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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> | |
13 | #include <net/rtnetlink.h> | |
14 | ||
15 | #if IS_ENABLED(CONFIG_IPV6) | |
16 | #include <net/ipv6.h> | |
17 | #include <net/ip6_fib.h> | |
18 | #include <net/ip6_route.h> | |
19 | #endif | |
20 | ||
21 | /* Keep error state on tunnel for 30 sec */ | |
22 | #define IPTUNNEL_ERR_TIMEO (30*HZ) | |
23 | ||
24 | /* 6rd prefix/relay information */ | |
25 | #ifdef CONFIG_IPV6_SIT_6RD | |
26 | struct ip_tunnel_6rd_parm { | |
27 | struct in6_addr prefix; | |
28 | __be32 relay_prefix; | |
29 | u16 prefixlen; | |
30 | u16 relay_prefixlen; | |
31 | }; | |
32 | #endif | |
33 | ||
34 | struct ip_tunnel_prl_entry { | |
35 | struct ip_tunnel_prl_entry __rcu *next; | |
36 | __be32 addr; | |
37 | u16 flags; | |
38 | struct rcu_head rcu_head; | |
39 | }; | |
40 | ||
41 | struct ip_tunnel { | |
42 | struct ip_tunnel __rcu *next; | |
43 | struct hlist_node hash_node; | |
44 | struct net_device *dev; | |
45 | ||
46 | int err_count; /* Number of arrived ICMP errors */ | |
47 | unsigned long err_time; /* Time when the last ICMP error | |
48 | * arrived */ | |
49 | ||
50 | /* These four fields used only by GRE */ | |
51 | __u32 i_seqno; /* The last seen seqno */ | |
52 | __u32 o_seqno; /* The last output seqno */ | |
53 | int hlen; /* Precalculated header length */ | |
54 | int mlink; | |
55 | ||
56 | struct ip_tunnel_parm parms; | |
57 | ||
58 | /* for SIT */ | |
59 | #ifdef CONFIG_IPV6_SIT_6RD | |
60 | struct ip_tunnel_6rd_parm ip6rd; | |
61 | #endif | |
62 | struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ | |
63 | unsigned int prl_count; /* # of entries in PRL */ | |
64 | int ip_tnl_net_id; | |
65 | struct gro_cells gro_cells; | |
66 | }; | |
67 | ||
68 | #define TUNNEL_CSUM __cpu_to_be16(0x01) | |
69 | #define TUNNEL_ROUTING __cpu_to_be16(0x02) | |
70 | #define TUNNEL_KEY __cpu_to_be16(0x04) | |
71 | #define TUNNEL_SEQ __cpu_to_be16(0x08) | |
72 | #define TUNNEL_STRICT __cpu_to_be16(0x10) | |
73 | #define TUNNEL_REC __cpu_to_be16(0x20) | |
74 | #define TUNNEL_VERSION __cpu_to_be16(0x40) | |
75 | #define TUNNEL_NO_KEY __cpu_to_be16(0x80) | |
9a628224 | 76 | #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) |
c5441932 PS |
77 | |
78 | struct tnl_ptk_info { | |
79 | __be16 flags; | |
80 | __be16 proto; | |
81 | __be32 key; | |
82 | __be32 seq; | |
83 | }; | |
84 | ||
85 | #define PACKET_RCVD 0 | |
86 | #define PACKET_REJECT 1 | |
87 | ||
88 | #define IP_TNL_HASH_BITS 10 | |
89 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) | |
90 | ||
91 | struct ip_tunnel_net { | |
92 | struct hlist_head *tunnels; | |
93 | struct net_device *fb_tunnel_dev; | |
94 | }; | |
95 | ||
5243b6ac JG |
96 | #ifdef CONFIG_INET |
97 | ||
c5441932 PS |
98 | int ip_tunnel_init(struct net_device *dev); |
99 | void ip_tunnel_uninit(struct net_device *dev); | |
100 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
d3b6f614 ED |
101 | int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, |
102 | struct rtnl_link_ops *ops, char *devname); | |
c5441932 | 103 | |
d3b6f614 | 104 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn); |
c5441932 PS |
105 | |
106 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
bf3d6a8f | 107 | const struct iphdr *tnl_params, const u8 protocol); |
c5441932 PS |
108 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
109 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); | |
110 | ||
111 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
112 | struct rtnl_link_stats64 *tot); | |
113 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
114 | int link, __be16 flags, | |
115 | __be32 remote, __be32 local, | |
116 | __be32 key); | |
117 | ||
118 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
119 | const struct tnl_ptk_info *tpi, bool log_ecn_error); | |
120 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
121 | struct ip_tunnel_parm *p); | |
122 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
123 | struct ip_tunnel_parm *p); | |
124 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
125 | ||
126 | /* Extract dsfield from inner protocol */ | |
127 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
128 | const struct sk_buff *skb) | |
129 | { | |
130 | if (skb->protocol == htons(ETH_P_IP)) | |
131 | return iph->tos; | |
132 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
133 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
134 | else | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* Propogate ECN bits out */ | |
139 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
140 | const struct sk_buff *skb) | |
141 | { | |
142 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
143 | ||
144 | return INET_ECN_encapsulate(tos, inner); | |
145 | } | |
146 | ||
147 | static inline void tunnel_ip_select_ident(struct sk_buff *skb, | |
148 | const struct iphdr *old_iph, | |
149 | struct dst_entry *dst) | |
150 | { | |
151 | struct iphdr *iph = ip_hdr(skb); | |
152 | ||
153 | /* Use inner packet iph-id if possible. */ | |
154 | if (skb->protocol == htons(ETH_P_IP) && old_iph->id) | |
155 | iph->id = old_iph->id; | |
156 | else | |
157 | __ip_select_ident(iph, dst, | |
158 | (skb_shinfo(skb)->gso_segs ?: 1) - 1); | |
159 | } | |
160 | ||
3d7b46cd | 161 | int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); |
0e6fbc5b PS |
162 | int iptunnel_xmit(struct net *net, struct rtable *rt, |
163 | struct sk_buff *skb, | |
164 | __be32 src, __be32 dst, __u8 proto, | |
165 | __u8 tos, __u8 ttl, __be16 df); | |
166 | ||
167 | static inline void iptunnel_xmit_stats(int err, | |
168 | struct net_device_stats *err_stats, | |
169 | struct pcpu_tstats __percpu *stats) | |
c5441932 | 170 | { |
0e6fbc5b PS |
171 | if (err > 0) { |
172 | struct pcpu_tstats *tstats = this_cpu_ptr(stats); | |
c5441932 | 173 | |
c5441932 | 174 | u64_stats_update_begin(&tstats->syncp); |
0e6fbc5b | 175 | tstats->tx_bytes += err; |
c5441932 PS |
176 | tstats->tx_packets++; |
177 | u64_stats_update_end(&tstats->syncp); | |
0e6fbc5b PS |
178 | } else if (err < 0) { |
179 | err_stats->tx_errors++; | |
180 | err_stats->tx_aborted_errors++; | |
c5441932 | 181 | } else { |
0e6fbc5b | 182 | err_stats->tx_dropped++; |
c5441932 PS |
183 | } |
184 | } | |
5243b6ac JG |
185 | |
186 | #endif /* CONFIG_INET */ | |
187 | ||
c5441932 | 188 | #endif /* __NET_IP_TUNNELS_H */ |