1 files changed, 89 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
new file mode 100644
index 000000000000..c58a6f05a0b6
--- /dev/null
+++ b/net/xfrm/xfrm_input.c
@@ -0,0 +1,89 @@
+/*
+ * xfrm_input.c
+ *
+ * Changes:
+ * 	YOSHIFUJI Hideaki @USAGI
+ * 		Split up af-specific portion
+ * 	
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+
+static kmem_cache_t *secpath_cachep;
+
+void __secpath_destroy(struct sec_path *sp)
+{
+	int i;
+	for (i = 0; i < sp->len; i++)
+		xfrm_state_put(sp->x[i].xvec);
+	kmem_cache_free(secpath_cachep, sp);
+}
+EXPORT_SYMBOL(__secpath_destroy);
+
+struct sec_path *secpath_dup(struct sec_path *src)
+{
+	struct sec_path *sp;
+
+	sp = kmem_cache_alloc(secpath_cachep, SLAB_ATOMIC);
+	if (!sp)
+		return NULL;
+
+	sp->len = 0;
+	if (src) {
+		int i;
+
+		memcpy(sp, src, sizeof(*sp));
+		for (i = 0; i < sp->len; i++)
+			xfrm_state_hold(sp->x[i].xvec);
+	}
+	atomic_set(&sp->refcnt, 1);
+	return sp;
+}
+EXPORT_SYMBOL(secpath_dup);
+
+/* Fetch spi and seq from ipsec header */
+
+int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq)
+{
+	int offset, offset_seq;
+
+	switch (nexthdr) {
+	case IPPROTO_AH:
+		offset = offsetof(struct ip_auth_hdr, spi);
+		offset_seq = offsetof(struct ip_auth_hdr, seq_no);
+		break;
+	case IPPROTO_ESP:
+		offset = offsetof(struct ip_esp_hdr, spi);
+		offset_seq = offsetof(struct ip_esp_hdr, seq_no);
+		break;
+	case IPPROTO_COMP:
+		if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
+			return -EINVAL;
+		*spi = ntohl(ntohs(*(u16*)(skb->h.raw + 2)));
+		*seq = 0;
+		return 0;
+	default:
+		return 1;
+	}
+
+	if (!pskb_may_pull(skb, 16))
+		return -EINVAL;
+
+	*spi = *(u32*)(skb->h.raw + offset);
+	*seq = *(u32*)(skb->h.raw + offset_seq);
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_parse_spi);
+
+void __init xfrm_input_init(void)
+{
+	secpath_cachep = kmem_cache_create("secpath_cache",
+					   sizeof(struct sec_path),
+					   0, SLAB_HWCACHE_ALIGN,
+					   NULL, NULL);
+	if (!secpath_cachep)
+		panic("XFRM: failed to allocate secpath_cache\n");
+}