1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_ICMPV6_H
3 #define _LINUX_ICMPV6_H
4
5 #include <linux/skbuff.h>
6 #include <linux/ipv6.h>
7 #include <uapi/linux/icmpv6.h>
8
9 static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
10 {
11 return (struct icmp6hdr *)skb_transport_header(skb);
12 }
13
14 #include <linux/netdevice.h>
15
16 #if IS_ENABLED(CONFIG_IPV6)
17
18 typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info,
19 const struct in6_addr *force_saddr,
20 const struct inet6_skb_parm *parm);
21 void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
22 const struct in6_addr *force_saddr,
23 const struct inet6_skb_parm *parm);
24 #if IS_BUILTIN(CONFIG_IPV6)
25 static inline void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
26 const struct inet6_skb_parm *parm)
27 {
28 icmp6_send(skb, type, code, info, NULL, parm);
29 }
30 static inline int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
31 {
32 BUILD_BUG_ON(fn != icmp6_send);
33 return 0;
34 }
35 static inline int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
36 {
37 BUILD_BUG_ON(fn != icmp6_send);
38 return 0;
39 }
40 #else
41 extern void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
42 const struct inet6_skb_parm *parm);
43 extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
44 extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
45 #endif
46
47 static inline void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
48 {
49 __icmpv6_send(skb, type, code, info, IP6CB(skb));
50 }
51
52 int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
53 unsigned int data_len);
54
55 #if IS_ENABLED(CONFIG_NF_NAT)
56 void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info);
57 #else
58 static inline void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info)
59 {
60 struct inet6_skb_parm parm = { 0 };
61 __icmpv6_send(skb_in, type, code, info, &parm);
62 }
63 #endif
64
65 #else
66
67 static inline void icmpv6_send(struct sk_buff *skb,
68 u8 type, u8 code, __u32 info)
69 {
70 }
71
72 static inline void icmpv6_ndo_send(struct sk_buff *skb,
73 u8 type, u8 code, __u32 info)
74 {
75 }
76 #endif
77
78 extern int icmpv6_init(void);
79 extern int icmpv6_err_convert(u8 type, u8 code,
80 int *err);
81 extern void icmpv6_cleanup(void);
82 extern void icmpv6_param_prob_reason(struct sk_buff *skb,
83 u8 code, int pos,
84 enum skb_drop_reason reason);
85
86 struct flowi6;
87 struct in6_addr;
88
89 void icmpv6_flow_init(const struct sock *sk, struct flowi6 *fl6, u8 type,
90 const struct in6_addr *saddr,
91 const struct in6_addr *daddr, int oif);
92
93 static inline void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
94 {
95 icmpv6_param_prob_reason(skb, code, pos,
96 SKB_DROP_REASON_NOT_SPECIFIED);
97 }
98
99 static inline bool icmpv6_is_err(int type)
100 {
101 switch (type) {
102 case ICMPV6_DEST_UNREACH:
103 case ICMPV6_PKT_TOOBIG:
104 case ICMPV6_TIME_EXCEED:
105 case ICMPV6_PARAMPROB:
106 return true;
107 }
108
109 return false;
110 }
111
112 #endif
113
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