1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32 #ifndef _USER_MBUF_H_ 33 #define _USER_MBUF_H_ 34 35 /* __Userspace__ header file for mbufs */ 36 #include <stdio.h> 37 #if !defined(SCTP_SIMPLE_ALLOCATOR) 38 #include "umem.h" 39 #endif 40 #include "user_malloc.h" 41 #include "netinet/sctp_os_userspace.h" 42 43 #define USING_MBUF_CONSTRUCTOR 0 44 45 /* For Linux */ 46 #ifndef MSIZE 47 #define MSIZE 256 48 /* #define MSIZE 1024 */ 49 #endif 50 #ifndef MCLBYTES 51 #define MCLBYTES 2048 52 #endif 53 54 struct mbuf * m_gethdr(int how, short type); 55 struct mbuf * m_get(int how, short type); 56 struct mbuf * m_free(struct mbuf *m); 57 void m_clget(struct mbuf *m, int how); 58 59 60 /* mbuf initialization function */ 61 void mbuf_init(void *); 62 63 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from)) 64 #define MGET(m, how, type) ((m) = m_get((how), (type))) 65 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type))) 66 #define MCLGET(m, how) m_clget((m), (how)) 67 68 69 #define M_HDR_PAD ((sizeof(intptr_t)==4) ? 2 : 6) /* modified for __Userspace__ */ 70 71 /* Length to m_copy to copy all. */ 72 #define M_COPYALL 1000000000 73 74 /* umem_cache_t is defined in user_include/umem.h as 75 * typedef struct umem_cache umem_cache_t; 76 * Note:umem_zone_t is a pointer. 77 */ 78 #if defined(SCTP_SIMPLE_ALLOCATOR) 79 typedef size_t sctp_zone_t; 80 #else 81 typedef umem_cache_t *sctp_zone_t; 82 #endif 83 84 extern sctp_zone_t zone_mbuf; 85 extern sctp_zone_t zone_clust; 86 extern sctp_zone_t zone_ext_refcnt; 87 88 /*- 89 * Macros for type conversion: 90 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type. 91 * dtom(x) -- Convert data pointer within mbuf to mbuf pointer (XXX). 92 */ 93 #define mtod(m, t) ((t)((m)->m_data)) 94 #define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1))) 95 96 struct mb_args { 97 int flags; /* Flags for mbuf being allocated */ 98 short type; /* Type of mbuf being allocated */ 99 }; 100 101 struct clust_args { 102 struct mbuf * parent_mbuf; 103 }; 104 105 struct mbuf * m_split(struct mbuf *, int, int); 106 void m_cat(struct mbuf *m, struct mbuf *n); 107 void m_adj(struct mbuf *, int); 108 void mb_free_ext(struct mbuf *); 109 void m_freem(struct mbuf *); 110 struct m_tag *m_tag_alloc(u_int32_t, int, int, int); 111 struct mbuf *m_copym(struct mbuf *, int, int, int); 112 void m_copyback(struct mbuf *, int, int, caddr_t); 113 struct mbuf *m_pullup(struct mbuf *, int); 114 struct mbuf *m_pulldown(struct mbuf *, int off, int len, int *offp); 115 int m_dup_pkthdr(struct mbuf *, struct mbuf *, int); 116 struct m_tag *m_tag_copy(struct m_tag *, int); 117 int m_tag_copy_chain(struct mbuf *, struct mbuf *, int); 118 struct mbuf *m_prepend(struct mbuf *, int, int); 119 void m_copydata(const struct mbuf *, int, int, caddr_t); 120 121 #define MBUF_MEM_NAME "mbuf" 122 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster" 123 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt" 124 125 #define MT_NOINIT 255 /* Not a type but a flag to allocate 126 a non-initialized mbuf */ 127 128 /* 129 * General mbuf allocator statistics structure. 130 * __Userspace__ mbstat may be useful for gathering statistics. 131 * In the kernel many of these statistics are no longer used as 132 * they track allocator statistics through kernel UMA's built in statistics mechanism. 133 */ 134 struct mbstat { 135 u_long m_mbufs; /* XXX */ 136 u_long m_mclusts; /* XXX */ 137 138 u_long m_drain; /* times drained protocols for space */ 139 u_long m_mcfail; /* XXX: times m_copym failed */ 140 u_long m_mpfail; /* XXX: times m_pullup failed */ 141 u_long m_msize; /* length of an mbuf */ 142 u_long m_mclbytes; /* length of an mbuf cluster */ 143 u_long m_minclsize; /* min length of data to allocate a cluster */ 144 u_long m_mlen; /* length of data in an mbuf */ 145 u_long m_mhlen; /* length of data in a header mbuf */ 146 147 /* Number of mbtypes (gives # elems in mbtypes[] array: */ 148 short m_numtypes; 149 150 /* XXX: Sendfile stats should eventually move to their own struct */ 151 u_long sf_iocnt; /* times sendfile had to do disk I/O */ 152 u_long sf_allocfail; /* times sfbuf allocation failed */ 153 u_long sf_allocwait; /* times sfbuf allocation had to wait */ 154 }; 155 156 157 /* 158 * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead. 159 * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in 160 * sys/param.h), which has no additional overhead and is used instead of the 161 * internal data area; this is done when at least MINCLSIZE of data must be 162 * stored. Additionally, it is possible to allocate a separate buffer 163 * externally and attach it to the mbuf in a way similar to that of mbuf 164 * clusters. 165 */ 166 #define MLEN ((int)(MSIZE - sizeof(struct m_hdr))) /* normal data len */ 167 #define MHLEN ((int)(MLEN - sizeof(struct pkthdr))) /* data len w/pkthdr */ 168 #define MINCLSIZE ((int)(MHLEN + 1)) /* smallest amount to put in cluster */ 169 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */ 170 171 172 /* 173 * Header present at the beginning of every mbuf. 174 */ 175 struct m_hdr { 176 struct mbuf *mh_next; /* next buffer in chain */ 177 struct mbuf *mh_nextpkt; /* next chain in queue/record */ 178 caddr_t mh_data; /* location of data */ 179 int mh_len; /* amount of data in this mbuf */ 180 int mh_flags; /* flags; see below */ 181 short mh_type; /* type of data in this mbuf */ 182 uint8_t pad[M_HDR_PAD];/* word align */ 183 }; 184 185 /* 186 * Packet tag structure (see below for details). 187 */ 188 struct m_tag { 189 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */ 190 u_int16_t m_tag_id; /* Tag ID */ 191 u_int16_t m_tag_len; /* Length of data */ 192 u_int32_t m_tag_cookie; /* ABI/Module ID */ 193 void (*m_tag_free)(struct m_tag *); 194 }; 195 196 /* 197 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set. 198 */ 199 struct pkthdr { 200 struct ifnet *rcvif; /* rcv interface */ 201 /* variables for ip and tcp reassembly */ 202 void *header; /* pointer to packet header */ 203 int len; /* total packet length */ 204 /* variables for hardware checksum */ 205 int csum_flags; /* flags regarding checksum */ 206 int csum_data; /* data field used by csum routines */ 207 u_int16_t tso_segsz; /* TSO segment size */ 208 u_int16_t ether_vtag; /* Ethernet 802.1p+q vlan tag */ 209 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */ 210 }; 211 212 /* 213 * Description of external storage mapped into mbuf; valid only if M_EXT is 214 * set. 215 */ 216 struct m_ext { 217 caddr_t ext_buf; /* start of buffer */ 218 void (*ext_free) /* free routine if not the usual */ 219 (void *, void *); 220 void *ext_args; /* optional argument pointer */ 221 u_int ext_size; /* size of buffer, for ext_free */ 222 volatile u_int *ref_cnt; /* pointer to ref count info */ 223 int ext_type; /* type of external storage */ 224 }; 225 226 227 /* 228 * The core of the mbuf object along with some shortcut defined for practical 229 * purposes. 230 */ 231 struct mbuf { 232 struct m_hdr m_hdr; 233 union { 234 struct { 235 struct pkthdr MH_pkthdr; /* M_PKTHDR set */ 236 union { 237 struct m_ext MH_ext; /* M_EXT set */ 238 char MH_databuf[MHLEN]; 239 } MH_dat; 240 } MH; 241 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ 242 } M_dat; 243 }; 244 245 #define m_next m_hdr.mh_next 246 #define m_len m_hdr.mh_len 247 #define m_data m_hdr.mh_data 248 #define m_type m_hdr.mh_type 249 #define m_flags m_hdr.mh_flags 250 #define m_nextpkt m_hdr.mh_nextpkt 251 #define m_act m_nextpkt 252 #define m_pkthdr M_dat.MH.MH_pkthdr 253 #define m_ext M_dat.MH.MH_dat.MH_ext 254 #define m_pktdat M_dat.MH.MH_dat.MH_databuf 255 #define m_dat M_dat.M_databuf 256 257 258 /* 259 * mbuf flags. 260 */ 261 #define M_EXT 0x0001 /* has associated external storage */ 262 #define M_PKTHDR 0x0002 /* start of record */ 263 #define M_EOR 0x0004 /* end of record */ 264 #define M_RDONLY 0x0008 /* associated data is marked read-only */ 265 #define M_PROTO1 0x0010 /* protocol-specific */ 266 #define M_PROTO2 0x0020 /* protocol-specific */ 267 #define M_PROTO3 0x0040 /* protocol-specific */ 268 #define M_PROTO4 0x0080 /* protocol-specific */ 269 #define M_PROTO5 0x0100 /* protocol-specific */ 270 #define M_SKIP_FIREWALL 0x4000 /* skip firewall processing */ 271 #define M_FREELIST 0x8000 /* mbuf is on the free list */ 272 273 274 /* 275 * Flags copied when copying m_pkthdr. 276 */ 277 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_RDONLY|M_PROTO1|M_PROTO1|M_PROTO2|\ 278 M_PROTO3|M_PROTO4|M_PROTO5|M_SKIP_FIREWALL|\ 279 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG|\ 280 M_VLANTAG|M_PROMISC) 281 282 283 /* 284 * mbuf pkthdr flags (also stored in m_flags). 285 */ 286 #define M_BCAST 0x0200 /* send/received as link-level broadcast */ 287 #define M_MCAST 0x0400 /* send/received as link-level multicast */ 288 #define M_FRAG 0x0800 /* packet is a fragment of a larger packet */ 289 #define M_FIRSTFRAG 0x1000 /* packet is first fragment */ 290 #define M_LASTFRAG 0x2000 /* packet is last fragment */ 291 #define M_VLANTAG 0x10000 /* ether_vtag is valid */ 292 #define M_PROMISC 0x20000 /* packet was not for us */ 293 #define M_NOFREE 0x40000 /* do not free mbuf - it is embedded in the cluster */ 294 295 296 /* 297 * External buffer types: identify ext_buf type. 298 */ 299 #define EXT_CLUSTER 1 /* mbuf cluster */ 300 #define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */ 301 #define EXT_JUMBOP 3 /* jumbo cluster 4096 bytes */ 302 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */ 303 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */ 304 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */ 305 #define EXT_MBUF 7 /* external mbuf reference (M_IOVEC) */ 306 #define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */ 307 #define EXT_MOD_TYPE 200 /* custom module's ext_buf type */ 308 #define EXT_DISPOSABLE 300 /* can throw this buffer away w/page flipping */ 309 #define EXT_EXTREF 400 /* has externally maintained ref_cnt ptr */ 310 311 312 /* 313 * mbuf types. 314 */ 315 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */ 316 #define MT_DATA 1 /* dynamic (data) allocation */ 317 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */ 318 #define MT_SONAME 8 /* socket name */ 319 #define MT_CONTROL 14 /* extra-data protocol message */ 320 #define MT_OOBDATA 15 /* expedited data */ 321 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */ 322 323 #define MT_NOINIT 255 /* Not a type but a flag to allocate 324 a non-initialized mbuf */ 325 326 /* 327 * __Userspace__ flags like M_NOWAIT are defined in malloc.h 328 * Flags like these are used in functions like uma_zalloc() 329 * but don't have an equivalent in userland umem 330 * Flags specifying how an allocation should be made. 331 * 332 * The flag to use is as follows: 333 * - M_DONTWAIT or M_NOWAIT from an interrupt handler to not block allocation. 334 * - M_WAIT or M_WAITOK or M_TRYWAIT from wherever it is safe to block. 335 * 336 * M_DONTWAIT/M_NOWAIT means that we will not block the thread explicitly and 337 * if we cannot allocate immediately we may return NULL, whereas 338 * M_WAIT/M_WAITOK/M_TRYWAIT means that if we cannot allocate resources we 339 * will block until they are available, and thus never return NULL. 340 * 341 * XXX Eventually just phase this out to use M_WAITOK/M_NOWAIT. 342 */ 343 #define MBTOM(how) (how) 344 345 void m_tag_delete(struct mbuf *, struct m_tag *); 346 void m_tag_delete_chain(struct mbuf *, struct m_tag *); 347 void m_move_pkthdr(struct mbuf *, struct mbuf *); 348 void m_tag_free_default(struct m_tag *); 349 350 extern int max_linkhdr; /* Largest link-level header */ 351 extern int max_protohdr; /* Size of largest protocol layer header. See user_mbuf.c */ 352 353 extern struct mbstat mbstat; /* General mbuf stats/infos */ 354 355 356 /* 357 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can 358 * be both the local data payload, or an external buffer area, depending on 359 * whether M_EXT is set). 360 */ 361 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \ 362 (!(((m)->m_flags & M_EXT)) || \ 363 (*((m)->m_ext.ref_cnt) == 1)) ) \ 364 365 366 /* 367 * Compute the amount of space available before the current start of data in 368 * an mbuf. 369 * 370 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 371 * of checking writability of the mbuf data area rests solely with the caller. 372 */ 373 #define M_LEADINGSPACE(m) \ 374 ((m)->m_flags & M_EXT ? \ 375 (M_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \ 376 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ 377 (m)->m_data - (m)->m_dat) 378 379 /* 380 * Compute the amount of space available after the end of data in an mbuf. 381 * 382 * The M_WRITABLE() is a temporary, conservative safety measure: the burden 383 * of checking writability of the mbuf data area rests solely with the caller. 384 */ 385 #define M_TRAILINGSPACE(m) \ 386 ((m)->m_flags & M_EXT ? \ 387 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \ 388 - ((m)->m_data + (m)->m_len) : 0) : \ 389 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) 390 391 392 393 /* 394 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be 395 * allocated, how specifies whether to wait. If the allocation fails, the 396 * original mbuf chain is freed and m is set to NULL. 397 */ 398 #define M_PREPEND(m, plen, how) do { \ 399 struct mbuf **_mmp = &(m); \ 400 struct mbuf *_mm = *_mmp; \ 401 int _mplen = (plen); \ 402 int __mhow = (how); \ 403 \ 404 if (M_LEADINGSPACE(_mm) >= _mplen) { \ 405 _mm->m_data -= _mplen; \ 406 _mm->m_len += _mplen; \ 407 } else \ 408 _mm = m_prepend(_mm, _mplen, __mhow); \ 409 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ 410 _mm->m_pkthdr.len += _mplen; \ 411 *_mmp = _mm; \ 412 } while (0) 413 414 /* 415 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place an 416 * object of the specified size at the end of the mbuf, longword aligned. 417 */ 418 #define M_ALIGN(m, len) do { \ 419 KASSERT(!((m)->m_flags & (M_PKTHDR|M_EXT)), \ 420 ("%s: M_ALIGN not normal mbuf", __func__)); \ 421 KASSERT((m)->m_data == (m)->m_dat, \ 422 ("%s: M_ALIGN not a virgin mbuf", __func__)); \ 423 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ 424 } while (0) 425 426 /* 427 * As above, for mbufs allocated with m_gethdr/MGETHDR or initialized by 428 * M_DUP/MOVE_PKTHDR. 429 */ 430 #define MH_ALIGN(m, len) do { \ 431 KASSERT((m)->m_flags & M_PKTHDR && !((m)->m_flags & M_EXT), \ 432 ("%s: MH_ALIGN not PKTHDR mbuf", __func__)); \ 433 KASSERT((m)->m_data == (m)->m_pktdat, \ 434 ("%s: MH_ALIGN not a virgin mbuf", __func__)); \ 435 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ 436 } while (0) 437 438 #endif 439