From fb967676d21ffeb79cf1c118119b883721589d0b Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Fri, 16 Oct 2020 21:30:07 +0200
Subject: improve mgre

---
 gre.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gre.c b/gre.c
index 68f155c..3a44d8c 100644
--- a/gre.c
+++ b/gre.c
@@ -282,7 +282,7 @@ static int gre_ipv4(uint8_t **bufp, int *np)
     }
     // check source IPv4 address
     const struct sockaddr_in *remote_in = (const struct sockaddr_in *)&remote;
-    if (*(uint32_t *)(buf + 12) != remote_in->sin_addr.s_addr)
+    if (!remote_any && *(uint32_t *)(buf + 12) != remote_in->sin_addr.s_addr)
     {
         printf("Wrong IPv4 source\n");
         return -1;
@@ -328,7 +328,7 @@ static int gre_any(const uint8_t *buf, int n)
         return -1;
     }
     uint16_t protocol = ntohs(*(uint16_t *)(buf + 2));
-    if (type == IFF_TUN)
+    if (type == IFF_TUN || remote_any)
     {
         switch (protocol) {
         case ETHERTYPE_IP:
-- 
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