[PATCH net-next v4 1/4] netns: add genl cmd to add and get peer netns ids
nicolas.dichtel at 6wind.com
Fri Oct 31 09:41:24 UTC 2014
Le 30/10/2014 19:35, Eric W. Biederman a écrit :
> Nicolas Dichtel <nicolas.dichtel at 6wind.com> writes:
>> With this patch, a user can define an id for a peer netns by providing a FD or a
>> PID. These ids are local to netns (ie valid only into one netns).
> Scratches head. Do you actually find value in using the pid instead of
> a file descriptor?
I copied the mechanism from rtnl_link_get_net():
First check if the user provides a PID, if not, check for a FD.
> Doing things by pid was an early attempt to make things work, and has
> been a bit clutsy. If you don't find value in it I would recommend just
> supporting getting/setting the network namespace by file descriptor.
Hmm, if I understand well, it's what is done in the patch:
>> +static int netns_nl_cmd_newid(struct sk_buff *skb, struct genl_info *info)
>> + if (info->attrs[NETNSA_PID])
>> + peer = get_net_ns_by_pid(nla_get_u32(info->attrs[NETNSA_PID]));
>> + else if (info->attrs[NETNSA_FD])
>> + peer = get_net_ns_by_fd(nla_get_u32(info->attrs[NETNSA_FD]));
>> + else
>> + return -EINVAL;
>> + if (IS_ERR(peer))
>> + return PTR_ERR(peer);
Am I right?
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