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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* 
        !            23:  * Copyright (C) 1990 by NeXT, Inc., All Rights Reserved
        !            24:  *
        !            25:  */
        !            26: 
        !            27: /* 
        !            28:  * Network Buffer handling
        !            29:  * These should be used instead of mbufs. Currently, they are just
        !            30:  * wrappers around mbufs, but we hope to flush mbufs one day. Third parties
        !            31:  * must use this API, or risk breakage after an OS upgrade.
        !            32:  *
        !            33:  * HISTORY
        !            34:  * 09-Apr-90  Bradley Taylor (btaylor) at NeXT, Inc.
        !            35:  *     Created.
        !            36:  */
        !            37: 
        !            38: #import <sys/types.h>
        !            39: #import <sys/param.h>
        !            40: #import <sys/mbuf.h>
        !            41: #import <machine/spl.h>
        !            42: #import <net/netbuf.h>
        !            43: 
        !            44: const char
        !            45:        IFCONTROL_SETFLAGS[] = "setflags",      
        !            46:        IFCONTROL_SETADDR[] = "setaddr",
        !            47:        IFCONTROL_GETADDR[] = "getaddr",
        !            48:        IFCONTROL_AUTOADDR[] = "autoaddr",
        !            49:        IFCONTROL_UNIXIOCTL[] = "unix-ioctl",
        !            50:        IFCONTROL_RCVPROMISCUOUS[] = "promiscuous-on",
        !            51:        IFCONTROL_RCVPROMISCOFF[] = "promiscuous-off",
        !            52:        IFCONTROL_ADDMULTICAST[] = "add-multicast",
        !            53:        IFCONTROL_RMVMULTICAST[] = "rmv-multicast";
        !            54: 
        !            55: static void
        !            56: nb_alloc_free(
        !            57:              void *orig_data
        !            58:              )
        !            59: {
        !            60:        int orig_size = *(unsigned *)orig_data;
        !            61: 
        !            62:         if ( orig_size <= MCLBYTES ) {
        !            63:                MCLFREE( orig_data );
        !            64:        } else {
        !            65:                kfree(orig_data, orig_size);
        !            66:        }
        !            67: }
        !            68: 
        !            69: void
        !            70: nb_delayed_free(void *data, unsigned size, void *orig_data)
        !            71: {
        !            72:        int orig_size = *(unsigned *)orig_data;
        !            73: 
        !            74:         if ( orig_size <= MCLBYTES ) {
        !            75:                MCLFREE( orig_data );
        !            76:        } else {
        !            77:                kfree(orig_data, orig_size);
        !            78:         }
        !            79: }
        !            80: 
        !            81: 
        !            82: 
        !            83: netbuf_t
        !            84: nb_alloc(
        !            85:         unsigned data_size
        !            86:         )
        !            87: {
        !            88:        void *data;
        !            89:        netbuf_t nb;
        !            90:        unsigned *orig_data;
        !            91:        unsigned orig_size;
        !            92: 
        !            93:        orig_size = data_size + 0x20;           /* Add cache-line size to request */
        !            94: 
        !            95:         if ( orig_size <= MCLBYTES ) {
        !            96:                MCLALLOC( orig_data, M_DONTWAIT );
        !            97:         } else { 
        !            98:                orig_data = (unsigned *)kalloc(orig_size);
        !            99:         }
        !           100:        if (orig_data == NULL) {
        !           101:                return (NULL);
        !           102:        }
        !           103:        orig_data[0] = orig_size;
        !           104:        data = (void *)&orig_data[1];
        !           105:         data = (void *)(((unsigned int)data + 0x1F) & ~0x1F);  /* Align to cache-line boundary */
        !           106:        nb = nb_alloc_wrapper(data, data_size, 
        !           107:                              nb_delayed_free, 
        !           108:                              (void *)orig_data);
        !           109:        if (nb == NULL) {
        !           110:                nb_alloc_free((void *)orig_data);
        !           111:                return (NULL);
        !           112:        }
        !           113: 
        !           114:        return (nb);
        !           115: }
        !           116: struct mbuf *
        !           117: mclgetx(fun, arg, addr, len, wait)
        !           118:        int (*fun)(), arg, len, wait;
        !           119:        caddr_t addr;
        !           120: {
        !           121:        register struct mbuf *m;
        !           122: 
        !           123:        MGETHDR(m, wait, MT_DATA);
        !           124:        if (m == 0)
        !           125:                return (0);
        !           126: //     m->m_off = (int)addr - (int)m;
        !           127: //     m->m_len = len;
        !           128: //     m->m_cltype = MCL_LOANED;
        !           129: //     m->m_clfun = fun;
        !           130: //     m->m_clarg = arg;
        !           131: //     m->m_clswp = NULL;
        !           132:        m->m_ext.ext_buf = addr;
        !           133:        m->m_ext.ext_free = fun;
        !           134:        m->m_ext.ext_size = len;
        !           135:        m->m_ext.ext_arg = arg;
        !           136:        m->m_ext.ext_refs.forward = m->m_ext.ext_refs.backward =
        !           137:                        &m->m_ext.ext_refs;
        !           138:        m->m_data = addr;
        !           139:        m->m_flags |= M_EXT;
        !           140:        m->m_pkthdr.len = len;
        !           141:        m->m_len = len;
        !           142: 
        !           143:        return (m);
        !           144: }
        !           145: 
        !           146: netbuf_t
        !           147: nb_alloc_wrapper(
        !           148:                 void *data,
        !           149:                 unsigned data_size,
        !           150:                 void data_free(void *arg),
        !           151:                 void *data_free_arg
        !           152:                 )
        !           153: {
        !           154:        struct mbuf *m;
        !           155:        m = mclgetx(data_free, data_free_arg, data, data_size, M_DONTWAIT);
        !           156:        if (m == NULL) {
        !           157:                return (NULL);
        !           158:        }
        !           159:        return ((netbuf_t)m);
        !           160: }
        !           161: 
        !           162: char *
        !           163: nb_map(netbuf_t nb)
        !           164: {
        !           165:        return (mtod(((struct mbuf *)nb), char *));
        !           166: }
        !           167: 
        !           168: void
        !           169: nb_free(netbuf_t nb)
        !           170: {
        !           171:        m_freem((struct mbuf *)nb);
        !           172: }
        !           173: 
        !           174: unsigned
        !           175: nb_size(netbuf_t nb)
        !           176: {
        !           177:        return (((struct mbuf *)nb)->m_len);
        !           178: }
        !           179: 
        !           180: int
        !           181: nb_read(netbuf_t nb, unsigned offset, unsigned size, void *target)
        !           182: {
        !           183:        struct mbuf *m = (struct mbuf *)nb;
        !           184:        void *data;
        !           185:        
        !           186:        if (offset + size > m->m_len) {
        !           187:                return (-1);
        !           188:        }
        !           189:        data = mtod(m, void *);
        !           190:        bcopy(data + offset, target, size);
        !           191:        return (0);
        !           192: }
        !           193: 
        !           194: int
        !           195: nb_write(netbuf_t nb, unsigned offset, unsigned size, void *source)
        !           196: {
        !           197:        struct mbuf *m = (struct mbuf *)nb;
        !           198:        void *data;
        !           199:        
        !           200:        if (offset + size > m->m_len) {
        !           201:                return (-1);
        !           202:        }
        !           203:        data = mtod(m, void *);
        !           204:        bcopy(source, data + offset, size);
        !           205:        return (0);
        !           206: }
        !           207: /* Remember to look at the PPP and slip interfaces, which bypassses the
        !           208:  * m_data field XXXX : (AR, CCG 6/30/95)
        !           209:  */
        !           210: int
        !           211: nb_shrink_top(netbuf_t nb, unsigned size)
        !           212: {
        !           213:        struct mbuf *m = (struct mbuf *)nb;
        !           214:        
        !           215:        m->m_len -= size;
        !           216:        m->m_data += size;
        !           217:        return (0); /* XXX should error check */
        !           218: }
        !           219: 
        !           220: int
        !           221: nb_grow_top(netbuf_t nb, unsigned size)
        !           222: {
        !           223:        struct mbuf *m = (struct mbuf *)nb;
        !           224:        
        !           225:        m->m_len += size;
        !           226:        m->m_data -= size;
        !           227:        return (0); /* XXX should error check */
        !           228: }
        !           229: 
        !           230: int
        !           231: nb_shrink_bot(netbuf_t nb, unsigned size)
        !           232: {
        !           233:        struct mbuf *m = (struct mbuf *)nb;
        !           234:        
        !           235:        m->m_len -= size;
        !           236:        return (0); /* XXX should error check */
        !           237: }
        !           238: 
        !           239: 
        !           240: int
        !           241: nb_grow_bot(netbuf_t nb, unsigned size)
        !           242: {
        !           243:        struct mbuf *m = (struct mbuf *)nb;
        !           244:        
        !           245:        m->m_len += size;
        !           246:        return (0); /* XXX should error check */
        !           247: }
        !           248: 
        !           249: int
        !           250: nb_aligned_copy(netbuf_t nb, unsigned aligned)
        !           251: {
        !           252:        struct mbuf *m = (struct mbuf *)nb;
        !           253:        unsigned char *buf_p, *buf_m;
        !           254:        
        !           255:        buf_p = buf_m = mtod(m, unsigned char *);
        !           256:        buf_m -= aligned;
        !           257:        if (buf_p != buf_m)
        !           258:          memmove(buf_m, buf_p,  m->m_len);
        !           259:        m->m_data = buf_m;
        !           260:        return(0);
        !           261: }

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