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
9static 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
18typedef 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);
21void 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)
25static 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}
30static inline int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
31{
32 BUILD_BUG_ON(fn != icmp6_send);
33 return 0;
34}
35static 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
41extern void __icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
42 const struct inet6_skb_parm *parm);
43extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
44extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
45#endif
46
47static 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
52int 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)
56void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info);
57#else
58static 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
67static inline void icmpv6_send(struct sk_buff *skb,
68 u8 type, u8 code, __u32 info)
69{
70}
71
72static inline void icmpv6_ndo_send(struct sk_buff *skb,
73 u8 type, u8 code, __u32 info)
74{
75}
76#endif
77
78extern int icmpv6_init(void);
79extern int icmpv6_err_convert(u8 type, u8 code,
80 int *err);
81extern void icmpv6_cleanup(void);
82extern void icmpv6_param_prob_reason(struct sk_buff *skb,
83 u8 code, int pos,
84 enum skb_drop_reason reason);
85
86struct flowi6;
87struct in6_addr;
88
89void 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
93static inline void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
94{
95 icmpv6_param_prob_reason(skb, code, pos,
96 reason: SKB_DROP_REASON_NOT_SPECIFIED);
97}
98
99static 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