[SCTP] Adaption layer indication support.

Add support for SCTP_ADAPTION_INDICATION notification, SCTP_ADAPTION_LAYER
socket option and SCTP_PARAM_ADAPTION_LAYER_IND parameter.
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>

include/linux/sctp.h

@@ -281,7 +281,11 @@ typedef struct sctp_ecn_capable_param {
 	sctp_paramhdr_t param_hdr;
 } __attribute__((packed)) sctp_ecn_capable_param_t;
 
-
+/* ADDIP Section 3.2.6 Adaption Layer Indication */
+typedef struct sctp_adaption_ind_param {
+	struct sctp_paramhdr param_hdr;
+	__u32 adaption_ind;
+} __attribute__((packed)) sctp_adaption_ind_param_t;
 
 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP

include/net/sctp/structs.h

@@ -266,6 +266,7 @@ struct sctp_opt {
 	__u8 disable_fragments;
 	__u8 pd_mode;
 	__u8 v4mapped;
+	__u32 adaption_ind;
 
 	/* Receive to here while partial delivery is in effect. */
 	struct sk_buff_head pd_lobby;
@@ -323,6 +324,8 @@ struct sctp_cookie {
 
 	__u8 prsctp_capable;
 
+	__u32 adaption_ind;	
+
 	/* This is a shim for my peer's INIT packet, followed by
 	 * a copy of the raw address list of the association.
 	 * The length of the raw address list is saved in the
@@ -362,6 +365,7 @@ union sctp_params {
 	struct sctp_ipv4addr_param *v4;
 	struct sctp_ipv6addr_param *v6;
 	union sctp_addr_param *addr;
+	struct sctp_adaption_ind_param *aind;
 };
 
 /* RFC 2960.  Section 3.3.5 Heartbeat.
@@ -1395,6 +1399,8 @@ struct sctp_association {
 		__u8    asconf_capable;  /* Does peer support ADDIP? */
 		__u8    prsctp_capable;  /* Can peer do PR-SCTP? */
 
+		__u32   adaption_ind;	 /* Adaption Code point. */
+
 		/* This mask is used to disable sending the ASCONF chunk
 		 * with specified parameter to peer.
 		 */

include/net/sctp/ulpevent.h

@@ -121,6 +121,9 @@ struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 	const struct sctp_association *asoc,
 	__u32 indication, int gfp);
 
+struct sctp_ulpevent *sctp_ulpevent_make_adaption_indication(
+	const struct sctp_association *asoc, int gfp);
+
 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 	struct sctp_chunk *chunk,
 	int gfp);

net/sctp/sm_make_chunk.c

@@ -171,6 +171,7 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
 	struct sctp_opt *sp;
 	sctp_supported_addrs_param_t sat;
 	__u16 types[2];
+	sctp_adaption_ind_param_t aiparam;
 
 	/* RFC 2960 3.3.2 Initiation (INIT) (1)
 	 *
@@ -196,6 +197,7 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
 	chunksize += sizeof(ecap_param);
 	if (sctp_prsctp_enable)
 		chunksize += sizeof(prsctp_param);
+	chunksize += sizeof(aiparam);
 	chunksize += vparam_len;
 
 	/* RFC 2960 3.3.2 Initiation (INIT) (1)
@@ -234,6 +236,10 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
 	sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
 	if (sctp_prsctp_enable)
 		sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
+	aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND;
+	aiparam.param_hdr.length = htons(sizeof(aiparam));
+	aiparam.adaption_ind = htonl(sp->adaption_ind);
+	sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
 nodata:
 	if (addrs.v)
 		kfree(addrs.v);
@@ -251,6 +257,7 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
 	sctp_cookie_param_t *cookie;
 	int cookie_len;
 	size_t chunksize;
+	sctp_adaption_ind_param_t aiparam;
 
 	retval = NULL;
 
@@ -284,6 +291,8 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
 	if (asoc->peer.prsctp_capable)
 		chunksize += sizeof(prsctp_param);
 
+	chunksize += sizeof(aiparam);
+
 	/* Now allocate and fill out the chunk.  */
 	retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
 	if (!retval)
@@ -302,6 +311,11 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
 	if (asoc->peer.prsctp_capable)
 		sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
 
+	aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND;
+	aiparam.param_hdr.length = htons(sizeof(aiparam));
+	aiparam.adaption_ind = htonl(sctp_sk(asoc->base.sk)->adaption_ind);
+	sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
+
 	/* We need to remove the const qualifier at this point.  */
 	retval->asoc = (struct sctp_association *) asoc;
 
@@ -1297,6 +1311,9 @@ sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
 	/* Remember PR-SCTP capability. */
 	cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
 
+	/* Save adaption indication in the cookie. */
+	cookie->c.adaption_ind = asoc->peer.adaption_ind;
+
 	/* Set an expiration time for the cookie.  */
 	do_gettimeofday(&cookie->c.expiration);
 	TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
@@ -1455,6 +1472,7 @@ struct sctp_association *sctp_unpack_cookie(
 	retval->addip_serial = retval->c.initial_tsn;
 	retval->adv_peer_ack_point = retval->ctsn_ack_point;
 	retval->peer.prsctp_capable = retval->c.prsctp_capable;
+	retval->peer.adaption_ind = retval->c.adaption_ind;
 
 	/* The INIT stuff will be done by the side effects.  */
 	return retval;
@@ -1661,6 +1679,7 @@ static int sctp_verify_param(const struct sctp_association *asoc,
 	case SCTP_PARAM_HEARTBEAT_INFO:
 	case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
 	case SCTP_PARAM_ECN_CAPABLE:
+	case SCTP_PARAM_ADAPTION_LAYER_IND:
 		break;
 
 	case SCTP_PARAM_HOST_NAME_ADDRESS:
@@ -1989,6 +2008,10 @@ int sctp_process_param(struct sctp_association *asoc, union sctp_params param,
 		asoc->peer.ecn_capable = 1;
 		break;
 
+	case SCTP_PARAM_ADAPTION_LAYER_IND:
+		asoc->peer.adaption_ind = param.aind->adaption_ind;
+		break;
+
 	case SCTP_PARAM_FWD_TSN_SUPPORT:
 		if (sctp_prsctp_enable) {
 			asoc->peer.prsctp_capable = 1;

net/sctp/sm_statefuns.c

@@ -629,6 +629,21 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
 
 	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 Adaption Layer Indication parameter , SCTP
+	 * delivers this notification to inform the application that of the
+	 * peers requested adaption layer.
+	 */
+	if (new_asoc->peer.adaption_ind) {
+		ev = sctp_ulpevent_make_adaption_indication(new_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:
@@ -713,6 +728,20 @@ sctp_disposition_t sctp_sf_do_5_1E_ca(const struct sctp_endpoint *ep,
 
 	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 Adaption Layer Indication parameter , SCTP
+	 * delivers this notification to inform the application that of the
+	 * peers requested adaption layer.
+	 */
+	if (asoc->peer.adaption_ind) {
+		ev = sctp_ulpevent_make_adaption_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;
@@ -1532,6 +1561,21 @@ static sctp_disposition_t sctp_sf_do_dupcook_b(const struct sctp_endpoint *ep,
 		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 Adaption Layer Indication parameter , SCTP
+	 * delivers this notification to inform the application that of the
+	 * peers requested adaption layer.
+	 */
+	if (asoc->peer.adaption_ind) {
+		ev = sctp_ulpevent_make_adaption_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:
@@ -1612,6 +1656,21 @@ static sctp_disposition_t sctp_sf_do_dupcook_d(const struct sctp_endpoint *ep,
 			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 Adaption Layer Indication parameter,
+		 * SCTP delivers this notification to inform the application
+		 * that of the peers requested adaption layer.
+		 */
+		if (new_asoc->peer.adaption_ind) {
+			ev = sctp_ulpevent_make_adaption_indication(new_asoc,
+								 GFP_ATOMIC);
+			if (!ev)
+				goto nomem;
+
+			sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
+					SCTP_ULPEVENT(ev));
+		}
 	}
 	sctp_add_cmd_sf(commands, SCTP_CMD_TRANSMIT, SCTP_NULL());
 

net/sctp/socket.c

@@ -2120,6 +2120,20 @@ static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optva
 	return err;
 }
 
+static int sctp_setsockopt_adaption_layer(struct sock *sk, char __user *optval,
+					  int optlen)
+{
+	__u32 val;
+
+	if (optlen < sizeof(__u32))
+		return -EINVAL;
+	if (copy_from_user(&val, optval, sizeof(__u32)))
+		return -EFAULT;
+
+	sctp_sk(sk)->adaption_ind = val;
+
+	return 0;
+}
 
 /* API 6.2 setsockopt(), getsockopt()
  *
@@ -2219,6 +2233,10 @@ SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
 	case SCTP_MAXSEG:
 		retval = sctp_setsockopt_maxseg(sk, optval, optlen);
 		break;
+	case SCTP_ADAPTION_LAYER:
+		retval = sctp_setsockopt_adaption_layer(sk, optval, optlen);
+		break;
+
 	default:
 		retval = -ENOPROTOOPT;
 		break;
@@ -2518,6 +2536,8 @@ SCTP_STATIC int sctp_init_sock(struct sock *sk)
 	/* User specified fragmentation limit. */
 	sp->user_frag         = 0;
 
+	sp->adaption_ind = 0;
+
 	sp->pf = sctp_get_pf_specific(sk->sk_family);
 
 	/* Control variables for partial data delivery. */
@@ -3159,6 +3179,29 @@ static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
 	return 0;
 }
 
+/*
+ * 7.1.11  Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
+ *
+ * Requests that the local endpoint set the specified Adaption Layer
+ * Indication parameter for all future INIT and INIT-ACK exchanges.
+ */
+static int sctp_getsockopt_adaption_layer(struct sock *sk, int len,
+				  char __user *optval, int __user *optlen)
+{
+	__u32 val;
+
+	if (len < sizeof(__u32))
+		return -EINVAL;
+
+	len = sizeof(__u32);
+	val = sctp_sk(sk)->adaption_ind;
+	if (put_user(len, optlen))
+		return -EFAULT;
+	if (copy_to_user(optval, &val, len))
+		return -EFAULT;
+	return 0;
+}
+
 /*
  *
  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
@@ -3515,6 +3558,10 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
 		retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
 							optlen);
 		break;
+	case SCTP_ADAPTION_LAYER:
+		retval = sctp_getsockopt_adaption_layer(sk, len, optval,
+							optlen);
+		break;
 	default:
 		retval = -ENOPROTOOPT;
 		break;

net/sctp/ulpevent.c

@@ -562,7 +562,7 @@ struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 	struct sctp_shutdown_event *sse;
 	struct sk_buff *skb;
 
-	event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
+	event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
 				  MSG_NOTIFICATION, gfp);
 	if (!event)
 		goto fail;
@@ -613,6 +613,40 @@ struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 	return NULL;
 }
 
+/* Create and initialize a SCTP_ADAPTION_INDICATION notification.
+ *
+ * Socket Extensions for SCTP
+ * 5.3.1.6 SCTP_ADAPTION_INDICATION
+ */
+struct sctp_ulpevent *sctp_ulpevent_make_adaption_indication(
+	const struct sctp_association *asoc, int gfp)
+{
+	struct sctp_ulpevent *event;
+	struct sctp_adaption_event *sai;
+	struct sk_buff *skb;
+
+	event = sctp_ulpevent_new(sizeof(struct sctp_adaption_event),
+				  MSG_NOTIFICATION, gfp);
+	if (!event)
+		goto fail;
+
+	skb = sctp_event2skb(event);
+	sai = (struct sctp_adaption_event *)
+		skb_put(skb, sizeof(struct sctp_adaption_event));
+
+	sai->sai_type = SCTP_ADAPTION_INDICATION;
+	sai->sai_flags = 0;
+	sai->sai_length = sizeof(struct sctp_adaption_event);
+	sai->sai_adaption_ind = asoc->peer.adaption_ind;
+	sctp_ulpevent_set_owner(event, asoc);
+	sai->sai_assoc_id = sctp_assoc2id(asoc);
+
+	return event;
+
+fail:
+	return NULL;
+}
+
 /* A message has been received.  Package this message as a notification
  * to pass it to the upper layers.  Go ahead and calculate the sndrcvinfo
  * even if filtered out later.
@@ -689,7 +723,7 @@ struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 	struct sctp_pdapi_event *pd;
 	struct sk_buff *skb;
 
-	event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
+	event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
 				  MSG_NOTIFICATION, gfp);
 	if (!event)
 		goto fail;