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authorGeir Ola Vaagland <geirola@gmail.com>2014-07-12 20:30:39 +0200
committerDavid S. Miller <davem@davemloft.net>2014-07-16 14:40:04 -0700
commit6b3fd5f3a2bbc8464a8e0bf134a183b8fa026439 (patch)
tree0c8fbc13226cbaa0e21401b0d1d438c6764d45f2 /net/sctp
parent2347c80ff127b94ddaa675e2b78ab4cef46dc905 (diff)
net: sctp: implement rfc6458, 8.1.31. SCTP_DEFAULT_SNDINFO support
This patch implements section 8.1.31. of RFC6458, which adds support for setting/retrieving 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. Joint work with Daniel Borkmann. Signed-off-by: Geir Ola Vaagland <geirola@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/socket.c107
1 files changed, 98 insertions, 9 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9bca87ee5152..d95a50c013c9 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2770,19 +2770,22 @@ static int sctp_setsockopt_default_send_param(struct sock *sk,
char __user *optval,
unsigned int optlen)
{
- struct sctp_sndrcvinfo info;
- struct sctp_association *asoc;
struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ struct sctp_sndrcvinfo info;
- if (optlen != sizeof(struct sctp_sndrcvinfo))
+ if (optlen != sizeof(info))
return -EINVAL;
if (copy_from_user(&info, optval, optlen))
return -EFAULT;
+ if (info.sinfo_flags &
+ ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+ SCTP_ABORT | SCTP_EOF))
+ return -EINVAL;
asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
return -EINVAL;
-
if (asoc) {
asoc->default_stream = info.sinfo_stream;
asoc->default_flags = info.sinfo_flags;
@@ -2800,6 +2803,44 @@ static int sctp_setsockopt_default_send_param(struct sock *sk,
return 0;
}
+/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
+ * (SCTP_DEFAULT_SNDINFO)
+ */
+static int sctp_setsockopt_default_sndinfo(struct sock *sk,
+ char __user *optval,
+ unsigned int optlen)
+{
+ struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ struct sctp_sndinfo info;
+
+ if (optlen != sizeof(info))
+ return -EINVAL;
+ if (copy_from_user(&info, optval, optlen))
+ return -EFAULT;
+ if (info.snd_flags &
+ ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+ SCTP_ABORT | SCTP_EOF))
+ return -EINVAL;
+
+ asoc = sctp_id2assoc(sk, info.snd_assoc_id);
+ if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
+ return -EINVAL;
+ 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)
*
* Requests that the local SCTP stack use the enclosed peer address as
@@ -3725,6 +3766,9 @@ 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;
@@ -5027,14 +5071,14 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
int len, char __user *optval,
int __user *optlen)
{
- struct sctp_sndrcvinfo info;
- struct sctp_association *asoc;
struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ struct sctp_sndrcvinfo info;
- if (len < sizeof(struct sctp_sndrcvinfo))
+ if (len < sizeof(info))
return -EINVAL;
- len = sizeof(struct sctp_sndrcvinfo);
+ len = sizeof(info);
if (copy_from_user(&info, optval, len))
return -EFAULT;
@@ -5042,7 +5086,6 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
return -EINVAL;
-
if (asoc) {
info.sinfo_stream = asoc->default_stream;
info.sinfo_flags = asoc->default_flags;
@@ -5065,6 +5108,48 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
return 0;
}
+/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
+ * (SCTP_DEFAULT_SNDINFO)
+ */
+static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
+ char __user *optval,
+ int __user *optlen)
+{
+ struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ struct sctp_sndinfo info;
+
+ if (len < sizeof(info))
+ return -EINVAL;
+
+ len = sizeof(info);
+
+ 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;
+}
+
/*
*
* 7.1.5 SCTP_NODELAY
@@ -5924,6 +6009,10 @@ 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;