Initial import

1 files changed, 226 insertions, 0 deletions

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
new file mode 100644
index 000000000..d8214cb88
--- /dev/null
+++ b/include/net/ip_tunnels.h
@@ -0,0 +1,226 @@
+#ifndef __NET_IP_TUNNELS_H
+#define __NET_IP_TUNNELS_H 1
+
+#include <linux/if_tunnel.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/u64_stats_sync.h>
+#include <net/dsfield.h>
+#include <net/gro_cells.h>
+#include <net/inet_ecn.h>
+#include <net/ip.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#endif
+
+/* Keep error state on tunnel for 30 sec */
+#define IPTUNNEL_ERR_TIMEO	(30*HZ)
+
+/* 6rd prefix/relay information */
+#ifdef CONFIG_IPV6_SIT_6RD
+struct ip_tunnel_6rd_parm {
+	struct in6_addr		prefix;
+	__be32			relay_prefix;
+	u16			prefixlen;
+	u16			relay_prefixlen;
+};
+#endif
+
+struct ip_tunnel_encap {
+	__u16			type;
+	__u16			flags;
+	__be16			sport;
+	__be16			dport;
+};
+
+struct ip_tunnel_prl_entry {
+	struct ip_tunnel_prl_entry __rcu *next;
+	__be32				addr;
+	u16				flags;
+	struct rcu_head			rcu_head;
+};
+
+struct ip_tunnel_dst {
+	struct dst_entry __rcu 		*dst;
+	__be32				 saddr;
+};
+
+struct ip_tunnel {
+	struct ip_tunnel __rcu	*next;
+	struct hlist_node hash_node;
+	struct net_device	*dev;
+	struct net		*net;	/* netns for packet i/o */
+
+	int		err_count;	/* Number of arrived ICMP errors */
+	unsigned long	err_time;	/* Time when the last ICMP error
+					 * arrived */
+
+	/* These four fields used only by GRE */
+	__u32		i_seqno;	/* The last seen seqno	*/
+	__u32		o_seqno;	/* The last output seqno */
+	int		tun_hlen;	/* Precalculated header length */
+	int		mlink;
+
+	struct ip_tunnel_dst __percpu *dst_cache;
+
+	struct ip_tunnel_parm parms;
+
+	int		encap_hlen;	/* Encap header length (FOU,GUE) */
+	struct ip_tunnel_encap encap;
+
+	int		hlen;		/* tun_hlen + encap_hlen */
+
+	/* for SIT */
+#ifdef CONFIG_IPV6_SIT_6RD
+	struct ip_tunnel_6rd_parm ip6rd;
+#endif
+	struct ip_tunnel_prl_entry __rcu *prl;	/* potential router list */
+	unsigned int		prl_count;	/* # of entries in PRL */
+	int			ip_tnl_net_id;
+	struct gro_cells	gro_cells;
+};
+
+#define TUNNEL_CSUM		__cpu_to_be16(0x01)
+#define TUNNEL_ROUTING		__cpu_to_be16(0x02)
+#define TUNNEL_KEY		__cpu_to_be16(0x04)
+#define TUNNEL_SEQ		__cpu_to_be16(0x08)
+#define TUNNEL_STRICT		__cpu_to_be16(0x10)
+#define TUNNEL_REC		__cpu_to_be16(0x20)
+#define TUNNEL_VERSION		__cpu_to_be16(0x40)
+#define TUNNEL_NO_KEY		__cpu_to_be16(0x80)
+#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
+#define TUNNEL_OAM		__cpu_to_be16(0x0200)
+#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)
+#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)
+#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000)
+
+#define TUNNEL_OPTIONS_PRESENT	(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
+
+struct tnl_ptk_info {
+	__be16 flags;
+	__be16 proto;
+	__be32 key;
+	__be32 seq;
+};
+
+#define PACKET_RCVD	0
+#define PACKET_REJECT	1
+
+#define IP_TNL_HASH_BITS   7
+#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)
+
+struct ip_tunnel_net {
+	struct net_device *fb_tunnel_dev;
+	struct hlist_head tunnels[IP_TNL_HASH_SIZE];
+};
+
+struct ip_tunnel_encap_ops {
+	size_t (*encap_hlen)(struct ip_tunnel_encap *e);
+	int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
+			    u8 *protocol, struct flowi4 *fl4);
+};
+
+#define MAX_IPTUN_ENCAP_OPS 8
+
+extern const struct ip_tunnel_encap_ops __rcu *
+		iptun_encaps[MAX_IPTUN_ENCAP_OPS];
+
+int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
+			    unsigned int num);
+int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
+			    unsigned int num);
+
+#ifdef CONFIG_INET
+
+int ip_tunnel_init(struct net_device *dev);
+void ip_tunnel_uninit(struct net_device *dev);
+void  ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
+struct net *ip_tunnel_get_link_net(const struct net_device *dev);
+int ip_tunnel_get_iflink(const struct net_device *dev);
+int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
+		       struct rtnl_link_ops *ops, char *devname);
+
+void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
+
+void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
+		    const struct iphdr *tnl_params, const u8 protocol);
+int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
+int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
+		    u8 *protocol, struct flowi4 *fl4);
+int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
+
+struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
+						struct rtnl_link_stats64 *tot);
+struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
+				   int link, __be16 flags,
+				   __be32 remote, __be32 local,
+				   __be32 key);
+
+int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
+		  const struct tnl_ptk_info *tpi, bool log_ecn_error);
+int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
+			 struct ip_tunnel_parm *p);
+int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
+		      struct ip_tunnel_parm *p);
+void ip_tunnel_setup(struct net_device *dev, int net_id);
+void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
+int ip_tunnel_encap_setup(struct ip_tunnel *t,
+			  struct ip_tunnel_encap *ipencap);
+
+/* Extract dsfield from inner protocol */
+static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
+				       const struct sk_buff *skb)
+{
+	if (skb->protocol == htons(ETH_P_IP))
+		return iph->tos;
+	else if (skb->protocol == htons(ETH_P_IPV6))
+		return ipv6_get_dsfield((const struct ipv6hdr *)iph);
+	else
+		return 0;
+}
+
+/* Propogate ECN bits out */
+static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
+				     const struct sk_buff *skb)
+{
+	u8 inner = ip_tunnel_get_dsfield(iph, skb);
+
+	return INET_ECN_encapsulate(tos, inner);
+}
+
+int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
+int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
+		  __be32 src, __be32 dst, __u8 proto,
+		  __u8 tos, __u8 ttl, __be16 df, bool xnet);
+
+struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
+					 int gso_type_mask);
+
+static inline void iptunnel_xmit_stats(int err,
+				       struct net_device_stats *err_stats,
+				       struct pcpu_sw_netstats __percpu *stats)
+{
+	if (err > 0) {
+		struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
+
+		u64_stats_update_begin(&tstats->syncp);
+		tstats->tx_bytes += err;
+		tstats->tx_packets++;
+		u64_stats_update_end(&tstats->syncp);
+	} else if (err < 0) {
+		err_stats->tx_errors++;
+		err_stats->tx_aborted_errors++;
+	} else {
+		err_stats->tx_dropped++;
+	}
+}
+
+#endif /* CONFIG_INET */
+
+#endif /* __NET_IP_TUNNELS_H */