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Diffstat (limited to 'net/sctp/sm_statefuns.c')
-rw-r--r--net/sctp/sm_statefuns.c68
1 files changed, 61 insertions, 7 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 7288192f7df5..c8fae1983dd1 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -334,6 +334,15 @@ sctp_disposition_t sctp_sf_do_5_1B_init(const struct sctp_endpoint *ep,
if (!sctp_chunk_length_valid(chunk, sizeof(sctp_init_chunk_t)))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* If the INIT is coming toward a closing socket, we'll send back
+ * and ABORT. Essentially, this catches the race of INIT being
+ * backloged to the socket at the same time as the user isses close().
+ * Since the socket and all its associations are going away, we
+ * can treat this OOTB
+ */
+ if (sctp_sstate(ep->base.sk, CLOSING))
+ return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
+
/* Verify the INIT chunk before processing it. */
err_chunk = NULL;
if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
@@ -962,7 +971,7 @@ sctp_disposition_t sctp_sf_sendbeat_8_3(const struct sctp_endpoint *ep,
{
struct sctp_transport *transport = (struct sctp_transport *) arg;
- if (asoc->overall_error_count > asoc->max_retrans) {
+ if (asoc->overall_error_count >= asoc->max_retrans) {
sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
SCTP_ERROR(ETIMEDOUT));
/* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */
@@ -1106,7 +1115,8 @@ sctp_disposition_t sctp_sf_backbeat_8_3(const struct sctp_endpoint *ep,
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* Make sure that the HEARTBEAT-ACK chunk has a valid length. */
- if (!sctp_chunk_length_valid(chunk, sizeof(sctp_heartbeat_chunk_t)))
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t) +
+ sizeof(sctp_sender_hb_info_t)))
return sctp_sf_violation_chunklen(ep, asoc, type, arg,
commands);
@@ -2561,6 +2571,12 @@ sctp_disposition_t sctp_sf_do_9_2_shutdown(const struct sctp_endpoint *ep,
chunk->subh.shutdown_hdr = sdh;
ctsn = ntohl(sdh->cum_tsn_ack);
+ if (TSN_lt(ctsn, asoc->ctsn_ack_point)) {
+ SCTP_DEBUG_PRINTK("ctsn %x\n", ctsn);
+ SCTP_DEBUG_PRINTK("ctsn_ack_point %x\n", asoc->ctsn_ack_point);
+ return SCTP_DISPOSITION_DISCARD;
+ }
+
/* If Cumulative TSN Ack beyond the max tsn currently
* send, terminating the association and respond to the
* sender with an ABORT.
@@ -2624,6 +2640,7 @@ sctp_disposition_t sctp_sf_do_9_2_shut_ctsn(const struct sctp_endpoint *ep,
{
struct sctp_chunk *chunk = arg;
sctp_shutdownhdr_t *sdh;
+ __u32 ctsn;
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
@@ -2635,12 +2652,19 @@ sctp_disposition_t sctp_sf_do_9_2_shut_ctsn(const struct sctp_endpoint *ep,
commands);
sdh = (sctp_shutdownhdr_t *)chunk->skb->data;
+ ctsn = ntohl(sdh->cum_tsn_ack);
+
+ if (TSN_lt(ctsn, asoc->ctsn_ack_point)) {
+ SCTP_DEBUG_PRINTK("ctsn %x\n", ctsn);
+ SCTP_DEBUG_PRINTK("ctsn_ack_point %x\n", asoc->ctsn_ack_point);
+ return SCTP_DISPOSITION_DISCARD;
+ }
/* If Cumulative TSN Ack beyond the max tsn currently
* send, terminating the association and respond to the
* sender with an ABORT.
*/
- if (!TSN_lt(ntohl(sdh->cum_tsn_ack), asoc->next_tsn))
+ if (!TSN_lt(ctsn, asoc->next_tsn))
return sctp_sf_violation_ctsn(ep, asoc, type, arg, commands);
/* verify, by checking the Cumulative TSN Ack field of the
@@ -2867,6 +2891,9 @@ sctp_disposition_t sctp_sf_eat_data_6_2(const struct sctp_endpoint *ep,
goto discard_force;
case SCTP_IERROR_NO_DATA:
goto consume;
+ case SCTP_IERROR_PROTO_VIOLATION:
+ return sctp_sf_abort_violation(ep, asoc, chunk, commands,
+ (u8 *)chunk->subh.data_hdr, sizeof(sctp_datahdr_t));
default:
BUG();
}
@@ -2977,6 +3004,9 @@ sctp_disposition_t sctp_sf_eat_data_fast_4_4(const struct sctp_endpoint *ep,
break;
case SCTP_IERROR_NO_DATA:
goto consume;
+ case SCTP_IERROR_PROTO_VIOLATION:
+ return sctp_sf_abort_violation(ep, asoc, chunk, commands,
+ (u8 *)chunk->subh.data_hdr, sizeof(sctp_datahdr_t));
default:
BUG();
}
@@ -3519,6 +3549,12 @@ sctp_disposition_t sctp_sf_do_asconf(const struct sctp_endpoint *ep,
asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial);
if (!asconf_ack)
return SCTP_DISPOSITION_DISCARD;
+
+ /* Reset the transport so that we select the correct one
+ * this time around. This is to make sure that we don't
+ * accidentally use a stale transport that's been removed.
+ */
+ asconf_ack->transport = NULL;
} else {
/* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since
* it must be either a stale packet or from an attacker.
@@ -4546,9 +4582,9 @@ sctp_disposition_t sctp_sf_do_prm_send(const struct sctp_endpoint *ep,
void *arg,
sctp_cmd_seq_t *commands)
{
- struct sctp_chunk *chunk = arg;
+ struct sctp_datamsg *msg = arg;
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk));
+ sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg));
return SCTP_DISPOSITION_CONSUME;
}
@@ -5847,6 +5883,9 @@ static int sctp_eat_data(const struct sctp_association *asoc,
__u32 tsn;
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
struct sock *sk = asoc->base.sk;
+ u16 ssn;
+ u16 sid;
+ u8 ordered = 0;
data_hdr = chunk->subh.data_hdr = (sctp_datahdr_t *)chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_datahdr_t));
@@ -5986,8 +6025,10 @@ static int sctp_eat_data(const struct sctp_association *asoc,
*/
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
SCTP_INC_STATS(SCTP_MIB_INUNORDERCHUNKS);
- else
+ else {
SCTP_INC_STATS(SCTP_MIB_INORDERCHUNKS);
+ ordered = 1;
+ }
/* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
*
@@ -5997,7 +6038,8 @@ static int sctp_eat_data(const struct sctp_association *asoc,
* with cause set to "Invalid Stream Identifier" (See Section 3.3.10)
* and discard the DATA chunk.
*/
- if (ntohs(data_hdr->stream) >= asoc->c.sinit_max_instreams) {
+ sid = ntohs(data_hdr->stream);
+ if (sid >= asoc->c.sinit_max_instreams) {
/* Mark tsn as received even though we drop it */
sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn));
@@ -6010,6 +6052,18 @@ static int sctp_eat_data(const struct sctp_association *asoc,
return SCTP_IERROR_BAD_STREAM;
}
+ /* Check to see if the SSN is possible for this TSN.
+ * The biggest gap we can record is 4K wide. Since SSNs wrap
+ * at an unsigned short, there is no way that an SSN can
+ * wrap and for a valid TSN. We can simply check if the current
+ * SSN is smaller then the next expected one. If it is, it wrapped
+ * and is invalid.
+ */
+ ssn = ntohs(data_hdr->ssn);
+ if (ordered && SSN_lt(ssn, sctp_ssn_peek(&asoc->ssnmap->in, sid))) {
+ return SCTP_IERROR_PROTO_VIOLATION;
+ }
+
/* Send the data up to the user. Note: Schedule the
* SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK
* chunk needs the updated rwnd.
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-23 18:11:36 +0300