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-rw-r--r--include/net/sock.h3
-rw-r--r--net/core/sock.c47
-rw-r--r--net/ipv4/udp.c1
-rw-r--r--net/ipv4/udplite.c1
-rw-r--r--net/ipv6/udp.c1
-rw-r--r--net/ipv6/udplite.c1
6 files changed, 42 insertions, 12 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 659d968d95c5..7d3f7ce239b5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -754,6 +754,7 @@ struct proto {
void (*unhash)(struct sock *sk);
void (*rehash)(struct sock *sk);
int (*get_port)(struct sock *sk, unsigned short snum);
+ void (*clear_sk)(struct sock *sk, int size);
/* Keeping track of sockets in use */
#ifdef CONFIG_PROC_FS
@@ -852,6 +853,8 @@ static inline void __sk_prot_rehash(struct sock *sk)
sk->sk_prot->hash(sk);
}
+void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);
+
/* About 10 seconds */
#define SOCK_DESTROY_TIME (10*HZ)
diff --git a/net/core/sock.c b/net/core/sock.c
index fb6080111461..e5af8d5d5b50 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1009,6 +1009,36 @@ static void sock_copy(struct sock *nsk, const struct sock *osk)
#endif
}
+/*
+ * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
+ * un-modified. Special care is taken when initializing object to zero.
+ */
+static inline void sk_prot_clear_nulls(struct sock *sk, int size)
+{
+ if (offsetof(struct sock, sk_node.next) != 0)
+ memset(sk, 0, offsetof(struct sock, sk_node.next));
+ memset(&sk->sk_node.pprev, 0,
+ size - offsetof(struct sock, sk_node.pprev));
+}
+
+void sk_prot_clear_portaddr_nulls(struct sock *sk, int size)
+{
+ unsigned long nulls1, nulls2;
+
+ nulls1 = offsetof(struct sock, __sk_common.skc_node.next);
+ nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next);
+ if (nulls1 > nulls2)
+ swap(nulls1, nulls2);
+
+ if (nulls1 != 0)
+ memset((char *)sk, 0, nulls1);
+ memset((char *)sk + nulls1 + sizeof(void *), 0,
+ nulls2 - nulls1 - sizeof(void *));
+ memset((char *)sk + nulls2 + sizeof(void *), 0,
+ size - nulls2 - sizeof(void *));
+}
+EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls);
+
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
int family)
{
@@ -1021,19 +1051,12 @@ static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
if (!sk)
return sk;
if (priority & __GFP_ZERO) {
- /*
- * caches using SLAB_DESTROY_BY_RCU should let
- * sk_node.next un-modified. Special care is taken
- * when initializing object to zero.
- */
- if (offsetof(struct sock, sk_node.next) != 0)
- memset(sk, 0, offsetof(struct sock, sk_node.next));
- memset(&sk->sk_node.pprev, 0,
- prot->obj_size - offsetof(struct sock,
- sk_node.pprev));
+ if (prot->clear_sk)
+ prot->clear_sk(sk, prot->obj_size);
+ else
+ sk_prot_clear_nulls(sk, prot->obj_size);
}
- }
- else
+ } else
sk = kmalloc(prot->obj_size, priority);
if (sk != NULL) {
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5e0a3a582a59..2d3ded4d0786 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1899,6 +1899,7 @@ struct proto udp_prot = {
.compat_setsockopt = compat_udp_setsockopt,
.compat_getsockopt = compat_udp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
EXPORT_SYMBOL(udp_prot);
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index ab76aa928fa9..aee9963f7f5a 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -57,6 +57,7 @@ struct proto udplite_prot = {
.compat_setsockopt = compat_udp_setsockopt,
.compat_getsockopt = compat_udp_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
EXPORT_SYMBOL(udplite_prot);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 91def93bec85..cd6cb7c3e563 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1477,6 +1477,7 @@ struct proto udpv6_prot = {
.compat_setsockopt = compat_udpv6_setsockopt,
.compat_getsockopt = compat_udpv6_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
static struct inet_protosw udpv6_protosw = {
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index 5f48fadc27f7..986c4de5292e 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -55,6 +55,7 @@ struct proto udplitev6_prot = {
.compat_setsockopt = compat_udpv6_setsockopt,
.compat_getsockopt = compat_udpv6_getsockopt,
#endif
+ .clear_sk = sk_prot_clear_portaddr_nulls,
};
static struct inet_protosw udplite6_protosw = {