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-rw-r--r--net/xfrm/xfrm_input.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 4c803f7e74e..b980095be93 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -9,6 +9,8 @@
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
@@ -94,6 +96,117 @@ int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
}
EXPORT_SYMBOL(xfrm_prepare_input);
+int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
+{
+ int err;
+ __be32 seq;
+ struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
+ struct xfrm_state *x;
+ int xfrm_nr = 0;
+ int decaps = 0;
+ unsigned int nhoff = XFRM_SPI_SKB_CB(skb)->nhoff;
+ unsigned int daddroff = XFRM_SPI_SKB_CB(skb)->daddroff;
+
+ seq = 0;
+ if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
+ goto drop;
+
+ do {
+ if (xfrm_nr == XFRM_MAX_DEPTH)
+ goto drop;
+
+ x = xfrm_state_lookup((xfrm_address_t *)
+ (skb_network_header(skb) + daddroff),
+ spi, nexthdr, AF_INET);
+ if (x == NULL)
+ goto drop;
+
+ spin_lock(&x->lock);
+ if (unlikely(x->km.state != XFRM_STATE_VALID))
+ goto drop_unlock;
+
+ if ((x->encap ? x->encap->encap_type : 0) != encap_type)
+ goto drop_unlock;
+
+ if (x->props.replay_window && xfrm_replay_check(x, seq))
+ goto drop_unlock;
+
+ if (xfrm_state_check_expire(x))
+ goto drop_unlock;
+
+ nexthdr = x->type->input(x, skb);
+ if (nexthdr <= 0)
+ goto drop_unlock;
+
+ skb_network_header(skb)[nhoff] = nexthdr;
+
+ /* only the first xfrm gets the encap type */
+ encap_type = 0;
+
+ if (x->props.replay_window)
+ xfrm_replay_advance(x, seq);
+
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ spin_unlock(&x->lock);
+
+ xfrm_vec[xfrm_nr++] = x;
+
+ if (x->inner_mode->input(x, skb))
+ goto drop;
+
+ if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
+ decaps = 1;
+ break;
+ }
+
+ err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
+ if (err < 0)
+ goto drop;
+ } while (!err);
+
+ /* Allocate new secpath or COW existing one. */
+
+ if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
+ struct sec_path *sp;
+ sp = secpath_dup(skb->sp);
+ if (!sp)
+ goto drop;
+ if (skb->sp)
+ secpath_put(skb->sp);
+ skb->sp = sp;
+ }
+ if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
+ goto drop;
+
+ memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
+ xfrm_nr * sizeof(xfrm_vec[0]));
+ skb->sp->len += xfrm_nr;
+
+ nf_reset(skb);
+
+ if (decaps) {
+ dst_release(skb->dst);
+ skb->dst = NULL;
+ netif_rx(skb);
+ return 0;
+ } else {
+ return x->inner_mode->afinfo->transport_finish(skb, 0);
+ }
+
+drop_unlock:
+ spin_unlock(&x->lock);
+ xfrm_state_put(x);
+drop:
+ while (--xfrm_nr >= 0)
+ xfrm_state_put(xfrm_vec[xfrm_nr]);
+
+ kfree_skb(skb);
+ return 0;
+}
+EXPORT_SYMBOL(xfrm_input);
+
void __init xfrm_input_init(void)
{
secpath_cachep = kmem_cache_create("secpath_cache",