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IPV6: Add sort functions to combine templates/states for IPsec.

PATCH In review Masahide NAKAMURA 1 participant 1 message Jul 29, 2006

Subsystems (3)
Networking Network drivers Networking IPsec
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Masahide NAKAMURA

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PATCH 23/23 IPV6: Add sort functions to combine templates/states for IPsec.

Add sort functions to combine templates/states for IPsec.
Think of outbound transformation order we should be careful with transport AH which must be the last of all transport ones.

---
 net/ipv6/xfrm6_state.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 101 insertions(+), 0 deletions(-)
net/ipv6/xfrm6_state.c +101 -0
index d141030..1a5cc65 100644
@@ -160,6 +160,103 @@ #endif
 	return x0;
 }
 
+#ifdef CONFIG_XFRM_SUB_POLICY
+static int
+__xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
+{
+	int i;
+	int j = 0;
+
+	/* Rule 1: select IPsec transport except AH */
+	for (i = 0; i < n; i++) {
+		if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
+		    src[i]->id.proto != IPPROTO_AH) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+	if (j == n)
+		goto end;
+
+	/* XXX: Rule 2: select MIPv6 RO or inbound trigger */
+
+	/* Rule 3: select IPsec transport AH */
+	for (i = 0; i < n; i++) {
+		if (src[i] &&
+		    src[i]->props.mode == XFRM_MODE_TRANSPORT &&
+		    src[i]->id.proto == IPPROTO_AH) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+	if (j == n)
+		goto end;
+
+	/* Rule 4: select IPsec tunnel */
+	for (i = 0; i < n; i++) {
+		if (src[i] &&
+		    src[i]->props.mode == XFRM_MODE_TUNNEL) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+	if (likely(j == n))
+		goto end;
+
+	/* Final rule */
+	for (i = 0; i < n; i++) {
+		if (src[i]) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+
+ end:
+	return 0;
+}
+
+static int
+__xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
+{
+	int i;
+	int j = 0;
+
+	/* Rule 1: select IPsec transport */
+	for (i = 0; i < n; i++) {
+		if (src[i]->mode == XFRM_MODE_TRANSPORT) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+	if (j == n)
+		goto end;
+
+	/* XXX: Rule 2: select MIPv6 RO or inbound trigger */
+
+	/* Rule 3: select IPsec tunnel */
+	for (i = 0; i < n; i++) {
+		if (src[i] &&
+		    src[i]->mode == XFRM_MODE_TUNNEL) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+	if (likely(j == n))
+		goto end;
+
+	/* Final rule */
+	for (i = 0; i < n; i++) {
+		if (src[i]) {
+			dst[j++] = src[i];
+			src[i] = NULL;
+		}
+	}
+
+ end:
+	return 0;
+}
+#endif
+
 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
 	.family			= AF_INET6,
 	.lock			= RW_LOCK_UNLOCKED,

@@ -169,6 +266,10 @@ #ifdef CONFIG_XFRM_ADVANCED
 	.state_lookup_byaddr	= __xfrm6_state_lookup_byaddr,
 #endif
 	.find_acq		= __xfrm6_find_acq,
+#ifdef CONFIG_XFRM_SUB_POLICY
+	.tmpl_sort		= __xfrm6_tmpl_sort,
+	.state_sort		= __xfrm6_state_sort,
+#endif
 };
 
 void __init xfrm6_state_init(void)
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