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sd-dhcp6-lease: Add helper function to compute remaining expiry time

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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.
This commit is contained in:
Patrik Flykt 2014-06-25 15:37:58 +03:00
parent da6fe470e1
commit 709d6710d0
2 changed files with 23 additions and 0 deletions
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1
src/libsystemd-network/dhcp6-lease-internal.h
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@ -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,

22
src/libsystemd-network/sd-dhcp6-lease.c
View File

@ -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;