/**
* probe_bothports - discover the RPC endpoints of mountd and NFS server
* @mnt_server: pointer to address and pmap argument for mountd results
* @nfs_server: pointer to address and pmap argument for NFS server
*
* This is the legacy API that takes "clnt_addr_t" for both servers,
* but supports only AF_INET addresses.
*
* Returns 1 and fills in the pmap field in both clnt_addr_t structs
* if the requested service ports are unambiguous and pingable.
* Otherwise zero is returned; rpccreateerr.cf_stat is set to reflect
* the nature of the error.
*/
int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
{
return nfs_probe_bothports((struct sockaddr *)&mnt_server->saddr,
sizeof(mnt_server->saddr),
&mnt_server->pmap,
(struct sockaddr *)&nfs_server->saddr,
sizeof(nfs_server->saddr),
&nfs_server->pmap);
}
/*
* Reconstruct the mount option string based on a portmapper probe
* of the server. Returns one if the server's portmapper returned
* something we can use, otherwise zero.
*
* To handle version and transport protocol fallback properly, we
* need to parse some of the mount options in order to set up a
* portmap probe. Mount options that nfs_rewrite_pmap_mount_options()
* doesn't recognize are left alone.
*
* Returns TRUE if rewriting was successful; otherwise
* FALSE is returned if some failure occurred.
*/
static int
nfs_rewrite_pmap_mount_options(struct mount_options *options, int checkv4,
struct local_bind_info *local_ip)
{
union nfs_sockaddr nfs_address;
struct sockaddr *nfs_saddr = &nfs_address.sa;
socklen_t nfs_salen = sizeof(nfs_address);
struct pmap nfs_pmap;
union nfs_sockaddr mnt_address;
struct sockaddr *mnt_saddr = &mnt_address.sa;
socklen_t mnt_salen = sizeof(mnt_address);
unsigned long protocol;
struct pmap mnt_pmap;
/*
* Version and transport negotiation is not required
* and does not work for RDMA mounts.
*/
if (!nfs_nfs_protocol(options, &protocol)) {
errno = EINVAL;
return 0;
}
if (protocol == NFSPROTO_RDMA)
goto out;
/*
* Extract just the options needed to contact server.
* Bail now if any of these have bad values.
*/
if (!nfs_extract_server_addresses(options, nfs_saddr, &nfs_salen,
mnt_saddr, &mnt_salen)) {
errno = EINVAL;
return 0;
}
if (!nfs_options2pmap(options, &nfs_pmap, &mnt_pmap)) {
errno = EINVAL;
return 0;
}
/*
* The kernel NFS client doesn't support changing the RPC
* program number for these services, so force the value of
* these fields before probing the server's ports.
*/
nfs_pmap.pm_prog = NFS_PROGRAM;
mnt_pmap.pm_prog = MOUNTPROG;
/*
* If the server's rpcbind service isn't available, we can't
* negotiate. Bail now if we can't contact it.
*/
if (!nfs_probe_bothports(mnt_saddr, mnt_salen, &mnt_pmap,
nfs_saddr, nfs_salen, &nfs_pmap, checkv4,
local_ip)) {
errno = ESPIPE;
if (rpc_createerr.cf_stat == RPC_PROGNOTREGISTERED)
errno = EOPNOTSUPP;
else if (rpc_createerr.cf_stat == RPC_AUTHERROR)
errno = EACCES;
else if (rpc_createerr.cf_stat == RPC_TIMEDOUT)
errno = ETIMEDOUT;
else if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH)
errno = EPROTONOSUPPORT;
else if (rpc_createerr.cf_error.re_errno != 0)
errno = rpc_createerr.cf_error.re_errno;
return 0;
}
if (!nfs_construct_new_options(options, nfs_saddr, &nfs_pmap,
mnt_saddr, &mnt_pmap)) {
if (rpc_createerr.cf_stat == RPC_UNKNOWNPROTO)
errno = EPROTONOSUPPORT;
else
errno = EINVAL;
return 0;
}
out:
errno = 0;
return 1;
}
