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authorHerbert Xu <herbert@gondor.apana.org.au>2007-11-13 21:44:23 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:53:50 -0800
commit716062fd4c2f88a33ab409f62a1e7397ad0a7e33 (patch)
tree73f2618fe99bca3870a0dbdc35acf6466ab3b976 /net/xfrm/xfrm_input.c
parentc6581a457e661b7070e484ad723bbf555b17aca2 (diff)
[IPSEC]: Merge most of the input path
As part of the work on asynchronous cryptographic operations, we need to be able to resume from the spot where they occur. As such, it helps if we isolate them to one spot. This patch moves most of the remaining family-specific processing into the common input code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm/xfrm_input.c')
-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",