#include <net/sctp/sm.h>
#include <net/sctp/structs.h>
+static struct sctp_packet *sctp_abort_pkt_new(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ struct sctp_chunk *chunk,
+ const void *payload,
+ size_t paylen);
+static int sctp_eat_data(const struct sctp_association *asoc,
+ struct sctp_chunk *chunk,
+ sctp_cmd_seq_t *commands);
+static struct sctp_packet *sctp_ootb_pkt_new(const struct sctp_association *asoc,
+ const struct sctp_chunk *chunk);
+static void sctp_send_stale_cookie_err(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const struct sctp_chunk *chunk,
+ sctp_cmd_seq_t *commands,
+ struct sctp_chunk *err_chunk);
+static sctp_disposition_t sctp_sf_do_5_2_6_stale(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands);
+static sctp_disposition_t sctp_sf_shut_8_4_5(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands);
+static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk);
+
+static sctp_disposition_t sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
+ __be16 error, int sk_err,
+ const struct sctp_association *asoc,
+ struct sctp_transport *transport);
+
+static sctp_disposition_t sctp_sf_violation_chunklen(
+ const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands);
+
+/* Small helper function that checks if the chunk length
+ * is of the appropriate length. The 'required_length' argument
+ * is set to be the size of a specific chunk we are testing.
+ * Return Values: 1 = Valid length
+ * 0 = Invalid length
+ *
+ */
+static inline int
+sctp_chunk_length_valid(struct sctp_chunk *chunk,
+ __u16 required_length)
+{
+ __u16 chunk_length = ntohs(chunk->chunk_hdr->length);
+
+ if (unlikely(chunk_length < required_length))
+ return 0;
+
+ return 1;
+}
+
/**********************************************************
* These are the state functions for handling chunk events.
**********************************************************/
* should stop the T2-shutdown timer and remove all knowledge of the
* association (and thus the association enters the CLOSED state).
*
- * Verification Tag: 8.5.1(C)
+ * Verification Tag: 8.5.1(C), sctpimpguide 2.41.
* C) Rules for packet carrying SHUTDOWN COMPLETE:
* ...
- * - The receiver of a SHUTDOWN COMPLETE shall accept the packet if the
- * Verification Tag field of the packet matches its own tag OR it is
- * set to its peer's tag and the T bit is set in the Chunk Flags.
- * Otherwise, the receiver MUST silently discard the packet and take
- * no further action. An endpoint MUST ignore the SHUTDOWN COMPLETE if
- * it is not in the SHUTDOWN-ACK-SENT state.
+ * - The receiver of a SHUTDOWN COMPLETE shall accept the packet
+ * if the Verification Tag field of the packet matches its own tag and
+ * the T bit is not set
+ * OR
+ * it is set to its peer's tag and the T bit is set in the Chunk
+ * Flags.
+ * Otherwise, the receiver MUST silently discard the packet
+ * and take no further action. An endpoint MUST ignore the
+ * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state.
*
* Inputs
* (endpoint, asoc, chunk)
*/
ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP,
0, 0, 0, GFP_ATOMIC);
- if (!ev)
- goto nomem;
-
- sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
+ if (ev)
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+ SCTP_ULPEVENT(ev));
/* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint
* will verify that it is in SHUTDOWN-ACK-SENT state, if it is
sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
return SCTP_DISPOSITION_DELETE_TCB;
-
-nomem:
- return SCTP_DISPOSITION_NOMEM;
}
/*
/* 6.10 Bundling
* An endpoint MUST NOT bundle INIT, INIT ACK or
* SHUTDOWN COMPLETE with any other chunks.
+ *
+ * IG Section 2.11.2
+ * Furthermore, we require that the receiver of an INIT chunk MUST
+ * enforce these rules by silently discarding an arriving packet
+ * with an INIT chunk that is bundled with other chunks.
*/
if (!chunk->singleton)
- return SCTP_DISPOSITION_VIOLATION;
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* If the packet is an OOTB packet which is temporarily on the
* control endpoint, respond with an ABORT.
*/
if (!sctp_sstate(sk, LISTENING) ||
(sctp_style(sk, TCP) &&
- (sk->sk_ack_backlog >= sk->sk_max_ack_backlog)))
+ sk_acceptq_is_full(sk)))
return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
/* 3.1 A packet containing an INIT chunk MUST have a zero Verification
if (chunk->sctp_hdr->vtag != 0)
return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
+ /* Make sure that the INIT chunk has a valid length.
+ * Normally, this would cause an ABORT with a Protocol Violation
+ * error, but since we don't have an association, we'll
+ * just discard the packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_init_chunk_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* Verify the INIT chunk before processing it. */
err_chunk = NULL;
if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
GFP_ATOMIC))
goto nomem_init;
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc));
-
/* B) "Z" shall respond immediately with an INIT ACK chunk. */
/* If there are errors need to be reported for unknown parameters,
sizeof(sctp_chunkhdr_t);
if (sctp_assoc_set_bind_addr_from_ep(new_asoc, GFP_ATOMIC) < 0)
- goto nomem_ack;
+ goto nomem_init;
repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len);
if (!repl)
- goto nomem_ack;
+ goto nomem_init;
/* If there are errors need to be reported for unknown parameters,
* include them in the outgoing INIT ACK as "Unrecognized parameter"
sctp_chunk_free(err_chunk);
}
+ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc));
+
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
/*
return SCTP_DISPOSITION_DELETE_TCB;
-nomem_ack:
- if (err_chunk)
- sctp_chunk_free(err_chunk);
nomem_init:
sctp_association_free(new_asoc);
nomem:
+ if (err_chunk)
+ sctp_chunk_free(err_chunk);
return SCTP_DISPOSITION_NOMEM;
}
{
struct sctp_chunk *chunk = arg;
sctp_init_chunk_t *initchunk;
- __u32 init_tag;
struct sctp_chunk *err_chunk;
struct sctp_packet *packet;
- sctp_disposition_t ret;
+ sctp_error_t error;
+
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the INIT-ACK chunk has a valid length */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_initack_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
/* 6.10 Bundling
* An endpoint MUST NOT bundle INIT, INIT ACK or
* SHUTDOWN COMPLETE with any other chunks.
if (!chunk->singleton)
return SCTP_DISPOSITION_VIOLATION;
- if (!sctp_vtag_verify(chunk, asoc))
- return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
-
/* Grab the INIT header. */
chunk->subh.init_hdr = (sctp_inithdr_t *) chunk->skb->data;
- init_tag = ntohl(chunk->subh.init_hdr->init_tag);
-
- /* Verification Tag: 3.3.3
- * If the value of the Initiate Tag in a received INIT ACK
- * chunk is found to be 0, the receiver MUST treat it as an
- * error and close the association by transmitting an ABORT.
- */
- if (!init_tag) {
- struct sctp_chunk *reply = sctp_make_abort(asoc, chunk, 0);
- if (!reply)
- goto nomem;
-
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply));
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_CLOSED));
- SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
- sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
- return SCTP_DISPOSITION_DELETE_TCB;
- }
-
/* Verify the INIT chunk before processing it. */
err_chunk = NULL;
if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT,
SCTP_PACKET(packet));
SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_CLOSED));
- sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB,
- SCTP_NULL());
- return SCTP_DISPOSITION_CONSUME;
+ error = SCTP_ERROR_INV_PARAM;
} else {
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_CLOSED));
- sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB,
- SCTP_NULL());
- return SCTP_DISPOSITION_NOMEM;
+ error = SCTP_ERROR_NO_RESOURCE;
}
} else {
- ret = sctp_sf_tabort_8_4_8(ep, asoc, type, arg,
- commands);
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_CLOSED));
- sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB,
- SCTP_NULL());
- return ret;
+ sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
+ error = SCTP_ERROR_INV_PARAM;
}
+ return sctp_stop_t1_and_abort(commands, error, ECONNREFUSED,
+ asoc, chunk->transport);
}
/* Tag the variable length parameters. Note that we never
sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT,
SCTP_PEER_INIT(initchunk));
+ /* Reset init error count upon receipt of INIT-ACK. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL());
+
/* 5.1 C) "A" shall stop the T1-init timer and leave
* COOKIE-WAIT state. "A" shall then ... start the T1-cookie
* timer, and enter the COOKIE-ECHOED state.
SCTP_CHUNK(err_chunk));
return SCTP_DISPOSITION_CONSUME;
-
-nomem:
- return SCTP_DISPOSITION_NOMEM;
}
/*
struct sctp_association *new_asoc;
sctp_init_chunk_t *peer_init;
struct sctp_chunk *repl;
- struct sctp_ulpevent *ev;
+ struct sctp_ulpevent *ev, *ai_ev = NULL;
int error = 0;
struct sctp_chunk *err_chk_p;
if (ep == sctp_sk((sctp_get_ctl_sock()))->ep)
return sctp_sf_ootb(ep, asoc, type, arg, commands);
+ /* Make sure that the COOKIE_ECHO chunk has a valid length.
+ * In this case, we check that we have enough for at least a
+ * chunk header. More detailed verification is done
+ * in sctp_unpack_cookie().
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* "Decode" the chunk. We have no optional parameters so we
* are in good shape.
*/
chunk->subh.cookie_hdr =
(struct sctp_signed_cookie *)chunk->skb->data;
- skb_pull(chunk->skb,
- ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t));
+ if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) -
+ sizeof(sctp_chunkhdr_t)))
+ goto nomem;
/* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint
* "Z" will reply with a COOKIE ACK chunk after building a TCB
};
}
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc));
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_ESTABLISHED));
- SCTP_INC_STATS(SCTP_MIB_CURRESTAB);
- SCTP_INC_STATS(SCTP_MIB_PASSIVEESTABS);
- sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL());
- if (new_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());
-
- /* Re-build the bind address for the association is done in
+ /* Delay state machine commands until later.
+ *
+ * Re-build the bind address for the association is done in
* the sctp_unpack_cookie() already.
*/
/* This is a brand-new association, so these are not yet side
repl = sctp_make_cookie_ack(new_asoc, chunk);
if (!repl)
- goto nomem_repl;
-
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+ goto nomem_init;
/* RFC 2960 5.1 Normal Establishment of an Association
*
if (!ev)
goto nomem_ev;
+ /* Sockets API Draft Section 5.3.1.6
+ * When a peer sends a Adaptation Layer Indication parameter , SCTP
+ * delivers this notification to inform the application that of the
+ * peers requested adaptation layer.
+ */
+ if (new_asoc->peer.adaptation_ind) {
+ ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc,
+ GFP_ATOMIC);
+ if (!ai_ev)
+ goto nomem_aiev;
+ }
+
+ /* Add all the state machine commands now since we've created
+ * everything. This way we don't introduce memory corruptions
+ * during side-effect processing and correclty count established
+ * associations.
+ */
+ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc));
+ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
+ SCTP_STATE(SCTP_STATE_ESTABLISHED));
+ SCTP_INC_STATS(SCTP_MIB_CURRESTAB);
+ SCTP_INC_STATS(SCTP_MIB_PASSIVEESTABS);
+ sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL());
+
+ if (new_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());
+
+ /* This will send the COOKIE ACK */
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+
+ /* Queue the ASSOC_CHANGE event */
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
+ /* Send up the Adaptation Layer Indication event */
+ if (ai_ev)
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+ SCTP_ULPEVENT(ai_ev));
+
return SCTP_DISPOSITION_CONSUME;
+nomem_aiev:
+ sctp_ulpevent_free(ev);
nomem_ev:
sctp_chunk_free(repl);
-nomem_repl:
nomem_init:
sctp_association_free(new_asoc);
nomem:
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Verify that the chunk length for the COOKIE-ACK is OK.
+ * If we don't do this, any bundled chunks may be junked.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* Reset init error count upon receipt of COOKIE-ACK,
* to avoid problems with the managemement of this
* counter in stale cookie situations when a transition back
* from the COOKIE-ECHOED state to the COOKIE-WAIT
* state is performed.
*/
- sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_RESET,
- SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL());
/* RFC 2960 5.1 Normal Establishment of an Association
*
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
+ /* Sockets API Draft Section 5.3.1.6
+ * When a peer sends a Adaptation Layer Indication parameter , SCTP
+ * delivers this notification to inform the application that of the
+ * peers requested adaptation layer.
+ */
+ if (asoc->peer.adaptation_ind) {
+ ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
+ if (!ev)
+ goto nomem;
+
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+ SCTP_ULPEVENT(ev));
+ }
+
return SCTP_DISPOSITION_CONSUME;
nomem:
return SCTP_DISPOSITION_NOMEM;
}
/* Generate and sendout a heartbeat packet. */
-sctp_disposition_t sctp_sf_heartbeat(const struct sctp_endpoint *ep,
- const struct sctp_association *asoc,
- const sctp_subtype_t type,
- void *arg,
- sctp_cmd_seq_t *commands)
+static sctp_disposition_t sctp_sf_heartbeat(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
{
struct sctp_transport *transport = (struct sctp_transport *) arg;
struct sctp_chunk *reply;
hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t));
hbinfo.daddr = transport->ipaddr;
hbinfo.sent_at = jiffies;
+ hbinfo.hb_nonce = transport->hb_nonce;
/* Send a heartbeat to our peer. */
paylen = sizeof(sctp_sender_hb_info_t);
{
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. */
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_DELETE_TCB;
* HEARTBEAT is sent (see Section 8.3).
*/
- if (transport->hb_allowed) {
+ if (transport->param_flags & SPP_HB_ENABLE) {
if (SCTP_DISPOSITION_NOMEM ==
sctp_sf_heartbeat(ep, asoc, type, arg,
commands))
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the HEARTBEAT chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_heartbeat_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* 8.3 The receiver of the HEARTBEAT should immediately
* respond with a HEARTBEAT ACK that contains the Heartbeat
* Information field copied from the received HEARTBEAT chunk.
*/
chunk->subh.hb_hdr = (sctp_heartbeathdr_t *) chunk->skb->data;
paylen = ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
- skb_pull(chunk->skb, paylen);
+ if (!pskb_pull(chunk->skb, paylen))
+ goto nomem;
reply = sctp_make_heartbeat_ack(asoc, chunk,
chunk->subh.hb_hdr, paylen);
if (!sctp_vtag_verify(chunk, asoc))
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)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
+ /* Make sure that the length of the parameter is what we expect */
+ if (ntohs(hbinfo->param_hdr.length) !=
+ sizeof(sctp_sender_hb_info_t)) {
+ return SCTP_DISPOSITION_DISCARD;
+ }
+
from_addr = hbinfo->daddr;
link = sctp_assoc_lookup_paddr(asoc, &from_addr);
/* This should never happen, but lets log it if so. */
- if (!link) {
- printk(KERN_WARNING
- "%s: Could not find address %d.%d.%d.%d\n",
- __FUNCTION__, NIPQUAD(from_addr.v4.sin_addr));
+ if (unlikely(!link)) {
+ if (from_addr.sa.sa_family == AF_INET6) {
+ printk(KERN_WARNING
+ "%s association %p could not find address "
+ NIP6_FMT "\n",
+ __FUNCTION__,
+ asoc,
+ NIP6(from_addr.v6.sin6_addr));
+ } else {
+ printk(KERN_WARNING
+ "%s association %p could not find address "
+ NIPQUAD_FMT "\n",
+ __FUNCTION__,
+ asoc,
+ NIPQUAD(from_addr.v4.sin_addr.s_addr));
+ }
return SCTP_DISPOSITION_DISCARD;
}
- max_interval = link->hb_interval + link->rto;
+ /* Validate the 64-bit random nonce. */
+ if (hbinfo->hb_nonce != link->hb_nonce)
+ return SCTP_DISPOSITION_DISCARD;
+
+ max_interval = link->hbinterval + link->rto;
/* Check if the timestamp looks valid. */
if (time_after(hbinfo->sent_at, jiffies) ||
/* 6.10 Bundling
* An endpoint MUST NOT bundle INIT, INIT ACK or
* SHUTDOWN COMPLETE with any other chunks.
+ *
+ * IG Section 2.11.2
+ * Furthermore, we require that the receiver of an INIT chunk MUST
+ * enforce these rules by silently discarding an arriving packet
+ * with an INIT chunk that is bundled with other chunks.
*/
if (!chunk->singleton)
- return SCTP_DISPOSITION_VIOLATION;
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* 3.1 A packet containing an INIT chunk MUST have a zero Verification
* Tag.
if (chunk->sctp_hdr->vtag != 0)
return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
+ /* Make sure that the INIT chunk has a valid length.
+ * In this case, we generate a protocol violation since we have
+ * an association established.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_init_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
/* Grab the INIT header. */
chunk->subh.init_hdr = (sctp_inithdr_t *) chunk->skb->data;
if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
sctp_source(chunk),
(sctp_init_chunk_t *)chunk->chunk_hdr,
- GFP_ATOMIC)) {
- retval = SCTP_DISPOSITION_NOMEM;
- goto nomem_init;
- }
+ GFP_ATOMIC))
+ goto nomem;
/* Make sure no new addresses are being added during the
* restart. Do not do this check for COOKIE-WAIT state,
if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk,
commands)) {
retval = SCTP_DISPOSITION_CONSUME;
- goto cleanup_asoc;
+ goto nomem_retval;
}
}
sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
retval = SCTP_DISPOSITION_CONSUME;
+ return retval;
+
+nomem:
+ retval = SCTP_DISPOSITION_NOMEM;
+nomem_retval:
+ if (new_asoc)
+ sctp_association_free(new_asoc);
cleanup:
if (err_chunk)
sctp_chunk_free(err_chunk);
return retval;
-nomem:
- retval = SCTP_DISPOSITION_NOMEM;
- goto cleanup;
-nomem_init:
-cleanup_asoc:
- sctp_association_free(new_asoc);
- goto cleanup;
}
/*
}
+/*
+ * Unexpected INIT-ACK handler.
+ *
+ * Section 5.2.3
+ * If an INIT ACK received by an endpoint in any state other than the
+ * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk.
+ * An unexpected INIT ACK usually indicates the processing of an old or
+ * duplicated INIT chunk.
+*/
+sctp_disposition_t sctp_sf_do_5_2_3_initack(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg, sctp_cmd_seq_t *commands)
+{
+ /* Per the above section, we'll discard the chunk if we have an
+ * endpoint. If this is an OOTB INIT-ACK, treat it as such.
+ */
+ if (ep == sctp_sk((sctp_get_ctl_sock()))->ep)
+ return sctp_sf_ootb(ep, asoc, type, arg, commands);
+ else
+ return sctp_sf_discard_chunk(ep, asoc, type, arg, commands);
+}
/* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A')
*
*/
sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL());
- /* Update the content of current association. */
- sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc));
-
repl = sctp_make_cookie_ack(new_asoc, chunk);
if (!repl)
goto nomem;
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
-
/* Report association restart to upper layer. */
ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0,
new_asoc->c.sinit_num_ostreams,
if (!ev)
goto nomem_ev;
+ /* Update the content of current association. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc));
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
return SCTP_DISPOSITION_CONSUME;
goto nomem_ev;
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
+
+ /* Sockets API Draft Section 5.3.1.6
+ * When a peer sends a Adaptation Layer Indication parameter , SCTP
+ * delivers this notification to inform the application that of the
+ * peers requested adaptation layer.
+ */
+ if (asoc->peer.adaptation_ind) {
+ ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC);
+ if (!ev)
+ goto nomem_ev;
+
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+ SCTP_ULPEVENT(ev));
+ }
+
return SCTP_DISPOSITION_CONSUME;
nomem_ev:
sctp_cmd_seq_t *commands,
struct sctp_association *new_asoc)
{
- struct sctp_ulpevent *ev = NULL;
+ struct sctp_ulpevent *ev = NULL, *ai_ev = NULL;
struct sctp_chunk *repl;
/* Clarification from Implementor's Guide:
* SCTP user upon reception of a valid COOKIE
* ECHO chunk.
*/
- ev = sctp_ulpevent_make_assoc_change(new_asoc, 0,
+ ev = sctp_ulpevent_make_assoc_change(asoc, 0,
SCTP_COMM_UP, 0,
- new_asoc->c.sinit_num_ostreams,
- new_asoc->c.sinit_max_instreams,
+ asoc->c.sinit_num_ostreams,
+ asoc->c.sinit_max_instreams,
GFP_ATOMIC);
if (!ev)
goto nomem;
- sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
- SCTP_ULPEVENT(ev));
+
+ /* Sockets API Draft Section 5.3.1.6
+ * When a peer sends a Adaptation Layer Indication parameter,
+ * SCTP delivers this notification to inform the application
+ * that of the peers requested adaptation layer.
+ */
+ if (asoc->peer.adaptation_ind) {
+ ai_ev = sctp_ulpevent_make_adaptation_indication(asoc,
+ GFP_ATOMIC);
+ if (!ai_ev)
+ goto nomem;
+
+ }
}
sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
if (!repl)
goto nomem;
+ if (ev)
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+ SCTP_ULPEVENT(ev));
+ if (ai_ev)
+ 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:
+ if (ai_ev)
+ sctp_ulpevent_free(ai_ev);
if (ev)
sctp_ulpevent_free(ev);
return SCTP_DISPOSITION_NOMEM;
char action;
struct sctp_chunk *err_chk_p;
+ /* Make sure that the chunk has a valid length from the protocol
+ * perspective. In this case check to make sure we have at least
+ * enough for the chunk header. Cookie length verification is
+ * done later.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* "Decode" the chunk. We have no optional parameters so we
* are in good shape.
*/
chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data;
- skb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) -
- sizeof(sctp_chunkhdr_t));
+ if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) -
+ sizeof(sctp_chunkhdr_t)))
+ goto nomem;
/* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie
* of a duplicate COOKIE ECHO match the Verification Tags of the
if (!sctp_vtag_verify_either(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the ABORT chunk has a valid length.
+ * Since this is an ABORT chunk, we have to discard it
+ * because of the following text:
+ * RFC 2960, Section 3.3.7
+ * If an endpoint receives an ABORT with a format error or for an
+ * association that doesn't exist, it MUST silently discard it.
+ * Becasue the length is "invalid", we can't really discard just
+ * as we do not know its true length. So, to be safe, discard the
+ * packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* Stop the T5-shutdown guard timer. */
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD));
if (!sctp_vtag_verify_either(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the ABORT chunk has a valid length.
+ * Since this is an ABORT chunk, we have to discard it
+ * because of the following text:
+ * RFC 2960, Section 3.3.7
+ * If an endpoint receives an ABORT with a format error or for an
+ * association that doesn't exist, it MUST silently discard it.
+ * Becasue the length is "invalid", we can't really discard just
+ * as we do not know its true length. So, to be safe, discard the
+ * packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* Stop the T2-shutdown timer. */
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN));
struct sctp_chunk *chunk = arg;
sctp_errhdr_t *err;
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+ /* Make sure that the ERROR chunk has a valid length.
+ * The parameter walking depends on this as well.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_operr_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* Process the error here */
/* FUTURE FIXME: When PR-SCTP related and other optional
* parms are emitted, this will have to change to handle multiple
return sctp_sf_do_5_2_6_stale(ep, asoc, type,
arg, commands);
}
+
+ /* It is possible to have malformed error causes, and that
+ * will cause us to end the walk early. However, since
+ * we are discarding the packet, there should be no adverse
+ * affects.
+ */
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
}
*
* The return value is the disposition of the chunk.
*/
-sctp_disposition_t sctp_sf_do_5_2_6_stale(const struct sctp_endpoint *ep,
- const struct sctp_association *asoc,
- const sctp_subtype_t type,
- void *arg,
- sctp_cmd_seq_t *commands)
+static sctp_disposition_t sctp_sf_do_5_2_6_stale(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
{
struct sctp_chunk *chunk = arg;
time_t stale;
sctp_errhdr_t *err;
struct sctp_chunk *reply;
struct sctp_bind_addr *bp;
- int attempts;
+ int attempts = asoc->init_err_counter + 1;
- attempts = asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1;
-
- if (attempts >= asoc->max_init_attempts) {
+ if (attempts > asoc->max_init_attempts) {
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
- SCTP_U32(SCTP_ERROR_STALE_COOKIE));
+ SCTP_PERR(SCTP_ERROR_STALE_COOKIE));
return SCTP_DISPOSITION_DELETE_TCB;
}
* to give ample time to retransmit the new cookie and thus
* yield a higher probability of success on the reattempt.
*/
- stale = ntohl(*(suseconds_t *)((u8 *)err + sizeof(sctp_errhdr_t)));
+ stale = ntohl(*(__be32 *)((u8 *)err + sizeof(sctp_errhdr_t)));
stale = (stale * 2) / 1000;
bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE;
/* Cast away the const modifier, as we want to just
* rerun it through as a sideffect.
*/
- sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_INC,
- SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL());
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
{
struct sctp_chunk *chunk = arg;
unsigned len;
- __u16 error = SCTP_ERROR_NO_ERROR;
+ __be16 error = SCTP_ERROR_NO_ERROR;
if (!sctp_vtag_verify_either(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
- /* Check that chunk header looks valid. */
+ /* Make sure that the ABORT chunk has a valid length.
+ * Since this is an ABORT chunk, we have to discard it
+ * because of the following text:
+ * RFC 2960, Section 3.3.7
+ * If an endpoint receives an ABORT with a format error or for an
+ * association that doesn't exist, it MUST silently discard it.
+ * Becasue the length is "invalid", we can't really discard just
+ * as we do not know its true length. So, to be safe, discard the
+ * packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+ /* See if we have an error cause code in the chunk. */
len = ntohs(chunk->chunk_hdr->length);
if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr))
error = ((sctp_errhdr_t *)chunk->skb->data)->cause;
-
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET));
/* ASSOC_FAILED will DELETE_TCB. */
- sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_U32(error));
+ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
{
struct sctp_chunk *chunk = arg;
unsigned len;
- __u16 error = SCTP_ERROR_NO_ERROR;
+ __be16 error = SCTP_ERROR_NO_ERROR;
if (!sctp_vtag_verify_either(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
- sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
- SCTP_STATE(SCTP_STATE_CLOSED));
- SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
- SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+ /* Make sure that the ABORT chunk has a valid length.
+ * Since this is an ABORT chunk, we have to discard it
+ * because of the following text:
+ * RFC 2960, Section 3.3.7
+ * If an endpoint receives an ABORT with a format error or for an
+ * association that doesn't exist, it MUST silently discard it.
+ * Becasue the length is "invalid", we can't really discard just
+ * as we do not know its true length. So, to be safe, discard the
+ * packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
- /* Check that chunk header looks valid. */
+ /* See if we have an error cause code in the chunk. */
len = ntohs(chunk->chunk_hdr->length);
if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr))
error = ((sctp_errhdr_t *)chunk->skb->data)->cause;
- /* CMD_INIT_FAILED will DELETE_TCB. */
- sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, SCTP_U32(error));
+ return sctp_stop_t1_and_abort(commands, error, ECONNREFUSED, asoc,
+ chunk->transport);
+}
- return SCTP_DISPOSITION_ABORT;
+/*
+ * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state)
+ */
+sctp_disposition_t sctp_sf_cookie_wait_icmp_abort(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
+{
+ return sctp_stop_t1_and_abort(commands, SCTP_ERROR_NO_ERROR,
+ ENOPROTOOPT, asoc,
+ (struct sctp_transport *)arg);
}
/*
* Process an ABORT. (COOKIE-ECHOED state)
- *
- * See sctp_sf_do_9_1_abort() above.
*/
sctp_disposition_t sctp_sf_cookie_echoed_abort(const struct sctp_endpoint *ep,
const struct sctp_association *asoc,
return sctp_sf_cookie_wait_abort(ep, asoc, type, arg, commands);
}
+/*
+ * Stop T1 timer and abort association with "INIT failed".
+ *
+ * This is common code called by several sctp_sf_*_abort() functions above.
+ */
+static sctp_disposition_t sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
+ __be16 error, int sk_err,
+ const struct sctp_association *asoc,
+ struct sctp_transport *transport)
+{
+ SCTP_DEBUG_PRINTK("ABORT received (INIT).\n");
+ sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
+ SCTP_STATE(SCTP_STATE_CLOSED));
+ SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
+ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
+ SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err));
+ /* CMD_INIT_FAILED will DELETE_TCB. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
+ SCTP_PERR(error));
+ return SCTP_DISPOSITION_ABORT;
+}
+
/*
* sctp_sf_do_9_2_shut
*
sctp_disposition_t disposition;
struct sctp_ulpevent *ev;
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+ /* Make sure that the SHUTDOWN chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk,
+ sizeof(struct sctp_shutdown_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* Convert the elaborate header. */
sdh = (sctp_shutdownhdr_t *)chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_shutdownhdr_t));
chunk->subh.shutdown_hdr = sdh;
- if (!sctp_vtag_verify(chunk, asoc))
- return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT
+ * When a peer sends a SHUTDOWN, SCTP delivers this notification to
+ * inform the application that it should cease sending data.
+ */
+ ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC);
+ if (!ev) {
+ disposition = SCTP_DISPOSITION_NOMEM;
+ goto out;
+ }
+ sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
/* Upon the reception of the SHUTDOWN, the peer endpoint shall
* - enter the SHUTDOWN-RECEIVED state,
* received by the SHUTDOWN sender.
*/
sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN,
- SCTP_U32(chunk->subh.shutdown_hdr->cum_tsn_ack));
-
- /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT
- * When a peer sends a SHUTDOWN, SCTP delivers this notification to
- * inform the application that it should cease sending data.
- */
- ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC);
- if (!ev) {
- disposition = SCTP_DISPOSITION_NOMEM;
- goto out;
- }
- sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
+ SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack));
out:
return disposition;
struct sctp_chunk *chunk = (struct sctp_chunk *) arg;
struct sctp_chunk *reply;
+ /* Since we are not going to really process this INIT, there
+ * is no point in verifying chunk boundries. Just generate
+ * the SHUTDOWN ACK.
+ */
reply = sctp_make_shutdown_ack(asoc, chunk);
if (NULL == reply)
goto nomem;
{
sctp_cwrhdr_t *cwr;
struct sctp_chunk *chunk = arg;
+ u32 lowest_tsn;
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_ecne_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
cwr = (sctp_cwrhdr_t *) chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_cwrhdr_t));
- cwr->lowest_tsn = ntohl(cwr->lowest_tsn);
+ lowest_tsn = ntohl(cwr->lowest_tsn);
/* Does this CWR ack the last sent congestion notification? */
- if (TSN_lte(asoc->last_ecne_tsn, cwr->lowest_tsn)) {
+ if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) {
/* Stop sending ECNE. */
sctp_add_cmd_sf(commands,
SCTP_CMD_ECN_CWR,
- SCTP_U32(cwr->lowest_tsn));
+ SCTP_U32(lowest_tsn));
}
return SCTP_DISPOSITION_CONSUME;
}
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_ecne_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
ecne = (sctp_ecnehdr_t *) chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_ecnehdr_t));
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
}
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_data_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
error = sctp_eat_data(asoc, chunk, commands );
switch (error) {
case SCTP_IERROR_NO_ERROR:
break;
case SCTP_IERROR_HIGH_TSN:
case SCTP_IERROR_BAD_STREAM:
+ SCTP_INC_STATS(SCTP_MIB_IN_DATA_CHUNK_DISCARDS);
goto discard_noforce;
case SCTP_IERROR_DUP_TSN:
case SCTP_IERROR_IGNORE_TSN:
+ SCTP_INC_STATS(SCTP_MIB_IN_DATA_CHUNK_DISCARDS);
goto discard_force;
case SCTP_IERROR_NO_DATA:
goto consume;
* document allow. However, an SCTP transmitter MUST NOT be
* more aggressive than the following algorithms allow.
*/
- if (chunk->end_of_packet) {
+ if (chunk->end_of_packet)
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
- }
-
return SCTP_DISPOSITION_CONSUME;
discard_force:
return SCTP_DISPOSITION_DISCARD;
discard_noforce:
- if (chunk->end_of_packet) {
+ if (chunk->end_of_packet)
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
- }
return SCTP_DISPOSITION_DISCARD;
consume:
return SCTP_DISPOSITION_CONSUME;
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
}
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_data_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
error = sctp_eat_data(asoc, chunk, commands );
switch (error) {
case SCTP_IERROR_NO_ERROR:
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the SACK chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_sack_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
/* Pull the SACK chunk from the data buffer */
sackh = sctp_sm_pull_sack(chunk);
/* Was this a bogus SACK? */
/*
* Generate an ABORT in response to a packet.
*
- * Section: 8.4 Handle "Out of the blue" Packets
+ * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41
*
- * 8) The receiver should respond to the sender of the OOTB packet
- * with an ABORT. When sending the ABORT, the receiver of the
- * OOTB packet MUST fill in the Verification Tag field of the
- * outbound packet with the value found in the Verification Tag
- * field of the OOTB packet and set the T-bit in the Chunk Flags
- * to indicate that no TCB was found. After sending this ABORT,
- * the receiver of the OOTB packet shall discard the OOTB packet
- * and take no further action.
+ * 8) The receiver should respond to the sender of the OOTB packet with
+ * an ABORT. When sending the ABORT, the receiver of the OOTB packet
+ * MUST fill in the Verification Tag field of the outbound packet
+ * with the value found in the Verification Tag field of the OOTB
+ * packet and set the T-bit in the Chunk Flags to indicate that the
+ * Verification Tag is reflected. After sending this ABORT, the
+ * receiver of the OOTB packet shall discard the OOTB packet and take
+ * no further action.
*
* Verification Tag:
*
return SCTP_DISPOSITION_NOMEM;
}
+ /* Reflect vtag if T-Bit is set */
+ if (sctp_test_T_bit(abort))
+ packet->vtag = ntohl(chunk->sctp_hdr->vtag);
+
/* Set the skb to the belonging sock for accounting. */
abort->skb->sk = ep->base.sk;
struct sctp_chunk *chunk = arg;
struct sctp_ulpevent *ev;
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+ /* Make sure that the ERROR chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_operr_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
while (chunk->chunk_end > chunk->skb->data) {
ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0,
GFP_ATOMIC);
if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
/* 10.2 H) SHUTDOWN COMPLETE notification
*
* When SCTP completes the shutdown procedures (section 9.2) this
if (!ev)
goto nomem;
+ /* ...send a SHUTDOWN COMPLETE chunk to its peer, */
+ reply = sctp_make_shutdown_complete(asoc, chunk);
+ if (!reply)
+ goto nomem_chunk;
+
+ /* Do all the commands now (after allocation), so that we
+ * have consistent state if memory allocation failes
+ */
sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
/* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD));
- /* ...send a SHUTDOWN COMPLETE chunk to its peer, */
- reply = sctp_make_shutdown_complete(asoc, chunk);
- if (!reply)
- goto nomem;
-
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
SCTP_STATE(SCTP_STATE_CLOSED));
SCTP_INC_STATS(SCTP_MIB_SHUTDOWNS);
sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL());
return SCTP_DISPOSITION_DELETE_TCB;
+nomem_chunk:
+ sctp_ulpevent_free(ev);
nomem:
return SCTP_DISPOSITION_NOMEM;
}
/*
- * RFC 2960, 8.4 - Handle "Out of the blue" Packets
+ * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41.
+ *
* 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should
* respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE.
* When sending the SHUTDOWN COMPLETE, the receiver of the OOTB
* packet must fill in the Verification Tag field of the outbound
* packet with the Verification Tag received in the SHUTDOWN ACK and
- * set the T-bit in the Chunk Flags to indicate that no TCB was
- * found. Otherwise,
+ * set the T-bit in the Chunk Flags to indicate that the Verification
+ * Tag is reflected.
*
* 8) The receiver should respond to the sender of the OOTB packet with
* an ABORT. When sending the ABORT, the receiver of the OOTB packet
* MUST fill in the Verification Tag field of the outbound packet
* with the value found in the Verification Tag field of the OOTB
- * packet and set the T-bit in the Chunk Flags to indicate that no
- * TCB was found. After sending this ABORT, the receiver of the OOTB
- * packet shall discard the OOTB packet and take no further action.
+ * packet and set the T-bit in the Chunk Flags to indicate that the
+ * Verification Tag is reflected. After sending this ABORT, the
+ * receiver of the OOTB packet shall discard the OOTB packet and take
+ * no further action.
*/
sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep,
const struct sctp_association *asoc,
ch = (sctp_chunkhdr_t *) chunk->chunk_hdr;
do {
+ /* Break out if chunk length is less then minimal. */
+ if (ntohs(ch->length) < sizeof(sctp_chunkhdr_t))
+ break;
+
ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
+ if (ch_end > skb->tail)
+ break;
if (SCTP_CID_SHUTDOWN_ACK == ch->type)
ootb_shut_ack = 1;
+ /* RFC 2960, Section 3.3.7
+ * Moreover, under any circumstances, an endpoint that
+ * receives an ABORT MUST NOT respond to that ABORT by
+ * sending an ABORT of its own.
+ */
+ if (SCTP_CID_ABORT == ch->type)
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
ch = (sctp_chunkhdr_t *) ch_end;
} while (ch_end < skb->tail);
/*
* Handle an "Out of the blue" SHUTDOWN ACK.
*
- * Section: 8.4 5)
+ * Section: 8.4 5, sctpimpguide 2.41.
+ *
* 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should
- * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE.
- * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB packet
- * must fill in the Verification Tag field of the outbound packet with
- * the Verification Tag received in the SHUTDOWN ACK and set the
- * T-bit in the Chunk Flags to indicate that no TCB was found.
+ * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE.
+ * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB
+ * packet must fill in the Verification Tag field of the outbound
+ * packet with the Verification Tag received in the SHUTDOWN ACK and
+ * set the T-bit in the Chunk Flags to indicate that the Verification
+ * Tag is reflected.
*
* Inputs
* (endpoint, asoc, type, arg, commands)
*
* The return value is the disposition of the chunk.
*/
-sctp_disposition_t sctp_sf_shut_8_4_5(const struct sctp_endpoint *ep,
- const struct sctp_association *asoc,
- const sctp_subtype_t type,
- void *arg,
- sctp_cmd_seq_t *commands)
+static sctp_disposition_t sctp_sf_shut_8_4_5(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
{
struct sctp_packet *packet = NULL;
struct sctp_chunk *chunk = arg;
return SCTP_DISPOSITION_NOMEM;
}
+ /* Reflect vtag if T-Bit is set */
+ if (sctp_test_T_bit(shut))
+ packet->vtag = ntohl(chunk->sctp_hdr->vtag);
+
/* Set the skb to the belonging sock for accounting. */
shut->skb->sk = ep->base.sk;
SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
+ /* If the chunk length is invalid, we don't want to process
+ * the reset of the packet.
+ */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
return SCTP_DISPOSITION_CONSUME;
}
sctp_addiphdr_t *hdr;
__u32 serial;
+ if (!sctp_vtag_verify(chunk, asoc)) {
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG,
+ SCTP_NULL());
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ }
+
+ /* Make sure that the ASCONF ADDIP chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_addip_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
hdr = (sctp_addiphdr_t *)chunk->skb->data;
serial = ntohl(hdr->serial);
/* ADDIP 4.2 C3) If the value found in the serial number is
* equal to the value stored in the 'Peer-Serial-Number'
* IMPLEMENTATION NOTE: As an optimization a receiver may wish
- * to save the last ASCONF-ACK for some predetermined period of * time and instead of re-processing the ASCONF (with the same
+ * to save the last ASCONF-ACK for some predetermined period of
+ * time and instead of re-processing the ASCONF (with the same
* serial number) it may just re-transmit the ASCONF-ACK.
*/
if (asoc->addip_last_asconf_ack)
sctp_addiphdr_t *addip_hdr;
__u32 sent_serial, rcvd_serial;
+ if (!sctp_vtag_verify(asconf_ack, asoc)) {
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG,
+ SCTP_NULL());
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ }
+
+ /* Make sure that the ADDIP chunk has a valid length. */
+ if (!sctp_chunk_length_valid(asconf_ack, sizeof(sctp_addip_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
addip_hdr = (sctp_addiphdr_t *)asconf_ack->skb->data;
rcvd_serial = ntohl(addip_hdr->serial);
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET,SCTP_NULL());
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNABORTED));
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_ASCONF_ACK));
+ SCTP_PERR(SCTP_ERROR_ASCONF_ACK));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_ABORT;
* processing the rest of the chunks in the packet.
*/
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET,SCTP_NULL());
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNABORTED));
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_ASCONF_ACK));
+ SCTP_PERR(SCTP_ERROR_ASCONF_ACK));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_ABORT;
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
}
+ /* Make sure that the FORWARD_TSN chunk has valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data;
chunk->subh.fwdtsn_hdr = fwdtsn_hdr;
len = ntohs(chunk->chunk_hdr->length);
* send another.
*/
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE());
- /* Start the SACK timer. */
- sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
- SCTP_TO(SCTP_EVENT_TIMEOUT_SACK));
return SCTP_DISPOSITION_CONSUME;
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
}
+ /* Make sure that the FORWARD_TSN chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data;
chunk->subh.fwdtsn_hdr = fwdtsn_hdr;
len = ntohs(chunk->chunk_hdr->length);
if (!sctp_vtag_verify(unk_chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* Make sure that the chunk has a valid length.
+ * Since we don't know the chunk type, we use a general
+ * chunkhdr structure to make a comparison.
+ */
+ if (!sctp_chunk_length_valid(unk_chunk, sizeof(sctp_chunkhdr_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+
switch (type.chunk & SCTP_CID_ACTION_MASK) {
case SCTP_CID_ACTION_DISCARD:
/* Discard the packet. */
*
* 2) If the OOTB packet contains an ABORT chunk, the receiver MUST
* silently discard the OOTB packet and take no further action.
- * Otherwise,
*
* Verification Tag: No verification necessary
*
void *arg,
sctp_cmd_seq_t *commands)
{
+ SCTP_INC_STATS(SCTP_MIB_IN_PKT_DISCARDS);
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL());
return SCTP_DISPOSITION_CONSUME;
return SCTP_DISPOSITION_VIOLATION;
}
+
+/*
+ * Handle a protocol violation when the chunk length is invalid.
+ * "Invalid" length is identified as smaller then the minimal length a
+ * given chunk can be. For example, a SACK chunk has invalid length
+ * if it's length is set to be smaller then the size of sctp_sack_chunk_t.
+ *
+ * We inform the other end by sending an ABORT with a Protocol Violation
+ * error code.
+ *
+ * Section: Not specified
+ * Verification Tag: Nothing to do
+ * Inputs
+ * (endpoint, asoc, chunk)
+ *
+ * Outputs
+ * (reply_msg, msg_up, counters)
+ *
+ * Generate an ABORT chunk and terminate the association.
+ */
+static sctp_disposition_t sctp_sf_violation_chunklen(
+ const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
+{
+ struct sctp_chunk *chunk = arg;
+ struct sctp_chunk *abort = NULL;
+ char err_str[]="The following chunk had invalid length:";
+
+ /* Make the abort chunk. */
+ abort = sctp_make_abort_violation(asoc, chunk, err_str,
+ sizeof(err_str));
+ if (!abort)
+ goto nomem;
+
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
+ SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
+
+ if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) {
+ sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
+ SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNREFUSED));
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
+ SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
+ } else {
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNABORTED));
+ sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
+ SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
+ SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
+ }
+
+ sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL());
+
+ SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
+
+ return SCTP_DISPOSITION_ABORT;
+
+nomem:
+ return SCTP_DISPOSITION_NOMEM;
+}
+
/***************************************************************************
* These are the state functions for handling primitive (Section 10) events.
***************************************************************************/
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC,
SCTP_ASOC((struct sctp_association *) asoc));
+ /* Choose transport for INIT. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
+ SCTP_CHUNK(repl));
+
/* After sending the INIT, "A" starts the T1-init timer and
* enters the COOKIE-WAIT state.
*/
* from its upper layer, but retransmits data to the far end
* if necessary to fill gaps.
*/
- struct msghdr *msg = arg;
- struct sctp_chunk *abort;
+ struct sctp_chunk *abort = arg;
sctp_disposition_t retval;
retval = SCTP_DISPOSITION_CONSUME;
- /* Generate ABORT chunk to send the peer. */
- abort = sctp_make_abort_user(asoc, NULL, msg);
- if (!abort)
- retval = SCTP_DISPOSITION_NOMEM;
- else
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
/* Even if we can't send the ABORT due to low memory delete the
* TCB. This is a departure from our typical NOMEM handling.
*/
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNABORTED));
/* Delete the established association. */
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_USER_ABORT));
+ SCTP_PERR(SCTP_ERROR_USER_ABORT));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
void *arg,
sctp_cmd_seq_t *commands)
{
- struct msghdr *msg = arg;
- struct sctp_chunk *abort;
+ struct sctp_chunk *abort = arg;
sctp_disposition_t retval;
/* Stop T1-init timer */
SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
retval = SCTP_DISPOSITION_CONSUME;
- /* Generate ABORT chunk to send the peer */
- abort = sctp_make_abort_user(asoc, NULL, msg);
- if (!abort)
- retval = SCTP_DISPOSITION_NOMEM;
- else
- sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
SCTP_STATE(SCTP_STATE_CLOSED));
* TCB. This is a departure from our typical NOMEM handling.
*/
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNREFUSED));
/* Delete the established association. */
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
- SCTP_U32(SCTP_ERROR_USER_ABORT));
+ SCTP_PERR(SCTP_ERROR_USER_ABORT));
return retval;
}
struct sctp_chunk *chunk = (struct sctp_chunk *) arg;
struct sctp_chunk *reply;
+ /* There are 2 ways of getting here:
+ * 1) called in response to a SHUTDOWN chunk
+ * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued.
+ *
+ * For the case (2), the arg parameter is set to NULL. We need
+ * to check that we have a chunk before accessing it's fields.
+ */
+ if (chunk) {
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
+ /* Make sure that the SHUTDOWN chunk has a valid length. */
+ if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk_t)))
+ return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+ commands);
+ }
+
/* If it has no more outstanding DATA chunks, the SHUTDOWN receiver
* shall send a SHUTDOWN ACK ...
*/
{
struct sctp_transport *transport = arg;
+ SCTP_INC_STATS(SCTP_MIB_T3_RTX_EXPIREDS);
+
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. */
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_DELETE_TCB;
void *arg,
sctp_cmd_seq_t *commands)
{
+ SCTP_INC_STATS(SCTP_MIB_DELAY_SACK_EXPIREDS);
sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE());
return SCTP_DISPOSITION_CONSUME;
}
/*
- * sctp_sf_t1_timer_expire
+ * sctp_sf_t1_init_timer_expire
*
* Section: 4 Note: 2
* Verification Tag:
* endpoint MUST abort the initialization process and report the
* error to SCTP user.
*
- * 3) If the T1-cookie timer expires, the endpoint MUST retransmit
- * COOKIE ECHO and re-start the T1-cookie timer without changing
- * state. This MUST be repeated up to 'Max.Init.Retransmits' times.
- * After that, the endpoint MUST abort the initialization process and
- * report the error to SCTP user.
- *
* Outputs
* (timers, events)
*
*/
-sctp_disposition_t sctp_sf_t1_timer_expire(const struct sctp_endpoint *ep,
+sctp_disposition_t sctp_sf_t1_init_timer_expire(const struct sctp_endpoint *ep,
const struct sctp_association *asoc,
const sctp_subtype_t type,
void *arg,
sctp_cmd_seq_t *commands)
{
- struct sctp_chunk *repl;
+ struct sctp_chunk *repl = NULL;
struct sctp_bind_addr *bp;
- sctp_event_timeout_t timer = (sctp_event_timeout_t) arg;
- int timeout;
- int attempts;
+ int attempts = asoc->init_err_counter + 1;
- timeout = asoc->timeouts[timer];
- attempts = asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1;
- repl = NULL;
+ SCTP_DEBUG_PRINTK("Timer T1 expired (INIT).\n");
+ SCTP_INC_STATS(SCTP_MIB_T1_INIT_EXPIREDS);
- SCTP_DEBUG_PRINTK("Timer T1 expired.\n");
+ if (attempts <= asoc->max_init_attempts) {
+ bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
+ repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0);
+ if (!repl)
+ return SCTP_DISPOSITION_NOMEM;
- if (attempts < asoc->max_init_attempts) {
- switch (timer) {
- case SCTP_EVENT_TIMEOUT_T1_INIT:
- bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
- repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0);
- break;
+ /* Choose transport for INIT. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
+ SCTP_CHUNK(repl));
- case SCTP_EVENT_TIMEOUT_T1_COOKIE:
- repl = sctp_make_cookie_echo(asoc, NULL);
- break;
+ /* Issue a sideeffect to do the needed accounting. */
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART,
+ SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
- default:
- BUG();
- break;
- };
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+ } else {
+ SCTP_DEBUG_PRINTK("Giving up on INIT, attempts: %d"
+ " max_init_attempts: %d\n",
+ attempts, asoc->max_init_attempts);
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
+ sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
+ return SCTP_DISPOSITION_DELETE_TCB;
+ }
+ return SCTP_DISPOSITION_CONSUME;
+}
+
+/*
+ * sctp_sf_t1_cookie_timer_expire
+ *
+ * Section: 4 Note: 2
+ * Verification Tag:
+ * Inputs
+ * (endpoint, asoc)
+ *
+ * RFC 2960 Section 4 Notes
+ * 3) If the T1-cookie timer expires, the endpoint MUST retransmit
+ * COOKIE ECHO and re-start the T1-cookie timer without changing
+ * state. This MUST be repeated up to 'Max.Init.Retransmits' times.
+ * After that, the endpoint MUST abort the initialization process and
+ * report the error to SCTP user.
+ *
+ * Outputs
+ * (timers, events)
+ *
+ */
+sctp_disposition_t sctp_sf_t1_cookie_timer_expire(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *commands)
+{
+ struct sctp_chunk *repl = NULL;
+ int attempts = asoc->init_err_counter + 1;
+
+ SCTP_DEBUG_PRINTK("Timer T1 expired (COOKIE-ECHO).\n");
+ SCTP_INC_STATS(SCTP_MIB_T1_COOKIE_EXPIREDS);
+
+ if (attempts <= asoc->max_init_attempts) {
+ repl = sctp_make_cookie_echo(asoc, NULL);
if (!repl)
- goto nomem;
+ return SCTP_DISPOSITION_NOMEM;
/* Issue a sideeffect to do the needed accounting. */
- sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART,
- SCTP_TO(timer));
+ sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART,
+ SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
+
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
} else {
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
return SCTP_DISPOSITION_DELETE_TCB;
}
return SCTP_DISPOSITION_CONSUME;
-
-nomem:
- return SCTP_DISPOSITION_NOMEM;
}
/* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN
struct sctp_chunk *reply = NULL;
SCTP_DEBUG_PRINTK("Timer T2 expired.\n");
+ SCTP_INC_STATS(SCTP_MIB_T2_SHUTDOWN_EXPIREDS);
+
if (asoc->overall_error_count >= asoc->max_retrans) {
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
/* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_DELETE_TCB;
struct sctp_chunk *chunk = asoc->addip_last_asconf;
struct sctp_transport *transport = chunk->transport;
+ SCTP_INC_STATS(SCTP_MIB_T4_RTO_EXPIREDS);
+
/* ADDIP 4.1 B1) Increment the error counters and perform path failure
* detection on the appropriate destination address as defined in
* RFC2960 [5] section 8.1 and 8.2.
if (asoc->overall_error_count >= asoc->max_retrans) {
sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO));
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_INC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_DISPOSITION_ABORT;
struct sctp_chunk *reply = NULL;
SCTP_DEBUG_PRINTK("Timer T5 expired.\n");
+ SCTP_INC_STATS(SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS);
reply = sctp_make_abort(asoc, NULL, 0);
if (!reply)
goto nomem;
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply));
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ETIMEDOUT));
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_ERROR));
+ SCTP_PERR(SCTP_ERROR_NO_ERROR));
return SCTP_DISPOSITION_DELETE_TCB;
nomem:
{
int disposition;
+ SCTP_INC_STATS(SCTP_MIB_AUTOCLOSE_EXPIREDS);
+
/* From 9.2 Shutdown of an Association
* Upon receipt of the SHUTDOWN primitive from its upper
* layer, the endpoint enters SHUTDOWN-PENDING state and
********************************************************************/
/* Pull the SACK chunk based on the SACK header. */
-struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk)
+static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk)
{
struct sctp_sackhdr *sack;
unsigned int len;
/* Create an ABORT packet to be sent as a response, with the specified
* error causes.
*/
-struct sctp_packet *sctp_abort_pkt_new(const struct sctp_endpoint *ep,
+static struct sctp_packet *sctp_abort_pkt_new(const struct sctp_endpoint *ep,
const struct sctp_association *asoc,
struct sctp_chunk *chunk,
const void *payload,
sctp_ootb_pkt_free(packet);
return NULL;
}
+
+ /* Reflect vtag if T-Bit is set */
+ if (sctp_test_T_bit(abort))
+ packet->vtag = ntohl(chunk->sctp_hdr->vtag);
+
/* Add specified error causes, i.e., payload, to the
* end of the chunk.
*/
}
/* Allocate a packet for responding in the OOTB conditions. */
-struct sctp_packet *sctp_ootb_pkt_new(const struct sctp_association *asoc,
- const struct sctp_chunk *chunk)
+static struct sctp_packet *sctp_ootb_pkt_new(const struct sctp_association *asoc,
+ const struct sctp_chunk *chunk)
{
struct sctp_packet *packet;
struct sctp_transport *transport;
}
/* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */
-void sctp_send_stale_cookie_err(const struct sctp_endpoint *ep,
- const struct sctp_association *asoc,
- const struct sctp_chunk *chunk,
- sctp_cmd_seq_t *commands,
- struct sctp_chunk *err_chunk)
+static void sctp_send_stale_cookie_err(const struct sctp_endpoint *ep,
+ const struct sctp_association *asoc,
+ const struct sctp_chunk *chunk,
+ sctp_cmd_seq_t *commands,
+ struct sctp_chunk *err_chunk)
{
struct sctp_packet *packet;
/* Process a data chunk */
-int sctp_eat_data(const struct sctp_association *asoc,
- struct sctp_chunk *chunk,
- sctp_cmd_seq_t *commands)
+static int sctp_eat_data(const struct sctp_association *asoc,
+ struct sctp_chunk *chunk,
+ sctp_cmd_seq_t *commands)
{
sctp_datahdr_t *data_hdr;
struct sctp_chunk *err;
sctp_verb_t deliver;
int tmp;
__u32 tsn;
+ int account_value;
+ struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
+ struct sock *sk = asoc->base.sk;
+ int rcvbuf_over = 0;
data_hdr = chunk->subh.data_hdr = (sctp_datahdr_t *)chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_datahdr_t));
/* ASSERT: Now skb->data is really the user data. */
+ /*
+ * If we are established, and we have used up our receive buffer
+ * memory, think about droping the frame.
+ * Note that we have an opportunity to improve performance here.
+ * If we accept one chunk from an skbuff, we have to keep all the
+ * memory of that skbuff around until the chunk is read into user
+ * space. Therefore, once we accept 1 chunk we may as well accept all
+ * remaining chunks in the skbuff. The data_accepted flag helps us do
+ * that.
+ */
+ if ((asoc->state == SCTP_STATE_ESTABLISHED) && (!chunk->data_accepted)) {
+ /*
+ * If the receive buffer policy is 1, then each
+ * association can allocate up to sk_rcvbuf bytes
+ * otherwise, all the associations in aggregate
+ * may allocate up to sk_rcvbuf bytes
+ */
+ if (asoc->ep->rcvbuf_policy)
+ account_value = atomic_read(&asoc->rmem_alloc);
+ else
+ account_value = atomic_read(&sk->sk_rmem_alloc);
+ if (account_value > sk->sk_rcvbuf) {
+ /*
+ * We need to make forward progress, even when we are
+ * under memory pressure, so we always allow the
+ * next tsn after the ctsn ack point to be accepted.
+ * This lets us avoid deadlocks in which we have to
+ * drop frames that would otherwise let us drain the
+ * receive queue.
+ */
+ if ((sctp_tsnmap_get_ctsn(map) + 1) != tsn)
+ return SCTP_IERROR_IGNORE_TSN;
+
+ /*
+ * We're going to accept the frame but we should renege
+ * to make space for it. This will send us down that
+ * path later in this function.
+ */
+ rcvbuf_over = 1;
+ }
+ }
+
/* Process ECN based congestion.
*
* Since the chunk structure is reused for all chunks within
* seems a bit troublesome in that frag_point varies based on
* PMTU. In cases, such as loopback, this might be a rather
* large spill over.
+ * NOTE: If we have a full receive buffer here, we only renege if
+ * our receiver can still make progress without the tsn being
+ * received. We do this because in the event that the associations
+ * receive queue is empty we are filling a leading gap, and since
+ * reneging moves the gap to the end of the tsn stream, we are likely
+ * to stall again very shortly. Avoiding the renege when we fill a
+ * leading gap is a good heuristic for avoiding such steady state
+ * stalls.
*/
if (!asoc->rwnd || asoc->rwnd_over ||
- (datalen > asoc->rwnd + asoc->frag_point)) {
+ (datalen > asoc->rwnd + asoc->frag_point) ||
+ (rcvbuf_over && (!skb_queue_len(&sk->sk_receive_queue)))) {
/* If this is the next TSN, consider reneging to make
* room. Note: Playing nice with a confused sender. A
* space and in the future we may want to detect and
* do more drastic reneging.
*/
- if (sctp_tsnmap_has_gap(&asoc->peer.tsn_map) &&
- (sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1) == tsn) {
+ if (sctp_tsnmap_has_gap(map) &&
+ (sctp_tsnmap_get_ctsn(map) + 1) == tsn) {
SCTP_DEBUG_PRINTK("Reneging for tsn:%u\n", tsn);
deliver = SCTP_CMD_RENEGE;
} else {
* processing the rest of the chunks in the packet.
*/
sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET,SCTP_NULL());
+ sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+ SCTP_ERROR(ECONNABORTED));
sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
- SCTP_U32(SCTP_ERROR_NO_DATA));
+ SCTP_PERR(SCTP_ERROR_NO_DATA));
SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
return SCTP_IERROR_NO_DATA;
if (SCTP_CMD_CHUNK_ULP == deliver)
sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn));
+ chunk->data_accepted = 1;
+
/* Note: Some chunks may get overcounted (if we drop) or overcounted
* if we renege and the chunk arrives again.
*/