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netfilter: ctnetlink: allow to set helper for new expectations 

This patch allow you to set the helper for newly created
expectations based of the CTA_EXPECT_HELP_NAME attribute.
Before this, the helper set was NULL.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-02-05 02:34:16 +01:00
parent 7f81c951d9
commit 660fdb2a0f
1 changed files with 29 additions and 1 deletions
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30
net/netfilter/nf_conntrack_netlink.c
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@ -2042,6 +2042,7 @@ ctnetlink_create_expect(struct net *net, u16 zone,
struct nf_conntrack_expect *exp;
struct nf_conn *ct;
struct nf_conn_help *help;
struct nf_conntrack_helper *helper = NULL;
int err = 0;
/* caller guarantees that those three CTA_EXPECT_* exist */
@ -2060,6 +2061,33 @@ ctnetlink_create_expect(struct net *net, u16 zone,
if (!h)
return -ENOENT;
ct = nf_ct_tuplehash_to_ctrack(h);
/* Look for helper of this expectation */
if (cda[CTA_EXPECT_HELP_NAME]) {
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper == NULL) {
#ifdef CONFIG_MODULES
if (request_module("nfct-helper-%s", helpname) < 0) {
err = -EOPNOTSUPP;
goto out;
}
helper = __nf_conntrack_helper_find(helpname,
nf_ct_l3num(ct),
nf_ct_protonum(ct));
if (helper) {
err = -EAGAIN;
goto out;
}
#endif
err = -EOPNOTSUPP;
goto out;
}
}
exp = nf_ct_expect_alloc(ct);
if (!exp) {
err = -ENOMEM;
@ -2090,7 +2118,7 @@ ctnetlink_create_expect(struct net *net, u16 zone,
exp->class = 0;
exp->expectfn = NULL;
exp->master = ct;
exp->helper = NULL;
exp->helper = helper;
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
exp->mask.src.u.all = mask.src.u.all;