[Bug 250363] [tcp] data in syn_ack should be ignored

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250363

            Bug ID: 250363
           Summary: [tcp] data in syn_ack should be ignored
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yonghaoz1994 at gmail.com

data in syn_ack should be ignored as the following packetdrill script shows:

```
0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
0.000 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
0.000 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0

// Establish connection and verify that there was no error.
0.100 connect(3, ..., ...) = -1
0.100 > S 0:0(0) <...>

+0.1 < S. 1:513(512) ack 1 win 19712 
// f-stack/FreeBSD ack 513, Linux ack 1
+0.1 > . 1:1(0) ack 1

```

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