netdev - [PATCH net] sctp: get pr_assoc and pr_stream all status with SCTP_PR_SCTP

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Message-Id: <e1b1741db983e1775312816bc2e6f0f685f9828d.1539676322.git.lucien.xin@gmail.com>
Date:   Tue, 16 Oct 2018 15:52:02 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: [PATCH net] sctp: get pr_assoc and pr_stream all status with SCTP_PR_SCTP_ALL instead

According to rfc7496 section 4.3 or 4.4:

   sprstat_policy:  This parameter indicates for which PR-SCTP policy
      the user wants the information.  It is an error to use
      SCTP_PR_SCTP_NONE in sprstat_policy.  If SCTP_PR_SCTP_ALL is used,
      the counters provided are aggregated over all supported policies.

We change to dump pr_assoc and pr_stream all status by SCTP_PR_SCTP_ALL
instead, and return error for SCTP_PR_SCTP_NONE, as it also said "It is
an error to use SCTP_PR_SCTP_NONE in sprstat_policy. "

Fixes: 826d253d57b1 ("sctp: add SCTP_PR_ASSOC_STATUS on sctp sockopt")
Fixes: d229d48d183f ("sctp: add SCTP_PR_STREAM_STATUS sockopt for prsctp")
Reported-by: Ying Xu <yinxu@...hat.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/uapi/linux/sctp.h | 1 +
 net/sctp/socket.c         | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index b479db5..34dd3d4 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -301,6 +301,7 @@ enum sctp_sinfo_flags {
 	SCTP_SACK_IMMEDIATELY	= (1 << 3), /* SACK should be sent without delay. */
 	/* 2 bits here have been used by SCTP_PR_SCTP_MASK */
 	SCTP_SENDALL		= (1 << 6),
+	SCTP_PR_SCTP_ALL	= (1 << 7),
 	SCTP_NOTIFICATION	= MSG_NOTIFICATION, /* Next message is not user msg but notification. */
 	SCTP_EOF		= MSG_FIN,  /* Initiate graceful shutdown process. */
 };
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index f73e9d3..e25a20f 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7100,14 +7100,14 @@ static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
 	}
 
 	policy = params.sprstat_policy;
-	if (policy & ~SCTP_PR_SCTP_MASK)
+	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)))
 		goto out;
 
 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
 	if (!asoc)
 		goto out;
 
-	if (policy == SCTP_PR_SCTP_NONE) {
+	if (policy & SCTP_PR_SCTP_ALL) {
 		params.sprstat_abandoned_unsent = 0;
 		params.sprstat_abandoned_sent = 0;
 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
@@ -7159,7 +7159,7 @@ static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
 	}
 
 	policy = params.sprstat_policy;
-	if (policy & ~SCTP_PR_SCTP_MASK)
+	if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)))
 		goto out;
 
 	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
@@ -7175,7 +7175,7 @@ static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
 		goto out;
 	}
 
-	if (policy == SCTP_PR_SCTP_NONE) {
+	if (policy == SCTP_PR_SCTP_ALL) {
 		params.sprstat_abandoned_unsent = 0;
 		params.sprstat_abandoned_sent = 0;
 		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
-- 
2.1.0