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 * 4. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/sysctl.h>
36 #include <sys/endian.h>
37 #include <sys/errno.h>
38 #include <sys/malloc.h>
40 #include <sys/module.h>
43 #include <sys/mchain.h>
45 FEATURE(libmchain, "mchain library");
47 MODULE_VERSION(libmchain, 1);
49 #define MBERROR(format, ...) printf("%s(%d): "format, __func__ , \
50 __LINE__ , ## __VA_ARGS__)
52 #define MBPANIC(format, ...) printf("%s(%d): "format, __func__ , \
53 __LINE__ , ## __VA_ARGS__)
56 * Various helper functions
59 mb_init(struct mbchain *mbp)
63 m = m_gethdr(M_WAITOK, MT_DATA);
70 mb_initm(struct mbchain *mbp, struct mbuf *m)
72 bzero(mbp, sizeof(*mbp));
73 mbp->mb_top = mbp->mb_cur = m;
74 mbp->mb_mleft = M_TRAILINGSPACE(m);
78 mb_done(struct mbchain *mbp)
87 mb_detach(struct mbchain *mbp)
97 mb_fixhdr(struct mbchain *mbp)
99 return (mbp->mb_top->m_pkthdr.len = m_fixhdr(mbp->mb_top));
103 * Check if object of size 'size' fit to the current position and
104 * allocate new mbuf if not. Advance pointers and increase length of mbuf(s).
105 * Return pointer to the object placeholder or NULL if any error occurred.
106 * Note: size should be <= MLEN
109 mb_reserve(struct mbchain *mbp, int size)
115 panic("mb_reserve: size = %d\n", size);
117 if (mbp->mb_mleft < size) {
118 mn = m_get(M_WAITOK, MT_DATA);
119 mbp->mb_cur = m->m_next = mn;
122 mbp->mb_mleft = M_TRAILINGSPACE(m);
124 mbp->mb_mleft -= size;
125 mbp->mb_count += size;
126 bpos = mtod(m, caddr_t) + m->m_len;
132 mb_put_padbyte(struct mbchain *mbp)
137 dst = mtod(mbp->mb_cur, caddr_t) + mbp->mb_cur->m_len;
139 /* Only add padding if address is odd */
140 if ((unsigned long)dst & 1)
141 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
147 mb_put_uint8(struct mbchain *mbp, uint8_t x)
149 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
153 mb_put_uint16be(struct mbchain *mbp, uint16_t x)
156 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
160 mb_put_uint16le(struct mbchain *mbp, uint16_t x)
163 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
167 mb_put_uint32be(struct mbchain *mbp, uint32_t x)
170 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
174 mb_put_uint32le(struct mbchain *mbp, uint32_t x)
177 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
181 mb_put_int64be(struct mbchain *mbp, int64_t x)
184 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
188 mb_put_int64le(struct mbchain *mbp, int64_t x)
191 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM));
195 mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type)
200 int cplen, error, mleft, count;
201 size_t srclen, dstlen;
204 mleft = mbp->mb_mleft;
208 if (m->m_next == NULL)
209 m = m_getm(m, size, M_WAITOK, MT_DATA);
212 mleft = M_TRAILINGSPACE(m);
215 cplen = mleft > size ? size : mleft;
216 srclen = dstlen = cplen;
217 dst = mtod(m, caddr_t) + m->m_len;
222 error = mbp->mb_copy(mbp, source, dst, &srclen, &dstlen);
227 for (src = source, count = cplen; count; count--)
231 bcopy(source, dst, cplen);
234 error = copyin(source, dst, cplen);
246 mbp->mb_count += dstlen;
249 mbp->mb_mleft = mleft;
254 mb_put_mbuf(struct mbchain *mbp, struct mbuf *m)
256 mbp->mb_cur->m_next = m;
258 mbp->mb_count += m->m_len;
259 if (m->m_next == NULL)
263 mbp->mb_mleft = M_TRAILINGSPACE(m);
269 * copies a uio scatter/gather list to an mbuf chain.
272 mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size)
277 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
279 while (size > 0 && uiop->uio_resid) {
280 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
282 left = uiop->uio_iov->iov_len;
290 error = mb_put_mem(mbp, uiop->uio_iov->iov_base, left, mtype);
293 uiop->uio_offset += left;
294 uiop->uio_resid -= left;
295 uiop->uio_iov->iov_base =
296 (char *)uiop->uio_iov->iov_base + left;
297 uiop->uio_iov->iov_len -= left;
304 * Routines for fetching data from an mbuf chain
307 md_init(struct mdchain *mdp)
311 m = m_gethdr(M_WAITOK, MT_DATA);
318 md_initm(struct mdchain *mdp, struct mbuf *m)
320 bzero(mdp, sizeof(*mdp));
321 mdp->md_top = mdp->md_cur = m;
322 mdp->md_pos = mtod(m, u_char*);
326 md_done(struct mdchain *mdp)
329 m_freem(mdp->md_top);
335 * Append a separate mbuf chain. It is caller responsibility to prevent
336 * multiple calls to fetch/record routines.
339 md_append_record(struct mdchain *mdp, struct mbuf *top)
343 if (mdp->md_top == NULL) {
351 top->m_nextpkt = NULL;
356 * Put next record in place of existing
359 md_next_record(struct mdchain *mdp)
363 if (mdp->md_top == NULL)
365 m = mdp->md_top->m_nextpkt;
374 md_get_uint8(struct mdchain *mdp, uint8_t *x)
376 return (md_get_mem(mdp, x, 1, MB_MINLINE));
380 md_get_uint16(struct mdchain *mdp, uint16_t *x)
382 return (md_get_mem(mdp, (caddr_t)x, 2, MB_MINLINE));
386 md_get_uint16le(struct mdchain *mdp, uint16_t *x)
389 int error = md_get_uint16(mdp, &v);
397 md_get_uint16be(struct mdchain *mdp, uint16_t *x)
400 int error = md_get_uint16(mdp, &v);
408 md_get_uint32(struct mdchain *mdp, uint32_t *x)
410 return (md_get_mem(mdp, (caddr_t)x, 4, MB_MINLINE));
414 md_get_uint32be(struct mdchain *mdp, uint32_t *x)
419 error = md_get_uint32(mdp, &v);
426 md_get_uint32le(struct mdchain *mdp, uint32_t *x)
431 error = md_get_uint32(mdp, &v);
438 md_get_int64(struct mdchain *mdp, int64_t *x)
440 return (md_get_mem(mdp, (caddr_t)x, 8, MB_MINLINE));
444 md_get_int64be(struct mdchain *mdp, int64_t *x)
449 error = md_get_int64(mdp, &v);
456 md_get_int64le(struct mdchain *mdp, int64_t *x)
461 error = md_get_int64(mdp, &v);
468 md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type)
470 struct mbuf *m = mdp->md_cur;
477 MBERROR("incomplete copy\n");
481 count = mtod(m, u_char*) + m->m_len - s;
483 mdp->md_cur = m = m->m_next;
485 s = mdp->md_pos = mtod(m, caddr_t);
491 mdp->md_pos += count;
496 error = copyout(s, target, count);
501 bcopy(s, target, count);
514 md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **ret)
516 struct mbuf *m = mdp->md_cur, *rm;
518 rm = m_copym(m, mdp->md_pos - mtod(m, u_char*), size, M_WAITOK);
519 md_get_mem(mdp, NULL, size, MB_MZERO);
525 md_get_uio(struct mdchain *mdp, struct uio *uiop, int size)
531 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER;
532 while (size > 0 && uiop->uio_resid) {
533 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
535 left = uiop->uio_iov->iov_len;
541 uiocp = uiop->uio_iov->iov_base;
544 error = md_get_mem(mdp, uiocp, left, mtype);
547 uiop->uio_offset += left;
548 uiop->uio_resid -= left;
549 uiop->uio_iov->iov_base =
550 (char *)uiop->uio_iov->iov_base + left;
551 uiop->uio_iov->iov_len -= left;