diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-11-20 05:50:17 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-29 01:53:54 +0300 |
| commit | 1bf06cd2e338fd6fc29169d30eaf0df982338285 (patch) | |
| tree | 351bf1c8e5063fdfb8c820470972169d398729fe /net/xfrm/xfrm_input.c | |
| parent | 60d5fcfb19d8a958fc563e52240cd05ec23f36c9 (diff) | |
| download | linux-1bf06cd2e338fd6fc29169d30eaf0df982338285.tar.xz | |
[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: 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.c | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index cce9d4586045..96f42c1d2e8e 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -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 @@ drop: } 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", |