netdev - Re: [patch iproute2-next v2 1/2] ip: add support for alternative name addition/deletion/list

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Date:   Mon, 7 Oct 2019 15:37:21 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, jakub.kicinski@...ronome.com,
        roopa@...ulusnetworks.com, dcbw@...hat.com,
        nikolay@...ulusnetworks.com, mkubecek@...e.cz, andrew@...n.ch,
        parav@...lanox.com, saeedm@...lanox.com, f.fainelli@...il.com,
        stephen@...workplumber.org, sd@...asysnail.net, sbrivio@...hat.com,
        pabeni@...hat.com, mlxsw@...lanox.com
Subject: Re: [patch iproute2-next v2 1/2] ip: add support for alternative name
 addition/deletion/list

On 10/2/19 4:56 AM, Jiri Pirko wrote:
> diff --git a/ip/iplink.c b/ip/iplink.c
> index 212a088535da..e3f8a28fe94c 100644
> --- a/ip/iplink.c
> +++ b/ip/iplink.c
> @@ -111,7 +111,9 @@ void iplink_usage(void)
>  		"\n"
>  		"	ip link xstats type TYPE [ ARGS ]\n"
>  		"\n"
> -		"	ip link afstats [ dev DEVICE ]\n");
> +		"	ip link afstats [ dev DEVICE ]\n"
> +		"	ip link prop add dev DEVICE [ altname NAME .. ]\n"
> +		"	ip link prop del dev DEVICE [ altname NAME .. ]\n");

spell out 'property' here. The matches below on "prop" is fine, but the
help can show the full name.


> +
> +	if (matches(*argv, "add") == 0) {
> +		req.n.nlmsg_flags |= NLM_F_EXCL | NLM_F_CREATE | NLM_F_APPEND;
> +		req.n.nlmsg_type = RTM_NEWLINKPROP;
> +	} else if (matches(*argv, "del") == 0) {
> +		req.n.nlmsg_flags |= RTM_DELLINK;

RTM_DELLINK is a command not a netlink flag.


> +		req.n.nlmsg_type = RTM_DELLINKPROP;
> +	} else if (matches(*argv, "help") == 0) {
> +		usage();
> +	} else {
> +		fprintf(stderr, "Operator required\n");
> +		exit(-1);
> +	}
> +	return iplink_prop_mod(argc - 1, argv + 1, &req);
> +}
> +
>  static void do_help(int argc, char **argv)
>  {
>  	struct link_util *lu = NULL;
>

> diff --git a/lib/utils.c b/lib/utils.c
> index 95d46ff210aa..bbb3bdcfa80b 100644
> --- a/lib/utils.c
> +++ b/lib/utils.c
> @@ -824,14 +824,10 @@ int nodev(const char *dev)
>  	return -1;
>  }
>  
> -int check_ifname(const char *name)
> +static int __check_ifname(const char *name)
>  {
> -	/* These checks mimic kernel checks in dev_valid_name */
>  	if (*name == '\0')
>  		return -1;
> -	if (strlen(name) >= IFNAMSIZ)
> -		return -1;
> -
>  	while (*name) {
>  		if (*name == '/' || isspace(*name))
>  			return -1;
> @@ -840,6 +836,19 @@ int check_ifname(const char *name)
>  	return 0;
>  }
>  
> +int check_ifname(const char *name)
> +{
> +	/* These checks mimic kernel checks in dev_valid_name */
> +	if (strlen(name) >= IFNAMSIZ)
> +		return -1;
> +	return __check_ifname(name);
> +}
> +
> +int check_altifname(const char *name)
> +{
> +	return __check_ifname(name);
> +}
> +
>  /* buf is assumed to be IFNAMSIZ */
>  int get_ifname(char *buf, const char *name)
>  {
> diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
> index a8ae72d2b097..7cb4d56726d8 100644
> --- a/man/man8/ip-link.8.in
> +++ b/man/man8/ip-link.8.in
> @@ -244,6 +244,17 @@ ip-link \- network device configuration
>  .IR VLAN-QOS " ] ["
>  .B proto
>  .IR VLAN-PROTO " ] ]"
> +.in -8
> +
> +.ti -8
> +.BI "ip link prop add"
> +.RB "[ " altname
> +.IR NAME " .. ]"
> +
> +.ti -8
> +.BI "ip link prop del"
> +.RB "[ " altname
> +.IR NAME " .. ]"
>  
>  .SH "DESCRIPTION"
>  .SS ip link add - add virtual link
>