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In the previous article #003 "Are you P4 compliant ?" we exposed a setup where RARE/freeRouter was controlling BMv2 P4 dataplane called simple_switch_grpc. In this article we replace the open source BMv2 target by a commercial virtual target provided by INTEL/BAREFOOT. As a side note, we will show that this setup can be integrated with real networks. (with inherent software limitations)

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I'm repeating the core message from #003: For those who are not familiar with data plane programming and especially with P4, "P4 is a domain-specific programming language for specifying the behaviour of the dataplanes of network-forwarding elements." (from p4.org) in short it helps you to write a "program specifying how a switch processes packets".

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In this article we'll using freeRouter setup deployed in #003 and replace bmv2/simple_switch_grpc providing freeRouter P4Lang's dataplane by INTEL BAREFOOT/bf_switchd. Actually the effective dataplane is ensured by INTEL/BAREFOOT virtual bf_switchd model running RARE P4 program called: bf_router.p4.

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Expand

title	Create configuration files for router: freerouter

FreeRouter uses 2 configuration files in order to run, let's write these configuration files for R1 in ~/freeRouter/etc

Code Block

language	bash
theme	Midnight
title	freeRouter hardware configuration file: p4tna-freerouter-hw.txt

int eth0 eth 0000.1111.00fb 127.0.0.1 22710 127.0.0.1 22709
tcp2vrf 2323 v1 23
tcp2vrf 9080 v1 9080

Code Block

language	bash
theme	Midnight
title	freeRouter software configuration file: p4tna-freerouter-sw.txt

hostname p4tna-freerouter
buggy
!
!
vrf definition v1
 exit
!
interface ethernet0
 description freerouter@P4_CPU_PORT[veth251]
 no shutdown
 no log-link-change
 exit
!
interface sdn1
 description freerouter@sdn1[enp0s3]
 mtu 9000
 macaddr 0072.3e18.1b6f
 vrf forwarding v1
 ipv4 address 192.168.0.131 255.255.255.0
 ipv6 address 2a01:e0a:159:2850::666 ffff:ffff:ffff:ffff::
 ipv6 enable
 no shutdown
 no log-link-change
 exit
!
!
!
!
!
!
!
!
!
!
!
!
!
!
server telnet tel
 security protocol telnet
 no exec authorization
 no login authentication
 vrf v1
 exit
!
server p4lang p4
 export-vrf v1 1
 export-port sdn1 0 10
 interconnect ethernet0
 vrf v1
 exit
!
client tcp-checksum transmit
!
end

...

Expand

title	Launch freeRouter control plane along side TOFINO P4 dataplane

Code Block

language	bash
theme	Midnight
title	Setup bf_switchd dataplane communication channel via veth pair and interface adjustment (disable IPv6 at VM guest level, MTU 10240, disable TCP offload etc.)

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6

ip link add veth251 type veth peer name veth250
ip link set veth250  up 
ip link set veth251  up 

ifconfig enp0s3 promisc
ifconfig veth250 promisc
ifconfig veth251 promisc

ip link set dev veth250 up mtu 10240
ip link set dev veth251 up mtu 10240
ip link set dev enp0s3 up mtu 10240
export TOE_OPTIONS="rx tx sg tso ufo gso gro lro rxvlan txvlan rxhash"

for TOE_OPTION in $TOE_OPTIONS; do
    /sbin/ethtool --offload veth250 "$TOE_OPTION" off &> /dev/null
    /sbin/ethtool --offload veth251 "$TOE_OPTION" off &> /dev/null
    /sbin/ethtool --offload enp0s3 "$TOE_OPTION" off &> /dev/null
done

Code Block

language	bash
theme	Midnight
title	freeRouter launch with supplied p4tna-freerouter-hw.txt and p4tna-freerouter-sw.txt with a console prompt

java -jar lib/rtr.jar routersc etc/p4-freerouter-hw.txt etc/p4-freerouter-sw.txt
info cfg.cfgInit.doInit:cfgInit.java:556 booting
info cfg.cfgInit.doInit:cfgInit.java:680 initializing hardware
info cfg.cfgInit.doInit:cfgInit.java:687 applying defaults
info cfg.cfgInit.doInit:cfgInit.java:695 applying configuration
info cfg.cfgInit.doInit:cfgInit.java:721 done
welcome
line ready
freerouter#

Code Block

language	bash
theme	Midnight
title	launch freeRouter pcapInt in order to stitch control plane and P4 bf_switchd dataplane communication

cd ~/freeRouter/bin
./pcapInt.bin veth251 22709 127.0.0.1 22710 127.0.0.1
binded to local port 127.0.0.1 22709.
will send to 127.0.0.1 22710.
pcap version: libpcap version 1.8.1
opening interface veth251 with pcap1.x api
serving others
>

Code Block

language	bash
theme	Midnight
title	Create bf_switchd RARE running environement

mkdir -p ~/rare-run/etc ~/rare-run/logs ~/rare-run/mibs ~/rare-run/snmp

Code Block

language	bash
theme	Midnight
title	create a custom ports.json file for bf_switchd model

cat ~/rare-run/etc/ports.json
{
    "PortToIf" : [
        { "device_port" :  0, "if" : "enp0s3" },
        { "device_port" : 64, "if" : "veth250" }
    ]
}

Code Block

language	bash
theme	Midnight
title	run TOFINO model in quiet mode with bf_router as program and log file (if any) should be in ~/rare-run/logs

cd $SDE
./run_tofino_model.sh -p bf_router -f ~/rare-run/etc/ports.json --log-dir ~/rare-run/logs/ -q

Code Block

language	bash
theme	Midnight
title	Run bf_switchd (logs will be in ~/rare-run/logs)

cd ~/rare-run/logs
 $SDE/run_switchd.sh -p bf_router

Code Block

language	bash
theme	Midnight
title	Launch RARE bf_forwarder.p4 (p4runtime BfRuntime GRPC based interface)

cd ~/rare/bfrt_python/
./bf_forwarder.py --ifmibs-dir ~/rare-run/mibs/ --ifindex ~/rare-run/snmp/ifindex
bf_forwarder.py running on: MODEL
GRPC_ADDRESS: 127.0.0.1:50052
P4_NAME: bf_router
CLIENT_ID: 0
Subscribe attempt #1
Subscribe response received 0
Received bf_router on GetForwarding
Binding with p4_name bf_router
Binding with p4_name bf_router successful!!
BfForwarder - loop
  Clearing Table pipe.ig_ctl.ig_ctl_mpls.tbl_mpls_fib
  Clearing Table pipe.ig_ctl.ig_ctl_acl_in.tbl_ipv6_acl
BfIfSnmpClient - main
BfIfSnmpClient - No active ports
  Clearing Table pipe.ig_ctl.ig_ctl_ipv4.tbl_ipv4_fib_host
  Clearing Table pipe.ig_ctl.ig_ctl_copp.tbl_ipv6_copp
  Clearing Table pipe.ig_ctl.ig_ctl_acl_in.tbl_ipv4_acl
  Clearing Table pipe.ig_ctl.ig_ctl_ipv6.tbl_ipv6_fib_host
  Clearing Table pipe.ig_ctl.ig_ctl_mpls.tbl_mpls_fib_decap
  Clearing Table pipe.ig_ctl.ig_ctl_nexthop.tbl_nexthop
  Clearing Table pipe.ig_ctl.ig_ctl_vlan_out.tbl_vlan_out
  Clearing Table pipe.ig_ctl.ig_ctl_vlan_in.tbl_vlan_in
  Clearing Table pipe.ig_ctl.ig_ctl_acl_out.tbl_ipv6_acl
  Clearing Table pipe.ig_ctl.ig_ctl_ipv4.tbl_ipv4_fib_lpm
  Clearing Table pipe.ig_ctl.ig_ctl_acl_out.tbl_ipv4_acl
  Clearing Table pipe.ig_ctl.ig_ctl_vrf.tbl_vrf
  Clearing Table pipe.ig_ctl.ig_ctl_copp.tbl_ipv4_copp
  Clearing Table pipe.ig_ctl.ig_ctl_ipv6.tbl_ipv6_fib_lpm
  Clearing Table pipe.ig_ctl.ig_ctl_bridge.tbl_bridge_target
  Clearing Table pipe.ig_ctl.ig_ctl_bridge.tbl_bridge_learn
Bundle specific clearing: (Order matters)
  Clearing Bundle Table pipe.ig_ctl.ig_ctl_bundle.tbl_nexthop_bundle
  Clearing Bundle Table pipe.ig_ctl.ig_ctl_bundle.ase_bundle
  Clearing Bundle Table pipe.ig_ctl.ig_ctl_bundle.apr_bundle
BfForwarder - Main
BfForwarder - Entering message loop
rx: ['myaddr4_add', '224.0.0.0/4', '0', '1', '\n']
BfIfStatus - main
BfIfStatus - No active ports
rx: ['myaddr4_add', '255.255.255.255/32', '0', '1', '\n']
BfSubIfCounter - main
BfSubIfCounter - No active ports
rx: ['myaddr6_add', 'ff00::/8', '0', '1', '\n']
rx: ['myaddr4_add', '192.168.0.0/24', '-1', '1', '\n']
rx: ['myaddr4_add', '192.168.0.131/32', '-1', '1', '\n']
rx: ['myaddr6_add', '2a01:e0a:159:2850::/64', '-1', '1', '\n']
rx: ['myaddr6_add', '2a01:e0a:159:2850::666/128', '-1', '1', '\n']
rx: ['myaddr6_add', 'fe80::/64', '-1', '1', '\n']
rx: ['mylabel4_add', '186286', '1', '\n']
rx: ['mylabel6_add', '842368', '1', '\n']
rx: ['state', '0', '1', '10', '\n']
rx: ['mtu', '0', '9000', '\n']
rx: ['portvrf_add', '0', '1', '\n']
rx: ['neigh6_add', '20989', 'fe80::224:d4ff:fea0:cd3', '00:24:d4:a0:0c:d3', '1', '00:72:3e:18:1b:6f', '0', '\n']
BfIfSnmpClient - added stats for port 0
rx: ['keepalive', '\n']
rx: ['neigh4_add', '29777', '192.168.0.254', '00:24:d4:a0:0c:d3', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
rx: ['neigh6_add', '25745', 'fe80::bc6a:83ad:7897:8461', '00:13:46:3c:a9:4f', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
rx: ['neigh6_add', '41106', 'fe80::e23f:49ff:fe6d:1899', 'e0:3f:49:6d:18:99', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
rx: ['neigh6_add', '35111', '2a01:e0a:159:2850:e23f:49ff:fe6d:1899', 'e0:3f:49:6d:18:99', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
rx: ['neigh6_del', '25745', 'fe80::bc6a:83ad:7897:8461', '00:13:46:3c:a9:4f', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
rx: ['neigh6_add', '20371', 'fe80::bc6a:83ad:7897:8461', '00:13:46:3c:a9:4f', '1', '00:72:3e:18:1b:6f', '0', '\n']
rx: ['keepalive', '\n']
...
rx: ['keepalive', '\n']
rx: ['neigh4_add', '34182', '192.168.0.62', 'e0:3f:49:6d:18:99', '1', '00:72:3e:18:1b:6f', '0', '\n']
...

...

Expand

title	Check telnet access for freerouter@2323

Code Block

language	bash
theme	Midnight
title	FreeRouter telnet access from Virtualbox VM guest via port 2323

telnet localhost 2323
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
welcome
line ready
tna-freerouter#

Expand

title	Check running-config

Code Block

language	bash
theme	Midnight
title	freerouter running configuration

p4tna-freerouter#term len 0                                                       
p4tna-freerouter#sh run                                                           
hostname p4tna-freerouter
buggy
!
!
vrf definition v1
 exit
!
interface ethernet0
 description freerouter@P4_CPU_PORT[veth251]
 no shutdown
 no log-link-change
 exit
!
interface sdn1
 description freerouter@sdn1[enp0s9]
 mtu 9000
 macaddr 0072.3e18.1b6f
 vrf forwarding v1
 ipv4 address 192.168.0.131 255.255.255.0
 ipv6 address 2a01:e0a:159:2850::666 ffff:ffff:ffff:ffff::
 ipv6 enable
 no shutdown
 no log-link-change
 exit
!
!
!
!
!
!
!
!
!
!
!
!
!
!
server telnet tel
 security protocol telnet
 no exec authorization
 no login authentication
 vrf v1
 exit
!
server p4lang p4
 export-vrf v1 1
 export-port sdn1 0 10
 interconnect ethernet0
 vrf v1
 exit
!
client tcp-checksum transmit
!
end

Code Block

language	bash
theme	Midnight
title	Check control plane is communicating with bf_switchd p4 dataplane

p4tna-freerouter#sh int sum                                                       
interface  state  tx     rx         drop
ethernet0  up     89955  128007451  0
sdn1       up     87291  127572417  0

...

Expand

title	Connectivity IPv4/IPv6 check for freeRouter

Code Block

language	bash
theme	Midnight
title	Ping IPv4 from freerouter -> LAN router gateway

p4tna-freerouter#ping 192.168.0.254 /vrf v1 /repeat 11111                         
pinging 192.168.0.254, src=null, cnt=11111, len=64, tim=1000, ttl=255, tos=0, sweep=false
..!........!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*
result=95%, recv/sent/lost=197/207/10, rtt min/avg/max/total=27/54/645/20764

Note
The output above indicates that there are packet losses. This is due to the fact fact as soon as bf_switch port 0 is bridged to enp0s3 on the local area netwrok it receives a lot of packet. These packet have to be process by bf_switchd increasing the processing delay as all the packet received via enp0s3 has to be queued and processed by bf_switchd model.

Code Block

language	bash
theme	Midnight
title	IPv4 arp check

p4tna-freerouter#sh ipv4 arp sdn1                                                 
mac             address        time      static
e03f.496d.1899  192.168.0.62   00:05:27  false    <----- Host server
9ceb.e8d5.2c51  192.168.0.77   00:05:27  false    <----- VM guest bridged IP
0024.d4a0.0cd3  192.168.0.254  00:01:27  false    <----- LAN gateway

Code Block

language	bash
theme	Midnight
title	Ping IPv6 from freerouter -> Host server and SSH connection test

p4tna-freerouter#..1:e0a:159:2850:e23f:49ff:fe6d:1899 /vrf v1 /repeat 111111      
pinging 2a01:e0a:159:2850:e23f:49ff:fe6d:1899, src=null, cnt=111111, len=64, tim=1000, ttl=255, tos=0, sweep=false
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*
result=100%, recv/sent/lost=89/89/0, rtt min/avg/max/total=30/50/600/4467

Code Block

language	bash
theme	Midnight
title	IPv6 neighbor discovery check

p4tna-freerouter#show ipv6 neighbors sdn1                                         
mac             address                                time      static  router
0024.d4a0.0cd3  2a01:e0a:159:2850::1                   00:00:26  false   false    <----- LAN gateway
e03f.496d.1899  2a01:e0a:159:2850:e23f:49ff:fe6d:1899  00:03:26  false   false    <----- Host server
0024.d4a0.0cd3  fe80::224:d4ff:fea0:cd3                00:01:26  false   false
e03f.496d.1899  fe80::e23f:49ff:fe6d:1899              00:02:26  false   false

Code Block

language	bash
theme	Midnight
title	Initiate IPv4 ssh from freerouter -> LAN router gateway

p4tna-freerouter#ssh 192.168.0.62 /vrf v1 /user my-nas                           
 - connecting to 192.168.0.62 22
password: *******
                
 - securing connection

Last login: Fri Jul  3 10:57:02 2020 from 192.168.0.66
FreeBSD 11.3-RELEASE-p9 (FreeNAS.amd64) #0 r325575+588899735f7(HEAD): Mon Jun  1 15:04:31 EDT 2020

        FreeNAS (c) 2009-2020, The FreeNAS Development Team
        All rights reserved.
        FreeNAS is released under the modified BSD license.

        For more information, documentation, help or support, go here:
        http://freenas.org
Welcome to FreeNAS
MY-NAS%

Code Block

language	bash
theme	Midnight
title	Initiate IPv6 ssh from freerouter -> LAN router gateway

p4tna-freerouter#..:e0a:159:2850:e23f:49ff:fe6d:1899 /vrf v1 /user my-nas        
 - connecting to 2a01:e0a:159:2850:e23f:49ff:fe6d:1899 22
password: *******
                
 - securing connection

Last login: Mon Jul  6 11:05:31 2020 from 192.168.0.131
FreeBSD 11.3-RELEASE-p9 (FreeNAS.amd64) #0 r325575+588899735f7(HEAD): Mon Jun  1 15:04:31 EDT 2020

        FreeNAS (c) 2009-2020, The FreeNAS Development Team
        All rights reserved.
        FreeNAS is released under the modified BSD license.

        For more information, documentation, help or support, go here:
        http://freenas.org
Welcome to FreeNAS
MY-NAS%

...

had a demonstration of how to integrate freeRouter into a local area network (Similar to article #002)
However instead of using bmv2 we used a INTEL/BAREFOOT P4 dataplane called: TOFINO (bf_switchd)
TOFINO bf_switchd target is running RARE bf_router.p4
communication between freeRouter control plane and TOFINO is ensured by pcapInt via veth pair [ veth250 - veth251 ]
This communication is possible via RARE bf_forwarder.py based on GRPC P4Lang BfRuntime python binding
In this example the TOFINO bf_switchd P4 virtual switch model has only 1 dataplane interface that is bound to enp0s3 VM interface exposed to the local network as a bridged interface

...

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