netdev - Re: [PATCH net-next 1/2] netns: Parse NETNSA_FD and NETNSA

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Date:   Wed, 15 Jan 2020 14:30:13 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Guillaume Nault <gnault@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] netns: Parse NETNSA_FD and NETNSA_PID as
 signed integers

Le 14/01/2020 à 23:25, Guillaume Nault a écrit :
> These attributes represent signed values (file descriptors and PIDs).
> Make that clear in nla_policy.
> 
> Signed-off-by: Guillaume Nault <gnault@...hat.com>
> ---
>  net/core/net_namespace.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
> index 6412c1fbfcb5..85c565571c1c 100644
> --- a/net/core/net_namespace.c
> +++ b/net/core/net_namespace.c
> @@ -706,8 +706,8 @@ static struct pernet_operations __net_initdata net_ns_ops = {
>  static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = {
>  	[NETNSA_NONE]		= { .type = NLA_UNSPEC },
>  	[NETNSA_NSID]		= { .type = NLA_S32 },
> -	[NETNSA_PID]		= { .type = NLA_U32 },
> -	[NETNSA_FD]		= { .type = NLA_U32 },
> +	[NETNSA_PID]		= { .type = NLA_S32 },
> +	[NETNSA_FD]		= { .type = NLA_S32 },
Please, keep them consistent with IFLA_NET_NS_*:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/core/rtnetlink.c?h=v5.5-rc6#n1793

>  	[NETNSA_TARGET_NSID]	= { .type = NLA_S32 },
>  };
>  
> @@ -731,10 +731,10 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh,
>  	nsid = nla_get_s32(tb[NETNSA_NSID]);
>  
>  	if (tb[NETNSA_PID]) {
> -		peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID]));
> +		peer = get_net_ns_by_pid(nla_get_s32(tb[NETNSA_PID]));
Same here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/core/rtnetlink.c?h=v5.5-rc6#n2115


Thank you,
Nicolas