sock: struct proto hash function may error
In order to support fast reuseport lookups in TCP, the hash function
defined in struct proto must be capable of returning an error code.
This patch changes the function signature of all related hash functions
to return an integer and handles or propagates this return value at
all call sites.
Signed-off-by: Craig Gallek <kraig@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index de2e3ad..554440e 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -208,7 +208,7 @@
bool inet_ehash_insert(struct sock *sk, struct sock *osk);
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
void __inet_hash(struct sock *sk, struct sock *osk);
-void inet_hash(struct sock *sk);
+int inet_hash(struct sock *sk);
void inet_unhash(struct sock *sk);
struct sock *__inet_lookup_listener(struct net *net,
diff --git a/include/net/phonet/phonet.h b/include/net/phonet/phonet.h
index 68e5097..039cc29 100644
--- a/include/net/phonet/phonet.h
+++ b/include/net/phonet/phonet.h
@@ -51,7 +51,7 @@
struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
void phonet_get_local_port_range(int *min, int *max);
-void pn_sock_hash(struct sock *sk);
+int pn_sock_hash(struct sock *sk);
void pn_sock_unhash(struct sock *sk);
int pn_sock_get_port(struct sock *sk, unsigned short sport);
diff --git a/include/net/ping.h b/include/net/ping.h
index ac80cb4..5fd7cc2 100644
--- a/include/net/ping.h
+++ b/include/net/ping.h
@@ -65,7 +65,7 @@
};
int ping_get_port(struct sock *sk, unsigned short ident);
-void ping_hash(struct sock *sk);
+int ping_hash(struct sock *sk);
void ping_unhash(struct sock *sk);
int ping_init_sock(struct sock *sk);
diff --git a/include/net/raw.h b/include/net/raw.h
index 6a40c65..3e78900 100644
--- a/include/net/raw.h
+++ b/include/net/raw.h
@@ -57,7 +57,7 @@
#endif
-void raw_hash_sk(struct sock *sk);
+int raw_hash_sk(struct sock *sk);
void raw_unhash_sk(struct sock *sk);
struct raw_sock {
diff --git a/include/net/sock.h b/include/net/sock.h
index f5ea148..255d3e0 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -984,7 +984,7 @@
void (*release_cb)(struct sock *sk);
/* Keeping track of sk's, looking them up, and port selection methods. */
- void (*hash)(struct sock *sk);
+ int (*hash)(struct sock *sk);
void (*unhash)(struct sock *sk);
void (*rehash)(struct sock *sk);
int (*get_port)(struct sock *sk, unsigned short snum);
@@ -1194,10 +1194,10 @@
/* With per-bucket locks this operation is not-atomic, so that
* this version is not worse.
*/
-static inline void __sk_prot_rehash(struct sock *sk)
+static inline int __sk_prot_rehash(struct sock *sk)
{
sk->sk_prot->unhash(sk);
- sk->sk_prot->hash(sk);
+ return sk->sk_prot->hash(sk);
}
void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);
diff --git a/include/net/udp.h b/include/net/udp.h
index 2842541..92927f7 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -177,9 +177,10 @@
}
/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
-static inline void udp_lib_hash(struct sock *sk)
+static inline int udp_lib_hash(struct sock *sk)
{
BUG();
+ return 0;
}
void udp_lib_unhash(struct sock *sk);
diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index a548be2..e0bd013 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -182,12 +182,14 @@
static HLIST_HEAD(raw_head);
static DEFINE_RWLOCK(raw_lock);
-static void raw_hash(struct sock *sk)
+static int raw_hash(struct sock *sk)
{
write_lock_bh(&raw_lock);
sk_add_node(sk, &raw_head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
write_unlock_bh(&raw_lock);
+
+ return 0;
}
static void raw_unhash(struct sock *sk)
@@ -462,12 +464,14 @@
return container_of(sk, struct dgram_sock, sk);
}
-static void dgram_hash(struct sock *sk)
+static int dgram_hash(struct sock *sk)
{
write_lock_bh(&dgram_lock);
sk_add_node(sk, &dgram_head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
write_unlock_bh(&dgram_lock);
+
+ return 0;
}
static void dgram_unhash(struct sock *sk)
@@ -1026,8 +1030,13 @@
/* Checksums on by default */
sock_set_flag(sk, SOCK_ZAPPED);
- if (sk->sk_prot->hash)
- sk->sk_prot->hash(sk);
+ if (sk->sk_prot->hash) {
+ rc = sk->sk_prot->hash(sk);
+ if (rc) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
if (sk->sk_prot->init) {
rc = sk->sk_prot->init(sk);
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 5c5db66..eade66d 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -370,7 +370,11 @@
*/
inet->inet_sport = htons(inet->inet_num);
/* Add to protocol hash chains. */
- sk->sk_prot->hash(sk);
+ err = sk->sk_prot->hash(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
}
if (sk->sk_prot->init) {
@@ -1142,8 +1146,7 @@
* Besides that, it does not check for connection
* uniqueness. Wait for troubles.
*/
- __sk_prot_rehash(sk);
- return 0;
+ return __sk_prot_rehash(sk);
}
int inet_sk_rebuild_header(struct sock *sk)
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 9b17c179..12c8d38 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -734,6 +734,7 @@
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct inet_sock *inet = inet_sk(sk);
+ int err = -EADDRINUSE;
reqsk_queue_alloc(&icsk->icsk_accept_queue);
@@ -751,13 +752,14 @@
inet->inet_sport = htons(inet->inet_num);
sk_dst_reset(sk);
- sk->sk_prot->hash(sk);
+ err = sk->sk_prot->hash(sk);
- return 0;
+ if (likely(!err))
+ return 0;
}
sk->sk_state = TCP_CLOSE;
- return -EADDRINUSE;
+ return err;
}
EXPORT_SYMBOL_GPL(inet_csk_listen_start);
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index ccc5980..b6023b7 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -468,13 +468,15 @@
}
EXPORT_SYMBOL(__inet_hash);
-void inet_hash(struct sock *sk)
+int inet_hash(struct sock *sk)
{
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
__inet_hash(sk, NULL);
local_bh_enable();
}
+
+ return 0;
}
EXPORT_SYMBOL_GPL(inet_hash);
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index c117b21..f6f93fc 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -145,10 +145,12 @@
}
EXPORT_SYMBOL_GPL(ping_get_port);
-void ping_hash(struct sock *sk)
+int ping_hash(struct sock *sk)
{
pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
BUG(); /* "Please do not press this button again." */
+
+ return 0;
}
void ping_unhash(struct sock *sk)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index bc35f18..d635251 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -93,7 +93,7 @@
.lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
};
-void raw_hash_sk(struct sock *sk)
+int raw_hash_sk(struct sock *sk)
{
struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
struct hlist_head *head;
@@ -104,6 +104,8 @@
sk_add_node(sk, head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
write_unlock_bh(&h->lock);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(raw_hash_sk);
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 9f5137c..b11c37c 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -235,7 +235,11 @@
* creation time automatically shares.
*/
inet->inet_sport = htons(inet->inet_num);
- sk->sk_prot->hash(sk);
+ err = sk->sk_prot->hash(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
}
if (sk->sk_prot->init) {
err = sk->sk_prot->init(sk);
diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index d575ef4..ffd5f22 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -140,13 +140,15 @@
rcu_read_unlock();
}
-void pn_sock_hash(struct sock *sk)
+int pn_sock_hash(struct sock *sk)
{
struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
mutex_lock(&pnsocks.lock);
sk_add_node_rcu(sk, hlist);
mutex_unlock(&pnsocks.lock);
+
+ return 0;
}
EXPORT_SYMBOL(pn_sock_hash);
@@ -200,7 +202,7 @@
pn->resource = spn->spn_resource;
/* Enable RX on the socket */
- sk->sk_prot->hash(sk);
+ err = sk->sk_prot->hash(sk);
out_port:
mutex_unlock(&port_mutex);
out:
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 5ca2ebf..6427b9d 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6101,9 +6101,10 @@
return retval;
}
-static void sctp_hash(struct sock *sk)
+static int sctp_hash(struct sock *sk)
{
/* STUB */
+ return 0;
}
static void sctp_unhash(struct sock *sk)