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TOMOYO Linux Cross Reference
Linux/include/net/gre.h

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  1 #ifndef __LINUX_GRE_H
  2 #define __LINUX_GRE_H
  3 
  4 #include <linux/skbuff.h>
  5 #include <net/ip_tunnels.h>
  6 
  7 struct gre_base_hdr {
  8         __be16 flags;
  9         __be16 protocol;
 10 } __packed;
 11 
 12 struct gre_full_hdr {
 13         struct gre_base_hdr fixed_header;
 14         __be16 csum;
 15         __be16 reserved1;
 16         __be32 key;
 17         __be32 seq;
 18 } __packed;
 19 #define GRE_HEADER_SECTION 4
 20 
 21 #define GREPROTO_CISCO          0
 22 #define GREPROTO_PPTP           1
 23 #define GREPROTO_MAX            2
 24 #define GRE_IP_PROTO_MAX        2
 25 
 26 struct gre_protocol {
 27         int  (*handler)(struct sk_buff *skb);
 28         void (*err_handler)(struct sk_buff *skb, u32 info);
 29 };
 30 
 31 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
 32 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
 33 
 34 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
 35                                        u8 name_assign_type);
 36 int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 37                      bool *csum_err, __be16 proto, int nhs);
 38 
 39 static inline int gre_calc_hlen(__be16 o_flags)
 40 {
 41         int addend = 4;
 42 
 43         if (o_flags & TUNNEL_CSUM)
 44                 addend += 4;
 45         if (o_flags & TUNNEL_KEY)
 46                 addend += 4;
 47         if (o_flags & TUNNEL_SEQ)
 48                 addend += 4;
 49         return addend;
 50 }
 51 
 52 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
 53 {
 54         __be16 tflags = 0;
 55 
 56         if (flags & GRE_CSUM)
 57                 tflags |= TUNNEL_CSUM;
 58         if (flags & GRE_ROUTING)
 59                 tflags |= TUNNEL_ROUTING;
 60         if (flags & GRE_KEY)
 61                 tflags |= TUNNEL_KEY;
 62         if (flags & GRE_SEQ)
 63                 tflags |= TUNNEL_SEQ;
 64         if (flags & GRE_STRICT)
 65                 tflags |= TUNNEL_STRICT;
 66         if (flags & GRE_REC)
 67                 tflags |= TUNNEL_REC;
 68         if (flags & GRE_VERSION)
 69                 tflags |= TUNNEL_VERSION;
 70 
 71         return tflags;
 72 }
 73 
 74 static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
 75 {
 76         __be16 flags = 0;
 77 
 78         if (tflags & TUNNEL_CSUM)
 79                 flags |= GRE_CSUM;
 80         if (tflags & TUNNEL_ROUTING)
 81                 flags |= GRE_ROUTING;
 82         if (tflags & TUNNEL_KEY)
 83                 flags |= GRE_KEY;
 84         if (tflags & TUNNEL_SEQ)
 85                 flags |= GRE_SEQ;
 86         if (tflags & TUNNEL_STRICT)
 87                 flags |= GRE_STRICT;
 88         if (tflags & TUNNEL_REC)
 89                 flags |= GRE_REC;
 90         if (tflags & TUNNEL_VERSION)
 91                 flags |= GRE_VERSION;
 92 
 93         return flags;
 94 }
 95 
 96 static inline __sum16 gre_checksum(struct sk_buff *skb)
 97 {
 98         __wsum csum;
 99 
100         if (skb->ip_summed == CHECKSUM_PARTIAL)
101                 csum = lco_csum(skb);
102         else
103                 csum = skb_checksum(skb, 0, skb->len, 0);
104         return csum_fold(csum);
105 }
106 
107 static inline void gre_build_header(struct sk_buff *skb, int hdr_len,
108                                     __be16 flags, __be16 proto,
109                                     __be32 key, __be32 seq)
110 {
111         struct gre_base_hdr *greh;
112 
113         skb_push(skb, hdr_len);
114 
115         skb_set_inner_protocol(skb, proto);
116         skb_reset_transport_header(skb);
117         greh = (struct gre_base_hdr *)skb->data;
118         greh->flags = gre_tnl_flags_to_gre_flags(flags);
119         greh->protocol = proto;
120 
121         if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
122                 __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
123 
124                 if (flags & TUNNEL_SEQ) {
125                         *ptr = seq;
126                         ptr--;
127                 }
128                 if (flags & TUNNEL_KEY) {
129                         *ptr = key;
130                         ptr--;
131                 }
132                 if (flags & TUNNEL_CSUM &&
133                     !(skb_shinfo(skb)->gso_type &
134                       (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
135                         *ptr = 0;
136                         *(__sum16 *)ptr = gre_checksum(skb);
137                 }
138         }
139 }
140 
141 #endif
142 

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