static void
nfssvc_loss(SVCXPRT *xprt)
{
uint32_t ack;
ack = 0;
SVC_ACK(xprt, &ack);
nfsrc_trimcache(xprt->xp_sockref, ack, 1);
}
static void
nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
{
struct nfsrv_descript nd;
struct nfsrvcache *rp = NULL;
int cacherep, credflavor;
memset(&nd, 0, sizeof(nd));
if (rqst->rq_vers == NFS_VER2) {
if (rqst->rq_proc > NFSV2PROC_STATFS) {
svcerr_noproc(rqst);
svc_freereq(rqst);
goto out;
}
nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
nd.nd_flag = ND_NFSV2;
} else if (rqst->rq_vers == NFS_VER3) {
if (rqst->rq_proc >= NFS_V3NPROCS) {
svcerr_noproc(rqst);
svc_freereq(rqst);
goto out;
}
nd.nd_procnum = rqst->rq_proc;
nd.nd_flag = ND_NFSV3;
} else {
if (rqst->rq_proc != NFSPROC_NULL &&
rqst->rq_proc != NFSV4PROC_COMPOUND) {
svcerr_noproc(rqst);
svc_freereq(rqst);
goto out;
}
nd.nd_procnum = rqst->rq_proc;
nd.nd_flag = ND_NFSV4;
}
/*
* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
* mounts.
*/
nd.nd_mrep = rqst->rq_args;
rqst->rq_args = NULL;
newnfs_realign(&nd.nd_mrep, M_WAITOK);
nd.nd_md = nd.nd_mrep;
nd.nd_dpos = mtod(nd.nd_md, caddr_t);
nd.nd_nam = svc_getrpccaller(rqst);
nd.nd_nam2 = rqst->rq_addr;
nd.nd_mreq = NULL;
nd.nd_cred = NULL;
if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
/* Check if source port is privileged */
u_short port;
struct sockaddr *nam = nd.nd_nam;
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)nam;
/*
* INET/INET6 - same code:
* sin_port and sin6_port are at same offset
*/
port = ntohs(sin->sin_port);
if (port >= IPPORT_RESERVED &&
nd.nd_procnum != NFSPROC_NULL) {
#ifdef INET6
char b6[INET6_ADDRSTRLEN];
#if defined(KLD_MODULE)
/* Do not use ip6_sprintf: the nfs module should work without INET6. */
#define ip6_sprintf(buf, a) \
(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
(a)->s6_addr16[0], (a)->s6_addr16[1], \
(a)->s6_addr16[2], (a)->s6_addr16[3], \
(a)->s6_addr16[4], (a)->s6_addr16[5], \
(a)->s6_addr16[6], (a)->s6_addr16[7]), \
(buf))
#endif
#endif
printf("NFS request from unprivileged port (%s:%d)\n",
#ifdef INET6
sin->sin_family == AF_INET6 ?
ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
#if defined(KLD_MODULE)
#undef ip6_sprintf
#endif
#endif
inet_ntoa(sin->sin_addr), port);
svcerr_weakauth(rqst);
svc_freereq(rqst);
m_freem(nd.nd_mrep);
goto out;
}
}
if (nd.nd_procnum != NFSPROC_NULL) {
if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
svcerr_weakauth(rqst);
svc_freereq(rqst);
m_freem(nd.nd_mrep);
goto out;
}
/* Set the flag based on credflavor */
if (credflavor == RPCSEC_GSS_KRB5) {
nd.nd_flag |= ND_GSS;
} else if (credflavor == RPCSEC_GSS_KRB5I) {
nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
} else if (credflavor == RPCSEC_GSS_KRB5P) {
nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
} else if (credflavor != AUTH_SYS) {
svcerr_weakauth(rqst);
svc_freereq(rqst);
m_freem(nd.nd_mrep);
goto out;
}
#ifdef MAC
mac_cred_associate_nfsd(nd.nd_cred);
#endif
/*
* Get a refcnt (shared lock) on nfsd_suspend_lock.
* NFSSVC_SUSPENDNFSD will take an exclusive lock on
* nfsd_suspend_lock to suspend these threads.
* This must be done here, before the check of
* nfsv4root exports by nfsvno_v4rootexport().
*/
NFSLOCKV4ROOTMUTEX();
nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
NULL);
NFSUNLOCKV4ROOTMUTEX();
if ((nd.nd_flag & ND_NFSV4) != 0) {
nd.nd_repstat = nfsvno_v4rootexport(&nd);
if (nd.nd_repstat != 0) {
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsd_suspend_lock);
NFSUNLOCKV4ROOTMUTEX();
svcerr_weakauth(rqst);
svc_freereq(rqst);
m_freem(nd.nd_mrep);
goto out;
}
}
cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsd_suspend_lock);
NFSUNLOCKV4ROOTMUTEX();
} else {
NFSMGET(nd.nd_mreq);
nd.nd_mreq->m_len = 0;
cacherep = RC_REPLY;
}
if (nd.nd_mrep != NULL)
m_freem(nd.nd_mrep);
if (nd.nd_cred != NULL)
crfree(nd.nd_cred);
if (cacherep == RC_DROPIT) {
if (nd.nd_mreq != NULL)
m_freem(nd.nd_mreq);
svc_freereq(rqst);
goto out;
}
if (nd.nd_mreq == NULL) {
svcerr_decode(rqst);
svc_freereq(rqst);
goto out;
}
if (nd.nd_repstat & NFSERR_AUTHERR) {
svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
if (nd.nd_mreq != NULL)
m_freem(nd.nd_mreq);
} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
svcerr_systemerr(rqst);
}
if (rp != NULL) {
nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
}
svc_freereq(rqst);
out:
NFSEXITCODE(0);
}
/*
* Check the cache and, optionally, do the RPC.
* Return the appropriate cache response.
*/
static int
nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
struct nfsrvcache **rpp)
{
struct thread *td = curthread;
int cacherep = RC_DOIT, isdgram, taglen = -1;
struct mbuf *m;
u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
u_int32_t minorvers = 0;
uint32_t ack;
*rpp = NULL;
if (nd->nd_nam2 == NULL) {
nd->nd_flag |= ND_STREAMSOCK;
isdgram = 0;
} else {
isdgram = 1;
}
/*
* Two cases:
* 1 - For NFSv2 over UDP, if we are near our malloc/mget
* limit, just drop the request. There is no
* NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
* client will timeout/retry over UDP in a little while.
* 2 - nd_repstat == 0 && nd_mreq == NULL, which
* means a normal nfs rpc, so check the cache
*/
if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
nfsrv_mallocmget_limit()) {
cacherep = RC_DROPIT;
} else {
/*
* For NFSv3, play it safe and assume that the client is
* doing retries on the same TCP connection.
*/
if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
ND_STREAMSOCK)
nd->nd_flag |= ND_SAMETCPCONN;
nd->nd_retxid = xid;
nd->nd_tcpconntime = NFSD_MONOSEC;
nd->nd_sockref = xprt->xp_sockref;
if ((nd->nd_flag & ND_NFSV4) != 0)
nfsd_getminorvers(nd, tag, &tagstr, &taglen,
&minorvers);
if ((nd->nd_flag & ND_NFSV41) != 0)
/* NFSv4.1 caches replies in the session slots. */
cacherep = RC_DOIT;
else {
cacherep = nfsrvd_getcache(nd);
ack = 0;
SVC_ACK(xprt, &ack);
nfsrc_trimcache(xprt->xp_sockref, ack, 0);
}
}
/*
* Handle the request. There are three cases.
* RC_DOIT - do the RPC
* RC_REPLY - return the reply already created
* RC_DROPIT - just throw the request away
*/
if (cacherep == RC_DOIT) {
if ((nd->nd_flag & ND_NFSV41) != 0)
nd->nd_xprt = xprt;
nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td);
if ((nd->nd_flag & ND_NFSV41) != 0) {
if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
(nd->nd_flag & ND_SAVEREPLY) != 0) {
/* Cache a copy of the reply. */
m = m_copym(nd->nd_mreq, 0, M_COPYALL,
M_WAITOK);
} else
m = NULL;
if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
nfsrv_cache_session(nd->nd_sessionid,
nd->nd_slotid, nd->nd_repstat, &m);
if (nd->nd_repstat == NFSERR_REPLYFROMCACHE)
nd->nd_repstat = 0;
cacherep = RC_REPLY;
} else {
if (nd->nd_repstat == NFSERR_DONTREPLY)
cacherep = RC_DROPIT;
else
cacherep = RC_REPLY;
*rpp = nfsrvd_updatecache(nd);
}
}
if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
free(tagstr, M_TEMP);
NFSEXITCODE2(0, nd);
return (cacherep);
}
/*
* Check the cache and, optionally, do the RPC.
* Return the appropriate cache response.
*/
static int
nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
struct nfsrvcache **rpp)
{
struct thread *td = curthread;
int cacherep = RC_DOIT, isdgram;
uint32_t ack;
*rpp = NULL;
if (nd->nd_nam2 == NULL) {
nd->nd_flag |= ND_STREAMSOCK;
isdgram = 0;
} else {
isdgram = 1;
}
/*
* Two cases:
* 1 - For NFSv2 over UDP, if we are near our malloc/mget
* limit, just drop the request. There is no
* NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
* client will timeout/retry over UDP in a little while.
* 2 - nd_repstat == 0 && nd_mreq == NULL, which
* means a normal nfs rpc, so check the cache
*/
if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
nfsrv_mallocmget_limit()) {
cacherep = RC_DROPIT;
} else {
/*
* For NFSv3, play it safe and assume that the client is
* doing retries on the same TCP connection.
*/
if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
ND_STREAMSOCK)
nd->nd_flag |= ND_SAMETCPCONN;
nd->nd_retxid = xid;
nd->nd_tcpconntime = NFSD_MONOSEC;
nd->nd_sockref = xprt->xp_sockref;
cacherep = nfsrvd_getcache(nd);
ack = 0;
SVC_ACK(xprt, &ack);
nfsrc_trimcache(xprt->xp_sockref, ack, 0);
}
/*
* Handle the request. There are three cases.
* RC_DOIT - do the RPC
* RC_REPLY - return the reply already created
* RC_DROPIT - just throw the request away
*/
if (cacherep == RC_DOIT) {
nfsrvd_dorpc(nd, isdgram, td);
if (nd->nd_repstat == NFSERR_DONTREPLY)
cacherep = RC_DROPIT;
else
cacherep = RC_REPLY;
*rpp = nfsrvd_updatecache(nd);
}
NFSEXITCODE2(0, nd);
return (cacherep);
}
