From b9f78f9fca626875af8adc0f7366a38b8e625a0e Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 22 Mar 2006 13:56:08 -0800 Subject: [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 Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/xt_state.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'net/netfilter/xt_state.c') diff --git a/net/netfilter/xt_state.c b/net/netfilter/xt_state.c index 7cd557c932baf..e6c0be9d94d21 100644 --- a/net/netfilter/xt_state.c +++ b/net/netfilter/xt_state.c @@ -44,9 +44,36 @@ match(const struct sk_buff *skb, return (sinfo->statemask & statebit); } +static int check(const char *tablename, + const void *inf, + 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 state_match = { .name = "state", .match = match, + .checkentry = check, + .destroy = destroy, .matchsize = sizeof(struct xt_state_info), .family = AF_INET, .me = THIS_MODULE, @@ -55,6 +82,8 @@ static struct xt_match state_match = { static struct xt_match state6_match = { .name = "state", .match = match, + .checkentry = check, + .destroy = destroy, .matchsize = sizeof(struct xt_state_info), .family = AF_INET6, .me = THIS_MODULE, -- cgit 1.2.3-korg