cd6c4060c8
When the hostcache bucket limit is reached the last bucket wasn't removed from the bucket row but inserted a few lines later at the bucket row head again. This leads to infinite loop when the same bucket row is accessed the next time for a lookup/insert or purge action. Tested by: imp, Matt Smith Approved by: re (rwatson)
729 lines
21 KiB
C
729 lines
21 KiB
C
/*
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* Copyright (c) 2002 Andre Oppermann, Internet Business Solutions AG
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* The tcp_hostcache moves the tcp specific cached metrics from the routing
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* table into a dedicated structure indexed by the remote IP address. It
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* keeps information on the measured tcp parameters of past tcp sessions
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* to have better initial start values for following connections from the
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* same source. Depending on the network parameters (delay, bandwidth, max
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* MTU, congestion window) between local and remote site this can lead to
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* significant speedups for new tcp connections after the first one.
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*
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* Due to this new tcp_hostcache all tcp specific metrics information in
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* the routing table has been removed. The INPCB no longer keeps a pointer
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* to the routing entry and protocol initiated route cloning has been
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* removed as well. With these changes the routing table has gone back
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* to being more lightwight and only carries information related to packet
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* forwarding.
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*
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* Tcp_hostcache is designed for multiple concurrent access in SMP
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* environments and high contention. All bucket rows have their own
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* lock and thus multiple lookups and modifies can be done at the same
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* time as long as they are in different bucket rows. If a request for
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* insertion of a new record can't be satisfied it simply returns an
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* empty structure. Nobody and nothing shall ever point directly to
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* any entry in tcp_hostcache. All communication is done in an object
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* oriented way and only funtions of tcp_hostcache will manipulate hostcache
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* entries. Otherwise we are unable to achieve good behaviour in concurrent
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* access situations. Since tcp_hostcache is only caching information there
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* are no fatal consequences if we either can't satisfy any particular request
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* or have to drop/overwrite an existing entry because of bucket limit
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* memory constrains.
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*/
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/*
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* Many thanks to jlemon for basic structure of tcp_syncache which is being
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* followed here.
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*/
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet/tcp.h>
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#include <netinet/tcp_var.h>
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#ifdef INET6
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#include <netinet6/tcp6_var.h>
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#endif
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#include <vm/uma.h>
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TAILQ_HEAD(hc_qhead, hc_metrics);
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struct hc_head {
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struct hc_qhead hch_bucket;
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u_int hch_length;
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struct mtx hch_mtx;
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};
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struct hc_metrics {
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/* housekeeping */
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TAILQ_ENTRY(hc_metrics) rmx_q;
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struct hc_head *rmx_head; /* head of bucket tail queue */
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struct in_addr ip4; /* IP address */
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struct in6_addr ip6; /* IP6 address */
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/* endpoint specific values for tcp */
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u_long rmx_mtu; /* MTU for this path */
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u_long rmx_ssthresh; /* outbound gateway buffer limit */
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u_long rmx_rtt; /* estimated round trip time */
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u_long rmx_rttvar; /* estimated rtt variance */
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u_long rmx_bandwidth; /* estimated bandwidth */
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u_long rmx_cwnd; /* congestion window */
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u_long rmx_sendpipe; /* outbound delay-bandwidth product */
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u_long rmx_recvpipe; /* inbound delay-bandwidth product */
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struct rmxp_tao rmx_tao; /* TAO cache for T/TCP */
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/* tcp hostcache internal data */
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int rmx_expire; /* lifetime for object */
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u_long rmx_hits; /* number of hits */
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u_long rmx_updates; /* number of updates */
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};
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/* Arbitrary values */
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#define TCP_HOSTCACHE_HASHSIZE 512
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#define TCP_HOSTCACHE_BUCKETLIMIT 30
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#define TCP_HOSTCACHE_EXPIRE 60*60 /* one hour */
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#define TCP_HOSTCACHE_PRUNE 5*60 /* every 5 minutes */
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struct tcp_hostcache {
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struct hc_head *hashbase;
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uma_zone_t zone;
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u_int hashsize;
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u_int hashmask;
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u_int bucket_limit;
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u_int cache_count;
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u_int cache_limit;
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int expire;
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int purgeall;
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};
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static struct tcp_hostcache tcp_hostcache;
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static struct callout tcp_hc_callout;
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static struct hc_metrics *tcp_hc_lookup(struct in_conninfo *);
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static struct hc_metrics *tcp_hc_insert(struct in_conninfo *);
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static int sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS);
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static void tcp_hc_purge(void *);
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SYSCTL_NODE(_net_inet_tcp, OID_AUTO, hostcache, CTLFLAG_RW, 0, "TCP Host cache");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, cachelimit, CTLFLAG_RDTUN,
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&tcp_hostcache.cache_limit, 0, "Overall entry limit for hostcache");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, hashsize, CTLFLAG_RDTUN,
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&tcp_hostcache.hashsize, 0, "Size of TCP hostcache hashtable");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, bucketlimit, CTLFLAG_RDTUN,
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&tcp_hostcache.bucket_limit, 0, "Per-bucket hash limit for hostcache");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, count, CTLFLAG_RD,
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&tcp_hostcache.cache_count, 0, "Current number of entries in hostcache");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, expire, CTLFLAG_RW,
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&tcp_hostcache.expire, 0, "Expire time of TCP hostcache entries");
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SYSCTL_INT(_net_inet_tcp_hostcache, OID_AUTO, purge, CTLFLAG_RW,
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&tcp_hostcache.purgeall, 0, "Expire all entires on next purge run");
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SYSCTL_PROC(_net_inet_tcp_hostcache, OID_AUTO, list,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP, 0, 0,
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sysctl_tcp_hc_list, "A", "List of all hostcache entries");
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static MALLOC_DEFINE(M_HOSTCACHE, "hostcache", "TCP hostcache");
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#define HOSTCACHE_HASH(ip) \
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(((ip)->s_addr ^ ((ip)->s_addr >> 7) ^ ((ip)->s_addr >> 17)) & \
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tcp_hostcache.hashmask)
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/* XXX: What is the recommended hash to get good entropy for IPv6 addresses? */
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#define HOSTCACHE_HASH6(ip6) \
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(((ip6)->s6_addr32[0] ^ \
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(ip6)->s6_addr32[1] ^ \
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(ip6)->s6_addr32[2] ^ \
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(ip6)->s6_addr32[3]) & \
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tcp_hostcache.hashmask)
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#define THC_LOCK(lp) mtx_lock(lp)
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#define THC_UNLOCK(lp) mtx_unlock(lp)
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void
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tcp_hc_init(void)
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{
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int i;
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/*
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* Initialize hostcache structures
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*/
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tcp_hostcache.cache_count = 0;
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tcp_hostcache.hashsize = TCP_HOSTCACHE_HASHSIZE;
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tcp_hostcache.bucket_limit = TCP_HOSTCACHE_BUCKETLIMIT;
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tcp_hostcache.cache_limit =
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tcp_hostcache.hashsize * tcp_hostcache.bucket_limit;
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tcp_hostcache.expire = TCP_HOSTCACHE_EXPIRE;
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TUNABLE_INT_FETCH("net.inet.tcp.hostcache.hashsize",
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&tcp_hostcache.hashsize);
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TUNABLE_INT_FETCH("net.inet.tcp.hostcache.cachelimit",
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&tcp_hostcache.cache_limit);
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TUNABLE_INT_FETCH("net.inet.tcp.hostcache.bucketlimit",
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&tcp_hostcache.bucket_limit);
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if (!powerof2(tcp_hostcache.hashsize)) {
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printf("WARNING: hostcache hash size is not a power of 2.\n");
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tcp_hostcache.hashsize = 512; /* safe default */
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}
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tcp_hostcache.hashmask = tcp_hostcache.hashsize - 1;
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/*
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* Allocate the hash table
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*/
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tcp_hostcache.hashbase = (struct hc_head *)
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malloc(tcp_hostcache.hashsize * sizeof(struct hc_head),
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M_HOSTCACHE, M_WAITOK | M_ZERO);
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/*
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* Initialize the hash buckets
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*/
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for (i = 0; i < tcp_hostcache.hashsize; i++) {
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TAILQ_INIT(&tcp_hostcache.hashbase[i].hch_bucket);
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tcp_hostcache.hashbase[i].hch_length = 0;
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mtx_init(&tcp_hostcache.hashbase[i].hch_mtx, "tcp_hc_entry",
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NULL, MTX_DEF);
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}
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/*
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* Allocate the hostcache entries.
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*/
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tcp_hostcache.zone = uma_zcreate("hostcache", sizeof(struct hc_metrics),
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NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(tcp_hostcache.zone, tcp_hostcache.cache_limit);
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/*
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* Set up periodic cache cleanup.
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*/
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callout_init(&tcp_hc_callout, CALLOUT_MPSAFE);
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callout_reset(&tcp_hc_callout, TCP_HOSTCACHE_PRUNE * hz, tcp_hc_purge, 0);
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}
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/*
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* Internal function: lookup an entry in the hostcache or return NULL.
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*
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* If an entry has been returned, the caller becomes responsible for
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* unlocking the bucket row after he is done reading/modifying the entry.
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*/
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static struct hc_metrics *
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tcp_hc_lookup(struct in_conninfo *inc)
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{
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int hash;
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struct hc_head *hc_head;
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struct hc_metrics *hc_entry;
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KASSERT(inc != NULL, ("tcp_hc_lookup with NULL in_conninfo pointer"));
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/*
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* Hash the foreign ip address.
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*/
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if (inc->inc_isipv6)
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hash = HOSTCACHE_HASH6(&inc->inc6_faddr);
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else
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hash = HOSTCACHE_HASH(&inc->inc_faddr);
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hc_head = &tcp_hostcache.hashbase[hash];
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/*
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* aquire lock for this bucket row
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* we release the lock if we don't find an entry,
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* otherwise the caller has to unlock after he is done
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*/
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THC_LOCK(&hc_head->hch_mtx);
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/*
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* circle through entries in bucket row looking for a match
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*/
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TAILQ_FOREACH(hc_entry, &hc_head->hch_bucket, rmx_q) {
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if (inc->inc_isipv6) {
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if (memcmp(&inc->inc6_faddr, &hc_entry->ip6,
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sizeof(inc->inc6_faddr)) == 0)
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return hc_entry;
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} else {
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if (memcmp(&inc->inc_faddr, &hc_entry->ip4,
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sizeof(inc->inc_faddr)) == 0)
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return hc_entry;
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}
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}
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/*
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* We were unsuccessful and didn't find anything
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*/
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THC_UNLOCK(&hc_head->hch_mtx);
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return NULL;
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}
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/*
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* Internal function: insert an entry into the hostcache or return NULL
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* if unable to allocate a new one.
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*
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* If an entry has been returned, the caller becomes responsible for
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* unlocking the bucket row after he is done reading/modifying the entry.
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*/
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static struct hc_metrics *
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tcp_hc_insert(struct in_conninfo *inc)
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{
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int hash;
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struct hc_head *hc_head;
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struct hc_metrics *hc_entry;
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KASSERT(inc != NULL, ("tcp_hc_insert with NULL in_conninfo pointer"));
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/*
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* Hash the foreign ip address
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*/
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if (inc->inc_isipv6)
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hash = HOSTCACHE_HASH6(&inc->inc6_faddr);
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else
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hash = HOSTCACHE_HASH(&inc->inc_faddr);
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hc_head = &tcp_hostcache.hashbase[hash];
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/*
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* aquire lock for this bucket row
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* we release the lock if we don't find an entry,
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* otherwise the caller has to unlock after he is done
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*/
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THC_LOCK(&hc_head->hch_mtx);
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/*
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* If the bucket limit is reached reuse the least used element
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*/
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if (hc_head->hch_length >= tcp_hostcache.bucket_limit ||
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tcp_hostcache.cache_count >= tcp_hostcache.cache_limit) {
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hc_entry = TAILQ_LAST(&hc_head->hch_bucket, hc_qhead);
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/*
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* At first we were dropping the last element, just to
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* reaquire it in the next two lines again which ain't
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* very efficient. Instead just reuse the least used element.
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* Maybe we drop something that is still "in-use" but we can
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* be "lossy".
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*/
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TAILQ_REMOVE(&hc_head->hch_bucket, hc_entry, rmx_q);
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tcp_hostcache.hashbase[hash].hch_length--;
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tcp_hostcache.cache_count--;
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tcpstat.tcps_hc_bucketoverflow++;
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#if 0
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uma_zfree(tcp_hostcache.zone, hc_entry);
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#endif
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} else {
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/*
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* Allocate a new entry, or balk if not possible
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*/
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hc_entry = uma_zalloc(tcp_hostcache.zone, M_NOWAIT);
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if (hc_entry == NULL) {
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THC_UNLOCK(&hc_head->hch_mtx);
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return NULL;
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}
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}
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/*
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* Initialize basic information of hostcache entry
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*/
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bzero(hc_entry, sizeof(*hc_entry));
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if (inc->inc_isipv6)
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bcopy(&hc_entry->ip6, &inc->inc6_faddr, sizeof(hc_entry->ip6));
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else
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hc_entry->ip4 = inc->inc_faddr;
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hc_entry->rmx_head = hc_head;
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hc_entry->rmx_expire = tcp_hostcache.expire;
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/*
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* Put it upfront
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*/
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TAILQ_INSERT_HEAD(&hc_head->hch_bucket, hc_entry, rmx_q);
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tcp_hostcache.hashbase[hash].hch_length++;
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tcp_hostcache.cache_count++;
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tcpstat.tcps_hc_added++;
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return hc_entry;
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}
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/*
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* External function: lookup an entry in the hostcache and fill out the
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* supplied tcp metrics structure. Fills in null when no entry was found
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* or a value is not set.
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*/
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void
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tcp_hc_get(struct in_conninfo *inc, struct hc_metrics_lite *hc_metrics_lite)
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{
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struct hc_metrics *hc_entry;
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/*
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* Find the right bucket
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*/
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hc_entry = tcp_hc_lookup(inc);
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/*
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* If we don't have an existing object
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*/
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if (hc_entry == NULL) {
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bzero(hc_metrics_lite, sizeof(*hc_metrics_lite));
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return;
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}
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hc_entry->rmx_hits++;
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hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
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hc_metrics_lite->rmx_mtu = hc_entry->rmx_mtu;
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hc_metrics_lite->rmx_ssthresh = hc_entry->rmx_ssthresh;
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hc_metrics_lite->rmx_rtt = hc_entry->rmx_rtt;
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hc_metrics_lite->rmx_rttvar = hc_entry->rmx_rttvar;
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hc_metrics_lite->rmx_bandwidth = hc_entry->rmx_bandwidth;
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hc_metrics_lite->rmx_cwnd = hc_entry->rmx_cwnd;
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hc_metrics_lite->rmx_sendpipe = hc_entry->rmx_sendpipe;
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hc_metrics_lite->rmx_recvpipe = hc_entry->rmx_recvpipe;
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/*
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* unlock bucket row
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*/
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THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
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}
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/*
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* External function: lookup an entry in the hostcache and return the
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* discovered path mtu. Returns null if no entry found or value not is set.
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*/
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u_long
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tcp_hc_getmtu(struct in_conninfo *inc)
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{
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struct hc_metrics *hc_entry;
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u_long mtu;
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hc_entry = tcp_hc_lookup(inc);
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if (hc_entry == NULL) {
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return 0;
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}
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hc_entry->rmx_hits++;
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hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
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mtu = hc_entry->rmx_mtu;
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THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
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return mtu;
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}
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/*
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* External function: lookup an entry in the hostcache and fill out the
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* supplied t/tcp tao structure. Fills in null when no entry was found
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* or a value is not set.
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*/
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void
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tcp_hc_gettao(struct in_conninfo *inc, struct rmxp_tao *tao)
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{
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struct hc_metrics *hc_entry;
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hc_entry = tcp_hc_lookup(inc);
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if (hc_entry == NULL) {
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bzero(tao, sizeof(*tao));
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|
return;
|
|
}
|
|
hc_entry->rmx_hits++;
|
|
hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
|
|
|
|
bcopy(tao, &hc_entry->rmx_tao, sizeof(*tao));
|
|
THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
|
|
}
|
|
|
|
/*
|
|
* External function: update the mtu value of an entry in the hostcache.
|
|
* Creates a new entry if none was found.
|
|
*/
|
|
void
|
|
tcp_hc_updatemtu(struct in_conninfo *inc, u_long mtu)
|
|
{
|
|
struct hc_metrics *hc_entry;
|
|
|
|
/*
|
|
* Find the right bucket
|
|
*/
|
|
hc_entry = tcp_hc_lookup(inc);
|
|
|
|
/*
|
|
* If we don't have an existing object try to insert a new one
|
|
*/
|
|
if (hc_entry == NULL) {
|
|
hc_entry = tcp_hc_insert(inc);
|
|
if (hc_entry == NULL)
|
|
return;
|
|
}
|
|
hc_entry->rmx_updates++;
|
|
hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
|
|
|
|
hc_entry->rmx_mtu = mtu;
|
|
|
|
/*
|
|
* put it upfront so we find it faster next time
|
|
*/
|
|
TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
|
|
/*
|
|
* unlock bucket row
|
|
*/
|
|
THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
|
|
}
|
|
|
|
/*
|
|
* External function: update the tcp metrics of an entry in the hostcache.
|
|
* Creates a new entry if none was found.
|
|
*/
|
|
void
|
|
tcp_hc_update(struct in_conninfo *inc, struct hc_metrics_lite *hcml)
|
|
{
|
|
struct hc_metrics *hc_entry;
|
|
|
|
hc_entry = tcp_hc_lookup(inc);
|
|
if (hc_entry == NULL) {
|
|
hc_entry = tcp_hc_insert(inc);
|
|
if (hc_entry == NULL)
|
|
return;
|
|
}
|
|
hc_entry->rmx_updates++;
|
|
hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
|
|
|
|
if (hcml->rmx_rtt != 0) {
|
|
if (hc_entry->rmx_rtt == 0)
|
|
hc_entry->rmx_rtt = hcml->rmx_rtt;
|
|
else
|
|
hc_entry->rmx_rtt =
|
|
(hc_entry->rmx_rtt + hcml->rmx_rtt) / 2;
|
|
tcpstat.tcps_cachedrtt++;
|
|
}
|
|
if (hcml->rmx_rttvar != 0) {
|
|
if (hc_entry->rmx_rttvar == 0)
|
|
hc_entry->rmx_rttvar = hcml->rmx_rttvar;
|
|
else
|
|
hc_entry->rmx_rttvar =
|
|
(hc_entry->rmx_rttvar + hcml->rmx_rttvar) / 2;
|
|
tcpstat.tcps_cachedrttvar++;
|
|
}
|
|
if (hcml->rmx_ssthresh != 0) {
|
|
if (hc_entry->rmx_ssthresh == 0)
|
|
hc_entry->rmx_ssthresh = hcml->rmx_ssthresh;
|
|
else
|
|
hc_entry->rmx_ssthresh =
|
|
(hc_entry->rmx_ssthresh + hcml->rmx_ssthresh) / 2;
|
|
tcpstat.tcps_cachedssthresh++;
|
|
}
|
|
if (hcml->rmx_bandwidth != 0) {
|
|
if (hc_entry->rmx_bandwidth == 0)
|
|
hc_entry->rmx_bandwidth = hcml->rmx_bandwidth;
|
|
else
|
|
hc_entry->rmx_bandwidth =
|
|
(hc_entry->rmx_bandwidth + hcml->rmx_bandwidth) / 2;
|
|
/* tcpstat.tcps_cachedbandwidth++; */
|
|
}
|
|
if (hcml->rmx_cwnd != 0) {
|
|
if (hc_entry->rmx_cwnd == 0)
|
|
hc_entry->rmx_cwnd = hcml->rmx_cwnd;
|
|
else
|
|
hc_entry->rmx_cwnd =
|
|
(hc_entry->rmx_cwnd + hcml->rmx_cwnd) / 2;
|
|
/* tcpstat.tcps_cachedcwnd++; */
|
|
}
|
|
if (hcml->rmx_sendpipe != 0) {
|
|
if (hc_entry->rmx_sendpipe == 0)
|
|
hc_entry->rmx_sendpipe = hcml->rmx_sendpipe;
|
|
else
|
|
hc_entry->rmx_sendpipe =
|
|
(hc_entry->rmx_sendpipe + hcml->rmx_sendpipe) /2;
|
|
/* tcpstat.tcps_cachedsendpipe++; */
|
|
}
|
|
if (hcml->rmx_recvpipe != 0) {
|
|
if (hc_entry->rmx_recvpipe == 0)
|
|
hc_entry->rmx_recvpipe = hcml->rmx_recvpipe;
|
|
else
|
|
hc_entry->rmx_recvpipe =
|
|
(hc_entry->rmx_recvpipe + hcml->rmx_recvpipe) /2;
|
|
/* tcpstat.tcps_cachedrecvpipe++; */
|
|
}
|
|
|
|
TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
|
|
}
|
|
|
|
/*
|
|
* External function: update the t/tcp tao of an entry in the hostcache.
|
|
* Creates a new entry if none was found.
|
|
*/
|
|
void
|
|
tcp_hc_updatetao(struct in_conninfo *inc, int field, tcp_cc ccount, u_short mss)
|
|
{
|
|
struct hc_metrics *hc_entry;
|
|
|
|
hc_entry = tcp_hc_lookup(inc);
|
|
if (hc_entry == NULL) {
|
|
hc_entry = tcp_hc_insert(inc);
|
|
if (hc_entry == NULL)
|
|
return;
|
|
}
|
|
hc_entry->rmx_updates++;
|
|
hc_entry->rmx_expire = tcp_hostcache.expire; /* start over again */
|
|
|
|
switch(field) {
|
|
case TCP_HC_TAO_CC:
|
|
hc_entry->rmx_tao.tao_cc = ccount;
|
|
break;
|
|
|
|
case TCP_HC_TAO_CCSENT:
|
|
hc_entry->rmx_tao.tao_ccsent = ccount;
|
|
break;
|
|
|
|
case TCP_HC_TAO_MSSOPT:
|
|
hc_entry->rmx_tao.tao_mssopt = mss;
|
|
break;
|
|
}
|
|
|
|
TAILQ_REMOVE(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
TAILQ_INSERT_HEAD(&hc_entry->rmx_head->hch_bucket, hc_entry, rmx_q);
|
|
THC_UNLOCK(&hc_entry->rmx_head->hch_mtx);
|
|
}
|
|
|
|
/*
|
|
* Sysctl function: prints the list and values of all hostcache entries in
|
|
* unsorted order.
|
|
*/
|
|
static int
|
|
sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int bufsize;
|
|
int linesize = 128;
|
|
char *p, *buf;
|
|
int len, i, error;
|
|
struct hc_metrics *hc_entry;
|
|
|
|
bufsize = linesize * (tcp_hostcache.cache_count + 1);
|
|
|
|
p = buf = (char *)malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
|
|
|
|
len = snprintf(p, linesize,
|
|
"\nIP address MTU SSTRESH RTT RTTVAR BANDWIDTH "
|
|
" CWND SENDPIPE RECVPIPE HITS UPD EXP\n");
|
|
p += len;
|
|
|
|
#define msec(u) (((u) + 500) / 1000)
|
|
for (i = 0; i < tcp_hostcache.hashsize; i++) {
|
|
THC_LOCK(&tcp_hostcache.hashbase[i].hch_mtx);
|
|
TAILQ_FOREACH(hc_entry, &tcp_hostcache.hashbase[i].hch_bucket,
|
|
rmx_q) {
|
|
len = snprintf(p, linesize,
|
|
"%-15s %5lu %8lu %6lums %6lums %9lu %8lu %8lu %8lu "
|
|
"%4lu %4lu %4i\n",
|
|
hc_entry->ip4.s_addr ? inet_ntoa(hc_entry->ip4) :
|
|
#ifdef INET6
|
|
ip6_sprintf(&hc_entry->ip6),
|
|
#else
|
|
"IPv6?",
|
|
#endif
|
|
hc_entry->rmx_mtu,
|
|
hc_entry->rmx_ssthresh,
|
|
msec(hc_entry->rmx_rtt *
|
|
(RTM_RTTUNIT / (hz * TCP_RTT_SCALE))),
|
|
msec(hc_entry->rmx_rttvar *
|
|
(RTM_RTTUNIT / (hz * TCP_RTT_SCALE))),
|
|
hc_entry->rmx_bandwidth * hz * 8,
|
|
hc_entry->rmx_cwnd,
|
|
hc_entry->rmx_sendpipe,
|
|
hc_entry->rmx_recvpipe,
|
|
hc_entry->rmx_hits,
|
|
hc_entry->rmx_updates,
|
|
hc_entry->rmx_expire);
|
|
p += len;
|
|
}
|
|
THC_UNLOCK(&tcp_hostcache.hashbase[i].hch_mtx);
|
|
}
|
|
#undef msec
|
|
error = SYSCTL_OUT(req, buf, p - buf);
|
|
free(buf, M_TEMP);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Expire and purge (old|all) entries in the tcp_hostcache. Runs periodically
|
|
* from the callout.
|
|
*/
|
|
static void
|
|
tcp_hc_purge(void *arg)
|
|
{
|
|
struct hc_metrics *hc_entry;
|
|
int all = (intptr_t)arg;
|
|
int i;
|
|
|
|
if (tcp_hostcache.purgeall) {
|
|
all = 1;
|
|
tcp_hostcache.purgeall = 0;
|
|
}
|
|
|
|
for (i = 0; i < tcp_hostcache.hashsize; i++) {
|
|
THC_LOCK(&tcp_hostcache.hashbase[i].hch_mtx);
|
|
TAILQ_FOREACH(hc_entry, &tcp_hostcache.hashbase[i].hch_bucket,
|
|
rmx_q) {
|
|
if (all || hc_entry->rmx_expire <= 0) {
|
|
TAILQ_REMOVE(&tcp_hostcache.hashbase[i].hch_bucket,
|
|
hc_entry, rmx_q);
|
|
uma_zfree(tcp_hostcache.zone, hc_entry);
|
|
tcp_hostcache.hashbase[i].hch_length--;
|
|
tcp_hostcache.cache_count--;
|
|
} else
|
|
hc_entry->rmx_expire -= TCP_HOSTCACHE_PRUNE;
|
|
}
|
|
THC_UNLOCK(&tcp_hostcache.hashbase[i].hch_mtx);
|
|
}
|
|
callout_reset(&tcp_hc_callout, TCP_HOSTCACHE_PRUNE * hz, tcp_hc_purge, 0);
|
|
}
|