MEDIUM: protocol: store the socket and control type in the protocol array
The protocol array used to be only indexed by socket family, which is very
problematic with UDP (requiring an extra family) and with the forthcoming
QUIC (also requiring an extra family), especially since that binds them to
certain families, prevents them from supporting dgram UNIX sockets etc.
In order to address this, we now start to register the protocols with more
info, namely the socket type and the control type (either stream or dgram).
This is sufficient for the protocols we have to deal with, but could also
be extended further if multiple protocol variants were needed. But as is,
it still fits nicely in an array, which is convenient for lookups that are
instant.
diff --git a/src/protocol.c b/src/protocol.c
index 7485870..48bce76 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -24,7 +24,7 @@
/* List head of all registered protocols */
static struct list protocols = LIST_HEAD_INIT(protocols);
-struct protocol *__protocol_by_family[AF_CUST_MAX] = { };
+struct protocol *__protocol_by_family[AF_CUST_MAX][2][2] = { };
/* This is the global spinlock we may need to register/unregister listeners or
* protocols. Its main purpose is in fact to serialize the rare stop/deinit()
@@ -38,7 +38,9 @@
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
LIST_ADDQ(&protocols, &proto->list);
if (proto->sock_domain >= 0 && proto->sock_domain < AF_CUST_MAX)
- __protocol_by_family[proto->sock_domain] = proto;
+ __protocol_by_family[proto->sock_domain]
+ [proto->sock_type == SOCK_DGRAM]
+ [proto->ctrl_type == SOCK_DGRAM] = proto;
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}