Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) BPF debugger and asm tool by Daniel Borkmann.

 2) Speed up create/bind in AF_PACKET, also from Daniel Borkmann.

 3) Correct reciprocal_divide and update users, from Hannes Frederic
    Sowa and Daniel Borkmann.

 4) Currently we only have a "set" operation for the hw timestamp socket
    ioctl, add a "get" operation to match.  From Ben Hutchings.

 5) Add better trace events for debugging driver datapath problems, also
    from Ben Hutchings.

 6) Implement auto corking in TCP, from Eric Dumazet.  Basically, if we
    have a small send and a previous packet is already in the qdisc or
    device queue, defer until TX completion or we get more data.

 7) Allow userspace to manage ipv6 temporary addresses, from Jiri Pirko.

 8) Add a qdisc bypass option for AF_PACKET sockets, from Daniel
    Borkmann.

 9) Share IP header compression code between Bluetooth and IEEE802154
    layers, from Jukka Rissanen.

10) Fix ipv6 router reachability probing, from Jiri Benc.

11) Allow packets to be captured on macvtap devices, from Vlad Yasevich.

12) Support tunneling in GRO layer, from Jerry Chu.

13) Allow bonding to be configured fully using netlink, from Scott
    Feldman.

14) Allow AF_PACKET users to obtain the VLAN TPID, just like they can
    already get the TCI.  From Atzm Watanabe.

15) New "Heavy Hitter" qdisc, from Terry Lam.

16) Significantly improve the IPSEC support in pktgen, from Fan Du.

17) Allow ipv4 tunnels to cache routes, just like sockets.  From Tom
    Herbert.

18) Add Proportional Integral Enhanced packet scheduler, from Vijay
    Subramanian.

19) Allow openvswitch to mmap'd netlink, from Thomas Graf.

20) Key TCP metrics blobs also by source address, not just destination
    address.  From Christoph Paasch.

21) Support 10G in generic phylib.  From Andy Fleming.

22) Try to short-circuit GRO flow compares using device provided RX
    hash, if provided.  From Tom Herbert.

The wireless and netfilter folks have been busy little bees too.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (2064 commits)
  net/cxgb4: Fix referencing freed adapter
  ipv6: reallocate addrconf router for ipv6 address when lo device up
  fib_frontend: fix possible NULL pointer dereference
  rtnetlink: remove IFLA_BOND_SLAVE definition
  rtnetlink: remove check for fill_slave_info in rtnl_have_link_slave_info
  qlcnic: update version to 5.3.55
  qlcnic: Enhance logic to calculate msix vectors.
  qlcnic: Refactor interrupt coalescing code for all adapters.
  qlcnic: Update poll controller code path
  qlcnic: Interrupt code cleanup
  qlcnic: Enhance Tx timeout debugging.
  qlcnic: Use bool for rx_mac_learn.
  bonding: fix u64 division
  rtnetlink: add missing IFLA_BOND_AD_INFO_UNSPEC
  sfc: Use the correct maximum TX DMA ring size for SFC9100
  Add Shradha Shah as the sfc driver maintainer.
  net/vxlan: Share RX skb de-marking and checksum checks with ovs
  tulip: cleanup by using ARRAY_SIZE()
  ip_tunnel: clear IPCB in ip_tunnel_xmit() in case dst_link_failure() is called
  net/cxgb4: Don't retrieve stats during recovery
  ...

1 files changed, 354 insertions, 0 deletions

diff --git a/net/netfilter/xt_l2tp.c b/net/netfilter/xt_l2tp.c
new file mode 100644
index 000000000000..8aee572771f2
--- /dev/null
+++ b/net/netfilter/xt_l2tp.c
@@ -0,0 +1,354 @@
+/* Kernel module to match L2TP header parameters. */
+
+/* (C) 2013      James Chapman <jchapman@katalix.com>
+ *
+ * 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_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_tcpudp.h>
+#include <linux/netfilter/xt_l2tp.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@katalix.com>");
+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;
+};
+
+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_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. Note the L2TPv3 control and data packets have a
+ * different format. See
+ * RFC2661, Section 3.1, L2TPv2 Header Format
+ * RFC3931, Section 3.2.1, L2TPv3 Control Message Header
+ * RFC3931, Section 3.2.2, L2TPv3 Data Message Header
+ * RFC3931, Section 4.1.2.1, L2TPv3 Session Header over UDP
+ */
+static bool l2tp_udp_mt(const struct sk_buff *skb, struct xt_action_param *par, u16 thoff)
+{
+	const struct xt_l2tp_info *info = par->matchinfo;
+	int uhlen = sizeof(struct udphdr);
+	int offs = thoff + uhlen;
+	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;
+
+	return l2tp_match(info, &data);
+}
+
+/* Parse L2TP header fields for IP encapsulation (no UDP header).
+ * L2TPv3 data packets have a different form with IP encap. See
+ * RC3931, Section 4.1.1.1, L2TPv3 Session Header over IP.
+ * RC3931, Section 4.1.1.2, L2TPv3 Control and Data Traffic over IP.
+ */
+static bool l2tp_ip_mt(const struct sk_buff *skb, struct xt_action_param *par, u16 thoff)
+{
+	const struct xt_l2tp_info *info = par->matchinfo;
+	union l2tp_val *lh;
+	union l2tp_val lhbuf;
+	struct l2tp_data data = { 0, };
+
+	/* For IP encap, the L2TP sid is the first 32-bits. */
+	lh = skb_header_pointer(skb, 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, 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;
+
+	return l2tp_match(info, &data);
+}
+
+static bool l2tp_mt4(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	struct iphdr *iph = ip_hdr(skb);
+	u8 ipproto = iph->protocol;
+
+	/* l2tp_mt_check4 already restricts the transport protocol */
+	switch (ipproto) {
+	case IPPROTO_UDP:
+		return l2tp_udp_mt(skb, par, par->thoff);
+	case IPPROTO_L2TP:
+		return l2tp_ip_mt(skb, par, par->thoff);
+	}
+
+	return false;
+}
+
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
+static bool l2tp_mt6(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	unsigned int thoff = 0;
+	unsigned short fragoff = 0;
+	int ipproto;
+
+	ipproto = ipv6_find_hdr(skb, &thoff, -1, &fragoff, NULL);
+	if (fragoff != 0)
+		return false;
+
+	/* l2tp_mt_check6 already restricts the transport protocol */
+	switch (ipproto) {
+	case IPPROTO_UDP:
+		return l2tp_udp_mt(skb, par, thoff);
+	case IPPROTO_L2TP:
+		return l2tp_ip_mt(skb, par, thoff);
+	}
+
+	return false;
+}
+#endif
+
+static int l2tp_mt_check(const struct xt_mtchk_param *par)
+{
+	const 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_TYPE)) {
+		pr_info("unknown flags: %x\n", info->flags);
+		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))) {
+		pr_info("invalid flags combination: %x\n", info->flags);
+		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)) {
+			pr_info("wrong L2TP version: %u\n", info->version);
+			return -EINVAL;
+		}
+
+		if (info->version == 2) {
+			if ((info->flags & XT_L2TP_TID) &&
+			    (info->tid > 0xffff)) {
+				pr_info("v2 tid > 0xffff: %u\n", info->tid);
+				return -EINVAL;
+			}
+			if ((info->flags & XT_L2TP_SID) &&
+			    (info->sid > 0xffff)) {
+				pr_info("v2 sid > 0xffff: %u\n", info->sid);
+				return -EINVAL;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int l2tp_mt_check4(const struct xt_mtchk_param *par)
+{
+	const struct xt_l2tp_info *info = par->matchinfo;
+	const struct ipt_entry *e = par->entryinfo;
+	const struct ipt_ip *ip = &e->ip;
+	int ret;
+
+	ret = l2tp_mt_check(par);
+	if (ret != 0)
+		return ret;
+
+	if ((ip->proto != IPPROTO_UDP) &&
+	    (ip->proto != IPPROTO_L2TP)) {
+		pr_info("missing protocol rule (udp|l2tpip)\n");
+		return -EINVAL;
+	}
+
+	if ((ip->proto == IPPROTO_L2TP) &&
+	    (info->version == 2)) {
+		pr_info("v2 doesn't support IP mode\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
+static int l2tp_mt_check6(const struct xt_mtchk_param *par)
+{
+	const struct xt_l2tp_info *info = par->matchinfo;
+	const struct ip6t_entry *e = par->entryinfo;
+	const struct ip6t_ip6 *ip = &e->ipv6;
+	int ret;
+
+	ret = l2tp_mt_check(par);
+	if (ret != 0)
+		return ret;
+
+	if ((ip->proto != IPPROTO_UDP) &&
+	    (ip->proto != IPPROTO_L2TP)) {
+		pr_info("missing protocol rule (udp|l2tpip)\n");
+		return -EINVAL;
+	}
+
+	if ((ip->proto == IPPROTO_L2TP) &&
+	    (info->version == 2)) {
+		pr_info("v2 doesn't support IP mode\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+#endif
+
+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_check4,
+		.hooks     = ((1 << NF_INET_PRE_ROUTING) |
+			      (1 << NF_INET_LOCAL_IN) |
+			      (1 << NF_INET_LOCAL_OUT) |
+			      (1 << NF_INET_FORWARD)),
+		.me        = THIS_MODULE,
+	},
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
+	{
+		.name      = "l2tp",
+		.revision  = 0,
+		.family    = NFPROTO_IPV6,
+		.match     = l2tp_mt6,
+		.matchsize = XT_ALIGN(sizeof(struct xt_l2tp_info)),
+		.checkentry = l2tp_mt_check6,
+		.hooks     = ((1 << NF_INET_PRE_ROUTING) |
+			      (1 << NF_INET_LOCAL_IN) |
+			      (1 << NF_INET_LOCAL_OUT) |
+			      (1 << NF_INET_FORWARD)),
+		.me        = THIS_MODULE,
+	},
+#endif
+};
+
+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);