1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010 Luigi Rizzo, Riccardo Panicucci, Universita` di Pisa 5 * All rights reserved 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * internal dummynet APIs. 31 */ 32 33 #ifndef _IP_DN_PRIVATE_H 34 #define _IP_DN_PRIVATE_H 35 36 /* debugging support 37 * use ND() to remove debugging, D() to print a line, 38 * DX(level, ...) to print above a certain level 39 * If you redefine D() you are expected to redefine all. 40 */ 41 #ifndef D 42 #define ND(fmt, ...) do {} while (0) 43 #define D1(fmt, ...) do {} while (0) 44 #define D(fmt, ...) printf("%-10s " fmt "\n", \ 45 __FUNCTION__, ## __VA_ARGS__) 46 #define DX(lev, fmt, ...) do { \ 47 if (V_dn_cfg.debug > lev) D(fmt, ## __VA_ARGS__); } while (0) 48 #endif 49 50 MALLOC_DECLARE(M_DUMMYNET); 51 52 #ifndef __linux__ 53 #define div64(a, b) ((int64_t)(a) / (int64_t)(b)) 54 #endif 55 56 #define DN_LOCK_INIT() do { \ 57 mtx_init(&V_dn_cfg.uh_mtx, "dn_uh", NULL, MTX_DEF); \ 58 mtx_init(&V_dn_cfg.bh_mtx, "dn_bh", NULL, MTX_DEF); \ 59 } while (0) 60 #define DN_LOCK_DESTROY() do { \ 61 mtx_destroy(&V_dn_cfg.uh_mtx); \ 62 mtx_destroy(&V_dn_cfg.bh_mtx); \ 63 } while (0) 64 #if 0 /* not used yet */ 65 #define DN_UH_RLOCK() mtx_lock(&V_dn_cfg.uh_mtx) 66 #define DN_UH_RUNLOCK() mtx_unlock(&V_dn_cfg.uh_mtx) 67 #define DN_UH_WLOCK() mtx_lock(&V_dn_cfg.uh_mtx) 68 #define DN_UH_WUNLOCK() mtx_unlock(&V_dn_cfg.uh_mtx) 69 #define DN_UH_LOCK_ASSERT() mtx_assert(&V_dn_cfg.uh_mtx, MA_OWNED) 70 #endif 71 72 #define DN_BH_RLOCK() mtx_lock(&V_dn_cfg.uh_mtx) 73 #define DN_BH_RUNLOCK() mtx_unlock(&V_dn_cfg.uh_mtx) 74 #define DN_BH_WLOCK() mtx_lock(&V_dn_cfg.uh_mtx) 75 #define DN_BH_WUNLOCK() mtx_unlock(&V_dn_cfg.uh_mtx) 76 #define DN_BH_LOCK_ASSERT() mtx_assert(&V_dn_cfg.uh_mtx, MA_OWNED) 77 78 SLIST_HEAD(dn_fsk_head, dn_fsk); 79 80 struct mq { /* a basic queue of packets*/ 81 struct mbuf *head, *tail; 82 int count; 83 }; 84 85 static inline void 86 set_oid(struct dn_id *o, int type, int len) 87 { 88 o->type = type; 89 o->len = len; 90 o->subtype = 0; 91 } 92 93 /* 94 * configuration and data for a dummynet instance 95 * 96 * When a configuration is modified from userland, 'id' is incremented 97 * so we can use the value to check for stale pointers. 98 */ 99 struct dn_parms { 100 uint32_t id; /* configuration version */ 101 102 /* defaults (sysctl-accessible) */ 103 int red_lookup_depth; 104 int red_avg_pkt_size; 105 int red_max_pkt_size; 106 int hash_size; 107 int max_hash_size; 108 long byte_limit; /* max queue sizes */ 109 long slot_limit; 110 111 int io_fast; 112 int debug; 113 114 /* timekeeping */ 115 struct timeval prev_t; /* last time dummynet_tick ran */ 116 struct dn_heap evheap; /* scheduled events */ 117 118 long tick_last; /* Last tick duration (usec). */ 119 long tick_delta; /* Last vs standard tick diff (usec). */ 120 long tick_delta_sum; /* Accumulated tick difference (usec).*/ 121 long tick_adjustment; /* Tick adjustments done. */ 122 long tick_lost; /* Lost(coalesced) ticks number. */ 123 /* Adjusted vs non-adjusted curr_time difference (ticks). */ 124 long tick_diff; 125 126 /* counters of objects -- used for reporting space */ 127 int schk_count; 128 int si_count; 129 int fsk_count; 130 int queue_count; 131 132 /* packet counters */ 133 unsigned long io_pkt; 134 unsigned long io_pkt_fast; 135 unsigned long io_pkt_drop; 136 137 /* ticks and other stuff */ 138 uint64_t curr_time; 139 /* flowsets and schedulers are in hash tables, with 'hash_size' 140 * buckets. fshash is looked up at every packet arrival 141 * so better be generous if we expect many entries. 142 */ 143 struct dn_ht *fshash; 144 struct dn_ht *schedhash; 145 /* list of flowsets without a scheduler -- use sch_chain */ 146 struct dn_fsk_head fsu; /* list of unlinked flowsets */ 147 148 /* Store the fs/sch to scan when draining. The value is the 149 * bucket number of the hash table. Expire can be disabled 150 * with net.inet.ip.dummynet.expire=0, or it happens every 151 * expire ticks. 152 **/ 153 int drain_fs; 154 int drain_sch; 155 uint32_t expire; 156 uint32_t expire_cycle; /* tick count */ 157 158 int init_done; 159 160 #ifdef _KERNEL 161 /* 162 * This file is normally used in the kernel, unless we do 163 * some userland tests, in which case we do not need a mtx. 164 * uh_mtx arbitrates between system calls and also 165 * protects fshash, schedhash and fsunlinked. 166 * These structures are readonly for the lower half. 167 * bh_mtx protects all other structures which may be 168 * modified upon packet arrivals 169 */ 170 #if defined( __linux__ ) || defined( _WIN32 ) 171 spinlock_t uh_mtx; 172 spinlock_t bh_mtx; 173 #else 174 struct mtx uh_mtx; 175 struct mtx bh_mtx; 176 #endif 177 178 #endif /* _KERNEL */ 179 }; 180 181 /* 182 * Delay line, contains all packets on output from a link. 183 * Every scheduler instance has one. 184 */ 185 struct delay_line { 186 struct dn_id oid; 187 struct dn_sch_inst *si; 188 struct mq mq; 189 }; 190 191 /* 192 * The kernel side of a flowset. It is linked in a hash table 193 * of flowsets, and in a list of children of their parent scheduler. 194 * qht is either the queue or (if HAVE_MASK) a hash table queues. 195 * Note that the mask to use is the (flow_mask|sched_mask), which 196 * changes as we attach/detach schedulers. So we store it here. 197 * 198 * XXX If we want to add scheduler-specific parameters, we need to 199 * put them in external storage because the scheduler may not be 200 * available when the fsk is created. 201 */ 202 struct dn_fsk { /* kernel side of a flowset */ 203 struct dn_fs fs; 204 SLIST_ENTRY(dn_fsk) fsk_next; /* hash chain for fshash */ 205 206 struct ipfw_flow_id fsk_mask; 207 208 /* qht is a hash table of queues, or just a single queue 209 * a bit in fs.flags tells us which one 210 */ 211 struct dn_ht *qht; 212 struct dn_schk *sched; /* Sched we are linked to */ 213 SLIST_ENTRY(dn_fsk) sch_chain; /* list of fsk attached to sched */ 214 215 /* bucket index used by drain routine to drain queues for this 216 * flowset 217 */ 218 int drain_bucket; 219 /* Parameter realted to RED / GRED */ 220 /* original values are in dn_fs*/ 221 int w_q ; /* queue weight (scaled) */ 222 int max_th ; /* maximum threshold for queue (scaled) */ 223 int min_th ; /* minimum threshold for queue (scaled) */ 224 int max_p ; /* maximum value for p_b (scaled) */ 225 226 u_int c_1 ; /* max_p/(max_th-min_th) (scaled) */ 227 u_int c_2 ; /* max_p*min_th/(max_th-min_th) (scaled) */ 228 u_int c_3 ; /* for GRED, (1-max_p)/max_th (scaled) */ 229 u_int c_4 ; /* for GRED, 1 - 2*max_p (scaled) */ 230 u_int * w_q_lookup ; /* lookup table for computing (1-w_q)^t */ 231 u_int lookup_depth ; /* depth of lookup table */ 232 int lookup_step ; /* granularity inside the lookup table */ 233 int lookup_weight ; /* equal to (1-w_q)^t / (1-w_q)^(t+1) */ 234 int avg_pkt_size ; /* medium packet size */ 235 int max_pkt_size ; /* max packet size */ 236 #ifdef NEW_AQM 237 struct dn_aqm *aqmfp; /* Pointer to AQM functions */ 238 void *aqmcfg; /* configuration parameters for AQM */ 239 #endif 240 }; 241 242 /* 243 * A queue is created as a child of a flowset unless it belongs to 244 * a !MULTIQUEUE scheduler. It is normally in a hash table in the 245 * flowset. fs always points to the parent flowset. 246 * si normally points to the sch_inst, unless the flowset has been 247 * detached from the scheduler -- in this case si == NULL and we 248 * should not enqueue. 249 */ 250 struct dn_queue { 251 struct dn_flow ni; /* oid, flow_id, stats */ 252 struct mq mq; /* packets queue */ 253 struct dn_sch_inst *_si; /* owner scheduler instance */ 254 SLIST_ENTRY(dn_queue) q_next; /* hash chain list for qht */ 255 struct dn_fsk *fs; /* parent flowset. */ 256 257 /* RED parameters */ 258 int avg; /* average queue length est. (scaled) */ 259 int count; /* arrivals since last RED drop */ 260 int random; /* random value (scaled) */ 261 uint64_t q_time; /* start of queue idle time */ 262 #ifdef NEW_AQM 263 void *aqm_status; /* per-queue status variables*/ 264 #endif 265 266 }; 267 268 /* 269 * The kernel side of a scheduler. Contains the userland config, 270 * a link, pointer to extra config arguments from command line, 271 * kernel flags, and a pointer to the scheduler methods. 272 * It is stored in a hash table, and holds a list of all 273 * flowsets and scheduler instances. 274 * XXX sch must be at the beginning, see schk_hash(). 275 */ 276 struct dn_schk { 277 struct dn_sch sch; 278 struct dn_alg *fp; /* Pointer to scheduler functions */ 279 struct dn_link link; /* The link, embedded */ 280 struct dn_profile *profile; /* delay profile, if any */ 281 struct dn_id *cfg; /* extra config arguments */ 282 283 SLIST_ENTRY(dn_schk) schk_next; /* hash chain for schedhash */ 284 285 struct dn_fsk_head fsk_list; /* all fsk linked to me */ 286 struct dn_fsk *fs; /* Flowset for !MULTIQUEUE */ 287 288 /* bucket index used by the drain routine to drain the scheduler 289 * instance for this flowset. 290 */ 291 int drain_bucket; 292 293 /* Hash table of all instances (through sch.sched_mask) 294 * or single instance if no mask. Always valid. 295 */ 296 struct dn_ht *siht; 297 }; 298 299 /* 300 * Scheduler instance. 301 * Contains variables and all queues relative to a this instance. 302 * This struct is created a runtime. 303 */ 304 struct dn_sch_inst { 305 struct dn_flow ni; /* oid, flowid and stats */ 306 SLIST_ENTRY(dn_sch_inst) si_next; /* hash chain for siht */ 307 struct delay_line dline; 308 struct dn_schk *sched; /* the template */ 309 int kflags; /* DN_ACTIVE */ 310 311 int64_t credit; /* bits I can transmit (more or less). */ 312 uint64_t sched_time; /* time link was scheduled in ready_heap */ 313 uint64_t idle_time; /* start of scheduler instance idle time */ 314 315 /* q_count is the number of queues that this instance is using. 316 * The counter is incremented or decremented when 317 * a reference from the queue is created or deleted. 318 * It is used to make sure that a scheduler instance can be safely 319 * deleted by the drain routine. See notes below. 320 */ 321 int q_count; 322 323 }; 324 325 /* 326 * NOTE about object drain. 327 * The system will automatically (XXX check when) drain queues and 328 * scheduler instances when they are idle. 329 * A queue is idle when it has no packets; an instance is idle when 330 * it is not in the evheap heap, and the corresponding delay line is empty. 331 * A queue can be safely deleted when it is idle because of the scheduler 332 * function xxx_free_queue() will remove any references to it. 333 * An instance can be only deleted when no queues reference it. To be sure 334 * of that, a counter (q_count) stores the number of queues that are pointing 335 * to the instance. 336 * 337 * XXX 338 * Order of scan: 339 * - take all flowset in a bucket for the flowset hash table 340 * - take all queues in a bucket for the flowset 341 * - increment the queue bucket 342 * - scan next flowset bucket 343 * Nothing is done if a bucket contains no entries. 344 * 345 * The same schema is used for sceduler instances 346 */ 347 348 /* kernel-side flags. Linux has DN_DELETE in fcntl.h 349 */ 350 enum { 351 /* 1 and 2 are reserved for the SCAN flags */ 352 DN_DESTROY = 0x0004, /* destroy */ 353 DN_DELETE_FS = 0x0008, /* destroy flowset */ 354 DN_DETACH = 0x0010, 355 DN_ACTIVE = 0x0020, /* object is in evheap */ 356 DN_F_DLINE = 0x0040, /* object is a delay line */ 357 DN_DEL_SAFE = 0x0080, /* delete a queue only if no longer needed 358 * by scheduler */ 359 DN_QHT_IS_Q = 0x0100, /* in flowset, qht is a single queue */ 360 }; 361 362 /* 363 * Packets processed by dummynet have an mbuf tag associated with 364 * them that carries their dummynet state. 365 * Outside dummynet, only the 'rule' field is relevant, and it must 366 * be at the beginning of the structure. 367 */ 368 struct dn_pkt_tag { 369 struct ipfw_rule_ref rule; /* matching rule */ 370 371 /* second part, dummynet specific */ 372 int dn_dir; /* action when packet comes out.*/ 373 /* see ip_fw_private.h */ 374 uint64_t output_time; /* when the pkt is due for delivery*/ 375 uint16_t if_index; 376 uint16_t if_idxgen; 377 uint16_t iphdr_off; /* IP header offset for mtodo() */ 378 }; 379 380 /* 381 * Possible values for dn_dir. XXXGL: this needs to be reviewed 382 * and converted to same values ip_fw_args.flags use. 383 */ 384 enum { 385 DIR_OUT = 0, 386 DIR_IN = 1, 387 DIR_FWD = 2, 388 DIR_DROP = 3, 389 PROTO_LAYER2 = 0x4, /* set for layer 2 */ 390 PROTO_IPV4 = 0x08, 391 PROTO_IPV6 = 0x10, 392 PROTO_IFB = 0x0c, /* layer2 + ifbridge */ 393 }; 394 395 //extern struct dn_parms V_dn_cfg; 396 VNET_DECLARE(struct dn_parms, dn_cfg); 397 #define V_dn_cfg VNET(dn_cfg) 398 399 int dummynet_io(struct mbuf **, struct ip_fw_args *); 400 void dummynet_sched_lock(void); 401 void dummynet_sched_unlock(void); 402 void dummynet_task(void *context, int pending); 403 void dn_reschedule(void); 404 struct dn_pkt_tag * dn_tag_get(struct mbuf *m); 405 406 struct dn_queue *ipdn_q_find(struct dn_fsk *, struct dn_sch_inst *, 407 struct ipfw_flow_id *); 408 struct dn_sch_inst *ipdn_si_find(struct dn_schk *, struct ipfw_flow_id *); 409 410 /* 411 * copy_range is a template for requests for ranges of pipes/queues/scheds. 412 * The number of ranges is variable and can be derived by o.len. 413 * As a default, we use a small number of entries so that the struct 414 * fits easily on the stack and is sufficient for most common requests. 415 */ 416 #define DEFAULT_RANGES 5 417 struct copy_range { 418 struct dn_id o; 419 uint32_t r[ 2 * DEFAULT_RANGES ]; 420 }; 421 422 struct copy_args { 423 char **start; 424 char *end; 425 int flags; 426 int type; 427 struct copy_range *extra; /* extra filtering */ 428 }; 429 430 struct sockopt; 431 int ip_dummynet_compat(struct sockopt *sopt); 432 int dummynet_get(struct sockopt *sopt, void **compat); 433 int dn_c_copy_q (void *_ni, void *arg); 434 int dn_c_copy_pipe(struct dn_schk *s, struct copy_args *a, int nq); 435 int dn_c_copy_fs(struct dn_fsk *f, struct copy_args *a, int nq); 436 int dn_compat_copy_queue(struct copy_args *a, void *_o); 437 int dn_compat_copy_pipe(struct copy_args *a, void *_o); 438 int copy_data_helper_compat(void *_o, void *_arg); 439 int dn_compat_calc_size(void); 440 int do_config(void *p, size_t l); 441 442 /* function to drain idle object */ 443 void dn_drain_scheduler(void); 444 void dn_drain_queue(void); 445 446 #ifdef NEW_AQM 447 int ecn_mark(struct mbuf* m); 448 449 /* moved from ip_dn_io.c to here to be available for AQMs modules*/ 450 static inline void 451 mq_append(struct mq *q, struct mbuf *m) 452 { 453 #ifdef USERSPACE 454 // buffers from netmap need to be copied 455 // XXX note that the routine is not expected to fail 456 ND("append %p to %p", m, q); 457 if (m->m_flags & M_STACK) { 458 struct mbuf *m_new; 459 void *p; 460 int l, ofs; 461 462 ofs = m->m_data - m->__m_extbuf; 463 // XXX allocate 464 MGETHDR(m_new, M_NOWAIT, MT_DATA); 465 ND("*** WARNING, volatile buf %p ext %p %d dofs %d m_new %p", 466 m, m->__m_extbuf, m->__m_extlen, ofs, m_new); 467 p = m_new->__m_extbuf; /* new pointer */ 468 l = m_new->__m_extlen; /* new len */ 469 if (l <= m->__m_extlen) { 470 panic("extlen too large"); 471 } 472 473 *m_new = *m; // copy 474 m_new->m_flags &= ~M_STACK; 475 m_new->__m_extbuf = p; // point to new buffer 476 _pkt_copy(m->__m_extbuf, p, m->__m_extlen); 477 m_new->m_data = p + ofs; 478 m = m_new; 479 } 480 #endif /* USERSPACE */ 481 if (q->head == NULL) 482 q->head = m; 483 else 484 q->tail->m_nextpkt = m; 485 q->count++; 486 q->tail = m; 487 m->m_nextpkt = NULL; 488 } 489 #endif /* NEW_AQM */ 490 491 #endif /* _IP_DN_PRIVATE_H */ 492