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 $
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/errno.h>
40 #include <sys/malloc.h>
42 #include <sys/module.h>
45 #include <sys/mchain.h>
47 MODULE_VERSION(libmchain, 1);
49 #define MBERROR(format, args...) printf("%s(%d): "format, __FUNCTION__ , \
52 #define MBPANIC(format, args...) printf("%s(%d): "format, __FUNCTION__ , \
56 * Various helper functions
59 m_fixhdr(struct mbuf *m0)
68 m0->m_pkthdr.len = len;
73 mb_init(struct mbchain *mbp)
77 m = m_gethdr(M_WAITOK, MT_DATA);
80 m->m_pkthdr.rcvif = NULL;
87 mb_initm(struct mbchain *mbp, struct mbuf *m)
89 bzero(mbp, sizeof(*mbp));
90 mbp->mb_top = mbp->mb_cur = m;
91 mbp->mb_mleft = M_TRAILINGSPACE(m);
95 mb_done(struct mbchain *mbp)
104 mb_detach(struct mbchain *mbp)
114 mb_fixhdr(struct mbchain *mbp)
116 return mbp->mb_top->m_pkthdr.len = m_fixhdr(mbp->mb_top);
120 * Check if object of size 'size' fit to the current position and
121 * allocate new mbuf if not. Advance pointers and increase length of mbuf(s).
122 * Return pointer to the object placeholder or NULL if any error occured.
123 * Note: size should be <= MLEN
126 mb_reserve(struct mbchain *mbp, int size)
132 panic("mb_reserve: size = %d\n", size);
134 if (mbp->mb_mleft < size) {
135 mn = m_get(M_WAITOK, MT_DATA);
138 mbp->mb_cur = m->m_next = mn;
141 mbp->mb_mleft = M_TRAILINGSPACE(m);
143 mbp->mb_mleft -= size;
144 mbp->mb_count += size;
145 bpos = mtod(m, caddr_t) + m->m_len;
151 mb_put_uint8(struct mbchain *mbp, u_int8_t x)
153 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
157 mb_put_uint16be(struct mbchain *mbp, u_int16_t x)
160 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
164 mb_put_uint16le(struct mbchain *mbp, u_int16_t x)
167 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
171 mb_put_uint32be(struct mbchain *mbp, u_int32_t x)
174 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
178 mb_put_uint32le(struct mbchain *mbp, u_int32_t x)
181 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
185 mb_put_int64be(struct mbchain *mbp, int64_t x)
188 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
192 mb_put_int64le(struct mbchain *mbp, int64_t x)
195 return mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM);
199 mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type)
204 int cplen, error, mleft, count;
207 mleft = mbp->mb_mleft;
211 if (m->m_next == NULL) {
212 m = m_getm(m, size, M_WAITOK, MT_DATA);
217 mleft = M_TRAILINGSPACE(m);
220 cplen = mleft > size ? size : mleft;
221 dst = mtod(m, caddr_t) + m->m_len;
224 error = mbp->mb_copy(mbp, source, dst, cplen);
229 for (src = source, count = cplen; count; count--)
233 bcopy(source, dst, cplen);
236 error = copyin(source, dst, cplen);
248 mbp->mb_count += cplen;
251 mbp->mb_mleft = mleft;
256 mb_put_mbuf(struct mbchain *mbp, struct mbuf *m)
258 mbp->mb_cur->m_next = m;
260 mbp->mb_count += m->m_len;
261 if (m->m_next == NULL)
265 mbp->mb_mleft = M_TRAILINGSPACE(m);
271 * copies a uio scatter/gather list to an mbuf chain.
274 mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size)
279 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
281 while (size > 0 && uiop->uio_resid) {
282 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
284 left = uiop->uio_iov->iov_len;
292 error = mb_put_mem(mbp, uiop->uio_iov->iov_base, left, mtype);
295 uiop->uio_offset += left;
296 uiop->uio_resid -= left;
297 uiop->uio_iov->iov_base += left;
298 uiop->uio_iov->iov_len -= left;
305 * Routines for fetching data from an mbuf chain
308 md_init(struct mdchain *mdp)
312 m = m_gethdr(M_WAITOK, MT_DATA);
315 m->m_pkthdr.rcvif = NULL;
322 md_initm(struct mdchain *mdp, struct mbuf *m)
324 bzero(mdp, sizeof(*mdp));
325 mdp->md_top = mdp->md_cur = m;
326 mdp->md_pos = mtod(m, u_char*);
330 md_done(struct mdchain *mdp)
333 m_freem(mdp->md_top);
339 * Append a separate mbuf chain. It is caller responsibility to prevent
340 * multiple calls to fetch/record routines.
343 md_append_record(struct mdchain *mdp, struct mbuf *top)
347 if (mdp->md_top == NULL) {
355 top->m_nextpkt = NULL;
360 * Put next record in place of existing
363 md_next_record(struct mdchain *mdp)
367 if (mdp->md_top == NULL)
369 m = mdp->md_top->m_nextpkt;
378 md_get_uint8(struct mdchain *mdp, u_int8_t *x)
380 return md_get_mem(mdp, x, 1, MB_MINLINE);
384 md_get_uint16(struct mdchain *mdp, u_int16_t *x)
386 return md_get_mem(mdp, (caddr_t)x, 2, MB_MINLINE);
390 md_get_uint16le(struct mdchain *mdp, u_int16_t *x)
393 int error = md_get_uint16(mdp, &v);
400 md_get_uint16be(struct mdchain *mdp, u_int16_t *x) {
402 int error = md_get_uint16(mdp, &v);
409 md_get_uint32(struct mdchain *mdp, u_int32_t *x)
411 return md_get_mem(mdp, (caddr_t)x, 4, MB_MINLINE);
415 md_get_uint32be(struct mdchain *mdp, u_int32_t *x)
420 error = md_get_uint32(mdp, &v);
426 md_get_uint32le(struct mdchain *mdp, u_int32_t *x)
431 error = md_get_uint32(mdp, &v);
437 md_get_int64(struct mdchain *mdp, int64_t *x)
439 return md_get_mem(mdp, (caddr_t)x, 8, MB_MINLINE);
443 md_get_int64be(struct mdchain *mdp, int64_t *x)
448 error = md_get_int64(mdp, &v);
454 md_get_int64le(struct mdchain *mdp, int64_t *x)
459 error = md_get_int64(mdp, &v);
465 md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type)
467 struct mbuf *m = mdp->md_cur;
474 MBERROR("incomplete copy\n");
478 count = mtod(m, u_char*) + m->m_len - s;
480 mdp->md_cur = m = m->m_next;
482 s = mdp->md_pos = mtod(m, caddr_t);
488 mdp->md_pos += count;
493 error = copyout(s, target, count);
498 bcopy(s, target, count);
511 md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **ret)
513 struct mbuf *m = mdp->md_cur, *rm;
515 rm = m_copym(m, mdp->md_pos - mtod(m, u_char*), size, M_WAITOK);
518 md_get_mem(mdp, NULL, size, MB_MZERO);
524 md_get_uio(struct mdchain *mdp, struct uio *uiop, int size)
530 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
531 while (size > 0 && uiop->uio_resid) {
532 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
534 left = uiop->uio_iov->iov_len;
540 uiocp = uiop->uio_iov->iov_base;
543 error = md_get_mem(mdp, uiocp, left, mtype);
546 uiop->uio_offset += left;
547 uiop->uio_resid -= left;
548 uiop->uio_iov->iov_base += left;
549 uiop->uio_iov->iov_len -= left;