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authorHarald Welte <laforge@netfilter.org>2006-03-21 04:56:32 +0300
committerDavid S. Miller <davem@davemloft.net>2006-03-21 04:56:32 +0300
commitdc808fe28db59fadf4ec32d53f62477fa28f3be8 (patch)
tree2d7033e5808a63d7fb1bddc452d1ec0b2f3d381a /include/net
parent0d36f37bb1e1cbadca6dc90a840bb2bc9ab51c44 (diff)
downloadlinux-dc808fe28db59fadf4ec32d53f62477fa28f3be8.tar.xz
[NETFILTER] nf_conntrack: clean up to reduce size of 'struct nf_conn'
This patch moves all helper related data fields of 'struct nf_conn' into a separate structure 'struct nf_conn_help'. This new structure is only present in conntrack entries for which we actually have a helper loaded. Also, this patch cleans up the nf_conntrack 'features' mechanism to resemble what the original idea was: Just glue the feature-specific data structures at the end of 'struct nf_conn', and explicitly re-calculate the pointer to it when needed rather than keeping pointers around. Saves 20 bytes per conntrack on my x86_64 box. A non-helped conntrack is 276 bytes. We still need to save another 20 bytes in order to fit into to target of 256bytes. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/netfilter/nf_conntrack.h56
1 files changed, 34 insertions, 22 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 6d075ca16e6e..2743c156caa0 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -67,6 +67,18 @@ do { \
struct nf_conntrack_helper;
+/* nf_conn feature for connections that have a helper */
+struct nf_conn_help {
+ /* Helper. if any */
+ struct nf_conntrack_helper *helper;
+
+ union nf_conntrack_help help;
+
+ /* Current number of expected connections */
+ unsigned int expecting;
+};
+
+
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
struct nf_conn
{
@@ -81,6 +93,9 @@ struct nf_conn
/* Have we seen traffic both ways yet? (bitset) */
unsigned long status;
+ /* If we were expected by an expectation, this will be it */
+ struct nf_conn *master;
+
/* Timer function; drops refcnt when it goes off. */
struct timer_list timeout;
@@ -88,38 +103,22 @@ struct nf_conn
/* Accounting Information (same cache line as other written members) */
struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
#endif
- /* If we were expected by an expectation, this will be it */
- struct nf_conn *master;
-
- /* Current number of expected connections */
- unsigned int expecting;
/* Unique ID that identifies this conntrack*/
unsigned int id;
- /* Helper. if any */
- struct nf_conntrack_helper *helper;
-
/* features - nat, helper, ... used by allocating system */
u_int32_t features;
- /* Storage reserved for other modules: */
-
- union nf_conntrack_proto proto;
-
#if defined(CONFIG_NF_CONNTRACK_MARK)
u_int32_t mark;
#endif
- /* These members are dynamically allocated. */
-
- union nf_conntrack_help *help;
+ /* Storage reserved for other modules: */
+ union nf_conntrack_proto proto;
- /* Layer 3 dependent members. (ex: NAT) */
- union {
- struct nf_conntrack_ipv4 *ipv4;
- } l3proto;
- void *data[0];
+ /* features dynamically at the end: helper, nat (both optional) */
+ char data[0];
};
struct nf_conntrack_expect
@@ -373,10 +372,23 @@ nf_conntrack_expect_event(enum ip_conntrack_expect_events event,
#define NF_CT_F_NUM 4
extern int
-nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size,
- int (*init_conntrack)(struct nf_conn *, u_int32_t));
+nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
extern void
nf_conntrack_unregister_cache(u_int32_t features);
+/* valid combinations:
+ * basic: nf_conn, nf_conn .. nf_conn_help
+ * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat, nf_conn help
+ */
+static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
+{
+ unsigned int offset = sizeof(struct nf_conn);
+
+ if (!(ct->features & NF_CT_F_HELP))
+ return NULL;
+
+ return (struct nf_conn_help *) ((void *)ct + offset);
+}
+
#endif /* __KERNEL__ */
#endif /* _NF_CONNTRACK_H */