1 files changed, 29 insertions, 0 deletions

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index c8d5023606a..2d2d81ef4a6 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -400,6 +400,7 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
         sctp_subtype_t subtype;
         sctp_state_t state;
         int error = 0;
+        int first_time = 1;     /* is this the first time through the looop */
 
         if (ep->base.dead)
                 return;
@@ -411,6 +412,29 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
         while (NULL != (chunk = sctp_inq_pop(inqueue))) {
                 subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
 
+                /* If the first chunk in the packet is AUTH, do special
+                 * processing specified in Section 6.3 of SCTP-AUTH spec
+                 */
+                if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
+                        struct sctp_chunkhdr *next_hdr;
+
+                        next_hdr = sctp_inq_peek(inqueue);
+                        if (!next_hdr)
+                                goto normal;
+
+                        /* If the next chunk is COOKIE-ECHO, skip the AUTH
+                         * chunk while saving a pointer to it so we can do
+                         * Authentication later (during cookie-echo
+                         * processing).
+                         */
+                        if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
+                                chunk->auth_chunk = skb_clone(chunk->skb,
+                                                                GFP_ATOMIC);
+                                chunk->auth = 1;
+                                continue;
+                        }
+                }
+normal:
                 /* We might have grown an association since last we
                  * looked, so try again.
                  *
@@ -426,6 +450,8 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
                 }
 
                 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
+                if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
+                        continue;
 
                 /* Remember where the last DATA chunk came from so we
                  * know where to send the SACK.
@@ -449,5 +475,8 @@ static void sctp_endpoint_bh_rcv(struct work_struct *work)
                  */
                 if (!sctp_sk(sk)->ep)
                         break;
+
+                if (first_time)
+                        first_time = 0;
         }
 }