Susant Sahani
4eb086a387
Fillup IFLA_INET6_ADDR_GEN_MODE while we do link_up.
Fixes the following error:
```
dummy-test: Could not bring up interface: Invalid argument
```
After reading the kernel code when we do a link up
```
net/core/rtnetlink.c
IFLA_AF_SPEC
af_ops->set_link_af(dev, af);
inet6_set_link_af
if (tb[IFLA_INET6_ADDR_GEN_MODE])
Here it looks for IFLA_INET6_ADDR_GEN_MODE
```
Since link up we didn't filling up that it's failing.
Closes #12504.
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