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![]() This patch fixes a kernel BUG_ON in skb_segment. It is hit when testing two VMs on openvswitch with one VM acting as VXLAN gateway. During VXLAN packet GSO, skb_segment is called with skb->data pointing to inner TCP payload. skb_segment calls skb_network_protocol to retrieve the inner protocol. skb_network_protocol actually expects skb->data to point to MAC and it calls pskb_may_pull with ETH_HLEN. This ends up pulling in ETH_HLEN data from header tail. As a result, pskb_trim logic is skipped and BUG_ON is hit later. Move skb_push in front of skb_network_protocol so that skb->data lines up properly. kernel BUG at net/core/skbuff.c:2999! Call Trace: [<ffffffff816ac412>] tcp_gso_segment+0x122/0x410 [<ffffffff816bc74c>] inet_gso_segment+0x13c/0x390 [<ffffffff8164b39b>] skb_mac_gso_segment+0x9b/0x170 [<ffffffff816b3658>] skb_udp_tunnel_segment+0xd8/0x390 [<ffffffff816b3c00>] udp4_ufo_fragment+0x120/0x140 [<ffffffff816bc74c>] inet_gso_segment+0x13c/0x390 [<ffffffff8109d742>] ? default_wake_function+0x12/0x20 [<ffffffff8164b39b>] skb_mac_gso_segment+0x9b/0x170 [<ffffffff8164b4d0>] __skb_gso_segment+0x60/0xc0 [<ffffffff8164b6b3>] dev_hard_start_xmit+0x183/0x550 [<ffffffff8166c91e>] sch_direct_xmit+0xfe/0x1d0 [<ffffffff8164bc94>] __dev_queue_xmit+0x214/0x4f0 [<ffffffff8164bf90>] dev_queue_xmit+0x10/0x20 [<ffffffff81687edb>] ip_finish_output+0x66b/0x890 [<ffffffff81688a58>] ip_output+0x58/0x90 [<ffffffff816c628f>] ? fib_table_lookup+0x29f/0x350 [<ffffffff816881c9>] ip_local_out_sk+0x39/0x50 [<ffffffff816cbfad>] iptunnel_xmit+0x10d/0x130 [<ffffffffa0212200>] vxlan_xmit_skb+0x1d0/0x330 [vxlan] [<ffffffffa02a3919>] vxlan_tnl_send+0x129/0x1a0 [openvswitch] [<ffffffffa02a2cd6>] ovs_vport_send+0x26/0xa0 [openvswitch] [<ffffffffa029931e>] do_output+0x2e/0x50 [openvswitch] Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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.. | ||
datagram.c | ||
dev.c | ||
dev_addr_lists.c | ||
dev_ioctl.c | ||
drop_monitor.c | ||
dst.c | ||
ethtool.c | ||
fib_rules.c | ||
filter.c | ||
flow.c | ||
flow_dissector.c | ||
gen_estimator.c | ||
gen_stats.c | ||
iovec.c | ||
link_watch.c | ||
Makefile | ||
neighbour.c | ||
net-procfs.c | ||
net-sysfs.c | ||
net-sysfs.h | ||
net-traces.c | ||
net_namespace.c | ||
netclassid_cgroup.c | ||
netevent.c | ||
netpoll.c | ||
netprio_cgroup.c | ||
pktgen.c | ||
ptp_classifier.c | ||
request_sock.c | ||
rtnetlink.c | ||
scm.c | ||
secure_seq.c | ||
skbuff.c | ||
sock.c | ||
sock_diag.c | ||
stream.c | ||
sysctl_net_core.c | ||
timestamping.c | ||
user_dma.c | ||
utils.c |