sys/net/flowtable.c

   1 /**************************************************************************
   2
   3 Copyright (c) 2008-2010, BitGravity Inc.
   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 are met:
   8
   9  1. Redistributions of source code must retain the above copyright notice,
  10     this list of conditions and the following disclaimer.
  11
  12  2. Neither the name of the BitGravity Corporation nor the names of its
  13     contributors may be used to endorse or promote products derived from
  14     this software without specific prior written permission.
  15
  16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17 AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
  20 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26 POSSIBILITY OF SUCH DAMAGE.
  27
  28 ***************************************************************************/
  29
  30 #include "opt_route.h"
  31 #include "opt_mpath.h"
  32 #include "opt_ddb.h"
  33 #include "opt_inet.h"
  34 #include "opt_inet6.h"
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/param.h>
  40 #include <sys/types.h>
  41 #include <sys/bitstring.h>
  42 #include <sys/condvar.h>
  43 #include <sys/callout.h>
  44 #include <sys/hash.h>
  45 #include <sys/kernel.h>
  46 #include <sys/kthread.h>
  47 #include <sys/limits.h>
  48 #include <sys/malloc.h>
  49 #include <sys/mbuf.h>
  50 #include <sys/proc.h>
  51 #include <sys/sbuf.h>
  52 #include <sys/sched.h>
  53 #include <sys/smp.h>
  54 #include <sys/socket.h>
  55 #include <sys/syslog.h>
  56 #include <sys/sysctl.h>
  57
  58 #include <net/if.h>
  59 #include <net/if_llatbl.h>
  60 #include <net/if_var.h>
  61 #include <net/route.h>
  62 #include <net/flowtable.h>
  63 #include <net/vnet.h>
  64
  65 #include <netinet/in.h>
  66 #include <netinet/in_systm.h>
  67 #include <netinet/in_var.h>
  68 #include <netinet/if_ether.h>
  69 #include <netinet/ip.h>
  70 #ifdef INET6
  71 #include <netinet/ip6.h>
  72 #endif
  73 #include <netinet/tcp.h>
  74 #include <netinet/udp.h>
  75 #include <netinet/sctp.h>
  76
  77 #include <ddb/ddb.h>
  78
  79 struct ipv4_tuple {
  80         uint16_t        ip_sport;       /* source port */
  81         uint16_t        ip_dport;       /* destination port */
  82         in_addr_t       ip_saddr;       /* source address */
  83         in_addr_t       ip_daddr;       /* destination address */
  84 };
  85
  86 union ipv4_flow {
  87         struct ipv4_tuple ipf_ipt;
  88         uint32_t        ipf_key[3];
  89 };
  90
  91 struct ipv6_tuple {
  92         uint16_t        ip_sport;       /* source port */
  93         uint16_t        ip_dport;       /* destination port */
  94         struct in6_addr ip_saddr;       /* source address */
  95         struct in6_addr ip_daddr;       /* destination address */
  96 };
  97
  98 union ipv6_flow {
  99         struct ipv6_tuple ipf_ipt;
 100         uint32_t        ipf_key[9];
 101 };
 102
 103 struct flentry {
 104         volatile uint32_t       f_fhash;        /* hash flowing forward */
 105         uint16_t                f_flags;        /* flow flags */
 106         uint8_t                 f_pad;
 107         uint8_t                 f_proto;        /* protocol */
 108         uint32_t                f_fibnum;       /* fib index */
 109         uint32_t                f_uptime;       /* uptime at last access */
 110         struct flentry          *f_next;        /* pointer to collision entry */
 111         volatile struct rtentry *f_rt;          /* rtentry for flow */
 112         volatile struct llentry *f_lle;         /* llentry for flow */
 113 };
 114
 115 struct flentry_v4 {
 116         struct flentry  fl_entry;
 117         union ipv4_flow fl_flow;
 118 };
 119
 120 struct flentry_v6 {
 121         struct flentry  fl_entry;
 122         union ipv6_flow fl_flow;
 123 };
 124
 125 #define fl_fhash        fl_entry.fl_fhash
 126 #define fl_flags        fl_entry.fl_flags
 127 #define fl_proto        fl_entry.fl_proto
 128 #define fl_uptime       fl_entry.fl_uptime
 129 #define fl_rt           fl_entry.fl_rt
 130 #define fl_lle          fl_entry.fl_lle
 131
 132 #define SECS_PER_HOUR           3600
 133 #define SECS_PER_DAY            (24*SECS_PER_HOUR)
 134
 135 #define SYN_IDLE                300
 136 #define UDP_IDLE                300
 137 #define FIN_WAIT_IDLE           600
 138 #define TCP_IDLE                SECS_PER_DAY
 139
 140
 141 typedef void fl_lock_t(struct flowtable *, uint32_t);
 142 typedef void fl_rtalloc_t(struct route *, uint32_t, u_int);
 143
 144 union flentryp {
 145         struct flentry          **global;
 146         struct flentry          **pcpu[MAXCPU];
 147 };
 148
 149 struct flowtable_stats {
 150         uint64_t        ft_collisions;
 151         uint64_t        ft_allocated;
 152         uint64_t        ft_misses;
 153         uint64_t        ft_max_depth;
 154         uint64_t        ft_free_checks;
 155         uint64_t        ft_frees;
 156         uint64_t        ft_hits;
 157         uint64_t        ft_lookups;
 158 } __aligned(CACHE_LINE_SIZE);
 159
 160 struct flowtable {
 161         struct  flowtable_stats ft_stats[MAXCPU];
 162         int             ft_size;
 163         int             ft_lock_count;
 164         uint32_t        ft_flags;
 165         char            *ft_name;
 166         fl_lock_t       *ft_lock;
 167         fl_lock_t       *ft_unlock;
 168         fl_rtalloc_t    *ft_rtalloc;
 169         /*
 170          * XXX need to pad out
 171          */
 172         struct mtx      *ft_locks;
 173         union flentryp  ft_table;
 174         bitstr_t        *ft_masks[MAXCPU];
 175         bitstr_t        *ft_tmpmask;
 176         struct flowtable *ft_next;
 177
 178         uint32_t        ft_count __aligned(CACHE_LINE_SIZE);
 179         uint32_t        ft_udp_idle __aligned(CACHE_LINE_SIZE);
 180         uint32_t        ft_fin_wait_idle;
 181         uint32_t        ft_syn_idle;
 182         uint32_t        ft_tcp_idle;
 183         boolean_t       ft_full;
 184 } __aligned(CACHE_LINE_SIZE);
 185
 186 static struct proc *flowcleanerproc;
 187 static VNET_DEFINE(struct flowtable *, flow_list_head);
 188 static VNET_DEFINE(uint32_t, flow_hashjitter);
 189 static VNET_DEFINE(uma_zone_t, flow_ipv4_zone);
 190 static VNET_DEFINE(uma_zone_t, flow_ipv6_zone);
 191
 192 #define V_flow_list_head        VNET(flow_list_head)
 193 #define V_flow_hashjitter       VNET(flow_hashjitter)
 194 #define V_flow_ipv4_zone        VNET(flow_ipv4_zone)
 195 #define V_flow_ipv6_zone        VNET(flow_ipv6_zone)
 196
 197
 198 static struct cv        flowclean_f_cv;
 199 static struct cv        flowclean_c_cv;
 200 static struct mtx       flowclean_lock;
 201 static uint32_t         flowclean_cycles;
 202 static uint32_t         flowclean_freq;
 203
 204 #ifdef FLOWTABLE_DEBUG
 205 #define FLDPRINTF(ft, flags, fmt, ...)          \
 206 do {                                            \
 207         if ((ft)->ft_flags & (flags))           \
 208                 printf((fmt), __VA_ARGS__);     \
 209 } while (0);                                    \
 210
 211 #else
 212 #define FLDPRINTF(ft, flags, fmt, ...)
 213
 214 #endif
 215
 216
 217 /*
 218  * TODO:
 219  * - Make flowtable stats per-cpu, aggregated at sysctl call time,
 220  *   to avoid extra cache evictions caused by incrementing a shared
 221  *   counter
 222  * - add sysctls to resize && flush flow tables
 223  * - Add per flowtable sysctls for statistics and configuring timeouts
 224  * - add saturation counter to rtentry to support per-packet load-balancing
 225  *   add flag to indicate round-robin flow, add list lookup from head
 226      for flows
 227  * - add sysctl / device node / syscall to support exporting and importing
 228  *   of flows with flag to indicate that a flow was imported so should
 229  *   not be considered for auto-cleaning
 230  * - support explicit connection state (currently only ad-hoc for DSR)
 231  * - idetach() cleanup for options VIMAGE builds.
 232  */
 233 VNET_DEFINE(int, flowtable_enable) = 1;
 234 static VNET_DEFINE(int, flowtable_debug);
 235 static VNET_DEFINE(int, flowtable_syn_expire) = SYN_IDLE;
 236 static VNET_DEFINE(int, flowtable_udp_expire) = UDP_IDLE;
 237 static VNET_DEFINE(int, flowtable_fin_wait_expire) = FIN_WAIT_IDLE;
 238 static VNET_DEFINE(int, flowtable_tcp_expire) = TCP_IDLE;
 239 static VNET_DEFINE(int, flowtable_nmbflows);
 240 static VNET_DEFINE(int, flowtable_ready) = 0;
 241
 242 #define V_flowtable_enable              VNET(flowtable_enable)
 243 #define V_flowtable_debug               VNET(flowtable_debug)
 244 #define V_flowtable_syn_expire          VNET(flowtable_syn_expire)
 245 #define V_flowtable_udp_expire          VNET(flowtable_udp_expire)
 246 #define V_flowtable_fin_wait_expire     VNET(flowtable_fin_wait_expire)
 247 #define V_flowtable_tcp_expire          VNET(flowtable_tcp_expire)
 248 #define V_flowtable_nmbflows            VNET(flowtable_nmbflows)
 249 #define V_flowtable_ready               VNET(flowtable_ready)
 250
 251 static SYSCTL_NODE(_net_inet, OID_AUTO, flowtable, CTLFLAG_RD, NULL,
 252     "flowtable");
 253 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, debug, CTLFLAG_RW,
 254     &VNET_NAME(flowtable_debug), 0, "print debug info.");
 255 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, enable, CTLFLAG_RW,
 256     &VNET_NAME(flowtable_enable), 0, "enable flowtable caching.");
 257
 258 /*
 259  * XXX This does not end up updating timeouts at runtime
 260  * and only reflects the value for the last table added :-/
 261  */
 262 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, syn_expire, CTLFLAG_RW,
 263     &VNET_NAME(flowtable_syn_expire), 0,
 264     "seconds after which to remove syn allocated flow.");
 265 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, udp_expire, CTLFLAG_RW,
 266     &VNET_NAME(flowtable_udp_expire), 0,
 267     "seconds after which to remove flow allocated to UDP.");
 268 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, fin_wait_expire, CTLFLAG_RW,
 269     &VNET_NAME(flowtable_fin_wait_expire), 0,
 270     "seconds after which to remove a flow in FIN_WAIT.");
 271 SYSCTL_VNET_INT(_net_inet_flowtable, OID_AUTO, tcp_expire, CTLFLAG_RW,
 272     &VNET_NAME(flowtable_tcp_expire), 0,
 273     "seconds after which to remove flow allocated to a TCP connection.");
 274
 275
 276 /*
 277  * Maximum number of flows that can be allocated of a given type.
 278  *
 279  * The table is allocated at boot time (for the pure caching case
 280  * there is no reason why this could not be changed at runtime)
 281  * and thus (currently) needs to be set with a tunable.
 282  */
 283 static int
 284 sysctl_nmbflows(SYSCTL_HANDLER_ARGS)
 285 {
 286         int error, newnmbflows;
 287
 288         newnmbflows = V_flowtable_nmbflows;
 289         error = sysctl_handle_int(oidp, &newnmbflows, 0, req);
 290         if (error == 0 && req->newptr) {
 291                 if (newnmbflows > V_flowtable_nmbflows) {
 292                         V_flowtable_nmbflows = newnmbflows;
 293                         uma_zone_set_max(V_flow_ipv4_zone,
 294                             V_flowtable_nmbflows);
 295                         uma_zone_set_max(V_flow_ipv6_zone,
 296                             V_flowtable_nmbflows);
 297                 } else
 298                         error = EINVAL;
 299         }
 300         return (error);
 301 }
 302 SYSCTL_VNET_PROC(_net_inet_flowtable, OID_AUTO, nmbflows,
 303     CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_nmbflows, "IU",
 304     "Maximum number of flows allowed");
 305
 306
 307
 308 #define FS_PRINT(sb, field)     sbuf_printf((sb), "\t%s: %jd\n", #field, fs->ft_##field)
 309
 310 static void
 311 fs_print(struct sbuf *sb, struct flowtable_stats *fs)
 312 {
 313
 314         FS_PRINT(sb, collisions);
 315         FS_PRINT(sb, allocated);
 316         FS_PRINT(sb, misses);
 317         FS_PRINT(sb, max_depth);
 318         FS_PRINT(sb, free_checks);
 319         FS_PRINT(sb, frees);
 320         FS_PRINT(sb, hits);
 321         FS_PRINT(sb, lookups);
 322 }
 323
 324 static void
 325 flowtable_show_stats(struct sbuf *sb, struct flowtable *ft)
 326 {
 327         int i;
 328         struct flowtable_stats fs, *pfs;
 329
 330         if (ft->ft_flags & FL_PCPU) {
 331                 bzero(&fs, sizeof(fs));
 332                 pfs = &fs;
 333                 CPU_FOREACH(i) {
 334                         pfs->ft_collisions  += ft->ft_stats[i].ft_collisions;
 335                         pfs->ft_allocated   += ft->ft_stats[i].ft_allocated;
 336                         pfs->ft_misses      += ft->ft_stats[i].ft_misses;
 337                         pfs->ft_free_checks += ft->ft_stats[i].ft_free_checks;
 338                         pfs->ft_frees       += ft->ft_stats[i].ft_frees;
 339                         pfs->ft_hits        += ft->ft_stats[i].ft_hits;
 340                         pfs->ft_lookups     += ft->ft_stats[i].ft_lookups;
 341                         if (ft->ft_stats[i].ft_max_depth > pfs->ft_max_depth)
 342                                 pfs->ft_max_depth = ft->ft_stats[i].ft_max_depth;
 343                 }
 344         } else {
 345                 pfs = &ft->ft_stats[0];
 346         }
 347         fs_print(sb, pfs);
 348 }
 349
 350 static int
 351 sysctl_flowtable_stats(SYSCTL_HANDLER_ARGS)
 352 {
 353         struct flowtable *ft;
 354         struct sbuf *sb;
 355         int error;
 356
 357         sb = sbuf_new(NULL, NULL, 64*1024, SBUF_FIXEDLEN);
 358
 359         ft = V_flow_list_head;
 360         while (ft != NULL) {
 361                 sbuf_printf(sb, "\ntable name: %s\n", ft->ft_name);
 362                 flowtable_show_stats(sb, ft);
 363                 ft = ft->ft_next;
 364         }
 365         sbuf_finish(sb);
 366         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 367         sbuf_delete(sb);
 368
 369         return (error);
 370 }
 371 SYSCTL_VNET_PROC(_net_inet_flowtable, OID_AUTO, stats, CTLTYPE_STRING|CTLFLAG_RD,
 372     NULL, 0, sysctl_flowtable_stats, "A", "flowtable statistics");
 373
 374
 375 #ifndef RADIX_MPATH
 376 static void
 377 rtalloc_ign_wrapper(struct route *ro, uint32_t hash, u_int fibnum)
 378 {
 379
 380         rtalloc_ign_fib(ro, 0, fibnum);
 381 }
 382 #endif
 383
 384 static void
 385 flowtable_global_lock(struct flowtable *table, uint32_t hash)
 386 {
 387         int lock_index = (hash)&(table->ft_lock_count - 1);
 388
 389         mtx_lock(&table->ft_locks[lock_index]);
 390 }
 391
 392 static void
 393 flowtable_global_unlock(struct flowtable *table, uint32_t hash)
 394 {
 395         int lock_index = (hash)&(table->ft_lock_count - 1);
 396
 397         mtx_unlock(&table->ft_locks[lock_index]);
 398 }
 399
 400 static void
 401 flowtable_pcpu_lock(struct flowtable *table, uint32_t hash)
 402 {
 403
 404         critical_enter();
 405 }
 406
 407 static void
 408 flowtable_pcpu_unlock(struct flowtable *table, uint32_t hash)
 409 {
 410
 411         critical_exit();
 412 }
 413
 414 #define FL_ENTRY_INDEX(table, hash)((hash) % (table)->ft_size)
 415 #define FL_ENTRY(table, hash) *flowtable_entry((table), (hash))
 416 #define FL_ENTRY_LOCK(table, hash)  (table)->ft_lock((table), (hash))
 417 #define FL_ENTRY_UNLOCK(table, hash) (table)->ft_unlock((table), (hash))
 418
 419 #define FL_STALE        (1<<8)
 420 #define FL_OVERWRITE    (1<<10)
 421
 422 void
 423 flow_invalidate(struct flentry *fle)
 424 {
 425
 426         fle->f_flags |= FL_STALE;
 427 }
 428
 429 static __inline int
 430 proto_to_flags(uint8_t proto)
 431 {
 432         int flag;
 433
 434         switch (proto) {
 435         case IPPROTO_TCP:
 436                 flag = FL_TCP;
 437                 break;
 438         case IPPROTO_SCTP:
 439                 flag = FL_SCTP;
 440                 break;
 441         case IPPROTO_UDP:
 442                 flag = FL_UDP;
 443                 break;
 444         default:
 445                 flag = 0;
 446                 break;
 447         }
 448
 449         return (flag);
 450 }
 451
 452 static __inline int
 453 flags_to_proto(int flags)
 454 {
 455         int proto, protoflags;
 456
 457         protoflags = flags & (FL_TCP|FL_SCTP|FL_UDP);
 458         switch (protoflags) {
 459         case FL_TCP:
 460                 proto = IPPROTO_TCP;
 461                 break;
 462         case FL_SCTP:
 463                 proto = IPPROTO_SCTP;
 464                 break;
 465         case FL_UDP:
 466                 proto = IPPROTO_UDP;
 467                 break;
 468         default:
 469                 proto = 0;
 470                 break;
 471         }
 472         return (proto);
 473 }
 474
 475 #ifdef INET
 476 #ifdef FLOWTABLE_DEBUG
 477 static void
 478 ipv4_flow_print_tuple(int flags, int proto, struct sockaddr_in *ssin,
 479     struct sockaddr_in *dsin)
 480 {
 481         char saddr[4*sizeof "123"], daddr[4*sizeof "123"];
 482
 483         if (flags & FL_HASH_ALL) {
 484                 inet_ntoa_r(ssin->sin_addr, saddr);
 485                 inet_ntoa_r(dsin->sin_addr, daddr);
 486                 printf("proto=%d %s:%d->%s:%d\n",
 487                     proto, saddr, ntohs(ssin->sin_port), daddr,
 488                     ntohs(dsin->sin_port));
 489         } else {
 490                 inet_ntoa_r(*(struct in_addr *) &dsin->sin_addr, daddr);
 491                 printf("proto=%d %s\n", proto, daddr);
 492         }
 493
 494 }
 495 #endif
 496
 497 static int
 498 ipv4_mbuf_demarshal(struct flowtable *ft, struct mbuf *m,
 499     struct sockaddr_in *ssin, struct sockaddr_in *dsin, uint16_t *flags)
 500 {
 501         struct ip *ip;
 502         uint8_t proto;
 503         int iphlen;
 504         struct tcphdr *th;
 505         struct udphdr *uh;
 506         struct sctphdr *sh;
 507         uint16_t sport, dport;
 508
 509         proto = sport = dport = 0;
 510         ip = mtod(m, struct ip *);
 511         dsin->sin_family = AF_INET;
 512         dsin->sin_len = sizeof(*dsin);
 513         dsin->sin_addr = ip->ip_dst;
 514         ssin->sin_family = AF_INET;
 515         ssin->sin_len = sizeof(*ssin);
 516         ssin->sin_addr = ip->ip_src;
 517
 518         proto = ip->ip_p;
 519         if ((*flags & FL_HASH_ALL) == 0) {
 520                 FLDPRINTF(ft, FL_DEBUG_ALL, "skip port check flags=0x%x ",
 521                     *flags);
 522                 goto skipports;
 523         }
 524
 525         iphlen = ip->ip_hl << 2; /* XXX options? */
 526
 527         switch (proto) {
 528         case IPPROTO_TCP:
 529                 th = (struct tcphdr *)((caddr_t)ip + iphlen);
 530                 sport = th->th_sport;
 531                 dport = th->th_dport;
 532                 if ((*flags & FL_HASH_ALL) &&
 533                     (th->th_flags & (TH_RST|TH_FIN)))
 534                         *flags |= FL_STALE;
 535         break;
 536         case IPPROTO_UDP:
 537                 uh = (struct udphdr *)((caddr_t)ip + iphlen);
 538                 sport = uh->uh_sport;
 539                 dport = uh->uh_dport;
 540         break;
 541         case IPPROTO_SCTP:
 542                 sh = (struct sctphdr *)((caddr_t)ip + iphlen);
 543                 sport = sh->src_port;
 544                 dport = sh->dest_port;
 545         break;
 546         default:
 547                 FLDPRINTF(ft, FL_DEBUG_ALL, "proto=0x%x not supported\n", proto);
 548                 return (ENOTSUP);
 549                 /* no port - hence not a protocol we care about */
 550                 break;
 551
 552         }
 553
 554 skipports:
 555         *flags |= proto_to_flags(proto);
 556         ssin->sin_port = sport;
 557         dsin->sin_port = dport;
 558         return (0);
 559 }
 560
 561 static uint32_t
 562 ipv4_flow_lookup_hash_internal(
 563         struct sockaddr_in *ssin, struct sockaddr_in *dsin,
 564             uint32_t *key, uint16_t flags)
 565 {
 566         uint16_t sport, dport;
 567         uint8_t proto;
 568         int offset = 0;
 569
 570         if ((V_flowtable_enable == 0) || (V_flowtable_ready == 0))
 571                 return (0);
 572         proto = flags_to_proto(flags);
 573         sport = dport = key[2] = key[1] = key[0] = 0;
 574         if ((ssin != NULL) && (flags & FL_HASH_ALL)) {
 575                 key[1] = ssin->sin_addr.s_addr;
 576                 sport = ssin->sin_port;
 577         }
 578         if (dsin != NULL) {
 579                 key[2] = dsin->sin_addr.s_addr;
 580                 dport = dsin->sin_port;
 581         }
 582         if (flags & FL_HASH_ALL) {
 583                 ((uint16_t *)key)[0] = sport;
 584                 ((uint16_t *)key)[1] = dport;
 585         } else
 586                 offset = V_flow_hashjitter + proto;
 587
 588         return (jenkins_hash32(key, 3, offset));
 589 }
 590
 591 static struct flentry *
 592 flowtable_lookup_mbuf4(struct flowtable *ft, struct mbuf *m)
 593 {
 594         struct sockaddr_storage ssa, dsa;
 595         uint16_t flags;
 596         struct sockaddr_in *dsin, *ssin;
 597
 598         dsin = (struct sockaddr_in *)&dsa;
 599         ssin = (struct sockaddr_in *)&ssa;
 600         bzero(dsin, sizeof(*dsin));
 601         bzero(ssin, sizeof(*ssin));
 602         flags = ft->ft_flags;
 603         if (ipv4_mbuf_demarshal(ft, m, ssin, dsin, &flags) != 0)
 604                 return (NULL);
 605
 606         return (flowtable_lookup(ft, &ssa, &dsa, M_GETFIB(m), flags));
 607 }
 608
 609 void
 610 flow_to_route(struct flentry *fle, struct route *ro)
 611 {
 612         uint32_t *hashkey = NULL;
 613         struct sockaddr_in *sin;
 614
 615         sin = (struct sockaddr_in *)&ro->ro_dst;
 616         sin->sin_family = AF_INET;
 617         sin->sin_len = sizeof(*sin);
 618         hashkey = ((struct flentry_v4 *)fle)->fl_flow.ipf_key;
 619         sin->sin_addr.s_addr = hashkey[2];
 620         ro->ro_rt = __DEVOLATILE(struct rtentry *, fle->f_rt);
 621         ro->ro_lle = __DEVOLATILE(struct llentry *, fle->f_lle);
 622         ro->ro_flags |= RT_NORTREF;
 623 }
 624 #endif /* INET */
 625
 626 #ifdef INET6
 627 /*
 628  * PULLUP_TO(len, p, T) makes sure that len + sizeof(T) is contiguous,
 629  * then it sets p to point at the offset "len" in the mbuf. WARNING: the
 630  * pointer might become stale after other pullups (but we never use it
 631  * this way).
 632  */
 633 #define PULLUP_TO(_len, p, T)                                           \
 634 do {                                                                    \
 635         int x = (_len) + sizeof(T);                                     \
 636         if ((m)->m_len < x) {                                           \
 637                 goto receive_failed;                                    \
 638         }                                                               \
 639         p = (mtod(m, char *) + (_len));                                 \
 640 } while (0)
 641
 642 #define TCP(p)          ((struct tcphdr *)(p))
 643 #define SCTP(p)         ((struct sctphdr *)(p))
 644 #define UDP(p)          ((struct udphdr *)(p))
 645
 646 static int
 647 ipv6_mbuf_demarshal(struct flowtable *ft, struct mbuf *m,
 648     struct sockaddr_in6 *ssin6, struct sockaddr_in6 *dsin6, uint16_t *flags)
 649 {
 650         struct ip6_hdr *ip6;
 651         uint8_t proto;
 652         int hlen;
 653         uint16_t src_port, dst_port;
 654         u_short offset;
 655         void *ulp;
 656
 657         offset = hlen = src_port = dst_port = 0;
 658         ulp = NULL;
 659         ip6 = mtod(m, struct ip6_hdr *);
 660         hlen = sizeof(struct ip6_hdr);
 661         proto = ip6->ip6_nxt;
 662
 663         if ((*flags & FL_HASH_ALL) == 0)
 664                 goto skipports;
 665
 666         while (ulp == NULL) {
 667                 switch (proto) {
 668                 case IPPROTO_ICMPV6:
 669                 case IPPROTO_OSPFIGP:
 670                 case IPPROTO_PIM:
 671                 case IPPROTO_CARP:
 672                 case IPPROTO_ESP:
 673                 case IPPROTO_NONE:
 674                         ulp = ip6;
 675                         break;
 676                 case IPPROTO_TCP:
 677                         PULLUP_TO(hlen, ulp, struct tcphdr);
 678                         dst_port = TCP(ulp)->th_dport;
 679                         src_port = TCP(ulp)->th_sport;
 680                         if ((*flags & FL_HASH_ALL) &&
 681                             (TCP(ulp)->th_flags & (TH_RST|TH_FIN)))
 682                                 *flags |= FL_STALE;
 683                         break;
 684                 case IPPROTO_SCTP:
 685                         PULLUP_TO(hlen, ulp, struct sctphdr);
 686                         src_port = SCTP(ulp)->src_port;
 687                         dst_port = SCTP(ulp)->dest_port;
 688                         break;
 689                 case IPPROTO_UDP:
 690                         PULLUP_TO(hlen, ulp, struct udphdr);
 691                         dst_port = UDP(ulp)->uh_dport;
 692                         src_port = UDP(ulp)->uh_sport;
 693                         break;
 694                 case IPPROTO_HOPOPTS:   /* RFC 2460 */
 695                         PULLUP_TO(hlen, ulp, struct ip6_hbh);
 696                         hlen += (((struct ip6_hbh *)ulp)->ip6h_len + 1) << 3;
 697                         proto = ((struct ip6_hbh *)ulp)->ip6h_nxt;
 698                         ulp = NULL;
 699                         break;
 700                 case IPPROTO_ROUTING:   /* RFC 2460 */
 701                         PULLUP_TO(hlen, ulp, struct ip6_rthdr);
 702                         hlen += (((struct ip6_rthdr *)ulp)->ip6r_len + 1) << 3;
 703                         proto = ((struct ip6_rthdr *)ulp)->ip6r_nxt;
 704                         ulp = NULL;
 705                         break;
 706                 case IPPROTO_FRAGMENT:  /* RFC 2460 */
 707                         PULLUP_TO(hlen, ulp, struct ip6_frag);
 708                         hlen += sizeof (struct ip6_frag);
 709                         proto = ((struct ip6_frag *)ulp)->ip6f_nxt;
 710                         offset = ((struct ip6_frag *)ulp)->ip6f_offlg &
 711                             IP6F_OFF_MASK;
 712                         ulp = NULL;
 713                         break;
 714                 case IPPROTO_DSTOPTS:   /* RFC 2460 */
 715                         PULLUP_TO(hlen, ulp, struct ip6_hbh);
 716                         hlen += (((struct ip6_hbh *)ulp)->ip6h_len + 1) << 3;
 717                         proto = ((struct ip6_hbh *)ulp)->ip6h_nxt;
 718                         ulp = NULL;
 719                         break;
 720                 case IPPROTO_AH:        /* RFC 2402 */
 721                         PULLUP_TO(hlen, ulp, struct ip6_ext);
 722                         hlen += (((struct ip6_ext *)ulp)->ip6e_len + 2) << 2;
 723                         proto = ((struct ip6_ext *)ulp)->ip6e_nxt;
 724                         ulp = NULL;
 725                         break;
 726                 default:
 727                         PULLUP_TO(hlen, ulp, struct ip6_ext);
 728                         break;
 729                 }
 730         }
 731
 732         if (src_port == 0) {
 733         receive_failed:
 734                 return (ENOTSUP);
 735         }
 736
 737 skipports:
 738         dsin6->sin6_family = AF_INET6;
 739         dsin6->sin6_len = sizeof(*dsin6);
 740         dsin6->sin6_port = dst_port;
 741         memcpy(&dsin6->sin6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
 742
 743         ssin6->sin6_family = AF_INET6;
 744         ssin6->sin6_len = sizeof(*ssin6);
 745         ssin6->sin6_port = src_port;
 746         memcpy(&ssin6->sin6_addr, &ip6->ip6_src, sizeof(struct in6_addr));
 747         *flags |= proto_to_flags(proto);
 748
 749         return (0);
 750 }
 751
 752 #define zero_key(key)           \
 753 do {                            \
 754         key[0] = 0;             \
 755         key[1] = 0;             \
 756         key[2] = 0;             \
 757         key[3] = 0;             \
 758         key[4] = 0;             \
 759         key[5] = 0;             \
 760         key[6] = 0;             \
 761         key[7] = 0;             \
 762         key[8] = 0;             \
 763 } while (0)
 764
 765 static uint32_t
 766 ipv6_flow_lookup_hash_internal(
 767         struct sockaddr_in6 *ssin6, struct sockaddr_in6 *dsin6,
 768             uint32_t *key, uint16_t flags)
 769 {
 770         uint16_t sport, dport;
 771         uint8_t proto;
 772         int offset = 0;
 773
 774         if ((V_flowtable_enable == 0) || (V_flowtable_ready == 0))
 775                 return (0);
 776
 777         proto = flags_to_proto(flags);
 778         zero_key(key);
 779         sport = dport = 0;
 780         if (dsin6 != NULL) {
 781                 memcpy(&key[1], &dsin6->sin6_addr, sizeof(struct in6_addr));
 782                 dport = dsin6->sin6_port;
 783         }
 784         if ((ssin6 != NULL) && (flags & FL_HASH_ALL)) {
 785                 memcpy(&key[5], &ssin6->sin6_addr, sizeof(struct in6_addr));
 786                 sport = ssin6->sin6_port;
 787         }
 788         if (flags & FL_HASH_ALL) {
 789                 ((uint16_t *)key)[0] = sport;
 790                 ((uint16_t *)key)[1] = dport;
 791         } else
 792                 offset = V_flow_hashjitter + proto;
 793
 794         return (jenkins_hash32(key, 9, offset));
 795 }
 796
 797 static struct flentry *
 798 flowtable_lookup_mbuf6(struct flowtable *ft, struct mbuf *m)
 799 {
 800         struct sockaddr_storage ssa, dsa;
 801         struct sockaddr_in6 *dsin6, *ssin6;
 802         uint16_t flags;
 803
 804         dsin6 = (struct sockaddr_in6 *)&dsa;
 805         ssin6 = (struct sockaddr_in6 *)&ssa;
 806         bzero(dsin6, sizeof(*dsin6));
 807         bzero(ssin6, sizeof(*ssin6));
 808         flags = ft->ft_flags;
 809
 810         if (ipv6_mbuf_demarshal(ft, m, ssin6, dsin6, &flags) != 0)
 811                 return (NULL);
 812
 813         return (flowtable_lookup(ft, &ssa, &dsa, M_GETFIB(m), flags));
 814 }
 815
 816 void
 817 flow_to_route_in6(struct flentry *fle, struct route_in6 *ro)
 818 {
 819         uint32_t *hashkey = NULL;
 820         struct sockaddr_in6 *sin6;
 821
 822         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 823
 824         sin6->sin6_family = AF_INET6;
 825         sin6->sin6_len = sizeof(*sin6);
 826         hashkey = ((struct flentry_v6 *)fle)->fl_flow.ipf_key;
 827         memcpy(&sin6->sin6_addr, &hashkey[5], sizeof (struct in6_addr));
 828         ro->ro_rt = __DEVOLATILE(struct rtentry *, fle->f_rt);
 829         ro->ro_lle = __DEVOLATILE(struct llentry *, fle->f_lle);
 830         ro->ro_flags |= RT_NORTREF;
 831 }
 832 #endif /* INET6 */
 833
 834 static bitstr_t *
 835 flowtable_mask(struct flowtable *ft)
 836 {
 837         bitstr_t *mask;
 838
 839         if (ft->ft_flags & FL_PCPU)
 840                 mask = ft->ft_masks[curcpu];
 841         else
 842                 mask = ft->ft_masks[0];
 843
 844         return (mask);
 845 }
 846
 847 static struct flentry **
 848 flowtable_entry(struct flowtable *ft, uint32_t hash)
 849 {
 850         struct flentry **fle;
 851         int index = (hash % ft->ft_size);
 852
 853         if (ft->ft_flags & FL_PCPU) {
 854                 KASSERT(&ft->ft_table.pcpu[curcpu][0] != NULL, ("pcpu not set"));
 855                 fle = &ft->ft_table.pcpu[curcpu][index];
 856         } else {
 857                 KASSERT(&ft->ft_table.global[0] != NULL, ("global not set"));
 858                 fle = &ft->ft_table.global[index];
 859         }
 860
 861         return (fle);
 862 }
 863
 864 static int
 865 flow_stale(struct flowtable *ft, struct flentry *fle)
 866 {
 867         time_t idle_time;
 868
 869         if ((fle->f_fhash == 0)
 870             || ((fle->f_rt->rt_flags & RTF_HOST) &&
 871                 ((fle->f_rt->rt_flags & (RTF_UP))
 872                     != (RTF_UP)))
 873             || (fle->f_rt->rt_ifp == NULL)
 874             || !RT_LINK_IS_UP(fle->f_rt->rt_ifp))
 875                 return (1);
 876
 877         idle_time = time_uptime - fle->f_uptime;
 878
 879         if ((fle->f_flags & FL_STALE) ||
 880             ((fle->f_flags & (TH_SYN|TH_ACK|TH_FIN)) == 0
 881                 && (idle_time > ft->ft_udp_idle)) ||
 882             ((fle->f_flags & TH_FIN)
 883                 && (idle_time > ft->ft_fin_wait_idle)) ||
 884             ((fle->f_flags & (TH_SYN|TH_ACK)) == TH_SYN
 885                 && (idle_time > ft->ft_syn_idle)) ||
 886             ((fle->f_flags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)
 887                 && (idle_time > ft->ft_tcp_idle)) ||
 888             ((fle->f_rt->rt_flags & RTF_UP) == 0 ||
 889                 (fle->f_rt->rt_ifp == NULL)))
 890                 return (1);
 891
 892         return (0);
 893 }
 894
 895 static void
 896 flowtable_set_hashkey(struct flentry *fle, uint32_t *key)
 897 {
 898         uint32_t *hashkey;
 899         int i, nwords;
 900
 901         if (fle->f_flags & FL_IPV6) {
 902                 nwords = 9;
 903                 hashkey = ((struct flentry_v4 *)fle)->fl_flow.ipf_key;
 904         } else {
 905                 nwords = 3;
 906                 hashkey = ((struct flentry_v6 *)fle)->fl_flow.ipf_key;
 907         }
 908
 909         for (i = 0; i < nwords; i++)
 910                 hashkey[i] = key[i];
 911 }
 912
 913 static struct flentry *
 914 flow_alloc(struct flowtable *ft)
 915 {
 916         struct flentry *newfle;
 917         uma_zone_t zone;
 918
 919         newfle = NULL;
 920         zone = (ft->ft_flags & FL_IPV6) ? V_flow_ipv6_zone : V_flow_ipv4_zone;
 921
 922         newfle = uma_zalloc(zone, M_NOWAIT | M_ZERO);
 923         if (newfle != NULL)
 924                 atomic_add_int(&ft->ft_count, 1);
 925         return (newfle);
 926 }
 927
 928 static void
 929 flow_free(struct flentry *fle, struct flowtable *ft)
 930 {
 931         uma_zone_t zone;
 932
 933         zone = (ft->ft_flags & FL_IPV6) ? V_flow_ipv6_zone : V_flow_ipv4_zone;
 934         atomic_add_int(&ft->ft_count, -1);
 935         uma_zfree(zone, fle);
 936 }
 937
 938 static int
 939 flow_full(struct flowtable *ft)
 940 {
 941         boolean_t full;
 942         uint32_t count;
 943
 944         full = ft->ft_full;
 945         count = ft->ft_count;
 946
 947         if (full && (count < (V_flowtable_nmbflows - (V_flowtable_nmbflows >> 3))))
 948                 ft->ft_full = FALSE;
 949         else if (!full && (count > (V_flowtable_nmbflows - (V_flowtable_nmbflows >> 5))))
 950                 ft->ft_full = TRUE;
 951
 952         if (full && !ft->ft_full) {
 953                 flowclean_freq = 4*hz;
 954                 if ((ft->ft_flags & FL_HASH_ALL) == 0)
 955                         ft->ft_udp_idle = ft->ft_fin_wait_idle =
 956                             ft->ft_syn_idle = ft->ft_tcp_idle = 5;
 957                 cv_broadcast(&flowclean_c_cv);
 958         } else if (!full && ft->ft_full) {
 959                 flowclean_freq = 20*hz;
 960                 if ((ft->ft_flags & FL_HASH_ALL) == 0)
 961                         ft->ft_udp_idle = ft->ft_fin_wait_idle =
 962                             ft->ft_syn_idle = ft->ft_tcp_idle = 30;
 963         }
 964
 965         return (ft->ft_full);
 966 }
 967
 968 static int
 969 flowtable_insert(struct flowtable *ft, uint32_t hash, uint32_t *key,
 970     uint32_t fibnum, struct route *ro, uint16_t flags)
 971 {
 972         struct flentry *fle, *fletail, *newfle, **flep;
 973         struct flowtable_stats *fs = &ft->ft_stats[curcpu];
 974         int depth;
 975         bitstr_t *mask;
 976         uint8_t proto;
 977
 978         newfle = flow_alloc(ft);
 979         if (newfle == NULL)
 980                 return (ENOMEM);
 981
 982         newfle->f_flags |= (flags & FL_IPV6);
 983         proto = flags_to_proto(flags);
 984
 985         FL_ENTRY_LOCK(ft, hash);
 986         mask = flowtable_mask(ft);
 987         flep = flowtable_entry(ft, hash);
 988         fletail = fle = *flep;
 989
 990         if (fle == NULL) {
 991                 bit_set(mask, FL_ENTRY_INDEX(ft, hash));
 992                 *flep = fle = newfle;
 993                 goto skip;
 994         }
 995
 996         depth = 0;
 997         fs->ft_collisions++;
 998         /*
 999          * find end of list and make sure that we were not
1000          * preempted by another thread handling this flow
1001          */
1002         while (fle != NULL) {
1003                 if (fle->f_fhash == hash && !flow_stale(ft, fle)) {
1004                         /*
1005                          * there was either a hash collision
1006                          * or we lost a race to insert
1007                          */
1008                         FL_ENTRY_UNLOCK(ft, hash);
1009                         flow_free(newfle, ft);
1010
1011                         if (flags & FL_OVERWRITE)
1012                                 goto skip;
1013                         return (EEXIST);
1014                 }
1015                 /*
1016                  * re-visit this double condition XXX
1017                  */
1018                 if (fletail->f_next != NULL)
1019                         fletail = fle->f_next;
1020
1021                 depth++;
1022                 fle = fle->f_next;
1023         }
1024
1025         if (depth > fs->ft_max_depth)
1026                 fs->ft_max_depth = depth;
1027         fletail->f_next = newfle;
1028         fle = newfle;
1029 skip:
1030         flowtable_set_hashkey(fle, key);
1031
1032         fle->f_proto = proto;
1033         fle->f_rt = ro->ro_rt;
1034         fle->f_lle = ro->ro_lle;
1035         fle->f_fhash = hash;
1036         fle->f_fibnum = fibnum;
1037         fle->f_uptime = time_uptime;
1038         FL_ENTRY_UNLOCK(ft, hash);
1039         return (0);
1040 }
1041
1042 int
1043 kern_flowtable_insert(struct flowtable *ft,
1044     struct sockaddr_storage *ssa, struct sockaddr_storage *dsa,
1045     struct route *ro, uint32_t fibnum, int flags)
1046 {
1047         uint32_t key[9], hash;
1048
1049         flags = (ft->ft_flags | flags | FL_OVERWRITE);
1050         hash = 0;
1051
1052 #ifdef INET
1053         if (ssa->ss_family == AF_INET)
1054                 hash = ipv4_flow_lookup_hash_internal((struct sockaddr_in *)ssa,
1055                     (struct sockaddr_in *)dsa, key, flags);
1056 #endif
1057 #ifdef INET6
1058         if (ssa->ss_family == AF_INET6)
1059                 hash = ipv6_flow_lookup_hash_internal((struct sockaddr_in6 *)ssa,
1060                     (struct sockaddr_in6 *)dsa, key, flags);
1061 #endif
1062         if (ro->ro_rt == NULL || ro->ro_lle == NULL)
1063                 return (EINVAL);
1064
1065         FLDPRINTF(ft, FL_DEBUG,
1066             "kern_flowtable_insert: key=%x:%x:%x hash=%x fibnum=%d flags=%x\n",
1067             key[0], key[1], key[2], hash, fibnum, flags);
1068         return (flowtable_insert(ft, hash, key, fibnum, ro, flags));
1069 }
1070
1071 static int
1072 flowtable_key_equal(struct flentry *fle, uint32_t *key)
1073 {
1074         uint32_t *hashkey;
1075         int i, nwords;
1076
1077         if (fle->f_flags & FL_IPV6) {
1078                 nwords = 9;
1079                 hashkey = ((struct flentry_v4 *)fle)->fl_flow.ipf_key;
1080         } else {
1081                 nwords = 3;
1082                 hashkey = ((struct flentry_v6 *)fle)->fl_flow.ipf_key;
1083         }
1084
1085         for (i = 0; i < nwords; i++)
1086                 if (hashkey[i] != key[i])
1087                         return (0);
1088
1089         return (1);
1090 }
1091
1092 struct flentry *
1093 flowtable_lookup_mbuf(struct flowtable *ft, struct mbuf *m, int af)
1094 {
1095         struct flentry *fle = NULL;
1096
1097 #ifdef INET
1098         if (af == AF_INET)
1099                 fle = flowtable_lookup_mbuf4(ft, m);
1100 #endif
1101 #ifdef INET6
1102         if (af == AF_INET6)
1103                 fle = flowtable_lookup_mbuf6(ft, m);
1104 #endif
1105         if (fle != NULL && m != NULL && (m->m_flags & M_FLOWID) == 0) {
1106                 m->m_flags |= M_FLOWID;
1107                 m->m_pkthdr.flowid = fle->f_fhash;
1108         }
1109         return (fle);
1110 }
1111
1112 struct flentry *
1113 flowtable_lookup(struct flowtable *ft, struct sockaddr_storage *ssa,
1114     struct sockaddr_storage *dsa, uint32_t fibnum, int flags)
1115 {
1116         uint32_t key[9], hash;
1117         struct flentry *fle;
1118         struct flowtable_stats *fs = &ft->ft_stats[curcpu];
1119         uint8_t proto = 0;
1120         int error = 0;
1121         struct rtentry *rt;
1122         struct llentry *lle;
1123         struct route sro, *ro;
1124         struct route_in6 sro6;
1125
1126         sro.ro_rt = sro6.ro_rt = NULL;
1127         sro.ro_lle = sro6.ro_lle = NULL;
1128         ro = NULL;
1129         hash = 0;
1130         flags |= ft->ft_flags;
1131         proto = flags_to_proto(flags);
1132 #ifdef INET
1133         if (ssa->ss_family == AF_INET) {
1134                 struct sockaddr_in *ssin, *dsin;
1135
1136                 ro = &sro;
1137                 memcpy(&ro->ro_dst, dsa, sizeof(struct sockaddr_in));
1138                 /*
1139                  * The harvested source and destination addresses
1140                  * may contain port information if the packet is
1141                  * from a transport protocol (e.g. TCP/UDP). The
1142                  * port field must be cleared before performing
1143                  * a route lookup.
1144                  */
1145                 ((struct sockaddr_in *)&ro->ro_dst)->sin_port = 0;
1146                 dsin = (struct sockaddr_in *)dsa;
1147                 ssin = (struct sockaddr_in *)ssa;
1148                 if ((dsin->sin_addr.s_addr == ssin->sin_addr.s_addr) ||
1149                     (ntohl(dsin->sin_addr.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
1150                     (ntohl(ssin->sin_addr.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
1151                         return (NULL);
1152
1153                 hash = ipv4_flow_lookup_hash_internal(ssin, dsin, key, flags);
1154         }
1155 #endif
1156 #ifdef INET6
1157         if (ssa->ss_family == AF_INET6) {
1158                 struct sockaddr_in6 *ssin6, *dsin6;
1159
1160                 ro = (struct route *)&sro6;
1161                 memcpy(&sro6.ro_dst, dsa,
1162                     sizeof(struct sockaddr_in6));
1163                 ((struct sockaddr_in6 *)&ro->ro_dst)->sin6_port = 0;
1164                 dsin6 = (struct sockaddr_in6 *)dsa;
1165                 ssin6 = (struct sockaddr_in6 *)ssa;
1166
1167                 flags |= FL_IPV6;
1168                 hash = ipv6_flow_lookup_hash_internal(ssin6, dsin6, key, flags);
1169         }
1170 #endif
1171         /*
1172          * Ports are zero and this isn't a transmit cache
1173          * - thus not a protocol for which we need to keep
1174          * state
1175          * FL_HASH_ALL => key[0] != 0 for TCP || UDP || SCTP
1176          */
1177         if (hash == 0 || (key[0] == 0 && (ft->ft_flags & FL_HASH_ALL)))
1178                 return (NULL);
1179
1180         fs->ft_lookups++;
1181         FL_ENTRY_LOCK(ft, hash);
1182         if ((fle = FL_ENTRY(ft, hash)) == NULL) {
1183                 FL_ENTRY_UNLOCK(ft, hash);
1184                 goto uncached;
1185         }
1186 keycheck:
1187         rt = __DEVOLATILE(struct rtentry *, fle->f_rt);
1188         lle = __DEVOLATILE(struct llentry *, fle->f_lle);
1189         if ((rt != NULL)
1190             && lle != NULL
1191             && fle->f_fhash == hash
1192             && flowtable_key_equal(fle, key)
1193             && (proto == fle->f_proto)
1194             && (fibnum == fle->f_fibnum)
1195             && (rt->rt_flags & RTF_UP)
1196             && (rt->rt_ifp != NULL)
1197             && (lle->la_flags & LLE_VALID)) {
1198                 fs->ft_hits++;
1199                 fle->f_uptime = time_uptime;
1200                 fle->f_flags |= flags;
1201                 FL_ENTRY_UNLOCK(ft, hash);
1202                 return (fle);
1203         } else if (fle->f_next != NULL) {
1204                 fle = fle->f_next;
1205                 goto keycheck;
1206         }
1207         FL_ENTRY_UNLOCK(ft, hash);
1208 uncached:
1209         if (flags & FL_NOAUTO || flow_full(ft))
1210                 return (NULL);
1211
1212         fs->ft_misses++;
1213         /*
1214          * This bit of code ends up locking the
1215          * same route 3 times (just like ip_output + ether_output)
1216          * - at lookup
1217          * - in rt_check when called by arpresolve
1218          * - dropping the refcount for the rtentry
1219          *
1220          * This could be consolidated to one if we wrote a variant
1221          * of arpresolve with an rt_check variant that expected to
1222          * receive the route locked
1223          */
1224
1225 #ifdef INVARIANTS
1226         if ((ro->ro_dst.sa_family != AF_INET) &&
1227             (ro->ro_dst.sa_family != AF_INET6))
1228                 panic("sa_family == %d\n", ro->ro_dst.sa_family);
1229 #endif
1230
1231         ft->ft_rtalloc(ro, hash, fibnum);
1232         if (ro->ro_rt == NULL)
1233                 error = ENETUNREACH;
1234         else {
1235                 struct llentry *lle = NULL;
1236                 struct sockaddr_storage *l3addr;
1237                 struct rtentry *rt = ro->ro_rt;
1238                 struct ifnet *ifp = rt->rt_ifp;
1239
1240                 if (ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) {
1241                         RTFREE(rt);
1242                         ro->ro_rt = NULL;
1243                         return (NULL);
1244                 }
1245 #ifdef INET6
1246                 if (ssa->ss_family == AF_INET6) {
1247                         struct sockaddr_in6 *dsin6;
1248
1249                         dsin6 = (struct sockaddr_in6 *)dsa;
1250                         if (in6_localaddr(&dsin6->sin6_addr)) {
1251                                 RTFREE(rt);
1252                                 ro->ro_rt = NULL;
1253                                 return (NULL);
1254                         }
1255
1256                         if (rt->rt_flags & RTF_GATEWAY)
1257                                 l3addr = (struct sockaddr_storage *)rt->rt_gateway;
1258
1259                         else
1260                                 l3addr = (struct sockaddr_storage *)&ro->ro_dst;
1261                         lle = llentry_alloc(ifp, LLTABLE6(ifp), l3addr);
1262                 }
1263 #endif
1264 #ifdef INET
1265                 if (ssa->ss_family == AF_INET) {
1266                         if (rt->rt_flags & RTF_GATEWAY)
1267                                 l3addr = (struct sockaddr_storage *)rt->rt_gateway;
1268                         else
1269                                 l3addr = (struct sockaddr_storage *)&ro->ro_dst;
1270                         lle = llentry_alloc(ifp, LLTABLE(ifp), l3addr);
1271                 }
1272
1273 #endif
1274                 ro->ro_lle = lle;
1275
1276                 if (lle == NULL) {
1277                         RTFREE(rt);
1278                         ro->ro_rt = NULL;
1279                         return (NULL);
1280                 }
1281                 error = flowtable_insert(ft, hash, key, fibnum, ro, flags);
1282
1283                 if (error) {
1284                         RTFREE(rt);
1285                         LLE_FREE(lle);
1286                         ro->ro_rt = NULL;
1287                         ro->ro_lle = NULL;
1288                 }
1289         }
1290
1291         return ((error) ? NULL : fle);
1292 }
1293
1294 /*
1295  * used by the bit_alloc macro
1296  */
1297 #define calloc(count, size) malloc((count)*(size), M_DEVBUF, M_WAITOK|M_ZERO)
1298
1299 struct flowtable *
1300 flowtable_alloc(char *name, int nentry, int flags)
1301 {
1302         struct flowtable *ft, *fttail;
1303         int i;
1304
1305         if (V_flow_hashjitter == 0)
1306                 V_flow_hashjitter = arc4random();
1307
1308         KASSERT(nentry > 0, ("nentry must be > 0, is %d\n", nentry));
1309
1310         ft = malloc(sizeof(struct flowtable),
1311             M_RTABLE, M_WAITOK | M_ZERO);
1312
1313         ft->ft_name = name;
1314         ft->ft_flags = flags;
1315         ft->ft_size = nentry;
1316 #ifdef RADIX_MPATH
1317         ft->ft_rtalloc = rtalloc_mpath_fib;
1318 #else
1319         ft->ft_rtalloc = rtalloc_ign_wrapper;
1320 #endif
1321         if (flags & FL_PCPU) {
1322                 ft->ft_lock = flowtable_pcpu_lock;
1323                 ft->ft_unlock = flowtable_pcpu_unlock;
1324
1325                 for (i = 0; i <= mp_maxid; i++) {
1326                         ft->ft_table.pcpu[i] =
1327                             malloc(nentry*sizeof(struct flentry *),
1328                                 M_RTABLE, M_WAITOK | M_ZERO);
1329                         ft->ft_masks[i] = bit_alloc(nentry);
1330                 }
1331         } else {
1332                 ft->ft_lock_count = 2*(powerof2(mp_maxid + 1) ? (mp_maxid + 1):
1333                     (fls(mp_maxid + 1) << 1));
1334
1335                 ft->ft_lock = flowtable_global_lock;
1336                 ft->ft_unlock = flowtable_global_unlock;
1337                 ft->ft_table.global =
1338                             malloc(nentry*sizeof(struct flentry *),
1339                                 M_RTABLE, M_WAITOK | M_ZERO);
1340                 ft->ft_locks = malloc(ft->ft_lock_count*sizeof(struct mtx),
1341                                 M_RTABLE, M_WAITOK | M_ZERO);
1342                 for (i = 0; i < ft->ft_lock_count; i++)
1343                         mtx_init(&ft->ft_locks[i], "flow", NULL, MTX_DEF|MTX_DUPOK);
1344
1345                 ft->ft_masks[0] = bit_alloc(nentry);
1346         }
1347         ft->ft_tmpmask = bit_alloc(nentry);
1348
1349         /*
1350          * In the local transmit case the table truly is
1351          * just a cache - so everything is eligible for
1352          * replacement after 5s of non-use
1353          */
1354         if (flags & FL_HASH_ALL) {
1355                 ft->ft_udp_idle = V_flowtable_udp_expire;
1356                 ft->ft_syn_idle = V_flowtable_syn_expire;
1357                 ft->ft_fin_wait_idle = V_flowtable_fin_wait_expire;
1358                 ft->ft_tcp_idle = V_flowtable_fin_wait_expire;
1359         } else {
1360                 ft->ft_udp_idle = ft->ft_fin_wait_idle =
1361                     ft->ft_syn_idle = ft->ft_tcp_idle = 30;
1362
1363         }
1364
1365         /*
1366          * hook in to the cleaner list
1367          */
1368         if (V_flow_list_head == NULL)
1369                 V_flow_list_head = ft;
1370         else {
1371                 fttail = V_flow_list_head;
1372                 while (fttail->ft_next != NULL)
1373                         fttail = fttail->ft_next;
1374                 fttail->ft_next = ft;
1375         }
1376
1377         return (ft);
1378 }
1379
1380 /*
1381  * The rest of the code is devoted to garbage collection of expired entries.
1382  * It is a new additon made necessary by the switch to dynamically allocating
1383  * flow tables.
1384  *
1385  */
1386 static void
1387 fle_free(struct flentry *fle, struct flowtable *ft)
1388 {
1389         struct rtentry *rt;
1390         struct llentry *lle;
1391
1392         rt = __DEVOLATILE(struct rtentry *, fle->f_rt);
1393         lle = __DEVOLATILE(struct llentry *, fle->f_lle);
1394         if (rt != NULL)
1395                 RTFREE(rt);
1396         if (lle != NULL)
1397                 LLE_FREE(lle);
1398         flow_free(fle, ft);
1399 }
1400
1401 static void
1402 flowtable_free_stale(struct flowtable *ft, struct rtentry *rt)
1403 {
1404         int curbit = 0, count;
1405         struct flentry *fle,  **flehead, *fleprev;
1406         struct flentry *flefreehead, *flefreetail, *fletmp;
1407         bitstr_t *mask, *tmpmask;
1408         struct flowtable_stats *fs = &ft->ft_stats[curcpu];
1409
1410         flefreehead = flefreetail = NULL;
1411         mask = flowtable_mask(ft);
1412         tmpmask = ft->ft_tmpmask;
1413         memcpy(tmpmask, mask, ft->ft_size/8);
1414         /*
1415          * XXX Note to self, bit_ffs operates at the byte level
1416          * and thus adds gratuitous overhead
1417          */
1418         bit_ffs(tmpmask, ft->ft_size, &curbit);
1419         while (curbit != -1) {
1420                 if (curbit >= ft->ft_size || curbit < -1) {
1421                         log(LOG_ALERT,
1422                             "warning: bad curbit value %d \n",
1423                             curbit);
1424                         break;
1425                 }
1426
1427                 FL_ENTRY_LOCK(ft, curbit);
1428                 flehead = flowtable_entry(ft, curbit);
1429                 fle = fleprev = *flehead;
1430
1431                 fs->ft_free_checks++;
1432 #ifdef DIAGNOSTIC
1433                 if (fle == NULL && curbit > 0) {
1434                         log(LOG_ALERT,
1435                             "warning bit=%d set, but no fle found\n",
1436                             curbit);
1437                 }
1438 #endif
1439                 while (fle != NULL) {
1440                         if (rt != NULL) {
1441                                 if (__DEVOLATILE(struct rtentry *, fle->f_rt) != rt) {
1442                                         fleprev = fle;
1443                                         fle = fle->f_next;
1444                                         continue;
1445                                 }
1446                         } else if (!flow_stale(ft, fle)) {
1447                                 fleprev = fle;
1448                                 fle = fle->f_next;
1449                                 continue;
1450                         }
1451                         /*
1452                          * delete head of the list
1453                          */
1454                         if (fleprev == *flehead) {
1455                                 fletmp = fleprev;
1456                                 if (fle == fleprev) {
1457                                         fleprev = *flehead = fle->f_next;
1458                                 } else
1459                                         fleprev = *flehead = fle;
1460                                 fle = fle->f_next;
1461                         } else {
1462                                 /*
1463                                  * don't advance fleprev
1464                                  */
1465                                 fletmp = fle;
1466                                 fleprev->f_next = fle->f_next;
1467                                 fle = fleprev->f_next;
1468                         }
1469
1470                         if (flefreehead == NULL)
1471                                 flefreehead = flefreetail = fletmp;
1472                         else {
1473                                 flefreetail->f_next = fletmp;
1474                                 flefreetail = fletmp;
1475                         }
1476                         fletmp->f_next = NULL;
1477                 }
1478                 if (*flehead == NULL)
1479                         bit_clear(mask, curbit);
1480                 FL_ENTRY_UNLOCK(ft, curbit);
1481                 bit_clear(tmpmask, curbit);
1482                 bit_ffs(tmpmask, ft->ft_size, &curbit);
1483         }
1484         count = 0;
1485         while ((fle = flefreehead) != NULL) {
1486                 flefreehead = fle->f_next;
1487                 count++;
1488                 fs->ft_frees++;
1489                 fle_free(fle, ft);
1490         }
1491         if (V_flowtable_debug && count)
1492                 log(LOG_DEBUG, "freed %d flow entries\n", count);
1493 }
1494
1495 void
1496 flowtable_route_flush(struct flowtable *ft, struct rtentry *rt)
1497 {
1498         int i;
1499
1500         if (ft->ft_flags & FL_PCPU) {
1501                 CPU_FOREACH(i) {
1502                         if (smp_started == 1) {
1503                                 thread_lock(curthread);
1504                                 sched_bind(curthread, i);
1505                                 thread_unlock(curthread);
1506                         }
1507
1508                         flowtable_free_stale(ft, rt);
1509
1510                         if (smp_started == 1) {
1511                                 thread_lock(curthread);
1512                                 sched_unbind(curthread);
1513                                 thread_unlock(curthread);
1514                         }
1515                 }
1516         } else {
1517                 flowtable_free_stale(ft, rt);
1518         }
1519 }
1520
1521 static void
1522 flowtable_clean_vnet(void)
1523 {
1524         struct flowtable *ft;
1525         int i;
1526
1527         ft = V_flow_list_head;
1528         while (ft != NULL) {
1529                 if (ft->ft_flags & FL_PCPU) {
1530                         CPU_FOREACH(i) {
1531                                 if (smp_started == 1) {
1532                                         thread_lock(curthread);
1533                                         sched_bind(curthread, i);
1534                                         thread_unlock(curthread);
1535                                 }
1536
1537                                 flowtable_free_stale(ft, NULL);
1538
1539                                 if (smp_started == 1) {
1540                                         thread_lock(curthread);
1541                                         sched_unbind(curthread);
1542                                         thread_unlock(curthread);
1543                                 }
1544                         }
1545                 } else {
1546                         flowtable_free_stale(ft, NULL);
1547                 }
1548                 ft = ft->ft_next;
1549         }
1550 }
1551
1552 static void
1553 flowtable_cleaner(void)
1554 {
1555         VNET_ITERATOR_DECL(vnet_iter);
1556         struct thread *td;
1557
1558         if (bootverbose)
1559                 log(LOG_INFO, "flowtable cleaner started\n");
1560         td = curthread;
1561         while (1) {
1562                 VNET_LIST_RLOCK();
1563                 VNET_FOREACH(vnet_iter) {
1564                         CURVNET_SET(vnet_iter);
1565                         flowtable_clean_vnet();
1566                         CURVNET_RESTORE();
1567                 }
1568                 VNET_LIST_RUNLOCK();
1569
1570                 /*
1571                  * The 10 second interval between cleaning checks
1572                  * is arbitrary
1573                  */
1574                 mtx_lock(&flowclean_lock);
1575                 thread_lock(td);
1576                 sched_prio(td, PPAUSE);
1577                 thread_unlock(td);
1578                 flowclean_cycles++;
1579                 cv_broadcast(&flowclean_f_cv);
1580                 cv_timedwait(&flowclean_c_cv, &flowclean_lock, flowclean_freq);
1581                 mtx_unlock(&flowclean_lock);
1582         }
1583 }
1584
1585 static void
1586 flowtable_flush(void *unused __unused)
1587 {
1588         uint64_t start;
1589
1590         mtx_lock(&flowclean_lock);
1591         start = flowclean_cycles;
1592         while (start == flowclean_cycles) {
1593                 cv_broadcast(&flowclean_c_cv);
1594                 cv_wait(&flowclean_f_cv, &flowclean_lock);
1595         }
1596         mtx_unlock(&flowclean_lock);
1597 }
1598
1599 static struct kproc_desc flow_kp = {
1600         "flowcleaner",
1601         flowtable_cleaner,
1602         &flowcleanerproc
1603 };
1604 SYSINIT(flowcleaner, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start, &flow_kp);
1605
1606 static void
1607 flowtable_init_vnet(const void *unused __unused)
1608 {
1609
1610         V_flowtable_nmbflows = 1024 + maxusers * 64 * mp_ncpus;
1611         V_flow_ipv4_zone = uma_zcreate("ip4flow", sizeof(struct flentry_v4),
1612             NULL, NULL, NULL, NULL, 64, UMA_ZONE_MAXBUCKET);
1613         V_flow_ipv6_zone = uma_zcreate("ip6flow", sizeof(struct flentry_v6),
1614             NULL, NULL, NULL, NULL, 64, UMA_ZONE_MAXBUCKET);
1615         uma_zone_set_max(V_flow_ipv4_zone, V_flowtable_nmbflows);
1616         uma_zone_set_max(V_flow_ipv6_zone, V_flowtable_nmbflows);
1617         V_flowtable_ready = 1;
1618 }
1619 VNET_SYSINIT(flowtable_init_vnet, SI_SUB_SMP, SI_ORDER_ANY,
1620     flowtable_init_vnet, NULL);
1621
1622 static void
1623 flowtable_init(const void *unused __unused)
1624 {
1625
1626         cv_init(&flowclean_c_cv, "c_flowcleanwait");
1627         cv_init(&flowclean_f_cv, "f_flowcleanwait");
1628         mtx_init(&flowclean_lock, "flowclean lock", NULL, MTX_DEF);
1629         EVENTHANDLER_REGISTER(ifnet_departure_event, flowtable_flush, NULL,
1630             EVENTHANDLER_PRI_ANY);
1631         flowclean_freq = 20*hz;
1632 }
1633 SYSINIT(flowtable_init, SI_SUB_KTHREAD_INIT, SI_ORDER_FIRST,
1634     flowtable_init, NULL);
1635
1636
1637 #ifdef VIMAGE
1638 static void
1639 flowtable_uninit(const void *unused __unused)
1640 {
1641
1642         V_flowtable_ready = 0;
1643         uma_zdestroy(V_flow_ipv4_zone);
1644         uma_zdestroy(V_flow_ipv6_zone);
1645 }
1646
1647 VNET_SYSUNINIT(flowtable_uninit, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY,
1648     flowtable_uninit, NULL);
1649 #endif
1650
1651 #ifdef DDB
1652 static uint32_t *
1653 flowtable_get_hashkey(struct flentry *fle)
1654 {
1655         uint32_t *hashkey;
1656
1657         if (fle->f_flags & FL_IPV6)
1658                 hashkey = ((struct flentry_v4 *)fle)->fl_flow.ipf_key;
1659         else
1660                 hashkey = ((struct flentry_v6 *)fle)->fl_flow.ipf_key;
1661
1662         return (hashkey);
1663 }
1664
1665 static bitstr_t *
1666 flowtable_mask_pcpu(struct flowtable *ft, int cpuid)
1667 {
1668         bitstr_t *mask;
1669
1670         if (ft->ft_flags & FL_PCPU)
1671                 mask = ft->ft_masks[cpuid];
1672         else
1673                 mask = ft->ft_masks[0];
1674
1675         return (mask);
1676 }
1677
1678 static struct flentry **
1679 flowtable_entry_pcpu(struct flowtable *ft, uint32_t hash, int cpuid)
1680 {
1681         struct flentry **fle;
1682         int index = (hash % ft->ft_size);
1683
1684         if (ft->ft_flags & FL_PCPU) {
1685                 fle = &ft->ft_table.pcpu[cpuid][index];
1686         } else {
1687                 fle = &ft->ft_table.global[index];
1688         }
1689
1690         return (fle);
1691 }
1692
1693 static void
1694 flow_show(struct flowtable *ft, struct flentry *fle)
1695 {
1696         int idle_time;
1697         int rt_valid, ifp_valid;
1698         uint16_t sport, dport;
1699         uint32_t *hashkey;
1700         char saddr[4*sizeof "123"], daddr[4*sizeof "123"];
1701         volatile struct rtentry *rt;
1702         struct ifnet *ifp = NULL;
1703
1704         idle_time = (int)(time_uptime - fle->f_uptime);
1705         rt = fle->f_rt;
1706         rt_valid = rt != NULL;
1707         if (rt_valid)
1708                 ifp = rt->rt_ifp;
1709         ifp_valid = ifp != NULL;
1710         hashkey = flowtable_get_hashkey(fle);
1711         if (fle->f_flags & FL_IPV6)
1712                 goto skipaddr;
1713
1714         inet_ntoa_r(*(struct in_addr *) &hashkey[2], daddr);
1715         if (ft->ft_flags & FL_HASH_ALL) {
1716                 inet_ntoa_r(*(struct in_addr *) &hashkey[1], saddr);
1717                 sport = ntohs(((uint16_t *)hashkey)[0]);
1718                 dport = ntohs(((uint16_t *)hashkey)[1]);
1719                 db_printf("%s:%d->%s:%d",
1720                     saddr, sport, daddr,
1721                     dport);
1722         } else
1723                 db_printf("%s ", daddr);
1724
1725 skipaddr:
1726         if (fle->f_flags & FL_STALE)
1727                 db_printf(" FL_STALE ");
1728         if (fle->f_flags & FL_TCP)
1729                 db_printf(" FL_TCP ");
1730         if (fle->f_flags & FL_UDP)
1731                 db_printf(" FL_UDP ");
1732         if (rt_valid) {
1733                 if (rt->rt_flags & RTF_UP)
1734                         db_printf(" RTF_UP ");
1735         }
1736         if (ifp_valid) {
1737                 if (ifp->if_flags & IFF_LOOPBACK)
1738                         db_printf(" IFF_LOOPBACK ");
1739                 if (ifp->if_flags & IFF_UP)
1740                         db_printf(" IFF_UP ");
1741                 if (ifp->if_flags & IFF_POINTOPOINT)
1742                         db_printf(" IFF_POINTOPOINT ");
1743         }
1744         if (fle->f_flags & FL_IPV6)
1745                 db_printf("\n\tkey=%08x:%08x:%08x%08x:%08x:%08x%08x:%08x:%08x",
1746                     hashkey[0], hashkey[1], hashkey[2],
1747                     hashkey[3], hashkey[4], hashkey[5],
1748                     hashkey[6], hashkey[7], hashkey[8]);
1749         else
1750                 db_printf("\n\tkey=%08x:%08x:%08x ",
1751                     hashkey[0], hashkey[1], hashkey[2]);
1752         db_printf("hash=%08x idle_time=%03d"
1753             "\n\tfibnum=%02d rt=%p",
1754             fle->f_fhash, idle_time, fle->f_fibnum, fle->f_rt);
1755         db_printf("\n");
1756 }
1757
1758 static void
1759 flowtable_show(struct flowtable *ft, int cpuid)
1760 {
1761         int curbit = 0;
1762         struct flentry *fle,  **flehead;
1763         bitstr_t *mask, *tmpmask;
1764
1765         if (cpuid != -1)
1766                 db_printf("cpu: %d\n", cpuid);
1767         mask = flowtable_mask_pcpu(ft, cpuid);
1768         tmpmask = ft->ft_tmpmask;
1769         memcpy(tmpmask, mask, ft->ft_size/8);
1770         /*
1771          * XXX Note to self, bit_ffs operates at the byte level
1772          * and thus adds gratuitous overhead
1773          */
1774         bit_ffs(tmpmask, ft->ft_size, &curbit);
1775         while (curbit != -1) {
1776                 if (curbit >= ft->ft_size || curbit < -1) {
1777                         db_printf("warning: bad curbit value %d \n",
1778                             curbit);
1779                         break;
1780                 }
1781
1782                 flehead = flowtable_entry_pcpu(ft, curbit, cpuid);
1783                 fle = *flehead;
1784
1785                 while (fle != NULL) {
1786                         flow_show(ft, fle);
1787                         fle = fle->f_next;
1788                         continue;
1789                 }
1790                 bit_clear(tmpmask, curbit);
1791                 bit_ffs(tmpmask, ft->ft_size, &curbit);
1792         }
1793 }
1794
1795 static void
1796 flowtable_show_vnet(void)
1797 {
1798         struct flowtable *ft;
1799         int i;
1800
1801         ft = V_flow_list_head;
1802         while (ft != NULL) {
1803                 printf("name: %s\n", ft->ft_name);
1804                 if (ft->ft_flags & FL_PCPU) {
1805                         CPU_FOREACH(i) {
1806                                 flowtable_show(ft, i);
1807                         }
1808                 } else {
1809                         flowtable_show(ft, -1);
1810                 }
1811                 ft = ft->ft_next;
1812         }
1813 }
1814
1815 DB_SHOW_COMMAND(flowtables, db_show_flowtables)
1816 {
1817         VNET_ITERATOR_DECL(vnet_iter);
1818
1819         VNET_FOREACH(vnet_iter) {
1820                 CURVNET_SET(vnet_iter);
1821 #ifdef VIMAGE
1822                 db_printf("vnet %p\n", vnet_iter);
1823 #endif
1824                 flowtable_show_vnet();
1825                 CURVNET_RESTORE();
1826         }
1827 }
1828 #endif