subr_mchain.c

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    1 /*      $NetBSD: subr_mchain.c,v 1.15.6.1 2010/07/16 18:47:10 riz Exp $ */
    2 
    3 /*
    4  * Copyright (c) 2000, 2001 Boris Popov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *    This product includes software developed by Boris Popov.
   18  * 4. Neither the name of the author nor the names of any co-contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * FreeBSD: src/sys/kern/subr_mchain.c,v 1.4 2002/02/21 16:23:38 bp Exp
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: subr_mchain.c,v 1.15.6.1 2010/07/16 18:47:10 riz Exp $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/errno.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/uio.h>
   45 
   46 #include <uvm/uvm_extern.h>
   47 
   48 #include <netsmb/mchain.h>
   49 
   50 #define MBERROR(x)      aprint_error x
   51 #define MBPANIC(x)      aprint_error x
   52 
   53 #ifdef __NetBSD__
   54 static struct mbuf *
   55 m_getm(struct mbuf *m, size_t len, int how, int type)
   56 {
   57         struct mbuf *top, *tail, *mp, *mtail = NULL;
   58 
   59         mp = m_get(how, type);
   60         if (mp == NULL)
   61                 return (NULL);
   62         else if (len > MINCLSIZE) {
   63                 m_clget(mp, how);
   64                 if ((mp->m_flags & M_EXT) == 0) {
   65                         m_free(mp);
   66                         return (NULL);
   67                 }
   68         }
   69         mp->m_len = 0;
   70         len -= M_TRAILINGSPACE(mp);
   71 
   72         if (m != NULL)
   73                 for (mtail = m; mtail->m_next != NULL; mtail = mtail->m_next);
   74         else
   75                 m = mp;
   76 
   77         top = tail = mp;
   78         while (len > 0) {
   79                 mp = m_get(how, type);
   80                 if (mp == NULL)
   81                         goto failed;
   82 
   83                 tail->m_next = mp;
   84                 tail = mp;
   85                 if (len > MINCLSIZE) {
   86                         m_clget(mp, how);
   87                         if ((mp->m_flags & M_EXT) == 0)
   88                                 goto failed;
   89                 }
   90 
   91                 mp->m_len = 0;
   92                 len -= M_TRAILINGSPACE(mp);
   93         }
   94 
   95         if (mtail != NULL)
   96                 mtail->m_next = top;
   97         return (m);
   98 
   99 failed:
  100         m_freem(top);
  101         return (NULL);
  102 }
  103 
  104 #endif /* __NetBSD__ */
  105 
  106 /*
  107  * Various helper functions
  108  */
  109 int
  110 m_fixhdr(struct mbuf *m0)
  111 {
  112         struct mbuf *m = m0;
  113         size_t len = 0;
  114 
  115         while (m) {
  116                 len += m->m_len;
  117                 m = m->m_next;
  118         }
  119         m0->m_pkthdr.len = len;
  120         return len;
  121 }
  122 
  123 int
  124 mb_init(struct mbchain *mbp)
  125 {
  126         struct mbuf *m;
  127 
  128         m = m_gethdr(M_WAIT, MT_DATA);
  129         if (m == NULL)
  130                 return ENOBUFS;
  131         m->m_len = 0;
  132         mb_initm(mbp, m);
  133         return 0;
  134 }
  135 
  136 void
  137 mb_initm(struct mbchain *mbp, struct mbuf *m)
  138 {
  139         bzero(mbp, sizeof(*mbp));
  140         mbp->mb_top = mbp->mb_cur = m;
  141         mbp->mb_mleft = M_TRAILINGSPACE(m);
  142 }
  143 
  144 void
  145 mb_done(struct mbchain *mbp)
  146 {
  147         if (mbp->mb_top) {
  148                 m_freem(mbp->mb_top);
  149                 mbp->mb_top = NULL;
  150         }
  151 }
  152 
  153 struct mbuf *
  154 mb_detach(struct mbchain *mbp)
  155 {
  156         struct mbuf *m;
  157 
  158         m = mbp->mb_top;
  159         mbp->mb_top = NULL;
  160         return m;
  161 }
  162 
  163 int
  164 mb_fixhdr(struct mbchain *mbp)
  165 {
  166         return mbp->mb_top->m_pkthdr.len = m_fixhdr(mbp->mb_top);
  167 }
  168 
  169 /*
  170  * Check if object of size 'size' fit to the current position and
  171  * allocate new mbuf if not. Advance pointers and increase length of mbuf(s).
  172  * Return pointer to the object placeholder or NULL if any error occurred.
  173  * Note: size should be <= MLEN
  174  */
  175 void *
  176 mb_reserve(struct mbchain *mbp, size_t size)
  177 {
  178         struct mbuf *m, *mn;
  179         void *bpos;
  180 
  181         if (size > MLEN)
  182                 panic("mb_reserve: size = %zu", size);
  183         m = mbp->mb_cur;
  184         if (mbp->mb_mleft < size) {
  185                 mn = m_get(M_WAIT, MT_DATA);
  186                 if (mn == NULL)
  187                         return NULL;
  188                 mbp->mb_cur = m->m_next = mn;
  189                 m = mn;
  190                 m->m_len = 0;
  191                 mbp->mb_mleft = M_TRAILINGSPACE(m);
  192         }
  193         mbp->mb_mleft -= size;
  194         mbp->mb_count += size;
  195         bpos = mtod(m, char *) + m->m_len;
  196         m->m_len += size;
  197         return bpos;
  198 }
  199 
  200 int
  201 mb_put_uint8(struct mbchain *mbp, u_int8_t x)
  202 {
  203         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  204 }
  205 
  206 int
  207 mb_put_uint16be(struct mbchain *mbp, u_int16_t x)
  208 {
  209         x = htobe16(x);
  210         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  211 }
  212 
  213 int
  214 mb_put_uint16le(struct mbchain *mbp, u_int16_t x)
  215 {
  216         x = htole16(x);
  217         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  218 }
  219 
  220 int
  221 mb_put_uint32be(struct mbchain *mbp, u_int32_t x)
  222 {
  223         x = htobe32(x);
  224         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  225 }
  226 
  227 int
  228 mb_put_uint32le(struct mbchain *mbp, u_int32_t x)
  229 {
  230         x = htole32(x);
  231         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  232 }
  233 
  234 int
  235 mb_put_int64be(struct mbchain *mbp, int64_t x)
  236 {
  237         x = htobe64(x);
  238         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  239 }
  240 
  241 int
  242 mb_put_int64le(struct mbchain *mbp, int64_t x)
  243 {
  244         x = htole64(x);
  245         return mb_put_mem(mbp, (void *)&x, sizeof(x), MB_MSYSTEM);
  246 }
  247 
  248 int
  249 mb_put_mem(struct mbchain *mbp, const char *source, size_t size, int type)
  250 {
  251         struct mbuf *m;
  252         char *dst;
  253         const char *src;
  254         int error;
  255         size_t cplen, mleft, count;
  256 
  257         m = mbp->mb_cur;
  258         mleft = mbp->mb_mleft;
  259 
  260         while (size > 0) {
  261                 if (mleft == 0) {
  262                         if (m->m_next == NULL) {
  263                                 m = m_getm(m, size, M_WAIT, MT_DATA);
  264                                 if (m == NULL)
  265                                         return ENOBUFS;
  266                         }
  267                         m = m->m_next;
  268                         mleft = M_TRAILINGSPACE(m);
  269                         continue;
  270                 }
  271                 cplen = mleft > size ? size : mleft;
  272                 dst = mtod(m, char *) + m->m_len;
  273                 switch (type) {
  274                     case MB_MCUSTOM:
  275                         error = mbp->mb_copy(mbp, source, dst, cplen);
  276                         if (error)
  277                                 return error;
  278                         break;
  279                     case MB_MINLINE:
  280                         for (src = source, count = cplen; count; count--)
  281                                 *dst++ = *src++;
  282                         break;
  283                     case MB_MSYSTEM:
  284                         bcopy(source, dst, cplen);
  285                         break;
  286                     case MB_MUSER:
  287                         error = copyin(source, dst, cplen);
  288                         if (error)
  289                                 return error;
  290                         break;
  291                     case MB_MZERO:
  292                         bzero(dst, cplen);
  293                         break;
  294                 }
  295                 size -= cplen;
  296                 source += cplen;
  297                 m->m_len += cplen;
  298                 mleft -= cplen;
  299                 mbp->mb_count += cplen;
  300         }
  301         mbp->mb_cur = m;
  302         mbp->mb_mleft = mleft;
  303         return 0;
  304 }
  305 
  306 int
  307 mb_put_mbuf(struct mbchain *mbp, struct mbuf *m)
  308 {
  309         mbp->mb_cur->m_next = m;
  310         while (m) {
  311                 mbp->mb_count += m->m_len;
  312                 if (m->m_next == NULL)
  313                         break;
  314                 m = m->m_next;
  315         }
  316         mbp->mb_mleft = M_TRAILINGSPACE(m);
  317         mbp->mb_cur = m;
  318         return 0;
  319 }
  320 
  321 /*
  322  * copies a uio scatter/gather list to an mbuf chain.
  323  */
  324 int
  325 mb_put_uio(struct mbchain *mbp, struct uio *uiop, size_t size)
  326 {
  327         size_t left;
  328         int mtype, error;
  329 
  330         mtype = VMSPACE_IS_KERNEL_P(uiop->uio_vmspace) ? MB_MSYSTEM : MB_MUSER;
  331 
  332         while (size > 0 && uiop->uio_resid) {
  333                 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
  334                         return EFBIG;
  335                 left = uiop->uio_iov->iov_len;
  336                 if (left == 0) {
  337                         uiop->uio_iov++;
  338                         uiop->uio_iovcnt--;
  339                         continue;
  340                 }
  341                 if (left > size)
  342                         left = size;
  343                 error = mb_put_mem(mbp, uiop->uio_iov->iov_base, left, mtype);
  344                 if (error)
  345                         return error;
  346                 uiop->uio_offset += left;
  347                 uiop->uio_resid -= left;
  348                 uiop->uio_iov->iov_base =
  349                         (char *)uiop->uio_iov->iov_base + left;
  350                 uiop->uio_iov->iov_len -= left;
  351                 size -= left;
  352         }
  353         return 0;
  354 }
  355 
  356 /*
  357  * Routines for fetching data from an mbuf chain
  358  */
  359 int
  360 md_init(struct mdchain *mdp)
  361 {
  362         struct mbuf *m;
  363 
  364         m = m_gethdr(M_WAIT, MT_DATA);
  365         if (m == NULL)
  366                 return ENOBUFS;
  367         m->m_len = 0;
  368         md_initm(mdp, m);
  369         return 0;
  370 }
  371 
  372 void
  373 md_initm(struct mdchain *mdp, struct mbuf *m)
  374 {
  375         bzero(mdp, sizeof(*mdp));
  376         mdp->md_top = mdp->md_cur = m;
  377         mdp->md_pos = mtod(m, u_char*);
  378 }
  379 
  380 void
  381 md_done(struct mdchain *mdp)
  382 {
  383         if (mdp->md_top) {
  384                 m_freem(mdp->md_top);
  385                 mdp->md_top = NULL;
  386         }
  387 }
  388 
  389 /*
  390  * Append a separate mbuf chain. It is caller responsibility to prevent
  391  * multiple calls to fetch/record routines.
  392  */
  393 void
  394 md_append_record(struct mdchain *mdp, struct mbuf *top)
  395 {
  396         struct mbuf *m;
  397 
  398         if (mdp->md_top == NULL) {
  399                 md_initm(mdp, top);
  400                 return;
  401         }
  402         m = mdp->md_top;
  403         while (m->m_nextpkt)
  404                 m = m->m_nextpkt;
  405         m->m_nextpkt = top;
  406         top->m_nextpkt = NULL;
  407         return;
  408 }
  409 
  410 /*
  411  * Put next record in place of existing
  412  */
  413 int
  414 md_next_record(struct mdchain *mdp)
  415 {
  416         struct mbuf *m;
  417 
  418         if (mdp->md_top == NULL)
  419                 return ENOENT;
  420         m = mdp->md_top->m_nextpkt;
  421         md_done(mdp);
  422         if (m == NULL)
  423                 return ENOENT;
  424         md_initm(mdp, m);
  425         return 0;
  426 }
  427 
  428 int
  429 md_get_uint8(struct mdchain *mdp, u_int8_t *x)
  430 {
  431         return md_get_mem(mdp, x, 1, MB_MINLINE);
  432 }
  433 
  434 int
  435 md_get_uint16(struct mdchain *mdp, u_int16_t *x)
  436 {
  437         return md_get_mem(mdp, (void *)x, 2, MB_MINLINE);
  438 }
  439 
  440 int
  441 md_get_uint16le(struct mdchain *mdp, u_int16_t *x)
  442 {
  443         u_int16_t v;
  444         int error = md_get_uint16(mdp, &v);
  445 
  446         *x = le16toh(v);
  447         return error;
  448 }
  449 
  450 int
  451 md_get_uint16be(struct mdchain *mdp, u_int16_t *x) {
  452         u_int16_t v;
  453         int error = md_get_uint16(mdp, &v);
  454 
  455         *x = be16toh(v);
  456         return error;
  457 }
  458 
  459 int
  460 md_get_uint32(struct mdchain *mdp, u_int32_t *x)
  461 {
  462         return md_get_mem(mdp, (void *)x, 4, MB_MINLINE);
  463 }
  464 
  465 int
  466 md_get_uint32be(struct mdchain *mdp, u_int32_t *x)
  467 {
  468         u_int32_t v;
  469         int error;
  470 
  471         error = md_get_uint32(mdp, &v);
  472         *x = be32toh(v);
  473         return error;
  474 }
  475 
  476 int
  477 md_get_uint32le(struct mdchain *mdp, u_int32_t *x)
  478 {
  479         u_int32_t v;
  480         int error;
  481 
  482         error = md_get_uint32(mdp, &v);
  483         *x = le32toh(v);
  484         return error;
  485 }
  486 
  487 int
  488 md_get_int64(struct mdchain *mdp, int64_t *x)
  489 {
  490         return md_get_mem(mdp, (void *)x, 8, MB_MINLINE);
  491 }
  492 
  493 int
  494 md_get_int64be(struct mdchain *mdp, int64_t *x)
  495 {
  496         int64_t v;
  497         int error;
  498 
  499         error = md_get_int64(mdp, &v);
  500         *x = be64toh(v);
  501         return error;
  502 }
  503 
  504 int
  505 md_get_int64le(struct mdchain *mdp, int64_t *x)
  506 {
  507         int64_t v;
  508         int error;
  509 
  510         error = md_get_int64(mdp, &v);
  511         *x = le64toh(v);
  512         return error;
  513 }
  514 
  515 int
  516 md_get_mem(struct mdchain *mdp, void *targetv, size_t size, int type)
  517 {
  518         char *target = targetv;
  519         struct mbuf *m = mdp->md_cur;
  520         int error;
  521         size_t count;
  522         u_char *s;
  523 
  524         while (size > 0) {
  525                 if (m == NULL) {
  526 #ifdef MCHAIN_DEBUG
  527                         MBERROR(("incomplete copy\n"));
  528 #endif
  529                         return EBADRPC;
  530                 }
  531                 s = mdp->md_pos;
  532                 count = mtod(m, u_char*) + m->m_len - s;
  533                 if (count == 0) {
  534                         mdp->md_cur = m = m->m_next;
  535                         if (m)
  536                                 s = mdp->md_pos = mtod(m, void *);
  537                         continue;
  538                 }
  539                 if (count > size)
  540                         count = size;
  541                 size -= count;
  542                 mdp->md_pos += count;
  543                 if (target == NULL)
  544                         continue;
  545                 switch (type) {
  546                     case MB_MUSER:
  547                         error = copyout(s, target, count);
  548                         if (error)
  549                                 return error;
  550                         break;
  551                     case MB_MSYSTEM:
  552                         bcopy(s, target, count);
  553                         break;
  554                     case MB_MINLINE:
  555                         while (count--)
  556                                 *target++ = *s++;
  557                         continue;
  558                 }
  559                 target += count;
  560         }
  561         return 0;
  562 }
  563 
  564 int
  565 md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **ret)
  566 {
  567         struct mbuf *m = mdp->md_cur, *rm;
  568 
  569         rm = m_copym(m, mdp->md_pos - mtod(m, u_char*), size, M_WAIT);
  570         if (rm == NULL)
  571                 return EBADRPC;
  572         md_get_mem(mdp, NULL, size, MB_MZERO);
  573         *ret = rm;
  574         return 0;
  575 }
  576 
  577 int
  578 md_get_uio(struct mdchain *mdp, struct uio *uiop, size_t size)
  579 {
  580         char *uiocp;
  581         size_t left;
  582         int mtype, error;
  583 
  584         mtype = VMSPACE_IS_KERNEL_P(uiop->uio_vmspace) ? MB_MSYSTEM : MB_MUSER;
  585         while (size > 0 && uiop->uio_resid) {
  586                 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
  587                         return EFBIG;
  588                 left = uiop->uio_iov->iov_len;
  589                 if (left == 0) {
  590                         uiop->uio_iov++;
  591                         uiop->uio_iovcnt--;
  592                         continue;
  593                 }
  594                 uiocp = uiop->uio_iov->iov_base;
  595                 if (left > size)
  596                         left = size;
  597                 error = md_get_mem(mdp, uiocp, left, mtype);
  598                 if (error)
  599                         return error;
  600                 uiop->uio_offset += left;
  601                 uiop->uio_resid -= left;
  602                 uiop->uio_iov->iov_base =
  603                                 (char *)uiop->uio_iov->iov_base + left;
  604                 uiop->uio_iov->iov_len -= left;
  605                 size -= left;
  606         }
  607         return 0;
  608 }
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FreeBSD/Linux Kernel Cross Reference sys/netsmb/subr_mchain.c

FreeBSD/Linux Kernel Cross Reference
sys/netsmb/subr_mchain.c
