[PATCH net v2 1/2] ipv6: constify rt6_nexthop()

[Nicolas Dichtel]

There is no functional change in this patch, it only prepares the next one.

rt6_nexthop() will be used by ip6_dst_lookup_neigh(), which uses const
variables.

Signed-off-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
---
 drivers/net/vrf.c                | 2 +-
 include/net/ip6_route.h          | 4 ++--
 net/bluetooth/6lowpan.c          | 4 ++--
 net/ipv6/ip6_output.c            | 2 +-
 net/netfilter/nf_flow_table_ip.c | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 11b9525dff27..311b0cc6eb98 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -350,8 +350,8 @@ static int vrf_finish_output6(struct net *net, struct sock 
*sk,
 {
        struct dst_entry *dst = skb_dst(skb);
        struct net_device *dev = dst->dev;
+       const struct in6_addr *nexthop;
        struct neighbour *neigh;
-       struct in6_addr *nexthop;
        int ret;
 
        nf_reset(skb);
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 4790beaa86e0..ee7405e759ba 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -262,8 +262,8 @@ static inline bool ip6_sk_ignore_df(const struct sock *sk)
               inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
 }
 
-static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
-                                          struct in6_addr *daddr)
+static inline const struct in6_addr *rt6_nexthop(const struct rt6_info *rt,
+                                                const struct in6_addr *daddr)
 {
        if (rt->rt6i_flags & RTF_GATEWAY)
                return &rt->rt6i_gateway;
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 19d27bee285e..1555b0c6f7ec 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -160,10 +160,10 @@ static inline struct lowpan_peer *peer_lookup_dst(struct 
lowpan_btle_dev *dev,
                                                  struct in6_addr *daddr,
                                                  struct sk_buff *skb)
 {
-       struct lowpan_peer *peer;
-       struct in6_addr *nexthop;
        struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
        int count = atomic_read(&dev->peer_count);
+       const struct in6_addr *nexthop;
+       struct lowpan_peer *peer;
 
        BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
 
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 834475717110..21efcd02f337 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -59,8 +59,8 @@ static int ip6_finish_output2(struct net *net, struct sock 
*sk, struct sk_buff *
 {
        struct dst_entry *dst = skb_dst(skb);
        struct net_device *dev = dst->dev;
+       const struct in6_addr *nexthop;
        struct neighbour *neigh;
-       struct in6_addr *nexthop;
        int ret;
 
        if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 241317473114..cdfc33517e85 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -439,9 +439,9 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
        struct nf_flowtable *flow_table = priv;
        struct flow_offload_tuple tuple = {};
        enum flow_offload_tuple_dir dir;
+       const struct in6_addr *nexthop;
        struct flow_offload *flow;
        struct net_device *outdev;
-       struct in6_addr *nexthop;
        struct ipv6hdr *ip6h;
        struct rt6_info *rt;
 
-- 
2.21.0