1139823Simp/*- 2122922Sandre * Copyright (c) 2002 Andre Oppermann, Internet Business Solutions AG 3122922Sandre * All rights reserved. 4122922Sandre * 5122922Sandre * Redistribution and use in source and binary forms, with or without 6122922Sandre * modification, are permitted provided that the following conditions 7122922Sandre * are met: 8122922Sandre * 1. Redistributions of source code must retain the above copyright 9122922Sandre * notice, this list of conditions and the following disclaimer. 10122922Sandre * 2. Redistributions in binary form must reproduce the above copyright 11122922Sandre * notice, this list of conditions and the following disclaimer in the 12122922Sandre * documentation and/or other materials provided with the distribution. 13122922Sandre * 3. The name of the author may not be used to endorse or promote 14122922Sandre * products derived from this software without specific prior written 15122922Sandre * permission. 16122922Sandre * 17122922Sandre * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18122922Sandre * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19122922Sandre * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20122922Sandre * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21122922Sandre * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22122922Sandre * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23122922Sandre * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24122922Sandre * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25122922Sandre * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26122922Sandre * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27122922Sandre * SUCH DAMAGE. 28122922Sandre */ 29122922Sandre 30122922Sandre/* 31170030Srwatson * The tcp_hostcache moves the tcp-specific cached metrics from the routing 32170030Srwatson * table to a dedicated structure indexed by the remote IP address. It keeps 33170030Srwatson * information on the measured TCP parameters of past TCP sessions to allow 34170030Srwatson * better initial start values to be used with later connections to/from the 35170030Srwatson * same source. Depending on the network parameters (delay, bandwidth, max 36170030Srwatson * MTU, congestion window) between local and remote sites, this can lead to 37170030Srwatson * significant speed-ups for new TCP connections after the first one. 38122922Sandre * 39170030Srwatson * Due to the tcp_hostcache, all TCP-specific metrics information in the 40182411Srpaulo * routing table have been removed. The inpcb no longer keeps a pointer to 41170030Srwatson * the routing entry, and protocol-initiated route cloning has been removed 42170030Srwatson * as well. With these changes, the routing table has gone back to being 43170030Srwatson * more lightwight and only carries information related to packet forwarding. 44122922Sandre * 45170030Srwatson * tcp_hostcache is designed for multiple concurrent access in SMP 46170030Srwatson * environments and high contention. All bucket rows have their own lock and 47170030Srwatson * thus multiple lookups and modifies can be done at the same time as long as 48170030Srwatson * they are in different bucket rows. If a request for insertion of a new 49170030Srwatson * record can't be satisfied, it simply returns an empty structure. Nobody 50170030Srwatson * and nothing outside of tcp_hostcache.c will ever point directly to any 51170030Srwatson * entry in the tcp_hostcache. All communication is done in an 52170030Srwatson * object-oriented way and only functions of tcp_hostcache will manipulate 53170030Srwatson * hostcache entries. Otherwise, we are unable to achieve good behaviour in 54170030Srwatson * concurrent access situations. Since tcp_hostcache is only caching 55170030Srwatson * information, there are no fatal consequences if we either can't satisfy 56170030Srwatson * any particular request or have to drop/overwrite an existing entry because 57170030Srwatson * of bucket limit memory constrains. 58122922Sandre */ 59122922Sandre 60122922Sandre/* 61122922Sandre * Many thanks to jlemon for basic structure of tcp_syncache which is being 62122922Sandre * followed here. 63122922Sandre */ 64122922Sandre 65172467Ssilby#include <sys/cdefs.h> 66172467Ssilby__FBSDID("$FreeBSD$"); 67172467Ssilby 68122922Sandre#include "opt_inet6.h" 69122922Sandre 70122922Sandre#include <sys/param.h> 71122922Sandre#include <sys/systm.h> 72122922Sandre#include <sys/kernel.h> 73122922Sandre#include <sys/lock.h> 74122922Sandre#include <sys/mutex.h> 75122922Sandre#include <sys/malloc.h> 76122922Sandre#include <sys/socket.h> 77122922Sandre#include <sys/socketvar.h> 78122922Sandre#include <sys/sysctl.h> 79122922Sandre 80122922Sandre#include <net/if.h> 81194739Sbz#include <net/route.h> 82196019Srwatson#include <net/vnet.h> 83122922Sandre 84122922Sandre#include <netinet/in.h> 85122922Sandre#include <netinet/in_systm.h> 86122922Sandre#include <netinet/ip.h> 87122922Sandre#include <netinet/in_var.h> 88122922Sandre#include <netinet/in_pcb.h> 89122922Sandre#include <netinet/ip_var.h> 90122922Sandre#ifdef INET6 91122922Sandre#include <netinet/ip6.h> 92122922Sandre#include <netinet6/ip6_var.h> 93122922Sandre#endif 94122922Sandre#include <netinet/tcp.h> 95122922Sandre#include <netinet/tcp_var.h> 96185571Sbz#include <netinet/tcp_hostcache.h> 97122922Sandre#ifdef INET6 98122922Sandre#include <netinet6/tcp6_var.h> 99122922Sandre#endif 100122922Sandre 101122922Sandre#include <vm/uma.h> 102122922Sandre 103122922Sandre/* Arbitrary values */ 104122922Sandre#define TCP_HOSTCACHE_HASHSIZE 512 105122922Sandre#define TCP_HOSTCACHE_BUCKETLIMIT 30 106122922Sandre#define TCP_HOSTCACHE_EXPIRE 60*60 /* one hour */ 107122922Sandre#define TCP_HOSTCACHE_PRUNE 5*60 /* every 5 minutes */ 108122922Sandre 109215701Sdimstatic VNET_DEFINE(struct tcp_hostcache, tcp_hostcache); 110207369Sbz#define V_tcp_hostcache VNET(tcp_hostcache) 111207369Sbz 112215701Sdimstatic VNET_DEFINE(struct callout, tcp_hc_callout); 113195727Srwatson#define V_tcp_hc_callout VNET(tcp_hc_callout) 114195699Srwatson 115122922Sandrestatic struct hc_metrics *tcp_hc_lookup(struct in_conninfo *); 116122922Sandrestatic struct hc_metrics *tcp_hc_insert(struct in_conninfo *); 117122922Sandrestatic int sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS); 118203724Sbzstatic void tcp_hc_purge_internal(int); 119122922Sandrestatic void tcp_hc_purge(void *); 120122922Sandre 121227309Sedstatic SYSCTL_NODE(_net_inet_tcp, OID_AUTO, hostcache, CTLFLAG_RW, 0, 122182633Sbrooks "TCP Host cache"); 123122922Sandre 124217322SmdfSYSCTL_VNET_UINT(_net_inet_tcp_hostcache, OID_AUTO, cachelimit, CTLFLAG_RDTUN, 125195699Srwatson &VNET_NAME(tcp_hostcache.cache_limit), 0, 126183550Szec "Overall entry limit for hostcache"); 127122922Sandre 128217322SmdfSYSCTL_VNET_UINT(_net_inet_tcp_hostcache, OID_AUTO, hashsize, CTLFLAG_RDTUN, 129195699Srwatson &VNET_NAME(tcp_hostcache.hashsize), 0, 130183550Szec "Size of TCP hostcache hashtable"); 131122922Sandre 132217322SmdfSYSCTL_VNET_UINT(_net_inet_tcp_hostcache, OID_AUTO, bucketlimit, 133195699Srwatson CTLFLAG_RDTUN, &VNET_NAME(tcp_hostcache.bucket_limit), 0, 134183550Szec "Per-bucket hash limit for hostcache"); 135122922Sandre 136217322SmdfSYSCTL_VNET_UINT(_net_inet_tcp_hostcache, OID_AUTO, count, CTLFLAG_RD, 137195699Srwatson &VNET_NAME(tcp_hostcache.cache_count), 0, 138183550Szec "Current number of entries in hostcache"); 139122922Sandre 140195699SrwatsonSYSCTL_VNET_INT(_net_inet_tcp_hostcache, OID_AUTO, expire, CTLFLAG_RW, 141195699Srwatson &VNET_NAME(tcp_hostcache.expire), 0, 142183550Szec "Expire time of TCP hostcache entries"); 143122922Sandre 144195699SrwatsonSYSCTL_VNET_INT(_net_inet_tcp_hostcache, OID_AUTO, prune, CTLFLAG_RW, 145195699Srwatson &VNET_NAME(tcp_hostcache.prune), 0, 146195699Srwatson "Time between purge runs"); 147170434Syar 148195699SrwatsonSYSCTL_VNET_INT(_net_inet_tcp_hostcache, OID_AUTO, purge, CTLFLAG_RW, 149195699Srwatson &VNET_NAME(tcp_hostcache.purgeall), 0, 150183550Szec "Expire all entires on next purge run"); 151122922Sandre 152122922SandreSYSCTL_PROC(_net_inet_tcp_hostcache, OID_AUTO, list, 153167784Sandre CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP, 0, 0, 154167784Sandre sysctl_tcp_hc_list, "A", "List of all hostcache entries"); 155122922Sandre 156122922Sandre 157122922Sandrestatic MALLOC_DEFINE(M_HOSTCACHE, "hostcache", "TCP hostcache"); 158122922Sandre 159122922Sandre#define HOSTCACHE_HASH(ip) \ 160133874Srwatson (((ip)->s_addr ^ ((ip)->s_addr >> 7) ^ ((ip)->s_addr >> 17)) & \ 161181803Sbz V_tcp_hostcache.hashmask) 162122922Sandre 163122922Sandre/* XXX: What is the recommended hash to get good entropy for IPv6 addresses? */ 164133874Srwatson#define HOSTCACHE_HASH6(ip6) \ 165122922Sandre (((ip6)->s6_addr32[0] ^ \ 166122922Sandre (ip6)->s6_addr32[1] ^ \ 167122922Sandre (ip6)->s6_addr32[2] ^ \ 168122922Sandre (ip6)->s6_addr32[3]) & \ 169181803Sbz V_tcp_hostcache.hashmask) 170122922Sandre 171122922Sandre#define THC_LOCK(lp) mtx_lock(lp) 172122922Sandre#define THC_UNLOCK(lp) mtx_unlock(lp) 173122922Sandre 174122922Sandrevoid 175122922Sandretcp_hc_init(void) 176122922Sandre{ 177241735Szont u_int cache_limit; 178122922Sandre int i; 179122922Sandre 180122922Sandre /* 181170030Srwatson * Initialize hostcache structures. 182122922Sandre */ 183181803Sbz V_tcp_hostcache.cache_count = 0; 184181803Sbz V_tcp_hostcache.hashsize = TCP_HOSTCACHE_HASHSIZE; 185181803Sbz V_tcp_hostcache.bucket_limit = TCP_HOSTCACHE_BUCKETLIMIT; 186181803Sbz V_tcp_hostcache.expire = TCP_HOSTCACHE_EXPIRE; 187181803Sbz V_tcp_hostcache.prune = TCP_HOSTCACHE_PRUNE; 188122922Sandre 189133874Srwatson TUNABLE_INT_FETCH("net.inet.tcp.hostcache.hashsize", 190181803Sbz &V_tcp_hostcache.hashsize); 191181803Sbz if (!powerof2(V_tcp_hostcache.hashsize)) { 192133874Srwatson printf("WARNING: hostcache hash size is not a power of 2.\n"); 193181803Sbz V_tcp_hostcache.hashsize = TCP_HOSTCACHE_HASHSIZE; /* default */ 194133874Srwatson } 195181803Sbz V_tcp_hostcache.hashmask = V_tcp_hostcache.hashsize - 1; 196122922Sandre 197241735Szont TUNABLE_INT_FETCH("net.inet.tcp.hostcache.bucketlimit", 198241735Szont &V_tcp_hostcache.bucket_limit); 199241735Szont 200241735Szont cache_limit = V_tcp_hostcache.hashsize * V_tcp_hostcache.bucket_limit; 201241735Szont V_tcp_hostcache.cache_limit = cache_limit; 202241735Szont TUNABLE_INT_FETCH("net.inet.tcp.hostcache.cachelimit", 203241735Szont &V_tcp_hostcache.cache_limit); 204241735Szont if (V_tcp_hostcache.cache_limit > cache_limit) 205241735Szont V_tcp_hostcache.cache_limit = cache_limit; 206241735Szont 207122922Sandre /* 208170030Srwatson * Allocate the hash table. 209122922Sandre */ 210181803Sbz V_tcp_hostcache.hashbase = (struct hc_head *) 211181803Sbz malloc(V_tcp_hostcache.hashsize * sizeof(struct hc_head), 212122922Sandre M_HOSTCACHE, M_WAITOK | M_ZERO); 213122922Sandre 214122922Sandre /* 215170030Srwatson * Initialize the hash buckets. 216122922Sandre */ 217181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 218181803Sbz TAILQ_INIT(&V_tcp_hostcache.hashbase[i].hch_bucket); 219181803Sbz V_tcp_hostcache.hashbase[i].hch_length = 0; 220181803Sbz mtx_init(&V_tcp_hostcache.hashbase[i].hch_mtx, "tcp_hc_entry", 221122922Sandre NULL, MTX_DEF); 222122922Sandre } 223122922Sandre 224122922Sandre /* 225122922Sandre * Allocate the hostcache entries. 226122922Sandre */ 227181887Sjulian V_tcp_hostcache.zone = 228181888Sjulian uma_zcreate("hostcache", sizeof(struct hc_metrics), 229181888Sjulian NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 230181803Sbz uma_zone_set_max(V_tcp_hostcache.zone, V_tcp_hostcache.cache_limit); 231122922Sandre 232122922Sandre /* 233122922Sandre * Set up periodic cache cleanup. 234122922Sandre */ 235181803Sbz callout_init(&V_tcp_hc_callout, CALLOUT_MPSAFE); 236181887Sjulian callout_reset(&V_tcp_hc_callout, V_tcp_hostcache.prune * hz, 237191816Szec tcp_hc_purge, curvnet); 238122922Sandre} 239122922Sandre 240193731Szec#ifdef VIMAGE 241193731Szecvoid 242193731Szectcp_hc_destroy(void) 243193731Szec{ 244203724Sbz int i; 245193731Szec 246203724Sbz callout_drain(&V_tcp_hc_callout); 247193731Szec 248203724Sbz /* Purge all hc entries. */ 249203724Sbz tcp_hc_purge_internal(1); 250203724Sbz 251203724Sbz /* Free the uma zone and the allocated hash table. */ 252203724Sbz uma_zdestroy(V_tcp_hostcache.zone); 253203724Sbz 254203724Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) 255203724Sbz mtx_destroy(&V_tcp_hostcache.hashbase[i].hch_mtx); 256203724Sbz free(V_tcp_hostcache.hashbase, M_HOSTCACHE); 257193731Szec} 258193731Szec#endif 259193731Szec 260122922Sandre/* 261170030Srwatson * Internal function: look up an entry in the hostcache or return NULL. 262122922Sandre * 263122922Sandre * If an entry has been returned, the caller becomes responsible for 264122922Sandre * unlocking the bucket row after he is done reading/modifying the entry. 265122922Sandre */ 266122922Sandrestatic struct hc_metrics * 267122922Sandretcp_hc_lookup(struct in_conninfo *inc) 268122922Sandre{ 269122922Sandre int hash; 270122922Sandre struct hc_head *hc_head; 271122922Sandre struct hc_metrics *hc_entry; 272122922Sandre 273122922Sandre KASSERT(inc != NULL, ("tcp_hc_lookup with NULL in_conninfo pointer")); 274122922Sandre 275122922Sandre /* 276122922Sandre * Hash the foreign ip address. 277122922Sandre */ 278186222Sbz if (inc->inc_flags & INC_ISIPV6) 279122922Sandre hash = HOSTCACHE_HASH6(&inc->inc6_faddr); 280122922Sandre else 281122922Sandre hash = HOSTCACHE_HASH(&inc->inc_faddr); 282122922Sandre 283181803Sbz hc_head = &V_tcp_hostcache.hashbase[hash]; 284122922Sandre 285122922Sandre /* 286170030Srwatson * Acquire lock for this bucket row; we release the lock if we don't 287170030Srwatson * find an entry, otherwise the caller has to unlock after he is 288170030Srwatson * done. 289122922Sandre */ 290122922Sandre THC_LOCK(&hc_head->hch_mtx); 291122922Sandre 292122922Sandre /* 293170030Srwatson * Iterate through entries in bucket row looking for a match. 294122922Sandre */ 295122922Sandre TAILQ_FOREACH(hc_entry, &hc_head->hch_bucket, rmx_q) { 296186222Sbz if (inc->inc_flags & INC_ISIPV6) { 297122922Sandre if (memcmp(&inc->inc6_faddr, &hc_entry->ip6, 298122922Sandre sizeof(inc->inc6_faddr)) == 0) 299122922Sandre return hc_entry; 300122922Sandre } else { 301122922Sandre if (memcmp(&inc->inc_faddr, &hc_entry->ip4, 302122922Sandre sizeof(inc->inc_faddr)) == 0) 303122922Sandre return hc_entry; 304122922Sandre } 305122922Sandre } 306122922Sandre 307122922Sandre /* 308170030Srwatson * We were unsuccessful and didn't find anything. 309122922Sandre */ 310122922Sandre THC_UNLOCK(&hc_head->hch_mtx); 311122922Sandre return NULL; 312122922Sandre} 313122922Sandre 314122922Sandre/* 315170030Srwatson * Internal function: insert an entry into the hostcache or return NULL if 316170030Srwatson * unable to allocate a new one. 317133874Srwatson * 318122922Sandre * If an entry has been returned, the caller becomes responsible for 319122922Sandre * unlocking the bucket row after he is done reading/modifying the entry. 320122922Sandre */ 321122922Sandrestatic struct hc_metrics * 322122922Sandretcp_hc_insert(struct in_conninfo *inc) 323122922Sandre{ 324122922Sandre int hash; 325122922Sandre struct hc_head *hc_head; 326122922Sandre struct hc_metrics *hc_entry; 327122922Sandre 328122922Sandre KASSERT(inc != NULL, ("tcp_hc_insert with NULL in_conninfo pointer")); 329122922Sandre 330122922Sandre /* 331170030Srwatson * Hash the foreign ip address. 332122922Sandre */ 333186222Sbz if (inc->inc_flags & INC_ISIPV6) 334122922Sandre hash = HOSTCACHE_HASH6(&inc->inc6_faddr); 335122922Sandre else 336122922Sandre hash = HOSTCACHE_HASH(&inc->inc_faddr); 337122922Sandre 338181803Sbz hc_head = &V_tcp_hostcache.hashbase[hash]; 339122922Sandre 340122922Sandre /* 341170030Srwatson * Acquire lock for this bucket row; we release the lock if we don't 342170030Srwatson * find an entry, otherwise the caller has to unlock after he is 343170030Srwatson * done. 344122922Sandre */ 345122922Sandre THC_LOCK(&hc_head->hch_mtx); 346122922Sandre 347122922Sandre /* 348170030Srwatson * If the bucket limit is reached, reuse the least-used element. 349122922Sandre */ 350181803Sbz if (hc_head->hch_length >= V_tcp_hostcache.bucket_limit || 351181803Sbz V_tcp_hostcache.cache_count >= V_tcp_hostcache.cache_limit) { 352122922Sandre hc_entry = TAILQ_LAST(&hc_head->hch_bucket, hc_qhead); 353122922Sandre /* 354122922Sandre * At first we were dropping the last element, just to 355170030Srwatson * reacquire it in the next two lines again, which isn't very 356170030Srwatson * efficient. Instead just reuse the least used element. 357170030Srwatson * We may drop something that is still "in-use" but we can be 358170030Srwatson * "lossy". 359170405Sandre * Just give up if this bucket row is empty and we don't have 360170405Sandre * anything to replace. 361122922Sandre */ 362170405Sandre if (hc_entry == NULL) { 363170405Sandre THC_UNLOCK(&hc_head->hch_mtx); 364170405Sandre return NULL; 365170405Sandre } 366122922Sandre TAILQ_REMOVE(&hc_head->hch_bucket, hc_entry, rmx_q); 367181803Sbz V_tcp_hostcache.hashbase[hash].hch_length--; 368181803Sbz V_tcp_hostcache.cache_count--; 369190948Srwatson TCPSTAT_INC(tcps_hc_bucketoverflow); 370123028Sandre#if 0 371181803Sbz uma_zfree(V_tcp_hostcache.zone, hc_entry); 372122922Sandre#endif 373122922Sandre } else { 374122922Sandre /* 375170030Srwatson * Allocate a new entry, or balk if not possible. 376122922Sandre */ 377181803Sbz hc_entry = uma_zalloc(V_tcp_hostcache.zone, M_NOWAIT); 378122922Sandre if (hc_entry == NULL) { 379122922Sandre THC_UNLOCK(&hc_head->hch_mtx); 380122922Sandre return NULL; 381122922Sandre } 382122922Sandre } 383122922Sandre 384122922Sandre /* 385170030Srwatson * Initialize basic information of hostcache entry. 386122922Sandre */ 387122922Sandre bzero(hc_entry, sizeof(*hc_entry)); 388186222Sbz if (inc->inc_flags & INC_ISIPV6) 389123113Sandre bcopy(&inc->inc6_faddr, &hc_entry->ip6, sizeof(hc_entry->ip6)); 390122922Sandre else 391122922Sandre hc_entry->ip4 = inc->inc_faddr; 392122922Sandre hc_entry->rmx_head = hc_head; 393181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; 394122922Sandre 395122922Sandre /* 396170030Srwatson * Put it upfront. 397122922Sandre */ 398122922Sandre TAILQ_INSERT_HEAD(&hc_head->hch_bucket, hc_entry, rmx_q); 399181803Sbz V_tcp_hostcache.hashbase[hash].hch_length++; 400181803Sbz V_tcp_hostcache.cache_count++; 401190948Srwatson TCPSTAT_INC(tcps_hc_added); 402122922Sandre 403122922Sandre return hc_entry; 404122922Sandre} 405122922Sandre 406122922Sandre/* 407170030Srwatson * External function: look up an entry in the hostcache and fill out the 408170030Srwatson * supplied TCP metrics structure. Fills in NULL when no entry was found or 409170030Srwatson * a value is not set. 410122922Sandre */ 411122922Sandrevoid 412122922Sandretcp_hc_get(struct in_conninfo *inc, struct hc_metrics_lite *hc_metrics_lite) 413122922Sandre{ 414122922Sandre struct hc_metrics *hc_entry; 415122922Sandre 416122922Sandre /* 417170030Srwatson * Find the right bucket. 418122922Sandre */ 419122922Sandre hc_entry = tcp_hc_lookup(inc); 420122922Sandre 421122922Sandre /* 422170030Srwatson * If we don't have an existing object. 423122922Sandre */ 424122922Sandre if (hc_entry == NULL) { 425122922Sandre bzero(hc_metrics_lite, sizeof(*hc_metrics_lite)); 426122922Sandre return; 427122922Sandre } 428122922Sandre hc_entry->rmx_hits++; 429181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 430122922Sandre 431122922Sandre hc_metrics_lite->rmx_mtu = hc_entry->rmx_mtu; 432122922Sandre hc_metrics_lite->rmx_ssthresh = hc_entry->rmx_ssthresh; 433122922Sandre hc_metrics_lite->rmx_rtt = hc_entry->rmx_rtt; 434122922Sandre hc_metrics_lite->rmx_rttvar = hc_entry->rmx_rttvar; 435122922Sandre hc_metrics_lite->rmx_bandwidth = hc_entry->rmx_bandwidth; 436122922Sandre hc_metrics_lite->rmx_cwnd = hc_entry->rmx_cwnd; 437122922Sandre hc_metrics_lite->rmx_sendpipe = hc_entry->rmx_sendpipe; 438122922Sandre hc_metrics_lite->rmx_recvpipe = hc_entry->rmx_recvpipe; 439122922Sandre 440122922Sandre /* 441170030Srwatson * Unlock bucket row. 442122922Sandre */ 443122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 444122922Sandre} 445122922Sandre 446122922Sandre/* 447170030Srwatson * External function: look up an entry in the hostcache and return the 448170030Srwatson * discovered path MTU. Returns NULL if no entry is found or value is not 449138409Srwatson * set. 450122922Sandre */ 451122922Sandreu_long 452122922Sandretcp_hc_getmtu(struct in_conninfo *inc) 453122922Sandre{ 454122922Sandre struct hc_metrics *hc_entry; 455122922Sandre u_long mtu; 456122922Sandre 457122922Sandre hc_entry = tcp_hc_lookup(inc); 458122922Sandre if (hc_entry == NULL) { 459122922Sandre return 0; 460122922Sandre } 461122922Sandre hc_entry->rmx_hits++; 462181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 463122922Sandre 464122922Sandre mtu = hc_entry->rmx_mtu; 465122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 466122922Sandre return mtu; 467122922Sandre} 468122922Sandre 469122922Sandre/* 470170030Srwatson * External function: update the MTU value of an entry in the hostcache. 471122922Sandre * Creates a new entry if none was found. 472122922Sandre */ 473122922Sandrevoid 474122922Sandretcp_hc_updatemtu(struct in_conninfo *inc, u_long mtu) 475122922Sandre{ 476122922Sandre struct hc_metrics *hc_entry; 477122922Sandre 478122922Sandre /* 479170030Srwatson * Find the right bucket. 480122922Sandre */ 481122922Sandre hc_entry = tcp_hc_lookup(inc); 482122922Sandre 483122922Sandre /* 484170030Srwatson * If we don't have an existing object, try to insert a new one. 485122922Sandre */ 486122922Sandre if (hc_entry == NULL) { 487122922Sandre hc_entry = tcp_hc_insert(inc); 488122922Sandre if (hc_entry == NULL) 489122922Sandre return; 490122922Sandre } 491122922Sandre hc_entry->rmx_updates++; 492181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 493122922Sandre 494122922Sandre hc_entry->rmx_mtu = mtu; 495122922Sandre 496122922Sandre /* 497170030Srwatson * Put it upfront so we find it faster next time. 498122922Sandre */ 499122922Sandre TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 500122922Sandre TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 501122922Sandre 502122922Sandre /* 503170030Srwatson * Unlock bucket row. 504122922Sandre */ 505122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 506122922Sandre} 507122922Sandre 508122922Sandre/* 509170030Srwatson * External function: update the TCP metrics of an entry in the hostcache. 510122922Sandre * Creates a new entry if none was found. 511122922Sandre */ 512122922Sandrevoid 513122922Sandretcp_hc_update(struct in_conninfo *inc, struct hc_metrics_lite *hcml) 514122922Sandre{ 515122922Sandre struct hc_metrics *hc_entry; 516122922Sandre 517122922Sandre hc_entry = tcp_hc_lookup(inc); 518122922Sandre if (hc_entry == NULL) { 519122922Sandre hc_entry = tcp_hc_insert(inc); 520122922Sandre if (hc_entry == NULL) 521122922Sandre return; 522122922Sandre } 523122922Sandre hc_entry->rmx_updates++; 524181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 525122922Sandre 526122922Sandre if (hcml->rmx_rtt != 0) { 527122922Sandre if (hc_entry->rmx_rtt == 0) 528122922Sandre hc_entry->rmx_rtt = hcml->rmx_rtt; 529122922Sandre else 530122922Sandre hc_entry->rmx_rtt = 531122922Sandre (hc_entry->rmx_rtt + hcml->rmx_rtt) / 2; 532190948Srwatson TCPSTAT_INC(tcps_cachedrtt); 533122922Sandre } 534122922Sandre if (hcml->rmx_rttvar != 0) { 535122922Sandre if (hc_entry->rmx_rttvar == 0) 536133874Srwatson hc_entry->rmx_rttvar = hcml->rmx_rttvar; 537122922Sandre else 538122922Sandre hc_entry->rmx_rttvar = 539122922Sandre (hc_entry->rmx_rttvar + hcml->rmx_rttvar) / 2; 540190948Srwatson TCPSTAT_INC(tcps_cachedrttvar); 541122922Sandre } 542122922Sandre if (hcml->rmx_ssthresh != 0) { 543122922Sandre if (hc_entry->rmx_ssthresh == 0) 544122922Sandre hc_entry->rmx_ssthresh = hcml->rmx_ssthresh; 545122922Sandre else 546122922Sandre hc_entry->rmx_ssthresh = 547122922Sandre (hc_entry->rmx_ssthresh + hcml->rmx_ssthresh) / 2; 548190948Srwatson TCPSTAT_INC(tcps_cachedssthresh); 549122922Sandre } 550122922Sandre if (hcml->rmx_bandwidth != 0) { 551122922Sandre if (hc_entry->rmx_bandwidth == 0) 552122922Sandre hc_entry->rmx_bandwidth = hcml->rmx_bandwidth; 553122922Sandre else 554122922Sandre hc_entry->rmx_bandwidth = 555122922Sandre (hc_entry->rmx_bandwidth + hcml->rmx_bandwidth) / 2; 556190948Srwatson /* TCPSTAT_INC(tcps_cachedbandwidth); */ 557122922Sandre } 558122922Sandre if (hcml->rmx_cwnd != 0) { 559122922Sandre if (hc_entry->rmx_cwnd == 0) 560122922Sandre hc_entry->rmx_cwnd = hcml->rmx_cwnd; 561122922Sandre else 562122922Sandre hc_entry->rmx_cwnd = 563122922Sandre (hc_entry->rmx_cwnd + hcml->rmx_cwnd) / 2; 564190948Srwatson /* TCPSTAT_INC(tcps_cachedcwnd); */ 565122922Sandre } 566122922Sandre if (hcml->rmx_sendpipe != 0) { 567122922Sandre if (hc_entry->rmx_sendpipe == 0) 568122922Sandre hc_entry->rmx_sendpipe = hcml->rmx_sendpipe; 569122922Sandre else 570122922Sandre hc_entry->rmx_sendpipe = 571122922Sandre (hc_entry->rmx_sendpipe + hcml->rmx_sendpipe) /2; 572190948Srwatson /* TCPSTAT_INC(tcps_cachedsendpipe); */ 573133874Srwatson } 574122922Sandre if (hcml->rmx_recvpipe != 0) { 575122922Sandre if (hc_entry->rmx_recvpipe == 0) 576122922Sandre hc_entry->rmx_recvpipe = hcml->rmx_recvpipe; 577122922Sandre else 578122922Sandre hc_entry->rmx_recvpipe = 579122922Sandre (hc_entry->rmx_recvpipe + hcml->rmx_recvpipe) /2; 580190948Srwatson /* TCPSTAT_INC(tcps_cachedrecvpipe); */ 581122922Sandre } 582122922Sandre 583122922Sandre TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 584122922Sandre TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 585122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 586122922Sandre} 587122922Sandre 588122922Sandre/* 589122922Sandre * Sysctl function: prints the list and values of all hostcache entries in 590122922Sandre * unsorted order. 591122922Sandre */ 592122922Sandrestatic int 593122922Sandresysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS) 594122922Sandre{ 595122922Sandre int bufsize; 596122922Sandre int linesize = 128; 597122922Sandre char *p, *buf; 598122922Sandre int len, i, error; 599122922Sandre struct hc_metrics *hc_entry; 600165118Sbz#ifdef INET6 601165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 602165118Sbz#endif 603122922Sandre 604181803Sbz bufsize = linesize * (V_tcp_hostcache.cache_count + 1); 605122922Sandre 606122922Sandre p = buf = (char *)malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO); 607122922Sandre 608122922Sandre len = snprintf(p, linesize, 609122922Sandre "\nIP address MTU SSTRESH RTT RTTVAR BANDWIDTH " 610122922Sandre " CWND SENDPIPE RECVPIPE HITS UPD EXP\n"); 611122922Sandre p += len; 612122922Sandre 613122922Sandre#define msec(u) (((u) + 500) / 1000) 614181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 615181803Sbz THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 616181803Sbz TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket, 617122922Sandre rmx_q) { 618122922Sandre len = snprintf(p, linesize, 619122922Sandre "%-15s %5lu %8lu %6lums %6lums %9lu %8lu %8lu %8lu " 620122922Sandre "%4lu %4lu %4i\n", 621122922Sandre hc_entry->ip4.s_addr ? inet_ntoa(hc_entry->ip4) : 622122922Sandre#ifdef INET6 623165118Sbz ip6_sprintf(ip6buf, &hc_entry->ip6), 624122922Sandre#else 625122922Sandre "IPv6?", 626122922Sandre#endif 627122922Sandre hc_entry->rmx_mtu, 628122922Sandre hc_entry->rmx_ssthresh, 629122922Sandre msec(hc_entry->rmx_rtt * 630122922Sandre (RTM_RTTUNIT / (hz * TCP_RTT_SCALE))), 631122922Sandre msec(hc_entry->rmx_rttvar * 632238083Strociny (RTM_RTTUNIT / (hz * TCP_RTTVAR_SCALE))), 633133477Sandre hc_entry->rmx_bandwidth * 8, 634122922Sandre hc_entry->rmx_cwnd, 635122922Sandre hc_entry->rmx_sendpipe, 636122922Sandre hc_entry->rmx_recvpipe, 637122922Sandre hc_entry->rmx_hits, 638122922Sandre hc_entry->rmx_updates, 639122922Sandre hc_entry->rmx_expire); 640122922Sandre p += len; 641122922Sandre } 642181803Sbz THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 643122922Sandre } 644122922Sandre#undef msec 645122922Sandre error = SYSCTL_OUT(req, buf, p - buf); 646122922Sandre free(buf, M_TEMP); 647122922Sandre return(error); 648122922Sandre} 649122922Sandre 650122922Sandre/* 651203724Sbz * Caller has to make sure the curvnet is set properly. 652122922Sandre */ 653122922Sandrestatic void 654203724Sbztcp_hc_purge_internal(int all) 655122922Sandre{ 656128574Sandre struct hc_metrics *hc_entry, *hc_next; 657122922Sandre int i; 658122922Sandre 659181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 660181803Sbz THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 661181887Sjulian TAILQ_FOREACH_SAFE(hc_entry, 662181888Sjulian &V_tcp_hostcache.hashbase[i].hch_bucket, rmx_q, hc_next) { 663122922Sandre if (all || hc_entry->rmx_expire <= 0) { 664181803Sbz TAILQ_REMOVE(&V_tcp_hostcache.hashbase[i].hch_bucket, 665122922Sandre hc_entry, rmx_q); 666181803Sbz uma_zfree(V_tcp_hostcache.zone, hc_entry); 667181803Sbz V_tcp_hostcache.hashbase[i].hch_length--; 668181803Sbz V_tcp_hostcache.cache_count--; 669122922Sandre } else 670181803Sbz hc_entry->rmx_expire -= V_tcp_hostcache.prune; 671122922Sandre } 672181803Sbz THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 673122922Sandre } 674203724Sbz} 675181887Sjulian 676203724Sbz/* 677203724Sbz * Expire and purge (old|all) entries in the tcp_hostcache. Runs 678203724Sbz * periodically from the callout. 679203724Sbz */ 680203724Sbzstatic void 681203724Sbztcp_hc_purge(void *arg) 682203724Sbz{ 683203724Sbz CURVNET_SET((struct vnet *) arg); 684203724Sbz int all = 0; 685203724Sbz 686203724Sbz if (V_tcp_hostcache.purgeall) { 687203724Sbz all = 1; 688203724Sbz V_tcp_hostcache.purgeall = 0; 689203724Sbz } 690203724Sbz 691203724Sbz tcp_hc_purge_internal(all); 692203724Sbz 693181887Sjulian callout_reset(&V_tcp_hc_callout, V_tcp_hostcache.prune * hz, 694181887Sjulian tcp_hc_purge, arg); 695191816Szec CURVNET_RESTORE(); 696122922Sandre} 697