Christian Brauner 375d51caaa netns: allow negative nsid ... If the kernel receives a negative nsid it will automatically assign the next available nsid. In this case alloc_netid() will set min and max to 0 for ird_alloc(). And when max == 0 idr_alloc() will interpret this as the maximum range, i.e. specific to nsids it will try to find an id in the range [0,INT_MAX). This is intentionally supported in the kernel for nsids. Commit acbe9118ce ("ip netns: use strtol() instead of atoi()") regressed ip netns in that respect although previously the use-case was either accidentally supported or opaquely supported such that it triggered the original commit. From what I can gather it went as follows before: atoi() was called with a string indicating a negative value which caused it to return -1 which was passed to the kernel. Let's make it less opaque by introducing the keyword "auto": ip netns set <netns-name> auto will cause nsid to be set to -1 and the kernel will select an available nsid. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>		2018-02-08 07:57:34 -08:00
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man3	SPDX license identifiers	2017-11-24 12:21:35 -08:00
man7	SPDX license identifiers	2017-11-24 12:21:35 -08:00
man8	netns: allow negative nsid	2018-02-08 07:57:34 -08:00
Makefile	SPDX license identifiers	2017-11-24 12:21:35 -08:00