/*- * 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 #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); struct mbuf * m_getm2(struct mbuf *m, int len, int how, short type, int flags, int allonebuf); struct mbuf *m_uiotombuf(struct uio *uio, int how, int len, int align, int flags); u_int m_length(struct mbuf *m0, struct mbuf **last); struct mbuf *m_last(struct mbuf *m); /* mbuf initialization function */ void mbuf_initialize(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(uint32_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" /* * 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 */ uint16_t m_tag_id; /* Tag ID */ uint16_t m_tag_len; /* Length of data */ uint32_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 */ uint16_t tso_segsz; /* TSO segment size */ uint16_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_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_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[] */ /* * __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 */ /* * 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) #define M_SIZE(m) \ (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \ ((m)->m_flags & M_PKTHDR) ? MHLEN : \ MLEN) #endif