From: David Ahern <dsah...@gmail.com>

Convert decnet neighbor table to per-namespace. Since there are no
other per-namespace parameters for decnet just add the reference to
struct net directly.

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 include/net/net_namespace.h |  3 +++
 net/core/neighbour.c        | 26 ++++++++++----------------
 2 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index a71264d75d7f..77799ed7212e 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -108,6 +108,9 @@ struct net {
 #if IS_ENABLED(CONFIG_IPV6)
        struct netns_ipv6       ipv6;
 #endif
+#if IS_ENABLED(CONFIG_DECNET)
+       struct neigh_table      *dn_tbl;
+#endif
 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
        struct netns_ieee802154_lowpan  ieee802154_lowpan;
 #endif
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 35c41c4876e5..1bb7fa14cb62 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1485,15 +1485,11 @@ EXPORT_SYMBOL(pneigh_enqueue);
 static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,
                                                      struct net *net, int 
ifindex)
 {
-       struct net *def_net = &init_net;
        struct neigh_parms *p;
 
-       if (tbl->family != AF_DECnet)
-               def_net = neigh_parms_net(p);
-
        list_for_each_entry(p, &tbl->parms_list, list) {
                if ((p->dev && p->dev->ifindex == ifindex && 
net_eq(neigh_parms_net(p), net)) ||
-                   (!p->dev && !ifindex && net_eq(net, def_net)))
+                   (!p->dev && !ifindex))
                        return p;
        }
 
@@ -1622,9 +1618,11 @@ void neigh_table_init(struct net *net, struct 
neigh_table *tbl)
                net->ipv6.nd_tbl = tbl;
                break;
 #endif
+#if IS_ENABLED(CONFIG_DECNET)
        case AF_DECnet:
-               neigh_tables[NEIGH_DN_TABLE] = tbl;
+               net->dn_tbl = tbl;
                break;
+#endif
        }
 }
 EXPORT_SYMBOL(neigh_table_init);
@@ -1642,9 +1640,11 @@ int neigh_table_clear(struct net *net, struct 
neigh_table *tbl)
                net->ipv6.nd_tbl = NULL;
                break;
 #endif
+#if IS_ENABLED(CONFIG_DECNET)
        case AF_DECnet:
-               neigh_tables[NEIGH_DN_TABLE] = NULL;
+               net->dn_tbl = NULL;
                break;
+#endif
        }
 
        /* It is not clean... Fix it to unload IPv6 module safely */
@@ -1684,9 +1684,11 @@ struct neigh_table *neigh_find_table(struct net *net, u8 
family)
                tbl = net->ipv6.nd_tbl;
                break;
 #endif
+#if IS_ENABLED(CONFIG_DECNET)
        case AF_DECnet:
-               tbl = neigh_tables[NEIGH_DN_TABLE];
+               tbl = net->dn_tbl;
                break;
+#endif
        }
 
        return tbl;
@@ -2182,14 +2184,6 @@ static int neightbl_set(struct sk_buff *skb, struct 
nlmsghdr *nlh,
                }
        }
 
-       err = -ENOENT;
-       if (tbl->family == AF_DECnet) {
-               if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] ||
-                    tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) &&
-                   !net_eq(net, &init_net))
-                       goto errout_tbl_lock;
-       }
-
        if (tb[NDTA_THRESH1])
                tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]);
 
-- 
2.11.0

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