netdev - [PATCH net-next 15/27] sctp: add rfc6525 section 5.1.4 and 6.3.3

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Date:   Sun,  1 Jan 2017 19:20:32 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: [PATCH net-next 15/27] sctp: add rfc6525 section 5.1.4 and 6.3.3

This patch is to implement Sender-Side Procedures for the SSN/TSN
Reset Request Parameter descibed in section 5.1.4.

It is also to add sockopt SCTP_RESET_ASSOC in section 6.3.3 for
users.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/uapi/linux/sctp.h |  1 +
 net/sctp/socket.c         | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 1f4518b..c1c77c8 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -118,6 +118,7 @@ typedef __s32 sctp_assoc_t;
 #define SCTP_RECONFIG_SUPPORTED	117
 #define SCTP_ENABLE_STREAM_RESET	118
 #define SCTP_RESET_STREAMS	119
+#define SCTP_RESET_ASSOC	120
 
 /* PR-SCTP policies */
 #define SCTP_PR_SCTP_NONE	0x0000
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e62872c..bcefc55 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3914,6 +3914,60 @@ static int sctp_setsockopt_reset_streams(struct sock *sk,
 	return retval;
 }
 
+static int sctp_setsockopt_reset_assoc(struct sock *sk,
+				       char __user *optval,
+				       unsigned int optlen)
+{
+	struct sctp_association *asoc;
+	struct sctp_chunk *chunk = NULL;
+	sctp_assoc_t associd;
+	int retval = -EINVAL;
+	__u16 i;
+
+	if (optlen != sizeof(associd))
+		goto out;
+
+	if (copy_from_user(&associd, optval, optlen)) {
+		retval = -EFAULT;
+		goto out;
+	}
+
+	asoc = sctp_id2assoc(sk, associd);
+	if (!asoc)
+		goto out;
+
+	if (!asoc->peer.reconf_capable ||
+	    !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) {
+		retval = -ENOPROTOOPT;
+		goto out;
+	}
+
+	if (asoc->strreset_outstanding) {
+		retval = -EINPROGRESS;
+		goto out;
+	}
+
+	chunk = sctp_make_strreset_tsnreq(asoc);
+	if (!chunk)
+		goto out;
+
+	for (i = 0; i < asoc->streamoutcnt; i++)
+		asoc->streamout[i].state = SCTP_STREAM_CLOSED;
+
+	asoc->strreset_outstanding = 1;
+	asoc->strreset_chunk = chunk;
+	sctp_chunk_hold(asoc->strreset_chunk);
+
+	retval = sctp_send_reconf(asoc, chunk);
+	if (retval) {
+		sctp_chunk_put(asoc->strreset_chunk);
+		asoc->strreset_chunk = NULL;
+	}
+
+out:
+	return retval;
+}
+
 /* API 6.2 setsockopt(), getsockopt()
  *
  * Applications use setsockopt() and getsockopt() to set or retrieve
@@ -4089,6 +4143,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
 	case SCTP_RESET_STREAMS:
 		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
 		break;
+	case SCTP_RESET_ASSOC:
+		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
+		break;
 	default:
 		retval = -ENOPROTOOPT;
 		break;
-- 
2.1.0