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Jakub Kicinski 6fc2f3832d ipv6: gro: flush instead of assuming different flows on hop_limit mismatch 
IPv6 GRO considers packets to belong to different flows when their
hop_limit is different. This seems counter-intuitive, the flow is
the same. hop_limit may vary because of various bugs or hacks but
that doesn't mean it's okay for GRO to reorder packets.

Practical impact of this problem on overall TCP performance
is unclear, but TCP itself detects this reordering and bumps
TCPSACKReorder resulting in user complaints.

Eric warns that there may be performance regressions in setups
which do packet spraying across links with similar RTT but different
hop count. To be safe let's target -next and not treat this
as a fix. If the packet spraying is using flow label there should
be no difference in behavior as flow label is checked first.

Note that the code plays an easy to miss trick by upcasting next_hdr
to a u16 pointer and compares next_hdr and hop_limit in one go.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-01-25 13:05:11 +00:00
..
6lowpan
9p virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes 2022-01-18 10:05:48 +02:00
802
8021q
appletalk
atm
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-09 17:00:17 -08:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
bluetooth Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2022-01-17 05:49:30 +02:00
bpf bpf: Fix flexible_array.cocci warnings 2022-01-24 17:11:39 +01:00
bpfilter
bridge net: bridge: fix net device refcount tracking issue in error path 2022-01-12 14:44:18 +00:00
caif Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-31 14:35:40 +00:00
can can: isotp: convert struct tpcon::{idx,len} to unsigned int 2022-01-05 21:49:47 +01:00
ceph mm: allow !GFP_KERNEL allocations for kvmalloc 2022-01-15 16:30:29 +02:00
core Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
dcb
dccp tcp/dccp: get rid of inet_twsk_purge() 2022-01-25 11:25:21 +00:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-31 14:35:40 +00:00
dns_resolver
dsa net: dsa: Avoid cross-chip syncing of VLAN filtering 2022-01-25 11:45:39 +00:00
ethernet
ethtool ethtool: use phydev variable 2022-01-06 12:33:35 +00:00
hsr
ieee802154
ife
ipv4 ipv4/tcp: do not use per netns ctl sockets 2022-01-25 11:25:21 +00:00
ipv6 ipv6: gro: flush instead of assuming different flows on hop_limit mismatch 2022-01-25 13:05:11 +00:00
iucv net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
kcm net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
key
l2tp
l3mdev
lapb
llc
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
mac802154
mctp mctp: test: zero out sockaddr 2022-01-11 20:26:36 -08:00
mpls
mptcp mptcp: Use struct_group() to avoid cross-field memset() 2022-01-21 19:26:03 -08:00
ncsi net/ncsi: check for error return from call to nla_put_u32 2021-12-29 17:53:24 -08:00
netfilter Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
netlabel
netlink net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
netrom netrom: fix api breakage in nr_setsockopt() 2022-01-07 14:11:05 +00:00
nfc Networking fixes for 5.17-rc1, including fixes from netfilter, bpf. 2022-01-20 10:57:05 +02:00
nsh
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-09 17:00:17 -08:00
packet net: fix information leakage in /proc/net/ptype 2022-01-20 10:12:53 +00:00
phonet phonet/pep: refuse to enable an unbound pipe 2021-12-20 11:49:51 +00:00
psample
qrtr bus: mhi: core: Add an API for auto queueing buffers for DL channel 2021-12-17 17:17:14 +01:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-12-16 16:13:19 -08:00
rfkill rfkill: allow to get the software rfkill state 2021-12-20 11:02:38 +01:00
rose net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
rxrpc rxrpc: Adjust retransmission backoff 2022-01-22 02:03:24 +00:00
sched net: sched: Clarify error message when qdisc kind is unknown 2022-01-20 11:25:57 +00:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
smc net/smc: Transitional solution for clcsock race issue 2022-01-24 12:06:08 +00:00
strparser
sunrpc Highlights: 2022-01-16 07:42:58 +02:00
switchdev
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
tls net/tls: Fix another skb memory leak when running kTLS traffic 2022-01-17 13:07:47 +00:00
unix Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-01-24 15:42:29 -08:00
vmw_vsock virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes 2022-01-18 10:05:48 +02:00
wireless Kbuild updates for v5.17 2022-01-19 11:15:19 +02:00
x25
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-01-05 14:36:10 -08:00
xfrm xfrm: Don't accidentally set RTO_ONLINK in decode_session4() 2022-01-11 20:36:08 -08:00
compat.c
devres.c
Kconfig
Kconfig.debug
Makefile
socket.c net: fix SOF_TIMESTAMPING_BIND_PHC to work with multiple sockets 2022-01-06 12:18:08 +00:00
sysctl_net.c