diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2006-03-22 13:56:08 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-03-22 13:56:08 -0800 |
| commit | b9f78f9fca626875af8adc0f7366a38b8e625a0e (patch) | |
| tree | 1087c6f6a6cc39e4e55c2a02f93d93da67a68ed3 /net/netfilter/xt_conntrack.c | |
| parent | a45049c51ce6a3fecf2a909b591b28164c927112 (diff) | |
[NETFILTER]: nf_conntrack: support for layer 3 protocol load on demand
x_tables matches and targets that require nf_conntrack_ipv[4|6] to work
don't have enough information to load on demand these modules. This
patch introduces the following changes to solve this issue:
o nf_ct_l3proto_try_module_get: try to load the layer 3 connection
tracker module and increases the refcount.
o nf_ct_l3proto_module put: drop the refcount of the module.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter/xt_conntrack.c')
| -rw-r--r-- | net/netfilter/xt_conntrack.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/net/netfilter/xt_conntrack.c b/net/netfilter/xt_conntrack.c index 7d20caa0d60..65a84809fd3 100644 --- a/net/netfilter/xt_conntrack.c +++ b/net/netfilter/xt_conntrack.c @@ -203,9 +203,37 @@ match(const struct sk_buff *skb, #endif /* CONFIG_NF_IP_CONNTRACK */ +static int +checkentry(const char *tablename, + const void *ip, + const struct xt_match *match, + void *matchinfo, + unsigned int matchsize, + unsigned int hook_mask) +{ +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + if (nf_ct_l3proto_try_module_get(match->family) < 0) { + printk(KERN_WARNING "can't load nf_conntrack support for " + "proto=%d\n", match->family); + return 0; + } +#endif + return 1; +} + +static void +destroy(const struct xt_match *match, void *matchinfo, unsigned int matchsize) +{ +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) + nf_ct_l3proto_module_put(match->family); +#endif +} + static struct xt_match conntrack_match = { .name = "conntrack", .match = match, + .checkentry = checkentry, + .destroy = destroy, .matchsize = sizeof(struct xt_conntrack_info), .family = AF_INET, .me = THIS_MODULE, |