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authorHarald Welte <laforge@netfilter.org>2006-03-20 17:56:32 -0800
committerDavid S. Miller <davem@davemloft.net>2006-03-20 17:56:32 -0800
commitdc808fe28db59fadf4ec32d53f62477fa28f3be8 (patch)
tree2d7033e5808a63d7fb1bddc452d1ec0b2f3d381a /net/ipv6
parent0d36f37bb1e1cbadca6dc90a840bb2bc9ab51c44 (diff)
downloadlinux-dc808fe28db59fadf4ec32d53f62477fa28f3be8.tar.bz2
[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 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c39
1 files changed, 22 insertions, 17 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index ac702a29dd16..ac35f9526368 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -179,31 +179,36 @@ static unsigned int ipv6_confirm(unsigned int hooknum,
int (*okfn)(struct sk_buff *))
{
struct nf_conn *ct;
+ struct nf_conn_help *help;
enum ip_conntrack_info ctinfo;
+ unsigned int ret, protoff;
+ unsigned int extoff = (u8*)((*pskb)->nh.ipv6h + 1)
+ - (*pskb)->data;
+ unsigned char pnum = (*pskb)->nh.ipv6h->nexthdr;
+
/* This is where we call the helper: as the packet goes out. */
ct = nf_ct_get(*pskb, &ctinfo);
- if (ct && ct->helper) {
- unsigned int ret, protoff;
- unsigned int extoff = (u8*)((*pskb)->nh.ipv6h + 1)
- - (*pskb)->data;
- unsigned char pnum = (*pskb)->nh.ipv6h->nexthdr;
-
- protoff = nf_ct_ipv6_skip_exthdr(*pskb, extoff, &pnum,
- (*pskb)->len - extoff);
- if (protoff < 0 || protoff > (*pskb)->len ||
- pnum == NEXTHDR_FRAGMENT) {
- DEBUGP("proto header not found\n");
- return NF_ACCEPT;
- }
+ if (!ct)
+ goto out;
- ret = ct->helper->help(pskb, protoff, ct, ctinfo);
- if (ret != NF_ACCEPT)
- return ret;
+ help = nfct_help(ct);
+ if (!help || !help->helper)
+ goto out;
+
+ protoff = nf_ct_ipv6_skip_exthdr(*pskb, extoff, &pnum,
+ (*pskb)->len - extoff);
+ if (protoff < 0 || protoff > (*pskb)->len ||
+ pnum == NEXTHDR_FRAGMENT) {
+ DEBUGP("proto header not found\n");
+ return NF_ACCEPT;
}
+ ret = help->helper->help(pskb, protoff, ct, ctinfo);
+ if (ret != NF_ACCEPT)
+ return ret;
+out:
/* We've seen it coming out the other side: confirm it */
-
return nf_conntrack_confirm(pskb);
}