netdev - [PATCH iproute2-next 05/12] ip route: Add protocol, table id and device to dump request

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Date:   Wed, 19 Dec 2018 19:54:20 -0800
From:   David Ahern <dsahern@...nel.org>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, David Ahern <dsahern@...il.com>
Subject: [PATCH iproute2-next 05/12] ip route: Add protocol, table id and device to dump request

From: David Ahern <dsahern@...il.com>

Add protocol, table id and device to dump request if set in filter. If
kernel side filtering is supported it is used to reduce the amount of
data sent to userspace.

Older kernels do not parse attributes on a route dump request, so these
are silently ignored and ip will do the filtering in userspace.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 ip/iproute.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/ip/iproute.c b/ip/iproute.c
index 3c0be0a96d4e..5bffb9d88b58 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -1669,10 +1669,24 @@ static int iproute_flush(int do_ipv6, rtnl_filter_t filter_fn)
 static int iproute_dump_filter(struct nlmsghdr *nlh, int reqlen)
 {
 	struct rtmsg *rtm = NLMSG_DATA(nlh);
+	int err;
 
+	rtm->rtm_protocol = filter.protocol;
 	if (filter.cloned)
 		rtm->rtm_flags |= RTM_F_CLONED;
 
+	if (filter.tb) {
+		err = addattr32(nlh, reqlen, RTA_TABLE, filter.tb);
+		if (err)
+			return err;
+	}
+
+	if (filter.oif) {
+		err = addattr32(nlh, reqlen, RTA_OIF, filter.oif);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }
 
-- 
2.11.0