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-rw-r--r--net/rxrpc/input.c1223
1 files changed, 371 insertions, 852 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 721d847ba92b..d0e20e946e48 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1,35 +1,19 @@
// SPDX-License-Identifier: GPL-2.0-or-later
-/* RxRPC packet reception
+/* Processing of received RxRPC packets
*
- * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2020 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/module.h>
-#include <linux/net.h>
-#include <linux/skbuff.h>
-#include <linux/errqueue.h>
-#include <linux/udp.h>
-#include <linux/in.h>
-#include <linux/in6.h>
-#include <linux/icmp.h>
-#include <linux/gfp.h>
-#include <net/sock.h>
-#include <net/af_rxrpc.h>
-#include <net/ip.h>
-#include <net/udp.h>
-#include <net/net_namespace.h>
#include "ar-internal.h"
static void rxrpc_proto_abort(const char *why,
struct rxrpc_call *call, rxrpc_seq_t seq)
{
- if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) {
- set_bit(RXRPC_CALL_EV_ABORT, &call->events);
- rxrpc_queue_call(call);
- }
+ if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG))
+ rxrpc_send_abort_packet(call);
}
/*
@@ -46,7 +30,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call,
bool resend = false;
summary->flight_size =
- (call->tx_top - call->tx_hard_ack) - summary->nr_acks;
+ (call->tx_top - call->acks_hard_ack) - summary->nr_acks;
if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) {
summary->retrans_timeo = true;
@@ -74,7 +58,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call,
switch (call->cong_mode) {
case RXRPC_CALL_SLOW_START:
- if (summary->nr_nacks > 0)
+ if (summary->saw_nacks)
goto packet_loss_detected;
if (summary->cumulative_acks > 0)
cwnd += 1;
@@ -85,7 +69,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call,
goto out;
case RXRPC_CALL_CONGEST_AVOIDANCE:
- if (summary->nr_nacks > 0)
+ if (summary->saw_nacks)
goto packet_loss_detected;
/* We analyse the number of packets that get ACK'd per RTT
@@ -104,7 +88,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call,
goto out;
case RXRPC_CALL_PACKET_LOSS:
- if (summary->nr_nacks == 0)
+ if (!summary->saw_nacks)
goto resume_normality;
if (summary->new_low_nack) {
@@ -142,7 +126,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call,
} else {
change = rxrpc_cong_progress;
cwnd = call->cong_ssthresh;
- if (summary->nr_nacks == 0)
+ if (!summary->saw_nacks)
goto resume_normality;
}
goto out;
@@ -164,13 +148,13 @@ resume_normality:
out:
cumulative_acks = 0;
out_no_clear_ca:
- if (cwnd >= RXRPC_RXTX_BUFF_SIZE - 1)
- cwnd = RXRPC_RXTX_BUFF_SIZE - 1;
+ if (cwnd >= RXRPC_TX_MAX_WINDOW)
+ cwnd = RXRPC_TX_MAX_WINDOW;
call->cong_cwnd = cwnd;
call->cong_cumul_acks = cumulative_acks;
trace_rxrpc_congest(call, summary, acked_serial, change);
- if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
- rxrpc_queue_call(call);
+ if (resend)
+ rxrpc_resend(call, skb);
return;
packet_loss_detected:
@@ -183,9 +167,8 @@ send_extra_data:
/* Send some previously unsent DATA if we have some to advance the ACK
* state.
*/
- if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] &
- RXRPC_TX_ANNO_LAST ||
- summary->nr_acks != call->tx_top - call->tx_hard_ack) {
+ if (test_bit(RXRPC_CALL_TX_LAST, &call->flags) ||
+ summary->nr_acks != call->tx_top - call->acks_hard_ack) {
call->cong_extra++;
wake_up(&call->waitq);
}
@@ -193,58 +176,71 @@ send_extra_data:
}
/*
+ * Degrade the congestion window if we haven't transmitted a packet for >1RTT.
+ */
+void rxrpc_congestion_degrade(struct rxrpc_call *call)
+{
+ ktime_t rtt, now;
+
+ if (call->cong_mode != RXRPC_CALL_SLOW_START &&
+ call->cong_mode != RXRPC_CALL_CONGEST_AVOIDANCE)
+ return;
+ if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
+ return;
+
+ rtt = ns_to_ktime(call->peer->srtt_us * (1000 / 8));
+ now = ktime_get_real();
+ if (!ktime_before(ktime_add(call->tx_last_sent, rtt), now))
+ return;
+
+ trace_rxrpc_reset_cwnd(call, now);
+ rxrpc_inc_stat(call->rxnet, stat_tx_data_cwnd_reset);
+ call->tx_last_sent = now;
+ call->cong_mode = RXRPC_CALL_SLOW_START;
+ call->cong_ssthresh = max_t(unsigned int, call->cong_ssthresh,
+ call->cong_cwnd * 3 / 4);
+ call->cong_cwnd = max_t(unsigned int, call->cong_cwnd / 2, RXRPC_MIN_CWND);
+}
+
+/*
* Apply a hard ACK by advancing the Tx window.
*/
static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to,
struct rxrpc_ack_summary *summary)
{
- struct sk_buff *skb, *list = NULL;
+ struct rxrpc_txbuf *txb;
bool rot_last = false;
- int ix;
- u8 annotation;
-
- if (call->acks_lowest_nak == call->tx_hard_ack) {
- call->acks_lowest_nak = to;
- } else if (before_eq(call->acks_lowest_nak, to)) {
- summary->new_low_nack = true;
- call->acks_lowest_nak = to;
- }
-
- spin_lock(&call->lock);
- while (before(call->tx_hard_ack, to)) {
- call->tx_hard_ack++;
- ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK;
- skb = call->rxtx_buffer[ix];
- annotation = call->rxtx_annotations[ix];
- rxrpc_see_skb(skb, rxrpc_skb_rotated);
- call->rxtx_buffer[ix] = NULL;
- call->rxtx_annotations[ix] = 0;
- skb->next = list;
- list = skb;
-
- if (annotation & RXRPC_TX_ANNO_LAST) {
+ list_for_each_entry_rcu(txb, &call->tx_buffer, call_link, false) {
+ if (before_eq(txb->seq, call->acks_hard_ack))
+ continue;
+ summary->nr_rot_new_acks++;
+ if (test_bit(RXRPC_TXBUF_LAST, &txb->flags)) {
set_bit(RXRPC_CALL_TX_LAST, &call->flags);
rot_last = true;
}
- if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK)
- summary->nr_rot_new_acks++;
+ if (txb->seq == to)
+ break;
}
- spin_unlock(&call->lock);
+ if (rot_last)
+ set_bit(RXRPC_CALL_TX_ALL_ACKED, &call->flags);
- trace_rxrpc_transmit(call, (rot_last ?
- rxrpc_transmit_rotate_last :
- rxrpc_transmit_rotate));
- wake_up(&call->waitq);
+ _enter("%x,%x,%x,%d", to, call->acks_hard_ack, call->tx_top, rot_last);
- while (list) {
- skb = list;
- list = skb->next;
- skb_mark_not_on_list(skb);
- rxrpc_free_skb(skb, rxrpc_skb_freed);
+ if (call->acks_lowest_nak == call->acks_hard_ack) {
+ call->acks_lowest_nak = to;
+ } else if (after(to, call->acks_lowest_nak)) {
+ summary->new_low_nack = true;
+ call->acks_lowest_nak = to;
}
+ smp_store_release(&call->acks_hard_ack, to);
+
+ trace_rxrpc_txqueue(call, (rot_last ?
+ rxrpc_txqueue_rotate_last :
+ rxrpc_txqueue_rotate));
+ wake_up(&call->waitq);
return rot_last;
}
@@ -284,9 +280,9 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
write_unlock(&call->state_lock);
if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
- trace_rxrpc_transmit(call, rxrpc_transmit_await_reply);
+ trace_rxrpc_txqueue(call, rxrpc_txqueue_await_reply);
else
- trace_rxrpc_transmit(call, rxrpc_transmit_end);
+ trace_rxrpc_txqueue(call, rxrpc_txqueue_end);
_leave(" = ok");
return true;
@@ -307,13 +303,10 @@ static bool rxrpc_receiving_reply(struct rxrpc_call *call)
rxrpc_seq_t top = READ_ONCE(call->tx_top);
if (call->ackr_reason) {
- spin_lock_bh(&call->lock);
- call->ackr_reason = 0;
- spin_unlock_bh(&call->lock);
now = jiffies;
timo = now + MAX_JIFFY_OFFSET;
WRITE_ONCE(call->resend_at, timo);
- WRITE_ONCE(call->ack_at, timo);
+ WRITE_ONCE(call->delay_ack_at, timo);
trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
}
@@ -323,85 +316,231 @@ static bool rxrpc_receiving_reply(struct rxrpc_call *call)
return false;
}
}
- if (!rxrpc_end_tx_phase(call, true, "ETD"))
- return false;
- call->tx_phase = false;
- return true;
+ return rxrpc_end_tx_phase(call, true, "ETD");
+}
+
+static void rxrpc_input_update_ack_window(struct rxrpc_call *call,
+ rxrpc_seq_t window, rxrpc_seq_t wtop)
+{
+ atomic64_set_release(&call->ackr_window, ((u64)wtop) << 32 | window);
}
/*
- * Scan a data packet to validate its structure and to work out how many
- * subpackets it contains.
- *
- * A jumbo packet is a collection of consecutive packets glued together with
- * little headers between that indicate how to change the initial header for
- * each subpacket.
- *
- * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but
- * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any
- * size.
+ * Push a DATA packet onto the Rx queue.
*/
-static bool rxrpc_validate_data(struct sk_buff *skb)
+static void rxrpc_input_queue_data(struct rxrpc_call *call, struct sk_buff *skb,
+ rxrpc_seq_t window, rxrpc_seq_t wtop,
+ enum rxrpc_receive_trace why)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- unsigned int offset = sizeof(struct rxrpc_wire_header);
- unsigned int len = skb->len;
- u8 flags = sp->hdr.flags;
+ bool last = sp->hdr.flags & RXRPC_LAST_PACKET;
- for (;;) {
- if (flags & RXRPC_REQUEST_ACK)
- __set_bit(sp->nr_subpackets, sp->rx_req_ack);
- sp->nr_subpackets++;
+ __skb_queue_tail(&call->recvmsg_queue, skb);
+ rxrpc_input_update_ack_window(call, window, wtop);
- if (!(flags & RXRPC_JUMBO_PACKET))
- break;
+ trace_rxrpc_receive(call, last ? why + 1 : why, sp->hdr.serial, sp->hdr.seq);
+}
- if (len - offset < RXRPC_JUMBO_SUBPKTLEN)
- goto protocol_error;
- if (flags & RXRPC_LAST_PACKET)
- goto protocol_error;
- offset += RXRPC_JUMBO_DATALEN;
- if (skb_copy_bits(skb, offset, &flags, 1) < 0)
- goto protocol_error;
- offset += sizeof(struct rxrpc_jumbo_header);
+/*
+ * Process a DATA packet.
+ */
+static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb,
+ bool *_notify)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct sk_buff *oos;
+ rxrpc_serial_t serial = sp->hdr.serial;
+ u64 win = atomic64_read(&call->ackr_window);
+ rxrpc_seq_t window = lower_32_bits(win);
+ rxrpc_seq_t wtop = upper_32_bits(win);
+ rxrpc_seq_t wlimit = window + call->rx_winsize - 1;
+ rxrpc_seq_t seq = sp->hdr.seq;
+ bool last = sp->hdr.flags & RXRPC_LAST_PACKET;
+ int ack_reason = -1;
+
+ rxrpc_inc_stat(call->rxnet, stat_rx_data);
+ if (sp->hdr.flags & RXRPC_REQUEST_ACK)
+ rxrpc_inc_stat(call->rxnet, stat_rx_data_reqack);
+ if (sp->hdr.flags & RXRPC_JUMBO_PACKET)
+ rxrpc_inc_stat(call->rxnet, stat_rx_data_jumbo);
+
+ if (last) {
+ if (test_and_set_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
+ seq + 1 != wtop) {
+ rxrpc_proto_abort("LSN", call, seq);
+ return;
+ }
+ } else {
+ if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
+ after_eq(seq, wtop)) {
+ pr_warn("Packet beyond last: c=%x q=%x window=%x-%x wlimit=%x\n",
+ call->debug_id, seq, window, wtop, wlimit);
+ rxrpc_proto_abort("LSA", call, seq);
+ return;
+ }
}
- if (flags & RXRPC_LAST_PACKET)
- sp->rx_flags |= RXRPC_SKB_INCL_LAST;
- return true;
+ if (after(seq, call->rx_highest_seq))
+ call->rx_highest_seq = seq;
-protocol_error:
- return false;
+ trace_rxrpc_rx_data(call->debug_id, seq, serial, sp->hdr.flags);
+
+ if (before(seq, window)) {
+ ack_reason = RXRPC_ACK_DUPLICATE;
+ goto send_ack;
+ }
+ if (after(seq, wlimit)) {
+ ack_reason = RXRPC_ACK_EXCEEDS_WINDOW;
+ goto send_ack;
+ }
+
+ /* Queue the packet. */
+ if (seq == window) {
+ rxrpc_seq_t reset_from;
+ bool reset_sack = false;
+
+ if (sp->hdr.flags & RXRPC_REQUEST_ACK)
+ ack_reason = RXRPC_ACK_REQUESTED;
+ /* Send an immediate ACK if we fill in a hole */
+ else if (!skb_queue_empty(&call->rx_oos_queue))
+ ack_reason = RXRPC_ACK_DELAY;
+ else
+ atomic_inc_return(&call->ackr_nr_unacked);
+
+ window++;
+ if (after(window, wtop))
+ wtop = window;
+
+ rxrpc_get_skb(skb, rxrpc_skb_get_to_recvmsg);
+
+ spin_lock(&call->recvmsg_queue.lock);
+ rxrpc_input_queue_data(call, skb, window, wtop, rxrpc_receive_queue);
+ *_notify = true;
+
+ while ((oos = skb_peek(&call->rx_oos_queue))) {
+ struct rxrpc_skb_priv *osp = rxrpc_skb(oos);
+
+ if (after(osp->hdr.seq, window))
+ break;
+
+ __skb_unlink(oos, &call->rx_oos_queue);
+ last = osp->hdr.flags & RXRPC_LAST_PACKET;
+ seq = osp->hdr.seq;
+ if (!reset_sack) {
+ reset_from = seq;
+ reset_sack = true;
+ }
+
+ window++;
+ rxrpc_input_queue_data(call, oos, window, wtop,
+ rxrpc_receive_queue_oos);
+ }
+
+ spin_unlock(&call->recvmsg_queue.lock);
+
+ if (reset_sack) {
+ do {
+ call->ackr_sack_table[reset_from % RXRPC_SACK_SIZE] = 0;
+ } while (reset_from++, before(reset_from, window));
+ }
+ } else {
+ bool keep = false;
+
+ ack_reason = RXRPC_ACK_OUT_OF_SEQUENCE;
+
+ if (!call->ackr_sack_table[seq % RXRPC_SACK_SIZE]) {
+ call->ackr_sack_table[seq % RXRPC_SACK_SIZE] = 1;
+ keep = 1;
+ }
+
+ if (after(seq + 1, wtop)) {
+ wtop = seq + 1;
+ rxrpc_input_update_ack_window(call, window, wtop);
+ }
+
+ if (!keep) {
+ ack_reason = RXRPC_ACK_DUPLICATE;
+ goto send_ack;
+ }
+
+ skb_queue_walk(&call->rx_oos_queue, oos) {
+ struct rxrpc_skb_priv *osp = rxrpc_skb(oos);
+
+ if (after(osp->hdr.seq, seq)) {
+ rxrpc_get_skb(skb, rxrpc_skb_get_to_recvmsg_oos);
+ __skb_queue_before(&call->rx_oos_queue, oos, skb);
+ goto oos_queued;
+ }
+ }
+
+ rxrpc_get_skb(skb, rxrpc_skb_get_to_recvmsg_oos);
+ __skb_queue_tail(&call->rx_oos_queue, skb);
+ oos_queued:
+ trace_rxrpc_receive(call, last ? rxrpc_receive_oos_last : rxrpc_receive_oos,
+ sp->hdr.serial, sp->hdr.seq);
+ }
+
+send_ack:
+ if (ack_reason >= 0)
+ rxrpc_send_ACK(call, ack_reason, serial,
+ rxrpc_propose_ack_input_data);
+ else
+ rxrpc_propose_delay_ACK(call, serial,
+ rxrpc_propose_ack_input_data);
}
/*
- * Handle reception of a duplicate packet.
- *
- * We have to take care to avoid an attack here whereby we're given a series of
- * jumbograms, each with a sequence number one before the preceding one and
- * filled up to maximum UDP size. If they never send us the first packet in
- * the sequence, they can cause us to have to hold on to around 2MiB of kernel
- * space until the call times out.
- *
- * We limit the space usage by only accepting three duplicate jumbo packets per
- * call. After that, we tell the other side we're no longer accepting jumbos
- * (that information is encoded in the ACK packet).
+ * Split a jumbo packet and file the bits separately.
*/
-static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
- bool is_jumbo, bool *_jumbo_bad)
+static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb)
{
- /* Discard normal packets that are duplicates. */
- if (is_jumbo)
- return;
+ struct rxrpc_jumbo_header jhdr;
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb), *jsp;
+ struct sk_buff *jskb;
+ unsigned int offset = sizeof(struct rxrpc_wire_header);
+ unsigned int len = skb->len - offset;
+ bool notify = false;
- /* Skip jumbo subpackets that are duplicates. When we've had three or
- * more partially duplicate jumbo packets, we refuse to take any more
- * jumbos for this call.
- */
- if (!*_jumbo_bad) {
- call->nr_jumbo_bad++;
- *_jumbo_bad = true;
+ while (sp->hdr.flags & RXRPC_JUMBO_PACKET) {
+ if (len < RXRPC_JUMBO_SUBPKTLEN)
+ goto protocol_error;
+ if (sp->hdr.flags & RXRPC_LAST_PACKET)
+ goto protocol_error;
+ if (skb_copy_bits(skb, offset + RXRPC_JUMBO_DATALEN,
+ &jhdr, sizeof(jhdr)) < 0)
+ goto protocol_error;
+
+ jskb = skb_clone(skb, GFP_NOFS);
+ if (!jskb) {
+ kdebug("couldn't clone");
+ return false;
+ }
+ rxrpc_new_skb(jskb, rxrpc_skb_new_jumbo_subpacket);
+ jsp = rxrpc_skb(jskb);
+ jsp->offset = offset;
+ jsp->len = RXRPC_JUMBO_DATALEN;
+ rxrpc_input_data_one(call, jskb, &notify);
+ rxrpc_free_skb(jskb, rxrpc_skb_put_jumbo_subpacket);
+
+ sp->hdr.flags = jhdr.flags;
+ sp->hdr._rsvd = ntohs(jhdr._rsvd);
+ sp->hdr.seq++;
+ sp->hdr.serial++;
+ offset += RXRPC_JUMBO_SUBPKTLEN;
+ len -= RXRPC_JUMBO_SUBPKTLEN;
}
+
+ sp->offset = offset;
+ sp->len = len;
+ rxrpc_input_data_one(call, skb, &notify);
+ if (notify) {
+ trace_rxrpc_notify_socket(call->debug_id, sp->hdr.serial);
+ rxrpc_notify_socket(call);
+ }
+ return true;
+
+protocol_error:
+ return false;
}
/*
@@ -412,23 +551,16 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
enum rxrpc_call_state state;
- unsigned int j, nr_subpackets, nr_unacked = 0;
- rxrpc_serial_t serial = sp->hdr.serial, ack_serial = serial;
- rxrpc_seq_t seq0 = sp->hdr.seq, hard_ack;
- bool immediate_ack = false, jumbo_bad = false;
- u8 ack = 0;
-
- _enter("{%u,%u},{%u,%u}",
- call->rx_hard_ack, call->rx_top, skb->len, seq0);
+ rxrpc_serial_t serial = sp->hdr.serial;
+ rxrpc_seq_t seq0 = sp->hdr.seq;
- _proto("Rx DATA %%%u { #%u f=%02x n=%u }",
- sp->hdr.serial, seq0, sp->hdr.flags, sp->nr_subpackets);
+ _enter("{%llx,%x},{%u,%x}",
+ atomic64_read(&call->ackr_window), call->rx_highest_seq,
+ skb->len, seq0);
state = READ_ONCE(call->state);
- if (state >= RXRPC_CALL_COMPLETE) {
- rxrpc_free_skb(skb, rxrpc_skb_freed);
+ if (state >= RXRPC_CALL_COMPLETE)
return;
- }
if (state == RXRPC_CALL_SERVER_RECV_REQUEST) {
unsigned long timo = READ_ONCE(call->next_req_timo);
@@ -443,176 +575,23 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
}
}
- spin_lock(&call->input_lock);
-
/* Received data implicitly ACKs all of the request packets we sent
* when we're acting as a client.
*/
if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST ||
state == RXRPC_CALL_CLIENT_AWAIT_REPLY) &&
!rxrpc_receiving_reply(call))
- goto unlock;
-
- hard_ack = READ_ONCE(call->rx_hard_ack);
-
- nr_subpackets = sp->nr_subpackets;
- if (nr_subpackets > 1) {
- if (call->nr_jumbo_bad > 3) {
- ack = RXRPC_ACK_NOSPACE;
- ack_serial = serial;
- goto ack;
- }
- }
-
- for (j = 0; j < nr_subpackets; j++) {
- rxrpc_serial_t serial = sp->hdr.serial + j;
- rxrpc_seq_t seq = seq0 + j;
- unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK;
- bool terminal = (j == nr_subpackets - 1);
- bool last = terminal && (sp->rx_flags & RXRPC_SKB_INCL_LAST);
- u8 flags, annotation = j;
-
- _proto("Rx DATA+%u %%%u { #%x t=%u l=%u }",
- j, serial, seq, terminal, last);
-
- if (last) {
- if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
- seq != call->rx_top) {
- rxrpc_proto_abort("LSN", call, seq);
- goto unlock;
- }
- } else {
- if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
- after_eq(seq, call->rx_top)) {
- rxrpc_proto_abort("LSA", call, seq);
- goto unlock;
- }
- }
-
- flags = 0;
- if (last)
- flags |= RXRPC_LAST_PACKET;
- if (!terminal)
- flags |= RXRPC_JUMBO_PACKET;
- if (test_bit(j, sp->rx_req_ack))
- flags |= RXRPC_REQUEST_ACK;
- trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation);
-
- if (before_eq(seq, hard_ack)) {
- ack = RXRPC_ACK_DUPLICATE;
- ack_serial = serial;
- continue;
- }
-
- if (call->rxtx_buffer[ix]) {
- rxrpc_input_dup_data(call, seq, nr_subpackets > 1,
- &jumbo_bad);
- if (ack != RXRPC_ACK_DUPLICATE) {
- ack = RXRPC_ACK_DUPLICATE;
- ack_serial = serial;
- }
- immediate_ack = true;
- continue;
- }
-
- if (after(seq, hard_ack + call->rx_winsize)) {
- ack = RXRPC_ACK_EXCEEDS_WINDOW;
- ack_serial = serial;
- if (flags & RXRPC_JUMBO_PACKET) {
- if (!jumbo_bad) {
- call->nr_jumbo_bad++;
- jumbo_bad = true;
- }
- }
-
- goto ack;
- }
-
- if (flags & RXRPC_REQUEST_ACK && !ack) {
- ack = RXRPC_ACK_REQUESTED;
- ack_serial = serial;
- }
-
- if (after(seq0, call->ackr_highest_seq))
- call->ackr_highest_seq = seq0;
-
- /* Queue the packet. We use a couple of memory barriers here as need
- * to make sure that rx_top is perceived to be set after the buffer
- * pointer and that the buffer pointer is set after the annotation and
- * the skb data.
- *
- * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window()
- * and also rxrpc_fill_out_ack().
- */
- if (!terminal)
- rxrpc_get_skb(skb, rxrpc_skb_got);
- call->rxtx_annotations[ix] = annotation;
- smp_wmb();
- call->rxtx_buffer[ix] = skb;
- if (after(seq, call->rx_top)) {
- smp_store_release(&call->rx_top, seq);
- } else if (before(seq, call->rx_top)) {
- /* Send an immediate ACK if we fill in a hole */
- if (!ack) {
- ack = RXRPC_ACK_DELAY;
- ack_serial = serial;
- }
- immediate_ack = true;
- }
-
- if (terminal) {
- /* From this point on, we're not allowed to touch the
- * packet any longer as its ref now belongs to the Rx
- * ring.
- */
- skb = NULL;
- sp = NULL;
- }
+ goto out_notify;
- nr_unacked++;
-
- if (last) {
- set_bit(RXRPC_CALL_RX_LAST, &call->flags);
- if (!ack) {
- ack = RXRPC_ACK_DELAY;
- ack_serial = serial;
- }
- trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
- } else {
- trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
- }
-
- if (after_eq(seq, call->rx_expect_next)) {
- if (after(seq, call->rx_expect_next)) {
- _net("OOS %u > %u", seq, call->rx_expect_next);
- ack = RXRPC_ACK_OUT_OF_SEQUENCE;
- ack_serial = serial;
- }
- call->rx_expect_next = seq + 1;
- }
- if (!ack)
- ack_serial = serial;
+ if (!rxrpc_input_split_jumbo(call, skb)) {
+ rxrpc_proto_abort("VLD", call, sp->hdr.seq);
+ goto out_notify;
}
+ skb = NULL;
-ack:
- if (atomic_add_return(nr_unacked, &call->ackr_nr_unacked) > 2 && !ack)
- ack = RXRPC_ACK_IDLE;
-
- if (ack)
- rxrpc_propose_ACK(call, ack, ack_serial,
- immediate_ack, true,
- rxrpc_propose_ack_input_data);
- else
- rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial,
- false, true,
- rxrpc_propose_ack_input_data);
-
+out_notify:
trace_rxrpc_notify_socket(call->debug_id, serial);
rxrpc_notify_socket(call);
-
-unlock:
- spin_unlock(&call->input_lock);
- rxrpc_free_skb(skb, rxrpc_skb_freed);
_leave(" [queued]");
}
@@ -671,55 +650,6 @@ static void rxrpc_complete_rtt_probe(struct rxrpc_call *call,
}
/*
- * Process the response to a ping that we sent to find out if we lost an ACK.
- *
- * If we got back a ping response that indicates a lower tx_top than what we
- * had at the time of the ping transmission, we adjudge all the DATA packets
- * sent between the response tx_top and the ping-time tx_top to have been lost.
- */
-static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call)
-{
- rxrpc_seq_t top, bottom, seq;
- bool resend = false;
-
- spin_lock_bh(&call->lock);
-
- bottom = call->tx_hard_ack + 1;
- top = call->acks_lost_top;
- if (before(bottom, top)) {
- for (seq = bottom; before_eq(seq, top); seq++) {
- int ix = seq & RXRPC_RXTX_BUFF_MASK;
- u8 annotation = call->rxtx_annotations[ix];
- u8 anno_type = annotation & RXRPC_TX_ANNO_MASK;
-
- if (anno_type != RXRPC_TX_ANNO_UNACK)
- continue;
- annotation &= ~RXRPC_TX_ANNO_MASK;
- annotation |= RXRPC_TX_ANNO_RETRANS;
- call->rxtx_annotations[ix] = annotation;
- resend = true;
- }
- }
-
- spin_unlock_bh(&call->lock);
-
- if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
- rxrpc_queue_call(call);
-}
-
-/*
- * Process a ping response.
- */
-static void rxrpc_input_ping_response(struct rxrpc_call *call,
- ktime_t resp_time,
- rxrpc_serial_t acked_serial,
- rxrpc_serial_t ack_serial)
-{
- if (acked_serial == call->acks_lost_ping)
- rxrpc_input_check_for_lost_ack(call);
-}
-
-/*
* Process the extra information that may be appended to an ACK packet
*/
static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
@@ -731,13 +661,8 @@ static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
bool wake = false;
u32 rwind = ntohl(ackinfo->rwind);
- _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
- sp->hdr.serial,
- ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU),
- rwind, ntohl(ackinfo->jumbo_max));
-
- if (rwind > RXRPC_RXTX_BUFF_SIZE - 1)
- rwind = RXRPC_RXTX_BUFF_SIZE - 1;
+ if (rwind > RXRPC_TX_MAX_WINDOW)
+ rwind = RXRPC_TX_MAX_WINDOW;
if (call->tx_winsize != rwind) {
if (rwind > call->tx_winsize)
wake = true;
@@ -752,11 +677,10 @@ static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
peer = call->peer;
if (mtu < peer->maxdata) {
- spin_lock_bh(&peer->lock);
+ spin_lock(&peer->lock);
peer->maxdata = mtu;
peer->mtu = mtu + peer->hdrsize;
- spin_unlock_bh(&peer->lock);
- _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
+ spin_unlock(&peer->lock);
}
if (wake)
@@ -776,40 +700,19 @@ static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
rxrpc_seq_t seq, int nr_acks,
struct rxrpc_ack_summary *summary)
{
- int ix;
- u8 annotation, anno_type;
-
- for (; nr_acks > 0; nr_acks--, seq++) {
- ix = seq & RXRPC_RXTX_BUFF_MASK;
- annotation = call->rxtx_annotations[ix];
- anno_type = annotation & RXRPC_TX_ANNO_MASK;
- annotation &= ~RXRPC_TX_ANNO_MASK;
- switch (*acks++) {
- case RXRPC_ACK_TYPE_ACK:
+ unsigned int i;
+
+ for (i = 0; i < nr_acks; i++) {
+ if (acks[i] == RXRPC_ACK_TYPE_ACK) {
summary->nr_acks++;
- if (anno_type == RXRPC_TX_ANNO_ACK)
- continue;
summary->nr_new_acks++;
- call->rxtx_annotations[ix] =
- RXRPC_TX_ANNO_ACK | annotation;
- break;
- case RXRPC_ACK_TYPE_NACK:
- if (!summary->nr_nacks &&
- call->acks_lowest_nak != seq) {
- call->acks_lowest_nak = seq;
+ } else {
+ if (!summary->saw_nacks &&
+ call->acks_lowest_nak != seq + i) {
+ call->acks_lowest_nak = seq + i;
summary->new_low_nack = true;
}
- summary->nr_nacks++;
- if (anno_type == RXRPC_TX_ANNO_NAK)
- continue;
- summary->nr_new_nacks++;
- if (anno_type == RXRPC_TX_ANNO_RETRANS)
- continue;
- call->rxtx_annotations[ix] =
- RXRPC_TX_ANNO_NAK | annotation;
- break;
- default:
- return rxrpc_proto_abort("SFT", call, 0);
+ summary->saw_nacks = true;
}
}
}
@@ -851,12 +754,9 @@ static bool rxrpc_is_ack_valid(struct rxrpc_call *call,
static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_ack_summary summary = { 0 };
+ struct rxrpc_ackpacket ack;
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- union {
- struct rxrpc_ackpacket ack;
- struct rxrpc_ackinfo info;
- u8 acks[RXRPC_MAXACKS];
- } buf;
+ struct rxrpc_ackinfo info;
rxrpc_serial_t ack_serial, acked_serial;
rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt;
int nr_acks, offset, ioffset;
@@ -864,29 +764,26 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
_enter("");
offset = sizeof(struct rxrpc_wire_header);
- if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) {
- _debug("extraction failure");
+ if (skb_copy_bits(skb, offset, &ack, sizeof(ack)) < 0)
return rxrpc_proto_abort("XAK", call, 0);
- }
- offset += sizeof(buf.ack);
+ offset += sizeof(ack);
ack_serial = sp->hdr.serial;
- acked_serial = ntohl(buf.ack.serial);
- first_soft_ack = ntohl(buf.ack.firstPacket);
- prev_pkt = ntohl(buf.ack.previousPacket);
+ acked_serial = ntohl(ack.serial);
+ first_soft_ack = ntohl(ack.firstPacket);
+ prev_pkt = ntohl(ack.previousPacket);
hard_ack = first_soft_ack - 1;
- nr_acks = buf.ack.nAcks;
- summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?
- buf.ack.reason : RXRPC_ACK__INVALID);
+ nr_acks = ack.nAcks;
+ summary.ack_reason = (ack.reason < RXRPC_ACK__INVALID ?
+ ack.reason : RXRPC_ACK__INVALID);
trace_rxrpc_rx_ack(call, ack_serial, acked_serial,
first_soft_ack, prev_pkt,
summary.ack_reason, nr_acks);
+ rxrpc_inc_stat(call->rxnet, stat_rx_acks[ack.reason]);
- switch (buf.ack.reason) {
+ switch (ack.reason) {
case RXRPC_ACK_PING_RESPONSE:
- rxrpc_input_ping_response(call, skb->tstamp, acked_serial,
- ack_serial);
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_ping_response);
break;
@@ -901,22 +798,19 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
break;
}
- if (buf.ack.reason == RXRPC_ACK_PING) {
- _proto("Rx ACK %%%u PING Request", ack_serial);
- rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
- ack_serial, true, true,
- rxrpc_propose_ack_respond_to_ping);
+ if (ack.reason == RXRPC_ACK_PING) {
+ rxrpc_send_ACK(call, RXRPC_ACK_PING_RESPONSE, ack_serial,
+ rxrpc_propose_ack_respond_to_ping);
} else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
- rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
- ack_serial, true, true,
- rxrpc_propose_ack_respond_to_ack);
+ rxrpc_send_ACK(call, RXRPC_ACK_REQUESTED, ack_serial,
+ rxrpc_propose_ack_respond_to_ack);
}
/* If we get an EXCEEDS_WINDOW ACK from the server, it probably
* indicates that the client address changed due to NAT. The server
* lost the call because it switched to a different peer.
*/
- if (unlikely(buf.ack.reason == RXRPC_ACK_EXCEEDS_WINDOW) &&
+ if (unlikely(ack.reason == RXRPC_ACK_EXCEEDS_WINDOW) &&
first_soft_ack == 1 &&
prev_pkt == 0 &&
rxrpc_is_client_call(call)) {
@@ -929,10 +823,10 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
* indicate a change of address. However, we can retransmit the call
* if we still have it buffered to the beginning.
*/
- if (unlikely(buf.ack.reason == RXRPC_ACK_OUT_OF_SEQUENCE) &&
+ if (unlikely(ack.reason == RXRPC_ACK_OUT_OF_SEQUENCE) &&
first_soft_ack == 1 &&
prev_pkt == 0 &&
- call->tx_hard_ack == 0 &&
+ call->acks_hard_ack == 0 &&
rxrpc_is_client_call(call)) {
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
0, -ENETRESET);
@@ -947,34 +841,34 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
return;
}
- buf.info.rxMTU = 0;
+ info.rxMTU = 0;
ioffset = offset + nr_acks + 3;
- if (skb->len >= ioffset + sizeof(buf.info) &&
- skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0)
+ if (skb->len >= ioffset + sizeof(info) &&
+ skb_copy_bits(skb, ioffset, &info, sizeof(info)) < 0)
return rxrpc_proto_abort("XAI", call, 0);
- spin_lock(&call->input_lock);
+ if (nr_acks > 0)
+ skb_condense(skb);
- /* Discard any out-of-order or duplicate ACKs (inside lock). */
- if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) {
- trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial,
- first_soft_ack, call->acks_first_seq,
- prev_pkt, call->acks_prev_seq);
- goto out;
- }
call->acks_latest_ts = skb->tstamp;
-
call->acks_first_seq = first_soft_ack;
call->acks_prev_seq = prev_pkt;
+ switch (ack.reason) {
+ case RXRPC_ACK_PING:
+ break;
+ default:
+ if (after(acked_serial, call->acks_highest_serial))
+ call->acks_highest_serial = acked_serial;
+ break;
+ }
+
/* Parse rwind and mtu sizes if provided. */
- if (buf.info.rxMTU)
- rxrpc_input_ackinfo(call, skb, &buf.info);
+ if (info.rxMTU)
+ rxrpc_input_ackinfo(call, skb, &info);
- if (first_soft_ack == 0) {
- rxrpc_proto_abort("AK0", call, 0);
- goto out;
- }
+ if (first_soft_ack == 0)
+ return rxrpc_proto_abort("AK0", call, 0);
/* Ignore ACKs unless we are or have just been transmitting. */
switch (READ_ONCE(call->state)) {
@@ -984,46 +878,36 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
case RXRPC_CALL_SERVER_AWAIT_ACK:
break;
default:
- goto out;
+ return;
}
- if (before(hard_ack, call->tx_hard_ack) ||
- after(hard_ack, call->tx_top)) {
- rxrpc_proto_abort("AKW", call, 0);
- goto out;
- }
- if (nr_acks > call->tx_top - hard_ack) {
- rxrpc_proto_abort("AKN", call, 0);
- goto out;
- }
+ if (before(hard_ack, call->acks_hard_ack) ||
+ after(hard_ack, call->tx_top))
+ return rxrpc_proto_abort("AKW", call, 0);
+ if (nr_acks > call->tx_top - hard_ack)
+ return rxrpc_proto_abort("AKN", call, 0);
- if (after(hard_ack, call->tx_hard_ack)) {
+ if (after(hard_ack, call->acks_hard_ack)) {
if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) {
rxrpc_end_tx_phase(call, false, "ETA");
- goto out;
+ return;
}
}
if (nr_acks > 0) {
- if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) {
- rxrpc_proto_abort("XSA", call, 0);
- goto out;
- }
- rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks,
- &summary);
+ if (offset > (int)skb->len - nr_acks)
+ return rxrpc_proto_abort("XSA", call, 0);
+ rxrpc_input_soft_acks(call, skb->data + offset, first_soft_ack,
+ nr_acks, &summary);
}
- if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] &
- RXRPC_TX_ANNO_LAST &&
+ if (test_bit(RXRPC_CALL_TX_LAST, &call->flags) &&
summary.nr_acks == call->tx_top - hard_ack &&
rxrpc_is_client_call(call))
- rxrpc_propose_ACK(call, RXRPC_ACK_PING, ack_serial,
- false, true,
- rxrpc_propose_ack_ping_for_lost_reply);
+ rxrpc_propose_ping(call, ack_serial,
+ rxrpc_propose_ack_ping_for_lost_reply);
rxrpc_congestion_management(call, skb, &summary, acked_serial);
-out:
- spin_unlock(&call->input_lock);
}
/*
@@ -1032,16 +916,9 @@ out:
static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_ack_summary summary = { 0 };
- struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
-
- _proto("Rx ACKALL %%%u", sp->hdr.serial);
-
- spin_lock(&call->input_lock);
if (rxrpc_rotate_tx_window(call, call->tx_top, &summary))
rxrpc_end_tx_phase(call, false, "ETL");
-
- spin_unlock(&call->input_lock);
}
/*
@@ -1050,35 +927,30 @@ static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb)
static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
- __be32 wtmp;
- u32 abort_code = RX_CALL_DEAD;
-
- _enter("");
-
- if (skb->len >= 4 &&
- skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
- &wtmp, sizeof(wtmp)) >= 0)
- abort_code = ntohl(wtmp);
-
- trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code);
- _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
+ trace_rxrpc_rx_abort(call, sp->hdr.serial, skb->priority);
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
- abort_code, -ECONNABORTED);
+ skb->priority, -ECONNABORTED);
}
/*
* Process an incoming call packet.
*/
-static void rxrpc_input_call_packet(struct rxrpc_call *call,
- struct sk_buff *skb)
+void rxrpc_input_call_packet(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
unsigned long timo;
_enter("%p,%p", call, skb);
+ if (sp->hdr.serviceId != call->dest_srx.srx_service)
+ call->dest_srx.srx_service = sp->hdr.serviceId;
+ if ((int)sp->hdr.serial - (int)call->rx_serial > 0)
+ call->rx_serial = sp->hdr.serial;
+ if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags))
+ set_bit(RXRPC_CALL_RX_HEARD, &call->flags);
+
timo = READ_ONCE(call->next_rx_timo);
if (timo) {
unsigned long now = jiffies, expect_rx_by;
@@ -1092,15 +964,13 @@ static void rxrpc_input_call_packet(struct rxrpc_call *call,
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_DATA:
rxrpc_input_data(call, skb);
- goto no_free;
+ break;
case RXRPC_PACKET_TYPE_ACK:
rxrpc_input_ack(call, skb);
break;
case RXRPC_PACKET_TYPE_BUSY:
- _proto("Rx BUSY %%%u", sp->hdr.serial);
-
/* Just ignore BUSY packets from the server; the retry and
* lifespan timers will take care of business. BUSY packets
* from the client don't make sense.
@@ -1118,10 +988,6 @@ static void rxrpc_input_call_packet(struct rxrpc_call *call,
default:
break;
}
-
- rxrpc_free_skb(skb, rxrpc_skb_freed);
-no_free:
- _leave("");
}
/*
@@ -1130,10 +996,10 @@ no_free:
*
* TODO: If callNumber > call_id + 1, renegotiate security.
*/
-static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx,
- struct rxrpc_connection *conn,
- struct rxrpc_call *call)
+void rxrpc_implicit_end_call(struct rxrpc_call *call, struct sk_buff *skb)
{
+ struct rxrpc_connection *conn = call->conn;
+
switch (READ_ONCE(call->state)) {
case RXRPC_CALL_SERVER_AWAIT_ACK:
rxrpc_call_completed(call);
@@ -1141,362 +1007,15 @@ static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx,
case RXRPC_CALL_COMPLETE:
break;
default:
- if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) {
- set_bit(RXRPC_CALL_EV_ABORT, &call->events);
- rxrpc_queue_call(call);
- }
+ if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN))
+ rxrpc_send_abort_packet(call);
trace_rxrpc_improper_term(call);
break;
}
- spin_lock(&rx->incoming_lock);
- __rxrpc_disconnect_call(conn, call);
- spin_unlock(&rx->incoming_lock);
-}
-
-/*
- * post connection-level events to the connection
- * - this includes challenges, responses, some aborts and call terminal packet
- * retransmission.
- */
-static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
- struct sk_buff *skb)
-{
- _enter("%p,%p", conn, skb);
-
- skb_queue_tail(&conn->rx_queue, skb);
- rxrpc_queue_conn(conn);
-}
-
-/*
- * post endpoint-level events to the local endpoint
- * - this includes debug and version messages
- */
-static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
- struct sk_buff *skb)
-{
- _enter("%p,%p", local, skb);
-
- if (rxrpc_get_local_maybe(local)) {
- skb_queue_tail(&local->event_queue, skb);
- rxrpc_queue_local(local);
- } else {
- rxrpc_free_skb(skb, rxrpc_skb_freed);
- }
-}
-
-/*
- * put a packet up for transport-level abort
- */
-static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
-{
- if (rxrpc_get_local_maybe(local)) {
- skb_queue_tail(&local->reject_queue, skb);
- rxrpc_queue_local(local);
- } else {
- rxrpc_free_skb(skb, rxrpc_skb_freed);
- }
-}
+ rxrpc_input_call_event(call, skb);
-/*
- * Extract the wire header from a packet and translate the byte order.
- */
-static noinline
-int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
-{
- struct rxrpc_wire_header whdr;
-
- /* dig out the RxRPC connection details */
- if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) {
- trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
- tracepoint_string("bad_hdr"));
- return -EBADMSG;
- }
-
- memset(sp, 0, sizeof(*sp));
- sp->hdr.epoch = ntohl(whdr.epoch);
- sp->hdr.cid = ntohl(whdr.cid);
- sp->hdr.callNumber = ntohl(whdr.callNumber);
- sp->hdr.seq = ntohl(whdr.seq);
- sp->hdr.serial = ntohl(whdr.serial);
- sp->hdr.flags = whdr.flags;
- sp->hdr.type = whdr.type;
- sp->hdr.userStatus = whdr.userStatus;
- sp->hdr.securityIndex = whdr.securityIndex;
- sp->hdr._rsvd = ntohs(whdr._rsvd);
- sp->hdr.serviceId = ntohs(whdr.serviceId);
- return 0;
-}
-
-/*
- * handle data received on the local endpoint
- * - may be called in interrupt context
- *
- * [!] Note that as this is called from the encap_rcv hook, the socket is not
- * held locked by the caller and nothing prevents sk_user_data on the UDP from
- * being cleared in the middle of processing this function.
- *
- * Called with the RCU read lock held from the IP layer via UDP.
- */
-int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
-{
- struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
- struct rxrpc_connection *conn;
- struct rxrpc_channel *chan;
- struct rxrpc_call *call = NULL;
- struct rxrpc_skb_priv *sp;
- struct rxrpc_peer *peer = NULL;
- struct rxrpc_sock *rx = NULL;
- unsigned int channel;
-
- _enter("%p", udp_sk);
-
- if (unlikely(!local)) {
- kfree_skb(skb);
- return 0;
- }
- if (skb->tstamp == 0)
- skb->tstamp = ktime_get_real();
-
- rxrpc_new_skb(skb, rxrpc_skb_received);
-
- skb_pull(skb, sizeof(struct udphdr));
-
- /* The UDP protocol already released all skb resources;
- * we are free to add our own data there.
- */
- sp = rxrpc_skb(skb);
-
- /* dig out the RxRPC connection details */
- if (rxrpc_extract_header(sp, skb) < 0)
- goto bad_message;
-
- if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
- static int lose;
- if ((lose++ & 7) == 7) {
- trace_rxrpc_rx_lose(sp);
- rxrpc_free_skb(skb, rxrpc_skb_lost);
- return 0;
- }
- }
-
- if (skb->tstamp == 0)
- skb->tstamp = ktime_get_real();
- trace_rxrpc_rx_packet(sp);
-
- switch (sp->hdr.type) {
- case RXRPC_PACKET_TYPE_VERSION:
- if (rxrpc_to_client(sp))
- goto discard;
- rxrpc_post_packet_to_local(local, skb);
- goto out;
-
- case RXRPC_PACKET_TYPE_BUSY:
- if (rxrpc_to_server(sp))
- goto discard;
- fallthrough;
- case RXRPC_PACKET_TYPE_ACK:
- case RXRPC_PACKET_TYPE_ACKALL:
- if (sp->hdr.callNumber == 0)
- goto bad_message;
- fallthrough;
- case RXRPC_PACKET_TYPE_ABORT:
- break;
-
- case RXRPC_PACKET_TYPE_DATA:
- if (sp->hdr.callNumber == 0 ||
- sp->hdr.seq == 0)
- goto bad_message;
- if (!rxrpc_validate_data(skb))
- goto bad_message;
-
- /* Unshare the packet so that it can be modified for in-place
- * decryption.
- */
- if (sp->hdr.securityIndex != 0) {
- struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC);
- if (!nskb) {
- rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem);
- goto out;
- }
-
- if (nskb != skb) {
- rxrpc_eaten_skb(skb, rxrpc_skb_received);
- skb = nskb;
- rxrpc_new_skb(skb, rxrpc_skb_unshared);
- sp = rxrpc_skb(skb);
- }
- }
- break;
-
- case RXRPC_PACKET_TYPE_CHALLENGE:
- if (rxrpc_to_server(sp))
- goto discard;
- break;
- case RXRPC_PACKET_TYPE_RESPONSE:
- if (rxrpc_to_client(sp))
- goto discard;
- break;
-
- /* Packet types 9-11 should just be ignored. */
- case RXRPC_PACKET_TYPE_PARAMS:
- case RXRPC_PACKET_TYPE_10:
- case RXRPC_PACKET_TYPE_11:
- goto discard;
-
- default:
- _proto("Rx Bad Packet Type %u", sp->hdr.type);
- goto bad_message;
- }
-
- if (sp->hdr.serviceId == 0)
- goto bad_message;
-
- if (rxrpc_to_server(sp)) {
- /* Weed out packets to services we're not offering. Packets
- * that would begin a call are explicitly rejected and the rest
- * are just discarded.
- */
- rx = rcu_dereference(local->service);
- if (!rx || (sp->hdr.serviceId != rx->srx.srx_service &&
- sp->hdr.serviceId != rx->second_service)) {
- if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
- sp->hdr.seq == 1)
- goto unsupported_service;
- goto discard;
- }
- }
-
- conn = rxrpc_find_connection_rcu(local, skb, &peer);
- if (conn) {
- if (sp->hdr.securityIndex != conn->security_ix)
- goto wrong_security;
-
- if (sp->hdr.serviceId != conn->service_id) {
- int old_id;
-
- if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags))
- goto reupgrade;
- old_id = cmpxchg(&conn->service_id, conn->params.service_id,
- sp->hdr.serviceId);
-
- if (old_id != conn->params.service_id &&
- old_id != sp->hdr.serviceId)
- goto reupgrade;
- }
-
- if (sp->hdr.callNumber == 0) {
- /* Connection-level packet */
- _debug("CONN %p {%d}", conn, conn->debug_id);
- rxrpc_post_packet_to_conn(conn, skb);
- goto out;
- }
-
- if ((int)sp->hdr.serial - (int)conn->hi_serial > 0)
- conn->hi_serial = sp->hdr.serial;
-
- /* Call-bound packets are routed by connection channel. */
- channel = sp->hdr.cid & RXRPC_CHANNELMASK;
- chan = &conn->channels[channel];
-
- /* Ignore really old calls */
- if (sp->hdr.callNumber < chan->last_call)
- goto discard;
-
- if (sp->hdr.callNumber == chan->last_call) {
- if (chan->call ||
- sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
- goto discard;
-
- /* For the previous service call, if completed
- * successfully, we discard all further packets.
- */
- if (rxrpc_conn_is_service(conn) &&
- chan->last_type == RXRPC_PACKET_TYPE_ACK)
- goto discard;
-
- /* But otherwise we need to retransmit the final packet
- * from data cached in the connection record.
- */
- if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
- trace_rxrpc_rx_data(chan->call_debug_id,
- sp->hdr.seq,
- sp->hdr.serial,
- sp->hdr.flags, 0);
- rxrpc_post_packet_to_conn(conn, skb);
- goto out;
- }
-
- call = rcu_dereference(chan->call);
-
- if (sp->hdr.callNumber > chan->call_id) {
- if (rxrpc_to_client(sp))
- goto reject_packet;
- if (call)
- rxrpc_input_implicit_end_call(rx, conn, call);
- call = NULL;
- }
-
- if (call) {
- if (sp->hdr.serviceId != call->service_id)
- call->service_id = sp->hdr.serviceId;
- if ((int)sp->hdr.serial - (int)call->rx_serial > 0)
- call->rx_serial = sp->hdr.serial;
- if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags))
- set_bit(RXRPC_CALL_RX_HEARD, &call->flags);
- }
- }
-
- if (!call || refcount_read(&call->ref) == 0) {
- if (rxrpc_to_client(sp) ||
- sp->hdr.type != RXRPC_PACKET_TYPE_DATA)
- goto bad_message;
- if (sp->hdr.seq != 1)
- goto discard;
- call = rxrpc_new_incoming_call(local, rx, skb);
- if (!call)
- goto reject_packet;
- }
-
- /* Process a call packet; this either discards or passes on the ref
- * elsewhere.
- */
- rxrpc_input_call_packet(call, skb);
- goto out;
-
-discard:
- rxrpc_free_skb(skb, rxrpc_skb_freed);
-out:
- trace_rxrpc_rx_done(0, 0);
- return 0;
-
-wrong_security:
- trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
- RXKADINCONSISTENCY, EBADMSG);
- skb->priority = RXKADINCONSISTENCY;
- goto post_abort;
-
-unsupported_service:
- trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
- RX_INVALID_OPERATION, EOPNOTSUPP);
- skb->priority = RX_INVALID_OPERATION;
- goto post_abort;
-
-reupgrade:
- trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
- RX_PROTOCOL_ERROR, EBADMSG);
- goto protocol_error;
-
-bad_message:
- trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
- RX_PROTOCOL_ERROR, EBADMSG);
-protocol_error:
- skb->priority = RX_PROTOCOL_ERROR;
-post_abort:
- skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
-reject_packet:
- trace_rxrpc_rx_done(skb->mark, skb->priority);
- rxrpc_reject_packet(local, skb);
- _leave(" [badmsg]");
- return 0;
+ spin_lock(&conn->bundle->channel_lock);
+ __rxrpc_disconnect_call(conn, call);
+ spin_unlock(&conn->bundle->channel_lock);
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-21 15:27:41 +0100