mirror of
https://git.FreeBSD.org/src.git
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420 lines
9.0 KiB
C
420 lines
9.0 KiB
C
/*
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* PPP Memory handling module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <termios.h>
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#include "defs.h"
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#include "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "descriptor.h"
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#include "prompt.h"
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#include "main.h"
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#define BUCKET_CHUNK 20
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#define BUCKET_HASH 256
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struct mbucket;
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struct mfree {
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struct mbucket *next;
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size_t count;
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};
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static struct mbucket {
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union {
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struct mbuf m;
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struct mfree f;
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} u;
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} *bucket[(M_MAXLEN + sizeof(struct mbuf)) / BUCKET_HASH];
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#define M_BINDEX(sz) (((sz) + sizeof(struct mbuf) - 1) / BUCKET_HASH)
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#define M_BUCKET(sz) (bucket + M_BINDEX(sz))
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#define M_ROUNDUP(sz) ((M_BINDEX(sz) + 1) * BUCKET_HASH)
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static struct memmap {
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struct mbuf *queue;
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size_t fragments;
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size_t octets;
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} MemMap[MB_MAX + 1];
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static unsigned long long mbuf_Mallocs, mbuf_Frees;
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int
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m_length(struct mbuf *bp)
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{
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int len;
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for (len = 0; bp; bp = bp->m_next)
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len += bp->m_len;
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return len;
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}
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struct mbuf *
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m_get(size_t m_len, int type)
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{
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struct mbucket **mb;
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struct mbuf *bp;
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size_t size;
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if (type > MB_MAX) {
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log_Printf(LogERROR, "Bad mbuf type %d\n", type);
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type = MB_UNKNOWN;
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}
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if (m_len > M_MAXLEN || m_len == 0) {
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log_Printf(LogERROR, "Request for mbuf size %lu denied\n", (u_long)m_len);
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AbortProgram(EX_OSERR);
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}
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mb = M_BUCKET(m_len);
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size = M_ROUNDUP(m_len);
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if (*mb) {
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/* We've got some free blocks of the right size */
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bp = &(*mb)->u.m;
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if (--(*mb)->u.f.count == 0)
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*mb = (*mb)->u.f.next;
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else {
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((struct mbucket *)((char *)*mb + size))->u.f.count = (*mb)->u.f.count;
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*mb = (struct mbucket *)((char *)*mb + size);
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(*mb)->u.f.next = NULL;
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}
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} else {
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/*
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* Allocate another chunk of mbufs, use the first and put the rest on
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* the free list
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*/
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*mb = (struct mbucket *)malloc(BUCKET_CHUNK * size);
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if (*mb == NULL) {
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log_Printf(LogALERT, "Failed to allocate memory (%lu)\n",
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(unsigned long)BUCKET_CHUNK * size);
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AbortProgram(EX_OSERR);
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}
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bp = &(*mb)->u.m;
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*mb = (struct mbucket *)((char *)*mb + size);
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(*mb)->u.f.count = BUCKET_CHUNK - 1;
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(*mb)->u.f.next = NULL;
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}
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mbuf_Mallocs++;
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memset(bp, '\0', sizeof(struct mbuf));
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bp->m_size = size - sizeof *bp;
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bp->m_len = m_len;
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bp->m_type = type;
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MemMap[type].fragments++;
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MemMap[type].octets += bp->m_size;
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return bp;
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}
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struct mbuf *
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m_free(struct mbuf *bp)
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{
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struct mbucket **mb, *f;
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struct mbuf *nbp;
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if ((f = (struct mbucket *)bp) != NULL) {
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MemMap[bp->m_type].fragments--;
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MemMap[bp->m_type].octets -= bp->m_size;
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nbp = bp->m_next;
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mb = M_BUCKET(bp->m_size);
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f->u.f.next = *mb;
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f->u.f.count = 1;
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*mb = f;
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mbuf_Frees++;
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bp = nbp;
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}
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return bp;
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}
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void
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m_freem(struct mbuf *bp)
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{
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while (bp)
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bp = m_free(bp);
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}
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struct mbuf *
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mbuf_Read(struct mbuf *bp, void *v, size_t len)
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{
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int nb;
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u_char *ptr = v;
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while (bp && len > 0) {
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if (len > bp->m_len)
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nb = bp->m_len;
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else
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nb = len;
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if (nb) {
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memcpy(ptr, MBUF_CTOP(bp), nb);
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ptr += nb;
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bp->m_len -= nb;
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len -= nb;
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bp->m_offset += nb;
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}
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if (bp->m_len == 0)
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bp = m_free(bp);
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}
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while (bp && bp->m_len == 0)
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bp = m_free(bp);
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return bp;
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}
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size_t
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mbuf_View(struct mbuf *bp, void *v, size_t len)
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{
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size_t nb, l = len;
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u_char *ptr = v;
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while (bp && l > 0) {
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if (l > bp->m_len)
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nb = bp->m_len;
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else
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nb = l;
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memcpy(ptr, MBUF_CTOP(bp), nb);
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ptr += nb;
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l -= nb;
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bp = bp->m_next;
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}
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return len - l;
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}
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struct mbuf *
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m_prepend(struct mbuf *bp, const void *ptr, size_t len, size_t extra)
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{
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struct mbuf *head;
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if (bp && bp->m_offset) {
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if (bp->m_offset >= len) {
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bp->m_offset -= len;
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bp->m_len += len;
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memcpy(MBUF_CTOP(bp), ptr, len);
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return bp;
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}
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len -= bp->m_offset;
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memcpy(bp + 1, (const char *)ptr + len, bp->m_offset);
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bp->m_len += bp->m_offset;
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bp->m_offset = 0;
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}
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head = m_get(len + extra, bp ? bp->m_type : MB_UNKNOWN);
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head->m_offset = extra;
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head->m_len -= extra;
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if (ptr)
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memcpy(MBUF_CTOP(head), ptr, len);
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head->m_next = bp;
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return head;
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}
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struct mbuf *
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m_adj(struct mbuf *bp, ssize_t n)
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{
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if (n > 0) {
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while (bp) {
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if (n < bp->m_len) {
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bp->m_len = n;
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bp->m_offset += n;
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return bp;
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}
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n -= bp->m_len;
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bp = m_free(bp);
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}
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} else {
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if ((n = m_length(bp) + n) <= 0) {
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m_freem(bp);
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return NULL;
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}
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for (; bp; bp = bp->m_next, n -= bp->m_len)
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if (n < bp->m_len) {
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bp->m_len = n;
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m_freem(bp->m_next);
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bp->m_next = NULL;
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break;
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}
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}
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return bp;
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}
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void
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mbuf_Write(struct mbuf *bp, const void *ptr, size_t m_len)
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{
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int plen;
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int nb;
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plen = m_length(bp);
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if (plen < m_len)
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m_len = plen;
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while (m_len > 0) {
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nb = (m_len < bp->m_len) ? m_len : bp->m_len;
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memcpy(MBUF_CTOP(bp), ptr, nb);
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m_len -= bp->m_len;
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bp = bp->m_next;
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}
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}
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int
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mbuf_Show(struct cmdargs const *arg)
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{
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int i;
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static const char * const mbuftype[] = {
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"ip in", "ip out", "nat in", "nat out", "mp in", "mp out",
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"vj in", "vj out", "icompd in", "icompd out", "compd in", "compd out",
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"lqr in", "lqr out", "echo in", "echo out", "proto in", "proto out",
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"acf in", "acf out", "sync in", "sync out", "hdlc in", "hdlc out",
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"async in", "async out", "cbcp in", "cbcp out", "chap in", "chap out",
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"pap in", "pap out", "ccp in", "ccp out", "ipcp in", "ipcp out",
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"lcp in", "lcp out", "unknown"
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};
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prompt_Printf(arg->prompt, "Fragments (octets) in use:\n");
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for (i = 0; i < MB_MAX; i += 2)
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prompt_Printf(arg->prompt, "%10.10s: %04lu (%06lu)\t"
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"%10.10s: %04lu (%06lu)\n",
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mbuftype[i], (u_long)MemMap[i].fragments,
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(u_long)MemMap[i].octets, mbuftype[i+1],
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(u_long)MemMap[i+1].fragments, (u_long)MemMap[i+1].octets);
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if (i == MB_MAX)
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prompt_Printf(arg->prompt, "%10.10s: %04lu (%06lu)\n",
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mbuftype[i], (u_long)MemMap[i].fragments,
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(u_long)MemMap[i].octets);
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prompt_Printf(arg->prompt, "Mallocs: %llu, Frees: %llu\n",
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mbuf_Mallocs, mbuf_Frees);
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return 0;
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}
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struct mbuf *
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m_dequeue(struct mqueue *q)
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{
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struct mbuf *bp;
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log_Printf(LogDEBUG, "m_dequeue: queue len = %lu\n", (u_long)q->len);
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bp = q->top;
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if (bp) {
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q->top = q->top->m_nextpkt;
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q->len--;
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if (q->top == NULL) {
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q->last = q->top;
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if (q->len)
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log_Printf(LogERROR, "m_dequeue: Not zero (%lu)!!!\n",
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(u_long)q->len);
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}
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bp->m_nextpkt = NULL;
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}
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return bp;
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}
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void
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m_enqueue(struct mqueue *queue, struct mbuf *bp)
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{
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if (bp != NULL) {
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if (queue->last) {
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queue->last->m_nextpkt = bp;
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queue->last = bp;
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} else
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queue->last = queue->top = bp;
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queue->len++;
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log_Printf(LogDEBUG, "m_enqueue: len = %lu\n", (unsigned long)queue->len);
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}
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}
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struct mbuf *
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m_pullup(struct mbuf *bp)
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{
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/* Put it all in one contigous (aligned) mbuf */
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if (bp != NULL) {
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if (bp->m_next != NULL) {
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struct mbuf *nbp;
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u_char *cp;
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nbp = m_get(m_length(bp), bp->m_type);
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for (cp = MBUF_CTOP(nbp); bp; bp = m_free(bp)) {
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memcpy(cp, MBUF_CTOP(bp), bp->m_len);
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cp += bp->m_len;
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}
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bp = nbp;
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}
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#ifndef __i386__ /* Do any other archs not care about alignment ? */
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else if ((bp->m_offset & (sizeof(long) - 1)) != 0) {
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bcopy(MBUF_CTOP(bp), bp + 1, bp->m_len);
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bp->m_offset = 0;
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}
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#endif
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}
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return bp;
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}
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void
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m_settype(struct mbuf *bp, int type)
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{
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for (; bp; bp = bp->m_next)
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if (type != bp->m_type) {
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MemMap[bp->m_type].fragments--;
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MemMap[bp->m_type].octets -= bp->m_size;
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bp->m_type = type;
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MemMap[type].fragments++;
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MemMap[type].octets += bp->m_size;
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}
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}
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struct mbuf *
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m_append(struct mbuf *bp, const void *v, size_t sz)
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{
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struct mbuf *m = bp;
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if (m) {
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while (m->m_next)
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m = m->m_next;
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if (m->m_size - m->m_len > sz)
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m->m_len += sz;
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else
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m->m_next = m_prepend(NULL, v, sz, 0);
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} else
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bp = m_prepend(NULL, v, sz, 0);
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return bp;
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}
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