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* [PATCH net 0/3] wireguard fixes for 5.6-rc2
@ 2020-02-14 13:34 Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 1/3] wireguard: selftests: reduce complexity and fix make races Jason A. Donenfeld
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Jason A. Donenfeld @ 2020-02-14 13:34 UTC (permalink / raw)
  To: davem, netdev; +Cc: Jason A. Donenfeld

Here are three fixes for wireguard collected since rc1:

1) Some small cleanups to the test suite to help massively parallel
   builds.

2) A change in how we reset our load calculation to avoid a more
   expensive comparison, suggested by Matt Dunwoodie.

3) I've been loading more and more of wireguard's surface into
   syzkaller, trying to get our coverage as complete as possible,
   leading in this case to a fix for mtu=0 devices.

Jason A. Donenfeld (3):
  wireguard: selftests: reduce complexity and fix make races
  wireguard: receive: reset last_under_load to zero
  wireguard: send: account for mtu=0 devices

 drivers/net/wireguard/device.c                |  7 ++--
 drivers/net/wireguard/receive.c               |  7 +++-
 drivers/net/wireguard/send.c                  |  3 +-
 .../testing/selftests/wireguard/qemu/Makefile | 38 +++++++------------
 4 files changed, 25 insertions(+), 30 deletions(-)

-- 
2.25.0


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH net 1/3] wireguard: selftests: reduce complexity and fix make races
  2020-02-14 13:34 [PATCH net 0/3] wireguard fixes for 5.6-rc2 Jason A. Donenfeld
@ 2020-02-14 13:34 ` Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 2/3] wireguard: receive: reset last_under_load to zero Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 3/3] wireguard: send: account for mtu=0 devices Jason A. Donenfeld
  2 siblings, 0 replies; 6+ messages in thread
From: Jason A. Donenfeld @ 2020-02-14 13:34 UTC (permalink / raw)
  To: davem, netdev; +Cc: Jason A. Donenfeld

This gives us fewer dependencies and shortens build time, fixes up some
hash checking race conditions, and also fixes missing directory creation
that caused issues on massively parallel builds.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 .../testing/selftests/wireguard/qemu/Makefile | 38 +++++++------------
 1 file changed, 14 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/wireguard/qemu/Makefile b/tools/testing/selftests/wireguard/qemu/Makefile
index f10aa3590adc..28d477683e8a 100644
--- a/tools/testing/selftests/wireguard/qemu/Makefile
+++ b/tools/testing/selftests/wireguard/qemu/Makefile
@@ -38,19 +38,17 @@ endef
 define file_download =
 $(DISTFILES_PATH)/$(1):
 	mkdir -p $(DISTFILES_PATH)
-	flock -x $$@.lock -c '[ -f $$@ ] && exit 0; wget -O $$@.tmp $(MIRROR)$(1) || wget -O $$@.tmp $(2)$(1) || rm -f $$@.tmp'
-	if echo "$(3)  $$@.tmp" | sha256sum -c -; then mv $$@.tmp $$@; else rm -f $$@.tmp; exit 71; fi
+	flock -x $$@.lock -c '[ -f $$@ ] && exit 0; wget -O $$@.tmp $(MIRROR)$(1) || wget -O $$@.tmp $(2)$(1) || rm -f $$@.tmp; [ -f $$@.tmp ] || exit 1; if echo "$(3)  $$@.tmp" | sha256sum -c -; then mv $$@.tmp $$@; else rm -f $$@.tmp; exit 71; fi'
 endef
 
 $(eval $(call tar_download,MUSL,musl,1.1.24,.tar.gz,https://www.musl-libc.org/releases/,1370c9a812b2cf2a7d92802510cca0058cc37e66a7bedd70051f0a34015022a3))
-$(eval $(call tar_download,LIBMNL,libmnl,1.0.4,.tar.bz2,https://www.netfilter.org/projects/libmnl/files/,171f89699f286a5854b72b91d06e8f8e3683064c5901fb09d954a9ab6f551f81))
 $(eval $(call tar_download,IPERF,iperf,3.7,.tar.gz,https://downloads.es.net/pub/iperf/,d846040224317caf2f75c843d309a950a7db23f9b44b94688ccbe557d6d1710c))
 $(eval $(call tar_download,BASH,bash,5.0,.tar.gz,https://ftp.gnu.org/gnu/bash/,b4a80f2ac66170b2913efbfb9f2594f1f76c7b1afd11f799e22035d63077fb4d))
 $(eval $(call tar_download,IPROUTE2,iproute2,5.4.0,.tar.xz,https://www.kernel.org/pub/linux/utils/net/iproute2/,fe97aa60a0d4c5ac830be18937e18dc3400ca713a33a89ad896ff1e3d46086ae))
 $(eval $(call tar_download,IPTABLES,iptables,1.8.4,.tar.bz2,https://www.netfilter.org/projects/iptables/files/,993a3a5490a544c2cbf2ef15cf7e7ed21af1845baf228318d5c36ef8827e157c))
 $(eval $(call tar_download,NMAP,nmap,7.80,.tar.bz2,https://nmap.org/dist/,fcfa5a0e42099e12e4bf7a68ebe6fde05553383a682e816a7ec9256ab4773faa))
 $(eval $(call tar_download,IPUTILS,iputils,s20190709,.tar.gz,https://github.com/iputils/iputils/archive/s20190709.tar.gz/#,a15720dd741d7538dd2645f9f516d193636ae4300ff7dbc8bfca757bf166490a))
-$(eval $(call tar_download,WIREGUARD_TOOLS,wireguard-tools,1.0.20191226,.tar.xz,https://git.zx2c4.com/wireguard-tools/snapshot/,aa8af0fdc9872d369d8c890a84dbc2a2466b55795dccd5b47721b2d97644b04f))
+$(eval $(call tar_download,WIREGUARD_TOOLS,wireguard-tools,1.0.20200206,.tar.xz,https://git.zx2c4.com/wireguard-tools/snapshot/,f5207248c6a3c3e3bfc9ab30b91c1897b00802ed861e1f9faaed873366078c64))
 
 KERNEL_BUILD_PATH := $(BUILD_PATH)/kernel$(if $(findstring yes,$(DEBUG_KERNEL)),-debug)
 rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) $(filter $(subst *,%,$2),$d))
@@ -295,21 +293,13 @@ $(IPERF_PATH)/src/iperf3: | $(IPERF_PATH)/.installed $(USERSPACE_DEPS)
 	$(MAKE) -C $(IPERF_PATH)
 	$(STRIP) -s $@
 
-$(LIBMNL_PATH)/.installed: $(LIBMNL_TAR)
-	flock -s $<.lock tar -C $(BUILD_PATH) -xf $<
-	touch $@
-
-$(LIBMNL_PATH)/src/.libs/libmnl.a: | $(LIBMNL_PATH)/.installed $(USERSPACE_DEPS)
-	cd $(LIBMNL_PATH) && ./configure --prefix=/ $(CROSS_COMPILE_FLAG) --enable-static --disable-shared
-	$(MAKE) -C $(LIBMNL_PATH)
-	sed -i 's:prefix=.*:prefix=$(LIBMNL_PATH):' $(LIBMNL_PATH)/libmnl.pc
-
 $(WIREGUARD_TOOLS_PATH)/.installed: $(WIREGUARD_TOOLS_TAR)
+	mkdir -p $(BUILD_PATH)
 	flock -s $<.lock tar -C $(BUILD_PATH) -xf $<
 	touch $@
 
-$(WIREGUARD_TOOLS_PATH)/src/wg: | $(WIREGUARD_TOOLS_PATH)/.installed $(LIBMNL_PATH)/src/.libs/libmnl.a $(USERSPACE_DEPS)
-	LDFLAGS="$(LDFLAGS) -L$(LIBMNL_PATH)/src/.libs" $(MAKE) -C $(WIREGUARD_TOOLS_PATH)/src LIBMNL_CFLAGS="-I$(LIBMNL_PATH)/include" LIBMNL_LDLIBS="-lmnl" wg
+$(WIREGUARD_TOOLS_PATH)/src/wg: | $(WIREGUARD_TOOLS_PATH)/.installed $(USERSPACE_DEPS)
+	$(MAKE) -C $(WIREGUARD_TOOLS_PATH)/src wg
 	$(STRIP) -s $@
 
 $(BUILD_PATH)/init: init.c | $(USERSPACE_DEPS)
@@ -340,17 +330,17 @@ $(BASH_PATH)/bash: | $(BASH_PATH)/.installed $(USERSPACE_DEPS)
 $(IPROUTE2_PATH)/.installed: $(IPROUTE2_TAR)
 	mkdir -p $(BUILD_PATH)
 	flock -s $<.lock tar -C $(BUILD_PATH) -xf $<
-	printf 'CC:=$(CC)\nPKG_CONFIG:=pkg-config\nTC_CONFIG_XT:=n\nTC_CONFIG_ATM:=n\nTC_CONFIG_IPSET:=n\nIP_CONFIG_SETNS:=y\nHAVE_ELF:=n\nHAVE_MNL:=y\nHAVE_BERKELEY_DB:=n\nHAVE_LATEX:=n\nHAVE_PDFLATEX:=n\nCFLAGS+=-DHAVE_SETNS -DHAVE_LIBMNL -I$(LIBMNL_PATH)/include\nLDLIBS+=-lmnl' > $(IPROUTE2_PATH)/config.mk
+	printf 'CC:=$(CC)\nPKG_CONFIG:=pkg-config\nTC_CONFIG_XT:=n\nTC_CONFIG_ATM:=n\nTC_CONFIG_IPSET:=n\nIP_CONFIG_SETNS:=y\nHAVE_ELF:=n\nHAVE_MNL:=n\nHAVE_BERKELEY_DB:=n\nHAVE_LATEX:=n\nHAVE_PDFLATEX:=n\nCFLAGS+=-DHAVE_SETNS\n' > $(IPROUTE2_PATH)/config.mk
 	printf 'lib: snapshot\n\t$$(MAKE) -C lib\nip/ip: lib\n\t$$(MAKE) -C ip ip\nmisc/ss: lib\n\t$$(MAKE) -C misc ss\n' >> $(IPROUTE2_PATH)/Makefile
 	touch $@
 
-$(IPROUTE2_PATH)/ip/ip: | $(IPROUTE2_PATH)/.installed $(LIBMNL_PATH)/src/.libs/libmnl.a $(USERSPACE_DEPS)
-	LDFLAGS="$(LDFLAGS) -L$(LIBMNL_PATH)/src/.libs" PKG_CONFIG_LIBDIR="$(LIBMNL_PATH)" $(MAKE) -C $(IPROUTE2_PATH) PREFIX=/ ip/ip
-	$(STRIP) -s $(IPROUTE2_PATH)/ip/ip
+$(IPROUTE2_PATH)/ip/ip: | $(IPROUTE2_PATH)/.installed $(USERSPACE_DEPS)
+	$(MAKE) -C $(IPROUTE2_PATH) PREFIX=/ ip/ip
+	$(STRIP) -s $@
 
-$(IPROUTE2_PATH)/misc/ss: | $(IPROUTE2_PATH)/.installed $(LIBMNL_PATH)/src/.libs/libmnl.a $(USERSPACE_DEPS)
-	LDFLAGS="$(LDFLAGS) -L$(LIBMNL_PATH)/src/.libs" PKG_CONFIG_LIBDIR="$(LIBMNL_PATH)" $(MAKE) -C $(IPROUTE2_PATH) PREFIX=/ misc/ss
-	$(STRIP) -s $(IPROUTE2_PATH)/misc/ss
+$(IPROUTE2_PATH)/misc/ss: | $(IPROUTE2_PATH)/.installed $(USERSPACE_DEPS)
+	$(MAKE) -C $(IPROUTE2_PATH) PREFIX=/ misc/ss
+	$(STRIP) -s $@
 
 $(IPTABLES_PATH)/.installed: $(IPTABLES_TAR)
 	mkdir -p $(BUILD_PATH)
@@ -358,8 +348,8 @@ $(IPTABLES_PATH)/.installed: $(IPTABLES_TAR)
 	sed -i -e "/nfnetlink=[01]/s:=[01]:=0:" -e "/nfconntrack=[01]/s:=[01]:=0:" $(IPTABLES_PATH)/configure
 	touch $@
 
-$(IPTABLES_PATH)/iptables/xtables-legacy-multi: | $(IPTABLES_PATH)/.installed $(LIBMNL_PATH)/src/.libs/libmnl.a $(USERSPACE_DEPS)
-	cd $(IPTABLES_PATH) && PKG_CONFIG_LIBDIR="$(LIBMNL_PATH)" ./configure --prefix=/ $(CROSS_COMPILE_FLAG) --enable-static --disable-shared --disable-nftables --disable-bpf-compiler --disable-nfsynproxy --disable-libipq --with-kernel=$(BUILD_PATH)/include
+$(IPTABLES_PATH)/iptables/xtables-legacy-multi: | $(IPTABLES_PATH)/.installed $(USERSPACE_DEPS)
+	cd $(IPTABLES_PATH) && ./configure --prefix=/ $(CROSS_COMPILE_FLAG) --enable-static --disable-shared --disable-nftables --disable-bpf-compiler --disable-nfsynproxy --disable-libipq --disable-connlabel --with-kernel=$(BUILD_PATH)/include
 	$(MAKE) -C $(IPTABLES_PATH)
 	$(STRIP) -s $@
 
-- 
2.25.0


^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH net 2/3] wireguard: receive: reset last_under_load to zero
  2020-02-14 13:34 [PATCH net 0/3] wireguard fixes for 5.6-rc2 Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 1/3] wireguard: selftests: reduce complexity and fix make races Jason A. Donenfeld
@ 2020-02-14 13:34 ` Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 3/3] wireguard: send: account for mtu=0 devices Jason A. Donenfeld
  2 siblings, 0 replies; 6+ messages in thread
From: Jason A. Donenfeld @ 2020-02-14 13:34 UTC (permalink / raw)
  To: davem, netdev; +Cc: Jason A. Donenfeld, Matt Dunwoodie

This is a small optimization that prevents more expensive comparisons
from happening when they are no longer necessary, by clearing the
last_under_load variable whenever we wind up in a state where we were
under load but we no longer are.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Suggested-by: Matt Dunwoodie <ncon@noconroy.net>
---
 drivers/net/wireguard/receive.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/receive.c b/drivers/net/wireguard/receive.c
index 9c6bab9c981f..4a153894cee2 100644
--- a/drivers/net/wireguard/receive.c
+++ b/drivers/net/wireguard/receive.c
@@ -118,10 +118,13 @@ static void wg_receive_handshake_packet(struct wg_device *wg,
 
 	under_load = skb_queue_len(&wg->incoming_handshakes) >=
 		     MAX_QUEUED_INCOMING_HANDSHAKES / 8;
-	if (under_load)
+	if (under_load) {
 		last_under_load = ktime_get_coarse_boottime_ns();
-	else if (last_under_load)
+	} else if (last_under_load) {
 		under_load = !wg_birthdate_has_expired(last_under_load, 1);
+		if (!under_load)
+			last_under_load = 0;
+	}
 	mac_state = wg_cookie_validate_packet(&wg->cookie_checker, skb,
 					      under_load);
 	if ((under_load && mac_state == VALID_MAC_WITH_COOKIE) ||
-- 
2.25.0


^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH net 3/3] wireguard: send: account for mtu=0 devices
  2020-02-14 13:34 [PATCH net 0/3] wireguard fixes for 5.6-rc2 Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 1/3] wireguard: selftests: reduce complexity and fix make races Jason A. Donenfeld
  2020-02-14 13:34 ` [PATCH net 2/3] wireguard: receive: reset last_under_load to zero Jason A. Donenfeld
@ 2020-02-14 13:34 ` Jason A. Donenfeld
  2020-02-14 15:18   ` Eric Dumazet
  2 siblings, 1 reply; 6+ messages in thread
From: Jason A. Donenfeld @ 2020-02-14 13:34 UTC (permalink / raw)
  To: davem, netdev; +Cc: Jason A. Donenfeld

It turns out there's an easy way to get packets queued up while still
having an MTU of zero, and that's via persistent keep alive. This commit
makes sure that in whatever condition, we don't wind up dividing by
zero. Note that an MTU of zero for a wireguard interface is something
quasi-valid, so I don't think the correct fix is to limit it via
min_mtu. This can be reproduced easily with:

ip link add wg0 type wireguard
ip link add wg1 type wireguard
ip link set wg0 up mtu 0
ip link set wg1 up
wg set wg0 private-key <(wg genkey)
wg set wg1 listen-port 1 private-key <(wg genkey) peer $(wg show wg0 public-key)
wg set wg0 peer $(wg show wg1 public-key) persistent-keepalive 1 endpoint 127.0.0.1:1

However, while min_mtu=0 seems fine, it makes sense to restrict the
max_mtu. This commit also restricts the maximum MTU to the greatest
number for which rounding up to the padding multiple won't overflow a
signed integer. Packets this large were always rejected anyway
eventually, due to checks deeper in, but it seems more sound not to even
let the administrator configure something that won't work anyway.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 drivers/net/wireguard/device.c | 7 ++++---
 drivers/net/wireguard/send.c   | 3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireguard/device.c b/drivers/net/wireguard/device.c
index 43db442b1373..cdc96968b0f4 100644
--- a/drivers/net/wireguard/device.c
+++ b/drivers/net/wireguard/device.c
@@ -258,6 +258,8 @@ static void wg_setup(struct net_device *dev)
 	enum { WG_NETDEV_FEATURES = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
 				    NETIF_F_SG | NETIF_F_GSO |
 				    NETIF_F_GSO_SOFTWARE | NETIF_F_HIGHDMA };
+	const int overhead = MESSAGE_MINIMUM_LENGTH + sizeof(struct udphdr) +
+			     max(sizeof(struct ipv6hdr), sizeof(struct iphdr));
 
 	dev->netdev_ops = &netdev_ops;
 	dev->hard_header_len = 0;
@@ -271,9 +273,8 @@ static void wg_setup(struct net_device *dev)
 	dev->features |= WG_NETDEV_FEATURES;
 	dev->hw_features |= WG_NETDEV_FEATURES;
 	dev->hw_enc_features |= WG_NETDEV_FEATURES;
-	dev->mtu = ETH_DATA_LEN - MESSAGE_MINIMUM_LENGTH -
-		   sizeof(struct udphdr) -
-		   max(sizeof(struct ipv6hdr), sizeof(struct iphdr));
+	dev->mtu = ETH_DATA_LEN - overhead;
+	dev->max_mtu = round_down(INT_MAX, MESSAGE_PADDING_MULTIPLE) - overhead;
 
 	SET_NETDEV_DEVTYPE(dev, &device_type);
 
diff --git a/drivers/net/wireguard/send.c b/drivers/net/wireguard/send.c
index c13260563446..ae77474dadeb 100644
--- a/drivers/net/wireguard/send.c
+++ b/drivers/net/wireguard/send.c
@@ -148,7 +148,8 @@ static unsigned int calculate_skb_padding(struct sk_buff *skb)
 	 * wouldn't want the final subtraction to overflow in the case of the
 	 * padded_size being clamped.
 	 */
-	unsigned int last_unit = skb->len % PACKET_CB(skb)->mtu;
+	unsigned int last_unit = PACKET_CB(skb)->mtu ?
+				 skb->len % PACKET_CB(skb)->mtu : skb->len;
 	unsigned int padded_size = ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE);
 
 	if (padded_size > PACKET_CB(skb)->mtu)
-- 
2.25.0


^ permalink raw reply related	[flat|nested] 6+ messages in thread
* Re: [PATCH net 3/3] wireguard: send: account for mtu=0 devices
  2020-02-14 13:34 ` [PATCH net 3/3] wireguard: send: account for mtu=0 devices Jason A. Donenfeld
@ 2020-02-14 15:18   ` Eric Dumazet
  2020-02-14 15:56     ` Jason A. Donenfeld
  0 siblings, 1 reply; 6+ messages in thread
From: Eric Dumazet @ 2020-02-14 15:18 UTC (permalink / raw)
  To: Jason A. Donenfeld, davem, netdev



On 2/14/20 5:34 AM, Jason A. Donenfeld wrote:
> It turns out there's an easy way to get packets queued up while still
> having an MTU of zero, and that's via persistent keep alive. This commit
> makes sure that in whatever condition, we don't wind up dividing by
> zero. Note that an MTU of zero for a wireguard interface is something
> quasi-valid, so I don't think the correct fix is to limit it via
> min_mtu. This can be reproduced easily with:
> 
> ip link add wg0 type wireguard
> ip link add wg1 type wireguard
> ip link set wg0 up mtu 0
> ip link set wg1 up
> wg set wg0 private-key <(wg genkey)
> wg set wg1 listen-port 1 private-key <(wg genkey) peer $(wg show wg0 public-key)
> wg set wg0 peer $(wg show wg1 public-key) persistent-keepalive 1 endpoint 127.0.0.1:1
> 
> However, while min_mtu=0 seems fine, it makes sense to restrict the
> max_mtu. This commit also restricts the maximum MTU to the greatest
> number for which rounding up to the padding multiple won't overflow a
> signed integer. Packets this large were always rejected anyway
> eventually, due to checks deeper in, but it seems more sound not to even
> let the administrator configure something that won't work anyway.
> 

If mtu is set to 0, the device must not send any payload.

>  
> diff --git a/drivers/net/wireguard/send.c b/drivers/net/wireguard/send.c
> index c13260563446..ae77474dadeb 100644
> --- a/drivers/net/wireguard/send.c
> +++ b/drivers/net/wireguard/send.c
> @@ -148,7 +148,8 @@ static unsigned int calculate_skb_padding(struct sk_buff *skb)
>  	 * wouldn't want the final subtraction to overflow in the case of the
>  	 * padded_size being clamped.
>  	 */
> -	unsigned int last_unit = skb->len % PACKET_CB(skb)->mtu;
> +	unsigned int last_unit = PACKET_CB(skb)->mtu ?
> +				 skb->len % PACKET_CB(skb)->mtu : skb->len;
>  	unsigned int padded_size = ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE);
>  
>  	if (padded_size > PACKET_CB(skb)->mtu)
> 

Are you sure this works ?

Last statement :

return padded_size - last_unit;

will return a a ' negative number' 


^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH net 3/3] wireguard: send: account for mtu=0 devices
  2020-02-14 15:18   ` Eric Dumazet
@ 2020-02-14 15:56     ` Jason A. Donenfeld
  0 siblings, 0 replies; 6+ messages in thread
From: Jason A. Donenfeld @ 2020-02-14 15:56 UTC (permalink / raw)
  To: Eric Dumazet; +Cc: David Miller, Netdev

On Fri, Feb 14, 2020 at 4:18 PM Eric Dumazet <eric.dumazet@gmail.com> wrote:
> > However, while min_mtu=0 seems fine, it makes sense to restrict the
> > max_mtu. This commit also restricts the maximum MTU to the greatest
> > number for which rounding up to the padding multiple won't overflow a
> > signed integer. Packets this large were always rejected anyway
> > eventually, due to checks deeper in, but it seems more sound not to even
> > let the administrator configure something that won't work anyway.
> >
> If mtu is set to 0, the device must not send any payload.

Yes, but there's still internal keepalive messages.

>
> Are you sure this works ?
>
> Last statement :
>
> return padded_size - last_unit;
>
> will return a a ' negative number'

Woah nelly I don't know how I missed this. Thanks! Will send a v2 of
this patchset.

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-02-14 18:00 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-02-14 13:34 [PATCH net 0/3] wireguard fixes for 5.6-rc2 Jason A. Donenfeld
2020-02-14 13:34 ` [PATCH net 1/3] wireguard: selftests: reduce complexity and fix make races Jason A. Donenfeld
2020-02-14 13:34 ` [PATCH net 2/3] wireguard: receive: reset last_under_load to zero Jason A. Donenfeld
2020-02-14 13:34 ` [PATCH net 3/3] wireguard: send: account for mtu=0 devices Jason A. Donenfeld
2020-02-14 15:18   ` Eric Dumazet
2020-02-14 15:56     ` Jason A. Donenfeld

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