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https://bugzilla.mindrot.org/show_bug.cgi?id=3631

Bug ID: 3631
Summary: ssh fe80 -b invalid argument failure
Product: Portable OpenSSH
Version: 8.9p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: ssh
Assignee: unassigned-bugs@mindrot.org
Reporter: rainer.burki@asdfg.it

The ssh client does not allow to bind to a local fe80 address if the
address is specified with the option -b <ipv6-addr>. It though works
when specifying it with -B <interface>

The following is from a ubuntu 22.04 trying to connect to another
ubuntu 22.04.

We will use the local eth0 inet6 address fe80::250:56ff:fe00:243d for
binding:

vmadmin@li224-vmLS1:~$ ip add
...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
state UP group default qlen 1000
link/ether 00:50:56:00:24:3d brd ff:ff:ff:ff:ff:ff
altname enp3s0
altname ens160
inet 192.168.110.61/24 brd 192.168.110.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe00:243d/64 scope link
valid_lft forever preferred_lft forever
vmadmin@li224-vmLS1:~$ ssh -B eth0 fe80::250:56ff:fe00:241e
vmadmin@fe80::250:56ff:fe00:241e's password:
<snip, works>

Same again with -b:

vmadmin@li224-vmLS1:~$ ssh -b fe80::250:56ff:fe00:243d
fe80::250:56ff:fe00:241e
bind fe80::250:56ff:fe00:243d: Invalid argument
ssh: connect to host fe80::250:56ff:fe00:241e port 22: failure
vmadmin@li224-vmLS1:~$

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