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Tong Zhu 8a059acbdb neighbour: Disregard DEAD dst in neigh_update 
[ Upstream commit d47ec7a0a7271dda08932d6208e4ab65ab0c987c ]

After a short network outage, the dst_entry is timed out and put
in DST_OBSOLETE_DEAD. We are in this code because arp reply comes
from this neighbour after network recovers. There is a potential
race condition that dst_entry is still in DST_OBSOLETE_DEAD.
With that, another neighbour lookup causes more harm than good.

In best case all packets in arp_queue are lost. This is
counterproductive to the original goal of finding a better path
for those packets.

I observed a worst case with 4.x kernel where a dst_entry in
DST_OBSOLETE_DEAD state is associated with loopback net_device.
It leads to an ethernet header with all zero addresses.
A packet with all zero source MAC address is quite deadly with
mac80211, ath9k and 802.11 block ack.  It fails
ieee80211_find_sta_by_ifaddr in ath9k (xmit.c). Ath9k flushes tx
queue (ath_tx_complete_aggr). BAW (block ack window) is not
updated. BAW logic is damaged and ath9k transmission is disabled.

Signed-off-by: Tong Zhu <zhutong@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-05-20 16:07:08 +08:00
Documentation dt-bindings: net: ethernet-controller: fix typo in NVMEM 2021-05-20 16:07:03 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch arc: kernel: Return -EFAULT if copy_to_user() fails 2021-05-20 16:07:08 +08:00
block block: only update parent bi_status when bio fail 2021-05-20 16:07:05 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: x86 - Regularize glue function prototypes 2021-04-12 12:53:14 +08:00
drivers dmaengine: dw: Make it dependent to HAS_IOMEM 2021-05-20 16:07:08 +08:00
fs block: don't ignore REQ_NOWAIT for direct IO 2021-05-20 16:07:06 +08:00
include net/mlx5: Fix PBMC register mapping 2021-05-20 16:07:03 +08:00
init init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM 2021-05-20 16:06:54 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel lockdep: Add a missing initialization hint to the "INFO: Trying to register non-static key" message 2021-05-20 16:07:08 +08:00
lib PCI: Fix pci_register_io_range() memory leak 2021-04-12 12:53:04 +08:00
mm mm: fix race by making init_zero_pfn() early_initcall 2021-05-20 16:06:49 +08:00
net neighbour: Disregard DEAD dst in neigh_update 2021-05-20 16:07:08 +08:00
package net: open CONFIG_XFRM_OFFLOAD for x86 public 2021-05-18 07:22:15 +00:00
samples samples, bpf: Add missing munmap in xdpsock 2021-04-12 12:52:57 +08:00
scripts ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount 2021-04-12 12:52:52 +08:00
security integrity: double check iint_cache was initialized 2021-04-12 12:53:26 +08:00
sound ASoC: max98373: Added 30ms turn on/off time delay 2021-05-20 16:07:08 +08:00
tools perf map: Tighten snprintf() string precision to pass gcc check on some 32-bit arches 2021-05-20 16:07:06 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: arm64: Ensure I-cache isolation between vcpus of a same VM 2021-04-12 12:53:12 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2021-03-16 16:34:24 +08:00
Makefile Rebase to linux long term 5.4.109 2021-04-12 12:53:32 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0