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");
+}