[Bug 890] lib/ip_frag: IPv4 options without copied bit set are present in all fragments

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=890

            Bug ID: 890
           Summary: lib/ip_frag: IPv4 options without copied bit set are
                    present in all fragments
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: dsosnowski@nvidia.com
  Target Milestone: ---

As of 21.11-rc4 ip_fragmentation library implementation for IPv4 seems to
ignore "copied" bit of IPv4 options. IPv4 options are copied over to all
fragments regardless of "copied" bit set to 0.

Setup assumptions:

1) Two machines:
1.1) Machine A, with two ports, running dpdk-ip_fragmentation example
application.
1.2) Machine B, with two ports, running scapy. Acts as a traffic generator.

Steps to reproduce:

1) Start examples/dpdk-ip_fragmentation application on machine A:

```
sudo ./build/examples/dpdk-ip_fragmentation -a 08:00.0 -a 08:00.1 -- -p 0x3 -q
1
```

2) Start sniffing for traffic using scapy on machine B:
3) Using scapy send a following packet, IP packet with additional NOP option
with copy flag set to 0, from machine B:

```
packet = (
    Ether(src='0c:42:a1:d1:d1:8c', dst='0c:42:a1:d1:d0:48') /
    IP(src='100.10.0.1', dst='100.20.0.1', options=[IPOption(option=1,
copy_flag=0), IPOption(option=0, copy_flag=0)]) /
    UDP(sport=55555, dport=12345) /
    Raw(load=b'a' * 2000)
)
```

What should happen:

1) Machine B should receive two IP fragments:
1.1) 1st fragment with IP options present.
1.2) 2nd fragment without IP options.

What actually happens:

1) Machine B receives two IP fragments with IP options present.

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