CC: Vlad Yasevich <vyasevich@xxxxxxxxx>
Signed-off-by: Geir Ola Vaagland <geirola@xxxxxxxxx>
---
include/uapi/linux/sctp.h | 1 +
net/sctp/socket.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+)
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 986563e..133df4e 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -99,6 +99,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_RECVRCVINFO 32
#define SCTP_RECVNXTINFO 33
+#define SCTP_DEFAULT_SNDINFO 34
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 57106e8..a725376 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2801,6 +2801,55 @@ static int sctp_setsockopt_default_send_param(struct sock *sk,
return 0;
}
+
+/* 8.1.31. Set Default Send Parameters (SCTP_DEFAULT_SNDINFO)
+ *
+ * Applications that wish to use the sendto() system call may wish to
+ * specify a default set of parameters that would normally be supplied
+ * through the inclusion of ancillary data. This socket option allows
+ * such an application to set the default sctp_sndinfo structure. The
+ * application that wishes to use this socket option simply passes the
+ * sctp_sndinfo structure (defined in Section 5.3.4) to this call. The
+ * input parameters accepted by this call include snd_sid, snd_flags,
+ * snd_ppid, and snd_context. The snd_flags parameter is composed of a
+ * bitwise OR of SCTP_UNORDERED, SCTP_EOF, and SCTP_SENDALL. The
+ * snd_assoc_id field specifies the association to which to apply the
+ * parameters. For a one-to-many style socket, any of the predefined
+ * constants are also allowed in this field. The field is ignored for
+ * one-to-one style sockets.
+ */
+static int sctp_setsockopt_default_sndinfo(struct sock *sk,
+ char __user *optval,
+ unsigned int optlen){
+ struct sctp_sndinfo info;
+ struct sctp_association *asoc;
+ struct sctp_sock *sp = sctp_sk(sk);
+
+ if (optlen != sizeof(struct sctp_sndinfo))
+ return -EINVAL;
+ if (copy_from_user(&info, optval, optlen))
+ return -EFAULT;
+
+ asoc = sctp_id2assoc(sk, info.snd_assoc_id);
+ if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
+ return -EINVAL;
+
+ /* Note! asoc->default_timetolive is not set in this way anymore.
+ * The PR-SCTP extension needs to be implemented.
+ */
+ if (asoc) {
+ asoc->default_stream = info.snd_sid;
+ asoc->default_flags = info.snd_flags;
+ asoc->default_ppid = info.snd_ppid;
+ asoc->default_context = info.snd_context;
+ } else {
+ sp->default_stream = info.snd_sid;
+ sp->default_flags = info.snd_flags;
+ sp->default_ppid = info.snd_ppid;
+ sp->default_context = info.snd_context;
+ }
+ return 0;
+}
+
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
*
@@ -3724,6 +3773,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
retval = sctp_setsockopt_default_send_param(sk, optval,
optlen);
break;
+ case SCTP_DEFAULT_SNDINFO:
+ retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
+ break;
case SCTP_PRIMARY_ADDR:
retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
break;
@@ -5063,6 +5115,45 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
return 0;
}
+static int sctp_getsockopt_default_sndinfo(struct sock *sk,
+ int len, char __user *optval,
+ int __user *optlen)
+{
+ struct sctp_sndinfo info;
+ struct sctp_association *asoc;
+ struct sctp_sock *sp = sctp_sk(sk);
+
+ if (len < sizeof(struct sctp_sndinfo))
+ return -EINVAL;
+
+ len = sizeof(struct sctp_sndinfo);
+
+ if (copy_from_user(&info, optval, len))
+ return -EFAULT;
+
+ asoc = sctp_id2assoc(sk, info.snd_assoc_id);
+ if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
+ return -EINVAL;
+
+ if (asoc) {
+ info.snd_sid = asoc->default_stream;
+ info.snd_flags = asoc->default_flags;
+ info.snd_ppid = asoc->default_ppid;
+ info.snd_context = asoc->default_context;
+ } else {
+ info.snd_sid = sp->default_stream;
+ info.snd_flags = sp->default_flags;
+ info.snd_ppid = sp->default_ppid;
+ info.snd_context = sp->default_context;
+ }
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &info, len))
+ return -EFAULT;
+
+ return 0;
+}
/*
*
@@ -5917,6 +6008,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_default_send_param(sk, len,
optval, optlen);
break;
+ case SCTP_DEFAULT_SNDINFO:
+ retval = sctp_getsockopt_default_sndinfo(sk, len,
+ optval, optlen);
+ break;
case SCTP_PRIMARY_ADDR:
retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
break;
--
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