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Merge branch 'wireguard-fixes' 

Jason A. Donenfeld says:

====================
wireguard fixes for 5.6-rc2

Here are four 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.

4) A removal of superfluous code, pointed out by Eric Dumazet.

v2 fixes a logical problem in the patch for (3) pointed out by Eric Dumazet. v3
replaces some non-obvious bitmath in (3) with a more obvious expression, and
adds patch (4).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-02-16 19:21:56 -08:00
parent b6e4a1aeeb 1fbc33b0a7
commit 82d81bb070
5 changed files with 34 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireguard/device.c
View File

@ -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);

7
drivers/net/wireguard/receive.c
View File

@ -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) ||

16
drivers/net/wireguard/send.c
View File

@ -143,16 +143,22 @@ static void keep_key_fresh(struct wg_peer *peer)
static unsigned int calculate_skb_padding(struct sk_buff *skb)
{
unsigned int padded_size, last_unit = skb->len;
if (unlikely(!PACKET_CB(skb)->mtu))
return ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE) - last_unit;
/* We do this modulo business with the MTU, just in case the networking
* layer gives us a packet that's bigger than the MTU. In that case, we
* wouldn't want the final subtraction to overflow in the case of the
* padded_size being clamped.
* padded_size being clamped. Fortunately, that's very rarely the case,
* so we optimize for that not happening.
*/
unsigned int last_unit = skb->len % PACKET_CB(skb)->mtu;
unsigned int padded_size = ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE);
if (unlikely(last_unit > PACKET_CB(skb)->mtu))
last_unit %= PACKET_CB(skb)->mtu;
if (padded_size > PACKET_CB(skb)->mtu)
padded_size = PACKET_CB(skb)->mtu;
padded_size = min(PACKET_CB(skb)->mtu,
ALIGN(last_unit, MESSAGE_PADDING_MULTIPLE));
return padded_size - last_unit;
}

1
drivers/net/wireguard/socket.c
View File

@ -432,7 +432,6 @@ void wg_socket_reinit(struct wg_device *wg, struct sock *new4,
wg->incoming_port = ntohs(inet_sk(new4)->inet_sport);
mutex_unlock(&wg->socket_update_lock);
synchronize_rcu();
synchronize_net();
sock_free(old4);
sock_free(old6);
}

38
tools/testing/selftests/wireguard/qemu/Makefile
View File

@ -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 $@