net-test: packetdrill: add support of tcp option wildcard "wscale *" #75
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Summary:
In current script, we can either specify every tcp option of a packet,
or use <...> for "any tcp options". This is not flexible enough, as
some script may have requirements for some tcp options; while be
flexible
with other options.
This patch tries to address this by adding wildcard for option wscale.
Specifically, "wscale *" in the tcp option list means any wscale value.
To mark a tcp option in the script as wildcard, we leverage the highest
bit of tcp_option->kind, as TCPOPT_WILDCARD (0x80). tcp_option->kind of
TCPOPT_WILDCARD | TCPOPT_WINDOW (0x83) means wscale option of any value.
verify_outbound_live_tcp_options() is updated to be able to understand
TCPOPT_WILDCARD when set on the script packet and with TCPOPT_WINDOW.
Testing:
Using a script that currently fail on my environment with wscale:
```
$ sudo ./packetdrill/run_all.py -S -v -L -l
tcp/zerocopy/fastopen-client.pkt
FAIL
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client.pkt
(ipv4)]
stdout:
stderr:
fastopen-client.pkt:17: error handling packet: bad value outbound TCP
option 3
script packet: 0.000105 S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr
0,nop,wscale 8,FO,nop,nop>
actual packet: 0.000095 S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1000
ecr 0,nop,wscale 9,FO,nop,nop>
FAIL
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client.pkt
(ipv6)]
stdout:
stderr:
fastopen-client.pkt:17: error handling packet: bad value outbound TCP
option 3
script packet: 0.000157 S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr
0,nop,wscale 8,FO,nop,nop>
actual packet: 0.000145 S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1000
ecr 0,nop,wscale 9,FO,nop,nop>
FAIL
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client.pkt
(ipv4-mapped-v6)]
stdout:
stderr:
fastopen-client.pkt:17: error handling packet: bad value outbound TCP
option 3
script packet: 0.000118 S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr
0,nop,wscale 8,FO,nop,nop>
actual packet: 0.000106 S 0:0(0) win 65535 <mss 1460,sackOK,TS val 1000
ecr 0,nop,wscale 9,FO,nop,nop>
Ran 3 tests: 0 passing, 3 failing, 0 timed out (2.69 sec):
tcp/zerocopy/fastopen-client.pkt
```
Changed the wscale to wildcard:
```
$ diff -ruN tcp/zerocopy/fastopen-client.pkt
tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
--- tcp/zerocopy/fastopen-client.pkt 2023-06-27 18:36:22.956369457
-0700
+++ tcp/zerocopy/fastopen-client-wscale-wildcard.pkt 2023-06-27
18:37:29.306312093 -0700
@@ -14,7 +14,7 @@
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
+0 sendto(3, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = -1
EINPROGRESS (Operation now in progress)
- +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale
8,FO,nop,nop>
+ +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale
*,FO,nop,nop>
+.01 < S. 123:123(0) ack 1 win 14600 <mss 940,TS val 2000 ecr
1000,sackOK,nop,wscale 6, FO abcd1234,nop,nop>
+0 > . 1:1(0) ack 1 <nop,nop,TS val 1001 ecr 2000>
@@ -35,7 +35,7 @@
+0 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 setsockopt(5, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
+0 sendto(5, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = 500
- +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO
abcd1234,nop,nop>
+ +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale *,FO
abcd1234,nop,nop>
+.05 < S. 5678:5678(0) ack 501 win 14600 <mss
1460,nop,nop,sackOK,nop,wscale 6>
+0 > . 501:501(0) ack 1
```
and confirmed the test now pass:
```
$ sudo ./packetdrill/run_all.py -S -v -L -l
tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
(ipv4)]
stdout:
stderr:
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
(ipv6)]
stdout:
stderr:
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
(ipv4-mapped-v6)]
stdout:
stderr:
Ran 3 tests: 3 passing, 0 failing, 0 timed out (7.91 sec):
tcp/zerocopy/fastopen-client-wscale-wildcard.pkt
```
and also still work properly when the wscale is matching expectations:
```
$ diff -ruN tcp/zerocopy/fastopen-client.pkt tcp/zerocopy/fastopen-client-correct-wscale.pkt
--- tcp/zerocopy/fastopen-client.pkt 2023-06-27 18:36:22.956369457
-0700
+++ tcp/zerocopy/fastopen-client-correct-wscale.pkt 2023-06-27
18:39:24.630212385 -0700
@@ -14,7 +14,7 @@
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
+0 sendto(3, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = -1
EINPROGRESS (Operation now in progress)
- +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale
8,FO,nop,nop>
+ +0 > S 0:0(0) <mss 1460,sackOK,TS val 1000 ecr 0,nop,wscale
9,FO,nop,nop>
+.01 < S. 123:123(0) ack 1 win 14600 <mss 940,TS val 2000 ecr
1000,sackOK,nop,wscale 6, FO abcd1234,nop,nop>
+0 > . 1:1(0) ack 1 <nop,nop,TS val 1001 ecr 2000>
@@ -35,7 +35,7 @@
+0 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 setsockopt(5, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
+0 sendto(5, ..., 500, MSG_FASTOPEN|MSG_ZEROCOPY, ..., ...) = 500
- +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale 8,FO
abcd1234,nop,nop>
+ +0 > S 0:500(500) <mss 1460,nop,nop,sackOK,nop,wscale 9,FO
abcd1234,nop,nop>
+.05 < S. 5678:5678(0) ack 501 win 14600 <mss
1460,nop,nop,sackOK,nop,wscale 6>
+0 > . 501:501(0) ack 1
```
with
```
$ sudo ./packetdrill/run_all.py -S -v -L -l tcp/zerocopy/fastopen-client-correct-wscale.pkt
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-correct-wscale.pkt
(ipv4)]
stdout:
stderr:
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-correct-wscale.pkt
(ipv6)]
stdout:
stderr:
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/zerocopy/fastopen-client-correct-wscale.pkt
(ipv4-mapped-v6)]
stdout:
stderr:
Ran 3 tests: 3 passing, 0 failing, 0 timed out (8.16 sec):
tcp/zerocopy/fastopen-client-correct-wscale.pkt
```
Also comfirmed that wscale wildcard would not cause and option which has
0x80 set to pass.
For instance with:
```
$ diff -ruN tcp/fastopen/server/simple2.pkt
tcp/fastopen/server/simple2-wscale.pkt
--- tcp/fastopen/server/simple2.pkt 2023-06-27 17:28:58.547790456
-0700
+++ tcp/fastopen/server/simple2-wscale.pkt 2023-06-27
19:00:49.460036441 -0700
@@ -22,7 +22,7 @@
+0 < S 9873242:9873242(0) win 10000 <mss 1012,FOEXP,sackOK,TS val 1
ecr 0,nop,wscale 7>
// Test the cookie is as expected by encoding both IPs w/ key
- +0 > S. 0:0(0) ack 9873243 <mss 1460,sackOK,TS val 10000 ecr
1,nop,wscale 8, FOEXP 1313a2da994a0951>
+ +0 > S. 0:0(0) ack 9873243 <mss 1460,sackOK,TS val 10000 ecr
1,nop,wscale *, FOEXP f49b0ef989d9f624>
+.1 < . 1:1(0) ack 1 win 257 <nop,nop,TS val 2 ecr 10000>
+0 accept(3, ..., ...) = 4
+0 close(4) = 0
@@ -38,8 +38,8 @@
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
- +.05 < S 19124022:19125022(1000) win 10000 <mss 1012,FOEXP
1313a2da994a0951,sackOK,TS val 10 ecr 0,nop,wscale 7>
- +0 > S. 0:0(0) ack 19125023 <mss 1460,sackOK,TS val 100000 ecr
10,nop,wscale 8>
+ +.05 < S 19124022:19125022(1000) win 10000 <mss 1012,FOEXP
f49b0ef989d9f624,sackOK,TS val 10 ecr 0,nop,wscale 7>
+ +0 > S. 0:0(0) ack 19125023 <mss 1460,sackOK,TS val 100000 ecr
10,nop,wscale 9>
+0 accept(3, ..., ...) = 4
`/tmp/sysctl_restore_${PPID}.sh`
```
The test fails at handling Fast Open Experimental
```
simple2-wscale.pkt:25: error handling packet: bad value outbound TCP
option 254
script packet: 0.000163 S. 0:0(0) ack 9873243 <mss 1460,sackOK,TS val
10000 ecr 1,nop,wscale *,FOEXP f49b0ef989d9f624>
actual packet: 0.000159 S. 0:0(0) ack 9873243 win 65535 <mss
1460,sackOK,TS val 10000 ecr 1,nop,wscale 9,FOEXP 792f542eed8979b8>
OK
[/data/users/chantra/google-packetdrill/gtests/net/tcp/fastopen/server/simple2-wscale.pkt
(ipv4-mapped-v6)]
```
Signed-off-by: Manu Bretelle <chantra@meta.com>
Author
|
@nealcardwell I forced pushed the change with my corp email address. CLA bot is now happy. |
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Summary:
In current script, we can either specify every tcp option of a packet, or use <...> for "any tcp options". This is not flexible enough, as some script may have requirements for some tcp options; while be flexible
with other options.
This patch tries to address this by adding wildcard for option wscale. Specifically, "wscale *" in the tcp option list means any wscale value.
To mark a tcp option in the script as wildcard, we leverage the highest bit of tcp_option->kind, as TCPOPT_WILDCARD (0x80). tcp_option->kind of TCPOPT_WILDCARD | TCPOPT_WINDOW (0x83) means wscale option of any value.
verify_outbound_live_tcp_options() is updated to be able to understand TCPOPT_WILDCARD when set on the script packet and with TCPOPT_WINDOW.
Testing:
Using a script that currently fail on my environment with wscale:
Changed the wscale to wildcard:
and confirmed the test now pass:
and also still work properly when the wscale is matching expectations:
with
Also comfirmed that wscale wildcard would not cause and option which has 0x80 set to pass.
For instance with:
The test fails at handling Fast Open Experimental