xnu-3247.1.106.tar.gz

[apple/xnu.git] / bsd / kern / kern_time.c

diff --git a/bsd/kern/kern_time.c b/bsd/kern/kern_time.c
index 6f392fb86c6ad48cc8c0a12cc02fad672709e5c2..cfbd3c99f47c1c1cfb622d8fe59ac361457ab729 100644 (file)
--- a/bsd/kern/kern_time.c
+++ b/bsd/kern/kern_time.c
@@ -75,10 +75,12 @@
 #include <sys/kauth.h>
 #include <sys/vnode.h>
 #include <sys/time.h>
+#include <sys/priv.h>
 
 #include <sys/mount_internal.h>
 #include <sys/sysproto.h>
 #include <sys/signalvar.h>
+#include <sys/protosw.h> /* for net_uptime2timeval() */
 
 #include <kern/clock.h>
 #include <kern/task.h>
@@ -98,7 +100,7 @@ lck_grp_attr_t       *tz_slock_grp_attr;
 static void            setthetime(
                                        struct timeval  *tv);
 
-void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode")));
+void time_zone_slock_init(void);
 
 /* 
  * Time of day and interval timer support.
@@ -157,10 +159,8 @@ settimeofday(__unused struct proc *p, struct settimeofday_args  *uap, __unused i
        if (error)
                return (error);
 #endif
-#ifndef CONFIG_EMBEDDED
        if ((error = suser(kauth_cred_get(), &p->p_acflag)))
                return (error);
-#endif
        /* Verify all parameters before changing time */
        if (uap->tv) {
                if (IS_64BIT_PROCESS(p)) {
@@ -215,7 +215,7 @@ adjtime(struct proc *p, struct adjtime_args *uap, __unused int32_t *retval)
        if (error)
                return (error);
 #endif
-       if ((error = suser(kauth_cred_get(), &p->p_acflag)))
+       if ((error = priv_check_cred(kauth_cred_get(), PRIV_ADJTIME, 0)))
                return (error);
        if (IS_64BIT_PROCESS(p)) {
                struct user64_timeval user_atv;
@@ -431,7 +431,8 @@ setitimer(struct proc *p, struct setitimer_args *uap, int32_t *retval)
                        microuptime(&p->p_rtime);
                        timevaladd(&p->p_rtime, &aitv.it_value);
                        p->p_realtimer = aitv;
-                       if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime)))
+                       if (!thread_call_enter_delayed_with_leeway(p->p_rcall, NULL,
+                                                tvtoabstime(&p->p_rtime), 0, THREAD_CALL_DELAY_USER_NORMAL))
                                p->p_ractive++;
                } else  {
                        timerclear(&p->p_rtime);
@@ -653,6 +654,19 @@ microtime(
        tvp->tv_usec = tv_usec;
 }
 
+void
+microtime_with_abstime(
+       struct timeval  *tvp, uint64_t *abstime)
+{
+       clock_sec_t             tv_sec;
+       clock_usec_t    tv_usec;
+
+       clock_get_calendar_absolute_and_microtime(&tv_sec, &tv_usec, abstime);
+
+       tvp->tv_sec = tv_sec;
+       tvp->tv_usec = tv_usec;
+}
+
 void
 microuptime(
        struct timeval  *tvp)
@@ -708,6 +722,86 @@ tvtoabstime(
 
        return (result + usresult);
 }
+
+#if NETWORKING
+/*
+ * ratecheck(): simple time-based rate-limit checking.
+ */
+int
+ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
+{
+       struct timeval tv, delta;
+       int rv = 0;
+
+       net_uptime2timeval(&tv);
+       delta = tv;
+       timevalsub(&delta, lasttime);
+
+       /*
+        * check for 0,0 is so that the message will be seen at least once,
+        * even if interval is huge.
+        */
+       if (timevalcmp(&delta, mininterval, >=) ||
+           (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {
+               *lasttime = tv;
+               rv = 1;
+       }
+
+       return (rv);
+}
+
+/*
+ * ppsratecheck(): packets (or events) per second limitation.
+ */
+int
+ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
+{
+       struct timeval tv, delta;
+       int rv;
+
+       net_uptime2timeval(&tv);
+
+       timersub(&tv, lasttime, &delta);
+
+       /*
+        * Check for 0,0 so that the message will be seen at least once.
+        * If more than one second has passed since the last update of
+        * lasttime, reset the counter.
+        *
+        * we do increment *curpps even in *curpps < maxpps case, as some may
+        * try to use *curpps for stat purposes as well.
+        */
+       if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
+           delta.tv_sec >= 1) {
+               *lasttime = tv;
+               *curpps = 0;
+               rv = 1;
+       } else if (maxpps < 0)
+               rv = 1;
+       else if (*curpps < maxpps)
+               rv = 1;
+       else
+               rv = 0;
+
+#if 1 /* DIAGNOSTIC? */
+       /* be careful about wrap-around */
+       if (*curpps + 1 > 0)
+               *curpps = *curpps + 1;
+#else
+       /*
+        * assume that there's not too many calls to this function.
+        * not sure if the assumption holds, as it depends on *caller's*
+        * behavior, not the behavior of this function.
+        * IMHO it is wrong to make assumption on the caller's behavior,
+        * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
+        */
+       *curpps = *curpps + 1;
+#endif
+
+       return (rv);
+}
+#endif /* NETWORKING */
+
 void
 time_zone_slock_init(void)
 {