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authorDavid Ahern <dsa@cumulusnetworks.com>2017-03-06 15:57:31 -0800
committerDavid S. Miller <davem@davemloft.net>2017-03-09 13:04:48 -0800
commit5be083cedc087b2d457ef2e9c2d5698c94d3d5e4 (patch)
tree229cc3fef63f1be681fb151a72a912869163fbb8 /net/ipv6
parent713c43b315fc160dc4ff3da0020ebe09b8a65587 (diff)
downloadop-kernel-dev-5be083cedc087b2d457ef2e9c2d5698c94d3d5e4.zip
op-kernel-dev-5be083cedc087b2d457ef2e9c2d5698c94d3d5e4.tar.gz
net: ipv6: Remove redundant RTA_OIF in multipath routes
Dinesh reported that RTA_MULTIPATH nexthops are 8-bytes larger with IPv6 than IPv4. The recent refactoring for multipath support in netlink messages does discriminate between non-multipath which needs the OIF and multipath which adds a rtnexthop struct for each hop making the RTA_OIF attribute redundant. Resolve by adding a flag to the info function to skip the oif for multipath. Fixes: beb1afac518d ("net: ipv6: Add support to dump multipath routes via RTA_MULTIPATH attribute") Reported-by: Dinesh Dutt <ddutt@cumulusnetworks.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/route.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 229bfcc..35c58b6 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3299,7 +3299,6 @@ static size_t rt6_nlmsg_size(struct rt6_info *rt)
nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
+ NLA_ALIGN(sizeof(struct rtnexthop))
+ nla_total_size(16) /* RTA_GATEWAY */
- + nla_total_size(4) /* RTA_OIF */
+ lwtunnel_get_encap_size(rt->dst.lwtstate);
nexthop_len *= rt->rt6i_nsiblings;
@@ -3323,7 +3322,7 @@ static size_t rt6_nlmsg_size(struct rt6_info *rt)
}
static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
- unsigned int *flags)
+ unsigned int *flags, bool skip_oif)
{
if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
*flags |= RTNH_F_LINKDOWN;
@@ -3336,7 +3335,8 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
goto nla_put_failure;
}
- if (rt->dst.dev &&
+ /* not needed for multipath encoding b/c it has a rtnexthop struct */
+ if (!skip_oif && rt->dst.dev &&
nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
goto nla_put_failure;
@@ -3350,6 +3350,7 @@ nla_put_failure:
return -EMSGSIZE;
}
+/* add multipath next hop */
static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
{
struct rtnexthop *rtnh;
@@ -3362,7 +3363,7 @@ static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
rtnh->rtnh_hops = 0;
rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
- if (rt6_nexthop_info(skb, rt, &flags) < 0)
+ if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
goto nla_put_failure;
rtnh->rtnh_flags = flags;
@@ -3515,7 +3516,7 @@ static int rt6_fill_node(struct net *net,
nla_nest_end(skb, mp);
} else {
- if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags) < 0)
+ if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
goto nla_put_failure;
}
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