From 710ec5622306de8c071637ee41ddf4c9bd17e75a Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Thu, 11 Mar 2021 19:03:15 +0100 Subject: nexthop: Add netlink defines and enumerators for resilient NH groups - RTM_NEWNEXTHOP et.al. that handle resilient groups will have a new nested attribute, NHA_RES_GROUP, whose elements are attributes NHA_RES_GROUP_*. - RTM_NEWNEXTHOPBUCKET et.al. is a suite of new messages that will currently serve only for dumping of individual buckets of resilient next hop groups. For nexthop group buckets, these messages will carry a nested attribute NHA_RES_BUCKET, whose elements are attributes NHA_RES_BUCKET_*. There are several reasons why a new suite of messages is created for nexthop buckets instead of overloading the information on the existing RTM_{NEW,DEL,GET}NEXTHOP messages. First, a nexthop group can contain a large number of nexthop buckets (4k is not unheard of). This imposes limits on the amount of information that can be encoded for each nexthop bucket given a netlink message is limited to 64k bytes. Second, while RTM_NEWNEXTHOPBUCKET is only used for notifications at this point, in the future it can be extended to provide user space with control over nexthop buckets configuration. - The new group type is NEXTHOP_GRP_TYPE_RES. Note that nexthop code is adjusted to bounce groups with that type for now. Signed-off-by: Ido Schimmel Reviewed-by: Petr Machata Reviewed-by: David Ahern Signed-off-by: Petr Machata Signed-off-by: David S. Miller --- net/ipv4/nexthop.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net/ipv4/nexthop.c') diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c index 56c54d0fbacc..7a94591da856 100644 --- a/net/ipv4/nexthop.c +++ b/net/ipv4/nexthop.c @@ -1492,6 +1492,8 @@ static struct nexthop *nexthop_create_group(struct net *net, if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_MPATH) { nhg->mpath = 1; nhg->is_multipath = true; + } else if (cfg->nh_grp_type == NEXTHOP_GRP_TYPE_RES) { + goto out_no_nh; } WARN_ON_ONCE(nhg->mpath != 1); -- cgit v1.2.3