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Improve the performance of DHCP relay.

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On machines with many interfaces, enumerating them
via netlink on each packet reciept is slow,
and unneccesary. All we need is the local address->interface
mapping, which can be cached in the relay structures.
This commit is contained in:
Simon Kelley
2022-02-01 00:18:44 +00:00
parent dbceeb4178
commit 7fbf1cce7b
5 changed files with 217 additions and 207 deletions
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11
src/network.c
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@@ -1743,6 +1743,8 @@ int reload_servers(char *fname)
/* Called when addresses are added or deleted from an interface */
void newaddress(time_t now)
{
struct dhcp_relay *relay;
(void)now;
if (option_bool(OPT_CLEVERBIND) || option_bool(OPT_LOCAL_SERVICE) ||
@@ -1751,6 +1753,12 @@ void newaddress(time_t now)
if (option_bool(OPT_CLEVERBIND))
create_bound_listeners(0);
#ifdef HAVE_DHCP
/* clear cache of subnet->relay index */
for (relay = daemon->relay4; relay; relay = relay->next)
relay->iface_index = 0;
#endif
#ifdef HAVE_DHCP6
if (daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
@@ -1761,5 +1769,8 @@ void newaddress(time_t now)
if (daemon->doing_dhcp6)
lease_find_interfaces(now);
for (relay = daemon->relay6; relay; relay = relay->next)
relay->iface_index = 0;
#endif
}