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[RFC,10/14] config: clamp ra_hoplimit to maximum (instead of complaining)

Message ID 20240509223213.97389-11-newtwen+github@gmail.com
State Changes Requested
Delegated to: Ansuel Smith
Headers show
Series odhcpd config value clamping | expand

Commit Message

Paul Donald May 9, 2024, 10:30 p.m. UTC 
From: Paul Donald <newtwen@gmail.com>

Attempt to be helpful.

Signed-off-by: Paul Donald <newtwen@gmail.com>
---
 src/config.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Comments

Christian Marangi Nov. 16, 2024, 3:14 p.m. UTC | #1 
On Fri, May 10, 2024 at 12:30:42AM +0200, Paul Donald wrote:
> From: Paul Donald <newtwen@gmail.com>
> 
> Attempt to be helpful.
> 
> Signed-off-by: Paul Donald <newtwen@gmail.com>
> ---
>  src/config.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/src/config.c b/src/config.c
> index 54fb9b5..e0f2d80 100644
> --- a/src/config.c
> +++ b/src/config.c
> @@ -961,11 +961,12 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
>  	if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
>  		uint32_t ra_hoplimit = blobmsg_get_u32(c);
>  
> -		if (ra_hoplimit <= 255)
> -			iface->ra_hoplimit = ra_hoplimit;
> -		else
> -			syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
> -					iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name);
> +		/* rfc4861#section-6.2.1 : AdvCurHopLimit */
> +		iface->ra_hoplimit = (ra_hoplimit <= 255)? ra_hoplimit : 255;
> +		if(ra_hoplimit > 255)
> +			syslog(LOG_INFO, "Clamped invalid %s value configured for interface '%s' to %d",
> +					iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name, iface->ra_hoplimit);
> +

Same comments as prev patch.

>  	}
>  
>  	if ((c = tb[IFACE_ATTR_RA_MTU])) {
> -- 
> 2.44.0
> 
> 
> _______________________________________________
> openwrt-devel mailing list
> openwrt-devel@lists.openwrt.org
> https://lists.openwrt.org/mailman/listinfo/openwrt-devel
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Patch

diff --git a/src/config.c b/src/config.c
index 54fb9b5..e0f2d80 100644
--- a/src/config.c
+++ b/src/config.c
@@ -961,11 +961,12 @@  int config_parse_interface(void *data, size_t len, const char *name, bool overwr
 	if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 		uint32_t ra_hoplimit = blobmsg_get_u32(c);
 
-		if (ra_hoplimit <= 255)
-			iface->ra_hoplimit = ra_hoplimit;
-		else
-			syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
-					iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name);
+		/* rfc4861#section-6.2.1 : AdvCurHopLimit */
+		iface->ra_hoplimit = (ra_hoplimit <= 255)? ra_hoplimit : 255;
+		if(ra_hoplimit > 255)
+			syslog(LOG_INFO, "Clamped invalid %s value configured for interface '%s' to %d",
+					iface_attrs[IFACE_ATTR_RA_HOPLIMIT].name, iface->name, iface->ra_hoplimit);
+
 	}
 
 	if ((c = tb[IFACE_ATTR_RA_MTU])) {