* @brief Session and session manager
*/
+#include <vnet/plugin/plugin.h>
#include <vnet/session/session.h>
#include <vnet/session/application.h>
#include <vnet/dpo/load_balance.h>
|| s->session_state <= SESSION_STATE_LISTENING)
return 1;
- if (s->session_state == SESSION_STATE_CONNECTING &&
+ if ((s->session_state == SESSION_STATE_CONNECTING ||
+ s->session_state == SESSION_STATE_TRANSPORT_CLOSED) &&
(s->flags & SESSION_F_HALF_OPEN))
return 1;
tc = session_get_transport (s);
- if (s->connection_index != tc->c_index
- || s->thread_index != tc->thread_index || tc->s_index != si)
+ if (s->connection_index != tc->c_index ||
+ s->thread_index != tc->thread_index || tc->s_index != si)
return 0;
return 1;
}
+void
+session_cleanup (session_t *s)
+{
+ segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
+ session_free (s);
+}
+
static void
session_cleanup_notify (session_t * s, session_cleanup_ntf_t ntf)
{
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (!app_wrk)
- return;
+ {
+ if (ntf == SESSION_CLEANUP_TRANSPORT)
+ return;
+
+ session_cleanup (s);
+ return;
+ }
app_worker_cleanup_notify (app_wrk, s, ntf);
}
void
-session_free_w_fifos (session_t * s)
+session_program_cleanup (session_t *s)
{
+ ASSERT (s->session_state == SESSION_STATE_TRANSPORT_DELETED);
session_cleanup_notify (s, SESSION_CLEANUP_SESSION);
- segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
- session_free (s);
}
/**
if ((rv = session_lookup_del_session (s)))
clib_warning ("session %u hash delete rv %d", s->session_index, rv);
- session_free_w_fifos (s);
+ session_program_cleanup (s);
}
void
transport_cleanup (session_get_transport_proto (ho),
ho->connection_index, ho->app_index /* overloaded */);
}
- else
+ else if (ho->session_state != SESSION_STATE_TRANSPORT_DELETED)
{
/* Cleanup half-open session lookup table if need be */
if (ho->session_state != SESSION_STATE_TRANSPORT_CLOSED)
app_wrk = app_worker_get_if_valid (ho->app_wrk_index);
if (app_wrk)
app_worker_del_half_open (app_wrk, ho);
- session_free (ho);
+ else
+ session_free (ho);
}
static void
if (!(tc->flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
session_lookup_del_half_open (tc);
}
+ session_set_state (ho, SESSION_STATE_TRANSPORT_DELETED);
/* Notification from ctrl thread accepted without rpc */
if (tc->thread_index == transport_cl_thread ())
}
}
+void
+session_wrk_program_app_wrk_evts (session_worker_t *wrk, u32 app_wrk_index)
+{
+ u8 need_interrupt;
+
+ ASSERT ((wrk - session_main.wrk) == vlib_get_thread_index ());
+ need_interrupt = clib_bitmap_is_zero (wrk->app_wrks_pending_ntf);
+ wrk->app_wrks_pending_ntf =
+ clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk_index, 1);
+
+ if (need_interrupt)
+ vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
+}
+
+always_inline void
+session_program_io_event (app_worker_t *app_wrk, session_t *s,
+ session_evt_type_t et, u8 is_cl)
+{
+ if (is_cl)
+ {
+ /* Special events for connectionless sessions */
+ et += SESSION_IO_EVT_BUILTIN_RX - SESSION_IO_EVT_RX;
+
+ ASSERT (s->thread_index == 0);
+ session_event_t evt = {
+ .event_type = et,
+ .session_handle = session_handle (s),
+ };
+
+ app_worker_add_event_custom (app_wrk, vlib_get_thread_index (), &evt);
+ }
+ else
+ {
+ app_worker_add_event (app_wrk, s, et);
+ }
+}
+
+static inline int
+session_notify_subscribers (u32 app_index, session_t *s, svm_fifo_t *f,
+ session_evt_type_t evt_type)
+{
+ app_worker_t *app_wrk;
+ application_t *app;
+ u8 is_cl;
+ int i;
+
+ app = application_get (app_index);
+ if (!app)
+ return -1;
+
+ is_cl = s->thread_index != vlib_get_thread_index ();
+ for (i = 0; i < f->shr->n_subscribers; i++)
+ {
+ app_wrk = application_get_worker (app, f->shr->subscribers[i]);
+ if (!app_wrk)
+ continue;
+ session_program_io_event (app_wrk, s, evt_type, is_cl ? 1 : 0);
+ }
+
+ return 0;
+}
+
+always_inline int
+session_enqueue_notify_inline (session_t *s, u8 is_cl)
+{
+ app_worker_t *app_wrk;
+
+ app_wrk = app_worker_get_if_valid (s->app_wrk_index);
+ if (PREDICT_FALSE (!app_wrk))
+ return -1;
+
+ session_program_io_event (app_wrk, s, SESSION_IO_EVT_RX, is_cl);
+
+ if (PREDICT_FALSE (svm_fifo_n_subscribers (s->rx_fifo)))
+ return session_notify_subscribers (app_wrk->app_index, s, s->rx_fifo,
+ SESSION_IO_EVT_RX);
+
+ return 0;
+}
+
+int
+session_enqueue_notify (session_t *s)
+{
+ return session_enqueue_notify_inline (s, 0 /* is_cl */);
+}
+
+int
+session_enqueue_notify_cl (session_t *s)
+{
+ return session_enqueue_notify_inline (s, 1 /* is_cl */);
+}
+
+int
+session_dequeue_notify (session_t *s)
+{
+ app_worker_t *app_wrk;
+ u8 is_cl;
+
+ /* Unset as soon as event is requested */
+ svm_fifo_clear_deq_ntf (s->tx_fifo);
+
+ app_wrk = app_worker_get_if_valid (s->app_wrk_index);
+ if (PREDICT_FALSE (!app_wrk))
+ return -1;
+
+ is_cl = s->session_state == SESSION_STATE_LISTENING ||
+ s->session_state == SESSION_STATE_OPENED;
+ session_program_io_event (app_wrk, s, SESSION_IO_EVT_TX, is_cl ? 1 : 0);
+
+ if (PREDICT_FALSE (svm_fifo_n_subscribers (s->tx_fifo)))
+ return session_notify_subscribers (app_wrk->app_index, s, s->tx_fifo,
+ SESSION_IO_EVT_TX);
+
+ return 0;
+}
+
+/**
+ * Flushes queue of sessions that are to be notified of new data
+ * enqueued events.
+ *
+ * @param transport_proto transport protocol for which queue to be flushed
+ * @param thread_index Thread index for which the flush is to be performed.
+ * @return 0 on success or a positive number indicating the number of
+ * failures due to API queue being full.
+ */
+void
+session_main_flush_enqueue_events (transport_proto_t transport_proto,
+ u32 thread_index)
+{
+ session_worker_t *wrk = session_main_get_worker (thread_index);
+ session_handle_t *handles;
+ session_t *s;
+ u32 i;
+
+ handles = wrk->session_to_enqueue[transport_proto];
+
+ for (i = 0; i < vec_len (handles); i++)
+ {
+ s = session_get_from_handle (handles[i]);
+ session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED,
+ 0 /* TODO/not needed */);
+ session_enqueue_notify_inline (s,
+ s->thread_index != thread_index ? 1 : 0);
+ }
+
+ vec_reset_length (handles);
+ wrk->session_to_enqueue[transport_proto] = handles;
+}
+
/*
- * Enqueue data for delivery to session peer. Does not notify peer of enqueue
- * event but on request can queue notification events for later delivery by
- * calling stream_server_flush_enqueue_events().
+ * Enqueue data for delivery to app. If requested, it queues app notification
+ * event for later delivery.
*
* @param tc Transport connection which is to be enqueued data
* @param b Buffer to be enqueued
if (queue_event)
{
- /* Queue RX event on this fifo. Eventually these will need to be flushed
- * by calling stream_server_flush_enqueue_events () */
- session_worker_t *wrk;
-
- wrk = session_main_get_worker (s->thread_index);
+ /* Queue RX event on this fifo. Eventually these will need to be
+ * flushed by calling @ref session_main_flush_enqueue_events () */
if (!(s->flags & SESSION_F_RX_EVT))
{
+ session_worker_t *wrk = session_main_get_worker (s->thread_index);
+ ASSERT (s->thread_index == vlib_get_thread_index ());
s->flags |= SESSION_F_RX_EVT;
- vec_add1 (wrk->session_to_enqueue[tc->proto], s->session_index);
+ vec_add1 (wrk->session_to_enqueue[tc->proto], session_handle (s));
}
session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED, 0);
return enqueued;
}
-int
-session_enqueue_dgram_connection (session_t * s,
- session_dgram_hdr_t * hdr,
- vlib_buffer_t * b, u8 proto, u8 queue_event)
+always_inline int
+session_enqueue_dgram_connection_inline (session_t *s,
+ session_dgram_hdr_t *hdr,
+ vlib_buffer_t *b, u8 proto,
+ u8 queue_event, u32 is_cl)
{
int rv;
if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
{
- /* *INDENT-OFF* */
svm_fifo_seg_t segs[2] = {
{ (u8 *) hdr, sizeof (*hdr) },
{ vlib_buffer_get_current (b), b->current_length }
};
- /* *INDENT-ON* */
rv = svm_fifo_enqueue_segments (s->rx_fifo, segs, 2,
0 /* allow_partial */ );
if (queue_event && rv > 0)
{
- /* Queue RX event on this fifo. Eventually these will need to be flushed
- * by calling stream_server_flush_enqueue_events () */
- session_worker_t *wrk;
-
- wrk = session_main_get_worker (s->thread_index);
+ /* Queue RX event on this fifo. Eventually these will need to be
+ * flushed by calling @ref session_main_flush_enqueue_events () */
if (!(s->flags & SESSION_F_RX_EVT))
{
+ u32 thread_index =
+ is_cl ? vlib_get_thread_index () : s->thread_index;
+ session_worker_t *wrk = session_main_get_worker (thread_index);
+ ASSERT (s->thread_index == vlib_get_thread_index () || is_cl);
s->flags |= SESSION_F_RX_EVT;
- vec_add1 (wrk->session_to_enqueue[proto], s->session_index);
+ vec_add1 (wrk->session_to_enqueue[proto], session_handle (s));
}
session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED, 0);
return rv > 0 ? rv : 0;
}
+int
+session_enqueue_dgram_connection (session_t *s, session_dgram_hdr_t *hdr,
+ vlib_buffer_t *b, u8 proto, u8 queue_event)
+{
+ return session_enqueue_dgram_connection_inline (s, hdr, b, proto,
+ queue_event, 0 /* is_cl */);
+}
+
+int
+session_enqueue_dgram_connection_cl (session_t *s, session_dgram_hdr_t *hdr,
+ vlib_buffer_t *b, u8 proto,
+ u8 queue_event)
+{
+ return session_enqueue_dgram_connection_inline (s, hdr, b, proto,
+ queue_event, 1 /* is_cl */);
+}
+
int
session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
u32 offset, u32 max_bytes)
return rv;
}
-static inline int
-session_notify_subscribers (u32 app_index, session_t * s,
- svm_fifo_t * f, session_evt_type_t evt_type)
-{
- app_worker_t *app_wrk;
- application_t *app;
- int i;
-
- app = application_get (app_index);
- if (!app)
- return -1;
-
- for (i = 0; i < f->shr->n_subscribers; i++)
- {
- app_wrk = application_get_worker (app, f->shr->subscribers[i]);
- if (!app_wrk)
- continue;
- if (app_worker_lock_and_send_event (app_wrk, s, evt_type))
- return -1;
- }
-
- return 0;
-}
-
-/**
- * Notify session peer that new data has been enqueued.
- *
- * @param s Stream session for which the event is to be generated.
- * @param lock Flag to indicate if call should lock message queue.
- *
- * @return 0 on success or negative number if failed to send notification.
- */
-static inline int
-session_enqueue_notify_inline (session_t * s)
-{
- app_worker_t *app_wrk;
- u32 session_index;
- u8 n_subscribers;
- u32 thread_index;
-
- session_index = s->session_index;
- thread_index = s->thread_index;
- n_subscribers = svm_fifo_n_subscribers (s->rx_fifo);
-
- app_wrk = app_worker_get_if_valid (s->app_wrk_index);
- if (PREDICT_FALSE (!app_wrk))
- {
- SESSION_DBG ("invalid s->app_index = %d", s->app_wrk_index);
- return 0;
- }
-
- SESSION_EVT (SESSION_EVT_ENQ, s, svm_fifo_max_dequeue_prod (s->rx_fifo));
-
- s->flags &= ~SESSION_F_RX_EVT;
-
- /* Application didn't confirm accept yet */
- if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING))
- return 0;
-
- if (PREDICT_FALSE (app_worker_lock_and_send_event (app_wrk, s,
- SESSION_IO_EVT_RX)))
- return -1;
-
- if (PREDICT_FALSE (n_subscribers))
- {
- s = session_get (session_index, thread_index);
- return session_notify_subscribers (app_wrk->app_index, s,
- s->rx_fifo, SESSION_IO_EVT_RX);
- }
-
- return 0;
-}
-
-int
-session_enqueue_notify (session_t * s)
-{
- return session_enqueue_notify_inline (s);
-}
-
-static void
-session_enqueue_notify_rpc (void *arg)
-{
- u32 session_index = pointer_to_uword (arg);
- session_t *s;
-
- s = session_get_if_valid (session_index, vlib_get_thread_index ());
- if (!s)
- return;
-
- session_enqueue_notify (s);
-}
-
-/**
- * Like session_enqueue_notify, but can be called from a thread that does not
- * own the session.
- */
-void
-session_enqueue_notify_thread (session_handle_t sh)
-{
- u32 thread_index = session_thread_from_handle (sh);
- u32 session_index = session_index_from_handle (sh);
-
- /*
- * Pass session index (u32) as opposed to handle (u64) in case pointers
- * are not 64-bit.
- */
- session_send_rpc_evt_to_thread (thread_index,
- session_enqueue_notify_rpc,
- uword_to_pointer (session_index, void *));
-}
-
-int
-session_dequeue_notify (session_t * s)
-{
- app_worker_t *app_wrk;
-
- svm_fifo_clear_deq_ntf (s->tx_fifo);
-
- app_wrk = app_worker_get_if_valid (s->app_wrk_index);
- if (PREDICT_FALSE (!app_wrk))
- return -1;
-
- if (PREDICT_FALSE (app_worker_lock_and_send_event (app_wrk, s,
- SESSION_IO_EVT_TX)))
- return -1;
-
- if (PREDICT_FALSE (s->tx_fifo->shr->n_subscribers))
- return session_notify_subscribers (app_wrk->app_index, s,
- s->tx_fifo, SESSION_IO_EVT_TX);
-
- return 0;
-}
-
-/**
- * Flushes queue of sessions that are to be notified of new data
- * enqueued events.
- *
- * @param thread_index Thread index for which the flush is to be performed.
- * @return 0 on success or a positive number indicating the number of
- * failures due to API queue being full.
- */
-int
-session_main_flush_enqueue_events (u8 transport_proto, u32 thread_index)
-{
- session_worker_t *wrk = session_main_get_worker (thread_index);
- session_t *s;
- int i, errors = 0;
- u32 *indices;
-
- indices = wrk->session_to_enqueue[transport_proto];
-
- for (i = 0; i < vec_len (indices); i++)
- {
- s = session_get_if_valid (indices[i], thread_index);
- if (PREDICT_FALSE (!s))
- {
- errors++;
- continue;
- }
-
- session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED,
- 0 /* TODO/not needed */ );
-
- if (PREDICT_FALSE (session_enqueue_notify_inline (s)))
- errors++;
- }
-
- vec_reset_length (indices);
- wrk->session_to_enqueue[transport_proto] = indices;
-
- return errors;
-}
-
-int
-session_main_flush_all_enqueue_events (u8 transport_proto)
-{
- vlib_thread_main_t *vtm = vlib_get_thread_main ();
- int i, errors = 0;
- for (i = 0; i < 1 + vtm->n_threads; i++)
- errors += session_main_flush_enqueue_events (transport_proto, i);
- return errors;
-}
-
int
session_stream_connect_notify (transport_connection_t * tc,
session_error_t err)
s = session_alloc_for_connection (tc);
session_set_state (s, SESSION_STATE_CONNECTING);
s->app_wrk_index = app_wrk->wrk_index;
+ s->opaque = opaque;
new_si = s->session_index;
new_ti = s->thread_index;
return 0;
}
-typedef union session_switch_pool_reply_args_
-{
- struct
- {
- u32 session_index;
- u16 thread_index;
- u8 is_closed;
- };
- u64 as_u64;
-} session_switch_pool_reply_args_t;
-
-STATIC_ASSERT (sizeof (session_switch_pool_reply_args_t) <= sizeof (uword),
- "switch pool reply args size");
-
static void
-session_switch_pool_reply (void *arg)
+session_switch_pool_closed_rpc (void *arg)
{
- session_switch_pool_reply_args_t rargs;
+ session_handle_t sh;
session_t *s;
- rargs.as_u64 = pointer_to_uword (arg);
- s = session_get_if_valid (rargs.session_index, rargs.thread_index);
+ sh = pointer_to_uword (arg);
+ s = session_get_from_handle_if_valid (sh);
if (!s)
return;
- /* Session closed during migration. Clean everything up */
- if (rargs.is_closed)
- {
- transport_cleanup (session_get_transport_proto (s), s->connection_index,
- s->thread_index);
- segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
- session_free (s);
- return;
- }
-
- /* Notify app that it has data on the new session */
- session_enqueue_notify (s);
+ transport_cleanup (session_get_transport_proto (s), s->connection_index,
+ s->thread_index);
+ session_cleanup (s);
}
typedef struct _session_switch_pool_args
session_switch_pool (void *cb_args)
{
session_switch_pool_args_t *args = (session_switch_pool_args_t *) cb_args;
- session_switch_pool_reply_args_t rargs;
- session_handle_t new_sh;
+ session_handle_t sh, new_sh;
segment_manager_t *sm;
app_worker_t *app_wrk;
session_t *s;
ASSERT (args->thread_index == vlib_get_thread_index ());
s = session_get (args->session_index, args->thread_index);
- /* Check if session closed during migration */
- rargs.is_closed = s->session_state >= SESSION_STATE_TRANSPORT_CLOSING;
+ app_wrk = app_worker_get_if_valid (s->app_wrk_index);
+ if (!app_wrk)
+ goto app_closed;
- transport_cleanup (session_get_transport_proto (s), s->connection_index,
- s->thread_index);
+ /* Cleanup fifo segment slice state for fifos */
+ sm = app_worker_get_connect_segment_manager (app_wrk);
+ segment_manager_detach_fifo (sm, &s->rx_fifo);
+ segment_manager_detach_fifo (sm, &s->tx_fifo);
- app_wrk = app_worker_get_if_valid (s->app_wrk_index);
- if (app_wrk)
- {
- /* Cleanup fifo segment slice state for fifos */
- sm = app_worker_get_connect_segment_manager (app_wrk);
- segment_manager_detach_fifo (sm, &s->rx_fifo);
- segment_manager_detach_fifo (sm, &s->tx_fifo);
+ /* Check if session closed during migration */
+ if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
+ goto app_closed;
- /* Notify app, using old session, about the migration event */
- if (!rargs.is_closed)
- {
- new_sh = session_make_handle (args->new_session_index,
- args->new_thread_index);
- app_worker_migrate_notify (app_wrk, s, new_sh);
- }
- }
+ new_sh =
+ session_make_handle (args->new_session_index, args->new_thread_index);
+ app_worker_migrate_notify (app_wrk, s, new_sh);
- /* Trigger app read and fifo updates on the new thread */
- rargs.session_index = args->new_session_index;
- rargs.thread_index = args->new_thread_index;
- session_send_rpc_evt_to_thread (args->new_thread_index,
- session_switch_pool_reply,
- uword_to_pointer (rargs.as_u64, void *));
+ clib_mem_free (cb_args);
+ return;
- session_free (s);
+app_closed:
+ /* Session closed during migration. Clean everything up */
+ sh = session_handle (s);
+ session_send_rpc_evt_to_thread (args->new_thread_index,
+ session_switch_pool_closed_rpc,
+ uword_to_pointer (sh, void *));
clib_mem_free (cb_args);
}
break;
case SESSION_STATE_CLOSED:
session_cleanup_notify (s, SESSION_CLEANUP_TRANSPORT);
+ session_set_state (s, SESSION_STATE_TRANSPORT_DELETED);
session_delete (s);
break;
default:
app_wrk = app_worker_get (rmt->app_wrk_index);
s = session_alloc_for_connection (tc);
s->app_wrk_index = app_wrk->wrk_index;
+ s->opaque = rmt->opaque;
session_set_state (s, SESSION_STATE_OPENED);
if (app_worker_init_connected (app_wrk, s))
{
session_set_state (s, SESSION_STATE_CLOSED);
/* If transport is already deleted, just free the session */
else if (s->session_state >= SESSION_STATE_TRANSPORT_DELETED)
- session_free_w_fifos (s);
+ session_program_cleanup (s);
return;
}
if (s->session_state == SESSION_STATE_TRANSPORT_CLOSED)
session_set_state (s, SESSION_STATE_CLOSED);
else if (s->session_state >= SESSION_STATE_TRANSPORT_DELETED)
- session_free_w_fifos (s);
+ session_program_cleanup (s);
return;
}
f->segment_index);
}
+void
+session_get_original_dst (transport_endpoint_t *i2o_src,
+ transport_endpoint_t *i2o_dst,
+ transport_proto_t transport_proto, u32 *original_dst,
+ u16 *original_dst_port)
+{
+ session_main_t *smm = vnet_get_session_main ();
+ ip_protocol_t proto =
+ (transport_proto == TRANSPORT_PROTO_TCP ? IPPROTO_TCP : IPPROTO_UDP);
+ if (!smm->original_dst_lookup || !i2o_dst->is_ip4)
+ return;
+ smm->original_dst_lookup (&i2o_src->ip.ip4, i2o_src->port, &i2o_dst->ip.ip4,
+ i2o_dst->port, proto, original_dst,
+ original_dst_port);
+}
+
/* *INDENT-OFF* */
static session_fifo_rx_fn *session_tx_fns[TRANSPORT_TX_N_FNS] = {
session_tx_fifo_peek_and_snd,
if (!sm->poll_main)
continue;
}
+ vlib_node_set_state (vm, session_input_node.index, mstate);
vlib_node_set_state (vm, session_queue_node.index, state);
}
smm->use_private_rx_mqs = 0;
smm->no_adaptive = 0;
smm->last_transport_proto_type = TRANSPORT_PROTO_HTTP;
+ smm->port_allocator_min_src_port = 1024;
+ smm->port_allocator_max_src_port = 65535;
return 0;
}
else if (unformat (input, "local-endpoints-table-buckets %d",
&smm->local_endpoints_table_buckets))
;
+ else if (unformat (input, "min-src-port %d", &tmp))
+ smm->port_allocator_min_src_port = tmp;
+ else if (unformat (input, "max-src-port %d", &tmp))
+ smm->port_allocator_max_src_port = tmp;
else if (unformat (input, "enable"))
smm->session_enable_asap = 1;
else if (unformat (input, "use-app-socket-api"))
smm->no_adaptive = 1;
else if (unformat (input, "use-dma"))
smm->dma_enabled = 1;
+ else if (unformat (input, "nat44-original-dst-enable"))
+ {
+ smm->original_dst_lookup = vlib_get_plugin_symbol (
+ "nat_plugin.so", "nat44_original_dst_lookup");
+ }
/*
* Deprecated but maintained for compatibility
*/
Code Review / vpp.git / blobdiff