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sd-dhcp6-lease: adjust information refresh time with lifetime of IA_PD

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For the case when IRT is too large but lifetime of IA_PD is too short.
This commit is contained in:
Yu Watanabe 2024-09-16 05:02:06 +09:00
parent 180cc5421d
commit cf7a403e47
1 changed files with 29 additions and 6 deletions
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35
src/libsystemd-network/sd-dhcp6-lease.c
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@ -71,6 +71,32 @@ static void dhcp6_lease_set_lifetime(sd_dhcp6_lease *lease) {
lease->lifetime_t2 = t2;
}
static void dhcp6_client_set_information_refresh_time(sd_dhcp6_client *client, sd_dhcp6_lease *lease, usec_t irt) {
usec_t t1 = USEC_INFINITY, t2 = USEC_INFINITY, min_valid_lt = USEC_INFINITY;
if (lease->ia_pd) {
t1 = be32_sec_to_usec(lease->ia_pd->header.lifetime_t1, /* max_as_infinity = */ true);
t2 = be32_sec_to_usec(lease->ia_pd->header.lifetime_t2, /* max_as_infinity = */ true);
LIST_FOREACH(addresses, a, lease->ia_pd->addresses)
min_valid_lt = MIN(min_valid_lt, be32_sec_to_usec(a->iapdprefix.lifetime_valid, /* max_as_infinity = */ true));
if (t2 == 0 || t2 > min_valid_lt) {
/* If T2 is zero or longer than the minimum valid lifetime of the prefixes,
* then adjust lifetime with it. */
t1 = min_valid_lt / 2;
t2 = min_valid_lt / 10 * 8;
}
/* Adjust the received information refresh time with T1. */
irt = MIN(irt, t1);
}
client->information_refresh_time_usec = MAX(irt, IRT_MINIMUM);
log_dhcp6_client(client, "New information request will be refused in %s.",
FORMAT_TIMESPAN(client->information_refresh_time_usec, USEC_PER_SEC));
}
#define DEFINE_GET_TIME_FUNCTIONS(name, val) \
int sd_dhcp6_lease_get_##name( \
sd_dhcp6_lease *lease, \
@ -865,12 +891,9 @@ static int dhcp6_lease_parse_message(
"The client ID in %s message does not match. Ignoring.",
dhcp6_message_type_to_string(message->type));
if (client->state == DHCP6_STATE_INFORMATION_REQUEST) {
client->information_refresh_time_usec = MAX(irt, IRT_MINIMUM);
log_dhcp6_client(client, "New information request will be refused in %s.",
FORMAT_TIMESPAN(client->information_refresh_time_usec, USEC_PER_SEC));
} else {
if (client->state == DHCP6_STATE_INFORMATION_REQUEST)
dhcp6_client_set_information_refresh_time(client, lease, irt);
else {
r = dhcp6_lease_get_serverid(lease, NULL, NULL);
if (r < 0)
return log_dhcp6_client_errno(client, r, "%s has no server id",