/* $NetBSD: nfs_syscalls.c,v 1.164 2024/07/05 04:31:54 rin Exp $ */

/* $NetBSD: nfs_syscalls.c,v 1.164 2024/07/05 04:31:54 rin Exp $ */

/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_syscalls.c,v 1.164 2024/07/05 04:31:54 rin Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/kmem.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/signalvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/namei.h>
#include <sys/syslog.h>
#include <sys/filedesc.h>
#include <sys/kthread.h>
#include <sys/kauth.h>
#include <sys/syscallargs.h>
#include <sys/cprng.h>
#include <sys/rbtree.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#include <nfs/xdr_subs.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsrvcache.h>
#include <nfs/nfsmount.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsrtt.h>
#include <nfs/nfs_var.h>

extern int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *,
struct nfssvc_sock *,
struct lwp *, struct mbuf **);
extern int nfsrvw_procrastinate;
extern int nuidhash_max;

static int nfs_numnfsd = 0;
static struct nfsdrt nfsdrt;
kmutex_t nfsd_lock;
struct nfssvc_sockhead nfssvc_sockhead;
kcondvar_t nfsd_initcv;
struct nfssvc_sockhead nfssvc_sockpending;
struct nfsdidlehead nfsd_idle_head;

static rb_tree_t nfsd_tree;
static const rb_tree_ops_t nfsd_tree_ops;

int nfssvc_sockhead_flag;
int nfsd_head_flag;

struct nfssvc_sock *nfs_udpsock;
struct nfssvc_sock *nfs_udp6sock;

static struct nfssvc_sock *nfsrv_sockalloc(void);
static void nfsrv_sockfree(struct nfssvc_sock *);
static void nfsd_rt(int, struct nfsrv_descript *, int);
static int nfssvc_nfsd(struct nfssvc_copy_ops *, struct nfsd_srvargs *, void *,
struct lwp *);

static int nfsd_compare_nodes(void *, const void *, const void *);
static int nfsd_compare_key(void *, const void *, const void *);

static struct nfsd *nfsd_bake_cookie(struct nfsd *);
static void nfsd_toss_cookie(struct nfsd *);
static struct nfsd *nfsd_get(struct nfsd *);

static int nfssvc_addsock_in(struct nfsd_args *, const void *);
static int nfssvc_setexports_in(struct mountd_exports_list *, const void *);
static int nfssvc_nsd_in(struct nfsd_srvargs *, const void *);
static int nfssvc_nsd_out(void *, const struct nfsd_srvargs *);
static int nfssvc_exp_in(struct export_args *, const void *, size_t);

static const rb_tree_ops_t nfsd_tree_ops = {
.rbto_compare_nodes = nfsd_compare_nodes,
.rbto_compare_key = nfsd_compare_key,
.rbto_node_offset = offsetof(struct nfsd, nfsd_node),
};

static int
nfsd_compare_nodes(void *cookie, const void *va, const void *vb)
{
const struct nfsd *na = va;
const struct nfsd *nb = vb;

if (na->nfsd_cookie < nb->nfsd_cookie)
return -1;
if (na->nfsd_cookie > nb->nfsd_cookie)
return +1;
return 0;
}

static int
nfsd_compare_key(void *cookie, const void *vn, const void *vk)
{
const struct nfsd *n = vn;
const uint32_t *k = vk;

if (n->nfsd_cookie < *k)
return -1;
if (n->nfsd_cookie > *k)
return +1;
return 0;
}

/*
* nfsd_bake_cookie(nfsd)
*
* Bake a cookie for nfsd, hang it on the tree of nfsds, and
* return a userland-safe pointer nfsdu neatly packed for
* transport in struct nfsd_srvargs::nsd_nfsd.
*/
static struct nfsd *
nfsd_bake_cookie(struct nfsd *nfsd)
{

KASSERT(mutex_owned(&nfsd_lock));

do {
nfsd->nfsd_cookie = cprng_fast32();
} while (nfsd->nfsd_cookie == 0 ||
rb_tree_insert_node(&nfsd_tree, nfsd) != nfsd);

return (struct nfsd *)(uintptr_t)nfsd->nfsd_cookie;
}

/*
* nfsd_toss_cookie(nfsd)
*
* Toss nfsd's cookie.
*/
static void
nfsd_toss_cookie(struct nfsd *nfsd)
{

KASSERT(mutex_owned(&nfsd_lock));
KASSERT(nfsd->nfsd_cookie != 0);

rb_tree_remove_node(&nfsd_tree, nfsd);
nfsd->nfsd_cookie = 0; /* paranoia */
}

/*
* nfsd_get(nfsdu)
*
* Return the struct nfsd pointer for the userland nfsdu cookie,
* as stored in struct nfsd_srvargs::nsd_nfsd, or NULL if nfsdu is
* not a current valid nfsd cookie.
*
* Caller MUST NOT hold nfsd_lock. Caller MUST NOT pass (struct
* nfsd *)(uintptr_t)0, which is the sentinel value for no nfsd
* cookie, for which the caller should check first.
*/
static struct nfsd *
nfsd_get(struct nfsd *nfsdu)
{
uintptr_t cookie = (uintptr_t)nfsdu;
uint32_t key;
struct nfsd *nfsd;

KASSERT(cookie != 0);
if (cookie > UINT32_MAX)
return NULL;
key = cookie;

mutex_enter(&nfsd_lock);
nfsd = rb_tree_find_node(&nfsd_tree, &key);
mutex_exit(&nfsd_lock);

return nfsd;
}

static int
nfssvc_addsock_in(struct nfsd_args *nfsdarg, const void *argp)
{

return copyin(argp, nfsdarg, sizeof *nfsdarg);
}

static int
nfssvc_setexports_in(struct mountd_exports_list *mel, const void *argp)
{

return copyin(argp, mel, sizeof *mel);
}

static int
nfssvc_nsd_in(struct nfsd_srvargs *nsd, const void *argp)
{

return copyin(argp, nsd, sizeof *nsd);
}

static int
nfssvc_nsd_out(void *argp, const struct nfsd_srvargs *nsd)
{

return copyout(nsd, argp, sizeof *nsd);
}

static int
nfssvc_exp_in(struct export_args *exp, const void *argp, size_t nexports)
{

return copyin(argp, exp, sizeof(*exp) * nexports);
}

/*
* NFS server system calls
*/

static struct nfssvc_copy_ops native_ops = {
.addsock_in = nfssvc_addsock_in,
.setexports_in = nfssvc_setexports_in,
.nsd_in = nfssvc_nsd_in,
.nsd_out = nfssvc_nsd_out,
.exp_in = nfssvc_exp_in,
};

/*
* Nfs server pseudo system call for the nfsd's
* Based on the flag value it either:
* - adds a socket to the selection list
* - remains in the kernel as an nfsd
* - remains in the kernel as an nfsiod
*/

int
sys_nfssvc(struct lwp *l, const struct sys_nfssvc_args *uap, register_t *retval)
{
/* {
syscallarg(int) flag;
syscallarg(void *) argp;
} */
int flag = SCARG(uap, flag);
void *argp = SCARG(uap, argp);

return do_nfssvc(&native_ops, l, flag, argp, retval);
}

int
do_nfssvc(struct nfssvc_copy_ops *ops, struct lwp *l, int flag, void *argp, register_t *retval)
{
int error;
file_t *fp;
struct mbuf *nam;
struct nfsd_args nfsdarg;
struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
struct nfsd *nfsd = NULL;
struct nfssvc_sock *slp;
struct nfsuid *nuidp;

error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_NFS,
KAUTH_REQ_NETWORK_NFS_SVC, NULL, NULL, NULL);
if (error)
return (error);

mutex_enter(&nfsd_lock);
while (nfssvc_sockhead_flag & SLP_INIT) {
cv_wait(&nfsd_initcv, &nfsd_lock);
}
mutex_exit(&nfsd_lock);

if (flag & NFSSVC_BIOD) {
/* Dummy implementation of nfsios for 1.4 and earlier. */
error = kpause("nfsbiod", true, 0, NULL);
} else if (flag & NFSSVC_MNTD) {
error = ENOSYS;
} else if (flag & NFSSVC_ADDSOCK) {
error = ops->addsock_in(&nfsdarg, argp);
if (error)
return (error);
/* getsock() will use the descriptor for us */
if ((fp = fd_getfile(nfsdarg.sock)) == NULL)
return (EBADF);
if (fp->f_type != DTYPE_SOCKET) {
fd_putfile(nfsdarg.sock);
return (ENOTSOCK);
}
/*
* Get the client address for connected sockets.
*/
if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
nam = (struct mbuf *)0;
else {
error = sockargs(&nam, nfsdarg.name, nfsdarg.namelen,
UIO_USERSPACE, MT_SONAME);
if (error) {
fd_putfile(nfsdarg.sock);
return (error);
}
}
error = nfssvc_addsock(fp, nam);
fd_putfile(nfsdarg.sock);
} else if (flag & (NFSSVC_SETEXPORTSLIST | NFSSVC_REPLACEEXPORTSLIST)) {
struct export_args *args;
struct mountd_exports_list mel;

error = ops->setexports_in(&mel, argp);
if (error != 0)
return error;

args = (struct export_args *)malloc(mel.mel_nexports *
sizeof(struct export_args), M_TEMP, M_WAITOK);
error = ops->exp_in(args, mel.mel_exports, mel.mel_nexports);
if (error != 0) {
free(args, M_TEMP);
return error;
}
mel.mel_exports = args;

error = mountd_set_exports_list(&mel, l, NULL,
flag & (NFSSVC_SETEXPORTSLIST | NFSSVC_REPLACEEXPORTSLIST));

free(args, M_TEMP);
} else {
error = ops->nsd_in(nsd, argp);
if (error)
return (error);
if ((uintptr_t)nsd->nsd_nfsd != 0 &&
(nfsd = nfsd_get(nsd->nsd_nfsd)) == NULL)
return (EINVAL);
if ((flag & NFSSVC_AUTHIN) &&
nfsd != NULL &&
(nfsd->nfsd_slp->ns_flags & SLP_VALID)) {
slp = nfsd->nfsd_slp;

/*
* First check to see if another nfsd has already
* added this credential.
*/
LIST_FOREACH(nuidp, NUIDHASH(slp, nsd->nsd_cr.cr_uid),
nu_hash) {
if (kauth_cred_geteuid(nuidp->nu_cr) ==
nsd->nsd_cr.cr_uid &&
(!nfsd->nfsd_nd->nd_nam2 ||
netaddr_match(NU_NETFAM(nuidp),
&nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
break;
}
if (nuidp) {
kauth_cred_hold(nuidp->nu_cr);
nfsd->nfsd_nd->nd_cr = nuidp->nu_cr;
nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
} else {
/*
* Nope, so we will.
*/
if (slp->ns_numuids < nuidhash_max) {
slp->ns_numuids++;
nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP);
} else
nuidp = (struct nfsuid *)0;
if ((slp->ns_flags & SLP_VALID) == 0) {
if (nuidp)
kmem_free(nuidp, sizeof(*nuidp));
} else {
if (nuidp == (struct nfsuid *)0) {
nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
LIST_REMOVE(nuidp, nu_hash);
TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
nu_lru);
if (nuidp->nu_flag & NU_NAM)
m_freem(nuidp->nu_nam);
}
nuidp->nu_flag = 0;
kauth_uucred_to_cred(nuidp->nu_cr,
&nsd->nsd_cr);
nuidp->nu_timestamp = nsd->nsd_timestamp;
nuidp->nu_expire = time_second + nsd->nsd_ttl;
/*
* and save the session key in nu_key.
*/
memcpy(nuidp->nu_key, nsd->nsd_key,
sizeof(nsd->nsd_key));
if (nfsd->nfsd_nd->nd_nam2) {
struct sockaddr_in *saddr;

saddr = mtod(nfsd->nfsd_nd->nd_nam2,
struct sockaddr_in *);
switch (saddr->sin_family) {
case AF_INET:
nuidp->nu_flag |= NU_INETADDR;
nuidp->nu_inetaddr =
saddr->sin_addr.s_addr;
break;
case AF_INET6:
nuidp->nu_flag |= NU_NAM;
nuidp->nu_nam = m_copym(
nfsd->nfsd_nd->nd_nam2, 0,
M_COPYALL, M_WAIT);
break;
default:
kmem_free(nuidp, sizeof(*nuidp));
return EAFNOSUPPORT;
};
}
TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
nu_lru);
LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
nuidp, nu_hash);
kauth_cred_hold(nuidp->nu_cr);
nfsd->nfsd_nd->nd_cr = nuidp->nu_cr;
nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
}
}
}
if ((flag & NFSSVC_AUTHINFAIL) &&
nfsd != NULL)
nfsd->nfsd_flag |= NFSD_AUTHFAIL;
error = nfssvc_nfsd(ops, nsd, argp, l);
}
if (error == EINTR || error == ERESTART)
error = 0;
return (error);
}

static struct nfssvc_sock *
nfsrv_sockalloc(void)
{
struct nfssvc_sock *slp;

slp = kmem_alloc(sizeof(*slp), KM_SLEEP);
memset(slp, 0, sizeof (struct nfssvc_sock));
mutex_init(&slp->ns_lock, MUTEX_DRIVER, IPL_SOFTNET);
mutex_init(&slp->ns_alock, MUTEX_DRIVER, IPL_SOFTNET);
cv_init(&slp->ns_cv, "nfsdsock");
TAILQ_INIT(&slp->ns_uidlruhead);
LIST_INIT(&slp->ns_tq);
SIMPLEQ_INIT(&slp->ns_sendq);
mutex_enter(&nfsd_lock);
TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
mutex_exit(&nfsd_lock);

return slp;
}

static void
nfsrv_sockfree(struct nfssvc_sock *slp)
{

KASSERT(slp->ns_so == NULL);
KASSERT(slp->ns_fp == NULL);
KASSERT((slp->ns_flags & SLP_VALID) == 0);
mutex_destroy(&slp->ns_lock);
mutex_destroy(&slp->ns_alock);
cv_destroy(&slp->ns_cv);
kmem_free(slp, sizeof(*slp));
}

/*
* Adds a socket to the list for servicing by nfsds.
*/
int
nfssvc_addsock(file_t *fp, struct mbuf *mynam)
{
int siz;
struct nfssvc_sock *slp;
struct socket *so;
struct nfssvc_sock *tslp;
int error;
int val;

so = fp->f_socket;
tslp = (struct nfssvc_sock *)0;
/*
* Add it to the list, as required.
*/
if (so->so_proto->pr_protocol == IPPROTO_UDP) {
if (so->so_proto->pr_domain->dom_family == AF_INET6)
tslp = nfs_udp6sock;
else {
tslp = nfs_udpsock;
if (tslp->ns_flags & SLP_VALID) {
m_freem(mynam);
return (EPERM);
}
}
}
if (so->so_type == SOCK_STREAM)
siz = NFS_MAXPACKET + sizeof (u_long);
else
siz = NFS_MAXPACKET;
solock(so);
error = soreserve(so, siz, siz);
sounlock(so);
if (error) {
m_freem(mynam);
return (error);
}

/*
* Set protocol specific options { for now TCP only } and
* reserve some space. For datagram sockets, this can get called
* repeatedly for the same socket, but that isn't harmful.
*/
if (so->so_type == SOCK_STREAM) {
val = 1;
so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val,
sizeof(val));
}
if ((so->so_proto->pr_domain->dom_family == AF_INET ||
so->so_proto->pr_domain->dom_family == AF_INET6) &&
so->so_proto->pr_protocol == IPPROTO_TCP) {
val = 1;
so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val,
sizeof(val));
}
solock(so);
so->so_rcv.sb_flags &= ~SB_NOINTR;
so->so_rcv.sb_timeo = 0;
so->so_snd.sb_flags &= ~SB_NOINTR;
so->so_snd.sb_timeo = 0;
sounlock(so);
if (tslp) {
slp = tslp;
} else {
slp = nfsrv_sockalloc();
}
slp->ns_so = so;
slp->ns_nam = mynam;
mutex_enter(&fp->f_lock);
fp->f_count++;
mutex_exit(&fp->f_lock);
slp->ns_fp = fp;
slp->ns_flags = SLP_VALID;
slp->ns_aflags = SLP_A_NEEDQ;
slp->ns_gflags = 0;
slp->ns_sflags = 0;
solock(so);
so->so_upcallarg = (void *)slp;
so->so_upcall = nfsrv_soupcall;
so->so_rcv.sb_flags |= SB_UPCALL;
sounlock(so);
nfsrv_wakenfsd(slp);
return (0);
}

/*
* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
* until it is killed by a signal.
*/
static int
nfssvc_nfsd(struct nfssvc_copy_ops *ops, struct nfsd_srvargs *nsd,
void *argp, struct lwp *l)
{
struct timeval tv;
struct mbuf *m;
struct nfssvc_sock *slp;
struct nfsd *nfsd;
struct nfsrv_descript *nd = NULL;
struct mbuf *mreq;
u_quad_t cur_usec;
int error = 0, cacherep, siz, sotype, writes_todo;
struct proc *p = l->l_proc;
bool doreinit;

#ifndef nolint
cacherep = RC_DOIT;
writes_todo = 0;
#endif
/*
* If userland didn't provide an nfsd cookie, bake a fresh one;
* if they did provide one, look it up.
*/
if ((uintptr_t)nsd->nsd_nfsd == 0) {
nfsd = kmem_alloc(sizeof(*nfsd), KM_SLEEP);
memset(nfsd, 0, sizeof (struct nfsd));
cv_init(&nfsd->nfsd_cv, "nfsd");
nfsd->nfsd_procp = p;
mutex_enter(&nfsd_lock);
while ((nfssvc_sockhead_flag & SLP_INIT) != 0) {
KASSERT(nfs_numnfsd == 0);
cv_wait(&nfsd_initcv, &nfsd_lock);
}
nsd->nsd_nfsd = nfsd_bake_cookie(nfsd);
nfs_numnfsd++;
mutex_exit(&nfsd_lock);
} else if ((nfsd = nfsd_get(nsd->nsd_nfsd)) == NULL) {
return (EINVAL);
}
KASSERT(nfsd != NULL);
KASSERT(nsd->nsd_nfsd != (struct nfsd *)(uintptr_t)0);

/*
* Loop getting rpc requests until SIGKILL.
*/
for (;;) {
bool dummy;

preempt_point();

if (nfsd->nfsd_slp == NULL) {
mutex_enter(&nfsd_lock);
while (nfsd->nfsd_slp == NULL &&
(nfsd_head_flag & NFSD_CHECKSLP) == 0) {
SLIST_INSERT_HEAD(&nfsd_idle_head, nfsd,
nfsd_idle);
error = cv_wait_sig(&nfsd->nfsd_cv, &nfsd_lock);
if (error) {
slp = nfsd->nfsd_slp;
nfsd->nfsd_slp = NULL;
if (!slp)
SLIST_REMOVE(&nfsd_idle_head,
nfsd, nfsd, nfsd_idle);
mutex_exit(&nfsd_lock);
if (slp) {
nfsrv_wakenfsd(slp);
nfsrv_slpderef(slp);
}
goto done;
}
}
if (nfsd->nfsd_slp == NULL &&
(nfsd_head_flag & NFSD_CHECKSLP) != 0) {
slp = TAILQ_FIRST(&nfssvc_sockpending);
if (slp) {
KASSERT((slp->ns_gflags & SLP_G_DOREC)
!= 0);
TAILQ_REMOVE(&nfssvc_sockpending, slp,
ns_pending);
slp->ns_gflags &= ~SLP_G_DOREC;
slp->ns_sref++;
nfsd->nfsd_slp = slp;
} else
nfsd_head_flag &= ~NFSD_CHECKSLP;
}
KASSERT(nfsd->nfsd_slp == NULL ||
nfsd->nfsd_slp->ns_sref > 0);
mutex_exit(&nfsd_lock);
if ((slp = nfsd->nfsd_slp) == NULL)
continue;
if (slp->ns_flags & SLP_VALID) {
bool more;

if (nfsdsock_testbits(slp, SLP_A_NEEDQ)) {
nfsrv_rcv(slp);
}
if (nfsdsock_testbits(slp, SLP_A_DISCONN)) {
nfsrv_zapsock(slp);
}
error = nfsrv_dorec(slp, nfsd, &nd, &more);
getmicrotime(&tv);
cur_usec = (u_quad_t)tv.tv_sec * 1000000 +
(u_quad_t)tv.tv_usec;
writes_todo = 0;
if (error) {
struct nfsrv_descript *nd2;

mutex_enter(&nfsd_lock);
nd2 = LIST_FIRST(&slp->ns_tq);
if (nd2 != NULL &&
nd2->nd_time <= cur_usec) {
error = 0;
cacherep = RC_DOIT;
writes_todo = 1;
}
mutex_exit(&nfsd_lock);
}
if (error == 0 && more) {
nfsrv_wakenfsd(slp);
}
}
} else {
error = 0;
slp = nfsd->nfsd_slp;
}
KASSERT(slp != NULL);
KASSERT(nfsd->nfsd_slp == slp);
if (error || (slp->ns_flags & SLP_VALID) == 0) {
if (nd) {
nfsdreq_free(nd);
nd = NULL;
}
nfsd->nfsd_slp = NULL;
nfsrv_slpderef(slp);
continue;
}
sotype = slp->ns_so->so_type;
if (nd) {
getmicrotime(&nd->nd_starttime);
if (nd->nd_nam2)
nd->nd_nam = nd->nd_nam2;
else
nd->nd_nam = slp->ns_nam;

/*
* Check to see if authorization is needed.
*/
if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
nsd->nsd_haddr = mtod(nd->nd_nam,
struct sockaddr_in *)->sin_addr.s_addr;
nsd->nsd_authlen = nfsd->nfsd_authlen;
nsd->nsd_verflen = nfsd->nfsd_verflen;
if (!copyout(nfsd->nfsd_authstr,
nsd->nsd_authstr, nfsd->nfsd_authlen) &&
!copyout(nfsd->nfsd_verfstr,
nsd->nsd_verfstr, nfsd->nfsd_verflen) &&
!ops->nsd_out(argp, nsd)) {
return (ENEEDAUTH);
}
cacherep = RC_DROPIT;
} else
cacherep = nfsrv_getcache(nd, slp, &mreq);

if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
nd->nd_procnum = NFSPROC_NOOP;
nd->nd_repstat =
(NFSERR_AUTHERR | AUTH_TOOWEAK);
cacherep = RC_DOIT;
}
}

/*
* Loop to get all the write rpc relies that have been
* gathered together.
*/
do {
switch (cacherep) {
case RC_DOIT:
mreq = NULL;
netexport_rdlock();
if (writes_todo || nd == NULL ||
(!(nd->nd_flag & ND_NFSV3) &&
nd->nd_procnum == NFSPROC_WRITE &&
nfsrvw_procrastinate > 0))
error = nfsrv_writegather(&nd, slp,
l, &mreq);
else
error =
(*(nfsrv3_procs[nd->nd_procnum]))
(nd, slp, l, &mreq);
netexport_rdunlock();
if (mreq == NULL) {
if (nd != NULL) {
if (nd->nd_nam2)
m_free(nd->nd_nam2);
}
break;
}
if (error) {
nfsstats.srv_errs++;
if (nd) {
nfsrv_updatecache(nd, false,
mreq);
m_freem(nd->nd_nam2);
}
break;
}
if (nd) {
nfsstats.srvrpccnt[nd->nd_procnum]++;
nfsrv_updatecache(nd, true, mreq);
nd->nd_mrep = NULL;
}
/* FALLTHROUGH */
case RC_REPLY:
m = mreq;
siz = 0;
while (m) {
siz += m->m_len;
m = m->m_next;
}
if (siz <= 0 || siz > NFS_MAXPACKET) {
printf("mbuf siz=%d\n",siz);
panic("Bad nfs svc reply");
}
m = mreq;
m->m_pkthdr.len = siz;
m_reset_rcvif(m);
/*
* For stream protocols, prepend a Sun RPC
* Record Mark.
*/
if (sotype == SOCK_STREAM) {
M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
*mtod(m, u_int32_t *) =
htonl(0x80000000 | siz);
}
if (nd) {
nd->nd_mreq = m;
if (nfsrtton) {
nfsd_rt(slp->ns_so->so_type, nd,
cacherep);
}
error = nfsdsock_sendreply(slp, nd);
nd = NULL;
}
if (error == EPIPE)
nfsrv_zapsock(slp);
if (error == EINTR || error == ERESTART) {
nfsd->nfsd_slp = NULL;
nfsrv_slpderef(slp);
goto done;
}
break;
case RC_DROPIT:
if (nd) {
if (nfsrtton)
nfsd_rt(sotype, nd, cacherep);
m_freem(nd->nd_mrep);
m_freem(nd->nd_nam2);
}
break;
}
if (nd) {
nfsdreq_free(nd);
nd = NULL;
}

/*
* Check to see if there are outstanding writes that
* need to be serviced.
*/
getmicrotime(&tv);
cur_usec = (u_quad_t)tv.tv_sec * 1000000 +
(u_quad_t)tv.tv_usec;
mutex_enter(&nfsd_lock);
if (LIST_FIRST(&slp->ns_tq) &&
LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
cacherep = RC_DOIT;
writes_todo = 1;
} else
writes_todo = 0;
mutex_exit(&nfsd_lock);
} while (writes_todo);
if (nfsrv_dorec(slp, nfsd, &nd, &dummy)) {
nfsd->nfsd_slp = NULL;
nfsrv_slpderef(slp);
}
}
done:
mutex_enter(&nfsd_lock);
nfsd_toss_cookie(nfsd);
doreinit = --nfs_numnfsd == 0;
if (doreinit)
nfssvc_sockhead_flag |= SLP_INIT;
mutex_exit(&nfsd_lock);
cv_destroy(&nfsd->nfsd_cv);
kmem_free(nfsd, sizeof(*nfsd));
KASSERT(nsd->nsd_nfsd != (struct nfsd *)(uintptr_t)0);
nsd->nsd_nfsd = (struct nfsd *)(uintptr_t)0;
if (doreinit)
nfsrv_init(true); /* Reinitialize everything */
return (error);
}

/*
* Shut down a socket associated with an nfssvc_sock structure.
* Should be called with the send lock set, if required.
* The trick here is to increment the sref at the start, so that the nfsds
* will stop using it and clear ns_flag at the end so that it will not be
* reassigned during cleanup.
*
* called at splsoftnet.
*/
void
nfsrv_zapsock(struct nfssvc_sock *slp)
{
struct nfsuid *nuidp, *nnuidp;
struct nfsrv_descript *nwp;
struct socket *so;
struct mbuf *m;

if (nfsdsock_drain(slp)) {
return;
}
mutex_enter(&nfsd_lock);
if (slp->ns_gflags & SLP_G_DOREC) {
TAILQ_REMOVE(&nfssvc_sockpending, slp, ns_pending);
slp->ns_gflags &= ~SLP_G_DOREC;
}
mutex_exit(&nfsd_lock);

so = slp->ns_so;
KASSERT(so != NULL);
solock(so);
so->so_upcall = NULL;
so->so_upcallarg = NULL;
so->so_rcv.sb_flags &= ~SB_UPCALL;
soshutdown(so, SHUT_RDWR);
sounlock(so);

m_freem(slp->ns_raw);
m = slp->ns_rec;
while (m != NULL) {
struct mbuf *n;

n = m->m_nextpkt;
m_freem(m);
m = n;
}
/* XXX what about freeing ns_frag ? */
for (nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); nuidp != 0;
nuidp = nnuidp) {
nnuidp = TAILQ_NEXT(nuidp, nu_lru);
LIST_REMOVE(nuidp, nu_hash);
TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
if (nuidp->nu_flag & NU_NAM)
m_freem(nuidp->nu_nam);
kmem_free(nuidp, sizeof(*nuidp));
}
mutex_enter(&nfsd_lock);
while ((nwp = LIST_FIRST(&slp->ns_tq)) != NULL) {
LIST_REMOVE(nwp, nd_tq);
mutex_exit(&nfsd_lock);
nfsdreq_free(nwp);
mutex_enter(&nfsd_lock);
}
mutex_exit(&nfsd_lock);
}

/*
* Derefence a server socket structure. If it has no more references and
* is no longer valid, you can throw it away.
*/
void
nfsrv_slpderef(struct nfssvc_sock *slp)
{
uint32_t ref;

mutex_enter(&nfsd_lock);
KASSERT(slp->ns_sref > 0);
ref = --slp->ns_sref;
if (ref == 0 && (slp->ns_flags & SLP_VALID) == 0) {
file_t *fp;

KASSERT((slp->ns_gflags & SLP_G_DOREC) == 0);
TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
mutex_exit(&nfsd_lock);

fp = slp->ns_fp;
if (fp != NULL) {
slp->ns_fp = NULL;
KASSERT(fp != NULL);
KASSERT(fp->f_socket == slp->ns_so);
KASSERT(fp->f_count > 0);
closef(fp);
slp->ns_so = NULL;
}

if (slp->ns_nam)
m_free(slp->ns_nam);
nfsrv_sockfree(slp);
} else
mutex_exit(&nfsd_lock);
}

/*
* Initialize the data structures for the server.
* Handshake with any new nfsds starting up to avoid any chance of
* corruption.
*/
void
nfsrv_init(int terminating)
{
struct nfssvc_sock *slp;

if (!terminating) {
mutex_init(&nfsd_lock, MUTEX_DRIVER, IPL_SOFTNET);
cv_init(&nfsd_initcv, "nfsdinit");
}

mutex_enter(&nfsd_lock);
if (!terminating && (nfssvc_sockhead_flag & SLP_INIT) != 0)
panic("nfsd init");
nfssvc_sockhead_flag |= SLP_INIT;

if (terminating) {
KASSERT(SLIST_EMPTY(&nfsd_idle_head));
KASSERT(RB_TREE_MIN(&nfsd_tree) == NULL);
while ((slp = TAILQ_FIRST(&nfssvc_sockhead)) != NULL) {
mutex_exit(&nfsd_lock);
KASSERT(slp->ns_sref == 0);
slp->ns_sref++;
nfsrv_zapsock(slp);
nfsrv_slpderef(slp);
mutex_enter(&nfsd_lock);
}
KASSERT(TAILQ_EMPTY(&nfssvc_sockpending));
mutex_exit(&nfsd_lock);
nfsrv_cleancache(); /* And clear out server cache */
} else {
mutex_exit(&nfsd_lock);
nfs_pub.np_valid = 0;
}

TAILQ_INIT(&nfssvc_sockhead);
TAILQ_INIT(&nfssvc_sockpending);

rb_tree_init(&nfsd_tree, &nfsd_tree_ops);
SLIST_INIT(&nfsd_idle_head);
nfsd_head_flag &= ~NFSD_CHECKSLP;

nfs_udpsock = nfsrv_sockalloc();
nfs_udp6sock = nfsrv_sockalloc();

mutex_enter(&nfsd_lock);
nfssvc_sockhead_flag &= ~SLP_INIT;
cv_broadcast(&nfsd_initcv);
mutex_exit(&nfsd_lock);
}

void
nfsrv_fini(void)
{

nfsrv_init(true);
cv_destroy(&nfsd_initcv);
mutex_destroy(&nfsd_lock);
}

/*
* Add entries to the server monitor log.
*/
static void
nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
{
struct timeval tv;
struct drt *rt;

rt = &nfsdrt.drt[nfsdrt.pos];
if (cacherep == RC_DOIT)
rt->flag = 0;
else if (cacherep == RC_REPLY)
rt->flag = DRT_CACHEREPLY;
else
rt->flag = DRT_CACHEDROP;
if (sotype == SOCK_STREAM)
rt->flag |= DRT_TCP;
if (nd->nd_flag & ND_NFSV3)
rt->flag |= DRT_NFSV3;
rt->proc = nd->nd_procnum;
if (mtod(nd->nd_nam, struct sockaddr *)->sa_family == AF_INET)
rt->ipadr = mtod(nd->nd_nam, struct sockaddr_in *)->sin_addr.s_addr;
else
rt->ipadr = INADDR_ANY;
getmicrotime(&tv);
rt->resptime = ((tv.tv_sec - nd->nd_starttime.tv_sec) * 1000000) +
(tv.tv_usec - nd->nd_starttime.tv_usec);
rt->tstamp = tv;
nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
}