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net: ipv6: 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 10:42:40 -07:00 committed by David S. Miller
parent b61798130f
commit 18c3a61c42
1 changed files with 26 additions and 8 deletions
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34
net/ipv6/route.c
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@ -3607,11 +3607,13 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[RTA_MAX+1];
int err, iif = 0, oif = 0;
struct dst_entry *dst;
struct rt6_info *rt;
struct sk_buff *skb;
struct rtmsg *rtm;
struct flowi6 fl6;
int err, iif = 0, oif = 0;
bool fibmatch;
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
extack);
@ -3622,6 +3624,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
memset(&fl6, 0, sizeof(fl6));
rtm = nlmsg_data(nlh);
fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
if (tb[RTA_SRC]) {
if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
@ -3667,12 +3670,23 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
if (!ipv6_addr_any(&fl6.saddr))
flags |= RT6_LOOKUP_F_HAS_SADDR;
rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
flags);
if (!fibmatch)
dst = ip6_route_input_lookup(net, dev, &fl6, flags);
} else {
fl6.flowi6_oif = oif;
rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
if (!fibmatch)
dst = ip6_route_output(net, NULL, &fl6);
}
if (fibmatch)
dst = ip6_route_lookup(net, &fl6, 0);
rt = container_of(dst, struct rt6_info, dst);
if (rt->dst.error) {
err = rt->dst.error;
ip6_rt_put(rt);
goto errout;
}
if (rt == net->ipv6.ip6_null_entry) {
@ -3689,10 +3703,14 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
}
skb_dst_set(skb, &rt->dst);
err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0);
if (fibmatch)
err = rt6_fill_node(net, skb, rt, NULL, NULL, iif,
RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0);
else
err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0);
if (err < 0) {
kfree_skb(skb);
goto errout;