190 lines
5.1 KiB
C
190 lines
5.1 KiB
C
#ifndef __NET_IP_TUNNELS_H
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#define __NET_IP_TUNNELS_H 1
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#include <linux/if_tunnel.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/u64_stats_sync.h>
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#include <net/dsfield.h>
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#include <net/gro_cells.h>
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#include <net/inet_ecn.h>
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#include <net/ip.h>
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#include <net/rtnetlink.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
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#endif
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/* Keep error state on tunnel for 30 sec */
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#define IPTUNNEL_ERR_TIMEO (30*HZ)
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/* 6rd prefix/relay information */
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#ifdef CONFIG_IPV6_SIT_6RD
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struct ip_tunnel_6rd_parm {
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struct in6_addr prefix;
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__be32 relay_prefix;
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u16 prefixlen;
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u16 relay_prefixlen;
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};
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#endif
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struct ip_tunnel_prl_entry {
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struct ip_tunnel_prl_entry __rcu *next;
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__be32 addr;
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u16 flags;
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struct rcu_head rcu_head;
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};
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struct ip_tunnel {
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struct ip_tunnel __rcu *next;
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struct hlist_node hash_node;
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struct net_device *dev;
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struct net *net; /* netns for packet i/o */
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int err_count; /* Number of arrived ICMP errors */
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unsigned long err_time; /* Time when the last ICMP error
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* arrived */
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/* These four fields used only by GRE */
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__u32 i_seqno; /* The last seen seqno */
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__u32 o_seqno; /* The last output seqno */
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int hlen; /* Precalculated header length */
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int mlink;
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struct ip_tunnel_parm parms;
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/* for SIT */
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#ifdef CONFIG_IPV6_SIT_6RD
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struct ip_tunnel_6rd_parm ip6rd;
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#endif
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struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
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unsigned int prl_count; /* # of entries in PRL */
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int ip_tnl_net_id;
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struct gro_cells gro_cells;
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};
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#define TUNNEL_CSUM __cpu_to_be16(0x01)
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#define TUNNEL_ROUTING __cpu_to_be16(0x02)
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#define TUNNEL_KEY __cpu_to_be16(0x04)
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#define TUNNEL_SEQ __cpu_to_be16(0x08)
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#define TUNNEL_STRICT __cpu_to_be16(0x10)
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#define TUNNEL_REC __cpu_to_be16(0x20)
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#define TUNNEL_VERSION __cpu_to_be16(0x40)
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#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
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#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
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struct tnl_ptk_info {
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__be16 flags;
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__be16 proto;
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__be32 key;
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__be32 seq;
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};
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#define PACKET_RCVD 0
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#define PACKET_REJECT 1
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#define IP_TNL_HASH_BITS 10
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#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
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struct ip_tunnel_net {
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struct hlist_head *tunnels;
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struct net_device *fb_tunnel_dev;
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};
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#ifdef CONFIG_INET
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int ip_tunnel_init(struct net_device *dev);
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void ip_tunnel_uninit(struct net_device *dev);
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void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
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int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
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struct rtnl_link_ops *ops, char *devname);
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void ip_tunnel_delete_net(struct ip_tunnel_net *itn);
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void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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const struct iphdr *tnl_params, const u8 protocol);
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int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
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int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
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struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot);
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struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
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int link, __be16 flags,
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__be32 remote, __be32 local,
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__be32 key);
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int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
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const struct tnl_ptk_info *tpi, bool log_ecn_error);
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int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
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struct ip_tunnel_parm *p);
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int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
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struct ip_tunnel_parm *p);
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void ip_tunnel_setup(struct net_device *dev, int net_id);
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/* Extract dsfield from inner protocol */
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static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
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const struct sk_buff *skb)
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{
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if (skb->protocol == htons(ETH_P_IP))
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return iph->tos;
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else if (skb->protocol == htons(ETH_P_IPV6))
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return ipv6_get_dsfield((const struct ipv6hdr *)iph);
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else
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return 0;
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}
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/* Propogate ECN bits out */
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static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
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const struct sk_buff *skb)
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{
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u8 inner = ip_tunnel_get_dsfield(iph, skb);
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return INET_ECN_encapsulate(tos, inner);
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}
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static inline void tunnel_ip_select_ident(struct sk_buff *skb,
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const struct iphdr *old_iph,
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struct dst_entry *dst)
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{
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struct iphdr *iph = ip_hdr(skb);
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/* Use inner packet iph-id if possible. */
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if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
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iph->id = old_iph->id;
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else
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__ip_select_ident(iph, dst,
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(skb_shinfo(skb)->gso_segs ?: 1) - 1);
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}
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int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
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int iptunnel_xmit(struct net *net, struct rtable *rt,
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struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 proto,
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__u8 tos, __u8 ttl, __be16 df);
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static inline void iptunnel_xmit_stats(int err,
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struct net_device_stats *err_stats,
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struct pcpu_tstats __percpu *stats)
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{
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if (err > 0) {
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struct pcpu_tstats *tstats = this_cpu_ptr(stats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->tx_bytes += err;
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tstats->tx_packets++;
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u64_stats_update_end(&tstats->syncp);
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} else if (err < 0) {
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err_stats->tx_errors++;
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err_stats->tx_aborted_errors++;
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} else {
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err_stats->tx_dropped++;
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}
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}
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#endif /* CONFIG_INET */
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#endif /* __NET_IP_TUNNELS_H */
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