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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) | |
76 | ||
77 | struct tnl_ptk_info { | |
78 | __be16 flags; | |
79 | __be16 proto; | |
80 | __be32 key; | |
81 | __be32 seq; | |
82 | }; | |
83 | ||
84 | #define PACKET_RCVD 0 | |
85 | #define PACKET_REJECT 1 | |
86 | ||
87 | #define IP_TNL_HASH_BITS 10 | |
88 | #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) | |
89 | ||
90 | struct ip_tunnel_net { | |
91 | struct hlist_head *tunnels; | |
92 | struct net_device *fb_tunnel_dev; | |
93 | }; | |
94 | ||
95 | int ip_tunnel_init(struct net_device *dev); | |
96 | void ip_tunnel_uninit(struct net_device *dev); | |
97 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); | |
98 | int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, | |
99 | struct rtnl_link_ops *ops, char *devname); | |
100 | ||
101 | void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn); | |
102 | ||
103 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, | |
104 | const struct iphdr *tnl_params); | |
105 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); | |
106 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); | |
107 | ||
108 | struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, | |
109 | struct rtnl_link_stats64 *tot); | |
110 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
111 | int link, __be16 flags, | |
112 | __be32 remote, __be32 local, | |
113 | __be32 key); | |
114 | ||
115 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
116 | const struct tnl_ptk_info *tpi, bool log_ecn_error); | |
117 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
118 | struct ip_tunnel_parm *p); | |
119 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
120 | struct ip_tunnel_parm *p); | |
121 | void ip_tunnel_setup(struct net_device *dev, int net_id); | |
122 | ||
123 | /* Extract dsfield from inner protocol */ | |
124 | static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, | |
125 | const struct sk_buff *skb) | |
126 | { | |
127 | if (skb->protocol == htons(ETH_P_IP)) | |
128 | return iph->tos; | |
129 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
130 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
131 | else | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* Propogate ECN bits out */ | |
136 | static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, | |
137 | const struct sk_buff *skb) | |
138 | { | |
139 | u8 inner = ip_tunnel_get_dsfield(iph, skb); | |
140 | ||
141 | return INET_ECN_encapsulate(tos, inner); | |
142 | } | |
143 | ||
144 | static inline void tunnel_ip_select_ident(struct sk_buff *skb, | |
145 | const struct iphdr *old_iph, | |
146 | struct dst_entry *dst) | |
147 | { | |
148 | struct iphdr *iph = ip_hdr(skb); | |
149 | ||
150 | /* Use inner packet iph-id if possible. */ | |
151 | if (skb->protocol == htons(ETH_P_IP) && old_iph->id) | |
152 | iph->id = old_iph->id; | |
153 | else | |
154 | __ip_select_ident(iph, dst, | |
155 | (skb_shinfo(skb)->gso_segs ?: 1) - 1); | |
156 | } | |
157 | ||
158 | static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
159 | { | |
160 | int err; | |
161 | int pkt_len = skb->len - skb_transport_offset(skb); | |
162 | struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats); | |
163 | ||
164 | nf_reset(skb); | |
165 | ||
166 | err = ip_local_out(skb); | |
167 | if (likely(net_xmit_eval(err) == 0)) { | |
168 | u64_stats_update_begin(&tstats->syncp); | |
169 | tstats->tx_bytes += pkt_len; | |
170 | tstats->tx_packets++; | |
171 | u64_stats_update_end(&tstats->syncp); | |
172 | } else { | |
173 | dev->stats.tx_errors++; | |
174 | dev->stats.tx_aborted_errors++; | |
175 | } | |
176 | } | |
177 | #endif /* __NET_IP_TUNNELS_H */ |