1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef __LINUX_GRE_H 1 #ifndef __LINUX_GRE_H
3 #define __LINUX_GRE_H 2 #define __LINUX_GRE_H
4 3
5 #include <linux/skbuff.h> 4 #include <linux/skbuff.h>
6 #include <net/ip_tunnels.h> 5 #include <net/ip_tunnels.h>
7 6
8 struct gre_base_hdr { 7 struct gre_base_hdr {
9 __be16 flags; 8 __be16 flags;
10 __be16 protocol; 9 __be16 protocol;
11 } __packed; 10 } __packed;
12 11
13 struct gre_full_hdr { 12 struct gre_full_hdr {
14 struct gre_base_hdr fixed_header; 13 struct gre_base_hdr fixed_header;
15 __be16 csum; 14 __be16 csum;
16 __be16 reserved1; 15 __be16 reserved1;
17 __be32 key; 16 __be32 key;
18 __be32 seq; 17 __be32 seq;
19 } __packed; 18 } __packed;
20 #define GRE_HEADER_SECTION 4 19 #define GRE_HEADER_SECTION 4
21 20
22 #define GREPROTO_CISCO 0 21 #define GREPROTO_CISCO 0
23 #define GREPROTO_PPTP 1 22 #define GREPROTO_PPTP 1
24 #define GREPROTO_MAX 2 23 #define GREPROTO_MAX 2
25 #define GRE_IP_PROTO_MAX 2 24 #define GRE_IP_PROTO_MAX 2
26 25
27 struct gre_protocol { 26 struct gre_protocol {
28 int (*handler)(struct sk_buff *skb); 27 int (*handler)(struct sk_buff *skb);
29 void (*err_handler)(struct sk_buff *sk 28 void (*err_handler)(struct sk_buff *skb, u32 info);
30 }; 29 };
31 30
32 int gre_add_protocol(const struct gre_protocol 31 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
33 int gre_del_protocol(const struct gre_protocol 32 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
34 33
35 struct net_device *gretap_fb_dev_create(struct 34 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
36 u8 name 35 u8 name_assign_type);
37 int gre_parse_header(struct sk_buff *skb, stru 36 int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
38 bool *csum_err, __be16 pr 37 bool *csum_err, __be16 proto, int nhs);
39 38
40 static inline bool netif_is_gretap(const struc !! 39 static inline int gre_calc_hlen(__be16 o_flags)
41 { <<
42 return dev->rtnl_link_ops && <<
43 !strcmp(dev->rtnl_link_ops->kin <<
44 } <<
45 <<
46 static inline bool netif_is_ip6gretap(const st <<
47 { <<
48 return dev->rtnl_link_ops && <<
49 !strcmp(dev->rtnl_link_ops->kin <<
50 } <<
51 <<
52 static inline int gre_calc_hlen(const unsigned <<
53 { 40 {
54 int addend = 4; 41 int addend = 4;
55 42
56 if (test_bit(IP_TUNNEL_CSUM_BIT, o_fla !! 43 if (o_flags & TUNNEL_CSUM)
57 addend += 4; 44 addend += 4;
58 if (test_bit(IP_TUNNEL_KEY_BIT, o_flag !! 45 if (o_flags & TUNNEL_KEY)
59 addend += 4; 46 addend += 4;
60 if (test_bit(IP_TUNNEL_SEQ_BIT, o_flag !! 47 if (o_flags & TUNNEL_SEQ)
61 addend += 4; 48 addend += 4;
62 return addend; 49 return addend;
63 } 50 }
64 51
65 static inline void gre_flags_to_tnl_flags(unsi !! 52 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
66 { 53 {
67 IP_TUNNEL_DECLARE_FLAGS(res) = { }; !! 54 __be16 tflags = 0;
68 55
69 __assign_bit(IP_TUNNEL_CSUM_BIT, res, !! 56 if (flags & GRE_CSUM)
70 __assign_bit(IP_TUNNEL_ROUTING_BIT, re !! 57 tflags |= TUNNEL_CSUM;
71 __assign_bit(IP_TUNNEL_KEY_BIT, res, f !! 58 if (flags & GRE_ROUTING)
72 __assign_bit(IP_TUNNEL_SEQ_BIT, res, f !! 59 tflags |= TUNNEL_ROUTING;
73 __assign_bit(IP_TUNNEL_STRICT_BIT, res !! 60 if (flags & GRE_KEY)
74 __assign_bit(IP_TUNNEL_REC_BIT, res, f !! 61 tflags |= TUNNEL_KEY;
75 __assign_bit(IP_TUNNEL_VERSION_BIT, re !! 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;
76 70
77 ip_tunnel_flags_copy(dst, res); !! 71 return tflags;
78 } 72 }
79 73
80 static inline __be16 gre_tnl_flags_to_gre_flag !! 74 static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
81 { 75 {
82 __be16 flags = 0; 76 __be16 flags = 0;
83 77
84 if (test_bit(IP_TUNNEL_CSUM_BIT, tflag !! 78 if (tflags & TUNNEL_CSUM)
85 flags |= GRE_CSUM; 79 flags |= GRE_CSUM;
86 if (test_bit(IP_TUNNEL_ROUTING_BIT, tf !! 80 if (tflags & TUNNEL_ROUTING)
87 flags |= GRE_ROUTING; 81 flags |= GRE_ROUTING;
88 if (test_bit(IP_TUNNEL_KEY_BIT, tflags !! 82 if (tflags & TUNNEL_KEY)
89 flags |= GRE_KEY; 83 flags |= GRE_KEY;
90 if (test_bit(IP_TUNNEL_SEQ_BIT, tflags !! 84 if (tflags & TUNNEL_SEQ)
91 flags |= GRE_SEQ; 85 flags |= GRE_SEQ;
92 if (test_bit(IP_TUNNEL_STRICT_BIT, tfl !! 86 if (tflags & TUNNEL_STRICT)
93 flags |= GRE_STRICT; 87 flags |= GRE_STRICT;
94 if (test_bit(IP_TUNNEL_REC_BIT, tflags !! 88 if (tflags & TUNNEL_REC)
95 flags |= GRE_REC; 89 flags |= GRE_REC;
96 if (test_bit(IP_TUNNEL_VERSION_BIT, tf !! 90 if (tflags & TUNNEL_VERSION)
97 flags |= GRE_VERSION; 91 flags |= GRE_VERSION;
98 92
99 return flags; 93 return flags;
100 } 94 }
101 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
102 static inline void gre_build_header(struct sk_ 107 static inline void gre_build_header(struct sk_buff *skb, int hdr_len,
103 const unsi !! 108 __be16 flags, __be16 proto,
104 __be32 key 109 __be32 key, __be32 seq)
105 { 110 {
106 IP_TUNNEL_DECLARE_FLAGS(cond) = { }; <<
107 struct gre_base_hdr *greh; 111 struct gre_base_hdr *greh;
108 112
109 skb_push(skb, hdr_len); 113 skb_push(skb, hdr_len);
110 114
111 skb_set_inner_protocol(skb, proto); 115 skb_set_inner_protocol(skb, proto);
112 skb_reset_transport_header(skb); 116 skb_reset_transport_header(skb);
113 greh = (struct gre_base_hdr *)skb->dat 117 greh = (struct gre_base_hdr *)skb->data;
114 greh->flags = gre_tnl_flags_to_gre_fla 118 greh->flags = gre_tnl_flags_to_gre_flags(flags);
115 greh->protocol = proto; 119 greh->protocol = proto;
116 120
117 __set_bit(IP_TUNNEL_KEY_BIT, cond); !! 121 if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
118 __set_bit(IP_TUNNEL_CSUM_BIT, cond); <<
119 __set_bit(IP_TUNNEL_SEQ_BIT, cond); <<
120 <<
121 if (ip_tunnel_flags_intersect(flags, c <<
122 __be32 *ptr = (__be32 *)(((u8 122 __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
123 123
124 if (test_bit(IP_TUNNEL_SEQ_BIT !! 124 if (flags & TUNNEL_SEQ) {
125 *ptr = seq; 125 *ptr = seq;
126 ptr--; 126 ptr--;
127 } 127 }
128 if (test_bit(IP_TUNNEL_KEY_BIT !! 128 if (flags & TUNNEL_KEY) {
129 *ptr = key; 129 *ptr = key;
130 ptr--; 130 ptr--;
131 } 131 }
132 if (test_bit(IP_TUNNEL_CSUM_BI !! 132 if (flags & TUNNEL_CSUM &&
133 !(skb_shinfo(skb)->gso_typ 133 !(skb_shinfo(skb)->gso_type &
134 (SKB_GSO_GRE | SKB_GSO_G 134 (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
135 *ptr = 0; 135 *ptr = 0;
136 if (skb->ip_summed == !! 136 *(__sum16 *)ptr = gre_checksum(skb);
137 *(__sum16 *)pt <<
138 } else { <<
139 skb->ip_summed <<
140 skb->csum_star <<
141 skb->csum_offs <<
142 } <<
143 } 137 }
144 } 138 }
145 } 139 }
146 140
147 #endif 141 #endif
148 142
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