nfscl: Disable use of callbacks for NFSv4.0

The only use for callbacks for NFSv4.0 is delegations
and delegations rarely work well for NFSv4.0 anyhow.

Therefore, this patch disables callbacks for the
NFSv4.0 client.  This is the same behavior as
occurred when the nfscbd(8) daemon was not running.

This change allowed a function called nfscl_getmyip()
to be removed from the kernel, which is nice since
maintaining this function was bothersome, due to its
use of routing, etc.

MFC after:	2 weeks

sys/fs/nfs/nfs_commonport.c

@@ -62,7 +62,6 @@ int newnfs_numnfsd = 0;
 struct nfsstatsv1 nfsstatsv1;
 int nfs_numnfscbd = 0;
 int nfscl_debuglevel = 0;
-char nfsv4_callbackaddr[INET6_ADDRSTRLEN];
 int nfsrv_lughashsize = 100;
 struct mtx nfsrv_dslock_mtx;
 struct nfsdevicehead nfsrv_devidhead;
@@ -90,9 +89,6 @@ SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test,
     0, "Number of realign tests done");
 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count,
     0, "Number of mbuf realignments done");
-SYSCTL_STRING(_vfs_nfs, OID_AUTO, callback_addr, CTLFLAG_RW,
-    nfsv4_callbackaddr, sizeof(nfsv4_callbackaddr),
-    "NFSv4 callback addr for server to use");
 SYSCTL_INT(_vfs_nfs, OID_AUTO, debuglevel, CTLFLAG_RW, &nfscl_debuglevel,
     0, "Debug level for NFS client");
 SYSCTL_INT(_vfs_nfs, OID_AUTO, userhashsize, CTLFLAG_RDTUN, &nfsrv_lughashsize,

sys/fs/nfs/nfs_var.h

@@ -373,7 +373,6 @@ int nfsrpc_destroysession(struct nfsmount *, struct nfsclsession *,
 /* nfs_clcomsubs.c */
 int nfsm_uiombuf(struct nfsrv_descript *, struct uio *, int);
 struct mbuf *nfsm_uiombuflist(struct uio *, int, u_int);
-u_int8_t *nfscl_getmyip(struct nfsmount *, struct in6_addr *, int *);
 int nfsm_getfh(struct nfsrv_descript *, struct nfsfh **);
 int nfscl_mtofh(struct nfsrv_descript *, struct nfsfh **,
         struct nfsvattr *, int *);

sys/fs/nfsclient/nfs_clport.c

@@ -34,8 +34,6 @@
  */
 
 #include <sys/cdefs.h>
-#include "opt_inet.h"
-#include "opt_inet6.h"
 
 #include <sys/capsicum.h>
 
@@ -47,11 +45,6 @@
 #include <sys/hash.h>
 #include <sys/sysctl.h>
 #include <fs/nfs/nfsport.h>
-#include <netinet/in_fib.h>
-#include <netinet/if_ether.h>
-#include <netinet6/ip6_var.h>
-#include <net/if_types.h>
-#include <net/route/nhop.h>
 
 #include <fs/nfsclient/nfs_kdtrace.h>
 
@@ -1046,78 +1039,6 @@ nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp,
 	nmp->nm_state |= NFSSTA_GOTFSINFO;
 }
 
-/*
- * Lookups source address which should be used to communicate with
- * @nmp and stores it inside @pdst.
- *
- * Returns 0 on success.
- */
-u_int8_t *
-nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
-{
-#if defined(INET6) || defined(INET)
-	int fibnum;
-
-	fibnum = curthread->td_proc->p_fibnum;
-#endif
-#ifdef INET
-	if (nmp->nm_nam->sa_family == AF_INET) {
-		struct epoch_tracker et;
-		struct nhop_object *nh;
-		struct sockaddr_in *sin;
-		struct in_addr addr = {};
-
-		sin = (struct sockaddr_in *)nmp->nm_nam;
-		NET_EPOCH_ENTER(et);
-		CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
-		nh = fib4_lookup(fibnum, sin->sin_addr, 0, NHR_NONE, 0);
-		if (nh != NULL) {
-			addr = IA_SIN(ifatoia(nh->nh_ifa))->sin_addr;
-			if (IN_LOOPBACK(ntohl(addr.s_addr))) {
-				/* Ignore loopback addresses */
-				nh = NULL;
-			}
-		}
-		CURVNET_RESTORE();
-		NET_EPOCH_EXIT(et);
-
-		if (nh == NULL)
-			return (NULL);
-		*isinet6p = 0;
-		*((struct in_addr *)paddr) = addr;
-
-		return (u_int8_t *)paddr;
-	}
-#endif
-#ifdef INET6
-	if (nmp->nm_nam->sa_family == AF_INET6) {
-		struct epoch_tracker et;
-		struct sockaddr_in6 *sin6;
-		int error;
-
-		sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
-
-		NET_EPOCH_ENTER(et);
-		CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
-		error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
-		    sin6->sin6_scope_id, NULL, paddr, NULL);
-		CURVNET_RESTORE();
-		NET_EPOCH_EXIT(et);
-		if (error != 0)
-			return (NULL);
-
-		if (IN6_IS_ADDR_LOOPBACK(paddr))
-			return (NULL);
-
-		/* Scope is embedded in */
-		*isinet6p = 1;
-
-		return (u_int8_t *)paddr;
-	}
-#endif
-	return (NULL);
-}
-
 /*
  * Copy NFS uid, gids from the cred structure.
  */

sys/fs/nfsclient/nfs_clrpcops.c

@@ -74,7 +74,6 @@ extern struct timeval nfsboottime;
 extern u_int32_t newnfs_false, newnfs_true;
 extern nfstype nfsv34_type[9];
 extern int nfsrv_useacl;
-extern char nfsv4_callbackaddr[INET6_ADDRSTRLEN];
 extern int nfscl_debuglevel;
 extern int nfs_pnfsiothreads;
 extern u_long sb_max_adj;
@@ -1040,13 +1039,10 @@ nfsrpc_setclient(struct nfsmount *nmp, struct nfsclclient *clp, int reclaim,
 	u_int32_t *tl;
 	struct nfsrv_descript nfsd;
 	struct nfsrv_descript *nd = &nfsd;
-	u_int8_t *cp = NULL, *cp2, addr[INET6_ADDRSTRLEN + 9];
-	u_short port;
-	int error, isinet6 = 0, callblen;
+	int error;
 	nfsquad_t confirm;
 	static u_int32_t rev = 0;
 	struct nfsclds *dsp, *odsp;
-	struct in6_addr a6;
 	struct nfsclsession *tsep;
 	struct rpc_reconupcall recon;
 	struct nfscl_reconarg *rcp;
@@ -1204,49 +1200,13 @@ nfsrpc_setclient(struct nfsmount *nmp, struct nfsclclient *clp, int reclaim,
 	(void) nfsm_strtom(nd, clp->nfsc_id, clp->nfsc_idlen);
 
 	/*
-	 * set up the callback address
+	 * Always set the callback address to 0.0.0.0.0.0 so NFSv4.0
+	 * callbacks are disabled.
 	 */
 	NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
 	*tl = txdr_unsigned(NFS_CALLBCKPROG);
-	callblen = strlen(nfsv4_callbackaddr);
-	if (callblen == 0)
-		cp = nfscl_getmyip(nmp, &a6, &isinet6);
-	if (nfscl_enablecallb && nfs_numnfscbd > 0 &&
-	    (callblen > 0 || cp != NULL)) {
-		port = htons(nfsv4_cbport);
-		cp2 = (u_int8_t *)&port;
-#ifdef INET6
-		if ((callblen > 0 &&
-		     strchr(nfsv4_callbackaddr, ':')) || isinet6) {
-			char ip6buf[INET6_ADDRSTRLEN], *ip6add;
-
-			(void) nfsm_strtom(nd, "tcp6", 4);
-			if (callblen == 0) {
-				ip6_sprintf(ip6buf, (struct in6_addr *)cp);
-				ip6add = ip6buf;
-			} else {
-				ip6add = nfsv4_callbackaddr;
-			}
-			snprintf(addr, INET6_ADDRSTRLEN + 9, "%s.%d.%d",
-			    ip6add, cp2[0], cp2[1]);
-		} else
-#endif
-		{
-			(void) nfsm_strtom(nd, "tcp", 3);
-			if (callblen == 0)
-				snprintf(addr, INET6_ADDRSTRLEN + 9,
-				    "%d.%d.%d.%d.%d.%d", cp[0], cp[1],
-				    cp[2], cp[3], cp2[0], cp2[1]);
-			else
-				snprintf(addr, INET6_ADDRSTRLEN + 9,
-				    "%s.%d.%d", nfsv4_callbackaddr,
-				    cp2[0], cp2[1]);
-		}
-		(void) nfsm_strtom(nd, addr, strlen(addr));
-	} else {
-		(void) nfsm_strtom(nd, "tcp", 3);
-		(void) nfsm_strtom(nd, "0.0.0.0.0.0", 11);
-	}
+	(void)nfsm_strtom(nd, "tcp", 3);
+	(void)nfsm_strtom(nd, "0.0.0.0.0.0", 11);
 	NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
 	*tl = txdr_unsigned(clp->nfsc_cbident);
 	nd->nd_flag |= ND_USEGSSNAME;