batctl: Merge bugfixes from 2020.2

* fix endianness when reading radiotap header
* Only remove batadv interface on hardif reduction

Signed-off-by: Sven Eckelmann <sven@narfation.org>

batctl/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=batctl
 
 PKG_VERSION:=2018.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_HASH:=27877d0da6916f88a6cecbbb3f3d23cc4558ef7c7294324bf4fd050ed606b553
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz

batctl/patches/0002-batctl-fix-endianness-when-reading-radiotap-header.patch

@@ -0,0 +1,38 @@
+From: Marek Lindner <mareklindner@neomailbox.ch>
+Date: Wed, 29 Apr 2020 12:09:44 +0200
+Subject: batctl: fix endianness when reading radiotap header
+
+All radiotap header fields are specified in little endian byte-order.
+Header length conversion is necessary on some platforms.
+
+Fixes: c6fcdb6dc9a9 ("batctl: add radiotap wifi packet decapsulation support")
+Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+
+Origin: upstream, https://git.open-mesh.org/batctl.git/commit/440ae55a6ef96eb73ee628f9237915cf9fb26dee
+
+diff --git a/tcpdump.c b/tcpdump.c
+index dc4ccd37c3ddf8650cb79737defd923fe9f33c64..c41500e21eda0abc1f024a3265c23fc3a4802d17 100644
+--- a/tcpdump.c
++++ b/tcpdump.c
+@@ -29,6 +29,7 @@
+ #include <time.h>
+ #include <sys/time.h>
+ #include <arpa/inet.h>
++#include <endian.h>
+ #include <net/if.h>
+ #include <net/if_arp.h>
+ #include <netinet/in.h>
+@@ -1048,10 +1049,10 @@ static int monitor_header_length(unsigned char *packet_buff, ssize_t buff_len, i
+ 			return -1;
+ 
+ 		radiotap_hdr = (struct radiotap_header*)packet_buff;
+-		if (buff_len <= radiotap_hdr->it_len)
++		if (buff_len <= le16toh(radiotap_hdr->it_len))
+ 			return -1;
+ 		else
+-			return radiotap_hdr->it_len;
++			return le16toh(radiotap_hdr->it_len);
+ 	}
+ 
+ 	return -1;

batctl/patches/0003-batctl-Only-remove-batadv-interface-on-hardif-reduct.patch

@@ -0,0 +1,49 @@
+From: Sven Eckelmann <sven@narfation.org>
+Date: Sat, 13 Jun 2020 17:59:34 +0200
+Subject: batctl: Only remove batadv interface on hardif reduction
+
+A deletion of a hardif from a batadv meshif will also get a success reply
+from the kernel when the hardif was never part of the batadv meshif. If the
+batadv meshif had no attached hardifs before the removal was started, then
+users are then not expecting that the batadv meshif is removed at all.
+
+Since the delete operation is not an atomic compare-and-swap operation,
+just check first the number of attached interfaces and only start the
+removal of the batadv meshif when the number attached hardifs was reduced.
+
+Fixes: 25022e0b154d ("batctl: Use rtnl to add/remove interfaces")
+Reported-by: Matthias Schiffer <mschiffer@universe-factory.net>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+
+Origin: upstream, https://git.open-mesh.org/batctl.git/commit/6d49a82cf58ee5ebd6235b6ddaca46febd42f876
+
+diff --git a/interface.c b/interface.c
+index 5951b471c6477e78ff557e97a7478ba774a0aa20..1ad36826fdb91a3e0254ed4dec758e7c383596e9 100644
+--- a/interface.c
++++ b/interface.c
+@@ -305,6 +305,7 @@ int interface(char *mesh_iface, int argc, char **argv)
+ 	int ret;
+ 	unsigned int ifindex;
+ 	unsigned int ifmaster;
++	unsigned int pre_cnt;
+ 	const char *long_op;
+ 	unsigned int cnt;
+ 	int rest_argc;
+@@ -421,6 +422,8 @@ int interface(char *mesh_iface, int argc, char **argv)
+ 		goto err;
+ 	}
+ 
++	pre_cnt = count_interfaces(mesh_iface);
++
+ 	for (i = 1; i < rest_argc; i++) {
+ 		ifindex = if_nametoindex(rest_argv[i]);
+ 
+@@ -450,7 +453,7 @@ int interface(char *mesh_iface, int argc, char **argv)
+ 	/* check if there is no interface left and then destroy mesh_iface */
+ 	if (!manual_mode && rest_argv[0][0] == 'd') {
+ 		cnt = count_interfaces(mesh_iface);
+-		if (cnt == 0)
++		if (cnt == 0 && pre_cnt > 0)
+ 			destroy_interface(mesh_iface);
+ 	}
+