netdev - Re: [PATCH] ip link get dev if%u" now works

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Date:   Wed, 9 Jun 2021 17:07:50 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Марк Коренберг 
        <socketpair@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] ip link get dev if%u" now works

> commit c71a164fb3abbce177cb2692e25ebc54e0156d5a (refs/remotes/origin/getindex)
> Author: Коренберг ☢️  Марк <mark@...co.ru>
> Date:   Thu May 13 15:43:14 2021 +0500
> 
>     ip: "ip link get dev if%u" now works

Patch is missing Signed-off-by

> 
> diff --git a/ip/ip_common.h b/ip/ip_common.h
> index 9a31e837..1eb40a1e 100644
> --- a/ip/ip_common.h
> +++ b/ip/ip_common.h
> @@ -89,7 +89,7 @@ int do_seg6(int argc, char **argv);
>  int do_ipnh(int argc, char **argv);
>  int do_mptcp(int argc, char **argv);
>  
> -int iplink_get(char *name, __u32 filt_mask);
> +int iplink_get(unsigned ifindex, __u32 filt_mask);

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
#94: FILE: ip/ip_common.h:92:
+int iplink_get(unsigned ifindex, __u32 filt_mask);

>  int iplink_ifla_xstats(int argc, char **argv);
>  
>  int ip_link_list(req_filter_fn_t filter_fn, struct nlmsg_chain *linfo);
> diff --git a/ip/ipaddress.c b/ip/ipaddress.c
> index 0bbcee2b..9be6ea4d 100644
> --- a/ip/ipaddress.c
> +++ b/ip/ipaddress.c
> @@ -10,6 +10,7 @@
>   *
>   */
>  
> +#include <assert.h>
>  #include <stdio.h>
>  #include <stdlib.h>
>  #include <unistd.h>
> @@ -2111,7 +2112,8 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
>  	 * the link device
>  	 */
>  	if (filter_dev && filter.group == -1 && do_link == 1) {
> -		if (iplink_get(filter_dev, RTEXT_FILTER_VF) < 0) {
> +		assert(filter.ifindex);

No assert() please do more complete error message and handling.

> +		if (iplink_get(filter.ifindex, RTEXT_FILTER_VF) < 0) {
>  			perror("Cannot send link get request");
>  			delete_json_obj();
>  			exit(1);
> diff --git a/ip/iplink.c b/ip/iplink.c
> index 27c9be44..43272c6b 100644
> --- a/ip/iplink.c
> +++ b/ip/iplink.c
> @@ -1101,21 +1101,17 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
>  	return 0;
>  }
>  
> -int iplink_get(char *name, __u32 filt_mask)
> +int iplink_get(unsigned ifindex, __u32 filt_mask)
>  {
>  	struct iplink_req req = {
>  		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
>  		.n.nlmsg_flags = NLM_F_REQUEST,
>  		.n.nlmsg_type = RTM_GETLINK,
>  		.i.ifi_family = preferred_family,
> +		.i.ifi_index = ifindex,
>  	};
>  	struct nlmsghdr *answer;
>  
> -	if (name) {
> -		addattr_l(&req.n, sizeof(req),
> -			  !check_ifname(name) ? IFLA_IFNAME : IFLA_ALT_IFNAME,
> -			  name, strlen(name) + 1);
> -	}

The old code supported matching by alter name, it looks like with your
change it no longer does.

>  	addattr32(&req.n, sizeof(req), IFLA_EXT_MASK, filt_mask);
>  
>  	if (rtnl_talk(&rth, &req.n, &answer) < 0)