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Date: Tue, 17 Jun 2014 17:01:32 +0200
From: Geir Ola Vaagland <geirola@...il.com>
To: netdev@...r.kernel.org
Cc: linux-sctp@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>
Subject: [PATCH net-next 2/6] Support for SCTP_RCVINFO ancillary data
CC: Vlad Yasevich <vyasevich@...il.com>
Signed-off-by: Geir Ola Vaagland <geirola@...il.com>
---
include/net/sctp/ulpevent.h | 2 +
include/uapi/linux/sctp.h | 23 ++++++++++++
net/sctp/socket.c | 6 +++
net/sctp/ulpevent.c | 91 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 122 insertions(+)
diff --git a/include/net/sctp/ulpevent.h b/include/net/sctp/ulpevent.h
index 27b9f5c..2f42831 100644
--- a/include/net/sctp/ulpevent.h
+++ b/include/net/sctp/ulpevent.h
@@ -131,6 +131,8 @@ struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
struct msghdr *);
+void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
+ struct msghdr *);
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
/* Is this event type enabled? */
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index a7db3b3..7e8736b 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -158,6 +158,27 @@ struct sctp_sndrcvinfo {
};
/*
+ * 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
+ *
+ * This cmsghdr structure specifies SCTP options for sendmsg().
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ -------------------
+ * IPPROTO_SCTP SCTP_RCVINFO struct sctp_rcvinfo
+ *
+ */
+struct sctp_rcvinfo {
+ __u16 rcv_sid;
+ __u16 rcv_ssn;
+ __u16 rcv_flags;
+ __u32 rcv_ppid;
+ __u32 rcv_tsn;
+ __u32 rcv_cumtsn;
+ __u32 rcv_context;
+ sctp_assoc_t rcv_assoc_id;
+};
+
+/*
* sinfo_flags: 16 bits (unsigned integer)
*
* This field may contain any of the following flags and is composed of
@@ -184,6 +205,8 @@ typedef enum sctp_cmsg_type {
#define SCTP_INIT SCTP_INIT
SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */
#define SCTP_SNDRCV SCTP_SNDRCV
+ SCTP_RCVINFO,
+#define SCTP_RCVINFO SCTP_RCVINFO
} sctp_cmsg_t;
/*
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1f3281b..aee161b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2094,6 +2094,12 @@ static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
}
+
+ /* Check if SCTP_RCVINFO should be included */
+ if (sp->recvrcvinfo)
+ sctp_ulpevent_read_rcvinfo(event, msg);
+
+
/* Check if we allow SCTP_SNDRCVINFO. */
if (sp->subscribe.sctp_data_io_event)
sctp_ulpevent_read_sndrcvinfo(event, msg);
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index 81089ed..d1b9a02 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -900,6 +900,97 @@ __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
return notification->sn_header.sn_type;
}
+void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
+ struct msghdr *msghdr)
+{
+ struct sctp_rcvinfo rinfo;
+
+ memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
+
+ if (sctp_ulpevent_is_notification(event))
+ return;
+
+
+ /* Sockets API Extensions for SCTP
+ * Section 5.3.5 SCTP Receive Information Structure (SCTP_SNDRCV)
+ *
+ * rcv_sid: 16 bits (unsigned integer)
+ *
+ * The SCTP stack places the message's stream number in this
+ * value.
+ */
+ rinfo.rcv_sid = event->stream;
+
+ /* rcv_ssn: 16 bits (unsigned integer)
+ * This value contains the stream sequence number that the
+ * remote endpoint placed in the DATA chunk. For fragmented
+ * messages, this is the same number for all deliveries of the
+ * message (if more than one recvmsg() is needed to read
+ * the message)
+ */
+ rinfo.rcv_ssn = event->ssn;
+
+
+ /* rcv_ppid: 32 bits (unsigned integer)
+ *
+ * This value is the same information that was passed by the
+ * upper layer in the peer application. Please note that the SCTP
+ * stack performs no byte order modification of this field.
+ * For example, if the DATA chunk has to contain a given
+ * value in network byte order, the SCTP user has to perform the
+ * ntohl() computation.
+ */
+ rinfo.rcv_ppid = event->ppid;
+
+ /* rcv_flags: 16 bits (unsigned integer)
+ *
+ * This field may contain any of the following flags and is composed of
+ * a bitwise OR of these values.
+ *
+ * recvmsg() flags:
+ *
+ * SCTP_UNORDERED - This flag is present when the message was sent
+ * non-ordered.
+ */
+
+ rinfo.rcv_flags = event->flags;
+
+ /* rcv_tsn: 32 bits (unsigned integer)
+ *
+ * This field holds a TSN that was assigned to one of the SCTP
+ * DATA chunks.
+ */
+ rinfo.rcv_tsn = event->tsn;
+
+ /* rcv_cumtsn: 32 bits (unsigned integer)
+ *
+ * This field will hold the current cumulative TSN as known
+ * by the underlying SCTP layer.
+ */
+ rinfo.rcv_cumtsn = event->cumtsn;
+
+ /* rcv_assoc_id: sizeof (sctp_assoc_t)
+ *
+ * The association handle field, sinfo_assoc_id, holds the identifier
+ * for the association announced in the COMMUNICATION_UP notification.
+ * All notifications for a given association have the same identifier.
+ * Ignored for one-to-one style sockets.
+ */
+ rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
+
+ /* rcv_context: 32 bits (unsigned integer)
+ *
+ * This value is an opaque 32-bit context datum that was
+ * set by the user with the SCTP_CONTEXT socket option. This
+ * value is passed back to the upper layer if an error occurs on
+ * the send of a message and is retrieved with each undelivered
+ * message.
+ */
+ rinfo.rcv_context = event->asoc->default_rcv_context;
+
+ put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
+ sizeof(struct sctp_rcvinfo), (void *)&rinfo);
+}
+
+
/* Copy out the sndrcvinfo into a msghdr. */
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
struct msghdr *msghdr)
--
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