508 lines
18 KiB
C
508 lines
18 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mbuf.h 8.5 (Berkeley) 2/19/95
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* $FreeBSD$
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*/
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#ifndef _SYS_MBUF_H_
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#define _SYS_MBUF_H_
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/*
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* Mbufs are of a single size, MSIZE (machine/param.h), which
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* includes overhead. An mbuf may add a single "mbuf cluster" of size
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* MCLBYTES (also in machine/param.h), which has no additional overhead
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* and is used instead of the internal data area; this is done when
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* at least MINCLSIZE of data must be stored. Additionally, it is possible
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* to allocate a separate buffer externally and attach it to the mbuf in
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* a way similar to that of mbuf clusters.
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*/
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#define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
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#define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
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#define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */
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#define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
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#ifdef _KERNEL
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/*-
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* Macros for type conversion:
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* mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
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* dtom(x) -- Convert data pointer within mbuf to mbuf pointer (XXX).
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*/
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#define mtod(m, t) ((t)((m)->m_data))
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#define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1)))
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#endif /* _KERNEL */
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/*
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* Header present at the beginning of every mbuf.
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*/
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struct m_hdr {
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struct mbuf *mh_next; /* next buffer in chain */
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struct mbuf *mh_nextpkt; /* next chain in queue/record */
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caddr_t mh_data; /* location of data */
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int mh_len; /* amount of data in this mbuf */
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short mh_type; /* type of data in this mbuf */
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short mh_flags; /* flags; see below */
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};
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/*
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* Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
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*/
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struct pkthdr {
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struct ifnet *rcvif; /* rcv interface */
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int len; /* total packet length */
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/* variables for ip and tcp reassembly */
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void *header; /* pointer to packet header */
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/* variables for hardware checksum */
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int csum_flags; /* flags regarding checksum */
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int csum_data; /* data field used by csum routines */
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struct mbuf *aux; /* extra data buffer; ipsec/others */
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};
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/*
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* Description of external storage mapped into mbuf; valid only if M_EXT is set.
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*/
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struct m_ext {
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caddr_t ext_buf; /* start of buffer */
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void (*ext_free) /* free routine if not the usual */
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(void *, void *);
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void *ext_args; /* optional argument pointer */
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u_int ext_size; /* size of buffer, for ext_free */
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u_int *ref_cnt; /* pointer to ref count info */
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int ext_type; /* type of external storage */
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};
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/*
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* The core of the mbuf object along with some shortcut defines for
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* practical purposes.
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*/
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struct mbuf {
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struct m_hdr m_hdr;
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union {
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struct {
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struct pkthdr MH_pkthdr; /* M_PKTHDR set */
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union {
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struct m_ext MH_ext; /* M_EXT set */
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char MH_databuf[MHLEN];
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} MH_dat;
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} MH;
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char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
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} M_dat;
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};
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#define m_next m_hdr.mh_next
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#define m_len m_hdr.mh_len
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#define m_data m_hdr.mh_data
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#define m_type m_hdr.mh_type
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#define m_flags m_hdr.mh_flags
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#define m_nextpkt m_hdr.mh_nextpkt
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#define m_act m_nextpkt
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#define m_pkthdr M_dat.MH.MH_pkthdr
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#define m_ext M_dat.MH.MH_dat.MH_ext
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#define m_pktdat M_dat.MH.MH_dat.MH_databuf
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#define m_dat M_dat.M_databuf
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/*
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* mbuf flags.
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*/
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#define M_EXT 0x0001 /* has associated external storage */
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#define M_PKTHDR 0x0002 /* start of record */
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#define M_EOR 0x0004 /* end of record */
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#define M_RDONLY 0x0008 /* associated data is marked read-only */
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#define M_PROTO1 0x0010 /* protocol-specific */
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#define M_PROTO2 0x0020 /* protocol-specific */
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#define M_PROTO3 0x0040 /* protocol-specific */
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#define M_PROTO4 0x0080 /* protocol-specific */
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#define M_PROTO5 0x0100 /* protocol-specific */
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/*
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* mbuf pkthdr flags (also stored in m_flags).
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*/
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#define M_BCAST 0x0200 /* send/received as link-level broadcast */
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#define M_MCAST 0x0400 /* send/received as link-level multicast */
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#define M_FRAG 0x0800 /* packet is a fragment of a larger packet */
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#define M_FIRSTFRAG 0x1000 /* packet is first fragment */
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#define M_LASTFRAG 0x2000 /* packet is last fragment */
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/*
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* External buffer types: identify ext_buf type.
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*/
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#define EXT_CLUSTER 1 /* mbuf cluster */
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#define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */
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#define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */
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#define EXT_MOD_TYPE 200 /* custom module's ext_buf type */
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#define EXT_DISPOSABLE 300 /* can throw this buffer away w/page flipping */
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/*
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* Flags copied when copying m_pkthdr.
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*/
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#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
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M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG|M_RDONLY)
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/*
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* Flags indicating hw checksum support and sw checksum requirements.
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*/
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#define CSUM_IP 0x0001 /* will csum IP */
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#define CSUM_TCP 0x0002 /* will csum TCP */
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#define CSUM_UDP 0x0004 /* will csum UDP */
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#define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
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#define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
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#define CSUM_IP_CHECKED 0x0100 /* did csum IP */
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#define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
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#define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
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#define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
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#define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
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#define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
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/*
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* mbuf types.
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*/
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#define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
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#define MT_DATA 1 /* dynamic (data) allocation */
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#define MT_HEADER 2 /* packet header */
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#if 0
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#define MT_SOCKET 3 /* socket structure */
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#define MT_PCB 4 /* protocol control block */
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#define MT_RTABLE 5 /* routing tables */
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#define MT_HTABLE 6 /* IMP host tables */
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#define MT_ATABLE 7 /* address resolution tables */
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#endif
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#define MT_SONAME 8 /* socket name */
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#if 0
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#define MT_SOOPTS 10 /* socket options */
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#endif
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#define MT_FTABLE 11 /* fragment reassembly header */
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#if 0
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#define MT_RIGHTS 12 /* access rights */
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#define MT_IFADDR 13 /* interface address */
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#endif
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#define MT_TAG 13 /* volatile metadata associated to pkts */
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#define MT_CONTROL 14 /* extra-data protocol message */
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#define MT_OOBDATA 15 /* expedited data */
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#define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
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/*
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* Mbuf and cluster allocation statistics PCPU structure.
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*/
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struct mbpstat {
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u_long mb_mbfree;
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u_long mb_mbpgs;
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u_long mb_clfree;
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u_long mb_clpgs;
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long mb_mbtypes[MT_NTYPES];
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short mb_active;
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};
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/*
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* General mbuf allocator statistics structure.
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* XXX: Modifications of these are not protected by any mutex locks nor by
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* any atomic() manipulations. As a result, we may occasionally lose
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* a count or two. Luckily, not all of these fields are modified at all
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* and remain static, and those that are manipulated are only manipulated
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* in failure situations, which do not occur (hopefully) very often.
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*/
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struct mbstat {
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u_long m_drops; /* times failed to allocate */
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u_long m_wait; /* times succesfully returned from wait */
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u_long m_drain; /* times drained protocols for space */
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u_long m_mcfail; /* XXX: times m_copym failed */
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u_long m_mpfail; /* XXX: times m_pullup failed */
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u_long m_msize; /* length of an mbuf */
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u_long m_mclbytes; /* length of an mbuf cluster */
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u_long m_minclsize; /* min length of data to allocate a cluster */
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u_long m_mlen; /* length of data in an mbuf */
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u_long m_mhlen; /* length of data in a header mbuf */
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/* Number of mbtypes (gives # elems in mbpstat's mb_mbtypes[] array: */
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short m_numtypes;
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};
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/*
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* Flags specifying how an allocation should be made.
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* M_DONTWAIT means "don't block if nothing is available" whereas
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* M_TRYWAIT means "block for mbuf_wait ticks at most if nothing is
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* available."
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*/
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#define M_DONTWAIT 1
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#define M_TRYWAIT 0
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#define M_WAIT M_TRYWAIT /* XXX: Deprecated. */
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#ifdef _KERNEL
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/*-
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* mbuf external reference count management macros.
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*
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* MEXT_IS_REF(m): true if (m) is not the only mbuf referencing
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* the external buffer ext_buf.
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*
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* MEXT_REM_REF(m): remove reference to m_ext object.
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*
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* MEXT_ADD_REF(m): add reference to m_ext object already
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* referred to by (m).
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*/
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#define MEXT_IS_REF(m) (*((m)->m_ext.ref_cnt) > 1)
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#define MEXT_REM_REF(m) do { \
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KASSERT(*((m)->m_ext.ref_cnt) > 0, ("m_ext refcnt < 0")); \
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atomic_subtract_int((m)->m_ext.ref_cnt, 1); \
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} while(0)
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#define MEXT_ADD_REF(m) atomic_add_int((m)->m_ext.ref_cnt, 1)
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/*
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* mbuf, cluster, and external object allocation macros
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* (for compatibility purposes).
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*/
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#define m_getclr m_get_clrd
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#define MGET(m, how, type) (m) = m_get((how), (type))
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#define MGETHDR(m, how, type) (m) = m_gethdr((how), (type))
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#define MCLGET(m, how) m_clget((m), (how))
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#define MEXTADD(m, buf, size, free, args, flags, type) \
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m_extadd((m), (caddr_t)(buf), (size), (free), (args), (flags), (type))
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/*
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* MEXTFREE(m): disassociate (and possibly free) an external object from (m).
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*
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* If the atomic_cmpset_int() returns 0, then we effectively do nothing
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* in terms of "cleaning up" (freeing the ext buf and ref. counter) as
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* this means that either there are still references, or another thread
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* is taking care of the clean-up.
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*/
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#define MEXTFREE(m) do { \
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struct mbuf *_mb = (m); \
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\
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MEXT_REM_REF(_mb); \
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if (atomic_cmpset_int(_mb->m_ext.ref_cnt, 0, 1)) \
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_mext_free(_mb); \
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_mb->m_flags &= ~M_EXT; \
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} while (0)
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/*
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* Evaluate TRUE if it's safe to write to the mbuf m's data region (this
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* can be both the local data payload, or an external buffer area,
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* depending on whether M_EXT is set).
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*/
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#define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && (!((m)->m_flags \
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& M_EXT) || !MEXT_IS_REF(m)))
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/*-
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* Copy mbuf pkthdr from "from" to "to".
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* "from" must have M_PKTHDR set, and "to" must be empty.
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* aux pointer will be moved to "to".
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*/
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#define M_COPY_PKTHDR(to, from) do { \
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struct mbuf *_mfrom = (from); \
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struct mbuf *_mto = (to); \
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\
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_mto->m_data = _mto->m_pktdat; \
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_mto->m_flags = _mfrom->m_flags & M_COPYFLAGS; \
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_mto->m_pkthdr = _mfrom->m_pkthdr; \
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_mfrom->m_pkthdr.aux = NULL; \
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} while (0)
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/*
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* Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
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* an object of the specified size at the end of the mbuf, longword aligned.
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*/
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#define M_ALIGN(m, len) do { \
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(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
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} while (0)
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/*
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* As above, for mbufs allocated with m_gethdr/MGETHDR
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* or initialized by M_COPY_PKTHDR.
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*/
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#define MH_ALIGN(m, len) do { \
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(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
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} while (0)
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/*
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* Compute the amount of space available
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* before the current start of data in an mbuf.
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*
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* The M_WRITABLE() is a temporary, conservative safety measure: the burden
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* of checking writability of the mbuf data area rests solely with the caller.
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*/
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#define M_LEADINGSPACE(m) \
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((m)->m_flags & M_EXT ? \
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(M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
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(m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
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(m)->m_data - (m)->m_dat)
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/*
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* Compute the amount of space available
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* after the end of data in an mbuf.
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*
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* The M_WRITABLE() is a temporary, conservative safety measure: the burden
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* of checking writability of the mbuf data area rests solely with the caller.
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*/
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#define M_TRAILINGSPACE(m) \
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((m)->m_flags & M_EXT ? \
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(M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
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- ((m)->m_data + (m)->m_len) : 0) : \
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&(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
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/*
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* Arrange to prepend space of size plen to mbuf m.
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* If a new mbuf must be allocated, how specifies whether to wait.
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* If the allocation fails, the original mbuf chain is freed and m is
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* set to NULL.
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*/
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#define M_PREPEND(m, plen, how) do { \
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struct mbuf **_mmp = &(m); \
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struct mbuf *_mm = *_mmp; \
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int _mplen = (plen); \
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int __mhow = (how); \
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\
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if (M_LEADINGSPACE(_mm) >= _mplen) { \
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_mm->m_data -= _mplen; \
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_mm->m_len += _mplen; \
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} else \
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_mm = m_prepend(_mm, _mplen, __mhow); \
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if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
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_mm->m_pkthdr.len += _mplen; \
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*_mmp = _mm; \
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} while (0)
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/*
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* Change mbuf to new type.
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* This is a relatively expensive operation and should be avoided.
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*/
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#define MCHTYPE(m, t) m_chtype((m), (t))
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/* Length to m_copy to copy all. */
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#define M_COPYALL 1000000000
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/* Compatibility with 4.3 */
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#define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT)
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/*
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* pkthdr.aux type tags.
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*/
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struct mauxtag {
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int af;
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int type;
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void *p;
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};
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/*
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* Some packet tags to identify different mbuf annotations.
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*
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* Eventually, these annotations will end up in an appropriate chain
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* (struct m_tag or similar, e.g. as in NetBSD) properly managed by
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* the mbuf handling routines.
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*
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* As a temporary and low impact solution to replace the even uglier
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* approach used so far in some parts of the network stack (which relies
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* on global variables), these annotations are stored in MT_TAG
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* mbufs (or lookalikes) prepended to the actual mbuf chain.
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*
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* m_type = MT_TAG
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* m_flags = m_tag_id
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* m_next = next buffer in chain.
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*
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* BE VERY CAREFUL not to pass these blocks to the mbuf handling routines.
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*
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*/
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#define m_tag_id m_hdr.mh_flags
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/* Packet tag types -- first ones are from NetBSD */
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#define PACKET_TAG_NONE 0 /* Nadda */
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#define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
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#define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
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#define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
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#define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
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#define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */
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#define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */
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#define PACKET_TAG_BRIDGE 7 /* Bridge processing done */
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#define PACKET_TAG_GIF 8 /* GIF processing done */
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#define PACKET_TAG_GRE 9 /* GRE processing done */
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#define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */
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#define PACKET_TAG_ENCAP 11 /* Encap. processing */
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#define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */
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#define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */
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#define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */
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/* Packet tags used in the FreeBSD network stack */
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#define PACKET_TAG_DUMMYNET 15 /* dummynet info */
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#define PACKET_TAG_IPFW 16 /* ipfw classification */
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#define PACKET_TAG_DIVERT 17 /* divert info */
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#define PACKET_TAG_IPFORWARD 18 /* ipforward info */
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#define PACKET_TAG_MAX 19
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extern int max_datalen; /* MHLEN - max_hdr */
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extern int max_hdr; /* largest link + protocol header */
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extern int max_linkhdr; /* largest link-level header */
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extern int max_protohdr; /* largest protocol header */
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extern struct mbpstat mb_statpcpu[]; /* Per-CPU allocation stats. */
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extern struct mbstat mbstat; /* General mbuf stats/infos. */
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extern int nmbclusters; /* Maximum number of clusters */
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extern int nmbcnt; /* Scale kmem_map for counter space */
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extern int nmbufs; /* Maximum number of mbufs */
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extern int nsfbufs; /* Number of sendfile(2) bufs */
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void _mext_free(struct mbuf *);
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void m_adj(struct mbuf *, int);
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struct mbuf *m_aux_add(struct mbuf *, int, int);
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struct mbuf *m_aux_add2(struct mbuf *, int, int, void *);
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void m_aux_delete(struct mbuf *, struct mbuf *);
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struct mbuf *m_aux_find(struct mbuf *, int, int);
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struct mbuf *m_aux_find2(struct mbuf *, int, int, void *);
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void m_cat(struct mbuf *, struct mbuf *);
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void m_chtype(struct mbuf *, short);
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void m_clget(struct mbuf *, int);
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void m_extadd(struct mbuf *, caddr_t, u_int,
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void (*free)(void *, void *), void *, short, int);
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void m_copyback(struct mbuf *, int, int, caddr_t);
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void m_copydata(const struct mbuf *, int, int, caddr_t);
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struct mbuf *m_copym(struct mbuf *, int, int, int);
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struct mbuf *m_copypacket(struct mbuf *, int);
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struct mbuf *m_devget(char *, int, int, struct ifnet *,
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void (*copy)(char *, caddr_t, u_int));
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struct mbuf *m_dup(struct mbuf *, int);
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struct mbuf *m_free(struct mbuf *);
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void m_freem(struct mbuf *);
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struct mbuf *m_get(int, int);
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struct mbuf *m_get_clrd(int, int);
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struct mbuf *m_gethdr(int, int);
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struct mbuf *m_gethdr_clrd(int, int);
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struct mbuf *m_getm(struct mbuf *, int, int, int);
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struct mbuf *m_prepend(struct mbuf *, int, int);
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void m_print(const struct mbuf *m);
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struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
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struct mbuf *m_pullup(struct mbuf *, int);
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struct mbuf *m_split(struct mbuf *, int, int);
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#endif /* _KERNEL */
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#endif /* !_SYS_MBUF_H_ */
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