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192.168.1.100 / T108 / e958203796650e3959a43708d67534bf36f4c83b / . / marvell / linux / include / net / ip6_tunnel.h
blob: 6a334c0865072f7a069bff1081838aa2769534e6 [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_IP6_TUNNEL_H
3#define _NET_IP6_TUNNEL_H
4
5#include <linux/ipv6.h>
6#include <linux/netdevice.h>
7#include <linux/if_tunnel.h>
8#include <linux/ip6_tunnel.h>
9#include <net/ip_tunnels.h>
10#include <net/dst_cache.h>
11
12#define IP6TUNNEL_ERR_TIMEO (30*HZ)
13
14/* capable of sending packets */
15#define IP6_TNL_F_CAP_XMIT 0x10000
16/* capable of receiving packets */
17#define IP6_TNL_F_CAP_RCV 0x20000
18/* determine capability on a per-packet basis */
19#define IP6_TNL_F_CAP_PER_PACKET 0x40000
20
21/* IPv6 tunnel FMR */
22struct __ip6_tnl_fmr {
23 struct __ip6_tnl_fmr *next; /* next fmr in list */
24 struct in6_addr ip6_prefix;
25 struct in_addr ip4_prefix;
26
27 __u8 ip6_prefix_len;
28 __u8 ip4_prefix_len;
29 __u8 ea_len;
30 __u8 offset;
31};
32
33struct __ip6_tnl_parm {
34 char name[IFNAMSIZ]; /* name of tunnel device */
35 int link; /* ifindex of underlying L2 interface */
36 __u8 proto; /* tunnel protocol */
37 __u8 encap_limit; /* encapsulation limit for tunnel */
38 __u8 hop_limit; /* hop limit for tunnel */
39 bool collect_md;
40 __be32 flowinfo; /* traffic class and flowlabel for tunnel */
41 __u32 flags; /* tunnel flags */
42 struct in6_addr laddr; /* local tunnel end-point address */
43 struct in6_addr raddr; /* remote tunnel end-point address */
44 struct __ip6_tnl_fmr *fmrs; /* FMRs */
45
46 __be16 i_flags;
47 __be16 o_flags;
48 __be32 i_key;
49 __be32 o_key;
50
51 __u32 fwmark;
52 __u32 index; /* ERSPAN type II index */
53 __u8 erspan_ver; /* ERSPAN version */
54 __u8 dir; /* direction */
55 __u16 hwid; /* hwid */
56};
57
58/* IPv6 tunnel */
59struct ip6_tnl {
60 struct ip6_tnl __rcu *next; /* next tunnel in list */
61 struct net_device *dev; /* virtual device associated with tunnel */
62 struct net *net; /* netns for packet i/o */
63 struct __ip6_tnl_parm parms; /* tunnel configuration parameters */
64 struct flowi fl; /* flowi template for xmit */
65 struct dst_cache dst_cache; /* cached dst */
66 struct gro_cells gro_cells;
67
68 int err_count;
69 unsigned long err_time;
70
71 /* These fields used only by GRE */
72 __u32 i_seqno; /* The last seen seqno */
73 atomic_t o_seqno; /* The last output seqno */
74 int hlen; /* tun_hlen + encap_hlen */
75 int tun_hlen; /* Precalculated header length */
76 int encap_hlen; /* Encap header length (FOU,GUE) */
77 struct ip_tunnel_encap encap;
78 int mlink;
79};
80
81struct ip6_tnl_encap_ops {
82 size_t (*encap_hlen)(struct ip_tunnel_encap *e);
83 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
84 u8 *protocol, struct flowi6 *fl6);
85 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
86 u8 type, u8 code, int offset, __be32 info);
87};
88
89#ifdef CONFIG_INET
90
91extern const struct ip6_tnl_encap_ops __rcu *
92 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS];
93
94int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
95 unsigned int num);
96int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
97 unsigned int num);
98int ip6_tnl_encap_setup(struct ip6_tnl *t,
99 struct ip_tunnel_encap *ipencap);
100
101static inline int ip6_encap_hlen(struct ip_tunnel_encap *e)
102{
103 const struct ip6_tnl_encap_ops *ops;
104 int hlen = -EINVAL;
105
106 if (e->type == TUNNEL_ENCAP_NONE)
107 return 0;
108
109 if (e->type >= MAX_IPTUN_ENCAP_OPS)
110 return -EINVAL;
111
112 rcu_read_lock();
113 ops = rcu_dereference(ip6tun_encaps[e->type]);
114 if (likely(ops && ops->encap_hlen))
115 hlen = ops->encap_hlen(e);
116 rcu_read_unlock();
117
118 return hlen;
119}
120
121static inline int ip6_tnl_encap(struct sk_buff *skb, struct ip6_tnl *t,
122 u8 *protocol, struct flowi6 *fl6)
123{
124 const struct ip6_tnl_encap_ops *ops;
125 int ret = -EINVAL;
126
127 if (t->encap.type == TUNNEL_ENCAP_NONE)
128 return 0;
129
130 if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
131 return -EINVAL;
132
133 rcu_read_lock();
134 ops = rcu_dereference(ip6tun_encaps[t->encap.type]);
135 if (likely(ops && ops->build_header))
136 ret = ops->build_header(skb, &t->encap, protocol, fl6);
137 rcu_read_unlock();
138
139 return ret;
140}
141
142/* Tunnel encapsulation limit destination sub-option */
143
144struct ipv6_tlv_tnl_enc_lim {
145 __u8 type; /* type-code for option */
146 __u8 length; /* option length */
147 __u8 encap_limit; /* tunnel encapsulation limit */
148} __packed;
149
150int ip6_tnl_rcv_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
151 const struct in6_addr *raddr);
152int ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
153 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
154 bool log_ecn_error);
155int ip6_tnl_xmit_ctl(struct ip6_tnl *t, const struct in6_addr *laddr,
156 const struct in6_addr *raddr);
157int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
158 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, __u8 proto);
159__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw);
160__u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
161 const struct in6_addr *raddr);
162struct net *ip6_tnl_get_link_net(const struct net_device *dev);
163int ip6_tnl_get_iflink(const struct net_device *dev);
164int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
165
166static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
167 struct net_device *dev)
168{
169 int pkt_len, err;
170
171 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
172 pkt_len = skb->len - skb_inner_network_offset(skb);
173 err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
174
175 if (dev) {
176 if (unlikely(net_xmit_eval(err)))
177 pkt_len = -1;
178 iptunnel_xmit_stats(dev, pkt_len);
179 }
180}
181#endif
182#endif