Bugfix for iproute2

Bugfix for iproute2

[Sven Anders]

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Hello!

I already send this mail to Stephen Hemminger, but I'm not sure if it reached him.
Moreover I tried to join the LARTC mailing list (http://mailman.ds9a.nl/mailman/listinfo/lartc)
but it did not work. Is this mailing list dead?
Therefore I sent this mail again over this mailing list...


I experienced an error, if I try to perform a

  ip route flush proto 4

with many routes in a complex environment, it
gave me the following error:

  Failed to send flush request: Success
  Flush terminated

I'm using version 2.6.29.
I check GIT, but there was only the "MSG_PEEK" fix.

I tracked it down to the rtnl_send_check() function
in lib/libnetlink.c.

In this function there is the following for loop:

        for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
             h = NLMSG_NEXT(h, status)) {
                if (h->nlmsg_type == NLMSG_ERROR) {
                        struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
                        if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
                                fprintf(stderr, "ERROR truncated\n");
                        else
                                errno = -err->error;
		}
                return -1;
        }

I think the "return -1;" should be inside the if statement.

I attached a patch for this. The first part of the patch is taken from
one of the late git commits.

Please note me, if the fix is wrong...

Regards
 Sven Anders

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--- iproute2-2.6.29/lib/libnetlink.c.orig	2009-09-23 14:47:03.000000000 +0200
+++ iproute2-2.6.29/lib/libnetlink.c	2009-09-23 14:48:09.000000000 +0200
@@ -122,7 +122,7 @@ int rtnl_send_check(struct rtnl_handle *
 		return status;
 
 	/* Check for errors */
-	status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT);
+	status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK);
 	if (status < 0) {
 		if (errno == EAGAIN)
 			return 0;
@@ -137,8 +137,8 @@ int rtnl_send_check(struct rtnl_handle *
 				fprintf(stderr, "ERROR truncated\n");
 			else 
 				errno = -err->error;
-		}
 		return -1;
+		}
 	}
 
 	return 0;


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Re: Bugfix for iproute2

[Stephen Hemminger]

On Tue, 03 Nov 2009 00:45:24 +0100
Sven Anders <anders@anduras.de> wrote:

> Hello!
> 
> I already send this mail to Stephen Hemminger, but I'm not sure if it reached him.
> Moreover I tried to join the LARTC mailing list (http://mailman.ds9a.nl/mailman/listinfo/lartc)
> but it did not work. Is this mailing list dead?
> Therefore I sent this mail again over this mailing list...
> 
> 
> I experienced an error, if I try to perform a
> 
>   ip route flush proto 4
> 
> with many routes in a complex environment, it
> gave me the following error:
> 
>   Failed to send flush request: Success
>   Flush terminated
> 
> I'm using version 2.6.29.
> I check GIT, but there was only the "MSG_PEEK" fix.
> 
> I tracked it down to the rtnl_send_check() function
> in lib/libnetlink.c.
> 
> In this function there is the following for loop:
> 
>         for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
>              h = NLMSG_NEXT(h, status)) {
>                 if (h->nlmsg_type == NLMSG_ERROR) {
>                         struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
>                         if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
>                                 fprintf(stderr, "ERROR truncated\n");
>                         else
>                                 errno = -err->error;
> 		}
>                 return -1;
>         }
> 
> I think the "return -1;" should be inside the if statement.
> 
> I attached a patch for this. The first part of the patch is taken from
> one of the late git commits.
> 
> Please note me, if the fix is wrong...
> 
> Regards
>  Sven Anders
> 

Applied thanks.

--