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[NETFILTER]: nf_conntrack_expect: support inactive expectations 

This is useful for the SIP helper and signalling expectations.
We don't want to create a full-blown expectation with a wildcard
as source based on a single UDP packet, but need to know the
final port anyways. With inactive expectations we can register
the expectation and reserve the tuple, but wait for confirmation
from the registrar before activating it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-03-25 20:08:37 -07:00 committed by David S. Miller
parent 4bb119eab7
commit 359b9ab614
2 changed files with 23 additions and 5 deletions
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3
include/net/netfilter/nf_conntrack_expect.h
View File

@ -53,7 +53,8 @@ struct nf_conntrack_expect
struct rcu_head rcu;
};
#define NF_CT_EXPECT_PERMANENT 0x1
#define NF_CT_EXPECT_PERMANENT 0x1
#define NF_CT_EXPECT_INACTIVE 0x2
int nf_conntrack_expect_init(void);
void nf_conntrack_expect_fini(void);

25
net/netfilter/nf_conntrack_expect.c
View File

@ -126,9 +126,21 @@ EXPORT_SYMBOL_GPL(nf_ct_expect_find_get);
struct nf_conntrack_expect *
nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple)
{
struct nf_conntrack_expect *exp;
struct nf_conntrack_expect *i, *exp = NULL;
struct hlist_node *n;
unsigned int h;
exp = __nf_ct_expect_find(tuple);
if (!nf_ct_expect_count)
return NULL;
h = nf_ct_expect_dst_hash(tuple);
hlist_for_each_entry(i, n, &nf_ct_expect_hash[h], hnode) {
if (!(i->flags & NF_CT_EXPECT_INACTIVE) &&
nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask)) {
exp = i;
break;
}
}
if (!exp)
return NULL;
@ -460,6 +472,7 @@ static int exp_seq_show(struct seq_file *s, void *v)
{
struct nf_conntrack_expect *expect;
struct hlist_node *n = v;
char *delim = "";
expect = hlist_entry(n, struct nf_conntrack_expect, hnode);
@ -476,8 +489,12 @@ static int exp_seq_show(struct seq_file *s, void *v)
__nf_ct_l4proto_find(expect->tuple.src.l3num,
expect->tuple.dst.protonum));
if (expect->flags & NF_CT_EXPECT_PERMANENT)
seq_printf(s, "PERMANENT ");
if (expect->flags & NF_CT_EXPECT_PERMANENT) {
seq_printf(s, "PERMANENT");
delim = ",";
}
if (expect->flags & NF_CT_EXPECT_INACTIVE)
seq_printf(s, "%sINACTIVE", delim);
return seq_putc(s, '\n');
}