tcp_hostcache.c revision 182633
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: head/sys/netinet/tcp_hostcache.c 182633 2008-09-01 19:25:27Z brooks $"); 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> 79181803Sbz#include <sys/vimage.h> 80122922Sandre 81122922Sandre#include <net/if.h> 82122922Sandre 83122922Sandre#include <netinet/in.h> 84122922Sandre#include <netinet/in_systm.h> 85122922Sandre#include <netinet/ip.h> 86122922Sandre#include <netinet/in_var.h> 87122922Sandre#include <netinet/in_pcb.h> 88122922Sandre#include <netinet/ip_var.h> 89122922Sandre#ifdef INET6 90122922Sandre#include <netinet/ip6.h> 91122922Sandre#include <netinet6/ip6_var.h> 92122922Sandre#endif 93122922Sandre#include <netinet/tcp.h> 94122922Sandre#include <netinet/tcp_var.h> 95122922Sandre#ifdef INET6 96122922Sandre#include <netinet6/tcp6_var.h> 97122922Sandre#endif 98122922Sandre 99122922Sandre#include <vm/uma.h> 100122922Sandre 101122922Sandre 102122922SandreTAILQ_HEAD(hc_qhead, hc_metrics); 103122922Sandre 104122922Sandrestruct hc_head { 105122922Sandre struct hc_qhead hch_bucket; 106122922Sandre u_int hch_length; 107122922Sandre struct mtx hch_mtx; 108122922Sandre}; 109122922Sandre 110122922Sandrestruct hc_metrics { 111122922Sandre /* housekeeping */ 112122922Sandre TAILQ_ENTRY(hc_metrics) rmx_q; 113122922Sandre struct hc_head *rmx_head; /* head of bucket tail queue */ 114122922Sandre struct in_addr ip4; /* IP address */ 115122922Sandre struct in6_addr ip6; /* IP6 address */ 116170030Srwatson /* endpoint specific values for TCP */ 117122922Sandre u_long rmx_mtu; /* MTU for this path */ 118122922Sandre u_long rmx_ssthresh; /* outbound gateway buffer limit */ 119122922Sandre u_long rmx_rtt; /* estimated round trip time */ 120122922Sandre u_long rmx_rttvar; /* estimated rtt variance */ 121122922Sandre u_long rmx_bandwidth; /* estimated bandwidth */ 122122922Sandre u_long rmx_cwnd; /* congestion window */ 123122922Sandre u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 124122922Sandre u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 125170030Srwatson /* TCP hostcache internal data */ 126122922Sandre int rmx_expire; /* lifetime for object */ 127122922Sandre u_long rmx_hits; /* number of hits */ 128122922Sandre u_long rmx_updates; /* number of updates */ 129122922Sandre}; 130122922Sandre 131122922Sandre/* Arbitrary values */ 132122922Sandre#define TCP_HOSTCACHE_HASHSIZE 512 133122922Sandre#define TCP_HOSTCACHE_BUCKETLIMIT 30 134122922Sandre#define TCP_HOSTCACHE_EXPIRE 60*60 /* one hour */ 135122922Sandre#define TCP_HOSTCACHE_PRUNE 5*60 /* every 5 minutes */ 136122922Sandre 137122922Sandrestruct tcp_hostcache { 138122922Sandre struct hc_head *hashbase; 139122922Sandre uma_zone_t zone; 140122922Sandre u_int hashsize; 141122922Sandre u_int hashmask; 142122922Sandre u_int bucket_limit; 143122922Sandre u_int cache_count; 144122922Sandre u_int cache_limit; 145122922Sandre int expire; 146170434Syar int prune; 147122922Sandre int purgeall; 148122922Sandre}; 149122922Sandrestatic struct tcp_hostcache tcp_hostcache; 150122922Sandre 151122922Sandrestatic struct callout tcp_hc_callout; 152122922Sandre 153122922Sandrestatic struct hc_metrics *tcp_hc_lookup(struct in_conninfo *); 154122922Sandrestatic struct hc_metrics *tcp_hc_insert(struct in_conninfo *); 155122922Sandrestatic int sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS); 156122922Sandrestatic void tcp_hc_purge(void *); 157122922Sandre 158182633SbrooksSYSCTL_NODE(_net_inet_tcp, OID_AUTO, hostcache, CTLFLAG_RW, 0, 159182633Sbrooks "TCP Host cache"); 160122922Sandre 161122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, cachelimit, CTLFLAG_RDTUN, 162167784Sandre &tcp_hostcache.cache_limit, 0, "Overall entry limit for hostcache"); 163122922Sandre 164122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, hashsize, CTLFLAG_RDTUN, 165167784Sandre &tcp_hostcache.hashsize, 0, "Size of TCP hostcache hashtable"); 166122922Sandre 167122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, bucketlimit, CTLFLAG_RDTUN, 168167784Sandre &tcp_hostcache.bucket_limit, 0, "Per-bucket hash limit for hostcache"); 169122922Sandre 170122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, count, CTLFLAG_RD, 171167784Sandre &tcp_hostcache.cache_count, 0, "Current number of entries in hostcache"); 172122922Sandre 173122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, expire, CTLFLAG_RW, 174167784Sandre &tcp_hostcache.expire, 0, "Expire time of TCP hostcache entries"); 175122922Sandre 176170434SyarSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, prune, CTLFLAG_RW, 177170434Syar &tcp_hostcache.prune, 0, "Time between purge runs"); 178170434Syar 179122922SandreSYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, purge, CTLFLAG_RW, 180167784Sandre &tcp_hostcache.purgeall, 0, "Expire all entires on next purge run"); 181122922Sandre 182122922SandreSYSCTL_PROC(_net_inet_tcp_hostcache, OID_AUTO, list, 183167784Sandre CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP, 0, 0, 184167784Sandre sysctl_tcp_hc_list, "A", "List of all hostcache entries"); 185122922Sandre 186122922Sandre 187122922Sandrestatic MALLOC_DEFINE(M_HOSTCACHE, "hostcache", "TCP hostcache"); 188122922Sandre 189122922Sandre#define HOSTCACHE_HASH(ip) \ 190133874Srwatson (((ip)->s_addr ^ ((ip)->s_addr >> 7) ^ ((ip)->s_addr >> 17)) & \ 191181803Sbz V_tcp_hostcache.hashmask) 192122922Sandre 193122922Sandre/* XXX: What is the recommended hash to get good entropy for IPv6 addresses? */ 194133874Srwatson#define HOSTCACHE_HASH6(ip6) \ 195122922Sandre (((ip6)->s6_addr32[0] ^ \ 196122922Sandre (ip6)->s6_addr32[1] ^ \ 197122922Sandre (ip6)->s6_addr32[2] ^ \ 198122922Sandre (ip6)->s6_addr32[3]) & \ 199181803Sbz V_tcp_hostcache.hashmask) 200122922Sandre 201122922Sandre#define THC_LOCK(lp) mtx_lock(lp) 202122922Sandre#define THC_UNLOCK(lp) mtx_unlock(lp) 203122922Sandre 204122922Sandrevoid 205122922Sandretcp_hc_init(void) 206122922Sandre{ 207122922Sandre int i; 208122922Sandre 209122922Sandre /* 210170030Srwatson * Initialize hostcache structures. 211122922Sandre */ 212181803Sbz V_tcp_hostcache.cache_count = 0; 213181803Sbz V_tcp_hostcache.hashsize = TCP_HOSTCACHE_HASHSIZE; 214181803Sbz V_tcp_hostcache.bucket_limit = TCP_HOSTCACHE_BUCKETLIMIT; 215181803Sbz V_tcp_hostcache.cache_limit = 216181803Sbz V_tcp_hostcache.hashsize * V_tcp_hostcache.bucket_limit; 217181803Sbz V_tcp_hostcache.expire = TCP_HOSTCACHE_EXPIRE; 218181803Sbz V_tcp_hostcache.prune = TCP_HOSTCACHE_PRUNE; 219122922Sandre 220133874Srwatson TUNABLE_INT_FETCH("net.inet.tcp.hostcache.hashsize", 221181803Sbz &V_tcp_hostcache.hashsize); 222133874Srwatson TUNABLE_INT_FETCH("net.inet.tcp.hostcache.cachelimit", 223181803Sbz &V_tcp_hostcache.cache_limit); 224133874Srwatson TUNABLE_INT_FETCH("net.inet.tcp.hostcache.bucketlimit", 225181803Sbz &V_tcp_hostcache.bucket_limit); 226181803Sbz if (!powerof2(V_tcp_hostcache.hashsize)) { 227133874Srwatson printf("WARNING: hostcache hash size is not a power of 2.\n"); 228181803Sbz V_tcp_hostcache.hashsize = TCP_HOSTCACHE_HASHSIZE; /* default */ 229133874Srwatson } 230181803Sbz V_tcp_hostcache.hashmask = V_tcp_hostcache.hashsize - 1; 231122922Sandre 232122922Sandre /* 233170030Srwatson * Allocate the hash table. 234122922Sandre */ 235181803Sbz V_tcp_hostcache.hashbase = (struct hc_head *) 236181803Sbz malloc(V_tcp_hostcache.hashsize * sizeof(struct hc_head), 237122922Sandre M_HOSTCACHE, M_WAITOK | M_ZERO); 238122922Sandre 239122922Sandre /* 240170030Srwatson * Initialize the hash buckets. 241122922Sandre */ 242181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 243181803Sbz TAILQ_INIT(&V_tcp_hostcache.hashbase[i].hch_bucket); 244181803Sbz V_tcp_hostcache.hashbase[i].hch_length = 0; 245181803Sbz mtx_init(&V_tcp_hostcache.hashbase[i].hch_mtx, "tcp_hc_entry", 246122922Sandre NULL, MTX_DEF); 247122922Sandre } 248122922Sandre 249122922Sandre /* 250122922Sandre * Allocate the hostcache entries. 251122922Sandre */ 252181887Sjulian V_tcp_hostcache.zone = 253181888Sjulian uma_zcreate("hostcache", sizeof(struct hc_metrics), 254181888Sjulian NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 255181803Sbz uma_zone_set_max(V_tcp_hostcache.zone, V_tcp_hostcache.cache_limit); 256122922Sandre 257122922Sandre /* 258122922Sandre * Set up periodic cache cleanup. 259122922Sandre */ 260181803Sbz callout_init(&V_tcp_hc_callout, CALLOUT_MPSAFE); 261181887Sjulian callout_reset(&V_tcp_hc_callout, V_tcp_hostcache.prune * hz, 262181887Sjulian tcp_hc_purge, 0); 263122922Sandre} 264122922Sandre 265122922Sandre/* 266170030Srwatson * Internal function: look up an entry in the hostcache or return NULL. 267122922Sandre * 268122922Sandre * If an entry has been returned, the caller becomes responsible for 269122922Sandre * unlocking the bucket row after he is done reading/modifying the entry. 270122922Sandre */ 271122922Sandrestatic struct hc_metrics * 272122922Sandretcp_hc_lookup(struct in_conninfo *inc) 273122922Sandre{ 274122922Sandre int hash; 275122922Sandre struct hc_head *hc_head; 276122922Sandre struct hc_metrics *hc_entry; 277122922Sandre 278122922Sandre KASSERT(inc != NULL, ("tcp_hc_lookup with NULL in_conninfo pointer")); 279122922Sandre 280122922Sandre /* 281122922Sandre * Hash the foreign ip address. 282122922Sandre */ 283122922Sandre if (inc->inc_isipv6) 284122922Sandre hash = HOSTCACHE_HASH6(&inc->inc6_faddr); 285122922Sandre else 286122922Sandre hash = HOSTCACHE_HASH(&inc->inc_faddr); 287122922Sandre 288181803Sbz hc_head = &V_tcp_hostcache.hashbase[hash]; 289122922Sandre 290122922Sandre /* 291170030Srwatson * Acquire lock for this bucket row; we release the lock if we don't 292170030Srwatson * find an entry, otherwise the caller has to unlock after he is 293170030Srwatson * done. 294122922Sandre */ 295122922Sandre THC_LOCK(&hc_head->hch_mtx); 296122922Sandre 297122922Sandre /* 298170030Srwatson * Iterate through entries in bucket row looking for a match. 299122922Sandre */ 300122922Sandre TAILQ_FOREACH(hc_entry, &hc_head->hch_bucket, rmx_q) { 301122922Sandre if (inc->inc_isipv6) { 302122922Sandre if (memcmp(&inc->inc6_faddr, &hc_entry->ip6, 303122922Sandre sizeof(inc->inc6_faddr)) == 0) 304122922Sandre return hc_entry; 305122922Sandre } else { 306122922Sandre if (memcmp(&inc->inc_faddr, &hc_entry->ip4, 307122922Sandre sizeof(inc->inc_faddr)) == 0) 308122922Sandre return hc_entry; 309122922Sandre } 310122922Sandre } 311122922Sandre 312122922Sandre /* 313170030Srwatson * We were unsuccessful and didn't find anything. 314122922Sandre */ 315122922Sandre THC_UNLOCK(&hc_head->hch_mtx); 316122922Sandre return NULL; 317122922Sandre} 318122922Sandre 319122922Sandre/* 320170030Srwatson * Internal function: insert an entry into the hostcache or return NULL if 321170030Srwatson * unable to allocate a new one. 322133874Srwatson * 323122922Sandre * If an entry has been returned, the caller becomes responsible for 324122922Sandre * unlocking the bucket row after he is done reading/modifying the entry. 325122922Sandre */ 326122922Sandrestatic struct hc_metrics * 327122922Sandretcp_hc_insert(struct in_conninfo *inc) 328122922Sandre{ 329122922Sandre int hash; 330122922Sandre struct hc_head *hc_head; 331122922Sandre struct hc_metrics *hc_entry; 332122922Sandre 333122922Sandre KASSERT(inc != NULL, ("tcp_hc_insert with NULL in_conninfo pointer")); 334122922Sandre 335122922Sandre /* 336170030Srwatson * Hash the foreign ip address. 337122922Sandre */ 338122922Sandre if (inc->inc_isipv6) 339122922Sandre hash = HOSTCACHE_HASH6(&inc->inc6_faddr); 340122922Sandre else 341122922Sandre hash = HOSTCACHE_HASH(&inc->inc_faddr); 342122922Sandre 343181803Sbz hc_head = &V_tcp_hostcache.hashbase[hash]; 344122922Sandre 345122922Sandre /* 346170030Srwatson * Acquire lock for this bucket row; we release the lock if we don't 347170030Srwatson * find an entry, otherwise the caller has to unlock after he is 348170030Srwatson * done. 349122922Sandre */ 350122922Sandre THC_LOCK(&hc_head->hch_mtx); 351122922Sandre 352122922Sandre /* 353170030Srwatson * If the bucket limit is reached, reuse the least-used element. 354122922Sandre */ 355181803Sbz if (hc_head->hch_length >= V_tcp_hostcache.bucket_limit || 356181803Sbz V_tcp_hostcache.cache_count >= V_tcp_hostcache.cache_limit) { 357122922Sandre hc_entry = TAILQ_LAST(&hc_head->hch_bucket, hc_qhead); 358122922Sandre /* 359122922Sandre * At first we were dropping the last element, just to 360170030Srwatson * reacquire it in the next two lines again, which isn't very 361170030Srwatson * efficient. Instead just reuse the least used element. 362170030Srwatson * We may drop something that is still "in-use" but we can be 363170030Srwatson * "lossy". 364170405Sandre * Just give up if this bucket row is empty and we don't have 365170405Sandre * anything to replace. 366122922Sandre */ 367170405Sandre if (hc_entry == NULL) { 368170405Sandre THC_UNLOCK(&hc_head->hch_mtx); 369170405Sandre return NULL; 370170405Sandre } 371122922Sandre TAILQ_REMOVE(&hc_head->hch_bucket, hc_entry, rmx_q); 372181803Sbz V_tcp_hostcache.hashbase[hash].hch_length--; 373181803Sbz V_tcp_hostcache.cache_count--; 374181803Sbz V_tcpstat.tcps_hc_bucketoverflow++; 375123028Sandre#if 0 376181803Sbz uma_zfree(V_tcp_hostcache.zone, hc_entry); 377122922Sandre#endif 378122922Sandre } else { 379122922Sandre /* 380170030Srwatson * Allocate a new entry, or balk if not possible. 381122922Sandre */ 382181803Sbz hc_entry = uma_zalloc(V_tcp_hostcache.zone, M_NOWAIT); 383122922Sandre if (hc_entry == NULL) { 384122922Sandre THC_UNLOCK(&hc_head->hch_mtx); 385122922Sandre return NULL; 386122922Sandre } 387122922Sandre } 388122922Sandre 389122922Sandre /* 390170030Srwatson * Initialize basic information of hostcache entry. 391122922Sandre */ 392122922Sandre bzero(hc_entry, sizeof(*hc_entry)); 393122922Sandre if (inc->inc_isipv6) 394123113Sandre bcopy(&inc->inc6_faddr, &hc_entry->ip6, sizeof(hc_entry->ip6)); 395122922Sandre else 396122922Sandre hc_entry->ip4 = inc->inc_faddr; 397122922Sandre hc_entry->rmx_head = hc_head; 398181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; 399122922Sandre 400122922Sandre /* 401170030Srwatson * Put it upfront. 402122922Sandre */ 403122922Sandre TAILQ_INSERT_HEAD(&hc_head->hch_bucket, hc_entry, rmx_q); 404181803Sbz V_tcp_hostcache.hashbase[hash].hch_length++; 405181803Sbz V_tcp_hostcache.cache_count++; 406181803Sbz V_tcpstat.tcps_hc_added++; 407122922Sandre 408122922Sandre return hc_entry; 409122922Sandre} 410122922Sandre 411122922Sandre/* 412170030Srwatson * External function: look up an entry in the hostcache and fill out the 413170030Srwatson * supplied TCP metrics structure. Fills in NULL when no entry was found or 414170030Srwatson * a value is not set. 415122922Sandre */ 416122922Sandrevoid 417122922Sandretcp_hc_get(struct in_conninfo *inc, struct hc_metrics_lite *hc_metrics_lite) 418122922Sandre{ 419122922Sandre struct hc_metrics *hc_entry; 420122922Sandre 421122922Sandre /* 422170030Srwatson * Find the right bucket. 423122922Sandre */ 424122922Sandre hc_entry = tcp_hc_lookup(inc); 425122922Sandre 426122922Sandre /* 427170030Srwatson * If we don't have an existing object. 428122922Sandre */ 429122922Sandre if (hc_entry == NULL) { 430122922Sandre bzero(hc_metrics_lite, sizeof(*hc_metrics_lite)); 431122922Sandre return; 432122922Sandre } 433122922Sandre hc_entry->rmx_hits++; 434181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 435122922Sandre 436122922Sandre hc_metrics_lite->rmx_mtu = hc_entry->rmx_mtu; 437122922Sandre hc_metrics_lite->rmx_ssthresh = hc_entry->rmx_ssthresh; 438122922Sandre hc_metrics_lite->rmx_rtt = hc_entry->rmx_rtt; 439122922Sandre hc_metrics_lite->rmx_rttvar = hc_entry->rmx_rttvar; 440122922Sandre hc_metrics_lite->rmx_bandwidth = hc_entry->rmx_bandwidth; 441122922Sandre hc_metrics_lite->rmx_cwnd = hc_entry->rmx_cwnd; 442122922Sandre hc_metrics_lite->rmx_sendpipe = hc_entry->rmx_sendpipe; 443122922Sandre hc_metrics_lite->rmx_recvpipe = hc_entry->rmx_recvpipe; 444122922Sandre 445122922Sandre /* 446170030Srwatson * Unlock bucket row. 447122922Sandre */ 448122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 449122922Sandre} 450122922Sandre 451122922Sandre/* 452170030Srwatson * External function: look up an entry in the hostcache and return the 453170030Srwatson * discovered path MTU. Returns NULL if no entry is found or value is not 454138409Srwatson * set. 455122922Sandre */ 456122922Sandreu_long 457122922Sandretcp_hc_getmtu(struct in_conninfo *inc) 458122922Sandre{ 459122922Sandre struct hc_metrics *hc_entry; 460122922Sandre u_long mtu; 461122922Sandre 462122922Sandre hc_entry = tcp_hc_lookup(inc); 463122922Sandre if (hc_entry == NULL) { 464122922Sandre return 0; 465122922Sandre } 466122922Sandre hc_entry->rmx_hits++; 467181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 468122922Sandre 469122922Sandre mtu = hc_entry->rmx_mtu; 470122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 471122922Sandre return mtu; 472122922Sandre} 473122922Sandre 474122922Sandre/* 475170030Srwatson * External function: update the MTU value of an entry in the hostcache. 476122922Sandre * Creates a new entry if none was found. 477122922Sandre */ 478122922Sandrevoid 479122922Sandretcp_hc_updatemtu(struct in_conninfo *inc, u_long mtu) 480122922Sandre{ 481122922Sandre struct hc_metrics *hc_entry; 482122922Sandre 483122922Sandre /* 484170030Srwatson * Find the right bucket. 485122922Sandre */ 486122922Sandre hc_entry = tcp_hc_lookup(inc); 487122922Sandre 488122922Sandre /* 489170030Srwatson * If we don't have an existing object, try to insert a new one. 490122922Sandre */ 491122922Sandre if (hc_entry == NULL) { 492122922Sandre hc_entry = tcp_hc_insert(inc); 493122922Sandre if (hc_entry == NULL) 494122922Sandre return; 495122922Sandre } 496122922Sandre hc_entry->rmx_updates++; 497181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 498122922Sandre 499122922Sandre hc_entry->rmx_mtu = mtu; 500122922Sandre 501122922Sandre /* 502170030Srwatson * Put it upfront so we find it faster next time. 503122922Sandre */ 504122922Sandre TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 505122922Sandre TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 506122922Sandre 507122922Sandre /* 508170030Srwatson * Unlock bucket row. 509122922Sandre */ 510122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 511122922Sandre} 512122922Sandre 513122922Sandre/* 514170030Srwatson * External function: update the TCP metrics of an entry in the hostcache. 515122922Sandre * Creates a new entry if none was found. 516122922Sandre */ 517122922Sandrevoid 518122922Sandretcp_hc_update(struct in_conninfo *inc, struct hc_metrics_lite *hcml) 519122922Sandre{ 520122922Sandre struct hc_metrics *hc_entry; 521122922Sandre 522122922Sandre hc_entry = tcp_hc_lookup(inc); 523122922Sandre if (hc_entry == NULL) { 524122922Sandre hc_entry = tcp_hc_insert(inc); 525122922Sandre if (hc_entry == NULL) 526122922Sandre return; 527122922Sandre } 528122922Sandre hc_entry->rmx_updates++; 529181803Sbz hc_entry->rmx_expire = V_tcp_hostcache.expire; /* start over again */ 530122922Sandre 531122922Sandre if (hcml->rmx_rtt != 0) { 532122922Sandre if (hc_entry->rmx_rtt == 0) 533122922Sandre hc_entry->rmx_rtt = hcml->rmx_rtt; 534122922Sandre else 535122922Sandre hc_entry->rmx_rtt = 536122922Sandre (hc_entry->rmx_rtt + hcml->rmx_rtt) / 2; 537181803Sbz V_tcpstat.tcps_cachedrtt++; 538122922Sandre } 539122922Sandre if (hcml->rmx_rttvar != 0) { 540122922Sandre if (hc_entry->rmx_rttvar == 0) 541133874Srwatson hc_entry->rmx_rttvar = hcml->rmx_rttvar; 542122922Sandre else 543122922Sandre hc_entry->rmx_rttvar = 544122922Sandre (hc_entry->rmx_rttvar + hcml->rmx_rttvar) / 2; 545181803Sbz V_tcpstat.tcps_cachedrttvar++; 546122922Sandre } 547122922Sandre if (hcml->rmx_ssthresh != 0) { 548122922Sandre if (hc_entry->rmx_ssthresh == 0) 549122922Sandre hc_entry->rmx_ssthresh = hcml->rmx_ssthresh; 550122922Sandre else 551122922Sandre hc_entry->rmx_ssthresh = 552122922Sandre (hc_entry->rmx_ssthresh + hcml->rmx_ssthresh) / 2; 553181803Sbz V_tcpstat.tcps_cachedssthresh++; 554122922Sandre } 555122922Sandre if (hcml->rmx_bandwidth != 0) { 556122922Sandre if (hc_entry->rmx_bandwidth == 0) 557122922Sandre hc_entry->rmx_bandwidth = hcml->rmx_bandwidth; 558122922Sandre else 559122922Sandre hc_entry->rmx_bandwidth = 560122922Sandre (hc_entry->rmx_bandwidth + hcml->rmx_bandwidth) / 2; 561181803Sbz /* V_tcpstat.tcps_cachedbandwidth++; */ 562122922Sandre } 563122922Sandre if (hcml->rmx_cwnd != 0) { 564122922Sandre if (hc_entry->rmx_cwnd == 0) 565122922Sandre hc_entry->rmx_cwnd = hcml->rmx_cwnd; 566122922Sandre else 567122922Sandre hc_entry->rmx_cwnd = 568122922Sandre (hc_entry->rmx_cwnd + hcml->rmx_cwnd) / 2; 569181803Sbz /* V_tcpstat.tcps_cachedcwnd++; */ 570122922Sandre } 571122922Sandre if (hcml->rmx_sendpipe != 0) { 572122922Sandre if (hc_entry->rmx_sendpipe == 0) 573122922Sandre hc_entry->rmx_sendpipe = hcml->rmx_sendpipe; 574122922Sandre else 575122922Sandre hc_entry->rmx_sendpipe = 576122922Sandre (hc_entry->rmx_sendpipe + hcml->rmx_sendpipe) /2; 577181803Sbz /* V_tcpstat.tcps_cachedsendpipe++; */ 578133874Srwatson } 579122922Sandre if (hcml->rmx_recvpipe != 0) { 580122922Sandre if (hc_entry->rmx_recvpipe == 0) 581122922Sandre hc_entry->rmx_recvpipe = hcml->rmx_recvpipe; 582122922Sandre else 583122922Sandre hc_entry->rmx_recvpipe = 584122922Sandre (hc_entry->rmx_recvpipe + hcml->rmx_recvpipe) /2; 585181803Sbz /* V_tcpstat.tcps_cachedrecvpipe++; */ 586122922Sandre } 587122922Sandre 588122922Sandre TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 589122922Sandre TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q); 590122922Sandre THC_UNLOCK(&hc_entry->rmx_head->hch_mtx); 591122922Sandre} 592122922Sandre 593122922Sandre/* 594122922Sandre * Sysctl function: prints the list and values of all hostcache entries in 595122922Sandre * unsorted order. 596122922Sandre */ 597122922Sandrestatic int 598122922Sandresysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS) 599122922Sandre{ 600122922Sandre int bufsize; 601122922Sandre int linesize = 128; 602122922Sandre char *p, *buf; 603122922Sandre int len, i, error; 604122922Sandre struct hc_metrics *hc_entry; 605165118Sbz#ifdef INET6 606165118Sbz char ip6buf[INET6_ADDRSTRLEN]; 607165118Sbz#endif 608122922Sandre 609181803Sbz bufsize = linesize * (V_tcp_hostcache.cache_count + 1); 610122922Sandre 611122922Sandre p = buf = (char *)malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO); 612122922Sandre 613122922Sandre len = snprintf(p, linesize, 614122922Sandre "\nIP address MTU SSTRESH RTT RTTVAR BANDWIDTH " 615122922Sandre " CWND SENDPIPE RECVPIPE HITS UPD EXP\n"); 616122922Sandre p += len; 617122922Sandre 618122922Sandre#define msec(u) (((u) + 500) / 1000) 619181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 620181803Sbz THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 621181803Sbz TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket, 622122922Sandre rmx_q) { 623122922Sandre len = snprintf(p, linesize, 624122922Sandre "%-15s %5lu %8lu %6lums %6lums %9lu %8lu %8lu %8lu " 625122922Sandre "%4lu %4lu %4i\n", 626122922Sandre hc_entry->ip4.s_addr ? inet_ntoa(hc_entry->ip4) : 627122922Sandre#ifdef INET6 628165118Sbz ip6_sprintf(ip6buf, &hc_entry->ip6), 629122922Sandre#else 630122922Sandre "IPv6?", 631122922Sandre#endif 632122922Sandre hc_entry->rmx_mtu, 633122922Sandre hc_entry->rmx_ssthresh, 634122922Sandre msec(hc_entry->rmx_rtt * 635122922Sandre (RTM_RTTUNIT / (hz * TCP_RTT_SCALE))), 636122922Sandre msec(hc_entry->rmx_rttvar * 637122922Sandre (RTM_RTTUNIT / (hz * TCP_RTT_SCALE))), 638133477Sandre hc_entry->rmx_bandwidth * 8, 639122922Sandre hc_entry->rmx_cwnd, 640122922Sandre hc_entry->rmx_sendpipe, 641122922Sandre hc_entry->rmx_recvpipe, 642122922Sandre hc_entry->rmx_hits, 643122922Sandre hc_entry->rmx_updates, 644122922Sandre hc_entry->rmx_expire); 645122922Sandre p += len; 646122922Sandre } 647181803Sbz THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 648122922Sandre } 649122922Sandre#undef msec 650122922Sandre error = SYSCTL_OUT(req, buf, p - buf); 651122922Sandre free(buf, M_TEMP); 652122922Sandre return(error); 653122922Sandre} 654122922Sandre 655122922Sandre/* 656170030Srwatson * Expire and purge (old|all) entries in the tcp_hostcache. Runs 657170030Srwatson * periodically from the callout. 658122922Sandre */ 659122922Sandrestatic void 660122922Sandretcp_hc_purge(void *arg) 661122922Sandre{ 662128574Sandre struct hc_metrics *hc_entry, *hc_next; 663122922Sandre int all = (intptr_t)arg; 664122922Sandre int i; 665122922Sandre 666181803Sbz if (V_tcp_hostcache.purgeall) { 667122922Sandre all = 1; 668181803Sbz V_tcp_hostcache.purgeall = 0; 669122922Sandre } 670122922Sandre 671181803Sbz for (i = 0; i < V_tcp_hostcache.hashsize; i++) { 672181803Sbz THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 673181887Sjulian TAILQ_FOREACH_SAFE(hc_entry, 674181888Sjulian &V_tcp_hostcache.hashbase[i].hch_bucket, rmx_q, hc_next) { 675122922Sandre if (all || hc_entry->rmx_expire <= 0) { 676181803Sbz TAILQ_REMOVE(&V_tcp_hostcache.hashbase[i].hch_bucket, 677122922Sandre hc_entry, rmx_q); 678181803Sbz uma_zfree(V_tcp_hostcache.zone, hc_entry); 679181803Sbz V_tcp_hostcache.hashbase[i].hch_length--; 680181803Sbz V_tcp_hostcache.cache_count--; 681122922Sandre } else 682181803Sbz hc_entry->rmx_expire -= V_tcp_hostcache.prune; 683122922Sandre } 684181803Sbz THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx); 685122922Sandre } 686181887Sjulian 687181887Sjulian callout_reset(&V_tcp_hc_callout, V_tcp_hostcache.prune * hz, 688181887Sjulian tcp_hc_purge, arg); 689122922Sandre} 690