system/{easy-kernel,musl}: fix struct iphdr UAPI thing

1 files changed, 47 insertions, 0 deletions

diff --git a/system/easy-kernel/uapi-iphdr.patch b/system/easy-kernel/uapi-iphdr.patch
new file mode 100644
index 000000000..8436b035b
--- /dev/null
+++ b/system/easy-kernel/uapi-iphdr.patch
@@ -0,0 +1,47 @@
+From 62689a5371ff8bbfc8c04625794c62d957b0863f Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Sat, 21 Dec 2019 23:36:33 -0600
+Subject: [PATCH] uapi: Prevent redefinition of struct iphdr
+
+As with struct ethhdr, the musl libc provides its own definition of the
+iphdr struct.  This guard ensures software like net-tools builds correctly
+on the musl libc.
+
+The __UAPI_DEF_IPHDR definition is in ip.h itself to prevent the issue in
+commit da360299b673 ("uapi/if_ether.h: move __UAPI_DEF_ETHHDR libc define")
+from being seen here.
+
+Signed-off-by: A. Wilcox <AWilcox@Wilcox-Tech.com>
+---
+ include/uapi/linux/ip.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/include/uapi/linux/ip.h b/include/uapi/linux/ip.h
+index e42d13b55cf3..d34a0d295672 100644
+--- a/include/uapi/linux/ip.h
++++ b/include/uapi/linux/ip.h
+@@ -83,6 +83,13 @@
+ 
+ #define IPV4_BEET_PHMAXLEN 8
+ 
++/* Allow libcs to deactivate this - musl has its own copy in <netinet/ip.h> */
++
++#ifndef __UAPI_DEF_IPHDR
++#define __UAPI_DEF_IPHDR	1
++#endif
++
++#if __UAPI_DEF_IPHDR
+ struct iphdr {
+ #if defined(__LITTLE_ENDIAN_BITFIELD)
+ 	__u8	ihl:4,
+@@ -104,6 +111,7 @@ struct iphdr {
+ 	__be32	daddr;
+ 	/*The options start here. */
+ };
++#endif
+ 
+ 
+ struct ip_auth_hdr {
+-- 
+2.22.1
+