netfilter: conntrack: remove prealloc support

It was used by the nat extension, but since commit
7c9664351980 ("netfilter: move nat hlist_head to nf_conn") its only needed
for connections that use MASQUERADE target or a nat helper.

Also it seems a lot easier to preallocate a fixed size instead.

With default settings, conntrack first adds ecache extension (sysctl
defaults to 1), so we get 40(ct extension header) + 24 (ecache) == 64 byte
on x86_64 for initial allocation.

Followup patches can constify the extension structs and avoid
the initial zeroing of the entire extension area.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 0 insertions, 6 deletions

diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
index 5fc908dc9f32..dd776bf9e2fa 100644
--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -88,21 +88,15 @@ static inline void nf_ct_ext_free(struct nf_conn *ct)
 /* Add this type, returns pointer to data or NULL. */
 void *nf_ct_ext_add(struct nf_conn *ct, enum nf_ct_ext_id id, gfp_t gfp);
 
-#define NF_CT_EXT_F_PREALLOC    0x0001
-
 struct nf_ct_ext_type {
         /* Destroys relationships (can be NULL). */
         void (*destroy)(struct nf_conn *ct);
 
         enum nf_ct_ext_id id;
 
-        unsigned int flags;
-
         /* Length and min alignment. */
         u8 len;
         u8 align;
-        /* initial size of nf_ct_ext. */
-        u8 alloc_size;
 };
 
 int nf_ct_extend_register(struct nf_ct_ext_type *type);