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-rw-r--r--net/sctp/associola.c1
-rw-r--r--net/sctp/output.c7
-rw-r--r--net/sctp/outqueue.c34
-rw-r--r--net/sctp/sm_sideeffect.c27
-rw-r--r--net/sctp/sm_statefuns.c16
5 files changed, 53 insertions, 32 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 35b6a023a6d0..ff1dc5bd936c 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1025,6 +1025,7 @@ static void sctp_assoc_bh_rcv(struct work_struct *work)
struct sctp_chunk *chunk;
struct sock *sk;
struct sctp_inq *inqueue;
+ struct sctp_outq *outq;
int state;
sctp_subtype_t subtype;
int error = 0;
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 6d45bae93b46..abcd00dc05eb 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -157,7 +157,8 @@ void sctp_packet_free(struct sctp_packet *packet)
* packet can be sent only after receiving the COOKIE_ACK.
*/
sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *packet,
- struct sctp_chunk *chunk)
+ struct sctp_chunk *chunk,
+ int one_packet)
{
sctp_xmit_t retval;
int error = 0;
@@ -175,7 +176,9 @@ sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *packet,
/* If we have an empty packet, then we can NOT ever
* return PMTU_FULL.
*/
- retval = sctp_packet_append_chunk(packet, chunk);
+ if (!one_packet)
+ retval = sctp_packet_append_chunk(packet,
+ chunk);
}
break;
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index ace6770e9048..70ead8dc3485 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -702,6 +702,7 @@ int sctp_outq_uncork(struct sctp_outq *q)
return error;
}
+
/*
* Try to flush an outqueue.
*
@@ -725,6 +726,7 @@ int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
sctp_xmit_t status;
int error = 0;
int start_timer = 0;
+ int one_packet = 0;
/* These transports have chunks to send. */
struct list_head transport_list;
@@ -830,20 +832,33 @@ int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
if (sctp_test_T_bit(chunk)) {
packet->vtag = asoc->c.my_vtag;
}
- case SCTP_CID_SACK:
- case SCTP_CID_HEARTBEAT:
+ /* The following chunks are "response" chunks, i.e.
+ * they are generated in response to something we
+ * received. If we are sending these, then we can
+ * send only 1 packet containing these chunks.
+ */
case SCTP_CID_HEARTBEAT_ACK:
- case SCTP_CID_SHUTDOWN:
case SCTP_CID_SHUTDOWN_ACK:
- case SCTP_CID_ERROR:
- case SCTP_CID_COOKIE_ECHO:
case SCTP_CID_COOKIE_ACK:
- case SCTP_CID_ECN_ECNE:
+ case SCTP_CID_COOKIE_ECHO:
+ case SCTP_CID_ERROR:
case SCTP_CID_ECN_CWR:
- case SCTP_CID_ASCONF:
case SCTP_CID_ASCONF_ACK:
+ one_packet = 1;
+ /* Fall throught */
+
+ case SCTP_CID_SACK:
+ case SCTP_CID_HEARTBEAT:
+ case SCTP_CID_SHUTDOWN:
+ case SCTP_CID_ECN_ECNE:
+ case SCTP_CID_ASCONF:
case SCTP_CID_FWD_TSN:
- sctp_packet_transmit_chunk(packet, chunk);
+ status = sctp_packet_transmit_chunk(packet, chunk,
+ one_packet);
+ if (status != SCTP_XMIT_OK) {
+ /* put the chunk back */
+ list_add(&chunk->list, &q->control_chunk_list);
+ }
break;
default:
@@ -974,7 +989,7 @@ int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
atomic_read(&chunk->skb->users) : -1);
/* Add the chunk to the packet. */
- status = sctp_packet_transmit_chunk(packet, chunk);
+ status = sctp_packet_transmit_chunk(packet, chunk, 0);
switch (status) {
case SCTP_XMIT_PMTU_FULL:
@@ -1239,7 +1254,6 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
* Make sure the empty queue handler will get run later.
*/
q->empty = (list_empty(&q->out_chunk_list) &&
- list_empty(&q->control_chunk_list) &&
list_empty(&q->retransmit));
if (!q->empty)
goto finish;
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index b083312c725a..9732c797e8ed 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -664,7 +664,7 @@ static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
struct sctp_association *asoc,
struct sctp_sackhdr *sackh)
{
- int err;
+ int err = 0;
if (sctp_outq_sack(&asoc->outqueue, sackh)) {
/* There are no more TSNs awaiting SACK. */
@@ -672,11 +672,6 @@ static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds,
SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN),
asoc->state, asoc->ep, asoc, NULL,
GFP_ATOMIC);
- } else {
- /* Windows may have opened, so we need
- * to check if we have DATA to transmit
- */
- err = sctp_outq_flush(&asoc->outqueue, 0);
}
return err;
@@ -1481,8 +1476,15 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
break;
case SCTP_CMD_DISCARD_PACKET:
- /* We need to discard the whole packet. */
+ /* We need to discard the whole packet.
+ * Uncork the queue since there might be
+ * responses pending
+ */
chunk->pdiscard = 1;
+ if (asoc) {
+ sctp_outq_uncork(&asoc->outqueue);
+ local_cork = 0;
+ }
break;
case SCTP_CMD_RTO_PENDING:
@@ -1553,8 +1555,15 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
}
out:
- if (local_cork)
- sctp_outq_uncork(&asoc->outqueue);
+ /* If this is in response to a received chunk, wait until
+ * we are done with the packet to open the queue so that we don't
+ * send multiple packets in response to a single request.
+ */
+ if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) {
+ if (chunk->end_of_packet || chunk->singleton)
+ sctp_outq_uncork(&asoc->outqueue);
+ } else if (local_cork)
+ sctp_outq_uncork(&asoc->outqueue);
return error;
nomem:
error = -ENOMEM;
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 0c9d5a6950fe..b66a41d03c0d 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -795,8 +795,6 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START,
SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE));
- sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
-
/* This will send the COOKIE ACK */
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
@@ -883,7 +881,6 @@ sctp_disposition_t sctp_sf_do_5_1E_ca(const struct sctp_endpoint *ep,
if (asoc->autoclose)
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START,
SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE));
- sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
/* It may also notify its ULP about the successful
* establishment of the association with a Communication Up
@@ -1781,7 +1778,6 @@ static sctp_disposition_t sctp_sf_do_dupcook_b(const struct sctp_endpoint *ep,
goto nomem;
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
- sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
/* RFC 2960 5.1 Normal Establishment of an Association
*
@@ -1898,12 +1894,13 @@ static sctp_disposition_t sctp_sf_do_dupcook_d(const struct sctp_endpoint *ep,
}
}
- sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
repl = sctp_make_cookie_ack(new_asoc, chunk);
if (!repl)
goto nomem;
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+
if (ev)
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
SCTP_ULPEVENT(ev));
@@ -1911,9 +1908,6 @@ static sctp_disposition_t sctp_sf_do_dupcook_d(const struct sctp_endpoint *ep,
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
SCTP_ULPEVENT(ai_ev));
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
- sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
-
return SCTP_DISPOSITION_CONSUME;
nomem:
@@ -3970,9 +3964,6 @@ sctp_disposition_t sctp_sf_unk_chunk(const struct sctp_endpoint *ep,
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
break;
case SCTP_CID_ACTION_DISCARD_ERR:
- /* Discard the packet. */
- sctp_sf_pdiscard(ep, asoc, type, arg, commands);
-
/* Generate an ERROR chunk as response. */
hdr = unk_chunk->chunk_hdr;
err_chunk = sctp_make_op_error(asoc, unk_chunk,
@@ -3982,6 +3973,9 @@ sctp_disposition_t sctp_sf_unk_chunk(const struct sctp_endpoint *ep,
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
SCTP_CHUNK(err_chunk));
}
+
+ /* Discard the packet. */
+ sctp_sf_pdiscard(ep, asoc, type, arg, commands);
return SCTP_DISPOSITION_CONSUME;
break;
case SCTP_CID_ACTION_SKIP:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.