[net-next] seg6: allow local packet processing for SRv6 End.DT6 behavior

[Andrea Mayer]

End.DT6 behavior makes use of seg6_lookup_nexthop() function which drops
all packets that are destined to be locally processed. However, DT* should
be able to delivery decapsulated packets that are destined to local
addresses. Function seg6_lookup_nexthop() is also used by DX6, so in order
to maintain compatibility I created another routing helper function which
is called seg6_lookup_any_nexthop(). This function is able to take into
account both packets that have to be processed locally and the ones that
are destined to be forwarded directly to another machine. Hence,
seg6_lookup_any_nexthop() is used in DT6 rather than seg6_lookup_nexthop()
to allow local delivery.

Signed-off-by: Andrea Mayer <andrea.mayer@xxxxxxxxxxx>
---
 net/ipv6/seg6_local.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index e70567446f28..43f3c9f1b4c1 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -149,8 +149,9 @@ static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
 	*daddr = *addr;
 }
 
-int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
-			u32 tbl_id)
+static int
+seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
+			u32 tbl_id, int local_delivery)
 {
 	struct net *net = dev_net(skb->dev);
 	struct ipv6hdr *hdr = ipv6_hdr(skb);
@@ -158,6 +159,7 @@ int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
 	struct dst_entry *dst = NULL;
 	struct rt6_info *rt;
 	struct flowi6 fl6;
+	int dev_flags = 0;
 
 	fl6.flowi6_iif = skb->dev->ifindex;
 	fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
@@ -182,7 +184,13 @@ int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
 		dst = &rt->dst;
 	}
 
-	if (dst && dst->dev->flags & IFF_LOOPBACK && !dst->error) {
+	/* we want to discard traffic destined for local packet processing,
+	 * if @local_delivery is set to false.
+	 */
+	if (!local_delivery)
+		dev_flags |= IFF_LOOPBACK;
+
+	if (dst && (dst->dev->flags & dev_flags) && !dst->error) {
 		dst_release(dst);
 		dst = NULL;
 	}
@@ -199,6 +207,12 @@ int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
 	return dst->error;
 }
 
+inline int seg6_lookup_nexthop(struct sk_buff *skb,
+			       struct in6_addr *nhaddr, u32 tbl_id)
+{
+	return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false);
+}
+
 /* regular endpoint function */
 static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
 {
@@ -396,7 +410,7 @@ static int input_action_end_dt6(struct sk_buff *skb,
 
 	skb_set_transport_header(skb, sizeof(struct ipv6hdr));
 
-	seg6_lookup_nexthop(skb, NULL, slwt->table);
+	seg6_lookup_any_nexthop(skb, NULL, slwt->table, true);
 
 	return dst_input(skb);
 
-- 
2.20.1