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Commit 1bf06cd2 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[IPSEC]: Add async resume support on input 



This patch adds support for async resumptions on input.  To do so, the
transform would return -EINPROGRESS and subsequently invoke the
function xfrm_input_resume to resume processing.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 60d5fcfb

include/net/xfrm.h

+1 −0
Original line number Diff line number Diff line
@@ -1138,6 +1138,7 @@ extern int xfrm_init_state(struct xfrm_state *x); 
extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);

extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,

		      int encap_type);

extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);

extern int xfrm_output_resume(struct sk_buff *skb, int err);

extern int xfrm_output(struct sk_buff *skb);

extern int xfrm4_extract_header(struct sk_buff *skb);

net/ipv4/xfrm4_input.c

+3 −0
Original line number Diff line number Diff line
@@ -59,6 +59,9 @@ int xfrm4_transport_finish(struct sk_buff *skb, int async) 
		xfrm4_rcv_encap_finish);

	return 0;

#else

	if (async)

		return xfrm4_rcv_encap_finish(skb);



	return -iph->protocol;

#endif

}

net/ipv6/xfrm6_input.c

+3 −0
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ int xfrm6_transport_finish(struct sk_buff *skb, int async) 
		ip6_rcv_finish);

	return -1;

#else

	if (async)

		return ip6_rcv_finish(skb);



	return 1;

#endif

}

net/xfrm/xfrm_input.c

+33 −5
Original line number Diff line number Diff line
@@ -101,8 +101,17 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
	int err;

	__be32 seq;

	struct xfrm_state *x;

	xfrm_address_t *daddr;

	int decaps = 0;

	unsigned int daddroff = XFRM_SPI_SKB_CB(skb)->daddroff;

	int async = 0;



	/* A negative encap_type indicates async resumption. */

	if (encap_type < 0) {

		async = 1;

		x = skb->sp->xvec[skb->sp->len - 1];

		seq = XFRM_SKB_CB(skb)->seq;

		goto resume;

	}



	/* Allocate new secpath or COW existing one. */

	if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
@@ -116,6 +125,9 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
		skb->sp = sp;

	}



	daddr = (xfrm_address_t *)(skb_network_header(skb) +

				   XFRM_SPI_SKB_CB(skb)->daddroff);



	seq = 0;

	if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)

		goto drop;
@@ -124,9 +136,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
		if (skb->sp->len == XFRM_MAX_DEPTH)

			goto drop;



		x = xfrm_state_lookup((xfrm_address_t *)

				      (skb_network_header(skb) + daddroff),

				      spi, nexthdr, AF_INET);

		x = xfrm_state_lookup(daddr, spi, nexthdr, AF_INET);

		if (x == NULL)

			goto drop;
@@ -147,8 +157,14 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 


		spin_unlock(&x->lock);



		XFRM_SKB_CB(skb)->seq = seq;



		nexthdr = x->type->input(x, skb);



		if (nexthdr == -EINPROGRESS)

			return 0;



resume:

		spin_lock(&x->lock);

		if (nexthdr <= 0) {

			if (nexthdr == -EBADMSG)
@@ -177,6 +193,12 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
			break;

		}



		/*

		 * We need the inner address.  However, we only get here for

		 * transport mode so the outer address is identical.

		 */

		daddr = &x->id.daddr;



		err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);

		if (err < 0)

			goto drop;
@@ -190,7 +212,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
		netif_rx(skb);

		return 0;

	} else {

		return x->inner_mode->afinfo->transport_finish(skb, 0);

		return x->inner_mode->afinfo->transport_finish(skb, async);

	}



drop_unlock:
@@ -201,6 +223,12 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) 
}

EXPORT_SYMBOL(xfrm_input);



int xfrm_input_resume(struct sk_buff *skb, int nexthdr)

{

	return xfrm_input(skb, nexthdr, 0, -1);

}

EXPORT_SYMBOL(xfrm_input_resume);



void __init xfrm_input_init(void)

{

	secpath_cachep = kmem_cache_create("secpath_cache",