netdev - Re: [RFC Patch net-next 2/5] net: introduce generic inet

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Date:	Thu, 27 Jun 2013 16:32:04 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Cong Wang <amwang@...hat.com>
CC:	<netdev@...r.kernel.org>, Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	"Jiri Pirko" <jiri@...nulli.us>,
	Eric Dumazet <edumazet@...gle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [RFC Patch net-next 2/5] net: introduce generic inet_pton()

On Thu, 2013-06-27 at 14:43 +0800, Cong Wang wrote:
> Signed-off-by: Cong Wang <amwang@...hat.com>
> ---
>  include/net/inet_addr.h |   20 ++++++++++++++++++++
>  net/core/netpoll.c      |   24 ++----------------------
>  2 files changed, 22 insertions(+), 22 deletions(-)
> 
> diff --git a/include/net/inet_addr.h b/include/net/inet_addr.h
> index 66a16fe..1379287 100644
> --- a/include/net/inet_addr.h
> +++ b/include/net/inet_addr.h
> @@ -4,6 +4,7 @@
>  #include <linux/in.h>
>  #include <linux/in6.h>
>  #include <linux/socket.h>
> +#include <linux/inet.h>
>  #include <net/addrconf.h>
>  
>  union inet_addr {
> @@ -59,4 +60,23 @@ static inline bool inet_addr_multicast(const union inet_addr *ipa)
>  }
>  #endif
>  
> +static inline int inet_pton(const char *str, union inet_addr *addr)
> +{
> +	const char *end;
> +
> +	if (!strchr(str, ':') &&
> +	    in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
> +		if (!*end)
> +			return 0;
> +	}
> +	if (in6_pton(str, -1, addr->sin6.sin6_addr.s6_addr, -1, &end) > 0) {
> +#if IS_ENABLED(CONFIG_IPV6)
> +		if (!*end)
> +			return 1;
> +#else
> +		return -1;
> +#endif
> +	}
> +	return -1;
> +}
[...]

The return values for this are awful.  I think the return value should
be 0 for success or -EINVAL on error.

The caller can then check addr->sa.sa_family if they want to know the
address family immediately.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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