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Diffstat (limited to 'netwerk/sctp/src/user_mbuf.h')
| -rwxr-xr-x | netwerk/sctp/src/user_mbuf.h | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/netwerk/sctp/src/user_mbuf.h b/netwerk/sctp/src/user_mbuf.h new file mode 100755 index 000000000..f3717407e --- /dev/null +++ b/netwerk/sctp/src/user_mbuf.h @@ -0,0 +1,438 @@ +/*- + * 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. + * + */ + +#ifndef _USER_MBUF_H_ +#define _USER_MBUF_H_ + +/* __Userspace__ header file for mbufs */ +#include <stdio.h> +#if !defined(SCTP_SIMPLE_ALLOCATOR) +#include "umem.h" +#endif +#include "user_malloc.h" +#include "netinet/sctp_os_userspace.h" + +#define USING_MBUF_CONSTRUCTOR 0 + +/* For Linux */ +#ifndef MSIZE +#define MSIZE 256 +/* #define MSIZE 1024 */ +#endif +#ifndef MCLBYTES +#define MCLBYTES 2048 +#endif + +struct mbuf * m_gethdr(int how, short type); +struct mbuf * m_get(int how, short type); +struct mbuf * m_free(struct mbuf *m); +void m_clget(struct mbuf *m, int how); + + +/* mbuf initialization function */ +void mbuf_init(void *); + +#define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from)) +#define MGET(m, how, type) ((m) = m_get((how), (type))) +#define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type))) +#define MCLGET(m, how) m_clget((m), (how)) + + +#define M_HDR_PAD ((sizeof(intptr_t)==4) ? 2 : 6) /* modified for __Userspace__ */ + +/* Length to m_copy to copy all. */ +#define M_COPYALL 1000000000 + +/* umem_cache_t is defined in user_include/umem.h as + * typedef struct umem_cache umem_cache_t; + * Note:umem_zone_t is a pointer. + */ +#if defined(SCTP_SIMPLE_ALLOCATOR) +typedef size_t sctp_zone_t; +#else +typedef umem_cache_t *sctp_zone_t; +#endif + +extern sctp_zone_t zone_mbuf; +extern sctp_zone_t zone_clust; +extern sctp_zone_t zone_ext_refcnt; + +/*- + * Macros for type conversion: + * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. + * dtom(x) -- Convert data pointer within mbuf to mbuf pointer (XXX). + */ +#define mtod(m, t) ((t)((m)->m_data)) +#define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1))) + +struct mb_args { + int flags; /* Flags for mbuf being allocated */ + short type; /* Type of mbuf being allocated */ +}; + +struct clust_args { + struct mbuf * parent_mbuf; +}; + +struct mbuf * m_split(struct mbuf *, int, int); +void m_cat(struct mbuf *m, struct mbuf *n); +void m_adj(struct mbuf *, int); +void mb_free_ext(struct mbuf *); +void m_freem(struct mbuf *); +struct m_tag *m_tag_alloc(u_int32_t, int, int, int); +struct mbuf *m_copym(struct mbuf *, int, int, int); +void m_copyback(struct mbuf *, int, int, caddr_t); +struct mbuf *m_pullup(struct mbuf *, int); +struct mbuf *m_pulldown(struct mbuf *, int off, int len, int *offp); +int m_dup_pkthdr(struct mbuf *, struct mbuf *, int); +struct m_tag *m_tag_copy(struct m_tag *, int); +int m_tag_copy_chain(struct mbuf *, struct mbuf *, int); +struct mbuf *m_prepend(struct mbuf *, int, int); +void m_copydata(const struct mbuf *, int, int, caddr_t); + +#define MBUF_MEM_NAME "mbuf" +#define MBUF_CLUSTER_MEM_NAME "mbuf_cluster" +#define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt" + +#define MT_NOINIT 255 /* Not a type but a flag to allocate + a non-initialized mbuf */ + +/* + * General mbuf allocator statistics structure. + * __Userspace__ mbstat may be useful for gathering statistics. + * In the kernel many of these statistics are no longer used as + * they track allocator statistics through kernel UMA's built in statistics mechanism. + */ +struct mbstat { + u_long m_mbufs; /* XXX */ + u_long m_mclusts; /* XXX */ + + u_long m_drain; /* times drained protocols for space */ + u_long m_mcfail; /* XXX: times m_copym failed */ + u_long m_mpfail; /* XXX: times m_pullup failed */ + u_long m_msize; /* length of an mbuf */ + u_long m_mclbytes; /* length of an mbuf cluster */ + u_long m_minclsize; /* min length of data to allocate a cluster */ + u_long m_mlen; /* length of data in an mbuf */ + u_long m_mhlen; /* length of data in a header mbuf */ + + /* Number of mbtypes (gives # elems in mbtypes[] array: */ + short m_numtypes; + + /* XXX: Sendfile stats should eventually move to their own struct */ + u_long sf_iocnt; /* times sendfile had to do disk I/O */ + u_long sf_allocfail; /* times sfbuf allocation failed */ + u_long sf_allocwait; /* times sfbuf allocation had to wait */ +}; + + +/* + * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead. + * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in + * sys/param.h), which has no additional overhead and is used instead of the + * internal data area; this is done when at least MINCLSIZE of data must be + * stored. Additionally, it is possible to allocate a separate buffer + * externally and attach it to the mbuf in a way similar to that of mbuf + * clusters. + */ +#define MLEN ((int)(MSIZE - sizeof(struct m_hdr))) /* normal data len */ +#define MHLEN ((int)(MLEN - sizeof(struct pkthdr))) /* data len w/pkthdr */ +#define MINCLSIZE ((int)(MHLEN + 1)) /* smallest amount to put in cluster */ +#define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */ + + +/* + * Header present at the beginning of every mbuf. + */ +struct m_hdr { + struct mbuf *mh_next; /* next buffer in chain */ + struct mbuf *mh_nextpkt; /* next chain in queue/record */ + caddr_t mh_data; /* location of data */ + int mh_len; /* amount of data in this mbuf */ + int mh_flags; /* flags; see below */ + short mh_type; /* type of data in this mbuf */ + uint8_t pad[M_HDR_PAD];/* word align */ +}; + +/* + * Packet tag structure (see below for details). + */ +struct m_tag { + SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ + u_int16_t m_tag_id; /* Tag ID */ + u_int16_t m_tag_len; /* Length of data */ + u_int32_t m_tag_cookie; /* ABI/Module ID */ + void (*m_tag_free)(struct m_tag *); +}; + +/* + * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. + */ +struct pkthdr { + struct ifnet *rcvif; /* rcv interface */ + /* variables for ip and tcp reassembly */ + void *header; /* pointer to packet header */ + int len; /* total packet length */ + /* variables for hardware checksum */ + int csum_flags; /* flags regarding checksum */ + int csum_data; /* data field used by csum routines */ + u_int16_t tso_segsz; /* TSO segment size */ + u_int16_t ether_vtag; /* Ethernet 802.1p+q vlan tag */ + SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */ +}; + +/* + * Description of external storage mapped into mbuf; valid only if M_EXT is + * set. + */ +struct m_ext { + caddr_t ext_buf; /* start of buffer */ + void (*ext_free) /* free routine if not the usual */ + (void *, void *); + void *ext_args; /* optional argument pointer */ + u_int ext_size; /* size of buffer, for ext_free */ + volatile u_int *ref_cnt; /* pointer to ref count info */ + int ext_type; /* type of external storage */ +}; + + +/* + * The core of the mbuf object along with some shortcut defined for practical + * purposes. + */ +struct mbuf { + struct m_hdr m_hdr; + union { + struct { + struct pkthdr MH_pkthdr; /* M_PKTHDR set */ + union { + struct m_ext MH_ext; /* M_EXT set */ + char MH_databuf[MHLEN]; + } MH_dat; + } MH; + char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ + } M_dat; +}; + +#define m_next m_hdr.mh_next +#define m_len m_hdr.mh_len +#define m_data m_hdr.mh_data +#define m_type m_hdr.mh_type +#define m_flags m_hdr.mh_flags +#define m_nextpkt m_hdr.mh_nextpkt +#define m_act m_nextpkt +#define m_pkthdr M_dat.MH.MH_pkthdr +#define m_ext M_dat.MH.MH_dat.MH_ext +#define m_pktdat M_dat.MH.MH_dat.MH_databuf +#define m_dat M_dat.M_databuf + + +/* + * mbuf flags. + */ +#define M_EXT 0x0001 /* has associated external storage */ +#define M_PKTHDR 0x0002 /* start of record */ +#define M_EOR 0x0004 /* end of record */ +#define M_RDONLY 0x0008 /* associated data is marked read-only */ +#define M_PROTO1 0x0010 /* protocol-specific */ +#define M_PROTO2 0x0020 /* protocol-specific */ +#define M_PROTO3 0x0040 /* protocol-specific */ +#define M_PROTO4 0x0080 /* protocol-specific */ +#define M_PROTO5 0x0100 /* protocol-specific */ +#define M_SKIP_FIREWALL 0x4000 /* skip firewall processing */ +#define M_FREELIST 0x8000 /* mbuf is on the free list */ + + +/* + * Flags copied when copying m_pkthdr. + */ +#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_RDONLY|M_PROTO1|M_PROTO1|M_PROTO2|\ + M_PROTO3|M_PROTO4|M_PROTO5|M_SKIP_FIREWALL|\ + M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG|\ + M_VLANTAG|M_PROMISC) + + +/* + * mbuf pkthdr flags (also stored in m_flags). + */ +#define M_BCAST 0x0200 /* send/received as link-level broadcast */ +#define M_MCAST 0x0400 /* send/received as link-level multicast */ +#define M_FRAG 0x0800 /* packet is a fragment of a larger packet */ +#define M_FIRSTFRAG 0x1000 /* packet is first fragment */ +#define M_LASTFRAG 0x2000 /* packet is last fragment */ +#define M_VLANTAG 0x10000 /* ether_vtag is valid */ +#define M_PROMISC 0x20000 /* packet was not for us */ +#define M_NOFREE 0x40000 /* do not free mbuf - it is embedded in the cluster */ + + +/* + * External buffer types: identify ext_buf type. + */ +#define EXT_CLUSTER 1 /* mbuf cluster */ +#define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */ +#define EXT_JUMBOP 3 /* jumbo cluster 4096 bytes */ +#define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */ +#define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */ +#define EXT_PACKET 6 /* mbuf+cluster from packet zone */ +#define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */ +#define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */ +#define EXT_MOD_TYPE 200 /* custom module's ext_buf type */ +#define EXT_DISPOSABLE 300 /* can throw this buffer away w/page flipping */ +#define EXT_EXTREF 400 /* has externally maintained ref_cnt ptr */ + + +/* + * mbuf types. + */ +#define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */ +#define MT_DATA 1 /* dynamic (data) allocation */ +#define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */ +#define MT_SONAME 8 /* socket name */ +#define MT_CONTROL 14 /* extra-data protocol message */ +#define MT_OOBDATA 15 /* expedited data */ +#define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */ + +#define MT_NOINIT 255 /* Not a type but a flag to allocate + a non-initialized mbuf */ + +/* + * __Userspace__ flags like M_NOWAIT are defined in malloc.h + * Flags like these are used in functions like uma_zalloc() + * but don't have an equivalent in userland umem + * Flags specifying how an allocation should be made. + * + * The flag to use is as follows: + * - M_DONTWAIT or M_NOWAIT from an interrupt handler to not block allocation. + * - M_WAIT or M_WAITOK or M_TRYWAIT from wherever it is safe to block. + * + * M_DONTWAIT/M_NOWAIT means that we will not block the thread explicitly and + * if we cannot allocate immediately we may return NULL, whereas + * M_WAIT/M_WAITOK/M_TRYWAIT means that if we cannot allocate resources we + * will block until they are available, and thus never return NULL. + * + * XXX Eventually just phase this out to use M_WAITOK/M_NOWAIT. + */ +#define MBTOM(how) (how) + +void m_tag_delete(struct mbuf *, struct m_tag *); +void m_tag_delete_chain(struct mbuf *, struct m_tag *); +void m_move_pkthdr(struct mbuf *, struct mbuf *); +void m_tag_free_default(struct m_tag *); + +extern int max_linkhdr; /* Largest link-level header */ +extern int max_protohdr; /* Size of largest protocol layer header. See user_mbuf.c */ + +extern struct mbstat mbstat; /* General mbuf stats/infos */ + + +/* + * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can + * be both the local data payload, or an external buffer area, depending on + * whether M_EXT is set). + */ +#define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \ + (!(((m)->m_flags & M_EXT)) || \ + (*((m)->m_ext.ref_cnt) == 1)) ) \ + + +/* + * Compute the amount of space available before the current start of data in + * an mbuf. + * + * The M_WRITABLE() is a temporary, conservative safety measure: the burden + * of checking writability of the mbuf data area rests solely with the caller. + */ +#define M_LEADINGSPACE(m) \ + ((m)->m_flags & M_EXT ? \ + (M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ + (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ + (m)->m_data - (m)->m_dat) + +/* + * Compute the amount of space available after the end of data in an mbuf. + * + * The M_WRITABLE() is a temporary, conservative safety measure: the burden + * of checking writability of the mbuf data area rests solely with the caller. + */ +#define M_TRAILINGSPACE(m) \ + ((m)->m_flags & M_EXT ? \ + (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ + - ((m)->m_data + (m)->m_len) : 0) : \ + &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) + + + +/* + * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be + * allocated, how specifies whether to wait. If the allocation fails, the + * original mbuf chain is freed and m is set to NULL. + */ +#define M_PREPEND(m, plen, how) do { \ + struct mbuf **_mmp = &(m); \ + struct mbuf *_mm = *_mmp; \ + int _mplen = (plen); \ + int __mhow = (how); \ + \ + if (M_LEADINGSPACE(_mm) >= _mplen) { \ + _mm->m_data -= _mplen; \ + _mm->m_len += _mplen; \ + } else \ + _mm = m_prepend(_mm, _mplen, __mhow); \ + if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ + _mm->m_pkthdr.len += _mplen; \ + *_mmp = _mm; \ +} while (0) + +/* + * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an + * object of the specified size at the end of the mbuf, longword aligned. + */ +#define M_ALIGN(m, len) do { \ + KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)), \ + ("%s: M_ALIGN not normal mbuf", __func__)); \ + KASSERT((m)->m_data == (m)->m_dat, \ + ("%s: M_ALIGN not a virgin mbuf", __func__)); \ + (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ +} while (0) + +/* + * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by + * M_DUP/MOVE_PKTHDR. + */ +#define MH_ALIGN(m, len) do { \ + KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT), \ + ("%s: MH_ALIGN not PKTHDR mbuf", __func__)); \ + KASSERT((m)->m_data == (m)->m_pktdat, \ + ("%s: MH_ALIGN not a virgin mbuf", __func__)); \ + (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ +} while (0) + +#endif |