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nfs41: verify session channel attribues 

Invalidate the session if the server returns invalid fore or back channel
attributes.

Use a KERN_WARNING to report the fatal session estabishment error.

Signed-off-by: Andy Adamson <andros@netapp.com>
[refactor nfs4_verify_channel_attrs]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2009-04-01 09:22:32 -04:00 committed by Benny Halevy
parent fc931582c2
commit 8d35301d7d
1 changed files with 48 additions and 2 deletions
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50
fs/nfs/nfs4proc.c
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@ -4409,6 +4409,51 @@ static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
args->bc_attrs.max_reqs);
}
static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
{
if (rcvd <= sent)
return 0;
printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
"sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
return -EINVAL;
}
#define _verify_fore_channel_attr(_name_) \
_verify_channel_attr("fore", #_name_, \
args->fc_attrs._name_, \
session->fc_attrs._name_)
#define _verify_back_channel_attr(_name_) \
_verify_channel_attr("back", #_name_, \
args->bc_attrs._name_, \
session->bc_attrs._name_)
/*
* The server is not allowed to increase the fore channel header pad size,
* maximum response size, or maximum number of operations.
*
* The back channel attributes are only negotiatied down: We send what the
* (back channel) server insists upon.
*/
static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
struct nfs4_session *session)
{
int ret = 0;
ret |= _verify_fore_channel_attr(headerpadsz);
ret |= _verify_fore_channel_attr(max_resp_sz);
ret |= _verify_fore_channel_attr(max_ops);
ret |= _verify_back_channel_attr(headerpadsz);
ret |= _verify_back_channel_attr(max_rqst_sz);
ret |= _verify_back_channel_attr(max_resp_sz);
ret |= _verify_back_channel_attr(max_resp_sz_cached);
ret |= _verify_back_channel_attr(max_ops);
ret |= _verify_back_channel_attr(max_reqs);
return ret;
}
static int _nfs4_proc_create_session(struct nfs_client *clp)
{
struct nfs4_session *session = clp->cl_session;
@ -4431,8 +4476,9 @@ static int _nfs4_proc_create_session(struct nfs_client *clp)
status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
/* Set the negotiated values in the session's channel_attrs struct */
if (!status)
/* Verify the session's negotiated channel_attrs values */
status = nfs4_verify_channel_attrs(&args, session);
if (!status) {
/* Increment the clientid slot sequence id */
clp->cl_seqid++;