[MLSXFRM]: Add security context to acquire messages using netlink

This includes the security context of a security association created
for use by IKE in the acquire messages sent to IKE daemons using
netlink/xfrm_user. This would allow the daemons to include the
security context in the negotiation, so that the resultant association
is unique to that security context.

Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 15 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index fa79ddc4239e..dac8db1088bc 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -911,25 +911,38 @@ rtattr_failure:
         return -1;
 }
 
-static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
 {
-        if (xp->security) {
-                int ctx_size = sizeof(struct xfrm_sec_ctx) +
-                                xp->security->ctx_len;
-                struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
-                struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+        int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
+        struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+        struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+        uctx->exttype = XFRMA_SEC_CTX;
+        uctx->len = ctx_size;
+        uctx->ctx_doi = s->ctx_doi;
+        uctx->ctx_alg = s->ctx_alg;
+        uctx->ctx_len = s->ctx_len;
+        memcpy(uctx + 1, s->ctx_str, s->ctx_len);
+        return 0;
 
-                uctx->exttype = XFRMA_SEC_CTX;
-                uctx->len = ctx_size;
-                uctx->ctx_doi = xp->security->ctx_doi;
-                uctx->ctx_alg = xp->security->ctx_alg;
-                uctx->ctx_len = xp->security->ctx_len;
-                memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
+ rtattr_failure:
+        return -1;
+}
+
+static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
+{
+        if (x->security) {
+                return copy_sec_ctx(x->security, skb);
         }
         return 0;
+}
 
- rtattr_failure:
-        return -1;
+static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+        if (xp->security) {
+                return copy_sec_ctx(xp->security, skb);
+        }
+        return 0;
 }
 
 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
@@ -1710,7 +1723,7 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
 
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
-        if (copy_to_user_sec_ctx(xp, skb))
+        if (copy_to_user_state_sec_ctx(x, skb))
                 goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;