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Description of problem:
Case #1 from bz#1791544 also verifies on 'ip xfrm policy help' command:

How reproducible:
# ip xfrm policy help

Actual results:
UPSPEC := proto { { tcp | tcp | tcp | tcp } [ sport PORT ] [ dport PORT ] |
                  { icmp | icmp | icmp } [ type NUMBER ] [ code NUMBER ] |
                  gre [ key { DOTTED-QUAD | NUMBER } ] | PROTO }

Expected results:
UPSPEC := proto { { tcp | udp | sctp | dccp } [ sport PORT ] [ dport PORT ] |
                  { icmp | ipv6-icmp | mobility-header } [ type NUMBER ] [ code NUMBER ] |
                  gre [ key { DOTTED-QUAD | NUMBER } ] | PROTO }

Patch submitted upstream: https://patchwork.ozlabs.org/patch/1230947/

Patch accepted upstream:

commit 38dd041bfe773e481ebf9c8250e49c665af2e215
Author: Andrea Claudi <aclaudi>
Date:   Wed Jan 29 15:56:40 2020 +0100

    ip-xfrm: Fix help messages

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (iproute bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4478