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linux/net/openvswitch
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Paul Blakey d9b5ae5c1b openvswitch: Fix setting ipv6 fields causing hw csum failure 
Ipv6 ttl, label and tos fields are modified without first
pulling/pushing the ipv6 header, which would have updated
the hw csum (if available). This might cause csum validation
when sending the packet to the stack, as can be seen in
the trace below.

Fix this by updating skb->csum if available.

Trace resulted by ipv6 ttl dec and then sending packet
to conntrack [actions: set(ipv6(hlimit=63)),ct(zone=99)]:
[295241.900063] s_pf0vf2: hw csum failure
[295241.923191] Call Trace:
[295241.925728]  <IRQ>
[295241.927836]  dump_stack+0x5c/0x80
[295241.931240]  __skb_checksum_complete+0xac/0xc0
[295241.935778]  nf_conntrack_tcp_packet+0x398/0xba0 [nf_conntrack]
[295241.953030]  nf_conntrack_in+0x498/0x5e0 [nf_conntrack]
[295241.958344]  __ovs_ct_lookup+0xac/0x860 [openvswitch]
[295241.968532]  ovs_ct_execute+0x4a7/0x7c0 [openvswitch]
[295241.979167]  do_execute_actions+0x54a/0xaa0 [openvswitch]
[295242.001482]  ovs_execute_actions+0x48/0x100 [openvswitch]
[295242.006966]  ovs_dp_process_packet+0x96/0x1d0 [openvswitch]
[295242.012626]  ovs_vport_receive+0x6c/0xc0 [openvswitch]
[295242.028763]  netdev_frame_hook+0xc0/0x180 [openvswitch]
[295242.034074]  __netif_receive_skb_core+0x2ca/0xcb0
[295242.047498]  netif_receive_skb_internal+0x3e/0xc0
[295242.052291]  napi_gro_receive+0xba/0xe0
[295242.056231]  mlx5e_handle_rx_cqe_mpwrq_rep+0x12b/0x250 [mlx5_core]
[295242.062513]  mlx5e_poll_rx_cq+0xa0f/0xa30 [mlx5_core]
[295242.067669]  mlx5e_napi_poll+0xe1/0x6b0 [mlx5_core]
[295242.077958]  net_rx_action+0x149/0x3b0
[295242.086762]  __do_softirq+0xd7/0x2d6
[295242.090427]  irq_exit+0xf7/0x100
[295242.093748]  do_IRQ+0x7f/0xd0
[295242.096806]  common_interrupt+0xf/0xf
[295242.100559]  </IRQ>
[295242.102750] RIP: 0033:0x7f9022e88cbd
[295242.125246] RSP: 002b:00007f9022282b20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffda
[295242.132900] RAX: 0000000000000005 RBX: 0000000000000010 RCX: 0000000000000000
[295242.140120] RDX: 00007f9022282ba8 RSI: 00007f9022282a30 RDI: 00007f9014005c30
[295242.147337] RBP: 00007f9014014d60 R08: 0000000000000020 R09: 00007f90254a8340
[295242.154557] R10: 00007f9022282a28 R11: 0000000000000246 R12: 0000000000000000
[295242.161775] R13: 00007f902308c000 R14: 000000000000002b R15: 00007f9022b71f40

Fixes: 3fdbd1ce11 ("openvswitch: add ipv6 'set' action")
Signed-off-by: Paul Blakey <paulb@nvidia.com>
Link: https://lore.kernel.org/r/20220223163416.24096-1-paulb@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-02-24 09:16:21 -08:00
..
actions.c openvswitch: Fix setting ipv6 fields causing hw csum failure 2022-02-24 09:16:21 -08:00
conntrack.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2022-01-09 15:59:23 -08:00
conntrack.h net/sched: act_api: fix miss set post_ct for ovs after do conntrack in act_ct 2021-03-16 15:22:18 -07:00
datapath.c openvswitch: fix sparse warning incorrect type 2021-07-27 11:48:43 +01:00
datapath.h openvswitch: Introduce per-cpu upcall dispatch 2021-07-16 11:06:33 -07:00
dp_notify.c
flow_netlink.c net: openvswitch: add log message for error case 2021-01-14 16:32:14 -08:00
flow_netlink.h
flow_table.c openvswitch: Optimize operation for key comparison 2021-07-01 11:13:10 -07:00
flow_table.h net: openvswitch: fix to make sure flow_lookup() is not preempted 2020-10-18 12:29:36 -07:00
flow.c net: openvswitch: Fix ct_state nat flags for conns arriving from tc 2022-01-09 16:24:12 -08:00
flow.h
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile openvswitch: add trace points 2021-06-22 10:47:32 -07:00
meter.c include/linux/mm.h: move nr_free_buffer_pages from swap.h to mm.h 2021-11-06 13:30:43 -07:00
meter.h net: openvswitch: use u64 for meter bucket 2020-04-23 18:26:11 -07:00
openvswitch_trace.c openvswitch: add trace points 2021-06-22 10:47:32 -07:00
openvswitch_trace.h openvswitch: add trace points 2021-06-22 10:47:32 -07:00
vport-geneve.c
vport-gre.c
vport-internal_dev.c net: openvswitch: use core API to update/provide stats 2020-11-14 16:59:32 -08:00
vport-internal_dev.h
vport-netdev.c openvswitch: add net device refcount tracker to struct vport 2021-12-07 20:45:00 -08:00
vport-netdev.h
vport-vxlan.c
vport.c ovs: clear skb->tstamp in forwarding path 2021-08-18 11:31:13 +01:00
vport.h openvswitch: add net device refcount tracker to struct vport 2021-12-07 20:45:00 -08:00