9 files changed, 415 insertions, 608 deletions

diff --git a/include/net/ipcomp.h b/include/net/ipcomp.h
index 330b74e813a9..2a1092abaa07 100644
--- a/include/net/ipcomp.h
+++ b/include/net/ipcomp.h
@@ -14,6 +14,12 @@ struct ipcomp_data {
 
 struct ip_comp_hdr;
 struct sk_buff;
+struct xfrm_state;
+
+int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb);
+int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb);
+void ipcomp_destroy(struct xfrm_state *x);
+int ipcomp_init_state(struct xfrm_state *x);
 
 static inline struct ip_comp_hdr *ip_comp_hdr(const struct sk_buff *skb)
 {
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 4670683b4688..591ea23639ca 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -356,10 +356,8 @@ config INET_ESP
 
 config INET_IPCOMP
         tristate "IP: IPComp transformation"
-        select XFRM
         select INET_XFRM_TUNNEL
-        select CRYPTO
-        select CRYPTO_DEFLATE
+        select XFRM_IPCOMP
         ---help---
           Support for IP Payload Compression Protocol (IPComp) (RFC3173),
           typically needed for IPsec.
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index a75807b971b3..a42b64d040c4 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -14,153 +14,14 @@
  *   - Adaptive compression.
  */
 #include <linux/module.h>
-#include <linux/crypto.h>
 #include <linux/err.h>
-#include <linux/pfkeyv2.h>
-#include <linux/percpu.h>
-#include <linux/smp.h>
-#include <linux/list.h>
-#include <linux/vmalloc.h>
 #include <linux/rtnetlink.h>
-#include <linux/mutex.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
 #include <net/icmp.h>
 #include <net/ipcomp.h>
 #include <net/protocol.h>
-
-struct ipcomp_tfms {
-        struct list_head list;
-        struct crypto_comp **tfms;
-        int users;
-};
-
-static DEFINE_MUTEX(ipcomp_resource_mutex);
-static void **ipcomp_scratches;
-static int ipcomp_scratch_users;
-static LIST_HEAD(ipcomp_tfms_list);
-
-static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb)
-{
-        struct ipcomp_data *ipcd = x->data;
-        const int plen = skb->len;
-        int dlen = IPCOMP_SCRATCH_SIZE;
-        const u8 *start = skb->data;
-        const int cpu = get_cpu();
-        u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-        struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-        int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
-
-        if (err)
-                goto out;
-
-        if (dlen < (plen + sizeof(struct ip_comp_hdr))) {
-                err = -EINVAL;
-                goto out;
-        }
-
-        err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
-        if (err)
-                goto out;
-
-        skb->truesize += dlen - plen;
-        __skb_put(skb, dlen - plen);
-        skb_copy_to_linear_data(skb, scratch, dlen);
-out:
-        put_cpu();
-        return err;
-}
-
-static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
-{
-        int nexthdr;
-        int err = -ENOMEM;
-        struct ip_comp_hdr *ipch;
-
-        if (skb_linearize_cow(skb))
-                goto out;
-
-        skb->ip_summed = CHECKSUM_NONE;
-
-        /* Remove ipcomp header and decompress original payload */
-        ipch = (void *)skb->data;
-        nexthdr = ipch->nexthdr;
-
-        skb->transport_header = skb->network_header + sizeof(*ipch);
-        __skb_pull(skb, sizeof(*ipch));
-        err = ipcomp_decompress(x, skb);
-        if (err)
-                goto out;
-
-        err = nexthdr;
-
-out:
-        return err;
-}
-
-static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
-{
-        struct ipcomp_data *ipcd = x->data;
-        const int plen = skb->len;
-        int dlen = IPCOMP_SCRATCH_SIZE;
-        u8 *start = skb->data;
-        const int cpu = get_cpu();
-        u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
-        struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
-        int err;
-
-        local_bh_disable();
-        err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
-        local_bh_enable();
-        if (err)
-                goto out;
-
-        if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) {
-                err = -EMSGSIZE;
-                goto out;
-        }
-
-        memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
-        put_cpu();
-
-        pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
-        return 0;
-
-out:
-        put_cpu();
-        return err;
-}
-
-static int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb)
-{
-        int err;
-        struct ip_comp_hdr *ipch;
-        struct ipcomp_data *ipcd = x->data;
-
-        if (skb->len < ipcd->threshold) {
-                /* Don't bother compressing */
-                goto out_ok;
-        }
-
-        if (skb_linearize_cow(skb))
-                goto out_ok;
-
-        err = ipcomp_compress(x, skb);
-
-        if (err) {
-                goto out_ok;
-        }
-
-        /* Install ipcomp header, convert into ipcomp datagram. */
-        ipch = ip_comp_hdr(skb);
-        ipch->nexthdr = *skb_mac_header(skb);
-        ipch->flags = 0;
-        ipch->cpi = htons((u16 )ntohl(x->id.spi));
-        *skb_mac_header(skb) = IPPROTO_COMP;
-out_ok:
-        skb_push(skb, -skb_network_offset(skb));
-        return 0;
-}
+#include <net/sock.h>
 
 static void ipcomp4_err(struct sk_buff *skb, u32 info)
 {
@@ -241,156 +102,12 @@ out:
         return err;
 }