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c5441932 PS |
1 | #ifndef __NET_IP_TUNNELS_H |
2 | #define __NET_IP_TUNNELS_H 1 | |
3 | ||
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/ip.h> | |
56328486 | 13 | #include <net/netns/generic.h> |
c5441932 PS |
14 | #include <net/rtnetlink.h> |
15 | ||
16 | #if IS_ENABLED(CONFIG_IPV6) | |
17 | #include <net/ipv6.h> | |
18 | #include <net/ip6_fib.h> | |
19 | #include <net/ip6_route.h> | |
20 | #endif | |
21 | ||
22 | /* Keep error state on tunnel for 30 sec */ | |
23 | #define IPTUNNEL_ERR_TIMEO (30*HZ) | |
24 | ||
25 | /* 6rd prefix/relay information */ | |
26 | #ifdef CONFIG_IPV6_SIT_6RD | |
27 | struct ip_tunnel_6rd_parm { | |
28 | struct in6_addr prefix; | |
29 | __be32 relay_prefix; | |
30 | u16 prefixlen; | |
31 | u16 relay_prefixlen; | |
32 | }; | |
33 | #endif | |
34 | ||
56328486 TH |
35 | struct ip_tunnel_encap { |
36 | __u16 type; | |
37 | __u16 flags; | |
38 | __be16 sport; | |
39 | __be16 dport; | |
40 | }; | |
41 | ||
c5441932 PS |
42 | struct ip_tunnel_prl_entry { |
43 | struct ip_tunnel_prl_entry __rcu *next; | |
44 | __be32 addr; | |
45 | u16 flags; | |
46 | struct rcu_head rcu_head; | |
47 | }; | |
48 | ||
9a4aa9af TH |
49 | struct ip_tunnel_dst { |
50 | struct dst_entry __rcu *dst; | |
95cb5745 | 51 | __be32 saddr; |
9a4aa9af TH |
52 | }; |
53 | ||
c5441932 PS |
54 | struct ip_tunnel { |
55 | struct ip_tunnel __rcu *next; | |
56 | struct hlist_node hash_node; | |
57 | struct net_device *dev; | |
5e6700b3 | 58 | struct net *net; /* netns for packet i/o */ |
c5441932 PS |
59 | |
60 | int err_count; /* Number of arrived ICMP errors */ | |
61 | unsigned long err_time; /* Time when the last ICMP error | |
62 | * arrived */ | |
63 | ||
64 | /* These four fields used only by GRE */ | |
65 | __u32 i_seqno; /* The last seen seqno */ | |
66 | __u32 o_seqno; /* The last output seqno */ | |
56328486 | 67 | int tun_hlen; /* Precalculated header length */ |
c5441932 PS |
68 | int mlink; |
69 | ||
9a4aa9af | 70 | struct ip_tunnel_dst __percpu *dst_cache; |
7d442fab | 71 | |
c5441932 PS |
72 | struct ip_tunnel_parm parms; |
73 | ||
56328486 TH |
74 | int encap_hlen; /* Encap header length (FOU,GUE) */ |
75 | struct ip_tunnel_encap encap; | |
76 | ||
77 | int hlen; /* tun_hlen + encap_hlen */ | |
78 | ||
c5441932 PS |
79 | /* for SIT */ |
80 | #ifdef CONFIG_IPV6_SIT_6RD | |
81 | struct ip_tunnel_6rd_parm ip6rd; | |
82 | #endif | |
83 | struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ | |
84 | unsigned int prl_count; /* # of entries in PRL */ | |
85 | int ip_tnl_net_id; | |
86 | struct gro_cells gro_cells; | |
87 | }; | |
88 | ||
f5796684 JG |
89 | #define TUNNEL_CSUM __cpu_to_be16(0x01) |
90 | #define TUNNEL_ROUTING __cpu_to_be16(0x02) | |
91 | #define TUNNEL_KEY __cpu_to_be16(0x04) | |
92 | #define TUNNEL_SEQ __cpu_to_be16(0x08) | |
93 | #define TUNNEL_STRICT __cpu_to_be16(0x10) | |
94 | #define TUNNEL_REC __cpu_to_be16(0x20) | |
95 | #define TUNNEL_VERSION __cpu_to_be16(0x40) | |
96 | #define TUNNEL_NO_KEY __cpu_to_be16(0x80) | |
9a628224 | 97 | #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) |
f5796684 JG |
98 | #define TUNNEL_OAM __cpu_to_be16(0x0200) |
99 | #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) | |
100 | #define TUNNEL_OPTIONS_PRESENT __cpu_to_be16(0x0800) | |
c5441932 PS |
101 | |
102 | struct tnl_ptk_info { | |
103 | __be16 flags; | |
104 | __be16 proto; | |
105 | __be32 key; | |
106 | __be32 seq; | |
107 | }; | |
108 | ||
109 | #define PACKET_RCVD 0 | |
110 | #define PACKET_REJECT 1 | |
111 | ||
6261d983 | 112 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
113 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
114 | ||
115 | struct ip_tunnel_net { | |
c5441932 | 116 | struct net_device *fb_tunnel_dev; |
6261d983 | 117 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
c5441932 PS |
118 | }; |
119 | ||
a8c5f90f TH |
120 | struct ip_tunnel_encap_ops { |
121 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
122 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
123 | u8 *protocol, struct flowi4 *fl4); | |
124 | }; | |
125 | ||
126 | #define MAX_IPTUN_ENCAP_OPS 8 | |
127 | ||
128 | extern const struct ip_tunnel_encap_ops __rcu * | |
129 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
130 | ||
131 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
132 | unsigned int num); | |
133 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
134 | unsigned int num); | |
135 | ||
5243b6ac JG |
136 | #ifdef CONFIG_INET |
137 | ||
c5441932 PS |
138 | int ip_tunnel_init(struct net_device *dev); |
139 | void ip_tunnel_uninit(struct net_device *dev); | |
140 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
d3b6f614 ED |
141 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
142 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 143 | |
6c742e71 | 144 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
145 | |
146 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 147 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 148 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
149 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
150 | u8 *protocol, struct flowi4 *fl4); | |
c5441932 PS |
151 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
152 | ||
153 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
154 | struct rtnl_link_stats64 *tot); | |
155 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
156 | int link, __be16 flags, | |
157 | __be32 remote, __be32 local, | |
158 | __be32 key); | |
159 | ||
160 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
161 | const struct tnl_ptk_info *tpi, bool log_ecn_error); | |
162 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
163 | struct ip_tunnel_parm *p); | |
164 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
165 | struct ip_tunnel_parm *p); | |
166 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
cf71d2bc | 167 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t); |
56328486 TH |
168 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
169 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
170 | |
171 | /* Extract dsfield from inner protocol */ | |
172 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
173 | const struct sk_buff *skb) | |
174 | { | |
175 | if (skb->protocol == htons(ETH_P_IP)) | |
176 | return iph->tos; | |
177 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
178 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
179 | else | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* Propogate ECN bits out */ | |
184 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
185 | const struct sk_buff *skb) | |
186 | { | |
187 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
188 | ||
189 | return INET_ECN_encapsulate(tos, inner); | |
190 | } | |
191 | ||
3d7b46cd | 192 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
aad88724 | 193 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
0e6fbc5b | 194 | __be32 src, __be32 dst, __u8 proto, |
963a88b3 | 195 | __u8 tos, __u8 ttl, __be16 df, bool xnet); |
0e6fbc5b | 196 | |
2d26f0a3 ED |
197 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, |
198 | int gso_type_mask); | |
199 | ||
0e6fbc5b PS |
200 | static inline void iptunnel_xmit_stats(int err, |
201 | struct net_device_stats *err_stats, | |
8f84985f | 202 | struct pcpu_sw_netstats __percpu *stats) |
c5441932 | 203 | { |
0e6fbc5b | 204 | if (err > 0) { |
8f84985f | 205 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); |
c5441932 | 206 | |
c5441932 | 207 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 208 | tstats->tx_bytes += err; |
c5441932 PS |
209 | tstats->tx_packets++; |
210 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
211 | } else if (err < 0) { |
212 | err_stats->tx_errors++; | |
213 | err_stats->tx_aborted_errors++; | |
c5441932 | 214 | } else { |
0e6fbc5b | 215 | err_stats->tx_dropped++; |
c5441932 PS |
216 | } |
217 | } | |
5243b6ac JG |
218 | |
219 | #endif /* CONFIG_INET */ | |
220 | ||
c5441932 | 221 | #endif /* __NET_IP_TUNNELS_H */ |