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2a0c503e7a
freebsd/sys/netncp/ncp_rq.c
Bosko Milekic 2a0c503e7a * Rename M_WAIT mbuf subsystem flag to M_TRYWAIT. 
This is because calls with M_WAIT (now M_TRYWAIT) may not wait
  forever when nothing is available for allocation, and may end up
  returning NULL. Hopefully we now communicate more of the right thing
  to developers and make it very clear that it's necessary to check whether
  calls with M_(TRY)WAIT also resulted in a failed allocation.
  M_TRYWAIT basically means "try harder, block if necessary, but don't
  necessarily wait forever." The time spent blocking is tunable with
  the kern.ipc.mbuf_wait sysctl.
  M_WAIT is now deprecated but still defined for the next little while.

* Fix a typo in a comment in mbuf.h

* Fix some code that was actually passing the mbuf subsystem's M_WAIT to
  malloc(). Made it pass M_WAITOK instead. If we were ever to redefine the
  value of the M_WAIT flag, this could have became a big problem.
2000-12-21 21:44:31 +00:00

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/*
* Copyright (c) 1999, Boris Popov
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* Routines to prepare request and fetch reply
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/mbuf.h>
#include <sys/uio.h>
#include <netncp/ncp.h>
#include <netncp/ncp_conn.h>
#include <netncp/ncp_rq.h>
#include <netncp/ncp_subr.h>
#include <netncp/ncp_ncp.h>
#include <netncp/ncp_nls.h>
static struct mbuf* m_getm(struct mbuf *top, int len);
int
ncp_rq_head(struct ncp_rq *rqp, u_int32_t ptype, u_int8_t fn,struct proc *p,
struct ucred *cred)
{
struct mbuf *m;
struct ncp_rqhdr *rq;
struct ncp_bursthdr *brq;
caddr_t pstart;
bzero(rqp, sizeof(*rqp));
rqp->p = p;
rqp->cred = cred;
m = m_gethdr(M_TRYWAIT, MT_DATA);
if (m == NULL)
return ENOBUFS; /* if M_TRYWAIT ? */
m->m_pkthdr.rcvif = NULL;
rqp->rq = rqp->mrq = m;
rqp->rp = NULL;
switch(ptype) {
case NCP_PACKET_BURST:
MH_ALIGN(m, sizeof(*brq) + 24);
m->m_len = sizeof(*brq);
brq = mtod(m, struct ncp_bursthdr *);
brq->bh_type = ptype;
brq->bh_streamtype = 0x2;
pstart = (caddr_t)brq;
break;
default:
MH_ALIGN(m, sizeof(*rq) + 2); /* possible len field in some functions */
m->m_len = sizeof(*rq);
rq = mtod(m, struct ncp_rqhdr *);
rq->type = ptype;
rq->seq = 0; /* filled later */
rq->fn = fn;
pstart = (caddr_t)rq;
break;
}
rqp->bpos = pstart + m->m_len;
return 0;
}
int
ncp_rq_done(struct ncp_rq *rqp) {
m_freem(rqp->rq);
rqp->rq=NULL;
if (rqp->rp) m_freem(rqp->rp);
rqp->rp=NULL;
return (0);
}
static struct mbuf*
m_getm(struct mbuf *top, int len) {
int rest = len, mlen;
struct mbuf *m=0,*mp;
mp = top;
while (rest > 0) {
/* NCPSDEBUG("%d\n",rest);*/
m = m_get(M_TRYWAIT, MT_DATA);
if (rest > MINCLSIZE) {
MCLGET(m,M_TRYWAIT);
mlen = ( (m->m_flags & M_EXT) == 0) ? MLEN : MCLBYTES;
} else {
mlen = MLEN;
}
m->m_len = 0/*min(mlen,rest)*/;
mp->m_next = m;
mp = m;
rest -= mlen;
}
return top;
}
/*
* Routines to fill the request
*/
static caddr_t ncp_mchecksize(struct ncp_rq *rqp, int size);
#define NCP_RQADD(t) ((t*)(ncp_mchecksize(rqp,sizeof(t))))
caddr_t
ncp_mchecksize(struct ncp_rq *rqp, int size) {
caddr_t bpos1;
if (size>MLEN)
panic("ncp_mchecksize\n");
if (M_TRAILINGSPACE(rqp->mrq)<(size)) {
struct mbuf *m;
m = m_get(M_TRYWAIT, MT_DATA);
m->m_len = 0;
rqp->bpos = mtod(m, caddr_t);
rqp->mrq->m_next = m;
rqp->mrq = m;
}
rqp->mrq->m_len += size;
bpos1 = rqp->bpos;
rqp->bpos += size;
return bpos1;
}
void
ncp_rq_byte(struct ncp_rq *rqp,u_int8_t x) {
*NCP_RQADD(u_int8_t)=x;
}
void
ncp_rq_word_hl(struct ncp_rq *rqp, u_int16_t x) {
setwbe(NCP_RQADD(u_int16_t), 0, x);
}
void
ncp_rq_word_lh(struct ncp_rq *rqp, u_int16_t x) {
setwle(NCP_RQADD(u_int16_t), 0, x);
}
void
ncp_rq_dword_lh(struct ncp_rq *rqp, u_int32_t x) {
setdle(NCP_RQADD(u_int32_t), 0, x);
}
void
ncp_rq_pathstring(struct ncp_rq *rqp, int size, char *name, struct ncp_nlstables *nt) {
struct mbuf *m;
int cplen;
ncp_rq_byte(rqp, size);
m = rqp->mrq;
cplen = min(size, M_TRAILINGSPACE(m));
if (cplen) {
ncp_pathcopy(name, rqp->bpos, cplen, nt);
size -= cplen;
name += cplen;
m->m_len += cplen;
}
if (size) {
m_getm(m, size);
while (size > 0){
m = m->m_next;
cplen = min(size, M_TRAILINGSPACE(m));
ncp_pathcopy(name, mtod(m, caddr_t) + m->m_len, cplen, nt);
size -= cplen;
name += cplen;
m->m_len += cplen;
}
}
rqp->bpos = mtod(m,caddr_t) + m->m_len;
rqp->mrq = m;
return;
}
int
ncp_rq_putanymem(struct ncp_rq *rqp, caddr_t source, int size, int type) {
struct mbuf *m;
int cplen, error;
m = rqp->mrq;
cplen = min(size, M_TRAILINGSPACE(m));
if (cplen) {
if (type==1) {
error = copyin(source, rqp->bpos, cplen);
if (error) return error;
} else
bcopy(source, rqp->bpos, cplen);
size -= cplen;
source += cplen;
m->m_len += cplen;
}
if (size) {
m_getm(m, size);
while (size > 0){
m = m->m_next;
cplen = min(size, M_TRAILINGSPACE(m));
if (type==1) {
error = copyin(source, mtod(m, caddr_t) + m->m_len, cplen);
if (error) return error;
} else
bcopy(source, mtod(m, caddr_t) + m->m_len, cplen);
size -= cplen;
source += cplen;
m->m_len += cplen;
}
}
rqp->bpos = mtod(m,caddr_t) + m->m_len;
rqp->mrq = m;
return 0;
}
int
ncp_rq_mbuf(struct ncp_rq *rqp, struct mbuf *m, int size) {
rqp->mrq->m_next = m;
m->m_next = NULL;
if (size != M_COPYALL) m->m_len = size;
rqp->bpos = mtod(m,caddr_t) + m->m_len;
rqp->mrq = m;
return 0;
}
void
ncp_rq_pstring(struct ncp_rq *rqp, char *s) {
int len = strlen(s);
if (len > 255) {
nwfs_printf("string too long: %s\n", s);
len = 255;
}
ncp_rq_byte(rqp, len);
ncp_rq_mem(rqp, s, len);
return;
}
void
ncp_rq_dbase_path(struct ncp_rq *rqp, u_int8_t vol_num, u_int32_t dir_base,
int namelen, u_char *path, struct ncp_nlstables *nt)
{
int complen;
ncp_rq_byte(rqp, vol_num);
ncp_rq_dword(rqp, dir_base);
ncp_rq_byte(rqp, 1); /* with dirbase */
if (path != NULL && path[0]) {
if (namelen < 0) {
namelen = *path++;
ncp_rq_byte(rqp, namelen);
for(; namelen; namelen--) {
complen = *path++;
ncp_rq_byte(rqp, complen);
ncp_rq_mem(rqp, path, complen);
path += complen;
}
} else {
ncp_rq_byte(rqp, 1); /* 1 component */
ncp_rq_pathstring(rqp, namelen, path, nt);
}
} else {
ncp_rq_byte(rqp, 0);
ncp_rq_byte(rqp, 0);
}
}
/*
* fetch reply routines
*/
#define ncp_mspaceleft (mtod(rqp->mrp,caddr_t)+rqp->mrp->m_len-rqp->bpos)
u_int8_t
ncp_rp_byte(struct ncp_rq *rqp) {
if (rqp->mrp == NULL) return 0;
if (ncp_mspaceleft < 1) {
rqp->mrp = rqp->mrp->m_next;
if (rqp->mrp == NULL) return 0;
rqp->bpos = mtod(rqp->mrp, caddr_t);
}
rqp->bpos += 1;
return rqp->bpos[-1];
}
u_int16_t
ncp_rp_word_lh(struct ncp_rq *rqp) {
caddr_t prev = rqp->bpos;
u_int16_t t;
if (rqp->mrp == NULL) return 0;
if (ncp_mspaceleft >= 2) {
rqp->bpos += 2;
return getwle(prev,0);
}
t = *((u_int8_t*)(rqp->bpos));
rqp->mrp = rqp->mrp->m_next;
if (rqp->mrp == NULL) return 0;
((u_int8_t *)&t)[1] = *((u_int8_t*)(rqp->bpos = mtod(rqp->mrp, caddr_t)));
rqp->bpos += 2;
return t;
}
u_int16_t
ncp_rp_word_hl(struct ncp_rq *rqp) {
return (ntohs(ncp_rp_word_lh(rqp)));
}
u_int32_t
ncp_rp_dword_hl(struct ncp_rq *rqp) {
int togo, rest;
caddr_t prev = rqp->bpos;
u_int32_t t;
if (rqp->mrp == NULL) return 0;
rest = ncp_mspaceleft;
if (rest >= 4) {
rqp->bpos += 4;
return getdbe(prev,0);
}
togo = 0;
while (rest--) {
((u_int8_t *)&t)[togo++] = *((u_int8_t*)(prev++));
}
rqp->mrp = rqp->mrp->m_next;
if (rqp->mrp == NULL) return 0;
prev = mtod(rqp->mrp, caddr_t);
rqp->bpos = prev + 4 - togo; /* XXX possible low than togo bytes in next mbuf */
while (togo < 4) {
((u_int8_t *)&t)[togo++] = *((u_int8_t*)(prev++));
}
return getdbe(&t,0);
}
u_int32_t
ncp_rp_dword_lh(struct ncp_rq *rqp) {
int rest, togo;
caddr_t prev = rqp->bpos;
u_int32_t t;
if (rqp->mrp == NULL) return 0;
rest = ncp_mspaceleft;
if (rest >= 4) {
rqp->bpos += 4;
return getdle(prev,0);
}
togo = 0;
while (rest--) {
((u_int8_t *)&t)[togo++] = *((u_int8_t*)(prev++));
}
rqp->mrp = rqp->mrp->m_next;
if (rqp->mrp == NULL) return 0;
prev = mtod(rqp->mrp, caddr_t);
rqp->bpos = prev + 4 - togo; /* XXX possible low than togo bytes in next mbuf */
while (togo < 4) {
((u_int8_t *)&t)[togo++] = *((u_int8_t*)(prev++));
}
return getdle(&t,0);
}
void
ncp_rp_mem(struct ncp_rq *rqp,caddr_t target, int size) {
register struct mbuf *m=rqp->mrp;
register unsigned count;
while (size > 0) {
if (m==0) { /* should be panic */
printf("ncp_rp_mem: incomplete copy\n");
return;
}
count = mtod(m,caddr_t)+m->m_len-rqp->bpos;
if (count == 0) {
m=m->m_next;
rqp->bpos=mtod(m,caddr_t);
continue;
}
count = min(count,size);
bcopy(rqp->bpos, target, count);
size -= count;
target += count;
rqp->bpos += count;
}
rqp->mrp=m;
return;
}
int
ncp_rp_usermem(struct ncp_rq *rqp,caddr_t target, int size) {
register struct mbuf *m=rqp->mrp;
register unsigned count;
int error;
while (size>0) {
if (m==0) { /* should be panic */
printf("ncp_rp_mem: incomplete copy\n");
return EFAULT;
}
count = mtod(m,caddr_t)+m->m_len-rqp->bpos;
if (count == 0) {
m=m->m_next;
rqp->bpos=mtod(m,caddr_t);
continue;
}
count = min(count,size);
error=copyout(rqp->bpos, target, count);
if (error) return error;
size -= count;
target += count;
rqp->bpos += count;
}
rqp->mrp=m;
return 0;
}
struct mbuf*
ncp_rp_mbuf(struct ncp_rq *rqp, int size) {
register struct mbuf *m=rqp->mrp, *rm;
register unsigned count;
rm = m_copym(m, rqp->bpos - mtod(m,caddr_t), size, M_TRYWAIT);
while (size > 0) {
if (m == 0) {
printf("ncp_rp_mbuf: can't advance\n");
return rm;
}
count = mtod(m,caddr_t)+ m->m_len - rqp->bpos;
if (count == 0) {
m = m->m_next;
rqp->bpos = mtod(m, caddr_t);
continue;
}
count = min(count, size);
size -= count;
rqp->bpos += count;
}
rqp->mrp=m;
return rm;
}
int
nwfs_mbuftouio(mrep, uiop, siz, dpos)
struct mbuf **mrep;
register struct uio *uiop;
int siz;
caddr_t *dpos;
{
register char *mbufcp, *uiocp;
register int xfer, left, len;
register struct mbuf *mp;
long uiosiz;
int error = 0;
mp = *mrep;
if (!mp) return 0;
mbufcp = *dpos;
len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
while (siz > 0) {
if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
return (EFBIG);
left = uiop->uio_iov->iov_len;
uiocp = uiop->uio_iov->iov_base;
if (left > siz)
left = siz;
uiosiz = left;
while (left > 0) {
while (len == 0) {
mp = mp->m_next;
if (mp == NULL)
return (EBADRPC);
mbufcp = mtod(mp, caddr_t);
len = mp->m_len;
}
xfer = (left > len) ? len : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(mbufcp, uiocp, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(mbufcp, uiocp, xfer);
else
copyout(mbufcp, uiocp, xfer);
left -= xfer;
len -= xfer;
mbufcp += xfer;
uiocp += xfer;
uiop->uio_offset += xfer;
uiop->uio_resid -= xfer;
}
if (uiop->uio_iov->iov_len <= siz) {
uiop->uio_iovcnt--;
uiop->uio_iov++;
} else {
uiop->uio_iov->iov_base += uiosiz;
uiop->uio_iov->iov_len -= uiosiz;
}
siz -= uiosiz;
}
*dpos = mbufcp;
*mrep = mp;
return (error);
}
/*
* copies a uio scatter/gather list to an mbuf chain.
* NOTE: can ony handle iovcnt == 1
*/
int
nwfs_uiotombuf(uiop, mq, siz, bpos)
register struct uio *uiop;
struct mbuf **mq;
int siz;
caddr_t *bpos;
{
register char *uiocp;
register struct mbuf *mp, *mp2;
register int xfer, left, mlen;
int uiosiz, clflg;
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfsm_uiotombuf: iovcnt != 1");
#endif
if (siz > MLEN) /* or should it >= MCLBYTES ?? */
clflg = 1;
else
clflg = 0;
mp = mp2 = *mq;
while (siz > 0) {
left = uiop->uio_iov->iov_len;
uiocp = uiop->uio_iov->iov_base;
if (left > siz)
left = siz;
uiosiz = left;
while (left > 0) {
mlen = M_TRAILINGSPACE(mp);
if (mlen == 0) {
MGET(mp, M_TRYWAIT, MT_DATA);
if (clflg)
MCLGET(mp, M_TRYWAIT);
mp->m_len = 0;
mp2->m_next = mp;
mp2 = mp;
mlen = M_TRAILINGSPACE(mp);
}
xfer = (left > mlen) ? mlen : left;
#ifdef notdef
/* Not Yet.. */
if (uiop->uio_iov->iov_op != NULL)
(*(uiop->uio_iov->iov_op))
(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
#endif
if (uiop->uio_segflg == UIO_SYSSPACE)
bcopy(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
else
copyin(uiocp, mtod(mp, caddr_t)+mp->m_len, xfer);
mp->m_len += xfer;
left -= xfer;
uiocp += xfer;
uiop->uio_offset += xfer;
uiop->uio_resid -= xfer;
}
uiop->uio_iov->iov_base += uiosiz;
uiop->uio_iov->iov_len -= uiosiz;
siz -= uiosiz;
}
*bpos = mtod(mp, caddr_t)+mp->m_len;
*mq = mp;
return (0);
}
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