| /* |
| * Copyright (c) 1982, 1986, 1988, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * @(#)mbuf.h 8.3 (Berkeley) 1/21/94 |
| * mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp |
| */ |
| |
| #ifndef MBUF_H |
| #define MBUF_H |
| |
| /* |
| * Macros for type conversion |
| * mtod(m,t) - convert mbuf pointer to data pointer of correct type |
| */ |
| #define mtod(m,t) ((t)(m)->m_data) |
| |
| /* XXX About mbufs for slirp: |
| * Only one mbuf is ever used in a chain, for each "cell" of data. |
| * m_nextpkt points to the next packet, if fragmented. |
| * If the data is too large, the M_EXT is used, and a larger block |
| * is alloced. Therefore, m_free[m] must check for M_EXT and if set |
| * free the m_ext. This is inefficient memory-wise, but who cares. |
| */ |
| |
| /* |
| * mbufs allow to have a gap between the start of the allocated buffer (m_ext if |
| * M_EXT is set, m_dat otherwise) and the in-use data: |
| * |
| * |--gapsize----->|---m_len-------> |
| * |----------m_size------------------------------> |
| * |----M_ROOM--------------------> |
| * |-M_FREEROOM--> |
| * |
| * ^ ^ ^ |
| * m_dat/m_ext m_data end of buffer |
| */ |
| |
| /* |
| * How much room is in the mbuf, from m_data to the end of the mbuf |
| */ |
| #define M_ROOM(m) ((m->m_flags & M_EXT)? \ |
| (((m)->m_ext + (m)->m_size) - (m)->m_data) \ |
| : \ |
| (((m)->m_dat + (m)->m_size) - (m)->m_data)) |
| |
| /* |
| * How much free room there is |
| */ |
| #define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len) |
| |
| struct mbuf { |
| /* XXX should union some of these! */ |
| /* header at beginning of each mbuf: */ |
| struct mbuf *m_next; /* Linked list of mbufs */ |
| struct mbuf *m_prev; |
| struct mbuf *m_nextpkt; /* Next packet in queue/record */ |
| struct mbuf *m_prevpkt; /* Flags aren't used in the output queue */ |
| int m_flags; /* Misc flags */ |
| |
| int m_size; /* Size of mbuf, from m_dat or m_ext */ |
| struct socket *m_so; |
| |
| caddr_t m_data; /* Current location of data */ |
| int m_len; /* Amount of data in this mbuf, from m_data */ |
| |
| Slirp *slirp; |
| bool resolution_requested; |
| uint64_t expiration_date; |
| char *m_ext; |
| /* start of dynamic buffer area, must be last element */ |
| char m_dat[]; |
| }; |
| |
| #define ifq_prev m_prev |
| #define ifq_next m_next |
| #define ifs_prev m_prevpkt |
| #define ifs_next m_nextpkt |
| #define ifq_so m_so |
| |
| #define M_EXT 0x01 /* m_ext points to more (malloced) data */ |
| #define M_FREELIST 0x02 /* mbuf is on free list */ |
| #define M_USEDLIST 0x04 /* XXX mbuf is on used list (for dtom()) */ |
| #define M_DOFREE 0x08 /* when m_free is called on the mbuf, free() |
| * it rather than putting it on the free list */ |
| |
| void m_init(Slirp *); |
| void m_cleanup(Slirp *slirp); |
| struct mbuf * m_get(Slirp *); |
| void m_free(struct mbuf *); |
| void m_cat(register struct mbuf *, register struct mbuf *); |
| void m_inc(struct mbuf *, int); |
| void m_adj(struct mbuf *, int); |
| int m_copy(struct mbuf *, struct mbuf *, int, int); |
| struct mbuf * dtom(Slirp *, void *); |
| |
| static inline void ifs_init(struct mbuf *ifm) |
| { |
| ifm->ifs_next = ifm->ifs_prev = ifm; |
| } |
| |
| #endif |