Use /proc/sys/net/core/dev_weight to determine if we are in the root netns. #10711
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…netns.
After 19249c0724f2 ("net: make net.core.{r,w}mem_{default,max} namespaced")
/proc/sys/net/core/rmem_default is present in non-initial netns as well.
/proc/sys/net/core/dev_weight has existed from the beginning of Linux git repo
in 1da177e4c3f4 ("Linux-2.6.12-rc2"). So it should be safe to use this file.
Demo:
```
$ sudo ip netns add foo
$ sudo ip netns exec foo stat /proc/sys/net/core/dev_weight
stat: cannot statx '/proc/sys/net/core/dev_weight': No such file or directory
$ sudo ip netns delete foo
```
Fixes #10704
PiperOrigin-RevId: 658087447
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Use /proc/sys/net/core/dev_weight to determine if we are in the root netns.
After 19249c0724f2 ("net: make net.core.{r,w}mem_{default,max} namespaced")
/proc/sys/net/core/rmem_default is present in non-initial netns as well.
/proc/sys/net/core/dev_weight has existed from the beginning of Linux git repo
in 1da177e4c3f4 ("Linux-2.6.12-rc2"). So it should be safe to use this file.
Demo:
Fixes #10704