This is ported from packetdrill 2.0.

This is from packetdrill 2.0 with the addition of support for
--define=PROTO=132

You can use -Dproto=IPPROTO_SCTP or --define proto=IPPROTO_SCTP
and run the script
```
 0.0 socket(..., SOCK_STREAM, proto) = 3
+0.0 close (3)
```
to control the protocol being used from the command line.

This avoids conflics with definitions on Solaris 10.4.

MacOS provides an older version of bison which results in
macro redifinitions for CMSG_LEN and CMSG_DATA. Renaming
them resolves this.

Use the IANA assigned option number for the TCP Fast Open option.
Use EXP-FO instead of TO for using the deprecate experimental option.

This is based on https://github.com/freebsd-net/packetdrill/pull/15
but adds support for af_arg, getsockopt() and clearing the
acceptfilter.

In order to simulate delayed packets, there are occasions where responses
to those packets need to be ignored insofar as they modify relative sequence
numbers or timestamps. For example a retransmitted SYN or SYN-ACK might be delayed
until after the TCP session ends, but a combination of bugs on the client and server
might result in the session persisting as if it never ended.

inbound injected packet:  0.100034 S 0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0>
outbound sniffed packet:  0.100083 S. 3079308609:3079308609(0) ack 1 win 65535 <mss 1460,nop,wscale 4,sackOK,TS val 3206488061 ecr 100>
inbound injected packet:  0.150127 . 1:101(100) ack 3079308610 win 1031 <nop,nop,TS val 150 ecr 3206488061>
outbound sniffed packet:  0.150170 . 3079308610:3079308610(0) ack 101 win 12495 <nop,nop,TS val 3206488111 ecr 150>
outbound sniffed packet:  0.150192 P. 3079308610:3079309010(400) ack 101 win 12501 <nop,nop,TS val 3206488111 ecr 150>
inbound injected packet:  0.200251 . 101:101(0) ack 3079309010 win 1024 <nop,nop,TS val 200 ecr 3206488111>
inbound injected packet:  0.200271 F. 101:101(0) ack 3079309010 win 1031 <nop,nop,TS val 200 ecr 3206488111>
outbound sniffed packet:  0.200287 . 3079309010:3079309010(0) ack 102 win 12501 <nop,nop,TS val 3206488161 ecr 200>
outbound sniffed packet:  0.200324 F. 3079309010:3079309010(0) ack 102 win 12501 <nop,nop,TS val 3206488161 ecr 200>
inbound injected packet:  0.250354 . 102:102(0) ack 3079309011 win 1031 <nop,nop,TS val 250 ecr 3206488161>
inbound injected packet:  0.265380 S 0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0>
outbound sniffed packet:  0.265402 S. 3079308609:3079308609(0) ack 1 win 65535 <mss 1460,nop,wscale 4,sackOK,TS val 3118763918 ecr 100>
inbound injected packet:  0.300437 . 1:1(0) ack 3079308610 win 1031 <nop,nop,TS val 150 ecr 3206488061>
outbound sniffed packet:  0.300455 R 3079308610:3079308610(0) win 0

 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0.000 bind(3, ..., ...) = 0
+0.000 listen(3, 1) = 0
+0.100 < S  0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0>
+0.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 4,sackOK,TS val 200 ecr 100>
+0.050 < . 1:101(100) ack 1 win 1031 <nop, nop, TS val 150 ecr 200>
+0.000 accept(3, ..., ...) = 4
+0.000 read(4, ..., 100) = 100
+0.000 write(4, ..., 400) = 400
+0.000 > . 1:1(0) ack 101 win 12495 <nop, nop, TS val 250 ecr 150>
+0.000 > P. 1:401(400) ack 101 win 12501 <nop, nop, TS val 250 ecr 150>
+0.050 < . 101:101(0) ack 401 win 1024 <nop, nop, TS val 200 ecr 250>
+0.000 < F. 101:101(0) ack 401 win 1031 <nop, nop, TS val 200 ecr 250>
+0.000 > . 401:401(0) ack 102 win 12501 <nop, nop, TS val 300 ecr 200>
+0.000 close(4) = 0
+0.000 > F. 401:401(0) ack 102 win 12501 <nop, nop, TS val 300 ecr 200>
+0.050 < . 102:102(0) ack 402 win 1031 <nop, nop, TS val 250 ecr 300>
+0.015 < S  0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0!>
+0.000 > S. ...(0) ack 1 win 65535 <mss 1460,nop,wscale 4,sackOK,TS val ... ecr 100>
+0.035 < . 1:1(0) ack 1 win 1031 <nop, nop, TS val 150 ecr 200>
+0.000 > . 1:1(0) ack 1 win 12501 <nop, nop, TS val 200 ecr 150>

Sponsored by:	Netlix, Inc.

Sponsored by:	Netflix, Inc.

This adds support for SCTP/UDP and TCP/UDP including ICMP
support.

Sponsored by:	Netflix, Inc.

This is based on a patch from Jason Eggleston with minor modifications
from me.