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

Browse source 
This reverts commit a128e07b47 which is
commit e88add19f68191448427a6e4eb059664650a837f upstream as it messes
with the ABI.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Idec3dc7069be58d939ac919f6ac2206ee63d0ed2
This commit is contained in:
Greg Kroah-Hartman 2021-04-14 15:30:17 +02:00
commit 25acaded2f
2 changed files with 6 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/net/netns/xfrm.h
View file

@ -72,9 +72,7 @@ struct netns_xfrm {
#if IS_ENABLED(CONFIG_IPV6)
struct dst_ops xfrm6_dst_ops;
#endif
spinlock_t xfrm_state_lock;
seqcount_t xfrm_state_hash_generation;
spinlock_t xfrm_state_lock;
spinlock_t xfrm_policy_lock;
struct mutex xfrm_cfg_mutex;
};

10
net/xfrm/xfrm_state.c
View file

@ -44,6 +44,7 @@ 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);
@ -139,7 +140,7 @@ static void xfrm_hash_resize(struct work_struct *work)
}
spin_lock_bh(&net->xfrm.xfrm_state_lock);
write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
write_seqcount_begin(&xfrm_state_hash_generation);
nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
@ -155,7 +156,7 @@ 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(&net->xfrm.xfrm_state_hash_generation);
write_seqcount_end(&xfrm_state_hash_generation);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
osize = (ohashmask + 1) * sizeof(struct hlist_head);
@ -1057,7 +1058,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
to_put = NULL;
sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
sequence = read_seqcount_begin(&xfrm_state_hash_generation);
rcu_read_lock();
h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
@ -1170,7 +1171,7 @@ out:
if (to_put)
xfrm_state_put(to_put);
if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
*err = -EAGAIN;
if (x) {
xfrm_state_put(x);
@ -2661,7 +2662,6 @@ 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: