From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/net/tls/tls_device.c | 726 +++++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 542 insertions(+), 184 deletions(-)
diff --git a/kernel/net/tls/tls_device.c b/kernel/net/tls/tls_device.c
index 228e3ce..5cb6846 100644
--- a/kernel/net/tls/tls_device.c
+++ b/kernel/net/tls/tls_device.c
@@ -38,6 +38,8 @@
#include <net/tcp.h>
#include <net/tls.h>
+#include "trace.h"
+
/* device_offload_lock is used to synchronize tls_dev_add
* against NETDEV_DOWN notifications.
*/
@@ -48,6 +50,7 @@
static DECLARE_WORK(tls_device_gc_work, tls_device_gc_task);
static LIST_HEAD(tls_device_gc_list);
static LIST_HEAD(tls_device_list);
+static LIST_HEAD(tls_device_down_list);
static DEFINE_SPINLOCK(tls_device_lock);
static void tls_device_free_ctx(struct tls_context *ctx)
@@ -61,7 +64,7 @@
if (ctx->rx_conf == TLS_HW)
kfree(tls_offload_ctx_rx(ctx));
- tls_ctx_free(ctx);
+ tls_ctx_free(NULL, ctx);
}
static void tls_device_gc_task(struct work_struct *work)
@@ -89,34 +92,21 @@
}
}
-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;
spin_lock_irqsave(&tls_device_lock, flags);
+ if (unlikely(!refcount_dec_and_test(&ctx->refcount)))
+ goto unlock;
+
list_move_tail(&ctx->list, &tls_device_gc_list);
/* schedule_work inside the spinlock
* to make sure tls_device_down waits for that work.
*/
schedule_work(&tls_device_gc_work);
-
+unlock:
spin_unlock_irqrestore(&tls_device_lock, flags);
}
@@ -138,13 +128,10 @@
static void destroy_record(struct tls_record_info *record)
{
- int nr_frags = record->num_frags;
- skb_frag_t *frag;
+ int i;
- while (nr_frags-- > 0) {
- frag = &record->frags[nr_frags];
- __skb_frag_unref(frag);
- }
+ for (i = 0; i < record->num_frags; i++)
+ __skb_frag_unref(&record->frags[i]);
kfree(record);
}
@@ -175,12 +162,8 @@
spin_lock_irqsave(&ctx->lock, flags);
info = ctx->retransmit_hint;
- if (info && !before(acked_seq, info->end_seq)) {
+ if (info && !before(acked_seq, info->end_seq))
ctx->retransmit_hint = NULL;
- list_del(&info->list);
- destroy_record(info);
- deleted_records++;
- }
list_for_each_entry_safe(info, temp, &ctx->records_list, list) {
if (before(acked_seq, info->end_seq))
@@ -214,10 +197,53 @@
clean_acked_data_disable(inet_csk(sk));
}
- if (refcount_dec_and_test(&tls_ctx->refcount))
- tls_device_queue_ctx_destruction(tls_ctx);
+ tls_device_queue_ctx_destruction(tls_ctx);
}
-EXPORT_SYMBOL(tls_device_sk_destruct);
+EXPORT_SYMBOL_GPL(tls_device_sk_destruct);
+
+void tls_device_free_resources_tx(struct sock *sk)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+ tls_free_partial_record(sk, tls_ctx);
+}
+
+void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq)
+{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+
+ trace_tls_device_tx_resync_req(sk, got_seq, exp_seq);
+ WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
+}
+EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request);
+
+static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx,
+ u32 seq)
+{
+ struct net_device *netdev;
+ struct sk_buff *skb;
+ int err = 0;
+ u8 *rcd_sn;
+
+ skb = tcp_write_queue_tail(sk);
+ if (skb)
+ TCP_SKB_CB(skb)->eor = 1;
+
+ rcd_sn = tls_ctx->tx.rec_seq;
+
+ trace_tls_device_tx_resync_send(sk, seq, rcd_sn);
+ down_read(&device_offload_lock);
+ netdev = tls_ctx->netdev;
+ if (netdev)
+ err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq,
+ rcd_sn,
+ TLS_OFFLOAD_CTX_DIR_TX);
+ up_read(&device_offload_lock);
+ if (err)
+ return;
+
+ clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
+}
static void tls_append_frag(struct tls_record_info *record,
struct page_frag *pfrag,
@@ -226,14 +252,14 @@
skb_frag_t *frag;
frag = &record->frags[record->num_frags - 1];
- if (frag->page.p == pfrag->page &&
- frag->page_offset + frag->size == pfrag->offset) {
- frag->size += size;
+ if (skb_frag_page(frag) == pfrag->page &&
+ skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) {
+ skb_frag_size_add(frag, size);
} else {
++frag;
- frag->page.p = pfrag->page;
- frag->page_offset = pfrag->offset;
- frag->size = size;
+ __skb_frag_set_page(frag, pfrag->page);
+ skb_frag_off_set(frag, pfrag->offset);
+ skb_frag_size_set(frag, size);
++record->num_frags;
get_page(pfrag->page);
}
@@ -246,47 +272,66 @@
struct tls_context *ctx,
struct tls_offload_context_tx *offload_ctx,
struct tls_record_info *record,
- struct page_frag *pfrag,
- int flags,
- unsigned char record_type)
+ int flags)
{
+ struct tls_prot_info *prot = &ctx->prot_info;
struct tcp_sock *tp = tcp_sk(sk);
- struct page_frag dummy_tag_frag;
skb_frag_t *frag;
int i;
- /* fill prepend */
- frag = &record->frags[0];
- tls_fill_prepend(ctx,
- skb_frag_address(frag),
- record->len - ctx->tx.prepend_size,
- record_type);
-
- /* HW doesn't care about the data in the tag, because it fills it. */
- dummy_tag_frag.page = skb_frag_page(frag);
- dummy_tag_frag.offset = 0;
-
- tls_append_frag(record, &dummy_tag_frag, ctx->tx.tag_size);
record->end_seq = tp->write_seq + record->len;
- spin_lock_irq(&offload_ctx->lock);
- list_add_tail(&record->list, &offload_ctx->records_list);
- spin_unlock_irq(&offload_ctx->lock);
+ list_add_tail_rcu(&record->list, &offload_ctx->records_list);
offload_ctx->open_record = NULL;
- set_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
- tls_advance_record_sn(sk, &ctx->tx);
+
+ if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags))
+ tls_device_resync_tx(sk, ctx, tp->write_seq);
+
+ tls_advance_record_sn(sk, prot, &ctx->tx);
for (i = 0; i < record->num_frags; i++) {
frag = &record->frags[i];
sg_unmark_end(&offload_ctx->sg_tx_data[i]);
sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag),
- frag->size, frag->page_offset);
- sk_mem_charge(sk, frag->size);
+ skb_frag_size(frag), skb_frag_off(frag));
+ sk_mem_charge(sk, skb_frag_size(frag));
get_page(skb_frag_page(frag));
}
sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]);
/* all ready, send */
return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags);
+}
+
+static int tls_device_record_close(struct sock *sk,
+ struct tls_context *ctx,
+ struct tls_record_info *record,
+ struct page_frag *pfrag,
+ unsigned char record_type)
+{
+ struct tls_prot_info *prot = &ctx->prot_info;
+ int ret;
+
+ /* append tag
+ * device will fill in the tag, we just need to append a placeholder
+ * use socket memory to improve coalescing (re-using a single buffer
+ * increases frag count)
+ * if we can't allocate memory now, steal some back from data
+ */
+ if (likely(skb_page_frag_refill(prot->tag_size, pfrag,
+ sk->sk_allocation))) {
+ ret = 0;
+ tls_append_frag(record, pfrag, prot->tag_size);
+ } else {
+ ret = prot->tag_size;
+ if (record->len <= prot->overhead_size)
+ return -ENOMEM;
+ }
+
+ /* fill prepend */
+ tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
+ record->len - prot->overhead_size,
+ record_type, prot->version);
+ return ret;
}
static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx,
@@ -302,7 +347,7 @@
frag = &record->frags[0];
__skb_frag_set_page(frag, pfrag->page);
- frag->page_offset = pfrag->offset;
+ skb_frag_off_set(frag, pfrag->offset);
skb_frag_size_set(frag, prepend_size);
get_page(pfrag->page);
@@ -324,7 +369,7 @@
if (!offload_ctx->open_record) {
if (unlikely(!skb_page_frag_refill(prepend_size, pfrag,
sk->sk_allocation))) {
- sk->sk_prot->enter_memory_pressure(sk);
+ READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk);
sk_stream_moderate_sndbuf(sk);
return -ENOMEM;
}
@@ -343,15 +388,41 @@
return 0;
}
+static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i)
+{
+ size_t pre_copy, nocache;
+
+ pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1);
+ if (pre_copy) {
+ pre_copy = min(pre_copy, bytes);
+ if (copy_from_iter(addr, pre_copy, i) != pre_copy)
+ return -EFAULT;
+ bytes -= pre_copy;
+ addr += pre_copy;
+ }
+
+ nocache = round_down(bytes, SMP_CACHE_BYTES);
+ if (copy_from_iter_nocache(addr, nocache, i) != nocache)
+ return -EFAULT;
+ bytes -= nocache;
+ addr += nocache;
+
+ if (bytes && copy_from_iter(addr, bytes, i) != bytes)
+ return -EFAULT;
+
+ return 0;
+}
+
static int tls_push_data(struct sock *sk,
struct iov_iter *msg_iter,
size_t size, int flags,
unsigned char record_type)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
- int tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
struct tls_record_info *record = ctx->open_record;
+ int tls_push_record_flags;
struct page_frag *pfrag;
size_t orig_size = size;
u32 max_open_record_len;
@@ -362,15 +433,20 @@
if (flags &
~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_SENDPAGE_NOTLAST))
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
- if (sk->sk_err)
+ if (unlikely(sk->sk_err))
return -sk->sk_err;
+ flags |= MSG_SENDPAGE_DECRYPTED;
+ tls_push_record_flags = flags | MSG_SENDPAGE_NOTLAST;
+
timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
- rc = tls_complete_pending_work(sk, tls_ctx, flags, &timeo);
- if (rc < 0)
- return rc;
+ if (tls_is_partially_sent_record(tls_ctx)) {
+ rc = tls_push_partial_record(sk, tls_ctx, flags);
+ if (rc < 0)
+ return rc;
+ }
pfrag = sk_page_frag(sk);
@@ -378,11 +454,10 @@
* we need to leave room for an authentication tag.
*/
max_open_record_len = TLS_MAX_PAYLOAD_SIZE +
- tls_ctx->tx.prepend_size;
+ prot->prepend_size;
do {
- rc = tls_do_allocation(sk, ctx, pfrag,
- tls_ctx->tx.prepend_size);
- if (rc) {
+ rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size);
+ if (unlikely(rc)) {
rc = sk_stream_wait_memory(sk, &timeo);
if (!rc)
continue;
@@ -399,7 +474,7 @@
size = orig_size;
destroy_record(record);
ctx->open_record = NULL;
- } else if (record->len > tls_ctx->tx.prepend_size) {
+ } else if (record->len > prot->prepend_size) {
goto last_record;
}
@@ -410,13 +485,13 @@
copy = min_t(size_t, size, (pfrag->size - pfrag->offset));
copy = min_t(size_t, copy, (max_open_record_len - record->len));
- if (copy_from_iter_nocache(page_address(pfrag->page) +
- pfrag->offset,
- copy, msg_iter) != copy) {
- rc = -EFAULT;
- goto handle_error;
+ if (copy) {
+ rc = tls_device_copy_data(page_address(pfrag->page) +
+ pfrag->offset, copy, msg_iter);
+ if (rc)
+ goto handle_error;
+ tls_append_frag(record, pfrag, copy);
}
- tls_append_frag(record, pfrag, copy);
size -= copy;
if (!size) {
@@ -432,13 +507,24 @@
if (done || record->len >= max_open_record_len ||
(record->num_frags >= MAX_SKB_FRAGS - 1)) {
+ rc = tls_device_record_close(sk, tls_ctx, record,
+ pfrag, record_type);
+ if (rc) {
+ if (rc > 0) {
+ size += rc;
+ } else {
+ size = orig_size;
+ destroy_record(record);
+ ctx->open_record = NULL;
+ break;
+ }
+ }
+
rc = tls_push_record(sk,
tls_ctx,
ctx,
record,
- pfrag,
- tls_push_record_flags,
- record_type);
+ tls_push_record_flags);
if (rc < 0)
break;
}
@@ -455,8 +541,10 @@
int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
{
unsigned char record_type = TLS_RECORD_TYPE_DATA;
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
int rc;
+ mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
if (unlikely(msg->msg_controllen)) {
@@ -470,12 +558,14 @@
out:
release_sock(sk);
+ mutex_unlock(&tls_ctx->tx_lock);
return rc;
}
int tls_device_sendpage(struct sock *sk, struct page *page,
int offset, size_t size, int flags)
{
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
struct iov_iter msg_iter;
char *kaddr;
struct kvec iov;
@@ -484,23 +574,25 @@
if (flags & MSG_SENDPAGE_NOTLAST)
flags |= MSG_MORE;
+ mutex_lock(&tls_ctx->tx_lock);
lock_sock(sk);
if (flags & MSG_OOB) {
- rc = -ENOTSUPP;
+ rc = -EOPNOTSUPP;
goto out;
}
kaddr = kmap(page);
iov.iov_base = kaddr + offset;
iov.iov_len = size;
- iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, &iov, 1, size);
+ iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
rc = tls_push_data(sk, &msg_iter, size,
flags, TLS_RECORD_TYPE_DATA);
kunmap(page);
out:
release_sock(sk);
+ mutex_unlock(&tls_ctx->tx_lock);
return rc;
}
@@ -516,9 +608,10 @@
/* if retransmit_hint is irrelevant start
* from the beggining of the list
*/
- info = list_first_entry(&context->records_list,
- struct tls_record_info, list);
-
+ info = list_first_entry_or_null(&context->records_list,
+ struct tls_record_info, list);
+ if (!info)
+ return NULL;
/* send the start_marker record if seq number is before the
* tls offload start marker sequence number. This record is
* required to handle TCP packets which are before TLS offload
@@ -540,7 +633,9 @@
record_sn = context->unacked_record_sn;
}
- list_for_each_entry_from(info, &context->records_list, list) {
+ /* We just need the _rcu for the READ_ONCE() */
+ rcu_read_lock();
+ list_for_each_entry_from_rcu(info, &context->records_list, list) {
if (before(seq, info->end_seq)) {
if (!context->retransmit_hint ||
after(info->end_seq,
@@ -549,12 +644,15 @@
context->retransmit_hint = info;
}
*p_record_sn = record_sn;
- return info;
+ goto exit_rcu_unlock;
}
record_sn++;
}
+ info = NULL;
- return NULL;
+exit_rcu_unlock:
+ rcu_read_unlock();
+ return info;
}
EXPORT_SYMBOL(tls_get_record);
@@ -562,43 +660,206 @@
{
struct iov_iter msg_iter;
- iov_iter_kvec(&msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
+ iov_iter_kvec(&msg_iter, WRITE, NULL, 0, 0);
return tls_push_data(sk, &msg_iter, 0, flags, TLS_RECORD_TYPE_DATA);
}
-static void tls_device_resync_rx(struct tls_context *tls_ctx,
- struct sock *sk, u32 seq, u64 rcd_sn)
+void tls_device_write_space(struct sock *sk, struct tls_context *ctx)
{
- struct net_device *netdev;
+ if (tls_is_partially_sent_record(ctx)) {
+ gfp_t sk_allocation = sk->sk_allocation;
- if (WARN_ON(test_and_set_bit(TLS_RX_SYNC_RUNNING, &tls_ctx->flags)))
- return;
- netdev = READ_ONCE(tls_ctx->netdev);
- if (netdev)
- netdev->tlsdev_ops->tls_dev_resync_rx(netdev, sk, seq, rcd_sn);
- clear_bit_unlock(TLS_RX_SYNC_RUNNING, &tls_ctx->flags);
+ WARN_ON_ONCE(sk->sk_write_pending);
+
+ sk->sk_allocation = GFP_ATOMIC;
+ tls_push_partial_record(sk, ctx,
+ MSG_DONTWAIT | MSG_NOSIGNAL |
+ MSG_SENDPAGE_DECRYPTED);
+ sk->sk_allocation = sk_allocation;
+ }
}
-void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
+static void tls_device_resync_rx(struct tls_context *tls_ctx,
+ struct sock *sk, u32 seq, u8 *rcd_sn)
+{
+ struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
+ struct net_device *netdev;
+
+ trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type);
+ rcu_read_lock();
+ netdev = READ_ONCE(tls_ctx->netdev);
+ if (netdev)
+ netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn,
+ TLS_OFFLOAD_CTX_DIR_RX);
+ rcu_read_unlock();
+ TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC);
+}
+
+static bool
+tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async,
+ s64 resync_req, u32 *seq, u16 *rcd_delta)
+{
+ u32 is_async = resync_req & RESYNC_REQ_ASYNC;
+ u32 req_seq = resync_req >> 32;
+ u32 req_end = req_seq + ((resync_req >> 16) & 0xffff);
+ u16 i;
+
+ *rcd_delta = 0;
+
+ if (is_async) {
+ /* shouldn't get to wraparound:
+ * too long in async stage, something bad happened
+ */
+ if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX))
+ return false;
+
+ /* asynchronous stage: log all headers seq such that
+ * req_seq <= seq <= end_seq, and wait for real resync request
+ */
+ if (before(*seq, req_seq))
+ return false;
+ if (!after(*seq, req_end) &&
+ resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX)
+ resync_async->log[resync_async->loglen++] = *seq;
+
+ resync_async->rcd_delta++;
+
+ return false;
+ }
+
+ /* synchronous stage: check against the logged entries and
+ * proceed to check the next entries if no match was found
+ */
+ for (i = 0; i < resync_async->loglen; i++)
+ if (req_seq == resync_async->log[i] &&
+ atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) {
+ *rcd_delta = resync_async->rcd_delta - i;
+ *seq = req_seq;
+ resync_async->loglen = 0;
+ resync_async->rcd_delta = 0;
+ return true;
+ }
+
+ resync_async->loglen = 0;
+ resync_async->rcd_delta = 0;
+
+ if (req_seq == *seq &&
+ atomic64_try_cmpxchg(&resync_async->req,
+ &resync_req, 0))
+ return true;
+
+ return false;
+}
+
+void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_offload_context_rx *rx_ctx;
- u32 is_req_pending;
+ u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
+ u32 sock_data, is_req_pending;
+ struct tls_prot_info *prot;
s64 resync_req;
+ u16 rcd_delta;
u32 req_seq;
if (tls_ctx->rx_conf != TLS_HW)
return;
+ if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags)))
+ return;
+ prot = &tls_ctx->prot_info;
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;
+ memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
- if (unlikely(is_req_pending) && req_seq == seq &&
- atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) {
+ switch (rx_ctx->resync_type) {
+ case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ:
+ resync_req = atomic64_read(&rx_ctx->resync_req);
+ req_seq = resync_req >> 32;
seq += TLS_HEADER_SIZE - 1;
- tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
+ is_req_pending = resync_req;
+
+ if (likely(!is_req_pending) || req_seq != seq ||
+ !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
+ return;
+ break;
+ case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT:
+ if (likely(!rx_ctx->resync_nh_do_now))
+ return;
+
+ /* head of next rec is already in, note that the sock_inq will
+ * include the currently parsed message when called from parser
+ */
+ sock_data = tcp_inq(sk);
+ if (sock_data > rcd_len) {
+ trace_tls_device_rx_resync_nh_delay(sk, sock_data,
+ rcd_len);
+ return;
+ }
+
+ rx_ctx->resync_nh_do_now = 0;
+ seq += rcd_len;
+ tls_bigint_increment(rcd_sn, prot->rec_seq_size);
+ break;
+ case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC:
+ resync_req = atomic64_read(&rx_ctx->resync_async->req);
+ is_req_pending = resync_req;
+ if (likely(!is_req_pending))
+ return;
+
+ if (!tls_device_rx_resync_async(rx_ctx->resync_async,
+ resync_req, &seq, &rcd_delta))
+ return;
+ tls_bigint_subtract(rcd_sn, rcd_delta);
+ break;
+ }
+
+ tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
+}
+
+static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
+ struct tls_offload_context_rx *ctx,
+ struct sock *sk, struct sk_buff *skb)
+{
+ struct strp_msg *rxm;
+
+ /* device will request resyncs by itself based on stream scan */
+ if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT)
+ return;
+ /* already scheduled */
+ if (ctx->resync_nh_do_now)
+ return;
+ /* seen decrypted fragments since last fully-failed record */
+ if (ctx->resync_nh_reset) {
+ ctx->resync_nh_reset = 0;
+ ctx->resync_nh.decrypted_failed = 1;
+ ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL;
+ return;
+ }
+
+ if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt)
+ return;
+
+ /* doing resync, bump the next target in case it fails */
+ if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL)
+ ctx->resync_nh.decrypted_tgt *= 2;
+ else
+ ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL;
+
+ rxm = strp_msg(skb);
+
+ /* head of next rec is already in, parser will sync for us */
+ if (tcp_inq(sk) > rxm->full_len) {
+ trace_tls_device_rx_resync_nh_schedule(sk);
+ ctx->resync_nh_do_now = 1;
+ } else {
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
+ u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE];
+
+ memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size);
+ tls_bigint_increment(rcd_sn, prot->rec_seq_size);
+
+ tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq,
+ rcd_sn);
}
}
@@ -626,8 +887,10 @@
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);
+ err = skb_copy_bits(skb, offset, buf,
+ TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
+ if (err)
+ goto free_buf;
/* We are interested only in the decrypted data not the auth */
err = decrypt_skb(sk, skb, sg);
@@ -641,8 +904,11 @@
if (skb_pagelen(skb) > offset) {
copy = min_t(int, skb_pagelen(skb) - offset, data_len);
- if (skb->decrypted)
- skb_store_bits(skb, offset, buf, copy);
+ if (skb->decrypted) {
+ err = skb_store_bits(skb, offset, buf, copy);
+ if (err)
+ goto free_buf;
+ }
offset += copy;
buf += copy;
@@ -665,8 +931,11 @@
copy = min_t(int, skb_iter->len - frag_pos,
data_len + rxm->offset - offset);
- if (skb_iter->decrypted)
- skb_store_bits(skb_iter, frag_pos, buf, copy);
+ if (skb_iter->decrypted) {
+ err = skb_store_bits(skb_iter, frag_pos, buf, copy);
+ if (err)
+ goto free_buf;
+ }
offset += copy;
buf += copy;
@@ -679,17 +948,13 @@
return err;
}
-int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
+int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx,
+ struct sk_buff *skb, struct strp_msg *rxm)
{
- 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) {
@@ -697,41 +962,79 @@
is_encrypted &= !skb_iter->decrypted;
}
+ trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
+ tls_ctx->rx.rec_seq, rxm->full_len,
+ is_encrypted, is_decrypted);
+
ctx->sw.decrypted |= is_decrypted;
- /* Return immedeatly if the record is either entirely plaintext or
+ if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) {
+ if (likely(is_encrypted || is_decrypted))
+ return 0;
+
+ /* After tls_device_down disables the offload, the next SKB will
+ * likely have initial fragments decrypted, and final ones not
+ * decrypted. We need to reencrypt that single SKB.
+ */
+ return tls_device_reencrypt(sk, skb);
+ }
+
+ /* Return immediately 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);
+ if (is_decrypted) {
+ ctx->resync_nh_reset = 1;
+ return 0;
+ }
+ if (is_encrypted) {
+ tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb);
+ return 0;
+ }
+
+ ctx->resync_nh_reset = 1;
+ return tls_device_reencrypt(sk, skb);
+}
+
+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;
+ smp_store_release(&sk->sk_destruct, tls_device_sk_destruct);
+ }
}
int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
{
u16 nonce_size, tag_size, iv_size, rec_seq_size;
+ struct tls_context *tls_ctx = tls_get_ctx(sk);
+ struct tls_prot_info *prot = &tls_ctx->prot_info;
struct tls_record_info *start_marker_record;
struct tls_offload_context_tx *offload_ctx;
struct tls_crypto_info *crypto_info;
struct net_device *netdev;
char *iv, *rec_seq;
struct sk_buff *skb;
- int rc = -EINVAL;
__be64 rcd_sn;
+ int rc;
if (!ctx)
- goto out;
+ return -EINVAL;
- if (ctx->priv_ctx_tx) {
- rc = -EEXIST;
- goto out;
- }
+ if (ctx->priv_ctx_tx)
+ return -EEXIST;
start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
- if (!start_marker_record) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!start_marker_record)
+ return -ENOMEM;
offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
if (!offload_ctx) {
@@ -740,6 +1043,11 @@
}
crypto_info = &ctx->crypto_send.info;
+ if (crypto_info->version != TLS_1_2_VERSION) {
+ rc = -EOPNOTSUPP;
+ goto free_offload_ctx;
+ }
+
switch (crypto_info->cipher_type) {
case TLS_CIPHER_AES_GCM_128:
nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
@@ -755,10 +1063,18 @@
goto free_offload_ctx;
}
- ctx->tx.prepend_size = TLS_HEADER_SIZE + nonce_size;
- ctx->tx.tag_size = tag_size;
- ctx->tx.overhead_size = ctx->tx.prepend_size + ctx->tx.tag_size;
- ctx->tx.iv_size = iv_size;
+ /* Sanity-check the rec_seq_size for stack allocations */
+ if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
+ rc = -EINVAL;
+ goto free_offload_ctx;
+ }
+
+ prot->version = crypto_info->version;
+ prot->cipher_type = crypto_info->cipher_type;
+ prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
+ prot->tag_size = tag_size;
+ prot->overhead_size = prot->prepend_size + prot->tag_size;
+ prot->iv_size = iv_size;
ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
GFP_KERNEL);
if (!ctx->tx.iv) {
@@ -768,7 +1084,7 @@
memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
- ctx->tx.rec_seq_size = rec_seq_size;
+ prot->rec_seq_size = rec_seq_size;
ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
if (!ctx->tx.rec_seq) {
rc = -ENOMEM;
@@ -804,41 +1120,43 @@
if (skb)
TCP_SKB_CB(skb)->eor = 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
- * 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;
+ goto disable_cad;
}
if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
- rc = -ENOTSUPP;
+ rc = -EOPNOTSUPP;
goto release_netdev;
}
/* Avoid offloading if the device is down
* We don't want to offload new flows after
* the NETDEV_DOWN event
+ *
+ * device_offload_lock is taken in tls_devices's NETDEV_DOWN
+ * handler thus protecting from the device going down before
+ * ctx was added to tls_device_list.
*/
+ down_read(&device_offload_lock);
if (!(netdev->flags & IFF_UP)) {
rc = -EINVAL;
- goto release_netdev;
+ goto release_lock;
}
ctx->priv_ctx_tx = offload_ctx;
rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX,
&ctx->crypto_send.info,
tcp_sk(sk)->write_seq);
+ trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX,
+ tcp_sk(sk)->write_seq, rec_seq, rc);
if (rc)
- goto release_netdev;
+ goto release_lock;
tls_device_attach(ctx, sk, netdev);
+ up_read(&device_offload_lock);
/* following this assignment tls_is_sk_tx_device_offloaded
* will return true and the context might be accessed
@@ -846,13 +1164,14 @@
*/
smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb);
dev_put(netdev);
- up_read(&device_offload_lock);
- goto out;
-release_netdev:
- dev_put(netdev);
+ return 0;
+
release_lock:
up_read(&device_offload_lock);
+release_netdev:
+ dev_put(netdev);
+disable_cad:
clean_acked_data_disable(inet_csk(sk));
crypto_free_aead(offload_ctx->aead_send);
free_rec_seq:
@@ -864,50 +1183,50 @@
ctx->priv_ctx_tx = NULL;
free_marker_record:
kfree(start_marker_record);
-out:
return rc;
}
int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
{
+ struct tls12_crypto_info_aes_gcm_128 *info;
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);
+ if (ctx->crypto_recv.info.version != TLS_1_2_VERSION)
+ return -EOPNOTSUPP;
+
netdev = get_netdev_for_sock(sk);
if (!netdev) {
pr_err_ratelimited("%s: netdev not found\n", __func__);
- rc = -EINVAL;
- goto release_lock;
+ return -EINVAL;
}
if (!(netdev->features & NETIF_F_HW_TLS_RX)) {
- pr_err_ratelimited("%s: netdev %s with no TLS offload\n",
- __func__, netdev->name);
- rc = -ENOTSUPP;
+ rc = -EOPNOTSUPP;
goto release_netdev;
}
/* Avoid offloading if the device is down
* We don't want to offload new flows after
* the NETDEV_DOWN event
+ *
+ * device_offload_lock is taken in tls_devices's NETDEV_DOWN
+ * handler thus protecting from the device going down before
+ * ctx was added to tls_device_list.
*/
+ down_read(&device_offload_lock);
if (!(netdev->flags & IFF_UP)) {
rc = -EINVAL;
- goto release_netdev;
+ goto release_lock;
}
context = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_RX, GFP_KERNEL);
if (!context) {
rc = -ENOMEM;
- goto release_netdev;
+ goto release_lock;
}
+ context->resync_nh_reset = 1;
ctx->priv_ctx_rx = context;
rc = tls_set_sw_offload(sk, ctx, 0);
@@ -917,14 +1236,18 @@
rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX,
&ctx->crypto_recv.info,
tcp_sk(sk)->copied_seq);
- if (rc) {
- pr_err_ratelimited("%s: The netdev has refused to offload this socket\n",
- __func__);
+ info = (void *)&ctx->crypto_recv.info;
+ trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX,
+ tcp_sk(sk)->copied_seq, info->rec_seq, rc);
+ if (rc)
goto free_sw_resources;
- }
tls_device_attach(ctx, sk, netdev);
- goto release_netdev;
+ up_read(&device_offload_lock);
+
+ dev_put(netdev);
+
+ return 0;
free_sw_resources:
up_read(&device_offload_lock);
@@ -932,10 +1255,10 @@
down_read(&device_offload_lock);
release_ctx:
ctx->priv_ctx_rx = NULL;
-release_netdev:
- dev_put(netdev);
release_lock:
up_read(&device_offload_lock);
+release_netdev:
+ dev_put(netdev);
return rc;
}
@@ -983,6 +1306,26 @@
spin_unlock_irqrestore(&tls_device_lock, flags);
list_for_each_entry_safe(ctx, tmp, &list, list) {
+ /* Stop offloaded TX and switch to the fallback.
+ * tls_is_sk_tx_device_offloaded will return false.
+ */
+ WRITE_ONCE(ctx->sk->sk_validate_xmit_skb, tls_validate_xmit_skb_sw);
+
+ /* Stop the RX and TX resync.
+ * tls_dev_resync must not be called after tls_dev_del.
+ */
+ WRITE_ONCE(ctx->netdev, NULL);
+
+ /* Start skipping the RX resync logic completely. */
+ set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags);
+
+ /* Sync with inflight packets. After this point:
+ * TX: no non-encrypted packets will be passed to the driver.
+ * RX: resync requests from the driver will be ignored.
+ */
+ synchronize_net();
+
+ /* Release the offload context on the driver side. */
if (ctx->tx_conf == TLS_HW)
netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
TLS_OFFLOAD_CTX_DIR_TX);
@@ -990,15 +1333,29 @@
!test_bit(TLS_RX_DEV_CLOSED, &ctx->flags))
netdev->tlsdev_ops->tls_dev_del(netdev, ctx,
TLS_OFFLOAD_CTX_DIR_RX);
- WRITE_ONCE(ctx->netdev, NULL);
- smp_mb__before_atomic(); /* pairs with test_and_set_bit() */
- while (test_bit(TLS_RX_SYNC_RUNNING, &ctx->flags))
- usleep_range(10, 200);
- dev_put(netdev);
- list_del_init(&ctx->list);
- if (refcount_dec_and_test(&ctx->refcount))
+ dev_put(netdev);
+
+ /* Move the context to a separate list for two reasons:
+ * 1. When the context is deallocated, list_del is called.
+ * 2. It's no longer an offloaded context, so we don't want to
+ * run offload-specific code on this context.
+ */
+ spin_lock_irqsave(&tls_device_lock, flags);
+ list_move_tail(&ctx->list, &tls_device_down_list);
+ spin_unlock_irqrestore(&tls_device_lock, flags);
+
+ /* Device contexts for RX and TX will be freed in on sk_destruct
+ * by tls_device_free_ctx. rx_conf and tx_conf stay in TLS_HW.
+ * Now release the ref taken above.
+ */
+ if (refcount_dec_and_test(&ctx->refcount)) {
+ /* sk_destruct ran after tls_device_down took a ref, and
+ * it returned early. Complete the destruction here.
+ */
+ list_del(&ctx->list);
tls_device_free_ctx(ctx);
+ }
}
up_write(&device_offload_lock);
@@ -1021,7 +1378,7 @@
case NETDEV_REGISTER:
case NETDEV_FEAT_CHANGE:
if ((dev->features & NETIF_F_HW_TLS_RX) &&
- !dev->tlsdev_ops->tls_dev_resync_rx)
+ !dev->tlsdev_ops->tls_dev_resync)
return NOTIFY_BAD;
if (dev->tlsdev_ops &&
@@ -1040,13 +1397,14 @@
.notifier_call = tls_dev_event,
};
-void __init tls_device_init(void)
+int __init tls_device_init(void)
{
- register_netdevice_notifier(&tls_dev_notifier);
+ return register_netdevice_notifier(&tls_dev_notifier);
}
void __exit tls_device_cleanup(void)
{
unregister_netdevice_notifier(&tls_dev_notifier);
flush_work(&tls_device_gc_work);
+ clean_acked_data_flush();
}
--
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