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authorDavid Howells <dhowells@redhat.com>2017-05-24 19:02:32 +0300
committerDavid S. Miller <davem@davemloft.net>2017-05-25 20:15:11 +0300
commit2baec2c3f854d1f79c7bb28386484e144e864a14 (patch)
tree4b416db84d3579fe825458d021951955d120ed69 /net/rxrpc/af_rxrpc.c
parent878cd3ba37f77ded9c85e9857e3182a7fe8f5dc3 (diff)
downloadlinux-2baec2c3f854d1f79c7bb28386484e144e864a14.tar.xz
rxrpc: Support network namespacing
Support network namespacing in AF_RXRPC with the following changes: (1) All the local endpoint, peer and call lists, locks, counters, etc. are moved into the per-namespace record. (2) All the connection tracking is moved into the per-namespace record with the exception of the client connection ID tree, which is kept global so that connection IDs are kept unique per-machine. (3) Each namespace gets its own epoch. This allows each network namespace to pretend to be a separate client machine. (4) The /proc/net/rxrpc_xxx files are now called /proc/net/rxrpc/xxx and the contents reflect the namespace. fs/afs/ should be okay with this patch as it explicitly requires the current net namespace to be init_net to permit a mount to proceed at the moment. It will, however, need updating so that cells, IP addresses and DNS records are per-namespace also. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rxrpc/af_rxrpc.c')
-rw-r--r--net/rxrpc/af_rxrpc.c35
1 files changed, 15 insertions, 20 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 7fb59c3f1542..cd34ffbff1d1 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -38,9 +38,6 @@ MODULE_PARM_DESC(debug, "RxRPC debugging mask");
static struct proto rxrpc_proto;
static const struct proto_ops rxrpc_rpc_ops;
-/* local epoch for detecting local-end reset */
-u32 rxrpc_epoch;
-
/* current debugging ID */
atomic_t rxrpc_debug_id;
@@ -155,7 +152,7 @@ static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
memcpy(&rx->srx, srx, sizeof(rx->srx));
- local = rxrpc_lookup_local(&rx->srx);
+ local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
if (IS_ERR(local)) {
ret = PTR_ERR(local);
goto error_unlock;
@@ -434,7 +431,7 @@ static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
ret = -EAFNOSUPPORT;
goto error_unlock;
}
- local = rxrpc_lookup_local(&rx->srx);
+ local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
if (IS_ERR(local)) {
ret = PTR_ERR(local);
goto error_unlock;
@@ -582,9 +579,6 @@ static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
_enter("%p,%d", sock, protocol);
- if (!net_eq(net, &init_net))
- return -EAFNOSUPPORT;
-
/* we support transport protocol UDP/UDP6 only */
if (protocol != PF_INET &&
IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
@@ -780,8 +774,6 @@ static int __init af_rxrpc_init(void)
BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
- get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
- rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
get_random_bytes(&tmp, sizeof(tmp));
tmp &= 0x3fffffff;
if (tmp == 0)
@@ -809,6 +801,10 @@ static int __init af_rxrpc_init(void)
goto error_security;
}
+ ret = register_pernet_subsys(&rxrpc_net_ops);
+ if (ret)
+ goto error_pernet;
+
ret = proto_register(&rxrpc_proto, 1);
if (ret < 0) {
pr_crit("Cannot register protocol\n");
@@ -839,11 +835,6 @@ static int __init af_rxrpc_init(void)
goto error_sysctls;
}
-#ifdef CONFIG_PROC_FS
- proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
- proc_create("rxrpc_conns", 0, init_net.proc_net,
- &rxrpc_connection_seq_fops);
-#endif
return 0;
error_sysctls:
@@ -855,6 +846,8 @@ error_key_type:
error_sock:
proto_unregister(&rxrpc_proto);
error_proto:
+ unregister_pernet_subsys(&rxrpc_net_ops);
+error_pernet:
rxrpc_exit_security();
error_security:
destroy_workqueue(rxrpc_workqueue);
@@ -875,14 +868,16 @@ static void __exit af_rxrpc_exit(void)
unregister_key_type(&key_type_rxrpc);
sock_unregister(PF_RXRPC);
proto_unregister(&rxrpc_proto);
- rxrpc_destroy_all_calls();
- rxrpc_destroy_all_connections();
+ unregister_pernet_subsys(&rxrpc_net_ops);
ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
- rxrpc_destroy_all_locals();
- remove_proc_entry("rxrpc_conns", init_net.proc_net);
- remove_proc_entry("rxrpc_calls", init_net.proc_net);
+ /* Make sure the local and peer records pinned by any dying connections
+ * are released.
+ */
+ rcu_barrier();
+ rxrpc_destroy_client_conn_ids();
+
destroy_workqueue(rxrpc_workqueue);
rxrpc_exit_security();
kmem_cache_destroy(rxrpc_call_jar);