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OpenCloudOS-Kernel/drivers/net
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Alexander Sverdlin 81f3dc9349 macvlan: Skip loopback packets in RX handler 
Ignore loopback-originatig packets soon enough and don't try to process L2
header where it doesn't exist. The very similar br_handle_frame() in bridge
code performs exactly the same check.

This is an example of such ICMPv6 packet:

skb len=96 headroom=40 headlen=96 tailroom=56
mac=(40,0) net=(40,40) trans=80
shinfo(txflags=0 nr_frags=0 gso(size=0 type=0 segs=0))
csum(0xae2e9a2f ip_summed=1 complete_sw=0 valid=0 level=0)
hash(0xc97ebd88 sw=1 l4=1) proto=0x86dd pkttype=5 iif=24
dev name=etha01.212 feat=0x0x0000000040005000
skb headroom: 00000000: 00 7c 86 52 84 88 ff ff 00 00 00 00 00 00 08 00
skb headroom: 00000010: 45 00 00 9e 5d 5c 40 00 40 11 33 33 00 00 00 01
skb headroom: 00000020: 02 40 43 80 00 00 86 dd
skb linear:   00000000: 60 09 88 bd 00 38 3a ff fe 80 00 00 00 00 00 00
skb linear:   00000010: 00 40 43 ff fe 80 00 00 ff 02 00 00 00 00 00 00
skb linear:   00000020: 00 00 00 00 00 00 00 01 86 00 61 00 40 00 00 2d
skb linear:   00000030: 00 00 00 00 00 00 00 00 03 04 40 e0 00 00 01 2c
skb linear:   00000040: 00 00 00 78 00 00 00 00 fd 5f 42 68 23 87 a8 81
skb linear:   00000050: 00 00 00 00 00 00 00 00 01 01 02 40 43 80 00 00
skb tailroom: 00000000: ...
skb tailroom: 00000010: ...
skb tailroom: 00000020: ...
skb tailroom: 00000030: ...

Call Trace, how it happens exactly:
 ...
 macvlan_handle_frame+0x321/0x425 [macvlan]
 ? macvlan_forward_source+0x110/0x110 [macvlan]
 __netif_receive_skb_core+0x545/0xda0
 ? enqueue_task_fair+0xe5/0x8e0
 ? __netif_receive_skb_one_core+0x36/0x70
 __netif_receive_skb_one_core+0x36/0x70
 process_backlog+0x97/0x140
 net_rx_action+0x1eb/0x350
 ? __hrtimer_run_queues+0x136/0x2e0
 __do_softirq+0xe3/0x383
 do_softirq_own_stack+0x2a/0x40
 </IRQ>
 do_softirq.part.4+0x4e/0x50
 netif_rx_ni+0x60/0xd0
 dev_loopback_xmit+0x83/0xf0
 ip6_finish_output2+0x575/0x590 [ipv6]
 ? ip6_cork_release.isra.1+0x64/0x90 [ipv6]
 ? __ip6_make_skb+0x38d/0x680 [ipv6]
 ? ip6_output+0x6c/0x140 [ipv6]
 ip6_output+0x6c/0x140 [ipv6]
 ip6_send_skb+0x1e/0x60 [ipv6]
 rawv6_sendmsg+0xc4b/0xe10 [ipv6]
 ? proc_put_long+0xd0/0xd0
 ? rw_copy_check_uvector+0x4e/0x110
 ? sock_sendmsg+0x36/0x40
 sock_sendmsg+0x36/0x40
 ___sys_sendmsg+0x2b6/0x2d0
 ? proc_dointvec+0x23/0x30
 ? addrconf_sysctl_forward+0x8d/0x250 [ipv6]
 ? dev_forward_change+0x130/0x130 [ipv6]
 ? _raw_spin_unlock+0x12/0x30
 ? proc_sys_call_handler.isra.14+0x9f/0x110
 ? __call_rcu+0x213/0x510
 ? get_max_files+0x10/0x10
 ? trace_hardirqs_on+0x2c/0xe0
 ? __sys_sendmsg+0x63/0xa0
 __sys_sendmsg+0x63/0xa0
 do_syscall_64+0x6c/0x1e0
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2020-05-26 23:18:11 -07:00
..
appletalk docs: networking: convert ltpc.txt to ReST 2020-04-30 12:56:36 -07:00
arcnet docs: networking: convert arcnet.txt to ReST 2020-04-28 14:38:38 -07:00
bonding Merge branch 'mlx5-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux 2020-05-09 01:05:30 -07:00
caif docs: networking: convert caif files to ReST 2020-04-28 14:38:38 -07:00
can net: Fix return value about devm_platform_ioremap_resource() 2020-05-23 16:28:25 -07:00
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
ethernet mlxsw: spectrum_router: Allow programming link-local prefix routes 2020-05-26 20:33:58 -07:00
fddi docs: networking: convert skfp.txt to ReST 2020-04-30 12:56:38 -07:00
fjes
…
hamradio Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
hippi
…
hyperv xsk: Remove MEM_TYPE_ZERO_COPY and corresponding code 2020-05-21 17:31:27 -07:00
ieee802154
…
ipa drivers: ipa: print dev_err info accurately 2020-05-25 18:03:56 -07:00
ipvlan net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
netdevsim netdevsim: Ensure policer drop counter always increases 2020-05-22 16:05:42 -07:00
phy net: phy: mscc-miim: read poll when high resolution timers are disabled 2020-05-26 15:33:56 -07:00
plip docs: networking: convert PLIP.txt to ReST 2020-04-30 12:56:37 -07:00
ppp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
slip
…
team net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
vmxnet3
…
wan docs: networking: convert framerelay.txt to ReST 2020-04-28 14:39:46 -07:00
wimax
…
wireguard wireguard: noise: separate receive counter from send counter 2020-05-20 20:55:09 -07:00
wireless One batch of changes, containing: 2020-05-26 20:17:35 -07:00
xen-netback
…
Kconfig docs: networking: device drivers: convert sb1000.txt to ReST 2020-05-01 12:24:42 -07:00
LICENSE.SRC
…
Makefile
…
Space.c
…
bareudp.c net: bareudp: avoid uninitialized variable warning 2020-05-07 17:28:18 -07:00
dummy.c
…
eql.c
…
geneve.c
…
gtp.c gtp: set NLM_F_MULTI flag in gtp_genl_dump_pdp() 2020-05-01 15:34:09 -07:00
ifb.c
…
loopback.c
…
macsec.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-06 22:10:13 -07:00
macvlan.c macvlan: Skip loopback packets in RX handler 2020-05-26 23:18:11 -07:00
macvtap.c
…
mdio.c
…
mii.c
…
net_failover.c
…
netconsole.c
…
nlmon.c
…
ntb_netdev.c
…
rionet.c rionet: Fix use correct return type for ndo_start_xmit() 2020-04-30 12:15:13 -07:00
sb1000.c
…
sungem_phy.c
…
tap.c
…
thunderbolt.c
…
tun.c tun: Add XDP frame size 2020-05-14 21:21:55 -07:00
veth.c veth: Xdp using frame_sz in veth driver 2020-05-14 21:21:54 -07:00
virtio_net.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
vrf.c net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
vsockmon.c
…
vxlan.c vxlan: Do not assume RTNL is held in vxlan_fdb_info() 2020-05-24 19:34:11 -07:00
xen-netfront.c
…