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netfilter: synproxy: only register hooks when needed
Defer registration of the synproxy hooks until the first SYNPROXY rule is added. Also means we only register hooks in namespaces that need it. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
parent
122868b378
commit
1fefe14725
@ -52,6 +52,8 @@ struct synproxy_stats {
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struct synproxy_net {
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struct nf_conn *tmpl;
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struct synproxy_stats __percpu *stats;
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unsigned int hook_ref4;
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unsigned int hook_ref6;
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};
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extern unsigned int synproxy_net_id;
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@ -409,33 +409,6 @@ static unsigned int ipv4_synproxy_hook(void *priv,
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return NF_ACCEPT;
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}
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static int synproxy_tg4_check(const struct xt_tgchk_param *par)
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{
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const struct ipt_entry *e = par->entryinfo;
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if (e->ip.proto != IPPROTO_TCP ||
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e->ip.invflags & XT_INV_PROTO)
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return -EINVAL;
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return nf_ct_netns_get(par->net, par->family);
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}
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static void synproxy_tg4_destroy(const struct xt_tgdtor_param *par)
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{
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_target synproxy_tg4_reg __read_mostly = {
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.name = "SYNPROXY",
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.family = NFPROTO_IPV4,
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
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.target = synproxy_tg4,
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.targetsize = sizeof(struct xt_synproxy_info),
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.checkentry = synproxy_tg4_check,
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.destroy = synproxy_tg4_destroy,
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.me = THIS_MODULE,
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};
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static struct nf_hook_ops ipv4_synproxy_ops[] __read_mostly = {
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{
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.hook = ipv4_synproxy_hook,
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@ -451,31 +424,63 @@ static struct nf_hook_ops ipv4_synproxy_ops[] __read_mostly = {
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},
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};
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static int __init synproxy_tg4_init(void)
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static int synproxy_tg4_check(const struct xt_tgchk_param *par)
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{
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struct synproxy_net *snet = synproxy_pernet(par->net);
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const struct ipt_entry *e = par->entryinfo;
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int err;
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err = nf_register_hooks(ipv4_synproxy_ops,
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ARRAY_SIZE(ipv4_synproxy_ops));
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if (err < 0)
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goto err1;
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if (e->ip.proto != IPPROTO_TCP ||
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e->ip.invflags & XT_INV_PROTO)
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return -EINVAL;
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err = xt_register_target(&synproxy_tg4_reg);
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if (err < 0)
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goto err2;
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err = nf_ct_netns_get(par->net, par->family);
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if (err)
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return err;
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return 0;
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if (snet->hook_ref4 == 0) {
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err = nf_register_net_hooks(par->net, ipv4_synproxy_ops,
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ARRAY_SIZE(ipv4_synproxy_ops));
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if (err) {
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nf_ct_netns_put(par->net, par->family);
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return err;
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}
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}
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err2:
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nf_unregister_hooks(ipv4_synproxy_ops, ARRAY_SIZE(ipv4_synproxy_ops));
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err1:
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snet->hook_ref4++;
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return err;
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}
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static void synproxy_tg4_destroy(const struct xt_tgdtor_param *par)
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{
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struct synproxy_net *snet = synproxy_pernet(par->net);
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snet->hook_ref4--;
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if (snet->hook_ref4 == 0)
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nf_unregister_net_hooks(par->net, ipv4_synproxy_ops,
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ARRAY_SIZE(ipv4_synproxy_ops));
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_target synproxy_tg4_reg __read_mostly = {
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.name = "SYNPROXY",
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.family = NFPROTO_IPV4,
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
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.target = synproxy_tg4,
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.targetsize = sizeof(struct xt_synproxy_info),
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.checkentry = synproxy_tg4_check,
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.destroy = synproxy_tg4_destroy,
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.me = THIS_MODULE,
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};
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static int __init synproxy_tg4_init(void)
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{
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return xt_register_target(&synproxy_tg4_reg);
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}
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static void __exit synproxy_tg4_exit(void)
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{
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xt_unregister_target(&synproxy_tg4_reg);
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nf_unregister_hooks(ipv4_synproxy_ops, ARRAY_SIZE(ipv4_synproxy_ops));
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}
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module_init(synproxy_tg4_init);
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@ -430,34 +430,6 @@ static unsigned int ipv6_synproxy_hook(void *priv,
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return NF_ACCEPT;
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}
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static int synproxy_tg6_check(const struct xt_tgchk_param *par)
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{
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const struct ip6t_entry *e = par->entryinfo;
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if (!(e->ipv6.flags & IP6T_F_PROTO) ||
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e->ipv6.proto != IPPROTO_TCP ||
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e->ipv6.invflags & XT_INV_PROTO)
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return -EINVAL;
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return nf_ct_netns_get(par->net, par->family);
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}
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static void synproxy_tg6_destroy(const struct xt_tgdtor_param *par)
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{
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_target synproxy_tg6_reg __read_mostly = {
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.name = "SYNPROXY",
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.family = NFPROTO_IPV6,
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
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.target = synproxy_tg6,
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.targetsize = sizeof(struct xt_synproxy_info),
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.checkentry = synproxy_tg6_check,
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.destroy = synproxy_tg6_destroy,
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.me = THIS_MODULE,
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};
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static struct nf_hook_ops ipv6_synproxy_ops[] __read_mostly = {
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{
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.hook = ipv6_synproxy_hook,
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@ -473,31 +445,64 @@ static struct nf_hook_ops ipv6_synproxy_ops[] __read_mostly = {
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},
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};
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static int __init synproxy_tg6_init(void)
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static int synproxy_tg6_check(const struct xt_tgchk_param *par)
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{
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struct synproxy_net *snet = synproxy_pernet(par->net);
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const struct ip6t_entry *e = par->entryinfo;
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int err;
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err = nf_register_hooks(ipv6_synproxy_ops,
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ARRAY_SIZE(ipv6_synproxy_ops));
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if (err < 0)
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goto err1;
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if (!(e->ipv6.flags & IP6T_F_PROTO) ||
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e->ipv6.proto != IPPROTO_TCP ||
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e->ipv6.invflags & XT_INV_PROTO)
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return -EINVAL;
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err = xt_register_target(&synproxy_tg6_reg);
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if (err < 0)
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goto err2;
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err = nf_ct_netns_get(par->net, par->family);
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if (err)
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return err;
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return 0;
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if (snet->hook_ref6 == 0) {
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err = nf_register_net_hooks(par->net, ipv6_synproxy_ops,
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ARRAY_SIZE(ipv6_synproxy_ops));
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if (err) {
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nf_ct_netns_put(par->net, par->family);
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return err;
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}
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}
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err2:
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nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops));
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err1:
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snet->hook_ref6++;
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return err;
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}
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static void synproxy_tg6_destroy(const struct xt_tgdtor_param *par)
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{
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struct synproxy_net *snet = synproxy_pernet(par->net);
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snet->hook_ref6--;
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if (snet->hook_ref6 == 0)
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nf_unregister_net_hooks(par->net, ipv6_synproxy_ops,
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ARRAY_SIZE(ipv6_synproxy_ops));
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_target synproxy_tg6_reg __read_mostly = {
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.name = "SYNPROXY",
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.family = NFPROTO_IPV6,
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
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.target = synproxy_tg6,
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.targetsize = sizeof(struct xt_synproxy_info),
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.checkentry = synproxy_tg6_check,
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.destroy = synproxy_tg6_destroy,
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.me = THIS_MODULE,
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};
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static int __init synproxy_tg6_init(void)
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{
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return xt_register_target(&synproxy_tg6_reg);
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}
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static void __exit synproxy_tg6_exit(void)
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{
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xt_unregister_target(&synproxy_tg6_reg);
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nf_unregister_hooks(ipv6_synproxy_ops, ARRAY_SIZE(ipv6_synproxy_ops));
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}
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module_init(synproxy_tg6_init);
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