netdev - Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on debian buster

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Date:   Wed, 8 Jan 2020 15:06:43 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     David Ahern <dsahern@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: commit b9ef5513c99b breaks ping to ipv6 linklocal addresses on
 debian buster

This version should work, I think. Please verify. Thank you.

----
 security/smack/smack_lsm.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 50c536cad85b..75b3953212e2 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2857,10 +2857,13 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
 		rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
 		break;
 	case PF_INET6:
-		if (addrlen < SIN6_LEN_RFC2133 || sap->sa_family != AF_INET6)
-			return -EINVAL;
+		if (addrlen < SIN6_LEN_RFC2133)
+			return 0;
 #ifdef SMACK_IPV6_SECMARK_LABELING
-		rsp = smack_ipv6host_label(sip);
+		if (sap->sa_family != AF_INET6)
+			rsp = NULL;
+		else
+			rsp = smack_ipv6host_label(sip);
 		if (rsp != NULL)
 			rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
 						SMK_CONNECTING);
@@ -3694,11 +3697,13 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
 		break;
 #if IS_ENABLED(CONFIG_IPV6)
 	case AF_INET6:
-		if (msg->msg_namelen < SIN6_LEN_RFC2133 ||
-		    sap->sin6_family != AF_INET6)
-			return -EINVAL;
+		if (msg->msg_namelen < SIN6_LEN_RFC2133)
+			return 0;
 #ifdef SMACK_IPV6_SECMARK_LABELING
-		rsp = smack_ipv6host_label(sap);
+		if (sap->sin6_family != AF_INET6)
+			rsp = NULL;
+		else
+			rsp = smack_ipv6host_label(sap);
 		if (rsp != NULL)
 			rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
 						SMK_CONNECTING);