MINOR: tcp: add support for defer-accept on FreeBSD.
FreeBSD has a kernel feature (accf) and a sockopt flag similar to the
Linux's TCP_DEFER_ACCEPT to filter incoming data upon ACK. The main
difference is the filter needs to be placed when the socket actually
listens.
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index a534153..53569a9 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -708,6 +708,18 @@
goto tcp_close_return;
}
+#if !defined(TCP_DEFER_ACCEPT) && defined(SO_ACCEPTFILTER)
+ /* the socket needs to listen first */
+ if (listener->options & LI_O_DEF_ACCEPT) {
+ struct accept_filter_arg accept;
+ memset(&accept, 0, sizeof(accept));
+ strcpy(accept.af_name, "dataready");
+ if (setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &accept, sizeof(accept)) == -1) {
+ msg = "cannot enable ACCEPT_FILTER";
+ err |= ERR_WARN;
+ }
+ }
+#endif
#if defined(TCP_QUICKACK)
if (listener->options & LI_O_NOQUICKACK)
setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, &zero, sizeof(zero));