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 
icmp6_hdr(const struct sk_buff * skb)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)
__icmpv6_send(struct sk_buff * skb,u8 type,u8 code,__u32 info,const struct inet6_skb_parm * parm)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 }
inet6_register_icmp_sender(ip6_icmp_send_t * fn)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 }
inet6_unregister_icmp_sender(ip6_icmp_send_t * fn)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 
icmpv6_send(struct sk_buff * skb,u8 type,u8 code,__u32 info)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
icmpv6_ndo_send(struct sk_buff * skb_in,u8 type,u8 code,__u32 info)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 
icmpv6_send(struct sk_buff * skb,u8 type,u8 code,__u32 info)67 static inline void icmpv6_send(struct sk_buff *skb,
68 			       u8 type, u8 code, __u32 info)
69 {
70 }
71 
icmpv6_ndo_send(struct sk_buff * skb,u8 type,u8 code,__u32 info)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 extern void				icmpv6_flow_init(struct sock *sk,
89 							 struct flowi6 *fl6,
90 							 u8 type,
91 							 const struct in6_addr *saddr,
92 							 const struct in6_addr *daddr,
93 							 int oif);
94 
icmpv6_param_prob(struct sk_buff * skb,u8 code,int pos)95 static inline void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
96 {
97 	icmpv6_param_prob_reason(skb, code, pos,
98 				 SKB_DROP_REASON_NOT_SPECIFIED);
99 }
100 
icmpv6_is_err(int type)101 static inline bool icmpv6_is_err(int type)
102 {
103 	switch (type) {
104 	case ICMPV6_DEST_UNREACH:
105 	case ICMPV6_PKT_TOOBIG:
106 	case ICMPV6_TIME_EXCEED:
107 	case ICMPV6_PARAMPROB:
108 		return true;
109 	}
110 
111 	return false;
112 }
113 
114 #endif
115