[SCTP]: Implement SCTP-AUTH initializations.
[linux-3.10.git] / net / sctp / endpointola.c
index 2237118..c8d5023 100644 (file)
@@ -69,12 +69,56 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
                                                struct sock *sk,
                                                gfp_t gfp)
 {
+       struct sctp_hmac_algo_param *auth_hmacs = NULL;
+       struct sctp_chunks_param *auth_chunks = NULL;
+       struct sctp_shared_key *null_key;
+       int err;
+
        memset(ep, 0, sizeof(struct sctp_endpoint));
 
        ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
        if (!ep->digest)
                return NULL;
 
+       if (sctp_auth_enable) {
+               /* Allocate space for HMACS and CHUNKS authentication
+                * variables.  There are arrays that we encode directly
+                * into parameters to make the rest of the operations easier.
+                */
+               auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
+                               sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
+               if (!auth_hmacs)
+                       goto nomem;
+
+               auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
+                                       SCTP_NUM_CHUNK_TYPES, gfp);
+               if (!auth_chunks)
+                       goto nomem;
+
+               /* Initialize the HMACS parameter.
+                * SCTP-AUTH: Section 3.3
+                *    Every endpoint supporting SCTP chunk authentication MUST
+                *    support the HMAC based on the SHA-1 algorithm.
+                */
+               auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
+               auth_hmacs->param_hdr.length =
+                                       htons(sizeof(sctp_paramhdr_t) + 2);
+               auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
+
+               /* Initialize the CHUNKS parameter */
+               auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
+
+               /* If the Add-IP functionality is enabled, we must
+                * authenticate, ASCONF and ASCONF-ACK chunks
+                */
+               if (sctp_addip_enable) {
+                       auth_chunks->chunks[0] = SCTP_CID_ASCONF;
+                       auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
+                       auth_chunks->param_hdr.length =
+                                       htons(sizeof(sctp_paramhdr_t) + 2);
+               }
+       }
+
        /* Initialize the base structure. */
        /* What type of endpoint are we?  */
        ep->base.type = SCTP_EP_TYPE_SOCKET;
@@ -114,7 +158,36 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
        ep->last_key = ep->current_key = 0;
        ep->key_changed_at = jiffies;
 
+       /* SCTP-AUTH extensions*/
+       INIT_LIST_HEAD(&ep->endpoint_shared_keys);
+       null_key = sctp_auth_shkey_create(0, GFP_KERNEL);
+       if (!null_key)
+               goto nomem;
+
+       list_add(&null_key->key_list, &ep->endpoint_shared_keys);
+
+       /* Allocate and initialize transorms arrays for suported HMACs. */
+       err = sctp_auth_init_hmacs(ep, gfp);
+       if (err)
+               goto nomem_hmacs;
+
+       /* Add the null key to the endpoint shared keys list and
+        * set the hmcas and chunks pointers.
+        */
+       ep->auth_hmacs_list = auth_hmacs;
+       ep->auth_chunk_list = auth_chunks;
+
        return ep;
+
+nomem_hmacs:
+       sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
+nomem:
+       /* Free all allocations */
+       kfree(auth_hmacs);
+       kfree(auth_chunks);
+       kfree(ep->digest);
+       return NULL;
+
 }
 
 /* Create a sctp_endpoint with all that boring stuff initialized.
@@ -187,6 +260,16 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
        /* Free the digest buffer */
        kfree(ep->digest);
 
+       /* SCTP-AUTH: Free up AUTH releated data such as shared keys
+        * chunks and hmacs arrays that were allocated
+        */
+       sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
+       kfree(ep->auth_hmacs_list);
+       kfree(ep->auth_chunk_list);
+
+       /* AUTH - Free any allocated HMAC transform containers */
+       sctp_auth_destroy_hmacs(ep->auth_hmacs);
+
        /* Cleanup. */
        sctp_inq_free(&ep->base.inqueue);
        sctp_bind_addr_free(&ep->base.bind_addr);