From f06b7549b79e29a672336d4e134524373fb7a232 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 5 Jul 2017 14:41:46 -0600 Subject: [PATCH] net: ipv6: Compare lwstate in detecting duplicate nexthops MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reported-by: João Taveira Araújo Reported-by: Lennert Buytenhek Acked-by: Roopa Prabhu Tested-by: Lennert Buytenhek Signed-off-by: David S. Miller --- 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 0fbf73dd531a..199056933dcb 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -22,6 +22,7 @@ struct route_info { #include #include #include +#include #include #include #include @@ -232,4 +233,11 @@ 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 5477ba729c36..ebb299cf72b7 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -786,10 +786,7 @@ 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 0488a24c2a44..4d30c96a819d 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3036,17 +3036,11 @@ 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; } -- 2.20.1