Signed-off-by: Fernando Fernandez Mancera <ffmancera@xxxxxxxxxx>
---
include/linux/netfilter/nf_osf.h | 2 +
include/uapi/linux/netfilter/nf_osf.h | 5 +
include/uapi/linux/netfilter/xt_osf.h | 8 --
net/netfilter/Kconfig | 10 +-
net/netfilter/Makefile | 1 +
net/netfilter/nf_osf.c | 7 ++
net/netfilter/nfnetlink_osf.c | 134 ++++++++++++++++++++++++++
net/netfilter/xt_osf.c | 133 ++-----------------------
8 files changed, 164 insertions(+), 136 deletions(-)
create mode 100644 net/netfilter/nfnetlink_osf.c
diff --git a/include/linux/netfilter/nf_osf.h b/include/linux/netfilter/nf_osf.h
index 7d0947d6ef16..3411c87152d7 100644
--- a/include/linux/netfilter/nf_osf.h
+++ b/include/linux/netfilter/nf_osf.h
@@ -27,6 +27,8 @@ struct nf_osf_finger {
struct nf_osf_user_finger finger;
};
+extern struct list_head nf_osf_fingers[2];
+
bool nf_osf_match(const struct sk_buff *skb, u_int8_t family,
int hooknum, struct net_device *in, struct net_device *out,
const struct nf_osf_info *info, struct net *net,
diff --git a/include/uapi/linux/netfilter/nf_osf.h b/include/uapi/linux/netfilter/nf_osf.h
index a89583099b2a..18516829fce1 100644
--- a/include/uapi/linux/netfilter/nf_osf.h
+++ b/include/uapi/linux/netfilter/nf_osf.h
@@ -96,4 +96,9 @@ enum nf_osf_attr_type {
OSF_ATTR_MAX,
};
+enum nf_osf_msg_types {
+ OSF_MSG_ADD,
+ OSF_MSG_REMOVE,
+ OSF_MSG_MAX,
+};
#endif /* _NF_OSF_H */
diff --git a/include/uapi/linux/netfilter/xt_osf.h b/include/uapi/linux/netfilter/xt_osf.h
index b189007f4f28..6fe4d75b1f11 100644
--- a/include/uapi/linux/netfilter/xt_osf.h
+++ b/include/uapi/linux/netfilter/xt_osf.h
@@ -47,13 +47,5 @@
#define xt_osf_nlmsg nf_osf_nlmsg
#define xt_osf_attr_type nf_osf_attr_type
-/*
- * Add/remove fingerprint from the kernel.
- */
-enum xt_osf_msg_types {
- OSF_MSG_ADD,
- OSF_MSG_REMOVE,
- OSF_MSG_MAX,
-};
#endif /* _XT_OSF_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 6c65d756e603..06abc3bc05d3 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -46,6 +46,14 @@ config NETFILTER_NETLINK_LOG
and is also scheduled to replace the old syslog-based ipt_LOG
and ip6t_LOG modules.
+config NETFILTER_NETLINK_OSF
+ tristate "Netfilter OSF over NFNETLINK interface"
+ depends on NETFILTER_ADVANCED
+ select NETFILTER_NETLINK
+ help
+ If this option is enabled, the kernel will include support
+ for passive OS fingerprint via NFNETLINK.
+
config NF_CONNTRACK
tristate "Netfilter connection tracking support"
default m if NETFILTER_ADVANCED=n
@@ -1379,8 +1387,8 @@ config NETFILTER_XT_MATCH_NFACCT
config NETFILTER_XT_MATCH_OSF
tristate '"osf" Passive OS fingerprint match'
- depends on NETFILTER_ADVANCED && NETFILTER_NETLINK
select NF_OSF
+ select NETFILTER_NETLINK_OSF
help
This option selects the Passive OS Fingerprinting match module
that allows to passively match the remote operating system by
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 0b3851e825fa..ab144e65edf1 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_NETFILTER_NETLINK) += nfnetlink.o
obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o
obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o
obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o
+obj-$(CONFIG_NETFILTER_NETLINK_OSF) += nfnetlink_osf.o
# connection tracking
obj-$(CONFIG_NF_CONNTRACK) += nf_conntrack.o
diff --git a/net/netfilter/nf_osf.c b/net/netfilter/nf_osf.c
index f4c75e982902..b5c3af060d62 100644
--- a/net/netfilter/nf_osf.c
+++ b/net/netfilter/nf_osf.c
@@ -20,6 +20,13 @@
#include <net/netfilter/nf_log.h>
#include <linux/netfilter/nf_osf.h>
+/*
+ * Indexed by dont-fragment bit.
+ * It is the only constant value in the fingerprint.
+ */
+struct list_head nf_osf_fingers[2];
+EXPORT_SYMBOL_GPL(nf_osf_fingers);
+
static inline int nf_osf_ttl(const struct sk_buff *skb,
int ttl_check, unsigned char f_ttl)
{
diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c
new file mode 100644
index 000000000000..ba71f04a4004
--- /dev/null
+++ b/net/netfilter/nfnetlink_osf.c
@@ -0,0 +1,134 @@
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_osf.h>
+
+static const struct nla_policy nfnl_osf_policy[OSF_ATTR_MAX + 1] = {
+ [OSF_ATTR_FINGER] = { .len = sizeof(struct nf_osf_user_finger) },
+};
+
+static int nfnl_osf_add_callback(struct net *net, struct sock *ctnl,
+ struct sk_buff *skb, const struct nlmsghdr *nlh,
+ const struct nlattr * const osf_attrs[],
+ struct netlink_ext_ack *extack)
+{
+ struct nf_osf_user_finger *f;
+ struct nf_osf_finger *kf = NULL, *sf;
+ int err = 0;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (!osf_attrs[OSF_ATTR_FINGER])
+ return -EINVAL;
+
+ if (!(nlh->nlmsg_flags & NLM_F_CREATE))
+ return -EINVAL;
+
+ f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
+
+ kf = kmalloc(sizeof(struct nf_osf_finger), GFP_KERNEL);
+ if (!kf)
+ return -ENOMEM;
+
+ memcpy(&kf->finger, f, sizeof(struct nf_osf_user_finger));
+
+ list_for_each_entry(sf, &nf_osf_fingers[!!f->df], finger_entry) {
+ if (memcmp(&sf->finger, f, sizeof(struct nf_osf_user_finger)))
+ continue;
+
+ kfree(kf);
+ kf = NULL;
+
+ if (nlh->nlmsg_flags & NLM_F_EXCL)
+ err = -EEXIST;
+ break;
+ }
+
+ /*
+ * We are protected by nfnl mutex.
+ */
+ if (kf)
+ list_add_tail_rcu(&kf->finger_entry, &nf_osf_fingers[!!f->df]);
+
+ return err;
+}
+
+static int nfnl_osf_remove_callback(struct net *net, struct sock *ctnl,
+ struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ const struct nlattr * const osf_attrs[],
+ struct netlink_ext_ack *extack)
+{
+ struct nf_osf_user_finger *f;
+ struct nf_osf_finger *sf;
+ int err = -ENOENT;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (!osf_attrs[OSF_ATTR_FINGER])
+ return -EINVAL;
+
+ f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
+
+ list_for_each_entry(sf, &nf_osf_fingers[!!f->df], finger_entry) {
+ if (memcmp(&sf->finger, f, sizeof(struct nf_osf_user_finger)))
+ continue;
+
+ /*
+ * We are protected by nfnl mutex.
+ */
+ list_del_rcu(&sf->finger_entry);
+ kfree_rcu(sf, rcu_head);
+
+ err = 0;
+ break;
+ }
+
+ return err;
+}
+
+static const struct nfnl_callback nfnl_nf_osf_callbacks[OSF_MSG_MAX] = {
+ [OSF_MSG_ADD] = {
+ .call = nfnl_osf_add_callback,
+ .attr_count = OSF_ATTR_MAX,
+ .policy = nfnl_osf_policy,
+ },
+ [OSF_MSG_REMOVE] = {
+ .call = nfnl_osf_remove_callback,
+ .attr_count = OSF_ATTR_MAX,
+ .policy = nfnl_osf_policy,
+ },
+};
+
+static const struct nfnetlink_subsystem nfnl_osf_subsys = {
+ .name = "osf",
+ .subsys_id = NFNL_SUBSYS_OSF,
+ .cb_count = OSF_MSG_MAX,
+ .cb = nfnl_nf_osf_callbacks,
+};
+
+static int __init nfnl_osf_init(void)
+{
+ int err = -EINVAL;
+
+ err = nfnetlink_subsys_register(&nfnl_osf_subsys);
+ if (err < 0) {
+ pr_err("Failed to register OSF nsfnetlink helper (%d)\n", err);
+ goto err_out_exit;
+ }
+
+ return 0;
+
+err_out_exit:
+ return err;
+}
+
+static void __exit nfnl_osf_fini(void)
+{
+ nfnetlink_subsys_unregister(&nfnl_osf_subsys);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Fernando Fernandez <ffmancera@xxxxxxxxxx>");
+module_init(nfnl_osf_init);
+module_exit(nfnl_osf_fini);
diff --git a/net/netfilter/xt_osf.c b/net/netfilter/xt_osf.c
index 9cfef73b4107..a7dcfb9835c4 100644
--- a/net/netfilter/xt_osf.c
+++ b/net/netfilter/xt_osf.c
@@ -37,118 +37,6 @@
#include <net/netfilter/nf_log.h>
#include <linux/netfilter/xt_osf.h>
-/*
- * Indexed by dont-fragment bit.
- * It is the only constant value in the fingerprint.
- */
-static struct list_head xt_osf_fingers[2];
-
-static const struct nla_policy xt_osf_policy[OSF_ATTR_MAX + 1] = {
- [OSF_ATTR_FINGER] = { .len = sizeof(struct xt_osf_user_finger) },
-};
-
-static int xt_osf_add_callback(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const osf_attrs[],
- struct netlink_ext_ack *extack)
-{
- struct xt_osf_user_finger *f;
- struct xt_osf_finger *kf = NULL, *sf;
- int err = 0;
-
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
- if (!osf_attrs[OSF_ATTR_FINGER])
- return -EINVAL;
-
- if (!(nlh->nlmsg_flags & NLM_F_CREATE))
- return -EINVAL;
-
- f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
-
- kf = kmalloc(sizeof(struct xt_osf_finger), GFP_KERNEL);
- if (!kf)
- return -ENOMEM;
-
- memcpy(&kf->finger, f, sizeof(struct xt_osf_user_finger));
-
- list_for_each_entry(sf, &xt_osf_fingers[!!f->df], finger_entry) {
- if (memcmp(&sf->finger, f, sizeof(struct xt_osf_user_finger)))
- continue;
-
- kfree(kf);
- kf = NULL;
-
- if (nlh->nlmsg_flags & NLM_F_EXCL)
- err = -EEXIST;
- break;
- }
-
- /*
- * We are protected by nfnl mutex.
- */
- if (kf)
- list_add_tail_rcu(&kf->finger_entry, &xt_osf_fingers[!!f->df]);
-
- return err;
-}
-
-static int xt_osf_remove_callback(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const osf_attrs[],
- struct netlink_ext_ack *extack)
-{
- struct xt_osf_user_finger *f;
- struct xt_osf_finger *sf;
- int err = -ENOENT;
-
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-
- if (!osf_attrs[OSF_ATTR_FINGER])
- return -EINVAL;
-
- f = nla_data(osf_attrs[OSF_ATTR_FINGER]);
-
- list_for_each_entry(sf, &xt_osf_fingers[!!f->df], finger_entry) {
- if (memcmp(&sf->finger, f, sizeof(struct xt_osf_user_finger)))
- continue;
-
- /*
- * We are protected by nfnl mutex.
- */
- list_del_rcu(&sf->finger_entry);
- kfree_rcu(sf, rcu_head);
-
- err = 0;
- break;
- }
-
- return err;
-}
-
-static const struct nfnl_callback xt_osf_nfnetlink_callbacks[OSF_MSG_MAX] = {
- [OSF_MSG_ADD] = {
- .call = xt_osf_add_callback,
- .attr_count = OSF_ATTR_MAX,
- .policy = xt_osf_policy,
- },
- [OSF_MSG_REMOVE] = {
- .call = xt_osf_remove_callback,
- .attr_count = OSF_ATTR_MAX,
- .policy = xt_osf_policy,
- },
-};
-
-static const struct nfnetlink_subsystem xt_osf_nfnetlink = {
- .name = "osf",
- .subsys_id = NFNL_SUBSYS_OSF,
- .cb_count = OSF_MSG_MAX,
- .cb = xt_osf_nfnetlink_callbacks,
-};
-
static bool
xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
{
@@ -159,7 +47,7 @@ xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
return false;
return nf_osf_match(skb, xt_family(p), xt_hooknum(p), xt_in(p),
- xt_out(p), info, net, xt_osf_fingers);
+ xt_out(p), info, net, nf_osf_fingers);
}
static struct xt_match xt_osf_match = {
@@ -180,26 +68,18 @@ static int __init xt_osf_init(void)
int err = -EINVAL;
int i;
- for (i=0; i<ARRAY_SIZE(xt_osf_fingers); ++i)
- INIT_LIST_HEAD(&xt_osf_fingers[i]);
-
- err = nfnetlink_subsys_register(&xt_osf_nfnetlink);
- if (err < 0) {
- pr_err("Failed to register OSF nsfnetlink helper (%d)\n", err);
- goto err_out_exit;
- }
+ for (i = 0; i < ARRAY_SIZE(nf_osf_fingers); ++i)
+ INIT_LIST_HEAD(&nf_osf_fingers[i]);
err = xt_register_match(&xt_osf_match);
if (err) {
pr_err("Failed to register OS fingerprint "
"matching module (%d)\n", err);
- goto err_out_remove;
+ goto err_out_exit;
}
return 0;
-err_out_remove:
- nfnetlink_subsys_unregister(&xt_osf_nfnetlink);
err_out_exit:
return err;
}
@@ -209,13 +89,12 @@ static void __exit xt_osf_fini(void)
struct xt_osf_finger *f;
int i;
- nfnetlink_subsys_unregister(&xt_osf_nfnetlink);
xt_unregister_match(&xt_osf_match);
rcu_read_lock();
- for (i=0; i<ARRAY_SIZE(xt_osf_fingers); ++i) {
+ for (i = 0; i < ARRAY_SIZE(nf_osf_fingers); ++i) {
- list_for_each_entry_rcu(f, &xt_osf_fingers[i], finger_entry) {
+ list_for_each_entry_rcu(f, &nf_osf_fingers[i], finger_entry) {
list_del_rcu(&f->finger_entry);
kfree_rcu(f, rcu_head);
}
--
2.18.0
--
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