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dhcpv6-ia: add some noise to the T1 and T2 periods #207

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dhcpv6-ia: add some noise to the T1 and T2 periods #207

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7 changes: 5 additions & 2 deletions src/dhcpv6-ia.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1149,8 +1149,11 @@ static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
/* UINT32_MAX is considered as infinite leasetime */
a->preferred_until = (pref == UINT32_MAX) ? 0 : pref + now;

o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
/* if there's sufficient time left, subtract a pseudo random 127 seconds from the refresh timers */
o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : (pref > 256) ?
pref * 5 / 10 - ((rand() >> 8) & 0x7f) : pref * 5 / 10);
o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : (pref > 256) ?
pref * 8 / 10 - ((rand() >> 8) & 0x7f) : pref * 8 / 10);

if (!o_ia.t1)
o_ia.t1 = htonl(1);
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