Introduce an xtables add-on for matching L2TP packets. Supports L2TPv2
and L2TPv3 over IPv4 and IPv6. As well as filtering on L2TP tunnel-id
and session-id, the filtering decision can also include the L2TP
packet type (control or data), protocol version (2 or 3) and
encapsulation type (UDP or IP).
The most common use for this will likely be to filter L2TP data
packets of individual L2TP tunnels or sessions. While a u32 match can
be used, the L2TP protocol headers are such that field offsets differ
depending on bits set in the header, making rules for matching generic
L2TP connections cumbersome. This match extension takes care of all
that.
An iptables patch will be submitted separately.
---
Changes in v2:
Address comments from Patrick McHardy:-
Added checkentry function to check args passed into kernel.
Changes in v3:
Address comments from Pablo Neira Ayuso:-
Remove debug code.
Avoid multiple nested if statements when they are unnecessary.
Fix data access to use skb_header_pointer() properly.
Use #defines for L2TP packet header bit definitions.
Improve comments to clarify how variations in L2TP header fiekld
locations are handled when parsing header fields.
Signed-off-by: James Chapman <jchapman@xxxxxxxxxxx>
---
include/uapi/linux/netfilter/xt_l2tp.h | 36 ++++
net/netfilter/Kconfig | 10 +
net/netfilter/Makefile | 1 +
net/netfilter/xt_l2tp.c | 355 ++++++++++++++++++++++++++++++++
4 files changed, 402 insertions(+), 0 deletions(-)
create mode 100644 include/uapi/linux/netfilter/xt_l2tp.h
create mode 100644 net/netfilter/xt_l2tp.c
diff --git a/include/uapi/linux/netfilter/xt_l2tp.h b/include/uapi/linux/netfilter/xt_l2tp.h
new file mode 100644
index 0000000..ba0a3ed
--- /dev/null
+++ b/include/uapi/linux/netfilter/xt_l2tp.h
@@ -0,0 +1,36 @@
+#ifndef _LINUX_NETFILTER_XT_L2TP_H
+#define _LINUX_NETFILTER_XT_L2TP_H
+
+#include <linux/types.h>
+
+enum xt_l2tp_encap {
+ XT_L2TP_ENCAP_UDP,
+ XT_L2TP_ENCAP_IP,
+};
+
+enum xt_l2tp_type {
+ XT_L2TP_TYPE_CONTROL,
+ XT_L2TP_TYPE_DATA,
+};
+
+/* L2TP matching stuff */
+struct xt_l2tp_info {
+ __u32 tid; /* tunnel id */
+ __u32 sid; /* session id */
+ __u8 version; /* L2TP protocol version */
+ __u8 encap; /* L2TP encapsulation type */
+ __u8 type; /* L2TP packet type */
+ __u8 flags; /* which fields to match */
+};
+
+enum {
+ XT_L2TP_TID = (1 << 0), /* match L2TP tunnel id */
+ XT_L2TP_SID = (1 << 1), /* match L2TP session id */
+ XT_L2TP_VERSION = (1 << 2), /* match L2TP protocol version */
+ XT_L2TP_ENCAP = (1 << 3), /* match L2TP encapsulation type */
+ XT_L2TP_TYPE = (1 << 4), /* match L2TP packet type */
+};
+
+
+#endif /* _LINUX_NETFILTER_XT_L2TP_H */
+
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 48acec1..12daddc 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -1055,6 +1055,16 @@ config NETFILTER_XT_MATCH_IPVS
If unsure, say N.
+config NETFILTER_XT_MATCH_L2TP
+ tristate '"l2tp" match support'
+ depends on NETFILTER_ADVANCED
+ default L2TP
+ ---help---
+ This option adds an "L2TP" match, which allows you to match against
+ L2TP protocol header fields.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NETFILTER_XT_MATCH_LENGTH
tristate '"length" match support'
depends on NETFILTER_ADVANCED
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 394483b..564bf35 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -135,6 +135,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o
obj-$(CONFIG_NETFILTER_XT_MATCH_HL) += xt_hl.o
obj-$(CONFIG_NETFILTER_XT_MATCH_IPRANGE) += xt_iprange.o
obj-$(CONFIG_NETFILTER_XT_MATCH_IPVS) += xt_ipvs.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_L2TP) += xt_l2tp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o
diff --git a/net/netfilter/xt_l2tp.c b/net/netfilter/xt_l2tp.c
new file mode 100644
index 0000000..b7c060e
--- /dev/null
+++ b/net/netfilter/xt_l2tp.c
@@ -0,0 +1,355 @@
+/* Kernel module to match L2TP header parameters. */
+
+/* (C) 2013 James Chapman <jchapman@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+#include <net/ip.h>
+#include <linux/ipv6.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+#include <linux/l2tp.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/xt_l2tp.h>
+#include <linux/netfilter/x_tables.h>
+
+/* L2TP header masks */
+#define L2TP_HDR_T_BIT 0x8000
+#define L2TP_HDR_L_BIT 0x4000
+#define L2TP_HDR_VER 0x000f
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Chapman <jchapman@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Xtables: L2TP header match");
+MODULE_ALIAS("ipt_l2tp");
+MODULE_ALIAS("ip6t_l2tp");
+
+/* The L2TP fields that can be matched */
+struct l2tp_data {
+ u32 tid;
+ u32 sid;
+ u8 type;
+ u8 version;
+ u8 encap;
+};
+
+union l2tp_val {
+ __be16 val16[2];
+ __be32 val32;
+};
+
+static bool l2tp_match(const struct xt_l2tp_info *info, struct l2tp_data *data)
+{
+ if ((info->flags & XT_L2TP_TYPE) && (info->type != data->type))
+ return false;
+
+ if ((info->flags & XT_L2TP_ENCAP) && (info->encap != data->encap))
+ return false;
+
+ if ((info->flags & XT_L2TP_VERSION) && (info->version != data->version))
+ return false;
+
+ /* Check tid only for L2TPv3 control or any L2TPv2 packets */
+ if ((info->flags & XT_L2TP_TID) &&
+ ((data->type == XT_L2TP_TYPE_CONTROL) || (data->version == 2)) &&
+ (info->tid != data->tid))
+ return false;
+
+ /* Check sid only for L2TP data packets */
+ if ((info->flags & XT_L2TP_SID) && (data->type == XT_L2TP_TYPE_DATA) &&
+ (info->sid != data->sid))
+ return false;
+
+ return true;
+}
+
+/* Parse L2TP header fields when UDP encapsulation is used. Handles
+ * L2TPv2 and L2TPv3.
+ *
+ * L2TPv2:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|L|x|x|S|x|O|P|x|x|x|x| Ver | Length (opt) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Tunnel ID | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ns (opt) | Nr (opt) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Offset Size (opt) | Offset pad... (opt)
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 control packets:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Control Connection ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ns | Nr |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 data packets:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|x|x|x|x|x|x|x|x|x|x|x| Ver | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Cookie (optional, maximum 64 bits)...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static bool l2tp_udp_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_l2tp_info *info = par->matchinfo;
+ int uhlen = sizeof(struct udphdr);
+ int offs = par->thoff + uhlen;
+ bool ret;
+ union l2tp_val *lh;
+ union l2tp_val lhbuf;
+ u16 flags;
+ struct l2tp_data data = { 0, };
+
+ if (par->fragoff != 0)
+ return false;
+
+ /* Extract L2TP header fields. The flags in the first 16 bits
+ * tell us where the other fields are.
+ */
+ lh = skb_header_pointer(skb, offs, 2, &lhbuf);
+ if (lh == NULL)
+ return false;
+
+ flags = ntohs(lh->val16[0]);
+ if (flags & L2TP_HDR_T_BIT)
+ data.type = XT_L2TP_TYPE_CONTROL;
+ else
+ data.type = XT_L2TP_TYPE_DATA;
+ data.version = (u8) flags & L2TP_HDR_VER;
+
+ /* Now extract the L2TP tid/sid. These are in different places
+ * for L2TPv2 (rfc2661) and L2TPv3 (rfc3931). For L2TPv2, we
+ * must also check to see if the length field is present,
+ * since this affects the offsets into the packet of the
+ * tid/sid fields.
+ */
+ if (data.version == 3) {
+ lh = skb_header_pointer(skb, offs + 4, 4, &lhbuf);
+ if (lh == NULL)
+ return false;
+ if (data.type == XT_L2TP_TYPE_CONTROL)
+ data.tid = ntohl(lh->val32);
+ else
+ data.sid = ntohl(lh->val32);
+ } else if (data.version == 2) {
+ if (flags & L2TP_HDR_L_BIT)
+ offs += 2;
+ lh = skb_header_pointer(skb, offs + 2, 4, &lhbuf);
+ if (lh == NULL)
+ return false;
+ data.tid = (u32) ntohs(lh->val16[0]);
+ data.sid = (u32) ntohs(lh->val16[1]);
+ } else
+ return false;
+
+ data.encap = XT_L2TP_ENCAP_UDP;
+
+ ret = l2tp_match(info, &data);
+
+ return ret;
+}
+
+/* Parse L2TP header fields when IP encapsulation (no UDP header).
+ *
+ * L2TPv3 control packets:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | (32 bits of zeros) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Control Connection ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Ns | Nr |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * L2TPv3 data packets:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Session ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Cookie (optional, maximum 64 bits)...
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+static bool l2tp_ip_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_l2tp_info *info = par->matchinfo;
+ bool ret;
+ union l2tp_val *lh;
+ union l2tp_val lhbuf;
+ struct l2tp_data data = { 0, };
+
+ if (par->fragoff != 0)
+ return false;
+
+ /* For IP encap, the L2TP sid is the first 32-bits. */
+ lh = skb_header_pointer(skb, par->thoff, sizeof(lhbuf), &lhbuf);
+ if (lh == NULL)
+ return false;
+ if (lh->val32 == 0) {
+ /* Must be a control packet. The L2TP tid is further
+ * into the packet.
+ */
+ data.type = XT_L2TP_TYPE_CONTROL;
+ lh = skb_header_pointer(skb, par->thoff + 8, sizeof(lhbuf),
+ &lhbuf);
+ if (lh == NULL)
+ return false;
+ data.tid = ntohl(lh->val32);
+ } else {
+ data.sid = ntohl(lh->val32);
+ data.type = XT_L2TP_TYPE_DATA;
+ }
+
+ data.version = 3;
+ data.encap = XT_L2TP_ENCAP_IP;
+
+ ret = l2tp_match(info, &data);
+
+ return ret;
+}
+
+static bool l2tp_mt_common(const struct sk_buff *skb, struct xt_action_param *par, u8 ipproto)
+{
+ bool ret;
+
+ /* The L2TP header is different depending on whether UDP or IP
+ * encapsulation is used.
+ */
+ switch (ipproto) {
+ case IPPROTO_UDP:
+ ret = l2tp_udp_mt(skb, par);
+ break;
+ case IPPROTO_L2TP:
+ ret = l2tp_ip_mt(skb, par);
+ break;
+ default:
+ return false;
+ }
+
+ return ret;
+}
+
+static bool l2tp_mt4(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct iphdr *iph = ip_hdr(skb);
+ u8 ipproto = iph->protocol;
+
+ return l2tp_mt_common(skb, par, ipproto);
+}
+
+static bool l2tp_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ u8 ipproto = ip6h->nexthdr;
+
+ return l2tp_mt_common(skb, par, ipproto);
+}
+
+static int l2tp_mt_check(const struct xt_mtchk_param *par)
+{
+ struct xt_l2tp_info *info = par->matchinfo;
+
+ /* Check for invalid flags */
+ if (info->flags & ~(XT_L2TP_TID | XT_L2TP_SID | XT_L2TP_VERSION |
+ XT_L2TP_ENCAP | XT_L2TP_TYPE))
+ return -EINVAL;
+
+ /* At least one of tid, sid or type=control must be specified */
+ if ((!(info->flags & XT_L2TP_TID)) &&
+ (!(info->flags & XT_L2TP_SID)) &&
+ ((!(info->flags & XT_L2TP_TYPE)) ||
+ (info->type != XT_L2TP_TYPE_CONTROL)))
+ return -EINVAL;
+
+ /* If version 2 is specified, check that incompatible params
+ * are not supplied
+ */
+ if (info->flags & XT_L2TP_VERSION) {
+ if ((info->version < 2) || (info->version > 3))
+ return -EINVAL;
+
+ if (info->version == 2) {
+ if ((info->flags & XT_L2TP_TID) &&
+ (info->tid > 0xffff))
+ return -EINVAL;
+ if ((info->flags & XT_L2TP_SID) &&
+ (info->sid > 0xffff))
+ return -EINVAL;
+ if ((info->flags & XT_L2TP_ENCAP) &&
+ (info->encap == XT_L2TP_ENCAP_IP))
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static struct xt_match l2tp_mt_reg[] __read_mostly = {
+ {
+ .name = "l2tp",
+ .revision = 0,
+ .family = NFPROTO_IPV4,
+ .match = l2tp_mt4,
+ .matchsize = XT_ALIGN(sizeof(struct xt_l2tp_info)),
+ .checkentry = l2tp_mt_check,
+ .hooks = ((1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_FORWARD)),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "l2tp",
+ .revision = 0,
+ .family = NFPROTO_IPV6,
+ .match = l2tp_mt6,
+ .matchsize = XT_ALIGN(sizeof(struct xt_l2tp_info)),
+ .checkentry = l2tp_mt_check,
+ .hooks = ((1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_FORWARD)),
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init l2tp_mt_init(void)
+{
+ return xt_register_matches(&l2tp_mt_reg[0], ARRAY_SIZE(l2tp_mt_reg));
+}
+
+static void __exit l2tp_mt_exit(void)
+{
+ xt_unregister_matches(&l2tp_mt_reg[0], ARRAY_SIZE(l2tp_mt_reg));
+}
+
+module_init(l2tp_mt_init);
+module_exit(l2tp_mt_exit);
--
1.7.0.4
--
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