Matthias Schiffer 3e59e88567 net: l2tp: reduce log level of messages in receive path, add counter instead ... Commit 5ee759cda5 ("l2tp: use standard API for warning log messages") changed a number of warnings about invalid packets in the receive path so that they are always shown, instead of only when a special L2TP debug flag is set. Even with rate limiting these warnings can easily cause significant log spam - potentially triggered by a malicious party sending invalid packets on purpose. In addition these warnings were noticed by projects like Tunneldigger [1], which uses L2TP for its data path, but implements its own control protocol (which is sufficiently different from L2TP data packets that it would always be passed up to userspace even with future extensions of L2TP). Some of the warnings were already redundant, as l2tp_stats has a counter for these packets. This commit adds one additional counter for invalid packets that are passed up to userspace. Packets with unknown session are not counted as invalid, as there is nothing wrong with the format of these packets. With the additional counter, all of these messages are either redundant or benign, so we reduce them to pr_debug_ratelimited(). [1] https://github.com/wlanslovenija/tunneldigger/issues/160 Fixes: 5ee759cda5 ("l2tp: use standard API for warning log messages") Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: David S. Miller <davem@davemloft.net>		2021-03-03 16:55:02 -08:00
..
acpi	IOMMU Updates for Linux v5.12	2021-02-22 10:31:29 -08:00
asm-generic	- added n64 block driver	2021-02-25 12:18:21 -08:00
clocksource
crypto	Keyrings miscellany	2021-02-23 16:09:23 -08:00
drm	drm/drm_vblank: set the dma-fence timestamp during send_vblank_event	2021-02-24 21:05:54 +05:30
dt-bindings	Char/Misc driver patches for 5.12-rc1	2021-02-24 10:25:37 -08:00
keys
kunit
kvm
linux	net: expand textsearch ts_state to fit skb_seq_state	2021-03-01 15:25:24 -08:00
math-emu
media	Fixes around VM_FPNMAP and follow_pfn	2021-02-22 17:45:02 -08:00
memory
misc
net	net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending	2021-02-23 11:29:52 -08:00
pcmcia
ras
rdma	RDMA/ipoib: Remove racy Subnet Manager sendonly join checks	2021-02-16 14:42:58 -04:00
scsi
soc	IOMMU Updates for Linux v5.12	2021-02-22 10:31:29 -08:00
sound	ASoC: Updates for v5.12	2021-02-17 21:16:27 +01:00
target
trace	mm/swap.c: don't pass "enum lru_list" to trace_mm_lru_insertion()	2021-02-24 13:38:33 -08:00
uapi	net: l2tp: reduce log level of messages in receive path, add counter instead	2021-03-03 16:55:02 -08:00
vdso
video
xen	x86:	2021-02-21 13:31:43 -08:00