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/socket.h>
8 #include <linux/types.h>
9 #include <linux/u64_stats_sync.h>
10 #include <net/dsfield.h>
11 #include <net/gro_cells.h>
12 #include <net/inet_ecn.h>
13 #include <net/netns/generic.h>
14 #include <net/rtnetlink.h>
15 #include <net/lwtunnel.h>
17 #if IS_ENABLED(CONFIG_IPV6)
19 #include <net/ip6_fib.h>
20 #include <net/ip6_route.h>
23 /* Keep error state on tunnel for 30 sec */
24 #define IPTUNNEL_ERR_TIMEO (30*HZ)
26 /* Used to memset ip_tunnel padding. */
27 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
29 /* Used to memset ipv4 address padding. */
30 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
31 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \
32 (FIELD_SIZEOF(struct ip_tunnel_key, u) - \
33 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
35 struct ip_tunnel_key {
48 u8 tos; /* TOS for IPv4, TC for IPv6 */
49 u8 ttl; /* TTL for IPv4, HL for IPv6 */
54 /* Flags for ip_tunnel_info mode. */
55 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
56 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
58 struct ip_tunnel_info {
59 struct ip_tunnel_key key;
65 /* 6rd prefix/relay information */
66 #ifdef CONFIG_IPV6_SIT_6RD
67 struct ip_tunnel_6rd_parm {
68 struct in6_addr prefix;
75 struct ip_tunnel_encap {
82 struct ip_tunnel_prl_entry {
83 struct ip_tunnel_prl_entry __rcu *next;
86 struct rcu_head rcu_head;
89 struct ip_tunnel_dst {
90 struct dst_entry __rcu *dst;
97 struct ip_tunnel __rcu *next;
98 struct hlist_node hash_node;
99 struct net_device *dev;
100 struct net *net; /* netns for packet i/o */
102 int err_count; /* Number of arrived ICMP errors */
103 unsigned long err_time; /* Time when the last ICMP error
106 /* These four fields used only by GRE */
107 u32 i_seqno; /* The last seen seqno */
108 u32 o_seqno; /* The last output seqno */
109 int tun_hlen; /* Precalculated header length */
112 struct ip_tunnel_dst __percpu *dst_cache;
114 struct ip_tunnel_parm parms;
116 int encap_hlen; /* Encap header length (FOU,GUE) */
117 struct ip_tunnel_encap encap;
119 int hlen; /* tun_hlen + encap_hlen */
122 #ifdef CONFIG_IPV6_SIT_6RD
123 struct ip_tunnel_6rd_parm ip6rd;
125 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
126 unsigned int prl_count; /* # of entries in PRL */
128 struct gro_cells gro_cells;
132 #define TUNNEL_CSUM __cpu_to_be16(0x01)
133 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
134 #define TUNNEL_KEY __cpu_to_be16(0x04)
135 #define TUNNEL_SEQ __cpu_to_be16(0x08)
136 #define TUNNEL_STRICT __cpu_to_be16(0x10)
137 #define TUNNEL_REC __cpu_to_be16(0x20)
138 #define TUNNEL_VERSION __cpu_to_be16(0x40)
139 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
140 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
141 #define TUNNEL_OAM __cpu_to_be16(0x0200)
142 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
143 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
144 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
146 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
148 struct tnl_ptk_info {
155 #define PACKET_RCVD 0
156 #define PACKET_REJECT 1
158 #define IP_TNL_HASH_BITS 7
159 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
161 struct ip_tunnel_net {
162 struct net_device *fb_tunnel_dev;
163 struct hlist_head tunnels[IP_TNL_HASH_SIZE];
164 struct ip_tunnel __rcu *collect_md_tun;
167 struct ip_tunnel_encap_ops {
168 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
169 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
170 u8 *protocol, struct flowi4 *fl4);
173 #define MAX_IPTUN_ENCAP_OPS 8
175 extern const struct ip_tunnel_encap_ops __rcu *
176 iptun_encaps[MAX_IPTUN_ENCAP_OPS];
178 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
180 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
183 static inline void __ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
184 __be32 saddr, __be32 daddr,
186 __be16 tp_src, __be16 tp_dst,
187 __be64 tun_id, __be16 tun_flags,
188 const void *opts, u8 opts_len)
190 tun_info->key.tun_id = tun_id;
191 tun_info->key.u.ipv4.src = saddr;
192 tun_info->key.u.ipv4.dst = daddr;
193 memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD,
194 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
195 tun_info->key.tos = tos;
196 tun_info->key.ttl = ttl;
197 tun_info->key.tun_flags = tun_flags;
199 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
200 * the upper tunnel are used.
201 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
203 tun_info->key.tp_src = tp_src;
204 tun_info->key.tp_dst = tp_dst;
206 /* Clear struct padding. */
207 if (sizeof(tun_info->key) != IP_TUNNEL_KEY_SIZE)
208 memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_SIZE,
209 0, sizeof(tun_info->key) - IP_TUNNEL_KEY_SIZE);
211 tun_info->options = opts;
212 tun_info->options_len = opts_len;
217 static inline void ip_tunnel_info_init(struct ip_tunnel_info *tun_info,
218 const struct iphdr *iph,
219 __be16 tp_src, __be16 tp_dst,
220 __be64 tun_id, __be16 tun_flags,
221 const void *opts, u8 opts_len)
223 __ip_tunnel_info_init(tun_info, iph->saddr, iph->daddr,
224 iph->tos, iph->ttl, tp_src, tp_dst,
225 tun_id, tun_flags, opts, opts_len);
228 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
231 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
236 int ip_tunnel_init(struct net_device *dev);
237 void ip_tunnel_uninit(struct net_device *dev);
238 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
239 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
240 int ip_tunnel_get_iflink(const struct net_device *dev);
241 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
242 struct rtnl_link_ops *ops, char *devname);
244 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
246 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
247 const struct iphdr *tnl_params, const u8 protocol);
248 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
249 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
250 u8 *protocol, struct flowi4 *fl4);
251 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
253 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
254 struct rtnl_link_stats64 *tot);
255 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
256 int link, __be16 flags,
257 __be32 remote, __be32 local,
260 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
261 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
263 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
264 struct ip_tunnel_parm *p);
265 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
266 struct ip_tunnel_parm *p);
267 void ip_tunnel_setup(struct net_device *dev, int net_id);
268 void ip_tunnel_dst_reset_all(struct ip_tunnel *t);
269 int ip_tunnel_encap_setup(struct ip_tunnel *t,
270 struct ip_tunnel_encap *ipencap);
272 /* Extract dsfield from inner protocol */
273 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
274 const struct sk_buff *skb)
276 if (skb->protocol == htons(ETH_P_IP))
278 else if (skb->protocol == htons(ETH_P_IPV6))
279 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
284 /* Propogate ECN bits out */
285 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
286 const struct sk_buff *skb)
288 u8 inner = ip_tunnel_get_dsfield(iph, skb);
290 return INET_ECN_encapsulate(tos, inner);
293 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
294 int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
295 __be32 src, __be32 dst, u8 proto,
296 u8 tos, u8 ttl, __be16 df, bool xnet);
298 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum,
301 static inline void iptunnel_xmit_stats(int err,
302 struct net_device_stats *err_stats,
303 struct pcpu_sw_netstats __percpu *stats)
306 struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats);
308 u64_stats_update_begin(&tstats->syncp);
309 tstats->tx_bytes += err;
310 tstats->tx_packets++;
311 u64_stats_update_end(&tstats->syncp);
312 } else if (err < 0) {
313 err_stats->tx_errors++;
314 err_stats->tx_aborted_errors++;
316 err_stats->tx_dropped++;
320 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info, size_t n)
325 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
327 return (struct ip_tunnel_info *)lwtstate->data;
330 extern struct static_key ip_tunnel_metadata_cnt;
332 /* Returns > 0 if metadata should be collected */
333 static inline int ip_tunnel_collect_metadata(void)
335 return static_key_false(&ip_tunnel_metadata_cnt);
338 void __init ip_tunnel_core_init(void);
340 void ip_tunnel_need_metadata(void);
341 void ip_tunnel_unneed_metadata(void);
343 #else /* CONFIG_INET */
345 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
350 static inline void ip_tunnel_need_metadata(void)
354 static inline void ip_tunnel_unneed_metadata(void)
358 #endif /* CONFIG_INET */
360 #endif /* __NET_IP_TUNNELS_H */