[MLSXFRM]: Auto-labeling of child sockets

This automatically labels the TCP, Unix stream, and dccp child sockets
as well as openreqs to be at the same MLS level as the peer. This will
result in the selection of appropriately labeled IPSec Security
Associations.

This also uses the sock's sid (as opposed to the isec sid) in SELinux
enforcement of secmark in rcv_skb and postroute_last hooks.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 2 deletions

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 386498053b1c..171d363876ee 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -501,6 +501,9 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 
         dccp_openreq_init(req, &dp, skb);
 
+        if (security_inet_conn_request(sk, skb, req))
+                goto drop_and_free;
+
         ireq = inet_rsk(req);
         ireq->loc_addr = daddr;
         ireq->rmt_addr = saddr;
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 53d255c01431..231bc7c7e749 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -424,7 +424,7 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
         fl.oif = ireq6->iif;
         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
         fl.fl_ip_sport = inet_sk(sk)->sport;
-        security_sk_classify_flow(sk, &fl);
+        security_req_classify_flow(req, &fl);
 
         if (dst == NULL) {
                 opt = np->opt;
@@ -626,7 +626,7 @@ static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
         fl.oif = inet6_iif(rxskb);
         fl.fl_ip_dport = dh->dccph_dport;
         fl.fl_ip_sport = dh->dccph_sport;
-        security_skb_classify_flow(rxskb, &fl);
+        security_req_classify_flow(req, &fl);
 
         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
@@ -709,6 +709,9 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 
         dccp_openreq_init(req, &dp, skb);
 
+        if (security_inet_conn_request(sk, skb, req))
+                goto drop_and_free;
+
         ireq6 = inet6_rsk(req);
         ireq = inet_rsk(req);
         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);