1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_IP_TUNNELS_H
3 #define __NET_IP_TUNNELS_H 1
5 #include <linux/if_tunnel.h>
6 #include <linux/netdevice.h>
7 #include <linux/skbuff.h>
8 #include <linux/socket.h>
9 #include <linux/types.h>
10 #include <linux/u64_stats_sync.h>
11 #include <linux/bitops.h>
13 #include <net/dsfield.h>
14 #include <net/gro_cells.h>
15 #include <net/inet_ecn.h>
16 #include <net/netns/generic.h>
17 #include <net/rtnetlink.h>
18 #include <net/lwtunnel.h>
19 #include <net/dst_cache.h>
21 #if IS_ENABLED(CONFIG_IPV6)
23 #include <net/ip6_fib.h>
24 #include <net/ip6_route.h>
27 /* Keep error state on tunnel for 30 sec */
28 #define IPTUNNEL_ERR_TIMEO (30*HZ)
30 /* Used to memset ip_tunnel padding. */
31 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
33 /* Used to memset ipv4 address padding. */
34 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
35 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \
36 (sizeof_field(struct ip_tunnel_key, u) - \
37 sizeof_field(struct ip_tunnel_key, u.ipv4))
39 struct ip_tunnel_key
{
52 u8 tos
; /* TOS for IPv4, TC for IPv6 */
53 u8 ttl
; /* TTL for IPv4, HL for IPv6 */
54 __be32 label
; /* Flow Label for IPv6 */
59 /* Flags for ip_tunnel_info mode. */
60 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
61 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
62 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */
64 /* Maximum tunnel options length. */
65 #define IP_TUNNEL_OPTS_MAX \
66 GENMASK((sizeof_field(struct ip_tunnel_info, \
67 options_len) * BITS_PER_BYTE) - 1, 0)
69 struct ip_tunnel_info
{
70 struct ip_tunnel_key key
;
71 #ifdef CONFIG_DST_CACHE
72 struct dst_cache dst_cache
;
78 /* 6rd prefix/relay information */
79 #ifdef CONFIG_IPV6_SIT_6RD
80 struct ip_tunnel_6rd_parm
{
81 struct in6_addr prefix
;
88 struct ip_tunnel_encap
{
95 struct ip_tunnel_prl_entry
{
96 struct ip_tunnel_prl_entry __rcu
*next
;
99 struct rcu_head rcu_head
;
105 struct ip_tunnel __rcu
*next
;
106 struct hlist_node hash_node
;
107 struct net_device
*dev
;
108 struct net
*net
; /* netns for packet i/o */
110 unsigned long err_time
; /* Time when the last ICMP error
112 int err_count
; /* Number of arrived ICMP errors */
114 /* These four fields used only by GRE */
115 u32 i_seqno
; /* The last seen seqno */
116 u32 o_seqno
; /* The last output seqno */
117 int tun_hlen
; /* Precalculated header length */
119 /* These four fields used only by ERSPAN */
120 u32 index
; /* ERSPAN type II index */
121 u8 erspan_ver
; /* ERSPAN version */
122 u8 dir
; /* ERSPAN direction */
123 u16 hwid
; /* ERSPAN hardware ID */
125 struct dst_cache dst_cache
;
127 struct ip_tunnel_parm parms
;
130 int encap_hlen
; /* Encap header length (FOU,GUE) */
131 int hlen
; /* tun_hlen + encap_hlen */
132 struct ip_tunnel_encap encap
;
135 #ifdef CONFIG_IPV6_SIT_6RD
136 struct ip_tunnel_6rd_parm ip6rd
;
138 struct ip_tunnel_prl_entry __rcu
*prl
; /* potential router list */
139 unsigned int prl_count
; /* # of entries in PRL */
140 unsigned int ip_tnl_net_id
;
141 struct gro_cells gro_cells
;
147 struct tnl_ptk_info
{
155 #define PACKET_RCVD 0
156 #define PACKET_REJECT 1
157 #define PACKET_NEXT 2
159 #define IP_TNL_HASH_BITS 7
160 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
162 struct ip_tunnel_net
{
163 struct net_device
*fb_tunnel_dev
;
164 struct rtnl_link_ops
*rtnl_link_ops
;
165 struct hlist_head tunnels
[IP_TNL_HASH_SIZE
];
166 struct ip_tunnel __rcu
*collect_md_tun
;
170 static inline void ip_tunnel_key_init(struct ip_tunnel_key
*key
,
171 __be32 saddr
, __be32 daddr
,
172 u8 tos
, u8 ttl
, __be32 label
,
173 __be16 tp_src
, __be16 tp_dst
,
174 __be64 tun_id
, __be16 tun_flags
)
176 key
->tun_id
= tun_id
;
177 key
->u
.ipv4
.src
= saddr
;
178 key
->u
.ipv4
.dst
= daddr
;
179 memset((unsigned char *)key
+ IP_TUNNEL_KEY_IPV4_PAD
,
180 0, IP_TUNNEL_KEY_IPV4_PAD_LEN
);
184 key
->tun_flags
= tun_flags
;
186 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
187 * the upper tunnel are used.
188 * E.g: GRE over IPSEC, the tp_src and tp_port are zero.
190 key
->tp_src
= tp_src
;
191 key
->tp_dst
= tp_dst
;
193 /* Clear struct padding. */
194 if (sizeof(*key
) != IP_TUNNEL_KEY_SIZE
)
195 memset((unsigned char *)key
+ IP_TUNNEL_KEY_SIZE
,
196 0, sizeof(*key
) - IP_TUNNEL_KEY_SIZE
);
200 ip_tunnel_dst_cache_usable(const struct sk_buff
*skb
,
201 const struct ip_tunnel_info
*info
)
207 if (info
->key
.tun_flags
& TUNNEL_NOCACHE
)
213 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
216 return tun_info
->mode
& IP_TUNNEL_INFO_IPV6
? AF_INET6
: AF_INET
;
219 static inline __be64
key32_to_tunnel_id(__be32 key
)
222 return (__force __be64
)key
;
224 return (__force __be64
)((__force u64
)key
<< 32);
228 /* Returns the least-significant 32 bits of a __be64. */
229 static inline __be32
tunnel_id_to_key32(__be64 tun_id
)
232 return (__force __be32
)tun_id
;
234 return (__force __be32
)((__force u64
)tun_id
>> 32);
240 static inline void ip_tunnel_init_flow(struct flowi4
*fl4
,
242 __be32 daddr
, __be32 saddr
,
243 __be32 key
, __u8 tos
, int oif
,
244 __u32 mark
, __u32 tun_inner_hash
)
246 memset(fl4
, 0, sizeof(*fl4
));
247 fl4
->flowi4_oif
= oif
;
250 fl4
->flowi4_tos
= tos
;
251 fl4
->flowi4_proto
= proto
;
252 fl4
->fl4_gre_key
= key
;
253 fl4
->flowi4_mark
= mark
;
254 fl4
->flowi4_multipath_hash
= tun_inner_hash
;
257 int ip_tunnel_init(struct net_device
*dev
);
258 void ip_tunnel_uninit(struct net_device
*dev
);
259 void ip_tunnel_dellink(struct net_device
*dev
, struct list_head
*head
);
260 struct net
*ip_tunnel_get_link_net(const struct net_device
*dev
);
261 int ip_tunnel_get_iflink(const struct net_device
*dev
);
262 int ip_tunnel_init_net(struct net
*net
, unsigned int ip_tnl_net_id
,
263 struct rtnl_link_ops
*ops
, char *devname
);
265 void ip_tunnel_delete_nets(struct list_head
*list_net
, unsigned int id
,
266 struct rtnl_link_ops
*ops
);
268 void ip_tunnel_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
269 const struct iphdr
*tnl_params
, const u8 protocol
);
270 void ip_md_tunnel_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
271 const u8 proto
, int tunnel_hlen
);
272 int ip_tunnel_ctl(struct net_device
*dev
, struct ip_tunnel_parm
*p
, int cmd
);
273 int ip_tunnel_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
);
274 int __ip_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
, bool strict
);
275 int ip_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
);
277 struct ip_tunnel
*ip_tunnel_lookup(struct ip_tunnel_net
*itn
,
278 int link
, __be16 flags
,
279 __be32 remote
, __be32 local
,
282 int ip_tunnel_rcv(struct ip_tunnel
*tunnel
, struct sk_buff
*skb
,
283 const struct tnl_ptk_info
*tpi
, struct metadata_dst
*tun_dst
,
285 int ip_tunnel_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
286 struct ip_tunnel_parm
*p
, __u32 fwmark
);
287 int ip_tunnel_newlink(struct net_device
*dev
, struct nlattr
*tb
[],
288 struct ip_tunnel_parm
*p
, __u32 fwmark
);
289 void ip_tunnel_setup(struct net_device
*dev
, unsigned int net_id
);
291 extern const struct header_ops ip_tunnel_header_ops
;
292 __be16
ip_tunnel_parse_protocol(const struct sk_buff
*skb
);
294 struct ip_tunnel_encap_ops
{
295 size_t (*encap_hlen
)(struct ip_tunnel_encap
*e
);
296 int (*build_header
)(struct sk_buff
*skb
, struct ip_tunnel_encap
*e
,
297 u8
*protocol
, struct flowi4
*fl4
);
298 int (*err_handler
)(struct sk_buff
*skb
, u32 info
);
301 #define MAX_IPTUN_ENCAP_OPS 8
303 extern const struct ip_tunnel_encap_ops __rcu
*
304 iptun_encaps
[MAX_IPTUN_ENCAP_OPS
];
306 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops
*op
,
308 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops
*op
,
311 int ip_tunnel_encap_setup(struct ip_tunnel
*t
,
312 struct ip_tunnel_encap
*ipencap
);
314 static inline bool pskb_inet_may_pull(struct sk_buff
*skb
)
318 switch (skb
->protocol
) {
319 #if IS_ENABLED(CONFIG_IPV6)
320 case htons(ETH_P_IPV6
):
321 nhlen
= sizeof(struct ipv6hdr
);
324 case htons(ETH_P_IP
):
325 nhlen
= sizeof(struct iphdr
);
331 return pskb_network_may_pull(skb
, nhlen
);
334 static inline int ip_encap_hlen(struct ip_tunnel_encap
*e
)
336 const struct ip_tunnel_encap_ops
*ops
;
339 if (e
->type
== TUNNEL_ENCAP_NONE
)
342 if (e
->type
>= MAX_IPTUN_ENCAP_OPS
)
346 ops
= rcu_dereference(iptun_encaps
[e
->type
]);
347 if (likely(ops
&& ops
->encap_hlen
))
348 hlen
= ops
->encap_hlen(e
);
354 static inline int ip_tunnel_encap(struct sk_buff
*skb
, struct ip_tunnel
*t
,
355 u8
*protocol
, struct flowi4
*fl4
)
357 const struct ip_tunnel_encap_ops
*ops
;
360 if (t
->encap
.type
== TUNNEL_ENCAP_NONE
)
363 if (t
->encap
.type
>= MAX_IPTUN_ENCAP_OPS
)
367 ops
= rcu_dereference(iptun_encaps
[t
->encap
.type
]);
368 if (likely(ops
&& ops
->build_header
))
369 ret
= ops
->build_header(skb
, &t
->encap
, protocol
, fl4
);
375 /* Extract dsfield from inner protocol */
376 static inline u8
ip_tunnel_get_dsfield(const struct iphdr
*iph
,
377 const struct sk_buff
*skb
)
379 if (skb
->protocol
== htons(ETH_P_IP
))
381 else if (skb
->protocol
== htons(ETH_P_IPV6
))
382 return ipv6_get_dsfield((const struct ipv6hdr
*)iph
);
387 static inline u8
ip_tunnel_get_ttl(const struct iphdr
*iph
,
388 const struct sk_buff
*skb
)
390 if (skb
->protocol
== htons(ETH_P_IP
))
392 else if (skb
->protocol
== htons(ETH_P_IPV6
))
393 return ((const struct ipv6hdr
*)iph
)->hop_limit
;
398 /* Propogate ECN bits out */
399 static inline u8
ip_tunnel_ecn_encap(u8 tos
, const struct iphdr
*iph
,
400 const struct sk_buff
*skb
)
402 u8 inner
= ip_tunnel_get_dsfield(iph
, skb
);
404 return INET_ECN_encapsulate(tos
, inner
);
407 int __iptunnel_pull_header(struct sk_buff
*skb
, int hdr_len
,
408 __be16 inner_proto
, bool raw_proto
, bool xnet
);
410 static inline int iptunnel_pull_header(struct sk_buff
*skb
, int hdr_len
,
411 __be16 inner_proto
, bool xnet
)
413 return __iptunnel_pull_header(skb
, hdr_len
, inner_proto
, false, xnet
);
416 void iptunnel_xmit(struct sock
*sk
, struct rtable
*rt
, struct sk_buff
*skb
,
417 __be32 src
, __be32 dst
, u8 proto
,
418 u8 tos
, u8 ttl
, __be16 df
, bool xnet
);
419 struct metadata_dst
*iptunnel_metadata_reply(struct metadata_dst
*md
,
421 int skb_tunnel_check_pmtu(struct sk_buff
*skb
, struct dst_entry
*encap_dst
,
422 int headroom
, bool reply
);
424 int iptunnel_handle_offloads(struct sk_buff
*skb
, int gso_type_mask
);
426 static inline int iptunnel_pull_offloads(struct sk_buff
*skb
)
428 if (skb_is_gso(skb
)) {
431 err
= skb_unclone(skb
, GFP_ATOMIC
);
434 skb_shinfo(skb
)->gso_type
&= ~(NETIF_F_GSO_ENCAP_ALL
>>
438 skb
->encapsulation
= 0;
442 static inline void iptunnel_xmit_stats(struct net_device
*dev
, int pkt_len
)
445 struct pcpu_sw_netstats
*tstats
= get_cpu_ptr(dev
->tstats
);
447 u64_stats_update_begin(&tstats
->syncp
);
448 tstats
->tx_bytes
+= pkt_len
;
449 tstats
->tx_packets
++;
450 u64_stats_update_end(&tstats
->syncp
);
453 struct net_device_stats
*err_stats
= &dev
->stats
;
456 err_stats
->tx_errors
++;
457 err_stats
->tx_aborted_errors
++;
459 err_stats
->tx_dropped
++;
464 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info
*info
)
469 static inline void ip_tunnel_info_opts_get(void *to
,
470 const struct ip_tunnel_info
*info
)
472 memcpy(to
, info
+ 1, info
->options_len
);
475 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info
*info
,
476 const void *from
, int len
,
479 info
->options_len
= len
;
481 memcpy(ip_tunnel_info_opts(info
), from
, len
);
482 info
->key
.tun_flags
|= flags
;
486 static inline struct ip_tunnel_info
*lwt_tun_info(struct lwtunnel_state
*lwtstate
)
488 return (struct ip_tunnel_info
*)lwtstate
->data
;
491 DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt
);
493 /* Returns > 0 if metadata should be collected */
494 static inline int ip_tunnel_collect_metadata(void)
496 return static_branch_unlikely(&ip_tunnel_metadata_cnt
);
499 void __init
ip_tunnel_core_init(void);
501 void ip_tunnel_need_metadata(void);
502 void ip_tunnel_unneed_metadata(void);
504 #else /* CONFIG_INET */
506 static inline struct ip_tunnel_info
*lwt_tun_info(struct lwtunnel_state
*lwtstate
)
511 static inline void ip_tunnel_need_metadata(void)
515 static inline void ip_tunnel_unneed_metadata(void)
519 static inline void ip_tunnel_info_opts_get(void *to
,
520 const struct ip_tunnel_info
*info
)
524 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info
*info
,
525 const void *from
, int len
,
528 info
->options_len
= 0;
531 #endif /* CONFIG_INET */
533 #endif /* __NET_IP_TUNNELS_H */