2 * Copyright (c) 2000, 2001 Boris Popov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/sys/kern/subr_mchain.c,v 1.2.2.2 2002/04/13 12:46:40 bp Exp $
33 * $DragonFly: src/sys/kern/libmchain/subr_mchain.c,v 1.6 2007/10/20 09:38:01 sephe Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/errno.h>
41 #include <sys/malloc.h>
43 #include <sys/module.h>
46 #include <sys/mchain.h>
48 MODULE_VERSION(libmchain, 1);
50 #define MBERROR(format, args...) kprintf("%s(%d): "format, __func__ , \
53 #define MBPANIC(format, args...) kprintf("%s(%d): "format, __func__ , \
57 * Various helper functions
60 m_fixhdr(struct mbuf *m0)
69 m0->m_pkthdr.len = len;
74 mb_init(struct mbchain *mbp)
78 m = m_gethdr(MB_WAIT, MT_DATA);
81 m->m_pkthdr.rcvif = NULL;
88 mb_initm(struct mbchain *mbp, struct mbuf *m)
90 bzero(mbp, sizeof(*mbp));
91 mbp->mb_top = mbp->mb_cur = m;
92 mbp->mb_mleft = M_TRAILINGSPACE(m);
96 mb_done(struct mbchain *mbp)
105 mb_detach(struct mbchain *mbp)
115 mb_fixhdr(struct mbchain *mbp)
117 return mbp->mb_top->m_pkthdr.len = m_fixhdr(mbp->mb_top);
121 * Check if object of size 'size' fit to the current position and
122 * allocate new mbuf if not. Advance pointers and increase length of mbuf(s).
123 * Return pointer to the object placeholder or NULL if any error occured.
124 * Note: size should be <= MLEN
127 mb_reserve(struct mbchain *mbp, int size)
133 panic("mb_reserve: size = %d\n", size);
135 if (mbp->mb_mleft < size) {
136 mn = m_get(MB_WAIT, MT_DATA);
139 mbp->mb_cur = m->m_next = mn;
142 mbp->mb_mleft = M_TRAILINGSPACE(m);
144 mbp->mb_mleft -= size;
145 mbp->mb_count += size;
146 bpos = mtod(m, caddr_t) + m->m_len;
152 mb_put_uint8(struct mbchain *mbp, u_int8_t x)
154 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
158 mb_put_uint16be(struct mbchain *mbp, u_int16_t x)
161 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
165 mb_put_uint16le(struct mbchain *mbp, u_int16_t x)
168 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
172 mb_put_uint32be(struct mbchain *mbp, u_int32_t x)
175 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
179 mb_put_uint32le(struct mbchain *mbp, u_int32_t x)
182 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
186 mb_put_int64be(struct mbchain *mbp, int64_t x)
189 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
193 mb_put_int64le(struct mbchain *mbp, int64_t x)
196 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
200 mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type)
205 int error, mleft, count;
209 mleft = mbp->mb_mleft;
213 if (m->m_next == NULL) {
214 m->m_next = m_getc(size, MB_WAIT, MT_DATA);
219 mleft = M_TRAILINGSPACE(m);
222 cplen = mleft > size ? size : mleft;
223 dst = mtod(m, caddr_t) + m->m_len;
226 error = mbp->mb_copy(mbp, source, dst, cplen);
231 for (src = source, count = cplen; count; count--)
235 bcopy(source, dst, cplen);
238 error = copyin(source, dst, cplen);
250 mbp->mb_count += cplen;
253 mbp->mb_mleft = mleft;
258 mb_put_mbuf(struct mbchain *mbp, struct mbuf *m)
260 mbp->mb_cur->m_next = m;
262 mbp->mb_count += m->m_len;
263 if (m->m_next == NULL)
267 mbp->mb_mleft = M_TRAILINGSPACE(m);
273 * copies a uio scatter/gather list to an mbuf chain.
276 mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size)
281 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
283 while (size > 0 && uiop->uio_resid) {
284 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
286 left = uiop->uio_iov->iov_len;
294 error = mb_put_mem(mbp, uiop->uio_iov->iov_base, left, mtype);
297 uiop->uio_offset += left;
298 uiop->uio_resid -= left;
299 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left;
300 uiop->uio_iov->iov_len -= left;
307 * Routines for fetching data from an mbuf chain
310 md_init(struct mdchain *mdp)
314 m = m_gethdr(MB_WAIT, MT_DATA);
317 m->m_pkthdr.rcvif = NULL;
324 md_initm(struct mdchain *mdp, struct mbuf *m)
326 bzero(mdp, sizeof(*mdp));
327 mdp->md_top = mdp->md_cur = m;
328 mdp->md_pos = mtod(m, u_char*);
332 md_done(struct mdchain *mdp)
335 m_freem(mdp->md_top);
341 * Append a separate mbuf chain. It is caller responsibility to prevent
342 * multiple calls to fetch/record routines.
345 md_append_record(struct mdchain *mdp, struct mbuf *top)
349 if (mdp->md_top == NULL) {
357 top->m_nextpkt = NULL;
362 * Put next record in place of existing
365 md_next_record(struct mdchain *mdp)
369 if (mdp->md_top == NULL)
371 m = mdp->md_top->m_nextpkt;
380 md_get_uint8(struct mdchain *mdp, u_int8_t *x)
382 return md_get_mem(mdp, x, 1, MB_MINLINE);
386 md_get_uint16(struct mdchain *mdp, u_int16_t *x)
388 return md_get_mem(mdp, (caddr_t)x, 2, MB_MINLINE);
392 md_get_uint16le(struct mdchain *mdp, u_int16_t *x)
395 int error = md_get_uint16(mdp, &v);
402 md_get_uint16be(struct mdchain *mdp, u_int16_t *x) {
404 int error = md_get_uint16(mdp, &v);
411 md_get_uint32(struct mdchain *mdp, u_int32_t *x)
413 return md_get_mem(mdp, (caddr_t)x, 4, MB_MINLINE);
417 md_get_uint32be(struct mdchain *mdp, u_int32_t *x)
422 error = md_get_uint32(mdp, &v);
428 md_get_uint32le(struct mdchain *mdp, u_int32_t *x)
433 error = md_get_uint32(mdp, &v);
439 md_get_int64(struct mdchain *mdp, int64_t *x)
441 return md_get_mem(mdp, (caddr_t)x, 8, MB_MINLINE);
445 md_get_int64be(struct mdchain *mdp, int64_t *x)
450 error = md_get_int64(mdp, &v);
456 md_get_int64le(struct mdchain *mdp, int64_t *x)
461 error = md_get_int64(mdp, &v);
467 md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type)
469 struct mbuf *m = mdp->md_cur;
476 MBERROR("incomplete copy\n");
480 count = mtod(m, u_char*) + m->m_len - s;
482 mdp->md_cur = m = m->m_next;
484 s = mdp->md_pos = mtod(m, caddr_t);
490 mdp->md_pos += count;
495 error = copyout(s, target, count);
500 bcopy(s, target, count);
513 md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **ret)
515 struct mbuf *m = mdp->md_cur, *rm;
517 rm = m_copym(m, mdp->md_pos - mtod(m, u_char*), size, MB_WAIT);
520 md_get_mem(mdp, NULL, size, MB_MZERO);
526 md_get_uio(struct mdchain *mdp, struct uio *uiop, int size)
532 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
533 while (size > 0 && uiop->uio_resid) {
534 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
536 left = uiop->uio_iov->iov_len;
542 uiocp = uiop->uio_iov->iov_base;
545 error = md_get_mem(mdp, uiocp, left, mtype);
548 uiop->uio_offset += left;
549 uiop->uio_resid -= left;
550 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left;
551 uiop->uio_iov->iov_len -= left;