From db1fe773a3eacbf2b3ce0b3333f1684291fa5c2d Mon Sep 17 00:00:00 2001
From: Stefano Brivio <sbrivio@redhat.com>
Date: Sun, 25 Apr 2021 13:34:04 +0200
Subject: tcp: Avoid SO_ACCEPTCONN getsockopt() by noting listening/data
 sockets numbers

...the rest is reshuffling existing macros to use the bits we need in
TCP code.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 util.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'util.h')

diff --git a/util.h b/util.h
index 139638c..34b8266 100644
--- a/util.h
+++ b/util.h
@@ -8,6 +8,25 @@ void debug(const char *format, ...);
 #define debug(...) { }
 #endif
 
+#define CHECK_SET_MIN_MAX(basename, fd)					\
+	do {								\
+		if ((fd) < basename##min)				\
+			basename##min = (fd);				\
+		if ((fd) > basename##max)				\
+			basename##max = (fd);				\
+	} while (0)
+
+#define CHECK_SET_MIN_MAX_PROTO_FD(proto, ipproto, proto_ctx, fd)	\
+	do {								\
+		if ((proto) == (ipproto))				\
+			CHECK_SET_MIN_MAX(c->proto_ctx.fd_, (fd));	\
+	} while (0)
+
+#define IN_INTERVAL(a, b, x) ((x) >= (a) && (x) <= (b))
+
+#define FD_PROTO(x, proto)						\
+	(IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x)))
+
 uint16_t csum_fold(uint32_t sum);
 uint16_t csum_ip4(void *buf, size_t len);
 void csum_tcp4(struct iphdr *iph);
-- 
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