From 709d6710d047566c71f03e579a02c3d99fe15a3e Mon Sep 17 00:00:00 2001 From: Patrik Flykt Date: Wed, 25 Jun 2014 15:37:58 +0300 Subject: [PATCH] sd-dhcp6-lease: Add helper function to compute remaining expiry time Create a helper function to compute the remaining time in seconds from time T2 to the IPv6 address with the longest lifetime. The computed time is used as the Maximum Retransmission Duration in Rebinding state. See RFC 3315, section 18.1.4. for details. --- src/libsystemd-network/dhcp6-lease-internal.h | 1 + src/libsystemd-network/sd-dhcp6-lease.c | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/src/libsystemd-network/dhcp6-lease-internal.h b/src/libsystemd-network/dhcp6-lease-internal.h index 295c223..62c16c5 100644 --- a/src/libsystemd-network/dhcp6-lease-internal.h +++ b/src/libsystemd-network/dhcp6-lease-internal.h @@ -42,6 +42,7 @@ struct sd_dhcp6_lease { }; int dhcp6_lease_clear_timers(DHCP6IA *ia); +int dhcp6_lease_ia_rebind_expire(const DHCP6IA *ia, uint32_t *expire); DHCP6IA *dhcp6_lease_free_ia(DHCP6IA *ia); int dhcp6_lease_set_serverid(sd_dhcp6_lease *lease, const uint8_t *id, diff --git a/src/libsystemd-network/sd-dhcp6-lease.c b/src/libsystemd-network/sd-dhcp6-lease.c index cbda7d8..17a4b64 100644 --- a/src/libsystemd-network/sd-dhcp6-lease.c +++ b/src/libsystemd-network/sd-dhcp6-lease.c @@ -33,6 +33,28 @@ int dhcp6_lease_clear_timers(DHCP6IA *ia) { return 0; } +int dhcp6_lease_ia_rebind_expire(const DHCP6IA *ia, uint32_t *expire) { + DHCP6Address *addr; + uint32_t valid = 0, t; + + assert_return(ia, -EINVAL); + assert_return(expire, -EINVAL); + + LIST_FOREACH(addresses, addr, ia->addresses) { + t = be32toh(addr->lifetime_valid); + if (valid < t) + valid = t; + } + + t = be32toh(ia->lifetime_t2); + if (t > valid) + return -EINVAL; + + *expire = valid - t; + + return 0; +} + DHCP6IA *dhcp6_lease_free_ia(DHCP6IA *ia) { DHCP6Address *address; -- 2.7.4