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>
16 #include <net/dst_cache.h>
18 #if IS_ENABLED(CONFIG_IPV6)
20 #include <net/ip6_fib.h>
21 #include <net/ip6_route.h>
24 /* Keep error state on tunnel for 30 sec */
25 #define IPTUNNEL_ERR_TIMEO (30*HZ)
27 /* Used to memset ip_tunnel padding. */
28 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
30 /* Used to memset ipv4 address padding. */
31 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
32 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \
33 (FIELD_SIZEOF(struct ip_tunnel_key, u) - \
34 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
36 struct ip_tunnel_key {
49 u8 tos; /* TOS for IPv4, TC for IPv6 */
50 u8 ttl; /* TTL for IPv4, HL for IPv6 */
51 __be32 label; /* Flow Label for IPv6 */
56 /* Flags for ip_tunnel_info mode. */
57 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
58 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
60 struct ip_tunnel_info {
61 struct ip_tunnel_key key;
62 #ifdef CONFIG_DST_CACHE
63 struct dst_cache dst_cache;
69 /* 6rd prefix/relay information */
70 #ifdef CONFIG_IPV6_SIT_6RD
71 struct ip_tunnel_6rd_parm {
72 struct in6_addr prefix;
79 struct ip_tunnel_encap {
86 struct ip_tunnel_prl_entry {
87 struct ip_tunnel_prl_entry __rcu *next;
90 struct rcu_head rcu_head;
96 struct ip_tunnel __rcu *next;
97 struct hlist_node hash_node;
98 struct net_device *dev;
99 struct net *net; /* netns for packet i/o */
101 int err_count; /* Number of arrived ICMP errors */
102 unsigned long err_time; /* Time when the last ICMP error
105 /* These four fields used only by GRE */
106 u32 i_seqno; /* The last seen seqno */
107 u32 o_seqno; /* The last output seqno */
108 int tun_hlen; /* Precalculated header length */
111 struct dst_cache dst_cache;
113 struct ip_tunnel_parm parms;
115 int encap_hlen; /* Encap header length (FOU,GUE) */
116 struct ip_tunnel_encap encap;
118 int hlen; /* tun_hlen + encap_hlen */
121 #ifdef CONFIG_IPV6_SIT_6RD
122 struct ip_tunnel_6rd_parm ip6rd;
124 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
125 unsigned int prl_count; /* # of entries in PRL */
127 struct gro_cells gro_cells;
131 #define TUNNEL_CSUM __cpu_to_be16(0x01)
132 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
133 #define TUNNEL_KEY __cpu_to_be16(0x04)
134 #define TUNNEL_SEQ __cpu_to_be16(0x08)
135 #define TUNNEL_STRICT __cpu_to_be16(0x10)
136 #define TUNNEL_REC __cpu_to_be16(0x20)
137 #define TUNNEL_VERSION __cpu_to_be16(0x40)
138 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
139 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
140 #define TUNNEL_OAM __cpu_to_be16(0x0200)
141 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
142 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
143 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
144 #define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
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_key_init(struct ip_tunnel_key *key,
184 __be32 saddr, __be32 daddr,
185 u8 tos, u8 ttl, __be32 label,
186 __be16 tp_src, __be16 tp_dst,
187 __be64 tun_id, __be16 tun_flags)
189 key->tun_id = tun_id;
190 key->u.ipv4.src = saddr;
191 key->u.ipv4.dst = daddr;
192 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
193 0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
197 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 key->tp_src = tp_src;
204 key->tp_dst = tp_dst;
206 /* Clear struct padding. */
207 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
208 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
209 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
213 ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
214 const struct ip_tunnel_info *info)
220 if (info->key.tun_flags & TUNNEL_NOCACHE)
226 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
229 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
234 int ip_tunnel_init(struct net_device *dev);
235 void ip_tunnel_uninit(struct net_device *dev);
236 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
237 struct net *ip_tunnel_get_link_net(const struct net_device *dev);
238 int ip_tunnel_get_iflink(const struct net_device *dev);
239 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
240 struct rtnl_link_ops *ops, char *devname);
242 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
244 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
245 const struct iphdr *tnl_params, const u8 protocol);
246 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
247 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
248 u8 *protocol, struct flowi4 *fl4);
249 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
250 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
252 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
253 struct rtnl_link_stats64 *tot);
254 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
255 int link, __be16 flags,
256 __be32 remote, __be32 local,
259 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
260 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
262 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
263 struct ip_tunnel_parm *p);
264 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
265 struct ip_tunnel_parm *p);
266 void ip_tunnel_setup(struct net_device *dev, int net_id);
267 int ip_tunnel_encap_setup(struct ip_tunnel *t,
268 struct ip_tunnel_encap *ipencap);
270 /* Extract dsfield from inner protocol */
271 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
272 const struct sk_buff *skb)
274 if (skb->protocol == htons(ETH_P_IP))
276 else if (skb->protocol == htons(ETH_P_IPV6))
277 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
282 /* Propogate ECN bits out */
283 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
284 const struct sk_buff *skb)
286 u8 inner = ip_tunnel_get_dsfield(iph, skb);
288 return INET_ECN_encapsulate(tos, inner);
291 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto,
293 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
294 __be32 src, __be32 dst, u8 proto,
295 u8 tos, u8 ttl, __be16 df, bool xnet);
296 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
299 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
301 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
304 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
306 u64_stats_update_begin(&tstats->syncp);
307 tstats->tx_bytes += pkt_len;
308 tstats->tx_packets++;
309 u64_stats_update_end(&tstats->syncp);
312 struct net_device_stats *err_stats = &dev->stats;
315 err_stats->tx_errors++;
316 err_stats->tx_aborted_errors++;
318 err_stats->tx_dropped++;
323 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
328 static inline void ip_tunnel_info_opts_get(void *to,
329 const struct ip_tunnel_info *info)
331 memcpy(to, info + 1, info->options_len);
334 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
335 const void *from, int len)
337 memcpy(ip_tunnel_info_opts(info), from, len);
338 info->options_len = len;
341 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
343 return (struct ip_tunnel_info *)lwtstate->data;
346 extern struct static_key ip_tunnel_metadata_cnt;
348 /* Returns > 0 if metadata should be collected */
349 static inline int ip_tunnel_collect_metadata(void)
351 return static_key_false(&ip_tunnel_metadata_cnt);
354 void __init ip_tunnel_core_init(void);
356 void ip_tunnel_need_metadata(void);
357 void ip_tunnel_unneed_metadata(void);
359 #else /* CONFIG_INET */
361 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
366 static inline void ip_tunnel_need_metadata(void)
370 static inline void ip_tunnel_unneed_metadata(void)
374 static inline void ip_tunnel_info_opts_get(void *to,
375 const struct ip_tunnel_info *info)
379 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
380 const void *from, int len)
382 info->options_len = 0;
385 #endif /* CONFIG_INET */
387 #endif /* __NET_IP_TUNNELS_H */