netdev - Re: [PATCH main 1/1] macsec: Fix Macsec replay protection

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Date:   Tue, 10 Jan 2023 11:02:03 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     ehakim@...dia.com
Cc:     dsahern@...nel.org, netdev@...r.kernel.org,
        Raed Salem <raeds@...dia.com>
Subject: Re: [PATCH main 1/1] macsec: Fix Macsec replay protection

2023-01-10, 10:02:19 +0200, ehakim@...dia.com wrote:
> @@ -1516,7 +1515,7 @@ static int macsec_parse_opt(struct link_util *lu, int argc, char **argv,
>  		addattr_l(n, MACSEC_BUFLEN, IFLA_MACSEC_ICV_LEN,
>  			  &cipher.icv_len, sizeof(cipher.icv_len));
>  
> -	if (replay_protect != -1) {
> +	if (replay_protect) {

This will silently break disabling replay protection on an existing
device. This:

    ip link set macsec0 type macsec replay off

would now appear to succeed but will not do anything. That's why I
used an int with -1 in iproute, and a U8 netlink attribute rather a
flag.

I think this would be a better fix:

 	if (replay_protect != -1) {
-		addattr32(n, MACSEC_BUFLEN, IFLA_MACSEC_WINDOW, window);
+		if (replay_protect)
+			addattr32(n, MACSEC_BUFLEN, IFLA_MACSEC_WINDOW, window);
 		addattr8(n, MACSEC_BUFLEN, IFLA_MACSEC_REPLAY_PROTECT,
 			 replay_protect);
 	}

Does that work for all your test cases?


>  		addattr32(n, MACSEC_BUFLEN, IFLA_MACSEC_WINDOW, window);
>  		addattr8(n, MACSEC_BUFLEN, IFLA_MACSEC_REPLAY_PROTECT,
>  			 replay_protect);

-- 
Sabrina