sync with latest net-next bpf headers

[yonghong-song]

Sync compat bpf.h and virtual_bpf.h with latest net-next versions

Signed-off-by: Yonghong Song [email protected]

[yonghong-song]

@drzaeus77 the test failure seems related to test infra. Could you take a look?

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

The failure on ubuntu 16.04 is legitimate.

15: 37: (bf) r1 = r6
15: 38: (85) call 12
15: 39: (05) goto pc+23
15: 63: (b7) r0 = 1
15: 64: (95) exit
15: 
15: from 29 to 63: safe
15: 
15: from 21 to 63: R0=imm0 R6=ctx R10=fp
15: 63: (b7) r0 = 1
15: 64: (95) exit
15: 
15: from 2 to 9: R1=inv R6=ctx R10=fp
15: 9: (79) r1 = *(u64 *)(r6 +48)
15: invalid bpf_context access off=48 size=8
15: 

The __sk_buff cb is accessed with size of 8. This is not allowed in 4.4 verifier but
relaxed in later verifier. The thing I do not understand is why the issue is triggered
here by llvm.

[yonghong-song]

Tried on my local ubuntu 16.04 VM and it runs successfully.

yhs@ubuntu:~/work/bcc/tests/python$ uname -a
Linux ubuntu 4.4.0-87-generic #110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
yhs@ubuntu:~/work/bcc/tests/python$ sudo ./test_brb.py test_brb.c
net.ipv4.ip_forward = 1
ARPING 100.1.1.254
Timeout

--- 100.1.1.254 statistics ---
1 packets transmitted, 0 packets received, 100% unanswered (0 extra)

ARPING 200.1.1.254
Timeout

--- 200.1.1.254 statistics ---
1 packets transmitted, 0 packets received, 100% unanswered (0 extra)

PING 200.1.1.1 (200.1.1.1) 56(84) bytes of data.
64 bytes from 200.1.1.1: icmp_seq=1 ttl=63 time=0.084 ms
64 bytes from 200.1.1.1: icmp_seq=2 ttl=63 time=0.053 ms

--- 200.1.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.053/0.068/0.084/0.017 ms
[ ID] Interval       Transfer     Bandwidth
[  7]  0.0- 1.0 sec  5.97 GBytes  51.3 Gbits/sec
[ ID] Interval       Transfer     Bandwidth
[ 10]  0.0- 1.0 sec  5.97 GBytes  50.9 Gbits/sec
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 200.1.1.1 () port 0 AF_INET : demo
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  65160    1.00     53080.34   
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 200.1.1.1 () port 0 AF_INET : demo : first burst 0
Local /Remote
Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate         
bytes  Bytes  bytes    bytes   secs.    per sec   

16384  87380  1        1       1.00     11951.51   
16384  87380 
.
----------------------------------------------------------------------
Ran 1 test in 7.171s

OK
yhs@ubuntu:~/work/bcc/tests/python$ 

The testbot has version 4.4.0-116-generic and mine is 4.4.0-87-generic.
Will run one more time and it still failed then will change test_brb.c code.

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

[buildbot, test this please]

[yonghong-song]

[buildbot, test this please]