Description of problem:

These functions:

  inet6_addr_add()
  ipv6_add_addr()
  inet6_addr_del()

don't set the extack in case of failure. In some situations, the extack would be useful for users to understand the problem without having to read kernel code.


Version-Release number of selected component (if applicable):
any version (tested on 6.2)


Actual results:
# ip addr add dev enp1s0 fd01::1/60 mngtmpaddr
RTNETLINK answers: Invalid argument

# echo 1 > /proc/sys/net/ipv6/conf/enp7s0/disable_ipv6
# ip addr add dev enp7s0 fd01::1
RTNETLINK answers: Permission denied

# ip addr del dev enp1s0 fd01::1234/64
RTNETLINK answers: Cannot assign requested address


Expected results:
Something like:
# ip addr add dev enp1s0 fd01::1/60 mngtmpaddr
Error: ipv6: addresses with mngtmpaddr flag must have prefix length 64

# echo 1 > /proc/sys/net/ipv6/conf/enp7s0/disable_ipv6
# ip addr add dev enp7s0 fd01::1
Error: ipv6: IPv6 is disabled on the interface

# ip addr del dev enp1s0 fd01::1234/64
Error: ipv6: address not found