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Message-Id: <20191108050512.4156-5-tuong.t.lien@dektech.com.au>
Date: Fri, 8 Nov 2019 12:05:11 +0700
From: Tuong Lien <tuong.t.lien@...tech.com.au>
To: davem@...emloft.net, jon.maloy@...csson.com, maloy@...jonn.com,
ying.xue@...driver.com, netdev@...r.kernel.org
Cc: tipc-discussion@...ts.sourceforge.net
Subject: [net-next v2 4/5] 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@...dreiver.com>
Acked-by: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@...tech.com.au>
---
net/tipc/Kconfig | 15 +
net/tipc/Makefile | 1 +
net/tipc/bcast.c | 2 +-
net/tipc/bearer.c | 35 +-
net/tipc/bearer.h | 3 +-
net/tipc/core.c | 14 +
net/tipc/core.h | 8 +
net/tipc/crypto.c | 1986 ++++++++++++++++++++++++++++++++++++++++++++++++++
net/tipc/crypto.h | 167 +++++
net/tipc/link.c | 19 +-
net/tipc/link.h | 1 +
net/tipc/msg.c | 15 +-
net/tipc/msg.h | 46 +-
net/tipc/node.c | 99 ++-
net/tipc/node.h | 8 +
net/tipc/sysctl.c | 11 +
net/tipc/udp_media.c | 1 +
17 files changed, 2385 insertions(+), 46 deletions(-)
create mode 100644 net/tipc/crypto.c
create mode 100644 net/tipc/crypto.h
diff --git a/net/tipc/Kconfig b/net/tipc/Kconfig
index b83e16ade4d2..716b61a701a8 100644
--- a/net/tipc/Kconfig
+++ b/net/tipc/Kconfig
@@ -35,6 +35,21 @@ config TIPC_MEDIA_UDP
Saying Y here will enable support for running TIPC over IP/UDP
bool
default y
+config TIPC_CRYPTO
+ bool "TIPC encryption support"
+ depends on TIPC
+ select CRYPTO
+ select CRYPTO_AES
+ select CRYPTO_GCM
+ help
+ Saying Y here will enable support for TIPC encryption.
+ All TIPC messages will be encrypted/decrypted by using the currently most
+ advanced algorithm: AEAD AES-GCM (like IPSec or TLS) before leaving/
+ entering the TIPC stack.
+ Key setting from user-space is performed via netlink by a user program
+ (e.g. the iproute2 'tipc' tool).
+ bool
+ default y
config TIPC_DIAG
tristate "TIPC: socket monitoring interface"
diff --git a/net/tipc/Makefile b/net/tipc/Makefile
index c86aba0282af..11255e970dd4 100644
--- a/net/tipc/Makefile
+++ b/net/tipc/Makefile
@@ -16,6 +16,7 @@ CFLAGS_trace.o += -I$(src)
tipc-$(CONFIG_TIPC_MEDIA_UDP) += udp_media.o
tipc-$(CONFIG_TIPC_MEDIA_IB) += ib_media.o
tipc-$(CONFIG_SYSCTL) += sysctl.o
+tipc-$(CONFIG_TIPC_CRYPTO) += crypto.o
obj-$(CONFIG_TIPC_DIAG) += diag.o
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 6ef1abdd525f..f41096a759fa 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -84,7 +84,7 @@ static struct tipc_bc_base *tipc_bc_base(struct net *net)
*/
int tipc_bcast_get_mtu(struct net *net)
{
- return tipc_link_mtu(tipc_bc_sndlink(net)) - INT_H_SIZE;
+ return tipc_link_mss(tipc_bc_sndlink(net));
}
void tipc_bcast_disable_rcast(struct net *net)
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 6e15b9b1f1ef..d7ec26bd739d 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -44,6 +44,7 @@
#include "netlink.h"
#include "udp_media.h"
#include "trace.h"
+#include "crypto.h"
#define MAX_ADDR_STR 60
@@ -516,10 +517,15 @@ void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
rcu_read_lock();
b = bearer_get(net, bearer_id);
- if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
- b->media->send_msg(net, skb, b, dest);
- else
+ if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_xmit(net, &skb, b, dest, NULL);
+ if (skb)
+#endif
+ b->media->send_msg(net, skb, b, dest);
+ } else {
kfree_skb(skb);
+ }
rcu_read_unlock();
}
@@ -527,7 +533,8 @@ void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
*/
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq,
- struct tipc_media_addr *dst)
+ struct tipc_media_addr *dst,
+ struct tipc_node *__dnode)
{
struct tipc_bearer *b;
struct sk_buff *skb, *tmp;
@@ -541,10 +548,15 @@ void tipc_bearer_xmit(struct net *net, u32 bearer_id,
__skb_queue_purge(xmitq);
skb_queue_walk_safe(xmitq, skb, tmp) {
__skb_dequeue(xmitq);
- if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
- b->media->send_msg(net, skb, b, dst);
- else
+ if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_xmit(net, &skb, b, dst, __dnode);
+ if (skb)
+#endif
+ b->media->send_msg(net, skb, b, dst);
+ } else {
kfree_skb(skb);
+ }
}
rcu_read_unlock();
}
@@ -555,6 +567,7 @@ void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq)
{
struct tipc_net *tn = tipc_net(net);
+ struct tipc_media_addr *dst;
int net_id = tn->net_id;
struct tipc_bearer *b;
struct sk_buff *skb, *tmp;
@@ -569,7 +582,12 @@ void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
msg_set_non_seq(hdr, 1);
msg_set_mc_netid(hdr, net_id);
__skb_dequeue(xmitq);
- b->media->send_msg(net, skb, b, &b->bcast_addr);
+ dst = &b->bcast_addr;
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_xmit(net, &skb, b, dst, NULL);
+ if (skb)
+#endif
+ b->media->send_msg(net, skb, b, dst);
}
rcu_read_unlock();
}
@@ -596,6 +614,7 @@ static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
if (likely(b && test_bit(0, &b->up) &&
(skb->pkt_type <= PACKET_MULTICAST))) {
skb_mark_not_on_list(skb);
+ TIPC_SKB_CB(skb)->flags = 0;
tipc_rcv(dev_net(b->pt.dev), skb, b);
rcu_read_unlock();
return NET_RX_SUCCESS;
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index faca696d422f..d0c79cc6c0c2 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -232,7 +232,8 @@ void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
struct tipc_media_addr *dest);
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq,
- struct tipc_media_addr *dst);
+ struct tipc_media_addr *dst,
+ struct tipc_node *__dnode);
void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq);
void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts);
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 @@ static int __net_init tipc_init_net(struct net *net)
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)
diff --git a/net/tipc/core.h b/net/tipc/core.h
index 8776d32a4a47..775848a5f27e 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -68,6 +68,9 @@ struct tipc_link;
struct tipc_name_table;
struct tipc_topsrv;
struct tipc_monitor;
+#ifdef CONFIG_TIPC_CRYPTO
+struct tipc_crypto;
+#endif
#define TIPC_MOD_VER "2.0.0"
@@ -129,6 +132,11 @@ struct tipc_net {
/* Tracing of node internal messages */
struct packet_type loopback_pt;
+
+#ifdef CONFIG_TIPC_CRYPTO
+ /* TX crypto handler */
+ struct tipc_crypto *crypto_tx;
+#endif
};
static inline struct tipc_net *tipc_net(struct net *net)
diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c
new file mode 100644
index 000000000000..05f7ca76e8ce
--- /dev/null
+++ b/net/tipc/crypto.c
@@ -0,0 +1,1986 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * net/tipc/crypto.c: TIPC crypto for key handling & packet en/decryption
+ *
+ * Copyright (c) 2019, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <crypto/aead.h>
+#include <crypto/aes.h>
+#include "crypto.h"
+
+#define TIPC_TX_PROBE_LIM msecs_to_jiffies(1000) /* > 1s */
+#define TIPC_TX_LASTING_LIM msecs_to_jiffies(120000) /* 2 mins */
+#define TIPC_RX_ACTIVE_LIM msecs_to_jiffies(3000) /* 3s */
+#define TIPC_RX_PASSIVE_LIM msecs_to_jiffies(180000) /* 3 mins */
+#define TIPC_MAX_TFMS_DEF 10
+#define TIPC_MAX_TFMS_LIM 1000
+
+/**
+ * TIPC Key ids
+ */
+enum {
+ KEY_UNUSED = 0,
+ KEY_MIN,
+ KEY_1 = KEY_MIN,
+ KEY_2,
+ KEY_3,
+ KEY_MAX = KEY_3,
+};
+
+/**
+ * TIPC Crypto statistics
+ */
+enum {
+ STAT_OK,
+ STAT_NOK,
+ STAT_ASYNC,
+ STAT_ASYNC_OK,
+ STAT_ASYNC_NOK,
+ STAT_BADKEYS, /* tx only */
+ STAT_BADMSGS = STAT_BADKEYS, /* rx only */
+ STAT_NOKEYS,
+ STAT_SWITCHES,
+
+ MAX_STATS,
+};
+
+/* TIPC crypto statistics' header */
+static const char *hstats[MAX_STATS] = {"ok", "nok", "async", "async_ok",
+ "async_nok", "badmsgs", "nokeys",
+ "switches"};
+
+/* Max TFMs number per key */
+int sysctl_tipc_max_tfms __read_mostly = TIPC_MAX_TFMS_DEF;
+
+/**
+ * struct tipc_key - TIPC keys' status indicator
+ *
+ * 7 6 5 4 3 2 1 0
+ * +-----+-----+-----+-----+-----+-----+-----+-----+
+ * key: | (reserved)|passive idx| active idx|pending idx|
+ * +-----+-----+-----+-----+-----+-----+-----+-----+
+ */
+struct tipc_key {
+#define KEY_BITS (2)
+#define KEY_MASK ((1 << KEY_BITS) - 1)
+ union {
+ struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 pending:2,
+ active:2,
+ passive:2, /* rx only */
+ reserved:2;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u8 reserved:2,
+ passive:2, /* rx only */
+ active:2,
+ pending:2;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ } __packed;
+ u8 keys;
+ };
+};
+
+/**
+ * struct tipc_tfm - TIPC TFM structure to form a list of TFMs
+ */
+struct tipc_tfm {
+ struct crypto_aead *tfm;
+ struct list_head list;
+};
+
+/**
+ * struct tipc_aead - TIPC AEAD key structure
+ * @tfm_entry: per-cpu pointer to one entry in TFM list
+ * @crypto: TIPC crypto owns this key
+ * @cloned: reference to the source key in case cloning
+ * @users: the number of the key users (TX/RX)
+ * @salt: the key's SALT value
+ * @authsize: authentication tag size (max = 16)
+ * @mode: crypto mode is applied to the key
+ * @hint[]: a hint for user key
+ * @rcu: struct rcu_head
+ * @seqno: the key seqno (cluster scope)
+ * @refcnt: the key reference counter
+ */
+struct tipc_aead {
+#define TIPC_AEAD_HINT_LEN (5)
+ struct tipc_tfm * __percpu *tfm_entry;
+ struct tipc_crypto *crypto;
+ struct tipc_aead *cloned;
+ atomic_t users;
+ u32 salt;
+ u8 authsize;
+ u8 mode;
+ char hint[TIPC_AEAD_HINT_LEN + 1];
+ struct rcu_head rcu;
+
+ atomic64_t seqno ____cacheline_aligned;
+ refcount_t refcnt ____cacheline_aligned;
+
+} ____cacheline_aligned;
+
+/**
+ * struct tipc_crypto_stats - TIPC Crypto statistics
+ */
+struct tipc_crypto_stats {
+ unsigned int stat[MAX_STATS];
+};
+
+/**
+ * struct tipc_crypto - TIPC TX/RX crypto structure
+ * @net: struct net
+ * @node: TIPC node (RX)
+ * @aead: array of pointers to AEAD keys for encryption/decryption
+ * @peer_rx_active: replicated peer RX active key index
+ * @key: the key states
+ * @working: the crypto is working or not
+ * @stats: the crypto statistics
+ * @sndnxt: the per-peer sndnxt (TX)
+ * @timer1: general timer 1 (jiffies)
+ * @timer2: general timer 1 (jiffies)
+ * @lock: tipc_key lock
+ */
+struct tipc_crypto {
+ struct net *net;
+ struct tipc_node *node;
+ struct tipc_aead __rcu *aead[KEY_MAX + 1]; /* key[0] is UNUSED */
+ atomic_t peer_rx_active;
+ struct tipc_key key;
+ u8 working:1;
+ struct tipc_crypto_stats __percpu *stats;
+
+ atomic64_t sndnxt ____cacheline_aligned;
+ unsigned long timer1;
+ unsigned long timer2;
+ spinlock_t lock; /* crypto lock */
+
+} ____cacheline_aligned;
+
+/* struct tipc_crypto_tx_ctx - TX context for callbacks */
+struct tipc_crypto_tx_ctx {
+ struct tipc_aead *aead;
+ struct tipc_bearer *bearer;
+ struct tipc_media_addr dst;
+};
+
+/* struct tipc_crypto_rx_ctx - RX context for callbacks */
+struct tipc_crypto_rx_ctx {
+ struct tipc_aead *aead;
+ struct tipc_bearer *bearer;
+};
+
+static struct tipc_aead *tipc_aead_get(struct tipc_aead __rcu *aead);
+static inline void tipc_aead_put(struct tipc_aead *aead);
+static void tipc_aead_free(struct rcu_head *rp);
+static int tipc_aead_users(struct tipc_aead __rcu *aead);
+static void tipc_aead_users_inc(struct tipc_aead __rcu *aead, int lim);
+static void tipc_aead_users_dec(struct tipc_aead __rcu *aead, int lim);
+static void tipc_aead_users_set(struct tipc_aead __rcu *aead, int val);
+static struct crypto_aead *tipc_aead_tfm_next(struct tipc_aead *aead);
+static int tipc_aead_init(struct tipc_aead **aead, struct tipc_aead_key *ukey,
+ u8 mode);
+static int tipc_aead_clone(struct tipc_aead **dst, struct tipc_aead *src);
+static void *tipc_aead_mem_alloc(struct crypto_aead *tfm,
+ unsigned int crypto_ctx_size,
+ u8 **iv, struct aead_request **req,
+ struct scatterlist **sg, int nsg);
+static int tipc_aead_encrypt(struct tipc_aead *aead, struct sk_buff *skb,
+ struct tipc_bearer *b,
+ struct tipc_media_addr *dst,
+ struct tipc_node *__dnode);
+static void tipc_aead_encrypt_done(struct crypto_async_request *base, int err);
+static int tipc_aead_decrypt(struct net *net, struct tipc_aead *aead,
+ struct sk_buff *skb, struct tipc_bearer *b);
+static void tipc_aead_decrypt_done(struct crypto_async_request *base, int err);
+static inline int tipc_ehdr_size(struct tipc_ehdr *ehdr);
+static int tipc_ehdr_build(struct net *net, struct tipc_aead *aead,
+ u8 tx_key, struct sk_buff *skb,
+ struct tipc_crypto *__rx);
+static inline void tipc_crypto_key_set_state(struct tipc_crypto *c,
+ u8 new_passive,
+ u8 new_active,
+ u8 new_pending);
+static int tipc_crypto_key_attach(struct tipc_crypto *c,
+ struct tipc_aead *aead, u8 pos);
+static bool tipc_crypto_key_try_align(struct tipc_crypto *rx, u8 new_pending);
+static struct tipc_aead *tipc_crypto_key_pick_tx(struct tipc_crypto *tx,
+ struct tipc_crypto *rx,
+ struct sk_buff *skb);
+static void tipc_crypto_key_synch(struct tipc_crypto *rx, u8 new_rx_active,
+ struct tipc_msg *hdr);
+static int tipc_crypto_key_revoke(struct net *net, u8 tx_key);
+static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,
+ struct tipc_bearer *b,
+ struct sk_buff **skb, int err);
+static void tipc_crypto_do_cmd(struct net *net, int cmd);
+static char *tipc_crypto_key_dump(struct tipc_crypto *c, char *buf);
+#ifdef TIPC_CRYPTO_DEBUG
+static char *tipc_key_change_dump(struct tipc_key old, struct tipc_key new,
+ char *buf);
+#endif
+
+#define key_next(cur) ((cur) % KEY_MAX + 1)
+
+#define tipc_aead_rcu_ptr(rcu_ptr, lock) \
+ rcu_dereference_protected((rcu_ptr), lockdep_is_held(lock))
+
+#define tipc_aead_rcu_swap(rcu_ptr, ptr, lock) \
+ rcu_swap_protected((rcu_ptr), (ptr), lockdep_is_held(lock))
+
+#define tipc_aead_rcu_replace(rcu_ptr, ptr, lock) \
+do { \
+ typeof(rcu_ptr) __tmp = rcu_dereference_protected((rcu_ptr), \
+ lockdep_is_held(lock)); \
+ rcu_assign_pointer((rcu_ptr), (ptr)); \
+ tipc_aead_put(__tmp); \
+} while (0)
+
+#define tipc_crypto_key_detach(rcu_ptr, lock) \
+ tipc_aead_rcu_replace((rcu_ptr), NULL, lock)
+
+/**
+ * tipc_aead_key_validate - Validate a AEAD user key
+ */
+int tipc_aead_key_validate(struct tipc_aead_key *ukey)
+{
+ int keylen;
+
+ /* Check if algorithm exists */
+ if (unlikely(!crypto_has_alg(ukey->alg_name, 0, 0))) {
+ pr_info("Not found cipher: \"%s\"!\n", ukey->alg_name);
+ return -ENODEV;
+ }
+
+ /* Currently, we only support the "gcm(aes)" cipher algorithm */
+ if (strcmp(ukey->alg_name, "gcm(aes)"))
+ return -ENOTSUPP;
+
+ /* Check if key size is correct */
+ keylen = ukey->keylen - TIPC_AES_GCM_SALT_SIZE;
+ if (unlikely(keylen != TIPC_AES_GCM_KEY_SIZE_128 &&
+ keylen != TIPC_AES_GCM_KEY_SIZE_192 &&
+ keylen != TIPC_AES_GCM_KEY_SIZE_256))
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct tipc_aead *tipc_aead_get(struct tipc_aead __rcu *aead)
+{
+ struct tipc_aead *tmp;
+
+ rcu_read_lock();
+ tmp = rcu_dereference(aead);
+ if (unlikely(!tmp || !refcount_inc_not_zero(&tmp->refcnt)))
+ tmp = NULL;
+ rcu_read_unlock();
+
+ return tmp;
+}
+
+static inline void tipc_aead_put(struct tipc_aead *aead)
+{
+ if (aead && refcount_dec_and_test(&aead->refcnt))
+ call_rcu(&aead->rcu, tipc_aead_free);
+}
+
+/**
+ * tipc_aead_free - Release AEAD key incl. all the TFMs in the list
+ * @rp: rcu head pointer
+ */
+static void tipc_aead_free(struct rcu_head *rp)
+{
+ struct tipc_aead *aead = container_of(rp, struct tipc_aead, rcu);
+ struct tipc_tfm *tfm_entry, *head, *tmp;
+
+ if (aead->cloned) {
+ tipc_aead_put(aead->cloned);
+ } else {
+ head = *this_cpu_ptr(aead->tfm_entry);
+ list_for_each_entry_safe(tfm_entry, tmp, &head->list, list) {
+ crypto_free_aead(tfm_entry->tfm);
+ list_del(&tfm_entry->list);
+ kfree(tfm_entry);
+ }
+ /* Free the head */
+ crypto_free_aead(head->tfm);
+ list_del(&head->list);
+ kfree(head);
+ }
+ free_percpu(aead->tfm_entry);
+ kfree(aead);
+}
+
+static int tipc_aead_users(struct tipc_aead __rcu *aead)
+{
+ struct tipc_aead *tmp;
+ int users = 0;
+
+ rcu_read_lock();
+ tmp = rcu_dereference(aead);
+ if (tmp)
+ users = atomic_read(&tmp->users);
+ rcu_read_unlock();
+
+ return users;
+}
+
+static void tipc_aead_users_inc(struct tipc_aead __rcu *aead, int lim)
+{
+ struct tipc_aead *tmp;
+
+ rcu_read_lock();
+ tmp = rcu_dereference(aead);
+ if (tmp)
+ atomic_add_unless(&tmp->users, 1, lim);
+ rcu_read_unlock();
+}
+
+static void tipc_aead_users_dec(struct tipc_aead __rcu *aead, int lim)
+{
+ struct tipc_aead *tmp;
+
+ rcu_read_lock();
+ tmp = rcu_dereference(aead);
+ if (tmp)
+ atomic_add_unless(&rcu_dereference(aead)->users, -1, lim);
+ rcu_read_unlock();
+}
+
+static void tipc_aead_users_set(struct tipc_aead __rcu *aead, int val)
+{
+ struct tipc_aead *tmp;
+ int cur;
+
+ rcu_read_lock();
+ tmp = rcu_dereference(aead);
+ if (tmp) {
+ do {
+ cur = atomic_read(&tmp->users);
+ if (cur == val)
+ break;
+ } while (atomic_cmpxchg(&tmp->users, cur, val) != cur);
+ }
+ rcu_read_unlock();
+}
+
+/**
+ * tipc_aead_tfm_next - Move TFM entry to the next one in list and return it
+ */
+static struct crypto_aead *tipc_aead_tfm_next(struct tipc_aead *aead)
+{
+ struct tipc_tfm **tfm_entry = this_cpu_ptr(aead->tfm_entry);
+
+ *tfm_entry = list_next_entry(*tfm_entry, list);
+ return (*tfm_entry)->tfm;
+}
+
+/**
+ * tipc_aead_init - Initiate TIPC AEAD
+ * @aead: returned new TIPC AEAD key handle pointer
+ * @ukey: pointer to user key data
+ * @mode: the key mode
+ *
+ * Allocate a (list of) new cipher transformation (TFM) with the specific user
+ * key data if valid. The number of the allocated TFMs can be set via the sysfs
+ * "net/tipc/max_tfms" first.
+ * Also, all the other AEAD data are also initialized.
+ *
+ * Return: 0 if the initiation is successful, otherwise: < 0
+ */
+static int tipc_aead_init(struct tipc_aead **aead, struct tipc_aead_key *ukey,
+ u8 mode)
+{
+ struct tipc_tfm *tfm_entry, *head;
+ struct crypto_aead *tfm;
+ struct tipc_aead *tmp;
+ int keylen, err, cpu;
+ int tfm_cnt = 0;
+
+ if (unlikely(*aead))
+ return -EEXIST;
+
+ /* Allocate a new AEAD */
+ tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
+ if (unlikely(!tmp))
+ return -ENOMEM;
+
+ /* The key consists of two parts: [AES-KEY][SALT] */
+ keylen = ukey->keylen - TIPC_AES_GCM_SALT_SIZE;
+
+ /* Allocate per-cpu TFM entry pointer */
+ tmp->tfm_entry = alloc_percpu(struct tipc_tfm *);
+ if (!tmp->tfm_entry) {
+ kzfree(tmp);
+ return -ENOMEM;
+ }
+
+ /* Make a list of TFMs with the user key data */
+ do {
+ tfm = crypto_alloc_aead(ukey->alg_name, 0, 0);
+ if (IS_ERR(tfm)) {
+ err = PTR_ERR(tfm);
+ break;
+ }
+
+ if (unlikely(!tfm_cnt &&
+ crypto_aead_ivsize(tfm) != TIPC_AES_GCM_IV_SIZE)) {
+ crypto_free_aead(tfm);
+ err = -ENOTSUPP;
+ break;
+ }
+
+ err |= crypto_aead_setauthsize(tfm, TIPC_AES_GCM_TAG_SIZE);
+ err |= crypto_aead_setkey(tfm, ukey->key, keylen);
+ if (unlikely(err)) {
+ crypto_free_aead(tfm);
+ break;
+ }
+
+ tfm_entry = kmalloc(sizeof(*tfm_entry), GFP_KERNEL);
+ if (unlikely(!tfm_entry)) {
+ crypto_free_aead(tfm);
+ err = -ENOMEM;
+ break;
+ }
+ INIT_LIST_HEAD(&tfm_entry->list);
+ tfm_entry->tfm = tfm;
+
+ /* First entry? */
+ if (!tfm_cnt) {
+ head = tfm_entry;
+ for_each_possible_cpu(cpu) {
+ *per_cpu_ptr(tmp->tfm_entry, cpu) = head;
+ }
+ } else {
+ list_add_tail(&tfm_entry->list, &head->list);
+ }
+
+ } while (++tfm_cnt < sysctl_tipc_max_tfms);
+
+ /* Not any TFM is allocated? */
+ if (!tfm_cnt) {
+ free_percpu(tmp->tfm_entry);
+ kzfree(tmp);
+ return err;
+ }
+
+ /* Copy some chars from the user key as a hint */
+ memcpy(tmp->hint, ukey->key, TIPC_AEAD_HINT_LEN);
+ tmp->hint[TIPC_AEAD_HINT_LEN] = '\0';
+
+ /* Initialize the other data */
+ tmp->mode = mode;
+ tmp->cloned = NULL;
+ tmp->authsize = TIPC_AES_GCM_TAG_SIZE;
+ memcpy(&tmp->salt, ukey->key + keylen, TIPC_AES_GCM_SALT_SIZE);
+ atomic_set(&tmp->users, 0);
+ atomic64_set(&tmp->seqno, 0);
+ refcount_set(&tmp->refcnt, 1);
+
+ *aead = tmp;
+ return 0;
+}
+
+/**
+ * tipc_aead_clone - Clone a TIPC AEAD key
+ * @dst: dest key for the cloning
+ * @src: source key to clone from
+ *
+ * Make a "copy" of the source AEAD key data to the dest, the TFMs list is
+ * common for the keys.
+ * A reference to the source is hold in the "cloned" pointer for the later
+ * freeing purposes.
+ *
+ * Note: this must be done in cluster-key mode only!
+ * Return: 0 in case of success, otherwise < 0
+ */
+static int tipc_aead_clone(struct tipc_aead **dst, struct tipc_aead *src)
+{
+ struct tipc_aead *aead;
+ int cpu;
+
+ if (!src)
+ return -ENOKEY;
+
+ if (src->mode != CLUSTER_KEY)
+ return -EINVAL;
+
+ if (unlikely(*dst))
+ return -EEXIST;
+
+ aead = kzalloc(sizeof(*aead), GFP_ATOMIC);
+ if (unlikely(!aead))
+ return -ENOMEM;
+
+ aead->tfm_entry = alloc_percpu_gfp(struct tipc_tfm *, GFP_ATOMIC);
+ if (unlikely(!aead->tfm_entry)) {
+ kzfree(aead);
+ return -ENOMEM;
+ }
+
+ for_each_possible_cpu(cpu) {
+ *per_cpu_ptr(aead->tfm_entry, cpu) =
+ *per_cpu_ptr(src->tfm_entry, cpu);
+ }
+
+ memcpy(aead->hint, src->hint, sizeof(src->hint));
+ aead->mode = src->mode;
+ aead->salt = src->salt;
+ aead->authsize = src->authsize;
+ atomic_set(&aead->users, 0);
+ atomic64_set(&aead->seqno, 0);
+ refcount_set(&aead->refcnt, 1);
+
+ WARN_ON(!refcount_inc_not_zero(&src->refcnt));
+ aead->cloned = src;
+
+ *dst = aead;
+ return 0;
+}
+
+/**
+ * tipc_aead_mem_alloc - Allocate memory for AEAD request operations
+ * @tfm: cipher handle to be registered with the request
+ * @crypto_ctx_size: size of crypto context for callback
+ * @iv: returned pointer to IV data
+ * @req: returned pointer to AEAD request data
+ * @sg: returned pointer to SG lists
+ * @nsg: number of SG lists to be allocated
+ *
+ * Allocate memory to store the crypto context data, AEAD request, IV and SG
+ * lists, the memory layout is as follows:
+ * crypto_ctx || iv || aead_req || sg[]
+ *
+ * Return: the pointer to the memory areas in case of success, otherwise NULL
+ */
+static void *tipc_aead_mem_alloc(struct crypto_aead *tfm,
+ unsigned int crypto_ctx_size,
+ u8 **iv, struct aead_request **req,
+ struct scatterlist **sg, int nsg)
+{
+ unsigned int iv_size, req_size;
+ unsigned int len;
+ u8 *mem;
+
+ iv_size = crypto_aead_ivsize(tfm);
+ req_size = sizeof(**req) + crypto_aead_reqsize(tfm);
+
+ len = crypto_ctx_size;
+ len += iv_size;
+ len += crypto_aead_alignmask(tfm) & ~(crypto_tfm_ctx_alignment() - 1);
+ len = ALIGN(len, crypto_tfm_ctx_alignment());
+ len += req_size;
+ len = ALIGN(len, __alignof__(struct scatterlist));
+ len += nsg * sizeof(**sg);
+
+ mem = kmalloc(len, GFP_ATOMIC);
+ if (!mem)
+ return NULL;
+
+ *iv = (u8 *)PTR_ALIGN(mem + crypto_ctx_size,
+ crypto_aead_alignmask(tfm) + 1);
+ *req = (struct aead_request *)PTR_ALIGN(*iv + iv_size,
+ crypto_tfm_ctx_alignment());
+ *sg = (struct scatterlist *)PTR_ALIGN((u8 *)*req + req_size,
+ __alignof__(struct scatterlist));
+
+ return (void *)mem;
+}
+
+/**
+ * tipc_aead_encrypt - Encrypt a message
+ * @aead: TIPC AEAD key for the message encryption
+ * @skb: the input/output skb
+ * @b: TIPC bearer where the message will be delivered after the encryption
+ * @dst: the destination media address
+ * @__dnode: TIPC dest node if "known"
+ *
+ * Return:
+ * 0 : if the encryption has completed
+ * -EINPROGRESS/-EBUSY : if a callback will be performed
+ * < 0 : the encryption has failed
+ */
+static int tipc_aead_encrypt(struct tipc_aead *aead, struct sk_buff *skb,
+ struct tipc_bearer *b,
+ struct tipc_media_addr *dst,
+ struct tipc_node *__dnode)
+{
+ struct crypto_aead *tfm = tipc_aead_tfm_next(aead);
+ struct tipc_crypto_tx_ctx *tx_ctx;
+ struct aead_request *req;
+ struct sk_buff *trailer;
+ struct scatterlist *sg;
+ struct tipc_ehdr *ehdr;
+ int ehsz, len, tailen, nsg, rc;
+ void *ctx;
+ u32 salt;
+ u8 *iv;
+
+ /* Make sure message len at least 4-byte aligned */
+ len = ALIGN(skb->len, 4);
+ tailen = len - skb->len + aead->authsize;
+
+ /* Expand skb tail for authentication tag:
+ * As for simplicity, we'd have made sure skb having enough tailroom
+ * for authentication tag @skb allocation. Even when skb is nonlinear
+ * but there is no frag_list, it should be still fine!
+ * Otherwise, we must cow it to be a writable buffer with the tailroom.
+ */
+#ifdef TIPC_CRYPTO_DEBUG
+ SKB_LINEAR_ASSERT(skb);
+ if (tailen > skb_tailroom(skb)) {
+ pr_warn("TX: skb tailroom is not enough: %d, requires: %d\n",
+ skb_tailroom(skb), tailen);
+ }
+#endif
+
+ if (unlikely(!skb_cloned(skb) && tailen <= skb_tailroom(skb))) {
+ nsg = 1;
+ trailer = skb;
+ } else {
+ /* TODO: We could avoid skb_cow_data() if skb has no frag_list
+ * e.g. by skb_fill_page_desc() to add another page to the skb
+ * with the wanted tailen... However, page skbs look not often,
+ * so take it easy now!
+ * Cloned skbs e.g. from link_xmit() seems no choice though :(
+ */
+ nsg = skb_cow_data(skb, tailen, &trailer);
+ if (unlikely(nsg < 0)) {
+ pr_err("TX: skb_cow_data() returned %d\n", nsg);
+ return nsg;
+ }
+ }
+
+ pskb_put(skb, trailer, tailen);
+
+ /* Allocate memory for the AEAD operation */
+ ctx = tipc_aead_mem_alloc(tfm, sizeof(*tx_ctx), &iv, &req, &sg, nsg);
+ if (unlikely(!ctx))
+ return -ENOMEM;
+ TIPC_SKB_CB(skb)->crypto_ctx = ctx;
+
+ /* Map skb to the sg lists */
+ sg_init_table(sg, nsg);
+ rc = skb_to_sgvec(skb, sg, 0, skb->len);
+ if (unlikely(rc < 0)) {
+ pr_err("TX: skb_to_sgvec() returned %d, nsg %d!\n", rc, nsg);
+ goto exit;
+ }
+
+ /* Prepare IV: [SALT (4 octets)][SEQNO (8 octets)]
+ * In case we're in cluster-key mode, SALT is varied by xor-ing with
+ * the source address (or w0 of id), otherwise with the dest address
+ * if dest is known.
+ */
+ ehdr = (struct tipc_ehdr *)skb->data;
+ salt = aead->salt;
+ if (aead->mode == CLUSTER_KEY)
+ salt ^= ehdr->addr; /* __be32 */
+ else if (__dnode)
+ salt ^= tipc_node_get_addr(__dnode);
+ memcpy(iv, &salt, 4);
+ memcpy(iv + 4, (u8 *)&ehdr->seqno, 8);
+
+ /* Prepare request */
+ ehsz = tipc_ehdr_size(ehdr);
+ aead_request_set_tfm(req, tfm);
+ aead_request_set_ad(req, ehsz);
+ aead_request_set_crypt(req, sg, sg, len - ehsz, iv);
+
+ /* Set callback function & data */
+ aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+ tipc_aead_encrypt_done, skb);
+ tx_ctx = (struct tipc_crypto_tx_ctx *)ctx;
+ tx_ctx->aead = aead;
+ tx_ctx->bearer = b;
+ memcpy(&tx_ctx->dst, dst, sizeof(*dst));
+
+ /* Hold bearer */
+ if (unlikely(!tipc_bearer_hold(b))) {
+ rc = -ENODEV;
+ goto exit;
+ }
+
+ /* Now, do encrypt */
+ rc = crypto_aead_encrypt(req);
+ if (rc == -EINPROGRESS || rc == -EBUSY)
+ return rc;
+
+ tipc_bearer_put(b);
+
+exit:
+ kfree(ctx);
+ TIPC_SKB_CB(skb)->crypto_ctx = NULL;
+ return rc;
+}
+
+static void tipc_aead_encrypt_done(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+ struct tipc_crypto_tx_ctx *tx_ctx = TIPC_SKB_CB(skb)->crypto_ctx;
+ struct tipc_bearer *b = tx_ctx->bearer;
+ struct tipc_aead *aead = tx_ctx->aead;
+ struct tipc_crypto *tx = aead->crypto;
+ struct net *net = tx->net;
+
+ switch (err) {
+ case 0:
+ this_cpu_inc(tx->stats->stat[STAT_ASYNC_OK]);
+ if (likely(test_bit(0, &b->up)))
+ b->media->send_msg(net, skb, b, &tx_ctx->dst);
+ else
+ kfree_skb(skb);
+ break;
+ case -EINPROGRESS:
+ return;
+ default:
+ this_cpu_inc(tx->stats->stat[STAT_ASYNC_NOK]);
+ kfree_skb(skb);
+ break;
+ }
+
+ kfree(tx_ctx);
+ tipc_bearer_put(b);
+ tipc_aead_put(aead);
+}
+
+/**
+ * tipc_aead_decrypt - Decrypt an encrypted message
+ * @net: struct net
+ * @aead: TIPC AEAD for the message decryption
+ * @skb: the input/output skb
+ * @b: TIPC bearer where the message has been received
+ *
+ * Return:
+ * 0 : if the decryption has completed
+ * -EINPROGRESS/-EBUSY : if a callback will be performed
+ * < 0 : the decryption has failed
+ */
+static int tipc_aead_decrypt(struct net *net, struct tipc_aead *aead,
+ struct sk_buff *skb, struct tipc_bearer *b)
+{
+ struct tipc_crypto_rx_ctx *rx_ctx;
+ struct aead_request *req;
+ struct crypto_aead *tfm;
+ struct sk_buff *unused;
+ struct scatterlist *sg;
+ struct tipc_ehdr *ehdr;
+ int ehsz, nsg, rc;
+ void *ctx;
+ u32 salt;
+ u8 *iv;
+
+ if (unlikely(!aead))
+ return -ENOKEY;
+
+ /* Cow skb data if needed */
+ if (likely(!skb_cloned(skb) &&
+ (!skb_is_nonlinear(skb) || !skb_has_frag_list(skb)))) {
+ nsg = 1 + skb_shinfo(skb)->nr_frags;
+ } else {
+ nsg = skb_cow_data(skb, 0, &unused);
+ if (unlikely(nsg < 0)) {
+ pr_err("RX: skb_cow_data() returned %d\n", nsg);
+ return nsg;
+ }
+ }
+
+ /* Allocate memory for the AEAD operation */
+ tfm = tipc_aead_tfm_next(aead);
+ ctx = tipc_aead_mem_alloc(tfm, sizeof(*rx_ctx), &iv, &req, &sg, nsg);
+ if (unlikely(!ctx))
+ return -ENOMEM;
+ TIPC_SKB_CB(skb)->crypto_ctx = ctx;
+
+ /* Map skb to the sg lists */
+ sg_init_table(sg, nsg);
+ rc = skb_to_sgvec(skb, sg, 0, skb->len);
+ if (unlikely(rc < 0)) {
+ pr_err("RX: skb_to_sgvec() returned %d, nsg %d\n", rc, nsg);
+ goto exit;
+ }
+
+ /* Reconstruct IV: */
+ ehdr = (struct tipc_ehdr *)skb->data;
+ salt = aead->salt;
+ if (aead->mode == CLUSTER_KEY)
+ salt ^= ehdr->addr; /* __be32 */
+ else if (ehdr->destined)
+ salt ^= tipc_own_addr(net);
+ memcpy(iv, &salt, 4);
+ memcpy(iv + 4, (u8 *)&ehdr->seqno, 8);
+
+ /* Prepare request */
+ ehsz = tipc_ehdr_size(ehdr);
+ aead_request_set_tfm(req, tfm);
+ aead_request_set_ad(req, ehsz);
+ aead_request_set_crypt(req, sg, sg, skb->len - ehsz, iv);
+
+ /* Set callback function & data */
+ aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+ tipc_aead_decrypt_done, skb);
+ rx_ctx = (struct tipc_crypto_rx_ctx *)ctx;
+ rx_ctx->aead = aead;
+ rx_ctx->bearer = b;
+
+ /* Hold bearer */
+ if (unlikely(!tipc_bearer_hold(b))) {
+ rc = -ENODEV;
+ goto exit;
+ }
+
+ /* Now, do decrypt */
+ rc = crypto_aead_decrypt(req);
+ if (rc == -EINPROGRESS || rc == -EBUSY)
+ return rc;
+
+ tipc_bearer_put(b);
+
+exit:
+ kfree(ctx);
+ TIPC_SKB_CB(skb)->crypto_ctx = NULL;
+ return rc;
+}
+
+static void tipc_aead_decrypt_done(struct crypto_async_request *base, int err)
+{
+ struct sk_buff *skb = base->data;
+ struct tipc_crypto_rx_ctx *rx_ctx = TIPC_SKB_CB(skb)->crypto_ctx;
+ struct tipc_bearer *b = rx_ctx->bearer;
+ struct tipc_aead *aead = rx_ctx->aead;
+ struct tipc_crypto_stats __percpu *stats = aead->crypto->stats;
+ struct net *net = aead->crypto->net;
+
+ switch (err) {
+ case 0:
+ this_cpu_inc(stats->stat[STAT_ASYNC_OK]);
+ break;
+ case -EINPROGRESS:
+ return;
+ default:
+ this_cpu_inc(stats->stat[STAT_ASYNC_NOK]);
+ break;
+ }
+
+ kfree(rx_ctx);
+ tipc_crypto_rcv_complete(net, aead, b, &skb, err);
+ if (likely(skb)) {
+ if (likely(test_bit(0, &b->up)))
+ tipc_rcv(net, skb, b);
+ else
+ kfree_skb(skb);
+ }
+
+ tipc_bearer_put(b);
+}
+
+static inline int tipc_ehdr_size(struct tipc_ehdr *ehdr)
+{
+ return (ehdr->user != LINK_CONFIG) ? EHDR_SIZE : EHDR_CFG_SIZE;
+}
+
+/**
+ * tipc_ehdr_validate - Validate an encryption message
+ * @skb: the message buffer
+ *
+ * Returns "true" if this is a valid encryption message, otherwise "false"
+ */
+bool tipc_ehdr_validate(struct sk_buff *skb)
+{
+ struct tipc_ehdr *ehdr;
+ int ehsz;
+
+ if (unlikely(!pskb_may_pull(skb, EHDR_MIN_SIZE)))
+ return false;
+
+ ehdr = (struct tipc_ehdr *)skb->data;
+ if (unlikely(ehdr->version != TIPC_EVERSION))
+ return false;
+ ehsz = tipc_ehdr_size(ehdr);
+ if (unlikely(!pskb_may_pull(skb, ehsz)))
+ return false;
+ if (unlikely(skb->len <= ehsz + TIPC_AES_GCM_TAG_SIZE))
+ return false;
+ if (unlikely(!ehdr->tx_key))
+ return false;
+
+ return true;
+}
+
+/**
+ * tipc_ehdr_build - Build TIPC encryption message header
+ * @net: struct net
+ * @aead: TX AEAD key to be used for the message encryption
+ * @tx_key: key id used for the message encryption
+ * @skb: input/output message skb
+ * @__rx: RX crypto handle if dest is "known"
+ *
+ * Return: the header size if the building is successful, otherwise < 0
+ */
+static int tipc_ehdr_build(struct net *net, struct tipc_aead *aead,
+ u8 tx_key, struct sk_buff *skb,
+ struct tipc_crypto *__rx)
+{
+ struct tipc_msg *hdr = buf_msg(skb);
+ struct tipc_ehdr *ehdr;
+ u32 user = msg_user(hdr);
+ u64 seqno;
+ int ehsz;
+
+ /* Make room for encryption header */
+ ehsz = (user != LINK_CONFIG) ? EHDR_SIZE : EHDR_CFG_SIZE;
+ WARN_ON(skb_headroom(skb) < ehsz);
+ ehdr = (struct tipc_ehdr *)skb_push(skb, ehsz);
+
+ /* Obtain a seqno first:
+ * Use the key seqno (= cluster wise) if dest is unknown or we're in
+ * cluster key mode, otherwise it's better for a per-peer seqno!
+ */
+ if (!__rx || aead->mode == CLUSTER_KEY)
+ seqno = atomic64_inc_return(&aead->seqno);
+ else
+ seqno = atomic64_inc_return(&__rx->sndnxt);
+
+ /* Revoke the key if seqno is wrapped around */
+ if (unlikely(!seqno))
+ return tipc_crypto_key_revoke(net, tx_key);
+
+ /* Word 1-2 */
+ ehdr->seqno = cpu_to_be64(seqno);
+
+ /* Words 0, 3- */
+ ehdr->version = TIPC_EVERSION;
+ ehdr->user = 0;
+ ehdr->keepalive = 0;
+ ehdr->tx_key = tx_key;
+ ehdr->destined = (__rx) ? 1 : 0;
+ ehdr->rx_key_active = (__rx) ? __rx->key.active : 0;
+ ehdr->reserved_1 = 0;
+ ehdr->reserved_2 = 0;
+
+ switch (user) {
+ case LINK_CONFIG:
+ ehdr->user = LINK_CONFIG;
+ memcpy(ehdr->id, tipc_own_id(net), NODE_ID_LEN);
+ break;
+ default:
+ if (user == LINK_PROTOCOL && msg_type(hdr) == STATE_MSG) {
+ ehdr->user = LINK_PROTOCOL;
+ ehdr->keepalive = msg_is_keepalive(hdr);
+ }
+ ehdr->addr = hdr->hdr[3];
+ break;
+ }
+
+ return ehsz;
+}
+
+static inline void tipc_crypto_key_set_state(struct tipc_crypto *c,
+ u8 new_passive,
+ u8 new_active,
+ u8 new_pending)
+{
+#ifdef TIPC_CRYPTO_DEBUG
+ struct tipc_key old = c->key;
+ char buf[32];
+#endif
+
+ c->key.keys = ((new_passive & KEY_MASK) << (KEY_BITS * 2)) |
+ ((new_active & KEY_MASK) << (KEY_BITS)) |
+ ((new_pending & KEY_MASK));
+
+#ifdef TIPC_CRYPTO_DEBUG
+ pr_info("%s(%s): key changing %s ::%pS\n",
+ (c->node) ? "RX" : "TX",
+ (c->node) ? tipc_node_get_id_str(c->node) :
+ tipc_own_id_string(c->net),
+ tipc_key_change_dump(old, c->key, buf),
+ __builtin_return_address(0));
+#endif
+}
+
+/**
+ * tipc_crypto_key_init - Initiate a new user / AEAD key
+ * @c: TIPC crypto to which new key is attached
+ * @ukey: the user key
+ * @mode: the key mode (CLUSTER_KEY or PER_NODE_KEY)
+ *
+ * A new TIPC AEAD key will be allocated and initiated with the specified user
+ * key, then attached to the TIPC crypto.
+ *
+ * Return: new key id in case of success, otherwise: < 0
+ */
+int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey,
+ u8 mode)
+{
+ struct tipc_aead *aead = NULL;
+ int rc = 0;
+
+ /* Initiate with the new user key */
+ rc = tipc_aead_init(&aead, ukey, mode);
+
+ /* Attach it to the crypto */
+ if (likely(!rc)) {
+ rc = tipc_crypto_key_attach(c, aead, 0);
+ if (rc < 0)
+ tipc_aead_free(&aead->rcu);
+ }
+
+ pr_info("%s(%s): key initiating, rc %d!\n",
+ (c->node) ? "RX" : "TX",
+ (c->node) ? tipc_node_get_id_str(c->node) :
+ tipc_own_id_string(c->net),
+ rc);
+
+ return rc;
+}
+
+/**
+ * tipc_crypto_key_attach - Attach a new AEAD key to TIPC crypto
+ * @c: TIPC crypto to which the new AEAD key is attached
+ * @aead: the new AEAD key pointer
+ * @pos: desired slot in the crypto key array, = 0 if any!
+ *
+ * Return: new key id in case of success, otherwise: -EBUSY
+ */
+static int tipc_crypto_key_attach(struct tipc_crypto *c,
+ struct tipc_aead *aead, u8 pos)
+{
+ u8 new_pending, new_passive, new_key;
+ struct tipc_key key;
+ int rc = -EBUSY;
+
+ spin_lock_bh(&c->lock);
+ key = c->key;
+ if (key.active && key.passive)
+ goto exit;
+ if (key.passive && !tipc_aead_users(c->aead[key.passive]))
+ goto exit;
+ if (key.pending) {
+ if (pos)
+ goto exit;
+ if (tipc_aead_users(c->aead[key.pending]) > 0)
+ goto exit;
+ /* Replace it */
+ new_pending = key.pending;
+ new_passive = key.passive;
+ new_key = new_pending;
+ } else {
+ if (pos) {
+ if (key.active && pos != key_next(key.active)) {
+ new_pending = key.pending;
+ new_passive = pos;
+ new_key = new_passive;
+ goto attach;
+ } else if (!key.active && !key.passive) {
+ new_pending = pos;
+ new_passive = key.passive;
+ new_key = new_pending;
+ goto attach;
+ }
+ }
+ new_pending = key_next(key.active ?: key.passive);
+ new_passive = key.passive;
+ new_key = new_pending;
+ }
+
+attach:
+ aead->crypto = c;
+ tipc_crypto_key_set_state(c, new_passive, key.active, new_pending);
+ tipc_aead_rcu_replace(c->aead[new_key], aead, &c->lock);
+
+ c->working = 1;
+ c->timer1 = jiffies;
+ c->timer2 = jiffies;
+ rc = new_key;
+
+exit:
+ spin_unlock_bh(&c->lock);
+ return rc;
+}
+
+void tipc_crypto_key_flush(struct tipc_crypto *c)
+{
+ int k;
+
+ spin_lock_bh(&c->lock);
+ c->working = 0;
+ tipc_crypto_key_set_state(c, 0, 0, 0);
+ for (k = KEY_MIN; k <= KEY_MAX; k++)
+ tipc_crypto_key_detach(c->aead[k], &c->lock);
+ atomic_set(&c->peer_rx_active, 0);
+ atomic64_set(&c->sndnxt, 0);
+ spin_unlock_bh(&c->lock);
+}
+
+/**
+ * tipc_crypto_key_try_align - Align RX keys if possible
+ * @rx: RX crypto handle
+ * @new_pending: new pending slot if aligned (= TX key from peer)
+ *
+ * Peer has used an unknown key slot, this only happens when peer has left and
+ * rejoned, or we are newcomer.
+ * That means, there must be no active key but a pending key at unaligned slot.
+ * If so, we try to move the pending key to the new slot.
+ * Note: A potential passive key can exist, it will be shifted correspondingly!
+ *
+ * Return: "true" if key is successfully aligned, otherwise "false"
+ */
+static bool tipc_crypto_key_try_align(struct tipc_crypto *rx, u8 new_pending)
+{
+ struct tipc_aead *tmp1, *tmp2 = NULL;
+ struct tipc_key key;
+ bool aligned = false;
+ u8 new_passive = 0;
+ int x;
+
+ spin_lock(&rx->lock);
+ key = rx->key;
+ if (key.pending == new_pending) {
+ aligned = true;
+ goto exit;
+ }
+ if (key.active)
+ goto exit;
+ if (!key.pending)
+ goto exit;
+ if (tipc_aead_users(rx->aead[key.pending]) > 0)
+ goto exit;
+
+ /* Try to "isolate" this pending key first */
+ tmp1 = tipc_aead_rcu_ptr(rx->aead[key.pending], &rx->lock);
+ if (!refcount_dec_if_one(&tmp1->refcnt))
+ goto exit;
+ rcu_assign_pointer(rx->aead[key.pending], NULL);
+
+ /* Move passive key if any */
+ if (key.passive) {
+ tipc_aead_rcu_swap(rx->aead[key.passive], tmp2, &rx->lock);
+ x = (key.passive - key.pending + new_pending) % KEY_MAX;
+ new_passive = (x <= 0) ? x + KEY_MAX : x;
+ }
+
+ /* Re-allocate the key(s) */
+ tipc_crypto_key_set_state(rx, new_passive, 0, new_pending);
+ rcu_assign_pointer(rx->aead[new_pending], tmp1);
+ if (new_passive)
+ rcu_assign_pointer(rx->aead[new_passive], tmp2);
+ refcount_set(&tmp1->refcnt, 1);
+ aligned = true;
+ pr_info("RX(%s): key is aligned!\n", tipc_node_get_id_str(rx->node));
+
+exit:
+ spin_unlock(&rx->lock);
+ return aligned;
+}
+
+/**
+ * tipc_crypto_key_pick_tx - Pick one TX key for message decryption
+ * @tx: TX crypto handle
+ * @rx: RX crypto handle (can be NULL)
+ * @skb: the message skb which will be decrypted later
+ *
+ * This function looks up the existing TX keys and pick one which is suitable
+ * for the message decryption, that must be a cluster key and not used before
+ * on the same message (i.e. recursive).
+ *
+ * Return: the TX AEAD key handle in case of success, otherwise NULL
+ */
+static struct tipc_aead *tipc_crypto_key_pick_tx(struct tipc_crypto *tx,
+ struct tipc_crypto *rx,
+ struct sk_buff *skb)
+{
+ struct tipc_skb_cb *skb_cb = TIPC_SKB_CB(skb);
+ struct tipc_aead *aead = NULL;
+ struct tipc_key key = tx->key;
+ u8 k, i = 0;
+
+ /* Initialize data if not yet */
+ if (!skb_cb->tx_clone_deferred) {
+ skb_cb->tx_clone_deferred = 1;
+ memset(&skb_cb->tx_clone_ctx, 0, sizeof(skb_cb->tx_clone_ctx));
+ }
+
+ skb_cb->tx_clone_ctx.rx = rx;
+ if (++skb_cb->tx_clone_ctx.recurs > 2)
+ return NULL;
+
+ /* Pick one TX key */
+ spin_lock(&tx->lock);
+ do {
+ k = (i == 0) ? key.pending :
+ ((i == 1) ? key.active : key.passive);
+ if (!k)
+ continue;
+ aead = tipc_aead_rcu_ptr(tx->aead[k], &tx->lock);
+ if (!aead)
+ continue;
+ if (aead->mode != CLUSTER_KEY ||
+ aead == skb_cb->tx_clone_ctx.last) {
+ aead = NULL;
+ continue;
+ }
+ /* Ok, found one cluster key */
+ skb_cb->tx_clone_ctx.last = aead;
+ WARN_ON(skb->next);
+ skb->next = skb_clone(skb, GFP_ATOMIC);
+ if (unlikely(!skb->next))
+ pr_warn("Failed to clone skb for next round if any\n");
+ WARN_ON(!refcount_inc_not_zero(&aead->refcnt));
+ break;
+ } while (++i < 3);
+ spin_unlock(&tx->lock);
+
+ return aead;
+}
+
+/**
+ * tipc_crypto_key_synch: Synch own key data according to peer key status
+ * @rx: RX crypto handle
+ * @new_rx_active: latest RX active key from peer
+ * @hdr: TIPCv2 message
+ *
+ * This function updates the peer node related data as the peer RX active key
+ * has changed, so the number of TX keys' users on this node are increased and
+ * decreased correspondingly.
+ *
+ * The "per-peer" sndnxt is also reset when the peer key has switched.
+ */
+static void tipc_crypto_key_synch(struct tipc_crypto *rx, u8 new_rx_active,
+ struct tipc_msg *hdr)
+{
+ struct net *net = rx->net;
+ struct tipc_crypto *tx = tipc_net(net)->crypto_tx;
+ u8 cur_rx_active;
+
+ /* TX might be even not ready yet */
+ if (unlikely(!tx->key.active && !tx->key.pending))
+ return;
+
+ cur_rx_active = atomic_read(&rx->peer_rx_active);
+ if (likely(cur_rx_active == new_rx_active))
+ return;
+
+ /* Make sure this message destined for this node */
+ if (unlikely(msg_short(hdr) ||
+ msg_destnode(hdr) != tipc_own_addr(net)))
+ return;
+
+ /* Peer RX active key has changed, try to update owns' & TX users */
+ if (atomic_cmpxchg(&rx->peer_rx_active,
+ cur_rx_active,
+ new_rx_active) == cur_rx_active) {
+ if (new_rx_active)
+ tipc_aead_users_inc(tx->aead[new_rx_active], INT_MAX);
+ if (cur_rx_active)
+ tipc_aead_users_dec(tx->aead[cur_rx_active], 0);
+
+ atomic64_set(&rx->sndnxt, 0);
+ /* Mark the point TX key users changed */
+ tx->timer1 = jiffies;
+
+#ifdef TIPC_CRYPTO_DEBUG
+ pr_info("TX(%s): key users changed %d-- %d++, peer RX(%s)\n",
+ tipc_own_id_string(net), cur_rx_active,
+ new_rx_active, tipc_node_get_id_str(rx->node));
+#endif
+ }
+}
+
+static int tipc_crypto_key_revoke(struct net *net, u8 tx_key)
+{
+ struct tipc_crypto *tx = tipc_net(net)->crypto_tx;
+ struct tipc_key key;
+
+ spin_lock(&tx->lock);
+ key = tx->key;
+ WARN_ON(!key.active || tx_key != key.active);
+
+ /* Free the active key */
+ tipc_crypto_key_set_state(tx, key.passive, 0, key.pending);
+ tipc_crypto_key_detach(tx->aead[key.active], &tx->lock);
+ spin_unlock(&tx->lock);
+
+ pr_warn("TX(%s): key is revoked!\n", tipc_own_id_string(net));
+ return -EKEYREVOKED;
+}
+
+int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net,
+ struct tipc_node *node)
+{
+ struct tipc_crypto *c;
+
+ if (*crypto)
+ return -EEXIST;
+
+ /* Allocate crypto */
+ c = kzalloc(sizeof(*c), GFP_ATOMIC);
+ if (!c)
+ return -ENOMEM;
+
+ /* Allocate statistic structure */
+ c->stats = alloc_percpu_gfp(struct tipc_crypto_stats, GFP_ATOMIC);
+ if (!c->stats) {
+ kzfree(c);
+ return -ENOMEM;
+ }
+
+ c->working = 0;
+ c->net = net;
+ c->node = node;
+ tipc_crypto_key_set_state(c, 0, 0, 0);
+ atomic_set(&c->peer_rx_active, 0);
+ atomic64_set(&c->sndnxt, 0);
+ c->timer1 = jiffies;
+ c->timer2 = jiffies;
+ spin_lock_init(&c->lock);
+ *crypto = c;
+
+ return 0;
+}
+
+void tipc_crypto_stop(struct tipc_crypto **crypto)
+{
+ struct tipc_crypto *c, *tx, *rx;
+ bool is_rx;
+ u8 k;
+
+ if (!*crypto)
+ return;
+
+ rcu_read_lock();
+ /* RX stopping? => decrease TX key users if any */
+ is_rx = !!((*crypto)->node);
+ if (is_rx) {
+ rx = *crypto;
+ tx = tipc_net(rx->net)->crypto_tx;
+ k = atomic_read(&rx->peer_rx_active);
+ if (k) {
+ tipc_aead_users_dec(tx->aead[k], 0);
+ /* Mark the point TX key users changed */
+ tx->timer1 = jiffies;
+ }
+ }
+
+ /* Release AEAD keys */
+ c = *crypto;
+ for (k = KEY_MIN; k <= KEY_MAX; k++)
+ tipc_aead_put(rcu_dereference(c->aead[k]));
+ rcu_read_unlock();
+
+ pr_warn("%s(%s) has been purged, node left!\n",
+ (is_rx) ? "RX" : "TX",
+ (is_rx) ? tipc_node_get_id_str((*crypto)->node) :
+ tipc_own_id_string((*crypto)->net));
+
+ /* Free this crypto statistics */
+ free_percpu(c->stats);
+
+ *crypto = NULL;
+ kzfree(c);
+}
+
+void tipc_crypto_timeout(struct tipc_crypto *rx)
+{
+ struct tipc_net *tn = tipc_net(rx->net);
+ struct tipc_crypto *tx = tn->crypto_tx;
+ struct tipc_key key;
+ u8 new_pending, new_passive;
+ int cmd;
+
+ /* TX key activating:
+ * The pending key (users > 0) -> active
+ * The active key if any (users == 0) -> free
+ */
+ spin_lock(&tx->lock);
+ key = tx->key;
+ if (key.active && tipc_aead_users(tx->aead[key.active]) > 0)
+ goto s1;
+ if (!key.pending || tipc_aead_users(tx->aead[key.pending]) <= 0)
+ goto s1;
+ if (time_before(jiffies, tx->timer1 + TIPC_TX_LASTING_LIM))
+ goto s1;
+
+ tipc_crypto_key_set_state(tx, key.passive, key.pending, 0);
+ if (key.active)
+ tipc_crypto_key_detach(tx->aead[key.active], &tx->lock);
+ this_cpu_inc(tx->stats->stat[STAT_SWITCHES]);
+ pr_info("TX(%s): key %d is activated!\n", tipc_own_id_string(tx->net),
+ key.pending);
+
+s1:
+ spin_unlock(&tx->lock);
+
+ /* RX key activating:
+ * The pending key (users > 0) -> active
+ * The active key if any -> passive, freed later
+ */
+ spin_lock(&rx->lock);
+ key = rx->key;
+ if (!key.pending || tipc_aead_users(rx->aead[key.pending]) <= 0)
+ goto s2;
+
+ new_pending = (key.passive &&
+ !tipc_aead_users(rx->aead[key.passive])) ?
+ key.passive : 0;
+ new_passive = (key.active) ?: ((new_pending) ? 0 : key.passive);
+ tipc_crypto_key_set_state(rx, new_passive, key.pending, new_pending);
+ this_cpu_inc(rx->stats->stat[STAT_SWITCHES]);
+ pr_info("RX(%s): key %d is activated!\n",
+ tipc_node_get_id_str(rx->node), key.pending);
+ goto s5;
+
+s2:
+ /* RX key "faulty" switching:
+ * The faulty pending key (users < -30) -> passive
+ * The passive key (users = 0) -> pending
+ * Note: This only happens after RX deactivated - s3!
+ */
+ key = rx->key;
+ if (!key.pending || tipc_aead_users(rx->aead[key.pending]) > -30)
+ goto s3;
+ if (!key.passive || tipc_aead_users(rx->aead[key.passive]) != 0)
+ goto s3;
+
+ new_pending = key.passive;
+ new_passive = key.pending;
+ tipc_crypto_key_set_state(rx, new_passive, key.active, new_pending);
+ goto s5;
+
+s3:
+ /* RX key deactivating:
+ * The passive key if any -> pending
+ * The active key -> passive (users = 0) / pending
+ * The pending key if any -> passive (users = 0)
+ */
+ key = rx->key;
+ if (!key.active)
+ goto s4;
+ if (time_before(jiffies, rx->timer1 + TIPC_RX_ACTIVE_LIM))
+ goto s4;
+
+ new_pending = (key.passive) ?: key.active;
+ new_passive = (key.passive) ? key.active : key.pending;
+ tipc_aead_users_set(rx->aead[new_pending], 0);
+ if (new_passive)
+ tipc_aead_users_set(rx->aead[new_passive], 0);
+ tipc_crypto_key_set_state(rx, new_passive, 0, new_pending);
+ pr_info("RX(%s): key %d is deactivated!\n",
+ tipc_node_get_id_str(rx->node), key.active);
+ goto s5;
+
+s4:
+ /* RX key passive -> freed: */
+ key = rx->key;
+ if (!key.passive || !tipc_aead_users(rx->aead[key.passive]))
+ goto s5;
+ if (time_before(jiffies, rx->timer2 + TIPC_RX_PASSIVE_LIM))
+ goto s5;
+
+ tipc_crypto_key_set_state(rx, 0, key.active, key.pending);
+ tipc_crypto_key_detach(rx->aead[key.passive], &rx->lock);
+ pr_info("RX(%s): key %d is freed!\n", tipc_node_get_id_str(rx->node),
+ key.passive);
+
+s5:
+ spin_unlock(&rx->lock);
+
+ /* Limit max_tfms & do debug commands if needed */
+ if (likely(sysctl_tipc_max_tfms <= TIPC_MAX_TFMS_LIM))
+ return;
+
+ cmd = sysctl_tipc_max_tfms;
+ sysctl_tipc_max_tfms = TIPC_MAX_TFMS_DEF;
+ tipc_crypto_do_cmd(rx->net, cmd);
+}
+
+/**
+ * tipc_crypto_xmit - Build & encrypt TIPC message for xmit
+ * @net: struct net
+ * @skb: input/output message skb pointer
+ * @b: bearer used for xmit later
+ * @dst: destination media address
+ * @__dnode: destination node for reference if any
+ *
+ * First, build an encryption message header on the top of the message, then
+ * encrypt the original TIPC message by using the active or pending TX key.
+ * If the encryption is successful, the encrypted skb is returned directly or
+ * via the callback.
+ * Otherwise, the skb is freed!
+ *
+ * Return:
+ * 0 : the encryption has succeeded (or no encryption)
+ * -EINPROGRESS/-EBUSY : the encryption is ongoing, a callback will be made
+ * -ENOKEK : the encryption has failed due to no key
+ * -EKEYREVOKED : the encryption has failed due to key revoked
+ * -ENOMEM : the encryption has failed due to no memory
+ * < 0 : the encryption has failed due to other reasons
+ */
+int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,
+ struct tipc_bearer *b, struct tipc_media_addr *dst,
+ struct tipc_node *__dnode)
+{
+ struct tipc_crypto *__rx = tipc_node_crypto_rx(__dnode);
+ struct tipc_crypto *tx = tipc_net(net)->crypto_tx;
+ struct tipc_crypto_stats __percpu *stats = tx->stats;
+ struct tipc_key key = tx->key;
+ struct tipc_aead *aead = NULL;
+ struct sk_buff *probe;
+ int rc = -ENOKEY;
+ u8 tx_key;
+
+ /* No encryption? */
+ if (!tx->working)
+ return 0;
+
+ /* Try with the pending key if available and:
+ * 1) This is the only choice (i.e. no active key) or;
+ * 2) Peer has switched to this key (unicast only) or;
+ * 3) It is time to do a pending key probe;
+ */
+ if (unlikely(key.pending)) {
+ tx_key = key.pending;
+ if (!key.active)
+ goto encrypt;
+ if (__rx && atomic_read(&__rx->peer_rx_active) == tx_key)
+ goto encrypt;
+ if (TIPC_SKB_CB(*skb)->probe)
+ goto encrypt;
+ if (!__rx &&
+ time_after(jiffies, tx->timer2 + TIPC_TX_PROBE_LIM)) {
+ tx->timer2 = jiffies;
+ probe = skb_clone(*skb, GFP_ATOMIC);
+ if (probe) {
+ TIPC_SKB_CB(probe)->probe = 1;
+ tipc_crypto_xmit(net, &probe, b, dst, __dnode);
+ if (probe)
+ b->media->send_msg(net, probe, b, dst);
+ }
+ }
+ }
+ /* Else, use the active key if any */
+ if (likely(key.active)) {
+ tx_key = key.active;
+ goto encrypt;
+ }
+ goto exit;
+
+encrypt:
+ aead = tipc_aead_get(tx->aead[tx_key]);
+ if (unlikely(!aead))
+ goto exit;
+ rc = tipc_ehdr_build(net, aead, tx_key, *skb, __rx);
+ if (likely(rc > 0))
+ rc = tipc_aead_encrypt(aead, *skb, b, dst, __dnode);
+
+exit:
+ switch (rc) {
+ case 0:
+ this_cpu_inc(stats->stat[STAT_OK]);
+ break;
+ case -EINPROGRESS:
+ case -EBUSY:
+ this_cpu_inc(stats->stat[STAT_ASYNC]);
+ *skb = NULL;
+ return rc;
+ default:
+ this_cpu_inc(stats->stat[STAT_NOK]);
+ if (rc == -ENOKEY)
+ this_cpu_inc(stats->stat[STAT_NOKEYS]);
+ else if (rc == -EKEYREVOKED)
+ this_cpu_inc(stats->stat[STAT_BADKEYS]);
+ kfree_skb(*skb);
+ *skb = NULL;
+ break;
+ }
+
+ tipc_aead_put(aead);
+ return rc;
+}
+
+/**
+ * tipc_crypto_rcv - Decrypt an encrypted TIPC message from peer
+ * @net: struct net
+ * @rx: RX crypto handle
+ * @skb: input/output message skb pointer
+ * @b: bearer where the message has been received
+ *
+ * If the decryption is successful, the decrypted skb is returned directly or
+ * as the callback, the encryption header and auth tag will be trimed out
+ * before forwarding to tipc_rcv() via the tipc_crypto_rcv_complete().
+ * Otherwise, the skb will be freed!
+ * Note: RX key(s) can be re-aligned, or in case of no key suitable, TX
+ * cluster key(s) can be taken for decryption (- recursive).
+ *
+ * Return:
+ * 0 : the decryption has successfully completed
+ * -EINPROGRESS/-EBUSY : the decryption is ongoing, a callback will be made
+ * -ENOKEY : the decryption has failed due to no key
+ * -EBADMSG : the decryption has failed due to bad message
+ * -ENOMEM : the decryption has failed due to no memory
+ * < 0 : the decryption has failed due to other reasons
+ */
+int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx,
+ struct sk_buff **skb, struct tipc_bearer *b)
+{
+ struct tipc_crypto *tx = tipc_net(net)->crypto_tx;
+ struct tipc_crypto_stats __percpu *stats;
+ struct tipc_aead *aead = NULL;
+ struct tipc_key key;
+ int rc = -ENOKEY;
+ u8 tx_key = 0;
+
+ /* New peer?
+ * Let's try with TX key (i.e. cluster mode) & verify the skb first!
+ */
+ if (unlikely(!rx))
+ goto pick_tx;
+
+ /* Pick RX key according to TX key, three cases are possible:
+ * 1) The current active key (likely) or;
+ * 2) The pending (new or deactivated) key (if any) or;
+ * 3) The passive or old active key (i.e. users > 0);
+ */
+ tx_key = ((struct tipc_ehdr *)(*skb)->data)->tx_key;
+ key = rx->key;
+ if (likely(tx_key == key.active))
+ goto decrypt;
+ if (tx_key == key.pending)
+ goto decrypt;
+ if (tx_key == key.passive) {
+ rx->timer2 = jiffies;
+ if (tipc_aead_users(rx->aead[key.passive]) > 0)
+ goto decrypt;
+ }
+
+ /* Unknown key, let's try to align RX key(s) */
+ if (tipc_crypto_key_try_align(rx, tx_key))
+ goto decrypt;
+
+pick_tx:
+ /* No key suitable? Try to pick one from TX... */
+ aead = tipc_crypto_key_pick_tx(tx, rx, *skb);
+ if (aead)
+ goto decrypt;
+ goto exit;
+
+decrypt:
+ rcu_read_lock();
+ if (!aead)
+ aead = tipc_aead_get(rx->aead[tx_key]);
+ rc = tipc_aead_decrypt(net, aead, *skb, b);
+ rcu_read_unlock();
+
+exit:
+ stats = ((rx) ?: tx)->stats;
+ switch (rc) {
+ case 0:
+ this_cpu_inc(stats->stat[STAT_OK]);
+ break;
+ case -EINPROGRESS:
+ case -EBUSY:
+ this_cpu_inc(stats->stat[STAT_ASYNC]);
+ *skb = NULL;
+ return rc;
+ default:
+ this_cpu_inc(stats->stat[STAT_NOK]);
+ if (rc == -ENOKEY) {
+ kfree_skb(*skb);
+ *skb = NULL;
+ if (rx)
+ tipc_node_put(rx->node);
+ this_cpu_inc(stats->stat[STAT_NOKEYS]);
+ return rc;
+ } else if (rc == -EBADMSG) {
+ this_cpu_inc(stats->stat[STAT_BADMSGS]);
+ }
+ break;
+ }
+
+ tipc_crypto_rcv_complete(net, aead, b, skb, rc);
+ return rc;
+}
+
+static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,
+ struct tipc_bearer *b,
+ struct sk_buff **skb, int err)
+{
+ struct tipc_skb_cb *skb_cb = TIPC_SKB_CB(*skb);
+ struct tipc_crypto *rx = aead->crypto;
+ struct tipc_aead *tmp = NULL;
+ struct tipc_ehdr *ehdr;
+ struct tipc_node *n;
+ u8 rx_key_active;
+ bool destined;
+
+ /* Is this completed by TX? */
+ if (unlikely(!rx->node)) {
+ rx = skb_cb->tx_clone_ctx.rx;
+#ifdef TIPC_CRYPTO_DEBUG
+ pr_info("TX->RX(%s): err %d, aead %p, skb->next %p, flags %x\n",
+ (rx) ? tipc_node_get_id_str(rx->node) : "-", err, aead,
+ (*skb)->next, skb_cb->flags);
+ pr_info("skb_cb [recurs %d, last %p], tx->aead [%p %p %p]\n",
+ skb_cb->tx_clone_ctx.recurs, skb_cb->tx_clone_ctx.last,
+ aead->crypto->aead[1], aead->crypto->aead[2],
+ aead->crypto->aead[3]);
+#endif
+ if (unlikely(err)) {
+ if (err == -EBADMSG && (*skb)->next)
+ tipc_rcv(net, (*skb)->next, b);
+ goto free_skb;
+ }
+
+ if (likely((*skb)->next)) {
+ kfree_skb((*skb)->next);
+ (*skb)->next = NULL;
+ }
+ ehdr = (struct tipc_ehdr *)(*skb)->data;
+ if (!rx) {
+ WARN_ON(ehdr->user != LINK_CONFIG);
+ n = tipc_node_create(net, 0, ehdr->id, 0xffffu, 0,
+ true);
+ rx = tipc_node_crypto_rx(n);
+ if (unlikely(!rx))
+ goto free_skb;
+ }
+
+ /* Skip cloning this time as we had a RX pending key */
+ if (rx->key.pending)
+ goto rcv;
+ if (tipc_aead_clone(&tmp, aead) < 0)
+ goto rcv;
+ if (tipc_crypto_key_attach(rx, tmp, ehdr->tx_key) < 0) {
+ tipc_aead_free(&tmp->rcu);
+ goto rcv;
+ }
+ tipc_aead_put(aead);
+ aead = tipc_aead_get(tmp);
+ }
+
+ if (unlikely(err)) {
+ tipc_aead_users_dec(aead, INT_MIN);
+ goto free_skb;
+ }
+
+ /* Set the RX key's user */
+ tipc_aead_users_set(aead, 1);
+
+rcv:
+ /* Mark this point, RX works */
+ rx->timer1 = jiffies;
+
+ /* Remove ehdr & auth. tag prior to tipc_rcv() */
+ ehdr = (struct tipc_ehdr *)(*skb)->data;
+ destined = ehdr->destined;
+ rx_key_active = ehdr->rx_key_active;
+ skb_pull(*skb, tipc_ehdr_size(ehdr));
+ pskb_trim(*skb, (*skb)->len - aead->authsize);
+
+ /* Validate TIPCv2 message */
+ if (unlikely(!tipc_msg_validate(skb))) {
+ pr_err_ratelimited("Packet dropped after decryption!\n");
+ goto free_skb;
+ }
+
+ /* Update peer RX active key & TX users */
+ if (destined)
+ tipc_crypto_key_synch(rx, rx_key_active, buf_msg(*skb));
+
+ /* Mark skb decrypted */
+ skb_cb->decrypted = 1;
+
+ /* Clear clone cxt if any */
+ if (likely(!skb_cb->tx_clone_deferred))
+ goto exit;
+ skb_cb->tx_clone_deferred = 0;
+ memset(&skb_cb->tx_clone_ctx, 0, sizeof(skb_cb->tx_clone_ctx));
+ goto exit;
+
+free_skb:
+ kfree_skb(*skb);
+ *skb = NULL;
+
+exit:
+ tipc_aead_put(aead);
+ if (rx)
+ tipc_node_put(rx->node);
+}
+
+static void tipc_crypto_do_cmd(struct net *net, int cmd)
+{
+ struct tipc_net *tn = tipc_net(net);
+ struct tipc_crypto *tx = tn->crypto_tx, *rx;
+ struct list_head *p;
+ unsigned int stat;
+ int i, j, cpu;
+ char buf[200];
+
+ /* Currently only one command is supported */
+ switch (cmd) {
+ case 0xfff1:
+ goto print_stats;
+ default:
+ return;
+ }
+
+print_stats:
+ /* Print a header */
+ pr_info("\n=============== TIPC Crypto Statistics ===============\n\n");
+
+ /* Print key status */
+ pr_info("Key status:\n");
+ pr_info("TX(%7.7s)\n%s", tipc_own_id_string(net),
+ tipc_crypto_key_dump(tx, buf));
+
+ rcu_read_lock();
+ for (p = tn->node_list.next; p != &tn->node_list; p = p->next) {
+ rx = tipc_node_crypto_rx_by_list(p);
+ pr_info("RX(%7.7s)\n%s", tipc_node_get_id_str(rx->node),
+ tipc_crypto_key_dump(rx, buf));
+ }
+ rcu_read_unlock();
+
+ /* Print crypto statistics */
+ for (i = 0, j = 0; i < MAX_STATS; i++)
+ j += scnprintf(buf + j, 200 - j, "|%11s ", hstats[i]);
+ pr_info("\nCounter %s", buf);
+
+ memset(buf, '-', 115);
+ buf[115] = '\0';
+ pr_info("%s\n", buf);
+
+ j = scnprintf(buf, 200, "TX(%7.7s) ", tipc_own_id_string(net));
+ for_each_possible_cpu(cpu) {
+ for (i = 0; i < MAX_STATS; i++) {
+ stat = per_cpu_ptr(tx->stats, cpu)->stat[i];
+ j += scnprintf(buf + j, 200 - j, "|%11d ", stat);
+ }
+ pr_info("%s", buf);
+ j = scnprintf(buf, 200, "%12s", " ");
+ }
+
+ rcu_read_lock();
+ for (p = tn->node_list.next; p != &tn->node_list; p = p->next) {
+ rx = tipc_node_crypto_rx_by_list(p);
+ j = scnprintf(buf, 200, "RX(%7.7s) ",
+ tipc_node_get_id_str(rx->node));
+ for_each_possible_cpu(cpu) {
+ for (i = 0; i < MAX_STATS; i++) {
+ stat = per_cpu_ptr(rx->stats, cpu)->stat[i];
+ j += scnprintf(buf + j, 200 - j, "|%11d ",
+ stat);
+ }
+ pr_info("%s", buf);
+ j = scnprintf(buf, 200, "%12s", " ");
+ }
+ }
+ rcu_read_unlock();
+
+ pr_info("\n======================== Done ========================\n");
+}
+
+static char *tipc_crypto_key_dump(struct tipc_crypto *c, char *buf)
+{
+ struct tipc_key key = c->key;
+ struct tipc_aead *aead;
+ int k, i = 0;
+ char *s;
+
+ for (k = KEY_MIN; k <= KEY_MAX; k++) {
+ if (k == key.passive)
+ s = "PAS";
+ else if (k == key.active)
+ s = "ACT";
+ else if (k == key.pending)
+ s = "PEN";
+ else
+ s = "-";
+ i += scnprintf(buf + i, 200 - i, "\tKey%d: %s", k, s);
+
+ rcu_read_lock();
+ aead = rcu_dereference(c->aead[k]);
+ if (aead)
+ i += scnprintf(buf + i, 200 - i,
+ "{\"%s...\", \"%s\"}/%d:%d",
+ aead->hint,
+ (aead->mode == CLUSTER_KEY) ? "c" : "p",
+ atomic_read(&aead->users),
+ refcount_read(&aead->refcnt));
+ rcu_read_unlock();
+ i += scnprintf(buf + i, 200 - i, "\n");
+ }
+
+ if (c->node)
+ i += scnprintf(buf + i, 200 - i, "\tPeer RX active: %d\n",
+ atomic_read(&c->peer_rx_active));
+
+ return buf;
+}
+
+#ifdef TIPC_CRYPTO_DEBUG
+static char *tipc_key_change_dump(struct tipc_key old, struct tipc_key new,
+ char *buf)
+{
+ struct tipc_key *key = &old;
+ int k, i = 0;
+ char *s;
+
+ /* Output format: "[%s %s %s] -> [%s %s %s]", max len = 32 */
+again:
+ i += scnprintf(buf + i, 32 - i, "[");
+ for (k = KEY_MIN; k <= KEY_MAX; k++) {
+ if (k == key->passive)
+ s = "pas";
+ else if (k == key->active)
+ s = "act";
+ else if (k == key->pending)
+ s = "pen";
+ else
+ s = "-";
+ i += scnprintf(buf + i, 32 - i,
+ (k != KEY_MAX) ? "%s " : "%s", s);
+ }
+ if (key != &new) {
+ i += scnprintf(buf + i, 32 - i, "] -> ");
+ key = &new;
+ goto again;
+ }
+ i += scnprintf(buf + i, 32 - i, "]");
+ return buf;
+}
+#endif
diff --git a/net/tipc/crypto.h b/net/tipc/crypto.h
new file mode 100644
index 000000000000..c3de769f49e8
--- /dev/null
+++ b/net/tipc/crypto.h
@@ -0,0 +1,167 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/**
+ * net/tipc/crypto.h: Include file for TIPC crypto
+ *
+ * Copyright (c) 2019, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifdef CONFIG_TIPC_CRYPTO
+#ifndef _TIPC_CRYPTO_H
+#define _TIPC_CRYPTO_H
+
+#include "core.h"
+#include "node.h"
+#include "msg.h"
+#include "bearer.h"
+
+#define TIPC_EVERSION 7
+
+/* AEAD aes(gcm) */
+#define TIPC_AES_GCM_KEY_SIZE_128 16
+#define TIPC_AES_GCM_KEY_SIZE_192 24
+#define TIPC_AES_GCM_KEY_SIZE_256 32
+
+#define TIPC_AES_GCM_SALT_SIZE 4
+#define TIPC_AES_GCM_IV_SIZE 12
+#define TIPC_AES_GCM_TAG_SIZE 16
+
+/**
+ * TIPC crypto modes:
+ * - CLUSTER_KEY:
+ * One single key is used for both TX & RX in all nodes in the cluster.
+ * - PER_NODE_KEY:
+ * Each nodes in the cluster has one TX key, for RX a node needs to know
+ * its peers' TX key for the decryption of messages from those nodes.
+ */
+enum {
+ CLUSTER_KEY = 1,
+ PER_NODE_KEY = (1 << 1),
+};
+
+extern int sysctl_tipc_max_tfms __read_mostly;
+
+/**
+ * TIPC encryption message format:
+ *
+ * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
+ * 1 0 9 8 7 6 5 4|3 2 1 0 9 8 7 6|5 4 3 2 1 0 9 8|7 6 5 4 3 2 1 0
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * w0:|Ver=7| User |D|TX |RX |K| Rsvd |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * w1:| Seqno |
+ * w2:| (8 octets) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * w3:\ Prevnode \
+ * / (4 or 16 octets) /
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * \ \
+ * / Encrypted complete TIPC V2 header and user data /
+ * \ \
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | AuthTag |
+ * | (16 octets) |
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Word0:
+ * Ver : = 7 i.e. TIPC encryption message version
+ * User : = 7 (for LINK_PROTOCOL); = 13 (for LINK_CONFIG) or = 0
+ * D : The destined bit i.e. the message's destination node is
+ * "known" or not at the message encryption
+ * TX : TX key used for the message encryption
+ * RX : Currently RX active key corresponding to the destination
+ * node's TX key (when the "D" bit is set)
+ * K : Keep-alive bit (for RPS, LINK_PROTOCOL/STATE_MSG only)
+ * Rsvd : Reserved bit, field
+ * Word1-2:
+ * Seqno : The 64-bit sequence number of the encrypted message, also
+ * part of the nonce used for the message encryption/decryption
+ * Word3-:
+ * Prevnode: The source node address, or ID in case LINK_CONFIG only
+ * AuthTag : The authentication tag for the message integrity checking
+ * generated by the message encryption
+ */
+struct tipc_ehdr {
+ union {
+ struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 destined:1,
+ user:4,
+ version:3;
+ __u8 reserved_1:3,
+ keepalive:1,
+ rx_key_active:2,
+ tx_key:2;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ __u8 version:3,
+ user:4,
+ destined:1;
+ __u8 tx_key:2,
+ rx_key_active:2,
+ keepalive:1,
+ reserved_1:3;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __be16 reserved_2;
+ } __packed;
+ __be32 w0;
+ };
+ __be64 seqno;
+ union {
+ __be32 addr;
+ __u8 id[NODE_ID_LEN]; /* For a LINK_CONFIG message only! */
+ };
+#define EHDR_SIZE (offsetof(struct tipc_ehdr, addr) + sizeof(__be32))
+#define EHDR_CFG_SIZE (sizeof(struct tipc_ehdr))
+#define EHDR_MIN_SIZE (EHDR_SIZE)
+#define EHDR_MAX_SIZE (EHDR_CFG_SIZE)
+#define EMSG_OVERHEAD (EHDR_SIZE + TIPC_AES_GCM_TAG_SIZE)
+} __packed;
+
+int tipc_crypto_start(struct tipc_crypto **crypto, struct net *net,
+ struct tipc_node *node);
+void tipc_crypto_stop(struct tipc_crypto **crypto);
+void tipc_crypto_timeout(struct tipc_crypto *rx);
+int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,
+ struct tipc_bearer *b, struct tipc_media_addr *dst,
+ struct tipc_node *__dnode);
+int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx,
+ struct sk_buff **skb, struct tipc_bearer *b);
+int tipc_crypto_key_init(struct tipc_crypto *c, struct tipc_aead_key *ukey,
+ u8 mode);
+void tipc_crypto_key_flush(struct tipc_crypto *c);
+int tipc_aead_key_validate(struct tipc_aead_key *ukey);
+bool tipc_ehdr_validate(struct sk_buff *skb);
+
+#endif /* _TIPC_CRYPTO_H */
+#endif
diff --git a/net/tipc/link.c b/net/tipc/link.c
index e7bb4cbb7716..fb72031228c9 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -44,6 +44,7 @@
#include "netlink.h"
#include "monitor.h"
#include "trace.h"
+#include "crypto.h"
#include <linux/pkt_sched.h>
@@ -397,6 +398,15 @@ int tipc_link_mtu(struct tipc_link *l)
return l->mtu;
}
+int tipc_link_mss(struct tipc_link *l)
+{
+#ifdef CONFIG_TIPC_CRYPTO
+ return l->mtu - INT_H_SIZE - EMSG_OVERHEAD;
+#else
+ return l->mtu - INT_H_SIZE;
+#endif
+}
+
u16 tipc_link_rcv_nxt(struct tipc_link *l)
{
return l->rcv_nxt;
@@ -948,6 +958,7 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
u16 seqno = l->snd_nxt;
int pkt_cnt = skb_queue_len(list);
int imp = msg_importance(hdr);
+ unsigned int mss = tipc_link_mss(l);
unsigned int maxwin = l->window;
unsigned int mtu = l->mtu;
bool new_bundle;
@@ -1000,8 +1011,7 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
continue;
}
if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb,
- mtu - INT_H_SIZE, l->addr,
- &new_bundle)) {
+ mss, l->addr, &new_bundle)) {
if (skb) {
/* Keep a ref. to the skb for next try */
l->backlog[imp].target_bskb = skb;
@@ -1154,7 +1164,7 @@ static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
continue;
TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
- _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC);
+ _skb = pskb_copy(skb, GFP_ATOMIC);
if (!_skb)
return 0;
hdr = buf_msg(_skb);
@@ -1430,8 +1440,7 @@ static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap,
if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
continue;
TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME;
- _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE,
- GFP_ATOMIC);
+ _skb = pskb_copy(skb, GFP_ATOMIC);
if (!_skb)
continue;
hdr = buf_msg(_skb);
diff --git a/net/tipc/link.h b/net/tipc/link.h
index adcad65e761c..c09e9d49d0a3 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -141,6 +141,7 @@ void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
int tipc_link_bc_peers(struct tipc_link *l);
void tipc_link_set_mtu(struct tipc_link *l, int mtu);
int tipc_link_mtu(struct tipc_link *l);
+int tipc_link_mss(struct tipc_link *l);
void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
struct sk_buff_head *xmitq);
void tipc_link_build_bc_sync_msg(struct tipc_link *l,
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index acb7be592fb1..0d515d20b056 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -39,10 +39,16 @@
#include "msg.h"
#include "addr.h"
#include "name_table.h"
+#include "crypto.h"
#define MAX_FORWARD_SIZE 1024
+#ifdef CONFIG_TIPC_CRYPTO
+#define BUF_HEADROOM ALIGN(((LL_MAX_HEADER + 48) + EHDR_MAX_SIZE), 16)
+#define BUF_TAILROOM (TIPC_AES_GCM_TAG_SIZE)
+#else
#define BUF_HEADROOM (LL_MAX_HEADER + 48)
#define BUF_TAILROOM 16
+#endif
static unsigned int align(unsigned int i)
{
@@ -61,7 +67,11 @@ static unsigned int align(unsigned int i)
struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp)
{
struct sk_buff *skb;
+#ifdef CONFIG_TIPC_CRYPTO
+ unsigned int buf_size = (BUF_HEADROOM + size + BUF_TAILROOM + 3) & ~3u;
+#else
unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
+#endif
skb = alloc_skb_fclone(buf_size, gfp);
if (skb) {
@@ -173,7 +183,7 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf)
}
if (fragid == LAST_FRAGMENT) {
- TIPC_SKB_CB(head)->validated = false;
+ TIPC_SKB_CB(head)->validated = 0;
if (unlikely(!tipc_msg_validate(&head)))
goto err;
*buf = head;
@@ -271,6 +281,7 @@ bool tipc_msg_validate(struct sk_buff **_skb)
if (unlikely(TIPC_SKB_CB(skb)->validated))
return true;
+
if (unlikely(!pskb_may_pull(skb, MIN_H_SIZE)))
return false;
@@ -292,7 +303,7 @@ bool tipc_msg_validate(struct sk_buff **_skb)
if (unlikely(skb->len < msz))
return false;
- TIPC_SKB_CB(skb)->validated = true;
+ TIPC_SKB_CB(skb)->validated = 1;
return true;
}
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 14697e6c995e..6d466ebdb64f 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -102,16 +102,42 @@ struct plist;
#define TIPC_MEDIA_INFO_OFFSET 5
struct tipc_skb_cb {
- struct sk_buff *tail;
- unsigned long nxt_retr;
- unsigned long retr_stamp;
- u32 bytes_read;
- u32 orig_member;
- u16 chain_imp;
- u16 ackers;
- u16 retr_cnt;
- bool validated;
-};
+ union {
+ struct {
+ struct sk_buff *tail;
+ unsigned long nxt_retr;
+ unsigned long retr_stamp;
+ u32 bytes_read;
+ u32 orig_member;
+ u16 chain_imp;
+ u16 ackers;
+ u16 retr_cnt;
+ } __packed;
+#ifdef CONFIG_TIPC_CRYPTO
+ struct {
+ struct tipc_crypto *rx;
+ struct tipc_aead *last;
+ u8 recurs;
+ } tx_clone_ctx __packed;
+#endif
+ } __packed;
+ union {
+ struct {
+ u8 validated:1;
+#ifdef CONFIG_TIPC_CRYPTO
+ u8 encrypted:1;
+ u8 decrypted:1;
+ u8 probe:1;
+ u8 tx_clone_deferred:1;
+#endif
+ };
+ u8 flags;
+ };
+ u8 reserved;
+#ifdef CONFIG_TIPC_CRYPTO
+ void *crypto_ctx;
+#endif
+} __packed;
#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 43d12a630f34..d8bf2c179562 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -44,6 +44,7 @@
#include "discover.h"
#include "netlink.h"
#include "trace.h"
+#include "crypto.h"
#define INVALID_NODE_SIG 0x10000
#define NODE_CLEANUP_AFTER 300000
@@ -100,6 +101,7 @@ struct tipc_bclink_entry {
* @publ_list: list of publications
* @rcu: rcu struct for tipc_node
* @delete_at: indicates the time for deleting a down node
+ * @crypto_rx: RX crypto handler
*/
struct tipc_node {
u32 addr;
@@ -131,6 +133,9 @@ struct tipc_node {
unsigned long delete_at;
struct net *peer_net;
u32 peer_hash_mix;
+#ifdef CONFIG_TIPC_CRYPTO
+ struct tipc_crypto *crypto_rx;
+#endif
};
/* Node FSM states and events:
@@ -168,7 +173,6 @@ static void tipc_node_timeout(struct timer_list *t);
static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
static struct tipc_node *tipc_node_find_by_id(struct net *net, u8 *id);
-static void tipc_node_put(struct tipc_node *node);
static bool node_is_up(struct tipc_node *n);
static void tipc_node_delete_from_list(struct tipc_node *node);
@@ -258,15 +262,41 @@ char *tipc_node_get_id_str(struct tipc_node *node)
return node->peer_id_string;
}
+#ifdef CONFIG_TIPC_CRYPTO
+/**
+ * tipc_node_crypto_rx - Retrieve crypto RX handle from node
+ * Note: node ref counter must be held first!
+ */
+struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n)
+{
+ return (__n) ? __n->crypto_rx : NULL;
+}
+
+struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos)
+{
+ return container_of(pos, struct tipc_node, list)->crypto_rx;
+}
+#endif
+
+void tipc_node_free(struct rcu_head *rp)
+{
+ struct tipc_node *n = container_of(rp, struct tipc_node, rcu);
+
+#ifdef CONFIG_TIPC_CRYPTO
+ tipc_crypto_stop(&n->crypto_rx);
+#endif
+ kfree(n);
+}
+
static void tipc_node_kref_release(struct kref *kref)
{
struct tipc_node *n = container_of(kref, struct tipc_node, kref);
kfree(n->bc_entry.link);
- kfree_rcu(n, rcu);
+ call_rcu(&n->rcu, tipc_node_free);
}
-static void tipc_node_put(struct tipc_node *node)
+void tipc_node_put(struct tipc_node *node)
{
kref_put(&node->kref, tipc_node_kref_release);
}
@@ -411,9 +441,9 @@ static void tipc_node_assign_peer_net(struct tipc_node *n, u32 hash_mixes)
}
}
-static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
- u8 *peer_id, u16 capabilities,
- u32 hash_mixes, bool preliminary)
+struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
+ u16 capabilities, u32 hash_mixes,
+ bool preliminary)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_node *n, *temp_node;
@@ -474,6 +504,14 @@ static struct tipc_node *tipc_node_create(struct net *net, u32 addr,
goto exit;
}
tipc_nodeid2string(n->peer_id_string, peer_id);
+#ifdef CONFIG_TIPC_CRYPTO
+ if (unlikely(tipc_crypto_start(&n->crypto_rx, net, n))) {
+ pr_warn("Failed to start crypto RX(%s)!\n", n->peer_id_string);
+ kfree(n);
+ n = NULL;
+ goto exit;
+ }
+#endif
n->addr = addr;
n->preliminary = preliminary;
memcpy(&n->peer_id, peer_id, 16);
@@ -725,6 +763,10 @@ static void tipc_node_timeout(struct timer_list *t)
return;
}
+#ifdef CONFIG_TIPC_CRYPTO
+ /* Take any crypto key related actions first */
+ tipc_crypto_timeout(n->crypto_rx);
+#endif
__skb_queue_head_init(&xmitq);
/* Initial node interval to value larger (10 seconds), then it will be
@@ -745,7 +787,7 @@ static void tipc_node_timeout(struct timer_list *t)
remains--;
}
tipc_node_read_unlock(n);
- tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
+ tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr, n);
if (rc & TIPC_LINK_DOWN_EVT)
tipc_node_link_down(n, bearer_id, false);
}
@@ -777,7 +819,7 @@ static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
n->link_id = tipc_link_id(nl);
/* Leave room for tunnel header when returning 'mtu' to users: */
- n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
+ n->links[bearer_id].mtu = tipc_link_mss(nl);
tipc_bearer_add_dest(n->net, bearer_id, n->addr);
tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
@@ -831,7 +873,7 @@ static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
tipc_node_write_lock(n);
__tipc_node_link_up(n, bearer_id, xmitq);
maddr = &n->links[bearer_id].maddr;
- tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
+ tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr, n);
tipc_node_write_unlock(n);
}
@@ -986,7 +1028,7 @@ static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
if (delete)
tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
if (!skb_queue_empty(&xmitq))
- tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
+ tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr, n);
tipc_sk_rcv(n->net, &le->inputq);
}
@@ -1640,7 +1682,7 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
if (unlikely(rc == -ENOBUFS))
tipc_node_link_down(n, bearer_id, false);
else
- tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
tipc_node_put(n);
@@ -1788,7 +1830,7 @@ static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id
}
if (!skb_queue_empty(&xmitq))
- tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
if (!skb_queue_empty(&be->inputq1))
tipc_node_mcast_rcv(n);
@@ -1966,20 +2008,38 @@ static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
{
struct sk_buff_head xmitq;
- struct tipc_node *n;
+ struct tipc_link_entry *le;
struct tipc_msg *hdr;
+ struct tipc_node *n;
int bearer_id = b->identity;
- struct tipc_link_entry *le;
u32 self = tipc_own_addr(net);
int usr, rc = 0;
u16 bc_ack;
+#ifdef CONFIG_TIPC_CRYPTO
+ struct tipc_ehdr *ehdr;
- __skb_queue_head_init(&xmitq);
+ /* Check if message must be decrypted first */
+ if (TIPC_SKB_CB(skb)->decrypted || !tipc_ehdr_validate(skb))
+ goto rcv;
+ ehdr = (struct tipc_ehdr *)skb->data;
+ if (likely(ehdr->user != LINK_CONFIG)) {
+ n = tipc_node_find(net, ntohl(ehdr->addr));
+ if (unlikely(!n))
+ goto discard;
+ } else {
+ n = tipc_node_find_by_id(net, ehdr->id);
+ }
+ tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b);
+ if (!skb)
+ return;
+
+rcv:
+#endif
/* Ensure message is well-formed before touching the header */
- TIPC_SKB_CB(skb)->validated = false;
if (unlikely(!tipc_msg_validate(&skb)))
goto discard;
+ __skb_queue_head_init(&xmitq);
hdr = buf_msg(skb);
usr = msg_user(hdr);
bc_ack = msg_bcast_ack(hdr);
@@ -2050,7 +2110,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
tipc_sk_rcv(net, &le->inputq);
if (!skb_queue_empty(&xmitq))
- tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr, n);
tipc_node_put(n);
discard:
@@ -2081,7 +2141,7 @@ void tipc_node_apply_property(struct net *net, struct tipc_bearer *b,
tipc_link_set_mtu(e->link, b->mtu);
}
tipc_node_write_unlock(n);
- tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr);
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL);
}
rcu_read_unlock();
@@ -2323,7 +2383,8 @@ int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
out:
tipc_node_read_unlock(node);
- tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
+ tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr,
+ NULL);
return res;
}
diff --git a/net/tipc/node.h b/net/tipc/node.h
index 50f8838b32c2..1a15cf82cb11 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -76,6 +76,14 @@ void tipc_node_stop(struct net *net);
bool tipc_node_get_id(struct net *net, u32 addr, u8 *id);
u32 tipc_node_get_addr(struct tipc_node *node);
char *tipc_node_get_id_str(struct tipc_node *node);
+void tipc_node_put(struct tipc_node *node);
+struct tipc_node *tipc_node_create(struct net *net, u32 addr, u8 *peer_id,
+ u16 capabilities, u32 hash_mixes,
+ bool preliminary);
+#ifdef CONFIG_TIPC_CRYPTO
+struct tipc_crypto *tipc_node_crypto_rx(struct tipc_node *__n);
+struct tipc_crypto *tipc_node_crypto_rx_by_list(struct list_head *pos);
+#endif
u32 tipc_node_try_addr(struct net *net, u8 *id, u32 addr);
void tipc_node_check_dest(struct net *net, u32 onode, u8 *peer_id128,
struct tipc_bearer *bearer,
diff --git a/net/tipc/sysctl.c b/net/tipc/sysctl.c
index 6159d327db76..58ab3d6dcdce 100644
--- a/net/tipc/sysctl.c
+++ b/net/tipc/sysctl.c
@@ -35,6 +35,7 @@
#include "core.h"
#include "trace.h"
+#include "crypto.h"
#include <linux/sysctl.h>
@@ -64,6 +65,16 @@ static struct ctl_table tipc_table[] = {
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
},
+#ifdef CONFIG_TIPC_CRYPTO
+ {
+ .procname = "max_tfms",
+ .data = &sysctl_tipc_max_tfms,
+ .maxlen = sizeof(sysctl_tipc_max_tfms),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ },
+#endif
{}
};
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 43ca5fd6574d..86aaa4d3e781 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -372,6 +372,7 @@ static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
goto out;
if (b && test_bit(0, &b->up)) {
+ TIPC_SKB_CB(skb)->flags = 0;
tipc_rcv(sock_net(sk), skb, b);
return 0;
}
--
2.13.7
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