jenna
/
kernel_samsung_sm7125
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

net: Modify sk_alloc to not reference count the netns of kernel sockets.

Browse Source 
Now that sk_alloc knows when a kernel socket is being allocated modify
it to not reference count the network namespace of kernel sockets.

Keep track of if a socket needs reference counting by adding a flag to
struct sock called sk_net_refcnt.

Update all of the callers of sock_create_kern to stop using
sk_change_net and sk_release_kernel as those hacks are no longer
needed, to avoid reference counting a kernel socket.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
tirimbino
Eric W. Biederman 10 years ago committed by David S. Miller
parent 11aa9c28b4
commit 26abe14379
8 changed files with 30 additions and 45 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 2
      include/net/inet_common.h
  2. 2
      include/net/sock.h
  3. 8
      net/core/sock.c
  4. 4
      net/ipv4/af_inet.c
  5. 8
      net/ipv4/udp_tunnel.c
  6. 6
      net/ipv6/ip6_udp_tunnel.c
  7. 15
      net/l2tp/l2tp_core.c
  8. 30
      net/netfilter/ipvs/ip_vs_sync.c

2
include/net/inet_common.h
Unescape View File

@ -41,7 +41,7 @@ int inet_recv_error(struct sock *sk, struct msghdr *msg, int len,
static inline void inet_ctl_sock_destroy(struct sock *sk)
{
sk_release_kernel(sk);
sock_release(sk->sk_socket);
}
#endif

2
include/net/sock.h
Unescape View File

@ -184,6 +184,7 @@ struct sock_common {
unsigned char skc_reuse:4;
unsigned char skc_reuseport:1;
unsigned char skc_ipv6only:1;
unsigned char skc_net_refcnt:1;
int skc_bound_dev_if;
union {
struct hlist_node skc_bind_node;
@ -323,6 +324,7 @@ struct sock {
#define sk_reuse __sk_common.skc_reuse
#define sk_reuseport __sk_common.skc_reuseport
#define sk_ipv6only __sk_common.skc_ipv6only
#define sk_net_refcnt __sk_common.skc_net_refcnt
#define sk_bound_dev_if __sk_common.skc_bound_dev_if
#define sk_bind_node __sk_common.skc_bind_node
#define sk_prot __sk_common.skc_prot

8
net/core/sock.c
Unescape View File

@ -1412,7 +1412,10 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
*/
sk->sk_prot = sk->sk_prot_creator = prot;
sock_lock_init(sk);
sock_net_set(sk, get_net(net));
sk->sk_net_refcnt = kern ? 0 : 1;
if (likely(sk->sk_net_refcnt))
get_net(net);
sock_net_set(sk, net);
atomic_set(&sk->sk_wmem_alloc, 1);
sock_update_classid(sk);
@ -1446,7 +1449,8 @@ static void __sk_free(struct sock *sk)
if (sk->sk_peer_cred)
put_cred(sk->sk_peer_cred);
put_pid(sk->sk_peer_pid);
put_net(sock_net(sk));
if (likely(sk->sk_net_refcnt))
put_net(sock_net(sk));
sk_prot_free(sk->sk_prot_creator, sk);
}

4
net/ipv4/af_inet.c
Unescape View File

@ -1430,7 +1430,7 @@ int inet_ctl_sock_create(struct sock **sk, unsigned short family,
struct net *net)
{
struct socket *sock;
int rc = sock_create_kern(&init_net, family, type, protocol, &sock);
int rc = sock_create_kern(net, family, type, protocol, &sock);
if (rc == 0) {
*sk = sock->sk;
@ -1440,8 +1440,6 @@ int inet_ctl_sock_create(struct sock **sk, unsigned short family,
* we do not wish this socket to see incoming packets.
*/
(*sk)->sk_prot->unhash(*sk);
sk_change_net(*sk, net);
}
return rc;
}

8
net/ipv4/udp_tunnel.c
Unescape View File

@ -15,12 +15,10 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
struct socket *sock = NULL;
struct sockaddr_in udp_addr;
err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &sock);
err = sock_create_kern(net, AF_INET, SOCK_DGRAM, 0, &sock);
if (err < 0)
goto error;
sk_change_net(sock->sk, net);
udp_addr.sin_family = AF_INET;
udp_addr.sin_addr = cfg->local_ip;
udp_addr.sin_port = cfg->local_udp_port;
@ -47,7 +45,7 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
error:
if (sock) {
kernel_sock_shutdown(sock, SHUT_RDWR);
sk_release_kernel(sock->sk);
sock_release(sock);
}
*sockp = NULL;
return err;
@ -101,7 +99,7 @@ void udp_tunnel_sock_release(struct socket *sock)
{
rcu_assign_sk_user_data(sock->sk, NULL);
kernel_sock_shutdown(sock, SHUT_RDWR);
sk_release_kernel(sock->sk);
sock_release(sock);
}
EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);

6
net/ipv6/ip6_udp_tunnel.c
Unescape View File

@ -19,12 +19,10 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
int err;
struct socket *sock = NULL;
err = sock_create_kern(&init_net, AF_INET6, SOCK_DGRAM, 0, &sock);
err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, 0, &sock);
if (err < 0)
goto error;
sk_change_net(sock->sk, net);
udp6_addr.sin6_family = AF_INET6;
memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
sizeof(udp6_addr.sin6_addr));
@ -55,7 +53,7 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
error:
if (sock) {
kernel_sock_shutdown(sock, SHUT_RDWR);
sk_release_kernel(sock->sk);
sock_release(sock);
}
*sockp = NULL;
return err;

15
net/l2tp/l2tp_core.c
Unescape View File

@ -1334,9 +1334,10 @@ static void l2tp_tunnel_del_work(struct work_struct *work)
if (sock)
inet_shutdown(sock, 2);
} else {
if (sock)
if (sock) {
kernel_sock_shutdown(sock, SHUT_RDWR);
sk_release_kernel(sk);
sock_release(sock);
}
}
l2tp_tunnel_sock_put(sk);
@ -1399,13 +1400,11 @@ static int l2tp_tunnel_sock_create(struct net *net,
if (cfg->local_ip6 && cfg->peer_ip6) {
struct sockaddr_l2tpip6 ip6_addr = {0};
err = sock_create_kern(&init_net, AF_INET6, SOCK_DGRAM,
err = sock_create_kern(net, AF_INET6, SOCK_DGRAM,
IPPROTO_L2TP, &sock);
if (err < 0)
goto out;
sk_change_net(sock->sk, net);
ip6_addr.l2tp_family = AF_INET6;
memcpy(&ip6_addr.l2tp_addr, cfg->local_ip6,
sizeof(ip6_addr.l2tp_addr));
@ -1429,13 +1428,11 @@ static int l2tp_tunnel_sock_create(struct net *net,
{
struct sockaddr_l2tpip ip_addr = {0};
err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM,
err = sock_create_kern(net, AF_INET, SOCK_DGRAM,
IPPROTO_L2TP, &sock);
if (err < 0)
goto out;
sk_change_net(sock->sk, net);
ip_addr.l2tp_family = AF_INET;
ip_addr.l2tp_addr = cfg->local_ip;
ip_addr.l2tp_conn_id = tunnel_id;
@ -1462,7 +1459,7 @@ out:
*sockp = sock;
if ((err < 0) && sock) {
kernel_sock_shutdown(sock, SHUT_RDWR);
sk_release_kernel(sock->sk);
sock_release(sock);
*sockp = NULL;
}

30
net/netfilter/ipvs/ip_vs_sync.c
Unescape View File

@ -1457,18 +1457,12 @@ static struct socket *make_send_sock(struct net *net, int id)
struct socket *sock;
int result;
/* First create a socket move it to right name space later */
result = sock_create_kern(&init_net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
/* First create a socket */
result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
if (result < 0) {
pr_err("Error during creation of socket; terminating\n");
return ERR_PTR(result);
}
/*
* Kernel sockets that are a part of a namespace, should not
* hold a reference to a namespace in order to allow to stop it.
* After sk_change_net should be released using sk_release_kernel.
*/
sk_change_net(sock->sk, net);
result = set_mcast_if(sock->sk, ipvs->master_mcast_ifn);
if (result < 0) {
pr_err("Error setting outbound mcast interface\n");
@ -1497,7 +1491,7 @@ static struct socket *make_send_sock(struct net *net, int id)
return sock;
error:
sk_release_kernel(sock->sk);
sock_release(sock);
return ERR_PTR(result);
}
@ -1518,17 +1512,11 @@ static struct socket *make_receive_sock(struct net *net, int id)
int result;
/* First create a socket */
result = sock_create_kern(&init_net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
result = sock_create_kern(net, PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
if (result < 0) {
pr_err("Error during creation of socket; terminating\n");
return ERR_PTR(result);
}
/*
* Kernel sockets that are a part of a namespace, should not
* hold a reference to a namespace in order to allow to stop it.
* After sk_change_net should be released using sk_release_kernel.
*/
sk_change_net(sock->sk, net);
/* it is equivalent to the REUSEADDR option in user-space */
sock->sk->sk_reuse = SK_CAN_REUSE;
result = sysctl_sync_sock_size(ipvs);
@ -1554,7 +1542,7 @@ static struct socket *make_receive_sock(struct net *net, int id)
return sock;
error:
sk_release_kernel(sock->sk);
sock_release(sock);
return ERR_PTR(result);
}
@ -1692,7 +1680,7 @@ done:
ip_vs_sync_buff_release(sb);
/* release the sending multicast socket */
sk_release_kernel(tinfo->sock->sk);
sock_release(tinfo->sock);
kfree(tinfo);
return 0;
@ -1729,7 +1717,7 @@ static int sync_thread_backup(void *data)
}
/* release the sending multicast socket */
sk_release_kernel(tinfo->sock->sk);
sock_release(tinfo->sock);
kfree(tinfo->buf);
kfree(tinfo);
@ -1854,11 +1842,11 @@ int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid)
return 0;
outsocket:
sk_release_kernel(sock->sk);
sock_release(sock);
outtinfo:
if (tinfo) {
sk_release_kernel(tinfo->sock->sk);
sock_release(tinfo->sock);
kfree(tinfo->buf);
kfree(tinfo);
}

Write Preview
Loading…
Cancel
Save