Change Details

Packetdrill has to be extended to support evaluating the AE bit. Establishing an active or passive TCP session with the SYN marked with the different IP ECN combinations will result in the prescribed signalling.

``` // Testing AccECN handshakes // Both Client and Server, as well as parallel SYN --tolerance_usecs=2000000 // Set sysctl defaults 0.0 `sysctl net.inet.tcp.cc.algorithm=newreno` +0.1 `sysctl net.inet.tcp.functions_default=freebsd` +0.1 `sysctl net.inet.tcp.initcwnd_segments=10` +0.1 `sysctl net.inet.tcp.ecn.enable=4` +0.1 `sysctl net.inet.tcp.hostcache.purgenow=1` +0.1 `dmesg -c` // Test Server side // Establish a regular TCP ECN connection. +0.0 `echo 'server: regular ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[noecn] SEW 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 4 +0.00 close(4) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, non-ECT +0.0 `echo 'server: AccECN non-ECT'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[noecn] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 5 +0.00 close(5) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT0 +0.0 `echo 'server: AccECN ECT0'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ect0] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SA. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 6 +0.00 close(6) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT1 +0.0 `echo 'server: AccECN ECT1'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ect1] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SEW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 7 +0.00 close(7) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, CE +0.0 `echo 'server: AccECN CE'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ce] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SAW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 8 +0.00 close(8) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Test Client Side // Establish a regular TCP connection. +0.0 `echo 'client: no ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S 0:0(0) win 65535 <...> +0.00 <[noecn] S. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 +0.0 `echo 'client: AccECN to non-ECN'` +0.10 `sysctl net.inet.tcp.ecn.enable=3` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] S. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 +0.0 `echo 'client: AccECN to RFC3168 ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] SE. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, non-ECT +0.0 `echo 'client: AccECN non-ECT SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .2 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT0 +0.0 `echo 'client: AccECN ECT0 SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect0] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .4 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT1 +0.0 `echo 'client: AccECN ECT1 SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect1] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .3 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, CE +0.0 `echo 'client: AccECN CE SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ce] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .6 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Simultaneous Open // Establish a regular TCP ECN connection. +0.0 `echo 'parallel open: ECN'` +0.10 `sysctl net.inet.tcp.ecn.enable=1` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] SEW 0:0(0) win 65535 <...> +0.00 <[noecn] SEW 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SE. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] PW. 1:1001(1000) ack 1 win 65535 +0.00 <[noecn] E. 1:1(0) ack 1001 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] PW. 1001:2001(1000) ack 1 win 65535 +0.00 <[ce] . 1:2(1) ack 2001 win 65535 // rack: ect0?? +0.00 >[noecn] E. 2001:2001(0) ack 2 win 65535 +0.00 close(3) = 0 // Establish an AccECN TCP ECN without ECT +0.0 `echo 'parallel open: AccECN non-ECT'` +0.10 `sysctl net.inet.tcp.ecn.enable=3` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with ECT0 +0.0 `echo 'parallel open: AccECN ECT0'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect0] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SA. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with ECT1 +0.0 `echo 'parallel open: AccECN ECT1'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect1] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SEW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with CE +0.0 `echo 'parallel open: AccECN CE'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ce] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SAW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .6 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .7 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.7 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .0 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 `{ dmesg sysctl net.inet.tcp.functions_default=freebsd; sysctl net.inet.tcp.cc.algorithm=newreno; sysctl net.inet.tcp.initcwnd_segments=10; sysctl net.inet.tcp.rfc3465=1; sysctl net.inet.tcp.rfc1323=1; sysctl net.inet.tcp.sack.enable=1; sysctl net.inet.tcp.rexmit_slop=200; sysctl net.inet.tcp.rexmit_min=30; sysctl net.inet.tcp.rexmit_initial=1000; sysctl net.inet.tcp.ecn.enable=2; }` ```

Packetdrill has to be extended to support evaluating the AE bit. Establishing an active or passive TCP session with the SYN marked with the different IP ECN combinations will``` result in the prescribed signalling.// Testing AccECN handshakes // Both Client and Server, as well as parallel SYN --tolerance_usecs=2000000 // Set sysctl defaults 0.0 `sysctl net.inet.tcp.cc.algorithm=newreno` +0.1 `sysctl net.inet.tcp.functions_default=freebsd` +0.1 `sysctl net.inet.tcp.initcwnd_segments=10` +0.1 `sysctl net.inet.tcp.ecn.enable=4` +0.1 `sysctl net.inet.tcp.hostcache.purgenow=1` +0.1 `dmesg -c` // Test Server side // Establish a regular TCP ECN connection. +0.0 `echo 'server: regular ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[noecn] SEW 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 4 +0.00 close(4) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, non-ECT +0.0 `echo 'server: AccECN non-ECT'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[noecn] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 5 +0.00 close(5) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT0 +0.0 `echo 'server: AccECN ECT0'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ect0] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SA. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 6 +0.00 close(6) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT1 +0.0 `echo 'server: AccECN ECT1'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ect1] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SEW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 7 +0.00 close(7) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, CE +0.0 `echo 'server: AccECN CE'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.01 bind(3, ..., ...) = 0 +0.01 listen(3, 1) = 0 +0.04 <[ce] S7 0:0(0) win 65535 <mss 1000, wscale 10, eol > +0.00 >[noecn] SAW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] . 1:1(0) ack 1 win 65535 +0.00 accept(3, ..., ...) = 8 +0.00 close(8) = 0 +0.00 >[noecn] R. 1:1(0) ack 1 win 0 +0.00 close(3) = 0 // Test Client Side // Establish a regular TCP connection. +0.0 `echo 'client: no ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S 0:0(0) win 65535 <...> +0.00 <[noecn] S. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 +0.0 `echo 'client: AccECN to non-ECN'` +0.10 `sysctl net.inet.tcp.ecn.enable=3` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] S. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 +0.0 `echo 'client: AccECN to RFC3168 ECN'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] SE. 0:0(0) ack 1 win 65535 +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, non-ECT +0.0 `echo 'client: AccECN non-ECT SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .2 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT0 +0.0 `echo 'client: AccECN ECT0 SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect0] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .4 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, ECT1 +0.0 `echo 'client: AccECN ECT1 SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect1] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .3 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .5 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish a AccECN TCP session, CE +0.0 `echo 'client: AccECN CE SYNACK'` +0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ce] SW. 0:0(0) ack 1 win 65535 +0.00 >[noecn] .6 1:1(0) ack 1 win 65535 +0.00 <[noecn] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Simultaneous Open // Establish a regular TCP ECN connection. +0.0 `echo 'parallel open: ECN'` +0.10 `sysctl net.inet.tcp.ecn.enable=1` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] SEW 0:0(0) win 65535 <...> +0.00 <[noecn] SEW 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SE. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SE. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] . 1:1(0) ack 1 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] PW. 1:1001(1000) ack 1 win 65535 +0.00 <[noecn] E. 1:1(0) ack 1001 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] PW. 1001:2001(1000) ack 1 win 65535 +0.00 <[ce] . 1:2(1) ack 2001 win 65535 // rack: ect0?? +0.00 >[noecn] E. 2001:2001(0) ack 2 win 65535 +0.00 close(3) = 0 // Establish an AccECN TCP ECN without ECT +0.0 `echo 'parallel open: AccECN non-ECT'` +0.10 `sysctl net.inet.tcp.ecn.enable=3` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[noecn] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with ECT0 +0.0 `echo 'parallel open: AccECN ECT0'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect0] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SA. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with ECT1 +0.0 `echo 'parallel open: AccECN ECT1'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ect1] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SEW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .5 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .6 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.6 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .7 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 // Establish an AccECN TCP ECN with CE +0.0 `echo 'parallel open: AccECN CE'` +0.40 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0.01 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0.01 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=0}, 8) = 0 +0.04 connect(3, ..., ...) = -1 // EINPROGRESS +0.00 >[noecn] S7 0:0(0) win 65535 <...> +0.00 <[ce] S7 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] SAW. 0:0(0) ack 1 win 65535 <...> +0.00 <[noecn] SW. 0:0(0) ack 1 win 65535 <mss 1000> +0.00 >[noecn] .6 1:1(0) ack 1 win 65535 +0.00 <[ce] .5 1:2(1) ack 1 win 65535 +0.04 >[noecn] .7 1:1(0) ack 2 win 65535 +0.05 write(3, ..., 1000) = 1000 +0.00 >[ect0] P.7 1:1001(1000) ack 2 win 65535 +0.00 <[ce] .5 2:3(1) ack 1001 win 65535 +0.00 >[noecn] .0 1001:1001(0) ack 3 win 65535 +0.01 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 +0.01 fcntl(3, F_SETFL, O_RDWR) = 0 +0.00 close(3) = 0 `{ dmesg sysctl net.inet.tcp.functions_default=freebsd; sysctl net.inet.tcp.cc.algorithm=newreno; sysctl net.inet.tcp.initcwnd_segments=10; sysctl net.inet.tcp.rfc3465=1; sysctl net.inet.tcp.rfc1323=1; sysctl net.inet.tcp.sack.enable=1; sysctl net.inet.tcp.rexmit_slop=200; sysctl net.inet.tcp.rexmit_min=30; sysctl net.inet.tcp.rexmit_initial=1000; sysctl net.inet.tcp.ecn.enable=2; }` ```