[PATCH net] net: ipv6: Compare lwstate in detecting duplicate nexthops

[David Ahern]

Lennert reported a failure to add different mpls encaps in a multipath
route:

  $ ip -6 route add 1234::/16 \
        nexthop encap mpls 10 via fe80::1 dev ens3 \
        nexthop encap mpls 20 via fe80::1 dev ens3
  RTNETLINK answers: File exists

The problem is that the duplicate nexthop detection does not compare
lwtunnel configuration. Add it.

Fixes: 19e42e451506("ipv6: support for fib route lwtunnel encap attributes")
Signed-off-by: David Ahern <dsah...@gmail.com>
---
 include/net/ip6_route.h | 8 ++++++++
 net/ipv6/ip6_fib.c      | 5 +----
 net/ipv6/route.c        | 8 +-------
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index f5e625f53367..4341731f39a5 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -22,6 +22,7 @@ struct route_info {
 #include <net/flow.h>
 #include <net/ip6_fib.h>
 #include <net/sock.h>
+#include <net/lwtunnel.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 #include <linux/route.h>
@@ -233,4 +234,11 @@ static inline struct in6_addr *rt6_nexthop(struct rt6_info 
*rt,
                return daddr;
 }
 
+static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info 
*b)
+{
+       return a->dst.dev == b->dst.dev &&
+              a->rt6i_idev == b->rt6i_idev &&
+              ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
+              !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
+}
 #endif
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index e6b78ba0e636..e4e9f752ebbf 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -784,10 +784,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct 
rt6_info *rt,
                                goto next_iter;
                        }
 
-                       if (iter->dst.dev == rt->dst.dev &&
-                           iter->rt6i_idev == rt->rt6i_idev &&
-                           ipv6_addr_equal(&iter->rt6i_gateway,
-                                           &rt->rt6i_gateway)) {
+                       if (rt6_duplicate_nexthop(iter, rt)) {
                                if (rt->rt6i_nsiblings)
                                        rt->rt6i_nsiblings = 0;
                                if (!(iter->rt6i_flags & RTF_EXPIRES))
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 322bd62e688b..bc49f9a82994 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3048,17 +3048,11 @@ static int ip6_route_info_append(struct list_head 
*rt6_nh_list,
                                 struct rt6_info *rt, struct fib6_config *r_cfg)
 {
        struct rt6_nh *nh;
-       struct rt6_info *rtnh;
        int err = -EEXIST;
 
        list_for_each_entry(nh, rt6_nh_list, next) {
                /* check if rt6_info already exists */
-               rtnh = nh->rt6_info;
-
-               if (rtnh->dst.dev == rt->dst.dev &&
-                   rtnh->rt6i_idev == rt->rt6i_idev &&
-                   ipv6_addr_equal(&rtnh->rt6i_gateway,
-                                   &rt->rt6i_gateway))
+               if (rt6_duplicate_nexthop(nh->rt6_info, rt))
                        return err;
        }
 
-- 
2.11.0 (Apple Git-81)