netns xfrm: per-netns xfrm_policy_byidx hash

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 10 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index aabc7f28e9c0..700cdd7564e4 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -329,7 +329,6 @@ struct xfrm_policy_hash {
 
 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
-static struct hlist_head *xfrm_policy_byidx __read_mostly;
 static unsigned int xfrm_idx_hmask __read_mostly;
 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
 
@@ -438,7 +437,7 @@ static void xfrm_byidx_resize(int total)
         unsigned int hmask = xfrm_idx_hmask;
         unsigned int nhashmask = xfrm_new_hash_mask(hmask);
         unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
-        struct hlist_head *oidx = xfrm_policy_byidx;
+        struct hlist_head *oidx = init_net.xfrm.policy_byidx;
         struct hlist_head *nidx = xfrm_hash_alloc(nsize);
         int i;
 
@@ -450,7 +449,7 @@ static void xfrm_byidx_resize(int total)
         for (i = hmask; i >= 0; i--)
                 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
 
-        xfrm_policy_byidx = nidx;
+        init_net.xfrm.policy_byidx = nidx;
         xfrm_idx_hmask = nhashmask;
 
         write_unlock_bh(&xfrm_policy_lock);
@@ -536,7 +535,7 @@ static u32 xfrm_gen_index(int dir)
                 idx_generator += 8;
                 if (idx == 0)
                         idx = 8;
-                list = xfrm_policy_byidx + idx_hash(idx);
+                list = init_net.xfrm.policy_byidx + idx_hash(idx);
                 found = 0;
                 hlist_for_each_entry(p, entry, list, byidx) {
                         if (p->index == idx) {
@@ -609,7 +608,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
                 xfrm_policy_count[dir]--;
         }
         policy->index = delpol ? delpol->index : xfrm_gen_index(dir);
-        hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
+        hlist_add_head(&policy->byidx, init_net.xfrm.policy_byidx+idx_hash(policy->index));
         policy->curlft.add_time = get_seconds();
         policy->curlft.use_time = 0;
         if (!mod_timer(&policy->timer, jiffies + HZ))
@@ -711,7 +710,7 @@ struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
 
         *err = 0;
         write_lock_bh(&xfrm_policy_lock);
-        chain = xfrm_policy_byidx + idx_hash(id);
+        chain = init_net.xfrm.policy_byidx + idx_hash(id);
         ret = NULL;
         hlist_for_each_entry(pol, entry, chain, byidx) {
                 if (pol->type == type && pol->index == id) {
@@ -1087,7 +1086,7 @@ static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
 
         list_add(&pol->walk.all, &init_net.xfrm.policy_all);
         hlist_add_head(&pol->bydst, chain);
-        hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
+        hlist_add_head(&pol->byidx, init_net.xfrm.policy_byidx+idx_hash(pol->index));
         xfrm_policy_count[dir]++;
         xfrm_pol_hold(pol);
 
@@ -2408,10 +2407,10 @@ static int __net_init xfrm_policy_init(struct net *net)
         hmask = 8 - 1;
         sz = (hmask+1) * sizeof(struct hlist_head);
 
-        xfrm_policy_byidx = xfrm_hash_alloc(sz);
+        net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
+        if (!net->xfrm.policy_byidx)
+                goto out_byidx;
         xfrm_idx_hmask = hmask;
-        if (!xfrm_policy_byidx)
-                panic("XFRM: failed to allocate byidx hash\n");
 
         for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
                 struct xfrm_policy_hash *htab;
@@ -2429,11 +2428,20 @@ static int __net_init xfrm_policy_init(struct net *net)
         if (net_eq(net, &init_net))
                 register_netdevice_notifier(&xfrm_dev_notifier);
         return 0;
+
+out_byidx:
+        return -ENOMEM;
 }
 
 static void xfrm_policy_fini(struct net *net)
 {
+        unsigned int sz;
+
         WARN_ON(!list_empty(&net->xfrm.policy_all));
+
+        sz = (xfrm_idx_hmask + 1) * sizeof(struct hlist_head);
+        WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
+        xfrm_hash_free(net->xfrm.policy_byidx, sz);
 }
 
 static int __net_init xfrm_net_init(struct net *net)