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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) | |
1dd144cf TG |
100 | #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) |
101 | #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) | |
102 | ||
103 | #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) | |
c5441932 PS |
104 | |
105 | struct tnl_ptk_info { | |
106 | __be16 flags; | |
107 | __be16 proto; | |
108 | __be32 key; | |
109 | __be32 seq; | |
110 | }; | |
111 | ||
112 | #define PACKET_RCVD 0 | |
113 | #define PACKET_REJECT 1 | |
114 | ||
6261d983 | 115 | #define IP_TNL_HASH_BITS 7 |
c5441932 PS |
116 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
117 | ||
118 | struct ip_tunnel_net { | |
c5441932 | 119 | struct net_device *fb_tunnel_dev; |
6261d983 | 120 | struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
c5441932 PS |
121 | }; |
122 | ||
a8c5f90f TH |
123 | struct ip_tunnel_encap_ops { |
124 | size_t (*encap_hlen)(struct ip_tunnel_encap *e); | |
125 | int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, | |
126 | u8 *protocol, struct flowi4 *fl4); | |
127 | }; | |
128 | ||
129 | #define MAX_IPTUN_ENCAP_OPS 8 | |
130 | ||
131 | extern const struct ip_tunnel_encap_ops __rcu * | |
132 | iptun_encaps[MAX_IPTUN_ENCAP_OPS]; | |
133 | ||
134 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, | |
135 | unsigned int num); | |
136 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, | |
137 | unsigned int num); | |
138 | ||
5243b6ac JG |
139 | #ifdef CONFIG_INET |
140 | ||
c5441932 PS |
141 | int ip_tunnel_init(struct net_device *dev); |
142 | void ip_tunnel_uninit(struct net_device *dev); | |
143 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
1728d4fa | 144 | struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
d3b6f614 ED |
145 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
146 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 147 | |
6c742e71 | 148 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); |
c5441932 PS |
149 | |
150 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 151 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 | 152 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
56328486 TH |
153 | int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
154 | u8 *protocol, struct flowi4 *fl4); | |
c5441932 PS |
155 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
156 | ||
157 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
158 | struct rtnl_link_stats64 *tot); | |
159 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
160 | int link, __be16 flags, | |
161 | __be32 remote, __be32 local, | |
162 | __be32 key); | |
163 | ||
164 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
165 | const struct tnl_ptk_info *tpi, bool log_ecn_error); | |
166 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
167 | struct ip_tunnel_parm *p); | |
168 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
169 | struct ip_tunnel_parm *p); | |
170 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
cf71d2bc | 171 | void ip_tunnel_dst_reset_all(struct ip_tunnel *t); |
56328486 TH |
172 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
173 | struct ip_tunnel_encap *ipencap); | |
c5441932 PS |
174 | |
175 | /* Extract dsfield from inner protocol */ | |
176 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
177 | const struct sk_buff *skb) | |
178 | { | |
179 | if (skb->protocol == htons(ETH_P_IP)) | |
180 | return iph->tos; | |
181 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
182 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
183 | else | |
184 | return 0; | |
185 | } | |
186 | ||
187 | /* Propogate ECN bits out */ | |
188 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
189 | const struct sk_buff *skb) | |
190 | { | |
191 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
192 | ||
193 | return INET_ECN_encapsulate(tos, inner); | |
194 | } | |
195 | ||
3d7b46cd | 196 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
aad88724 | 197 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
0e6fbc5b | 198 | __be32 src, __be32 dst, __u8 proto, |
963a88b3 | 199 | __u8 tos, __u8 ttl, __be16 df, bool xnet); |
0e6fbc5b | 200 | |
2d26f0a3 ED |
201 | struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, |
202 | int gso_type_mask); | |
203 | ||
0e6fbc5b PS |
204 | static inline void iptunnel_xmit_stats(int err, |
205 | struct net_device_stats *err_stats, | |
8f84985f | 206 | struct pcpu_sw_netstats __percpu *stats) |
c5441932 | 207 | { |
0e6fbc5b | 208 | if (err > 0) { |
8f84985f | 209 | struct pcpu_sw_netstats *tstats = this_cpu_ptr(stats); |
c5441932 | 210 | |
c5441932 | 211 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 212 | tstats->tx_bytes += err; |
c5441932 PS |
213 | tstats->tx_packets++; |
214 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
215 | } else if (err < 0) { |
216 | err_stats->tx_errors++; | |
217 | err_stats->tx_aborted_errors++; | |
c5441932 | 218 | } else { |
0e6fbc5b | 219 | err_stats->tx_dropped++; |
c5441932 PS |
220 | } |
221 | } | |
5243b6ac JG |
222 | |
223 | #endif /* CONFIG_INET */ | |
224 | ||
c5441932 | 225 | #endif /* __NET_IP_TUNNELS_H */ |