Hello,
On Sun, 3 Apr 2016, David Ahern wrote:
> --- a/Documentation/networking/ip-sysctl.txt
> +++ b/Documentation/networking/ip-sysctl.txt
> @@ -63,6 +63,16 @@ fwmark_reflect - BOOLEAN
> fwmark of the packet they are replying to.
> Default: 0
>
> +fib_multipath_use_neigh - BOOLEAN
> + Use status of existing neighbor entry when determining nexthop for
> + multipath routes. If disabled neighbor information is not used and
Comma from v3 is removed?
> + packets could be directed to a failed nexthop. Only valid for kernels
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> void fib_select_multipath(struct fib_result *res, int hash)
> {
> struct fib_info *fi = res->fi;
> + struct net *net = fi->fib_net;
> + bool first = false;
>
> for_nexthops(fi) {
> if (hash > atomic_read(&nh->nh_upper_bound))
> continue;
>
> - res->nh_sel = nhsel;
> - return;
> + if (!net->ipv4.sysctl_fib_multipath_use_neigh ||
> + fib_good_nh(nh)) {
> + res->nh_sel = nhsel;
> + return;
> + }
> + if (!first) {
> + res->nh_sel = nhsel;
> + first = true;
> + }
> } endfor_nexthops(fi);
>
> /* Race condition: route has just become dead. */
The 'res->nh_sel = 0;' that is here should be
removed because it invalidates the above assignment.
Regards
--
Julian Anastasov <[email protected]>
