netdev - [PATCH net-next] sctp: move 198 addresses from unusable to private scope

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Date:   Tue, 29 Jun 2021 23:34:08 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        linux-sctp@...r.kernel.org
Subject: [PATCH net-next] sctp: move 198 addresses from unusable to private scope

The doc draft-stewart-tsvwg-sctp-ipv4-00 that restricts 198 addresses
was never published. These addresses as private addresses should be
allowed to use in SCTP.

As Michael Tuexen suggested, this patch is to move 198 addresses from
unusable to private scope.

Reported-by: Sérgio <surkamp@...il.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/net/sctp/constants.h | 4 +---
 net/sctp/protocol.c          | 3 ++-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 265fffa33dad..5859e0a16a58 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -360,8 +360,7 @@ enum {
 #define SCTP_SCOPE_POLICY_MAX	SCTP_SCOPE_POLICY_LINK
 
 /* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
- * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
- * 192.88.99.0/24.
+ * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 192.88.99.0/24.
  * Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
  * addresses.
  */
@@ -369,7 +368,6 @@ enum {
 	((htonl(INADDR_BROADCAST) == a) ||  \
 	 ipv4_is_multicast(a) ||	    \
 	 ipv4_is_zeronet(a) ||		    \
-	 ipv4_is_test_198(a) ||		    \
 	 ipv4_is_anycast_6to4(a))
 
 /* Flags used for the bind address copy functions.  */
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index bc5db0b404ce..3ab1a2db1ff2 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -393,7 +393,8 @@ static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
 		retval = SCTP_SCOPE_LINK;
 	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 		   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
-		   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
+		   ipv4_is_private_192(addr->v4.sin_addr.s_addr) ||
+		   ipv4_is_test_198(addr->v4.sin_addr.s_addr)) {
 		retval = SCTP_SCOPE_PRIVATE;
 	} else {
 		retval = SCTP_SCOPE_GLOBAL;
-- 
2.27.0