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net: ipv4: RTM_GETROUTE: return matched fib result when requested

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This patch adds support to return matched fib result when RTM_F_FIB_MATCH
flag is specified in RTM_GETROUTE request. This is useful for user-space
applications/controllers wanting to query a matching route.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2017-05-25 10:42:39 -07:00 committed by David S. Miller
parent 0be1b305d9
commit b61798130f
1 changed files with 11 additions and 2 deletions
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13
net/ipv4/route.c
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@ -114,6 +114,8 @@
#include <net/ip_tunnels.h>
#include <net/l3mdev.h>
#include "fib_lookup.h"
#define RT_FL_TOS(oldflp4) \
((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
@ -2746,8 +2748,15 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE)
table_id = rt->rt_table_id;
err = rt_fill_info(net, dst, src, table_id, &fl4, skb,
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, rt);
if (rtm->rtm_flags & RTM_F_FIB_MATCH)
err = fib_dump_info(skb, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWROUTE, table_id,
rt->rt_type, res.prefix, res.prefixlen,
fl4.flowi4_tos, res.fi, 0);
else
err = rt_fill_info(net, dst, src, table_id, &fl4, skb,
NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
rt);
if (err < 0)
goto errout_free;