[PATCH 5/7] secid reconciliation-v02: Label locally generated IPv6 traffic

[Venkat Yekkirala <vyekkirala@trustedcs.com>]

This labels the skb(s) for locally generated IPv6 traffic. This will
be reconciled with xfrm secid as well as used in pertinent flow control
checks on the outbound later in the LSM hook.

NOTE: Forwarded traffic is already labeled with the reconciled
secmark on the inbound.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
---
 include/linux/skbuff.h           |   29 +++++++++++++++++++++++++++++
 net/ipv6/ip6_output.c            |    5 +++++
 net/ipv6/netfilter/ip6t_REJECT.c |    2 ++
 3 files changed, 36 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 85577a4..18967f2 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -29,6 +29,7 @@ #include <linux/net.h>
 #include <linux/textsearch.h>
 #include <net/checksum.h>
 #include <linux/dmaengine.h>
+#include <net/flow.h>
 
 #define HAVE_ALLOC_SKB		/* For the drivers to know */
 #define HAVE_ALIGNABLE_SKB	/* Ditto 8)		   */
@@ -1499,5 +1500,33 @@ static inline int skb_is_gso(const struc
 	return skb_shinfo(skb)->gso_size;
 }
 
+#ifdef CONFIG_SECURITY_NETWORK
+
+static inline void security_skb_classify_skb(struct sk_buff *from,
+					struct sk_buff *skb)
+{
+	skb->secmark = from->secmark;
+}
+
+static inline void security_flow_classify_skb(struct flowi *fl,
+					struct sk_buff *skb)
+{
+	skb->secmark = fl->secid;
+}
+
+#else
+
+static inline void security_skb_classify_skb(struct sk_buff *from,
+					struct sk_buff *skb)
+{
+}
+
+static inline void security_flow_classify_skb(struct flowi *fl,
+					struct sk_buff *skb)
+{
+}
+
+#endif /* CONFIG_SECURITY_NETWORK */
+
 #endif	/* __KERNEL__ */
 #endif	/* _LINUX_SKBUFF_H */
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index c14ea1e..753e3b4 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -170,6 +170,8 @@ int ip6_xmit(struct sock *sk, struct sk_
 	int hlimit, tclass;
 	u32 mtu;
 
+	security_flow_classify_skb(fl, skb);
+
 	if (opt) {
 		int head_room;
 
@@ -1088,6 +1090,9 @@ alloc_new_skb:
 			}
 			if (skb == NULL)
 				goto error;
+
+			security_flow_classify_skb(fl, skb);
+
 			/*
 			 *	Fill in the control structures
 			 */
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 311eae8..0508c30 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -128,6 +128,8 @@ static void send_reset(struct sk_buff *o
 	ipv6_addr_copy(&ip6h->saddr, &oip6h->daddr);
 	ipv6_addr_copy(&ip6h->daddr, &oip6h->saddr);
 
+	security_skb_classify_skb(oldskb, nskb);
+
 	tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
 	/* Truncate to length (no data) */
 	tcph->doff = sizeof(struct tcphdr)/4;