* Verification Tag field to Tag_A, and also provide its own
* Verification Tag (Tag_Z) in the Initiate Tag field.
*
- * Verification Tag: No checking.
+ * Verification Tag: Must be 0.
*
* Inputs
* (endpoint, asoc, chunk)
(sk->sk_ack_backlog >= sk->sk_max_ack_backlog)))
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
+ * Tag.
+ */
+ if (chunk->sctp_hdr->vtag != 0)
+ 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,
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;
const sctp_subtype_t type, void *arg,
sctp_cmd_seq_t *commands)
{
+ struct sctp_chunk *chunk = arg;
struct sctp_ulpevent *ev;
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* RFC 2960 5.1 Normal Establishment of an Association
*
* E) Upon reception of the COOKIE ACK, endpoint "A" will move
struct sctp_chunk *reply;
size_t paylen = 0;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. If the received
- * Verification Tag value does not match the receiver's own
- * tag value, the receiver shall silently discard the packet...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* 8.3 The receiver of the HEARTBEAT should immediately
sctp_sender_hb_info_t *hbinfo;
unsigned long max_interval;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. ...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data;
if (!chunk->singleton)
return SCTP_DISPOSITION_VIOLATION;
+ /* 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);
+
/* Grab the INIT header. */
chunk->subh.init_hdr = (sctp_inithdr_t *) chunk->skb->data;
sctp_init_chunk_t *peer_init;
struct sctp_ulpevent *ev;
struct sctp_chunk *repl;
+ struct sctp_chunk *err;
+ sctp_disposition_t disposition;
/* new_asoc is a brand-new association, so these are not yet
* side effects--it is safe to run them here.
return SCTP_DISPOSITION_CONSUME;
}
+ /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes
+ * the peer has restarted (Action A), it MUST NOT setup a new
+ * association but instead resend the SHUTDOWN ACK and send an ERROR
+ * chunk with a "Cookie Received while Shutting Down" error cause to
+ * its peer.
+ */
+ if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) {
+ disposition = sctp_sf_do_9_2_reshutack(ep, asoc,
+ SCTP_ST_CHUNK(chunk->chunk_hdr->type),
+ chunk, commands);
+ if (SCTP_DISPOSITION_NOMEM == disposition)
+ goto nomem;
+
+ err = sctp_make_op_error(asoc, chunk,
+ SCTP_ERROR_COOKIE_IN_SHUTDOWN,
+ NULL, 0);
+ if (err)
+ sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
+ SCTP_CHUNK(err));
+
+ return SCTP_DISPOSITION_CONSUME;
+ }
+
/* For now, fail any unsent/unacked data. Consider the optional
* choice of resending of this data.
*/
sctp_addto_chunk(reply, sizeof(bht), &bht);
+ /* Clear peer's init_tag cached in assoc as we are sending a new INIT */
+ sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL());
+
/* Cast away the const modifier, as we want to just
* rerun it through as a sideffect.
*/
skb_pull(chunk->skb, sizeof(sctp_shutdownhdr_t));
chunk->subh.shutdown_hdr = sdh;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. If the received
- * Verification Tag value does not match the receiver's own
- * tag value, the receiver shall silently discard the packet...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* Upon the reception of the SHUTDOWN, the peer endpoint shall
sctp_cwrhdr_t *cwr;
struct sctp_chunk *chunk = arg;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. If the received
- * Verification Tag value does not match the receiver's own
- * tag value, the receiver shall silently discard the packet...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
cwr = (sctp_cwrhdr_t *) chunk->skb->data;
sctp_ecnehdr_t *ecne;
struct sctp_chunk *chunk = arg;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. If the received
- * Verification Tag value does not match the receiver's own
- * tag value, the receiver shall silently discard the packet...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
ecne = (sctp_ecnehdr_t *) chunk->skb->data;
int tmp;
__u32 tsn;
- /* RFC 2960 8.5 Verification Tag
- *
- * When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag.
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag) {
+ 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);
int tmp;
__u32 tsn;
- /* RFC 2960 8.5 Verification Tag
- *
- * When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag.
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag) {
+ 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);
sctp_sackhdr_t *sackh;
__u32 ctsn;
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. ...
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
/* Pull the SACK chunk from the data buffer */
struct sctp_chunk *reply;
struct sctp_ulpevent *ev;
+ if (!sctp_vtag_verify(chunk, asoc))
+ return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
/* 10.2 H) SHUTDOWN COMPLETE notification
*
* When SCTP completes the shutdown procedures (section 9.2) this
__u16 len;
__u32 tsn;
- /* RFC 2960 8.5 Verification Tag
- *
- * When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag.
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag) {
+ 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);
__u16 len;
__u32 tsn;
- /* RFC 2960 8.5 Verification Tag
- *
- * When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag.
- */
- if (ntohl(chunk->sctp_hdr->vtag) != asoc->c.my_vtag) {
+ 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);
SCTP_DEBUG_PRINTK("Processing the unknown chunk id %d.\n", type.chunk);
- /* 8.5 When receiving an SCTP packet, the endpoint MUST ensure
- * that the value in the Verification Tag field of the
- * received SCTP packet matches its own Tag. If the received
- * Verification Tag value does not match the receiver's own
- * tag value, the receiver shall silently discard the packet.
- */
- if (ntohl(unk_chunk->sctp_hdr->vtag) != asoc->c.my_vtag)
+ if (!sctp_vtag_verify(unk_chunk, asoc))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
switch (type.chunk & SCTP_CID_ACTION_MASK) {
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