1 #ifndef __NET_IP_TUNNELS_H
2 #define __NET_IP_TUNNELS_H 1
4 #include <linux/if_tunnel.h>
5 #include <linux/netdevice.h>
6 #include <linux/skbuff.h>
7 #include <linux/types.h>
8 #include <linux/u64_stats_sync.h>
9 #include <net/dsfield.h>
10 #include <net/gro_cells.h>
11 #include <net/inet_ecn.h>
12 #include <net/netns/generic.h>
13 #include <net/rtnetlink.h>
14 #include <net/lwtunnel.h>
16 #if IS_ENABLED(CONFIG_IPV6)
18 #include <net/ip6_fib.h>
19 #include <net/ip6_route.h>
22 /* Keep error state on tunnel for 30 sec */
23 #define IPTUNNEL_ERR_TIMEO (30*HZ)
25 /* Used to memset ip_tunnel padding. */
26 #define IP_TUNNEL_KEY_SIZE \
27 (offsetof(struct ip_tunnel_key, tp_dst) + \
28 FIELD_SIZEOF(struct ip_tunnel_key, tp_dst))
30 struct ip_tunnel_key {
39 } __packed __aligned(4); /* Minimize padding. */
41 /* Indicates whether the tunnel info structure represents receive
42 * or transmit tunnel parameters.
49 struct ip_tunnel_info {
50 struct ip_tunnel_key key;
56 /* 6rd prefix/relay information */
57 #ifdef CONFIG_IPV6_SIT_6RD
58 struct ip_tunnel_6rd_parm {
59 struct in6_addr prefix;
66 struct ip_tunnel_encap {
73 struct ip_tunnel_prl_entry {
74 struct ip_tunnel_prl_entry __rcu *next;
77 struct rcu_head rcu_head;
80 struct ip_tunnel_dst {
81 struct dst_entry __rcu *dst;
86 struct ip_tunnel __rcu *next;
87 struct hlist_node hash_node;
88 struct net_device *dev;
89 struct net *net; /* netns for packet i/o */
91 int err_count; /* Number of arrived ICMP errors */
92 unsigned long err_time; /* Time when the last ICMP error
95 /* These four fields used only by GRE */
96 __u32 i_seqno; /* The last seen seqno */
97 __u32 o_seqno; /* The last output seqno */
98 int tun_hlen; /* Precalculated header length */
101 struct ip_tunnel_dst __percpu *dst_cache;
103 struct ip_tunnel_parm parms;
105 int encap_hlen; /* Encap header length (FOU,GUE) */
106 struct ip_tunnel_encap encap;
108 int hlen; /* tun_hlen + encap_hlen */
111 #ifdef CONFIG_IPV6_SIT_6RD
112 struct ip_tunnel_6rd_parm ip6rd;
114 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
115 unsigned int prl_count; /* # of entries in PRL */
117 struct gro_cells gro_cells;
120 #define TUNNEL_CSUM __cpu_to_be16(0x01)
121 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
122 #define TUNNEL_KEY __cpu_to_be16(0x04)
123 #define TUNNEL_SEQ __cpu_to_be16(0x08)
124 #define TUNNEL_STRICT __cpu_to_be16(0x10)
125 #define TUNNEL_REC __cpu_to_be16(0x20)
126 #define TUNNEL_VERSION __cpu_to_be16(0x40)
127 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
128 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
129 #define TUNNEL_OAM __cpu_to_be16(0x0200)
130 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
131 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
132 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
134 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
136 struct tnl_ptk_info {
143 #define PACKET_RCVD 0
144 #define PACKET_REJECT 1
146 #define IP_TNL_HASH_BITS 7
147 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
149 struct ip_tunnel_net {
150 struct net_device *fb_tunnel_dev;
151 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
154 struct ip_tunnel_encap_ops {
155 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
156 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
157 u8 *protocol, struct flowi4 *fl4);
160 #define MAX_IPTUN_ENCAP_OPS 8
162 extern const struct ip_tunnel_encap_ops __rcu *
163 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
165 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
167 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
170 static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
171 __be32 saddr, __be32 daddr,
173 __be16 tp_src, __be16 tp_dst,
174 __be64 tun_id, __be16 tun_flags,
175 const void *opts, u8 opts_len)
177 tun_info->key.tun_id = tun_id;
178 tun_info->key.ipv4_src = saddr;
179 tun_info->key.ipv4_dst = daddr;
180 tun_info->key.ipv4_tos = tos;
181 tun_info->key.ipv4_ttl = ttl;
182 tun_info->key.tun_flags = tun_flags;
184 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
185 * the upper tunnel are used.
186 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
188 tun_info->key.tp_src = tp_src;
189 tun_info->key.tp_dst = tp_dst;
191 /* Clear struct padding. */
192 if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE)
193 memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE,
194 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE);
196 tun_info->options = opts;
197 tun_info->options_len = opts_len;
200 static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
201 const struct iphdr *iph,
202 __be16 tp_src, __be16 tp_dst,
203 __be64 tun_id, __be16 tun_flags,
204 const void *opts, u8 opts_len)
206 __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr,
207 iph->tos, iph->ttl, tp_src, tp_dst,
208 tun_id, tun_flags, opts, opts_len);
213 int ip_tunnel_init(struct net_device *dev);
214 void ip_tunnel_uninit(struct net_device *dev);
215 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
216 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
217 int ip_tunnel_get_iflink(const struct net_device *dev);
218 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
219 struct rtnl_link_ops *ops, char *devname);
221 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
223 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
224 const struct iphdr *tnl_params, const u8 protocol);
225 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
226 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
227 u8 *protocol, struct flowi4 *fl4);
228 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
230 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
231 struct rtnl_link_stats64 *tot);
232 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
233 int link, __be16 flags,
234 __be32 remote, __be32 local,
237 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
238 const struct tnl_ptk_info *tpi, bool log_ecn_error);
239 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
240 struct ip_tunnel_parm *p);
241 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
242 struct ip_tunnel_parm *p);
243 void ip_tunnel_setup(struct net_device *dev, int net_id);
244 void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
245 int ip_tunnel_encap_setup(struct ip_tunnel *t,
246 struct ip_tunnel_encap *ipencap);
248 /* Extract dsfield from inner protocol */
249 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
250 const struct sk_buff *skb)
252 if (skb->protocol == htons(ETH_P_IP))
254 else if (skb->protocol == htons(ETH_P_IPV6))
255 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
260 /* Propogate ECN bits out */
261 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
262 const struct sk_buff *skb)
264 u8 inner = ip_tunnel_get_dsfield(iph, skb);
266 return INET_ECN_encapsulate(tos, inner);
269 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
270 int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
271 __be32 src, __be32 dst, __u8 proto,
272 __u8 tos, __u8 ttl, __be16 df, bool xnet);
274 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
277 static inline void iptunnel_xmit_stats(int err,
278 struct net_device_stats *err_stats,
279 struct pcpu_sw_netstats __percpu *stats)
282 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
284 u64_stats_update_begin(&tstats->syncp);
285 tstats->tx_bytes += err;
286 tstats->tx_packets++;
287 u64_stats_update_end(&tstats->syncp);
288 } else if (err < 0) {
289 err_stats->tx_errors++;
290 err_stats->tx_aborted_errors++;
292 err_stats->tx_dropped++;
296 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n)
301 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
303 return (struct ip_tunnel_info *)lwtstate->data;
306 extern struct static_key ip_tunnel_metadata_cnt;
308 /* Returns > 0 if metadata should be collected */
309 static inline int ip_tunnel_collect_metadata(void)
311 return static_key_false(&ip_tunnel_metadata_cnt);
314 void __init ip_tunnel_core_init(void);
316 void ip_tunnel_need_metadata(void);
317 void ip_tunnel_unneed_metadata(void);
319 #else /* CONFIG_INET */
321 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
326 static inline void ip_tunnel_need_metadata(void)
330 static inline void ip_tunnel_unneed_metadata(void)
334 #endif /* CONFIG_INET */
336 #endif /* __NET_IP_TUNNELS_H */