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Revert "Revert "net: xfrm: Localize sequence counter per network namespace""

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This reverts commit 1aff922933 as we are
free to update the ABI at this point in time.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iba293953586fd78503ef5f47db40ccdc03b098f5
This commit is contained in:
Greg Kroah-Hartman
2021-04-15 14:26:11 +02:00
committed by Todd Kjos
parent 2d9841f98d
commit a629454175
2 changed files with 8 additions and 6 deletions
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10
net/xfrm/xfrm_state.c
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@@ -44,7 +44,6 @@ static void xfrm_state_gc_task(struct work_struct *work);
*/
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
static struct kmem_cache *xfrm_state_cache __ro_after_init;
static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
@@ -140,7 +139,7 @@ static void xfrm_hash_resize(struct work_struct *work)
}
spin_lock_bh(&net->xfrm.xfrm_state_lock);
write_seqcount_begin(&xfrm_state_hash_generation);
write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
@@ -156,7 +155,7 @@ static void xfrm_hash_resize(struct work_struct *work)
rcu_assign_pointer(net->xfrm.state_byspi, nspi);
net->xfrm.state_hmask = nhashmask;
write_seqcount_end(&xfrm_state_hash_generation);
write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
osize = (ohashmask + 1) * sizeof(struct hlist_head);
@@ -1061,7 +1060,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
to_put = NULL;
sequence = read_seqcount_begin(&xfrm_state_hash_generation);
sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
rcu_read_lock();
h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
@@ -1174,7 +1173,7 @@ out:
if (to_put)
xfrm_state_put(to_put);
if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
*err = -EAGAIN;
if (x) {
xfrm_state_put(x);
@@ -2667,6 +2666,7 @@ int __net_init xfrm_state_init(struct net *net)
net->xfrm.state_num = 0;
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
spin_lock_init(&net->xfrm.xfrm_state_lock);
seqcount_init(&net->xfrm.xfrm_state_hash_generation);
return 0;
out_byspi: