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authorYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>2007-07-07 22:23:21 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-10 22:17:17 -0700
commitecfab2c9fe5597221c2b30dec48634a2361a0d08 (patch)
tree5640796c698074105430c1c1bc24df87f4d0a6b4 /include
parent4ba887790ce2015e8c464809c0be902fb813ad15 (diff)
[NETFILTER]: nf_conntrack: introduce extension infrastructure
Old space allocator of conntrack had problems about extensibility. - It required slab cache per combination of extensions. - It expected what extensions would be assigned, but it was impossible to expect that completely, then we allocated bigger memory object than really required. - It needed to search helper twice due to lock issue. Now basic informations of a connection are stored in 'struct nf_conn'. And a storage for extension (helper, NAT) is allocated by kmalloc. Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/netfilter/nf_conntrack.h3
-rw-r--r--include/net/netfilter/nf_conntrack_extend.h80
2 files changed, 83 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 12a0e793cc0..c31382d3ef1 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -131,6 +131,9 @@ struct nf_conn
/* Storage reserved for other modules: */
union nf_conntrack_proto proto;
+ /* Extensions */
+ struct nf_ct_ext *ext;
+
/* features dynamically at the end: helper, nat (both optional) */
char data[0];
};
diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
new file mode 100644
index 00000000000..8a988d13646
--- /dev/null
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -0,0 +1,80 @@
+#ifndef _NF_CONNTRACK_EXTEND_H
+#define _NF_CONNTRACK_EXTEND_H
+
+#include <net/netfilter/nf_conntrack.h>
+
+enum nf_ct_ext_id
+{
+ NF_CT_EXT_NUM,
+};
+
+/* Extensions: optional stuff which isn't permanently in struct. */
+struct nf_ct_ext {
+ u8 offset[NF_CT_EXT_NUM];
+ u8 len;
+ u8 real_len;
+ char data[0];
+};
+
+static inline int nf_ct_ext_exist(const struct nf_conn *ct, u8 id)
+{
+ return (ct->ext && ct->ext->offset[id]);
+}
+
+static inline void *__nf_ct_ext_find(const struct nf_conn *ct, u8 id)
+{
+ if (!nf_ct_ext_exist(ct, id))
+ return NULL;
+
+ return (void *)ct->ext + ct->ext->offset[id];
+}
+#define nf_ct_ext_find(ext, id) \
+ ((id##_TYPE *)__nf_ct_ext_find((ext), (id)))
+
+/* Destroy all relationships */
+extern void __nf_ct_ext_destroy(struct nf_conn *ct);
+static inline void nf_ct_ext_destroy(struct nf_conn *ct)
+{
+ if (ct->ext)
+ __nf_ct_ext_destroy(ct);
+}
+
+/* Free operation. If you want to free a object referred from private area,
+ * please implement __nf_ct_ext_free() and call it.
+ */
+static inline void nf_ct_ext_free(struct nf_conn *ct)
+{
+ if (ct->ext)
+ kfree(ct->ext);
+}
+
+/* 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_add(ct, id, gfp) \
+ ((id##_TYPE *)__nf_ct_ext_add((ct), (id), (gfp)))
+
+#define NF_CT_EXT_F_PREALLOC 0x0001
+
+struct nf_ct_ext_type
+{
+ /* Destroys relationships (can be NULL). */
+ void (*destroy)(struct nf_conn *ct);
+ /* Called when realloacted (can be NULL).
+ Contents has already been moved. */
+ void (*move)(struct nf_conn *ct, void *old);
+
+ 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);
+void nf_ct_extend_unregister(struct nf_ct_ext_type *type);
+#endif /* _NF_CONNTRACK_EXTEND_H */