Merge branch 'net-packet-KCSAN'

Eric Dumazet says:

====================
net/packet: KCSAN awareness

This series is based on one syzbot report [1]

Seven 'flags/booleans' are converted to atomic bit variant.

po->xmit and po->tp_tstamp accesses get annotations.

[1]
BUG: KCSAN: data-race in packet_rcv / packet_setsockopt

read-write to 0xffff88813dbe84e4 of 1 bytes by task 12312 on cpu 0:
packet_setsockopt+0xb77/0xe60 net/packet/af_packet.c:3900
__sys_setsockopt+0x212/0x2b0 net/socket.c:2252
__do_sys_setsockopt net/socket.c:2263 [inline]
__se_sys_setsockopt net/socket.c:2260 [inline]
__x64_sys_setsockopt+0x62/0x70 net/socket.c:2260
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813dbe84e4 of 1 bytes by task 1911 on cpu 1:
packet_rcv+0x4b1/0xa40 net/packet/af_packet.c:2187
deliver_skb net/core/dev.c:2189 [inline]
dev_queue_xmit_nit+0x3a9/0x620 net/core/dev.c:2259
xmit_one+0x71/0x2a0 net/core/dev.c:3586
dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3606
__dev_queue_xmit+0x91c/0x11c0 net/core/dev.c:4256
dev_queue_xmit include/linux/netdevice.h:3008 [inline]
neigh_hh_output include/net/neighbour.h:530 [inline]
neigh_output include/net/neighbour.h:544 [inline]
ip6_finish_output2+0x9e9/0xc30 net/ipv6/ip6_output.c:134
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x395/0x4f0 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:291 [inline]
ip6_output+0x10e/0x210 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:445 [inline]
ip6_local_out+0x60/0x80 net/ipv6/output_core.c:161
ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline]
udp_tunnel6_xmit_skb+0x321/0x4a0 net/ipv6/ip6_udp_tunnel.c:109
send6+0x2ed/0x3b0 drivers/net/wireguard/socket.c:152
wg_socket_send_skb_to_peer+0xbb/0x120 drivers/net/wireguard/socket.c:178
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x142/0x360 drivers/net/wireguard/send.c:276
process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
worker_thread+0x618/0xa70 kernel/workqueue.c:2436
kthread+0x1a9/0x1e0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
====================

Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>