[PATCH v3 net-next 14/15] neighbour: Remove unnecessary net_eq().

[Kuniyuki Iwashima <kuniyu@google.com>]

neigh_table is now per-netns, and net_eq() is no longer needed.

Let's remove them.

As a bonus, each netns can configure the default table param
(ifindex==0) and GC parameters via RTM_SETNEIGHTBL.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
v2: Split pneigh part into the prev patch
---
 net/core/neighbour.c | 32 +++++++++-----------------------
 1 file changed, 9 insertions(+), 23 deletions(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 9cb8e68246a8..07c62268fc3b 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1746,13 +1746,13 @@ void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
 }
 
 static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,
-						      struct net *net, int ifindex)
+						     int ifindex)
 {
 	struct neigh_parms *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, &init_net)))
+		if ((p->dev && p->dev->ifindex == ifindex) ||
+		    (!p->dev && !ifindex))
 			return p;
 	}
 
@@ -2475,8 +2475,8 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh,
 		if (tbp[NDTPA_IFINDEX])
 			ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]);
 
-		p = lookup_neigh_parms(tbl, net, ifindex);
-		if (p == NULL) {
+		p = lookup_neigh_parms(tbl, ifindex);
+		if (!p) {
 			err = -ENOENT;
 			goto errout_tbl_lock;
 		}
@@ -2557,12 +2557,6 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh,
 		}
 	}
 
-	err = -ENOENT;
-	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])
 		WRITE_ONCE(tbl->gc_thresh1, nla_get_u32(tb[NDTA_THRESH1]));
 
@@ -2645,9 +2639,6 @@ static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
 		nidx = 0;
 		p = list_next_entry(&tbl->parms, list);
 		list_for_each_entry_from_rcu(p, &tbl->parms_list, list) {
-			if (!net_eq(neigh_parms_net(p), net))
-				continue;
-
 			if (nidx < neigh_skip)
 				goto next;
 
@@ -2825,12 +2816,11 @@ static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
 			    struct netlink_callback *cb,
 			    struct neigh_dump_filter *filter)
 {
-	struct net *net = sock_net(skb->sk);
-	struct neighbour *n;
-	int err = 0, h, s_h = cb->args[1];
 	int idx, s_idx = idx = cb->args[2];
-	struct neigh_hash_table *nht;
+	int err = 0, h, s_h = cb->args[1];
 	unsigned int flags = NLM_F_MULTI;
+	struct neigh_hash_table *nht;
+	struct neighbour *n;
 
 	if (filter->dev_idx || filter->master_idx)
 		flags |= NLM_F_DUMP_FILTERED;
@@ -2842,7 +2832,7 @@ static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
 			s_idx = 0;
 		idx = 0;
 		neigh_for_each_in_bucket_rcu(n, &nht->hash_heads[h]) {
-			if (idx < s_idx || !net_eq(dev_net(n->dev), net))
+			if (idx < s_idx)
 				goto next;
 			if (neigh_ifindex_filtered(n->dev, filter->dev_idx) ||
 			    neigh_master_filtered(n->dev, filter->master_idx))
@@ -3247,10 +3237,6 @@ static struct neighbour *neigh_get_valid(struct seq_file *seq,
 					 loff_t *pos)
 {
 	struct neigh_seq_state *state = seq->private;
-	struct net *net = seq_file_net(seq);
-
-	if (!net_eq(dev_net(n->dev), net))
-		return NULL;
 
 	if (state->neigh_sub_iter) {
 		loff_t fakep = 0;
-- 
2.55.0.691.gc56d675ccc-goog