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Annotation of kernel/bsd/net/netbuf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Copyright (C) 1990 by NeXT, Inc., All Rights Reserved
        !            27:  *
        !            28:  */
        !            29: 
        !            30: /* 
        !            31:  * Network Buffer handling
        !            32:  * These should be used instead of mbufs. Currently, they are just
        !            33:  * wrappers around mbufs, but we hope to flush mbufs one day. Third parties
        !            34:  * must use this API, or risk breakage after an OS upgrade.
        !            35:  *
        !            36:  * HISTORY
        !            37:  * 09-Apr-90  Bradley Taylor (btaylor) at NeXT, Inc.
        !            38:  *     Created.
        !            39:  */
        !            40: 
        !            41: #import <sys/types.h>
        !            42: #import <sys/param.h>
        !            43: #import <sys/mbuf.h>
        !            44: #import <kernserv/machine/spl.h>
        !            45: #import <net/netbuf.h>
        !            46: 
        !            47: const char
        !            48:        IFCONTROL_SETFLAGS[] = "setflags",      
        !            49:        IFCONTROL_SETADDR[] = "setaddr",
        !            50:        IFCONTROL_GETADDR[] = "getaddr",
        !            51:        IFCONTROL_AUTOADDR[] = "autoaddr",
        !            52:        IFCONTROL_UNIXIOCTL[] = "unix-ioctl",
        !            53:        IFCONTROL_RCVPROMISCUOUS[] = "promiscuous-on",
        !            54:        IFCONTROL_RCVPROMISCOFF[] = "promiscuous-off",
        !            55:        IFCONTROL_ADDMULTICAST[] = "add-multicast",
        !            56:        IFCONTROL_RMVMULTICAST[] = "rmv-multicast";
        !            57: 
        !            58: static void
        !            59: nb_alloc_free(
        !            60:              void *orig_data
        !            61:              )
        !            62: {
        !            63:        int orig_size = *(unsigned *)orig_data;
        !            64: 
        !            65:         if ( orig_size <= MCLBYTES ) {
        !            66:                MCLFREE( orig_data );
        !            67:        } else {
        !            68:                kfree(orig_data, orig_size);
        !            69:        }
        !            70: }
        !            71: 
        !            72: void
        !            73: nb_delayed_free(void *data, unsigned size, void *orig_data)
        !            74: {
        !            75:        int orig_size = *(unsigned *)orig_data;
        !            76: 
        !            77:         if ( orig_size <= MCLBYTES ) {
        !            78:                MCLFREE( orig_data );
        !            79:        } else {
        !            80:                kfree(orig_data, orig_size);
        !            81:         }
        !            82: }
        !            83: 
        !            84: 
        !            85: 
        !            86: netbuf_t
        !            87: nb_alloc(
        !            88:         unsigned data_size
        !            89:         )
        !            90: {
        !            91:        void *data;
        !            92:        netbuf_t nb;
        !            93:        unsigned *orig_data;
        !            94:        unsigned orig_size;
        !            95: 
        !            96:        orig_size = data_size + 0x20;           /* Add cache-line size to request */
        !            97: 
        !            98:         if ( orig_size <= MCLBYTES ) {
        !            99:                MCLALLOC( orig_data, M_DONTWAIT );
        !           100:         } else { 
        !           101:                orig_data = (unsigned *)kalloc(orig_size);
        !           102:         }
        !           103:        if (orig_data == NULL) {
        !           104:                return (NULL);
        !           105:        }
        !           106:        orig_data[0] = orig_size;
        !           107:        data = (void *)&orig_data[1];
        !           108:         data = (void *)(((unsigned int)data + 0x1F) & ~0x1F);  /* Align to cache-line boundary */
        !           109:        nb = nb_alloc_wrapper(data, data_size, 
        !           110:                              nb_delayed_free, 
        !           111:                              (void *)orig_data);
        !           112:        if (nb == NULL) {
        !           113:                nb_alloc_free((void *)orig_data);
        !           114:                return (NULL);
        !           115:        }
        !           116: 
        !           117:        return (nb);
        !           118: }
        !           119: struct mbuf *
        !           120: mclgetx(fun, arg, addr, len, wait)
        !           121:        int (*fun)(), arg, len, wait;
        !           122:        caddr_t addr;
        !           123: {
        !           124:        register struct mbuf *m;
        !           125: 
        !           126:        MGETHDR(m, wait, MT_DATA);
        !           127:        if (m == 0)
        !           128:                return (0);
        !           129: //     m->m_off = (int)addr - (int)m;
        !           130: //     m->m_len = len;
        !           131: //     m->m_cltype = MCL_LOANED;
        !           132: //     m->m_clfun = fun;
        !           133: //     m->m_clarg = arg;
        !           134: //     m->m_clswp = NULL;
        !           135:        m->m_ext.ext_buf = addr;
        !           136:        m->m_ext.ext_free = fun;
        !           137:        m->m_ext.ext_size = len;
        !           138:        m->m_ext.ext_arg = arg;
        !           139:        m->m_ext.ext_refs.forward = m->m_ext.ext_refs.backward =
        !           140:                        &m->m_ext.ext_refs;
        !           141:        m->m_data = addr;
        !           142:        m->m_flags |= M_EXT;
        !           143:        m->m_pkthdr.len = len;
        !           144:        m->m_len = len;
        !           145: 
        !           146:        return (m);
        !           147: }
        !           148: 
        !           149: netbuf_t
        !           150: nb_alloc_wrapper(
        !           151:                 void *data,
        !           152:                 unsigned data_size,
        !           153:                 void data_free(void *arg),
        !           154:                 void *data_free_arg
        !           155:                 )
        !           156: {
        !           157:        struct mbuf *m;
        !           158:        m = mclgetx(data_free, data_free_arg, data, data_size, M_DONTWAIT);
        !           159:        if (m == NULL) {
        !           160:                return (NULL);
        !           161:        }
        !           162:        return ((netbuf_t)m);
        !           163: }
        !           164: 
        !           165: char *
        !           166: nb_map(netbuf_t nb)
        !           167: {
        !           168:        return (mtod(((struct mbuf *)nb), char *));
        !           169: }
        !           170: 
        !           171: void
        !           172: nb_free(netbuf_t nb)
        !           173: {
        !           174:        m_freem((struct mbuf *)nb);
        !           175: }
        !           176: 
        !           177: unsigned
        !           178: nb_size(netbuf_t nb)
        !           179: {
        !           180:        return (((struct mbuf *)nb)->m_len);
        !           181: }
        !           182: 
        !           183: int
        !           184: nb_read(netbuf_t nb, unsigned offset, unsigned size, void *target)
        !           185: {
        !           186:        struct mbuf *m = (struct mbuf *)nb;
        !           187:        void *data;
        !           188:        
        !           189:        if (offset + size > m->m_len) {
        !           190:                return (-1);
        !           191:        }
        !           192:        data = mtod(m, void *);
        !           193:        bcopy(data + offset, target, size);
        !           194:        return (0);
        !           195: }
        !           196: 
        !           197: int
        !           198: nb_write(netbuf_t nb, unsigned offset, unsigned size, void *source)
        !           199: {
        !           200:        struct mbuf *m = (struct mbuf *)nb;
        !           201:        void *data;
        !           202:        
        !           203:        if (offset + size > m->m_len) {
        !           204:                return (-1);
        !           205:        }
        !           206:        data = mtod(m, void *);
        !           207:        bcopy(source, data + offset, size);
        !           208:        return (0);
        !           209: }
        !           210: /* Remember to look at the PPP and slip interfaces, which bypassses the
        !           211:  * m_data field XXXX : (AR, CCG 6/30/95)
        !           212:  */
        !           213: int
        !           214: nb_shrink_top(netbuf_t nb, unsigned size)
        !           215: {
        !           216:        struct mbuf *m = (struct mbuf *)nb;
        !           217:        
        !           218:        m->m_len -= size;
        !           219:        m->m_data += size;
        !           220:        return (0); /* XXX should error check */
        !           221: }
        !           222: 
        !           223: int
        !           224: nb_grow_top(netbuf_t nb, unsigned size)
        !           225: {
        !           226:        struct mbuf *m = (struct mbuf *)nb;
        !           227:        
        !           228:        m->m_len += size;
        !           229:        m->m_data -= size;
        !           230:        return (0); /* XXX should error check */
        !           231: }
        !           232: 
        !           233: int
        !           234: nb_shrink_bot(netbuf_t nb, unsigned size)
        !           235: {
        !           236:        struct mbuf *m = (struct mbuf *)nb;
        !           237:        
        !           238:        m->m_len -= size;
        !           239:        return (0); /* XXX should error check */
        !           240: }
        !           241: 
        !           242: 
        !           243: int
        !           244: nb_grow_bot(netbuf_t nb, unsigned size)
        !           245: {
        !           246:        struct mbuf *m = (struct mbuf *)nb;
        !           247:        
        !           248:        m->m_len += size;
        !           249:        return (0); /* XXX should error check */
        !           250: }
        !           251: 
        !           252: int
        !           253: nb_aligned_copy(netbuf_t nb, unsigned aligned)
        !           254: {
        !           255:        struct mbuf *m = (struct mbuf *)nb;
        !           256:        unsigned char *buf_p, *buf_m;
        !           257:        
        !           258:        buf_p = buf_m = mtod(m, unsigned char *);
        !           259:        buf_m -= aligned;
        !           260:        if (buf_p != buf_m)
        !           261:          memmove(buf_m, buf_p,  m->m_len);
        !           262:        m->m_data = buf_m;
        !           263:        return(0);
        !           264: }

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