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Merge pull request #21175 from tohojo/dhcp-server-expire

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sd-dhcp-server: clear out expired leases when finding new address
This commit is contained in:
Yu Watanabe 2021-10-30 04:13:40 +09:00 committed by GitHub
commit 6db9b30066
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 41 additions and 2 deletions
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43
src/libsystemd-network/sd-dhcp-server.c
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@ -854,6 +854,38 @@ static int prepare_new_lease(
return 0;
}
static int dhcp_server_cleanup_expired_leases(sd_dhcp_server *server) {
DHCPLease *lease;
usec_t time_now;
int r;
assert(server);
r = sd_event_now(server->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
return r;
HASHMAP_FOREACH(lease, server->bound_leases_by_client_id) {
if (lease->expiration < time_now) {
log_dhcp_server(server, "CLEAN (0x%x)", be32toh(lease->address));
dhcp_lease_free(lease);
}
}
return 0;
}
static bool address_available(sd_dhcp_server *server, be32_t address) {
assert(server);
if (hashmap_contains(server->bound_leases_by_address, UINT32_TO_PTR(address)) ||
hashmap_contains(server->static_leases_by_address, UINT32_TO_PTR(address)) ||
address == server->address)
return false;
return true;
}
#define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30)
int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, size_t length) {
@ -883,6 +915,10 @@ int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, siz
/* this only fails on critical errors */
return r;
r = dhcp_server_cleanup_expired_leases(server);
if (r < 0)
return r;
existing_lease = hashmap_get(server->bound_leases_by_client_id, &req->client_id);
static_lease = hashmap_get(server->static_leases_by_client_id, &req->client_id);
@ -918,8 +954,7 @@ int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, siz
be32_t tmp_address;
tmp_address = server->subnet | htobe32(server->pool_offset + (hash + i) % server->pool_size);
if (!hashmap_contains(server->bound_leases_by_address, &tmp_address) &&
!hashmap_contains(server->static_leases_by_address, &tmp_address)) {
if (address_available(server, tmp_address)) {
address = tmp_address;
break;
}
@ -996,6 +1031,10 @@ int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, siz
address = req->message->ciaddr;
}
/* disallow our own address */
if (address == server->address)
return 0;
pool_offset = get_pool_offset(server, address);
existing_lease_by_address = hashmap_get(server->bound_leases_by_address, UINT32_TO_PTR(address));