1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_GRE_H 2 #ifndef __LINUX_GRE_H
3 #define __LINUX_GRE_H 3 #define __LINUX_GRE_H
4 4
5 #include <linux/skbuff.h> 5 #include <linux/skbuff.h>
6 #include <net/ip_tunnels.h> 6 #include <net/ip_tunnels.h>
7 7
8 struct gre_base_hdr { 8 struct gre_base_hdr {
9 __be16 flags; 9 __be16 flags;
10 __be16 protocol; 10 __be16 protocol;
11 } __packed; 11 } __packed;
12 12
13 struct gre_full_hdr { 13 struct gre_full_hdr {
14 struct gre_base_hdr fixed_header; 14 struct gre_base_hdr fixed_header;
15 __be16 csum; 15 __be16 csum;
16 __be16 reserved1; 16 __be16 reserved1;
17 __be32 key; 17 __be32 key;
18 __be32 seq; 18 __be32 seq;
19 } __packed; 19 } __packed;
20 #define GRE_HEADER_SECTION 4 20 #define GRE_HEADER_SECTION 4
21 21
22 #define GREPROTO_CISCO 0 22 #define GREPROTO_CISCO 0
23 #define GREPROTO_PPTP 1 23 #define GREPROTO_PPTP 1
24 #define GREPROTO_MAX 2 24 #define GREPROTO_MAX 2
25 #define GRE_IP_PROTO_MAX 2 25 #define GRE_IP_PROTO_MAX 2
26 26
27 struct gre_protocol { 27 struct gre_protocol {
28 int (*handler)(struct sk_buff *skb); 28 int (*handler)(struct sk_buff *skb);
29 void (*err_handler)(struct sk_buff *sk 29 void (*err_handler)(struct sk_buff *skb, u32 info);
30 }; 30 };
31 31
32 int gre_add_protocol(const struct gre_protocol 32 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
33 int gre_del_protocol(const struct gre_protocol 33 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
34 34
35 struct net_device *gretap_fb_dev_create(struct 35 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
36 u8 name 36 u8 name_assign_type);
37 int gre_parse_header(struct sk_buff *skb, stru 37 int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
38 bool *csum_err, __be16 pr 38 bool *csum_err, __be16 proto, int nhs);
39 39
40 static inline bool netif_is_gretap(const struc 40 static inline bool netif_is_gretap(const struct net_device *dev)
41 { 41 {
42 return dev->rtnl_link_ops && 42 return dev->rtnl_link_ops &&
43 !strcmp(dev->rtnl_link_ops->kin 43 !strcmp(dev->rtnl_link_ops->kind, "gretap");
44 } 44 }
45 45
46 static inline bool netif_is_ip6gretap(const st 46 static inline bool netif_is_ip6gretap(const struct net_device *dev)
47 { 47 {
48 return dev->rtnl_link_ops && 48 return dev->rtnl_link_ops &&
49 !strcmp(dev->rtnl_link_ops->kin 49 !strcmp(dev->rtnl_link_ops->kind, "ip6gretap");
50 } 50 }
51 51
52 static inline int gre_calc_hlen(const unsigned !! 52 static inline int gre_calc_hlen(__be16 o_flags)
53 { 53 {
54 int addend = 4; 54 int addend = 4;
55 55
56 if (test_bit(IP_TUNNEL_CSUM_BIT, o_fla !! 56 if (o_flags & TUNNEL_CSUM)
57 addend += 4; 57 addend += 4;
58 if (test_bit(IP_TUNNEL_KEY_BIT, o_flag !! 58 if (o_flags & TUNNEL_KEY)
59 addend += 4; 59 addend += 4;
60 if (test_bit(IP_TUNNEL_SEQ_BIT, o_flag !! 60 if (o_flags & TUNNEL_SEQ)
61 addend += 4; 61 addend += 4;
62 return addend; 62 return addend;
63 } 63 }
64 64
65 static inline void gre_flags_to_tnl_flags(unsi !! 65 static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
66 { 66 {
67 IP_TUNNEL_DECLARE_FLAGS(res) = { }; !! 67 __be16 tflags = 0;
68 68
69 __assign_bit(IP_TUNNEL_CSUM_BIT, res, !! 69 if (flags & GRE_CSUM)
70 __assign_bit(IP_TUNNEL_ROUTING_BIT, re !! 70 tflags |= TUNNEL_CSUM;
71 __assign_bit(IP_TUNNEL_KEY_BIT, res, f !! 71 if (flags & GRE_ROUTING)
72 __assign_bit(IP_TUNNEL_SEQ_BIT, res, f !! 72 tflags |= TUNNEL_ROUTING;
73 __assign_bit(IP_TUNNEL_STRICT_BIT, res !! 73 if (flags & GRE_KEY)
74 __assign_bit(IP_TUNNEL_REC_BIT, res, f !! 74 tflags |= TUNNEL_KEY;
75 __assign_bit(IP_TUNNEL_VERSION_BIT, re !! 75 if (flags & GRE_SEQ)
>> 76 tflags |= TUNNEL_SEQ;
>> 77 if (flags & GRE_STRICT)
>> 78 tflags |= TUNNEL_STRICT;
>> 79 if (flags & GRE_REC)
>> 80 tflags |= TUNNEL_REC;
>> 81 if (flags & GRE_VERSION)
>> 82 tflags |= TUNNEL_VERSION;
76 83
77 ip_tunnel_flags_copy(dst, res); !! 84 return tflags;
78 } 85 }
79 86
80 static inline __be16 gre_tnl_flags_to_gre_flag !! 87 static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags)
81 { 88 {
82 __be16 flags = 0; 89 __be16 flags = 0;
83 90
84 if (test_bit(IP_TUNNEL_CSUM_BIT, tflag !! 91 if (tflags & TUNNEL_CSUM)
85 flags |= GRE_CSUM; 92 flags |= GRE_CSUM;
86 if (test_bit(IP_TUNNEL_ROUTING_BIT, tf !! 93 if (tflags & TUNNEL_ROUTING)
87 flags |= GRE_ROUTING; 94 flags |= GRE_ROUTING;
88 if (test_bit(IP_TUNNEL_KEY_BIT, tflags !! 95 if (tflags & TUNNEL_KEY)
89 flags |= GRE_KEY; 96 flags |= GRE_KEY;
90 if (test_bit(IP_TUNNEL_SEQ_BIT, tflags !! 97 if (tflags & TUNNEL_SEQ)
91 flags |= GRE_SEQ; 98 flags |= GRE_SEQ;
92 if (test_bit(IP_TUNNEL_STRICT_BIT, tfl !! 99 if (tflags & TUNNEL_STRICT)
93 flags |= GRE_STRICT; 100 flags |= GRE_STRICT;
94 if (test_bit(IP_TUNNEL_REC_BIT, tflags !! 101 if (tflags & TUNNEL_REC)
95 flags |= GRE_REC; 102 flags |= GRE_REC;
96 if (test_bit(IP_TUNNEL_VERSION_BIT, tf !! 103 if (tflags & TUNNEL_VERSION)
97 flags |= GRE_VERSION; 104 flags |= GRE_VERSION;
98 105
99 return flags; 106 return flags;
100 } 107 }
101 108
>> 109 static inline __sum16 gre_checksum(struct sk_buff *skb)
>> 110 {
>> 111 __wsum csum;
>> 112
>> 113 if (skb->ip_summed == CHECKSUM_PARTIAL)
>> 114 csum = lco_csum(skb);
>> 115 else
>> 116 csum = skb_checksum(skb, 0, skb->len, 0);
>> 117 return csum_fold(csum);
>> 118 }
>> 119
102 static inline void gre_build_header(struct sk_ 120 static inline void gre_build_header(struct sk_buff *skb, int hdr_len,
103 const unsi !! 121 __be16 flags, __be16 proto,
104 __be32 key 122 __be32 key, __be32 seq)
105 { 123 {
106 IP_TUNNEL_DECLARE_FLAGS(cond) = { }; <<
107 struct gre_base_hdr *greh; 124 struct gre_base_hdr *greh;
108 125
109 skb_push(skb, hdr_len); 126 skb_push(skb, hdr_len);
110 127
111 skb_set_inner_protocol(skb, proto); 128 skb_set_inner_protocol(skb, proto);
112 skb_reset_transport_header(skb); 129 skb_reset_transport_header(skb);
113 greh = (struct gre_base_hdr *)skb->dat 130 greh = (struct gre_base_hdr *)skb->data;
114 greh->flags = gre_tnl_flags_to_gre_fla 131 greh->flags = gre_tnl_flags_to_gre_flags(flags);
115 greh->protocol = proto; 132 greh->protocol = proto;
116 133
117 __set_bit(IP_TUNNEL_KEY_BIT, cond); !! 134 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 135 __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
123 136
124 if (test_bit(IP_TUNNEL_SEQ_BIT !! 137 if (flags & TUNNEL_SEQ) {
125 *ptr = seq; 138 *ptr = seq;
126 ptr--; 139 ptr--;
127 } 140 }
128 if (test_bit(IP_TUNNEL_KEY_BIT !! 141 if (flags & TUNNEL_KEY) {
129 *ptr = key; 142 *ptr = key;
130 ptr--; 143 ptr--;
131 } 144 }
132 if (test_bit(IP_TUNNEL_CSUM_BI !! 145 if (flags & TUNNEL_CSUM &&
133 !(skb_shinfo(skb)->gso_typ 146 !(skb_shinfo(skb)->gso_type &
134 (SKB_GSO_GRE | SKB_GSO_G 147 (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
135 *ptr = 0; 148 *ptr = 0;
136 if (skb->ip_summed == !! 149 *(__sum16 *)ptr = gre_checksum(skb);
137 *(__sum16 *)pt <<
138 } else { <<
139 skb->ip_summed <<
140 skb->csum_star <<
141 skb->csum_offs <<
142 } <<
143 } 150 }
144 } 151 }
145 } 152 }
146 153
147 #endif 154 #endif
148 155
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