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rxrpc: Support network namespacing

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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>
This commit is contained in:
David Howells
2017-05-24 17:02:32 +01:00
committed by David S. Miller
parent 878cd3ba37
commit 2baec2c3f8
12 changed files with 356 additions and 216 deletions
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35
net/rxrpc/af_rxrpc.c
View File

@@ -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);