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[SCTP]: Remove multiple levels of msecs to jiffies conversions.
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The SCTP sysctl entries are displayed in milliseconds, but stored
internally in jiffies. This results in multiple levels of msecs to
jiffies conversion and as a result produces a truncation error. This
patch makes things consistent in that we store and display defaults
in milliseconds and only convert once for use by association.
This patch also adds some sane min/max values so that we don't go off
the deep end.

Signed-off-by: Vladislav Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Vladislav Yasevich authored and David S. Miller committed Sep 22, 2006
1 parent ce556b3 commit 3fd091e
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Showing 6 changed files with 84 additions and 100 deletions.
13 changes: 6 additions & 7 deletions include/net/sctp/constants.h
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Original file line number Diff line number Diff line change
Expand Up @@ -264,20 +264,20 @@ enum { SCTP_MAX_DUP_TSNS = 16 };
enum { SCTP_MAX_GABS = 16 };

/* Heartbeat interval - 30 secs */
#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30 * HZ)
#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)

/* Delayed sack timer - 200ms */
#define SCTP_DEFAULT_TIMEOUT_SACK ((200 * HZ) / 1000)
#define SCTP_DEFAULT_TIMEOUT_SACK (200)

/* RTO.Initial - 3 seconds
* RTO.Min - 1 second
* RTO.Max - 60 seconds
* RTO.Alpha - 1/8
* RTO.Beta - 1/4
*/
#define SCTP_RTO_INITIAL (3 * HZ)
#define SCTP_RTO_MIN (1 * HZ)
#define SCTP_RTO_MAX (60 * HZ)
#define SCTP_RTO_INITIAL (3 * 1000)
#define SCTP_RTO_MIN (1 * 1000)
#define SCTP_RTO_MAX (60 * 1000)

#define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */
#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
Expand All @@ -290,8 +290,7 @@ enum { SCTP_MAX_GABS = 16 };
#define SCTP_DEF_MAX_INIT 6
#define SCTP_DEF_MAX_SEND 10

#define SCTP_DEFAULT_COOKIE_LIFE_SEC 60 /* seconds */
#define SCTP_DEFAULT_COOKIE_LIFE_USEC 0 /* microseconds */
#define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */

#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
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12 changes: 6 additions & 6 deletions include/net/sctp/structs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -128,9 +128,9 @@ extern struct sctp_globals {
* RTO.Alpha - 1/8 (3 when converted to right shifts.)
* RTO.Beta - 1/4 (2 when converted to right shifts.)
*/
unsigned long rto_initial;
unsigned long rto_min;
unsigned long rto_max;
unsigned int rto_initial;
unsigned int rto_min;
unsigned int rto_max;

/* Note: rto_alpha and rto_beta are really defined as inverse
* powers of two to facilitate integer operations.
Expand All @@ -145,13 +145,13 @@ extern struct sctp_globals {
int cookie_preserve_enable;

/* Valid.Cookie.Life - 60 seconds */
unsigned long valid_cookie_life;
unsigned int valid_cookie_life;

/* Delayed SACK timeout 200ms default*/
unsigned long sack_timeout;
unsigned int sack_timeout;

/* HB.interval - 30 seconds */
unsigned long hb_interval;
unsigned int hb_interval;

/* Association.Max.Retrans - 10 attempts
* Path.Max.Retrans - 5 attempts (per destination address)
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2 changes: 1 addition & 1 deletion net/sctp/protocol.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1049,7 +1049,7 @@ SCTP_STATIC __init int sctp_init(void)
sctp_rto_beta = SCTP_RTO_BETA;

/* Valid.Cookie.Life - 60 seconds */
sctp_valid_cookie_life = 60 * HZ;
sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;

/* Whether Cookie Preservative is enabled(1) or not(0) */
sctp_cookie_preserve_enable = 1;
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15 changes: 7 additions & 8 deletions net/sctp/socket.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3045,14 +3045,14 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
sp->initmsg.sinit_max_instreams = sctp_max_instreams;
sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
sp->initmsg.sinit_max_init_timeo = jiffies_to_msecs(sctp_rto_max);
sp->initmsg.sinit_max_init_timeo = sctp_rto_max;

/* Initialize default RTO related parameters. These parameters can
* be modified for with the SCTP_RTOINFO socket option.
*/
sp->rtoinfo.srto_initial = jiffies_to_msecs(sctp_rto_initial);
sp->rtoinfo.srto_max = jiffies_to_msecs(sctp_rto_max);
sp->rtoinfo.srto_min = jiffies_to_msecs(sctp_rto_min);
sp->rtoinfo.srto_initial = sctp_rto_initial;
sp->rtoinfo.srto_max = sctp_rto_max;
sp->rtoinfo.srto_min = sctp_rto_min;

/* Initialize default association related parameters. These parameters
* can be modified with the SCTP_ASSOCINFO socket option.
Expand All @@ -3061,8 +3061,7 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
sp->assocparams.sasoc_number_peer_destinations = 0;
sp->assocparams.sasoc_peer_rwnd = 0;
sp->assocparams.sasoc_local_rwnd = 0;
sp->assocparams.sasoc_cookie_life =
jiffies_to_msecs(sctp_valid_cookie_life);
sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;

/* Initialize default event subscriptions. By default, all the
* options are off.
Expand All @@ -3072,10 +3071,10 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
/* Default Peer Address Parameters. These defaults can
* be modified via SCTP_PEER_ADDR_PARAMS
*/
sp->hbinterval = jiffies_to_msecs(sctp_hb_interval);
sp->hbinterval = sctp_hb_interval;
sp->pathmaxrxt = sctp_max_retrans_path;
sp->pathmtu = 0; // allow default discovery
sp->sackdelay = jiffies_to_msecs(sctp_sack_timeout);
sp->sackdelay = sctp_sack_timeout;
sp->param_flags = SPP_HB_ENABLE |
SPP_PMTUD_ENABLE |
SPP_SACKDELAY_ENABLE;
Expand Down
140 changes: 63 additions & 77 deletions net/sctp/sysctl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -45,9 +45,10 @@
#include <net/sctp/sctp.h>
#include <linux/sysctl.h>

static ctl_handler sctp_sysctl_jiffies_ms;
static long rto_timer_min = 1;
static long rto_timer_max = 86400000; /* One day */
static int zero = 0;
static int one = 1;
static int timer_max = 86400000; /* ms in one day */
static int int_max = INT_MAX;
static long sack_timer_min = 1;
static long sack_timer_max = 500;

Expand All @@ -56,153 +57,172 @@ static ctl_table sctp_table[] = {
.ctl_name = NET_SCTP_RTO_INITIAL,
.procname = "rto_initial",
.data = &sctp_rto_initial,
.maxlen = sizeof(long),
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.extra1 = &rto_timer_min,
.extra2 = &rto_timer_max
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &timer_max
},
{
.ctl_name = NET_SCTP_RTO_MIN,
.procname = "rto_min",
.data = &sctp_rto_min,
.maxlen = sizeof(long),
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.extra1 = &rto_timer_min,
.extra2 = &rto_timer_max
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &timer_max
},
{
.ctl_name = NET_SCTP_RTO_MAX,
.procname = "rto_max",
.data = &sctp_rto_max,
.maxlen = sizeof(long),
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.extra1 = &rto_timer_min,
.extra2 = &rto_timer_max
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &timer_max
},
{
.ctl_name = NET_SCTP_VALID_COOKIE_LIFE,
.procname = "valid_cookie_life",
.data = &sctp_valid_cookie_life,
.maxlen = sizeof(long),
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.extra1 = &rto_timer_min,
.extra2 = &rto_timer_max
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &timer_max
},
{
.ctl_name = NET_SCTP_MAX_BURST,
.procname = "max_burst",
.data = &sctp_max_burst,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &zero,
.extra2 = &int_max
},
{
.ctl_name = NET_SCTP_ASSOCIATION_MAX_RETRANS,
.procname = "association_max_retrans",
.data = &sctp_max_retrans_association,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &int_max
},
{
.ctl_name = NET_SCTP_SNDBUF_POLICY,
.procname = "sndbuf_policy",
.data = &sctp_sndbuf_policy,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_RCVBUF_POLICY,
.procname = "rcvbuf_policy",
.data = &sctp_rcvbuf_policy,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_PATH_MAX_RETRANS,
.procname = "path_max_retrans",
.data = &sctp_max_retrans_path,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &int_max
},
{
.ctl_name = NET_SCTP_MAX_INIT_RETRANSMITS,
.procname = "max_init_retransmits",
.data = &sctp_max_retrans_init,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &int_max
},
{
.ctl_name = NET_SCTP_HB_INTERVAL,
.procname = "hb_interval",
.data = &sctp_hb_interval,
.maxlen = sizeof(long),
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.extra1 = &rto_timer_min,
.extra2 = &rto_timer_max
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &one,
.extra2 = &timer_max
},
{
.ctl_name = NET_SCTP_PRESERVE_ENABLE,
.procname = "cookie_preserve_enable",
.data = &sctp_cookie_preserve_enable,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_RTO_ALPHA,
.procname = "rto_alpha_exp_divisor",
.data = &sctp_rto_alpha,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.mode = 0444,
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_RTO_BETA,
.procname = "rto_beta_exp_divisor",
.data = &sctp_rto_beta,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.mode = 0444,
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_ADDIP_ENABLE,
.procname = "addip_enable",
.data = &sctp_addip_enable,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_PRSCTP_ENABLE,
.procname = "prsctp_enable",
.data = &sctp_prsctp_enable,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_dointvec
.proc_handler = &proc_dointvec,
.strategy = &sysctl_intvec
},
{
.ctl_name = NET_SCTP_SACK_TIMEOUT,
.procname = "sack_timeout",
.data = &sctp_sack_timeout,
.maxlen = sizeof(long),
.mode = 0644,
.proc_handler = &proc_doulongvec_ms_jiffies_minmax,
.strategy = &sctp_sysctl_jiffies_ms,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &sack_timer_min,
.extra2 = &sack_timer_max,
},
Expand Down Expand Up @@ -242,37 +262,3 @@ void sctp_sysctl_unregister(void)
{
unregister_sysctl_table(sctp_sysctl_header);
}

/* Strategy function to convert jiffies to milliseconds. */
static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen, void **context) {

if (oldval) {
size_t olen;

if (oldlenp) {
if (get_user(olen, oldlenp))
return -EFAULT;

if (olen != sizeof (int))
return -EINVAL;
}
if (put_user((*(int *)(table->data) * 1000) / HZ,
(int __user *)oldval) ||
(oldlenp && put_user(sizeof (int), oldlenp)))
return -EFAULT;
}
if (newval && newlen) {
int new;

if (newlen != sizeof (int))
return -EINVAL;

if (get_user(new, (int __user *)newval))
return -EFAULT;

*(int *)(table->data) = (new * HZ) / 1000;
}
return 1;
}
2 changes: 1 addition & 1 deletion net/sctp/transport.c
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Original file line number Diff line number Diff line change
Expand Up @@ -75,7 +75,7 @@ static struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
* parameter 'RTO.Initial'.
*/
peer->rtt = 0;
peer->rto = sctp_rto_initial;
peer->rto = msecs_to_jiffies(sctp_rto_initial);
peer->rttvar = 0;
peer->srtt = 0;
peer->rto_pending = 0;
Expand Down

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