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authorTuong Lien <tuong.t.lien@dektech.com.au>2019-11-08 08:05:11 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-09 01:01:59 +0300
commitfc1b6d6de2208774efd2a20bf0daddb02d18b1e0 (patch)
tree436f11e640d07d4d3578b4897e394546b1e25da3 /net/tipc/core.c
parent134bdac397661a5841d9f27f508190c68b26232b (diff)
downloadlinux-fc1b6d6de2208774efd2a20bf0daddb02d18b1e0.tar.xz
tipc: introduce TIPC encryption & authentication
This commit offers an option to encrypt and authenticate all messaging, including the neighbor discovery messages. The currently most advanced algorithm supported is the AEAD AES-GCM (like IPSec or TLS). All encryption/decryption is done at the bearer layer, just before leaving or after entering TIPC. Supported features: - Encryption & authentication of all TIPC messages (header + data); - Two symmetric-key modes: Cluster and Per-node; - Automatic key switching; - Key-expired revoking (sequence number wrapped); - Lock-free encryption/decryption (RCU); - Asynchronous crypto, Intel AES-NI supported; - Multiple cipher transforms; - Logs & statistics; Two key modes: - Cluster key mode: One single key is used for both TX & RX in all nodes in the cluster. - Per-node key mode: Each nodes in the cluster has one specific TX key. For RX, a node requires its peers' TX key to be able to decrypt the messages from those peers. Key setting from user-space is performed via netlink by a user program (e.g. the iproute2 'tipc' tool). Internal key state machine: Attach Align(RX) +-+ +-+ | V | V +---------+ Attach +---------+ | IDLE |---------------->| PENDING |(user = 0) +---------+ +---------+ A A Switch| A | | | | | | Free(switch/revoked) | | (Free)| +----------------------+ | |Timeout | (TX) | | |(RX) | | | | | | v | +---------+ Switch +---------+ | PASSIVE |<----------------| ACTIVE | +---------+ (RX) +---------+ (user = 1) (user >= 1) The number of TFMs is 10 by default and can be changed via the procfs 'net/tipc/max_tfms'. At this moment, as for simplicity, this file is also used to print the crypto statistics at runtime: echo 0xfff1 > /proc/sys/net/tipc/max_tfms The patch defines a new TIPC version (v7) for the encryption message (- backward compatibility as well). The message is basically encapsulated as follows: +----------------------------------------------------------+ | TIPCv7 encryption | Original TIPCv2 | Authentication | | header | packet (encrypted) | Tag | +----------------------------------------------------------+ The throughput is about ~40% for small messages (compared with non- encryption) and ~9% for large messages. With the support from hardware crypto i.e. the Intel AES-NI CPU instructions, the throughput increases upto ~85% for small messages and ~55% for large messages. By default, the new feature is inactive (i.e. no encryption) until user sets a key for TIPC. There is however also a new option - "TIPC_CRYPTO" in the kernel configuration to enable/disable the new code when needed. MAINTAINERS | add two new files 'crypto.h' & 'crypto.c' in tipc Acked-by: Ying Xue <ying.xue@windreiver.com> Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/core.c')
-rw-r--r--net/tipc/core.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/tipc/core.c b/net/tipc/core.c
index ab648dd150ee..fc01a13d7462 100644
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -44,6 +44,7 @@
#include "socket.h"
#include "bcast.h"
#include "node.h"
+#include "crypto.h"
#include <linux/module.h>
@@ -68,6 +69,11 @@ static int __net_init tipc_init_net(struct net *net)
INIT_LIST_HEAD(&tn->node_list);
spin_lock_init(&tn->node_list_lock);
+#ifdef CONFIG_TIPC_CRYPTO
+ err = tipc_crypto_start(&tn->crypto_tx, net, NULL);
+ if (err)
+ goto out_crypto;
+#endif
err = tipc_sk_rht_init(net);
if (err)
goto out_sk_rht;
@@ -93,6 +99,11 @@ out_bclink:
out_nametbl:
tipc_sk_rht_destroy(net);
out_sk_rht:
+
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_stop(&tn->crypto_tx);
+out_crypto:
+#endif
return err;
}
@@ -103,6 +114,9 @@ static void __net_exit tipc_exit_net(struct net *net)
tipc_bcast_stop(net);
tipc_nametbl_stop(net);
tipc_sk_rht_destroy(net);
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_stop(&tipc_net(net)->crypto_tx);
+#endif
}
static void __net_exit tipc_pernet_pre_exit(struct net *net)