tcp_tunables.c revision 6400a6be1817a40f3dbefdd3df7b7d87bcebef30
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, Joyent Inc. All rights reserved.
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2013 by Delphix. All rights reserved.
*/
/* Copyright (c) 1990 Mentat Inc. */
#include <inet/ip.h>
#include <inet/tcp_impl.h>
#include <sys/multidata.h>
#include <sys/sunddi.h>
/* Max size IP datagram is 64k - 1 */
#define TCP_MSS_MAX_IPV4 (IP_MAXPACKET - (sizeof (ipha_t) + sizeof (tcpha_t)))
#define TCP_MSS_MAX_IPV6 (IP_MAXPACKET - (sizeof (ip6_t) + sizeof (tcpha_t)))
/* Max of the above */
#define TCP_MSS_MAX TCP_MSS_MAX_IPV4
/*
* Set the RFC 1948 pass phrase
*/
/* ARGSUSED */
static int
tcp_set_1948phrase(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void* pr_val, uint_t flags)
{
if (flags & MOD_PROP_DEFAULT)
return (ENOTSUP);
/*
* Basically, value contains a new pass phrase. Pass it along!
*/
tcp_iss_key_init((uint8_t *)pr_val, strlen(pr_val),
stack->netstack_tcp);
return (0);
}
/*
* returns the current list of listener limit configuration.
*/
/* ARGSUSED */
static int
tcp_listener_conf_get(netstack_t *stack, mod_prop_info_t *pinfo,
const char *ifname, void *val, uint_t psize, uint_t flags)
{
tcp_stack_t *tcps = stack->netstack_tcp;
tcp_listener_t *tl;
char *pval = val;
size_t nbytes = 0, tbytes = 0;
uint_t size;
int err = 0;
bzero(pval, psize);
size = psize;
if (flags & (MOD_PROP_DEFAULT|MOD_PROP_PERM|MOD_PROP_POSSIBLE))
return (0);
mutex_enter(&tcps->tcps_listener_conf_lock);
for (tl = list_head(&tcps->tcps_listener_conf); tl != NULL;
tl = list_next(&tcps->tcps_listener_conf, tl)) {
if (psize == size)
nbytes = snprintf(pval, size, "%d:%d", tl->tl_port,
tl->tl_ratio);
else
nbytes = snprintf(pval, size, ",%d:%d", tl->tl_port,
tl->tl_ratio);
size -= nbytes;
pval += nbytes;
tbytes += nbytes;
if (tbytes >= psize) {
/* Buffer overflow, stop copying information */
err = ENOBUFS;
break;
}
}
mutex_exit(&tcps->tcps_listener_conf_lock);
return (err);
}
/*
* add a new listener limit configuration.
*/
/* ARGSUSED */
static int
tcp_listener_conf_add(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void* pval, uint_t flags)
{
tcp_listener_t *new_tl;
tcp_listener_t *tl;
long lport;
long ratio;
char *colon;
tcp_stack_t *tcps = stack->netstack_tcp;
if (flags & MOD_PROP_DEFAULT)
return (ENOTSUP);
if (ddi_strtol(pval, &colon, 10, &lport) != 0 || lport <= 0 ||
lport > USHRT_MAX || *colon != ':') {
return (EINVAL);
}
if (ddi_strtol(colon + 1, NULL, 10, &ratio) != 0 || ratio <= 0)
return (EINVAL);
mutex_enter(&tcps->tcps_listener_conf_lock);
for (tl = list_head(&tcps->tcps_listener_conf); tl != NULL;
tl = list_next(&tcps->tcps_listener_conf, tl)) {
/* There is an existing entry, so update its ratio value. */
if (tl->tl_port == lport) {
tl->tl_ratio = ratio;
mutex_exit(&tcps->tcps_listener_conf_lock);
return (0);
}
}
if ((new_tl = kmem_alloc(sizeof (tcp_listener_t), KM_NOSLEEP)) ==
NULL) {
mutex_exit(&tcps->tcps_listener_conf_lock);
return (ENOMEM);
}
new_tl->tl_port = lport;
new_tl->tl_ratio = ratio;
list_insert_tail(&tcps->tcps_listener_conf, new_tl);
mutex_exit(&tcps->tcps_listener_conf_lock);
return (0);
}
/*
* remove a listener limit configuration.
*/
/* ARGSUSED */
static int
tcp_listener_conf_del(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void* pval, uint_t flags)
{
tcp_listener_t *tl;
long lport;
tcp_stack_t *tcps = stack->netstack_tcp;
if (flags & MOD_PROP_DEFAULT)
return (ENOTSUP);
if (ddi_strtol(pval, NULL, 10, &lport) != 0 || lport <= 0 ||
lport > USHRT_MAX) {
return (EINVAL);
}
mutex_enter(&tcps->tcps_listener_conf_lock);
for (tl = list_head(&tcps->tcps_listener_conf); tl != NULL;
tl = list_next(&tcps->tcps_listener_conf, tl)) {
if (tl->tl_port == lport) {
list_remove(&tcps->tcps_listener_conf, tl);
mutex_exit(&tcps->tcps_listener_conf_lock);
kmem_free(tl, sizeof (tcp_listener_t));
return (0);
}
}
mutex_exit(&tcps->tcps_listener_conf_lock);
return (ESRCH);
}
static int
tcp_set_buf_prop(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void *pval, uint_t flags)
{
return (mod_set_buf_prop(stack->netstack_tcp->tcps_propinfo_tbl, stack,
cr, pinfo, ifname, pval, flags));
}
static int
tcp_get_buf_prop(netstack_t *stack, mod_prop_info_t *pinfo, const char *ifname,
void *val, uint_t psize, uint_t flags)
{
return (mod_get_buf_prop(stack->netstack_tcp->tcps_propinfo_tbl, stack,
pinfo, ifname, val, psize, flags));
}
/*
* Special checkers for smallest/largest anonymous port so they don't
* ever happen to be (largest < smallest).
*/
/* ARGSUSED */
static int
tcp_smallest_anon_set(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void *pval, uint_t flags)
{
unsigned long new_value;
tcp_stack_t *tcps = stack->netstack_tcp;
int err;
if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
return (err);
/* mod_uint32_value() + pinfo guarantees we're in TCP port range. */
if ((uint32_t)new_value > tcps->tcps_largest_anon_port)
return (ERANGE);
pinfo->prop_cur_uval = (uint32_t)new_value;
return (0);
}
/* ARGSUSED */
static int
tcp_largest_anon_set(netstack_t *stack, cred_t *cr, mod_prop_info_t *pinfo,
const char *ifname, const void *pval, uint_t flags)
{
unsigned long new_value;
tcp_stack_t *tcps = stack->netstack_tcp;
int err;
if ((err = mod_uint32_value(pval, pinfo, flags, &new_value)) != 0)
return (err);
/* mod_uint32_value() + pinfo guarantees we're in TCP port range. */
if ((uint32_t)new_value < tcps->tcps_smallest_anon_port)
return (ERANGE);
pinfo->prop_cur_uval = (uint32_t)new_value;
return (0);
}
/*
* All of these are alterable, within the min/max values given, at run time.
*
* Note: All those tunables which do not start with "_" are Committed and
* therefore are public. See PSARC 2010/080.
*/
mod_prop_info_t tcp_propinfo_tbl[] = {
/* tunable - 0 */
{ "_time_wait_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*SECONDS, 10*MINUTES, 1*MINUTES}, {1*MINUTES} },
{ "_conn_req_max_q", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, UINT32_MAX, 128}, {128} },
{ "_conn_req_max_q0", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, UINT32_MAX, 1024}, {1024} },
{ "_conn_req_min", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, 1024, 1}, {1} },
{ "_conn_grace_period", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0*MS, 20*SECONDS, 0*MS}, {0*MS} },
{ "_cwnd_max", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{128, ULP_MAX_BUF, 1024*1024}, {1024*1024} },
{ "_debug", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 10, 0}, {0} },
{ "smallest_nonpriv_port", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1024, (32*1024), 1024}, {1024} },
{ "_ip_abort_cinterval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*SECONDS, UINT32_MAX, 3*MINUTES}, {3*MINUTES} },
{ "_ip_abort_linterval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*SECONDS, UINT32_MAX, 3*MINUTES}, {3*MINUTES} },
/* tunable - 10 */
{ "_ip_abort_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{500*MS, UINT32_MAX, 5*MINUTES}, {5*MINUTES} },
{ "_ip_notify_cinterval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*SECONDS, UINT32_MAX, 10*SECONDS},
{10*SECONDS} },
{ "_ip_notify_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{500*MS, UINT32_MAX, 10*SECONDS}, {10*SECONDS} },
{ "_ipv4_ttl", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, 255, 64}, {64} },
{ "_keepalive_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{10*SECONDS, 10*DAYS, 2*HOURS}, {2*HOURS} },
{ "_maxpsz_multiplier", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 100, 10}, {10} },
{ "_mss_def_ipv4", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, TCP_MSS_MAX_IPV4, 536}, {536} },
{ "_mss_max_ipv4", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, TCP_MSS_MAX_IPV4, TCP_MSS_MAX_IPV4},
{TCP_MSS_MAX_IPV4} },
{ "_mss_min", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, TCP_MSS_MAX, 108}, {108} },
{ "_naglim_def", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, (64*1024)-1, (4*1024)-1}, {(4*1024)-1} },
/* tunable - 20 */
{ "_rexmit_interval_initial", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*MS, 20*SECONDS, 1*SECONDS}, {1*SECONDS} },
{ "_rexmit_interval_max", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*MS, 2*HOURS, 60*SECONDS}, {60*SECONDS} },
{ "_rexmit_interval_min", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*MS, 2*HOURS, 400*MS}, {400*MS} },
{ "_deferred_ack_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*MS, 1*MINUTES, 100*MS}, {100*MS} },
{ "_snd_lowat_fraction", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 16, 10}, {10} },
{ "_dupack_fast_retransmit", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, 10000, 3}, {3} },
{ "_ignore_path_mtu", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_FALSE}, {B_FALSE} },
{ "smallest_anon_port", MOD_PROTO_TCP,
tcp_smallest_anon_set, mod_get_uint32,
{1024, ULP_MAX_PORT, 32*1024}, {32*1024} },
{ "largest_anon_port", MOD_PROTO_TCP,
tcp_largest_anon_set, mod_get_uint32,
{1024, ULP_MAX_PORT, ULP_MAX_PORT},
{ULP_MAX_PORT} },
{ "send_buf", MOD_PROTO_TCP,
tcp_set_buf_prop, tcp_get_buf_prop,
{TCP_XMIT_LOWATER, ULP_MAX_BUF, TCP_XMIT_HIWATER},
{TCP_XMIT_HIWATER} },
/* tunable - 30 */
{ "_xmit_lowat", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{TCP_XMIT_LOWATER, ULP_MAX_BUF, TCP_XMIT_LOWATER},
{TCP_XMIT_LOWATER} },
{ "recv_buf", MOD_PROTO_TCP,
tcp_set_buf_prop, tcp_get_buf_prop,
{TCP_RECV_LOWATER, ULP_MAX_BUF, TCP_RECV_HIWATER},
{TCP_RECV_HIWATER} },
{ "_recv_hiwat_minmss", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, 65536, 4}, {4} },
{ "_fin_wait_2_flush_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1*SECONDS, 2*HOURS, 60*SECONDS},
{60*SECONDS} },
{ "max_buf", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{8192, ULP_MAX_BUF, 1024*1024}, {1024*1024} },
{ "_strong_iss", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 2, 2}, {2} },
{ "_rtt_updates", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 65536, 20}, {20} },
{ "_wscale_always", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_TRUE}, {B_TRUE} },
{ "_tstamp_always", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_FALSE}, {B_FALSE} },
{ "_tstamp_if_wscale", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_TRUE}, {B_TRUE} },
/* tunable - 40 */
{ "_rexmit_interval_extra", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0*MS, 2*HOURS, 0*MS}, {0*MS} },
{ "_deferred_acks_max", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 16, 2}, {2} },
{ "_slow_start_after_idle", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 16384, 0}, {0} },
{ "_slow_start_initial", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 16, 0}, {0} },
{ "sack", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 2, 2}, {2} },
{ "_ipv6_hoplimit", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, IPV6_MAX_HOPS, IPV6_DEFAULT_HOPS},
{IPV6_DEFAULT_HOPS} },
{ "_mss_def_ipv6", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, TCP_MSS_MAX_IPV6, 1220}, {1220} },
{ "_mss_max_ipv6", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, TCP_MSS_MAX_IPV6, TCP_MSS_MAX_IPV6},
{TCP_MSS_MAX_IPV6} },
{ "_rev_src_routes", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_FALSE}, {B_FALSE} },
{ "_local_dack_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{10*MS, 500*MS, 50*MS}, {50*MS} },
/* tunable - 50 */
{ "_local_dacks_max", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 16, 8}, {8} },
{ "ecn", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 2, 1}, {1} },
{ "_rst_sent_rate_enabled", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_TRUE}, {B_TRUE} },
{ "_rst_sent_rate", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, UINT32_MAX, 40}, {40} },
{ "_push_timer_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, 100*MS, 50*MS}, {50*MS} },
{ "_use_smss_as_mss_opt", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_FALSE}, {B_FALSE} },
{ "_keepalive_abort_interval", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, UINT32_MAX, 8*MINUTES}, {8*MINUTES} },
/*
* tcp_wroff_xtra is the extra space in front of TCP/IP header for link
* layer header. It has to be a multiple of 8.
*/
{ "_wroff_xtra", MOD_PROTO_TCP,
mod_set_aligned, mod_get_uint32,
{0, 256, 32}, {32} },
{ "_dev_flow_ctl", MOD_PROTO_TCP,
mod_set_boolean, mod_get_boolean,
{B_FALSE}, {B_FALSE} },
{ "_reass_timeout", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{0, UINT32_MAX, 100*SECONDS}, {100*SECONDS} },
/* tunable - 60 */
{ "extra_priv_ports", MOD_PROTO_TCP,
mod_set_extra_privports, mod_get_extra_privports,
{1, ULP_MAX_PORT, 0}, {0} },
{ "_1948_phrase", MOD_PROTO_TCP,
tcp_set_1948phrase, NULL, {0}, {0} },
{ "_listener_limit_conf", MOD_PROTO_TCP,
NULL, tcp_listener_conf_get, {0}, {0} },
{ "_listener_limit_conf_add", MOD_PROTO_TCP,
tcp_listener_conf_add, NULL, {0}, {0} },
{ "_listener_limit_conf_del", MOD_PROTO_TCP,
tcp_listener_conf_del, NULL, {0}, {0} },
{ "_iss_incr", MOD_PROTO_TCP,
mod_set_uint32, mod_get_uint32,
{1, ISS_INCR, ISS_INCR},
{ISS_INCR} },
{ "?", MOD_PROTO_TCP, NULL, mod_get_allprop, {0}, {0} },
{ NULL, 0, NULL, NULL, {0}, {0} }
};
int tcp_propinfo_count = A_CNT(tcp_propinfo_tbl);