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Fix an interop issue with Linux: If you do nothing but TCP

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mounts, Linux won't even bother registering nlockmgr for UDP. This
causes nlm_get_rpc to fail, which means any attempts to deliver the
GRANTED callback fail. Add code to nlm_get_rpc to try to locate the
TCP version as well. If it finds it on TCP, it establishes
a clnt_reconnect to the host.

Submitted by:	zachary.loafman at isilon.com
MFC after:	2 weeks
This commit is contained in:
Doug Rabson 2008-08-13 12:03:31 +00:00
parent 94b9bedcb9
commit 88abcb07bd
1 changed files with 115 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

117
sys/nlm/nlm_prot_impl.c
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@ -291,8 +291,11 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
struct timeval timo;
RPCB parms;
char *uaddr;
enum clnt_stat stat;
int rpcvers;
enum clnt_stat stat = RPC_SUCCESS;
int rpcvers = RPCBVERS4;
bool_t do_tcp = FALSE;
struct pmap mapping;
u_short port = 0;
/*
* First we need to contact the remote RPCBIND service to find
@ -322,12 +325,16 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
}
rpcb = clnt_dg_create(so, (struct sockaddr *)&ss,
RPCBPROG, RPCBVERS4, 0, 0);
RPCBPROG, rpcvers, 0, 0);
if (!rpcb)
return (NULL);
try_tcp:
parms.r_prog = prog;
parms.r_vers = vers;
if (do_tcp)
parms.r_netid = "tcp";
else
parms.r_netid = "udp";
parms.r_addr = "";
parms.r_owner = "";
@ -338,29 +345,28 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
timo.tv_sec = 25;
timo.tv_usec = 0;
again:
switch (rpcvers) {
case RPCBVERS4:
case RPCBVERS:
/*
* Try RPCBIND 4 then 3.
*/
uaddr = NULL;
stat = CLNT_CALL(rpcb, (rpcprog_t) RPCBPROC_GETADDR,
(xdrproc_t) xdr_rpcb, &parms,
(xdrproc_t) xdr_wrapstring, &uaddr, timo);
if (stat == RPC_PROGVERSMISMATCH) {
/*
* Try RPCBIND version 3 if we haven't already.
*
* XXX fall back to portmap?
*/
CLNT_CONTROL(rpcb, CLGET_VERS, &rpcvers);
if (rpcvers == RPCBVERS4) {
if (rpcvers == RPCBVERS4)
rpcvers = RPCBVERS;
else if (rpcvers == RPCBVERS)
rpcvers = PMAPVERS;
CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers);
goto again;
}
}
if (stat == RPC_SUCCESS) {
} else if (stat == RPC_SUCCESS) {
/*
* We have a reply from the remote RPCBIND - turn it into an
* appropriate address and make a new client that can talk to
* the remote NLM.
* We have a reply from the remote RPCBIND - turn it
* into an appropriate address and make a new client
* that can talk to the remote NLM.
*
* XXX fixup IPv6 scope ID.
*/
@ -374,19 +380,15 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
free(a->buf, M_RPC);
free(a, M_RPC);
xdr_free((xdrproc_t) xdr_wrapstring, &uaddr);
} else if (stat == RPC_PROGVERSMISMATCH) {
}
break;
case PMAPVERS:
/*
* Try portmap.
*/
struct pmap mapping;
u_short port;
rpcvers = PMAPVERS;
CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers);
mapping.pm_prog = parms.r_prog;
mapping.pm_vers = parms.r_vers;
mapping.pm_prot = IPPROTO_UDP;
mapping.pm_prot = do_tcp ? IPPROTO_TCP : IPPROTO_UDP;
mapping.pm_port = 0;
stat = CLNT_CALL(rpcb, (rpcprog_t) PMAPPROC_GETPORT,
@ -408,14 +410,72 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
#endif
}
}
break;
default:
panic("invalid rpcvers %d", rpcvers);
}
if (stat != RPC_SUCCESS) {
printf("NLM: failed to contact remote rpcbind, stat = %d\n",
(int) stat);
/*
* We may have a positive response from the portmapper, but the NLM
* service was not found. Make sure we received a valid port.
*/
switch (ss.ss_family) {
case AF_INET:
port = ((struct sockaddr_in *)&ss)->sin_port;
break;
#ifdef INET6
case AF_INET6:
port = ((struct sockaddr_in6 *)&ss)->sin6_port;
break;
#endif
}
if (stat != RPC_SUCCESS || !port) {
/*
* If we were able to talk to rpcbind or portmap, but the udp
* variant wasn't available, ask about tcp.
*
* XXX - We could also check for a TCP portmapper, but
* if the host is running a portmapper at all, we should be able
* to hail it over UDP.
*/
if (stat == RPC_SUCCESS && !do_tcp) {
do_tcp = TRUE;
goto try_tcp;
}
/* Otherwise, bad news. */
printf("NLM: failed to contact remote rpcbind, "
"stat = %d, port = %d\n",
(int) stat, port);
CLNT_DESTROY(rpcb);
return (NULL);
}
if (do_tcp) {
/*
* Destroy the UDP client we used to speak to rpcbind and
* recreate as a TCP client.
*/
struct netconfig *nconf = NULL;
CLNT_DESTROY(rpcb);
switch (ss.ss_family) {
case AF_INET:
nconf = getnetconfigent("tcp");
break;
#ifdef INET6
case AF_INET6:
nconf = getnetconfigent("tcp6");
break;
#endif
}
rpcb = clnt_reconnect_create(nconf, (struct sockaddr *)&ss,
prog, vers, 0, 0);
CLNT_CONTROL(rpcb, CLSET_WAITCHAN, &wchan);
rpcb->cl_auth = nlm_auth;
} else {
/*
* Re-use the client we used to speak to rpcbind.
*/
@ -424,6 +484,7 @@ nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers)
CLNT_CONTROL(rpcb, CLSET_VERS, &vers);
CLNT_CONTROL(rpcb, CLSET_WAITCHAN, &wchan);
rpcb->cl_auth = nlm_auth;
}
return (rpcb);
}