From 08e814c9e8eb5a982cbd1e8f6bd255d97c51026f Mon Sep 17 00:00:00 2001 From: David Ahern Date: Mon, 15 Oct 2018 18:56:50 -0700 Subject: [PATCH] net/ipv6: Bail early if user only wants cloned entries Similar to IPv4, IPv6 fib no longer contains cloned routes. If a user requests a route dump for only cloned entries, no sense walking the FIB and returning everything. Signed-off-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/ip6_fib.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 5562c77022c6..2a058b408a6a 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -586,10 +586,13 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { struct rtmsg *rtm = nlmsg_data(nlh); - if (rtm->rtm_flags & RTM_F_PREFIX) - arg.filter.flags = RTM_F_PREFIX; + arg.filter.flags = rtm->rtm_flags & (RTM_F_PREFIX|RTM_F_CLONED); } + /* fib entries are never clones */ + if (arg.filter.flags & RTM_F_CLONED) + return skb->len; + w = (void *)cb->args[2]; if (!w) { /* New dump: