6 +1365,9 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
svc_putnl(resv, 2);
goto sendit;
err_release_bad_auth:
if (procp->pc_release)
procp->pc_release(rqstp);
err_bad_auth:
dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
serv->sv_stats->rpcbadauth++;