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4500632f60
The maximum size of a backchannel message on RPC-over-RDMA depends on the connection's inline threshold. Today that threshold is typically 1024 bytes, making the maximum message size 996 bytes. The Linux server's CREATE_SESSION operation checks that the size of callback Calls can be as large as 1044 bytes, to accommodate RPCSEC_GSS. Thus CREATE_SESSION fails if a client advertises the true message size maximum of 996 bytes. But the server's backchannel currently does not support RPCSEC_GSS. The actual maximum size it needs is much smaller. It is safe to reduce the limit to enable NFSv4.1 on RDMA backchannel operation. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
145 lines
2.7 KiB
C
145 lines
2.7 KiB
C
/*
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* linux/net/sunrpc/auth_null.c
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*
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* AUTH_NULL authentication. Really :-)
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/sunrpc/clnt.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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static struct rpc_auth null_auth;
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static struct rpc_cred null_cred;
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static struct rpc_auth *
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nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
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{
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atomic_inc(&null_auth.au_count);
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return &null_auth;
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}
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static void
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nul_destroy(struct rpc_auth *auth)
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{
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}
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/*
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* Lookup NULL creds for current process
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*/
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static struct rpc_cred *
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nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
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{
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if (flags & RPCAUTH_LOOKUP_RCU)
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return &null_cred;
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return get_rpccred(&null_cred);
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}
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/*
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* Destroy cred handle.
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*/
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static void
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nul_destroy_cred(struct rpc_cred *cred)
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{
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}
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/*
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* Match cred handle against current process
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*/
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static int
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nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
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{
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return 1;
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}
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/*
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* Marshal credential.
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*/
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static __be32 *
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nul_marshal(struct rpc_task *task, __be32 *p)
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{
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*p++ = htonl(RPC_AUTH_NULL);
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*p++ = 0;
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*p++ = htonl(RPC_AUTH_NULL);
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*p++ = 0;
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return p;
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}
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/*
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* Refresh credential. This is a no-op for AUTH_NULL
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*/
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static int
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nul_refresh(struct rpc_task *task)
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{
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set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
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return 0;
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}
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static __be32 *
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nul_validate(struct rpc_task *task, __be32 *p)
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{
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rpc_authflavor_t flavor;
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u32 size;
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flavor = ntohl(*p++);
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if (flavor != RPC_AUTH_NULL) {
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printk("RPC: bad verf flavor: %u\n", flavor);
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return ERR_PTR(-EIO);
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}
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size = ntohl(*p++);
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if (size != 0) {
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printk("RPC: bad verf size: %u\n", size);
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return ERR_PTR(-EIO);
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}
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return p;
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}
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const struct rpc_authops authnull_ops = {
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.owner = THIS_MODULE,
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.au_flavor = RPC_AUTH_NULL,
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.au_name = "NULL",
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.create = nul_create,
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.destroy = nul_destroy,
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.lookup_cred = nul_lookup_cred,
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};
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static
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struct rpc_auth null_auth = {
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.au_cslack = NUL_CALLSLACK,
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.au_rslack = NUL_REPLYSLACK,
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.au_ops = &authnull_ops,
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.au_flavor = RPC_AUTH_NULL,
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.au_count = ATOMIC_INIT(0),
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};
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static
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const struct rpc_credops null_credops = {
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.cr_name = "AUTH_NULL",
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.crdestroy = nul_destroy_cred,
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.crbind = rpcauth_generic_bind_cred,
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.crmatch = nul_match,
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.crmarshal = nul_marshal,
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.crrefresh = nul_refresh,
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.crvalidate = nul_validate,
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};
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static
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struct rpc_cred null_cred = {
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.cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
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.cr_auth = &null_auth,
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.cr_ops = &null_credops,
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.cr_count = ATOMIC_INIT(1),
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.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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.cr_magic = RPCAUTH_CRED_MAGIC,
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#endif
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};
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