busybox: update to 1.31.0

* Update busybox to version 1.31.0.
    New applets: ts, i2ctransfer
    New (restored) feature: error/info levels in syslog messages.
    Leave new features disabled by default.
* Refresh patches
* Remove patch that was backported from upstream

Config refreshed with commands below, after which the OpenWrt specific
config defaults (ipv6, login session child) were corrected:

  make package/busybox/compile   (to populate the build_dir)

  cd package/utils/busybox/config/
  ../convert_menuconfig.pl ../../../../build_dir/target-mips_24kc_musl/busybox-1.31.0

  cd package/utils/busybox
  ./convert_defaults.pl < ../../../build_dir/target-mips_24kc_musl/busybox-1.31.0/.config > Config-defaults.in

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

15 files changed, 81 insertions, 237 deletions

diff --git a/package/utils/busybox/Config-defaults.in b/package/utils/busybox/Config-defaults.in
index aa2f70e499..e81747be3c 100644
--- a/package/utils/busybox/Config-defaults.in
+++ b/package/utils/busybox/Config-defaults.in
@@ -79,6 +79,9 @@ config BUSYBOX_DEFAULT_SELINUX
 config BUSYBOX_DEFAULT_FEATURE_CLEAN_UP
 	bool
 	default n
+config BUSYBOX_DEFAULT_FEATURE_SYSLOG_INFO
+	bool
+	default n
 config BUSYBOX_DEFAULT_FEATURE_SYSLOG
 	bool
 	default y
@@ -601,9 +604,6 @@ config BUSYBOX_DEFAULT_FALSE
 config BUSYBOX_DEFAULT_FOLD
 	bool
 	default n
-config BUSYBOX_DEFAULT_FSYNC
-	bool
-	default y
 config BUSYBOX_DEFAULT_HEAD
 	bool
 	default y
@@ -790,6 +790,9 @@ config BUSYBOX_DEFAULT_SYNC
 config BUSYBOX_DEFAULT_FEATURE_SYNC_FANCY
 	bool
 	default n
+config BUSYBOX_DEFAULT_FSYNC
+	bool
+	default y
 config BUSYBOX_DEFAULT_TAC
 	bool
 	default n
@@ -1618,6 +1621,9 @@ config BUSYBOX_DEFAULT_FEATURE_MDEV_EXEC
 config BUSYBOX_DEFAULT_FEATURE_MDEV_LOAD_FIRMWARE
 	bool
 	default n
+config BUSYBOX_DEFAULT_FEATURE_MDEV_DAEMON
+	bool
+	default n
 config BUSYBOX_DEFAULT_MESG
 	bool
 	default n
@@ -2023,6 +2029,9 @@ config BUSYBOX_DEFAULT_I2CDUMP
 config BUSYBOX_DEFAULT_I2CDETECT
 	bool
 	default n
+config BUSYBOX_DEFAULT_I2CTRANSFER
+	bool
+	default n
 config BUSYBOX_DEFAULT_INOTIFYD
 	bool
 	default n
@@ -2125,6 +2134,9 @@ config BUSYBOX_DEFAULT_STRINGS
 config BUSYBOX_DEFAULT_TIME
 	bool
 	default y
+config BUSYBOX_DEFAULT_TS
+	bool
+	default n
 config BUSYBOX_DEFAULT_TTYSIZE
 	bool
 	default n
@@ -2504,6 +2516,9 @@ config BUSYBOX_DEFAULT_TFTP
 config BUSYBOX_DEFAULT_FEATURE_TFTP_PROGRESS_BAR
 	bool
 	default n
+config BUSYBOX_DEFAULT_FEATURE_TFTP_HPA_COMPAT
+	bool
+	default n
 config BUSYBOX_DEFAULT_TFTPD
 	bool
 	default n
@@ -3047,6 +3062,9 @@ config BUSYBOX_DEFAULT_FEATURE_SH_MATH
 config BUSYBOX_DEFAULT_FEATURE_SH_MATH_64
 	bool
 	default y
+config BUSYBOX_DEFAULT_FEATURE_SH_MATH_BASE
+	bool
+	default n
 config BUSYBOX_DEFAULT_FEATURE_SH_EXTRA_QUIET
 	bool
 	default n
diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index 9b80ed1f5e..1e1712fe71 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=busybox
-PKG_VERSION:=1.30.1
-PKG_RELEASE:=5
+PKG_VERSION:=1.31.0
+PKG_RELEASE:=1
 PKG_FLAGS:=essential
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://www.busybox.net/downloads \
 		http://sources.buildroot.net
-PKG_HASH:=3d1d04a4dbd34048f4794815a5c48ebb9eb53c5277e09ffffc060323b95dfbdc
+PKG_HASH:=0e4925392fd9f3743cc517e031b68b012b24a63b0cf6c1ff03cce7bb3846cc99
 
 PKG_BUILD_DEPENDS:=BUSYBOX_CONFIG_PAM:libpam
 PKG_BUILD_PARALLEL:=1
diff --git a/package/utils/busybox/config/Config.in b/package/utils/busybox/config/Config.in
index 74493aa475..8d1394c2e2 100644
--- a/package/utils/busybox/config/Config.in
+++ b/package/utils/busybox/config/Config.in
@@ -11,7 +11,7 @@ config BUSYBOX_CONFIG_HAVE_DOT_CONFIG
 menu "Settings"
 
 config BUSYBOX_CONFIG_DESKTOP
-	bool "Enable compatibility for full-blown desktop systems"
+	bool "Enable compatibility for full-blown desktop systems (8kb)"
 	default BUSYBOX_DEFAULT_DESKTOP
 	help
 	Enable applet options and features which are not essential.
@@ -338,6 +338,15 @@ config BUSYBOX_CONFIG_FEATURE_CLEAN_UP
 	Don't enable this unless you have a really good reason to clean
 	things up manually.
 
+config BUSYBOX_CONFIG_FEATURE_SYSLOG_INFO
+	bool "Support LOG_INFO level syslog messages"
+	default BUSYBOX_DEFAULT_FEATURE_SYSLOG_INFO
+	depends on BUSYBOX_CONFIG_FEATURE_SYSLOG
+	help
+	Applets which send their output to syslog use either LOG_INFO or
+	LOG_ERR log levels, but by disabling this option all messages will
+	be logged at the LOG_ERR level, saving just under 200 bytes.
+
 # These are auto-selected by other options
 
 config BUSYBOX_CONFIG_FEATURE_SYSLOG
diff --git a/package/utils/busybox/config/coreutils/Config.in b/package/utils/busybox/config/coreutils/Config.in
index 76e59a571d..c5cd54d7f6 100644
--- a/package/utils/busybox/config/coreutils/Config.in
+++ b/package/utils/busybox/config/coreutils/Config.in
@@ -131,7 +131,7 @@ config BUSYBOX_CONFIG_FEATURE_DATE_COMPAT
 	date -s (and other commands like touch -d) use more sensible
 	formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
 
-	With this option off, 'date DATE' is 'date -s DATE' support
+	With this option off, 'date DATE' and 'date -s DATE' support
 	the same format. With it on, 'date DATE' additionally supports
 	MMDDhhmm[[YY]YY][.ss] format.
 config BUSYBOX_CONFIG_DD
@@ -282,11 +282,6 @@ config BUSYBOX_CONFIG_FOLD
 	default BUSYBOX_DEFAULT_FOLD
 	help
 	Wrap text to fit a specific width.
-config BUSYBOX_CONFIG_FSYNC
-	bool "fsync (3.6 kb)"
-	default BUSYBOX_DEFAULT_FSYNC
-	help
-	fsync is used to flush file-related cached blocks to disk.
 config BUSYBOX_CONFIG_HEAD
 	bool "head (3.8 kb)"
 	default BUSYBOX_DEFAULT_HEAD
@@ -667,6 +662,11 @@ config BUSYBOX_CONFIG_FEATURE_SYNC_FANCY
 	help
 	sync -d FILE... executes fdatasync() on each FILE.
 	sync -f FILE... executes syncfs() on each FILE.
+config BUSYBOX_CONFIG_FSYNC
+	bool "fsync (3.6 kb)"
+	default BUSYBOX_DEFAULT_FSYNC
+	help
+	fsync is used to flush file-related cached blocks to disk.
 config BUSYBOX_CONFIG_TAC
 	bool "tac (3.9 kb)"
 	default BUSYBOX_DEFAULT_TAC
diff --git a/package/utils/busybox/config/miscutils/Config.in b/package/utils/busybox/config/miscutils/Config.in
index dfd04fbd56..6ce6d2d7e3 100644
--- a/package/utils/busybox/config/miscutils/Config.in
+++ b/package/utils/busybox/config/miscutils/Config.in
@@ -470,6 +470,13 @@ config BUSYBOX_CONFIG_I2CDETECT
 	help
 	Detect I2C chips.
 
+config BUSYBOX_CONFIG_I2CTRANSFER
+	bool "i2ctransfer (4.0 kb)"
+	default BUSYBOX_DEFAULT_I2CTRANSFER
+	select BUSYBOX_CONFIG_PLATFORM_LINUX
+	help
+	Send user-defined I2C messages in one transfer.
+
 config BUSYBOX_CONFIG_INOTIFYD
 	bool "inotifyd (3.6 kb)"
 	default BUSYBOX_DEFAULT_INOTIFYD  # doesn't build on Knoppix 5
@@ -728,6 +735,9 @@ config BUSYBOX_CONFIG_TIME
 	The time command runs the specified program with the given arguments.
 	When the command finishes, time writes a message to standard output
 	giving timing statistics about this program run.
+config BUSYBOX_CONFIG_TS
+	bool "ts (450 bytes)"
+	default BUSYBOX_DEFAULT_TS
 config BUSYBOX_CONFIG_TTYSIZE
 	bool "ttysize (432 bytes)"
 	default BUSYBOX_DEFAULT_TTYSIZE
diff --git a/package/utils/busybox/config/networking/Config.in b/package/utils/busybox/config/networking/Config.in
index a7d3d5a2e1..1a740d998e 100644
--- a/package/utils/busybox/config/networking/Config.in
+++ b/package/utils/busybox/config/networking/Config.in
@@ -972,6 +972,11 @@ config BUSYBOX_CONFIG_FEATURE_TFTP_PROGRESS_BAR
 	default BUSYBOX_DEFAULT_FEATURE_TFTP_PROGRESS_BAR
 	depends on BUSYBOX_CONFIG_TFTP
 
+config BUSYBOX_CONFIG_FEATURE_TFTP_HPA_COMPAT
+	bool "tftp-hpa compat (support -c get/put FILE)"
+	default BUSYBOX_DEFAULT_FEATURE_TFTP_HPA_COMPAT
+	depends on BUSYBOX_CONFIG_TFTP
+
 config BUSYBOX_CONFIG_TFTPD
 	bool "tftpd (10 kb)"
 	default BUSYBOX_DEFAULT_TFTPD
diff --git a/package/utils/busybox/config/networking/udhcp/Config.in b/package/utils/busybox/config/networking/udhcp/Config.in
index 212e4a0bcb..99d5bb9d21 100644
--- a/package/utils/busybox/config/networking/udhcp/Config.in
+++ b/package/utils/busybox/config/networking/udhcp/Config.in
@@ -104,7 +104,7 @@ config BUSYBOX_CONFIG_UDHCPC_DEFAULT_SCRIPT
 # udhcpc6 config is inserted here:
 config BUSYBOX_CONFIG_UDHCPC6
 	bool "udhcpc6 (21 kb)"
-	default BUSYBOX_DEFAULT_UDHCPC6  # not yet ready
+	default BUSYBOX_DEFAULT_UDHCPC6
 	depends on BUSYBOX_CONFIG_FEATURE_IPV6
 	help
 	udhcpc6 is a DHCPv6 client
diff --git a/package/utils/busybox/config/shell/Config.in b/package/utils/busybox/config/shell/Config.in
index ddaa333e04..1ae6eb042e 100644
--- a/package/utils/busybox/config/shell/Config.in
+++ b/package/utils/busybox/config/shell/Config.in
@@ -497,6 +497,11 @@ config BUSYBOX_CONFIG_FEATURE_SH_MATH_64
 	slightly larger, but will allow computation with very large numbers.
 	This is not in POSIX, so do not rely on this in portable code.
 
+config BUSYBOX_CONFIG_FEATURE_SH_MATH_BASE
+	bool "Support BASE#nnnn literals"
+	default BUSYBOX_DEFAULT_FEATURE_SH_MATH_BASE
+	depends on BUSYBOX_CONFIG_FEATURE_SH_MATH
+
 config BUSYBOX_CONFIG_FEATURE_SH_EXTRA_QUIET
 	bool "Hide message on interactive shell startup"
 	default BUSYBOX_DEFAULT_FEATURE_SH_EXTRA_QUIET
diff --git a/package/utils/busybox/config/util-linux/Config.in b/package/utils/busybox/config/util-linux/Config.in
index 20d7818f00..1cb2245e32 100644
--- a/package/utils/busybox/config/util-linux/Config.in
+++ b/package/utils/busybox/config/util-linux/Config.in
@@ -473,6 +473,17 @@ config BUSYBOX_CONFIG_FEATURE_MDEV_LOAD_FIRMWARE
 	These devices will request userspace look up the files in
 	/lib/firmware/ and if it exists, send it to the kernel for
 	loading into the hardware.
+
+config BUSYBOX_CONFIG_FEATURE_MDEV_DAEMON
+	bool "Support daemon mode"
+	default BUSYBOX_DEFAULT_FEATURE_MDEV_DAEMON
+	depends on BUSYBOX_CONFIG_MDEV
+	help
+	Adds the -d option to run mdev in daemon mode handling hotplug
+	events from the kernel like udev. If the system generates many
+	hotplug events this mode of operation will consume less
+	resources than registering mdev as hotplug helper or using the
+	uevent applet.
 config BUSYBOX_CONFIG_MESG
 	bool "mesg (1.4 kb)"
 	default BUSYBOX_DEFAULT_MESG
diff --git a/package/utils/busybox/patches/200-udhcpc_reduce_msgs.patch b/package/utils/busybox/patches/200-udhcpc_reduce_msgs.patch
index 2d61a2d77d..4bab25a8d5 100644
--- a/package/utils/busybox/patches/200-udhcpc_reduce_msgs.patch
+++ b/package/utils/busybox/patches/200-udhcpc_reduce_msgs.patch
@@ -13,6 +13,6 @@
  	add_client_options(&packet);
  
 +	if (msgs++ < 3)
- 	bb_error_msg("sending %s", "discover");
- 	return raw_bcast_from_client_config_ifindex(&packet, INADDR_ANY);
+ 	bb_info_msg("sending %s", "discover");
+ 	return raw_bcast_from_client_data_ifindex(&packet, INADDR_ANY);
  }
diff --git a/package/utils/busybox/patches/201-udhcpc_changed_ifindex.patch b/package/utils/busybox/patches/201-udhcpc_changed_ifindex.patch
index 51b15a73cc..256b049d9e 100644
--- a/package/utils/busybox/patches/201-udhcpc_changed_ifindex.patch
+++ b/package/utils/busybox/patches/201-udhcpc_changed_ifindex.patch
@@ -1,6 +1,6 @@
 --- a/networking/udhcp/dhcpc.c
 +++ b/networking/udhcp/dhcpc.c
-@@ -1417,6 +1417,12 @@ int udhcpc_main(int argc UNUSED_PARAM, c
+@@ -1416,6 +1416,12 @@ int udhcpc_main(int argc UNUSED_PARAM, c
  		/* silence "uninitialized!" warning */
  		unsigned timestamp_before_wait = timestamp_before_wait;
  
@@ -8,8 +8,8 @@
 +		 * member interfaces were added/removed or if the status of the
 +		 * bridge changed).
 +		 * Workaround: refresh it here before processing the next packet */
-+		udhcp_read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.client_mac);
++		udhcp_read_interface(client_data.interface, &client_data.ifindex, NULL, client_data.client_mac);
 +
- 		//bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode);
+ 		//bb_error_msg("sockfd:%d, listen_mode:%d", client_data.sockfd, client_data.listen_mode);
  
  		/* Was opening raw or udp socket here
diff --git a/package/utils/busybox/patches/203-udhcpc_renew_no_deconfig.patch b/package/utils/busybox/patches/203-udhcpc_renew_no_deconfig.patch
index 6f5d3cc8bf..3d3c0cc403 100644
--- a/package/utils/busybox/patches/203-udhcpc_renew_no_deconfig.patch
+++ b/package/utils/busybox/patches/203-udhcpc_renew_no_deconfig.patch
@@ -1,7 +1,7 @@
 --- a/networking/udhcp/dhcpc.c
 +++ b/networking/udhcp/dhcpc.c
-@@ -1128,7 +1128,6 @@ static void perform_renew(void)
- 		state = RENEW_REQUESTED;
+@@ -1126,7 +1126,6 @@ static void perform_renew(void)
+ 		client_data.state = RENEW_REQUESTED;
  		break;
  	case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
 -		udhcp_run_script(NULL, "deconfig");
diff --git a/package/utils/busybox/patches/240-telnetd_intr.patch b/package/utils/busybox/patches/240-telnetd_intr.patch
index fec2a3a5d0..773ba44db5 100644
--- a/package/utils/busybox/patches/240-telnetd_intr.patch
+++ b/package/utils/busybox/patches/240-telnetd_intr.patch
@@ -1,6 +1,6 @@
 --- a/networking/telnetd.c
 +++ b/networking/telnetd.c
-@@ -497,6 +497,7 @@ make_new_session(
+@@ -509,6 +509,7 @@ make_new_session(
  
  	/* Restore default signal handling ASAP */
  	bb_signals((1 << SIGCHLD) + (1 << SIGPIPE), SIG_DFL);
diff --git a/package/utils/busybox/patches/250-date-k-flag.patch b/package/utils/busybox/patches/250-date-k-flag.patch
index 3a85312e2f..5aadbb233c 100644
--- a/package/utils/busybox/patches/250-date-k-flag.patch
+++ b/package/utils/busybox/patches/250-date-k-flag.patch
@@ -2,7 +2,7 @@
 +++ b/coreutils/date.c
 @@ -123,6 +123,7 @@
  //usage:	IF_FEATURE_DATE_ISOFMT(
- //usage:     "\n	-D FMT		Use FMT for -d TIME conversion"
+ //usage:     "\n	-D FMT		Use FMT (strptime format) for -d TIME conversion"
  //usage:	)
 +//usage:     "\n	-k		Set Kernel timezone from localtime and exit"
  //usage:     "\n"
diff --git a/package/utils/busybox/patches/530-ip-use-rtnl_send_check-on-flush-commands.patch b/package/utils/busybox/patches/530-ip-use-rtnl_send_check-on-flush-commands.patch
deleted file mode 100644
index 0e8ec37f80..0000000000
--- a/package/utils/busybox/patches/530-ip-use-rtnl_send_check-on-flush-commands.patch
+++ /dev/null
@@ -1,214 +0,0 @@
-From 028c5aa18b5273c029f0278232d922ee1a164de6 Mon Sep 17 00:00:00 2001
-From: Denys Vlasenko <vda.linux@googlemail.com>
-Date: Wed, 22 May 2019 13:54:46 +0200
-Subject: ip: use rtnl_send_check() on flush commands, closes 6962
-
-function                                             old     new   delta
-rtnl_send_check                                        -     160    +160
-xrtnl_wilddump_request                                64      66      +2
-ipneigh_list_or_flush                                714     706      -8
-rtnl_send                                             69       -     -69
-------------------------------------------------------------------------------
-(add/remove: 1/1 grow/shrink: 1/1 up/down: 162/-77)            Total: 85 bytes
-
-Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
----
- networking/libiproute/ipaddress.c  |  6 ++++--
- networking/libiproute/ipneigh.c    |  9 ++++----
- networking/libiproute/iproute.c    |  5 ++++-
- networking/libiproute/libnetlink.c | 43 +++++++++++++++++++++++++++++++-------
- networking/libiproute/libnetlink.h | 19 +++++++++++++++--
- 5 files changed, 65 insertions(+), 17 deletions(-)
-
---- a/networking/libiproute/ipaddress.c
-+++ b/networking/libiproute/ipaddress.c
-@@ -23,6 +23,7 @@
- 
- struct filter_t {
- 	char *label;
-+	/* Flush cmd buf. If !NULL, print_addrinfo() constructs flush commands in it */
- 	char *flushb;
- 	struct rtnl_handle *rth;
- 	int scope, scopemask;
-@@ -34,6 +35,8 @@ struct filter_t {
- 	smallint showqueue;
- 	smallint oneline;
- 	smallint up;
-+	/* Misnomer. Does not mean "flushed something" */
-+	/* More like "flush commands were constructed by print_addrinfo()" */
- 	smallint flushed;
- 	inet_prefix pfx;
- } FIX_ALIASING;
-@@ -201,7 +204,7 @@ static NOINLINE int print_linkinfo(const
- 
- static int flush_update(void)
- {
--	if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
-+	if (rtnl_send_check(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
- 		bb_perror_msg("can't send flush request");
- 		return -1;
- 	}
-@@ -507,7 +510,6 @@ int FAST_FUNC ipaddr_list_or_flush(char
- 		xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
- 	}
- 
--
- 	if (G_filter.family && G_filter.family != AF_PACKET) {
- 		struct nlmsg_list **lp;
- 		lp = &linfo;
---- a/networking/libiproute/ipneigh.c
-+++ b/networking/libiproute/ipneigh.c
-@@ -32,7 +32,10 @@ struct filter_t {
- 	int state;
- 	int unused_only;
- 	inet_prefix pfx;
-+	/* Misnomer. Does not mean "flushed N something" */
-+	/* More like "no_of_flush_commands_constructed_by_print_neigh()" */
- 	int flushed;
-+	/* Flush cmd buf. If !NULL, print_neigh() constructs flush commands in it */
- 	char *flushb;
- 	int flushp;
- 	int flushe;
-@@ -45,7 +48,7 @@ typedef struct filter_t filter_t;
- 
- static int flush_update(void)
- {
--	if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
-+	if (rtnl_send_check(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
- 		bb_perror_msg("can't send flush request");
- 		return -1;
- 	}
-@@ -299,9 +302,7 @@ static int FAST_FUNC ipneigh_list_or_flu
- 		G_filter.rth = &rth;
- 
- 		while (round < MAX_ROUNDS) {
--			if (xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETNEIGH) < 0) {
--				bb_perror_msg_and_die("can't send dump request");
--			}
-+			xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETNEIGH);
- 			G_filter.flushed = 0;
- 			if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
- 				bb_perror_msg_and_die("flush terminated");
---- a/networking/libiproute/iproute.c
-+++ b/networking/libiproute/iproute.c
-@@ -26,7 +26,10 @@
- 
- struct filter_t {
- 	int tb;
-+	/* Misnomer. Does not mean "flushed something" */
-+	/* More like "flush commands were constructed by print_route()" */
- 	smallint flushed;
-+	/* Flush cmd buf. If !NULL, print_route() constructs flush commands in it */
- 	char *flushb;
- 	int flushp;
- 	int flushe;
-@@ -53,7 +56,7 @@ typedef struct filter_t filter_t;
- 
- static int flush_update(void)
- {
--	if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
-+	if (rtnl_send_check(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
- 		bb_perror_msg("can't send flush request");
- 		return -1;
- 	}
---- a/networking/libiproute/libnetlink.c
-+++ b/networking/libiproute/libnetlink.c
-@@ -34,7 +34,7 @@ void FAST_FUNC xrtnl_open(struct rtnl_ha
- 	rth->seq = time(NULL);
- }
- 
--int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
-+void FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
- {
- 	struct {
- 		struct nlmsghdr nlh;
-@@ -48,18 +48,45 @@ int FAST_FUNC xrtnl_wilddump_request(str
- 	req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
- 	req.g.rtgen_family = family;
- 
--	return rtnl_send(rth, (void*)&req, sizeof(req));
-+	rtnl_send(rth, (void*)&req, sizeof(req));
- }
- 
--//TODO: pass rth->fd instead of full rth?
--int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len)
-+/* A version which checks for e.g. EPERM errors.
-+ * Try: setuidgid 1:1 ip addr flush dev eth0
-+ */
-+int FAST_FUNC rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len)
- {
--	struct sockaddr_nl nladdr;
-+	struct nlmsghdr *h;
-+	int status;
-+	char resp[1024];
-+
-+	status = write(rth->fd, buf, len);
-+	if (status < 0)
-+		return status;
-+
-+	/* Check for immediate errors */
-+	status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK);
-+	if (status < 0) {
-+		if (errno == EAGAIN) /* if no error, this happens */
-+			return 0;
-+		return -1;
-+	}
-+
-+	for (h = (struct nlmsghdr *)resp;
-+	    NLMSG_OK(h, status);
-+	    h = NLMSG_NEXT(h, status)
-+	) {
-+		if (h->nlmsg_type == NLMSG_ERROR) {
-+			struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
-+			if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
-+				bb_error_msg("ERROR truncated");
-+			else
-+				errno = -err->error;
-+			return -1;
-+		}
-+	}
- 
--	memset(&nladdr, 0, sizeof(nladdr));
--	nladdr.nl_family = AF_NETLINK;
--
--	return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
-+	return 0;
- }
- 
- int FAST_FUNC rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
---- a/networking/libiproute/libnetlink.h
-+++ b/networking/libiproute/libnetlink.h
-@@ -20,7 +20,7 @@ struct rtnl_handle {
- 
- extern void xrtnl_open(struct rtnl_handle *rth) FAST_FUNC;
- #define rtnl_close(rth) (close((rth)->fd))
--extern int xrtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type) FAST_FUNC;
-+extern void xrtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type) FAST_FUNC;
- extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) FAST_FUNC;
- extern int xrtnl_dump_filter(struct rtnl_handle *rth,
- 		int (*filter)(const struct sockaddr_nl*, struct nlmsghdr *n, void*) FAST_FUNC,
-@@ -34,8 +34,23 @@ extern int rtnl_talk(struct rtnl_handle
- 		int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
- 		void *jarg) FAST_FUNC;
- 
--extern int rtnl_send(struct rtnl_handle *rth, char *buf, int) FAST_FUNC;
-+int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len) FAST_FUNC;
-+//TODO: pass rth->fd instead of full rth?
-+static ALWAYS_INLINE void rtnl_send(struct rtnl_handle *rth, const void *buf, int len)
-+{
-+	// Used to be:
-+	//struct sockaddr_nl nladdr;
-+	//memset(&nladdr, 0, sizeof(nladdr));
-+	//nladdr.nl_family = AF_NETLINK;
-+	//return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
- 
-+	// iproute2-4.2.0 simplified the above to:
-+	//return send(rth->fd, buf, len, 0);
-+
-+	// We are using even shorter:
-+	xwrite(rth->fd, buf, len);
-+	// and convert to void, inline.
-+}
- 
- extern int addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data) FAST_FUNC;
- extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen) FAST_FUNC;