void (*unhash)(struct tls_device *device, struct sock *sk);
};
+enum {
+ TLS_BASE,
+ TLS_SW,
+#ifdef CONFIG_TLS_DEVICE
+ TLS_HW,
+#endif
+ TLS_HW_RECORD,
+ TLS_NUM_CONFIG,
+};
+
struct tls_sw_context_tx {
struct crypto_aead *aead_send;
struct crypto_wait async_wait;
int (*push_pending_record)(struct sock *sk, int flags);
void (*sk_write_space)(struct sock *sk);
+ void (*sk_destruct)(struct sock *sk);
void (*sk_proto_close)(struct sock *sk, long timeout);
int (*setsockopt)(struct sock *sk, int level,
void (*unhash)(struct sock *sk);
};
+struct tls_offload_context_rx {
+ /* sw must be the first member of tls_offload_context_rx */
+ struct tls_sw_context_rx sw;
+ atomic64_t resync_req;
+ u8 driver_state[];
+ /* The TLS layer reserves room for driver specific state
+ * Currently the belief is that there is not enough
+ * driver specific state to justify another layer of indirection
+ */
+};
+
+#define TLS_OFFLOAD_CONTEXT_SIZE_RX \
+ (ALIGN(sizeof(struct tls_offload_context_rx), sizeof(void *)) + \
+ TLS_DRIVER_STATE_SIZE)
+
int wait_on_pending_writer(struct sock *sk, long *timeo);
int tls_sk_query(struct sock *sk, int optname, char __user *optval,
int __user *optlen);
int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
unsigned int optlen);
-
int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
int tls_sw_sendpage(struct sock *sk, struct page *page,
return tls_ctx->pending_open_record_frags;
}
+struct sk_buff *
+tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
+ struct sk_buff *skb);
+
static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
{
- return sk_fullsock(sk) &&
- /* matches smp_store_release in tls_set_device_offload */
- smp_load_acquire(&sk->sk_destruct) == &tls_device_sk_destruct;
+#ifdef CONFIG_SOCK_VALIDATE_XMIT
+ return sk_fullsock(sk) &
+ (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
+ &tls_validate_xmit_skb);
+#else
+ return false;
+#endif
}
static inline void tls_err_abort(struct sock *sk, int err)
return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
}
+static inline struct tls_offload_context_rx *
+tls_offload_ctx_rx(const struct tls_context *tls_ctx)
+{
+ return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
+}
+
+/* The TLS context is valid until sk_destruct is called */
+static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
+
+ atomic64_set(&rx_ctx->resync_req, ((((uint64_t)seq) << 32) | 1));
+}
+
+
int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
unsigned char *record_type);
void tls_register_device(struct tls_device *device);
void tls_unregister_device(struct tls_device *device);
+int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
int decrypt_skb(struct sock *sk, struct sk_buff *skb,
struct scatterlist *sgout);
struct tls_offload_context_tx *offload_ctx,
struct tls_crypto_info *crypto_info);
+int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
+
+void tls_device_offload_cleanup_rx(struct sock *sk);
+void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn);
+
#endif /* _TLS_OFFLOAD_H */
static void tls_device_free_ctx(struct tls_context *ctx)
{
- kfree(tls_offload_ctx_tx(ctx));
+ if (ctx->tx_conf == TLS_HW)
+ kfree(tls_offload_ctx_tx(ctx));
+
+ if (ctx->rx_conf == TLS_HW)
+ kfree(tls_offload_ctx_rx(ctx));
kfree(ctx);
}
list_for_each_entry_safe(ctx, tmp, &gc_list, list) {
struct net_device *netdev = ctx->netdev;
- if (netdev) {
+ if (netdev && ctx->tx_conf == TLS_HW) {
netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
TLS_OFFLOAD_CTX_DIR_TX);
dev_put(netdev);
+ ctx->netdev = NULL;
}
list_del(&ctx->list);
}
}
+static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
+ struct net_device *netdev)
+{
+ if (sk->sk_destruct != tls_device_sk_destruct) {
+ refcount_set(&ctx->refcount, 1);
+ dev_hold(netdev);
+ ctx->netdev = netdev;
+ spin_lock_irq(&tls_device_lock);
+ list_add_tail(&ctx->list, &tls_device_list);
+ spin_unlock_irq(&tls_device_lock);
+
+ ctx->sk_destruct = sk->sk_destruct;
+ sk->sk_destruct = tls_device_sk_destruct;
+ }
+}
+
static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
{
unsigned long flags;
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
- if (ctx->open_record)
- destroy_record(ctx->open_record);
+ tls_ctx->sk_destruct(sk);
- delete_all_records(ctx);
- crypto_free_aead(ctx->aead_send);
- ctx->sk_destruct(sk);
- clean_acked_data_disable(inet_csk(sk));
+ if (tls_ctx->tx_conf == TLS_HW) {
+ if (ctx->open_record)
+ destroy_record(ctx->open_record);
+ delete_all_records(ctx);
+ crypto_free_aead(ctx->aead_send);
+ clean_acked_data_disable(inet_csk(sk));
+ }
if (refcount_dec_and_test(&tls_ctx->refcount))
tls_device_queue_ctx_destruction(tls_ctx);
return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
}
+void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct net_device *netdev = tls_ctx->netdev;
+ struct tls_offload_context_rx *rx_ctx;
+ u32 is_req_pending;
+ s64 resync_req;
+ u32 req_seq;
+
+ if (tls_ctx->rx_conf != TLS_HW)
+ return;
+
+ rx_ctx = tls_offload_ctx_rx(tls_ctx);
+ resync_req = atomic64_read(&rx_ctx->resync_req);
+ req_seq = ntohl(resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1);
+ is_req_pending = resync_req;
+
+ if (unlikely(is_req_pending) && req_seq == seq &&
+ atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
+ netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk,
+ seq + TLS_HEADER_SIZE - 1,
+ rcd_sn);
+}
+
+static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)
+{
+ struct strp_msg *rxm = strp_msg(skb);
+ int err = 0, offset = rxm->offset, copy, nsg;
+ struct sk_buff *skb_iter, *unused;
+ struct scatterlist sg[1];
+ char *orig_buf, *buf;
+
+ orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
+ TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
+ if (!orig_buf)
+ return -ENOMEM;
+ buf = orig_buf;
+
+ nsg = skb_cow_data(skb, 0, &unused);
+ if (unlikely(nsg < 0)) {
+ err = nsg;
+ goto free_buf;
+ }
+
+ sg_init_table(sg, 1);
+ sg_set_buf(&sg[0], buf,
+ rxm->full_len + TLS_HEADER_SIZE +
+ TLS_CIPHER_AES_GCM_128_IV_SIZE);
+ skb_copy_bits(skb, offset, buf,
+ TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
+
+ /* We are interested only in the decrypted data not the auth */
+ err = decrypt_skb(sk, skb, sg);
+ if (err != -EBADMSG)
+ goto free_buf;
+ else
+ err = 0;
+
+ copy = min_t(int, skb_pagelen(skb) - offset,
+ rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE);
+
+ if (skb->decrypted)
+ skb_store_bits(skb, offset, buf, copy);
+
+ offset += copy;
+ buf += copy;
+
+ skb_walk_frags(skb, skb_iter) {
+ copy = min_t(int, skb_iter->len,
+ rxm->full_len - offset + rxm->offset -
+ TLS_CIPHER_AES_GCM_128_TAG_SIZE);
+
+ if (skb_iter->decrypted)
+ skb_store_bits(skb, offset, buf, copy);
+
+ offset += copy;
+ buf += copy;
+ }
+
+free_buf:
+ kfree(orig_buf);
+ return err;
+}
+
+int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
+ int is_decrypted = skb->decrypted;
+ int is_encrypted = !is_decrypted;
+ struct sk_buff *skb_iter;
+
+ /* Skip if it is already decrypted */
+ if (ctx->sw.decrypted)
+ return 0;
+
+ /* Check if all the data is decrypted already */
+ skb_walk_frags(skb, skb_iter) {
+ is_decrypted &= skb_iter->decrypted;
+ is_encrypted &= !skb_iter->decrypted;
+ }
+
+ ctx->sw.decrypted |= is_decrypted;
+
+ /* Return immedeatly if the record is either entirely plaintext or
+ * entirely ciphertext. Otherwise handle reencrypt partially decrypted
+ * record.
+ */
+ return (is_encrypted || is_decrypted) ? 0 :
+ tls_device_reencrypt(sk, skb);
+}
+
int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
{
u16 nonce_size, tag_size, iv_size, rec_seq_size;
clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked);
ctx->push_pending_record = tls_device_push_pending_record;
- offload_ctx->sk_destruct = sk->sk_destruct;
/* TLS offload is greatly simplified if we don't send
* SKBs where only part of the payload needs to be encrypted.
if (skb)
TCP_SKB_CB(skb)->eor = 1;
- refcount_set(&ctx->refcount, 1);
-
/* We support starting offload on multiple sockets
* concurrently, so we only need a read lock here.
* This lock must precede get_netdev_for_sock to prevent races between
if (rc)
goto release_netdev;
- ctx->netdev = netdev;
+ tls_device_attach(ctx, sk, netdev);
- spin_lock_irq(&tls_device_lock);
- list_add_tail(&ctx->list, &tls_device_list);
- spin_unlock_irq(&tls_device_lock);
-
- sk->sk_validate_xmit_skb = tls_validate_xmit_skb;
/* following this assignment tls_is_sk_tx_device_offloaded
* will return true and the context might be accessed
* by the netdev's xmit function.
*/
- smp_store_release(&sk->sk_destruct,
- &tls_device_sk_destruct);
+ smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
+ dev_put(netdev);
up_read(&device_offload_lock);
goto out;
return rc;
}
+int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
+{
+ struct tls_offload_context_rx *context;
+ struct net_device *netdev;
+ int rc = 0;
+
+ /* We support starting offload on multiple sockets
+ * concurrently, so we only need a read lock here.
+ * This lock must precede get_netdev_for_sock to prevent races between
+ * NETDEV_DOWN and setsockopt.
+ */
+ down_read(&device_offload_lock);
+ netdev = get_netdev_for_sock(sk);
+ if (!netdev) {
+ pr_err_ratelimited("%s: netdev not found\n", __func__);
+ rc = -EINVAL;
+ goto release_lock;
+ }
+
+ if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
+ pr_err_ratelimited("%s: netdev %s with no TLS offload\n",
+ __func__, netdev->name);
+ rc = -ENOTSUPP;
+ goto release_netdev;
+ }
+
+ /* Avoid offloading if the device is down
+ * We don't want to offload new flows after
+ * the NETDEV_DOWN event
+ */
+ if (!(netdev->flags & IFF_UP)) {
+ rc = -EINVAL;
+ goto release_netdev;
+ }
+
+ context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
+ if (!context) {
+ rc = -ENOMEM;
+ goto release_netdev;
+ }
+
+ ctx->priv_ctx_rx = context;
+ rc = tls_set_sw_offload(sk, ctx, 0);
+ if (rc)
+ goto release_ctx;
+
+ rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
+ &ctx->crypto_recv,
+ tcp_sk(sk)->copied_seq);
+ if (rc) {
+ pr_err_ratelimited("%s: The netdev has refused to offload this socket\n",
+ __func__);
+ goto free_sw_resources;
+ }
+
+ tls_device_attach(ctx, sk, netdev);
+ goto release_netdev;
+
+free_sw_resources:
+ tls_sw_free_resources_rx(sk);
+release_ctx:
+ ctx->priv_ctx_rx = NULL;
+release_netdev:
+ dev_put(netdev);
+release_lock:
+ up_read(&device_offload_lock);
+ return rc;
+}
+
+void tls_device_offload_cleanup_rx(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct net_device *netdev;
+
+ down_read(&device_offload_lock);
+ netdev = tls_ctx->netdev;
+ if (!netdev)
+ goto out;
+
+ if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
+ pr_err_ratelimited("%s: device is missing NETIF_F_HW_TLS_RX cap\n",
+ __func__);
+ goto out;
+ }
+
+ netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx,
+ TLS_OFFLOAD_CTX_DIR_RX);
+
+ if (tls_ctx->tx_conf != TLS_HW) {
+ dev_put(netdev);
+ tls_ctx->netdev = NULL;
+ }
+out:
+ up_read(&device_offload_lock);
+ kfree(tls_ctx->rx.rec_seq);
+ kfree(tls_ctx->rx.iv);
+ tls_sw_release_resources_rx(sk);
+}
+
static int tls_device_down(struct net_device *netdev)
{
struct tls_context *ctx, *tmp;
spin_unlock_irqrestore(&tls_device_lock, flags);
list_for_each_entry_safe(ctx, tmp, &list, list) {
- netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
- TLS_OFFLOAD_CTX_DIR_TX);
+ if (ctx->tx_conf == TLS_HW)
+ netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+ TLS_OFFLOAD_CTX_DIR_TX);
+ if (ctx->rx_conf == TLS_HW)
+ netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
+ TLS_OFFLOAD_CTX_DIR_RX);
ctx->netdev = NULL;
dev_put(netdev);
list_del_init(&ctx->list);
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- if (!(dev->features & NETIF_F_HW_TLS_TX))
+ if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
return NOTIFY_DONE;
switch (event) {
case NETDEV_REGISTER:
case NETDEV_FEAT_CHANGE:
+ if ((dev->features & NETIF_F_HW_TLS_RX) &&
+ !dev->tlsdev_ops->tls_dev_resync_rx)
+ return NOTIFY_BAD;
+
if (dev->tlsdev_ops &&
dev->tlsdev_ops->tls_dev_add &&
dev->tlsdev_ops->tls_dev_del)
projects / linux-2.6-microblaze.git / commitdiff